Water source multi-split air conditioner control method and device, water source multi-split air conditioner and storage medium

Abstract

The invention relates to a water source multi-split air conditioner control method and device, a water source multi-split air conditioner and a storage medium. A water flow adjusting valve is arranged on a water inlet pipeline of the outdoor unit heat exchanger, and the method comprises the steps that the working mode of any outdoor unit in the running state is determined; in the refrigeration mode, the opening degree of a water flow regulating valve of the outdoor unit is controlled according to the water inlet temperature of the outdoor unit or the saturation temperature corresponding to the condensing pressure; and in the heating mode, the opening degree of a water flow regulating valve of the outdoor unit is controlled according to the water inlet temperature of the outdoor unit or the saturation temperature corresponding to the evaporation pressure. The opening degree of the water flow adjusting valve is controlled according to the actual operation load requirement of the refrigerant system, the water flow of the water system is actively adjusted according to the requirement, the low-load small water flow and the high-load large water flow are achieved, and therefore the operation cost of the water system is reduced, and the problem that in the prior art, the operation cost of a water source multi-split air conditioner is high is solved; the automatic adjustment of the water flow of the water source multi-split air conditioner is realized.

Description

Technical Field

[0001] The present application relates to the technical field of water source multi-connection systems, and in particular to a water source multi-connection system control method, device, water source multi-connection system and storage medium. Background Art

[0002] The water-source multi-split unit (abbreviated as water multi-split unit) includes multiple indoor units and one or more outdoor units. The outdoor units use water as the coolant to condense or evaporate the refrigerant. The specific heat capacity of water is much higher than that of air. Therefore, compared with the air-source multi-split unit, the water-source multi-split unit is more efficient and energy-saving. According to the circulating medium, the water-source multi-split unit includes a water system and a refrigerant system. The water system and the refrigerant system exchange heat at the outdoor unit heat exchanger.

[0003] At present, the water systems of water source multi-split units are designed at full load, that is, at maximum load, so their water pumps, cooling towers, etc. are all maximum configuration equipment, and in order to reduce the difficulty of the project, the water system will not be equipped with variable water flow equipment, that is, no matter how the load demand changes, the water system will operate at maximum water flow all day long throughout the year. Therefore, every time it works, the water fee is much higher than the cost of air conditioning operation. Influenced by the goal of reducing the cost of project installation, general projects will not actively choose variable water volume design, that is, directly choose AC fixed frequency water pumps, and there is no water flow regulation mechanism or system, and the cost of the variable water volume system itself will also be very high, which will further increase the installation cost.

[0004] The water source multi-split system is designed with full water flow. Regardless of whether one or all indoor units are turned on during actual use, the water system is running at full load, resulting in high water and electricity costs. Although the refrigerant system of the water source multi-split system has high energy efficiency, the operating cost of the water system is very high, resulting in high operating costs for the entire water source multi-split system, which is much higher than the initial investment, later operation and maintenance costs of the air source multi-split system. Summary of the invention

[0005] The present application provides a water source multi-connected system control method, device, water source multi-connected system and storage medium, so as to at least solve the problem of high operating cost of water source multi-connected system in the prior art.

[0006] In a first aspect, the present application provides a water source multi-split control method, wherein a water flow regulating valve is arranged on the water inlet pipe of an external heat exchanger, and the method comprises:

[0007] For any external unit in operation, determine the working mode of the external unit;

[0008] In cooling mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the saturation temperature corresponding to the water inlet temperature or condensing pressure of the outdoor unit;

[0009] In the heating mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the saturation temperature corresponding to the water inlet temperature or the evaporation pressure of the outdoor unit.

[0010] Optionally, in the cooling mode, controlling the opening of the water flow regulating valve of the external unit according to the water inlet temperature of the external unit includes:

[0011] Detect the water inlet temperature of the outdoor unit;

[0012] When the water inlet temperature of the external unit is greater than or equal to a first temperature threshold, increasing the opening of the water flow regulating valve of the external unit;

[0013] When the water inlet temperature of the external unit is less than or equal to the second temperature threshold, reducing the opening of the water flow regulating valve of the external unit;

[0014] When the water inlet temperature of the external unit is greater than the second temperature threshold and less than the first temperature threshold, the current opening of the water flow regulating valve of the external unit is kept unchanged.

[0015] Optionally, in the cooling mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the saturation temperature corresponding to the condensing pressure of the outdoor unit, including:

[0016] Obtain the saturation temperature corresponding to the condensing pressure of the outdoor unit;

[0017] When the saturation temperature corresponding to the condensing pressure of the external unit is greater than or equal to the third temperature threshold, increasing the opening of the water flow regulating valve of the external unit;

[0018] When the saturation temperature corresponding to the condensing pressure of the external unit is less than or equal to the fourth temperature threshold, reducing the opening of the water flow regulating valve of the external unit;

[0019] When the saturation temperature corresponding to the condensing pressure of the external unit is greater than the fourth temperature threshold and less than the third temperature threshold, the current opening of the water flow regulating valve of the external unit is kept unchanged;

[0020] When the saturation temperature corresponding to the condensing pressure of the outdoor unit is greater than or equal to the fifth temperature threshold for a first preset time in a row, the opening of the water flow regulating valve of the outdoor unit is adjusted to the maximum, wherein the fifth temperature threshold is greater than the third temperature threshold.

[0021] Optionally, in the heating mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the water inlet temperature of the outdoor unit, including:

[0022] Detect the water inlet temperature of the outdoor unit;

[0023] When the water inlet temperature of the external unit is less than or equal to a sixth temperature threshold, increasing the opening of the water flow regulating valve of the external unit;

[0024] When the water inlet temperature of the external unit is greater than or equal to the seventh temperature threshold, reducing the opening of the water flow regulating valve of the external unit;

[0025] When the water inlet temperature of the external unit is greater than the sixth temperature threshold and less than the seventh temperature threshold, the current opening of the water flow regulating valve of the external unit is kept unchanged.

[0026] Optionally, in the heating mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the saturation temperature corresponding to the evaporation pressure of the outdoor unit, including:

[0027] Obtain the saturation temperature corresponding to the evaporation pressure of the outdoor unit;

[0028] When the saturation temperature corresponding to the evaporation pressure of the outdoor unit is less than or equal to the eighth temperature threshold, increasing the opening of the water flow regulating valve of the outdoor unit;

[0029] When the saturation temperature corresponding to the evaporation pressure of the outdoor unit is greater than or equal to a ninth temperature threshold, reducing the opening of the water flow regulating valve of the outdoor unit;

[0030] When the saturation temperature corresponding to the evaporation pressure of the outdoor unit is greater than the eighth temperature threshold and less than the ninth temperature threshold, the current opening of the water flow regulating valve of the outdoor unit is kept unchanged;

[0031] When any of the following conditions is met, the opening of the water flow regulating valve of the external unit is adjusted to the maximum: (1) the saturation temperature corresponding to the evaporation pressure of the external unit is less than or equal to the tenth temperature threshold for the second consecutive preset time; (2) the difference between the gas outlet pipe temperature of the external unit and the saturation temperature corresponding to the evaporation pressure is less than or equal to the eleventh temperature threshold for the third consecutive preset time, and the saturation temperature corresponding to the condensation pressure of the external unit is less than or equal to the third temperature threshold; wherein the tenth temperature threshold is less than the eighth temperature threshold.

[0032] Optionally, the method further comprises:

[0033] In response to a shutdown instruction of the outdoor unit, calculating an average value of an inlet water temperature and an outlet water temperature of the outdoor unit;

[0034] When the average value is less than or equal to the twelfth temperature threshold, adjusting the opening of the water flow regulating valve of the external unit to the maximum;

[0035] When the average value is greater than or equal to the thirteenth temperature threshold, closing the water flow regulating valve of the external unit;

[0036] When the average value is greater than the twelfth temperature threshold and less than the thirteenth temperature threshold, the current opening of the water flow regulating valve of the external unit is kept unchanged.

[0037] Optionally, the method further includes: in response to a start-up instruction of the external unit, adjusting the opening of a water flow regulating valve of the external unit to the maximum, and then starting a compressor of the external unit.

[0038] In a second aspect, the present application provides a water source multi-split control device, wherein a water flow regulating valve is arranged on the water inlet pipe of the external heat exchanger, and the device comprises:

[0039] A determination module, used for determining the working mode of any external unit in a running state;

[0040] A first control module is used to control the opening of the water flow regulating valve of the outdoor unit according to the saturation temperature corresponding to the water inlet temperature or condensation pressure of the outdoor unit in the cooling mode;

[0041] The second control module is used to control the opening of the water flow regulating valve of the outdoor unit according to the saturation temperature corresponding to the water inlet temperature or evaporation pressure of the outdoor unit in the heating mode.

[0042] In a third aspect, the present application provides a water source multi-connection system, including: a water source multi-connection system control device as described in an embodiment of the present application.

[0043] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the water source multi-connection control method described in the embodiment of the present application is implemented.

[0044] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0045] The water source multi-split control method provided in the embodiment of the present application is to set a water flow regulating valve on the water inlet pipe of the external unit heat exchanger, control the opening of the water flow regulating valve according to the actual operating load demand of the refrigerant system, and actively adjust the water flow of the water system as needed to achieve low load and small water flow, and high load and large water flow, thereby reducing the operating cost of the water system, solving the problem of high operating cost of the water source multi-split in the prior art, and realizing autonomous regulation of the water flow of the water source multi-split. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0048] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0049] Figure 1 It is a flow chart of a water source multi-connection control method provided in an embodiment of the present application;

[0050] Figure 2 It is a schematic diagram of the structure of the water source multi-connection system provided in the embodiment of the present application;

[0051] Figure 3 It is a schematic diagram of the water source multi-connection control process provided by the embodiment of the present application;

[0052] Figure 4 It is a structural block diagram of a water source multi-connection control device provided in an embodiment of the present application;

[0053] Figure 5 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0055] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0056] At present, the water source multi-split system is directly designed for full water flow, that is, it is designed according to the water flow required for full load. Regardless of whether one indoor unit or all indoor units are turned on during actual use, the water system is running at full load, resulting in high water and electricity costs. Although the refrigerant system of the water source multi-split system has high energy efficiency, the operating cost of the water system is very high, resulting in high operating costs for the entire water source multi-split system.

[0057] In order to solve the technical problem of high operating cost of water source multi-split in the prior art, the present application sets a water flow regulating valve on the water inlet pipeline of each external heat exchanger in the water source multi-split, and provides a water source multi-split control method. Figure 1 is a flow chart of a water source multi-connection control method provided in an embodiment of the present application, such as Figure 1 As shown, the method comprises the following steps:

[0058] S101, for any external unit in operation, determining the operation mode of the external unit.

[0059] S102, in the cooling mode, controlling the opening of the water flow regulating valve of the outdoor unit according to the saturation temperature corresponding to the water inlet temperature or the condensation pressure of the outdoor unit.

[0060] S103, in the heating mode, controlling the opening of the water flow regulating valve of the outdoor unit according to the saturation temperature corresponding to the water inlet temperature or the evaporation pressure of the outdoor unit.

[0061] The working modes include cooling mode and heating mode. In cooling mode, the outdoor heat exchanger acts as a condenser, and in heating mode, the outdoor heat exchanger acts as an evaporator. In other modes such as dehumidification and defrosting, the water flow regulating valve is controlled based on the refrigerant flow direction in this mode. If the refrigerant flow direction in this mode is the same as that in the cooling mode, the water flow regulating valve is controlled according to the cooling mode. If the refrigerant flow direction in this mode is the same as that in the heating mode, the water flow regulating valve is controlled according to the heating mode.

[0062] The inlet water temperature of the outdoor unit can be detected by the temperature sensor on the inlet pipe. The condensing pressure (also called high pressure) can be detected by the high pressure sensor, and then the saturation temperature corresponding to the condensing pressure can be converted. The evaporating pressure (also called low pressure) can be detected by the low pressure sensor, and then the saturation temperature corresponding to the evaporating pressure can be converted. According to the specific selection of the water flow control valve, its opening can be changed by steps, percentages or time, for example, opening 50pls, opening 20%, or opening 10 seconds.

[0063] In this embodiment, a water flow regulating valve is arranged on the water inlet pipe of the external unit heat exchanger, and the opening of the water flow regulating valve is controlled according to the actual operating load demand of the refrigerant system, so as to actively adjust the water flow of the water system as needed to achieve low load and small water flow, and high load and large water flow, thereby reducing the operating cost of the water system, solving the problem of high operating cost of the water source multi-split unit in the prior art, and realizing the autonomous regulation of the water flow of the water source multi-split unit.

[0064] In cooling mode, the control priority of the saturation temperature corresponding to the condensing pressure is higher than the control priority of the inlet water temperature. For the water flow control strategy of the water source multi-split unit in cooling mode, it can only support control based on the inlet water temperature, or only support control based on the saturation temperature corresponding to the condensing pressure, or it can also support the above two control bases at the same time, that is, control based on the inlet water temperature and control based on the saturation temperature corresponding to the condensing pressure. Both are effective at the same time, but considering that the refrigerant directly acts on the compressor, and water only acts as a coolant and plays an indirect role, the change of condensing pressure has a more direct and greater impact on the unit than the change of inlet water temperature. That is, in cooling mode, the saturation temperature corresponding to the condensing pressure can directly reflect the actual load demand of the refrigerant system, and the inlet water temperature of the outdoor unit can indirectly reflect the actual load demand of the refrigerant system. Therefore, in order to realize the unit adjustment more directly and effectively, when the two are effective at the same time, the two are not superimposed for control, but the control is performed based on the saturation temperature corresponding to the condensing pressure with a higher control priority.

[0065] In heating mode, the control priority of the saturation temperature corresponding to the evaporation pressure is higher than the control priority of the inlet water temperature. For the water flow control strategy of the water source multi-split unit in heating mode, it can only support control based on the inlet water temperature, or only support control based on the saturation temperature corresponding to the evaporation pressure, or it can also support the above two control bases at the same time, that is, control based on the inlet water temperature and control based on the saturation temperature corresponding to the evaporation pressure. Both are effective at the same time, but considering that the refrigerant directly acts on the compressor, and water only acts as a coolant and plays an indirect role, the change of evaporation pressure has a more direct and greater impact on the unit than the change of inlet water temperature, that is, in heating mode, the saturation temperature corresponding to the evaporation pressure can directly reflect the actual load demand of the refrigerant system, and the inlet water temperature of the outdoor unit can indirectly reflect the actual load demand of the refrigerant system. Therefore, in order to realize the unit adjustment more directly and effectively, when the two are effective at the same time, the two are not superimposed on each other, but the control is performed based on the saturation temperature corresponding to the evaporation pressure with a higher control priority.

[0066] The following describes the water flow control of the water source multi-split unit in cooling mode and heating mode respectively.

[0067] (1) Cooling mode

[0068] In the cooling mode, the opening of the water flow regulating valve of the external unit is controlled according to the water inlet temperature of the external unit, including: detecting the water inlet temperature of the external unit; when the water inlet temperature of the external unit is greater than or equal to a first temperature threshold, increasing the opening of the water flow regulating valve of the external unit; when the water inlet temperature of the external unit is less than or equal to a second temperature threshold, reducing the opening of the water flow regulating valve of the external unit; when the water inlet temperature of the external unit is greater than the second temperature threshold and less than the first temperature threshold, maintaining the current opening of the water flow regulating valve of the external unit unchanged.

[0069] The first temperature threshold and the second temperature threshold can be preset according to actual conditions. The first temperature threshold is greater than the second temperature threshold. For example, the first temperature threshold is set to 35°C and the second temperature threshold is set to 15°C.

[0070] Through the above control, this embodiment realizes the autonomous adjustment of water flow rate according to the outdoor unit water inlet temperature in the cooling mode. During cooling, the outdoor unit heat exchanger acts as a condenser. To ensure heat exchange, the condensation temperature must be higher than the water temperature. The condensation pressure is positively correlated with the condensation temperature. When the outdoor unit water inlet temperature is high, it means that the load demand is large and the condensation pressure will also be high. At this time, increasing the water flow rate can enhance the heat exchange to meet the load demand, and can also avoid the condensation pressure from continuing to increase and causing high-pressure protection shutdown, and at the same time can reduce the energy consumption of the refrigerant system; when the outdoor unit water inlet temperature is low, it means that the load demand is small and the condensation pressure will also be low. At this time, reducing the water flow rate and reducing the heat exchange can reduce the water system operating costs while meeting the load demand, and can also prevent the condensation pressure from being too low, and prevent the compressor from being worn due to poor oil supply caused by liquid compression or low exhaust temperature.

[0071] In the cooling mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the saturation temperature corresponding to the condensing pressure of the outdoor unit, including: obtaining the saturation temperature corresponding to the condensing pressure of the outdoor unit; when the saturation temperature corresponding to the condensing pressure of the outdoor unit is greater than or equal to the third temperature threshold, increasing the opening of the water flow regulating valve of the outdoor unit; when the saturation temperature corresponding to the condensing pressure of the outdoor unit is less than or equal to the fourth temperature threshold, reducing the opening of the water flow regulating valve of the outdoor unit; when the saturation temperature corresponding to the condensing pressure of the outdoor unit is greater than the fourth temperature threshold and less than the third temperature threshold, keeping the current opening of the water flow regulating valve of the outdoor unit unchanged.

[0072] The third temperature threshold and the fourth temperature threshold can be preset according to actual conditions, and the third temperature threshold is greater than the fourth temperature threshold. For example, the third temperature threshold is set to 42° C. and the fourth temperature threshold is set to 10° C.

[0073] Through the above control, this embodiment realizes the autonomous regulation of water flow rate according to the saturation temperature corresponding to the condensing pressure in the cooling mode. During cooling, the external heat exchanger acts as a condenser. When the saturation temperature corresponding to the condensing pressure is high, the water flow rate is increased, which can enhance the heat exchange to meet the load demand, and can also avoid the high-pressure protection shutdown caused by the condensing pressure being too high, and can also reduce the energy consumption of the refrigerant system; when the saturation temperature corresponding to the condensing pressure is low, the water flow rate is reduced, the heat exchange is reduced, and the water system operation cost can be reduced while meeting the load demand, and the condensing pressure can be prevented from being too low, and the compressor can be prevented from being worn due to poor oil supply caused by the liquid compression or exhaust temperature being too low.

[0074] When the saturation temperature corresponding to the condensing pressure of the outdoor unit is greater than or equal to the fifth temperature threshold for a continuous first preset time, the opening of the water flow regulating valve of the outdoor unit is adjusted to the maximum, wherein the fifth temperature threshold is greater than the third temperature threshold. The first preset time and the fifth temperature threshold can be preset according to actual conditions, for example, the first preset time is set to 10 seconds, and the fifth temperature threshold is set to 58°C. In this embodiment, when the condensing pressure is too high, the water flow regulating valve of the outdoor unit is directly adjusted to the maximum opening, which can effectively avoid high pressure protection shutdown caused by excessive condensing pressure.

[0075] (2) Heating mode

[0076] In the heating mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the water inlet temperature of the outdoor unit, including: detecting the water inlet temperature of the outdoor unit; when the water inlet temperature of the outdoor unit is less than or equal to the sixth temperature threshold, increasing the opening of the water flow regulating valve of the outdoor unit; when the water inlet temperature of the outdoor unit is greater than or equal to the seventh temperature threshold, reducing the opening of the water flow regulating valve of the outdoor unit; when the water inlet temperature of the outdoor unit is greater than the sixth temperature threshold and less than the seventh temperature threshold, maintaining the current opening of the water flow regulating valve of the outdoor unit unchanged.

[0077] The sixth temperature threshold and the seventh temperature threshold can be preset according to actual conditions, and the seventh temperature threshold is greater than the sixth temperature threshold. For example, the sixth temperature threshold is set to 20°C and the seventh temperature threshold is set to 40°C.

[0078] Through the above control, this embodiment realizes the autonomous adjustment of water flow rate according to the inlet water temperature of the outdoor unit in the heating mode. During heating, the outdoor unit heat exchanger acts as an evaporator (i.e., a cold source). When the inlet water temperature of the outdoor unit is low, it indicates that the load demand is large. At this time, increasing the water flow rate can enhance the heat exchange to meet the load demand, and can also prevent the evaporator from freezing and bursting, causing water inflow into the refrigerant system and causing economic losses; when the inlet water temperature of the outdoor unit is high, it indicates that the load demand is small. At this time, reducing the water flow rate can reduce the operating costs of the water system while meeting the load demand.

[0079] In the heating mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the saturation temperature corresponding to the evaporation pressure of the outdoor unit, including: obtaining the saturation temperature corresponding to the evaporation pressure of the outdoor unit; when the saturation temperature corresponding to the evaporation pressure of the outdoor unit is less than or equal to the eighth temperature threshold, increasing the opening of the water flow regulating valve of the outdoor unit; when the saturation temperature corresponding to the evaporation pressure of the outdoor unit is greater than or equal to the ninth temperature threshold, reducing the opening of the water flow regulating valve of the outdoor unit; when the saturation temperature corresponding to the evaporation pressure of the outdoor unit is greater than the eighth temperature threshold and less than the ninth temperature threshold, keeping the current opening of the water flow regulating valve of the outdoor unit unchanged.

[0080] Among them, the eighth temperature threshold and the ninth temperature threshold can be preset according to actual conditions, and the ninth temperature threshold is greater than the eighth temperature threshold. For example, the eighth temperature threshold is set to 3°C and the ninth temperature threshold is set to 10°C.

[0081] Through the above control, this embodiment realizes the autonomous adjustment of water flow rate according to the saturation temperature corresponding to the evaporation pressure in the heating mode. When heating, the outdoor heat exchanger acts as an evaporator (i.e., a cold source). When the saturation temperature corresponding to the evaporation pressure is low, the water flow rate is increased to enhance heat exchange to meet the load demand and prevent the evaporator from freezing and bursting due to the evaporation temperature being too low; when the saturation temperature corresponding to the evaporation pressure is high, the water flow rate is reduced to reduce heat exchange, thereby meeting the load demand and reducing the operating cost of the water system.

[0082] When any of the following conditions is met, adjust the opening of the water flow regulating valve of the outdoor unit to the maximum:

[0083] 1) The saturation temperature corresponding to the evaporation pressure of the outdoor unit is less than or equal to the tenth temperature threshold for a second consecutive preset time;

[0084] 2) For the third consecutive preset time, the difference between the gas outlet pipe temperature of the outdoor unit and the saturation temperature corresponding to the evaporation pressure is less than or equal to the eleventh temperature threshold and the saturation temperature corresponding to the condensation pressure of the outdoor unit is less than or equal to the third temperature threshold; wherein the tenth temperature threshold is less than the eighth temperature threshold.

[0085] Among them, the second preset time, the third preset time, the tenth temperature threshold and the eleventh temperature threshold can be pre-set according to actual conditions. For example, the second preset time is set to 5 seconds, the third preset time is set to 600 seconds, the tenth temperature threshold is set to 0°C, and the eleventh temperature threshold is set to 0°C.

[0086] In the heating mode, the outdoor heat exchanger acts as an evaporator (i.e., a cold source). If the water temperature is low or the water flow is insufficient, there is a risk of ice forming inside the outdoor heat exchanger and bursting, causing water to enter the refrigerant system. Once water enters, the refrigerant system needs to be completely replaced, causing serious economic losses. For this reason, in the case of too low evaporation pressure, this embodiment directly adjusts the outdoor water flow regulating valve to the maximum opening to enhance heat exchange, which can effectively avoid freezing and bursting of the outdoor heat exchanger due to too low evaporation temperature. The difference between the gas outlet pipe temperature of the outdoor unit and the saturation temperature corresponding to the evaporation pressure is too small, indicating that poor heat exchange is likely to cause the gas-liquid separator to be filled with liquid refrigerant. At this time, if the saturation temperature corresponding to the condensation pressure of the outdoor unit is too small, it is easy to cause liquid refrigerant to enter the compressor and cause liquid compression, thereby damaging the compressor. Therefore, in this embodiment, when the above conditions are detected, the outdoor water flow regulating valve is directly adjusted to the maximum opening to enhance heat exchange to protect the compressor.

[0087] During the control process of the above-mentioned cooling mode and heating mode, relevant parameters can be periodically detected and corresponding control can be performed to achieve periodic cycle control and ensure the continuity and stability of the water source multi-connection operation.

[0088] The water flow regulating valve can be adjusted in a preset range, for example, 40pls for opening and 40pls for closing. It should be noted that in heating mode, if the opening of the water flow regulating valve needs to be reduced, the adjustment range can be a smaller value than in other cases, and adjusted slowly multiple times to avoid excessive fluctuations in the indoor unit air outlet temperature due to too fast adjustment, which may affect user comfort.

[0089] The water flow regulating valve can be set with a corresponding adjustable range, that is, the lower limit and upper limit of the opening allowed by the water flow regulating valve are specified. If the opening after adjustment is lower than the lower limit, it will operate according to the lower limit. The upper limit can generally be the maximum opening. In practical applications, the lower limit of the opening of the water flow regulating valve in the heating mode can be higher than the lower limit of the opening in the cooling mode, that is, the adjustable range in the heating mode is smaller to ensure sufficient water flow during heating and avoid freezing and cracking of the outdoor unit heat exchanger due to low water temperature.

[0090] When the water source multi-split unit is shut down, it is also necessary to appropriately control the water flow regulating valve according to the actual situation of the unit. Specifically, the above-mentioned water source multi-split unit control method may also include: in response to the shutdown command of the external unit, calculating the average value of the inlet water temperature and the outlet water temperature of the external unit; when the average value is less than or equal to the twelfth temperature threshold, adjusting the opening of the water flow regulating valve of the external unit to the maximum; when the average value is greater than or equal to the thirteenth temperature threshold, closing the water flow regulating valve of the external unit; when the average value is greater than the twelfth temperature threshold and less than the thirteenth temperature threshold, keeping the current opening of the water flow regulating valve of the external unit unchanged.

[0091] The twelfth temperature threshold and the thirteenth temperature threshold can be preset according to actual conditions, and the thirteenth temperature threshold is greater than the twelfth temperature threshold. For example, the twelfth temperature threshold is set to 3°C, and the thirteenth temperature threshold is set to 5°C. When the machine is just shut down, the refrigerant system still has residual temperature. Using the average value of the outdoor unit water inlet temperature and the outdoor unit water outlet temperature can more accurately reflect the outdoor unit water temperature and improve the accuracy of judgment and control.

[0092] In this embodiment, when shutdown is required, for example: user actively shuts down, shutdown occurs when a temperature point is reached, or shutdown occurs due to a fault (including protection shutdown for water system protection such as abnormal water flow switch, abnormal water inlet temperature, etc.), the opening of the water flow regulating valve is adjusted according to the water temperature of the outdoor unit. When the water temperature of the outdoor unit is low, the opening of the water flow regulating valve of the outdoor unit can be adjusted to the maximum, and a large amount of flowing water can be used to prevent the outdoor unit heat exchanger from freezing and cracking, thereby playing a protective role.

[0093] In an optional embodiment, the water source multi-split control method may further include: in response to a startup instruction of the external unit, adjusting the opening of the water flow regulating valve of the external unit to the maximum, and then starting the compressor of the external unit. This embodiment can realize the initialization of the water flow regulating valve when the water source multi-split unit is started.

[0094] In actual applications, most water flow regulating valves only receive control instructions but no feedback signals. Therefore, a certain duration can be set during which instructions are continuously sent to the water flow regulating valve. When this duration is reached, it is considered that the water flow regulating valve has been opened to the maximum and initialization is completed. At this time, the compressor can be started.

[0095] The above-mentioned water source multi-split unit and its control method are described below in conjunction with a specific embodiment. However, it is worth noting that this specific embodiment is only for better illustrating the present application and does not constitute an improper limitation on the present application. The explanation of terms that are the same or corresponding to the above-mentioned embodiment will not be repeated in this embodiment.

[0096] refer to Figure 2 , is a structural diagram of a water source multi-split unit. Taking an external unit as an example, the external unit mainly includes: a compressor 1, an oil separator 2, a main four-way valve 3, an external unit heat exchanger 4 (which can be a plate heat exchanger or a shell and tube heat exchanger), a liquid reservoir 5, a subcooler 6 and a gas-liquid separator 7. Other devices in the external unit such as a one-way valve, an electronic expansion valve, a sensor, etc. are not the focus of this application and are not described in detail. The internal units 1 to N can cool or heat the target area. The mode converter 8 is used for mode switching, such as conversion between full refrigeration and main refrigeration. Full refrigeration means that all the internal units are fully refrigerated, and main refrigeration means that most of the internal units are refrigerated and the remaining internal units are heated (for heat recovery units, the functions of simultaneous cooling and heating can be realized). The refrigerant circulates between the external unit and the internal unit to form a refrigerant system. The external unit heat exchanger 4 is connected to the water system, and a water flow regulating valve 10 is arranged on its water inlet pipeline. A temperature sensor 9 is also arranged on the water inlet pipeline to detect the inlet water temperature of the external unit. Water system can also be equipped with water flow switch, cooling tower, water pump, water tank, etc. If variable frequency water pump is used, although the equipment investment cost will increase, the water flow regulating valve can realize variable water volume control, reduce the operation cost, and in the case of long-term operation, the overall cost is lower than the existing water source multi-split that has been running at the maximum water volume. In the actual operation process, the water flow regulating valve can be controlled first, and then the variable frequency water pump can be controlled according to the situation. Figure 2 The arrows indicate the refrigerant flow direction in cooling mode.

[0097] refer to Figure 3 , is a schematic diagram of the water source multi-connection control process, including the following steps S1 to S4 (this embodiment takes a water flow regulating valve that changes its opening degree by time as an example):

[0098] S1, initialize the water flow regulating valve when the machine is turned on.

[0099] When a startup request is received (i.e. the indoor unit is set to cooling, dehumidification or heating mode), a valve opening action control instruction is issued to the water flow regulating valve of the outdoor unit that needs to be turned on, as follows:

[0100] When the operating capacity requirement is ≥0, a valve opening action instruction is sent to the water flow regulating valve and the timing starts, and the timing time is T.

[0101] When T<T0 (for example, T0=150 seconds), the water flow regulating valve is continuously issued with a command to open to the maximum;

[0102] When T=T0, the default time for the forced opening mark is T1 seconds. T1 is the minimum time required to ensure that the water flow regulating valve opens from the closed state to the maximum, for example, T1=80;

[0103] When T>T0, the compressor is started, and then the opening of the water flow regulating valve can be controlled according to S2 in the cooling mode or according to S3 in the heating mode.

[0104] Considering that the water flow regulating valve receives instructions and executes actions unidirectionally without feedback signal, and the action of components takes a certain amount of time to take effect, time T0 is set. T0 is the duration to ensure that the water flow regulating valve can be opened to the maximum. Within time T0, the maximum opening instruction is continuously sent to the water flow regulating valve to ensure that the water flow regulating valve can be opened to the maximum.

[0105] When the timing time reaches T0, it means that the water flow regulating valve has been opened to the maximum, and the initialization of the water flow regulating valve is completed. At this time, T1 is assigned a value of 80. The water flow regulating valve has a fixed adjustment rate. If the water flow regulating valve is continuously opened for T1 time, the water flow regulating valve can reach the maximum opening from the closed state. T1 is used as a reference for subsequent opening adjustment. For example, opening it for 0.3×T1 seconds corresponds to a certain opening adjustment range.

[0106] When the actual project does not install or installs a water flow regulating valve with a different adjustment rate, the system defaults to processing it as if a water flow regulating valve exists, that is, it defaults to processing it according to the above T0 and T1 times. The values ​​of T0 and T1 can be changed according to project needs, T0∈[5,300], T1∈[30,200].

[0107] S2, controls the water flow regulating valve in cooling mode.

[0108] (1) For the outdoor unit in operation, adjust and control according to the water inlet temperature t of the outdoor unit:

[0109] When t≥t1℃, the water flow regulating valve corresponding to the outdoor unit opens for T1×0.2 seconds and operates once every T2 seconds;

[0110] When t≤t2℃, the water flow regulating valve corresponding to the outdoor unit opens T1×0.2 seconds and operates once every T2 seconds;

[0111] When t2<t<t1, the water flow regulating valve corresponding to the external unit maintains the current opening unchanged.

[0112] For example, t1 = 35°C, t2 = 15°C, T2 = 180 seconds.

[0113] (2) For the outdoor unit in operation, adjust and control the saturation temperature Pg corresponding to the condensing pressure of the outdoor unit:

[0114] When Pg≥P1℃, the water flow regulating valve corresponding to the outdoor unit opens for T1×0.2 seconds and operates once every T2 seconds;

[0115] When Pg≤P2℃, the water flow regulating valve corresponding to the outdoor unit opens T1×0.2 seconds and operates once every T2 seconds;

[0116] When P2<Pg<P1, the water flow regulating valve corresponding to the external unit maintains the current opening unchanged;

[0117] When Pg≥P3℃ is detected for 10 consecutive seconds, the water flow regulating valve corresponding to the outdoor unit is immediately adjusted to the maximum opening without cycle restriction.

[0118] For example, P1 = 42°C, P2 = 10°C, P3 = 58°C. It should be noted that when the regulation control according to Pg and the regulation control according to t are effective at the same time, the regulation control according to Pg is executed, and the two are not superimposed. The regulation control according to Pg is more direct and fast, which can better meet user needs, save operating costs, and quickly protect the unit.

[0119] The adjustable range of the water flow regulating valve in cooling mode is [0.3×T1, T1], where 0.3×T1 represents the opening of the water flow regulating valve after it is opened from the closed state for 0.3×T1 seconds. During the control process, if the adjusted opening is less than the opening corresponding to 0.3×T1, the water flow regulating valve is directly controlled to operate according to the opening corresponding to 0.3×T1.

[0120] S3, controlling the water flow regulating valve in heating mode.

[0121] (1) For the outdoor unit in operation, adjust and control according to the water inlet temperature t of the outdoor unit:

[0122] When t≤t3℃, the water flow regulating valve corresponding to the outdoor unit opens for T1×0.2 seconds and operates once every T2 seconds;

[0123] When t≥t4℃, the water flow regulating valve corresponding to the outdoor unit opens T1×0.1 seconds and operates once every T2 seconds;

[0124] When t3<t<t4, the water flow regulating valve corresponding to the external unit maintains the current opening unchanged.

[0125] For example, t3=20°C, t4=40°C.

[0126] (2) For the outdoor unit in operation, the saturation temperature Pd corresponding to the evaporation pressure of the outdoor unit is adjusted and controlled:

[0127] When Pd≤P4℃, the water flow regulating valve corresponding to the outdoor unit opens for T1×0.2 seconds and operates once every T2 seconds;

[0128] When Pd≥P5℃, the water flow regulating valve corresponding to the outdoor unit opens T1×0.1 seconds and operates once every T2 seconds;

[0129] When P4<Pd<P5, the water flow regulating valve corresponding to the external unit maintains the current opening unchanged.

[0130] When any of the following conditions is met, the water flow control valve corresponding to the outdoor unit is immediately adjusted to the maximum opening without cycle restriction:

[0131] 1) The Pd of the outdoor unit is detected to be ≤ P6℃ for 5 consecutive seconds;

[0132] 2) The (gas outlet pipe temperature - Pd) of the external unit is detected to be ≤ P7°C and Pg ≤ 42°C for 600 seconds continuously.

[0133] For example, P4 = 3°C, P5 = 10°C, P6 = 0°C, P7 = 0°C. It should be noted that when the regulation control according to Pd and the regulation control according to t are effective at the same time, the regulation control according to Pd is executed, and the two are not superimposed. The regulation control according to Pd is more direct and fast, which can better meet user needs, save operating costs, and quickly protect the unit.

[0134] The adjustable range of the water flow regulating valve in heating mode is [0.5×T1, T1], where 0.5×T1 represents the opening corresponding to the water flow regulating valve opening from the closed state for 0.5×T1 seconds. During the control process, if the adjusted opening is less than the opening corresponding to 0.5×T1, the water flow regulating valve is directly controlled to operate at the opening corresponding to 0.5×T1. Considering that the outdoor ambient temperature is generally low in the heating scenario, the water temperature entering the water source multi-split unit is also low. Low water temperature will cause the outdoor unit heat exchanger to freeze and swell, resulting in damage to the water system and refrigerant system. Therefore, the adjustable range in heating mode is narrower to ensure sufficient water flow in heating mode.

[0135] S4, controls the water flow regulating valve when shutting down.

[0136] When receiving a shutdown command, a temperature point shutdown command, or a fault shutdown command, the control is as follows:

[0137] Calculate the average value t0 = (outdoor unit water inlet temperature + outdoor unit water outlet temperature) / 2;

[0138] When t0≤t5, the water flow regulating valve opens to the maximum degree;

[0139] When t0≥t6, the water flow regulating valve is closed;

[0140] When t5<t0<t6, the water flow regulating valve maintains the current opening unchanged.

[0141] For example, t5=3°C, t6=5°C.

[0142] This specific embodiment provides a water source multi-split unit and a control scheme thereof that can realize autonomous regulation of water flow. According to the actual operation requirements of the water source multi-split unit refrigerant system, the water flow of the water system is actively adjusted, with a small water flow under low load and a large water flow under high load. The water flow is controlled on demand to realize autonomous regulation of the water flow, thereby reducing the expense and operating cost of the water system and reducing the operating cost of the entire water source multi-split unit.

[0143] The present application also provides a water source multi-connection control device, which can be used to implement the water source multi-connection control method described in the above embodiment. A water flow regulating valve is arranged on the water inlet pipe of the external heat exchanger. The water source multi-connection control device can be implemented by software and / or hardware.

[0144] Figure 4 is a structural block diagram of a water source multi-connection control device provided in an embodiment of the present application, such as Figure 4 As shown, the water source multi-connection control device includes:

[0145] A determination module 41 is used to determine the working mode of any external unit in a running state;

[0146] The first control module 42 is used to control the opening of the water flow regulating valve of the outdoor unit according to the saturation temperature corresponding to the water inlet temperature or condensation pressure of the outdoor unit in the cooling mode;

[0147] The second control module 43 is used to control the opening of the water flow regulating valve of the outdoor unit according to the saturation temperature corresponding to the water inlet temperature or evaporation pressure of the outdoor unit in the heating mode.

[0148] Optionally, the first control module 42 includes:

[0149] A first detection unit, used to detect the water inlet temperature of the outdoor unit;

[0150] The first control unit is used to increase the opening of the water flow regulating valve of the external unit when the water inlet temperature of the external unit is greater than or equal to the first temperature threshold; reduce the opening of the water flow regulating valve of the external unit when the water inlet temperature of the external unit is less than or equal to the second temperature threshold; and maintain the current opening of the water flow regulating valve of the external unit unchanged when the water inlet temperature of the external unit is greater than the second temperature threshold and less than the first temperature threshold.

[0151] Optionally, the first control module 42 includes:

[0152] A first acquisition unit is used to acquire a saturation temperature corresponding to the condensing pressure of the external unit;

[0153] The second control unit is used to increase the opening of the water flow regulating valve of the external unit when the saturation temperature corresponding to the condensing pressure of the external unit is greater than or equal to the third temperature threshold; reduce the opening of the water flow regulating valve of the external unit when the saturation temperature corresponding to the condensing pressure of the external unit is less than or equal to the fourth temperature threshold; keep the current opening of the water flow regulating valve of the external unit unchanged when the saturation temperature corresponding to the condensing pressure of the external unit is greater than the fourth temperature threshold and less than the third temperature threshold; and adjust the opening of the water flow regulating valve of the external unit to the maximum when the saturation temperature corresponding to the condensing pressure of the external unit is greater than or equal to the fifth temperature threshold for a first preset time in a row, wherein the fifth temperature threshold is greater than the third temperature threshold.

[0154] Optionally, the second control module 43 includes:

[0155] The second detection unit is used to detect the water inlet temperature of the outdoor unit;

[0156] The third control unit is used to increase the opening of the water flow regulating valve of the external unit when the water inlet temperature of the external unit is less than or equal to the sixth temperature threshold; reduce the opening of the water flow regulating valve of the external unit when the water inlet temperature of the external unit is greater than or equal to the seventh temperature threshold; and maintain the current opening of the water flow regulating valve of the external unit unchanged when the water inlet temperature of the external unit is greater than the sixth temperature threshold and less than the seventh temperature threshold.

[0157] Optionally, the second control module 43 includes:

[0158] A second acquisition unit is used to acquire the saturation temperature corresponding to the evaporation pressure of the outdoor unit;

[0159] The fourth control unit is used to increase the opening of the water flow regulating valve of the external unit when the saturation temperature corresponding to the evaporation pressure of the external unit is less than or equal to an eighth temperature threshold; reduce the opening of the water flow regulating valve of the external unit when the saturation temperature corresponding to the evaporation pressure of the external unit is greater than or equal to a ninth temperature threshold; maintain the current opening of the water flow regulating valve of the external unit when the saturation temperature corresponding to the evaporation pressure of the external unit is greater than the eighth temperature threshold and less than the ninth temperature threshold; and adjust the opening of the water flow regulating valve of the external unit to the maximum when any of the following conditions is met: (1) the saturation temperature corresponding to the evaporation pressure of the external unit is less than or equal to the tenth temperature threshold for a second consecutive preset time; (2) the difference between the gas outlet pipe temperature of the external unit and the saturation temperature corresponding to the evaporation pressure is less than or equal to the eleventh temperature threshold and the saturation temperature corresponding to the condensation pressure of the external unit is less than or equal to the third temperature threshold for a third consecutive preset time; wherein the tenth temperature threshold is less than the eighth temperature threshold.

[0160] Optionally, the water source multi-connection control device further includes:

[0161] A calculation module, used for calculating the average value of the water inlet temperature and the water outlet temperature of the outdoor unit in response to the shutdown instruction of the outdoor unit;

[0162] The third control module is used to adjust the opening of the water flow regulating valve of the external unit to the maximum when the average value is less than or equal to the twelfth temperature threshold; to close the water flow regulating valve of the external unit when the average value is greater than or equal to the thirteenth temperature threshold; and to keep the current opening of the water flow regulating valve of the external unit unchanged when the average value is greater than the twelfth temperature threshold and less than the thirteenth temperature threshold.

[0163] Optionally, the water source multi-split control device further includes: a fourth control module, which is used to respond to the start-up instruction of the external unit, adjust the opening of the water flow regulating valve of the external unit to the maximum, and then start the compressor of the external unit.

[0164] The above-mentioned water source multi-connection control device can execute the water source multi-connection control method provided in the above-mentioned embodiment, and has the corresponding functional modules and beneficial effects of executing the water source multi-connection control method. For technical details not fully described in this embodiment, please refer to the water source multi-connection control method provided in the above-mentioned embodiment.

[0165] The present application also provides a water source multi-split unit, comprising at least one external unit, a water flow regulating valve being arranged on the water inlet pipe of the external unit heat exchanger, and also comprising the water source multi-split unit control device described in the above embodiment.

[0166] The present application also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the water source multi-connection control method described in the above embodiment is implemented.

[0167] The present application also provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the multi-connected water source control method described in the above embodiment of the present application when executing the computer program.

[0168] like Figure 5 As shown, it is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application, and the electronic device includes a processor 111, a communication interface 112, a memory 113 and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114.

[0169] In some embodiments, the processor 111 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chips. The processor 111 is generally used to control the overall operation of the electronic device, such as performing control and processing related to data interaction or communication. In this embodiment, the processor 111 is used to run the program code stored in the memory 113 or process data, such as running the water source multi-connection control program code.

[0170] The communication interface 112 may optionally include a standard wired interface, a wireless interface (such as a WI-FI interface), and the communication interface 112 may also be used to establish a communication connection between the electronic device and other electronic devices.

[0171] The memory 113 is used to store computer programs, for example, a water source multi-connection control program. The memory 113 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a disk, an optical disk, etc. In some embodiments, the memory 113 may be an internal storage unit of the electronic device, such as a hard disk or memory of the electronic device. In other embodiments, the memory 113 may also be an external storage device of the electronic device, such as a plug-in hard disk equipped with the electronic device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Of course, the memory 113 may also include both the internal storage unit of the electronic device and its external storage device. In this embodiment, the memory 113 is generally used to store an operating system and various computer programs installed on the electronic device, such as a water source multi-connection control program code, etc. In addition, the memory 113 can also be used to temporarily store various types of data that have been output or are to be output.

[0172] Figure 5 Only an electronic device having components 111 - 114 is shown, but it is understood that implementing all of the components shown is not a requirement, and more or fewer components may alternatively be implemented.

[0173] In one embodiment of the present application, the processor 111 is used to implement the water source multi-connection control method provided by any one of the aforementioned method embodiments when executing the program stored in the memory 113.

[0174] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0175] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0176] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0177] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A water source multi-connection control method, characterized in that: A water flow regulating valve is arranged on the water inlet pipe of the external heat exchanger, and the method comprises: For any external unit in operation, determine the working mode of the external unit; In cooling mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the saturation temperature corresponding to the water inlet temperature or condensing pressure of the outdoor unit; In the heating mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the saturation temperature corresponding to the water inlet temperature or the evaporation pressure of the outdoor unit.

2. The method according to claim 1, characterized in that In cooling mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the water inlet temperature of the outdoor unit, including: Detect the water inlet temperature of the outdoor unit; When the water inlet temperature of the external unit is greater than or equal to a first temperature threshold, increasing the opening of the water flow regulating valve of the external unit; When the water inlet temperature of the external unit is less than or equal to the second temperature threshold, reducing the opening of the water flow regulating valve of the external unit; When the water inlet temperature of the external unit is greater than the second temperature threshold and less than the first temperature threshold, the current opening of the water flow regulating valve of the external unit is kept unchanged.

3. The method according to claim 1, characterized in that In the cooling mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the saturation temperature corresponding to the condensing pressure of the outdoor unit, including: Obtain the saturation temperature corresponding to the condensing pressure of the outdoor unit; When the saturation temperature corresponding to the condensing pressure of the external unit is greater than or equal to the third temperature threshold, increasing the opening of the water flow regulating valve of the external unit; When the saturation temperature corresponding to the condensing pressure of the external unit is less than or equal to the fourth temperature threshold, reducing the opening of the water flow regulating valve of the external unit; When the saturation temperature corresponding to the condensing pressure of the external unit is greater than the fourth temperature threshold and less than the third temperature threshold, the current opening of the water flow regulating valve of the external unit is kept unchanged; When the saturation temperature corresponding to the condensing pressure of the outdoor unit is greater than or equal to the fifth temperature threshold for a first preset time in a row, the opening of the water flow regulating valve of the outdoor unit is adjusted to the maximum, wherein the fifth temperature threshold is greater than the third temperature threshold.

4. The method according to claim 1, characterized in that: In the heating mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the water inlet temperature of the outdoor unit, including: Detect the water inlet temperature of the outdoor unit; When the water inlet temperature of the external unit is less than or equal to a sixth temperature threshold, increasing the opening of the water flow regulating valve of the external unit; When the water inlet temperature of the external unit is greater than or equal to the seventh temperature threshold, reducing the opening of the water flow regulating valve of the external unit; When the water inlet temperature of the external unit is greater than the sixth temperature threshold and less than the seventh temperature threshold, the current opening of the water flow regulating valve of the external unit is kept unchanged.

5. The method according to claim 1, characterized in that In the heating mode, the opening of the water flow regulating valve of the outdoor unit is controlled according to the saturation temperature corresponding to the evaporation pressure of the outdoor unit, including: Obtain the saturation temperature corresponding to the evaporation pressure of the outdoor unit; When the saturation temperature corresponding to the evaporation pressure of the outdoor unit is less than or equal to the eighth temperature threshold, increasing the opening of the water flow regulating valve of the outdoor unit; When the saturation temperature corresponding to the evaporation pressure of the outdoor unit is greater than or equal to a ninth temperature threshold, reducing the opening of the water flow regulating valve of the outdoor unit; When the saturation temperature corresponding to the evaporation pressure of the outdoor unit is greater than the eighth temperature threshold and less than the ninth temperature threshold, the current opening of the water flow regulating valve of the outdoor unit is kept unchanged; When any of the following conditions is met, the opening of the water flow regulating valve of the external unit is adjusted to the maximum: (1) the saturation temperature corresponding to the evaporation pressure of the external unit is less than or equal to the tenth temperature threshold for the second consecutive preset time; (2) the difference between the gas outlet pipe temperature of the external unit and the saturation temperature corresponding to the evaporation pressure is less than or equal to the eleventh temperature threshold for the third consecutive preset time, and the saturation temperature corresponding to the condensation pressure of the external unit is less than or equal to the third temperature threshold; wherein the tenth temperature threshold is less than the eighth temperature threshold.

6. The method according to any one of claims 1 to 5, characterized in that The method further comprises: In response to a shutdown instruction of the outdoor unit, calculating an average value of an inlet water temperature and an outlet water temperature of the outdoor unit; When the average value is less than or equal to the twelfth temperature threshold, adjusting the opening of the water flow regulating valve of the external unit to the maximum; When the average value is greater than or equal to the thirteenth temperature threshold, closing the water flow regulating valve of the external unit; When the average value is greater than the twelfth temperature threshold and less than the thirteenth temperature threshold, the current opening of the water flow regulating valve of the external unit is kept unchanged.

7. The method according to any one of claims 1 to 5, characterized in that The method further comprises: In response to the start-up instruction of the external unit, the opening of the water flow regulating valve of the external unit is adjusted to the maximum, and then the compressor of the external unit is started.

8. A water source multi-connection control device, characterized in that: A water flow regulating valve is arranged on the water inlet pipe of the external heat exchanger, and the device comprises: A determination module, used for determining the working mode of any external unit in a running state; A first control module is used to control the opening of the water flow regulating valve of the outdoor unit according to the saturation temperature corresponding to the water inlet temperature or condensation pressure of the outdoor unit in the cooling mode; The second control module is used to control the opening of the water flow regulating valve of the outdoor unit according to the saturation temperature corresponding to the water inlet temperature or evaporation pressure of the outdoor unit in the heating mode.

9. A water source multi-connector, characterized in that: include: The water source multi-connection control device as described in claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the water source multi-connection control method according to any one of claims 1 to 7 is implemented.

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