JPS6240214Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a shaft sealing device that seals the penetration part of a rotating shaft passing through a tank body, and in particular, the present invention relates to a shaft sealing device that seals the penetration part of a rotating shaft passing through a tank body. Sealing is normally achieved by passing a sealing fluid between the seal plate and the sheet member, and when the sealing fluid is not used, the fluid inside the tank is The present invention relates to a shaft sealing device in which a sheet member is brought into close contact with a sealing plate by pressure for sealing.

[Conventional technology]

The smoke atomizer (air blowing device) installed in the air oxidation tank of the wet desulfurization equipment is equipped with a shaft sealing device to seal the penetration part of the rotating shaft that passes through the bottom of the oxidation tank. This prevents the absorption liquid inside from leaking. That is, as shown in FIG. 1, the smoke atomizer 2 provided at the bottom of the oxidation tank 1 has a blind flange 3 provided at the bottom opening of the oxidation tank 1 to close it. A rotary shaft 4 is provided in the center of the rotary shaft 4, which vertically passes through the center, and is rotatably provided via a gland packing 5. A disk-shaped rotor 6 is attached to the upper end of the rotating shaft 4, and a large number of pins 7 are provided radially on the outer peripheral edge of the rotor 6. Cylindrical stator 8 with a small gap on the outer periphery
is provided. Further, a nozzle 10 is connected to the blind flange 3 for supplying compressed air into a stator box 9 partitioned by the stator 8 and the rotor 6, and a nozzle 10 is connected to the lower end of the rotating shaft 4 to drive the nozzle to rotate. No rotating device is connected.

Reference numeral 11 denotes a bearing that supports the rotating shaft 4 outside the tank body. When the compressed air supplied into the stator box 9 passes through a small gap between the outer circumference of the rotor 6 rotating via the rotating shaft 4 and the upper end of the stator 8, it is compressed by the pin 7 on the rotor 6. divided,
The oxidation tank 1 is formed into minute bubbles that rise inside the oxidation tank 1, and air oxidizes the sulfite, which is an absorption liquid filled in the tank.

In the conventional smoke atomizer 2, compressed air is passed through a small gap between the outer circumference of the rotor 6 and the upper end of the stator 8 at a high flow rate, and the gland packing 5 rotates the smoke atomizer 2. I was performing a shaft seal on shaft 4.

[Problem that the invention attempts to solve]

However, even if the compressed air is passed through the minute gap at a high flow rate, it is inevitable that the absorbent liquid will flow down the inner wall of the stator 8, and the absorbent liquid that has flowed into the stator box 9 will pass through the gland packing 5. It may pass through and leak out of the tank, causing damage to the rotating shaft 4 or bearing 11 due to solid particles in the absorption liquid.
There was a problem that the viscous absorbent liquid contaminated the surrounding area.

Therefore, the present invention was devised to solve these problems, and its purpose is to reliably seal the shaft of the tank penetrating part, and prevent damage to the rotating shaft, bearings, etc. due to liquid leakage. An object of the present invention is to provide a shaft sealing device that can prevent contamination.

[Means for solving problems]

In order to achieve the above object, the present invention provides a device for sealing the penetration part of a rotary shaft rotatably provided through a tank body containing fluid, in which the rotary shaft is inserted into the penetration part of the tank body. A gland packing for sealing between a boss part surrounding and extending into the tank body and a rotating shaft provided on the inner peripheral part of the boss part, and fixed to the rotating shaft inside the tank body from the boss part. a cylindrical collar member whose inner side of the tank body is closed and covers the boss portion; an annular seal plate extending radially inward from the inner circumferential wall of the collar member and formed in multiple stages in the axial direction; an annular flexible sheet member provided on the outer circumferential wall of the boss portion in surface contact with the outer surface of each of the seal plates extending radially outward therefrom; and a seal formed along the boss portion; A sealing fluid supply passage for supplying a sealing fluid into the collar member.

[Effect]

A gland seal seals between a boss provided on the tank body and the rotating shaft, and a collar member provided on the rotating shaft so as to surround the boss and the boss come into sliding contact with each other. A seal is provided by a multi-stage seal plate and a sheet member. The space between the multi-stage seal plate and the seat member is sealed by jetting sealing fluid from inside the collar member, and when sealing fluid is not supplied, the seat member is sealed by the pressure of the fluid contained in the tank body. is sealed by being brought into close contact with the seal plate.

〔Example〕

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In FIGS. 2 and 3, 2 is a smoke atomizer provided at the bottom of the oxidation tank, and if explained by assigning the same reference numerals to the same parts as those described above, it closes the opening at the bottom of the oxidation tank. Blind flange 3
A cylindrical boss portion 12 is integrally provided at a portion through which the rotating shaft 4 passes through, surrounding the rotating shaft and extending into the tank body, that is, the stator box 9. The boss portion 12 is formed as a packing box, and a gland packing 5 for sealing between the boss portion 12 and the rotating shaft 4 is provided on the inner peripheral portion. 13 is the ground. Further, an annular flexible sheet member 1 is provided on the outer circumferential wall of the boss portion 12 facing the inside of the tank so as to extend outward in the radial direction.
4 are provided at appropriate intervals in the axial direction.
This sheet member 14 is made of, for example, a rubber sheet, and its free outer edge 14a is brought into surface contact with a sealing plate 15, which will be described later, to exhibit a sealing function.

On the other hand, a cylindrical collar member 16 whose upper end is closed is provided on the rotating shaft 4 on the inner side of the tank body than the boss portion 12 so as to cover the boss portion 12 . The inner circumferential wall 16a of the collar member 16 opposes the outer circumferential wall of the boss portion 12 with a predetermined gap, and the inner circumferential wall 16a has an annular seal plate 15 extending radially inward from the inner circumferential wall 16a. are integrally provided in multiple stages at appropriate intervals in the axial direction. The relationship between these seal plates 15 and the sheet member 14 is such that the outer edge portion 14a of the sheet member 14 is in surface contact with the outer surface, ie, the lower surface, of the corresponding seal plate 15. Therefore, the pressure inside the tank, in this case,
The pressure of the compressed air or the absorption liquid flowing into the stator box 9 presses the sheet member 14 onto the seal plate 15 and brings it into close contact with the seal plate 15, so that the space between the boss portion 12 and the rotating shaft 4 can be sealed.

A sealing fluid supply passage 17 for supplying sealing fluid from outside the tank body into the collar member 16 is formed in the boss portion 12, and the sealing fluid is supplied from between the seal plate 15 and the sheet member 14. By letting the water flow out, a seal is created between them. Note that water or oxidizing air (compressed air) can be used as the sealing fluid.

Next, the operation of the above embodiment will be described.

The smoke atomizer 2 is operated by rotating the rotary shaft 4 while supplying compressed air from a nozzle 10 into the stator box 9, so that the rotor 6 and the stator 8 are rotated to oxidize the absorbing liquid in the tank.
The collar member 16 constituting the shaft seal device of the present invention rotates together with the rotating shaft 4, and seals the rotating shaft penetration part formed in the tank body between the seal plate 15 formed on the collar member 16 and the seat member 14 provided on the boss part 12, which is the fixed side. That is, during normal operation, sealing is performed by supplying a sealing fluid such as water into the collar member through the sealing fluid supply passage 17, and the sealing fluid supplied into the collar member 16 presses down the seal member 14 and passes between the seat member 14 and the seal plate 15 of the collar member 16, thereby preventing leakage of the stored liquid (absorption liquid) in the oxidation tank. The sealing fluid that reaches the lower end of the collar member 16 passes over the lower end and enters the stator box 9, and is introduced into the oxidation tank together with the compressed air. This sealing method is as follows:
In particular, even when the rotary shaft 4 is rotating, the seal plate 1
Since there is little sliding friction between the stator box 9 and the seat member 14, wear of the seat member 14 can be prevented. On the other hand, the shaft seal device of the present invention can perform its sealing function even without supplying a sealing fluid. In this case, the pressure of the compressed air in the stator box 9 or the absorbing liquid that has flowed into the stator box 9 acts on the seat member 14, causing it to adhere to the seal plate 15, thereby reliably preventing leakage of fluid inside the tank. Also, this sealing method is suitable when the rotation of the rotating shaft 4 is stopped. Thus, the combination of the boss portion 12 and the collar member 16 forms an inverted U-shaped through-hole in the tank body for the rotating shaft 4.
A U-shaped passage is formed, and a seal portion consisting of a seal plate 15 and a sheet member 14 is provided at the front and rear of the passage, and a gland packing 5 is provided at the rear of the passage. This prevents the absorbent from reaching the gland packing 5, and reliably prevents leakage to the outside of the tank body.
Since these are in surface contact, even if they are eccentric, this does not impair the sealing performance, and further, even if they are out of level, this can be absorbed by the flexibility of the sheet member 14.

In addition, in order to improve the sealing performance, the seal plate 1
5 are preferably arranged in multiple stages with small intervals, but in this case, the sheet member 14 may make surface contact with the lower seal plate 15, making it difficult to circulate the sealing fluid. As a means for preventing this, it is preferable to provide unevenness on the lower surface of the sheet member 14 or the upper surface of the seal plate 15 to avoid surface contact.

Although the above embodiments have been described with reference to an oxidation tank, the present invention is not limited thereto.

[Effect of idea]

In summary, the present invention exhibits the following excellent effects.

(1) Seal between the boss part provided on the tank body and the rotating shaft with a gland packing, and seal between the boss part and a collar member provided on the rotating shaft so as to surround the boss part. Since sealing is performed by multiple stages of seal plates and sheet members that are in sliding contact with each other, the shaft seal of the tank body penetrating portion is multilayered, and the sealing performance can be significantly improved.

(2) Therefore, when the present invention is adopted in a smoke atomizer for an oxidation tank, leakage of the absorption liquid can be reliably prevented, and damage and contamination of the rotating shaft, bearings, etc. can be prevented.

(3) Since the seal plate and the sheet member are in surface contact and the sheet member is flexible, there is a possibility that the seal plate and the sheet member are eccentric or out of level. Even if the sealing performance is high, the sealing performance can be maintained at a high level.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional structure, FIG. 2 is a side view showing an embodiment of the present invention, and FIG. 3 is an enlarged sectional view of the same essential part. In the figure, 4 is the rotation axis, 5 is the gland packing, 1
2 is a boss portion, 14 is a sheet member, 15 is a sealing plate, 16 is a collar member, and 17 is a sealing fluid supply passage.

Claims (1)

[Scope of utility model registration request] In a device for sealing a penetration part of a rotary shaft rotatably provided through a tank body containing a fluid, a boss extends from the penetration part of the tank body into the tank body while surrounding the rotation shaft. and a gland packing provided on the inner periphery of the boss part for sealing between the rotary shaft and the inner side of the tank fixed to the rotary shaft inside the tank body from the boss part to cover the boss part. a cylindrical collar member; an annular seal plate extending radially inward from the inner circumferential wall of the collar member and formed in multiple stages in the axial direction; and an annular seal plate extending radially outward from the outer circumferential wall of the boss portion. an annular flexible sheet member provided in surface contact with the outer surface of each of the seal plates extending in the direction; and an annular flexible sheet member formed along the boss portion for supplying sealing fluid into the collar member. A shaft seal device characterized by comprising a sealing fluid supply passage.