Polytetrafluoroethylene corrugated compensation pipe

Abstract

The utility model provides a polytetrafluoroethylene corrugated compensation pipe which comprises a corrugated compensation pipe body which is integrally formed by polytetrafluoroethylene and provided with a plurality of expansion joints, and annular outer tension bands are arranged in external grooves formed between every two adjacent expansion joints on the outer side wall of the compensation pipe body in a sleeved mode respectively. Annular inner supporting rings are embedded in the positions, located between every two adjacent expansion joints, of the inner side wall of the compensation pipe body correspondingly, the outer side wall of the compensation pipe body can be reinforced through outer tension bands, and expansion deformation of the compensation pipe body when the compensation pipe body is used in the high-pressure pipeline environment is prevented. The inner supporting ring is used for supporting the inner side wall of the compensation pipe body, the compensation pipe body can be prevented from shrinking and deforming towards the inner side when used in the negative pressure pipeline environment, and the pipe wall supporting force and rigidity of the polytetrafluoroethylene corrugated compensation pipe are improved through the outer tension band and the inner supporting ring; and the stability and the safety of the polytetrafluoroethylene corrugated compensation pipe in the using process are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of corrugated compensating pipes, in particular to a polytetrafluoroethylene corrugated compensating pipe. Background Art

[0002] Corrugated compensating pipe is a common pipeline compensator, which is widely used in petrochemical, instrumentation, aerospace, chemical, electric power, cement, metallurgy and other industries. It is mainly used to compensate for pipeline thermal deformation, shock absorption, and absorption of pipeline settlement deformation.

[0003] Commonly used bellows compensation pipes are mainly metal bellows and plastic bellows. However, in some highly corrosive working environments, metal bellows and plastic bellows are easily oxidized and corroded, and cannot meet actual use requirements. In the prior art, corrugated compensating tubes made of polytetrafluoroethylene have been widely used in highly corrosive working environments. For example, the authorization announcement number CN203517148U discloses a polytetrafluoroethylene bellows compensator, which uses upper and lower flanges to connect the two ends of the polytetrafluoroethylene bellows through a fixing ring, and the outer walls of the upper and lower flanges are respectively provided with corresponding ear plates, and the corresponding ear plates are connected by a stainless steel connecting rod. It has the advantages of low friction coefficient, corrosion resistance, weather resistance, non-moisture absorption, non-flammability, non-oxidation and soft mechanical shape. However, this polytetrafluoroethylene bellows compensator has certain defects in use: since the corrugated tube made of polytetrafluoroethylene is a thin-walled part with poor rigidity, when used in a high-pressure or negative pressure connecting pipeline environment, the pipe wall has insufficient supporting force and is prone to deformation. In severe cases, the polytetrafluoroethylene bellows may rupture, which will affect the normal use of the polytetrafluoroethylene bellows compensator or the connecting pipeline, and there are certain safety hazards. Utility Model Content

[0004] In view of this, it is necessary to provide a polytetrafluoroethylene corrugated compensation tube that can improve the side wall support force and prevent deformation.

[0005] A polytetrafluoroethylene corrugated compensating tube comprises a corrugated compensating tube body integrally formed of polytetrafluoroethylene and having a plurality of expansion joints, annular outer hoops are respectively sleeved in external grooves formed between two adjacent expansion joints on the outer side wall of the compensating tube body, the outer hoops are in contact with the bottom of the external grooves, and annular inner support rings are respectively nested in internal grooves formed between two adjacent expansion joints on the inner side wall of the compensating tube body, the inner support rings are in contact with the bottom of the internal grooves.

[0006] Preferably, the inner support ring is a metal ring, and the outer surface is wrapped with polytetrafluoroethylene.

[0007] Preferably, both ends of the compensation tube body are respectively provided with integrally formed outer flanges, and both ends of the compensation tube body are respectively sleeved with connecting flanges matching the outer flanges.

[0008] Preferably, a limiting groove is provided in an annular manner on the surface where the connecting flange contacts the outer flange, and an annular protrusion matching the limiting groove is provided on the surface where the outer flange contacts the connecting flange, and the annular protrusion is integrally formed with the outer flange of the compensation tube body.

[0009] It can be seen from the above technical scheme that the present application provides a polytetrafluoroethylene corrugated compensating tube, including a corrugated compensating tube body integrally formed of polytetrafluoroethylene and having multiple expansion joints, annular outer hoops are respectively sleeved in external grooves formed between two adjacent expansion joints on the outer wall of the compensating tube body, and annular inner support rings are respectively nested in internal grooves formed between two adjacent expansion joints on the inner wall of the compensating tube body. The outer hoop can be used to reinforce the outer wall of the compensating tube body to prevent the compensating tube body from expanding and deforming when used in a high-pressure pipeline environment, and the inner support ring can be used to support the inner wall of the compensating tube body to prevent the compensating tube body from shrinking and deforming inward when used in a negative pressure pipeline environment. The outer hoop and the inner support ring are used to improve the tube wall supporting force and rigidity of the polytetrafluoroethylene corrugated compensating tube, so that the polytetrafluoroethylene corrugated compensating tube is not easy to deform during use, thereby improving the stability and safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the side structure of the compensation tube body.

[0011] Figure 2 It is a schematic diagram of the three-dimensional structure of the compensation tube body.

[0012] Figure 3 It is a schematic diagram of the cross-sectional structure of the compensation tube body.

[0013] Figure 4 It is a schematic diagram of the assembly of the compensation pipe body and the connecting flange.

[0014] Figure 5 It is a schematic diagram of the assembly of the utility model and the connecting pipeline.

[0015] In the figure: compensation pipe body 1, external groove 2, outer hoop 3, internal groove 4, inner support ring 5, outer flange 6, connecting flange 7, limiting groove 8, annular protrusion 9. DETAILED DESCRIPTION

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Please see Figures 1 to 3 The embodiment of the utility model provides a polytetrafluoroethylene corrugated compensating tube, comprising a corrugated compensating tube body 1 integrally formed of polytetrafluoroethylene and having a plurality of expansion joints, an annular outer hoop 3 is respectively sleeved in an outer groove 2 formed between two adjacent expansion joints on the outer wall of the compensating tube body 1, the outer hoop 3 is in contact with the bottom of the outer groove 2, and the outer hoop 3 can be used to reinforce the outer wall of the compensating tube body 1 to prevent the compensating tube body 1 from expanding and deforming when used in a high-pressure pipeline environment, and an annular inner support ring 5 is respectively nested in an inner groove 4 formed between two adjacent expansion joints on the inner wall of the compensating tube body 1, the inner support ring 5 is in contact with the bottom of the inner groove 4, and the inner support ring 5 is used to support the inner wall of the compensating tube body 1 to prevent the compensating tube body 1 from shrinking and deforming inward when used in a negative pressure pipeline environment. The outer hoop 3 and the inner support ring 5 are preferably made of stainless steel, and in order to prevent the inner support ring 5 from being corroded during use, the outer surface of the inner support ring 5 is wrapped with polytetrafluoroethylene.

[0018] During use, the inner groove 4 and the outer groove 2 formed between two adjacent expansion joints can limit the outer hoop 3 and the inner support ring 5, thereby preventing the outer hoop 3 and the inner support ring 5 from detaching or shifting.

[0019] Please see Figure 3 and Figure 4 Furthermore, both ends of the compensation tube body 1 are respectively provided with integrally formed outer flanges 6, and both ends of the compensation tube body 1 are respectively provided with connecting flanges 7 matching the outer flanges 6 for connecting with external connecting pipelines.

[0020] Please see Figures 3 to 5 Furthermore, in order to prevent the two ends of the compensation tube body 1 from loosening or detaching from the external connecting pipeline during the use of the polytetrafluoroethylene corrugated compensation tube, a limiting groove 8 is provided in an annular manner on the surface where the connecting flange 7 contacts the outer flange 6, and an annular protrusion 9 matching the limiting groove 8 is provided on the surface where the outer flange 6 contacts the connecting flange 7. The annular protrusion 9 is integrally formed with the outer flange 6 of the compensation tube body 1. When the compensation tube body 1 is installed with the external connecting pipeline through the connecting flange 7, the limiting groove 8 on the connecting flange 7 can be pressed on the annular protrusion 9, and the limiting groove 8 is used to limit the outer flange 6 to prevent the outer flange 6 from detaching from the connecting flange 7.

[0021] The polytetrafluoroethylene corrugated compensating tube is constructed by sleeved an outer hoop 3 on the outer wall of the compensating tube body 1, and nested an inner support ring 5 on the inner wall of the compensating tube body 1. The outer hoop 3 and the inner support ring 5 support and reinforce the compensating tube body 1, thereby improving the tube wall supporting force and rigidity of the polytetrafluoroethylene corrugated compensating tube, preventing the compensating tube body 1 from expanding and deforming when used in a high-pressure pipeline environment, and preventing the compensating tube body 1 from shrinking and deforming inward when used in a negative pressure pipeline environment, thereby improving the stability and safety of the polytetrafluoroethylene corrugated compensating tube.

[0022] The above disclosure is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

1. A polytetrafluoroethylene corrugated compensating tube, characterized in that: It comprises a corrugated compensating tube body integrally formed of polytetrafluoroethylene and having a plurality of expansion joints, wherein an annular outer hoop is respectively sleeved in an outer groove formed between two adjacent expansion joints on the outer side wall of the compensating tube body, and the outer hoop contacts the bottom of the outer groove, and an annular inner support ring is respectively nested in an inner groove formed between two adjacent expansion joints on the inner side wall of the compensating tube body, and the inner support ring contacts the bottom of the inner groove.

2. The polytetrafluoroethylene corrugated compensating tube according to claim 1, characterized in that: The inner support ring is a metal ring, and the outer surface of the metal ring is wrapped with polytetrafluoroethylene.

3. The polytetrafluoroethylene corrugated compensating tube according to claim 2, characterized in that: Both ends of the compensation tube body are respectively provided with integrally formed outer flanges, and both ends of the compensation tube body are respectively sleeved with connecting flanges matching the outer flanges.

4. The polytetrafluoroethylene corrugated compensating tube according to claim 3, characterized in that: A limiting groove is provided in an annular manner on the surface where the connecting flange contacts the outer flange, and an annular protrusion matching the limiting groove is provided on the surface where the outer flange contacts the connecting flange, and the annular protrusion is integrally formed with the outer flange of the compensation pipe body.

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