JP3104291U - Gasket for piping - Google Patents

Abstract

An object of the present invention is to provide a gasket for piping, which has high sealing performance, hardly causes settling, can prevent generation of fragrance and transfer fragrance, and can prevent contamination of products flowing in the piping.
A pipe-shaped gasket for a pipe having a predetermined width dimension disposed between a plurality of pipe members through which a fluid flows and sealing a joint between the two pipe members. The inner end portion on the center side in the radial direction is formed of a highly resistant resin material.
[Selection diagram] Fig. 1

Description

  The present invention relates to a gasket for piping, and more particularly to a gasket for piping that seals a joint between pipes through which a liquid for food flows.

  2. Description of the Related Art Conventionally, in fluid food plants for milk, tea, cola, fruit juice drinks, and the like, a gasket for piping has been used to seal a joint between stainless steel pipes. And made of synthetic rubber such as NBR.

  Since the synthetic rubber gasket has elasticity, it has a higher sealing performance than a resin or metal gasket, but has a drawback that its tissue structure is coarser than a resin or metal gasket.

  In recent food production plants, many kinds of products are mostly produced in one plant. However, in the piping using the synthetic rubber gasket, since the rubber has a rough structure, the flavoring is not possible. When used for a long period of time, the rubber will deteriorate and cracks will occur on the surface, and in some cases it may be mixed into the product by peeling off or missing partly In addition, there is a problem that it causes product contamination.

  On the other hand, in recent years, a gasket for piping formed only of the above-mentioned PTFE has been used. However, in the gasket for piping formed only of the PTFE, it is necessary to solve the problem of the gasket made of the synthetic rubber. However, because of poor elasticity such as synthetic rubber, the sealing performance may be deteriorated, and a strong tightening force is required at the time of mounting, so that there is a problem that it is difficult to handle.

  Therefore, as shown in FIG. 3, a gasket 32 has been proposed that utilizes the characteristics of both the synthetic rubber 30 and the high-resistance resin 31. That is, the gasket 32 in which the gasket main body 33 is formed of the synthetic rubber 30 and the seal side portion 35 of the gasket main body 33 is covered with the high-resistance resin 31 has been used.

  However, the gasket for piping having a structure in which the seal side portion 35 of the gasket main body 33 made of synthetic rubber is covered with the highly resistant resin 31 has the following problems.

  In the conventional gasket 30 for piping, in the gasket main body 33, at the seal side 35 where the liquid flows and needs to be sealed, the protrusion 36 of the gasket main body 33 protrudes along the liquid direction. When a load generated by the liquid flowing through the inside of the government and acting on the projecting portion 36 or the temperature of the liquid is applied to the projecting portion 36 or the temperature of the liquid is applied, the projecting portion made of synthetic rubber is used. The gasket main body 33 including the portion 36 and the like undergoes deformation such as thermal contraction or deformation due to stress or temperature.

In this case, the gasket body 33 returns to its original shape because the material itself is rich in elasticity and flexibility when the action of the external load or temperature as described above is eliminated. Since the high-resistance resin 31 to be coated does not have elasticity and flexibility as synthetic rubber, the high-resistance resin 31 does not return to the original shape similarly to the gasket main body 33.
Therefore, when the gasket main body 33 returns to the original shape, the high-resistance resin 31 becomes an obstacle and cannot return to the original shape of the pipe gasket 30. As a result, the sealing performance is reduced, and In some cases, liquid leakage may occur in the part.

Further, since the size, diameter, and the like of the gasket 30 for piping are standardized, the gasket body is formed of synthetic rubber as described above, and the gasket body is covered with the highly resistant resin 31. In such a case, the thickness of the synthetic rubber is reduced by the thickness of the high-resistance resin 31, and as a result, the load generated by the liquid circulation or the change in temperature as described above causes aging. And the sealing performance of the pipe is deteriorated, and leakage of the liquid flowing through the inside of the pipe may occur.

  Accordingly, an object of the present invention is to improve the sealing performance at a pipe connection portion of a gasket for a pipe formed by coating a surface of a seal side of a gasket body formed of a synthetic rubber with a highly resistant resin, and to improve a liquid flowing through the inside. It is an object of the present invention to provide a gasket for piping that can prevent leakage of gas.

In order to solve the above-mentioned problem, a gasket for piping according to the present invention according to claim 1 has a predetermined width that is disposed between a plurality of pipe members through which a fluid flows and seals a joint between both pipe members. A pipe-shaped gasket formed in a ring shape having dimensions, wherein a radially central inner end portion is formed of a highly resistant resin material.

  That is, in the gasket for piping according to the present invention, the portion that comes into contact with the fluid, that is, the inner end portion on the center side in the radial direction has the characteristics of the highly resistant resin material.

  In addition, the gasket for piping according to the present invention according to claim 2 is disposed along the radial direction of the pipe member between the plurality of flange portions of the pipe member, and a joint surface of both pipe members to the flange portion. A base having a locking portion that bulges laterally from the center of both joining surfaces of the base, and a hook that is bent at the outer end of the base and engages with the outer periphery of the flange. It is characterized by having.

  Therefore, according to the second aspect of the present invention, the provision of the hook portion enables the engagement with the pipe member.

  In the gasket for piping according to the third aspect of the present invention, the locking portion, a base portion located outside the pipe from a portion corresponding to the locking portion, and the hook portion are formed of an elastic material. The surface of the locking portion is coated with a high-resistance resin material, and the base located on the inner side of the pipe with respect to the locking portion is formed of a high-resistance resin material.

That is, in the gasket for piping according to the present invention, the locking portion, the base portion located on the outer side of the pipe from the portion corresponding to the locking portion, and the hook portion are formed of an elastic material. Rich in elasticity and flexibility. Further, since the locking portion is formed at a portion close to the inside of the pipe, it is covered with a highly resistant resin.
As a result, the locking portion has both characteristics of the elastic material and the high-resistance resin material. Further, the base located on the inner side of the pipe from the locking portion has the characteristics of a highly resistant resin material.

  Further, the gasket for piping according to the present invention according to claim 4 is characterized in that the base formed of the elastic material has an extending portion extending inward from a portion corresponding to the locking portion. I do.

  That is, in the gasket for piping according to the present invention, since the extension formed at the portion closest to the liquid flowing inside the pipe is formed of a high-resistance resin, the liquid through which the elastic material flows Never touch.

  According to a fifth aspect of the present invention, there is provided a gasket for piping according to the present invention, wherein a synthetic rubber is used as the elastic material, and a resin such as PTFE is used as the highly resistant resin material.

  That is, in the gasket for piping according to the present invention, both the elastic material and the high-resistance resin material can be easily obtained and easily processed.

The pipe gasket according to the first aspect of the present invention is formed in a ring shape having a predetermined width dimension which is arranged between a plurality of pipe members through which a fluid flows and seals a joint between the two pipe members. A gasket for piping that has a radially centered inner end portion made of a highly resistant resin material, and no elastic material is used at the inner end portion. Therefore, the elastic material is less likely to be affected, and it is possible to prevent deterioration of the sealing performance due to so-called settling of the elastic material over time.
Further, in the case where a pipe gasket made of an elastic material is conventionally used, it is possible to prevent a situation in which a scent or a scent of a fluid is generated at an inner end portion. In addition, in the years, cracks do not occur on the surface at the inner end portion, and there is no situation where a part is peeled or dropped, so that the peeled pieces are mixed into the product and cause product contamination. This problem is also solved.
Further, since the deformation of the inner end portion due to the load is small, the protruding portion is not formed and remains inside the pipe, and does not hinder the cleaning.

In addition, the gasket for piping according to the present invention according to claim 2 is disposed along the radial direction of the pipe member between the plurality of flange portions of the pipe member, and a joint surface of both pipe members to the flange portion. A base having a locking portion that bulges laterally from the center of both joining surfaces of the base, and a hook that is bent at the outer end of the base and engages with the outer periphery of the flange. Because of this, it is locked and securely fixed between the flanges formed at the open ends of the two pipe members.
Further, when the pipe is joined, the work is fixed to the pipe by the locking portion and the hook portion, so that the workability of attaching to the pipe is improved.

  In the gasket for piping according to the third aspect of the present invention, the locking portion, a base portion located outside the pipe from a portion corresponding to the locking portion, and the hook portion are formed of an elastic material. The surface of the locking portion is covered with a high-resistance resin material, and the base located on the inner side of the pipe from the locking portion is formed of a high-resistance resin material. It can have both advantages.

In other words, the sealing performance can be improved by the good deformability of the elastic material, and the characteristic property of the elastic material, that is, the rough structure of the elastic material, is compensated for by the highly resistant resin material. Occurrence can be prevented.
Further, the high-resistance resin material also eliminates the problem that the elastic material is deteriorated to cause cracks on the surface, or a part of the material is peeled or missing and mixed into the product, thereby causing product contamination.

  Further, in the gasket for piping according to the present invention according to claim 4, since the base formed of the elastic material has an extending portion extending inward from a portion corresponding to the locking portion, At the base inside the locking part, the half on the locking part side has the advantages of both the elastic material and the high-resistance resin material, and the half on the anti-locking part side has the high resistance resin material. Fragrance hardly deteriorates and fragrance and transfer scent can be prevented.

  Further, the gasket for piping according to the present invention according to the present invention uses synthetic rubber as the elastic material and a resin such as PTFE as the highly resistant resin material, so that it can be easily manufactured at low cost. A product having the above performance can be formed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the pipe gasket 1 according to the present embodiment is disposed between a plurality of pipe members 2, 3 through which a fluid flows, and forms a joint between the two pipe members 2, 3. A ring-shaped pipe gasket 1 having a predetermined width dimension to be sealed, and an inner end portion on the center side in the radial direction is formed of a high-resistance resin material 13.

Also, as shown in FIGS. 1 and 2, between the plurality of flange portions 4 and 5 of the pipe members 2 and 3 are arranged along the radial direction of the pipe members 2 and A base 8 having joining surfaces 6 and 7 to the flanges 4 and 5 of the base, locking portions 9 and 10 bulging laterally from the center of both joining surfaces 6 and 7 of the base 8, and the base 8 It has a hook portion 11 which is bent at the outer end of the tube and is engaged with the outer peripheral portions of the flange portions 4 and 5.

As shown in FIG. 1, the locking portions 9, 10, the base 8 located on the outer side of the tube with respect to the portions corresponding to the locking portions 9, 10 and the hook portion 11 are formed of an elastic material 12. On the other hand, the surfaces of the locking portions 9 and 10 are covered with a high-resistance resin material 13, and the base 8 located on the inner side of the pipe from the locking portions 9 and 10 is formed of the high-resistance resin material 13. .
Further, as shown in FIG. 2, the base 8 formed of the elastic material 12 has an extending portion 14 extending inward from a portion corresponding to the locking portions 9 and 10.
Further, a synthetic rubber 15 is used as the elastic material 12, and a resin such as PTFE is used as the highly resistant resin material 13.

  As shown in FIG. 1, the pipe gasket 1 according to the first embodiment is formed between a plurality of stainless steel tubes through which fluid foods such as milk, tea, cola, and juice drink flow. And has a role of sealing the joint portion of the two pipe members 2 and 3.

  As shown in FIG. 1, the pipe gasket 1 is formed in a ring shape having a predetermined width by using a synthetic rubber 15 as an elastic material 12 and a PTFE resin as a highly resistant resin material 13. .

  As shown in FIG. 1, the pipe gasket 1 has a plate-shaped base 8 having bonding surfaces 6 and 7 to the flange portions 4 and 5 of both pipe members 2 and 3, and both bonding surfaces of the base 8. It has locking portions 9 and 10 bulging in the shape of a circular arc from the central portion of 6 and 7, and a hook portion 11 formed in a hook shape at the outer end of the base portion 8 on the tube side. It is configured.

  As shown in FIG. 1, the pipe gasket 1 is disposed between the flange portions 4 and 5 of the pipe members 2 and 3 along the radial direction of the pipe members 2 and 3. That is, in the pipe gasket 1, the joint surfaces 6, 7 on both sides of the base 8 contact the end faces 17, 18 of the flanges 4, 5 of the two pipe members 2, 3, and the locking section 9. , 10 are engaged with arc-shaped concave portions 19, 20 formed on the end faces 17, 18 of the flange portions 4, 5, and the hook portion 11 is engaged with the outer peripheral portion of one flange portion 5. I have.

  As shown in FIG. 1, the pipe gasket 1 is configured such that the locking portions 9, 10, the base 8 located on the outer side of the pipe with respect to the portions corresponding to the locking portions 9, 10, and the hook portion 11 are elastic. It is formed of a synthetic rubber 15 which is the material 12, and its surface is not covered with another material.

  As shown in FIG. 1, the piping gasket 1 has a surface of the locking portions 9 and 10 formed of a synthetic rubber 15 as an elastic material 12 covered with a PTFE resin 16 as a highly resistant resin material 13. I have.

  As shown in FIG. 1, in the piping gasket 1, the base 8 located on the inner side of the pipe with respect to the locking portions 9 and 10 is formed only of a PTFE resin 16 which is a high-resistance resin material 13. That is, in the pipe gasket 1, the inner end portion on the center side in the radial direction is formed of the PTFE resin 16 which is the high-resistance resin material 13.

  The outer peripheral portions of the flange portions 4 and 5 of the two pipe members 2 and 3 sandwiching the piping gasket 1 therebetween are fixed by being engaged with the clamp band 21. That is, the clamp band 21 is formed of stainless steel in a shape having a groove portion 22 on the inner peripheral surface portion, and the combined flange portions 4 and 5 are fitted into and engaged with the groove portion 22.

Hereinafter, the operation of the pipe gasket 1 according to the present embodiment will be described.
In the pipette 1 according to the present embodiment, the inner end portion of the base portion 8 as a portion that comes into contact with the food liquid flowing inside the pipes of the pipe members 2 and 3 is entirely formed of PTFE resin. As a result, since the tissue structure is denser than that of the case where it is formed of conventional synthetic rubber, it is possible to prevent a situation in which the smell of another type of food liquid adheres to the liquid. In addition, deterioration during aging is small, and situations such as cracking and peeling can be prevented.

Further, since the central portion and the outer end portion of the base are formed of synthetic rubber as in the conventional case, even if there is a change in the shape of expansion and contraction due to a load generated from the flowing liquid and a change in temperature, it is possible. Due to the high flexibility, the shape can be effectively restored, and the sealing performance does not deteriorate even after aging.
Furthermore, since the synthetic rubber 15 does not exist in the part directly in contact with the flowing liquid and in the part adjacent thereto, the synthetic rubber 15 is less susceptible to the liquid pressure change and the temperature change of the liquid as compared with the conventional structure, The occurrence of load deformation or temperature deformation of the synthetic rubber can be reduced.

  As shown in FIG. 2, the pipe gasket 1 according to the second embodiment is formed between a plurality of stainless steel members through which fluid foods such as milk, tea, cola, and juice drink flow. And has a role of sealing the joint between the two pipe members 2 and 3.

  As shown in FIG. 2, the pipe gasket 1 is formed in a ring shape having a predetermined width by using a synthetic rubber 15 which is an elastic material 12 and a PTFE resin which is a highly resistant resin material 13. .

  As shown in FIG. 2, the pipe gasket 1 has a plate-like base 8 having joint surfaces 6 and 7 to the flange portions 4 and 5 of the two pipe members 2 and 3, and both joint surfaces of the base 8. It has locking portions 9 and 10 bulging in the shape of a circular arc from the central portion of 6 and 7, and a hook portion 11 formed in a hook shape at the outer end of the base portion 8 on the tube side. It is configured.

  As shown in FIG. 2, the pipe gasket 1 is disposed between the flange portions 4 and 5 of the pipe members 2 and 3 along the radial direction of the pipe members 2 and 3. That is, in the pipe gasket 1, the joint surfaces 6, 7 on both sides of the base 8 are brought into contact with the end faces of the flanges 4, 5 of the pipe members 2, 3, 17 and 18, and the locking portion 9 and 10 are engaged with arc-shaped concave portions 19 and 20 formed on the end surfaces 17 and 18 of the flange portions 4 and 5, and the hook portion 11 is engaged with the outer peripheral portion of one flange portion 5. ing.

  As shown in FIG. 2, the pipe gasket 1 is configured such that the locking portions 9, 10, the base 8 located on the outer side of the pipe with respect to the portions corresponding to the locking portions 9, 10, and the hook portion 11 are elastic. It is formed of a synthetic rubber 15 which is the material 12, and its surface is not covered with another material.

  As shown in FIG. 2, the piping gasket 1 has a surface of the locking portions 9 and 10 formed of a synthetic rubber 15 as an elastic material 12 covered with a PTFE resin 16 as a highly resistant resin material 13. I have.

As shown in FIG. 2, the piping gasket 1 has only a PTFE resin 16 whose inner end portion is a high-resistance resin material 13 at a base portion 8 located on the pipe inner side of the locking portions 9 and 10. The outer side of the tube is formed of a PTFE resin 16 which is a highly resistant resin material 13 on the surface side, and a synthetic rubber 15 which is an elastic material 12 inside thereof. That is, the portion formed of the elastic material 12 in the engaging portions 9 and 10 has an extending portion 14 extending inward of the pipe, and the surface of the extending portion 14 is covered with the high-resistance resin material 13. ing.
That is, the gasket 1 for piping has an inner end portion on the center side in the radial direction formed of only the PTFE resin 16 which is the high-resistance resin material 13.

  The outer peripheral portions of the flange portions 4 and 5 of the two pipe members 2 and 3 sandwiching the piping gasket 1 therebetween are fixed by being engaged with the clamp band 21. That is, the clamp band 21 is formed of stainless steel so as to have a groove 22 on the inner peripheral surface, and the flanges 4 and 5 combined with the groove 22 are fitted.

  Therefore, in the gasket 1 for piping according to the present embodiment, since the extending portion 14 is formed of synthetic rubber, the flexible rubber is provided at the inner end portion of the gasket close to the liquid. Since these portions are formed, it is possible to more reliably absorb the load and temperature changes generated from the liquid as compared with the above embodiment.

  The gasket for piping according to the present invention can be applied to piping for which it is necessary to seal joints between a plurality of pipe members through which a fluid flows.

FIG. 3 is a sectional view of the first embodiment. FIG. 9 is a cross-sectional view of the second embodiment. It is sectional drawing of a prior art example.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Gasket for piping 2 Pipe member 3 Tube member 4 Flange part 5 Flange part 6 Joint surface 7 Joint surface 8 Base 9 Lock part 10 Lock part 11 Hook part 12 Elastic material 13 High resistance resin 14 Extension part 15 Synthetic rubber 16 PTFE resin 17 End face 18 End face 19 Recess 20 Recess 21 Clamp band 22 Groove 30 Synthetic rubber 31 High resistance resin 32 Gasket 33 Gasket main body 35 Seal side 36 Projection

Claims (5)

A pipe-shaped gasket formed in a ring shape having a predetermined width dimension that is disposed between a plurality of pipe members through which fluid flows and seals a joint between both pipe members,
A gasket for piping, wherein an inner end portion on the center side in the radial direction is formed of a highly resistant resin material.   A base disposed between the plurality of flanges of the pipe member along the radial direction of the pipe member and having a joint surface to the flange portions of both the pipe members, and bulging laterally from both joint surfaces of the base. 2. The gasket for piping according to claim 1, further comprising: a locking portion that engages; and a hook portion that is bent at the outer end of the base portion and that engages with an outer peripheral portion of the flange portion.   The hook portion, the base portion, and the locking portion are formed of an elastic material, while the surface of the locking portion is coated with a high-resistance resin material, and the base portion located on the inner side of the pipe with respect to the locking portion has high resistance. The gasket for piping according to claim 2, wherein the gasket is formed of a resin material.   4. The gasket for piping according to claim 3, wherein the base portion formed of the elastic material has an extending portion extending inward of the pipe from a portion corresponding to the locking portion.   5. The gasket for piping according to claim 1, wherein a synthetic rubber is used as the elastic material, and a resin such as PTFE is used as the highly resistant resin material.

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