Cooling circulation system

Abstract

The invention discloses a liquid nitrogen cooling circulation system which comprises a circulation pipeline, a container, a high-pressure container, a pump body and a pressure adjusting assembly, a first cooling medium is arranged in the container, the circulation pipeline comprises a first heat exchange pipe section and a second heat exchange pipe section, the first heat exchange pipe section is installed in the first cooling medium in the container, and the second heat exchange pipe section is installed in the high-pressure container. The second heat exchange pipe section is installed in a load, a second cooling medium is arranged in the high-pressure container, the high-pressure container is connected into the circulation pipeline so that the pressure intensity in the high-pressure container can be consistent with the pressure intensity in the circulation pipeline, the pressure adjusting assembly is connected with the high-pressure container, and the pressure adjusting assembly can maintain or increase the pressure of the circulation pipeline by increasing the pressure intensity in the high-pressure container. The pump body is assembled on the circulation pipeline to drive the second cooling medium in the circulation pipeline to circulate between the first heat exchange pipe section and the second heat exchange pipe section, and by arranging the high-pressure container with the pressure adjusting assembly, the working reliability and the pressure intensity stability of the cooling circulation system are guaranteed.

Description

Technical Field

[0001] The invention relates to the field of cooling technology, and in particular to a cooling circulation system. Background Art

[0002] After the monochromator system absorbs heat, it will produce thermal deformation, which will destroy the transmission of the light source and the energy resolution of the monochromatic light. In order to make the monochromator system work reliably, a cooling system is required to maintain the temperature of the monochromator system at around 80-110K, and the parameters such as the cooling system pressure should be as stable as possible to make the vibration of the fluid in the cooling pipe small enough to avoid it having a measurable impact on the performance of the monochromator. Summary of the invention

[0003] In order to solve the technical problems existing in the background technology, the present invention proposes a liquid nitrogen cooling circulation system.

[0004] A cooling circulation system is used to cool a load, comprising: a circulation pipeline, a container, a high-pressure container, a pump body, and a pressure regulating assembly. The container has a first cooling medium. The circulation pipeline comprises a first heat exchange pipe section and a second heat exchange pipe section. The first heat exchange pipe section is installed in the first cooling medium in the container, and the second heat exchange pipe section is installed in the load. The high-pressure container has a second cooling medium. The high-pressure container is connected to the circulation pipeline so that the pressure in the high-pressure container is consistent with the pressure in the circulation pipeline. The pressure regulating assembly is connected to the high-pressure container. The pressure regulating assembly can maintain or increase the pressure of the circulation pipeline by increasing the pressure in the high-pressure container. The pump body is assembled on the circulation pipeline to drive the second cooling medium in the circulation pipeline to circulate between the first heat exchange pipe section and the second heat exchange pipe section.

[0005] Preferably, the first cooling medium and the second cooling medium are both liquid nitrogen, and the pressure regulating component increases the pressure in the high-pressure container specifically by: the pressure regulating component transfers heat to the liquid nitrogen in the high-pressure container to gasify part of the liquid nitrogen into nitrogen to increase the pressure in the high-pressure container.

[0006] Preferably, a first exhaust pipe is provided on the container, and a first liquid inlet pipe for replenishing liquid nitrogen into the container is also provided on the container, and a first control valve is provided on the first liquid inlet pipe.

[0007] Preferably, the cooling circulation system also includes: a controller and a first pressure sensor for monitoring the pressure in the high-pressure container, a second exhaust pipe and a first temperature sensor for collecting the temperature of liquid nitrogen in the second heat exchange pipe section are provided on the side of the second heat exchange pipe section on the circulation pipeline, a second control valve is provided on the second exhaust pipe, a second liquid inlet pipe for replenishing liquid nitrogen in the high-pressure container is provided on the high-pressure container, a third control valve is provided on the second liquid inlet pipe, the first liquid inlet pipe and the second liquid inlet pipe are merged into the main liquid inlet pipe, when the first temperature sensor detects that the temperature exceeds a preset value, the controller opens the second control valve, the high-pressure container is also provided with a third exhaust pipe for discharging nitrogen in the high-pressure container, the third exhaust pipe is provided with a fourth control valve, the outlet end of the third exhaust pipe is located in the container, and when the pressure in the high-pressure container exceeds a preset value, the controller controls the fourth control valve to open.

[0008] Preferably, a first liquid level sensor is provided in the container, and a second liquid level sensor is provided in the high-pressure container. When the liquid nitrogen level in the container monitored by the first liquid level sensor is lower than a preset level, the controller controls the injection of liquid nitrogen into the container through the first liquid inlet pipe. When the liquid nitrogen level in the high-pressure container monitored by the second liquid level sensor is lower than a preset level, the controller controls the injection of liquid nitrogen into the high-pressure container through the second liquid inlet pipe.

[0009] Preferably, a third tube body is connected to the circulation pipeline, both ends of the third tube body are connected to the circulation pipeline, one end of the third tube body is connected between the outlet of the first heat exchange pipe section and the inlet of the second heat exchange pipe section, and the other end is connected between the inlet of the first heat exchange pipe section and the outlet of the second heat exchange pipe section. A fifth control valve, a sixth control valve and a seventh control valve are provided on the circulation pipeline. The fifth control valve is located between the inlet end of the second heat exchange pipe section and one end of the third tube body, the sixth control valve is located between the outlet end of the second heat exchange pipe section and the other end of the third tube body, and the seventh control valve is installed on the third tube body. The interface between the second exhaust pipe and the circulation pipeline is located between the sixth control valve and the outlet end of the second heat exchange pipe section, and the outlet end of the second exhaust pipe is located in the container. When the monitoring temperature of the first temperature sensor is greater than the preset temperature, the controller can control the fifth control valve and the sixth control valve to close and the seventh control valve to open, and then the controller controls the second control valve to open so as to discharge the nitrogen flowing through the second heat exchange pipe section between the fifth control valve and the sixth control valve in the circulation pipeline into the container.

[0010] Preferably, the controller can control the fifth control valve and the sixth control valve to open, the controller can control the second control valve to close, the seventh control valve is a regulating valve, and the controller can adjust the flow rate of liquid nitrogen flowing from the first heat exchange pipe section to the second heat exchange pipe section through the circulation pipeline by controlling the opening amplitude of the seventh control valve.

[0011] Preferably, a vacuum generator for evacuating the circulation pipeline is connected to the circulation pipeline, and a nitrogen source component for purging the circulation pipeline is connected to the circulation pipeline.

[0012] Preferably, a first protection device for protecting the circulation pipeline from overpressure is connected to the circulation pipeline.

[0013] Preferably, a second protection device for protecting the high-pressure container from overpressure is connected to the high-pressure container.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] A high-pressure container with a pressure regulating component is set up to increase the boiling point of liquid nitrogen by maintaining and enhancing the pressure of liquid nitrogen in the circulation pipeline, thereby ensuring the working reliability and pressure stability of the cooling circulation system.

[0016] By providing the first exhaust pipe, the second exhaust pipe, the third exhaust pipe, the first liquid inlet pipe, and the second liquid inlet pipe, it can be ensured that the cooling circulation system can discharge the nitrogen evaporated by heat in time and replenish new cooling liquid nitrogen, thereby further ensuring the working reliability of the cooling circulation system.

[0017] By setting a third pipeline on the circulation pipeline, the heat of the load can be discharged more specifically, and the impact of nitrogen discharge on the circulation pipeline can be minimized. In addition, the regulating valve on the third pipeline can also control the flow of the second heat exchange pipe section flowing through the load to achieve more precise control of the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a liquid nitrogen cooling circulation system proposed by the present invention.

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of a liquid nitrogen cooling circulation system proposed by the present invention.

[0020] Figure 3 In order to facilitate observation of the internal structure of the cooling circulation system, the structural schematic diagram after some containers are hidden. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Reference Figures 1 to 3A cooling circulation system is used to cool a load, comprising: a circulation pipeline 1, a container 2, a high-pressure container 3, a pump body 4, and a pressure regulating component 5. The container 2 has a first cooling medium. The circulation pipeline 1 comprises a first heat exchange pipe segment 1a and a second heat exchange pipe segment 1b. The first heat exchange pipe segment 1a is installed in the first cooling medium in the container 2. In practical applications, a heat exchange coil can be used. The second heat exchange pipe segment 1b is installed in the load 6. The high-pressure container 3 has a second cooling medium. The high-pressure container 3 is connected to the circulation pipeline 1 so that the pressure in the high-pressure container 3 is consistent with the pressure in the circulation pipeline 1. The pressure regulating component 5 is connected to the high-pressure container 3. The pressure regulating component 5 can maintain or increase the pressure of the circulation pipeline 1 by increasing the pressure in the high-pressure container 3. The pump body 4 is assembled on the circulation pipeline 1 to drive the second cooling medium in the circulation pipeline 1 to circulate between the first heat exchange pipe segment 1a and the second heat exchange pipe segment 1b.

[0023] The working principle of the cooling circulation system is as follows: the second cooling medium in the second heat exchange pipe segment 1b can bring the heat in the load 6 to the first heat exchange pipe segment 1a, and the first cooling medium can absorb the heat in the second cooling medium in the first heat exchange pipe segment 1a, so that it continues to flow to the second heat exchange pipe segment 1b after cooling down to cool the load 6. In order to ensure that the second cooling medium in the circulation pipeline 1 is kept in liquid as much as possible, reduce the nitrogen content, and ensure the pressure stability of the cooling circulation system, a high-pressure container 3 with a pressure regulating component 5 is provided. By maintaining and enhancing the pressure of the second cooling medium in the circulation pipeline 1, its boiling point is increased to ensure the working reliability and pressure stability of the cooling circulation system.

[0024] In order to achieve a good cooling effect, the first cooling medium and the second cooling medium are both liquid nitrogen with an ultra-low boiling point. The pressure regulating component 5 increases the pressure in the high-pressure container 3 specifically as follows: the pressure regulating component 5 transfers heat to the liquid nitrogen in the high-pressure container 3 to gasify part of the liquid nitrogen into nitrogen to increase the pressure in the high-pressure container 3. In practical applications, this can be achieved by inserting a heater 37 in the high-pressure container 3.

[0025] In order to ensure the pressure stability in the container 2 and the good cooling effect of the circulation pipeline 1, the container 2 is provided with a first exhaust pipe 7, and the container 2 is also provided with a first liquid inlet pipe 8 for replenishing liquid nitrogen into the container 2. The first liquid inlet pipe 8 is provided with a first control valve 9. When the liquid nitrogen in the container 2 is heated and evaporated into nitrogen gas, it is discharged from the first exhaust pipe 7, and liquid nitrogen is replenished into the container 2 through the liquid inlet pipe 8.

[0026] The cooling circulation system also includes: a controller 36 and a first pressure sensor 10 for monitoring the pressure in the high-pressure container 3. A second exhaust pipe 12 and a first temperature sensor 12 for collecting the temperature of liquid nitrogen in the second heat exchange pipe section 1b are provided on the side of the second heat exchange pipe section 1b on the circulation pipeline 1. A second control valve 13 is provided on the second exhaust pipe 12. A second liquid inlet pipe 14 for replenishing liquid nitrogen in the high-pressure container 3 is provided on the high-pressure container 3. A third control valve 15 is provided on the second liquid inlet pipe 14. The first liquid inlet pipe 8 and the second liquid inlet pipe 14 are merged into the main liquid inlet pipe 16. When the first temperature sensor 12 detects that the temperature exceeds a preset value, the controller 36 opens the second control valve 13 to achieve rapid cooling of the circulation pipeline 1. The high-pressure container 3 is also provided with a third exhaust pipe 17 for discharging nitrogen in the high-pressure container 3. A fourth control valve 18 is provided on the third exhaust pipe 17. The outlet end of the third exhaust pipe 17 is located in the container 2. When the pressure in the high-pressure container 3 exceeds a preset value, the controller 36 controls the fourth control valve 18 to open to ensure the working safety of the high-pressure container 3 and the circulation pipeline 1.

[0027] In order to ensure that there is always enough liquid nitrogen in the container 2 and the high-pressure container 3, a first liquid level sensor 19 is provided in the container 2, and a second liquid level sensor 20 is provided in the high-pressure container 3. When the liquid nitrogen level in the container 2 monitored by the first liquid level sensor 19 is lower than a preset level, the controller 36 controls the injection of liquid nitrogen into the container 2 through the first liquid inlet pipe 8. When the liquid nitrogen level in the high-pressure container 3 monitored by the second liquid level sensor 20 is lower than a preset level, the controller 36 controls the injection of liquid nitrogen into the high-pressure container 3 through the second liquid inlet pipe 14.

[0028] In order to control the first heat exchange pipe section 1a and the second heat exchange pipe section 1b in sections, a third pipe body 21 is connected to the circulation pipeline 1, and both ends of the third pipe body 21 are connected to the circulation pipeline 1. One end of the third pipe body 21 is connected between the outlet of the first heat exchange pipe section 1a and the inlet of the second heat exchange pipe section 1b, and the other end is connected between the inlet of the first heat exchange pipe section 1a and the outlet of the second heat exchange pipe section 1b. A fifth control valve 22, a sixth control valve 23, and a seventh control valve 24 are provided on the circulation pipeline 1. The fifth control valve 22 is located between the inlet end of the second heat exchange pipe section 1b and one end of the third pipe body 21, the sixth control valve 23 is located between the outlet end of the second heat exchange pipe section 1b and the other end of the third pipe body 21, and the seventh control valve 24 is installed on the third pipe body 21. The second exhaust pipe 12 The interface with the circulation pipeline 1 is located between the sixth control valve 23 and the outlet end of the second heat exchange pipe segment 1b, and the outlet end of the second exhaust pipe 12 is located in the container 2. When the monitoring temperature of the first temperature sensor 12 is greater than the preset temperature, the controller 36 can control the fifth control valve 22 and the sixth control valve 23 to close, and the seventh control valve 24 to open. Then the controller 36 controls the second control valve 13 to open so as to discharge the nitrogen flowing through the second heat exchange pipe segment 1b between the fifth control valve 22 and the sixth control valve 23 in the circulation pipeline 1 into the container 2. At the same time, the first heat exchange pipe segment 1a can still perform heat exchange circulation through the third pipe body 21. This control method can, on the one hand, discharge the heat of the load 6 more specifically, and on the other hand, minimize the impact of nitrogen discharge on the circulation pipeline 1.

[0029] The controller 36 can control the fifth control valve 22 and the sixth control valve 23 to open, and the controller 36 can control the second control valve 13 to close. The seventh control valve 24 is a regulating valve. The controller 36 can adjust the flow rate of liquid nitrogen flowing from the first heat exchange pipe section 1a to the second heat exchange pipe section 1b through the circulation pipeline 1 by controlling the opening amplitude of the seventh control valve 24, thereby achieving more precise cooling effect control.

[0030] In order to prevent the freezing of water vapor in the circulation pipeline 1 from affecting the circulation pipeline 1 and the control valve, a vacuum generator for evacuating the circulation pipeline 1 is connected to the circulation pipeline 1, and a nitrogen source component for purging the circulation pipeline 1 is connected to the circulation pipeline 1 to remove ice impurities in the circulation pipeline 1 and ensure the working reliability of the cooling circulation system.

[0031] For safety reasons, a first protection device for overpressure protection of the circulation pipeline 1 is connected to the circulation pipeline 1 . In practical applications, the first protection device may be a first safety valve 27 and a first bursting disc 28 .

[0032] For further safety considerations, the high-pressure container 3 is also connected to a second protection device for overpressure protection of the high-pressure container 3 . The second protection device may be a second safety valve 29 and a second bursting disc 30 .

[0033] In practical applications, in order to further ensure the working reliability of the cooling circulation system, a third safety valve 33 can be arranged on the wall of the container 1, a first filter 31 can be arranged on the main liquid inlet pipe 16, a second filter 32 can be arranged at the inlet end of the pump body 4, and a flow sensor 36 and a second pressure sensor 34 can be arranged on the circulation pipeline 1 to monitor the flow and pressure in the circulation pipeline 1 at any time. In order to enhance the cleaning effect of the cooling circulation system, a plurality of evacuation and purge interfaces 26, 35 connected to the vacuum generator and the nitrogen source assembly for evacuation can be arranged.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cooling circulation system for cooling a load, characterized in that: include: A circulation pipeline (1), a container (2), a high-pressure container (3), a pump body (4), and a pressure regulating assembly (5); the container (2) contains a first cooling medium; the circulation pipeline (1) comprises a first heat exchange pipe section (1a) and a second heat exchange pipe section (1b); the first heat exchange pipe section (1a) is installed in the first cooling medium in the container (2); the second heat exchange pipe section (1b) is installed in a load (6); the high-pressure container (3) contains a second cooling medium; the high-pressure container (3) is connected to the circulation pipeline (1) so that the pressure in the high-pressure container (3) is consistent with the pressure in the circulation pipeline (1); the pressure regulating assembly (5) is connected to the high-pressure container (3); the pressure regulating assembly (5) can maintain or increase the pressure of the circulation pipeline (1) by increasing the pressure in the high-pressure container (3); the pump body (4) is mounted on the circulation pipeline (1) to drive the second cooling medium in the circulation pipeline (1) to circulate between the first heat exchange pipe section (1a) and the second heat exchange pipe section (1b).

2. The cooling circulation system according to claim 1, characterized in that: The first cooling medium and the second cooling medium are both liquid nitrogen. The pressure regulating component (5) increases the pressure inside the high-pressure container (3) by transferring heat to the liquid nitrogen in the high-pressure container (3) so that part of the liquid nitrogen is gasified into nitrogen gas, thereby increasing the pressure inside the high-pressure container (3).

3. The cooling circulation system according to claim 2, characterized in that: The container (2) is provided with a first exhaust pipe (7), and the container (2) is also provided with a first liquid inlet pipe (8) for replenishing liquid nitrogen into the container (2), and the first liquid inlet pipe (8) is provided with a first control valve (9).

4. The cooling circulation system according to claim 3, characterized in that: Also includes: A controller (36) and a first pressure sensor (10) for monitoring the pressure in the high-pressure container (3); a second exhaust pipe (12) and a first temperature sensor (12) for collecting the temperature of liquid nitrogen in the second heat exchange pipe section (1b) are provided on the side of the second heat exchange pipe section (1b) on the circulation pipeline (1); a second control valve (13) is provided on the second exhaust pipe (12); a second liquid inlet pipe (14) for replenishing liquid nitrogen into the high-pressure container (3) is provided on the high-pressure container (3); a third control valve (15) is provided on the second liquid inlet pipe (14); and the first liquid inlet pipe (14) is provided with a second control valve (13). The pipe (8) and the second liquid inlet pipe (14) are merged into the main liquid inlet pipe (16); when the first temperature sensor (12) detects that the temperature exceeds a preset value, the controller (36) opens the second control valve (13); the high-pressure container (3) is also provided with a third exhaust pipe (17) for exhausting nitrogen in the high-pressure container (3); the third exhaust pipe (17) is provided with a fourth control valve (18); the outlet end of the third exhaust pipe (17) is located in the container (2); when the pressure in the high-pressure container (3) exceeds a preset value, the controller (36) controls the fourth control valve (18) to open.

5. The cooling circulation system according to claim 4, characterized in that: A first liquid level sensor (19) is provided in the container (2), and a second liquid level sensor (20) is provided in the high-pressure container (3). When the liquid nitrogen level in the container (2) monitored by the first liquid level sensor (19) is lower than a preset level, the controller (36) controls the injection of liquid nitrogen into the container (2) through the first liquid inlet pipe (8). When the liquid nitrogen level in the high-pressure container (3) monitored by the second liquid level sensor (20) is lower than a preset level, the controller (36) controls the injection of liquid nitrogen into the high-pressure container (3) through the second liquid inlet pipe (14).

6. The cooling circulation system according to claim 4, characterized in that: A third tube body (21) is connected to the circulation pipeline (1), and both ends of the third tube body (21) are connected to the circulation pipeline (1). One end of the third tube body (21) is connected between the outlet of the first heat exchange tube section (1a) and the inlet of the second heat exchange tube section (1b), and the other end is connected between the inlet of the first heat exchange tube section (1a) and the outlet of the second heat exchange tube section (1b). A fifth control valve (22), a sixth control valve (23), and a seventh control valve (24) are provided on the circulation pipeline (1). The fifth control valve (22) is located between the inlet end of the second heat exchange tube section (1b) and one end of the third tube body (21), and the sixth control valve (23) is located between the outlet end of the second heat exchange tube section (1b) and the other end of the third tube body (21). The seventh control valve (24) is mounted on the third pipe body (21); the interface between the second exhaust pipe (12) and the circulation pipeline (1) is located between the sixth control valve (23) and the outlet end of the second heat exchange pipe section (1b); the outlet end of the second exhaust pipe (12) is located in the container (2); when the monitoring temperature of the first temperature sensor (12) is greater than a preset value, the controller (36) can control the fifth control valve (22) and the sixth control valve (23) to close and the seventh control valve (24) to open; then the controller (36) controls the second control valve (13) to open so as to discharge the nitrogen flowing through the second heat exchange pipe section (1b) between the fifth control valve (22) and the sixth control valve (23) in the circulation pipeline (1) into the container (2).

7. The cooling circulation system according to claim 6, characterized in that: The controller (36) can control the fifth control valve (22) and the sixth control valve (23) to open, the controller (36) can control the second control valve (13) to close, the seventh control valve (24) is a regulating valve, and the controller (36) can adjust the flow rate of liquid nitrogen flowing from the first heat exchange pipe section (1a) through the circulation pipeline (1) into the second heat exchange pipe section (1b) by controlling the opening amplitude of the seventh control valve (24).

8. The cooling circulation system according to claim 7, characterized in that: The circulation pipeline (1) is connected to a vacuum generator for evacuating the circulation pipeline (1), and the circulation pipeline (1) is connected to a nitrogen source component for purging the circulation pipeline (1).

9. The cooling circulation system according to claim 7, characterized in that: A first protection device for protecting the circulation pipeline (1) from overpressure is connected to the circulation pipeline.

10. The cooling circulation system according to claim 7, characterized in that: A second protection device for protecting the high-pressure container (3) from overpressure is connected to the high-pressure container (3).

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