JP2003148631A - Shaft seal device for glass lining can agitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft seal device for glass lining can agitator with a simple structure, which keeps sealing performance high over a long term and never causing can internal contamination. SOLUTION: A staffing box 2 is provided on the can body nozzle 52 of a glass lining can 50, and a segment seal 2 is connected to the staffing box 1. The staffing box 1 comprises a bushing 10, and the segment seal 2 constitutes form sealing surfaces S1 and S2 with a segment ring 20 and a segment ring 21. Further, inert gas is blown through an inert gas injection port 35, and an inert gas flow from the staffing box 1 toward the direction of the can inside Y is formed to seal the can inside Y.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a shaft sealing device for a glass lined can agitator.

[0002]

2. Description of the Related Art A glass lining can 50 handles a highly corrosive fluid, and a glass lining is applied to the inside thereof to prevent corrosion of the can itself. The glass lining can 50 is equipped with a stirrer, and the rotary shaft of the stirrer penetrates from the outside to the inside of the glass lining can 50.
The sealing between the rotary shaft and the glass lining can 50 has been conventionally performed by injecting grease into the gland packing. In addition, a mechanical seal was attached and sealed.

[0003]

However, in the case of the gland packing, there are problems such as deterioration of sealing property due to wear, necessity of retightening, and contamination of the inside of the can by abrasion powder. Further, there are problems that the inside of the can is contaminated by the grease injection, the environment is contaminated due to the leakage of the grease to the atmosphere, the equipment is dirty, the maintenance is complicated, and the equipment for supplying and discharging the grease is required. Further, there is a problem that a water cooling device is required to remove frictional heat between the gland packing and the rotating shaft. On the other hand, the mechanical seal has a complicated structure and is expensive, requires a sealing liquid, and there is a risk of contamination of the can by the sealing liquid. Further, there is a problem that it is necessary to suppress the shake of the shaft of the stirrer and the movement in the thrust direction, and further cooling water is required. The present invention aims to solve the above problems of the prior art.

[0004]

In order to achieve the above object, the shaft sealing device for a glass lined can agitator of the present invention comprises:
A stuffing box equipped with a corrosion-resistant bushing that is attached to a can body nozzle of a glass lining can and is installed around a shaft for a stirrer that extends from the can body nozzle, and the stuffing box is provided on the atmospheric side of the stuffing box A segment seal having a plurality of segment rings attached around the periphery of the segment seal, and an inert gas inlet for injecting an inert gas into the segment seal and flowing the inert gas from the segment seal toward the stuffing box. , Is provided. With the above structure, it is possible to perform a seal with a simple structure without the risk of contamination in the can and with easy maintenance. Further, the bushing also has a function of preventing the shaft of the stirrer from swaying, thereby improving the sealing property. The segment seal includes two seal end faces, a seal end face inside the glass lining can and a seal end face on the atmosphere side, and at least two or more segment rings that contact the respective seal end faces to form a seal face. It is desirable to improve the sealing performance by performing the sealing on both the inside of the can and the atmosphere side. Further, by forming a gap between the corrosion resistant bushing and the shaft for allowing the inert gas to pass therethrough, the effect of preventing the fluid in the can from entering the seal portion can be improved. The segment ring is composed of multiple segments and can be divided into multiple pieces. The casing of the segment seal is divided into two parts, and the corrosion resistant bushing attached to the stuffing box is also divided into two parts. As a result, the entire shaft sealing device can be disassembled and installed without disassembling the stirrer.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, the structure of the glass lining can and its entire agitator will be described with reference to FIG. The glass lining can 50 is provided with a glass lining 51 inside, and a shaft J is inserted from a can body nozzle 52 on the upper side.
Internal stirring is performed by a propeller attached to the. The shaft J is sealed by a shaft sealing device A attached to the can body nozzle 52, and the bearing 60,
It is connected to a motor 63 via a coupling 61 and a speed reducer 62 and receives a rotational force. The bearing 60, the coupling 61, the speed reducer 62, and the motor 63 are supported by a mount 64.

The structure of the shaft sealing device A will be described with reference to FIGS. 1 and 2. The stuffing box 1 is mounted on the can body nozzle 52 of the glass lining can 50, and the segment seal 2 is further provided on the stuffing box 1.
The stuffing box 1 and the segment seal 2 form a shaft sealing device A.

The stuffing box 1 has a bushing 10 made of a corrosion-resistant resin, which is divided into two parts, and is installed inside the stuffing box 1. In order to pass an inert gas, which will be described later, between the bushing 10 and the shaft J. There is a slight gap between them. Bushing 10 and stuffing box 1
The space between and is sealed by a corrosion-resistant O-ring 11. Instead of the O-ring 11, a corrosion resistant liquid packing or the like may be used. The inner wall of the stuffing box 1 is provided with a glass lining 12 on the entire surface or on the lower half of the can body nozzle 52 side to prevent corrosion inside the stuffing box 1. The packing 13 seals between the end of the can body nozzle 52 and the end.

The segment seal 2 is provided with a pair of segment rings 20 and a pair of segment rings 21, and is configured to perform sealing at two locations on the inside Y side of the glass lining can 50 and the atmosphere X side. ing. The segment seal 2 has three casing rings 22, 23 and 24.
It is equipped with two casings, each of which is divided into two parts, and a liquid packing is applied to the joint surface to be integrated. The casing ring 22 and the casing ring 24 have an inner circumference that is close to the outer circumference of the shaft J, while the casing ring 23 has a large inner diameter and is provided with an annular projection 30 that is close to the outer circumference of the shaft J in the center. Thus, the seal chamber 31 and the seal chamber 32 are formed between the shaft J and the outer periphery thereof.

The segment rings 20 and 21 are segment rings of a normal segment seal, and have a ring shape composed of a plurality of segments, and the inner peripheral surface of the ring is in contact with the outer peripheral surface of the shaft J or It is designed to seal in a non-contact state. Each segment ring 2
0 is formed of two rings, and their end faces are in contact with each other to form a seal between the rings.

Springs 33, 33 are mounted on the protrusion 30, and the springs 33, 33 press the segment ring 20 against the casing ring 22, respectively.
In addition, the segment ring 21 is pressed against the casing ring 24 to be sealed. That is, the end surface of the segment ring 20 is pressed against the end surface 220 of the casing ring 22 as shown in FIG.
1, the end surface of the segment ring 21 is pressed against the end surface 240 of the casing ring 24 to form the sealing surface S2.
Is formed. The protrusion 30 also has detents 34, 34
Is attached to prevent the segment rings 20 and 21 from rotating.

An inert gas injection port 35 is formed in the casing ring 23, and the inner peripheral surfaces of the segment rings 20 and 21 and the shaft J are fed from an inert gas injection device (not shown).
Inert gas is blown between the outer peripheral surface and the outer peripheral surface. The inert gas is set to have a slightly higher pressure than the inside Y of the can, and forms a flow of the inert gas from the inner circumference of the segment ring 20 through the inner circumference of the bushing 10 toward the inside Y of the can.

The flow of the inert gas ensures the sealing with the inside Y of the can. Further, the inert gas also forms a flow in the X direction on the atmosphere side to seal the inflow of the atmosphere.

In the shaft sealing device A having the structure described above, the shaft J can be effectively sealed by the stuffing box 1, the segment seal 2, and the inert gas blown from the inert gas inlet 35. Further, since the stuffing box 1 and the segment seal 2 are not in contact with the shaft J or are in slight contact with the shaft J, wear is small and stable sealing can be performed for a long time.

Further, since the inert gas flows into the inside Y of the can, the product is not contaminated. Further, the segment seal 2 has a small sliding heat generation, and thus a cooling device or a cooling water pipe is not necessary. Further, it is not necessary to supply grease or seal liquid, and the device is simple.

As in the above embodiment, the bushing 10 and the segment seal 2 of the stuffing box 1 are used.
By dividing into two parts, it is possible to install, disassemble, and install the shaft sealing device A without disassembling the stirrer, and shorten the time for maintenance work and reduce the cost. Will be possible.

[0016]

As described above, according to the shaft-sealing device for a glass-lined can agitator of the present invention, efficient and long-term shaft-sealing is possible without causing contamination in the can, and the device is simple. Moreover, there is an effect that maintenance is easy.

[Brief description of drawings]

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

2 is a partially enlarged sectional view of FIG.

FIG. 3 is a schematic diagram showing the entire glass lined can agitator.

[Explanation of symbols]

1: Stuffing box, 2: Segment seal,
10: bushing, 11: O-ring, 12: glass lining, 13: packing, 20: segment ring, 2
1: segment ring, 22: casing ring, 2
3: casing ring, 24: casing ring, 3
0: protrusion, 31: seal chamber, 32: seal chamber, 33: spring, 34: rotation stop, 35: inert gas injection port,
50: Glass lining can, 51: Glass lining,
52: Can body nozzle, 60: Bearing, 61: Coupling, 62: Reduction gear, 63: Motor, 64: Frame, 22
0: end face, 240: end face.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Keisuke Nagata             Stock Exchange, 3-14-15 Yaguchi, Ota-ku, Tokyo             Company Tanken seal ginger (72) Inventor Hiroyuki Sakuraba             Sumitomo Chemical, Misawa City, Aomori Prefecture             Industry Co., Ltd. (72) Inventor Takahiro Komatsu             Sumitomo Chemical, Misawa City, Aomori Prefecture             Industry Co., Ltd. F-term (reference) 3J042 AA03 AA13 BA03 CA15 DA09

Claims (4)

[Claims] 1. A stuffing box equipped with a corrosion resistant bushing, which is mounted on a can body nozzle of a glass lined can and is installed around a shaft for a stirrer extending from the can body nozzle, and an stuffing box on the atmosphere side of the stuffing box. A segment seal having a plurality of segment rings provided around the shaft and an inert gas for injecting an inert gas into the segment seal and flowing the inert gas from the segment seal toward the stuffing box. A shaft sealing device for a glass lined can agitator, which is provided with an active gas inlet. 2. The segment seal comprises two seal end surfaces, a seal end surface inside the glass lining can and a seal end surface on the atmosphere side, and at least two or more segments that contact the respective seal end surfaces to form a seal surface. The shaft sealing device for a glass lined can agitator according to claim 1, further comprising a ring. 3. The shaft sealing device for a glass lined can agitator according to claim 1, wherein the corrosion resistant bushing forms a gap between the shaft and the shaft for allowing the inert gas to pass therethrough. 4. The shaft sealing device for a glass lined can agitator according to claim 1, wherein the segment seal has a plurality of divided piece structures.