CN218031883U - Steel lining polytetrafluoroethylene corrugated soft joint - Google Patents
Steel lining polytetrafluoroethylene corrugated soft joint Download PDFInfo
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- CN218031883U CN218031883U CN202221981956.0U CN202221981956U CN218031883U CN 218031883 U CN218031883 U CN 218031883U CN 202221981956 U CN202221981956 U CN 202221981956U CN 218031883 U CN218031883 U CN 218031883U
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- polytetrafluoroethylene
- stainless steel
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- corrugated
- soft joint
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Abstract
The utility model discloses a steel lining polytetrafluoroethylene ripple soft joint in pipeline processing technology field, including stainless steel casing and polytetrafluoroethylene inside lining, its characterized in that: the stainless steel casing is the ripple body, is equipped with the polytetrafluoroethylene inside lining in the bellows body, and the polytetrafluoroethylene inside lining is the static pressure sintering shaping, and the polytetrafluoroethylene inside lining bonds at the inner wall of stainless steel casing through hot pressing, and the polytetrafluoroethylene inside lining is laminated with the bellows inner wall of stainless steel casing mutually, is equipped with high temperature resistant viscose layer between polytetrafluoroethylene inside lining and the stainless steel casing inner wall. The utility model has the advantages of high temperature resistance, high vacuum degree, long service life and the like.
Description
Technical Field
The utility model relates to a steel lining polytetrafluoroethylene ripple soft joint in pipeline processing technology field.
Background
At present, the polytetrafluoroethylene steel lining equipment designed and produced in China comprises a steel lining polytetrafluoroethylene flexible joint which is mainly a pure polytetrafluoroethylene corrugated pipe flexible joint and a stainless steel lining polytetrafluoroethylene corrugated pipe flexible joint. The polytetrafluoroethylene tube is mostly formed by welding plates, winding, sintering and the like; the polytetrafluoroethylene corrugated pipe is formed by manual or electric heating air-entrapping forming. The polytetrafluoroethylene layer is relatively thin. Typically 1.5mm to 3mm thick.
The teflon corrugated flexible joint with such thickness has the following disadvantages: and (1) the wall thickness of the polytetrafluoroethylene pipe is relatively thin. The tube has poor compactness by adopting an extrusion molding process and a winding sintering molding process.
(2) The polytetrafluoroethylene tube is easy to deform under high temperature and is seriously shrunk under cold and heat.
(3) The flanging corners of the thin-walled tube are easy to be further thinned, so that slight strain is caused, and stress concentration (microcracks) are easy to generate.
(4) Only can resist lower temperature, positive pressure and lower vacuum degree.
(5) More manufacturers increase the negative pressure ring in the inner corrugation of the steel-lined polytetrafluoroethylene corrugated soft joint, but the negative pressure ring is influenced by the forming process, so that the service life is short, and meanwhile, the space in the corrugated groove is occupied, and the compensation amount of the steel-lined polytetrafluoroethylene corrugated soft joint is reduced.
Disclosure of Invention
In order to overcome the shortcoming that the present steel lining polytetrafluoroethylene ripple soft joint is not high temperature resistant, high vacuum, the utility model provides a high temperature resistant high vacuum steel lining polytetrafluoroethylene ripple soft joint.
The utility model discloses a realize through following technical scheme:
the utility model provides a steel lining polytetrafluoroethylene ripple soft joint, includes stainless steel casing and polytetrafluoroethylene inside lining, its characterized in that: the stainless steel shell is a corrugated pipe body, a polytetrafluoroethylene lining is arranged in the corrugated pipe body and is formed by static pressure sintering, the polytetrafluoroethylene lining is bonded to the inner wall of the stainless steel shell through hot pressing, the polytetrafluoroethylene lining is attached to the inner wall of the corrugated pipe body of the stainless steel shell, and a high-temperature-resistant adhesive layer is arranged between the polytetrafluoroethylene lining and the inner wall of the stainless steel shell; the technical scheme is further explained as follows: the thickness of the polytetrafluoroethylene lining is 4-12 mm; the technical scheme is further explained as follows: the thickness of the adhesive layer is 0.2-0.3 mm; the technical scheme is further explained as follows: and flange sheets are welded at two ends of the stainless steel shell.
The utility model discloses following beneficial effect has:
the steel lining polytetrafluoroethylene soft joint has the characteristic of high temperature resistance in production pipeline systems of steel, chemical plants and the like, can resist the temperature of 220 ℃ under normal pressure or positive pressure, and can resist the vacuum degree of-0.09 MPaG at the temperature of 180 ℃. Under high temperature and high vacuum degree, the service life of the soft joint is 1.5 to 2 times longer than that of a common steel-lined polytetrafluoroethylene soft joint.
Drawings
FIG. 1 is a structural view of a steel-lined polytetrafluoroethylene corrugated soft joint;
FIG. 2 is a partial enlarged view of a steel-lined PTFE corrugated soft joint;
FIG. 3 is a diagram of a static pressure manufacturing structure of a PTFE tube;
FIG. 4 is a view showing the structure of a corrugation forming mold;
FIG. 5 is a top view of a corrugation forming die structure.
In the figure: the device comprises a connecting flange 1, a polytetrafluoroethylene lining 2, a stainless steel shell 3, a limiting pull rod 4, an outer mold 5, a polytetrafluoroethylene blank 6, a rubber mold sleeve 7, an inner mold core 8, a gland connecting bolt assembly 9, a mold gland 10, a corrugated forming mold right body 11, a corrugated forming mold bolt assembly 12 and a corrugated forming mold left body 13.
Detailed Description
The following structural drawings and embodiments further illustrate the present invention:
the drawing shows a steel lining polytetrafluoroethylene corrugated soft joint structure diagram and a polytetrafluoroethylene tube static pressure manufacturing mould diagram, and comprises a connecting flange 1, a polytetrafluoroethylene lining 2, a stainless steel shell 3, a limiting pull rod 4, an outer mould 5, a polytetrafluoroethylene blank 6, a rubber mould sleeve 7, an inner mould core 8, a gland connecting bolt assembly 9, a mould gland 10, a corrugated forming mould right body 11, a corrugated forming mould bolt assembly 12 and a corrugated forming mould left body 13. The steel lining polytetrafluoroethylene corrugated soft joint is formed by compounding a stainless steel shell and a polytetrafluoroethylene lining, the polytetrafluoroethylene lining is formed by thermoforming and pressing polytetrafluoroethylene pipes, the polytetrafluoroethylene pipes are made of imported or domestic high-quality die pressing polytetrafluoroethylene powder, and are formed by static pressure sintering, so that the polytetrafluoroethylene pipes are improvedThe compactness reaches 2.3g/cm 3 (ii) a The interior of the corrugated pipe stainless steel body is adhered to the outer surface of the polytetrafluoroethylene pipe by high-temperature-resistant strong glue, the adhesion strength is not separated under full vacuum, the polytetrafluoroethylene pipe stainless steel body is not degummed when the corrugated pipe stainless steel body is used at 180 ℃, and the polytetrafluoroethylene pipe stainless steel body is not separated from the corrugated pipe stainless steel body.
The specific process steps are as follows:
(1) The flexible joint uses a corrugated stainless steel body as an outer shell, the lining of the steel body is a thicker polytetrafluoroethylene corrugated pipe, the polytetrafluoroethylene pipe adopts a static pressure sintering forming technology, the thickness reaches 4-12 mm, and different polytetrafluoroethylene pipe wall thicknesses are selected according to different calibers.
(2) Pretreating the outer surface of the static pressure sintered polytetrafluoroethylene pipe, and machining the pipe to the thickness and the fixed length with a lathe, wherein the thickness and the fixed length are required; and then the outer surface of the polytetrafluoroethylene pipe is treated in a mechanical polishing mode, so that the outer surface of the polytetrafluoroethylene pipe meets certain roughness requirement.
(3) Simultaneously, flange sheets are welded at two ends of a stainless steel body pipe with a fixed size, the inner surface of the steel body is pretreated, chemical oil is removed, the inner part of the steel body and the sealing surface of the flange meet certain roughness requirements, the stainless steel body adopts a layer with the thickness of 0.3-5 mm, and different thicknesses are designed and selected according to process operation pressure.
(4) And carrying out sodium treatment on the outer surface of the polytetrafluoroethylene tube after pretreatment, removing fluorine from the outer surface of the polytetrafluoroethylene tube, wherein the purpose of removing fluorine from the outer surface of the polytetrafluoroethylene tube is to remove outer fluorine ions, and the outer surface of the polytetrafluoroethylene tube is changed into viscidity without affecting the corrosion resistance of the inner surface of the polytetrafluoroethylene tube. The polytetrafluoroethylene tube should be placed in a dark place after the outer surface of the polytetrafluoroethylene tube is subjected to sodium modification.
(5) Brushing high-temperature strong glue on the outer surface of the polytetrafluoroethylene tube subjected to sodium treatment, and brushing glue for three times respectively until the total thickness reaches about 0.2-0.3 mm; standing for a certain time to make the glue into a sticky state.
(6) Brushing high-temperature strong glue (selecting high-temperature-resistant strong glue) on the inner surface of the pretreated stainless steel body, and brushing glue for three times respectively until the total degree reaches about 0.2-0.3 mm; standing for a certain time to make the glue into a sticky state.
(7) And drawing the PTFE pipes brushed with the glue into a stainless steel body, paying attention to the extension length of the PTFE pipes at two ends, and ensuring the sealing size of the flange.
(8) And hot forming and flanging of the sealing surface: the stainless steel body pulled into the polytetrafluoroethylene pipe is placed on a rotatable support, the sealing surface of the polytetrafluoroethylene pipe is heated while rotating, the temperature is about 350 ℃, and the heat source adopts coal gas. Heating the flanging position of the polytetrafluoroethylene pipe to ensure that the polytetrafluoroethylene pipe is transparent, shaping the sealing surface of the polytetrafluoroethylene pipe by using a conical die (about 120 degrees and 180 degrees), and cooling and shaping. (9) The two ends of the flange are sealed by adopting the blind plates, one end of the flange is provided with the air inlet, air pressure (about 1.0 MPa) is added into the shell, and the pressure is maintained for a certain time, so that the polytetrafluoroethylene tube and the inner wall of the stainless steel body are more tightly adhered.
(10) And (3) corrugation forming: corrugating a stainless steel body and a polytetrafluoroethylene pipe together; manufacturing a corrugated forming steel mould (with the corrugated size and the wave number) according to the standard or design requirement; placing the tube with the well-glued sealing surface and the well-flanged edge in a forming die, sealing two ends of the tube with a high-pressure blind plate, and reserving a liquid inlet at one end of the tube; the oil used for pressurization is heated to 120 ℃. Pumping the heated oil into the corrugated pipe to be formed by a high-pressure oil pump, slowly increasing the pressure from low to high, slowly forming a stainless steel body and a polytetrafluoroethylene pipe according to the corrugated shape of a mold, maintaining the pressure for a certain time after the set pressure is reached, and cooling the oil temperature. The length of the soft joint is well controlled during the pressurizing process. And after the wave shape shaping is finished, discharging pumped oil from the other end, and finishing the wave shape shaping.
11 And mounting a limiting pull rod assembly.
The service life of the steel lining polytetrafluoroethylene corrugated soft joint is prolonged by 1.5 to 2 times compared with the service life of the existing steel lining polytetrafluoroethylene corrugated soft joint, and the vacuum resistance reaches-0.09 MPaG at the high temperature of 180 ℃.
The above disclosure of the preferred embodiments of the present invention is provided for better explaining the principle and practical application of the present invention, and many modifications and variations are possible in light of the above teaching and are within the scope of the appended claims.
Claims (4)
1. The utility model provides a steel lining polytetrafluoroethylene ripple soft joint, includes stainless steel casing and polytetrafluoroethylene inside lining, its characterized in that: the stainless steel shell is a corrugated pipe body, a polytetrafluoroethylene lining is arranged in the corrugated pipe body and is formed by static pressure sintering, the polytetrafluoroethylene lining is bonded on the inner wall of the stainless steel shell through hot pressing, the polytetrafluoroethylene lining is attached to the inner wall of the corrugated pipe body of the stainless steel shell, and a high-temperature-resistant adhesive layer is arranged between the polytetrafluoroethylene lining and the inner wall of the stainless steel shell.
2. The steel-lined polytetrafluoroethylene corrugated soft joint as set forth in claim 1, wherein: the thickness of the polytetrafluoroethylene lining is 4-12 mm.
3. The steel-lined polytetrafluoroethylene corrugated soft joint as set forth in claim 1, wherein: the thickness of the adhesive layer is 0.2-0.3 mm.
4. The steel-lined polytetrafluoroethylene corrugated soft joint as set forth in claim 1, wherein: and flange sheets are welded at two ends of the stainless steel shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221981956.0U CN218031883U (en) | 2022-07-29 | 2022-07-29 | Steel lining polytetrafluoroethylene corrugated soft joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221981956.0U CN218031883U (en) | 2022-07-29 | 2022-07-29 | Steel lining polytetrafluoroethylene corrugated soft joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218031883U true CN218031883U (en) | 2022-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221981956.0U Active CN218031883U (en) | 2022-07-29 | 2022-07-29 | Steel lining polytetrafluoroethylene corrugated soft joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218031883U (en) |
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2022
- 2022-07-29 CN CN202221981956.0U patent/CN218031883U/en active Active
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