JPH0229308Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a non-contact type shaft sealing device for sealing a rotating shaft portion of a machine body such as a pump device.

[Conventional technology]

Conventionally, in this type of shaft sealing device, as shown in FIG. 2, when sealing the periphery of the rotating shaft 2 inserted into the casing 1 of the aircraft body, a fixed ring fixed to the casing 1 side is used. There is a device that has a configuration in which a pair of sealing rings consisting of a rotary ring 3 and a rotary ring 4 fixed to the rotary shaft 2 side are arranged to face each other in the axial direction.

As shown in FIG. 3, the sealing ring 5, which becomes the fixed ring 3 or the rotating ring 4, is attached to a retainer 6 via an O-ring 7, and the sealing surface 8a is oriented in the radial direction. It is assembled with a face plate 8 having a tapered shape and a holder 10 which fastens and holds the face plate 8 to the retainer 6 with bolts 9.

[Problem that the invention attempts to solve]

However, in the shaft sealing device having such a conventional structure, since the assembly structure is such that only the outer peripheral edge 81 of the face plate 8 is fastened and held by the holder 10, the retainer attached via the O-ring is A gap A is generated between the mating surfaces on the inner diameter side between the face plate 6 and the face plate 8, and due to the generation of this gap A, the accuracy of the mutual sealing surfaces in the assembled product is poor, and the sealing surfaces in the radial direction are Not only is it impossible to accurately measure the amount of taper, but also foreign matter tends to enter and accumulate, resulting in problems such as deterioration of sealing performance.

[Purpose of invention]

The present invention was developed under the above circumstances, and its purpose is to improve the accuracy of the sealing surface by assembling the sealing ring and the accuracy of measuring the amount of taper in the radial direction of the sealing surface. An object of the present invention is to provide a non-contact type shaft sealing device.

[Means for solving the problems] In order to solve the above problems, the present invention:
A fixed-side sealing ring fixed to the casing side and a rotating-side sealing ring fixed to the rotating shaft side cover the periphery of the rotating shaft inserted into the casing, and each of these sealing rings is connected to an O-ring. In a non-contact type shaft sealing device, the tapered seal surfaces of face plates whose back surfaces are supported by a retainer via the retainer face each other in the axial direction in a non-contact state. A pair of annular holders disposed so as to close the periphery are used to fasten the parts, and the O-rings interposed between the facing surfaces are appropriately compressed by the fastening.

[Effect]

That is, the present invention has the above-described configuration, so that the gap between the opposing surfaces of the face plate and the retainer is sealed on the inner and outer peripheries by a pair of annular holders, and the fastening of both holders is By adjusting the amount of compression of the O-ring interposed between the opposing surfaces by force, the amount of taper of the sealing surface of the face plate can be appropriately set, and the sealing performance can be improved.

〔Example〕

The present invention will be explained below with reference to an embodiment shown in FIG. In the illustrated embodiment of the present invention, the same reference numerals are used for parts having the same structure as those of the conventional non-contact type shaft sealing device shown in FIGS. 2 and 3, and the explanation thereof will be omitted.

That is, the non-contact type shaft sealing device according to the present invention has the following features:
As shown in FIG. 1, the face plate 8 is connected to the retainer 6 through a pair of annular holders 10, 10, which are fastened to the retainer 6 with bolts 9, 11 at both peripheral edges 81, 82 of the outer diameter part and the inner diameter part. is held by the retainer 6, and both the holders 10, 1
0 seals the gap between the opposing surfaces of the retainer 6 and the face plate 8 from the inner and outer peripheries thereof, and
Since the amount of compression applied to the O-ring 7 interposed between the opposing surfaces can be finely adjusted, the sealing ring 5 is assembled with the sealing surface 8a of the face plate 8 properly set. .

In the above-mentioned embodiments, the non-contact type shaft sealing device for a vertical shaft was explained as an example, but a device for a horizontal shaft may also be used, and the selection thereof is arbitrary.

In addition, it goes without saying that the present invention can be modified in various ways without departing from the gist of the invention.

[Effect of idea]

As is clear from the above description, according to the present invention, the gap between the facing surfaces of the face plate and the retainer is sealed by a pair of annular holders on the inner and outer peripheries, so that foreign matter can not enter the gap. It is possible to prevent accumulation, and the amount of compression of the O-ring interposed between the opposing surfaces can be finely adjusted by the fastening force of the two holders, so the amount of taper of the sealing surface of the face plate can be appropriately set. This has the excellent effect of improving sealing performance.

[Brief explanation of the drawing]

FIG. 1 is a schematic enlarged sectional view of a main part of a sealing ring showing an embodiment of a non-contact type shaft sealing device according to the present invention;
The figure is a schematic cross-sectional view of the main part of a conventional non-contact type shaft sealing device, and FIG. 3 is a schematic enlarged cross-sectional view of the main part of the sealing ring. 1... Casing, 2... Rotating shaft, 3... Fixed ring, 4... Rotating ring, 5... Sealing ring, 6... Retainer, 7... O-ring, 8... Face plate, 81... Outside Radial side peripheral edge, 82... Inner radius side peripheral edge, 9... Bolt, 10... Holder, 11...
bolt.

Claims (1)

[Scope of utility model registration request] A fixed-side sealing ring fixed to the casing side and a rotating-side sealing ring fixed to the rotating shaft side cover the periphery of the rotating shaft inserted into the casing, and each of these sealing rings is connected to an O-ring. In a non-contact type shaft sealing device, the tapered sealing surfaces of a face plate whose back surfaces are supported by a retainer via a retainer face each other in a non-contact state in the axial direction. A non-contact type shaft sealing device, characterized in that it is fastened by a pair of annular holders arranged so as to close the periphery, and by the fastening, an O-ring interposed between the opposing surfaces is appropriately compressed.