CN218883339U - A New Type of Thick Wall Expansion Joint - Google Patents

Abstract

The utility model relates to the technical field of thick-walled expansion joints, and discloses a novel thick-walled expansion joint, which comprises a bellows, a left flange and a right flange. A compensation tube is welded between the annular discs on both sides, a cavity is formed between the bellows, the annular disc and the compensation tube, and a pressure control hole is opened on the outer surface of the annular disc; The mutual cooperation between the annular disk, the cavity, the pressure control hole and the compensation tube composed of multiple arc surfaces makes the stress concentration on the inner wall of the compensation tube lower during use, and can be effectively used in the expansion joint. Reduce the impact of stress concentration on its inner wall, greatly reducing the probability of stress corrosion, which can effectively improve the service life of the expansion joint, and avoid the serious stress concentration on the inner wall of the expansion joint during use, which is prone to stress corrosion and shorten the service life. Short situations occur.

Description

A New Type of Thick Wall Expansion Joint

technical field

The utility model relates to the technical field of thick-walled expansion joints, in particular to a novel thick-walled expansion joint.

Background technique

The expansion joint is a flexible structure arranged on the container shell or pipeline to compensate for the additional stress caused by temperature difference and mechanical vibration. As an elastic compensation element that can expand freely, it has the advantages of reliable operation, good performance and compact structure, and has been widely used in chemical industry, metallurgy, nuclear energy and other departments. The existing metal thick-walled expansion joint has a relatively simple structure, mainly composed of a bellows part and flanges on both sides. During use, the shape of the bellows part is used to compensate for the pipeline, but in actual use When the fluid inside the pipe enters the bellows part, since the bellows part is in a continuous convex and concave shape, the fluid will continuously turn sharply during the flow process, resulting in a large stress concentration in this part The phenomenon makes the stress concentration of this part larger in the actual use process, and the phenomenon of stress corrosion is prone to occur, which makes the service life of the thick-walled expansion joint lower.

Utility model content

In order to solve the problem of serious stress concentration on the inner wall of the expansion joint and to achieve the above purpose of effectively reducing the stress concentration on the inner wall of the expansion joint, the utility model is realized through the following technical solutions: a new type of thick-walled expansion joint, including corrugated tube, left flange, and right flange, ring-shaped discs are arranged on the left and right sides of the bellows, and compensation tubes are welded between the ring discs on both sides. The bellows, ring-shaped discs And a cavity is formed between the compensation pipes, and a pressure control hole is opened on the outer surface of the annular disc.

Further, the annular disc is welded on the outer surface of the bellows, and the connection between the annular disc and the bellows can be welded or integrally formed. The two annular discs The discs are respectively welded on the outer surfaces of the left flange and the right flange, and the left flange and the right flange are fixedly connected to the bellows through annular discs.

Further, the shape of the compensation tube is corrugated, and the compensation tube is composed of a plurality of arc-shaped parts, and the angle value of the upper arc-shaped parts of the compensation tube is 29°, so that the stress concentration on the inner wall of the compensation tube is relatively small. Small, not prone to stress corrosion, so it can play a good role in protecting the bellows.

Further, the thickness value of the compensation pipe is 3/5 of the thickness value of the bellows, and the deformation angle value range of the upper arc surface of the compensation pipe is: 10°-40°, so that the compensation pipe can be bent along with the bellows Or stretch, so as to ensure the realization of the normal function of the expansion joint.

Further, the number of pressure control holes on each annular disk is at least four, and they are equiangularly distributed on the outer surface of the annular disk, and the pressure control holes on the left and right flanges are One side is connected with the cavity, and the other sides of the pressure control holes on the left flange and the right flange respectively pass through the left flange and the right flange, so that the air pressure inside the cavity can be adjusted. In order to facilitate the normal work of the bellows and the compensation pipe.

The utility model provides a novel thick-wall expansion joint. Has the following beneficial effects:

This new type of thick-walled expansion joint, through the mutual cooperation between the annular disc, the cavity, the pressure control hole and the compensation tube composed of multiple arc surfaces, makes the stress concentration on the inner wall of the compensation tube during use lower, It can effectively reduce the impact of stress concentration on its inner wall during the use of the expansion joint, greatly reducing the probability of stress corrosion, thereby effectively improving the service life of the expansion joint and avoiding serious stress concentration on the inner wall of the expansion joint during use Stress corrosion is prone to occur resulting in a shorter service life.

Description of drawings

Fig. 1 is the partial sectional structure schematic diagram of the utility model;

Fig. 2 is a schematic diagram of the enlarged structure at A in Fig. 1 of the present utility model.

In the figure: 1. bellows; 2. left flange; 3. right flange; 4. annular disc; 5. compensation tube; 6. cavity; 7. pressure control hole.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Examples of the new thick-walled expansion joint are as follows:

Please refer to Figure 1-Figure 2, a new type of thick-walled expansion joint, including bellows 1, left flange 2, right flange 3, bellows 1 is provided with ring-shaped discs 4 on the left and right sides, the ring The ring-shaped disc 4 is welded on the outer surface of the bellows 1, and the connection mode between the ring-shaped disc 4 and the bellows 1 can be a welding connection, or can be integrally formed, and the two ring-shaped discs 4 are welded respectively. On the outer surfaces of the left flange 2 and the right flange 3 , the left flange 2 and the right flange 3 are fixedly connected to the bellows 1 through an annular disc 4 .

Compensation tube 5 is welded between the annular discs 4 on both sides. Compensation tube 5 is made of the same material as bellows 1 and has certain toughness. When subjected to external force, it can be bent at a certain range of angles. The shape of 5 is wavy, and the compensation tube 5 is composed of multiple arc-shaped parts. The angle value of the upper arc-shaped part of the compensation tube 5 is 29°, so that the stress concentration on the inner wall of the compensation tube 5 is small, and stress corrosion is not easy to occur. Therefore, the bellows 1 can be well protected, the thickness of the compensation tube 5 is 3/5 of the thickness of the bellows 1, and the deformation angle value range of the upper arc surface of the compensation tube 5 is: 10°-40° °, so that the compensation pipe 5 can be bent or stretched along with the bellows 1, so as to ensure the realization of the normal function of the expansion joint.

A cavity 6 is formed between the bellows 1, the annular disk 4 and the compensation pipe 5, and the outer surface of the annular disk 4 is provided with pressure control holes 7, and the number of pressure control holes 7 on each annular disk 4 There are at least four, and they are equiangularly distributed on the outer surface of the annular disk 4. One side of the pressure control hole 7 on the left flange 2 and the right flange 3 communicates with the cavity 6, and the left flange 2 1. The other side of the pressure control hole 7 on the right flange 3 runs through the left flange 2 and the right flange 3 respectively, so that the air pressure inside the cavity 6 can be adjusted so that the bellows 1 and the compensation pipe 5 are normal. work in progress.

Working principle: During the use of the expansion joint, the fluid flows through the inside of the compensation pipe 5. Under normal conditions, the angle of the upper arc surface of the compensation pipe 5 is 29°. When the fluid flows through, there will be no sudden turning, so that the compensation pipe The stress concentration on the inner wall of 5 is low, so that it will not cause greater damage to the compensation pipe 5, so that it can play a good role in protecting the bellows 1, so that the inner wall of the expansion joint is not easy to appear during actual use. In the case of severe stress concentration, the service life of the expansion joint can be effectively improved. At the same time, during use, the compensation tube 5 can cooperate with the bellows 1 to meet the normal function of the expansion joint by compensating for the respective bending deformation of multiple arc surfaces on the tube 5. Therefore, it can meet the needs of actual usage.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (5)

1. The utility model provides a novel thick wall expansion joint, includes bellows (1), left ring flange (2), right ring flange (3), its characterized in that: the left and right sides of bellows (1) all is provided with cyclic annular disc (4), and the welding has compensating pipe (5) between cyclic annular disc (4) of both sides, be formed with cavity (6) between bellows (1), cyclic annular disc (4) and compensating pipe (5), accuse pressure hole (7) have been seted up to the surface of cyclic annular disc (4).

2. A novel thick-walled expansion joint as claimed in claim 1, wherein: annular disc (4) welding is at the surface of bellows (1), two annular disc (4) welds respectively at the surface of left ring flange (2) and right ring flange (3), left side ring flange (2), right ring flange (3) are through annular disc (4) and bellows (1) fixed connection.

3. A novel thick-walled expansion joint as claimed in claim 2, wherein: the shape of the compensating pipe (5) is wavy, the compensating pipe (5) is composed of a plurality of arc-surface-shaped parts, and the angle value of the arc-surface-shaped parts on the compensating pipe (5) is 29 degrees.

4. A novel thick-walled expansion joint as claimed in claim 3, wherein: the thickness value of the compensating pipe (5) is 3/5 of the thickness value of the corrugated pipe (1), and the deformation angle value range of the upper arc surface part of the compensating pipe (5) is as follows: 10 to 40 degrees.

5. A novel thick-walled expansion joint as claimed in claim 4, wherein: every the quantity of accuse pressure hole (7) is four at least on cyclic annular disc (4), and the equal angular distribution is at the surface of cyclic annular disc (4), one side and cavity (6) of accuse pressure hole (7) are linked together on left flange dish (2), right flange dish (3), the opposite side of accuse pressure hole (7) runs through left flange dish (2), right flange dish (3) respectively on left flange dish (2), right flange dish (3).

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