CN112128494B - Flange joint for vacuum interlayer pipeline and vacuum interlayer pipeline assembly - Google Patents

Flange joint for vacuum interlayer pipeline and vacuum interlayer pipeline assembly Download PDF

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Publication number
CN112128494B
CN112128494B CN202010857389.7A CN202010857389A CN112128494B CN 112128494 B CN112128494 B CN 112128494B CN 202010857389 A CN202010857389 A CN 202010857389A CN 112128494 B CN112128494 B CN 112128494B
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China
Prior art keywords
flange
sealing
outer cylinder
annular
vacuum
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CN202010857389.7A
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Chinese (zh)
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CN112128494A (en
Inventor
王敬哲
王健
崔腾飞
程子云
李强
冯慧华
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Shanghai MicroPowers Co Ltd
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Shanghai MicroPowers Co Ltd
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Priority to CN202010857389.7A priority Critical patent/CN112128494B/en
Publication of CN112128494A publication Critical patent/CN112128494A/en
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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
    • F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
    • F16L39/02—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies for hoses
    • 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
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose-connectors, i.e. single members engaging both hoses
    • F16L33/18—Arrangements for connecting hoses to rigid members; Rigid hose-connectors, i.e. single members engaging both hoses characterised by the use of additional sealing means
    • 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
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose-connectors, i.e. single members engaging both hoses
    • F16L33/28—Arrangements for connecting hoses to rigid members; Rigid hose-connectors, i.e. single members engaging both hoses for hoses with one end terminating in a radial flange or collar
    • 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
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/065—Arrangements using an air layer or vacuum using vacuum
    • 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
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
    • F16L59/18—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for joints
    • F16L59/184—Flanged joints

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Flanged Joints, Insulating Joints, And Other Joints (AREA)

Abstract

The invention discloses a flange joint for a vacuum interlayer pipeline and a vacuum interlayer pipeline assembly, which comprises the following components: the first flange comprises a first inner cylinder and a first outer cylinder which are arranged at intervals, the second flange comprises a second inner cylinder and a second outer cylinder which are arranged at intervals, and the first inner cylinder is connected with the second inner cylinder in a sealing way; the outer peripheral surface of the first sealing end is in sealing connection with the inner peripheral surface of the second sealing end; in this patent, flange joint whole radial dimension is little, is applicable to the vacuum hose that can coil, and the equipment of being convenient for.

Description

Flange joint for vacuum interlayer pipeline and vacuum interlayer pipeline assembly
Technical Field
The invention relates to the field of vacuum interlayer pipelines and sealing connection structures, in particular to a flange joint for a vacuum interlayer pipeline and a vacuum interlayer pipeline assembly.
Background
The vacuum interlayer pipeline is provided with an inner pipe and an outer pipe, the outer pipe is sleeved outside the inner pipe, the inner pipe is used for transporting fluid, the space between the outer pipe and the inner pipe is vacuumized, the vacuum interlayer has good heat preservation performance, and the fluid in the inner pipe can be effectively preserved. The construction site of the vacuum interlayer pipeline often does not have a vacuumizing condition, so that the connection of the vacuum interlayer pipeline is realized by adopting flanges which are respectively connected with the inner pipe and the outer pipe in a sealing way in the prior art, but the flange joint in the prior art has poor heat insulation performance and larger volume, often protrudes out of the surface of the pipeline, and when the pipeline is coiled up, the protruding flange joint can possibly cause the surface of the pipeline to be scratched. Therefore, whether a flange joint with good heat insulation performance, small volume and radial dimension close to the radial dimension of a pipeline exists is a technical problem expected to be solved by a person skilled in the art.
Disclosure of Invention
The invention aims to provide a flange joint for a vacuum interlayer pipeline and a vacuum interlayer pipeline assembly, wherein the flange joint is small in size, has a radial dimension close to that of the vacuum interlayer pipeline and is suitable for a hose needing to be coiled.
The technical scheme provided by the invention is as follows:
flange joint for vacuum intermediate layer pipeline, with vacuum intermediate layer pipeline sealing connection, vacuum intermediate layer pipeline includes inner tube and outer tube, the inner tube with be the vacuum chamber between the outer tube, include:
the first flange comprises a first inner cylinder and a first outer cylinder which are arranged at intervals, and one end, far away from the second flange, of the first inner cylinder is connected with one end of the first outer cylinder in a sealing way; the second flange comprises a second inner cylinder and a second outer cylinder which are arranged at intervals, and one end, far away from the first flange, of the second inner cylinder is connected with one end of the second outer cylinder in a sealing way; the first inner cylinder is connected with the second inner cylinder in a sealing way; the end, close to the second flange, of the first outer cylinder is a first sealing end, the end, close to the first flange, of the second outer cylinder is a second sealing end, the radial size of the first sealing end is smaller than that of the second sealing end, and the outer peripheral surface of the first sealing end is in sealing connection with the inner peripheral surface of the second sealing end;
the outer peripheral surface of the first outer cylinder is provided with a first flange and a second flange, the outer peripheral surface of the second outer cylinder is provided with a third flange and a fourth flange, the first flange, the second flange, the third flange and the fourth flange are sequentially arranged, the second flange and the third flange are fixed, the first flange and the second flange are fastened in the extending direction of the vacuum interlayer pipeline, the first flange and the fourth flange are respectively connected with the outer pipe in a sealing mode, and the inner walls of the first inner cylinder and the second inner cylinder are respectively connected with the inner pipe in a sealing mode.
When the first flange and the second flange are fastened, the first outer cylinder and the second outer cylinder are sealed with each other, and the first inner cylinder and the second inner cylinder are sealed with each other to form a sealing cavity. The two sides of the sealing position of the first inner cylinder and the second inner cylinder are respectively provided with an inner pipe and a sealing cavity, and the two sides of the sealing position of the first outer cylinder and the second outer cylinder are respectively provided with a sealing cavity and an external environment. If the fluid leaks at the flange, the fluid leaks into the sealing cavity first and then leaks to the outside of the environment through the sealing cavity, so that the fluid inside the inner tube can leak into the environment only when the two seals between the first inner tube and the second inner tube and between the first outer tube and the second outer tube are invalid. When the inner cylinder is used for transporting cold medium, the gas in the sealing cavity can be gradually cooled, the air pressure is reduced, low-temperature vacuum is formed, when fluid leaks into the sealing cavity, the fluid can be rapidly vaporized to form air resistance in the low-pressure environment, and further leakage of the fluid can be prevented.
The first outer cylinder and the second outer cylinder are sealed in the radial direction, so that the radial dimension of the first outer cylinder and the second outer cylinder is reduced, further, the outer tube of the vacuum interlayer pipeline is fixed with the first flange and the fourth flange which extend outwards of the first outer cylinder and the second outer cylinder, the main bodies of the first outer cylinder and the second outer cylinder are embedded between the outer tube and the inner tube of the vacuum interlayer pipeline, when the radial dimension of the first flange, the second flange, the third flange and the fourth flange is relatively close, the radial dimension of the first flange and the radial dimension of the second flange are basically the same as that of the vacuum interlayer pipeline, the vacuum interlayer pipeline is suitable for vacuum hoses needing to be coiled, and the problem that in the prior art, the flange joint is relatively large in radial dimension and easy to scratch or extrude other parts of the hose to cause pipe body damage is avoided.
The first inner cylinder and the first outer cylinder form a U-shaped heat bridge, the second inner cylinder and the second outer cylinder form a U-shaped cold bridge, the heat conduction path is prolonged, and the heat preservation of the inner tube is facilitated.
Further preferably, the second flange and the third flange are fixed by a stud.
The first flange and the third flange are fixed by the stud, the distance between the first flange and the second flange in the axial direction and the distance between the third flange and the fourth flange in the axial direction are more than or equal to the axial dimension of the nut, and the dimension of the flange joint in the axial direction is reduced.
Further preferably, the first inner cylinder has an annular tenon toward the second flange, the second inner cylinder has a corresponding first annular groove, an annular gasket is disposed in the first annular groove, and the annular tenon and the first annular groove are sealed by the annular gasket.
The annular gasket can adopt various materials of metal or rubber, and the both sides of first inner tube and second inner tube are sealed chamber and inside the inner tube respectively, and annular gasket's sealed effect to a great extent has decided the holistic sealed effect of flange joint. The second flange and the third flange are fastened by studs in the axial direction, which press the first flange and the second flange in the axial direction. The direction of the tenon protrusion faces the second flange, namely the direction is the same as the axial direction, so that the pressure between the first flange and the second flange can directly act between the tenon protrusion and the first annular groove, and the sealing effect of the first inner cylinder and the second inner cylinder is ensured.
Further preferably, the outer circumferential surface of the first sealing end is provided with a second annular groove, an annular sealing ring is arranged in the second annular groove, and the first sealing end and the second sealing end are in sealing connection through the annular sealing ring.
The first sealing end and the second sealing end are sealed in the circumferential direction through the sealing ring, so long as the sealing ring is simultaneously in sealing connection with the inner circumferential surface of the second sealing end and the second annular groove, the sealing of the first sealing end and the second sealing end can be realized, and the thickness of the second sealing end can be set to be thinner so as to reduce the radial dimension of the second flange. Meanwhile, certain dislocation can be generated between the first sealing end and the second sealing end in the axial direction, and when a new annular gasket is replaced, the small change of the thickness of the annular gasket can not affect the sealing effect of the joint.
Further preferably, the second flange is sleeved on the first outer cylinder and can slide along the extending direction of the first outer cylinder; the first outer cylinder is provided with a third annular groove, a check ring is arranged in the third annular groove, and the check ring is used for limiting the second flange in the extending direction of the first outer cylinder;
and/or the third flange is sleeved on the second outer cylinder and can slide along the extending direction of the second outer cylinder; the second outer cylinder is provided with a third annular groove, a check ring is arranged in the third annular groove, and the check ring is used for limiting the third flange in the extending direction of the second outer cylinder.
The pre-tightening mode of the stud can affect the sealing effect of the gasket. After the first flange and the fourth flange are arranged, the stud connecting the second flange and the third flange is embedded between the first flange and the fourth flange, the stud can only be operated from the side, and a plurality of studs are difficult to operate simultaneously. The second flange is arranged in a loop mode, the first flange and the second flange can be abutted together at a proper angle and under proper pressure, and then the double-end stud is screwed, so that the annular gasket is uniformly stressed in the whole process, and the annular gasket is beneficial to playing a reliable sealing effect. In a specific connection scenario, a user needs to connect the first flange and the second flange with two sections of vacuum interlayer pipes respectively, and then fix the first flange and the second flange. If the screw hole positions on the second flange and the third flange are not matched in the process, the second flange can be rotated only to align the third flange, the whole first flange and the vacuum interlayer pipeline do not need to be rotated, the shape of the vacuum interlayer pipeline cannot be influenced, and the vacuum interlayer pipeline structure is suitable for the vacuum interlayer pipeline which is inconvenient to rotate, such as long in length or large in radial size, heavy in weight and the like.
Accordingly, only the third flange may be provided in a loop form, or both the second flange and the third flange may be provided in a loop form, and the adjusted solutions are all within the scope of protection of the present patent.
Further preferably, one end of the first outer barrel far away from the second flange is provided with a first annular folded edge which extends inwards along the radial direction, and the first annular folded edge is fixed with the first inner barrel in a sealing way;
one end of the second outer cylinder, which is far away from the second flange, is provided with a second annular folded edge which extends inwards along the radial direction, and the second annular folded edge is fixed with the first inner cylinder in a sealing way;
annular stress relief grooves are respectively formed in one sides, away from the first annular folded edges and the second annular folded edges, of the first annular folded edges.
The stress release groove can generate certain deformation when the fastening force of the flange is large so as to disperse the stress of all parts around the sealing connection of the inner cylinder and the outer cylinder and ensure that the inner cylinder and the outer cylinder are not damaged.
Further preferably, the first annular groove comprises a first section and a second section which are connected, the first section is close to the first flange, the groove width of the first section is larger than that of the second section, and the first section guides the annular tenon into the second section so as to facilitate connection of flange joints.
It is a further object of the present invention to provide a vacuum sandwich piping assembly comprising connected vacuum sandwich piping and a flange joint for vacuum sandwich piping having the aforementioned features.
This creatively sets up vacuum intermediate layer pipeline flange joint to, the outer peripheral face of first sealed end passes through sealing washer and the inner peripheral face sealing connection of second sealed end, and first urceolus is provided with first flange and second flange, the second urceolus is provided with third flange and fourth flange, first flange and fourth flange are connected with the outer tube, third flange and fourth flange are used for fastening flange joint, make flange joint whole radial dimension little, be applicable to the vacuum hose that can coil, among the prior art, the too big flange joint of radial dimension probably causes the damage of hose when the vacuum hose coils, under the guide of first sealed end and second sealed end, be convenient for realize the pretension to annular gasket, the equipment of being convenient for, sealed effectual.
Drawings
The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is an overall cross-sectional view of a flange according to one embodiment of the present invention;
FIG. 2 is an enlarged view of FIG. 1A;
FIG. 3 is an enlarged view of FIG. 1B;
fig. 4 is a schematic view of a first annular groove structure according to an embodiment of the present invention.
Reference numerals illustrate:
100-vacuum sandwich tubing; 110-an inner tube; 120-an outer tube; 200-a first flange; 210-a first inner barrel; 211-annular tenon; 220-a first outer barrel; 221-a third annular groove; 222-a first annular flap; 223-stress relief groove; 224-a second annular groove; 230-a first sealed end; 240-a first flange; 250-a second flange; 300-a second flange; 310-a second inner barrel; 311-a first annular groove; 312-first section; 313-second stage; 320-a second outer cylinder; 321-second annular hems; 330-a second sealed end; 340-a third flange; 350-a fourth flange; 400-annular gasket; 500-sealing rings; 600-check ring.
Detailed Description
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
As a specific embodiment, as shown in fig. 1, a flange joint for a vacuum interlayer pipe is connected with a vacuum interlayer pipe 100 in a sealing manner, the vacuum interlayer pipe 100 comprises an inner pipe 110 and an outer pipe 120, a vacuum cavity is arranged between the inner pipe 110 and the outer pipe 120, and a fluid transportation path is arranged inside the inner pipe 110. The flange joint structure comprises a first flange 200 and a second flange 300, wherein the first flange 200 and the second flange 300 are arranged along the axial direction of the vacuum interlayer pipeline 100, the first flange 200 comprises a first inner cylinder 210 and a first outer cylinder 220 which are arranged at intervals, and one ends of the first inner cylinder 210 and the first outer cylinder 220, which are far away from the second flange 300, are connected in a sealing way; the second flange 300 includes a second inner cylinder 310 and a second outer cylinder 320 disposed at a distance, and one ends of the second inner cylinder 310 and the second outer cylinder 320 remote from the first flange 200 are hermetically connected. The first inner cylinder 210 is in sealing connection with the second inner cylinder 310, one end of the first outer cylinder 220, which is close to the second outer cylinder 320, is provided with a first sealing end 230, one end of the second outer cylinder 320, which is close to the first outer cylinder 220, is provided with a second sealing end 330, the radial dimension of the first sealing end 230 is smaller than that of the second sealing end 330, the outer circumferential surface of the first sealing end 230 is in sealing connection with the inner circumferential surface of the second sealing end 330, and the inner surfaces of the first inner cylinder 210 and the second inner cylinder 310 are respectively fixed with the inner tube 110. The first outer tube 220 has a first flange 240 and a second flange 250 at the outside thereof, the second outer tube 320 has a third flange 340 and a fourth flange 350 at the outside thereof, the first flange 240, the second flange 250, the third flange 340 and the fourth flange 350 are sequentially arranged in the axial direction of the vacuum sandwich tube 100, the outer tube 120 is fixed to the first flange 240 and the fourth flange 350, and the second flange 250 and the third flange 340 are fixed by studs to fasten the first flange 200 and the second flange 300.
Because the outer tube 120 is fixed to the first flange 240 and the fourth flange 350, the radial dimension of the flange joint is close to the radial dimension of the vacuum sandwich pipe 100, and the situation that the flange joint extrudes the pipe to deform or damage the vacuum failure when the vacuum sandwich pipe 100 is coiled due to the overlarge radial dimension of the flange joint can be avoided. However, when the dimensions of the first flange 240, the second flange 250, the third flange 340, and the fourth flange 350 are relatively close, the studs connecting the second flange 250 and the third flange 340 are located between the first flange 240 and the fourth flange 350. When the distance between the first flange 240 and the second flange 250 and the distance between the third flange 340 and the fourth flange 350 are short, the user cannot operate the stud from both ends in the axial direction of the stud, and can operate the stud only from the outer circumferential surface of the flange joint, which is relatively inconvenient. At this time, the first flange 200 and the second flange 300 may be first approached to each other, so that the first sealing end 230 enters the second sealing end 330, and then the studs are sequentially rotated, the first sealing end 230 is fed inwards under the guidance of the second sealing end 330, so that the contact ends of the first inner cylinder 210 and the second inner cylinder 310 may be contacted in parallel, and the leakage caused by deformation of the contact ends of the first inner cylinder 210 or the second inner cylinder 310 in the process of rotating the studs is avoided, and the size of the flange joint in the whole axial direction is reduced. By this point, those skilled in the art will appreciate that the structural arrangement of the first flange 240, the second flange 250, the third flange 340 and the fourth flange 350, and the manner in which the first sealing end 230 and the second sealing end 330 are sealed, are indeed the key invention points of this patent. In actual production, the inner tube 110 and the outer tube 120 and the flange joint can be fixed by welding, the radial dimensions of the first flange 240, the second flange 250, the third flange 340 and the fourth flange 350 can be set to be the same or different, the lengths of the first sealing end 230 and the second sealing end 330 can be adjusted according to specific needs, and the above schemes are all within the protection scope of the present patent.
When the first flange 200 and the second flange 300 are fastened, the first outer cylinder 220 and the second outer cylinder 320 are sealed to each other, and the first inner cylinder 210 and the second inner cylinder 310 are sealed to each other to form a sealed cavity. The sealing portion of the first inner cylinder 210 and the second inner cylinder 310 has an inner tube interior and a sealing chamber on both sides, and the sealing portion of the first outer cylinder 220 and the second outer cylinder 320 has a sealing chamber and an external environment on both sides. When the fluid leaks at the flange, it leaks into the sealing chamber first and then leaks to the outside of the environment through the sealing chamber, so that the fluid inside the inner tube 110 leaks to the environment only when both seals between the first inner tube 210 and the second inner tube 310 and between the first outer tube 220 and the second outer tube 320 fail. When the inner cylinder is used for transporting cold medium, the gas in the sealing cavity can be gradually cooled, the air pressure is reduced, low-temperature vacuum is formed, when fluid leaks into the sealing cavity, the fluid can be rapidly vaporized to form air resistance in the low-pressure environment, and further leakage of the fluid can be prevented. The first outer cylinder 220 and the second outer cylinder 320 are sealed in the radial direction thereof, which is advantageous in reducing the radial dimensions of the first outer cylinder 220 and the second outer cylinder 320. The first inner cylinder 210 and the first outer cylinder 220 form a U-shaped heat bridge, and the second inner cylinder 310 and the second outer cylinder 320 form a U-shaped heat bridge, so that a heat conduction path is prolonged, and heat preservation of the inner tube 110 is facilitated.
In a preferred embodiment, as shown in fig. 3, the first inner cylinder 210 has an annular tongue 211 facing the direction of the second flange 300, the second inner cylinder 310 has a corresponding first annular groove 311, an annular gasket 400 is disposed in the first annular groove 311, and the annular tongue 211 and the first annular groove 311 are sealed by the annular gasket 400. The annular gasket 400 is located in a radial plane of the vacuum sandwich pipe 100, one end of the annular gasket 400 abuts against the annular tenon 211, and the other end abuts against the bottom of the first annular groove 311. The studs are used for fastening the second flange 250 and the third flange 340, and the fastening force is oriented perpendicular to the plane of the annular gasket 400, so that the pressure between the first flange 200 and the second flange 300 is mainly applied to the annular gasket 400 through the annular tenon 211 and the bottom of the first annular groove 311, the sealing reliability of the annular gasket 400 is improved, and the annular gasket 400 can be made of various materials such as metal or rubber.
The outer circumferential surface of the first sealing end 230 is provided with a second annular groove 224, an annular sealing ring 500 is arranged in the second annular groove 224, and the first sealing end 230 and the second sealing end 330 are in sealing connection through the annular sealing ring 500. The inside and outside of the first sealing end 230 and the second sealing end 330 are respectively a sealing cavity and an external atmosphere environment, the sealing performance requirement is relatively low, so long as the sealing ring 500 is in sealing connection with the inner peripheral surface of the second sealing end 330 and the second annular groove 224, the sealing of the first sealing end 230 and the second sealing end 330 can be realized, the thickness of the second sealing end 330 can be set to be thinner, the structure is simple, the whole size of the flange joint is convenient to reduce, and the flange joint is suitable for a pipe body with smaller size. Compared with the first sealing end 230 and the second sealing end 330 which are sealed by the sealing surfaces positioned in the radial plane of the vacuum interlayer pipeline 100, the sealing mode reduces the stress of the first sealing end 230 and the second sealing end 330 in the axial direction, so that the stress between the first inner cylinder 210 and the second inner cylinder 310 is larger, and the sealing effect of the first inner cylinder 210 and the second inner cylinder 310 is favorable to be optimized. Meanwhile, the first sealing end 230 and the second sealing end 330 may be offset in the axial direction, and when a new annular gasket 400 is replaced, a slight change in the thickness of the annular gasket 400 may not affect the sealing effect of the joint.
In a preferred embodiment, as shown in fig. 3, the second flange 250 is sleeved on the first outer cylinder 220, and can slide along the extending direction of the first outer cylinder 220; the first outer cylinder 220 has a third annular groove 221, and a retainer 600 is disposed in the third annular groove 221, and the retainer 600 provides a limit to the second flange 250 in the extending direction of the first outer cylinder 220. When the flange joint is assembled, the second flange 250 is first fitted over the first outer tube 220, and then the retainer ring 600 is fitted into the third annular groove 221, so that the second flange 250 cannot be separated from the first outer tube 220. The pre-tightening manner of the stud may affect the sealing effect of the gasket, the second flange 250 is set to be in a loop form, the first flange 200 and the second flange 300 may be abutted together at a proper angle and pressure, and then the stud is screwed tightly, so that the annular gasket 400 is uniformly stressed in the whole process by combining the guiding effect between the first sealing end 230 and the second sealing end 330, and the annular gasket 400 is beneficial to playing a reliable sealing effect. If the screw hole positions of the second flange 250 and the third flange 340 do not correspond to each other, the second flange 250 may be rotated so that the stud may smoothly pass through and connect the second flange 250 and the third flange 340. In the installation process, when the flange joint is welded with the vacuum interlayer pipeline 100, the problem of the relative position of the second flange 250 and the third flange 340 is not needed to be considered, the installation speed is convenient to be increased, the vacuum interlayer pipeline 100 is not needed to be rotated in the adjustment process, and the flange joint is applicable to the vacuum interlayer pipeline which is longer in length or larger in radial size, heavier in weight and the like and inconvenient to rotate.
In a preferred embodiment, as shown in fig. 1 and 2, the end of the first outer cylinder 220 remote from the second flange 300 has a first annular flap 222 extending inwardly in a radial direction, the first annular flap 222 being sealingly secured to the first inner cylinder 210; the end of the second outer cylinder 320, which is far away from the second flange 300, is provided with a second annular folded edge 321 extending inwards along the radial direction, and the second annular folded edge 321 is fixed with the first inner cylinder 210 in a sealing way; annular stress relief grooves 223 are respectively formed in the sides, facing away from the first annular folded edge 222 and the second annular folded edge 321.
The flange and the inner cylinder may be fixed by fillet welding, and the first outer cylinder 220 and the first inner cylinder 210, or the second outer cylinder 320 and the second inner cylinder 310 may be produced by integral manufacturing. When the pressure between the first flange 200 and the second flange 300 is too high, the stress release groove 223 will deform to disperse the stress around the sealing connection of the inner cylinder and the outer cylinder, so as to improve the strength of the flange joint and prolong the service life of the flange joint, and meanwhile, the leakage caused by deformation of the sealing surfaces of the first inner cylinder 210 and the second inner cylinder 310 can be avoided, and the reliability of the flange joint is improved.
In a preferred embodiment, as shown in fig. 1 and 4, the first annular groove 311 includes a first segment 312 and a second segment 313 connected, the first segment 312 being adjacent to the first flange 200, the first segment 312 having a greater groove width than the second segment 313. During the flange joint connection, the first section 312 may guide the annular tongue 211 into the second section 313, facilitating the assembly operation. Meanwhile, the annular tenon 211 is thicker except for the end part, has higher strength, can bear larger stress, and further improves the strength and the service life of the flange joint.
The present invention provides an embodiment of a vacuum sandwich conduit 100 assembly, as shown in fig. 1-4, comprising a vacuum sandwich conduit 100 connected and a flange joint for a vacuum sandwich conduit having the aforementioned features.
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 (8)

1. The utility model provides a flange joint for vacuum intermediate layer pipeline, with vacuum intermediate layer pipeline sealing connection, vacuum intermediate layer pipeline is the hose, vacuum intermediate layer pipeline includes inner tube and outer tube, the inner tube with be the vacuum chamber between the outer tube, its characterized in that includes:
the first flange comprises a first inner cylinder and a first outer cylinder which are arranged at intervals, and one end, far away from the second flange, of the first inner cylinder is connected with one end of the first outer cylinder in a sealing way; the second flange comprises a second inner cylinder and a second outer cylinder which are arranged at intervals, and one end, far away from the first flange, of the second inner cylinder is connected with one end of the second outer cylinder in a sealing way; the first inner cylinder is connected with the second inner cylinder in a sealing way; the end, close to the second flange, of the first outer cylinder is a first sealing end, the end, close to the first flange, of the second outer cylinder is a second sealing end, the radial size of the first sealing end is smaller than that of the second sealing end, and the outer peripheral surface of the first sealing end is in sealing connection with the inner peripheral surface of the second sealing end;
the outer peripheral surface of the first outer cylinder is provided with a first flange and a second flange, the outer peripheral surface of the second outer cylinder is provided with a third flange and a fourth flange, the first flange, the second flange, the third flange and the fourth flange are sequentially arranged, the second flange and the third flange are fixed, so that the first flange and the second flange are fastened in the extending direction of the vacuum interlayer pipeline, the outer side of the first flange and the outer side of the fourth flange are respectively connected with the outer pipe in a sealing mode, and the inner walls of the first inner cylinder and the second inner cylinder are respectively connected with the inner pipe in a sealing mode;
the radial dimensions of the first flange, the second flange, the third flange and the fourth flange are close, and the radial dimensions of the first flange and the second flange are substantially the same as the radial dimensions of the vacuum sandwich pipe.
2. A flange joint for vacuum sandwich piping according to claim 1, characterized in that:
the second flange and the third flange are fixed through a stud.
3. A flange joint for vacuum sandwich piping according to claim 1, characterized in that:
the first inner cylinder is provided with an annular tenon protrusion facing the direction of the second flange, the second inner cylinder is provided with a corresponding first annular groove, an annular gasket is arranged in the first annular groove, and the annular tenon protrusion and the first annular groove are sealed through the annular gasket.
4. A flange joint for vacuum sandwich piping according to claim 1, characterized in that:
the outer peripheral surface of the first sealing end and the inner peripheral surface of the second sealing end are sealed through a sealing ring.
5. A flange joint for vacuum sandwich piping according to claim 1, characterized in that:
the second flange is sleeved on the first outer cylinder and can slide along the extending direction of the first outer cylinder; the first outer cylinder is provided with a third annular groove, a check ring is arranged in the third annular groove, and the check ring is used for limiting the second flange in the extending direction of the first outer cylinder;
and/or the third flange is sleeved on the second outer cylinder and can slide along the extending direction of the second outer cylinder; the second outer cylinder is provided with a third annular groove, a check ring is arranged in the third annular groove, and the check ring is used for limiting the third flange in the extending direction of the second outer cylinder.
6. A flange joint for vacuum sandwich piping according to claim 1, characterized in that:
one end of the first outer barrel, which is far away from the second flange, is provided with a first annular folded edge which extends inwards along the radial direction, and the first annular folded edge is fixed with the first inner barrel in a sealing way;
one end of the second outer cylinder, which is far away from the second flange, is provided with a second annular folded edge which extends inwards along the radial direction, and the second annular folded edge is fixed with the first inner cylinder in a sealing way;
annular stress relief grooves are respectively formed in one sides, away from the first annular folded edges and the second annular folded edges, of the first annular folded edges.
7. A flange joint for vacuum sandwich piping according to claim 3, characterized in that:
the first annular groove comprises a first section and a second section which are connected, the first section is close to the first flange, and the groove width of the first section is larger than that of the second section.
8. A vacuum sandwich tubing assembly, characterized in that: comprising connected vacuum sandwich pipes and a flange joint for vacuum sandwich pipes according to any of claims 1-7.
CN202010857389.7A 2020-08-24 2020-08-24 Flange joint for vacuum interlayer pipeline and vacuum interlayer pipeline assembly Active CN112128494B (en)

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