WO2024001316A1 - Air conditioner - Google Patents

Abstract

Disclosed is an air conditioner. The air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a compressor, a concentration sensor and a controller, wherein the compressor is configured to compress a gaseous refrigerant; the concentration sensor is disposed indoors and is configured to detect the current concentration value of a refrigerant in an indoor environment; and the controller is configured to: when the current concentration value of the refrigerant, which is detected by means of the concentration sensor, is greater than or equal to a preset first leakage concentration value, and the indoor heat exchanger is working as an evaporator, control the air conditioner to operate in a first recycling mode, and when the current concentration value of the refrigerant, which is detected by means of the concentration sensor, is greater than or equal to the preset first leakage concentration value, and the indoor heat exchanger is working as a condenser, control the air conditioner to operate in a second recycling mode.

Description

air conditioner

This application claims the priority of the Chinese patent application with application number 202210763742.4, submitted on June 30, 2022, and the priority of the Chinese patent application with application number 202210763748.1, submitted on June 30, 2022, the entire contents of which incorporated herein by reference.

Technical field

The present disclosure relates to the technical field of household appliances, and in particular to an air conditioner.

Background technique

The air conditioner performs the refrigeration cycle of the air conditioner by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle consists of a series of processes involving compression, condensation, expansion and evaporation. The refrigeration cycle of the air conditioner is inseparable from the refrigerant. The refrigerant releases heat when it condenses and liquefies, and absorbs heat when it evaporates and vaporizes, thereby realizing the exchange and transfer of heat.

Contents of the invention

On the one hand, an air conditioner is provided. The air conditioner includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, a concentration sensor and a controller. The compressor is configured to compress gaseous refrigerant. The concentration sensor is installed indoors and configured to detect the current concentration value of the refrigerant in the indoor environment. The controller is configured to control the refrigerant when the current concentration value of the refrigerant detected by the concentration sensor is greater than or equal to a preset first leakage concentration value and the indoor heat exchanger works as an evaporator. The air conditioner operates in a first recovery mode; and when the current concentration value of the refrigerant detected by the concentration sensor is greater than or equal to a preset first leakage concentration value, and the indoor heat exchanger works as a condenser , controlling the air conditioner to run the second recovery mode.

In another aspect, an air conditioner is provided. The air conditioner includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, an expansion valve, a first solenoid valve, a concentration sensor and a controller. The first solenoid valve is disposed on the pipeline between the expansion valve and the indoor heat exchanger, and is configured to regulate flow in the pipeline between the expansion valve and the indoor heat exchanger. The flow rate of the medium. The concentration sensor is configured to detect a current concentration value of the refrigerant in the indoor environment. The controller is configured to control the first solenoid valve to close when the indoor heat exchanger works as an evaporator and the compressor operates at a target operating frequency; and when the concentration sensor detects a refrigeration When the current concentration value of the agent is less than the preset concentration threshold, the current opening of the expansion valve is detected, and the expansion valve is controlled to adjust to the preset target opening at an adjustment rate within the preset valve adjustment time. The adjustment rate is the ratio of the difference between the current opening and the target opening and the valve adjustment time.

Description of drawings

In order to explain the technical solutions in the present disclosure more clearly, the drawings required to be used in some embodiments of the present disclosure will be briefly introduced below. However, the drawings in the following description are only the drawings of some embodiments of the present disclosure. , for those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of the present disclosure.

Figure 1A is a block diagram of an air conditioner according to some embodiments;

Figure 1B is a structural diagram of an indoor unit of an air conditioner according to some embodiments;

Figure 2 is a structural diagram of an air conditioner according to some embodiments;

Figure 3 is a structural diagram of another air conditioner according to some embodiments;

Figure 4 is a block diagram of another air conditioner provided according to some embodiments;

Figure 5 is a flow chart of a controller of an air conditioner according to some embodiments;

Figure 6 is a flow chart of a first recovery mode of an air conditioner according to some embodiments;

Figure 7 is a flow chart of a second recovery mode of an air conditioner according to some embodiments;

Figure 8 is a flow chart of another controller of an air conditioner according to some embodiments;

Figure 9 is a flow chart of yet another controller of an air conditioner according to some embodiments.

Detailed ways

The technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments provided by this disclosure, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of this disclosure.

Unless the context otherwise requires, throughout the specification and claims, the term "comprise" and its other forms such as the third person singular "comprises" and the present participle "comprising" are used. Interpreted as open and inclusive, it means "including, but not limited to." In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific "example" or "some examples" and the like are intended to indicate that a particular feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

Hereinafter, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

In describing some embodiments, expressions "coupled" and "connected" and their derivatives may be used. The term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integrated connection; it can be a direct connection or an indirect connection through an intermediate medium. The term "coupled" indicates that two or more components are in direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited by the content herein.

"At least one of A, B and C" has the same meaning as "at least one of A, B or C" and includes the following combinations of A, B and C: A only, B only, C only, A and B The combination of A and C, the combination of B and C, and the combination of A, B and C.

The use of "suitable for" or "configured to" in this document implies open and inclusive language that does not exclude devices that are suitable for or configured to perform additional tasks or steps.

As used herein, "about," "approximately," or "approximately" includes the stated value as well as an average within an acceptable range of deviations from the particular value, as determined by one of ordinary skill in the art. Determined taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system).

In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outside", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present application and simplifying the description, and are not indicated or implied. The devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the application.

With the widespread use of air conditioners, users' environmental requirements for air conditioners are also constantly increasing. The refrigeration cycle of air conditioners is inseparable from refrigerants. For example, R290 refrigerant does not pollute the environment. Therefore, R290 refrigerant is widely used in the field of air conditioners. However, R290 refrigerant is flammable. When R290 refrigerant leaks, there are safety risks, such as explosion.

Normally, air conditioners are equipped with anti-disassembly structures and warning labels. For example, setting up an anti-disassembly structure on an air conditioner can prevent the air conditioner from being disassembled in the indoor environment and prevent refrigerant from leaking into the indoor environment due to artificial disassembly. Posting a warning label on the air conditioner or near where the air conditioner is installed can remind indoor residents of the dangers of refrigerant leakage.

However, it is understandable that the above settings cannot completely avoid refrigerant leakage during operation of the air conditioner. For example, an anti-disassembly structure on the air conditioner can prevent the air conditioner from being disassembled again indoors, thereby preventing refrigerant leakage due to poor reassembly of the air conditioner. However, if refrigerant is present when the air conditioner is first installed In the case of leakage, installing an anti-disassembly structure on the air conditioner cannot effectively prevent the leakage of refrigerant. In addition, posting warning labels can only remind people who pay attention to the content of the warning labels, but the effect on people who do not pay attention is very limited.

Methods to detect refrigerant leaks include pressure testing and leak detection agent methods.

For example, when using the pressure test method to detect refrigerant leakage, one or more pressure gauges need to be installed in the refrigerant circuit of the air conditioner. When any pressure gauge detects a rapid decrease in the refrigerant pressure in the refrigerant circuit, , it can be judged that the refrigerant is leaking. However, the pressure test method cannot determine the location of refrigerant leakage, and when the degree of refrigerant leakage is low, it is impossible to make an accurate judgment on the refrigerant leakage situation.

For example, when using the leak detection agent method to detect refrigerant leakage, a leak detection agent needs to be added to the refrigerant circuit. The leak detection agent can dye the refrigerant. In this way, when the refrigerant leaks, the leak detection agent will follow. It leaks out together with the refrigerant, thereby alerting the user. However, adding a leak detector to the refrigerant may cause a decrease in the performance of the refrigerant, such as a decrease in the cooling capacity of the refrigerant. If the leak detector leaks together with the refrigerant, it may cause greater safety hazards.

Some embodiments of the present disclosure provide an air conditioner 1000. As shown in FIGS. 1A and 1B , the air conditioner 1000 includes an outdoor unit 1, an indoor unit 2, and an expansion valve 3. The outdoor unit 1 includes a compressor 11 and an outdoor heat exchanger 12 . The indoor unit 2 includes an indoor heat exchanger 21 . The expansion valve 3 may be provided in the outdoor unit 1 or the indoor unit 2 .

The outdoor heat exchanger 12 and the indoor heat exchanger 21 may function as evaporators or condensers. For example, when the outdoor heat exchanger 12 functions as an evaporator and the indoor heat exchanger 21 functions as a condenser, the air conditioner 1000 operates a heating cycle. When the outdoor heat exchanger 12 functions as a condenser and the indoor heat exchanger 21 functions as an evaporator, the air conditioner 1000 operates a refrigeration cycle.

The air conditioner 1000 performs a refrigeration cycle or a heating cycle through the compressor 11, the condenser, the expansion valve 3, and the evaporator. Refrigeration cycle and heating cycle include compression process, condensation process, expansion process and evaporation process. During each process of the refrigeration cycle and the heating cycle, cooling or heat is provided to the indoor space through the heat absorption or release of the refrigerant, thereby regulating the temperature of the indoor space.

The compressor 11 compresses the refrigerant gas into a high-temperature and high-pressure state and discharges the refrigerant gas from the compressor 11 . The refrigerant gas compressed by the compressor 11 flows into the condenser. The condenser condenses the compressed high-temperature and high-pressure gaseous refrigerant into liquid refrigerant, and the heat of the refrigerant is released to the surrounding environment through the condensation process.

The liquid refrigerant flowing out from the condenser enters the expansion valve 3, and the expansion valve 3 expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into low-pressure liquid refrigerant. The low-pressure liquid refrigerant flowing out from the expansion valve 3 enters the evaporator. When the liquid refrigerant flows through the evaporator, it absorbs heat and evaporates into low-temperature and low-pressure refrigerant gas. The low-temperature and low-pressure refrigerant gas returns to the compressor 11 .

The evaporator can achieve the refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. During the circulating flow of the refrigerant, the air conditioner 1000 can adjust the temperature of the indoor space. The indoor unit 2 also includes an air outlet 22, a first air guide plate 23 and a second air guide plate 24. Through the air outlet 22, the first air guide plate 23 and the second air guide plate 24, the refrigerant can exchange heat with the indoor environment, thereby reducing the temperature of the indoor environment.

In some embodiments, as shown in Figures 2 and 3, the air conditioner 1000 further includes a pipeline 4, a first solenoid valve 51, a second solenoid valve 52, a first stop valve 61, a second stop valve 62 and a four-way Valve 7.

The pipeline 4 is configured to connect the indoor heat exchanger 21 , the outdoor heat exchanger 12 , the compressor 11 , the expansion valve 3 , the first solenoid valve 51 , the second solenoid valve 52 , the first stop valve 61 , and the second stop valve 62 Connect with four-way valve 7 to form a refrigerant circuit. The refrigerant circulates in the refrigerant circuit and exchanges heat with the air through the outdoor heat exchanger 12 and the indoor heat exchanger 21 respectively to realize the refrigeration cycle or the heating cycle of the air conditioner 1000 .

The expansion valve 3 is connected between the indoor heat exchanger 21 and the outdoor heat exchanger 12 and is configured to expand the liquid refrigerant that has undergone the condensation process into a low-pressure liquid refrigerant. For example, the expansion valve 3 is an electronic expansion valve.

The first solenoid valve 51 is disposed in the pipeline 4 between the expansion valve 3 and the indoor heat exchanger 21 and is configured to regulate the flow rate of the flowing medium in the pipeline 4 . The first stop valve 61 is disposed in the pipeline 4 between the first solenoid valve 51 and the indoor heat exchanger 21 , and is configured to cut off and throttle the pipeline 4 between the first solenoid valve 51 and the indoor heat exchanger 21 flowing medium in the medium.

The indoor heat exchanger 21 and the outdoor heat exchanger 12 are connected to the compressor 11 respectively. For example, the indoor heat exchanger 21 and the outdoor heat exchanger 12 are connected to the compressor 11 through the four-way valve 7 respectively. The second solenoid valve 52 is arranged between the four-way valve 7 and the indoor switch. in the pipeline 4 between the heaters 21, and is configured to regulate the flow rate of the flowing medium in the pipeline 4. The second stop valve 62 is provided between the second solenoid valve 52 and the indoor heat exchanger 21 , and is configured to cut off and throttle the flow medium in the pipeline 4 between the second solenoid valve 52 and the indoor heat exchanger 21 .

The indoor heat exchanger 21 includes a first communication port 211 and a second communication port 212. The first communication port 211 is connected to the first stop valve 61 , and the second communication port 212 is connected to the second stop valve 62 . The outdoor heat exchanger 12 includes a third communication port 121 and a fourth communication port 122 . The third communication port 121 is connected to the expansion valve 3 , and the fourth communication port 122 is connected to the four-way valve 7 .

The compressor 11 includes a suction port 111 and a discharge port 112. The refrigerant that has absorbed heat and undergone an evaporation process enters the compressor 11 from the suction port 111. The compressor 11 compresses the gaseous refrigerant into a high-temperature and high-pressure state, and then discharges it from the exhaust port 112.

The four-way valve 7 includes a first valve port 71 , a second valve port 72 , a third valve port 73 and a fourth valve port 74 . The first valve port 71 is fixedly connected to the suction port 111 , and the third valve port 73 is fixedly connected to the exhaust port 112 . When the air conditioner 1000 is in cooling mode, the first valve port 71 is connected to the second valve port 72 , and the third valve port 73 is connected to the fourth valve port 74 . When the air conditioner 1000 is in the heating mode, the first valve port 71 is connected to the fourth valve port 74 , and the second valve port 72 is connected to the third valve port 73 .

The air conditioner 1000 also includes an exhaust gas sensor. The exhaust sensor is disposed in the pipeline 4 between the exhaust port 112 and the third valve port 73 and is configured to measure the exhaust temperature of the compressor 11 .

The air conditioner 1000 includes a first working mode (such as cooling mode) and a second working mode (such as heating mode).

When the air conditioner 1000 operates in the first operating mode, the indoor heat exchanger 21 is used as an evaporator, and the outdoor heat exchanger 12 is used as a condenser.

The compressor 11 compresses the gaseous refrigerant into a high-temperature and high-pressure state, and discharges the high-temperature and high-pressure refrigerant gas from the exhaust port 112 . The high-temperature and high-pressure refrigerant gas enters the outdoor heat exchanger 12 through the four-way valve 7 and the fourth communication port 122, and is condensed in the outdoor heat exchanger 12 to release the heat of the refrigerant to the surrounding environment. The high-temperature and high-pressure refrigerant gas changes from gas to liquid through the condensation process, and flows into the expansion valve 3 through the third communication port 121 . The expansion valve 3 expands high-pressure liquid refrigerant into low-pressure liquid refrigerant.

The liquid refrigerant flowing out from the expansion valve 3 flows into the indoor heat exchanger 21 via the first solenoid valve 51 , the first stop valve 61 and the first communication port 211 . The low-pressure liquid refrigerant evaporates in the indoor heat exchanger 21 to exchange heat with the indoor environment, and absorbs heat to change from liquid to gas. The low-temperature and low-pressure refrigerant gas enters the compressor 11 through the second communication port 212, the second stop valve 62, the second solenoid valve 52, the four-way valve 7 and the suction port 111. The compressor 11 again compresses the refrigerant gas from a low-temperature and low-pressure state into a high-temperature and high-pressure state, and discharges the refrigerant gas from the exhaust port 112 . The high-temperature and high-pressure refrigerant gas enters the outdoor heat exchanger 12 again through the four-way valve 7 and the fourth communication port 122 , and is condensed again in the outdoor heat exchanger 12 .

In this way, when the air conditioner 1000 is operating in the first operating mode, by consuming the electric energy supplied to the compressor 11, the refrigerant flowing through the indoor heat exchanger 21 absorbs heat, thereby lowering the temperature of the indoor environment.

When the air conditioner 1000 operates in the second operating mode, the indoor heat exchanger 21 is used as a condenser and the outdoor heat exchanger 12 is used as an evaporator. The compressor 11 compresses the gaseous refrigerant into a high-temperature and high-pressure state, and discharges the high-temperature and high-pressure refrigerant gas from the exhaust port 112 . The high-temperature and high-pressure refrigerant gas enters the indoor heat exchanger 21 through the four-way valve 7, the second solenoid valve 52, the second stop valve 62 and the second communication port 212, and is condensed in the indoor heat exchanger 21 to convert the refrigeration gas into the indoor heat exchanger 21. The heat of the agent is released into the indoor environment, causing the indoor temperature to rise. The high-temperature and high-pressure refrigerant gas changes from gas to liquid through the condensation process, and flows into the expansion valve 3 through the first communication port 211 , the first stop valve 61 and the first solenoid valve 51 . The expansion valve 3 expands high-pressure liquid refrigerant into low-pressure liquid refrigerant.

The liquid refrigerant flowing out of the expansion valve 3 flows into the outdoor heat exchanger 12 via the third communication port 121 . The low-pressure liquid refrigerant evaporates in the outdoor heat exchanger 12 to absorb heat from the outdoor environment, so that the low-pressure liquid refrigerant evaporates into low-temperature and low-pressure refrigerant gas. The low-temperature and low-pressure refrigerant gas enters the compressor 11 through the fourth communication port 122 , the four-way valve 7 and the suction port 111 . The compressor 11 again compresses the refrigerant gas from a low-temperature and low-pressure state into a high-temperature and high-pressure state, and discharges the refrigerant gas from the exhaust port 112 . The high-temperature and high-pressure refrigerant gas again enters the indoor heat exchanger 21 through the four-way valve 7, the second solenoid valve 52, the second stop valve 62 and the second communication port 212 for the condensation process.

In this way, during the operation of the air conditioner 1000 in the second operating mode, by consuming the electric energy supplied to the compressor 11, The refrigerant flowing through the indoor heat exchanger 21 is dissipated to increase the temperature of the indoor environment.

In some embodiments, as shown in FIG. 4 , the air conditioner 1000 further includes a concentration sensor 8 and a controller 9 . The concentration sensor 8 is provided on the indoor unit 2 and is located at a location where refrigerant leakage is likely to occur in the indoor unit 2 . For example, the concentration sensor 8 is provided at a connection between the indoor heat exchanger 21 and the second stop valve 62 , or at a connection between the first stop valve 61 and the indoor heat exchanger 21 . The concentration sensor 8 is configured to detect a current concentration value A of the refrigerant, and send a detected signal representing the current concentration value A of the refrigerant to the controller 9 . The controller 9 is connected to the compressor 11 and the concentration sensor 8 respectively, and is configured to receive signals from the concentration sensor 8 .

FIG. 5 is a flow chart of the controller 9 of the air conditioner 1000 according to some embodiments. As shown in FIG. 5 , the controller 9 is configured to perform steps 101 to 102 .

In step 101, it is determined that refrigerant leakage occurs.

In some embodiments, as shown in FIG. 4 , the concentration sensor 8 includes a control component 81 . The control component 81 is configured to determine whether refrigerant leakage occurs based on the current concentration value A of the refrigerant detected by the concentration sensor 8, and if it is determined that the refrigerant leakage occurs, send a signal representing the refrigerant leakage to the controller 9 .

For example, when the concentration sensor 8 detects that the indoor refrigerant concentration is greater than or equal to the first concentration threshold (first leak concentration value), the control component 81 determines that the refrigerant leaks and sends a signal representing the refrigerant leak to the controller 9 . In this case, the controller 9 receives the signal representing refrigerant leakage and determines that refrigerant leakage occurs. When the concentration sensor 8 detects that the current concentration value A of the indoor refrigerant is less than the first concentration threshold, the control component 81 determines that there is no refrigerant leakage and does not send a signal representing refrigerant leakage to the controller 9 .

It should be noted that the first concentration threshold is a value preset in the control component 81, and the first concentration threshold can be adjusted according to actual needs, and this disclosure does not limit this.

For example, the first concentration threshold is less than the lowest concentration value at which the refrigerant may explode in an indoor environment. The refrigerant concentration value that does not cause explosion in the indoor environment can be obtained from experimental results.

It can be understood that by setting the first concentration threshold to be less than the lowest concentration value at which the refrigerant may explode in an indoor environment, an alarm can be issued and the refrigerant recovery mode can be executed when the refrigerant leakage is small, thereby reducing the risk of refrigerant leakage. Explosion risk from leakage.

In some embodiments, the first concentration threshold is preset in the controller 9 . The controller 9 receives a signal representing the current concentration value A of the refrigerant sent by the concentration sensor 8, and determines whether the refrigerant leaks based on the signal. For example, the concentration sensor 8 detects the current concentration value A of the refrigerant, and sends a signal representing the current concentration value A of the refrigerant to the controller 9. The controller 9 determines whether the refrigerant leaks based on the signal.

For example, when the controller 9 receives a signal representing the current concentration value A of the refrigerant sent by the concentration sensor 8, the controller 9 determines whether the current concentration value A of the refrigerant is greater than or equal to the first concentration threshold based on the signal. When the current concentration value A of the refrigerant is greater than or equal to the first concentration threshold, the controller 9 determines that the refrigerant leaks. When the current concentration value A of the refrigerant is less than the first concentration threshold, the controller determines that the refrigerant does not leak.

In step 102, the current working mode of the air conditioner 1000 is determined, and the air conditioner 1000 is controlled to run the first recovery mode or the second recovery mode according to the current working mode of the air conditioner 1000.

During the operation of the air conditioner 1000, when the controller 9 receives a signal representing the refrigerant leakage sent by the concentration sensor 8, or when the controller 9 receives a signal representing the current concentration value A of the refrigerant sent by the concentration sensor 8, When it is determined that the current concentration value A of the refrigerant is greater than or equal to the first concentration threshold, the controller 9 determines that refrigerant leakage occurs. In the case where the controller 9 determines that refrigerant leakage occurs, the controller 9 controls the air conditioner 1000 to operate the refrigerant recovery mode.

In some embodiments, the refrigerant recovery mode includes a first recovery mode and a second recovery mode. When the controller 9 determines that refrigerant leakage occurs, it determines the current working mode of the air conditioner 1000 and controls the air conditioner 1000 to run the first recovery mode or the second recovery mode according to the current working mode of the air conditioner 1000 .

For example, when the air conditioner 1000 operates in the first operating mode and the indoor heat exchanger 21 is used as an evaporator, the air conditioner 1000 simultaneously operates the first recovery mode to adjust the operating frequency of the compressor 11 to the target operating frequency F1 , and maintain the target operating frequency F1 operation to recover leaked refrigerant. When the air conditioner 1000 operates in the second operating mode, When the indoor heat exchanger 21 is used as a condenser, the air conditioner 1000 operates in the second recovery mode at the same time, so that the operating mode of the air conditioner 1000 is switched to the first operating mode, and the operating frequency of the compressor 11 is adjusted to the target operating frequency F1 , and maintain the target operating frequency F1 operation to recover leaked refrigerant.

FIG. 6 is a flow chart of a first recovery mode of the air conditioner 1000 according to some embodiments. In some embodiments, as shown in Figure 6, step 102 includes steps 201 to 205.

In step 201, it is determined whether the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1. If so, step 202 is executed. If not, step 203 is executed.

It should be noted that the target operating frequency F1 is a value preset in the controller 9, and the target operating frequency F1 can be adjusted according to actual needs, and this disclosure does not limit this. For example, the target operating frequency F1 can be tested based on experimental results, or can be calculated based on simulation experiments or theory.

When the air conditioner 1000 is operating in the refrigerant recovery mode, the compressor 11 operates at the target operating frequency F1, which can speed up the refrigerant recovery speed and keep the pressure in the pipeline 4 appropriate, thereby preventing the indoor heat exchanger 21 from speeding up. The leakage rate of residual refrigerant. For example, when the indoor heat exchanger 21 is used as an evaporator, the air conditioner 1000 is in cooling mode, and the air conditioner 1000 executes the first recovery mode, the controller 9 detects the current operating frequency F0 of the compressor 11 and determines the current operating frequency. The relationship between frequency F0 and target operating frequency F1.

In step 202, the operating frequency of the compressor 11 is controlled to reduce to the target operating frequency F1 at the frequency reduction rate V3, and then the compressor 11 is controlled to maintain operation at the target operating frequency F1.

In some embodiments, when the air conditioner 1000 operates in the first recovery mode, when the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, the controller is further configured to control the operating frequency of the compressor 11 to decrease to The target operating frequency F1 is set, and then the compressor 11 is controlled to maintain the operation of the target operating frequency F1.

It should be noted that when the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, the operating frequency of the compressor 11 is higher and the refrigerant leaks faster. Therefore, quickly reducing the operating frequency of the compressor 11 to the target operating frequency F1 is beneficial to reducing the leakage speed of the refrigerant. In addition, the air conditioner 1000 operates the refrigerant recovery mode when the compressor 11 operates at the target operating frequency F1, which is beneficial to rapid recovery of refrigerant and further reduces the leakage rate of indoor refrigerant.

For example, when the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, the controller 9 controls the operating frequency of the compressor 11 to reduce to the target operating frequency F1 at the frequency reduction rate V3. The unit of frequency reduction rate V3 is Hz/s. The frequency reduction rate V3 is a value preset in the controller 9 .

It should be noted that the operating frequency of the compressor 11 affects the refrigerant recovery speed. When the frequency of the compressor 11 is greater, the compressor 11 does more work per unit time, so that the low-temperature and low-pressure refrigerant gas entering the compressor 11 is quickly compressed into a high-temperature and high-pressure refrigerant gas, thereby making the high-temperature and high-pressure refrigerant gas The refrigerant is quickly sent to the outdoor heat exchanger 12, thereby increasing the recovery speed of the refrigerant. However, the greater the frequency of the compressor 11, the greater the pressure of the refrigerant in the pipeline 4, which leads to an accelerated leakage rate of the residual refrigerant in the indoor heat exchanger 21.

When the frequency of the compressor 11 is smaller, the compressor 11 does less work per unit time, so that the low-temperature and low-pressure refrigerant gas entering the compressor 11 is compressed into a high-temperature and high-pressure refrigerant gas at a slower speed, thereby achieving high-temperature and high-pressure refrigeration. The refrigerant gas is slowly sent into the outdoor heat exchanger 12, thereby reducing the refrigerant recovery speed. However, the smaller the operating frequency of the compressor 11 is, the smaller the pressure of the refrigerant in the pipeline 4 is, thereby reducing the leakage speed of the remaining refrigerant in the indoor heat exchanger 21 .

Therefore, when the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, the controller 9 controls the operating frequency of the compressor 11 to decrease at the frequency reduction rate V3, which can quickly reduce the frequency of the compressor 11 to the target operating frequency F1. The speed of refrigerant leakage decreases as the operating frequency of the compressor 11 decreases. The compressor 11 quickly reduces the frequency to the target operating frequency F1, which allows the refrigerant to be recovered quickly and at the same time reduces the amount of refrigerant leakage. Reduce safety hazards caused by refrigerant leakage.

In addition, the controller 9 controls the frequency of the compressor 11 to adjust to the target operating frequency F1 instead of immediately stopping the operation of the air conditioner 1000, which can avoid damage to the compressor 11 caused by sudden shutdown and help extend the service life of the air conditioner 1000.

In some embodiments, when the compressor 11 is working, its operating frequency fluctuates within a certain frequency range. The frequency interval includes a first frequency interval and a second frequency interval. Any frequency value in the first frequency interval and the second frequency interval is greater than the target operating frequency F1, and any frequency value in the first frequency interval is higher than any frequency value in the second frequency interval. A frequency value is closer to the target operating frequency F1.

In this way, when the air conditioner 1000 operates in the first recovery mode, when the controller 9 determines that the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1 and is in the first frequency interval, the controller 9 is also configured In order to control the operating frequency of the compressor 11 to reduce to the target operating frequency F1 at the frequency reduction rate V31, the compressor 11 is then controlled to maintain operation at the target operating frequency F1.

When the controller 9 determines that the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1 and is in the second frequency interval, the controller 9 is also configured to control the operating frequency of the compressor 11 to reduce to the target at the frequency reduction rate V32. The operating frequency is F1, and then the compressor 11 is controlled to maintain the operation of the target operating frequency F1.

For example, the frequency reduction rate V32 is greater than the frequency reduction rate V31.

It should be noted that when the air conditioner 1000 operates in the first recovery mode, when the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1 and the current operating frequency F0 is in the first frequency interval, the refrigerant leaks to a lower extent. In this case, the operating frequency of the compressor 11 is reduced to the target operating frequency F1 at a slower frequency reduction rate V31, which is beneficial to maintaining the stability of the air conditioner 1000 operating in the first recovery mode, and is beneficial to reducing the loss of the compressor 11 , extending the service life of the compressor 11.

When the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, and the current operating frequency F0 is in the second frequency interval, the degree of refrigerant leakage is relatively high. In this case, the operating frequency of the compressor 11 is reduced to the target operating frequency F1 at a faster frequency reduction rate V32, which can quickly reduce the frequency in a short period of time, which is beneficial to reducing the degree of refrigerant leakage and reducing refrigerant leakage. safety hazards brought about.

The frequency reduction rate V31 and the frequency reduction rate V32 are values preset in the controller 9, and the unit is Hz/s.

To sum up, when the air conditioner 1000 operates in the first recovery mode, when the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, the controller 9 determines the frequency range in which the current operating frequency F0 is located, and determines the frequency range according to The frequency interval in which the current operating frequency F0 is located obtains the corresponding frequency reduction rate, and the operating frequency of the compressor 11 is controlled to reduce to the target operating frequency F1 at the corresponding frequency reduction rate.

In step 203, it is determined whether the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1. If yes, step 204 is executed. If not, step 205 is executed.

In step 204, the operating frequency of the compressor 11 is controlled to increase to the target operating frequency F1 at the frequency increase rate V4, and then the compressor 11 is controlled to maintain operation at the target operating frequency F1.

In some embodiments, when the air conditioner 1000 operates in the first recovery mode, when the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1, the controller 9 is further configured to control the operating frequency of the compressor 11 to increase. reaches the target operating frequency F1, and then controls the compressor 11 to maintain the operation of the target operating frequency F1.

It can be understood that when the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1, the operating frequency of the compressor 11 is lower and the refrigerant leaks at a slower rate. However, the speed of refrigerant recovery is slow due to the low operating frequency of the compressor 11, which is not conducive to refrigerant recovery. That is to say, the refrigerant recovery speed increases as the frequency of the compressor 11 increases. When the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1, the controller 9 controls the operating frequency of the compressor 11 to increase to the target operating frequency F1, which is beneficial to increasing the refrigerant recovery speed.

For example, when the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1, the controller 9 controls the operating frequency of the compressor 11 to increase to the target operating frequency F1 at the frequency increase rate V4. The up-conversion rate V4 is a value preset in the controller 9, and the up-conversion rate V4 is less than or equal to the down-conversion rate V3. The unit of upconversion rate V4 is Hz/s.

Since the up-conversion rate V4 is less than or equal to the down-conversion rate V3, the compressor 11 can be up-converted slowly. The speed of refrigerant leakage increases as the operating frequency of the compressor 11 increases. The frequency increase rate V4 of the compressor 11 is smaller, which can cause the operating frequency of the compressor 11 to increase more slowly. In this way, during the process of increasing the frequency of the compressor 11, the refrigerant leaks slowly and at the same time, the recovery speed of the refrigerant is accelerated, so that the degree of refrigerant leakage is reduced, thereby reducing the safety hazard caused by the refrigerant leakage.

In some embodiments, the frequency interval further includes a third frequency interval and a fourth frequency interval. Any frequency value in the third frequency interval and the fourth frequency interval is less than the target operating frequency F1, and any frequency value in the third frequency interval is smaller than that in the fourth frequency interval. Any frequency value is closer to 0.

In this way, when the air conditioner 1000 operates in the first recovery mode, when the controller 9 determines that the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1 and is in the third frequency interval, the controller 9 is also configured In order to control the operating frequency of the compressor 11 to increase to the target operating frequency F1 at the frequency increase rate V41, the compressor 11 is then controlled to maintain operation at the target operating frequency F1. When the controller 9 determines that the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1 and is in the fourth frequency interval, the controller 9 is also configured to control the operating frequency of the compressor 11 to increase at the frequency increase rate V42 to the target operating frequency F1, and then control the compressor 11 to maintain the operation of the target operating frequency F1. For example, the upconversion rate V41 is greater than the upconversion rate V42.

It should be noted that when the air conditioner 1000 operates in the first recovery mode, when the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1 and the current operating frequency F0 is in the third frequency interval, the refrigerant leaks to a higher degree. In this case, the operating frequency of the compressor 11 is increased to the target operating frequency F1 at a faster frequency increase rate V41, which can increase the frequency quickly in a shorter period of time, which is beneficial to reducing the degree of refrigerant leakage and speeding up the refrigerant flow rate. recovery speed, thereby reducing safety hazards caused by refrigerant leakage.

When the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1 and the current operating frequency F0 is in the fourth frequency interval, the degree of refrigerant leakage is low. In this case, the operating frequency of the compressor 11 is increased to the target operating frequency F1 at a slower frequency increase rate V42, which is beneficial to maintaining the stability of the air conditioner 1000 operating in the first recovery mode, and is beneficial to reducing the stress of the compressor 11 loss and extend the service life of the compressor 11.

The upconversion rate V41 and the upconversion rate V42 are values preset in the controller 9, and the unit is Hz/s.

To sum up, when the air conditioner 1000 operates in the first recovery mode, when the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1, the controller 9 determines the frequency range in which the current operating frequency F0 is located, and determines the frequency range according to The frequency interval in which the current operating frequency F0 is located obtains a corresponding frequency increase rate, and the operating frequency of the compressor 11 is controlled to increase to the target operating frequency F1 at the corresponding frequency increase rate.

In step 205, the compressor 11 is controlled to maintain operation at the target operating frequency F1.

In some embodiments, when the air conditioner 1000 operates in the first recovery mode, when the current operating frequency F0 of the compressor 11 is equal to the target operating frequency F1, the controller 9 is further configured to control the compressor 11 to maintain the target operating frequency. F1 runs.

To sum up, when the controller 9 receives the signal representing the refrigerant leakage sent by the concentration sensor 8, or when the controller 9 receives the signal representing the current concentration value A of the refrigerant sent by the concentration sensor 8, and determines the When the current concentration value A of the refrigerant is greater than or equal to the first concentration threshold, the controller 9 determines that the refrigerant leaks, that is, the refrigerant in the indoor unit 2 leaks and diffuses into the air. In this case, the controller 9 controls the air conditioner 1000 to run the refrigerant recovery mode, so that the refrigerant in the indoor unit 2 flows through the pipeline 4 and is recovered to the outdoor unit 1 to reduce the amount of refrigerant leakage.

That is to say, when the controller 9 determines that the refrigerant leaks, the controller 9 controls the air conditioner 1000 to operate the first recovery mode or the second recovery mode, so that the refrigerant in the indoor heat exchanger 21 flows through the second stop valve 62 , the second solenoid valve 52, and the suction port 111 enter the compressor 11. The refrigerant is compressed into high-temperature and high-pressure refrigerant gas in the compressor 11 and then discharged from the exhaust port 112 to the outdoor heat exchanger 12, so that the refrigerant in the indoor heat exchanger 21 gradually decreases, so that the leakage of the refrigerant is reduced. , thereby realizing the recovery of refrigerant from the indoor heat exchanger 21 and reducing the safety hazards caused by refrigerant leakage.

FIG. 7 is a flow chart of a second recovery mode of the air conditioner 1000 according to some embodiments. In some embodiments, as shown in Figure 7, step 102 includes steps 301 to 305.

In step 301, it is determined whether the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1. If so, step 302 is executed. If not, step 303 is executed.

For example, when the indoor heat exchanger 21 is used as a condenser, the air conditioner 1000 is in heating mode, and the air conditioner 1000 runs in the second recovery mode, the controller 9 detects the current operating frequency F0 of the compressor 11 and determines the current The relationship between the operating frequency F0 and the target operating frequency F1.

In step 302, the operating frequency of the compressor 11 is controlled to reduce to the target operating frequency F1 at the frequency reduction rate V1, the four-way valve 7 is controlled to change direction, so that the air conditioner 1000 switches from the heating operating mode to the cooling operating mode, and the compressor is controlled 11 Maintain the target operating frequency F1 operation.

In some embodiments, when the air conditioner 1000 operates in the second recovery mode, when the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, the controller 9 is further configured to control the operating frequency of the compressor 11 to decrease. to the target operating frequency F1, and then control the reversal of the four-way valve 7 to switch the air conditioner 1000 to the cooling mode, so that the indoor heat exchanger 21 is used as an evaporator, and the compressor 11 is controlled to run at the target operating frequency F1 .

As mentioned above, when the air conditioner 1000 operates in the second recovery mode, the operating frequency of the compressor 11 should not be too high or too low. The air conditioner 1000 operates in the refrigerant recovery mode when the compressor 11 operates at the target operating frequency F1. , which is conducive to rapid recovery of refrigerant.

For example, when the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, the controller 9 controls the compressor 11 to reduce the frequency to the target operating frequency F1 at the frequency reduction rate V1 (first frequency reduction rate), and then controls the four-way valve 7 The reversal causes the air conditioner 1000 to switch from the heating mode to the cooling mode. The unit of the frequency reduction rate V1 is Hz/s, and is a value preset in the controller 9 . The frequency reduction rate V1 may be the same as or different from the frequency reduction rate V3, which is not limited in this disclosure.

It can be understood that when the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, the controller 9 controls the operating frequency of the compressor 11 to decrease at the frequency reduction rate V1, which can quickly reduce the frequency of the compressor 11 to the target operating frequency. F1. The speed of refrigerant leakage decreases as the operating frequency of the compressor 11 decreases. The compressor 11 quickly reduces the frequency to the target operating frequency F1, which allows the refrigerant to be recovered quickly and at the same time reduces the amount of refrigerant leakage. Reduce safety hazards caused by refrigerant leakage.

In some embodiments, the frequency interval further includes a fifth frequency interval and a sixth frequency interval. Any frequency value in the fifth frequency interval and the sixth frequency interval is greater than the target operating frequency F1, and any frequency value in the fifth frequency interval is higher than that in the sixth frequency interval. Any frequency value is closer to the target operating frequency F1. The fifth frequency interval may be the same as or different from the first frequency interval, and the sixth frequency interval may be the same as or different from the second frequency interval, which is not limited in this disclosure.

In this way, when the air conditioner 1000 operates in the second recovery mode, when the controller 9 determines that the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1 and is in the fifth frequency interval, the controller 9 is also configured In order to control the operating frequency of the compressor 11 to reduce to the target operating frequency F1 at the frequency reduction rate V11 (second frequency reduction rate), the compressor 11 is then controlled to maintain operation at the target operating frequency F1. When the controller 9 determines that the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1 and is in the sixth frequency interval, the controller 9 is also configured to control the operating frequency of the compressor 11 at a frequency reduction rate V12 (the third The frequency reduction rate) is reduced to the target operating frequency F1, and then the compressor 11 is controlled to maintain the operation of the target operating frequency F1. For example, the frequency reduction rate V12 is greater than the frequency reduction rate V11.

It should be noted that when the air conditioner 1000 operates in the second recovery mode, when the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1 and the current operating frequency F0 is in the fifth frequency interval, the refrigerant leaks to a lower extent. In this case, the operating frequency of the compressor 11 is reduced to the target operating frequency F1 at a slower frequency reduction rate V11, which is beneficial to maintaining the stability of the air conditioner 1000 operating in the second recovery mode, and is beneficial to reducing the loss of the compressor 11 , extending the service life of the compressor 11. When the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, and the current operating frequency F0 is in the sixth frequency interval, the degree of refrigerant leakage is relatively high. In this case, the operating frequency of the compressor 11 is reduced to the target operating frequency F1 at a faster frequency reduction rate V12, which can quickly reduce the frequency in a short period of time, which is beneficial to reducing the degree of refrigerant leakage and reducing refrigerant leakage. safety hazards brought about.

The frequency reduction rate V11 and the frequency reduction rate V12 are values preset in the controller 9, and the unit is Hz/s. The frequency reduction rate V11 may be the same as or different from the frequency reduction rate V31, and the frequency reduction rate V12 may be the same as or different from the frequency reduction rate V32, which is not limited in this disclosure.

To sum up, when the air conditioner 1000 operates in the second recovery mode, when the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, the controller 9 determines the frequency range in which the current operating frequency F0 is located, and determines the frequency range according to The frequency interval in which the current operating frequency F0 is located obtains the corresponding frequency reduction rate, and the operating frequency of the compressor 11 is controlled to reduce to the target operating frequency F1 at the corresponding frequency reduction rate.

In some embodiments, as shown in Figure 4, the controller 9 is connected to the four-way valve 7. The controller 9 is also configured to control the direction change of the four-way valve 7 to switch the operating condition of the air conditioner 1000 . For example, when the controller 9 controls the four-way valve 7 to change direction so that the air conditioner 1000 switches from the heating mode to the cooling mode, the first valve port 71 switches from connecting to the fourth valve port 74 to connecting to the second valve port. 72, the third valve port 73 switches from connecting to the second valve port 72 to connecting to the fourth valve port 74.

When the air conditioner 1000 operates in the second recovery mode, the air conditioner 1000 is in a heating mode, and the second communication port 212 is connected to the exhaust port 112 . The compressor 11 discharges high-temperature and high-pressure refrigerant gas to the indoor heat exchanger 21 . The indoor heat exchanger 21 is used as a condenser to condense the high-temperature and high-pressure gaseous refrigerant. The condensed refrigerant flows into the expansion valve 3 through the first communication port 211 . Since the refrigerant in the indoor heat exchanger 21 is not connected to the suction port 111, when the air conditioner 1000 is in the heating mode, the refrigerant in the indoor heat exchanger 21 cannot be extracted to the outdoors for heat exchange through the compressor 11. Device 12. That is to say, when the air conditioner 1000 is in the heating mode to recover refrigerant, the working mode needs to be switched to the cooling mode so that the air conditioner 1000 can recover the refrigerant in the cooling mode.

When the air conditioner 1000 is in cooling mode, the indoor heat exchanger 21 is used as an evaporator, and the second communication port 212 is connected to the suction port 111 . When the compressor 11 operates at the target operating frequency F1, the compressor 11 can compress the refrigerant gas that enters the indoor heat exchanger 21 through the second communication port 212 and the suction port 111 into a high-temperature and high-pressure refrigerant gas, and refrigeration The agent is discharged to the outdoor heat exchanger 12. The outdoor heat exchanger 12 is used as a condenser to condense the high-temperature and high-pressure refrigerant gas into liquid refrigerant, thereby realizing the recovery of the refrigerant from the indoor heat exchanger 21 to the outdoor heat exchanger 12 .

In addition, when the air conditioner 1000 operates in the second recovery mode and the current operating frequency F0 of the compressor 11 is greater than the target operating frequency F1, the operating frequency of the compressor 11 is relatively high at this time, and the current operating condition of the air conditioner 1000 cannot be directly switched. That is, the controller 9 cannot directly control the direction change of the four-way valve 7 to switch the air conditioner 1000 from the heating mode to the cooling mode. Instead, it is necessary to first reduce the operating frequency of the compressor 11 to the target operating frequency F1, and then reverse the direction of the four-way valve 7 to switch the air conditioner 1000 from the heating mode to the cooling mode.

In step 303, it is determined whether the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1. If yes, step 304 is executed. If not, step 305 is executed.

In step 304, the four-way valve 7 is controlled to change direction so that the air conditioner 1000 switches from the heating operating mode to the cooling operating mode, the operating frequency of the compressor 11 is controlled to increase to the target operating frequency F1 at the frequency increase rate V2, and the control The compressor 11 maintains operation at the target operating frequency F1.

In some embodiments, when the air conditioner 1000 operates in the second recovery mode, when the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1, the controller 9 is further configured to control the four-way valve 7 to reverse, In order to switch the air conditioner 1000 from the heating mode to the cooling mode, the indoor heat exchanger 21 is used as an evaporator, and then the operating frequency of the compressor 11 is controlled to increase at the frequency increase rate V2 (the first frequency increase rate). to the target operating frequency F1, and the compressor 11 is controlled to operate at the target operating frequency F1.

It can be understood that when the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1, the operating frequency of the compressor 11 is small at this time, and the controller 9 can control the four-way valve 7 to directly reverse the direction of the air conditioner 1000. Switching from the heating working mode to the cooling working mode allows the air conditioner 1000 to recover refrigerant under the cooling working mode. In this way, there is no need to adjust the operating frequency of the compressor 11 before recovering the refrigerant, which is beneficial to improving the efficiency of recovering the refrigerant and reducing the leakage speed of the refrigerant.

Therefore, when the air conditioner 1000 operates in the second recovery mode, when the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1, the controller 9 controls the four-way valve 7 to change direction so that the air conditioner 1000 switches from the heating operation to the heating operation. The operating condition is switched to the refrigeration operating condition, and then the operating frequency of the compressor 11 is controlled to increase to the target operating frequency F1 at the frequency increase rate V2.

For example, the upconversion rate V2 is a value preset in the controller 9 , and the upconversion rate V2 is less than or equal to the downconversion rate V1 . The unit of upconversion rate V2 is Hz/s. The upconversion rate V2 may be the same as or different from the upconversion rate V4, which is not limited in this disclosure.

It can be understood that the speed of refrigerant leakage increases as the operating frequency of the compressor 11 increases. The frequency increase rate of the compressor 11 is smaller, which can cause the operating frequency of the compressor 11 to increase slower, making the compression The refrigerant leakage of the machine 11 decreases as the frequency increases. Since the refrigerant recovery speed increases as the frequency of the compressor 11 increases, when the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1, the controller 9 controls the compressor 11 The operating frequency is increased to the target operating frequency F1, which can speed up the recovery rate of refrigerant.

Therefore, the frequency increase rate V2 is less than or equal to the frequency decrease rate V1, so that the compressor 11 can increase the frequency slowly. The speed of refrigerant leakage increases as the operating frequency of the compressor 11 increases. The frequency increase rate V2 of the compressor 11 is smaller, which can cause the operating frequency of the compressor 11 to increase more slowly. In this way, during the process of increasing the frequency of the compressor 11, the refrigerant leaks slowly and at the same time, the recovery speed of the refrigerant is accelerated, so that the degree of refrigerant leakage is reduced, thereby reducing the safety hazard caused by the refrigerant leakage.

In some embodiments, the frequency interval further includes a seventh frequency interval and an eighth frequency interval. Any frequency value in the seventh frequency interval and the eighth frequency interval is less than the target operating frequency F1, and any frequency value in the seventh frequency interval is smaller than any frequency value in the eighth frequency interval. A frequency value is closer to 0. The seventh frequency interval may be the same as or different from the third frequency interval, and the eighth frequency interval may be the same as or different from the fourth frequency interval, which is not limited in this disclosure.

In this way, when the air conditioner 1000 operates in the second recovery mode, when the controller 9 determines that the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1 and is in the seventh frequency interval, the controller 9 is also configured In order to control the operating frequency of the compressor 11 to increase to the target operating frequency F1 at the frequency increasing rate V21 (second increasing rate), the compressor 11 is then controlled to maintain operation at the target operating frequency F1. When the controller 9 determines that the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1 and is in the eighth frequency interval, the controller 9 is also configured to control the operating frequency of the compressor 11 at the frequency increase rate V22 (th (three frequency increase rates) to the target operating frequency F1, and then control the compressor 11 to maintain the operation of the target operating frequency F1. For example, the upconversion rate V21 is greater than the upconversion rate V22.

It should be noted that when the air conditioner 1000 operates in the second recovery mode, when the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1 and the current operating frequency F0 is in the seventh frequency interval, the refrigerant leaks to a higher degree. In this case, the operating frequency of the compressor 11 is increased to the target operating frequency F1 at a faster frequency increase rate V21, which can increase the frequency quickly in a shorter period of time, which is beneficial to reducing the degree of refrigerant leakage and speeding up the refrigerant flow rate. recovery speed, thereby reducing safety hazards caused by refrigerant leakage.

When the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1 and the current operating frequency F0 is in the eighth frequency interval, the degree of refrigerant leakage is low. In this case, the operating frequency of the compressor 11 is increased to the target operating frequency F1 at a slower frequency increase rate V22, which is beneficial to maintaining the stability of the air conditioner 1000 operating in the second recovery mode, and is beneficial to reducing the stress of the compressor 11 loss and extend the service life of the compressor 11.

The upconversion rate V21 and the upconversion rate V22 are values preset in the controller 9, and the unit is Hz/s. The upconversion rate V21 may be the same as or different from the upconversion rate V41, and the upconversion rate V22 may be the same as or different from the upconversion rate V42, which is not limited in this disclosure.

To sum up, when the air conditioner 1000 operates in the second recovery mode, when the current operating frequency F0 of the compressor 11 is less than the target operating frequency F1, the controller 9 determines the frequency range in which the current operating frequency F0 is located, and determines the frequency range according to The frequency interval in which the current operating frequency F0 is located obtains a corresponding frequency increase rate, and the operating frequency of the compressor 11 is controlled to increase to the target operating frequency F1 at the corresponding frequency increase rate.

In step 305, the compressor 11 is controlled to maintain operation at the target operating frequency F1.

In some embodiments, when the air conditioner 1000 operates in the second recovery mode, when the current operating frequency F0 of the compressor 11 is equal to the target operating frequency F1, the controller 9 is further configured to control the operating frequency of the compressor 11 to maintain Run at target operating frequency F1.

In some embodiments, when the air conditioner 1000 operates in the first recovery mode, the air conditioner 1000 is always in the cooling mode, and the controller 9 controls the operating frequency of the compressor 11 to adjust to the target operating frequency F1, and then controls the compressor 11 to adjust to the target operating frequency F1. Run at target operating frequency F1. When the air conditioner 1000 operates in the second recovery mode, the operating mode of the air conditioner 1000 switches from the heating operating mode to the cooling operating mode, and the controller 9 controls the operating frequency of the compressor 11 to adjust to the target operating frequency F1, and then controls the compressor 11Run at the target operating frequency F1.

When the air conditioner 1000 is in cooling mode and the compressor 11 operates at the target operating frequency F1, the refrigerant in the outdoor heat exchanger 12 flows into the indoor heat exchanger 21 through the first solenoid valve 51, and then passes through the second solenoid valve 52 and the compressor 11 flows into the outdoor heat exchanger 12 again. In this way, the recovered refrigerant will enter the room again for heat exchange Device 21, and leakage occurs again. Therefore, it is necessary to close the first solenoid valve 51 to cut off the source of refrigerant flowing into the indoor heat exchanger 21 so that the recovered refrigerant will not leak again.

FIG. 8 is a flow chart of the controller 9 of another air conditioner 1000 according to some embodiments. In some embodiments, as shown in FIG. 8 , when the air conditioner 1000 operates in the first recovery mode or the second recovery mode, and the air conditioner 1000 is in the cooling mode, and the compressor 11 operates at the target operating frequency F1, the controller 9 It is also configured to perform steps 401 to 408.

In step 401, the first solenoid valve 51 is controlled to close.

In some embodiments, as shown in FIG. 4 , the controller 9 is connected to the first solenoid valve 51 . The controller 9 is also configured to control opening and closing of the first solenoid valve 51 .

For example, when the air conditioner 1000 is running in the first recovery mode or the second recovery mode, and the air conditioner 1000 is in the cooling mode, and the compressor 11 is running at the target operating frequency F1, the controller 9 controls the first solenoid valve 51 to close, so that the outdoor The refrigerant in the machine 1 cannot flow to the indoor unit 2 through the first solenoid valve 51 , so that the source of the refrigerant in the indoor unit 2 can be cut off.

When the first solenoid valve 51 is closed and the source of refrigerant in the indoor unit 2 is cut off, the compressor 11 operates at the target operating frequency F1, which allows the refrigerant in the indoor unit 2 to continuously enter the compressor 11 and be used by the compressor. 11 is compressed into high-temperature and high-pressure gas, and then transported to the outdoor unit 1. In this way, while the source of the refrigerant in the indoor unit 2 is cut off, the refrigerant in the indoor unit 2 continues to decrease, so that the refrigerant leaking from the indoor unit 2 decreases, thereby reducing the safety hazard caused by refrigerant leakage.

In step 402, it is determined whether the current concentration value A meets the first concentration threshold condition. If yes, step 403 is executed. If not, step 406 is executed.

For example, the concentration sensor 8 detects the current concentration value A of the refrigerant, and sends a signal representing the current concentration value A to the controller 9 . The controller 9 receives the signal representing the current concentration value A sent by the concentration sensor 8 and determines the relationship between the current concentration value A and the first concentration threshold condition.

It should be noted that the first concentration threshold condition is preset in the controller 9 . For example, the first concentration threshold condition is that the current concentration value A is greater than 0 and less than the preset concentration threshold C, that is, the current concentration value A∈(0, C). The preset concentration threshold C is twice the second leakage concentration value B, that is, C=2B. The second leakage concentration value B is a concentration value representing refrigerant leakage preset in the controller 9 . The second leakage concentration value B is any value between 0.035kg/m ³ and 0.040kg/m ³ , for example, 0.035kg/m ³ , 0.038kg/m ³ or 0.040kg/m ³ .

The controller 9 is further configured to control the air conditioner 1000 to run the third recovery mode if it is determined that the current concentration value A satisfies the first concentration threshold condition.

A second concentration threshold condition is also preset in the controller 9, and the second concentration threshold condition is that the current concentration value A is greater than or equal to the preset concentration threshold C, that is, the current concentration value A∈[C, +∞). The controller 9 is further configured to control the air conditioner 1000 to run the fourth recovery mode if it is determined that the current concentration value A satisfies the second concentration threshold condition.

In step 403, the current temperature difference X between the current ambient temperature Th and the current coil temperature Tp is calculated.

In some embodiments, air conditioner 1000 also includes a room temperature sensor and a coil temperature sensor. The room temperature sensor is installed in the indoor unit 2 and connected to the controller 9 . The room temperature sensor is configured to measure the current ambient temperature Th of the indoor environment and send a signal representing the current ambient temperature Th to the controller 9 . The indoor heat exchanger 21 also includes a coil. The coil temperature sensor is arranged on the surface of the coil and connected to the controller 9 . The coil temperature sensor is configured to measure the current coil temperature Tp of the coil and send a signal representative of the current coil temperature Tp to the controller 9 .

When the controller 9 determines that the current concentration value A meets the first concentration threshold condition and controls the air conditioner 1000 to run the third recovery mode, the controller 9 is further configured to calculate the current temperature difference value X. The current temperature difference X is the difference between the current ambient temperature Th and the current coil temperature Tp.

For example, when the controller 9 controls the air conditioner 1000 to run the third recovery mode, the room temperature sensor will continuously send a measured signal representing the current ambient temperature Th to the controller 9, and the coil temperature sensor will measure a signal representing the current coil temperature. A signal of the tube temperature Tp is continuously sent to the controller 9 . The controller 9 calculates the current temperature difference X between the current ambient temperature Th and the current coil temperature Tp.

In step 404, it is determined whether the current temperature difference X is less than or equal to the preset temperature difference X0. If so, step 405 is executed. If not, step 401 is executed again.

For example, in the case where the controller 9 controls the air conditioner 1000 to run the third recovery mode and calculates the current temperature difference X between the current ambient temperature Th and the current coil temperature Tp, the controller 9 is also configured to determine the current temperature The relationship between the difference X and the preset temperature difference X0. The preset temperature difference value X0 is a value preset in the controller 9 and is any value between 0°C and 4°C, such as 0°C, 2°C or 4°C.

In step 405, the second solenoid valve 52 is controlled to close, and the air conditioner 1000 is controlled to stop.

In some embodiments, as shown in FIG. 4 , the controller 9 is also connected to the second solenoid valve 52 . The controller 9 is also configured to control the opening and closing of the second solenoid valve 52 .

For example, when the controller 9 controls the air conditioner 1000 to run the third recovery mode and determines that the current temperature difference X is less than or equal to the preset temperature difference X0, the controller 9 determines that refrigerant recovery is completed. In this case, the controller 9 controls the second solenoid valve 52 to close, controls the operating frequency of the compressor 11 to drop to 0, and controls the air conditioner 1000 to stop.

It can be understood that the current temperature difference X is less than or equal to the preset temperature difference X0, which means that the current coil temperature Tp is close to the current ambient temperature Th and the refrigerant content in the coil is small. Therefore, when the controller 9 determines that the current temperature difference X is less than or equal to the preset temperature difference X0, it can be determined that the refrigerant recovery has been completed. When the controller 9 determines that the refrigerant recovery has been completed, the controller 9 controls the second solenoid valve 52 to close, controls the operating frequency of the compressor 11 to drop to 0, and controls the air conditioner 1000 to stop.

It should be noted that when the air conditioner 1000 operates in the third recovery mode, the controller 9 can determine whether the refrigerant recovery is completed based on the current temperature difference X. It can be understood that when the refrigerant in the coil When the content is small, these refrigerants release less heat through heat exchange, which is not enough to cool the coil, thus making the current temperature difference X smaller.

Since the coil has thermal inertia, the temperature of the coil begins to rise only after the refrigerant recovery is completed. Therefore, when the current temperature difference X is less than or equal to the preset temperature difference X0, it can be determined that the refrigerant recovery is completed.

That is to say, when the current concentration value A meets the first concentration threshold condition, the degree of refrigerant leakage is low, and the controller 9 determines that the refrigerant recovery is completed based on the current temperature difference X being less than or equal to the preset temperature difference X0 , and control the air conditioner 1000 to turn off.

When the current temperature difference X is greater than the preset temperature difference X0, the controller 9 controls the air conditioner 1000 to maintain the cooling state, which is beneficial to extending the cooling time of the air conditioner 1000.

In step 406, the operating time of the compressor 11 is detected.

For example, when the controller 9 determines that the current concentration value A satisfies the second concentration threshold condition and controls the air conditioner 1000 to operate the fourth recovery mode, the controller 9 is further configured to detect the operating time of the compressor 11 .

In step 407, it is determined whether the running time of the compressor 11 is greater than or equal to the rated time T. If so, step 408 is executed. If not, step 401 is executed again.

For example, when the controller 9 controls the air conditioner 1000 to operate in the fourth recovery mode, the controller 9 is also configured to determine whether the operating time of the compressor 11 is greater than or equal to the rated time T.

It should be noted that the rated time T is a value preset in the controller 9 and is data measured from experimental results.

In step 408, the second solenoid valve 52 is controlled to close, and the air conditioner 1000 is controlled to stop.

For example, when the controller 9 controls the air conditioner 1000 to operate in the fourth recovery mode, the degree of refrigerant leakage is relatively high. In this case, when the controller 9 controls the compressor 11 to run at the target operating frequency F1 for the rated time T, and determines that the operating time of the compressor 11 is greater than or equal to the rated time T, the controller 9 determines that the refrigerant recovery process has been completed. . When the air conditioner 1000 operates in the fourth recovery mode and the controller 9 determines that the refrigerant recovery process has been completed, the controller 9 controls the second solenoid valve 52 to close, controls the operating frequency of the compressor 11 to drop to 0, and controls The air conditioner 1000 is shut down.

In some embodiments, when refrigerant leaks, the current concentration value A detected by the concentration sensor 8 fluctuates within a certain concentration threshold interval. The concentration threshold interval includes a first concentration threshold interval and a second concentration threshold interval. Any concentration value in the first concentration threshold interval and the second concentration threshold interval is greater than twice the leakage concentration value B, and Any concentration value in the first concentration threshold interval is closer to twice the leakage concentration value B than any concentration value in the second concentration threshold interval.

In this way, when the controller 9 controls the air conditioner 1000 to run the fourth recovery mode and the current concentration value A is in the first concentration threshold interval, the controller 9 is also configured to control the compressor 11 to run at the target operating frequency F1 for a rated time. T1. When the controller 9 controls the air conditioner 1000 to run the fourth recovery mode and the current concentration value A is in the second concentration threshold interval, the controller 9 is also configured to control the compressor 11 to run at the target operating frequency F1 for a rated time T2. For example, the rated time T1 is smaller than the rated time T2.

It should be noted that when the air conditioner operates in the fourth recovery mode, when the current concentration value A is in the first concentration threshold interval, the degree of refrigerant leakage is low. In this case, the compressor 11 operates at the target operating frequency F1 for the rated time T1, which can complete the recovery of refrigerant in a short period of time, which is beneficial to energy saving. When the current concentration value A is in the second concentration threshold interval, the degree of refrigerant leakage is relatively high. In this case, the compressor 11 operates at the target operating frequency F1 for the rated time T2, which can achieve more complete refrigerant recovery and reduce safety risks caused by refrigerant leakage.

The rated time T1 and the rated time T2 are values preset in the controller 9 .

To sum up, when the controller 9 determines that the current concentration value A meets the second preset concentration threshold condition and controls the air conditioner 1000 to run the fourth recovery mode, the controller 9 determines the concentration threshold interval in which the current concentration value A is located. , and obtain the corresponding rated time according to the concentration threshold interval in which the current concentration value A is located, and control the compressor 11 to run at the target operating frequency F1 for the corresponding rated time.

In some embodiments, when the air conditioner 1000 operates in the first recovery mode or the second recovery mode, and the air conditioner 1000 is in the cooling mode and the compressor 11 operates at the target operating frequency F1, the controller 9 controls the first solenoid valve 51 Close to prevent refrigerant from flowing into the indoor heat exchanger 21, thereby reducing refrigerant leakage. However, the first solenoid valve 51 may be damaged. When the first solenoid valve 51 is damaged and cannot be closed, the refrigerant flows into the indoor heat exchanger 21, causing the refrigerant to continue leaking. In this case, the expansion valve 3 can be controlled to close to cut off the source of refrigerant in the indoor heat exchanger 21 .

As shown in FIG. 9 , after step 402 and before step 403 , the controller 9 is further configured to perform steps 402A to 402C.

In step 402A, the current opening Sn of the expansion valve 3 is detected.

As shown in Figure 4, the controller 9 is connected to the expansion valve 3. The controller 9 is also configured to detect the current opening Sn of the expansion valve 3 . For example, when the controller 9 determines that the current concentration value A meets the first concentration threshold condition and controls the air conditioner 1000 to run the third recovery mode, the controller 9 detects the current opening Sn of the expansion valve 3 .

In step 402B, the adjustment rate V when the expansion valve 3 is adjusted from the current opening Sn to the target opening S0 within the valve adjustment time Tx is calculated.

In some embodiments, the controller 9 presets the target opening S0 and the valve adjustment time Tx. The controller 9 is also configured to calculate the adjustment rate V when the expansion valve 3 is adjusted from the current opening Sn to the target opening S0 within the valve adjustment time Tx.

For example, when the current opening difference between the current opening Sn and the target opening S0 is S1, the adjustment rate V is the ratio of the current opening difference S1 to the valve adjustment time Tx.

In step 402C, the expansion valve 3 is controlled to adjust the opening to the target opening S0 at the adjustment rate V within the valve adjustment time Tx.

For example, when the adjustment rate V is calculated, the controller 9 is further configured to control the expansion valve 3 to adjust the opening to the target opening S0 at the adjustment rate V within the valve adjustment time Tx.

When the current opening Sn is greater than the target opening S0, since the expansion valve 3 is connected to the pipeline 4 where the refrigerant flows from the outdoor heat exchanger 12 to the indoor heat exchanger 21, the controller 9 controls the expansion valve 3 to change from the current opening to the indoor heat exchanger 21. By adjusting Sn to the target opening S0, the flow rate of the refrigerant flowing from the outdoor unit 1 to the indoor unit 2 can be reduced, so that the inflow amount of refrigerant in the indoor heat exchanger 21 is smaller than the outflow amount of the refrigerant, thereby making the indoor heat exchanger The total amount of refrigerant within 21 hours is continuously reduced, realizing refrigerant recovery.

When the current opening Sn is equal to the target opening S0, the controller 9 controls the opening of the expansion valve 3 to remain unchanged.

When the current opening Sn is smaller than the target opening S0, since the expansion valve 3 is connected to the pipeline 4 where the refrigerant flows from the outdoor heat exchanger 12 to the indoor heat exchanger 21, the controller 9 controls the expansion valve 3 to change from the current opening to the indoor heat exchanger 21. Sn is adjusted to the target opening S0, In this way, the opening of the expansion valve 3 can be increased to speed up the recovery speed of the refrigerant.

It should be noted that the greater the ratio of the liquid refrigerant in the air conditioner 1000 to the total amount of refrigerant, the greater the risk of liquid shock in the compressor 11. Increasing the opening of the expansion valve 3 can reduce the amount of liquid refrigeration in the air conditioner 1000. The proportion of the agent can reduce the risk of liquid shock in the compressor 11.

Since the expansion valve 3 is connected between the third communication port 121 and the first communication port 211, the controller 9 controls the opening of the expansion valve 3 to adjust according to the adjustment rate V, so that the outdoor heat exchanger can be gradually reduced within the valve adjustment time Tx. 12 The flow rate of the refrigerant delivered to the indoor heat exchanger 21 avoids the impact on the air conditioning system caused by the sudden closing of the expansion valve 3, thereby shortening the service life of the air conditioner 1000.

When the third recovery mode is completed, the controller 9 is also configured to control the expansion valve 3 to adjust from the target opening S0 to closed, that is, to control the opening of the expansion valve 3 to zero to cut off the refrigeration in the indoor heat exchanger 21 Therefore, the refrigerant flowing out from the third communication port 121 is blocked by the closed expansion valve 3 and cannot flow into the indoor heat exchanger 21, thereby preventing the recovered refrigerant from entering the indoor heat exchanger 21 again and leaking again.

Because the controller 9 controls the first solenoid valve 51 to close before the air conditioner 1000 runs the third recovery mode, and controls the expansion valve 3 to close after the third recovery mode is completed. That is, the flow path through which the outdoor heat exchanger 12 delivers refrigerant to the indoor heat exchanger 21 is closed by the expansion valve 3 and the first solenoid valve 51 together. In this way, the refrigerant in the outdoor heat exchanger 12 cannot flow to the indoor heat exchanger 21 , which is helpful to avoid the situation that the refrigerant cannot be intercepted due to damage to either the expansion valve 3 or the first solenoid valve 51 .

Those skilled in the art will understand that the disclosed scope of the present invention is not limited to the specific embodiments described above, and that certain elements of the embodiments may be modified and replaced without departing from the spirit of the application. The scope of the application is limited by the appended claims.

Claims (20)

1. An air conditioner, including:

   indoor heat exchanger;

   outdoor heat exchanger;

   a compressor configured to compress the gaseous refrigerant;

   a concentration sensor, arranged indoors and configured to detect the current concentration value of the refrigerant in the indoor environment; and

   Controller, configured as:

   When the current concentration value of the refrigerant detected by the concentration sensor is greater than or equal to the preset first leakage concentration value, and the indoor heat exchanger works as an evaporator, the air conditioner is controlled to run the first recovery mode; and

   When the current concentration value of the refrigerant detected by the concentration sensor is greater than or equal to the preset first leakage concentration value, and the indoor heat exchanger works as a condenser, the air conditioner is controlled to run the second recovery model.
2. The air conditioner according to claim 1, wherein the first recovery mode includes:

   The controller detects the current operating frequency of the compressor;

   When the current operating frequency is greater than the target operating frequency, the controller controls the operating frequency of the compressor to reduce to the target operating frequency, and controls the compressor to operate at the target operating frequency; and

   When the current operating frequency is less than the target operating frequency, the controller controls the operating frequency of the compressor to increase to the target operating frequency, and controls the compressor to operate at the target operating frequency.
3. The air conditioner according to claim 1 or 2, further comprising a four-way valve connected to the controller, and the indoor heat exchanger and the outdoor heat exchanger are connected to each other through the four-way valve respectively. The compressor connection;

   The second recycling mode includes:

   The controller detects the current operating frequency of the compressor;

   When the current operating frequency is greater than the target operating frequency, the controller controls the operating frequency of the compressor to reduce to the target operating frequency, controls the compressor to operate at the target operating frequency, and controls the The four-way valve is reversed to make the indoor heat exchanger work as the evaporator; and

   When the current operating frequency is less than the target operating frequency, the controller controls the four-way valve to reverse direction so that the indoor heat exchanger works as the evaporator, and controls the operating frequency of the compressor to increase. up to the target operating frequency, and controls the compressor to operate at the target operating frequency.
4. The air conditioner according to claim 3, wherein when the controller controls the air conditioner to operate the first recovery mode or the second recovery mode, the controller is further configured to:

   When the current operating frequency is greater than the target operating frequency, control the operating frequency of the compressor to reduce to the target operating frequency at a first frequency reduction rate; and

   When the current operating frequency is less than the target operating frequency, control the operating frequency of the compressor to increase to the target operating frequency at a first frequency increase rate;

   Wherein, the first up-conversion rate is less than or equal to the first down-conversion rate.
5. The air conditioner according to claim 3, wherein the concentration sensor includes a control component, the first leakage concentration value is preset in the control component; the control component is configured to when the concentration sensor detects When the current concentration value of the refrigerant is greater than or equal to the first leakage concentration value, send a signal representing refrigerant leakage to the controller;

   The controller is further configured to receive the signal representing refrigerant leakage, determine that refrigerant leakage occurs, and control the air conditioner to operate the first recovery mode or the second recovery mode.
6. The air conditioner according to claim 3, wherein the first leakage concentration value is preset in the controller; the concentration sensor is further configured to send a value representing the current concentration value of the refrigerant to the controller. Signal;

   The controller is further configured to determine that the refrigerant leaks when the current concentration value of the refrigerant detected by the concentration sensor is greater than or equal to the first leakage concentration value, and control the air conditioner to operate the first leakage concentration value. a recycling mode or the second recycling mode.
7. The air conditioner according to claim 1, further comprising:

   Four-way valve;

   Expansion valve;

   Pipelines, the indoor heat exchanger, the outdoor heat exchanger, the compressor, the four-way valve and the expansion valve are connected through the pipelines;

   A first solenoid valve, the first solenoid valve is disposed on the pipeline between the expansion valve and the indoor heat exchanger, and is configured to regulate all connections between the expansion valve and the indoor heat exchanger. The flow rate of the flowing medium in the pipeline; and

   A first stop valve, the first stop valve is provided on the pipeline between the first solenoid valve and the indoor heat exchanger, and is configured to cut off and throttle the first solenoid valve and the indoor heat exchanger. The flow medium in the pipeline between heat exchangers.
8. The air conditioner according to claim 7, further comprising:

   A second solenoid valve, the second solenoid valve is disposed on the pipeline between the four-way valve and the indoor heat exchanger, and is configured to regulate the relationship between the four-way valve and the indoor heat exchanger. the flow rate of the flowing medium in the pipeline, and

   A second stop valve, the second stop valve is provided on the pipeline between the second solenoid valve and the indoor heat exchanger, and is configured to cut off and throttle the second solenoid valve and the indoor heat exchanger. The flow medium in the pipeline between heat exchangers;

   Wherein, the first solenoid valve and the second solenoid valve are respectively connected to the controller.
9. The air conditioner according to claim 8, wherein the indoor heat exchanger includes a first communication port and a second communication port, the first communication port is connected to the first stop valve, and the second communication port is connected to the second stop valve; the outdoor heat exchanger includes a third communication port and a fourth communication port, the third communication port is connected to the expansion valve, and the fourth communication port is connected to the four-way valve connection.
10. The air conditioner according to any one of claims 3 to 9, wherein the four-way valve includes a first valve port, a second valve port, a third valve port and a fourth valve port, and the compressor includes a a suction port connected to the first valve port and an exhaust port connected to the third valve port;

    When the indoor heat exchanger works as an evaporator, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port;

    When the indoor heat exchanger works as a condenser, the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port.
11. An air conditioner including:

    indoor heat exchanger;

    outdoor heat exchanger;

    compressor;

    Expansion valve;

    A first solenoid valve is provided on the pipeline between the expansion valve and the indoor heat exchanger, and is configured to regulate the flowing medium in the pipeline between the expansion valve and the indoor heat exchanger. flow;

    a concentration sensor configured to detect a current concentration value of the refrigerant in the indoor environment; and

    Controller, configured as:

    When the indoor heat exchanger works as an evaporator and the compressor operates at the target operating frequency, control the first solenoid valve to close; and

    When the current concentration value of the refrigerant detected by the concentration sensor is less than the preset concentration threshold, the current opening of the expansion valve is detected, and the expansion valve is controlled to adjust the speed within the preset valve adjustment time. Adjust to the preset target opening;

    Wherein, the adjustment rate is the ratio of the difference between the current opening degree and the target opening degree and the valve adjustment time.
12. The air conditioner according to claim 11, wherein the controller is connected to the concentration sensor, the compressor, the expansion valve and the first solenoid valve respectively;

    A second leakage concentration value is preset in the controller, and the controller is further configured to: when the current concentration value of the refrigerant detected by the concentration sensor is greater than or equal to the second leakage concentration value, Determine refrigerant leakage;

    Wherein, the preset concentration threshold is twice the second leakage concentration value.
13. The air conditioner of claim 12, wherein the indoor heat exchanger includes a coil;

    The air conditioner also includes:

    a room temperature sensor configured to measure the current ambient temperature in the room and send a signal representative of the current ambient temperature to the controller; and

    a coil temperature sensor configured to measure a current coil temperature of the coil and send a signal representative of the current coil temperature to the controller;

    The controller is also configured to:

    When the current concentration value of the refrigerant detected by the concentration sensor is less than the preset concentration threshold, calculate the current temperature difference between the current ambient temperature and the current coil temperature; and

    When the current temperature difference is less than or equal to the preset preset temperature difference, it is determined that refrigerant recovery is completed.
14. The air conditioner according to claim 13, wherein the controller is further configured to:

    When the current concentration value of the refrigerant detected by the concentration sensor is greater than or equal to the preset concentration threshold, detect the running time of the compressor; and

    When the running time of the compressor is greater than or equal to the preset rated time, it is determined that refrigerant recovery is completed.
15. The air conditioner according to claim 14, wherein when the controller determines that refrigerant recovery is completed, the controller is further configured to control the expansion valve to adjust from the target opening to closed.
16. The air conditioner according to claim 11, further comprising:

    Pipelines, the indoor heat exchanger, the outdoor heat exchanger, the compressor and the expansion valve are connected through the pipelines;

    A first stop valve, the first stop valve is provided on the pipeline between the first solenoid valve and the indoor heat exchanger, and is configured to cut off and throttle the first solenoid valve and the indoor heat exchanger. The flow medium in the pipeline between heat exchangers.
17. The air conditioner according to claim 16, further comprising:

    A four-way valve, the indoor heat exchanger and the outdoor heat exchanger are respectively connected to the compressor through the four-way valve;

    A second solenoid valve, the second solenoid valve is disposed on the pipeline between the four-way valve and the indoor heat exchanger, and is configured to regulate the relationship between the four-way valve and the indoor heat exchanger. the flow rate of the flowing medium in the pipeline, and

    A second stop valve, the second stop valve is provided on the pipeline between the second solenoid valve and the indoor heat exchanger, and is configured to cut off and throttle the second solenoid valve and the indoor heat exchanger. The flow medium in the pipeline between heat exchangers.
18. The air conditioner according to claim 17, wherein the four-way valve includes a first valve port, a second valve port, a third valve port and a fourth valve port, and the compressor includes a valve connected to the first valve port. The connected suction port and the exhaust port connected to the third valve port;

    When the indoor heat exchanger works as an evaporator, the first valve port is connected to the second valve port, and the third valve port is connected to the fourth valve port;

    When the indoor heat exchanger works as a condenser, the first valve port is connected to the fourth valve port, and the second valve port is connected to the third valve port.
19. The air conditioner according to claim 17, wherein the second solenoid valve is connected to the controller;

    When the controller determines that refrigerant recovery is completed, the controller is further configured to control the second solenoid valve to close and control the air conditioner to shut down.
20. The air conditioner according to any one of claims 17 to 19, wherein the indoor heat exchanger includes a first communication port and a second communication port, and the first communication port is connected to the first stop valve, The second communication port is connected to the second stop valve; the outdoor heat exchanger includes a third communication port and a fourth communication port, the third communication port is connected to the expansion valve, and the fourth communication port The port is connected to the four-way valve.