JP2008089074A - Gland box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gland box and gland packing which allow follow-up correction with respect to distortion, deformation and deviation amount of a shaft, reduce leakage amount and has enhanced durability. <P>SOLUTION: In a double packing box keeping two boxes fitted into each other in a spherical structure incorporating partition wall, the leakage is prevented by a gland box and gland packing in which one end is directed to the back and compressed air is inserted through the other end to be held. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

   The present invention relates to a gland box and a gland packing for the purpose of preventing outside air suction and dust leakage at the time of decompression at a portion where a stirring shaft used in a food residue drier passes through a dryer partition wall.

In the process of drying the food residue, if the residue housed in the dryer tank is heated from the outer periphery, the product temperature of the processed product rises and defies “Ganyari” and then becomes a large mass. It is necessary to break this lump and release moisture from the inside.
In order to destroy the processed material that is in the form of a lump, it is dried while being crushed by a stirring shaft, an arm fixed to the shaft, and a scraper at the tip of the arm.

Although it is often the case when the dryer is placed horizontally, the absolutely necessary stirring shaft penetrates the left and right end plate-side partition walls, and a bearing and a power transmission device are provided outside the drying tank.
The gland box is filled with gland packing as a structure that closes the gap between the bulkhead and the shaft, and if the internal pressure is high by the gland packing presser, leakage prevention was attempted. .

In particular, when the diameter and length of the dryer tank are long, the distance between the stirring shaft and the bearing core becomes long, and the shaft causes a jump rope phenomenon to stir a large amount of processed material. Wear out.
The deviation amount increases as the distance between the bearing and the dryer partition increases.
The ground is attached in contact with the partition wall and cannot follow the eccentricity of the shaft.

Grease seals and air seals are used as methods to reduce the amount of leakage from the gland, but heating and cooling are indispensable for the shaft of the food dryer, and the tank and shaft are deformed due to the welded structure. Get up constantly.
Even if the diameter of the tank body is increased and the processed material is supplied below the shaft, there is a problem that the powder leaks due to the processed material being scraped up by the stirring action.
In particular, when wind having wind pressure is blown into the drying chamber, dust blows off at the end of drying from the ground portion at the position opposite to the blowing side.


JP-A-9-170662 Shaft seal shaft seal structure Tamagawa Machinery Co., Ltd. Patent application title: Shaft seal structure of container-fixed mixer used for food processing

  The problem to be solved is that both the dryer tank body and the stirring shaft included are welded structures, and due to processing accuracy, deformation due to heating during drying, jumping of the rope of the shaft, and axial extension of the stirring shaft, Degradation and wear damage of the packing in the connected gland box occurred, resulting in insufficient durability of the gland packing.

    In the present invention, the packing for following the above-mentioned shaft thermal deformation and the support point for supporting the shaft by the gland packing in the gland box are made as close to the bearing as possible, and further a double packing box is provided to The fulcrum that supports the packing box is a spherical surface.

   Leakage of dry matter from the agitation shaft and shaft penetration is blocked by a labyrinth provided on the partition wall surface and a labyrinth fitted on the shaft, and the support position of the ground and the shaft is moved closer to the bearing with less unevenness, thereby reducing the unevenness of the shaft. In the structure to follow, the double packing box is supported by a sphere and the eccentricity of the gland packing is suppressed by covering the eccentricity of the shaft.

By providing a labyrinth on the inner surface of the dryer partition wall and the shaft penetrating part, it is possible to prevent the leakage of dust at the end of drying and to extend the replacement time of the packing due to wear by the gland packing that follows deformation due to heating.

The embodiment will be described with reference to FIG. Bulkhead of dryer tank body A bearing is provided on the outer side, and the bearing side is 16. A housing having a concave spherical flange structure is joined to the partition wall. In the housing taken out 13. 1. In the labyrinth room 3. Centering on the stirring axis 2. Fits to the partition labyrinth and shaft. The axial labyrinth prevents leakage of the processed material pushed out of the tank.

16. Concave spherical flange and 17. 12. Between convex spherical flanges. Insert curved packing to bring it into close contact, preventing leakage between spherical surfaces. To bring the spherical surfaces into close contact with each other9. Although the joining force is given by the flange joint bolt, if the joining force is excessively large, the spherical curved surface will not move and the follow-up to the shaft will become worse. Tighten with an elastic body.

17. A packing chamber is provided inside the convex spherical flange so that a part of the packing chamber and the upper half from the base of the convex spherical surface to the partition wall side can be removed. When replacing packing, see 9. 16. Remove flange coupling bolt Pull out the convex spherical flange to the bearing side and replace the packing except for the upper half.

The gland packing is tightened using a method employed in a conventional pump or the like.
5. Use a gland packing presser to prevent leakage.
If a packing box is provided near the bearing as long as it does not interfere with the packing replacement work, the amount of shaft deviation can be reduced.

The weak point of the gland packing structure is wear on the contact surface with the packing shaft. As the anti-friction material contained in the packing decreases, the capacity drops sharply.
Therefore, a wear-resistant material is baked on the outer peripheral half of the hollow rubber-based pipe, one end of the pipe is closed, and the pipe is wound around the shaft.

The opening of the hollow packing wound around the shaft is cut off the shaft side of the gland packing presser and taken out of the packing box.When a check valve is provided on the pipe and the air pressure is pushed in, the outer circumference winding of the elastic pipe is softly sealed. It is in close contact with the box, and the wear-resistant coating surface is pressed against the sleeve of the shaft by air pressure.

When the dryer is used, by repeating heating and cooling, it is possible to follow tank deformation such as internal stress deformation over time stress or shaft eccentricity.

It is explanatory drawing which showed the implementation method with sectional drawing of an axis | shaft, a gland box, and gland packing. Example 1

It is explanatory drawing which showed the implementation method which inserted air in the gland packing with the said sectional drawing. (Example 2) It is the external view which looked at sectional drawing of FIG. 2 from the gland packing presser side. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dryer tank partition 2 Stirring shaft 3 Axis labyrinth 4 Bulkhead labyrinth 5 Gland packing presser 6 Gland packing 7 Endless hollow gland packing 8 Elastic body 9 Flange coupling bolt 10 Packing tightening bolt 11 Shaft sleeve 12 Curved packing 13 Labyrinth chamber 14 Hollow packing Notch 15 Check valve 16 Concave spherical flange 17 Convex spherical flange 18 Split packing chamber

Claims (3)

The cylinder is joined to the outside of the tank from the stirring shaft penetrating partition, and the labyrinth provided on the partition surface and the labyrinth provided on the shaft are engaged inside the cylinder, and the concave spherical flange and the convex spherical flange are aligned with the cylindrical end. A gland packing box comprising a gland packing and a gland packing presser, in which an elastic body is sandwiched between spherical surfaces and an elastic body is sandwiched between the spherical surfaces and a packing chamber is provided inside the convex spherical flange.   The gland packing and the gland packing box according to claim 1, wherein the gland packing is reinforced with a wear-resistant elastic material on the outer peripheral half of the elastic hollow pipe.   3. The gland packing and gland packing box according to claim 2, wherein one end of the gland packing is completely closed, compressed air is inserted from the other end and the shaft is wound endlessly around the shaft.

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