A durable and highly matched metal octagonal pad and a design method thereof

Abstract

The invention discloses a metal octagonal gasket with high durability and matching degree and a design method thereof, comprising an octagonal gasket body, and circular grooves are distributed on the sealing contact ring surfaces on both sides of the octagonal gasket body, and the bottom of the circular groove is connected to the rubber round block through a spring. The invention is beneficial in that: the spring connected between the rubber round block and the circular groove is used to buffer the extrusion strength of the flange on the sealing contact ring surface, so as to prevent the octagonal gasket from being seriously damaged by the external force due to instantaneous excessive pressure, and ensure that the sealing contact strength between the octagonal gasket body and the flange is within a reasonable range; according to the width of the sealing contact ring surface on the flange, combined with the limited width between the inner and outer ring surfaces of the octagonal gasket body and the angle between the sealing contact ring surface and the oblique ring surface located on the octagonal gasket body, the oblique ring surface width and the sealing contact ring surface width of the octagonal gasket body can be determined quickly and conveniently, which simplifies the cumbersome design calculation and improves the matching degree of the seal between the octagonal gasket and the flange.

Description

Technical Field

[0001] The invention relates to the technical field of pressure pipes and pressure vessels, and in particular to a metal octagonal gasket with high durability and matching degree and a design method thereof. Background Art

[0002] The octagonal gasket body has the function of radial self-tightening and is widely used in high-pressure flanges of CL900 (PN150) and above. The existing metal octagonal gaskets with high durability and matching degree are in direct contact with the corresponding structural surface on the flange, and the matching sealing accuracy is not high. The external impact force exceeds the set strength, which is easy to cause irreversible pressure loss of the metal octagonal gasket with high durability and matching degree. In addition, the design and calculation of the inclined ring surface on the metal octagonal gasket with high durability and matching degree is difficult. Therefore, in view of the above problems, a metal octagonal gasket with high durability and matching degree and its design method are proposed. Summary of the invention

[0003] The purpose of the present invention is to provide a metal octagonal pad with high durability and matching degree and a design method thereof in order to solve the above problems.

[0004] The present invention achieves the above-mentioned purpose through the following technical scheme, a design method of a metal octagonal pad with high durability and matching degree, characterized in that it includes the following steps:

[0005] Step 1: Obtain the contact ring width of the seal applied to the flange , initially determine the width between the inner and outer ring surfaces of the octagonal pad body ,in ;

[0006] Step 2: According to the conditional relationship between the width of the sealing contact ring surface and the width of the sealing member contact ring surface: , we get: , take the critical minimum value as the determined value ,in , ;

[0007] Step 3: Limit and Size, initial The angle size is Size length, if The larger the The smaller the The longer the length, the The angle depends on the inclination angle of the outer bevel of the edge of the seal contact ring surface;

[0008] Step 4: Use the data obtained in step 3 and , further determine the structural bearing thickness between the sealing contact ring surface and the middle of the octagonal gasket body section is .

[0009] The durable and highly matched metal octagonal pad comprises an octagonal pad body, and the sealing contact ring surfaces on both sides of the octagonal pad body are both provided with circular grooves, and the bottom of the circular groove is connected to the rubber round block through a spring, and the width of the sealing contact ring surface is Width of the ring surface in contact with the seal The conditional relationship between ,in, is the width between the inner and outer ring surfaces of the octagonal pad body, is the width of the oblique annulus, It is the angle between the sealing contact annular surface and the oblique annular surface located on the octagonal pad body.

[0010] Preferably, the annular surface portion of the rubber round block is in sliding contact with the inner wall of the circular groove.

[0011] Preferably, the length of the rubber ball is much smaller than the maximum compression length of the spring.

[0012] The beneficial effects of the present invention are:

[0013] The spring connected between the rubber round block and the round groove plays the role of buffering the extrusion strength of the flange on the sealing contact ring surface, preventing the external force from being too large instantly and seriously damaging the octagonal gasket body, and ensuring that the sealing contact strength between the octagonal gasket body and the flange is within a reasonable range;

[0014] The width of the oblique annular surface and the width of the sealing contact annular surface of the octagonal gasket body can be determined quickly and conveniently according to the width of the sealing contact annular surface on the flange, combined with the limited width between the inner and outer annular surfaces of the octagonal gasket body and the angle between the sealing contact annular surface and the oblique annular surface on the octagonal gasket body, which greatly simplifies the tedious design calculations and improves the matching degree of the seal between the octagonal gasket body and the flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0017] Figure 2 It is a side view of the overall structure of the present invention;

[0018] Figure 3 It is a cross-sectional view of a local structure of the present invention;

[0019] Figure 4 This is a schematic diagram of the structural analysis of the octagonal pad body in this design method.

[0020] In the figure: 1, octagonal gasket body; 110, sealing contact annular surface; 111, circular groove; 120, oblique annular surface; 2, rubber round block; 3, spring; 4, flange; 410, sealing contact annular surface. DETAILED DESCRIPTION

[0021] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0023] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] See also Figure 1-3 As shown, a design method of a metal octagonal pad with high durability and matching degree is characterized by comprising the following steps:

[0025] Step 1: Obtain the width of the seal contact ring surface 410 applied to the flange 4 , initially determine the width between the inner and outer ring surfaces of the octagonal pad body 1 ,in ;

[0026] Step 2: According to the conditional relationship between the width of the sealing contact annular surface 110 and the width of the sealing member contact annular surface 410, , we get: , take the critical minimum value as the determined value ,in , ;

[0027] Step 3: Limit and Size, initial The angle size is Size length, if The larger the The smaller the The longer the length, the The angle depends on the inclination angle of the outer side slope of the edge of the sealing contact ring surface 410;

[0028] Step 4: Use the data obtained in step 3 and , further determine the structural bearing thickness between the sealing contact annular surface 110 and the middle of the cross section of the octagonal pad body 1 is .

[0029] The durable and highly matched metal octagonal pad comprises an octagonal pad body 1, and circular grooves 111 are distributed on the sealing contact annular surfaces 110 on both sides of the octagonal pad body 1, and the inner bottom of the circular groove 111 is connected to the rubber round block 2 through the spring 3, and the annular surface of the rubber round block 2 is in sliding contact with the inner wall of the circular groove 111, and the length of the rubber round block 2 is much smaller than the maximum compression length of the spring 3;

[0030] The spring 3 connected between the rubber round block 2 and the circular groove 111 plays the role of buffering the squeezing strength of the flange 4 on the sealing contact annular surface 110, preventing the external force from being too large instantly and seriously damaging the octagonal gasket body 1, and ensuring that the sealing contact strength between the octagonal gasket body 1 and the flange 4 is within a reasonable range.

[0031] Combination Figure 4 As shown, the width of the sealing contact annular surface 110 is Width of the annular surface 410 in contact with the seal The conditional relationship between ,in, is the width between the inner and outer annular surfaces of the octagonal pad body 1, is the width of the oblique annular surface 120, It is the angle between the sealing contact annular surface 110 and the oblique annular surface 120 located on the octagonal pad body 1 .

[0032] This design method can determine the width of the oblique annular surface of the octagonal gasket body and the width of the sealing contact annular surface 110 quickly and conveniently according to the width of the sealing contact annular surface 410 on the flange, combined with the limited width between the inner and outer annular surfaces of the octagonal gasket body 1 and the angle between the sealing contact annular surface 110 and the oblique annular surface 120 located on the octagonal gasket body 1, thereby greatly simplifying the tedious design calculations and improving the matching degree of the seal between the octagonal gasket body and the flange.

[0033] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0034] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A design method for a durable and highly matched metal octagonal pad, characterized in that: The steps include: Step 1: Obtain the width of the seal contact ring surface (410) applied to the flange (4) , initially determine the width between the inner and outer ring surfaces of the octagonal pad body (1) ; Step 2: According to the conditional relationship between the width of the sealing contact annular surface (110) and the width of the sealing member contact annular surface (410), , we get: , take the critical minimum value as the determined value ,in , ; Step 3: Limit and Size, initial The angle size is Size length, if The larger the The smaller the The longer the length, the The angle depends on the inclination angle of the outer bevel of the edge of the sealing contact ring surface (410); Step 4: Use the data obtained in step 3 and , further determining the structural bearing thickness between the sealing contact annular surface (110) and the middle of the cross section of the octagonal gasket body (1) as ; The durable and highly matched metal octagonal pad comprises an octagonal pad body (1), the sealing contact annular surfaces (110) on both sides of the octagonal pad body (1) are both provided with circular grooves (111), and the inner bottom of the circular groove (111) is connected to the rubber round block (2) via a spring (3), and the width of the sealing contact annular surface (110) is Width of the ring surface (410) in contact with the seal The conditional relationship between ,in, is the width of the oblique annular surface (120), It is the angle between the sealing contact annular surface (110) and the oblique annular surface (120) located on the octagonal pad body (1).

2. The design method of a durable and highly matched metal octagonal pad according to claim 1, characterized in that: The annular surface portion of the rubber round block (2) is in sliding contact with the inner wall of the circular groove (111).

3. The design method of a durable and highly matched metal octagonal pad according to claim 1, characterized in that: The length of the rubber round block (2) is much smaller than the maximum compression length of the spring (3).

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