Water pump flow fault detection method and device for heat pump air conditioner and heat pump air conditioner

Abstract

The invention provides a fault detection method and device for a heat pump air conditioner and the heat pump air conditioner. The water pump flow fault detection method comprises the steps that S100, the first flow F1 of a water pump in a first time node T1 and the second flow F2 of the water pump in a second time node T2 are detected; s200, detecting whether the water pump has a flow fault or not according to the first flow F1 and the second flow F2; wherein the first time node T1 and the second time node T2 are spaced from each other, and the first time node T1 is earlier than the second time node T2. By adopting the water pump flow fault detection method, the water pump flow can be reasonably and accurately detected in the running process of the water pump, so that the flow fault can be detected in time.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning, and in particular to a water pump flow failure detection method and device for a heat pump air conditioner, and a heat pump air conditioner. Background Art

[0002] Heat pump air conditioners can meet the needs of air conditioning and heating in today's life because of their high reliability and high efficiency. They can also effectively reduce energy consumption and save money without damaging the natural environment. The cost of use is getting lower and lower. More and more people choose to buy and use heat pump air conditioners, and their development prospects are promising. However, when there is a water pump flow failure in a heat pump air conditioner, it will affect the operation of the heat pump air conditioner, and even cause damage to the heat pump air conditioner in severe cases. Therefore, it is very important to provide a method for detecting water pump flow failures in heat pump air conditioners. Summary of the invention

[0003] The present invention aims to solve at least one of the above technical problems.

[0004] To this end, the first object of the present invention is to provide a water pump flow failure detection method for a heat pump air conditioner

[0005] A second object of the present invention is to provide a water pump flow failure detection device for a heat pump air conditioner.

[0006] A third object of the present invention is to provide a heat pump air conditioner.

[0007] To achieve the first objective of the present invention, an embodiment of the present invention provides a water pump flow fault detection method for a heat pump air conditioner, the water pump flow fault detection method comprising: S100, detecting a first flow F1 of the water pump at a first time node T1, and a second flow F2 of the water pump at a second time node T2; S200, detecting whether there is a flow fault in the water pump based on the first flow F1 and the second flow F2; wherein the first time node T1 and the second time node T2 are spaced apart from each other, and the first time node T1 is earlier than the second time node T2.

[0008] Compared with the prior art, the technical effect achieved by adopting the technical solution is as follows: during the operation of the water pump, the flow rate gradually increases with the increase of time, and the flow rate of the water pump at different time nodes is also different. By detecting at least two flow rates at at least two time nodes respectively, it is possible to judge whether there is a flow fault according to the law of water flow increase during the operation of the water pump and the flow rates at different time nodes respectively, and it is possible to make a relatively accurate judgment on whether there is a flow fault in the water pump. After the water pump is turned on, the flow rate increases with the increase of time. The first time node T1 is a period of time after the water pump is started rather than a certain time point. The first flow rate T1 is the flow rate of the water pump in this period of time. There are multiple first flow rates F1 in the first time node T1. Each F1 is detected to determine whether there is a fault in the first time node T1; similarly, the second time node T2 is a period of time after the water pump is started rather than a certain time point. The second flow rate T2 is the flow rate of the water pump in this period of time. There are multiple first flow rates F2 in the second time node T2. Each F2 is detected to determine whether there is a fault in the second time node T2. Since the first time node T1 is before the second time node T2, the first flow F1 should be smaller than the second flow F2. If there is a flow fault in the first flow F1 at the first time node T1, the water pump stops running and no longer enters the second time node T2. If there is no flow fault in the first flow F1 at the first time node T1, the water pump continues to run to the second time node T2, and measures the second flow F2 at the second time node T2, and determines whether there is a flow fault in the second flow F2. By detecting and analyzing the flow at different time nodes, faults can be discovered and eliminated as early as possible.

[0009] In a technical solution of the present invention, detecting whether a water pump has a flow failure according to a first flow rate F1 and a second flow rate F2 includes: comparing the first flow rate F1 with a first flow rate threshold F 阈1 Compare; in the first flow rate F1 always remains less than the first flow rate threshold F 阈1 In this case, it is determined that the water pump has a first flow fault.

[0010] Compared with the prior art, the technical effect achieved by adopting this technical solution is: the first flow threshold F is set 阈1 is the target flow rate that is expected to be achieved at the first time node T1. At the first time node T1, if the first flow rate F1 of the water pump is always less than the first flow rate threshold F 阈1 At this time, the flow in the water pump is too small. The first time node T1 is a relatively short period of time after the water pump is started and operated. At this time, the first flow fault detection is performed, and it can be determined that there is a fault in the water pump flow within a short period of time after the water pump is started and operated.

[0011] In a technical solution of the present invention, according to the first flow rate F1 and the second flow rate F2, detecting whether the water pump has a flow failure also includes: when the first flow rate F1 is greater than the first flow rate threshold F 阈1 In the case of 阈2 Compare; in the second flow rate F2 always remains less than the second flow rate threshold F 阈2 In the case of , it is judged that the water pump has a second flow fault; wherein, the first flow threshold F 阈1 Less than the second flow threshold F 阈2 .

[0012] Compared with the prior art, the technical effect achieved by adopting this technical solution is: in the absence of the first flow failure, the water pump continues to operate until the second time node T2, and the second flow threshold F 阈2 is the target flow rate that is expected to be achieved at the second time node T2. If the second flow rate F2 is always kept less than the second flow rate threshold F 阈2 , that is, the flow rate of the water pump is still small after running for a period of time after being turned on, and it is determined that there is a flow fault.

[0013] In one technical solution of the present invention, the first flow threshold F 阈1 is the second flow threshold F 阈2 5% to 15%.

[0014] Compared with the prior art, the technical effect achieved by adopting the technical solution is as follows: the flow rate in the water pump should increase with the increase of time. When the flow rate in the water pump does not have the first flow rate fault, the second flow rate fault is detected. At this time, the flow rate in the water pump has increased with the increase of time, so the second flow rate threshold F used to judge the second water flow fault 阈2 Should be greater than the first flow threshold F 阈1 , when the first flow threshold F 阈1 is the second flow threshold F 阈2 When the value is between 5% and 15%, it can be better judged whether there is a second flow fault.

[0015] In a technical solution of the present invention, when the water pump does not have a first flow fault and a second flow fault, the detection method further includes: continuously detecting a third flow F of the water pump after the second time node T2; if the third flow F is within the target time period T, always keeping less than the third flow threshold F 阈3 In this case, it is determined that the water pump has a third flow failure.

[0016] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: in the absence of the first flow fault and the second flow fault, flow fault detection is continuously performed within a period T, that is, if the flow of the water pump continues to be small within a short period of time, it is determined that the water pump has a third flow fault, and continuous detection of flow faults can be achieved during the operation of the water pump. If the water pump has a flow fault, it can be detected in time.

[0017] In a technical solution of the present invention, the target time period T is 3s to 10s; and / or the third flow threshold F 阈3 is the second flow threshold F 阈2 5% to 15%.

[0018] Compared with the prior art, the technical effect achieved by adopting this technical solution is: by continuously detecting the flow rate of the water pump in a very short period T, it is possible to continuously detect whether there is a flow fault. The third flow threshold F 阈3 is the second flow threshold F 阈2 When the value is between 5% and 15%, it can be better judged whether there is a third flow failure.

[0019] In a technical solution of the present invention, the first time node T1 is 5 minutes to 10 minutes after the water pump is started; and / or the second time node T2 is 20 minutes to 60 minutes after the water pump is started.

[0020] Compared with the prior art, the technical effect achieved by adopting the technical solution is as follows: the first time node is 5 minutes to 10 minutes after the water pump is started up. If the flow rate cannot reach the expected value within this time period, it is determined as a flow failure and the water pump is stopped; if the water pump does not have the first flow failure, the water pump continues to run until the second time node. The second time node is 20 minutes to 60 minutes after the water pump is started up. At this time, the water pump has been running for a long time. If the flow rate of the water pump is still less than the second flow threshold F at this time, 阈2 , it is determined that there is a flow failure in the water pump.

[0021] In a technical solution of the present invention, the water pump flow fault detection method also includes: when it is determined through the fault detection method that the water pump has a flow fault, controlling the water pump to stop running, cutting off the power, and performing a fault clearing operation after a preset time; restarting the water pump, and cyclically executing the fault detection method; if the fault detection method is executed N times in a row and the result is that the water pump has a flow fault, locking the water pump; wherein N is an integer greater than or equal to 3, and the preset time is greater than or equal to 3 minutes.

[0022] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: when a water flow fault is determined, if the water pump is still running, it may cause damage to the equipment. At this time, the water pump should be controlled to stop running, power off and clear the fault in time; when a water flow fault is determined for multiple times in a row, the water pump should be locked to avoid damage to the equipment.

[0023] To achieve the second purpose of the present invention, an embodiment of the present invention provides a water pump flow fault detection device for a heat pump air conditioner, the water pump flow fault detection device comprising: a fault detection module, the fault detection module is used to respectively detect at least two flow rates of the water pump at at least two time nodes, and detect whether the water pump has a flow fault based on the at least two flow rates.

[0024] The water pump flow fault detection device for a heat pump air conditioner according to an embodiment of the present invention can realize the water pump flow fault detection method for a heat pump air conditioner according to any embodiment of the present invention. The water pump flow fault detection device for a heat pump air conditioner according to an embodiment of the present invention has all the beneficial effects of the water pump flow fault detection method for a heat pump air conditioner according to any embodiment of the present invention, which will not be repeated here.

[0025] To achieve the third purpose of the present invention, an embodiment of the present invention provides a heat pump air conditioner, which includes: a refrigerant circulation system, the refrigerant circulation system has a heat source; a water circulation system, the water circulation system is used to exchange heat with the heat source; a water pump, the water pump is used to drive the flow of water in the water circulation system; and a controller, the controller is used to execute a water pump flow fault detection method as in any embodiment of the present invention.

[0026] The heat pump air conditioner of the embodiment of the present invention has a water pump flow fault detection device for a heat pump air conditioner as in any embodiment of the present invention. The heat pump air conditioner of the embodiment of the present invention has all the beneficial effects of the water pump flow fault detection method for a heat pump air conditioner as in any embodiment of the present invention, which will not be repeated here.

[0027] After adopting the technical solution of the present invention, the following technical effects can be achieved:

[0028] 1. During the entire operation of the water pump, reasonable and accurate fault detection of the water pump flow is carried out so that flow faults can be detected in time;

[0029] 2. The fault can be detected in a short time after the pump is started;

[0030] 3. After a fault is detected, the water pump can be controlled to stop running, the power can be cut off, and the fault clearing operation can be performed after a preset time; if a fault is detected multiple times in a row, the water pump will be locked to avoid equipment damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A flow chart of a method for controlling an air conditioner provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the composition of a heat pump air conditioner provided in an embodiment of the invention. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following Figure 1 to Figure 2 The specific embodiments of the present invention are described in detail.

[0037] [Example 1]

[0038] like Figure 1 As shown, an embodiment of the present invention provides a water pump flow fault detection method for a heat pump air conditioner, the water pump flow fault detection method comprising: S100, detecting a first flow F1 of the water pump at a first time node T1, and a second flow F2 of the water pump at a second time node T2; S200, detecting whether there is a flow fault in the water pump according to the first flow F1 and the second flow F2; wherein the first time node T1 and the second time node T2 are spaced apart from each other, and the first time node T1 is earlier than the second time node T2.

[0039] In the related art, the closure of a target flow switch is usually used to determine whether the water flow is normal. However, the target flow switch has high installation requirements, is prone to water leakage, is prone to freezing in winter, has a large deviation range for water flow detection, and cannot adjust the water flow value for reporting a fault.

[0040] In view of this, the present invention provides a water pump flow fault detection method for a heat pump air conditioner. The method does not require the use of a target flow switch. By separately detecting at least two flow rates at at least two time nodes, flow monitoring of the water pump in accordance with its operating rules can be achieved. Judging whether there is a flow fault based on at least two flow rates can make a more accurate judgment on whether there is a flow fault in the water pump.

[0041] Specifically, after the water pump is started, the flow rate gradually increases with time. Therefore, the flow rate of the water pump is not the same at different time nodes. By measuring the flow rate of the water pump at different time nodes and comparing it with the target value at that time node, it is possible to simply and quickly determine whether there is a water flow failure.

[0042] Preferably, the first time node T1 is a period of time after the water pump is started rather than a certain time point, the first flow F1 is the water pump flow that is continuously fed back during this period, there are multiple first flow F1s within the first time node T1, and each F1 is tested to determine whether there is a fault at the first time node T1; similarly, the second time node T2 is a period of time after the water pump is started rather than a certain time point, the second flow T2 is the water pump flow that is continuously fed back during this period, there are multiple second flow F2s within the second time node T2, and each F2 is tested to determine whether there is a fault at the second time node T2. The "first" and "second" in the first time node T1, the first flow T1, the second time node T2, and the second flow F1 are only used to distinguish and prevent ambiguity, and do not indicate that they have a sequence or size relationship.

[0043] Preferably, since the flow rate gradually increases with time after the water pump is turned on, at the earlier first time node T1, the first flow rate F1 is also small, and the water pump flow rate is detected for faults at this time. If the water pump does not have a flow fault, the pump continues to run and enters the second time node T2. The second flow rate F2 also increases with time, and the water pump flow rate is detected for faults again at this time.

[0044] Preferably, fault detection is performed on the two flow rates of the second time node T2 water pump at two consecutive time nodes, so that the water pump flow rate can be reasonably and accurately detected in accordance with the water pump operation law, so that the flow fault can be detected in time.

[0045] Preferably, the flow rate can be measured by installing a flow meter on the water pump to measure the flow rate or by measuring the flow velocity under a constant flow cross-sectional area to obtain the flow rate.

[0046] Preferably, the water pump is a DC water pump with a flow feedback function. Compared with an ordinary water pump equipped with a flow meter, the DC water pump with a flow feedback function is not only easy to install, but also has the function of automatically adjusting the flow rate, and the adjustment is convenient and flexible.

[0047] It should be noted that the numbering of the detection methods is only for the convenience of description and does not mean that there is a sequence of precedence between them.

[0048] In some implementations of the embodiments of the present invention, detecting whether a water pump has a flow failure according to the first flow rate F1 and the second flow rate F2 includes: comparing the first flow rate F1 with the first flow rate threshold F 阈1 Compare; in the first flow rate F1 always remains less than the first flow rate threshold F 阈1 In this case, it is determined that the water pump has a first flow fault.

[0049] Preferably, the first flow threshold F 阈1 To set the target flow rate that the water pump is expected to achieve at the first time node T1, at which time the multiple first flow rates F1 of the water pump are all less than the first flow rate threshold F 阈1 , the flow in the water pump is too small, and it can be determined in a short time that there is a fault in the water pump flow.

[0050] Preferably, the first flow rate F1 is always kept less than the first flow rate threshold F 阈1 In the case of , it is determined that the water pump has a first flow failure; when the first flow F1 always remains greater than the first flow threshold F 阈1 In the case of , it is determined that the water pump does not have a first flow fault; when the first flow F1 is always kept equal to the first flow threshold F 阈1 In this case, those skilled in the art can determine whether the water pump has a first flow fault based on actual conditions.

[0051] In some implementations of the embodiments of the present invention, detecting whether the water pump has a flow failure according to the first flow rate F1 and the second flow rate F2 further includes: when the first flow rate F1 is greater than the first flow rate threshold F 阈1 In the case of 阈2 Compare; in the second flow rate F2 always remains less than the second flow rate threshold F 阈2 In the case of , it is judged that the water pump has a second flow fault; wherein, the first flow threshold F 阈1 Less than the second flow threshold F 阈2 .

[0052] Preferably, in the absence of the first flow failure, the water pump continues to run, enters the second time node T2, and continuously detects the flow in the water pump. After the water pump runs for a long period of time, the flow of the water pump also continues to increase. By comparing the second flow F2 at the second time node T2 with the second flow threshold F 阈2 Compare to determine whether there is a second water flow fault.

[0053] Preferably, since the second time node T2 is later than the first time node T1, the flow rate of the water pump is also increasing as time increases. Therefore, the second flow rate threshold F of the target flow rate expected to be reached at the second time node T2 is 阈2 It should be a value that is higher than the first flow threshold F 阈1 It is larger.

[0054] Preferably, if the second flows F2 within the second time node T2 are all less than the second flow threshold F 阈2 In the case of , it is judged that the water pump has a second flow fault; if the second flow F2 is greater than the second flow threshold F 阈2 In the case of , it is judged that the water pump does not have a second flow fault; if the second flow F2 always remains equal to the second flow threshold F 阈2 In this case, those skilled in the art can determine whether the water pump has a second flow fault based on actual conditions.

[0055] In some implementations of the present invention, the first flow threshold F 阈1 is the second flow threshold F 阈2 5% to 15%.

[0056] Preferably, the flow rate in the water pump should increase with time. When the flow rate in the water pump does not have the first flow rate fault, the second flow rate fault is detected. At this time, the flow rate in the water pump has increased with time, so the second flow rate threshold F used to judge the second water flow fault is 阈2 Should be greater than the first flow threshold F 阈1 , when the first flow threshold F 阈1 is the second flow threshold F 阈2 When the value is between 5% and 15%, it can be better judged whether there is a second flow fault.

[0057] Preferably, the second flow threshold F 阈2 1-10m 3 / h, the first flow threshold F 阈1 Preferably, the second flow threshold F 阈2 10%, i.e. the first flow threshold F 阈1 Preferably 0.1-1m 3 / h.

[0058] In some implementations of the embodiments of the present invention, when the water pump does not have a first flow fault and a second flow fault, the fault detection method further includes: continuously detecting a third flow F of the water pump after the second time node T2; if the third flow F is within the target time period T, it always remains less than the third flow threshold F 阈3 In this case, it is determined that the water pump has a third flow failure.

[0059] Preferably, in the absence of the first flow failure and the second flow failure, the water pump will continue to operate. If the third flow rate F of the water pump in a short period is continuously small, or even continuously smaller than the third flow rate threshold F 阈3 If the water pump fails, it is determined that there is a third flow failure.

[0060] Preferably, if the third flow rate F is always kept less than the third flow rate threshold F within the target time period T, 阈3 In the case of , it is determined that the water pump has a third flow fault; if the third flow F is always greater than the third flow threshold F within the target time period T, 阈3 In the case of , it is determined that the water pump does not have a third flow fault; if the third flow F is within the target time period T, it always remains equal to the third flow threshold F 阈3 In this case, those skilled in the art can determine whether the water pump has a third flow fault based on actual conditions.

[0061] It should be noted that, when it is determined that the water pump does not have the first flow fault and the second flow fault, there are multiple cycles T during the continuous operation of the water pump, and the flow rate of each cycle T is compared with the third flow threshold F 阈3 By comparison, it is possible to determine whether there is a water flow fault. In this way, the entire water pump operation process can be tested and water flow faults can be detected in time.

[0062] In some implementations of the embodiments of the present invention, the target time period T is 3s to 10s; and / or the third flow threshold F 阈3 is the second flow threshold F 阈2 5% to 15%.

[0063] Preferably, in the absence of the first flow fault and the second flow fault, the flow rate of the water pump has reached the second flow threshold F 阈2 , that is, the flow rate has increased to the target flow rate. At this time, the flow rate is continuously detected. If the flow rate of the water pump continues to be small within a short period of time, the water pump has a third flow fault.

[0064] Preferably, the flow rate of the water pump is continuously detected in a short period of time T, so that continuous detection of whether there is a flow fault can be achieved. The third flow threshold F 阈3is the second flow threshold F 阈2 When the value is between 5% and 15%, it can be better judged whether there is a third flow failure.

[0065] Preferably, the third flow threshold F 阈3 is the second flow threshold F 阈2 10%, that is, the third flow threshold F 阈3 Preferably 0.1-1m 3 / h.

[0066] In some implementations of the embodiments of the present invention, the first time node T1 is 5 minutes to 10 minutes after the water pump is started; and / or the second time node T2 is 20 minutes to 60 minutes after the water pump is started.

[0067] Preferably, the first time node is 5 to 10 minutes after the water pump is started and operated. If the flow rate cannot reach the expected value within this time period, it is determined that a first flow fault exists and the water pump stops running. If the water pump does not have a first water flow fault, the water pump continues to run until a second time node. The second time node is 20 to 60 minutes after the water pump is started and operated. If the water pump continues to run for a period of time in the absence of a first flow fault and still cannot reach the expected flow value, it is determined that a second flow fault exists.

[0068] In some implementations of the embodiments of the present invention, the water pump flow fault detection method also includes: when it is determined through the fault detection method that the water pump has a flow fault, controlling the water pump to stop running, cutting off the power, and performing a fault clearing operation after a preset time; restarting the water pump, and cyclically executing the fault detection method; if the result of executing the fault detection method for N consecutive times is that the water pump has a flow fault, locking the water pump; wherein N is an integer greater than or equal to 3, and the preset time is greater than or equal to 3 minutes.

[0069] Preferably, when a water flow fault is determined, the water pump is promptly controlled to stop running, the power is cut off, and the fault clearing operation is performed; when a water flow fault is determined for multiple times in succession, the water pump is locked to avoid damage to the equipment due to flow failure.

[0070] Preferably, the preset time is set to 3 minutes. Within 3 minutes, the DC water pump can quickly adjust the flow rate to eliminate the fault, so that the water pump can resume operation in a short time; the number of repetitions of S100 is set to three times. If the water pump is determined to have a flow fault for three consecutive times, it means that the DC water pump cannot eliminate the fault by itself. In order to prevent the water pump from being damaged by running again, the water pump is locked and waits for maintenance.

[0071] [Example 2]

[0072] An embodiment of the present invention provides a water pump flow fault detection device for a heat pump air conditioner, the water pump flow fault detection device comprising: a fault detection module, the fault detection module is used to respectively detect at least two flow rates of the water pump at at least two time nodes, and detect whether the water pump has a flow fault based on the at least two flow rates.

[0073] Preferably, the flow fault detection device of the water pump contains a fault detection module, which is used to detect whether the water pump has a flow fault. The module detects the water pump flow after the water pump is started and continues to detect the flow during the entire operation of the water pump. That is, flow faults occurring at any time during the operation of the water pump can be detected, thereby eliminating flow faults to the greatest extent and ensuring the safety of the equipment.

[0074] Preferably, after the water pump is started, the fault detection module is also started, and the first flow rate F1 and the first flow rate threshold F 阈1 Compare and judge whether there is a first flow fault; the second flow F2 within 20min to 60min after the pump is started and the second flow threshold F 阈2 Compare and determine whether there is a second flow fault; set multiple 3s to 10s cycles 60 minutes after the pump is started, and the flow rate F within the cycle is equal to the third flow threshold F 阈3 A comparison is made to determine whether there is a third flow fault; if there is a flow fault, a fault clearing operation is performed to clear the flow fault; if a flow fault is detected multiple times in succession, the operation is stopped and the water pump is locked.

[0075] [Example 3]

[0076] like Figure 2 As shown, an embodiment of the present invention provides a heat pump air conditioner, which includes: a refrigerant circulation system, the refrigerant circulation system has a heat source; a water circulation system, the water circulation system is used to exchange heat with the heat source; a water pump, the water pump is used to drive the flow of water in the water circulation system; and a controller, the controller is used to execute a water pump flow fault detection method as in any embodiment of the present invention.

[0077] Preferably, in a heat pump air conditioner, a water pump drives the water in the water circulation system to flow, prompting the water circulation system to complete the cold and heat exchange, and the refrigerant circulation system continuously circulates to achieve a cooling effect. The controller sets a flow threshold, and the flow fed back by the water pump is compared with the flow threshold to detect whether there is a flow fault in the water pump.

[0078] Preferably, the heat pump air conditioner is driven by electric energy to operate, and the purpose of cooling is ultimately achieved through repeated cold and heat exchange.

[0079] Preferably, the heat source is the heat of water flow in the water circulation system, and the refrigerant circulation system can absorb the heat of the water flow and cool it, and the water circulation system performs heat exchange to complete the refrigeration.

[0080] Preferably, the refrigerant circulation system also includes a compressor, which plays a role in compressing and driving the refrigerant in the refrigerant circulation system of the heat pump air conditioner, so that the refrigerant circulation system can achieve a better refrigeration effect.

[0081] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A fault detection method for a heat pump air conditioner, characterized in that: The fault detection method comprises: S100, detecting a first flow rate F1 of the water pump at a first time node T1, and a second flow rate F2 of the water pump at a second time node T2; S200, detecting whether the water pump has a flow failure according to the first flow rate F1 and the second flow rate F2; The first time node T1 and the second time node T2 are spaced apart from each other, and the first time node T1 is earlier than the second time node T2.

2. The flow fault detection method according to claim 1, characterized in that: The detecting whether the water pump has a flow failure according to the first flow rate F1 and the second flow rate F2 includes: The first flow rate F1 and the first flow rate threshold F 阈1 Make comparisons; The first flow rate F1 always remains less than the first flow rate threshold F 阈1 , it is determined that the water pump has a first flow fault.

3. The flow fault detection method according to claim 2, characterized in that: The detecting whether the water pump has a flow failure according to the first flow rate F1 and the second flow rate F2 further includes: When the first flow rate F1 is greater than the first flow rate threshold F 阈1 In the case of 阈2 Make comparisons; The second flow rate F2 always remains less than the second flow rate threshold F 阈2 In the case of , determining that the water pump has a second flow fault; Among them, the first flow threshold F 阈1 Less than the second flow threshold F 阈2 .

4. The flow fault detection method according to claim 3, characterized in that: The first flow threshold F 阈1 The second flow threshold F 阈2 5% to 15%.

5. The flow fault detection method according to claim 3, characterized in that: In the case that the water pump does not have the first flow fault and the second flow fault, the fault detection method further includes: Continuously detecting a third flow rate F of the water pump after the second time node T2; If the third flow rate F is within the target time period T, it always remains less than the third flow rate threshold F 阈3 , it is determined that the water pump has a third flow fault.

6. The flow fault detection method according to claim 7, characterized in that: The target time period T is 3s to 10s; and / or The third flow threshold F 阈3 The second flow threshold F 阈2 5% to 15%.

7. The flow fault detection method according to any one of claims 1 to 6, characterized in that: The first time node T1 is 5 minutes to 10 minutes after the water pump is started; and / or The second time node T2 is 20 minutes to 60 minutes after the water pump is started.

8. The flow fault detection method according to any one of claims 1 to 6, characterized in that: The water pump flow failure detection method also includes: When it is determined through S100 to S200 that the water pump has a flow fault, the water pump is controlled to stop running, power off, and perform a fault clearing operation after a preset time; Restart the water pump and execute S100 to S200 cyclically; If the result of executing the fault detection method N times in a row is that the water pump has a flow fault, locking the water pump; Wherein, N is an integer greater than or equal to 3, and the preset time is greater than or equal to 3 minutes.

9. A water pump flow fault detection device for a heat pump air conditioner, characterized in that: The water pump flow fault detection device comprises: A fault detection module, the fault detection module is used to respectively detect at least two flow rates of the water pump at at least two time nodes, and detect whether the water pump has a flow fault based on the at least two flow rates.

10. A heat pump air conditioner, characterized in that: The heat pump air conditioner comprises: A refrigerant circulation system, wherein the refrigerant circulation system has a heat source; A water circulation system, wherein the water circulation system is used to exchange heat with the heat source; A water pump, the water pump is used to drive the water flow in the water circulation system; A controller, wherein the controller is used to execute the water pump flow fault detection method according to any one of claims 1 to 9.

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