CN103206539A

CN103206539A - Metal gasket

Info

Publication number: CN103206539A
Application number: CN2013101373300A
Authority: CN
Inventors: 袁奕琳; 程向瑶; 严秋萍
Original assignee: NINGBO IDT SINYUAN SEALING TECHNOLOGY CO LTD
Current assignee: NINGBO IDT SINYUAN SEALING TECHNOLOGY CO LTD
Priority date: 2013-04-19
Filing date: 2013-04-19
Publication date: 2013-07-17

Abstract

The invention discloses a metal gasket, and belongs to the technical field of sealing members. The metal gasket comprises a metal ring; the cross section of the metal ring is in the shape of a rectangle with four fillets; and each fillet of the metal ring is provided with one O-shaped ring. When used, the metal ring is arranged between two flanges; one trapezoidal groove is reserved at the corresponding position of each flange; and the upper end and the lower end of the metal ring extend into the trapezoidal grooves. The O-shaped rings at the fillets of the metal ring contact with two inner lateral sides of the trapezoidal grooves initially; and as compression force between the flanges increases, the O-shaped rings are elastically deformed, and the O-shaped rings can cling to an uneven contact surface to form an excellent sealing. Besides, the fillets of the metal ring contact with the inner lateral sides of the trapezoidal grooves to form another sealing. If parts of the outer lateral sides of the fillets do not cling to the inner lateral sides of the trapezoidal grooves, the O-shaped rings can provide compensation, thus requirements on manufacture accuracy and surface roughness of the metal gasket and the trapezoidal grooves of the flanges are not high.

Description

The metal ring pad

Technical field

The present invention relates to seal the pad of usefulness, relate in particular to a kind of for the metal ring pad that seals between the flanged surface.

Background technique

The metal ring pad is that to become sectional shape with metal material processing be octagon or oval-shaped entity metallic shim, has the radial seal energized by internal pressure effect.The metal ring pad is that the back cushion sheet contacts with the interior outer side surface (mainly being outer side surface) of flange dovetail groove, and forms sealing by compressing.

The metal ring pad derives from the U.S. the earliest, use field of boilers first in the twenties in 20th century, be used for the sealing of manhole cover, autoclave and other containers, in Petroleum Production and petroleum refining industry, especially come into one's own later on, along with the temperature and pressure increase of steam power plant, the purposes of metal ring pad just more and more widely.The nominal pressure that the metal ring pad is suitable for is 2.0 ~ 42.0MPa..

The cross section is that oval-shaped metal ring pad is that line contacts with flange slot, and sealing is better, but the requirement on machining accuracy height, thereby increased manufacture cost.Octagonal metal ring pad requirement on machining accuracy is higher, requires the face contact.This pad is also very high to the required precision of flange slot with matching, and not so the sidewall of annular gasket just can not form with the madial wall of flange slot and be close to the influence sealing.

Summary of the invention

The present invention is directed to deficiency of the prior art, the metal ring pad is provided, lower to the accuracy of manufacturing requirement, reduce production costs greatly.

For solving the problems of the technologies described above, the present invention is solved by following technical proposals: the metal ring pad, comprise metal ring, the cross section of described metal ring is to be the rectangle of rounding or chamfering around one, and each rounding of described metal ring or chamfering place are provided with O type circle.During use, metal ring is arranged between two flanges, is provided with dovetail groove on the relevant position of each flange, and the two ends up and down of metal ring are stretched in the described dovetail groove.The O type circle of the rounding of metal ring or chamfering contacts with two inner side surfaces of dovetail groove earlier, lifting along with impacting force between the flange plate, O type circle generation elastic strain, this elastic strain makes O type circle to be close to the out-of-flatness of Compensating flange face upper trapezoid groove inwall with rough surface of contact formation.Rounding or the chamfering place of metal ring also contact with the inner side surface of dovetail groove simultaneously, form sealing again.If there is the outer side surface of part rounding or chamfering not to be close to the inner side surface formation of dovetail groove, O type circle also can remedy, so the present invention is less demanding to accuracy of manufacturing and the surface roughness of metal ring pad and flange dovetail groove, and low cost of manufacture.Difference according to selecting rubber heatproof degree can realize-Environmental Conditions of 100/+300 degree.

In the technique scheme, preferred, described rounding or chamfering place are provided with draw-in groove, and described O type circle snaps in the described draw-in groove, and has at least the described O type of part circle to be exposed at outside the described draw-in groove.Draw-in groove makes things convenient for location and the installation of O type circle, and O type circle partly is exposed at outside the draw-in groove, and when guaranteeing that the present invention installs, O type circle contacts with dovetail groove at first.

In the technique scheme, preferred, each described rounding or chamfering place are provided with two circle O type circles.

In the technique scheme, preferred, described O type circle is divided into isometric three parts with described rounding or described chamfering.Guaranteeing when mounted can uniform-compression.

In the technique scheme, preferred, the line of described O type circle directly is that 1.5mm is to 3.0mm.

The invention has the beneficial effects as follows: during installation, O type circle closely contacts with the dovetail groove inwall by elastically-deformable mode, the out-of-flatness of Compensating flange dovetail groove.Even the madial wall of dovetail groove has certain foozle or roughness, elastic strain also can remedy, so the present invention is low to the accuracy of manufacturing requirement of product, and cost of production also just reduces greatly.

Description of drawings

Fig. 1 is the schematic representation of first embodiment of the invention.

Fig. 2 is the schematic representation in a cross section of first embodiment of the invention.

Schematic representation when Fig. 3 applies to the flanged surface sealing for the schematic representation of first embodiment of the invention.

Fig. 4 is the schematic representation of second embodiment of the invention.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail: embodiment 1, referring to Fig. 1 to Fig. 2, the metal ring pad, comprise metal ring 1, the cross section of metal ring 1 is to be the rectangle of rounding 11 around one, each rounding 11 place of metal ring 1 form two circle draw-in grooves 12, are provided with an O type circle in each draw-in groove 12, and have at least part of O type circle 2 to be exposed at outside the draw-in groove 12.

One of them O type circle 2 is positioned at 1/3 place of rounding arc length, and another O type circle 2 is positioned at 2/3 place of rounding arc length, and two O type circles are divided into isometric three parts with described rounding.

The line of O type circle 2 directly is 1.5 mm.

Referring to Fig. 3, during use, the present invention is installed between the dovetail groove 31 of two flange plate 3, the O type circle 2 at rounding 11 places of metal ring 1 contacts with two inner side surfaces of dovetail groove 31 earlier, lifting along with impacting force between the flange plate 3, elastic strain takes place in O type circle 2, and this elastic strain makes O type circle to be close to rough surface of contact formation, forms excellent sealing.The rounding place of metal ring also contacts with the inner side surface of dovetail groove simultaneously, forms sealing again.If there is the outer side surface of part rounding not to be close to the inner side surface formation of dovetail groove, O type circle also can remedy, so the present invention is less demanding to accuracy of manufacturing and the surface roughness of metal ring pad and flange dovetail groove, and low cost of manufacture.

Embodiment 2, referring to Fig. 4, the metal ring pad, comprise metal ring 1, the cross section of metal ring 1 is to be the rectangle of chamfering 11 ' around one, each chamfering 11 ' of metal ring 1 locates to form two circle draw-in grooves 12 ', is provided with an O type circle 2 in each draw-in groove 12 ', and has at least part of O type circle 2 to be exposed at outside the draw-in groove 12.Two O type circles are divided into isometric three parts with described chamfering 11 '.All the other repeat no more here with embodiment 1.

Claims

1. metal ring pad, comprise metal ring (1), the cross section of described metal ring (1) is to be the rectangle of rounding (11) or chamfering (11 ') around one, and it is characterized in that: each rounding (11) or the chamfering (11 ') of described metal ring (1) locate to be provided with O type circle (2).

2. metal ring pad according to claim 1, it is characterized in that: described rounding (11) or chamfering (11 ') locate to be provided with draw-in groove (12,12 '), described O type circle (2) snaps in the described draw-in groove (12,12 '), and has at least the described O type of part circle (2) to be exposed at outside the described draw-in groove (12,12 ').

3. metal ring pad according to claim 2 is characterized in that: each described rounding (11) or chamfering (11 ') locate to be provided with two circle O type circles (2).

4. metal ring pad according to claim 3, it is characterized in that: described O type circle (2) is divided into isometric three parts with described rounding (11) or chamfering (11 ').

5. want 3 or 4 described metal ring pads according to right, it is characterized in that: the line of described O type circle (2) directly is that 1.5mm is to 3.0mm.