Air conditioner refrigerant leakage detection method, air conditioner and computer readable storage medium

Abstract

The invention provides an air conditioner refrigerant leakage detection method, an air conditioner and a computer readable storage medium, and the air conditioner refrigerant leakage detection method comprises the steps that when the concentration of collected refrigerant gas is larger than the preset leakage concentration P0, an indoor fan is controlled to be closed, and an air inlet and an air outlet are closed, so that an inner cavity forms a sealed cavity; the refrigerant sensor collects the initial refrigerant concentration P1 of the sealing cavity; after the sealing cavity is continuously sealed for a first preset time, the indoor fan is controlled to operate at the minimum rotating speed, and after the indoor fan is controlled to be closed, the refrigerant sensor collects the leaked refrigerant concentration P2 of the sealing cavity; and the refrigerant leakage degree is judged according to at least two pieces of concentration data of the preset leakage concentration P0, the initial refrigerant concentration P1 and the leaked refrigerant concentration P2, and preset operation is executed according to the refrigerant leakage degree. According to the air conditioner refrigerant leakage detection method, the refrigerant leakage degree can be accurately recognized so as to quickly respond and execute intelligent operation processing, the intelligent control degree is improved, and the safety of the air conditioner refrigerant is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a method for detecting leakage of air conditioner refrigerant, an air conditioner for implementing the method, and a computer-readable storage medium. Background Art

[0002] With the tightening of environmental protection policies, the global household air conditioning industry is facing the problem of replacing refrigerants with lower global warming potential (GWP) values. Compared with traditional refrigerants such as R22, R410A, and R134a (also known as "refrigerants"), R290 refrigerant has become a popular environmentally friendly alternative refrigerant with an extremely low GWP value of 3. However, the safety level of R290 refrigerant is A3, which is extremely flammable and explosive. Improving its safety is a technical problem that needs to be solved urgently for its promotion and use.

[0003] Since adjacent pipes of the air conditioner evaporator are connected with U-shaped pipes, there is a risk of refrigerant leakage in the connection area. If the leaked R290 refrigerant is released into the air, it poses a great safety hazard.

[0004] In the related art, a refrigerant sensor is generally set to monitor the refrigerant concentration in the use environment, so as to promptly alarm when the refrigerant concentration in the use environment is too high, thereby avoiding the occurrence of safety accidents such as combustion and explosion caused by refrigerant leakage. However, in the actual monitoring process of the refrigerant sensor, there are errors in the refrigerant sensor's detection of the refrigerant concentration at different leakage locations and different leakage directions, and it is interfered by the operation of the air-conditioning fan, resulting in low detection accuracy and high false detection rate of refrigerant leakage in the actual use environment, and great safety risks. In order to detect different potential leakage points, the existing technology is to arrange multiple sensors at different potential leakage points to avoid risks, but it greatly increases the production cost of the product.

[0005] In addition, the existing air conditioner refrigerant leakage detection method is to monitor the refrigerant concentration in the use environment through the refrigerant sensor. When the refrigerant concentration detected by the refrigerant sensor is greater than the set alarm value, the refrigerant sensor will alarm. However, the existing air conditioner refrigerant leakage detection method cannot accurately identify the degree of refrigerant leakage, and thus cannot perform related intelligent operation processing, which in turn affects the degree of intelligent control. Summary of the invention

[0006] The first object of the present invention is to provide an air conditioning refrigerant leakage detection method that can accurately identify the degree of refrigerant leakage, quickly respond to execute intelligent operation processing, improve the degree of intelligent control, and improve the safety of air conditioning refrigerant.

[0007] A second object of the present invention is to provide an air conditioner that implements the above-mentioned air conditioner refrigerant leakage detection method.

[0008] A third object of the present invention is to provide a computer-readable storage medium for implementing the above-mentioned air conditioning refrigerant leakage detection method.

[0009] In order to achieve the first objective of the present invention, the present invention provides an air-conditioning refrigerant leakage detection method, the air-conditioning includes an indoor unit, the indoor unit includes a casing, a wind shield, an air guide plate, an indoor fan, an evaporator and a refrigerant sensor, the casing is provided with an air inlet and an air outlet, the wind shield can be movably opened or closed the air inlet, the air guide plate can be movably opened or closed the air outlet, the evaporator and the indoor fan are arranged in an inner cavity of the casing, the refrigerant sensor is arranged on the evaporator, the air-conditioning refrigerant leakage detection method includes: the air-conditioning is powered on, the refrigerant sensor collects the refrigerant gas concentration at intervals of a preset period T; when the refrigerant gas concentration collected for at least two consecutive preset periods T is greater than the preset leakage concentration P0, it is judged whether the air-conditioning is turned on and running, such as When the air conditioner is turned on and running, the indoor fan is controlled to be turned off, the wind baffle is controlled to close the air inlet, and the air guide plate is controlled to close the air outlet, so that the inner cavity forms a sealed cavity. At this time, the refrigerant sensor collects the initial refrigerant concentration P1 of the sealed cavity; after the sealed cavity is continuously sealed for the first preset time, the indoor fan is controlled to run at the minimum speed, and other loads of the air conditioner are controlled to be turned off; when the indoor fan runs at the minimum speed for the second preset time, the indoor fan is controlled to be turned off, and then the refrigerant sensor collects the leakage refrigerant concentration P2 of the sealed cavity; the degree of refrigerant leakage is judged according to at least two concentration data among the preset leakage concentration P0, the initial refrigerant concentration P1 and the leakage refrigerant concentration P2, and the preset operation is performed according to the degree of refrigerant leakage.

[0010] A preferred solution is that when |P2-P1|≤ΔP3 and |P2-P0|≤ΔP3 are satisfied, the refrigerant leakage level is determined to be an extremely low refrigerant leakage level, and a preset operation is performed according to the extremely low refrigerant leakage level, and the air conditioner is controlled to resume the original set mode of operation, wherein ΔP3 is the first preset concentration difference.

[0011] A further solution is that when ΔP3<|P2-P1|≤ΔP4 is satisfied, the refrigerant leakage degree is determined to be a trace refrigerant leakage degree, and a preset operation is performed according to the trace refrigerant leakage degree, then the wind shield is controlled to open the air inlet, the air guide plate is controlled to open the air outlet, and the indoor fan is controlled to run at the maximum speed, wherein ΔP4 is the second preset concentration difference.

[0012] A further solution is that when |P2-P1|>ΔP4 is satisfied, the refrigerant leakage degree is determined to be a severe refrigerant leakage degree, and a preset operation is performed according to the severe refrigerant leakage, the air guide plate is controlled to open the air outlet, and the indoor fan is controlled to run at a minimum speed.

[0013] A further solution is to calculate the refrigerant leakage mass M1 = V × (P2-P1), when When , it is determined that the refrigerant leakage level is an extremely low refrigerant leakage level, and the preset operation is performed according to the extremely low refrigerant leakage level, then the air conditioner is controlled to resume the original set mode operation, where V is the preset inner cavity volume, M0 is the preset refrigerant total mass, and m1 is the first preset ratio.

[0014] A further solution is to satisfy When , it is determined that the refrigerant leakage degree is a trace refrigerant leakage degree, and the preset operation is performed according to the trace refrigerant leakage degree, then the wind shield is controlled to open the air inlet, the air guide plate is controlled to open the air outlet, and the indoor fan is controlled to run at the maximum speed, where m2 is the second preset ratio.

[0015] A further solution is to satisfy When the refrigerant leakage degree is determined to be a serious refrigerant leakage degree, a preset operation is performed according to the serious refrigerant leakage, the air guide plate is controlled to open the air outlet, and the indoor fan is controlled to run at the minimum speed.

[0016] A further solution is that after a preset operation is performed based on a serious refrigerant leakage, the refrigerant sensor collects the refrigerant leakage concentration P5. When P5≤P6 is satisfied, the wind shield is controlled to open the air inlet, and the indoor fan is controlled to run at the maximum speed, where P6 is between 5% LFL and 8% LFL.

[0017] A further solution is that a first sealing ring is provided around the wind shield, and the first sealing ring can be sealed against the circumferential surface of the air inlet; and / or, a second sealing ring is provided around the wind guide plate, and the second sealing ring can be sealed against the circumferential surface of the air outlet.

[0018] In order to achieve the second purpose of the present invention, the present invention provides an air conditioner, including an indoor unit and an outdoor unit having a circuit board, the circuit board is provided with a processor and a memory, the memory stores a computer program, and when the computer program is executed by the processor, each step of the above-mentioned air conditioner refrigerant leakage detection method is implemented.

[0019] In order to achieve the third objective of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, each step of the above-mentioned air conditioning refrigerant leakage detection method is implemented.

[0020] The air-conditioning refrigerant leakage detection method of the present invention can accurately judge the degree of refrigerant leakage according to the difference between at least two concentration data among the preset leakage concentration P0, the initial refrigerant concentration P1 and the leakage refrigerant concentration P2, or calculate the refrigerant leakage mass M1=V×(P2-P1) according to at least two concentration data among the preset leakage concentration P0, the initial refrigerant concentration P1 and the leakage refrigerant concentration P2, and accurately judge the refrigerant leakage degree according to the comparison between the refrigerant leakage mass M1 and the preset refrigerant total mass M0, so as to intelligently perform preset operations according to the refrigerant leakage degree, so as to accurately identify the refrigerant leakage degree, and perform intelligent operation processing with rapid response, thereby improving the degree of intelligent control and improving the safety of air-conditioning refrigerant. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a first-view structural diagram of the indoor unit in an air-conditioning embodiment of the present invention.

[0022] Figure 2 It is a second viewing angle structural diagram of the indoor unit in the air-conditioning embodiment of the present invention.

[0023] Figure 3 It is a schematic diagram of the cooperation between the evaporator and the refrigerant sensor in the air conditioner embodiment of the present invention.

[0024] Figure 4 It is a cross-sectional view of an indoor unit in an embodiment of an air conditioner of the present invention.

[0025] Figure 5 It is a flow chart of the first embodiment of the air conditioning refrigerant leakage detection method of the present invention.

[0026] Figure 6 It is a flow chart of the second embodiment of the air conditioning refrigerant leakage detection method of the present invention.

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0028] The first embodiment of the air conditioning refrigerant leakage detection method:

[0029] See also Figures 1 to 4The air conditioner of this embodiment includes an indoor unit 10 and an outdoor unit. The indoor unit 10 includes a casing 111, a wind shield 114, a wind guide plate 112, an indoor fan 120, an evaporator 116 and a refrigerant sensor 117. The casing 111 is provided with an air inlet 118 and an air outlet 119. The wind shield 114 can movably open or close the air inlet 118, and the wind guide plate 112 can movably open or close the air outlet 119. The evaporator 116 and the indoor fan 120 are arranged in the inner cavity 121 of the casing 111. The refrigerant sensor 117 is arranged on the evaporator 116. The refrigerant sensor 117 is used to detect the concentration of the flammable refrigerant. Specifically, the refrigerant sensor 117 of this embodiment can be a NDI R non-spectral infrared principle detection technology or a metal semiconductor oxide gas sensitive principle detection technology. The refrigerant sensor 117 is suitable for R32 refrigerant, R290 refrigerant, etc.

[0030] In order to ensure the sealing of the closure, a first sealing ring 113 is provided around the wind shield 114 of the present embodiment, and the first sealing ring 113 can be sealingly abutted against the circumferential surface of the air inlet 118, thereby ensuring that the wind shield 114 seals and closes the air inlet 118. In addition, a second sealing ring 115 is provided around the wind guide plate 112 of the present embodiment, and the second sealing ring 115 can be sealingly abutted against the circumferential surface of the air outlet 119, thereby ensuring that the wind guide plate 112 seals and closes the air outlet 119, thereby preventing the inner cavity 121 of the casing 111 from communicating with the outside, so that the inner cavity 121 of the casing 111 forms a sealed cavity with good sealing performance.

[0031] See also Figure 5 , Figure 5 is a flow chart of the air-conditioning refrigerant leakage detection method of this embodiment. The specific steps of the air-conditioning refrigerant leakage detection method of this embodiment are as follows.

[0032] First, step S11 is executed. When the air conditioner is powered on, step S12 is executed. The refrigerant sensor 117 collects the refrigerant gas concentration at intervals of a preset period T. Then, step S13 is executed to determine whether the refrigerant gas concentration collected for at least two consecutive preset periods T is greater than the preset leakage concentration P0. If so, step S14 is executed. If not, step S12 is continued to be executed. The refrigerant sensor 117 continues to collect the refrigerant gas concentration at intervals of the preset period T. Specifically, the preset period T in this embodiment is between 0.1 seconds and 5 seconds, and the preset leakage concentration P0 in this embodiment is between 0.1% LFL and 2% LFL. Because the refrigerant leakage may diffuse or the refrigerant sensor 117 is far away from the leakage point, the refrigerant sensor 117 may detect the leaked refrigerant after diffusion and dilution, so the value of the preset leakage concentration P0 is set to be low as a preliminary pre-judgment condition.

[0033] When step S13 is executed to determine that the refrigerant gas concentration collected for at least two consecutive preset cycles T is greater than the preset leakage concentration P0, it indicates that the refrigerant is suspected to be leaking, and step S14 is executed to determine whether the air conditioner is turned on and running. If the air conditioner is turned on and running, step S16 is executed. If it is determined that the air conditioner is not turned on and running, step S15 is executed, and the panel of the air conditioner indoor unit 10 displays the refrigerant leakage fault code, and the indoor unit 10 sends a voice alarm to remind the user.

[0034] When step S14 is executed to determine that the air conditioner is turned on, step S16 is executed to control the indoor fan 120 to be turned off, the wind shield 114 to close the air inlet 118, and the wind guide plate 112 to close the air outlet 119, so that the inner cavity 121 forms a sealed cavity. At this time, the refrigerant sensor 117 collects the initial refrigerant concentration P1 of the sealed cavity.

[0035] Then, step S17 is performed. After the sealed cavity is sealed for the first preset time, the indoor fan 120 is controlled to run at the minimum speed, and other loads of the air conditioner are controlled to be turned off, such as the compressor in the outdoor unit, the outdoor fan and other loads. After the wind shield 114 closes the air inlet 118 and the wind guide plate 112 closes the air outlet 119 so that the inner cavity 121 of the casing 111 forms a sealed cavity, the sealed cavity is kept sealed for the first preset time, so that the refrigerant in the pipeline of the evaporator 116 can be leaked in the sealed cavity without overflowing, and more refrigerant can be accumulated to achieve a more accurate judgment of the refrigerant leakage concentration. Specifically, the first preset time in this embodiment is between 30 seconds and 1 minute.

[0036] Then, step S18 is performed. After the indoor fan 120 runs at the minimum speed for the second preset time, the indoor fan 120 is controlled to be turned off, and then the refrigerant sensor 117 collects the leaked refrigerant concentration P2 of the sealed cavity. The indoor fan 120 runs at the minimum speed for the second preset time, which can mix the uneven refrigerant in the sealed cavity, thereby facilitating accurate detection of the leaked refrigerant concentration P2. Specifically, the second preset time in this embodiment is 3 seconds to 10 seconds.

[0037] Thus, the refrigerant leakage degree is determined according to at least two concentration data among the preset leakage concentration P0, the initial refrigerant concentration P1 and the leaked refrigerant concentration P2, and a preset operation is performed according to the refrigerant leakage degree.

[0038] Specifically, step S19 is executed to determine whether |P2-P1|≤ΔP3 and |P2-P0|≤ΔP3 are satisfied. If satisfied, step S110 is executed. If not satisfied, step S112 is executed. ΔP3 is a first preset concentration difference. Specifically, in this embodiment, the first preset concentration difference ΔP3 is between 2% LFL and 5% LFL.

[0039] When executing step S19 and determining that |P2-P1|≤ΔP3 and |P2-P0|≤ΔP3 are satisfied, it indicates that there is no refrigerant leakage in the sealed cavity or the refrigerant leakage is extremely low and is not enough to cause a safety hazard, then executing step S110 to determine that the refrigerant leakage level is an extremely low refrigerant leakage level, and then executing step S111 to perform a preset operation based on the extremely low refrigerant leakage level, thereby controlling the air conditioner to resume the original set mode of operation.

[0040] When it is determined that |P2-P1|≤ΔP3 and |P2-P0|≤ΔP3 are not satisfied, step S112 is executed to determine whether ΔP3<|P2-P1|≤ΔP4 is satisfied. If satisfied, step S113 is executed; if not satisfied, step S115 is executed. ΔP4 is a second preset concentration difference. Specifically, in this embodiment, the second preset concentration difference ΔP4 is between 30% LFL and 40% LFL.

[0041] When executing step S112 and judging that ΔP3<|P2-P1|≤ΔP4 is satisfied, it indicates that there is a trace leakage of refrigerant and there is a safety hazard, then executing step S113 to determine that the degree of refrigerant leakage is a trace leakage degree of refrigerant, and then executing step S114 to perform a preset operation according to the degree of trace refrigerant leakage, then controlling the wind shield 114 to open the air inlet 118, controlling the air guide plate 112 to open the air outlet 119, and controlling the indoor fan 120 to run at the maximum speed, so that the leaked refrigerant quickly diffuses into the air. In addition, the panel of the air-conditioning indoor unit 10 can display the refrigerant leakage fault code, and the indoor unit 10 can also issue a voice alarm, such as "The refrigerant leakage is serious, please open the doors and windows of the room to keep ventilation", to remind the user to open the doors and windows of the room to keep ventilation, so as to avoid excessive concentration of leaked refrigerant in the shell cavity 121 and cause safety hazards.

[0042] When it is determined that ΔP3<|P2-P1|≤ΔP4 is not satisfied, step S115 is executed to determine whether |P2-P1|>ΔP4 is satisfied. If so, step S116 is executed. If not, step S12 is executed and the refrigerant sensor 117 continues to collect the refrigerant gas concentration at preset period T intervals.

[0043] When executing step S115 and judging that |P2-P1|>ΔP4 is satisfied, it indicates a serious refrigerant leakage, then executing step S116 to determine that the refrigerant leakage degree is a serious refrigerant leakage degree, and then executing step S117 to perform a preset operation according to the serious refrigerant leakage, then controlling the air guide plate 112 to open the air outlet 119, and controlling the indoor fan 120 to run at the minimum speed, so that the large concentration of leaked refrigerant in the shell cavity 121 is slowly released into the air. In addition, the panel of the air conditioner indoor unit 10 can display the refrigerant leakage fault code, and the indoor unit 10 can also issue a voice alarm, such as "The refrigerant leakage is serious, please open the room doors and windows to keep ventilation." If the air conditioner is connected to the network and has a distribution network, the air conditioner refrigerant leakage information can be sent to the after-sales service, so that the after-sales staff can come to the door to handle it in time.

[0044] After the preset operation is performed according to the serious refrigerant leakage, step S118 is executed, and the refrigerant sensor 117 collects the refrigerant leakage concentration P5. Then step S119 is executed to determine whether P5≤P6 is satisfied. If so, step S120 is executed. If not, step S118 is continued to be executed, and the refrigerant sensor 117 continues to collect the refrigerant leakage concentration P5.

[0045] When step S119 is executed and it is determined that P5≤P6 is satisfied, step S120 is executed to control the wind shield 114 to open the air inlet 118 and control the indoor fan 120 to run at the maximum speed so that the leaked refrigerant is quickly diffused into the air. In this embodiment, P6 is between 5% LFL and 8% LFL.

[0046] Therefore, the air conditioning refrigerant leakage detection method of this embodiment can accurately judge the degree of refrigerant leakage according to the difference between at least two concentration data among the preset leakage concentration P0, the initial refrigerant concentration P1 and the leakage refrigerant concentration P2, and intelligently perform preset operations according to the degree of refrigerant leakage, so as to accurately identify the degree of refrigerant leakage, and perform intelligent operation processing with rapid response, thereby improving the degree of intelligent control and improving the safety of air conditioning refrigerant.

[0047] Second embodiment of the air conditioning refrigerant leakage detection method:

[0048] See also Figure 6 , Figure 6 is a flow chart of the air-conditioning refrigerant leakage detection method of this embodiment. The specific steps of the air-conditioning refrigerant leakage detection method of this embodiment are as follows.

[0049] First, step S21 is executed. When the air conditioner is powered on, step S22 is executed. The refrigerant sensor 117 collects the refrigerant gas concentration at intervals of a preset period T. Then, step S23 is executed to determine whether the refrigerant gas concentration collected for at least two consecutive preset periods T is greater than the preset leakage concentration P0. If so, step S24 is executed. If not, step S22 is continued to be executed. The refrigerant sensor 117 continues to collect the refrigerant gas concentration at intervals of the preset period T. Specifically, the preset period T in this embodiment is between 0.1 seconds and 5 seconds, and the preset leakage concentration P0 in this embodiment is between 0.1% LFL and 2% LFL. Because the refrigerant leakage may diffuse or the refrigerant sensor 117 is far away from the leakage point, the refrigerant sensor 117 may detect the leaked refrigerant after diffusion and dilution, so the value of the preset leakage concentration P0 is set to be low as a preliminary pre-judgment condition.

[0050] When step S23 is executed to determine that the refrigerant gas concentration collected for at least two consecutive preset cycles T is greater than the preset leakage concentration P0, it indicates that the refrigerant is suspected to be leaking, and step S24 is executed to determine whether the air conditioner is turned on and running. If the air conditioner is turned on and running, step S26 is executed. If it is determined that the air conditioner is not turned on and running, step S25 is executed, and the panel of the air conditioner indoor unit 10 displays the refrigerant leakage fault code, and the indoor unit 10 sends a voice alarm to remind the user.

[0051] When step S24 is executed to determine that the air conditioner is turned on, step S26 is executed to control the indoor fan 120 to be turned off, the wind shield 114 to close the air inlet 118, and the wind guide plate 112 to close the air outlet 119, so that the inner cavity 121 forms a sealed cavity. At this time, the refrigerant sensor 117 collects the initial refrigerant concentration P1 of the sealed cavity.

[0052] Then, step S27 is performed. After the sealed cavity is sealed for the first preset time, the indoor fan 120 is controlled to run at the minimum speed, and other loads of the air conditioner are controlled to be turned off, such as the compressor in the outdoor unit, the outdoor fan and other loads. After the wind shield 114 closes the air inlet 118 and the wind guide plate 112 closes the air outlet 119 so that the inner cavity 121 of the casing 111 forms a sealed cavity, the sealed cavity is kept sealed for the first preset time, so that the refrigerant in the pipeline of the evaporator 116 can be leaked in the sealed cavity without overflowing, and more refrigerant can be accumulated to achieve a more accurate judgment of the refrigerant leakage concentration. Specifically, the first preset time in this embodiment is between 30 seconds and 1 minute.

[0053] Then, step S28 is performed. After the indoor fan 120 runs at the minimum speed for the second preset time, the indoor fan 120 is controlled to be turned off, and then the refrigerant sensor 117 collects the leaked refrigerant concentration P2 of the sealed cavity. The indoor fan 120 runs at the minimum speed for the second preset time, which can mix the uneven refrigerant in the sealed cavity, thereby facilitating accurate detection of the leaked refrigerant concentration P2. Specifically, the second preset time in this embodiment is 3 seconds to 10 seconds.

[0054] Thus, the refrigerant leakage degree is determined according to at least two concentration data among the preset leakage concentration P0, the initial refrigerant concentration P1 and the leaked refrigerant concentration P2, and a preset operation is performed according to the refrigerant leakage degree.

[0055] Specifically, step S29 is executed to calculate the refrigerant leakage mass M1=V×(P2-P1), where V is the preset volume of the inner cavity 121. Then, step S210 is executed to determine whether If satisfied, step S211 is executed, if not satisfied, step S213 is executed. Wherein, M0 is the preset total mass of the refrigerant, and m1 is the first preset ratio. Specifically, in this embodiment, the first preset ratio m1 is between 0.0001 and 0.02.

[0056] When step S210 is executed and it is determined that , it indicates that there is no refrigerant leakage in the sealed cavity or the refrigerant leakage is very low and is not enough to cause a safety hazard, then step S211 is executed to determine that the refrigerant leakage level is an extremely low refrigerant leakage level, and then step S212 is executed to perform a preset operation according to the extremely low refrigerant leakage level, and the air conditioner is controlled to resume the original set mode of operation.

[0057] When judgment is not satisfied , then execute step S213 to determine whether If the condition is satisfied, step S214 is executed, and if not, step S216 is executed. Wherein, m2 is a second preset ratio. Specifically, in this embodiment, the second preset ratio m2 is between 0.03 and 0.05.

[0058] When step S213 is executed and it is determined that , indicating a trace refrigerant leakage and a potential safety hazard, step S214 is executed to determine that the refrigerant leakage degree is a trace refrigerant leakage degree, and then step S215 is executed to perform a preset operation according to the trace refrigerant leakage degree, then the wind shield 114 is controlled to open the air inlet 118, and the air guide plate 112 is controlled to open the air outlet 119, and the indoor fan 120 is controlled to run at the maximum speed, so that the leaked refrigerant quickly diffuses into the air. In addition, the panel of the air-conditioning indoor unit 10 can display the refrigerant leakage fault code, and the indoor unit 10 can also issue a voice alarm, such as "The refrigerant leakage is serious, please open the doors and windows of the room to keep ventilation", to remind the user to open the doors and windows of the room to keep ventilation, so as to avoid excessive concentration of leaked refrigerant in the inner cavity 121 of the shell and cause safety hazards.

[0059] When judgment is not satisfied , then execute step S216 to determine whether If the conditions are satisfied, step S217 is executed. If not, step S22 is executed, and the refrigerant sensor 117 continues to collect the refrigerant gas concentration at intervals of a preset period T.

[0060] When step S216 is executed and it is determined that , indicating a serious refrigerant leakage, then step S217 is executed to determine that the refrigerant leakage degree is a serious refrigerant leakage degree, and then step S218 is executed to perform a preset operation according to the serious refrigerant leakage, then the air guide plate 112 is controlled to open the air outlet 119, and the indoor fan 120 is controlled to run at the minimum speed, so that the large concentration of leaked refrigerant in the shell cavity 121 is slowly released into the air. In addition, the panel of the air conditioner indoor unit 10 can display the refrigerant leakage fault code, and the indoor unit 10 can also issue a voice alarm, such as "The refrigerant leakage is serious, please open the doors and windows of the room to keep ventilation." If the air conditioner is connected to the network and has a distribution network, the air conditioner refrigerant leakage information can be sent to the after-sales service, so that the after-sales staff can come to the door to handle it in time.

[0061] After the preset operation is performed according to the serious refrigerant leakage, step S219 is executed, and the refrigerant sensor 117 collects the refrigerant leakage concentration P5. Then step S220 is executed to determine whether P5≤P6 is satisfied. If so, step S221 is executed. If not, step S219 is continued to be executed, and the refrigerant sensor 117 continues to collect the refrigerant leakage concentration P5.

[0062] When step S220 is executed to determine that P5≤P6 is satisfied, step S221 is executed to control the wind shield 114 to open the air inlet 118 and control the indoor fan 120 to run at the maximum speed so that the leaked refrigerant quickly diffuses into the air. In this embodiment, P6 is between 5% LFL and 8% LFL.

[0063] Therefore, the air-conditioning refrigerant leakage detection method of this embodiment can calculate the refrigerant leakage mass M1=V×(P2-P1) according to at least two concentration data among the preset leakage concentration P0, the initial refrigerant concentration P1 and the leakage refrigerant concentration P2, and accurately judge the degree of refrigerant leakage by comparing the refrigerant leakage mass M1 with the preset refrigerant total mass M0, and intelligently perform preset operations according to the degree of refrigerant leakage, so as to accurately identify the degree of refrigerant leakage, and perform intelligent operation processing with rapid response, thereby improving the degree of intelligent control and improving the safety of air-conditioning refrigerant.

[0064] Air conditioning example:

[0065] The air conditioner in this embodiment includes an indoor unit 10 and an outdoor unit having a circuit board. The circuit board is provided with a processor and a memory. The memory stores a computer program that can be run on the processor, and when the processor executes the computer program, each step of the above-mentioned air conditioner refrigerant leakage detection method is implemented.

[0066] For example, a computer program can be divided into one or more modules, one or more modules are stored in a memory and executed by a processor to complete each module of the present invention. One or more modules can be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device.

[0067] The processor referred to in the present invention may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the electrical appliance, and uses various interfaces and lines to connect various parts of the entire electrical appliance.

[0068] The memory can be used to store computer programs and / or modules. The processor realizes various functions of the appliance by running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the appliance, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Med iaCard, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0069] Computer readable storage medium embodiment:

[0070] If the computer program stored in the memory of the air conditioner is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, each step of the above-mentioned air conditioner refrigerant leakage detection method can be implemented.

[0071] Among them, the computer program includes computer program code, which can be in source code form, object code form, executable file or some intermediate form, etc. Computer readable media may include: any entity or device that can carry computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer readable media does not include electric carrier signals and telecommunication signals.

[0072] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles of the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A method for detecting refrigerant leakage of an air conditioner, wherein the air conditioner comprises an indoor unit, the indoor unit comprises a casing, a wind shield, an air guide plate, an indoor fan, an evaporator and a refrigerant sensor, the casing is provided with an air inlet and an air outlet, the wind shield can be moved to open or close the air inlet, the air guide plate can be moved to open or close the air outlet, the evaporator and the indoor fan are arranged in an inner cavity of the casing, the refrigerant sensor is arranged on the evaporator, and the method is characterized in that: The air conditioning refrigerant leakage detection method comprises: When the air conditioner is powered on, the refrigerant sensor collects the refrigerant gas concentration at a preset period T interval; When the refrigerant gas concentration collected for at least two consecutive preset cycles T is greater than the preset leakage concentration P0, it is determined whether the air conditioner is turned on and running. If the air conditioner is turned on and running, the indoor fan is controlled to be turned off, the wind shield is controlled to close the air inlet, and the air guide plate is controlled to close the air outlet, so that the inner cavity forms a sealed cavity. At this time, the refrigerant sensor collects the initial refrigerant concentration P1 of the sealed cavity; After the sealed cavity is continuously sealed for a first preset time, the indoor fan is controlled to run at a minimum speed, and other loads of the air conditioner are controlled to be turned off; after the indoor fan runs at the minimum speed for a second preset time, the indoor fan is controlled to be turned off, and then the refrigerant sensor collects the leakage refrigerant concentration P2 of the sealed cavity; The refrigerant leakage degree is determined according to at least two concentration data among the preset leakage concentration P0, the initial refrigerant concentration P1 and the leaked refrigerant concentration P2, and a preset operation is performed according to the refrigerant leakage degree.

2. The air conditioning refrigerant leakage detection method according to claim 1, characterized in that: When |P2-P1|≤ΔP3 and |P2-P0|≤ΔP3 are satisfied, the refrigerant leakage level is determined to be an extremely low refrigerant leakage level, and the preset operation is performed according to the extremely low refrigerant leakage level, and the air conditioner is controlled to resume the original set mode of operation, wherein ΔP3 is the first preset concentration difference.

3. The air conditioning refrigerant leakage detection method according to claim 2, characterized in that: When ΔP3<|P2-P1|≤ΔP4 is satisfied, the refrigerant leakage degree is determined to be a trace refrigerant leakage degree, and the preset operation is performed according to the trace refrigerant leakage degree, then the wind shield is controlled to open the air inlet, the air guide plate is controlled to open the air outlet, and the indoor fan is controlled to run at the maximum speed, wherein ΔP4 is the second preset concentration difference.

4. The air conditioning refrigerant leakage detection method according to claim 3, characterized in that: When |P2-P1|>ΔP4 is satisfied, the refrigerant leakage degree is determined to be a severe refrigerant leakage degree, and the preset operation is performed according to the severe refrigerant leakage, the air guide plate is controlled to open the air outlet, and the indoor fan is controlled to operate at a minimum speed.

5. The air conditioning refrigerant leakage detection method according to claim 1, characterized in that: Calculate the refrigerant leakage mass M1 = V × (P2-P1), when it meets , it is determined that the refrigerant leakage level is an extremely low refrigerant leakage level, and the preset operation is performed according to the extremely low refrigerant leakage level, then the air conditioner is controlled to resume the original set mode of operation, wherein V is the preset inner cavity volume, M0 is the preset total refrigerant mass, and m1 is the first preset ratio.

6. The air conditioning refrigerant leakage detection method according to claim 5, characterized in that: When satisfied When , it is determined that the refrigerant leakage degree is a trace refrigerant leakage degree, and the preset operation is performed according to the trace refrigerant leakage degree, then the wind shield is controlled to open the air inlet, and the air guide plate is controlled to open the air outlet, and the indoor fan is controlled to run at the maximum speed, wherein m2 is the second preset ratio.

7. The air conditioning refrigerant leakage detection method according to claim 6, characterized in that: When satisfied When the refrigerant leakage degree is determined to be a serious refrigerant leakage degree, the preset operation is performed according to the serious refrigerant leakage, the air guide plate is controlled to open the air outlet, and the indoor fan is controlled to run at a minimum speed.

8. The air conditioning refrigerant leakage detection method according to claim 4 or 7, characterized in that: After the preset operation is performed according to the serious refrigerant leakage, the refrigerant sensor collects the refrigerant leakage concentration P5. When P5≤P6 is satisfied, the wind shield is controlled to open the air inlet, and the indoor fan is controlled to run at the maximum speed, wherein P6 is between 5% LFL and 8% LFL.

9. The air conditioning refrigerant leakage detection method according to any one of claims 1 to 7, characterized in that: A first sealing ring is arranged around the windshield, and the first sealing ring can be sealed against the circumferential surface of the air inlet; And / or, a second sealing ring is provided at the periphery of the air guide plate, and the second sealing ring can be sealingly abutted against the circumferential surface of the air outlet.

10. An air conditioner, characterized in that It includes an indoor unit and an outdoor unit having a circuit board, wherein the circuit board is provided with a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, each step of the air conditioning refrigerant leakage detection method described in any one of claims 1 to 9 is implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, each step of the air conditioning refrigerant leakage detection method described in any one of claims 1 to 9 is implemented.

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