JP2006289193A - Shaft seal device of kneading object agitator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance sealability by providing a shaft seal casing having a sealing part to an agitation tank body via an elastic plate, and absorbing shaft runout of an agitator shaft by the elasticity of the elastic plate. <P>SOLUTION: This shaft seal device of the kneading object agitator is composed to obtain stable sealbility by providing the shaft seal casing 5 having the sealing part 9 to the agitation tank body 1 via the elastic plate 3, and absorbing shaft runout of the agitator shaft 2 by the elasticity of the elastic plate 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shaft seal device for a kneaded product stirrer, and in particular, by attaching a shaft seal case having a seal part to the stirrer body through an elastic plate, the shaft runout of the stirring shaft is absorbed by the elasticity of the elastic plate, The present invention relates to a new improvement for improving the sealing performance.

Conventionally, as a shaft seal device of a stirrer for stirring this type of slurry-like kneaded material, for example, the configuration shown in FIG. 3 and the configuration shown in Patent Document 1 have been adopted.
In the configuration shown in FIG. 3, what is indicated by reference numeral 1 is a stirring tank body, and the outer surface 1a of the stirring tank body 1 has a cylindrical shape as a whole and has a seal 9 such as a gland packing. The case 5 is fixed by bolts 5a.

  The seal part 9 is held by a pressing ring 5b so as not to protrude outward. A stirring shaft 2 is rotatably provided inside the seal part 9, and the stirring shaft 2 is provided inside the stirring tank body 1. The agitating blade (not shown) is rotated.

  Further, in the shaft seal device of the mixer disclosed in the above-mentioned Patent Document 1, the size of the gap between the gland packing and the stirring shaft is detected by the detection means as the size of the pressure value, and the detected value corresponds to the detected value. This is a configuration using a pressing force control means for adjusting the pressing force with a pressing means using a compressed fluid.

JP 2003-190755 A

Since the conventional shaft seal device of a kneaded product agitator is configured as described above, the following problems exist.
That is, in the shaft seal device of the gland packing system shown in FIG. 3, since the shaft seal case and the stirring vessel body are completely fixed, the shaft seal case does not follow the shaft runout of the stirring shaft. The contact surface pressure between the packing and the stirring shaft becomes non-uniform, and the shaft seal performance is greatly reduced. That is, the nonuniformity of the contact surface pressure causes a breathing phenomenon, making it easy for the kneaded material to enter the shaft seal portion, and wear of the stirring shaft is extremely short-lived.
Further, in the configuration as disclosed in Patent Document 1, a method of always automatically adjusting the clearance of the seal portion with respect to the shaft run-out is employed. However, an extra gland packing pressing force control device and compressed air are required, and the shaft The structure of the sealing device was also complicated. Even with this method, when a breathing phenomenon such as shaft runout occurred, the shaft was worn out quickly.

  A shaft seal device for a kneaded product agitator according to the present invention includes a stirrer body of a stirrer that stirs a slurry-like kneaded material, a shaft seal case having a sealing part connected to the stirrer body through an elastic plate, A stirring shaft held in the shaft seal case, a guide bar provided in the shaft seal case and having a hole, and a pin provided in the stirring tank body and engaged with the hole, and the shaft runout of the stirring shaft is While absorbing by the elasticity of the elastic plate, a gap is formed between the pin and the inner wall of the hole, and an elastic plate fixing ring is provided on the inner surface of the elastic plate, and the elastic plate Is configured to be sandwiched between the stirring vessel body and the elastic plate fixing ring, and a collar is provided on the outer periphery of the stirring shaft, and the collar is disposed between the stirring shaft and the seal component. The color is a configuration in which a detachable from the stirring shaft.

Since the shaft seal device of the kneaded material stirrer according to the present invention is configured as described above, the following effects can be obtained.
That is, since the shaft seal case having the seal part provided with the stirring shaft is attached to the main body of the stirring tank via the elastic plate, the shaft shake of the stirring shaft can be absorbed by the elasticity of the elastic plate, The sliding surface pressure with the agitation shaft can be maintained uniformly and stably for a long time, the sealing performance is greatly improved, and the shaft sealing device can be constructed with a simple structure.

  The present invention provides a kneaded product in which a shaft seal case having a seal part is attached to a stirring tank main body via an elastic plate so that the shaft runout of the stirring shaft is absorbed by the elasticity of the elastic plate to improve the sealing performance. An object is to provide a shaft seal device for a stirrer.

Hereinafter, preferred embodiments of a shaft seal device for a kneaded product stirrer according to the present invention will be described with reference to the drawings.
Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals.
What is indicated by reference numeral 1 in FIG. 1 is a stirrer main body of a stirrer that stirs the slurry-like kneaded product. An opening 1A of the stirrer main body 1 is provided with a shaft hole 2A for allowing the stirrer shaft 2 to pass therethrough. And an elastic plate 3 having elasticity such as a rubber plate is provided, and an elastic plate fixing ring 4 and a shaft seal case cover 8 are attached to the inner surface of the elastic plate 3, and the elastic plate 3 and the elastic plate fixing ring 4 are It is being fixed to the inner wall 1a of the said stirring tank main body 1 with the volt | bolt 5a.

On the outer surface 3 b of the elastic plate 3, a ring-shaped shaft seal case 5 is coaxially disposed at the outer peripheral position of the stirring shaft 2, and in this shaft seal case 5, a seal component made of a gland packing or the like. 9 is installed through a backup ring 10, and both ends thereof are covered with a shaft seal case cover 8.
Accordingly, the agitation shaft 2 is sealed by the seal component 9.

  In the vicinity of the opening 1A of the outer wall 1b of the stirring tank body 1, a pair of pins 7 projecting toward the outer wall 1b of the stirring tank body 1 are provided. The longitudinal direction of the pins 7 is the axis of the stirring shaft 2 It arrange | positions so that it may become parallel to a direction.

  A pair of guide bars 6 are provided on the outer peripheral surface of the shaft seal case 5 along a direction perpendicular to the axial direction of the agitation shaft 2, and are formed on the tip side of each guide bar 6. The pin 7 is engaged in the hole 11 in a penetrating state, and a gap is formed between the pin 7 and the hole inner wall 11 a of the hole 11.

In the above-described structure, when the shaft shake of the stirring shaft 2 occurs, the shaft seal case 5 can move following the shaft shake of the stirring shaft 2 due to the contraction of the elastic plate 3.
In addition, since the hole 11 that allows the radial displacement of the guide bar 6 attached to the shaft seal case 5 against the twist of the elastic plate 3 due to the rotation of the stirring shaft 2 is provided, the stirring shaft Abnormal deformation due to torsion of the elastic plate 3 can be prevented without impairing the absorption of the axial vibration of 2.
Accordingly, the sliding surface between the seal component 9 and the stirring shaft 2 can maintain the contact surface pressure uniformly and stably over a long period of time, so that the sealing performance can be greatly improved.

FIG. 2 shows another embodiment. A narrow diameter portion 2a is formed on the stirring shaft 2, and a cylindrical collar 12 is detachably attached to the small diameter portion 2a. When the material is caught and worn between them, the collar 12 can be repaired only by replacement.
In addition, the same code | symbol is attached | subjected to the same part as FIG. 1, and the description is abbreviate | omitted.

  The present invention is not limited to a stirrer and can be applied to other rotating devices.

It is a section lineblock diagram showing a shaft seal device of a kneaded material stirrer by the present invention. It is a cross-sectional block diagram which shows the other form of FIG. It is a cross-sectional block diagram of a conventional configuration.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stirring tank main body 1a Inner wall 1b Outer wall 2 Stirring shaft 2A Shaft hole 2a Thin diameter part 3a Inner surface 3b Outer surface 3 Elastic plate 4 Elastic plate fixing ring 5 Shaft seal case 5a Bolt 5b Holding ring 6 Guide bar 7 Pin 8 Shaft seal case cover 9 Seal part 10 Backup ring 11 Hole 12 Color

Claims (3)

  A stirrer tank body (1) of a stirrer for stirring the slurry-like kneaded product, and a shaft seal case (5) having a seal part (9) connected to the stirrer tank body (1) via an elastic plate (3) A stirring shaft (2) held by the shaft seal case (5), a guide bar (6) provided in the shaft seal case (5) and having a hole (11), and the stirring tank body (1) And a pin (7) that engages with the hole (11) and absorbs the shaft runout of the stirring shaft (2) by the elasticity of the elastic plate (3), and the pin (7) and the hole A shaft seal device for a kneaded product stirrer, wherein a gap is formed between the inner wall (11a) of (11).   An elastic plate fixing ring (4) is provided on the inner surface (3a) of the elastic plate (3), and the elastic plate (3) is sandwiched between the stirring vessel body (1) and the elastic plate fixing ring (4). The shaft seal device for a kneaded product stirrer according to claim 1.   A collar (12) is provided on the outer periphery of the stirring shaft (2), and the collar (12) is disposed between the stirring shaft (2) and the seal component (9), and the collar (12) The shaft seal device for a kneaded product stirrer according to claim 1 or 2, wherein the shaft is configured to be detachable from the stirring shaft (2).

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