CN105805903A - Air conditioner and its anti-leakage control method - Google Patents

Abstract

The invention discloses an air conditioner and a leakage-proof control method thereof, the air conditioner comprises a refrigerant working loop which is formed by connecting a compressor, a first heat exchanger and a second heat exchanger end to end in sequence, the air conditioner also comprises a first flow instrument, a second flow instrument, a controller and a refrigerant recovery pipeline, the first flow meter and the second flow meter are arranged at different positions of the refrigerant working circuit and are used for detecting the refrigerant flow at different positions of the refrigerant working circuit, the refrigerant recovery pipeline is connected with the refrigerant output end of the compressor, the controller is used for judging whether the refrigerant leaks or not according to the refrigerant flow difference value of different positions of the refrigerant working circuit, the refrigerant working circuit, the refrigerant recovery pipeline and the compressor are controlled to work, and the refrigerant leakage in the air conditioner is effectively monitored.

Description

Air conditioner and its anti-leakage control method

technical field

The invention relates to the technical field of air conditioners, in particular to an air conditioner and its anti-leakage control method.

Background technique

With the improvement of people's living standards, the popularity of air conditioners is getting higher and higher. Facing the large-scale popularization of air conditioners, the maintenance of air conditioners has become correspondingly frequent. There are endless problems with various air conditioners on the market. There is still no reasonable solution to the refrigerant leakage problem of the air conditioner. Now various leakages have appeared in the market, such as welding leakage of the evaporator of the internal unit, leakage of the connecting pipe, leakage of the condenser of the external unit, and four-way valve. Leaks caused by broken pipes, etc., once a leak occurs, the user usually finds out and repairs it when the cooling and heating effect of the air conditioner becomes extremely poor, and the maintenance is usually just adding refrigerant. As far as air conditioners with leaks are concerned, refrigerant leakage will soon lead to insufficient or no cooling capacity. Therefore, how to prevent air conditioners from leaking in advance has become one of the problems to be solved in this field.

Contents of the invention

The main purpose of the present invention is to provide an air conditioner and its anti-leakage control method, aiming to solve the problem that the current air conditioner cannot effectively detect the leakage of refrigerant.

In order to achieve the above-mentioned technical purpose, the present invention provides an air conditioner, including a refrigerant working circuit composed of at least a compressor, a first heat exchanger and a second heat exchanger connected in sequence, and the air conditioner also includes a first A flow meter, a second flow meter, a controller, and a refrigerant recovery pipeline, the first flow meter and the second flow meter are arranged at different positions of the refrigerant working circuit to detect differences in the refrigerant working circuit The refrigerant flow rate at the location, the refrigerant recovery pipeline is connected to the refrigerant output end of the compressor, and the controller works with the first flow meter, the second flow meter, the compressor, and the refrigerant The control valve in the circuit is electrically connected with the control valve of the refrigerant recovery pipeline, and is used to judge whether the refrigerant leaks according to the refrigerant flow difference at different positions of the refrigerant working circuit, so as to control the refrigerant working circuit, all The refrigerant recovery pipeline and the compressor work.

Preferably, the first flow meter and the second flow meter are arranged in the pipeline between the compressor and the first heat exchanger, and the first flow meter is arranged close to the compressor , the second flow meter is set close to the first heat exchanger.

Preferably, the controller is used to determine refrigerant leakage after at least one of the following conditions occurs:

When the difference between the refrigerant flow value detected by the first flow meter and the refrigerant flow value detected by the second flow meter exceeds a first threshold;

When the difference between the refrigerant flow values detected twice before and after the first flowmeter exceeds the second threshold;

When the difference between the two refrigerant flow values detected by the second flow meter before and after it exceeds the third threshold;

When the difference between the refrigerant flow value currently detected by the first flow meter and the refrigerant flow value detected by the first flow meter for the first time exceeds a fourth threshold; and,

When the difference between the currently detected refrigerant flow value of the second flow meter and the refrigerant flow value detected by the second flow meter for the first time exceeds the fifth threshold.

Preferably, the flow detection device further includes a third flow meter and a fourth flow meter, the third flow meter and the fourth flow meter are arranged between the compressor and the second heat exchanger In the pipeline, the fourth flow meter is set close to the compressor, and the third flow meter is set close to the second heat exchanger.

Preferably, the controller is also used to determine refrigerant leakage when at least one of the following conditions occurs:

When the difference between the refrigerant flow value detected by the third flow meter and the refrigerant flow value detected by the fourth flow meter exceeds a first threshold;

When the difference between the two refrigerant flow values detected by the third flowmeter before and after exceeds the second threshold;

When the difference between the refrigerant flow values detected twice before and after the fourth flowmeter exceeds the third threshold;

When the difference between the refrigerant flow value currently detected by the third flow meter and the refrigerant flow value detected by the third flow meter for the first time exceeds a fourth threshold; and,

When the difference between the refrigerant flow value currently detected by the fourth flow meter and the refrigerant flow value detected by the fourth flow meter for the first time exceeds the fifth threshold.

In order to achieve the above-mentioned technical purpose, the present invention also provides an anti-leakage control method of an air conditioner, which includes the following steps:

Detecting the flow of refrigerant in at least two different positions of the refrigerant working circuit;

Judging whether the refrigerant leaks according to the refrigerant flow difference at different positions of the refrigerant working circuit;

According to the judgment result, the refrigerant working circuit, the refrigerant recovery pipeline and the compressor are controlled.

Preferably, the step of detecting the refrigerant flow in at least two different positions of the refrigerant working circuit includes:

The first flowmeter detects the refrigerant flow rate at the end of the compressor connected to the first heat exchanger;

The second flowmeter detects the refrigerant flow rate at the end of the first heat exchanger connected to the compressor.

Preferably, the step of judging whether the refrigerant leaks according to the refrigerant flow difference at different positions of the refrigerant working circuit includes:

When the refrigerant flow value detected by the first flowmeter and the refrigerant flow value detected by the second flowmeter meet at least one of the following conditions, it is determined that the refrigerant is leaking:

When the difference between the refrigerant flow value detected by the first flow meter and the refrigerant flow value detected by the second flow meter exceeds a first threshold;

When the difference between the two refrigerant flow values detected by the first flow meter before and after exceeds the second threshold;

When the difference between the refrigerant flow values detected twice before and after the second flowmeter exceeds the third threshold;

When the difference between the refrigerant flow value currently detected by the first flow meter and the refrigerant flow value detected by the first flow meter for the first time exceeds a fourth threshold; and,

When the difference between the currently detected refrigerant flow value of the second flow meter and the refrigerant flow value detected by the second flow meter for the first time exceeds the fifth threshold.

Preferably, the step of detecting the refrigerant flow of the refrigerant working circuit further includes:

The third flow meter detects the refrigerant flow rate at the end of the second heat exchanger connected to the compressor;

The fourth flowmeter detects the refrigerant flow rate at the end of the compressor connected to the second heat exchanger.

Preferably, the step of judging whether the refrigerant leaks according to the refrigerant flow difference at different positions of the refrigerant working circuit further includes:

When the refrigerant flow value detected by the third flowmeter and the refrigerant flow value detected by the fourth flowmeter meet at least one of the following conditions, it is determined that the refrigerant is leaking:

When the difference between the refrigerant flow value detected by the third flow meter and the refrigerant flow value detected by the fourth flow meter exceeds a first threshold;

When the difference between the two refrigerant flow values detected by the third flowmeter before and after exceeds the second threshold;

When the difference between the refrigerant flow values detected twice before and after the fourth flowmeter exceeds the third threshold;

When the difference between the refrigerant flow value currently detected by the third flow meter and the refrigerant flow value detected by the third flow meter for the first time exceeds a fourth threshold; and,

When the difference between the refrigerant flow value currently detected by the fourth flow meter and the refrigerant flow value detected by the fourth flow meter for the first time exceeds the fifth threshold.

The air conditioner and its anti-leakage control method provided by the present invention, the air conditioner includes at least a refrigerant working circuit composed of a compressor, a first heat exchanger and a second heat exchanger connected in sequence from end to end, and the air conditioner also includes The first flow meter, the second flow meter, the controller and the refrigerant recovery pipeline, the first flow meter and the second flow meter are arranged at different positions of the refrigerant working circuit to detect the refrigerant working circuit The refrigerant flow rate at different locations, the refrigerant recovery pipeline is connected to the refrigerant output end of the compressor, the controller is connected to the first flow meter, the second flow meter, the compressor, the The control valve in the refrigerant working circuit is electrically connected to the control valve of the refrigerant recovery pipeline, and is used to judge whether the refrigerant leaks according to the refrigerant flow difference at different positions of the refrigerant working circuit, so as to control the refrigerant working circuit , the refrigerant recovery pipeline and the compressor work, and the controller judges whether the refrigerant in the air conditioner leaks according to the change of the flow value at different positions of the refrigerant working circuit, so as to control the air conditioner The leakage of refrigerant in the system can be effectively monitored.

Description of drawings

Fig. 1 is the structural representation of an embodiment of the air conditioner provided by the present invention;

Fig. 2 is the structural representation of another embodiment of the air conditioner provided by the present invention;

Fig. 3 is the flowchart of an embodiment of the anti-leakage control method of the air conditioner provided by the present invention;

FIG. 4 is a specific flow chart of the anti-leakage control method of the air conditioner provided in FIG. 3 .

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The present invention provides an air conditioner. Figure 1 is an embodiment of the air conditioner provided by the present invention. In this embodiment, the air conditioner is a single-system air conditioner. air conditioner.

Please refer to FIG. 1 , the air conditioner includes a refrigerant working circuit 1 at least composed of a compressor 11 , a first heat exchanger 12 , a throttling device 13 , and a second heat exchanger 14 connected in sequence from end to end. The air conditioner also includes a first flow meter 31 and a second flow meter 32, a controller (not shown) and a refrigerant recovery pipeline 2, the first flow meter 31 and the second flow meter 32 are arranged on the Different positions of the refrigerant working circuit 1 are used to detect the refrigerant flow rate at different positions of the refrigerant working circuit 1, the refrigerant recovery pipeline 2 is connected to the refrigerant output end of the compressor 11, the controller is connected to the The first flow rate 31 is electrically connected with the second flow meter 32, the compressor 11, the control valve 15 in the refrigerant working circuit 1, and the control valve 23 of the refrigerant recovery pipeline 2 to detect The refrigerant flow rate at different positions of the refrigerant working circuit 1 is used to control the operation of the refrigerant working circuit 1, the refrigerant recovery pipeline 2 and the compressor 11, and by detecting the difference in the refrigerant working circuit 1 of the air conditioner The refrigerant flow difference of the location can be used to judge whether the refrigerant leaks, so as to effectively monitor the refrigerant leakage in the air conditioner.

Specifically, in this embodiment, the refrigerant recovery pipeline 2 includes a refrigerant recovery device 21 , a restrictor 22 and the refrigerant recovery device 21 arranged between the refrigerant output end of the compressor 11 and the The control valve 23 of the refrigerant recovery pipeline is described above.

Specifically, in this embodiment, the controller is used to control the disconnection of the refrigerant working circuit 1 by closing the control valve 15 of the refrigerant working circuit when it is determined that the refrigerant is leaking, and to control the disconnection of the refrigerant working circuit 1 by opening the refrigerant recovery pipe. The control valve 23 of the circuit controls the connection between the refrigerant recovery pipeline 2 and the refrigerant output end of the compressor 11 for refrigerant recovery, and controls the compressor 11 to stop after the refrigerant recovery is completed. The controller is also used to control the conduction of the refrigerant working circuit 1 by opening the control valve 15 of the refrigerant working circuit when it is determined that the refrigerant is not leaking, and to control the conduction of the refrigerant working circuit 1 by closing the control valve 23 of the refrigerant recovery pipeline to The refrigerant recovery pipeline 2 is controlled to be disconnected from the refrigerant output end of the compressor 11, and the compressor 11 operates normally.

In this embodiment, the air conditioner further includes an alarm device (not shown), the alarm device is electrically connected to the controller, and the controller is also used to control the alarm device after it is determined that the refrigerant leaks A refrigerant leakage fault alarm is issued. The alarm device can be an audio alarm device or/and a communication alarm device connected to the user's communication device by telecommunication, so that the user can be notified in time when the air conditioner leaks refrigerant.

In this embodiment, the first flow meter 31 and the second flow meter 32 are arranged in the pipeline between the compressor 11 and the first heat exchanger 12, and the first flow The meter 31 is set close to the compressor 11 , and the second flow meter 32 is set close to the first heat exchanger 12 . In this embodiment, the first heat exchanger 12 is an indoor heat exchanger, and the second heat exchanger 14 is an outdoor heat exchanger. Correspondingly, the first flow meter 31 detects that the compressor 11 The refrigerant flow rate at the refrigerant output end, the second flow meter 32 detects the refrigerant flow rate at the input end of the indoor heat exchanger, obviously, the present design is not limited thereto, and the second heat exchanger 14 can also be an indoor heat exchanger, so The first heat exchanger 12 can be an outdoor heat exchanger. Correspondingly, the first flowmeter 31 detects the refrigerant flow rate at the refrigerant recovery end of the compressor 11, and the second flowmeter 32 is used to detect the flow rate of the outdoor heat exchanger. Refrigerant flow at the output of the device.

In this embodiment, the controller is used to judge refrigerant leakage when at least one of the following conditions occurs:

When the difference between the refrigerant flow value detected by the first flow meter 31 and the refrigerant flow value detected by the second flow meter 32 exceeds a first threshold;

When the difference between the refrigerant flow values detected twice before and after by the first flowmeter 31 exceeds the second threshold;

When the difference between the refrigerant flow values detected twice before and after by the second flow meter 32 exceeds the third threshold;

When the difference between the refrigerant flow value currently detected by the first flow meter 31 and the refrigerant flow value detected by the first flow meter 31 for the first time exceeds a fourth threshold; and,

When the difference between the currently detected refrigerant flow value of the second flow meter 32 and the refrigerant flow value detected by the second flow meter 32 for the first time exceeds the fifth threshold.

In addition, in order to strengthen the detection of the refrigerant working circuit 1, the flow detection device further includes a third flow meter 33 and a fourth flow meter 34, and the third flow meter 33 and the fourth flow meter 34 are located at In the pipeline between the compressor 11 and the second heat exchanger 14, and the fourth flow meter 34 is set close to the compressor 11, and the third flow meter 33 is close to the second heat exchanger The heater 14 is provided, and the controller is electrically connected with the third flow meter 33 and the fourth flow meter 34 .

In this embodiment, the first heat exchanger 12 is an indoor heat exchanger, and the second heat exchanger 14 is an outdoor heat exchanger. Correspondingly, the fourth flow meter 34 detects that the compressor 11 The refrigerant flow rate at the refrigerant recovery end, the third flow meter 33 is used to detect the refrigerant flow rate at the output end of the outdoor heat exchanger, obviously, this design is not limited thereto, and the second heat exchanger 14 can also be an indoor heat exchanger , the first heat exchanger 12 can be an outdoor heat exchanger, and correspondingly, the fourth flowmeter 34 detects the refrigerant flow rate at the refrigerant output end of the compressor 11, and the third flowmeter 33 is used to detect the indoor The refrigerant flow rate at the input end of the heat exchanger.

In this embodiment, the controller is also used to judge refrigerant leakage when at least one of the following conditions occurs:

When the difference between the refrigerant flow value detected by the third flow meter 33 and the refrigerant flow value detected by the fourth flow meter 34 exceeds the first threshold;

When the difference between the refrigerant flow values detected twice before and after by the third flow meter 33 exceeds the second threshold;

When the difference between the refrigerant flow values detected twice before and after by the fourth flow meter 34 exceeds the third threshold;

When the difference between the refrigerant flow value currently detected by the third flow meter 33 and the refrigerant flow value detected by the third flow meter 33 for the first time exceeds a fourth threshold; and,

When the difference between the refrigerant flow value currently detected by the fourth flowmeter 34 and the refrigerant flow value detected by the fourth flowmeter 34 for the first time exceeds a fifth threshold, the controller determines that the refrigerant is leaking.

Please refer to Fig. 2, define that the pipeline that described first heat exchanger 12 is connected with described compressor 11 is the first connecting pipe (unlabeled), and the pipeline that described second heat exchanger 14 is connected with described compressor 11 The pipeline is a second connecting pipe (not labeled), and the two ends of the refrigerant recovery pipeline 2 are correspondingly connected to the two ends of the compressor 11. The refrigerant recovery pipeline 2 includes the refrigerant recovery device 21, a device The first restrictor 22 and the first control valve 23 in the pipeline between the refrigerant recovery device 21 and the compressor 11 , the valve between the refrigerant recovery device 21 and the compressor 11 The second restrictor 24 and the second control valve 25 in the pipeline, the first control valve 23 and the second control valve 25 are in the normally closed state, and the refrigerant working circuit 1 is in the normally open state The third control valve 15 and the fourth control valve 16, the third control valve 15 is arranged between the node between the refrigerant recovery pipeline 2 and the first connecting pipe and the first heat exchanger 12 Between, the fourth control valve 16 is arranged between the node between the refrigerant recovery pipeline 2 and the second connecting pipe and the second heat exchanger 14, the first control valve 23, the The second control valve 25, the third control valve 15 and the fourth control valve 16 are electrically connected to the controller, and the controller controls the first control valve 23, the second control valve The valve 25 , the third control valve 15 and the fourth control valve 16 are used to control the on-off of the refrigerant working circuit 1 and the refrigerant recovery pipeline 2 .

In addition, in this embodiment, the heat exchanger connected to the refrigerant output end of the compressor 11 is defined as the first heat exchanger 12, and the heat exchanger connected to the refrigerant recovery end of the compressor 11 is defined as the second heat exchanger. Heat exchanger 14. Therefore, for a dual-system air conditioner, the first heat exchanger 12 and the second heat exchanger 14 are different in heating mode and cooling mode:

When the air conditioner is in the cooling state, the first heat exchanger 12 is an indoor heat exchanger of the air conditioner, and the second heat exchanger 14 is an outdoor heat exchanger of the air conditioner. Accordingly, the The flow rate detected by the first flow meter 31 is the refrigerant flow rate at the refrigerant output end of the compressor 11, the flow rate detected by the second flow meter 32 is the refrigerant flow rate at the input end of the indoor heat exchanger, and the third flow rate The flow rate detected by the meter 33 is the refrigerant flow rate at the output end of the outdoor heat exchanger, and the flow rate detected by the fourth flow meter 34 is the refrigerant flow rate at the refrigerant recovery end of the compressor 11 .

Taking the first threshold value, the second threshold value, the third threshold value, the fourth threshold value as 5%, and the fifth threshold value as 50% as an example, the leakage prevention process of the dual-system air conditioner in cooling mode will be described in detail below:

When the air conditioner is in cooling operation, the indoor heat exchanger is connected to the refrigerant output end of the compressor 11, and the outdoor heat exchanger is connected to the refrigerant recovery end of the compressor 11. At this time, by definition, the The first heat exchanger 12 is an indoor heat exchanger, and the second heat exchanger 14 is an outdoor heat exchanger. Correspondingly, the flow rate detected by the first flowmeter 31 is the flow rate of the refrigerant output end of the compressor 11. refrigerant flow rate, the flow rate detected by the second flow meter 32 is the refrigerant flow rate at the input end of the indoor heat exchanger, and the flow rate detected by the third flow meter 33 is the refrigerant flow rate at the output end end of the outdoor heat exchanger. The flow rate detected by the fourth flow meter 34 is the refrigerant flow rate at the refrigerant recovery end of the compressor 11 . The controller will regularly collect the flow sizes of the first flow meter 31, the second flow meter 32, the third flow meter 33 and the fourth flow meter 34, and compare and compare the flow rates detected by the first flow meter 31 and the flow rates detected by the first flow meter 31 in real time. The flow rate detected by the second flow meter 32, the flow rate detected by the third flow meter 33 and the flow rate detected by the fourth flow meter 34:

When the refrigerant flow rate detected by the first flow meter 31 is greater than the refrigerant flow rate in the second flow meter 32 and the difference is greater than 5%, the controller judges that there is leakage of the refrigerant and performs forced fluorine collection. At this time, the The controller controls the third control valve 15 to be disconnected, the first control valve 23 to be turned on, and the high-pressure gaseous refrigerant passes through the compressor 11 through the four-way valve 4, the first control valve 23, the The first restrictor 22 (capillary throttling device 13) becomes a low-temperature and low-pressure liquid refrigerant and stores it in the refrigerant recovery device 21 (generally, the recovery time is controlled at about 2 minutes, depending on the size of the air conditioner). After the recovery is completed, the controller controls the first control valve 23 to be disconnected, the compressor 11 is shut down, and the alarm device is controlled to give an alarm;

When the refrigerant flow value detected by the first flow meter 31 is greater than the refrigerant flow value detected by the second flow meter 32 and the difference is within 5%, the controller continues to compare the refrigerant flow value detected by the third flow meter 33 The difference between the flow rate and the refrigerant flow rate detected by the fourth flow meter 34, and when the flow value detected by the third flow meter is greater than the flow value detected by the fourth flow meter 34 and the difference is greater than 5%, the The controller judges that there is leakage of the refrigerant, and executes forced fluorine collection. At this time, the controller controls the third control valve 15 to be disconnected, the first control valve 23 to be turned on, and the high-pressure gaseous refrigerant passes through the compressor 11 through the The four-way valve 4, the first control valve 23, and the first restrictor 22 (capillary throttling device 13) become low-temperature and low-pressure liquid refrigerant stored in the refrigerant recovery device 21 (general recovery time Control in about 2 minutes, depending on the size of the air conditioner), after the refrigerant recovery is completed, the controller controls the first control valve 23 to disconnect, the compressor 11 shuts down, and the alarm device gives an alarm;

When the flow value detected by the first flow meter 31 is greater than the flow value detected by the second flow meter 32, the flow value detected by the third flow meter 33 is greater than the flow value detected by the fourth flow meter 34, and When the difference between them is all within 5%, the controller stores the flow value detection data of the first detection of each flowmeter, and the same state is to be run next time (only for the fixed-frequency air conditioner) The cooling and heating states are the same. For the inverter air conditioner, it is the same cooling and heating state under the same operating frequency). flow rate and the difference is greater than 5%, the controller judges that there is leakage of the refrigerant, and executes forced fluorine collection. The gaseous refrigerant passes through the compressor 11 through the four-way valve 4, the first control valve 23, and the first restrictor 22 (capillary throttling device 13) to become a low-temperature and low-pressure liquid refrigerant stored in the In the refrigerant recovery device 21 (generally, the recovery time is controlled at about 2 minutes, depending on the size of the air conditioner), after the refrigerant recovery is completed, the controller controls the first control valve 23 to be disconnected, and the compressor 11 is shut down. , and the alarm device to alarm;

When the difference between the refrigerant flow rate detected by each flow meter before and after the two detections is within 5%, and at the same time each detection is decreasing, it is judged that there is a slight leakage of the refrigerant. The refrigerant flow value is compared with the refrigerant flow value of the current operating state in the same state. When the current refrigerant flow rate detected by each flow meter is less than the first detected refrigerant flow rate and the difference is less than 50%, the forced fluorine collection will not be performed. When the refrigerant flow rate is different If the value is greater than 50%, the controller judges that there is a leakage of the refrigerant, and performs forced fluorine collection, the controller controls the third control valve 15 to be disconnected, the first control valve 23 is turned on, and the high-pressure gaseous refrigerant passes through the compressor 11 Through the four-way valve 4, the first control valve 23, and the first restrictor 22 (capillary throttling device 13), the low-temperature and low-pressure liquid refrigerant is stored in the refrigerant recovery device 21 ( Generally, the recovery time is controlled at about 2 minutes, depending on the size of the air conditioner). After the refrigerant recovery is completed, the controller controls the first control valve 23 to disconnect, the compressor 11 to shut down, and the alarm device to report to the police.

When the air conditioner is in the heating state, the outdoor heat exchanger is connected to the refrigerant output end of the compressor 11, and the indoor heat exchanger is connected to the refrigerant recovery end of the compressor 11. At this time, Definition, the first heat exchanger 12 is an outdoor heat exchanger, the second heat exchanger 14 is an indoor heat exchanger, correspondingly, the flow rate detected by the first flow meter 31 is the flow rate of the compressor 11 The refrigerant flow at the refrigerant output end, the flow detected by the second flow meter 32 is the refrigerant flow at the input end of the outdoor heat exchanger, and the flow detected by the third flow meter 33 is the refrigerant flow at the output end of the indoor heat exchanger Flow rate, the flow rate detected by the fourth flow meter 34 is the refrigerant flow rate at the refrigerant recovery end of the compressor 11 . The anti-leakage control process of the air conditioner in the heating mode is basically the same as the anti-leakage control process of the air conditioner in the cooling mode, which will not be repeated here.

The present invention also provides an anti-leakage control method for an air conditioner, and Fig. 3 and Fig. 4 are an embodiment of the anti-leakage control method for an air conditioner provided by the present invention.

Please refer to Fig. 1, Fig. 3 and Fig. 4, the anti-leakage control method of described air conditioner comprises the following steps:

Step S102: Detect the flow of refrigerant in at least two different positions of the refrigerant working circuit 1;

Step S104: judging whether the refrigerant leaks according to the refrigerant flow difference at different positions of the refrigerant working circuit 1;

Step S106: According to the judgment result, control the operation of the refrigerant working circuit 1, the refrigerant recovery pipeline 2 and the compressor 11.

By detecting the refrigerant flow difference at different positions in the refrigerant working circuit 1 of the air conditioner, it is judged whether the refrigerant in the air conditioner leaks, thereby effectively monitoring the refrigerant leakage in the air conditioner.

In this embodiment, step S106 includes:

Step S1062: When it is determined that the refrigerant is leaking, the refrigerant working circuit 1 is controlled to be disconnected, the refrigerant recovery pipeline 2 is connected to the refrigerant output end of the compressor 11 to perform refrigerant recovery work, and when the refrigerant recovery work ends Then control the compressor 11 to shut down;

Step S1064: When it is determined that the refrigerant does not leak, the refrigerant working circuit 1 is controlled to be turned on, the refrigerant recovery pipeline 2 is disconnected from the refrigerant output end of the compressor 11, and the compressor 11 operates normally.

In this embodiment, step S106 also includes:

Step S1066: When it is determined that the refrigerant leaks, the controller controls the alarm device to issue an alarm for refrigerant leakage. The leakage alarm device can be an audio alarm device or/and a communication alarm device connected to the user's communication device by telecommunication, so that the user can be notified in time when the air conditioner leaks the refrigerant.

In this embodiment, step S102 includes:

Step S1022: the first flowmeter 31 detects the refrigerant flow rate at the end of the compressor 11 connected to the first heat exchanger 12;

Step S1024: The second flowmeter 32 detects the refrigerant flow rate at the end of the first heat exchanger 12 connected to the compressor 11 .

In this embodiment, the first heat exchanger 12 is an indoor heat exchanger, and the second heat exchanger 14 is an outdoor heat exchanger. Correspondingly, the first flow meter 31 detects that the compressor 11 The refrigerant flow rate at the refrigerant output end, the second flow meter 32 detects the refrigerant flow rate at the input end of the indoor heat exchanger, obviously, the present design is not limited thereto, and the second heat exchanger 14 can also be an indoor heat exchanger, so The first heat exchanger 12 can be an outdoor heat exchanger. Correspondingly, the first flowmeter 31 detects the refrigerant flow rate at the refrigerant recovery end of the compressor 11, and the second flowmeter 32 is used to detect the flow rate of the outdoor heat exchanger. Refrigerant flow at the output of the device.

In this embodiment, step S104 includes:

When the refrigerant flow value detected by the first flow meter 31 and the refrigerant flow value detected by the second flow meter 32 meet at least one of the following conditions, it is judged that the refrigerant leaks:

When the difference between the refrigerant flow value detected by the first flow meter 31 and the refrigerant flow value detected by the second flow meter 32 exceeds a first threshold;

When the difference between the refrigerant flow values detected twice before and after by the first flowmeter 31 exceeds the second threshold;

When the difference between the refrigerant flow values detected twice before and after by the second flow meter 32 exceeds the third threshold;

When the difference between the refrigerant flow value currently detected by the first flow meter 31 and the refrigerant flow value detected by the first flow meter 31 for the first time exceeds a fourth threshold; and,

When the difference between the currently detected refrigerant flow value of the second flow meter 32 and the refrigerant flow value detected by the second flow meter 32 for the first time exceeds the fifth threshold.

In this embodiment, in addition, in order to enhance the detection of the refrigerant working circuit 1, step S102 further includes:

Step S1026: the third flow meter detects the refrigerant flow rate at the end of the second heat exchanger 14 connected to the compressor 11;

Step S1028: The fourth flow meter 34 detects the refrigerant flow rate at the end of the compressor 11 connected to the second heat exchanger 14 .

In this embodiment, the first heat exchanger 12 is an indoor heat exchanger, and the second heat exchanger 14 is an outdoor heat exchanger. Correspondingly, the fourth flow meter 34 detects that the compressor 11 The refrigerant flow rate at the refrigerant recovery end, the third flow meter 33 is used to detect the refrigerant flow rate at the output end of the outdoor heat exchanger, obviously, this design is not limited thereto, and the second heat exchanger 14 can also be an indoor heat exchanger , the first heat exchanger 12 can be an outdoor heat exchanger, and correspondingly, the fourth flowmeter 34 detects the refrigerant flow rate at the refrigerant output end of the compressor 11, and the third flowmeter 33 is used to detect the indoor The refrigerant flow rate at the input end of the heat exchanger.

In this embodiment, step S104 also includes:

When the difference between the refrigerant flow value detected by the third flow meter 33 and the refrigerant flow value detected by the fourth flow meter 34 exceeds the first threshold, or/and, the third flow meter 33 detects twice before and after The difference of the refrigerant flow value exceeds the second threshold, or/and, the difference between the two refrigerant flow values detected by the fourth flowmeter 34 exceeds the third threshold, or/and, the third flowmeter 33 currently When the difference between the detected refrigerant flow value and the refrigerant flow value detected by the third flowmeter 33 for the first time exceeds the fourth threshold, or/and, the refrigerant flow value currently detected by the fourth flowmeter 34 is different from the When the difference between the refrigerant flow values detected by the fourth flow meter 34 for the first time exceeds the fifth threshold, it is determined that the refrigerant is leaking.

Please refer to Figure 2. Taking the first threshold, the second threshold, the third threshold, and the fourth threshold as 5%, and the fifth threshold as 50% as an example, the leakage prevention process of the dual-system air conditioner in cooling mode will be described in detail. illustrate:

Please refer to Fig. 2, define that the pipeline that described first heat exchanger 12 is connected with described compressor 11 is the first pipeline (unlabeled), and the pipeline that described second heat exchanger 14 is connected with described compressor 11 The pipeline is a second pipeline (not labeled), and the two ends of the refrigerant recovery pipeline 2 are correspondingly connected to the two ends of the compressor 11, and the refrigerant recovery pipeline 2 includes the refrigerant recovery device 21, a device The first restrictor 22 and the first control valve 23 in the pipeline between the refrigerant recovery device 21 and the compressor 11 , the valve between the refrigerant recovery device 21 and the compressor 11 The second restrictor 24 and the second control valve 25 in the pipeline, the first control valve 23 and the second control valve 25 are in the normally closed state, and the refrigerant working circuit 1 is in the normally open state The third control valve 15 and the fourth control valve 16, the third control valve 15 is arranged between the node between the refrigerant recovery pipeline 2 and the first connecting pipe and the first heat exchanger 12 Between, the fourth control valve 16 is arranged between the node between the refrigerant recovery pipeline 2 and the second connecting pipe and the second heat exchanger 14, the first control valve 23, the The second control valve 25, the third control valve 15 and the fourth control valve 16 are electrically connected to the controller, and the controller controls the first control valve 23, the second control valve The valve 25 , the third control valve 15 and the fourth control valve 16 are used to control the on-off of the refrigerant working circuit 1 and the refrigerant recovery pipeline 2 .

In addition, in this embodiment, the heat exchanger connected to the refrigerant output end of the compressor 11 is defined as the first heat exchanger 12, and the heat exchanger connected to the refrigerant recovery end of the compressor 11 is defined as the second heat exchanger. Heat exchanger 14, therefore, for a dual-system air conditioner, in heating and cooling mode, the first heat exchanger 12 and the second heat exchanger 14 are different:

When the air conditioner is in the cooling state, the first heat exchanger 12 is an indoor heat exchanger, and the second heat exchanger 14 is an outdoor heat exchanger. Correspondingly, the first flow meter 31 The detected flow rate is the refrigerant flow rate at the refrigerant output end of the compressor 11, the flow rate detected by the second flow meter 32 is the refrigerant flow rate at the input end of the indoor heat exchanger, and the flow rate detected by the third flow meter 33 is The refrigerant flow rate at the output end of the outdoor heat exchanger, the flow rate detected by the fourth flow meter 34 is the refrigerant flow rate at the refrigerant recovery end of the compressor 11 .

Taking the first threshold value, the second threshold value, the third threshold value, the fourth threshold value as 5%, and the fifth threshold value as 50% as an example, the leakage prevention process of the dual-system air conditioner in cooling mode will be described in detail below:

When the air conditioner is in cooling operation, the indoor heat exchanger is connected to the refrigerant output end of the compressor 11, and the outdoor heat exchanger is connected to the refrigerant recovery end of the compressor 11. At this time, by definition, the The first heat exchanger 12 is an indoor heat exchanger, and the second heat exchanger 14 is an outdoor heat exchanger. Correspondingly, the flow rate detected by the first flowmeter 31 is the flow rate of the refrigerant output end of the compressor 11. refrigerant flow rate, the flow rate detected by the second flow meter 32 is the refrigerant flow rate at the input end of the indoor heat exchanger, and the flow rate detected by the third flow meter 33 is the refrigerant flow rate at the output end end of the outdoor heat exchanger. The flow rate detected by the fourth flow meter 34 is the refrigerant flow rate at the refrigerant recovery end of the compressor 11 . The controller will regularly collect the flow sizes of the first flow meter 31, the second flow meter 32, the third flow meter 33 and the fourth flow meter 34, and compare and compare the flow rates detected by the first flow meter 31 and the flow rates detected by the first flow meter 31 in real time. The flow rate detected by the second flow meter 32, the flow rate detected by the third flow meter 33 and the flow rate detected by the fourth flow meter 34:

When the refrigerant flow rate detected by the first flow meter 31 is greater than the refrigerant flow rate in the second flow meter 32 and the difference is greater than 5%, the controller judges that there is leakage of the refrigerant and performs forced fluorine collection. At this time, the The controller controls the third control valve 15 to be disconnected, the first control valve 23 to be turned on, and the high-pressure gaseous refrigerant passes through the compressor 11 through the four-way valve 4, the first control valve 23, the The first restrictor 22 (capillary throttling device 13) becomes a low-temperature and low-pressure liquid refrigerant and stores it in the refrigerant recovery device 21 (generally, the recovery time is controlled at about 2 minutes, depending on the size of the air conditioner). After the recovery is completed, the controller controls the first control valve 23 to be disconnected, the compressor 11 is shut down, and the alarm device is controlled to give an alarm;

When the refrigerant flow value detected by the first flow meter 31 is greater than the refrigerant flow value detected by the second flow meter 32 and the difference is within 5%, the controller continues to compare the refrigerant flow value detected by the third flow meter 33 The difference between the flow rate and the refrigerant flow rate detected by the fourth flow meter 34, and when the flow value detected by the third flow meter is greater than the flow value detected by the fourth flow meter 34 and the difference is greater than 5%, the The controller judges that there is leakage of the refrigerant, and executes forced fluorine collection. At this time, the controller controls the third control valve 15 to be disconnected, the first control valve 23 to be turned on, and the high-pressure gaseous refrigerant passes through the compressor 11 through the The four-way valve 4, the first control valve 23, and the first restrictor 22 (capillary throttling device 13) become low-temperature and low-pressure liquid refrigerant stored in the refrigerant recovery device 21 (general recovery time Control in about 2 minutes, depending on the size of the air conditioner), after the refrigerant recovery is completed, the controller controls the first control valve 23 to disconnect, the compressor 11 shuts down, and the alarm device gives an alarm;

When the flow value detected by the first flow meter 31 is greater than the flow value detected by the second flow meter 32, the flow value detected by the third flow meter 33 is greater than the flow value detected by the fourth flow meter 34, and When the difference between them is all within 5%, the controller stores the flow value detection data of the first detection of each flowmeter, and the same state is to be run next time (only for the fixed-frequency air conditioner) The cooling and heating states are the same. For the inverter air conditioner, it is the same cooling and heating state under the same operating frequency). flow rate and the difference is greater than 5%, the controller judges that there is leakage of the refrigerant, and executes forced fluorine collection. The gaseous refrigerant passes through the compressor 11 through the four-way valve 4, the first control valve 23, and the first restrictor 22 (capillary throttling device 13) to become a low-temperature and low-pressure liquid refrigerant stored in the In the refrigerant recovery device 21 (generally, the recovery time is controlled at about 2 minutes, depending on the size of the air conditioner), after the refrigerant recovery is completed, the controller controls the first control valve 23 to be disconnected, and the compressor 11 is shut down. , and the alarm device to alarm;

When the difference between the refrigerant flow rate detected by each flow meter before and after the two detections is within 5%, and at the same time each detection is decreasing, it is judged that there is a slight leakage of the refrigerant. The refrigerant flow value is compared with the refrigerant flow value of the current operating state in the same state. When the current refrigerant flow rate detected by each flow meter is less than the first detected refrigerant flow rate and the difference is less than 50%, the forced fluorine collection will not be performed. When the refrigerant flow rate is different If the value is greater than 50%, the controller judges that there is a leakage of the refrigerant, and performs forced fluorine collection, the controller controls the third control valve 15 to be disconnected, the first control valve 23 is turned on, and the high-pressure gaseous refrigerant passes through the compressor 11 Through the four-way valve 4, the first control valve 23, and the first restrictor 22 (capillary throttling device 13), the low-temperature and low-pressure liquid refrigerant is stored in the refrigerant recovery device 21 ( Generally, the recovery time is controlled at about 2 minutes, depending on the size of the air conditioner). After the refrigerant recovery is completed, the controller controls the first control valve 23 to disconnect, the compressor 11 to shut down, and the alarm device to report to the police.

When the air conditioner is in the heating state, the outdoor heat exchanger is connected to the refrigerant output end of the compressor 11, and the indoor heat exchanger is connected to the refrigerant recovery end of the compressor 11. At this time, Definition, the first heat exchanger 12 is an outdoor heat exchanger, the second heat exchanger 14 is an indoor heat exchanger, correspondingly, the flow rate detected by the first flow meter 31 is the flow rate of the compressor 11 The refrigerant flow at the refrigerant output end, the flow detected by the second flow meter 32 is the refrigerant flow at the input end of the outdoor heat exchanger, and the flow detected by the third flow meter 33 is the refrigerant flow at the output end of the indoor heat exchanger Flow rate, the flow rate detected by the fourth flow meter 34 is the refrigerant flow rate at the refrigerant recovery end of the compressor 11 . The anti-leakage control process of the air conditioner in the heating mode is basically the same as the anti-leakage control process of the air conditioner in the cooling mode, which will not be repeated here.

The above are only preferred embodiments of the present invention, and are not intended to limit the scope of its patents. All equivalent structures or equivalent process transformations made by using the description of the present invention and the contents of the accompanying drawings are directly or indirectly used in other related technical fields. The theory is included in the patent protection scope of the present invention.

Claims (10)

1. An air conditioner, comprising at least a refrigerant working circuit composed of a compressor, a first heat exchanger and a second heat exchanger connected end to end in sequence, characterized in that the air conditioner also includes a first flow meter, a second flow meter Two flowmeters, a controller and a refrigerant recovery pipeline, the first flowmeter and the second flowmeter are arranged at different positions of the refrigerant working circuit to detect the refrigerant flow at different positions of the refrigerant working circuit , the refrigerant recovery pipeline is connected to the refrigerant output end of the compressor, and the controller is connected to the first flowmeter, the second flowmeter, the compressor, and the controller in the refrigerant working circuit The valve is electrically connected with the control valve of the refrigerant recovery pipeline, and is used to judge whether the refrigerant leaks according to the refrigerant flow difference at different positions of the refrigerant working circuit, so as to control the refrigerant working circuit, the refrigerant recovery pipe way as well as the compressor works. 2. The air conditioner according to claim 1, wherein the first flow meter and the second flow meter are arranged in the pipeline between the compressor and the first heat exchanger, And the first flow meter is set close to the compressor, and the second flow meter is set close to the first heat exchanger. 3. The air conditioner according to claim 2, wherein the controller is configured to determine refrigerant leakage when at least one of the following conditions occurs: When the difference between the refrigerant flow value detected by the first flow meter and the refrigerant flow value detected by the second flow meter exceeds a first threshold; When the difference between the refrigerant flow values detected twice before and after the first flowmeter exceeds the second threshold; When the difference between the two refrigerant flow values detected by the second flow meter before and after it exceeds the third threshold; When the difference between the refrigerant flow value currently detected by the first flow meter and the refrigerant flow value detected by the first flow meter for the first time exceeds a fourth threshold; and, When the difference between the currently detected refrigerant flow value of the second flow meter and the refrigerant flow value detected by the second flow meter for the first time exceeds the fifth threshold. 4. The air conditioner according to claim 1, wherein the flow detection device further comprises a third flow meter and a fourth flow meter, the third flow meter and the fourth flow meter are arranged on the In the pipeline between the compressor and the second heat exchanger, the fourth flowmeter is arranged close to the compressor, and the third flowmeter is arranged close to the second heat exchanger. 5. The air conditioner according to claim 4, wherein the controller is further configured to determine refrigerant leakage when at least one of the following conditions occurs: When the difference between the refrigerant flow value detected by the third flow meter and the refrigerant flow value detected by the fourth flow meter exceeds a first threshold; When the difference between the two refrigerant flow values detected by the third flowmeter before and after exceeds the second threshold; When the difference between the refrigerant flow values detected twice before and after the fourth flowmeter exceeds the third threshold; When the difference between the refrigerant flow value currently detected by the third flow meter and the refrigerant flow value detected by the third flow meter for the first time exceeds a fourth threshold; and, When the difference between the refrigerant flow value currently detected by the fourth flow meter and the refrigerant flow value detected by the fourth flow meter for the first time exceeds the fifth threshold. 6. An anti-leakage control method of an air conditioner, characterized in that, the anti-leakage control method of the air conditioner comprises the following steps: Detecting the flow of refrigerant in at least two different positions of the refrigerant working circuit; Judging whether the refrigerant leaks according to the refrigerant flow difference at different positions of the refrigerant working circuit; According to the judgment result, the refrigerant working circuit, the refrigerant recovery pipeline and the compressor are controlled. 7. The anti-leakage control method of an air conditioner according to claim 6, wherein the step of detecting the refrigerant flow rates at at least two different positions of the refrigerant working circuit comprises: The first flowmeter detects the refrigerant flow rate at the end of the compressor connected to the first heat exchanger; The second flowmeter detects the refrigerant flow rate at the end of the first heat exchanger connected to the compressor. 8. The anti-leakage control method of an air conditioner according to claim 7, wherein the step of judging whether the refrigerant leaks according to the refrigerant flow difference at different positions of the refrigerant working circuit comprises: When the refrigerant flow value detected by the first flowmeter and the refrigerant flow value detected by the second flowmeter meet at least one of the following conditions, it is determined that the refrigerant is leaking: When the difference between the refrigerant flow value detected by the first flow meter and the refrigerant flow value detected by the second flow meter exceeds a first threshold; When the difference between the two refrigerant flow values detected by the first flow meter before and after exceeds the second threshold; When the difference between the refrigerant flow values detected twice before and after the second flowmeter exceeds the third threshold; When the difference between the refrigerant flow value currently detected by the first flow meter and the refrigerant flow value detected by the first flow meter for the first time exceeds a fourth threshold; and, When the difference between the currently detected refrigerant flow value of the second flow meter and the refrigerant flow value detected by the second flow meter for the first time exceeds the fifth threshold. 9. The anti-leakage control method of an air conditioner as claimed in claim 6, wherein the step of detecting the refrigerant flow rate of the refrigerant working circuit further comprises: The third flow meter detects the refrigerant flow rate at the end of the second heat exchanger connected to the compressor; The fourth flowmeter detects the refrigerant flow rate at the end of the compressor connected to the second heat exchanger. 10. The anti-leakage control method of an air conditioner according to claim 9, wherein the step of judging whether the refrigerant leaks according to the refrigerant flow difference at different positions of the refrigerant working circuit further comprises: When the refrigerant flow value detected by the third flowmeter and the refrigerant flow value detected by the fourth flowmeter meet at least one of the following conditions, it is determined that the refrigerant is leaking: When the difference between the refrigerant flow value detected by the third flow meter and the refrigerant flow value detected by the fourth flow meter exceeds a first threshold; When the difference between the two refrigerant flow values detected by the third flowmeter before and after exceeds the second threshold; When the difference between the refrigerant flow values detected twice before and after the fourth flowmeter exceeds the third threshold; When the difference between the refrigerant flow value currently detected by the third flow meter and the refrigerant flow value detected by the third flow meter for the first time exceeds a fourth threshold; and, When the difference between the refrigerant flow value currently detected by the fourth flow meter and the refrigerant flow value detected by the fourth flow meter for the first time exceeds the fifth threshold.