JPH0467064B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shaft sealing device for a rotating shaft that passes through a fluid tank containing water, oil, dust, powder, etc.

(Prior art) Conventionally, as shown in FIG. 3, a sleeve 3 is fitted and fixed on a rotating shaft 2 passing through a fluid tank 1, a packing holder 4 is fitted into a shaft hole 1a of the fluid tank 1, and a bolt 5 is fitted.
Fix the inner flange 4a to the side wall of the fluid tank 1 with Insert the seal plate 8 fitted into the annular groove 6 from the outside, tighten the collar 8a to the side wall of the fluid tank 1 with bolts 9, and seal the seal plate 8 with the ring packing 7 on the tip surface.
A shaft sealing device in which the sealing member is crimped onto the inner surface of the inner flange 4a of the packing holder 4 is well known.

(Problems to be Solved by the Invention) By the way, in the above-mentioned prior art, the ring packing 7 which is crimped into the ring groove 6 when replacing the packing.
It is not easy to remove and requires the use of tools, and it is very time-consuming to remove the rotating shaft from the bearing and remove the ring packing.Furthermore, since the rotating shaft is long, eccentricity at the ring packing is a problem. If there is no sleeve, the inner surface of the ring packing placed around the outer circumference of the rotating shaft will be scraped and the surface of the rotating shaft will also be scraped when the fluid in the fluid tank is filled with liquid, especially sludge and powder, so a sleeve is required. It has to be replaced frequently, and the replacement work requires removing the entire rotating shaft from the bearing, which takes a long time, and there are problems in that the sealing properties of the rotating shaft are poor.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems by fixing a gasket holder to a rotating shaft passing through a fluid tank, and attaching the collar of the gasket holder to the axis of the fluid tank. Fit it into the hole, wrap the elongated gland packing in a flat shape on the outer surface of the flange, and fit the seal plate into the shaft hole. Tighten the flange of the seal plate to the side wall of the fluid tank with bolts, and place the gland packing on the outer surface of the flange. Crimp and connect O between the outer surface of the seal plate and the inner surface of the shaft hole.
This device is characterized in that a ring is provided to seal the fluid tank shaft hole.

Hereinafter, a detailed explanation will be given based on the illustrated embodiment. Reference numeral 10 denotes a fluid tank in which sludge is stored, and reference numeral 11 denotes a rotating shaft that extends horizontally through the side wall of the fluid tank 10. 12 is a packing holder fixed to the rotating shaft 11, and the collar 12a at one end is inserted into the shaft hole 10 formed in the side wall of the fluid tank 10, and a ring groove 12b on the outer surface of the collar 12a is filled with elongated asbestos, carbon-impregnated asbestos, etc. The ground packing 13 is wound into a flat shape, and the seal plate 14 is attached to the shaft hole 10.
a, and tighten the flange 14a of the seal plate 14 to the side wall of the fluid tank with the bolt 15 via the spring 16 to attach the gland packing 13 to the flange 12a.
Crimp the outer surface of the seal plate 14 and the shaft hole 1.
An O-ring 17 is arranged between the inner surfaces of 0a. O on the inner surface of the packing holder 12 and the outer surface of the rotating shaft 11.
Rings 18, 19 are provided.

Next, the effect will be explained. When the rotating shaft 11 rotates, the packing holder 12 and the gland packing 13 also rotate together, and at this time, the sludge in the fluid tank 10 flows into the gap 2 between the outer surface of the collar 12a and the inner surface of the shaft hole 10a.
0, but since it is blocked by the O-ring 17 in that direction, it flows into the gap 21 in the axial direction, and attempts to flow into the gap 22 between the outer surface of the seal holder 12 and the inner surface of the seal plate 14, but the gap 20 is a gap. Since it is located radially outward from 22, it is difficult for it to flow in from the outside due to centrifugal force, and the gland packing 13 prevents the inflow. Further, sludge that attempts to flow between the outer surface of the rotating shaft 11 and the inner surface of the packing holder 12 is blocked by O-rings 18 and 19. Also, even if the rotating shaft 11 rotates eccentrically, the spring 1
It has a structure that allows it to be absorbed at 6. When replacing the gland packing 13, leave the rotating shaft 11 as is, remove the bolt 15, and replace the seal plate 1.
It can be easily removed by removing 4.

(Effects) According to the present invention, a packing holder is fixed to a rotating shaft that passes through a fluid tank, the flange of the packing holder is inserted into the shaft hole of the fluid tank, and an elongated gland packing is wound in a plane on the outer surface of the flange. Then, fit the seal plate into the shaft hole, tighten the flange of the seal plate to the side wall of the fluid tank with bolts, press the gland packing to the outer surface of the flange, and place an O-ring between the outer surface of the seal plate and the inner surface of the shaft hole. Since the shaft hole of the fluid tank is sealed, the elongated gland packing can be easily replaced while the rotary shaft is supported on the bearing, and leakage of liquid in the fluid tank can be reliably prevented.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of the main part of one embodiment of the present invention;
The figure is a first sectional view taken along the line AA, and FIG. 3 is a front sectional view of the conventional device. 10...Fluid tank, 10a...Shaft hole, 11...Rotating shaft,
12...Packskin holder, 12a...Tsuba, 12b...
Ring groove, 13... Gland packing, 14... Seal plate, 14a... Flange, 15... Bolt, 17, 1
8,19...O-ring.

Claims (1)

[Claims] 1. Fix the packing holder to the rotating shaft that passes through the fluid tank, fit the flange of the packing holder into the shaft hole of the fluid tank, wrap the elongated gland packing in a planar shape on the outer surface of the flange, and attach the seal plate to the shaft. Insert the seal plate into the hole, tighten the flange of the seal plate to the side wall of the fluid tank with bolts, press the gland packing to the outer surface of the flange, place an O-ring between the outer surface of the seal plate and the inner surface of the shaft hole, and secure the fluid tank shaft hole. Sealed shaft seal device.