JPH0128381Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to the improvement of a shaft sealing device related to shaft sealing technology, and in particular to improving the durability of a stationary outside shaft sealing device used as a vertical type. This is intended to improve the quality of life.

[Conventional technology]

Conventionally, as an example of this type of shaft sealing device, one shown in FIG. 3 has been known.

That is, in the figure, reference numeral 1 denotes a rotating shaft, 2 a casing integrally provided with an outer circumferential wall 3 having a drain hole 4, and the shaft sealing device is sealed in the shaft hole 5 of the casing 2. It is attached to the opening of the shaft hole 5 to prevent liquid A from leaking to the atmosphere. Reference numeral 6 denotes a cylindrical portion 7 inserted into the shaft hole 5 in an airtight state by fitting a sealing member such as an O-ring 8 into an annular groove formed on the outer peripheral surface, and an upper end of the cylindrical portion 7. A driven ring having a substantially L-shaped cross section and a flange portion 9 extending in the outer radial direction from the casing 2.
Rotation is prevented by engaging with a dowel pin 11 protruding from the upper end surface, and a recess 1 formed on the upper end surface
It is placed on a spring means such as a coil spring 12 mounted on a coil spring 12. Reference numeral 14 denotes a seat ring which is fitted in an airtight manner through a sealing member such as an O-ring 17 to a retainer 15 which is externally fitted onto the rotating shaft 1 by a set screw 16, and which is driven by the rotating shaft 1. A sealing sliding surface 19 is formed between the driven ring 6 and the sliding protrusion 18 formed at the upper end of the cylindrical portion 7.

[Problem that the invention attempts to solve]

The above-mentioned shaft sealing device presses the driven ring 6 upwardly against the seat ring 14 driven by the rotating shaft 1 by the elastic force of the coil spring 12, and applies appropriate surface pressure to the sealing sliding surface 19 to prevent the liquid from flowing. Liquid A that leaks from the sliding surface 19
When there is a problem, the leaked liquid is discharged from the drain hole 4, but when this is actually operated, the leaked liquid flows through the notch 10 of the driven ring 6 and flows into the recess where the coil spring 12 is attached. 13 or into the gap between the casing 2 and the cylindrical portion 7 of the driven ring 6, and especially if the liquid A contains slurry or dries to solidify, it may malfunction and cause abnormal leakage. There is.

In view of the above points, the present invention aims to provide a shaft sealing device that is configured to prevent leakage liquid from entering recesses, etc., and that can withstand long-term use without causing malfunction. .

[Means for solving problems]

In order to achieve the above object, the shaft sealing device of the present invention is provided with a protrusion on the lower surface of the flange of the driven ring for regulating the position where the leaked liquid flows down, and also on the upper end surface of the casing to flow out the leaked liquid in the outer diameter direction. It has a structure in which a stepped portion is provided.

[Effect]

That is, the shaft sealing device of the present invention uses the protrusion and the stepped portion as guides to reliably flow out the leaked liquid in a predetermined discharge direction.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In the shaft sealing device shown in FIG. 1, parts that overlap with the configuration of the conventional device shown in FIG.

On the lower surface of the flange portion 9 of the driven ring 6, there is a groove located on the inner diameter side of the notch 10 formed at the tip of the flange portion 9, which is slightly wider than the width of the notch 10 in the inner circumferential direction, and extends toward the lower end as shown in the figure. A protrusion 20 having a tapered cross-sectional shape is integrally formed on the upper end surface of the casing 2, and has a height on the recess 13 side and a low height on the knock pin 11 side between the position where the recess 13 is formed and the position where the knock pin 11 is erected. Annular stepped portion 21
is formed, and when comparing both 20 and 21, the protrusion 20 is located slightly on the outer diameter side.

In the shaft sealing device having the above configuration, the sealing sliding surface 19
When liquid leaks from the flange portion 9 of the driven ring 6, the leaked liquid is transmitted from the upper surface of the flange portion 9 of the driven ring 6 into the notch 10 and reaches the protrusion 20, and flows down onto the casing 2 due to the so-called draining action of the protrusion 20, and is drained by the stepped portion 21. Since the flow is restricted in the inner diameter direction,
The water is reliably discharged from the drain hole 4 along the slope 22.

FIG. 2 shows a second embodiment of the present invention in which the protrusion is formed separately from the driven ring 6. That is, a ring member 23 having a protrusion 24 integrally formed on the outer diameter end thereof is fitted onto the lower surface of the flange portion 9, and the leakage liquid is flushed away by the draining action of the protrusion 24.

[Effect of idea]

As explained above, the shaft sealing device of the present invention is provided with protrusions and steps that serve as guides for discharging leaked water in a predetermined direction, and is configured to prevent leaked water from entering recesses, etc. It has the characteristics of preventing the occurrence of malfunctions caused by the leaked liquid and having excellent long-term durability. It goes without saying that the protrusions 20 and 24 and the stepped portion 21 described in the above embodiments are merely examples. Various modifications such as these are possible.

[Brief explanation of the drawing]

Fig. 1 is a half-cut sectional view of a shaft sealing device according to an embodiment of the present invention, Fig. 2 is a sectional view of main parts of a shaft sealing device according to another embodiment, and Fig. 3 is a shaft sealing device according to a conventional example. FIG. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 2... Casing, 4... Drain hole, 5... Shaft hole, 6... Driven ring, 7... Cylindrical part, 8, 17... O-ring, 9... Flange part, 10 ...Notch, 12...Coil spring,
14... Seat ring, 19... Sealing sliding surface, 2
0, 24...Protrusion, 21...Step part, 23...Ring member.

Claims (1)

[Scope of utility model registration request] A cylindrical part is inserted into the shaft hole of the casing and has a sealing member fitted between it and the inner wall of the shaft hole, and a spring member that extends from one end of the cylindrical part in the outer radial direction and is placed on the underside keeps the cylindrical part upward at all times. a driven ring having a substantially L-shaped cross section and having a flange portion that is elastically pressed;
In a stationary outside shaft seal device that is used vertically and is composed of a seat ring that is located above the driven ring and rotates following the rotation shaft, leakage liquid flows down to the lower surface of the flange of the driven ring. A shaft sealing device characterized in that a protrusion for regulating the position is provided, and a stepped portion is provided on the upper end surface of the casing to drain out the leaked liquid in the outer diameter direction.