JPS6349243A - Stirrer - Google Patents

Abstract

PURPOSE:To permit efficient stirring with a stirrer requiring stirring in a vacuum or under pressurization by driving a stirring means directly by a motor and sealing the motor hermetically into a motor chamber which constitutes a stirring tank. CONSTITUTION:After a prescribed raw material is charged from a raw material charging port 37, a pump is driven to pressurize the inside of a stirring chamber to a prescribed pressure. The pressure in the motor chamber 12 is also increased to the same pressure but the pressure exerted to the part of a packing 29 for sealing the lower part is only the head pressure of the liquid contained in the motor chamber 12. The stirring chamber 11 and the motor chamber 12 are thoroughly hermetically sealed. Stirring vanes 13 rotate when the motor 14 is rotationally driven. There is the case in which the liquid leaks from the part of the packing 29 for sealing a partition wall 16 and enters the inside of the stirring chamber 11 in the lower part, but the liquid is a liquid or solvent having no influence on the raw materials; therefore there are no troubles even if the liquid is incorporated into the raw materials.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a stirring device for liquids and liquids, liquids and solids, and particularly to a stirring device that requires stirring under vacuum or pressure.

[Conventional technology]

When the pressure inside the stirring tank is different from atmospheric pressure, such as a vacuum or a high pressure state, conventional stirring devices install an electric motor outside the stirring tank and move stirring tools such as stirring blades inside the stirring tank. It was rotated by a drive shaft that penetrated the wall. A mechanical seal or magnetic fluid seal was applied to the portion where the drive shaft penetrated the tank wall.

Various types of stirring devices have also been developed that do not have a drive shaft that penetrates the tank wall. For example, there are devices in which a permanent magnet is placed inside the stirring tank and an appropriate magnetic field is applied from outside the tank to drive it to rotate. A stirring cylinder corresponding to the rotor of an electric motor is installed in the
There was one in which an S wire corresponding to the stator of an electric motor was provided outside the stirring tank to rotate the stirring cylinder inside.

(Problems to be Solved by the Invention) However, in most stirring devices having a drive shaft that penetrates the tank wall, the stirring shaft is cantilevered, which may cause the shaft to shake and cause the seal to fail. Particularly in the case of mechanical seals, there is a problem in that lubricating oil or bacteria may enter the tank due to oil leakage.

Also, if you use a magnetic fluid seal, it will evaporate, so
There was a problem in that it was difficult to use at high temperatures of 80° C. or higher or in vacuum.

In the above-mentioned stirring device that applies an appropriate magnetic field to the outside of the stirring tank to rotate a stirring cylinder or the like disposed inside the stirring tank, there is a tank wall and an appropriate gap between the negative side and the secondary side. Therefore, there was a problem that the efficiency was lower than that of a normal electric motor.

Furthermore, when metal is used for the tank, there is a problem in that eddy currents flow due to changes in magnetic flux, which further reduces efficiency.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stirring bag surface that prevents foreign matter from being mixed into the raw material to be stirred under vacuum or pressure and has high stirring efficiency.

[Means to solve problems]

The stirring device according to the present invention, which achieves the above object, includes a stirring tank that can be closed, a stirring chamber in which raw materials are introduced and stirred, and an electric motor that rotates a stirring tool in the stirring chamber via a drive shaft. A motor chamber is divided into a motor chamber, and the motor chamber is filled with a solvent used for stirring or a liquid that can be mixed with the raw materials, and the pressure in the space between the stirring chamber and the motor chamber is approximately constant. It consists of:

Here, it is preferable that the electric motor consists of a trapped-type multipolar induction motor, and that its rated frequency is lower than the commercial frequency, and that the fixed winding of the electric motor is made of Teflon-based material that is resistant to chemicals and heat. Alternatively, it is preferable to use ceramic insulated wires and to connect the windings of each phase that can be used in the liquid outside the tank.

[Function] In the stirring device according to the present invention, a hermetically sealed stirring tank is divided into a stirring chamber and a motor chamber, and the stirring tool in the stirring chamber is connected to the electric motor via a drive shaft. Therefore, the drive shaft passes through the wall that partitions the stirring chamber and the motor room through an appropriate sealing means, but the motor room is filled with liquid that does not cause any problems even if it gets mixed into the solvent used for stirring or the raw materials to be stirred. Even if liquid leaks from the motor chamber into the stirring tank at the sealing means, the stirring operation will not be affected.

Moreover, since the pressure in the space between the stirring chamber and the motor chamber is approximately constant, the amount of liquid flowing through the sealing means due to the pressure difference is extremely small.

〔Example〕

Next, an embodiment embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention.

Here, FIG. 1 is a side sectional view of a stirring device according to an embodiment of the present invention.

As shown in FIG. 1, the stirring device IO according to an embodiment of the present invention includes a stirring chamber 11 constituting a lower stirring tank, a motor chamber 12 constituting an upper stirring tank, and a stirring chamber 11 disposed inside the stirring chamber 11. A stirring blade 13, which is an example of an i-push tool, an induction motor 14 disposed in a motor chamber 12, and a drive shaft 15 connecting the induction motor (hereinafter referred to as a motor) 14 and the stirring blade 13. , and its auxiliary equipment. below,
These will be explained in detail.

The stirring chamber 11 constituting the upper stirring tank and the motor chamber 12 constituting the lower stirring tank are divided by a partition wall 6.
The stirring chamber 11 and the motor chamber 12 are corrosion-resistant pressure vessels having a structure that can withstand a predetermined pressure or vacuum.

A discharge valve 17 is provided at the bottom of the stirring chamber 11,
The stirring chamber 11 has a structure in which the raw material that has been completely stirred can be discharged, and the entire stirring chamber 11 is mounted on a pedestal 18.

The electric motor 14 disposed in the electric motor room 12 is a dual-type electric motor, and its core and windings are subjected to corrosion-resistant treatment. That is, the windings of the motor are made of Teflon or ceramic insulated wires, the core is anti-corrosion plated or painted, and the surface of the rotor 19 is coated with anti-corrosion material.

The motor shaft 20 and the motor casing 21 are made of stainless steel, and the bearings 22 and 23 are made of a ceramic or carbon material that can be used in liquid and does not corrode. The windings of the stator 24 of the motor 14 are not connected inside the motor room 12, and the winding start and end of each phase are all pulled out outside the tank and connected at a terminal 25 provided outside the tank. .

The electric motor 14 is a multi-polar (usually 8 or more poles) electric motor, and its driving power source is driven at a frequency lower than the commercial frequency.
A stirring blade is rotated at the bottom at a rotation rate of about 200 to 40 Orpm. The reason why the electric motor rotates at such a low speed is that it is extremely difficult to manufacture a reducer that can be used in a vacuum or in any liquid, and even if it were manufactured, foreign substances would be generated due to wear of the reducer. This is because there are vibrations that enter the stirring chamber, and furthermore, it is possible to obtain the specified rotational speed and rotational force by using an electric motor with a low rated frequency and a large number of poles without using a reducer. It is.

The shaft 20 of the electric motor 14 and the drive shaft I5 of the stirring blade 13 are connected by a cuff ring 27 for contact pressure.

The shaft 20 is also rotatably supported by a bearing 28 fixed on the partition wall 16, and a sealing gasket 29 is provided on the upper part of the bearing 28.
2 and the stirring chamber 11.

A small dog 30 is attached to the shaft 20, and the liquid in the motor chamber 12 is circulated to cool the motor 14 and the bearings.

A M31 that can be opened and closed is attached to the upper part of the electric motor chamber 12, and a detector 32 for detecting the liquid level in the electric motor chamber 12 and a replenishment tank 3'3 for the liquid are attached to the lid 31. . This liquid is the same liquid as the liquid filled in the motor chamber 12, and is used for the raw material to be stirred in the stirring chamber 11, or a liquid that does not affect the raw material even if purchased.

Stop pulps 34 and 35 are connected to the upper and lower parts of the replenishment tank 33, and the motor chamber 12 and the motor chamber 12 are connected to stop pulps 34 and 35.
and a pressure equalizing pipe 36 connecting the stirring chamber 11 and the stirring chamber 11, respectively. The other end of the pressure equalizing pipe 36 is connected to a pump (not shown), so that the interior of the stirring chamber 11 and the motor chamber 12 can be vacuumed or pressurized to a predetermined pressure.

In addition, a raw material input port 37 and an inspection port 38 are provided at the upper side of the stirring chamber 11, and in the figure, 40 indicates raw materials (solid and liquid or liquid and other liquid), and 41 indicates the electric motor chamber 12. Indicates the liquid filled inside.

Next, regarding the operation of the stirring device 10 according to the above embodiment,
It will be explained in more detail.

First, after inputting a predetermined raw material from the raw material input port 37, a pump (not shown) is driven to bring the inside of the stirring chamber 11 to a predetermined pressure. At this time, the pressure inside the motor chamber 12 becomes the same, but the pressure applied to the lower sealing gasket 29 is only the head pressure of the liquid contained in the motor chamber 12.

It is assumed that the stirring chamber 11 and the motor chamber 12 are completely sealed.

Next, when the electric motor 14 is driven to rotate, the stirring blade 13 starts to rotate, but after repeated use, liquid leaks from the sealing gasket 29 of the partition wall 16, causing the stirring chamber Il in the lower part to leak.
Even in this case, there is no particular problem because cough fluid is a liquid or solvent that has no effect even if mixed into the raw material.

On the other hand, when the liquid moves to the lower part, the amount of liquid in the upper motor chamber 12 decreases, so this is detected by the detector 32, and the lower stop valve 34 is opened to the required level to drain the liquid from the replenishment tank 33. refill.

This control can be performed automatically, or it can be performed manually since the amount of liquid leaking to the bottom is extremely small.

The raw material stirred in this way is discharged through the lower discharge valve 1.
It is discharged by opening 7.

The motor chamber 12 is provided with a water jacket structure 39, and has a structure that allows the heat accompanying the rotation of the motor to be transferred to the liquid circulating inside and then released to the outside.

〔Effect of the invention〕

As is clear from the above description, in the stirring device according to the present invention, since the stirring tool is directly driven by an electric motor, it is possible to stir efficiently.

In addition, since the electric motor is sealed and placed inside the electric motor chamber that makes up the stirring tank, unlike the conventional case where the electric motor is placed outside, there is no leakage from the bearings, and it can be used in a vacuum or under pressure. Stirring is now possible.

The motor chamber where the electric motor is installed is separate from the stirring chamber, but the motor chamber is filled with a solvent for the raw materials or a liquid that does not cause any problems even if mixed into the raw materials, so there is no risk of leakage at the bearings. However, there is no problem with stirring work.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a stirring device according to an embodiment of the present invention. [Explanation of symbols] 10...--stirring device, 11...-i push chamber, 12--
--・Electric motor room, 13-1111・Stirring blade, 111
-------Electric motor, 15------One drive shaft, 16
----------Bulkhead, 17...---Discharge valve, 1
8・-・-・-frame,

Claims (3)

[Claims] (1) A hermetically sealed stirring tank is divided into a stirring chamber in which raw materials are introduced and stirred, and a motor chamber in which a motor is installed to rotate the stirring tool in the stirring chamber via a drive shaft, and the electric motor is A stirring device characterized in that a chamber is filled with a liquid that can be mixed with the solvent or raw material used for stirring, and the pressure in the space between the stirring chamber and the motor chamber is kept approximately constant. . (2) The stirring device according to claim 1, wherein the electric motor is a cage-type multipolar induction motor, and its rated frequency is lower than the commercial frequency. (3) For the fixed windings of the motor, chemical- and heat-resistant Teflon or ceramic insulated wires are used.
2. The stirring device according to claim 1, wherein the windings of each phase that can be used in the liquid are connected outside the tank.