JPS6330852Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealing device in which a counter face and a sealing member slidingly in contact with the counter face are integrated by the flinger into a sleeve with a flinger that is fitted and fixed to a rotating shaft. More specifically, the present invention relates to an improvement of a sleeve with a flinger that constitutes a mechanical seal.

A detailed description will be given below with reference to the drawings.

Conventionally, many configurations as shown in FIG. 1 have been proposed as this type of sealing device. That is, a flange 3 is formed at one end of the sleeve A that is fitted and fixed to the rotating shaft 2 that requires sealing, and an annular contact ring 4 is fitted to the side of the flange 3 to be integrated with the sleeve A. A sealing device is constructed by loosely fitting a sealing member that comes into sliding contact with the ring 4. However, in the above-mentioned sealing device, there is no part between the rotating shaft 2 and the inner peripheral surface of the sleeve A fitted on the rotating shaft 2 to allow moisture permeated through the sleeve A, etc. to escape. Moisture tends to accumulate between the inner circumferential surfaces of the sleeve A, and this moisture is repeatedly cooled and heated during machine operation, resulting in the early formation of rust on the rotating shaft 2, etc. The present invention eliminates these drawbacks and provides an ideal mechanical seal.

An embodiment of the present invention will be explained with reference to FIG.
In sleeve A, which is made of a cylindrical body made of synthetic rubber or synthetic resin, an annular flange 3 is formed at one end of the sleeve A, and a funnel-shaped flinger 5 is formed at the other end. 5. At least one groove 1 of appropriate size and depth is provided from the tip of the inner circumferential surface to the middle of the sliding surface of one counter face. By providing the groove 1, when the rotating shaft 2 is rotating, a small amount of water that has permeated and accumulated from the sleeve A etc. between the rotating shaft 2 and the inner peripheral surface of the sleeve A is transferred to the flinger 5 side by the groove 1. The moisture accumulated at the tip of the flinger 5 is shaken off from the tip of the flinger 5 into the housing by the rotational movement of the sleeve A.

On the other hand, as shown in Fig. 3, in the mechanical seal fitted to the stepped rotating shaft 2', in the conventional product there is moisture, especially between the stepped portion 6 of the inner peripheral surface of the sleeve A and the stepped portion of the rotating shaft 2'. However, according to the present invention, the inner circumferential surface of the sleeve A includes the stepped portion 6 from the tip of the inner circumferential surface of the flinger 5, and extends halfway up to the end surface on one counter face side. By providing several grooves 1 with appropriate dimensions, moisture is not accumulated on the inner peripheral surface of the sleeve A and on the bearing side, and is scattered into the housing by the rotation of the flinger 5, similar to the effect described above. Since moisture is not retained between A and the rotating shaft 2', it is possible to prevent the rotating shaft 2' from rusting due to moisture. In addition, although the groove 1 provided on the inner circumferential surface of the sleeve A is shown as a straight line in FIGS. 2 and 3, it can also be formed in a curved shape, which has a greater moisture removal effect due to rotational motion, or in a spiral shape, to achieve the above-mentioned drainage effect. are exhibited in the same way, regardless of their shape.

In addition, when the mechanical seal of the present invention is press-fitted, the air accumulated between the rotating shafts 2, 2' and the inner peripheral surface of the sleeve A is discharged through the groove 1, so that the press-fitting is smooth and the fitting can be performed accurately. There are also some effects.

That is, according to the present invention, the fluid relief groove 1 is formed in the inner circumferential surface of the elastic sleeve A that is fitted and fixed to the rotating shafts 2, 2', and has an arbitrary dimension from the tip of the inner circumferential surface of the flinger 5 to the middle of the inner circumferential surface of the sleeve A. Ideally, the simple structure of providing a seal prevents moisture from accumulating between the rotating shafts 2, 2 and the inner circumferential surface of the sleeve A, making it possible to easily and accurately fit the entire sealing device with a high rust prevention effect. It is a mechanical seal.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional mechanical seal. FIG. 2 is a sectional view of an embodiment of the mechanical seal according to the present invention. FIG. 3 is a sectional view showing another embodiment of the present invention. A...Sleeve, 1...Groove, 2...Rotating shaft,
2'...Stepped rotating shaft, 3...Annular flange, 4...
...Contact ring, 5...Flinger, 6...
Stepped part of sleeve.

Claims (1)

[Scope of utility model registration request] In a mechanical seal that rotates with one of the rotating shafts and has smooth sliding surfaces that are perpendicular to the rotating shaft, and that prevents leakage of the sealed fluid by the contact pressure between the two sliding surfaces; On the inner circumferential surface of a rotary shaft-mounted rubber sleeve that integrates the constituent counterface and seal, there is a part that does not reach the sliding surface position of one counterface from the tip of the inner circumferential surface of the flinger, which is one end of the sleeve. A mechanical seal characterized by having at least one or more grooves of arbitrary dimensions provided therein.