JPS62152526A - Fluid stirring apparatus - Google Patents

Abstract

PURPOSE:To smoothly stir a fluid, in a fluid stirring apparatus mounted to a hermetically closed space of a fluid to be stirred, by mounting a stirring blade to the drive shaft of a motor wherein only the winding of a stator is received in a hermetically closed container and pivotally supporting the drive shaft by a high temp. and high humidity resistant bearing. CONSTITUTION:A motor 1 has a stator iron core 10 and a coil 11 is mounted to one end of said motor 1. The coil 11 is covered with a hermetically closed box 10 made of stainless steel and blocked from a high temp. and high humidity atmosphere. A drive shaft 120 extends to a vertical direction through the rotor 12 positioned in opposed relation to the coil and is supported by bearings 3, 3 at both end parts thereof and stirring blades 2 are mounted to the upper part of said drive shaft 120. Each bearing 3 is different from a general pivot bearing. That is, a plurality of balls 31 are placed on a semispherical receiving tray 30 and a single ball 31 is further placed on said balls 31 and engaged with the groove 121 formed to the leading end part of the drive shaft 120 to support said shaft 120. The receiving tray and the balls are manufactured from material quality having high corrosion resistance and high abrasion resistance (e.g., carbon) to enable non oil supply.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for stirring a fluid such as gas or liquid in a closed space.

[Prior Art] There are cases in which it is necessary to stir a fluid under increased pressure or reduced pressure, or under high temperature. Examples include reaction tanks used in composite material production, autoclaves, rubber vulcanizate heat treatment tanks, electric furnaces, heat treatment furnaces, culture tanks, and the like.

In these closed spaces such as tanks and furnaces, stirring is performed in order to rapidly equalize the distribution of temperature and humidity and to promote the reaction of the reaction fluid.

A device that performs this stirring is usually equipped with a power source such as an electric motor outside the closed space, and a rotating shaft is passed through the partition wall of the closed space, and stirring is carried out by attaching stirring blades or the like inside the space. There is.

[Problems to be Solved by the Invention] However, in the conventional stirring device described above, since the rotating shaft penetrates the partition wall of the closed space, there is a problem that the rotating shaft of the shell passage portion must be sealed. there were. This seal is usually achieved by shaft sealing devices such as mechanical seals, labyrinth seals, oil seals, and gland paragins, but as is well known, these shaft sealing devices cannot always completely prevent leakage. When the temperature inside the container is high and the pressure is high, or when the stirring blade rotates quickly, the sealing performance cannot be maintained sufficiently, resulting in a problem that the reliability of the device is significantly reduced.

Furthermore, when double mechanical seals are used, accidents have occurred in which the lubricating and cooling oil inside the seal leaks and comes into contact with the high temperature, high pressure fluid in the container and spontaneously ignites.

For this reason, in the past, even when stirring was required, sufficient stirring was not performed, and although it is advantageous to perform stirring as in high-temperature, high-pressure steam curing cans for aerated concrete, in reality, it is not possible to do so in containers. There were many areas where internal stirring operations were not performed.

Therefore, if a device that can reliably stir without leakage or fire accidents under conditions such as high temperature and high pressure could be developed, its industrial applicability would be extremely large. .

[Means for Solving the Problems] The present invention has been developed based on the above-mentioned viewpoints, and there is no need to provide a rotating shaft in the closed space of the fluid to be stirred, and it can be reliably used in high temperature and high pressure closed spaces. The object of the present invention is to provide a stirring device that can perform stirring.

For this purpose, the present invention provides a fluid stirring device installed in a closed space of a 1゛γ fluid to be stirred, in which a motor in which only the stator winding is housed in a sealed container is interstaged, and the drive shaft of the motor is The stirring blade is removed, and the drive shaft is supported by a high-temperature and high-humidity bearing, which is basically internally cooled.

With this configuration, the inside of the closed space can be reliably stirred without passing the rotating shaft through the closed space.

[Example] An example of the present invention will be described below based on the drawings. X is a closed space such as a tank or a furnace, and A is a stirring device.

Although the closed space X is assumed to be a rectangular parallelepiped for convenience, it may have any shape, such as a donut shape.

The stirring device is composed of a motor 1, stirring blades 2, and bearings 3. As shown in FIG. 2, the motor 1 has a stator core 10 in the shape of an opening, and a coil 11 is attached to the negative side of the stator core 10. This coil 11 is covered with a stainless steel airtight box 110 and is isolated from the high temperature and humid atmosphere in the space X. There are two communication pipes 111 in the sealed box 110.
a, 11 lb. The tube t passes through the space x wall and is led out of the system.

The penetrating portion is sealed with a sealant, an O-ring 115, or the like. One communication pipe 111a is a cooling gas source (not shown)
From here, cold iJ] gas is introduced into the sealed box 110, and cold 7J] L is obtained from the coil 1. The communication pipe 111b is for exhaust gas and is either open to the atmosphere or connected to a suction pump (not shown) or the like.

The communication pipes 111a and 111b also serve as lead-out pipes for the power cord 112 of the coil 11, and are fitted with an appropriate seal 11.
A cord 112 extends from the tube via 3.

Note that the forced cooling u1 of the sealed box 110 may be performed as necessary. Further, various embodiments of the pond can be implemented, such as providing a jacket or the like on the outside of the sealed box 110 and supplying this cold fJI gas.

A squirrel cage rotor 12 is mounted at a position facing the coil 11. A drive shaft 120 extends vertically to the rotor 12 and is supported by bearings 3 at both ends thereof. Further, a stirring blade 2 "fS" is installed above the drive '1111120. As the material fif of the stirring blade !/!2, a metal material that can withstand high temperature and high humidity atmosphere is used.

The bearing 3 is composed of a hemispherical receiver 11r130 and a ball 31, and a hole is provided in the saucer 30, and the drive '11111
2 (+ end is inserted and J: is rotatably supported on the ball 31. Then, the upper saucer 30 is further fitted into the support box 300 via the spring 301, and the -F downward movement The box 300 has U-shaped legs 302 through which the stator core 1 is absorbed.
It is fixed above 0.

Note that here, we did not use the conventional general pivot bearing,
The bearing has a special structure that requires no lubrication and can withstand high heat and high rotations. That is, as described above, the saucer 30 has the parts shown in FIG.
As shown in FIG. 4, a plurality of balls 31 are purchased, a single ball 31' is further placed on top of the balls 31, and this ball 31' is placed in a bowl-shaped groove 121 formed at the tip of the drive shaft 120. The shaft 120 is supported by being fitted into the shaft 120. saucer 3
0 and the ball 31, it is preferable to use materials that do not require lubricating oil and have high tactility and wear resistance, such as carbon, 5iC1 cemented carbide, sapphire, and ceramics, depending on the properties and temperature of the fluid to be stirred. .

Also, the number of IC balls 31 and the number of layers stacked can be increased or decreased as appropriate; for example, as shown in FIG.
0 is provided, a plurality of balls 31 are placed in each saucer 30,
It is also possible to interpose one ball 31' in the middle to form a three-stage configuration.

According to the bearing having the above-described structure, the sliding suspension of the balls 31 is reduced compared to the conventional pivot bearing, so that no lubrication is possible, and wear is reduced.

Therefore, even if J3 is in a high temperature atmosphere or in liquid, P V la
can be made high, and can withstand high-speed rotation of the drive shaft 120.

The material of the drive @ 120, the rotor 12, or the iron core 10 is appropriately selected depending on the atmosphere in the closed space X.

Further, numeral 15 in the figure is a shaded coil.

In the above configuration, the coil 11, which is most vulnerable to high temperature, high pressure, and humid atmosphere, is housed in the sealed box 110. This allows for smooth stirring in the space X. Furthermore, by performing forced cooling W, the high temperature resistance performance can be further improved.

In addition, with this configuration, the sealed box 110 is not interposed in the magnetic field between the iron core 10 and the rotor 12, and there is no negative magnetic influence, so it is possible to obtain the same efficiency as a normal motor. I can do it.

Furthermore, since the bearings used are bearings that can withstand high temperatures, high pressures, and high humidity, and require no lubrication, good stirring can be maintained.

[Effects of the Invention] As explained in 1-1 above, according to the stirrer of the present invention, the stator winding of the rotor, which is a separate driving force, is sealed, so that high temperatures, which were conventionally thought to be irreproducible, can be avoided. , high-pressure, high-aeration atmosphere C can be easily stirred by an electric motor. In addition, since high temperature and high humidity resistant bearings are used, smooth In +'r can be maintained without any failures.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing an embodiment of the stirring device of the present invention;
FIG. 2 is a plan sectional view thereof, FIGS. 3 and 4 are arrangement diagrams of balls, and FIG. 5 is an enlarged sectional view showing another example of a bearing. 1... Motor, 2... Stirring blade, 3... Bearing, X.
...closed space.

Claims (1)

[Claims] 1. In a fluid stirring device installed in a closed space for a fluid to be stirred, a motor with only a stator winding housed in a sealed container is installed, and stirring blades are attached to the drive shaft of the motor, A fluid stirring device further characterized in that the drive shaft is supported by a high temperature and humidity resistant bearing. 2. In a fluid stirring device installed in a closed space for the fluid to be stirred, a motor with only the stator winding housed in a sealed container is installed, a stirring blade is attached to the drive shaft of the motor, and the drive shaft is A fluid stirring device supported by a high-temperature and high-humidity bearing, characterized in that a communication pipe is provided in the sealed container to lead the fluid to be stirred out of the sealed space, and cooling gas is blown into the sealed container from the communication pipe.