JPH0733870Y2 - Rotation drive device for liquid stirring - Google Patents

Description

[Detailed Description of the Invention] (1) Fields of Industrial Application The present invention is applicable to the pharmaceutical industry, food industry, chemical industry, etc.
The present invention relates to a liquid stirring rotary drive device used for processes such as mixing, dissolving, kneading, and diffusing liquids in a container.

(2) Conventional Technology The applicant has previously proposed, as a rotary drive device of this type, a cup-shaped rotor having a stirring blade on the outer surface of a casing surrounding a stator and at least a portion facing the rotor made of a non-magnetic material. It has been proposed to rotatably cover the rotor, to provide a through hole in the upper surface of the rotor, and to reduce the gap between the inner peripheral surface of the rotor and the outer peripheral surface of the housing.

(3) Problems to be Solved by the Invention According to the previously proposed rotary drive device, since the stator is provided in the housing, the stator is overheated by the current exciting the stator and the housing is deformed or wound. And the temperature rise of the agitated liquid occur, which adversely affects the durability and safety of the rotary drive device and the quality of the agitated liquid.

The present invention solves the above problems and has a simple structure and durability,
It is an object of the present invention to provide a rotary drive device having high safety and capable of efficiently stirring.

(4) Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a cooling fluid passage extending from below the central portion of the stator through the central portion to the vicinity of the upper surface in the casing. An opening is formed in the lower surface of the housing for the cooling fluid to pass through, or a cooling fluid passage extending from above the central portion of the stator to near the lower surface in the housing through the central portion is provided on the upper surface of the housing. It is characterized in that an opening through which the cooling fluid passes is formed.

(5) Action The cooling fluid is supplied into the housing through the cooling fluid passage or the opening, and is discharged through the opening or the passage while the cooling fluid is in contact with the stator. Thus, the laminated iron core, the winding wire, and the case forming the stator are cooled by the cooling fluid, and the temperature rise of the stator is suppressed.

(6) Embodiment One embodiment of the present invention will be described below with reference to FIG.

(1) shows a stirring tank, in which the central portion of the bottom plate of the stirring tank (1) is formed in a convex shape, and at least a portion of the convex portion (1a) facing a rotor (3) described later is A stator (2) made of a non-magnetic material was provided inside the protrusion. The stator (2) is a laminated iron core (2
a) and a winding wire (2b), and a pipe (4) is inserted into a central hole of the center of the iron core (2a) to form an air passage (5). The lower end of the pipe (4) is fixed through the supporting plate (6) that supports the stirring tank (1), and the lower surface of the supporting plate (6) of the pipe (4) is expanded into a trumpet shape. And a fan (7) is attached to its end. Here, the convex portion and the supporting plate (6) form a housing (1a), and the supporting plate (6) forms a lower surface of the housing (1a).

The rotor (3) has a cup shape, and the housing (1a)
It has a small gap between it and the outer peripheral surface, has a through hole (3a) in the center of the upper surface, and has stirring blades (3b) ... (3b) on the outer peripheral surface and the upper surface. It is provided. (8) ...
(8) is an opening formed in the lower surface of the supporting plate (6), that is, the lower surface of the casing (1a) below the peripheral portion of the stator (2), (9)
... (9) shows the leg which supports the said stirring tank (1).

Next, the operation of the stirring device having the above structure will be described.

When the winding (2b) of the stator (2) is energized to generate a moving magnetic field, the rotor (3) is rotationally driven by forming a liquid bearing with a small gap between the rotor (3) and the housing (1a). Then, the liquid (A) is stirred by the stirring blades (3b) ... (3b) provided on the rotor (3). When the fan (7) is energized, the fan (7) sucks air and blows it into the ventilation passage (5). Then, it circulates in the casing (1a) and is exhausted to the outside from the openings (8) ... (8) through the peripheral portion of the stator (2).
Thus, the central part and the peripheral part of the stator (2) and the winding wire (2b)
Are cooled, the rotation of the rotor (3) becomes smooth, and the liquid (A) can be efficiently stirred.

In the air circulation path, the rotation of the fan (7) may be reversed so that the air can be taken in through the openings (8) ... (8) and exhausted into the ventilation passage (5).

FIG. 2 shows another embodiment in which a rotary drive device is provided in the upper part of the stirring tank (1), and the casing (1a) of the rotary drive device is the stirring tank (1). Is supported by a support pipe (10) from the top surface of the
A pipe (4) is fitted and inserted into a central portion of the inside, and a lower end portion of the pipe (4) is fitted and inserted into a center hole of the stator (2) and an upper portion of the pipe (4) is expanded into a trumpet shape. A fan (7) is installed inside thereof. The operation of this embodiment is similar to that of the previous embodiment.

Incidentally, in any of the above-mentioned embodiments, the stator (2)
Although the formula for cooling the stator with air has been shown, the stator may be cooled by supplying a liquid such as cooling water with a pump as needed.

(7) Effect of the Invention Thus, according to the present invention, a cooling fluid passage is provided from below the central portion of the stator to the vicinity of the upper surface in the housing through the central portion and the cooling fluid passes through the lower surface of the housing. Or an opening through which a cooling fluid passes is formed on the upper surface of the casing while providing a cooling fluid passage extending from above the central portion of the stator to near the lower surface in the casing through the central portion. Since the cooling fluid is supplied into the housing through the cooling fluid passage or the opening and the cooling fluid is discharged from the opening or the passage while contacting the stator, the temperature rise of the stator is suppressed, It has the effects of preventing overheating and deformation of the housing, improving durability and safety, and efficiently performing the stirring function to improve the quality of the stirring liquid.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a partially cutaway front view showing a main part of another embodiment. (1a) …… Case (2) …… Stator (3) …… Rotor (5) …… Ventilation path (8) …… Opening

Claims (1)

[Scope of utility model registration request] 1. A housing having a stator inside and a rotor outside, wherein at least a portion facing the rotor is formed of a non-magnetic material, and a portion below the central portion of the stator is passed through the central portion. A cooling fluid passage reaching near the upper surface in the housing is provided, and an opening through which cooling fluid passes is formed in the lower surface of the housing, or a lower surface in the housing from above the central portion of the stator through the central portion. Is provided with a cooling fluid passage extending to the vicinity thereof, and an opening through which the cooling fluid passes is formed on the upper surface of the housing, and a rotary drive device for liquid stirring.