JP5438730B2 - Sealing material - Google Patents

Description

  The present invention relates to a sealing material, and more particularly to a sealing material for a radioactive waste container suitable for use in a container for storing radioactive waste.

  Low-level radioactive waste generated from a nuclear power plant or the like is packed in a drum can and then solidified with concrete or the like, and the drum can is transported to a disposal site while being accommodated in a radioactive waste container.

  Such a radioactive waste container that accommodates and transports low-level radioactive waste has a large dimensional tolerance because it is manufactured mainly by cutting, processing, welding, or the like of metals such as iron and lead. For this reason, the sealing material used for the radioactive waste container is required to have a high compressibility and a high compressibility sufficient to absorb the dimensional tolerance.

  From such a background, as a sealing material for a conventional radioactive waste container, for example, a sealing material 100 for a radioactive waste container made of rubber sponge having a high compressibility as shown in FIGS. 17 and 18 is used. It has been. Here, FIG. 17 is a cross-sectional view showing a state in which a sealing material for a conventional radioactive waste container is mounted in a seal groove, and FIG. 18 is a diagram illustrating a sealing material for a conventional radioactive waste container with a lid. It is sectional drawing which showed the state which has sealed between the container main bodies.

  As shown in FIG. 17, the conventional rubber sponge sealing material 100 has a substantially square shape in cross-sectional view, and its cross section is formed in a hollow shape. The sealing material 100 is fixedly attached to the rectangular sealing groove 132 formed on the outer peripheral edge on the lower surface side of the lid 130 with an adhesive. When the container body is closed by the lid 130, the tip portion 140a of the side wall 140 of the container body presses the sealing material 100, and the sealing material 100 is deformed as shown in FIG. And the container body are sealed.

  However, since the conventional sealing material 100 made of rubber sponge is inferior in compression recovery property, when it is tightened with a high compressive force for a long period of time, a compression set called so-called sag occurs, and the sealing performance deteriorates. It was. For this reason, the lifetime of the sealing material 100 was short, and it was necessary to replace the sealing material frequently.

  Furthermore, as described above, since the sealing material 100 is fixed to the sealing groove 132 with an adhesive, it is difficult to remove the sealing material 100 from the sealing groove 132 when the sealing material is replaced. Further, even if the sealing material 100 can be removed, a great effort is required to remove the adhesive adhering to the sealing groove 132.

  The present invention has been made in view of the above-described conventional problems, and has high compressibility equivalent to that of a conventional rubber sponge sealing material, is less prone to settling, and is longer than the conventional sealing material. An object of the present invention is to provide a sealing material that can have a long life.

  Another object of the present invention is to provide a sealing material that can be fixed and attached to a seal groove without using an adhesive, and can be easily replaced.

The present invention was invented to solve the problems of the prior art as described above,
The sealing material of the present invention is
A seal material that seals between the first member and the second member by being attached to the seal groove formed in the first member and being pressed by the second member inserted into the seal groove. There,
The sealing material is formed in a hollow cross-section, and a recess is formed on the outer surface side of the upper surface portion of the sealing material that is oriented toward the bottom surface side of the seal groove, and the hollow portion of the sealing material is formed in the recess. An air hole communicating therewith is formed.

  The thus configured sealing material of the present invention is formed in a hollow cross section and has air holes communicating with the hollow portion. Therefore, when compressed by being pressed by the second member, the air in the hollow portion is discharged to the outside of the sealing material through the air holes, and thus has high compressibility that is greatly deformed with a small pressing force.

In the above invention,
The sealing material is formed of a solid rubber material.
Thus, if the sealing material of the present invention is formed of a solid rubber material instead of a rubber sponge, it is difficult to cause settling, and salt or rainwater in seawater does not enter, so contact with the sealing material The surface will not corrode.

In the above invention,
It is desirable that a drop-off preventing convex portion for narrowing the opening width of the seal groove is formed at the opening side end portion of the side surface of the seal groove.

  In this way, if a drop-off preventing convex portion that narrows the opening width of the seal groove is formed at the opening side end portion of the side surface of the seal groove, the seal material attached to the seal groove is prevented from falling off. It becomes possible to fix the sealing material of the present invention in the seal groove without using an agent.

In the above invention,
It is desirable that the drop-off preventing convex portion is formed by fixing another member in the seal groove.

  In this way, if another protrusion is formed by fixing another member in the seal groove, the drop prevention protrusion can be easily formed in the seal groove, rather than processing and deforming the seal groove itself to form the drop prevention protrusion. The part can be formed.

In the above invention,
It is desirable that a plurality of the air holes are formed at intervals with respect to the length direction of the sealing material.

By comprising in this way, it can be provided with the high compressibility which deform | transforms large with a small pressing force with respect to a long-sized sealing material or a cyclic | annular sealing material.
In the above invention,
It is desirable that an exhaust hole penetrating the first member is formed on the bottom surface of the seal groove at a position facing a recess formed in the upper surface portion of the seal material.

  If such an exhaust hole is formed through the first member, air discharged from the hollow portion of the sealing material can be discharged to the outside of the seal groove through the exhaust hole. In the sealing material, it is possible to more suitably exhibit high compressibility that greatly deforms with a small pressing force.

In the above invention,
In the seal groove, an exhaust groove that is continuous from the bottom surface of the seal groove at a position facing the concave portion formed in the upper surface portion of the seal material to the opening side end portion of the side surface of the seal groove is formed. Is desirable.

  If such an exhaust groove is formed in the seal groove, the air discharged from the hollow portion of the seal material can be discharged to the outside of the seal groove through the exhaust groove. The high compressibility which deform | transforms large with a small pressing force can be exhibited more suitably.

In the above invention,
It is desirable that a plurality of the exhaust grooves or the exhaust holes are formed at intervals with respect to the length direction of the seal groove.

If comprised in this way, the long compressive sealing material and the annular sealing material can exhibit the high compressibility which deform | transforms greatly with a small pressing force more suitably.
In the above invention,
It is desirable that a surface treatment for preventing the second member from sticking is applied to an outer surface of the lower surface portion of the sealing material with which the second member abuts.

  Thus, if the surface treatment for preventing the second member from sticking to the outer surface of the lower surface portion of the sealing material is performed, even if the sealing material is pressed by the second member over a long period of time, The outer surface of the lower surface portion of the sealing material and the second member do not adhere.

  In the present specification, the surface treatment for preventing the second member from sticking is a coating of various surface treatment agents for rubber made of fluorine resin, silicone resin, urethane resin, etc., lining of PTFE sheet, etc. , And halogen treatment.

In one embodiment of the above invention,
The lower surface portion of the sealing material is formed in a curved shape that bulges to the outer surface side.
Thus, if the lower surface part of the sealing material is formed in a curved shape bulging to the outer surface side, the sealing material of the present invention can be provided with high compressibility.

In one embodiment of the above invention,
The outer surface of the lower surface portion of the sealing material is formed in a curved shape that is recessed toward the inner surface side.
Thus, if the outer surface of the lower surface portion of the sealing material is formed in a curved shape that is recessed toward the inner surface side, it is possible to prevent the contact position between the lower surface of the sealing material and the second member from shifting.

In one embodiment of the above invention,
The lower surface portion of the sealing material is formed in a mountain shape in which the thickness decreases from the center portion to the end portion. At this time, the lower surface portion of the sealing material is a mountain shape that is convexly formed on the hollow portion side. It is desirable.

  Thus, if the lower surface portion of the sealing material is formed in a mountain shape whose thickness decreases from the central portion to the end portion, a large reaction force can be obtained in the central portion where the thickness is formed thicker. In addition, the end portion having a small thickness is easily deformed. For this reason, for example, even when the contact position of the second member is shifted to the left and right and the sealing material is deformed asymmetrically, a large reaction force can be obtained at the lower surface and the lower surface can be deformed. Since the pressing force acting on the sealing material is absorbed by this, abnormal deformation such as buckling can be prevented from occurring in the side surface portion. In addition, this effect is more prominent particularly when the lower surface portion of the sealing material is convexly formed on the hollow portion side.

In the above invention,
It is desirable that the side surface portion of the sealing material is formed so as to increase in thickness from the lower surface portion to the upper surface portion of the sealing material. At this time, a connection portion between the lower surface portion and the side surface portion of the sealing material It is desirable that the outer surface is formed in an R surface or a tapered surface.

  In this way, when the side surface portion of the sealing material is formed so as to increase in thickness from the lower surface portion to the upper surface portion of the sealing material, when the sealing material is compressed and deformed, a large reaction from the bottom surface of the sealing groove. A force can be obtained, and the side surface portion is easily deformed in accordance with the deformation of the lower surface portion. At this time, if the connecting portion between the lower surface portion and the side surface portion of the sealing material is formed on the R surface or the tapered surface, the side surface portion is more easily deformed in accordance with the deformation of the lower surface portion. Therefore, for example, even when the contact position of the second member is shifted left and right and the sealing material is deformed asymmetrically, a large reaction force can be obtained from the side surface portion, and the side surface can be adjusted in accordance with the deformation of the lower surface portion. Since the portion is also deformed, it is possible to prevent the side portion from deforming abnormally such as buckling due to excessive axial force acting on the side portion of the sealing material.

In the above invention,
It is desirable that the lower surface portion of the sealing material be formed wider than the width of the sealing groove. At this time, the outer surface of the side surface portion of the sealing material is directed from the lower surface portion of the sealing material to the upper surface portion. It is desirable to have an inward taper.

  Thus, if the lower surface portion of the sealing material is formed wider than the width of the sealing groove, the sealing material attached to the sealing groove is less likely to drop out of the sealing groove. At this time, if the outer surface of the side surface portion of the seal material is tapered inward from the lower surface portion to the upper surface portion of the seal material, the seal material can be easily mounted in the seal groove.

In the above invention,
It is desirable that the sealing material is used in a radioactive waste container that stores radioactive waste.

  Since the sealing material of the present invention has high compressibility and also has high compressibility, it can be suitably used as a sealing material for radioactive waste containers.

  According to the present invention, it has a high compressibility equivalent to that of a conventional rubber sponge sealing material, is less prone to occur, and does not corrode the seal groove due to the intrusion of salt or rainwater in seawater. Thus, it is possible to provide a sealing material that can have a longer life than conventional sealing materials.

  In addition, the present invention can provide a sealing material that can be fixed and attached to the seal groove without using an adhesive, and thus can be easily replaced.

FIG. 1 is a partially enlarged sectional view showing a lid of a container to which a sealing material of the present invention is attached. FIG. 2 is a cross-sectional view showing the sealing material of the first embodiment of the present invention. FIG. 3 is a cross-sectional view showing a state in which the sealing material according to the first embodiment of the present invention is mounted in the seal groove. FIG. 4 is a cross-sectional view showing a state in which the sealing material according to the first embodiment of the present invention seals between the lid and the container main body. FIG. 5 is a cross-sectional view showing a state in which the sealing material according to the first embodiment of the present invention is attached to the seal groove in which the exhaust groove is formed and seals between the lid and the container body. is there. FIG. 6 is a cross-sectional view showing a sealing material according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view showing a state in which the sealing material according to the second embodiment of the present invention is mounted in the seal groove. FIG. 8 is a cross-sectional view showing a state where the sealing material of the second embodiment of the present invention seals between the lid and the container body. FIG. 9 is a cross-sectional view showing a sealing material according to a third embodiment of the present invention. FIG. 10 is a cross-sectional view showing a state in which the sealing material of the third embodiment of the present invention is mounted in the seal groove. FIG. 11 is a cross-sectional view showing a state where the sealing material of the third embodiment of the present invention seals between the lid and the container body. FIG. 12 is a cross-sectional view showing a sealing material according to a fourth embodiment of the present invention. FIG. 13 is a cross-sectional view showing a state where the seal material of the fourth embodiment of the present invention is mounted in the seal groove. FIG. 14 is a cross-sectional view showing a state in which the sealing material according to the fourth embodiment of the present invention seals between the lid and the container body. FIG. 15 is a cross-sectional view showing a state in which the sealing material according to the fourth embodiment of the present invention is deformed asymmetrically. FIG. 16 is a cross-sectional view showing an example in which the outer surface of the connecting portion between the lower surface portion and the side surface portion of the sealing material is formed in a taper shape in the sealing material according to the fourth embodiment of the present invention. FIG. 17 is a cross-sectional view showing a state in which a sealing material for a conventional radioactive waste container is mounted in a seal groove. FIG. 18 is a cross-sectional view showing a state in which a sealing material for a conventional radioactive waste container seals between the lid and the container body.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the present specification, the “upper surface portion” of the sealing material means the upper part of the sealing material 1 in the drawing, that is, the bottom surface side of the sealing groove 32 in a state where the sealing material 1 is mounted in the sealing groove 32. Refers to the portion to be oriented. The “lower surface portion” of the sealing material is oriented to the lower side of the sealing material 1 in the drawing, that is, the opening side of the sealing groove 32 in a state where the sealing material 1 is mounted in the sealing groove 32. Refers to the part.

FIG. 1 is a partially enlarged sectional view showing a lid of a container to which a sealing material of the present invention is attached.
As shown in FIG. 1, the sealing material 1 of the present invention is attached to a seal groove 32 formed in a first member (for example, the lid 30) and is inserted into the seal groove 32. The gap between the first member and the second member is sealed by being pressed by (for example, the distal end portion 40a of the side wall 40 of the container main body).
<First Embodiment>
FIG. 2 is a cross-sectional view showing the sealing material of the first embodiment of the present invention. FIG. 3 is a cross-sectional view showing a state in which the sealing material according to the first embodiment of the present invention is mounted in the seal groove. FIG. 4 is a cross-sectional view showing a state in which the sealing material according to the first embodiment of the present invention seals between the lid and the container main body.

  As shown in FIG. 2, the sealing material 1 of the present embodiment has a hollow cross-section that includes an upper surface portion 12, a lower surface portion 14, and side surface portions 16, 16 that connect the upper surface portion 12 and the lower surface portion 14. A hollow portion 10 having a substantially rectangular shape is formed at a substantially central portion of the sealing material 1. The lower surface portion 14 and the side surface portions 16 and 16 are formed to have substantially the same thickness, whereas the upper surface portion 12 is formed to be thicker than these.

  Moreover, the recessed part 18 is formed in the outer surface 12a side of the upper surface part 12 as a part recessed rather than the outer surface 12a which is a horizontal surface. The recess 18 is formed with an air hole 20 that communicates with the hollow portion 10 described above.

  Further, tapered surfaces 22 and 22 that are inclined toward the inner side of the sealing material 1 are formed on the outer surface of the connection portion between the upper surface portion 12 and the side surface portions 16 and 16. As will be described later, the tapered surfaces 22 and 22 have an appropriate inclination angle and an appropriate angle so that the sealing material 1 can be inserted into the sealing groove 32 whose opening is narrowed by the drop-off preventing convex portions 36 and 36. It is formed in length.

  In addition, arcuate R surfaces 24 and 24 are formed on the outer surface of the connecting portion between the lower surface portion 14 and the side surface portions 16 and 16. The R surfaces 24, 24 are suitable so as to come into contact with the drop-off preventing convex portions 36, 36 formed at the opening side end portions of the side surfaces of the seal groove 32 when the sealing material 1 is mounted in the seal groove 32. It is formed in a simple shape.

  The sealing material 1 having such a cross-sectional shape is formed in an annular shape or a long shape in plan view. A plurality of the air holes 20 described above are formed at predetermined intervals in the longitudinal direction of the sealing material 1.

  Such a sealing material 1 of the present embodiment is formed of a solid rubber material instead of a rubber sponge as in a conventional sealing material. That is, it is made of a so-called general rubber material having a dense internal structure, not a porous rubber having innumerable holes formed therein like a rubber sponge. The specific gravity of a general rubber material is about 0.8 or more while the specific gravity of a rubber sponge is about 0.1 to 0.3, and both are clearly distinguished.

  Examples of such rubber materials include natural rubber, various synthetic rubber materials such as nitrile rubber, hydrogenated nitrile rubber, fluorine rubber, silicone rubber, urethane rubber, ethylene propylene rubber, and rubber with cloth. The sealing material 1 of this embodiment is formed of silicone rubber.

  Such a solid rubber material has a high resilience to elastic deformation as compared with a rubber sponge, and does not cause a large permanent distortion even when compressed over a long period of time. Since the sealing material 1 of the present invention is formed of such a highly resilient rubber material, it is less likely to cause settling compared to the conventional rubber sponge sealing material 100 described above. Further, since such a solid rubber material does not infiltrate salt or rain water unlike a rubber sponge, the contact surface of the seal groove 32 with the seal material 1 does not corrode.

  As shown in FIGS. 1 and 3, the sealing material 1 having such a cross-sectional shape is attached to a sealing groove 32 formed on the outer peripheral edge on the lower surface side of the lid 30. In addition, the lid | cover 30 in this embodiment shall be a lid | cover of the radioactive waste container in which the radioactive waste was accommodated.

  The seal groove 32 is formed in a substantially rectangular cross section, and the width of the seal groove 32 is substantially the same as the width of the seal material 1. Further, the height of the sealing groove 32 is substantially the same as the height of the sealing material 1.

  Further, as shown in FIG. 3, drop-off preventing convex portions 36 are formed on the opening side end portions of the left and right side surfaces of the seal groove 32. By forming such drop-off prevention convex portions 36, 36, the opening width of the seal groove 32 is narrower than the seal width of the sealing material 1. In the present embodiment, the drop-off preventing protrusions 36 and 36 are made of a member different from the lid 30, and for example, a metal wire such as stainless steel is fixed to the seal groove 32 of the lid 30 by welding. It is formed with.

  In the present embodiment, as described above, the drop-off preventing convex portions 36, 36 are formed by fixing the wire member which is a separate member to the seal groove 32, but the present invention is not limited to this, for example, The opening-side end portion on the side surface of the seal groove 32 may be processed and deformed to form the drop-off preventing convex portions 36 and 36. However, rather than forming the drop-off prevention convex portions 36 and 36 by processing and deforming the seal groove 32 itself, it is more preferable to fix the separate member such as a wire to the seal groove 32 to form the drop-off prevention convex portions 36 and 36. This is preferable because the drop-off preventing convex portions 36 can be easily formed in the seal groove 32.

  Moreover, as shown in FIG. 3, the drop-off preventing convex portions 36, 36 of the present embodiment are formed in a circular shape in a sectional view, but the present invention is not limited to this. If the sealing material 1 has a shape that does not damage the sealing material 1 when the sealing material 1 is inserted into the sealing groove 32, for example, a semicircular shape, an elliptical shape, or a rectangular shape with chamfered corners. It doesn't matter.

  As shown in FIG. 3, an exhaust hole 35 penetrating the bottom surface of the seal groove 32 is formed on the bottom surface of the seal groove 32 at a position facing the concave portion 18 of the seal material 1. A plurality of the exhaust holes 35 are formed at predetermined intervals in the longitudinal direction of the seal groove 32.

  The sealing material 1 of the present invention is fitted into the seal groove 32 with the upper surface portion 12 as a head so that the outer surface 12 a of the upper surface portion 12 contacts the bottom surface of the seal groove 32. At this time, since the tapered surfaces 22 and 22 are formed between the upper surface portion 12 and the side surface portions 16 and 16 of the sealing material 1, even if the opening portion is narrowed by the drop-off preventing convex portions 36 and 36, The upper surface portion 12 can be inserted into the seal groove 32. Moreover, since the side surface parts 16 and 16 of the sealing material 1 are easy to deform | transform to the inner surface side in which the hollow part 10 is formed, even if the opening part is narrowed by drop-off prevention convex parts 36 and 36, the side surface parts 16 and By deforming 16 to the inner surface side, the sealing material 1 can be easily inserted into the seal groove 32.

  As shown in FIG. 3, the sealing material 1 inserted into the sealing groove 32 in this way is in a state in which the R surfaces 24, 24 and the drop-off preventing convex portions 36, 36 are in contact with each other. 32. Therefore, even if the sealing material 1 is not fixed to the sealing groove 32 with an adhesive or the like, the sealing material 1 does not fall out of the sealing groove 32.

  Then, when the container body is closed by the lid 30 in the state where the seal material 1 is mounted in the seal groove 32, the tip end portion 40a of the side wall 40 is inserted into the seal groove 32 as shown in FIG. The portion 40 a presses the outer surface 14 a of the lower surface portion 14. And the space | interval between the lid | cover 30 and a container main body is sealed because the pressed sealing material 1 compresses and deforms.

  At this time, as described above, the sealing material 1 is formed with the air hole 20 communicating with the hollow portion 10, and when the sealing material 1 is compressed and deformed, the air in the hollow portion 10 is sealed through the air hole 20. The material 1 is discharged to the outside. For this reason, the sealing material 1 of this invention is equipped with the high compressibility which deform | transforms large with a small pressing force, and has the high compressibility equivalent to or more than the conventional rubber sponge sealing material.

  Further, as described above, the exhaust hole 35 penetrating the bottom surface of the seal groove 32 is formed, and when the seal material 1 is compressed and deformed, the air in the hollow portion 10 discharged to the concave portion 18 of the seal material 1 is discharged. The gas is discharged to the outside of the seal groove 32 through the exhaust hole 35. Thereby, in the sealing material 1 of this invention, the high compressibility which deform | transforms greatly with a smaller pressing force can be exhibited.

  Moreover, in the sealing material 1 of this embodiment, surface treatment can also be given to the outer surface 14a of the lower surface part 14. FIG. The surface treatment is performed in order to reduce the coefficient of friction of the outer surface 14a and prevent the contacting member from adhering to the outer surface 14a. Examples of such surface treatment include fluorine resin and silicone resin. For example, various surface treatment agents for rubber made of urethane resin, coating of PTFE sheet or the like, or chemical treatment such as halogen treatment can be used.

  If such a surface treatment is applied to the outer surface 14a of the lower surface portion 14, even if the distal end portion 40a presses the outer surface 14a for a long period of time, the outer surface 14a and the distal end portion 40a are hardly fixed. Therefore, when the outer surface 14a and the front end portion 40a are fixed, the sealing material 1 may be damaged when the sealing material 1 is detached from the sealing groove 32 or the fixing portion is forcibly removed when the lid 30 is removed. By applying a surface treatment to the outer surface 14a, such a problem can be prevented in advance.

  As described above, the sealing material 1 of the present invention has a high compressibility equivalent to or higher than that of a conventional rubber sponge sealing material, is less prone to settling, and has a longer life than the conventional sealing material. It is material 1.

In addition, the sealing material 1 of the present invention can be fixed and attached to the sealing groove without using an adhesive, and thus can be easily replaced.
In the above-described embodiment, the exhaust hole 35 penetrating the bottom surface of the seal groove 32 is formed, and the air in the hollow portion 10 is discharged into the container through the exhaust hole 35. However, the present invention is not limited to this. For example, as shown in FIG. 5, instead of the exhaust hole 35, the left side of the seal groove 32 extends from the bottom surface of the seal groove 32 at a position facing the recess 18 of the seal material 1. An exhaust groove 34 that is a groove continuously formed up to the opening side end of the surface may be formed. Although not shown, such an exhaust groove 34 may be formed on the right side surface of the seal groove 32, and for example, such an exhaust groove 34 may be formed on both side surfaces of the seal groove 32. Is.

  However, it is preferable that the exhaust hole 35 and the exhaust groove 34 described above are formed so that the exhaust port is located inside the container as in the above-described embodiment. Thus, if the discharge port is formed so as to be located inside the container, it is possible to prevent salt or rainwater from entering the seal groove 32 from the outside of the container.

In the embodiment described above, the lower surface portion 14 of the sealing material 1 is formed horizontally, and the height of the sealing material 1 is formed to be the same as the height of the seal groove 32. However, the sealing material 1 of this invention is not limited to this, For example, it is set as the sealing material 1 as shown in FIGS. 6-8, or it is set as the sealing material 1 as shown in FIGS. 9-11. It is also possible.
<Second Embodiment>
FIG. 6 is a cross-sectional view showing a sealing material according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view showing a state in which the sealing material according to the second embodiment of the present invention is mounted in the seal groove. FIG. 8 is a cross-sectional view showing a state where the sealing material of the second embodiment of the present invention seals between the lid and the container body. Note that the sealing material 1 of the second embodiment has basically the same configuration as the sealing material 1 of the above-described embodiment, and the same members are denoted by the same reference numerals, and the details thereof are the same. Description is omitted.

  In the sealing material 1 of the second embodiment, as shown in FIG. 6, the above-described implementation is that the lower surface portion 14 of the sealing material 1 is formed in a curved shape so as to bulge toward the outer surface 14a. It is different from the form. As shown in FIG. 7, a part of the distal end side of the outer surface 14 a of the curved lower surface portion 14 is attached to the seal groove 32 so as to protrude from the seal groove 32.

  The sealing material 1 according to the second embodiment thus configured has basically the same functions and effects as those of the above-described embodiment, and the lower surface portion 14 is horizontally formed by the amount of the volume of the hollow portion 10 being large. It has higher compressibility than the sealing material 1 of the above-described embodiment.

<Third Embodiment>
FIG. 9 is a cross-sectional view showing a sealing material according to a third embodiment of the present invention. FIG. 10 is a cross-sectional view showing a state in which the sealing material of the third embodiment of the present invention is mounted in the seal groove. FIG. 11 is a cross-sectional view showing a state where the sealing material of the third embodiment of the present invention seals between the lid and the container body. The sealing material 1 according to the third embodiment has basically the same configuration as the sealing material 1 according to the above-described embodiment, and the same members are denoted by the same reference numerals, and detailed description thereof is provided. Is omitted.

  In the sealing material 1 of the third embodiment, as shown in FIGS. 9 and 10, the outer surface 14a of the lower surface portion 14 of the sealing material 1 is formed in a curved shape so as to be recessed toward the inner surface 14b. This is different from the embodiment described above.

  In this way, if the outer surface 14a of the lower surface portion 14 is formed in a curved shape that is recessed toward the hollow portion 10, as shown in FIG. 11, when the distal end portion 40a presses the outer surface 14a, this curved shape is formed. The tip 40a comes into contact with the recessed portion. Therefore, the contact position between the outer surface 14a and the distal end portion 40a is difficult to shift.

  Further, when the container main body is closed with the lid 30, even if the tip 40a comes into contact with the outer surface 14a in a slightly displaced state, the outer surface 14a is formed in a curved shape, so that the displacement of the contact position is not caused. It is automatically corrected. At this time, as described above, if the surface treatment is applied to the outer surface 14a, the frictional resistance between the outer surface 14a and the outer surface 14a is reduced. The displacement of the contact position between the outer surface 14a and the tip 40a can be corrected more reliably.

<Fourth Embodiment>
FIG. 12 is a cross-sectional view showing a sealing material according to a fourth embodiment of the present invention. FIG. 13 is a cross-sectional view showing a state where the seal material of the fourth embodiment of the present invention is mounted in the seal groove. FIG. 14 is a cross-sectional view showing a state in which the sealing material according to the fourth embodiment of the present invention seals between the lid and the container body. FIG. 15 is a cross-sectional view showing a state in which the sealing material according to the fourth embodiment of the present invention is deformed asymmetrically. Note that the sealing material 1 of the fourth embodiment has basically the same configuration as the sealing material 1 of the above-described embodiment, and the same members are denoted by the same reference numerals, and detailed description thereof. Is omitted.

  In the sealing material 1 of the fourth embodiment, as shown in FIGS. 12 and 13, unlike the above-described embodiment, the outer surface 14a of the lower surface portion 14 is formed horizontally, but the inner surface 14b is hollow. The lower surface portion 14 is formed in a convex shape on the hollow portion 10 side. And the lower surface part 14 is formed so that thickness may become thin from a center part to an edge part.

  Thus, if the lower surface part 14 of the sealing material 1 is formed in a mountain shape whose thickness is reduced from the central part to the end part, a large reaction force can be obtained at the central part where the thickness is thick. In addition, the end portion having a small thickness is easily deformed. Therefore, as shown in FIG. 14, when the tip end portion 40a presses the outer surface 14a, a large reaction force can be obtained from the sealing material 1, and thus high sealing performance is provided. Moreover, since the whole lower surface part 14 deform | transforms large in the hollow part 10 side, it has high compressibility.

  Further, for example, as shown in FIG. 15, even when the abutting position of the distal end portion 40 a is shifted to the left and right and the sealing material 1 is deformed asymmetrically, the lower surface portion 14 is deformed to act on the sealing material 1. Since the pressing force to be absorbed is absorbed, an excessive axial force does not act on one of the side surfaces 16 and 16, and buckling or the like does not occur on the side surfaces 16 and 16.

  In addition, such a function effect should just be formed in the mountain shape from which the lower surface part 14 of the sealing material 1 becomes thin from the center part to an edge part, for example, the lower surface part 14 of the sealing material 1 is the outer surface 14a side. Even if it is formed in a convex shape, it is achieved. However, as in the above-described embodiment, when the lower surface portion 14 of the sealing material 1 is formed in a mountain shape protruding on the hollow portion 10 side, such an effect is more prominent.

  Further, in the sealing material 1 of the fourth embodiment, unlike the above-described embodiments, the side surface portions 16 of the sealing material 1 are thicker from the lower surface portion 14 to the upper surface portion 12 of the sealing material 1. In addition, the lower surface portion 14 of the sealing material 1 is formed wider than the width of the sealing groove 32. Further, the outer surfaces 16 a and 16 a of the side surface portions 16 and 16 of the sealing material 1 are tapered inward from the lower surface portion 14 toward the upper surface portion 12.

  As described above, the sealing material 1 of the present embodiment has the lower surface portion 14 formed wider than the width of the seal groove 32, so that the drop-off preventing convex portions 36 and 36 are temporarily formed at the opening end portion of the seal groove 32. Even if not, the sealing material 1 attached to the seal groove 32 is difficult to drop off from the seal groove 32. Even in this case, since the lower surface portion 14 is configured to be easily deformed, the sealing material 1 can be easily mounted in the seal groove 32 by compressing the lower surface portion 14 in the width direction. Further, since the outer surfaces 16a and 16a of the side surface portions 16 and 16 are tapered inward from the lower surface portion 14 to the upper surface portion 12, the sealing material 1 can be easily mounted in the seal groove 32. .

  Needless to say, the one where the drop preventing projections 36 are formed at the opening end of the seal groove 32 more reliably prevents the seal material 1 attached to the seal groove 32 from dropping from the seal groove 32. This is preferable.

  Moreover, in the sealing material 1 of this 4th Embodiment, the R surface 24 is formed in the outer surface of the connection part of the lower surface part 14 and the side surface part 16 of the sealing material 1 similarly to embodiment mentioned above, and the lower surface part In accordance with the deformation of 14, the side surface portions 16, 16 are easily deformed.

  Therefore, even when the sealing material 1 is deformed asymmetrically in the left-right direction, the side surface portions 16 and 16 are also gradually deformed as the lower surface portion 14 is deformed, and an excessive axial force acts on the side surface portions 16 and 16. This prevents buckling and the like from occurring.

In addition to the R surface 24 described above, the shape of the connecting portion between the lower surface portion 14 and the side surface portions 16, 16 may be a tapered surface 24 'as shown in FIG.
As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to the said embodiment. Various modifications can be made without departing from the object of the present invention.

  For example, in the embodiment described above, only one air hole 20 is formed on the same cross section, but the sealing material 1 of the present invention is not limited to this, and a plurality of air holes 20 are formed on the same cross section. Of course it is possible.

  Moreover, although embodiment mentioned above demonstrated the case where the sealing material 1 of this invention was mounted | worn with the seal groove 32 currently formed in the lid | cover 30 of a container, the sealing material 1 of this invention is limited to this. For example, the sealing groove | channel 32 may be formed in the container main body.

  Further, as described above, the sealing material 1 of the present invention can be suitably used as a sealing material for a radioactive waste container in which radioactive waste is accommodated, but the present invention is not limited to this. Absent. That is, as in the above-described embodiment, the sealing material 1 of the present invention can be used as long as the sealing material is a container or machine that requires high compressibility and compressibility.

DESCRIPTION OF SYMBOLS 1 Sealing material 10 Hollow part 12 Upper surface part 14 Lower surface part 16 Side surface part 18 Recessed part 20 Air hole 22 Tapered surface 24 R surface 24 'Tapered surface 30 Lid 32 Seal groove 34 Exhaust groove 35 Exhaust hole 36 Drop prevention convex part 40 Side wall 40a Tip Part 100 Sealing material 130 Lid 132 Sealing groove 140 Side wall 140a Tip part

Claims (18)

A seal material that seals between the first member and the second member by being attached to the seal groove formed in the first member and being pressed by the second member inserted into the seal groove. There,
The sealing material is formed in a hollow cross-section, and a recess is formed on the outer surface side of the upper surface portion of the sealing material that is oriented toward the bottom surface side of the seal groove, and the hollow portion of the sealing material is formed in the recess. A sealing material characterized in that air holes communicating therewith are formed.   The sealing material according to claim 1, wherein the sealing material is formed of a dense rubber material.   The sealing material according to claim 1 or 2, wherein a drop-off preventing convex portion for narrowing an opening width of the seal groove is formed at an opening side end portion of the side surface of the seal groove.   The sealing material according to claim 3, wherein the drop-off preventing convex portion is formed by fixing another member to the seal groove.   The sealing material according to any one of claims 1 to 4, wherein a plurality of the air holes are formed at intervals with respect to the length direction of the sealing material.   The exhaust hole which penetrates the said 1st member is formed in the bottom face of the said seal groove in the position facing the recessed part currently formed in the upper surface part of the said sealing material, The Claim 1 to 5 characterized by the above-mentioned. The sealing material in any one of.   In the seal groove, an exhaust groove that is continuous from the bottom surface of the seal groove at a position facing the concave portion formed in the upper surface portion of the seal material to the opening side end portion of the side surface of the seal groove is formed. The sealing material according to claim 1, wherein:   The sealing material according to claim 6 or 7, wherein a plurality of the exhaust grooves or the exhaust holes are formed at intervals with respect to the length direction of the seal grooves.   The surface treatment for preventing that the said 2nd member adheres is given to the outer surface of the lower surface part of the said sealing material which a said 2nd member contacts, The any one of Claim 1 to 8 characterized by the above-mentioned. Seal material according to crab.   10. The sealing material according to claim 1, wherein a lower surface portion of the sealing material is formed in a curved shape bulging outward.   The sealing material according to any one of claims 1 to 9, wherein an outer surface of a lower surface portion of the sealing material is formed in a curved shape recessed toward an inner surface side.   The sealing material according to any one of claims 1 to 9, wherein the lower surface portion of the sealing material is formed in a mountain shape whose thickness decreases from a center portion to an end portion.   13. The sealing material according to claim 12, wherein the lower surface portion of the sealing material has a mountain shape that is convexly formed on the hollow portion side.   14. The sealing material according to claim 12, wherein a side surface portion of the sealing material is formed so as to increase in thickness from a lower surface portion to an upper surface portion of the sealing material.   The sealing material according to claim 14, wherein an outer surface of a connection portion between the lower surface portion and the side surface portion of the sealing material is formed as an R surface or a tapered surface.   The sealing material according to claim 14 or 15, wherein a lower surface portion of the sealing material is formed wider than a width of the sealing groove.   The sealing material according to claim 16, wherein an outer surface of the side surface portion of the sealing material has an inward taper from a lower surface portion to an upper surface portion of the sealing material.   The sealing material according to any one of claims 1 to 17, wherein the sealing material is used in a radioactive waste container in which radioactive waste is accommodated.

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