CN218494179U

CN218494179U - Welding ring gasket

Info

Publication number: CN218494179U
Application number: CN202222758395.4U
Authority: CN
Inventors: 罗建利
Original assignee: Cixi Burgmann Sealing Materials Co ltd
Current assignee: Cixi Burgmann Sealing Materials Co ltd
Priority date: 2022-10-19
Filing date: 2022-10-19
Publication date: 2023-02-17
Anticipated expiration: 2032-10-19

Abstract

The utility model relates to a welding annular gasket, including two half the welding ring that laminate the setting each other, each welding ring has the basal portion that is used for pasting on self corresponding flange and welds on it, its characterized in that: each half-cut of welding ring has corresponding half-cut of ring, each in the binding face of laminating each other half-cut of ring can allow half-at least partial crooked of welding ring of self, compare with prior art, the utility model has the advantages of: each ring half slit can allow the corresponding welding ring half to bend at least partially for absorbing radial loads to compensate for radial movement to some extent, while the two welding ring halves arranged next to each other can also be deformed to some extent in the inner hollow space formed by the ring half slits of both, thereby compensating for radial loads, so that the welding ring shim is adapted to become larger to compensate for radial movement in devices that cause high dynamic loads on the flange, i.e. when there is a difference in radial expansion.

Description

Welding ring gasket

Technical Field

The utility model relates to a seal gasket technical field especially relates to a welding annular gasket.

Background

The flange is a common connecting piece between equipment and pipelines. The sealing form and the sealing effect of the flange connection are important factors determining the quality of the flange connection. At present, a frequently-adopted flange structure is basically composed of an upper flange, a fastening piece, a sealing gasket and a lower flange, wherein the upper flange is connected with equipment and a pipeline, the lower flange is connected with the equipment and the pipeline, the upper flange and the lower flange are connected together through the fastening piece, the upper flange and the lower flange are sealed by the sealing gasket, the sealing gasket determines the form of the sealing gasket according to the sealing form (plane, concave-convex surface or annular groove surface and the like) of the flange, and the normal operation of the equipment and the pipeline is ensured.

The ring seal of the sealing gasket is preferably used when particularly high demands are made on the required sealing properties. For example, dangerous or highly dangerous media, which are under high pressure or have a very high temperature, are transported in the process plant. For this purpose, it is necessary to ensure that even a minimum bypass flow cannot exit the flange connection. For example, a chinese utility model patent No. ZL201721083577.9 (publication No. CN 207112161U) discloses a flange seal structure, which realizes sealing of an inner space between an upper seal ring and a lower seal ring by providing a seal gasket on a seal surface between the upper seal ring and the lower seal ring, realizes sealing of an outer space between the upper seal ring and the lower seal ring by providing a weld ring on a line of an integral seal ring formed by the upper seal ring and the lower seal ring, and although it realizes double sealing in the flange connection structure, if there is a difference in radial expansion in a device that causes a high dynamic load of a flange, the seal gasket is small in a degree of compensating for radial movement, and further improvement is required.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to above-mentioned prior art current situation and provide a welding annular gasket of better compensation flange radial movement degree.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: this welding ring shape gasket, including two welding ring halves that laminate the setting each other, each welding ring half has the basal portion that is used for pasting the flange that corresponds at self and welds on it, its characterized in that: each welding ring half has a corresponding ring half cut in the abutting faces abutting against each other, each of said ring half cuts being able to allow the welding ring half itself to bend at least partially.

Furthermore, each welding ring half part is provided with a first annular notch with an opening facing the abutting surface from the ring half notch to the outside in the radial direction in the abutting surface abutting with each other. When the welding ring gasket is extruded by two flanges, the first ring-shaped notch and the ring half-notch can play the role of balancing dynamic stress together, and under the same pressure condition, the first ring-shaped notch positioned on the outer side can allow the ring half-notch to bend to a certain extent, so that the force is guided to be far away from the welding seam.

In order to realize that the first annular recess can allow the annular half cut to be bent to a certain extent, the aperture radius R1 of the annular recess is preferably 2.5-3 mm and the aperture radius R2 of the annular half cut is preferably 1.5-2 mm in view of aperture size of the annular recess and the aperture size of the annular half cut.

Further, each welding ring half part is provided with a lip edge at the outer edge of the first annular recess, an included angle alpha is formed between the lip edge and the abutting surface, and the included angle alpha is more than or equal to 30 degrees and less than or equal to 40 degrees. The relative lip in the half part of weld ring that sets up is formed with "V" type to increased every half part of weld ring in the extension space of pressurized in-process, increased the pressurized stroke, prevent every half part of weld ring easily with the welding seam fracture and play better sealed effect under impact, pressure vibration, wherein contained angle alpha's angle selection makes half part of each weld ring be in the best elasticity scope, thereby plays stable extension performance.

Likewise, to achieve a better sealing action, it is preferred that each of said welding ring halves is radially inwardly recessed with a second annular recess ending between said first annular recess and the ring half cut. The combination of the first annular recess, the second annular recess and the ring half cut-out allows the weld ring halves to flex to some extent to ensure that the weld joint of the base and the flange can better equalize dynamic stresses over long runs.

In order to achieve different extensibility of the lip and the second annular recess in the radial direction to increase the pressure stroke, it is preferable that a distance d1 between an upper edge of the lip and a distal end of the second annular recess is 8 to 10mm, and a distance d2 between an outer edge of the base and a distal end of the second annular recess is 4 to 5mm.

Compared with the prior art, the utility model has the advantages of: each ring half cut can allow the respective welding ring half to bend at least partially for absorbing radial loads to compensate for radial movement to some extent, while the two welding ring halves arranged in abutment with each other can also be deformed to some extent in the inner hollow space formed by the ring half cuts of the two welding ring halves, thereby compensating for radial loads, so that the welding ring shim is adapted to become larger to compensate for radial movement in the case of high dynamic loads in the flange-inducing device, i.e. differences in radial expansion.

Drawings

FIG. 1 is a schematic structural view of a single welded annular gasket according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

fig. 3 is a partial structure sectional view of the welding ring gasket in the embodiment of the present invention.

Fig. 4 is a structural sectional view of the welding ring gasket arranged between the flanges in the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 4, it is a preferred embodiment of the present invention. The welding ring gasket of the present embodiment comprises two welding ring halves 1 arranged to abut against each other, each welding ring half 1 having a base 11 for abutting against and welding to its corresponding flange, each welding ring half 1 having a corresponding ring half cut 12 in the abutting faces to abut against each other, each ring half cut 12 being able to allow at least partial bending of its welding ring half 1.

In particular, each welding ring half 1 is also provided, in the abutment surfaces abutting against each other, radially outwards from the ring half cut 12, with a first annular recess 13 opening towards the abutment surface. When the welding annular gasket is pressed by two flanges, the first annular notch 13 and the ring half-notch 12 can play a role of balancing dynamic stress, and under the same pressure condition, the first annular notch 13 positioned at the outer side can allow the ring half-notch 12 to bend to a certain extent, so that the force is guided away from the welding seam. The caliber radius R1 of the annular notch of the present embodiment is 2.5mm, and the caliber radius R2 of the ring half-cut 12 is 1.5mm, so that the first annular notch 13 can allow the ring half-cut 12 to bend to a certain extent. In addition, each of the welding ring halves 1 has a lip 131 at the outer edge of the first annular recess 13, an included angle α is formed between the lip 131 and the abutting surface, and α =30 °, and the lips 131 in the welding ring halves 1 which are oppositely arranged are formed into a "V" shape, so that the extension space of each of the welding ring halves 1 in the compression process is increased, the compression stroke is increased, and the welding seam is prevented from being easily broken to play a better sealing role under impact and pressure vibration of each of the welding ring halves 1, wherein the angle of the included angle α is selected to enable each of the welding ring halves 1 to be in the optimal elastic range, thereby exerting stable extension performance. Likewise, to achieve a better sealing action, it is preferred that each welding ring half 1 is radially inwardly indented with a second annular indentation 14, the end of the second annular indentation 14 being located between the first annular indentation 13 and the ring half cut 12. The combination of the first annular recess 13, the second annular recess 14 and the ring half cut 12 allows the welding ring half 1 to bend to a certain extent, so as to ensure that the weld joint of the base 11 and the flange can be better balanced against dynamic stresses during long-term operation.

Finally, in order to achieve a different extensibility of lip 131 and second annular recess 14 in the radial direction, so as to increase the compression stroke, the distance d1 between the upper edge of lip 131 and the end of second annular recess 14 is 10mm, while the distance d2 between the outer edge of base 11 and the end of second annular recess 14 is 5mm.

In summary, the use and welding process of the welding ring gasket is as follows:

(1) welding two welding ring halves 1 which are attached to each other on the corresponding flanges 2 through the base parts 11 to form welding seams;

(2) the lips 131 of two welding ring halves 1 arranged next to one another are welded to one another in a next assembly step and form a ring-shaped connecting section, wherein the quality of the welding seam is important for sealing and the welding seam connecting the two welding ring halves 1 at the lips 131 is referred to as sealing seam 3, the welding seam 4 being arranged radially on the inside and the sealing seam on the outside;

(3) in the case of transport of dangerous or highly dangerous media, it is necessary to ensure that even a minimal bypass flow cannot escape from the flange connection, in which case a wire ring can be provided in the first ring recess as a welding aid to prevent media penetration;

(4) the two welding ring halves 1, which are arranged next to one another, can also be deformed to some extent in the inner hollow space formed by the ring half cutouts 12 of the two, thereby compensating for radial loads, so that the welding ring shim becomes larger in extent to compensate for radial movements in the case of devices which cause high dynamic loads on the flange, i.e. differences in radial expansion; in addition, the "V" shaped annular gap, in which the first annular recess 13 and the lip 131 open out, allows the weld ring half 1 to bend to a certain extent, so that the force is directed away from the sealing joint, which ensures the sealing function of the sealing joint over a long period of operation and in particular better equalization of dynamic stresses.

Claims

1. A welding ring gasket comprising two welding ring halves (1) arranged against each other, each welding ring half (1) having a base (11) intended to rest against its own corresponding flange and to be welded thereto, characterized in that: each half-weld ring (1) has a corresponding half-ring cut (12) in the abutting surfaces abutting against each other, each half-ring cut (12) being able to allow the respective half-weld ring (1) to bend at least partially.

2. The welding ring gasket as set forth in claim 1 wherein: each welding ring half part (1) is further provided with a first annular notch (13) which is opened towards the jointing surface from the ring half cut (12) in the jointing surface jointed with each other along the radial direction.

3. The welding ring gasket as set forth in claim 2 wherein: the caliber radius R1 of the annular notch is 2.5-3 mm, and the caliber radius R2 of the annular half cut (12) is 1.5-2 mm.

4. The welding ring gasket as set forth in claim 3 wherein: each half weld ring (1) has a lip (131) at the outer edge of the first annular recess (13), an included angle alpha is formed between the lip (131) and the abutting surface, and the included angle alpha is more than or equal to 30 degrees and less than or equal to 40 degrees.

5. The welding ring gasket of claim 4 wherein: each of the welding ring halves (1) is radially inwardly recessed with a second annular recess (14), the end of the second annular recess (14) being located between the first annular recess (13) and the ring half cut (12).

6. The welding ring gasket of claim 5 wherein: the distance d1 between the upper edge of the lip (131) and the end of the second annular recess (14) is 8-10 mm, while the distance d2 between the outer edge of the base (11) and the end of the second annular recess (14) is 4-5 mm.