Water source air conditioning system and control method, device and storage medium thereof

Abstract

The application discloses a water source air conditioning system control method and device, a water source air conditioning system and a storage medium. The method comprises the following steps: in a heating mode, at least one of the water inlet temperature and the water outlet temperature of a plate heat exchanger, the exhaust temperature and the exhaust superheat of a compressor, and the low-pressure temperature value of the water source air conditioning system is combined with the opening degree of a heating electronic expansion valve and the opening degree of a subcooler electronic expansion valve to realize at least one of the exhaust temperature overhigh protection of the compressor, the exhaust temperature overlow protection of the compressor, and the low-pressure overlow protection of the water source air conditioning system. According to the scheme, the water inlet temperature of the plate heat exchanger, the low-pressure temperature value of the unit, and the exhaust temperature and the exhaust superheat of the compressor are combined to realize the exhaust temperature overhigh and overlow protection of the compressor and the low-pressure overlow protection of the unit, and the reliability of the water source air conditioning system is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water source air conditioning systems, and particularly relates to a control method and device for a water source air conditioning system, the water source air conditioning system, and a storage medium. BACKGROUND

[0002] With the gradual deepening of the concept of safety and environmental protection, and with the progress of the combination of the water fluorine system, water source air conditioning systems (i.e., water source heat pump air conditioners) are increasingly popular among ordinary consumers. Water source heat pump technology can utilize low-level heat energy resources formed by absorbing solar energy and geothermal energy in the shallow surface of the earth, such as underground water, rivers, and lakes, and adopts the principle of heat pumps, i.e., through the input of a small amount of high-level heat energy, low-level heat energy that cannot be directly utilized is converted into high-level energy that can be utilized, so as to achieve the purpose of saving part of the high-level energy.

[0003] Compared with the related scheme in which the air conditioning unit uses a fin heat exchanger as the condenser of the unit to perform condensation heat exchange, the plate heat exchanger used by the water source air conditioning system not only has a smaller volume and saves space, but also can control the temperature of the incoming water, so that the temperature rise for heating can be completed faster at low temperatures, and the use cost is saved. The incoming water of the water source air conditioning system is cooled by a cooling tower in summer and is heated by a boiler in winter, so as to ensure that the operating load of the plate heat exchanger of the water source air conditioning system is not too large. If the water temperature and flow rate of the plate heat exchanger are both low when the water source air conditioning system is started in the heating mode, the water in the plate heat exchanger cannot be heat-exchanged with the refrigerant at this time, and there is a risk of freezing of the plate heat exchanger, so that the entire unit stops running.

[0004] The above content is only used to assist in understanding the technical solutions of the application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The application aims to provide a control method and device for a water source air conditioning system, the water source air conditioning system, and a storage medium, so as to solve the problem that when the water source air conditioning system is started in the heating mode, if the water temperature and flow rate of the plate heat exchanger are both low, the water heat exchange pipeline in the plate heat exchanger cannot be heat-exchanged with the refrigerant heat exchange pipeline, and once the water heat exchange pipeline in the plate heat exchanger freezes, the water source air conditioning system stops running, which affects the reliability of the operation of the water source air conditioning system, and to achieve the effect of ensuring the reliability of the operation of the water source air conditioning system by combining the water temperature of the plate heat exchanger, the low pressure temperature value of the unit, and the discharge temperature and discharge superheat of the compressor, realizing the protection of the discharge temperature of the compressor being too high and too low, and the protection of the low pressure of the unit being too low.

[0006] The application provides a control method of a water source air conditioning system, the water source air conditioning system comprising a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a supercooling device, a heating electronic expansion valve, a supercooling electronic expansion valve and a supercooling electromagnetic valve; the outdoor heat exchanger adopts a plate heat exchanger; wherein the exhaust port of the compressor is communicated to the fourth valve port of the four-way valve, the first valve port of the four-way valve is communicated to the first port of the indoor heat exchanger, the second port of the indoor heat exchanger is divided into two paths after the first refrigerant pipeline of the supercooling device, one path is communicated to the third valve port of the four-way valve after the refrigerant heat exchange pipeline of the heating electronic expansion valve and the plate heat exchanger, and the other path is communicated to the second valve port of the four-way valve after the bypass pipeline of the supercooling device, the supercooling electronic expansion valve, the second refrigerant pipeline of the supercooling device and the supercooling electromagnetic valve, and the other path is communicated to the suction port of the compressor; the control method of the water source air conditioning system comprises the following steps: acquiring the water inlet temperature of the plate heat exchanger when the water source air conditioning system operates in a heating mode; acquiring the water outlet temperature of the plate heat exchanger; acquiring the exhaust temperature of the compressor; acquiring the exhaust superheat degree of the compressor; and acquiring the low-pressure temperature value before the pipeline of the supercooling electromagnetic valve is divided into two paths as the low-pressure temperature value of the water source air conditioning system; and at least one of the water inlet temperature of the plate heat exchanger, the water outlet temperature of the plate heat exchanger, the exhaust temperature of the compressor, the exhaust superheat degree of the compressor and the low-pressure temperature value of the water source air conditioning system is combined with the opening degree of the heating electronic expansion valve and the opening degree of the supercooling electronic expansion valve to realize at least one of the exhaust temperature overhigh protection of the compressor, the exhaust temperature overlow protection of the compressor and the low-pressure overlow protection of the water source air conditioning system.

[0007] In some embodiments, in combination with the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve, at least one of the protection of the exhaust temperature of the compressor being too high, the protection of the exhaust temperature of the compressor being too low, and the protection of the low pressure of the water source air conditioning system being too low is realized according to at least one of the water inlet temperature of the plate heat exchanger, the water outlet temperature of the plate heat exchanger, the exhaust temperature of the compressor, the exhaust superheat of the compressor, and the low pressure temperature value of the water source air conditioning system, comprising: determining whether the water inlet temperature of the plate heat exchanger is greater than a first set water inlet temperature or less than a second set water inlet temperature; if it is determined that the water inlet temperature of the plate heat exchanger is greater than the first set water inlet temperature, or it is determined that the water inlet temperature of the plate heat exchanger is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, then the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve are adjusted according to the exhaust temperature of the compressor to realize the protection of the exhaust temperature of the compressor being too high; if it is determined that the water inlet temperature of the plate heat exchanger is less than or equal to the second set water inlet temperature, or it is determined that the water inlet temperature of the plate heat exchanger is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, then at least one of the protection of the low pressure of the water source air conditioning system being too low and the protection of the exhaust temperature of the compressor being too low is realized according to at least one of the water outlet temperature of the plate heat exchanger, the exhaust superheat of the compressor, and the low pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve.

[0008] In some embodiments, adjusting the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve according to the discharge temperature of the compressor to achieve the discharge temperature overheat protection of the compressor comprises: determining whether the discharge temperature of the compressor is greater than a first set discharge temperature continuously for a first set time; if yes, increasing the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve by a first set number of steps; otherwise, controlling the water source air conditioning system to operate according to preset normal control parameters; after increasing the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve by the first set number of steps, controlling the water source air conditioning system to operate according to control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve are increased by the first set number of steps; and determining whether the discharge temperature of the compressor is greater than a second set discharge temperature continuously for the first set time; if yes, increasing the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve by a second set number of steps; otherwise, continuing to control the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve are increased by the first set number of steps; wherein the second set discharge temperature is greater than the first set discharge temperature, and the second set number of steps is greater than the first set number of steps; after increasing the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve by the second set number of steps, controlling the water source air conditioning system to operate according to control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve are increased by the second set number of steps; and determining whether the discharge temperature of the compressor is greater than a third set discharge temperature continuously for a second set time; if yes, controlling the water source air conditioning system to stop operating; otherwise, continuing to control the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve are increased by the second set number of steps; wherein the second set time is less than the first set time, and the third set discharge temperature is greater than the second set discharge temperature; after controlling the water source air conditioning system to stop operating, determining whether the discharge temperature of the compressor is less than a fourth set discharge temperature continuously for a third set time; if yes, controlling the water source air conditioning system to resume operating; otherwise, controlling the water source air conditioning system to maintain the state of stopping operating; wherein the third set time is greater than the first set time, and the fourth set discharge temperature is less than the first set discharge temperature.

[0009] In some embodiments, at least one of the water outlet temperature of the plate heat exchanger, the discharge superheat of the compressor, and the low pressure temperature value of the water source air conditioning system is combined with the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve to realize at least one of low pressure overlow protection of the water source air conditioning system and discharge temperature overlow protection of the compressor, including: determining whether the water outlet temperature of the plate heat exchanger is greater than a first set water outlet temperature or less than a second set water outlet temperature; if it is determined that the water outlet temperature of the plate heat exchanger is greater than the first set water outlet temperature, or it is determined that the water outlet temperature of the plate heat exchanger is greater than the second set water outlet temperature and less than or equal to the first set water outlet temperature, at least one of the low pressure temperature value of the water source air conditioning system and the discharge superheat of the compressor is combined with the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve to realize at least one of low pressure overlow protection of the water source air conditioning system and discharge temperature overlow protection of the compressor; if it is determined that the water outlet temperature of the plate heat exchanger is less than or equal to the second set water outlet temperature, the low pressure temperature value of the water source air conditioning system is used to realize low pressure overlow protection of the water source air conditioning system.

[0010] In some embodiments, if it is determined that the outlet water temperature of the plate heat exchanger is greater than the first set outlet water temperature, or it is determined that the outlet water temperature of the plate heat exchanger is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, at least one protection of low pressure over low protection of the water source air conditioning system and exhaust temperature over low protection of the compressor is realized according to at least one of the low pressure temperature value of the water source air conditioning system and the exhaust superheat of the compressor, in combination with the opening of the heating electronic expansion valve and the opening of the supercooler electronic expansion valve, including: if it is determined that the outlet water temperature of the plate heat exchanger is greater than the first set outlet water temperature, it is determined whether the low pressure temperature value of the water source air conditioning system is less than the first set low pressure temperature for a continuous fourth set time; if yes, the water source air conditioning system is increased by increasing the opening of the heating electronic expansion valve and the opening of the supercooler electronic expansion valve by a first set dynamic step increase value; otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system; after the opening of the heating electronic expansion valve and the opening of the supercooler electronic expansion valve are increased by the first set dynamic step increase value, the water source air conditioning system is controlled to operate according to the control parameters after the opening of the heating electronic expansion valve and the opening of the supercooler electronic expansion valve are increased by the first set dynamic step increase value; exhaust temperature over low protection of the compressor is realized according to the exhaust superheat of the compressor, in combination with the opening of the heating electronic expansion valve and the opening of the supercooler electronic expansion valve; and it is determined whether the low pressure temperature value of the water source air conditioning system is less than the difference between the first set low pressure temperature and the set temperature for a continuous fourth set time; if yes, the compressor is controlled to stop operating; otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system.

[0011] In some embodiments, wherein, if it is determined that the outlet water temperature of the plate heat exchanger is greater than the first set outlet water temperature, or it is determined that the outlet water temperature of the plate heat exchanger is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, at least one of the low pressure temperature value of the water source air conditioning system, the exhaust gas superheat of the compressor, in combination with the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve, realizes at least one protection of the low pressure over low protection of the water source air conditioning system, and the exhaust gas temperature over low protection of the compressor, further comprising: if it is determined that the outlet water temperature of the plate heat exchanger is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, determining whether the low pressure temperature value of the water source air conditioning system is less than the second set low pressure temperature for a continuous fourth set time; if yes, increasing the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve by the second set dynamic step increase value; otherwise, controlling the water source air conditioning system to run according to the current control parameters of the water source air conditioning system; the second set low pressure temperature is greater than the first set low pressure temperature; after increasing the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve by the second set dynamic step increase value, controlling the water source air conditioning system to run according to the control parameters after the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve are increased by the second set dynamic step increase value; realizing the exhaust gas temperature over low protection of the compressor according to the exhaust gas superheat of the compressor, in combination with the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve; and determining whether the low pressure temperature value of the water source air conditioning system is less than the difference between the second set low pressure temperature and the set temperature for a continuous fourth set time; if yes, controlling the compressor to stop running; otherwise, controlling the water source air conditioning system to run according to the current control parameters of the water source air conditioning system; and / or, if it is determined that the outlet water temperature of the plate heat exchanger is less than or equal to the second set outlet water temperature, realizing the low pressure over low protection of the water source air conditioning system according to the low pressure temperature value of the water source air conditioning system, comprising: if it is determined that the outlet water temperature of the plate heat exchanger is less than or equal to the second set outlet water temperature, controlling the compressor to stop running if it is determined that the low pressure temperature value of the water source air conditioning system is less than the third set low pressure temperature for a continuous first set time; wherein the third set low pressure temperature is less than the first set low pressure temperature.

[0012] In some embodiments, the compressor discharge temperature is too low protection is achieved according to the compressor discharge superheat, in combination with the heating electronic expansion valve opening degree and the subcooler electronic expansion valve opening degree, including: in the case that the plate heat exchanger outlet water temperature is greater than a first set outlet water temperature, after the heating electronic expansion valve opening degree and the subcooler electronic expansion valve opening degree are both reduced by a first set dynamic step number reduction value, the water source air conditioning system is controlled to operate according to the control parameters after the heating electronic expansion valve opening degree and the subcooler electronic expansion valve opening degree are both reduced by the first set dynamic step number reduction value; wherein the first set dynamic step number increase value and the first set dynamic step number reduction value are dynamically calculated according to the number of adjustments to the heating electronic expansion valve opening degree and the subcooler electronic expansion valve opening degree; in the case that the plate heat exchanger outlet water temperature is greater than a second set outlet water temperature and less than or equal to the first set outlet water temperature, after the heating electronic expansion valve opening degree and the subcooler electronic expansion valve opening degree are both reduced by a second set dynamic step number reduction value, the water source air conditioning system is controlled to operate according to the control parameters after the heating electronic expansion valve opening degree and the subcooler electronic expansion valve opening degree are both reduced by the second set dynamic step number reduction value; wherein the second set dynamic step number increase value and the second set dynamic step number reduction value are dynamically calculated according to the number of adjustments to the heating electronic expansion valve opening degree and the subcooler electronic expansion valve opening degree.

[0013] In some embodiments, the first set dynamic step increase value and the first set dynamic step decrease value are dynamically calculated according to the number of adjustments to the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve, including: the first set dynamic step increase value at the nth adjustment is an initial set step number; the first set dynamic step decrease value at the nth adjustment is the first set step number; n is a positive integer; the first set dynamic step increase value at the n+1th adjustment is half of the sum of the first set dynamic step increase value at the nth adjustment and the first set dynamic step decrease value at the nth adjustment; the first set dynamic step decrease value at the n+1th adjustment is half of the sum of the first set dynamic step increase value at the n+1th adjustment and the first set dynamic step decrease value at the nth adjustment; during the adjustment process, if the first set dynamic step increase value at the m-1th adjustment is equal to the first set dynamic step decrease value at the m-1th adjustment, then the first set dynamic step increase value and the first set dynamic step decrease value are interchanged at the mth and subsequent adjustments; m is a positive integer and m is less than or equal to n; wherein the way of dynamically calculating the second set dynamic step increase value and the second set dynamic step decrease value according to the number of adjustments to the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve is the same as the way of dynamically calculating the first set dynamic step increase value and the first set dynamic step decrease value according to the number of adjustments to the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve.

[0014] According to the method, the application also provides a control device of a water source air conditioning system. The water source air conditioning system comprises a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a supercooler, a heating electronic expansion valve, a supercooler electronic expansion valve and a supercooler electromagnetic valve. The outdoor heat exchanger is a plate heat exchanger. The exhaust port of the compressor is connected to the fourth valve port of the four-way valve. The first valve port of the four-way valve is connected to the first port of the indoor heat exchanger. The second port of the indoor heat exchanger is connected to the first refrigerant pipeline of the supercooler and then divided into two paths. One path is connected to the third valve port of the four-way valve through the heating electronic expansion valve and the refrigerant heat exchange pipeline of the plate heat exchanger. The other path is connected to the second valve port of the four-way valve through the bypass pipeline of the supercooler, the supercooler electronic expansion valve, the second refrigerant pipeline of the supercooler and the supercooler electromagnetic valve. The other path is connected to the suction port of the compressor. The control device of the water source air conditioning system comprises an acquisition unit configured to acquire the water inlet temperature of the plate heat exchanger, the water outlet temperature of the plate heat exchanger, the exhaust temperature of the compressor, the exhaust superheat of the compressor and the low-pressure temperature value before the pipeline of the supercooler electromagnetic valve is divided into two paths as the low-pressure temperature value of the water source air conditioning system when the water source air conditioning system operates in a heating mode. A control unit is configured to realize at least one of the exhaust temperature overprotection of the compressor, the exhaust temperature underprotection of the compressor and the low-pressure underprotection of the water source air conditioning system according to at least one of the water inlet temperature of the plate heat exchanger, the water outlet temperature of the plate heat exchanger, the exhaust temperature of the compressor, the exhaust superheat of the compressor and the low-pressure temperature value of the water source air conditioning system, the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve.

[0015] In some embodiments, the control unit, according to at least one of the water inlet temperature of the plate heat exchanger, the water outlet temperature of the plate heat exchanger, the discharge temperature of the compressor, the discharge superheat of the compressor, and the low pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve, realizes at least one of the discharge temperature overhigh protection of the compressor, the discharge temperature overlow protection of the compressor, and the low pressure overlow protection of the water source air conditioning system, comprising: determining whether the water inlet temperature of the plate heat exchanger is greater than a first set water inlet temperature or less than a second set water inlet temperature; if it is determined that the water inlet temperature of the plate heat exchanger is greater than the first set water inlet temperature, or it is determined that the water inlet temperature of the plate heat exchanger is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, then according to the discharge temperature of the compressor, the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve are adjusted to realize the discharge temperature overhigh protection of the compressor; if it is determined that the water inlet temperature of the plate heat exchanger is less than or equal to the second set water inlet temperature, or it is determined that the water inlet temperature of the plate heat exchanger is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, then according to at least one of the water outlet temperature of the plate heat exchanger, the discharge superheat of the compressor, and the low pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve, at least one of the low pressure overlow protection of the water source air conditioning system and the discharge temperature overlow protection of the compressor is realized.

[0016] In some embodiments, the control unit, according to the discharge temperature of the compressor, adjusts the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve to achieve the discharge temperature overheat protection of the compressor, comprises: determining whether the discharge temperature of the compressor is greater than a first set discharge temperature continuously for a first set time; if yes, increasing the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve by a first set number of steps; otherwise, controlling the water source air conditioning system to operate according to preset normal control parameters; after increasing the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve by the first set number of steps, controlling the water source air conditioning system to operate according to control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve are increased by the first set number of steps; and determining whether the discharge temperature of the compressor is greater than a second set discharge temperature continuously for a first set time; if yes, increasing the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve by a second set number of steps; otherwise, continuing to control the water source air conditioning system to operate according to control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve are increased by the first set number of steps; wherein the second set discharge temperature is greater than the first set discharge temperature, and the second set number of steps is greater than the first set number of steps; after increasing the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve by the second set number of steps, controlling the water source air conditioning system to operate according to control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve are increased by the second set number of steps; and determining whether the discharge temperature of the compressor is greater than a third set discharge temperature continuously for a second set time; if yes, controlling the water source air conditioning system to stop operating; otherwise, continuing to control the water source air conditioning system to operate according to control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve are increased by the second set number of steps; wherein the second set time is less than the first set time, and the third set discharge temperature is greater than the second set discharge temperature; after controlling the water source air conditioning system to stop operating, determining whether the discharge temperature of the compressor is less than a fourth set discharge temperature continuously for a third set time; if yes, controlling the water source air conditioning system to resume operating; otherwise, controlling the water source air conditioning system to maintain the state of stopping operating; wherein the third set time is greater than the first set time, and the fourth set discharge temperature is less than the first set discharge temperature.

[0017] In some embodiments, the control unit, according to at least one of the outlet water temperature of the plate heat exchanger, the discharge superheat of the compressor, and the low pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve, realizes at least one of the low pressure over-low protection of the water source air conditioning system and the discharge temperature over-low protection of the compressor, including: determining whether the outlet water temperature of the plate heat exchanger is greater than a first set outlet water temperature or less than a second set outlet water temperature; if it is determined that the outlet water temperature of the plate heat exchanger is greater than the first set outlet water temperature, or it is determined that the outlet water temperature of the plate heat exchanger is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, then according to at least one of the low pressure temperature value of the water source air conditioning system and the discharge superheat of the compressor, in combination with the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve, realizes at least one of the low pressure over-low protection of the water source air conditioning system and the discharge temperature over-low protection of the compressor; if it is determined that the outlet water temperature of the plate heat exchanger is less than or equal to the second set outlet water temperature, then according to the low pressure temperature value of the water source air conditioning system, realizes the low pressure over-low protection of the water source air conditioning system.

[0018] In some embodiments, if the control unit determines that the outlet water temperature of the plate heat exchanger is greater than the first set outlet water temperature, or determines that the outlet water temperature of the plate heat exchanger is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, the control unit implements at least one of low pressure over low protection of the water source air conditioning system and exhaust temperature over low protection of the compressor according to at least one of the low pressure temperature value of the water source air conditioning system and the exhaust superheat of the compressor, in combination with the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve, including: if the control unit determines that the outlet water temperature of the plate heat exchanger is greater than the first set outlet water temperature, the control unit determines whether the low pressure temperature value of the water source air conditioning system is less than the first set low pressure temperature for a continuous fourth set time; if yes, the control unit increases the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve by a first set dynamic step increase value, and controls the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve are increased by the first set dynamic step increase value; otherwise, the control unit controls the water source air conditioning system to operate according to the current control parameters of the water source air conditioning system; the control unit controls the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve are increased by the first set dynamic step increase value; the control unit implements the exhaust temperature over low protection of the compressor according to the exhaust superheat of the compressor, in combination with the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve; and the control unit determines whether the low pressure temperature value of the water source air conditioning system is less than the difference between the first set low pressure temperature and the set temperature for a continuous fourth set time; if yes, the control unit controls the compressor to stop operating; otherwise, the control unit controls the water source air conditioning system to operate according to the current control parameters of the water source air conditioning system.

[0019] In some embodiments, wherein, if the control unit determines that the outlet water temperature of the plate heat exchanger is greater than the first set outlet water temperature, or determines that the outlet water temperature of the plate heat exchanger is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, at least one of the low pressure temperature value of the water source air conditioning system and the discharge superheat of the compressor is combined with the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve to realize at least one of the low pressure over low protection of the water source air conditioning system and the discharge temperature over low protection of the compressor, further comprising: if the control unit determines that the outlet water temperature of the plate heat exchanger is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, determining whether the low pressure temperature value of the water source air conditioning system is less than the second set low pressure temperature for a fourth set time; if yes, increasing the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve by a second set dynamic step increase value; otherwise, controlling the water source air conditioning system to operate according to the current control parameters of the water source air conditioning system; the second set low pressure temperature is greater than the first set low pressure temperature; after increasing the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve by the second set dynamic step increase value, controlling the water source air conditioning system to operate according to the control parameters after the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve are increased by the second set dynamic step increase value; realizing the discharge temperature over low protection of the compressor according to the discharge superheat of the compressor combined with the opening of the heating electronic expansion valve and the opening of the subcooler electronic expansion valve; and determining whether the low pressure temperature value of the water source air conditioning system is less than the difference between the second set low pressure temperature and the set temperature for a fourth set time; if yes, controlling the compressor to stop operating; otherwise, controlling the water source air conditioning system to operate according to the current control parameters of the water source air conditioning system; and / or, if the control unit determines that the outlet water temperature of the plate heat exchanger is less than or equal to the second set outlet water temperature, realizing the low pressure over low protection of the water source air conditioning system according to the low pressure temperature value of the water source air conditioning system, comprising: if the control unit determines that the outlet water temperature of the plate heat exchanger is less than or equal to the second set outlet water temperature, controlling the compressor to stop operating if the low pressure temperature value of the water source air conditioning system is less than the third set low pressure temperature for a first set time; wherein the third set low pressure temperature is less than the first set low pressure temperature.

[0020] In some embodiments, the control unit, according to the exhaust gas superheat degree of the compressor, in combination with the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve, implements the exhaust gas temperature too low protection of the compressor, including: in the case that the outlet water temperature of the plate heat exchanger is greater than a first set outlet water temperature, after reducing the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve by a first set dynamic step number reduction value, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve are reduced by the first set dynamic step number reduction value; wherein the first set dynamic step number increase value and the first set dynamic step number reduction value are dynamically calculated according to the adjustment times of the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve; in the case that the outlet water temperature of the plate heat exchanger is greater than a second set outlet water temperature and less than or equal to the first set outlet water temperature, after reducing the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve by a second set dynamic step number reduction value, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve are reduced by the second set dynamic step number reduction value; wherein the second set dynamic step number increase value and the second set dynamic step number reduction value are dynamically calculated according to the adjustment times of the opening degree of the heating electronic expansion valve and the opening degree of the subcooler electronic expansion valve.

[0021] In some embodiments, the control unit dynamically calculates the first set dynamic step increase value and the first set dynamic step decrease value according to the number of adjustments of the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve, including: the first set dynamic step increase value at the nth adjustment is an initial set step number; the first set dynamic step decrease value at the nth adjustment is a first set step number; n is a positive integer; the first set dynamic step increase value at the (n+1)th adjustment is half of the sum of the first set dynamic step increase value at the nth adjustment and the first set dynamic step decrease value at the nth adjustment; the first set dynamic step decrease value at the (n+1)th adjustment is half of the sum of the first set dynamic step increase value at the (n+1)th adjustment and the first set dynamic step decrease value at the nth adjustment; during the adjustment process, if the first set dynamic step increase value at the (m-1)th adjustment is equal to the first set dynamic step decrease value at the (m-1)th adjustment, then the first set dynamic step increase value and the first set dynamic step decrease value are interchanged at the mth adjustment and subsequent adjustments; m is a positive integer and m is less than or equal to n; wherein the control unit dynamically calculates the second set dynamic step increase value and the second set dynamic step decrease value according to the number of adjustments of the opening degree of the heating electronic expansion valve and the opening degree of the supercooler electronic expansion valve in the same way as the first set dynamic step increase value and the first set dynamic step decrease value.

[0022] In another aspect, the present application provides a water source air conditioning system matched with the above device, comprising the control device of the water source air conditioning system.

[0023] In another aspect, the present application provides a storage medium matched with the above method, comprising a stored program, wherein when the program runs, the device where the storage medium is located executes the control method of the water source air conditioning system.

[0024] Therefore, the scheme of the present application, by in the case of water source air conditioning system in heating mode, according to the water plate heat exchanger inlet temperature interval, selective execution of the compressor exhaust temperature is too high protection and unit low pressure is too low protection; In the compressor exhaust temperature is too high protection, according to the compressor exhaust temperature interval, control the opening of the supercooling electronic expansion valve and heating electronic expansion valve opening both increase, realize the compressor exhaust temperature is too high protection; In the unit of low pressure is too low protection, according to the water plate heat exchanger outlet temperature interval, combined with the low pressure temperature value interval, control the opening of the supercooling electronic expansion valve and heating electronic expansion valve opening both dynamic increase, realize the low pressure protection of unit; In control the opening of the supercooling electronic expansion valve and heating electronic expansion valve opening both dynamic increase after, in the case of the compressor exhaust temperature decreases, control the opening of the supercooling electronic expansion valve and heating electronic expansion valve opening both dynamic decrease, realize the compressor exhaust temperature is too low protection, so, by combining the water plate heat exchanger inlet temperature, the low pressure temperature value of unit, and the compressor exhaust temperature and exhaust superheat, realize the compressor exhaust temperature is too high and too low protection, and the low pressure is too low protection of unit, ensure the reliability of water source air conditioning system operation.

[0025] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application.

[0026] The technical scheme of the present application will be described in further detail below by means of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Flow chart for an embodiment of the control method of the water source air conditioning system of the present application;

[0028] Figure 2 Flow chart for an embodiment of the method of the present application according to the inlet temperature, outlet temperature, exhaust temperature, exhaust superheat and low pressure temperature value protection;

[0029] Figure 3 Flow chart for an embodiment of the method of the present application according to the exhaust temperature is too high protection;

[0030] Figure 4 Flow chart for an embodiment of the method of the present application according to the outlet temperature, exhaust superheat and low pressure temperature value is too low protection and exhaust temperature is too low protection;

[0031] Figure 5A flow chart of an embodiment of a first process for realizing low-pressure over-low protection of a water-source air conditioning system according to a low-pressure temperature value of the water-source air conditioning system and a first set low-pressure temperature in the method of the present application;

[0032] Figure 6 A flow chart of an embodiment of a second process for realizing low-pressure over-low protection of a water-source air conditioning system according to a low-pressure temperature value of the water-source air conditioning system and a second set low-pressure temperature in the method of the present application;

[0033] Figure 7 A flow chart of an embodiment of dynamically calculating a first set dynamic step number increase value and a first set dynamic step number decrease value according to the number of adjustments of the opening degree in the method of the present application;

[0034] Figure 8 A structural schematic diagram of an embodiment of the control device of the water-source air conditioning system of the present application;

[0035] Figure 9 A structural schematic diagram of an embodiment of the water-source air conditioning system of the present application;

[0036] Figure 10 A flow chart of an embodiment of the control method for balancing low-pressure and exhaust temperature when heating at low water temperature in the water-source air conditioning system of the present application;

[0037] Figure 11 A flow chart of another embodiment of the control method for balancing low-pressure and exhaust temperature when heating at low water temperature in the water-source air conditioning system of the present application.

[0038] In combination with the accompanying drawings, the reference signs in the embodiments of the present application are as follows:

[0039] 1 - compressor; 2 - oil separator; 3 - four-way valve; 4 - oil return electronic expansion valve; 5 - exhaust temperature sensing bulb; 6 - high-pressure sensor; 7 - plate heat exchanger; 8 - heating electronic expansion valve; 9 - subcooler electronic expansion valve; 10 - subcooler; 11 - subcooler electromagnetic valve; 12 - low-pressure sensor; 13 - plate heat exchanger inlet pipe temperature sensing bulb; 14 - plate heat exchanger outlet pipe temperature sensing bulb; 15 - gas-liquid separator; 16 - gas pipe; 17 - liquid pipe; 18, 19, 20 - indoor units; 21, 22, 23 - indoor unit electronic expansion valves; 24, 25, 26 - indoor unit fans; 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0041] The anti-freezing problem of the plate heat exchanger is the most important problem of the reliability of the water source air conditioning system. In order to prevent the plate heat exchanger from freezing, in addition to controlling the water inlet temperature, it is also necessary to ensure that the low pressure of the unit is not too low during heating. Therefore, in view of the low pressure during heating, the program control researchers of the water source air conditioning system will take many measures to ensure that the low pressure of the unit is not too low even during heating at low water temperature. However, this will also cause the problem of excessively low exhaust temperature, thereby causing the exhaust temperature protection.

[0042] During heating of the water source air conditioning system, the plate heat exchanger is at the low pressure side. During heating at low water temperature, due to the low water temperature, the refrigerant in the refrigerant inlet pipe of the plate heat exchanger is heat-exchanged with the low water temperature, and the temperature of the refrigerant is reduced, and the low pressure temperature of the refrigerant is reduced. If the low pressure of the refrigerant is too low, a large amount of liquid refrigerant will enter the compressor to cause liquid knock, so at this time, the supercooling electronic expansion valve and the heating electronic expansion valve need to be opened to increase the refrigerant flow of the water source air conditioning system, thereby increasing the low pressure temperature to avoid the liquid knock of the compressor. However, at the same time of opening the opening degrees of the supercooling electronic expansion valve and the heating electronic expansion valve, the exhaust temperature will be reduced. Under the condition of heating at low temperature, the operation frequency of the water source air conditioning system is low, and the exhaust temperature is low. If the opening degree is further increased, the refrigerant circulation amount of the water source air conditioning system will be increased, so the exhaust temperature of the compressor will be excessively low, and the exhaust superheat degree of the compressor cannot be guaranteed. Therefore, how to balance the low pressure and the exhaust temperature during heating of the unit is the research focus of the water source air conditioning system.

[0043] Therefore, the scheme of the present application proposes a control method for balancing the low pressure and the exhaust temperature of the water source air conditioning system in the heating mode. By combining the water inlet temperature of the plate heat exchanger, the low pressure temperature value of the unit, and the exhaust temperature and exhaust superheat degree of the compressor, the exhaust temperature overhigh and overlow protection of the compressor and the low pressure overlow protection of the unit are realized, so that the core component of the water source multi-split, i.e. the plate heat exchanger, will not appear freezing phenomenon, and the exhaust temperature of the unit will not appear excessively low to affect the operation of the water source air conditioning system.

[0044] According to the embodiments of the present application, a control method for a water source air conditioning system is provided, as shown in Figure 1The diagram shows a flow chart of an embodiment of the method of the present invention. The water-based air conditioning system includes: a compressor 1, a four-way valve 3, an indoor heat exchanger, an outdoor heat exchanger, a subcooler 10, a heating electronic expansion valve 8, a subcooler electronic expansion valve 9, and a subcooling solenoid valve 11. The indoor heat exchanger is such as the heat exchangers of indoor units 18, 19, and 20. The outdoor heat exchanger is a plate heat exchanger 7. The plate heat exchanger 7 has water heat exchange pipes and refrigerant heat exchange pipes, which are capable of exchanging heat. The four-way valve 3 has a first valve port, a second valve port, a third valve port, and a fourth valve port. The compressor 1's exhaust port is connected to the fourth port of the four-way valve 3. The first port of the four-way valve 3 is connected to the first port of the indoor heat exchanger. The second port of the indoor heat exchanger splits into two paths after passing through the first refrigerant line of the subcooler 10: one path passes through the heating electronic expansion valve 8 and the refrigerant heat exchange line of the plate heat exchanger 7, and then connects to the third port of the four-way valve 3. The other path passes through the bypass line of the subcooler 10, the subcooler electronic expansion valve 9, the second refrigerant line of the subcooler 10, and the subcooling solenoid valve 11, and then splits into two paths, one of which connects to the second port of the four-way valve 3, and the other path connects to the suction port of the compressor 1.

[0045] Specifically, Figure 9 This is a schematic diagram of one embodiment of a water source air conditioning system. Figure 9 As shown, the water source air conditioning system includes: compressor 1, oil separator 2, four-way valve 3, oil return electronic expansion valve 4, exhaust temperature sensor 5, high pressure sensor 6, plate heat exchanger 7, heating electronic expansion valve 8, subcooler electronic expansion valve 9, subcooler 10, subcooling solenoid valve 11, low pressure sensor 12, plate heat exchanger inlet pipe temperature sensor 13, plate heat exchanger outlet pipe temperature sensor 14, gas-liquid separator 15, gas pipe 16, liquid pipe 17, indoor unit 18, indoor unit 19, indoor unit 20, indoor unit electronic expansion valve 21, indoor unit electronic expansion valve 22, indoor unit electronic expansion valve 23, indoor unit fan 24, indoor unit fan 25, and indoor unit fan 26.

[0046] The exhaust port of the compressor 1 is connected to the input port of the oil separator 2. An exhaust temperature sensing bulb 5 is arranged on the pipeline where the exhaust port of the compressor 1 is located. The first output port of the oil separator 2 is connected to the fourth valve port of the four-way valve 3. A high-pressure sensor 6 is arranged on the pipeline where the first output port of the oil separator 2 is located. The second output port of the oil separator 2 is connected to the suction port of the compressor 1 through the parallel-connected oil return electronic expansion valve 4 and oil return capillary. The first valve port of the four-way valve 3 is connected to the first port of the indoor unit 18, the first port of the indoor unit 19, and the first port of the indoor unit 20 through the air pipe 16. The first port of the indoor unit 18 is connected to the second port of the indoor unit 20 through the indoor unit electronic expansion valve 21. The first port of the indoor unit 19 is connected to the second port of the indoor unit 20 through the indoor unit electronic expansion valve 22. The first port of the indoor unit 20 is connected to the second port of the indoor unit 20 through the indoor unit electronic expansion valve 23. The second port of the indoor unit 20 is connected to the first port of the first heat exchange pipeline of the subcooler 10 through the liquid pipe 17. The second port of the first heat exchange pipeline of the subcooler 10 is connected to the first port of the refrigerant heat exchange pipeline of the plate heat exchanger 7 through the heating electronic expansion valve 8. The second port of the first heat exchange pipeline of the subcooler 10 is connected to the first port of the second heat exchange pipeline of the subcooler 10 through the subcooler electronic expansion valve 9. The second port of the second heat exchange pipeline of the subcooler 10 is connected to the second valve port of the four-way valve 3 and the first port of the gas-liquid separator 15 through the subcooler solenoid valve 11. The second port of the gas-liquid separator 15 is connected to the suction port of the compressor 1. A low-pressure sensor 12 is arranged on the pipeline before the subcooler solenoid valve 11 is connected to the four-way valve 3 and the gas-liquid separator 15. The plate heat exchanger 7 has a water heat exchange pipeline and a refrigerant heat exchange pipeline, the water heat exchange pipeline and the refrigerant heat exchange pipeline can exchange heat, and the water heat exchange pipeline has a water inlet and a water outlet. A plate heat exchanger outlet pipe temperature sensing bulb 14 is arranged on the pipeline where the first port of the refrigerant heat exchange pipeline of the plate heat exchanger 7 is located. The second port of the refrigerant heat exchange pipeline of the plate heat exchanger 7 is connected to the third valve port of the four-way valve 3. The control method of the water source air conditioning system comprises steps S110 to S120.

[0047] At step S110, when the water source air conditioning system operates in the heating mode, the inlet water temperature of the plate heat exchanger 7 is obtained, such as the temperature at the inlet of the water heat exchange pipeline of the plate heat exchanger 7, denoted as the inlet water temperature T1 of the plate heat exchanger 7. The outlet water temperature of the plate heat exchanger 7 is obtained, such as the temperature at the outlet of the water heat exchange pipeline of the plate heat exchanger 7, denoted as the outlet water temperature T3 of the plate heat exchanger 7. The discharge temperature of the compressor 1 is obtained, such as the temperature detected by the discharge temperature bulb 5 in the pipeline where the discharge port of the compressor 1 is located, denoted as the discharge temperature T2 of the compressor 1. The discharge superheat of the compressor 1 is obtained, such as determining the discharge superheat T5 of the compressor according to the discharge temperature T2 of the compressor 1, for example, the temperature difference between the discharge temperature T2 of the compressor 1 and the saturation temperature corresponding to the actual condensing pressure, denoted as the discharge superheat T5 of the compressor 1. The low pressure temperature value before the pipeline where the subcooling electromagnetic valve 11 is located is divided into two paths, as the low pressure temperature value of the water source air conditioning system, such as the low pressure value detected by the low pressure sensor 12 in the pipeline where one port of the subcooling electromagnetic valve 11 is located, and the low pressure temperature value of the refrigerant in the water source air conditioning system is calculated according to the corresponding relationship between the low pressure value and the temperature value, denoted as the low pressure temperature value T4 of the water source air conditioning system.

[0048] At step S120, at least one of the inlet water temperature of the plate heat exchanger 7, the outlet water temperature of the plate heat exchanger 7, the discharge temperature of the compressor 1, the discharge superheat of the compressor 1, and the low pressure temperature value of the water source air conditioning system is combined with the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooling electronic expansion valve 9 to realize at least one of the discharge temperature overhigh protection of the compressor 1, the discharge temperature overlow protection of the compressor 1, and the low pressure overlow protection of the water source air conditioning system.

[0049] The control method for balancing the low pressure and the discharge temperature of the water source air conditioning system in the low water temperature heating mode provided by the scheme of the present application realizes the discharge temperature overhigh and overlow protection of the compressor and the low pressure overlow protection of the unit by combining the inlet water temperature of the plate heat exchanger, the low pressure temperature value of the unit, and the discharge temperature and discharge superheat of the compressor, so that the core component of the water source multi-connected unit, i.e. the plate heat exchanger, will not freeze, and the discharge temperature of the unit will not be too low to affect the operation of the water source air conditioning system.

[0050] In some embodiments, in step S120, at least one of the water inlet temperature of the plate heat exchanger 7, the water outlet temperature of the plate heat exchanger 7, the discharge temperature of the compressor 1, the discharge superheat of the compressor 1, and the low pressure temperature value of the water source air conditioning system is combined with the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 to realize at least one of the discharge temperature overhigh protection of the compressor 1, the discharge temperature overlow protection of the compressor 1, and the low pressure overlow protection of the water source air conditioning system. See the following exemplary description.

[0051] The following describes an embodiment of the method of the present application in which protection is performed according to the water inlet temperature, the water outlet temperature, the discharge temperature, the discharge superheat, and the low pressure temperature value. Figure 2 The following describes an embodiment of the method of the present application in which protection is performed according to the water inlet temperature, the water outlet temperature, the discharge temperature, the discharge superheat, and the low pressure temperature value.

[0052] In step S210, it is determined whether the water inlet temperature of the plate heat exchanger 7 is greater than a first set water inlet temperature or less than a second set water inlet temperature. The first set water inlet temperature is, for example, temperature X ℃, and the second set water inlet temperature is, for example, temperature Y ℃.

[0053] In step S220, if it is determined that the water inlet temperature of the plate heat exchanger 7 is greater than the first set water inlet temperature, or if it is determined that the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are adjusted according to the discharge temperature of the compressor 1 to realize the discharge temperature overhigh protection of the compressor 1.

[0054] In step S230, if it is determined that the water inlet temperature of the plate heat exchanger 7 is less than or equal to the second set water inlet temperature, or if it is determined that the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, at least one of the water outlet temperature of the plate heat exchanger 7, the discharge superheat of the compressor 1, and the low pressure temperature value of the water source air conditioning system is combined with the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 to realize at least one of the low pressure overlow protection of the water source air conditioning system and the discharge temperature overlow protection of the compressor 1.

[0055] Specifically, Figure 10 The following describes an embodiment of the control method for balancing the low pressure and the discharge temperature of the water source air conditioning system during low water temperature heating, Figure 11Flowchart of another embodiment of the control method for balancing low pressure and discharge temperature of water source air conditioning system in low water temperature heating. As shown in Figure 10 and Figure 11 The control method for balancing low pressure and discharge temperature of water source air conditioning system in low water temperature heating proposed by the scheme of the present application comprises:

[0056] Step 1, the water source air conditioning system is started in heating mode, and then step 2 is performed.

[0057] Step 2, the water inlet temperature T1 of the plate heat exchanger 7 is obtained, and then step 3 is performed.

[0058] Step 3, it is judged whether the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature X℃ or whether the water inlet temperature T1 of the plate heat exchanger 7 is less than temperature Y℃, and step 4 or step 5 is selectively performed according to the judgment result. Preferably, temperature X℃ can be above 40℃, and preferably temperature Y℃ is 20℃.

[0059] Specifically, if the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature X℃, or the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature Y℃ and less than or equal to temperature X℃, step 4 is performed, that is, the discharge temperature T2 of the compressor 1 is detected, and the discharge temperature overprotection of the compressor 1 is performed.

[0060] If the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature Y℃ and less than or equal to temperature X℃, or the water inlet temperature T1 of the plate heat exchanger 7 is less than or equal to temperature Y℃, step 5 is performed, that is, the water outlet temperature T3 of the plate heat exchanger 7 and the low pressure temperature value T4 of the water source air conditioning system are detected, and the low pressure overprotection of the water source air conditioning system is performed.

[0061] Wherein, in the case that the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature Y℃ and less than or equal to temperature X℃, the discharge temperature overprotection of the compressor 1 and the low pressure overprotection of the water source air conditioning system are performed at the same time, and the corresponding control logic is adopted.

[0062] In some embodiments, in step S220, in the case that the water inlet temperature of the plate heat exchanger 7 is greater than the first set water inlet temperature, or the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 are adjusted according to the discharge temperature of the compressor 1 to realize the specific process of the discharge temperature overprotection of the compressor 1, which is described in the following examples.

[0063] The following will be described in combination with Figure 3An embodiment flowchart of the method of the present application is shown in Figure 3, which further illustrates the specific process of the exhaust temperature overprotection according to the exhaust temperature in step S220. The process includes steps S310 to S340.

[0064] In step S310, it is determined whether the exhaust temperature of the compressor 1 is greater than a first set exhaust temperature for a first set time. If yes, the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are both increased by a first set number of steps. Otherwise, the water source air conditioning system is controlled to operate according to the preset normal control parameters, e.g., the water source air conditioning system is controlled to operate according to the preset normal control parameters in the heating mode. The first set time is, for example, 10 s, and the first set exhaust temperature is, for example, temperature A1 °C.

[0065] In step S320, after the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are both increased by the first set number of steps, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are both increased by the first set number of steps. It is then determined whether the exhaust temperature of the compressor 1 is greater than a second set exhaust temperature for the first set time. If yes, the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are both increased by a second set number of steps. Otherwise, the water source air conditioning system is continued to be controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are both increased by the first set number of steps. The second set exhaust temperature is greater than the first set exhaust temperature, and the second set number of steps is greater than the first set number of steps. The second set exhaust temperature is, for example, temperature A2 °C.

[0066] In step S330, after the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are both increased by the second set number of steps, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are both increased by the second set number of steps. It is then determined whether the exhaust temperature of the compressor 1 is greater than a third set exhaust temperature for a second set time. If yes, the water source air conditioning system is controlled to stop operating. Otherwise, the water source air conditioning system is continued to be controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are both increased by the second set number of steps. The second set time is less than the first set time, and the third set exhaust temperature is greater than the second set exhaust temperature. The third set exhaust temperature is, for example, temperature A3 °C.

[0067] Step S340, after controlling the water source air conditioning system to stop running, determine whether the discharge temperature of the compressor 1 is less than the fourth set discharge temperature for a third set time: if yes, control the water source air conditioning system to resume operation, and then return to re-according to at least one of the water inlet temperature of the plate heat exchanger 7, the water outlet temperature of the plate heat exchanger 7, the discharge temperature of the compressor 1, the discharge superheat of the compressor 1, and the low pressure temperature value of the water source air conditioning system, combined with the opening of the heating electronic expansion valve 8 and the opening of the subcooling electronic expansion valve 9, to realize at least one of the discharge temperature overprotection of the compressor 1, the discharge temperature underprotection of the compressor 1, and the low pressure underprotection of the water source air conditioning system. Otherwise, control the water source air conditioning system to maintain the state of stopping running. Wherein, the third set time is greater than the first set time, and the fourth set discharge temperature is less than the first set discharge temperature. The third set time is 3min, and the fourth set discharge temperature is A4℃.

[0068] Specifically, as shown in Figure 10 and Figure 11 The water source air conditioning system balance low pressure and discharge temperature control method in low water temperature heating of the scheme of the present application also includes:

[0069] Step 4, in the case that the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature X℃, or the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature Y℃ and less than or equal to temperature X℃, the discharge temperature T2 of the compressor 1 is detected, which can be specifically: obtaining the temperature detected by the discharge temperature sensing package 5 in the pipeline where the discharge port of the compressor 1 is located, and recording it as the discharge temperature T2 of the compressor 1. Further, according to the discharge temperature T2 of the compressor 1, the following steps such as steps 41 to 47 are executed to protect the compressor 1 from over high discharge temperature.

[0070] Step 41, determine whether the discharge temperature T2 of the compressor 1 is greater than temperature A1℃ for 10s: if yes, execute step 42, otherwise the parameters of the water source air conditioning system are controlled according to the normal control parameters in the heating mode. Preferably, temperature A1℃ is 90℃-95℃.

[0071] Step 42, increase the opening of the subcooling electronic expansion valve 9 and the opening of the heating electronic expansion valve 8 by step V1, and then execute step 43. For example, step V1 can be 100 steps.

[0072] Step 43, judging whether the discharge temperature T2 of the compressor 1 is greater than temperature A2℃ for 10s continuously: if yes, executing step 44, otherwise the parameters of the water-source air conditioning system are controlled according to the adjusted control parameters in the last heating mode, if not adjusted, the parameters of the water-source air conditioning system are actually controlled according to the normal control parameters in the heating mode. Preferably, temperature A2℃ is 95℃-100℃.

[0073] Step 44, increasing the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 by step number V2, and then executing step 45. For example, step number V2 can be 120 steps.

[0074] Step 45, judging whether the discharge temperature T2 of the compressor 1 is greater than temperature A3℃ for 3s continuously: if yes, executing step 46, otherwise the parameters of the water-source air conditioning system are controlled according to the adjusted control parameters in the last heating mode, if not adjusted, the parameters of the water-source air conditioning system are actually controlled according to the normal control parameters in the heating mode. Preferably, temperature A3℃ is above 100℃.

[0075] Step 46, after controlling the whole machine of the water-source air conditioning system to stop running, judging whether the discharge temperature T2 of the compressor 1 is less than temperature A4℃ for 3min continuously: if yes, executing step 47, otherwise the whole machine of the water-source air conditioning system maintains the state of stop. Preferably, temperature A4℃ is 85℃-90℃.

[0076] Step 47, controlling the whole machine of the water-source air conditioning system to resume running, and then returning to at least one of step 41, step 43 and step 45.

[0077] In some embodiments, in step S230, when the water inlet temperature of the plate heat exchanger 7 is less than or equal to the second set water inlet temperature, or the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, the specific process of at least one of the low-pressure over-low protection of the water-source air conditioning system and the discharge temperature over-low protection of the compressor 1 is realized according to at least one of the water outlet temperature of the plate heat exchanger 7, the discharge superheat of the compressor 1 and the low-pressure temperature value of the water-source air conditioning system, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooling electronic expansion valve 9, see the following exemplary description.

[0078] The following will be described in combination with Figure 4An embodiment flowchart of the method of the present application is shown, which further illustrates the specific process of the low-pressure over-protection and the exhaust temperature over-protection according to the outlet water temperature, the exhaust gas superheat and the low-pressure temperature value in step S230, including steps S410 to S430.

[0079] In step S410, it is determined whether the outlet water temperature of the plate heat exchanger 7 is greater than a first set outlet water temperature or less than a second set outlet water temperature, the first set outlet water temperature being, for example, temperature B1℃, and the second set outlet water temperature being, for example, temperature B2℃.

[0080] In step S420, if it is determined that the outlet water temperature of the plate heat exchanger 7 is greater than the first set outlet water temperature, or it is determined that the outlet water temperature of the plate heat exchanger 7 is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, at least one of the low-pressure over-protection of the water source air conditioning system and the exhaust temperature over-protection of the compressor 1 is realized according to at least one of the low-pressure temperature value of the water source air conditioning system and the exhaust gas superheat of the compressor 1, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9.

[0081] In step S430, if it is determined that the outlet water temperature of the plate heat exchanger 7 is less than or equal to the second set outlet water temperature, the low-pressure over-protection of the water source air conditioning system is realized according to the low-pressure temperature value of the water source air conditioning system.

[0082] Specifically, as shown in Figure 10 and Figure 11 The control method for balancing the low pressure and the exhaust temperature of the water source air conditioning system during low water temperature heating according to the scheme of the present application further includes:

[0083] In step 5, the outlet water temperature T3 of the plate heat exchanger 7 and the low-pressure temperature value T4 of the water source air conditioning system are detected in the case that the inlet water temperature T1 of the plate heat exchanger 7 is greater than temperature Y℃ and less than or equal to temperature X℃, or the inlet water temperature T1 of the plate heat exchanger 7 is less than or equal to temperature Y℃. Further, according to the outlet water temperature T3 of the plate heat exchanger 7 and the low-pressure temperature value T4 of the water source air conditioning system, the following step, for example, step 6, is executed to perform the low-pressure over-protection of the water source air conditioning system.

[0084] In step 6, it is determined whether the outlet water temperature T3 of the plate heat exchanger 7 is greater than temperature B1℃ or less than temperature B2℃, and step 7 or step 8 or step 9 is selectively executed according to the determination result. Preferably, temperature B1℃ is 10℃, and preferably, temperature B2℃ is 5℃.

[0085] Specifically, if the outlet water temperature T3 of the plate heat exchanger 7 is greater than the temperature B1℃, then step 7 is executed, that is, the low-pressure overpressure protection of the water source air conditioning system is performed according to the low-pressure temperature value T4 of the water source air conditioning system.

[0086] If the outlet water temperature T3 of the plate heat exchanger 7 is less than or equal to temperature B1℃ and greater than temperature B2℃, then step 8 is executed, that is, the water source air conditioning system is protected against low pressure and overpressure according to the low pressure temperature value T4 of the water source air conditioning system.

[0087] If the outlet water temperature T3 of the plate heat exchanger 7 is less than or equal to the temperature B2℃, then step 9 is executed, that is, the low-pressure and overpressure protection of the water source air conditioning system is performed according to the low-pressure temperature value T4 of the water source air conditioning system.

[0088] In some embodiments, in step S420, if the inlet water temperature of the plate heat exchanger 7 is less than or equal to the second set inlet water temperature, or the inlet water temperature of the plate heat exchanger 7 is less than or equal to the first set inlet water temperature and greater than the second set inlet water temperature, and if it is determined that the outlet water temperature of the plate heat exchanger 7 is greater than the first set outlet water temperature, or if it is determined that the outlet water temperature of the plate heat exchanger 7 is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, then at least one of the following protections—low-pressure protection of the water source air conditioning system and low-temperature protection of the compressor 1—is implemented based on at least one of the low-pressure temperature value of the water source air conditioning system and the exhaust superheat of the compressor 1, combined with the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9. This includes: a first process of implementing low-pressure protection of the water source air conditioning system based on the low-pressure temperature value of the water source air conditioning system and the first set low-pressure temperature.

[0089] The following is combined with Figure 5 The schematic diagram shown is an embodiment of the method of the present invention, which implements the first process of low-pressure protection of the water source air conditioning system based on the low-pressure temperature value of the water source air conditioning system and the first set low-pressure temperature. The specific process of the first process of implementing the low-pressure protection of the water source air conditioning system based on the low-pressure temperature value of the water source air conditioning system and the first set low-pressure temperature in step S420 is further explained, including: steps S510 to S520.

[0090] Step S510, if the outlet water temperature of the plate heat exchanger 7 is greater than the first set outlet water temperature, determine whether the low pressure temperature value of the water source air conditioning system is less than the first set low pressure temperature for a fourth set time: if yes, increase the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooling electronic expansion valve 9 by the first set dynamic step increase value. Otherwise, control the water source air conditioning system to operate according to the current control parameters of the water source air conditioning system. The fourth set time is, for example, 5 minutes, the first set low pressure temperature is, for example, temperature C1℃, and the first set dynamic step increase value is, for example, step V x .

[0091] Step S520, after increasing the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooling electronic expansion valve 9 by the first set dynamic step increase value, control the water source air conditioning system to operate according to the control parameters after increasing the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooling electronic expansion valve 9 by the first set dynamic step increase value. According to the discharge superheat of the compressor 1, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooling electronic expansion valve 9, the discharge temperature overlow protection of the compressor 1 is realized. And determine whether the low pressure temperature value of the water source air conditioning system is less than the difference between the first set low pressure temperature and the set temperature for a fourth set time: if yes, control the compressor 1 to stop operating. Otherwise, control the water source air conditioning system to operate according to the current control parameters of the water source air conditioning system, that is, continue to control the water source air conditioning system to operate according to the control parameters after increasing the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooling electronic expansion valve 9 by the first set dynamic step increase value.

[0092] Specifically, as shown in Figure 10 and Figure 11 , the water source air conditioning system provided by the scheme of the present application also includes the following steps:

[0093] Step 7, in the case that the outlet water temperature T3 of the plate heat exchanger 7 is greater than temperature B1℃, according to the low pressure temperature value T4 of the water source air conditioning system, the following steps such as steps 71 to 74 are executed to perform low pressure overpressure protection on the water source air conditioning system.

[0094] Step 71, determine whether the low pressure temperature value T4 of the water source air conditioning system detected continuously for 5 minutes is less than temperature C1℃: if yes, execute step 72, otherwise execute step 74. Preferably, temperature C1℃ is 2℃.

[0095] Step 72, increase the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 by step V x , and then execute step 73.

[0096] Step 73, determining whether the low-pressure temperature value T4 of the water-source air conditioning system detected in the last 5 minutes is less than temperature (C1-5) ℃: if yes, controlling the compressor 1 to stop running, otherwise executing step 74.

[0097] Step 74, controlling the water-source air conditioning system to maintain the current control parameters to continue running, and then executing step 10, i.e., determining the exhaust gas superheat T5 of the compressor according to the exhaust gas temperature T2 of the compressor 1, and performing the exhaust gas temperature too low protection for the compressor 1.

[0098] In some embodiments, in step S420, if the water inlet temperature of the plate heat exchanger 7 is less than or equal to the second set water inlet temperature, or the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, and if it is determined that the water outlet temperature of the plate heat exchanger 7 is greater than the first set water outlet temperature, or it is determined that the water outlet temperature of the plate heat exchanger 7 is greater than the second set water outlet temperature and less than or equal to the first set water outlet temperature, then at least one of the low-pressure too low protection of the water-source air conditioning system and the exhaust gas temperature too low protection of the compressor 1 is implemented according to at least one of the low-pressure temperature value of the water-source air conditioning system and the exhaust gas superheat of the compressor 1, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9, and the second process of the low-pressure too low protection of the water-source air conditioning system according to the low-pressure temperature value of the water-source air conditioning system and the second set low-pressure temperature is further included.

[0099] The following will be described in detail with reference to the flowchart of the second process of the low-pressure too low protection of the water-source air conditioning system according to the low-pressure temperature value of the water-source air conditioning system and the second set low-pressure temperature in the method of the present application shown in FIG. 6. Figure 6 The following will be described in detail with reference to the flowchart of the second process of the low-pressure too low protection of the water-source air conditioning system according to the low-pressure temperature value of the water-source air conditioning system and the second set low-pressure temperature in the method of the present application shown in FIG. 6.

[0100] Step S610, if it is determined that the water outlet temperature of the plate heat exchanger 7 is greater than the second set water outlet temperature and less than or equal to the first set water outlet temperature, then it is determined whether the low-pressure temperature value of the water-source air conditioning system is less than the second set low-pressure temperature for a continuous fourth set time: if yes, the water-source air conditioning system is controlled to increase the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 by a second set dynamic step increase value. Otherwise, the water-source air conditioning system is controlled to run according to the current control parameters of the water-source air conditioning system. The second set low-pressure temperature is greater than the first set low-pressure temperature. The fourth set time is, for example, 5 minutes, the second set low-pressure temperature is, for example, temperature C2 ℃, and the second set dynamic step increase value is, for example, step V z .

[0101] Step S620, after increasing the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 by the second set dynamic step number increase value, the water source air conditioning system is controlled to run according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 are increased by the second set dynamic step number increase value. According to the discharge superheat of the compressor 1, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9, the discharge temperature of the compressor 1 is protected. In addition, it is determined whether the low pressure temperature value of the water source air conditioning system is less than the difference between the second set low pressure temperature and the set temperature for a continuous fourth set time: if yes, the compressor 1 is controlled to stop running. Otherwise, the water source air conditioning system is controlled to run according to the current control parameters of the water source air conditioning system, i.e. the water source air conditioning system is controlled to continue running according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 are increased by the second set dynamic step number increase value.

[0102] Specifically, as shown in Figure 10 and Figure 11 , the water source air conditioning system provided by the scheme of the present application also includes the following steps in the control method for balancing the low pressure and the discharge temperature during low water temperature heating.

[0103] Step 8, in the case that the outlet water temperature T3 of the plate heat exchanger 7 is less than or equal to temperature B1℃ and greater than temperature B2℃, according to the low pressure temperature value T4 of the water source air conditioning system, the following steps are executed, such as steps 81 to 84, to perform low pressure overpressure protection on the water source air conditioning system.

[0104] Step 81, it is determined whether the low pressure temperature value T4 of the water source air conditioning system detected continuously for 5 min is less than temperature C2℃: if yes, step 82 is executed, otherwise step 84 is executed. Preferably, temperature C2℃ is 5℃.

[0105] Step 82, the opening degree of the supercooler electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both increased by a step number V z , and then step 83 is executed.

[0106] Step 83, it is determined whether the low pressure temperature value T4 of the water source air conditioning system detected continuously for 5 min is less than temperature (C2-5)℃: if yes, the compressor 1 is controlled to stop running, otherwise step 84 is executed.

[0107] Step 84, the water source air conditioning system is controlled to continue running according to the current control parameters, and then step 10 is executed, i.e. according to the discharge temperature T2 of the compressor 1, the discharge superheat T5 of the compressor is determined to protect the discharge temperature of the compressor 1 from being too low.

[0108] In some embodiments, in the case that the water inlet temperature of the plate heat exchanger 7 is less than or equal to the second set water inlet temperature, or the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, if it is determined that the water outlet temperature of the plate heat exchanger 7 is less than or equal to the second set water outlet temperature, then the low pressure over low protection of the water source air conditioning system is realized according to the low pressure temperature value of the water source air conditioning system, including: if it is determined that the water outlet temperature of the plate heat exchanger 7 is less than or equal to the second set water outlet temperature, then the compressor 1 is controlled to stop running in the case that it is determined that the low pressure temperature value of the water source air conditioning system is less than the third set low pressure temperature for a first set time, wherein the third set low pressure temperature is less than the first set low pressure temperature, and the third set low pressure temperature is, for example, temperature C3℃.

[0109] Specifically, as shown in Figure 10 and Figure 11 the control method for balancing the low pressure and the exhaust temperature of the water source air conditioning system during low water temperature heating according to the present application further comprises:

[0110] Step 9: in the case that the water outlet temperature T3 of the plate heat exchanger 7 is less than or equal to temperature B2℃, the low pressure over pressure protection of the water source air conditioning system is performed according to the low pressure temperature value T4 of the water source air conditioning system, including the following steps, such as steps 91 to 92.

[0111] Step 91: it is determined whether the low pressure temperature value T4 of the water source air conditioning system detected continuously for 10s is less than temperature C3℃: if yes, step 92 is performed, otherwise the water source air conditioning system is controlled to maintain the current control parameters and continue running. Preferably, temperature C3℃ is 0℃.

[0112] Step 92: the compressor 1 is controlled to stop running.

[0113] In some embodiments, in the case that the water inlet temperature of the plate heat exchanger 7 is less than or equal to the second set water inlet temperature, or the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, and in the case that the water outlet temperature of the plate heat exchanger 7 is greater than the first set water outlet temperature, or the water outlet temperature of the plate heat exchanger 7 is greater than the second set water outlet temperature and less than or equal to the first set water outlet temperature, the exhaust temperature over low protection of the compressor 1 is realized according to the exhaust superheat degree of the compressor 1, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9, including any one of the following exhaust temperature over low protection situations:

[0114] The first exhaust temperature protection case: in the case that the water outlet temperature of the plate heat exchanger 7 is greater than the first set water outlet temperature, the opening of the heating electronic expansion valve 8 and the opening of the supercooler electronic expansion valve 9 are both reduced by the first set dynamic step reduction value, then the water source air conditioning system is controlled to run according to the control parameters after the opening of the heating electronic expansion valve 8 and the opening of the supercooler electronic expansion valve 9 are both reduced by the first set dynamic step reduction value, and then returns to re-achieve at least one of the exhaust temperature protection of the compressor 1, the exhaust temperature protection of the compressor 1, and the low pressure protection of the water source air conditioning system according to at least one of the water inlet temperature of the plate heat exchanger 7, the water outlet temperature of the plate heat exchanger 7, the exhaust temperature of the compressor 1, the exhaust superheat of the compressor 1, and the low pressure temperature value of the water source air conditioning system, in combination with the opening of the heating electronic expansion valve 8 and the opening of the supercooler electronic expansion valve 9. The first set dynamic step reduction value is, for example, step V y .

[0115] The first set dynamic step increase value and the first set dynamic step reduction value are dynamically calculated according to the number of adjustments of the opening of the heating electronic expansion valve 8 and the opening of the supercooler electronic expansion valve 9. The first set dynamic step increase value and the first set dynamic step reduction value in the current adjustment are calculated according to the first set dynamic step increase value and the first set dynamic step reduction value in the last adjustment.

[0116] The second exhaust temperature protection case: in the case that the water outlet temperature of the plate heat exchanger 7 is greater than the second set water outlet temperature and less than or equal to the first set water outlet temperature, the opening of the heating electronic expansion valve 8 and the opening of the supercooler electronic expansion valve 9 are both reduced by the second set dynamic step reduction value, then the water source air conditioning system is controlled to run according to the control parameters after the opening of the heating electronic expansion valve 8 and the opening of the supercooler electronic expansion valve 9 are both reduced by the second set dynamic step reduction value, and then returns to re-achieve at least one of the exhaust temperature protection of the compressor 1, the exhaust temperature protection of the compressor 1, and the low pressure protection of the water source air conditioning system according to at least one of the water inlet temperature of the plate heat exchanger 7, the water outlet temperature of the plate heat exchanger 7, the exhaust temperature of the compressor 1, the exhaust superheat of the compressor 1, and the low pressure temperature value of the water source air conditioning system, in combination with the opening of the heating electronic expansion valve 8 and the opening of the supercooler electronic expansion valve 9. The second set dynamic step reduction value is, for example, step V p .

[0117] The second set dynamic step increase value and the second set dynamic step decrease value are dynamically calculated according to the adjustment times of the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooling electronic expansion valve 9, and the second set dynamic step increase value and the second set dynamic step decrease value in the current adjustment are calculated according to the second set dynamic step increase value and the second set dynamic step decrease value in the last adjustment.

[0118] Specifically, as shown in Figure 10 and Figure 11 , the water source air conditioning system provided by the scheme of the present application further comprises the following steps:

[0119] Step 10, when the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are increased by a step number, the low-pressure overpressure protection of the water source air conditioning system is entered, and the exhaust temperature of the compressor 1 is protected, i.e., the following steps are performed to protect the exhaust temperature of the compressor 1.

[0120] Step 11, the exhaust superheat T5 of the compressor 1 is determined according to the exhaust temperature T2 of the compressor 1, and then step 12 or step 13 is performed.

[0121] Step 12, when the exhaust superheat T5 of the compressor 1 is less than temperature D ℃, the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both decreased by a step number V y . Preferably, D ℃ is 30-35 ℃.

[0122] In step 72, the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both increased by a step number V x , and in step 12, the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both decreased by a step number V y . The step number V x and the step number V y are dynamic, i.e., when the outlet water temperature T3 of the plate heat exchanger 7 is greater than temperature B1 ℃, the increase or decrease of the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 is dynamically adjusted to ensure that the low-pressure protection and the exhaust temperature too low do not occur under the condition of low-temperature heating.

[0123] Step 13, when the exhaust superheat T5 of the compressor 1 is less than temperature D ℃, the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both decreased by a step number V p .

[0124] wherein the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both increased by the step number V in step 82 z , the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both decreased by the step number V in step 13 p . The step number V z and the step number V p are dynamically determined, that is, in the case that the outlet water temperature T3 of the plate heat exchanger 7 is less than or equal to the temperature B1℃ and greater than the temperature B2℃, the increase or decrease of the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 is dynamically adjusted to ensure that the low pressure protection does not occur and the exhaust temperature is not too low under the low temperature heating condition.

[0125] In some embodiments, the specific process of dynamically calculating the first set dynamic step number increase value and the first set dynamic step number decrease value according to the adjustment times of the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooling electronic expansion valve 9 is shown in the following example.

[0126] The following is an embodiment flowchart of dynamically calculating the first set dynamic step number increase value and the first set dynamic step number decrease value according to the adjustment times of the opening degree of the method of the present application shown in Figure 7 The following is an embodiment flowchart of dynamically calculating the first set dynamic step number increase value and the first set dynamic step number decrease value according to the adjustment times of the opening degree of the method of the present application shown in

[0127] Step S710, the first set dynamic step number increase value at the nth adjustment is the initial set step number, such as the step number V0. The first set dynamic step number decrease value at the nth adjustment is the first set step number. n is a positive integer. For example, the step number V0 can be 95 steps.

[0128] Step S720, the first set dynamic step number increase value at the n+1th adjustment is half of the sum of the first set dynamic step number increase value at the nth adjustment and the first set dynamic step number decrease value at the nth adjustment. The first set dynamic step number decrease value at the n+1th adjustment is half of the sum of the first set dynamic step number increase value at the n+1th adjustment and the first set dynamic step number decrease value at the nth adjustment.

[0129] Step S730, in the adjustment process, if the first set dynamic step number increase value at the m-1th adjustment is equal to the first set dynamic step number decrease value at the m-1th adjustment, then the first set dynamic step number increase value and the first set dynamic step number decrease value are interchanged at the mth adjustment and thereafter. m is a positive integer and m is less than or equal to n.

[0130] The second set dynamic step increase value and the second set dynamic step decrease value are calculated dynamically according to the adjustment times of the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9.

[0131] Specifically, as shown in Figure 10 and Figure 11 , the water source air conditioning system according to the present application further comprises:

[0132] In step 72 and step 12, when the outlet water temperature T3 of the plate heat exchanger 7 is greater than temperature B1℃, the step number V x and the step number V y are calculated according to the step number of the last adjustment.

[0133] For example, in the nth adjustment, the increased step number V x =V0, and the decreased step number V y =V1. n is a positive integer.

[0134] In the n+1th adjustment, the increased step number V x =((V0+V1) / 2+V1) / 2, and the decreased step number V

[0135] V y =((V0+V1) / 2+V1) / 2. That is, in the n+1th adjustment, the increased step number V x is half of the sum of the nth increased step number and the nth decreased step number. The decreased step number V y is half of the sum of the n+1th increased step number and the nth decreased step number.

[0136] In the n+2th adjustment, the increased step number V x =(((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2+((V0+V1) / 2+V1) / 2) / 2, and the decreased step number V y =(((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2+((V0+V1) / 2+V1) / 2) / 2. That is, in the n+2th adjustment, the increased step number V x is half of the sum of the n+1th increased step number and the nth decreased step number. The decreased step number V yIt is half the sum of the number of steps added in the (n+2)th iteration and the number of steps removed in the (n+1)th iteration. And so on.

[0137] For example: during the adjustment process, when the number of steps increased, i.e., the number of steps V... x = The number of steps reduced, i.e., the number of steps V y For example, the number of steps V added after the (m-1)th adjustment. x = The number of steps reduced, i.e., the number of steps V y Let m be a positive integer greater than or equal to 1. Then, the next step is V. x and steps V y The dynamic value retrieval method is as follows:

[0138] The number of steps reduced during the m-th adjustment is the step count V. y =V0, the number of steps added is V. x =V1. That is, the number of steps increased and decreased are interchanged in the m-th adjustment.

[0139] The number of steps reduced during the (m+1)th adjustment is the number of steps V. y = (V0 + V1) / 2, where the number of steps is V. x = ((V0+V1) / 2+V1) / 2. That is, in the (m+1)th adjustment, the number of steps reduced is the number of steps V. y It is half the sum of the number of steps increased in the m-th iteration and the number of steps decreased in the m-th iteration. The number of steps increased is the number of steps V. x V is the number of steps reduced in the (m+1)th iteration. y Half of the sum of the number of steps increased in the m-th increment.

[0140] In the (m+2)th adjustment, the number of steps reduced is the number of steps V. y = ((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2, where the number of steps added is the number of steps V. x = (((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2+((V0+V1) / 2+V1) / 2) / 2. That is, in the (m+2)th adjustment, the number of steps reduced is the number of steps V. y It is half the sum of the number of steps increased in the (m+1)th iteration and the number of steps decreased in the (m+1)th iteration. The number of steps increased is the number of steps V. x V is the number of steps reduced in the (m+2)th iteration. y Half of the sum of the (m+1)th increment. And so on.

[0141] Similarly, in steps 82 and 13, when the outlet water temperature T3 of the plate heat exchanger 7 is less than or equal to temperature B1℃ and greater than temperature B2℃, the step number V... z and steps V p, the dynamic value corresponding to the adjustment times can be selected according to the adjustment times, and the step number of the current adjustment is calculated according to the step number of the last adjustment.

[0142] For example, at the nth adjustment, the increased step number, i.e. the step number V z = V0, and the decreased step number, i.e. the step number V p = V1. n is a positive integer.

[0143] At the n+1th adjustment, the increased step number, i.e. the step number V z = (V0+V1) / 2, and the decreased step number, i.e. the step number V p = ((V0+V1) / 2+V1) / 2. That is, at the n+1th adjustment, the increased step number, i.e. the step number V z , is half of the sum of the n th increased step number and the n th decreased step number. The decreased step number, i.e. the step number V p , is half of the sum of the n+1th increased step number and the n th decreased step number.

[0144] At the n+2th adjustment, the increased step number, i.e. the step number V z = ((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2, and the decreased step number, i.e. the step number V p = (((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2+((V0+V1) / 2+V1) / 2) / 2. That is, at the n+2th adjustment, the increased step number, i.e. the step number V z , is half of the sum of the n+1th increased step number and the n th decreased step number. The decreased step number, i.e. the step number V p , is half of the sum of the n+2th increased step number and the n+1th decreased step number. The same applies to the subsequent adjustments.

[0145] For another example, during the adjustment process, when the increased step number, i.e. the step number V z = the decreased step number, i.e. the step number V p , for example, the increased step number, i.e. the step number V z = the decreased step number, i.e. the step number V p , after the m-1th adjustment, and m is a positive integer greater than or equal to 1. Then, the dynamic value of the step number V z and the step number V p is as follows:

[0146] At the mth adjustment, the decreased step number, i.e. the step number V p = V0, and the increased step number, i.e. the step number V z = V1. That is, at the mth adjustment, the increased step number and the decreased step number are interchanged in value.

[0147] At the m+1th adjustment, the decreased step number, i.e. the step number Vp = (V0+V1) / 2, the increased step number is step number V z = ((V0+V1) / 2+V1) / 2. That is, at the m+1th adjustment, the decreased step number is step number V p is half of the sum of the mth increased step number and the mth decreased step number. The increased step number is step number V z is the m+1th decreased step number, that is, step number V p is half of the sum of the mth increased step number. By analogy.

[0148] At the m+2th adjustment, the decreased step number is step number V p = ((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2, the increased step number is step number V z = (((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2+((V0+V1) / 2+V1) / 2) / 2. That is, at the m+2th adjustment, the decreased step number is step number V p is half of the sum of the m+1th increased step number and the m+1th decreased step number. The increased step number is step number V z is the m+2th decreased step number, that is, step number V p is half of the sum of the m+1th increased step number. By analogy.

[0149] By adopting the technical scheme of the embodiment, under the condition that the water source air conditioning system is running in the heating mode, according to the temperature interval in which the water inlet temperature of the plate heat exchanger is located, the exhaust temperature overhigh protection of the compressor and the low pressure overlow protection of the unit are selectively executed. In the exhaust temperature overhigh protection of the compressor, according to the temperature interval in which the exhaust temperature of the compressor is located, the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both increased, so as to realize the exhaust temperature overhigh protection of the compressor. In the low pressure overlow protection of the unit, according to the temperature interval in which the water outlet temperature of the plate heat exchanger is located, combined with the temperature interval in which the low pressure temperature value of the unit is located, the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both dynamically increased, so as to realize the low pressure protection of the unit. After the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both dynamically increased, in the case that the exhaust temperature of the compressor is reduced, the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both dynamically reduced, so as to realize the exhaust temperature overlow protection of the compressor. Therefore, by combining the water inlet temperature of the plate heat exchanger, the low pressure temperature value of the unit, and the exhaust temperature and exhaust superheat of the compressor, the exhaust temperature overhigh and overlow protection of the compressor and the low pressure overlow protection of the unit are realized, so as to ensure the reliability of the operation of the water source air conditioning system.

[0150] According to the embodiment of the present application, a control device of a water source air conditioning system corresponding to the control method of the water source air conditioning system is also provided. Referring to Figure 8 The structure diagram of an embodiment of the device of the present application is shown. The water source air conditioning system comprises a compressor 1, a four-way valve 3, an indoor heat exchanger, an outdoor heat exchanger, a subcooler 10, a heating electronic expansion valve 8, a subcooler electronic expansion valve 9, and a subcooler electromagnetic valve 11. The indoor heat exchanger is, for example, the heat exchanger of an indoor unit 18, an indoor unit 19, and an indoor unit 20. The outdoor heat exchanger is a plate heat exchanger 7. The plate heat exchanger 7 has a water heat exchange pipeline and a refrigerant heat exchange pipeline, and the water heat exchange pipeline and the refrigerant heat exchange pipeline can exchange heat. The four-way valve 3 has a first valve port, a second valve port, a third valve port, and a fourth valve port. The exhaust port of the compressor 1 is connected to the fourth valve port of the four-way valve 3, the first valve port of the four-way valve 3 is connected to the first port of the indoor heat exchanger, the second port of the indoor heat exchanger is divided into two paths through the first refrigerant pipeline of the subcooler 10: one path is connected to the third valve port of the four-way valve 3 through the heating electronic expansion valve 8 and the refrigerant heat exchange pipeline of the plate heat exchanger 7. The other path is connected to the second valve port of the four-way valve 3 through the bypass pipeline of the subcooler 10, the subcooler electronic expansion valve 9, the second refrigerant pipeline of the subcooler 10, and the subcooler electromagnetic valve 11. The other path is connected to the suction port of the compressor 1.

[0151] Specifically, Figure 9 The structure diagram of an embodiment of the water source air conditioning system is shown. As shown in Figure 9 The water source air conditioning system comprises a compressor 1, an oil separator 2, a four-way valve 3, an oil return electronic expansion valve 4, an exhaust temperature sensing bag 5, a high pressure sensor 6, a plate heat exchanger 7, a heating electronic expansion valve 8, a subcooler electronic expansion valve 9, a subcooler 10, a subcooler electromagnetic valve 11, a low pressure sensor 12, a plate heat exchanger inlet pipe temperature sensing bag 13, a plate heat exchanger outlet pipe temperature sensing bag 14, a gas-liquid separator 15, a gas pipe 16, a liquid pipe 17, an indoor unit 18, an indoor unit 19, an indoor unit 20, an indoor unit electronic expansion valve 21, an indoor unit electronic expansion valve 22, an indoor unit electronic expansion valve 23, an indoor unit fan 24, an indoor unit fan 25, and an indoor unit fan 26.

[0152] The exhaust port of the compressor 1 is communicated to the input port of the oil separator 2. The exhaust temperature sensing bulb 5 is arranged on the pipeline where the exhaust port of the compressor 1 is located. The first output port of the oil separator 2 is communicated to the fourth valve port of the four-way valve 3. The high-pressure sensor 6 is arranged on the pipeline where the first output port of the oil separator 2 is located. The second output port of the oil separator 2 is communicated to the suction port of the compressor 1 through the parallel-connected oil return electronic expansion valve 4 and the oil return capillary. The first valve port of the four-way valve 3 is communicated to the first port of the indoor unit 18, the first port of the indoor unit 19 and the first port of the indoor unit 20 through the air pipe 16. The first port of the indoor unit 18 is communicated to the second port of the indoor unit 20 through the indoor unit electronic expansion valve 21. The first port of the indoor unit 19 is communicated to the second port of the indoor unit 20 through the indoor unit electronic expansion valve 22. The first port of the indoor unit 20 is communicated to the second port of the indoor unit 20 through the indoor unit electronic expansion valve 23. The second port of the indoor unit 20 is communicated to the first port of the first heat exchange pipeline of the subcooler 10 through the liquid pipe 17. The second port of the first heat exchange pipeline of the subcooler 10 is communicated to the first port of the refrigerant heat exchange pipeline of the plate heat exchanger 7 through the heating electronic expansion valve 8. The second port of the first heat exchange pipeline of the subcooler 10 is communicated to the first port of the second heat exchange pipeline of the subcooler 10 through the subcooler electronic expansion valve 9. The second port of the second heat exchange pipeline of the subcooler 10 is communicated to the second valve port of the four-way valve 3 and the first port of the gas-liquid separator 15 through the subcooler solenoid valve 11. The second port of the gas-liquid separator 15 is communicated to the suction port of the compressor 1. The low-pressure sensor 12 is arranged on the pipeline before the subcooler solenoid valve 11 is communicated to the four-way valve 3 and the gas-liquid separator 15. The plate heat exchanger 7 has a water heat exchange pipeline and a refrigerant heat exchange pipeline, the water heat exchange pipeline and the refrigerant heat exchange pipeline can exchange heat, and the water heat exchange pipeline has a water inlet and a water outlet. The plate heat exchanger outlet pipe temperature sensing bulb 14 is arranged on the pipeline where the first port of the refrigerant heat exchange pipeline of the plate heat exchanger 7 is located. The second port of the refrigerant heat exchange pipeline of the plate heat exchanger 7 is communicated to the third valve port of the four-way valve 3. The control device of the water source air conditioning system comprises an acquisition unit 102 and a control unit 104.

[0153] The acquisition unit 102 is configured to acquire the water inlet temperature of the plate heat exchanger 7, such as the temperature at the water inlet of the water heat exchange pipeline of the plate heat exchanger 7, denoted as the water inlet temperature T1 of the plate heat exchanger 7, when the water source air conditioning system operates in the heating mode. The water outlet temperature of the plate heat exchanger 7 is acquired, such as the temperature at the water outlet of the water heat exchange pipeline of the plate heat exchanger 7, denoted as the water outlet temperature T3 of the plate heat exchanger 7. The discharge temperature of the compressor 1 is acquired, such as the temperature detected by the discharge temperature bulb 5 in the pipeline where the discharge port of the compressor 1 is located, denoted as the discharge temperature T2 of the compressor 1. The discharge superheat of the compressor 1 is acquired, such as determining the discharge superheat T5 of the compressor according to the discharge temperature T2 of the compressor 1, for example, the temperature difference between the discharge temperature T2 of the compressor 1 and the saturation temperature corresponding to the actual condensing pressure, denoted as the discharge superheat T5 of the compressor 1. The low-pressure temperature value before the pipeline where the subcooling electromagnetic valve 11 is located is divided into two paths, as the low-pressure temperature value of the water source air conditioning system, such as the low-pressure value detected by the low-pressure sensor 12 in the pipeline where one port of the subcooling electromagnetic valve 11 is located, and the low-pressure temperature value of the refrigerant in the water source air conditioning system is converted according to the corresponding relationship between the low-pressure value and the temperature value, denoted as the low-pressure temperature value T4 of the water source air conditioning system. The specific functions and processes of the acquisition unit 102 are described in step S110.

[0154] The control unit 104 is configured to realize at least one protection of the discharge temperature overprotection of the compressor 1, the discharge temperature underprotection of the compressor 1, and the low-pressure underprotection of the water source air conditioning system according to at least one of the water inlet temperature of the plate heat exchanger 7, the water outlet temperature of the plate heat exchanger 7, the discharge temperature of the compressor 1, the discharge superheat of the compressor 1, and the low-pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooling electronic expansion valve 9. The specific functions and processes of the control unit 104 are described in step S120.

[0155] The control device for balancing the low-pressure and discharge temperature of the water source air conditioning system during low-water-temperature heating according to the scheme of the present application realizes the discharge temperature overprotection and underprotection of the compressor and the low-pressure underprotection of the unit by combining the water inlet temperature of the plate heat exchanger, the low-pressure temperature value of the unit, and the discharge temperature and discharge superheat of the compressor, so that the core component of the water source multi-connected system, i.e., the plate heat exchanger, will not freeze, and the discharge temperature of the unit will not be too low to affect the operation of the water source air conditioning system.

[0156] In some embodiments, the control unit 104, based on at least one of the following: the inlet water temperature of the plate heat exchanger 7, the outlet water temperature of the plate heat exchanger 7, the discharge temperature of the compressor 1, the discharge superheat of the compressor 1, and the low-pressure temperature value of the water source air conditioning system, in conjunction with the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9, implements at least one of the following protections: overheating protection of the compressor 1's discharge temperature, underheating protection of the compressor 1's discharge temperature, and underpressure protection of the water source air conditioning system. These protections include:

[0157] The control unit 104 is further configured to determine whether the inlet water temperature of the plate heat exchanger 7 is greater than a first set inlet water temperature or less than a second set inlet water temperature, such as temperature X℃ and temperature Y℃. The specific functions and processing of the control unit 104 are further described in step S210.

[0158] The control unit 104 is further configured to, if it is determined that the inlet water temperature of the plate heat exchanger 7 is greater than a first set inlet water temperature, or if it is determined that the inlet water temperature of the plate heat exchanger 7 is less than or equal to the first set inlet water temperature and greater than a second set inlet water temperature, adjust the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 according to the discharge temperature of the compressor 1, so as to realize the overheat protection of the compressor 1's discharge temperature. The specific functions and processing of this control unit 104 are further described in step S220.

[0159] The control unit 104 is further configured to, if it is determined that the inlet water temperature of the plate heat exchanger 7 is less than or equal to a second set inlet water temperature, or if it is determined that the inlet water temperature of the plate heat exchanger 7 is less than or equal to a first set inlet water temperature and greater than a second set inlet water temperature, then, based on at least one of the following: the outlet water temperature of the plate heat exchanger 7, the exhaust superheat of the compressor 1, and the low-pressure temperature value of the water source air conditioning system, combined with the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9, implement at least one of the following protections: low-pressure protection of the water source air conditioning system and low exhaust temperature protection of the compressor 1. The specific functions and processing of this control unit 104 are further described in step S230.

[0160] Specifically, Figure 10 This is a schematic flowchart of an embodiment of a control device for balancing low pressure and exhaust temperature in a water source air conditioning system during low water temperature heating. Figure 11 This is a schematic flowchart of another embodiment of a control device for balancing low pressure and exhaust temperature in a water source air conditioning system during low water temperature heating. Figure 10 and Figure 11As shown, the water source air conditioning system according to the present application comprises a control device for balancing low pressure and exhaust temperature during low water temperature heating, which comprises:

[0161] Step 1: the water source air conditioning system is started to operate in heating mode, and then step 2 is performed.

[0162] Step 2: the water inlet temperature T1 of the plate heat exchanger 7 is obtained, and then step 3 is performed.

[0163] Step 3: it is determined whether the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature X ℃ or whether the water inlet temperature T1 of the plate heat exchanger 7 is less than temperature Y ℃, and step 4 or step 5 is selectively performed according to the determination result. Preferably, temperature X ℃ can be greater than 40 ℃, and preferably temperature Y ℃ is 20 ℃.

[0164] Specifically, if the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature X ℃, or the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature Y ℃ and less than or equal to temperature X ℃, step 4 is performed, that is, the exhaust temperature T2 of the compressor 1 is detected, and the compressor 1 is protected from high exhaust temperature.

[0165] If the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature Y ℃ and less than or equal to temperature X ℃, or the water inlet temperature T1 of the plate heat exchanger 7 is less than or equal to temperature Y ℃, step 5 is performed, that is, the water outlet temperature T3 of the plate heat exchanger 7 and the low pressure temperature value T4 of the water source air conditioning system are detected, and the water source air conditioning system is protected from low pressure overpressure.

[0166] In the case where the water inlet temperature T1 of the plate heat exchanger 7 is greater than temperature Y ℃ and less than or equal to temperature X ℃, the compressor 1 is simultaneously protected from high exhaust temperature and the water source air conditioning system is protected from low pressure overpressure, and the corresponding control logic is adopted.

[0167] In some embodiments, the control unit 104, in the case where the water inlet temperature of the plate heat exchanger 7 is greater than a first set water inlet temperature, or the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than a second set water inlet temperature, adjusts the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 according to the exhaust temperature of the compressor 1 to realize high exhaust temperature protection of the compressor 1, comprising:

[0168] The control unit 104 is specifically further configured to determine whether the exhaust temperature of the compressor 1 is greater than a first set exhaust temperature for a first set time: if yes, increase the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 by a first set number of steps. Otherwise, control the water source air conditioning system to operate according to the preset normal control parameters, for example, control the water source air conditioning system to operate according to the preset normal control parameters in the heating mode. The first set time is, for example, 10s, and the first set exhaust temperature is, for example, temperature A1℃. For specific functions and processes of the control unit 104, see step S310.

[0169] The control unit 104 is specifically further configured to, after increasing the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 by the first set number of steps, control the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are increased by the first set number of steps. And determine whether the exhaust temperature of the compressor 1 is greater than a second set exhaust temperature for a first set time: if yes, increase the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 by a second set number of steps. Otherwise, continue to control the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are increased by the first set number of steps. Wherein, the second set exhaust temperature is greater than the first set exhaust temperature, and the second set number of steps is greater than the first set number of steps. The second set exhaust temperature is, for example, temperature A2℃. For specific functions and processes of the control unit 104, see step S320.

[0170] The control unit 104 is specifically further configured to, after increasing the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 by the second set number of steps, control the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are increased by the second set number of steps. And determine whether the exhaust temperature of the compressor 1 is greater than a third set exhaust temperature for a second set time: if yes, control the water source air conditioning system to stop operating. Otherwise, continue to control the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 are increased by the second set number of steps. Wherein, the second set time is less than the first set time, and the third set exhaust temperature is greater than the second set exhaust temperature. The third set exhaust temperature is, for example, temperature A3℃. For specific functions and processes of the control unit 104, see step S330.

[0171] The control unit 104 is further configured to determine whether the discharge temperature of the compressor 1 is less than a fourth set discharge temperature for a continuous third set time after the water source air conditioning system is controlled to stop running, and if so, control the water source air conditioning system to resume running, and then return to re-implement at least one of the protection of the discharge temperature of the compressor 1 being too high, the protection of the discharge temperature of the compressor 1 being too low, and the protection of the low pressure of the water source air conditioning system being too low according to at least one of the inlet water temperature of the plate heat exchanger 7, the outlet water temperature of the plate heat exchanger 7, the discharge temperature of the compressor 1, the discharge superheat of the compressor 1, and the low pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooling electronic expansion valve 9. Otherwise, the water source air conditioning system is controlled to maintain the state of stopping running. The third set time is greater than the first set time, and the fourth set discharge temperature is less than the first set discharge temperature. The third set time is, for example, 3 min, and the fourth set discharge temperature is, for example, temperature A4℃. The specific functions and processes of the control unit 104 are also described in step S340.

[0172] Specifically, as shown in Figure 10 and Figure 11 The water source air conditioning system provided by the scheme of the present application also includes:

[0173] Step 4, in the case that the inlet water temperature T1 of the plate heat exchanger 7 is greater than temperature X℃, or the inlet water temperature T1 of the plate heat exchanger 7 is greater than temperature Y℃ and less than or equal to temperature X℃, the discharge temperature T2 of the compressor 1 is detected, which can be specifically obtained by detecting the temperature of the exhaust temperature sensing package 5 in the pipeline where the discharge port of the compressor 1 is located, and recorded as the discharge temperature T2 of the compressor 1. Then, according to the discharge temperature T2 of the compressor 1, the following steps such as steps 41 to 47 are executed to perform the protection of the discharge temperature of the compressor 1 being too high.

[0174] Step 41, determine whether the discharge temperature T2 of the compressor 1 is greater than temperature A1℃ for a continuous 10s, and if so, execute step 42, otherwise the parameters of the water source air conditioning system are controlled according to the normal control parameters in the heating mode. Preferably, temperature A1℃ is 90℃-95℃.

[0175] Step 42, increase the opening degree of the subcooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 by a step number V1, and then execute step 43.

[0176] Step 43, judging whether the discharge temperature T2 of the compressor 1 is greater than temperature A2℃ for 10s continuously: if yes, executing step 44, otherwise, the parameters of the water source air conditioning system are controlled according to the last adjusted control parameters in the heating mode, if not adjusted last time, the parameters of the water source air conditioning system are actually still controlled according to the normal control parameters in the heating mode. Preferably, the temperature A2℃ is 95℃-100℃.

[0177] Step 44, increasing the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 by step V2, and then executing step 45.

[0178] Step 45, judging whether the discharge temperature T2 of the compressor 1 is greater than temperature A3℃ for 3s continuously: if yes, executing step 46, otherwise, the parameters of the water source air conditioning system are controlled according to the last adjusted control parameters in the heating mode, if not adjusted last time, the parameters of the water source air conditioning system are actually still controlled according to the normal control parameters in the heating mode. Preferably, the temperature A3℃ is above 100℃.

[0179] Step 46, after controlling the whole machine of the water source air conditioning system to stop running, judging whether the discharge temperature T2 of the compressor 1 is less than temperature A4℃ for 3min continuously: if yes, executing step 47, otherwise, the whole machine of the water source air conditioning system maintains the state of stop. Preferably, the temperature A4℃ is 85℃-90℃.

[0180] Step 47, controlling the whole machine of the water source air conditioning system to resume running, and then returning to at least one of step 41, step 43 and step 45.

[0181] In some embodiments, the control unit 104, in the case that the water inlet temperature of the plate heat exchanger 7 is less than or equal to the second set water inlet temperature, or the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, realizes at least one of the low-pressure over-low protection of the water source air conditioning system and the discharge temperature over-low protection of the compressor 1 according to at least one of the water outlet temperature of the plate heat exchanger 7, the discharge superheat of the compressor 1 and the low-pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9, including:

[0182] The control unit 104 is specifically further configured to determine whether the water outlet temperature of the plate heat exchanger 7 is greater than the first set water outlet temperature or less than the second set water outlet temperature, the first set water outlet temperature being, for example, temperature B1℃, and the second set water outlet temperature being, for example, temperature B2℃. The specific functions and processes of the control unit 104 are also referred to step S410.

[0183] The control unit 104 is further configured to, if it is determined that the outlet water temperature of the plate heat exchanger 7 is greater than the first set outlet water temperature, or it is determined that the outlet water temperature of the plate heat exchanger 7 is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, implement at least one of low pressure over protection of the water source air conditioning system and exhaust temperature over protection of the compressor 1 according to at least one of the low pressure temperature value of the water source air conditioning system and the exhaust superheat of the compressor 1, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9. The specific functions and processes of the control unit 104 are also described in step S420.

[0184] The control unit 104 is further configured to, if it is determined that the outlet water temperature of the plate heat exchanger 7 is less than or equal to the second set outlet water temperature, implement low pressure over protection of the water source air conditioning system according to the low pressure temperature value of the water source air conditioning system. The specific functions and processes of the control unit 104 are also described in step S430.

[0185] Specifically, as shown in Figure 10 and Figure 11 The water source air conditioning system provided by the scheme of the present application also includes:

[0186] Step 5: In the case that the inlet water temperature T1 of the plate heat exchanger 7 is greater than temperature Y℃ and less than or equal to temperature X℃, or the inlet water temperature T1 of the plate heat exchanger 7 is less than or equal to temperature Y℃, the outlet water temperature T3 of the plate heat exchanger 7 and the low pressure temperature value T4 of the water source air conditioning system are detected. Further, according to the outlet water temperature T3 of the plate heat exchanger 7 and the low pressure temperature value T4 of the water source air conditioning system, the following step, i.e. step 6, is executed to perform low pressure over protection on the water source air conditioning system.

[0187] Step 6: It is judged whether the outlet water temperature T3 of the plate heat exchanger 7 is greater than temperature B1℃ or the outlet water temperature T3 of the plate heat exchanger 7 is less than temperature B2℃, and step 7 or step 8 or step 9 is selectively executed according to the judgment result. Preferably, temperature B1℃ is 10℃, and preferably, temperature B2℃ is 5℃.

[0188] Specifically, if the outlet water temperature T3 of the plate heat exchanger 7 is greater than temperature B1℃, step 7 is executed, i.e. low pressure over protection is performed on the water source air conditioning system according to the low pressure temperature value T4 of the water source air conditioning system.

[0189] If the outlet water temperature T3 of the plate heat exchanger 7 is less than or equal to temperature B1℃ and greater than temperature B2℃, step 8 is executed, i.e. low pressure over protection is performed on the water source air conditioning system according to the low pressure temperature value T4 of the water source air conditioning system.

[0190] If the water outlet temperature T3 of the plate heat exchanger 7 is less than or equal to the temperature B2℃, step 9 is performed, i.e. low pressure overpressure protection is performed on the water source air conditioning system according to the low pressure temperature value T4 of the water source air conditioning system.

[0191] In some embodiments, the control unit 104, in the case that the water inlet temperature of the plate heat exchanger 7 is less than or equal to the second set water inlet temperature, or the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, if it is determined that the water outlet temperature of the plate heat exchanger 7 is greater than the first set water outlet temperature, or it is determined that the water outlet temperature of the plate heat exchanger 7 is greater than the second set water outlet temperature and less than or equal to the first set water outlet temperature, at least one of the low pressure overpressure protection of the water source air conditioning system and the discharge temperature overpressure protection of the compressor 1 is realized according to at least one of the low pressure temperature value of the water source air conditioning system and the discharge superheat of the compressor 1, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9, including: a first process of realizing the low pressure overpressure protection of the water source air conditioning system according to the low pressure temperature value of the water source air conditioning system and the first set low pressure temperature.

[0192] The control unit 104 is further configured to, if it is determined that the water outlet temperature of the plate heat exchanger 7 is greater than the first set water outlet temperature, determine whether the low pressure temperature value of the water source air conditioning system is less than the first set low pressure temperature for a continuous fourth set time: if yes, the water source air conditioning system is controlled to increase the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9 by the first set dynamic step increase value. Otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system. The fourth set time is, for example, 5 min, the first set low pressure temperature is, for example, temperature C1℃, and the first set dynamic step increase value is, for example, step number V x . The specific functions and processes of the control unit 104 are also described in step S510.

[0193] The control unit 104 is further configured to control the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 are both increased by the first set dynamic step increase value, based on the superheat degree of the discharge of the compressor 1, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9, to realize the protection of the low temperature of the discharge of the compressor 1. In addition, it is determined whether the low pressure temperature value of the water source air conditioning system is less than the difference between the first set low pressure temperature and the set temperature for a continuous fourth set time. If yes, the compressor 1 is controlled to stop operating. Otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system, i.e., the water source air conditioning system is controlled to continue operating according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 are both increased by the first set dynamic step increase value. The specific functions and processes of the control unit 104 are also described in steps S520.

[0194] Specifically, as shown in Figure 10 and Figure 11 , the water source air conditioning system provided by the scheme of the present application also includes:

[0195] Step 7, in the case that the outlet water temperature T3 of the plate heat exchanger 7 is greater than temperature B1℃, according to the low pressure temperature value T4 of the water source air conditioning system, the following steps are executed, i.e., steps 71 to 74, to perform the low pressure overpressure protection of the water source air conditioning system.

[0196] Step 71, it is determined whether the low pressure temperature value T4 of the water source air conditioning system detected for a continuous 5 min is less than temperature C1℃. If yes, step 72 is executed, otherwise, step 74 is executed. Preferably, temperature C1℃ is 2℃.

[0197] Step 72, the opening degree of the supercooler electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both increased by a step number V x , and then step 73 is executed.

[0198] Step 73, it is determined whether the low pressure temperature value T4 of the water source air conditioning system detected for a continuous 5 min is less than temperature (C1-5)℃. If yes, the compressor 1 is controlled to stop operating, otherwise, step 74 is executed.

[0199] Step 74, the water source air conditioning system is controlled to maintain the current control parameters to continue operating, and then step 10 is executed, i.e., according to the discharge temperature T2 of the compressor 1, the superheat degree T5 of the discharge of the compressor is determined to perform the protection of the low temperature of the discharge of the compressor 1.

[0200] In some embodiments, the control unit 104, in the case that the water inlet temperature of the plate heat exchanger 7 is less than or equal to the second set water inlet temperature, or the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, if it is determined that the water outlet temperature of the plate heat exchanger 7 is greater than the first set water outlet temperature, or it is determined that the water outlet temperature of the plate heat exchanger 7 is greater than the second set water outlet temperature and less than or equal to the first set water outlet temperature, then according to at least one of the low pressure temperature value of the water source air conditioning system and the discharge superheat of the compressor 1, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9, at least one protection of low pressure over low protection of the water source air conditioning system and discharge temperature over low protection of the compressor 1 is realized, and the second process of realizing the low pressure over low protection of the water source air conditioning system according to the low pressure temperature value of the water source air conditioning system and the second set low pressure temperature is further included.

[0201] The control unit 104 is further configured to, if it is determined that the water outlet temperature of the plate heat exchanger 7 is greater than the second set water outlet temperature and less than or equal to the first set water outlet temperature, determine whether the low pressure temperature value of the water source air conditioning system is less than the second set low pressure temperature continuously for a fourth set time; if yes, the water source air conditioning system is controlled to increase the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 by a second set dynamic step increase value. Otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system. The second set low pressure temperature is greater than the first set low pressure temperature. The fourth set time is, for example, 5 minutes, the second set low pressure temperature is, for example, temperature C2℃, and the second set dynamic step increase value is, for example, step number V. z The specific functions and processes of the control unit 104 are further described in step S610.

[0202] The control unit 104 is further configured to control the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 are both increased by the second set dynamic step increase value. According to the discharge superheat of the compressor 1, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9, the discharge temperature of the compressor 1 is protected. In addition, it is determined whether the low pressure temperature value of the water source air conditioning system is less than the difference between the second set low pressure temperature and the set temperature for a continuous fourth set time. If yes, the compressor 1 is controlled to stop operating. Otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system, i.e., the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 are both increased by the second set dynamic step increase value. The specific functions and processes of the control unit 104 are also described in step S620.

[0203] Specifically, as shown in Figure 10 and Figure 11 , the water source air conditioning system provided by the scheme of the present application also includes:

[0204] Step 8, in the case that the outlet water temperature T3 of the plate heat exchanger 7 is less than or equal to temperature B1℃ and greater than temperature B2℃, according to the low pressure temperature value T4 of the water source air conditioning system, the following steps are executed, i.e., steps 81 to 84, to perform low pressure overpressure protection on the water source air conditioning system.

[0205] Step 81, it is determined whether the low pressure temperature value T4 of the water source air conditioning system detected for a continuous 5 min is less than temperature C2℃. If yes, step 82 is executed, otherwise, step 84 is executed. Preferably, temperature C2℃ is 5℃.

[0206] Step 82, the opening degree of the supercooler electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both increased by a step number V z , and then step 83 is executed.

[0207] Step 83, it is determined whether the low pressure temperature value T4 of the water source air conditioning system detected for a continuous 5 min is less than temperature (C2-5)℃. If yes, the compressor 1 is controlled to stop operating, otherwise, step 84 is executed.

[0208] Step 84, the water source air conditioning system is controlled to maintain the current control parameters to continue operating, and then step 10 is executed, i.e., according to the discharge temperature T2 of the compressor 1, the discharge superheat T5 of the compressor is determined to protect the discharge temperature of the compressor 1 from being too low.

[0209] In some embodiments, the control unit 104, in the case that the water inlet temperature of the plate heat exchanger 7 is less than or equal to the second set water inlet temperature, or the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, if it is determined that the water outlet temperature of the plate heat exchanger 7 is less than or equal to the second set water outlet temperature, then according to the low pressure temperature value of the water source air conditioning system, the low pressure over low protection of the water source air conditioning system is realized, including:

[0210] The control unit 104 is specifically further configured to, if it is determined that the water outlet temperature of the plate heat exchanger 7 is less than or equal to the second set water outlet temperature, in the case that it is determined that the low pressure temperature value of the water source air conditioning system is less than the third set low pressure temperature for a continuous first set time, control the compressor 1 to stop running. The third set low pressure temperature is less than the first set low pressure temperature, and the third set low pressure temperature is, for example, temperature C3℃.

[0211] Specifically, as shown in Figure 10 and Figure 11 The control device for balancing low pressure and discharge temperature of the water source air conditioning system in low water temperature heating according to the scheme of the present application further includes:

[0212] Step 9, in the case that the water outlet temperature T3 of the plate heat exchanger 7 is less than or equal to temperature B2℃, according to the low pressure temperature value T4 of the water source air conditioning system, the following steps, such as steps 91 to 92, are performed to perform low pressure over pressure protection on the water source air conditioning system.

[0213] Step 91, determine whether the low pressure temperature value T4 of the water source air conditioning system detected continuously for 10s is less than temperature C3℃: if yes, execute step 92, otherwise control the water source air conditioning system to maintain the current control parameters and continue running. Preferably, temperature C3℃ is 0℃.

[0214] Step 92, control the compressor 1 to stop running.

[0215] In some embodiments, the control unit 104, in the case that the water inlet temperature of the plate heat exchanger 7 is less than or equal to the second set water inlet temperature, or the water inlet temperature of the plate heat exchanger 7 is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, and in the case that the water outlet temperature of the plate heat exchanger 7 is greater than the first set water outlet temperature, or the water outlet temperature of the plate heat exchanger 7 is greater than the second set water outlet temperature and less than or equal to the first set water outlet temperature, according to the discharge superheat of the compressor 1, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the subcooler electronic expansion valve 9, the discharge temperature over low protection of the compressor 1 is realized, including any one of the following discharge temperature over low protection situations:

[0216] The first exhaust temperature protection case: the control unit 104 is further configured to, in the case that the water outlet temperature of the plate heat exchanger 7 is greater than the first set water outlet temperature, reduce the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 by the first set dynamic step reduction value, and then control the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 are reduced by the first set dynamic step reduction value, and then return to re-achieve at least one of the exhaust temperature protection of the compressor 1, the exhaust temperature protection of the compressor 1, and the low pressure protection of the water source air conditioning system according to at least one of the water inlet temperature of the plate heat exchanger 7, the water outlet temperature of the plate heat exchanger 7, the exhaust temperature of the compressor 1, the exhaust superheat of the compressor 1, and the low pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9. The first set dynamic step reduction value is, for example, step V y .

[0217] The first set dynamic step increase value and the first set dynamic step reduction value are dynamically calculated according to the number of adjustments of the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9. The first set dynamic step increase value and the first set dynamic step reduction value in the current adjustment are calculated according to the first set dynamic step increase value and the first set dynamic step reduction value in the last adjustment.

[0218] The second exhaust temperature protection case: the control unit 104 is further configured to, in the case that the water outlet temperature of the plate heat exchanger 7 is greater than the second set water outlet temperature and less than or equal to the first set water outlet temperature, reduce the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 by the second set dynamic step reduction value, and then control the water source air conditioning system to operate according to the control parameters after the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9 are reduced by the second set dynamic step reduction value, and then return to re-achieve at least one of the exhaust temperature protection of the compressor 1, the exhaust temperature protection of the compressor 1, and the low pressure protection of the water source air conditioning system according to at least one of the water inlet temperature of the plate heat exchanger 7, the water outlet temperature of the plate heat exchanger 7, the exhaust temperature of the compressor 1, the exhaust superheat of the compressor 1, and the low pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9. The second set dynamic step reduction value is, for example, step V p .

[0219] The second set dynamic step increase value and the second set dynamic step decrease value are dynamically calculated according to the adjustment times of the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooling electronic expansion valve 9, and the second set dynamic step increase value and the second set dynamic step decrease value in the current adjustment are calculated according to the second set dynamic step increase value and the second set dynamic step decrease value in the last adjustment.

[0220] Specifically, as shown in Figure 10 and Figure 11 , the water source air conditioning system provided by the scheme of the present application further comprises:

[0221] Step 10, when the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are increased by the step number, the low-pressure overpressure protection of the water source air conditioning system is entered, and the exhaust temperature of the compressor 1 is protected, that is, the following steps are executed to protect the exhaust temperature of the compressor 1.

[0222] Step 11, the exhaust superheat T5 of the compressor 1 is determined according to the exhaust temperature T2 of the compressor 1, and then step 12 or step 13 is executed.

[0223] Step 12, when the exhaust superheat T5 of the compressor 1 is less than temperature D ℃, the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both decreased by the step number V y . Preferably, D ℃ is 30-35 ℃.

[0224] In step 72, the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both increased by the step number V x , and in step 12, the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both decreased by the step number V y . The values of the step number V x and the step number V y are dynamic, that is, when the outlet water temperature T3 of the plate heat exchanger 7 is greater than temperature B1 ℃, the increase or decrease of the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 is dynamically adjusted to ensure that the low-pressure protection and the exhaust temperature too low do not occur under the condition of low-temperature heating.

[0225] Step 13, when the exhaust superheat T5 of the compressor 1 is less than temperature D ℃, the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both decreased by the step number V p .

[0226] wherein the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both increased by a step number V in step 82 z , the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 are both decreased by a step number V in step 13 p . The step number V z and the step number V p are dynamically determined, i.e. in the case that the outlet water temperature T3 of the plate heat exchanger 7 is less than or equal to the temperature B1℃ and greater than the temperature B2℃, the adjustment of the increase or decrease of the opening degree of the supercooling electronic expansion valve 9 and the opening degree of the heating electronic expansion valve 8 is dynamically adjusted to ensure that the low pressure protection condition does not occur and the exhaust temperature is not too low under the low temperature heating condition.

[0227] In some embodiments, the control unit 104 dynamically calculates a first set dynamic step number increase value and a first set dynamic step number decrease value according to the number of adjustments of the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooling electronic expansion valve 9, comprising:

[0228] The control unit 104 is specifically configured to set the first set dynamic step number increase value at the nth adjustment as an initial set step number, such as the step number V0. The first set dynamic step number decrease value at the nth adjustment is a first set step number. n is a positive integer. The specific functions and processes of the control unit 104 are also described in step S710.

[0229] The control unit 104 is specifically configured to set the first set dynamic step number increase value at the nth+1 adjustment as half of the sum of the first set dynamic step number increase value at the nth adjustment and the first set dynamic step number decrease value. The first set dynamic step number decrease value at the nth+1 adjustment is half of the sum of the first set dynamic step number increase value at the nth+1 adjustment and the first set dynamic step number decrease value at the nth adjustment. The specific functions and processes of the control unit 104 are also described in step S720.

[0230] The control unit 104 is specifically configured to exchange the first set dynamic step number increase value and the first set dynamic step number decrease value at the mth and subsequent adjustments if the first set dynamic step number increase value at the m-1th adjustment is equal to the first set dynamic step number decrease value during the adjustment process. m is a positive integer and m is less than or equal to n. The specific functions and processes of the control unit 104 are also described in step S730.

[0231] The control unit 104 calculates the second set dynamic step increase value and the second set dynamic step decrease value in the same way as the first set dynamic step increase value and the first set dynamic step decrease value are calculated based on the number of adjustments of the opening degree of the heating electronic expansion valve 8 and the opening degree of the supercooler electronic expansion valve 9.

[0232] Specifically, as shown in Figure 10 and Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 Figure 10 Figure 11 , the water source air conditioning system according to the present application further comprises:

[0233] In step 72 and step 12, when the outlet water temperature T3 of the plate heat exchanger 7 is greater than temperature B1℃, the step number V x and the step number V y may be selected according to the dynamic value at the corresponding adjustment number, and the step number of the current adjustment is calculated based on the step number of the last adjustment.

[0234] For example, in the nth adjustment, the increased step number V x = V0, and the decreased step number V y = V1. n is a positive integer.

[0235] In the n+1th adjustment, the increased step number V x = (V0+V1) / 2, and the decreased step number V

[0236] V y = ((V0+V1) / 2+V1) / 2. That is, in the n+1th adjustment, the increased step number V x is half of the sum of the nth increased step number and the nth decreased step number. The decreased step number V y is half of the sum of the n+1th increased step number and the nth decreased step number.

[0237] In the n+2th adjustment, the increased step number V x = ((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2, and the decreased step number V y = (((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2+((V0+V1) / 2+V1) / 2) / 2. That is, in the n+2th adjustment, the increased step number V x is half of the sum of the n+1th increased step number and the nth decreased step number. The decreased step number V yIt is half the sum of the number of steps added in the (n+2)th iteration and the number of steps removed in the (n+1)th iteration. And so on.

[0238] For example: during the adjustment process, when the number of steps increased, i.e., the number of steps V... x = The number of steps reduced, i.e., the number of steps V y For example, the number of steps V added after the (m-1)th adjustment. x = The number of steps reduced, i.e., the number of steps V y Let m be a positive integer greater than or equal to 1. Then, the next step is V. x and number of steps V y The dynamic value retrieval method is as follows:

[0239] The number of steps reduced during the m-th adjustment is the step count V. y =V0, the number of steps added is V. x =V1. That is, the number of steps increased and decreased in the m-th adjustment are interchanged.

[0240] The number of steps reduced during the (m+1)th adjustment is the number of steps V. y = (V0 + V1) / 2, where the number of steps is V. x = ((V0+V1) / 2+V1) / 2. That is, in the (m+1)th adjustment, the number of steps reduced is the number of steps V. y It is half the sum of the number of steps increased in the m-th iteration and the number of steps decreased in the m-th iteration. The number of steps increased is the number of steps V. x V is the number of steps reduced in the (m+1)th iteration. y Half of the sum of the number of steps increased in the m-th increment.

[0241] In the (m+2)th adjustment, the number of steps reduced is the number of steps V. y = ((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2, where the number of steps added is the number of steps V. x = (((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2+((V0+V1) / 2+V1) / 2) / 2. That is, in the (m+2)th adjustment, the number of steps reduced is the number of steps V. y It is half the sum of the number of steps increased in the (m+1)th iteration and the number of steps decreased in the (m+1)th iteration. The number of steps increased is the number of steps V. x V is the number of steps reduced in the (m+2)th iteration. y Half of the sum of the (m+1)th increment. And so on.

[0242] Similarly, in steps 82 and 13, when the outlet water temperature T3 of the plate heat exchanger 7 is less than or equal to temperature B1℃ and greater than temperature B2℃, the step number V... z and steps V p, the dynamic value of the step number V at the corresponding adjustment times can be selected according to the adjustment times, and the step number of the current adjustment is calculated according to the step number of the last adjustment.

[0243] For example, at the nth adjustment, the increased step number V z = V0, and the decreased step number V p = V1. n is a positive integer.

[0244] At the (n+1)th adjustment, the increased step number V z = (V0+V1) / 2, and the decreased step number V

[0245] V p = ((V0+V1) / 2+V1) / 2. That is, at the (n+1)th adjustment, the increased step number V z is half of the sum of the increased step number at the nth adjustment and the decreased step number at the nth adjustment. The decreased step number V p is half of the sum of the increased step number at the (n+1)th adjustment and the decreased step number at the nth adjustment.

[0246] At the (n+2)th adjustment, the increased step number V z = ((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2, and the decreased step number V p = (((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2+((V0+V1) / 2+V1) / 2) / 2. That is, at the (n+2)th adjustment, the increased step number V z is half of the sum of the increased step number at the (n+1)th adjustment and the decreased step number at the nth adjustment. The decreased step number V p is half of the sum of the increased step number at the (n+2)th adjustment and the decreased step number at the (n+1)th adjustment. The same applies to the subsequent adjustments.

[0247] For another example, during the adjustment process, when the increased step number V z = the decreased step number V p , for example, the increased step number V z = the decreased step number V p after the (m-1)th adjustment, m is a positive integer greater than or equal to 1. Then, next, the dynamic value of the step number V z and the step number V p is as follows:

[0248] At the mth adjustment, the decreased step number V p = V0, and the increased step number V z = V1. That is, at the mth adjustment, the increased step number and the decreased step number are exchanged in value.

[0249] The step number Vm+1 to be reduced at the m+1th adjustment p = (V0+V1) / 2, the step number Vm+1 to be increased z = ((V0+V1) / 2+V1) / 2. That is, the step number Vm+1 to be reduced at the m+1th adjustment p is half of the sum of the step number Vm to be increased and the step number Vm to be reduced. The step number Vm+1 to be increased z is the step number Vm+1 to be reduced p is half of the sum of the step number Vm+1 to be increased and the step number Vm to be reduced.

[0250] The step number Vm+2 to be reduced at the m+2th adjustment p = ((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2, the step number Vm+2 to be increased z = (((V0+V1) / 2+((V0+V1) / 2+V1) / 2) / 2+((V0+V1) / 2+V1) / 2) / 2. That is, the step number Vm+2 to be reduced at the m+2th adjustment p is half of the sum of the step number Vm+1 to be increased and the step number Vm+1 to be reduced. The step number Vm+2 to be increased z is the step number Vm+2 to be reduced p is half of the sum of the step number Vm+2 to be increased and the step number Vm to be reduced. By analogy.

[0251] Since the processing and functions realized by the device of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the present embodiment will not be elaborated on the unexplained parts, which can be seen in the foregoing embodiments.

[0252] The technical scheme of the present application is adopted to selectively execute the over-high exhaust temperature protection of the compressor and the over-low low-pressure protection of the unit according to the temperature range of the water inlet temperature of the plate heat exchanger when the water source air conditioning system is operated in the heating mode; in the over-high exhaust temperature protection of the compressor, the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both increased according to the temperature range of the exhaust temperature of the compressor to realize the over-high exhaust temperature protection of the compressor; in the over-low low-pressure protection of the unit, the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both dynamically increased according to the temperature range of the water outlet temperature of the plate heat exchanger in combination with the temperature range of the low-pressure temperature value of the unit to realize the low-pressure protection of the unit; after the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both dynamically increased, the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both dynamically decreased when the exhaust temperature of the compressor is reduced to realize the over-low exhaust temperature protection of the compressor, so that the core component of the water source multi-connected unit, i.e., the plate heat exchanger, will not freeze, and the exhaust temperature of the unit will not be too low to affect the operation of the water source air conditioning system.

[0253] According to the embodiment of the present application, a water source air conditioning system corresponding to the control device of the water source air conditioning system is also provided.

[0254] Since the processing and functions realized by the water source air conditioning system of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing device, the description of the present embodiment will not be elaborated here, and the related description in the foregoing embodiments can be referred to.

[0255] The technical scheme of the present application is adopted to selectively execute the over-high exhaust temperature protection of the compressor and the over-low low-pressure protection of the unit according to the temperature range of the water inlet temperature of the plate heat exchanger when the water source air conditioning system is operated in the heating mode; in the over-high exhaust temperature protection of the compressor, the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both increased according to the temperature range of the exhaust temperature of the compressor to realize the over-high exhaust temperature protection of the compressor; in the over-low low-pressure protection of the unit, the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both dynamically increased according to the temperature range of the water outlet temperature of the plate heat exchanger in combination with the temperature range of the low-pressure temperature value of the unit to realize the low-pressure protection of the unit; after the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both dynamically increased, the opening degree of the supercooling electronic expansion valve and the opening degree of the heating electronic expansion valve are both dynamically decreased when the exhaust temperature of the compressor is reduced to realize the over-low exhaust temperature protection of the compressor, so that the core component of the water source multi-connected unit, i.e., the plate heat exchanger, will not freeze, and the exhaust temperature of the unit will not be too low to affect the operation of the water source air conditioning system.

[0256] According to the embodiment of the present application, a storage medium corresponding to the control method of the water source air conditioning system is also provided, which comprises a stored program, wherein when the program is executed, the device where the storage medium is located performs the control method of the water source air conditioning system described above.

[0257] Since the processing and functions realized by the storage medium of the present embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, the description of the present embodiment does not elaborate on the related descriptions in the foregoing embodiments, which are not repeated here.

[0258] By using the technical solution of the present application, in the case that the water source air conditioning system is running in the heating mode, the discharge temperature over high protection of the compressor and the low pressure over low protection of the unit are selectively executed according to the temperature interval of the water inlet temperature of the plate heat exchanger; in the discharge temperature over high protection of the compressor, the opening of the supercooling electronic expansion valve and the opening of the heating electronic expansion valve are both increased according to the temperature interval of the discharge temperature of the compressor, so as to realize the discharge temperature over high protection of the compressor; in the low pressure over low protection of the unit, the opening of the supercooling electronic expansion valve and the opening of the heating electronic expansion valve are both dynamically increased according to the temperature interval of the water outlet temperature of the plate heat exchanger in combination with the temperature interval of the low pressure temperature value of the unit, so as to realize the low pressure protection of the unit; after the opening of the supercooling electronic expansion valve and the opening of the heating electronic expansion valve are both dynamically increased, in the case that the discharge temperature of the compressor is reduced, the opening of the supercooling electronic expansion valve and the opening of the heating electronic expansion valve are both dynamically reduced, so as to realize the discharge temperature over low protection of the compressor, so that the core component of the water source multi-connected system, i.e. the plate heat exchanger, will not freeze, and the reliability of the water source air conditioning system is improved.

[0259] In summary, those skilled in the art can easily understand that the above advantageous modes can be freely combined and superimposed without conflict.

[0260] The above description is only an embodiment of the present application and is not used to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A control method of a water source air conditioning system, characterized by, The water source air conditioning system comprises a compressor (1), a four-way valve (3), an indoor heat exchanger, an outdoor heat exchanger, a supercooler (10), a heating electronic expansion valve (8), a supercooler electronic expansion valve (9) and a supercooler electromagnetic valve (11); the outdoor heat exchanger adopts a plate heat exchanger (7); wherein the exhaust port of the compressor (1) is communicated to the fourth valve port of the four-way valve (3), the first valve port of the four-way valve (3) is communicated to the first port of the indoor heat exchanger, the second port of the indoor heat exchanger is divided into two paths after the first refrigerant pipeline of the supercooler (10), one path is communicated to the third valve port of the four-way valve (3) after the refrigerant heat exchange pipeline of the heating electronic expansion valve (8) and the plate heat exchanger (7), and the other path is communicated to the second valve port of the four-way valve (3) after the bypass pipeline of the supercooler (10), the supercooler electronic expansion valve (9), the second refrigerant pipeline of the supercooler (10) and the supercooler electromagnetic valve (11); the control method of the water source air conditioning system comprises: In the case that the water source air conditioning system operates in the heating mode, the water inlet temperature of the plate heat exchanger (7) is obtained; the water outlet temperature of the plate heat exchanger (7) is obtained; the exhaust temperature of the compressor (1) is obtained; the exhaust superheat of the compressor (1) is obtained; and the low-pressure temperature value before the pipeline of the supercooler electromagnetic valve (11) is divided into two paths is obtained as the low-pressure temperature value of the water source air conditioning system; At least one of the water inlet temperature of the plate heat exchanger (7), the water outlet temperature of the plate heat exchanger (7), the exhaust temperature of the compressor (1), the exhaust superheat of the compressor (1) and the low-pressure temperature value of the water source air conditioning system is combined with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) to realize at least one of the exhaust temperature overprotection of the compressor (1), the exhaust temperature underprotection of the compressor (1) and the low-pressure underprotection of the water source air conditioning system.

2. The control method of a water-source air-conditioning system according to claim 1, characterized by, At least one of the water inlet temperature of the plate heat exchanger (7), the water outlet temperature of the plate heat exchanger (7), the exhaust temperature of the compressor (1), the exhaust superheat of the compressor (1) and the low-pressure temperature value of the water source air conditioning system is combined with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) to realize at least one of the exhaust temperature overprotection of the compressor (1), the exhaust temperature underprotection of the compressor (1) and the low-pressure underprotection of the water source air conditioning system, comprising: It is determined whether the water inlet temperature of the plate heat exchanger (7) is greater than a first set water inlet temperature or less than a second set water inlet temperature; If it is determined that the water inlet temperature of the plate heat exchanger (7) is greater than a first set water inlet temperature, or it is determined that the water inlet temperature of the plate heat exchanger (7) is less than or equal to the first set water inlet temperature and greater than a second set water inlet temperature, then the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are adjusted according to the discharge temperature of the compressor (1) to realize the discharge temperature overhigh protection of the compressor (1); If it is determined that the water inlet temperature of the plate heat exchanger (7) is less than or equal to the second set water inlet temperature, or it is determined that the water inlet temperature of the plate heat exchanger (7) is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, then at least one of the low pressure overlow protection of the water source air conditioning system and the discharge temperature overlow protection of the compressor (1) is realized according to at least one of the water outlet temperature of the plate heat exchanger (7), the discharge superheat of the compressor (1) and the low pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9).

3. The control method of a water-source air-conditioning system according to claim 2, characterized by, Adjusting the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) according to the discharge temperature of the compressor (1) to realize the discharge temperature overhigh protection of the compressor (1) comprises: Determining whether the discharge temperature of the compressor (1) is greater than a first set discharge temperature continuously for a first set time: if yes, then the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by a first set number of steps; otherwise, the water source air conditioning system is controlled to operate according to preset normal control parameters; After the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by the first set number of steps, the water source air conditioning system is controlled to operate according to control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by the first set number of steps; and it is determined whether the discharge temperature of the compressor (1) is greater than a second set discharge temperature continuously for the first set time: if yes, then the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by a second set number of steps; otherwise, the water source air conditioning system is continuously controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by the first set number of steps; wherein the second set discharge temperature is greater than the first set discharge temperature, and the second set number of steps is greater than the first set number of steps. After increasing the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) by the second set number of steps, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are increased by the second set number of steps, and it is determined whether the exhaust temperature of the compressor (1) is greater than the third set exhaust temperature continuously for the second set time; if yes, the water source air conditioning system is controlled to stop operating; otherwise, the water source air conditioning system is continuously controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are increased by the second set number of steps; wherein the second set time is less than the first set time, and the third set exhaust temperature is greater than the second set exhaust temperature. After the water source air conditioning system is controlled to stop operating, it is determined whether the exhaust temperature of the compressor (1) is less than the fourth set exhaust temperature continuously for the third set time; if yes, the water source air conditioning system is controlled to resume operating; otherwise, the water source air conditioning system is controlled to maintain the state of stopping operating; wherein the third set time is greater than the first set time, and the fourth set exhaust temperature is less than the first set exhaust temperature.

4. The control method of a water-source air-conditioning system according to claim 2, characterized by, At least one of low-pressure over-low protection of the water source air conditioning system and exhaust temperature over-low protection of the compressor (1) is realized according to at least one of the outlet water temperature of the plate heat exchanger (7), the exhaust superheat of the compressor (1), and the low-pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9), including: It is determined whether the outlet water temperature of the plate heat exchanger (7) is greater than the first set outlet water temperature or less than the second set outlet water temperature; If it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the first set outlet water temperature, or it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, at least one of low-pressure over-low protection of the water source air conditioning system and exhaust temperature over-low protection of the compressor (1) is realized according to at least one of the low-pressure temperature value of the water source air conditioning system and the exhaust superheat of the compressor (1), in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9); If it is determined that the outlet water temperature of the plate heat exchanger (7) is less than or equal to the second set outlet water temperature, low-pressure over-low protection of the water source air conditioning system is realized according to the low-pressure temperature value of the water source air conditioning system.

5. The control method of a water-source air-conditioning system according to claim 4, characterized by, If it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the first set outlet water temperature, or it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, at least one of the low pressure temperature value of the water source air conditioning system and the exhaust gas superheat degree of the compressor (1) is used in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) to realize at least one of low pressure over low protection of the water source air conditioning system and exhaust gas temperature over low protection of the compressor (1), comprising: If it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the first set outlet water temperature, it is determined whether the low pressure temperature value of the water source air conditioning system is less than the first set low pressure temperature for a continuous fourth set time; if yes, the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are both increased by a first set dynamic step increase value; otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system. After the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are both increased by the first set dynamic step increase value, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are both increased by the first set dynamic step increase value; the exhaust gas temperature over low protection of the compressor (1) is realized according to the exhaust gas superheat degree of the compressor (1) in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9); and it is determined whether the low pressure temperature value of the water source air conditioning system is less than the difference between the first set low pressure temperature and the set temperature for a continuous fourth set time; if yes, the compressor (1) is controlled to stop operating; otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system.

6. The control method of a water-source air-conditioning system according to claim 4, characterized by, Wherein, If it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the first set outlet water temperature, or it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, at least one of the low pressure temperature value of the water source air conditioning system and the exhaust gas superheat degree of the compressor (1) is used in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) to realize at least one of low pressure over low protection of the water source air conditioning system and exhaust gas temperature over low protection of the compressor (1), further comprising: If it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, it is determined whether the low pressure temperature value of the water source air conditioning system is less than the second set low pressure temperature for a fourth set time; if yes, the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are both increased by a second set dynamic step increase value; otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system; the second set low pressure temperature is greater than the first set low pressure temperature. After the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are both increased by the second set dynamic step increase value, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are both increased by the second set dynamic step increase value; according to the discharge superheat of the compressor (1), in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9), the discharge temperature over-low protection of the compressor (1) is realized; and it is determined whether the low pressure temperature value of the water source air conditioning system is less than the difference between the second set low pressure temperature and the set temperature for a fourth set time; if yes, the compressor (1) is controlled to stop operating; otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system; and / or If it is determined that the outlet water temperature of the plate heat exchanger (7) is less than or equal to the second set outlet water temperature, the low pressure over-low protection of the water source air conditioning system is realized according to the low pressure temperature value of the water source air conditioning system, including: If it is determined that the outlet water temperature of the plate heat exchanger (7) is less than or equal to the second set outlet water temperature, the compressor (1) is controlled to stop operating in the case that the low pressure temperature value of the water source air conditioning system is less than a third set low pressure temperature for a first set time; wherein the third set low pressure temperature is less than the first set low pressure temperature.

7. The control method of a water-source air-conditioning system according to claim 5 or 6, characterized by, According to the discharge superheat of the compressor (1), in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9), the discharge temperature over-low protection of the compressor (1) is realized, including: After the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are both decreased by a first set dynamic step decrease value in the case that the outlet water temperature of the plate heat exchanger (7) is greater than the first set outlet water temperature, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are both decreased by the first set dynamic step decrease value; Wherein, the first set dynamic step increase value and the first set dynamic step decrease value are dynamically calculated according to the adjustment times of the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9). In the case that the outlet water temperature of the plate heat exchanger (7) is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, after the opening of the heating electronic expansion valve (8) and the opening of the supercooler electronic expansion valve (9) are both reduced by the second set dynamic step number reduction value, the water source air conditioning system is controlled to operate according to the control parameters after the opening of the heating electronic expansion valve (8) and the opening of the supercooler electronic expansion valve (9) are both reduced by the second set dynamic step number reduction value. The second set dynamic step number increase value and the second set dynamic step number reduction value are dynamically calculated according to the number of adjustments of the opening of the heating electronic expansion valve (8) and the opening of the supercooler electronic expansion valve (9).

8. The control method of a water-source air-conditioning system according to claim 7, characterized by, The first set dynamic step number increase value and the first set dynamic step number reduction value are dynamically calculated according to the number of adjustments of the opening of the heating electronic expansion valve (8) and the opening of the supercooler electronic expansion valve (9), including: The first set dynamic step number increase value at the nth adjustment is the initial set step number; the first set dynamic step number reduction value at the nth adjustment is the first set step number; n is a positive integer; The first set dynamic step number increase value at the (n+1)th adjustment is half of the sum of the first set dynamic step number increase value at the nth adjustment and the first set dynamic step number reduction value at the nth adjustment; the first set dynamic step number reduction value at the (n+1)th adjustment is half of the sum of the first set dynamic step number increase value at the (n+1)th adjustment and the first set dynamic step number reduction value at the nth adjustment; During the adjustment process, if the first set dynamic step number increase value at the (m-1)th adjustment is equal to the first set dynamic step number reduction value at the (m-1)th adjustment, then the first set dynamic step number increase value and the first set dynamic step number reduction value are interchanged at the mth and subsequent adjustments; m is a positive integer and m is less than or equal to n; The way of dynamically calculating the second set dynamic step number increase value and the second set dynamic step number reduction value according to the number of adjustments of the opening of the heating electronic expansion valve (8) and the opening of the supercooler electronic expansion valve (9) is the same as the way of dynamically calculating the first set dynamic step number increase value and the first set dynamic step number reduction value according to the number of adjustments of the opening of the heating electronic expansion valve (8) and the opening of the supercooler electronic expansion valve (9).

9. A control device for a water source air conditioning system, comprising: a control unit; a sensor; and a control valve. The water source air conditioning system comprises a compressor (1), a four-way valve (3), an indoor heat exchanger, an outdoor heat exchanger, a supercooling device (10), a heating electronic expansion valve (8), a supercooling electronic expansion valve (9) and a supercooling electromagnetic valve (11); the outdoor heat exchanger is a plate heat exchanger (7); wherein the exhaust port of the compressor (1) is communicated to the fourth valve port of the four-way valve (3), the first valve port of the four-way valve (3) is communicated to the first port of the indoor heat exchanger, the second port of the indoor heat exchanger is divided into two paths after the first refrigerant pipeline of the supercooling device (10), one path is communicated to the third valve port of the four-way valve (3) after the refrigerant heat exchange pipeline of the heating electronic expansion valve (8) and the plate heat exchanger (7), and the other path is communicated to the second valve port of the four-way valve (3) after the bypass pipeline of the supercooling device (10), the supercooling electronic expansion valve (9), the second refrigerant pipeline of the supercooling device (10) and the supercooling electromagnetic valve (11); the control device of the water source air conditioning system comprises: The acquisition unit is configured to acquire the water inlet temperature of the plate heat exchanger (7) when the water source air conditioning system operates in the heating mode; acquire the water outlet temperature of the plate heat exchanger (7); acquire the exhaust temperature of the compressor (1); acquire the exhaust superheat of the compressor (1); and acquire the low-pressure temperature value before the pipeline where the supercooling electromagnetic valve (11) is divided into two paths as the low-pressure temperature value of the water source air conditioning system; The control unit is configured to realize at least one protection of the exhaust temperature overprotection of the compressor (1), the exhaust temperature underprotection of the compressor (1) and the low-pressure underprotection of the water source air conditioning system according to at least one of the water inlet temperature of the plate heat exchanger (7), the water outlet temperature of the plate heat exchanger (7), the exhaust temperature of the compressor (1), the exhaust superheat of the compressor (1) and the low-pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooling electronic expansion valve (9).

10. The control device of a water-source air-conditioning system according to claim 9, wherein The control unit realizes at least one protection of the exhaust temperature overprotection of the compressor (1), the exhaust temperature underprotection of the compressor (1) and the low-pressure underprotection of the water source air conditioning system according to at least one of the water inlet temperature of the plate heat exchanger (7), the water outlet temperature of the plate heat exchanger (7), the exhaust temperature of the compressor (1), the exhaust superheat of the compressor (1) and the low-pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooling electronic expansion valve (9), comprising: Determine whether the water inlet temperature of the plate heat exchanger (7) is greater than a first set water inlet temperature or less than a second set water inlet temperature; If it is determined that the water inlet temperature of the plate heat exchanger (7) is greater than a first set water inlet temperature, or it is determined that the water inlet temperature of the plate heat exchanger (7) is less than or equal to the first set water inlet temperature and greater than a second set water inlet temperature, then the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are adjusted according to the discharge temperature of the compressor (1) to realize the discharge temperature overhigh protection of the compressor (1); If it is determined that the water inlet temperature of the plate heat exchanger (7) is less than or equal to the second set water inlet temperature, or it is determined that the water inlet temperature of the plate heat exchanger (7) is less than or equal to the first set water inlet temperature and greater than the second set water inlet temperature, then at least one of the low pressure overlow protection of the water source air conditioning system and the discharge temperature overlow protection of the compressor (1) is realized according to at least one of the water outlet temperature of the plate heat exchanger (7), the discharge superheat of the compressor (1), and the low pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9).

11. The control device of a water-source air-conditioning system according to claim 10, wherein The control unit adjusts the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) according to the discharge temperature of the compressor (1) to realize the discharge temperature overhigh protection of the compressor (1), which comprises: It is determined whether the discharge temperature of the compressor (1) is greater than a first set discharge temperature continuously for a first set time; if yes, the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by a first set number of steps; otherwise, the water source air conditioning system is controlled to operate according to preset normal control parameters; After the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by the first set number of steps, the water source air conditioning system is controlled to operate according to control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by the first set number of steps; and it is determined whether the discharge temperature of the compressor (1) is greater than a second set discharge temperature continuously for the first set time; if yes, the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by a second set number of steps; otherwise, the water source air conditioning system is continuously controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by the first set number of steps; wherein the second set discharge temperature is greater than the first set discharge temperature, and the second set number of steps is greater than the first set number of steps. After increasing the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) by the second set number of steps, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are increased by the second set number of steps, and it is determined whether the exhaust temperature of the compressor (1) is greater than the third set exhaust temperature continuously for the second set time; if yes, the water source air conditioning system is controlled to stop operating; otherwise, the water source air conditioning system is continuously controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are increased by the second set number of steps; wherein the second set time is less than the first set time, and the third set exhaust temperature is greater than the second set exhaust temperature. After the water source air conditioning system is controlled to stop operating, it is determined whether the exhaust temperature of the compressor (1) is less than the fourth set exhaust temperature continuously for the third set time; if yes, the water source air conditioning system is controlled to resume operating; otherwise, the water source air conditioning system is controlled to maintain the state of stopping operating; wherein the third set time is greater than the first set time, and the fourth set exhaust temperature is less than the first set exhaust temperature.

12. The control apparatus of a water-source air-conditioning system according to claim 10, wherein The control unit realizes at least one protection of low-pressure over-low protection of the water source air conditioning system and exhaust temperature over-low protection of the compressor (1) according to at least one of the outlet water temperature of the plate heat exchanger (7), the exhaust superheat of the compressor (1), and the low-pressure temperature value of the water source air conditioning system, in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9), including: It is determined whether the outlet water temperature of the plate heat exchanger (7) is greater than the first set outlet water temperature or less than the second set outlet water temperature; If it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the first set outlet water temperature, or it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, at least one protection of low-pressure over-low protection of the water source air conditioning system and exhaust temperature over-low protection of the compressor (1) is realized according to at least one of the low-pressure temperature value of the water source air conditioning system and the exhaust superheat of the compressor (1), in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9); If it is determined that the outlet water temperature of the plate heat exchanger (7) is less than or equal to the second set outlet water temperature, low-pressure over-low protection of the water source air conditioning system is realized according to the low-pressure temperature value of the water source air conditioning system.

13. The control device of a water-source air-conditioning system according to claim 12, wherein The control unit, if it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the first set outlet water temperature, or it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, at least one of the low-pressure temperature value of the water source air conditioning system and the exhaust gas superheat degree of the compressor (1) is combined with the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) to realize at least one protection of low-pressure over-low protection of the water source air conditioning system and exhaust gas temperature over-low protection of the compressor (1), comprising: If it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the first set outlet water temperature, it is determined whether the low-pressure temperature value of the water source air conditioning system is less than the first set low-pressure temperature for a continuous fourth set time: if yes, the water source air conditioning system is increased by increasing the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) by a first set dynamic step increase value; otherwise, the water source air conditioning system is controlled to operate according to the current control parameter of the water source air conditioning system; After increasing the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) by the first set dynamic step increase value, the water source air conditioning system is controlled to operate according to the control parameter after the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are increased by the first set dynamic step increase value; according to the exhaust gas superheat degree of the compressor (1), combined with the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9), realize the exhaust gas temperature over-low protection of the compressor (1); and determine whether the low-pressure temperature value of the water source air conditioning system is less than the difference between the first set low-pressure temperature and the set temperature for a continuous fourth set time: if yes, the compressor (1) is controlled to stop running; otherwise, the water source air conditioning system is controlled to operate according to the current control parameter of the water source air conditioning system.

14. The control apparatus of a water-source air-conditioning system according to claim 12, wherein Wherein, The control unit, if it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the first set outlet water temperature, or it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, at least one of the low-pressure temperature value of the water source air conditioning system and the exhaust gas superheat degree of the compressor (1) is combined with the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) to realize at least one protection of low-pressure over-low protection of the water source air conditioning system and exhaust gas temperature over-low protection of the compressor (1), further comprising: If it is determined that the outlet water temperature of the plate heat exchanger (7) is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, it is determined whether the low-pressure temperature value of the water source air conditioning system is less than the second set low-pressure temperature for a fourth set time; if yes, the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by a second set dynamic step increase value; otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system; and the second set low-pressure temperature is greater than the first set low-pressure temperature. After the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by the second set dynamic step increase value, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by the second set dynamic step increase value; the exhaust gas temperature of the compressor (1) is protected according to the exhaust gas superheat degree of the compressor (1) in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9); and it is determined whether the low-pressure temperature value of the water source air conditioning system is less than the difference between the second set low-pressure temperature and the set temperature for a fourth set time; if yes, the compressor (1) is controlled to stop operating; otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system. And / or, If it is determined that the outlet water temperature of the plate heat exchanger (7) is less than or equal to the second set outlet water temperature, the low-pressure protection of the water source air conditioning system is realized according to the low-pressure temperature value of the water source air conditioning system, including: If it is determined that the outlet water temperature of the plate heat exchanger (7) is less than or equal to the second set outlet water temperature, the compressor (1) is controlled to stop operating if it is determined that the low-pressure temperature value of the water source air conditioning system is less than a third set low-pressure temperature for a first set time; and the third set low-pressure temperature is less than the first set low-pressure temperature.

15. The control device of a water-source air-conditioning system according to claim 13 or 14, characterized by, The control unit realizes the exhaust gas temperature protection of the compressor (1) according to the exhaust gas superheat degree of the compressor (1) in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9), including: After the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by the second set dynamic step increase value, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9) are both increased by the second set dynamic step increase value; the exhaust gas temperature of the compressor (1) is protected according to the exhaust gas superheat degree of the compressor (1) in combination with the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9); and it is determined whether the low-pressure temperature value of the water source air conditioning system is less than the difference between the second set low-pressure temperature and the set temperature for a fourth set time; if yes, the compressor (1) is controlled to stop operating; otherwise, the water source air conditioning system is controlled to operate according to the current control parameters of the water source air conditioning system. Wherein, the first set dynamic step increase value and the first set dynamic step decrease value are dynamically calculated according to the adjustment times of the opening degree of the heating electronic expansion valve (8) and the opening degree of the subcooler electronic expansion valve (9). In a case where the outlet water temperature of the plate heat exchanger (7) is greater than the second set outlet water temperature and less than or equal to the first set outlet water temperature, after the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are both reduced by a second set dynamic step number reduction value, the water source air conditioning system is controlled to operate according to the control parameters after the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) are both reduced by the second set dynamic step number reduction value. The second set dynamic step number increase value and the second set dynamic step number reduction value are dynamically calculated according to the number of adjustments of the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9).

16. The control apparatus of a water-source air-conditioning system according to claim 15, wherein The control unit dynamically calculates a first set dynamic step number increase value and a first set dynamic step number reduction value according to the number of adjustments of the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9), and includes: The first set dynamic step number increase value at the nth adjustment is an initial set step number; the first set dynamic step number reduction value at the nth adjustment is a first set step number; n is a positive integer; The first set dynamic step number increase value at the (n+1)th adjustment is half of the sum of the first set dynamic step number increase value at the nth adjustment and the first set dynamic step number reduction value at the nth adjustment; the first set dynamic step number reduction value at the (n+1)th adjustment is half of the sum of the first set dynamic step number increase value at the (n+1)th adjustment and the first set dynamic step number reduction value at the nth adjustment; During the adjustment process, if the first set dynamic step number increase value at the (m-1)th adjustment is equal to the first set dynamic step number reduction value at the (m-1)th adjustment, the first set dynamic step number increase value and the first set dynamic step number reduction value are interchanged at the mth and subsequent adjustments; m is a positive integer and m is less than or equal to n; The control unit dynamically calculates the second set dynamic step number increase value and the second set dynamic step number reduction value according to the number of adjustments of the opening degree of the heating electronic expansion valve (8) and the opening degree of the supercooler electronic expansion valve (9) in the same way as the first set dynamic step number increase value and the first set dynamic step number reduction value.

17. A water source air conditioning system comprising: The control device of the water source air conditioning system according to any one of claims 9 to 16. The storage medium includes a stored program, wherein when the program is executed, the device in which the storage medium is located performs the control method of the water source air conditioning system according to any one of claims 1 to 8.

18. A storage medium, characterized by ​

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