JPH0947647A - Flow plate rotating type mixing and defoaming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the film effect and increase the deaeration chance for vacuum defoaming and also improve the agitation effect for a lower liquid reservoir and also improve the pumping-up capability by a screw pump in a pumping-up tube. SOLUTION: A screw pump 7 is installed in a pumping-up tube 6 set vertically on the center of a vacuum tank 15, and an umbrella-shaped flow plate 3 is fixed on the periphery of an upper end section of the pumping-up tube 6, and the pumping-up tube 6 is rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow plate rotating type mixing and defoaming device for mixing and defoaming liquid high viscosity substances such as synthetic resin and ceramics.

[0002]

2. Description of the Related Art When processing a high-viscosity substance such as a synthetic resin or a ceramic, considering the casting of the synthetic resin in the process, it is often necessary to perform strong mixing and degassing. Especially in the case of synthetic resins, the mixing action often serves to evenly distribute the filler in the synthetic resin. Further, the viscosity of the mixture to be adjusted can be designed in detail so as to correspond to a relatively wide range, so that the application range is wide.

Therefore, in the conventional vacuum defoaming apparatus, only one step of the liquid flow plate is provided at the upper end of the pumping pipe which is erected at the center of the vacuum chamber and which spreads like an umbrella toward the side wall of the surrounding vacuum chamber. In general, the thin film flow forming time required for thin film defoaming cannot be taken sufficiently, so that it is the actual situation that pumping must be repeated. Therefore, as a result, it takes a long time for defoaming, the efficiency is poor, and improvement of this is required, and the force of sucking with a screw pump from the lower end of the pump and pumping it into the pump is weak. There is also a problem that if the viscosity of the liquid is low, the liquid cannot be pumped up to the required height.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and enhances the thin film effect and increases the degassing chance for vacuum degassing, and at the same time, lower liquid. It is an object of the present invention to provide a flow plate rotating type mixing and defoaming device capable of improving the stirring effect of a reservoir and improving the pumping capacity by a screw pump in a pump.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a screw pump is provided in a cylindrical pumping pipe provided vertically to the center of a vacuum chamber, and an umbrella-shaped flow plate is provided around the upper end of the pumping pipe. It consists of a flow plate rotating type mixing and defoaming device that is provided with a rotation drive mechanism that rotates the pumping pipe that fixes the flow plate.
After the liquid reaches the upper end of the pumping pipe, it flows down by overflow while diffusing the flowing liquid plate spreading like an umbrella toward the surrounding vacuum chamber side wall, and by the rotating umbrella-like flowing liquid plate, The thinning of the liquid is promoted and the defoaming efficiency can be enhanced.

Further, in the above apparatus, it is preferable that the rotation direction of the screw pump is opposite to the rotation direction of the pumping pipe in order to increase the pumping capacity,
In addition, an auxiliary stirring blade may be attached to the lower end of the pumping pipe, or a stirring blade may be attached to the lower part of the screw pump. It is desirable because the stirring effect in (1) and the liquid can be forcibly introduced into the pumping pipe.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing an embodiment of a flow plate rotating type mixing and defoaming apparatus of the present invention. 2 is a plan view of the essential parts showing the behavior of the liquid on the umbrella-shaped flow plate of the apparatus of FIG. 1 and the rotating direction of the flow plate, and FIG. 3 is a plan view of the flow plate of the apparatus of FIG. It is a principal part side sectional view which shows the structure which the liquid flows down by overflow.

First, in the apparatus shown in FIG. 1, a screw pump 7 is provided in a cylindrical pumping pipe 6 provided vertically to the center of a vacuum tank 15 for mixing and defoaming a synthetic resin having a raw material inlet 13 in the upper portion. And an umbrella-shaped flow plate 3 is fixed around the upper end of the pumping pipe 6. Further, rotary drive mechanisms 2 and 8 for rotating the pumping pipe 6 to which the flow plate 3 is fixed by the motor 1 are provided.

Further, the rotational direction S of the screw pump 7 shown in FIG. 3 is set to be opposite to the rotational direction R of the pumping pipe 6 via the rotary drive mechanisms 2 and 8. Further, an auxiliary stirring blade 9 is attached to the lower end portion of the pumping pipe 6, which rotates in the rotation direction R together with the pumping pipe 6,
On the other hand, a stirring blade 10 is provided below the screw pump 7.
Is attached, which rotates in the rotation direction S together with the screw pump 7.

Next, after the raw material liquid is introduced from the raw material inlet 13 of the vacuum tank 15 of the apparatus of this embodiment, the vacuum tank 15 is evacuated and the screw pump 7 is rotated by the motor 1 to rotate the rotary drive mechanism 2. The liquid is raised in the pumping pipe 6 by rotating the liquid through the flow path, and is made to flow down on the umbrella-shaped flowing liquid 3 toward the side wall of the vacuum tank 15 by overflow. At that time, since the screw pump 7 and the umbrella-shaped flow plate 3 are rotated in reverse, respectively, the pumping efficiency is increased, and a thin film can be easily and surely formed on the flow plate 3, and the defoaming efficiency is improved. Will be increased.

In order to rotate the screw pump 7 and the pumping pipe 6 in opposite directions, as shown in FIGS. 1 and 3, the rotation by the motor 1 is transmitted through the rotation drive mechanisms 2 and 8. It is done by. Also, the vacuum tank 15
For the liquid collected in the lower part of the inside, the stirring blade 10 attached to the screw pump 7 rotates simultaneously with the screw pump 7, while the auxiliary stirring blade 9 attached to the lower end of the pumping pipe 6 moves in the opposite direction. As it rotates, the liquid is effectively stirred and mixed, which helps the defoaming action and
The liquid is easily introduced into the screw pump 7.

Further, referring to the behavior of the liquid on the rotating umbrella-shaped flow plate 3 in FIG. 2, the liquid on the flow plate 3 is indicated by the arrow as a result of the rotation of the flow plate 3 indicated by the arrow R. It can be understood that the speed is increased like F to make a turn while flowing down. This will help thin the liquid under vacuum,
Substantially the same effect as that of increasing the area of the flow plate 3 can be obtained, and very efficient defoaming is possible. The liquid after mixing and defoaming is discharged to the outside from the discharge port 14 provided in the lower portion of the vacuum chamber 15 via the discharge valve 16.

[0013]

As described above, the following effects can be obtained by the flow plate rotating type mixing and defoaming apparatus of the present invention. 1. The thin film formation, which was insufficient in the conventional device with only one umbrella-shaped flow plate, facilitates thin film formation by rotating the umbrella-shaped flow plate, and allows the liquid to flow down on the flow plate. The speed can be increased and an efficient defoaming effect can be obtained. 2. The auxiliary stirring blade attached to the lower part of the pump can improve the effect of stirring the liquid, improve the effect of sucking the liquid into the screw pump, and increase the height of the pump. 3. Further, the stirring blade attached to the screw pump rotates in the direction opposite to that of the auxiliary stirring blade, whereby the liquid mixing and defoaming effects can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view according to an embodiment of a flowing liquid rotary type mixing and defoaming apparatus of the present invention.

FIG. 2 is a plan view of relevant parts showing the behavior of the liquid on the flow plate and the rotation direction of the flow plate of the apparatus of FIG.

FIG. 3 is a side sectional view of an essential part showing a structure in which a liquid flows down on a liquid flow plate of the apparatus of FIG. 1 by overflow.

[Explanation of symbols]

 3 Flow Plate 6 Pumping Pipe 7 Screw Pump 9 Auxiliary Stirring Blade 10 Stirring Blade 15 Vacuum Tank R Rotating Direction S Rotating Direction

Claims (4)

[Claims] 1. A screw pump is provided in a cylindrical pumping pipe provided vertically to the center of a vacuum chamber, and an umbrella-shaped flow plate is fixed around the upper end of the pumping pipe, and the pumping pipe is provided. Rotating flow plate rotating type mixing and defoaming device. 2. The flow plate rotating type mixing and defoaming device according to claim 1, wherein the rotation direction of the screw pump is opposite to the rotation direction of the pumping pipe. 3. The flow plate rotating type mixing and defoaming device according to claim 1, wherein an auxiliary stirring blade is attached to the lower end of the pumping pipe. 4. The flow plate rotating type mixing and defoaming device according to claim 1, 2 or 3, wherein a stirring blade is attached to the lower part of the screw pump.