A compact compression refrigeration and heat dissipation system based on double evaporators and its application

Abstract

The present invention relates to a compact compression refrigeration and heat dissipation system based on a double evaporator and its application. The compact compression refrigeration and heat dissipation system comprises a main evaporation system, which is connected to a two-phase cooling system through a two-phase fluid connector. The main evaporation system and the two-phase cooling system are electrically connected to an electronic control system respectively. The main evaporation system comprises a plurality of main evaporators arranged in parallel. The two-phase cooling system comprises a second evaporator, a compressor and a condenser connected in series. The second evaporator is provided with an electronic expansion valve and is arranged on the back of the condenser. The second evaporator is connected in parallel with a three-way valve through a pipeline. A throttle valve is fixedly connected between the condenser and the first two-phase fluid connector. The compact compression refrigeration and heat dissipation system based on a double evaporator has the advantages of improving temperature stability, reducing space occupancy, and improving work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of heat dissipation management of optical fiber lasers, and in particular to a compact compression refrigeration heat dissipation system based on double evaporators and its application. Background Art

[0002] At present, with the development of fiber lasers in recent years, a single fiber can achieve 10 2 ~10 3 The output power of W level generates a lot of heat due to the low photoelectric conversion efficiency. The thermal diffusion effect inside the material causes internal stress, which affects the refractive index of the optical fiber. The part with lower refractive index is prone to thermal damage, which damages the optical fiber and even causes it to explode. As laser equipment develops towards device miniaturization, light weight, and high system integration, the heat conduction area is further reduced, and the heat flux density is further increased, resulting in a sharp increase in the temperature of the pump source and other components. The maximum heat flux density peak of the internal components can significantly exceed 10 2 W / cm 2 This magnitude is even higher, resulting in negative effects such as insufficient heat dissipation causing uneven temperature distribution and excessive temperature of the pump source.

[0003] Finding a solution with high heat dissipation capacity has become a hot topic and focus of research in the thermal design industry today. Limiting factors such as volume, mass, and efficiency make conventional heat exchange systems no longer suitable for current market needs.

[0004] To this end, we have developed a compact compression refrigeration and heat dissipation system based on dual evaporators to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a compact compression refrigeration and heat dissipation system based on a double evaporator, which has the advantages of improving temperature stability, reducing space occupancy, and improving work efficiency.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a compact compression refrigeration and heat dissipation system based on a double evaporator, comprising a main evaporation system, the main evaporation system is connected to a two-phase cooling system through a first two-phase fluid connector and a second two-phase fluid connector respectively, the main evaporation system and the two-phase cooling system are electrically connected to an electronic control system respectively, the main evaporation system comprises a plurality of main evaporators arranged in parallel, the two-phase cooling system comprises a second evaporator, a compressor and a condenser connected in sequence, an electronic expansion valve is provided at one end of the second evaporator and is arranged on the back of the condenser, the second evaporator is connected in parallel with a three-way valve through a pipeline, a throttle valve is fixedly connected between the condenser and the first two-phase fluid connector, and the electronic control system controls the three-way valve, the throttle valve, the compressor and the electronic expansion valve through a PLC controller to dissipate heat from a high-power laser.

[0007] Preferably, the electronic control system includes a chip, and the chip is controlled by a PLC controller.

[0008] Preferably, the three-way valve is connected in series with a first thermometer and a first pressure sensor, and the first thermometer is arranged close to the second two-phase fluid connector.

[0009] Preferably, a pump source is provided at one side of the main evaporator, and a third two-phase fluid connector and a fourth two-phase fluid connector are respectively connected at both ends, the third two-phase fluid connector is connected to the second two-phase fluid connector, and the fourth two-phase fluid connector is connected to the first two-phase fluid connector.

[0010] Preferably, the main evaporator is further provided with a fiber optic disc, and the fiber optic disc is arranged on one side of the optical cold plate.

[0011] Preferably, a liquid storage tank is provided between the second evaporator and the compressor, the second evaporator is a copper fin radiator, and is arranged in parallel at the air outlet of the condenser.

[0012] Preferably, the condenser is a tube-and-belt heat exchanger and is provided with a fan.

[0013] Preferably, the electronic expansion valve is of a stepping motor type or an electromagnetic coil type.

[0014] Preferably, the main evaporator pressure is set to 1.1 MPa, and the evaporation temperature is set to 10°C.

[0015] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0016] 1. The compact compression refrigeration and heat dissipation system based on dual evaporators described in the present invention is that a single compression refrigeration system cannot quickly respond to the sudden change in heat caused by multiple starts and stops of the laser, and the system cooling capacity lags significantly. Therefore, the surface temperature of the evaporator fluctuates violently during this process, and the temperature difference between the monitoring points is too large, making it impossible to guarantee the light output quality. The present invention guarantees the light output quality.

[0017] 2. The present invention applies the second evaporator to the compression refrigeration system and uses the condenser outlet air to realize the standby operation of the second evaporator, which can not only ensure the system stability when the compressor is running at a low frequency, but also achieve excellent temperature control when the laser is started, ensuring stable temperature changes and small fluctuations.

[0018] 3. The main evaporation system is set on the cold water plate, and the condenser is a tube-belt heat exchanger to reduce the volume and weight.

[0019] 4. The second evaporator is arranged in parallel at the air outlet of the condenser, and the heat dissipation is controlled by the PLC controller to improve the working efficiency of the fiber laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the compact compression refrigeration and heat dissipation system based on double evaporators according to the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Figure 1 In the invention, a compact compression refrigeration and heat dissipation system based on a double evaporator includes a main evaporation system 10, which is connected to a two-phase cooling system 20 through a first two-phase fluid connector 15 and a second two-phase fluid connector 16, respectively. The main evaporation system 10 and the two-phase cooling system 20 are electrically connected to an electronic control system 31, respectively. The main evaporation system 10 includes a plurality of main evaporators 13 arranged in parallel, and the two-phase cooling system 20 includes a second evaporator 22, a compressor 24 and a condenser 25 connected in series. An electronic expansion valve is provided at one end of the second evaporator 22, and the electronic expansion valve is a stepping motor type or an electromagnetic coil type, and is electrically connected to a PLC controller. The electronic expansion valve is preferably a stepping motor type. A liquid storage tank 23 is provided between the second evaporator 22 and the compressor 24. The second evaporator 22 is arranged on the back of the condenser 25. The second evaporator 22 is connected in parallel with an electromagnetic three-way valve 21 through a pipeline. A throttle valve 26 is fixedly connected between the condenser 25 and the first two-phase fluid connector 15. The electronic control system 31 controls the three-way valve 21, the throttle valve 26, the compressor 24, and the electronic expansion valve through the PLC controller to dissipate heat for the high-power laser. The compressor 24 is a 1.5P variable frequency compressor. The compact compression refrigeration and heat dissipation system is used for high-power fiber lasers.

[0023] The electronic control system 31 includes a chip 311, which is controlled by a PLC controller. The system adjusts the cooling capacity of the system by adjusting the fan speed and the compressor frequency. The chip 311 obtains parameters such as the surface temperature of the cold plate, the fan speed, the compressor frequency, the thermometer and the pressure sensor. The PLC controller cools the laser according to these parameters.

[0024] The three-way valve 21 is connected in series with a first thermometer 211 and a first pressure sensor 212 . The first thermometer 211 is disposed close to the second two-phase fluid connector 16 .

[0025] A pump source 12 is provided at one side of the main evaporator 13, and a third two-phase fluid connector 11 and a fourth two-phase fluid connector 14 are connected at both ends. The main evaporator 13 is also provided with an optical fiber disk, which is set to one side of the optical cold plate. The pressure of the main evaporator 13 is set to 1.1MPa, the evaporation temperature is set to 10°C, and the refrigerant is R410A, that is, the refrigerant of the system. The third two-phase fluid connector 11 is connected to the second two-phase fluid connector 16, and the fourth two-phase fluid connector 14 is connected to the first two-phase fluid connector 15.

[0026] When the three-way valve 21 is closed, the refrigerant will not flow into the second evaporator 22, but will be stored in the liquid storage tank 23. The second evaporator 22 is a copper fin radiator and is arranged in parallel at the air outlet of the condenser 25.

[0027] To reduce the volume and weight of the system, the condenser 25 is a tube-and-belt heat exchanger and is provided with a fan 251. The fan is a DC axial flow suction fan, which controls the speed of the fan blades by regulating the current to achieve the change of the fan air volume, and the maximum speed of the fan is 3100rpm.

[0028] The refrigerant at the compressor outlet is controlled by a three-way valve to prepare for the subsequent variable working condition experiment. The fan is installed on the top to provide the heat exchange power source for the condenser. In the present invention, the opening of the expansion valve and the opening and closing of each valve are controlled by a circuit board to achieve system regulation.

[0029] The dual evaporator system controls the operation of the system by monitoring the cold plate surface temperature, refrigerant working pressure and temperature, and cooperating with the electromagnetic three-way valve and power controller. Set temperature measurement points to monitor the working temperature of the refrigerant, measure the evaporator inlet temperature, the compressor inlet and outlet pressures, and the throttle valve temperature to monitor the development of the cycle process.

[0030] A first thermometer 211 and a first pressure sensor 212 are provided at the main evaporator outlet, a second thermometer 261 and a second pressure sensor 262 are provided at the main evaporator inlet, and a third thermometer 241 and a third pressure sensor 242 are provided at the compressor outlet. The thermometer and the pressure sensor are electrically connected to the chip 311 .

[0031] In standby mode, the compressor runs at a fixed frequency of 20Hz. The cooling capacity of the refrigerant R410A in the main evaporator is small, and the gasification process is mainly completed in the second evaporator.

[0032] The three-way valve 21 is used to control the flow direction of the refrigerant, and the connection state of the second evaporator is changed to switch the system working mode. The optical cold plate is made of an integral aluminum plate. The liquid cooling channel and the chip mounting end face are located on the same side of the cold plate, and the end face is sealed with the optical fiber surface by brazing to form a flow channel. The second evaporator is a copper fin heat sink, which is arranged on the back of the condenser. It uses the heat of the condenser's air outlet to evaporate the refrigerant at the compressor outlet when the system's optoelectronic instruments are shut down.

[0033] The application of the compact compression refrigeration and heat dissipation system based on the dual evaporator is as follows: when the laser is working, the PLC controller controls the compression refrigeration and heat dissipation system to start running according to the sensor data of the chip, and the refrigerant R410A enters the condenser 25 from the outlet of the compressor 24 to dissipate heat, isenthalpic throttling is performed through the throttle valve 26, flows into the main evaporator 13 for evaporation and heat exchange, enters the three-way valve 21, and flows back to the compressor 24 for recompression; when the laser is not working, the running path of the refrigerant in the system is controlled by the reversal of the three-way valve 21, so that in the standby state, the liquid refrigerant flowing out of the main evaporator 13 evaporates in the second evaporator 22, and the hot air at the outlet of the condenser 25 serves as the heat source of the second evaporator 22. When the laser enters the working state, the three-way valve 21 is closed, and the refrigeration system still has a certain cooling capacity, so as to achieve temperature stability when the laser is started. When the three-way valve 21 is closed, the refrigerant will not flow into the second evaporator 22.

[0034] The above are only specific application examples of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A compact compression refrigeration and heat dissipation system based on a double evaporator, characterized in that: The invention comprises a main evaporation system (10), wherein the main evaporation system (10) is connected to a two-phase cooling system (20) through a first two-phase fluid connector (15) and a second two-phase fluid connector (16), respectively; the main evaporation system (10) and the two-phase cooling system (20) are electrically connected to an electronic control system (31), respectively; the main evaporation system (10) comprises a plurality of main evaporators (13) arranged in parallel; the two-phase cooling system (20) comprises a second evaporator (22), a compressor (24) and a cooling system (20) connected in sequence; A condenser (25), an electronic expansion valve is provided at one end of the second evaporator (22) and is arranged on the back of the condenser (25), the second evaporator (22) is connected in parallel with a three-way valve (21) through a pipeline, a throttle valve (26) is fixedly connected between the condenser (25) and the first two-phase fluid connector (15), and the electronic control system (31) controls the three-way valve (21), the throttle valve (26), the compressor (24), and the electronic expansion valve through a PLC controller to dissipate heat from the high-power laser; The electronic control system (31) comprises a chip (311), and the chip (311) is controlled by a PLC controller; The three-way valve (21) is connected in series with a first thermometer (211) and a first pressure sensor (212), and the first thermometer (211) is arranged close to the second two-phase fluid connector (16); A first thermometer (211) and a first pressure sensor (212) are provided at the outlet of the main evaporator (13), a second thermometer (261) and a second pressure sensor (262) are provided at the inlet of the main evaporator (13), and a third thermometer (241) and a third pressure sensor (242) are provided at the outlet of the compressor (24). The first thermometer (211), the second thermometer (261), the third thermometer (241), the first pressure sensor (212), the second pressure sensor (262) and the third pressure sensor (242) are electrically connected to the chip (311).

2. According to claim 1, the compact compression refrigeration and heat dissipation system based on double evaporators is characterized in that: A pump source (12) is provided at one side of the main evaporator (13), and two ends thereof are respectively connected to a third two-phase fluid connector (11) and a fourth two-phase fluid connector (14); the third two-phase fluid connector (11) is in communication with the second two-phase fluid connector (16), and the fourth two-phase fluid connector (14) is in communication with the first two-phase fluid connector (15).

3. According to claim 2, the compact compression refrigeration and heat dissipation system based on double evaporators is characterized in that: The main evaporator (13) is also provided with an optical fiber disk, which is arranged on one side of the optical cold plate.

4. The compact compression refrigeration and heat dissipation system based on double evaporators according to claim 1 is characterized in that: A liquid storage tank (23) is provided between the second evaporator (22) and the compressor (24); the second evaporator (22) is a copper fin radiator and is arranged in parallel at the air outlet of the condenser (25).

5. The compact compression refrigeration and heat dissipation system based on double evaporators according to claim 4 is characterized in that: The condenser (25) is a tube-belt heat exchanger and is provided with a fan (251).

6. The compact compression refrigeration and heat dissipation system based on double evaporators according to claim 1 is characterized in that: The electronic expansion valve is a stepping motor type or an electromagnetic coil type.

7. The compact compression refrigeration and heat dissipation system based on double evaporators according to claim 1 is characterized in that: The pressure of the main evaporator (13) is set to 1.1 MPa, and the evaporation temperature is set to 10°C.

8. Application of the compact compression refrigeration and heat dissipation system based on double evaporators according to any one of claims 1 to 7, characterized in that: Compact compression cooling system for high power fiber lasers.

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