CN215294017U - Flange connection sealing structure - Google Patents
Flange connection sealing structure Download PDFInfo
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- CN215294017U CN215294017U CN202120994222.5U CN202120994222U CN215294017U CN 215294017 U CN215294017 U CN 215294017U CN 202120994222 U CN202120994222 U CN 202120994222U CN 215294017 U CN215294017 U CN 215294017U
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Abstract
The utility model belongs to the technical field of pressure vessel and pipeline flange are connected, in particular to flange joint seal structure, lower flange and last flange based on interconnect, the connection terminal surface of lower flange and last flange all is equipped with the gasket ring, and two radial inside and outside gasket rings arrange, accompany cylindric gasket between two gasket rings. The utility model discloses separate gasket reaction force from the flange face, reduce the bolt load, slow down bolt creep deformation, improve the sealing reliability. And the sealing surface is separated from the flange body structure, so that the cutting processing amount of the flange is reduced.
Description
Technical Field
The utility model belongs to the technical field of pressure vessel and pipeline flange are connected, in particular to flange joint seal structure.
Background
Now, pressure vessel flange and pipe flange connections can be divided into three categories from the structural and sealing principles: forced flange joint seals, semi-self-clinching seals and self-clinching seals. All three seals rely on the bolt to apply a greater pressure to the sealing gasket to form the initial seal. Although the use time is long, the technology is mature, and the experience is rich, a plurality of problems are still not solved. For example, flanges tend to deform due to insufficient stiffness resulting in seal failure, potential creep deformation of the bolt material at high temperatures resulting in stress relaxation of the bolts resulting in seal failure, deterioration of gasket material properties resulting in failure, and the like. In the existing flange connection design method, the pressing force required by gasket deformation and the pressure of medium force acting on the flange sealing surface are calculated as bolt load, and the bolt diameter and the flange thickness are calculated according to the load.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a flange joint seal structure separates gasket reaction force from the flange face, reduces bolt load, slows down bolt creep deformation, improves the sealing reliability.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a flange joint seal structure, lower flange and last flange based on interconnect, its characterized in that: the connection terminal surface of lower flange and last flange all is equipped with the gasket ring, and two gasket rings are radially arranged inside and outside, accompany cylindric gasket between two gasket rings.
Furthermore, the connecting end faces of the lower flange and the upper flange are respectively provided with an inner gasket ring and an outer gasket ring, and the inner gasket ring and the outer gasket ring are arranged radially inwards and outwards; the inner gasket ring is of an L-shaped section structure, and the horizontal edge of the inner gasket ring is welded with the connecting end face of the lower flange; the outer gasket ring is of an L-shaped cross section structure, and the horizontal edge of the outer gasket ring is welded with the connecting end face of the upper flange; and a gap for accommodating the gasket is formed between the vertical edges of the inner gasket ring and the outer gasket ring.
Furthermore, a plurality of screw through holes which are uniformly distributed are formed in the vertical edge of the outer gasket ring, through holes are formed in the positions, corresponding to the screw through holes, of the gaskets, screw blind holes are formed in the positions, corresponding to the screw through holes, of the inner gasket ring, and the inner gasket ring and the outer gasket ring are connected through the screw through holes and the screw blind holes in a matched mode through a plurality of screws.
Furthermore, an annular convex edge is arranged on the inner side face of the vertical side of the inner gasket ring, the convex edge is over against the screw blind hole, and the screw blind hole extends into the convex edge; or a plurality of bosses are arranged on the inner side surface of the vertical side of the inner gasket ring, the bosses correspond to the screw blind holes one to one, and the screw blind holes penetrate into the bosses.
Furthermore, the upper end face of the vertical side of the inner gasket ring is in clearance fit with the horizontal side of the outer gasket ring, and the lower end face of the vertical side of the outer gasket ring is in clearance fit with the horizontal side of the inner gasket ring.
Furthermore, the upper end face and the lower end face of the gasket are in clearance fit with the horizontal edge of the outer gasket ring and the horizontal edge of the inner gasket ring respectively.
Furthermore, the sealing structure further comprises an intermediate ring, the intermediate ring is clamped between the connecting end faces of the lower flange and the upper flange, and an axial through hole matched with the bolt and the nut is formed in the intermediate ring.
Further, the inner side surface of the middle ring is in contact with the outer side surface of the vertical edge of the outer gasket ring.
Furthermore, the middle ring is provided with a plurality of radial through holes which are through in the radial direction and used for screws to pass through.
Furthermore, the lower flange and the upper flange are connected through a plurality of bolts and nuts, the bolts and the nuts are circumferentially and uniformly arranged, and the bolts, the bolts and the nuts are distributed in a staggered mode.
Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model discloses separate gasket reaction force from the flange face, reduce the bolt load, slow down bolt creep deformation, improve the sealing reliability. And the sealing surface is separated from the flange body structure, so that the cutting processing amount of the flange is reduced.
Drawings
Fig. 1 is a schematic view of a flange connection seal structure in the embodiment.
Fig. 2 is a schematic sectional view a-a in fig. 1.
Fig. 3 is an enlarged schematic view of a portion a in fig. 2.
Fig. 4 is a schematic sectional view B-B in fig. 1.
Fig. 5 is an enlarged schematic view of a portion B in fig. 4.
FIG. 6 is a schematic view of an outer gasket ring in an embodiment.
FIG. 7 is a schematic view of an embodiment of an inner shim ring.
Fig. 8 is a schematic view of an upper flange (or lower flange) in an embodiment.
In the figure, 1, a lower flange; 2. an intermediate ring; 3. an upper flange; 4. a bolt and a nut; 5. sealing the cavity; 6. an outer gasket ring; 7. a gasket; 8. an inner shim ring; 9. and (4) screws.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
A flange connection sealing structure is based on a lower flange 1 and an upper flange 3 which are connected with each other (the structures of the lower flange 1 and the upper flange 3 can be completely the same), as shown in figure 1, the lower flange 1 and the upper flange 3 are connected through a plurality of bolts and nuts 4, and the plurality of bolts and nuts 4 are circumferentially and uniformly arranged.
As shown in fig. 2 and 4, the sealing structure further comprises an intermediate ring 2, wherein the intermediate ring 2 is clamped between the connecting end surfaces of the lower flange 1 and the upper flange 3, and the intermediate ring 2 is provided with an axial through hole matched with the bolt and the nut 4. A plurality of bolts and nuts 4 connect the intermediate ring 2, the upper flange 3 and the lower flange 1 together.
As shown in fig. 2, 3, 4 and 5, the connection end surfaces of the lower flange 1 and the upper flange 3 are respectively provided with an inner gasket ring 8 and an outer gasket ring 6 with L-shaped cross-sectional structures, the horizontal edges of the inner gasket ring 8 and the outer gasket ring 6 are respectively welded with the corresponding connection end surfaces of the flanges, the vertical edges are radially arranged inside and outside to form a gap for accommodating the gasket 7, and the cylindrical gasket 7 is clamped in the gap.
As shown in fig. 1, 4 and 5, a plurality of uniformly arranged screw through holes are arranged on the vertical side of the outer gasket ring 6, through holes are arranged at the positions of the gasket 7 corresponding to the screw through holes, screw blind holes are arranged at the positions of the inner gasket ring 8 corresponding to the screw through holes, the inner gasket ring 8 and the outer gasket ring 6 are connected through a plurality of screws 9 matched with the screw through holes and the screw blind holes, and the plurality of screws 9 and the plurality of bolts and nuts 4 are distributed in a staggered manner. And the inner side surface of the middle ring 2 is in contact with the outer side surface of the vertical edge of the outer gasket ring 6, and the middle ring 2 is also provided with a plurality of radial through holes which are radially penetrated and used for the screws 9 to pass through.
As shown in fig. 3 and 5, an annular rib is arranged on the inner side surface of the vertical side of the inner gasket ring 8, the rib is opposite to the screw blind hole, and the screw blind hole extends into the rib; or a plurality of cylindrical bosses are arranged on the inner side surface of the vertical side of the inner gasket ring 8, the bosses correspond to the screw blind holes one by one, and the screw blind holes penetrate into the bosses. The design of the convex ribs or the convex bosses is used for increasing the thickness of the vertical edge of the inner gasket ring 8 and providing a screw blind hole with enough depth. The upper end face of the vertical edge of the inner gasket ring 8 is in clearance fit with the horizontal edge of the outer gasket ring 6, and the lower end face of the vertical edge of the outer gasket ring 6 is in clearance fit with the horizontal edge of the inner gasket ring 8. The upper end surface and the lower end surface of the gasket 7 are in clearance fit with the horizontal edge of the outer gasket ring 6 and the horizontal edge of the inner gasket ring 8 respectively.
The design scheme of the flange connection sealing structure is as follows:
1. gasket design
The gasket 7 is basically cylindrical, as shown in fig. 3 and 5, circular through holes are uniformly distributed on the cylindrical surface, the hole diameter is slightly larger than that of an inner hexagonal socket head cap screw (i.e. the screw 9), and the number of the inner hexagonal socket head cap screw can be 1-2 times that of a bolt (hereinafter, the bolt and the bolt in the nut 4). The thickness of the gasket 7 is 1.0-3.0mm, and the height is 20-40 mm. The gasket 7 is made of a non-metal material, a metal material or a composite material (of non-metal and metal).
2. Shim ring design
The gasket rings (the inner gasket ring 8 and the outer gasket ring 6) are made of metal materials resistant to medium corrosion. The basic structure of the gasket ring is shown in figures 6 and 7. The diameter of the phi d1 and other circumferences can be determined by referring to the size of the sealing surface of the existing flange. The remaining dimensions are as follows:
δ2＝δ3＝4mm
δ1＝6mm
δ4＝2-3mm。
3. structural design of flange
The flange of the scheme can be still divided into a plate type flange, a neck flange, a long neck flange and the like. The connection mode of the flange and the equipment cylinder or the pipeline is divided into flat welding and butt welding. However, the flange sealing end face no longer serves as a sealing face, and the two flanges (lower flange 1 and upper flange 3) which are connected in a mating manner are identical in structure. Wherein the flange structure of the plate-type container is shown in figure 8.
The bolt load is: w is 0.25pcπD3 2，
In the formula (I), the compound is shown in the specification,
pcin order to calculate the pressure, the pressure is calculated,
D3the cavity diameter is sealed for the flange.
The number of the bolts is n, and the diameters of the bolts are as follows:
wherein [ sigma ]]b tThe allowable stress for the bolt material at the design temperature.
The shear strength of the bolt should also be calculated for high pressure sealing. The shear load experienced by the bolt is calculated as follows: q ═ pcπD4l，
In the formula (I), the compound is shown in the specification,
D4is the inner diameter of the inner shim ring 8,
l is the height of the inner shim ring 8.
The required diameter of the bolt to be sheared is:
wherein [ tau ] is]b tThe shear allowable stress for the bolt material at the design temperature.
The larger of the two diameters is the diameter of the bolt.
4. Flange strength design
The external moment of the flange is caused by the axial force of the internal pressure acting on the inner diameter section and the acting force of the flange end face, and the two form a force couple.
The external moment is:
the stress of the flange is calculated according to a Waters method, see GB150-2011 pressure vessel or other relevant standards, and is not described any more.
Example implementation method design requirements are as follows:
(1) the upper and lower flanges and the intermediate ring are processed according to the prior art, and no particular description is given. The inner and outer gasket rings are machined differently according to the diameter. When the diameter of the flange is small, the inner gasket ring and the outer gasket ring can be formed by cutting round bar materials. When the large-diameter pipeline or equipment flange is used, the vertical edge and the horizontal edge of the inner gasket ring and the outer gasket ring can be processed by adopting a welding method. The flange used for processing the threaded hole in the middle of the inner gasket ring can be a single cylindrical boss or a convex rib with the whole circumference, and the flange and the vertical edge are obtained by cutting a thick-wall circular ring. The inner and outer gasket rings are integrated and then the screw through holes and the screw blind holes are processed.
(2) The positions of the screw through holes, the screw blind holes and the through holes on the intermediate ring 2 on the circumference are completely consistent from the enlarged view B in FIG. 5, so that the positions of the inner and outer gasket rings relative to the flange are determined by marking when the flange is welded with the inner and outer gasket rings. And respectively welding the two flanges with the upper gasket ring and the lower gasket ring according to the marking positions. As can be seen from the medium leakage path indicated by the arrow in the enlarged view a in fig. 3, the inner weld seam of the flange to the gasket ring also serves as a seal, so that the quality of the weld must be ensured.
(3) Assembling the upper flange, the lower flange, the middle ring 2 and the gasket 7 which are welded with the gasket ring according to the figure, and locking by using 4 bolts and nuts 4; and (4) trial installation is carried out on the socket head cap screws one by one. Only if all the screws are successfully installed will the aforesaid operation be indicated as correct and reasonable. Then the equipment cylinder, the end socket or the pipe are respectively assembled with the upper flange and the lower flange (not disassembled) and relative position marks are made. And (4) disassembling the upper flange and the lower flange, and respectively welding the upper flange and the lower flange with the cylinder, the seal head or the pipe according to the marked direction.
(4) And (3) tightening the bolt according to the design load of the bolt, screwing the first inner hexagonal socket head screw into the inner gasket ring, and locking the inner gasket ring 8, the gasket 7 and the outer gasket ring 6 to realize initial sealing. After the pressure is increased, the medium pressure acts on the inner side surface of the inner gasket ring 8, and the gasket is further pressed. The medium pressure is transmitted to the intermediate ring 2 via the shim ring, and the intermediate ring 2 is transmitted to the screw. In principle, the sealing solution is of the self-tightening type.
The advantages and effects of the above scheme are: by adopting the scheme to design the flange, the quality of the flange can be greatly reduced, the structure of the flange is simplified, the secondary processing of the flange is avoided, and the sealing is reliable. The creep deformation of the bolt during high-temperature and high-pressure sealing is reduced by the smaller bolt load, so that the scheme is particularly suitable for high-temperature and high-pressure sealing.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a flange joint seal structure, lower flange (1) and last flange (3) based on interconnect which characterized in that: the connection end face of the lower flange (1) and the upper flange (3) is provided with gasket rings, the two gasket rings are arranged radially inside and outside, and a cylindrical gasket (7) is clamped between the two gasket rings.
2. The flange connection seal structure according to claim 1, wherein: the connecting end faces of the lower flange (1) and the upper flange (3) are respectively provided with an inner gasket ring (8) and an outer gasket ring (6), and the inner gasket ring (8) and the outer gasket ring (6) are arranged radially inwards and outwards; the inner gasket ring (8) is of an L-shaped section structure, and the horizontal edge of the inner gasket ring is welded with the connecting end face of the lower flange (1); the outer gasket ring (6) is of an L-shaped cross section structure, and the horizontal edge of the outer gasket ring is welded with the connecting end face of the upper flange (3); a gap for accommodating the gasket (7) is formed between the vertical edges of the inner gasket ring (8) and the outer gasket ring (6).
3. The flange connection seal structure according to claim 2, wherein: the vertical limit of outer gasket ring (6) is equipped with a plurality of evenly arranged's screw through-hole, gasket (7) are equipped with the through-hole with the screw through-hole department of corresponding, interior gasket ring (8) are equipped with the screw blind hole with the screw through-hole department of corresponding, cooperate through a plurality of screws (9) between interior gasket ring (8) and outer gasket ring (6) screw through-hole and screw blind hole are connected.
4. The flange connection seal structure according to claim 3, wherein: the inner side surface of the vertical side of the inner gasket ring (8) is provided with an annular convex edge, the convex edge is over against the screw blind hole, and the screw blind hole extends into the convex edge; or a plurality of bosses are arranged on the inner side surface of the vertical side of the inner gasket ring (8), the bosses correspond to the screw blind holes one by one, and the screw blind holes penetrate into the bosses.
5. The flange connection seal structure according to claim 3, wherein: the upper end face of the vertical edge of the inner gasket ring (8) is in clearance fit with the horizontal edge of the outer gasket ring (6), and the lower end face of the vertical edge of the outer gasket ring (6) is in clearance fit with the horizontal edge of the inner gasket ring (8).
6. The flange connection seal structure according to claim 3, wherein: the upper end face and the lower end face of the gasket (7) are in clearance fit with the horizontal edge of the outer gasket ring (6) and the horizontal edge of the inner gasket ring (8) respectively.
7. The flange connection seal structure according to claim 3, wherein: the sealing structure further comprises an intermediate ring (2), the intermediate ring (2) is clamped between the connecting end faces of the lower flange (1) and the upper flange (3), and an axial through hole matched with the bolt and the nut (4) is formed in the intermediate ring (2).
8. The flange connection seal structure according to claim 7, wherein: the inner side surface of the middle ring (2) is contacted with the outer side surface of the vertical edge of the outer gasket ring (6).
9. The flange connection seal structure according to claim 7, wherein: the middle ring (2) is provided with a plurality of radial through holes which are through in the radial direction and used for screws (9) to pass through.
10. The flange connection seal structure according to claim 3, wherein: the lower flange (1) is connected with the upper flange (3) through a plurality of bolts and nuts (4), the plurality of bolts and the plurality of nuts (4) are circumferentially and uniformly arranged, and the plurality of screws (9) and the plurality of bolts and the plurality of nuts (4) are distributed in a staggered mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120994222.5U CN215294017U (en) | 2021-05-11 | 2021-05-11 | Flange connection sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120994222.5U CN215294017U (en) | 2021-05-11 | 2021-05-11 | Flange connection sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215294017U true CN215294017U (en) | 2021-12-24 |
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ID=79539826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120994222.5U Active CN215294017U (en) | 2021-05-11 | 2021-05-11 | Flange connection sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215294017U (en) |
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2021
- 2021-05-11 CN CN202120994222.5U patent/CN215294017U/en active Active
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