CN106287046A - A kind of highly pressurised liquid two way seal pipe joint - Google Patents

Abstract

The invention relates to a high-pressure liquid two-way sealed pipeline joint, which is used for sealing pipeline connections. The pipe joint is mainly composed of a joint body, a piston ring and a sealing ring; the joint body is a symmetrical structure, with threads connected to the pipeline at both ends, and two annular working cavities are symmetrically arranged in the middle, and the circumference of the inner wall of the joint is Evenly distribute several liquid inlet passages in the direction, and ensure that each inlet passage communicates with two symmetrical annular working chambers at the same time; the piston ring is symmetrically assembled in the two annular working chambers of the joint body, and one end of its section It is arc-shaped; the sealing ring is installed symmetrically at both ends of the annular working cavity, and one side of the arc surface of the sealing ring is kept in contact with one side of the arc end surface of the piston ring. The pipe joint structure proposed by the invention is beneficial to reduce the leakage of the pipe under high pressure and improve the reliability of the pipe connection at the same time.

Description

A high-pressure liquid two-way sealed pipe joint

technical field

The invention relates to the technical field of sealed pipeline connections, in particular to a high-pressure liquid two-way sealed pipeline joint.

Background technique

According to different uses, pipelines can be divided into petroleum pipelines, hydraulic pipelines and tap water pipelines. When installing and laying out pipelines, it is necessary to connect pipelines of different lengths. At present, pipe joints are the most widely used components in pipeline connection technology.

There are various forms of pipe joints, and the most commonly used ones are flange and threaded connections. Whether it is a flange connection or a threaded connection, the purpose is to increase the pre-tightening force of the end-to-seal ring to achieve pipe sealing. Because the flange bolts and connecting threads are subjected to high stress for a long time, the sealing ring only works under the initial pre-tightening force, and there is no continuous compensation force to maintain the sealing state, resulting in easy loosening of the pipe joints, so the current pipe Joints generally have leakage problems, especially in high-pressure environments. Moreover, the sealing of pipe joints mostly adopts the form of one-way sealing, that is, the two pipes are sealed only by the connecting end face, which will increase the frequency of leakage. At present, there are few forms of sealing the two pipes separately.

Contents of the invention

The purpose of the present invention is to solve the problems in the above-mentioned technologies, and propose a high-pressure liquid two-way sealed pipeline joint, which uses the cavity in the joint body, a specific channel and a floating piston ring to realize continuous compensation for the extrusion force of the sealing ring. Symmetrical sealing ring structure to reduce the leakage of pipeline connections.

In order to achieve the above object, it can be achieved through the following technical solutions, which are described as follows in conjunction with the accompanying drawings:

A high-pressure liquid two-way sealed pipe joint, mainly composed of a joint body (3), a piston ring (2) and a sealing ring (4), the joint body (3) is a symmetrical structure, and its two ends have a ) connecting threads (b), two annular working chambers (c) are symmetrically arranged in the middle, several liquid inlet channels (a) are evenly distributed on the inner wall of the joint body (3) in the circumferential direction, and each inlet channel (a) is guaranteed At the same time, it communicates with two symmetrical annular working chambers (c); the piston ring (2) is symmetrically assembled in the two annular working chambers (c) of the joint body (3). The cavity (c) slides axially, and one end of its cross-section is arc-shaped; the sealing ring (4) is symmetrically installed at both ends of the annular working cavity (c), and one side of the arc surface of the sealing ring (4) Keep in contact with one side of the arc end face of the piston ring (2).

At low pressure, the vertical end surface of the piston ring (2) is in contact with the shaft shoulder of the joint body (3) under the axial extrusion force of the sealing ring (4) and the pipe (1); at high pressure, the piston ring (2) Under the action of liquid pressure, the ring (2) has its circular arc end face to squeeze the sealing ring (4) outward.

The number of the liquid inlet channels (a) is generally 6-10.

The present invention proposes a high-pressure liquid two-way sealed pipe joint, which has the following advantages:

Automatically improves the sealing performance of connecting pipes. When the liquid pressure in the pipeline is not high, the invention relies on the end surface of the pipeline and the sealing ring with an arc-shaped cross section to squeeze the piston ring to the axial shoulder of the joint body to realize the initial pre-tightening sealing force. When the liquid in the pipeline is under high pressure, the liquid enters the working chamber of the piston ring through the inlet passage in the joint body, and the high-pressure liquid acts on one side of the piston ring, causing the piston ring to squeeze against the sealing ring, so as to achieve the purpose of continuously compensating the sealing pressure, and The compensation pressure will increase with the increase of the liquid pressure to achieve the purpose of automatically improving the sealing performance of the pipeline.

The symmetrical sealing structure can improve the reliability of the pipeline connection. The pipe joint of the present invention is designed as a symmetrical sealing structure, so that the end faces of the two pipes maintain a high-pressure sealing state at the same time, which can improve the ability of the pipe to resist shock and vibration, thereby achieving the purpose of improving the reliability of the pipe seal.

Description of drawings

Fig. 1 is a schematic diagram of the assembly of the pipe joint of the present invention.

Fig. 2 is a schematic diagram of the pipe joint body of the present invention.

Fig. 3 is a sectional view of the working principle of the pipe joint of the present invention.

Fig. 4 is a schematic diagram of the piston ring 2 of the present invention.

In the attached drawings 1. Pipeline; 2. Piston ring; 3. Joint body; 4. Sealing ring;

a. Liquid inlet channel; b. Connecting thread; c. Piston ring working cavity.

detailed description

The specific content and implementation of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, a high-pressure liquid two-way sealed pipeline joint is mainly composed of a joint body (3), a piston ring (2) and a sealing ring (4), and the joint body (3) is a symmetrical structure. There are threads (b) connected to the pipe (1) at both ends, two annular working cavities (c) are symmetrically arranged in the middle, several liquid inlet channels (a) are evenly distributed on the inner wall of the joint body (3) in the circumferential direction, and Ensure that each inlet channel (a) communicates with two symmetrical annular working chambers (c) at the same time; the piston ring (2) is symmetrically assembled in the two annular working chambers (c) of the joint body (3) , when the pipeline is connected, it can slide axially in the working cavity (c), and one end of its section is arc-shaped; the sealing ring (4) is symmetrically installed at both ends of the annular working cavity (c), and the sealing ring (4) One side of the arc surface is kept in contact with one side of the arc end face of the piston ring (2).

At low pressure, the vertical end surface of the piston ring (2) is in contact with the shaft shoulder of the joint body (3) under the axial extrusion force of the sealing ring (4) and the pipe (1); at high pressure, the piston ring (2) Under the action of liquid pressure, the ring (2) presses the sealing ring (4) outward with its circular arc end face.

In order to ensure that the joint body (3) has sufficient strength and facilitate the smooth entry of high-pressure liquid into the piston ring working cavity (c), the number of the liquid inlet channels (a) is generally 6-10.

As shown in Figures 3 and 4, when the liquid pressure in the pipeline (1) is low, the present invention relies on the end face of the pipeline (1) and the sealing ring (4) to squeeze the piston ring (2) to the shaft of the joint body (3). To the shoulder, the initial pre-tightening sealing force is realized, and the sealing state is the same as that of ordinary flange and threaded connection. When the liquid in the pipe (1) is under high pressure, the liquid enters the piston ring working chamber (c) through the inlet channel (a) in the joint body (3), and the high-pressure liquid acts on the side of the piston ring (2), making The piston ring (2) squeezes the sealing ring (4) to achieve the purpose of continuously compensating the sealing pressure, and the compensation pressure will increase with the increase of the liquid pressure to achieve the purpose of automatically improving the sealing performance of the pipeline. The pipe joint of the present invention is designed as a symmetrical sealing structure, so that the end faces of the two pipes (1) maintain a high-pressure sealing state at the same time, which can improve the ability of the pipes (1) to resist shock and vibration, thereby achieving the purpose of improving sealing reliability.

The structure of the present invention can also be used for sealing end caps, and the symmetrically arranged sealing passages in the joint body can be designed as a one-way sealing structure, which can reduce the leakage of the sealing end caps.

The above-described embodiments are only used to illustrate the present invention, wherein the structure of each component, connection mode, etc. all can be changed, and all equivalent transformations and improvements carried out on the basis of the technical solution of the present invention should not be excluded from the scope of the present invention. outside the scope of protection.

Claims (3)

1. A high-pressure liquid two-way sealed pipe joint, mainly composed of a joint body (3), a piston ring (2) and a sealing ring (4), characterized in that: the joint body (3) is a symmetrical structure, and its two There is a thread (b) connected to the pipe (1) at the end, two annular working chambers (c) are symmetrically arranged in the middle, and several liquid inlet channels (a) are evenly distributed on the inner wall of the joint body (3) in the circumferential direction, and each The two inlet passages (a) communicate with two symmetrical annular working chambers (c) at the same time; the piston ring (2) is symmetrically assembled in the two annular working chambers (c) of the joint body (3), and the pipe When connecting, it can slide axially in the working cavity (c), and one end of its section is arc-shaped; the sealing ring (4) is symmetrically installed at both ends of the annular working cavity (c), and the sealing ring (4 ) one side of the arc surface is kept in contact with one side of the piston ring (2) arc end face. 2. A high-pressure liquid two-way sealed pipeline joint according to claim 1, characterized in that: at low pressure, the piston ring (2) acts on the axial extrusion force of the sealing ring (4) and the pipeline (1) Down, its vertical end surface is in contact with the shaft shoulder of the joint body (3); under high pressure, the circular arc end surface of the piston ring (2) squeezes the sealing ring (4) outward under the action of liquid pressure. 3. A high-pressure liquid two-way sealed pipe joint according to claim 1, characterized in that: the number of said liquid inlet channels (a) is generally 6-10.