JP2851536B2 - Stirrer sealing mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing mechanism for a stirrer, and more particularly to a method for uniformly mixing and stirring raw materials of a powder or a solid-liquid mixed phase in which a substance is dispersed in a liquid phase dispersion medium. For the purpose of finally obtaining a dry powder by evaporating the dispersion medium, it is rotated and revolved with the rotating shaft having spiral wings along the inner wall surface in an inverted conical closed container and stirred. The present invention relates to a sealing mechanism for a stirrer of the type described below.

[0002]

2. Description of the Related Art As a stirrer of the type described above, for example, there is known a granule drying apparatus (see Japanese Utility Model Laid-Open No. 1-94892) shown in FIG. In the figure, a rotating shaft 23 having a spiral blade 22 is provided along the inner peripheral wall surface of an inverted conical closed container 21. The rotating shaft 23 is rotatably supported at a tip box 25 of a hollow revolving shaft 24 extending in a radial direction from an upper portion of the center in the container, at an angle to the hollow revolving shaft 24 and in a posture along the inner peripheral wall surface of the container. . The revolving of the rotating shaft 23 is performed by rotating the hollow revolving shaft 24 around the center axis 28 by a revolving motor 26 and a revolving speed reducer 27 on the outside of the container. The rotation of the rotation shaft 23 is performed by rotating the rotation motor 29 and rotation reduction gear 30 on the outside of the container in the hollow revolution shaft 24.
This is performed by a transmission mechanism in which a horizontal driving belt 33 connects a driving pulley 31 at a lower end of a central shaft 28 and a passive pulley 32 at an upper end of a rotating shaft 23 to be driven. Note that a sprocket / chain drive system or a gear drive system may be adopted as the rotation drive system of the rotating shaft 23.

[0003] Reference numeral 34 denotes a jacket through which a heating medium passes for heating the material in the container. Further, the spiral blade 22 of the rotating shaft 23 is formed as a hollow blade in order to increase the heat transfer efficiency, and a circulation flow path of the heat medium is formed therein. A flow path for the heat medium communicating with the path is formed. As means for supplying and discharging the heat medium to and from the rotating shaft 23, a rotary joint 35 is provided above the rotation speed reducer 30, and external supply and discharge pipes 36 a and 36 b are connected to the rotary joint 35. Pipe supply / discharge pipe 37
Is connected to a manifold 38 in the hollow revolving shaft 24, branched from the manifold 38 into an inflow pipe 39 a and an outflow pipe 39 b, connected to a rotary joint 40 above the rotary shaft 23, and connected to a heat transfer medium above the rotary shaft 23 from the rotary joint 40. It is configured so as to communicate with the flow path.

According to the granule drying apparatus configured as described above, the drying of the granules is effectively performed by receiving heat from the heat transfer surface of the spiral blade, so that the drying efficiency is high. The effect of shortening the drying time and preventing the heat treatment of the granular material from being altered is obtained.

[0005] Incidentally, in such a granular material drying apparatus, when the target granular material is changed, the inside must be cleaned. In this case, it is necessary to provide an appropriate seal mechanism in the rotation drive unit of its own revolution in order to prevent intrusion of a cleaning liquid such as water or a solvent. In this regard, as a conventional sealing mechanism, a method of providing an oil seal, a lip seal, or the like has been generally used. However, this sealing method can prevent the intrusion of the granular material, but cannot prevent the infiltration of the liquid. Therefore, when cleaning the container, the cleaning liquid is supplied to the lower surface of the hollow revolving shaft 24 or less. , And it is not possible to wash the entire container in one operation. Therefore, in order to remove the powder particles attached to the hollow revolving shaft 24, there is an annoyance that an operator must enter the container and perform cleaning.

As another sealing mechanism, a method of providing a gland packing is also known, but this sealing method lacks reliability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a seal mechanism for a stirrer capable of reliably preventing liquid from entering by a simple mechanism. Is to provide.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a revolving motor and a rotation motor on the outside of an inverted conical closed container, and to arrange the motor along the inner peripheral wall surface of the container. The upper end of the rotating shaft having the spiral blades arranged in the container is pivotally supported on the tip of the hollow revolving shaft which extends in the radial direction from the upper portion of the center in the container and turns around the hollow center shaft by the revolving motor. A sealing mechanism for a stirrer having a rotating shaft configured to be able to revolve and rotate by the revolving motor and the revolving motor, wherein the skirt is supplied with a compressed gas body for preventing infiltration of liquid into the pivot portion. Part, the lower end of the skirt part is horizontal to the liquid surface, and the pressure of the compressed gas supplied from the outside is set within at least the lower end of the skirt part within the stirring device within a range not exceeding 0.3 kg / cm ² . Filled liquid level The pressure is determined by adding the pressure loss of the compressed gas supply path to the water head pressure at, and the compressed gas at this pressure passes through the inside of the hollow central shaft and reaches the skirt through the inside of the hollow revolution shaft. It is a feature of the seal mechanism of the stirring device.

As the gas body, air is the cheapest, but an inert gas such as nitrogen gas can also be used.

[0010]

[Function] The lower end of the skirt provided on the pivot of the revolving and rotating shaft and the hollow revolving shaft is horizontal to the liquid surface,
By supplying a compressed gas body having an appropriate pressure not exceeding 0.3 kg / cm ² to the skirt portion, even if the container is filled with liquid, the sealing member such as an oil seal is not damaged. It is possible to surely prevent the liquid from revolving and revolving, and from the lower end of the skirt to enter the pivot.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, a revolving motor 3 (0.4 kw) with a speed reducer 2 and a rotation motor 5 (3.7 kw) with a speed reducer 4 are installed on the outside of the inverted conical closed container 1.

A rotary shaft 7 having spiral blades 6 is provided along the inner peripheral wall surface of the container, and the upper end of the rotary shaft 7 is attached to the tip of a hollow revolving shaft 8 extending in the radial direction from the upper portion of the center in the container. It is rotatably supported. The revolution of the rotating shaft 7 is controlled by the reduction gear 2
The rotation is performed by rotating the hollow revolving shaft 8 about the hollow central shaft 9 by the revolving motor 3.

A bevel gear 12a formed at the end of the connection shaft 11 is engaged with a bevel gear 10 formed at the end of the hollow central shaft 9 rotated by the rotation motor 5 with the speed reducer 4, and the other end of the connection shaft 11 is engaged. Bevel gear 12 formed at the end
A bevel gear 13 formed at the upper end of the rotating shaft 7 is engaged with b. Thus, the rotation of the rotating shaft 7 is performed by connecting the hollow center shaft 9 rotated by the rotating motor 5 with the speed reducer 4 to the rotating shaft 7 by the above-described bevel gear system.

The details of the connection between the upper end of the rotating shaft 7 and the tip of the hollow revolving shaft 8 are shown in an enlarged manner in FIG. 2 and will be further described with reference to FIG. In FIG. 2, reference numeral 14 denotes a lip seal, 15 denotes an oil seal, and a lower end of the bevel gear box 16 is provided with a skirt portion 17 formed by cutting a cylinder obliquely. This is in accordance with the inclination angle of the rotating shaft 7 because it is inclined. As a result, the lower end of the skirt portion 17 becomes horizontal with respect to the liquid surface.

Further, in FIG. 1, an air supply pipe 20 for supplying compressed air is connected to the upper rotary joint 19 of the speed reducer 4. The compressed air supplied to the air supply pipe 20 passes through the inside of the hollow center shaft 9, passes through the inside of the hollow revolution shaft 8, and flows to the skirt portion 17 according to the path shown by the arrow in FIG. Reach.

In FIG. 1, the lower part of the container is omitted, but this part is substantially the same as that of FIG. The capacity of the stirrer of this embodiment thus configured is 1 m ³ , the diameter D is 1.7 m, the total height H ₂ is 3.7 m, and the height H ₁ from the lower end of the device to the upper surface of the hollow revolving shaft is ₂ m 2. 0.5 m.

Next, water is applied to the upper surface of the hollow revolving shaft 8 while flowing 0.2 kg / cm ² of air through the compressed air path of the agitating device, and the system is operated for about 1 hour. The sealability of the was investigated. In order to investigate the sealing property, a method was applied in which blotting paper was pasted on the inner surface of the skirt portion 17 in advance, and after the operation, whether or not the blotting paper was wet was examined. As a result, it was visually checked that the blotting paper was not wet after the operation was completed, and it was confirmed that the present sealing mechanism was an effective means for preventing water from entering.

The pressure of the air supplied from the air supply pipe 20 is equal to the water head pressure (the height from the skirt to the upper surface of the water filled in the container, which is 0.5 m in this embodiment). The pressure to which the pressure loss in the feed path (approximately 0.05 kg / cm ² ) is applied should be the lowest value. Accordingly, in this embodiment, head pressure 0.05 kg / cm ² + pressure loss of the air delivery path ^{0.05kg / cm 2 = 0.1kg / cm} 2 is the lowest value. In order to maintain the sealing performance, it is preferable that the pressure is high. On the other hand, if the pressure is too high, the oil seal may be damaged. Therefore, the upper limit is set at 0.3 kg in consideration of the pressure resistance of the oil seal. / Cm ² is preferred.

[0019]

According to the present invention, a skirt for supplying a compressed gas body is provided at the liquid inlet, and the lower end of the skirt is horizontal with respect to the liquid surface.
By supplying a compressed gas body having an appropriate pressure not exceeding 3 kg / cm ² , even when the container is filled with liquid, it revolves and rotates without damaging sealing members such as oil seals, and skirts. It is possible to reliably prevent liquid from entering the inside of the machine from the lower end.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a main part of a stirring device having a sealing mechanism of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a vertical sectional side view of a conventional granular material drying apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Closed container 2, 4 ... Reduction gear 3 ... Revolution motor 5 ... Rotation motor 6 ... Spiral blade 7 ... Rotating shaft 8 ... Hollow revolving shaft 9 ... Hollow center shaft 17 ... Skirt part

Continuation of the front page (72) Inventor Tadanari Yamazaki 2-13-1834 Kawasaki-cho, Akashi-shi, Hyogo (56) References JP-A-60-197227 (JP, A) JP-A-51-111954 (JP, A) Kaihei 5-63634 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B01F 7/00-7/32, 15/00

Claims (1)

(57) [Claims] 1. A revolving motor and a rotation motor are arranged on the outside of an inverted conical closed container, and the upper end of a rotating shaft having spiral blades disposed along the inner peripheral wall surface of the container is placed inside the container. , Which is radially extended from the upper part of the center and pivotally supported by the revolving motor at the distal end of the hollow revolving shaft which rotates around the hollow central axis, and is configured to be revolvable and revolvable by the revolving motor and the revolving motor. A seal mechanism of a stirring device having a rotating shaft, provided with a skirt portion to which a compressed gas body for preventing infiltration of liquid is supplied to the pivot portion,
Make the lower end of the skirt part horizontal to the liquid surface, and
The pressure of the supplied compressed gas exceeds 0.3 kg / cm ²
Within the agitator from at least the lower end of the skirt
Head pressure up to the liquid level filled with gas
The pressure equal to the pressure loss is applied, and the compressed gas
Scar passes through the inside of the hollow center axis, passes through the inside of the hollow revolution axis
The sealing mechanism of the stirrer, characterized in that the sealing mechanism is reached .