JPS5937369A - Self sealing device of rotary shaft - Google Patents

Abstract

PURPOSE:To provide high sealing performance by excavating a conical bearing hole in the bearing member of a sealing device, furnishing the rotary shaft with a conical part mating with said hole with a minor clearance, forming a groove at the surface of this cone, and thereby securely checking the liquid movement by means of the centrifugal force of the cone. CONSTITUTION:Bearing member 10 of a self-sealing device C is composed of a cylindrical hole 11 and two conical bearings enlarging symmetrically 12, 12'. The shaft 20 is composed of a cylindrical shaft part 21 and a pair of solid cones 22, 22', which are connected with the shaft part 21 coaxially and form a minor clearance E between these and above-mentioned conical bearings 12, 12' of the bearing member 10. These cones 22, 22' are provided at their surfaces with eight grooves 23-23. When the rotary shaft 1 revolves at a high speed, the shaft 20 revolves also at a high speed to allow the liquid filling the groove 23 to move to the basis of the cones by means of the centrifugal force to return to the division for liquid A or B. Thus a sealing without contact part can be obtained with high reliability.

Description

[Detailed description of the invention] The present invention relates to a self-sealing device for a rotating shaft.

There are many cases where it is necessary to liquid-tightly seal the rotating shaft of a motor used in water in order to use it in liquid. For this purpose.

Although various sealing materials are used, the seals become incomplete due to aging such as wear and corrosion, and due to foreign matter being trapped. This problem is particularly severe with high-speed rotating shafts.

To solve this problem, self-sealing devices for the rotating shaft have been provided. This is different from the conventional method of placing a sealant in contact with the rotating shaft to shut off the liquid; this is because the rotating shaft does not come into contact with the bearing (there is no need for a sealant) at the sealing part. It has the advantage that there is no deterioration in sealing performance due to wear etc., and the need for maintenance is extremely low.

The present invention has been further improved to provide a self-sealing device for a rotary shaft.
Ir is provided.

According to the present invention, a bearing hole includes a cylindrical hole that holds a part of the rotating shaft with a slight clearance, and at least one conical hole that expands coaxially and continuously with the cylindrical hole; It is coaxially continuous with a cylindrical part (a part of the above-mentioned rotating shaft) corresponding to the shaped hole part. at least one solid conical portion corresponding to the conical hole with a slight clearance, the surface of which has at least one solid conical portion;
A self-sealing device for a rotating shaft is provided, which comprises a shaft body having a groove for holding a liquid.

In the self-sealing device of the present invention, two conical portions may be provided at each end of the nine cylindrical portions.

Moreover, even if the conical part is not a pure conical shape but a conical shape with a curved surface concave inward like a funnel-shaped part,
Conversely, it may be a curved surface that bulges outward in a dome shape.

In this specification, the term "conical part" includes those having curved surfaces.

If it has two conical parts, they may be joined at the top and there is no need for a cylindrical part.

When there are a plurality of grooves in the conical portion, they are arranged symmetrically with respect to the rotation axis, and may be in the form of grooves.

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

As shown in FIG.
It extends through the partition wall 2 that defines the area and is rotatably supported by means (not shown). A self-sealing device C of the present invention is provided at a location where the rotating shaft 1 penetrates the partition wall 2 to prevent the liquid A or B from moving to the other side and seal the liquid A or B.

This self-sealing device #C is roughly composed of a bearing member 10 provided on the partition wall 2 and a shaft body 20 formed coaxially with the one-rotation shaft 1.

The bearing member 10 has a cylindrical hole 11 that holds a cylindrical shaft portion 21 of the rotating shaft 1, which will be explained in detail later, with a slight clearance D, and is symmetrically continuous on both sides of the hole 11. Two conical bearings 12, 1 that extend coaxially
It consists of 2'.

On the other hand, the shaft body 20 has the cylindrical hole 1 of the bearing member 10.
1, and conical bearings 12, 12 of the bearing member 10 coaxially continuous with the shaft portion 21.
It consists of two solid conical portions 22° and 22' forming a slight clearance E between them. The surface of this conical portion 22, 22' has 1.
Eight grooves 25 to 23 are provided symmetrically with respect to the central axis 1 along the generatrix.

The shapes of the hole of the bearing member 10 and the shaft of the shaft body 20 are not limited to those,
For example, in the case of only one type A, the conical bearing 12' and the conical portion 22' on the right side of the drawing can be omitted.

Furthermore, the number of 1R23 on the surface of the 1 conical portion 22° 22' is not limited to the example shown in 9, but may be at least 1, and the shape is not limited to that, as shown in FIG. As shown, the first number (8 in this case) of 9
Grooves 26' arranged in a spiral pattern symmetrically with respect to the axis of rotation 1
It may be.

Next, the operation of this self-sealing device will be explained.

When the rotating shaft 1 rotates at a high speed, the shaft body 20 also rotates at a high speed, so that the liquid A or B filling the groove 23 moves toward the base of the cone due to centrifugal force.

Liquid A or B returns to the demarcated compartment. This results in 9
The fluid A straddles B that has entered the clearance E between the conical shaft portions 22, 22' and the holes 12, 12'.
It is guided to steps s23 to s23, and returns to the nine compartments divided by liquid A or liquid n in the same manner as described above. In this way, liquid A° or B
Even if it tries to move in the h- direction through the clearances E-D to E, it is returned to the section defined by the 9 conical part 12.12' + 10 centrifugal force, and the movement is reliably prevented and the The liquid displaced by the force is compensated by the liquid entering through the collar.

As is clear from the detailed explanation above.

The present invention has a simple structure in which a conical bearing hole is provided in a bearing member, and a conical part is provided in a single rotation shaft to correspond to the hole with a slight clearance, and a groove is formed on the surface of the conical part. Therefore, the movement of liquid is reliably prevented by the centrifugal force of the conical portion, and high sealing performance can be obtained. In addition, the clearance between the shaft body and the bearing hole always has the effect of returning the liquid to the defined compartment.
It acts as a type of lubrication, and since the centrifugal force is proportional to the number of revolutions, the sealing performance improves as the number of revolutions increases, contrary to conventional devices.

FIG. 4 shows an embodiment in which one cone-shaped portion forms a funnel-shaped portion of a trumpet concave inward.

FIG. 5 shows an embodiment in which one conical portion has a dome shape bulging outward.

FIG. 6 shows an embodiment in which the shaft body has an axial portion, and two conical portions are joined at their tops to form a wedge shape.

These aspects do not require special explanation as they have essentially the same structure and function as the preferred embodiments described above.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a preferred embodiment of the present invention. □Figure 2 is 1-1ft of Figure 1! The sectional view taken in the direction of the arrows, FIG. 3 is a drawing corresponding to FIG. 2 of another preferred embodiment of the present invention. 4th. 5. FIG. 6 is a drawing corresponding to FIG. 1 of still another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 2... Partition wall, 10... Bearing member,
11... Cylindrical hole, 12.12'... Conical hole. 20...11411 bodies, 21...Cylindrical shaft part,
22. 22'...conical part, 23.25'...
·Before. (11) Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] t. A bearing hole consisting of a cylindrical hole that holds a part of the rotating shaft with a slight clearance, and at least one conical hole that expands coaxially and continuously with the cylindrical hole; a cylindrical part (a part of the rotating shaft) corresponding to the cylindrical hole;
Continuing coaxially with this. a shaft body comprising at least one solid conical portion corresponding to the conical hole portion with a slight clearance and having at least one groove on the surface thereof for retaining a liquid; A self-sealing device for the rotating shaft. 2. The sealing device according to claim 1, wherein two solid conical portions of the shaft body are provided symmetrically on both sides of the cylindrical shaft portion. 3.% Allowance Claim 1 is also the sealing device according to claim 2, wherein the plurality of grooves are arranged symmetrically with respect to the rotation axis along the generatrix of the conical portion of the shaft body. What you have. 4. The sealing device according to claim 1 or 2, wherein the plurality of grooves are arranged in a spiral shape on the surface of the conical portion of the shaft body symmetrically with respect to the rotation axis. What you have. 5. The sealing device according to claim 6 or 4, wherein 4 to 8 grooves are provided in the conical portion of the shaft body. 6. The sealing device according to any one of claims 1 to 5, wherein the conical portion of the shaft body has a curved surface concave inward like a funnel-shaped portion of a trumpet. 1. The sealing device according to any one of claims 1 to 5, wherein the conical portion of the Ill+ body forms a curved surface that bulges outward in a dome shape. 8. A bearing hole consisting of a ring-shaped hole in which two cones are coaxially connected at their apexes; a similar solid ring-shaped shaft corresponding to the bearing hole with a slight clearance, A self-sealing device for a rotating shaft 1゜9, which has a groove for holding at least one liquid on its surface.The sealing device according to claim 8, which has a ``4.v number''. 11^1 grooves are arranged symmetrically with respect to the rotation 11'l11 along the generatrix of the conical part of the 1ul1 body. 10, 7t''llf' + Claim 8J (in 4) The sealing device described above, in which several grooves are arranged in a spiral pattern on the surface of the conical part of the shaft body symmetrically with respect to the rotation axis. 11. Range No. 9 of Special W1 Cocoon* The sealing device W according to item 1 or item 10, in which several grooves are arranged symmetrically with respect to the rotational axis along the 1υ angle of the conical part of the shaft body. 1. The sealing device according to claim 9 or 10, wherein the plurality of grooves are symmetrically arranged in a spiral manner on the surface rotation axis of the conical portion of the shaft body. 1.13. A sealing device W according to any one of claims 8 to 12, in which 111 conical portions are arranged inside in the shape of a funnel-shaped portion of a trumpet. The concave curved surface (6
) Eggplant. 14. The sole device according to any one of claims 8-12, wherein the conical portion of the shaft has a curved surface that bulges outward in a dome shape. ]5. 15. A sealing device according to any one of claims 8 to 14, wherein the conical shape formed by coaxially connecting two cones is asymmetrical. (4)