JP3304007B2 - Gasket with cover - 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 with a cover interposed in a joint portion of a fluid pipe.

[0002]

2. Description of the Related Art A gasket attached to a fluid pipe used for transferring a fluid, for example, a leakproof pipe at a joint portion of a pipe body such as a stainless steel pipe, contacts a fluid, for example, tap water. It is required that it does not elute chloride ions (Ministry of Construction's Common Specifications for Machinery and Equipment Construction (1993 version)). Gaskets satisfying this requirement have rubber-based or fluoroplastic-based parts in contact with water. It is a gasket made of a material. Of these, some rubber-based gaskets are generally inferior in durability, such as ozone degradation, and therefore generally use fluororesin-based gaskets.

[0003] As a fluorine resin gasket, FIG.
There is something like that shown in The gasket 1 has a ring-shaped gasket main body 2 made of a rubber-based material and both surfaces covered with a fluororesin cover 3. As the fluororesin cover 3, a fluororesin cylindrical body that is sliced using two cutters simultaneously so as to leave only the inner peripheral portion is used. In the cover 3 thus obtained, the ring-shaped cover 3a on one surface and the ring-shaped cover 3b on the other surface are connected to each other via the connection portion of the inner peripheral portion 4, but the outer peripheral portion 5 Is in a free state.

[0004]

However, when such a gasket with a cover made of a fluororesin is mounted between pipe joints, there are the following problems. As shown in FIG. 14, when the gap between the flanges 8a of the pair of long pipes 7a is large in the piping work of the pipe at the construction site, a short pipe 7b almost matching this gap is inserted, and the long pipe is inserted. Tube 7
The gasket 9 is inserted into the gap between the flange 8a and the flange 8a of the short tube 7b and the flanges 8a and 8b are fastened with bolts. However, the long tube 7a and the short tube 7
The gap between the flanges 8a and 8b of b is set in advance to the thickness of the gasket 9 in relation to the sealing performance. Therefore, when the gasket 1 with the cover made of fluororesin is inserted into the gap from the diametrically outer side of the flanges 8a and 8b, the outer peripheral portion 5 in the free state on the insertion start end side of the cover 3 of the gasket 1 is turned up, Insertion of the gasket 1 becomes difficult, and workability becomes very poor. In addition, if the gasket 1 is mounted with the cover 3 turned up, water leaks, and the gasket no longer functions.

On the other hand, two fluororesin covers 3 on both sides
If the outer peripheral portions 5 of a and 3b are joined, the above-mentioned problem does not occur. However, in general, fluororesins are chemically inert and have extremely low adhesiveness. For this reason, when bonding fluororesins to each other, it is necessary to increase the adhesiveness by performing an appropriate chemical treatment on the bonding surface, which is expensive.
In gaskets used for piping for physical and chemical plants, the surface of the adhesive surface is treated and then the outer peripheral part is bonded to prevent the fluororesin cover from turning over. Not practical in terms of cost.

As a gasket for preventing the drawbacks of the cover made of fluororesin, there is a gasket in which the gasket body itself is made of fluororesin, and the gasket in which the body is made of fluororesin, the body is made of rubber material. Since it does not have elasticity as compared with a gasket, there is a disadvantage that the sealing performance is poor. In addition, in the conventional gasket,
Generally, since the dimensions were not displayed, a gasket having an incorrect dimension was sometimes attached. The present invention
The present invention has been made in view of the above technical background, and an object of the present invention is to provide a gasket with a cover that is inexpensive and that can prevent the cover from being turned up to improve workability.

[0007]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, the invention of claim 1 includes a ring-shaped gasket main body and a ring-shaped fluororesin cover that covers the gasket main body.
For example, the fluorine resin cover, of the gasket body
Cover one side cover that covers one side and the other side cover that covers the other side.
It has a shape that is connected and integrated on the inner peripheral side of thesket body.
Ri, the outer peripheral portion of the one side cover and the other side cover, gas
The gasket is projected outside the
It is characterized by being mutually joined by sewing outside the main body .

According to a second aspect of the present invention, a ring-shaped gasket is provided.
A body and a ring-shaped fluororesin covering the gasket body
And a cover made of fluororesin.
One side cover that covers one side of the sket body, and the other side that covers the other side
The side cover and the inner peripheral side of the gasket body are connected and integrated.
The shape of this one side cover and the other side cover
When the outer periphery protrudes outside the gasket body
Joined together by sewing on the outside of the gasket body
And one or more handle portions on the outer periphery of the gasket body.
Will protrude more outward than the one side cover and the other side cover.
It is characterized by being provided as follows .

According to a third aspect of the present invention, a gasket is connected to a pipe joint.
When mounted on the part, the handle protrudes from the joint
It is characterized in that it is set to a length. The invention according to claim 4 is characterized in that the type of gasket,
Or date of manufacture, material or size
It is characterized by. According to a fifth aspect of the present invention, a ring-shaped gas
A gasket main body, and a ring-shaped fan covering the gasket main body.
And a fluorine resin cover.
Covers one side of the gasket body by cutting
One side cover and the other side cover and gasket body covering the other side
The inner peripheral side of one side cover and the other side cover are connected on the inner peripheral side of
It is formed in a shape of a cross section U between portions, the one side
The outer periphery of the cover and the other side cover is
The gasket main body.
It is characterized by being mutually joined by sewing on the side
I have.

The invention according to claim 6 is a ring-shaped gasket.
A body and a ring-shaped fluororesin covering the gasket body
And a cover made of fluororesin.
The folded part of the thin sheet material which is folded in two
To form a ring by thermal processing.
And one side cover that covers one side of the gasket body.
Connect the other side cover that covers the side on the inner peripheral side of the gasket body
It is an integral shape, the one side cover and other
The outer periphery of the side cover projects outward from the gasket body
Sewn on the outside of the gasket body
It is characterized by being more joined.

The invention according to claim 7 is a ring-shaped gasket.
A body and a ring-shaped fluororesin covering the gasket body
And a gasket main body having a large thickness.
The inner peripheral ring and a thinner part located on the outer peripheral side of the inner peripheral ring
Outer ring, and the fluororesin cover is
One side cover that covers one side of the inner peripheral ring and the other side that covers the other side
The side cover and the inner peripheral side of the inner ring are connected and integrated.
And are, outer circumference of the one side cover and the other side cover
Part is projected outside the inner peripheral ring and
Sew each other around the outer ring around the outer ring
It is characterized by being more joined.

The invention according to claim 8 is characterized in that the inner peripheral ring and the outer periphery
The ring and the ring are configured separately, and
A fitting groove is formed, and the fitting groove
The inner peripheral edge is fitted and integrated.
ing. The invention according to claim 9 is that the outer peripheral ring includes a pipe.
Bolt holes for fixing to joints are formed
It is characterized by.

[0013]

According to the present invention, one side cover of a fluororesin cover is provided.
Since the outer peripheries of the bar and the other side cover are joined by sewing , even if the cover is made of a chemically inert fluororesin , it can be joined irrespective of the chemical properties of the cover material. In addition, since sewing does not require a chemical surface treatment, the work is easy and inexpensive. And
In the gasket of the present invention, the outer peripheries of the one-side cover and the other-side cover are joined to each other . And good sealing performance.

Also, by providing a handle on the outer periphery of the gasket main body and projecting from the outer periphery of the cover, the gasket can be inserted between the joints by holding the handle by hand when inserting the pipe into the joint. As a result, the gasket fitting indication can be displayed, and the type, size, and the like of the gasket can be displayed on the handle, so that the reliability can be improved. Furthermore, by cutting the cross-sectional shape of the cover into a U-shape, the inner peripheral surface of the joint of the pipe and the inner peripheral surface of the cover can be flush with each other. To prevent liquid from accumulating in the

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a gasket 10 with a fluororesin cover according to a first embodiment of the present invention. The gasket 10 is formed by covering both surfaces of a ring-shaped gasket main body 12 shown in FIG. 2 with a fluororesin cover 13 shown in FIG. 3, and an outer peripheral portion 15 of the cover 13 is sewn by a sewing machine. In FIG. 1, reference numeral 16 denotes a joint formed by a seam formed by a sewing machine.

Gasket main body 12 used in this embodiment
Is obtained by solidifying a rubber-based polymer containing fibers or the like into a ring shape having a thickness of about 2 mm. The cover 13 made of a fluororesin is formed by joining a ring-shaped cover 13a on one side and a ring-shaped cover 13b on the other side by joining the inner peripheral portion 14 to be connected and integrated. Such a cover 13
Is usually obtained by simultaneously slicing a fluororesin cylindrical body using two cutters while leaving only a part of the inner peripheral portion. Covers 13a, 13 on both sides
The thickness of each b is about 0.4 mm. This cover 1
3. Open the outer peripheral portion 15 of the ring-shaped gasket body 1
2 can be attached.

For sewing with a sewing machine, a household sewing machine is sufficient. The yarn to be used may be appropriately selected depending on the thickness of the cover 13. The type is not particularly limited, and various types such as cotton yarn and synthetic fiber can be used. As described above, the gasket with the cover of the present embodiment is shown in FIGS.
As is clear from FIG.
The outer peripheral portions of the bar 13a and the other side cover 13b are
The gasket is projected outside the
Are joined to each other outside by sewing.
ing.

In this way, the one-side cover 13a and the other-side cover 13b, which have been in the free state, are joined at the outer peripheral portion, that is, at the start end when the gasket is inserted.
When the cover 13 is inserted between the flanges of the tube, the cover 13 does not turn over. Moreover, the sewing of the sewing machine does not lead to such an increase in cost in terms of material and labor. In the first embodiment, the sewing by the sewing machine is used.
However, not only when using a machine, but also by hand sewing
It may be. By these sewings , the joining can be performed irrespective of the characteristic of the fluorine resin, which is chemically inert, and there is an effect that the cover can be prevented from being turned up when attached to the tube.

FIGS. 4 and 5 show a gasket main body 12 which is a main part of a second embodiment of the present invention.
One or a plurality of handle portions 17 are protrudingly provided on the outer periphery of. When the cover 13 is attached, the handle portion 17 holds the cover 1
3 can be mounted very easily by holding the handle portion 17 by hand and inserting it into the joint portion of the pipe at the time of mounting on the pipe body, thereby improving workability.
FIG. 4 shows a gasket main body 12 having a circular ring shape and a handle portion 17 protruding therefrom. FIG. 5 shows a gasket main body 12 having a square (window frame) ring shape and a handle portion 17 protruding from the outer periphery of the corner portion. It was done.

The handle 17 may be integrated with the gasket main body 12 or may be attached to the gasket main body 12 by an appropriate method. For example, using a thinner than the thickness of the gasket body 12 as the handle part 17,
If attached to the gasket body 12, the base of the handle 17 can be joined together with the outer periphery of the cover 13 (see FIG. 6). Further, since the handle portion 17 protrudes from the joint portion of the pipe, the handle portion 17 has a function of indicating that the gasket has been installed, and the type, construction or manufacturing date, material, size, etc. of the gasket 10 are displayed on the handle portion 17. By doing so, the reliability of the product can be enhanced, mounting errors can be eliminated, and it can be used as an index of replacement time. In addition, the dimensional display of the gasket 10 is not limited to the handle portion 17 but may be the gasket body 12.
May be displayed. The display on the gasket body 12 can be read even after the cover 13 made of the fluororesin is attached.

FIGS. 7 and 8 show a gasket main body 12 which is a main part of a third embodiment of the present invention. The gasket main body 12 has a large thickness (about 1.5 to 3 mm and has a sufficient sealing function). (Thickness) Inner circumference ring 12A and thinner thickness (0.
(About 5 to 1 mm) Outer ring 12B, 0.5 to 1 mm in width and 2 to 8 m in depth on the outer surface of inner ring 12A.
An inner peripheral edge of the outer ring 12B is fitted into and integrated with the fitting groove 18. The outer ring 12B has an inner diameter that is substantially the same as the outer diameter of the bottom of the fitting groove 18 of the inner ring 12A, and has a bolt hole 20 for fixing the outer diameter to a joint (flange) 19A of the pipe 19. The incision 21 is provided by cutting one portion in the radial direction, and the outer ring 12B is inserted into the fitting groove 18 of the inner ring 12A with the incision 21 slightly opened.
Are fitted at the inner peripheral end.

In the third embodiment, as shown by a two-dot chain line in FIG.
Are integrally joined by sewing 16 in the same manner as in the first embodiment so as to sandwich the inner and outer rings 12.
A and 12B are also integrated via the cover 13. did
Therefore, the gasket with cover 10 of the present embodiment is
Outer peripheral portion of one side cover and other side cover of plastic resin cover 13
Is projected outward from the inner peripheral ring 12A.
The outer ring 12B is sandwiched outside the inner ring 12A.
They are joined together by sewing.

Further, in the third embodiment, the outer diameter of the outer ring 12B is made larger than the outer diameter of the joint portion 19 of the pipe to clarify the function of indicating the completed state, and to improve the gasket 1
0 type, construction or manufacturing date, material, size, etc. can be displayed. According to the third embodiment, since the gasket is tightened by the bolt 22 and the nut 23 based on the thin outer ring 12B, a sufficient surface pressure is applied to the inner ring 12A without breaking the bolt 22. Therefore, it is suitable as a gasket to be used for a joint portion of a pipe in which retightening of a building's plumbing equipment or the like is not generally performed, and has good workability.
There is no displacement due to aging.

The gasket main body 12 in the first to third embodiments may be a material obtained by hardening a rubber-based polymer, asbestos, an asbestos joint sheet, a non-asbestos joint sheet, a synthetic resin such as vinyl chloride, a filled Teflon, or the like. Can be used. still,
For gaskets whose gasket body is Teflon with filler, carbon fiber is generally used as filler,
Since it becomes conductive, a cover is attached in the sense of imparting insulating properties. FIG. 9 shows a main part, that is, a cover 13 according to a fourth embodiment of the present invention. The cover 13 is formed into a U-shaped cross section by cutting.

That is, the cover 13 made of fluororesin is
One side cover that covers one side of thesket body 12 and the other side
The side cover and the inner side of the gasket body 12
Cross section with the part connecting the inner peripheral part of the other side cover
It is formed in a U-shape, and the outer periphery of one side cover and the other side cover
When the part is projected outside the gasket body 12,
Joined together by sewing on the outside of the gasket body
It has become. In this way, by making the cross section into a U-shape and making the cover inner diameter the same as the inner diameter of the pipe 19, the gap between the opposed end faces of the pipes 19 is filled with the cover 13 without any step, and the inner surface of the pipe 19 and the cover 13 Is flush with the inner peripheral surface, so that liquid can be prevented from accumulating between the cover 13 and the end face of the tube 19.

FIGS. 10 to 12 show a main part, that is, a cover 13 according to a fifth embodiment of the present invention, particularly a cover 13 suitable for a large gasket. As shown in FIG. 12, the cover 13 is made of a material M obtained by folding a strip-shaped thin plate P in the width direction.
Is formed into a ring shape by thermal processing so that the bent portion 13C is on the inner peripheral side, and both end edges 13d, 13d are joined by welding, and the folds generated on the inner peripheral side are not formed by thermal processing. is there. According to the fifth embodiment, it is possible to inexpensively obtain a large cover that cannot be obtained by a method of slicing a bar material with a cutter as in the first embodiment or a method of cutting as in the fourth embodiment. Can be. The attachment to the gasket main body 12 is performed in the same manner as in the first embodiment, and the outer peripheral portions 13a and 13b on both sides can be joined to each other by sewing with a sewing machine.

That is, the gasket with the cover of this embodiment
Also, one side cover 13 of the fluororesin cover 13
a and the outer periphery of the other side cover 13b are
12. The gasket main body is projected outside
Are joined together by sewing on the outside
You. As a material of the cover 13 in each of the above embodiments,
Fluorine resin such as Teflon appropriately selected and can be used. When sewing the cover 13, the workability can be improved by using an inner diameter gauge for a small one and using an outer diameter gauge for a large one.

The present invention is not limited to the above embodiments. For example, the material of the outer peripheral ring 12B of the gasket main body 12 in the third embodiment is appropriately selected from inexpensive materials irrespective of the sealing property. can do. Further, the inner and outer peripheral rings of the third embodiment can be integrated.

[0029]

According to the present invention, as described above, the outer peripheral portions of the two covers covering the gasket main body are joined by sewing , so that the cover does not turn up during the mounting work on the pipe, Mounting work is easy. Moreover, by sewing
Because it is joined, even if the cover is made of a material having a chemically inert property such as a fluororesin, it can be joined irrespective of the property, and further, no chemical treatment or the like is required, The gasket with the cover can be obtained at a low cost while being easily joined.

Further, according to the present invention, since one or a plurality of handle portions are provided on the outer periphery of the gasket main body, the pipe can be easily inserted into the joint portion, and the workability can be improved. Since the handle protrudes from the gasket, this indicates that the gasket has been installed. By displaying the type, material, construction or manufacturing date, size, etc. of the gasket on the handle, reliability can be improved. Further, in the present invention, since the cover is cut in a U-shape in cross section, the inner peripheral surface of the joint portion of the pipe and the inner peripheral surface of the cover can be flushed, and since there is no concave portion, it is possible to prevent stagnation of liquid. The durability of the gasket can be improved.

Further, the present invention is characterized in that the cover is formed into a ring shape by thermal processing a thin plate-shaped material folded in half in the width direction so that a bent portion is on the inner peripheral side. Therefore, a large-sized cover, which is difficult to manufacture by cutting or cutting, can be obtained easily and at low cost.

[Brief description of the drawings]

FIG. 1 is a plan view (a) and a sectional view (b) showing a gasket according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a gasket main body used for the gasket of the first embodiment.

FIG. 3 is a perspective view showing a fluororesin cover used for the gasket of the first embodiment.

FIG. 4 is a perspective view showing an example of a gasket main body which is a main part of a second embodiment of the present invention.

FIG. 5 is a plan view showing another example of the gasket main body in the second embodiment.

FIG. 6 is a sectional view showing an example of a gasket with a cover according to a second embodiment of the present invention.

FIG. 7 is a plan view showing a main part, that is, a gasket main body of a third embodiment of the present invention.

FIG. 8 is a sectional view taken along line AA of FIG. 7;

FIG. 9 is a sectional view showing a main part, that is, a cover, of a fourth embodiment of the present invention.

FIG. 10 is a perspective view showing a main part, that is, a cover, of a fifth embodiment of the present invention.

FIG. 11 is a sectional view of the cover of the fifth embodiment.

FIG. 12 is an explanatory diagram of a manufacturing method of the fifth embodiment cover.

13A and 13B show a conventional example, in which FIG. 13A is a plan view and FIG. 13B is a cross-sectional view.

FIG. 14 is an explanatory diagram of a problem in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Gasket with cover 12 Gasket main body 12A Inner ring 12B Outer ring 13 Cover 13C Bending part 14 Inner part 15 Outer part 16 Sewing part 17 Handle part M Material

Claims (9)

(57) [Claims] A ring-shaped gasket main body and a ring-shaped fluororesin cover for covering the gasket main body are provided.
For example, the fluorine resin cover, one side of the gasket body
Gasket covers one side cover that covers the other side and the other side cover that covers the other side.
The inner peripheral side of the main body is connected and integrated, and the outer peripheral parts of the one side cover and the other side cover are
And projecting outward from the main body.
A gasket with a cover, which is joined to the outside of the body by sewing . 2. A ring-shaped gasket main body, and said gasket
And a ring-shaped fluororesin cover that covers the
For example, the fluorine resin cover, one side of the gasket body
Gasket covers one side cover that covers the other side and the other side cover that covers the other side.
The inner peripheral side of the main body is connected and integrated, and the outer peripheral parts of the one side cover and the other side cover are
And projecting outward from the main body.
The gasket body is joined to the outside of the body by sewing, and one or a plurality of handles are provided on the outer periphery of the gasket body.
So that it protrudes outward from the side cover and the other side cover
A gasket with a cover, which is provided . 3. The method according to claim 1, wherein the gasket is mounted on a joint of the pipe.
The handle is set to a length that protrudes from the joint.
The gasket with a cover according to claim 2, wherein the gasket is provided. 4. The type and construction of a gasket on the handle portion.
Or date of manufacture, material or size is described
The gasket with a cover according to claim 2 or 3, wherein: 5. A ring-shaped gasket main body, and said gasket main body.
And a ring-shaped fluororesin cover that covers the
For example, the fluorine resin cover, said gas by cutting
One side cover that covers one side of the body and the other side that covers the other side
One side cover and other on the inner side of the cover and gasket body
The section of the side cover has a U-shape with the part connecting the inner circumference.
Made which have an outer peripheral portion of the one side cover and the other side cover, gasket
The gasket
It is noted that they are joined together by sewing on the outside of the body.
Cover with gasket and butterflies. 6. A ring-shaped gasket main body, and said gasket
And a ring-shaped fluororesin cover that covers the
For example, the fluorine resin cover was folded into two in the width direction a thin
Heat processing of plate-shaped material so that the bent part is on the inner peripheral side
The gasket is formed in a more ring shape.
One side cover that covers one side of the main unit and the other side cover that covers the other side
Is connected and integrated on the inner peripheral side of the gasket body.
Are, the outer peripheral portion of the one side cover and the other side cover, gasket
And projecting outward from the main body.
Characterized by being joined by sewing on the outside of the body
Cover with a gasket to be. 7. A gasket body having a ring shape,
And a ring-shaped fluororesin cover that covers the
The gasket main body includes a thick inner peripheral ring and the inner peripheral ring.
With a thin peripheral ring located on the outer peripheral side of the ring.
The fluororesin cover covers one side of the inner peripheral ring.
Inner ring for the other side cover and the other side cover that covers the other side
The outer peripheral portions of the one-side cover and the other-side cover are
Outside of the inner ring.
Are joined together by sewing with the outer ring interposed therebetween.
A gasket with a cover. 8. The inner ring and the outer ring are separate bodies.
And a fitting groove is formed on the outer peripheral surface of the inner peripheral ring.
And the inner peripheral edge of the outer ring is fitted into this fitting groove.
The gasket with a cover according to claim 7, wherein the gasket is covered with the cover. 9. The outer peripheral ring is fixed to a joint of a pipe.
It is characterized by forming bolt holes for
A gasket with a cover according to claim 7 .