JPS6040935Y2 - sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device, and particularly provides a sealing device useful for use in washing machines.

Conventionally, when the fluid to be sealed is water, alcohol, etc., due to the heat generation phenomenon in the sliding part between the rotating shaft and the sealing means,
This solves the problem of the sealed fluid evaporating from the sliding part, entering the opposite side of the sealed fluid, and then repeating the process of this vapor returning to liquid and entering the bearing, eventually corroding the bearing. It was causing it.

In order to prevent corrosion of the bearing due to this invading steam, a structure shown in Fig. 2 of the Japanese Utility Model Publication No. 54-176 is known as an example equipped with a method for releasing the evaporated sealed fluid to the outside. There is.

This prior art will be explained based on FIG. Forms a mating inner circumferential surface that receives the mating,
A second sealing member 20 that prevents leakage of the working fluid in the cavity A
is provided with a seal lip 27 that seals and slides on the circumferential surface of the rotating shaft 2, and has a fitting outer circumferential surface 25 that fits with the fitting inner circumferential surface 32 of the outer circumferential fitting portion of the first sealing member 30. The inner circumferential seal lip 22 and end seal lip 23, which are in sealing pressure contact with the recess 33 on the lower surface of the casing bottom 1, are supported by the flange portion 26 that expands radially outward from the fitting cylindrical portion 24.

At least one communication groove 34 is provided at the joint where the first sealing member 30 and the second sealing member 20 fit into each other, and communicates the cavity B with the outside atmosphere, as shown by the arrow in the figure. I'm letting you do it.

In the conventional sealing device described above, the flow groove 34 is provided between the fitting surfaces of the first sealing member 30 and the second sealing member 20, so the structure is complicated and the manufacturing cost is high. It had the disadvantage of being expensive.

In order to solve the above-mentioned drawbacks of the conventional technology, the present invention
A first sealing lip made of a rubber-like elastic material that sealsly slides on the outer peripheral surface of the rotating shaft is integrally provided at the radially inner end of the first metal reinforcing ring having a cross-sectional shape. A first sealing means having an outer circumferential surface of a first axial portion of the metal reinforcing ring fitted onto an inner circumferential surface of the bearing case; A second sealing lip made of a rubber-like elastic material that sealsly slides on the rotating shaft is provided at the radially inner end of the second metal reinforcing ring fitted to the axial end. and a second sealing means provided with a gasket portion extending in the axial direction from the radially outer end of the gasket and having a protrusion that comes into close contact with the radially inner circumferential surface of the bottom portion,
In order to communicate the annular cavity surrounded by the outer circumferential surface of the rotating shaft, the first sealing means, and the second sealing means with the outside atmosphere, a through hole is bored in the first axial portion, and a gasket portion and a bearing are provided. By forming a flow gap with the case, steam that has entered the annular space can be easily discharged to the outside atmosphere.

Next, one embodiment of the present invention will be described in detail based on FIG.

A rotating shaft 2 extending through the bottom 1 of the casing that stores the fluid to be sealed is supported by a bearing case 4 via a bearing 3, while a first sealing means 7 and a second sealing means 12 The assembly is fitted and held on the inner peripheral surface of the bearing case 4.

The first sealing means 7 includes a first sealing lip made of a rubber-like elastic material that seals and slides on the outer peripheral surface of the rotating shaft 2 at the radially inner end of the first metal reinforcing ring 5 having a cross-sectional shape. 8, and the outer circumferential surface of the first axial portion 6 of the first metal reinforcing ring 5 is configured to fit into the inner circumferential surface of the bearing case 4.

The second sealing means 12 has an outer peripheral surface of a second metal reinforcing ring 10 having a substantially double-shaped cross section fitted onto an axial end of the first axial portion 6, and the second metal The reinforcing ring 10 has a second seal lip 13 made of a rubber-like elastic material that sealsly slides on the outer circumferential surface of the rotating shaft 2 at the inner end in the radial direction.
A gasket portion 14 extends in the axial direction from the radially outer end of the metal reinforcing ring 10, is in close contact with the radially inner circumferential surface of the bottom portion 1, and forms an annular flow gap 15 with the outer circumferential surface of the bearing case 4. It is attached.

The gasket part 14 has a lip-shaped protrusion 19 that comes into close contact with the radial inner circumferential surface of the bottom part 1, and the spring means 11 for pressing this protrusion against the inner circumferential surface is attached to the inner circumference corresponding to the protrusion 19 of the gasket part 14. It is placed on the circumferential side.

In the sealing device having such a configuration, the rotating shaft 2 circumferential surface, the first
The gas containing steam in the annular space 17 surrounded by the sealing means 7 and the second sealing means 12 flows through the circulation formed between the through hole 9 and the inner surface of the gasket part 14 and the outer peripheral surface of the bearing case 4. It is discharged through the gap 15 into the outside atmosphere.

The sealing device of the present invention has the above-described configuration and has the following effects.

■ A flow path for discharging the gas in the cavity 17 is
Since it is constituted by a through hole provided in the first axial portion of the first sealing means, the overall discharge path is shortened, and the gas in the cavity 17 can be efficiently discharged.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a sealing device according to the prior art, and FIG.
The figure is a sectional view showing an embodiment of the present invention. 1... Bottom, 2... Rotating shaft, 3...
...Bearing, 4...Bearing case,
5...First metal reinforcing ring, 6...First
an axial portion of 7...first sealing means;
...First seal lip, 9...Through hole,
10... Second metal reinforcing ring, 12...
Second sealing means, 13... Second seal lip, 14... Gasket portion, 15...
Flow gap, 17... Vacancy, 19... Protrusion, 20... Second sealing member, 21...
・Outer periphery fitting part, 22... Inner periphery seal lip,
23... End seal lip, 24...
Fitting cylindrical portion, 25... Fitting outer peripheral surface, 26...
...Brim portion, 30...First sealing member, 32
......Inner peripheral surface for fitting, 33...Recess, 34
...... Distribution channel.

Claims (1)

[Scope of utility model registration request] A rotating shaft 2 passing through the bottom 1 of a casing that stores a fluid to be sealed, a bearing case 4 supporting the rotating shaft 2 via a bearing 3, and a radially inner end of a first metal reinforcing ring 5 having an abbreviated cross-section. The first seal lip 8 made of a rubber-like elastic material is integrally formed with the outer circumferential surface of the rotating shaft 2 and slides in a sealing manner, and the first axial portion 6 of the first metal reinforcing ring 5 A first sealing means 7 whose outer circumferential surface is fitted onto the inner circumferential surface of the bearing case 4 and a first sealing means 7 having a substantially Z-shaped cross section and fitted onto the axial end of the first axial portion 6. The rotating shaft 2 is attached to the radially inner end of the second metal reinforcing ring 10.
The second metal reinforcing ring 1 has a second seal lip 13 made of a rubber-like elastic material that sealsly slides on the outer peripheral surface of the second metal reinforcing ring 1.
The first axial portion comprises a second sealing means 12 having a gasket 14 provided with a protrusion 19 extending in the axial direction from the radially outer end of the bottom portion 1 and in close contact with the radially inner circumferential surface of the bottom portion 1; 6 is bored with a through hole 9, and a flow gap 1 is formed between the gasket portion 14 and the bearing case 4.
5, the circumferential surface of the rotating shaft 2, the first
A sealing device which communicates the inside of a space 17 surrounded by the sealing means 7 and the second sealing means 12 with the outside atmosphere.