Compressor cooling system of laser cooling-water machine

Abstract

The invention discloses a compressor cooling system of a laser water chiller. The compressor cooling system comprises a compressor, a refrigerant cooling device, a coil evaporator refrigerant pipeline, a front evaporator refrigerant pipeline, a plate heat exchanger refrigerant pipeline, a cooling container and a cooling medium supply device. A refrigerant pipeline of the coil evaporator, a refrigerant pipeline of the front evaporator and a refrigerant pipeline of the plate heat exchanger are all communicated with an inlet of the compressor, and an outlet of the compressor is communicated with the refrigerant cooling device; a refrigerant pipeline of the coil evaporator, a refrigerant pipeline of the front evaporator and a refrigerant pipeline of the plate heat exchanger are respectively communicated with the refrigerant cooling device; the plate heat exchanger refrigerant pipeline comprises a plate heat exchanger, and the plate heat exchanger is provided with a cooling medium channel. The exhaust temperature, the exhaust pressure and the operation current of the compressor can be reduced, sustainable operation of the compressor is ensured, and the compressor can meet the use requirements of more different working environment temperatures.

Description

Technical Field

[0001] This invention relates to the field of laser chillers, and more specifically to a compressor cooling system for a laser chiller. Background Technology

[0002] Lasers generate a significant amount of waste heat during operation (especially high-power lasers). If this heat cannot be dissipated in time, the internal temperature of the laser will rise, directly affecting its output power, wavelength stability, and beam quality. Laser chillers, as crucial auxiliary equipment providing stable cooling for laser devices, are commonly used to supply lasers with cooling water at a constant temperature (e.g., 25°C). This cooling water facilitates heat exchange within the laser, achieving a cooling effect.

[0003] Existing laser chillers require an operating environment temperature below 45℃. However, in the Middle East and Southeast Asia, summer temperatures are high, reaching over 50℃, and even briefly exceeding 55℃. Under these high temperatures, existing laser chillers operate at full load, causing the compressor's discharge pressure and temperature to rise continuously. This results in increased compressor heat generation, reduced condenser heat dissipation at higher ambient temperatures, and higher condensing pressure. As the compressor's discharge temperature and current increase, it may trigger thermal protection and shut down, or even fail. Consequently, the compressor cannot operate stably at these high ambient temperatures (45-55℃), limiting its operating range to below 45℃ and failing to meet the industry's stringent requirements. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a compressor cooling system for a laser chiller, which can improve the heat dissipation effect of the compressor, enabling it to meet the usage requirements of more different working environment temperatures and expanding its applicable working environment temperature range.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A compressor cooling system for a laser chiller includes a compressor, a refrigerant cooling device, refrigerant lines for a coil evaporator, refrigerant lines for a pre-evaporator, refrigerant lines for a plate heat exchanger, a cooling container, and a cooling medium supply device. The refrigerant lines for the coil evaporator, pre-evaporator, and plate heat exchanger are all connected to the compressor inlet, and the compressor outlet is connected to the refrigerant cooling device. The refrigerant lines for the coil evaporator, pre-evaporator, and plate heat exchanger are respectively connected to the refrigerant cooling device. The refrigerant lines for the plate heat exchanger... The device includes a plate heat exchanger with a cooling medium channel; one end of the cooling medium channel is connected to a cooling medium inlet pipe, and the other end is connected to a cooling medium return pipe; the compressor is located inside a cooling container, and the cooling medium supply device is used to supply liquid cooling medium to the cooling container; the cooling medium inlet pipe is connected to the cooling container, and the cooling medium inlet pipe is used to allow gaseous cooling medium, which absorbs heat from the compressor and forms a gaseous state, to flow in; the cooling medium return pipe is connected to the cooling container.

[0007] The refrigerant cooling device includes a refrigerant cooling pipeline, on which a condenser is installed; the refrigerant cooling pipeline is connected to the outlet of the compressor; the refrigerant pipelines of the coil evaporator, the pre-evaporator, and the plate heat exchanger are respectively connected to the refrigerant cooling pipeline.

[0008] The condenser is a microchannel condenser.

[0009] The refrigerant cooling device also includes a cooling fan, which is used to generate airflow through the condenser.

[0010] The compressor inlet is connected to a refrigerant return main pipe, and the refrigerant lines of the coil evaporator, the pre-evaporator, and the plate heat exchanger are respectively connected to the compressor inlet through the refrigerant return main pipe.

[0011] The refrigerant piping of the coil evaporator includes a coil evaporator; the refrigerant piping of the pre-evaporator includes a pre-evaporator.

[0012] The cooling medium is a fluorinated liquid.

[0013] The compressor is located inside a cooling container and is immersed in a liquid cooling medium.

[0014] The upper end of the cooling container is connected to the upper end of the cooling medium supply device via a liquid level balance pipe.

[0015] A solenoid valve is provided between the lower end of the cooling container and the lower end of the cooling medium supply device. The compressor cooling system of the laser chiller also includes an exhaust temperature sensor, which is used to detect the temperature of the refrigerant discharged from the compressor. When the exhaust temperature sensor detects that the temperature of the refrigerant discharged from the compressor is greater than 110°C, the solenoid valve opens.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This invention provides a compressor cooling system for a laser chiller. It combines a compressor, a refrigerant cooling device, refrigerant piping for a coil evaporator, refrigerant piping for a pre-evaporator, refrigerant piping for a plate heat exchanger, a cooling container, and a cooling medium supply device. The compressor is placed inside the cooling container, and the cooling medium supply device supplies liquid cooling medium to the container. The plate heat exchanger piping utilizes a plate heat exchanger, and the cooling medium enters the pipes to allow the gaseous cooling medium, which absorbs heat from the compressor, to flow in. This ensures that the cooling medium rapidly absorbs heat from the compressor during operation. Vaporization and phase change cause the cooling medium to boil and transfer heat to the compressor housing surface, enabling rapid cooling of the compressor and improving its heat dissipation. This allows the compressor to meet the requirements of a wider range of operating temperatures, expanding its applicable operating temperature range. Furthermore, by combining solenoid valves and exhaust temperature sensors, sufficient cooling medium is maintained to cool the compressor, reducing its exhaust temperature, exhaust pressure, and operating current, ensuring continuous operation and further expanding its applicable operating temperature range. In addition, the compressor achieves better heat exchange efficiency, significantly improving its heat dissipation effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the compressor cooling system of the laser chiller of the present invention;

[0019] Figure 2 This is a perspective view of the compressor cooling system of the laser chiller of the present invention;

[0020] Figure 3 This is a schematic diagram showing the connection between the cooling container and the cooling medium supply device;

[0021] Figure 4 This is a schematic diagram showing the connection between the compressor and the refrigerant cooling piping.

[0022] Figure 5 This is a schematic diagram showing the connection between the plate heat exchanger and the cooling medium inlet pipe and the cooling medium return pipe.

[0023] Figure 6 A 3D view of the pre-evaporator;

[0024] Figure 7 This is a schematic diagram of the installation of the pre-evaporator;

[0025] Figure 8 This is a schematic diagram of the regulator's structure;

[0026] The components include: 1. Cooling fan; 2. Condenser; 5. Pre-evaporator; 6. Plate heat exchanger; 7. Temperature sensor; 8. Compressor; 9. Cooling container; 10. Solenoid valve; 11. Cooling medium supply device; 12. Coil evaporator; 14. First capillary tube; 15. Second capillary tube; 16. Third capillary tube; 17. Refrigerant cooling pipeline; 18. Refrigerant return main pipe; 22. Liquid level balance pipe; 29. ​​Refrigerant cooling device; 30. Coil evaporator refrigerant pipeline; 31. Coil evaporator inlet connecting pipe; 32. Coil evaporator outlet connecting pipe; 33. First refrigerant passage; 34. Heat exchange chamber; 35. Coil; 40. Pre-evaporator. 41. Evaporator refrigerant piping; 42. Pre-evaporator inlet connecting pipe; 43. Pre-evaporator outlet connecting pipe; 44. Third refrigerant passage; 45. Pre-ventilation passage; 46. Bend pipe; 50. Guide plate; 51. Plate heat exchanger refrigerant piping; 52. Cooling medium inlet pipe; 53. Cooling medium return pipe; 54. Plate heat exchanger inlet connecting pipe; 55. Plate heat exchanger outlet connecting pipe; 56. Second refrigerant passage; 60. Regulator; 61. Outer shell; 62. Regulating passage; 63. Fan blade; 71. Condenser inlet connecting pipe; 72. Condenser outlet connecting pipe; 73. Condensation passage. Detailed Implementation

[0027] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0028] like Figure 1-8As shown, a compressor cooling system for a laser chiller includes a compressor 8, a refrigerant cooling device 29, refrigerant lines for a coil evaporator 30, refrigerant lines for a pre-evaporator 40, refrigerant lines for a plate heat exchanger 50, a cooling container 9, and a cooling medium supply device 11. The refrigerant lines for the coil evaporator 30, the pre-evaporator 40, and the plate heat exchanger 50 are all connected to the inlet of the compressor 8, and the outlet of the compressor 8 is connected to the refrigerant cooling device 29. The refrigerant lines for the coil evaporator 30, the pre-evaporator 40, and the plate heat exchanger 50 are all connected to the refrigerant cooling device 29. The refrigerant pipeline 50 includes a plate heat exchanger 6, which is provided with a cooling medium channel 51. One end of the cooling medium channel 51 is connected to a cooling medium inlet pipe 52, and the other end of the cooling medium channel 51 is connected to a cooling medium return pipe 53. The compressor 8 is located inside the cooling container 9, and the cooling medium supply device 11 is used to supply liquid cooling medium to the cooling container 9. The cooling medium inlet pipe 52 is connected to the cooling container 9, and the cooling medium inlet pipe 52 is used to allow gaseous cooling medium, which has absorbed heat from the compressor 8 and formed into a gaseous state, to flow in. The cooling medium return pipe 53 is connected to the cooling container 9.

[0029] In operation, the refrigerant returning from the coil evaporator refrigerant line 30, the pre-evaporator refrigerant line 40, and the plate heat exchanger refrigerant line 50 enters the compressor 8. After isentropic compression by the compressor 8, it becomes a high-temperature and high-pressure refrigerant. This high-temperature and high-pressure refrigerant enters the refrigerant cooling device 29 from the outlet of the compressor 8. After being cooled in the refrigerant cooling device 29, it enters the coil evaporator refrigerant line 30, the pre-evaporator refrigerant line 40, and the plate heat exchanger refrigerant line 50 for heat exchange. After heat exchange, it enters the compressor 8 again from the coil evaporator refrigerant line 30, the pre-evaporator refrigerant line 40, and the plate heat exchanger refrigerant line 50, and then continues to work in the above manner in a continuous cycle. During use, liquid cooling medium can be supplied to the cooling container 9 through the cooling medium supply device 11. When the ambient temperature is high (above 45°C), the liquid cooling medium in the cooling container 9 can quickly absorb the heat generated by the compressor 8 during operation, undergo a phase change, and vaporize. This causes the cooling medium to boil and transfer heat to the surface of the compressor 8 shell, thus providing comprehensive cooling to the surface of the compressor 8 shell. The gaseous cooling medium, after absorbing heat and vaporizing, enters the plate heat exchanger 6 through the cooling medium entry pipe 52 to exchange heat with the refrigerant. After the cooling medium temperature decreases, it enters the cooling medium return pipe 53 from the plate heat exchanger 6, and then returns to the cooling container 9 through the cooling medium return pipe 53. Therefore, the compressor cooling system of the laser chiller provided by the present invention combines a compressor 8, a refrigerant cooling device 29, a coil evaporator refrigerant line 30, a pre-evaporator refrigerant line 40, a plate heat exchanger refrigerant line 50, a cooling container 9, and a cooling medium supply device 11. By placing the compressor 8 inside the cooling container 9, the cooling medium supply device 11 supplies cooling medium to the cooling container 9. The liquid cooling medium, along with the plate heat exchanger 6 used in the refrigerant piping 50, allows the cooling medium channel 51 to receive the gaseous cooling medium that has absorbed heat from the compressor 8. This enables the cooling medium in the cooling container 9 to rapidly absorb heat and vaporize when the compressor 8 is operating at a relatively high ambient temperature (45-55°C). This vaporization causes boiling heat transfer between the cooling medium and the compressor 8 casing surface, resulting in rapid cooling of the compressor 8. Furthermore, the cooling medium can enter the plate heat exchanger 6 for heat exchange with the refrigerant. The cooling medium, after cooling, returns to the cooling container 9 through the cooling medium return pipe 53, so that the compressor 8 can be continuously cooled in the cooling container 9 when it is working. Therefore, the heat dissipation effect of the compressor 8 can be improved, and the compressor 8 can be prevented from shutting down due to thermal protection at high operating ambient temperature (45-55℃). The compressor 8 malfunctions are reduced, and the compressor 8 can work stably at high operating ambient temperature (45-55℃), so that it can meet the usage requirements of more different operating ambient temperatures and expand its applicable operating ambient temperature range.

[0030] The refrigerant cooling device 29 includes a refrigerant cooling pipe 17, on which a condenser 2 is installed, and the refrigerant cooling pipe 17 is connected to the outlet of the compressor 8; the coil evaporator refrigerant pipe 30, the pre-evaporator refrigerant pipe 40, and the plate heat exchanger refrigerant pipe 50 are respectively connected to the refrigerant cooling pipe 17.

[0031] The refrigerant cooling device 29 also includes a cooling fan 1, which is used to generate airflow through the condenser 2. The refrigerant, which has been isentropically compressed by the compressor 8 to form a high-temperature and high-pressure refrigerant, enters the refrigerant cooling pipe 17 from the outlet of the compressor 8 and enters the condenser 2 along the refrigerant cooling pipe 17. At this time, the cooling fan 1 works to drive the airflow to form an airflow (i.e., wind). The airflow generated by the cooling fan 1 flows through the condenser 2, so that the heat of the refrigerant can be carried away by the flowing airflow, so that the high-temperature and high-pressure refrigerant is cooled in the condenser 2. The cooled refrigerant enters the coil evaporator refrigerant pipe 30, the pre-evaporator refrigerant pipe 40, and the plate heat exchanger refrigerant pipe 50 along the refrigerant cooling pipe 17 respectively.

[0032] The condenser 2 on the refrigerant cooling pipe 17 can be any commercially available condenser. In a preferred embodiment of the invention, the condenser 2 can be a microchannel condenser to improve heat exchange efficiency and significantly increase the system's energy efficiency ratio. The condenser 2 has multiple condensing ventilation channels through which airflow passes. The airflow generated by the cooling fan 1 exchanges heat with the high-temperature, high-pressure refrigerant flowing through the condenser 2 via these condensing ventilation channels.

[0033] Preferably, the refrigerant cooling pipeline 17 further includes a condenser inlet connecting pipe 71 and a condenser outlet connecting pipe 72. The condenser 2 forms a condensation channel 73. One end of the condenser inlet connecting pipe 71 is connected to the compressor 8 outlet, and the other end is connected to the condensation channel 73. The condenser outlet connecting pipe 72 is connected to the condensation channel 73. The coil evaporator refrigerant pipeline 30, the pre-evaporator refrigerant pipeline 40, and the plate heat exchanger refrigerant pipeline 50 are respectively connected to the condenser outlet connecting pipe 72. During use, the refrigerant isentropically cooled by the compressor 8. After compression, the refrigerant, which is now at high temperature and high pressure, enters the condenser inlet connecting pipe 71 from the outlet of the compressor 8, and then enters the condensing channel 73 of the condenser 2 from the condenser inlet connecting pipe 71. At this time, the airflow generated by the working of the cooling fan 1 flows through the condenser 2, so that the heat of the refrigerant can be carried away by the flowing airflow, so that the high temperature and high pressure refrigerant is cooled in the condenser 2. After cooling, the refrigerant enters the coil evaporator refrigerant line 30, the pre-evaporator refrigerant line 40, and the plate heat exchanger refrigerant line 50 along the condenser outlet connecting pipe 72.

[0034] The compressor 8 is connected to the refrigerant return main pipe 18 at its inlet. The refrigerant lines 30 of the coil evaporator, 40 of the pre-evaporator, and 50 of the plate heat exchanger are connected to the inlet of the compressor 8 through the refrigerant return main pipe 18 for easy connection.

[0035] Preferably, the refrigerant pipeline 30 of the coil evaporator includes a coil evaporator 12. The coil evaporator refrigerant pipeline 30 also includes a coil evaporator inlet connecting pipe 31 and a coil evaporator outlet connecting pipe 32. The coil evaporator 12 forms a first refrigerant channel 33. One end of the coil evaporator inlet connecting pipe 31 is connected to the refrigerant cooling pipeline 17, and the other end is connected to the first refrigerant channel 33. One end of the coil evaporator outlet connecting pipe 32 is connected to the first refrigerant channel 33, and the other end is connected to the refrigerant return main pipe 18. The coil evaporator 12 is also provided with a heat exchange chamber 34. The refrigerant flowing from the refrigerant cooling pipeline 17 to the coil evaporator inlet connecting pipe 31 after cooling can enter the first refrigerant channel 33 of the coil evaporator 12 from the coil evaporator inlet connecting pipe 31, and then enter the refrigerant return main pipe 18 via the coil evaporator outlet connecting pipe 32, and then enter the compressor 8 from the refrigerant return main pipe 18. When the refrigerant passes through the first refrigerant channel 33 of the coil evaporator 12, it can exchange heat with the heat exchange object in the heat exchange chamber 34. Specifically, the coil evaporator 12 includes a coil 35, the first refrigerant channel 33 is formed on the coil 35, and the coil 35 is located inside the heat exchange chamber 34. The inlet connecting pipe 31 of the coil evaporator is connected to the condenser outlet connecting pipe 72 of the refrigerant cooling pipe 17.

[0036] Preferably, the coil evaporator inlet connecting pipe 31 includes a first capillary tube 14, allowing the refrigerant to be throttled and depressurized through the first capillary tube 14 before flowing into the coil evaporator 12 for heat exchange. The coil evaporator inlet connecting pipe 31 also includes a first pipe body, which connects the first capillary tube 14 and the coil evaporator 12.

[0037] Preferably, the plate heat exchanger refrigerant pipeline 50 further includes a plate heat exchanger inlet connecting pipe 54 and a plate heat exchanger outlet connecting pipe 55. The plate heat exchanger 6 forms a second refrigerant channel 56. One end of the plate heat exchanger inlet connecting pipe 54 is connected to the refrigerant cooling pipeline 17, and the other end is connected to the second refrigerant channel 56. One end of the plate heat exchanger outlet connecting pipe 55 is connected to the second refrigerant channel 56, and the other end is connected to the refrigerant return main pipe 18. The refrigerant flowing from the refrigerant cooling pipeline 17 to the plate heat exchanger inlet connecting pipe 54 after cooling can enter the second refrigerant channel 56 of the plate heat exchanger 6 from the plate heat exchanger inlet connecting pipe 54, and then enter the refrigerant return main pipe 18 through the plate heat exchanger outlet connecting pipe 55, and then enter the compressor 8 from the refrigerant return main pipe 18. When the refrigerant passes through the second refrigerant channel 56 of the plate heat exchanger 6, it can exchange heat with the cooling medium flowing through the cooling medium channel 51 within the plate heat exchanger 6 by means of heat transfer. The inlet connecting pipe 54 of the plate heat exchanger is connected to the condenser outlet connecting pipe 72 of the refrigerant cooling pipeline 17.

[0038] Preferably, the plate heat exchanger inlet connecting pipe 54 includes a second capillary tube 15, allowing the refrigerant to be throttled and depressurized through the second capillary tube 15 into a low-temperature liquid refrigerant before flowing into the plate heat exchanger 6 for heat exchange. The plate heat exchanger inlet connecting pipe 54 also includes a second pipe body, which connects the second capillary tube 15 and the plate heat exchanger 6.

[0039] The second refrigerant channel 56 is connected to the plate heat exchanger inlet connecting pipe 54 at one end, forming the refrigerant inlet end, and connected to the plate heat exchanger outlet connecting pipe 55 at the other end, forming the refrigerant outlet end. The cooling medium channel 51 is connected to the cooling medium inlet pipe 52 at one end, forming the cooling medium inlet end, and connected to the cooling medium return pipe 53 at the other end, forming the cooling medium outlet end. This allows the refrigerant and high-temperature cooling medium in the process plate heat exchanger 6 to flow in opposite directions, thereby achieving better heat exchange efficiency.

[0040] Preferably, the pre-evaporator refrigerant pipeline 40 includes a pre-evaporator 5. The pre-evaporator refrigerant pipeline 40 further includes a pre-evaporator inlet connecting pipe 41 and a pre-evaporator outlet connecting pipe 42. The pre-evaporator 5 forms a third refrigerant channel 43. One end of the pre-evaporator inlet connecting pipe 41 is connected to the refrigerant cooling pipeline 17, and the other end is connected to the third refrigerant channel 43. One end of the pre-evaporator outlet connecting pipe 42 is connected to the third refrigerant channel 43, and the other end is connected to the refrigerant return main pipe 18. The pre-evaporator 5 also forms a pre-ventilation channel 44. The refrigerant flowing from the refrigerant cooling pipeline 17 to the pre-evaporator inlet connecting pipe 41 after cooling can enter the third refrigerant channel 43 of the pre-evaporator 5 from the pre-evaporator inlet connecting pipe 41, and then enter the refrigerant return main pipe 18 via the pre-evaporator outlet connecting pipe 42, and then enter the compressor 8 from the refrigerant return main pipe 18. The refrigerant can exchange heat with the heat exchange object flowing through the pre-ventilation channel 44 via the third refrigerant channel 43 of the pre-evaporator 5. Preferably, the pre-ventilation channel 44 is used for the airflow generated by the cooling fan 1 to flow through, so that the airflow generated by the cooling fan 1 can flow through the pre-ventilation channel 44 and exchange heat with the refrigerant flowing through the third refrigerant channel 43 to achieve a cooling effect. The cooled airflow then flows through the condenser 2, which can carry away the heat of the refrigerant flowing through the condenser 2, thereby reducing the condensing pressure, reducing the current of the compressor 8, and also reducing the exhaust temperature of the compressor 8.

[0041] Preferably, the pre-evaporator inlet connecting pipe 41 includes a third capillary tube 16, allowing the refrigerant to be depressurized and throttled through the third capillary tube 16 before flowing into the pre-evaporator 5 for heat exchange. The pre-evaporator inlet connecting pipe 41 also includes a third pipe body, which connects the third capillary tube 16 and the pre-evaporator 5.

[0042] The pre-evaporator 5 includes a bent pipe 45, and the third refrigerant channel 43 is formed on the bent pipe 45. The pre-evaporator 5 also includes a plurality of guide plates 46 connected to the bent pipe 45. The pre-ventilation channel 44 is formed between any two adjacent guide plates 46, so that the airflow flowing through the pre-ventilation channel 44 can exchange heat with the refrigerant in the third refrigerant channel 43 through the pipe wall of the bent pipe 45.

[0043] The effective air intake space of all the pre-ventilation channels 44 of the pre-evaporator 5 is larger than the effective air intake space of all the condenser ventilation channels of the condenser 2.

[0044] Preferably, an regulator 60 may be provided between the pre-evaporator 5 and the condenser 2. The regulator 60 includes a housing 61; a plurality of adjustment channels 62 are sequentially arranged inside the housing 61, and a fan blade 63 is pivotally connected to each adjustment channel 62. The regulator 60 also includes a drive device. The rotation axis of each fan blade 63 constitutes a first axis, and the surface passing through the first axis and parallel to the front wall of each adjustment channel 62 constitutes an adjustment reference surface. The drive device is used to drive each fan blade 63 to rotate between a first position and a second position of the corresponding adjustment channel 62. The fan blade 63 is located at the opposite... When the first position of the adjustment channel 62 is adjusted, the angle between the fan blade 63 and the adjustment reference plane is 30-45°. When the fan blade 63 is in the second position of the corresponding adjustment channel 62, the fan blade 63 is parallel to the front wall of the corresponding adjustment channel 62. In use, when the fan blade 63 is driven to rotate synchronously to the first position by the drive device, the ventilation volume can be reduced to decrease the airflow through the condenser 2. When the fan blade 63 is driven to rotate synchronously to the second position by the drive device, the ventilation volume can be increased to increase the airflow through the condenser 2. Thus, the cooling effect of the refrigerant can be adjusted according to the refrigerant flow rate and other conditions in the condenser 2.

[0045] The drive device can be any existing drive device on the market, as long as it can drive the fan blades 63 in the multiple adjustment channels 62 to rotate. For example, it can include multiple driven wheels, driving wheels, transmission belts and motors that correspond one-to-one with the multiple fan blades 63; the motor is used to drive the driving wheel to rotate; the driven wheel is fixed on the corresponding fan blade 63, and the transmission belt is wound around the multiple driven wheels and driving wheel.

[0046] The compressor 8 is located inside the cooling container 9 and immersed in a liquid cooling medium. The cooling medium is a fluorinated liquid. The boiling point of the fluorinated liquid is 76°C, and its thermal conductivity is 0.069 W / (mK). By using a fluorinated liquid as the cooling medium, when the compressor 8 is running, after the surface temperature of the compressor 8 casing rises to 76°C, the fluorinated liquid absorbs heat and vaporizes, undergoing a phase change. The fluorinated liquid then boils and transfers heat to the surface of the compressor 8 casing, thereby cooling the compressor 8 and improving the cooling effect.

[0047] Of course, the cooling medium can be any commercially available fluorinated liquid. More preferably, the cooling medium is an electronic fluorinated liquid, which has low viscosity and excellent electrical insulation and thermal conductivity. In some embodiments, the electronic fluorinated liquid can be 3M's Novec 7200 model electronic fluorinated liquid.

[0048] The upper end of the cooling container 9 is connected to the upper end of the cooling medium supply device 11 via a liquid level balance pipe 22, and a solenoid valve 10 is installed between the lower end of the cooling container 9 and the lower end of the cooling medium supply device 11. The compressor cooling system of this laser chiller also includes an exhaust temperature sensor 7, which is installed on the condenser inlet connecting pipe 71 and is used to detect the temperature of the gaseous refrigerant discharged from the compressor 8. When the exhaust temperature sensor 7 detects that the temperature of the gaseous refrigerant discharged from the compressor 8 is greater than 110°C, the solenoid valve 10 opens. In this embodiment, the distance between the liquid level balance pipe 22 and the top of the cooling container 9 is 100mm. After adding liquid cooling medium, the highest liquid level of the cooling medium supply device 11 and the cooling container 9 is flush with the liquid level balance pipe 22. The section of the cooling container 9 above the liquid level balance pipe 22 forms an upper section, which facilitates the evaporation of the fluorinated liquid and reduces the gas pressure of the fluorinated liquid. When the ambient temperature is high and the laser chiller is operating under high load, the fluorinated liquid in the cooling container 9 evaporates rapidly, causing the liquid level to drop. This reduces the heat dissipation capacity of the compressor 8 casing and raises the exhaust temperature. When the exhaust temperature sensor 7 detects that the temperature of the gaseous refrigerant discharged from the compressor 8 is greater than 110°C, the solenoid valve 10 automatically opens, allowing liquid fluorinated liquid to flow from the cooling medium supply device 11 to the cooling container 9. This replenishes the cooling container 9 with sufficient fluorinated liquid to cool the compressor 8, improving the heat dissipation capacity of the compressor 8 surface, reducing the exhaust temperature, exhaust pressure, and operating current of the compressor 8, and ensuring the continuous operation of the compressor 8. When the exhaust temperature sensor 7 detects that the temperature of the gaseous refrigerant discharged from the compressor 8 is less than 110°C, the solenoid valve 10 automatically closes. When the ambient temperature is low and the system is under low load, the fluorinated liquid in the cooling container 9 evaporates slowly and can flow back to the cooling medium supply device 11 through the liquid level balance pipe 22. In this embodiment, the cooling medium supply device 11 includes a storage tank for storing the fluorinated liquid.

[0049] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A compressor cooling system for a laser chiller, characterized in that: The system includes a compressor, a refrigerant cooling device, refrigerant piping for a coil evaporator, refrigerant piping for a pre-evaporator, refrigerant piping for a plate heat exchanger, a cooling container, and a cooling medium supply device. The refrigerant piping for the coil evaporator, pre-evaporator, and plate heat exchanger are all connected to the compressor inlet, and the compressor outlet is connected to the refrigerant cooling device. The refrigerant piping for the coil evaporator, pre-evaporator, and plate heat exchanger are each connected to the refrigerant cooling device. The plate heat exchanger refrigerant piping includes a plate heat exchanger. The plate heat exchanger is provided with a cooling medium channel; one end of the cooling medium channel is connected to a cooling medium inlet pipe, and the other end of the cooling medium channel is connected to a cooling medium return pipe; the compressor is located inside the cooling container, and the cooling medium supply device is used to supply liquid cooling medium to the cooling container; the cooling medium inlet pipe is connected to the cooling container, and the cooling medium inlet pipe is used to allow gaseous cooling medium, which has absorbed heat from the compressor and formed into a gaseous state, to flow in; the cooling medium return pipe is connected to the cooling container.

2. The compressor cooling system of the laser chiller as described in claim 1, characterized in that: The refrigerant cooling device includes a refrigerant cooling pipeline, on which a condenser is installed; the refrigerant cooling pipeline is connected to the outlet of the compressor; the refrigerant pipelines of the coil evaporator, the pre-evaporator, and the plate heat exchanger are respectively connected to the refrigerant cooling pipeline.

3. The compressor cooling system of the laser chiller as described in claim 2, characterized in that: The condenser is a microchannel condenser.

4. The compressor cooling system of the laser chiller as described in claim 2, characterized in that: The refrigerant cooling device also includes a cooling fan, which is used to generate airflow through the condenser.

5. The compressor cooling system of the laser chiller as described in any one of claims 1-3, characterized in that: The compressor inlet is connected to a refrigerant return main pipe, and the refrigerant lines of the coil evaporator, the pre-evaporator, and the plate heat exchanger are respectively connected to the compressor inlet through the refrigerant return main pipe.

6. The compressor cooling system of the laser chiller as described in any one of claims 1-3, characterized in that: The refrigerant piping of the coil evaporator includes a coil evaporator; the refrigerant piping of the pre-evaporator includes a pre-evaporator.

7. The compressor cooling system of the laser chiller as described in any one of claims 1-3, characterized in that: The cooling medium is a fluorinated liquid.

8. The compressor cooling system of the laser chiller as described in any one of claims 1-3, characterized in that: The compressor is located inside a cooling container and is immersed in a liquid cooling medium.

9. The compressor cooling system of the laser chiller as described in claim 1, characterized in that: The upper end of the cooling container is connected to the upper end of the cooling medium supply device via a liquid level balance pipe.

10. The compressor cooling system of the laser chiller as described in claim 1 or 9, characterized in that: A solenoid valve is provided between the lower end of the cooling container and the lower end of the cooling medium supply device. The compressor cooling system of the laser chiller also includes an exhaust temperature sensor, which is used to detect the temperature of the refrigerant discharged from the compressor. When the exhaust temperature sensor detects that the temperature of the refrigerant discharged from the compressor is greater than 110°C, the solenoid valve opens.

Images