JP2004052817A - Flange packing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive flange packing capable of bringing an effective sealing property even under a high pressure or partial pressure condition. <P>SOLUTION: The flange packing is provided with a simple structure at low costs, in which a circular metallic member 9 is built in to a circular rubber packing body having seal surfaces at both sides along a circular shape of the packing body 8 and a metal ring 12 is fit on an outer periphery of the packing body 8. Based on actions for controlling deformation of a rubber member caused by the circular metallic member 9 and the metal ring 12 in the flange packing, a rubber member of the packing body 8 is prevented from sticking out or splitting off between the seal surfaces of flanges 2 and 5 even though they are used under conditions with high pressure fluid and partial pressure. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flange packing used for sealing when connecting flanges.
[0002]
[Prior art]
A connection using a pair of flanges is used at a connection portion of a portion where water (fluid) flows, such as a connection of a water supply system device and a connection of a piping member. Specifically, in the same structure, a flange is connected to each of the one cylindrical connection end and the other cylindrical connection end which form a connection part, and these flanges are butted, and the butted flanges are joined together. By fastening with bolts and nuts, both connecting ends are connected.
[0003]
Usually, such a flange connection seals so that fluid passing therethrough does not leak from between the flanges. In this seal structure, usually, a rubber flange packing entirely formed of a rubber member is interposed between the sealing surfaces of both flanges, and the flange packing is brought into close contact with the sealing surface by the fastening force provided by the bolt and nut. ing.
[0004]
[Problems to be solved by the invention]
However, since the rubber flange packing is entirely formed of a rubber member, when it is used under a heavy load, for example, when the fluid flowing through the inside is at a high pressure, or when the fastening force of the two flanges is reduced. When the pressure acts due to the variation, a part of the packing body may protrude from between the sealing surfaces of the flange, or a part of the packing body may be torn, so that the sealing property may not be maintained.
[0005]
When there is a risk of such protrusion or tearing, a metal gasket made entirely of a metal member is interposed between the sealing surfaces of both flanges instead of a rubber flange packing.
[0006]
However, this metal gasket provides high sealing properties because it withstands high pressure, but is very expensive, and thus has a difficulty in being adopted as a flange seal.
[0007]
Therefore, an object of the present invention is to provide a flange packing that can be manufactured at a low cost and provide high sealing performance even in a situation where high pressure or partial pressure is applied.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 includes a rubber member which is formed of a rubber member and has a sealing body along the annular shape of the packing body inside the annular packing body having sealing surfaces on both sides. An annular metal member is embedded so as to be attached to the member.
[0009]
As a result, even when the flange packing is used in a situation where a high-pressure fluid or a partial pressure is applied due to an action of suppressing a deformation of the rubber member caused by the annular metal member, the packing body protrudes from the gap between the seal surfaces or is torn. Is suppressed. In other words, the flange packing can achieve high sealing properties with a simple structure in which the annular metal member is simply embedded.
[0010]
Another aspect of the present invention is that the metal ring is fitted to the outer peripheral portion of an annular packing body formed of a rubber member and having sealing surfaces on both sides by being attached to the packing body.
[0011]
Accordingly, even when the flange packing is used in a situation where a high-pressure fluid or a partial pressure is applied by suppressing deformation of the rubber member caused by the metal ring, it is possible to suppress the packing main body from protruding or tearing from between the sealing surfaces. That is, the flange packing can achieve high sealing performance with a simple structure in which the metal ring is simply fitted.
[0012]
A third aspect of the present invention resides in that a plurality of annular projections are formed on each sealing surface of the packing main body along the annular shape of the packing main body so as to ensure a higher sealing property.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on a first embodiment shown in FIGS.
[0014]
FIG. 1 shows a part of a water supply system, for example, in which 1 is a piping member, for example, 2 is a flange connected to one end of the piping member 1, and 4 is a piping lined directly on one end side of the piping member 2. The members 5 indicate flanges connected to the other end of the distribution pipe member 4 facing one end of the pipe member 2.
[0015]
These flanges 2 and 5 are fastened by a plurality of bolts and nuts 6 (only one is shown in the drawing). A rubber flange packing 7 is interposed between the sealing surfaces 2a and 5a of the flanges 2 and 5 facing each other to seal between the two flanges 2 and 5 (a pair). The rubber flange packing 7 is devised.
[0016]
Describing the flange packing 7, reference numeral 8 denotes an annular packing body entirely formed of a rubber member. For example, the packing body 8 has a disk-like shape in which a flat rectangular cross section as shown in FIGS. 2A, 2B and 3 is formed in a ring shape and sealing surfaces 8a are formed on both sides. Structure is used. The packing body 8 is formed in a size matching the size of the sealing surfaces 2a and 5a of the flanges 2 and 5. An annular metal member, for example, an annular plate member 9 is embedded inside the packing body 8 along the annular shape of the packing body 8. More specifically, a circular plate member having an outer shape such that the cross-sectional shape of the packing body 8 is reduced is used as the annular plate member 9. When the packing body 8 is molded using a mold, the plate member 9 is embedded into the mold so that the entire packing body 8 is integrally molded. Thereby, the annular plate member 9 is embedded in the packing body 8 while being attached to the rubber member forming the packing body 8.
[0017]
When the flange packing 7 configured as described above is interposed between the flanges 2 and 5 fastened by the bolts and nuts 6, the sealing surfaces 8a on both sides are pressed against the flanges 2 and 5 by the elasticity of the rubber member. Sealing is performed by pressure bonding with the sealing surfaces 2a and 5a. At this time, the annular plate member 9 (metal member) has an effect of suppressing deformation of the rubber member, and suppresses the rubber member (rubber layer) from escaping to the outer peripheral side.
[0018]
Due to the function of the annular plate member 9, even when the flange packing 7 is used in a situation where a high-pressure fluid flows through the inside, a pressure biased to a specific portion of the flange packing 7 due to a variation in the tightening force of the bolt and nut 6. Even when the packing is used in a situation where there is a bias that causes distribution, the rubber portion (a portion formed of a rubber member) on the outer peripheral side of the packing body 8 protrudes from between the sealing surfaces 2a and 5a of the flanges 2 and 5. In addition, the problem that a part of the rubber portion of the outer peripheral portion is torn due to protrusion is prevented.
[0019]
Therefore, a high sealing property which cannot be obtained by the flange packing formed only of the rubber member is secured. Moreover, such an effect can be obtained with a simple and inexpensive structure in which the annular plate 9 is embedded in the packing body 8 formed of a rubber member.
[0020]
Therefore, the flange packing 7 providing high sealing performance can be provided at low cost.
[0021]
4A, 4B and 5 show a second embodiment.
[0022]
The present embodiment is a modified example of the first embodiment, in which, for example, a plurality of, for example, two annular protrusions having different sizes are provided around the axis of the packing body 8 as the sealing surfaces 8a on both sides of the packing body 8, for example. This adopts a sheet surface having portions 10a and 10b.
[0023]
If the sealing surface 8a has the projections 10a and 10b, a high surface pressure is applied between the projections 10a and 10b and the flanges 2 and 5, even if the fastening of the flanges 2 and 5 is not uniform. Therefore, there is an advantage that a high sealing property is ensured. In particular, when each of the annular projections 10a and 10b has a semicircular cross-sectional shape so as to make line contact with the flanges 2 and 5, high sealing performance is easily ensured.
[0024]
FIGS. 6A, 6B and 7 show a third embodiment. In the present embodiment, a structure in which the metal member is attached to the outer peripheral portion is realized, instead of the structure in which the metal member is buried as shown in the first and second embodiments, thereby realizing the sealing performance.
[0025]
That is, in the present embodiment, a metal member is attached to an outer periphery of an annular packing body formed of a rubber member, for example, a packing body 8 having a flat rectangular cross section formed in a ring shape as described in the first embodiment. That is, this is a structure in which a metal ring 12 formed of a metal member and formed in an annular (short tubular) shape is provided. As the metal ring 12, a part having a length t2 smaller than the thickness t1 of the packing body 8 is used so as not to impair the sealing performance. For example, when the packing body 8 is formed using a mold, the metal ring 12 is inserted into the outer periphery of the mold to form the entirety of the packing body 8 integrally with the metal ring 12 as in the first embodiment. Structure is used. Thereby, the metal ring 12 is fitted to the outer peripheral portion of the packing body 8 while being attached to the rubber member forming the packing body 8.
[0026]
When the flange packing 7 configured as described above is interposed between the flanges 2 and 5 fastened by the bolts and nuts 6, the sealing surfaces 8a on both sides are pressed against the flanges 2 and 5 by the elasticity of the rubber member. Sealing is performed by pressure bonding with the sealing surfaces 2a and 5a. At this time, the annular metal ring 12 has an effect of suppressing deformation of the rubber member, and suppresses the rubber member (rubber layer) from escaping to the outer peripheral side.
[0027]
Due to the function of the metal ring 12, similarly to the first embodiment, even when the flange packing 7 is used in a situation where a high-pressure fluid flows through the inside thereof, the flange packing 7 has a variation in the tightening force of the bolt and nut 6. Even when used in a situation where a biased pressure that causes a biased pressure distribution to a particular portion is generated, the rubber portion (portion formed of a rubber member) on the outer peripheral side of the packing body 8 is sealed by the sealing surfaces 2a of the flanges 2 and 5. , 5a, or a part of the rubber portion on the outer peripheral portion is torn by the protrusion to prevent the trouble.
[0028]
Therefore, a high sealing property which cannot be obtained by the flange packing formed only of the rubber member is secured. Moreover, such an effect can be obtained with a simple and inexpensive structure in which the metal ring 12 is provided on the outer peripheral portion of the packing body 8 formed of a rubber member.
[0029]
Therefore, similarly to the first embodiment, the flange packing 7 that provides high sealing performance can be provided at low cost.
[0030]
8A, 8B and 9 show a fourth embodiment.
[0031]
This embodiment is a modified example of the third embodiment. Similar to the above-described second embodiment, each of the sealing surfaces 8a on both sides of the packing main body 8 has, for example, a plurality of sealing surfaces 8a around the axis of the packing main body 8. For example, a sheet surface having two annular projections 10a and 10b having different sizes is adopted. In addition, since the convex portions 10a and 10b form the sheet surface 8a, the metal ring 12 is made of a component whose length is smaller than the height of the convex portions 10a and 10b so as not to impair the sealing performance. is there.
[0032]
When the sealing surface 8a has the projections 10a and 10b in this manner, high sealing performance is ensured as in the second embodiment. Each of the annular projections 10a and 10b has a semicircular cross-sectional shape so that line contact is made between the flanges 2 and 5, and has a structure that ensures high sealing performance.
[0033]
However, in the second to fourth embodiments, the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0034]
The present invention is not limited to the above-described embodiment, and may be implemented with various modifications without departing from the gist of the present invention. For example, in the second embodiment, an example in which an annular flat plate is used has been described. However, for example, a plate in which a plate portion is bent concentrically in a circular waveform is used, and A convex portion for sealing may be formed using the portion. Further, in each of the above-described embodiments, the structure in which the flanges connecting the pipes are sealed with the flange packing is described. However, the present invention is not limited to this, and the seal between the flange of the device and the flange combined therewith may be used. Is not limited to the place where it is used.
[0035]
【The invention's effect】
As described above, according to the first and second aspects of the present invention, the annular metal member or the metal ring is used in a situation where a high-pressure fluid or a partial pressure is applied due to an action of suppressing deformation of the rubber member caused by the metal ring. Even if this is done, it is possible to suppress the packing body from protruding or tearing between the sealing surfaces of the flange. Moreover, a simple structure in which an annular metal member or a metal ring is combined with the rubber packing body may be used.
[0036]
Therefore, it is possible to provide a flange packing that is inexpensive and can ensure high sealing performance.
[0037]
According to the third aspect of the present invention, in addition to the above-described effects, the sealing surface of the packing body is formed to have a plurality of annular projections, so that even if the tightening force of the flange varies greatly, high sealing performance is obtained. The effect that it can secure is produced.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a flange packing according to a first embodiment of the present invention together with a flange structure to which the packing is attached.
FIG. 2A is a front view of a flange packing.
(B) is a side sectional view similarly.
FIG. 3 is an enlarged cross-sectional view showing a portion A in FIG. 2 (b).
FIG. 4A is a front view of a flange packing according to a second embodiment of the present invention.
(B) is a side sectional view similarly.
FIG. 5 is an enlarged sectional view showing a portion B in FIG. 4 (b).
FIG. 6A is a front view of a flange packing according to a third embodiment of the present invention.
(B) is a side sectional view similarly.
FIG. 7 is an enlarged sectional view showing a portion C in FIG. 6 (b).
FIG. 8A is a front view of a flange packing according to a fourth embodiment of the present invention.
(B) is a side sectional view similarly.
FIG. 9 is an enlarged cross-sectional view showing a D part in FIG. 8 (b).
[Explanation of symbols]
7 Flange packing 8 Packing body 8a Seal surface 9 Annular plate member (annular metal member)
10a, 10b ... convex part 12 ... metal ring.

Claims (3)

An annular packing body formed of a rubber member and having sealing surfaces on both sides,
A flange packing comprising a rubber member forming the packing body and an annular metal member embedded so as to be attached to the inside of the packing body along the annular shape of the packing body. An annular packing body formed of a rubber member and having sealing surfaces on both sides,
A metal ring attached to an outer peripheral portion of the packing main body and fitted to an outer peripheral portion of the packing main body. The flange packing according to claim 1 or 2, wherein each sealing surface of the packing body has a plurality of annular protrusions along the annular shape of the packing body.

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