CN114963634A

CN114963634A - Refrigerating system, control method and electric equipment

Info

Publication number: CN114963634A
Application number: CN202210453649.3A
Authority: CN
Inventors: 郝裕伟; 郑尧; 宋金良
Original assignee: Xi'an Huawei Digital Energy Technology Co ltd
Current assignee: Xi'an Huawei Digital Energy Technology Co ltd
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2022-08-30

Abstract

The application provides a refrigeration system, a control method and electric equipment, and relates to the technical field of refrigeration. The refrigerating system comprises part or all of the necessary components of the existing refrigerating system, and a temperature sensor is also arranged at the outlet of the evaporator to monitor the superheat degree of the refrigerant discharged from the outlet of the evaporator. If the superheat degree detected by the temperature sensor is not larger than the set threshold value, the refrigerant flowing through the evaporator is always in a two-phase state. After the two-phase refrigerant absorbs heat, the temperature is basically unchanged or slightly changed, so that the temperature of each part in the evaporator is basically the same. If the superheat degree detected by the temperature sensor is larger than a set threshold value, the refrigerant is converted from a two-phase state into a gaseous state after flowing through the evaporator. The control unit can reduce the superheat degree of the refrigerant in the circulation loop by increasing the rotating speed of the air pump in the compressor and increasing the opening degree of the switch valve, so that the refrigerant is always in a two-phase state after flowing through the evaporator, and the temperature of each part in the evaporator is ensured to be basically the same.

Description

Refrigerating system, control method and electric equipment

Technical Field

The invention relates to the technical field of refrigeration, in particular to a refrigeration system, a control method and electric equipment.

Background

Existing data centers, electric vehicles and the like are all provided with refrigeration systems. The refrigerating system comprises a heat exchanger, and the heat exchanger can exchange heat with ambient air through liquid or gas circulating in the heat exchanger to reduce or increase the temperature of the ambient air.

Taking a microchannel heat exchanger as an example, the microchannel heat exchanger is a heat exchanger comprising a flow channel with a fine scale, and after liquid or gas flows into the flow channel in the microchannel heat exchanger, the phase change heat transfer coefficient of the liquid or gas can be improved, so that the heat exchange capacity of the heat exchanger is improved. However, when the microchannel heat exchanger is used as an evaporator, because the airflow in the heat exchanger flows along the flat tube direction, a temperature difference is generated inside the heat exchanger, and the maximum temperature difference may exceed 15 ℃. For equipment with strict temperature control requirements, the evaporator with uneven heat output is not allowed to be used, and the use scene of the micro-channel heat exchanger is limited.

Disclosure of Invention

In order to solve the above problems, embodiments of the present application provide a refrigeration system, a control method, and an electric device, in which a heating device and a temperature sensor are added to an existing refrigeration system. The heating device is arranged between the gas-liquid separator and the evaporator and used for heating the refrigerant flowing out of the evaporator, improving the superheat degree of the refrigerant and preventing the liquid refrigerant from entering the compressor. The temperature sensor is arranged at the outlet of the evaporator and used for monitoring the superheat degree of the refrigerant discharged from the outlet of the evaporator and uploading the monitoring result to the control unit. The control unit controls the opening of the switch valve, the rotating speed of the fan around the evaporator, the rotating speed of the compressor and the like according to the monitoring result, so that the superheat degree of the refrigerant discharged from the outlet of the evaporator is kept at 0 ℃ or close to 0 ℃. The superheat degree of the refrigerant discharged from the outlet of the evaporator is kept at 0 ℃ or close to 0 ℃, which shows that the state of the refrigerant entering and exiting the evaporator is always in a two-phase state. After the two-phase refrigerant absorbs heat, the temperature does not change, so that the temperature in the whole evaporator can be kept consistent.

Therefore, the following technical scheme is adopted in the embodiment of the application:

in a first aspect, an embodiment of the present application provides a refrigeration system, including: the system comprises 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 sequentially connected through a conduit to form a circulation loop; the first temperature sensor is embedded in the outlet of the first evaporator and is used for detecting the superheat degree of the refrigerant discharged from the outlet of the first evaporator; the control unit is respectively electrically connected with the compressor, the switch valve and the first temperature sensor, and is used for receiving first temperature data uploaded by the first temperature sensor and judging whether the first temperature data is greater than a set threshold value; and when the first temperature data is larger than a set threshold value, sending a control instruction to the compressor and/or the switch valve, and increasing the rotating speed of the air pump in the compressor and/or increasing the opening of the switch valve.

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 degree detected by the temperature sensor is not larger than a set threshold value, namely the superheat degree is 0 ℃ or close to 0 ℃, the refrigerant flowing through the evaporator is always in a two-phase state. After the two-phase refrigerant absorbs heat, the temperature is basically unchanged or slightly changed, so that the temperature of each part in the evaporator is basically the same. If the superheat degree detected by the temperature sensor is larger than a set threshold value, the refrigerant is converted from a two-phase state into a gaseous state after flowing through the evaporator. The control unit can reduce the superheat degree of the refrigerant in the circulation loop by improving the rotating speed of the air pump in the compressor and improving the opening degree of the switch valve according to the control of the compressor and the switch valve, so that the refrigerant is always in a two-phase state after flowing through the evaporator, and the temperature of each part in the evaporator is ensured to be basically the same.

In one embodiment, the method further comprises: the second temperature sensor is embedded in the inlet of the compressor and used for detecting the superheat degree of the refrigerant sucked by the inlet of the compressor; the control unit is electrically connected with the second temperature sensor and is also used for receiving second temperature data uploaded by the second temperature sensor and judging whether the second temperature data is greater than a set threshold value or not; and when the second temperature data is not greater than a set threshold value, sending a control instruction to the compressor and/or the switch valve, and reducing the rotating speed of the air pump in the compressor and/or reducing the opening of the switch valve.

In this embodiment, the refrigerant discharged from the outlet of the evaporator is generally in a two-phase state, and if a liquid refrigerant enters the compressor, wet compression occurs inside the compressor, which causes the compressor to overflow and unstable operation. In order to avoid the liquid refrigerant from flowing back to the compressor, a temperature sensor is arranged at the air inlet of the compressor. If the superheat degree detected by the temperature sensor is larger than a set threshold value, namely the superheat degree is larger than 0 ℃, the condition indicates that the refrigerant flowing into the compressor is in a gaseous state. If the superheat degree detected by the temperature sensor is not more than the set threshold value, the refrigerant flowing into the compressor is in a two-phase state. The control unit can control the compressor and the switch valve, and improve the superheat degree of the refrigerant in the circulation loop by reducing the rotating speed of the air pump in the compressor and reducing the opening degree of the switch valve, so that the refrigerant entering the compressor is in a gaseous state, and the safe operation of the compressor is ensured.

In one embodiment, the method further comprises: at least one second fan disposed around the first evaporator for reducing a temperature of the first evaporator; the control unit is electrically connected with the at least one second fan and is further used for controlling an instruction to the at least one first fan to reduce the rotating speed of the at least one second fan when the first temperature data is greater than a set threshold value; and/or when the second temperature data is not greater than a set threshold value, giving a control instruction to the at least one first fan to increase the rotating speed of the at least one second fan.

In this embodiment, the second fan is disposed around the evaporator and is electrically connected to the external power source through the control unit. When the control unit needs the evaporator to work, the control unit can send a control instruction to the second fan to enable the external power supply to supply power to the second fan. After the second fan rotates, the air around the evaporator flows rapidly, and the evaporator can better absorb the heat in the air around.

In addition, the control unit can also realize changing the superheat degree of the refrigerant by controlling the rotating 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, so that the superheat degree of the refrigerant can be reduced. If the temperature detected by the second temperature sensor is not higher than the set threshold, the rotating speed of the second fan can be increased, and the superheat degree of the refrigerant can be increased.

In one embodiment, the method further comprises: the heating device is connected between an inlet of the compressor and an outlet of the first evaporator through a conduit and is used for heating the refrigerant in the circulating loop; and the control unit is electrically connected with the heating device and is further used for sending 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.

In this embodiment, the refrigerant in the two-phase state is discharged from the outlet of the evaporator, and the refrigerant in the gaseous state is sucked into the compressor. The refrigerant discharged from the evaporator cannot directly flow 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, vaporizes the liquid refrigerant flowing out of the evaporator into gaseous refrigerant, and improves the superheat degree of the refrigerant entering the compressor.

In one embodiment, the heating apparatus includes a regenerator and a first three-way valve, the regenerator includes a first passage and a second passage, the first passage is connected between the condenser and the outlet of the switching valve through a pipe, one end of the second passage is connected to a first end of the first three-way valve through a pipe, the other end of the second passage and a second end of the first three-way valve are connected to the inlet of the compressor through a pipe, and a third end of the first three-way valve is connected to the outlet of the first evaporator through a pipe.

In an embodiment, the control unit is electrically connected to the first three-way valve, and is specifically configured to send a control command to the first three-way valve to increase an opening degree of the first three-way valve and/or allow the first three-way valve to flow in a first direction when the second temperature data is not greater than a set threshold, where the first direction is a direction from a first end of the first three-way valve to a third end of the first three-way valve.

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

In an embodiment, the control unit is electrically connected to the second three-way valve and the at least one third fan, and is specifically configured to send a control command to the second three-way valve to increase a rotation speed of the at least one third fan, increase an opening degree of the second three-way valve, and/or allow the second three-way valve to flow in a second direction when the second temperature data is not greater than a set threshold, where the second direction is a direction from a first end of the second three-way valve to a third end of the second three-way valve.

In one embodiment, the method further comprises: and the oil separator is connected between the outlet of the compressor and the condenser through a guide pipe and is used for separating oil liquid in gaseous refrigerant.

In one embodiment, the method further comprises: and the gas-liquid separator is connected between the inlet of the compressor and the outlet of the first evaporator through a conduit or between the inlet of the compressor and the heating device through a conduit and is used for separating liquid refrigerants.

In one embodiment, the set threshold is between 0 ℃ and 1 ℃.

In this embodiment, the refrigerant in the two-phase state is discharged from the outlet of the evaporator, and the refrigerant in the gaseous state is sucked into the compressor. The refrigerant discharged from the evaporator cannot directly flow 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, and vaporizes the liquid refrigerant flowing out of the evaporator into gaseous refrigerant, so that the superheat degree of the refrigerant entering the compressor is improved.

In a second aspect, an embodiment of the present application provides a control method, which is executed by a control unit in a refrigeration system in each possible implementation of the first aspect, and includes: receiving first temperature data uploaded by a first temperature sensor; judging whether the first temperature data is larger than a set threshold value or not; and when the first temperature data is larger than the set threshold value, sending a first control instruction to at least one of a compressor, an on-off valve and at least one second fan, wherein the first control instruction is used for increasing the rotating speed of a gas pump in the compressor, and/or increasing the opening degree of the on-off valve, and/or reducing the rotating speed of the at least one second fan.

In this embodiment, a temperature sensor is provided at the outlet of the evaporator to monitor the degree of superheat of the refrigerant discharged from the outlet of the evaporator. If the superheat degree detected by the temperature sensor is not larger than the set threshold value, namely the superheat degree is 0 ℃ or close to 0 ℃, the refrigerant flowing through the evaporator is always in a two-phase state. After the two-phase refrigerant absorbs heat, the temperature is basically unchanged or slightly changed, and the situation that all parts in the evaporator are basically the same is ensured. If the superheat degree detected by the temperature sensor is larger than a set threshold value, the refrigerant is converted from a two-phase state into a gaseous state after flowing through the evaporator. The control unit can reduce the superheat degree of the refrigerant in the circulation loop by increasing the rotating speed of the air pump in the compressor, increasing the opening degree of the switch valve and reducing the rotating speed of the fan around the evaporator, so that the refrigerant is always in a two-phase state after flowing through the evaporator, and the temperature of all parts in the evaporator is ensured to be basically the same.

In one embodiment, before said receiving first temperature data uploaded by a first temperature sensor, comprising: receiving second temperature data uploaded by a second temperature sensor; judging whether the second temperature data is larger than the set threshold value or not; and 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, wherein the second control instruction is used for reducing the rotating speed of a gas pump in the compressor, and/or reducing the opening degree of the switch valve, and/or increasing the rotating speed of the at least one second fan, and/or enabling the heating device to heat the refrigerant in the circulation loop.

In this embodiment, the refrigerant discharged from the outlet of the evaporator is generally in a two-phase state, and if a liquid refrigerant enters the compressor, wet compression occurs inside the compressor, which causes the compressor to overflow and unstable operation. In order to avoid the liquid refrigerant from flowing back to the compressor, a temperature sensor is arranged at the air inlet of the compressor, the superheat degree of the refrigerant entering the compressor is monitored, and the monitored result is reported to the control unit. The control unit can reduce the rotating speed of an air pump in the compressor, improve the rotating speed of fans around the evaporator, reduce the opening degree of the switch valve, heat the refrigerant in the circulating loop by the heating device and the like, so that the refrigerant entering the compressor is in a gaseous state, and the safe operation of the compressor is ensured.

In one embodiment, the method further comprises: receiving third temperature data uploaded by a second temperature sensor; judging whether the third temperature data is larger than the set threshold value or not; and when the third temperature data is not greater than the set threshold, sending a third control instruction to the heating device, wherein the third control instruction is used for enabling the heating device to heat the refrigerant in the circulation loop.

In this embodiment, if the refrigerant discharged from the air outlet of the evaporator is in a two-phase state, the temperature sensor reports temperature data again, and the control unit increases the superheat degree of the refrigerant again after receiving the temperature data reported by the temperature sensor. In order to avoid the influence of the refrigerant with the increased temperature on the evaporator again, the superheat degree of the refrigerant entering the evaporator is not increased, and the superheat degree of the refrigerant discharged from the air outlet of the evaporator is increased. The control unit sends a control instruction to the heating device, and the heating device improves the superheat degree of the refrigerant discharged from the air outlet of the evaporator.

In a third aspect, an embodiment of the present application provides an electrical device, including: a housing, at least one heat dissipating component disposed inside the housing; the refrigeration system according to each possible implementation of the first aspect, provided on the enclosure, reduces a temperature of a gas entering an interior of the enclosure by a first evaporator in the refrigeration system. The electric equipment can be understood as an electric automobile, a base station, an outdoor cabinet and the like, and can also be broadly understood as a data center, an office, a workshop and the like.

Drawings

The drawings that accompany the detailed description can be briefly described as follows.

Fig. 1 is a schematic diagram of a refrigeration system provided in the prior art;

FIG. 2 is a schematic structural diagram of a first refrigeration system provided in an embodiment of the present application;

FIG. 3 is a schematic structural view of a second refrigeration system provided in an embodiment of the present application;

FIG. 4 is a schematic diagram of a third refrigeration system provided in an embodiment of the present application;

FIG. 5 is a schematic view of a first exemplary embodiment of a refrigeration system;

fig. 6 is a flowchart of a control method provided in an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In the description of the present application, the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.

In the description of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, a fixed connection, a detachable connection, an interference connection, or an integral connection; the specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Fig. 1 is a schematic structural diagram of a refrigeration system provided in the prior art. As shown in fig. 1, 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.

The compressor compresses refrigerant vapor to obtain high-pressure refrigerant vapor, and drives the high-pressure refrigerant vapor to circulate in the whole loop. The oil separator separates the high-pressure refrigerant steam, separates the lubricating oil in the high-pressure refrigerant steam, and returns the lubricating oil to the compressor. When high-pressure refrigerant steam enters the condenser, the condenser can enable the refrigerant steam to exchange heat with surrounding gas, the temperature of the refrigerant steam is reduced, and the refrigerant steam is converted into liquid from gas. The EEV is used as a switch to control the speed of the liquid refrigerant entering the evaporator. If the opening of the EEV is relatively small, the liquid refrigerant flowing through the EEV is converted into a two-phase refrigerant, i.e., a gas-liquid mixed state. When the two-phase refrigerant enters the evaporator, the evaporator can exchange heat between the two-phase refrigerant and the ambient air, and the temperature of the ambient air of the evaporator is reduced. The gas-liquid separator separates the two-phase refrigerant flowing out of the evaporator to separate the liquid refrigerant and make the gaseous refrigerant flow back to the compressor. The temperature sensor is used for monitoring the superheat degree of a refrigerant flowing out of the evaporator, and the system ensures that the refrigerant sucked by the air inlet of the compressor always has a certain superheat degree by controlling the opening of the EEV, the rotating speed of a fan around the evaporator, the rotating speed of the compressor and the like according to the superheat degree of the refrigerant. The superheat degree is a difference between a current temperature and an evaporation temperature of the refrigerant at the same evaporation pressure in the refrigeration cycle.

However, in the evaporator of the conventional refrigeration system, a microchannel heat exchanger is adopted, and after a two-phase refrigerant enters the microchannel heat exchanger, the refrigerant absorbs heat of air around the microchannel heat exchanger, and the state of the refrigerant is converted from the two-phase state to a gaseous state. After the two-phase refrigerant absorbs heat, the temperature does not change or changes very little. The temperature of the gaseous refrigerant rapidly rises after absorbing heat. The part of the evaporator through which the two-phase refrigerant flows is called a two-phase region; the portion of the evaporator through which the gaseous refrigerant flows is called a superheat region. Since the two-phase region of the evaporator is cooler than the superheat region, the temperatures at various locations on the heat exchanger surfaces are not uniform. When the evaporator exchanges heat with ambient air, the temperature of the air reduced at each position of the heat exchanger is different, so that the temperature of the refrigeration system cannot be accurately controlled.

In order to solve the problems existing in the existing refrigerating system, the refrigerating system is designed. The refrigeration system protected by the embodiment of the application comprises all components or necessary components of the existing refrigeration system, a heating device and a temperature sensor.

The heating device is arranged between the gas-liquid separator and the evaporator and used for heating the refrigerant flowing out of the evaporator, improving the superheat degree of the refrigerant and preventing the liquid refrigerant from entering the compressor. The temperature sensor is arranged at the outlet of the evaporator and used for monitoring the superheat degree of the refrigerant discharged from the outlet of the evaporator and uploading the monitoring result to the control unit. The control unit controls the opening of the EEV, the rotating speed of a fan around the evaporator, the rotating speed of the compressor and the like according to the monitoring result, so that the superheat degree of the refrigerant discharged from the outlet of the evaporator is kept at 0 ℃ or close to 0 ℃. The superheat degree of the refrigerant is 0 ℃, and the refrigerant is in a two-phase state or just in a critical state that the liquid refrigerant disappears. The superheat degree of the refrigerant is close to 0 ℃, which is considered that the superheat degree detected by the temperature sensor may be slightly higher than 0 ℃ due to non-uniform gas-liquid distribution of the refrigerant in a two-phase state. The superheat degree of the refrigerant discharged from the outlet of the evaporator is kept at 0 ℃ or close to 0 ℃, which shows that the state of the refrigerant entering and exiting the evaporator is always in a two-phase state. After the two-phase refrigerant absorbs heat, the temperature does not change, so that the temperature in the whole evaporator can be kept consistent. Preferably, when the superheat degree of the refrigerant is between 0 ℃ and 1 ℃, the refrigerant is considered to be in a two-phase state.

It is contemplated that the evaporator used in the refrigeration system of the present application is not limited to the microchannel heat exchanger described above, and may be other types of heat exchangers, and the present application is only one example and not intended to be limiting.

Fig. 2 is a schematic structural diagram of a first refrigeration system provided in an embodiment of the present application. As shown in fig. 2, the refrigeration system 200 includes a compressor 210, an oil separator 220, a condenser 230, an on-off 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.

The compressor 210, the oil separator 220, the condenser 230, the on-off valve 240, the evaporator 250, and the gas-liquid separator 260 are sequentially connected by a pipe to form a closed loop. The compressor 210 compresses 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 from 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 may exchange heat between the refrigerant vapor and the ambient air to reduce the temperature of the refrigerant vapor, thereby converting the refrigerant vapor from a gaseous state to a liquid state. The on-off valve 240 controls the rate at which liquid refrigerant enters the evaporator 250. If the opening degree of the on-off valve 240 is relatively small, the liquid refrigerant flowing through the on-off valve 240 is converted into a two-phase refrigerant. When the two-phase refrigerant enters the evaporator 250, the evaporator 250 may allow the two-phase refrigerant to exchange heat with the ambient air, thereby reducing the temperature of the ambient air around the evaporator 250. The gas-liquid separator 260 separates the two-phase refrigerant flowing out of the evaporator 250 into a liquid refrigerant, and returns the gaseous refrigerant to the compressor 210.

The control unit 2100 establishes communication connections with the compressor 210, the on-off valve 240, the temperature sensor 270-1, the at least one first fan 280-1, the at least one second fan 280-2, the temperature sensor 270-2, and the heating device 290, respectively, may receive data reported by each component, process the data according to the received data, and issue a control instruction to each component. The control unit 2100 may be a proportional-integral-derivative (PID) control unit, a system on chip (SoC), a Micro Controller Unit (MCU), or other controllers. Preferably, the PID control unit is a unit that forms a control deviation from the given value and the actual output value, and linearly combines the deviation in a proportional, integral and differential manner to obtain a control amount to control the controlled object. The PID control unit has the characteristics of simple algorithm, good robustness, high reliability and the like, and the control unit 2100 of the application is preferably a PID control unit.

The compressor 210 is electrically connected to an external power source through the control unit 2100. When the control unit 2100 needs to operate the compressor 210, it may send a control command to the compressor 210, so that the external power supply supplies power to the compressor 210. The air pump in the compressor 210 may compress the gaseous refrigerant to form high-pressure refrigerant vapor, and drive the high-pressure refrigerant vapor to circulate through the entire loop.

The first fan 280-1 is disposed around the condenser 230 and electrically connected to an external power source through the control unit 2100. When the control unit 2100 requires the condenser 230 to operate, it may send a control command to the first fan 280-1 to allow the external power source to supply power to the first fan 280-1. After the first fan 280-1 rotates, the air around the condenser 230 flows rapidly to take away the heat in the refrigerant inside the condenser 230, thereby increasing the speed of the condenser 230 converting the gaseous refrigerant into the liquid refrigerant. Optionally, the first fan 280-1 establishes a communication connection with the control unit 2100. If the cooling effect of the condenser 230 is not good, the circulation speed of the cooling medium in the loop is high, and the like, the control unit 2100 may send a control command to the first fan 280-1 to increase the rotation speed of the first fan 280-1, so as to increase the cooling speed of the condenser 230. If the condenser 230 has a good cooling effect on the refrigerant, and the refrigerant circulates in the loop at a low speed, the control unit 2100 may send a control command to the first fan 280-1 to reduce the rotational speed of the first fan 280-1, thereby reducing the energy consumption of the refrigeration system.

The second fan 280-2 is disposed around the evaporator 250 and electrically connected to an external power source through the control unit 2100. When the evaporator 250 is required to operate, the control unit 2100 may send a control command to the second fan 280-2 to enable the external power source to supply power to the second fan 280-2. The second fan 280-2 rotates to allow the ambient air around the evaporator 250 to flow rapidly, so that the evaporator 250 can absorb heat from the ambient air better.

The switching valve 240 is connected between the condenser 230 and the evaporator 250 through a conduit, and is electrically connected with the control unit 2100. The control unit 2100 controls the opening degree of the open/close valve 240 by sending a control command to the open/close valve 240. Typically, the refrigerant is in a gaseous state. When the liquid refrigerant passes through the on-off valve 240, if the opening degree of the on-off valve 240 is relatively small, the pressure of the liquid refrigerant is instantaneously reduced after the liquid refrigerant enters the conduit between the on-off valve 240 and the evaporator 250, and all or most of the liquid refrigerant is converted into the gaseous refrigerant. If the opening degree of the on-off valve 240 is relatively large, the pressure change is relatively small after the liquid refrigerant enters the conduit between the on-off valve 240 and the evaporator 250, and a small amount or no liquid refrigerant is converted into a gaseous refrigerant. Therefore, the control unit 2100 may control the ratio of the gaseous refrigerant to the liquid refrigerant entering the evaporator 250 by controlling the opening degree of the on-off valve 240. The on-off valve 240 is preferably an EEV, but may be another type of on-off valve, and the application is not limited thereto.

The compressor 210 generally includes an air pump and an air tank. When the air pump compresses the gaseous refrigerant, if a liquid refrigerant enters the compressor 210, wet compression occurs inside the compressor 210, which causes the compressor 210 to overflow and unstable operation. In order to avoid the liquid refrigerant from flowing back to the compressor 210, a gas-liquid separator 260 is generally connected to an inlet of the compressor 210. The gas-liquid separator 260 separates the refrigerant flowing out of the evaporator 250 into a liquid refrigerant, and returns the gaseous refrigerant to the compressor 210.

However, the conventional gas-liquid separator 260 is difficult to achieve complete gas-liquid separation, and therefore, the present application provides a temperature sensor 270-1 at the air inlet of the compressor 210. The temperature sensor 270-1 may be inserted into a conduit between the compressor 210 and the gas-liquid separator 260, or placed at an inlet of the compressor 210, or disposed at an outlet of the gas-liquid separator 260. The temperature sensor 270-1 is used to monitor the superheat degree of the refrigerant entering the compressor 210, and report the monitored result to the control unit 2100. After receiving the result reported by the temperature sensor 270-1, the control unit 2100 determines whether the degree of superheat monitored by the temperature sensor 270-1 is greater than a set threshold. When the degree of superheat monitored by the temperature sensor 270-1 is greater than a set threshold, it is indicated that the state of the refrigerant entering the compressor 210 is a gaseous state. The control unit 2100 discards the data reported this time, or does not perform the next operation. When the superheat degree monitored 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 a two-phase state. If the two-phase refrigerant enters the compressor 210, wet compression occurs inside the compressor 210, which may cause an over-current of the compressor 210 and unstable operation. Therefore, the control unit 2100 needs to increase the degree of superheat of the refrigerant entering the compressor 210.

In one possible embodiment, the control unit 2100 sends a control command to the compressor 210 to rotate the air pump in the compressor 210 to reduce the pressure of the refrigerant pumped by the compressor 210. Under other conditions, the compressor 210 pumps the refrigerant with a lower pressure, so that the ratio of the refrigerant in the liquid state entering the evaporator 250 is reduced. At this time, the proportion of the liquid refrigerant in the refrigerant output from the evaporator 250 is also reduced, and the degree of superheat of the refrigerant entering the compressor 210 is increased.

In one possible embodiment, the control unit 2100 sends a control command to the second fan 280-2 to increase the rotation speed of the second fan 280-2 and increase the heat absorption speed of the refrigerant in the evaporator 250. Under the condition that other conditions are not changed, after the evaporator 250 increases the speed of the refrigerant absorbing heat, the proportion of the liquid refrigerant in the refrigerant output by the evaporator 250 is reduced, and the superheat degree of the refrigerant entering the compressor 210 is increased.

In one possible embodiment, the control unit 2100 sends a control command to the on-off valve 240 to decrease the opening degree of the on-off valve 240. When the opening degree of the on-off valve 240 is decreased under other conditions, the ratio of the liquid refrigerant to the refrigerant introduced into the evaporator 250 is decreased. At this time, the proportion of the liquid refrigerant in the refrigerant output from the evaporator 250 is also reduced, and the degree of superheat of the refrigerant entering the compressor 210 is increased.

In one possible embodiment, the control unit 2100 sends a control command to the heating device 290 to enable the heating device 290 to start heating. The heating device 290 vaporizes the liquid refrigerant flowing out of the evaporator 250 into a gaseous refrigerant by heating the pipe between the evaporator 250 and the gas-liquid separator 260 or the gas-liquid separator 260, thereby increasing the degree of superheat of the refrigerant entering the compressor 210.

The control unit 2100 may not only achieve the improvement of the superheat degree of the refrigerant entering the compressor 210 by using the above-mentioned several possible embodiments, but also achieve the improvement of the superheat degree of the refrigerant entering the compressor 210 by using two or more manners in the above-mentioned several possible embodiments, which is not limited herein.

In order to realize the same temperature at each position inside the evaporator 250, the refrigerant entering the evaporator 250 is always in a two-phase state. After entering the evaporator 250, the refrigerant absorbs heat from the ambient air around the evaporator 250, and vaporizes the liquid refrigerant into a gaseous refrigerant. If the refrigerant discharged from the outlet of the evaporator 250 is still in the two-phase state, it can be verified that the refrigerant inside the evaporator 250 is always in the two-phase state. Accordingly, the present application provides a temperature sensor 270-2 at the air inlet of the evaporator 250.

The temperature sensor 270-2 may be inserted into a conduit near the outlet of the evaporator 250 or placed at the outlet of the evaporator 250. The temperature sensor 270-2 is configured to monitor a degree of superheat of the refrigerant discharged from the air outlet of the evaporator 250, and report a 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 degree monitored by the temperature sensor 270-2 is greater than a set threshold, where the set threshold may be between 0 ℃ and 1 ℃. When the degree of superheat monitored by the temperature sensor 270-2 is not greater than the set threshold, it is indicated that the state of the refrigerant discharged from the 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 operation. When the degree of superheat monitored by the temperature sensor 270-2 is greater than a set threshold, it is indicated 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 outlet of the evaporator 250 is in a two-phase state or in a critical state where the refrigerant in a liquid state disappears.

In one possible embodiment, the control unit 2100 sends a control command to the compressor 210 to increase the rotation speed of the air pump in the compressor 210, so as to increase the pressure of the refrigerant pumped by the compressor 210. Under other conditions, the compressor 210 pumps the refrigerant with higher pressure, so that the ratio of the liquid refrigerant in the refrigerant entering the evaporator 250 is increased. At this time, the proportion of the liquid refrigerant in the refrigerant output from the evaporator 250 is also increased, thereby reducing the superheat degree of the refrigerant discharged from the air outlet of the evaporator 250 and making the superheat degree of the refrigerant at 0 ℃ or close to 0 ℃.

In one possible embodiment, the control unit 2100 sends a control command to the second fan 280-2 to reduce the rotation speed of the second fan 280-2 and reduce the heat absorption speed of the refrigerant in the evaporator 250. Under the condition that other conditions are not changed, after the evaporator 250 reduces the speed of the refrigerant for absorbing heat, the proportion of the liquid refrigerant in the refrigerant output by the evaporator 250 is increased, so that the superheat degree of the refrigerant discharged from the air outlet of the evaporator 250 is reduced, and the superheat degree of the refrigerant is at 0 ℃ or close to 0 ℃.

In one possible embodiment, the control unit 2100 sends a control command to the second fan 280-2 to increase the opening degree of the on-off valve 240. Under other conditions, when the opening degree of the on-off valve 240 is increased, the ratio of the liquid refrigerant to the refrigerant entering the evaporator 250 is increased. At this time, the proportion of the liquid refrigerant in the refrigerant output from the evaporator 250 is also increased, thereby reducing the superheat degree of the refrigerant discharged from the air outlet of the evaporator 250 and making the superheat degree of the refrigerant at 0 ℃ or close to 0 ℃.

The control unit 2100 may not only reduce the superheat degree of the refrigerant discharged from the outlet of the evaporator 250 by using the above-mentioned several possible embodiments, but also reduce the superheat degree of the refrigerant discharged from the outlet of the evaporator 250 by using two or more of the above-mentioned several possible embodiments, which is not limited herein.

In this application, the refrigerant discharged from the outlet of the evaporator 250 is in a two-phase state, and the refrigerant sucked from the 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, and as the operation time of the refrigeration system 200 increases, it is difficult for the gas-liquid separator 260 to completely separate the liquid refrigerant of the two-phase refrigerant. Therefore, a heating device 290 is disposed between the evaporator 250 and the compressor 210 to convert the two-phase refrigerant discharged from the evaporator 250 into a gaseous refrigerant, and then the gaseous refrigerant flows into the compressor 210.

As shown in fig. 2, the heating device 290 may be a heater disposed around the gas-liquid separator 260 or on a conduit between the evaporator 250 and the compressor 210 for converting the two-phase refrigerant discharged from the evaporator 250 into a gaseous refrigerant. The heating device 290 is electrically connected to an external power source 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 operate according to the detection results, and controls the heating device 290 to heat at a set power according to the superheat value of the refrigerant. In this embodiment, a heater, which is a common heater in daily life, is used as the heating device, so that the manufacturing cost of the refrigeration system 200 can be reduced. The heating device increases the superheat degree of the refrigerant by converting electric energy into heat energy, which causes the energy in the refrigeration system to rise and is not beneficial to the refrigeration effect of the refrigeration system. Therefore, the control unit 2100 may start the heater to heat the refrigerant only when the effect of increasing the degree of superheat of the refrigerant is not good by controlling the compressor 210, the second fan 280-2, the on-off valve 240, and the like.

As shown in fig. 3, heating device 290 includes a regenerator 291 including a first passage and a second passage, and a three-way valve 292. A first passage in the regenerator 291 is connected between the condenser 230 and the switching valve 240. A second passage in the regenerator 291 is connected in series with a three-way valve 292, which is then connected between the evaporator 250 and the gas-liquid separator 260. A three-way valve 292 is connected to an end of the regenerator 291 near the evaporator 250. A third end of the three-way valve 292 is connected to an end of the regenerator 291 near the gas-liquid separator 260 by a conduit. The three-way valve 292 is electrically connected to the control unit 2100. The control unit 2100 sends a control command to the three-way valve 292 to control the opening degree of the three-way valve 292 and the flow direction of the three-way valve 292.

Generally, the temperature of the refrigerant discharged from the outlet of the condenser 230 is about 35 to 50 ℃, and the temperature of the refrigerant discharged from the outlet of the evaporator 250 is about 10 to 18 ℃, that is, the superheat degree is about 0 ℃. If the control unit 2100 detects that the superheat is 0 ℃ or nearly 0 ℃ based on 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 command to the three-way valve 292, so that the three-way valve 292 opens the path through which the refrigerant flows into the first channel of the heat regenerator 291, and closes the path through which the refrigerant directly flows into the gas-liquid separator 260 bypassing the heat regenerator 291.

When the refrigerant discharged from the outlet of the condenser 230 enters the first channel of the heat regenerator 291, the refrigerant discharged from the outlet of the evaporator 250 enters the second channel of the heat regenerator 291, and the two channels of the heat regenerator 291 exchange heat, so as to reduce the temperature of the refrigerant in the first channel and increase the temperature of the refrigerant in the second channel. This application passes through heat regenerator 291, with in the refrigerant of condenser 230 export exhaust heat transfer to the refrigerant of evaporimeter 250 export exhaust, the realization is converted into gaseous refrigerant with the refrigerant of the two-phase state of evaporimeter 250 exhaust.

If the control unit 2100 detects that the superheat degree is 0 ℃ or close to 0 ℃ according to the temperature sensor 270-2, that is, the state of the refrigerant discharged from the outlet of the evaporator 250 is a two-phase state, and the liquid refrigerant has a high ratio. At this time, the control unit 2100 sends a control command to the three-way valve 292, so that the three-way valve 292 opens the path through which the refrigerant flows into the first channel of the heat regenerator 291, and closes the path through which the refrigerant directly flows into the gas-liquid separator 260 bypassing the heat regenerator 291. The opening degree of the three-way valve 292 is decreased, and the degree of superheat of the refrigerant is further increased.

If the control unit 2100 detects that the degree of superheat is more than 0 c based on the temperature sensor 270-2, that is, the state of the refrigerant discharged from the outlet of the evaporator 250 is gaseous. At this time, the control unit 2100 sends a control command to the three-way valve 292, so that the three-way valve 292 closes the path through which the refrigerant flows into the first channel of the heat regenerator 291, and opens the path through which the refrigerant directly flows into the gas-liquid separator 260 bypassing the heat regenerator 291. At this time, the refrigerant discharged from the evaporator 250 directly flows into the gas-liquid separator 260 through the three-way valve 292.

In this embodiment, the heating device 290 includes a heat regenerator, and the refrigerant discharged from the outlet of the condenser 230 exchanges heat with the refrigerant discharged from the outlet of the evaporator 250, so as to convert the two-phase refrigerant discharged from the evaporator 250 into a gaseous refrigerant. The refrigeration system of this embodiment has a lower energy consumption compared to the refrigeration system of fig. 2.

As shown in fig. 4, the heating device 290 includes a sub-evaporator 293, a three-way valve 294, and at least one third fan 295. The sub-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 one end of the regenerator 291 near the evaporator 250. A third end of the three-way valve 294 is connected to an end of the sub-evaporator 293 near the gas-liquid separator 260 through a pipe. The three-way valve 294 is electrically connected with the control unit 2100. The control unit 2100 sends a control command to the three-way valve 294 to control the opening degree of the three-way valve 294 and the flow direction of the three-way valve 294.

The third fan 295 is disposed around the sub-evaporator 293 and electrically connected to an external power source through the control unit 2100. When the control unit 2100 needs the sub-evaporator 293 to operate, it may send a control command to the third fan 295 to allow the external power source to supply power to the third fan 295. After the third fan 295 rotates, the ambient air in the sub-evaporator 293 flows rapidly, so that the sub-evaporator 293 absorbs heat from the ambient air better, and the two-phase refrigerant is converted into a gaseous refrigerant.

If the control unit 2100 detects that the degree of superheat is 0 deg.c according to the temperature sensor 270-2, 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 command to the three-way valve 294, so that the three-way valve 294 opens a passage through which the refrigerant flows into the sub-evaporator 293 and closes a passage through which the refrigerant directly flows into the gas-liquid separator 260 while bypassing the sub-evaporator 293. The control unit 2100 sends a control command to the third fan 295 to rotate the third fan 295, so that heat in the air around the sub-evaporator 293 is transferred to the refrigerant in the sub-evaporator 293, and the two-phase refrigerant is converted into a gaseous refrigerant.

If the control unit 2100 detects that the superheat degree is close to 0 ℃ according to the temperature sensor 270-2, that is, the state of the refrigerant discharged from the outlet of the evaporator 250 is a two-phase state, and the liquid refrigerant has a high ratio. At this time, the control unit 2100 sends a control command to the three-way valve 294, causing the three-way valve 294 to open a passage through which the refrigerant flows into the sub-evaporator 293 and close a passage through which the refrigerant directly flows into the gas-liquid separator 260 while bypassing the sub-evaporator 293. The opening degree of the three-way valve 294 is decreased, and the degree of superheat of the refrigerant is further increased.

If the control unit 2100 detects that the degree of superheat is greater than 0 c based on the temperature sensor 270-2, that is, the state of the refrigerant discharged from the outlet of the evaporator 250 is in a gaseous state. At this time, the control unit 2100 sends a control command to the three-way valve 294 to close the passage through which the refrigerant flows into the sub-evaporator 293 and open the passage through which the refrigerant flows into the gas-liquid separator 260 while bypassing the sub-evaporator 293. At this time, the refrigerant discharged from the evaporator 250 directly flows into the gas-liquid separator 260 through the three-way valve 294.

In this embodiment, the heating device 290 includes an auxiliary evaporator 293 and a third fan 295, and the refrigerant discharged from the outlet of the condenser 230 exchanges heat with the ambient air of the auxiliary evaporator 293 through the auxiliary 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 air around the sub-evaporator 293 to the other heat dissipating components in the refrigeration system, such as the compressor 210, so as to reduce the temperature of the other heat dissipating components in the refrigeration system. Alternatively, the heating device 290 of fig. 4 may be connected between the on-off valve 240 and the evaporator 250 in the same manner as that of fig. 5.

Fig. 5 is a schematic view of an application scenario of a first refrigeration system provided in an embodiment of the present application. As shown in fig. 5, the scenario includes a refrigeration system 200 and a space 300 requiring cooling. The space 300 may be a member compartment in an electric vehicle, a space in a data center where heat dissipation components are stored, and the like. The space 300 is provided with a passage in which the evaporator 250 of the refrigeration system 200 can be installed or installed in the space 300. A second fan 280-2 is mounted at the air inlet of the channel. When the refrigeration system 200 is normally operated, the second fan 280-2 blows gas outside the space 300 into the passage. The gas in the channel exchanges heat with the refrigerant in the evaporator 250, and the heat in the gas is transferred to the refrigerant, thereby reducing 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.

The embodiment of the present application provides an electric device, which includes a heat dissipation component and a refrigeration system as described in fig. 1 to 5 and the corresponding protection schemes described above. The heat dissipation member is disposed in a relatively closed space inside the electric device, in which the evaporator in the refrigeration system is located. When the refrigerating system normally works, the fan blows external gas into the electric equipment through the evaporator, and the temperature in the electric equipment is reduced. Since the electric device includes the refrigeration system, the electric device has all or part of the advantages of the refrigeration system. The electric equipment can be understood as an electric automobile, a base station, an outdoor cabinet and the like, and can also be broadly understood as a data center, an office, a workshop and the like.

Fig. 6 is a flowchart of a control method provided in an embodiment of the present application. As shown in fig. 6, the control method may be executed by the control unit 2100 mentioned above, and specifically executed as follows:

step S601, receiving first temperature data uploaded by the first temperature sensor. The first temperature sensor is referred to as temperature sensor 270-2.

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

Step S603, when the first temperature data is greater than the set threshold, sending a first control command to at least one of the compressor, the on-off valve, and the at least one second fan. Wherein the first control instruction is used for increasing the rotating speed of the air pump in the compressor, and/or increasing the opening degree of the switch valve, and/or reducing the rotating speed of at least one second fan.

In conjunction with the refrigeration system 200 shown in fig. 2-5, 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 outlet of the evaporator 250 is still in the two-phase state, it can be verified that the refrigerant inside the evaporator 250 is always in the two-phase state. A temperature sensor 270-2 is provided at the air inlet of the evaporator 250. The temperature sensor 270-2 may be inserted into a conduit near the outlet of the evaporator 250 or placed at the outlet of the evaporator 250. The temperature sensor 270-2 is configured to monitor a degree of superheat of the refrigerant discharged from the air outlet of the evaporator 250, and report a 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 degree monitored by the temperature sensor 270-2 is greater than a set threshold, where the set threshold may be between 0 ℃ and 1 ℃. When the degree of superheat monitored by the temperature sensor 270-2 is not greater than the set threshold, it is indicated that the state of the refrigerant discharged from the 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 operation. When the degree of superheat monitored by the temperature sensor 270-2 is greater than a set threshold, it is indicated 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 outlet of the evaporator 250 is in a two-phase state or in a critical state where the refrigerant in a liquid state disappears.

The control unit 2100 may reduce the superheat of the refrigerant entering the evaporator 250 in many ways, such as increasing the rotation speed of the air pump in the compressor 210, reducing the rotation speed of the second fan 280-2, increasing the opening degree of the on-off valve 240, and the like, which is not limited herein.

The refrigerant discharged from the outlet of the evaporator 250 is generally in a two-phase state, and if a liquid refrigerant enters the compressor 210, wet compression occurs inside the compressor 210, which causes an over-current of the compressor 210 and an unstable operation of the compressor. To prevent the liquid refrigerant from flowing back into the compressor 210, a temperature sensor 270-1 is disposed at an air inlet of the compressor 210. The temperature sensor 270-1 may be inserted into a conduit between the compressor 210 and the gas-liquid separator 260, or placed at an inlet of the compressor 210, or disposed at an outlet of the gas-liquid separator 260. The temperature sensor 270-1 is used to monitor the superheat degree of the refrigerant entering the compressor 210, and report the monitored result to the control unit 2100.

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, which is implemented as follows:

step S601A, receiving second temperature data uploaded by the second temperature sensor. The second temperature sensor is referred to as temperature sensor 270-1.

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

step S601C, when the second temperature data is not greater than the set threshold, sending a second control command to at least one of the compressor, the on-off valve, the at least one second fan, and the heating device. The second control instruction is used for reducing the rotating speed of a gas pump in the compressor, and/or reducing the opening degree of the switch valve, and/or increasing the rotating speed of at least one second fan, and/or enabling the heating device to heat the refrigerant in the circulation loop.

With reference to the refrigeration systems 200 shown in fig. 2 to 5, after receiving the result reported by the temperature sensor 270-1, the control unit 2100 determines whether the degree of superheat monitored by the temperature sensor 270-1 is greater than a set threshold. When the degree of superheat monitored by the temperature sensor 270-1 is greater than a set threshold, it is indicated that the state of the refrigerant entering the compressor 210 is a gaseous state. The control unit 2100 discards the data reported this time, or does not perform the next operation. When the superheat degree monitored by the temperature sensor 270-1 is not greater than the set threshold value, it is indicated that the state of the refrigerant entering the compressor 210 is a two-phase state. The control unit 2100 needs to increase the superheat degree of the refrigerant introduced into the compressor 210.

The control unit 2100 may increase the superheat of the refrigerant entering the compressor 210 by reducing the rotation speed of the air pump in the compressor 210, increasing the rotation speed of the second fan 280-2, reducing the opening degree of the on-off valve 240, and heating the refrigerant in the circulation circuit by the heating device 290, which is not limited herein.

After the control unit 2100 performs 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 reports temperature data again, and after receiving the temperature data reported by the temperature sensor 270-1, the control unit 2100 increases the superheat degree of the refrigerant again. In order to avoid the influence of the refrigerant with the increased temperature on the evaporator 250 again, the superheat degree of the refrigerant entering the evaporator 250 is not increased, and the superheat degree of the refrigerant discharged from the gas outlet of the evaporator 250 is increased. The control unit 2100 sends a control command to the heating device 290 to make the heating device 290 increase the superheat degree of the refrigerant discharged from the outlet of the evaporator 250.

Therefore, after the control unit 2100 performs step S603, optionally, the state of the refrigerant entering the compressor 210 needs to be monitored again by the temperature sensor 270-1, which is implemented as follows:

step S604, receiving third temperature data uploaded by the second temperature sensor.

In step S605, it is determined whether the third temperature data is greater than a set threshold.

And step S606, when the third temperature data is not larger than the set threshold, sending a third control command to the heating device. The third control instruction is used for enabling the heating device to heat the refrigerant in the circulation loop.

In one example of implementation, as shown in fig. 2, the heating device 290 is electrically connected to an external power source through the control unit 2100. The control unit 2100 receives the temperature data reported by the temperature sensor 270-1, determines that the superheat degree value of the refrigerant is increased, and then sends a control instruction to the heating device 290. After receiving the control command, the heating device 290 is connected to an external power source, and then heats the refrigerant according to a set power.

In one example of implementation, as shown in fig. 3, the control unit 2100 is electrically connected to the three-way valve 292. The control unit 2100 receives the temperature data reported by the temperature sensor 270-1, determines that the superheat degree value of the refrigerant is increased, and then sends a control instruction to the three-way valve 292. The control unit 2100 increases the degree of superheat of the refrigerant by controlling the opening degree 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 the second passage where the refrigerant enters the heat regenerator 291 from the evaporator 250, the degree of opening of the three-way valve 292 may be reduced to increase the degree of superheat of the refrigerant. For another example, when the flow direction of the three-way valve 292 is such that the refrigerant enters the gas-liquid separator 260 from the evaporator 250, the opening degree of the three-way valve 292 may be decreased to increase the superheat degree of the refrigerant.

In one example of implementation, as shown in fig. 4, the control unit 2100 is electrically connected to the three-way valve 294 and the third fan 295, respectively. The control unit 2100 receives the temperature data reported by the temperature sensor 270-1, determines that the superheat degree value of the refrigerant is increased, and then sends a control instruction to the three-way valve 294 and the third fan 295. The control unit 2100 increases the degree of superheat of the refrigerant by controlling the opening degree of the three-way valve 294, the flow direction of the three-way valve 295, and the rotation speed of the third fan 295. For example, when the refrigerant flows through the three-way valve 294 from the evaporator 250 to the evaporator 293, the degree of opening of the three-way valve 294 may be decreased and the rotational speed of the third fan 295 may be increased to increase the degree of superheat of the refrigerant. For another example, when the refrigerant enters the gas-liquid separator 260 from the evaporator 250 in the flow direction of the three-way valve 294, the degree of opening of the three-way valve 294 may be reduced, thereby increasing the degree of superheat of the refrigerant.

Also provided in an embodiment of the present application is a computer-readable storage medium having a computer program stored thereon, where the computer program is used to make a computer execute any one of the methods described in the above-mentioned fig. 6 and the corresponding description when the computer program is executed in the computer.

Also provided in an embodiment of the present application is a computer program product having instructions stored thereon, which when executed by a computer, cause the computer to implement any one of the methods set forth above in fig. 6 and the corresponding description.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.

The above description is only a specific implementation of the embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the embodiments of the present application, and all the changes or substitutions should be covered by the scope of the embodiments of the present application.

Claims

1. A refrigeration system, comprising: a compressor, a condenser, a switch valve, a first evaporator, a first temperature sensor and a control unit,

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 for detecting the superheat degree of the refrigerant discharged from the outlet of the first evaporator;

the control unit is respectively electrically connected with the compressor, the switch valve and the first temperature sensor, and is used for receiving first temperature data uploaded by the first temperature sensor and judging whether the first temperature data is greater than a set threshold value; and when the first temperature data is larger than a set threshold value, sending a control instruction to the compressor and/or the switch valve, and increasing the rotating speed of the air pump in the compressor and/or increasing the opening degree of the switch valve.

2. The refrigerant system as set forth in claim 1, further including:

the second temperature sensor is embedded in the inlet of the compressor and used for detecting the superheat degree of the refrigerant sucked by the inlet of the compressor;

the control unit is electrically connected with the second temperature sensor and is also used for receiving second temperature data uploaded by the second temperature sensor and judging whether the second temperature data is greater than a set threshold value or not; and when the second temperature data is not greater than a set threshold value, sending a control instruction to the compressor and/or the switch valve, and reducing the rotating speed of the air pump in the compressor and/or reducing the opening of the switch valve.

3. The refrigeration system according to any one of claims 1 or 2, further comprising:

at least one second fan disposed around the first evaporator for reducing a temperature of the first evaporator;

the control unit is electrically connected with the at least one second fan and is further used for controlling an instruction to the at least one first fan to reduce the rotating speed of the at least one second fan when the first temperature data is greater than a set threshold value; and/or

And when the second temperature data is not greater than a set threshold value, giving a control instruction to the at least one first fan to increase the rotating speed of the at least one second fan.

4. A refrigeration system as recited in any one of claims 1 to 3 further comprising:

the heating device is connected between an inlet of the compressor and an outlet of the first evaporator through a conduit and is used for heating the refrigerant in the circulating loop;

and the control unit is electrically connected with the heating device and is further used for sending 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.

5. The refrigeration system of claim 4, wherein the heating device comprises a regenerator and a first three-way valve,

the heat regenerator comprises 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.

6. The refrigeration system of claim 5, wherein the control unit is electrically connected to the first three-way valve, and is specifically configured to send a control command to the first three-way valve to increase an opening degree of the first three-way valve and/or to allow the first three-way valve to flow in a first direction from a first end of the first three-way valve to a third end of the first three-way valve when the second temperature data is not greater than a set threshold.

7. The refrigerating system as recited in claim 5 wherein said heating means comprises a second evaporator, one end of which is connected to a first end of said second three-way valve through a conduit, the other end of said second evaporator and a second end of said second three-way valve are connected to an inlet of said compressor through a conduit, and a third end of said second three-way valve is connected to an outlet of said first evaporator through a conduit; the at least one third fan is disposed around the second evaporator.

8. The refrigeration system of claim 7, wherein the control unit is electrically connected to the second three-way valve and the at least one third fan, and is specifically configured to send a control command to the second three-way valve to increase a rotation speed of the at least one third fan, increase an opening degree of the second three-way valve, and/or allow the second three-way valve to flow in a second direction from a first end of the second three-way valve to a third end of the second three-way valve when the second temperature data is not greater than a set threshold.

9. The refrigeration system according to any one of claims 1 to 8, further comprising:

and the oil separator is connected between the outlet of the compressor and the condenser through a guide pipe and is used for separating oil liquid in gaseous refrigerant.

10. The refrigeration system according to any one of claims 1 to 9, further comprising:

and the gas-liquid separator is connected between the inlet of the compressor and the outlet of the first evaporator through a conduit or between the inlet of the compressor and the heating device through a conduit and is used for separating liquid refrigerants.

11. A refrigeration system according to any of claims 1-10, wherein the set threshold is between 0 ℃ and 1 ℃.

12. A control method, characterized in that the method is performed by a control unit according to claims 1-11, comprising:

receiving first temperature data uploaded by a first temperature sensor;

judging whether the first temperature data is larger than a set threshold value or not;

and when the first temperature data is larger than the set threshold value, 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 for increasing the rotating speed of a gas pump in the compressor, and/or increasing the opening degree of the switch valve, and/or reducing the rotating speed of the at least one second fan.

13. The method of claim 12, prior to said receiving first temperature data uploaded by a first temperature sensor, comprising:

receiving second temperature data uploaded by a second temperature sensor;

judging whether the second temperature data is larger than the set threshold value or not;

and 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, wherein the second control instruction is used for reducing the rotating speed of a gas pump in the compressor, and/or reducing the opening degree of the switch valve, and/or increasing the rotating speed of the at least one second fan, and/or enabling the heating device to heat the refrigerant in the circulation loop.

14. The method of claim 12 or 13, further comprising:

receiving third temperature data uploaded by a second temperature sensor;

judging whether the third temperature data is larger than the set threshold value or not;

and when the third temperature data is not greater than the set threshold, sending a third control instruction to the heating device, wherein the third control instruction is used for enabling the heating device to heat the refrigerant in the circulation loop.

15. An electrical device, comprising:

the outer shell is provided with a plurality of grooves,

at least one heat dissipating member disposed inside the housing;

the refrigeration system of claims 1-11, disposed on the enclosure, wherein a temperature of a gas entering an interior of the enclosure is reduced by a first evaporator in the refrigeration system.