JPH0643470U - Seal packing - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a seal packing that allows bending of a pipe and allows eccentric connection. [Structure] A plurality of annular projections 31 and 32 are provided on an inner peripheral surface and an outer peripheral surface of an elastic body 30 made of rubber or the like at predetermined intervals in the axial direction. [Effect] Pipes can be connected in a watertight manner, and bending and eccentricity of the pipes can be allowed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seal packing used when connecting pipes to each other in a stretchable manner.

[0002]

[Prior art]

 Japanese Utility Model Publication No. 51-157918 and Japanese Utility Model Publication No. 47-30672 disclose a seal in which a plurality of annular projections are provided at a predetermined interval in the axial direction on the inner or outer peripheral surface of an elastic body made of rubber or the like. Packing is proposed.

[0003]

[Problems to be solved by the device]

 However, the conventional seal packing has a problem of watertightness when the pipes are connected to each other in a stretchable manner. That is, when a plurality of annular protrusions are provided only on the inner or outer peripheral surface of the elastic body, sufficient watertightness cannot be ensured because the outer peripheral surface or inner peripheral surface without the annular protrusion is in surface contact. . In addition, if a plurality of annular projections are provided only on one surface of the inner or outer peripheral surface of the elastic body, it is not possible to allow the bending of the pipe at the relevant connection part sufficiently, and the axial cores of both connected pipes are not allowed. There was a problem that sufficient watertightness could not be ensured when there was a deviation and eccentricity.

The present invention has solved the above problems and provides a seal packing that allows bending of a pipe when the pipes are connected to each other in an expandable and contractible manner and also allows eccentric connection. is there.

[0005]

[Means for Solving the Problems]

 The present invention is characterized in that a plurality of annular projections are provided at predetermined intervals in the axial direction on the inner peripheral surface and the outer peripheral surface of an elastic body made of rubber or the like.

[0006]

Since a plurality of annular projections are provided on the inner peripheral surface and the outer peripheral surface of the elastic body at predetermined intervals in the axial direction, the seal packing is provided on the inner peripheral surface of the receiving pipe and the outer peripheral surface of the inlet pipe. When intervening between the two, the tips of the annular projections are pressed against both surfaces to ensure watertightness. Further, bending of the pipe and eccentric connection at the connecting portion are allowed by elastic deformation of annular protrusions provided on the inner and outer peripheral surfaces of the elastic body.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial cross-sectional view showing a state where pipes are connected by using a seal packing of the present invention, and FIG. 2 is a partial cross-sectional view showing a state where pipes are connected by using a seal packing of another embodiment of the present invention. In the figure, 1 is a receiving pipe, 2 is an inlet pipe, and 3a and 3b are seal packings made of rubber or the like.

The seal packing 3a shown in FIG. 1 is provided with a plurality of linear protrusions 31 having a rectangular cross section on the inner peripheral surface and the outer peripheral surface of a cylindrical elastic body 30 at opposite positions. The respective annular protrusions 31 are provided at predetermined intervals in the axial direction. When the seal packing 3a is attached to the inner peripheral surface of the expanded diameter end portion 11 of the receiving tube 1 and the spout tube 2 is extensiblely connected, each annular protrusion provided on the inner peripheral surface and the outer peripheral surface of the elastic body 30. The watertightness is secured by the tips of 31 being pressed against the inner and outer peripheral surfaces of the two pipes. In the case of this embodiment, the annular protrusion 31 on the inner peripheral surface and the annular protrusion 31 on the outer peripheral surface may be provided at different positions, and each annular protrusion 31 may be inclined in the axial direction. Furthermore, the tips of the respective annular protrusions 31 may be formed in a lip shape so that the intervals between the respective annular protrusions 31 are different between the end portion and the central portion.

The seal packing 3b shown in FIG. 2 is formed by bending a cylindrical elastic body 30 into a bellows shape and providing a plurality of annular protrusions 32 on the inner and outer peripheral surfaces thereof. The seal packing 3b is mounted in an annular groove 12 provided on the inner surface of the end portion of the receiving pipe 1, and the spout pipe 2 is telescopically connected. 1 and 2, the annular projections 31 and 32 provided on the inner and outer peripheral surfaces of the elastic body 30 are elastically deformed, so that the connection pipe and the inlet pipe 1 are connected at the connection portion. Bending of the axial center of the pipe 2 is allowed, and even if the axial centers of both pipes are displaced and eccentric, the fluid in the pipe does not leak.

[0010]

[Effect of device]

 As described above in detail, according to the present invention, not only the annular projections provided on the inner and outer peripheral surfaces of the elastic body at a predetermined interval are brought into pressure contact with the inner and outer peripheral surfaces of the pipe to obtain sufficient watertightness. Since the tube can be bent due to the elastic deformation of the annular protrusion and eccentric connection can be made, the tube connection work can be performed easily.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing a state in which pipes are connected to each other using the seal packing of the present invention.

FIG. 2 is a partial sectional view showing a state in which pipes are connected to each other by using a seal packing according to another embodiment of the present invention.

[Explanation of symbols]

 1 Receiving pipe 2 Outlet pipe 3a Seal packing 3b Seal packing

Claims (1)

[Scope of utility model registration request] 1. A seal packing characterized in that a plurality of annular projections are provided on an inner peripheral surface and an outer peripheral surface of an elastic body made of rubber or the like at predetermined intervals in the axial direction.