CN209838618U - Liquid nitrogen pump - Google Patents
Liquid nitrogen pump Download PDFInfo
- Publication number
- CN209838618U CN209838618U CN201920415660.4U CN201920415660U CN209838618U CN 209838618 U CN209838618 U CN 209838618U CN 201920415660 U CN201920415660 U CN 201920415660U CN 209838618 U CN209838618 U CN 209838618U
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- Prior art keywords
- liquid nitrogen
- pipe
- heater
- pump body
- nitrogen
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 280
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 140
- 239000007788 liquid Substances 0.000 title claims abstract description 127
- 238000007789 sealing Methods 0.000 claims description 5
- 238000000605 extraction Methods 0.000 abstract description 3
- 238000002309 gasification Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model belongs to the technical field of liquid nitrogen extraction and low-temperature control application, and discloses a liquid nitrogen pump, which comprises a pump body, a nitrogen taking pipe and a heater, wherein the nitrogen taking pipe comprises a liquid nitrogen conveying pipe, a liquid nitrogen pressurizing pipe, an adjusting ring and a heater sleeve; the fixed end of the liquid nitrogen pressurization pipe is connected with the pump body, and the free end of the liquid nitrogen pressurization pipe is connected with the heater sleeve; the liquid nitrogen delivery pipe is arranged in the liquid nitrogen pressurizing pipe, the fixed end of the liquid nitrogen delivery pipe is communicated with the pump body, and the free end of the liquid nitrogen delivery pipe is connected with the heater; the heater is arranged in the heater sleeve; the adjusting ring is arranged in the liquid nitrogen pressurizing pipe and sleeved on the liquid nitrogen conveying pipe, and the space between the liquid nitrogen pressurizing pipe and the liquid nitrogen conveying pipe is divided into a pressure cavity close to one side of the heater and a buffer cavity close to one side of the pump body. The utility model discloses not only significantly reduced the production and extruded the required gasification liquid nitrogen volume of liquid nitrogen, still improved the corresponding speed of extruding the liquid nitrogen greatly.
Description
Technical Field
The utility model belongs to the technical field of the extraction of liquid nitrogen and low temperature control application technique and specifically relates to a liquid nitrogen pump is related to.
Background
In recent years, with the rapid development of material characteristics, attention is paid to the characteristics of materials in a low-temperature environment. At present, most of low-temperature environments in the market are formed by utilizing the low-temperature characteristic of liquid nitrogen, and particularly, a certain amount of liquid nitrogen is taken out from a liquid nitrogen tank through a liquid nitrogen pump and is put into an experimental container, and then a test fixture is put into the container to perform low-temperature environment experiments.
The existing liquid nitrogen pump generally adopts a pressurizing mode to extrude liquid nitrogen from a liquid nitrogen tank, and the excellent mode is that the liquid nitrogen in the liquid nitrogen tank is heated to be gasified, the internal pressure of the liquid nitrogen tank is increased, and then the liquid nitrogen is extruded. The mode utilizes the self physical change of the liquid nitrogen to obtain the pressure, does not depend on the pressurization of other media, and does not influence the purity of the liquid nitrogen. However, the range of pressure increase is the whole liquid nitrogen tank, the range is large, the amount of liquid nitrogen to be gasified is large, the pressure rise is relatively slow, and in order to ensure the safety of the liquid nitrogen tank, redundant gaseous nitrogen is released through the pressure release valve, so that the waste of the liquid nitrogen is caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned technique not enough, provide a liquid nitrogen pump, for pumping the liquid nitrogen among the solution prior art, it is big to need gasified liquid nitrogen volume, the relatively slow technical problem of pressure rise.
In order to achieve the technical purpose, the technical scheme of the utility model provides a liquid nitrogen pump, which comprises a pump body, a nitrogen taking pipe and a heater, wherein the nitrogen taking pipe comprises a liquid nitrogen conveying pipe, a liquid nitrogen pressurizing pipe, an adjusting ring and a heater sleeve;
the fixed end of the liquid nitrogen pressurization pipe is connected with the pump body, and the free end of the liquid nitrogen pressurization pipe is connected with the heater sleeve;
the liquid nitrogen delivery pipe is arranged in the liquid nitrogen pressurizing pipe, the fixed end of the liquid nitrogen delivery pipe is communicated with the pump body, and the free end of the liquid nitrogen delivery pipe is connected with the heater; the heater is arranged in the heater sleeve;
the adjusting ring is arranged in the liquid nitrogen pressurizing pipe and sleeved on the liquid nitrogen conveying pipe, and the space between the liquid nitrogen pressurizing pipe and the liquid nitrogen conveying pipe is divided into a pressure cavity close to one side of the heater and a buffer cavity close to one side of the pump body.
Compared with the prior art, the beneficial effects of the utility model include: a space capable of forming local pressure is isolated in the liquid nitrogen tank through the liquid nitrogen pressurization pipe, the heater sleeve and the adjusting ring, so that the amount of gasified liquid nitrogen required by extruding the liquid nitrogen is greatly reduced, and the corresponding speed of extruding the liquid nitrogen is greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is an enlarged view at B in FIG. 1;
fig. 4 is an enlarged view at C in fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 4, the present invention provides a liquid nitrogen pump, which comprises a pump body 210, a nitrogen-taking tube 220 and a heater 230, wherein the nitrogen-taking tube 220 comprises a liquid nitrogen delivery tube 221, a liquid nitrogen pressurization tube 222, an adjusting ring 223 and a heater sleeve 224;
the fixed end of the liquid nitrogen pressurizing pipe 222 is connected with the pump body 210, and the free end is connected with the heater sleeve 224;
the liquid nitrogen delivery pipe 221 is disposed in the liquid nitrogen pressurization pipe 222, and a fixed end thereof is communicated with the pump body 210 and a free end thereof is connected with the heater 230; the heater 230 is disposed within the heater sleeve 224;
the adjusting ring 223 is disposed in the liquid nitrogen pressurizing pipe 222 and sleeved on the liquid nitrogen delivery pipe 221, and divides a space between the liquid nitrogen pressurizing pipe 222 and the liquid nitrogen delivery pipe 221 into a pressure chamber 220a near the heater 230 and a buffer chamber 220b near the pump body 210.
Before the liquid nitrogen pump is used, the adjusting ring 223 is moved to a proper position, namely the sizes of the pressure cavity 220a and the buffer cavity 220b are adjusted, so that the requirements of different releasing pressures are met. When the liquid nitrogen pump works, the heater 230 generates heat to gasify liquid nitrogen in the heater sleeve 224, so that a certain local pressure is formed in the pressure cavity 220a, and the pressure can extrude the liquid nitrogen into the liquid nitrogen delivery pipe 221 so as to be discharged through the pump body 210. Because the sectional area of the liquid nitrogen pressurizing pipe 222 is small, that is, the volume of the pressure cavity 220a is small, the pressure of the part is obviously influenced by the gasification of a small amount of liquid nitrogen, so that the amount of the liquid nitrogen required to be gasified is greatly reduced in order to extrude the liquid nitrogen, and the waste of the liquid nitrogen is reduced. Formally, because less liquid nitrogen needs to be gasified, the heating time of the heater 230 is short under the condition of a certain power, namely, the local pressure is boosted very quickly, and the output response rate of the liquid nitrogen pump is greatly accelerated. In addition, when the pressure in the liquid nitrogen tank is too high, the adjusting ring 223 can move towards the buffer chamber 220b under the influence of the pressure difference between the pressure chamber 220a and the buffer chamber 220b, i.e. the space of the buffer chamber 220b is squeezed, so as to relieve the whole pressure of the liquid nitrogen tank on the pressure chamber 220a side, and the protection effect is achieved.
A specific scheme is provided for the liquid nitrogen conveying pipe 221: the liquid nitrogen delivery pipe 221 includes a rigid pipe 221a and a flexible pipe 221b, a fixed end of the rigid pipe 221a communicates with the pump body 210, a free end thereof communicates with a fixed end of the flexible pipe 221b, and a free end of the flexible pipe 221b is connected to the heater 230. The rigid pipe 221a is made of metal and can be made of the same material as the pump body 210, and the rigid pipe 221a is mainly used for being in sealed communication with a pipeline of the pump body 210, does not need to be too long, and can extend into a tank opening of a liquid nitrogen tank. The flexible pipe 221b extends into the liquid nitrogen tank to connect the rigid pipe 221a and the heater 230, and is used for taking liquid nitrogen on one hand, and is used for isolating the rigid pipe 221a and the heater 230 on the other hand, because the expansion coefficient of the metal material is large, the metal material is embrittled by suddenly gaining heat under the extremely low temperature environment of the liquid nitrogen, and the service life is reduced.
On the basis of the scheme, the method provides further improvement: the free end of the rigid pipe 221a is a pagoda joint, and the fixed end of the flexible pipe 221b is sleeved on the pagoda joint. The pagoda joint is suitable for occasions using oil, water and air as media, and is convenient to assemble and disassemble and reliable in performance. The rigid tube 221a and the flexible tube 221b may also be connected by other ferrule.
In order to further improve the safety of the liquid nitrogen pump, the following specific scheme is provided: the liquid nitrogen pressurization pipe 222 is communicated with a pressure reducing valve of the pump body 210. When the pressure in the liquid nitrogen tank is too large, the buffer cavity 220b is not enough to be relieved, the buffer cavity 220b can be communicated with the atmosphere through the pressure reducing valve, the volume of the pressure cavity 220a is further increased to relieve the pressure in the liquid nitrogen tank, the adjusting ring 223 can isolate the environments on two sides like a piston, namely, the whole process of pressure relief can still keep the tightness of the environment in the liquid nitrogen tank, and the purity of liquid nitrogen in the tank is kept. Of course, a passage to a pressure relief valve or the outside may be opened near the extreme position of movement of the adjustment ring 223 to accommodate the extreme case of a liquid nitrogen tank where nitrogen has to be released outwards.
In order to improve the efficiency of liquid nitrogen extraction, one of the following optimization improvements is proposed for heater sleeve 224: an opening of the heater sleeve 224 is provided with a nitrogen taking hole 224 a. That is, the passage of liquid nitrogen into heater sleeve 224 is increased, and it is desirable that nitrogen hole 224a be located as close as possible to the opening of heater sleeve 224, of course, in order not to interfere with the effect of creating a partial pressure within pressure chamber 220 a. As more specific: the nitrogen intake hole 224a is a long hole extending from the opening of the heater bushing 224 to the liquid nitrogen pressurizing pipe 222.
In order to facilitate the quick connection of the liquid nitrogen pump and the liquid nitrogen tank, the following specific scheme is provided: the pump body 210 is connected with the jar mouth of liquid nitrogen container 100 through clamp 300, the pump body 210 bottom be with the jar mouth of liquid nitrogen container 100 suit and with clamp 300 matched with connecting seat 211, connecting seat 211 is equipped with seal groove 212, be equipped with sealing washer 213 in the seal groove 212. The clamp structure can realize simple and quick assembly and disassembly, is easy to operate, and has good sealing performance under the matching of the sealing groove 212 and the sealing ring 213.
The above description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a liquid nitrogen pump, includes the pump body, gets nitrogen pipe and heater, its characterized in that: the nitrogen taking pipe comprises a liquid nitrogen conveying pipe, a liquid nitrogen pressurizing pipe, an adjusting ring and a heater sleeve;
the fixed end of the liquid nitrogen pressurization pipe is connected with the pump body, and the free end of the liquid nitrogen pressurization pipe is connected with the heater sleeve;
the liquid nitrogen delivery pipe is arranged in the liquid nitrogen pressurizing pipe, the fixed end of the liquid nitrogen delivery pipe is communicated with the pump body, and the free end of the liquid nitrogen delivery pipe is connected with the heater; the heater is arranged in the heater sleeve;
the adjusting ring is arranged in the liquid nitrogen pressurizing pipe and sleeved on the liquid nitrogen conveying pipe, and the space between the liquid nitrogen pressurizing pipe and the liquid nitrogen conveying pipe is divided into a pressure cavity close to one side of the heater and a buffer cavity close to one side of the pump body.
2. The liquid nitrogen pump according to claim 1, wherein: the liquid nitrogen conveying pipe comprises a rigid pipe and a flexible pipe, the fixed end of the rigid pipe is communicated with the pump body, the free end of the rigid pipe is communicated with the fixed end of the flexible pipe, and the free end of the flexible pipe is connected with the heater.
3. The liquid nitrogen pump according to claim 2, characterized in that: the free end of the rigid pipe is a pagoda joint, and the fixed end of the flexible pipe is sleeved on the pagoda joint.
4. The liquid nitrogen pump according to claim 1, wherein: the liquid nitrogen pressurization pipe is communicated with a pressure reducing valve of the pump body.
5. The liquid nitrogen pump according to claim 1, wherein: and a nitrogen taking hole is formed at the opening of the heater sleeve.
6. The liquid nitrogen pump according to claim 5, wherein: the nitrogen taking hole is a long hole extending from the opening of the heater sleeve to the liquid nitrogen pressurization pipe.
7. The liquid nitrogen pump according to claim 1, wherein: the pump body passes through clamp connection with the jar mouth of liquid nitrogen container, pump body bottom for with the jar mouth of liquid nitrogen container suit and with clamp matched with connecting seat, the connecting seat is equipped with the seal groove, be equipped with the sealing washer in the seal groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920415660.4U CN209838618U (en) | 2019-03-29 | 2019-03-29 | Liquid nitrogen pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920415660.4U CN209838618U (en) | 2019-03-29 | 2019-03-29 | Liquid nitrogen pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209838618U true CN209838618U (en) | 2019-12-24 |
Family
ID=68908825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920415660.4U Active CN209838618U (en) | 2019-03-29 | 2019-03-29 | Liquid nitrogen pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209838618U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115247643A (en) * | 2021-04-25 | 2022-10-28 | 中国科学院理化技术研究所 | A liquid hydrogen booster pump performance test platform and test method |
-
2019
- 2019-03-29 CN CN201920415660.4U patent/CN209838618U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115247643A (en) * | 2021-04-25 | 2022-10-28 | 中国科学院理化技术研究所 | A liquid hydrogen booster pump performance test platform and test method |
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