JPH11351397A - Seal packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the sealing even in the case where a diameter shrunk amount is large and thickness of a wiring passing through a casing is changed at some degree by providing a groove in the outer peripheral side of a thick wall part, and providing an annular projection in the inner peripheral side of the thick wall part in an axial position corresponding to the position of the groove. SOLUTION: A V-shaped groove 14 is provided in a thick wall part 13 on the outer peripheral side of a central part thereof, and an annular projection 16 is projected from the inner surface of a through hole 11 in an axial position corresponding to the position provided with the V-shaped groove 14. A conical part 12 of a seal rubber 10 is inserted into a nipple fixed to a casing, and when a cap nut is screwed from the projecting curved surface 15 side for fastening, the conical part 12 is pressed into the nipple, and the projecting curved surface 15 is evenly pushed over the circumference thereof by the cap nut, and compressed in the axial direction. At this stage, the seal rubber 10 is deformed in the direction for making each peripheral edge of the V-shaped groove 14 come close to each other for adhesion, and shrinks the diameter of the annular projection 16, and the periphery of the wiring inserted through the insertion part 11 of the seal rubber 10 is compressed over the whole circumference by the annular projection 16 for tight sealing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal packing for sealing an annular gap with a wiring, a pipe or the like penetrating a watertight or airtight housing in an electric equipment, a mechanical device, and the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a wiring penetrating portion such as a terminal box for wiring or the like has a wiring penetrating portion 1a through which a wiring 2 penetrates a plate 1 of a sealed housing. 1
a, and the nipple 3 fixed to the
And a seal rubber 5 which is a rubber seal packing interposed between the cap nut 4 and the nipple 3 to reduce the diameter in the radial direction and seal a gap between the wire 2 and the cap nut 4. Is attached so as to close the gap with the wiring 2 that passes through.

As the wiring 2, a shielded cable or the like whose surface is covered with rubber, vinyl chloride or the like is used. The nipple 3 has a hexagonal head 3a formed on the outer peripheral side of a central part in the axial direction, male screws 3b and 3c are engraved on the outer peripheral sides of both ends thereof, and a hole 3d for inserting a wiring in the axial direction is formed in the central part. A conical portion 3e is provided at one end of the conical portion 3e, the diameter of which decreases from the vicinity of the peripheral edge of the end surface toward the central portion in the axial direction to the diameter of the hole 3d.

[0004] The cap nut 4 has a hexagonal head 4a formed on the outer peripheral side, a female screw 4b screwed into the male screw 3c of the nipple 3 is engraved on the inner peripheral side, and is formed at the end opposite to the screwed end. Drills a wiring through hole 4c through which the wiring 2 penetrates.
A smooth concave curved surface 4d from the inner diameter of the wiring through hole 4c to the inner diameter of the female screw 4b is formed on the inner surface of the end where the hole is formed, and the diameter is increased.

The seal rubber 5 is made of a material having high elasticity, such as natural rubber or synthetic rubber, and has a conical shape 5a having an inclination angle substantially equal to that of the conical portion 3e of the nipple 3 at one end of the outer peripheral portion. On the other end side, a convex curved surface shape 5b that contacts the concave curved surface 4d of the cap nut 4 is formed, and a hole 5c through which the wiring 2 passes is formed at the center. The diameter of the hole 5c is substantially the same as the diameter of the required wiring 2. For example, of the diameter 9 to 14 mm of the wiring 2, the diameter is 9,10,11,12,13,14 m.
If it is necessary to use wiring 2 of m
The seal rubber 5 having six kinds of hole diameters corresponding to the wiring 2 of 11, 12, 13, and 14 mm is prepared.

In order to seal the wiring 2 penetrating through the wiring penetrating portion 1a, a wiring through hole 4c of a cap nut 4 having a female screw 4b opposed to a male screw 3c of the nipple 3, and a nipple 3
Rubber 5 with the conical shape 5a side facing the conical portion 3e
The female screw 4b of the cap nut 4 is screwed into the male screw 3c of the nipple 3 with the wiring 2 passed through the hole 5c of the nipple 3 and the hole 3d of the nipple 3 in order. The conical shape 5a of the seal rubber 5 is press-fitted into 3e, and the convex curved surface shape 5b of the seal rubber 5 is pressed by the concave curved surface 4d of the cap nut 4 and compressed in the axial direction, and the outer peripheral side is formed by the nipple 3 and the cap nut 4. Is deformed in the direction of reducing the diameter of the hole 5c, and presses the outer periphery of the wiring 2 over the entire periphery, adheres tightly, and seals by closing the annularly formed gap.

[Problem] In such a conventional method for sealing the wiring 2 penetrating the wiring penetrating portion 1a using the seal rubber 5, the cap nut 4 is screwed into the nipple 3 and the hole of the seal rubber 5 is formed. When the outer diameter of the wiring 2 is sealed by reducing the diameter of the wire 5c, the seal rubber 5 having the size of the hole 5c having substantially the same diameter as the diameter of the wiring 2 needs to be used because the diameter of the seal rubber 5 is small. was there.

For this reason, for the wirings 2 having different thicknesses, it is necessary to use the sealing rubbers 5 having matching hole diameters, and the sealing rubbers 5 matching the thickness of the wirings 2 must be provided. However, many types of seal rubbers 5 are required, and the number of types to be manufactured increases, so that a problem that the unit price of the seal rubbers 5 increases has arisen.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems in the prior art. To solve this problem, a specific problem to be solved is that the amount of diameter reduction is large and the wiring thickness is large. An object of the present invention is to provide a seal packing that can be used even when the seal packing changes to some extent.

[0010]

Means for Solving the Problems Claim 1 of the present invention
The seal packing according to the present invention has a through hole drilled in the axial direction at the center, a tapered portion that is tapered toward the distal end at one end, and an outer peripheral surface and an end surface at the other end. In the seal packing having a convex curved surface that connects the spaces smoothly, a groove is provided on the outer peripheral side of the thick part and an annular protrusion is provided on the inner surface side of the thick part at an axial position corresponding to the position where the groove is provided. It is characterized by being provided around.

Further, the seal packing according to claim 2 is
The groove has a depth of at least half the thickness of the thick portion.
It is a groove.

Further, the seal packing according to claim 3 is
The annular projection has an inner peripheral surface formed on a substantially annular inner peripheral surface.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be specifically described below in the case of a sealing rubber for sealing a power distribution cable. However, the same reference numerals are given to the same parts as in the prior art, and the description is omitted. This embodiment is specifically described for better understanding of the gist of the invention, and does not limit the content of the invention unless otherwise specified.

FIG. 1 shows a seal rubber according to an embodiment. As shown in FIG. 1, the seal rubber 10 has a conical shape in which a through hole 11 having an inner diameter of 14 mm is formed in the axial direction, and the outer shape from one end to the center is reduced in diameter toward the tip. A cylindrical thick portion 13 having an outer diameter from the center to the other end excluding the conical portion 12 and into the portion where the female screw 4b on the nut 4 side is formed. The central part of the part 13 is 1 to 2 of the thickness of the thick part 13.
V-grooves 14 having a depth reaching / 3 are formed, and a smooth convex curved surface 15 is formed from the end of the thick portion 13 to the end surface on which the conical portion 12 is not formed. At the inner surface side, an annular projection 16 having an inner diameter of 13 mm and a radius of curvature of the inner peripheral section of 0.5 mm or less is provided at an axial position corresponding to the position where the V groove 14 is engraved. Let it.

Using this seal rubber 10, the penetration portion 1
In order to seal the wiring 2 having an outer diameter of 13 mm penetrating through the wire 1, the wiring 2 is inserted into the holes of the components 3, 10 and 4 arranged in a predetermined arrangement, and the sealing rubber is inserted into the conical portion 3 e of the nipple 3. 1
When the female screw 4b of the cap nut 4 is screwed into the male screw 3c of the nipple 3 and tightened, the conical portion 12 of the seal rubber 10 is pressed into the conical portion 3e of the nipple 3. The convex curved surface 15 of the seal rubber 10 is uniformly pressed circumferentially by the concave curved surface 4d of the cap nut 4 and is compressed in the axial direction.

At this time, the seal rubber 10 whose outer peripheral side is suppressed by the nipple 3 and the cap nut 4 is
Are deformed in a direction in which the respective outer peripheral edges are brought close to each other, and the annular projection 16 is reduced in diameter (see FIG. 2), and the outer circumference of the wiring 2 inserted through the through portion 11 of the seal rubber 10 is reduced in diameter. Pressure is applied over the entire circumference by the annular protrusion 16, and the sealing is made by tightly closing the gap between the penetrating portion 11 and the wiring 2.

Even when the wiring 2 seals the wiring 2 having a diameter of 9 mm, the same sealing rubber 10 can be used. In this case, a curved washer 2 as shown in FIG.
Use 1. The washer 21 has an inner curved surface having a curvature radius substantially the same as the convex curved surface 15 of the seal rubber 10, an outer diameter substantially equal to the outer diameter of the seal rubber 10, and an inner diameter slightly smaller than the outer diameter of the wiring 2. The diameter of the washer is set so as not to hinder the insertion of the wiring 2 and not to be too large as the inner diameter of the washer.

In use, the washer 21 is disposed between the seal rubber 10 and the inner surface of the cap nut 4,
Is screwed into the nipple 3 and tightened. The washer 21 pressed by the cap nut 4 presses the convex curved surface 15 of the seal rubber 10 in the axial direction with a uniform pressing force in the circumferential direction.
Is uniformly deformed, and the outer circumference of the wiring 2 is reduced in diameter.
6 and presses tightly over the entire circumference,
Is sealed by closing the gap between the wire and the wiring 2.

As described above, the diameter of the seal rubber 10 is reduced by 1
Since it is possible to reduce the diameter of the wire 2 of 4 to 9 mm to the extent that the wire 2 can be sealed, there is no need to prepare a seal rubber having a different size according to the diameter of the wire 2 as compared with the conventional product. The seal rubber 10 having the same size can be used for a plurality of wires 2 having different diameters. Then, with respect to the wiring dimensions within the usable range, any wiring 2 having any dimensions can pass the leak test of the Fire Service Class 4 class.

[Alternative Embodiment] This embodiment is specifically described for easy understanding, but does not limit the contents of the invention, and does not limit other embodiments. For example, as a seal packing, a material to be used may be made of a plastic or a metal material depending on the application in addition to a synthetic rubber or a natural rubber. Even in the case of the seal rubber 10, the shape of the V groove 14 or the annular projection 16 may be changed to a U groove or an annular annular projection. Further, the number may be plural in the axial direction.

[0021]

As described above, in the seal packing according to the first aspect of the present invention, a groove is provided on the outer peripheral side of the thick part and the thick part is located at an axial position corresponding to the position where the groove is provided. When the annular projection is provided on the inner surface side, when receiving the pressing force in the axial direction, the width of the groove is narrowed and the annular projection is further protruded inward, and the wiring inserted through the through hole of the seal packing is removed. The annular projection presses radially inward from the outer peripheral side to seal. For this reason, the outer peripheral surface of the shaft can be effectively sealed with less pressing force in the axial direction as compared with the conventional seal packing.

In the seal packing according to the second aspect, since the groove is a V-shaped groove having a depth of at least half the thickness of the thick part, the groove width is reduced in a direction in which the groove width is reduced by an axial pressing force. Can be easily generated, and the diameter of the annular projection can be reduced.

Further, in the seal packing according to the third aspect, since the annular projection is formed on the inner peripheral surface of the substantially annular inner peripheral surface, the contact with the wiring is line contact, and the conventional surface contact is used. The sealability can be improved as compared with the seal.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a seal rubber according to an embodiment of the present invention.

FIG. 2 is an explanatory longitudinal sectional view showing a state in which a seal rubber in an embodiment is compressed in an axial direction.

FIG. 3 is an explanatory longitudinal sectional view showing a curved washer in the embodiment.

FIG. 4 is a vertical cross-sectional view showing a state where a wiring penetrating portion is sealed using a conventional seal rubber.

[Explanation of symbols]

 Reference Signs List 1 plate 2 wiring 3 nipple 3a hexagonal head 3b, 3c male screw 3d hole 3e conical part 4 cap nut 4a hexagonal head 4b female screw 4c wiring through hole 4d concave curved surface 10 seal rubber (seal packing) 11 penetrating part 12 conical part 13 thickness Meat part 14 V groove 15 Convex curved surface 16 Annular protrusion

Claims (3)

[Claims] A central portion has a through hole formed in an axial direction, a tapered portion tapering toward the distal end is provided at one end, and a tapered portion is provided at the other end between an outer peripheral surface and an end surface. A groove is formed on the outer peripheral side of the thick part, and an annular projection is formed on the inner surface side of the thick part at the axial position corresponding to the position where the groove is formed. Seal packing characterized by being provided. 2. The seal packing according to claim 1, wherein said groove is a V-shaped groove having a depth of at least half the thickness of said thick portion. 3. The seal packing according to claim 1, wherein said annular projection has an inner peripheral surface formed on a substantially annular inner peripheral surface.