Air conditioner and control method

Abstract

The present invention discloses an air conditioner and a control method. The air conditioner comprises a pressure relief pipe, one end of which is connected to a pipeline between a coarse stop valve and a four-way valve, and the other end of which is connected to a pipeline between a throttle valve and a fine stop valve. A pressure relief valve is arranged on the pressure relief pipe. A controller is configured as follows: if it is detected that the air conditioner is in a cooling mode and the temperature difference between the coil temperature and the indoor ambient temperature is not greater than a preset difference, the operating time after the compressor is started is obtained; if the operating time reaches a first time, the pressure relief valve and the compressor are controlled according to the operating time and the exhaust temperature; wherein the first time is not less than each time within a first time range, and each time within the first time range is greater than zero and not greater than a first preset time, thereby avoiding explosion of the compressor when refrigerant is recovered, thereby improving the safety of the air conditioner.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and more specifically, to an air conditioner and a control method. Background Art

[0002] At present, the air conditioner outdoor unit is repaired and the Freon is recycled or the installation is improperly performed, the fine stop valve is completely closed, the coarse stop valve leaks into the air, the exhaust pressure of the compressor is too high when it runs for a long time, and the compressor body contains refrigerant oil. Under high temperature and high pressure, the pressure is prone to surge, which can easily lead to the risk of explosion of the compressor.

[0003] Therefore, how to provide an air conditioner that can prevent the compressor from exploding when recovering the refrigerant is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The invention provides an air conditioner, which is used to solve the technical problem in the prior art that a compressor is prone to explode when refrigerant is recovered.

[0005] The air conditioner includes:

[0006] A refrigerant circulation loop, wherein the refrigerant circulates in a loop consisting of a compressor, a condenser, a throttle valve, a fine stop valve, an evaporator, a coarse stop valve and a four-way valve, wherein the fine stop valve is used to control the refrigerant to be transported between an outdoor heat exchanger and an indoor heat exchanger, and the coarse stop valve is used to control the refrigerant to be transported between the indoor heat exchanger and the four-way valve;

[0007] The air conditioner also includes:

[0008] A pressure relief pipe, one end of which is connected to the pipeline between the coarse stop valve and the four-way valve, and the other end of which is connected to the pipeline between the throttle valve and the fine stop valve, and a pressure relief valve is provided on the pressure relief pipe;

[0009] Internal coil temperature sensor, used to detect the coil temperature of the indoor heat exchanger;

[0010] Indoor ambient temperature sensor, used to detect indoor ambient temperature;

[0011] Exhaust temperature sensor, used to detect the exhaust temperature of the compressor;

[0012] The controller is configured as:

[0013] If it is detected that the air conditioner is in cooling mode and the temperature difference between the coil temperature and the indoor ambient temperature is not greater than a preset difference, obtaining the running time of the compressor after starting;

[0014] If the operating time reaches a first time, controlling the pressure relief valve and the compressor according to the operating time and the exhaust temperature;

[0015] The first duration is not less than each duration within a first duration range, and each duration within the first duration range is greater than zero and not greater than a first preset duration.

[0016] In some embodiments of the present application, the controller is specifically configured as follows:

[0017] If the operating time reaches a second time and the exhaust temperature is not less than any temperature within the first temperature range, opening the pressure relief valve;

[0018] If the pressure relief valve is in an open state and the operating time reaches a third time and the exhaust temperature is not less than any temperature within the first temperature range, the compressor is powered off and stopped and an alarm is issued;

[0019] Among them, the first difference between the second time length and the first time length is not greater than each time length within the second time length range, each time length within the second time length range is greater than zero and not greater than a second preset time length, the second difference between the third time length and the first difference is not greater than each time length within the second time length range, the second preset time length is less than the first preset time length, and each temperature within the first temperature range is not less than the first preset temperature.

[0020] In some embodiments of the present application, the controller is further configured to:

[0021] If the pressure relief valve is in an open state and the operating time reaches the third time and the exhaust temperature is lower than any temperature in the first temperature range, reducing the operating frequency of the compressor at a preset rate until reaching a preset minimum operating frequency;

[0022] Wherein, the preset minimum operating frequency is greater than zero and less than the first frequency.

[0023] In some embodiments of the present application, the controller is further configured to:

[0024] After the operating frequency is reduced to the preset minimum operating frequency, if the exhaust temperature is greater than each temperature in the second temperature range and less than each temperature in the third temperature range, the compressor is controlled to be powered off and stopped and an alarm is issued;

[0025] After the operating frequency is reduced to the preset minimum operating frequency, if the exhaust temperature is not greater than any temperature within the second temperature range, an alarm is issued;

[0026] Among them, each temperature in the second temperature range is greater than the second preset temperature and less than each temperature in the third temperature range, each temperature in the third temperature range is greater than the third preset temperature and not greater than each temperature in the first temperature range, the second preset temperature is less than the third preset temperature, and the third preset temperature is less than the first preset temperature.

[0027] In some embodiments of the present application, the controller is further configured to:

[0028] After the compressor is controlled to be powered off and shut down and an alarm is issued, the pressure relief valve is closed.

[0029] The present invention also proposes a control method for an air conditioner, which is applied to the air conditioner as described above, and the method comprises:

[0030] If it is detected that the air conditioner is in cooling mode and the temperature difference between the coil temperature and the indoor ambient temperature is not greater than a preset difference, obtaining the running time of the compressor after starting;

[0031] If the operating time reaches a first time, controlling the pressure relief valve and the compressor according to the operating time and the exhaust temperature;

[0032] The first duration is not less than each duration within a first duration range, and each duration within the first duration range is greater than zero and not greater than a first preset duration.

[0033] In some embodiments of the present application, the pressure relief valve and the compressor are controlled according to the operating time and the exhaust temperature, specifically:

[0034] If the operating time reaches a second time and the exhaust temperature is not less than any temperature within the first temperature range, opening the pressure relief valve;

[0035] If the pressure relief valve is in an open state and the operating time reaches a third time and the exhaust temperature is not less than any temperature within the first temperature range, the compressor is powered off and stopped and an alarm is issued;

[0036] Among them, the first difference between the second time length and the first time length is not greater than each time length within the second time length range, each time length within the second time length range is greater than zero and not greater than a second preset time length, the second difference between the third time length and the first difference is not greater than each time length within the second time length range, the second preset time length is less than the first preset time length, and each temperature within the first temperature range is not less than the first preset temperature.

[0037] In some embodiments of the present application, the method further includes:

[0038] If the pressure relief valve is in an open state and the operating time reaches the third time and the exhaust temperature is lower than any temperature in the first temperature range, reducing the operating frequency of the compressor at a preset rate until reaching a preset minimum operating frequency;

[0039] Wherein, the preset minimum operating frequency is greater than zero and less than the first frequency.

[0040] In some embodiments of the present application, after the operating frequency is reduced to the preset minimum operating frequency, the method further includes:

[0041] If the exhaust temperature is greater than the temperatures within the second temperature range and less than the temperatures within the third temperature range, the compressor is powered off and stopped and an alarm is issued;

[0042] If the exhaust temperature is not greater than any temperature within the second temperature range, an alarm is issued;

[0043] Among them, each temperature in the second temperature range is greater than the second preset temperature and less than each temperature in the third temperature range, each temperature in the third temperature range is greater than the third preset temperature and not greater than each temperature in the first temperature range, the second preset temperature is less than the third preset temperature, and the third preset temperature is less than the first preset temperature.

[0044] In some embodiments of the present application, after controlling the compressor to shut down and issue an alarm, the method further includes:

[0045] Close the pressure relief valve.

[0046] By applying the above technical solution, the air conditioner includes a pressure relief pipe, one end of which is connected to the pipeline between the coarse stop valve and the four-way valve, and the other end is connected to the pipeline between the throttle valve and the fine stop valve. The pressure relief pipe is provided with a pressure relief valve, and the controller is configured as follows: if it is detected that the air conditioner is in cooling mode and the temperature difference between the coil temperature and the indoor ambient temperature is not greater than the preset difference, the operating time after the compressor is started is obtained; if the operating time reaches a first time, the pressure relief valve and the compressor are controlled according to the operating time and the exhaust temperature; wherein the first time is not less than each time within a first time range, and each time within the first time range is greater than zero and not greater than the first preset time, thereby avoiding explosion of the compressor during refrigerant recovery and improving the safety of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 A schematic structural diagram of an air conditioner proposed in an embodiment of the present invention is shown;

[0049] Figure 2 A schematic flow chart of a method for controlling an air conditioner according to an embodiment of the present invention is shown;

[0050] Figure 3 A schematic flow chart of a method for controlling an air conditioner according to another embodiment of the present invention is shown.

[0051] Figure 1 Among them, 10, outdoor unit; 110, compressor; 120, outdoor heat exchanger; 130, throttle valve; 140, fine stop valve; 150, coarse stop valve; 160, four-way valve; 170, exhaust temperature sensor; 180, pressure relief pipe; 181, pressure relief valve; 20, indoor unit; 210, indoor heat exchanger; 220, inner disk temperature sensor; 230, indoor ambient temperature sensor. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In the present application, the air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, a throttle valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies a refrigerant (i.e., a coolant) to the air that has been conditioned and heat exchanged.

[0056] The compressor compresses the refrigerant gas in a high temperature and high pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0057] The throttle valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the throttle valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the whole cycle, the air conditioner can adjust the temperature of the indoor space.

[0058] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and a throttle valve may be provided in the indoor unit or the outdoor unit.

[0059] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0060] The present application embodiment provides an air conditioner, such as Figure 1 As shown, including:

[0061] The refrigerant circulation loop allows the refrigerant to circulate in a loop consisting of the compressor 110, the condenser, the throttle valve 130, the fine stop valve 140, the evaporator, the rough stop valve 150 and the four-way valve 160. The fine stop valve 140 is used to control the refrigerant to be transported between the outdoor heat exchanger 120 and the indoor heat exchanger 210, and the rough stop valve 150 is used to control the refrigerant to be transported between the indoor heat exchanger 210 and the four-way valve 160.

[0062] The outdoor heat exchanger 120 and the indoor heat exchanger 210, wherein one works as a condenser and the other works as an evaporator;

[0063] A pressure relief pipe 180, one end of which is connected to the pipeline between the rough stop valve 150 and the four-way valve 160, and the other end of which is connected to the pipeline between the throttle valve 130 and the fine stop valve 140. A pressure relief valve 181 is provided on the pressure relief pipe 180;

[0064] The internal coil temperature sensor 220 is used to detect the coil temperature of the indoor heat exchanger 210;

[0065] An indoor ambient temperature sensor 230 is used to detect the indoor ambient temperature;

[0066] An exhaust temperature sensor 170 for detecting the exhaust temperature of the compressor 110;

[0067] In this embodiment, a pressure relief pipe 180 is added on the basis of the traditional air-conditioning system, and a pressure relief valve 181 is arranged on the pressure relief pipe 180. The pressure relief valve 181 can be opened and closed by a controller. The compressor 110, the outdoor heat exchanger 120, the throttle valve 130, the fine stop valve 140, the coarse stop valve 150, the four-way valve 160, the exhaust temperature sensor 170, the pressure relief pipe 180, and the pressure relief valve 181 are located in the outdoor unit 10, and the indoor heat exchanger 210, the inner disk temperature sensor 220, and the indoor ambient temperature sensor 230 are located in the indoor unit 20.

[0068] The controller is configured as:

[0069] If it is detected that the air conditioner is in cooling mode and the temperature difference between the coil temperature and the indoor ambient temperature is not greater than a preset difference, obtaining the running time of the compressor after starting;

[0070] If the operating time reaches a first time, controlling the pressure relief valve and the compressor according to the operating time and the exhaust temperature;

[0071] The first duration is not less than each duration within a first duration range, and each duration within the first duration range is greater than zero and not greater than a first preset duration.

[0072] In this embodiment, the controller may be an outdoor unit controller, and the controller is connected to at least the compressor, the exhaust temperature sensor, the pressure relief valve, the inner disk temperature sensor, and the indoor ambient temperature sensor. Refrigerant recovery is performed in the cooling mode, and the fine stop valve is closed or blocked in advance. If it is detected that the temperature difference between the coil temperature and the indoor ambient temperature is not greater than the preset difference, it means that the refrigerant has been recovered to the outdoor unit, and the coil temperature and the indoor ambient temperature are consistent. At this time, if the operating time after the compressor is started reaches the first time, the pressure relief valve and the compressor are controlled according to the operating time and the exhaust temperature.

[0073] Optionally, the preset difference may be 0° C. or 1° C., and the first preset time length may be 2 minutes.

[0074] In order to reliably avoid explosion of the compressor, in some embodiments of the present application, the controller is specifically configured as follows:

[0075] If the operating time reaches a second time and the exhaust temperature is not less than any temperature within the first temperature range, opening the pressure relief valve;

[0076] If the pressure relief valve is in an open state and the operating time reaches a third time and the exhaust temperature is not less than any temperature within the first temperature range, the compressor is powered off and stopped and an alarm is issued;

[0077] Among them, the first difference between the second time length and the first time length is not greater than each time length within the second time length range, each time length within the second time length range is greater than zero and not greater than a second preset time length, the second difference between the third time length and the first difference is not greater than each time length within the second time length range, the second preset time length is less than the first preset time length, and each temperature within the first temperature range is not less than the first preset temperature.

[0078] In this embodiment, as the compressor operating time increases, the exhaust pressure continues to rise and the exhaust temperature continues to increase. If the operating time reaches the second time and the exhaust temperature is not less than the temperatures within the first temperature range, it means that the exhaust temperature is too high and the exhaust pressure is too high, which may easily cause an explosion. The pressure relief valve is opened, and the throttled refrigerant re-enters the compressor for cooling, thereby reducing the exhaust temperature.

[0079] If the pressure relief valve is in the open state and the operating time reaches the third time and the exhaust temperature is not less than the temperatures in the first temperature range, it means that even if the pressure relief valve is opened, the exhaust temperature is still too high and there is a risk of explosion. The compressor is controlled to cut off power and stop and issue an alarm to notify maintenance personnel to quickly recover the refrigerant again.

[0080] Optionally, the second preset time length may be 1 minute, and the first preset temperature may be 100° C.

[0081] In order to reliably avoid explosion of the compressor, in some embodiments of the present application, the controller is further configured as follows:

[0082] If the pressure relief valve is in an open state and the operating time reaches the third time and the exhaust temperature is lower than any temperature within the first temperature range, the operating frequency of the compressor is reduced at a preset rate until a preset minimum operating frequency is reached.

[0083] In this embodiment, if the pressure relief valve is in the open state and the operating time reaches the third time and the exhaust temperature is lower than the temperatures in the first temperature range, it means that the exhaust temperature is not too high at this time, and the operating frequency of the compressor is reduced until the preset minimum operating frequency is reached to reduce the exhaust pressure increase, wherein the preset minimum operating frequency is greater than zero and less than the first frequency. Optionally, the first frequency is 80Hz.

[0084] In order to reliably avoid explosion of the compressor, in some embodiments of the present application, the controller is further configured as follows:

[0085] After the operating frequency is reduced to the preset minimum operating frequency, if the exhaust temperature is greater than each temperature in the second temperature range and less than each temperature in the third temperature range, the compressor is controlled to be powered off and stopped and an alarm is issued;

[0086] After the operating frequency is reduced to the preset minimum operating frequency, if the exhaust temperature is not greater than any temperature within the second temperature range, an alarm is issued;

[0087] Among them, each temperature in the second temperature range is greater than the second preset temperature and less than each temperature in the third temperature range, each temperature in the third temperature range is greater than the third preset temperature and not greater than each temperature in the first temperature range, the second preset temperature is less than the third preset temperature, and the third preset temperature is less than the first preset temperature.

[0088] In this embodiment, after the operating frequency is reduced to the preset minimum operating frequency, if the exhaust temperature is greater than the temperatures in the second temperature range and less than the temperatures in the third temperature range, it means that the exhaust temperature is still too high and there is a risk of explosion. It is necessary to control the compressor to cut off power and stop and issue an alarm to notify maintenance personnel to quickly recover the refrigerant again.

[0089] If the exhaust temperature is not greater than the temperatures within the second temperature range, it means that the exhaust temperature is not high and the possibility of explosion is small. At this time, the compressor may not be stopped, but an alarm may be issued to notify maintenance personnel to quickly recover the refrigerant again.

[0090] Optionally, the second preset temperature may be 50°C, and the first preset temperature may be 80°C.

[0091] In order to facilitate re-recovery of the refrigerant, in some embodiments of the present application, the controller is further configured as follows:

[0092] After the compressor is controlled to be powered off and shut down and an alarm is issued, the pressure relief valve is closed.

[0093] In this embodiment, the controller detects the operating parameters of the air conditioner according to a preset period. The preset period △T 检 ≤10s. That is, the controller 检 Detect the air conditioner's exhaust temperature, coil temperature, indoor ambient temperature, operating hours, temperature difference between coil temperature and indoor ambient temperature, etc.

[0094] By applying the above technical solution, the air conditioner includes a pressure relief pipe, one end of which is connected to the pipeline between the coarse stop valve and the four-way valve, and the other end is connected to the pipeline between the throttle valve and the fine stop valve. The pressure relief pipe is provided with a pressure relief valve, and the controller is configured as follows: if it is detected that the air conditioner is in cooling mode and the temperature difference between the coil temperature and the indoor ambient temperature is not greater than the preset difference, the operating time after the compressor is started is obtained; if the operating time reaches a first time, the pressure relief valve and the compressor are controlled according to the operating time and the exhaust temperature; wherein the first time is not less than each time within a first time range, and each time within the first time range is greater than zero and not greater than the first preset time, thereby avoiding explosion of the compressor during refrigerant recovery and improving the safety of the air conditioner.

[0095] In order to further explain the technical idea of ​​the present invention, the technical solution of the present invention is now described in combination with specific application scenarios.

[0096] This embodiment provides a control method for an air conditioner, which is applied to the air conditioner as described above, wherein the temperature measured by the exhaust temperature sensor is T 排 , the temperature measured by the inner disk temperature sensor is T 内盘 , the indoor ambient temperature sensor is T 内环 , the refrigerant in this embodiment is Freon.

[0097] When recycling Freon or after installation, due to improper operation, the fine stop valve is opened slightly, and the refrigerant is continuously recycled in the outdoor unit. However, after a long time, the pressure in the compressor continues to increase, and the pressure at the coarse stop valve continues to decrease. Under negative pressure, air can easily enter here, causing the refrigerant, oil, and air in the compressor to mix. Under continuous high pressure, there is a risk of explosion. To prevent this risk, Figure 2 As shown, the following controls are performed during this process:

[0098] Close the fine stop valve in advance or plug the fine stop valve to start refrigerant recovery.

[0099] When the refrigerant is recovered in the outdoor unit, the coil temperature and the indoor ambient temperature tend to be consistent, that is, T 内盘 With T 内环 The values ​​are similar. To prevent the temperature sensor from deviating, △T=T 内环 -T 内盘 When △T≤M, the system is considered to be in the state of recovering Freon, and M can be 0℃ or 1℃; the running time after the compressor is turned on is recorded as T 运行 , T 运行 ≥A, 0<A≤2min, then make the following judgment:

[0100] During this process, the exhaust pressure continues to rise and the exhaust temperature continues to increase. When the compressor runs to T 运行2 , recorded as △T2=T 运行2 -T 运行 , when T 排 ≥N, N≥100℃, and △T2≤B, 0<B≤1min, then open the pressure relief valve. At this time, the throttled refrigerant re-enters the compressor for cooling.

[0101] When the compressor runs to T 运行3 , recorded as △T3=T 运行3 -△T2, when T 排 ≥N, N≥100℃, and △T3≤C, 0<C≤1min, power off and stop, and alarm is displayed on the indoor unit or outdoor control panel; when T排 <N, continue to reduce the compressor frequency to F at a rate of △F (Hz / s) min (0<F min <80Hz), reduce the system pressure rise, at this time, detect T again 排 , X<T 排 <Y, 80℃<Y≤N, 50℃<X<Y, the pressure is still too high in this state, the power is cut off and the machine is shut down, and an alarm is displayed on the indoor unit or outdoor control panel; T 排 ≤X, the pressure risk is considered small and the machine can be kept running without stopping. An alarm will be displayed on the indoor unit or outdoor control panel.

[0102] After the alarm sounds, the maintenance personnel or installers are notified to quickly recycle the Freon; after shutdown, the pressure relief valve returns to the closed state to facilitate the recovery of Freon.

[0103] In this embodiment, the controller performs the following operations according to a preset period △T 检 Detect the operating parameters of the air conditioner, that is, the controller 检 Detection T 排 、T 内盘 、T 内环 、T 运行 , △T, etc., preset period △T 检 ≤10s.

[0104] The present application also provides a control method for an air conditioner, which is applied to the air conditioner as described above. Figure 3 As shown, the method comprises the following steps:

[0105] Step S101, if it is detected that the air conditioner is in cooling mode and the temperature difference between the coil temperature and the indoor ambient temperature is not greater than a preset difference, the running time after the compressor is started is obtained;

[0106] Step S102, if the operating time reaches a first time, controlling the pressure relief valve and the compressor according to the operating time and the exhaust temperature;

[0107] The first duration is not less than each duration within a first duration range, and each duration within the first duration range is greater than zero and not greater than a first preset duration.

[0108] In order to reliably avoid compressor explosion, in some embodiments of the present application, the pressure relief valve and the compressor are controlled according to the operating time and the exhaust temperature, specifically:

[0109] If the operating time reaches a second time and the exhaust temperature is not less than any temperature within the first temperature range, opening the pressure relief valve;

[0110] If the pressure relief valve is in an open state and the operating time reaches a third time and the exhaust temperature is not less than any temperature within the first temperature range, the compressor is powered off and stopped and an alarm is issued;

[0111] Among them, the first difference between the second time length and the first time length is not greater than each time length within the second time length range, each time length within the second time length range is greater than zero and not greater than a second preset time length, the second difference between the third time length and the first difference is not greater than each time length within the second time length range, the second preset time length is less than the first preset time length, and each temperature within the first temperature range is not less than the first preset temperature.

[0112] In order to reliably avoid explosion of the compressor, in some embodiments of the present application, the method further includes:

[0113] If the pressure relief valve is in an open state and the operating time reaches the third time and the exhaust temperature is lower than any temperature in the first temperature range, reducing the operating frequency of the compressor at a preset rate until reaching a preset minimum operating frequency;

[0114] Wherein, the preset minimum operating frequency is greater than zero and less than the first frequency.

[0115] In order to reliably avoid compressor explosion, in some embodiments of the present application, after the operating frequency is reduced to the preset minimum operating frequency, the method further includes:

[0116] If the exhaust temperature is greater than the temperatures within the second temperature range and less than the temperatures within the third temperature range, the compressor is powered off and stopped and an alarm is issued;

[0117] If the exhaust temperature is not greater than any temperature within the second temperature range, an alarm is issued;

[0118] Among them, each temperature in the second temperature range is greater than the second preset temperature and less than each temperature in the third temperature range, each temperature in the third temperature range is greater than the third preset temperature and not greater than each temperature in the first temperature range, the second preset temperature is less than the third preset temperature, and the third preset temperature is less than the first preset temperature.

[0119] In order to facilitate re-recovery of the refrigerant, in some embodiments of the present application, after controlling the compressor to shut down and issue an alarm, the method further includes:

[0120] Close the pressure relief valve.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An air conditioner, comprising: A refrigerant circulation loop, wherein the refrigerant circulates in a loop consisting of a compressor, a condenser, a throttle valve, a fine stop valve, an evaporator, a coarse stop valve and a four-way valve, wherein the fine stop valve is used to control the refrigerant to be transported between an outdoor heat exchanger and an indoor heat exchanger, and the coarse stop valve is used to control the refrigerant to be transported between the indoor heat exchanger and the four-way valve; Characterized in that the air conditioner also includes: A pressure relief pipe, one end of which is connected to the pipeline between the coarse stop valve and the four-way valve, and the other end of which is connected to the pipeline between the throttle valve and the fine stop valve, and a pressure relief valve is provided on the pressure relief pipe; Internal coil temperature sensor, used to detect the coil temperature of the indoor heat exchanger; Indoor ambient temperature sensor, used to detect indoor ambient temperature; Exhaust temperature sensor, used to detect the exhaust temperature of the compressor; The controller is configured as: If it is detected that the air conditioner is in cooling mode and the temperature difference between the coil temperature and the indoor ambient temperature is not greater than a preset difference, obtaining the running time of the compressor after starting; If the operating time reaches a first time, controlling the pressure relief valve and the compressor according to the operating time and the exhaust temperature; Wherein, the first duration is not less than each duration within the first duration range, and each duration within the first duration range is greater than zero and not greater than the first preset duration; The controller is specifically configured as follows: If the operating time reaches a second time and the exhaust temperature is not less than any temperature within the first temperature range, opening the pressure relief valve; If the pressure relief valve is in an open state and the operating time reaches a third time and the exhaust temperature is not less than any temperature within the first temperature range, the compressor is powered off and stopped and an alarm is issued; Among them, the first difference between the second time length and the first time length is not greater than each time length within the second time length range, each time length within the second time length range is greater than zero and not greater than a second preset time length, the second difference between the third time length and the first difference is not greater than each time length within the second time length range, the second preset time length is less than the first preset time length, and each temperature within the first temperature range is not less than the first preset temperature.

2. The air conditioner according to claim 1, characterized in that: The controller is also configured to: If the pressure relief valve is in an open state and the operating time reaches the third time and the exhaust temperature is lower than any temperature in the first temperature range, reducing the operating frequency of the compressor at a preset rate until reaching a preset minimum operating frequency; Wherein, the preset minimum operating frequency is greater than zero and less than the first frequency.

3. The air conditioner according to claim 2, characterized in that: The controller is also configured to: After the operating frequency is reduced to the preset minimum operating frequency, if the exhaust temperature is greater than each temperature in the second temperature range and less than each temperature in the third temperature range, the compressor is controlled to be powered off and stopped and an alarm is issued; After the operating frequency is reduced to the preset minimum operating frequency, if the exhaust temperature is not greater than any temperature within the second temperature range, an alarm is issued; Among them, each temperature in the second temperature range is greater than the second preset temperature and less than each temperature in the third temperature range, each temperature in the third temperature range is greater than the third preset temperature and not greater than each temperature in the first temperature range, the second preset temperature is less than the third preset temperature, and the third preset temperature is less than the first preset temperature.

4. The air conditioner according to claim 1 or 3, characterized in that: The controller is also configured to: After the compressor is controlled to be powered off and shut down and an alarm is issued, the pressure relief valve is closed.

5. A method for controlling an air conditioner, characterized in that: Applied to the air conditioner as claimed in claim 1, the method comprises: If it is detected that the air conditioner is in cooling mode and the temperature difference between the coil temperature and the indoor ambient temperature is not greater than a preset difference, obtaining the running time of the compressor after starting; If the operating time reaches a first time, controlling the pressure relief valve and the compressor according to the operating time and the exhaust temperature; Wherein, the first duration is not less than each duration within the first duration range, and each duration within the first duration range is greater than zero and not greater than the first preset duration; Controlling the pressure relief valve and the compressor according to the operating time and the exhaust temperature is specifically as follows: If the operating time reaches a second time and the exhaust temperature is not less than any temperature within the first temperature range, opening the pressure relief valve; If the pressure relief valve is in an open state and the operating time reaches a third time and the exhaust temperature is not less than any temperature within the first temperature range, the compressor is powered off and stopped and an alarm is issued; Among them, the first difference between the second time length and the first time length is not greater than each time length within the second time length range, each time length within the second time length range is greater than zero and not greater than a second preset time length, the second difference between the third time length and the first difference is not greater than each time length within the second time length range, the second preset time length is less than the first preset time length, and each temperature within the first temperature range is not less than the first preset temperature.

6. The method according to claim 5, characterized in that The method further comprises: If the pressure relief valve is in an open state and the operating time reaches the third time and the exhaust temperature is lower than any temperature in the first temperature range, reducing the operating frequency of the compressor at a preset rate until reaching a preset minimum operating frequency; Wherein, the preset minimum operating frequency is greater than zero and less than the first frequency.

7. The method according to claim 6, characterized in that After the operating frequency is reduced to the preset minimum operating frequency, the method further includes: If the exhaust temperature is greater than the temperatures within the second temperature range and less than the temperatures within the third temperature range, the compressor is powered off and stopped and an alarm is issued; If the exhaust temperature is not greater than any temperature within the second temperature range, an alarm is issued; Among them, each temperature in the second temperature range is greater than the second preset temperature and less than each temperature in the third temperature range, each temperature in the third temperature range is greater than the third preset temperature and not greater than each temperature in the first temperature range, the second preset temperature is less than the third preset temperature, and the third preset temperature is less than the first preset temperature.

8. The method according to claim 5 or 7, characterized in that After controlling the compressor to shut down and issue an alarm, the method further includes: Close the pressure relief valve.

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