A refrigerating device for high protection grade aircraft ground static power supply

Abstract

This utility model provides a cooling device for a high-protection-level aircraft ground static power supply, relating to the field of aircraft ground static power supply cooling technology. The static power supply internally houses a transformer, a reactor, and a power module. The device includes an external condenser piping system and an internal condenser piping system. The internal condenser piping system includes a first internal condenser piping system for cooling the transformer, a second internal condenser piping system for cooling the reactor, and a third internal condenser piping system for cooling the power module. The outlets of the first, second, and third internal condenser piping systems are all connected to the inlet of the external condenser piping system, and the outlet of the external condenser piping system is connected to the inlet of each of the three internal condenser piping systems. This device achieves rapid heat dissipation through a refrigerant phase change cycle, resulting in high heat transfer efficiency and excellent heat dissipation performance.

Description

Technical Field

[0001] This utility model relates to the field of aircraft ground static variable power supply cooling technology, and more specifically, to a cooling device for a high-protection-level aircraft ground static variable power supply. Background Technology

[0002] Currently, the main cooling methods for high-power devices in aircraft ground static power supplies are natural heat dissipation, forced air cooling, and liquid cooling.

[0003] Natural heat dissipation dissipates heat through natural convection between the outer casing and the air. Its advantages are simple structure, small overall size, and low cost. However, the overall heat dissipation effect is poor, and it is only suitable for some small or low-power static power supplies.

[0004] Forced air cooling uses a fan to remove heat. Static transformers have ventilation windows on their casing, and the fan accelerates airflow to improve heat dissipation efficiency. This cooling method is simple and economical, and its heat dissipation effect is better than natural heat dissipation. However, it is greatly affected by factors such as ambient temperature and humidity, and it affects the overall protection rating, making it lower than IP55. Furthermore, there is a risk of water ingress through the louvers. Currently, most static transformers still use forced air cooling with fans for heat dissipation.

[0005] Liquid cooling involves direct contact between the heat-generating device and a cold plate filled with liquid. Heat is transferred through the cold plate to the liquid inside, and the heat is carried away by the liquid circulation. Its advantage is that the heat dissipation effect is better than air cooling, but there is a risk of leakage. In addition, for high-power devices, large-capacity water pumps and other devices are required to meet the heat dissipation requirements. Utility Model Content

[0006] An embodiment of this utility model provides a cooling device for a high-protection-level aircraft ground static power supply, so as to achieve cooling and heat dissipation of high-power devices in the static power supply.

[0007] Other features and advantages of this invention will become apparent from the following detailed description, or may be learned in part by practice of this invention.

[0008] According to a first aspect of the present invention, a cooling device for a high-protection-level aircraft ground static variable power supply is provided, wherein the static variable power supply internally includes a transformer, a reactor, and a power module, comprising:

[0009] External condenser piping and internal condenser piping assembly;

[0010] The cabinet condenser piping group includes a first cabinet condenser piping for cooling the transformer, a second cabinet condenser piping for cooling the reactor, and a third cabinet condenser piping for cooling the power module.

[0011] The outlets of the first cabinet internal condenser pipe, the second cabinet internal condenser pipe, and the third cabinet internal condenser pipe are all connected to the inlet of the external condenser pipe, and the outlet of the external condenser pipe is connected to the inlet of the first cabinet internal condenser pipe, the second cabinet internal condenser pipe, and the third cabinet internal condenser pipe, respectively.

[0012] In some embodiments of this utility model, based on the foregoing scheme, the external condenser piping includes: a compressor, a condenser, and a dryer connected in sequence;

[0013] The compressor inlet is also connected to the outlets of the condenser pipes in the first cabinet, the second cabinet, and the third cabinet.

[0014] The outlet of the dryer is also connected to the inlet of the condenser pipes in the first cabinet, the second cabinet, and the third cabinet.

[0015] In some embodiments of this utility model, based on the aforementioned scheme, the condensation pipeline inside the first cabinet includes: a first electronic expansion valve, a first evaporating copper tube inlet pipe, a transformer cold plate, and a first evaporating copper tube outlet pipe connected in sequence;

[0016] The inlet of the first electronic expansion valve is connected to the outlet of the dryer, the transformer cold plate is mounted on the transformer, and the outlet of the first evaporating copper tube is connected to the inlet of the compressor.

[0017] In some embodiments of this utility model, based on the aforementioned scheme, the condenser piping inside the second cabinet includes: a second electronic expansion valve, a second evaporator copper tube inlet pipe, a reactor cold plate, and a second evaporator copper tube outlet pipe connected in sequence;

[0018] The inlet of the second electronic expansion valve is connected to the outlet of the dryer, the reactor cold plate is mounted on the reactor, and the outlet of the second evaporating copper tube is connected to the inlet of the compressor.

[0019] In some embodiments of this utility model, based on the aforementioned scheme, the condensation pipeline inside the third cabinet includes: a third electronic expansion valve, a third evaporation copper tube inlet pipe, a power module cold plate, and a third evaporation copper tube outlet pipe connected in sequence;

[0020] The inlet of the third electronic expansion valve is connected to the outlet of the dryer, the power module cold plate is mounted on the power module, and the outlet of the third evaporating copper tube is connected to the inlet of the compressor.

[0021] In some embodiments of this utility model, based on the aforementioned scheme, a first evaporation branch pipe and a second evaporation branch pipe are provided between the inlet of the compressor and the outlet of the first evaporation copper tube outlet pipe, the outlet of the second evaporation copper tube outlet pipe and the outlet of the third evaporation copper tube outlet pipe.

[0022] The outlets of the first and second evaporating copper tubes are respectively connected to the two inlets of the first evaporating branch pipe, the outlet of the first evaporating branch pipe is connected to one inlet of the second branch pipe, the outlet of the third evaporating copper tube is connected to the other inlet of the second branch pipe, and the outlet of the second branch pipe is connected to the inlet of the compressor.

[0023] In some embodiments of this utility model, based on the aforementioned scheme, a first condensation branch pipe and a second condensation branch pipe are provided between the outlet of the dryer and the inlet of the first electronic expansion valve, the inlet of the second electronic expansion valve and the inlet of the third electronic expansion valve.

[0024] The outlet of the dryer is connected to the inlet of the first condenser branch pipe, and the two outlets of the first condenser branch pipe are respectively connected to the inlet of the second condenser branch pipe and the inlet of the third electronic expansion valve.

[0025] The two outlets of the second condenser branch pipe are respectively connected to the inlet of the first electronic expansion valve and the inlet of the second electronic expansion valve.

[0026] In some embodiments of this utility model, based on the aforementioned scheme, a first pressure gauge is installed at the outlet of the first electronic expansion valve, a second pressure gauge is installed at the outlet of the second electronic expansion valve, and a third pressure gauge is installed at the outlet of the third electronic expansion valve.

[0027] In some embodiments of this utility model, based on the aforementioned scheme, a first thermometer is installed at the outlet of the first evaporating copper tube, a second thermometer is installed at the outlet of the second evaporating copper tube, and a third thermometer is installed at the outlet of the third evaporating copper tube.

[0028] In some embodiments of this utility model, based on the aforementioned scheme, the first evaporation copper tube inlet, the second evaporation copper tube inlet, the third evaporation copper tube inlet, the first evaporation copper tube outlet, the second evaporation copper tube outlet, and the third evaporation copper tube outlet are all wrapped with a heat insulation layer.

[0029] The technical solution of this utility model has the following beneficial effects:

[0030] 1. By utilizing the phase change of the refrigerant inside the split evaporation copper tube, a large amount of heat is quickly carried away, resulting in good heat dissipation and high efficiency.

[0031] 2. The cabinet is isolated inside and out, with a protection level of up to P65.

[0032] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0034] Figure 1 A schematic diagram of a cooling device for a high-protection-level aircraft ground static power supply according to an embodiment of the present invention is shown.

[0035] Explanation of reference numerals in the attached figures

[0036] 1-Static power supply, 2-Transformer, 3-Reactor, 4-Power module, 5-Transformer cold plate, 6-Reactor cold plate, 7-Power module cold plate, 8-Compressor, 9-Condenser, 10-Dryer, 11-First condenser branch pipe, 12-Second condenser branch pipe, 13-First electronic expansion valve, 14-Second electronic expansion valve, 15-Third electronic expansion valve, 16-First evaporator copper tube inlet, 17-Second evaporator copper tube inlet, 18-Third evaporator copper tube inlet, 19-First evaporator copper tube outlet, 20-Second evaporator copper tube outlet, 21-Third evaporator copper tube outlet, 22-First evaporator branch pipe, 23-Second evaporator branch pipe, 24-First pressure gauge, 25-Second pressure gauge, 26-Third pressure gauge, 27-First thermometer, 28-Second thermometer, 29-Third thermometer. Detailed Implementation

[0037] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0038] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., may be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of terms can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in orders other than those shown or described.

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] The following description, in conjunction with the accompanying drawings, details some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0042] To achieve cooling and heat dissipation for ground static power supplies of high-protection-level aircraft, this utility model provides a cooling device for ground static power supplies of high-protection-level aircraft. This device adopts a cold plate heat dissipation structure, which quickly transfers the heat generated by the operation of high-power devices such as power modules, transformers, and reactors in the static power supply to the refrigerant through the cold plate, and then achieves rapid heat dissipation through the phase change cycle of the refrigerant. It has high heat transfer efficiency and good heat dissipation effect.

[0043] Specifically, this utility model embodiment provides a cooling device for a high-protection-level aircraft ground static power supply, wherein the static power supply internally includes a transformer, a reactor, and a power module, and the device includes:

[0044] External condenser piping and internal condenser piping assembly;

[0045] The cabinet condenser piping group includes a first cabinet condenser piping for cooling the transformer, a second cabinet condenser piping for cooling the reactor, and a third cabinet condenser piping for cooling the power module.

[0046] The outlets of the first cabinet internal condenser pipe, the second cabinet internal condenser pipe, and the third cabinet internal condenser pipe are all connected to the inlet of the external condenser pipe, and the outlet of the external condenser pipe is connected to the inlet of the first cabinet internal condenser pipe, the second cabinet internal condenser pipe, and the third cabinet internal condenser pipe, respectively.

[0047] Understandably, the condenser piping inside the cabinet absorbs heat through the vaporization of the refrigerant, removing the heat generated by the components inside the cabinet. The condenser piping outside the cabinet transfers the heat inside the static power supply to the outside of the cabinet through the liquefaction of the refrigerant, thus achieving heat dissipation.

[0048] In some feasible embodiments, based on the aforementioned scheme, the external condenser piping includes: a compressor, a condenser, and a dryer connected in sequence;

[0049] The compressor inlet is also connected to the outlets of the condenser pipes in the first cabinet, the second cabinet, and the third cabinet.

[0050] The outlet of the dryer is also connected to the inlet of the condenser pipes in the first cabinet, the second cabinet, and the third cabinet.

[0051] It is understandable that the refrigerant generated by the evaporation of the condensing pipes in the first cabinet, the second cabinet, and the third cabinet is delivered to the condenser by the compressor for condensation and heat release, thereby transferring the heat inside the static power supply to the outside of the cabinet through the liquefaction and heat release of the refrigerant, and thus achieving heat dissipation.

[0052] In some feasible embodiments, based on the aforementioned scheme, the condensation pipeline inside the first cabinet includes: a first electronic expansion valve, a first evaporating copper tube inlet pipe, a transformer cold plate, and a first evaporating copper tube outlet pipe connected in sequence;

[0053] The inlet of the first electronic expansion valve is connected to the outlet of the dryer, the transformer cold plate is mounted on the transformer, and the outlet of the first evaporating copper tube is connected to the inlet of the compressor.

[0054] In some feasible embodiments, based on the aforementioned scheme, the condenser piping inside the second cabinet includes: a second electronic expansion valve, a second evaporator copper tube inlet pipe, a reactor cold plate, and a second evaporator copper tube outlet pipe connected in sequence;

[0055] The inlet of the second electronic expansion valve is connected to the outlet of the dryer, the reactor cold plate is mounted on the reactor, and the outlet of the second evaporating copper tube is connected to the inlet of the compressor.

[0056] In some feasible embodiments, based on the aforementioned scheme, the condenser piping inside the third cabinet includes: a third electronic expansion valve, a third evaporator copper tube inlet pipe, a power module cold plate, and a third evaporator copper tube outlet pipe connected in sequence;

[0057] The inlet of the third electronic expansion valve is connected to the outlet of the dryer, the power module cold plate is mounted on the power module, and the outlet of the third evaporating copper tube is connected to the inlet of the compressor.

[0058] It is understood that in this embodiment of the utility model, each internal condenser pipe is connected to the external condenser pipe, thereby realizing the condensation of the transformer, reactor and power module.

[0059] In some feasible embodiments, based on the aforementioned scheme, a first evaporation branch pipe and a second evaporation branch pipe are provided between the compressor inlet and the outlet of the first evaporation copper tube outlet pipe, the outlet of the second evaporation copper tube outlet pipe, and the outlet of the third evaporation copper tube outlet pipe.

[0060] The outlets of the first and second evaporating copper tubes are respectively connected to the two inlets of the first evaporating branch pipe, the outlet of the first evaporating branch pipe is connected to one inlet of the second branch pipe, the outlet of the third evaporating copper tube is connected to the other inlet of the second branch pipe, and the outlet of the second branch pipe is connected to the inlet of the compressor.

[0061] Understandably, the function of the first and second evaporation branch pipes is to combine the outlets of the three condenser pipes in the cabinet into one, so as to connect with the compressor and deliver the gas produced by each pipe to the compressor.

[0062] In some feasible embodiments, based on the aforementioned scheme, a first condensation branch pipe and a second condensation branch pipe are provided between the outlet of the dryer and the inlet of the first electronic expansion valve, the inlet of the second electronic expansion valve and the inlet of the third electronic expansion valve.

[0063] The outlet of the dryer is connected to the inlet of the first condenser branch pipe, and the two outlets of the first condenser branch pipe are respectively connected to the inlet of the second condenser branch pipe and the inlet of the third electronic expansion valve.

[0064] The two outlets of the second condenser branch pipe are respectively connected to the inlet of the first electronic expansion valve and the inlet of the second electronic expansion valve.

[0065] Understandably, the function of the first and second condenser branch pipes is to transfer the refrigerant obtained after processing by the dryer to the condenser pipes in the three cabinets respectively.

[0066] In some feasible embodiments, based on the foregoing scheme, a first pressure gauge is installed at the outlet of the first electronic expansion valve, a second pressure gauge is installed at the outlet of the second electronic expansion valve, and a third pressure gauge is installed at the outlet of the third electronic expansion valve.

[0067] In some feasible embodiments, based on the aforementioned scheme, a first thermometer is installed at the outlet of the first evaporating copper tube, a second thermometer is installed at the outlet of the second evaporating copper tube, and a third thermometer is installed at the outlet of the third evaporating copper tube.

[0068] Understandably, three pressure gauges are used to detect the pressure at the outlet of the electronic expansion valve, and three temperature gauges are used to detect the temperature at the outlet of the evaporating copper tube. Based on these two parameters, the superheat of the evaporating copper tube can be calculated for adjustment. Since there is a suitable range for superheat, both excessive and insufficient superheat will have adverse effects, so it is necessary to pay attention to the superheat at all times.

[0069] In some feasible embodiments, based on the aforementioned scheme, the first evaporation copper tube inlet, the second evaporation copper tube inlet, the third evaporation copper tube inlet, the first evaporation copper tube outlet, the second evaporation copper tube outlet, and the third evaporation copper tube outlet are all wrapped with a heat insulation layer.

[0070] Understandably, wrapping the inlet and outlet pipes of the evaporating copper tube with an insulation layer can prevent the hot air inside from condensing into water upon contact with the cold air, which could then fall onto electrical components and cause a short circuit. For example, the insulation layer could be a layer of insulating cotton.

[0071] An exemplary schematic diagram of a cooling device for a high-protection-level aircraft ground static variable power supply is provided.

[0072] like Figure 1 As shown, the static power supply 1 is equipped with three high-power devices: transformer 2, reactor 3, and power module 4. The device provided in this example mainly includes external condenser piping and internal condenser piping.

[0073] The external condenser piping includes a compressor 8, a condenser 9, a dryer 10, a first condenser branch pipe 11, and a second evaporator branch pipe 23. The second evaporator branch pipe 23, compressor 8, condenser 9, dryer 10, and first condenser branch pipe 11 are connected sequentially. The compressor 8 transforms the low-pressure, low-temperature gas evaporated from the evaporator copper pipe into a high-pressure, high-temperature gas. After passing through the condenser 9, the high-pressure, high-temperature gas (gaseous refrigerant) releases heat and condenses into a high-pressure, low-temperature liquid refrigerant. After passing through the dryer 10, the first condenser branch pipe 11, and the second condenser branch pipe 12, it becomes three parallel branches. The high-pressure, low-temperature refrigerant is throttled by the second electronic expansion valve 13, the first electronic expansion valve 14, and the third electronic expansion valve 15, respectively, becoming a low-pressure, low-temperature liquid refrigerant, which then enters the second evaporator copper pipe inlet pipe 16, the first evaporator copper pipe inlet pipe 17, and the third evaporator copper pipe inlet pipe 18.

[0074] The cabinet-mounted condenser piping system consists of a first cabinet-mounted condenser piping system, a second cabinet-mounted condenser piping system, and a third cabinet-mounted condenser piping system. The first cabinet-mounted condenser piping system includes a first electronic expansion valve 13, a first evaporator copper tube inlet pipe 6, a transformer cold plate 5, and a first evaporator copper tube outlet pipe 19 connected in sequence. The transformer cold plate 5 is mounted on the transformer 2. The second cabinet-mounted condenser piping system includes a second electronic expansion valve 14, a second evaporator copper tube inlet pipe 15, a reactor cold plate 6, and a second evaporator copper tube outlet pipe 20 connected in sequence. The reactor cold plate 6 is mounted on the reactor 3. The third cabinet-mounted condenser piping system includes a third electronic expansion valve 15, a third evaporator copper tube inlet pipe 18, a power module cold plate 7, and a third evaporator copper tube outlet pipe 21 connected in sequence. The power module cold plate 7 is mounted on the power module 4. The first evaporator copper tube outlet pipe 19 and the second evaporator copper tube outlet pipe 20 are combined into one line at the first evaporator branch pipe 22.

[0075] The evaporator copper tubes can be configured as one or more lines according to the heat source requirements. Multiple parallel evaporator copper tubes can be connected to the cold plate of each high-power heating device, resulting in better heat dissipation. The transformer, reactor, and power module internally utilize coils to increase the heat exchange area. The first pressure gauge 24, the second pressure gauge 25, and the third pressure gauge 26 are used to detect the pressure at the outlet of the electronic expansion valve, and the first thermometer 27, the second thermometer 28, and the third thermometer 29 are used to detect the temperature at the outlet of the evaporator copper tube. Based on these two parameters, the superheat of the evaporator copper tube can be calculated. By adjusting the opening of the electronic expansion valve, the superheat of the evaporator branch can be controlled, thereby achieving a good cooling effect.

[0076] The low-pressure, low-temperature refrigerant that passes through the electronic expansion valve flows in the evaporating copper tube. The operation of the static variable power supply causes the temperature inside the cabinet to be higher than the temperature of the refrigerant. Heat in the air is transferred to the evaporating copper tube through thermal convection, and then to the refrigerant. When the temperature of the refrigerant exceeds its boiling point, the refrigerant evaporates, and the evaporation absorbs heat and removes a large amount of heat from the air.

[0077] After the heat dissipation problem of the main heat-generating components inside the static transformer is solved, there is no need to design a cooling fan. The cabinet design has no ventilation windows to prevent any liquids and debris from seeping into the machine, and the protection level can reach P65.

[0078] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. It should be understood that the present invention is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A cooling device for a high-protection-level aircraft ground static power supply, wherein, The static variable power supply internally includes a transformer, a reactor, and a power module, characterized in that it comprises: External condenser piping and internal condenser piping assembly; The cabinet condenser piping group includes a first cabinet condenser piping for cooling the transformer, a second cabinet condenser piping for cooling the reactor, and a third cabinet condenser piping for cooling the power module. The outlets of the first cabinet internal condenser pipe, the second cabinet internal condenser pipe, and the third cabinet internal condenser pipe are all connected to the inlet of the external condenser pipe, and the outlet of the external condenser pipe is connected to the inlet of the first cabinet internal condenser pipe, the second cabinet internal condenser pipe, and the third cabinet internal condenser pipe, respectively.

2. The refrigeration device according to claim 1, characterized in that, The external condenser piping includes a compressor, a condenser, and a dryer connected in sequence. The compressor inlet is also connected to the outlets of the condenser pipes in the first cabinet, the second cabinet, and the third cabinet. The outlet of the dryer is also connected to the inlet of the condenser pipes in the first cabinet, the second cabinet, and the third cabinet.

3. The refrigeration device according to claim 2, characterized in that, The first cabinet's condenser piping includes: a first electronic expansion valve, a first evaporator copper tube inlet pipe, a transformer cold plate, and a first evaporator copper tube outlet pipe connected in sequence; The inlet of the first electronic expansion valve is connected to the outlet of the dryer, the transformer cold plate is mounted on the transformer, and the outlet of the first evaporating copper tube is connected to the inlet of the compressor.

4. The refrigeration device according to claim 3, characterized in that, The second cabinet's condenser piping includes: a second electronic expansion valve, a second evaporator copper tube inlet pipe, a reactor cold plate, and a second evaporator copper tube outlet pipe connected in sequence; The inlet of the second electronic expansion valve is connected to the outlet of the dryer, the reactor cold plate is mounted on the reactor, and the outlet of the second evaporating copper tube is connected to the inlet of the compressor.

5. The refrigeration device according to claim 4, characterized in that, The condenser piping inside the third cabinet includes: a third electronic expansion valve, a third evaporator copper tube inlet pipe, a power module cold plate, and a third evaporator copper tube outlet pipe connected in sequence; The inlet of the third electronic expansion valve is connected to the outlet of the dryer, the power module cold plate is mounted on the power module, and the outlet of the third evaporating copper tube is connected to the inlet of the compressor.

6. The refrigeration device according to claim 5, characterized in that, A first evaporation branch pipe and a second evaporation branch pipe are provided between the inlet of the compressor and the outlet of the first evaporation copper tube outlet pipe, the outlet of the second evaporation copper tube outlet pipe, and the outlet of the third evaporation copper tube outlet pipe. The outlets of the first and second evaporating copper tubes are respectively connected to the two inlets of the first evaporating branch pipe, the outlet of the first evaporating branch pipe is connected to one inlet of the second branch pipe, the outlet of the third evaporating copper tube is connected to the other inlet of the second branch pipe, and the outlet of the second branch pipe is connected to the inlet of the compressor.

7. The refrigeration device according to claim 5, characterized in that, A first condensing branch pipe and a second condensing branch pipe are provided between the outlet of the dryer and the inlet of the first electronic expansion valve, the inlet of the second electronic expansion valve, and the inlet of the third electronic expansion valve. The outlet of the dryer is connected to the inlet of the first condenser branch pipe, and the two outlets of the first condenser branch pipe are respectively connected to the inlet of the second condenser branch pipe and the inlet of the third electronic expansion valve. The two outlets of the second condenser branch pipe are respectively connected to the inlet of the first electronic expansion valve and the inlet of the second electronic expansion valve.

8. The refrigeration device according to claim 5, characterized in that, A first pressure gauge is installed at the outlet of the first electronic expansion valve, a second pressure gauge is installed at the outlet of the second electronic expansion valve, and a third pressure gauge is installed at the outlet of the third electronic expansion valve.

9. The refrigeration device according to claim 5, characterized in that, A first thermometer is installed at the outlet of the first evaporating copper tube, a second thermometer is installed at the outlet of the second evaporating copper tube, and a third thermometer is installed at the outlet of the third evaporating copper tube.

10. The refrigeration device according to claim 5, characterized in that, The first evaporating copper tube inlet, the second evaporating copper tube inlet, the third evaporating copper tube inlet, the first evaporating copper tube outlet, the second evaporating copper tube outlet, and the third evaporating copper tube outlet are all wrapped with a heat insulation layer.

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