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

Abstract

The application 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 following steps: S100, detecting a first flow F1 of the water pump within a first time node T1 and a second flow F2 of the water pump within a second time node T2; S200, detecting whether the water pump has a flow fault according to the first flow F1 and the second flow F2; wherein the first time node T1 and the second time node T2 are mutually spaced, and the first time node T1 is earlier than the second time node T2. The water pump flow fault detection method can reasonably and accurately detect the flow of the water pump during the operation of the water pump, so that the flow fault can be detected in time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioners, and in particular, the present application relates to a water pump flow fault detection method and device for a heat pump air conditioner, and a heat pump air conditioner. BACKGROUND

[0002] The heat pump air conditioner can meet the demand of air conditioning heating in today's life due to its high reliability and high efficiency, and effectively reduces energy consumption without wasting the natural environment, saves expenses, and the use cost is lower and lower, more and more people choose to purchase and use the heat pump air conditioner, and its development prospect is promising. However, when there is a water pump flow fault in the heat pump air conditioner, the operation of the heat pump air conditioner will be affected, and even the heat pump air conditioner will be damaged in severe cases. Therefore, it is very important to provide a water pump flow fault detection method for a heat pump air conditioner. SUMMARY

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

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

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

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

[0007] To achieve the first object of the present application, an embodiment of the present application 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 within a first time node T1, and a second flow F2 of the water pump within a second time node T2; S200, detecting whether the water pump has a flow fault according to the first flow F1 and the second flow F2; wherein the first time node T1 and the second time node T2 are mutually spaced, and the first time node T1 is earlier than the second time node T2.

[0008] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: in the operation process of the water pump, the flow gradually increases with the increase of time, and the flow of the water pump is different at different time nodes; by detecting at least two flows at at least two time nodes respectively, whether the flow fault exists can be determined according to the flow increase law in the operation process of the water pump and the flow at different time nodes respectively, and whether the flow fault of the water pump exists can be more accurately determined. The flow of the water pump increases with the increase of time after the water pump is started, 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 T1 is the flow of the water pump in the period of time, and there are a plurality of first flows F1 in the first time node T1, and each F1 is detected to determine whether a fault exists 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 T2 is the flow of the water pump in the period of time, and there are a plurality of first flows F2 in the second time node T2, and each F2 is detected to determine whether a fault exists 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 less than the second flow F2, if the first flow F1 at the first time node T1 has a flow fault, the water pump stops running and does not enter the second time node T2; if the first flow F1 at the first time node T1 does not have a flow fault, the water pump continues to run to the second time node T2, and the second flow F2 at the second time node T2 is measured, and whether the second flow F2 has a flow fault is determined, and by detecting and analyzing the flow at different time nodes, the fault can be found as soon as possible and eliminated.

[0009] In one technical scheme of the present application, whether the water pump has a flow fault is detected according to the first flow F1 and the second flow F2, including: comparing the first flow F1 with a first flow threshold F 阈1 ; and determining that the water pump has a first flow fault if the first flow F1 always remains less than the first flow threshold F 阈1 .

[0010] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: the first flow threshold F 阈1 is set as a target flow at the first time node T1, and if the first flow F1 of the water pump always remains less than the first flow threshold F 阈1 at the first time node T1, the flow in the water pump is too small at this time, the first time node T1 is a relatively short period of time after the water pump is started, and the detection of the first flow fault at this time can determine whether the flow of the water pump has a fault in a short time after the water pump is started.

[0011] In one technical solution of the present application, according to the first flow F1 and the second flow F2, whether the water pump has a flow fault is detected, and the detection method further comprises: in the case that the first flow F1 is greater than a first flow threshold F 阈1 , the second flow F2 is compared with a second flow threshold F 阈2 ; in the case that the second flow F2 always remains less than the second flow threshold F 阈2 , it is determined that the water pump has a second flow fault; wherein the first flow threshold F 阈1 is less than the second flow threshold F 阈2 .

[0012] Compared with the prior art, the technical effects achieved by adopting the technical solution are: in the case that there is no first flow fault, the water pump continuously runs to a second time node T2, the second flow threshold F 阈2 is a target flow at the second time node T2, and if the second flow F2 always remains less than the second flow threshold F 阈2 , that is, the flow of the water pump after running for a period of time after being turned on is still small, it is determined that there is a flow fault.

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

[0014] Compared with the prior art, the technical effects achieved by adopting the technical solution are: the flow in the water pump should increase with time, in the case that there is no first flow fault in the water pump, the second flow fault is detected, at this time, the flow in the water pump has increased with time, and therefore the second flow threshold F 阈2 used to determine the second flow fault should be greater than the first flow threshold F 阈1 , and when the first flow threshold F 阈1 is 5% to 15% of the second flow threshold F 阈2 , the second flow fault can be better determined.

[0015] In one technical solution of the present application, in the case that the water pump has no first flow fault and no second flow fault, the detection method further comprises: continuously detecting a third flow F of the water pump after the second time node T2; and in the case that the third flow F always remains less than a third flow threshold F 阈3 within a target time period T, it is determined that the water pump has a third flow fault.

[0016] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: in the absence of the first flow fault and the second flow fault, the flow fault detection is continuously performed in the period T, that is, if the flow of the water pump is continuously small in a short time, it is determined that the water pump has the third flow fault, and the continuous detection of the flow fault during the operation of the water pump can be realized, and if the water pump has the flow fault, the water pump can be detected in time.

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

[0018] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: the flow of the water pump is continuously detected in a very short period T, and the continuous detection of whether the flow has a fault can be realized; when the third flow threshold F 阈3 is 5% to 15% of the second flow threshold F 阈2 , the third flow fault can be better determined.

[0019] In one technical scheme of the present application, the first time node T1 is 5min to 10min after the water pump is started to operate; and / or the second time node T2 is 20min to 60min after the water pump is started to operate.

[0020] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: the first time node is 5min to 10min after the water pump is started to operate, if the flow cannot reach the expected value in this time period, it is determined that the flow has a fault and the water pump is stopped to operate; in the absence of the first flow fault of the water pump, the water pump is continuously operated to the second time node, the second time node is 20min to 60min after the water pump is started to operate, at this time, the water pump has been operated for a long time, if the flow of the water pump is still less than the second flow threshold F 阈2 at this time, it is determined that the water pump has a flow fault.

[0021] In one technical scheme of the present application, the water pump flow fault detection method further comprises: in the case that it is determined by the fault detection method that the water pump has a flow fault, the water pump is controlled to stop to operate and to be powered off, and a fault clearing operation is performed after a preset time; the water pump is restarted, and the fault detection method is cyclically executed; if the determination results of the fault detection method are all that the water pump has a flow fault for N consecutive times, the water pump is locked; wherein N is an integer greater than or equal to 3, and the preset time is greater than or equal to 3min.

[0022] Compared with the prior art, the technical effects reached by the technical scheme are as follows: when it is determined that the water flow is faulty, if the water pump is still running, the equipment may be damaged, at this time, the water pump should be controlled to stop running, be powered off and the fault be cleared; when it is determined that the water flow is faulty for continuous multiple times, the water pump is locked to avoid damaging the equipment.

[0023] To achieve the second object of the present application, the embodiment of the present application 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 being configured to detect at least two flows of the water pump at at least two time nodes respectively, and detect whether the water pump has a flow fault according to the at least two flows.

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

[0025] To achieve the third object of the present application, the embodiment of the present application provides a heat pump air conditioner, the heat pump air conditioner comprising: a refrigerant circulation system, the refrigerant circulation system having a heat source; a water circulation system, the water circulation system being configured to exchange heat with the heat source; a water pump, the water pump being configured to drive water in the water circulation system to flow; and a controller, the controller being configured to execute the water pump flow fault detection method of any embodiment of the present application.

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

[0027] After the technical scheme of the present application is adopted, the following technical effects can be achieved:

[0028] 1. The flow of the water pump is reasonably and accurately detected during the whole operation of the water pump, so that the flow fault can be detected in time;

[0029] 2. The fault can be detected within a short time after the water pump is started to operate;

[0030] 3. After the fault is detected, the water pump can be controlled to stop running and be powered off, and a fault clearing operation can be performed after a preset time; the water pump is locked after the fault is detected for continuous multiple times, so as to avoid damaging the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Fig. 1 A flowchart of an air conditioner control method provided in an embodiment of the present invention;

[0033] Fig. 2 A schematic diagram of a heat pump air conditioner provided for an embodiment of the invention. Detailed Implementation

[0034] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the following description is provided in conjunction with... Figs. 1-2 Specific embodiments of the present invention will be described in detail below.

[0037]

Example 1

[0038] like Fig. 1 As shown, an embodiment of the present invention provides a method for detecting water pump flow faults in a heat pump air conditioner. The method includes: S100, detecting a first flow rate F1 of the water pump in a first time node T1 and a second flow rate F2 of the water pump in a second time node T2; S200, detecting whether there is a flow fault in the water pump based on the first flow rate F1 and the second flow rate 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 related technologies, the closure of a target flow switch is usually used to determine whether the water flow is normal. However, target flow switches have high installation requirements, are prone to leakage, are prone to freezing in winter, have a large deviation range in water flow detection, and cannot adjust the water flow value that reports a fault.

[0040] Therefore, the application provides a water pump flow fault detection method for a heat pump air conditioner, which does not need to use a target flow switch, can realize flow monitoring of the water pump in line with its operation law by detecting at least two flows at at least two time nodes, and can make a relatively accurate judgment on whether the water pump has a flow fault according to the at least two flows.

[0041] Specifically, after the water pump is started, the flow gradually increases with time, so the flow of the water pump at different time nodes is also different. By measuring the flow of the water pump at different time nodes and comparing it with the target value at the time node, it can be determined whether there is a water flow fault.

[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 flow of the water pump continuously fed back in this period of time, and there are multiple first flows 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 T2 is the flow of the water pump continuously fed back in this period of time, and there are multiple second flows F2 in the second time node T2. Each F2 is detected to determine whether there is a fault in 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 F2 are only used to distinguish and prevent ambiguity, and do not mean that they have a sequence or size relationship.

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

[0044] Preferably, the flow of the water pump at the second time node T2 is detected for fault at two time nodes in sequence, so that the flow of the water pump can be reasonably and accurately detected for fault in line with the operation law of the water pump, and the flow fault can be detected in time.

[0045] Preferably, the flow can be measured by adding a flow meter to the water pump or measuring the flow rate under the condition that the flow cross-sectional area is constant to obtain the flow.

[0046] Preferably, the water pump is selected as a direct-current water pump with flow feedback function. Compared with the common water pump with a flow meter, the direct-current water pump with flow feedback function is not only convenient to install, but also has the function of automatically adjusting the size of the flow, which is convenient and flexible to adjust.

[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 sequential relationship.

[0048] In some embodiments of the embodiment of the application, whether the water pump has a flow failure is detected according to the first flow F1 and the second flow F2, comprising: comparing the first flow F1 with a first flow threshold F 阈1 ; in the case that the first flow F1 always remains less than the first flow threshold F 阈1 , it is determined that the water pump has a first flow failure.

[0049] Preferably, the first flow threshold F 阈1 is set as the target flow that the water pump is expected to reach at the first time node T1, at this time, the plurality of first flows F1 of the water pump are all less than the first flow threshold F 阈1 , and the flow in the water pump is too small, so that the flow failure of the water pump can be determined in a short time.

[0050] Preferably, in the case that the first flow F1 always remains less than the first flow threshold F 阈1 , it is determined that the water pump has a first flow failure; in the case that the first flow F1 always remains greater than the first flow threshold F 阈1 , it is determined that the water pump does not have a first flow failure; in the case that the first flow F1 always remains equal to the first flow threshold F 阈1 , whether the water pump has a first flow failure can be determined by a person skilled in the art according to the actual situation.

[0051] In some embodiments of the embodiment of the application, whether the water pump has a flow failure is detected according to the first flow F1 and the second flow F2, and further comprising: in the case that the first flow F1 is greater than the first flow threshold F 阈1 , comparing the second flow F2 with a second flow threshold F 阈2 ; in the case that the second flow F2 always remains less than the second flow threshold F 阈2 , it is determined that the water pump has a second flow failure; wherein the first flow threshold F 阈1 is 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, and the flow in the water pump is continuously detected after the second time point T2. After the water pump runs for a relatively long period of time, the flow in the water pump continuously increases. The second flow F2 at the second time point T2 is compared with the second flow threshold F 阈2 to determine whether the second flow failure exists.

[0053] Preferably, since the second time point T2 is later than the first time point T1, the flow in the water pump continuously increases in the process of time growth. Therefore, the second flow threshold F 阈2 that the water pump is expected to reach at the second time point T2 should be greater than the first flow threshold F 阈1 .

[0054] Preferably, if all the second flows F2 at the second time point T2 are less than the second flow threshold F 阈2 , it is determined that the water pump has the second flow failure; if the second flow F2 is greater than the second flow threshold F 阈2 , it is determined that the water pump does not have the second flow failure; if the second flow F2 always remains equal to the second flow threshold F 阈2 , a person skilled in the art can determine whether the water pump has the second flow failure according to actual conditions.

[0055] In some embodiments of the embodiment of the application, the first flow threshold F 阈1 is 5% to 15% of the second flow threshold F 阈2 .

[0056] Preferably, the flow in the water pump should increase with time. In the absence of the first flow failure, the second flow failure is detected. At this time, the flow in the water pump has increased with time, and therefore the second flow threshold F 阈2 used to determine the second flow failure should be greater than the first flow threshold F 阈1 . When the first flow threshold F 阈1 is 5% to 15% of the second flow threshold F 阈2 , the second flow failure can be better determined.

[0057] Preferably, the second flow threshold F 阈2 is 1-10 m 3 / h, and the first flow threshold F 阈1 is preferably 10% of the second flow threshold F 阈2 , that is, the first flow threshold F 阈1 is preferably 0.1-1 m 3 / h.

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

[0059] Preferably, in the case that the water pump does not have the first flow failure and the second flow failure, the water pump will continue to run, and if the third flow F of the water pump is continuously small, even less than the third flow threshold F 阈3 within a short period of time, it is determined that the water pump has a third flow failure.

[0060] Preferably, if the third flow F is always less than the third flow threshold F 阈3 within the target time period T, it is determined that the water pump has a third flow failure; if the third flow F is always greater than the third flow threshold F 阈3 within the target time period T, it is determined that the water pump does not have a third flow failure; if the third flow F is always equal to the third flow threshold F 阈3 within the target time period T, the skilled in the art can determine whether the water pump has a third flow failure according to the actual situation.

[0061] It should be noted that, in the case that it is determined that the water pump does not have the first flow failure and the second flow failure, during the time when the water pump continues to run, there are multiple periods T, and the flow of each period T is compared with the third flow threshold F 阈3 to determine whether there is a flow failure, so that the entire water pump running process can be detected, and the flow failure can be detected in time.

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

[0063] Preferably, in the case that the water pump does not have the first flow failure and the second flow failure, the flow of the water pump has reached the second flow threshold F 阈2 , that is, the flow has increased to the target flow, and at this time the flow is continuously detected, and if the flow of the water pump is continuously small within a short period of time, the water pump has a third flow failure.

[0064] Preferably, the flow of the water pump is continuously detected within a very short period of time T, so that continuous detection of whether the flow has a failure can be realized, and the third flow threshold F 阈3the second flow threshold F 阈2 The third flow threshold F

[0065] The third flow threshold F 阈3 阈2 The third flow threshold F 阈3 The third flow threshold F 3 is preferably 0.1-1 m

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

[0067] Preferably, the first time node is 5-10 minutes after the water pump is started. If the flow cannot reach the expected value within this time period, it is determined that there is a first flow fault and the water pump is stopped. If the water pump does not have a first flow fault, the water pump continues to run until the second time node, which is 20-60 minutes after the water pump is started. If the water pump cannot reach the expected flow value after running for a period of time without a first flow fault, it is determined that there is a second flow fault.

[0068] In some embodiments of the present application, the water pump flow fault detection method further comprises: in the case where it is determined by the fault detection method that the water pump has a flow fault, controlling the water pump to stop running and be powered off, and performing a fault clearing operation after a preset time; restarting the water pump and cyclically executing the fault detection method; if the determination results of the fault detection method are all that the water pump has a flow fault for N consecutive times, 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 it is determined that there is a flow fault, the water pump is controlled to stop running and be powered off in a timely manner and a fault clearing operation is performed; when it is determined that there is a flow fault for multiple consecutive times, the water pump is locked to avoid damage to the equipment caused by the flow fault.

[0070] Preferably, the preset time is set to 3 minutes, within which time the DC water pump can quickly adjust the flow to eliminate the fault, so that the water pump can be restored to run in a short time; the number of times of repeating execution S100 is set to three, 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, so the water pump is locked to prevent damage to the equipment caused by running the water pump again.

[0071]

Example 2

[0072] ​An embodiment of the present invention provides a water pump flow fault detection device for heat pump air conditioners. The water pump flow fault detection device includes a fault detection module, which is used to detect at least two flow rates of the water pump at at least two time points, and to detect whether there is a flow fault in the water pump based on the at least two flow rates.

[0073] Preferably, the water pump flow fault detection device includes a fault detection module. This module is used to detect whether there is a flow fault in the water pump. The module detects the water pump flow rate after the water pump is started and continues to detect the flow rate throughout the entire operation of the water pump. That is, a flow fault can be detected at any time during the operation of the water pump, thus eliminating the possibility of 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 activated, and the first flow rate F1 and the first flow rate threshold F are compared within 5 to 10 minutes after the water pump is started. 阈1 A comparison is made to determine if a first flow rate fault exists; the second flow rate F2 is compared with the second flow rate threshold F during the 20-60 minute period after the water pump is started. 阈2 A comparison is made to determine if a second flow fault exists; multiple 3-second to 10-second cycles are set after 60 minutes of pump startup, and the flow rate F within each cycle is compared with the third flow threshold F. 阈3 The system compares the flow rate to determine if a third flow rate fault exists. If a flow rate fault exists, a fault clearing operation is performed to eliminate the fault. If a flow rate fault is detected multiple times consecutively, the system stops operation and locks the water pump.

[0075]

Example 3

[0076] like Fig. 2 As shown, an embodiment of the present invention provides a heat pump air conditioner, which includes: a refrigerant circulation system having a heat source; a water circulation system for exchanging heat with the heat source; a water pump for driving the flow of water in the water circulation system; and a controller for executing a water pump flow fault detection method as described in any embodiment of the present invention.

[0077] Preferably, in a heat pump air conditioner, a water pump drives the water flow in the water circulation system, enabling the water circulation system to complete heat exchange. The refrigerant circulation system continuously circulates to achieve a cooling effect. A flow threshold is set by a controller, and the flow rate 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 electricity and achieves the purpose of cooling by repeatedly exchanging heat and cold.

[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 water flow and refrigerate, and the water circulation system can exchange heat to complete refrigeration.

[0080] Preferably, the refrigerant circulation system further comprises a compressor, which can compress the refrigerant to drive the refrigerant, so that the refrigerant circulation system can achieve better refrigeration effect.

[0081] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean 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 application is disclosed as above, the present application is not limited to this. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and therefore the protection scope of the present application should 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 a water pump within a first time node T1, and a second flow rate F2 of the water pump within a second time node T2; S200, detecting whether the water pump has a flow rate fault according to the first flow rate F1 and the second flow rate F2; comparing the first flow rate Fl to a first flow rate threshold F 阈1 threshold; in the case where the first flow rate Fl remains smaller than the first flow rate threshold F 阈1 , it is determined that the water pump has a first flow rate failure; In case said first flow rate F1 is greater than said first flow rate threshold F 阈1 , said second flow rate F2 is compared with a second flow rate threshold F 阈2 . in the case where the second flow rate F2 remains less than the second flow rate threshold F 阈2 , it is determined that the water pump has a second flow rate failure; wherein the first flow threshold F 阈1 less than the second flow threshold F阈2 ; wherein the first time node T1 and the second time node T2 are mutually spaced, and the first time node T1 is earlier than the second time node T2.

2. The fault detection method according to claim 1, characterized in that, said first flow threshold F 阈1 is 5% to 15% of said second flow threshold F 阈2 .

3. The fault detection method according to claim 1, characterized in that, in the case that the water pump does not have the first flow rate fault and the second flow rate fault, the fault detection method further comprises: continuously detecting a third flow rate F of the water pump after the second time node T2; If the third flow rate F is always kept less than a third flow rate threshold F 阈3 in a target time period T, it is determined that the water pump has a third flow rate failure.

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

5. The fault detection method according to any one of claims 1 to 4, characterized in that, the first time node T1 is 5min to 10min after the water pump is started to operate; and / or the second time node T2 is 20min to 60min after the water pump is started to operate.

6. The fault detection method according to any one of claims 1 to 4, characterized in that, the fault detection method further comprises: in the case that it is determined through the S100 to S200 that the water pump has a flow rate fault, controlling the water pump to stop operating, to be powered off, and to perform a fault clearing operation after a preset time; restarting the water pump, and cyclically executing the S100 to S200; if the determination results of the fault detection method are all that the water pump has a flow rate fault for N consecutive times, 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 3min.

7. A water pump flow rate fault detection device for a heat pump air conditioner, characterized in that, the water pump flow rate fault detection device comprises: a fault detection module, configured to detect at least two flow rates of the water pump at at least two time nodes respectively, and to detect whether the water pump has a flow rate fault according to the at least two flow rates.

8. A heat pump air conditioner, characterized in that, the heat pump air conditioner comprises: a refrigerant circulation system having a heat source; a water circulation system configured to exchange heat with the heat source; a water pump configured to drive water in the water circulation system to flow; a controller configured to execute the fault detection method according to any one of claims 1 to 7.

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