A control method and device for a heat pump system, a heat pump system and a storage medium

Abstract

The present invention discloses a control method, device, heat pump system and storage medium for a heat pump system, the method comprising: when the heat pump system is turned on, obtaining the refrigerant inlet temperature and refrigerant outlet temperature of the refrigerant heat exchange pipeline; if it is determined that the water pump of the water system is not turned on and the water flow switch is in the on state, then detecting whether there is water in the water system according to the refrigerant inlet temperature and refrigerant outlet temperature of the refrigerant heat exchange pipeline, and obtaining a detection result; according to the detection result, controlling the operation process of the heat pump system to realize shutdown protection of the heat pump system when there is no water in the water system, and controlling the heat pump system to continue to operate when there is water in the water system. This scheme ensures the safety of the heat pump system by detecting the state of water or no water in the heat pump system according to the temperature of the refrigerant inlet and outlet sides of the heat exchanger end when the heat pump system is not shut down and the water flow switch is short-circuited, and performing shutdown protection.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat pump systems, and specifically relates to a control method, device, heat pump system and storage medium for a heat pump system, and more particularly to a control method, device, heat pump system and storage medium for detecting whether there is water in a heat pump system. Background Art

[0002] The heat pump system has been rapidly developed due to its advantages of energy saving, environmental protection, safe and stable operation. During the operation of the unit of the heat pump system that uses water for heat exchange, it is usually judged whether there is water flow in the heat pump system by the on-off of the water flow switch. The water flow switch judges whether there is water flowing in the heat pump system by the water flow pushing the target plate in the water flow switch to conduct the electrical signal after the water flow reaches the on-off value. When the water flow does not reach the on-off value of the water flow switch, the unit will report a water flow switch protection fault and shut down. After the water flow is restored, the unit will resume operation.

[0003] After the unit is installed, the installer will generally short-circuit the water flow switch during the debugging process, that is, in order to prevent the water flow switch from frequently reporting protection faults, the water flow switch is always kept in the on state. Regardless of whether there is water flow in the heat pump system, the water flow switch is always in the on state and will not report protection faults. Or, when the user is in use, the water pressure is low, the water flow in the heat pump system is small, and it does not reach the on-off value of the water flow switch, but there is water in the heat pump system, which does not affect the operation of the unit. In order to prevent the water flow switch from reporting protection faults, the user will short-circuit the water flow switch, that is, keep the water flow switch in the on state. However, in the above two situations or other reasons (such as short-circuiting due to water flow switch failure), the water flow switch is always in the on state. When there is no water in the heat pump system, the water flow switch cannot report protection faults. When the water circuit of the heat pump system is frozen, blocked, or there is no water flow, there is no shutdown protection when the water flow switch is short-circuited, which will cause the heat exchanger pipeline of the heat pump system to burst and the entire unit to be scrapped.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a control method, device, heat pump system and storage medium for a heat pump system, so as to solve the problem that when the heat pump system is not shut down and the water flow switch of the heat pump system is short-circuited, the heat pump system cannot detect whether there is water in the heat pump system according to the water flow switch for shutdown protection, and when the water path of the heat pump system is frozen, blocked, or there is no water flow, it will cause safety hazards such as bursting of heat exchanger pipes of the heat pump system and scrapping of the whole machine, which seriously affects the safety of the heat pump system. When the heat pump system is not shut down and the water flow switch of the heat pump system is short-circuited, the heat pump system can be shut down for protection according to the temperature of the refrigerant inlet and outlet sides of the heat exchanger end, so as to avoid safety hazards such as bursting of heat exchanger pipes of the heat pump system and scrapping of the whole machine when the water path of the heat pump system is frozen, blocked, or there is no water flow, which is beneficial to ensure the safety of the heat pump system.

[0006] The present invention provides a control method for a heat pump system, wherein the heat pump system has a water-side heat exchanger; the water-side heat exchanger has a water heat exchange pipeline and a refrigerant heat exchange pipeline, the water heat exchange pipeline is arranged in the water system of the heat pump system, and the refrigerant heat exchange pipeline is arranged in the refrigerant system of the heat pump system; when the heat pump system operates normally, the water heat exchange pipeline and the refrigerant heat exchange pipeline can exchange heat; the water heat exchange pipeline has a water outlet and a water inlet, and a water flow switch is arranged on the pipeline where the water outlet of the water heat exchange pipeline is located; the refrigerant heat exchange pipeline has a refrigerant outlet and a refrigerant inlet; the control method of the heat pump system comprises: when the heat pump system is turned on, obtaining the temperature of the refrigerant inlet of the refrigerant heat exchange pipeline, recorded as the refrigerant inlet temperature of the refrigerant heat exchange pipeline; and obtaining the refrigerant heat exchange pipeline temperature. The temperature of the refrigerant outlet is recorded as the refrigerant outlet temperature of the refrigerant heat exchange pipeline; determine whether the water pump of the water system is not turned on, and determine whether the water flow switch is in the on state; if it is determined that the water pump of the water system is not turned on, and the water flow switch is in the on state, then detect whether there is water in the water system according to the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and obtain a detection result to realize the detection of whether there is water in the water system when the water pump of the water system is not turned on and the water flow switch is on; according to the detection result, the operation process of the heat pump system is controlled to realize the shutdown protection of the heat pump system when there is no water in the water system, and control the heat pump system to continue to operate when there is water in the water system.

[0007] In some embodiments, whether there is water in the water system is detected based on the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and the detection result is obtained, including: determining whether the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or determining whether the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is within a set temperature range; if it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or determining whether the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, If the absolute value of the temperature difference between the refrigerant outlet temperatures of the refrigerant heat exchange pipeline is within the set temperature range, it is determined that there is no water in the water system, and the detection result is that the water pump of the water system is not turned on, and there is no water in the water system; if it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is different from the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is not within the set temperature range, it is determined that there is water in the water system, and the detection result is that the water pump of the water system is not turned on, but there is water in the water system.

[0008] In some embodiments, the operation process of the heat pump system is controlled according to the detection result, including: when the detection result is that the water pump of the water system is not turned on and there is no water in the water system, the heat pump system is controlled to shut down, and a reminder message of the heat pump system failure is initiated, and it is determined that the reason why the water flow switch is in the on state is that the water flow switch is short-circuited; when the detection result is that the water pump of the water system is not turned on, but there is water in the water system, the heat pump system is controlled to continue running, and it is determined that the reason why the water pump of the water system is not turned on, but there is water in the water system is that other water pumps supply water to the water system.

[0009] In some embodiments, it also includes: when there is water in the water system and the heat pump system is controlled to continue to operate, determining whether the continued operation time of the heat pump system has reached the set operation time; if it is determined that the continued operation time of the heat pump system has reached the set operation time, returning to re-detect whether there is water in the water system based on the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline.

[0010] In accordance with the above method, the present invention provides a control device for a heat pump system on the other hand, wherein the heat pump system has a water-side heat exchanger; the water-side heat exchanger has a water heat exchange pipeline and a refrigerant heat exchange pipeline, the water heat exchange pipeline is arranged in the water system of the heat pump system, and the refrigerant heat exchange pipeline is arranged in the refrigerant system of the heat pump system; when the heat pump system operates normally, the water heat exchange pipeline and the refrigerant heat exchange pipeline can exchange heat; the water heat exchange pipeline has a water outlet and a water inlet, and a water flow switch is arranged on the pipeline where the water outlet of the water heat exchange pipeline is located; the refrigerant heat exchange pipeline has a refrigerant outlet and a refrigerant inlet; the control device for the heat pump system comprises: an acquisition unit, which is configured to acquire the temperature of the refrigerant inlet of the refrigerant heat exchange pipeline when the heat pump system is turned on, recorded as the refrigerant inlet temperature of the refrigerant heat exchange pipeline; and acquire the refrigerant outlet of the refrigerant heat exchange pipeline. , recorded as the refrigerant outlet temperature of the refrigerant heat exchange pipeline; the control unit is configured to determine whether the water pump of the water system is not turned on, and determine whether the water flow switch is in a conducting state; the control unit is also configured to detect whether there is water in the water system according to the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline if it is determined that the water pump of the water system is not turned on and the water flow switch is in a conducting state, and obtain a detection result to realize the detection of the state of water or no water in the water system when the water pump of the water system is not turned on and the water flow switch is turned on; the control unit is also configured to control the operation process of the heat pump system according to the detection result, so as to realize the shutdown protection of the heat pump system when there is no water in the water system, and control the heat pump system to continue to operate when there is water in the water system.

[0011] In some embodiments, the control unit detects whether there is water in the water system according to the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and obtains a detection result, including: determining whether the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or determining whether the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is within a set temperature range; if it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or determining whether the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline. If the absolute value of the temperature difference between the refrigerant inlet temperature and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is within the set temperature range, it is determined that there is no water in the water system, and the detection result is that the water pump of the water system is not turned on, and there is no water in the water system; if it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is different from the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is not within the set temperature range, it is determined that there is water in the water system, and the detection result is that the water pump of the water system is not turned on, but there is water in the water system.

[0012] In some embodiments, the control unit controls the operation process of the heat pump system according to the detection result, including: when the detection result is that the water pump of the water system is not turned on and there is no water in the water system, controlling the heat pump system to shut down, initiating a reminder message of the heat pump system failure, and determining that the reason why the water flow switch is in the on state is that the water flow switch is short-circuited; when the detection result is that the water pump of the water system is not turned on, but there is water in the water system, controlling the heat pump system to continue running, and determining that the reason why the water pump of the water system is not turned on, but there is water in the water system is that other water pumps supply water to the water system.

[0013] In some embodiments, it also includes: the control unit is also configured to determine whether the continued operation time of the heat pump system reaches the set operation time when there is water in the water system and the heat pump system is controlled to continue to operate; the control unit is also configured to return if it is determined that the continued operation time of the heat pump system has reached the set operation time, so as to re-detect whether there is water in the water system based on the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline.

[0014] Matching the above device, the present invention provides a heat pump system on another aspect, including: the control device of the heat pump system described above.

[0015] In accordance with the above method, the present invention provides a storage medium on another aspect, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned control method for the heat pump system.

[0016] Therefore, the scheme of the present invention, by acquiring the temperature of the refrigerant inlet and outlet sides of the heat exchanger end when the heat pump system is not shut down and the water flow switch of the heat pump system is short-circuited, detects the state of water or no water in the heat pump system according to the temperature of the refrigerant inlet and outlet sides of the heat exchanger end, and then controls the operation of the heat pump system according to the state of water or no water in the heat pump system, and implements shutdown protection for the heat pump system when there is no water in the heat pump system. Thus, by detecting the state of water or no water in the heat pump system according to the temperature of the refrigerant inlet and outlet sides of the heat exchanger end when the heat pump system is not shut down and the water flow switch of the heat pump system is short-circuited, safety hazards such as heat exchanger pipe bursting and whole machine scrapping of the heat pump system caused by freezing, blockage and no water flow in the water channel of the heat pump system are avoided, which is beneficial to ensure the safety of the heat pump system.

[0017] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic flow chart of an embodiment of a method for controlling a heat pump system of the present invention;

[0020] Figure 2 It is a flow chart of an embodiment of a process of detecting whether there is water in a water system according to the refrigerant inlet and outlet temperatures of a water-side heat exchanger in a method of the present invention;

[0021] Figure 3 It is a flow chart of an embodiment of a process of cyclically detecting whether there is water in a water channel system when there is water in the water channel system in the method of the present invention;

[0022] Figure 4 It is a structural schematic diagram of an embodiment of a control device for a heat pump system of the present invention;

[0023] Figure 5 It is a structural schematic diagram of an embodiment of a heat pump system of the present invention;

[0024] Figure 6 It is a schematic diagram of a flow chart of detecting whether there is water in a heat pump system under the condition of a refrigerant cooling countercurrent and a heating forward flow in a control method for detecting whether there is water in a heat pump system according to the present invention;

[0025] Figure 7 It is a schematic diagram of the detection process of whether there is water in a heat pump system under the conditions of cooling forward flow and heating reverse flow of the refrigerant in the control method for detecting whether there is water in the heat pump system of the present invention.

[0026] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0027] 1- compressor; 2- first heat exchanger (such as heat exchanger A); 3- four-way valve; 4- electronic expansion valve; 5- first temperature sensor (such as temperature sensor A); 6- second temperature sensor (such as temperature sensor B); 7- second heat exchanger (such as heat exchanger B); 8- water flow switch; 9- control module; 102- acquisition unit; 104- control unit. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Considering that when there is no water flow in the heat pump system, the heat exchanger of the heat pump system cannot use water for heat exchange, so the heat exchanger will burst due to high-pressure pipelines; or, the water in the heat pump system freezes, which will also cause the heat exchanger to be unable to exchange heat, the heat pump system pressure is too high, resulting in pipeline bursts, and the entire machine is scrapped. Therefore, the scheme of the present invention proposes a control method for a heat pump system, specifically a control method for detecting whether there is water in the heat pump system, so that when the water flow switch is short-circuited or otherwise in the on state, the temperature of the refrigerant inlet and outlet pipes at the heat exchanger end can still detect whether there is water in the heat pump system, thereby avoiding the problem of affecting the normal operation of the unit and causing safety hazards due to the absence of water in the heat pump system. In some schemes, after the water flow switch of the water side system of the air-conditioning unit is in the disconnected state, the inlet water temperature and outlet water temperature of the water side system are obtained to determine whether to control the start of the fault protection of the water flow switch, thereby avoiding the problem of being unable to enter anti-freeze operation due to shutdown due to false protection of the water flow switch; however, this scheme cannot determine whether there is water in the heat pump system when the water flow switch is short-circuited. When the heat pump system is not shut down and the water flow switch of the heat pump system is short-circuited, the heat pump system cannot detect whether there is water in the heat pump system according to the water flow switch to perform shutdown protection. When the water circuit of the heat pump system is frozen, blocked, or there is no water flow, it will cause safety hazards such as bursting of the heat exchanger pipeline of the heat pump system and scrapping of the entire machine, seriously affecting the safety of the heat pump system.

[0030] According to an embodiment of the present invention, a control method for a heat pump system is provided. Figure 1 A flow chart of an embodiment of the method of the present invention is shown. The heat pump system has a water-side heat exchanger (i.e., a second heat exchanger 7). The water-side heat exchanger has a water heat exchange pipeline and a refrigerant heat exchange pipeline, the water heat exchange pipeline is arranged in the water system of the heat pump system, and the refrigerant heat exchange pipeline is arranged in the refrigerant system of the heat pump system. When the heat pump system operates normally, heat can be exchanged between the water heat exchange pipeline and the refrigerant heat exchange pipeline. The water heat exchange pipeline has a water outlet and a water inlet, and a water flow switch 8 is arranged on the pipeline where the water outlet of the water heat exchange pipeline is located. The refrigerant heat exchange pipeline has a refrigerant outlet and a refrigerant inlet. Specifically, Figure 5 FIG. 1 is a schematic diagram of the structure of an embodiment of a heat pump system of the present invention. Figure 5 As shown, the heat pump system in the scheme of the present invention includes: a compressor 1, a first heat exchanger (such as heat exchanger A) 2, a second heat exchanger (such as heat exchanger B) 7, a four-way valve 3, an electronic expansion valve 4, a first temperature sensor (such as temperature sensor A) 5, a second temperature sensor (such as temperature sensor B) 6, a water flow switch 8, and a control module 9. The exhaust port of the compressor 1 is connected to the first valve port of the four-way valve 3. The second valve port of the four-way valve 3 is connected to the first port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7. On the pipeline between the second valve port of the four-way valve 3 and the first port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7, near the first port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7, a second temperature sensor (such as temperature sensor B) 6 is provided. The second port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7 is connected to the second port of the first heat exchanger (such as heat exchanger A) 2 after passing through the electronic expansion valve 4. On the pipeline between the second port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7 and the electronic expansion valve 4, a first temperature sensor (such as temperature sensor A) 5 is provided near the second port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7. The water heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7 can exchange heat with the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7. The water heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7 has a water outlet pipeline and a water inlet pipeline. A water flow switch 8 is provided on the water outlet pipeline of the water heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7. The first port of the first heat exchanger (such as heat exchanger A) 2 is connected to the fourth valve port of the four-way valve 3. The third valve port of the four-way valve 3 is connected to the air intake port of the compressor 1. The control module 9 serves as a controller of the heat pump system.

[0031] Figure 5When the heat pump system shown is operating in cooling mode, the refrigerant is compressed by the compressor 1 and is compressed into a high-temperature and high-pressure gas. After passing through the four-way valve 3, it enters the second heat exchanger (such as heat exchanger B) 7. In the water-side heat exchanger (i.e., the second heat exchanger 7), water is used to exchange heat with the refrigerant, so that the high-temperature and high-pressure gaseous refrigerant becomes a normal-temperature and high-pressure liquid refrigerant after heat exchange. It is then throttled by the electronic expansion valve 4, passes through the first heat exchanger (such as heat exchanger A) 2 to absorb heat and evaporate into a gas. After passing through the four-way valve 3 again, it returns to the compressor 1 to complete a refrigeration cycle.

[0032] Figure 5 When the heat pump system shown is operating in the heating mode, the refrigerant is compressed by the compressor 1 and is compressed into a high-temperature and high-pressure gas. After passing through the four-way valve 3, it enters the first heat exchanger (such as heat exchanger A) 2, exchanges heat in the evaporator (i.e., the first heat exchanger 2), and is condensed into a liquid at normal temperature and high pressure. After that, it is throttled by the electronic expansion valve 4, and then passes through the second heat exchanger (such as heat exchanger B) 7 to absorb heat and evaporate into a gas. After passing through the four-way valve 3, it returns to the compressor 1 to complete a heating cycle.

[0033] In the water system of the heat pump system (i.e., the water heat exchange pipeline of the second heat exchanger 7), there is a water flow switch 8 on the water outlet waterway (i.e., the water outlet pipeline) of the second heat exchanger (such as heat exchanger B) 7. The on and off of the water flow switch 8 can determine whether there is water flow in the water system. However, in actual applications, the water flow in the water system may not necessarily meet the on and off value of the water flow switch 8. When the water flow in the water system is small, the water flow switch 8 is in a disconnected state, and the unit cannot be started and operated. When the water flow in the water system fluctuates, it will cause the water flow switch 8 to be frequently disconnected under certain circumstances, causing the unit to frequently report the water flow switch protection and cannot be continuously operated for a long time, seriously affecting the actual use effect of the user. When the installer is debugging the unit, or when the user is actually using the water system, the water flow in the water system is small, and the water flow switch 8 is usually short-circuited, so that the water flow switch 8 is always in a conducting state to shield the shutdown protection caused by the water flow switch 8 reporting protection. Although the unit can be operated continuously, the function of the water flow switch 8 is also invalid. When there is no water in the water system, it cannot be shut down and reported for protection in time. Therefore, the solution of the present invention can determine whether the water flow switch 8 is short-circuited. By installing temperature sensors (such as the first temperature sensor 5 and the second temperature sensor 6) at the refrigerant inlet and outlet of the heat exchanger (i.e., the second heat exchanger 7), it can be used to detect whether heat exchange is taking place on the refrigerant side of the heat exchanger, and to detect whether there is water in the water system.

[0034] In the scheme of the present invention, Figure 1 As shown, the control method of the heat pump system includes: steps S110 to S140.

[0035] In step S110, when the heat pump system is turned on, the temperature of the refrigerant inlet of the refrigerant heat exchange pipeline is obtained, which is recorded as the refrigerant inlet temperature of the refrigerant heat exchange pipeline. The temperature of the refrigerant outlet of the refrigerant heat exchange pipeline is also obtained, which is recorded as the refrigerant outlet temperature of the refrigerant heat exchange pipeline.

[0036] In step S120, when the heat pump system is turned on, it is determined whether the water pump of the water system is not turned on, and whether the water flow switch 8 is in the on state.

[0037] At step S130, when the heat pump system is turned on, if it is determined that the water pump of the water system is not turned on and the water flow switch 8 is in the on state, then when it is determined that the water pump of the water system is not turned on and the water flow switch 8 is turned on, based on the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline, detect whether there is water in the water system and obtain a detection result, so as to realize the detection of the presence or absence of water in the water system when the water pump of the water system is not turned on and the water flow switch 8 is turned on.

[0038] In some embodiments, in step S120, whether there is water in the water system is detected based on the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and the specific process of obtaining the detection result is shown in the following exemplary description.

[0039] Combine the following Figure 2 The method of the present invention is shown as a flow chart of an embodiment of the process of detecting whether there is water in the water system according to the refrigerant inlet and outlet temperatures of the water side heat exchanger, further illustrating the specific process of detecting whether there is water in the water system according to the refrigerant inlet and outlet temperatures of the water side heat exchanger in step S130, including: steps S210 to S230.

[0040] Step S210, determining whether the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or determining whether the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is within a set temperature range, wherein the set temperature range is, for example, 0.1°C to 0.9°C.

[0041] Step S220: If it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or if it is determined that the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is within the set temperature range, it is determined that there is no water in the water system. At this time, the detection result is that the water pump of the water system is not turned on and there is no water in the water system. The set temperature range can be flexibly adjusted according to specific circumstances.

[0042] Step S230, if it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is different from the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is not within the set temperature range, that is, the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline exceeds the set temperature range, such as the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is greater than the upper limit of the set temperature range, it is determined that there is water in the water system. At this time, the detection result is that the water pump of the water system is not turned on, but there is water in the water system.

[0043] In the scheme of the present invention, the presence or absence of water in the water system can be detected based on the inlet and outlet temperatures of the refrigerant side of the water side heat exchanger (i.e., the second heat exchanger 7) detected by the temperature sensor. Based on the detected presence or absence of water, the reason why the water flow switch 8 is turned on when the water pump in the unit is not turned on can be determined, and whether the water flow switch is short-circuited can be determined. Among them, the scheme of the present invention can determine the actual reason whether the water flow switch 8 is short-circuited: based on the temperature of the liquid pipe and the gas pipe on the refrigerant side of the water side heat exchanger (i.e., the second heat exchanger 7), if there is no temperature difference, there is no water in the water system. At this time, the water flow switch 8 is in the on state and the water pump in the water system is not turned on, which means that the water flow switch 8 is short-circuited.

[0044] At step S140, the operation process of the heat pump system is controlled according to the detection result to achieve shutdown protection of the heat pump system when there is no water in the water system, and to control the heat pump system to continue operating when there is water in the water system.

[0045] The solution of the present invention proposes a control method for detecting whether there is water in a heat pump system. Figure 5When the heat pump system shown in the figure performs water or no water detection, it first detects whether the water flow switch is in the on state. When the water flow switch is on, but the water pump in the heat pump system is not turned on and the water flow switch cannot be started for fault protection. Here, detecting whether the water flow switch is in the on state can be: the controller can receive the feedback signal of the water flow switch, and can judge whether the water flow switch is in the on state through the control module. At this time, the heat pump system can be judged whether there is water or not according to the inlet and outlet temperatures of the refrigerant of the heat exchanger. When there is no water in the heat pump system, an alarm is issued in time and the unit is shut down. When it is detected that there is water in the heat pump system, it means that there is an additional water pump supplying water, and the unit can operate normally. In this way, when the water flow switch 8 is short-circuited or other reasons are always in the on state, the refrigerant inlet and outlet pipe temperatures at the heat exchanger (i.e., the water side heat exchanger) end can still detect whether there is water or not in the heat pump system, avoiding the problem of affecting the normal operation of the unit and causing safety hazards due to the absence of water in the heat pump system. Furthermore, when the water flow switch 8 is short-circuited, it is still possible to detect whether there is water in the heat pump system, thereby making the unit safer and facilitating more stable operation of the unit.

[0046] In some embodiments, in step S140, the operation process of the heat pump system is controlled according to the detection result, including any of the following control situations of controlling the heat pump system according to the detection result:

[0047] The first is a control situation of controlling the heat pump system according to the detection result: when the detection result is that the water pump of the water system is not turned on and there is no water in the water system, the heat pump system is controlled to shut down, and a reminder message of the heat pump system failure is initiated, and it is determined that the reason why the water flow switch 8 is in the on state is that the water flow switch 8 is short-circuited.

[0048] The second control situation of the heat pump system according to the detection result: when the detection result is that the water pump of the water system is not turned on, but there is water in the water system, the heat pump system is controlled to continue to operate, and it is determined that the reason why the water pump of the water system is not turned on but there is water in the water system is that other water pumps supply water to the water system.

[0049] Specifically, Figure 6 The present invention is a flow chart of detecting whether there is water in a heat pump system under the condition of refrigerant cooling countercurrent and heating forward flow in the control method for detecting whether there is water in a heat pump system. Figure 7 The present invention is a schematic diagram of the detection process of whether there is water in the heat pump system under the condition of the refrigerant cooling forward flow and heating reverse flow in the control method for detecting whether there is water in the heat pump system. Wherein, forward flow means that the water flow direction of the water system is the same as the refrigerant flow direction of the refrigerant system. Reverse flow means that the water flow direction of the water system is opposite to the refrigerant flow direction of the refrigerant system. Figure 6 and Figure 7As shown, the solution of the present invention provides a control method for detecting whether there is water in a heat pump system, comprising:

[0050] Step 1, the unit is powered on and started to run. At this time, the water pump in the water system of the unit is not turned on yet, and it is detected that the water flow switch 8 is in the on state. There are two main reasons why the water flow switch 8 is in the on state. One is that the water flow switch 8 is short-circuited, and the other is that there is an additional water pump supplying water. Of course, it may also be that the water flow switch itself is faulty. For example, the target piece is always in the connected on state. In this case, when the unit is shut down, it can be judged whether it is a fault of the water flow switch itself. The solution of the present invention only judges whether it is short-circuited or there is an additional water pump supplying water. At this time, the water flow switch 8 cannot accurately detect whether there is water in the water system, so it is necessary to judge whether there is water in the water system by whether the refrigerant side of the water side heat exchanger (i.e., the second heat exchanger 7) has performed heat exchange, and judge the reason why the water flow switch 8 is turned on.

[0051] Step 2: According to the operation mode of the unit, combined with the inlet and outlet temperatures of the refrigerant side of the water side heat exchanger (i.e., the second heat exchanger 7), the water or no water status of the water system in the heat pump system is detected, see steps 21 and 22 for details.

[0052] Step 21: When the unit is in cooling mode and running:

[0053] The water flow direction of the water-side heat exchanger (i.e., the second heat exchanger 7) is bottom-in and top-out. Taking the refrigerant flow direction as countercurrent as an example, the temperature detected by the first temperature sensor (such as temperature sensor A) 5 on the refrigerant-side liquid pipe of the second heat exchanger (such as heat exchanger B) 7 is the first temperature sensor detection temperature T1, and the temperature detected by the second temperature sensor (such as temperature sensor B) 6 on the refrigerant-side gas pipe of the second heat exchanger (such as heat exchanger B) 7 is the second temperature sensor detection temperature T2. When the first temperature sensor detection temperature T1 is less than the second temperature sensor detection temperature T2, it means that there is heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, then there is water in the water system of the second heat exchanger (such as heat exchanger B) 7, and there is an additional water pump to supply water, and the unit can operate normally. When the temperature T1 detected by the first temperature sensor is equal to the temperature T2 detected by the second temperature sensor, it means that there is no heat exchange on the refrigerant side, and there is no water in the water system of the second heat exchanger (such as heat exchanger B) 7, and the unit is shut down for protection. The reason why the water flow switch 8 is turned on is that the water flow switch is short-circuited. If the refrigerant flows in the downstream direction, then the temperature T2 detected by the second temperature sensor is less than the temperature T1 detected by the first temperature sensor, which means that there is heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is water in the water system of the second heat exchanger (such as heat exchanger B) 7. When the temperature T1 detected by the first temperature sensor is equal to the temperature T2 detected by the second temperature sensor, it means that there is no heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is no water in the water system of the second heat exchanger (such as heat exchanger B) 7, and the unit is shut down for protection.

[0054] Step 22: When the unit is in heating mode and running:

[0055] The water flow direction of the water-side heat exchanger (i.e., the second heat exchanger 7) is from bottom to top. Taking the refrigerant flow direction as an example, the temperature detected by the first temperature sensor (such as temperature sensor A) 5 on the refrigerant-side liquid pipe of the second heat exchanger (such as heat exchanger B) 7 is the first temperature sensor detection temperature T1, and the temperature detected by the second temperature sensor (such as temperature sensor B) 6 on the refrigerant-side gas pipe of the second heat exchanger (such as heat exchanger B) 7 is the second temperature sensor detection temperature T2. When the second temperature sensor detection temperature T2 is less than the first temperature sensor detection temperature T1, it means that there is heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is water in the water system of the second heat exchanger (such as heat exchanger B) 7, and there is an additional water pump to supply water, and the unit can operate normally. When the temperature T1 detected by the first temperature sensor is equal to the temperature T2 detected by the second temperature sensor, it means that there is no heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is no water in the water system of the second heat exchanger (such as heat exchanger B) 7, and the unit is shut down for protection. The reason why the water flow switch 8 is turned on is that the water flow switch is short-circuited. If the refrigerant flow direction is countercurrent, then when the temperature T1 detected by the first temperature sensor is less than the temperature T2 detected by the second temperature sensor, it means that there is heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is water in the water system of the second heat exchanger (such as heat exchanger B) 7. When the temperature T1 detected by the first temperature sensor is equal to the temperature T2 detected by the second temperature sensor, it means that there is no heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is no water in the water system of the second heat exchanger (such as heat exchanger B) 7, and the unit is shut down for protection.

[0056] In some embodiments, the control method of the heat pump system described in the solution of the present invention also includes: a process of cyclically detecting whether there is water in the water system when there is water in the water system.

[0057] Combine the following Figure 3 The method of the present invention is shown as a flow chart of an embodiment of the process of cyclically detecting whether there is water in the water system when there is water in the water system, further illustrating the specific process of cyclically detecting whether there is water in the water system when there is water in the water system, including: step S310 to step S320.

[0058] Step S310, when there is water in the water system and the heat pump system is controlled to continue to operate, it is determined whether the heat pump system continues to operate for a set operating time.

[0059] Step S320, if it is determined that the heat pump system continues to run for the set running time, then return to re-detect whether there is water in the water system according to the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and obtain a new detection result to detect whether there is water in the water system when the water flow switch 8 is turned on. Then, according to the new detection result, the operation process of the heat pump system is controlled to realize the shutdown protection of the heat pump system when there is no water in the water system, and control the heat pump system to continue running when there is water in the water system, so as to realize the circulation detection of whether there is water in the water system, and avoid the safety hazards such as excessive pressure in the heat exchanger pipeline of the heat pump system after other water pumps stop supplying water to the water system. Of course, if it is determined that the time for which the heat pump system continues to run has not reached the set running time, the heat pump system is controlled to continue running, and returns to the situation where there is water in the water system and the heat pump system is controlled to continue running, and then it is continued to determine whether the time for which the heat pump system continues to run has reached the set running time, thereby realizing a circulation detection of whether there is water in the water system.

[0060] Specifically, see Figure 5 In the example shown, there is a control module 9 on the water-side heat exchanger (i.e., the second heat exchanger 7), which can determine whether the unit needs to be shut down for protection based on the first temperature sensor detection temperature T1 detected by the first temperature sensor (such as temperature sensor A) and the second temperature sensor detection temperature T2 detected by the second temperature sensor (such as temperature sensor B). When it is detected that there is water in the water system of the second heat exchanger (such as heat exchanger B) 7, it is necessary to run for a period of time and then detect whether there is water in the water system of the second heat exchanger (such as heat exchanger B) 7 again to avoid the water system of the second heat exchanger (such as heat exchanger B) 7 being dry when the additional water pump stops working, affecting the stable operation of the unit. Among them, the period of further operation needs to be calculated based on the heat exchange, and the heat exchange is related to the refrigerant, the inlet and outlet water temperatures and the heat exchange area.

[0061] Thus, in the scheme of the present invention, the presence or absence of water in the heat pump system is judged according to the refrigerant inlet and outlet temperatures of the heat exchanger (such as the second heat exchanger 7), which solves the problem that the water flow switch 8 is in the on state and fails due to other reasons (such as a water flow switch failure), and the presence or absence of water cannot be detected. The judgment condition of the presence or absence of water in the heat pump system is judged according to the refrigerant inlet and outlet temperatures of the heat exchanger (such as the second heat exchanger 7). When the heat pump system is detected to be without water, an alarm is promptly issued and the system is shut down to avoid excessive pressure in the heat exchanger pipeline, which affects the stable operation of the unit, and solves the problem that when the water flow switch 8 is turned on, but there is no water in the heat pump system, the fault cannot be reported in time and the system cannot be shut down.

[0062] Some solutions detect the change of the heat pump outlet water temperature when the heat pump system is running in the cooling mode, and monitor the state of the low pressure value at the same time, reduce the misjudgment of water flow loss due to the error of the outlet water temperature, reduce the start and stop of the unit, reduce the risk of freezing of the heat exchanger caused by the failure of the water flow switch, and determine whether there is water flow, but only in the cooling mode. The solution of the present invention can detect whether there is water in the heat pump system when the heat pump system is running in the cooling and heating modes.

[0063] There are also some solutions that, after the water flow switch of the water side system of the air conditioner unit is in the disconnected state, by obtaining the water inlet temperature and water outlet temperature of the water side system, determine whether to control the activation of the fault protection of the water flow switch, thereby avoiding the problem of being unable to enter the antifreeze operation due to shutdown caused by the water flow switch misprotection, but cannot detect whether there is water in the heat pump system. The solution of the present invention is that when the water flow switch fails, it can still detect whether there is water in the heat pump system, so that the unit operation is more stable.

[0064] There are also some solutions that change the inlet and outlet water temperature difference protection accordingly according to the outdoor ambient temperature to ensure that the unit does not trigger the protection at will, but it needs to rely on the outdoor ambient temperature. The solution of the present invention is not affected by the outdoor ambient temperature and can detect whether there is water in the heat pump system to ensure stable operation of the unit.

[0065] The scheme of the present invention detects the state of water or no water in the heat pump system by using the temperature detected by the temperature sensor on the refrigerant inlet and outlet sides of the heat exchanger end. When the water pump in the heat pump system is not turned on but the water flow switch is still in the on state, the reason causing the water flow switch to be turned on is determined, so that the unit can operate more stably and reliably.

[0066] By adopting the technical solution of the present embodiment, the temperature of the refrigerant inlet and outlet sides of the heat exchanger end is obtained when the heat pump system is not shut down and the water flow switch of the heat pump system is short-circuited, and the state of whether there is water in the heat pump system is detected according to the temperature of the refrigerant inlet and outlet sides of the heat exchanger end. Then, the operation of the heat pump system is controlled according to the state of whether there is water in the heat pump system, and shutdown protection of the heat pump system is implemented when there is no water in the heat pump system. Therefore, by detecting the state of whether there is water in the heat pump system according to the temperature of the refrigerant inlet and outlet sides of the heat exchanger end when the heat pump system is not shut down and the water flow switch of the heat pump system is short-circuited, safety hazards such as bursting of the heat exchanger pipeline of the heat pump system and scrapping of the whole machine caused by freezing, blockage and lack of water flow in the water channel of the heat pump system are avoided, which is beneficial to ensuring the safety of the heat pump system.

[0067] According to an embodiment of the present invention, a control device for a heat pump system corresponding to the control method for the heat pump system is also provided. Figure 4The schematic diagram of the structure of an embodiment of the device of the present invention is shown. The heat pump system has a water-side heat exchanger (i.e., the second heat exchanger 7). The water-side heat exchanger has a water heat exchange pipeline and a refrigerant heat exchange pipeline, the water heat exchange pipeline is arranged in the water system of the heat pump system, and the refrigerant heat exchange pipeline is arranged in the refrigerant system of the heat pump system. When the heat pump system operates normally, heat can be exchanged between the water heat exchange pipeline and the refrigerant heat exchange pipeline. The water heat exchange pipeline has a water outlet and a water inlet, and a water flow switch 8 is arranged on the pipeline where the water outlet of the water heat exchange pipeline is located. The refrigerant heat exchange pipeline has a refrigerant outlet and a refrigerant inlet. Specifically, Figure 5 FIG. 1 is a schematic diagram of the structure of an embodiment of a heat pump system of the present invention. Figure 5 As shown, the heat pump system in the scheme of the present invention includes: a compressor 1, a first heat exchanger (such as heat exchanger A) 2, a second heat exchanger (such as heat exchanger B) 7, a four-way valve 3, an electronic expansion valve 4, a first temperature sensor (such as temperature sensor A) 5, a second temperature sensor (such as temperature sensor B) 6, a water flow switch 8, and a control module 9. The exhaust port of the compressor 1 is connected to the first valve port of the four-way valve 3. The second valve port of the four-way valve 3 is connected to the first port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7. On the pipeline between the second valve port of the four-way valve 3 and the first port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7, near the first port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7, a second temperature sensor (such as temperature sensor B) 6 is provided. The second port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7 is connected to the second port of the first heat exchanger (such as heat exchanger A) 2 after passing through the electronic expansion valve 4. On the pipeline between the second port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7 and the electronic expansion valve 4, a first temperature sensor (such as temperature sensor A) 5 is provided near the second port of the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7. The water heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7 can exchange heat with the refrigerant heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7. The water heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7 has a water outlet pipeline and a water inlet pipeline. A water flow switch 8 is provided on the water outlet pipeline of the water heat exchange pipeline of the second heat exchanger (such as heat exchanger B) 7. The first port of the first heat exchanger (such as heat exchanger A) 2 is connected to the fourth valve port of the four-way valve 3. The third valve port of the four-way valve 3 is connected to the air intake port of the compressor 1. The control module 9 serves as a controller of the heat pump system.

[0068] Figure 5When the heat pump system shown is operating in cooling mode, the refrigerant is compressed by the compressor 1 and is compressed into a high-temperature and high-pressure gas. After passing through the four-way valve 3, it enters the second heat exchanger (such as heat exchanger B) 7. In the water-side heat exchanger (i.e., the second heat exchanger 7), water is used to exchange heat with the refrigerant, so that the high-temperature and high-pressure gaseous refrigerant becomes a normal-temperature and high-pressure liquid refrigerant after heat exchange. It is then throttled by the electronic expansion valve 4, passes through the first heat exchanger (such as heat exchanger A) 2 to absorb heat and evaporate into a gas. After passing through the four-way valve 3 again, it returns to the compressor 1 to complete a refrigeration cycle.

[0069] Figure 5 When the heat pump system shown is operating in the heating mode, the refrigerant is compressed by the compressor 1 and is compressed into a high-temperature and high-pressure gas. After passing through the four-way valve 3, it enters the first heat exchanger (such as heat exchanger A) 2, exchanges heat in the evaporator (i.e., the first heat exchanger 2), and is condensed into a liquid at normal temperature and high pressure. After that, it is throttled by the electronic expansion valve 4, and then passes through the second heat exchanger (such as heat exchanger B) 7 to absorb heat and evaporate into a gas. After passing through the four-way valve 3, it returns to the compressor 1 to complete a heating cycle.

[0070] In the water system of the heat pump system (i.e., the water heat exchange pipeline of the second heat exchanger 7), there is a water flow switch 8 on the water outlet waterway (i.e., the water outlet pipeline) of the second heat exchanger (such as heat exchanger B) 7. The on and off of the water flow switch 8 can determine whether there is water flow in the water system. However, in actual applications, the water flow in the water system may not necessarily meet the on and off value of the water flow switch 8. When the water flow in the water system is small, the water flow switch 8 is in a disconnected state, and the unit cannot be started and operated. When the water flow in the water system fluctuates, it will cause the water flow switch 8 to be frequently disconnected under certain circumstances, causing the unit to frequently report the water flow switch protection and cannot be continuously operated for a long time, seriously affecting the actual use effect of the user. When the installer is debugging the unit, or when the user is actually using the water system, the water flow in the water system is small, and the water flow switch 8 is usually short-circuited, so that the water flow switch 8 is always in a conducting state to shield the shutdown protection caused by the water flow switch 8 reporting protection. Although the unit can be operated continuously, the function of the water flow switch 8 is also invalid. When there is no water in the water system, it cannot be shut down and reported for protection in time. Therefore, the solution of the present invention can determine whether the water flow switch 8 is short-circuited. By installing temperature sensors (such as the first temperature sensor 5 and the second temperature sensor 6) at the refrigerant inlet and outlet of the heat exchanger (i.e., the second heat exchanger 7), it can be used to detect whether heat exchange is taking place on the refrigerant side of the heat exchanger, and to detect whether there is water in the water system.

[0071] In the scheme of the present invention, Figure 1 As shown, the control device of the heat pump system includes: an acquisition unit 102 and a control unit 104.

[0072] The acquisition unit 102 is configured to acquire the temperature of the refrigerant inlet of the refrigerant heat exchange pipeline when the heat pump system is turned on, and record it as the refrigerant inlet temperature of the refrigerant heat exchange pipeline. And acquire the temperature of the refrigerant outlet of the refrigerant heat exchange pipeline, and record it as the refrigerant outlet temperature of the refrigerant heat exchange pipeline. The specific functions and processing of the acquisition unit 102 refer to step S110.

[0073] The control unit 104 is configured to determine whether the water pump of the water system is not turned on and whether the water flow switch 8 is in the on state when the heat pump system is turned on. The specific functions and processing of the control unit 104 refer to step S120.

[0074] The control unit 104 is also configured to detect whether there is water in the water system according to the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline when the water pump system is turned on and the water flow switch 8 is turned on, and obtain a detection result, so as to detect whether there is water in the water system when the water pump of the water system is not turned on and the water flow switch 8 is turned on. The specific functions and processing of the control unit 104 are also shown in step S130.

[0075] In some embodiments, the control unit 104 detects whether there is water in the water system according to the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and obtains the detection result, including:

[0076] The control unit 104 is further configured to determine whether the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or determine whether the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is within a set temperature range. The set temperature range is, for example, 0.1°C to 0.9°C. The specific functions and processing of the control unit 104 are also referred to step S210.

[0077] The control unit 104 is further configured to determine that there is no water in the water system if it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or if it is determined that the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is within the set temperature range. At this time, the detection result is that the water pump of the water system is not turned on and there is no water in the water system. The specific functions and processing of the control unit 104 are also shown in step S220.

[0078] The control unit 104 is also specifically configured to determine that there is water in the water system if it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is different from the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is not within the set temperature range, that is, the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline exceeds the set temperature range, such as the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is greater than the upper limit of the set temperature range, then the detection result is that the water pump of the water system is not turned on, but there is water in the water system. The specific functions and processing of the control unit 104 can also be found in step S230.

[0079] In the scheme of the present invention, the presence or absence of water in the water system can be detected based on the inlet and outlet temperatures of the refrigerant side of the water side heat exchanger (i.e., the second heat exchanger 7) detected by the temperature sensor. Based on the detected presence or absence of water, the reason why the water flow switch 8 is turned on when the water pump in the unit is not turned on can be determined, and whether the water flow switch is short-circuited can be determined. Among them, the scheme of the present invention can determine the actual reason whether the water flow switch 8 is short-circuited: based on the temperature of the liquid pipe and the gas pipe on the refrigerant side of the water side heat exchanger (i.e., the second heat exchanger 7), if there is no temperature difference, there is no water in the water system. At this time, the water flow switch 8 is in the on state and the water pump in the water system is not turned on, which means that the water flow switch 8 is short-circuited.

[0080] The control unit 104 is further configured to control the operation process of the heat pump system according to the detection result, so as to realize shutdown protection of the heat pump system when there is no water in the water system, and control the heat pump system to continue to operate when there is water in the water system. The specific functions and processing of the control unit 104 are also shown in step S140.

[0081] The solution of the present invention proposes a control device for detecting whether there is water in a heat pump system. Figure 5When the heat pump system shown in the figure detects whether there is water or not, it first detects whether the water flow switch is in the on state. When the water flow switch is on, but the water pump in the heat pump system is not turned on and the water flow switch cannot be started for fault protection. At this time, the heat pump system can be judged whether there is water or not according to the inlet and outlet temperatures of the refrigerant of the heat exchanger. When there is no water in the heat pump system, an alarm is issued in time and the unit is shut down. When it is detected that there is water in the heat pump system, it means that there is an additional water pump supplying water, and the unit can operate normally. In this way, when the water flow switch 8 is short-circuited or otherwise in the on state, the refrigerant inlet and outlet pipe temperature at the heat exchanger (i.e., the water side heat exchanger) end can still detect whether there is water or not in the heat pump system, thereby avoiding the problem that the normal operation of the unit is affected by the absence of water in the heat pump system and causing safety hazards. Moreover, when the water flow switch 8 is short-circuited, it can still detect whether there is water or not in the heat pump system, making the unit safer and helping to ensure more stable operation of the unit.

[0082] In some embodiments, the control unit 104 controls the operation process of the heat pump system according to the detection result, including any of the following control situations of controlling the heat pump system according to the detection result:

[0083] The first is a control situation of controlling the heat pump system according to the detection result: the control unit 104 is further configured to control the heat pump system to shut down when the detection result is that the water pump of the water system is not turned on and there is no water in the water system, initiate a reminder message of the heat pump system failure, and determine that the reason why the water flow switch 8 is in the on state is that the water flow switch 8 is short-circuited.

[0084] The second control situation of controlling the heat pump system according to the detection result: the control unit 104 is specifically configured to control the heat pump system to continue operating when the detection result is that the water pump of the water system is not turned on but there is water in the water system, and determine that the reason why the water pump of the water system is not turned on but there is water in the water system is that other water pumps supply water to the water system.

[0085] Specifically, Figure 6 The present invention is a schematic diagram of a flow chart of detecting whether there is water in a heat pump system under the condition of a refrigerant cooling countercurrent and heating forward flow in a control device for detecting whether there is water in a heat pump system. Figure 7 The present invention is a schematic diagram of the detection process of whether there is water in the heat pump system under the condition of the refrigerant cooling forward flow and heating reverse flow in the control device for detecting whether there is water in the heat pump system. Wherein, forward flow means that the water flow direction of the water system is the same as the refrigerant flow direction of the refrigerant system. Reverse flow means that the water flow direction of the water system is opposite to the refrigerant flow direction of the refrigerant system. Figure 6 and Figure 7 As shown, the solution of the present invention provides a control device for detecting whether there is water in a heat pump system, comprising:

[0086] Step 1, the unit is powered on and started. At this time, the water pump in the water system of the unit is not turned on, and the water flow switch 8 is detected to be in the on state. There are two reasons why the water flow switch 8 is in the on state. One is that the water flow switch 8 is short-circuited, and the other is that there is an additional water pump supplying water. At this time, the water flow switch 8 cannot accurately detect whether there is water in the water system, so it is necessary to determine whether there is water in the water system by whether the refrigerant side of the water side heat exchanger (i.e., the second heat exchanger 7) has exchanged heat to determine whether there is water in the water system and the reason why the water flow switch 8 is turned on.

[0087] Step 2: According to the operation mode of the unit, combined with the inlet and outlet temperatures of the refrigerant side of the water side heat exchanger (i.e., the second heat exchanger 7), the water or no water status of the water system in the heat pump system is detected, see steps 21 and 22 for details.

[0088] Step 21: When the unit is in cooling mode and running:

[0089] The water flow direction of the water-side heat exchanger (i.e., the second heat exchanger 7) is bottom-in and top-out. Taking the refrigerant flow direction as countercurrent as an example, the temperature detected by the first temperature sensor (such as temperature sensor A) 5 on the refrigerant-side liquid pipe of the second heat exchanger (such as heat exchanger B) 7 is the first temperature sensor detection temperature T1, and the temperature detected by the second temperature sensor (such as temperature sensor B) 6 on the refrigerant-side gas pipe of the second heat exchanger (such as heat exchanger B) 7 is the second temperature sensor detection temperature T2. When the first temperature sensor detection temperature T1 is less than the second temperature sensor detection temperature T2, it means that there is heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, then there is water in the water system of the second heat exchanger (such as heat exchanger B) 7, and there is an additional water pump to supply water, and the unit can operate normally. When the temperature T1 detected by the first temperature sensor is equal to the temperature T2 detected by the second temperature sensor, it means that there is no heat exchange on the refrigerant side, and there is no water in the water system of the second heat exchanger (such as heat exchanger B) 7, and the unit is shut down for protection. The reason why the water flow switch 8 is turned on is that the water flow switch is short-circuited. If the refrigerant flows in the downstream direction, then the temperature T2 detected by the second temperature sensor is less than the temperature T1 detected by the first temperature sensor, which means that there is heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is water in the water system of the second heat exchanger (such as heat exchanger B) 7. When the temperature T1 detected by the first temperature sensor is equal to the temperature T2 detected by the second temperature sensor, it means that there is no heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is no water in the water system of the second heat exchanger (such as heat exchanger B) 7, and the unit is shut down for protection.

[0090] Step 22: When the unit is in heating mode and running:

[0091] The water flow direction of the water-side heat exchanger (i.e., the second heat exchanger 7) is from bottom to top. Taking the refrigerant flow direction as an example, the temperature detected by the first temperature sensor (such as temperature sensor A) 5 on the refrigerant-side liquid pipe of the second heat exchanger (such as heat exchanger B) 7 is the first temperature sensor detection temperature T1, and the temperature detected by the second temperature sensor (such as temperature sensor B) 6 on the refrigerant-side gas pipe of the second heat exchanger (such as heat exchanger B) 7 is the second temperature sensor detection temperature T2. When the second temperature sensor detection temperature T2 is less than the first temperature sensor detection temperature T1, it means that there is heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is water in the water system of the second heat exchanger (such as heat exchanger B) 7, and there is an additional water pump to supply water, and the unit can operate normally. When the temperature T1 detected by the first temperature sensor is equal to the temperature T2 detected by the second temperature sensor, it means that there is no heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is no water in the water system of the second heat exchanger (such as heat exchanger B) 7, and the unit is shut down for protection. The reason why the water flow switch 8 is turned on is that the water flow switch is short-circuited. If the refrigerant flow direction is countercurrent, then when the temperature T1 detected by the first temperature sensor is less than the temperature T2 detected by the second temperature sensor, it means that there is heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is water in the water system of the second heat exchanger (such as heat exchanger B) 7. When the temperature T1 detected by the first temperature sensor is equal to the temperature T2 detected by the second temperature sensor, it means that there is no heat exchange on the refrigerant side of the second heat exchanger (such as heat exchanger B) 7, and there is no water in the water system of the second heat exchanger (such as heat exchanger B) 7, and the unit is shut down for protection.

[0092] In some embodiments, the control device of the heat pump system described in the solution of the present invention further includes: a process of cyclically detecting whether there is water in the water system when there is water in the water system, specifically as follows:

[0093] The control unit 104 is further configured to determine whether the heat pump system continues to operate for a set operating time when there is water in the water system and the heat pump system is controlled to continue to operate. The specific functions and processing of the control unit 104 are also shown in step S310.

[0094] The control unit 104 is also configured to return to detect whether there is water in the water system according to the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline if it is determined that the heat pump system continues to operate for the set operating time, and obtain a new detection result to detect whether there is water in the water system when the water flow switch 8 is turned on. Furthermore, according to the new detection result, the operation process of the heat pump system is controlled to realize the shutdown protection of the heat pump system when there is no water in the water system, and to control the heat pump system to continue to operate when there is water in the water system, so as to realize the circulation detection of whether there is water in the water system, so as to avoid safety hazards such as excessive pressure in the heat exchanger pipeline of the heat pump system after other water pumps stop supplying water to the water system. Of course, if it is determined that the heat pump system continues to operate for a time that does not reach the set operating time, the heat pump system is controlled to continue to operate, and the process returns to the state where there is water in the water system and the heat pump system is controlled to continue to operate, and the process continues to determine whether the heat pump system continues to operate for a time that reaches the set operating time, thereby realizing a cycle detection of whether there is water in the water system. The specific functions and processing of the control unit 104 are also referred to step S320.

[0095] Specifically, see Figure 5 In the example shown, a control module 9 is provided on the water-side heat exchanger (i.e., the second heat exchanger 7), which can determine whether the unit needs to be shut down for protection based on the first temperature sensor detection temperature T1 detected by the first temperature sensor (e.g., temperature sensor A) and the second temperature sensor detection temperature T2 detected by the second temperature sensor (e.g., temperature sensor B). When it is detected that there is water in the water system of the second heat exchanger (e.g., heat exchanger B) 7, it is necessary to run for a period of time and then detect again whether there is water in the water system of the second heat exchanger (e.g., heat exchanger B) 7 to avoid the water system of the second heat exchanger (e.g., heat exchanger B) 7 being dry when the additional water pump stops working, which affects the stable operation of the unit.

[0096] Thus, in the scheme of the present invention, the presence or absence of water in the heat pump system is judged according to the refrigerant inlet and outlet temperatures of the heat exchanger (such as the second heat exchanger 7), which solves the problem that the water flow switch 8 is in a conducting state and fails due to other reasons (such as a water flow switch failure), and the presence or absence of water cannot be detected. The judgment condition of the presence or absence of water in the heat pump system is judged according to the refrigerant inlet and outlet temperatures of the heat exchanger (such as the second heat exchanger 7). When the heat pump system is detected to be without water, an alarm is promptly issued and the system is shut down to avoid excessive pressure in the heat exchanger pipeline, which affects the stable operation of the unit, and solves the problem that when the water flow switch 8 is turned on, there is no water in the heat pump system, and the failure to report the fault and shut down in time is not possible. When the water flow switch 8 is turned on, the result of the water or no water detection can be used to judge whether the water flow switch 8 is short-circuited, which solves the problem that when the water pump is not turned on in the heat pump system, the water flow switch is turned on, and the reason for the water flow switch being turned on cannot be determined.

[0097] Some solutions detect the change of the heat pump outlet water temperature when the heat pump system is running in the cooling mode, and monitor the state of the low pressure value at the same time, reduce the misjudgment of water flow loss due to the error of the outlet water temperature, reduce the start and stop of the unit, reduce the risk of freezing of the heat exchanger caused by the failure of the water flow switch, and determine whether there is water flow, but only in the cooling mode. The solution of the present invention can detect whether there is water in the heat pump system when the heat pump system is running in the cooling and heating modes.

[0098] There are also some solutions that, after the water flow switch of the water side system of the air conditioner unit is in the disconnected state, by obtaining the water inlet temperature and water outlet temperature of the water side system, determine whether to control the activation of the fault protection of the water flow switch, thereby avoiding the problem of being unable to enter the antifreeze operation due to shutdown caused by the water flow switch misprotection, but cannot detect whether there is water in the heat pump system. The solution of the present invention is that when the water flow switch fails, it can still detect whether there is water in the heat pump system, so that the unit operation is more stable.

[0099] There are also some solutions that change the inlet and outlet water temperature difference protection accordingly according to the outdoor ambient temperature to ensure that the unit does not trigger the protection at will, but it needs to rely on the outdoor ambient temperature. The solution of the present invention is not affected by the outdoor ambient temperature and can detect whether there is water in the heat pump system to ensure stable operation of the unit.

[0100] The scheme of the present invention detects the state of water or no water in the heat pump system by using the temperature detected by the temperature sensor on the refrigerant inlet and outlet sides of the heat exchanger end. When the water pump in the heat pump system is not turned on but the water flow switch is still in the on state, the reason causing the water flow switch to be turned on is determined, so that the unit can operate more stably and reliably.

[0101] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0102] By adopting the technical solution of the present invention, the temperatures of the refrigerant inlet and outlet sides of the heat exchanger end are obtained when the heat pump system is not shut down and the water flow switch of the heat pump system is short-circuited. The presence or absence of water in the heat pump system is detected according to the temperatures of the refrigerant inlet and outlet sides of the heat exchanger end. Then, the operation of the heat pump system is controlled according to the presence or absence of water in the heat pump system. When there is no water in the heat pump system, shutdown protection of the heat pump system is implemented, so that the safety and operation stability of the heat pump system are further improved, and the user experience is better.

[0103] According to an embodiment of the present invention, a heat pump system corresponding to the control device of the heat pump system is also provided. The heat pump system may include: the control device of the heat pump system described above.

[0104] Since the processing and functions implemented by the heat pump system of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0105] By adopting the technical solution of the present invention, the temperatures of the refrigerant inlet and outlet sides of the heat exchanger end are obtained when the heat pump system is not shut down and the water flow switch of the heat pump system is short-circuited. The state of water or no water in the heat pump system is detected according to the temperatures of the refrigerant inlet and outlet sides of the heat exchanger end. Then, the operation of the heat pump system is controlled according to the state of water or no water in the heat pump system. When there is no water in the heat pump system, shutdown protection of the heat pump system is implemented, making the heat pump system safer and operating more stably.

[0106] According to an embodiment of the present invention, a storage medium corresponding to the control method of the heat pump system is also provided, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the control method of the heat pump system described above.

[0107] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0108] By adopting the technical solution of the present invention, the temperatures of the refrigerant inlet and outlet sides of the heat exchanger end are obtained when the heat pump system is not shut down and the water flow switch of the heat pump system is short-circuited. The presence or absence of water in the heat pump system is detected according to the temperatures of the refrigerant inlet and outlet sides of the heat exchanger end. Then, the operation of the heat pump system is controlled according to the presence or absence of water in the heat pump system. When there is no water in the heat pump system, shutdown protection of the heat pump system is implemented, thereby avoiding the problem of normal operation of the unit being affected by the absence of water in the heat pump system and causing safety hazards, thereby improving the reliability and safety of the heat pump system.

[0109] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0110] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A control method for a heat pump system, characterized in that: The heat pump system comprises a water-side heat exchanger; the water-side heat exchanger comprises a water heat exchange pipeline and a refrigerant heat exchange pipeline, the water heat exchange pipeline is arranged in the water system of the heat pump system, and the refrigerant heat exchange pipeline is arranged in the refrigerant system of the heat pump system; when the heat pump system operates normally, heat can be exchanged between the water heat exchange pipeline and the refrigerant heat exchange pipeline; the water heat exchange pipeline comprises a water outlet and a water inlet, and a water flow switch (8) is arranged on the pipeline where the water outlet of the water heat exchange pipeline is located; the refrigerant heat exchange pipeline comprises a refrigerant outlet and a refrigerant inlet; the control method of the heat pump system comprises: When the heat pump system is turned on, the temperature of the refrigerant inlet of the refrigerant heat exchange pipeline is obtained, which is recorded as the refrigerant inlet temperature of the refrigerant heat exchange pipeline; and the temperature of the refrigerant outlet of the refrigerant heat exchange pipeline is obtained, which is recorded as the refrigerant outlet temperature of the refrigerant heat exchange pipeline; Determining whether the water pump of the water system is not turned on, and determining whether the water flow switch (8) is in a conducting state; If it is determined that the water pump of the water system is not turned on and the water flow switch (8) is in the on state, then whether there is water in the water system is detected according to the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and a detection result is obtained, so as to detect whether there is water in the water system when the water pump of the water system is not turned on and the water flow switch (8) is in the on state; According to the detection result, the operation process of the heat pump system is controlled to achieve shutdown protection of the heat pump system when there is no water in the water system, and to control the heat pump system to continue operating when there is water in the water system.

2. The control method of the heat pump system according to claim 1, characterized in that: Detecting whether there is water in the water system according to the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and obtaining a detection result, including: Determine whether the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or determine whether the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is within a set temperature range; If it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or if it is determined that the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is within the set temperature range, it is determined that there is no water in the water system. At this time, the detection result is that the water pump of the water system is not turned on and there is no water in the water system; If it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is different from the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is not within the set temperature range, it is determined that there is water in the water system. At this time, the detection result is that the water pump of the water system is not turned on, but there is water in the water system.

3. The control method of the heat pump system according to claim 2, characterized in that: According to the detection result, the operation process of the heat pump system is controlled, including: When the detection result shows that the water pump of the water system is not turned on and there is no water in the water system, the heat pump system is controlled to shut down, a reminder message of the heat pump system failure is issued, and it is determined that the reason why the water flow switch (8) is in the on state is that the water flow switch (8) is short-circuited; When the detection result is that the water pump of the water system is not turned on but there is water in the water system, the heat pump system is controlled to continue operating, and it is determined that the reason why the water pump of the water system is not turned on but there is water in the water system is that other water pumps supply water to the water system.

4. The control method of the heat pump system according to claim 2, characterized in that: Also includes: In the case where there is water in the water system and the heat pump system is controlled to continue to operate, determining whether the heat pump system continues to operate for a set operating time; If it is determined that the heat pump system has continued to operate for the set operating time, the process returns to re-detect whether there is water in the water system based on the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline.

5. A control device for a heat pump system, characterized in that: The heat pump system comprises a water-side heat exchanger; the water-side heat exchanger comprises a water heat exchange pipeline and a refrigerant heat exchange pipeline, the water heat exchange pipeline is arranged in the water system of the heat pump system, and the refrigerant heat exchange pipeline is arranged in the refrigerant system of the heat pump system; when the heat pump system operates normally, heat can be exchanged between the water heat exchange pipeline and the refrigerant heat exchange pipeline; the water heat exchange pipeline comprises a water outlet and a water inlet, and a water flow switch (8) is arranged on the pipeline where the water outlet of the water heat exchange pipeline is located; the refrigerant heat exchange pipeline comprises a refrigerant outlet and a refrigerant inlet; The control device of the heat pump system comprises: an acquisition unit configured to acquire, when the heat pump system is turned on, a temperature of a refrigerant inlet of the refrigerant heat exchange pipeline, recorded as the refrigerant inlet temperature of the refrigerant heat exchange pipeline; and acquire a temperature of a refrigerant outlet of the refrigerant heat exchange pipeline, recorded as the refrigerant outlet temperature of the refrigerant heat exchange pipeline; A control unit configured to determine whether a water pump of the water system is not turned on, and to determine whether the water flow switch (8) is in an on state; The control unit is further configured to detect whether there is water in the water system according to the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline if it is determined that the water pump of the water system is not turned on and the water flow switch (8) is in the on state, and obtain a detection result, so as to detect whether there is water in the water system when the water pump of the water system is not turned on and the water flow switch (8) is in the on state; The control unit is also configured to control the operation process of the heat pump system according to the detection result, so as to realize shutdown protection of the heat pump system when there is no water in the water system, and control the heat pump system to continue to operate when there is water in the water system.

6. The control device of the heat pump system according to claim 5, characterized in that: The control unit detects whether there is water in the water system according to the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and obtains a detection result, including: Determine whether the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or determine whether the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is within a set temperature range; If it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is the same as the refrigerant outlet temperature of the refrigerant heat exchange pipeline, or if it is determined that the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is within the set temperature range, it is determined that there is no water in the water system. At this time, the detection result is that the water pump of the water system is not turned on and there is no water in the water system; If it is determined that the refrigerant inlet temperature of the refrigerant heat exchange pipeline is different from the refrigerant outlet temperature of the refrigerant heat exchange pipeline, and the absolute value of the temperature difference between the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline is not within the set temperature range, it is determined that there is water in the water system. At this time, the detection result is that the water pump of the water system is not turned on, but there is water in the water system.

7. The control device of the heat pump system according to claim 6, characterized in that: The control unit controls the operation process of the heat pump system according to the detection result, including: When the detection result shows that the water pump of the water system is not turned on and there is no water in the water system, the heat pump system is controlled to shut down, a reminder message of the heat pump system failure is issued, and it is determined that the reason why the water flow switch (8) is in the on state is that the water flow switch (8) is short-circuited; When the detection result is that the water pump of the water system is not turned on but there is water in the water system, the heat pump system is controlled to continue operating, and it is determined that the reason why the water pump of the water system is not turned on but there is water in the water system is that other water pumps supply water to the water system.

8. The control device of the heat pump system according to claim 6, characterized in that: Also includes: The control unit is further configured to determine whether the heat pump system continues to operate for a set operating time when there is water in the water system and the heat pump system is controlled to continue to operate; The control unit is also configured to return to re-detect whether there is water in the water system based on the refrigerant inlet temperature of the refrigerant heat exchange pipeline and the refrigerant outlet temperature of the refrigerant heat exchange pipeline if it is determined that the heat pump system has continued to operate for a set operating time.

9. A heat pump system, characterized in that: include: A control device for a heat pump system according to any one of claims 5 to 8.

10. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the control method of the heat pump system according to any one of claims 1 to 4.

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