Refrigerating system for laser cooling machine

Abstract

The refrigerating system comprises a compressor, a condenser, an evaporator and an electronic expansion valve, an air outlet of the compressor is communicated with the inlet end of an oil separator through a first connecting pipe, and the outlet end of the oil separator is communicated with the inlet end of the condenser through a connecting pipe; the outlet end of the condenser is communicated with the inlet end of a high-pressure storage tank through a fourth connecting pipe, the outlet end of the high-pressure storage tank is communicated with the inlet end of an electronic expansion valve through a connecting pipe, the outlet end of the electronic expansion valve is communicated with the inlet end of a first electromagnetic valve through a connecting pipe, and the outlet end of the first electromagnetic valve is communicated with the inlet end of an evaporator; the control box to be cooled is directly fixed on the wall plate of the evaporator, direct contact heat exchange is achieved through the evaporator, intermediate medium heat exchange is not needed, the heat exchange effect is greatly improved, meanwhile, when the laser equipment is not used, a refrigerant of the compressor can conduct self-circulation and does not participate in refrigeration, and therefore energy consumption is reduced, and the energy-saving effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and more particularly to a refrigeration system for a laser cooling machine. Background Art

[0002] Existing laser cooling equipment generally uses a laser chiller, also known as a fiber laser chiller. The fiber laser chiller consists of a compressor, condenser, throttling device (expansion valve or capillary tube), evaporator and water pump. Its working principle is that the chiller's refrigeration system cools the water, and the water pump sends the low-temperature cooling water to the equipment that needs to be cooled. The cooling water takes away the heat, heats up and flows back to the chiller, and is cooled again before being sent back to the equipment.

[0003] It needs to first cool the cold water by heat exchange, and then exchange heat with the wall of the control box where the laser equipment's control motherboard is located through water-cooling heat exchange to reduce the heat of the control box and its internal control motherboard and electrical components thereon to ensure its normal operation. However, it needs to use a water-cooled intermediate medium to achieve heat exchange, which greatly reduces the heat exchange rate and has a poor cooling effect. At the same time, when the laser equipment is not in use, the temperature of the electrical components on the control motherboard is not high. At this time, it does not require long-term cooling. Existing cooling machines all require long-term cooling, which consumes a lot of energy and has poor energy-saving effects. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a refrigeration system for a laser cooling machine, which directly fixes the control box to be cooled on the wall panel of the evaporator, and directly exchanges heat through the evaporator without the need for an intermediate medium for heat exchange, thereby greatly improving the heat exchange effect. At the same time, when the laser equipment is not in use, the refrigerant of the compressor can self-circulate and not participate in refrigeration, thereby reducing energy consumption and achieving good energy-saving effects.

[0005] The solution of the present invention to the technical problem is: A refrigeration system for a laser cooling machine comprises a compressor, a condenser, an evaporator and an electronic expansion valve, wherein an air outlet of the compressor is connected to an inlet end of an oil separator through a first connecting pipe, an outlet end of the oil separator is connected to an inlet end of a condenser through a connecting pipe, an outlet end of the condenser is connected to an inlet end of a high-pressure storage tank through a fourth connecting pipe, an outlet end of the high-pressure storage tank is connected to an inlet end of the electronic expansion valve through a connecting pipe, an outlet end of the electronic expansion valve is connected to an inlet end of a first solenoid valve through a connecting pipe, an outlet end of the first solenoid valve is connected to an inlet end of an evaporator, an outlet end of the evaporator is connected to an inlet end of a sixth solenoid valve through a connecting pipe, an outlet end of the sixth solenoid valve is connected to an inlet end of a negative pressure storage tank through a connecting pipe, an outlet end of the negative pressure storage tank is connected to an inlet end of a second one-way valve through a connecting pipe, and an outlet end of the second one-way valve is connected to a reflux port of the compressor through a second connecting pipe; The middle portion of the first connecting pipe and the middle portion of the second connecting pipe are connected through the third connecting pipe, and a fourth solenoid valve is installed in the middle portion of the third connecting pipe.

[0006] A first one-way valve is installed in the middle of the fourth connecting pipe, and the refrigerant flowing in the condenser enters the high-pressure storage tank through the first one-way valve.

[0007] The oil outlet of the oil separator is connected to one end of the first capillary tube, the other end of the first capillary tube is connected to the inlet of the fifth solenoid valve, and the outlet of the fifth solenoid valve is connected to the return port of the compressor through a connecting pipe.

[0008] The high-pressure storage tank is provided with a second outlet end, which is connected to the inlet end of the first solenoid valve through a fifth connecting pipe. A second solenoid valve is provided in the middle of the fifth connecting pipe. The second solenoid valve controls the refrigerant flowing out of the second outlet end of the high-pressure storage tank to enter the first solenoid valve.

[0009] The outstanding effects of the present invention are: Compared with the existing technology, it fixes the control mainboard to be cooled directly on the evaporator, and exchanges heat through direct contact with the evaporator without the need for an intermediate medium for heat exchange, greatly improving the heat exchange effect. At the same time, when the laser equipment is not in use, the refrigerant of the compressor can self-circulate and not participate in refrigeration, thereby reducing energy consumption and achieving good energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a simplified schematic diagram of the principle of the present invention; Figure 2 It is a partial structural schematic diagram of the evaporator of the present invention; Figure 3 It is a partial cross-sectional view of the evaporator; Figure 4 It is a partial structural diagram of the evaporator and the control box; Figure 5 It is a partial cross-sectional view of the oil separator. DETAILED DESCRIPTION

[0011] For example, see Figures 1 to 5As shown, a refrigeration system for a laser cooling machine includes a compressor 10, a condenser 20, an evaporator 30 and an electronic expansion valve 40. The air outlet of the compressor 10 is connected to the inlet end of an oil separator 50 through a first connecting pipe 1, the outlet end of the oil separator 50 is connected to the inlet end of the condenser 20 through a connecting pipe, the outlet end of the condenser 20 is connected to the inlet end of a high-pressure storage tank 60 through a fourth connecting pipe 4, the outlet end of the high-pressure storage tank 60 is connected to the inlet end of the electronic expansion valve 40 through a connecting pipe, and the electronic expansion valve 40 is connected to the inlet end of the electronic expansion valve 40. The outlet end of the expansion valve 40 is connected to the inlet end of the first solenoid valve 11 through a connecting pipe, the outlet end of the first solenoid valve 11 is connected to the inlet end of the evaporator 30, the outlet end of the evaporator 30 is connected to the inlet end of the sixth solenoid valve 16 through a connecting pipe, the outlet end of the sixth solenoid valve 16 is connected to the inlet end of the negative pressure storage tank 70 through a connecting pipe, the outlet end of the negative pressure storage tank 70 is connected to the inlet end of the second one-way valve 42 through a connecting pipe, and the outlet end of the second one-way valve 42 is connected to the reflux port of the compressor 10 through the second connecting pipe 2. The middle part of the first connecting pipe 1 and the middle part of the second connecting pipe 2 are connected through the third connecting pipe 3. A fourth solenoid valve 14 is installed in the middle part of the third connecting pipe 3. The fourth solenoid valve 14 is used to control the refrigerant in the first connecting pipe 1 to flow back into the second connecting pipe 2.

[0012] Furthermore, a first one-way valve 41 is installed in the middle of the fourth connecting pipe 4 , and the refrigerant flowing in the condenser 20 enters the high-pressure storage tank 60 through the first one-way valve 41 .

[0013] The oil outlet end of the oil separator 50 is connected to one end of the first capillary tube 80, the other end of the first capillary tube 80 is connected to the inlet end of the fifth solenoid valve 15, and the outlet end of the fifth solenoid valve 15 is connected to the reflux port of the compressor 10 through a connecting pipe. In the accompanying drawings, the outlet end of the fifth solenoid valve 15 is connected to the middle part of the second connecting pipe 2 through a connecting pipe. At the same time, the connection position of this connecting pipe is farther away from the reflux port of the compressor 10 than the connection position of the third connecting pipe 3 at the second connecting pipe 2.

[0014] Furthermore, the high-pressure storage tank 50 is provided with a second outlet, which is connected to the inlet of the first solenoid valve 11 via a fifth connecting pipe 5. A second solenoid valve 12 is provided in the middle of the fifth connecting pipe 5. The second solenoid valve 12 controls the refrigerant flowing out of the second outlet of the high-pressure storage tank 50 and entering the first solenoid valve 11. Specifically, the inlet of the first solenoid valve 11 is connected to a three-way connector, the corresponding end of the connecting pipe connected to the outlet of the electronic expansion valve 40 is connected to one end of the three-way connector, and the corresponding end of the fifth connecting pipe 5 is connected to the other end of the three-way connector.

[0015] Furthermore, the pressure relief port of the high-pressure storage tank 50 is connected to the inlet end of the third solenoid valve 13 through a connecting pipe, the outlet end of the third solenoid valve 13 is connected to one end of the second capillary tube 90, and the other end of the second capillary tube 90 is connected to the reflux port of the compressor 10. In the accompanying drawings, the other end of the second capillary tube 90 is connected to the second connecting pipe 2 through a connecting pipe, and flows back to the reflux port of the compressor 10 through the second connecting pipe 2.

[0016] Furthermore, a fourth temperature sensing device 94 is fixed on the outer wall of the connecting pipe connecting the oil separator 50 and the condenser 20, and the sensing end thereof is in close contact with the outer wall of the connecting pipe.

[0017] Furthermore, a third temperature sensing device 93 is fixed on the outer wall of the fourth connecting pipe 4 at one end close to the condenser 20, and the sensing end thereof is in close contact with the outer wall of the connecting pipe.

[0018] Furthermore, a second temperature sensing device 92 is fixed on the outer wall of the main body of the evaporator 30 , and the sensing end of the second temperature sensing device 92 is in close contact with the outer wall of the main body of the evaporator 30 .

[0019] Furthermore, a first temperature sensing device 91 is fixed on the outer wall of the connecting pipe connecting the outlet end of the evaporator 30 and the sixth solenoid valve 16, and the sensing end thereof is in close contact with the outer wall of the connecting pipe.

[0020] Furthermore, a side wall panel of the control box 100 to be cooled is fixed on the top surface of the main body of the evaporator 30 .

[0021] In this embodiment, the evaporator 30 and its related components are installed below the main chassis, while the remaining components are installed above a partition fixed in the middle of the main chassis. A fifth temperature sensor device 95 is installed in the main chassis above the partition.

[0022] All temperature sensing devices sense the temperature at the corresponding position. In this embodiment, except for the fifth temperature sensing device 95, the remaining temperature sensing devices are all temperature sensing packages. The fifth temperature sensing device 95 can adopt a thermistor sensor or other temperature sensor, which is mainly used to detect the temperature of its surrounding environment. These are all conventional structures and will not be described in detail here.

[0023] All electrical components used in this embodiment are electrically connected to the control host through electrical connection lines and are controlled by the control host. This is a conventional structure and will not be described in detail here.

[0024] The operating principle of this embodiment is as follows: Start the initial operation, the compressor 10 starts, the first solenoid valve 11 and the sixth solenoid valve 16 are opened, and the other solenoid valves are closed. At this time, the high-temperature and high-pressure refrigerant gas coming out of the compressor 10 first enters the oil separator 50, and the oil mixed in the gas (this oil is) is filtered to prevent it from entering the subsequent equipment, so that the oil adheres to the inner wall of the flow pipeline, reducing the heat exchange effect. The filtered refrigerant enters the condenser 20. A fan is provided on the outside of the condenser 20, which can speed up the heat exchange of the condenser 20, so that the refrigerant flowing therein is cooled and dissipated to become a high-temperature and high-pressure liquid (or a high-temperature and high-pressure gas-liquid mixed state), and then enters the high-pressure storage In the material tank 60, a pressure sensor is installed in the high-pressure storage tank 60, which can sense the pressure in the high-pressure storage tank 60. At this time, the refrigerant in the high-pressure storage tank 60 continues to increase, causing its pressure to increase. Then, the refrigerant overflowing from the high-pressure storage tank 60 is throttled by the electronic expansion valve 40 (the opening adjustment of the electronic expansion valve 40 at this time is approximately 300 steps), so that the refrigerant becomes a low-temperature, low-pressure liquid. Then, it enters the evaporator 30 through the first solenoid valve 11. At this time, the refrigerant absorbs heat and expands, thereby becoming a low-temperature, low-pressure gas. Then, it enters the negative pressure storage tank 70 through the sixth solenoid valve 16, and then flows back to the compressor 10 through the second one-way valve 42 and the second connecting pipe 2; During this process, the first temperature sensing device 91 and the second temperature sensing device 92 constantly sense the temperature and transmit it to the control host. When the temperature sensed by the first temperature sensing device 91 and the second temperature sensing device 92 reaches less than or equal to 15°, the temperature required for startup is reached. This process takes about 1 minute.

[0025] Then, the first solenoid valve 11 and the sixth solenoid valve 16 are closed, and the other solenoid valves are also closed. At this time, the compressor 10 will still output a large amount of refrigerant, and the refrigerant at this time enters the high-pressure storage tank 60 for storage. At the same time, the pressure sensor installed on the high-pressure storage tank 60 constantly senses the pressure in the high-pressure storage tank 60. When its pressure is greater than the pressure value set by the control host (generally 2 MPa), the corresponding third solenoid valve 13 opens to discharge the excess refrigerant in the high-pressure storage tank 60. It limits the flow and reduces the pressure of the discharged refrigerant through the second capillary tube 90, so that it can slowly flow back to the compressor 10 until the pressure sensed by the pressure sensor on the high-pressure storage tank 60 reaches the set value, and then the third solenoid valve 13 is closed; At this time, the refrigerant is still being recovered at the return port of the compressor 10, which causes the refrigerant in the negative pressure storage tank 70 to be continuously drawn out. The pressure sensor installed on the negative pressure storage tank 70 constantly senses the pressure of the negative pressure storage tank 70. When its pressure reaches the negative pressure value set by the control host (generally -0.5 MPa), it indicates that the negative pressure requirement has been met in the negative pressure storage tank 70 at this time. The values ​​of the two pressure sensors have reached the set values, indicating that the adjustment is in place (generally, when the negative pressure of the negative pressure storage tank 70 is reached, the high pressure of the high-pressure storage tank 60 has already been in place. If the high-pressure storage tank 60 is not in place and the negative pressure storage tank 70 is in place, it indicates that the refrigerant is insufficient and needs to be replenished. The replenishment can be carried out by connecting the filling port at the second connecting pipe 2 to the gaseous refrigerant. The replenishment method is a conventional structure and will not be described in detail here); At this time, the fourth temperature sensing device 94 is lower than 110°C, and then, the fourth solenoid valve 14 is opened. At this time, the refrigerant flowing out of the compressor 10 flows back to the compressor 10 through the third connecting pipe 3. Of course, a smaller part of the refrigerant may flow into the high-pressure storage tank 60, but due to the high pressure of the high-pressure storage tank 60, this part of the refrigerant cannot enter the high-pressure storage tank 60. Similarly, part of the refrigerant flowing back to the second connecting pipe 3 will flow to the negative pressure storage tank 70, and the second one-way valve 42 can prevent the refrigerant from flowing into the negative pressure storage tank 70.

[0026] At this time, the refrigerant in the compressor 10 is in a self-circulating flow, so that the compressor 10 reduces the compression frequency. At this time, the laser device controlled by the control box 100 to be cooled is not running.

[0027] At this time, the temperature sensed by the first temperature sensing device 91 and the second temperature sensing device 92 is less than or equal to 15°. When it is higher than 15°, the first solenoid valve 11 and the sixth solenoid valve 16 need to be opened, and the operation state is the same as the open state, until the temperature sensed by the first temperature sensing device 91 and the second temperature sensing device 92 reaches less than or equal to 15°, and then the first solenoid valve 11 and the sixth solenoid valve 16 are closed.

[0028] When the laser device is running, when it is turned on, the temperature rises rapidly. When the temperature sensed by the first temperature sensor 91 and the second temperature sensor 92 is greater than 15°C (when the laser device starts running, the temperature of the control box 100 will rise immediately, thereby transferring heat to the evaporator 30, so that the corresponding temperatures sensed by the first temperature sensor 91 and the second temperature sensor 92 rise rapidly. Generally, the temperature sensed by the second temperature sensor 92 rises earlier than that of the first temperature sensor 91), the first solenoid valve 11 and the sixth solenoid valve 16 are opened, and the other solenoid valves are closed. At this time, the refrigerant in the high-pressure storage tank 60 will immediately enter the electronic expansion valve 40. At the same time, the electronic expansion valve 40 is gradually opened at a speed of 5 steps per second (up to about 400 steps), so that the refrigerant can quickly pass through the electronic expansion valve 40 into the evaporator 30, thereby quickly cooling the control box 100, and the refrigerant passing through the evaporator 30 will quickly enter the negative pressure storage tank 70 (because the negative pressure storage tank 70 is at negative pressure, it can increase the flow rate of the refrigerant entering the negative pressure storage tank 70), thereby achieving rapid cooling, and the refrigerant when the compressor 10 is running at this time is still the same as when it is started for the initial operation, realizing the circulation flow of the refrigerant, and the refrigerant is continuously replenished into the high-pressure storage tank 60, and the refrigerant in the negative pressure storage tank 70 is continuously recovered by the compressor 10, realizing circulation flow and cooling.

[0029] When the laser equipment stops running, the first solenoid valve 11 and the sixth solenoid valve 16 are closed, and the operation is the same as when they are just turned on. At this time, the refrigerant is stored in the high-pressure storage tank 60, and the refrigerant in the negative pressure storage tank 70 is recovered by the compressor 10 until the fourth temperature sensing device 94 is lower than 110°C. Then, the fourth solenoid valve 14 is opened to allow the refrigerant flowing out of the compressor 10 to flow back into the compressor 10 through the third connecting pipe 3, realizing self-circulation, thereby reducing the compression frequency of the compressor 10 and achieving energy-saving operation.

[0030] The evaporator 30 in this embodiment is composed of two heat exchange shells, which are rectangular shells. A plurality of transverse guide plates 31 arranged from top to bottom are fixed inside each shell. The front and rear walls of all transverse guide plates 31 are welded and fixed to the front and rear inner walls of the shell. The left and right sides of the transverse guide plates 31 are welded and fixed to the inner walls of the left and right side plates of the shell. A guide hole 32 is formed at one end of all transverse guide plates 31. The guide holes 32 of each two adjacent transverse guide plates 31 are opposite to each other. The guide holes 32 of the upper transverse guide plate 31 are staggered, that is, the guide holes 32 of the lower transverse guide plate 31 are at its left end, and the guide holes 32 of the lower transverse guide plate 31 are at its right end, thus realizing an S-shaped flow channel. The inlet end is connected to the right side plate of the upper part of one shell, and the outlet end is connected to the right side plate of the upper part of the other shell. The inlet end and the outlet end are connected to the corresponding shell. The two heat exchange shells correspond to each other front and back. A connecting pipe 33 is fixed between the lower parts of the two heat exchange shells. The connecting pipe 33 is connected to the side flow through-holes formed on the opposite wall plates of the lower parts of the two shells. Multiple connecting blocks are fixed between the left and right portions of the two shells. The control box 100 to be cooled is located between the two shells, with its front and rear walls pressed against the opposing walls of the two shells and secured with thermally conductive adhesive. (Alternatively, the control motherboard in the control box 100 can be directly removed and bolted onto the wall of the corresponding shell, while the corresponding walls of the electronic components on it are secured to the outer walls of the corresponding shells with thermally conductive adhesive to achieve heat exchange.) A second temperature sensor 92 is fixed to the wall of one of the shells at the junction with the wall of the control box 100.

[0031] This structure increases the flow time of the refrigerant flowing in the evaporator 30 and can exchange heat through the walls of the two shells in contact with the control box 100, so that the control box 100 is quickly cooled down, and the control motherboard and other components inside it are quickly cooled down (the control motherboard is fixed to the inner wall surface of the front wall plate or the rear wall plate of the control box 100), and the heat exchange effect and the cooling effect are fast; At the same time, the structure of the oil separator 50 of the present embodiment is as follows: it includes a main tank body (the top plate of the main tank body is fixed to the top of the main body of the main tank body by welding), a vertical air intake connecting pipe 51 is connected to the top plate of the main tank body, the upper part of the vertical air intake connecting pipe 51 extends out of the top surface of the main tank body, which is the inlet end, the lower part of the vertical air intake connecting pipe 51 is close to the middle of the main tank body, the outer side wall of the vertical air intake connecting pipe 51 is welded and fixed to the inner side wall of the middle part of the top plate of the main tank body, the bottom of the vertical air intake connecting pipe 51 is connected to an air guide plate 52 (which can be welded and fixed), the inner cavity of the air guide plate 52 is connected to the vertical air intake connecting pipe 51, the edge of the bottom plate of the air guide plate 52 is formed with an oblique exhaust through-hole 53 extending obliquely outward, and the middle part of the bottom plate of the air guide plate 52 is formed with an intermediate through-hole 54, and a side plate of the upper part of the main tank body is connected to an exhaust connecting pipe 55 extending outward, and the part of the exhaust connecting pipe 55 extending out of the outer side wall of the main tank body is the outlet end; A spiral protrusion 56 is formed on the inner wall of the middle part of the main tank body, and a bottom annular plate 57 is clamped in the main tank body at the upper part of the spiral protrusion 56. The bottom surface of the bottom annular plate 57 is pressed against the top of the spiral protrusion 56, and the top surface of the bottom annular plate 57 is pressed against a metal filter block 58 formed by welding a plurality of filter metal mesh sheets stacked up and down. The outer side wall of the metal filter block 58 is tightly against the inner side wall of the main tank body, and the top surface of the metal filter block 58 is pressed against an upper annular block 59 made of a porous plate, and the outer side wall of the upper annular block 59 is tightly against or It is clamped on the inner side wall of the main tank body, and the top surface of the edge of the upper annular block 59 is formed with an upwardly extending sleeve portion, which is made of a porous plate (so as to ensure that the refrigerant can pass through the corresponding holes of the sleeve portion and be discharged from the exhaust connecting pipe 55). The outer side wall of the sleeve portion is close to the inner side wall of the main tank body, and its top end is pressed against the top surface of the edge of the top plate of the main tank body. A plurality of liquid drop holes are formed at the edge of the bottom annular plate 57, and an oil return connecting pipe is connected to the bottom plate of the main tank body. The bottom of the oil return connecting pipe extends out of the bottom surface of the bottom plate of the main tank body, which is the oil outlet end.

[0032] When the oil separator 50 is in use, it can eject the refrigerant from the compressor 10 from the oblique exhaust holes 53 and the middle hole 54 of the air guide plate 52. The refrigerant ejected from the oblique exhaust holes 53 will be sprayed onto the inner wall of the main tank body. The oil in the refrigerant will adhere to the inner wall of the main tank body and flow downward along the inner wall of the main tank body. Then, the refrigerant flows upward and passes through the metal filter block 58, where the oil in the refrigerant is solidified and cooled again, so that it is separated from the refrigerant. Finally, the refrigerant is discharged from the exhaust connecting pipe 55. The oil in the metal filter block 58 will drip downwards, and part of it will flow downwards along the inner wall of the main tank body. The spiral protrusion 56 can increase the contact area between the refrigerant and the inner wall of the main tank body, thereby further improving the oil separation effect. The separated oil will eventually flow out from the oil return connecting pipe, and then enter the first capillary tube 80. The flow rate is adjusted by the pressure reduction of the first capillary tube 80. Then, by opening the fifth solenoid valve 15, the oil will flow back to the compressor 10 along with part of the refrigerant, realizing reflux, and the separation effect is good.

[0033] The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention. The scope of patent protection of the present invention should be defined by the claims.

Claims

1. A refrigeration system for a laser cooling machine, comprising a compressor (10), a condenser (20), an evaporator (30) and an electronic expansion valve (40), characterized in that: The air outlet of the compressor (10) is connected to the inlet end of the oil separator (50) through the first connecting pipe (1), the outlet end of the oil separator (50) is connected to the inlet end of the condenser (20) through the connecting pipe, the outlet end of the condenser (20) is connected to the inlet end of the high-pressure storage tank (60) through the fourth connecting pipe (4), the outlet end of the high-pressure storage tank (60) is connected to the inlet end of the electronic expansion valve (40) through the connecting pipe, and the outlet end of the electronic expansion valve (40) is connected to the first solenoid valve (11) through the connecting pipe. The inlet end of the first solenoid valve (11) is connected to the inlet end of the evaporator (30), the outlet end of the evaporator (30) is connected to the inlet end of the sixth solenoid valve (16) through a connecting pipe, the outlet end of the sixth solenoid valve (16) is connected to the inlet end of the negative pressure storage tank (70) through a connecting pipe, the outlet end of the negative pressure storage tank (70) is connected to the inlet end of the second one-way valve (42) through a connecting pipe, and the outlet end of the second one-way valve (42) is connected to the reflux port of the compressor (10) through the second connecting pipe (2); The middle portion of the first connecting pipe (1) and the middle portion of the second connecting pipe (2) are connected via a third connecting pipe (3), and a fourth solenoid valve (14) is installed in the middle portion of the third connecting pipe (3).

2. A refrigeration system for a laser cooling machine according to claim 1, characterized in that: A first one-way valve (41) is installed in the middle of the fourth connecting pipe (4), and the refrigerant flowing in the condenser (20) enters the high-pressure storage tank (60) through the first one-way valve (41).

3. A refrigeration system for a laser cooling machine according to claim 1, characterized in that: The oil outlet end of the oil separator (50) is connected to one end of a first capillary tube (80), the other end of the first capillary tube (80) is connected to the inlet end of a fifth solenoid valve (15), and the outlet end of the fifth solenoid valve (15) is connected to the return port of the compressor (10) through a connecting pipe.

4. A refrigeration system for a laser cooling machine according to claim 1, characterized in that: The pressure relief port of the high-pressure storage tank (50) is connected to the inlet end of the third solenoid valve (13) through a connecting pipe, the outlet end of the third solenoid valve (13) is connected to one end of the second capillary tube (90), and the other end of the second capillary tube (90) is connected to the return port of the compressor (10).

5. The refrigeration system for a laser cooling machine according to claim 1, characterized in that: A fourth temperature sensing device (94) is fixed on the outer wall surface of the connecting pipe connecting the oil separator (50) and the condenser (20).

6. A refrigeration system for a laser cooling machine according to claim 2, characterized in that: A third temperature sensing device (93) is fixed on the outer wall of the fourth connecting pipe (4) at one end close to the condenser (20).

7. The refrigeration system for a laser cooling machine according to claim 1, characterized in that: A second temperature sensing device (92) is fixed on the outer wall of the main body of the evaporator (30).

8. The refrigeration system for a laser cooling machine according to claim 1, characterized in that: A first temperature sensing device (91) is fixed on the outer wall of the connecting pipe communicating between the outlet end of the evaporator (30) and the sixth solenoid valve (16).

9. The refrigeration system for a laser cooling machine according to claim 1, characterized in that: A side wall panel of the control box (100) to be cooled is fixed on the top surface of the main body of the evaporator (30).

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