JPH0226532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for stirring a fluid such as gas or liquid in a closed container in a high temperature environment.

<Prior Art> It is often necessary to stir a fluid under increased pressure or reduced pressure in a high-temperature environment. 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 containers such as tanks and furnaces, stirring is performed to rapidly homogenize the distribution of temperature and humidity and to promote the reaction of the reaction fluid. When performing such agitation, it is difficult to install a power source such as a motor in a high-temperature environment, so a power source such as an electric motor is usually installed outside the sealed container, and a rotating shaft is passed through the container. A stirring blade or the like is installed inside the tank for stirring.

<Problems to be Solved by the Invention> However, in the conventional stirring device described above, since the rotating shaft penetrates the closed container itself, there was a problem in that the rotating shaft of the penetrating portion had to be sealed. This seal is usually achieved by shaft sealing devices such as mechanical seals, labyrinth seals, oil seals, and gland packings, but as is well known, these shaft sealing devices cannot always completely prevent leakage, especially in closed containers. When the internal temperature is high and the pressure is high, or when the stirring blade rotates quickly, the sealing performance cannot be maintained sufficiently, causing a problem in which 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 carried out, and although it is advantageous to perform stirring, such as in high-temperature, high-pressure steam curing cans for lightweight aerated concrete, in reality, stirring is not carried out inside the container. There were many areas where stirring operations were not performed.

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

<Means for Solving the Problems> The present invention has been made based on the above-mentioned viewpoints, and there is no need to penetrate the rotating shaft into the sealed container of the fluid to be stirred, and the stirring can be reliably performed even in a high-temperature, high-pressure sealed container. The object of the present invention is to provide a stirring device that obtains the desired results.

The stirring device of the present invention first has a turbine chamber installed in a sealed container of a fluid to be stirred, such as gas or liquid. Here, the turbine chamber does not have to be a completely sealed space, and leakage to the extent permitted by current technology is acceptable, but there is no risk of the agitated fluid flowing into the turbine chamber or the turbine rotating fluid entering the sealed container. It is desirable to minimize outflow. For this purpose, a shaft sealing device is provided in this turbine chamber between it and the rotating shaft, which will be described later.

This turbine chamber is equipped with turbine blades,
A fluid supply device is provided that introduces fluid for rotationally driving the turbine blades into the turbine chamber from outside the container. The fluid used to rotate the turbine blades is
It may be discharged outside the closed container by providing a suitable discharge device, or it may be leaked into the closed container if there is no problem. The turbine blades are connected to a rotating shaft that transmits this rotation to the outside of the turbine room, and a stirring body such as a stirring blade is connected to the rotating shaft outside the turbine room. As described above, a shaft sealing device is installed between the rotating shaft and the turbine chamber. In addition, the rotating shaft is supported by the rotating contact of two or more spheres,
This makes it possible to use no lubrication.

As the fluid for rotationally driving the turbine blades, air, an inert gas such as N ₂ or Ar, a gas such as steam, or a liquid can be used.

The fluid for driving the rotation of the turbine blades may be supplied completely separately, but in some cases, gas or steam may be used to pressurize and heat the closed container. In other words, these gases and steam are normally brought down to a specified value from the high-pressure source tank through a pressure reducing valve, but they are introduced directly from the high-pressure source tank into the turbine chamber without going through the pressure reducing valve and are used to rotate the turbine blades. It is also possible to use it for driving. The discharged portion after being subjected to rotational driving may be leaked into a closed container and used for pressurization and heating, or may be taken out of the system and used for separate pressurization and heating. With this configuration, driving costs can be reduced.

<Operation> In the above configuration, if fluid is supplied into the turbine chamber from outside the container and the turbine blades are rotated, this rotation is transmitted to the stirring body by the rotation transmission device,
Rotate the stirrer. As a result, the fluid to be stirred in the closed container is stirred. The fluid supply device is
Since it is provided outside the closed container and does not come into contact with the high temperature atmosphere, there is no possibility of damage to the motor, which is the power device.

In addition, since there is no need to penetrate the container with a rotating shaft, there is no need to take precautions such as shaft sealing, and there is no risk of leakage even when the inside of the container is high temperature or pressure, or the stirring body rotation speed is high, ensuring reliable stirring. It can be performed.

Further, the fluid in the container does not leak into the turbine chamber, and even if it does leak, a small amount of fluid will not directly leak out of the upper container.

In addition, the bearing made of two or more spheres in rotational contact can withstand high-speed rotation, and since it is possible to use no oil, it is possible to prevent fires caused by lubricating oil at high temperatures.

<Example> An example of the present invention will be described below based on the drawings.

In FIG. 1, a main body A of a stirring device according to the present invention is placed in a closed container X for a fluid to be stirred.
The main body A has a cylindrical shape, with a lower half serving as a turbine chamber 1 and an upper half serving as a rotation space for a stirring blade 5, which will be described later.

A turbine blade 2 is installed in the turbine chamber 1 so as to be horizontally rotatable. Further, the turbine chamber 1 is provided with a small-diameter jet nozzle 30 for supplying fluid for rotating the turbine blades 2. This jet nozzle 30 is provided on the side periphery of the turbine chamber 1, and is connected to an introduction pipe 32 via a through hole 31 penetrating the main body A. The introduction pipe 32 penetrates the wall of the container X and leads out of the container,
It is connected to a fluid source (not shown) via a control valve 33 and a compressor, blower, pump, etc. 34 . The control valve 33 is controlled by a pressure control device 7, which will be described later. The nozzle 30, the through hole 31, the introduction pipe 32, the control valve 33, the pump etc. 34, and the fluid source constitute the fluid supply device 3.

Further, in this embodiment, the fluid used for the rotation of the turbine blades 2 is discharged from the turbine chamber 1 to the outside of the container X. That is, a discharge hole 35 is formed in the bottom surface of the turbine chamber 1, and a discharge pipe 36 is connected thereto.This pipe 36 penetrates the wall of the container It is designed to emit . The control valve 37
is also controlled by a control device 7, which will be described later.

The portions of the inlet pipe 32 and the outlet pipe 36 that penetrate the container X wall can be easily sealed and no leakage occurs because these pipes do not rotate like a shaft.

The turbine blade 2 is rotatably supported by a rotating shaft 4. This rotating shaft 4 passes through the turbine chamber 1 at the top and bottom, and is supported by bearings 6, 6 at the top and bottom ends of the main body A. Bearing/shaft seal devices 40, 40 are formed in the upper and lower rotating shaft penetration parts of the turbine chamber 1 to improve the sealing performance of the turbine chamber 1. Various types of bearing/shaft seal device 40 can be used, but in this embodiment, a pushing type labyrinth seal is used. Since the temperature inside the closed container is high, it is desirable to use a material with solid lubricity such as carbon or ceramic.

A stirring blade 5 is attached to the upper end of the rotating shaft 4, and the rotation of the turbine blade 2 is transmitted to the stirring blade 5. That is, the rotating shaft 4 serves as a rotation transmission device that directly transmits the rotation of the turbine blade 2. The stirring blade 5 is configured to rotate horizontally in a rotation space 50 in the upper half of the main body A. The upper end surface of the main body A has an inlet 5 for introducing the fluid to be stirred into the rotation space 50.
1 is formed, and an outlet 52 is formed on the side periphery of the upper half, and the rotation of the stirring blade 5 generates a flow in the direction of the arrow, and this flow stirs the fluid to be stirred in the closed container. ing. The position, size, quantity, etc. of the inlet 51 and the outlet 52 may be appropriately determined depending on the required stirring flow rate, the position of the main body A in the container X, and the like.

Although various materials can be used for the turbine blade 2, the bearing/shaft seal device 40, etc., carbon material is used in this embodiment. When carbon material is used, the turbine blade can be made lightweight,
Further, the bearing/shaft sealing device can be an oil-free bearing. In addition to carbon materials, organic materials, inorganic materials,
Similar effects can be obtained if the material is lightweight and has oil-free lubricity, such as a metal material or a composite material thereof.

In addition, when the fluid to be stirred is a liquid, the fluid that rotates the turbine is made into a gas, and is actively leaked from the shaft sealing device 40 into the fluid to be stirred in the container X without providing a discharge pipe, etc., and stirred by the stirring blade 5. In addition to this, it may be configured to perform stirring using gas bubbles.

Inside the inlet pipe 32, the discharge pipe 36, and the container X,
Pressure measurement devices 70, 71, and 72 are provided to measure the pressures P ₁ , P ₂ , and P ₃ , respectively, and the pressure values P ₁ , P ₂ , and P ₃ are input to the pressure control device 7 , where the pressure values are inputted to the pressure control device 7 . to control the control valves 33 and 37,
It is controlled so that P ₁ =P ₂ +ΔP. This ΔP
is approximately several atmospheres, but it can be determined according to the required rotational speed of the turbine blades.

In addition, P ₂ and P ₃ are controlled to approximately the same pressure to prevent the fluid to be stirred from flowing into the turbine chamber 1 through the bearing/shaft seal device 40, and conversely, the rotational driving fluid from flowing out into the closed container X. It is set as.

Next, the bearing 6 will be explained based on the enlarged view shown in FIG.

Here, a conventional general pivot bearing is not used, but a specially constructed bearing is used that requires no lubrication and can withstand high heat and high rotation. That is, the third
As shown in FIG. 4, a plurality of balls 61 are placed and a single ball 61' is placed on top of the balls 61.
The ball 61' is fitted into a bowl-shaped groove 41 formed at the tip of the rotating shaft 4 to support the shaft 4. As for the material of the ball 61, it is preferable to use a material with high contact resistance and wear resistance, such as carbon, SiC, cemented carbide, sapphire, and ceramics, which do not require lubricating oil, depending on the properties and temperature of the fluid to be stirred.

The number of balls 61 and the number of stacked stages can be increased or decreased as appropriate. For example, as shown in FIG.
It is also possible to construct a three-stage configuration by placing one ball 61' in between.

Note that the saucer 60 is supported by a spring 62 on the lower side and is movable in the vertical direction, and has a structure capable of absorbing thermal expansion of the rotating shaft 4 and the like.

According to the bearing with the above structure, the ball 6
Since the amount of slippage of 1 is smaller than that of conventional pivot bearings, no lubrication is possible, and wear is reduced.
Therefore, it is possible to obtain a high PV value even in a high temperature atmosphere or in a liquid, and it is possible to withstand high speed rotation of the rotating shaft 4.

In the above configuration, when fluid such as air is sent from the fluid supply device 3, the turbine 2 rotates, and the stirring blades 5 rotate accordingly. As a result, a flow is generated in the fluid to be stirred, and stirring is performed. In addition, with this configuration, there is no need for the rotating shaft or the like to pass through the container X, so that leakage from the closed container to the outside of the machine does not occur.

<Effects of the Invention> As explained above, according to the stirring device of the present invention, there is an effect that reliable stirring can be performed regardless of the environmental conditions without causing leakage to the outside of the closed container.

[Brief explanation of drawings]

Fig. 1 is a front sectional view showing one embodiment of the stirring device of the present invention, Fig. 2 is an enlarged sectional view of the bearing section, Figs. 3 and 4 are arrangement diagrams of balls, and Fig. 5 is another bearing. It is an enlarged sectional view showing an example. 1... Turbine chamber, 2... Turbine blade, 3...
Fluid supply device, 4... Rotating shaft, 5... Stirring blade, 6
...Bearing, 7...Pressure control device.

Claims (1)

[Scope of Claims] 1. A turbine chamber installed in a hermetically sealed container for agitated fluid; a turbine blade provided in the turbine chamber; and a turbine blade provided outside the container, the turbine blade being inserted into the turbine chamber from outside the container. a fluid supply device that supplies fluid for rotation; a rotating shaft that protrudes from the turbine chamber into the sealed container and transmits the rotation of the turbine blade to the outside of the turbine room; and a shaft that seals between the rotating shaft and the turbine chamber. A fluid stirring device comprising: a sealing device; a stirring body connected to the rotating shaft outside the turbine room; and a bearing supporting the rotating shaft through rotational contact between two or more spheres.