JPH081337Y2 - Bearing sealing device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a bearing seal device that can be mounted on a device that handles various fluids such as powder and liquid.
In particular, the present invention relates to a sealing device that seals a bearing of a rotating shaft that is inserted into a housing that stores a fluid.

[0002]

2. Description of the Related Art Conventionally, a bearing portion of a rotary shaft of a carrying screw for carrying molybdenum powder in a hopper has a structure as shown in FIG. First, a conventional technique will be described with reference to FIG.

Reference numeral 1 denotes a casing mounted on the lower end of a hopper (not shown) which contains molybdenum powder, and a rotary shaft 2 in which a transport screw (not shown) is formed. Has been inserted.

One end of the rotary shaft 2 penetrates one side wall 1a of the housing 1 and is held by a ball bearing 3 which is a bearing. In addition, the through hole of the side wall 1a of the housing 1,
Since an annular gap 4 is inevitably formed between the rotary shaft 2 and the rotary shaft 2, molybdenum powder may leak from the gap 4 to the outside of the housing 1. The seal members 5, 5, 5 are attached.

[0005]

As described above, in the prior art, the seal members 5, 5 for preventing the leakage of molybdenum powder between the ball bearing 3 and one side wall of the housing 1 are provided. 5 is attached, but when the fluid is hard such as molybdenum powder, the sealing member 5,
5 and 5 are easily damaged, molybdenum powder reaches the ball bearing 3, and the ball bearing 3 may be damaged.

Actually, this structure has a problem in that the ball bearing 3 is damaged within a few days to a few weeks, and the whole conveying device has to be stopped in order to replace or repair the ball bearing 3.

The present invention has been made in view of the above problems of the prior art, and aims to completely prevent leakage of fluid from the housing and prevent damage to the bearing.

[0008]

SUMMARY OF THE INVENTION The present invention seals a bearing of a rotary shaft, which is driven to rotate in a fixed direction and is inserted in a housing in which a fluid is stored, from the inside of the housing. In the sealing device, a male screw is formed on the outer periphery of the rotary shaft near the inner wall of the housing, and a fixed cylindrical body having an opening on the inner side of the housing is provided around the male screw. A rotary cylinder that surrounds the fixed cylindrical body, has an opening on the side wall side of the housing, and has an internal thread formed on the inner circumference, is fixed to the rotary shaft, and the male screw spiral is When the shaft is rotationally driven, the fluid inside the fixed cylindrical body is wound in a direction in which the fluid is moved to the inner side of the housing, and the spiral body of the male screw is a rotational cylindrical body when the rotational shaft is rotationally driven. Move the fluid inside to the side wall of the housing And it is characterized in that it is formed wound countercurrent.

[0009]

[0010]

[0011]

In the present invention, a male screw is formed on the outer periphery of the rotating shaft near the inner wall of the housing, and a fixed cylindrical body having an opening on the inner side of the housing is provided around the male screw. ,
A rotary cylinder that surrounds the fixed cylindrical body and is provided with an opening on the side wall side of the housing, and has a female screw formed on the inner circumference is fixed to the rotary shaft, and the spiral body of the male screw has the rotary shaft By being driven to rotate, the fluid inside the fixed cylinder is wound in a direction to move to the inside of the housing, and the spiral body of the male screw has a structure in which the rotary shaft is driven to rotate so as to rotate inside the rotating cylinder. Since it is wound in the direction of moving the fluid to the side wall of the housing, even if the fluid penetrates into the fixed cylindrical body, the rotating shaft rotates in the driving direction to move the fluid from the fixed cylindrical body. It is transferred to the rotating cylinder, and is forcibly returned to the housing from the rotating cylinder to prevent leakage from the housing to the bearing.

[0012]

[0013]

[0014]

1 is a sectional view of an embodiment of the present invention.

In FIG. 1, the same parts as those of the conventional example are designated by the same reference numerals and detailed description thereof will be omitted. This first embodiment is
This corresponds to the third main invention, and a male screw 6 is formed on the outer periphery of the rotary shaft 2 which is driven to rotate in the direction of the arrow in the vicinity of the inner wall 1a of the housing 1, and the male screw 6 is formed around the male screw 6. , Housing 1
A fixed cylindrical body 8 having an opening 7 is provided on the inner side of the. The fixed cylindrical body 8 is fixed to the inner wall 1a of the housing 1 such that the end surface on the opposite side of the opening 7 surrounds the through hole (annular gap 4) of the inner wall 1a of the housing 1. .

Further, the fixed cylindrical body 8 of the rotary shaft 2
A side wall of a cup-shaped rotating cylindrical body 9 is fixed to a portion slightly protruding from the opening 7 to the inside of the housing 1. The rotating cylindrical body 9 surrounds the fixed cylindrical body 8, is provided with an opening 10 in a portion facing the inner side wall 1a of the housing 1, and is formed with a female screw 11 on the inner circumference. Reference numeral 12 is a housing of the ball bearing 3.

Then, the spiral body of the male screw 6 (thread)
The molybdenum powder (not shown) that has entered the fixed cylindrical body 8 is rotated in the direction of arrow B (opening) inside the housing 1 by rotating the rotary shaft 2 in the direction of arrow A. It is spirally wound so as to move from 7 to the outside). Also, the spiral of the female screw 11 is
Is driven to rotate in the direction of arrow A, the molybdenum powder that has entered between the outer peripheral wall of the fixed cylindrical body 8 and the inner peripheral wall of the rotating cylindrical body 9 is removed by the arrow on the inner wall 1a side of the housing 1. C
It is spirally wound and formed so as to move in the direction (outward direction from the opening 10).

That is, even if the molybdenum powder reaches the vicinity of the gap 4 on the inner side wall 1a of the housing 1, the rotary shaft 2 is driven to rotate in a predetermined direction, so that the fixed cylindrical body 8 is formed.
The molybdenum powder inside passes through the opening 7 and the opening 10 of the rotary cylinder 9 and is returned to the inside of the housing 1.

Therefore, the molybdenum powder does not reach the ball bearing 3 and damage it. Actually, according to the present embodiment, even when the device was operated for one and a half years or more, the bearing portion did not change from the initial state at all. Although molybdenum powder is used as the fluid in the present embodiment, it goes without saying that the present invention can be applied not only to molybdenum powder but also to any fluid. Further, when the rotating shaft 2 rotates at high speed, the spiral body of the male screw 6 and the female screw 11 may have one thread (one ridge) as in the present embodiment, but when the rotating shaft 2 rotates at low speed. It is better to have multiple articles like Article 2 and Article 3.

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

Next, a fourth embodiment will be described with reference to FIG. This third embodiment corresponds to the first major idea and is a honing device. In this embodiment, the same parts as those in the second embodiment are designated by the same reference numerals and detailed description thereof will be omitted. In the fourth embodiment, neither the male screw 6 nor the fixed cylinder 8 and the rotating cylinder 9 are provided, but only the pipe line 14 and the through hole 13 for supplying and injecting clean water are provided. Has been.

[0027]

[0028]

According to the present invention, a male screw is formed on the outer periphery of the rotary shaft near the inner wall of the housing, and a fixed cylindrical body having an opening on the inner side of the housing is provided around the male screw. That is, the rotary cylinder surrounding the fixed cylindrical body, having an opening on the side wall side of the housing, and having a female screw formed on the inner circumference is fixed to the rotary shaft, and the spiral body of the male screw is The rotating shaft is rotationally driven to be wound in a direction in which the fluid inside the fixed cylindrical body is moved to the inner side of the housing, and the male screw helix is a rotating cylinder when the rotating shaft is rotationally driven. Since it is wound in the direction that moves the fluid inside the body to the side wall of the housing, even if the fluid penetrates into the fixed cylindrical body, the rotation axis rotates in the driving direction to fix the fluid. Transferred from the cylinder to the rotating cylinder, and then the rotating cylinder Forcibly returned to Luo housing, leakage into the bearing is prevented from the housing.

[0029]

[0030]

[0031]

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 1a Inner side wall 2 Rotating shaft 3 Ball bearing (bearing) 4 Gap 5 Sealing member 6 Male screw 7 Opening 8 Fixed cylindrical body 9 Rotating cylindrical body 10 Opening 11 Female screw 12 Housing

Claims (1)

[Scope of utility model registration request] 1. A seal device for sealing a bearing of a rotary shaft which is rotationally driven in a fixed direction and which is inserted in a housing in which a fluid is housed, from the inside of the housing. A male screw is formed on the outer periphery near the inner wall of the housing, and a fixed cylindrical body having an opening on the inner side of the housing is provided around the male screw and surrounds the fixed cylindrical body. Then, a rotary cylinder having an opening on the side wall side of the housing and having an internal thread formed on the inner circumference is fixed to the rotary shaft, and the spiral body of the external screw is driven by rotating the rotary shaft. The spiral of the male screw is formed by winding in a direction to move the fluid inside the fixed cylinder to the inside of the housing, and the male screw spiral drives the fluid inside the rotating cylinder to move the fluid inside the rotating cylinder to the side wall of the housing. It is wound in the direction of moving to the side. Sealing device of the bearing, characterized and.