CN107461553B

CN107461553B - High-temperature-resistant corrugated pipe assembly

Info

Publication number: CN107461553B
Application number: CN201710824148.0A
Authority: CN
Inventors: 赵树理; 张国栋; 王辉; 安巧联; 武占利; 曹忠敬; 杨红; 陈云朋
Original assignee: Hebei Chinaust Automotive Plastics Co Ltd
Current assignee: Hebei Chinaust Automotive Plastics Co Ltd
Priority date: 2017-09-13
Filing date: 2017-09-13
Publication date: 2023-03-31
Anticipated expiration: 2037-09-13
Also published as: CN107461553A

Abstract

The invention discloses a high-temperature-resistant corrugated pipe assembly which comprises a core pipe, a sleeve pipe and a PTFE corrugated pipe, wherein the PTFE corrugated pipe is sleeved at the end part of the core pipe, the sleeve pipe is sleeved at the joint of the PTFE corrugated pipe and the core pipe, the inner surface of the sleeve pipe is a plane, and at least one sleeve pipe groove is formed in the outer surface of the sleeve pipe in the circumferential direction. The inner surface of the sleeve assembled by the assembly is designed into a smooth plane, and the outer surface of the sleeve is designed into a groove shape, so that the design can ensure that the outer surface of the core pipe, the PTFE corrugated pipe and the inner surface of the sleeve can be tightly combined when the assembly is buckled and locked, large shearing force can not be generated on PTFE materials, the groove of the sleeve can ensure that the sealing structure has enough sealing stress and sufficient deformation space, and under the condition of large buckling amount, sufficient space can accommodate the deformation of the materials, so that the sealing stress is formed, and the effect of stable sealing is achieved.

Description

High-temperature-resistant corrugated pipe assembly

Technical Field

The invention belongs to the technical field of automobile brake systems, and particularly relates to a high-temperature-resistant corrugated pipe assembly.

Background

The corrugated pipe is a pipe with a regular wave shape, the common corrugated pipe comprises carbon steel, stainless steel, steel lining plastic, aluminum and the like, and is mainly used for connecting pipelines in occasions requiring small bending radius non-concentric axial transmission, or irregular turning, stretching, or absorbing thermal deformation of the pipelines, or inconvenient for installation of fixed elbows, or connecting the pipelines and equipment, gas used by vehicles is transmitted to an air drying pipe or an air storage tank through an air compressor to provide a braking medium for a braking system, the temperature of the gas output by the air compressor can reach 200 ℃, and the PTFE steel wire woven high-temperature corrugated pipe is used between the air compressor and the air dryer and must bear the pressure of 200 ℃ and 3 MPa.

The existing high-temperature corrugated pipe sealing structure is complex in structure, cracks can appear on the cross section of a PTFE (polytetrafluoroethylene) pipe when the PTFE pipe bears small shearing force, so that the sealing stress of the sealing structure is insufficient, and the sealing effect cannot be realized after buckling.

Disclosure of Invention

The invention aims to provide a high-temperature-resistant corrugated pipe assembly to solve the problems that the sealing stress of the sealing structure provided by the background technology is insufficient, and the sealing effect cannot be realized after buckling.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a high temperature resistant bellows assembly, its includes core pipe, sleeve pipe and PTFE bellows, the PTFE bellows cup joints the tip of core pipe, the sleeve pipe cup joints the junction of PTFE bellows and core pipe, sheathed tube internal surface is the plane, sheathed tube surface is provided with at least one sleeve pipe recess along the circumferencial direction.

As an improvement of the high-temperature resistant corrugated pipe assembly provided by the invention, the end part of the core pipe connected with the PTFE corrugated pipe is provided with a step, so that the core pipe is conveniently connected with the PTFE corrugated pipe.

As an improvement of the high-temperature resistant corrugated pipe assembly provided by the invention, the step surface is provided with a core pipe groove.

As an improvement of the high-temperature resistant corrugated pipe assembly provided by the invention, the sleeve is positioned and fixed with the core pipe through a buckling mechanism.

The buckle mechanism comprises a fixing groove arranged on the outer surface of the core pipe and a fixing column arranged on the inner surface of the sleeve, and the fixing groove is matched with the fixing column to realize the positioning and fixing of the core pipe and the sleeve.

As an improvement of the high-temperature resistant corrugated pipe assembly provided by the invention, the at least one sleeve groove is more than two sleeve grooves which are arranged at intervals along the axial direction.

As an improvement of the high temperature resistant corrugated pipe assembly provided by the invention, the sleeve groove is an annular groove.

As an improvement of the high-temperature resistant corrugated pipe assembly provided by the invention, the sleeve grooves are arranged at intervals along the axial direction.

As an improvement of the high-temperature resistant corrugated pipe assembly provided by the invention, the PTFE corrugated pipe is a PTFE steel wire woven corrugated pipe.

Compared with the prior art, the invention has the following beneficial effects:

the inner surface of the sleeve assembled by the assembly is designed into a smooth plane, and the outer surface of the sleeve is designed into a groove shape, so that the design can ensure that the outer surface of the core pipe, the PTFE corrugated pipe and the inner surface of the sleeve can be tightly combined when the assembly is buckled and locked, large shearing force can not be generated on PTFE materials, the groove of the sleeve can ensure that the sealing structure has enough sealing stress and sufficient deformation space, and under the condition of large buckling amount, sufficient space can accommodate the deformation of the materials, so that the sealing stress is formed, and the effect of stable sealing is achieved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

fig. 2 is a schematic structural view after the assembly of the present invention is completed.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and fig. 2, the present invention provides a technical solution: a high-temperature resistant corrugated pipe assembly comprises a core pipe 1, a sleeve 3 and a PTFE corrugated pipe 2.

The PTFE corrugated pipe 2 is sleeved on the end part of the core pipe 1, and the end part of the core pipe 1 connected with the PTFE corrugated pipe 2 is provided with a step 11, so that the PTFE corrugated pipe 2 is conveniently connected. Furthermore, the surface of the step 11 is provided with a core tube groove 12, and the interference fit design of the PTFE corrugated tube 2 and the core tube 1 is realized after the assembly is buckled and pressed.

The sleeve 3 is sleeved at the joint of the PTFE bellows 2 and the core tube 1, that is, the inner surface 32 of the sleeve 3 faces the outer surface of the PTFE bellows 2. The inner surface 32 of the sleeve 3 is a plane, preferably a smooth plane, and the clearance fit design of the PTFE bellows 2 and the sleeve 3 is realized after total pressing and buckling; the outer surface 31 of the sleeve 3 is provided with at least one sleeve groove 33, so that the design can ensure that the PTFE corrugated pipe 2 has a certain space to deform when the assembly is buckled and locked, and sufficient sealing stress is generated to achieve the effect of stable sealing. Preferably, the at least one sleeve groove 33 is two or more sleeve grooves 33 arranged at intervals along the axial direction.

In the concrete implementation, in order to pre-fix the sleeve 3 before the assembly is buckled and pressed so as to ensure the buckling and pressing effect, the sleeve 3 is positioned and fixed with the core pipe 1 through a buckling mechanism. Further, the buckling mechanism comprises a fixing groove 13 arranged on the outer surface of the core tube 1 and a fixing column 34 arranged at the end part of the inner surface 32 of the sleeve 3, and the fixing groove 13 is matched with the fixing column 34 to realize the positioning and fixing of the core tube 1 and the sleeve 3.

It should be noted that the sleeve groove 33 may be an annular groove, or may be formed by a plurality of circumferential grooves. This embodiment is preferably an annular groove. In order to generate enough sealing stress when the assembly of this embodiment is sealed, in this embodiment, the sleeve grooves 33 are provided in total in four, and the four sleeve grooves 33 are provided on the outer surface of the sleeve 3 at even intervals in the axial direction.

In order to improve the pressure resistance of the sealing structure of the high-temperature bellows tube 2, in the present embodiment, the PTFE bellows tube 2 is preferably of a spiral corrugated structure. More preferably, the PTFE bellows 2 is a PTFE steel wire braided bellows, i.e., is braided from a bellows 21 together with stainless steel wires 22.

The working principle and the using process of the invention are as follows: the PTFE corrugated pipe 2 is sleeved at the end part of the core pipe 1, and the sleeve 3 is positioned at the connecting part of the PTFE corrugated pipe 2 and the core pipe 1 through a sleeve 3 fixing column 34 and a sleeve 3 fixing groove 13; and (5) buckling, pressing and locking the assembly to obtain the high-temperature resistant corrugated pipe assembly.

For the high-temperature resistant corrugated pipe assembly, if the inner surface 32 of the sleeve 3 is designed to be a groove structure and the outer surface 31 is a smooth plane, a large shearing force is generated on the materials such as the PTFE corrugated pipe 2 when the materials are buckled and locked, and the cross section of the PTFE corrugated pipe 2 is cracked when the materials bear a small shearing force, and in other words, the large shearing force is generated, so that the sealing failure is easily caused by the design. Furthermore, the PTFE bellows 2 is helically corrugated, and the entire corrugated space must be filled to ensure adequate sealing.

The structural design of the high-temperature resistant corrugated pipe assembly just overcomes the defects, so that large shearing force is not generated when the high-temperature resistant corrugated pipe assembly is buckled, and sufficient sealing stress can be provided to ensure that the assembly has stable and reliable sealing performance. The structural design of the high-temperature resistant corrugated pipe 2 can ensure that when the assembly is buckled and locked, large shearing force cannot be generated on the PTFE corrugated pipe 2 when the outer surface of the core pipe 1, the PTFE corrugated pipe 2 and the inner surface of the sleeve 3 are tightly combined. Meanwhile, the groove design of the outer surface 31 of the sleeve 3 can ensure that the PTFE corrugated pipe 2 has a certain space for deformation when the assembly is buckled and locked, so that enough sealing stress is generated.

Tests show that the bending radius of the high-temperature resistant corrugated pipe assembly can be changed from the existing 100mm to 30mm; meanwhile, the PTFE corrugated pipe can be ensured not to leak under the use pressure of 3MPa after aging in a high-temperature environment of 168h and 200 ℃; after the PTFE corrugated pipe is vibrated for 200 ten thousand times, the pressure is maintained under the pressure of 3MPa without leakage (the vibration frequency is 10HZ, the ambient temperature is 150 ℃, the circulation temperature is minus 40 ℃, and the amplitude is 13 mm). When the inner surface of the sleeve is designed to be a groove and the outer surface is designed to be a smooth plane, the leakage can be caused by a pressure maintaining test under 3MPa after aging for 24 hours, 48 hours or 72 hours in a high-temperature environment at 200 ℃, and a vibration test cannot be carried out under the condition.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A high-temperature-resistant corrugated pipe assembly comprises a core pipe, a sleeve and a PTFE corrugated pipe, wherein the PTFE corrugated pipe is sleeved at the end part of the core pipe, and the sleeve is sleeved at the joint of the PTFE corrugated pipe and the core pipe; the at least one sleeve groove is four sleeve grooves which are uniformly arranged on the outer surface of the sleeve at intervals along the axial direction; with the PTFE bellows is connected the tip of core pipe is provided with the step, be convenient for with the PTFE bellows is connected, the step surface is provided with the core pipe recess, the core pipe recess is used for realizing the interference fit of PTFE bellows and core pipe.

2. The high temperature resistant bellows assembly of claim 1, wherein the sleeve is positioned and secured with the core tube via a snap mechanism.

3. The high-temperature resistant corrugated pipe assembly as claimed in claim 2, wherein the fastening mechanism comprises a fixing groove disposed on the outer surface of the core pipe and a fixing column disposed on the inner surface of the sleeve, and the fixing groove and the fixing column are matched to fix the core pipe and the sleeve.

4. A high temperature resistant bellows assembly as claimed in any one of claims 1 to 3 wherein the sleeve groove is an annular groove.

5. The high temperature resistant bellows assembly of claim 1 wherein the PTFE bellows is a PTFE steel wire braided bellows.