JPS5810617B2 - Jikufuusouchi - Google Patents

Description

[Detailed Description of the Invention] This invention is based on the magnetic elasticity of a unit in which a magnetic material is set as a labyrinth seal that seals the atmosphere inside the tank to the outside air with respect to the stirring shaft, etc. facing the inside of the tank in a chemical reaction tank, etc. This relates to a system in which the labyrinth system is made as narrow as possible to make it work effectively, and in particular, it is possible to reliably obtain the labyrinth effect by skillfully configuring the array set of magnetic materials. This relates to what has been done.

Conventionally, in chemical reaction tanks, etc., the rotating shaft is exposed to the inside for the purpose of promoting the reaction and ensuring uniform reaction, but it is essential to seal the rotating shaft between the internal atmosphere and the outside air. This is a mechanical condition.

For example, if toxic gas is generated during the reaction, the conditions become particularly severe.

To deal with this, various sealing means such as mechanical seals, oil seals, labyrinth seals, etc. have been devised and adopted.

However, in each of those sealing means = length -
It was short, and it was a definite decision.

For example, with mechanical seals, wear on the sliding surfaces is unavoidable along with friction, so it is natural that they must be replaced after a certain period of time, in which case toxic gas may be generated or the remaining tank may be damaged. It has the drawback that it is extremely dangerous to go inside with a protector installed to perform replacement work, and
There were problems with heat generation and frictional resistance during operation, and process control problems.

Furthermore, oil seals have the disadvantage of oil leakage into the tank, while conventional labyrinth seals have operational advantages such as the fact that little load is placed on the seal and generated gas can be washed away with clean gas. Although this has the merits, the forming part of the labyrinth system path requires high-precision machining, which not only has the disadvantage that it is difficult to work during the molding process, but also makes it difficult to design the fine system path when combining labyrinth units. It had the disadvantage that skill was required to form it.

The purpose of this invention is to eliminate the above-mentioned drawbacks by combining an extremely simple labyrinth unit with a device that only sets a magnetic material, in view of the problems associated with the sealing of the rotating shaft that faces the reaction tank, etc. Therefore, we would like to provide a new shaft sealing device that solves the difficulties, eliminates disadvantages, can be assembled in force dynamically, performs labyrinth action efficiently during operation, and reliably obtains the desired shaft sealing effect. It is something to do.

In accordance with the above object, the present invention has a structure in which a plurality of ring-shaped units are mounted on a rotating shaft facing into a tank such as a chemical reaction tank so as to be movable by a minute amount in the axial direction. A plurality of units are provided so as to be movable by a minute amount in the axial direction, and both ends of both units are fixed in a combination relationship such that the polarities of the magnetic bodies set in each unit are the same and opposite to each other. The labyrinth system path formed by each unit is automatically formed with as small a gap as possible by the opposing magnetoelasticity of the magnetic body of each unit, and the internal atmosphere is exhausted to the outside of the system through the labyrinth system path. The gist of this is that it has been done in such a way that it is

Next, embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes, for example, a tank casing of a chemical reaction tank, and a rotating shaft 3 connected to a coupling 2 faces inside the casing 1.

Reference numeral 4 denotes a shaft sealing device interposed between the rotary shaft 3 and the casing 1, and a cleaning air supply duct 5 and an exhaust duct 6 are attached to the upper part of the casing 1 on the outside thereof.

A sleeve 7 is fixed to the rotating shaft 3 by suitable means such as a key, and an outer flange 8 is provided at the lower end.

A unit 10, a spacer ring 11, and a collar 12 protrude from below to the collar 9 with respect to the flange 8.
A unit 13 protruding from the sleeve 7 and a unit 15 protruding from the collar 14 are respectively mounted on shafts with a minute gap α therebetween, and the upper collar 14 is fixed to the sleeve 7 at a designed position.

On the other hand, an outer cylindrical casing 16 faces the sleeve 7.
is adapted to be appropriately fixed to the casing 1,
Its lower end is provided with an inner flange 11, the flange 1
A unit 19 projects upward from 7 into the ring 18, a spacer 20, and a unit 26 projects into a ring 23 having an air supply port 21 on one side and an exhaust port 22 on the other side, with a minute gap α interposed therebetween as described above. are arranged in a layered manner.

Note that the upper ring 25 is fixed to the cylindrical casing 16 by screws or other means.

Further, the ring 23 is appropriately positioned in the axial direction so that its air supply port 21 and exhaust port 22 are connected to the air supply duct 5 and exhaust duct 6.

In addition, depending on the design, spacer ring 11 and spacer 2
0 does not need to be provided.

Each unit is provided with a permanent ferromagnetic material 27 of the same Gauss so that the opposing polarities of adjacent units are the same as shown in the figure.

28 is an O-ring. In installing the shaft sealing device having the above structure, first insert the ring into the outer cylindrical casing 16, then insert the collar 9 into the sleeve 7, then conversely insert the spacer 20, and then insert the ring 23 into the outer cylindrical casing 1.
6, then the collar 12 is mounted on the sleeve 7 again via the spacer ring 11, then the ring 25 is positioned above the outer cylindrical casing 16, and finally the collar 14 is mounted on the sleeve 7. When the upper ring 25 and the collar 14 are pressed down from above using appropriate pressure means such as screw pressing, each unit is displaced through the designed gap α against the magnetoelasticity due to the opposite polarities of the magnetic bodies. The upper ring 25 and the collar 14 are fixed to the upper part of the outer cylindrical casing 16 and the sleeve 7, respectively. Ru.

Accordingly, a labyrinth line shown in the figure is formed in each unit by automatic adjustment in an extremely small gap, and communicates with the inside of the tank, and with the metering air supply duct 5 and exhaust duct 6. The unit mounted on the rotating shaft 3 is in a non-engaging relationship with the unit mounted on the outer cylindrical casing 16.

When the reaction tank is operated and the rotating shaft 3 is rotated, the gas generated in the reaction tank passes through the labyrinth system, connects to the air supply duct 5 and the exhaust duct 6, and is pumped out from the air supply duct 5. The cleaning air is discharged from the exhaust duct 6 to the outside of the system.

Therefore, toxic gases etc. in the tank are not directly released into the outside air.

As described above, according to the present invention, as a shaft sealing device for a rotating shaft inserted into a reaction tank or the like, magnetic bodies are provided in a plurality of units disposed alternately and axially displaceably on the rotating shaft and the outer casing, Furthermore, since the magnetic bodies are arranged so that they have the same polarity facing each other, by simply fixing the units on both sides, the other units can be completely automatically adjusted in displacement and automatically positioned with an even minute gap between them. Because it is possible to form a labyrinth system path in the mold, it is possible to form minute clearances that cannot be achieved by processing and forming.

In particular, by setting up multiple units, it is possible to make the designed labyrinth path smaller, for example.

Further, machining is not required, and once set, no maintenance is required for a semi-permanent period.Furthermore, since the structure is simple, manufacturing costs and running costs are low.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional explanatory view of the structure, and FIG. 2 is a partially enlarged explanatory view thereof. 3...Rotating shaft, 27...Magnetic material, 10
, 13° 15. 19, 24, 26... unit, 4... shaft sealing device, 16... casing.

Claims (1)

[Claims] 1. In a shaft sealing device in which a labyrinth system sealing internal fluid and outside air against a rotating shaft extending in the vertical direction is formed by a combination of units in which magnetic material is set, the unit is attached to the rotating shaft in the axial direction. It consists of a unit mounted on the shaft at variable positions on the shaft, and another unit mounted on the casing at variable positions on the rotating shaft, and the magnetic bodies set in these units have the same polarity facing each other. A shaft sealing device characterized in that the labyrinth path is polarized, and the labyrinth path is formed between the units and extends in the radial direction of the rotating shaft.