CN102829270A - A method for connecting small diameter metal pipes - Google Patents

Abstract

The invention relates to a method for connecting small-caliber metal pipelines. The problem that the existing common connection mode in the prior art is high in cost and not easy to seal is mainly solved. The method is characterized in that: the end of one metal pipeline A (1) to be connected is made into a left-handed (or right-handed) external screw thread, the end of the other metal pipeline B (2) to be connected is made into a right-handed (or left-handed) external screw thread, the end face machining roughness of the two pipelines is required to be less than 1.6 mu m, two ends of a metal pipe hoop (3) are respectively provided with a left-handed internal thread and a right-handed internal thread, and the metal pipe hoop (3) is connected with the metal pipeline A (1) and the metal pipeline B (2) in a threaded connection mode. The method for connecting the small-caliber metal pipes has the advantages of good sealing performance, flexible disassembly and assembly, low cost and convenient connection, installation and adjustment.

Description

A method for connecting small diameter metal pipes

technical field

The invention relates to a pipe connection method, in particular to a small-diameter metal pipe connection method.

Background technique

At present, the detachable connection methods of metal pipelines include flange connection, screw connection, union connection, socket connection, and groove connection. Different connection methods have their own characteristics and scope of application. Among them, flange connection, screw connection The connection and union connection are more suitable for the connection of medium and high pressure small diameter pipelines. Screw connection has the characteristics of low cost, but it is not easy to seal; flange connection and union connection (divided into socket union and thread union) have the characteristics of convenient installation and maintenance, but the cost is relatively high.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the problems of high cost and difficult sealing of the existing common connection methods in the background technology, and provide a small-diameter metal pipe connection method, which has good sealing performance and Flexible disassembly and assembly, convenient connection, installation and adjustment, suitable for small-diameter metal pipe connections.

The present invention solves its problem and can reach through following technical scheme: a kind of small diameter metal pipe connection method, comprises two metal pipes A, metal pipe B that need to connect, and the end of a metal pipe A to be connected is made left-handed ( or right-handed) outer threaded buckle, the other metal pipe B end that needs to be connected is made of right-handed (or left-handed) outer threaded buckle. There are left and right internal threads, and the metal pipe clamp is connected with two metal pipes by threaded connection.

A gasket is added to the connection between the metal pipe A, metal pipe B and the metal pipe hoop; the material of the gasket is any one of iron, aluminum, copper, rubber, polytetrafluoroethylene, and plastic.

The end of the metal pipe A is chamfered and made into a left-handed (or right-handed) outer threaded button, and the end of the other metal pipe B that needs to be connected is made into a right-handed (or left-handed) outer threaded button. The roughness of the end surface of the metal pipe is required to be less than 1.6 μm, and the two ends of the metal pipe hoop are respectively provided with left and right internal threads, and the metal pipe hoop is connected to the two metal pipes by thread connection.

The end of the metal pipe A to be connected is welded with a short wire A, and the short wire A is chamfered and made into a right-handed (or left-handed) outer threaded buckle, and the end of the other metal pipe B to be connected is A short wire B is welded at the head, and the short wire B is made into a left-handed (or right-handed) outer threaded buckle. The end surface roughness of the two short wires is required to be less than 1.6 μm. Both ends of the metal pipe ferrule have left-handed internal threads respectively. The threaded connection connects the metal pipe ferrule with two short wires.

The end chamfering range of the metal pipe A and the short wire A is 20-80°.

Compared with the above-mentioned background technology, the present invention can have the following beneficial effects: the small-diameter metal pipe connection method adopts the above-mentioned connection method, connects through the positive and negative clamps, and rotates the positive and negative clamps, so that the pipeline can be easily assembled and disassembled , Compared with flange, union connection and clamp connection, it has low cost, good sealing performance, simple operation and strong practicability, and is suitable for high-pressure small-diameter metal pipe connection methods.

Description of drawings:

Accompanying drawing 1 is the connection structure schematic diagram of the present invention;

Accompanying drawing 2 is the connection structure schematic diagram of another embodiment of the present invention;

Accompanying drawing 3 is the connection structure schematic diagram of the third embodiment of the present invention;

Accompanying drawing 4 is the structural representation of the chamfered staple A of the present invention;

Accompanying drawing 5 is the enlarged schematic diagram of the structure of part I in accompanying drawing 4.

In the figure: 1-metal pipe A, 2-metal pipe B, 3-metal pipe hoop, 4-short wire A, 5-short wire B, 6-sealing pad.

Specific implementation methods :

The present invention will be further described below in conjunction with specific embodiment:

Example 1

As shown in Figure 2, a small-diameter metal pipe connection method includes two metal pipes A1 and B2 to be connected. The end of a metal pipe A1 to be connected is made of a left-handed external thread. The end of the other metal pipe B2 is made of a right-handed external thread. The roughness of the end surface of the two pipes is required to be less than 1.6 μm. 3. Connect with metal pipe A1 and metal pipe B2. Gaskets are added to the joints of the metal pipe A1, the metal pipe B2 and the metal pipe collar 3. The material of the gasket is polytetrafluoroethylene.

Example 2

As shown in Figure 2, a small-diameter metal pipe connection method includes two metal pipes A1 and B2 that need to be connected. The other end of the metal pipe B2 is made of a left-handed external screw thread. The roughness of the end surface of the two pipes is required to be less than 1.6 μm. The two ends of the metal pipe clamp 3 have left-handed internal threads respectively. 3. Connect with metal pipe A1 and metal pipe B2. A gasket is added to the connection between the metal pipe A1, the metal pipe B2 and the metal pipe collar 3, and the material of the gasket is iron.

Example 3

As shown in Figure 1, the end of the metal pipe A1 is chamfered and then made into a left-handed outer thread, and the end of the other metal pipe B2 to be connected is made into a right-handed outer thread. The roughness of the end surface processing is required to be less than 1.6 μm. The two ends of the metal pipe clamp 3 are respectively provided with left and right internal threads. The metal pipe clamp 3 is connected with the metal pipe A1 and the metal pipe B2 by thread connection; the chamfer of the metal pipe A is 45 °. As the pipe clamp is tightened, the chamfered end face is squeezed and deformed to achieve the purpose of sealing.

Example 4

As shown in Figure 1, the end of the metal pipe A1 is chamfered and made into a right-handed outer threaded thread, and the end of the other metal pipe B2 that needs to be connected is made into a left-handed outer threaded thread. The roughness of the end surface processing is required to be less than 1.6 μm. The two ends of the metal pipe clamp 3 are respectively provided with left and right internal threads. The metal pipe clamp 3 is connected with the metal pipe A1 and the metal pipe B2 by thread connection. The chamfer of the metal pipe A is 45 °. As the pipe clamp is tightened, the chamfered end face is squeezed and deformed to achieve the purpose of sealing.

Example 5

As shown in Fig. 3 and Fig. 4 and Fig. 5, the end of the metal pipe A1 is welded with a short wire A4, and the short wire A4 is chamfered and made into a right-handed outer screw thread, and the end of the metal pipe B2 is A short wire B5 is welded to the head, and the short wire B5 is made into a left-handed external thread. The roughness of the end surface processing of the two short wires is required to be less than 1.6 μm. The two ends of the metal pipe clamp 3 are respectively provided with left-handed internal threads. The metal pipe clamp 3 is connected with the short wire A4 and the short wire B5; the chamfer of the short wire A4 is 45°. As the pipe clamp is tightened, the chamfered end face is squeezed and deformed to achieve the purpose of sealing.

Example 6

As shown in Figure 3 and Figure 4 and Figure 5, the end of the metal pipe A1 is welded with a short wire A4, and the short wire A4 is chamfered and made into a left-handed outer threaded button, the end of the metal pipe B2 A short wire B5 is welded, and the short wire B5 is made into a right-handed external thread. The roughness of the end surface of the two short wires is required to be less than 1.6 μm. The two ends of the metal pipe clamp 3 are respectively provided with left-handed internal threads. The metal pipe clamp 3 is connected with the short wire A4 and the short wire B5; the chamfer of the short wire A4 is 45°. As the pipe clamp is tightened, the chamfered end face is squeezed and deformed to achieve the purpose of sealing.

In the above-mentioned embodiments 1-6, the connected metal pipelines are DN25 and DN50 pipelines, and the hydraulic pressure test reaches 40MPa without leakage.

Claims (6)

1. A small-diameter metal pipe connection method, including two metal pipes A (1) and metal pipes B (2) to be connected, characterized in that: the end of a metal pipe A (1) to be connected is made of For left-handed (or right-handed) outer threaded fasteners, the end of another metal pipe B (2) to be connected is made of right-handed (or left-handed) outer threaded fasteners. The roughness of the end faces of the two pipes is required to be less than 1.6 μm. Metal pipes Both ends of the hoop (3) are respectively provided with left and right internal threads, and the metal pipe hoop (3) is connected with the metal pipe A (1) and the metal pipe B (2) by thread connection. 2. A small-diameter metal pipe connection method according to claim 1, characterized in that: the joints of the metal pipe A (1), metal pipe B (2) and the metal pipe collar (3) are sealed with gaskets (6). 3. The method for connecting small-diameter metal pipes according to claim 2, characterized in that: the material of the gasket (6) is any one of iron, aluminum, copper, rubber, polytetrafluoroethylene, and plastic. 4. A small-diameter metal pipe connection method according to claim 1, characterized in that: the end of the metal pipe A (1) is chamfered and then made into a left-handed (or right-handed) outer threaded buckle , the end of another metal pipe B (2) that needs to be connected is made of a right-handed (or left-handed) outer screw thread, the end surface roughness of the two pipes is required to be less than 1.6 μm, and the two ends of the metal pipe collar (3) are respectively equipped with Turn the internal thread left and right, and connect the metal pipe clamp (3) with the metal pipe A (1) and the metal pipe B (2) by thread connection. 5. A small-diameter metal pipe connection method according to claim 1, characterized in that: the end of the metal pipe A (1) is welded with a short wire A (4), and the short wire A (4) passes through Chamfering and making a right-handed (or left-handed) outer threaded buckle, the end of the metal pipe B (2) is welded with a short wire B (5), and the short wire B (5) is made into a left-handed (or right-handed) For external threaded fasteners, the roughness of the end surface processing of the two short wires is required to be less than 1.6 μm, and the two ends of the metal pipe ferrule (3) are respectively provided with left and right internal threads, and the metal pipe ferrule (3) and the short wire A ( 4), the short wire B (5) is connected. 6. A small-diameter metal pipe connection method according to claim 4 or 5, characterized in that: the chamfering range of the ends of the metal pipe A (1) and the short wire A (4) is 20-80 °.

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