CN107806537B

CN107806537B - Cryogenic transfer line

Info

Publication number: CN107806537B
Application number: CN201711051720.0A
Authority: CN
Inventors: 谢秀娟; 邓笔财; 杨少柒; 李青; 潘薇; 龚领会
Original assignee: Technical Institute of Physics and Chemistry of CAS
Current assignee: Technical Institute of Physics and Chemistry of CAS
Priority date: 2017-10-31
Filing date: 2017-10-31
Publication date: 2023-05-23
Anticipated expiration: 2037-10-31
Also published as: CN107806537A

Abstract

A cryogenic transfer line comprising an inner tube and an outer tube; the inner pipe is arranged in the outer pipe; the outer tube includes first body, second body and locates the outer tube between first body and the second body, and first flange subassembly and first body coupling are passed through to the one end of outer tube, and the other end of outer tube passes through second flange subassembly and second body coupling, and the middle part of outer tube is equipped with the bellows, and the outer tube is portable for first body and second body. The low-temperature transmission pipeline combines the sealing, cold insulation and detachable performances of the vacuum low-temperature transmission pipeline. The outer sleeve can be simply and conveniently opened by adopting the improved flange structure, the outer sleeve is fastened by the bolts, the problem of tightness caused by the detachable characteristic is solved, the pretightening force of the bolts connected with the flange can be compensated by arranging the corrugated pipe in the middle of the outer sleeve, the required dimensional errors during installation and detachment can be simply and conveniently regulated, and the stability and reliability of flange connection sealing are ensured.

Description

Cryogenic transfer line

Technical Field

The invention relates to the technical field of low-temperature working medium transportation, in particular to a low-temperature transmission pipeline.

Background

The low-temperature transmission pipeline is commonly used for transmitting low-temperature working media, including liquid helium, liquid nitrogen, liquid oxygen, liquefied natural gas and the like, and is widely applied to engineering practice. In order to ensure the heat insulation performance of the low-temperature transmission pipeline, vacuum is extracted from the low-temperature transmission pipeline, so that the heat conduction of gas in the pipeline interlayer is greatly reduced. Theory and experiment prove that the vacuum degree is better than 10 ^-3 Pa can greatly improve the cold insulation effect of the low-temperature transmission pipeline, and therefore, the sealing performance of the vacuum low-temperature transmission pipeline is required to be higher. In order to reduce the cold energy loss of the low-temperature working medium in the transmission process, the vacuum low-temperature transmission pipeline has high engineering application value in the low-temperature technical field.

Meanwhile, the manufacturing cost and difficulty of the low-temperature transmission pipeline are high due to the requirements of cold insulation and sealing. In order to ensure the vacuum degree of the interlayer, the outer pipelines of common low-temperature transmission pipelines are all welded and are independently matched in fixed using equipment. The operation such as disassembly, refitting, replacement and cleaning of the inner structure of the infusion tube is difficult to achieve for different structural sizes.

Disclosure of Invention

In view of this, it is necessary to provide a detachable cryogenic transfer line.

A cryogenic transfer line comprising an inner tube and an outer tube;

the inner pipe is arranged in the outer pipe;

the outer tube includes first body, second body and locates first body with the outer tube between the second body, the one end of outer tube pass through first flange subassembly with first body coupling, the other end of outer tube pass through second flange subassembly with second body coupling, the middle part of outer tube is equipped with the bellows, the outer tube for first body with the second body is portable.

In one embodiment, the first flange assembly comprises a first male flange and a first female flange, the second flange assembly comprises a second male flange and a second female flange, one end of the outer sleeve is sleeved on the outer side of the first pipe body, the first male flange is welded on one end of the outer sleeve, the first female flange is arranged in a cavity formed by the first male flange, the inner wall of the outer sleeve and the outer wall of the first pipe body, the second male flange is welded on the other end of the outer sleeve, and the second female flange is arranged on one side, away from the outer sleeve, of the second male flange.

In one embodiment, a first sealing gasket is disposed between the first female flange and the first male flange, and a second sealing gasket is disposed between the second female flange and the second male flange.

In one embodiment, the first male flange is provided with a through hole, the first female flange is provided with a blind hole, the first male flange and the first female flange are connected through a bolt, and one end of the bolt penetrates through the through hole and is arranged in the blind hole.

In one embodiment, the first flange assembly and the second flange assembly are raised face flanges, concave-convex face flanges, or tongue-and-groove face flanges.

In one embodiment, the inner tube comprises a first inner tube body, a second inner tube body and a third inner tube body, the second inner tube body is arranged between the first inner tube body and the third inner tube body, one end of the second inner tube body is connected with the first inner tube body through a third flange assembly, and the other end of the second inner tube body is connected with the third inner tube body through a fourth flange assembly.

In one embodiment, the outside of the inner tube is provided with a heat insulating layer.

In one embodiment, the inner tube includes at least two channels.

In one embodiment, an annular tube is also provided between the inner tube and the outer tube.

In one embodiment, the outside of the annular tube is provided with a heat insulating layer.

The low-temperature transmission pipeline combines the sealing, cold insulation and detachable performances of the vacuum low-temperature transmission pipeline. The improved flange structure is adopted to simply and conveniently open the outer sleeve, the outer sleeve is fastened by the bolts, the problem of tightness caused by the detachable characteristic is solved, the corrugated pipe is arranged in the middle of the outer sleeve, the pretightening force of the bolt connecting flange can be compensated, the required size error during installation and detachment can be simply and conveniently regulated, a certain regulating allowance is ensured, the stability and reliability of flange connection sealing are further ensured, a new device and structure are provided for further use and installation of the low-temperature transmission pipeline, and the practical engineering application value is realized.

Drawings

FIG. 1 is a schematic diagram of the cryogenic transfer line of example 1;

FIG. 2 is a schematic diagram of the cryogenic transfer line of example 2;

FIG. 3 is a schematic diagram of the cryogenic transfer line of example 3;

FIG. 4 is a schematic diagram of the cryogenic transfer line of example 4;

FIG. 5 is a schematic A-A sectional view of the cryogenic transfer line of example 4;

FIG. 6 is a schematic diagram of the cryogenic transfer line of example 5;

FIG. 7 is a schematic view showing the structure of a section B-B of the cryogenic transfer line of example 5;

fig. 8 is a schematic diagram of the cryogenic transfer line of example 7.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1, an embodiment of a cryogenic transfer line 100 includes an inner tube 110 and an outer tube.

The inner tube 110 is disposed within the outer tube. The inner tube 110 is used to transport a cryogenic liquid or gas. The inner tube 110 has a seamless tube structure. To reduce leakage of heat, the wall thickness of the inner tube 110 should be as thin as possible, which may be between 0.5mm and 2mm.

The outer tube includes a first tube 122, a second tube 124, and an outer sleeve 126 disposed between the first tube 122 and the second tube 124. One end of the outer sleeve 126 is connected to the first pipe body through a first flange assembly, and the other end of the outer sleeve 126 is connected to the second pipe body 124 through a second flange assembly. The outer sleeve 126 is movable relative to the first and

second tubes

122, 124. And the outer sleeve 126 is removable with respect to the first and

second tubes

122, 124. Disassembly and sealing of the outer tube may be performed as the outer sleeve 126 moves axially along the first and

second tubes

122, 124. In the embodiment shown in FIG. 1, the outer sleeve 126 has a tube diameter greater than the tube diameters of the first tube 122 and the second tube 124.

The middle of the outer sleeve 126 is provided with a bellows 128. Bellows 128 is welded to the middle of outer sleeve 126. Bellows 128 is used to compensate for the preload in bolting the flange. The size error required during installation and disassembly can be adjusted simply and conveniently, a certain adjustment allowance is ensured, and the stability and reliability of flange connection sealing are further ensured. The material of the bellows 128 may be stainless steel or carbon steel. Different materials and waveform structures can be selected according to different pressure resistance, corrosion resistance, use temperature and the like.

Referring to fig. 1, the first flange assembly includes a first male flange 132 and a first female flange 134. The second flange assembly includes a second male flange 136 and a second female flange 138. One end of the outer sleeve 126 is sleeved outside the first pipe 122. The first male flange 132 is welded to one end of the outer sleeve 126. The first female flange 134 is disposed in a cavity formed by the first male flange 132, the inner wall of the outer sleeve 126, and the outer wall of the first tube 122. The second male flange 136 is welded to the other end of the outer sleeve 126, and the second female flange 138 is disposed on a side of the second male flange 136 away from the outer sleeve 126.

Referring to fig. 1, a first sealing gasket 133 is disposed between the first female flange 134 and the first male flange 132, and a second sealing gasket 137 is disposed between the second female flange 138 and the second male flange 136. The first sealing gasket 133 should be arranged between the outer sleeve 126 and the bolting ensuring the sealing performance requirements of the flange. When the outer sleeve 126 is axially moved to bring the second male flange 136 into position with the first female flange 134, the first sealing gasket 133 can be easily replaced and installed. The first and

second gaskets

133, 137 take the form of seals that mate with the first and second

female flanges

134, 132 and the second and

male flanges

138, 136. Further, the first sealing gasket 133 and the second sealing gasket 137 are O-rings, copper gaskets, polytetrafluoroethylene gaskets, graphite gaskets, or the like. According to the use working conditions, including the sealing performance requirement, temperature, pressure, sealing form and the like, gaskets with different materials and forms can be selected. Can ensure the vacuum leakage requirement required by the vacuum low-temperature transmission pipeline and has good tightness.

Further, the first male flange 132, the first female flange 134, the second male flange 136 and the second female flange 138 may be flanges with different sealing surface types according to different sealing performance requirements. The first flange component and the second flange component can adopt a convex surface flange, a concave-convex surface flange, a mortise surface flange and the like, and are selected according to occasions with different applicable pressures. The material of the first flange assembly and the second flange assembly may be stainless steel 304 or 316L.

Further, the first male flange 132 is provided with a through hole (not shown), and the first female flange 134 is provided with a blind hole (not shown). The first male flange 132 and the first female flange 134 are connected by bolts 135, and one end of the bolts 135 is disposed in the blind hole through the through hole. To ensure the sealing performance, the face of the first female flange 134 cannot be penetrated.

Further, the inner tube 110 may be a detachable inner tube. Such as the inner tube employed in the embodiment shown in fig. 2.

Further, the outside of the inner tube 110 may be provided with a heat insulating layer. The insulation layer may take different internal insulation forms and materials.

Further, the inner tube 110 may include at least two channels.

Further, an annular tube may be provided between the inner tube 110 and the outer tube. Further, the outer side of the annular tube can be further provided with a heat insulation layer.

Compared to the conventional cryogenic transfer line, the above cryogenic transfer line 100 is innovative in that: first, the detachable low-temperature transmission pipeline 100 with the outer sleeve 126 can realize the function of opening the vacuum interlayer outer pipe, and is suitable for various operations on the internal structure of the low-temperature transmission pipeline 100, including cleaning, installing and replacing a heat insulation mode, installing and replacing a conveying structure of the inner pipe 110, and installing and replacing measuring equipment of the inner pipe 110. Secondly, through set up bellows 128 in the outer tube middle part, can be used for compensating the pretightning force when bolted connection flange, can portably adjust the required size error when installation and dismantlement, guarantee certain regulation surplus, still further guarantee flange joint sealed stability and reliability. Thirdly, the detachable outer sleeve 126 is connected by adopting bolts with two groups of flange structures, and sealing gaskets are arranged on the flanges, so that the detachable outer sleeve has good sealing performance and ensures the cold insulation effect of the low-temperature transmission pipeline 100; various operations inside the low-temperature transmission pipeline 100 are simplified, the application range of the vacuum low-temperature transmission pipeline is enlarged, the replacement property and the service life of the vacuum low-temperature transmission pipeline 100 are improved, and the vacuum low-temperature transmission pipeline has practical engineering application value.

The following is a detailed description of embodiments.

Example 1

Fig. 1 is a schematic diagram of a detachable cryogenic transfer line 100 with an outer sleeve 126. The cryogenic transfer line 100 comprises: an inner tube 110, an outer tube, a first male flange 132, a first female flange 134, a second male flange 136, a second female flange 138, a first sealing gasket 133, and a second sealing gasket 137. The outer tube includes a first tube 122, a second tube 124, and an outer sleeve 126 disposed between the first tube 122 and the second tube 124. The middle of the outer sleeve 126 is provided with a bellows 128.

When the outer sleeve 126 needs to be opened, the bolts on the first male flange 132, the first female flange 134, the second male flange 136 and the second female flange 138 are disassembled respectively, and nitrogen is introduced into the interlayer of the inner tube 110 and the outer tube before disassembly, so that the pressure in the interlayer is ensured to be recovered to normal pressure. After the disassembly, the outer sleeve 126 is pulled to move axially to the left along the outer sleeve until the internal structure is completely developed, and various operations including cleaning, installation and replacement of the heat insulation means, installation and replacement of the conveying structure of the inner tube 110, and installation and replacement of the measuring device of the inner tube 110 can be performed to the inside.

When a vacuum sandwich seal between the inner tube 110 and the outer tube is desired, the outer sleeve 126 is moved axially until the second male flange 136 reaches the location of the first female flange 134, the first sealing gasket 133 is inspected and the second sealing gasket 137 is inspected on the second female flange 138. The outer sleeve 126 is then slowly pulled in a reverse direction axially to the left along the outer tube until the first male flange 132 and the first female flange 134, the second male flange 136 and the second female flange 138 are in close proximity, then the first flange assembly and the second flange assembly are tightened with bolts 135, and then helium mass spectrometer leak detection is performed.

Example 2

FIG. 2 is a schematic diagram of a detachable outer sleeve 226 of a cryogenic transfer line 200, in which the inner tube is detachable. Cryogenic transfer line 200 comprises: an inner tube, an outer tube, a first male flange 232, a first female flange 234, a second male flange 236, a second female flange 238, a first gasket seal 233, and a second gasket seal 237. The outer tube includes a first tube 222, a second tube 224, and an outer sleeve 226 disposed between the first tube 222 and the second tube 224. A bellows 228 is provided in the middle of the outer sleeve 226. Wherein, for making things convenient for the inner tube to dismantle and open, carry out inside operation to the inner tube, the inner tube is established to multistage formula, can dismantle and open. Specifically, the inner tube includes a first inner tube cylinder 212, a second inner tube cylinder 214, and a third inner tube cylinder 216. The second inner tube barrel 214 is disposed between the first inner tube barrel 212 and the third inner tube barrel 218. One end of the second inner tube cylinder 214 is connected to the first inner tube cylinder 212 through a third flange assembly, and the other end of the second inner tube cylinder 214 is connected to the third inner tube cylinder 216 through a fourth flange assembly. It can be seen that second inner tube barrel 214 is mounted and used in a similar manner to outer sleeve 226. Except that a bellows or rigid tube may be simply employed as the structure of the detachable second inner tube cylinder 214.

In this embodiment, when the vacuum interlayer between the inner tube and the outer tube loses the vacuum extreme condition, a lot of impurities and dust enter, the vacuum layer is destroyed, and the operations of cleaning, adding activated carbon gas adsorbent and the like can be further performed to the inside of the interlayer by detaching the first male flange 232 and the second male flange 236 and opening the outer sleeve 226 structure. The vacuum-lost interlayer is further repaired and reused simply, and the replacement of the adsorbent ensures the vacuum degree and further prolongs the service life and the service life of the vacuum interlayer. In this embodiment, the inner pipe and the outer pipe can be simultaneously disassembled and opened, and the cryogenic transmission pipeline 200 can be disassembled into a plurality of sections, so that the installation and transportation are greatly simplified, and the use efficiency is improved.

Example 3

Fig. 3 is a schematic diagram of a detachable outer jacket type cryogenic pipeline 300, in which an insulating layer 340 is provided on the inner pipe 310. Cryogenic transfer line 300 comprises: inner tube 310, outer tube, first male flange 332, first female flange 334, second male flange 336, second female flange 338, first sealing gasket 333, second sealing gasket 337, and insulation layer 340. The outer tube includes a first tube 322, a second tube 324, and an outer sleeve 326 disposed between the first tube 322 and the second tube 324. A bellows 328 is provided in the middle of the outer sleeve 326. The heat insulating layer 340 may employ a high vacuum multi-layered heat insulating material.

The present embodiment uses insulation 340 to insulate inner tube 310, and when different insulation requirements are met, cryogenic transfer line 300 requires different insulation and insulation materials. For different needs, insulation 340 often needs to be replaced and reinstalled, and the outer sleeve 326 can be used to simply open the outer tube to reveal insulation 340 for dressing replacement. The vacuum multilayer heat insulating material is formed by compounding glass fiber paper and an aluminized film.

The material of the heat insulating layer 340 is not limited to the vacuum multi-layer heat insulating material, but may be replaced with other forms or materials such as porous powder, radiation screen, glass beads, etc.

Example 4

The cryogenic transfer line 400 shown in fig. 4 comprises: an inner tube, an outer tube, a first male flange 432, a first female flange 434, a second male flange 436, a second female flange 438, a first sealing gasket 433, and a second sealing gasket 437. The outer tube includes a first tube 422, a second tube 424, and an outer sleeve 426 disposed between the first tube 422 and the second tube 424. A bellows 428 is provided in the middle of the outer sleeve 426. Referring to fig. 5, in the present embodiment, the inner tube is in the form of multiple channels, including a first channel 412 and a second channel 414.

In this embodiment, the first and

second channels

412, 414 of the multiple channels can be configured to deliver different fluid working fluids or different working fluids of the same type. When working with different service conditions, it is often necessary to change the size and configuration of the first and

second channels

412, 414. The first channel 412 and the second channel 414 may be modified and replaced with the removable outer sleeve 426 of the present invention. Further, one or even more channels can be arranged to transmit working medium under the condition that the diameter of the outer tube allows. The first channel 412 and the second channel 414 are secured using a support structure. Insulation layers, such as those shown in fig. 3, may be wrapped around the outer surfaces of the first and

second channels

412, 414.

Example 5

Referring to fig. 6 and 7, the cryogenic transfer line 500 includes an inner tube 510, an outer tube, a first male flange 532, a first female flange 534, a second male flange 536, a second female flange 538, a first sealing gasket 533, a second sealing gasket 537, and an annular tube 540. The outer tube includes a first tube 522, a second tube 524, and an outer sleeve 526 disposed between the first tube 522 and the second tube 524. The middle of the outer sleeve 526 is provided with a bellows 528.

In this embodiment, a coaxial low-temperature transmission pipeline is often adopted, and the inner tube in fig. 1 is replaced by the inner tube 510 and the annular tube 540 shown in fig. 6, so as to respectively transmit two different working media or different states of the same working medium. The working medium transmitted in the annular pipe 540 can cool the low-temperature working medium of the inner pipe 510, and isolate heat transfer of the external environment. Further, by adopting the detachable low-temperature transmission pipeline with the outer sleeve, the annular pipe 540 structure with a multi-layer form can be arranged under the condition that the diameter of the outer sleeve is allowed, so as to transmit various fluid working media.

Example 6

As shown in fig. 6, this embodiment is further defined on the basis of embodiment 5: the annular tube 540 can be used for conveying fluid working media, or can be made into a thin-wall radiation cold screen by adopting oxygen-free copper materials under the vacuumizing condition. After the annular pipe 540 is manufactured into an oxygen-free copper sheet, a heat insulation layer can be wrapped on the outer surface to insulate heat, so that a good cold insulation effect is achieved on the low-temperature working medium conveying of the inner pipe 510. The annular tube 540 may be made of other metal materials with low emissivity.

Example 7

Referring to fig. 8, the cryogenic transfer line 600 comprises an inner tube 610, an outer tube, a first male flange 632, a first female flange 634, a second male flange 636, a second female flange 638, a first gasket seal 633, a second gasket seal 637, a test element 650, and a lead interface 640. The outer tube includes a first tube 622, a second tube 624, and an outer sleeve 626 disposed between the first tube 622 and the second tube 624. A bellows 628 is provided in the middle of the outer sleeve 626.

In this embodiment, the test element 650 is installed or replaced by opening the outer tube through the removable outer tube 626; meanwhile, the leads of the test element 650 are led out of an external acquisition system through the lead interface 640, so that temperature, vibration, pressure and the like can be measured in the vacuum layer simply and conveniently.

Further, the test elements 650 may be arranged at different locations of the inner tube 610, the outer tube and the vacuum sandwich, and multiple test elements 650 can be arranged at different test points for measurement.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. A cryogenic transfer line comprising an inner tube and an outer tube;

the inner pipe is arranged in the outer pipe;

the outer tube comprises a first tube body, a second tube body and an outer tube arranged between the first tube body and the second tube body, one end of the outer tube is connected with the first tube body through a first flange assembly, the other end of the outer tube is connected with the second tube body through a second flange assembly, a corrugated tube is arranged in the middle of the outer tube, and the outer tube is movable relative to the first tube body and the second tube body;

the first flange component comprises a first male flange and a first female flange, the second flange component comprises a second male flange and a second female flange, one end of the outer sleeve is sleeved on the outer side of the first pipe body, the first male flange is welded on one end of the outer sleeve, the first female flange is arranged in a cavity formed by the first male flange, the inner wall of the outer sleeve and the outer wall of the first pipe body, the second male flange is welded on the other end of the outer sleeve, and the second female flange is arranged on one side, far away from the outer sleeve, of the second male flange;

the first male flange is provided with a through hole, the first female flange is provided with a blind hole, the first male flange is connected with the first female flange through a bolt, and one end of the bolt penetrates through the through hole and is arranged in the blind hole;

the second male flange and the second female flange are connected through bolts.

2. The cryogenic transfer line of claim 1, wherein a first gasket seal is disposed between the first female flange and the first male flange and a second gasket seal is disposed between the second female flange and the second male flange.

3. The cryogenic transfer line of claim 1, wherein the first flange assembly and the second flange assembly are raised face flanges, female face flanges, or tongue and groove face flanges.

4. The cryogenic transfer line of claim 1, wherein the inner tube comprises a first inner tube cylinder, a second inner tube cylinder and a third inner tube cylinder, the second inner tube cylinder is disposed between the first inner tube cylinder and the third inner tube cylinder, one end of the second inner tube cylinder is connected to the first inner tube cylinder through a third flange assembly, and the other end of the second inner tube cylinder is connected to the third inner tube cylinder through a fourth flange assembly.

5. The cryogenic transfer line of claim 1, wherein the outside of the inner tube is provided with a thermal insulation layer.

6. The cryogenic transfer line of claim 1, wherein the inner tube comprises at least two channels.

7. The cryogenic transfer line of claim 1, wherein an annular tube is further provided between the inner tube and the outer tube.

8. The cryogenic transfer line of claim 7 wherein the outside of the annular tube is provided with a thermal insulation.