A kind of naphthalene polytetrafluoroethylene steel lined elbow

Abstract

The utility model relates to the technical field of elbows, in particular to a naphthalene-treated polytetrafluoroethylene steel-lined elbow, wherein the outer wall of the polytetrafluoroethylene elbow is treated by a naphthalene-treated process to form a naphthalene-treated layer, and then a metal pipe is sleeved on the outer side of the polytetrafluoroethylene elbow, and the metal pipe and the polytetrafluoroethylene elbow are heated and inflated and bonded by a first glue layer and a second glue layer to improve bonding firmness; the utility model comprises a metal pipe, a first glue layer, a naphthalene-treated layer, a polytetrafluoroethylene elbow and a second glue layer, the inner wall of the metal pipe is coated with the first glue layer, and is characterized in that a naphthalene-treated layer is provided on the outer wall of the polytetrafluoroethylene elbow, a naphthalene-treated layer is provided on the outer side of the naphthalene-treated layer, a second glue layer is provided on the outer side of the naphthalene-treated layer, the polytetrafluoroethylene elbow is bonded on the inner side of the metal pipe by the first glue layer and the second glue layer, and the outer diameter of the polytetrafluoroethylene elbow is smaller than the inner diameter of the metal pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of elbows, in particular to a naphthalene-based polytetrafluoroethylene steel-lined elbow. Background Art

[0002] Polytetrafluoroethylene plastic elbow, also known as PTFE elbow, is a high-performance pipe fitting widely used in chemical, pharmaceutical, food, electronics, aerospace and other fields. Polytetrafluoroethylene plastic elbow cannot be bonded with rubber, metal and other materials.

[0003] Since the polytetrafluoroethylene molecules are tightly surrounded by negative atoms in the outer layer, their outer surface has high stability and non-stickiness. If the outer side of the polytetrafluoroethylene plastic elbow is pasted to the steel-lined elbow with an adhesive, the firmness of the paste is poor. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a naphthalened polytetrafluoroethylene steel lining elbow with improved adhesion firmness.

[0005] The utility model discloses a naphthalene-treated polytetrafluoroethylene steel-lined elbow, comprising a metal pipe (1), a first glue layer (2), a naphthalene sodium treatment layer (3), a polytetrafluoroethylene elbow (4) and a second glue layer (5), wherein the inner wall of the metal pipe (1) is coated with the first glue layer (2), the outer wall of the polytetrafluoroethylene elbow (4) is provided with a naphthalene sodium treatment layer (3), the outer side of the naphthalene sodium treatment layer (3) is provided with a second glue layer (5), the polytetrafluoroethylene elbow (4) is on the inner side of the metal pipe (1) and is bonded by the first glue layer (2) and the second glue layer (5), and the outer diameter of the polytetrafluoroethylene elbow (4) is smaller than the inner diameter of the metal pipe (1); the outer wall of the polytetrafluoroethylene elbow is treated by a naphthalene-treated process to form a naphthalene sodium treatment layer, and then the metal pipe is sleeved on the outer side of the polytetrafluoroethylene elbow, and the metal pipe and the polytetrafluoroethylene elbow are bonded by the first glue layer and the second glue layer to improve the bonding firmness.

[0006] Preferably, the glue is a high temperature resistant epoxy glue; the high temperature resistant epoxy glue can maintain its mechanical properties and chemical stability for a long time in a high temperature environment.

[0007] Compared with the prior art, the utility model has the following beneficial effects: the outer wall of the polytetrafluoroethylene elbow is treated by a naphthalene-naphthalene treatment process to form a naphthalene-naphthalene treatment layer, and then the metal tube is sleeved on the outer side of the polytetrafluoroethylene elbow, and the metal tube and the polytetrafluoroethylene elbow are bonded by a first glue layer and a second glue layer to improve the bonding firmness. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0009] Figure 2 yes Figure 1 A partial enlarged structural diagram of the middle part;

[0010] Markings in the attached drawings: 1. metal tube; 2. first glue layer; 3. sodium naphthalene treatment layer; 4. polytetrafluoroethylene elbow; 5. second glue layer. DETAILED DESCRIPTION

[0011] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0012] Example 1

[0013] like Figure 1 to Figure 2 As shown, the utility model is a naphthalene sodium treated polytetrafluoroethylene steel lined elbow, comprising a metal tube (1), a first glue layer (2), a naphthalene sodium treated layer (3), a polytetrafluoroethylene elbow (4) and a second glue layer (5), the inner side wall of the metal tube (1) is coated with the first glue layer (2), the outer side wall of the polytetrafluoroethylene elbow (4) is provided with a naphthalene sodium treated layer (3), the outer side of the naphthalene sodium treated layer (3) is provided with a second glue layer (5), the polytetrafluoroethylene elbow (4) is on the inner side of the metal tube (1) and is bonded by the first glue layer (2) and the second glue layer (5), and the outer diameter of the polytetrafluoroethylene elbow (4) is smaller than the inner diameter of the metal tube (1);

[0014] The first glue layer 2 and the second glue layer 5 are both high temperature resistant epoxy glue.

[0015] In this embodiment, the outer wall of the polytetrafluoroethylene elbow 4 is treated by a naphthalene treatment process to form a naphthalene treatment layer 3, and then the metal tube 1 is put on the outside of the polytetrafluoroethylene elbow 4. The metal tube 1 and the polytetrafluoroethylene elbow 4 are bonded by a first glue layer 2 and a second glue layer 5. The high-temperature resistant epoxy glue can maintain its mechanical properties and chemical stability for a long time in a high-temperature environment.

[0016] The production steps of the utility model are:

[0017] 1. After sandblasting and rust removal, apply a thin first glue layer 2 on the inner wall of the metal pipe 1;

[0018] 2. The polytetrafluoroethylene elbow 4 is subjected to a naphthalene sodium treatment, and a naphthalene sodium treatment layer 3 is formed on the surface of the polytetrafluoroethylene elbow 4. A thin second glue layer 5 is applied on the outer side of the naphthalene sodium treatment layer 3.

[0019] 3. Install the dried polytetrafluoroethylene elbow 4 into the metal tube 1;

[0020] Fourth, the synthesized polytetrafluoroethylene elbow 4 and the metal tube 1 are placed in an oven for heating;

[0021] 5. Take out the heated polytetrafluoroethylene elbow 4 and metal tube 1, put the high temperature resistant expansion airbag into the heated polytetrafluoroethylene elbow 4 and inflate it, so that the polytetrafluoroethylene elbow 4 and metal tube 1 fit closely and firmly bond together;

[0022] 6. Take out the expansion airbag and flatten the protruding polytetrafluoroethylene elbow 4 along the flange surface.

[0023] The utility model discloses a naphthalene-based polytetrafluoroethylene steel-lined elbow. Flanges are provided at both ends of the metal pipe respectively. The outer diameter of the polytetrafluoroethylene elbow 4 is slightly smaller than the inner diameter of the metal pipe 1. The metal pipe 1 and the polytetrafluoroethylene elbow 4 are purchased on the market. The technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for the technicians in the field to make creative labor.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A naphthalene-treated polytetrafluoroethylene steel-lined elbow, comprising a metal tube (1), a first glue layer (2), a naphthalene-treated layer (3), a polytetrafluoroethylene elbow (4) and a second glue layer (5), wherein the inner side wall of the metal tube (1) is coated with the first glue layer (2), characterized in that: The outer wall of the polytetrafluoroethylene elbow (4) is provided with a sodium naphthalene treatment layer (3), and the outer side of the sodium naphthalene treatment layer (3) is provided with a second glue layer (5). The polytetrafluoroethylene elbow (4) is bonded to the inner side of the metal tube (1) through the first glue layer (2) and the second glue layer (5), and the outer diameter of the polytetrafluoroethylene elbow (4) is smaller than the inner diameter of the metal tube (1).

2. A naphthalene-treated polytetrafluoroethylene steel-lined elbow as claimed in claim 1, characterized in that: The first glue layer (2) and the second glue layer (5) are both high temperature resistant epoxy glue.

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