CN210318965U - Corrugated pipe and hard sealing joint structure thereof - Google Patents

Abstract

The utility model discloses a bellows and hard sealing joint structure thereof belongs to the bellows seal field. The utility model discloses a hard sealing joint structure, including setting up in the packing ring in the bellows outside, O type circle, matched with base outer silk and internal thread joint, two adjacent trough section outsides that the bellows inwards caves in are located to O type circle cover respectively, and the bottom opposite flank of base outer silk and internal thread joint is provided with outer silk conical head and internal thread conical head respectively, and the packing ring cover is located the bellows outside and is located between outer silk conical head and the internal thread conical head, and packing ring bottom both ends are located between two O type circles. The hard sealing joint structure of the utility model is convenient to install and operate, can effectively improve the sealing performance, and can prevent the joint from slipping; the utility model discloses a bellows uses above-mentioned hard sealing joint structure, and the safety in utilization can improve to some extent.

Description

Corrugated pipe and hard sealing joint structure thereof

Technical Field

The utility model relates to a bellows seal technical field, more specifically say, relate to a bellows and hard sealing joint design thereof.

Background

The stainless steel corrugated pipe is installed in a conveying pipeline system as a flexible pressure-resistant pipe fitting, is used for compensating mutual displacement of a pipeline or machine and equipment connecting ends, absorbs vibration energy, can play a role in vibration reduction, noise reduction and the like, has the characteristics of good flexibility, light weight, corrosion resistance, fatigue resistance, high and low temperature resistance and the like, can be bent by adopting a thin-wall corrugated pipe made of a stainless steel material, has the advantages of a metal pipe material, and is very suitable for being used in pipelines of tap water, oil, gas and the like. The connection mode of the stainless steel corrugated hose is divided into flange connection, welding, screw thread connection, quick connector connection and the like, wherein the small-caliber metal hose is generally connected by screw threads and the quick connector, and the larger caliber is generally connected by flanges and welded.

Aiming at the application field of conveying pipelines, the requirement on the connection sealing performance of the stainless steel corrugated pipe and other pipe fittings is strict, so that the machining and equipment precision of a connection joint is necessarily required to be very high, otherwise, the potential safety hazard of pipeline substance leakage exists in the actual use process. However, the joint structure on the existing market has various forms, but the quality difference is very large, the general joint adopts the structural form of end face rubber gasket sealing, and when the joint is used under the condition of higher temperature environment, the sealing performance cannot be well guaranteed due to the aging phenomenon, and the service life is greatly limited.

Regarding the research on the form of the corrugated pipe joint, there are a large number of patent publications such as chinese patent application No.: 2013205622030, filing date: in 2013, 9 and 11 months, the invention and creation name is as follows: the utility model provides a bellows end connection is with connecting, this application discloses a bellows end connection is with connecting, should connect including connecting casing and compression nut, connects the casing including the first link that is equipped with the external screw thread to and be equipped with the internal screw thread second link, compression nut includes that the bellows inserts the end, and is equipped with the third link that external screw thread and second link are connected, is equipped with the elasticity lock ring that is compressed tightly between terminal surface in the second link and the third link top. This application compresses tightly the effect to elasticity check ring through connecting casing and compression nut, and then compresses tightly the bellows tip.

Also as in chinese patent application No.: 201610077348X, filing date: 2016, 2, 1 and 1, 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 a 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 auto-lock function of nut and joint. Chinese patent application No.: 2014104429995, filing date: 9/2/2014, the application discloses a hard sealing structure of a stainless steel corrugated hose joint, which comprises a split type snap ring capable of blocking a nut from falling off, wherein the split type snap ring is arranged at a corrugated neck part at the end part of a corrugated hose penetrating through the nut, and a pipe orifice corrugated ring of the corrugated hose in a snap ring annular cavity is formed into a conical ring clamped on the conical surface of the snap ring annular cavity through wave beating; the conical surface of the end part of the outer screw joint is embedded with a metal ring and matched with the conical ring. Chinese patent application No.: 2016100162378, filing date: 2016, 1, 7.s, the application discloses a quick mounting joint for a gas corrugated pipe, which comprises a radially telescopic clamp ring, wherein the outer side wall of the clamp ring is provided with first inclined planes distributed along the axial direction, and an opening at one end of the clamp ring is provided with a flange part extending towards the center direction of the clamp ring; when the nut screw in connects, the snap ring is driven at radial movement by the nut to make flange portion joint on the lateral wall of bellows.

In summary, the above applications are all good hard sealing methods for stainless steel corrugated pipes, but due to the limitations of the self-structure and material characteristics of the stainless steel corrugated pipes, the sealing performance of the stainless steel corrugated pipes in practice still faces a great challenge, and the research on the sealing performance of the corrugated pipes is still a hot spot in the industry.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The utility model aims to overcome the defects of poor sealing performance and influence on use safety of the stainless steel corrugated pipe joint in the prior art, and provides a corrugated pipe and a hard sealing joint structure thereof;

the hard sealing joint structure of the corrugated pipe of the utility model is convenient to install and operate, can effectively improve the sealing performance, and can prevent the joint from slipping;

the utility model discloses a bellows uses above-mentioned hard sealing joint structure, and the safety in utilization can improve to some extent, suitable popularization and application.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model discloses a hard sealing joint structure of bellows, including setting up in the packing ring in the bellows outside, O type circle, matched with base outer silk and internal thread joint, the inside sunken two adjacent trough section outsides of bellows are located to O type circle cover respectively, and the bottom opposite flank of base outer silk and internal thread joint is provided with outer silk conical head and internal thread conical head respectively, and the packing ring cover is located the bellows outside and is located between outer silk conical head and the internal thread conical head, and packing ring bottom both ends are located between two O type circles.

Furthermore, the corrugated pipe further comprises an inner support ring, wherein the inner support ring is clamped at the inner side of the outwards-protruded wave crest section of the corrugated pipe; and the inner support ring is positioned in the wave crest section between two adjacent wave crest sections where the two O-shaped rings are positioned.

Furthermore, the inner support ring is a non-closed ring body with an opening at the end.

Furthermore, the opposite wall surfaces at the two ends of the opening of the inner support ring are respectively provided with a matched sawtooth structure.

Further, the gasket includes an upper ring portion, a middle ring portion, and a lower ring portion in this order; the width of the middle ring part is smaller than the width of the upper ring part and the lower ring part at two ends of the middle ring part, extrusion grooves with openings gradually increased along the direction away from the middle ring part are formed on two sides of the middle ring part respectively, and the extrusion grooves on the two sides are matched with the outer thread conical head and the inner thread conical head correspondingly respectively.

Further, the length of the lower ring part extending along the length direction of the corrugated pipe is not less than the length of the upper ring part, and two ends of the lower ring part are positioned between the two O-shaped rings.

Furthermore, the material of the gasket is red copper.

Furthermore, a sealing ring is arranged between the outer thread of the base and the upper part of the inner thread joint.

Furthermore, one end of the outer wire conical head, which is far away from the gasket, extends upwards to form a vertical extension section, and one end of the inner wire conical head, which is far away from the gasket, is connected with a horizontal extension section.

The utility model discloses a bellows has as above hard sealing joint design.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following effect of showing:

(1) the utility model discloses a bellows adopts the inner support ring to carry out stabilizing support in the inboard crest of bellows, adopts packing ring and O type circle to effectively extrude at bellows outside trough fit in, and the stable metal is sealed firmly in the bilateral fit realization, can effectively promote sealing performance, prevents the pipeline leakage, prolongs the life of bellows, suitable using widely.

(2) The utility model discloses a bellows sealing joint structure firmly, two adjacent trough section outsides that the bellows is inwards sunken are located to O type circle cover respectively, the bellows outside is located and is located between outer silk cone and the interior silk cone to the packing ring then the cover, the packing ring makes its top middle part of location at bellows crest position owing to the effect of both sides O type circle under the initial condition, the packing ring takes place plastic deformation when outer silk cone and interior silk cone extrude each other, both ends correspond respectively to block in the clearance between both sides O type circle and the middle crest, make the bellows outside and joint portion form hard seal, the reinforcing is to the leakproofness of pipeline, life and safety in utilization can all obtain improving the promotion by a wide margin.

(3) The utility model discloses a bellows sealing joint structure firmly forms the arc after the packing ring receives extrusion plastic deformation and holds tightly in the crest of bellows outer lane, makes the bellows receive axial force back joint portion difficult for droing in the use, and the packing ring both plays sealed effect and plays the snap ring effect, and overall structure part is less, installs comparatively portably.

(4) The utility model discloses a bellows hard sealing joint structure, the inner support ring is equipped with the open-ended non-closed ring body for the tip, be equipped with matched with zigzag structure on the relative wall in inner support ring open-ended both ends respectively, when the inner support ring opens and resumes initial condition, opening both ends meshing cooperation top is tight, can effectively ensure the stability and the accuracy of inner support ring position, make the inner support ring closely laminate on bellows crest segment inner wall, atress shrinkage deformation again can not appear at the ring body both ends, lead to the not hard up condition of inner support ring in bellows crest segment, effectively ensure inner support intensity and the stability to the bellows.

Drawings

Fig. 1 is a schematic view of an initial state structure of a hard sealing joint structure of a corrugated pipe according to the present invention;

FIG. 2 is a schematic view of a portion A of FIG. 1;

fig. 3 is a schematic structural view of a hard sealing joint structure of a corrugated pipe according to the present invention in a screwed state;

FIG. 4 is a schematic view of a portion of the enlarged structure at B in FIG. 3;

fig. 5 is a schematic structural view of the middle and inner support ring of the present invention;

fig. 6 is a schematic structural view of the middle and inner support ring mounting unit of the present invention;

fig. 7 is a schematic structural view of a middle bellows according to the present invention.

The reference numerals in the schematic drawings illustrate:

100. a bellows; 110. a coating layer; 120. an O-shaped ring; 130. a seal ring; 140. a layer of Teflon; 150. a composite mesh glue layer;

200. base outer threads; 210. an external thread conical head; 220. a vertically extending section;

300. an internal thread joint; 310. an internal thread conical head; 320. a horizontally extending section;

400. a gasket; 410. an upper ring portion; 420. a middle ring part; 430. a lower ring portion; 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 (4) a notch.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed 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 present invention will be further described with reference to the following examples.

Example 1

As shown in fig. 1 to 7, the hard sealing joint structure for corrugated pipes of this embodiment includes a gasket 400, an O-ring 120, a base outer wire 200 and an inner wire connector 300, which are disposed on the outer side of the corrugated pipe 100, wherein the O-ring 120 is respectively sleeved on the outer sides of two adjacent valley sections of the corrugated pipe 100, the outer side of the base outer wire 200 and the inner side of the inner wire connector 300 are respectively provided with an outer wire conical head 210 and an inner wire conical head 310, the gasket 400 is sleeved on the outer side of the corrugated pipe 100 and is located between the outer wire conical head 210 and the inner wire conical head 310, and two ends of the bottom of the gasket 400 are located between the two O-rings 120. The outer thread 200 and the inner thread joint 300 of the base in this embodiment are structural forms commonly adopted in the hard sealing joint of the corrugated pipe 100, and the hard sealing is realized by matching and screwing, and the specific structure and the matching use principle of the hard sealing joint all belong to the conventional technology in the industry, and are not described herein again. In this embodiment, a sealing ring 130 is further disposed between the upper portion of the base outer wire 200 and the upper portion of the inner wire connector 300, and a coating layer 110 is further disposed on the outer side of the corrugated pipe 100.

As shown in fig. 2, in the present embodiment, the outer screw tap-shaped head 210 and the inner screw conical head 310 are respectively located at the bottom of the outer screw 200 and the bottom of the inner screw joint 300 of the base, and are distributed relatively, the cross-sectional area thereof gradually decreases along the direction close to the washer 400, and the end portions thereof are both smooth arc end surfaces, one end of the outer screw tap-shaped head 210 far from the washer 400 extends upward to form a vertical extension section 220, and one end of the inner screw conical head 310 far from the washer 400 is connected to 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 part 410 comprises a vertical section and a tapered section which are downward in sequence until the upper ring part is connected with the middle ring part 420 which is downward in sequence, the lower ring part 430 comprises a gradually expanding section and a vertical section which are downward in sequence, the gradually expanding section is connected with the middle ring part 420, the width of the middle ring part 420 is obviously smaller than that of the upper ring part 410 and the lower ring part 430 at two ends of the middle ring part, so that extrusion grooves 440 with gradually increasing openings along the direction away from the middle ring part 420 are formed at two sides of the middle ring part 420 respectively, the length of the lower ring part 430 extending along the length direction of the corrugated pipe 100 is not smaller than that of the upper ring part 410, and two ends of the lower ring part 430 are positioned between. The extrusion grooves 440 on both sides are respectively and correspondingly matched with the outer wire conical head 210 and the inner wire conical head 310, when the outer wire 200 and the inner wire joint 300 of the base are relatively screwed and extruded, the opposite outer wire conical head 210 and the inner wire conical head 310 are mutually extruded into the extrusion grooves 440, the gasket 400 is positioned at the upper middle part of the wave crest position of the corrugated pipe 100 under the initial state due to the action of the O-rings 120 on both sides, when the outer wire conical head 210 and the inner wire conical head 310 are mutually extruded, the gasket 400 is plastically deformed, both ends of the lower ring part 430 are deformed to downwards extrude the corrugated pipe 100, and both ends are respectively and correspondingly clamped into the gaps between the O-rings 120 on both sides and the middle wave crest, as shown in figures 3 and 4, the outer side of the corrugated pipe 100 and the joint part form hard sealing, the lower ring part 430 forms an arc shape and is tightly embraced in the wave crest of the outer ring of the corrugated pipe 100, so, and the gasket 400 plays a role of sealing and a role of clamping ring, so that the whole structure has fewer parts and the installation is simpler and more convenient. In this embodiment, the gasket 400 may be made of red copper, which can be plastically deformed under the action of extrusion.

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 deformed by force and clamped between the O-rings 120 on the two sides, and tightly clasped to the outer ring of the corrugated pipe 100, thereby enhancing the sealing performance of the pipe. The vertical extension section 220 is arranged above the outer wire conical head 210, the vertical extension section 220 is connected with a horizontal section above the vertical extension section 220 after extending for a certain height, the bottom plane of the horizontal section is in close contact with the top plane of the upper ring part 410, the height of the vertical extension section of the upper ring part 410 is not less than that of the vertical extension section 220 above the outer wire conical head 210, when the outer wire 200 and the inner wire joint 300 of the base are screwed tightly, one end of the vertical section of the upper ring part 410 is correspondingly clamped into a gap between the vertical extension section 220 and the outer wire conical head 210, the other end of the vertical section of the upper ring part 410 extends along the direction of the horizontal extension section 320 of the inner wire conical head 310, and therefore sufficient sealing performance of the gasket 400 between the outer wire 200 and the inner wire joint 300 of the base is guaranteed.

The bellows of this embodiment adopts the hard sealing joint structure of this embodiment, and sealed effectual and connect and be difficult for droing, and life and safety in utilization performance all obtain improving the promotion by a wide margin. And the bellows of this embodiment adopts metal material and other multiple materials complex to form, have outstanding high pressure resistant, high temperature resistant, performances such as anti-external force, and have metal bellows wear-resisting anticorrosive performance concurrently, performance is obviously promoted, specifically as shown in fig. 7, bellows 100 including stainless steel material, use bellows 100 as the substrate, the cladding has teflon layer 140 and compound adhesive net layer 150 in proper order on bellows 100 outer wall, compound adhesive net layer 150 is including the canvas stratum reticulare and the silica gel layer of interweaving, the canvas stratum reticulare is woven by the canvas and is formed. The silica gel layer evenly coats on teflon layer 140 surface, and the silica gel layer evenly coats on the outside crest and the wave valley face of teflon layer 140 promptly, and the canvas net layer is attached on the crest face of teflon layer 140. During actual processing, a teflon layer 140 is uniformly electroplated on the outer wall of the corrugated pipe 100, liquid silica gel is coated on the outer side of the teflon layer 140, the liquid silica gel is coated on the wave crest and wave trough sections of the teflon layer 140, a canvas net layer is formed by weaving canvas silk threads on the outer side of the teflon layer 140, the canvas net layer is attached to the outer wall of the wave crest protruding from the teflon layer 140, high-temperature curing treatment is performed on the surface of the pipeline, the liquid silica gel is cured and bulges out of the gaps of the canvas net layer to form the composite mesh glue layer 150, and the composite mesh glue layer 150 is integrally attached to the wave crest surface of the teflon layer 140. In this embodiment, the outer side of the corrugated pipe 100 is further provided with a coating layer 110, that is, the outer side of the composite mesh adhesive layer 150 is further provided with the coating layer 110, and the position of the end of the corrugated pipe 100 where the hard seal joint unit is disposed is usually that the coating layer 110 and the composite mesh adhesive layer 150 at the end of the corrugated pipe 100 are firstly peeled off, and then the corrugated pipe body inside is exposed and installed.

In this embodiment, the teflon layer 140 and the composite mesh adhesive layer 150 are sequentially compounded on the outer side of the corrugated tube substrate 100, the composite mesh adhesive layer 150 adopts a form that the canvas mesh layer and the silica gel layer are interwoven, and the woven canvas mesh is used as an attachment bearing carrier of the silica gel to enable the canvas mesh layer and the silica gel layer to be interwoven to form an integral mixed layer, which helps to effectively enhance the attachment between the canvas mesh layer and the corrugated tube 100 and fully ensure the strength of the corrugated tube 100. In this embodiment, the wall thickness H of the corrugated pipe 100 is not more than 0.2mm, the corrugation density on the corrugated pipe 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 glue layer 150 is 25-40um (namely, the thickness of the composite mesh glue layer 150 covering the top wave peak 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 are arranged between

Wherein k is (0.7-1.2); the thickness H2 of the composite mesh glue layer 150 is equal to the thickness H of the corrugated pipe 100

Wherein a is (0.5-2); by controlling the precise dimensions 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 wall thickness H of the bellows 100 is 0.2mm, the corrugation density of the bellows 100 is 2.8mm, the thickness H1 of the electroplated teflon layer 140 is 10um, the thickness H2 of the composite mesh adhesive layer 150 is 27um, and the thickness of the electroplated teflon layer 140 is 0.2mm

Thickness of composite mesh adhesive layer 150

In the embodiment, the wall thickness and the corrugation density of the corrugated pipe 100 are matched with each other, so that the pipe wall is thinner and denser, the hardness of the base material can be effectively reduced, the flexibility of the material is enhanced, and the inherent performances of pressure resistance, wear resistance, high temperature resistance and the like of stainless steel are kept. The flexibility of the pipe wall is enhanced, so that the corrugated pipe 100 can be effectively bent and flexibly applied, the problem that the conventional corrugated pipe 100 cannot be overlong due to the limitation of flexibility is solved, and on the basis, the high and low temperature resistance, the wear resistance, the corrosion resistance and the like of the corrugated pipe 100 are further enhanced through the electroplated Teflon layer 140. The stretching resistance of the canvas used by the canvas net layer used in the embodiment is not less than 1200N, the strength is high, the canvas silk threads are directly woven into a net outside the Teflon layer 140 to form a high-efficiency strong protection net cover, and the inner and outer interwoven silica gel layers formed by the swelling of the silica gel are matched, so that the strength of the corrugated pipe 100 can be effectively enhanced, the woven mesh canvas is more beneficial to improving the surface hand feeling of the corrugated pipe 100, the touch softness and hardness are suitable for better hand feeling, 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 pipeline is greatly limited when the corrugated pipe is used, the corrugated pipe is formed by splicing multiple sections of pipelines when the pipeline is arranged in a long distance, the construction is troublesome, the guarantee of the sealing performance is also a great problem when the pipeline is spliced, the conventional splicing mode is formed by welding multiple pipelines, welding slag is formed in the pipeline, and the pipeline conveying quality is easily influenced in long-term use; although the rubber pipe has certain flexibility and is convenient to bend, the performances of pressure resistance, wear resistance, corrosion resistance and the like can not adapt to complex use environments, various metal corrugated pipes 100 and rubber pipe composite hose structures exist in the industry, but the rubber pipe is only used as an outer protective pipe sleeve, the flexibility limitation of the metal corrugated pipes 100 is difficult to improve fundamentally, the length of the pipeline is still limited greatly, the multiple sections of rubber pipes are difficult to connect by adopting a mechanical structure during splicing, the rubber pipes are fastened by adopting a clamp form, the problem of leakage at the connecting point is easy to occur, and various problems and risks are caused to production practice. This embodiment then has effectively strengthened bellows 100's pliability through the control to bellows 100 thickness and ripple density, can make bellows 100 length unrestricted during the use, simultaneously according to substrate self characteristic through the accurate complex of multilayer material, make bellows 100 when keeping good pliability, its intensity is effectively ensured, even also can directly be through setting up threaded connection in bellows 100 inside when needing the concatenation between the multistage pipeline, make screw between the different pipelines can, not only easy and simple to handle is nimble, and effectively ensured the leakproofness that bellows 100 connects, prevent the leakage problem, actual performance obviously promotes. Practice proves that the composite metal corrugated pipe 100 of the embodiment can repeatedly swing for fifteen thousand times at an amplitude of 45 degrees under the condition of one kilogram of vertical weight, so that leakage is avoided, and the use performance is safe and reliable.

Example 2

The hard sealing joint structure of the corrugated pipe in this embodiment is substantially the same as that in embodiment 1, and further, in this embodiment, the hard sealing joint structure further includes an inner support ring 500, where the inner support ring 500 is clamped inside a crest section protruding outwards of the corrugated pipe 100; and the inner support ring 500 is located in a peak section between two adjacent valley sections where the two O-rings 120 are located. Specifically, the two O-rings 120 are respectively clamped on the inward first and second wave crest sections of the end of the corrugated pipe 100, and the inner support ring 500 is located in the wave crest section between the two O-rings 120. The inner support ring 500 is a metal ring such as stainless steel, and is supported on the inner side of the corrugated pipe 100, when the outer wire conical head 210 and the inner wire conical head 310 mutually press the gasket 400, the gasket 400 is plastically deformed and inwards presses the middle wave crest section, the inner support ring 500 is just positioned in the wave crest section to provide effective inner support, the mutual pressing action enables the outer side of the corrugated pipe 100 and the joint part to form a hard seal, and the metal hard seal is adopted, so that the service life is long, and the high temperature resistance is realized. The setting of inner support ring 500 has effectively ensured the sealing stability and the intensity at bellows 100 hard seal position in this embodiment, prevents that the body from taking place to warp defects such as revealing, and the safety in utilization obtains effective guarantee.

In this embodiment, the inner support ring 500 is a non-closed ring body with an opening at an end, so that the inner support ring 500 has certain elasticity, and the inner diameter thereof can be contracted and expanded to be installed in the wave crest section of the inner side of the corrugated pipe 100 in a matching manner, as shown in fig. 5, 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 from front to back, so that the inner support ring 500 can extend into the inner side of the corrugated pipe 100 and reach the corresponding wave crest position, then the inner support ring 500 is expanded to be expanded in the wave crest 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 returns to a normal state and is just completely attached to the inner wall of the wave crest section of the corrugated pipe 100. Further, in this embodiment, the opposite wall surfaces at the two ends of the opening of the inner support ring 500 are respectively provided with a matched sawtooth structure, when the inner support ring 500 is opened to restore the initial state, the two ends of the opening are engaged and matched to be tightly pushed, so that the stability and accuracy of the position of the inner support ring 500 can be effectively guaranteed, the inner support ring 500 is tightly attached to the inner wall of the wave crest section of the corrugated pipe 100, the two ends of the ring body are not stressed again to shrink and deform, the inner support ring 500 is loosened in the wave crest section of the corrugated pipe 100, and the inner support strength and stability of the corrugated pipe 100 are effectively guaranteed.

In this embodiment, the installation of the inner supporting ring 500 can be implemented by using an installation unit, as shown in fig. 6, the installation unit of this embodiment includes an outer fixing tube 600, one side of the outer fixing tube 600 is provided with a strip-shaped notch 630 along the length direction, so that the outer fixing tube 600 has a certain outer expansion and retraction elasticity, an inner telescopic tube 610 is movably fitted in the inner cavity of the outer fixing tube 600, the inner telescopic tube 610 can move along the length direction in the outer fixing tube 600, an expansion part 620 which gradually expands outwards is arranged at the end of the inner telescopic tube 610, the cross-sectional area of the expansion part 620 gradually increases along the direction far away from the outer fixing tube 600, the outer wall surface of the expansion part 620 is an arc-shaped wall surface which is in smooth transition with the wall surface of the inner telescopic tube 610, the outer diameter of the expansion part 620 is greater than the inner cavity diameter of the outer fixing tube 600, the inner supporting ring 500 is sleeved at the end of the outer fixing tube 600, the outer fixing tube 600, the outer fixing tube 600 and the inner supporting ring 500 are inserted into the corrugated tube 100, so that the inner supporting ring 500 reaches the position of the corresponding wave crest inside the corrugated tube 100, then the inner telescopic tube 610 is pulled outwards, as shown by the arrow in fig. 6, the expansion part 620 at the end part of the inner telescopic tube is gradually close to the outer fixing tube 600, when the outer diameter of the expansion part 620 is larger, the outer fixing tube 600 expands outwards and the inner supporting ring 500 expands outwards at the same time, so that the inner supporting ring 500 is expanded, completely attached and clamped in the wave crest inside the corrugated tube 100, 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 tube 610 is reset inwards, so that the expansion part 620 is separated from the inner cavity part of the outer fixing tube 600, and then the installation unit is integrally taken out. The installation unit can be used for quickly installing the inner support ring 500, and is simple and convenient to operate.

The joint design of sealed firmly of this embodiment adopts inner support ring 500 to carry out the outrigger in the inboard crest of bellows 100, and the cooperation adopts packing ring 400 and O type circle 120 to carry out effective extrusion in the trough of bellows 100 outside, and two-way cooperation realizes stable metal hard seal, can effectively promote sealing performance, prevents the pipeline leakage, prolongs the life of bellows 100, suitable using widely.

Example 3

The corrugated pipe of this embodiment, basically the same as above-mentioned embodiment, the difference is that, corrugated pipe 100 inboard still is provided with sensing fiber membrane in this embodiment, not only can effectively detect whether the pipeline is impaired to can transmit the detected signal, guarantee the real-time supervision to pipeline quality and transport state, further guarantee the security performance of pipeline use.

In this embodiment, the wall thickness H of the stainless steel corrugated tube 100 is 0.2mm, and the corrugation density of the corrugated tube 100 is 3 mm; the thickness h1 of the Teflon layer 140 is 11um, the thickness h2 of the composite mesh glue layer 150 is 34um, and the thickness of the electroplated Teflon layer 140

Thickness of composite mesh adhesive layer 150

Example 4

The corrugated tube of this embodiment is basically the same as the above embodiments, except that the wall thickness H of the stainless steel corrugated tube 100 in this embodiment is 0.1mm, and the corrugation density of the corrugated tube 100 is 2.9 mm; the thickness h1 of the Teflon layer 140 is 12um, the thickness h2 of the composite mesh glue layer 150 is 25um, and the thickness of the electroplated Teflon layer 140

Thickness of composite mesh adhesive layer 150

Example 5

The corrugated tube of the present embodiment is basically the same as the above embodiments, except that the wall thickness H of the stainless steel corrugated tube 100 in the present embodiment is 0.1mm, and the corrugation density of the corrugated tube 100 is 3 mm; the thickness h1 of the Teflon layer 140 is 10um, the thickness h2 of the composite mesh glue layer 150 is 28um, and the thickness of the electroplated Teflon layer 140

Thickness of composite mesh adhesive layer 150

Example 6

The corrugated tube of the present embodiment is basically the same as the above embodiments, except that the wall thickness H of the stainless steel corrugated tube 100 in the present embodiment is 0.2mm, and the corrugation density of the corrugated tube 100 is 3 mm; the thickness h1 of the Teflon layer 140 is 12um, the thickness h2 of the composite mesh glue layer 150 is 40um, and the thickness of the electroplated Teflon layer 140

Thickness of composite mesh adhesive layer 150

Example 7

The corrugated tube of the present embodiment is basically the same as the above embodiments, except that the wall thickness H of the stainless steel corrugated tube 100 in the present embodiment is 0.1mm, and the corrugation density of the corrugated tube 100 is 3 mm; the thickness h1 of the Teflon layer 140 is 11um, the thickness h2 of the composite mesh glue layer 150 is 30um, and the thickness of the electroplated Teflon layer 140

Thickness of composite mesh adhesive layer 150

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a joint design is sealed firmly to bellows which characterized in that: including setting up in packing ring (400) in bellows (100) outside, O type circle (120), matched with outer silk (200) of base and internal thread joint (300), two adjacent trough section outsides of bellows (100) inside sunken are located to O type circle (120) cover respectively, the bottom opposite flank of outer silk (200) of base and internal thread joint (300) is provided with outer silk conical head (210) and internal thread conical head (310) respectively, packing ring (400) cover is located bellows (100) outside and is located between outer silk conical head (210) and internal thread conical head (310), and packing ring (400) bottom both ends are located between two O type circles (120).

2. A bellows hard seal joint construction according to claim 1, wherein: the corrugated pipe is characterized by further comprising an inner supporting ring (500), wherein the inner supporting ring (500) is clamped on the inner side of the outwards-protruding wave crest section of the corrugated pipe (100); and the inner support ring (500) is positioned in a wave crest section between two adjacent wave crest sections where the two O-shaped rings (120) are positioned.

3. A bellows hard seal joint construction according to claim 2, wherein: the inner support ring (500) is a non-closed ring body with an opening at the end.

4. A bellows hard seal joint construction according to claim 3, wherein: the opposite wall surfaces of the two ends of the opening of the inner support ring (500) are respectively provided with a matched sawtooth structure.

5. A bellows hard seal joint construction according to claim 1, wherein: the washer (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 width of the upper ring part (410) and the lower ring part (430) at two ends of the middle ring part, extrusion grooves (440) with gradually increasing openings along the direction away from the middle ring part (420) are respectively formed at two sides of the middle ring part (420), and the extrusion grooves (440) at the two sides are respectively correspondingly matched with the outer thread conical head (210) and the inner thread conical head (310).

6. A bellows hard seal joint design according to claim 5, wherein: 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).

7. A bellows hard seal joint construction according to claim 1, wherein: the material of the gasket (400) is red copper.

8. A bellows hard seal joint construction according to any one of claims 1-7, wherein: a sealing ring (130) is arranged between the upper parts of the outer thread (200) and the inner thread joint (300) of the base.

9. A bellows hard seal joint construction according to claim 1 or 5, wherein: one end of the outer thread conical head (210) far away from the gasket (400) extends upwards to form a vertical extension section (220), and one end of the inner thread conical head (310) far away from the gasket (400) is connected with a horizontal extension section (320).

10. A corrugated pipe, characterized by: having the hard sealing joint construction of any one of claims 1-9.

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