JPH10314569A - Stirrer - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce friction accompanying transmission of rotational force and to ensure smooth and stable rotation of a stirrer. A stirring device includes a power unit and a stirring tank mounted on the power unit. A stirring element is rotatable in a recess formed in a bottom of the stirring tank. It is stored in. The power unit 6 includes a casing 7, a motor 8 housed in the casing 7, and power transmission means 9 driven to rotate by the motor 8. The concave portion 3 of the stirring tank 2 is fitted into a concave portion 71 at an upper portion of the casing 7. The power transmission means 9 includes a support member 91 and a plurality of permanent magnets 92 supported by the support member 91. Stirrer 5
Has a plurality of permanent magnets 51, a curved bottom 52, and a stirring blade 53. Each permanent magnet 51 is attracted by the corresponding permanent magnet 92 in a direction (radially outward) orthogonal to the rotation axis of the stirrer 5, and the rotational force is transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirrer, and more particularly to a stirrer suitable to be applied to a washing apparatus for washing an object to be washed by a liquid flow.

[0002]

2. Description of the Related Art A magnet stirrer is known as a stirring device for stirring a liquid. This magnet stirrer has a stirrer made of a rod-shaped magnetic material put in a stirring tank in which a liquid is stored, a motor installed outside the stirring tank, and is rotationally driven by the motor, and its rotational force is contactless. Power transmission means for transmitting the rotation to the stirrer and rotating the stirrer. In this case, the power transmission means has a permanent magnet, attracts the stirrer through the bottom of the stirring tank by its magnetic force, and transmits a rotational force to the stirrer.

However, in such a magnetic stirrer, the permanent magnet outside the stirring tank adsorbs the stirrer through the bottom of the stirring tank, so that the stirrer rotates while being pressed against the inner bottom surface of the stirring tank. Therefore, the large frictional force is generated, and the loss of the rotational force transmitted to the stirrer is large.

Therefore, when the output of the motor is fixed,
The stirring bar rotates at a higher speed and cannot be stirred.
In particular, when used as a cleaning device, there is a limit to the increase in the number of revolutions of the stirrer, and there is a problem that cleaning efficiency is poor.

In this case, if the rotation speed of the motor is increased to force the stirrer to rotate at a high speed, the rotation of the stirrer becomes unstable, and the stirrer extremely rotates eccentrically or dances. Therefore, conversely, the stirring efficiency and the cleaning efficiency are reduced.

Further, when the stirrer rotates while being pressed against the inner bottom surface of the stirrer, there is another problem that the resin coating the stirrer is shaved or worn, and the abrasion powder is mixed into the liquid.

Further, when a high-output motor is used to obtain a high rotation of the stirrer, not only the generation of vibration and noise becomes remarkable, but also the size of the motor becomes large, the whole apparatus becomes large, and the manufacturing cost is reduced. There was also a problem of increasing.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a stirrer capable of reducing friction caused by transmission of rotational force, ensuring stable rotation of a stirrer, and increasing its rotational speed. Is to do.

[0009]

This and other objects are achieved by the present invention which is defined below as (1) to (12).

(1) A stirring tank for storing a liquid, a stirrer rotatably installed on the inner bottom of the stirring tank and having a permanent magnet or a ferromagnetic material on the outer periphery thereof, and installed outside the stirring tank. And a power transmission means for transmitting energy generated by the power source to the stirrer in a non-contact manner to rotate the stirrer, wherein the power transmission means comprises a stirrer. A stirrer comprising an induction magnet capable of attracting the permanent magnet or ferromagnetic material in a direction perpendicular to the rotation axis of the agitator.

(2) The stirrer according to the above (1), further comprising a guide portion for suppressing eccentric rotation of the stirrer.

(3) The stirring device according to the above (1) or (2), wherein the induction magnet is a permanent magnet rotated by the power source.

(4) The stirring device according to (1) or (2), wherein the induction magnet is an electromagnet.

(5) a stirring tank for storing a liquid, and a rotatably inserted into a recess formed at the bottom of the stirring tank;
A stirrer provided with at least one pole permanent magnet on the outer periphery thereof, a motor provided outside the stirring tank, and rotationally driven by the motor, and transmitting the rotational force to the stirrer in a non-contact manner. And a power transmission means for rotating the stirrer, wherein the power transmission means includes a permanent magnet capable of attracting the permanent magnet in a direction orthogonal to a rotation axis of the stirrer. A stirring device characterized by the above-mentioned.

(6) The stirrer according to the above (5), wherein at least one of the permanent magnet on the side of the stirrer and the permanent magnet on the side of the power transmission means is a multi-pole magnetized ring-shaped permanent magnet.

(7) The stirrer according to any one of the above (1) to (6), wherein the lower part of the stirrer has a structure in which the lower part of the stirrer contacts the inner surface of the stirrer tank.

(8) The above-mentioned (1), wherein the portion of the stirrer that comes into contact with the inner surface of the stirring tank is made of a low-friction material.
The stirrer according to any one of (1) to (7).

(9) The stirrer according to any one of the above (1) to (8), wherein the stirrer has a stirring blade.

(10) The stirrer according to any one of (1) to (9), wherein a partition member through which the liquid can flow is installed above the stirrer.

(11) The stirrer according to any one of (1) to (10), wherein an air introduction path for introducing air into the vicinity of the stirrer is provided in the stirring tank.

(12) The stirring device according to any one of (1) to (11), wherein the liquid is a cleaning liquid.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a stirrer according to the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

FIG. 1 is a sectional side view showing an embodiment of the stirring device of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG.
As shown in these figures, the stirrer 1 of the present invention includes a power unit 6, a stirrer 2 placed on top of the power unit 6, and a stirrer 5 rotatably installed at the bottom inside the stirrer 2. have.

The upper portion of the stirring tank 2 for storing the liquid Q is covered by a lid 4. The lid 4 has a function of preventing the liquid Q from leaking or scattering during stirring.

A recess 3 is formed at the bottom of the stirring tank 2 so as to be recessed downward in FIG. A stirrer 5 described below is rotatably accommodated in the recess 3.

The inner diameter of the recess 3 is set to a value slightly larger than the outer diameter of the stirrer 5. Thereby, the side wall 32 of the concave portion 3 forms a guide portion for suppressing the eccentric rotation of the stirrer 5.

At least the concave portion 3 of the stirring tank 2 is made of a non-magnetic material such as a resin material.

The power unit 6 has a casing 7, a motor (power source) 8 housed in the casing 7, and is driven to rotate by the motor 8.
And a power transmission means 9 for transmitting the rotation to the agitator 5.

In the upper part of the casing 7, a recess 71 into which the recess 3 of the stirring tank 2 can be fitted is formed. Then, the stirring tank 2 is installed so that the recess 3 of the stirring tank 2 fits into the recess 71.

At least the concave portion 71 of the casing 7 is made of a non-magnetic material such as a resin material.

The power transmission means 9 includes a rotating shaft 81 of the motor 8.
A support member (magnet holder) 91 fixed to
A plurality (4 in this embodiment) supported by this support member 91
) Permanent magnets (induction magnets) 92.

Each permanent magnet 92 is connected to a rotating shaft 81 of the motor 8.
When the motor 8 is driven, the outer periphery of the concave portion 71 rotates in a non-contact manner with the outer peripheral surface of the concave portion 71 when the motor 8 is driven. In this case, the rotation speed of each permanent magnet 92 is, for example, about 2800 to 6400 rpm.

Each permanent magnet 92 may be of any type, such as a ferrite magnet, an alnico magnet, a rare earth magnet, etc., but a rare earth magnet such as an Sm-Co system or a rare earth-transition metal-B system having excellent magnetic properties is used. Is preferred. Also,
It is preferable that the magnetic force (magnetic characteristics) of each permanent magnet 92 is substantially the same.

A plurality of stirrers 5 (four in this embodiment) are arranged below the stirrers 5 so as to correspond to the respective permanent magnets 92.
(See FIG. 2). In this case, each of the permanent magnets 51 has substantially the same installation height (the vertical position in FIG. 1) as each of the permanent magnets 92, and is arranged in a horizontal direction. Thereby, each permanent magnet 51
Is attracted by the corresponding permanent magnet 92 in a direction (radial direction) orthogonal to the rotation axis of the stirrer 5.

The installation height of each permanent magnet 92 is
1 may be set slightly higher than the installation height. In this case, the attraction force of each permanent magnet 92 exerts a force to lift the stirrer 5 upward, and the bottom 52 and the recess 3
The contact pressure with the bottom inner surface 31 is further reduced, and the frictional force associated with the rotation of the stirrer 5 can be further reduced.

Each of the permanent magnets 51 may be any one of a ferrite magnet, an alnico magnet, a rare earth magnet and the like, but a rare earth magnet such as an Sm-Co based or a rare earth-transition metal-boron (B) based having excellent magnetic properties. It is preferable to use Further, it is preferable that the magnetic force (magnetic characteristics) of each permanent magnet 51 be substantially the same.

In order to avoid a reaction with the liquid Q in the stirring tank 2, the surface of each permanent magnet 51 is preferably coated with a resin or the like.

The shape of each of the permanent magnets 51 and 92 is not limited to a block shape as shown in FIG.
Any shape such as a tile shape (arc shape) and a bar shape may be used.

Each of the permanent magnets 51 may be made of a ferromagnetic material such as iron or cobalt as long as a sufficient attractive force can be obtained by each of the permanent magnets 92.

The bottom 52 of the stirrer 5 has a curved surface, and has a structure in which the bottom 52 of the stirring tank 2 is in point contact with the inner surface 31 of the bottom of the recess 3 at substantially the center. Thereby, the frictional resistance accompanying the rotation of the stirrer 5 is greatly reduced,
Can be rotated at a higher speed. Further, since no abrasion powder is generated, an adverse effect due to the abrasion powder entering the liquid Q can be prevented.

The bottom 52 of the stirrer 5 is preferably made of a low friction material. Examples of the low friction material include various resin materials such as polytetrafluoroethylene, polyester, polyphenylene sulfide, polyacetal, and polyamide, and various ceramics such as alumina,
A metal material such as stainless steel is used.

Unlike the illustration, the stirrer 5 may be installed rotatably with respect to the center of the bottom of the recess 3 via a shaft member such as a pin. In this case, the shaft member may be formed on the stirring bar 5 side, or may be formed on the bottom side of the recess 3.

On the top of the stirrer 5, four stirring blades 53 are installed in a cross shape. Thereby, the stirring efficiency when the stirrer 5 rotates is improved. At least the upper portion of the stirring blade 53 projects upward from the bottom surface 21 of the stirring tank 2.

It is needless to say that the shape, the installation position, the number of the stirring blades 53 and the like are not limited to those shown in the drawings.

A partition member 10 through which the liquid Q can flow is provided above the stirrer 5 in the stirring tank 2 with a support member 11.
It is supported by and installed. This partition member 10
As, for example, a mesh, a net-like net,
Examples include a frame body and a plate having a large number of holes.

The provision of the partition member 10 ensures that the liquid Q is sufficiently stirred and that, for example, the object to be cleaned placed in the stirring tank 2 comes into contact with the rotating stirrer 5.
Collision is prevented.

The partition member 10 also has a function of preventing the stirrer 5 from jumping out of the recess 3.

The above-described stirrer 1 generates a liquid flow by rotating the stirrer 5 and stirs the liquid Q in the stirrer tank 2. Glasses, jewelry, parts for industrial products, other various metal products,
It is preferable to apply the present invention to a cleaning apparatus in which an object to be cleaned such as a ceramic product is placed and the object is cleaned by a liquid flow. In this case, the liquid Q is a cleaning liquid having a predetermined composition.

Next, the operation of the stirring device 1 will be described. When the motor 8 is energized and operated in the state shown in FIG. 1, each permanent magnet 92 rotates together with the support member 91.
Each of the permanent magnets 92 attracts the corresponding permanent magnet 51 radially outward through the side wall of the concave portion 71 and the side wall 32 of the concave portion 3 due to the magnetic force. The rotational force is transmitted to the stirrer 5 in a non-contact manner, and the stirrer 5 rotates in the same direction.

At this time, the four permanent magnets 51 are each attracted radially outward with substantially equal forces, so that the total radial force received by the stirrer 5 is substantially zero. Further, the bottom 52 of the stirrer 5 is in point contact with the inner surface 31 of the bottom of the recess 3 and the contact pressure is small, so that the frictional resistance accompanying the rotation of the stirrer 5 is small. Further, the stirrer 5 is restricted from moving in the radial direction by the side wall 32 of the recess 3. For this reason, the stirrer 5 rotates smoothly and stably with low friction, eccentric rotation is suppressed, and therefore, the stirrer 5 can rotate at higher rotation.

When the stirrer 5 rotates, a liquid flow, in particular, a vortex around the rotation axis of the stirrer 5 is formed by the action of the blades 53, and the liquid Q in the stirring tank 2 is uniformly stirred. When an object to be cleaned is contained in the liquid Q in the stirring tank 2, cleaning is performed by the liquid flow of the liquid Q.

The rotation of the stirrer 5 is high (for example, 2
(About 800 to 6400 rpm), a negative pressure is formed above the center of rotation of the stirrer 5, and a liquid flow (eddy flow) accompanied by entrainment of bubbles is generated. In this case, the stirring effect and the cleaning effect are further enhanced, and uniform stirring and cleaning can be performed in a shorter time.

FIG. 3 is a cross-sectional view showing another embodiment of the stirring device of the present invention. The stirrer shown in FIG.
The permanent magnet on the power transmission means 9 side and the permanent magnet on the power transmission means 9 side are constituted by ring-shaped permanent magnets 54 and 93 which are magnetized in a multipolar manner.
In this case, the permanent magnet 54 and the permanent magnet 93 have the same number of poles.

According to such a configuration, both permanent magnets 5
4, 4 and 93 have a large area facing each other in the circumferential direction, so that a larger rotational force can be transmitted to the stirrer 5, which contributes to further high-speed rotation of the stirrer 5.

FIG. 4 is a cross sectional view showing another embodiment of the stirring device of the present invention. The stirrer shown in FIG.
Ring-shaped permanent magnet 55 multi-polarized on the permanent magnet on the side
And the same as the stirring device 1 except that the configuration of the power transmission means is different.

That is, the power transmission means in the present embodiment is constituted by a stator core 95 having six magnetic poles 96, and energized by a coil (power source) 97 wound around each magnetic pole 96, whereby an electromagnet (induction magnet) is provided. And attracts the corresponding pole of the permanent magnet 55 of the stirrer 5 in a direction orthogonal to the rotation axis of the stirrer 5 (radially outward) by the magnetic force generated by the electromagnet.

In this case, the stirrer 5 can be rotated by inverting the polarity of each magnetic pole 96 by switching the direction of current supply to each coil 97 at a predetermined cycle.

According to such a configuration, the power unit 6
Since there is no rotating part on the side, vibration and noise are reduced,
Further, the loss of energy is small, and the stirrer 5 can be rotated at a higher speed.

FIG. 5 is a cross sectional view showing another embodiment of the stirring device of the present invention. The stirrer 1 shown in FIG. 1 is the same as the embodiment shown in FIG. 1 and the like, except that an air introduction path is provided in the stirring tank 2.

A tube (tube) 12 is provided along the inner surface of the side wall of the stirring tank 2. The lumen of the tube 12 forms an air introduction passage. One end (upper end) of the tube 12 is installed at a predetermined position above the liquid level of the liquid Q, and the other end of the tube 12 passes through the lower part of the partition member 10 to near the upper part of the rotation center of the stirrer 5. Has been extended.

As described above, when the stirrer 5 rotates at a high speed, a negative pressure is generated above the rotation center of the stirrer 5. Due to this negative pressure, air is sucked and transferred through the air introduction path of the tube 12 and is introduced above the rotation center of the stirrer 5. The introduced air becomes bubbles due to the eddy flow generated in that portion and is dispersed in the liquid.

As described above, a liquid flow accompanied by bubbles (vortex flow)
Since the stirring effect and the washing effect are further enhanced, uniform stirring and washing can be performed in a shorter time.

Although the agitator according to the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to these embodiments, and each component of the present invention may have any function capable of exhibiting the same function. Can be replaced with the one having the configuration described above.

For example, in each of the above embodiments, the power transmission means is provided on the outer peripheral side of the stirrer and includes a magnet for attracting the stirrer to the outside in the radial direction. May be located on the inner peripheral side of the stirrer and suck the stirrer inward in the radial direction (direction toward the center of rotation).

[0065]

As described above, according to the stirrer of the present invention, the friction accompanying the transmission of the rotational force can be reduced, and the stirrer can be rotated smoothly and stably. This allows
The rotation speed of the stirrer can be increased. for that reason,
The stirring efficiency is improved, and especially when applied to a cleaning device, the cleaning efficiency is significantly improved.

In particular, a high-speed rotation of the stirrer can be obtained with a small motor (power source) and a low-output motor (power source).
This contributes to downsizing of the device and also reduces the generation of vibration and noise.

The agitator of the present invention has a simple structure, is inexpensive to manufacture, and is very simple to operate.

[Brief description of the drawings]

FIG. 1 is a sectional side view showing an embodiment of the stirring device of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a cross-sectional view showing another embodiment of the stirring device of the present invention.

FIG. 4 is a transverse sectional view showing another embodiment of the stirring device of the present invention.

FIG. 5 is a sectional side view showing another embodiment of the stirring device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stirrer 2 Stirring tank 21 Bottom surface 3 Concave part 31 Bottom inner surface 32 Side wall 4 Cover 5 Stirrer 51 Permanent magnet 52 Bottom 53 Stirrer blade 54, 55 Permanent magnet 6 Power unit 7 Casing 71 Recessed part 8 Motor 81 Rotary shaft 9 Power transmission means 91 Support member 92, 93 Permanent magnet 95 Stator core 96 Magnetic pole 97 Coil 10 Partition member 11 Support member 12 Tube

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiaki Akimoto 81 Okumacho, Tsuzuki-ku, Yokohama-shi, Kanagawa Prefecture Inside Akimoto Giken (72) Inventor Osamu Nagayama 6-23-2 Nishigotanda, Shinagawa-ku, Tokyo Japan Electron Inside the corporation

Claims (12)

[Claims] An agitating tank for storing a liquid, a stirrer rotatably installed at an inner bottom of the agitating tank and having a permanent magnet or a ferromagnetic material on an outer peripheral portion thereof, and an agitator installed outside the agitating tank. A power source, and a power transmission means for rotating the agitator by transmitting energy generated by the power source to the agitator in a non-contact manner, wherein the power transmission means is A stirrer comprising an induction magnet capable of attracting the permanent magnet or ferromagnetic material in a direction perpendicular to a rotation axis. 2. The stirrer according to claim 1, further comprising a guide portion for suppressing eccentric rotation of the stirrer. 3. The stirrer according to claim 1, wherein the induction magnet is a permanent magnet rotated by the power source. 4. The induction magnet according to claim 1, wherein the induction magnet is an electromagnet.
Or the stirrer according to 2. 5. A stirrer for storing a liquid, a stirrer rotatably inserted into a recess formed in the bottom of the stirrer, and having at least one permanent magnet installed on an outer peripheral portion thereof, A stirrer having a motor installed outside the stirring tank and a power transmission unit that is driven to rotate by the motor and transmits the rotational force to the stirrer in a non-contact manner to rotate the stirrer, The stirrer according to claim 1, wherein the power transmission means includes a permanent magnet capable of attracting the permanent magnet in a direction orthogonal to a rotation axis of the stirrer. 6. The stirrer according to claim 5, wherein at least one of the stirrer-side permanent magnet and the power transmission means-side permanent magnet is a multi-pole magnetized ring-shaped permanent magnet. 7. The stirrer according to claim 1, wherein a lower portion of the stirrer has a structure that makes point contact with an inner surface of the stirrer. 8. A part of the stirrer which is in contact with the inner surface of the stirring tank is made of a low friction material.
The stirrer according to any one of the above. 9. The stirrer according to claim 1, wherein the stirrer has a stirring blade. 10. The stirrer according to claim 1, wherein a partition member through which the liquid can flow is provided above the stirrer. 11. The stirrer according to claim 1, wherein an air introduction path for introducing air into the vicinity of the stirrer is provided in the stirring tank. 12. The stirring device according to claim 1, wherein the liquid is a cleaning liquid.