JPH0227715Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a split seal device used for preventing leakage of fluid in equipment having a rotating shaft portion.

[Prior art and its problems]

Conventionally, in this type of split seal device,
As illustrated in FIGS. 2 and 3, the seal ring 1 and the cover ring 2, which are separated with a gap a in the circumferential direction, are assembled and fitted in the radial direction with a key 3 interposed therebetween, An extension spring 4 is wound around the outer periphery of the cover ring 2 with a predetermined tension so that it can be elastically contracted in the circumferential direction, and both rings 1 and 2 are wrapped around the inner periphery of the housing 5. The seal unit 9 is fitted and held on one side by a snap spring 8 via a compression spring 6 and a spring retainer 7 to form a unit, while this seal unit 9 is fixed to a device main body 11 with a bolt 10, and the device main body is It is well known to have a configuration in which a rotating shaft 12 protruding from the device body 11 is surrounded by a runner 13 around the periphery of the rotating shaft 12 to prevent fluid F in the device body 11 from leaking into the outside air.

However, in the case of such a conventional device, each divided portion of the seal ring 1 and the cover ring 2, or the device body 1 of both rings 1 and 2
Since gaps are likely to be formed on both sides of the secondary seal corresponding to the abutment surfaces between the side surfaces 1a and 2a of the first side and the inner wall surface 5a of the housing 5, leakage from this gap is high, and leakage from this part is high. In order to lower the
If the inner space is designed to be the same, the radial size of the seal ring 1 will be restricted, making it impossible to increase the rigidity of the seal ring 1, and furthermore, the number of assembly parts will be large, making it difficult to assemble. The work was troublesome and costly, and various parts were difficult to handle.

[Purpose of invention]

The present invention was developed under the above circumstances, and aims to reduce the number of parts by reducing the machining accuracy of assembled parts, increase the rigidity of the seal ring, and further reduce leakage. The object of the present invention is to provide a split type sealing device.

[Means for solving problems]

In order to achieve the above purpose, the present invention:
In a split type sealing device in which a cover ring is fitted around the outer periphery of an inner seal ring that is installed in the inner circumferential space of the housing and is divided with a gap in the circumferential direction, the cover ring is continuous in the circumferential direction. The cover ring is made of an elastic material such as rubber, and the cover ring has a flange portion that connects with the housing and the seal ring.

[Effect]

That is, in the present invention, instead of the conventional cover ring divided in the circumferential direction, a cover ring made of an elastic material such as rubber and continuous in the circumferential direction is fitted on the outer circumference of the seal ring. The ring itself has a tension force on the seal ring, and the cover ring also has the function of holding the seal ring in the housing by means of the flange portion. The elastic material adheres closely to the outer circumferential surface of the seal ring and closes the gap between the divided parts, thereby reducing leakage from the gap between the divided parts of the seal ring and creating a secondary seal between the seal ring and the housing. Since the elastic material is in contact with the surface side, leakage at the secondary sealing surface can also be reduced, and thereby the processing accuracy of the seal ring can be made relatively rough. Furthermore, by using an elastic material as the cover ring, the thickness of the elastic material can be made thinner, so the radial dimension of the seal ring can be increased accordingly, making it possible to increase the rigidity of the seal ring. become.

[Example of idea]

The present invention will be explained below with reference to an embodiment shown in FIG.

As shown in FIG. 1, the reference numeral 20 in the figure is a seal unit according to the present invention, in which a seal ring 22 that is divided into parts with gaps (not shown) in the circumferential direction is fitted into the inner peripheral part of the housing 21. An elastic ring 23 made of a highly elastic material such as rubber and serving as a cover ring is fitted to the outer periphery of the seal ring 22. The elastic ring 23 itself has a tensile force against the seal ring 22, and flange portions 23b and 23c that fit into the housing 21 and the seal ring 22 are integrally formed.

Therefore, according to the above configuration, since the elastic ring 23 is provided around the outer periphery of the seal ring 22, the gap between the divided portions of the seal ring 22 is sealed by elastic deformation of the elastic ring 23. Furthermore, the contact between the inner wall surface 21a of the housing 21 and the inner surface 23a of the elastic ring 23 increases the sealing effect of the secondary sealing surface, making it possible to reduce leakage and making it possible to The processing of 22 does not require precision, and the thickness of the elastic ring 23 can be made thinner, so the seal ring 22 can be made larger in the radial direction.
Rigidity can be improved.

Furthermore, the elastic ring 23 has a structure in which the housing 21 and the seal ring 22 are connected and fixed, thereby eliminating the need for an extension spring, a compression spring, a spring retainer, a snap ring, etc. It has become possible to reduce the number of assembled components and reduce costs.

[Effect of idea]

As explained above, according to the present invention, the cover ring disposed on the outer periphery of the seal ring is made of an elastic material such as rubber, thereby reducing leakage without increasing the processing accuracy of each assembly component. In addition, since the cover ring itself has the function of holding the seal ring on the inner circumference of the housing, it is possible to reduce costs by eliminating the need for extension springs, compression springs, spring retainers, snap rings, etc. in conventional structures. It has excellent practical effects, such as the ability to

[Brief explanation of the drawing]

FIG. 1 is a half-section side view of essential parts showing an embodiment of a split-type sealing device according to the present invention; FIG. 2 is a half-section side view showing a conventional split-type sealing device in use;
FIG. 3 is also a half-sectional front view of the main part. 20... Seal unit, 21... Housing, 22... Seal ring, 23... Elastic ring (cover ring), 23b, 23c... Flange portion.

Claims (1)

[Scope of utility model registration request] In a split type sealing device in which a cover ring is fitted around the outer periphery of an inner seal ring that is installed in the inner circumferential space of the housing and is divided with a gap in the circumferential direction, the cover ring is continuous in the circumferential direction. What is claimed is: 1. A split type sealing device, characterized in that the splitting type sealing device is made of an elastic material such as rubber, and has a flange portion on the cover ring that connects with the housing and the sealing ring.