CN117968198A - Air conditioning unit with refrigerant recovery function and refrigerant recovery control method thereof - Google Patents

Abstract

The invention belongs to the technical field of air conditioners, and particularly provides an air conditioning unit with a refrigerant recovery function and a refrigerant recovery control method thereof. Aims at solving the problems that the refrigerant recovery mode of the existing air conditioning unit is not good, so that the recovery is not clean or the reutilization is difficult to realize. Therefore, the air conditioning unit comprises a refrigerant circulation loop, a refrigerant recovery component and a refrigerant leakage monitoring device, wherein the refrigerant recovery component is arranged to be capable of recovering a refrigerant, the refrigerant leakage monitoring device is capable of monitoring the refrigerant leakage condition in the refrigerant circulation loop, and the refrigerant circulation loop is provided with a first stop valve, a second stop valve and a third stop valve.

Description

Air conditioning unit with refrigerant recovery function and refrigerant recovery control method thereof

Technical Field

The present invention belongs to the technical field of air conditioners, and specifically provides an air conditioner unit with a refrigerant recovery function and a refrigerant recovery control method thereof.

Background technique

The existing refrigerant recovery method of air-conditioning units has the problem of insufficient refrigerant recovery for long piping systems or multi-split systems, which leads to a high risk of explosion after indoor leakage. For example, R32 refrigerant has gradually replaced R22 and R410a refrigerants in the air-conditioning field because it does not damage the ozone layer and has little impact on the greenhouse effect, and has good thermal physical and safety properties. However, it still has certain flammability. Therefore, the system using R32 refrigerant needs to have a device to detect refrigerant leakage, as well as a device to recover the remaining refrigerant in the system after detecting the refrigerant leakage. By recycling the refrigerant, on the one hand, the leakage can be reduced and the risk of explosion can be reduced. On the other hand, the recovered refrigerant can be reused after the leakage point is eliminated, which reduces the loss and improves environmental protection. Therefore, refrigerant recovery is very necessary.

Specifically, the existing refrigerant recovery method has used a condenser to store the recovered refrigerant. Due to the size limitation of the condenser, this control method cannot completely recover the refrigerant, and a large amount of refrigerant still remains in the system pipeline. In order to prevent the refrigerant from leaking from the damaged indoor unit, a stop valve has to be added, which increases the cost; and the refrigerant in the pipeline needs to be discharged during maintenance, causing environmental pollution and refrigerant waste. In addition, some air-conditioning units use a gas-liquid separator to store the recovered refrigerant, or use a combination of a condenser and a gas-liquid separator to store the recovered refrigerant, but this control method easily leads to too much liquid refrigerant in the gas-liquid separator, which in turn causes the problem of liquid shock or wet compression when the compressor is started, and even causes the problem of damage to the compressor, and may also cause the pressure in a certain part of the pipeline to be too high, resulting in problems such as pipe bursts, such as the part of the condenser hairpin pipe.

Accordingly, the art requires a new air conditioning unit with a refrigerant recovery function and a refrigerant recovery control method thereof to solve the above technical problems.

Summary of the invention

The present invention aims to solve the above technical problem, that is, to solve the problem that the refrigerant recovery method of the existing air-conditioning unit is poor and easily leads to incomplete recovery or difficulty in reuse.

In a first aspect, the present invention provides an air conditioning unit with a refrigerant recovery function, the air conditioning unit comprising a refrigerant circulation loop and a refrigerant leakage monitoring device,

The refrigerant circulation loop is provided with an outdoor heat exchanger, a compressor, an indoor heat exchanger and a refrigerant recovery component in sequence, and the refrigerant recovery component is configured to recover the refrigerant.

The refrigerant leakage monitoring device is configured to monitor the refrigerant leakage in the refrigerant circulation loop and selectively control the refrigerant recovery component to recover the refrigerant in the refrigerant circulation loop according to the monitoring result.

The refrigerant circulation loop is also provided with a first stop valve, a second stop valve and a third stop valve, wherein the first stop valve is arranged between the outdoor heat exchanger and the refrigerant recovery component, the second stop valve is arranged between the refrigerant recovery component and the indoor heat exchanger, and the third stop valve is arranged between the indoor heat exchanger and the compressor.

In the preferred technical solution of the above-mentioned air-conditioning unit with refrigerant recovery function, the refrigerant recovery component includes a refrigerant recovery tank and a refrigerant inlet pipe and a refrigerant outlet pipe arranged on the refrigerant recovery tank, and the refrigerant recovery tank is connected to the refrigerant circulation circuit through the refrigerant inlet pipe and the refrigerant outlet pipe.

In the preferred technical solution of the above-mentioned air-conditioning unit with refrigerant recovery function, the refrigerant inlet pipe and the refrigerant outlet pipe are the same pipe, which is recorded as the refrigerant inlet and outlet pipe.

In the preferred technical solution of the above-mentioned air-conditioning unit with refrigerant recovery function, a refrigerant shut-off valve is provided on the refrigerant inlet and outlet pipes.

In a second aspect, the present invention further provides a refrigerant recovery control method for an air-conditioning unit, wherein the air-conditioning unit comprises a refrigerant circulation loop and a refrigerant leakage monitoring device.

The refrigerant circulation loop is provided with an outdoor heat exchanger, a compressor, an indoor heat exchanger and a refrigerant recovery component in sequence, and the refrigerant recovery component is configured to recover the refrigerant.

The refrigerant leakage monitoring device is configured to monitor the refrigerant leakage in the refrigerant circulation loop and selectively control the refrigerant recovery component to recover the refrigerant in the refrigerant circulation loop according to the monitoring result.

The refrigerant circulation circuit is further provided with a first stop valve, a second stop valve and a third stop valve, wherein the first stop valve is provided between the outdoor heat exchanger and the refrigerant recovery component, the second stop valve is provided between the refrigerant recovery component and the indoor heat exchanger, and the third stop valve is provided between the indoor heat exchanger and the compressor;

The refrigerant recovery control method comprises:

When the refrigerant leakage monitoring device detects leakage in the refrigerant circulation loop, the refrigerant in the refrigerant circulation loop is operated in a preset circulation direction so that the indoor heat exchanger is used as an evaporator and the outdoor heat exchanger is used as a condenser;

The second stop valve is controlled to be closed.

In the preferred technical solution of the refrigerant recovery control method of the air-conditioning unit, after executing the step of "controlling the second stop valve to close", the refrigerant recovery control method further includes:

Obtaining the return air pressure of the refrigerant circulation loop;

According to the return air pressure of the refrigerant circulation loop, the third stop valve is selectively controlled to be closed and/or the compressor is controlled to stop running.

In the preferred technical solution of the refrigerant recovery control method of the air-conditioning unit, the step of "selectively controlling the third stop valve to close and/or controlling the compressor to stop running according to the return air pressure of the refrigerant circulation loop" specifically includes:

If the return air pressure of the refrigerant circulation loop is lower than the preset return air pressure, the third stop valve is controlled to be closed.

In the preferred technical solution of the refrigerant recovery control method of the air-conditioning unit, the step of "selectively controlling the third stop valve to close and/or controlling the compressor to stop running according to the return air pressure of the refrigerant circulation loop" specifically includes:

If the return air pressure of the refrigerant circulation loop is less than the preset return air pressure, the compressor is controlled to stop running.

In the preferred technical solution of the refrigerant recovery control method of the air-conditioning unit, an indoor stop valve is further provided on the refrigerant circulation loop, and the indoor stop valve is provided at the outlet of the indoor heat exchanger on the side away from the indoor electronic expansion valve. The refrigerant recovery control method further includes:

After controlling the second stop valve to close for a preset time, controlling the indoor electronic expansion valve and the indoor stop valve to close.

In the preferred technical solution of the refrigerant recovery control method of the air-conditioning unit, after executing the step of "controlling the compressor to stop running", the refrigerant recovery control method further includes:

The first stop valve is controlled to be closed.

When adopting the above technical scheme, the air-conditioning unit of the present invention includes a refrigerant circulation loop and a refrigerant leakage monitoring device, wherein the refrigerant circulation loop is sequentially provided with an outdoor heat exchanger, a compressor, an indoor heat exchanger and a refrigerant recovery component, the refrigerant recovery component is configured to be able to recover refrigerant, and the refrigerant leakage monitoring device is configured to be able to monitor the refrigerant leakage in the refrigerant circulation loop to selectively control the refrigerant recovery component to recover the refrigerant in the refrigerant circulation loop according to the monitoring result, and the refrigerant circulation loop is also provided with a first stop valve, a second stop valve and a third stop valve, wherein the first stop valve is arranged between the outdoor heat exchanger and the refrigerant recovery component, the second stop valve is arranged between the refrigerant recovery component and the indoor heat exchanger, and the third stop valve is arranged between the indoor heat exchanger and the compressor. Based on the above structural setting, the present invention recovers the refrigerant by adding an independent refrigerant recovery component, thereby effectively ensuring that the refrigerant can be effectively recovered, and the present invention also assists in the refrigerant recovery control by adding a first stop valve, a second stop valve and a third stop valve, thereby ensuring to the greatest extent possible that the refrigerant can be recovered into the refrigerant recovery component for reuse next time.

Furthermore, based on the above-mentioned structural arrangement, the refrigerant recovery control method of the present invention includes: when the refrigerant leakage monitoring device detects leakage in the refrigerant circulation loop, the refrigerant in the refrigerant circulation loop is operated in a preset circulation direction, so that the indoor heat exchanger is used as an evaporator and the outdoor heat exchanger is used as a condenser, and then the second stop valve is controlled to be closed, thereby effectively ensuring that the refrigerant can be quickly introduced into the refrigerant recovery component, thereby effectively improving the refrigerant recovery efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

FIG1 is a schematic diagram of the overall structure of a first preferred embodiment of an air conditioning unit of the present invention;

FIG2 is a schematic diagram of the overall structure of a second preferred embodiment of an air conditioning unit of the present invention;

3 is a schematic diagram of the overall structure of a third preferred embodiment of an air conditioning unit of the present invention;

FIG4 is a flow chart of the main steps of the refrigerant recovery control method of the present invention;

FIG5 is a flowchart of specific steps of a preferred embodiment of the refrigerant recovery control method of the present invention;

Reference numerals:

11. Outdoor heat exchanger;

12. compressor; 121. gas-liquid separator;

13. Indoor heat exchanger;

14. Refrigerant recovery component; 141. Refrigerant inlet pipe; 142. Refrigerant outlet pipe; 143. Refrigerant inlet and outlet pipes; 144. Refrigerant stop valve;

15. The first stop valve;

16. Second stop valve;

17. The third stop valve;

18. Indoor electronic expansion valve;

19. Indoor stop valve;

101. Refrigerant leakage monitoring device.

Detailed ways

The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific applications. For example, the air conditioning unit described in the present invention can be a household central air conditioner or a commercial air conditioning system, which is not restrictive. Such changes in the application objects do not deviate from the basic principles of the present invention and belong to the scope of protection of the present invention.

It should be noted that, in the description of the preferred embodiment, unless otherwise clearly specified and limited, the term "connected" and the like should be understood in a broad sense, for example, it can be directly connected, it can also be indirectly connected through an intermediate medium, and it can also be connected inside two elements, so it cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

In addition, it should be noted that in the description of the present invention, although the various steps of the control method of the present invention are described in this application in a specific order, these orders are not restrictive. Without departing from the basic principles of the present invention, those skilled in the art can perform the steps in a different order.

First, refer to Figures 1 to 3, wherein Figure 1 is a schematic diagram of the overall structure of the first preferred embodiment of the air-conditioning unit of the present invention, Figure 2 is a schematic diagram of the overall structure of the second preferred embodiment of the air-conditioning unit of the present invention, and Figure 3 is a schematic diagram of the overall structure of the third preferred embodiment of the air-conditioning unit of the present invention. As shown in Figures 1 to 3, the air-conditioning unit of the present invention includes an indoor unit and an outdoor unit, a refrigerant circulation loop is provided between the indoor unit and the outdoor unit, and a refrigerant for heat exchange between indoors and outdoors circulates in the refrigerant circulation loop. Specifically, the refrigerant circulation loop is provided with an outdoor heat exchanger 11, a compressor 12, an indoor heat exchanger 13 and a refrigerant recovery component 14 in sequence, the outdoor heat exchanger 11 is provided in the outdoor unit, an outdoor fan (not shown in the figure) is provided near the outdoor heat exchanger 11, the indoor heat exchanger 13 is provided in the indoor unit, an indoor fan (not shown in the figure) is provided near the indoor heat exchanger 13, the refrigerant can be continuously circulated between the outdoor heat exchanger 11 and the indoor heat exchanger 13 through the refrigerant circulation loop to achieve heat exchange, the refrigerant recovery component 14 is configured to be able to recover the refrigerant, and a gas-liquid separator 121 is also provided at the inlet of the compressor 12, and an indoor electronic expansion valve 18 is provided at the outlet of the indoor heat exchanger 13 on the side close to the refrigerant recovery component 14. In this preferred embodiment, the number of indoor heat exchangers 13 is two, the two indoor heat exchangers 13 are provided in parallel, and each indoor heat exchanger 13 is provided with an indoor electronic expansion valve 18. Of course, the present invention does not impose any limitation on the specific number of indoor heat exchangers 13 , and those skilled in the art can set it according to actual use requirements, which is not restrictive.

In addition, it should be noted that the present invention does not impose any restrictions on the basic structure of the air-conditioning unit and the various components arranged on the refrigerant circulation loop, and those skilled in the art can set them according to actual use requirements; for example, a four-way valve can also be provided on the refrigerant circulation loop, and when the four-way valve is switched, it can control the reverse circulation of the refrigerant in the refrigerant circulation loop, so that the air-conditioning unit can switch between cooling and heating conditions; for another example, an outdoor electronic expansion valve can also be provided on the refrigerant circulation loop.

Further, referring to Figures 1 to 3, the refrigerant circulation loop is also provided with a first stop valve 15, a second stop valve 16, a third stop valve 17 and an indoor stop valve 19, wherein the first stop valve 15 is provided between the outdoor heat exchanger 11 and the refrigerant recovery component 14, the second stop valve 16 is provided between the refrigerant recovery component 14 and the indoor heat exchanger 13, the third stop valve 17 is provided between the indoor heat exchanger 13 and the compressor 12, and the indoor stop valve 19 is provided between the indoor heat exchanger 13 and the third stop valve 17. Of course, it should also be noted that the present invention does not impose any restrictions on the specific types of each stop valve, and those skilled in the art can set them according to actual use requirements.

Furthermore, the air conditioning unit of the present invention further includes a refrigerant leakage monitoring device 101. In the preferred embodiment, the refrigerant leakage monitoring device 101 is disposed near the indoor stop valve 19, and the refrigerant leakage monitoring device 101 is configured to monitor the refrigerant leakage in the refrigerant circulation loop so as to selectively control the refrigerant recovery component 14 to recover the refrigerant in the refrigerant circulation loop according to the monitoring result. It should be noted that the present invention does not impose any restrictions on the specific structure and specific setting position of the refrigerant leakage monitoring device 101, as long as the refrigerant leakage monitoring device 101 can monitor the refrigerant leakage in the refrigerant circulation loop so as to selectively control the refrigerant recovery component 14 to recover the refrigerant in the refrigerant circulation loop according to the monitoring result.

As a first preferred embodiment of the refrigerant recovery component 14, as shown in FIG1, the refrigerant recovery component 14 includes a refrigerant recovery tank and a refrigerant inlet pipe 141 and a refrigerant outlet pipe 142 arranged on the refrigerant recovery tank, and the refrigerant recovery tank is connected to the refrigerant circulation circuit through the refrigerant inlet pipe 141 and the refrigerant outlet pipe 142. Based on this, the refrigerant recovery component 14 can simultaneously realize the input and output of the refrigerant through the refrigerant inlet pipe 141 and the refrigerant outlet pipe 142, so that its application is more flexible.

As a second preferred embodiment of the refrigerant recovery component 14, as shown in FIG2 , the refrigerant recovery component 14 includes a refrigerant recovery tank and a refrigerant inlet and outlet pipe 143 disposed on the refrigerant recovery tank, and the refrigerant recovery tank is connected to the refrigerant circulation circuit through the refrigerant inlet and outlet pipe 143. Based on this, the refrigerant recovery component 14 controls the inlet and outlet of the refrigerant only through one refrigerant inlet and outlet pipe 143, thereby effectively ensuring the uniqueness of the refrigerant circulation direction, and further effectively ensuring its reliability.

As a third preferred embodiment of the refrigerant recovery component 14, as shown in FIG3, the refrigerant recovery component 14 includes a refrigerant recovery tank and a refrigerant inlet and outlet pipe 143 disposed on the refrigerant recovery tank, a refrigerant stop valve 144 is disposed on the refrigerant inlet and outlet pipe 143, and the refrigerant recovery tank is connected to the refrigerant circulation circuit through the refrigerant inlet and outlet pipe 143. Based on this, the refrigerant recovery component 14 controls the inlet and outlet of the refrigerant only through one refrigerant inlet and outlet pipe 143, and further controls its on-off state by adding a refrigerant stop valve 144, so as to maximize the reliability of refrigerant transportation.

It should be noted that the present invention does not impose any restrictions on the specific structure of the refrigerant recovery member 14, and those skilled in the art can set it according to actual use requirements. In addition, the present invention does not impose any restrictions on the specific structure and shape of the refrigerant recovery tank, as long as it can store refrigerant.

In addition, the air conditioning unit of the present invention further includes a controller, which can obtain monitoring information of the refrigerant leakage monitoring device 101 and can also control the operating state of the air conditioning unit. Of course, this is not restrictive. It can be understood by those skilled in the art that the present invention does not impose any restrictions on the specific structure and model of the controller, and the controller can be either the original controller of the air conditioning unit or a controller separately set for executing the refrigerant recovery control method of the present invention. Those skilled in the art can set the structure and model of the controller according to actual use requirements.

Next, refer to FIG4 , which is a flow chart of the main steps of the refrigerant recovery control method of the present invention. As shown in FIG4 , based on the air conditioning unit described in the above embodiment, the refrigerant recovery control method of the present invention mainly includes the following steps:

S1: When the refrigerant leakage monitoring device detects leakage in the refrigerant circulation loop, the refrigerant in the refrigerant circulation loop is operated in a preset circulation direction so that the indoor heat exchanger is used as an evaporator and the outdoor heat exchanger is used as a condenser;

S2: Control the second stop valve to close.

Furthermore, in step S1, when the refrigerant leakage monitoring device 101 detects leakage in the refrigerant circulation loop, the refrigerant in the refrigerant circulation loop is operated in a preset circulation direction, so that the indoor heat exchanger 13 is used as an evaporator and the outdoor heat exchanger 11 is used as a condenser. In other words, when the air-conditioning unit is in a heating condition, the air-conditioning unit is switched to a cooling condition, so that the indoor heat exchanger 13 is used as an evaporator and the outdoor heat exchanger 11 is used as a condenser; and when the air-conditioning unit is in a cooling condition, the air-conditioning unit is maintained in a cooling condition.

It should be noted that the present invention does not impose any restrictions on the specific type of the refrigerant leakage monitoring device 101 and its detection position, that is, the present invention does not impose any restrictions on how to detect whether the refrigerant circulation loop has a leak, and technical personnel in this field can set it according to actual usage requirements.

Furthermore, in step S2, after the refrigerant in the refrigerant circulation loop runs in a preset circulation direction, the second stop valve 16 is controlled to close so as to cut off the outlet of the refrigerant recovery component 14, thereby effectively realizing refrigerant recovery.

Finally, refer to Figure 5, which is a flowchart of the specific steps of a preferred embodiment of the refrigerant recovery control method of the present invention. As shown in Figure 5, based on the air conditioning unit described in the above embodiment, the refrigerant recovery control method of the preferred embodiment of the present invention specifically includes the following steps:

S101: When the refrigerant leakage monitoring device detects a leakage in the refrigerant circulation loop, the refrigerant in the refrigerant circulation loop is operated in a preset circulation direction so that the indoor heat exchanger is used as an evaporator and the outdoor heat exchanger is used as a condenser;

S102: Control the second stop valve to close;

S103: Obtaining the return air pressure of the refrigerant circulation loop;

S104: Determine whether the return air pressure is less than the preset return air pressure; if yes, execute step S105; if no, execute step S103 again;

S105: Control the third stop valve to close and control the compressor to stop running;

S106: Control the first stop valve to close.

First, in step S101, when the refrigerant leakage monitoring device 101 detects that the refrigerant circulation loop has a leak, the refrigerant in the refrigerant circulation loop is operated in a preset circulation direction so that the indoor heat exchanger 13 is used as an evaporator and the outdoor heat exchanger 11 is used as a condenser. In other words, when the air-conditioning unit is in a heating condition, the air-conditioning unit is switched to a cooling condition so that the indoor heat exchanger 13 is used as an evaporator and the outdoor heat exchanger 11 is used as a condenser; and when the air-conditioning unit is in a cooling condition, the air-conditioning unit is maintained in a cooling condition. It should be noted that the present invention does not impose any restrictions on the specific type of the refrigerant leakage monitoring device 101 and its detection position, that is, the present invention does not impose any restrictions on how to detect whether the refrigerant circulation loop has a leak, and those skilled in the art can set it according to actual use requirements.

Next, in step S102, after the refrigerant in the refrigerant circulation loop runs in the preset circulation direction, the second stop valve 16 is controlled to be closed so as to cut off the outlet of the refrigerant recovery component 14, thereby effectively realizing the refrigerant recovery. After the second stop valve 16 is controlled to be closed, that is, after the refrigerant begins to be recovered, step S103 is executed, that is, the return air pressure of the refrigerant circulation loop is obtained, so as to selectively control the third stop valve 16 to be closed and/or control the compressor 12 to stop running according to the return air pressure of the refrigerant circulation loop. It should be noted that the present invention does not impose any restrictions on the specific value of the preset return air pressure, and those skilled in the art can set it according to actual use requirements.

Based on the judgment result of step S104, if the return air pressure of the refrigerant circulation loop is greater than or equal to the preset return air pressure, it means that there is still a lot of refrigerant in the refrigerant circulation loop. In this case, step S103 is executed again, that is, the return air pressure of the refrigerant circulation loop is obtained again, so as to make a real-time judgment. If the return air pressure of the refrigerant circulation loop is less than the preset return air pressure, step S105 is executed, that is, the third stop valve 16 is controlled to close and the compressor 12 is controlled to stop running. It should be noted that although the opening and closing states of the third stop valve 16 and the compressor 12 are synchronously controlled based on the return air pressure of the refrigerant circulation loop in this preferred embodiment, this is obviously not restrictive, and those skilled in the art can also choose one to control.

In addition, based on the above control, when the structure of the refrigerant recovery component 14 adopts the third preferred embodiment, if the return air pressure of the refrigerant circulation loop is less than the preset return air pressure, it is necessary to further control the refrigerant shut-off valve 144 to close, so as to ensure to the greatest extent that the refrigerant can be stored in the refrigerant recovery component 14 without leaking.

Finally, after controlling the third stop valve 16 to close and controlling the compressor 12 to stop running, step S106 is executed, that is, controlling the first stop valve 15 to close, so as to better seal the refrigerant into the refrigerant recovery component 14, thereby effectively completing the recovery of the refrigerant.

In addition, as a preferred control method, when the refrigerant leakage monitoring device 101 detects leakage in the refrigerant circulation loop, the indoor electronic expansion valve 18 is controlled to be closed, so as to effectively avoid the problem of refrigerant leaking through the pipeline of the indoor unit again during the refrigerant recovery process. Further preferably, after controlling the second stop valve 16 to close for a preset time, the indoor stop valve 19 is controlled to be closed, so as to effectively ensure that the refrigerant in the indoor unit can be recovered into the refrigerant recovery component 14 as much as possible, so as to effectively reduce the amount of refrigerant leaking from the indoor unit to the room, and then on the basis of effectively reducing the pollution caused by refrigerant leakage, it can also effectively increase the amount of refrigerant recovery and reuse. In addition, it should be noted that the present invention does not impose any restrictions on the specific value of the preset time, and those skilled in the art can set it according to actual use requirements.

So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims (10)

1. An air conditioning unit with refrigerant recovery function is characterized in that the air conditioning unit comprises a refrigerant circulation loop and a refrigerant leakage monitoring device,

The refrigerant circulation loop is sequentially provided with an outdoor heat exchanger, a compressor, an indoor heat exchanger and a refrigerant recovery component, the refrigerant recovery component is arranged to be capable of recovering refrigerant,

The refrigerant leakage monitoring device is arranged to monitor the refrigerant leakage condition in the refrigerant circulation loop so as to selectively control the refrigerant recovery component to recover the refrigerant in the refrigerant circulation loop according to the monitoring result,

The refrigerant circulation loop is further provided with a first stop valve, a second stop valve and a third stop valve, wherein the first stop valve is arranged between the outdoor heat exchanger and the refrigerant recovery member, the second stop valve is arranged between the refrigerant recovery member and the indoor heat exchanger, and the third stop valve is arranged between the indoor heat exchanger and the compressor.

2. The air conditioning unit according to claim 1, wherein the refrigerant recovery member includes a refrigerant recovery tank, and a refrigerant inlet pipe and a refrigerant outlet pipe provided on the refrigerant recovery tank, and the refrigerant recovery tank is communicated with the refrigerant circulation circuit through the refrigerant inlet pipe and the refrigerant outlet pipe.

3. The air conditioning unit according to claim 2, wherein the refrigerant inlet pipe and the refrigerant outlet pipe are the same pipe, and are denoted as refrigerant inlet pipe and refrigerant outlet pipe.

4. The air conditioning unit according to claim 3, wherein a refrigerant shut-off valve is provided on the refrigerant inlet/outlet pipe.

5. The refrigerant recovery control method of the air conditioning unit is characterized in that the air conditioning unit comprises a refrigerant circulation loop and a refrigerant leakage monitoring device, wherein an outdoor heat exchanger, a compressor, an indoor heat exchanger and a refrigerant recovery member are sequentially arranged on the refrigerant circulation loop, the refrigerant recovery member is arranged to be capable of recovering refrigerant, the refrigerant leakage monitoring device is arranged to be capable of monitoring refrigerant leakage in the refrigerant circulation loop so as to selectively control the refrigerant recovery member to recover the refrigerant in the refrigerant circulation loop according to a monitoring result, a first stop valve, a second stop valve and a third stop valve are further arranged on the refrigerant circulation loop, the first stop valve is arranged between the outdoor heat exchanger and the refrigerant recovery member, the second stop valve is arranged between the refrigerant recovery member and the indoor heat exchanger, and the third stop valve is arranged between the indoor heat exchanger and the compressor;

the refrigerant recovery control method comprises the following steps:

when the refrigerant leakage monitoring device monitors that the refrigerant circulation loop leaks, the refrigerant in the refrigerant circulation loop is enabled to run in a preset circulation direction, so that the indoor heat exchanger is used as an evaporator and the outdoor heat exchanger is used as a condenser;

And controlling the second stop valve to be closed.

6. The refrigerant recovery control method according to claim 5, wherein after the step of "controlling the second shut-off valve to close" is performed, the refrigerant recovery control method further comprises:

Acquiring the return air pressure of the refrigerant circulation loop;

And selectively controlling the third stop valve to be closed and/or controlling the compressor to stop running according to the return air pressure of the refrigerant circulation loop.

7. The refrigerant recovery control method according to claim 6, wherein the step of selectively controlling the third shut-off valve to be closed and/or controlling the compressor to be stopped according to the return air pressure of the refrigerant circulation circuit specifically comprises:

And if the return air pressure of the refrigerant circulation loop is smaller than the preset return air pressure, controlling the third stop valve to be closed.

8. The refrigerant recovery control method according to claim 6, wherein the step of selectively controlling the third shut-off valve to be closed and/or controlling the compressor to be stopped according to the return air pressure of the refrigerant circulation circuit specifically comprises:

and if the return air pressure of the refrigerant circulation loop is smaller than the preset return air pressure, controlling the compressor to stop running.

9. The refrigerant recovery control method according to any one of claims 5 to 8, characterized in that an indoor shutoff valve is further provided on the refrigerant circulation circuit, the indoor shutoff valve being provided at an outlet of a side of the indoor heat exchanger remote from an indoor electronic expansion valve, the refrigerant recovery control method further comprising:

And after the second stop valve is controlled to be closed for a preset time period, the indoor electronic expansion valve and the indoor stop valve are controlled to be closed.

10. The refrigerant recovery control method according to any one of claims 6 to 8, characterized in that after the step of "controlling the compressor to stop operation" is performed, the refrigerant recovery control method further comprises:

And controlling the first stop valve to be closed.