JP2000153144A - Stirring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stirring apparatus having flow characteristics (draft tube effect) equal to those of a stirring tank free from a depleted part even if there is the depleted part in a coil group and forming an up and down circulating flow in the tank and capable of achieving the shortening of an up and down uniform mixing time, the uniformization of flow velocity in an up and down direction and the shortening of a heat transfer time. SOLUTION: In a stirring apparatus wherein a stirring blade is provided in a stirring tank 1 and heat transfer coil groups 3A, 3B heating or cooling a liquid in the stirring tank 1 are attached to the inner wall of the stirring tank 1, a coil fence closing a coil depleted part is attached to the coil depleted part generated in an up and down direction in the heat transfer coil groups 3A, 3B. The coil fence is pref. a dummy coil 4 having the same flow resistance as a coil 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a stirring device.
More specifically, the present invention relates to a stirrer used in various industrial fields for solid-liquid stirring, liquid-liquid stirring, and gas-liquid stirring, and particularly provided with a heat transfer coil group for heating or cooling a liquid in a tank.

[0002]

2. Description of the Related Art FIG. 4A is a sectional view of a conventional stirring device, and FIG. 4B is a developed view of a state in which a coil 2 is mounted on an inner wall of a stirring tank. In FIG. 4, 1 is a stirring tank, 2 is a stirring blade provided in the tank, and 3 is a heat transfer coil. Since the entrance / exit portion 3a of the heat transfer coil 3 is attached to the inner wall of the tank by welding, an open space for welding work is required near the entrance / exit portion 3a, and the coil 3 can be attached to that portion. Can not. For this reason, in the case of a vertically divided coil, a missing portion L in which no coil exists is generated. Further, in the case of a multiple coil having two or more coils as shown in FIG. 5, a larger welding work space is required, so that a large number of coil missing portions L are generated.

[0003]

In a stirring tank type stirring apparatus, a stirring blade is rotated to cause the liquid in the tank to flow and mix, and a one-stroke circulating flow is formed in the liquid in the tank. It is known that the mixing becomes uniform. In other words, if the circulating flow is cut off, or a portion that does not flow or a portion that does not flow easily occurs, the mixing is not uniform, and the purpose of stirring is not sufficiently achieved.

Conventionally, however, no adverse effect on the flow due to the lack of a coil has been discussed, and no countermeasure has been taken. By the way, according to the study of the present inventors, if a missing portion of the coil is present, a so-called sub-circulation flow in which the liquid escapes from the missing portion is generated, and uniformity in the tank is hindered and stirring is performed. It has been found that performance is adversely affected. For example, when the coil group 3 is vertically divided by the single coil shown in FIG. 4, it can be seen that a sub-circulation flow in which the liquid escapes from the coil missing portion L is generated. Also, as can be easily imagined, in the case of a multiple coil having two or more coils shown in FIG.
The missing portion L tends to increase, and therefore, the flow characteristics are significantly reduced.

[0005] In view of the above circumstances, the present invention provides the same flow characteristics (draft tube effect) as a stirring tank having no missing portion even if the coil group has a missing portion, and creates a single-stroke vertical circulating flow in the tank. It is an object of the present invention to provide a stirrer that can form and reduce the time required for uniform mixing in the vertical direction, uniform flow velocity in the vertical direction, and reduced heat transfer time.

[0006]

According to the first aspect of the present invention, there is provided a stirrer.
A stirring device in which a stirring blade is provided inside the stirring tank, and a heat transfer coil group for heating or cooling the liquid in the tank is attached to an inner wall of the stirring tank. A coil fence for closing the coil missing portion is attached to the generated coil missing portion in the tank. According to a second aspect of the present invention, in the first aspect of the invention, the coil fence is configured by a dummy coil having a flow resistance similar to that of the coils of the coil group.

According to the first aspect of the present invention, the coil fence is installed in the coil missing portion so as to close the missing portion, thereby preventing "liquid escape" occurring in the missing portion and preventing the generation of the sub-circulation flow. Since the flow is suppressed, it is possible to exhibit a flow characteristic equivalent to a continuous coil having no missing portions, more specifically, a rectifying effect (draft tube effect) of liquid. The draft tube effect forms a one-stroke vertical circulating flow, and uniform mixing in the upper and lower directions can be achieved in a shorter time than in a state where the coil is missing. In addition, since a uniform flow velocity is obtained in the up-down direction by the draft tube effect, heat transfer on the coil surface without unevenness can be obtained as compared with a state where the coil is missing. Further, since a good flow state is achieved, the amount of heat transfer that can be moved is larger than that in the case where the coil is missing, and it is expected that the time required for heat transfer can be reduced. According to the second aspect of the present invention, since the dummy coil closing the coil missing portion has the same flow resistance as the original coil, it exhibits a particularly high draft tube effect and is equivalent to a stirring tank having no coil missing portion. High stirring performance can be exhibited.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a stirring tank according to one embodiment of the present invention, FIG. 2 is a sectional view of a stirring tank according to another embodiment of the present invention, and FIG. is there.

The stirrer shown in FIG. 1 is an embodiment in which a double coil 3 is mounted on a stirring tank 1, and is separately mounted on an upper coil group 3A and a lower coil group 3B. A dummy coil 4 is attached as a coil fence to a portion corresponding to a missing portion caused by attaching the entrance portion 3a of the coil 3. The mounting method of the dummy coil 4 is arbitrary, and the support 5 supporting each dummy coil 4 may be fixed to an appropriate support base 6 in the tank, or may be fixed to the existing upper and lower coils 3.

The dummy coil 4 is preferably a member having the same flow resistance and the same shape as the original coil 3. In this case, the rectifying effect of the liquid (draft tube effect) does not change the influence of the original coil 3 on the liquid in the tank at all, and a circulating flow similar to that of a stirring tank having no coil missing portion can be obtained.

The stirring tank 1 shown in FIG. 2 is an embodiment in which a single coil 3 is mounted, and is separately mounted on an upper coil group 3A and a lower coil group 3B. Then, a plate 7 is attached to a portion corresponding to the entrance / exit of the coil 3 and a missing portion caused by attaching the portion 3a. This plate is not limited to a flat plate, but may be a square bar or the like.

In each of the above embodiments, the coil fence is, in short, a member for filling the missing portion, and it is only necessary to prevent the generation of the sub-circulation flow, and various shapes and materials may be used as long as the effect can be achieved. Fences can be used.

FIG. 3 shows the effect of the present invention, and shows the circulating flow of the liquid in the tank which occurs in the embodiment in which the missing portion of the original coil is filled with the dummy coil 4. As shown in the drawing, according to the present invention, a so-called one-stroke vertical circulating flow is generated, and a flow characteristic equivalent to a continuous coil group having no coil missing portions is obtained.

[0014]

According to the first aspect of the present invention, it is possible to prevent "liquid escape" occurring in a coil missing portion, suppress the generation of a sub-circulation flow, and achieve flow characteristics equivalent to those of a continuous coil having no missing portions. More specifically, a rectifying effect (draft tube effect) of the liquid is exhibited. As a result, uniform mixing can be achieved in a short time, heat transfer on the coil surface without unevenness can be obtained, and a reduction in heat transfer time can be expected. According to the invention of claim 2,
Since the dummy coil that blocks the coil missing part has the same flow resistance as the original coil, it exhibits a particularly high draft tube effect and can exhibit the same high stirring performance as a stirring tank with no coil missing part. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view of a stirring tank according to an embodiment of the present invention.

FIG. 2 is a sectional view of a stirring tank according to another embodiment of the present invention.

FIG. 3 is an explanatory diagram of a circulating flow in the stirring tank of the present invention.

FIG. 4 (A) is a schematic sectional view of a conventional stirring tank provided with a single coil, and FIG. 4 (B) is a developed view in a state where the coil 2 is mounted on an inner wall of the stirring tank.

FIG. 5 is a sectional view of a conventional stirring tank provided with a double coil.

[Explanation of symbols]

 Reference Signs List 1 stirring tank 2 stirring blade 3 coil 4 dummy coil 5 support 6 support base 7 plate

Continuing from the front page (72) Inventor Masao Yamaoka 1 Sanyo Chemical Industry Co., Ltd., 11-11, Hitotsubashi-Honcho, Higashiyama-ku, Kyoto (72) Inventor Mineo Nakano 1-11-11 Hitotsubashi Nohonmachi, Higashiyama-ku, Kyoto, Sanyo Chemical Industry Co., Ltd. F term (reference) 4G037 CA02 CA11 EA04 4G078 AA02 BA05 CA05 EA03

Claims (2)

[Claims] 1. A stirring blade is provided inside a stirring tank,
A stirrer in which a heat transfer coil group for heating or cooling the liquid in the tank is attached to an inner wall of the stirring tank, and the coil cutout portion formed in a vertical direction in the heat transfer coil group is closed with the coil cutout portion. A stirring device comprising a coil fence mounted in a tank. 2. The stirrer according to claim 1, wherein the coil fence is constituted by a dummy coil having a flow resistance similar to that of the coils of the coil group.