JPS6324294Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a garter spring for segment seals, and an object of the present invention is to improve a garter spring that fits around the outer periphery of segment seals of various shapes and is tightened and assembled.

A segment seal conventionally used in a stern tube shaft sealing device, etc. is installed in an annular recess of a housing, etc., and is pressed against the shaft by a garter spring fitted around the outer periphery of each member divided in the circumferential direction. Although the garter spring forms a seal portion that slides in contact with the shaft, if the garter spring is damaged due to corrosion or the like, there is a risk that each divided piece will fly into the housing and damage other components.

The present invention was made in view of the above problem, and is divided into circumferential directions, and has a sealing mechanism in the divided portion,
In a garter spring installed on the outer diameter surface of a segment seal, the inner diameter surface and the axial end surface are sealing surfaces that contact other members, and the back surface of each seal surface is equipped with a spring. It is an object of the present invention to provide a garter spring formed by inserting a wire made of flexible material.

Hereinafter, one embodiment of the garter spring of the present invention will be described in terms of a two-ring type segment seal. Fig. 1 is a partially exploded perspective view of the segment seal, and Fig. 2 is a sectional view of the main part thereof. Reference numeral 1 denotes an arc-shaped seal ring formed by dividing an annular body into three equal parts, and each seal ring 1 forms a continuous annular body by an adjacent end of the seal ring 1 and steps 2, 2 extending in the circumferential direction. The step 2
A predetermined dividing gap 3 is formed in the circumferential direction between the end portion and the stepped portion of the adjacent step 2. A shaft seal dam 4 is provided on the inner periphery of the seal ring 1 and slides closely on the outer periphery of the shaft a, and on one side there is a housing seal dam 5 that slides closely on one side wall of the annular recess c of the housing b. An arcuate fitting recess 6 is formed on the outer periphery of the end of the seal rings 1, 1 including the step 2, and an arcuate fitting recess 6 is fitted into the fitting recess 6. A cover ring 7 is attached. Circumferential grooves 8 are provided on the outer peripheries of the seal ring 1 and the cover ring 7, respectively.
9 and a garter spring 10 made of a ring-shaped coiled spring having an appropriate elastic force in the diametrical direction with respect to the circumferential grooves 8 and 9 is attached and externally mounted, and the coiled inside of the garter spring 10 is coated with nylon. A wire made of a flexible material such as wire 11 is inserted in a circular shape. Reference numeral 12 denotes a balance notch formed on the outer periphery of the seal ring 1, and as shown in FIG.
4, the long hole 15 drilled in the seal ring 1 is inserted outwardly to prevent rotation, and the seal ring 1
A coil spring 17 is elastically mounted between a concave hole 16 bored in the back surface of the housing shield dam 4 and the side wall of the annular concave portion c of the housing b to bring the housing shield dam 5 into close contact with the side wall of the annular concave portion c.

Therefore, the segment seal having the above structure is caused by the elasticity of the garter spring 10.
is pressed in the inner radial direction to cause the shaft seal dam 4 to closely slide on the outer periphery of the shaft a, and at the same time, the elasticity of the coil spring 17 seals the housing seal dam 5 closely to the housing b. Even if the garter spring 10 is damaged, since the nylon wire 11 is inserted into the coil of the garter spring 10, the garter spring 10 will not be scattered, and the seal ring 1 and cover ring 7
There is no scattering.

As described above, according to the present invention, a wire made of a flexible material such as nylon wire is inserted through the coiled garter spring that fits around the outer periphery of the segment seal, thereby preventing secondary accidents when the garter spring breaks. Not only does this prevent fatal damage, but the seal ring and cover ring are held in an annular shape by the tension of the flexible wire, and the sealing effect can be maintained to a certain extent. However, the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially exploded perspective view showing a two-ring type segment seal, and FIG. 2 is a front sectional view of the main part showing the same in an attached state. 1... Seal ring, 7... Cover ring,
8, 9... Circumferential groove, 10... Garter spring, 1
1...Nylon wire, 14...Knot pin,
17... Coil spring, a... Shaft, b
……housing.

Claims (1)

[Claims for Utility Model Registration] (1) A product that is divided in the circumferential direction, has a sealing mechanism in the divided portion, and has a sealing surface that comes into sliding contact with other members on the inner diameter surface and the end surface in the axial direction, and each sealing surface is A segment seal comprising a spring that presses against the segment seal, characterized in that a wire made of a flexible material is inserted into the coil of a garter spring in the form of a coil spring that fits around the outer diameter surface of the segment seal. Garter spring for seals. (2) The garter spring for a segment seal according to claim 1, wherein the wire made of flexible material is a nylon wire.