CN205639960U - High temperature flange joint structure - Google Patents

Abstract

The utility model relates to a high temperature flange joint structure, its characterized in that: it mainly comprises a pair of metal clamp, the metal clamp is half circle ring, a pair of metal clamp is mutually supported and is blocked the rim seal of flange, the last ring flange of flange and the surperficial circumference of lower flange dish distribute and have round depthkeeping blind hole, are equipped with the bolt hole corresponding with the depthkeeping blind hole on a pair of metal clamp, and it has the depthkeeping bolt to twist in the bolt hole, the inboard recess bottom of metal clamp is equipped with the rectangular cross section groove that two circumference were arranged, two the rectangular cross section inslots in the inboard recess bottom of a pair of metal clamp all are equipped with O type sealing washer, and two O type sealing washers touch with the crowded compacting sealing -in of lateral surface of last ring flange and lower flange dish respectively, through connecting plate and connecting bolt fixed connection between a pair of metal clamp. This connection structure can be applied to complex operating condition such as high temperature, high pressure, vibrations, keeps good leakproofness for a long time, the effectual leakage that prevents the flange.

Description

A high temperature flange connection structure

technical field

The utility model relates to the field of flange sealing structures, in particular to a high-temperature flange connection structure.

Background technique

The flange sealing structure is widely used in petrochemical industry because of its easy disassembly and assembly. Because many fluids handled by chemical plants are flammable, explosive, toxic or corrosive working media, and usually have pressure and temperature, once leakage occurs, it will cause material loss and energy loss, resulting in environmental pollution, and production cannot be carried out normally, increasing Unplanned maintenance and downtime, even endangering human health and life safety and other consequences. In the traditional flange sealing structure, the bolts are subject to tensile loads, and they are prone to loosening under complex working conditions such as high temperature, high pressure, and vibration, resulting in insufficient pretightening force of the gasket and leakage.

Utility model content

In view of the above technical problems, the purpose of this utility model is to provide a high-temperature flange connection structure, which can be applied to complex working conditions such as high temperature, high pressure, vibration, etc., maintain good sealing performance for a long time, and effectively prevent flange leakage .

For realizing above-mentioned purpose, the technical scheme that the utility model takes is:

A high-temperature flange connection structure, characterized in that it is mainly composed of a pair of metal clamps, the metal clamps are semi-circular, and a groove with a rectangular cross section is opened on the inner side of the metal clamps, and the pair of metal clamps are connected to each other. Cooperate to seal and clamp the edge of the flange; the surface of the upper flange and the lower flange of the flange is distributed with a circle of blind holes with a fixed depth in the circumferential direction, and the pair of metal clamps are provided with blind holes with a fixed depth Corresponding bolt holes, the bolt holes are screwed with depth-fixing bolts, and the ends of the depth-fixing bolts are pressed against the bottom of the blind hole of fixed depth; the bottom of the inner groove of the metal clamp is provided with two circumferentially arranged rectangular cross-section grooves, one O-shaped sealing rings are provided in the two rectangular cross-section grooves at the bottom of the inner groove of the metal clamp, and the two O-shaped sealing rings are respectively in extrusion and sealing contact with the outer surfaces of the upper flange and the lower flange; the metal The outer sides of both ends of the clamp are provided with connecting plates, and the connecting plates are provided with bolt holes, and a pair of metal clamps are fixedly connected through the connecting plates and the connecting bolts.

Matching grooves and protrusions are respectively provided on the end faces of the two ends of the metal clip, and the grooves and protrusions are axially distributed, and strip-shaped pads are also arranged between the grooves and the protrusions.

The beneficial effects obtained by the utility model are: the connection structure in the utility model can be applied to complex working conditions such as high temperature, high pressure, vibration, etc., maintain good sealing performance for a long time, and effectively prevent flange leakage. Among them, the fixed-depth bolts used for pre-tightening on the metal clamp are subjected to compressive loads instead of traditional tensile loads, and the relaxation of general high-temperature bolts under compression conditions is less than that under tension conditions, which is different from the traditional flange sealing structure. Compared with the service life of the bolt is improved. The bolt positioning hole of the flange is a blind hole with a fixed depth and no through hole, which enhances the strength and rigidity of the flange, and can be connected by large-diameter bolts, which can reduce the bearing capacity of the bolts and increase the pressing force of the gasket to ensure its connection. Tightness. The inner side of the metal clamp is installed with an O-ring as the second seal. The secondary seal structure makes the sealing effect of the flange better and reduces the number of unplanned maintenance and shutdowns.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the utility model (ie, a schematic cross-section).

Fig. 2 is a schematic top view of the utility model.

In the figure: 1—Connecting plate, 2—Metal clamp, 3—Fixed depth bolt, 4—Anti-loosening gasket, 5—Upper flange, 6—O-ring, 7—Rectangular section groove, 13—Pad Sheet, 14—lower flange, 15—strip pad, 16—connecting bolt, 17—deep blind hole.

detailed description

In order to better understand the utility model, the technical solution of the utility model will be further described below in conjunction with the embodiments and accompanying drawings (as shown in Figures 1 and 2).

A high-temperature flange connection structure, which is mainly composed of a pair of metal clamps 2, the metal clamps 2 are semi-circular, and a groove with a rectangular cross-section is opened on the inner side (that is, the cross-section of the metal clamp 2 is "［" type), the pair of metal clamps 2 cooperate with each other to seal the edge of the flange (the flange is composed of the upper flange 5, the lower flange 14 and the gasket 13) (that is, the edge of the flange completely sealed); the surfaces of the upper flange 5 and the lower flange 14 of the flange (that is, the upper surface of the upper flange 5 and the lower surface of the lower flange 14) are distributed in a circle Deep blind holes 17, the pair of metal clamps 2 are provided with bolt holes corresponding to the fixed depth blind holes 17 (that is, corresponding to the number, position, and size), and the fixed depth bolts 3 (deep depth bolts) are screwed in the bolt holes. An anti-loosening gasket 4 is provided between the bolt 3 and the metal clamp 2), and the end of the depth-fixing bolt 3 is pressed against the bottom of the depth-fixing blind hole 17 (the flanges of the upper flange 5 and the lower flange 14 are The surface of the disc is processed with fixed-depth blind holes 17, and after the metal clamp 2 clamps the upper flange 5 and the lower flange 14, the pre-tightening force is provided for the gasket 13 through the fixed-depth bolts 3 to form a first-level seal) The bottom of the inner groove of the metal clip 2 is provided with two circumferentially arranged rectangular section grooves 7, and a pair of metal clips 2 are provided with O-shaped sealing rings 6 in the two rectangular section grooves 7 at the bottom of the inner groove. The two O-rings 6 are respectively squeezed and sealed with the outer surfaces of the upper flange 5 and the lower flange 14 (the O-rings 6 are installed on the inner side of the metal clamp 2 and squeezed on the upper side after the installation is completed). The outside of the flange of the blue plate 5 and the lower flange 14 to form a second-level seal); the outer sides of the two ends of the metal clamp 2 are provided with a connecting plate 1, and a bolt hole is opened on the connecting plate 1, and a pair of metal The clamps 2 are fixedly connected by the connecting plate 1 and the connecting bolt 16 .

The end faces of the two ends of the metal clamp 2 are respectively provided with matching grooves and protrusions, and the grooves and protrusions are axially distributed, and a strip pad 15 (that is, a groove) is also provided between the grooves and the protrusions. A strip gasket 15 is provided in the groove for sealing).

The above descriptions are only application examples of the utility model, and of course the scope of rights of the utility model cannot be limited with this. Therefore, equivalent changes made according to the patent scope of the utility model still belong to the protection scope of the utility model.

Claims (2)

1. a high-temperature flange attachment structure, it is characterized in that: it is mainly made up of a pair metal clip (2), described metal clip (2) is semi-circular shape, offers the groove that cross section is rectangle inside it, and the pair of metal clip (2) cooperates and blocked by the edge seal of flange；The upper flange plate (5) of described flange and the surface of lower flange (14) is circumferentially distributed the deep blind hole of a delineation (17), the pair of metal clip (2) is provided with the bolt hole corresponding with depthkeeping blind hole (17), being screwed with depthkeeping bolt (3) in bolt hole, depthkeeping bolt (3) termination pushes against depthkeeping blind hole (17) bottom；Two square-section grooves (7) circumferentially it are provided with bottom described metal clip (2) inboard groove, being equipped with O RunddichtringO (6) bottom a pair metal clip (2) inboard groove in two square-section grooves (7), the lateral surface crush seal with upper flange plate (5) and lower flange (14) respectively of two O RunddichtringOs (6) contacts；The outside at described metal clip (2) two ends is equipped with connecting plate (1), and connecting plate offers bolt hole on (1), connects by connecting plate (1) and connecting bolt (16) are fixing between a pair metal clip (2).

A kind of high-temperature flange attachment structure the most according to claim 1, it is characterized in that: on the end face at described metal clip (2) two ends, be respectively equipped with the groove and projection being mutually matched, described groove and protruding axial distribution, be additionally provided with bar pad (15) between groove and projection.