CN216976107U - Spigot-and-socket type pipeline sealing interface with stepless change compression ratio - Google Patents

Abstract

The utility model provides a socket-type pipeline sealing interface with stepless variable compression ratio, which comprises a socket and a sealing rubber ring, wherein the sealing rubber ring is composed of a support part and a sealing part; the conical sealing of the socket is The third line of intersection where the plane intersects with the cut plane forms ∠A with the horizontal plane; the first line of intersection where the inner surface of the sealing portion of the sealant and the cut plane intersect and the second line of intersection where the outer surface of the seal portion and the cut plane intersect parallel to each other. Under the premise that the tolerance range of the existing ductile iron pipeline remains unchanged, the sealing ratio of the rubber ring to realize any interface formed by the installation and connection of the pipeline is a continuous and stepless range, rather than a relatively fixed value. To ensure that there is always an optimal sealing compression ratio for the interface, it is suitable for long-term and safe sealing of high-temperature water media.

Description

A socket-type pipeline sealing interface with infinitely variable compression ratio

technical field

The utility model belongs to the technical field of socket-type pipeline production, in particular to a socket-type pipeline sealing interface with a stepless variable compression ratio.

Background technique

Ductile iron pipes are commonly used pipes in water supply and drainage projects, but the main transport medium at present is low-temperature water medium. The sealing of the interface mainly depends on the compression of the rubber ring by the interface components. The degree of compression can be called the compression ratio. The compression ratio of the rubber ring and the interface The tolerance of the components is relatively large. As shown in Figure 4, it is a sectional view of a disclosed existing interface sealing rubber ring in its natural state. The structure of the sealing rubber ring is divided into two parts, namely the support part and the sealing part. As shown in Figure 4, after the interface is installed, it is as shown in Figure 5, and its compression ratio is expressed as:

Compression ratio (%)=[(φB-G)/φB]×100%

Among them, φB is the diameter of the spherical sealing part of the sealing rubber ring in its natural state;

G is the two annular surfaces of the interface sealing part, that is, as shown in Figure 5, the height value of the gap formed by the corresponding annular sealing surface and the annular surface of the outer wall of the socket, when the interface is installed, the height of G is the compressed rubber ring. Thickness; while the G value is directly related to the manufacturing tolerance of the socket and socket that constitute the interface. As a cast product, the tolerance range of the socket and socket is much larger than that of machining. Therefore, the actual size of the compression ratio varies greatly. According to different The interface design principle can be from 20% to 50% to adapt to the working conditions with large changes in the sealing gap to ensure the sealing effect.

For any qualified product produced, the compression ratio formed after installation is different. When encountering an interface with a relatively large compression ratio, although the sealing of normal temperature water can be ensured, for high temperature water media, high compression ratio will make The rubber ring produces a faster aging phenomenon, which leads to the sealing failure of the rubber ring. There are already relevant research papers on the influence of temperature and pressure on the aging of the rubber ring, as follows: Xiong Ying and other researchers published in the Journal of Equipment Environmental Engineering (2012 June 9, Volume 9, Issue 3) article: "Research on Stress-Accelerated Aging Behavior of Nitrile Rubber", the article takes nitrile rubber as an example, its unstressed, flexural stress, and tensile stress at different temperatures -The storage life of the rubber ring under the combined stress of bending has been calculated with accelerated aging, and the list is as follows:

Table 1 Predicted life of NBR at test temperature under different stress

Table1Storage life of NBR at different temperature and underdifferent stress

。

.

It can be clearly seen from the table that at the same temperature state, from no stress to bending stress, and then to tension-bending, the predicted life value is greatly reduced. Taking 120 ° C as an example, from no stress to tension The extension-bending action shortens its life to about 1% of the original life, which has a huge impact. Under the guidance of the above paper, the actual test of the sealing rubber ring in the natural state, installation and compression state was carried out. The results were consistent with the trend of the paper, and even short-term damage occurred at high temperature and high compression ratio. Therefore, when the conveying medium is high-temperature water, the tolerance of the interface components needs to be strictly required, which will bring great difficulty to the production system and at the same time greatly increase the reject rate.

SUMMARY OF THE INVENTION

The purpose of this utility model is to solve the shortcomings existing in the prior art, the utility model proposes a sealing interface that can realize the stepless change of the compression ratio, that is, at the sealing interface formed after any product is connected, there are suitable , Compression ratio that can adapt to high temperature conditions, to ensure the tightness and long life of high temperature water medium transportation.

The technical scheme adopted by the utility model is:

A socket-type pipe sealing interface with stepless compression ratio, comprising a socket, a socket and a sealing rubber ring, the sealing rubber ring is composed of a support part and a sealing part; the conical sealing surface of the socket is connected with the section The third intersecting line segment intersected by the tangential planes forms ∠A with the horizontal plane; the first intersecting line intersecting the inner surface of the sealing portion of the sealing rubber ring and the sectional plane intersecting with the second intersecting line intersecting the outer surface of the sealing portion and the sectional plane are parallel to each other; The distance from the end point of the third intersection line near the pipe axis to the surface of the socket is G1, and the distance from the end point of the third intersection line away from the pipe axis to the socket surface is G2;

The proportional relationship between the vertical distance T between the first intersection line and the second intersection line and the sealing gaps G1 and G2 after the sealing interface has been installed is:

1>G1/G2≥0.7.

Further, the value of ∠A is 1° to 5°.

Further, the Shore hardness A of the sealing portion of the sealing rubber ring is between 50° and 75°.

Further, the Shore hardness A of the support portion of the sealing rubber ring is between 75° and 90°.

The beneficial effects obtained by the utility model are as follows: on the premise that the tolerance range of the existing ductile iron pipes remains unchanged, the sealing ratio of the rubber ring of any interface formed by the installation and connection of the pipes is a continuous and stepless range without changing the range. Then there is a relatively fixed value to ensure that there is always an optimal sealing compression ratio for the interface, which is suitable for long-term and safe sealing of high-temperature water media.

Description of drawings

Fig. 1 is the sectional view of the socket part provided by the utility model;

2 is a sectional view of the interface sealing rubber ring provided by the utility model in a natural state;

3 is a sectional view of the sealing interface provided by the utility model in an installed state;

4 is a sectional view of a disclosed existing interface sealing rubber ring in a natural state;

5 is a cross-sectional view of a disclosed existing interface in an installed state;

Among them, 1 represents the socket, 2 represents the sealing rubber ring, 3 represents the support part, 4 represents the sealing part, 5 represents the first intersection, 6 represents the second intersection, and 7 represents the third intersection.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example.

As shown in Figures 1-3, a socket-type pipe sealing interface with stepless compression ratio includes a socket 1, a socket and a sealing rubber ring 2, the sealing rubber ring 2 is composed of a support part 3 and a sealing part 4 Composition; the third intersection line 7 where the conical sealing surface of the socket 1 intersects with the cut surface forms ∠A with the horizontal plane; the first intersection line where the inner surface of the sealing portion 4 of the sealing rubber ring 2 intersects with the cut surface 5. The second intersection line 6 intersecting with the outer surface of the sealing part 4 and the section plane is parallel to each other; the distance from the end point of the third intersection line segment 7 near the pipe axis to the socket surface is G1, and the third intersection line segment 7 is far from the pipe axis. The distance from the end point to the socket surface is G2; the proportional relationship between the vertical distance T between the first intersection line 5 and the second intersection line 6 and the sealing gaps G1 and G2 after the sealing interface is installed is: 1>G1/G2 ≥0.7. The value of ∠A is 1° to 5°. The Shore hardness A of the sealing portion 4 of the sealing rubber ring 2 is between 50° and 75°. The Shore hardness A of the support portion 3 of the sealing rubber ring 2 is between 75° and 90°.

The implementation steps are as follows:

First, install the sealing rubber ring 2 of the present invention as shown in FIG. 2 to the corresponding position in the socket 1 of the present invention, then push the socket to insert it into the socket 1 of the present invention, and install it in place, as shown in FIG. 3 . At this time, due to the existence of ∠A on the conical sealing surface of the socket 1, the compression degree of the sealing rubber ring 2 shows a linear decreasing trend from the left to the right of the conical sealing surface shown in Figure 3, that is, the compression ratio is A range of stepless change, that is, the interface formed by any two specific products installed and connected through sockets and sockets has a series of compression ratios within a certain range at the same time.

Example:

When the size of the conical sealing surface of the socket 1 of this interface is at the upper limit of the tolerance, and the size of the outer wall of the socket is at the lower limit of the tolerance, that is, when the G1 and G2 values are at the maximum value, the left side of the conical sealing surface and the right side of the conical sealing surface. The compression ratios are all at the lowest value, ensuring that the compression ratio is between 15% and 31%, and at least the compression ratio from the left side of the conical sealing surface to the midpoint of the conical sealing surface is between 23% and 29%, It can effectively ensure the sealing effect and ensure long-term life when transporting high temperature water medium.

When the size of the conical sealing surface of the socket 1 of this interface is at the lower tolerance limit, and the size of the outer wall of the socket is at the upper tolerance limit, that is, when the G1 and G2 values are at the minimum value, the left side of the conical sealing surface and the right side of the conical sealing surface are The compression ratio is at the highest value, ensuring that the compression is between 31% and 42%, and at least the compression ratio from the midpoint of the conical sealing surface to the right side of the conical sealing surface is between 31% and 36.5%. Effectively ensure the sealing effect, and ensure long-term life when transporting high-temperature water media.

The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or modification of the new technical solution and its inventive concept shall be included within the protection scope of the present invention.

Claims (4)

1. The utility model provides a socket joint formula pipeline sealing interface with infinitely variable compression ratio, includes bellmouth (1), socket and sealing rubber ring (2), its characterized in that: the sealing rubber ring (2) consists of a supporting part (3) and a sealing part (4); a third cross line segment (7) which is formed by the conical sealing surface of the socket (1) and the cross section and a horizontal plane form an angle A; a first intersection line (5) formed by the intersection of the inner surface of the sealing part (4) of the sealing rubber ring (2) and the cutting surface is parallel to a second intersection line (6) formed by the intersection of the outer surface of the sealing part (4) and the cutting surface; the distance from the end point of the third line segment (7) close to the pipeline axis to the socket surface is G1, and the distance from the end point of the third line segment (7) far from the pipeline axis to the socket surface is G2;

the vertical distance T between the first intersection line (5) and the second intersection line (6) and the sealing gap G after the sealing interface is installed₁And G₂The proportion relation is as follows:

1＞G1/G2≥0.7。

2. the spigot-and-socket pipe sealing interface with infinitely variable compression ratio of claim 1, wherein: the < A value is 1-5 degrees.

3. The spigot-and-socket pipe sealing interface with infinitely variable compression ratio of claim 1, wherein: the Shore hardness A of the sealing part (4) of the sealing rubber ring (2) is between 50 and 75 degrees.

4. The spigot-and-socket pipe sealing interface with infinitely variable compression ratio of claim 1, wherein: the Shore hardness A of the supporting part (3) of the sealing rubber ring (2) is between 75 and 90 degrees.

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