CN205639961U - Flexible graphite metal ripples tooth composite pads piece - Google Patents

Abstract

The utility model relates to the field of sealing structures of pipe flanges, in particular to a flexible graphite metal corrugated composite gasket. It includes a metal corrugated tooth skeleton, the upper and lower surfaces of the metal corrugated tooth skeleton are provided with corrugated teeth, and the upper and lower surfaces of the metal corrugated tooth skeleton are laid with flexible graphite layers; The thickness of the metal positioning ring is greater than or equal to the thickness of the metal wave-tooth skeleton, and less than or equal to the thickness of the metal wave-tooth skeleton plus the lower two flexible graphite layers; when in use, the metal wave-tooth skeleton is located between the upper and lower flanges , the connecting bolts connecting the upper and lower flanges also pass through the corresponding metal positioning rings. The gasket can effectively suppress the excessive deflection angle of the flange, and make the gasket evenly stressed, prevent the gasket from being partially crushed, and maintain good sealing performance for a long time, effectively preventing the joint between the flange and the gasket of the leak.

Description

A flexible graphite metal corrugated composite gasket

technical field

The utility model relates to the field of sealing structures of pipe flanges, in particular to a flexible graphite metal corrugated composite gasket.

Background technique

Since the beginning of the 21st century, the contradictions between economic development and energy supply and environmental protection have become increasingly prominent, and safety, efficiency, economy, and environmental protection have become the themes of industrial development. This theme is mainly reflected in the safe operation of chemical equipment and the tightness of the connection system in the petrochemical industry. Flange connection is widely used in the connection of pressure pipes and pressure vessels in the petrochemical industry due to its advantages of easy disassembly and assembly. Long-term high-temperature and high-pressure working conditions make the flange joints prone to leakage. As far as gasket sealing is concerned, the leakage of sealing fluid often occurs at the junction of flange gaskets. Commonly used raised face flanges have a convex platform on the end face of the flange. Under working conditions, there will be bending moments on the flange, uneven stress on the gasket, and deflection of the flange, which are prone to leakage. In addition, under high temperature and high pressure operating conditions, the end face of the flange, gaskets, and bolts will be subject to great stress. In this case, the flange gaskets are easily crushed due to excessive stress, which eventually leads to leakage failure .

Utility model content

In view of the above technical problems, the purpose of this utility model is to provide a flexible graphite metal wave-tooth composite gasket, which can effectively suppress the excessive deflection angle of the flange, and make the gasket evenly stressed, preventing the gasket from The gasket is partially crushed and maintains good sealing performance for a long time, effectively preventing leakage at the joint between the flange and the gasket.

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

A flexible graphite metal wave-tooth composite gasket, which includes a metal wave-tooth skeleton, the upper and lower surfaces of the metal wave-tooth skeleton are provided with wave teeth, and the upper and lower surfaces are all laid with flexible graphite layers; it is characterized in that: the metal wave-tooth A circle of metal positioning ring is arranged around the tooth frame, the thickness of the metal positioning ring is greater than or equal to the thickness of the metal corrugated tooth frame, and less than or equal to the thickness of the metal corrugated tooth frame plus the next two layers of flexible graphite layers; when in use, the metal corrugated tooth frame The tooth frame is located between the upper and lower flanges, and the connecting bolts connecting the upper and lower flanges also pass through the corresponding metal positioning rings.

The range of the thickness T of the metal positioning ring is: 0≤θ≤1°; the thickness of the metal corrugated frame is t, the inner diameter of the metal corrugated frame is D ₁ , the outer diameter of the metal corrugated frame plus the metal positioning ring is D ₂ , the end faces of the upper and lower flanges The deflection angle under the action of the pretightening force of the connecting bolt is θ.

The beneficial effects of the utility model are: the utility model can be applied to high-temperature or high-pressure working conditions, when the upper and lower flanges are pressed against the gasket of the utility model, the flange sealing end faces are first positioned with the thickened metal The better rigidity of the metal positioning ring can prevent further deflection of the flange, and this design can effectively prevent leakage of the flange due to excessive deflection angle. The structure adopts a thickened flexible graphite layer and a metal corrugated tooth structure, which has better resilience than a simple flexible graphite gasket, and can be better used in pressure fluctuations or other occasions with fluctuating loads. Compared with the traditional flexible graphite wave-tooth composite gasket, the flexible graphite metal composite gasket with thickened metal positioning ring in the utility model has more uniform stress distribution along the radial direction of the gasket during use, better sealing performance, and effective Prevent the gasket from being crushed due to excessive local stress. At the same time, the thickened metal positioning ring offsets part of the excessive bolt pre-tightening force, avoiding leakage failure caused by gasket crushing due to excessive bolt pre-tightening force.

Description of drawings

Fig. 1 is the overall sectional structure schematic diagram (front view) of the present utility model.

Fig. 2 is a sectional structural schematic diagram (front view) of the utility model applied to a flange.

In the figure: 1—upper flange, 2—connecting bolts, 3—flexible graphite layer, 6—metal corrugated skeleton, 7—metal positioning ring, 8—lower flange.

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 flexible graphite metal corrugated tooth composite gasket, which includes a metal corrugated tooth skeleton 6, the upper and lower surfaces of the metal corrugated tooth skeleton 6 are provided with corrugated teeth (that is, the cross section of the metal corrugated tooth skeleton 6 is wavy), and the upper and lower surfaces Both are laid with flexible graphite layers 3; it is characterized in that: a circle of metal positioning ring 7 is arranged around the metal wave-tooth skeleton 6, and the thickness of the metal positioning ring 7 is greater than or equal to the thickness of the metal wave-tooth skeleton 6, and less than or equal to the metal Corrugated tooth frame 6 plus the thickness of the lower two layers of flexible graphite layers 3; when in use, the metal corrugated tooth frame 6 is located between the upper and lower flanges (ie, the upper flange 1 and the lower flange 8), connected The connecting bolts 2 of the upper and lower flanges also pass through the corresponding metal positioning ring 7 (that is, the number, position and inner diameter of the metal positioning ring 7 match the connecting bolt 2, the number is the same, the position is corresponding, and the inner diameter The outer diameter is the same as that of the connecting bolt 2; it is used for positioning the metal corrugated skeleton 6).

The range of the thickness T of the metal positioning ring 7 is: 0≤θ≤1°; the thickness of the metal corrugated frame 6 is t, the inner diameter of the metal corrugated frame 6 is D ₁ , the outer diameter of the metal corrugated frame 6 plus the metal positioning ring 7 is D ₂ , the upper and lower The deflection angle of the end face of the flange under the action of the pretightening force of the connecting bolt 2 is θ.

The sudden change in the shape of the connection between the metal corrugated skeleton 6 and the metal positioning ring 7 is treated in an arc-shaped transition to avoid stress concentration and cause fracture.

A flexible graphite metal wave-tooth composite gasket is mainly used in flanges with flat sealing surfaces and bolted connections.

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 flexible graphite metal corrugated tooth composite pad, it comprises metal corrugated tooth skeleton (6), the upper and lower surfaces of metal corrugated tooth skeleton (6) are all provided with corrugated teeth, and its upper and lower surfaces are all laid with flexible graphite layer ( 3); it is characterized in that: a circle of metal positioning ring (7) is arranged around the metal wave-tooth skeleton (6), the thickness of the metal positioning ring (7) is greater than or equal to the thickness of the metal wave-tooth skeleton (6), Less than or equal to the thickness of the metal corrugated skeleton (6) plus the lower two layers of flexible graphite layers (3); when in use, the metal corrugated skeleton (6) is located between the upper and lower flanges, connecting the upper and lower flanges The connecting bolts (2) of the disk also pass through the corresponding metal positioning rings (7). 2. A flexible graphite metal corrugated composite gasket according to claim 1, characterized in that: the range of thickness T of the metal positioning ring (7) is: 0≤θ≤1°; where the thickness of the metal wave-tooth skeleton (6) is t, the inner diameter of the metal wave-tooth skeleton (6) is D ₁ , and the outer diameter of the metal wave-tooth skeleton (6) plus the metal positioning ring (7) The diameter is D ₂ , and the deflection angle of the end faces of the upper and lower flanges under the action of the pretightening force of the connecting bolt (2) is θ.