Heat pump air conditioning system control method and device, storage medium and heat pump air conditioning system

Abstract

The invention discloses a heat pump air conditioning system control method and device, a storage medium and a heat pump air conditioning system, and belongs to the technical field of air conditioners. The method comprises the steps that the current operation frequency and the current refrigerant pipeline pressure of a compressor are obtained; according to the current operation frequency and the current refrigerant pipeline pressure, whether the water-fluorine heat exchanger has inner leakage or not is detected; and when it is detected that the water-fluorine heat exchanger has inner leakage, the running state of the heat pump air conditioning system is adjusted, whether inner leakage of the water-fluorine heat exchanger exists or not is judged by recognizing the pressure change rate, the accuracy rate is higher, meanwhile, a pressure sensor is used for being arranged on a refrigerant outlet pipeline connected with the water-fluorine heat exchanger, and the water-fluorine heat exchanger does not have inner leakage. And buffer pipes are arranged on the refrigerant inlet pipeline and the refrigerant outlet pipeline respectively, so that the cost is lower, and meanwhile, sufficient closing response time can be given to the electronic expansion valve and the block valve when damage and inner leakage occur.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a control method, device, storage medium and heat pump air conditioning system for a heat pump air conditioning system. Background Art

[0002] In the prior art, a water-fluorine heat exchanger is likely to be frozen and cracked or corroded at low temperatures, resulting in leakage. Once internal leakage occurs in the water-fluorine heat exchanger, refrigerant leakage will occur, and cooling water or chilled water will enter the refrigerant system, causing damage to the entire unit. In the currently proposed technical solution, the heat pump air conditioning system includes a compressor and a plate heat exchanger connected to the suction port of the compressor through a refrigerant pipeline, and further includes: a first valve connected to the refrigerant inlet pipeline of the heat exchanger; a second valve connected to the refrigerant outlet pipeline of the heat exchanger; a first pressure sensor disposed between the first valve and the refrigerant inlet of the heat exchanger; and a controller that issues a control signal according to the comparison result between the sensed pressure of the first pressure sensor and the saturation pressure of the refrigerant to control the opening and closing of the compressor, the first valve, and the second valve. By controlling the opening and closing of the two valves, internal leakage of the plate heat exchanger is effectively prevented, and after internal leakage occurs, invasion of cooling water into other components of the unit is prevented, reducing losses caused by internal leakage of the heat exchanger.

[0003] However, this technical solution requires the use of two pressure sensors, which is costly. Moreover, once internal leakage occurs in the water-fluorine heat exchanger, the speed is extremely fast. However, the opening and closing of the valves require execution time, and there is still a risk of leakage when relying solely on the valves to prevent cooling water from invading other components.

[0004] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present invention is to provide a control method, device, storage medium and heat pump air conditioning system for a heat pump air conditioning system, aiming to solve the technical problems in the prior art that two pressure sensors are required, the cost is high, and once internal leakage occurs in the water-fluorine heat exchanger, the speed is extremely fast, but the opening and closing of the valves require execution time, and there is still a risk of leakage when relying solely on the valves to prevent cooling water from invading other components.

[0006] To achieve the above object, the present invention provides a control method for a heat pump air-conditioning system. The heat pump air-conditioning system includes a compressor, a reversing device, a heat exchanger, and a water-fluorine heat exchanger. A pressure sensor, a cut-off valve, and a stop valve are sequentially arranged on the refrigerant outlet pipeline connected to the water-fluorine heat exchanger. An electronic expansion valve is sequentially arranged on the refrigerant inlet pipeline connected to the water-fluorine heat exchanger. Buffer pipes are respectively arranged on the refrigerant outlet pipeline and the refrigerant inlet pipeline. The cut-off valve and the electronic expansion valve are used to prevent the cooling water leaking from the water-fluorine heat exchanger from flowing into the refrigerant side. The buffer pipe is used to reduce the flow rate of the cooling water leaking from the water-fluorine heat exchanger. The control method for the heat pump air-conditioning system includes:

[0007] Obtain the current operating frequency of the compressor and the current refrigerant pipeline pressure;

[0008] Detect whether the water-fluorine heat exchanger has internal leakage according to the current operating frequency and the current refrigerant pipeline pressure; and,

[0009] When it is detected that the water-fluorine heat exchanger has internal leakage, adjust the operating state of the heat pump air-conditioning system. The operating state at least includes the operating states of the compressor, the water pump, the cut-off valve, and the electronic expansion valve.

[0010] Optionally, it is characterized in that the detection of whether the water-fluorine heat exchanger has internal leakage according to the current operating frequency and the current refrigerant pipeline pressure includes:

[0011] Determine the frequency change rate of the compressor according to the current operating frequency;

[0012] Determine the pressure change rate of the refrigerant pipeline according to the current refrigerant pipeline pressure; and,

[0013] Detect whether the water-fluorine heat exchanger has internal leakage according to the frequency change rate and the pressure change rate.

[0014] Optionally, the detection of whether the water-fluorine heat exchanger has internal leakage according to the frequency change rate and the pressure change rate includes:

[0015] If the frequency change rate is less than the frequency change rate threshold and the pressure change rate is greater than the first pressure change rate threshold, it is determined that the water-fluorine heat exchanger has internal leakage.

[0016] Optionally, the detection of whether the water-fluorine heat exchanger has internal leakage according to the frequency change rate and the pressure change rate includes:

[0017] If the rate of change of frequency is greater than or equal to the frequency change rate threshold and the rate of change of pressure is greater than the second pressure change rate threshold, it is determined that there is an internal leak in the water-fluorine heat exchanger, and the second pressure change rate threshold is greater than the first pressure change rate threshold.

[0018] Optionally, adjusting the operating state of the heat pump air-conditioning system includes:

[0019] Controlling the compressor to stop operating, and closing the water pump, the cut-off valve, and the electronic expansion valve.

[0020] Optionally, the cut-off valve is disposed between the water-fluorine heat exchanger and the buffer pipe, and the method further includes:

[0021] Outputting a fault prompt for an internal leak in the water-fluorine heat exchanger to identify a false alarm of the internal leak by opening the cut-off valve;

[0022] If a false alarm of the internal leak is identified, closing the cut-off valve, and controlling the compressor to run again, and opening the water pump, the cut-off valve, and the electronic expansion valve.

[0023] Optionally, identifying a false alarm of the internal leak by opening the cut-off valve includes:

[0024] Detecting whether water is discharged after the cut-off valve is opened; and,

[0025] If it is detected that water is discharged after the cut-off valve is opened, it is determined that there is a false alarm of the internal leak.

[0026] In addition, to achieve the above object, the present invention further provides a control device for a heat pump air-conditioning system. The heat pump air-conditioning system includes a compressor, a reversing device, a heat exchanger, and a water-fluorine heat exchanger. A pressure sensor, a cut-off valve, and a stop valve are sequentially arranged on the refrigerant outlet pipeline connected to the water-fluorine heat exchanger. An electronic expansion valve is sequentially arranged on the refrigerant inlet pipeline connected to the water-fluorine heat exchanger. Buffer pipes are respectively arranged on the refrigerant outlet pipeline and the refrigerant inlet pipeline. The cut-off valve and the electronic expansion valve are used to prevent the cooling water leaked from the water-fluorine heat exchanger from flowing into the refrigerant side. The buffer pipe is used to reduce the flow rate of the cooling water leaked from the water-fluorine heat exchanger. The control device for the heat pump air-conditioning system includes:

[0027] An acquisition module, configured to acquire the current operating frequency of the compressor and the current refrigerant pipeline pressure;

[0028] A detection module, configured to detect whether there is an internal leak in the water-fluorine heat exchanger according to the current operating frequency and the current refrigerant pipeline pressure; and,

[0029] A control module, configured to adjust the operating state of the heat pump air-conditioning system when it detects an internal leak in the water-fluorine heat exchanger, where the operating state at least includes the operating states of the compressor, the water pump, the cut-off valve, and the electronic expansion valve.

[0030] In addition, to achieve the above object, the present invention also provides a heat pump air-conditioning system, which includes: a memory, a processor, and a heat pump air-conditioning system control program stored on the memory and running on the processor, where the heat pump air-conditioning system control program is configured to implement the heat pump air-conditioning system control method as described above.

[0031] In addition, to achieve the above object, the present invention also provides a storage medium, on which a heat pump air-conditioning system control program is stored, and when the heat pump air-conditioning system control program is executed by a processor, it implements the heat pump air-conditioning system control method as described above.

[0032] The present invention obtains the current operating frequency of the compressor and the current refrigerant pipeline pressure; detects whether there is an internal leak in the water-fluorine heat exchanger according to the current operating frequency and the current refrigerant pipeline pressure; and when it detects an internal leak in the water-fluorine heat exchanger, adjusts the operating state of the heat pump air-conditioning system. By identifying the pressure change rate to determine whether there is an internal leak in the water-fluorine heat exchanger, the accuracy is higher. At the same time, a pressure sensor is set on the refrigerant outlet pipeline connected to the water-fluorine heat exchanger, and buffer pipes are also respectively set on the refrigerant inlet pipeline and the refrigerant outlet pipeline, so that the cost is lower, and at the same time, sufficient closing response time can be given to the electronic expansion valve and the cut-off valve when there is a breakage and internal leak. Description of the Drawings

[0033] Figure 1 is a schematic structural diagram of a heat pump air-conditioning system in the hardware operating environment related to the embodiment solution of the present invention;

[0034] Figure 2 is a schematic flowchart of the first embodiment of the heat pump air-conditioning system control method of the present invention;

[0035] Figure 3 is a schematic structural diagram of a heat pump air-conditioning system in an embodiment of the heat pump air-conditioning system control method of the present invention;

[0036] Figure 4 is another schematic structural diagram of a heat pump air-conditioning system in an embodiment of the heat pump air-conditioning system control method of the present invention;

[0037] Figure 5 is a schematic flowchart of the second embodiment of the heat pump air-conditioning system control method of the present invention;

[0038] Figure 6This is a structural block diagram of the first embodiment of the control device for the heat pump air conditioning system of the present invention.

[0039] Description of the reference numerals:

[0040]

[0041]

[0042] The realization of the object of the present invention, functional characteristics and advantages will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0043] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] Refer to Figure 1 , Figure 1 This is a schematic structural diagram of a heat pump air conditioning system for the hardware operating environment involved in the embodiment solution of the present invention.

[0045] As Figure 1 shown, the heat pump air conditioning system may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display) and an input unit such as a keyboard (Keyboard). Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0046] Those skilled in the art can understand that Figure 1 the structure shown in

[0047] does not constitute a limitation on the heat pump air conditioning system, and may include more or fewer components than shown in the figure, or combine some components, or different component arrangements. Figure 1 shown, the memory 1005, as a storage medium, may include an operating system, a network communication module, a user interface module, and a control program for the heat pump air conditioning system.

[0048] In Figure 1 the shown heat pump air conditioning system, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the heat pump air conditioning system of the present invention can be arranged in the heat pump air conditioning system. The heat pump air conditioning system calls a heat pump air conditioning system control program stored in the memory 1005 through the processor 1001 and executes the heat pump air conditioning system control method provided by the embodiments of the present invention.

[0049] Embodiments of the present invention provide a heat pump air conditioning system control method. Referring to Figure 2 , Figure 2 is a schematic flowchart of a first embodiment of a heat pump air conditioning system control method of the present invention.

[0050] In this embodiment, the heat pump air conditioning system control method includes the following steps:

[0051] Step S10: Obtain the current operating frequency of the compressor and the current refrigerant pipeline pressure.

[0052] In this embodiment, the execution subject of this embodiment can be the heat pump air conditioning system control device. The heat pump air conditioning system control device has functions such as data processing, data communication, and program operation. The heat pump air conditioning system control device can be a controller inside the heat pump air conditioning system. Of course, it can also be other devices with similar functions, and this embodiment is not limited thereto. For ease of explanation, this embodiment is described by taking the heat pump air conditioning system control device as an example.

[0053] It should be noted that in the currently proposed technical solution, the heat pump air conditioning system includes a compressor, a plate heat exchanger connected to the suction port of the compressor through a refrigerant pipeline, and further includes: a first valve connected to the refrigerant inlet pipeline of the heat exchanger; a second valve connected to the refrigerant outlet pipeline of the heat exchanger; a first pressure sensor arranged between the first valve and the refrigerant inlet of the heat exchanger; a controller that issues a control signal according to the comparison result between the sensed pressure of the first pressure sensor and the saturation pressure of the refrigerant to control the opening / closing of the compressor, the first valve, and the second valve. By controlling the opening and closing of the two valves, the internal leakage of the plate heat exchanger is effectively prevented, and after the internal leakage occurs, the intrusion of cooling water into other components of the unit is prevented, reducing the loss caused by the internal leakage of the heat exchanger. However, this technical solution requires the use of two pressure sensors, with high costs, and once the water-fluorine heat exchanger leaks, the speed is extremely fast. However, the opening and closing of the valves require execution time, and there is still a leakage risk in preventing the intrusion of cooling water into other components only by the valves.

[0054] To solve the above technical problems, in this embodiment, the current operating frequency of the compressor and the current refrigerant pipeline pressure are obtained; whether there is an internal leak in the water-fluorine heat exchanger is detected according to the current operating frequency and the current refrigerant pipeline pressure; and when it is detected that there is an internal leak in the water-fluorine heat exchanger, the operating state of the heat pump air-conditioning system is adjusted. By identifying the pressure change rate to determine whether there is an internal leak in the water-fluorine heat exchanger, the accuracy is higher. At the same time, a pressure sensor is arranged on the refrigerant outlet pipeline connected to the water-fluorine heat exchanger, and buffer pipes are respectively arranged on the refrigerant inlet pipeline and the refrigerant outlet pipeline, so that the cost is lower. At the same time, sufficient closing response time can be given to the electronic expansion valve and the cut-off valve when there is a breakage and internal leak. Specifically, it can be implemented in the following manner.

[0055] In specific implementation, in this embodiment, a structure of a heat pump air-conditioning system is first proposed, and the specific structure can be referred to Figure 3 as shown. The heat pump air-conditioning system in this embodiment includes a compressor 1, an oil return hole 2, an oil-gas separator 3, a low-pressure switch 4, a high-pressure switch 5, a four-way valve 6, a fan 7, a heat exchanger 8, a water-fluorine heat exchanger 9, an electronic expansion valve 10, a cut-off valve 11, a pressure sensor 12, a buffer pipe 13, a stop valve 14, a water flow switch 15, an expansion tank 16, and a water pump 17. Compared with the existing solution, in this embodiment, a pressure sensor 12 is arranged on the refrigerant outlet pipeline connected to the water-fluorine heat exchanger 9. At the same time, the cut-off valve 11 and the stop valve 14 are also arranged on the refrigerant outlet pipeline. The electronic expansion valve 10 is sequentially arranged on the refrigerant inlet pipeline. And in order to give sufficient response time to the cut-off valve 11 and the electronic expansion valve 10, buffer pipes 13 are respectively arranged on the refrigerant outlet pipeline and the refrigerant inlet pipeline. When there is an internal leak, the cut-off valve 11 and the electronic expansion valve 10 can effectively prevent the cooling water leaking from the water-fluorine heat exchanger from flowing into the refrigerant side. At the same time, the buffer pipe 13 can reduce the flow rate of the cooling water leaking from the water-fluorine heat exchanger, so that the cut-off valve 11 and the electronic expansion valve 10 have enough time to close.

[0056] It should be noted that in this embodiment Figure 3 as shown is the all-in-one air-to-water and water-to-floor heating system. The all-in-one air-to-water and water-to-floor heating system further includes an air-side pipe 18 and a liquid-side pipe 19. Except Figure 3 for this, in this embodiment, it can also be Figure 4 as shown of the all-in-one water-to-air and water-to-floor heating system. Compared with Figure 3 , Figure 4 in which the air-side pipe 18 and the liquid-side pipe 19 do not need to be arranged.

[0057] In specific implementation, in this embodiment, the current operating frequency of the compressor and the current refrigerant pipeline pressure need to be obtained first, and the current refrigerant pipeline pressure can be collected by the above-mentioned pressure sensor.

[0058] Step S20: Detect whether there is an internal leak in the water-fluorine heat exchanger according to the current operating frequency and the current refrigerant pipeline pressure.

[0059] In a specific implementation, after obtaining the current operating frequency and the current refrigerant pipeline pressure, in this embodiment, whether there is an internal leak in the water-fluorine heat exchanger is detected according to the current operating frequency and the current refrigerant pipeline pressure. Specifically, the internal leak detection of the water-fluorine heat exchanger can be performed according to the frequency change rate corresponding to the current operating frequency and the pressure change rate corresponding to the current refrigerant pipeline pressure.

[0060] Step S30: When it is detected that there is an internal leak in the water-fluorine heat exchanger, adjust the operating state of the heat pump air-conditioning system.

[0061] In a specific implementation, when it is detected that there is an internal leak in the water-fluorine heat exchanger, in order to prevent the cooling water of the water-fluorine heat exchanger from flowing into the refrigerant side, the method adopted in this embodiment is to adjust the operating state of the heat pump air-conditioning system. Among them, adjusting the operating state of the heat pump air-conditioning system at least includes adjusting the operating states of the compressor, the water pump, the cut-off valve, and the electronic expansion valve. Specifically, when it is detected that there is an internal leak in the water-fluorine heat exchanger, in this embodiment, the compressor is controlled to stop operating, and the water pump, the cut-off valve, and the electronic expansion valve are closed.

[0062] Further, after performing the above operations, in this embodiment, a fault prompt of an internal leak in the water-fluorine heat exchanger will be output to remind the user. In order to avoid false alarms, in this embodiment, the identification of false alarms of internal leaks can be further performed by opening a stop valve. The stop valve can be a manual stop valve, that is, it needs to be manually opened by the user. The stop valve can also be an electric two-way valve, and the stop valve is opened electrically without manual operation. The setting form of the stop valve in this embodiment is not limited. If a false alarm of an internal leak is detected, the stop valve can be closed, and then the heat pump air-conditioning system is controlled to resume operation again, that is, the compressor is controlled to operate again, and the water pump, the cut-off valve, and the electronic expansion valve are opened.

[0063] It should be noted that in this embodiment, whether there is a false alarm is detected based on whether there is water discharged after the stop valve is opened. If there is water discharged from the stop valve, there is no false alarm. On the contrary, if there is no water discharged from the stop valve, it is determined that a false alarm has occurred.

[0064] In this embodiment, the current operating frequency of the compressor and the current refrigerant pipeline pressure are obtained; whether there is an internal leak in the water-fluorine heat exchanger is detected according to the current operating frequency and the current refrigerant pipeline pressure; and when it is detected that there is an internal leak in the water-fluorine heat exchanger, the operating state of the heat pump air-conditioning system is adjusted. By identifying the pressure change rate to determine whether there is an internal leak in the water-fluorine heat exchanger, the accuracy is higher. At the same time, a pressure sensor is arranged on the refrigerant outlet pipeline connected to the water-fluorine heat exchanger, and buffer pipes are respectively arranged on the refrigerant inlet pipeline and the refrigerant outlet pipeline, so that the cost is lower. At the same time, sufficient closing response time can be given to the electronic expansion valve and the cut-off valve when there is a breakage and internal leak.

[0065] Reference Figure 5 , Figure 5 is a schematic flow chart of the second embodiment of a control method for a heat pump air-conditioning system according to the present invention.

[0066] Based on the above first embodiment, in the control method of the heat pump air-conditioning system of this embodiment, the step S20 specifically includes:

[0067] Step S201: Determine the frequency change rate of the compressor according to the current operating frequency.

[0068] Step S202: Determine the pressure change rate of the refrigerant pipeline according to the current refrigerant pipeline pressure.

[0069] In specific implementation, the frequency change rate of the compressor can be calculated according to the current operating frequency, and the pressure change rate can be calculated according to the current refrigerant pipeline pressure.

[0070] Step S203: Detect whether there is an internal leak in the water-fluorine heat exchanger according to the frequency change rate and the pressure change rate.

[0071] In specific implementation, in this embodiment, the calculated frequency change rate of the compressor and the pressure change rate need to be respectively compared with their corresponding change rate thresholds, and the internal leak detection of the water-fluorine heat exchanger is further realized according to the comparison results.

[0072] Specifically, if the frequency change rate is less than the frequency change rate threshold and the pressure change rate is greater than the first pressure change rate threshold, in this case, it is determined in this embodiment that there is an internal leak in the water-fluorine heat exchanger. If the frequency change rate is greater than or equal to the frequency change rate threshold, in this embodiment, the pressure change rate is compared with the second pressure change rate threshold. If the pressure change rate is greater than the second pressure change rate threshold, it can be determined that there is an internal leak in the water-fluorine heat exchanger. The second pressure change rate threshold in this embodiment is greater than the first pressure change rate threshold. The above frequency change rate threshold, the first pressure change rate threshold, and the second pressure change rate threshold can be set according to actual needs, and this embodiment does not limit this.

[0073] In this embodiment, the rate of change of the frequency of the compressor is determined according to the current operating frequency, the rate of change of the pressure of the refrigerant pipeline is determined according to the current refrigerant pipeline pressure, and whether there is an internal leak in the water-fluorine heat exchanger is detected according to the rate of change of the frequency and the rate of change of the pressure. By using the rate of change of the frequency of the compressor and the rate of change of the pressure of the refrigerant pipeline to detect the internal leak of the water-fluorine heat exchanger, the detection accuracy is improved and the cost is reduced at the same time.

[0074] In addition, an embodiment of the present invention further provides a storage medium, on which a control program for a heat pump air-conditioning system is stored. When the control program for the heat pump air-conditioning system is executed by a processor, the steps of the heat pump air-conditioning system control method described above are implemented.

[0075] Since this storage medium adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.

[0076] Refer to Figure 6 , Figure 6 which is a structural block diagram of the first embodiment of the control device for the heat pump air-conditioning system of the present invention.

[0077] As Figure 6 shown, the control device for the heat pump air-conditioning system proposed in the embodiment of the present invention includes:

[0078] An acquisition module 10, configured to acquire the current operating frequency of the compressor and the current refrigerant pipeline pressure.

[0079] It should be noted that in the currently proposed technical solution, the heat pump air-conditioning system includes a compressor, a plate heat exchanger connected to the suction port of the compressor through a refrigerant pipeline, and further includes: a first valve connected to the refrigerant inlet pipeline of the heat exchanger; a second valve connected to the refrigerant outlet pipeline of the heat exchanger; a first pressure sensor disposed between the first valve and the refrigerant inlet of the heat exchanger; and a controller that issues a control signal according to the comparison result between the sensed pressure of the first pressure sensor and the saturation pressure of the refrigerant to control the opening / closing of the compressor, the first valve, and the second valve. By controlling the opening and closing of the two valves, the internal leak of the plate heat exchanger is effectively prevented, and after the internal leak occurs, the cooling water is prevented from invading other components of the unit, reducing the loss caused by the internal leak of the heat exchanger. However, this technical solution requires the use of two pressure sensors, which is costly, and once the water-fluorine heat exchanger leaks, the speed is extremely fast, but the opening and closing of the valve require execution time, and there is still a risk of leakage when only relying on the valve to prevent the cooling water from invading other components.

[0080] In order to solve the above technical problems, this embodiment obtains the current operating frequency of the compressor and the current refrigerant pipeline pressure; detects whether the water-fluorine heat exchanger has internal leakage according to the current operating frequency and the current refrigerant pipeline pressure; and when the water-fluorine heat exchanger has internal leakage, adjusts the operating state of the heat pump air-conditioning system, and determines whether there is internal leakage in the water-fluorine heat exchanger by identifying the pressure change rate, which has higher accuracy. At the same time, a pressure sensor is set on the refrigerant outlet pipeline connected to the water-fluorine heat exchanger, and buffer tubes are respectively set on the refrigerant inlet pipeline and the refrigerant outlet pipeline, so that the cost is lower. At the same time, when damage and internal leakage occur, the electronic expansion valve and the shut-off valve can be given sufficient closing response time. Specifically, it can be achieved as follows.

[0081] In the specific implementation, this embodiment first proposes a structure of a heat pump air conditioning system. The specific structure can refer to Figure 3 The heat pump air conditioning system in this embodiment includes a compressor 1, an oil return hole 2, an oil-gas separator 3, a low-pressure switch 4, a high-pressure switch 5, a four-way valve 6, a fan 7, a heat exchanger 8, a water-fluorine heat exchanger 9, an electronic expansion valve 10, a shut-off valve 11, a pressure sensor 12, a buffer tube 13, a stop valve 14, a water flow switch 15, an expansion tank 16 and a water pump 17. Compared with the existing solution, a pressure sensor 12 is arranged on the refrigerant outlet pipeline connected to the water-fluorine heat exchanger 9 in this embodiment, and the shut-off valve 11 and the stop valve 14 are also arranged on the refrigerant outlet pipeline. An electronic expansion valve 10 is sequentially arranged on the refrigerant inlet pipeline, and in order to provide the shut-off valve 11 and the electronic expansion valve 10 with sufficient response time, a buffer tube 13 is respectively arranged on the refrigerant outlet pipeline and the refrigerant inlet pipeline. When internal leakage occurs, the shut-off valve 11 and the electronic expansion valve 10 can effectively prevent the cooling water leaked from the water-fluorine heat exchanger from flowing into the refrigerant side, and the buffer tube 13 can reduce the flow rate of the cooling water leaked from the water-fluorine heat exchanger, so that the shut-off valve 11 and the electronic expansion valve 10 have sufficient time to close.

[0082] It is worth noting that in this embodiment Figure 3 The fluorine-water system shown in the figure includes a gas side pipe 18 and a liquid side pipe 19. Figure 3 In addition, in this embodiment, Figure 4 Compared with the sky, water and ground water shown Figure 3 , Figure 4 There is no need to set the gas side pipe 18 and the liquid side pipe 19.

[0083] In a specific implementation, in this embodiment, it is necessary to first obtain the current operating frequency of the compressor and the current refrigerant pipeline pressure. The current refrigerant pipeline pressure can be collected by the pressure sensor provided above.

[0084] The detection module 20 is configured to detect whether there is an internal leak in the water-fluorine heat exchanger according to the current operating frequency and the current refrigerant pipeline pressure.

[0085] In a specific implementation, after obtaining the current operating frequency and the current refrigerant pipeline pressure, in this embodiment, it is detected whether there is an internal leak in the water-fluorine heat exchanger according to the current operating frequency and the current refrigerant pipeline pressure. Specifically, the internal leak of the water-fluorine heat exchanger can be detected according to the frequency change rate corresponding to the current operating frequency and the pressure change rate corresponding to the current refrigerant pipeline pressure.

[0086] The control module 30 is configured to adjust the operating state of the heat pump air-conditioning system when it is detected that there is an internal leak in the water-fluorine heat exchanger.

[0087] In a specific implementation, when it is detected that there is an internal leak in the water-fluorine heat exchanger, in order to prevent the cooling water of the water-fluorine heat exchanger from flowing into the refrigerant side, the method adopted in this embodiment is to adjust the operating state of the heat pump air-conditioning system. Among them, adjusting the operating state of the heat pump air-conditioning system at least includes adjusting the operating states of the compressor, the water pump, the cut-off valve, and the electronic expansion valve. Specifically, when it is detected that there is an internal leak in the water-fluorine heat exchanger, in this embodiment, the compressor is controlled to stop operating, and the water pump, the cut-off valve, and the electronic expansion valve are closed.

[0088] Furthermore, after performing the above operations, in this embodiment, a fault prompt for the internal leak of the water-fluorine heat exchanger will be output to remind the user. In order to avoid false alarms, in this embodiment, the internal leak false alarm can be further identified by opening the stop valve. The stop valve can be a manual stop valve, that is, the user needs to manually open it. The stop valve can also be an electric two-way valve, and the stop valve can be opened electrically without manual operation. The setting form of the stop valve in this embodiment is not limited. If a false alarm of internal leak is detected, the stop valve can be closed, and then the heat pump air-conditioning system is controlled to resume operation again, that is, the compressor is controlled to run again, and the water pump, the cut-off valve, and the electronic expansion valve are opened.

[0089] It should be noted that in this embodiment, whether there is a false alarm is detected based on whether there is water discharged after the stop valve is opened. If there is water discharged from the stop valve, there is no false alarm. On the contrary, if there is no water discharged from the stop valve, it is determined that a false alarm has occurred.

[0090] In this embodiment, the current operating frequency of the compressor and the current refrigerant pipeline pressure are obtained; whether there is an internal leak in the water-fluorine heat exchanger is detected according to the current operating frequency and the current refrigerant pipeline pressure; and when it is detected that there is an internal leak in the water-fluorine heat exchanger, the operating state of the heat pump air-conditioning system is adjusted. By identifying the pressure change rate to determine whether there is an internal leak in the water-fluorine heat exchanger, the accuracy is higher. At the same time, a pressure sensor is arranged on the refrigerant outlet pipeline connected to the water-fluorine heat exchanger, and buffer pipes are respectively arranged on the refrigerant inlet pipeline and the refrigerant outlet pipeline, so that the cost is lower. At the same time, when there is a breakage and internal leak, sufficient closing response time can be given to the electronic expansion valve and the cut-off valve.

[0091] In one embodiment, the detection module 20 is further configured to determine the frequency change rate of the compressor according to the current operating frequency; determine the pressure change rate of the refrigerant pipeline according to the current refrigerant pipeline pressure; and detect whether there is an internal leak in the water-fluorine heat exchanger according to the frequency change rate and the pressure change rate.

[0092] In one embodiment, the detection module 20 is further configured to determine that there is an internal leak in the water-fluorine heat exchanger if the frequency change rate is less than the frequency change rate threshold and the pressure change rate is greater than the first pressure change rate threshold.

[0093] In one embodiment, the detection module 20 is further configured to determine that there is an internal leak in the water-fluorine heat exchanger if the frequency change rate is greater than or equal to the frequency change rate threshold and the pressure change rate is greater than the second pressure change rate threshold, and the second pressure change rate threshold is greater than the first pressure change rate threshold.

[0094] In one embodiment, the control module 30 is further configured to control the compressor to stop running, and close the water pump, the cut-off valve, and the electronic expansion valve.

[0095] In one embodiment, the control module 30 is further configured to output a fault prompt for internal leak of the water-fluorine heat exchanger to identify false alarms of internal leak by opening the cut-off valve; if a false alarm of internal leak is identified, close the cut-off valve, and control the compressor to run again, and open the water pump, the cut-off valve, and the electronic expansion valve.

[0096] In one embodiment, the detection module 20 is further configured to detect whether there is water discharge after the cut-off valve is opened; and if it is detected that there is water discharge after the cut-off valve is opened, determine that there is a false alarm of internal leak.

[0097] It should be understood that the above is only for illustration and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not make any restrictions.

[0098] It should be noted that the workflow described above is only illustrative and does not limit the scope of protection of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the solution of this embodiment, and no limitation is made here.

[0099] In addition, for the technical details not described in detail in this embodiment, reference can be made to the control method of the heat pump air conditioning system provided in any embodiment of the present invention, and no further elaboration will be made here.

[0100] In addition, it should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or system including that element.

[0101] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0102] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that makes a contribution to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, magnetic disk, optical disk), and includes several instructions to enable a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0103] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

[0104] It should be understood that although the steps in the flowchart in the embodiments of the present application are displayed in sequence according to the arrows, these steps do not necessarily need to be executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and they can be executed in other orders. Moreover, at least a part of the steps in the figure may include multiple sub-steps or multiple stages. These sub-steps or stages do not necessarily need to be completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or sub-steps or stages of other steps.

Claims

1. A control method for a heat pump air - conditioning system, characterized in that, the heat pump air - conditioning system includes a compressor, a reversing device, a heat exchanger, and a water - fluorine heat exchanger. A pressure sensor, a cut - off valve, and a stop valve are sequentially arranged on the refrigerant outlet pipeline connected to the water - fluorine heat exchanger. An electronic expansion valve is sequentially arranged on the refrigerant inlet pipeline connected to the water - fluorine heat exchanger. Buffer pipes are respectively arranged on the refrigerant outlet pipeline and the refrigerant inlet pipeline. The cut - off valve and the electronic expansion valve are used to prevent the cooling water leaking from the water - fluorine heat exchanger from flowing into the refrigerant side. The buffer pipe is used to reduce the flow rate of the cooling water leaking from the water - fluorine heat exchanger. The heat pump air - conditioning system control method includes: Obtaining the current operating frequency of the compressor and the current refrigerant pipeline pressure; Detecting whether the water - fluorine heat exchanger has internal leakage according to the current operating frequency and the current refrigerant pipeline pressure; and, When detecting that the water - fluorine heat exchanger has internal leakage, adjusting the operating state of the heat pump air - conditioning system, where the operating state at least includes the operating states of the compressor, the water pump, the cut - off valve, and the electronic expansion valve.

2. The heat pump air - conditioning system control method according to claim 1, characterized in that, the detecting whether the water - fluorine heat exchanger has internal leakage according to the current operating frequency and the current refrigerant pipeline pressure includes: Determining the frequency change rate of the compressor according to the current operating frequency; Determining the pressure change rate of the refrigerant pipeline according to the current refrigerant pipeline pressure; and, Detecting whether the water - fluorine heat exchanger has internal leakage according to the frequency change rate and the pressure change rate.

3. The heat pump air - conditioning system control method according to claim 2, characterized in that, the detecting whether the water - fluorine heat exchanger has internal leakage according to the frequency change rate and the pressure change rate includes: If the frequency change rate is less than the frequency change rate threshold and the pressure change rate is greater than the first pressure change rate threshold, it is determined that the water - fluorine heat exchanger has internal leakage.

4. The heat pump air - conditioning system control method according to claim 3, characterized in that, the detecting whether the water - fluorine heat exchanger has internal leakage according to the frequency change rate and the pressure change rate includes: If the frequency change rate is greater than or equal to the frequency change rate threshold and the pressure change rate is greater than the second pressure change rate threshold, it is determined that the water - fluorine heat exchanger has internal leakage, and the second pressure change rate threshold is greater than the first pressure change rate threshold.

5. The heat pump air - conditioning system control method according to claim 1, characterized in that, the adjusting the operating state of the heat pump air - conditioning system includes: Controlling the compressor to stop operating, and closing the water pump, the cut - off valve, and the electronic expansion valve.

6. The heat pump air - conditioning system control method according to claim 1, characterized in that, the stop valve is arranged between the water - fluorine heat exchanger and the buffer pipe, and the method further includes: Outputting a water - fluorine heat exchanger internal leakage fault prompt to identify the internal leakage false alarm by opening the stop valve; If an internal leakage false alarm is recognized, close the stop valve and control the compressor to run again, and turn on the water pump, the cut-off valve, and the electronic expansion valve.

7. The control method of a heat pump air-conditioning system according to claim 6, characterized in that the recognition of the internal leakage false alarm by opening the stop valve includes: detecting whether water is discharged after the stop valve is opened; and if water is detected to be discharged after the stop valve is opened, it is determined that there is an internal leakage false alarm.

8. A control device for a heat pump air-conditioning system, characterized in that the heat pump air-conditioning system includes a compressor, a reversing device, a heat exchanger, and a water-fluorine heat exchanger. A pressure sensor, a cut-off valve, and a stop valve are sequentially arranged on the refrigerant outlet pipeline connected to the water-fluorine heat exchanger. An electronic expansion valve is sequentially arranged on the refrigerant inlet pipeline connected to the water-fluorine heat exchanger. Buffer pipes are respectively arranged on the refrigerant outlet pipeline and the refrigerant inlet pipeline. The cut-off valve and the electronic expansion valve are used to prevent the cooling water leaking from the water-fluorine heat exchanger from flowing into the refrigerant side. The buffer pipe is used to reduce the flow rate of the cooling water leaking from the water-fluorine heat exchanger. The control device for the heat pump air-conditioning system includes: an acquisition module for acquiring the current operating frequency and the current refrigerant pipeline pressure of the compressor; a detection module for detecting whether the water-fluorine heat exchanger has an internal leakage according to the current operating frequency and the current refrigerant pipeline pressure; and a control module for adjusting the operating state of the heat pump air-conditioning system when it is detected that the water-fluorine heat exchanger has an internal leakage, and the operating state at least includes the operating states of the compressor, the water pump, the cut-off valve, and the electronic expansion valve.

9. A heat pump air-conditioning system, characterized in that the heat pump air-conditioning system includes: a memory, a processor, and a heat pump air-conditioning system control program stored on the memory and running on the processor. The heat pump air-conditioning system control program is configured to implement the control method of the heat pump air-conditioning system according to any one of claims 1 to 7.

10. A storage medium, characterized in that a heat pump air-conditioning system control program is stored on the storage medium, and when the heat pump air-conditioning system control program is executed by a processor, it implements the control method of the heat pump air-conditioning system according to any one of claims 1 to 7.

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