JP2017131844A - Agitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agitator which makes the handling work simple and economical and shows excellent defoaming property or reactivity according to processing purposes even the level of a solution in an agitation tank fluctuates.SOLUTION: In an agitator equipped with an agitation tank and an agitation machine with an agitation vane inserted in the agitation tank, the agitation machine equipped with a motor, a rotary shaft that rotates by the motor, and an agitation vane mounted on the rotary shaft by one or more stages, the agitation vane at least on the topmost stage is mounted on the rotary shaft to be able to elevate and lower, and the agitation vane is equipped with a float so that the agitation vane can elevate and lower with the level of the solution in the agitation tank under the buoyance of the float.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stirring device. A stirrer is used for processes such as mixing, dissolution, reaction, distillation, and vacuum dehydration. Generally, the stirring device includes a stirring tank and a stirrer in which a stirring blade is inserted into the stirring tank, and the stirrer includes a motor, a rotating shaft rotated by the motor, and a stirring blade attached to the rotating shaft. I have. Various types of stirring tanks are used, such as an open system, a closed system, a heating / cooling system, a pressurizing / depressurizing system, etc. Attached only with two or more stages, and the stirring blades are paddle type, turbine type, ribbon type, screw type, max blend type Various types are also used, such as those of full-zone type. The present invention relates to an improvement of such a stirring device.

  Conventionally, a stirrer tank and a stirrer in which a stirring blade is inserted into the stirrer tank are provided, and the stirrer is attached to a motor, a rotating shaft rotated by the motor, and one or more stages on the rotating shaft. Various types of stirring devices including the stirring blades are known (see, for example, Patent Documents 1 to 8). However, among these conventional stirring devices, those equipped with a stirrer in which the blades of the stirring blades are provided over almost the entire area of the stirring tank, for example, the blades of the stirring blades of the Max blend type A device equipped with a full-zone stirrer can achieve a reasonably high stirring effect, but because of its heavy load, it requires a large motor that is rich in weight and is not only difficult to handle, but also costs for equipment and operation. There is a problem that it is expensive and uneconomical.

  On the other hand, those equipped with a stirrer in which a blade portion of a stirring blade is disposed in a part of the stirring tank, for example, a blade portion of a stirring blade provided with a paddle type or turbine type stirrer, Since the motor is reasonably light and small, handling is simple, equipment costs and operating costs are low, and there are advantages of economics. On the other hand, the stirring blade is fixedly attached to the rotating shaft, so stirring is performed during processing. When the liquid level of the solution in the tank fluctuates, there is a problem that the stirring blade often does not exist near the liquid level. In the agitation tank, if there is no blade part of the agitation blade near the liquid surface of the solution, bubbles that may be generated on the liquid surface cannot be removed depending on the process. The bubbles generated on the surface are layered, and the processing efficiency is deteriorated by the bubbles. Further, in the stirring tank, if there is no blade portion of the stirring blade near the liquid level of the solution, the reactive gas in the upper space in the stirring tank cannot be taken into the solution and both can be brought into sufficient contact, for example, In the production of an alkylene oxide adduct using an autoclave, the alkylene oxide gas remaining in the upper space cannot be taken into the solution and brought into sufficient contact with each other. Therefore, the reaction efficiency is poor and it takes time to complete the reaction.

JP 58-49710 A JP-A-5-49890 JP-A-5-76745 JP-A-6-312122 JP 9-131502 A JP-A-11-267484 JP 2007-260646 A JP 2013-49045 A

  The problem to be solved by the present invention is that the handling work is simple and economical, and even if the liquid level of the solution in the stirring vessel fluctuates, excellent defoaming properties and reactivity are achieved depending on the purpose of the treatment. The stirring device shown is to be provided.

  The present invention that solves the above-described problems includes a stirring tank and a stirrer in which a stirring blade is inserted in the stirring tank. The stirrer includes a motor, a rotating shaft that is rotated by the motor, and a rotating shaft. In a stirring device including a stirring blade attached in one or more stages, at least the uppermost stirring blade is attached to the rotating shaft so as to be movable up and down, and the stirring blade is equipped with a float, According to the stirring device, the stirring blade moves up and down together with the liquid level of the solution in the stirring tank by floating buoyancy.

  A stirrer according to the present invention (hereinafter referred to as a device of the present invention) includes a stirrer and a stirrer in which a stirring blade is inserted into the stirrer, and the stirrer is a motor and a rotating shaft that is rotated by the motor. And a stirring blade attached to the rotating shaft in one or more stages. Various types of stirring tanks are available, such as an open system, a closed system, a heating / cooling system, a pressurizing / depressurizing system, etc. Attached in two or more stages, and the blades of the stirring blades are paddle type, turbine type, ribbon type, screw type, etc. Various types also apply.

  In the apparatus of the present invention, among the stirring blades attached to the rotating shaft of the stirrer in one or more stages, at least the uppermost stirring blade is attached to the rotating shaft so as to be movable up and down. Is equipped with a float, and the stirring blade moves up and down together with the liquid level of the solution in the stirring tank by the buoyancy of the float.

  As described above, at least the uppermost stirring blade is attached to the rotating shaft so as to be movable up and down, and the stirring blade is equipped with a float, and the stirring blade is brought into the stirring tank by the buoyancy of the float. As long as it is raised and lowered together with the liquid level of the solution, the structure and shape are not limited any more, but the uppermost stirring blade is a ring-shaped attached to the rotating shaft so as to be raised and lowered. It is preferable to include a boss, a blade portion radially attached to the boss, and a boss and / or a float attached to the blade portion. It is preferable that the boss and / or the blade portion is formed in a hollow structure that also serves as a float. When a float is attached to the boss and / or the blade part, the float can be attached to the lower part of the boss or the blade part, or can be attached to the upper part of the boss or the blade part. These floats are usually hollow, made of metal, glass coated metal, ceramic coated metal, including the case where the boss and blades are formed in a hollow structure that also serves as a float. It is preferable to use stainless steel as the metal.

  In the uppermost stirring blade, the number, shape, size, position, angle, and structure of the blade portion radially attached to the boss are arbitrary as long as the blade is balanced with respect to the boss. Two to six sheets are preferable, and the shape is preferably a paddle type or a turbine type, and more preferably a paddle type.

  In addition, the means for attaching the uppermost stirring blade to the rotary shaft so as to be movable up and down is not particularly limited. And means for forming the outer peripheral surface of the boss into a shape that slides on the outer peripheral surface of the rotating shaft. 2) A guide rail is provided along the axis of the outer peripheral surface of the rotating shaft and the boss has an inner peripheral surface. Means for forming a groove to be slidably fitted with the guide rail, 3) A groove is formed on the outer peripheral surface of the rotating shaft along the axis thereof, and the guide rail which is slidably fitted with the groove is projected on the inner peripheral surface of the boss. The means to install is preferable. In the case of 1) above, the blade part is guided by the outer peripheral surface of the rotating shaft formed in a deformed shape together with the boss, and in the case of 2), the blade part is guided by the guide rail through the groove. In the case of the above 3), the blade part moves up and down with the boss guided by the groove through the guide rail.

  In the apparatus of the present invention, the stirring blade is attached to the rotating shaft in one or more stages. When the stirring blade is attached to the rotating shaft in only one stage, the one-stage stirring blade is the above-described uppermost stirring blade. When the stirring blade is attached to the rotating shaft in a plurality of stages of two or more stages, all of the plurality of stages of the stirring blades can be configured in the same manner as the uppermost stirring blade. In order to ensure the safety of the apparatus of the present invention including such cases, it is preferable to appropriately attach a stopper to the rotating shaft to limit the ascending and descending positions of the agitating blade, and at least the uppermost agitation. The blade portion is preferably a paddle type or a turbine type, and more preferably a paddle type.

  The apparatus of the present invention described above is easy to handle and economical, and exhibits excellent defoaming properties and reactivity depending on the purpose of treatment even if the liquid level of the solution in the stirring tank fluctuates. There is an effect.

The partial longitudinal cross-sectional view which shows the apparatus of this invention. FIG. 2 is a partially enlarged longitudinal sectional view showing the apparatus of the present invention in FIG. 1. The partially expanded longitudinal cross-sectional view which shows the apparatus of other this invention. The partially expanded longitudinal cross-sectional view which shows the apparatus of other this invention. The partially expanded longitudinal cross-sectional view which shows the apparatus of other this invention. FIG. 2 is a partially enlarged cross-sectional view showing the apparatus of the present invention in FIG. 1. FIG. 4 is a partially enlarged cross-sectional view showing another apparatus of the present invention. FIG. 4 is a partially enlarged cross-sectional view showing another apparatus of the present invention.

  In FIG. 1, an upper mirror 12 as a lid is attached to a bottomed cylindrical tank body 11 so as to be openable and closable. A jacket 13 is provided on the side peripheral surface of the tank main body 11, and heating steam and cooling water are passed through the jacket 13. In FIG. 1, the jacket 13 is provided on the inner side of the side peripheral surface of the tank body 11. However, such a jacket can be provided on the outer side of the side peripheral surface of the tank body. It is also possible to incorporate a heater in such a jacket. The upper mirror 12 is provided with supply ports 15, 16, and 17. A supply pipe 19 having a tip formed at the ring portion 18 from the supply port 17 is inserted into the tank body 11. Is provided with a plurality of openings not shown.

  A motor 21 is supported at the upper central portion of the upper mirror 12, and a rotation shaft 31 of the motor 21 is inserted into the tank body 11. The space between the tank body 11 and the upper mirror 12 and the space between the upper mirror 12 and the rotary shaft 31 are sealed, so that the tank body 11 and the upper mirror 12 form a closed system.

  Agitation blades 41, 42, and 43 are attached to the rotating shaft 31 inserted into the tank body 11 in a total of three stages. The first-stage agitating blade 41 and the second-stage agitating blade 42 are fixedly attached to the rotating shaft 31, and the third-stage agitating blade, that is, the uppermost agitating blade 43 is attached to the rotating shaft 31 so as to be movable up and down. It has been. Stoppers 43a and 43b are attached to the rotating shaft 31, and the rising and lowering positions of the uppermost stirring blade 43 are restricted by the stoppers 43a and 43b.

  In FIG. 2, the stirring blade 43 includes a ring-shaped boss 51, a total of two blade portions 61 and 62 attached symmetrically to the upper portion of the boss 51, and a hollow structure attached to the lower portion of the boss 51. A shaped float 71 is provided. The inner peripheral surfaces of the boss 51 and the float 71 are slidably fitted with the outer peripheral surface of the rotating shaft 31, and the blade portions 61 and 62 are paddle-shaped. In FIG. 2, the float 71 is attached to the lower part of the boss 51. However, the float can also be attached to the upper part of the boss. In this case, the blade part is attached to the upper part of the float.

  In FIG. 3, the stirring blade 44 includes a ring-shaped boss 52 having a hollow structure and a total of two blade portions 63 and 64 attached to the upper portion of the boss 52 symmetrically. The ring-shaped boss 52 having a hollow structure also serves as a float, its inner peripheral surface is slidably fitted with the outer peripheral surface of the rotating shaft 32, and the blade portions 63 and 64 are paddle type. In FIG. 4, the stirring blade 45 includes a ring-shaped boss 53, a total of two blade portions 65 and 66 attached symmetrically to the upper portion of the boss 53, and a hollow attached to the lower portion of the blade portions 65 and 66. Structure floats 72 and 73 are provided. The inner peripheral surface of the boss 53 is slidably fitted with the outer peripheral surface of the rotating shaft 33, and the blade portions 65 and 66 are paddle type. In FIG. 4, the floats 72 and 73 are attached to the lower part of the blade parts 65 and 66. However, such a float can be attached to the upper part of the blade part. In FIG. 5, the stirring blade 46 includes a ring-shaped boss 54 and a total of two hollow blade portions 67 and 68 attached symmetrically to the upper portion of the boss 54. The inner peripheral surface of the boss 54 is slidably fitted with the outer peripheral surface of the rotary shaft 34, and the blade portions 67 and 68 having a hollow structure also serve as a float and are of a paddle type.

  1, 2, and 6, guide rails 81 and 82 are provided on the outer peripheral surface of the rotary shaft 31 so as to be symmetrical in the front-rear direction (up and down in FIG. 6), and the inner periphery of the boss 51 and the float 71. Grooves 91 and 92 slidably fitted to the guide rails 81 and 82 are formed on the surface symmetrically in the front-rear direction (up and down in FIG. 6). The blade portions 61 and 62 together with the boss 51 and the float 71 are guided to the guide rails 81 and 82 via the grooves 91 and 92 by the buoyancy of the float 71, and along the axis of the rotation shaft 31, the inside of the tank body 11 is illustrated. It moves up and down with the liquid level of the solution that does not.

  In FIG. 7, grooves 93 and 94 are provided on the outer peripheral surface of the rotary shaft 35 symmetrically in the longitudinal direction along the axis (in FIG. 7, vertically), and the grooves 93 and 94 are formed on the inner peripheral surface of the boss 55. The guide rails 83 and 84 that are slidably fitted are formed symmetrically in the front-rear direction (up and down in FIG. 7). Other configurations which are not described here are the same as those described above with reference to FIGS. 1, 2 and 6. However, the blades (not shown) together with the bosses 55 are stripped via the guide rails 83 and 84 by floating buoyancy. Guided by the grooves 93 and 94, it moves up and down along the axis of the rotary shaft 35 together with the liquid level of the solution (not shown) in the tank body (not shown).

  In FIG. 8, the outer peripheral surface of the rotating shaft 36 is partially formed in a square cross section, and the inner peripheral surface of the boss 56 is formed in a cross sectional square shape that is slidably fitted to the outer peripheral surface of the rotating shaft 36. Other configurations that are not described here are the same as those described above with reference to FIGS. 1, 2, and 6. However, a blade portion (not shown) together with the boss 56 is formed in a square cross section by floating buoyancy (not shown). It is guided by the rotating shaft 36 and moves up and down along the axis of the rotating shaft 36 together with the liquid level of the solution (not shown) in the tank body (not shown).

  According to the present invention described above, even if the liquid level of the solution in the tank body fluctuates, the vane portion of the stirring blade existing near the liquid level is required to eliminate bubbles that may be generated on the liquid level. Such bubbles can be effectively defoamed, and if it is desired to promote the reaction between the reactive gas and the solution that may remain in the upper space in the tank body, such reactivity It is also possible to promote both reactions by taking gas into the solution and bringing them into full contact.

DESCRIPTION OF SYMBOLS 11 Tank main body 12 Upper mirror 21 Motor 31-36 Rotating shaft 41-46 Stirring blade 51-54 Boss 61-68 Blade part 71-73 Floating 81-84 Guide rail 91-94 Groove

Claims (7)

  A stirrer and a stirrer in which a stirring blade is inserted into the stirrer are provided. The stirrer is attached to a motor, a rotating shaft rotated by the motor, and one or more stages on the rotating shaft. In the stirring device including the stirring blade, at least the uppermost stirring blade is attached to the rotating shaft so as to be movable up and down, and the stirring blade is equipped with a float, and the stirring blade is caused to be stirred by the buoyancy of the float A stirrer characterized by moving up and down with the liquid level of the solution inside.   A ring-shaped boss in which the uppermost stirring blade is attached to the rotating shaft so as to be movable up and down, a blade portion radially attached to the boss, and a float attached to the boss and / or the blade portion The stirring device according to claim 1.   A ring-shaped boss in which the uppermost stirring blade is attached to the rotary shaft so as to be movable up and down, and a blade portion radially attached to the boss, and the boss and / or the blade portion has a hollow structure that also serves as a float The stirring device according to claim 1, which is formed.   The stirring device according to claim 2 or 3, wherein the outer peripheral surface of the rotating shaft is formed in an irregular shape that is not circular in a radial cross section, and the outer peripheral surface of the boss is formed in a shape that slides on the outer peripheral surface of the rotating shaft. .   A guide rail is projected along the axis line on the outer peripheral surface of the rotating shaft, and a groove is formed on the inner peripheral surface of the boss so as to be slidably fitted with the guide rail. The stirring device according to claim 2 or 3, wherein the agitating device is moved up and down while being guided by a guide rail.   A groove is formed along the axis on the outer peripheral surface of the rotating shaft, and a guide rail that slides on the groove is projected from the inner surface of the boss. The stirring device according to claim 2 or 3, wherein the agitating device is moved up and down while being guided by a groove.   The agitation tank is of a closed system comprising a tank body and a lid that is attached to the tank body so as to be openable and closable, and the rotating shaft of the stirrer is inserted into the tank body from the upper part of the lid, and the rotation The stirring device according to any one of claims 1 to 6, wherein a stirring blade is attached to an insertion portion of the shaft.

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