JPH0148814B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a stirring device having coils for cooling and heating inside a stirring tank. Prior Art Since a highly viscous liquid has poor stirring efficiency, it is difficult to quickly and uniformly heat or cool the liquid. Therefore, attempts have been made to place cooling/heating coils inside the stirring tank in order to improve cooling or heating efficiency in stirring and mixing devices for highly viscous liquids, but in this case, the rotation of the stirring blades is obstructed. The coils were placed outside the stirring blades and close to the inner wall of the stirring tank to prevent this from happening. Problems to be Solved by the Invention However, in such a device, when cooling water is passed through the coil, supercooling occurs between the coil and the inner wall surface of the stirring tank in the case of a highly viscous liquid, and this portion The disadvantage was that the viscosity of the liquid increased, and the liquid near the coil no longer flowed, making it partially impossible to stir. An object of the present invention is to provide a stirring device in which a cooling/heating coil is disposed inside a stirring tank, which can stir and mix a highly viscous liquid while efficiently cooling or heating it. Means for Solving the Problems The device of the present invention has a cylindrical stirring tank having a rotating shaft in the center, and a cooling/heating device installed at a certain distance from the inner wall of the stirring tank around the rotating shaft. The coil for use is arranged in a suspended manner,
An anchor-shaped stirring blade is attached to the rotating shaft, and the tip of the stirring blade extends upward for cooling and cooling.
It is characterized in that it is rotatably located between the heating coil and the inner wall surface of the stirring tank. That is, in the present invention, the stirring blade can be rotated between the cooling/heating coil and the inner wall of the stirring tank, which was conventionally considered to impair the stirring efficiency during cooling when stirring and mixing high viscosity liquids. In particular, it can be used like a baffle plate to significantly increase stirring efficiency even for highly viscous liquids, making it possible to perform extremely efficient cooling or heating mixing. A cooling/heating jacket may be attached to the lower outer periphery of the stirring tank in the usual manner. In this case, the stirring tank is formed so that it can be divided into upper and lower halves to facilitate attachment and detachment of the stirring blades to the rotating shaft. It is preferable to hang a cooling/heating coil on the upper wall of the stirring tank or on the lid of the stirring tank, and to attach a cooling/heating jacket to the lower part of the stirring tank. Note that the stirring blades are formed by vertically and/or horizontally tilting rectangular blades upward at both ends of a rod-shaped portion having means for attaching to a central rotating shaft and extending substantially horizontally. By attaching it, the flow of liquid during stirring is directed upward, and the stirring efficiency of highly viscous liquid can be further improved. The bending angle of the stirring blade from a vertical plane including the rotating shaft and the rod-shaped portion is preferably about 35 to 50 degrees, and the angle of inclination to the vertical plane is preferably about 5 to 20 degrees. Next, embodiments of the present invention will be described according to the drawings. The apparatus shown in FIG. 1 has a rotating shaft 3 in the center of a cylindrical stirring tank 1, and the stirring tank 1 is rotated around this rotating shaft 3.
A cooling/heating coil 2 is attached at a constant interval from the inner wall surface 6 of the rotary shaft 3, and an anchor-shaped stirring blade 4 is attached to the tip of the rotating shaft 3. The stirring tank 1 is formed so that it can be divided into upper and lower halves, and a cooling/heating coil 2 is installed on the wall surface of the upper part 8 of the stirring tank.
is suspended, and cooling and
A heating jacket 7 is attached. Further, the rotating shaft 3 is attached to the lid 10 in a state where it can be driven by a motor (not shown) located above, and extends above the stirring blade 4 rotated by the rotating shaft 3. The tip 5 is located between the cooling/heating coil 2 and the inner wall surface 6 of the stirring tank 1. The liquid placed in the stirring tank 1 is doubly cooled or heated by water or heated steam introduced into the jacket 7 and the coil 2, and is stirred and mixed by the stirring blade 4. Since the tip 5 of 4 is located between the coil 2 and the inner wall surface 6 of the stirring tank 1, even if the liquid has a high viscosity of 500 to 50,000 cps,
It can be stirred very efficiently, and uniform mixing and heat exchange can be achieved in a short period of time. In addition, in such a stirring device, the stirring blade 4
Varying the angle vertically and/or horizontally has the advantage of keeping the stirring efficiency constant and reducing power. Colored chips were put into a CMC aqueous solution with a viscosity of 3000 ops at 25°C, and A,
Using the device shown in Figure 1 that uses three types of stirring blades 4, B and C, stirring is performed by changing the rotation speed of the stirring blade 4, and uniform stirring is achieved (the colored chips are uniformly dispersed throughout).
The time taken was measured. The results are shown in Table 1. Each of the stirring blades A, B, and C has a rectangular shape substantially similar to the stirring blade 4 in FIG. The blades 12 are mounted upward, but the two blades 12 in A are mounted with their upper ends tilted forward and backward at an angle of 15 degrees with respect to the vertical plane that includes the rotating shaft 3 and the rod-shaped portion 11. , B are attached with their outer edges twisted left and right at an angle of 45 degrees with respect to the above vertical plane, and the two wings 12 of C are attached with their upper ends tilted forward and backward with respect to the above vertical plane. It is attached by tilting it at an angle of 15 degrees and at the same time twisting the outside edge left and right at an angle of 45 degrees.

【table】

[Table] The device is equipped with a coil (2).
From the results in Table 1, it can be seen that in the device in which the coil 2 is provided in a fixed relationship with the stirring blade 4 according to the present invention, the stirring is equivalent to that in the case (device) without the coil 2, regardless of the shape of the stirring blade 4. It can be seen that efficiency can be obtained. Furthermore, in the apparatus, since the coil 2 acts as a baffle plate, uniform stirring is possible with considerably less power (current) than in the case of an apparatus without the coil 2. It can also be seen that when the stirring blades 4 take the shape of C, uniform stirring is achieved in a short time with extremely low power consumption. Effects of the Invention In the device of the present invention, since the anchor-shaped stirring blades 4 are provided to stir the liquid between the cooling/heating coil 2 and the inner wall surface 6 of the stirring tank 1, the device of the present invention can handle liquids with high viscosity. Even when the temperature is low, uniform stirring and mixing can be carried out quickly and efficiently while cooling or heating. The apparatus of the present invention can be effectively used particularly for stirring liquids whose viscosity changes.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the device of the present invention;
FIG. 2 is a front view of the stirring blade, and FIG. 3 is a plan view of the stirring blade in FIG. 2. 1... Stirring tank, 2... Coil, 3... Rotating shaft,
4... Stirring blade, 5... Upper part, 6... Inner wall surface, 7...
... Jacket, 8 ... Upper part of stirring tank, 9 ... Lower part of stirring tank, 10 ... Lid, 11 ... Rod-shaped part, 12 ...
Wings.

Claims (1)

[Claims] 1. Inside a cylindrical stirring tank 1 having a rotating shaft 3 in the center, a cooling/heating coil is installed around the rotating shaft 3 and at a constant distance from the inner wall surface 6 of the stirring tank 1. A stirring blade 4 formed in an anchor shape is attached to a rotating shaft 3, and a tip 5 extending upward of the stirring blade 4 connects the coil 2 and the stirring blade 2. A stirring device characterized in that it is rotatably positioned between inner wall surfaces 6 of a tank 1. 2. The apparatus according to claim 1, wherein a cooling/heating jacket 7 is attached to the lower outer periphery of the stirring tank 1. 3. Claims in which the stirring tank 1 is formed to be able to be divided into upper and lower parts, the coil 2 is suspended from the wall surface of the upper part 8 of the stirring tank, and the cooling/heating jacket 7 is attached to the lower part 9 of the stirring tank. The device according to paragraph 2. 4 Any one of claims 1 to 3, in which the rotating shaft 3 is attached to the lid 10 of the stirring tank 1
The equipment described in section. 5 The stirring blade 4 has a rod-shaped portion 11 extending substantially horizontally and having means for attachment to the rotating shaft 3 in the center.
Claims 1 to 4 include rectangular wings 12 that are tilted upward at a certain angle vertically and/or horizontally at both ends of the blade.
The device according to any one of paragraphs.