CN210662293U - Liquid nitrogen filling system - Google Patents
Liquid nitrogen filling system Download PDFInfo
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- CN210662293U CN210662293U CN201921586554.9U CN201921586554U CN210662293U CN 210662293 U CN210662293 U CN 210662293U CN 201921586554 U CN201921586554 U CN 201921586554U CN 210662293 U CN210662293 U CN 210662293U
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 154
- 239000007788 liquid Substances 0.000 title claims abstract description 122
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 76
- 238000001816 cooling Methods 0.000 claims abstract description 45
- 238000009755 vacuum infusion Methods 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims description 25
- 230000010412 perfusion Effects 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 14
- 238000001802 infusion Methods 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 2
- 238000005429 filling process Methods 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006837 decompression Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000037452 priming Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a liquid nitrogen filling system, include: the vacuum cooling tank, the vacuum dewar and the control system; it is used for detecting control system pressure in the vacuum dewar and pressure and liquid level in the vacuum dewar, and work as when liquid level in the vacuum dewar is less than first predetermined liquid level, adjust pressure in the vacuum dewar and pressure in the vacuum dewar makes pressure in the vacuum dewar is higher than pressure in the vacuum dewar pours into the vacuum dewar into in the liquid nitrogen again. The utility model discloses solve the liquid nitrogen effectively and pour into the time because the jar body pressure that needs to pour into is higher than pouring the dewar, and the phenomenon that slowly pours into or flows backward appears pouring into. And the automatic filling of the liquid nitrogen is realized by arranging a control system. The safety of the system is improved by arranging the overpressure relief electromagnetic valve and the safety valve. Through setting up the vacuum infusion pipe, avoided among the filling process vacuum dewar and the dismantlement difficulty that the subassembly kneck frosted and cause.
Description
Technical Field
The utility model relates to a liquid nitrogen filling equipment especially relates to a liquid nitrogen filling system.
Background
The commonly used liquid nitrogen filling mode is mostly an independent valve control mode, overpressure pressure relief control cannot be well performed in the filling process of the liquid nitrogen medium, and the phenomenon of slow filling or backward filling often occurs because the pressure of a tank body needing to be filled is higher than that of a filling Dewar in the filling process; on the other hand, in an operating room, if a traditional open perfusion mode is used, the noise is high, the influence on the ambient temperature is large, and white smoke is often sprayed out to influence the operating environment.
SUMMERY OF THE UTILITY MODEL
To the not enough among the above-mentioned prior art, the utility model aims to provide a liquid nitrogen system of filling, it can solve effectively because the jar body pressure that needs fill is higher than filling the dewar, and the phenomenon that slowly or flow backward appears filling.
The utility model provides a liquid nitrogen filling system, which comprises a vacuum cooling tank, a vacuum dewar and a control system; it is used for detecting control system pressure in the vacuum dewar and pressure and liquid level in the vacuum dewar, control system constructs to be worked as when liquid level in the vacuum dewar is less than first when predetermineeing the liquid level, control system adjusts pressure in the vacuum dewar and pressure in the vacuum dewar makes pressure in the vacuum dewar is higher than during the pressure in the vacuum dewar, will liquid nitrogen in the vacuum dewar pours into in the vacuum dewar.
Preferably, the control system comprises:
the detection assembly is used for detecting the pressure in the vacuum cooling tank, the pressure in the vacuum Dewar and the liquid level in the vacuum cooling tank and sending the detected pressure data and liquid level data to the controller;
a pressure regulation assembly for regulating pressure within the vacuum cold tank and the vacuum dewar;
the filling assembly comprises a pipeline and a filling electromagnetic valve, wherein the pipeline is communicated between the inlet of the vacuum cold tank and the outlet of the vacuum Dewar, and the filling electromagnetic valve is used for controlling the on-off of the pipeline;
the Dewar perfusion control valve is arranged on the vacuum Dewar and is used for controlling the opening and closing of an outlet of the vacuum Dewar; and
a controller for receiving and processing pressure data and liquid level data from the detection assembly, the controller being configured to control the pressure adjustment assembly to adjust the pressure of the vacuum cold tank and the vacuum dewar such that the pressure of the vacuum dewar is higher than the pressure of the vacuum cold tank when the liquid level of the vacuum cold tank is below a first preset liquid level; and under the condition that the pressure of the vacuum Dewar is higher than that of the vacuum cooling tank, the controller controls the filling electromagnetic valve and the Dewar filling control valve to be opened, so that the liquid nitrogen in the vacuum Dewar can be filled into the vacuum cooling tank.
Preferably, the detection assembly comprises:
the number of the pressure sensors is at least two, the two pressure sensors are respectively arranged in the vacuum cold tank and the vacuum Dewar, and the two pressure sensors are respectively used for detecting the pressure in the vacuum cold tank and the vacuum Dewar; and
and the first liquid level meter is arranged in the vacuum cooling tank and used for detecting the liquid level of liquid nitrogen in the vacuum cooling tank.
Preferably, the pressure regulating assembly includes: the vacuum cooling tank comprises a cooling tank discharge pressure regulating valve and a cooling tank pressure increasing valve, wherein the cooling tank discharge pressure regulating valve and the cooling tank pressure increasing valve are both arranged on the vacuum cooling tank and are used for regulating the air pressure in the vacuum cooling tank; and
the Dewar type pressure regulating device comprises a Dewar type pressure increasing valve and a Dewar type pressure releasing valve, wherein the Dewar type pressure increasing valve and the Dewar type pressure releasing valve are both arranged on the vacuum Dewar and used for regulating the pressure in the vacuum Dewar.
Preferably, the perfusion system further comprises a liquid nitrogen quick plug disposed on a pipeline between the perfusion solenoid valve and the outlet of the vacuum dewar.
Preferably, the perfusion system further comprises an overpressure relief solenoid valve disposed on a line between the perfusion solenoid valve and the outlet of the vacuum dewar.
Preferably, the infusion assembly further comprises a vacuum infusion tube connected to the outlet of the vacuum dewar.
Preferably, the detection assembly further comprises a second liquid level meter disposed within the vacuum dewar, the second liquid level meter for detecting a level of liquid nitrogen within the vacuum dewar.
Preferably, the installation direction of the filling electromagnetic valve is opposite to the flow direction of the liquid nitrogen filling.
Preferably, the installation direction of the overpressure relief solenoid valve is the same as the direction of nitrogen gas relief.
Compared with the prior art, the utility model provides a liquid nitrogen system of infusing is through gathering the pressure in vacuum dewar and the vacuum cooling jar, thereby forms pressure differential through the pressure in adjusting vacuum dewar and the vacuum cooling jar when needs are filled, because the jar body pressure that needs fill is higher than filling the dewar when solving the liquid nitrogen effectively and filling slowly or the phenomenon of flowing backward appears. And the automatic filling of the liquid nitrogen is realized by arranging a control system. Through setting up pressure adjustment assembly for can automatically regulated vacuum cold cylinder and vacuum dewar in pressure to the operating pressure scope after filling. The safety of the system is improved by arranging the overpressure relief electromagnetic valve and the safety valve. Through setting up the vacuum infusion pipe, avoided among the filling process vacuum dewar and the dismantlement difficulty that the subassembly kneck frosted and cause.
The above-mentioned technical characteristics can be combined in various suitable ways or replaced by equivalent technical characteristics as long as the purpose of the invention can be achieved.
Drawings
The invention will be described in more detail hereinafter on the basis of non-limiting examples only and with reference to the accompanying drawings. Wherein:
fig. 1 is a schematic structural diagram of a liquid nitrogen filling system provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a perfusion assembly provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of the control logic of the control system at the beginning of filling according to an embodiment of the present invention;
fig. 4 is a schematic control logic diagram of a control system after completion of filling according to an embodiment of the present invention.
Description of reference numerals:
1. carrying out vacuum cooling; 2. a vacuum dewar; 3. a first liquid level meter; 4. a first pressure sensor; 5. a second pressure sensor; 6. a third pressure sensor; 7. a pressure regulating valve for discharging the cold tank; 8. a cold tank pressurization valve; 9. a dewar pressure increasing valve; 10. a Dewar decompression valve; 11. filling an electromagnetic valve; 12. a dewar pour control valve; 14. an overpressure relief solenoid valve; 15. a vacuum infusion tube; 16. a second level gauge; 17. a first safety valve; 18. a second relief valve; 19. a third relief valve; 20. a first pressure gauge; 21. a second pressure gauge; 22. and (5) filling a release pipe.
Detailed Description
For making the purpose, technical solution and advantages of the present invention clearer, it will be right below that the technical solution of the present invention is clearly and completely described, based on the specific embodiments of the present invention, all other embodiments obtained by the ordinary skilled person in the art without creative work belong to the scope protected by the present invention.
As shown in fig. 1-2, the liquid nitrogen filling system provided in this embodiment includes a vacuum cooling tank, a vacuum dewar and a control system.
The vacuum cold tank 1 is used for storing and conveying liquid nitrogen to the outside of a liquid nitrogen perfusion system;
the vacuum Dewar 2 is used for storing liquid nitrogen and pouring the liquid nitrogen into the vacuum cold tank 1 when necessary;
the control system is used for detecting the pressure and the liquid level in the vacuum cold tank 1 and the pressure in the vacuum Dewar 2, when the liquid level of the vacuum cold tank 1 is lower than a preset value, the pressures of the vacuum cold tank 1 and the vacuum Dewar 2 are adjusted, so that the pressure of the vacuum Dewar 2 is higher than the pressure of the vacuum cold tank 1, and then liquid nitrogen in the vacuum Dewar 2 is filled into the vacuum cold tank 1.
The control system includes a sensing assembly, a pressure regulating assembly, a priming assembly, a dewar priming control valve 12 and a controller (not shown).
The detection assembly is used for detecting the pressure in the vacuum cooling tank 1, the pressure in the vacuum Dewar 2 and the liquid level in the vacuum cooling tank 1, and sending the detected pressure and liquid level data to the controller. The detection assembly comprises a liquid level meter and a pressure sensor, wherein the first liquid level meter 3 is partially arranged in the vacuum cooling tank 1 and is used for detecting the liquid level of liquid nitrogen in the vacuum cooling tank 1; the number of the pressure sensors is at least two, and the pressure sensors comprise a first pressure sensor 4 which is arranged in the vacuum cold tank 1 and is used for detecting the pressure in the vacuum cold tank 1 and a second pressure sensor 5 which is arranged in the vacuum Dewar 2 and is used for detecting the pressure in the vacuum Dewar 2; the liquid level meter and the pressure sensor respectively send the liquid level data and the pressure data which are respectively detected to the controller in real time.
The pressure regulating assembly is used for regulating the pressure in the vacuum cold tank 1 and the vacuum Dewar 2, and comprises a cold tank discharge pressure regulating valve 7 and a cold tank pressure increasing valve 8 which are arranged on the vacuum cold tank 1, and a Dewar pressure increasing valve 9 and a Dewar pressure releasing valve 10 which are arranged on the vacuum Dewar 2. The cold tank discharge pressure regulating valve 7 is used for controlling the connection and disconnection of the vacuum cold tank 1 and the outside, when the cold tank discharge pressure regulating valve 7 is opened, nitrogen is discharged from the vacuum cold tank 1, and the pressure in the vacuum cold tank 1 is reduced; the cold pot booster valve 8 is used for increasing the pressure in the vacuum Dewar 2; the Dewar decompression valve 10 is used for controlling the connection and disconnection of the vacuum Dewar 2 and the outside, when the Dewar decompression valve 10 is opened, nitrogen is discharged from the vacuum Dewar 2, and the pressure in the vacuum Dewar 2 is reduced; a dewar pressure increasing valve 9 is used to increase the pressure in the vacuum dewar 2.
The filling assembly is arranged between the vacuum cooling tank 1 and the outlet of the vacuum dewar 2, and as shown in fig. 2, the filling assembly comprises a pipeline communicated between the vacuum cooling tank 1 and the outlet of the vacuum dewar 2, and a filling electromagnetic valve 11 arranged on the pipeline. The import of filling assembly one end connection vacuum cold can 1, the export of the vacuum dewar 2 is connected to the other end to make vacuum cold can 1 and vacuum dewar 2 communicate.
The Dewar perfusion control valve 12 is arranged on the vacuum Dewar 2 and is used for controlling the opening and closing of an outlet of the vacuum Dewar 2.
The controller is used for receiving and processing data such as pressure data and liquid level data from the detection assembly. As shown in fig. 3, when the liquid level of the vacuum cooling tank 1 is lower than a first preset liquid level, the controller sends a command to the pressure regulating assembly to regulate the pressures inside the vacuum cooling tank 1 and the vacuum dewar 2 so that the pressure inside the vacuum dewar 2 is higher than the pressure inside the vacuum cooling tank 1, specifically: the controller sends an opening instruction to the pressure regulating valve 7 for discharging the cold tank, the pressure regulating valve 7 for discharging the cold tank is opened to enable the vacuum cold tank 1 to be communicated with the outside, and the pressure in the vacuum cold tank 1 is greater than the external pressure, so that the evaporated nitrogen in the vacuum cold tank 1 is discharged from the pressure regulating valve 7 for discharging the nitrogen from the cold tank, the pressure in the vacuum cold tank 1 is reduced, and when the pressure in the vacuum cold tank 1 is lower than a first preset pressure, the controller sends a closing instruction to the pressure regulating valve 7 for discharging the cold tank; meanwhile, the controller sends an opening instruction to the Dewar pressurizing valve 9, and the Dewar pressurizing valve 9 is opened so as to increase the pressure in the vacuum Dewar 2; through the steps, the fact that the pressure in the vacuum Dewar 2 is higher than the pressure in the vacuum cold tank 1 is achieved, when the pressure in the vacuum Dewar 2 is larger than the second preset pressure, the controller sends opening instructions to the Dewar filling control valve 12 and the filling electromagnetic valve 11 respectively, after the Dewar filling control valve 12 and the filling electromagnetic valve 11 are opened, the vacuum Dewar 2 is communicated with the vacuum cold tank 1, liquid nitrogen enters the vacuum cold tank 1 from the vacuum Dewar 2, and the liquid nitrogen filling system starts to fill. In the process of filling, the Dewar pressurizing valve 9 is kept in an open state, so that the liquid nitrogen backflow caused by the fact that the pressure in the vacuum cold tank 1 is larger than the pressure in the vacuum Dewar 2 because the pressure in the vacuum Dewar 2 is continuously reduced is avoided; meanwhile, the pressure in the vacuum cold tank 1 is monitored in real time in the filling process, when the pressure in the vacuum cold tank 1 is higher than a third preset pressure, the controller sends an opening instruction to the cold tank discharge pressure regulating valve 7 to reduce the pressure in the vacuum cold tank 1, and when the pressure in the vacuum cold tank 1 is lower than the first preset pressure again, the controller sends a closing instruction to the cold tank discharge pressure regulating valve 7; during the filling process, the liquid level of the liquid nitrogen in the vacuum cooling tank 1 is monitored in real time, as shown in fig. 4, when the liquid level of the liquid nitrogen in the vacuum cooling tank 1 reaches a second preset liquid level, the controller filling electromagnetic valve 11 sends a closing instruction, and after the liquid level in the vacuum cooling tank 1 is unchanged, the dewar filling control valve 12 and the dewar pressurizing valve 9 are closed, and the filling of the liquid nitrogen is finished. In the above scheme, the second preset pressure is greater than the third preset pressure.
In order to smoothly perform liquid nitrogen filling, the pressure in the vacuum cooling tank 1 is usually kept at a low value during filling, and after filling is completed, the vacuum cooling tank 1 needs to be pressurized in order to make the vacuum cooling tank 1 reach the working pressure, as shown in fig. 4. Specifically, after the pouring is finished, the pressure in the vacuum cold tank 1 is detected, when the pressure is smaller than a fifth preset pressure, the controller sends an opening command to the cold tank pressurization valve 8, and the cold tank pressurization valve 8 is opened so as to increase the pressure in the vacuum cold tank 1; when the pressure in the vacuum cold tank 1 reaches the fifth preset pressure, the controller sends a closing command to the cold tank pressurization valve 8, and the vacuum cold tank 1 finishes pressurization. Wherein the fifth preset pressure is within the working pressure range of the vacuum cold tank 1.
In order to smoothly perform liquid nitrogen filling, the pressure in the vacuum dewar 2 is usually set to a high value during filling, and as shown in fig. 4, after filling is completed, the vacuum dewar 2 needs to be depressurized in order to return the vacuum cold tank 1 to the working pressure. Specifically, after the perfusion is finished, the pressure in the vacuum dewar 2 is detected, when the pressure is greater than a fourth preset pressure value, the controller sends an opening command to the dewar pressure release valve 10, the dewar pressure release valve 10 is opened to communicate the vacuum dewar 2 with the outside, and because the pressure in the vacuum dewar 2 is greater than the external pressure, the nitrogen evaporated in the vacuum dewar 2 is discharged from the dewar pressure release valve 10, so that the pressure in the vacuum dewar 2 is reduced, and when the pressure in the vacuum dewar 2 is lower than the fourth preset pressure, the controller sends a closing command to the dewar pressure release valve 10. The fourth preset pressure is within the operating pressure range of the vacuum dewar 2.
In the scheme, the first preset liquid level is generally set as the corresponding liquid level height when the residual amount of liquid nitrogen in the vacuum cold tank 1 is 5%; the second preset liquid level is set as the corresponding liquid level height when the residual amount of the liquid nitrogen in the vacuum cold tank 1 is 95%.
In the scheme, the first preset pressure is 200 kPa-400 kPa; the second preset pressure is 800 kPa-1 MPa; the third preset pressure is 600 kPa-800 kPa; the fourth preset pressure is 800 kPa-900 kPa; the fifth preset pressure is 800 kPa-900 kPa, and the sixth preset pressure is 1.1MPa
In the above solution, in order to further optimize the perfusion process, the detection assembly further comprises a liquid nitrogen quick plug (refer to patent application No. 201920738090.2) arranged on the pipeline between the perfusion solenoid valve 11 and the outlet of said vacuum dewar 2, which sends the detection data to the controller. Before liquid nitrogen is filled, the pressure in the vacuum Dewar 2 is higher than the pressure in the vacuum cold tank 1 through the pressure adjusting assembly, when the pressure in the vacuum Dewar 2 is higher than a second preset pressure, the controller sends an opening instruction to the Dewar filling control valve 12, after the Dewar filling control valve 12 is opened, the vacuum Dewar 2 is communicated with the filling assembly, liquid nitrogen enters the filling assembly from the vacuum Dewar 2, when the liquid nitrogen quick plug detects the input of the liquid nitrogen and confirms that the liquid nitrogen normally inputs, the controller sends an opening instruction to the filling electromagnetic valve 11, after the filling electromagnetic valve 11 is opened, the vacuum cold tank 1 is communicated with the vacuum Dewar 2, the liquid nitrogen enters the vacuum cold tank 1 from the vacuum Dewar 2, and the liquid nitrogen filling system starts to fill.
In the above scheme, the installation direction of the filling electromagnetic valve 11 is opposite to the flow direction of the liquid nitrogen during filling, and this way can ensure that when the pressure in the vacuum cold tank 1 is higher than the external pressure, the liquid in the tank cannot flush the filling electromagnetic valve 11 to cause failure of the filling system.
In a preferred embodiment, as shown in fig. 2, in order to release the residual liquid nitrogen in the filling assembly, an overpressure relief solenoid valve 14 is provided on the pipeline between the filling solenoid valve 11 and the outlet of the vacuum dewar 2, and after the filling of the liquid nitrogen is finished, the overpressure relief solenoid valve 14 is opened to release the residual liquid nitrogen in the filling assembly. In order to better control the pressure in the perfusion assembly during perfusion, a third pressure sensor 6 is arranged on a pipeline between the perfusion solenoid valve 11 and the outlet of the vacuum dewar 2, the third pressure sensor 6 is used for detecting the pressure in the perfusion assembly and sending the detected pressure data to the controller, when the pressure in the perfusion assembly is higher than a sixth preset pressure, the controller sends an opening command to the overpressure relief solenoid valve 14, and the overpressure relief solenoid valve 14 is opened to relieve the pressure.
In the above solution, the overpressure relief solenoid valve 14 is in the same direction as the nitrogen bleed, preventing the liquid from flushing the valve causing system failure when the fill assembly internal pressure rises below the relief value.
In a preferred embodiment, in order to prevent the interface between the infusion assembly and the outlet of the vacuum dewar 2 from frost and freezing on the outside during the infusion process, the conduit connecting the infusion assembly and the outlet of the vacuum dewar 2 is provided as a vacuum infusion tube 15, which cannot be removed when it is necessary to remove it.
In a preferred embodiment, the detection assembly further comprises a second level gauge 16 arranged inside the vacuum dewar 2, the second level gauge 16 being adapted to detect the level of liquid nitrogen inside said vacuum dewar 2 and to send the detected level data to the controller. When the liquid level in the vacuum Dewar 2 is lower than a third preset liquid level, the controller gives an alarm to prompt the replacement of the vacuum Dewar 2. The third preset liquid level is usually set as the corresponding liquid level height when the residual amount of liquid nitrogen in the vacuum Dewar 2 is 10%;
in order to increase the safety of the liquid nitrogen filling system, a first safety valve 17 is arranged on the vacuum cooling tank 1, a second safety valve 18 is arranged on the vacuum dewar 2 and a third safety valve 19 is arranged on the filling assembly, wherein when the pressure in the vacuum cooling tank 1, the vacuum dewar 2 or the filling assembly is larger than the safety critical value, the safety valves arranged therein are opened for pressure relief.
In order to facilitate reading of the pressure in the vacuum cooling tank 1, a first pressure gauge 20 may be provided on the vacuum cooling tank 1 for displaying the pressure value in the vacuum cooling tank 1 measured by the first pressure sensor 4. To facilitate reading of the pressure in the vacuum dewar 2, a second pressure gauge 21 may be provided on the vacuum cold tank 1 for displaying the pressure value inside the vacuum dewar 2 measured by the second pressure sensor 5.
Finally, it should be noted that: the above embodiments and examples are only used to illustrate the technical solution of the present invention, but not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments and examples, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments or examples may still be modified, or some of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments or examples of the present invention.
Claims (10)
1. A liquid nitrogen infusion system, comprising: the vacuum cooling tank (1), the vacuum dewar (2) and the control system; the control system is used for detecting the pressure in the vacuum Dewar (2) and the pressure and the liquid level in the vacuum cold tank (1), and the control system is configured to adjust the pressure in the vacuum cold tank (1) and the pressure in the vacuum Dewar (2) when the liquid level in the vacuum cold tank (1) is lower than a first preset liquid level, so that the liquid nitrogen in the vacuum Dewar (2) is filled into the vacuum cold tank (1) when the pressure in the vacuum Dewar (2) is higher than the pressure in the vacuum cold tank (1).
2. The liquid nitrogen perfusion system of claim 1, wherein the control system comprises:
the detection assembly is used for detecting the pressure in the vacuum cooling tank (1), the pressure in the vacuum Dewar (2) and the liquid level in the vacuum cooling tank (1) and sending detected pressure data and liquid level data to a controller;
a pressure regulation assembly for regulating the pressure inside the vacuum cold tank (1) and the vacuum dewar (2);
the filling assembly comprises a pipeline and a filling electromagnetic valve (11), wherein the pipeline is communicated between the inlet of the vacuum cooling tank (1) and the outlet of the vacuum Dewar (2), and the filling electromagnetic valve controls the on-off of the pipeline;
a Dewar perfusion control valve (12) arranged on the vacuum Dewar (2) and used for controlling the opening and closing of an outlet of the vacuum Dewar (2); and
a controller for receiving and processing pressure data and liquid level data from the detection assembly, the controller being configured to control the pressure regulation assembly to regulate the pressure of the vacuum cold tank (1) and the vacuum dewar (2) such that the pressure of the vacuum dewar (2) is higher than the pressure of the vacuum cold tank (1) when the liquid level of the vacuum cold tank (1) is lower than a first preset liquid level; under the condition that the pressure of the vacuum Dewar (2) is higher than the pressure of the vacuum cold tank (1), the controller controls the filling electromagnetic valve (11) and the Dewar filling control valve (12) to be opened, so that liquid nitrogen in the vacuum Dewar (2) can be filled into the vacuum cold tank (1).
3. The liquid nitrogen perfusion system of claim 2, wherein the detection assembly comprises:
the number of the pressure sensors is at least two, the two pressure sensors are respectively arranged inside the vacuum cold tank (1) and the vacuum Dewar (2), and the two pressure sensors are respectively used for detecting the pressure in the vacuum cold tank (1) and the vacuum Dewar (2); and
the first liquid level meter (3) is arranged in the vacuum cooling tank (1) and is used for detecting the liquid level of liquid nitrogen in the vacuum cooling tank (1).
4. The liquid nitrogen perfusion system of claim 2 or 3, wherein the pressure regulation assembly comprises: the pressure regulating valve (7) for the discharge of the cold tank and the pressure increasing valve (8) for the cold tank are arranged on the vacuum cold tank (1) and used for regulating the air pressure in the vacuum cold tank (1); and
dewar charge-up valve (9) and Dewar relief valve (10), Dewar charge-up valve (9) with Dewar relief valve (10) all set up on vacuum Dewar (2), be used for adjusting pressure in vacuum Dewar (2).
5. The liquid nitrogen infusion system according to claim 2 or 3, characterized in that it further comprises a liquid nitrogen quick plug arranged on the line between the infusion solenoid valve (11) and the outlet of the vacuum dewar (2).
6. Liquid nitrogen infusion system according to claim 2 or 3, characterized in that it further comprises an overpressure relief solenoid valve (14), said overpressure relief solenoid valve (14) being arranged on a line between said infusion solenoid valve (11) and the outlet of said vacuum dewar (2).
7. The liquid nitrogen infusion system according to claim 2 or 3, characterized in that said infusion assembly further comprises a vacuum infusion tube (15), said vacuum infusion tube (15) being connected to an outlet of said vacuum dewar (2).
8. The liquid nitrogen perfusion system according to claim 2 or 3, characterized in that the detection assembly further comprises a second level gauge (16) arranged inside the vacuum dewar (2), the second level gauge (16) being intended to detect the level of liquid nitrogen inside the vacuum dewar (2).
9. The liquid nitrogen filling system according to claim 2 or 3, wherein the filling solenoid valve (11) is installed in a direction opposite to a flow direction of the liquid nitrogen during filling.
10. Liquid nitrogen filling system according to claim 6, wherein the overpressure relief solenoid valve (14) is installed in the same direction as the nitrogen gas is vented.
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|---|---|---|---|
| CN201921586554.9U CN210662293U (en) | 2019-09-23 | 2019-09-23 | Liquid nitrogen filling system |
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| CN201921586554.9U CN210662293U (en) | 2019-09-23 | 2019-09-23 | Liquid nitrogen filling system |
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| CN113324169A (en) * | 2021-07-12 | 2021-08-31 | 广州市粤佳气体有限公司 | Liquid helium filling process for lossless dewar tank of helium liquefier |
| CN113576649A (en) * | 2021-07-22 | 2021-11-02 | 海杰亚（北京）医疗器械有限公司 | Electrical control system for minimally invasive tumor treatment |
| CN113576649B (en) * | 2021-07-22 | 2022-08-23 | 海杰亚（北京）医疗器械有限公司 | Electrical control system for minimally invasive tumor treatment |
| CN115363738A (en) * | 2021-07-22 | 2022-11-22 | 海杰亚（北京）医疗器械有限公司 | Electrical control system for tumor minimally invasive treatment |
| CN115363738B (en) * | 2021-07-22 | 2023-09-22 | 海杰亚（北京）医疗器械有限公司 | Electric control system for tumor minimally invasive treatment |
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| CN114272969A (en) * | 2021-12-28 | 2022-04-05 | 北京半导体专用设备研究所（中国电子科技集团公司第四十五研究所） | Liquid nitrogen drainage device, liquid nitrogen drainage method and chip test system |
| CN115930095A (en) * | 2022-12-23 | 2023-04-07 | 成都西南交通大学设计研究院有限公司 | Liquid nitrogen filling device and method for magnetic-levitation train |
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