Machine room air conditioner control method and device, storage medium and electrical appliance

Abstract

Embodiments of the application disclose a machine room air conditioner control method and device, a storage medium and an electrical appliance, which are applied to a machine room air conditioner. An electric tee valve is arranged on an exhaust side of a compressor. The electric tee valve comprises a first port, a second port and a third port. The first port is connected with an outlet of an oil separator. The second port is connected with a return air pipe of the compressor. The third port is connected with an inlet of a condenser. The method comprises the following steps: when it is detected that the compressor is in a shutdown state, an oil sump temperature of the compressor is acquired, and a reference temperature is acquired; when a difference between the oil sump temperature and the reference temperature is less than or equal to a temperature threshold, the first port of the electric tee valve is controlled to be conductive with the second port of the electric tee valve; and the compressor is controlled to preheat at a first preset rotating speed based on a conductive state of the first port and the second port. The embodiments of the application can effectively prevent refrigerant from migrating to the compressor, and avoid various compressor problems caused by the refrigerant in the compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to a computer room air conditioner control method and device, a storage medium, and an electrical appliance. BACKGROUND

[0002] A computer room air conditioner is a special air conditioner designed for modern electronic equipment rooms. The computer room air conditioner can not only control the temperature of the computer room, but also control the humidity of the computer room. The computer room air conditioner is an important device in the computer room.

[0003] The computer room air conditioner is designed to accurately control the temperature and humidity, and therefore has high reliability, can ensure continuous operation throughout the year, and has maintainability, assembly flexibility, and redundancy. The computer room precision air conditioner is widely used in computer rooms, program-controlled switch machine rooms, satellite mobile communication stations, large medical equipment rooms, laboratories, test rooms, and precision electronic instrument production workshops, and the like. In these precision environments, the temperature standards required by each computer room are different due to the different equipment in the computer room. For example, the room temperature of some computer rooms needs to be controlled at about 22 degrees Celsius in summer and about 20 degrees Celsius in winter; the room temperature of some computer rooms needs to be controlled at 15-30 degrees Celsius throughout the year; and the room temperature of some computer rooms needs to be controlled at 10-35 degrees Celsius. SUMMARY

[0004] The embodiments of the present application provide a computer room air conditioner control method and device, a computer storage medium, and an electrical appliance. In a state where a compressor is stopped, when a difference between an oil tank temperature of the compressor and an ambient temperature is small, an electric three-way valve arranged at an exhaust side of the compressor is controlled to be in a conduction state, so that the compressor can operate at a preset rotating speed in a local loop to achieve a preheating effect, that is, a cavity and an oil tank of the compressor are always controlled in a certain temperature range, which can effectively prevent refrigerant leaked from an electronic expansion valve to a evaporator from migrating to the compressor, and avoid various compressor problems caused by the refrigerant in the compressor. The technical solution is as follows:

[0005] In a first aspect, the embodiments of the present application provide a computer room air conditioner control method applied to a computer room air conditioner. The computer room air conditioner includes a compressor, an oil separator, a condenser, an electronic expansion valve, and an evaporator. An exhaust side of the compressor is arranged with an electric three-way valve. An exhaust pipe of the compressor is connected with an inlet of the oil separator. A first port of the electric three-way valve is connected with an outlet of the oil separator. A second port of the electric three-way valve is connected with a return air pipe of the compressor. A third port of the electric three-way valve is connected with an inlet of the condenser. The condenser is connected with the evaporator through the electronic expansion valve. An outlet of the evaporator is connected with the return air pipe of the compressor. The method includes the following steps.

[0006] acquire a sump temperature of the compressor, and acquire a reference temperature when it is detected that the compressor is in a shutdown state;

[0007] control the second port of the electric three-way valve and the third port of the electric three-way valve to be conductive when a difference between the sump temperature and the reference temperature is less than or equal to a temperature threshold;

[0008] control the compressor to preheat at a first preset rotating speed based on a conductive state of the second port and the third port.

[0009] In a second aspect, an embodiment of the present application provides a control method of a computer room air conditioner, applied to a computer room air conditioner, the computer room air conditioner comprising a compressor, an oil separator, an exhaust one-way valve, a condenser, an electronic expansion valve and an evaporator, a return air side of the compressor being configured with an electric three-way valve, an exhaust pipe of the compressor being connected with an inlet of the oil separator, the oil separator being connected with the condenser through the exhaust one-way valve, the condenser being connected with the evaporator through the electronic expansion valve, an outlet of the evaporator being connected with a first port of the electric three-way valve, a second port of the electric three-way valve being connected with an outlet of the exhaust one-way valve, and a third port of the electric three-way valve being connected with the return air pipe of the compressor, the method comprising:

[0010] acquire a sump temperature of the compressor, and acquire a reference temperature when it is detected that the compressor is in a shutdown state;

[0011] control the second port of the electric three-way valve and the third port of the electric three-way valve to be conductive when a difference between the sump temperature and the reference temperature is less than or equal to a temperature threshold;

[0012] control the compressor to preheat at a first preset rotating speed based on a conductive state of the second port and the third port.

[0013] In a third aspect, an embodiment of the present application provides a control device of a computer room air conditioner, applied to a computer room air conditioner, the computer room air conditioner comprising a compressor, an oil separator, a condenser, an electronic expansion valve and an evaporator, an exhaust side of the compressor being configured with an electric three-way valve, an exhaust pipe of the compressor being connected with an inlet of the oil separator, a first port of the electric three-way valve being connected with an outlet of the oil separator, a second port of the electric three-way valve being connected with the return air pipe of the compressor, and a third port of the electric three-way valve being connected with an inlet of the condenser, the condenser being connected with the evaporator through the electronic expansion valve, and an outlet of the evaporator being connected with the return air pipe of the compressor, the device comprising:

[0014] a temperature acquisition module, configured to acquire a sump temperature of the compressor and acquire a reference temperature when it is detected that the compressor is in a shutdown state;

[0015] a first control module, configured to control the first port of the electric three-way valve and the second port of the electric three-way valve to be conductive when a difference between the sump temperature and the reference temperature is less than or equal to a temperature threshold value;

[0016] a second control module, configured to control the compressor to preheat at a first preset rotating speed based on a conductive state of the first port and the second port.

[0017] In a fourth aspect, an embodiment of the present application provides a machine room air conditioner control device, applied to a machine room air conditioner, and characterized in that the machine room air conditioner comprises a compressor, an oil separator, a condenser, an electronic expansion valve, an evaporator and a controller, an electric three-way valve is arranged on an exhaust side of the compressor, an exhaust pipe of the compressor is connected with an inlet of the oil separator, a first port of the electric three-way valve is connected with an outlet of the oil separator, a second port of the electric three-way valve is connected with a gas return pipe of the compressor, a third port of the electric three-way valve is connected with an inlet of the condenser, the condenser is connected with the evaporator through the electronic expansion valve, an outlet of the evaporator is connected with the gas return pipe of the compressor, and the controller is connected with the compressor, the oil separator, the condenser, the electronic expansion valve and the evaporator respectively, and the controller is configured to:

[0018] acquire a sump temperature of the compressor and acquire a reference temperature when it is detected that the compressor is in a shutdown state;

[0019] control the first port of the electric three-way valve and the second port of the electric three-way valve to be conductive when a difference between the sump temperature and the reference temperature is less than or equal to a temperature threshold value;

[0020] control the compressor to preheat at a first preset rotating speed based on a conductive state of the first port and the second port.

[0021] In a fifth aspect, the embodiments of the present application provide a machine room air conditioner control device, which is applied to a machine room air conditioner. The machine room air conditioner comprises a compressor, an oil separator, an exhaust one-way valve, a condenser, an electronic expansion valve and an evaporator. The compressor is provided with an electric three-way valve at a return air side. An exhaust pipe of the compressor is connected with an inlet of the oil separator. The oil separator is connected with the condenser through the exhaust one-way valve. The condenser is connected with the evaporator through the electronic expansion valve. An outlet of the evaporator is connected with a first port of the electric three-way valve. A second port of the electric three-way valve is connected with an outlet of the exhaust one-way valve. A third port of the electric three-way valve is connected with a return air pipe of the compressor. The device comprises:

[0022] a temperature acquisition module, configured to acquire an oil tank temperature of the compressor and acquire a reference temperature when it is detected that the compressor is in a shutdown state;

[0023] a first control module, configured to control the second port of the electric three-way valve and the third port of the electric three-way valve to be conductive when a difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold value.

[0024] The first control module is configured to control the compressor to preheat at a first preset rotating speed based on a conductive state of the second port and the third port.

[0025] In a sixth aspect, the embodiments of the present application provide a machine room air conditioner control device, which is applied to a machine room air conditioner. The machine room air conditioner comprises a compressor, an oil separator, an exhaust one-way valve, a condenser, an electronic expansion valve, an evaporator and a controller. The compressor is provided with an electric three-way valve at a return air side. An exhaust pipe of the compressor is connected with an inlet of the oil separator. The oil separator is connected with the condenser through the exhaust one-way valve. The condenser is connected with the evaporator through the electronic expansion valve. An outlet of the evaporator is connected with a first port of the electric three-way valve. A second port of the electric three-way valve is connected with an outlet of the exhaust one-way valve. A third port of the electric three-way valve is connected with a return air pipe of the compressor. The controller is connected with the compressor, the oil separator, the condenser, the electronic expansion valve and the evaporator respectively. The controller is configured to:

[0026] acquire an oil tank temperature of the compressor and acquire a reference temperature when it is detected that the compressor is in a shutdown state;

[0027] control the second port of the electric three-way valve and the third port of the electric three-way valve to be conductive when a difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold value.

[0028] control the compressor to preheat according to a first preset rotating speed based on the conduction state of the first port and the second port.

[0029] In a seventh aspect, an embodiment of the present application provides a computer storage medium, which has a plurality of instructions, and the instructions are suitable for being loaded by a processor and performing the method steps described above.

[0030] In an eighth aspect, an embodiment of the present application provides an electrical appliance, which can include a memory and a processor; wherein the memory stores a computer program, and the computer program is suitable for being loaded by the memory and performing the method steps described above.

[0031] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects:

[0032] In the embodiment of the present application, the exhaust side of the compressor of the computer room air conditioner is configured with an electric tee valve, the first port of the electric tee valve is connected with the outlet of the oil separator, the second port of the electric tee valve is connected with the return pipe of the compressor, and the third port of the electric tee valve is connected with the inlet of the condenser. When it is detected that the compressor is in a shutdown state, the oil sump temperature of the compressor is acquired, and a reference temperature is acquired. Then, when the difference between the oil sump temperature and the reference temperature is less than or equal to a temperature threshold, the first port of the electric tee valve is controlled to be in conduction with the second port of the electric tee valve. Then, the compressor is controlled to preheat according to a first preset rotating speed based on the conduction state of the first port and the second port. In the embodiment of the present application, when the difference between the oil sump temperature of the compressor and the ambient temperature is small, the electric tee valve configured at the exhaust side of the compressor is controlled to be in a conduction state, so that the compressor can run at a preset rotating speed in a local loop to achieve the preheating effect. That is, the cavity and the oil sump of the compressor are always controlled within a certain temperature range, which can effectively prevent the refrigerant leaked from the electronic expansion valve to the evaporator from migrating to the compressor, and avoid various compressor problems caused by the refrigerant in the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0034] Figure 1 is a flow diagram of a computer room air conditioner control method provided by an embodiment of the present application;

[0035] Figure 2 is a structural diagram of a computer room air conditioner provided by an embodiment of the present application;

[0036] Figure 3 is a flowchart of another machine room air conditioner control method provided by an embodiment of the present application;

[0037] Figure 4 is a flowchart of another machine room air conditioner control method provided by an embodiment of the present application;

[0038] Figure 5 is a structural diagram of a machine room air conditioner provided by an embodiment of the present application;

[0039] Figure 6 is a flowchart of another machine room air conditioner control method provided by an embodiment of the present application;

[0040] Figure 7 is a structural diagram of a machine room air conditioner provided by an embodiment of the present application;

[0041] Figure 8 is a structural diagram of a machine room air conditioner control device provided by an embodiment of the present application;

[0042] Figure 9 is a structural diagram of a machine room air conditioner control device provided by an embodiment of the present application;

[0043] Figure 10 is a structural diagram of a machine room air conditioner control device provided by an embodiment of the present application;

[0044] Figure 11 is a structural diagram of a machine room air conditioner control device provided by an embodiment of the present application;

[0045] Figure 12 is a structural diagram of an electrical appliance provided by an embodiment of the present application;

[0046] Figure 13 is a structural diagram of an electrical appliance provided by an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the purpose, characteristics, advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0048] In the description of the present application, it should be understood that the terms "first", "second" and the like are used only for descriptive purposes, and are not intended to indicate or imply relative importance. In the description of the present application, it should be noted that, unless otherwise specified and limited, "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units not listed, or optionally includes other steps or units inherent to the process, method, product or device. The specific meaning of the above terms in the present application can be understood by the person skilled in the art. In addition, in the description of the present application, "a plurality of" means two or more, unless otherwise specified. The association relationship of the associated objects is described, which means that there can be three relationships, for example, A and / or B can represent three cases: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0049] In the related art, computer room air conditioners are widely used in high-precision environments, and in such environments, computer room air conditioners operate all day long. In the actual use of computer room air conditioners, a main air conditioner and a backup air conditioner are usually designed, and the main air conditioner and the backup air conditioner are used in rotation. Therefore, the air conditioner is in a long-term shutdown state.

[0050] In the case of long-term shutdown of the air conditioner, and due to the temperature difference between indoor and outdoor, the refrigerant will migrate to the low-temperature side. Since the compressor of the computer room air conditioner is located indoors, the computer room air conditioner is cooled all year round, and the refrigerant will migrate to the compressor. At this time, the refrigerant will migrate to the compressor cavity and mix with the refrigeration oil, which will not only cause the problem of liquid start-up of the compressor and damage to the compressor, but also cause the problem of lack of oil wear of the compressor due to the discharge of a large amount of refrigeration oil. Therefore, in the above case, the migration of the refrigerant to the compressor will cause multiple compressor problems. Therefore, how to avoid the migration of the refrigerant to the compressor to cause multiple compressor problems is a technical problem that needs to be solved.

[0051] The present application will be described in detail below with reference to specific embodiments.

[0052] In the following method embodiments, in order to facilitate description, only the execution subject of each step is introduced as an electrical appliance.

[0053] Please refer to Figure 1 A flowchart of a computer room air conditioner control method provided by an embodiment of the present application.

[0054] Before describing the method embodiments shown in Figure 1 Please refer toFigure 2 A structural schematic diagram of a computer room air conditioner is shown. Figure 1 The computer room air conditioner control method shown can be based on Figure 2 The computer room air conditioner structural diagram shown can be implemented.

[0055] As shown in Figure 2 The condenser 240, electronic expansion valve 250, evaporator 260, compressor 210, oil separator 220, electric three-way valve 230, and temperature sensor 241 in the condenser 240, condensing pressure detection device 242 around the condenser 240, temperature sensor 261 in the evaporator 260, and temperature sensor 211 in the compressor 210 are shown. The outlet of the condenser is connected to the inlet of the evaporator through the electronic expansion valve. The outlet of the evaporator is connected to the return pipe of the compressor. The exhaust pipe of the compressor is connected to the first port of the electric three-way valve through the oil separator, and the return pipe of the compressor is connected to the second port of the electric three-way valve. The third port of the electric three-way valve is connected to the inlet of the condenser.

[0056] In the embodiments of the present application, the computer room air conditioner can be used for refrigeration. The compressor is used to convert electrical energy into mechanical energy to compress the refrigerant. The compressor converts the low-temperature and low-pressure gaseous refrigerant flowing out of the evaporator into high-temperature and high-pressure gaseous refrigerant while ensuring the flow of the refrigerant. The high-temperature and high-pressure gaseous refrigerant can first flow to the oil separator through the exhaust pipe of the compressor. The oil separator can separate the mixed lubricating oil in the high-temperature and high-pressure gaseous refrigerant, and the separated lubricating oil can return to the bottom oil tank of the compressor. The gaseous refrigerant separated by the oil separator can enter the condenser from the exhaust pipe of the compressor. The condenser can condense the high-temperature and high-pressure gaseous refrigerant into supercooled medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant can enter the electronic expansion valve, which can control the flow of the refrigerant by controlling the size of the opening. The electronic expansion valve can expand the medium-temperature and high-pressure liquid refrigerant into low-temperature and low-pressure liquid refrigerant, so that its saturation temperature is lower than the temperature of the refrigeration space. The low-temperature and low-pressure liquid refrigerant can enter the evaporator, which can use the low-temperature and low-pressure liquid refrigerant to absorb the heat in the room, evaporate the low-temperature and low-pressure liquid refrigerant into superheated low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant can flow back to the compressor, thus forming a refrigeration cycle.

[0057] As shown in Figure 1 The method of the embodiments of the present application can include the following steps:

[0058] S101, when it is detected that the compressor is in a shutdown state, the oil tank temperature of the compressor is obtained, and a reference temperature is obtained.

[0059] It is easy to understand that the compressor in the shutdown state refers to the state that the compressor is also shut down when the machine room air conditioner is in the standby state. The machine room air conditioner in the standby state refers to the state that the air conditioner is not working, but the machine is kept in normal operation so that it can be started immediately when needed.

[0060] The oil groove temperature refers to the temperature of the lubricating oil in the oil groove in the compressor cavity.

[0061] The reference temperature can refer to the outdoor ambient temperature, which can be obtained by the temperature sensor in the outdoor unit. The reference temperature can also refer to the middle temperature of the indoor evaporator.

[0062] In some embodiments, a temperature sensor for measuring oil temperature can be installed inside the compressor body. When it is detected that the compressor is in the shutdown state, the oil groove temperature can be obtained by the temperature sensor for measuring oil temperature. The ambient temperature measured by the temperature sensor in the outdoor unit can be used as the reference temperature. The outdoor unit can refer to the condenser installed outdoors, so the ambient temperature measured by the temperature sensor installed in the condenser can be used as the reference temperature. Alternatively, the middle temperature of the indoor evaporator can be used as the reference temperature.

[0063] S102, when the difference between the oil groove temperature and the reference temperature is less than or equal to the temperature threshold, the first port of the electric three-way valve is controlled to be conductive with the second port of the electric three-way valve.

[0064] In some embodiments, the difference between the oil groove temperature and the reference temperature can be calculated after the oil groove temperature and the reference temperature are obtained. The difference can be compared with the temperature threshold. When the difference is less than or equal to the temperature threshold, the first port of the electric three-way valve can be controlled to be conductive with the second port of the electric three-way valve, that is, the third port of the electric three-way valve is broken.

[0065] For example, the temperature threshold can be set to 10 degrees Celsius.

[0066] S103, control the compressor to preheat at a first preset rotating speed based on the conductive state of the first port and the second port.

[0067] It is easy to understand that the first preset rotating speed can refer to the number of revolutions per unit time that the compressor rotates in advance.

[0068] In some embodiments, when the first port and the second port of the electric three-way valve are in a conductive state, the compressor can be locally operated, and thus the compressor can be controlled to operate at a first preset rotating speed to preheat the cavity of the compressor. That is, the compressor operates at the first preset rotating speed, which can increase the temperature in the cavity of the compressor, so that the oil groove of the compressor can be controlled within a certain temperature range, so that the refrigerant dissolved in the refrigeration oil can be separated out, and thus the refrigerant in the compressor can be prevented from migrating to the compressor.

[0069] In the embodiments of the present application, the electric three-way valve is arranged on the exhaust side of the compressor of the machine room air conditioner, the first port of the electric three-way valve is connected with the outlet of the oil separator, the second port of the electric three-way valve is connected with the return pipe of the compressor, and the third port of the electric three-way valve is connected with the inlet of the condenser. When it is detected that the compressor is in a shutdown state, the oil groove temperature of the compressor is obtained, and a reference temperature is obtained. Then, when the difference between the oil groove temperature and the reference temperature is less than or equal to a temperature threshold, the first port of the electric three-way valve is controlled to be conductive with the second port of the electric three-way valve. Then, the compressor is controlled to preheat at a first preset rotating speed based on the conductive state of the first port and the second port. In the embodiments of the present application, when the difference between the oil groove temperature of the compressor and the ambient temperature is small, the electric three-way valve arranged on the exhaust side of the compressor is controlled to be in a conductive state, so that the compressor can operate at a preset rotating speed in a local loop to achieve preheating. That is, the cavity and the oil groove of the compressor are always controlled within a certain temperature range, which can effectively prevent the refrigerant leaked from the electronic expansion valve to the evaporator from migrating to the compressor, and avoid various problems caused by the refrigerant in the compressor.

[0070] Please refer to Figure 3 , a flowchart of a machine room air conditioner control method provided in the embodiments of the present application. Figure 3 The machine room air conditioner control method shown can be implemented based on Figure 2 The machine room air conditioner shown in the structural diagram, specifically, Figure 2 The functions of the devices included in the embodiments of the present application can be referred to the above description, which will not be repeated here.

[0071] As Figure 3 shown, the method of the embodiments of the present application can include the following steps:

[0072] S301, when sending a shutdown instruction to the compressor, controlling the electronic expansion valve to be in a closed state, and controlling the compressor to operate at a second preset rotating speed.

[0073] It is easy to understand that the shutdown instruction refers to an instruction for controlling the compressor to pause operation.

[0074] The second preset rotating speed can be a preset number of rotations of the compressor per unit time. The second preset rotating speed is a low rotating speed.

[0075] During the refrigeration process, the compressor can be in a high-speed rotating process, a low-speed rotating process, and a pause rotating process. For example, when the indoor actual temperature is far from the set temperature during the refrigeration stage, the compressor can be in a high-speed rotating process to speed up the refrigeration; when the machine room air conditioner is in a preheating state, the compressor can be in a low-speed rotating process, so that the subsequent refrigeration demand can be met more quickly and effectively; when the indoor actual temperature is equal to the set temperature during the refrigeration stage, the compressor can be in a pause rotating process.

[0076] Specifically, when the controller of the machine room air conditioner detects that the compressor can be stopped, a stop command can be sent to the compressor to facilitate the compressor to perform corresponding operations according to the stop command. When the stop command is sent to the compressor, the electronic expansion valve can be controlled to be in a closed state, and the compressor can be controlled to operate at a second preset rotating speed. After receiving the stop command, the compressor can operate at the second preset rotating speed. Since the electronic expansion valve has been closed at this time, the refrigerant in the outdoor unit and the pipeline has been cut off and cannot directly return to the evaporator, and cannot return to the exhaust pipe of the compressor, so that the compressor operates at the second preset rotating speed, which can reduce or even empty the refrigerant migrated from the evaporator to the compressor, thereby realizing the function of emptying the refrigerant in the evaporator. Therefore, there is no refrigerant migration to the compressor in the subsequent process.

[0077] S302, when the evaporating pressure of the evaporator is in a preset pressure range, the compressor is controlled to be in a stopped state, and the first port of the electric three-way valve is controlled to be in conduction with the second port of the electric three-way valve.

[0078] In some embodiments, during the process in which the compressor operates at the second preset rotating speed, the second preset rotating speed is a low rotating speed, which can gradually reduce the refrigerant migrated from the evaporator to the compressor, until the evaporating pressure of the evaporator is in a preset pressure range, the compressor is controlled to be in a stopped state, that is, the compressor is stopped, and the first port of the electric three-way valve is controlled to be in conduction with the second port of the electric three-way valve. In this way, when the first port of the electric three-way valve is in conduction with the second port of the electric three-way valve, the compressor can be controlled to operate locally in the subsequent process if necessary.

[0079] S303, when it is detected that the compressor is in a stopped state, the oil sump temperature of the compressor is obtained.

[0080] In some embodiments, the temperature of the lubricating oil in the bottom oil sump of the compressor can be obtained by a temperature sensor installed on the compressor when the compressor is in a stopped state.

[0081] S304, acquiring an outdoor environment temperature, and determining the outdoor environment temperature as the reference temperature.

[0082] In some embodiments, in the case of acquiring the oil sump temperature of the compressor, the outdoor environment temperature can be monitored by a temperature sensor installed on the condenser, and then the outdoor environment temperature can be determined as the reference temperature.

[0083] S305, acquiring a middle temperature of the evaporator, and determining the middle temperature as the reference temperature.

[0084] In some embodiments, in the case of acquiring the oil sump temperature of the compressor, the middle temperature of the evaporator can be monitored by a temperature sensor installed on the evaporator, and then the middle temperature can be determined as the reference temperature.

[0085] S306, when the difference between the oil sump temperature and the reference temperature is less than or equal to a temperature threshold, controlling the first port of the electric three-way valve to be conductive with the second port of the electric three-way valve.

[0086] In some embodiments, after acquiring the oil sump temperature and the reference temperature, the difference between the oil sump temperature and the reference temperature can be calculated. When the difference between the oil sump temperature and the reference temperature is less than or equal to a temperature threshold, the first port of the electric three-way valve can be controlled to be conductive with the second port of the electric three-way valve.

[0087] S307, controlling the compressor to operate at a first preset speed for preheating based on the conductive state of the first port and the second port.

[0088] In some embodiments, in the case that the first port and the second port of the electric three-way valve are in a conductive state, the compressor can be locally operated, and therefore the compressor can be controlled to operate at a first preset speed to preheat the cavity of the compressor. That is, the compressor operates at a first preset speed, which can raise the temperature in the cavity of the compressor, so that the oil sump temperature of the compressor can be controlled within a certain temperature range, so that the refrigerant dissolved in the refrigeration oil can be separated out, and then there will be no refrigerant in the compressor, achieving the effect of effectively preventing the refrigerant from migrating to the compressor.

[0089] S308, when it is detected that the compressor is in an operating state, controlling the first port of the electric three-way valve to be conductive with the third port of the electric three-way valve.

[0090] It is easy to understand that the operating state of the compressor can refer to the state in which the compressor operates at a high speed to achieve refrigeration.

[0091] In some embodiments, when it is detected that the compressor is in the running state, the first port of the electric three-way valve can be controlled to be in conduction with the third port of the electric three-way valve, so that the refrigerant compressed by the compressor enters the condenser for cooling, and then passes through the expansion valve to reduce the pressure, and the refrigerant after the pressure reduction enters the evaporator, the evaporator uses the refrigerant to absorb the heat in the room to achieve the effect of refrigeration, and finally the refrigerant processed by the evaporator enters the compressor again, and the above processing process is repeated to achieve the effect of continuous refrigeration.

[0092] S309, obtaining a condensing pressure of the condenser.

[0093] S310, when the condensing pressure is less than or equal to the pressure threshold, controlling the compressor to run at a third preset speed.

[0094] S311, when the condensing pressure is greater than the pressure threshold, controlling the compressor to be in a shutdown state.

[0095] The S309-S311 will be explained below.

[0096] In some embodiments, in the scene of low outdoor temperature, the condensing pressure of the condenser can be detected in real time, and the size of the condensing pressure and the pressure threshold can be monitored in real time. When it is monitored that the condensing pressure is less than or equal to the pressure threshold, the compressor can be controlled to run at a third preset speed so that the condensing pressure reaches the pressure threshold. At this time, the machine room air conditioner enters a preheating mode, the outdoor fan remains closed, and the state of the electric three-way valve can be that the first port is in conduction with the second port. In this state, when it is monitored that the condensing pressure is greater than the pressure threshold, the machine room air conditioner can exit the preheating mode. At this time, the compressor can be controlled to be in a shutdown state, that is, the compressor is no longer controlled to run at the third preset speed, and the compressor is no longer controlled to rotate and run. In this way, it can be ensured that the condensing pressure is greater than the pressure threshold, so that when the machine room air conditioner needs to run for refrigeration, the compressor can quickly establish a high-low pressure difference for normal start, and the effect of quickly starting for refrigeration is achieved.

[0097] In some embodiments, in the scene of low outdoor temperature, when it is monitored that the condensing pressure is greater than the pressure threshold, the compressor can be controlled to be in a shutdown state. At this time, the machine room air conditioner does not need to enter the preheating mode. In this case, the condensing pressure is greater than the pressure threshold, and the compressor can quickly establish a high-low pressure difference for normal start, which does not affect the quick start of the compressor to achieve refrigeration.

[0098] In the embodiment of the present application, the electric three-way valve is arranged on the exhaust side of the compressor to flexibly control the electric three-way valve to be in different conducting states when it is monitored that the compressor is in a shutdown state or a running state. On the one hand, when the difference between the oil tank temperature and the reference temperature is small, the first port and the second port of the electric three-way valve are controlled to be in conduction, the compressor can be controlled to preheat at a first preset rotating speed, so that the compressor can run in a local loop, so that the compressor oil tank temperature can be controlled within a certain temperature range, so that the refrigerant dissolved in the refrigeration oil can be separated out, and then there is no refrigerant in the compressor, thereby effectively preventing the refrigerant from migrating to the compressor, and avoiding various compressor problems caused by the refrigerant in the compressor. On the other hand, when the first port and the third port of the electric three-way valve are in conduction, the compressor can be controlled to run at a high speed to achieve a refrigeration effect. In addition, when it is monitored that the condensing pressure of the outdoor unit is too low, the machine room air conditioner enters a preheating mode, the compressor is controlled to run at a certain rotating speed so that the condensing pressure reaches a pressure threshold, so that the compressor can quickly establish a high-low pressure difference for normal start when there is a refrigeration demand, thereby achieving the effect of quickly starting to refrigerate.

[0099] Please refer to Figure 4 , a flowchart of a machine room air conditioner control method provided in the embodiment of the present application.

[0100] Before describing Figure 4 the method embodiment shown in the figure, please refer to Figure 5 , a structural diagram of a machine room air conditioner. Figure 4 The machine room air conditioner control method shown in the figure can be implemented based on Figure 5 the structural diagram of the machine room air conditioner.

[0101] As shown in Figure 5 , it includes a condenser 540, an electronic expansion valve 550, an evaporator 560, an electric three-way valve 570, a compressor 510, an oil separator 520, an exhaust one-way valve 530, a temperature sensor 541 in the condenser 540, a condensing pressure detection device 542 around the condenser 540, a temperature sensor 561 in the evaporator 560, and a temperature sensor 511 in the compressor 510. The outlet of the condenser is connected to the inlet of the evaporator through the electronic expansion valve. The electric three-way valve is arranged between the evaporator and the return air side of the compressor, specifically, the outlet of the evaporator is connected to the first port of the electric three-way valve, the return air pipe of the compressor is connected to the third port of the electric three-way valve, and the second port of the electric three-way valve is connected to the inlet of the condenser. The exhaust pipe of the compressor is connected to the inlet of the condenser in sequence through the oil separator and the exhaust one-way valve.

[0102] In the embodiment of the present application, the machine room air conditioner can be used for refrigeration. Among them, the compressor is used to convert electrical energy into mechanical energy and compress the refrigerant. The compressor converts the low-temperature and low-pressure gaseous refrigerant flowing out of the evaporator into high-temperature and high-pressure gaseous refrigerant while ensuring the flow of the refrigerant. The high-temperature and high-pressure gaseous refrigerant can first flow to the oil separator through the exhaust pipe of the compressor. The oil separator can separate the mixed lubricating oil in the high-temperature and high-pressure gaseous refrigerant, and the separated lubricating oil can return to the bottom oil tank of the compressor. The gaseous refrigerant separated by the oil separator can enter the condenser through the exhaust one-way valve. The condenser can condense the high-temperature and high-pressure gaseous refrigerant into supercooled medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant can enter the electronic expansion valve. The electronic expansion valve can control the flow of the refrigerant by controlling the size of the opening. The electronic expansion valve can expand the medium-temperature and high-pressure liquid refrigerant into low-temperature and low-pressure liquid refrigerant, so that its saturation temperature is lower than the temperature of the refrigeration space. The low-temperature and low-pressure liquid refrigerant can enter the evaporator. The evaporator can use the low-temperature and low-pressure liquid refrigerant to absorb the heat in the room, and evaporate the low-temperature and low-pressure liquid refrigerant into superheated low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant can flow back to the compressor, so as to form a refrigeration cycle.

[0103] As shown in Figure 4 The method of the embodiment of the present application can include the following steps:

[0104] S401, when it is detected that the compressor is in a shutdown state, the oil tank temperature of the compressor is obtained, and a reference temperature is obtained.

[0105] It is easy to understand that the compressor is in a shutdown state, which means that the machine room air conditioner is in a standby state, and the compressor is also in a shutdown state. The machine room air conditioner in standby state means that the air conditioner is not working, but the machine is running normally, so that it can start immediately when needed.

[0106] The oil tank temperature refers to the temperature of the lubricating oil in the oil tank in the compressor cavity.

[0107] The reference temperature can refer to the outdoor ambient temperature, which can be obtained by the temperature sensor in the outdoor unit. The reference temperature can also refer to the middle temperature of the indoor evaporator.

[0108] In some embodiments, a temperature sensor for measuring oil temperature can be installed inside the compressor body. When it is detected that the compressor is in a shutdown state, the oil sump temperature can be obtained by the temperature sensor for measuring oil temperature. The ambient temperature measured by the temperature sensor in the outdoor unit can be used as a reference temperature. The outdoor unit can refer to the condenser installed outdoors, and thus the ambient temperature measured by the temperature sensor installed in the condenser can be used as the reference temperature. Alternatively, the middle temperature of the evaporator in the indoor unit can be used as the reference temperature.

[0109] S402, when the difference between the oil sump temperature and the reference temperature is less than or equal to the temperature threshold, the second port of the electric three-way valve is controlled to be conductive with the third port of the electric three-way valve.

[0110] In some embodiments, the difference between the oil sump temperature and the reference temperature can be calculated after the oil sump temperature and the reference temperature are obtained. The difference can be compared with the temperature threshold, and when the difference is less than or equal to the temperature threshold, the second port of the electric three-way valve can be controlled to be conductive with the third port of the electric three-way valve, that is, the first port of the electric three-way valve is broken.

[0111] For example, the temperature threshold can be set to 10 degrees Celsius.

[0112] S403, based on the conductive state of the second port and the third port, the compressor is controlled to operate at a first preset speed for preheating.

[0113] It is easy to understand that the first preset speed can refer to the number of revolutions of the compressor per unit time that is set in advance.

[0114] In some embodiments, when the second port and the third port of the electric three-way valve are in a conductive state, the compressor can be operated in a local mode, and thus the compressor can be controlled to operate at a first preset speed for preheating the cavity of the compressor. That is, the compressor operates at a first preset speed, which can increase the temperature in the cavity of the compressor, so that the oil sump of the compressor can be controlled within a certain temperature range, so that the refrigerant dissolved in the refrigeration oil can be separated out, and thus there is no refrigerant in the compressor, which can effectively prevent the refrigerant from migrating to the compressor.

[0115] In the embodiment of the present application, the compressor of the machine room air conditioner is provided with an electric three-way valve on the gas return side, the first port of the electric three-way valve is connected with the outlet of the evaporator, the second port of the electric three-way valve is connected with the inlet of the condenser, and the third port of the electric three-way valve is connected with the gas return pipe of the compressor. When it is detected that the compressor is in a shutdown state, the oil sump temperature of the compressor is obtained, and the reference temperature is obtained. Then, when the difference between the oil sump temperature and the reference temperature is less than or equal to the temperature threshold, the second port of the electric three-way valve is controlled to be conductive with the third port of the electric three-way valve. Then, the compressor is controlled to preheat at the first preset rotating speed based on the conductive state of the second port and the third port. In the present application, when the difference between the oil sump temperature of the compressor and the ambient temperature is small, the electric three-way valve arranged on the gas return side of the compressor is controlled to be in a conductive state, so that the compressor can operate at a preset rotating speed in a local loop to achieve the preheating effect. The cavity and the oil sump of the compressor are always controlled within a certain temperature range, which can effectively prevent the refrigerant leaked from the electronic expansion valve to the evaporator from migrating to the compressor, and avoid various compressor problems caused by the refrigerant in the compressor.

[0116] Referring to Figure 6 , a flowchart of a machine room air conditioner control method is provided in the embodiment of the present application.

[0117] Before describing Figure 6 the method embodiment shown in the figure, referring to Figure 7 , a structural diagram of a machine room air conditioner is shown. Figure 6 The machine room air conditioner control method shown in the figure can be implemented based on Figure 7 the structural diagram of the machine room air conditioner.

[0118] As shown in Figure 7 , the machine room air conditioner includes a condenser 740, a liquid accumulator 750, a fluorine pump 760, a bypass one-way valve 761 connected in parallel with the fluorine pump, an electronic expansion valve 770, an evaporator 780, an electric three-way valve 790, a compressor 710, an oil separator 720, an exhaust one-way valve 730, a temperature sensor 741 in the condenser 740, a condensing pressure detection device 742 around the condenser 740, a temperature sensor 761 in the evaporator 760, and a temperature sensor 711 in the compressor 710. The outlet of the condenser is connected with the inlet of the evaporator in sequence through the liquid accumulator, the fluorine pump and the electronic expansion valve. The electric three-way valve is arranged between the evaporator and the gas return side of the compressor. Specifically, the outlet of the evaporator is connected with the first port of the electric three-way valve, the gas return pipe of the compressor is connected with the third port of the electric three-way valve, and the second port of the electric three-way valve is connected with the inlet of the condenser. The exhaust pipe of the compressor is connected with the inlet of the condenser in sequence through the oil separator and the exhaust one-way valve.

[0119] In the embodiments of the present application, the machine room air conditioner can be used for refrigeration. In the process of refrigeration Figure 7 The structure shown can exist in three working modes, including a compressor mode, a fluorine pump mode, and a mixed mode.

[0120] In the compressor mode, the compressor operates normally and the fluorine pump stops operating. Specifically, this mode can be used in a scenario where the outdoor environment temperature is higher than the indoor temperature. In this mode, the compressor is used to convert electrical energy into mechanical energy to compress the refrigerant. The compressor converts the low-temperature and low-pressure gaseous refrigerant flowing out of the evaporator into high-temperature and high-pressure gaseous refrigerant while ensuring the flow of the refrigerant. The high-temperature and high-pressure gaseous refrigerant can first flow to the oil separator through the discharge pipe of the compressor. The oil separator can separate the mixed lubricating oil in the high-temperature and high-pressure gaseous refrigerant, and the separated lubricating oil can return to the bottom oil tank of the compressor. The gaseous refrigerant separated by the oil separator can enter the condenser through the exhaust one-way valve. The condenser can condense the high-temperature and high-pressure gaseous refrigerant into subcooled medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant can enter the electronic expansion valve, which can control the flow of the refrigerant by controlling the size of the opening. The electronic expansion valve can expand the medium-temperature and high-pressure liquid refrigerant into low-temperature and low-pressure liquid refrigerant, so that its saturation temperature is lower than the temperature of the refrigeration space. The low-temperature and low-pressure liquid refrigerant can enter the evaporator, which can use the low-temperature and low-pressure liquid refrigerant to absorb the heat in the room, evaporate the low-temperature and low-pressure liquid refrigerant into over-heated low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant can flow back to the compressor, thus forming a refrigeration cycle.

[0121] In the fluorine pump mode, the fluorine pump operates and the compressor stops operating. Specifically, this mode can be used in a scenario where the outdoor environment temperature is relatively high and reaches the set temperature of the machine room air conditioner. In this mode, the refrigerant after heat exchange with the indoor air in the evaporator can directly enter the condenser for heat exchange with the outdoor cold source. The refrigerant cooled into a liquid state by the condenser can return to the evaporator under the action of the fluorine pump to continue heat exchange, achieving the effect of refrigeration and energy saving.

[0122] In the mixed mode, the compressor operates and the fluorine pump also operates. Specifically, this mode can be used in a scenario where the outdoor environment temperature is lower than the set temperature. In this mode, the compressor operates at a variable frequency, and the compressor operates at a slow speed to achieve the effect of energy saving.

[0123] As shown in Figure 6 The method of the present application can include the following steps:

[0124] S601, when sending a shutdown instruction to the compressor, controlling the electronic expansion valve to be in a closed state, and controlling the compressor to operate at a second preset speed.

[0125] It is easy to understand that the stop command refers to a command for controlling the compressor to suspend operation.

[0126] The second preset rotating speed can be the number of rotations of the compressor in a unit of time. The second preset rotating speed is a low rotating speed.

[0127] During the refrigeration process of the compressor, there can be a high-speed rotating process, a low-speed rotating process, and a suspended rotating process. For example, when the indoor real temperature is far from the set temperature in the refrigeration stage, the compressor can be in a high-speed rotating process to speed up the refrigeration; when the machine room air conditioner is in a preheating state, the compressor can be in a low-speed rotating process, so that the subsequent refrigeration demand can be met more quickly and effectively; when the indoor real temperature is equal to the set temperature in the refrigeration stage, the compressor can be in a suspended rotating process.

[0128] Specifically, when the controller of the machine room air conditioner detects that the compressor can be stopped, a stop command can be sent to the compressor, so that the compressor can perform corresponding operations according to the stop command. When the stop command is sent to the compressor, the electronic expansion valve can be controlled to be in a closed state, and the compressor can be controlled to operate at a second preset rotating speed. After receiving the stop command, the compressor can operate at the second preset rotating speed. Since the electronic expansion valve has been closed at this time, the refrigerant in the outdoor unit and the pipeline has been cut off and cannot directly return to the evaporator, and cannot return to the exhaust pipe of the compressor, so that the compressor operates at the second preset rotating speed, which can reduce or even empty the refrigerant migrated from the evaporator to the compressor, thereby achieving the function of emptying the refrigerant in the evaporator. Since there is no refrigerant in the evaporator, the refrigerant will not migrate to the compressor in the future.

[0129] S602, when the evaporating pressure of the evaporator is in a preset pressure range, the compressor is controlled to be in a stopped state, and the first port of the electric three-way valve and the second port of the electric three-way valve are controlled to be conductive.

[0130] In some embodiments, during the process that the compressor operates at the second preset rotating speed, the second preset rotating speed is a low rotating speed, which can gradually reduce the refrigerant migrated from the evaporator to the compressor, until when the evaporating pressure of the evaporator is in a preset pressure range, the compressor is controlled to be in a stopped state, that is, the compressor is controlled to stop rotating, and the first port of the electric three-way valve and the second port of the electric three-way valve are controlled to be conductive. In this way, since the first port of the electric three-way valve and the second port of the electric three-way valve are conductive, and the third port for connecting the compressor return gas pipe and the first port for the evaporator outlet are in a disconnected state, the inflow of the refrigerant into the compressor can be completely cut off, which not only can prevent the refrigerant from entering the compressor from the evaporator, but also can effectively prevent the refrigerant from entering the compressor from the exhaust side by installing an exhaust one-way valve on the exhaust side of the compressor.

[0131] S603, when it is detected that the compressor is in the shutdown state and the fluorine pump is not in the running state, the oil sump temperature of the compressor is acquired.

[0132] In some embodiments, in the case that the compressor is in the shutdown state and the fluorine pump is also not running, the temperature of the lubricating oil in the bottom oil sump of the compressor can be acquired by the temperature sensor installed on the compressor.

[0133] S604, the outdoor environment temperature is acquired, and the outdoor environment temperature is determined as the reference temperature.

[0134] In some embodiments, in the case that the oil sump temperature of the compressor is acquired, the outdoor environment temperature can be monitored by the temperature sensor installed on the condenser, and then the outdoor environment temperature can be determined as the reference temperature.

[0135] S605, the middle temperature of the evaporator is acquired, and the middle temperature is determined as the reference temperature.

[0136] In some embodiments, in the case that the oil sump temperature of the compressor is acquired, the middle temperature of the evaporator can be monitored by the temperature sensor installed on the evaporator, and then the middle temperature can be determined as the reference temperature.

[0137] S606, when the difference between the oil sump temperature and the reference temperature is less than or equal to the temperature threshold value, the second port of the electric three-way valve is controlled to be conductive with the third port of the electric three-way valve.

[0138] In some embodiments, after the oil sump temperature and the reference temperature are acquired, the difference between the oil sump temperature and the reference can be calculated. When the difference between the oil sump temperature and the reference temperature is less than or equal to the temperature threshold value, the second port of the electric three-way valve can be controlled to be conductive with the third port of the electric three-way valve.

[0139] S607, the compressor is controlled to preheat at a first preset rotating speed based on the conductive state of the second port and the third port.

[0140] In some embodiments, in the case that the second port and the third port of the electric three-way valve are in the conductive state, the compressor can realize local running, and therefore the compressor can be controlled to run at a first preset rotating speed to preheat the cavity of the compressor. That is, the compressor is at a first preset rotating speed, which can make the temperature in the cavity of the compressor rise, so that the oil sump of the compressor can be controlled within a certain temperature range, so that the refrigerant dissolved in the refrigeration oil can be separated out, and then there will be no refrigerant in the compressor, achieving the effect of effectively preventing the refrigerant from migrating to the compressor.

[0141] S608, when it is detected that the compressor is in the shutdown state and the fluorine pump is in the running state, the first port of the electric three-way valve is controlled to be in conduction with the second port of the electric three-way valve.

[0142] In some embodiments, when it is detected that the compressor is in the shutdown state and the fluorine pump is in the running state, the first port of the electric three-way valve can be controlled to be in conduction with the second port of the electric three-way valve. In this way, since the first port of the electric three-way valve is in conduction with the second port, and the third port for connecting the compressor return gas pipe is in a disconnected state with the first port for the evaporator outlet, the flow of refrigerant into the compressor can be completely cut off, on the one hand, refrigerant from the evaporator into the compressor can be completely prevented, and on the other hand, the exhaust one-way valve installed on the exhaust side of the compressor can effectively prevent the refrigerant from entering the compressor from the exhaust side. Moreover, in the case that the fluorine pump is running and the compressor is shutdown, the refrigerant after heat exchange with indoor air in the evaporator can directly enter the condenser to exchange heat with outdoor cold source, and the refrigerant cooled to liquid state in the condenser can return to the evaporator to continue heat exchange under the action of the fluorine pump, so as to achieve the effect of refrigeration and energy saving.

[0143] S609, when it is detected that the compressor is in the running state, the first port of the electric three-way valve is controlled to be in conduction with the third port of the electric three-way valve.

[0144] It is easy to understand that the running state of the compressor can refer to the state that the compressor operates at a high speed to achieve refrigeration.

[0145] In some embodiments, when it is detected that the compressor is in the running state, the first port of the electric three-way valve can be controlled to be in conduction with the third port of the electric three-way valve, so that the refrigerant compressed by the compressor enters the condenser for cooling, and then passes through the expansion valve to reduce the pressure, and the refrigerant after pressure reduction enters the evaporator, the evaporator absorbs the heat of indoor air to achieve the effect of refrigeration, and finally the refrigerant processed by the evaporator enters the compressor, and the above processing process is repeated to achieve the effect of continuous refrigeration.

[0146] S610, obtaining the condensing pressure of the condenser.

[0147] S611, when the condensing pressure is less than or equal to the pressure threshold value, the compressor is controlled to operate at a third preset speed.

[0148] S612, when the condensing pressure is greater than the pressure threshold value, the compressor is controlled to be in the shutdown state.

[0149] The following explains S610-S612.

[0150] In some embodiments, in the scenario of low outdoor temperature, the condensing pressure of the condenser can be detected in real time, the condensing pressure can be monitored in real time, and when it is monitored that the condensing pressure is less than or equal to the pressure threshold, the compressor can be controlled to operate at a third preset rotating speed to achieve refrigeration, at this time, the machine room air conditioner enters a preheating mode, the outdoor fan remains closed, and the state of the electric three-way valve can be that the first port and the second port are conductive. In this state, when it is monitored that the condensing pressure is greater than the pressure threshold, the machine room air conditioner can exit the preheating mode, at this time, the compressor can be controlled to be in a shutdown state, that is, the compressor is no longer controlled to operate at the third preset rotating speed, and the compressor is no longer controlled to rotate and operate. In this way, it can be ensured that the condensing pressure is greater than the pressure threshold, so that when the machine room air conditioner has a refrigeration demand, the compressor can quickly establish a high-low pressure difference for normal start, achieving the effect of fast start refrigeration.

[0151] In some embodiments, in the scenario of low outdoor temperature, when it is monitored that the condensing pressure is greater than the pressure threshold, the compressor can be controlled to be in a shutdown state, at this time, the machine room air conditioner does not need to enter the preheating mode. In this case, the condensing pressure is greater than the pressure threshold, and the compressor can quickly establish a high-low pressure difference for normal start, without affecting the fast start of the compressor to achieve refrigeration.

[0152] In the embodiments of the present application, the electric three-way valve is arranged on the return gas side of the compressor, which can support three modes of the compressor mode, the fluorine pump mode and the mixed mode for refrigeration. The state of the compressor and the state of the fluorine pump can be monitored at the same time, and the electric three-way valve can be flexibly controlled to be in different conduction states according to the states thereof. On the one hand, when the compressor is in a shutdown state and the fluorine pump is not in an operating state, and it is detected that the difference between the oil tank temperature and the reference temperature is small, the second port and the third port of the electric three-way valve are controlled to be conductive, the compressor can be controlled to operate at a first preset rotating speed for preheating, so that the compressor can operate in a local loop, so that the compressor oil tank temperature can be controlled within a certain temperature range, so that the refrigerant dissolved in the refrigeration oil can be separated out, so that there is no refrigerant in the compressor, achieving the effect of effectively preventing the refrigerant from migrating to the compressor, avoiding various compressor problems caused by the refrigerant in the compressor. On the other hand, when the compressor is in a shutdown state and the fluorine pump is in an operating state, the first port and the second port of the electric three-way valve can be controlled to be conductive, achieving the operation of the fluorine pump mode, and achieving the effect of refrigeration and energy saving. In addition, when the compressor is in an operating state, the first port and the third port of the electric three-way valve can be controlled to be conductive, and the compressor can be controlled to operate at a high speed to achieve the effect of refrigeration. Moreover, when it is monitored that the condensing pressure of the outdoor unit is too low, the machine room air conditioner enters a preheating mode, the compressor is controlled to operate at a certain rotating speed so that the condensing pressure reaches a pressure threshold, so that when there is a refrigeration demand, the compressor can quickly establish a high-low pressure difference for normal start, achieving the effect of fast start refrigeration.

[0153] Please refer to Figure 8 A structural schematic diagram of a machine room air conditioner control device is provided for an embodiment of the present application. The machine room air conditioner control device 800 can be realized by software, hardware or a combination of both to become all or part of an electrical appliance. The machine room air conditioner control device 800 comprises:

[0154] The temperature acquisition module 810 is configured to acquire the oil sump temperature of the compressor and acquire a reference temperature when it is detected that the compressor is in a shutdown state.

[0155] The first control module 820 is configured to control the first port of the electric three-way valve to be conductive with the second port of the electric three-way valve when the difference between the oil sump temperature and the reference temperature is less than or equal to a temperature threshold.

[0156] The second control module 830 is configured to control the compressor to preheat at a first preset rotating speed based on the conductive state of the first port and the second port.

[0157] Optionally, the machine room air conditioner control device further comprises:

[0158] The third control module is configured to control the electronic expansion valve to be in a closed state and control the compressor to operate at a second preset rotating speed when a shutdown instruction is sent to the compressor.

[0159] The fourth control module is configured to control the compressor to be in a shutdown state and control the first port of the electric three-way valve to be conductive with the second port of the electric three-way valve when the evaporator pressure is in a preset pressure interval.

[0160] Optionally, the machine room air conditioner control device further comprises:

[0161] The third control module is configured to control the first port of the electric three-way valve to be conductive with the third port of the electric three-way valve when it is detected that the compressor is in an operating state.

[0162] Optionally, the temperature acquisition module is specifically configured to:

[0163] Acquire an outdoor environment temperature and determine the outdoor environment temperature as the reference temperature; or

[0164] Acquire a middle temperature of the evaporator and determine the middle temperature as the reference temperature.

[0165] Optionally, the machine room air conditioner control device further comprises:

[0166] The pressure detection module is configured to acquire the condenser pressure.

[0167] The first pressure control module is used to control the compressor to operate at a third preset speed when the condensing pressure is less than or equal to the pressure threshold.

[0168] The second pressure control module is used to control the compressor to stop when the condensing pressure is greater than the pressure threshold.

[0169] Please see Figure 9 This is a schematic diagram of the structure of a computer room air conditioning control device provided in an embodiment of this application. Figure 9 As shown, the system includes a controller 900, a condenser 940, an electronic expansion valve 950, an evaporator 960, a compressor 910, an oil separator 920, an electric three-way valve 930, a temperature sensor 941 in the condenser 940, a condensing pressure detection device 942 around the condenser 940, a temperature sensor 961 in the evaporator 960, and a temperature sensor 911 in the compressor 910. The controller 900 is electrically connected to all the other components. The physical connections between the components other than the controller 900 are shown in the connection structure indicated by the rectangle on the right side of the figure. Specifically, the compressor's discharge pipe is connected to the inlet of the oil separator, the first port of the electric three-way valve is connected to the outlet of the oil separator, the second port of the electric three-way valve is connected to the compressor's return pipe, the third port of the electric three-way valve is connected to the condenser's inlet, the condenser is connected to the evaporator via the electronic expansion valve, and the evaporator's outlet is connected to the compressor's return pipe.

[0170] The computer room air conditioning control device 900 can be integrated into all or part of the electrical equipment through software, hardware, or a combination of both. The controller in the computer room air conditioning control device 900 is used for:

[0171] When the compressor is detected to be in a stopped state, the oil tank temperature of the compressor is obtained, and a reference temperature is obtained;

[0172] When the difference between the oil tank temperature and the reference temperature is less than or equal to the temperature threshold, the first port of the electric three-way valve is connected to the second port of the electric three-way valve.

[0173] Based on the conduction state of the first port and the second port, the compressor is controlled to preheat at a first preset speed.

[0174] Optionally, the controller in the computer room air conditioning control device 900 is also used for:

[0175] When a shutdown command is sent to the compressor, the electronic expansion valve is controlled to be closed, and the compressor is controlled to run at a second preset speed.

[0176] When the evaporating pressure of the evaporator is in a preset pressure interval, the controller controls the compressor to be in a shutdown state, and controls the first port of the electric three-way valve to be in conduction with the second port of the electric three-way valve.

[0177] Optionally, the controller in the machine room air conditioner control device 900 is further configured to:

[0178] When it is detected that the compressor is in an operating state, the controller controls the first port of the electric three-way valve to be in conduction with the third port of the electric three-way valve.

[0179] Optionally, when acquiring the reference temperature, the controller in the machine room air conditioner control device 900 is specifically configured to:

[0180] acquire an outdoor environment temperature, and determine the outdoor environment temperature as the reference temperature; or,

[0181] acquire a middle temperature of the evaporator, and determine the middle temperature as the reference temperature.

[0182] Optionally, the controller in the machine room air conditioner control device 900 is further configured to:

[0183] acquire a condensing pressure of the condenser;

[0184] When the condensing pressure is less than or equal to a pressure threshold value, the controller controls the compressor to operate at a third preset rotating speed;

[0185] When the condensing pressure is greater than the pressure threshold value, the controller controls the compressor to be in a shutdown state.

[0186] Please refer to Figure 10 , a structural schematic diagram of a machine room air conditioner control device provided by the embodiment of the present application. The machine room air conditioner control device 1000 can be realized by software, hardware or a combination of both to become all or part of an electrical appliance. The machine room air conditioner control device 1000 comprises:

[0187] a temperature acquisition module 1001 configured to, when it is detected that the compressor is in a shutdown state, acquire an oil tank temperature of the compressor and acquire a reference temperature;

[0188] a first control module 1002 configured to, when a difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold value, control the second port of the electric three-way valve to be in conduction with the third port of the electric three-way valve;

[0189] a first control module 1003 configured to control the compressor to preheat at a first preset rotating speed based on the conduction state of the second port and the third port.

[0190] Optionally, the temperature acquisition module is configured to:

[0191] acquiring a sump temperature of the compressor when it is detected that the compressor is in the shutdown state and the fluorine pump is not in the running state.

[0192] Optionally, the machine room air conditioner control device further comprises:

[0193] a third control module configured to control the first port of the electric three-way valve to be conductive with the second port of the electric three-way valve when it is detected that the compressor is in the shutdown state and the fluorine pump is in the running state.

[0194] Optionally, the machine room air conditioner control device further comprises:

[0195] a fourth control module configured to control the electronic expansion valve to be in the closed state and control the compressor to run at a second preset rotating speed when a shutdown instruction is sent to the compressor.

[0196] a fifth control module configured to control the compressor to be in the shutdown state and control the first port of the electric three-way valve to be conductive with the second port of the electric three-way valve when the evaporating pressure of the evaporator is in a preset pressure range.

[0197] Optionally, the machine room air conditioner control device further comprises:

[0198] a sixth control module configured to control the first port of the electric three-way valve to be conductive with the third port of the electric three-way valve when it is detected that the compressor is in the running state.

[0199] Optionally, the temperature acquisition module is configured to:

[0200] acquire an outdoor environment temperature and determine the outdoor environment temperature as the reference temperature; or

[0201] acquire a middle temperature of the evaporator and determine the middle temperature as the reference temperature.

[0202] Optionally, the machine room air conditioner control device further comprises:

[0203] a pressure detection module configured to acquire a condensing pressure of the condenser.

[0204] a first pressure control module configured to control the compressor to run at a third preset rotating speed when the condensing pressure is less than or equal to a pressure threshold.

[0205] a second pressure control module configured to control the compressor to be in the shutdown state when the condensing pressure is greater than the pressure threshold.

[0206] Please refer to Figure 11 , a structural schematic diagram of a machine room air conditioner control device provided by the embodiment of the present application.

[0207] As shown in Figure 11 the controller 1100, the condenser 1140, the electronic expansion valve 1150, the evaporator 1160, the electric three-way valve 1170, the compressor 1110, the oil separator 1120, the exhaust one-way valve 1130, and the temperature sensor 1141 in the condenser 1140, the condensing pressure detection device 1142 around the condenser 1140, the temperature sensor 1161 in the evaporator 1160, and the temperature sensor 1111 in the compressor 1110. Among them, the controller 1100 is electrically connected with the remaining devices. The physical connection relationship between the remaining devices except the controller 1100 can be referred to the connection structure in the right rectangle in Figure 11 . Specifically, the exhaust pipe of the compressor is connected with the inlet of the oil separator, the oil separator is connected with the condenser through the exhaust one-way valve, the condenser is connected with the evaporator through the electronic expansion valve, the outlet of the evaporator is connected with the first port of the electric three-way valve, the second port of the electric three-way valve is connected with the outlet of the exhaust one-way valve, and the third port of the electric three-way valve is connected with the gas return pipe of the compressor.

[0208] The machine room air conditioner control device 1100 can be realized by software, hardware or a combination of both to become all or part of an electrical appliance. The controller in the machine room air conditioner control device 1100 is used to:

[0209] When it is detected that the compressor is in a shutdown state, the oil sump temperature of the compressor is obtained, and a reference temperature is obtained;

[0210] When the difference between the oil sump temperature and the reference temperature is less than or equal to a temperature threshold, the second port of the electric three-way valve is controlled to be conductive with the third port of the electric three-way valve;

[0211] The compressor is controlled to preheat at a first preset rotating speed based on the conductive state of the second port and the third port.

[0212] Optionally, the controller in the machine room air conditioner control device 1100 is specifically used to:

[0213] When it is detected that the compressor is in a shutdown state, and the fluorine pump is not in a running state, the oil sump temperature of the compressor is obtained.

[0214] Optionally, the controller in the machine room air conditioner control device 1100 is further used to:

[0215] When it is detected that the compressor is in a shutdown state, and the fluorine pump is in a running state, the first port of the electric three-way valve is controlled to be conductive with the second port of the electric three-way valve.

[0216] Optionally, the controller in the machine room air conditioner control device 1100 is further configured to:

[0217] when a stop command is sent to the compressor, control the electronic expansion valve to be in a closed state, and control the compressor to operate at a second preset rotating speed;

[0218] when the evaporation pressure of the evaporator is in a preset pressure range, control the compressor to be in a stop state, and control the first port of the electric three-way valve to be conductive with the second port of the electric three-way valve.

[0219] Optionally, the controller in the machine room air conditioner control device 1100 is further configured to:

[0220] when it is detected that the compressor is in an operating state, control the first port of the electric three-way valve to be conductive with the third port of the electric three-way valve.

[0221] Optionally, the controller in the machine room air conditioner control device 1100 is configured to, when acquiring the reference temperature, specifically:

[0222] acquire an outdoor environment temperature, and determine the outdoor environment temperature as the reference temperature; or,

[0223] acquire a middle temperature of the evaporator, and determine the middle temperature as the reference temperature.

[0224] Optionally, the controller in the machine room air conditioner control device 1100 is further configured to:

[0225] acquire a condensing pressure of the condenser;

[0226] when the condensing pressure is less than or equal to a pressure threshold, control the compressor to operate at a third preset rotating speed;

[0227] when the condensing pressure is greater than the pressure threshold, control the compressor to be in a stop state

[0228] Please refer to Figure 12 , Figure 12 A structural schematic diagram of an electric appliance device provided in the embodiment of the present application. In the embodiment of the present application, the electric appliance device can be a machine room air conditioner. As shown in Figure 12 , the electric appliance device 1200 can include at least one processor 1201, at least one network interface 1204, a user interface 1203, a memory 1205, and at least one communication bus 1202.

[0229] The communication bus 1202 is configured to realize the connection and communication among the components.

[0230] The user interface 1203 can include a camera, and the optional user interface 503 can further include a standard wired interface and a wireless interface.

[0231] The network interface 1204 can optionally include a standard wired interface and a wireless interface (e.g., a WI-FI interface).

[0232] The processor 1201 can include one or more processing cores. The processor 1201 connects various parts of the entire electrical appliance 1200 through various interfaces and lines, processes data and various functions of the electrical appliance 1200 by running or executing instructions, programs, code sets or instruction sets stored in the memory 1205, and calling data stored in the memory 1205. Optionally, the processor 1201 can be implemented in at least one of a digital signal processing (DSP), a field-programmable gate array (FPGA), and a programmable logic array (PLA). The processor 1201 can be integrated with one or a combination of a central processing unit (CPU) and a modem. The CPU is mainly used to process an operating system, a display screen, etc., and the modem is used to process wireless communication. It can be understood that the above-mentioned modem can also not be integrated into the processor 1201, but can be implemented by a separate chip.

[0233] The memory 1205 can include a random access memory (RAM) and a read-only memory (ROM). Optionally, the memory 1205 includes a non-transitory computer-readable storage medium. The memory 1205 can be used to store instructions, programs, codes, code sets or instruction sets. The memory 1205 can include a program storage area and a data storage area. The program storage area can store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, etc.), instructions for implementing the above-mentioned various method embodiments, etc. The data storage area can store data related to the above-mentioned various method embodiments, etc. The memory 1205 can optionally be at least one storage device located away from the above-mentioned processor 1201. As shown, the memory 1205 as a computer storage medium can include an operating system, a network communication module, a user interface module, and a computer room air conditioner control method program. Figure 2 As shown, the memory 1205 as a computer storage medium can include an operating system, a network communication module, a user interface module, and a computer room air conditioner control method program.

[0234] In Figure 12 In the electrical appliance 1200 shown, the user interface 1203 is mainly used to provide an interface for user input, and obtain data input by the user; and the processor 1201 can be used to call a program of the machine room air conditioner control method stored in the storage 1205, and specifically perform the following operations:

[0235] When it is detected that the compressor is in a shutdown state, an oil sump temperature of the compressor is obtained, and a reference temperature is obtained;

[0236] When a difference between the oil sump temperature and the reference temperature is less than or equal to a temperature threshold, the first port of the electric three-way valve is controlled to be conductive with the second port of the electric three-way valve.

[0237] The compressor is controlled to preheat at a first preset rotating speed based on a conductive state of the first port and the second port.

[0238] In an embodiment, before the processor 1201 performs the operation of obtaining the oil sump temperature of the compressor when it is detected that the compressor is in the shutdown state, the processor 1201 further performs the following operation:

[0239] When a shutdown instruction is sent to the compressor, the electronic expansion valve is controlled to be in a closed state, and the compressor is controlled to operate at a second preset rotating speed.

[0240] When an evaporation pressure of the evaporator is in a preset pressure range, the compressor is controlled to be in the shutdown state, and the first port of the electric three-way valve is controlled to be conductive with the second port of the electric three-way valve.

[0241] In an embodiment, the processor 1201 further performs the following operation:

[0242] When it is detected that the compressor is in an operating state, the first port of the electric three-way valve is controlled to be conductive with the third port of the electric three-way valve.

[0243] In an embodiment, when the processor 1201 performs the operation of obtaining the reference temperature, the processor 1201 specifically performs the following operation:

[0244] An outdoor environment temperature is obtained, and the outdoor environment temperature is determined as the reference temperature; or

[0245] A middle temperature of the evaporator is obtained, and the middle temperature is determined as the reference temperature.

[0246] In an embodiment, the processor 1201 further performs the following operation:

[0247] A condensing pressure of the condenser is obtained.

[0248] when the condensing pressure is less than or equal to a pressure threshold, controlling the compressor to operate at a third preset rotating speed;

[0249] when the condensing pressure is greater than the pressure threshold, controlling the compressor to be in a shutdown state.

[0250] In addition, those skilled in the art can understand that the structure of the electrical appliance 1200 shown in the above-mentioned drawings does not constitute a limitation on the electrical appliance 1200, and the electrical appliance can include more or fewer components than the drawings, or combine certain components, or different component arrangements. For example, the electrical appliance 1200 also includes radio frequency circuitry, audio circuitry, WiFi components, power supplies, Bluetooth components, and the like, which are not described here.

[0251] Please refer to Figure 13 , Figure 13 A structural schematic diagram of an electrical appliance provided in an embodiment of the present application. In the embodiment of the present application, the electrical appliance can be a machine room air conditioner. As shown in Figure 13 The electrical appliance 1300 can include at least one processor 1301, at least one network interface 1304, a user interface 1303, a memory 1305, and at least one communication bus 1302.

[0252] The communication bus 1302 is used to realize the connection and communication between the components.

[0253] The user interface 1303 can include a camera, and the optional user interface 1303 can also include a standard wired interface, a wireless interface.

[0254] The network interface 1304 can optionally include a standard wired interface, a wireless interface (such as a WI-FI interface).

[0255] The processor 1301 may include one or more processing cores. The processor 501 connects to various parts within the electrical device 1300 using various interfaces and lines, and performs various functions and processes data by running or executing instructions, programs, code sets, or instruction sets stored in the memory 1305, and by calling data stored in the memory 1305. Optionally, the processor 1301 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 1301 may integrate one or more of the following: a Central Processing Unit (CPU) and a modem. The CPU primarily handles the operating system, display screen, etc.; the modem is used for wireless communication. It is understood that the modem may also not be integrated into the processor 1301 and may be implemented as a separate chip.

[0256] The memory 1305 may include random access memory (RAM) or read-only memory. Optionally, the memory 1305 may include a non-transitory computer-readable storage medium. The memory 1305 can be used to store instructions, programs, code, code sets, or instruction sets. The memory 1305 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as touch functionality, sound playback functionality, etc.), instructions for implementing the various method embodiments described above, etc.; the data storage area may store data involved in the various method embodiments described above, etc. Optionally, the memory 1305 may also be at least one storage device located remotely from the aforementioned processor 501. Figure 13 As shown, the memory 1305, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and a program for controlling the computer room air conditioning.

[0257] exist Figure 13 In the electrical device 1300 shown, the user interface 1303 is mainly used to provide an input interface for the user and to obtain the user input data; while the processor 1301 can be used to call the program of the computer room air conditioning control method stored in the memory 1305, and specifically perform the following operations:

[0258] acquire a sump temperature of the compressor when it is detected that the compressor is in a shutdown state, and acquire a reference temperature;

[0259] control a second port of the electric three-way valve to be conductive with a third port of the electric three-way valve when a difference between the sump temperature and the reference temperature is less than or equal to a temperature threshold;

[0260] control the compressor to preheat at a first preset rotating speed based on a conductive state of the second port and the third port.

[0261] In an embodiment, the machine room air conditioner further comprises a liquid reservoir, a fluorine pump, and a bypass one-way valve, the condenser is connected with the electronic expansion valve in sequence through the liquid reservoir, the fluorine pump, and the electronic expansion valve, the bypass one-way valve is connected with the fluorine pump in parallel, and the processor 1301 specifically performs the following operation when executing the acquiring the sump temperature of the compressor when it is detected that the compressor is in the shutdown state:

[0262] acquire the sump temperature of the compressor when it is detected that the compressor is in the shutdown state and the fluorine pump is not in an operating state.

[0263] In an embodiment, the processor 1301 further performs the following operation:

[0264] control a first port of the electric three-way valve to be conductive with a second port of the electric three-way valve when it is detected that the compressor is in the shutdown state and the fluorine pump is in the operating state.

[0265] In an embodiment, the processor 1301 further performs the following operation before executing the acquiring the sump temperature of the compressor when it is detected that the compressor is in the shutdown state:

[0266] control the electronic expansion valve to be in a closed state and control the compressor to operate at a second preset rotating speed when a shutdown instruction is sent to the compressor;

[0267] control the compressor to be in the shutdown state and control a first port of the electric three-way valve to be conductive with a second port of the electric three-way valve when an evaporating pressure of the evaporator is in a preset pressure range.

[0268] In an embodiment, the processor 1301 further performs the following operation:

[0269] control a first port of the electric three-way valve to be conductive with a third port of the electric three-way valve when it is detected that the compressor is in an operating state.

[0270] In an embodiment, the processor 1301 specifically performs the following operation when executing the acquiring the reference temperature:

[0271] obtaining an outdoor environment temperature, and determining the outdoor environment temperature as the reference temperature; or

[0272] obtaining a middle portion temperature of the evaporator, and determining the middle portion temperature as the reference temperature.

[0273] In one embodiment, the processor 1301 further performs the following operations:

[0274] obtaining a condensing pressure of the condenser;

[0275] controlling the compressor to operate at a third preset rotating speed when the condensing pressure is less than or equal to a pressure threshold value;

[0276] controlling the compressor to be in a shutdown state when the condensing pressure is greater than the pressure threshold value

[0277] In addition, those skilled in the art can understand that the structure of the electrical appliance 1300 shown in the above-mentioned drawings does not constitute a limitation on the electrical appliance 1300, and the electrical appliance can include more or fewer components than the drawings, or combine certain components, or different component arrangements. For example, the electrical appliance 1300 also includes radio frequency circuitry, audio circuitry, WiFi components, power supplies, Bluetooth components, and the like, which are not described here.

[0278] The embodiments of the present application also provide a computer readable storage medium, which stores at least one instruction, and the at least one instruction is used to be executed by a processor to implement the computer room air conditioner control method according to the above-mentioned various embodiments.

[0279] The embodiments of the present application also provide a computer program product, which stores at least one instruction, and the at least one instruction is loaded and executed by the processor to implement the computer room air conditioner control method according to the above-mentioned various embodiments.

[0280] Those skilled in the art can understand that the functions described in the above-mentioned one or more examples can be realized by hardware, software, firmware or any combination thereof. When realized by software, these functions can be stored in a computer readable medium or transmitted as one or more instructions or codes on a computer readable medium. The computer readable medium includes a computer storage medium and a communication medium, wherein the communication medium includes any medium that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that can be accessed by a general or special purpose computer.

[0281] The above merely provides the optional embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for controlling a computer room air conditioner, applied to a computer room air conditioner, characterized in that, The machine room air conditioner comprises a compressor, an oil separator, a condenser, an electronic expansion valve and an evaporator, a three-way valve is arranged on the exhaust side of the compressor, the exhaust pipe of the compressor is connected with the inlet of the oil separator, the first port of the three-way valve is connected with the outlet of the oil separator, the second port of the three-way valve is connected with the gas return pipe of the compressor, the third port of the three-way valve is connected with the inlet of the condenser, the condenser is connected with the evaporator through the electronic expansion valve, the outlet of the evaporator is connected with the gas return pipe of the compressor, and the method comprises: When it is detected that the compressor is in a shutdown state, the oil tank temperature of the compressor is acquired, and a reference temperature is acquired; When the difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold, the first port of the three-way valve is controlled to be conductive with the second port of the three-way valve; The first preset rotating speed of the compressor is controlled based on the conductive state of the first port and the second port.

2. The method of claim 1, wherein, Before the step of acquiring the oil tank temperature of the compressor when it is detected that the compressor is in a shutdown state, the method further comprises: When a shutdown instruction is sent to the compressor, the electronic expansion valve is controlled to be in a closed state, and the compressor is controlled to operate at a second preset rotating speed; When the evaporation pressure of the evaporator is in a preset pressure interval, the compressor is controlled to be in a shutdown state, and the first port of the three-way valve is controlled to be conductive with the second port of the three-way valve.

3. The method of claim 1, wherein, The method further comprises: When it is detected that the compressor is in an operating state, the first port of the three-way valve is controlled to be conductive with the third port of the three-way valve.

4. The method of claim 1, wherein, The step of acquiring the reference temperature comprises: An outdoor environment temperature is acquired, and the outdoor environment temperature is determined as the reference temperature; or A middle temperature of the evaporator is acquired, and the middle temperature is determined as the reference temperature.

5. The method according to any one of claims 1 to 4, characterized in that, The method further comprises: A condensing pressure of the condenser is acquired; When the condensing pressure is less than or equal to a pressure threshold, the compressor is controlled to operate at a third preset rotating speed; When the condensing pressure is greater than the pressure threshold, the compressor is controlled to be in a shutdown state.

6. A machine room air conditioner control method applied to a machine room air conditioner, characterized by, The machine room air conditioner comprises a compressor, an oil separator, a one-way exhaust valve, a condenser, an electronic expansion valve and an evaporator, a three-way valve is arranged on the gas return side of the compressor, the exhaust pipe of the compressor is connected with the inlet of the oil separator, the oil separator is connected with the condenser through the one-way exhaust valve, the condenser is connected with the evaporator through the electronic expansion valve, the outlet of the evaporator is connected with the first port of the three-way valve, the second port of the three-way valve is connected with the outlet of the one-way exhaust valve, the third port of the three-way valve is connected with the gas return pipe of the compressor, and the method comprises: When it is detected that the compressor is in a shutdown state, the oil tank temperature of the compressor is acquired, and a reference temperature is acquired; When the difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold, the first port of the three-way valve is controlled to be conductive with the second port of the three-way valve; control the second port of the electric three-way valve and the third port of the electric three-way valve to be conductive when the difference between the oil groove temperature and the reference temperature is less than or equal to a temperature threshold value; control the compressor to preheat at a first preset rotating speed based on the conductive state of the second port and the third port.

7. The method of claim 6, wherein, The machine room air conditioner further comprises a liquid reservoir, a fluorine pump and a bypass one-way valve, the condenser is connected with the electronic expansion valve in sequence through the liquid reservoir, the fluorine pump and the electronic expansion valve, and the bypass one-way valve is connected with the fluorine pump in parallel. The method further comprises: When it is detected that the compressor is in the shutdown state, and the fluorine pump is in the running state, the first port of the electric three-way valve and the third port of the electric three-way valve are controlled to be conductive.

8. The method of claim 7, wherein, The method further comprises: When it is detected that the compressor is in the shutdown state, and the fluorine pump is in the running state, the first port of the electric three-way valve and the third port of the electric three-way valve are controlled to be conductive.

9. The method according to claim 6 or 7, characterized in that, The method further comprises: When a shutdown instruction is sent to the compressor, the electronic expansion valve is controlled to be in the closed state, and the compressor is controlled to run at a second preset rotating speed; When the evaporation pressure of the evaporator is in a preset pressure range, the compressor is controlled to be in the shutdown state, and the first port of the electric three-way valve and the second port of the electric three-way valve are controlled to be conductive.

10. The method of claim 6 or 7, wherein, The method further comprises: When it is detected that the compressor is in the running state, the first port of the electric three-way valve and the third port of the electric three-way valve are controlled to be conductive.

11. The method of claim 6 or 7, wherein, The method further comprises: The reference temperature is obtained by: obtaining an outdoor environment temperature, and determining the outdoor environment temperature as the reference temperature; or 12. The method of claim 6 or 7, wherein, obtaining a middle temperature of the evaporator, and determining the middle temperature as the reference temperature. The method further comprises: obtaining a condensing pressure of the condenser; When the condensing pressure is less than or equal to a pressure threshold value, the compressor is controlled to run at a third preset rotating speed; 13. A machine room air conditioner control device applied to a machine room air conditioner, characterized by, When the condensing pressure is greater than the pressure threshold value, the compressor is controlled to be in the shutdown state. The machine room air conditioner comprises a compressor, an oil separator, a condenser, an electronic expansion valve and an evaporator, an electric three-way valve is arranged on the exhaust side of the compressor, an exhaust pipe of the compressor is connected with the inlet of the oil separator, a first port of the electric three-way valve is connected with the outlet of the oil separator, a second port of the electric three-way valve is connected with a return air pipe of the compressor, a third port of the electric three-way valve is connected with the inlet of the condenser, the condenser is connected with the evaporator through the electronic expansion valve, the outlet of the evaporator is connected with the return air pipe of the compressor, and the device comprises: a temperature obtaining module, configured to obtain an oil groove temperature of the compressor and obtain a reference temperature when it is detected that the compressor is in the shutdown state; a first control module, configured to control the first port of the electric three-way valve and the second port of the electric three-way valve to be conductive when the difference between the oil groove temperature and the reference temperature is less than or equal to a temperature threshold value; A second control module is configured to control the compressor to preheat at a first preset rotating speed based on the conduction state of the first port and the second port.

14. A machine room air conditioner control device applied to a machine room air conditioner, characterized by, The machine room air conditioner comprises a compressor, an oil separator, a condenser, an electronic expansion valve, an evaporator and a controller, the exhaust side of the compressor is provided with an electric three-way valve, the exhaust pipe of the compressor is connected with the inlet of the oil separator, the first port of the electric three-way valve is connected with the outlet of the oil separator, the second port of the electric three-way valve is connected with the gas return pipe of the compressor, the third port of the electric three-way valve is connected with the inlet of the condenser, the condenser is connected with the evaporator through the electronic expansion valve, the outlet of the evaporator is connected with the gas return pipe of the compressor, the controller is connected with the compressor, the oil separator, the condenser, the electronic expansion valve and the evaporator respectively, and the controller is configured to: When it is detected that the compressor is in a shutdown state, an oil sump temperature of the compressor is acquired, and a reference temperature is acquired; When the difference between the oil sump temperature and the reference temperature is less than or equal to a temperature threshold, the first port of the electric three-way valve is controlled to be in conduction with the second port of the electric three-way valve; The compressor is controlled to preheat at a first preset rotating speed based on the conduction state of the first port and the second port.

15. A machine room air conditioner control device applied to a machine room air conditioner, characterized by, The machine room air conditioner comprises a compressor, an oil separator, a condenser, an electronic expansion valve, an evaporator and a controller, the exhaust side of the compressor is provided with an electric three-way valve, the exhaust pipe of the compressor is connected with the inlet of the oil separator, the exhaust pipe of the compressor is connected with the inlet of the oil separator, the first port of the electric three-way valve is connected with the outlet of the oil separator, the second port of the electric three-way valve is connected with the gas return pipe of the compressor, the third port of the electric three-way valve is connected with the inlet of the condenser, the condenser is connected with the evaporator through the electronic expansion valve, the outlet of the evaporator is connected with the gas return pipe of the compressor, the controller is connected with the compressor, the oil separator, the condenser, the electronic expansion valve and the evaporator respectively, and the controller is configured to: When it is detected that the compressor is in a shutdown state, an oil sump temperature of the compressor is acquired, and a reference temperature is acquired; When the difference between the oil sump temperature and the reference temperature is less than or equal to a temperature threshold, the first port of the electric three-way valve is controlled to be in conduction with the second port of the electric three-way valve; The compressor is controlled to preheat at a first preset rotating speed based on the conduction state of the first port and the second port.

16. A machine room air conditioner control device applied to a machine room air conditioner, characterized by, The machine room air conditioner comprises a compressor, an oil separator, an exhaust one-way valve, a condenser, an electronic expansion valve, an evaporator and a controller, a motor three-way valve is arranged on the gas return side of the compressor, the exhaust pipe of the compressor is connected with the inlet of the oil separator, the oil separator is connected with the condenser through the exhaust one-way valve, the condenser is connected with the evaporator through the electronic expansion valve, the outlet of the evaporator is connected with the first port of the motor three-way valve, the second port of the motor three-way valve is connected with the outlet of the exhaust one-way valve, the third port of the motor three-way valve is connected with the gas return pipe of the compressor, the controller is connected with the compressor, the oil separator, the condenser, the electronic expansion valve and the evaporator respectively, and the controller is used for: When it is detected that the compressor is in a shutdown state, the oil tank temperature of the compressor is acquired, and a reference temperature is acquired; When the difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold value, the second port of the motor three-way valve is controlled to be conductive with the third port of the motor three-way valve; The compressor is controlled to preheat at a first preset rotating speed based on the conductive state of the second port and the third port.

17. A computer storage medium, comprising, The computer storage medium stores a plurality of instructions, and the instructions are suitable for being loaded and executed by the processor.

18. An electrical appliance, characterized in that Comprise: A processor and a memory; wherein the memory stores a computer program, and the computer program is suitable for being loaded and executed by the processor to execute the method steps of any one of claims 1-5 or 6-12.

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