CN107575673A - A kind of high vacuum flange seal - Google Patents

Abstract

The invention discloses a high-vacuum flange seal, which comprises a seal ring, a first flange and a second flange are fixedly connected to both sides of the seal ring through fastening bolts, and the ends of the fastening bolts are A fastening nut is threaded, the outside of the seal ring is provided with a flanging, the middle part of the seal ring is fixedly connected with a contact ring, the inside of the seal ring is fixedly connected with an inner seal ring, and the upper surface of the seal ring A protruding circular ring is bonded, bolt holes are arranged around the contact ring, and a through hole is opened in the middle of the inner sealing ring. The inventive device adopts a special structure to increase the contact area between the flanges and improve the sealing effect. The high elasticity of the natural rubber flanging improves the sealing effect on the flanges, and the raised point ring can effectively prevent excessive stretching and make the seal The surface separation will cause the sealing to fail, while the silicone inner sealing ring can absorb the internal medium and improve the service life of the sealing ring.

Description

A high vacuum flange seal

technical field

The invention relates to the technical field of mechanical connection flange seals, in particular to a high vacuum flange seal.

Background technique

Flange is a metal part that connects pipes and pipes. It involves basically all pipeline engineering and mechanical connection fields. It has the characteristics of high sealing and high stability. Axial force is generated to cause the bolts to be stretched, and the flange sealing surfaces will move along the direction of separation from each other, which will reduce the sealing performance between the flanges, and seals are often inserted at the flange connection, while conventional seals are Thin disc gaskets are mainly used, but their sealing mainly depends on the extrusion of the gasket and the rebound effect after separation. After a long time of use, it is prone to aging damage, and it does not have good adsorption, and it is easy to accumulate internal moisture. If the seal is in a wet state, it is easy to accelerate the aging of the seal, thus affecting the tightness of the internal seal.

Contents of the invention

The purpose of the present invention is to provide a high vacuum flange seal to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the present invention provides the following technical solution: a high vacuum flange seal, including a sealing ring, the two sides of the sealing ring are fixedly connected with a first flange and a second flange by fastening bolts , the end of the fastening bolt is threadedly connected with a fastening nut, the outer side of the sealing ring is provided with a flanging, the middle part of the sealing ring is fixedly connected with a contact ring, and the inside of the sealing ring is fixedly connected with an inner sealing ring , the upper surface of the sealing ring is bonded with a raised dot ring, bolt holes are arranged around the contact ring, and a through hole is opened in the middle of the inner sealing ring.

Preferably, the outer side of the sealing ring is a ring structure, and the inner side of the sealing ring is a truncated cone structure.

Preferably, the material of the flange is natural rubber, and the thickness of the flange is smaller than that of the contact ring.

Preferably, the material of the contact ring and the bump ring is both fluorine rubber.

Preferably, the thickness of the ring of bumps is greater than half of the thickness of the contact ring, and the rings of bumps are equally spaced along the direction of the center of the circle.

Preferably, the inner sealing ring is made of silica gel, and the inner sealing ring is bonded to the inner side of the contact ring by polyurethane AB glue.

Preferably, the outer diameter of the contact ring is equal to the outer diameter of the first flange.

Preferably, the flange is closely attached to the outer side of the first flange, and the inner sealing ring is closely attached to the inner cavity of the second flange.

Compared with the prior art, the beneficial effect of the present invention is that the device of the present invention adopts a special structure of an inner circular platform and an outer circular ring, which increases the sealing contact area between the two flanges and improves the sealing effect, while the natural rubber The flanging acts as a seal on the first flange on the outside, and the convex point ring can prevent the state of seal damage caused by excessive separation of the flange seal due to stretching. The high convex point is used for extreme sealing, and the three rings Strengthen the sealing effect, and the contact ring made of fluorine rubber can effectively improve its characteristics of corrosion resistance, fuel resistance, medium resistance, and low pressure change, and the silicone inner sealing ring can not only seal the second flange from the inside, but also can absorb The internal moisture and medium ensure that the pipe is dry and clean, thereby improving the service life of the entire sealing ring.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is the sectional view of sealing ring of the present invention;

Fig. 3 is a side view of the sealing ring of the present invention.

In the figure: 1-first flange; 2-fastening bolt; 3-sealing ring; 4-fastening nut; 5-second flange; 6-flange; 7-bump ring; 8- Bolt hole; 9-contact ring; 10-inner sealing ring; 11-through hole.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Figures 1-3, the present invention provides a technical solution: a high vacuum flange seal, including a sealing ring 3, the two sides of the sealing ring 3 are fixedly connected with a first flange through fastening bolts 2 1 and the second flange 5, the end of the fastening bolt 2 is threadedly connected with a fastening nut 4, the outer side of the sealing ring 3 is provided with a flange 6, and the middle part of the sealing ring 3 is fixedly connected with a contact ring 9. The inside of the sealing ring 3 is fixedly connected with an inner sealing ring 10, and the upper surface of the sealing ring 3 is bonded with a bump ring 7, and the periphery of the contact ring 9 is provided with bolt holes 8, and the inner A through hole 11 is opened in the middle of the sealing ring 10 .

The outer side of the sealing ring 3 is an annular structure, the inner side of the sealing ring 3 is a truncated cone structure, the material of the flange 6 is natural rubber, and the thickness of the flange 6 is less than the thickness of the contact ring 9, The materials of the contact ring 9 and the bump ring 7 are both fluororubber, the thickness of the bump ring 7 is greater than half of the thickness of the contact ring 9, and the bump rings 7 are equally spaced along the direction of the center of the circle, so The material of the inner seal ring 10 is silica gel, and the inner seal ring 10 is bonded to the inner side of the contact ring 9 by polyurethane AB glue, and the outer diameter of the contact ring 9 is equal to the outer diameter of the first flange 1. The flange 6 is closely attached to the outer side of the first flange 1 , and the inner sealing ring 10 is closely attached to the inner cavity of the second flange 5 .

Working principle: When using this high vacuum flange seal, first place the seal ring 3 upright between the first flange 1 and the second flange 5, and then pass the fastening bolt 2 through the first flange 1 After passing through the bolt hole 8 in the sealing ring 3, it is connected with the second flange 5, and the end is fixed with a fastening nut 4, and the sealing ring 3 is squeezed after the fixing bolt 2 is tightened to form an initial vacuum-tight state inside , while the inner sealing ring 10 extends into the inner cavity of the second flange 5 and is tightly attached to the inner wall, and the flange 6 is tightly attached to the outer wall of the first flange 1. When the axial force stretches the fastening bolt 2 When the sealing surface is relatively separated, the contact ring 9 will rebound and continue to seal. When the rebound range is exceeded, the bump ring 7 will replace the contact ring 9 for ultimate sealing. When other media appear in the pipeline, For substances such as water and impurities, the inner sealing ring 10 made of silica gel can perform adsorption to remove impurities to clean the internal environment, thereby improving the service life of the sealing ring 3 .

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

Claims (8)

1. A high-vacuum flange seal, including a sealing ring (3), characterized in that: both sides of the sealing ring (3) are fixedly connected with a first flange (1) by fastening bolts (2) and the second flange (5), the end of the fastening bolt (2) is threadedly connected with a fastening nut (4), the outer side of the sealing ring (3) is provided with a flange (6), the sealing The middle part of the ring (3) is fixedly connected with a contact ring (9), the inside of the sealing ring (3) is fixedly connected with an inner sealing ring (10), and the upper surface of the sealing ring (3) is bonded with a dot circle ring (7), bolt holes (8) are provided around the contact ring (9), and through holes (11) are opened in the middle of the inner sealing ring (10). 2. A high vacuum flange seal according to claim 1, characterized in that: the outer side of the sealing ring (3) is an annular structure, and the inner side of the sealing ring (3) is a truncated cone structure . 3. A high vacuum flange seal according to claim 1, characterized in that: the material of the flange (6) is natural rubber, and the thickness of the flange (6) is smaller than that of the contact ring (9) thickness of. 4. A high-vacuum flange seal according to claim 1, characterized in that: the material of the contact ring (9) and the bump ring (7) are both fluorine rubber. 5. A high vacuum flange seal according to claim 1, characterized in that: the thickness of the bump ring (7) is greater than half of the thickness of the contact ring (9), and the bump ring ( 7) Distributed at equal intervals along the direction of the center of the circle. 6. A high vacuum flange seal according to claim 1, characterized in that: the inner sealing ring (10) is made of silica gel, and the inner sealing ring (10) is bonded to the contact ring with polyurethane AB glue. (9) Internal bonding. 7. A high vacuum flange seal according to claim 1, characterized in that: the outer diameter of the contact ring (9) is equal to the outer diameter of the first flange (1). 8. A high vacuum flange seal according to claim 1, characterized in that: the flange (6) is closely attached to the outer side of the first flange (1), and the inner sealing ring ( 10) Fit closely with the inner cavity of the second flange (5).