CN213177704U

CN213177704U - Liquid nitrogen transmission rod for low-temperature constant-temperature cavity

Info

Publication number: CN213177704U
Application number: CN202021934554.6U
Authority: CN
Inventors: 金炯�; 姜亚洲; 李存鑫
Original assignee: Zhejiang Saiweike Photoelectric Technology Co Ltd
Current assignee: Zhejiang Saiweike Photoelectric Technology Co Ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2021-05-11
Anticipated expiration: 2030-09-07

Abstract

The utility model discloses a liquid nitrogen transmission rod for a low-temperature constant-temperature cavity, which has the technical proposal that the liquid nitrogen transmission rod comprises a sleeve, one end of the sleeve is fixedly connected with a hollow pillar, the other end of the sleeve is fixedly connected with a bent pipe in a sealing way, a liquid inlet hole is arranged on the sleeve, the top surface of the hollow pillar is provided with a communication hole and a liquid outlet hole, a valve rod is connected with the communication hole in a threaded way, the valve rod extends upwards to penetrate through the bent pipe, the liquid nitrogen can flow into the communication hole through the liquid inlet hole and then flows to a liquid return pipe from the liquid outlet hole by rotating the valve rod, the liquid nitrogen enters a liquid transfer pipe through the liquid return pipe and then enters into equipment needing to be transferred, air in the equipment needing to be transferred is pumped out through a recovery welding pipe by a vacuum pump, the liquid nitrogen can smoothly enter the equipment, the evaporated liquid nitrogen in, vacuum heat insulation is formed, and heat conduction of liquid nitrogen in the liquid return pipe is prevented.

Description

Liquid nitrogen transmission rod for low-temperature constant-temperature cavity

Technical Field

The utility model relates to a liquid nitrogen transmission technical field, more specifically the liquid nitrogen transmission pole that is used for low temperature thermostatic chamber that says so relates to one kind.

Background

Under normal pressure, the temperature of liquid nitrogen is-196 ℃; 1 cubic meter of liquid nitrogen can be expanded to 696 cubic meters of pure gaseous nitrogen at 21 ℃. Liquid nitrogen is a colorless, odorless, low-temperature liquid and gas at high pressure. Liquid nitrogen (often written as LN2), is a liquid form formed by nitrogen at low temperatures. The boiling point of nitrogen is-196 ℃, and liquid nitrogen is formed at normal atmospheric pressure if the temperature is below that; if pressurized, liquid nitrogen can be obtained at higher temperatures; liquid nitrogen is at the in-process that is being transmitted, if because of the transmission distance is long, liquid nitrogen can carry out heat-conduction with outside air or equipment for liquid nitrogen temperature risees, and liquid nitrogen is invalid, at the liquid nitrogen transmission in-process, needs to ensure the constant temperature of liquid nitrogen.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a liquid nitrogen transmission pole for low temperature thermostatic chamber for ensure the constant temperature in the liquid nitrogen transmission course.

In order to achieve the above purpose, the utility model provides a following technical scheme: a liquid nitrogen transmission rod for a low-temperature constant-temperature cavity comprises a sleeve, wherein one end of the sleeve is fixedly connected with a hollow support column, the other end of the sleeve is fixedly connected with a bent pipe in a sealing manner, a liquid inlet hole is formed in the sleeve, a communication hole and a liquid outlet hole are formed in the top surface of the hollow support column, a valve rod is connected onto the communication hole in a threaded manner and extends upwards to penetrate through the bent pipe, an outer corrugated pipe is fixedly connected onto one end, away from the hollow support column, of the bent pipe, a recovery gas welding pipe is fixedly connected onto the bent pipe, an inner corrugated pipe is fixedly connected onto one end, located inside the bent pipe, of the recovery gas welding pipe, an outer pipe is fixedly connected onto one end, away from the bent pipe, a gas return pipe is sleeved inside the outer pipe, one end of the gas return pipe extends into the outer corrugated pipe and is, the one end of transfer line extends into in the recovery welded tube, retrieve the welded tube with interior bellows intercommunication, go out fixedly connected with liquid return pipe on the liquid hole, liquid return pipe extends into in the transfer line, the outer tube is kept away from the one end of outer bellows with it is sealed between the muffler, the muffler is kept away from the one end of outer bellows with it is sealed between the transfer line, the muffler includes external pipeline section and inside pipeline section, the through-hole has been seted up on the external pipeline section, the intercommunication is provided with the welded tube of bleeding on the outer bellows.

As a further improvement of the utility model, still include fixed subassembly, fixed subassembly includes first fixed part, second fixed part and third fixed part, first fixed part is located in the elbow, the second fixed part with the third fixed part is located in the outer bellows, first fixed part includes first fixed block and first T type piece, the second fixed part includes second fixed block and second T type piece, the third fixed part includes third fixed block and third T type piece, first fixed block with first T type piece cooperatees and is used for fixing the valve rod with return the liquid pipe, the second fixed block with second T type piece cooperatees and is used for fixing interior bellows with return the liquid pipe, the third fixed block with third T type piece cooperatees and is used for fixing return the liquid pipe with return the trachea.

As a further improvement, a plurality of supporting component is embedded on the inner wall of outer bellows, the supporting component is used for reducing the deformation of outer bellows.

As a further improvement of the utility model, the supporting component includes a plurality of arc, the arc is located in the crest of outer bellows, per two crest number between the arc is less than the one fifth of the total crest number of outer bellows.

As a further improvement, the outer tube is fixedly connected with a compression nut, and the compression nut is connected with a locking nut through threads.

As a further improvement of the utility model, the distance between the through hole and the liquid outlet end of the infusion tube is more than 20 times of the inner diameter of the through hole.

As a further improvement of the present invention, the inner diameter difference between the infusion tube and the air return tube is greater than 1/2 of the inner diameter of the infusion tube, and the inner diameter difference between the air return tube and the outer tube is greater than 1/2 of the inner diameter of the air return tube.

As a further improvement, the central axis of the liquid return pipe coincides with the central axis of the outer bellows, and the inner diameter of the outer bellows is 10 times or more of the inner diameter of the liquid return pipe.

The utility model has the advantages that: the utility model discloses well operating personnel is through rotating the valve rod, make the liquid nitrogen can flow in the intercommunicating pore through the feed liquor hole, then from going out liquid hole flow direction liquid return pipe, the liquid nitrogen gets into the transfer line through the transport of liquid return pipe, then the liquid nitrogen gets into in the equipment that needs transported by, will need be taken out by the air in the equipment of transport liquid nitrogen through retrieving welding pipe through a vacuum pump, make the air pressure in this equipment reduce, the liquid nitrogen can be smooth and easy get into in this equipment, and can take out the liquid nitrogen of the evaporation in this equipment, take out the air in the outer bellows through welding pipe of bleeding through another vacuum pump, form vacuum insulation, prevent the heat-conduction of liquid nitrogen in the liquid return pipe, reduce the loss of temperature in the liquid nitrogen.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

fig. 2 is a schematic top sectional structure of the present invention;

FIG. 3 is a side cross-sectional structural view of the present invention;

FIG. 4 is a schematic cross-sectional view of another aspect of the present invention;

fig. 5 is an enlarged schematic view of the present invention at a in fig. 4.

Reference numerals: 1. a sleeve; 101. a liquid inlet hole; 2. a hollow strut; 201. a communicating hole; 202. a liquid outlet hole; 3. bending the pipe; 4. an outer bellows; 5. recovering the gas welding pipe; 6. an inner bellows; 7. an outer tube; 701. an air return pipe; 711. a transfusion tube; 712. an outside pipe section; 713. an inner tube section; 714. a through hole; 702. welding a pipe by returning air; 8. a liquid return pipe; 9. welding a pipe by air suction; 10. a fixing assembly; 11. a first fixed block; 12. a first T-shaped block; 13. a second fixed block; 14. a second T-shaped block; 15. a third fixed block; 16. a third T-shaped block; 20. a support assembly; 21. an arc-shaped plate; 22. a compression nut; 23. locking the nut; 24. a valve stem; 25. And recovering the welded pipe.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

Referring to fig. 1 to 5, a liquid nitrogen transmission rod for a low-temperature and constant-temperature chamber according to this embodiment includes a sleeve 1, a hollow pillar 2 is fixedly connected to one end of the sleeve 1, an elbow 3 is fixedly connected to the other end of the sleeve 1 in a sealing manner, a liquid inlet hole 101 is formed in the sleeve 1, a communication hole 201 and a liquid outlet hole 202 are formed in a top surface of the hollow pillar 2, a valve rod 24 is connected to the communication hole 201 in a threaded manner, the valve rod 24 can be moved upward by an operator by rotating the valve rod 24, so that liquid nitrogen can enter the communication hole 201 through the liquid inlet hole 101 and then flow into a liquid return pipe 8 through the liquid outlet hole 202, the valve rod 24 extends upward through the elbow 3, an outer bellows 4 is fixedly connected to one end of the elbow 3 away from the hollow pillar 2, a recovered gas welding pipe 5 is fixedly connected to the elbow 3, an inner bellows 6 is fixedly connected to one end of the recovered gas, the distance between the elbow 3 and the outer tube 7 can be adjusted, in the adjusting process, the liquid return tube 8 slides in the infusion tube 711, the outer tube 7 is fixedly connected to one end, far away from the elbow 3, of the outer corrugated tube 4, the air return tube 701 is connected in the outer tube 7, one end of the air return tube 701 extends into the outer corrugated tube 4, the air return tube 701 and the outer tube 7 are arranged outside the infusion tube 711, the temperature loss of the infusion tube 711 in the liquid nitrogen conveying process is reduced, the recovery welding tube 25 is fixedly connected, the recovery welding tube 5 is connected with the vacuum pump, vacuum is formed by air suction of the vacuum pump, so that vacuum heat insulation is formed between the liquid return tube 8 and the outer corrugated tube 4, the temperature loss of liquid nitrogen in the conveying process is avoided, after the infusion tube 711 and the air return tube 701 are inserted into equipment needing to convey liquid nitrogen, air in the equipment needing to convey liquid nitrogen enters the air return tube 701 through the, the liquid nitrogen is pumped away by a vacuum pump through the outer pipe 7 and the inner corrugated pipe 6, in the process, the air pressure in equipment needing to convey the liquid nitrogen is reduced, so that the liquid nitrogen can be conveyed smoothly, the conveying capacity is stable in a unit time in the conveying process, gas generated by volatilization of the liquid nitrogen is pumped out through the through hole 714, the liquid conveying pipe 711 is sleeved in the gas return pipe 701, one end of the liquid conveying pipe 711 extends into the recovery welding pipe 25, the recovery welding pipe 25 is communicated with the inner corrugated pipe 6, the liquid outlet hole 202 is fixedly connected with the liquid return pipe 8, the liquid return pipe 8 extends into the liquid conveying pipe 711, the part, away from the outer corrugated pipe 4, of the outer pipe 7 is sealed with the gas return pipe 701, the part, away from the outer corrugated pipe 4, of the gas return pipe 701 is sealed with the liquid conveying pipe 711, so that air can be pumped out conveniently, the gas return pipe 701 comprises an outer pipe section 712 and an inner 713 pipe section, the outer, also connect another vacuum pump on the welded tube 9 of bleeding, take out the air between outer bellows 4 and the interior bellows 6 through this vacuum pump, form the vacuum, realize adiabatically, prevent to return the heat-conduction of liquid nitrogen in the liquid pipe 8, interior bellows 6 sets up to corrugated metal pipe, outer bellows 4 also can set up to corrugated metal pipe, prevent to take place deformation after forming the vacuum, through returning liquid pipe 8, the setting of internal diameters such as transfer line 711, can carry a small amount of liquid nitrogen, make the liquid nitrogen volume of carrying control easily.

Referring to fig. 2, 3 and 4, the fixing assembly 10 includes a first fixing portion, a second fixing portion and a third fixing portion, the first fixing portion is located in the bent pipe 3, the second fixing portion and the third fixing portion are located in the outer bellows 4, the first fixing portion includes a first fixing block 11 and a first T-shaped block 12, the second fixing portion includes a second fixing block 13 and a second T-shaped block 14, the third fixing portion includes a third fixing block 15 and a third T-shaped block 16, the first fixing block 11 and the first T-shaped block 12 cooperate to fix the valve rod 24 and the return pipe 8, the second fixing block 13 and the second T-shaped block 14 cooperate to fix the inner bellows 6 and the return pipe 8, the third fixing block 15 and the third T-shaped block 16 cooperate to fix the return pipe 8 and the return pipe 701, the second fixing portion and the third fixing portion are both disposed in the outer bellows 4, so that there is no height difference in a portion where the return pipe 8 is located in the outer bellows 4, make liquid return pipe 8 more stable to the transport of liquid nitrogen, the setting of first T type piece 12, second T type piece 14 and third T type piece 16 corresponds first fixed block 11, second fixed block 13 and third fixed block 15 respectively, be convenient for fix first T type piece 12 and first fixed block 11, second T type piece 14 and second fixed block 13, third T type piece 16 and third fixed block 15 are also so, and be convenient for fix liquid return pipe 8, interior bellows 6 and muffler 701, and make intercommunication between return bend 3 and the outer bellows 4, when the vacuum pump vacuumizes adiabatically, with the air in the return bend 3 also vacuum insulation.

Referring to fig. 2 and 4, a plurality of supporting members 20 are embedded on the inner wall of the outer bellows 4, and the supporting members 20 are used for reducing the deformation of the outer bellows 4. Supporting component 20 includes a plurality of arc 21, and arc 21 is located the crest of outer bellows 4, and the crest number between per two arcs 21 is less than the one fifth of the total crest number of outer bellows 4, ensures that arc 21 sets up the back, and outer bellows 4 can not take place deformation at the in-process of evacuation, influences the result of use.

Referring to fig. 1 and 4, a compression nut 22 is fixedly connected to the outer tube 7, and a lock nut 23 is threadedly connected to the compression nut 22. The locking nut 23 is used for being connected with equipment for conveying liquid nitrogen, and is convenient to disassemble.

Referring to fig. 1, 2 and 4, the distance between the through hole 714 and the liquid outlet end of the infusion tube 711 is greater than 20 times of the inner diameter of the through hole 714, and the distance between the through hole 714 and the liquid outlet end of the infusion tube 711 is set, so that the flow direction of liquid nitrogen is not influenced by air suction at the through hole 714 after the liquid nitrogen flows out from the liquid outlet end of the infusion tube 711, and air and evaporated liquid nitrogen enter the through hole 714.

Referring to fig. 1, 2 and 4, the difference in inner diameter between the infusion tube 711 and the return tube 701 is greater than 1/2 in the inner diameter of the infusion tube 711, and the difference in inner diameter between the return tube 701 and the outer tube 7 is greater than 1/2 in the inner diameter of the return tube 701, thereby ensuring the circulation of air and vaporized liquid nitrogen and also reducing the heat conduction of the liquid nitrogen in the infusion tube 711.

Referring to fig. 1, 2 and 4, the central axis of the liquid return pipe 8 coincides with the central axis of the outer bellows 4, and the inner diameter of the outer bellows 4 is 10 times or more the inner diameter of the liquid return pipe 8, thereby ensuring the effect of vacuum insulation formed in the outer bellows 4.

The working principle is as follows: an operator rotates the valve rod 24, the valve rod 24 opens the liquid inlet hole 101, liquid nitrogen can flow into the communication hole 201 through the liquid inlet hole 101, then flows to the liquid return pipe 8 from the liquid outlet hole 202, the sleeve 1 arranged outside the liquid return pipe 8 reduces temperature loss when the liquid nitrogen flows in the liquid return pipe 8, the liquid nitrogen enters the liquid transfer pipe 711 through the conveying of the liquid return pipe 8 and then enters the equipment to be conveyed, one vacuum pump extracts air in the equipment to be conveyed by the liquid nitrogen through the recycling welding pipe 25, air pressure in the equipment is reduced, the liquid nitrogen can smoothly enter the equipment and can extract evaporated liquid nitrogen in the equipment, the other vacuum pump extracts air in the outer corrugated pipe 4 through the air extracting welding pipe 9 to form vacuum heat insulation, temperature loss when the liquid nitrogen is conveyed in the outer corrugated pipe 4 section is reduced, and the liquid return pipe 8, The pipe section such as the pipe 711 has a small diameter, can convey a small amount of liquid nitrogen, and is easy to control the amount of liquid nitrogen conveyed.

Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A liquid nitrogen transmission rod for a low-temperature thermostatic chamber comprises a sleeve (1), and is characterized in that: the improved corrugated pipe joint is characterized in that one end of the sleeve (1) is fixedly connected with the hollow support column (2), the other end of the sleeve (1) is fixedly connected with the bent pipe (3) in a sealing manner, a liquid inlet hole (101) is formed in the sleeve (1), a communication hole (201) and a liquid outlet hole (202) are formed in the top surface of the hollow support column (2), a valve rod (24) is connected to the communication hole (201) in a threaded manner, the valve rod (24) extends upwards to penetrate through the bent pipe (3), the bent pipe (3) is far away from an outer corrugated pipe (4) fixedly connected with one end of the hollow support column (2), a recovery gas welding pipe (5) is fixedly connected to the bent pipe (3), the recovery gas welding pipe (5) is located an inner corrugated pipe (6) fixedly connected to one end of the bent pipe (3), the outer corrugated pipe (4) is far away from, a gas return pipe (701) is sleeved in the outer pipe (7), one end of the gas return pipe (701) extends into the outer corrugated pipe (4) and is fixedly connected with a recovery welded pipe (25), a liquid conveying pipe (711) is sleeved in the gas return pipe (701), one end of the liquid conveying pipe (711) extends into the recovery welded pipe (25), the recovery welded pipe (25) is communicated with the inner corrugated pipe (6), a liquid return pipe (8) is fixedly connected to the liquid outlet hole (202), the liquid return pipe (8) extends into the liquid conveying pipe (711), one end of the outer pipe (7), which is far away from the outer corrugated pipe (4), is sealed with the gas return pipe (701), one end of the gas return pipe (701), which is far away from the outer corrugated pipe (4), is sealed with the liquid conveying pipe (711), and the gas return pipe (701) comprises an external pipe section (712) and an internal pipe section (713), the external pipe section (712) is provided with a through hole (714), and the outer corrugated pipe (4) is communicated with an air exhaust welding pipe (9).

2. A liquid nitrogen transfer bar for a cryostat according to claim 1 wherein: still include fixed subassembly (10), fixed subassembly (10) includes first fixed part, second fixed part and third fixed part, first fixed part is located in return bend (3), the second fixed part with the third fixed part is located in outer bellows (4), first fixed part includes first fixed block (11) and first T type piece (12), the second fixed part includes second fixed block (13) and second T type piece (14), the third fixed part includes third fixed block (15) and third T type piece (16), first fixed block (11) with first T type piece (12) cooperate and are used for fixing valve rod (24) with return liquid pipe (8), second fixed block (13) with second T type piece (14) cooperate and are used for fixing inner bellows (6) with return liquid pipe (8), the third fixing block (15) is matched with the third T-shaped block (16) to fix the liquid return pipe (8) and the air return pipe (701).

3. A liquid nitrogen transfer bar for a cryostat according to claim 1 wherein: inlay on the inner wall of outer bellows (4) and be equipped with a plurality of supporting component (20), supporting component (20) are used for reducing the deformation of outer bellows (4).

4. A liquid nitrogen transfer bar for a cryostat according to claim 3 wherein: the supporting component (20) comprises a plurality of arc-shaped plates (21), the arc-shaped plates (21) are located in the wave crests of the outer corrugated pipe (4), and the number of the wave crests between every two arc-shaped plates (21) is smaller than one fifth of the total number of the wave crests of the outer corrugated pipe (4).

5. A liquid nitrogen transfer bar for a cryostat according to claim 1 wherein: the outer tube (7) is fixedly connected with a compression nut (22), and the compression nut (22) is connected with a locking nut (23) in a threaded mode.

6. A liquid nitrogen transfer bar for a cryostat according to claim 1 wherein: the distance between the through hole (714) and the liquid outlet end of the infusion tube (711) is more than 20 times of the inner diameter of the through hole (714).

7. A liquid nitrogen transfer bar for a cryostat according to claim 6 wherein: the difference of the inner diameters of the infusion tube (711) and the air return tube (701) is larger than 1/2 of the inner diameter of the infusion tube (711), and the difference of the inner diameters of the air return tube (701) and the outer tube (7) is larger than 1/2 of the inner diameter of the air return tube (701).

8. A liquid nitrogen transfer bar for a cryostat according to claim 1 wherein: the central axis of the liquid return pipe (8) coincides with the central axis of the outer corrugated pipe (4), and the inner diameter of the outer corrugated pipe (4) is more than 10 times of the inner diameter of the liquid return pipe (8).