Supercharged liquid nitrogen pump

Abstract

The utility model provides a supercharged liquid nitrogen pump. The supercharged liquid nitrogen pump comprises a liquid nitrogen suction part and a sealing and fixing part, the sealing fixing part comprises a mounting seat, an external thread ring, a pump plug, a thread pressing plate and a clamping ring; the pump plug is fixedly mounted at the bottom of the mounting seat, and the external thread ring is fixedly mounted at the top of the mounting seat; a plurality of grooves are formed in the outer edge of the mounting base, and L-shaped clamping jaws are rotationally mounted in the grooves; the mounting seat is detachably mounted at the top of the clamping ring through the clamping claws; the threaded pressing plate is positioned above the mounting seat; the liquid nitrogen suction part comprises a liquid suction ball, a vaporizing chamber, a connecting pipe, a gas return seat, a connecting pipe, a middle pipe, a liquid suction pipe and a liquid discharge valve; the liquid suction ball is fixedly mounted at the top of the vaporizing chamber; the bottom of the vaporizing chamber is sequentially connected with a connecting pipe, the gas return base, the connecting pipe, the middle pipe and the liquid suction pipe which are communicated with one another. According to the technical scheme, the liquid nitrogen pump and the liquid nitrogen tank can be rapidly and safely connected and fixed.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid nitrogen transmission, and in particular to a pressurized liquid nitrogen pump. Background Art

[0002] In existing technologies, liquid nitrogen, as a deep cryogen, can be used in fields such as rapid freezing of biological tissues, low-temperature physics research, and material characterization and analysis. Under laboratory conditions, a liquid nitrogen pump is usually used to extract liquid nitrogen from a liquid nitrogen tank into another container before it is used in related applications. Using a pouring method is not only inconvenient to operate but also poses a significant safety hazard. Manual liquid nitrogen pumps are primarily used in hospital departments, research institutes, and laboratories. They are simple liquid nitrogen extraction and output devices used with standard-caliber liquid nitrogen tanks.

[0003] Patent CN201320141286.6 discloses a liquid nitrogen pump, in which a return air pipe is placed inside an outer tube and outside an inner tube, one end of the return air pipe is connected to the vaporization chamber, and the other end is connected to the inner cavity of the pump plug after passing through the tube wall of the outer tube, thereby reducing the return air pipe from being affected by external factors and improving the vaporization efficiency. However, the connection position between the return air pipe and the liquid nitrogen tank does not have a quick-release and quick-install connection mechanism, and the installation of the liquid nitrogen pump is relatively slow and inconvenient to use. In addition, the liquid nitrogen pump is in a state of relatively low temperature during installation, and the vibration generated when the liquid nitrogen pump is working can easily damage the connection of the liquid nitrogen pump and easily destroy the tank mouth of the liquid nitrogen tank. Therefore, in order to overcome the above-mentioned technical problems and defects, it is urgent to design a manual booster liquid nitrogen pump so that the liquid nitrogen pump and the liquid nitrogen tank can be quickly and safely connected and fixed. Utility Model Content

[0004] In view of the above technical problems existing in the existing liquid nitrogen pump, a booster liquid nitrogen pump is provided, which adopts a connection mechanism with quick release and quick installation, so that the liquid nitrogen pump and the liquid nitrogen tank can be quickly and safely connected and fixed.

[0005] The technical means adopted by this utility model are as follows:

[0006] A booster liquid nitrogen pump comprises a liquid nitrogen suction part and a sealing and fixing part;

[0007] The sealing fixing part includes a mounting seat, an external threaded ring, a pump plug, a threaded pressure plate and a clamping ring; the pump plug is fixedly mounted on the bottom of the mounting seat, and the external threaded ring is fixedly mounted on the top; the pump plug is used to seal and mount on the tank mouth of the liquid nitrogen tank; a plurality of grooves are evenly arranged on the outer edge of the mounting seat along the circumference, and an L-shaped claw is rotatably mounted in the groove; the clamping ring and the tank mouth of the liquid nitrogen tank are integrally formed; the mounting seat is detachably mounted on the top of the clamping ring through the claw, and the bottom of the claw can be clamped and mounted on the lower edge of the clamping ring; the threaded pressure plate is located above the mounting seat; the threaded pressure plate is sleeved on the outside of the mounting seat through a clamping groove provided at the bottom that matches the mounting seat, and is threadedly connected to the external threaded ring through the threaded hole in the center;

[0008] The liquid nitrogen suction part includes a liquid suction ball, a vaporization chamber, a connecting pipe, a return air seat, a connecting pipe, an intermediate pipe, a liquid suction pipe and a drain valve; the liquid suction ball is fixedly installed on the top of the vaporization chamber; the bottom of the vaporization chamber is sequentially connected with the interconnected connecting pipe, the return air seat, the connecting pipe, the intermediate pipe and the liquid suction pipe; the connecting pipe passes through the threaded pressure plate, the external threaded ring and the mounting seat, and the bottom is fixedly connected to the mounting seat; the intermediate pipe can pass through the clamping ring and extend into the liquid nitrogen tank; the top of the intermediate pipe passes through the pump plug and is connected to the connecting pipe, and the bottom is connected to the liquid suction pipe through a thread; the drain valve is threadedly installed on the connecting pipe.

[0009] Furthermore, when the claw is installed on the retaining ring, the outer side wall can be aligned with the outer side wall of the mounting seat, so that after the threaded pressure plate is installed on the mounting seat, the inner side wall of the groove can fit with the outer side wall of the mounting seat to limit the claw.

[0010] Furthermore, the liquid nitrogen suction part also includes a dewatering pipe, a threaded cover and a threaded sleeve; one end of the dewatering pipe is connected to the drain valve, and the other end is fixedly connected to the threaded sleeve, and the threaded cover is threadedly connected to the threaded sleeve, and the threaded cover is used to seal the dewatering pipe.

[0011] Furthermore, the outer sleeve of the outlet tube is provided with a barrier sleeve.

[0012] Furthermore, the gasification chamber and the gas return seat are connected through a gas return pipe.

[0013] Furthermore, a fixed pipe 1 is fixed to the side wall of the vaporization chamber, and a fixed pipe 2 is fixed to the side wall of the return air seat. Both ends of the return air pipe are connected to the fixed pipe 1 and the fixed pipe 2 through flanges respectively, thereby connecting the vaporization chamber and the return air seat.

[0014] Furthermore, a pressure relief safety valve is installed on the top of the vaporization chamber, and a pressure gauge is installed on the connecting pipe.

[0015] Furthermore, a blind hole is provided on the outer side wall of the mounting seat, and a through hole is provided on the side wall of the slot at the bottom of the threaded pressure plate. When the threaded pressure plate is installed on the mounting seat, the threaded pressure plate and the mounting seat are fixedly connected by installing fixing pins on the blind hole and the through hole in relative positions.

[0016] Furthermore, the fixing pin is an L-shaped structure, and a limiting axis parallel to the other rod is provided on one of the rods of the L-shaped structure; a quarter-circular arc-shaped limiting hole is provided on the inner side wall of the through hole, and the limiting hole also includes a transverse opening located on the outer side wall of the slot, and the transverse opening matches the limiting axis; a rod provided with the limiting axis can be inserted into the blind hole through the through hole, and the limiting axis in a horizontal state can be inserted into the limiting hole through the transverse opening, and the other rod of the fixing pin rotates under the action of gravity, so that the limiting axis can rotate along the limiting hole and get stuck.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. The booster liquid nitrogen pump provided by the utility model has a simple and reasonable structure, and the liquid nitrogen pump and the liquid nitrogen tank can be quickly and safely connected and fixed; the sealing between the liquid nitrogen pump and the liquid nitrogen tank can be ensured by setting a pump plug, and the threaded pressure plate and the claws are used to achieve quick disassembly and quick assembly. The L-shaped claw is inserted into the bottom of the clamping ring, and the threaded pressure plate is used to limit the L-shaped claw, which can improve the disassembly and assembly efficiency and ensure the stable connection between the liquid nitrogen pump and the liquid nitrogen tank.

[0019] 2. The booster liquid nitrogen pump provided by the utility model uses a fixing pin to limit the tightened threaded pressure plate, which can prevent the threaded pressure plate from loosening under vibration and ensure safe use.

[0020] 3. The booster liquid nitrogen pump provided by the present invention can monitor the internal pressure during the use of the liquid nitrogen pump by setting a pressure gauge, and can promptly release the pressure when the pressure is too high by setting a pressure relief safety valve, thereby ensuring safe use.

[0021] Based on the above reasons, the utility model can be widely promoted in the field of liquid nitrogen transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 This is a schematic diagram of the structure of the booster liquid nitrogen pump described in this utility model Figure 1 .

[0024] Figure 2 This is a schematic diagram of the structure of the booster liquid nitrogen pump described in this utility model Figure 2 .

[0025] Figure 3 It is a structural schematic diagram of the liquid nitrogen pump and the liquid nitrogen tank of the utility model.

[0026] Figure 4 This is a schematic diagram of the explosion structure of the sealing fixing part of the utility model Figure 1 .

[0027] Figure 5 This is a schematic diagram of the explosion structure of the sealing fixing part of the utility model Figure 2 .

[0028] Figure 6 yes Figure 5 A magnified view of part I.

[0029] Figure 7 It is a front view of the fixing pin of the present utility model.

[0030] Figure 8 It is a side view of the fixing pin of the present invention.

[0031] In the figure: 1. Vaporization chamber; 2. Suction ball; 3. Pressure relief safety valve; 4. Return air pipe; 5. Threaded pressure plate; 6. Liquid nitrogen tank; 7. Barrier sleeve; 8. Lead-out pipe; 9. Pressure gauge; 10. Connecting pipe; 11. Threaded sleeve; 12. Threaded cover; 13. Return air seat; 14. Connecting pipe; 15. Fixed pipe 1; 16. Fixed pipe 2; 17. Snap ring; 18. Suction pipe; 19. Intermediate pipe; 20. Drain valve; 21. Mounting seat; 22. Claw; 23. Pump plug; 24. External threaded ring; 25. Slot; 26. Blind hole; 27. Through hole; 28. Fixing pin; 29. ​​Limit shaft; 30. Limit hole. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technology, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0036] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0037] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0038] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0039] Example 1

[0040] like Figure 1-5 As shown, the utility model provides a pressurized liquid nitrogen pump, comprising a liquid nitrogen suction part and a sealing and fixing part;

[0041] The sealing fixing portion includes a mounting seat 21, an externally threaded ring 24, a pump plug 23, a threaded pressure plate 5 and a snap ring 17; the pump plug 23 is fixedly installed on the bottom of the mounting seat 21, and the externally threaded ring 24 is fixedly installed on the top; the pump plug 23 is used to seal the tank mouth of the liquid nitrogen tank 6, and is used to seal the tank mouth of the liquid nitrogen tank 6; the outer edge of the mounting seat 21 is evenly provided with a plurality of grooves along the circumference, and an L-shaped claw 22 is rotatably installed in the groove by a rotating shaft; the snap ring 17 is integrally formed with the tank mouth of the liquid nitrogen tank 6; the mounting seat 21 is detachably mounted on the top of the snap ring 17 by the claw 22, and the bottom of the claw 22 can be snap-fitted and mounted on the lower edge of the snap ring 17; the threaded pressure plate 5 is located above the mounting seat 21; the threaded pressure plate 5 is sleeved on the outside of the mounting seat 21 through a groove 25 matched with the mounting seat 21 provided at the bottom, and is threadedly connected to the externally threaded ring 24 through a threaded hole in the center;

[0042] The liquid nitrogen suction part includes a liquid suction ball 2, a vaporization chamber 1, a connecting pipe 14, a return air seat 13, a connecting pipe 10, an intermediate pipe 19, a liquid suction pipe 18 and a drain valve 20; the liquid suction ball 2 is fixedly installed on the top of the vaporization chamber 1; the bottom of the vaporization chamber 1 is sequentially connected with the connecting pipe 14, the return air seat 13, the connecting pipe 10, the intermediate pipe 19 and the liquid suction pipe 18 which are interconnected; the connecting pipe 10 passes through the threaded pressure plate 5, the external threaded ring 24 and the mounting seat 21, and the bottom is fixedly connected to the mounting seat 21; the intermediate pipe 19 can pass through the retaining ring 17 and extend into the liquid nitrogen tank 6; the top of the intermediate pipe 19 passes through the pump plug 23 and is connected to the connecting pipe 10, and the bottom is threadedly connected to the liquid suction pipe 18; the drain valve 20 is threadedly mounted on the connecting pipe 14.

[0043] Furthermore, the liquid nitrogen suction part can absorb the liquid nitrogen in the liquid nitrogen tank 6 by kneading the liquid absorption ball 2: kneading the liquid absorption ball 2 can enable the liquid nitrogen in the liquid nitrogen tank 6 to be absorbed through the liquid absorption pipe 18 and the intermediate pipe 19, and discharged through the drain valve 20.

[0044] Furthermore, when the claw 22 is installed on the retaining ring 17, the outer side wall can be aligned with the outer side wall of the mounting seat 21, so that after the threaded pressure plate 5 is installed on the external threaded ring 24 and then installed on the mounting seat 21 by screwing, the inner side wall of the groove 25 can fit with the outer side wall of the mounting seat 21, thereby limiting the claw 22, so that the claw 22 can be stably stuck on the lower edge of the retaining ring 17, ensuring the stability of the liquid nitrogen pump during the process of absorbing liquid nitrogen, and avoiding shaking of the liquid nitrogen pump.

[0045] Furthermore, the mounting seat 21 , the pump plug 23 and the external threaded ring 24 are an integrated structure.

[0046] Working principle: When in use, first place the mounting seat 21 above the clamping ring 17, so that the intermediate tube 19 passes through the clamping ring 17 and extends into the liquid nitrogen tank 6, then insert the pump plug 23 into the tank mouth of the liquid nitrogen tank 6 for sealing, and make the mounting seat 21 press-fit on the top of the clamping ring 17, then rotate the claw 22 so that the claw 22 is buckled on the lower edge of the clamping ring 17, and the outer wall of the claw 22 is aligned with the outer wall of the mounting seat 21, then screw down the threaded pressure plate 5 so that the inner wall of the groove 25 is in contact with the outer wall of the mounting seat 21, so as to limit the claw 22, so that the mounting seat 21 is fixed to the top of the clamping ring 17 by the claw 22, and then open the drain valve 20, knead the liquid absorption ball 2, and the liquid nitrogen stored in the liquid nitrogen tank 6 is sucked through the liquid absorption tube 18 and the intermediate tube 19 under the action of air pressure, and discharged through the drain valve 20.

[0047] Example 2

[0048] In order to prevent the leakage of liquid nitrogen due to a failure of the drain valve 20, a lead-out structure is added to the liquid nitrogen suction part;

[0049] like Figure 2 As shown, the liquid nitrogen suction part further includes a derivation pipe 8, a threaded cap 12 and a threaded sleeve 11; one end of the derivation pipe 8 is connected to the drain valve 20, and the other end is fixedly connected to the threaded sleeve 11, and the threaded cap 12 is threadedly connected to the threaded sleeve 11, and the threaded cap 12 is used to seal the derivation pipe 8.

[0050] Furthermore, the drain valve 20 is fixedly connected to the outlet pipe 8 via a pipe clamp, and the other end of the outlet pipe 8 is integrally formed with the threaded sleeve 11 .

[0051] Furthermore, in order to avoid the low temperature of liquid nitrogen causing harm to operators, such as Figure 1 As shown, the outer cover of the outlet tube 8 is provided with a barrier sleeve 7 to play a role of heat insulation, thereby preventing the operator from being harmed by the low temperature generated by the liquid nitrogen when holding the outlet tube 8.

[0052] With the liquid nitrogen pump described in this embodiment, the liquid nitrogen discharged through the discharge valve 20 can be introduced into the container through the discharge pipe 8. The threaded cover 12 can seal the discharge pipe 8 when the discharge valve 20 fails and cannot be completely closed, thereby preventing the liquid nitrogen from leaking when the discharge valve 20 fails.

[0053] Example 3

[0054] like Figure 1-3 As shown, in order to facilitate gas reflux, the gasification chamber 1 and the gas return seat 13 are connected through a gas return pipe 4. When the gas content inside the gasification chamber 1 is high, it can flow back to the gas return seat 13 through the gas return pipe 4 to ensure safety.

[0055] Furthermore, a fixed pipe 15 is fixed to the side wall of the vaporization chamber 1, and a fixed pipe 2 16 is fixed to the side wall of the return air seat 13. The two ends of the return air pipe 4 are respectively connected to the fixed pipe 15 and the fixed pipe 2 16 through flanges, thereby connecting the vaporization chamber 1 and the return air seat 13.

[0056] Example 4

[0057] like Figure 1-2 As shown, in order to ensure the safety of use, a pressure relief safety valve 3 is threadedly installed on the top of the vaporization chamber 1, and a pressure gauge 9 is threadedly installed on the connecting pipe 14. The pressure gauge 9 can monitor the pressure inside the liquid nitrogen pump body. By setting the pressure relief safety valve 3, the pressure can be released in time when the pressure is too high, thereby ensuring the safety of the use of the liquid nitrogen pump body.

[0058] Example 5

[0059] like Figure 4-8 As shown, in order to further ensure safety, a blind hole 26 is provided on the outer wall of the mounting seat 21, and a through hole 27 is provided on the side wall of the slot 25 at the bottom of the threaded pressure plate 5. When the threaded pressure plate 5 is installed on the mounting seat 21, the threaded pressure plate 5 and the mounting seat 21 are fixedly connected by installing a fixing pin 28 on the blind hole 26 and the through hole 27 in relative positions.

[0060] Furthermore, in order to limit the fixing pin 28 and prevent it from falling off under vibration and other conditions, the fixing pin 28 is an L-shaped structure, and a limiting shaft 29 parallel to the other rod is provided on one of the rods of the L-shaped structure; a quarter-circular arc-shaped limiting hole 30 is provided on the inner wall of the through hole 27, and the limiting hole 30 also includes a transverse opening located on the outer wall of the slot 25, and the transverse opening matches the limiting shaft 29; a rod provided with the limiting shaft 29 can be inserted into the blind hole 26 through the through hole 27, and the limiting shaft 29 in a horizontal state can be inserted into the limiting hole 30 through the transverse opening, and the other rod of the fixing pin 28 rotates under the action of gravity, so that the limiting shaft 29 can rotate along the limiting hole 30 and get stuck.

[0061] When installing the fixing pin 28, a rod provided with the limiting shaft 29 is inserted into the blind hole 26 from the through hole 27, and the limiting shaft 29 in a horizontal state is inserted into the limiting hole 30 from the transverse opening. After the fixing pin 28 is inserted into place, the other rod will rotate to a vertical state under the action of gravity. During this process, the limiting shaft 29 can rotate and get stuck along the quarter-circular limiting hole 30, thereby achieving a fixed connection between the threaded pressure plate 5 and the mounting seat 21; since the limiting shaft 29 is limited by the limiting hole 30, the accidental situation of the fixing pin 28 falling off due to vibration can be avoided.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A booster liquid nitrogen pump, characterized in that: It includes a liquid nitrogen suction part and a sealing and fixing part; The sealing fixing part includes a mounting seat, an external threaded ring, a pump plug, a threaded pressure plate and a clamping ring; the pump plug is fixedly mounted on the bottom of the mounting seat, and the external threaded ring is fixedly mounted on the top; the pump plug is used to seal and mount on the tank mouth of the liquid nitrogen tank; a plurality of grooves are evenly arranged on the outer edge of the mounting seat along the circumference, and an L-shaped claw is rotatably mounted in the groove; the clamping ring and the tank mouth of the liquid nitrogen tank are integrally formed; the mounting seat is detachably mounted on the top of the clamping ring through the claw, and the bottom of the claw can be clamped and mounted on the lower edge of the clamping ring; the threaded pressure plate is located above the mounting seat; the threaded pressure plate is sleeved on the outside of the mounting seat through a clamping groove provided at the bottom that matches the mounting seat, and is threadedly connected to the external threaded ring through the threaded hole in the center; The liquid nitrogen suction part includes a liquid suction ball, a vaporization chamber, a connecting pipe, a return air seat, a connecting pipe, an intermediate pipe, a liquid suction pipe and a drain valve; the liquid suction ball is fixedly installed on the top of the vaporization chamber; the bottom of the vaporization chamber is sequentially connected with the interconnected connecting pipe, the return air seat, the connecting pipe, the intermediate pipe and the liquid suction pipe; the connecting pipe passes through the threaded pressure plate, the external threaded ring and the mounting seat, and the bottom is fixedly connected to the mounting seat; the intermediate pipe can pass through the clamping ring and extend into the liquid nitrogen tank; the top of the intermediate pipe passes through the pump plug and is connected to the connecting pipe, and the bottom is connected to the liquid suction pipe through a thread; the drain valve is threadedly installed on the connecting pipe.

2. The booster liquid nitrogen pump according to claim 1, characterized in that: When the claw is installed on the retaining ring, the outer side wall can be aligned with the outer side wall of the mounting seat, so that after the threaded pressure plate is installed on the mounting seat, the inner side wall of the groove can fit with the outer side wall of the mounting seat to limit the claw.

3. The booster liquid nitrogen pump according to claim 1, characterized in that: The liquid nitrogen suction part also includes a derivation pipe, a threaded cover and a threaded sleeve; one end of the derivation pipe is connected to the drain valve, and the other end is fixedly connected to the threaded sleeve, and the threaded cover is threadedly connected to the threaded sleeve, and the threaded cover is used to seal the derivation pipe.

4. The booster liquid nitrogen pump according to claim 3, characterized in that: The outer sleeve of the outlet pipe is provided with a barrier sleeve.

5. The booster liquid nitrogen pump according to claim 1, characterized in that: The gasification chamber is communicated with the gas return seat through a gas return pipe.

6. The booster liquid nitrogen pump according to claim 5, characterized in that: A fixed pipe 1 is fixed to the side wall of the vaporization chamber, and a fixed pipe 2 is fixed to the side wall of the return air seat. Both ends of the return air pipe are connected to the fixed pipe 1 and the fixed pipe 2 through flanges respectively, thereby connecting the vaporization chamber and the return air seat.

7. The booster liquid nitrogen pump according to claim 1, characterized in that: A pressure relief safety valve is installed on the top of the gasification chamber, and a pressure gauge is installed on the connecting pipe.

8. The booster liquid nitrogen pump according to claim 1, characterized in that: A blind hole is provided on the outer side wall of the mounting seat, and a through hole is provided on the side wall of the slot at the bottom of the threaded pressure plate. When the threaded pressure plate is installed on the mounting seat, the threaded pressure plate and the mounting seat are fixedly connected by installing fixing pins on the blind hole and the through hole in relative positions.

9. The booster liquid nitrogen pump according to claim 8, characterized in that: The fixing pin is an L-shaped structure, and a limiting axis parallel to the other rod is provided on one of the rods of the L-shaped structure; a quarter-circular arc-shaped limiting hole is provided on the inner side wall of the through hole, and the limiting hole also includes a transverse opening located on the outer side wall of the card slot, and the transverse opening matches the limiting axis; a rod provided with the limiting axis can be inserted into the blind hole through the through hole, and the limiting axis in a horizontal state can be inserted into the limiting hole through the transverse opening, and the other rod through the fixing pin rotates under the action of gravity, so that the limiting axis can rotate along the limiting hole and get stuck.

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