CN110220049B - Composite metal bellows with hard seal joint - Google Patents
Composite metal bellows with hard seal joint Download PDFInfo
- Publication number
- CN110220049B CN110220049B CN201910624212.XA CN201910624212A CN110220049B CN 110220049 B CN110220049 B CN 110220049B CN 201910624212 A CN201910624212 A CN 201910624212A CN 110220049 B CN110220049 B CN 110220049B
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- Prior art keywords
- corrugated pipe
- layer
- gasket
- ring
- joint
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Classifications
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- 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
- F16L9/02—Rigid pipes of metal
- F16L9/06—Corrugated pipes
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- 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
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0206—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the collar not being integral with the pipe
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- 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
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/0212—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means
- F16L19/0218—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member using specially adapted sealing means comprising only sealing rings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Abstract
The invention discloses a composite metal corrugated pipe with a hard sealing joint, and belongs to the field of corrugated pipes. The invention comprises a corrugated pipe, wherein the outer wall of the corrugated pipe is sequentially coated with a teflon layer and a composite net adhesive layer, and the composite net adhesive layer comprises a canvas net layer and a silica gel layer which are interwoven with each other; the corrugated pipe end is provided with a hard sealing joint unit, the hard sealing joint unit comprises a gasket, an O-shaped ring, a matched base external thread and an internal thread joint, the gasket, the O-shaped ring and the internal thread joint are arranged on the outer side of the corrugated pipe, the O-shaped ring is sleeved on the outer side of two adjacent trough sections of the corrugated pipe, which are concave inwards, the opposite sides of the bottoms of the base external thread and the internal thread joint are respectively provided with an external thread conical head and an internal thread conical head, the gasket is sleeved on the outer side of the corrugated pipe and is positioned between the external thread conical head and the internal thread conical head, and two ends of the bottom of the gasket are positioned between the two O-shaped rings. The invention can effectively improve the tightness, prevent the joint from slipping, improve the use safety performance to some extent and is suitable for popularization and application.
Description
Technical Field
The invention relates to the technical field of corrugated pipes, in particular to a composite metal corrugated pipe with a hard sealing joint.
Background
The corrugated pipe is used as a flexible pressure-resistant pipe fitting to be installed in a conveying pipeline system and used for compensating the mutual displacement of connecting ends of pipelines or machines and equipment, absorbing vibration energy, playing roles of vibration reduction, noise reduction and the like, and has the characteristics of good flexibility, light weight, corrosion resistance, fatigue resistance, high and low temperature resistance and the like. The stainless steel corrugated pipe connection mode is divided into flange connection, welding, screw thread connection, quick joint connection and the like, the small-caliber metal hose is generally connected with the quick joint by adopting screw threads, and the larger caliber metal hose is generally connected with the flange connection and the welding.
Aiming at the application field of the conveying pipeline, the connecting sealing performance of the stainless steel corrugated pipe and other pipe fittings is strict, so that the processing and equipment precision of the connecting joint is also required to be very high, otherwise, the potential safety hazard of pipeline material leakage exists in the actual use process. However, the existing joint in the market has various structural forms, but the quality difference is very large, the general joint adopts the structural form of sealing with an end surface rubber pad, when the joint is used under the condition of higher temperature environment, the sealing performance is not well ensured due to the aging phenomenon, and the service life is greatly limited. Meanwhile, how to enhance the performance of the corrugated pipe and prevent the leakage of the pipeline is receiving more attention in the industry.
With regard to the form of bellows joint, a great deal of patent has been published, such as chinese patent application No.: 2013205622030, filing date: the invention is provided with the following creative names of 2013, 9 and 11 days: the application discloses a joint for connecting ends of corrugated pipes, which comprises a joint shell and a compression nut, wherein the joint shell comprises a first connecting end provided with external threads and a second connecting end provided with internal threads, the compression nut comprises a corrugated pipe inserting end and a third connecting end provided with external threads and connected with the second connecting end, and a compressed elastic locking ring is arranged between the inner end surface of the second connecting end and the top end of the third connecting end. This application compresses tightly the bellows tip through the effect of pressing down of joint housing and compression nut to the elasticity locking ring.
Another example is chinese patent application No.: 201610077348X, filing date: the application discloses a quick and safe integral joint device for a stainless steel corrugated hose, wherein a first groove is formed in the inner side of the end part of the joint, and a second groove is formed in the outer side wall of a nut; still including the joint at first recess, the first snap ring in the second recess, through the first snap ring of card income in first recess and second recess, can realize the inside self-locking function of nut and joint. Chinese patent application No.: 2014104429995, filing date: the application discloses a hard sealing structure of a stainless steel corrugated hose joint, which comprises a split type clamping ring capable of blocking a nut from falling out, wherein the split type clamping ring is arranged at a wave neck part penetrating into the end part of a corrugated hose in the nut, and a pipe orifice wave ring of the corrugated hose in a ring cavity of the clamping ring is formed into a conical ring clamped on the conical surface of the ring cavity of the clamping ring by beating waves; the conical surface of the end part of the external thread connector is embedded with a metal ring and is matched with the conical ring. Chinese patent application No.: 2016100162378, filing date: the application discloses a quick mounting joint for a corrugated pipe for gas, which comprises a radially telescopic clamping ring, wherein a first inclined surface which is axially distributed is arranged on the outer side wall of the clamping ring, and a flange part which extends towards the center of the clamping ring is arranged at one end of the clamping ring in an opening manner; when the nut is screwed into the joint, the nut drives the snap ring to move in the radial direction, and the flange part is clamped on the outer side wall of the corrugated pipe.
In summary, the above application is not lost as a good hard sealing mode for the stainless steel corrugated pipe, but due to the limitations of the structure and the material characteristics of the stainless steel corrugated pipe, the sealing performance of the stainless steel corrugated pipe still faces a great challenge in practice, and the research on the sealing performance of the corrugated pipe is still a hot spot in the industry.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects of poor sealing performance and influence on use safety of a corrugated pipe joint in the prior art and provides a composite metal corrugated pipe with a hard sealing joint; the composite metal corrugated pipe with the hard sealing joint is convenient to install and operate, can effectively improve the sealing performance, can prevent the joint from slipping, has improved use safety performance, and is suitable for popularization and application.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the invention relates to a composite metal corrugated pipe with a hard sealing joint, which comprises a corrugated pipe, wherein a teflon layer and a composite net adhesive layer are sequentially coated on the outer wall of the corrugated pipe, the composite net adhesive layer comprises a canvas net layer and a silica gel layer which are mutually interweaved, and the canvas net layer is formed by weaving canvas; the corrugated pipe end is provided with a hard sealing joint unit, the hard sealing joint unit comprises a gasket, an O-shaped ring, a matched base external thread and an internal thread joint, the gasket, the O-shaped ring and the internal thread joint are arranged on the outer side of the corrugated pipe, the O-shaped ring is sleeved on the outer side of two adjacent trough sections of the corrugated pipe, which are concave inwards, the opposite sides of the bottoms of the base external thread and the internal thread joint are respectively provided with an external thread conical head and an internal thread conical head, the gasket is sleeved on the outer side of the corrugated pipe and is positioned between the external thread conical head and the internal thread conical head, and two ends of the bottom of the gasket are positioned between the two O-shaped rings.
Furthermore, the silica gel layer is uniformly coated on the outer surface of the teflon layer, and the canvas net layer is attached to the crest surface of the teflon layer.
Further, the corrugated pipe is made of stainless steel, the pipe wall thickness of the corrugated pipe is not more than 0.2mm, and the corrugated density of the corrugated pipe is 2.8-3mm.
Further, the teflon layer is electroplated on the outer side of the corrugated pipe, the thickness of the teflon layer is 10-12um, and the thickness of the composite net adhesive layer is 25-40um.
Still further, the hard sealing joint unit further comprises an inner supporting ring, wherein the inner supporting ring is clamped on the inner side of the wave crest section of the corrugated pipe protruding outwards; and the inner support ring is located in the peak section between two adjacent valley sections where the two O-rings are located.
Further, the inner support ring is a non-closed ring body with an opening at the end.
Furthermore, the two opposite wall surfaces of the opening of the inner support ring are respectively provided with a matched zigzag structure.
Further, the gasket sequentially comprises an upper ring part, a middle ring part and a lower ring part; the width of the middle ring part is smaller than that of the upper ring part and the lower ring part at the two ends of the middle ring part, extrusion grooves which are gradually increased along the direction away from the middle ring part are respectively formed at the two sides of the middle ring part, and the extrusion grooves at the two sides are respectively matched with the outer tap-shaped head and the inner tap-shaped head correspondingly.
Further, the length of the lower ring part extending along the length direction of the corrugated pipe is not smaller than the extending length of the upper ring part, and two ends of the lower ring part are positioned between the two O-shaped rings.
Further, one end of the outer screw conical head far away from the gasket extends upwards to form a vertical extension section, and one end of the inner screw tap conical head far away from the gasket is connected with a horizontal extension section.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) The composite metal corrugated pipe with the hard sealing joint is formed by compounding a metal material and other various materials, has outstanding high pressure resistance and external force resistance, has wear resistance, corrosion resistance and other performances of the metal corrugated pipe, and has the advantages that the service performance of the corrugated pipe is obviously improved.
(2) According to the composite metal corrugated pipe with the hard sealing joint, the inner supporting ring is adopted in the wave crest at the inner side of the corrugated pipe to carry out stable supporting, the gasket and the O-shaped ring are matched in the wave trough at the outer side of the corrugated pipe to carry out effective extrusion, and the two-way matching realizes stable metal hard sealing, so that the sealing performance can be effectively improved, the leakage of a pipeline is prevented, the service life of the corrugated pipe is prolonged, and the composite metal corrugated pipe is suitable for popularization and use.
(3) According to the composite metal corrugated pipe with the hard sealing joint, the O-shaped rings are respectively sleeved on the outer sides of two adjacent trough sections of the corrugated pipe, the gasket is sleeved on the outer sides of the corrugated pipe and is positioned between the outer tap-shaped head and the inner tap-shaped head, the gasket is positioned in the middle of the upper part of the crest position of the corrugated pipe under the action of the O-shaped rings on the two sides in an initial state, when the outer tap-shaped head and the inner tap-shaped head are mutually extruded, the gasket is subjected to plastic deformation, and the two ends of the gasket are correspondingly clamped into gaps between the O-shaped rings on the two sides and the middle crest, so that the outer sides of the corrugated pipe and the joint part form hard sealing, the sealing performance of a pipeline is enhanced, and the service life and the use safety performance are greatly improved.
(4) According to the composite metal corrugated pipe with the hard sealing joint, the gasket is extruded and plastically deformed to form an arc shape to be held tightly in the wave crest of the outer ring of the corrugated pipe, so that the joint part of the corrugated pipe is not easy to fall off after the corrugated pipe is subjected to axial force in the use process, the gasket plays a role of both sealing and clamping, the whole structural parts are fewer, and the installation is simpler and more convenient.
(5) According to the composite metal corrugated pipe with the hard sealing joint, the inner support ring is the non-closed ring body with the opening at the end part, the matched zigzag structures are respectively arranged on the opposite wall surfaces of the two ends of the opening of the inner support ring, when the inner support ring is unfolded and restored to the initial state, the two ends of the opening are meshed and matched tightly propped, so that the stability and the accuracy of the position of the inner support ring can be effectively ensured, the inner support ring is tightly attached to the inner wall of the corrugated pipe peak section, the situation that the inner support ring loosens in the corrugated pipe peak section due to the fact that the two ends of the ring body are stressed and contracted again cannot occur is avoided, and the inner support strength and the stability of the corrugated pipe are effectively ensured.
Drawings
FIG. 1 is a schematic view of the joint initial state structure of a composite metal bellows with a hard seal joint according to the present invention;
FIG. 2 is a schematic view of a partial enlarged structure at A in FIG. 1;
FIG. 3 is a schematic view of the joint tightening state structure of the composite metal bellows with a hard seal joint according to the present invention;
FIG. 4 is a schematic view of a partial enlarged structure at B in FIG. 3;
FIG. 5 is a schematic view of the structure of the inner support ring of the present invention;
FIG. 6 is a schematic view of the structure of the inner support ring mounting unit of the present invention;
fig. 7 is a schematic structural view of a bellows according to the present invention.
Reference numerals in the schematic drawings illustrate:
100. a bellows; 110. a coating layer; 120. an O-ring; 130. a seal ring; 140. a teflon layer; 150. a composite net adhesive layer;
200. a base outer wire; 210. an outer wire conical head; 220. a vertically extending section;
300. an inner wire joint; 310. an inner tap-shaped head; 320. a horizontal extension;
400. a gasket; 410. an upper ring part; 420. a middle ring part; 430. a lower ring part; 440. extruding the groove;
500. an inner support ring; 600. an outer fixed cylinder; 610. an inner telescopic cylinder; 620. an expansion section; 630. and (5) a notch.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention is further described below with reference to examples.
Example 1
As shown in fig. 1 to 7, the composite metal bellows with the hard sealing joint of the present embodiment is formed by compounding a metal material with other various materials, has outstanding performances of high pressure resistance, high temperature resistance, external force resistance and the like, and has performances of wear resistance, corrosion resistance and the like of the metal bellows, the service performance is obviously improved, and particularly as shown in fig. 7, the composite metal bellows with the hard sealing joint comprises a bellows 100 made of stainless steel, the bellows 100 is taken as a base material, a teflon layer 140 and a composite mesh adhesive layer 150 are sequentially coated on the outer wall of the bellows 100, the composite mesh adhesive layer 150 comprises a canvas mesh layer and a silica gel layer which are interwoven, and the canvas mesh layer is formed by weaving canvas. The silica gel layer is uniformly coated on the outer surface of the teflon layer 140, that is, the silica gel layer is uniformly coated on the outer wave crest and wave trough surfaces of the teflon layer 140, and the canvas net layer is attached on the wave crest surface of the teflon layer 140. In actual processing, a layer of teflon layer 140 is uniformly electroplated on the outer wall of the corrugated pipe 100, then liquid silica gel is coated on the outer side of the teflon layer 140, the wave crest and wave trough sections of the teflon layer 140 are coated with the liquid silica gel, then canvas wires are woven on the outer side of the teflon layer 140 to form a canvas mesh layer, the canvas mesh layer is attached to the outer wall of the protruding wave crest of the teflon layer 140, then high-temperature curing treatment is carried out on the surface of the pipeline, the liquid silica gel is cured and bulges out from the mesh gaps of the canvas mesh layer to integrally form a composite mesh adhesive layer 150, and the composite mesh adhesive layer 150 is integrally attached to the wave crest surface of the teflon layer 140.
In the embodiment, the substrateThe outer side of the corrugated pipe 100 is sequentially compounded with the teflon layer 140 and the compound net adhesive layer 150, the compound net adhesive layer 150 adopts a form of interweaving a canvas net layer and a silica gel layer, and the braided canvas net is used as an attaching bearing carrier of the silica gel to interweave the canvas net layer and the silica gel layer to form an integral mixed layer, so that the adhesive property of the canvas net layer and the corrugated pipe 100 is effectively enhanced, and the strength of the corrugated pipe 100 is fully ensured. In this embodiment, the wall thickness H of the bellows 100 is not more than 0.2mm, the density of the corrugations on the bellows 100 is 2.8-3mm, and the other composite material layers are controlled as follows: the thickness H1 of the Teflon layer 140 is 10-12um, the thickness H2 of the composite mesh adhesive layer 150 is 25-40um (i.e. the thickness of the composite mesh adhesive layer 150 coated on the top crest surface of the Teflon layer 140), and meanwhile, the thickness H1 of the Teflon layer 140 and the thickness H of the corrugated pipe 100 areWherein k is (0.7-1.2); the thickness H2 of the composite mesh adhesive layer 150 is +.>Wherein a is (0.5-2); by precise dimensional control of the substrate layer and the composite layer, a greater improvement in the performance of the bellows 100 is achieved.
Specifically, in this embodiment, the thickness H of the wall of the bellows 100 is 0.2mm, the corrugation density of the bellows 100 is 2.8mm, the thickness H1 of the plated teflon layer 140 is 10um, the thickness H2 of the composite mesh adhesive layer 150 is 27um, and the thickness of the plated teflon layer 140Thickness of composite mesh glue layer 150>According to the embodiment, through the mutual matching of the wall thickness and the corrugated density of the corrugated pipe 100, the wall is thinner and denser, the hardness of a base material can be effectively reduced, the flexibility of a material is enhanced, and meanwhile, the inherent performances of pressure resistance, wear resistance, high temperature resistance and the like of stainless steel are reserved. The enhanced flexibility of the tube wall facilitates efficient bending and flexible application of the bellows 100, solving the problem of the present bellows 100 due to the flexibilityThe problem that the limitation cannot be excessively set is that the high and low temperature resistance, the wear resistance, the corrosion resistance and the like of the corrugated pipe 100 are further enhanced by the electric plating of the teflon layer 140. The tensile resistance of the canvas used in the canvas net layer used in the embodiment is not less than 1200N, the strength is higher, the canvas silk threads are directly woven into a net on the outer side of the teflon layer 140 to form a high-efficiency strong protection net sleeve, and the high-efficiency strong protection net sleeve is matched with an inner and outer interweaved silica gel layer formed by swelling silica gel, so that the strength of the corrugated pipe 100 can be effectively enhanced, the woven net canvas is more beneficial to improving the surface hand feeling of the corrugated pipe 100, the touch softness of the woven net canvas is suitable, the hand feeling is better, and the operation experience is improved.
The conventional corrugated pipe 100 in the industry at present has various forms such as a metal pipe, a rubber pipe or a multilayer pipe, wherein the metal pipe has high strength but poor flexibility, the length of the pipe is greatly limited when the corrugated pipe is used, the long-distance pipe arrangement is formed by splicing a plurality of sections of pipes, the construction is troublesome, the sealing performance is also difficult to ensure when the pipes are spliced, the conventional splicing mode is formed by welding a plurality of pipes, welding slag is formed in the pipes, and the conveying quality of the pipes is easily influenced when the corrugated pipe is used for a long time; although the rubber tube has certain flexibility and is convenient to bend, the performances of pressure resistance, wear resistance, corrosion resistance and the like cannot be suitable for complex use environments, various hose structures formed by compounding the metal corrugated tube 100 and the rubber tube exist in the industry, the rubber tube is only used as an outer protective sleeve, the flexible limit of the metal corrugated tube 100 is difficult to fundamentally improve, the length of a pipeline is still greatly limited, a plurality of sections of rubber tubes are difficult to be connected by adopting a mechanical structure during splicing, and the rubber tubes are fastened in a clamping hoop mode, so that the joint is extremely easy to cause leakage problems, and various problems and risks are caused to production practice. The flexibility of the corrugated pipe 100 is effectively enhanced through the control of the thickness and the corrugated density of the corrugated pipe 100, the length of the corrugated pipe 100 is not limited during use, meanwhile, the corrugated pipe 100 is enabled to maintain good flexibility through accurate compounding of multiple layers of materials according to the characteristics of a base material, the strength of the corrugated pipe 100 is effectively guaranteed, screw threads can be directly arranged inside the corrugated pipe 100 even if a plurality of sections of pipelines are needed to be spliced, screwing among different pipelines is achieved, the operation is simple and flexible, the connection tightness of the corrugated pipe 100 is effectively guaranteed, leakage problems are prevented, and the practical use performance is obviously improved. The practice proves that the composite metal corrugated pipe 100 can repeatedly swing for ten thousands of five thousands of times under the condition of one kilogram of vertical weight, so that the leakage is avoided, and the use performance is safe and reliable.
It should be noted that, in this embodiment, the bellows 100 is sealed in a hard sealing manner, specifically, as shown in fig. 1, a hard sealing joint unit is disposed at an end of the bellows 100, the hard sealing joint unit includes a gasket 400 disposed at an outer side of the bellows 100, an O-ring 120, a base outer wire 200 and an inner wire joint 300 that are matched with each other, wherein the O-ring 120 is respectively sleeved at an outer side of two adjacent trough segments of the bellows 100 that are concave inwards, opposite bottom sides of the base outer wire 200 and the inner wire joint 300 are respectively provided with an outer wire conical head 210 and an inner tap 310, the gasket 400 is sleeved at an outer side of the bellows 100 and is located between the outer wire conical head 210 and the inner tap 310, and two ends of the bottom of the gasket 400 are located between the two O-rings 120. In this embodiment, the base outer wire 200 and the inner wire joint 300 are commonly adopted in the hard sealing joint of the bellows 100, and are hard sealed by tightening the two joints together, and the specific structure and the principle of use of the two joints belong to conventional technologies in the industry, and will not be described herein. In this embodiment, a sealing ring 130 is further disposed between the base outer wire 200 and the upper portion of the inner wire joint 300, a coating layer 110 is further disposed on the outer side of the corrugated tube 100, that is, a coating layer 110 is further disposed on the outer side of the composite mesh adhesive layer 150, and the position of the hard sealing joint unit disposed at the end portion of the corrugated tube 100 is generally that the coating layer 110 and the composite mesh adhesive layer 150 at the end portion of the corrugated tube 100 are stripped first, and then the corrugated tube body is exposed and installed.
As shown in fig. 2, in this embodiment, the outer wire conical head 210 and the inner tap-shaped head 310 are respectively located at the bottoms of the base outer wire 200 and the inner wire connector 300 and are distributed relatively, the cross-sectional area of the outer wire conical head 210 and the inner tap-shaped head is gradually reduced along the direction close to the gasket 400, the end parts of the outer wire conical head 210 are smooth arc-shaped end surfaces, one end of the outer wire conical head 210 far away from the gasket 400 extends upwards to form a vertical extension section 220, and one end of the inner wire conical head 310 far away from the gasket 400 is connected with a horizontal extension section 320. Correspondingly, the gasket 400 includes an upper ring portion 410, a middle ring portion 420, and a lower ring portion 430 in this order; the upper ring portion 410 includes a vertical section and a tapered section which are downward in sequence until being connected with the middle ring portion 420 which is downward in sequence, the lower ring portion 430 includes a divergent section and a vertical section which are downward in sequence, the divergent section is connected with the middle ring portion 420, the width of the middle ring portion 420 is obviously smaller than the widths of the upper ring portion 410 and the lower ring portion 430 at two ends thereof, so that extrusion grooves 440 which are gradually increased along the direction away from the middle ring portion 420 are respectively formed at two sides of the middle ring portion 420, the length of the lower ring portion 430 extending along the length direction of the corrugated tube 100 is not smaller than the extending length of the upper ring portion 410, and two ends of the lower ring portion 430 are positioned between the two O-shaped rings 120. The extrusion grooves 440 on two sides are respectively matched with the outer thread conical head 210 and the inner tap-shaped head 310, so that when the outer thread 200 and the inner thread joint 300 of the base are oppositely screwed and extruded, the opposite outer thread conical head 210 and the inner tap-shaped head 310 are mutually extruded into the extrusion grooves 440, the gasket 400 is positioned in the middle part above the wave crest position of the corrugated pipe 100 under the action of the O-shaped rings 120 on two sides in the initial state, the gasket 400 is plastically deformed when the outer thread conical head 210 and the inner thread conical head 310 are mutually extruded, two ends of the lower ring part 430 are deformed and downwards extruded the corrugated pipe 100, and the two ends are correspondingly clamped into gaps between the O-shaped rings 120 on two sides and the middle wave crest respectively, as shown in fig. 3 and 4, the outer side of the corrugated pipe 100 and the joint part form hard sealing, the lower ring part 430 forms arc-shaped holding in the wave crest of the outer ring of the corrugated pipe 100, the joint part is not easy to fall off after the corrugated pipe 100 is subjected to axial force in the use process, the gasket 400 plays the role of a sealing effect, the whole structural part is less, and the installation is simpler. In particular, in this embodiment, the gasket 400 may be made of red copper, and may be plastically deformed under the extrusion action.
In this embodiment, the length of the lower ring portion 430 is not less than the extension length of the upper ring portion 410, so that the two end portions of the lower ring portion 430 can be fully ensured to be forced to deform and be clamped between the O-rings 120 at two sides, and tightly held on the outer ring of the bellows 100, so as to enhance the tightness of the pipeline. The vertical extension section 220 is arranged above the outer wire conical head 210, the vertical extension section 220 is connected with the horizontal section above after extending for a certain height, the bottom plane of the horizontal section is closely contacted with the top plane of the upper ring portion 410, the height of the vertical extension section of the upper ring portion 410 is not less than that of the vertical extension section 220 above the outer wire conical head 210, when the base outer wire 200 and the inner wire connector 300 are screwed with each other, one end of the vertical section of the upper ring portion 410 is correspondingly clamped into a gap between the vertical extension section 220 and the outer wire conical head 210, and the other end of the vertical section of the upper ring portion 410 extends along the direction of the horizontal extension section 320 of the inner wire conical head 310, so that the gasket 400 is beneficial to guaranteeing sufficient tightness between the base outer wire 200 and the inner wire connector 300.
Example 2
The composite metal bellows with a hard seal joint of this embodiment is substantially the same as embodiment 1, and further, the hard seal joint unit in this embodiment further includes an inner support ring 500, where the inner support ring 500 is clamped inside the crest section of the bellows 100 protruding outwards; and the inner support ring 500 is located in the peak segment between two adjacent valley segments where two O-rings 120 are located. Specifically, two O-rings 120 are respectively crimped over first and second inwardly facing valley segments of the end of the bellows 100, and an inner support ring 500 is positioned in the peak segment between the two O-rings 120. The inner support ring 500 is made of metal, such as stainless steel, and is supported on the inner side of the corrugated tube 100, when the outer screw tapered head 210 and the inner screw tap head 310 press the gasket 400 against each other, the gasket 400 is plastically deformed and presses the middle peak section inward, and the inner support ring 500 is just positioned in the peak section to provide effective support on the inner side, and the mutual pressing action forms a hard seal between the outer side of the corrugated tube 100 and the joint part, and the metal hard seal is adopted, so that the corrugated tube has long service life and high temperature resistance. The arrangement of the inner support ring 500 in this embodiment effectively ensures the sealing stability and strength of the hard sealing part of the bellows 100, prevents the defects of deformation and leakage of the pipe body, and effectively ensures the use safety.
In this embodiment, the inner support ring 500 is a non-closed ring body with an opening at the end, so that the inner support ring 500 has a certain elasticity, the inner diameter of the inner support ring can be contracted and expanded to be installed in the peak section of the inner side of the corrugated pipe 100, as shown in fig. 5, fig. a is a contracted state before the inner support ring 500 is installed, two ends of the opening of the ring body are in a spiral state staggered front and back, so that the inner support ring 500 can extend into the inner side of the corrugated pipe 100 and reach the corresponding peak position, then the inner support ring 500 is expanded and expanded to be opened in the peak section of the corrugated pipe 100 and the ring bodies at two ends of the opening are opposite, at this time, the inner support ring 500 is restored to a normal state and is just completely attached to the inner wall of the peak section of the corrugated pipe 100, thereby providing effective support for the inner wall of the corrugated pipe 100 and guaranteeing the hard sealing effect. Further, in this embodiment, the opposite wall surfaces at two ends of the opening of the inner support ring 500 are respectively provided with a matched zigzag structure, and by setting the structure, when the inner support ring 500 is opened to restore to the initial state, the two ends of the opening are engaged and matched to tightly prop up, so that the stability and accuracy of the position of the inner support ring 500 can be effectively ensured, the inner support ring 500 is tightly attached to the inner wall of the wave crest section of the corrugated pipe 100, the situation that the two ends of the ring body are stressed and contracted again to deform, and the inner support ring 500 loosens in the wave crest section of the corrugated pipe 100 is caused, and the inner support strength and stability of the corrugated pipe 100 are effectively ensured.
In this embodiment, the inner supporting ring 500 may be installed by using an installation unit, as shown in fig. 6, where the installation unit of this embodiment includes an outer fixing cylinder 600, one side of the outer fixing cylinder 600 is provided with a strip-shaped gap 630 along the length direction, so that the outer fixing cylinder 600 has a certain elasticity of expanding and contracting outwards, an inner telescopic cylinder 610 is movably matched with an inner cavity of the outer fixing cylinder 600, the inner telescopic cylinder 610 can move in the outer fixing cylinder 600 along the length direction, an expanding portion 620 that expands outwards is provided at the end of the inner telescopic cylinder 610, the cross-sectional area of the expanding portion 620 increases gradually along the direction away from the outer fixing cylinder 600, the outer wall surface of the expanding portion 620 is an arc wall surface that transitions smoothly with the wall surface of the inner telescopic cylinder 610, the outer diameter of the expanding portion 620 is larger than the inner cavity diameter of the outer fixing cylinder 600, the inner supporting ring 500 is sleeved at the end of the outer fixing cylinder 600, before installation, the outer fixing cylinder 600 and the inner supporting ring 500 are in a contracted state, the outer fixing cylinder 600 and the inner supporting ring 500 are stretched into the corrugated pipe 100, the inner supporting ring 500 reaches the corresponding peak position on the inner side of the corrugated pipe 100, then the inner telescopic cylinder 610 is outwards drawn, as shown by the arrow direction in fig. 6, the expanding part 620 at the end part gradually approaches the outer fixing cylinder 600, when the outer diameter of the expanding part 620 reaches the inner cavity position of the outer fixing cylinder 600, the outer fixing cylinder 600 expands outwards, simultaneously the inner supporting ring 500 expands outwards, the inner supporting ring 500 is fully adhered and clamped in the peak on the inner side of the corrugated pipe 100, the two ends of the opening of the inner supporting ring 500 are meshed and matched, the structural stability of the inner supporting ring 500 is fully ensured, after the inner supporting ring 500 is installed, the inner telescopic cylinder 610 is inwards reset, the expanding part 620 is separated from the inner cavity position of the outer fixing cylinder 600, and then taking out the whole installation unit. The mounting unit can be used for rapidly mounting the inner support ring 500, and is simple and convenient to operate.
The hard sealing joint unit of the embodiment adopts the inner supporting ring 500 to stably support in the wave crest at the inner side of the corrugated pipe 100, adopts the gasket 400 and the O-shaped ring 120 to effectively extrude in the wave crest at the outer side of the corrugated pipe 100 in a matched manner, realizes stable metal hard sealing in a bidirectional matched manner, can effectively improve the sealing performance, prevent the leakage of a pipeline, prolongs the service life of the corrugated pipe 100, and is suitable for popularization and use.
Example 3
The composite metal bellows with the hard sealing joint in this embodiment is basically the same as the above embodiment, except that in this embodiment, the sensing optical fiber film is further disposed on the outer side of the bellows 100, so that whether the pipeline is damaged or not can be effectively detected, detection signals can be transmitted, real-time monitoring of quality and conveying state of the pipeline is ensured, and safety performance of pipeline use is further ensured.
In the embodiment, the wall thickness H of the stainless steel corrugated pipe 100 is 0.2mm, and the corrugated density of the corrugated pipe 100 is 3mm; the thickness h1 of the Teflon layer 140 is 11um, the thickness h2 of the composite mesh adhesive layer 150 is 34um, and the thickness of the electroplated Teflon layer 140Thickness of composite mesh glue layer 150>
Example 4
The composite metal bellows with the hard seal joint of the present embodiment is basically the same as the above embodiment, except that the wall thickness H of the stainless steel bellows 100 in the present embodiment is 0.1mm, and the bellows density of the bellows 1002.9mm; the thickness h1 of the Teflon layer 140 is 12um, the thickness h2 of the composite mesh adhesive layer 150 is 25um, and the thickness of the electroplated Teflon layer 140Thickness of composite mesh glue layer 150>
Example 5
The composite metal bellows with the hard seal joint of the present embodiment is basically the same as the above embodiment, except that the wall thickness H of the stainless steel bellows 100 in the present embodiment is 0.1mm, and the bellows density of the bellows 100 is 3mm; the thickness h1 of the Teflon layer 140 is 10um, the thickness h2 of the composite mesh adhesive layer 150 is 28um, and the thickness of the electroplated Teflon layer 140Thickness of composite mesh glue layer 150>
Example 6
The composite metal bellows with the hard seal joint of the present embodiment is basically the same as the above embodiment, except that the wall thickness H of the stainless steel bellows 100 in the present embodiment is 0.2mm, and the bellows density of the bellows 100 is 3mm; the thickness h1 of the Teflon layer 140 is 12um, the thickness h2 of the composite mesh adhesive layer 150 is 40um, and the thickness of the electroplated Teflon layer 140Thickness of composite mesh glue layer 150>
Example 7
The composite metal bellows with the hard seal joint of the present embodiment is basically the same as the above embodiment, except that the wall thickness H of the stainless steel bellows 100 of the present embodiment is 0.1mmAnd the corrugated density of the corrugated tube 100 is 3mm; the thickness h1 of the Teflon layer 140 is 11um, the thickness h2 of the composite mesh adhesive layer 150 is 30um, and the thickness of the electroplated Teflon layer 140Thickness of composite mesh glue layer 150>
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (5)
1. Composite metal bellows with hard seal joint, its characterized in that: the novel plastic composite pipe comprises a corrugated pipe (100), wherein a teflon layer (140) and a composite net adhesive layer (150) are sequentially coated on the outer wall of the corrugated pipe (100), the composite net adhesive layer (150) comprises a canvas net layer and a silica gel layer which are interwoven with each other, and the canvas net layer is formed by weaving canvas; the end part of the corrugated pipe (100) is provided with a hard sealing joint unit, the hard sealing joint unit comprises a gasket (400), an O-shaped ring (120), a matched base outer wire (200) and an inner wire joint (300) which are arranged on the outer side of the corrugated pipe (100), the O-shaped ring (120) is respectively sleeved on the outer sides of two adjacent trough sections of the inward concave of the corrugated pipe (100), the opposite sides of the bottoms of the base outer wire (200) and the inner wire joint (300) are respectively provided with an outer wire conical head (210) and an inner screw tap head (310), the gasket (400) is sleeved on the outer side of the corrugated pipe (100) and is positioned between the outer screw tap head (210) and the inner screw tap head (310), and two ends of the bottom of the gasket (400) are positioned between the two O-shaped rings (120);
the hard sealing joint unit further comprises an inner supporting ring (500), wherein the inner supporting ring (500) is clamped on the inner side of the outwards protruding crest section of the corrugated pipe (100); and the inner support ring (500) is positioned in a crest section between two adjacent trough sections where the two O-shaped rings (120) are positioned; the inner support ring (500) is a non-closed ring body with an opening at the end part; the opposite wall surfaces of the two ends of the opening of the inner support ring (500) are respectively provided with a matched zigzag structure;
the gasket (400) comprises an upper ring part (410), a middle ring part (420) and a lower ring part (430) in sequence; the width of the middle ring part (420) is smaller than the widths of the upper ring part (410) and the lower ring part (430) at the two ends of the middle ring part, extrusion grooves (440) which are gradually increased along the opening direction away from the middle ring part (420) are respectively formed at the two sides of the middle ring part (420), and the extrusion grooves (440) at the two sides are respectively matched with the outer tap-shaped head (210) and the inner tap-shaped head (310) correspondingly; the length of the lower ring part (430) extending along the length direction of the corrugated pipe (100) is not less than the extending length of the upper ring part (410), and two ends of the lower ring part (430) are positioned between the two O-shaped rings (120).
2. The composite metal bellows with a hard seal joint according to claim 1, wherein: the silica gel layer is evenly coated on the outer surface of the teflon layer (140), and the canvas net layer is attached to the crest surface of the teflon layer (140).
3. The composite metal bellows with a hard seal joint according to claim 1, wherein: the corrugated pipe (100) is made of stainless steel, the pipe wall thickness of the corrugated pipe (100) is not more than 0.2mm, and the corrugated density of the corrugated pipe (100) is 2.8-3mm.
4. The composite metal bellows with a hard seal joint according to claim 1, wherein: the teflon layer (140) is electroplated on the outer side of the corrugated pipe (100), the thickness of the teflon layer (140) is 10-12um, and the thickness of the composite mesh adhesive layer (150) is 25-40um.
5. The composite metal bellows with a hard seal joint according to any one of claims 1-4, wherein: the end of the outer screw conical head (210) far away from the gasket (400) extends upwards to form a vertical extension section (220), and the end of the inner screw tap head (310) far away from the gasket (400) is connected with a horizontal extension section (320).
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| CN201910624212.XA CN110220049B (en) | 2019-07-11 | 2019-07-11 | Composite metal bellows with hard seal joint |
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| CN201910624212.XA CN110220049B (en) | 2019-07-11 | 2019-07-11 | Composite metal bellows with hard seal joint |
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| CN112879091B (en) * | 2021-02-23 | 2023-08-29 | 安徽中隧典凯建设工程有限公司 | Tunnel corrugated steel duct end reinforcing device |
| CN115339237B (en) * | 2021-11-18 | 2023-12-22 | 杭州秉信环保包装有限公司 | Printer oil pipe |
| CN114541402A (en) * | 2022-01-12 | 2022-05-27 | 深圳市工勘岩土集团有限公司 | Hydraulic expansion hole sealing pipe for high-pressure grouting of tree root pile |
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| CA1182145A (en) * | 1981-09-17 | 1985-02-05 | Burchus Q. Barrington | High-pressure fluid flow connector |
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