CN204628872U - A kind of stepped tooth contact flange - Google Patents

Abstract

The utility model relates to a kind of stepped tooth contact flange, comprise upper flange, lower flange and wave tooth spacer, the profile of tooth of described wave tooth spacer is trapezoidal, the sealing surface of described upper flange and lower flange is respectively equipped with the trapezoidal toothed groove matched with the upper surface of wave tooth spacer and lower surface, the sealing surface of described upper flange and lower flange does not arrange boss.This flange effectively can reduce moment of flexure and stress and pad not easily offsets, good airproof performance, long working life.

Description

A trapezoidal tooth contact flange

technical field

The utility model relates to a trapezoidal tooth contact flange.

Background technique

With the increasingly prominent contradiction between economic development, energy supply and environmental protection, "safety, high efficiency, environmental protection, economy" has become the direction of industrial development, which is mainly reflected in the safe operation of high-temperature equipment and the tight connection system in the petrochemical industry Sexually.

Flange connection is widely used in the connection of pressure pipes and pressure vessels in the petrochemical industry due to its easy disassembly and assembly. When it is under high temperature and high pressure for a long time, the flange connection is prone to leakage and failure. Existing flanges often have the following problems: Disadvantages: 1) For flanges with bosses on the sealing surface (such as concave-convex flanges and grooved flanges), the gasket is fixed in the groove and is not easy to shift, but the bending moment generated by the flange is large, which causes the gasket to be stressed. Uneven force, flange deflection, resulting in leakage. Under high temperature and high pressure, the flange sealing surface, gasket and bolts will all be subject to great stress, resulting in the creep of the materials of the various parts in the flange connection, resulting in pipeline failure. The flange connection system is loose, which eventually leads to leakage failure; 2) Flanges without bosses on the flange end (such as flat flanges and raised face flanges) have a small bending moment, but because the gasket is not fixed in the groove, So it is easy to shift and cause leakage.

Utility model content

The purpose of the utility model is to provide a trapezoidal tooth contact flange, the flange can effectively reduce the bending moment and stress, the gasket is not easy to shift, the sealing performance is good, and the working life is long.

The technical scheme of the utility model is:

A trapezoidal tooth contact flange, comprising an upper flange, a lower flange and a corrugated tooth gasket, the tooth shape of the corrugated tooth gasket is trapezoidal, and the sealing surfaces of the upper flange and the lower flange are respectively provided with There are trapezoidal tooth grooves matched with the upper surface and the lower surface of the wave-tooth gasket, and no bosses are arranged on the sealing surfaces of the upper flange and the lower flange.

As a further improvement of the utility model, the corrugated gasket is a flexible graphite metal corrugated composite gasket, the main body of the gasket is a metal skeleton, and the upper surface and the lower surface of the metal skeleton are provided with flexible graphite layers.

As a further improvement of the utility model, there is a radial offset between the trapezoidal teeth on the upper and lower surfaces of the corrugated tooth gasket, and the offset is half the tooth pitch.

As a further improvement of the utility model, the upper flange and the lower flange both include a flange plate, a tapered neck and a cylinder connected in sequence, and the flange plate, tapered neck and cylinder are integrated.

As a further improvement of the utility model, bolt holes are provided on the flange plates of the upper flange and the lower flange, and the upper flange and the lower flange are fixed by bolt connection.

The beneficial effects of the utility model are:

1) The utility model is not equipped with a boss, which partially eliminates the bending moment between the connecting hole and the force point of the gasket, and partially eliminates the deflection and creep of the flange due to the bending moment under the high temperature and high pressure environment. The trapezoidal teeth on the upper and lower surfaces cooperate with the trapezoidal tooth grooves on the upper and lower flanges respectively, so that the gasket is not easy to shift.

2) Adopting trapezoidal tooth contact sealing form, compared with ordinary flanges, the effective sealing area is increased, the stress level between the flange sealing surface and the gasket surface is reduced, and the sealing effect is enhanced.

3) The multiple tooth gaps of the flexible graphite metal wave-tooth composite pad form a multi-stage seal, forming a sealing form similar to a labyrinth seal, which can convert the kinetic energy and potential energy of the internal medium into heat energy as much as possible, and reduce the pressure of the internal medium. Pressure can slow down or even eliminate leakage, and flexible graphite has high adsorption force (can absorb oil, organic molecules, etc.) and has good sealing performance.

4) The cylinder (that is, the socket) and the flange are integrated to avoid leakage caused by the defect of the butt welding joint, and the structure is simple and easy to use.

5) The tapered neck can increase the bearing capacity of the bending moment and improve the bending moment bearing capacity of the flange connection.

6) The radial offset between the trapezoidal teeth on the upper and lower surfaces of the corrugated tooth gasket makes the flexible graphite metal corrugated tooth composite gasket have better compression and rebound performance.

Description of drawings

Fig. 1 is a sectional view of the overall structure of the utility model.

Fig. 2 is an enlarged view of A in Fig. 1 .

In the figure: 1-flange; 2-bolt; 3-taper neck; 4-cylinder; 5-upper flange; 6-flexible graphite metal corrugated composite gasket; 7-lower flange; Trapezoidal tooth groove on sealing surface; 9-upper surface of flexible graphite metal wave-tooth composite gasket; 10-metal skeleton; 11-lower surface of flexible graphite metal wave-tooth composite gasket; 12-trapezoidal tooth shape of lower flange sealing surface groove.

Detailed ways

Below in conjunction with specific embodiment and accompanying drawing, the utility model is further described.

As shown in Figure 1, a trapezoidal tooth contact flange includes an upper flange 5, a lower flange 7 and a wave-tooth gasket, the tooth shape of the wave-tooth gasket is trapezoidal, and the upper flange 5 and The sealing surfaces of the lower flange 7 are respectively provided with trapezoidal toothed grooves matching the upper and lower surfaces of the corrugated gaskets, and the sealing surfaces of the upper flange 5 and the lower flange 7 are not provided with bosses. The utility model is not provided with a boss, which partially eliminates the bending moment between the connection hole and the force point of the gasket, and partially eliminates the deflection and creep of the flange 7 plate 1 due to the bending moment under the high temperature and high pressure environment; the corrugated tooth gasket The trapezoidal teeth on the upper and lower surfaces cooperate with the trapezoidal tooth grooves of the upper and lower flanges 7 respectively, the gasket is not easy to shift, and the trapezoidal tooth contact sealing form is adopted, which increases the effective sealing area compared with ordinary flanges , reduces the stress level between the flange sealing surface and the gasket surface, and enhances the sealing effect.

The multiple tooth gaps of the corrugated tooth gasket form a multi-stage seal, forming a sealing form similar to a labyrinth seal, which can convert the kinetic energy and potential energy of the internal medium into heat energy as much as possible, reduce the pressure energy of the internal medium, and slow down even Eliminate leakage, as shown in Figures 1 and 2, in this embodiment, the corrugated gasket is a flexible graphite metal corrugated composite gasket 6, the main body of the gasket is a metal skeleton 10, and the upper surface of the metal skeleton 10 Both the surface and the lower surface are provided with a flexible graphite layer. The flexible graphite has a high adsorption force (can absorb oil, organic molecules, etc.) and has good sealing performance.

As shown in Figures 1 and 2, in this embodiment, there is a radial offset between the trapezoidal teeth on the upper and lower surfaces of the flexible graphite metal wave-tooth composite pad 6, and the offset is half the tooth pitch. The radial offset between the trapezoidal teeth on the upper and lower surfaces of the graphite metal corrugated composite pad 6 makes the flexible graphite metal corrugated composite pad 6 have better compression resilience.

As shown in Figure 1, in this embodiment, the upper flange 5 and the lower flange 7 both include a flange 1, a tapered neck 3 and a cylinder 4 connected in sequence, and the flange 1, The tapered neck 3 and the cylinder 4 are integrated. The cylinder 4 (that is, the socket) and the flange 1 are integrated to avoid leakage caused by the defects of the butt welding joint, and the structure is simple and convenient to use; the tapered neck 3 can increase the bearing capacity of the bending moment and improve the flange connection. bending moment capacity. The flanges 1 of the upper flange 5 and the lower flange 7 are provided with holes for bolts 2 , and the upper flange 5 and the lower flange 7 are connected and fixed by the bolts 2 .

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present utility model.

Claims (5)

1. a stepped tooth contact flange, it is characterized in that: comprise upper flange, lower flange and wave tooth spacer, the profile of tooth of described wave tooth spacer is trapezoidal, the sealing surface of described upper flange and lower flange is respectively equipped with the trapezoidal toothed groove matched with the upper surface of wave tooth spacer and lower surface, the sealing surface of described upper flange and lower flange does not arrange boss.

2. a kind of stepped tooth contact flange as claimed in claim 1, is characterized in that: described wave tooth spacer is Expanded graphite metal wave tooth composite pad, and the main body of pad is metal frame, and the upper surface of metal frame and lower surface are equipped with Expanded graphite layer.

3. a kind of stepped tooth contact flange as claimed in claim 1, it is characterized in that: there is radial deflection between the stepped tooth on the upper and lower surface of described wave tooth spacer, side-play amount is half tooth distance.

4. a kind of stepped tooth contact flange as claimed in claim 1, is characterized in that: described upper flange and lower flange include the flange plate, cone neck and the cylinder that are connected successively, and described flange plate, cone neck and cylinder are as a whole.

5. a kind of stepped tooth contact flange as claimed in claim 1, it is characterized in that: the flange plate of described upper flange and lower flange is equipped with bolt hole, upper flange and lower flange are bolted fixing.