JP4842023B2 - Serrated gasket - Google Patents

Description

  The present invention relates to a saw-toothed gasket in which a sawtooth-shaped uneven portion is formed in a gasket body, and a sufficient sealing force is exerted by the saw-tooth uneven portion being bitten into a sealing surface.

In order to increase the sealing efficiency, the sawtooth-shaped gasket is formed by forming a large number of annular concave and convex grooves having a sawtooth cross section on the surface of the gasket main body, thereby reducing the effective contact area in the seal portion. Such serrated gaskets are used for valve bonnets, pipe flanges, pressure vessel cover gaskets, and the like. It is particularly suitable for fluid passages such as high-temperature and high-pressure steam.
As such a sawtooth gasket, for example, the sawtooth gasket 10 shown in FIG. 12 is known. The sawtooth gasket 10 is composed of a seal body 2 having serrated irregularities 2a formed on both sides thereof, and a positioning portion 2b for positioning formed integrally with the seal body 2.

The conventional sawtooth gasket 10 having a plurality of such concavo-convex portions 2a has been formed by cutting out from a single large rolled metal plate to a predetermined size. For this reason, there has been a problem that a great deal of labor is required for cutting, and wasteful materials increase, resulting in high costs.
Also, depending on the usage conditions (fluid, temperature, pressure, etc.), it is necessary to use different materials for the gasket seal body, but in the case of expensive materials, it is extremely difficult to use that material for the entire gasket, including the positioning part. There is also a problem that the cost becomes high.

  SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional situation, and an object of the present invention is to provide a saw-toothed gasket that has little wasted material, can be applied to any size, and is low in cost.

To achieve the above object, a sawtooth gasket according to the present invention comprises:
Interposed between the first member and the second member;
The serrated irregularities formed in the gasket body are sawtooth-shaped gaskets that are devised to cut into the seal surface on the first member side and the seal surface on the second member side, respectively, to exert a sealing force,
The gasket body is
The seal part body formed with the serrated irregularities is formed separately from the seal part body on the outer peripheral side of the seal part body, and positioning with respect to the first member and the second member is performed. And a positioning portion.
According to the sawtooth gasket having such a configuration, since the first member and the second member are formed separately in advance and configured by a combination thereof, the labor required for cutting is reduced, and the large-sized gasket is used. Even if it is changed, the material is not wasted.
Further, in the present invention, a belt-like member made of metal and wound in a substantially cross-sectional shape is wound around the outer peripheral surface of the seal body, and the inner peripheral surface of the positioning portion has a cross-sectional shape. Preferably, a letter-shaped annular recess is formed, and the belt-like member is detachably attached to the annular recess of the positioning portion.
According to such a configuration, the assembly is easy and the gasket is difficult to come off when it is integrally assembled.
Here, it is preferable that the positioning portion is composed of a plurality of divided bodies divided in the circumferential direction.
If the positioning portion is constituted by such a divided body, the material is not enlarged and can be formed from a small material.
In the present invention, the divided body may be directly fixed to the seal portion body.

Moreover, in this invention, it is preferable that the said division bodies are integrated by welding.
Thus, if it integrates by welding, it can prevent coming off later.
Furthermore, the divided bodies may be integrated by press-fitting the concave-convex fitting portion.

Such a configuration eliminates the need for welding and can be manufactured at low cost.
Moreover, in this invention, it is preferable that the said positioning part is comprised by winding metal strip | belt-shaped members.
With such a configuration, the size of the positioning portion can be adjusted as appropriate depending on the number of windings of the belt-shaped member, and any size can be easily accommodated.
Furthermore, in the present invention, it is preferable that the positioning portion is composed of at least two rod-like members arranged substantially radially outward from the seal portion main body.
With such a configuration, when positioning, the rod-shaped member can be fixed at an appropriate position.
In addition, a through hole is formed in the rod member in advance at a predetermined position in the rod member, and the screw member is inserted into the through hole, whereby the first member and the second member are inserted. You may position between.
With such a configuration, tightening and positioning can be performed simultaneously.

  According to the sawtooth gasket according to the present invention, the gasket main body is constituted by a combination of a seal portion main body and a positioning portion which are formed separately in advance, instead of being formed by cutting out from a large metal plate. The cost required for cutting can be greatly reduced, and the material is not wasted. Therefore, the cost is low, and the cost reduction effect is high particularly when the diameter is large.

Hereinafter, preferred embodiments of the present invention shown in the drawings will be described.
FIG. 1 shows a pipe joint equipped with a sawtooth gasket according to an embodiment of the present invention.

In this pipe joint 20, a sawtooth gasket 26 is provided between the first member 22 and the second member 24.
The sawtooth gasket 26 is tightened by a plurality of bolts 28.
As shown in the enlarged view of FIG. 2, the sawtooth gasket 26 is positioned with respect to the seal portion main body 32 in which the sawtooth-shaped concavo-convex portions 30 a are formed on both surfaces, and the first member 22 and the second member 24. The sealing portion main body 32 and the positioning portion 34 are formed by incorporating separately formed parts in advance.

The thickness T of the seal portion main body 32 is larger than the thickness t of the positioning portion 34.
In this embodiment, the seal portion main body 32 and the positioning portion 34 are formed separately in advance and then integrated by being fitted together. As shown in FIG. 1, when the serrated gasket 26 is mounted between the first member 22 and the second member 24, the outer peripheral surface 34a of the positioning portion 34 contacts the bolt 28 of FIG. Thus, positioning is performed between the first member 22 and the second member 24. Therefore, it is prevented that the position is inadvertently shifted at the time of mounting.
The assembly of the seal portion main body 32 and the positioning portion 34 can take various forms in addition to such simple engagement.

That is, FIG. 3 shows that a metal band-like member 36 that has been cross-shaped in advance is wound around the outer peripheral surface of the seal portion main body 32 a plurality of times and fixed by welding. It is a thing.
On the other hand, the outer positioning portion 34 is formed with an annular recess 38 having a substantially U-shaped cross section on the inner peripheral surface thereof, and the corners of the belt-like member 36 are pressed against the annular recess 38, so that they are separated from each other. It is closely attached so that there is no.

Even such a serrated gasket does not require cutting and can be easily increased in size.
FIG. 4 shows an example in which an annular groove 40 is formed on the outer peripheral surface of the seal portion main body 32, and an inner peripheral edge 34 b of the positioning portion 34 is fitted into the annular groove 40. In this case, as shown in FIG. 5, the positioning portion 34 is composed of a plurality of divided bodies 34c, and after the two divided bodies 34c and 34c abut each other, the abutting portions are integrated by welding. Can do. Or in order to ensure positioning, an uneven | corrugated fitting part may be provided in the end surface of the division bodies 34c and 34c, and after integrating with this uneven | corrugated fitting part, you may weld.

  Further, the coupling between the annular groove 40 and the inner peripheral edge 34b of the positioning portion 34 is not particularly limited to welding, and may be fixed by other means such as brazing or adhesion. Further, as another means, the dimensional difference between the thickness of the positioning portion 34 and the annular groove 40 may be set small, and the positioning portion 34 may be pressed into the annular groove 40 to fix both.

Further, as a modified example of the divided body, as shown in FIG. 6, a positioning portion 34 having a slit 34d formed in part is formed, and the slit 34d is opened and fitted to the outer periphery of the seal portion main body 32. May be combined. Also in this case, after fitting, the slit portion 34d can be joined by welding.
Alternatively, in the case of FIG. 6, for example, the interval between the slit portions 34d may be increased in advance, and after the fitting, it may be mechanically tightened and fixed so that the interval between the 34 portions becomes narrower.

  Further, as shown in FIG. 7, the positioning portion 34 is formed of a band-shaped member 36 that is shaped like a dogleg, and the outer diameter is adjusted by adjusting the number of windings of the band-shaped member 36. The dimension D is set.

8A and 8B, an annular groove 46 is formed on the outer peripheral surface of the seal portion main body 32, and a substantially hexagonal metal wire 48 is mounted in the groove 46. Thus, a positioning member corresponding to the positioning portion 34 is configured.
In this case, in FIG. 8, the metal wire 48 has a hexagonal shape, but is not particularly limited to a hexagonal shape, and may have another polygonal shape. In the case of the present embodiment, the metal fine wire 48 is positioned by hitting the corner of the fine metal wire 48 against the gasket mounting groove side wall of the flange.

  In this case, the metal wire 48 is provided with a slit 48a in a part thereof, and the slit 48a is opened and attached to the groove 46 as shown in FIG. 8B. Note that the slit 48a is welded after being mounted.

  Alternatively, since the metal wire 48 can be bent to some extent, it can be welded in advance into a polygonal shape, and the fine metal wire 48 integrated into the polygonal shape can be attached to the concave groove 46 while being bent. it can.

Further, as shown in FIG. 9, at least two rod-shaped members 52 can be directly fixed radially outwardly outward from the seal body 32. Thus, if the positioning part 34 is directly fixed to the seal part main body 32, it is not necessary to integrate the positioning members 34 with each other.
The rod-like member 52 in the present embodiment includes the concept of a plate-like member having a certain width.

  Thus, in the present invention, the gasket 60 may be used as the positioning portion 34 by the rod-like member 52 or the plate-like member. In such a gasket 60, as shown in FIG. 10, the rod-shaped member 52 is abutted in the concave groove of the inner flange 24 a formed in the second member 24. Thereby, positioning is made.

Furthermore, as shown in FIG. 11 (A), for example, two flat plates 56 are arranged substantially linearly outside the seal portion main body 32, and the positioning portion 34 is constituted by the flat plates 56, and the flat plate 56 the bolt holes 58 provided, the bolt 28 shown in FIG. 1 into the bolt holes 58 are inserted, can be positioned. With this setting, the gasket can be positioned simultaneously with the attachment of the first member 22 and the second member 24.

Further, as shown in FIG. 11B, only one flat plate bolt hole 58 ′ may be a semicircle.
As mentioned above, although the preferable embodiment of this invention was demonstrated, this invention is not limited to the said Example at all. For example, in the present invention, for example, in the embodiment shown in FIGS. 9 and 11 (A) and (B) in addition to the embodiment shown in FIGS. 4 and 5, a groove is formed on the seal portion body side, The rod-shaped member 52 or the flat plate 56 can also be fixed by press-fitting into this groove.

  Thus, in the present invention, the outer positioning portion can be mounted on the inner seal body by various means, and the present invention is not limited to the embodiment.

FIG. 1 is a cross-sectional view of a pipe joint equipped with a sawtooth gasket according to an embodiment of the present invention. 2 is an enlarged cross-sectional view of the sawtooth gasket shown in FIG. FIG. 3 is a schematic half sectional view of a sawtooth gasket according to another embodiment of the present invention. FIG. 4 is a schematic half sectional view of a sawtooth gasket according to still another embodiment of the present invention. FIG. 5 is a schematic half sectional view showing the assembly structure of the flange portion shown in FIG. FIG. 6 is a schematic plan view of a sawtooth gasket according to still another embodiment of the present invention. FIG. 7 is a schematic half sectional view of a sawtooth gasket according to still another embodiment of the present invention. FIG. 8 shows a sawtooth gasket according to still another embodiment of the present invention. FIG. 8 (A) is a schematic half sectional view thereof, and FIG. 8 (B) is a schematic plan view thereof. FIG. 9 is a schematic plan view of a sawtooth gasket according to still another embodiment of the present invention. FIG. 10 is a half sectional view showing an example of mounting the sawtooth gasket shown in FIG. 11A and 11B are schematic plan views of sawtooth gaskets according to still another embodiment of the present invention. FIG. 12 is a cross-sectional view of a conventional sawtooth gasket.

Explanation of symbols

22 first member 24 second member 24a inner flange 26 sawtooth gasket 28 bolt 30a sawtooth uneven portion 32 seal portion main body 34 positioning portion 34a outer peripheral surface 34b inner peripheral edge 34c split body 34d slit 36 38 Annular recess 40 in the shape of a dog-shaped ring 46 Annular groove 46 Annular groove 48 Fine metal wire 48a Slit 52

Claims (5)

Interposed between the first flange member and the second flange member;
Serrated irregular portion formed on the gasket body, a first serrated gasket sealing force is exerted flange member side of the sealing surface and bite each sealing surface of the second flange member side,
The gasket body is
A metal seal portion main body in which the serrated irregularities are formed, and the seal portion main body formed separately from the seal portion main body on the outer peripheral side of the seal portion main body, and the first flange member and the second flange a metal positioning portion for positioning against member, consists Rutotomoni,
The sawtooth gasket, wherein the positioning portion is composed of a plurality of divided bodies divided in the circumferential direction.   A band-shaped member made of metal and shaped like a substantially cross-section is wound around the outer peripheral surface of the seal portion body, and an annular recess having a cross-section is formed on the inner peripheral surface of the positioning portion. The sawtooth gasket according to claim 1, wherein the band-like member is detachably mounted in the annular recess of the positioning portion. The sawtooth gasket according to claim 1 , wherein the divided body is directly fixed to the seal portion main body. The sawtooth gasket according to claim 1 , wherein the divided bodies are integrated by welding. The sawtooth gasket according to claim 1 , wherein the divided bodies are integrated by press-fitting the concave and convex fitting portion.

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