CN210510270U

CN210510270U - Large-scale flange seal structure

Info

Publication number: CN210510270U
Application number: CN201921458933.XU
Authority: CN
Inventors: 于聪聪; 周兴
Original assignee: Panzhihua Pangang Group Design & Research Institute Co ltd
Current assignee: Panzhihua Pangang Group Design & Research Institute Co ltd
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-05-12
Anticipated expiration: 2029-09-03

Abstract

The utility model belongs to the technical field of sealing connection, a sealed better large-scale flange seal structure of effect is specifically disclosed. The large flange sealing structure comprises an upper flange and a lower flange; the lower end surface of the flange of the upper flange is step-shaped and comprises an inner end surface, a sealing end surface and an outer end surface which are distributed from low to high; the lower flange is arranged on the lower side of the upper flange, an annular sealing groove plate is arranged on the upper end face of the flange of the lower flange, at least two annular sealing grooves are formed in the top of the annular sealing groove plate, and sealing filler is arranged in each annular sealing groove. The flange lower end face of the upper flange is set to be of a step-shaped structure, the sealing end face of the upper flange is matched with the annular sealing groove plate arranged on the flange upper end face of the lower flange, sealing filler filled in the annular sealing grooves after the upper flange and the lower flange are connected is guaranteed to be tightly attached to the sealing end face, the sealing effect is greatly improved, the safety coefficient is increased, and the requirement of the nominal diameter larger than 2m for sealing the flange can be met.

Description

Large-scale flange seal structure

Technical Field

The utility model belongs to the technical field of sealing connection, concretely relates to large-scale flange seal structure.

Background

At present, the flange connection has formed a relevant standard, the standard is steel flange pipe (HG20592-2018), and the standard comprises a flange and a sealing ring. The standard is to ensure the sealing effect of connection, and the maximum nominal diameter of a standard series corresponding to the nominal pressure PN less than 1.0MPa is DN2000 mm; the maximum nominal diameter of the standard series corresponding to the nominal pressure PN of more than or equal to 1.0MPa is DN600 mm. The sealing performance of the large flange connection with the nominal diameter DN larger than 2000mm cannot be guaranteed by adopting the existing standard connection structure for connection without standardization. Therefore, a nonstandard design is required, and especially, the sealing performance requirement and the machining and manufacturing cost of the sealing ring and other factors need to be considered for the design of the sealing structure, which becomes a great problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a large-scale flange seal structure that sealed effect is better.

The utility model provides a technical scheme that its technical problem adopted is: the large-scale flange sealing structure comprises an upper flange and a lower flange, wherein the nominal diameters DN of the upper flange and the lower flange are both larger than 2000 mm; the lower end surface of the flange of the upper flange is step-shaped and comprises an inner end surface, a sealing end surface and an outer end surface which are distributed from low to high; the lower flange is arranged on the lower side of the upper flange, an annular sealing groove plate corresponding to the sealing end face is arranged on the upper end face of the flange of the lower flange, at least two annular sealing grooves are formed in the top of the annular sealing groove plate, sealing filler is arranged in each annular sealing groove, and the upper end face of the sealing filler is attached to the sealing end face.

Further, the sealing filler is made of flexible graphite braided filler.

Further, the annular sealing groove plate is connected with the lower flange in a welding mode.

Further, the cross section of the annular sealing groove is rectangular.

Further, after the upper flange and the lower flange are connected and locked through the connecting piece, the distance between the inner end surface and the upper end surface of the flange of the lower flange is a safe distance A, the distance between the sealing end surface and the upper end surface of the annular sealing groove plate is a compression limit distance B, and the compression limit distance B is smaller than the safe distance A.

The utility model has the advantages that: the flange lower end face of the upper flange is set to be of a step-shaped structure, the sealing end face of the upper flange is matched with the annular sealing groove plate arranged on the flange upper end face of the lower flange, sealing filler filled in the annular sealing grooves after the upper flange and the lower flange are connected is guaranteed to be tightly attached to the sealing end face, the sealing effect is greatly improved, the safety coefficient is increased, and the requirement of the nominal diameter larger than 2m for sealing the flange can be met. Meanwhile, the lower flange is formed by welding the annular sealing groove plate and the main body plate thereof, a large amount of processing cost can be saved, the sealing practicability of the non-standard flange of the large-scale furnace body in the industries such as chemical engineering, equipment and the like is high, the flange can be widely popularized and applied, and the prospect is wide.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of an embodiment of an annular sealing groove plate filled with sealing filler;

labeled as: the sealing structure comprises an upper flange 10, an inner end surface 11, a sealing end surface 12, an outer end surface 13, sealing filler 20, a lower flange 30, a flange upper end surface 31, an annular sealing groove plate 40 and an annular sealing groove 41.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, the large flange sealing structure comprises an upper flange 10 and a lower flange 30, wherein nominal diameters DN of the upper flange 10 and the lower flange 30 are both larger than 2000 mm; the lower end surface of the flange of the upper flange 10 is step-shaped and comprises an inner end surface 11, a sealing end surface 12 and an outer end surface 13 which are distributed from low to high; the lower flange 30 is arranged on the lower side of the upper flange 10, an annular sealing groove plate 40 corresponding to the sealing end face 12 is arranged on the flange upper end face 31 of the lower flange 30, at least two annular sealing grooves 41 are arranged at the top of the annular sealing groove plate 40, sealing filler 20 is arranged in each annular sealing groove 41, and the upper end face of the sealing filler 20 is attached to the sealing end face 12.

Set up to step-like structure through the flange lower terminal surface with upper flange 10, not only can strengthen the structural strength of junction, extension joint seam length, do benefit to and fix a position when upper flange 10 and lower flange 30 are connected moreover, and can also make the seal face 12 of upper flange 10 and the annular seal frid 40 cooperation of setting on the flange up end 31 of lower flange 30, guaranteed upper and lower flange and connected the back and filled seal packing 20 and the inseparable laminating of seal face 12 in a plurality of annular seal groove 41, guarantee sealed effect.

In order to further improve the sealing effect, the sealing end face 12 is preferably provided with a roughened surface or a frosted surface to increase the sealing contact area and the anti-slip effect. The sealing filler 20 can be a variety of sealing materials, and can be selected according to the requirements of the sealing ring on the working environment and the use pressure, and is preferably made of flexible graphite woven filler (JB/T7370-.

The annular sealing groove plate 40 can be integrally processed with the lower flange 30, and can also be connected in a matching way or connected through a connecting piece; the annular sealing groove plate 40 is preferably welded to the lower flange 30 to save machining costs. The cross-section of annular seal groove 41 may be of various configurations, for example: inverted trapezoid, semicircle, dovetail groove, etc., preferably rectangular; the number of annular seal grooves 41 is plural, and is generally determined by corresponding calculation according to the characteristics of specific transmission media and process requirements.

Specifically, as shown in fig. 2, a height g of a cross section of seal packing 20 is greater than a depth h of annular seal groove 41, and a width k of the cross section of seal packing 20 is smaller than a width W of annular seal groove 41.

In order to further increase the safety factor, as shown in fig. 1, after the upper flange 10 and the lower flange 30 are connected and locked by the connecting member, the distance between the inner end surface 11 and the flange upper end surface 31 of the lower flange 30 is a safety distance a, the distance between the sealing end surface 12 and the upper end surface of the annular sealing groove plate 40 is a compression limit distance B, and the compression limit distance B is smaller than the safety distance a.

Claims

1. The large-scale flange sealing structure comprises an upper flange (10) and a lower flange (30), wherein the nominal diameters DN of the upper flange (10) and the lower flange (30) are both larger than 2000 mm; the method is characterized in that: the lower end surface of the flange of the upper flange (10) is step-shaped and comprises an inner end surface (11), a sealing end surface (12) and an outer end surface (13) which are distributed from low to high; lower flange (30) set up the downside at last flange (10), be provided with on flange up end (31) of lower flange (30) with sealed terminal surface (12) corresponding annular seal frid (40), the top of annular seal frid (40) is equipped with two at least annular seal grooves (41), all is provided with in each annular seal groove (41) and seals filler (20), the up end and the sealed terminal surface (12) of sealing filler (20) are laminated mutually.

2. A large flange seal according to claim 1, wherein: the sealing filler (20) is made of flexible graphite woven filler.

3. A large flange seal according to claim 1, wherein: the annular sealing groove plate (40) is connected with the lower flange (30) in a welding mode.

4. A large flange seal according to claim 1, wherein: the cross section of the annular sealing groove (41) is rectangular.

5. A large flange seal according to claim 1, 2, 3 or 4, wherein: after the upper flange (10) and the lower flange (30) are connected and locked through the connecting piece, the distance between the inner end face (11) and the flange upper end face (31) of the lower flange (30) is a safe distance A, the distance between the sealing end face (12) and the upper end face of the annular sealing groove plate (40) is a compression limit distance B, and the compression limit distance B is smaller than the safe distance A.