JP2587510Y2 - Gasket for pipe flange - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket for a pipe flange used in a joint portion of a pipe, and more particularly to a gasket for a pipe flange of a joint sheet.

[0002]

2. Description of the Related Art As shown in FIG. 7, at the joint of a pipe for piping, as shown in FIG.
The flanges 1a, 1a are fastened by bolts 3 with the gasket 2 interposed between the flanges 1a, 1a. However, the stress applied to the gasket is reduced as the date and time elapse, and the bolt 3 is loosened. In general, in plant equipment and the like, it is necessary to periodically retighten bolts 3 or
Since the gasket 2 is replaced at regular inspections every year, loose bolts are unlikely to cause a problem.

[0003] However, it is a fact that gaskets are not replaced or regularly retightened in piping of building equipment and the like. For this reason, at the time of piping equipment,
It should be tightened with sufficient surface pressure. However, if the bolts are tightened too much at the beginning of construction, the bolts may break beyond the allowable stress. As a method of applying a sufficient surface pressure to the gasket without breaking the bolt, it is conceivable to reduce the area of the gasket, that is, the outer diameter of the gasket. However, if the outer diameter of the gasket is reduced to such an extent that a sufficient surface pressure is applied, it becomes impossible to form a bolt hole in the gasket. In this case, as shown in FIG. 8, since the mounting position of the small gasket 4 is not fixed by the bolt 3, it is difficult to position the gasket at the time of mounting, and the mounted position may be shifted.

The present invention has been made in view of such a technical background. The purpose of the present invention is to provide a bolt with no load at the time of construction and to make it unnecessary to retighten the bolt. It is an object of the present invention to provide a gasket that can apply an appropriate surface pressure and that can easily position the gasket during construction.

[0005]

The gasket for a pipe flange according to the present invention has two flanges (18) of two pipes (18).
In the gasket 10 for a pipe flange attached between the flanges 18a, 18a at a pipe joint portion connecting the bolts a, 18a with bolts, a first portion having a fitting portion 13 on the outer periphery is provided.
A ring 11 and a second ring 12 fitted to the fitting portion 13 of the first ring 11 and positioned by the bolt 19, and the thickness of the second ring 12 is And the first ring
11 are provided on the outer peripheral surface of the first ring 11.
Ring formed on the second ring 12
The cutting section 15 is provided in one place .

[0006]

[0007]

The gasket for a pipe flange of the present invention is fixed to a predetermined position of the flange 18a of the pipe 18 by the second ring 12 at the pipe joint portion of the two pipes 18, 18. At the time of construction, the gasket should be tightened with the second ring 12
Is carried out to the extent that the bolt 19 is not broken. Second
Since the ring 12 is thinner than the first ring 11,
By tightening the second ring 12, a sufficient surface pressure is applied to the first ring 11, and additional tightening becomes unnecessary.

Further, the second ring 12 is connected to the first ring 11
Since the ring can be slightly opened at the cut portion 15 of the second ring 12 when fitting into, the fitting operation becomes easy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a gasket 10 according to an embodiment of the present invention. The gasket 10 is shown in FIG.
The outer periphery of the first ring 11 shown in, but fitted with a second ring 1 2 shown in FIG.

The first ring 11 is made of, for example, a material suitable for sealing such as a joint sheet, and has a groove serving as a fitting portion 13 provided on the outer periphery thereof by lathe processing. here,
A joint sheet is generally composed of 65% or more by weight of asbestos fiber and 10% or more of rubber and a vulcanizing agent and other compounds.
Or, a material obtained by mixing a filler and heating and compressing it into a dense and uniform cardboard shape (JIS R3453). Recently, there are also sheets using inorganic fibers other than asbestos fibers, including sheets using the inorganic fibers. It is. First ring 11
Is equivalent to the thickness of a conventional gasket for a pipe flange, and is a thickness sufficient for sealing a pipe joint portion, specifically, about 1.5 to 3 mm. The depth and width of the groove of the fitting portion are not particularly limited, but the depth is 2 to 8 mm from the viewpoint of workability.
And the width is preferably about 0.5 to 1 mm.

The second ring 12 has an inner diameter of the first ring 11.
And the outer diameter is large enough to form a bolt hole for fixing to the flange.
The thickness of the second ring 12 is substantially equal to the width of the groove serving as the fitting portion 13 of the first ring 11. Thereby, the second ring 12 can be fitted into the fitting portion 13 of the first ring 11.
The second ring 12 is provided with bolt holes 14 for fixing to the flange. Also, the second ring 1
The second ring 12 is cut by a cutting portion 15. When the second ring 12 is inserted into the fitting portion 13 of the first ring 11 while slightly opening the cutting portion 15, the first ring 11 of the second ring 12 is cut. The mounting work to the device becomes easy.

The constituent material of the second ring is not particularly limited.
The same material as that of the first ring may be used, or a material that is less expensive and harder than the material of the first ring may be selected. The state where the gasket 10 having the above configuration is fixed between the flanges of the tube is as shown in FIG. Tube 18,
The two flanges 18a, 18a of the
The bolt 19 is inserted into the bolt hole 14 and fastened and fixed. At this time, the thickness of the second ring 12 is
Since it is thinner than 1, a sufficient surface pressure is applied to the first ring 11 even with a tightening force that is not enough to break the bolt 19. Therefore, according to the gasket 10 of the present invention, a sufficient surface pressure is obtained at the seal portion, so that retightening is not required, and since the gasket 10 is fixed to the flange with the bolt 19, the position of the gasket 10 can be easily shifted. Or not.

In the above embodiment, the second ring 12
The thickness of the second ring 12 is equal to the groove serving as the fitting portion 13 of the first ring 11, but the present invention is not limited to this. If it has an inner circumference, the ring portion may be slightly thicker. In short, by tightening the second ring 12, the first ring
The second ring 12 only needs to be thinner than the first ring 11 so that a sufficient surface pressure is obtained at the ring 11 portion.

The cutting portion 15 of the second ring 12 is
This is for facilitating the work of inserting into the ring 11 and pushing in the second ring 12 by applying a certain amount of force.
The cutting portion 15 may not be provided as long as the cutting portion 15 can be fitted to the ring 11. Further, the second ring 12 has a bolt hole 1
4, 14,... Are established, but are not essential in the present invention, as long as the second ring 12 can be fixed to a predetermined position of the flange by bolts. For example, as shown in FIG.
The outer diameter of the ring may be set at the bolting position, and the ring may be fixed by three or more bolts.

In the above embodiment, the fitting portion of the first ring is a groove, but may be a stepped portion. The gasket 20 shown in FIG.
3 is stepped , and is attached to the second ring 22 so as to abut on the stepped portion 23.

[0016]

The gasket for a pipe flange of the present invention is tightened with bolts based on the second ring, which is thinner than the first ring.
Sufficient surface pressure can be applied to the ring. Therefore, it is suitable as a gasket used for a joint portion of a pipe body in which retightening of a building's piping equipment or the like is not generally performed. In addition, since the gasket of the present invention is mounted at a predetermined position on the flange by the second ring and the bolt, the ease of the gasket mounting operation is not different from the conventional one, and the gasket does not shift even after the date and time has passed.

Further, since the constituent material of the second ring has no relation to the sealing property, the material can be appropriately selected and the cost can be reduced. Further, in the pipe flange gasket in which the cut portion is provided in the second ring, the work of attaching the second ring to the first ring becomes easy.

[Brief description of the drawings]

FIG. 1 is a plan view of a gasket for a pipe flange according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a first ring of the pipe flange gasket according to the present embodiment.

FIG. 3 is a perspective view showing a second ring of the pipe flange gasket according to the present embodiment.

FIG. 4 is a cross-sectional view showing a state in which the pipe flange gasket according to the present embodiment is mounted between the flanges of the pipe body.

FIG. 5 is a sectional view showing a state in which a gasket for a pipe flange according to another embodiment of the present invention is mounted between flanges of a pipe body.

FIG. 6 is a perspective view (a) and a cross-sectional view (b) of a gasket for a pipe flange according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a state in which a conventional gasket is mounted between flanges of a tube.

FIG. 8 is a cross-sectional view showing a state in which a conventional gasket is mounted between flanges of a tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Gasket for pipe flanges 11 1st ring 12 2nd ring 13 Fitting part 15 Cutting part 18 Pipe 18a Flange 20 Gasket for pipe flange 21 First ring 22 Second ring 23 Fitting part

Claims (1)

(57) [Scope of request for utility model registration] 1. A flange (18a), (18a) at a pipe joint portion connecting two flanges (18a), (18a) of two pipes (18), (18) with bolts (19).
A gasket (10) for a pipe flange mounted between the first ring (11) having a fitting portion (13) on the outer periphery;
A second ring (12) fitted to the fitting portion (13) of the first ring (11) and positioned by the bolt (19); and a thickness of the second ring (12). Is thinner than the thickness of the first ring (11) , and
The fitting part (13) of the first ring (11) is
(11) It is composed of a circular groove provided on the outer peripheral surface, and the second phosphorus
(12) is provided with a cutting portion (15) for opening the ring.
A gasket for a pipe flange, which is provided at a location .