JPH01141276A - Bearing device for rotary shaft - Google Patents

Abstract

PURPOSE:To prevent abrasion of bearing and to maintain good sealing performance for a long term by arranging sealing members with predetermined interval between a rotary shaft and a housing and forming liquid pressure chambers between the sealing members. CONSTITUTION:A rotary shaft 8 is arranged rotatably through a bearing 9 between upper and lower sections 5, 6 of a housing 4 provided at the lower section of a tank. Sealing members, i.e. V seals 24-28, are inserted between a retainer 21 and the rotary shaft 8. A liquid pressure chamber 31 and a drain chamber 32 are formed respectively at the upper and lower sections of a V seal 27. Air is fed through an air path 35 to provide high pressure continuously into the liquid chamber 31 so as to block solution leaking through the V seals 24-26 thus preventing leakage to the bearing 9 side.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) This invention relates to a rotating shaft bearing device, and more particularly to a rotating shaft bearing device that seals a rotating shaft bearing provided at the bottom of a tank. .

(Prior art) For example, in the production process of the chemical industry, stirring and dissolving fluids are generally indispensable operations.6 In particular, when the production process is carried out in a batch manner, etc. may be dissolved in a mixer.

Melting using a mixer is carried out by rotating a propeller, which is attached to a rotating shaft that is rotatably supported by a bearing device provided at the bottom of the mixer, and is connected to a motor, etc. It is rotated by a drive device.

Incidentally, a solution such as an inorganic salt may enter from the rotating part of the propeller, and if this solution enters the bearing side of the rotating shaft, the bearing may be worn or damaged. For this reason, some devices provide a mechanical seal or seal by injecting air to prevent the solution from entering.

(Problems to be Solved by the Invention) By the way, if a mechanical seal is provided in the bearing device of the rotating shaft, when a solution such as an inorganic salt is stirred, if the solution gets into the mechanical seal part, the seal member will be damaged. ,
If used for a long period of time, it may swell on the bearing side and prevent smooth rotation of the rotating shaft.

Also, when sealing by injecting air, air may enter through the mixer, causing oxidation of the solution or
In the case of highly adhesive liquids, there are problems such as difficulty in removing air bubbles.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bearing device for a rotating shaft that has a simple structure and can reliably seal the bearing.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a bearing device for a rotating shaft in which the rotating shaft is rotatably supported via a bearing in a housing provided at the bottom of the tank. A sealing member is arranged at a predetermined distance between the rotating shaft and the housing, and a hydraulic chamber is formed between the sealing members and pressurized with a predetermined pressure to seal the bearing. It is characterized by

(Function) In this invention, for example, when dissolving a solution such as an inorganic salt,
If the solution ever enters the rotating shaft, it is blocked by a hydraulic chamber formed by a sealing member, and is prevented from entering the bearing side of the rotating shaft. This prevents the bearing from being worn out or damaged by the solution entering from the rotating part.

(Example) Next, an example of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a schematic diagram of a bearing device for a rotating shaft according to the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a sectional view taken along line m-III in FIG. 2, and FIG.
The figure is a sectional view taken along line rV-IV in FIG. 2.

In the figure, reference numeral 1 denotes a mixer for dissolving, for example, inorganic salts, and a bearing device 3 for a rotating shaft is provided at the bottom of a tank 2 of the mixer. The housing 4 of this bearing device 3 has an upper portion 5
The upper part 5 of the housing 4 is fixed to the bottom of the tank 2 via a bracket 7. An upper portion 5 of the housing 4 projects into the tank 2 from below.

A rotating shaft 8 is mounted on a bearing 9 in the upper part 5 and lower part 6 of the housing 4.
It is rotatably provided via 10. This rotating shaft 8
A pulley 11 is provided at the bottom of the motor 12 , and this pulley 11 is connected via a belt 15 to a pulley 14 provided on an output shaft 13 of a motor 12 , and is rotated by the drive of the motor 12 .

The upper part of the rotating shaft 8 protrudes from the upper part 5 of the housing 4, and a propeller cover 16 and a propeller 17 are attached to this protruding part, and these are connected to a nut 19 through a gasket 18.
A cap 20 is screwed onto the tip of the 0-rotation shaft 8, which is fixedly tightened and can rotate integrally with the rotation shaft 8.

As shown in FIG. 2, a retainer 21 is inserted into the upper part 5 of the housing 4, and is prevented from being removed by an annular ring 23 which is fastened to the tip of the upper part 5 with a tightening port 22.

V-seals 24 to 28, which are sealing members, are inserted between the retainer 21 and the rotating shaft 8, and the portions of the sealed 0-rotating shaft 8 that contact the V-seals 24 to 28 are ceramic-processed to prevent wear and tear. The structure is designed to prevent

The V-seals 24 to 26 are arranged in connection with the propeller 1f side, and the ■ seal 28 is arranged in connection with the bearing 9 side,
A V-seal 2 is provided between the two through rings 29 and 30.
A valve is placed on the top of the V-seal 27 so that a hydraulic pressure of 1
A drain chamber 32 is formed in the lower part of i31. The hydraulic pressure chamber 31 is filled with liquid and has a higher pressure than the solution pressure at the bottom of the tank 2, and is connected to the air passage formed in the upper part 5 of the housing 4 via the passage 33 of the ring 29 and the passage 34 of the retainer 21. It is connected to 35. This air passage 3
Air is supplied from 5, and a pressure higher than the solution pressure at the bottom 2 of the mixer 1 is always applied to the hydraulic chamber 31. I try not to get caught.

Drain flowing downward from the hydraulic pressure 1i31 is stored in the drain chamber 32, and the drain is discharged from the drain chamber 32 through the passage 36 of the ring 30 and the passage 3 of the retainer 21, and the drain is discharged from the V seals 24 to 26. This prevents them from entering the tank 2. The drain discharged from this passage 3 is further discharged downward from a drain passage 38 formed in the upper part 5 of the housing 4, thereby preventing it from leaking toward the bearing 9 below. .

Further, a cleaning water passage 39 is formed in the upper part 5 of the housing 4 from below to the upper side, and cleaning water is supplied from the cleaning water passage 39 to the upper part 5 of the housing 4 and the retainer 21.
The space between the propeller cover 16 and the propeller cover 16 can be cleaned.

Although this embodiment has been applied to a bearing device for a rotating shaft of a propeller of a mixer, it can be applied not only to a mixer but also to bearing devices for various rotating bodies.

(Effects of the Invention) As explained above, the present invention arranges a sealing member between a rotating shaft and a housing at a predetermined interval, forms a hydraulic chamber between the sealing members, and applies pressure at a predetermined pressure. Since the bearing of the rotating shaft is sealed by applying pressure, for example, when dissolving a solution such as an inorganic salt, even if the solution enters the rotating shaft, the liquid pressure generated by the sealing member will be removed. It is blocked by the chamber and is prevented from entering the bearing side of the rotating shaft. Therefore, the bearing is prevented from being worn out or damaged by the solution entering from the rotating part, and can be used satisfactorily for a long period of time without impairing the sealing performance.

[Brief explanation of the drawing]

Figure 341 is a schematic diagram of the bearing device for the rotating shaft of the present invention, the second
The figure is the same cross-sectional view, Figure 3 is the m-III cross-sectional view of Figure 2,
Figure N4 is a sectional view taken along the line rV-rV in Figure 2. In the figure, 1 is a mixer, 4 is a housing, 8 is a rotating shaft,
9 and 10 are bearings, 17 is a propeller, 24 to 28 are V seals, 31 is a hydraulic chamber, 32 is a drain chamber, 35 is an air passage, 38 is a drain passage, and 39 is a wash water passage. Figure 1 Figure 3 j Figure 4

Claims (1)

[Claims] In a bearing device for a rotating shaft in which a rotating shaft is rotatably supported via a bearing in a housing provided at a lower part of a tank, a sealing member is arranged at a predetermined interval between the rotating shaft and the housing. A bearing device for a rotating shaft, characterized in that a hydraulic chamber is formed between the seal members and pressurized at a predetermined pressure to seal the bearing.