CN219368082U - Negative pressure liquid nitrogen/liquid oxygen subcooler system - Google Patents
Negative pressure liquid nitrogen/liquid oxygen subcooler system Download PDFInfo
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- CN219368082U CN219368082U CN202222878841.5U CN202222878841U CN219368082U CN 219368082 U CN219368082 U CN 219368082U CN 202222878841 U CN202222878841 U CN 202222878841U CN 219368082 U CN219368082 U CN 219368082U
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- subcooler
- liquid nitrogen
- container
- heat exchanger
- negative pressure
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Abstract
The utility model discloses a negative pressure liquid nitrogen/liquid oxygen subcooler system which comprises a liquid nitrogen source, a subcooler container, a heat exchanger, a vacuum tank and an air extraction system, wherein the subcooler container comprises a body part and a neck part, the heat exchanger is arranged on the body part and forms an inlet interface and an outlet interface on the neck part, a cylindrical heat insulation shield is arranged in the vacuum tank, the body part of the subcooler container is arranged in the cylindrical heat insulation shield, the air extraction system is used for vacuumizing the vacuum tank and the subcooler container, the liquid nitrogen source is used for supplying liquid nitrogen for the subcooler container, and the inlet interface of the heat exchanger is used for connecting the liquid nitrogen source or the liquid oxygen source. The utility model can reduce the heat loss of the subcooler container, reduce the pressure in the subcooler container, enable the temperature of the liquid nitrogen passing through the heat exchanger to reach the preset temperature quickly, and simultaneously facilitate the operation of the temperature measuring element of the subcooler container and improve the experimental efficiency.
Description
Technical Field
The utility model relates to a subcooler, in particular to a negative pressure liquid nitrogen/liquid oxygen subcooler system.
Background
In order to improve the vacuum degree of the vacuum environment experiment and meet the requirement of the experiment on the environment temperature, the temperature is generally controlled by a heat sink. The heat sink is filled with liquid nitrogen to realize low-temperature control, the temperature of the liquid nitrogen under normal pressure is 77K, and the liquid nitrogen remained by the heat sink is cooled continuously by adopting liquid nitrogen, namely, the heat sink can reduce the environmental temperature to the minimum value of 77K. The prior art utilizes a negative pressure subcooler to further reduce the liquid nitrogen temperature to achieve a lower ambient temperature. The structure of the negative pressure subcooler comprises a subcooler container and a heat exchanger, liquid nitrogen is introduced into the subcooler container, and the heat exchanger is arranged in the liquid nitrogen. In some experiments, it is required to grasp the supercooling degree distribution of the liquid nitrogen in the subcooler container in real time, generally, a temperature sensor is attached to the wall outside the subcooler container to monitor the temperature, and meanwhile, a heat insulation material is coated on the wall outside the subcooler container to reduce the heat exchange between the liquid nitrogen in the subcooler and the outside through the wall. Because the position of the temperature sensor on the wall of the wall needs to be changed frequently according to the experiment requirement, the position of the temperature sensor is difficult to change after the heat insulating material is coated, and the operation efficiency of the experiment is seriously affected.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides a negative pressure liquid nitrogen/liquid oxygen subcooler system, and aims to solve the problem of low experimental efficiency caused by difficult adjustment of temperature measuring points on the wall of a subcooler container.
The technical scheme of the utility model is as follows: the utility model provides a negative pressure liquid nitrogen/liquid oxygen subcooler system, includes liquid nitrogen source, subcooler container, heat exchanger to and including vacuum tank and air extraction system, the subcooler container include body portion and neck, the heat exchanger set up in body portion and neck formation entry interface and export interface, be equipped with cylindric adiabatic shield in the vacuum tank, subcooler container's body portion set up in the cylindric adiabatic shield, air extraction system be used for the vacuum tank with subcooler container evacuation, the liquid nitrogen source is the subcooler container supplies liquid nitrogen, the entry interface of heat exchanger is used for connecting liquid nitrogen source or liquid oxygen source.
Further, the inner side wall of the cylindrical insulating shield is provided with a heater. The arrangement of the heater can accelerate the vaporization of liquid nitrogen in the subcooler, quickly return the temperature and avoid frosting and condensation when the liquid nitrogen is taken out from the vacuum tank.
Further, the vacuum tank is vertical, the vacuum tank comprises a tank body and a top cover, the neck of the subcooler container is fixedly connected with the top cover, and the cylindrical heat insulation shield is arranged in the tank body. By connecting the subcooler container with the top cover, the subcooler container can be lifted out together when the top cover is lifted, so that the temperature measuring element arranged outside the wall of the subcooler container can be operated conveniently.
Further, for convenience to operate the heat exchanger, the neck includes fixed section and dismantlement section, fixed section with top cap fixed connection, dismantlement section pass through the flange with fixed section butt joint and be located the top of top cap, entry interface and exit interface set up in dismantlement section.
Further, the neck is provided with an injection port, an exhaust port and an extraction port, the liquid nitrogen source supplies liquid nitrogen for the subcooler container through the injection port, the extraction port is connected with the extraction system through an extraction valve, the extraction system is used for depressurizing the subcooler container, and a nitrogen heater is arranged on a connecting pipeline of the extraction valve and the extraction system.
Further, the heat exchanger is a spiral fin type heat exchanger.
The technical scheme provided by the utility model has the advantages that:
the subcooler container is arranged in the vacuum tank with the cylindrical insulating shield, the vacuum tank is vacuumized, the subcooler container and the cylindrical insulating shield are matched to form an insulating environment, heat loss is reduced, liquid nitrogen in the internal heat exchanger is reduced, and meanwhile, as the outer wall of the subcooler container is not required to be directly provided with an insulating material, the arrangement of temperature measuring elements of temperature measuring points on the outer wall of the subcooler container is facilitated, the temperature distribution and the temperature change under the subcooler condition of the subcooler are monitored conveniently in real time, and the experimental operation efficiency is improved. The subcooler container is connected with the top cover, and the top cover of the vacuum tank can be lifted and lowered, so that the subcooler container is conveniently taken and placed from the vacuum tank, the heat exchanger is further connected to the disassembling section of the neck of the subcooler container, the heat exchanger can be conveniently taken and placed from the subcooler container, and the operation convenience is improved.
Drawings
Fig. 1 is a schematic diagram of the structure of a negative pressure liquid nitrogen subcooler system.
Detailed Description
The present utility model is further described below with reference to examples, which are to be construed as merely illustrative of the present utility model and not limiting of its scope, and various modifications to the equivalent arrangements of the present utility model will become apparent to those skilled in the art upon reading the present description, which are within the scope of the appended claims.
Referring to fig. 1, a negative pressure liquid nitrogen/liquid oxygen subcooler system according to an embodiment of the present utility model comprises a liquid nitrogen source 1, a subcooler container 2, a heat exchanger 3, a vacuum tank 4, an air extraction system 5 and various control valves. The subcooler container 2 is used as a heat exchange container for storing liquid nitrogen which exchanges heat with the heat exchanger 3 and for placing the heat exchanger 3. The subcooler container 2 includes a body portion 201 and a neck portion 202, the body portion 201 is in a can shape, the neck portion 202 is connected to the top surface of the body portion 201, the neck portion 202 is in a column shape and fixedly connected to the body portion 201, and an inner space of the neck portion 202 is communicated with an inner space of the body portion 201. In order to facilitate the handling of the heat exchanger 3, mainly to arrange temperature measuring elements on the surface of the heat exchanger 3 and to adjust the positions of the elements, the heat exchanger 3 needs to be easily removable from the subcooler container 2.
The neck 202 of the subcooler container 2 is divided into two sections, namely a fixed section 202a and a detachable section 202b, wherein the fixed section 202a and the detachable section 202b are provided with butt flanges, and the detachable section 202b is fixedly connected above the fixed section 202a through the butt flanges. The heat exchanger 3 adopts a pure copper spiral fin type heat exchanger, copper has high heat conductivity and is not easy to corrode, the heat exchange efficiency of the heat exchanger 3 is effectively improved, and the service life is prolonged. The heat exchanger 3 is fixedly connected to the detachable section 202b of the neck 202, and two connection ports, an inlet port 6 and an outlet port 7, are formed on the fixed section 202 b. Liquid nitrogen required to be supplied to the heat sink flows into the heat exchanger 3 from the inlet interface 6 and then flows out from the outlet interface 7 to be supplied to the heat sink. When the detachable section 202b is connected to the fixed section 202a, the coil portion of the heat exchanger 3 protrudes downward into the body portion 201 of the subcooler container 2. A liquid nitrogen injection pipe 8, an extraction port 9, and an exhaust port 10 are also connected to the detachable section 202b of the neck 202, the exhaust port 10 is connected to the purge valve 11, and the liquid nitrogen injection pipe 8 also extends into the body 201 of the subcooler container 2.
The liquid nitrogen supply tank is connected to the liquid nitrogen injection pipe 8 through the liquid level control solenoid valve 12 as a liquid nitrogen source 1 for supplying liquid nitrogen to the subcooler container 2 and the heat exchanger 3, respectively, and injects liquid nitrogen into the body portion 201 of the subcooler container 2. At the same time, the liquid nitrogen supply tank is also connected to the inlet port 6 of the neck 202 of the subcooler container 2 through the shut-off valve 13 and the low-temperature regulating valve 14 to inject liquid nitrogen into the heat exchanger 3. Pressure, temperature and flow sensors are provided on the line between the thermostatic valve 14 and the inlet port 6 to monitor the parameters of the liquid nitrogen fed to the heat exchanger 3. A second shut-off valve 13' is connected in parallel with the shut-off valve 13 before the low-temperature control valve 14, and the liquid oxygen source is connected to the second shut-off valve 13', and the shut-off valve 13 is closed, and the liquid oxygen can be cooled by opening the second shut-off valve 13 '.
In this embodiment, in order to reduce heat loss of the subcooler container 2, a vacuum tank 4 is provided, which includes a tank body 401 and a top cover 402, the vacuum tank 4 is vertically disposed, that is, the top cover 402 is disposed above the tank body 401, and opening and closing of the vacuum tank 4 are completed by lifting and lowering the top cover 402. The fixed section 202a of neck 202 of subcooler container 2 is fixedly connected to top cover 402, and during lifting of top cover 402, subcooler container 2 is lifted in synchronization with top cover 402. A cylindrical heat insulating cover 15 is provided in the tank 401, and the body 201 of the subcooler container 2 is positioned in the cylindrical heat insulating cover 15. At the same time, in order to assist the rapid temperature return of the superheater vessel 2, a heater 16 is also provided inside the cylindrical insulating shield 15. The vacuum tank 4 and the subcooler container 2 share a set of air extraction system 5 for air extraction. The air extraction system 5 comprises a main extraction valve 17, an air release valve 18, a pre-extraction valve 19, a molecular pump 20, a backing valve 21, a mechanical pump 22 and the like. The main pump valve 17 is followed by a molecular pump 20, a backing valve 21 and a mechanical pump 22. The front part of the main suction valve 17 is divided into two paths, one path is directly connected with the vacuum tank 4, the other path is connected with the suction valve 23 connected with the suction port 9 of the subcooler container 2 through the pre-suction valve 19, and a nitrogen heater 24 is arranged on a pipeline between the suction valve 23 and the pre-suction valve 19. The air release valve 18 is connected to the line branch between the pre-pump valve 19 and the main pump valve 17, and the air extraction valve 23 is directly connected to the air extraction path of the mechanical pump 22 in addition to the pre-pump valve 19.
Taking the example that the heat exchanger provides liquid nitrogen, the use process of the negative pressure liquid nitrogen subcooler system of the embodiment is as follows: the vacuum tank 4 is first evacuated to a high vacuum, below 1 x 10, by the evacuation system 5 -4 Pa, opening an emptying valve 11 on the subcooler container 2, then opening a liquid level control electromagnetic valve 12, injecting liquid nitrogen into the subcooler container 2 from a liquid nitrogen supply tank, discharging vaporized nitrogen through the emptying valve 11, and introducing liquid nitrogen into the heat exchanger 3 when the liquid nitrogen in the subcooler container 2 submerges the heat exchanger 3 and the temperature in the heat exchanger 3 is reduced to about 80K; the liquid nitrogen outlet valve of the liquid nitrogen supply tank is opened, and the stop valve 13 and the low-temperature regulating valve 14 are opened, so that liquid nitrogen flows into the heat exchanger 3 from the inlet port 6, wherein the low-temperature regulating valve 14 is used for regulating the flow rate of the liquid nitrogen. Liquid nitrogen in the heat exchanger 3 flows out from the outlet interface 7 after being cooled by liquid nitrogen in the cooler container 2; the temperature of the liquid nitrogen at the outlet interface 7 is about 77K under the normal pressure environment. At this time, the air release valve 11 is closed, the main air extraction valve 17 is closed, the air extraction valve 23 is opened, the nitrogen heater 24 is opened for heating, the air extraction system 5 decompresses the subcooler container 2 to enable liquid nitrogen to be in a supercooled state under the action of negative pressure, so that the temperature of the liquid nitrogen at the outlet interface 7 is lower than 77K, and the supercooled liquid nitrogen can be used for heat sink cooling (lower than 77K) of a space environment simulation system or propellant supply of a propellant tank simulation system. When the position of the temperature measuring matrix arranged on the subcooler container 2 needs to be adjusted, the subcooler can be arranged on the cylinderThe heat-insulating shield 15 is internally provided with a heater 16 for rewarming the subcooler container 2, and then the vacuum tank 4 is opened at the top cover 402 to take out the subcooler container 2 and perform corresponding operation, so that the test efficiency is improved.
Claims (6)
1. The utility model provides a negative pressure liquid nitrogen/liquid oxygen subcooler system, includes liquid nitrogen source, subcooler container, heat exchanger, its characterized in that includes vacuum tank and air exhaust system, the subcooler container includes body portion and neck, the heat exchanger set up in body portion and neck form entry interface and export interface, be equipped with cylindric adiabatic shield in the vacuum tank, subcooler container's body portion set up in cylindric adiabatic shield, air exhaust system is used for the vacuum tank reaches subcooler container evacuation, the liquid nitrogen source is the subcooler container supplies liquid nitrogen, the entry interface of heat exchanger is used for connecting liquid nitrogen source or liquid oxygen source.
2. The negative pressure liquid nitrogen/liquid oxygen subcooler system of claim 1 wherein the inside wall of the cylindrical insulating shield is provided with a heater.
3. The negative pressure liquid nitrogen/liquid oxygen subcooler system of claim 1 wherein the vacuum tank is a vertical arrangement, the vacuum tank comprises a tank body and a top cap, the neck of the subcooler container is fixedly connected to the top cap, and the cylindrical insulating shield is disposed within the tank body.
4. The negative pressure liquid nitrogen/liquid oxygen subcooler system of claim 3 wherein the neck comprises a fixed section and a detachable section, the fixed section fixedly connected to the top cover, the detachable section interfacing with the fixed section via a flange and being located above the top cover, the inlet and outlet ports being provided in the detachable section.
5. The negative pressure liquid nitrogen/liquid oxygen subcooler system according to claim 1, wherein the neck is provided with an injection port, an exhaust port and an extraction port, the liquid nitrogen source supplies liquid nitrogen to the subcooler container through the injection port, the extraction port is connected with the extraction system through an extraction valve, the extraction system is used for depressurizing the subcooler container, and a nitrogen heater is arranged on a connecting line of the extraction valve and the extraction system.
6. The negative pressure liquid nitrogen/liquid oxygen subcooler system of claim 1 wherein the heat exchanger is a spiral fin heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222878841.5U CN219368082U (en) | 2022-10-31 | 2022-10-31 | Negative pressure liquid nitrogen/liquid oxygen subcooler system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222878841.5U CN219368082U (en) | 2022-10-31 | 2022-10-31 | Negative pressure liquid nitrogen/liquid oxygen subcooler system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219368082U true CN219368082U (en) | 2023-07-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222878841.5U Active CN219368082U (en) | 2022-10-31 | 2022-10-31 | Negative pressure liquid nitrogen/liquid oxygen subcooler system |
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| CN (1) | CN219368082U (en) |
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2022
- 2022-10-31 CN CN202222878841.5U patent/CN219368082U/en active Active
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