Energy-saving laser cold water machine

Abstract

The application discloses an energy-saving laser cold water machine, which comprises a laser cooling water system, a cooling tower cooling water circulation system and a compression refrigeration loop system; when the temperature difference between the cooling tower cooling water temperature and the laser cooling water temperature is less than a preset threshold, the laser cooling water system and the compression refrigeration loop system are turned on to utilize refrigerant to exchange heat and cool the laser cooling water; the cooling tower cooling water circulation system and the compression refrigeration loop system are turned on; when the temperature difference between the cooling tower cooling water temperature and the laser cooling water temperature is greater than or equal to the preset threshold, the laser cooling water system and the cooling tower cooling water circulation system are turned on to utilize the cooling tower cooling water to directly exchange heat and cool the laser cooling water; and the compression refrigeration loop system stops running. The application can realize laser cooling water cooling, effectively reduce the operation time of the compressor, reduce energy consumption, achieve energy-saving effect, and effectively prolong the service life.

Description

Technical Field

[0001] This invention relates to the field of laser chillers, and more specifically to an energy-saving laser chiller. Background Technology

[0002] Existing laser cooling water is mainly used to lower the temperature of the laser cooling water so that it can be circulated back to the laser machine for further cooling. Existing laser chillers include a cooling tower, plate heat exchanger, compressor, and evaporator. In operation, the laser cooling water enters the evaporator, where it exchanges heat with the refrigerant to obtain cooler water at a lower temperature. The water is then pumped to the chiller outlet and returned to the laser for further cooling.

[0003] After exchanging heat with the cooling water in the evaporator, the refrigerant enters the compressor, where it is compressed into a high-temperature, high-pressure gas. The refrigerant then flows to the plate heat exchanger, where the cooling tower cools it down. After cooling, the refrigerant passes through a throttling device and returns to a low-temperature, low-pressure state before flowing back to the evaporator to exchange heat with the laser cooling water. This process is repeated in a cycle.

[0004] During the operation of a chiller, the compressor accounts for 85%-95% of the total power consumption. Since the compressor must follow the reverse Carnot cycle, there is a theoretical energy efficiency limit. As long as the compressor is running, irreversible losses in the compression process, motor heat loss, and mechanical friction loss cannot be avoided. Especially in transitional seasons and under low load conditions, the compressor frequently starts and stops or operates at low load, resulting in a sharp drop in energy efficiency and additional starting impact energy consumption. This leads to high energy consumption, energy waste, and equipment wear, seriously affecting the service life of the chiller. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide an energy-saving laser chiller that can reduce compressor operation, reduce energy consumption, and effectively extend the life of the chiller.

[0006] The objective of this invention is achieved through the following technical solution: An energy-saving laser chiller includes a laser cooling water system, a cooling tower cooling water circulation system, and a compression refrigeration circuit system; The laser cooling water system is used to supply laser cooling water circulation; the laser cooling water system is adapted to switch to a first laser cooling water circulation state or a second laser cooling water circulation state. The cooling tower cooling water circulation system is used to circulate the cooling tower cooling water; the cooling tower cooling water circulation system is adapted to switch to the first circulation state or the second circulation state of the cooling tower cooling water. The compression refrigeration circuit system is used to circulate refrigerant; the compression refrigeration circuit system includes a compressor. When the temperature difference between the cooling tower cooling water and the laser cooling water is less than a preset threshold, the laser cooling water system switches to the first flow state of laser cooling water, the cooling tower cooling water circulation system switches to the first flow state of cooling tower cooling water, and the laser cooling water system is connected to the compression refrigeration circuit system to use the refrigerant to exchange heat and cool the laser cooling water; the cooling tower cooling water circulation system is connected to the compression refrigeration circuit system to use the cooling tower cooling water to exchange heat and cool the refrigerant. When the temperature difference between the cooling tower cooling water and the laser cooling water is greater than or equal to a preset threshold, the laser cooling water system switches to the second flow state of laser cooling water, the cooling tower cooling water circulation system switches to the second flow state of cooling tower cooling water, and the laser cooling water system and the cooling tower cooling water circulation system are connected to each other so as to use the cooling tower cooling water to directly exchange heat and cool the laser cooling water; the compression refrigeration circuit system stops operating.

[0007] The compression refrigeration loop system includes an evaporator and a heat exchange condenser. The evaporator has a first cooling water heat exchange channel and a first refrigerant heat exchange channel. The heat exchange condenser has a first cooling water heat exchange channel. The cooling tower cooling water circulation system includes a plate heat exchanger. The plate heat exchanger has a second cooling water heat exchange channel and a second cooling water heat exchange channel. When the cooling tower cooling water circulation system switches to the first cooling water flow state, the cooling tower cooling water circulation system is connected to the first cooling water heat exchange channel of the heat exchange condenser. When the laser cooling water system switches to the first laser cooling water flow state, the laser cooling water system is connected to the first cooling water heat exchange channel of the evaporator. When the laser cooling water system switches to the second laser cooling water flow state, the laser cooling water system is connected to the second cooling water heat exchange channel of the plate heat exchanger. The laser cooling water system is equipped with a laser cooling water temperature measuring device for detecting the laser cooling water temperature. The cooling tower cooling water circulation system is equipped with a cooling tower cooling water temperature measuring device for detecting the cooling tower cooling water temperature.

[0008] The laser cooling water system includes a first cooling water return pipe, a second cooling water return pipe, a water storage device, a first cooling water inlet pipe, and a second cooling water inlet pipe. The first and second cooling water inlet pipes are respectively connected to the outlet of the laser machine. The first cooling water inlet pipe is connected to a first cooling water heat exchange channel. The first cooling water heat exchange channel is connected to the first cooling water return pipe. The second cooling water inlet pipe is connected to the second cooling water heat exchange channel. The second cooling water heat exchange channel is connected to the second cooling water return pipe through the water storage device. The first and second cooling water return pipes are respectively connected to the return port of the laser machine. The laser cooling water temperature measuring device includes a first temperature control solenoid valve and a second temperature control solenoid valve. The first temperature control solenoid valve is installed on the first cooling water inlet pipe. The second temperature control solenoid valve is installed on the second cooling water inlet pipe.

[0009] The water storage device includes a buffer tank and a first water pump; the inlet of the buffer tank is connected to a second cooling water heat exchange channel; the outlet of the buffer tank is connected to the inlet of the first water pump; and the outlet of the first water pump is connected to a second cooling water return pipeline.

[0010] The water storage device is equipped with a water tank temperature probe and a water tank heating rod. The water tank temperature probe is used to detect the temperature of the laser cooling water, and the water tank heating rod is used to heat the laser cooling water.

[0011] When the first temperature-controlled solenoid valve is open and the second temperature-controlled solenoid valve is closed, the laser cooling water system is in the first flow state of laser cooling water; when the second temperature-controlled solenoid valve is open and the first temperature-controlled solenoid valve is closed, the laser cooling water system is in the second flow state of laser cooling water.

[0012] The cooling tower cooling water circulation system includes a cooling tower, a first cooling water return pipe, a second cooling water return pipe, a first cooling water inlet pipe, and a second cooling water inlet pipe. The first and second cooling water inlet pipes are connected to the outlets of the cooling tower, respectively. The first cooling water inlet pipe is connected to the first cooling water return pipe via a first cooling water heat exchange channel. The second cooling water inlet pipe is connected to the second cooling water return pipe via a second cooling water heat exchange channel. The first and second cooling water return pipes are connected to the return outlet of the cooling tower. The cooling tower cooling water temperature measuring device includes a third temperature-controlled solenoid valve and a fourth temperature-controlled solenoid valve. The third temperature-controlled solenoid valve is installed on the first cooling water inlet pipe, and the fourth temperature-controlled solenoid valve is installed on the second cooling water inlet pipe.

[0013] When the third and fourth temperature-controlled solenoid valves are both open, the cooling tower cooling water circulation system is in the first flow state of cooling tower cooling water; when the fourth temperature-controlled solenoid valve is open and the third temperature-controlled solenoid valve is closed, the cooling tower cooling water circulation system is in the second flow state of cooling tower cooling water.

[0014] The compression refrigeration circuit also includes a compressor and a throttling device; the evaporator, compressor, heat exchange condenser and throttling device are arranged sequentially along the refrigerant flow direction.

[0015] The preset threshold is 3℃-7℃.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides an energy-saving laser chiller, which combines a laser cooling water system, a cooling tower cooling water circulation system, and a compression refrigeration loop system. The laser cooling water system is configured to switch between a first and a second flow state, and the cooling tower cooling water circulation system is also configured to switch between the first and second flow states. The state of the cooling tower cooling water circulation system can be switched based on the temperature difference between the cooling tower cooling water and the laser cooling water, thus achieving… Switching between compressor cooling mode and cooling tower direct water cooling mode allows for simultaneous cooling of the laser cooling water and effective reduction of compressor running time, thus lowering energy consumption and achieving energy-saving effects. Furthermore, reducing compressor running time also reduces potential sources of unit failure such as compressor wear, liquid slugging, surge, motor burnout, and lubricant failure, effectively extending the chiller's lifespan. In addition, the buffer water tank is equipped with a water temperature probe to detect the temperature and uses a water tank heating rod for rapid heating, improving the equipment's responsiveness and preventing the laser machine from operating abnormally due to excessively low laser cooling water temperature. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the working principle of the energy-saving laser chiller of the present invention. Figure 2 This is a schematic diagram of the structure of the energy-saving laser chiller of the present invention; Figure 3 This is a schematic diagram of the energy-saving laser chiller of the present invention from another perspective; Figure 4 This is a schematic diagram of the compressor refrigeration mode of the energy-saving laser chiller of the present invention; Figure 5 This is a schematic diagram of the direct cooling mode of the cooling tower in the energy-saving laser chiller of the present invention; Figure 6 This is a schematic diagram of the evaporator structure; Figure 7This is a schematic diagram of the buffer water tank. Among them, 10. Laser cooling water system; 11. First cooling water inlet pipe; 12. Second cooling water inlet pipe; 13. First cooling water return pipe; 14. Second cooling water return pipe; 15. Water storage device; 17. First temperature control solenoid valve; 18. Second temperature control solenoid valve; 19. Evaporator water temperature probe; 20. Evaporator heating rod; 21. Water tank water temperature probe; 22. Water tank heating rod; 30. Cooling tower cooling water circulation system; 31. Cooling tower; 32. First cooling water inlet pipe; 33. Second cooling water inlet pipe; 34. First cooling water return pipe; 35. Second cooling water return pipe. 36. Water pipes; 37. Third temperature control solenoid valve; 40. Fourth temperature control solenoid valve; 41. Compression refrigeration circuit system; 42. Evaporator; 43. First cooling water heat exchange channel; 44. First refrigerant heat exchange channel; 45. Compressor; 46. Heat exchange condenser; 47. First cooling water heat exchange channel; 51. Throttling device; 52. Laser cooling water temperature measuring device; 61. Cooling tower cooling water temperature measuring device; 62. Buffer water tank; 63. First water pump; 64. Second water pump; 65. Plate heat exchanger; 66. Second cooling water heat exchange channel; 71. Laser machine. Detailed Implementation

[0018] 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.

[0019] like Figure 1-7 As shown, an energy-saving laser chiller includes a laser cooling water system 10, a cooling tower cooling water circulation system 30, and a compression refrigeration circuit system 40. The laser cooling water system 10 is used to supply laser cooling water for circulation; the laser cooling water system 10 is adapted to switch to a first laser cooling water circulation state or a second laser cooling water circulation state. The cooling tower cooling water circulation system 30 is used to circulate the cooling tower cooling water; the cooling tower cooling water circulation system 30 is adapted to switch to the first circulation state of the cooling tower cooling water or the second circulation state of the cooling tower cooling water. The compression refrigeration circuit system 40 is used to circulate refrigerant; the compression refrigeration circuit system 40 includes a compressor 44. When the temperature difference between the cooling tower cooling water and the laser cooling water is less than a preset threshold, the laser cooling water system 10 switches to the first flow state of laser cooling water, the cooling tower cooling water circulation system 30 switches to the first flow state of cooling tower cooling water, the laser cooling water system 10 is connected to the compression refrigeration circuit system 40 to use the refrigerant to exchange heat and cool the laser cooling water; the cooling tower cooling water circulation system 30 is connected to the compression refrigeration circuit system 40 to use the cooling tower cooling water to exchange heat and cool the refrigerant. When the temperature difference between the cooling tower cooling water and the laser cooling water is greater than or equal to a preset threshold, the laser cooling water system 10 switches to the second flow state of laser cooling water, and the cooling tower cooling water circulation system 30 switches to the second flow state of cooling tower cooling water. The laser cooling water system 10 and the cooling tower cooling water circulation system 30 are connected to each other so that the cooling tower cooling water can directly exchange heat and cool the laser cooling water; the compression refrigeration circuit system 40 stops operating.

[0020] In use, when the temperature of the cooling tower cooling water is too high, causing the temperature difference between the cooling tower cooling water and the laser cooling water to be less than a preset threshold and insufficient for direct cooling, the laser cooling water system 10 is switched to the first flow state of the laser cooling water, the cooling tower cooling water circulation system 30 is switched to the first flow state of the cooling tower cooling water, the laser cooling water system 10 is connected to the compression refrigeration circuit system 40, and the laser cooling water flows through the compression refrigeration circuit system 40 to use the refrigerant to exchange heat and cool the laser cooling water. The cooling tower cooling water circulation system 30 is connected to the compression refrigeration circuit system 40, and the cooling tower cooling water flows through the compression refrigeration circuit system 40 to use the cooling tower cooling water to exchange heat and cool the refrigerant. When the temperature difference between the cooling tower cooling water and the laser cooling water is greater than or equal to a preset threshold, the laser cooling water system 10 is switched to the second flow state, and the cooling tower cooling water circulation system 30 is switched to the second flow state. The laser cooling water system 10 and the cooling tower cooling water circulation system 30 are connected, and the laser cooling water flows through the cooling tower cooling water circulation system 30. The cooling tower cooling water directly exchanges heat with the laser cooling water to cool it down. At this time, the compressor refrigeration circuit completely stops running, and the compressor 44 is completely dormant, achieving zero operation of the compressor 44. This can save up to 90% or more in energy. Moreover, it significantly reduces the circulation flow of refrigerant and the amount of system charge, reducing direct greenhouse gas emissions caused by refrigerant leakage. At the same time, the extremely low operating power consumption significantly reduces indirect carbon emissions from electricity consumption and reduces more than 80% of the unit failure sources such as compressor 44 wear, liquid slugging, surge, motor burnout, and lubricating oil failure, greatly extending the life of the chiller. At the same time, the high-frequency maintenance needs related to compressor 44 are significantly reduced. The maintenance cycle for lubricating oil replacement, filter replacement, and compressor 44 overhaul can be extended by 3-5 times, significantly reducing maintenance labor and material costs and reducing maintenance downtime.

[0021] This invention provides an energy-saving laser chiller, which combines a laser cooling water system 10, a cooling tower cooling water circulation system 30, and a compression refrigeration circuit system 40. The laser cooling water system 10 is configured to switch between a first and second flow state, and the cooling tower cooling water circulation system 30 is also configured to switch between the first and second flow states. The states of the laser cooling water system 10 and the cooling tower cooling water circulation system 30 can be switched based on the temperature difference between the cooling tower cooling water and the laser cooling water, enabling switching between compressor refrigeration mode and direct cooling tower cooling water mode. This achieves laser cooling water cooling while effectively reducing compressor 44 operating time, lowering energy consumption, and achieving energy savings. Furthermore, reducing compressor 44 operating time also reduces potential sources of unit failure such as compressor wear, liquid slugging, surge, motor burnout, and lubricating oil failure, effectively extending the chiller's lifespan.

[0022] The compression refrigeration circuit system 40 includes an evaporator 41, a compressor 44, a heat exchange condenser 45, and a throttling device 47 arranged sequentially along the refrigerant flow direction. Specifically, the refrigerant output terminal of the evaporator 41 is connected to the refrigerant input terminal of the compressor 44, the refrigerant output terminal of the compressor 44 is connected to the refrigerant input terminal of the heat exchange condenser 45, the refrigerant output terminal of the heat exchange condenser 45 is connected to the refrigerant input terminal of the throttling device 47, and the refrigerant output terminal of the throttling device 47 is connected to the refrigerant input terminal of the evaporator 41. When in use, when the temperature difference between the cooling tower cooling water and the laser cooling water is less than a preset threshold, the compression refrigeration circuit system 40 works. The refrigerant flows through the evaporator 41 and exchanges heat with the laser cooling water, and then enters the compressor 44. The compressor 44 compresses the refrigerant into a high-temperature and high-pressure gas. Then the refrigerant flows to the heat exchange condenser 45 to exchange heat and become a low-temperature and high-pressure state. After passing through the throttling device 47, it becomes a low-temperature and low-pressure state again, and then flows to the evaporator 41 to exchange heat with the laser cooling water, so that the refrigerant continuously circulates in the above manner.

[0023] Preferably, the refrigerant output end of the heat exchange condenser 45 is connected to the refrigerant input end of the throttling device 47 through a refrigerant flow solenoid valve.

[0024] The evaporator 41 is provided with a first cooling water heat exchange channel 42 and a first refrigerant heat exchange channel 43; the heat exchange condenser 45 is provided with a first cooling water heat exchange channel 46; the cooling tower cooling water circulation system 30 includes a plate heat exchanger 64; the plate heat exchanger 64 is provided with a second cooling water heat exchange channel 65 and a second cooling water heat exchange channel 66; when the cooling tower cooling water circulation system 30 switches to the first cooling water flow state, the cooling tower cooling water circulation system 30 is connected to the first cooling water heat exchange channel 46 of the heat exchange condenser 45; when the laser cooling water system 10 switches to the first laser cooling water flow state, the laser cooling water system 10 is connected to the first cooling water heat exchange channel 42 of the evaporator 41; when the laser cooling water system 10 switches to the second laser cooling water flow state, the laser cooling water system 10 is connected to the second cooling water heat exchange channel 65 of the plate heat exchanger 64.

[0025] When the temperature difference between the cooling tower cooling water and the laser cooling water is greater than or equal to a preset threshold, the cooling tower cooling water and the laser cooling water are cooled by heat exchange. The plate heat exchanger 64 achieves fully closed physical isolation heat exchange between the cooling tower cooling water and the laser cooling water, avoiding the problems of impurities entering the chiller and causing corrosion, scaling and blockage caused by open systems. This greatly extends the service life of the chiller, reduces the operation and maintenance costs of water treatment, and at the same time ensures the purity of the laser cooling water in the laser machine 71 body, preventing blockage of the internal flow channels of the laser.

[0026] The laser cooling water system 10 is equipped with a laser cooling water temperature measuring device 51 for detecting the temperature of the laser cooling water; the cooling tower cooling water circulation system 30 is equipped with a cooling tower cooling water temperature measuring device 52 for detecting the temperature of the cooling tower cooling water.

[0027] The laser cooling water system 10 includes a first cooling water return pipe 13, a second cooling water return pipe 14, a water storage device 15, a first cooling water inlet pipe 11, and a second cooling water inlet pipe 12; the first cooling water inlet pipe 11 and the second cooling water inlet pipe 12 are respectively connected to the outlet of the laser machine 71; the first cooling water inlet pipe 11 is connected to the first cooling water heat exchange channel 42, and the first cooling water heat exchange channel 42 is connected to the first cooling water return pipe 13; the second cooling water inlet pipe 12 is used for... The laser cooling water system 10 is connected to the second cooling water heat exchange channel 65; the second cooling water heat exchange channel 65 is connected to the second cooling water return pipe 14 through the water storage device 15; the first cooling water return pipe 13 and the second cooling water return pipe 14 are respectively connected to the return water port of the laser machine 71; the laser cooling water temperature measuring device 51 includes a first temperature control solenoid valve 17 and a second temperature control solenoid valve 18; the first temperature control solenoid valve 17 is installed on the first cooling water inlet pipe 11; the second temperature control solenoid valve 18 is installed on the second cooling water inlet pipe 12. When the first temperature control solenoid valve 17 is open and the second temperature control solenoid valve 18 is closed, the laser cooling water system 10 is in the first flow state of laser cooling water; when the second temperature control solenoid valve 18 is open and the first temperature control solenoid valve 17 is closed, the laser cooling water system 10 is in the second flow state of laser cooling water. By adopting the above structure, the flow state of the laser cooling water system 10 can be switched by operating the first temperature control solenoid valve 17 and the second temperature control solenoid valve 18, making it more convenient to use.

[0028] In use, when the first temperature control solenoid valve 17 is open and the second temperature control solenoid valve 18 is closed, the first cooling water inlet pipe 11 is in a flowing state and the second cooling water inlet pipe 12 is in a cut-off state; the laser cooling water system 10 is in the first flowing state of laser cooling water, the compression refrigeration circuit system 40 is working, the laser cooling water flowing out of the outlet of the laser machine 71 flows through the first cooling water inlet pipe 11 to the first cooling water heat exchange channel 42, the laser cooling water flowing through the first cooling water heat exchange channel 42 exchanges heat with the refrigerant in the first refrigerant heat exchange channel 43 to cool down, and then flows back to the laser machine 71 through the first cooling water return pipe 13 for cooling, thus performing cooling work by reciprocating the above-mentioned circulation.

[0029] When the second temperature control solenoid valve 18 is open and the first temperature control solenoid valve 17 is closed, the first cooling water inlet pipe 11 is in a cut-off state, the second cooling water inlet pipe 12 is in a flowing state, and the laser cooling water system 10 is in the second flowing state of laser cooling water. The laser cooling water flowing out of the outlet of the laser machine 71 flows through the second cooling water inlet pipe 12 to the second cooling water heat exchange channel 65. During the process of the laser cooling water flowing through the second cooling water heat exchange channel 65, it exchanges heat with the cooling tower cooling water of the second cooling water heat exchange channel 66 and then flows back to the laser machine 71 through the water storage device 15 and the second cooling water return pipe 14 for cooling. Thus, the cooling work is carried out by repeated circulation in the above manner.

[0030] The water storage device 15 includes a buffer water tank 61 and a first water pump 62; the inlet of the buffer water tank 61 is connected to the second cooling water heat exchange channel 65; the outlet of the buffer water tank 61 is connected to the inlet of the first water pump 62; and the outlet of the first water pump 62 is connected to the second cooling water return pipe 14. The buffer water tank 61 is equipped with a water tank temperature probe 21 and a water tank heating rod 22. The water tank temperature probe 21 is used to detect the temperature of the laser cooling water, and the water tank heating rod 22 is used to heat the laser cooling water. In operation, when the second temperature-controlled solenoid valve 18 is open and the first temperature-controlled solenoid valve 17 is closed, the laser cooling water flows through the second cooling water heat exchange channel 65, exchanges heat with the cooling tower cooling water in the second cooling water heat exchange channel 66, and then flows to the buffer water tank 61. The water temperature probe 21 in the buffer water tank 61 detects the temperature of the laser cooling water. If the temperature of the laser cooling water is too low, the water tank heating rod 22 is activated to heat the laser cooling water. Under the pumping action of the first water pump 62, the laser cooling water in the buffer water tank 61 flows back to the laser machine 71 through the second cooling water return pipe 14. By installing the water temperature probe 21 on the buffer water tank 61 to detect the temperature of the laser cooling water, and using the water tank heating rod 22, the temperature can be rapidly increased, improving the speed of equipment response, avoiding the impact of excessively low laser cooling water temperature on the normal operation of the laser machine 71, ensuring temperature control accuracy, and improving system stability.

[0031] The evaporator 41 is equipped with an evaporator water temperature probe 19 and an evaporator heating rod 20. A second water pump 63 connects the evaporator 41 to the second cooling water return pipe 14. In use, when the first temperature control solenoid valve 17 is open and the second temperature control solenoid valve 18 is closed, the laser cooling water system 10 is in the first flow state of laser cooling water. The compression refrigeration circuit system 40 is working. After the laser cooling water enters the evaporator 41 and exchanges heat with the refrigerant in the first refrigerant heat exchange channel 43 to cool down, the temperature of the laser cooling water is detected by the evaporator water temperature probe 19. If the temperature of the laser cooling water is too low, the evaporator heating rod 20 is controlled to work to heat the laser cooling water. Under the pumping action of the second water pump 63, the laser cooling water in the evaporator 41 flows back to the laser machine 71 through the first cooling water return pipe 13. The temperature of the laser cooling water can be detected by setting an evaporator water temperature probe 19 on the evaporator 41, and the evaporator heating rod 20 can be used to heat up quickly, improve the speed of equipment response, avoid the laser machine 71 from being affected by the laser cooling water temperature being too low, ensure temperature control accuracy, and improve system stability.

[0032] The cooling tower cooling water circulation system 30 includes a cooling tower 31, a first cooling water return pipe 34, a second cooling water return pipe 35, a first cooling water inlet pipe 32, and a second cooling water inlet pipe 33; the first cooling water inlet pipe 32 and the second cooling water inlet pipe 33 are used to connect to the outlet of the cooling tower 31 respectively; the first cooling water inlet pipe 32 is used to connect to the first cooling water return pipe 34 through the first cooling water heat exchange channel 46; the second cooling water inlet pipe 35... Pipeline 33 is used to connect with the second cooling water return pipe 35 through the second cooling water heat exchange channel 66; the first cooling water return pipe 34 and the second cooling water return pipe 35 are respectively connected to the return water inlet of the cooling tower 31; the cooling tower cooling water temperature measuring device 52 includes a third temperature control solenoid valve 36 and a fourth temperature control solenoid valve 37; the third temperature control solenoid valve 36 is installed on the first cooling water inlet pipe 32; the fourth temperature control solenoid valve 37 is installed on the second cooling water inlet pipe 33. When the third temperature control solenoid valve 36 is open and the fourth temperature control solenoid valve 37 is closed, the cooling tower cooling water circulation system 30 is in the first flow state of cooling tower cooling water; when the fourth temperature control solenoid valve 37 is open and the third temperature control solenoid valve 36 is closed, the cooling tower cooling water circulation system 30 is in the second flow state of cooling tower cooling water. By adopting the above structure, the state of the cooling tower cooling water circulation system 30 can be switched by operating the third temperature control solenoid valve 36 and the fourth temperature control solenoid valve 37, making it more convenient to use.

[0033] In operation, when the third temperature control solenoid valve 36 and the fourth temperature control solenoid valve 37 are open, the compression refrigeration circuit system 40 is working. The first cooling water inlet pipe 32 is in a flowing state, and the second cooling water inlet pipe 33 is in a cut-off state. The cooling tower cooling water circulation system 30 is in the first flowing state of cooling tower cooling water. The cooling tower cooling water of the cooling tower 31 flows to the heat exchange condenser 45 through the first cooling water inlet pipe 32. The cooling tower cooling water flowing through the heat exchange condenser 45 acts as a cooling medium to cool the high-temperature and high-pressure gaseous refrigerant flowing through the heat exchange condenser 45. Then, it flows back to the cooling tower 31 from the first cooling water return pipe 34, thus continuously circulating in the above manner.

[0034] When the fourth temperature control solenoid valve 37 is open and the third temperature control solenoid valve 36 is closed, the second cooling water inlet pipe 33 is in a flowing state, the first cooling water inlet pipe 32 is in a cut-off state, and the cooling tower cooling water circulation system 30 is in the second flowing state of cooling tower cooling water. The cooling tower cooling water provided by the cooling tower 31 flows to the plate heat exchanger 64 through the second cooling water inlet pipe 33. The cooling tower cooling water flowing through the plate heat exchanger 64 serves as a cold source to cool the laser cooling water flowing through the plate heat exchanger 64. Subsequently, the cooling tower cooling water flows back to the cooling tower 31 through the second cooling water return pipe 35.

[0035] The preset threshold is 3℃-7℃. By reasonably setting this preset threshold, the heat exchange efficiency can be improved in the mode where the cooling tower cooling water directly exchanges heat with the laser cooling water, avoiding insufficient heat exchange caused by too small a temperature difference.

[0036] As a further preferred embodiment of the present invention, the chiller also includes a control system. When the temperature difference between the cooling tower cooling water and the laser cooling water is detected to be less than a preset threshold, the control system controls the first temperature-controlled solenoid valve 17 and the third temperature-controlled solenoid valve 36 to open, and controls the second temperature-controlled solenoid valve 18 and the fourth temperature-controlled solenoid valve 37 to close. When the temperature difference between the cooling tower cooling water and the laser cooling water is greater than or equal to the preset threshold, the control system controls the second temperature-controlled solenoid valve 18 and the fourth temperature-controlled solenoid valve 37 to open, and controls the first temperature-controlled solenoid valve 17 and the third temperature-controlled solenoid valve 36 to close. By adopting the above settings, the state of the laser cooling water system 10 and the cooling tower cooling water circulation system 30 can be intelligently switched by the control system according to the detected temperature difference between the cooling tower cooling water and the laser cooling water, thereby realizing automated management of the water flow direction and automatically switching to compressor cooling mode or cooling tower cooling water direct cooling mode.

[0037] The control device can be any commercially available control device, as long as it can control the first temperature-controlled solenoid valve 17, the second temperature-controlled solenoid valve 18, the third temperature-controlled solenoid valve 36, and the fourth temperature-controlled solenoid valve 37. As a further preferred embodiment of the invention, the control system can also be configured to acquire the first water temperature detection value of the laser cooling water temperature measuring device 51 and the second water temperature detection value of the cooling tower cooling water temperature measuring device 52, and calculate the actual temperature difference between them. The controller has a preset threshold value and is used to compare and analyze the actual temperature difference with the preset threshold value. Based on the result of the comparison and analysis, the controller controls the working state of the first temperature-controlled solenoid valve 17, the second temperature-controlled solenoid valve 18, the third temperature-controlled solenoid valve 36, and the fourth temperature-controlled solenoid valve 37, thereby eliminating the need for manual intervention in analysis and operation, and further improving its intelligence.

[0038] The energy-saving laser chiller of this invention can be switched to compressor refrigeration mode or cooling tower cooling direct water cooling mode during actual operation: Compressor cooling mode During operation, the laser cooling water temperature is detected by the laser cooling water temperature measuring device 51, and the cooling tower cooling water temperature is detected by the cooling tower cooling water temperature measuring device 52. When the temperature difference between the cooling tower cooling water temperature and the laser cooling water temperature is less than a preset threshold (i.e., the cooling tower cooling water is insufficient to directly cool the laser cooling water), the control system controls the first temperature control solenoid valve 17 and the third temperature control solenoid valve 36 to open, and controls the second temperature control solenoid valve 18 to close. The laser cooling water system 10 is in the first flow state of laser cooling water, the compression refrigeration circuit system 40 is working, and the laser cooling water flowing out of the outlet of the laser machine 71 passes through the first temperature control solenoid valve 17 and the third temperature control solenoid valve 36 to close. A cooling water inlet pipe 11 flows to the first cooling water heat exchange channel 42 of the evaporator 41. The laser cooling water flowing through the first cooling water heat exchange channel 42 exchanges heat with the refrigerant in the evaporator 41 to cool down. The evaporator water temperature probe 19 of the evaporator 41 detects the temperature of the laser cooling water. If the temperature of the laser cooling water is too low, the evaporator heating rod 20 is controlled to work. The evaporator heating rod 20 heats the laser cooling water to bring the temperature of the laser cooling water within a predetermined temperature range. Then, the laser cooling water with the temperature within the predetermined temperature range is pumped by the second water pump 63 and flows back to the laser machine 71 through the first cooling water return pipe 13 for cooling. Thus, the cooling work is carried out by repeated circulation in the above manner.

[0039] The cooling tower cooling water circulation system 30 is in the first flow state of cooling tower cooling water. The cooling tower cooling water provided by the cooling tower 31 passes through the first cooling water inlet pipe 32 and enters the first cooling water heat exchange channel 46 of the heat exchange condenser 45 from the cooling water inlet below the heat exchange condenser 45. It flows out from the cooling water outlet above the heat exchange condenser 45. The cooling tower cooling water flowing through the heat exchange condenser 45 acts as a cooling medium to cool the high temperature and high pressure gaseous refrigerant flowing through the heat exchange condenser 45. Then it flows back to the cooling tower 31 from the first cooling water return pipe 34, thus continuously circulating and working in the above manner.

[0040] During the operation of the compression refrigeration circuit system 40, the refrigerant flows through the evaporator 41 and exchanges heat with the laser cooling water before entering the compressor 44. The compressor 44 compresses the refrigerant into a high-temperature and high-pressure gas. The refrigerant then flows to the heat exchange condenser 45 for heat exchange, and then passes through the throttling device 47 to become a low-temperature and low-pressure state again before flowing back to the evaporator 41 to exchange heat with the laser cooling water. This allows the refrigerant to continuously circulate and operate in the above manner.

[0041] Cooling tower cooling water direct cooling mode During operation, the laser cooling water temperature is detected by the laser cooling water temperature measuring device 51, and the cooling tower cooling water temperature is detected by the cooling tower cooling water temperature measuring device 52. When the temperature difference between the cooling tower cooling water temperature and the laser cooling water temperature is greater than or equal to a preset threshold, the control system controls the second temperature control solenoid valve 18 and the fourth temperature control solenoid valve 37 to open, and controls the first temperature control solenoid valve 17 and the third temperature control solenoid valve 36 to close. The laser cooling water system 10 is in the second flow state of laser cooling water. The laser cooling water flowing out of the outlet of the laser machine 71 flows through the second cooling water inlet pipe 12 to the second cooling water inlet pipe of the plate heat exchanger 64. In the second cooling water heat exchange channel 65, the laser cooling water exchanges heat with the cooling tower cooling water in the second cooling water heat exchange channel 66 to achieve cooling. After achieving the cooling purpose, it flows into the buffer water tank 61. When the water temperature probe 21 detects that the temperature of the laser cooling water is lower than the predetermined temperature range, it controls the water tank heating rod 22 to work, heating the laser cooling water to bring its temperature within the predetermined temperature range. Then, the laser cooling water, with its temperature within the predetermined temperature range, flows back to the laser machine 71 through the second cooling water return pipe 14 under the pumping action of the second water pump 63. The predetermined temperature range can be set according to the operating conditions of the laser machine 71.

[0042] The cooling tower cooling water circulation system 30 is in the second flow state of cooling tower cooling water. The cooling tower cooling water provided by the cooling tower 31 flows to the plate heat exchanger 64 through the second cooling water inlet pipe 33. It enters the second cooling water heat exchange channel 66 from the cooling water inlet below the plate heat exchanger 64 and flows out from the cooling water outlet above the plate heat exchanger 64. The cooling tower cooling water flowing through the plate heat exchanger 64 serves as a cold source to cool the laser cooling water flowing through the plate heat exchanger 64. Then, the cooling tower cooling water flows back to the cooling tower 31 through the second cooling water return pipe 35, and then continuously circulates in the above manner.

[0043] 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. An energy-saving laser chiller, characterized in that: This includes a laser cooling water system, a cooling tower cooling water circulation system, and a compression refrigeration circuit system; The laser cooling water system is used to supply laser cooling water circulation; the laser cooling water system is adapted to switch to a first laser cooling water circulation state or a second laser cooling water circulation state. The cooling tower cooling water circulation system is used to circulate the cooling tower cooling water; the cooling tower cooling water circulation system is adapted to switch to the first circulation state or the second circulation state of the cooling tower cooling water. The compression refrigeration circuit system is used to circulate refrigerant; the compression refrigeration circuit system includes a compressor. When the temperature difference between the cooling tower cooling water and the laser cooling water is less than a preset threshold, the laser cooling water system switches to the first flow state of laser cooling water, the cooling tower cooling water circulation system switches to the first flow state of cooling tower cooling water, and the laser cooling water system is connected to the compression refrigeration circuit system to use the refrigerant to exchange heat and cool the laser cooling water; the cooling tower cooling water circulation system is connected to the compression refrigeration circuit system to use the cooling tower cooling water to exchange heat and cool the refrigerant. When the temperature difference between the cooling tower cooling water and the laser cooling water is greater than or equal to a preset threshold, the laser cooling water system switches to the second flow state of laser cooling water, the cooling tower cooling water circulation system switches to the second flow state of cooling tower cooling water, and the laser cooling water system and the cooling tower cooling water circulation system are connected to each other so as to use the cooling tower cooling water to directly exchange heat and cool the laser cooling water; the compression refrigeration circuit system stops operating.

2. The energy-saving laser chiller as described in claim 1, characterized in that: The compression refrigeration loop system includes an evaporator and a heat exchange condenser. The evaporator has a first cooling water heat exchange channel and a first refrigerant heat exchange channel. The heat exchange condenser has a first cooling water heat exchange channel. The cooling tower cooling water circulation system includes a plate heat exchanger. The plate heat exchanger has a second cooling water heat exchange channel and a second cooling water heat exchange channel. When the cooling tower cooling water circulation system switches to the first cooling water flow state, the cooling tower cooling water circulation system is connected to the first cooling water heat exchange channel of the heat exchange condenser. When the laser cooling water system switches to the first laser cooling water flow state, the laser cooling water system is connected to the first cooling water heat exchange channel of the evaporator. When the laser cooling water system switches to the second laser cooling water flow state, the laser cooling water system is connected to the second cooling water heat exchange channel of the plate heat exchanger. The laser cooling water system is equipped with a laser cooling water temperature measuring device for detecting the laser cooling water temperature. The cooling tower cooling water circulation system is equipped with a cooling tower cooling water temperature measuring device for detecting the cooling tower cooling water temperature.

3. The energy-saving laser chiller as described in claim 2, characterized in that: The laser cooling water system includes a first cooling water return pipe, a second cooling water return pipe, a water storage device, a first cooling water inlet pipe, and a second cooling water inlet pipe. The first and second cooling water inlet pipes are respectively connected to the outlet of the laser machine. The first cooling water inlet pipe is connected to a first cooling water heat exchange channel. The first cooling water heat exchange channel is connected to the first cooling water return pipe. The second cooling water inlet pipe is connected to the second cooling water heat exchange channel. The second cooling water heat exchange channel is connected to the second cooling water return pipe through the water storage device. The first and second cooling water return pipes are respectively connected to the return port of the laser machine. The laser cooling water temperature measuring device includes a first temperature control solenoid valve and a second temperature control solenoid valve. The first temperature control solenoid valve is installed on the first cooling water inlet pipe. The second temperature control solenoid valve is installed on the second cooling water inlet pipe.

4. The energy-saving laser chiller as described in claim 3, characterized in that: The water storage device includes a buffer tank and a first water pump; the inlet of the buffer tank is connected to a second cooling water heat exchange channel; the outlet of the buffer tank is connected to the inlet of the first water pump; and the outlet of the first water pump is connected to a second cooling water return pipeline.

5. The energy-saving laser chiller as described in claim 4, characterized in that: The water storage device is equipped with a water tank temperature probe and a water tank heating rod. The water tank temperature probe is used to detect the temperature of the laser cooling water, and the water tank heating rod is used to heat the laser cooling water.

6. The energy-saving laser chiller as described in claim 3 or 4, characterized in that: When the first temperature-controlled solenoid valve is open and the second temperature-controlled solenoid valve is closed, the laser cooling water system is in the first flow state of laser cooling water; when the second temperature-controlled solenoid valve is open and the first temperature-controlled solenoid valve is closed, the laser cooling water system is in the second flow state of laser cooling water.

7. The energy-saving laser chiller as described in claim 1, characterized in that: The cooling tower cooling water circulation system includes a cooling tower, a first cooling water return pipe, a second cooling water return pipe, a first cooling water inlet pipe, and a second cooling water inlet pipe. The first and second cooling water inlet pipes are connected to the outlets of the cooling tower, respectively. The first cooling water inlet pipe is connected to the first cooling water return pipe via a first cooling water heat exchange channel. The second cooling water inlet pipe is connected to the second cooling water return pipe via a second cooling water heat exchange channel. The first and second cooling water return pipes are connected to the return outlet of the cooling tower. The cooling tower cooling water temperature measuring device includes a third temperature-controlled solenoid valve and a fourth temperature-controlled solenoid valve. The third temperature-controlled solenoid valve is installed on the first cooling water inlet pipe, and the fourth temperature-controlled solenoid valve is installed on the second cooling water inlet pipe.

8. The energy-saving laser chiller as described in claim 7, characterized in that: When the third and fourth temperature-controlled solenoid valves are both open, the cooling tower cooling water circulation system is in the first flow state of cooling tower cooling water; when the fourth temperature-controlled solenoid valve is open and the third temperature-controlled solenoid valve is closed, the cooling tower cooling water circulation system is in the second flow state of cooling tower cooling water.

9. The energy-saving laser chiller as described in claim 2, characterized in that: The compression refrigeration circuit also includes a compressor and a throttling device; the evaporator, compressor, heat exchange condenser and throttling device are arranged sequentially along the refrigerant flow direction.

10. The energy-saving laser chiller as described in claim 1, characterized in that: The preset threshold is 3℃-7℃.

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