JPH03265767A - Shaft seal protective device - Google Patents

Abstract

PURPOSE:To prevent an invasion of impurities and furthermore to improve the exhausting effect by installing a screw type liquid cutter with a minute clearance to a groove process to which a rabyrinth screw is given, and rotating a stirring shaft and a stirring blade. CONSTITUTION:When a filling liquid in a stirring jar 1 is stirred by a driving device 4 and a stirring blade 2, substances invading through a clearance between the outer surface of a rabyrinth screw 11 and the inner surface of a screw type fluid cutter 10 pass at the upper side of the screw 11. In this case, the substances attached to the upper side by the rotation of the liquid cutter 10 are scraped off by a small radial groove 14, moved by the rotation of the liquid cutter 10 and a gas blow from a flashing nozzle 8, and pushed off to the outside. Furthermore, substances invading inside are going to invade to the lower side along a stirring shaft 5, but in this case, their invasion through the clearance is prevented by the upward lifting function of the invasion substances by utilizing the rotation of the stirring shaft 5 together with the rabyrinth 13 and a screw 12, and furthermore, a gas blow from the lower nozzle 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shaft seal protection device suitable for preventing foreign matter from entering the sleeve seal portion of a lower drive stirring device.

[Conventional technology]

The conventional device, for example, as shown in FIG.
The rotation of the stirring shaft 5 is intended to prevent liquid from entering. In this case, gas is injected from the flaving nozzle 8, but the gap 9 between it and the stirring shaft 5 is large, and the liquid drainer 7 does not have a discharge function that utilizes rotation, so the shaft sealing device 3 The amount of intrusion on the top surface was very large. Incidentally, related devices of this type include, for example, Japanese Patent Application Laid-Open No. 61-2
No. 66872 is mentioned.

[Problem to be solved by the invention]

In the conventional technology, the gap between the stirring shaft and the sleeve sealing seat is large, allowing liquid or powder to enter, so the amount of flapping was increased, but as a result, it was not able to function satisfactorily.

In addition, since the liquid drainer fixed to the stirring shaft is made of metal, it is necessary to increase the clearance to prevent accidents due to contact with the liquid stopper, which has the opposite effect on preventing liquid etc. from entering. Ta.

The purpose of the present invention is to reduce the gaps between each part to prevent foreign matter from entering, and to further improve the evacuation effect by rotating the labyrinth screw and the radially grooved disc part.

[Means for resolving issues]

In order to achieve the above object, two functions are added to the conventional technology.

First, a screw-type drainer made of resin material was installed so that it would rotate together with the stirring shaft.

That is, a labyrinth screw, which is welded to the main body of the stirring tank, is grooved, and the screw type drainer is attached to this. The rotation of the drive unit rotates the stirring shaft and stirring blades, and the liquid or powder in the stirring tank is stirred. In this case, liquid or powder enters through the gap and accumulates in the gap in the shaft seal. When the stirring shaft rotates, a small amount of gas, etc. is injected from the flubbing nozzle to gas-seal the threaded screw and labyrinth part, and the rotation of the stirring shaft is used to prevent liquid or powder that gets stuck in the screw function and invades the shaft sealing part. Push your body upwards.

Furthermore, the upper surface of the labyrinth screw is provided with a radial groove, and this groove maintains a small gap with the screw drain. Liquid or powder that has entered this part collects in the radial grooves, but is pushed out by the rotation of the screw-type drainer and the flow of flushing gas, which has the function of preventing liquid or powder from entering. .

[For production]

The screw-type liquid drainer uses a resin-based material so that it will not cause any problems even if it comes into contact with metal, thereby preventing accidents caused by contact. The labyrinth screw is welded to the main body, and a threaded screw with a correspondingly small gap is fixed to the stirrer shaft.This part has a screw function that is pushed upward by the rotation of the stirrer shaft, preventing intruding objects. do.

Furthermore, there are many radial grooves machined on the upper surface of the labyrinth screw, so if the liquid or powder in the tank enters through the gap between the liquid cutter and the liquid cutter, when gas is blown from the flushing nozzle, The gas flows through the radial grooves with low resistance, and the rotation of the stirring shaft brings the liquid or powder accumulated on the top surface of the labyrinth screw into these grooves.
It is pushed inside the tank by the gas flow. Thus, the present invention has a dual protection device.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 3 shows the structure of the lower drive stirring device. The rotation of the driving device 4 rotates the stirring blades 2, and the liquid or powder in the stirring tank 1 is stirred. The pressure inside the stirring tank 1 is sealed by the shaft seal part [3, but the liquid or powder in the stirring tank 1 passes through the gap between the stirring shaft and the seat due to its own weight and accumulates on the shaft sealing device 3. This may cause the sealing device 3 to leak.

Figures 1 and 2 show a beautiful example of the present invention. First, stirring [1
labyrinth screw welded to -11, stirring shaft 5;
Labyrinth 13 that acts in the upward direction by the rotation of
Further, small radial arms 14 are machined on the flat part of the upper surface. The screw-type drainer 10 that rotates together with the stirring shaft 5 is made of, for example, a resin material,
A threaded screw D is machined on a portion corresponding to the shaft, and assembled into the labyrinth 13 of the labyrinth screwdriver -11. The screw type drainer 10 is assembled with the gap between it and the radial drain 14 as small as possible.

The liquid filled in the stirring tank l is transferred to the driving device 4. When stirring with the stirring blade 2, a screw-type liquid drainer 10. Labyrinth screw U and stirring shaft 5
The liquid or powder in the stirring tank 1 tends to enter the upper part of the shaft sealing device 3 through the gap and deposit thereon. In the present invention, this is discharged using the rotation of the stirring shaft, and the materials (liquid or powder, etc.) that have entered through the gap between the outer surface of the labyrinth screw H and the inner surface of the screw type drainer 10 are removed from the labyrinth screw. It passes through the top of Nuyu-11. At this time, as the screw-type drainer 10 rotates, objects adhering to the upper surface are scraped off in the direction of the arrow by the small radial arms 14. The objects that have fallen into the stream 14 are moved in the direction of the arrow and pushed out by the rotation of the screw drainer 10 and the gas blowing from the flubbing nozzle 8. Furthermore, the objects that have entered the inside try to penetrate downward through the stirring shaft 5. in this case,
Due to the screw ratio of the labyrinth 13 of the labyrinth screw 11 welded to the cypress wood and the thread screw ratio of the screw drainer 10, the rotation of the stirring shaft 5 is used to push the intruding materials upward, and the flubbing nozzle at the bottom By blowing gas from 8, it prevents it from entering through the gap. In this way, the double structure can prevent the seed contents from entering the shaft sealing device.

〔Effect of the invention〕

According to the present invention, the gaps between the various parts are smaller than in the prior art, and it is possible to prevent foreign matter from entering the shaft sealing device. In addition, because the amount of gas flapping is reduced and the discharge function is doubled, the function as a bottom-driven stirring device is greatly improved, and long-term continuous operation is possible.
It also has the effect of being able to withstand this.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an embodiment of the shaft seal protection device according to the present invention, Fig. 2 is a top view of a labyrinth screw, Fig. 3 is a schematic diagram of a lower drive stirring device, and Fig. 4 is a conventional shaft seal protection device. It is a longitudinal cross-sectional view of a seal protection device. 1... Stirring tank, 2... Stirring blade, 3...
... Shaft sealing device, 4 ... Drive device, 5 ...
... Stirring shaft, 8 ... Flavsing nozzle, 1
0...Screw type drainer, 11...
Labyrinth screw, main...Screw screw 7
・

Claims (1)

[Claims] 1. In the lower drive stirring device, a screw-type liquid drainer equipped with a threaded screw is fixed to the stirring shaft connected to the shaft sealing device, and a labyrinth screw having a labyrinth that engages with the screw is connected to the screw-type liquid drainer and a microscopic liquid drainer. 1. A shaft seal protection device, which is fixed to the bottom of a tank while maintaining a clearance, has a radial groove on the upper surface of the labyrinth screw, and has a flushing nozzle opened at the bottom of the stirring shaft.