Refrigeration system, control method and electrical equipment

Abstract

The present application provides a refrigeration system, a control method and an electrical device, and relates to the field of refrigeration technology. The refrigeration system includes some or all of the necessary components of the existing refrigeration system, and a temperature sensor is also arranged at the outlet of the evaporator to monitor the superheat of the refrigerant discharged from the outlet of the evaporator. If the superheat detected by the temperature sensor is not greater than the set threshold value, it indicates that the refrigerant is always in a two-phase state when flowing through the evaporator. Since the temperature of the two-phase refrigerant remains basically unchanged or changes very little after absorbing heat, it is ensured that the temperature of each part inside the evaporator is basically the same. If the superheat detected by the temperature sensor is greater than the set threshold value, it indicates that the refrigerant is converted from a two-phase state to a gaseous state after flowing through the evaporator. The control unit can reduce the superheat of the refrigerant in the circulation loop by increasing the speed of the air pump in the compressor and increasing the opening of the switch valve, so that the refrigerant is always in a two-phase state after flowing through the evaporator, ensuring that the temperature of each part inside the evaporator is basically the same.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to a refrigeration system, a control method and an electrical device. Background Art

[0002] Existing data centers, electric vehicles, etc. are all equipped with refrigeration systems. The refrigeration system includes a heat exchanger, which can exchange heat with the surrounding gas through the liquid or gas circulating inside it, thereby reducing or increasing the temperature of the surrounding gas.

[0003] Take the microchannel heat exchanger as an example. It is a heat exchanger that includes micro-scale flow channels. When liquid or gas flows into the flow channels in the microchannel heat exchanger, the phase change heat transfer coefficient of the liquid or gas can be increased, thereby improving the heat exchange capacity of the heat exchanger. However, when the microchannel heat exchanger is used as an evaporator, since the airflow in the heat exchanger flows along the flat tube direction, a temperature difference will be generated inside the heat exchanger, and the maximum temperature difference may exceed 15 degrees Celsius. For equipment with strict temperature control requirements, this evaporator with uneven heat output is not allowed to be used, which restricts the use scenarios of microchannel heat exchangers. Summary of the invention

[0004] In order to solve the above problems, a refrigeration system, a control method and an electrical device are provided in the embodiments of the present application, and a heating device and a temperature sensor are added to the existing refrigeration system. The heating device is arranged between the gas-liquid separator and the evaporator, and is used to heat the refrigerant flowing out of the evaporator, increase the superheat of the refrigerant, and prevent the liquid refrigerant from entering the compressor. The temperature sensor is arranged at the outlet of the evaporator, and is used to monitor the superheat of the refrigerant discharged from the outlet of the evaporator, and upload the monitoring results to the control unit. According to the monitoring results, the control unit controls the opening of the switch valve, the fan speed around the evaporator, the speed of the compressor, etc., so that the superheat of the refrigerant discharged from the outlet of the evaporator is maintained at 0°C or close to 0°C. The superheat of the refrigerant discharged from the outlet of the evaporator is maintained at 0°C or close to 0°C, indicating that the state of the refrigerant entering and leaving the evaporator is always in a two-phase state. After the two-phase refrigerant absorbs heat, the temperature does not change, so the temperature inside the entire evaporator can be kept consistent.

[0005] To this end, the following technical solutions are adopted in the embodiments of the present application:

[0006] In a first aspect, an embodiment of the present application provides a refrigeration system, comprising: a compressor, a condenser, a switch valve, a first evaporator, a first temperature sensor and a control unit, wherein the compressor, the condenser, the switch valve and the first evaporator are connected in sequence through a conduit to form a circulation loop; the first temperature sensor is embedded in the outlet of the first evaporator, and is used to detect the superheat of the refrigerant discharged from the outlet of the first evaporator; the control unit is electrically connected to the compressor, the switch valve and the first temperature sensor, respectively, and is used to receive first temperature data uploaded by the first temperature sensor, and determine whether the first temperature data is greater than a set threshold; and when the first temperature data is greater than the set threshold, a control instruction is sent to the compressor and / or the switch valve to increase the speed of the air pump in the compressor and / or increase the opening of the switch valve.

[0007] In this embodiment, a temperature sensor is provided at the outlet of the evaporator to monitor the superheat of the refrigerant discharged from the outlet of the evaporator. If the superheat detected by the temperature sensor is not greater than the set threshold value, that is, the superheat is 0°C or close to 0°C, it indicates that the refrigerant is always in a two-phase state when passing through the evaporator. Since the temperature of the two-phase refrigerant remains basically unchanged or changes very little after absorbing heat, it is ensured that the temperature at various locations inside the evaporator is basically the same. If the superheat detected by the temperature sensor is greater than the set threshold value, it indicates that the refrigerant is converted from a two-phase state to a gaseous state after passing through the evaporator. The control unit can reduce the superheat of the refrigerant in the circulation loop by increasing the speed of the air pump in the compressor and increasing the opening of the switch valve according to controlling the compressor and the switch valve, so that the refrigerant is always in a two-phase state after passing through the evaporator, ensuring that the temperature at various locations inside the evaporator is basically the same.

[0008] In one embodiment, it also includes: a second temperature sensor embedded in the inlet of the compressor, for detecting the superheat of the refrigerant sucked into the inlet of the compressor; the control unit is electrically connected to the second temperature sensor, and is also used to receive second temperature data uploaded by the second temperature sensor, and determine whether the second temperature data is greater than a set threshold; and when the second temperature data is not greater than the set threshold, a control instruction is sent to the compressor and / or the switch valve to reduce the speed of the air pump in the compressor and / or reduce the opening of the switch valve.

[0009] In this embodiment, the state of the refrigerant discharged from the outlet of the evaporator is generally two-phase. If liquid refrigerant enters the compressor, wet compression will occur inside the compressor, causing the compressor to overflow and unstable operation. In order to prevent the liquid refrigerant from flowing back into the compressor, a temperature sensor is set at the air inlet of the compressor. If the superheat detected by the temperature sensor is greater than the set threshold, that is, the superheat is greater than 0°C, it indicates that the refrigerant flowing into the compressor is in a gaseous state. If the superheat detected by the temperature sensor is not greater than the set threshold, it indicates that the refrigerant flowing into the compressor is in a two-phase state. The control unit can increase the superheat of the refrigerant in the circulation loop by reducing the speed of the air pump in the compressor and reducing the opening of the switch valve according to the control of the compressor and the switch valve, so that the refrigerant entering the compressor is in a gaseous state, ensuring the safe operation of the compressor.

[0010] In one embodiment, it also includes: at least one second fan, arranged around the first evaporator, for reducing the temperature of the first evaporator; the control unit, electrically connected to the at least one second fan, and further used to, when the first temperature data is greater than a set threshold, send a control instruction to the at least one first fan to reduce the rotation speed of the at least one second fan; and / or when the second temperature data is not greater than a set threshold, send a control instruction to the at least one first fan to increase the rotation speed of the at least one second fan.

[0011] In this embodiment, the second fan is arranged around the evaporator and is electrically connected to the external power supply through the control unit. When the control unit needs the evaporator to work, it can send a control instruction to the second fan to allow the external power supply to power the second fan. After the second fan rotates, the gas around the evaporator flows quickly, allowing the evaporator to better absorb the heat in the surrounding gas.

[0012] In addition, the control unit can also change the superheat of the refrigerant by controlling the rotation speed of the second fan. For example, if the temperature detected by the first temperature sensor is higher than the set threshold, the rotation speed of the second fan can be reduced to reduce the superheat of the refrigerant. If the temperature detected by the second temperature sensor is not higher than the set threshold, the rotation speed of the second fan can be increased to increase the superheat of the refrigerant.

[0013] In one embodiment, it also includes: a heating device, connected between the inlet of the compressor and the outlet of the first evaporator through a conduit, for heating the refrigerant in the circulation loop; the control unit, electrically connected to the heating device, is also used to send a control instruction to the heating device when the second temperature data is not greater than a set threshold value, so that the heating device heats the refrigerant in the circulation loop.

[0014] In this embodiment, since the outlet of the evaporator discharges a two-phase refrigerant, and the compressor inhales a gaseous refrigerant, the refrigerant discharged from the evaporator cannot flow directly into the compressor. Therefore, a heater is provided between the evaporator and the compressor. The heating device heats the refrigerant between the evaporator and the compressor, vaporizing the liquid refrigerant flowing out of the evaporator into a gaseous refrigerant, thereby increasing the superheat of the refrigerant entering the compressor.

[0015] In one embodiment, the heating device includes a regenerator and a first three-way valve, the regenerator includes a first channel and a second channel, the first channel is connected between the condenser and the outlet of the switch valve through a conduit, one end of the second channel is connected to the first end of the first three-way valve through a conduit, the other end of the second channel and the second end of the first three-way valve are connected to the inlet of the compressor through a conduit, and the third end of the first three-way valve is connected to the outlet of the first evaporator through a conduit.

[0016] In one embodiment, the control unit is electrically connected to the first three-way valve, and is specifically used to send a control instruction to the first three-way valve when the second temperature data is not greater than a set threshold value, so as to increase the opening of the first three-way valve and / or allow the first three-way valve to flow along a first direction, wherein the first direction is the direction from the first end of the first three-way valve to the third end of the first three-way valve.

[0017] In one embodiment, the heating device includes a second evaporator, a second three-way valve and at least one third fan, one end of the second evaporator is connected to the first end of the second three-way valve through a conduit, the other end of the second evaporator and the second end of the second three-way valve are connected to the inlet of the compressor through a conduit, and the third end of the second three-way valve is connected to the outlet of the first evaporator through a conduit; the at least one third fan is arranged around the second evaporator.

[0018] In one embodiment, the control unit is electrically connected to the second three-way valve and the at least one third fan, and is specifically used to send a control instruction to the second three-way valve when the second temperature data is not greater than a set threshold, to increase the speed of the at least one third fan, increase the opening of the second three-way valve and / or allow the second three-way valve to flow along a second direction, wherein the second direction is the direction from the first end of the second three-way valve to the third end of the second three-way valve.

[0019] In one embodiment, it further includes: an oil separator connected between the outlet of the compressor and the condenser through a conduit, and used to separate the oil liquid in the gaseous refrigerant.

[0020] In one embodiment, it also includes: a gas-liquid separator, which is connected between the inlet of the compressor and the outlet of the first evaporator through a conduit, or connected between the inlet of the compressor and the heating device through a conduit, for separating the liquid refrigerant.

[0021] In one embodiment, the set threshold is between 0°C and 1°C.

[0022] In this embodiment, since the outlet of the evaporator discharges a two-phase refrigerant, and the compressor inhales a gaseous refrigerant, the refrigerant discharged from the evaporator cannot flow directly into the compressor. Therefore, a heater is provided between the evaporator and the compressor. The heating device heats the refrigerant between the evaporator and the compressor, vaporizing the liquid refrigerant flowing out of the evaporator into a gaseous refrigerant, thereby increasing the superheat of the refrigerant entering the compressor.

[0023] In a second aspect, an embodiment of the present application provides a control method, which is executed by a control unit in each possible refrigeration system of the first aspect, including: receiving first temperature data uploaded by a first temperature sensor; determining whether the first temperature data is greater than a set threshold; when the first temperature data is greater than the set threshold, sending a first control instruction to at least one of a compressor, a switch valve, and at least one second fan, wherein the first control instruction is used to increase the speed of the air pump in the compressor, and / or increase the opening of the switch valve, and / or reduce the speed of the at least one second fan.

[0024] In this embodiment, a temperature sensor is provided at the outlet of the evaporator to monitor the superheat of the refrigerant discharged from the outlet of the evaporator. If the superheat detected by the temperature sensor is not greater than the set threshold value, that is, the superheat is 0°C or close to 0°C, it indicates that the refrigerant is always in a two-phase state when passing through the evaporator. Since the temperature of the two-phase refrigerant remains basically unchanged or changes very little after absorbing heat, it is ensured that the temperature inside the evaporator is basically the same everywhere. If the superheat detected by the temperature sensor is greater than the set threshold value, it indicates that the refrigerant is converted from a two-phase state to a gaseous state after passing through the evaporator. The control unit can reduce the superheat of the refrigerant in the circulation loop by increasing the speed of the air pump in the compressor, increasing the opening of the switch valve, and reducing the speed of the fan around the evaporator, so that the refrigerant is always in a two-phase state after passing through the evaporator, ensuring that the temperature inside the evaporator is basically the same everywhere.

[0025] In one embodiment, before receiving the first temperature data uploaded by the first temperature sensor, it includes: receiving the second temperature data uploaded by the second temperature sensor; judging whether the second temperature data is greater than the set threshold value; when the second temperature data is not greater than the set threshold value, sending a second control instruction to at least one of the compressor, the switch valve, the at least one second fan and the heating device, the second control instruction is used to reduce the speed of the air pump in the compressor, and / or reduce the opening of the switch valve, and / or increase the speed of the at least one second fan, and / or let the heating device heat the refrigerant in the circulation loop.

[0026] In this embodiment, the state of the refrigerant discharged from the outlet of the evaporator is generally two-phase. If liquid refrigerant enters the compressor, wet compression will occur inside the compressor, causing the compressor to overflow and unstable operation. In order to prevent the liquid refrigerant from flowing back into the compressor, a temperature sensor is set at the air inlet of the compressor to monitor the superheat of the refrigerant entering the compressor and report the monitored results to the control unit. The control unit can reduce the speed of the air pump in the compressor, increase the speed of the fan around the evaporator, reduce the opening of the switch valve, and allow the heating device to heat the refrigerant in the circulation loop, so that the refrigerant entering the compressor is in a gaseous state, ensuring the safe operation of the compressor.

[0027] In one embodiment, it also includes: receiving third temperature data uploaded by the second temperature sensor; determining whether the third temperature data is greater than the set threshold; when the third temperature data is not greater than the set threshold, sending a third control instruction to the heating device, and the third control instruction is used to allow the heating device to heat the refrigerant in the circulation loop.

[0028] In this embodiment, if the refrigerant discharged from the air outlet of the evaporator is in a two-phase state, the temperature sensor will report temperature data again at this time, and the control unit will increase the superheat of the refrigerant again after receiving the temperature data reported by the temperature sensor. In order to prevent the refrigerant with increased temperature from affecting the evaporator again, the superheat of the refrigerant entering the evaporator is not increased, and the superheat of the refrigerant discharged from the air outlet of the evaporator is increased. The control unit sends a control instruction to the heating device, allowing the heating device to increase the superheat of the refrigerant discharged from the air outlet of the evaporator.

[0029] In a third aspect, an embodiment of the present application provides an electrical device, including: a housing, at least one heat dissipation component, arranged inside the housing; and a refrigeration system as may be realized in the first aspect, arranged on the housing, and the temperature of the gas entering the housing is reduced by a first evaporator in the refrigeration system. The electrical device can be an electric vehicle, a base station, an outdoor cabinet, etc., as we understand it, or it can be broadly understood as a data center, an office, a workshop, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The following is a brief introduction to the drawings required for describing the embodiments or prior art.

[0031] Figure 1 A schematic diagram of the structure of a refrigeration system provided in the prior art;

[0032] Figure 2 This is a schematic diagram of the structure of the first refrigeration system provided in the embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of the structure of a second refrigeration system provided in an embodiment of the present application;

[0034] Figure 4 This is a schematic diagram of the structure of a third refrigeration system provided in an embodiment of the present application;

[0035] Figure 5 This is a schematic diagram of a first refrigeration system application scenario provided in an embodiment of the present application;

[0036] Figure 6 A flow chart of a control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0038] In the description of the present application, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0040] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0041] Figure 1FIG. 1 is a schematic diagram of a refrigeration system provided in the prior art. Figure 1 As shown, the refrigeration system includes a compressor, an oil separator, a condenser, an electronic expansion valve (EEV), an evaporator, a gas-liquid separator and a temperature sensor. The compressor, the oil separator, the condenser, the EEV, the evaporator, the gas-liquid separator and the temperature sensor are sequentially connected through a conduit to form a closed loop.

[0042] The compressor compresses the refrigerant vapor to obtain high-pressure refrigerant vapor, and drives the high-pressure refrigerant vapor to circulate in the entire loop. The oil separator separates the high-pressure refrigerant vapor, separates the lubricating oil in the high-pressure refrigerant vapor, and returns the lubricating oil to the compressor. When the high-pressure refrigerant vapor enters the condenser, the condenser allows the refrigerant vapor to exchange heat with the surrounding gas, lowers the temperature of the refrigerant vapor, and converts the refrigerant vapor from gas to liquid. The EEV acts as a switch to control the speed at which the liquid refrigerant enters the evaporator. If the opening of the EEV is relatively small, the liquid refrigerant flowing through the EEV will be converted into a two-phase refrigerant, that is, a gas-liquid mixed state. When the two-phase refrigerant enters the evaporator, the evaporator allows the two-phase refrigerant to exchange heat with the surrounding gas, lowering the temperature of the gas around the evaporator. The gas-liquid separator separates the two-phase refrigerant flowing out of the evaporator, separates the liquid refrigerant, and returns the gaseous refrigerant to the compressor. The temperature sensor is used to monitor the superheat of the refrigerant flowing out of the evaporator, so that the system can control the opening of the EEV, the fan speed around the evaporator, the speed of the compressor, etc., according to the superheat of the refrigerant, to ensure that the refrigerant sucked into the compressor's air inlet always has a certain degree of superheat. Among them, the superheat refers to the difference between the current temperature of the refrigerant and the evaporation temperature at the same evaporation pressure in the refrigeration cycle.

[0043] However, the evaporator in the existing refrigeration system adopts a microchannel heat exchanger. After the two-phase refrigerant enters the microchannel heat exchanger, the refrigerant will absorb the heat of the gas around the microchannel heat exchanger, and the state of the refrigerant will change from two-phase to gaseous. After the two-phase refrigerant absorbs heat, the temperature will not change, or the temperature change will be very small. After the gaseous refrigerant absorbs heat, the temperature will rise sharply. The part of the evaporator where the two-phase refrigerant circulates is called the two-phase area; the part of the evaporator where the gaseous refrigerant circulates is called the superheated area. Since the temperature of the two-phase area of ​​the evaporator is lower than that of the superheated area, the temperature at various positions on the surface of the heat exchanger is inconsistent. When the evaporator exchanges heat with the surrounding gas, the temperature of the gas lowered at each position of the heat exchanger is also different, resulting in the inability to accurately control the refrigeration temperature of the refrigeration system.

[0044] In order to solve the problems existing in the existing refrigeration system, the present application designs a refrigeration system. The refrigeration system protected by the embodiment of the present application includes all components or necessary components of the existing refrigeration system, and also includes a heating device and a temperature sensor.

[0045] The heating device is arranged between the gas-liquid separator and the evaporator, and is used to heat the refrigerant flowing out of the evaporator, increase the superheat of the refrigerant, and prevent the liquid refrigerant from entering the compressor. The temperature sensor is arranged at the outlet of the evaporator, and is used to monitor the superheat of the refrigerant discharged from the outlet of the evaporator, and upload the monitoring results to the control unit. According to the monitoring results, the control unit controls the opening of the EEV, the fan speed around the evaporator, the speed of the compressor, etc., so that the superheat of the refrigerant discharged from the outlet of the evaporator is maintained at 0℃ or close to 0℃. The superheat of the refrigerant is 0℃, the refrigerant is in a two-phase state, or it is just in a critical state where the liquid refrigerant disappears. The superheat of the refrigerant is close to 0℃, considering that the refrigerant is in a two-phase state and there is an uneven distribution of gas and liquid, which causes the superheat detected by the temperature sensor to be slightly higher than 0℃. The superheat of the refrigerant discharged from the outlet of the evaporator is maintained at 0℃ or close to 0℃, indicating that the state of the refrigerant entering and leaving the evaporator has always been in a two-phase state. After the two-phase refrigerant absorbs heat, the temperature does not change, so the temperature inside the entire evaporator can be kept consistent. Preferably, when the superheat of the refrigerant is between 0°C and 1°C, the refrigerant can be considered to be in a two-phase state.

[0046] It is conceivable that the evaporator used in the refrigeration system protected by the present application is not limited to the microchannel heat exchanger mentioned above, but can also be other types of heat exchangers. The present application only takes this as an example and does not limit it.

[0047] Figure 2 Schematic diagram of the structure of the first refrigeration system provided in the embodiment of the present application. Figure 2 As shown, the refrigeration system 200 includes a compressor 210, an oil separator 220, a condenser 230, a switch valve 240, an evaporator 250, a gas-liquid separator 260, a temperature sensor 270-1, at least one first fan 280-1, at least one second fan 280-2, a temperature sensor 270-2, a heating device 290 and a control unit 2100.

[0048] The compressor 210, the oil separator 220, the condenser 230, the switch valve 240, the evaporator 250 and the gas-liquid separator 260 are connected in sequence through a conduit to form a closed loop. The compressor 210 compresses the refrigerant vapor to obtain high-pressure refrigerant vapor, and drives the high-pressure refrigerant vapor to circulate in the entire loop. The oil separator 220 separates the high-pressure refrigerant vapor, separates the lubricating oil in the high-pressure refrigerant vapor, and returns the lubricating oil to the compressor 210. When the high-pressure refrigerant vapor enters the condenser 230, the condenser 230 allows the refrigerant vapor to exchange heat with the surrounding gas, reduces the temperature of the refrigerant vapor, and converts the refrigerant vapor from a gaseous state to a liquid state. The switch valve 240 can control the speed at which the liquid refrigerant enters the evaporator 250. If the opening of the switch valve 240 is relatively small, the liquid refrigerant flowing through the switch valve 240 will be converted into a two-phase refrigerant. When the two-phase refrigerant enters the evaporator 250, the evaporator 250 allows the two-phase refrigerant to exchange heat with the surrounding gas, thereby reducing the temperature of the gas around the evaporator 250. The gas-liquid separator 260 separates the two-phase refrigerant flowing out of the evaporator 250, separates the liquid refrigerant, and allows the gaseous refrigerant to flow back to the compressor 210.

[0049] The control unit 2100 establishes communication connection with the compressor 210, the switch valve 240, the temperature sensor 270-1, at least one first fan 280-1, at least one second fan 280-2, the temperature sensor 270-2 and the heating device 290 respectively, and can receive the data reported by each component, and process the received data, and issue control instructions to each component. The control unit 2100 can be a controller such as a proportional integral derivative (PID) control unit, a system on chipset (SoC), and a microcontroller unit (MCU). Preferably, the PID control unit is a control deviation formed according to a given value and an actual output value, and the deviation is linearly combined in a proportional, integral and differential manner to obtain a control amount, and the controlled object is controlled. The PID control unit has the characteristics of simple algorithm, good robustness, and high reliability. The control unit 2100 of the present application is preferably a PID control unit.

[0050] The compressor 210 is electrically connected to the external power supply through the control unit 2100. When the control unit 2100 requires the compressor 210 to work, it can send a control instruction to the compressor 210 to allow the external power supply to power the compressor 210. The air pump in the compressor 210 can compress the gaseous refrigerant to form high-pressure refrigerant vapor, and drive the high-pressure refrigerant vapor to circulate in the entire loop.

[0051] The first fan 280-1 is arranged around the condenser 230 and is electrically connected to the external power supply through the control unit 2100. When the control unit 2100 needs the condenser 230 to work, it can send a control instruction to the first fan 280-1 to allow the external power supply to power the first fan 280-1. After the first fan 280-1 rotates, the gas around the condenser 230 flows quickly, taking away the heat in the refrigerant inside the condenser 230, and increasing the speed at which the condenser 230 converts the gaseous refrigerant into a liquid refrigerant. Optionally, the first fan 280-1 establishes a communication connection with the control unit 2100. If the effect of cooling the refrigerant of the condenser 230 is not very good, the refrigerant circulates faster in the loop, and other factors, the control unit 2100 can send a control instruction to the first fan 280-1 to increase the rotation speed of the first fan 280-1, so as to accelerate the speed at which the condenser 230 cools the refrigerant. If the condenser 230 cools the refrigerant better and the refrigerant circulates slowly in the loop, the control unit 2100 can send a control instruction to the first fan 280-1 to reduce the rotation speed of the first fan 280-1, thereby reducing the energy consumption of the refrigeration system.

[0052] The second fan 280-2 is disposed around the evaporator 250 and is electrically connected to the external power supply through the control unit 2100. When the control unit 2100 requires the evaporator 250 to work, it can send a control instruction to the second fan 280-2 to allow the external power supply to power the second fan 280-2. After the second fan 280-2 rotates, the gas around the evaporator 250 flows quickly, allowing the evaporator 250 to better absorb the heat in the surrounding gas.

[0053] The switch valve 240 is connected between the condenser 230 and the evaporator 250 through a conduit, and is electrically connected to the control unit 2100. The control unit 2100 controls the opening of the switch valve 240 by sending a control instruction to the switch valve 240. Under normal circumstances, the refrigerant is in a gaseous state. When the liquid refrigerant passes through the switch valve 240, if the opening of the switch valve 240 is relatively small, the pressure of the liquid refrigerant enters the conduit between the switch valve 240 and the evaporator 250, and the pressure instantly decreases, and all or most of the liquid refrigerant is converted into a gaseous refrigerant. If the opening of the switch valve 240 is relatively large, the pressure change of the liquid refrigerant entering the conduit between the switch valve 240 and the evaporator 250 is relatively small, and a small amount or no liquid refrigerant is converted into a gaseous refrigerant. Therefore, the control unit 2100 can control the proportion of gaseous refrigerant and liquid refrigerant entering the evaporator 250 by controlling the opening of the switch valve 240. Preferably, the switch valve 240 is an EEV, but may also be other types of switch valves, which is not limited in the present application.

[0054] The compressor 210 generally includes an air pump and an air tank. When the air pump compresses the gaseous refrigerant, if liquid refrigerant enters the compressor 210, wet compression will occur inside the compressor 210, causing the compressor 210 to overflow and unstable operation. In order to prevent the liquid refrigerant from flowing back into the compressor 210, a gas-liquid separator 260 is usually connected to the air inlet of the compressor 210. The gas-liquid separator 260 separates the refrigerant flowing out of the evaporator 250, separates the liquid refrigerant, and allows the gaseous refrigerant to flow back into the compressor 210.

[0055] However, it is difficult for the existing gas-liquid separator 260 to achieve complete gas-liquid separation, so the present application sets a temperature sensor 270-1 at the air inlet of the compressor 210. The temperature sensor 270-1 can be inserted into the conduit between the compressor 210 and the gas-liquid separator 260, or placed at the inlet of the compressor 210, or set at the outlet of the gas-liquid separator 260. The temperature sensor 270-1 is used to monitor the superheat of the refrigerant entering the compressor 210, and report the monitored results to the control unit 2100. After receiving the results reported by the temperature sensor 270-1, the control unit 2100 determines whether the superheat monitored by the temperature sensor 270-1 is greater than the set threshold. When the superheat monitored by the temperature sensor 270-1 is greater than the set threshold, it indicates that the state of the refrigerant entering the compressor 210 is gaseous. The control unit 2100 discards the data reported this time, or does not perform the next step. When the superheat detected by the temperature sensor 270-1 is not greater than the set threshold, it indicates that the state of the refrigerant entering the compressor 210 is two-phase. If the two-phase refrigerant enters the compressor 210, wet compression will occur inside the compressor 210, causing the compressor 210 to over-current and unstable operation. Therefore, the control unit 2100 needs to increase the superheat of the refrigerant entering the compressor 210.

[0056] In a feasible embodiment, the control unit 2100 sends a control instruction to the compressor 210 to reduce the speed of the air pump in the compressor 210, thereby reducing the pressure of the refrigerant pumped out by the compressor 210. When other conditions remain unchanged, after the compressor 210 pumps out the refrigerant with a lower pressure, the proportion of liquid refrigerant in the refrigerant entering the evaporator 250 is reduced. At this time, the proportion of liquid refrigerant in the refrigerant output by the evaporator 250 is also reduced, thereby increasing the superheat of the refrigerant entering the compressor 210.

[0057] In a feasible embodiment, the control unit 2100 sends a control instruction to the second fan 280-2 to increase the speed of the second fan 280-2 and increase the speed at which the refrigerant in the evaporator 250 absorbs heat. When other conditions remain unchanged, after the evaporator 250 increases the speed at which the refrigerant absorbs heat, the proportion of liquid refrigerant in the refrigerant output by the evaporator 250 decreases, thereby increasing the superheat of the refrigerant entering the compressor 210.

[0058] In a feasible embodiment, the control unit 2100 sends a control instruction to the switch valve 240 to reduce the opening of the switch valve 240. When other conditions remain unchanged, after the opening of the switch valve 240 is reduced, the proportion of liquid refrigerant in the refrigerant entering the evaporator 250 is reduced. At this time, the proportion of liquid refrigerant in the refrigerant output by the evaporator 250 is also reduced, thereby increasing the superheat of the refrigerant entering the compressor 210.

[0059] In a feasible embodiment, the control unit 2100 sends a control instruction to the heating device 290 to start heating. The heating device 290 heats the conduit between the evaporator 250 and the gas-liquid separator 260 or the gas-liquid separator 260 to vaporize the liquid refrigerant flowing out of the evaporator 250 into a gaseous refrigerant, thereby increasing the superheat of the refrigerant entering the compressor 210.

[0060] The control unit 2100 can not only adopt the above-mentioned feasible embodiments to improve the superheat of the refrigerant entering the compressor 210, but also simultaneously adopt two or more of the above-mentioned feasible embodiments to improve the superheat of the refrigerant entering the compressor 210, and the present application does not limit this.

[0061] In order to achieve the same temperature everywhere inside the evaporator 250, the present application allows the refrigerant entering the evaporator 250 to be in a two-phase state. After the refrigerant enters the evaporator 250, it absorbs the heat in the gas around the evaporator 250 and vaporizes the liquid refrigerant into a gaseous refrigerant. If the refrigerant discharged from the air outlet of the evaporator 250 is still in a two-phase state, it can be proved that the refrigerant inside the evaporator 250 is always in a two-phase state. Therefore, the present application sets a temperature sensor 270-2 at the air inlet of the evaporator 250.

[0062] The temperature sensor 270-2 can be inserted into a conduit near the air outlet of the evaporator 250, or placed at the outlet of the evaporator 250. The temperature sensor 270-2 is used to monitor the superheat of the refrigerant discharged from the air outlet of the evaporator 250, and report the monitored result to the control unit 2100. After receiving the result reported by the temperature sensor 270-2, the control unit 2100 determines whether the superheat monitored by the temperature sensor 270-2 is greater than the set threshold value, and the set threshold value can be between 0°C and 1°C. When the superheat monitored by the temperature sensor 270-2 is not greater than the set threshold value, it means that the state of the refrigerant discharged from the air outlet of the evaporator 250 is a two-phase state. The control unit 2100 discards the data reported this time, or does not perform the next step. When the superheat monitored by the temperature sensor 270-2 is greater than the set threshold value, it means that the state of the refrigerant entering the compressor 210 is a gaseous state. At this time, the control unit 2100 needs to reduce the superheat of the refrigerant entering the evaporator 250, so that the refrigerant discharged from the exhaust port of the evaporator 250 is in a two-phase state, or is just in a critical state where the liquid refrigerant disappears.

[0063] In a feasible embodiment, the control unit 2100 sends a control instruction to the compressor 210, so that the air pump in the compressor 210 increases the speed and increases the pressure of the refrigerant pumped out by the compressor 210. When other conditions remain unchanged, after the compressor 210 pumps out the refrigerant with a higher pressure, the proportion of liquid refrigerant in the refrigerant entering the evaporator 250 increases. At this time, the proportion of liquid refrigerant in the refrigerant output by the evaporator 250 also increases, thereby reducing the superheat of the refrigerant discharged from the exhaust port of the evaporator 250 and making the superheat of the refrigerant at 0°C or close to 0°C.

[0064] In a feasible embodiment, the control unit 2100 sends a control instruction to the second fan 280-2 to reduce the speed of the second fan 280-2, thereby reducing the speed at which the refrigerant in the evaporator 250 absorbs heat. When other conditions remain unchanged, after the evaporator 250 reduces the speed at which the refrigerant absorbs heat, the proportion of liquid refrigerant in the refrigerant output by the evaporator 250 increases, thereby reducing the superheat of the refrigerant discharged from the exhaust port of the evaporator 250 and keeping the superheat of the refrigerant at 0°C or close to 0°C.

[0065] In a feasible embodiment, the control unit 2100 sends a control instruction to the second fan 280-2 to increase the opening of the switch valve 240. When other conditions remain unchanged, after the opening of the switch valve 240 increases, the proportion of liquid refrigerant in the refrigerant entering the evaporator 250 increases. At this time, the proportion of liquid refrigerant in the refrigerant output by the evaporator 250 also increases, thereby reducing the superheat of the refrigerant discharged from the exhaust port of the evaporator 250 and making the superheat of the refrigerant at 0°C or close to 0°C.

[0066] The control unit 2100 can not only adopt the above-mentioned feasible embodiments to reduce the superheat of the refrigerant discharged from the exhaust port of the evaporator 250, but also simultaneously adopt two or more of the above-mentioned feasible embodiments to reduce the superheat of the refrigerant discharged from the exhaust port of the evaporator 250, and the present application does not limit this.

[0067] In the present application, the refrigerant discharged from the air outlet of the evaporator 250 is in a two-phase state, and the refrigerant sucked into the air inlet of the compressor 210 is in a gaseous state. Therefore, only one gas-liquid separator 260 is connected between the evaporator 250 and the compressor 210. As the working time of the refrigeration system 200 increases, it is difficult for the gas-liquid separator 260 to completely separate the liquid refrigerant in the two-phase refrigerant. Therefore, a heating device 290 is provided between the evaporator 250 and the compressor 210 to convert the two-phase refrigerant discharged from the evaporator 250 into a gaseous refrigerant, which then flows into the compressor 210.

[0068] like Figure 2 As shown, the heating device 290 can be a heater, which is placed around the gas-liquid separator 260, or placed on the conduit between the evaporator 250 and the compressor 210, and is used to convert the two-phase refrigerant discharged from the evaporator 250 into a gaseous refrigerant. The heating device 290 is electrically connected to the external power supply through the control unit 2100. The control unit 2100 receives the detection results reported by the two temperature sensors, controls the heating device 290 to work according to the detection results, and controls the heating device 290 to heat with a set power according to the increase in the superheat value of the refrigerant. In this embodiment, a heater that is more common in daily life is used as a heating device, which can reduce the manufacturing cost of the refrigeration system 200. The way in which the heating device increases the superheat of the refrigerant is to convert electrical energy into thermal energy, which will cause the energy in the refrigeration system to increase, which is not conducive to the refrigeration effect of the refrigeration system. Therefore, the control unit 2100 will start the heater for heating only when the effect of increasing the superheat of the refrigerant is not ideal by controlling the compressor 210, the second fan 280-2 and the switch valve 240.

[0069] like Figure 3As shown, the heating device 290 includes a regenerator 291 and a three-way valve 292, and the regenerator 291 includes a first channel and a second channel. The first channel in the regenerator 291 is connected between the condenser 230 and the switch valve 240. The second channel in the regenerator 291 is connected in series with the three-way valve 292, and then connected between the evaporator 250 and the gas-liquid separator 260. The three-way valve 292 is connected to the end of the regenerator 291 close to the evaporator 250. The third end of the three-way valve 292 is connected to the end of the regenerator 291 close to the gas-liquid separator 260 through a conduit. The three-way valve 292 is electrically connected to the control unit 2100. The control unit 2100 controls the opening degree and the flow direction of the three-way valve 292 by sending a control instruction to the three-way valve 292.

[0070] Normally, the temperature of the refrigerant discharged from the outlet of the condenser 230 is about 35°C to 50°C, and the temperature of the refrigerant discharged from the outlet of the evaporator 250 is about 10°C to 18°C, that is, the superheat is about 0°C. If the control unit 2100 detects that the superheat is 0°C or close to 0°C according to the temperature sensor 280-2, that is, the state of the refrigerant discharged from the outlet of the evaporator 250 is a two-phase state. At this time, the control unit 2100 sends a control instruction to the three-way valve 292, so that the three-way valve 292 opens the passage for the refrigerant to flow into the first channel in the regenerator 291, and closes the passage for the refrigerant to bypass the regenerator 291 and directly flow into the gas-liquid separator 260.

[0071] When the refrigerant discharged from the outlet of the condenser 230 enters the first channel in the regenerator 291, and the refrigerant discharged from the outlet of the evaporator 250 enters the second channel in the regenerator 291, the two channels in the regenerator 291 perform heat exchange, lowering the temperature of the refrigerant in the first channel and raising the temperature of the refrigerant in the second channel. The present application transfers the heat in the refrigerant discharged from the outlet of the condenser 230 to the refrigerant discharged from the outlet of the evaporator 250 through the regenerator 291, thereby converting the two-phase refrigerant discharged from the evaporator 250 into a gaseous refrigerant.

[0072] If the control unit 2100 detects that the superheat is 0°C or close to 0°C according to the temperature sensor 270-2, that is, the state of the refrigerant discharged from the outlet of the evaporator 250 is two-phase, and the proportion of liquid refrigerant is relatively high. At this time, the control unit 2100 sends a control instruction to the three-way valve 292, allowing the three-way valve 292 to open the passage for the refrigerant to flow into the first channel in the regenerator 291, and close the passage for the refrigerant to bypass the regenerator 291 and directly flow into the gas-liquid separator 260. In addition, the opening of the three-way valve 292 is reduced, further increasing the superheat of the refrigerant.

[0073] If the control unit 2100 detects that the superheat is greater than 0°C according to the temperature sensor 270-2, that is, the state of the refrigerant discharged from the outlet of the evaporator 250 is gaseous, the control unit 2100 sends a control instruction to the three-way valve 292, so that the three-way valve 292 closes the passage for the refrigerant to flow into the first channel in the regenerator 291, and opens the passage for the refrigerant to bypass the regenerator 291 and directly flow into the gas-liquid separator 260. At this time, the refrigerant discharged from the evaporator 250 flows directly into the gas-liquid separator 260 through the three-way valve 292.

[0074] In this embodiment, the heating device 290 includes a regenerator, which converts the two-phase refrigerant discharged from the evaporator 250 into a gaseous refrigerant by exchanging heat between the refrigerant discharged from the outlet of the condenser 230 and the refrigerant discharged from the outlet of the evaporator 250. Figure 2 The refrigeration system in this embodiment has relatively low energy consumption.

[0075] like Figure 4 As shown, the heating device 290 includes an auxiliary evaporator 293, a three-way valve 294 and at least one third fan 295. The auxiliary evaporator 293 and the three-way valve 294 are connected in series, and then connected between the evaporator 250 and the gas-liquid separator 260. The three-way valve 294 is connected to the end of the regenerator 291 close to the evaporator 250. The third end of the three-way valve 294 is connected to the end of the auxiliary evaporator 293 close to the gas-liquid separator 260 through a conduit. The three-way valve 294 is electrically connected to the control unit 2100. The control unit 2100 controls the opening degree of the three-way valve 294 and the flow direction of the three-way valve 294 by sending a control instruction to the three-way valve 294.

[0076] The third fan 295 is disposed around the auxiliary evaporator 293 and is electrically connected to the external power supply through the control unit 2100. When the control unit 2100 needs the auxiliary evaporator 293 to work, it can send a control instruction to the third fan 295 to allow the external power supply to power the third fan 295. After the third fan 295 rotates, the gas around the auxiliary evaporator 293 flows quickly, allowing the auxiliary evaporator 293 to better absorb the heat in the surrounding gas and convert the two-phase refrigerant into a gaseous refrigerant.

[0077] If the control unit 2100 detects that the superheat is 0°C according to the temperature sensor 270-2, that is, the state of the refrigerant discharged from the outlet of the evaporator 250 is two-phase. At this time, the control unit 2100 sends a control instruction to the three-way valve 294, so that the three-way valve 294 opens the passage for the refrigerant to flow into the auxiliary evaporator 293, and closes the passage for the refrigerant to bypass the auxiliary evaporator 293 and directly flow into the gas-liquid separator 260. In addition, the control unit 2100 sends a control instruction to the third fan 295, so that the third fan 295 rotates, so as to transfer the heat in the gas around the auxiliary evaporator 293 to the refrigerant in the auxiliary evaporator 293, and convert the two-phase refrigerant into a gaseous refrigerant.

[0078] If the control unit 2100 detects that the superheat is close to 0°C according to the temperature sensor 270-2, that is, the state of the refrigerant discharged from the outlet of the evaporator 250 is two-phase, and the proportion of liquid refrigerant is relatively high. At this time, the control unit 2100 sends a control instruction to the three-way valve 294, allowing the three-way valve 294 to open the passage for the refrigerant to flow into the auxiliary evaporator 293 and close the passage for the refrigerant to bypass the auxiliary evaporator 293 and directly flow into the gas-liquid separator 260. In addition, the opening of the three-way valve 294 is reduced, further increasing the superheat of the refrigerant.

[0079] If the control unit 2100 detects that the superheat is greater than 0°C according to the temperature sensor 270-2, that is, the state of the refrigerant discharged from the outlet of the evaporator 250 is gaseous, the control unit 2100 sends a control instruction to the three-way valve 294, so that the three-way valve 294 closes the passage for the refrigerant to flow into the auxiliary evaporator 293, and opens the passage for the refrigerant to bypass the auxiliary evaporator 293 and directly flow into the gas-liquid separator 260. At this time, the refrigerant discharged from the evaporator 250 flows directly into the gas-liquid separator 260 through the three-way valve 294.

[0080] In this embodiment, the heating device 290 includes a secondary evaporator 293 and a third fan 295 heat regenerator. The secondary evaporator 293 is used to exchange heat between the refrigerant discharged from the outlet of the condenser 230 and the gas around the secondary evaporator 293, so as to convert the two-phase refrigerant discharged from the evaporator 250 into a gaseous refrigerant. The third fan 295 blows the cooled gas around the secondary evaporator 293 to other heat dissipation components in the refrigeration system, such as the compressor 210, so as to reduce the temperature of other heat dissipation components in the refrigeration system. Optionally, Figure 4 The heating device 290 in the embodiment can also be connected between the switch valve 240 and the evaporator 250 to achieve the same effect as that of Figure 5 The connection method is the same as in .

[0081] Figure 5 This is a schematic diagram of the first refrigeration system application scenario provided in the embodiment of the present application. Figure 5As shown, the scene includes a refrigeration system 200 and a space 300 that needs to be cooled. The space 300 can be a member cabin in an electric car, a space for storing heat dissipation components in a data center, and the like. A channel is provided on the space 300, and the evaporator 250 in the refrigeration system 200 can be installed in the channel, or in the space 300. The second fan 280-2 is installed at the air inlet of the channel. When the refrigeration system 200 is operating normally, the second fan 280-2 blows the gas outside the space 300 into the channel. The gas in the channel performs heat exchange with the refrigerant in the evaporator 250, transfers the heat in the gas to the refrigerant, and reduces the temperature of the gas. The cooled gas enters the space 300 along with the airflow, so that the refrigeration system 200 reduces the temperature of the space 300.

[0082] The present application embodiment provides an electrical device, which includes a heat dissipation component and a Figure 1-Figure 5 And the refrigeration system recorded in the above-mentioned corresponding protection scheme. The heat dissipation component is deployed in a relatively closed space inside the electrical equipment, and the evaporator in the refrigeration system is located in the space. When the refrigeration system works normally, the fan blows the external gas into the interior of the electrical equipment through the evaporator to reduce the temperature inside the electrical equipment. Since the electrical equipment includes a refrigeration system, the electrical equipment has all or part of the advantages of the refrigeration system. Among them, the electrical equipment can be what we understand as electric vehicles, base stations, outdoor cabinets, etc., and can also be broadly understood as data centers, offices, workshops, etc.

[0083] Figure 6 This is a flow chart of a control method provided in an embodiment of the present application. Figure 6 As shown, the control method can be executed by the above-mentioned improved control unit 2100, and the specific execution steps are as follows:

[0084] Step S601, receiving first temperature data uploaded by a first temperature sensor. The first temperature sensor is the temperature sensor 270-2.

[0085] Step S602, determining whether the first temperature data is greater than a set threshold.

[0086] Step S603: When the first temperature data is greater than a set threshold, a first control instruction is sent to at least one of the compressor, the switch valve, and the at least one second fan. The first control instruction is used to increase the speed of the air pump in the compressor, and / or increase the opening of the switch valve, and / or reduce the speed of the at least one second fan.

[0087] Combination Figure 2-Figure 5In the refrigeration system 200 shown in the present application, in order to achieve the same temperature at various places inside the evaporator 250, the refrigerant entering the evaporator 250 is always in a two-phase state. If the refrigerant discharged from the air outlet of the evaporator 250 is still in a two-phase state, it can be proved that the refrigerant inside the evaporator 250 is always in a two-phase state. A temperature sensor 270-2 is set at the air inlet of the evaporator 250. The temperature sensor 270-2 can be inserted into a conduit near the air outlet of the evaporator 250, or placed at the outlet of the evaporator 250. The temperature sensor 270-2 is used to monitor the superheat of the refrigerant discharged from the air outlet of the evaporator 250, and report the monitored results to the control unit 2100. After receiving the results reported by the temperature sensor 270-2, the control unit 2100 determines whether the superheat monitored by the temperature sensor 270-2 is greater than the set threshold value, and the set threshold value can be between 0°C and 1°C. When the superheat detected by the temperature sensor 270-2 is not greater than the set threshold, it means that the state of the refrigerant discharged from the outlet of the evaporator 250 is in a two-phase state. The control unit 2100 discards the data reported this time, or does not perform the next operation. When the superheat detected by the temperature sensor 270-2 is greater than the set threshold, it means that the state of the refrigerant entering the compressor 210 is in a gaseous state. At this time, the control unit 2100 needs to reduce the superheat of the refrigerant entering the evaporator 250, so that the refrigerant discharged from the exhaust port of the evaporator 250 is in a two-phase state, or is just in a critical state where the liquid refrigerant disappears.

[0088] There are many ways for the control unit 2100 to reduce the superheat of the refrigerant entering the evaporator 250, such as increasing the speed of the air pump in the compressor 210, reducing the speed of the second fan 280-2, increasing the opening of the switch valve 240, etc., which are not limited in this application.

[0089] The state of the refrigerant discharged from the outlet of the evaporator 250 is generally a two-phase state. If liquid refrigerant enters the compressor 210, wet compression will occur inside the compressor 210, causing the compressor 210 to overflow and unstable operation. In order to prevent the liquid refrigerant from flowing back into the compressor 210, a temperature sensor 270-1 is set at the air inlet of the compressor 210. The temperature sensor 270-1 can be inserted into the conduit between the compressor 210 and the gas-liquid separator 260, or placed at the inlet of the compressor 210, or set at the outlet of the gas-liquid separator 260. The temperature sensor 270-1 is used to monitor the superheat of the refrigerant entering the compressor 210, and report the monitored results to the control unit 2100.

[0090] Therefore, before executing step S601, the control unit 2100 needs to monitor the state of the refrigerant entering the compressor 210 through the temperature sensor 270-1. The specific implementation process is as follows:

[0091] Step S601A, receiving second temperature data uploaded by a second temperature sensor. The second temperature sensor is the temperature sensor 270-1.

[0092] Step S601B, determining whether the second temperature data is greater than a set threshold;

[0093] Step S601C, when the second temperature data is not greater than the set threshold, a second control instruction is sent to at least one of the compressor, the switch valve, the at least one second fan and the heating device. The second control instruction is used to reduce the speed of the air pump in the compressor, and / or reduce the opening of the switch valve, and / or increase the speed of the at least one second fan, and / or allow the heating device to heat the refrigerant in the circulation loop.

[0094] Combination Figure 2-Figure 5 In the refrigeration system 200 shown, after the control unit 2100 receives the result reported by the temperature sensor 270-1, it determines whether the superheat detected by the temperature sensor 270-1 is greater than the set threshold. When the superheat detected by the temperature sensor 270-1 is greater than the set threshold, it means that the state of the refrigerant entering the compressor 210 is gaseous. The control unit 2100 discards the data reported this time, or does not perform the next step. When the superheat detected by the temperature sensor 270-1 is not greater than the set threshold, it means that the state of the refrigerant entering the compressor 210 is two-phase. The control unit 2100 needs to increase the superheat of the refrigerant entering the compressor 210.

[0095] There are many ways for the control unit 2100 to increase the superheat of the refrigerant entering the compressor 210, such as reducing the speed of the air pump in the compressor 210, increasing the speed of the second fan 280-2, reducing the opening of the switch valve 240, allowing the heating device 290 to heat the refrigerant in the circulation loop, etc. This application does not limit this.

[0096] After the control unit 2100 executes step S603, if the refrigerant discharged from the air outlet of the evaporator 250 is in a two-phase state, the temperature sensor 270-1 will report temperature data again. After receiving the temperature data reported by the temperature sensor 270-1, the control unit 2100 will increase the superheat of the refrigerant again. In order to prevent the refrigerant with increased temperature from affecting the evaporator 250 again, the superheat of the refrigerant entering the evaporator 250 is not increased, and the superheat of the refrigerant discharged from the air outlet of the evaporator 250 is increased. The control unit 2100 sends a control instruction to the heating device 290, so that the heating device 290 increases the superheat of the refrigerant discharged from the air outlet of the evaporator 250.

[0097] Therefore, after executing step S603, the control unit 2100 may optionally need to monitor the state of the refrigerant entering the compressor 210 again through the temperature sensor 270-1. The specific implementation process is as follows:

[0098] Step S604: receiving third temperature data uploaded by the second temperature sensor.

[0099] Step S605, determining whether the third temperature data is greater than a set threshold.

[0100] Step S606: When the third temperature data is not greater than the set threshold, a third control instruction is sent to the heating device, wherein the third control instruction is used to allow the heating device to heat the refrigerant in the circulation loop.

[0101] In an example that can be implemented, Figure 2 As shown, the heating device 290 is electrically connected to the external power supply through the control unit 2100. After receiving the temperature data reported by the temperature sensor 270-1 and determining to increase the superheat value of the refrigerant, the control unit 2100 sends a control instruction to the heating device 290. After receiving the control instruction, the heating device 290 is connected to the external power supply and then heats the refrigerant according to the set power.

[0102] In an example that can be implemented, Figure 3 As shown, the control unit 2100 is electrically connected to the three-way valve 292. After receiving the temperature data reported by the temperature sensor 270-1 and determining the value of the superheat of the refrigerant to be increased, the control unit 2100 sends a control instruction to the three-way valve 292. The control unit 2100 increases the superheat of the refrigerant by controlling the opening of the three-way valve 292 and the flow direction of the three-way valve 292. For example, when the flow direction of the three-way valve 292 is that the refrigerant enters the second channel of the regenerator 291 from the evaporator 250, the opening of the three-way valve 292 can be reduced to increase the superheat of the refrigerant. For another example, when the flow direction of the three-way valve 292 is that the refrigerant enters the gas-liquid separator 260 from the evaporator 250, the opening of the three-way valve 292 can be reduced to increase the superheat of the refrigerant.

[0103] In an example that can be implemented, Figure 4As shown, the control unit 2100 is electrically connected to the three-way valve 294 and the third fan 295, respectively. After receiving the temperature data reported by the temperature sensor 270-1 and determining to increase the superheat value of the refrigerant, the control unit 2100 sends a control instruction to the three-way valve 294 and the third fan 295. The control unit 2100 increases the superheat of the refrigerant by controlling the opening of the three-way valve 294, the flow direction of the three-way valve 294 and the rotation speed of the third fan 295. For example, when the flow direction of the three-way valve 294 is that the refrigerant enters the evaporator 293 from the evaporator 250, the opening of the three-way valve 294 can be reduced and the rotation speed of the third fan 295 can be increased to increase the superheat of the refrigerant. For another example, when the flow direction of the three-way valve 294 is that the refrigerant enters the gas-liquid separator 260 from the evaporator 250, the opening of the three-way valve 294 can be reduced to increase the superheat of the refrigerant.

[0104] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed in a computer, the computer executes the above Figure 6 and any method described in the corresponding description.

[0105] In an embodiment of the present application, a computer program product is also provided, wherein the computer program product stores instructions, and when the instructions are executed by a computer, the computer implements the above Figure 6 and any method described in the corresponding description.

[0106] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present application.

[0107] The above is only a specific implementation of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited to this. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the embodiments of the present application, which should be covered within the protection scope of the embodiments of the present application.

Claims

1. A refrigeration system, characterized in that: include: A compressor, a condenser, a switch valve, a first evaporator, a first temperature sensor, a second temperature sensor, a gas-liquid separator and a control unit, The compressor, the condenser, the switch valve, the first evaporator and the gas-liquid separator are connected in sequence through a conduit to form a circulation loop; The first temperature sensor is embedded in the outlet of the first evaporator and is used to detect the superheat of the refrigerant discharged from the outlet of the first evaporator; A second temperature sensor, embedded at the inlet of the compressor, for detecting the superheat of the refrigerant sucked into the inlet of the compressor; The control unit is electrically connected to the compressor, the switch valve and the first temperature sensor, respectively, and is used to receive the first temperature data uploaded by the first temperature sensor, and determine whether the first temperature data is greater than a set threshold value, wherein the set threshold value is between 0°C and 1°C; and when the first temperature data is greater than the set threshold value, send a control instruction to the compressor and / or the switch valve; the control instruction is used to increase the speed of the air pump in the compressor and / or increase the opening of the switch valve, so that the refrigerant discharged from the outlet of the first evaporator is in a two-phase state; The control unit is electrically connected to the second temperature sensor, and is also used to receive the second temperature data uploaded by the second temperature sensor, and determine whether the second temperature data is greater than the set threshold; and when the second temperature data is not greater than the set threshold, send a control instruction to the compressor and / or the switch valve to reduce the speed of the air pump in the compressor and / or reduce the opening of the switch valve.

2. The refrigeration system according to claim 1, characterized in that: Also includes: at least one second fan, disposed around the first evaporator, for lowering the temperature of the first evaporator; The control unit is electrically connected to the at least one second fan, and is further configured to, when the first temperature data is greater than a set threshold, send a control instruction to the at least one first fan to reduce a rotation speed of the at least one second fan; and / or When the second temperature data is not greater than a set threshold, a control instruction is sent to the at least one first fan to increase the rotation speed of the at least one second fan.

3. The refrigeration system according to any one of claims 1 or 2, characterized in that: Also includes: a heating device, connected between the inlet of the compressor and the outlet of the first evaporator through a conduit, for heating the refrigerant in the circulation loop; The control unit is electrically connected to the heating device, and is also used to send a control instruction to the heating device when the second temperature data is not greater than a set threshold value, so that the heating device heats the refrigerant in the circulation loop.

4. The refrigeration system according to claim 3, characterized in that: The heating device comprises a regenerator and a first three-way valve, The regenerator includes a first channel and a second channel, the first channel is connected between the condenser and the outlet of the switch valve through a conduit, one end of the second channel is connected to the first end of the first three-way valve through a conduit, the other end of the second channel and the second end of the first three-way valve are connected to the inlet of the compressor through a conduit, and the third end of the first three-way valve is connected to the outlet of the first evaporator through a conduit.

5. The refrigeration system according to claim 4, characterized in that: The control unit is electrically connected to the first three-way valve, and is specifically used to send a control instruction to the first three-way valve when the second temperature data is not greater than a set threshold value, so as to increase the opening of the first three-way valve and / or allow the first three-way valve to flow along a first direction, wherein the first direction is the direction from the first end of the first three-way valve to the third end of the first three-way valve.

6. The refrigeration system according to claim 4, characterized in that: The heating device comprises a second evaporator, a second three-way valve and at least one third fan, one end of the second evaporator is connected to the first end of the second three-way valve through a conduit. end, the other end of the second evaporator and the second end of the second three-way valve are connected to the inlet of the compressor through a conduit, and the third end of the second three-way valve is connected to the outlet of the first evaporator through a conduit; and the at least one third fan is arranged around the second evaporator.

7. The refrigeration system according to claim 6, characterized in that: The control unit is electrically connected to the second three-way valve and the at least one third fan, and is specifically used to send a control instruction to the second three-way valve when the second temperature data is not greater than a set threshold, to increase the speed of the at least one third fan, increase the opening of the second three-way valve and / or allow the second three-way valve to circulate along a second direction, wherein the second direction is the direction from the first end of the second three-way valve to the third end of the second three-way valve.

8. The refrigeration system according to any one of claims 1 or 2, characterized in that: Also includes: The oil separator is connected between the outlet of the compressor and the condenser through a conduit and is used to separate the oil liquid in the gaseous refrigerant.

9. The refrigeration system according to claim 3, characterized in that: Also includes: The gas-liquid separator is connected between the inlet of the compressor and the heating device through a conduit, and is used to separate the liquid refrigerant.

10. A control method, characterized in that: The method is performed by a control unit according to any one of claims 1 to 9, comprising: Receiving first temperature data uploaded by a first temperature sensor; Determine whether the first temperature data is greater than a set threshold, where the set threshold is between 0°C and 1°C; When the first temperature data is greater than the set threshold, a first control instruction is sent to at least one of the compressor, the switch valve, and at least one second fan, and the first control instruction is used to increase the speed of the air pump in the compressor, and / or increase the opening of the switch valve, and / or reduce the speed of the at least one second fan.

11. The method according to claim 10, characterized in that Before the receiving of the first temperature data uploaded by the first temperature sensor, the method includes: Receiving second temperature data uploaded by a second temperature sensor; Determining whether the second temperature data is greater than the set threshold; When the second temperature data is not greater than the set threshold, a second control instruction is sent to at least one of the compressor, the switch valve, the at least one second fan and the heating device, and the second control instruction is used to reduce the speed of the air pump in the compressor, and / or reduce the opening of the switch valve, and / or increase the speed of the at least one second fan, and / or allow the heating device to heat the refrigerant in the circulation loop.

12. The method according to claim 11, characterized in that Also includes: Receiving third temperature data uploaded by the second temperature sensor; Determining whether the third temperature data is greater than the set threshold; When the third temperature data is not greater than the set threshold, a third control instruction is sent to the heating device, where the third control instruction is used to allow the heating device to heat the refrigerant in the circulation loop.

13. An electrical equipment, characterized in that: include: shell, at least one heat dissipation component disposed inside the housing; The refrigeration system according to any one of claims 1 to 9 is arranged on the shell, and the temperature of the gas entering the interior of the shell is reduced by the first evaporator in the refrigeration system.

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