Vacuum corrugated pipe sealing structure

Abstract

The utility model relates to the technical field of corrugated pipes, in particular to a vacuum corrugated pipe sealing structure which comprises a pipe body and a flange plate fixedly connected with the end of the pipe body, the pipe body is fixedly connected with the flange plate, a sealing groove is formed in the side face of the flange plate, and a sealing ring is installed in the sealing groove. A disc spring is further fixedly installed in the sealing groove, the other end of the disc spring is fixedly connected with a sealing plate, a limiting ring is arranged at the position, close to a groove opening, of the sealing groove, a protruding part corresponding to the limiting ring is arranged at the end, close to the sealing groove, of the sealing ring, and the end, close to the disc spring, of the protruding part is tightly attached to the sealing plate. The interior of the sealing ring is hollow, and a bolt hole is formed in the flange plate. The sealing ring has the advantages that an area for the sealing ring to expand is reserved at the connecting position of the flange plate and the sealing ring, it can be guaranteed that the sealing ring does not displace when expanding through the limiting ring, and the enough sealing effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of bellows technology, and more specifically, to a vacuum bellows sealing structure. Background Technology

[0002] A bellows is a tubular elastic sensing element made of foldable corrugated sheets connected along the folding and expansion direction. Bellows mainly include metal bellows, bellows expansion joints, bellows heat exchange tubes, and metal hoses. Metal bellows are primarily used to compensate for pipeline thermal deformation, dampen vibrations, and absorb pipeline settlement deformation. They are widely used in petrochemical, aerospace, chemical, power, metallurgical, and ultra-high vacuum environments for transporting gas and liquids. Bellows used in ultra-high vacuum environments are generally made of stainless steel, which is simple to manufacture and has a low cost.

[0003] However, it has been found in use that the sealing ring inside the traditional vacuum bellows may expand or contract under thermal expansion and contraction conditions, which greatly reduces the sealing effect of the sealing ring and increases the number of maintenance and repairs required in later engineering projects, resulting in poor actual performance. Utility Model Content

[0004] The purpose of this invention is to provide a vacuum bellows sealing structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, a vacuum bellows sealing structure is provided, including a pipe body and a flange fixedly connected to the end of the pipe body. The pipe body and the flange are fixedly connected, and a sealing groove is provided on the side of the flange, and a sealing ring is installed in the sealing groove.

[0006] A disc spring is also fixedly installed in the sealing groove. A sealing plate is fixedly connected to the other end of the disc spring. A limiting ring is provided near the opening of the sealing groove. A protrusion corresponding to the limiting ring is provided at one end of the sealing ring near the sealing groove. Both the inner and outer sides of the protrusion are provided with wedge-shaped inclined surfaces. The end of the protrusion near the disc spring is in close contact with the sealing plate.

[0007] The sealing ring is hollow inside, and bolt holes are provided on the flange.

[0008] Furthermore, the sealing groove is divided into an inner ring groove and an outer ring groove, with a partition wall between the inner ring groove and the outer ring groove, and both the inner ring groove and the outer ring groove are located on the same side of the flange.

[0009] Furthermore, the number of limiting rings is not less than four, the number of protrusions is not less than two, the limiting rings are wrapped around the inner and outer ring walls of the protrusions, the outer wall of the limiting rings is in contact with the groove wall of the sealing groove, and a wedge groove is provided on one side of its inner wall. The wedge groove is a trapezoidal structure that is wider at the top and narrower at the bottom, and an expansion gap is left between the wedge groove and the outer or inner wall of the protrusion.

[0010] Furthermore, the disc spring is made of metal, while the sealing ring, protrusion, and sealing plate are all made of rubber.

[0011] Furthermore, the limiting ring, flange, and pipe body are made of the same metal material.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] A disc spring and a sealing plate are installed inside the sealing groove. When the sealing ring and the protrusion expand in the axial direction, the protrusion will squeeze the sealing plate, and the sealing plate will further squeeze the disc spring to compress it, providing a sufficient expansion area for the expansion of the sealing ring and the protrusion.

[0014] A wedge groove is provided on the inner side of the limiting ring, and an expansion gap is left between the wedge groove and the outer or inner wall of the protrusion. This allows the protrusion to deform inward or outward when it expands, providing sufficient space. At the same time, since both the outer and inner walls of the protrusion are provided with inclined surfaces that match the limiting ring, when the protrusion deforms, it expands or contracts simultaneously outward or inward, and the position of its main body does not change, thus still having a good sealing effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0018] Figure 4 This is a schematic diagram of the sealing ring and the protrusion in this utility model;

[0019] Figure 5 This is a schematic diagram of the disc spring in this utility model;

[0020] Figure 6 for Figure 4 Enlarged view of a local structure.

[0021] The meanings of the labels in the diagram are as follows:

[0022] 1. Pipe body; 2. Flange; 3. Sealing groove; 4. Sealing ring; 5. Disc spring; 6. Sealing plate; 7. Limiting ring; 8. Protrusion; 9. Bolt hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” and “described” used herein may also include the plural forms. It should be further understood that the word “comprising” as used in this specification means the presence of the described features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0025] Please see Figure 1-6 As shown, a vacuum bellows sealing structure is provided, including a pipe body 1 and a flange 2 fixedly connected to the end of the pipe body 1. The pipe body 1 and the flange 2 are fixedly connected. A sealing groove 3 is provided on the side of the flange 2, and a sealing ring 4 is installed in the sealing groove 3.

[0026] A disc spring 5 is also fixedly installed in the sealing groove 3. A sealing plate 6 is fixedly connected to the other end of the disc spring 5. A limiting ring 7 is provided near the groove opening of the sealing groove 3. The limiting ring 7 and the flange 7 adopt an integral molding structure design. The sealing plate 6 is tightly attached to the limiting ring 7 under the action of the disc spring 5. A protrusion 8 corresponding to the limiting ring 7 is provided at one end of the sealing ring 4 near the sealing groove 3. The inner and outer sides of the protrusion 8 are provided with wedge-shaped inclined surfaces. The end of the protrusion 8 near the disc spring 5 is tightly attached to the sealing plate 6.

[0027] The sealing ring 4 is hollow inside, and the flange 2 has bolt holes 9.

[0028] It is important to note that the protrusion 8 consists of two rings with different diameters. During installation, since the limiting ring 7 is located at the opening of the sealing groove 3, the protrusion 8 cannot be directly inserted into the sealing groove 3. Therefore, the inner and outer walls of the protrusion 8 need to be compressed simultaneously so that the protrusion 8 can be precisely locked between the inner and outer limiting rings 7. In this way, the protrusion 8 and the sealing ring 3 will not be displaced during the process of tightening the flange 2 through the bolt hole 9.

[0029] It is important to note that the flange 2 and the limiting ring 7 are made of metal, while the protrusion 8 and the sealing ring 3 are made of rubber. The coefficients of thermal expansion and contraction of the two are also different. The main difference is that the rubber material will undergo greater deformation. When the sealing ring 3 and the protrusion 8 expand in the axial direction, the protrusion 8 will squeeze the sealing plate 6, and the sealing plate 6 will further squeeze the disc spring 5 to compress it, providing sufficient expansion area for the expansion of the sealing ring 3 and the protrusion 8. In this embodiment, the sealing ring 3 and the protrusion 8 adopt an integral molding structure.

[0030] In this embodiment, the sealing groove 3 is divided into an inner ring groove and an outer ring groove, and a partition wall is provided between the inner ring groove and the outer ring groove. The inner ring groove and the outer ring groove are both located on the same side of the flange 2.

[0031] like Figure 4 and Figure 6 As shown, the number of limiting rings 7 is not less than four, the number of protrusions 8 is not less than two, the limiting rings 7 are wrapped around the inner and outer ring walls of the protrusions 8, the outer wall of the limiting rings 7 is in contact with the groove wall of the sealing groove 3, and a wedge groove is provided on one side of its inner wall. The wedge groove is a trapezoidal structure that is wider at the top and narrower at the bottom. An expansion gap is left between the wedge groove and the outer or inner wall of the protrusions 8.

[0032] The expansion gap formed between the wedge groove and the outer or inner wall of the protrusion 8 allows the protrusion 8 to deform inward or outward when it expands, providing sufficient space. It should be noted that since both the outer and inner walls of the protrusion 8 are provided with inclined surfaces that match the limiting ring 7, when the protrusion 8 deforms, it expands or contracts simultaneously outward or inward, and the position of its main body does not change, thus still having a good sealing effect.

[0033] like Figure 3 As shown, the interior of the heat dissipation groove 4 has a Laval tube structure with large openings at both ends and a small opening at the throat in the middle. According to the characteristics of the Laval tube, when the airflow passes through the interior of the heat dissipation groove 4, the airflow will be accelerated twice, which can greatly improve the heat dissipation effect on the inner box 2.

[0034] As for the sealing ring 4, it is squeezed by the flange 2 and the connecting piece on the other side in the axial direction and cannot deform. Therefore, when it expands, it can only expand outward or inward. The expansion or contraction in this direction does not affect the sealing effect of the connection.

[0035] It is important to note that the sealing ring 4 is a hollow structure, which results in a smaller volume change compared to a solid structure when it expands and contracts with temperature. This further avoids the possibility of reduced sealing performance due to thermal expansion and contraction.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A vacuum bellows sealing structure, comprising a pipe body (1) and a flange (2) fixedly connected to the end of the pipe body (1), characterized in that: The pipe body (1) is fixedly connected to the flange (2), and a sealing groove (3) is provided on the side of the flange (2), and a sealing ring (4) is installed in the sealing groove (3). A disc spring (5) is also fixedly installed in the sealing groove (3). A sealing plate (6) is fixedly connected to the other end of the disc spring (5). A limiting ring (7) is provided near the opening of the sealing groove (3). A protrusion (8) corresponding to the limiting ring (7) is provided at one end of the sealing ring (4) near the sealing groove (3). A wedge-shaped inclined surface is provided on both the inner and outer sides of the protrusion (8). The end of the protrusion (8) near the disc spring (5) is tightly fitted with the sealing plate (6). The sealing ring (4) is hollow inside, and the flange (2) has bolt holes (9).

2. The vacuum bellows sealing structure according to claim 1, characterized in that: The sealing groove (3) is divided into an inner ring groove and an outer ring groove. A partition wall is provided between the inner ring groove and the outer ring groove. The inner ring groove and the outer ring groove are both located on the same side of the flange (2).

3. The vacuum bellows sealing structure according to claim 2, characterized in that: The number of limiting rings (7) is not less than four, and the number of protrusions (8) is not less than two. The limiting rings (7) are wrapped around the inner and outer ring walls of the protrusions (8). The outer wall of the limiting rings (7) is in contact with the groove wall of the sealing groove (3). A wedge groove is provided on one side of its inner wall. The wedge groove is a trapezoidal structure that is wider at the top and narrower at the bottom. An expansion gap is left between the wedge groove and the outer or inner wall of the protrusion (8).

4. The vacuum bellows sealing structure according to claim 3, characterized in that: The disc spring (5) is made of metal, and the sealing ring (4), protrusion (8) and sealing plate (6) are all made of rubber.

5. The vacuum bellows sealing structure according to claim 4, characterized in that: The limiting ring (7), flange (2) and pipe body (1) are made of the same metal material.

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