CN116857450A - Vacuum sealing assembly, vacuum double-wall pipe and vacuum construction process of vacuum double-wall pipe - Google Patents

Vacuum sealing assembly, vacuum double-wall pipe and vacuum construction process of vacuum double-wall pipe Download PDF

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Publication number
CN116857450A
CN116857450A CN202310980714.2A CN202310980714A CN116857450A CN 116857450 A CN116857450 A CN 116857450A CN 202310980714 A CN202310980714 A CN 202310980714A CN 116857450 A CN116857450 A CN 116857450A
Authority
CN
China
Prior art keywords
vacuum
pipe
double
obtaining
valve seat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310980714.2A
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Chinese (zh)
Inventor
苏思良
罗敏
雒川
邹波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chengdu Craer Cryogenic Equipment Co ltd
Original Assignee
Chengdu Craer Cryogenic Equipment Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chengdu Craer Cryogenic Equipment Co ltd filed Critical Chengdu Craer Cryogenic Equipment Co ltd
Priority to CN202310980714.2A priority Critical patent/CN116857450A/en
Publication of CN116857450A publication Critical patent/CN116857450A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/02—Welded joints
    • F16L13/0218—Welded joints having an inner or outer ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/07—Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Insulation (AREA)

Abstract

The invention belongs to the technical field of vacuum double-wall pipes, and particularly relates to a vacuum sealing assembly, a vacuum double-wall pipe and a vacuum construction process of the vacuum double-wall pipe. The vacuum sealing assembly comprises a vacuum valve seat, a vacuum valve core is arranged in the vacuum valve seat, the lower end of the vacuum valve seat is opened, communication ports are formed in two sides of the vacuum valve seat, and a vacuum sealing ring is arranged between the upper section and the lower section of the vacuum valve seat and the vacuum valve core. The vacuum double-wall pipe comprises a plurality of sections of vacuum double-wall pipe sections, each vacuum double-wall pipe section comprises an inner pipe, an outer pipe with two closed ends is sleeved outside the inner pipe, a single-side sealed mounting pipe is sleeved on the outer pipe, a vacuum valve seat is arranged between the mounting pipe and the outer pipe, and a space between the mounting pipe and the outer pipe is communicated with a communication port; the inner pipes of the two adjacent sections of vacuum double-wall pipe sections are connected, a connecting pipe is connected between the mounting pipes of the two adjacent sections of vacuum double-wall pipes, and a vacuum obtaining port is arranged on the connecting pipe. The invention provides a vacuum sealing assembly for improving vacuum degree of a vacuum interlayer, a vacuum double-wall pipe and a vacuum construction process thereof.

Description

Vacuum sealing assembly, vacuum double-wall pipe and vacuum construction process of vacuum double-wall pipe
Technical Field
The invention belongs to the technical field of vacuum double-wall pipes, and particularly relates to a vacuum sealing assembly, a vacuum double-wall pipe and a vacuum construction process of the vacuum double-wall pipe.
Background
LNG belongs to clean and green energy, and more ships begin to adopt LNG as fuel under the large background of energy conservation and emission reduction. The filling of LNG fuelled vessels with fuel inevitably requires the use of corresponding piping as a carrier for the transfer. Most of the existing conveying pipelines are bare pipe heat preservation and vacuum double-wall pipes, wherein the vacuum double-wall pipes are basically manufactured on site and vacuumized, the vacuum degree is difficult to reach an ideal state, the long-term vacuum life is difficult to reach, and the heat leakage loss of LNG in the conveying process cannot be well reduced by the two conveying modes. Accordingly, if the vacuum double-wall tube can achieve the ideal vacuum degree and vacuum life, the problem of heat leakage of LNG will be solved, and the gasification loss during the fuel filling process will be minimized.
The traditional vacuum double-wall pipe is mostly manufactured and vacuumized on site or prefabricated vacuum pipe sections in factories, the pipe sections are spliced on site, the vacuum interlayer is easy to enter air and water in the splicing process, the target vacuum degree cannot be achieved when the follow-up site is vacuumized, and the vacuum service life cannot be guaranteed. At present, similar vacuum products in the market are mostly vacuumized on site, are limited to field equipment and construction conditions, and the vacuum degree of the vacuum double-wall pipe is difficult to reach an ideal state (mostly 0.5-5 Pa).
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a vacuum sealing assembly, a vacuum double-wall pipe and a vacuum construction process for improving the vacuum degree of a vacuum interlayer.
The technical scheme adopted by the invention is as follows:
the utility model provides a vacuum seal assembly, includes the vacuum disk seat, is provided with the vacuum case in the vacuum disk seat, the lower extreme opening of vacuum disk seat, and the vacuum disk seat both sides all are provided with the UNICOM mouth, are provided with the vacuum seal between the upper segment and the lower segment of vacuum disk seat and the vacuum case.
The vacuum valve seat is provided with the vacuum valve core, and the vacuum valve seat is provided with the vacuum valve core. When the vacuum valve core is lifted, the vacuum sealing ring at the lower section of the vacuum valve core moves to the upper side of the communication port, and at the moment, the lower end opening of the vacuum valve seat is communicated with the communication port. The vacuum sealing assembly can realize two sealing states, and can ensure that the vacuum degree of a vacuum interlayer of a vacuum double-wall pipe joint is not lost all the time when the vacuum sealing assembly is applied to the vacuum double-wall pipe.
As a preferable scheme of the invention, the vacuum valve seat is buckled with a vacuum protection cover, and the vacuum protection cover is connected with the vacuum valve core. The vacuum protection cover can protect the vacuum valve seat and the vacuum valve core, and impurities are prevented from entering. The vacuum valve seat supports the vacuum protection cover, and the vacuum protection cover supports the vacuum valve core, so that the vacuum valve core is prevented from being sucked to the lower part of the vacuum valve seat, and the position of the vacuum valve core is ensured to be accurate.
The vacuum double-wall pipe comprises a plurality of sections of vacuum double-wall pipe sections, wherein each vacuum double-wall pipe section comprises an inner pipe, an outer pipe with two closed ends is sleeved outside the inner pipe, a single-side sealed mounting pipe is sleeved on the outer pipe, a vacuum valve seat of a vacuum sealing assembly is arranged between the mounting pipe and the outer pipe, and a space between the mounting pipe and the outer pipe is communicated with a communication port; the inner pipes of the two adjacent sections of vacuum double-wall pipe sections are connected, a connecting pipe is connected between the mounting pipes of the two adjacent sections of vacuum double-wall pipes, and a vacuum obtaining port is arranged on the connecting pipe.
The vacuum double-arm pipe joint is prefabricated in a factory, the vacuum interlayer between the inner pipe and the outer pipe is vacuumized, the vacuum valve core of the vacuum sealing assembly is positioned at the pressing position, and the space between the mounting pipe and the outer pipe is isolated from the vacuum interlayer, so that the vacuum loss of the vacuum interlayer is avoided. When in field construction, the closed space between the two sections of vacuum double-wall pipe joints is vacuumized through the vacuum obtaining port, and then the vacuum valve core of the vacuum sealing assembly is lifted, so that the closed space between the two sections of vacuum double-wall pipe joints is communicated with the two sections of vacuum interlayers. In the construction process, the vacuum interlayer can not be charged all the time, so that vacuum loss is avoided. In the field, only the airtight space between the two sections of the vacuum double-wall pipe sections is required to be vacuumized, so that the difficulty of on-site vacuumization is reduced, and the vacuum degree of the vacuum double-wall pipe is further ensured.
According to the invention, the vacuum sealing assembly is arranged on the vacuum sealing pipe section, so that the influence of the prefabricated vacuum double-wall pipe section of the factory on the vacuum degree in the field construction process can be reduced to zero. The invention can ensure that the vacuum degree reaches or approaches the factory prefabrication level (about 5 multiplied by 10) infinitely after the whole vacuum double-wall pipe line is constructed -2 Pa)。
As a preferred embodiment of the present invention, a vacuum obtaining assembly is connected to the vacuum obtaining port.
As a preferable scheme of the invention, the vacuum obtaining assembly comprises a vacuum obtaining valve seat connected with the vacuum obtaining port, a vacuum obtaining valve core is arranged in the vacuum obtaining valve seat, and a vacuum obtaining sealing ring is arranged between the vacuum obtaining valve core and the vacuum obtaining valve seat. When the vacuum is pumped, a valve rod of the vacuum pumping device is connected with the vacuum obtaining valve core, the valve rod pulls the vacuum obtaining valve core, and the vacuum pumping device pumps the vacuum. After the vacuumizing is completed, the valve rod presses the vacuum obtaining valve core into the vacuum obtaining valve seat, so that the loss of vacuum degree is avoided.
As a preferable scheme of the invention, the vacuum obtaining valve seat is sleeved with the vacuum obtaining protective cover. The vacuum obtaining protective cover can protect the vacuum obtaining valve seat and the vacuum obtaining valve core and prevent impurities from entering. And when the vacuum double-wall pipe leaks, the high-pressure action can enable the vacuum obtaining valve core to be punched out, and the vacuum obtaining protective cover can block the vacuum obtaining valve core, so that safety is ensured. The vacuum obtaining protective cover is in threaded connection with the vacuum obtaining valve seat, and a plurality of small holes are formed in the vacuum obtaining protective cover.
As a preferable scheme of the invention, a horn mouth is arranged on the inner side of the upper end of the vacuum obtaining valve seat, and a limiting ring matched with the horn mouth is arranged on the upper end of the vacuum obtaining valve core. The horn mouth can block the limiting ring, so that the valve core obtained in vacuum under the action of vacuum negative pressure is prevented from being sucked into the connecting pipe.
As a preferable mode of the invention, the inner tube is provided with an expansion joint. The expansion joints are arranged in a determined direction, and each section of vacuum double-wall pipe joint is connected with one expansion joint.
As a preferable scheme of the invention, a supporting plate is connected between the inner tube and the outer tube, and a communication hole is arranged on the supporting plate. The backup pad can support the outer tube, increases the intensity of outer tube.
A vacuum construction process of a vacuum double-wall pipe comprises the following steps:
butt welding the inner pipes of the two adjacent sections of vacuum double-arm pipe joints;
welding a connecting pipe between the mounting pipes of two adjacent sections of vacuum double-wall pipes;
vacuum is pumped to the airtight space between the two vacuum double-wall pipe joints by utilizing the vacuum obtaining port, and the vacuum degree is less than or equal to 5 multiplied by 10 -2 Pa is regarded as being qualified;
and lifting the vacuum valve cores of the vacuum sealing assemblies at two sides of the connecting pipe upwards once, and communicating the vacuum interlayer between the inner pipe and the outer pipe and the space between the outer pipe and the mounting pipe after lifting.
The beneficial effects of the invention are as follows:
the vacuum double-arm pipe joint is prefabricated in a factory, the vacuum interlayer between the inner pipe and the outer pipe is vacuumized, the vacuum valve core of the vacuum sealing assembly is positioned at the pressing position, and the space between the mounting pipe and the outer pipe is isolated from the vacuum interlayer, so that the vacuum loss of the vacuum interlayer is avoided. When in field construction, the closed space between the two sections of vacuum double-wall pipe joints is vacuumized through the vacuum obtaining port, and then the vacuum valve core of the vacuum sealing assembly is lifted, so that the closed space between the two sections of vacuum double-wall pipe joints is communicated with the two sections of vacuum interlayers. In the construction process, the vacuum interlayer can not be charged all the time, so that vacuum loss is avoided. In the field, only the airtight space between the two sections of the vacuum double-wall pipe sections is required to be vacuumized, so that the difficulty of on-site vacuumization is reduced, and the vacuum degree of the vacuum double-wall pipe is further ensured.
Drawings
FIG. 1 is a schematic view of a vacuum double-walled tube;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a cross-sectional view of a vacuum double-walled tube;
FIG. 4 is a partial enlarged view at B in FIG. 3;
FIG. 5 is a partial block diagram of a vacuum double wall tube;
FIG. 6 is a cross-sectional view of the vacuum seal assembly;
fig. 7 is a cross-sectional view of the vacuum acquisition assembly.
In the figure: 1-a vacuum seal assembly; 2-vacuum double-wall pipe sections; 3-connecting pipes; 4-vacuum obtaining assembly; 11-vacuum valve seat; 12-a vacuum valve core; 13-a communication port; 14-vacuum sealing ring; 15-vacuum protection cover; 21-an inner tube; 22-an outer tube; 23-mounting a tube; 24-single sided; 25-pre-welding the pipe; 26-expansion joint; 27-a support plate; 31-vacuum take-up port; 41-vacuum obtaining a valve seat; 42-obtaining a valve core in vacuum; 43-vacuum obtaining a sealing ring; 44-vacuum obtaining a protective cover; 111-check rings; 411-flare; 421-limit ring.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
As shown in fig. 5, the vacuum sealing assembly 1 of the present embodiment includes a vacuum valve seat 11, a vacuum valve core 12 is disposed in the vacuum valve seat 11, a lower end of the vacuum valve seat 11 is opened, communication ports 13 are disposed on two sides of the vacuum valve seat 11, and a vacuum sealing ring 14 is disposed between an upper section and a lower section of the vacuum valve seat 11 and the vacuum valve core 12. The upper end of the vacuum valve seat 11 is connected with a vacuum protection cover 15. The connection of the protective cover is used.
The vacuum valve seat 11 is buckled with a vacuum protection cover 15, and the vacuum protection cover 15 is in threaded connection with the vacuum valve core 12. The vacuum protection cover 15 can protect the vacuum valve seat 11 and the vacuum valve core 12 from entering impurities. The vacuum valve seat 11 supports the vacuum protection cover 15, and the vacuum protection cover 15 supports the vacuum valve core 12, so that the vacuum valve core 12 is prevented from being sucked to the lower part of the vacuum valve seat 11, and the accurate position of the vacuum valve core 12 is ensured.
Two vacuum sealing rings 14 are arranged between the upper section and the lower section of the vacuum valve seat 11 and the vacuum valve core 12. When the vacuum valve core 12 is in the lifting position, the vacuum valve core 12 and the four vacuum sealing rings 14 are positioned on the upper side of the communication port 13. When the vacuum valve core 12 is in the pressing position, two vacuum sealing rings 14 at the lower section of the vacuum valve core 12 are positioned at the lower side of the communication port 13, and two vacuum sealing rings 14 at the upper section of the vacuum valve core 12 are positioned at the upper side of the communication port 13. The retainer ring 111 is arranged at the opening of the lower end of the vacuum valve seat 11, and the retainer ring 111 can block the vacuum valve core 12 to prevent the vacuum valve core 12 from falling out of the vacuum valve seat 11.
According to the invention, the vacuum sealing rings 14 are arranged between the upper section and the lower section of the vacuum valve seat 11 and the vacuum valve core 12, so that after the vacuum valve core 12 is pressed down, the vacuum sealing rings 14 at the lower section of the vacuum valve core 12 move to the lower side of the communication port 13, and at the moment, the vacuum valve seat 11 is positioned at two sides of the communication port 13 to be sealed. When the vacuum valve core 12 is lifted, the vacuum sealing ring 14 at the lower section of the vacuum valve core 12 moves to the upper side of the communication port 13, and at this time, the lower end opening of the vacuum valve seat 11 is communicated with the communication port 13. The vacuum sealing assembly 1 can realize two sealing states, and can ensure that the vacuum degree of the vacuum interlayer of the vacuum double-wall pipe joint 2 is not lost all the time when being applied to the vacuum double-wall pipe.
As shown in fig. 1 to 6, the vacuum double-wall pipe of the embodiment comprises a plurality of sections of vacuum double-wall pipe sections 2, wherein a vacuum sealing assembly 1 is arranged on each vacuum double-wall pipe section 2, each vacuum double-wall pipe section comprises an inner pipe 21, an outer pipe 22 with two closed ends is sleeved outside each inner pipe 21, a space between each inner pipe 21 and each outer pipe 22 is a vacuum interlayer, a single-side sealed mounting pipe 23 is sleeved on each outer pipe 22, a vacuum valve seat 11 of each vacuum sealing assembly 1 is arranged between each mounting pipe 23 and each outer pipe 22, and a space between each mounting pipe 23 and each outer pipe 22 is communicated with a communication port 13; the inner pipes 21 of the two adjacent sections of vacuum double-wall pipe sections 2 are connected, a connecting pipe 3 is connected between the mounting pipes 23 of the two adjacent sections of vacuum double-wall pipes, and a vacuum obtaining port 31 is arranged on the connecting pipe 3. Wherein the connecting pipe 3 is a hafr pipe.
The vacuum double-arm pipe joint is prefabricated in a factory, a vacuum interlayer between the inner pipe 21 and the outer pipe 22 is vacuumized, the vacuum valve core 12 of the vacuum sealing assembly 1 is positioned at a pressing-down position, and a space between the mounting pipe 23 and the outer pipe 22 is isolated from the vacuum interlayer, so that vacuum loss of the vacuum interlayer is avoided. When in field construction, the vacuum obtaining port 31 is used for vacuumizing the airtight space between the two sections of the vacuum double-wall pipe sections 2, and then the vacuum valve core 12 of the vacuum sealing assembly 1 is lifted, so that the airtight space between the two sections of the vacuum double-wall pipe sections 2 is communicated with the two sections of the vacuum interlayers. In the construction process, the vacuum interlayer can not be charged all the time, so that vacuum loss is avoided. In the field, only the airtight space between the two sections of the vacuum double-wall pipe sections 2 is required to be vacuumized, so that the difficulty of on-site vacuumization is reduced, and the vacuum degree of the vacuum double-wall pipe is further ensured.
According to the invention, the vacuum sealing assembly 1 is arranged on the vacuum sealing pipe section, so that the influence of the prefabricated vacuum double-wall pipe section of the factory on the vacuum degree in the field construction process can be reduced to zero. The invention can ensure that the vacuum degree reaches or approaches the factory prefabrication level (about 5 multiplied by 10) infinitely after the whole vacuum double-wall pipe line is constructed -2 Pa)。
It should be noted that the two ends of the outer tube 22 of the vacuum double-wall tube section 2 are provided with mounting tubes 23, so that the connecting tube 3 is connected between every two adjacent vacuum double-wall tube sections, and the sealed space between every two adjacent vacuum double-wall tube sections 2 can be vacuumized.
Wherein, a single face 24 is arranged between the end of the outer tube 22 and the inner tube 21. The single face 24 is used to seal the vacuum interlayer between the inner tube 21 and the outer tube 22, avoiding vacuum loss from the vacuum interlayer.
A pre-welded pipe 25 is connected between the outer pipe 22 and the end of the mounting pipe 23 far from the connecting pipe 3. The pre-welded pipe 25 is used for connecting the mounting pipe 23, and the space between the outer pipe 22 and the end of the pre-welded pipe 25 away from the connecting pipe 3 is closed
To facilitate the evacuation of the space between the two sections of vacuum double-walled tubing 2, a vacuum acquisition assembly 4 is connected to the vacuum acquisition port 31. The vacuum obtaining assembly 4 comprises a vacuum obtaining valve seat 41 connected with the vacuum obtaining port 31, a vacuum obtaining valve core 42 is arranged in the vacuum obtaining valve seat 41, and a vacuum obtaining sealing ring 43 is arranged between the vacuum obtaining valve core 42 and the vacuum obtaining valve seat 41. When the vacuum is pumped, a valve rod of the vacuum pumping device is in threaded connection with the vacuum obtaining valve core 42, the valve rod pulls up the vacuum obtaining valve core 42, and the vacuum pumping device pumps the vacuum. After the evacuation is completed, the valve rod presses the vacuum obtaining valve core 42 into the vacuum obtaining valve seat 41, so that the loss of vacuum degree is avoided.
The vacuum obtaining valve seat 41 is sleeved with a vacuum obtaining protective cover 44. The vacuum-obtaining protection cover 44 can protect the vacuum-obtaining valve seat 41 and the vacuum-obtaining valve spool 42 from the entry of impurities. And when the vacuum double-wall pipe leaks, the high pressure can enable the vacuum obtaining valve core 42 to be flushed out, and the vacuum obtaining protective cover 44 can block the vacuum obtaining valve core 42, so that safety is ensured. The vacuum obtaining protection cover 44 is screwed with the vacuum obtaining valve seat 41, and a plurality of small holes are arranged on the vacuum obtaining protection cover 44.
The inner side of the upper end of the vacuum obtaining valve seat 41 is provided with a flare 411, and the upper end of the vacuum obtaining valve core 42 is provided with a limiting ring 421 matched with the flare 411. The bell mouth 411 can block the limiting ring 421, so that the vacuum acquisition valve core 42 is prevented from being sucked into the connecting pipe 3 under the action of vacuum negative pressure.
The inner pipe 21 is provided with expansion joints 26, the expansion joints 26 are installed according to a determined direction, and each section of vacuum double-wall pipe joint 2 is connected with one expansion joint 26.
A supporting plate 27 is connected between the inner and outer tubes 22, and a communication hole is arranged on the supporting plate 27. The support plate 27 can support the outer tube 22, increasing the strength of the outer tube 22.
The vacuum construction process of the vacuum double-wall pipe of the embodiment comprises the following steps:
s1: butt welding the inner pipes 21 of two adjacent sections of vacuum double-arm pipe joints;
s2: welding a connecting pipe 3 between the mounting pipes 23 of two adjacent sections of vacuum double-wall pipes; wherein the connecting pipe 3 can be a hafr pipe;
s3: welding a vacuum obtaining assembly 4 on the connecting pipe 3;
s4: vacuumizing a closed space between the two vacuum double-wall pipe sections 2 by utilizing the vacuum obtaining assembly 4 in the step S3, wherein the vacuum degree is less than or equal to 5 multiplied by 10 < -2 > Pa, and the vacuum degree is regarded as qualified; when vacuumizing, a valve rod of the vacuumizing device is in threaded connection with the vacuum obtaining valve core 42, the valve rod pulls up the vacuum obtaining valve core 42, and the vacuumizing device vacuumizes; after the vacuumizing is completed, the valve rod presses the vacuum obtaining valve core 42 into the vacuum obtaining valve seat 41, so that the loss of vacuum degree is avoided;
s5: lifting the vacuum valve cores 12 of the vacuum sealing assemblies 1 on two sides of the connecting pipe 3 upwards once, and after lifting, communicating the vacuum interlayer between the inner pipe 21 and the outer pipe 22 and the space between the outer pipe 22 and the mounting pipe 23 according to the channels shown by arrows in fig. 5;
s6: repeating the steps S1 to S5, and sequentially communicating the whole project pipeline according to the steps.
In the invention, the unique structure of the vacuum sealing assembly 1 is assisted by a corresponding construction process, so that the vacuum zero loss of the vacuum double-wall pipe can be ensured in the field construction process, and the unique advantage of factory pre-manufacturing of the high-vacuum double-wall pipe is highlighted.
The invention is not limited to the above-described alternative embodiments, and any person who may derive other various forms of products in the light of the present invention, however, any changes in shape or structure thereof, all falling within the technical solutions defined in the scope of the claims of the present invention, fall within the scope of protection of the present invention.

Claims (10)

1. A vacuum seal assembly, characterized in that: including vacuum disk seat (11), be provided with vacuum case (12) in vacuum disk seat (11), the lower extreme opening of vacuum disk seat (11), vacuum disk seat (11) both sides all are provided with UNICOM mouth (13), are provided with vacuum sealing washer (14) between the upper segment and the hypomere of vacuum disk seat (11) and vacuum case (12).
2. A vacuum seal assembly as claimed in claim 1, wherein: the vacuum valve seat (11) is buckled with a vacuum protection cover (15), and the vacuum protection cover (15) is connected with the vacuum valve core (12).
3. A vacuum double-walled tube comprising the vacuum seal assembly of claim 1, wherein: the vacuum double-arm pipe joint further comprises a plurality of sections of vacuum double-wall pipe joints (2), each vacuum double-arm pipe joint comprises an inner pipe (21), an outer pipe (22) with two closed ends is sleeved outside the inner pipe (21), a single-side sealed mounting pipe (23) is sleeved on the outer pipe (22), a vacuum valve seat (11) of the vacuum sealing assembly (1) is mounted between the mounting pipe (23) and the outer pipe (22), and a space between the mounting pipe (23) and the outer pipe (22) is communicated with the communicating opening (13); the inner pipes (21) of the two adjacent sections of vacuum double-wall pipe sections (2) are connected, a connecting pipe (3) is connected between the mounting pipes (23) of the two adjacent sections of vacuum double-wall pipes, and a vacuum obtaining port (31) is arranged on the connecting pipe (3).
4. A vacuum double-walled pipe according to claim 3, wherein: the vacuum obtaining port (31) is connected with a vacuum obtaining assembly (4).
5. A vacuum double-walled pipe according to claim 4 wherein: the vacuum obtaining assembly (4) comprises a vacuum obtaining valve seat (41) connected with the vacuum obtaining port (31), a vacuum obtaining valve core (42) is arranged in the vacuum obtaining valve seat (41), and a vacuum obtaining sealing ring (43) is arranged between the vacuum obtaining valve core (42) and the vacuum obtaining valve seat (41).
6. A vacuum double-walled pipe according to claim 5 wherein: the vacuum obtaining valve seat (41) is sleeved with a vacuum obtaining protective cover (44).
7. A vacuum double-walled pipe according to claim 5 wherein: the inner side of the upper end of the vacuum obtaining valve seat (41) is provided with a bell mouth (411), and the upper end of the vacuum obtaining valve core (42) is provided with a limiting ring (421) matched with the bell mouth (411).
8. A vacuum double-walled pipe according to claim 3, wherein: an expansion joint (26) is arranged on the inner tube (21).
9. A vacuum double-walled pipe according to claim 3, wherein: a supporting plate (27) is connected between the inner tube (22) and the outer tube (22), and a communication hole is arranged on the supporting plate (27).
10. A vacuum construction process for a vacuum double-wall pipe, using the vacuum double-wall pipe according to any one of claims 3 to 9, characterized in that: the method comprises the following steps:
butt welding inner pipes (21) of two adjacent sections of vacuum double-arm pipe joints;
a connecting pipe (3) is welded between the mounting pipes (23) of two adjacent sections of vacuum double-wall pipes;
vacuum is pumped to a closed space between two vacuum double-wall pipe joints (2) by utilizing a vacuum obtaining port (31), and the vacuum degree is less than or equal to 5 multiplied by 10 - 2 Pa is regarded as being qualified;
and lifting the vacuum valve cores (12) of the vacuum sealing assemblies (1) at two sides of the connecting pipe (3) at one time, and communicating the space between the vacuum interlayer between the inner pipe (21) and the outer pipe (22) and the space between the outer pipe (22) and the mounting pipe (23) after lifting.
CN202310980714.2A 2023-08-04 2023-08-04 Vacuum sealing assembly, vacuum double-wall pipe and vacuum construction process of vacuum double-wall pipe Pending CN116857450A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310980714.2A CN116857450A (en) 2023-08-04 2023-08-04 Vacuum sealing assembly, vacuum double-wall pipe and vacuum construction process of vacuum double-wall pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310980714.2A CN116857450A (en) 2023-08-04 2023-08-04 Vacuum sealing assembly, vacuum double-wall pipe and vacuum construction process of vacuum double-wall pipe

Publications (1)

Publication Number Publication Date
CN116857450A true CN116857450A (en) 2023-10-10

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ID=88230672

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310980714.2A Pending CN116857450A (en) 2023-08-04 2023-08-04 Vacuum sealing assembly, vacuum double-wall pipe and vacuum construction process of vacuum double-wall pipe

Country Status (1)

Country Link
CN (1) CN116857450A (en)

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