Air Conditioner

Abstract

The present invention discloses an air conditioner, which comprises an indoor unit, a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger and a controller; a refrigerant detection component is arranged at an air outlet of the indoor unit; a high-pressure detection component is arranged between the four-way valve and the refrigerant outlet of the compressor, and a low-pressure detection component is formed between the four-way valve and the refrigerant inlet of the compressor; an electronic expansion valve is arranged between the outdoor heat exchanger and the indoor heat exchanger; the controller is configured to control the four-way valve to make the indoor heat exchanger work as an evaporator in response to a leakage signal detected by the refrigerant detection component; the compressor is controlled to work at a preset frequency within a preset recovery cycle, the pressure signals of the high-pressure detection component and the low-pressure detection component are received, and the opening of the electronic expansion valve within the preset recovery cycle is controlled; the air conditioner involved in the present application can recover the refrigerant leaked from the indoor side through its own control and adjustment when the refrigerant leaks, thereby reducing the use risk of the refrigerant, improving the safety performance, and having strong practicality.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioning, and in particular, relates to an air conditioner. Background Art

[0002] The refrigerant types used in traditional air conditioners are generally R22 and R410A. However, due to the high ODP and high GWP (ODP is the global warming potential, which is a quantity that describes the ability of a substance to destroy stratospheric ozone; GWP is the global warming potential, a quantity used to express and compare the impact of ozone-depleting substances on global warming), these two refrigerants are prone to produce a greenhouse effect and cause damage to the environment. Therefore, environmentally friendly refrigerants such as R32 and R290 are gradually replacing them as air conditioning refrigerants.

[0003] R32 and R290 have less injection volume and lower cost, but both R32 and R290 refrigerants are flammable and explosive. During use, once they leak into the room and reach a certain concentration, there will be a risk of explosion. Therefore, timely detection of R32 and R290 refrigerant leakage and timely recovery are important measures for the safe use of air conditioners.

[0004] There are also methods for recovering leaked refrigerant in the prior art, but they generally have complex components and high failure rates; the compressor suddenly starts and stops during the refrigerant recovery process, causing system damage or incomplete recovery. Summary of the invention

[0005] The purpose of the present invention is to provide an air conditioner to solve the problem in the prior art that after the refrigerant in the existing air conditioner leaks into the room, the detection and recovery are not timely, causing dangers such as combustion and explosion. There are great safety hazards during use, posing a threat to the safety of users.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] The present invention provides an air conditioner, comprising:

[0008] The indoor unit has a refrigerant detection component provided at its air outlet;

[0009] A compressor having a refrigerant outlet and a refrigerant inlet formed thereon;

[0010] A four-way valve, wherein a high-pressure detection component is provided between the four-way valve and the refrigerant outlet of the compressor, and a low-pressure detection component is formed between the four-way valve and the refrigerant inlet of the compressor;

[0011] An indoor heat exchanger; located inside the indoor unit and connected to the compressor via a four-way valve;

[0012] An outdoor heat exchanger, which is connected to the compressor through a four-way valve, and an electronic expansion valve is provided between the outdoor heat exchanger and the indoor heat exchanger;

[0013] Controller, configured as:

[0014] In response to the leakage signal detected by the refrigerant detection component, the four-way valve is controlled to make the indoor heat exchanger work as an evaporator; the compressor is controlled to work at a preset frequency within a preset recovery cycle, the pressure signals of the high-pressure detection component and the low-pressure detection component are received, and the opening of the electronic expansion valve within the preset recovery cycle is controlled.

[0015] In some embodiments of the present application, the four-way valve includes an input port, a return port, a first port and a second port, the input port is connected to the refrigerant outlet of the compressor, the return port is connected to the refrigerant inlet of the compressor, the first port is connected to the indoor heat exchanger, and the second port is connected to the outdoor heat exchanger.

[0016] In some embodiments of the present application, the refrigerant detection component is used to detect the refrigerant concentration inside the room. When the refrigerant concentration is greater than a preset concentration, the controller connects the first port of the four-way valve with the reflux port, and the second port with the input port, and the outdoor heat exchanger acts as a condenser and the indoor heat exchanger acts as an evaporator; otherwise, the air conditioner continues to operate according to the user-set mode.

[0017] In some embodiments of the present application, the operating time of the air conditioner in the refrigerant recovery stage includes multiple recovery cycles, and the number of recovery cycles and the duration of each recovery cycle are determined according to actual user needs.

[0018] In some embodiments of the present application, when the refrigerant detection component detects that the indoor refrigerant concentration is greater than a preset concentration, the controller controls the frequency of the compressor in the first recovery cycle T1 to be F1, F1=Fmax (Fmax is the maximum operating frequency of the compressor), and controls the opening degree of the electronic expansion valve in the first recovery cycle T1 to be E1;

[0019] In the first recovery cycle T1, the high-pressure detection component detects the outdoor pressure Pd in ​​real time. When the outdoor pressure Pd is greater than the preset outdoor maximum pressure Pdmax, the frequency F1 of the compressor is gradually reduced to F1=F1-nx until the outdoor pressure Pd is no greater than the preset outdoor maximum pressure Pdmax. At this time, the compressor continues to operate at the adjusted F1 frequency.

[0020] When the outdoor pressure Pd is not greater than the maximum outdoor pressure Pdmax, the compressor frequency continues to run at F1=Fmax until the low-pressure detection component detects that the indoor pressure Pl is less than the preset indoor minimum pressure Plmin or the running time exceeds the first recovery cycle T1.

[0021] In some embodiments of the present application, in the nth recovery cycle Tn, the controller controls the operating frequency Fn of the compressor to be F1-(n-1)f, where f is the change amount of the compressor in different recovery cycles;

[0022] The controller controls the opening degree En of the electronic expansion valve in the nth recovery cycle Tn to be E1- (n-1)e; e is the change amount of the electronic expansion valve in different recovery cycles;

[0023] When the low-pressure detection component detects that the indoor pressure Pl is less than the preset indoor minimum pressure Plmin, the controller controls the compressor to stop and the opening of the electronic expansion valve is set to 0.

[0024] In some embodiments of the present application, during the refrigerant recovery process, the opening E1 of the electronic expansion valve is smaller than the opening E0 of the electronic expansion valve during normal operation of the air conditioner, the high-pressure detection element is a high-pressure pressure sensor, and the low-pressure detection element is a low-pressure pressure sensor.

[0025] In some embodiments of the present application, a one-way valve is formed between the four-way valve and the refrigerant inlet of the compressor to prevent the refrigerant from flowing back from the refrigerant inlet of the compressor into the indoor unit.

[0026] In some embodiments of the present application, a liquid-side stop valve is provided between the electronic expansion valve and the indoor heat exchanger.

[0027] In some embodiments of the present application, a gas-side stop valve is provided between the indoor heat exchanger and the compressor.

[0028] Compared with the prior art, the advantages and positive effects of the present invention are:

[0029] The air conditioner involved in the present application, after the refrigerant detection component detects refrigerant leakage in the indoor unit, the controller controls the air conditioner to start the refrigerant recovery process, and an electronic expansion valve is arranged between the outdoor heat exchanger and the indoor heat exchanger. The specific operating frequency and opening degree of the compressor and the electronic expansion valve gradually decrease in different recovery cycles, which is beneficial to improve the refrigerant recovery effect and avoid problems such as system damage or incomplete recovery caused by sudden switching, thereby reducing the risk of refrigerant use, improving safety performance, and having strong practicality.

[0030] The setting of the low-pressure switch can prevent air from entering the compressor, and avoid the mixing of air with flammable and explosive refrigerants such as R32 and R290 in the compressor, which may lead to dangers such as explosion of the air conditioner; the high-pressure switch can prevent the excessive high pressure caused by the high-frequency operation of the compressor, and avoid the risk of pipeline leakage and explosion.

[0031] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 is a system principle diagram of an embodiment of the air conditioner proposed by the present invention;

[0034] Figure 2 is a schematic diagram of the refrigerant flow direction of the air conditioner during the refrigerant recovery process proposed by the present invention;

[0035] Figure 3 It is a schematic diagram of part of the structure of the outdoor unit of the air conditioner;

[0036] Figure 4 It is a schematic diagram of the external structure of the outdoor unit of the air conditioner;

[0037] Figure 5 This is a schematic diagram of the refrigerant recovery control process of the air conditioner;

[0038] In the figure,

[0039] 10. Compressor;

[0040] 20. Four-way valve; 21. Input port; 22. Return port; 23. First port; 24. Second port;

[0041] 30. Indoor heat exchanger; 31. Indoor fan;

[0042] 40. Outdoor heat exchanger; 31. Outdoor fan;

[0043] 50. Electronic expansion valve;

[0044] 60. Low voltage detection parts;

[0045] 70. High voltage detection parts;

[0046] 80. One-way valve;

[0047] 91. Liquid side stop valve;

[0048] 92. Gas side stop valve. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0055] The air conditioner includes an indoor unit installed in an indoor space. The indoor unit is connected to an outdoor unit (not shown) installed in an outdoor space through a pipe. The outdoor unit may be provided with a compressor, an outdoor heat exchanger, an outdoor fan, an expander and similar components of a refrigeration cycle, and the indoor unit may also be provided with an indoor heat exchanger and an indoor fan.

[0056] The air conditioner performs the air conditioner's refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat the indoor space.

[0057] The low-temperature and low-pressure refrigerant enters the compressor, which compresses it into high-temperature and high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0058] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature and low-pressure refrigerant gas to the compressor. The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0059] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0060] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0061] The air conditioner piping includes a liquid pipe through which condensed liquid refrigerant flows, and a gas pipe through which evaporated gas refrigerant flows.

[0062] The liquid pipe and the gas pipe are arranged on one side of the heat exchanger to guide the refrigerant into the indoor heat exchanger or discharge the refrigerant from the outdoor heat exchanger. For example, when the air conditioner performs cooling operation, the liquid pipe arranged in the indoor unit can guide the refrigerant into the indoor heat exchanger, and the gas pipe can guide the discharge of the gas refrigerant evaporated in the indoor heat exchanger.

[0063] like Figure 1-5 As shown, the present application proposes an air conditioner, which includes an indoor unit and an outdoor unit. The indoor unit is formed with a return air inlet and an air outlet. The air outlet of the indoor unit is provided with a refrigerant detection component. When there is a refrigerant leak in the indoor unit, the refrigerant detection component detects the refrigerant in time and feeds it back to the air conditioner, and the air conditioner starts the refrigerant recovery process accordingly.

[0064] The air conditioner comprises a compressor 10, a four-way valve 20, an indoor heat exchanger 30, an outdoor heat exchanger 40, an electronic expansion valve 50 and the like to form a refrigerant circulation system. The indoor heat exchanger 30 is located in the indoor unit, and the outdoor heat exchanger 40 is located in the outdoor unit.

[0065] A liquid-side stop valve 91 is provided between the electronic expansion valve 50 and the indoor heat exchanger 30 ; and a gas-side stop valve 92 is provided between the indoor heat exchanger 30 and the compressor 10 .

[0066] The indoor heat exchanger 30 is connected to the compressor 10 through the four-way valve 20 ; the outdoor heat exchanger 40 is connected to the compressor 10 through the four-way valve 20 , and the electronic expansion valve 50 is located between the outdoor heat exchanger 40 and the indoor heat exchanger 30 .

[0067] A refrigerant outlet and a refrigerant inlet are formed on the compressor 10. The compressor 10 is the heart of the refrigeration system. It inhales low-temperature and low-pressure refrigerant gas from the refrigerant inlet, compresses it by driving the piston through the operation of the motor, and outputs high-temperature and high-pressure refrigerant from the refrigerant outlet to provide power for the refrigeration cycle.

[0068] The four-way valve 20 includes an input port 21, a return port 22, a first port 23 and a second port 24. The input port 21 is connected to the refrigerant outlet of the compressor 10, the return port 22 is connected to the refrigerant inlet of the compressor 10, the first port 23 is connected to the indoor heat exchanger 30, and the second port 24 is connected to the outdoor heat exchanger 40.

[0069] A high-pressure detection component 70 is arranged between the four-way valve 20 and the refrigerant outlet of the compressor 10 for detecting the fluid pressure in the outdoor heat exchanger 40 , and a low-pressure detection component 60 is formed between the four-way valve 20 and the refrigerant inlet of the compressor 10 for detecting the fluid pressure in the indoor heat exchanger 30 .

[0070] The controller is electrically connected to the refrigerant detection element, the compressor 10, the electronic expansion valve 50, the high pressure detection element 70 and the low pressure detection element 60, and is configured to respond to a leakage signal detected by the refrigerant detection element.

[0071] When the refrigerant detection component detects that the indoor unit outlet is outputting refrigerant and the refrigerant content is higher than the preset content, a refrigerant leakage signal is transmitted to the controller.

[0072] The controller controls the air conditioner to enter the refrigerant recovery state, otherwise, the air conditioner continues to operate according to the user-set mode.

[0073] The indoor unit also includes an indoor fan 31, and the outdoor unit includes an outdoor fan 31. The indoor fan 31 and the outdoor fan 31 are also connected to the controller.

[0074] When a leak occurs in the indoor unit, the controller controls the indoor fan 31 to run at the highest speed. The indoor fan 31 can blow the leaked refrigerant in the outdoor unit into the air, reduce the refrigerant concentration in the environment, thereby reducing the adverse effects caused by the refrigerant leakage and improving the safety of the air conditioner during use.

[0075] The refrigerant recovery state is a refrigeration process. At this time, the controller controls the input port 21 of the four-way valve 20 to be connected with the second port 24 , and the return port 22 to be connected with the first port 23 .

[0076] At this time, the high-temperature and high-pressure refrigerant output from the compressor 10 is delivered to the outdoor heat exchanger 40, the outdoor heat exchanger 40 works as a condenser, and the indoor heat exchanger 30 works as an evaporator;

[0077] The controller controls the compressor 10 to operate at a preset frequency within a preset recovery period.

[0078] The controller is also used to receive pressure signals from the high-pressure detection element 70 and the low-pressure detection element 60, and control the opening degree of the electronic expansion valve 50 within a preset recovery period.

[0079] The pre-set operating time of the refrigerant recovery phase of the air conditioner includes multiple recovery cycles, specifically the first recovery cycle T1, the second recovery cycle T2, the third recovery cycle T3, etc. The number of recovery cycles and the duration of each recovery cycle are determined according to the actual needs of the user, for example, T1=2min; T2=2min.

[0080] refer to Figure 5 Specifically, when the refrigerant detection component detects that the refrigerant concentration inside the room is greater than the preset concentration, the controller controls the frequency of the compressor 10 in the first recovery period T1 to be F1.

[0081] Initially, the frequency F1 of the compressor 10 is set to Fmax (Fmax is the maximum operating frequency of the compressor 10), and the opening degree of the electronic expansion valve 50 in the first recovery period T1 is controlled to be E1.

[0082] For example, define Fmax=90Hz, E1=150 steps. It should be noted that the opening E1 of the electronic expansion valve 50 is smaller than the opening E0 of the electronic expansion valve 50 under normal working conditions, and the value of E0 is approximately 200 steps to 300 steps.

[0083] The specific value of Fmax is determined according to the actual maximum operating frequency of the compressor.

[0084] In the first recovery cycle T1, the high-pressure detection element 70 detects the outdoor pressure Pd in ​​real time. When the outdoor pressure Pd is greater than the preset outdoor maximum pressure Pdmax, the frequency F1 of the compressor 10 is gradually reduced to F1=F1-nx.

[0085] Of course, the Pdmax value varies for different refrigerants. For example, the Pdmax of refrigerant R32 is 4.3MPa. The maximum outdoor pressure needs to be set according to the corresponding refrigerant material.

[0086] Wherein, x is the amount by which the compressor 10 is reduced each time in the first recovery cycle T1, until the outdoor pressure Pd is no greater than the preset outdoor maximum pressure Pdmax. At this time, the compressor 10 continues to operate at the adjusted F1 frequency to prevent the outdoor refrigerant pressure from being too high, causing pipeline leakage and explosion.

[0087] When the outdoor pressure Pd is not greater than the maximum outdoor pressure Pdmax, the compressor 10 continues to operate at a frequency of F1=Fmax until the low-pressure detection element 60 detects that the indoor pressure Pl is less than the preset minimum indoor pressure Plmin or the operating time exceeds the first recovery period T1.

[0088] The value of the minimum indoor pressure Plmin can be set to 0.15Mpa, because the atmospheric pressure is 0.1MPa, that is, when Plmin is less than 0.15Mpa, the refrigerant on the indoor side has been basically recovered into the compressor 10, and the low pressure on the indoor side is still higher than the atmospheric pressure.

[0089] At this time, the refrigerant is basically completely recovered. If it continues to be recovered, it will mainly inhale air. At this time, in order to prevent too much air from flowing back into the compressor 10 and causing an explosion, the controller is shut down in time to stop the recovery.

[0090] If the first recovery cycle T1 ends and the second recovery cycle continues, the difference from the first recovery cycle is that in the second recovery cycle, the frequency of the compressor 10 continues to decrease by the unit f, where f is the change of the compressor 10 in different recovery cycles, that is: F2=F1-f; the opening of the electronic expansion valve 50 decreases by the unit e, where e is the change of the electronic expansion valve 50 in different recovery cycles, that is, E2= E1-e.

[0091] At this time, the refrigerant recovery is continued, and at the same time, the value of the minimum indoor pressure Plmin is monitored in real time. When Plmin is less than 0.15Mpa, it means that the refrigerant is completely recovered, and the compressor 10 and the electronic expansion valve 50 are shut down in the second recovery cycle T2.

[0092] Otherwise, the operation continues until entering the third recovery cycle. In the third recovery cycle, the frequency of the compressor 10 continues to decrease by unit f on the basis of the second recovery cycle, that is: F3=F1-2f; the opening of the electronic expansion valve 50 decreases by unit e, that is, E3= E1-2e.

[0093] In this way, in the nth recovery cycle Tn, the controller controls the operating frequency Fn=F1-(n-1)f of the compressor 10, and controls the opening degree En=E1-(n-1)e of the electronic expansion valve 50 in the nth recovery cycle Tn.

[0094] When the low-pressure detection component 60 detects that the indoor pressure Pl is lower than the preset indoor minimum pressure Plmin, the controller controls the compressor 10 to shut down, sets the opening of the electronic expansion valve 50 to 0, and finally closes the liquid side stop valve 91 and the gas side stop valve 92 to prevent the refrigerant from continuing to be transported to the indoor unit of the air conditioner.

[0095] The above air conditioner is provided with a refrigerant recovery process, and the compressor 10 and the electronic expansion valve 50 are closed in steps to prevent sudden closure to 0, which causes the system to increase in high pressure instantly, resulting in system damage or incomplete recovery.

[0096] The high-pressure detection element 70 is a high-pressure pressure sensor, which prevents the system from being in high-frequency operation all the time, resulting in excessive high pressure, which exceeds the maximum operating pressure of the system (generally 4.3MPa for the R32 system), causing pipeline leakage and explosion.

[0097] The low-pressure detection element 60 is a low-pressure pressure sensor. The addition of a low-pressure pressure switch prevents air from entering the system (atmospheric pressure 0.1MPa). If flammable and explosive refrigerants such as R32 and R290 are mixed into the air, it will directly cause the air conditioner to explode.

[0098] A one-way valve 80 is formed between the four-way valve 20 and the refrigerant inlet of the compressor 10. No additional solenoid valve or solenoid stop valve is required to prevent the refrigerant from flowing to the indoor unit on the suction side, thereby preventing the refrigerant from flowing back from the refrigerant inlet end of the compressor 10 to the indoor unit.

[0099] The air conditioner involved in the present application can recover the refrigerant leaked from the indoor side through its own control and adjustment when the refrigerant leaks, thereby reducing the risk of using the refrigerant, improving safety performance, and having strong practicality.

[0100] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0101] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air conditioner, characterized in that: include: The indoor unit has a refrigerant detection component provided at its air outlet; A compressor having a refrigerant outlet and a refrigerant inlet formed thereon; A four-way valve, wherein a high-pressure detection component is provided between the four-way valve and the refrigerant outlet of the compressor, and a low-pressure detection component is formed between the four-way valve and the refrigerant inlet of the compressor; Indoor heat exchanger; It is located inside the indoor unit and is connected to the compressor through a four-way valve; an outdoor heat exchanger, which is connected to the compressor through a four-way valve, and an electronic expansion valve is provided between the outdoor heat exchanger and the indoor heat exchanger; Controller, configured as: In response to the leakage signal detected by the refrigerant detection element, the four-way valve is controlled to make the indoor heat exchanger work as an evaporator; the compressor is controlled to work at a preset frequency within a preset recovery cycle, the pressure signals of the high-pressure detection element and the low-pressure detection element are received, and the opening degree of the electronic expansion valve within the preset recovery cycle is controlled; When the refrigerant detection component detects that the indoor refrigerant concentration is greater than the preset concentration, the controller controls the frequency of the compressor in the first recovery cycle T1 to be F1, F1=Fmax, Fmax is the maximum operating frequency of the compressor, and controls the opening degree of the electronic expansion valve in the first recovery cycle T1 to be E1; In the first recovery cycle T1, the high-pressure detection component detects the outdoor pressure Pd in ​​real time. When the outdoor pressure Pd is greater than the preset outdoor maximum pressure Pdmax, the frequency F1 of the compressor is gradually reduced to F1=F1-nx until the outdoor pressure Pd is no greater than the preset outdoor maximum pressure Pdmax, where x is the amount by which the compressor frequency is reduced each time in the first recovery cycle T1. At this time, the compressor continues to operate at the adjusted frequency F1. When the outdoor pressure Pd is not greater than the maximum outdoor pressure Pdmax, the compressor frequency continues to operate at F1=Fmax until the low-pressure detection element detects that the indoor pressure Pl is less than the preset indoor minimum pressure Plmin or the operating time exceeds the first recovery period T1; In the nth recovery cycle Tn, the controller controls the operating frequency of the compressor to be Fn=F1-(n-1)f, where f is the change of the compressor in different recovery cycles; The controller controls the opening degree of the electronic expansion valve in the nth recovery cycle Tn to be En=E1- (n-1)e; e is the change amount of the electronic expansion valve in different recovery cycles; When the low-pressure detection component detects that the indoor pressure Pl is less than the preset indoor minimum pressure Plmin, the controller controls the compressor to stop and the opening of the electronic expansion valve is set to 0.

2. The air conditioner according to claim 1, characterized in that: The four-way valve includes an input port, a return port, a first port and a second port. The input port is connected to the refrigerant outlet of the compressor, the return port is connected to the refrigerant inlet of the compressor, the first port is connected to the indoor heat exchanger, and the second port is connected to the outdoor heat exchanger.

3. The air conditioner according to claim 2, characterized in that: The refrigerant detection element is used to detect the refrigerant concentration inside the room. When the refrigerant concentration is greater than a preset concentration, the controller connects the first port of the four-way valve to the return port, and the second port to the input port. The outdoor heat exchanger acts as a condenser, and the indoor heat exchanger acts as an evaporator. Otherwise, the air conditioner continues to operate according to the user setting mode.

4. The air conditioner according to claim 1, characterized in that: The operating time of the air conditioner in the refrigerant recovery stage includes multiple recovery cycles, and the number of recovery cycles and the duration of each recovery cycle are determined according to the actual needs of the user.

5. The air conditioner according to claim 1, characterized in that: During the refrigerant recovery process, the opening E1 of the electronic expansion valve is smaller than the opening E0 of the electronic expansion valve during the normal operation of the air conditioner, the high-pressure detection element is a high-pressure pressure sensor, and the low-pressure detection element is a low-pressure pressure sensor.

6. The air conditioner according to claim 1, characterized in that: A one-way valve is formed between the four-way valve and the refrigerant inlet of the compressor to prevent the refrigerant from flowing back from the refrigerant inlet end of the compressor into the indoor unit.

7. The air conditioner according to claim 1, characterized in that: A liquid-side stop valve is provided between the electronic expansion valve and the indoor heat exchanger.

8. The air conditioner according to claim 1, characterized in that: A gas-side stop valve is provided between the indoor heat exchanger and the compressor.

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