Control method of heat pump system, heat pump system and readable storage medium

Abstract

The application discloses a control method of a heat pump system, the heat pump system and a readable storage medium, and the method comprises the following steps: acquiring an outdoor environment temperature and a current temperature of a refrigerant pipe of the hydraulic module; and adjusting the operation frequency of a compressor according to the outdoor environment temperature and the current temperature, so as to improve the reliability of the heat pump system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning equipment, and in particular to a control method of a heat pump system, the heat pump system and a readable storage medium. BACKGROUND

[0002] With the development of economy and technology, the application of multi-split system in daily life is becoming more and more widespread. For example, the air source heat pump increases the hydraulic module, and can provide heat source to the water storage tank for domestic water. At present, in the process of heating water, the high-pressure side of the outdoor unit of the heat pump system exchanges heat with the low-pressure side of the hydraulic module, so as to achieve the purpose of producing high-temperature hot water or heating. However, if no high-low pressure sensor is installed on the heat exchanger of the hydraulic module, it is difficult to determine whether the high pressure of the hydraulic module is out of range in time when the hydraulic module is running, and it is difficult to ensure the reliability of the heat pump system. SUMMARY

[0003] The embodiments of the present application provide a control method of a heat pump system, the heat pump system, and a readable storage medium, aiming to improve the reliability of the heat pump system.

[0004] The embodiments of the present application provide a control method of a heat pump system, the heat pump system including an outdoor unit, at least two indoor units and a hydraulic module, the indoor units and the hydraulic module being connected to the outdoor unit, the hydraulic module and the indoor units being connected in parallel, the control method of the heat pump system including:

[0005] obtaining an outdoor environment temperature and a current temperature of a refrigerant pipe of the hydraulic module;

[0006] adjusting the operating frequency of the compressor according to the outdoor environment temperature and the current temperature.

[0007] Optionally, the step of adjusting the operating frequency of the compressor according to the outdoor environment temperature and the current temperature includes:

[0008] determining a temperature interval in which the outdoor environment temperature is located;

[0009] determining an adjustment mode of the compressor according to the temperature interval and the current temperature of the refrigerant pipe;

[0010] adjusting the operating frequency of the compressor according to the adjustment mode.

[0011] Optionally, the step of determining the temperature interval in which the outdoor environment temperature is located includes:

[0012] determining the operating state of the compressor according to the operating frequency of the compressor in a preset period of time, the operating state including frequency increase or frequency decrease;

[0013] According to the set outdoor environment temperature interval corresponding to the operation state, a temperature interval in which the outdoor environment temperature is located is determined.

[0014] Optionally, the critical value of the set outdoor environment temperature interval corresponding to the operation state is frequency increasing is greater than the critical value of the set outdoor environment temperature interval corresponding to the operation state is frequency decreasing.

[0015] Optionally, the step of determining the adjustment mode of the compressor according to the temperature interval and the current temperature of the refrigerant pipe comprises:

[0016] According to the temperature interval, a preset temperature interval set of the refrigerant pipe of the hydraulic module is determined.

[0017] According to the temperature interval set and the current temperature of the refrigerant pipe, the adjustment mode of the compressor is determined.

[0018] Optionally, the step of determining the adjustment mode of the compressor according to the temperature interval set and the current temperature of the refrigerant pipe comprises:

[0019] When the current temperature of the refrigerant pipe is greater than a first set temperature, the compressor is controlled to stop;

[0020] When the current temperature of the refrigerant pipe is less than the first set temperature and greater than a second set temperature, the compressor is controlled to operate at a preset operation frequency;

[0021] When the current temperature of the refrigerant pipe is less than the second set temperature and greater than a third set temperature, the compressor is controlled to operate at a current operation frequency;

[0022] When the current temperature of the refrigerant pipe is less than the third set temperature, the compressor is controlled to increase or decrease the frequency.

[0023] Optionally, the critical value of the preset temperature interval set of the refrigerant pipe of the hydraulic module corresponding to each temperature interval is different.

[0024] Optionally, the control method of the heat pump system further comprises:

[0025] When a heating instruction of the hydraulic module is received, the steps of acquiring the outdoor environment temperature and the current temperature of the refrigerant pipe of the hydraulic module are performed.

[0026] In addition, to achieve the above-mentioned purposes, the application further provides a heat pump system, which comprises a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor, and when the control program of the heat pump system is executed by the processor, the steps of the control method of the heat pump system are implemented.

[0027] Further, to achieve the above object, the present application also provides a computer readable storage medium storing a control program of a heat pump system, wherein the control program of the heat pump system, when executed by a processor, implements the steps of the control method of the heat pump system.

[0028] The technical scheme of the control method of the heat pump system, the heat pump system and the readable storage medium provided in the embodiments of the present application can obtain the outdoor environment temperature and the current temperature of the refrigerant pipe of the hydraulic module, and then adjust the operating frequency of the compressor according to the outdoor environment temperature and the current temperature. Thus, under different outdoor environment temperatures, the operating frequency of the compressor is adjusted according to the current temperature of the condensing pipe, the condensing temperature is changed, the compression ratio is reduced, the compression ratio of the compressor is within the operating range, and the reliability of the heat pump system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The structure schematic diagram of the heat pump system related to the embodiments of the present application is shown in the figure.

[0030] Figure 2 Another structure schematic diagram of the heat pump system related to the embodiments of the present application is shown in the figure.

[0031] Figure 3 The flow schematic diagram of the control method of the heat pump system of the first embodiment of the present application is shown in the figure.

[0032] Reference signs:

[0033] Hydraulic module 100; water flow path 101; water pump 110; water side heat exchanger 120; water flow pipe 121; heat exchange pipe 122; first refrigerant temperature sensor 123; second refrigerant temperature sensor 124; water inlet temperature sensor 125; water outlet temperature sensor 126; refrigerant pipe 127; water inlet pipe 130; water outlet pipe 140; expansion tank 150; automatic exhaust valve 160; water flow switch 170;

[0034] Outdoor unit 200; first refrigerant flow path 201; second refrigerant flow path 202; compressor 210; exhaust temperature sensor 211; vapor-liquid separator 212; outdoor heat exchanger 220; throttling device 230; capillary tube 231; first electronic expansion valve 232; second electronic expansion valve 233; third electronic expansion valve 234; four-way valve 240;

[0035] Indoor heat exchanger 300;

[0036] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. The above drawings are only one embodiment diagram, but not the whole application. DETAILED DESCRIPTION

[0037] It should be understood that the specific embodiments described herein are merely exemplary and do not limit the application.

[0038] Referring to Figure 1 In the operation of the heat pump system water module, the compressor of the outdoor unit compresses the high-temperature and high-pressure gaseous refrigerant discharged and exchanges heat with the low-temperature and low-pressure liquid refrigerant on the water side of the water module through the water side heat exchanger 120, and then returns to the outdoor heat exchanger 220 or other indoor units for heat exchange; the low-temperature and low-pressure liquid refrigerant on the water side of the water module absorbs heat from the high-temperature and high-pressure gaseous refrigerant of the outdoor unit, and the high-temperature and high-pressure gaseous refrigerant heats the water on the water side.

[0039] However, when the water temperature of the water module is low or the water temperature is normal and the water flow is large, the heat exchange temperature difference between the high-temperature side of the water module and the water side is large, that is, the temperature difference between the refrigerant pipe temperature and the water temperature on the water side is large, resulting in a low condensing pressure on the high-pressure side of the water module and a small refrigerant flow. Under the condition that the condensing pressure on the high-pressure side of the outdoor unit is basically unchanged, it is easy to cause the evaporation pressure on the low-pressure side of the water module to be high, the pressure difference between the high-pressure side and the low-pressure side to be small, and the compression ratio of the compressor to be too low, which easily causes the compression ratio of the compressor to be out of the operating range, affecting the reliability of the compressor.

[0040] The main technical solution adopted by the embodiment of the present application is: acquiring the outdoor environment temperature and the current temperature of the refrigerant pipe of the water module; and adjusting the operating frequency of the compressor according to the outdoor environment temperature and the current temperature. The above technical solution provided by the present application, in the heat pump system operating indoor unit heating and water module heating water mode, or in the water module heating water mode only, the heat pump system detects the outdoor environment temperature and the refrigerant pipe temperature of the water module, and performs protection control on the operating frequency of the compressor according to the outdoor environment temperature and the refrigerant pipe temperature of the water module, so that the compression ratio of the compressor is within the operating range, and the reliability of the heat pump system is improved.

[0041] As an implementation manner, the hardware environment architecture involved in the control method of the heat pump system can include an outdoor unit and a water module, and the water module is connected to the outdoor unit. Optionally, the hardware environment architecture involved in the control method of the heat pump system of the present application can also be as shown in Figure 1

[0042] Optionally, the heat pump system includes an outdoor unit 200, at least one indoor unit, and at least one water module 100, the indoor heat exchanger 300 of the indoor unit and the water module 100 are connected to the outdoor unit 200, and the water module 100 and the indoor unit are connected in parallel.

[0043] In other embodiments, the number of indoor units and water modules 100 can be set according to actual needs.

[0044] ​At least one hydraulic module 100 and at least two indoor units can be arranged in the same space or distributed in different space areas according to actual needs. Here, different space areas specifically refer to mutually separated space areas.

[0045] The indoor unit, the outdoor unit 200, the hydraulic module 100, and the connection relationship between each module are described in detail below.

[0046] The hydraulic module 100 includes a water pump 110, a water-side heat exchanger 120, a water inlet pipe 130, and a water outlet pipe 140. One end of the water inlet pipe 130 is a water inlet interface, and the other end is connected to the water inlet end of the water pump 110. The water outlet end of the water pump 110 is connected to the water-side heat exchanger 120. The water-side heat exchanger 120 is provided with a water flow pipe 121 and a heat exchange pipe 122. One end of the water flow pipe 121 is connected to the water outlet end of the water pump 110, and the other end of the water flow pipe 121 is connected to the water outlet pipe 140, thereby forming a water flow path 101. The water outlet pipe 140 is provided with an expansion tank 150, which balances the water volume and pressure of the water flow path 101. The end of the water outlet pipe 140 is provided with a water outlet interface. One end of the heat exchange pipe 122 is connected to the four-way valve 240, and the other end of the heat exchange pipe 122 is connected to the third electronic expansion valve 234, thereby forming a refrigerant pipe 127. The heat exchange pipe 122 is used to connect with the outdoor unit 200, and the water-side heat exchanger 120 exchanges heat between water and refrigerant, which can heat the water to obtain hot water, or cool the water, thereby providing water at a set temperature through the water flow path 101. The water inlet interface is connected to a water supply pipe, and the water outlet interface is connected to a domestic water equipment, which is suitable for air energy water heaters, floor heating, and the like.

[0047] Referring to Figure 1 As shown in the figure, it can be understood that the outdoor unit 200 includes a compressor 210, an outdoor heat exchanger 220, a throttling device 230, and a four-way valve 240. The compressor 210 is provided with an exhaust port and an intake port, and the four-way valve 240 is provided with a first valve port D, a second valve port S, a third valve port C, and a fourth valve port E. The exhaust port is connected to the first valve port D, and the intake port is connected to the second valve port S. One end of the outdoor heat exchanger 220 is connected to the third valve port C, and the other end is connected to the throttling device 230. The throttling device 230 is provided with a first refrigerant flow path 201 and a second refrigerant flow path 202 between the fourth valve port E. The first refrigerant flow path 201 and the second refrigerant flow path 202 are connected in parallel, the first refrigerant flow path 201 is connected to the indoor heat exchanger 300, and the second refrigerant flow path 202 is connected to the heat exchange pipe 122 of the water-side heat exchanger 120, so that the refrigerant can exchange heat through the indoor heat exchanger 300 and the water-side heat exchanger 120. The four-way valve 240 can switch one of the third valve port C and the fourth valve port E to communicate with the first valve port D, and the other one to communicate with the second valve port S, thereby realizing control of the flow direction of the refrigerant.

[0048] Referring toFigure 1 As shown, specifically, the refrigerant provided by the outdoor unit 200 can be exchanged by the indoor heat exchanger 300, so that heating or cooling of the indoor environment can be achieved. It should be noted that the indoor unit of the embodiment can be a vertical cabinet machine, a wall-mounted indoor unit, a ducted air conditioner, etc., and the specific type is not limited.

[0049] Referring to Figure 1 As shown, it can be understood that the outdoor unit 200 can provide refrigerant to the water module 100 and the indoor heat exchanger 300 for heat exchange, that is, the water module 100 and the indoor unit share the same outdoor unit 200.

[0050] It should be noted that the indoor unit and the water module 100 can be operated at the same time, and at this time the outdoor unit 200 can simultaneously deliver refrigerant to the water module 100 and the indoor heat exchanger 300. Taking heating as an example for description, referring to Figure 1 As shown, the first valve port D of the four-way valve 240 is in communication with the fourth valve port E, and the second valve port S is in communication with the third valve port C. The high-temperature refrigerant discharged from the exhaust port of the compressor 210 passes through the first valve port D and the fourth valve port E in sequence. Part of the refrigerant flows to the indoor heat exchanger 300 through the first refrigerant flow path 201 for heat exchange, thereby heating the indoor environment. Another part of the refrigerant flows to the water-side heat exchanger 120 through the second refrigerant flow path 202, so that the refrigerant exchanges heat with water, and the water flow path 101 generates hot water and is delivered to the water-using equipment through the water outlet pipe 140. The refrigerant after heat exchange passes through the throttling device 230, the outdoor heat exchanger 220, and the four-way valve 240 in sequence and returns to the compressor 210.

[0051] Referring to Figure 1 As shown, it can be understood that in some embodiments, the outdoor unit 200 further comprises a switch valve (not shown in the figure), which is arranged in the second refrigerant flow path 202. The switch valve can open or close the second refrigerant flow path 202. When the switch valve is opened, the heat exchange pipeline 122 is connected, and at this time the refrigerant can exchange heat with the water-side heat exchanger 120. When the switch valve is closed, the heat exchange pipeline 122 is disconnected, and at this time the refrigerant does not flow through the water-side heat exchanger 120. It can be understood that considering that the water module 100 is mainly used to provide hot water to air energy water heaters or floor heating and the like, when the indoor unit needs to be cooled, low-temperature refrigerant will flow through the first refrigerant flow path 201, at this time the water-side heat exchanger 120 does not need to exchange heat with the refrigerant to produce cold water, therefore the second refrigerant flow path 202 can be closed by the switch valve, and the water pump 110 stops working, that is, the water module 100 does not work, so that the water temperature of the water-using equipment is not affected when the indoor unit is cooled.

[0052] Referring to Figure 1As shown, it can be understood that the throttling device 230 of the embodiment includes a first electronic expansion valve 232, a second electronic expansion valve 233, a third electronic expansion valve 234, and a capillary tube 231. Taking the first electronic expansion valve 232 as an example, one end of the first electronic expansion valve 232 is connected with the first refrigerant flow path 201, and the other end is connected with one end of the capillary tube 231, and the other end of the capillary tube 231 is connected with the outdoor heat exchanger 220. During heating, the refrigerant is throttled by the first electronic expansion valve 232 and the capillary tube 231 in sequence after heat exchange through the first refrigerant flow path 201 and the second refrigerant flow path 202. The first electronic expansion valve 232 and the capillary tube 231 both have the function of throttling and reducing pressure, that is, the refrigerant is throttled by two stages. It should be noted that, compared with the throttling structure using only one electronic expansion valve or capillary tube, the embodiment throttles the refrigerant by two stages, which can further reduce the refrigerant pressure, increase the liquid refrigerant, and is beneficial to increase the refrigerant flow and improve the heat exchange efficiency.

[0053] Referring to Figure 1 As shown, it can be understood that in some embodiments, the first refrigerant temperature sensor 123 is arranged at the inlet end of the heat exchange pipeline 122, and the second refrigerant temperature sensor 124 is arranged at the outlet end of the heat exchange pipeline 122. The first refrigerant temperature sensor 123 can be used to detect the temperature of the refrigerant before entering the water-side heat exchanger 120, and the second refrigerant temperature sensor 124 can be used to detect the temperature of the refrigerant after heat exchange through the water-side heat exchanger 120. In the embodiment, the first refrigerant temperature sensor 123 and the second refrigerant temperature sensor 124 can be connected with the electric control board. The temperature collected by the first refrigerant temperature sensor 123 and the second refrigerant temperature sensor 124 can be used to determine the state of the refrigerant, so as to determine the running state of the outdoor unit 200. It should be noted that the compressor 210 of the embodiment is a variable frequency compressor, and the running frequency of the compressor 210 can be controlled to adjust the temperature of the refrigerant, so as to achieve the purpose of adjusting the water temperature.

[0054] Referring to Figure 1 As shown, it should be noted that in the embodiment, the discharge temperature sensor 211 is arranged between the discharge port of the compressor 210 and the first valve port D. The gas-liquid separator 212 is arranged between the suction port of the compressor 210 and the suction port. The discharge temperature sensor 211 is used to detect the discharge temperature of the compressor 210, so as to determine whether the compressor 210 is running normally.

[0055] It can be understood that, taking heating as an example, the outdoor heat exchanger 220 is an evaporator, the high-temperature and high-pressure refrigerant is discharged from the exhaust port, passes through the four-way valve 240 to enter the indoor heat exchanger 300 and the water-side heat exchanger 120 for heat exchange, the refrigerant is fully depressurized and cooled after heat exchange through the first electronic expansion valve 232 and the capillary tube 231, and then enters the evaporator. After the liquid refrigerant is evaporated, it enters the vapor-liquid separator 212 through the four-way valve 240 for complete vapor-liquid separation and returns to the suction port of the compressor 210. The vapor-liquid separator 212 not only ensures sufficient separation of vapor and liquid, but also ensures that the system has sufficient refrigerant amount.

[0056] With reference to Figure 1 As shown in FIG. 13, in the embodiment, the water inlet of the water flow pipeline 121 is provided with a water inlet temperature sensor 125, and the water outlet of the water flow pipeline 121 is provided with a water outlet temperature sensor 126. The water inlet temperature sensor 125 can be used to detect the temperature of the water flow before entering the water-side heat exchanger 120, and the water outlet temperature sensor 126 can be used to detect the temperature of the water flow after heat exchange in the water-side heat exchanger 120. In the embodiment, the water inlet temperature sensor 125 and the water outlet temperature sensor 126 are connected with the electric control board. The temperature collected by the water inlet temperature sensor 125 and the water outlet temperature sensor 126 can be used to determine the change state of the water temperature, so as to determine the running state of the water power module 100, and it can be quickly judged whether the water power module 100 is normally running.

[0057] It should be noted that, in the embodiment, the water-side heat exchanger 120 is a plate heat exchanger or a double-pipe heat exchanger. The plate heat exchanger and the double-pipe heat exchanger both include the water flow pipeline 121 and the heat exchange pipeline 122. Heat exchange is performed between the water flow pipeline 121 and the heat exchange pipeline 122, the heat of the refrigerant is transferred to the water, so as to heat the water and achieve the purpose of producing hot water.

[0058] With reference to Figure 1 As shown in FIG. 13, in the embodiment, the water power module 100 further includes an automatic exhaust valve 160 and a water flow switch 170. The automatic exhaust valve 160, the water flow switch 170 and the expansion tank 150 are all connected to the pipeline between the water-side heat exchanger 120 and the water outlet interface. The automatic exhaust valve 160 is used to exhaust the gas in the water flow path 101, so as to relieve the pressure of the water flow path 101. The water flow switch 170 is used to detect whether the water flow is normal. The water flow switch 170 can feed back the detected water flow signal to the electric control board.

[0059] Optionally, the control method of the heat pump system involves a hardware architecture including the heat pump system or a control terminal of the heat pump system, and the control terminal is used to control the heat pump system.

[0060] As an implementation manner, with reference to Figure 2The heat pump system or the control terminal comprises a processor 101, such as a CPU, a memory 102, and a communication bus 103. The communication bus 103 is used to realize the connection and communication among the components. The processor 102 is used to call an application program to perform a control operation.

[0061] The memory 102 can be a high-speed RAM memory or a stable memory, such as a disk memory.

[0062] It can be understood that, in an embodiment, a control program for realizing the control process of the heat pump system is stored in the memory 102 of the heat pump system or in a computer readable storage medium, and the processor 101 calls the control program from the memory 102 or the computer readable storage medium to perform the following operations:

[0063] Obtain an outdoor environment temperature and a current temperature of a refrigerant pipe of the water module.

[0064] Adjust the operating frequency of the compressor according to the outdoor environment temperature and the current temperature.

[0065] In order to better understand the above technical solutions, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0066] As shown in FIG. 1, in the first embodiment of the present application, the control method of the heat pump system of the present application comprises the following steps: Figure 3

[0067] Step S110, obtain an outdoor environment temperature and a current temperature of a refrigerant pipe of the water module.

[0068] Optionally, the current operating mode of the heat pump system can be obtained, and when the current operating mode is a heat pump system heating and hot water mode, the outdoor environment temperature and the current temperature of the refrigerant pipe of the water module are obtained. The current operating mode of the heat pump system can also be obtained, and when the current operating mode is a hot water mode, the outdoor environment temperature and the current temperature of the refrigerant pipe of the water module are obtained.

[0069] ​Optionally, the outdoor ambient temperature refers to the current outdoor ambient temperature. The outdoor ambient temperature can be detected by a corresponding temperature sensor. For example, an outdoor ambient temperature sensor can be arranged on the outdoor heat exchanger of the outdoor unit, and the outdoor ambient temperature can be collected by the outdoor ambient temperature sensor. The outdoor ambient temperature can also be detected by other terminal devices and sent, provided that the heat pump system is communicatively connected to the terminal device, which can be a smart device such as a mobile phone.

[0070] Optionally, the outdoor ambient temperature in a preset time period can be obtained, the outdoor ambient temperature average value is calculated according to the outdoor ambient temperature in the preset time period, and the outdoor ambient temperature average value is determined as the outdoor ambient temperature, so that the obtained outdoor ambient temperature is more accurate.

[0071] Optionally, the outdoor ambient temperature can be obtained when the water module receives a hot water heating instruction or after receiving the hot water heating instruction for a preset time. Alternatively, the outdoor ambient temperature can be obtained when the water module receives a hot water heating instruction and the heat pump system receives a heating instruction. Alternatively, the outdoor ambient temperature can be obtained according to the energy demand of the water module, for example, when the energy demand of the water module reaches a preset energy demand. By setting different conditions for obtaining the outdoor ambient temperature in different scenarios, the flexibility of obtaining the outdoor ambient temperature is increased.

[0072] Optionally, the refrigerant pipe can be a refrigerant gas pipe or a refrigerant liquid pipe. The current temperature of the refrigerant pipe is the condensation temperature. When the outdoor ambient temperature is high, the water inlet temperature is generally high, and it is relatively easy to achieve the desired water outlet temperature. When the outdoor ambient temperature is low, the water inlet temperature is generally low, and when the water inlet temperature of the water module is low, the temperature difference between the high-temperature side of the water module and the water side heat exchange is large, that is, the temperature difference between the refrigerant pipe temperature and the water inlet temperature of the water side is large, resulting in a lower condensation pressure on the high-pressure side of the water module and a small refrigerant flow. Under the condition that the condensation pressure on the high-pressure side of the outdoor unit is basically unchanged, it is easy to cause the evaporation pressure on the low-pressure side of the water module to be relatively high, the pressure difference between the high-pressure side and the low-pressure side is small, and the compression ratio of the compressor is too low, which can easily cause the compression ratio of the compressor to exceed the operating range.

[0073] In step S120, the operating frequency of the compressor is adjusted according to the outdoor ambient temperature and the current temperature.

[0074] Optionally, after determining the outdoor ambient temperature and the current temperature, the operating frequency of the compressor is adjusted based on the outdoor ambient temperature and the current temperature. When the outdoor ambient temperature changes, the operating frequency of the compressor is adjusted according to the current temperature of the condensation pipe under different outdoor ambient temperatures, the condensation temperature is changed, the compression ratio is reduced, the compression ratio of the compressor is within the operating range, and the reliability of the heat pump system is improved.

[0075] Optionally, the step of adjusting the operating frequency of the compressor according to the outdoor ambient temperature and the current temperature comprises:

[0076] In step S121, the temperature interval in which the outdoor ambient temperature is located is determined.

[0077] Optionally, the outdoor ambient temperature can be divided into a plurality of temperature intervals according to actual conditions or experience (as shown in Table 1 below), and a plurality of refrigerant pipe temperature intervals are divided under each temperature interval of the outdoor ambient temperature, and each refrigerant pipe temperature interval has a corresponding adjustment mode of the operating frequency of the compressor. So that under each outdoor ambient temperature, the operating frequency of the compressor can be finely adjusted according to the refrigerant pipe temperature. By the zoning control method of the outdoor ambient temperature, the limitation of the operating pressure ratio can be realized; and the refrigerant pipe temperature is zoned in each outdoor ambient temperature interval, and then the operating frequency of the compressor is controlled, so that the high pressure and high pressure ratio protection control of the hydraulic module are realized.

[0078] Optionally, the operating state of the compressor can also be determined according to the operating frequency of the compressor in a preset period, and the temperature interval in which the outdoor ambient temperature is located is determined according to the outdoor ambient temperature interval corresponding to the operating state of the compressor. Wherein, the change trend of the operating frequency of the compressor can be determined according to the operating frequency of the compressor at each time in the preset period, and then the operating state of the compressor is determined based on the change trend. Optionally, the operating frequency of the compressor in the preset period can be plotted into a frequency change curve, a standard frequency change curve matched with the frequency change curve is determined, and the preset operating state of the compressor associated with the standard frequency change curve is determined as the operating state of the current compressor.

[0079] Optionally, the operating state includes a frequency increasing state and a frequency decreasing state. The frequency increasing state is a state in which the operating frequency of the compressor increases, and the frequency decreasing state is a state in which the operating state of the compressor decreases. Taking hot water as an example, when the hot water function is turned on, the operating frequency of the compressor increases to quickly increase the water temperature. When the water temperature reaches a certain temperature, the operating frequency of the compressor decreases and tends to be stable. When the compressor is in different operating states, the temperature interval corresponding to the outdoor ambient temperature is different, so that the compressor can quickly locate the temperature interval in which the outdoor ambient temperature is located, and adjust the compression ratio to the operating range regardless of the frequency increasing or decreasing.

[0080] Optionally, when the compressor is in the frequency increasing state, the temperature interval corresponding to the outdoor ambient temperature is obtained, and the temperature interval is taken as the temperature interval in which the outdoor ambient temperature is located. When the compressor is in the frequency decreasing state, the temperature interval corresponding to the outdoor ambient temperature is obtained, and the temperature interval is taken as the temperature interval in which the outdoor ambient temperature is located.

[0081] The outdoor ambient temperature can be divided into a plurality of temperature intervals according to actual conditions, as shown in Table 1:

[0082] Table 1

[0083]

[0084] Wherein, T4_1 can be 30-40℃, preferably 35℃. T4_2 can be -5-5℃, preferably 0℃. T4_3 can be -15--7℃, preferably -10℃. T0 represents the difference between T4 when the running frequency is reduced and when the running frequency is increased, which can be 1-3℃, preferably 2℃.

[0085] Exemplarily, assuming that the current outdoor environment temperature is 33℃, the temperature interval corresponding to the current outdoor environment temperature can be the temperature interval when the running frequency is increased, i.e. T4>T4_1, or the temperature interval when the running frequency is reduced, i.e. T4>T4_1-T0. Assuming that the current running state of the compressor is the frequency-increasing state, the temperature interval corresponding to the outdoor environment temperature is T4>T4_1, and T4>T4_1 is determined as the temperature interval in which the current outdoor environment temperature is located. Assuming that the current running state of the compressor is the frequency-reducing state, the temperature interval corresponding to the outdoor environment temperature is T4>T4_1-T0, and T4>T4_1-T0 is determined as the temperature interval in which the current outdoor environment temperature is located. In this way, the compressor can quickly locate the temperature interval in which the outdoor environment temperature is located, regardless of whether the compressor is frequency-increasing or frequency-reducing.

[0086] Optionally, it is known from Table 2 that the critical value of the set outdoor environment temperature interval corresponding to the frequency-increasing state is greater than the critical value of the set outdoor environment temperature interval corresponding to the frequency-reducing state.

[0087] In step S122, the adjustment mode of the compressor is determined according to the temperature interval and the current temperature of the refrigerant pipe.

[0088] Optionally, when the outdoor environment temperature is high, the outdoor environment temperature set corresponding to the outdoor environment temperature can be obtained, and the temperature interval in which the current outdoor environment temperature is located is obtained from the outdoor environment temperature set. The preset refrigerant pipe temperature interval set associated with the temperature interval is obtained, and the adjustment mode of the compressor is determined according to the temperature interval set and the current temperature of the refrigerant pipe. Wherein, each refrigerant pipe temperature interval has a corresponding adjustment mode of the compressor. The target refrigerant pipe temperature interval corresponding to the current temperature of the current refrigerant pipe is selected from the refrigerant pipe temperature interval set, and the preset adjustment mode of the compressor associated with the target refrigerant pipe temperature interval is determined as the adjustment mode of the current compressor. After adjustment based on the adjustment mode, the compression ratio of the compressor can be located within the operating range, and the reliability of the heat pump system is improved.

[0089] Optionally, the refrigerant pipe temperature interval can be divided in advance according to the temperature interval of the outdoor environment temperature. Specifically, according to the temperature interval of the outdoor environment temperature, the corresponding refrigerant pipe temperature determination value is set to form a plurality of refrigerant pipe temperature intervals associated with each temperature interval of the outdoor environment temperature. Wherein, the refrigerant pipe temperature interval divided according to the temperature interval of the outdoor environment temperature is shown in Table 2, taking the running frequency rise as an example.

[0090] Optionally, the adjustment mode of the compressor includes but is not limited to: shutdown, frequency limiting, keeping and normal. Optionally, according to the temperature interval and the current temperature of the refrigerant pipe, the determination of the adjustment mode of the compressor according to Table 2 includes: when the current temperature of the refrigerant pipe is greater than the first set temperature, the compressor is controlled to stop; when the current temperature of the refrigerant pipe is less than the first set temperature and greater than the second set temperature, the compressor is controlled to run at a preset running frequency; when the current temperature of the refrigerant pipe is less than the second set temperature and greater than the third set temperature, the compressor is controlled to run at the current running frequency; when the current temperature of the refrigerant pipe is less than the third set temperature, the compressor is controlled to increase or decrease the frequency.

[0091] Wherein, the first set temperature, the second set temperature and the third set temperature decrease in turn.

[0092] According to the temperature interval where T4 is located, the determination value of TR_in of the corresponding temperature interval is set, see Table 2 below.

[0093] Table 2

[0094]

[0095] Wherein, the interval between the three TR_in1, TR_in2 and TR_in3 can be selected as 2-4℃, preferably 3℃.

[0096] For example, when the current temperature TR_in of the refrigerant pipe is greater than TR_in1_1, the compressor is controlled to stop, wherein TR_in1_1 is the first set temperature. When the current temperature TR_in of the refrigerant pipe is greater than TR_in1_1 and less than TR_in2_1, the compressor is controlled to run at a preset running frequency, wherein TR_in2_1 is the second set temperature, and the preset running frequency can be determined according to the actual situation, that is, the effect of frequency limiting is realized. When the current temperature TR_in of the refrigerant pipe is greater than TR_in2_1 and less than TR_in3_1, the compressor is controlled to keep the current running frequency, wherein TR_in3_1 is the third set temperature. When the current temperature TR_in of the refrigerant pipe is less than TR_in3_1, the compressor is controlled to increase or decrease the frequency.

[0097] Optionally, each temperature interval has a corresponding preset temperature interval set of the hydraulic module refrigerant pipe. The critical value of each preset temperature interval set of the hydraulic module refrigerant pipe is different. For example, the critical value of the temperature interval one shutdown is TR_in1_1, and the critical value of the temperature interval two shutdown is TR_in1_2.

[0098] In step S123, the operating frequency of the compressor is adjusted according to the adjustment mode.

[0099] According to the above technical solution, the outdoor environment temperature and the current temperature of the refrigerant pipe of the hydraulic module can be obtained, and the operating frequency of the compressor is adjusted according to the outdoor environment temperature and the current temperature. In different outdoor environment temperatures, the operating frequency of the compressor is adjusted according to the current temperature of the condenser pipe, the condensation temperature is changed, the compression ratio is reduced, the compression ratio of the compressor is within the operating range, and the reliability of the heat pump system is improved.

[0100] According to the above technical solution, the outdoor environment temperature and the current temperature of the refrigerant pipe of the hydraulic module can be obtained, and the operating frequency of the compressor is adjusted according to the outdoor environment temperature and the current temperature. In different outdoor environment temperatures, the operating frequency of the compressor is adjusted according to the current temperature of the condenser pipe, the condensation temperature is changed, the compression ratio is reduced, the compression ratio of the compressor is within the operating range, and the reliability of the heat pump system is improved.

[0101] The embodiments of the control method of the heat pump system are provided, and it should be noted that although the logical sequence is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown.

[0102] Based on the same inventive concept, the embodiments of the present application also provide a computer readable storage medium, which stores a control program of a heat pump system. The control program of the heat pump system is executed by a processor to realize each step of the control method of the heat pump system as described above, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0103] The storage medium provided by the embodiments of the present application is a storage medium used to implement the method of the embodiments of the present application. Therefore, based on the method introduced in the embodiments of the present application, the specific structure and modification of the storage medium can be understood by those skilled in the art, and therefore will not be described here. Any storage medium used by the method of the embodiments of the present application belongs to the scope of the present application.

[0104] It should be noted that, in this document, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0105] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0106] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of software and the necessary general hardware platform, of course, they can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) as described above, and includes a number of instructions for making a terminal device (which can be a mobile phone, a computer, a server, a television, or a network device, etc.) execute the methods described in the various embodiments of the present application.

[0107] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A control method for a heat pump system, characterized in that, The heat pump system includes an outdoor unit and a hydraulic module, the hydraulic module being connected to the outdoor unit, and the control method for the heat pump system includes: Obtain the outdoor ambient temperature and the current temperature of the refrigerant pipes of the hydraulic module; The operating state of the compressor is determined based on the operating frequency of the compressor within a preset time period, and the operating state includes frequency increase or frequency decrease; Based on the set outdoor ambient temperature range corresponding to the operating state, determine the temperature range in which the outdoor ambient temperature is located; Determine the preset temperature range set for the hydraulic module refrigerant pipes based on the aforementioned temperature range; When the current temperature of the refrigerant pipe is greater than the first set temperature, the compressor is controlled to stop. When the current temperature of the refrigerant pipe is lower than the first set temperature but higher than the second set temperature, the compressor is controlled to operate at a preset operating frequency. When the current temperature of the refrigerant pipe is lower than the second set temperature but higher than the third set temperature, the compressor is controlled to operate at the current operating frequency. When the current temperature of the refrigerant pipe is lower than the third set temperature, the compressor is controlled to increase or decrease its frequency; wherein the first set temperature, the second set temperature, and the third set temperature decrease sequentially.

2. The control method for a heat pump system as described in claim 1, characterized in that, The operating state is the critical value of the set outdoor ambient temperature range corresponding to the frequency increase, which is greater than the critical value of the set outdoor ambient temperature range corresponding to the frequency decrease.

3. The control method for a heat pump system as described in claim 1, characterized in that, The critical values ​​of the set of temperature ranges of the preset hydraulic module refrigerant pipes corresponding to each of the aforementioned temperature ranges are different.

4. The control method for a heat pump system as described in claim 1, characterized in that, The control method for the heat pump system further includes: When a heating command is received from the hydraulic module, the steps of obtaining the outdoor ambient temperature and the current temperature of the refrigerant pipe of the hydraulic module are executed.

5. A heat pump system, characterized in that, The heat pump system includes: a memory, a processor, and a control program for the heat pump system stored in the memory and executable on the processor. When the control program for the heat pump system is executed by the processor, it implements the steps of the control method for the heat pump system as described in any one of claims 1-4.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a control program for a heat pump system, which, when executed by a processor, implements the steps of the control method for the heat pump system according to any one of claims 1-4.

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