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

Abstract

The embodiment of the invention discloses a machine room air conditioner control method and device, a storage medium and electrical equipment, applied to a machine room air conditioner, an electric three-way valve is arranged on the exhaust side of a compressor, the electric three-way valve comprises a first port, a second port and a third port, the first port is connected with an outlet of an oil separator, and the second port is connected with an outlet of the oil separator; the second port is connected with an air return pipe of the compressor, and the third port is connected with an inlet of the condenser; the method comprises the steps that when it is detected that the compressor is in a shutdown state, the oil groove temperature of the compressor is obtained, and the reference temperature is obtained; when the difference value between the oil tank temperature and the reference temperature is smaller than or equal to the temperature threshold value, a first port of the electric three-way valve is controlled to be communicated with a second port of the electric three-way valve; and based on the conduction state of the first port and the second port, the compressor is controlled to conduct preheating according to the first preset rotating speed. According to the embodiment of the invention, the refrigerant can be effectively prevented from being migrated to the compressor, and various compressor problems caused by the refrigerant in the compressor are avoided.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a computer room air conditioning control method, device, storage medium and electrical equipment. Background Art

[0002] Computer room air conditioners are special air conditioners designed for modern electronic equipment rooms. Computer room air conditioners can not only control the temperature of the computer room, but also the humidity of the computer room. Computer room air conditioners are important equipment in the computer room.

[0003] The design of computer room air conditioners is to precisely control temperature and humidity. Therefore, computer room air conditioners have high reliability, can ensure continuous operation throughout the year, and have maintainability, assembly flexibility and redundancy. Computer room precision air conditioners are widely used in high-precision environments such as computer rooms, programmable switch rooms, satellite mobile communication stations, large medical equipment rooms, laboratories, test rooms, and precision electronic instrument production workshops. In these precision environments, due to the different equipment in the computer room, the temperature standards required for each computer room are also different. For example, the room temperature of some computer rooms needs to be controlled at around 22 degrees Celsius in summer and around 20 degrees Celsius in winter; the room temperature of some computer rooms needs to be controlled at 15 to 30 degrees Celsius in all seasons; and the room temperature of some computer rooms needs to be controlled at 10 to 35 degrees Celsius. Summary of the invention

[0004] The embodiment of the present application provides a computer room air conditioning control method, device, computer storage medium and electrical equipment. When the compressor is stopped and the difference between the oil tank temperature of the compressor and the ambient temperature is small, the electric three-way valve configured on the exhaust side of the compressor is controlled to be in a conducting state, so that the compressor can run at a preset speed in the local loop to achieve the preheating effect, that is, the cavity and oil tank of the compressor are always controlled within a certain temperature range, which can effectively prevent the refrigerant leaking from the electronic expansion valve to the evaporator from migrating to the compressor, and avoid various compressor problems caused by the refrigerant inside the compressor. The technical solution is as follows:

[0005] In a first aspect, an embodiment of the present application provides a computer room air conditioner control method, which is applied to a computer room air conditioner, wherein 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 provided with an electric three-way valve, the exhaust pipe of the compressor 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 return air pipe of the compressor, the third port of the electric three-way valve is connected to the inlet of the condenser, the condenser is connected to the evaporator through the electronic expansion valve, and the outlet of the evaporator is connected to the return air pipe of the compressor, the method includes:

[0006] When it is detected that the compressor is in a shutdown state, obtaining the oil tank temperature of the compressor and obtaining a reference temperature;

[0007] When the difference between the oil tank 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 connected to the second port of the electric three-way valve;

[0008] The compressor is controlled to be preheated at a first preset speed based on the conduction state of the first port and the second port.

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

[0010] When it is detected that the compressor is in a shutdown state, obtaining the oil tank temperature of the compressor and obtaining a reference temperature;

[0011] When the difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold, controlling the second port of the electric three-way valve to be connected to the third port of the electric three-way valve;

[0012] The compressor is controlled to be preheated at a first preset speed based on the conduction state of the second port and the third port.

[0013] In a third aspect, an embodiment of the present application provides a computer room air conditioning control device, which is applied to a computer room air conditioning device, wherein the computer room air conditioning device comprises a compressor, an oil separator, a condenser, an electronic expansion valve and an evaporator, an electric three-way valve is configured on the exhaust side of the compressor, the exhaust pipe of the compressor 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 return air pipe of the compressor, the third port of the electric three-way valve is connected to the inlet of the condenser, the condenser is connected to the evaporator through the electronic expansion valve, and the outlet of the evaporator is connected to the return air pipe of the compressor, and the device comprises:

[0014] A temperature acquisition module, used for acquiring the oil tank temperature of the compressor and 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 to be connected to the second port of the electric three-way valve when the difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold;

[0016] The second control module is used to control the compressor to preheat at a first preset speed based on the conduction state of the first port and the second port.

[0017] In a fourth aspect, an embodiment of the present application provides a computer room air conditioning control device, which is applied to a computer room air conditioner, characterized in that the computer room air conditioner includes a compressor, an oil separator, a condenser, an electronic expansion valve, an evaporator and a controller, an exhaust side of the compressor is provided with an electric three-way valve, the exhaust pipe of the compressor 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 return air pipe of the compressor, the third port of the electric three-way valve is connected to the inlet of the condenser, the condenser is connected to the evaporator through the electronic expansion valve, the outlet of the evaporator is connected to the return air pipe of the compressor, the controller is respectively connected to the compressor, the oil separator, the condenser, the electronic expansion valve, and the evaporator, and the controller is used to:

[0018] When it is detected that the compressor is in a shutdown state, obtaining the oil tank temperature of the compressor and obtaining a reference temperature;

[0019] When the difference between the oil tank 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 connected to the second port of the electric three-way valve;

[0020] The compressor is controlled to be preheated at a first preset speed based on the conduction state of the first port and the second port.

[0021] In a fifth aspect, an embodiment of the present application provides a computer room air conditioning control device, which is applied to a computer room air conditioning, wherein the computer room air conditioning comprises a compressor, an oil separator, an exhaust check valve, a condenser, an electronic expansion valve and an evaporator, an electric three-way valve is configured on the return air side of the compressor, the exhaust pipe of the compressor is connected to the inlet of the oil separator, the oil separator is connected to the condenser through the exhaust check valve, the condenser is connected to the evaporator through the electronic expansion valve, the outlet of the evaporator is connected to the first port of the electric three-way valve, the second port of the electric three-way valve is connected to the outlet of the exhaust check valve, and the third port of the electric three-way valve is connected to the return air pipe of the compressor, and the device comprises:

[0022] A temperature acquisition module, used for acquiring the oil tank temperature of the compressor and 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 to be connected to the third port of the electric three-way valve when the difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold;

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

[0025] In a sixth aspect, an embodiment of the present application provides a computer room air conditioning control device, which is applied to a computer room air conditioning, wherein the computer room air conditioning comprises a compressor, an oil separator, an exhaust check valve, a condenser, an electronic expansion valve, an evaporator and a controller, an electric three-way valve is arranged on the return air side of the compressor, the exhaust pipe of the compressor is connected to the inlet of the oil separator, the oil separator is connected to the condenser through the exhaust check valve, the condenser is connected to the evaporator through the electronic expansion valve, the outlet of the evaporator is connected to the first port of the electric three-way valve, the second port of the electric three-way valve is connected to the outlet of the exhaust check valve, the third port of the electric three-way valve is connected to the return air pipe of the compressor, the controller is respectively connected to the compressor, the oil separator, the condenser, the electronic expansion valve and the evaporator, and the controller is used to:

[0026] When it is detected that the compressor is in a shutdown state, obtaining the oil tank temperature of the compressor and obtaining a reference temperature;

[0027] When the difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold, controlling the second port of the electric three-way valve to be connected to the third port of the electric three-way valve;

[0028] The compressor is controlled to be preheated at a first preset speed based on the conduction state of the second port and the third port.

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

[0030] In an eighth aspect, an embodiment of the present application provides an electrical device, which may 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 executing the above-mentioned method steps.

[0031] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0032] In an embodiment of the present application, an electric three-way valve is arranged on the exhaust side of the compressor of the computer room air conditioner, 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 return air pipe of the compressor, and the third port of the electric three-way valve is connected to the inlet of the condenser. When it is detected that the compressor is in a stopped state, the oil tank temperature of the compressor is obtained, and the reference temperature is obtained. Then, 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 controlled to be connected to the second port of the electric three-way valve, and then, based on the conduction state of the first port and the second port, the compressor is controlled to preheat at a first preset speed. In the embodiment of the present application, when the compressor is stopped and the difference between the oil tank 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 conducting state, so that the compressor can run at a preset speed in a local loop to achieve the effect of preheating, that is, the cavity and the oil tank of the compressor are always controlled within a certain temperature range, which can effectively prevent the refrigerant leaking from the electronic expansion valve to the evaporator from migrating to the compressor, and avoid various compressor problems caused by the refrigerant inside the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is a flowchart of a computer room air conditioning control method provided in an embodiment of the present application;

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

[0036] Figure 3 It is a flowchart of another computer room air conditioning control method provided in an embodiment of the present application;

[0037] Figure 4 It is a flowchart of another computer room air conditioning control method provided in an embodiment of the present application;

[0038] Figure 5 It is a structural schematic diagram of a computer room air conditioner provided in an embodiment of the present application;

[0039] Figure 6 It is a flowchart of another computer room air conditioning control method provided in an embodiment of the present application;

[0040] Figure 7 It is a structural schematic diagram of a computer room air conditioner provided in an embodiment of the present application;

[0041] Figure 8 It is a structural schematic diagram of a computer room air conditioning control device provided in an embodiment of the present application;

[0042] Fig. 9 It is a structural schematic diagram of a computer room air conditioning control device provided in an embodiment of the present application;

[0043] Fig.10 It is a structural schematic diagram of a computer room air conditioning control device provided in an embodiment of the present application;

[0044] Fig.11 It is a structural schematic diagram of a computer room air conditioning control device provided in an embodiment of the present application;

[0045] Fig.12 It is a structural schematic diagram of an electrical device provided in an embodiment of the present application;

[0046] Fig.13 It is a structural schematic diagram of an electrical device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the purpose, features, and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0048] In the description of the present application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood in specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are an "or" relationship.

[0049] In the related art, computer room air conditioners are widely used in high-precision environments, in which computer room air conditioners operate around the clock. In actual use, computer room air conditioners are usually designed with a main air conditioner and a backup air conditioner, and the main air conditioner and the backup air conditioner are used in rotation. Therefore, the air conditioner may be shut down for a long time.

[0050] When the air conditioner is shut down for a long time, 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 and the computer room air conditioner is cooling all year round, the refrigerant will migrate to the compressor. The refrigerant will migrate to the compressor cavity and mix with the refrigerant oil. At this time, not only will the compressor be damaged by the liquid start, but the compressor will also discharge a large amount of refrigerant oil at start-up, causing the compressor to lack oil and wear. Therefore, in the above situation, the migration of refrigerant to the compressor will cause a variety of compressor problems. So how to prevent the refrigerant from migrating to the compressor to cause a variety of compressor problems is a technical problem that needs to be solved urgently.

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

[0052] In the following method embodiments, for the sake of convenience, only the execution subject of each step is introduced as an electrical device.

[0053] See also Figure 1 , which is a flow chart of a computer room air conditioning control method provided in an embodiment of the present application.

[0054] In the description Figure 1 Before showing the method embodiment, please refer to Figure 2 A structural schematic diagram of a computer room air conditioner is shown. Figure 1 The computer room air conditioning control method shown can be based on Figure 2 The structure diagram of the computer room air conditioner is shown in the figure.

[0055] like Figure 2 As shown, it includes a condenser 240, an electronic expansion valve 250, an evaporator 260, a compressor 210, an oil separator 220, an electric three-way valve 230, and a temperature sensor 241 in the condenser 240, a condensing pressure detection device 242 around the condenser 240, a temperature sensor 261 in the evaporator 260, and a temperature sensor 211 in the compressor 210. 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 air 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 air 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 an embodiment of the present application, the computer 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. While ensuring the flow of the refrigerant, the compressor converts the low-temperature and low-pressure gaseous refrigerant flowing out of the evaporator into a high-temperature and high-pressure gaseous 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 lubricating oil mixed 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 pipe of the compressor. The condenser can condense the high-temperature and high-pressure gaseous refrigerant into a supercooled medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant can enter the electronic expansion valve, and 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 a low-temperature and low-pressure liquid refrigerant, so that its saturation temperature is lower than the temperature of the refrigeration space. The low-temperature, low-pressure liquid refrigerant can enter the evaporator, which can use the low-temperature, low-pressure liquid refrigerant to absorb the heat in the room and evaporate the low-temperature, low-pressure liquid refrigerant into a superheated low-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant can flow back to the compressor, thus forming a refrigeration cycle.

[0057] like Figure 1 As shown, the method of the embodiment of the present application may 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 is in shutdown state, which means that the computer room air conditioner is in standby state and the compressor is also shut down. The computer room air conditioner is in standby state, which means that the air conditioner keeps the machine running normally when it is not working, so that it can be started immediately when needed.

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

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

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

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

[0064] In some embodiments, after obtaining the oil tank temperature and the reference temperature, the difference between the oil tank temperature and the reference temperature can be calculated. The difference and the temperature threshold can be judged, and 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 connected to the second port of the electric three-way valve, that is, the third port of the electric three-way valve is disconnected.

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

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

[0067] It is easy to understand that the first preset rotation speed may refer to a preset number of revolutions of the compressor per unit time.

[0068] In some embodiments, when the first port and the second port of the electric three-way valve are in a conducting state, the compressor can realize partial operation, so 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 the first preset speed, which can increase the temperature in the cavity of the compressor, so that the oil tank of the compressor can be controlled within a certain temperature range, so that the refrigerant that is mutually dissolved in the refrigeration oil can be separated, and then there will be no refrigerant in the compressor, achieving the effect of effectively preventing the refrigerant from migrating to the compressor.

[0069] In an embodiment of the present application, an electric three-way valve is arranged on the exhaust side of the compressor of the computer room air conditioner, 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 return air pipe of the compressor, and the third port of the electric three-way valve is connected to the inlet of the condenser. When it is detected that the compressor is in a stopped state, the oil tank temperature of the compressor is obtained, and the reference temperature is obtained. Then, 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 controlled to be connected to the second port of the electric three-way valve, and then, based on the conduction state of the first port and the second port, the compressor is controlled to preheat at a first preset speed. In the embodiment of the present application, when the compressor is stopped and the difference between the oil tank 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 conducting state, so that the compressor can run at a preset speed in a local loop to achieve the effect of preheating, that is, the cavity and the oil tank of the compressor are always controlled within a certain temperature range, which can effectively prevent the refrigerant leaking from the electronic expansion valve to the evaporator from migrating to the compressor, and avoid various compressor problems caused by the refrigerant inside the compressor.

[0070] See also Figure 3 , which is a flow chart of a computer room air conditioning control method provided in an embodiment of the present application. Figure 3 The computer room air conditioning control method shown can be based on Figure 2 Specifically, Figure 2 The functions of the devices included in the embodiment can be found in the description of the above embodiments and will not be repeated here.

[0071] like Figure 3 As shown, the method of the embodiment of the present application may include the following steps:

[0072] S301, when a stop command is sent to the compressor, the electronic expansion valve is controlled to be in a closed state, and the compressor is controlled to run at a second preset speed.

[0073] It is easy to understand that the shutdown command refers to a command used to control the compressor to stop running.

[0074] The second preset speed can be the preset number of revolutions of the compressor in a unit time. The second preset speed is a relatively low speed.

[0075] During the cooling process, the compressor can be in high-speed operation, low-speed operation, and suspended operation. For example, in the cooling stage when the indoor actual temperature is far from the set temperature, the compressor can be in a high-speed operation process to speed up the cooling; when the air conditioner in the computer room is in the preheating state, the compressor can be in a low-speed operation process, so that it can be cooled more quickly and effectively when there is a subsequent cooling demand; in the cooling stage when the indoor actual distance is equal to the set temperature, the compressor can be in a suspended operation process.

[0076] Specifically, when the controller of the computer room air conditioner detects that the compressor can be shut down, a shutdown command can be sent to the compressor, so that the compressor can perform corresponding operations according to the shutdown command. When sending a shutdown command 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 speed. After receiving the shutdown command, the compressor can operate at the second preset 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 flow back to the evaporator directly, let alone the exhaust pipe of the compressor. If the compressor runs at the second preset speed, it can reduce or even evacuate the refrigerant that migrates from the evaporator to the compressor, thereby realizing the function of evacuating the refrigerant in the evaporator. As a result, there is no refrigerant in the evaporator, so there will be no subsequent migration of refrigerant to the compressor.

[0077] S302, when the evaporation pressure of the evaporator is within a preset pressure range, the compressor is controlled to be in a shutdown state, and the first port of the electric three-way valve is controlled to be connected to the second port of the electric three-way valve.

[0078] In some embodiments, when the compressor is running at a second preset speed, the second preset speed is a lower speed, and the refrigerant migrating from the evaporator to the compressor can be gradually reduced until the evaporation pressure of the evaporator is in a preset pressure range, and the compressor is controlled to be in a shutdown state, that is, the compressor is controlled to stop rotating, and the first port and the second port of the electric three-way valve can be controlled to be connected. In this way, if the first port and the second port of the electric three-way valve are connected, it is convenient to control the compressor to perform partial operation later when necessary.

[0079] S303, when it is detected that the compressor is in a shutdown state, obtaining the oil tank temperature of the compressor.

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

[0081] S304, obtaining the outdoor ambient temperature, and determining the outdoor ambient temperature as a reference temperature.

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

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

[0084] In some embodiments, when the oil sump temperature of the compressor is obtained, the middle temperature of the evaporator may be monitored by a temperature sensor installed at the evaporator, and then the middle temperature may be determined as a reference temperature.

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

[0086] In some embodiments, after obtaining the oil tank temperature and the reference temperature, the difference between the oil tank temperature and the reference temperature can be calculated. 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 can be controlled to be connected to the second port of the electric three-way valve.

[0087] S307: Control the compressor to preheat at a first preset speed based on the conduction state of the first port and the second port.

[0088] In some embodiments, when the first port and the second port of the electric three-way valve are in a conducting state, the compressor can realize partial operation, so 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 the first preset speed, which can increase the temperature in the cavity of the compressor, so that the oil tank temperature of the compressor can be controlled within a certain temperature range, so that the refrigerant that is mutually dissolved in the refrigeration oil can be separated, and then there will be no refrigerant in the compressor, so as to effectively prevent the refrigerant from migrating to the compressor.

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

[0090] It is easy to understand that the compressor is in an operating state, which may refer to a state in which the compressor is running at a higher speed to achieve refrigeration.

[0091] In some embodiments, when it is detected that the compressor is in operation, the first port of the electric three-way valve can be controlled to be connected to the third port of the electric three-way valve, so that the refrigerant compressed by the compressor enters the condenser for cooling, and then is reduced in pressure through the expansion valve. The reduced-pressure refrigerant enters the evaporator, and the evaporator uses the refrigerant to absorb indoor heat to achieve a cooling effect. Finally, the refrigerant processed by the evaporator will enter the compressor again, and the above-mentioned processing process will be circulated to achieve a continuous cooling effect.

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

[0093] S310: When the condensing pressure is less than or equal to the pressure threshold, the compressor is controlled to operate at a third preset speed.

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

[0095] S309-S311 are explained below.

[0096] In some embodiments, in a low-temperature outdoor scenario, the condensing pressure of the condenser can be detected in real time, and the condensing pressure and the pressure threshold can be monitored in real time. When the condensing pressure is monitored to be less than or equal to the pressure threshold, the compressor can be controlled to operate at a third preset speed so that the condensing pressure reaches the pressure threshold. At this time, the computer room air conditioner enters the 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 connected. In this state, when it is monitored that the condensing pressure is greater than the pressure threshold, the computer 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. In this way, it can be ensured that the condensing pressure is greater than the pressure threshold, so that when the computer room air conditioner needs to be refrigerated, the compressor can quickly establish a high and low pressure difference and start normally, so as to achieve the effect of rapid start-up for refrigeration.

[0097] In some embodiments, in a low-temperature outdoor scenario, when the condensing pressure is detected to be greater than a pressure threshold, the compressor can be controlled to be in a shutdown state, and the computer room air conditioner does not need to enter a preheating mode. In this case, the condensing pressure is greater than the pressure threshold, and the compressor can quickly establish a high and low pressure difference and start normally, which will not affect the rapid startup of the compressor to achieve cooling.

[0098] In the embodiment of the present application, an electric three-way valve is configured on the exhaust side of the compressor, so that when the compressor is detected to be in a shutdown state or a running state, the electric three-way valve can be flexibly controlled to be in different conduction states. On the one hand, when the difference between the detected 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 connected, and the compressor can be controlled to preheat according to the first preset speed, so that the compressor can be operated in the local loop, so that the compressor oil tank temperature can be controlled within a certain temperature range, so that the refrigerant that is mutually dissolved in the refrigeration oil can be separated, then there will be no refrigerant in the compressor, so as to effectively prevent the refrigerant from migrating to the compressor and avoid various compressor problems caused by the refrigerant inside the compressor. On the other hand, when the first port and the third port of the electric three-way valve are connected, the compressor can be controlled to run at a high speed to achieve a refrigeration effect. In addition, when the condensing pressure of the outdoor unit is detected to be too low, the machine room air conditioner can enter the preheating mode, and the compressor can be controlled to run at a certain speed so that the condensing pressure reaches the pressure threshold, so that when there is a refrigeration demand, the compressor can quickly establish a high and low pressure difference and start normally, so as to achieve a quick start to refrigerate.

[0099] See also Figure 4 , which is a flow chart of a computer room air conditioning control method provided in an embodiment of the present application.

[0100] In the description Figure 4 Before showing the method embodiment, please refer to Figure 5 A structural schematic diagram of a computer room air conditioner is shown. Figure 4 The computer room air conditioning control method shown can be based on Figure 5 The structure diagram of the computer room air conditioner is shown in the figure.

[0101] like Figure 5 As shown, 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 check valve 530, and 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 placed 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 through the oil separator and the exhaust check valve in sequence.

[0102] In an embodiment of the present application, the computer 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. While ensuring the flow of the refrigerant, the compressor converts the low-temperature and low-pressure gaseous refrigerant flowing out of the evaporator into a high-temperature and high-pressure gaseous 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 lubricating oil mixed 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 check valve. The condenser can condense the high-temperature and high-pressure gaseous refrigerant into a 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 a low-temperature and low-pressure liquid refrigerant, so that its saturation temperature is lower than the temperature of the refrigeration space. The low-temperature, low-pressure liquid refrigerant can enter the evaporator, which can use the low-temperature, low-pressure liquid refrigerant to absorb the heat in the room and evaporate the low-temperature, low-pressure liquid refrigerant into a superheated low-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant can flow back to the compressor, thus forming a refrigeration cycle.

[0103] like Figure 4 As shown, the method of the embodiment of the present application may 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 shutdown state, which means that the computer room air conditioner is in standby state and the compressor is also shut down. The computer room air conditioner is in standby state, which means that the air conditioner keeps the machine running normally when it is not working, so that it can be started immediately when needed.

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

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

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

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

[0110] In some embodiments, after obtaining the oil tank temperature and the reference temperature, the difference between the oil tank temperature and the reference temperature can be calculated. The difference and the temperature threshold can be judged, 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 connected to the third port of the electric three-way valve, that is, the first port of the electric three-way valve is disconnected.

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

[0112] S403, controlling the compressor to preheat at a first preset speed based on the conduction state of the second port and the third port.

[0113] It is easy to understand that the first preset rotation speed may refer to a preset number of revolutions of the compressor per unit time.

[0114] In some embodiments, when the second port and the third port of the electric three-way valve are in a conducting state, the compressor can realize partial operation, so 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 the first preset speed, which can increase the temperature in the cavity of the compressor, so that the oil tank of the compressor can be controlled within a certain temperature range, so that the refrigerant that is mutually dissolved in the refrigeration oil can be separated, and then there will be no refrigerant in the compressor, achieving the effect of effectively preventing the refrigerant from migrating to the compressor.

[0115] In an embodiment of the present application, an electric three-way valve is configured on the return air side of the compressor of the computer room air conditioner, the first port of the electric three-way valve is connected to the outlet of the evaporator, the second port of the electric three-way valve is connected to the inlet of the condenser, and the third port of the electric three-way valve is connected to the return air pipe of the compressor. When it is detected that the compressor is in a stopped state, the oil tank temperature of the compressor is obtained, and the reference temperature is obtained. Then, when the difference between the oil tank 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 connected to the third port of the electric three-way valve, and then, based on the conduction state of the second port and the third port, the compressor is controlled to preheat at a first preset speed. In the embodiment of the present application, when the compressor is stopped and the difference between the oil tank temperature of the compressor and the ambient temperature is small, the electric three-way valve configured on the return air side of the compressor is controlled to be in a conducting state, so that the compressor can run at a preset speed in a local loop to achieve the effect of preheating, that is, the cavity and the oil tank 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 inside the compressor.

[0116] See also Figure 6 , which is a flow chart of a computer room air conditioning control method provided in an embodiment of the present application.

[0117] In the description Figure 6 Before showing the method embodiment, please refer to Figure 7 A structural schematic diagram of a computer room air conditioner is shown. Figure 6 The computer room air conditioning control method shown can be based on Figure 7 The structure diagram of the computer room air conditioner is shown in the figure.

[0118] like Figure 7 As shown, it includes a condenser 740, a liquid reservoir 750, a fluorine pump 760, a bypass check 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 light fragrance valve 730, and 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 to the inlet of the evaporator through the liquid reservoir, the fluorine pump, and the electronic expansion valve in sequence. The electric three-way valve is placed 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 through the oil separator and the exhaust check valve in sequence.

[0119] In the embodiment of the present application, the computer room air conditioner can be used for cooling. Figure 7 The structure shown can have three working modes, including compressor mode, fluorine pump mode and mixed mode.

[0120] In the compressor mode, the compressor operates normally and the fluorine pump stops running. Specifically, this mode can be used in scenarios where the outdoor ambient 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. While ensuring the flow of the refrigerant, the compressor converts the low-temperature and low-pressure gaseous refrigerant flowing out of the evaporator into a high-temperature and high-pressure gaseous 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 lubricating oil mixed 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 check valve. The condenser can condense the high-temperature and high-pressure gaseous refrigerant into a 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 a low-temperature and low-pressure liquid refrigerant, so that its saturation temperature is lower than the temperature of the refrigerated space. The low-temperature, low-pressure liquid refrigerant can enter the evaporator, which can use the low-temperature, low-pressure liquid refrigerant to absorb the heat in the room and evaporate the low-temperature, low-pressure liquid refrigerant into a superheated low-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant can flow back to the compressor, thus forming a refrigeration cycle.

[0121] In the fluorine pump mode, the fluorine pump runs and the compressor stops running. Specifically, this mode can be used in scenarios where the outdoor ambient temperature is high and reaches the set temperature of the computer room air conditioner. In this mode, the refrigerant after the evaporator has exchanged heat with the indoor air can directly enter the condenser to exchange heat with the outdoor cold source. The refrigerant cooled into liquid by the condenser overcomes the pipe resistance under the action of the fluorine pump and returns to the evaporator to continue heat exchange, achieving the effect of cooling and energy saving.

[0122] In the mixed mode, the compressor runs and the fluorine pump also runs. Specifically, this mode can be used in scenarios where the outdoor ambient temperature is lower than the set temperature. In this mode, the compressor runs at a variable frequency and the compressor speed is slow, which can achieve energy saving.

[0123] like Figure 6 As shown, the method of the embodiment of the present application may include the following steps:

[0124] S601, when a stop command is sent to the compressor, the electronic expansion valve is controlled to be in a closed state, and the compressor is controlled to run at a second preset speed.

[0125] It is easy to understand that the shutdown command refers to a command used to control the compressor to stop running.

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

[0127] During the cooling process, the compressor can be in high-speed operation, low-speed operation, and suspended operation. For example, in the cooling stage when the indoor actual temperature is far from the set temperature, the compressor can be in a high-speed operation process to speed up the cooling; when the air conditioner in the computer room is in the preheating state, the compressor can be in a low-speed operation process, so that it can be cooled more quickly and effectively when there is a subsequent cooling demand; in the cooling stage when the indoor actual distance is equal to the set temperature, the compressor can be in a suspended operation process.

[0128] Specifically, when the controller of the computer room air conditioner detects that the compressor can be shut down, a shutdown command can be sent to the compressor, so that the compressor can perform corresponding operations according to the shutdown command. When sending a shutdown command 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 speed. After receiving the shutdown command, the compressor can operate at the second preset 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 flow back to the evaporator directly, let alone the exhaust pipe of the compressor. If the compressor runs at the second preset speed, it can reduce or even evacuate the refrigerant that migrates from the evaporator to the compressor, thereby realizing the function of evacuating the refrigerant in the evaporator. As a result, there is no refrigerant in the evaporator, so there will be no subsequent migration of refrigerant to the compressor.

[0129] S602, when the evaporation pressure of the evaporator is within a preset pressure range, the compressor is controlled to be in a shutdown state, and the first port of the electric three-way valve is controlled to be connected to the second port of the electric three-way valve.

[0130] In some embodiments, during the operation of the compressor at a second preset speed, the second preset speed is a lower speed, which can gradually reduce the refrigerant migrating from the evaporator to the compressor until the evaporation pressure of the evaporator is in the preset pressure range, and the compressor is controlled to be in a shutdown state, that is, the compressor is controlled to stop rotating, and the first port and the second port of the electric three-way valve can be controlled to be connected. In this way, since the first port and the second port of the electric three-way valve are connected, and the third port used to connect the compressor return pipe and the first port used for the evaporator outlet are in a disconnected state, the refrigerant can be completely cut off from flowing into the compressor, which can not only prevent the refrigerant from entering the compressor from the evaporator, but also the exhaust check valve installed on the exhaust side of the compressor can effectively prevent the refrigerant from entering the compressor from the exhaust side.

[0131] S603, when it is detected that the compressor is in a stopped state and the fluorine pump is not in a running state, the oil tank temperature of the compressor is obtained.

[0132] In some embodiments, when the compressor is in a stopped state and the fluorine pump is not running, the temperature of the lubricating oil in the bottom oil tank of the compressor can be obtained by a temperature sensor installed in the compressor.

[0133] S604, obtaining the outdoor ambient temperature, and determining the outdoor ambient temperature as a reference temperature.

[0134] In some embodiments, in the case of acquiring the oil sump temperature of the compressor, the outdoor ambient temperature may be monitored by a temperature sensor installed at the condenser, and then the outdoor ambient temperature may be determined as a reference temperature.

[0135] S605, obtaining the middle temperature of the evaporator, and determining the middle temperature as a reference temperature.

[0136] In some embodiments, when the oil sump temperature of the compressor is obtained, the middle temperature of the evaporator may be monitored by a temperature sensor installed at the evaporator, and then the middle temperature may be determined as a reference temperature.

[0137] S606, when the difference between the oil tank temperature and the reference temperature is less than or equal to the temperature threshold, control the second port of the electric three-way valve to be connected to the third port of the electric three-way valve.

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

[0139] S607: Control the compressor to preheat at a first preset speed based on the conduction state of the second port and the third port.

[0140] In some embodiments, when the second port and the third port of the electric three-way valve are in a conducting state, the compressor can realize partial operation, so 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 the first preset speed, which can increase the temperature in the cavity of the compressor, so that the oil tank of the compressor can be controlled within a certain temperature range, so that the refrigerant that is mutually dissolved in the refrigeration oil can be separated, 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, control the first port of the electric three-way valve to be connected with the second port of the electric three-way valve.

[0142] In some embodiments, 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 can be controlled to be connected to the second port of the electric three-way valve. In this way, since the first port of the electric three-way valve is connected to the second port, and the third port for connecting the compressor return pipe is disconnected from the first port for the evaporator outlet, the refrigerant can be completely cut off from flowing into the compressor. On the one hand, it can not only prevent the refrigerant from entering the compressor from the evaporator, but also the exhaust check valve installed on the exhaust side of the compressor can effectively prevent the refrigerant from entering the compressor from the exhaust side. Moreover, when the fluorine pump is running and the compressor is stopped, the refrigerant after the evaporator and the indoor air heat exchange can directly enter the condenser and exchange heat with the outdoor cold source. The refrigerant cooled into liquid by the condenser overcomes the pipe resistance under the action of the fluorine pump and returns to the evaporator to continue heat exchange, achieving the effect of refrigeration and energy saving.

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

[0144] It is easy to understand that the compressor is in an operating state, which may refer to a state in which the compressor is running at a higher speed to achieve refrigeration.

[0145] In some embodiments, when it is detected that the compressor is in operation, the first port of the electric three-way valve can be controlled to be connected to the third port of the electric three-way valve, so that the refrigerant compressed by the compressor enters the condenser for cooling, and then is reduced in pressure through the expansion valve. The reduced-pressure refrigerant enters the evaporator, and the evaporator uses the refrigerant to absorb indoor heat to achieve a cooling effect. Finally, the refrigerant processed by the evaporator will enter the compressor again, and the above-mentioned processing process will be circulated to achieve a continuous cooling effect.

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

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

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

[0149] S610 - S612 are explained below.

[0150] In some embodiments, in a low-temperature outdoor scenario, the condensing pressure of the condenser can be detected in real time, and the condensing pressure and the pressure threshold can be monitored in real time. When the condensing pressure is monitored to be less than or equal to the pressure threshold, the compressor can be controlled to run at a third preset speed to achieve refrigeration. At this time, the computer room air conditioner enters the 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 connected. In this state, when it is monitored that the condensing pressure is greater than the pressure threshold, the computer 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. In this way, it can be ensured that the condensing pressure is greater than the pressure threshold, so that when the computer room air conditioner needs to be refrigerated, the compressor can quickly establish a high and low pressure difference and start normally, so as to achieve a quick start refrigeration effect.

[0151] In some embodiments, in a low-temperature outdoor scenario, when the condensing pressure is detected to be greater than a pressure threshold, the compressor can be controlled to be in a shutdown state, and the computer room air conditioner does not need to enter a preheating mode. In this case, the condensing pressure is greater than the pressure threshold, and the compressor can quickly establish a high and low pressure difference and start normally, which will not affect the rapid startup of the compressor to achieve cooling.

[0152] In the embodiment of the present application, an electric three-way valve is configured on the return air side of the compressor, and three modes of compressor mode, fluorine pump mode and mixed mode can be supported 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 their states. On the one hand, when the compressor is in a shutdown state and the fluorine pump is not in a running state, when 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 connected, and the compressor can be controlled to be preheated according to the first preset speed, so that the compressor can be operated in a local loop, so that the compressor oil tank temperature can be controlled within a certain temperature range, so that the refrigerant that is mutually dissolved in the refrigeration oil can be separated, then there will be no refrigerant in the compressor, so as to effectively prevent the refrigerant from migrating to the compressor, and avoid various compressor problems caused by the refrigerant inside the compressor. On the other hand, when the compressor is in a shutdown state and the fluorine pump is in a running state, the first port and the second port of the electric three-way valve can be controlled to be connected, and the operation of the fluorine pump mode can be realized, which can achieve the effect of refrigeration and energy saving. In addition, when the compressor is in operation, the first port and the third port of the electric three-way valve can be controlled to be connected, and the compressor can be controlled to run at a high speed to achieve a cooling effect. Moreover, when the condensing pressure of the outdoor unit is detected to be too low, the air conditioner in the computer room enters the preheating mode, and controls the compressor to run at a certain speed so that the condensing pressure reaches the pressure threshold, so that when there is a cooling demand, the compressor can quickly establish a high and low pressure difference and start normally, achieving a quick start to achieve a cooling effect.

[0153] See also Figure 8 , is a schematic diagram of the structure of a computer room air conditioning control device provided in an embodiment of the present application. The computer room air conditioning control device 800 can be implemented as all or part of the electrical equipment through software, hardware or a combination of both. The computer room air conditioning control device 800 includes:

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

[0155] A first control module 820, configured to control the first port of the electric three-way valve to be connected to the second port of the electric three-way valve when the difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold;

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

[0157] Optionally, the computer room air conditioning control device further includes:

[0158] a third control module, configured to control the electronic expansion valve to be in a closed state and control the compressor to operate at a second preset speed when a stop command is sent to the compressor;

[0159] The fourth control module is used to control the compressor to be in a shutdown state when the evaporation pressure of the evaporator is within a preset pressure range, and to control the first port of the electric three-way valve to be connected with the second port of the electric three-way valve.

[0160] Optionally, the computer room air conditioning control device further includes:

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

[0162] Optionally, the temperature acquisition module is specifically used for:

[0163] Acquire the outdoor ambient temperature, and determine the outdoor ambient temperature as a reference temperature; or,

[0164] The middle temperature of the evaporator is acquired, and the middle temperature is determined as a reference temperature.

[0165] Optionally, the computer room air conditioning control device further includes:

[0166] A pressure detection module, used for obtaining the condensing pressure of the condenser;

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

[0168] The second pressure control module is used to control the compressor to be in a shutdown state when the condensing pressure is greater than the pressure threshold.

[0169] See also Fig. 9 , is a schematic diagram of the structure of a computer room air conditioning control device provided in an embodiment of the present application. Fig. 9 As shown, it 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, and 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. Among them, the controller 900 is electrically connected to the remaining components mentioned above. The physical connection relationship between the remaining components except the controller 900 can be seen in the connection structure in the right rectangle in the figure. Specifically, the exhaust pipe of the compressor 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 return air pipe of the compressor, the third port of the electric three-way valve is connected to the inlet of the condenser, the condenser is connected to the evaporator through the electronic expansion valve, and the outlet of the evaporator is connected to the return air pipe of the compressor.

[0170] The computer room air conditioning control device 900 can be implemented as 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 to:

[0171] When it is detected that the compressor is in a shutdown state, obtaining the oil tank temperature of the compressor and obtaining a reference temperature;

[0172] When the difference between the oil tank 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 connected to the second port of the electric three-way valve;

[0173] The compressor is controlled to be preheated at a first preset speed based on the conduction state of the first port and the second port.

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

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

[0176] When the evaporation pressure of the evaporator is within a preset pressure range, the compressor is controlled to be in a shutdown state, and the first port of the electric three-way valve is controlled to be connected to the second port of the electric three-way valve.

[0177] Optionally, the controller in the computer room air conditioning control device 900 is further used for:

[0178] 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 connected to the third port of the electric three-way valve.

[0179] Optionally, when acquiring the reference temperature, the controller in the computer room air conditioning control device 900 is specifically used to:

[0180] Acquire the outdoor ambient temperature, and determine the outdoor ambient temperature as a reference temperature; or,

[0181] The middle temperature of the evaporator is acquired, and the middle temperature is determined as a reference temperature.

[0182] Optionally, the controller in the computer room air conditioning control device 900 is further used for:

[0183] Obtaining the condensing pressure of the condenser;

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

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

[0186] See also Fig.10 , is a schematic diagram of the structure of a computer room air conditioning control device provided in an embodiment of the present application. The computer room air conditioning control device 1000 can be implemented as all or part of an electrical device through software, hardware, or a combination of both. The computer room air conditioning control device 1000 includes:

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

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

[0189] The first control module 1003 is used to control the compressor to preheat at a first preset speed based on the conduction state between the second port and the third port.

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

[0191] When it is detected that the compressor is in a stopped state and the fluorine pump is not in a running state, the oil tank temperature of the compressor is acquired.

[0192] Optionally, the computer room air conditioning control device further includes:

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

[0194] Optionally, the computer room air conditioning control device further includes:

[0195] a fourth control module, configured to control the electronic expansion valve to be in a closed state and control the compressor to operate at a second preset speed when a stop command is sent to the compressor;

[0196] The fifth control module is used to control the compressor to be in a shutdown state when the evaporation pressure of the evaporator is within a preset pressure range, and to control the first port of the electric three-way valve to be connected with the second port of the electric three-way valve.

[0197] Optionally, the computer room air conditioning control device further includes:

[0198] The sixth control module is used to control the first port of the electric three-way valve to be connected 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 used to:

[0200] Acquire the outdoor ambient temperature, and determine the outdoor ambient temperature as a reference temperature; or,

[0201] The middle temperature of the evaporator is acquired, and the middle temperature is determined as a reference temperature.

[0202] Optionally, the computer room air conditioning control device further includes:

[0203] A pressure detection module, used for obtaining the condensing pressure of the condenser;

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

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

[0206] See also Fig.11 , is a structural schematic diagram of a computer room air conditioning control device provided in an embodiment of the present application.

[0207] like Fig.11 As shown, it includes a controller 1100, a condenser 1140, an electronic expansion valve 1150, an evaporator 1160, an electric three-way valve 1170, a compressor 1110, an oil separator 1120, an exhaust check valve 1130, a temperature sensor 1141 in the condenser 1140, a condensing pressure detection device 1142 around the condenser 1140, a temperature sensor 1161 in the evaporator 1160, and a temperature sensor 1111 in the compressor 1110. Among them, the controller 1100 is electrically connected to the other components mentioned above. For the physical connection relationship between the other components except the controller 1100, please refer to Fig.11 The connection structure in the middle right rectangle. Specifically, the exhaust pipe of the compressor is connected to the inlet of the oil separator, the oil separator is connected to the condenser through the exhaust check valve, the condenser is connected to the evaporator through the electronic expansion valve, the outlet of the evaporator is connected to the first port of the electric three-way valve, the second port of the electric three-way valve is connected to the outlet of the exhaust check valve, and the third port of the electric three-way valve is connected to the return air pipe of the compressor.

[0208] The computer room air conditioning control device 1100 can be implemented as 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 1100 is used to:

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

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

[0211] The compressor is controlled to be preheated at a first preset speed based on the conduction state of the second port and the third port.

[0212] Optionally, the controller in the computer room air conditioning control device 1100 is specifically used for:

[0213] When it is detected that the compressor is in a stopped state and the fluorine pump is not in a running state, the oil tank temperature of the compressor is acquired.

[0214] Optionally, the controller in the computer room air conditioning control device 1100 is further used for:

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

[0216] Optionally, the controller in the computer room air conditioning control device 1100 is further used for:

[0217] When a stop command is sent to the compressor, the electronic expansion valve is controlled to be in a closed state, and the compressor is controlled to run at a second preset speed;

[0218] When the evaporation pressure of the evaporator is within a preset pressure range, the compressor is controlled to be in a shutdown state, and the first port of the electric three-way valve is controlled to be connected to the second port of the electric three-way valve.

[0219] Optionally, the controller in the computer room air conditioning control device 1100 is further used for:

[0220] 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 connected to the third port of the electric three-way valve.

[0221] Optionally, when acquiring the reference temperature, the controller in the computer room air conditioning control device 1100 is specifically used to:

[0222] Acquire the outdoor ambient temperature, and determine the outdoor ambient temperature as a reference temperature; or,

[0223] The middle temperature of the evaporator is acquired, and the middle temperature is determined as a reference temperature.

[0224] Optionally, the controller in the computer room air conditioning control device 1100 is further used for:

[0225] Obtaining the condensing pressure of the condenser;

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

[0227] When the condensing pressure is greater than the pressure threshold, the compressor is controlled to be in a shutdown state.

[0228] Please refer to Fig.12 , Fig.12 The schematic diagram of the structure of an electrical device provided in the embodiment of the present application. In the embodiment of the present application, the electrical device may be a computer room air conditioner. Fig.12 As shown, the electrical device 1200 may 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 used to realize the connection and communication between these components.

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

[0231] The network interface 1204 may optionally include a standard wired interface or a wireless interface (such as a WI-FI interface).

[0232] Among them, the processor 1201 may include one or more processing cores. The processor 1201 uses various interfaces and lines to connect various parts of the entire electrical device 1200, and various functions and processing data of the electrical device 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 hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor 1201 can integrate one or more combinations of a central processing unit (Central Processing Unit, CPU) and a modem. Among them, the CPU mainly processes the operating system, display screen, etc.; the modem is used to process wireless communication. It can be understood that the above-mentioned modem may not be integrated into the processor 1201, and it can be implemented separately through a chip.

[0233] Among them, the memory 1205 may include a random access memory (Random Access Memory, RAM) and may also include a read-only memory (Read-Only Memory). 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 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 a touch function, a sound playback function, etc.), instructions for implementing the above-mentioned method embodiments, etc.; the data storage area may store data involved in the above-mentioned method embodiments, etc. The memory 1205 may optionally be at least one storage device located away from the aforementioned processor 1201. As Figure 2 As shown, the memory 1205 as a computer storage medium may include an operating system, a network communication module, a user interface module, and a program of a computer room air conditioning control method.

[0234] exist Fig.12 In the electrical device 1200 shown, the user interface 1203 is mainly used to provide an input interface for the user and obtain the data input by the user; and the processor 1201 can be used to call the program of the computer room air conditioning control method stored in the memory 1205, and specifically perform the following operations:

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

[0236] When the difference between the oil tank 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 connected to the second port of the electric three-way valve;

[0237] The compressor is controlled to be preheated at a first preset speed based on the conduction state of the first port and the second port.

[0238] In one embodiment, before executing the step of acquiring the oil tank temperature of the compressor when detecting that the compressor is in the shutdown state, the processor 1201 further performs the following operations:

[0239] When a stop command is sent to the compressor, the electronic expansion valve is controlled to be in a closed state, and the compressor is controlled to run at a second preset speed;

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

[0241] In one embodiment, the processor 1201 further performs the following operations:

[0242] 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 connected to the third port of the electric three-way valve.

[0243] In one embodiment, when the processor 1201 executes the acquisition of the reference temperature, the processor 1201 specifically performs the following operations:

[0244] Acquire the outdoor ambient temperature, and determine the outdoor ambient temperature as a reference temperature; or,

[0245] The middle temperature of the evaporator is acquired, and the middle temperature is determined as a reference temperature.

[0246] In one embodiment, the processor 1201 further performs the following operations:

[0247] Obtaining the condensing pressure of the condenser;

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

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

[0250] In addition, those skilled in the art can understand that the structure of the electrical device 1200 shown in the above drawings does not constitute a limitation on the electrical device 1200, and the electrical device may include more or fewer components than shown in the drawings, or combine certain components, or arrange the components differently. For example, the electrical device 1200 also includes components such as a radio frequency circuit, an audio circuit, a WiFi component, a power supply, and a Bluetooth component, which will not be described in detail here.

[0251] Please refer to Fig.13 , Fig.13 The schematic diagram of the structure of an electrical device provided in the embodiment of the present application. In the embodiment of the present application, the electrical device may be a computer room air conditioner. Fig.13 As shown, the electrical device 1300 may 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 these components.

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

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

[0255] Among them, the processor 1301 may include one or more processing cores. The processor 501 uses various interfaces and lines to connect various parts of the entire electrical device 1300, and various functions and processing data of the electrical device 1300 by running or executing instructions, programs, code sets or instruction sets stored in the memory 1305, and calling data stored in the memory 1305. Optionally, the processor 1301 can be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor 1301 can integrate one or more combinations of a central processing unit (Central Processing Unit, CPU) and a modem. Among them, the CPU mainly processes the operating system, display screen, etc.; the modem is used to process wireless communication. It can be understood that the above-mentioned modem may not be integrated into the processor 1301, and it can be implemented separately through a chip.

[0256] Among them, the memory 1305 may include a random access memory (Random Access Memory, RAM) and may also include a read-only memory (Read-Only Memory). Optionally, the memory 1305 includes a non-transitory computer-readable storage medium. The memory 1305 can be used to store instructions, programs, codes, 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 a touch function, a sound playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc.; the data storage area may store data involved in the above-mentioned various method embodiments, etc. The memory 1305 may also be optionally at least one storage device located away from the aforementioned processor 501. As Fig.13 As shown, the memory 1305 as a computer storage medium may include an operating system, a network communication module, a user interface module, and a program of a computer room air conditioning control method.

[0257] exist Fig.13 In the electrical device 1300 shown, the user interface 1303 is mainly used to provide an input interface for the user and obtain the data input by the user; and 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] When it is detected that the compressor is in a shutdown state, obtaining the oil tank temperature of the compressor and obtaining a reference temperature;

[0259] When the difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold, controlling the second port of the electric three-way valve to be connected to the third port of the electric three-way valve;

[0260] The compressor is controlled to be preheated at a first preset speed based on the conduction state of the second port and the third port.

[0261] In one embodiment, the computer room air conditioner further includes a liquid reservoir, a fluorine pump and a bypass one-way valve, the condenser is connected to the electronic expansion valve through the liquid reservoir and the fluorine pump in sequence, the bypass one-way valve is connected in parallel with the fluorine pump, and the processor 1301, when executing the operation of obtaining the oil tank temperature of the compressor when detecting that the compressor is in a shutdown state, specifically performs the following operations:

[0262] When it is detected that the compressor is in a stopped state and the fluorine pump is not in a running state, the oil tank temperature of the compressor is acquired.

[0263] In one embodiment, the processor 1301 further performs the following operations:

[0264] When it is detected that the compressor is in a stopped state and the fluorine pump is in a running state, the first port of the electric three-way valve is controlled to be connected to the second port of the electric three-way valve.

[0265] In one embodiment, before executing the step of acquiring the oil tank temperature of the compressor when detecting that the compressor is in the shutdown state, the processor 1301 further performs the following operations:

[0266] When a stop command is sent to the compressor, the electronic expansion valve is controlled to be in a closed state, and the compressor is controlled to run at a second preset speed;

[0267] When the evaporation pressure of the evaporator is within a preset pressure range, the compressor is controlled to be in a shutdown state, and the first port of the electric three-way valve is controlled to be connected to the second port of the electric three-way valve.

[0268] In one embodiment, the processor 1301 further performs the following operations:

[0269] 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 connected to the third port of the electric three-way valve.

[0270] In one embodiment, when the processor 1301 executes the acquisition of the reference temperature, the processor 1301 specifically performs the following operations:

[0271] Acquire the outdoor ambient temperature, and determine the outdoor ambient temperature as a reference temperature; or,

[0272] The middle temperature of the evaporator is acquired, and the middle temperature is determined as a reference temperature.

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

[0274] Obtaining the condensing pressure of the condenser;

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

[0276] When the condensing pressure is greater than the pressure threshold, the compressor is controlled to be in a shutdown state.

[0277] In addition, those skilled in the art can understand that the structure of the electrical device 1300 shown in the above drawings does not constitute a limitation on the electrical device 1300, and the electrical device may include more or fewer components than shown in the drawings, or combine certain components, or arrange the components differently. For example, the electrical device 1300 also includes components such as a radio frequency circuit, an audio circuit, a WiFi component, a power supply, and a Bluetooth component, which will not be described in detail here.

[0278] An embodiment of the present application further provides 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 conditioning control method as described in the above embodiments.

[0279] An embodiment of the present application further provides 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 conditioning control method described in the above embodiments.

[0280] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented with hardware, software, firmware, or any combination thereof. When implemented using 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. Computer-readable media include computer storage media and communication media, wherein the communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that a general or special-purpose computer can access.

[0281] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A computer room air conditioner control method, applied to a computer room air conditioner, characterized in that: The computer 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, the exhaust pipe of the compressor 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 return air pipe of the compressor, the third port of the electric three-way valve is connected to the inlet of the condenser, the condenser is connected to the evaporator through the electronic expansion valve, the outlet of the evaporator is connected to the return air pipe of the compressor, and the method comprises: When it is detected that the compressor is in a shutdown state, obtaining the oil tank temperature of the compressor and obtaining a reference temperature; When the difference between the oil tank 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 connected to the second port of the electric three-way valve; The compressor is controlled to be preheated at a first preset speed based on the conduction state of the first port and the second port.

2. The method according to claim 1, characterized in that: When it is detected that the compressor is in a shutdown state, before obtaining the oil tank temperature of the compressor, the method further includes: When a stop command is sent to the compressor, the electronic expansion valve is controlled to be in a closed state, and the compressor is controlled to run at a second preset speed; When the evaporation pressure of the evaporator is within a preset pressure range, the compressor is controlled to be in a shutdown state, and the first port of the electric three-way valve is controlled to be connected to the second port of the electric three-way valve.

3. The method according to claim 1, characterized in that: 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 is controlled to be connected to the third port of the electric three-way valve.

4. The method according to claim 1, characterized in that The obtaining of the reference temperature comprises: Acquire the outdoor ambient temperature, and determine the outdoor ambient temperature as a reference temperature; or, The middle temperature of the evaporator is acquired, and the middle temperature is determined as a reference temperature.

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

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

7. The method according to claim 6, characterized in that The machine room air conditioner further comprises a liquid reservoir, a fluorine pump and a bypass check valve, the condenser is connected to the electronic expansion valve via the liquid reservoir and the fluorine pump in sequence, and the bypass check valve is connected in parallel to the fluorine pump; When it is detected that the compressor is in a shutdown state, obtaining the oil tank temperature of the compressor includes: When it is detected that the compressor is in a stopped state and the fluorine pump is not in a running state, the oil tank temperature of the compressor is acquired.

8. The method according to claim 7, characterized in that The method further comprises: When it is detected that the compressor is in a stopped state and the fluorine pump is in a running state, the first port of the electric three-way valve is controlled to be connected to the second port of the electric three-way valve.

9. The method according to claim 6 or 7, characterized in that: When it is detected that the compressor is in a shutdown state, before obtaining the oil tank temperature of the compressor, the method further includes: When a stop command is sent to the compressor, the electronic expansion valve is controlled to be in a closed state, and the compressor is controlled to run at a second preset speed; When the evaporation pressure of the evaporator is within a preset pressure range, the compressor is controlled to be in a shutdown state, and the first port of the electric three-way valve is controlled to be connected to the second port of the electric three-way valve.

10. The method according to claim 6 or 7, characterized in that: 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 is controlled to be connected to the third port of the electric three-way valve.

11. The method according to claim 6 or 7, characterized in that: The obtaining of the reference temperature comprises: Acquire the outdoor ambient temperature, and determine the outdoor ambient temperature as a reference temperature; or, The middle temperature of the evaporator is acquired, and the middle temperature is determined as a reference temperature.

12. The method according to claim 6 or 7, characterized in that: The method further comprises: Obtaining the condensing pressure of the condenser; When the condensing pressure is less than or equal to the pressure threshold, controlling the compressor to operate at a third preset speed; When the condensing pressure is greater than the pressure threshold, the compressor is controlled to be in a shutdown state.

13. A computer room air conditioner control device, applied to a computer room air conditioner, characterized in that: The computer 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, the exhaust pipe of the compressor 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 return air pipe of the compressor, the third port of the electric three-way valve is connected to the inlet of the condenser, the condenser is connected to the evaporator through the electronic expansion valve, the outlet of the evaporator is connected to the return air pipe of the compressor, and the device comprises: A temperature acquisition module, used for acquiring the oil tank temperature of the compressor and a reference temperature when it is detected that the compressor is in a shutdown state; a first control module, configured to control the first port of the electric three-way valve to be connected to the second port of the electric three-way valve when the difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold; The second control module is used to control the compressor to preheat at a first preset speed based on the conduction state of the first port and the second port.

14. A computer room air conditioner control device, applied to a computer room air conditioner, characterized in that: The computer 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 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 return air pipe of the compressor. The third port of the electric three-way valve is connected to the inlet of the condenser. The condenser is connected to the evaporator through the electronic expansion valve. The outlet of the evaporator is connected to the return air pipe of the compressor. The controller is respectively connected to the compressor, the oil separator, the condenser, the electronic expansion valve and the evaporator. The controller is used for: When it is detected that the compressor is in a shutdown state, obtaining the oil tank temperature of the compressor and obtaining a reference temperature; When the difference between the oil tank 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 connected to the second port of the electric three-way valve; The compressor is controlled to be preheated at a first preset speed based on the conduction state of the first port and the second port.

15. A computer room air conditioner control device, applied to a computer room air conditioner, characterized in that: The computer room air conditioner comprises a compressor, an oil separator, an exhaust check valve, a condenser, an electronic expansion valve and an evaporator. The return air side of the compressor is provided with an electric three-way valve. The exhaust pipe of the compressor is connected to the inlet of the oil separator. The oil separator is connected to the condenser through the exhaust check valve. The condenser is connected to the evaporator through the electronic expansion valve. The outlet of the evaporator is connected to the first port of the electric three-way valve. The second port of the electric three-way valve is connected to the outlet of the exhaust check valve. The third port of the electric three-way valve is connected to the return air pipe of the compressor. The device comprises: A temperature acquisition module, used for acquiring the oil tank temperature of the compressor and a reference temperature when it is detected that the compressor is in a shutdown state; a first control module, configured to control the second port of the electric three-way valve to be connected to the third port of the electric three-way valve when the difference between the oil tank temperature and the reference temperature is less than or equal to a temperature threshold; The first control module is used to control the compressor to preheat at a first preset speed based on the conduction state of the second port and the third port.

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

17. A computer storage medium, characterized in that: The computer storage medium stores a plurality of instructions, which are suitable for being loaded by a processor and executing the method steps of any one of claims 1 to 5 or 6 to 12.

18. An electrical device, characterized in that: include: A processor and a memory; wherein the memory stores a computer program, and the computer program is suitable for being loaded by the processor and executing the method steps as claimed in any one of claims 1 to 5 or 6 to 12.

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