CN114294488A - A sealed joint with adjustable axial length - Google Patents

Abstract

The invention belongs to the technical field of pipe joints, and discloses a sealing joint with adjustable axial length, which comprises a first joint, a second joint and a limiting piece, wherein the first joint is fixedly connected with the second joint; a butting part is arranged in the first joint, and a limiting part is arranged at one end of the first joint, which is far away from the butting part; a flange part is arranged outside the second joint; the flange part of the second joint is inserted into the first joint and is limited by the axial movement of the abutting part, and the flange part is limited between the abutting part and the limiting part and can move axially between the abutting part and the limiting part; the flange part is provided with an annular groove, a sealing element is arranged in the annular groove, and the sealing element fills a gap between the first joint and the second joint; the inner peripheral wall of the first joint is annularly provided with a groove part, and the groove part is opposite to the outer peripheral wall of the second joint and mutually matched to form labyrinth seal. The joint has the advantages of adjustable length, good sealing performance, capability of compensating pipeline interval change caused by expansion with heat and contraction with cold and the like, convenient and flexible use, simple structure and low production cost.

Description

A sealed joint with adjustable axial length

technical field

The invention belongs to the technical field of pipe joints, in particular to a sealing joint with adjustable axial length.

Background technique

Pipe joint is a component used to connect pipelines; in higher pressure pipeline systems, the commonly used pipe joints are metal pipe joints, and the metal materials are usually stainless steel, aluminum alloy, carbon steel and other materials.

At present, in the technical field of metal pipe joints, the commonly used metal pipe joints include metal hard pipe joints and metal hose joints. The metal hard pipe joint is a rigid pipe joint, and its length is generally fixed. During the pipeline process, if the distance between the pipelines is too large, the metal hard pipe joint may not be installed in the pipeline.

The metal hose joint is a kind of flexible pipe joint. Its inner layer is generally made of a corrugated pipe with a spiral or annular shape. It is relatively smooth. Under the same inner diameter of the pipeline, the flow capacity of the pipeline medium connected to the metal hose joint is significantly lower than that of the pipeline medium connected to the metal hard pipe joint, so the application effect of the metal hard pipe joint is better. However, it is necessary to solve the problem of adaptability of metal hard pipe joints to the spacing between pipes, and there are some published patents.

For example, the Chinese utility model patent with publication number CN211779500U discloses a highly adaptable pipeline connector structure, including a plug-in pipe, an adjustment ring, an adjustment piece, a seal, a pipeline ring and a connecting piece. The socket is inserted and matched, the socket is passed through the adjusting ring, the two adjusting rings are symmetrically arranged on both sides of the socket, and the adjusting piece is connected between the two adjusting rings. The two adjusting rings can be made close to each other or away from each other with respect to the plug-in tube, the seal is connected at the plug-fit place between the adjustment ring and the plug-in tube, and the seal is used for the gap between the plug-fit between the adjustment ring and the plug-in tube. play a sealing role. It can be seen that the pipe connector of this patent can adapt to the distance error between the pipes to be connected. However, the structure is complex and the production cost is high, which is not conducive to comprehensive promotion.

In addition, after the joint is installed in the pipeline system, the distance between the pipes will change due to the thermal expansion and contraction of the pipeline; and the existing joint with adjustable length structure is limited by the installation of the pipeline system in the pipeline system. Due to the limitation of the structure of the joint itself, it is difficult to adjust the length again. When the distance between the pipes changes due to thermal expansion and contraction in the pipeline system, it is difficult to compensate for the change in the distance between the pipes, and joints appear. damage or fluid leakage, etc.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the prior art, the present invention proposes a sealed joint with an adjustable axial length, which can adapt to the installation position and the distance between the pipelines, and can also compensate for changes in the pipeline distance caused by thermal expansion and cold contraction. , It is convenient for pipeline connection and installation, which is conducive to ensuring the sealing effect and reducing the stress in the pipeline system.

The present invention is achieved through the following technical solutions:

A sealed joint with adjustable axial length, comprising a first joint, a second joint and a limiter;

An abutting portion is arranged in the first joint, and a limiting member is arranged at one end of the first joint away from the abutting portion;

The outer side of the second joint is provided with a flange portion;

The flange portion of the second joint is inserted into the first joint and is restricted by the axial movement of the abutting portion. The flange portion is restricted between the abutting portion and the limiting member, and can be positioned between the abutting portion and the limiting member. Axial movement between;

The flange part is provided with an annular groove, and the annular groove is provided with a seal, and the seal fills the gap between the first joint and the second joint;

The inner peripheral wall of the first joint is annularly provided with a groove portion, and the groove portion is opposite to the outer peripheral wall of the second joint and cooperates with each other to form a labyrinth seal.

It can be seen that the second joint is restricted between the abutting portion and the limiting member through the flange portion, and the second joint can move in the axial direction relative to the first joint, so that the axial length of the joint can be adjusted, and can be used with The distance between the joint and the pipeline with a fixed length of compensation. In addition, the length of the joint can be adjusted by directly pulling the second joint, which is convenient and flexible to use. In addition, the joint has a simple structure, low production cost, and is easy to be popularized.

The arrangement of the labyrinth seal improves the sealing reliability and does not lose too much movability of the first joint and the second joint; the seal is arranged in the downstream position of the labyrinth seal in terms of the direction in which the fluid medium flows in the joint gap , the seal will seal and block the leaking fluid medium in the labyrinth seal; the two enhance the sealing reliability of the joint and better meet the sealing requirements for conveying high-pressure medium.

Preferably, the groove portion includes a plurality of annular grooves arranged in parallel, and the plurality of annular grooves arranged in parallel cooperate with the outer peripheral wall of the second joint to form a labyrinth seal.

Preferably, the sealing member adopts a sealing ring.

Preferably, the limiting member adopts a limiting nut, and the limiting nut is threadedly connected with the first joint.

Preferably, the limit nut is made of a pressure-resistant metal material.

Preferably, a locking piece is fixed on the first joint, the locking piece penetrates the pipe wall of the first joint, and the bottom of the locking piece can abut with the flange part or be partially inserted into the flange part, so as to realize the first joint and the second joint The relative fixation between them enhances the reliability of the metal piping system.

Preferably, the locking member adopts a locking screw threadedly connected with the pipe wall of the first joint.

Preferably, both the first joint and the second joint are made of pressure-resistant metal materials.

The beneficial effects of the present invention are:

Through the flange portion, the second joint is restricted between the abutting portion and the limiting member, and the second joint can move in the axial direction relative to the first joint, so that the axial length of the joint can be adjusted, which can be used for compensation The distance between the fixed length joint and the pipe.

The length of the joint can be adjusted by directly pulling the second joint, the use is convenient and flexible, the joint structure is simple, the production cost is low, and it is easy to be better popularized.

The inner peripheral wall of the first joint is annularly provided with a groove portion, and the groove portion is opposite to the outer peripheral wall of the second joint, and cooperates with each other to form a labyrinth seal, which improves the sealing reliability and does not cause excessive loss of the first joint and the second joint. Removability of joints.

In terms of the flow direction of the fluid medium in the joint gap, the seal is arranged at the downstream position of the labyrinth seal, and the seal will seal and block the fluid medium leaking from the labyrinth seal; the combined sealing form of the labyrinth seal and the seal enhances the The sealing reliability of the joint can better meet the sealing requirements for conveying high-pressure media.

Through the relative movement between the first joint and the second joint, the change of the pipeline spacing caused by the phenomenon of thermal expansion and cold contraction can be compensated, and the joint damage or fluid leakage can be avoided.

The relative fixation between the first joint and the second joint is achieved by locking screws, thereby enhancing the reliability of the metal piping system.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of the internal structure of a sealing joint with an adjustable axial length according to Embodiment 1;

2 is an external axonometric view of a sealing joint with an adjustable axial length according to Embodiment 1;

3 is a schematic diagram of an internal flow path of a sealing joint with an adjustable axial length according to Embodiment 1;

4 is a schematic diagram of the internal structure of a sealing joint with an adjustable axial length according to Embodiment 2;

In the figure: 1, the first joint, 2, the second joint, 3, the limiter, 4, the seal, 11, the abutting part, 12, the groove part, 22, the flange part, 23, the annular groove, 5. Locking parts, 6. Fluid medium.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Example 1:

Referring to FIGS. 1-3 , this embodiment provides a sealing joint with adjustable axial length, including a first joint 1 , a second joint 2 , and a limiting member 3 ;

An abutting portion 11 is provided in the first joint 1, and a limiting member 3 is arranged at one end of the first joint 1 away from the abutting portion 11;

The outer side of the second joint 2 is provided with a flange portion 22;

The flange portion 22 of the second joint 2 is inserted into the first joint 1 and is restricted by the axial movement of the abutting portion 11 . The flange portion 22 is restricted between the abutting portion 11 and the limiting member 3 and can be The axial movement between the abutting portion 11 and the limiting member 3 means that the axial linear distance between the limiting member 3 and the abutting portion 11 of the first joint 1 is greater than the axial length distance of the flange portion 22 itself.

The flange portion 22 is provided with an annular groove, and a sealing member 4 is arranged in the annular groove, and the sealing member 4 fills the gap between the first joint 1 and the second joint 2;

The inner peripheral wall of the first joint 1 is annularly provided with a groove portion 12, and the groove portion 12 is opposite to the outer peripheral wall of the second joint 2 and cooperates with each other to form a labyrinth seal.

In this embodiment, the second joint 2 is restricted between the abutting portion 11 and the limiting member 3 through the flange portion 22 , and the second joint 2 can move relative to the first joint 1 in the axial direction, thereby realizing the shaft of the joint. The length is adjustable, which can be used to compensate for the existing distance between the joint and the pipeline with a fixed length. Moreover, the adjustment of the length of the joint can be realized by directly pulling the second joint 2, the use is convenient and flexible, the joint structure is simple, the production cost is low, and it is easy to be popularized better.

In this embodiment, the limiting member 3 adopts a limiting nut, and the limiting nut is threadedly connected with the first joint 1 .

In this embodiment, an annular groove 23 is provided in the flange portion 22, the annular groove 23 is arranged in the middle area of the flange portion 22, and a sealing member 4 is arranged in the annular groove 23, and the sealing member 4 is connected by the first joint 1 and the second joint 2 are pressed tightly to fill the gap between the first joint 1 and the second joint 2. In this embodiment, the sealing member 4 adopts a sealing ring. When the fluid medium 6 is transported in the first joint 1 and the second joint 2, the fluid medium 6 will be blocked by the seal 4, making it difficult for the fluid medium 6 transported in the first joint 1 and the second joint 2 to flow out of the joint leakage.

When the fluid medium 6 conveyed in the first joint 1 and the second joint 2 is a high-pressure medium, it is difficult for a single form of seal 4 to completely seal and block the fluid medium 6 in the joint, and there may be a small amount of fluid medium 6 completely passing through the seal 4. There is leakage to the outside of the joint. In order to avoid the leakage of the fluid medium 6 to the outside of the joint, the present invention is provided with a groove portion 12 on the inner peripheral wall of the first joint 1. The groove portion 12 is opposite to the outer peripheral wall of the second joint 2 and cooperates with each other to form Labyrinth seal. In this embodiment, the groove portion 12 includes a plurality of annular grooves arranged in parallel, and the plurality of annular grooves arranged in parallel cooperate with the outer peripheral wall of the second joint 2 to form a labyrinth seal, and the fluid in the labyrinth seal is passed through. It is difficult for the medium 6 to pass through the labyrinth seal due to the plurality of annular grooves arranged in parallel, even though there may be a small amount of fluid medium 6 completely passing through the labyrinth seal, since the labyrinth seal is arranged at a position upstream of the location of the seal 4 , the sealing element 4 will seal and block the fluid medium leaking in the labyrinth seal, so as to prevent the fluid medium 6 from leaking out from the joint. The arrangement of the labyrinth seal reduces the fluid flow to the position where the seal 4 is located, reduces the fluid pressure exerted by the fluid medium 6 on the seal 4, improves the sealing reliability and does not cause excessive loss of the first joint and The movability of the second joint makes the sealed joint with adjustable axial length of the present invention suitable for the delivery of fluid medium in a high-pressure fluid system.

In this embodiment, the limit nut, the first joint 1 and the second joint 2 are all made of metal materials with high pressure resistance, such as stainless steel.

The following is a detailed description of the use and installation process of the sealing joint with adjustable axial length in this embodiment:

Insert the second joint 2 into the first joint 1, connect the limit nut to the first joint 1 threadedly, and further adjust the distance between the flange part 22 and the abutting part 11, so that the metal pipe on one side is The pipe is inserted into the first joint 1, and the metal pipeline on the other side is inserted into the second joint 2. After the joint is installed in the metal pipeline, the metal pipelines on both sides can be reliably fixed to the first joint by welding. In the first joint 1 and the second joint 2, the integral installation is completed.

After the axial length adjustable sealing joint of this embodiment is installed in the metal pipeline, the flange portion 22 of the second joint 2 can still be between the abutting portion 11 of the first joint 1 and the limiting member 3 Axial movement, therefore, when the thermal expansion and cold contraction occurs in the metal pipeline and the distance between the pipes changes, the relative movement between the first joint 1 and the second joint 2 automatically adjusts the distance between the pipes. Changes are compensated to avoid conditions such as joint damage or fluid leakage.

Embodiment 2:

When the joint is installed in the metal pipeline, if the first joint 1 and the second joint 2 are not relatively fixed, the fluid medium 6 will exert a thrust on the joint on one side, and the joint will be opposed to the other joint under the action of the thrust The axial movement of the joint makes the entire joint elongated, and the change in the length of the joint will bend and deform the metal pipeline on one side, which will adversely affect the reliability of the metal pipeline system.

Therefore, the difference between the second embodiment and the first embodiment is that a locking member 5 is fixed on the first joint 1 , the locking member 5 penetrates the pipe wall of the first joint 1 , and the bottom of the locking member 5 can abut or partially abut with the flange portion 22 . It is inserted into the flange portion 22 , and in this embodiment, the locking member 5 adopts a locking screw that is threadedly connected to the pipe wall of the first joint 1 . The relative fixation between the first joint 1 and the second joint 2 is achieved by the locking screw, and the relative axial movement of the first joint 1 and the second joint 2 is prevented by the locking screw 5, so that the joint installed in the metal pipeline does not It will be elongated as a whole to enhance the reliability of the metal piping system.

The above-mentioned embodiments are only to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. On the premise of not departing from the design spirit of the present invention, those of ordinary skill in the art can make various kinds of technical solutions of the present invention. Deformations and improvements should all fall within the protection scope of the present invention.

Claims (8)

1. A sealing joint with adjustable axial length, characterized in that it comprises a first joint, a second joint Joints, limit pieces; An abutting portion is arranged in the first joint, and a limiting member is arranged at one end of the first joint away from the abutting portion; The outer side of the second joint is provided with a flange portion; The flange portion of the second joint is inserted into the first joint and is restricted by the axial movement of the abutting portion. The flange portion is restricted between the abutting portion and the limiting member, and can be positioned between the abutting portion and the limiting member. Axial movement between; The flange part is provided with an annular groove, and the annular groove is provided with a seal, and the seal fills the gap between the first joint and the second joint; The inner peripheral wall of the first joint is annularly provided with a groove portion, and the groove portion is opposite to the outer peripheral wall of the second joint and cooperates with each other to form a labyrinth seal. 2 . The axial length adjustable sealing joint according to claim 1 , wherein the groove portion comprises a plurality of annular grooves arranged in parallel, and the plurality of annular grooves arranged in parallel are connected with the second annular groove. 3 . The peripheral walls of the joint cooperate to form a labyrinth seal. 3. A sealing joint with adjustable axial length according to claim 1, wherein The seal adopts a sealing ring. 4. A sealing joint with adjustable axial length according to claim 1, characterized in that the limit The position piece adopts a limit nut, and the limit nut is threadedly connected with the first joint. 5. A sealing joint with adjustable axial length according to claim 4, characterized in that the limit The bit nut is made of pressure-resistant metal material. 6. The axial length adjustable sealing joint according to claim 1, wherein the first A locking piece is fixed on the joint, the locking piece penetrates the pipe wall of the first joint, and the bottom of the locking piece can abut with the flange portion or be partially inserted into the flange portion. 7. The axial length adjustable sealing joint according to claim 6, wherein the lock The fixed piece adopts a locking screw threadedly connected with the pipe wall of the first joint. 8. A sealing joint with adjustable axial length according to claim 1, characterized in that, Both the first joint and the second joint are made of pressure-resistant metal materials.

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