JP7193837B2 - mixer - Google Patents

Description

TECHNICAL FIELD The present invention relates to an agitator using an electric device in which a rotor and a rotor driving section for driving the rotor are opposed to each other with a gap therebetween.

Sheet-like wall coverings made of various materials, so-called wallpaper, are applied to walls as interior finishing of buildings. Usually, wallpaper is applied on site by applying paste to the back surface of the wallpaper, and then successively pasting it onto the wall surface. Background Art Conventionally, a wallpaper pasting machine has been used to apply paste to wallpaper. This wallpaper gluing machine is equipped with multiple rolls and glue tubs inside the main body, and while the wall covering materials drawn from the rear part of the main body are fed forward by the various rolls inside, the back surface of the wall covering material comes into contact with the glue rolls in the middle. The paste in the paste tub is applied by moving the

As shown in FIG. 9, a conventional paste liquid preparation apparatus has a rotating shaft 95 with a stirrer 96 mounted thereon, protruding from the bottom surface of a container 94 that holds the paste material and water, and a base at the bottom of the container 94. A stirrer 90 that adjusts the paste by rotating a stirrer 96 of a rotating shaft 95 via a gear 93, a belt or the like with an electric motor 92 arranged inside 91 has already been commercially available.

However, in this conventional agitating device, the shielding effect of the O-ring and rubber packing for shielding is remarkably reduced, and the paste liquid of the object to be agitated leaks out from the shield portion between the rotating shaft penetrating the container and the container. There was a time when I was lost. This is because if the inside of the container dries without being thoroughly washed after use, the shrinkage associated with the drying of the glue adhering to the shield between the rotating shaft and the container will cause the O-ring and rubber packing to shrink, resulting in This is because the paste liquid leaks out from the shrunken shield portion between the container and the container.

Leakage of the paste from the container into the inside of the base interferes with the meshing of gears and belts, causing operational problems. . Therefore, it is also possible to arrange the drive source above the container, but the center of gravity of the device itself becomes high, resulting in a lack of stability. In addition, if the base itself is made heavy in consideration of stability, the device itself becomes heavy together with the drive source above, which may hinder the installation on site. Furthermore, in the mechanism that transmits the rotation of the electric motor to the stirrer via gears and belts, noise during driving increases.

Therefore, the applicant of the present application has proposed a stirrer and an electric device that do not have a rotating shaft penetrating the container (see Patent Documents 1 and 2). These agitators have a turntable that rotates according to the displacement of a rotating magnetic field, and a rotor holder that has a rotating shaft of the turntable. A rotor driving section that generates a rotating magnetic field having a center of rotation on the rotating shaft of the turntable is arranged, and the rotating magnetic field of the rotor driving section rotates the inside of the tub material, thereby rotating the rotating shaft of the holding section.

JP 2007-89249 A Japanese Unexamined Patent Application Publication No. 2018-1113

However, in Patent Literature 1, there is a problem that the device itself becomes heavy because a large number of magnets have to be used. In addition, there is a problem that the apparatus becomes large because the magnet and the coil group must be arranged on a wide surface. Furthermore, since the rotating shaft is provided on the turntable of the rotor holding portion, the rotating shaft may shake during driving, which may cause malfunction or noise. Further, in Patent Documents 1 and 2, when the magnet is driven by the coil group, it is necessary to switch the current flowing through the coil group at high speed, so the resistance and the like generate heat. When used for a long period of time, the heat generation adversely affects the control system, causing it to stop or malfunction.

Advantageous Effects of Invention The present invention makes less noise during driving, less leakage of the liquid to be stirred from the stirring trough, allows the driving portion itself to be made smaller and lighter, and prevents malfunction even when used for a long period of time. The aim is to obtain less stirrers.

A stirrer according to the invention recited in claim 1 comprises a rotor that rotates according to displacement of a rotating magnetic field,
A rotating shaft with this rotor arranged around the axis;
a rotor holding part provided with a stirrer arranged at the upper end of the rotating shaft;
A stirrer comprising an electric motor in which a rotor drive unit that generates a rotating magnetic field having a rotation center on the rotation shaft of the opposing rotor is arranged opposite to the rotor drive unit with a gap therebetween,
a stirring tub portion that holds the object to be stirred inside;
a holding cup portion having an opening formed at a predetermined position on the bottom inside the stirring tub;
The holding cup portion includes a support portion that fits and supports the lower end of the rotating shaft of the rotor holding portion, and an enlarged diameter portion that loosely fits the rotor of the rotor holding portion inside,
The rotor driving portion is arranged on the outer wall of the enlarged diameter portion of the holding cup portion,
The rotor includes a magnet portion in which N poles and S poles are alternately arranged around the axis of the rotating shaft,
The rotor drive section includes a coil section in which a large number of coil groups are concentrically arranged in an annular manner facing the rotor, and controls energization of each of the large number of coil groups to induce and control the rotating magnetic field. and an induced magnetic field control means,
each coil of the coil group is arranged in a direction to generate an induced magnetic field facing the rotor;
further comprising heat dissipation means for diffusing heat generated by rotation of the rotor;
The heat dissipation means is
a thermally conductive bracket disposed on the stirring tub side of the rotor so as to close the opening and having a bearing for fitting the rotating shaft in the center thereof; and a stirring flow is supplied to the thermally conductive bracket. an air-cooling heat sink arranged in the rotor drive unit;
The air-cooling heat sink is arranged on the outer peripheral wall of the coil portion of the rotor drive section, and the air blowing means is a fan arranged behind the rotor drive section. .

In the agitator according to the invention recited in claim 2, the fan recited in claim 1 is opened rearward so that the air supplied by the fan does not mix with the air having heat in the air-cooling heat sink. It is characterized by having an air supply cover that is

The stirrer according to the invention described in claim 3 is the stirrer according to claim 1 or 2, wherein the stirrer includes two stirring blade pieces that stand obliquely upward with respect to the rotating shaft, It is characterized by comprising two small agitating blade pieces that are formed obliquely downward with respect to the rotating shaft and supply an agitating flow to the heat conductive bracket .

INDUSTRIAL APPLICABILITY The present invention provides a stirring apparatus that generates less noise during driving, does not leak the liquid to be stirred from the container, can be made smaller and lighter in weight, and is less likely to malfunction even when used for a long period of time. There is an effect that you can get a chance.

It is a front view explaining the structure of one Example of the stirrer of this invention. FIG. 2 is a plan view of FIG. 1; 2 is a bottom view of FIG. 1; FIG. 2 is a side sectional view of FIG. 1; FIG. It is explanatory drawing which shows the structure of the principal part of FIG. 1, a figure is a front view, b figure is sectional drawing of a figure. FIG. 6 is an explanatory view showing the configuration of the rotor holding portion of FIG. 5 , FIG. a is a front view, and FIG. b is a cross-sectional view of FIG. FIG. 6 is an explanatory diagram illustrating the configuration of a magnet portion of the rotor holding portion of FIG. 5; It is explanatory drawing which shows the structure of the stirrer of FIG. 5, A figure is a top view, b figure is a perspective view, c figure is a front view. It is an explanatory view explaining the composition of the conventional size adjustment device.

In the present invention, a rotating body comprising a rotor that rotates according to the displacement of a rotating magnetic field, a rotating shaft that has the rotor arranged around the axis, and a stirrer that is arranged at the upper end of the rotating shaft. A stirrer equipped with an electric motor in which a child holding part and a rotor driving part for generating a rotating magnetic field having a rotation center on the rotating shaft of the opposing rotor are arranged opposite to each other with a gap therebetween, and the stirrer is provided inside. A stirring tub for holding an object, and a holding cup having an opening formed at a predetermined position in the bottom of the stirring tub, the holding cup being the lower end of the rotating shaft of the rotor holding section. and an enlarged diameter portion for loosely fitting the rotor of the rotor holding portion inside. Equipped with a magnet section in which N poles and S poles are alternately arranged around the axis of the rotating shaft, and a rotor driving section has a coil section in which a large number of coil groups are arranged concentrically with the rotor facing the rotor, and a large number of coil sections. induced magnetic field control means for controlling the energization of each coil group to induce and control the rotating magnetic field, each coil of the coil group being arranged in a direction to generate an induced magnetic field facing the rotor, It further comprises heat dissipation means for diffusing heat generated by the rotation. As a result, the agitator produces less noise during operation, prevents the liquid to be agitated from leaking from the container, can be made smaller in size and lighter in weight, and is less likely to malfunction even when used for a long period of time. can be obtained.

The heat dissipating means of the present invention may be either one that diffuses the heat generated in the rotor driving section from the rotor driving section, or one that diffuses the heat generated in the rotor from the rotor. That is, the heat radiating means is drive heat radiating means comprising an air-cooling heat sink disposed on the outer wall of the rotor driving part and a blowing means for blowing air to the air-cooling heat sink, and the stirrer for supplying a stirring flow to the heat-conducting bracket.

The rotor of the present invention may face the rotating magnetic field of the rotor driving section and rotate according to the displacement of the rotating magnetic field. Therefore, if it can be magnetically attracted, it will rotate according to the displacement of the rotating magnetic field. As a more preferable mode, a magnet section is provided in which N poles and S poles are alternately arranged around the axis of the rotating shaft so as to reduce torque loss according to the displacement of the rotating magnetic field. A magnet that generates a strong magnetic field is preferable from the standpoint of torque.

The rotor holding section of the present invention includes a rotor that rotates according to displacement of a rotating magnetic field, a rotating shaft that rotates around the axis of the rotor, and a stirrer that is disposed at the upper end of the rotating shaft. There is no electrical connection as long as it is provided. Therefore, as a matter of course, there is no risk of electric leakage in the rotor holding portion itself. In addition, since the rotating shaft and stirrer are held in the liquid to be stirred, there is an advantage that noise during driving is small.

Further, the rotor driving unit may be any unit that generates a rotating magnetic field having a center of rotation on the rotating shaft of the facing rotor. It may be arranged in a cylindrical body in the axial direction, and this cylindrical body may be rotated by an electric motor. A coil section in which a large number of coil groups are concentrically arranged in a cylindrical or flat annular shape in a rotor driving section facing the rotor, on the assumption that an electric device with no noise and little noise is obtained; an induced magnetic field control means for controlling energization of each of a large number of coil groups to induce and control a rotating magnetic field, and each coil of the coil group is arranged in a direction to generate an induced magnetic field facing the rotor. .

As this induced magnetic field control means, the power supplied to each coil group may be PWM-controlled. Normal PWM control detects the position of the magnetic field and controls the amount of current flowing through each coil according to the designated number of rotations. As the current waveform, there are rectangular wave driving and sine wave driving, and either driving may be used.

The stirrer of the present invention is a stirrer using an electric motor in which the rotor holding portion and the rotor driving portion are arranged opposite to each other with a gap therebetween. More specifically, it comprises a stirring tub portion for holding the material to be stirred inside, and a holding cup portion having an opening formed at a predetermined position inside the stirring tub portion, and the holding cup portion is provided with the rotor. A supporting portion that fits and supports the lower end of the rotating shaft of the holding portion, and an enlarged diameter portion that loosely fits the rotor of the rotor holding portion inside. A child drive is provided. As a result, there is no possibility that the object to be stirred leaks out of the container that holds the object to be stirred, and there is no fear of malfunction or noise due to the drive of the gear.

The agitating tub portion of the present invention may be anything as long as it holds the material to be agitated inside and does not allow the internal liquid to leak out to the outside. As the holding cup portion of the present invention, it is sufficient that an opening is formed at a predetermined position inside the stirring tub portion. The agitating tub portion and the holding cup portion may be composed of the same container, or may be a combination of respective members. When connecting the respective members, a shield member such as an O-ring or rubber packing can be interposed to sufficiently stop water. In addition, the opening of the holding cup portion is more preferably formed substantially at the central portion of the bottom portion inside the stirring tub, so that the stirring by the rotation of the stirrer can be efficiently performed.

The holding cup portion includes a supporting portion that fits and supports the lower end of the rotating shaft of the rotor holding portion, and an enlarged diameter portion that loosely fits the rotor of the rotor holding portion. A rotor drive is arranged on the outer wall of the part. As a result, the rotation holding portion having the rotating shaft with the stirrer attached to the upper end portion is immersed in the stirring tub portion and the holding cup portion, that is, in the liquid to be stirred, so that it is held in the liquid to be stirred. Therefore, there is little noise during operation.

Further, the rotor driving portion for driving the rotation holding portion is arranged on the outer wall of the enlarged diameter portion of the holding cup portion, and for driving the rotor inside the enlarged diameter portion of the holding cup portion, the rotor and the rotor driving portion are arranged. The parts can be made smaller, and the weight can be reduced. More preferably, the rotor includes a magnet section in which north poles and south poles are alternately arranged around the axis of the rotating shaft, and the rotor drive section has a large number of coil groups concentrically opposed to the rotor. In the case of providing a cylindrically arranged coil portion and an induced magnetic field control means for inducing and controlling the rotating magnetic field by controlling the energization of each of a large number of coil groups, the coil is large enough to substantially cover the holding cup portion. The drive part is formed by the height. Therefore, it is possible to make the drive unit itself small and light.

In addition, regarding the distance between the coil group of the rotor driving part arranged on the outer wall of the enlarged diameter part of the holding cup part and the rotor of the rotor holding part, the magnet part of the rotor is made a strong magnet, and the magnet By increasing the number of (the number of poles), the gap can be set to about 10 mm. However, by making the gap as small as possible, the torque loss is small. For this reason, the stronger the magnet of the rotor, and the smaller the gap between the magnet and the coil of the rotor drive, the smaller the drive system itself, and the lighter and quieter the drive system becomes. go further. Therefore, the gap between the magnet portion and the coil portion is preferably 5 mm or less, more preferably 3 mm or less, and even more preferably 2 mm or less. In the examples described later, in order to integrate the rotor, the magnet portion was covered with a 0.5 mm thick stainless steel plate, and the enlarged diameter portion of the holding cup portion with a thickness of 0.5 mm was separated by a gap of 1 mm or less. It is separated from the coil group of the rotor drive section by the wall surface of the rotor drive section, and the gap between the coil section of the rotor drive section is 2 mm or less.

Since the wall of the enlarged diameter portion of the holding cup portion is exposed to the rotating magnetic field, it is likely to be heated. Therefore, the holding cup portion is preferably constructed of a heat-resistant material. In addition, considering the gap between the magnet section and the rotor drive section, it is preferable that the thickness of the cup near the rotor drive section is thin. From this point of view, the holding cup portion is preferably made of a heat-resistant resin or a metal through which a magnetic field can easily pass. Specifically, super engineering plastics such as polyethersulfone (PES) and polyphenylene sulfide (PPS), engineering plastics such as polyamide (PA) and polycarbonate (PC), heat-resistant resins such as glass fiber reinforced plastics, Alloys such as stainless steel and aluminum can be mentioned.

The stirrer of the present invention may be any one that mixes the material to be stirred held in the stirring tub by rotation. It refers to a plurality of plate-like or rod-like members arranged evenly around a rotating shaft. The plate-like member includes those arranged horizontally, vertically, obliquely, or curved with respect to the direction of rotation, and includes those with bent tip portions. The rod-like member includes those arranged perpendicularly or obliquely to the axis of rotation, and includes those with bent tip portions. In particular, the stirrer is formed obliquely downward with respect to the rotating shaft for supplying the stirring flow to the heat-conducting bracket, in addition to the two stirring blade pieces standing obliquely upward with respect to the rotating shaft. By providing the two small stirring blade pieces, the heat generated in the rotor can be well diffused from the rotor.

The object to be stirred by the stirrer of the present invention ranges from powders and granules that generally have little risk of leaking to liquids that usually require various measures to prevent leakage. can handle things. In particular, even when water is mixed with a paste material that solidifies when dried and causes various problems, it is necessary to use an O-ring or rubber packing that shrinks violently when the paste dries and impairs the shielding ability. Therefore, there is no risk of leakage of the internal liquid to the outside of the stirring tub.

In this case, the paste includes not only starch paste but also synthetic resin adhesive such as vinyl acetate resin or acrylic resin adhesive that can be dissolved and adjusted in water like starch paste. In addition, it also includes a mixture of two or more types.

Preferably, the induced magnetic field control means of the present invention controls the rotating speed of the rotor at a low speed or intermittently drives the rotor at the beginning of stirring. This is because, depending on the shape of the stirrer and the amount of glue dissolved in water, if the mixture is stirred at a high rotation speed in the initial stage of stirring, the mixture may be violently stirred and the glue and water may fly out of the stirring tub. That is, since the paste material is hardly dissolved in water at the beginning of agitation, its viscosity is low and it is not possible to rotate it at high speed. and water from jumping out of the agitation tub.

In the electric motor of the present invention, as described above, since the rotor holding portion itself is held in the liquid to be stirred, there is little noise during driving. The liquid to be stirred is less likely to leak from the Further, since the driving portion is formed with a size that substantially covers the holding cup portion, the driving portion itself can be made smaller and lighter. Furthermore, since the electric system itself can be arranged outside the liquid to be stirred, there is no risk of electric leakage, and the apparatus can be used without any problem even in high humidity and underwater. Therefore, it is suitable as a drive system for a stirrer.

FIG. 1 is a front view for explaining the configuration of one embodiment of the stirrer of the present invention. 2 is a plan view of FIG. 1. FIG. 3 is a bottom view of FIG. 1. FIG. 4 is a side sectional view of FIG. 1. FIG. 5A and 5B are explanatory diagrams showing the configuration of the main part of FIG. 1, where a is a front view and b is a cross-sectional view of a. 6A and 6B are explanatory diagrams showing the configuration of the rotor holding portion of FIG. 5, where a is a front view and b is a sectional view of a. 7A and 7B are explanatory views for explaining the configuration of the magnet portion of the rotor holding portion of FIG. 5. FIG. 8A and 8B are explanatory diagrams showing the structure of the stirrer in FIG. 5, where a is a plan view, b is a perspective view, and c is a front view.

As shown in FIGS. 1 to 8, the agitator 10 of this embodiment is roughly divided into a plastic agitation tub portion 11 that holds water and a paste material inside, and a agitation tub portion 11 that abuts on the bottom surface of the agitation tub portion 11. and a base 21 for supporting it. A base 21 is movably supported by four casters 22 arranged in the front, rear, left, and right directions.

An opening portion 34 of the holding cup portion 31 is attached so as to close a through hole formed in the central portion of the bottom portion of the stirring tub portion 11 . A rotor holding portion 41 is detachably inserted into the holding cup portion 31 . A dish-shaped heat-conducting bracket 44 is attached to the rotor holding portion 41 so as to close the opening 34 . Below the heat-conducting bracket 44 are a rotor 42 that rotates according to the displacement of the rotating magnetic field, a rotating shaft 43 around which the rotor 42 is arranged, and an upper end of the rotating shaft 43. A stirrer 49 is provided.

As shown in FIG. 6, the rotor 42 is composed of magnet portions 45 in which N poles and S poles are alternately arranged around the axis of a rotating shaft 43. The outer circumference of these magnet portions 45 integrates the individual magnet portions 45. It is covered with a stainless steel plate 46 having a thickness of 0.5 mm in order to A communication hole 47 is formed in the axial center of the rotary shaft 43 from the upper end to the lower end. The communicating hole 47 allows the liquid to be stirred to flow from the lower end to the upper end, thereby facilitating attachment and detachment.

The holding cup portion 31 includes a support portion 32 that rotatably fits and supports the lower end portion of the rotating shaft 43 of the rotor holding portion 41, and an enlarged diameter portion 33 that loosely fits the rotor 42 of the rotation holding portion 41 therein. , and a heat-conducting bracket 44 forming an opening 34 to the stirring tub 11 . A fluorine-based sleeve bearing 44a as a first bearing fitted to the rotating shaft 43 is attached to the central portion of the heat-conducting bracket 44 . Further, a fluorine-based sleeve bearing 48 as a second bearing is fitted to the rotary shaft 43 at the boundary between the expanded diameter portion 33 and the support portion 32 . Incidentally, the length of the lower end of the rotating shaft 43 is formed longer than the length of the rotor. This is because when the rotor holding portion 41 is mounted through the opening 34, the rotor having the magnet portion is inserted into the enlarged diameter portion after the lower end of the rotating shaft 43 reaches the support portion 32 of the holding cup portion 31. There is an advantage that it is easy to install.

A cylindrical rotor driving portion 51 is arranged on the outer wall of the enlarged diameter portion 33 of the holding cup portion 31 inside the base 21 . At the upper end of the rotor driving portion 51, a pressing piece 52 is arranged to sandwich the periphery of the opening of the stirring tub portion 11 via the heat conductive bracket 44 and the packing 35 of the holding cup portion 31, and below the pressing piece 52. A coil portion 53 in which a large number of coil groups are concentrically arranged in a cylindrical shape is arranged facing the rotor. An induced magnetic field control means for controlling energization of each of the many coil groups of the coil section 53 to induce and control the rotating magnetic field is arranged on the control board 24 of the base 21 . Heat generated by the rotor 42 is diffused well from the rotor 42 to the agitation tub portion 11 by the heat conductive bracket 44 .

An air-cooling heat sink 54 for heat radiation is arranged on the outer peripheral wall of the coil portion 53 of the rotor driving portion 51 . Air is supplied to the air-cooling heat sink 54 by a fan 55 arranged behind the rotor drive unit 51 of the base 21, and the air supplied by the fan 55 is heated by the heat sink 54. An air supply cover 56 opened to the rear of the base 21 is provided to prevent mixing.

The induction magnetic field control means of the control panel 24 sequentially changes the polarity of the generated magnetic field by PWM-controlling the power supplied to the individual coil groups of the coil section 53 of the rotor driving section 51 and sequentially switching the polarity. . The sequentially displaced rotating magnetic field causes magnetic attraction and repulsion to act on the individual magnet portions 45 of the rotor 42 , thereby rotating the rotor 42 . Rotation of the rotor 42 rotates the rotating shaft 43 and the stirrer 49 to stir the paste material and water inside the stirring tub portion 11 . Initially, the coil group was driven with a current of 1.7 A, but if the current is set to 2.5 A in order to increase the rotation output of the rotor, the control system will be damaged by the heat generated during long-term use. may have an adverse effect on the device, causing it to stop or malfunction. Since the heat sink 54 and the fan 55 are provided, malfunctions do not occur even after long hours of use.

The stirrer 10 of this embodiment is controlled by the induced magnetic field control means of the control panel 24 so that the stirring speed is changed between the initial stage of stirring and the later stage of stirring. That is, control is performed so that the rotation speed of the stirring blade at the beginning of stirring is set to 300 rpm, and after stirring for one and a half minutes, the speed is increased to 800 rpm over one and a half minutes. This is because the paste material is not completely dissolved in the water at the beginning of the stirring, so by gently stirring the water is prevented from jumping out of the stirring tub 11 due to the rotation of the stirrer, and the paste dissolves in the water at the later stage of the stirring. As a result, the viscosity is increased, so the number of revolutions can be increased.

A gap between the magnet portion 45 of the rotor 42 and the coil portion of the rotor driving portion 51 is 2 mm or less. That is, in order to integrate the rotor 42, the magnet portion 45 is covered with a 0.5 mm thick stainless steel plate 46, and then the enlarged diameter portion 33 of the 0.5 mm thick holding cup portion 31 is separated with a gap of 1 mm or less. It is separated from the coil group of the rotor driving section 51 by the wall surface, and the gap with the coil section of the rotor driving section 51 is 2 mm or less.

The stirrer 49 of this embodiment has a horizontal disc 49a perpendicular to the rotating shaft 43, and is bent at an angle of 120° with an angle of 10° with respect to the circumference of the disc. Two stirring blade pieces 49b with a plate thickness of 2 mm having a long blade part stand up and are also bent at an angle of -143 ° with an angle of 10 ° with respect to the circumference of the disk 51 mm and a tip blade portion of 20 mm bent at 90° with respect to the intermediate blade portion. The stirrer blades 49c allow the heat-conducting bracket to be supplied with a stirrer flow.

Even if the number of revolutions of the stirring blades at the beginning of stirring is set to 300 rpm, the stirring element 49 has a size of about 42 cm and a height of about 43 cm. 18 kg and 10 kg to 18 kg of water were added, the liquid to be stirred did not jump out of the stirring tub 11, and it was confirmed that no air was caught even at 800 rpm after one and a half minutes.

A pump 25 is provided inside the base 21, and the stirred liquid is extracted from the discharge port 12 drilled in the bottom surface of the stirring tub 11 by a hose 26 and supplied to the outside of the device 10. be able to. A perforated plate 13 is arranged at the discharge port 12, and large particles and the like are filtered by the perforated plate 13. - 特許庁

As described above, since the rotor holding portion 41 itself is held in the liquid to be stirred, the noise during driving is small, and since the rotating shaft 43 itself does not penetrate the stirring vat portion 11 , the stirring vat portion 11 does not pass through the stirring vat portion 11 . Less liquid leaks. In addition, since the driving portion is formed with a size that substantially covers the holding cup portion 31, the driving portion itself can be made smaller and lighter. Furthermore, since the electric system itself can be arranged only inside the base 21, there is no fear of electric leakage, and it can be used without any problems even in high humidity and underwater. Therefore, it is suitable as a drive system for the stirrer 10 .

10... Stirrer,
11 ... stirring tub part,
12 ... discharge port,
13... Perforated plate,
21 ... base,
22 ... Caster,
23... operation panel,
24... Control panel,
25 ... pump,
26... Hose,
31... Holding cup portion,
32 ... support part,
33 ... enlarged diameter portion,
34 ... opening,
35 packing,
41... Rotor holding part,
42 ... Rotor,
43 ... rotating shaft,
44 ... thermally conductive bracket,
44a ... sleeve bearing (first bearing),
45 ... magnet part,
46... Stainless plate,
47 ... communication hole,
48 ... sleeve bearing (second bearing),
49 ... Stirrer,
49a...horizontal disk,
49b ... stirring blade piece,
49c... Stirrer blade piece,
51 ... Rotor drive unit,
52... Pressing piece,
53... Coil part,
54 ... Heat sink for air cooling,
55 Fans,
56 ... air supply cover,

Claims (3)

a rotor that rotates according to the displacement of the rotating magnetic field;
A rotating shaft with this rotor arranged around the axis;
a rotor holding part provided with a stirrer arranged at the upper end of the rotating shaft;
A stirrer comprising an electric motor in which a rotor drive unit that generates a rotating magnetic field having a rotation center on the rotation shaft of the opposing rotor is arranged opposite to the rotor drive unit with a gap therebetween,
a stirring tub portion that holds the object to be stirred inside;
a holding cup portion having an opening formed at a predetermined position on the bottom inside the stirring tub;
The holding cup portion includes a support portion that fits and supports the lower end of the rotating shaft of the rotor holding portion, and an enlarged diameter portion that loosely fits the rotor of the rotor holding portion inside,
The rotor driving portion is arranged on the outer wall of the enlarged diameter portion of the holding cup portion,
The rotor includes a magnet portion in which N poles and S poles are alternately arranged around the axis of the rotating shaft,
The rotor drive section includes a coil section in which a large number of coil groups are concentrically arranged in an annular manner facing the rotor, and controls energization of each of the large number of coil groups to induce and control the rotating magnetic field. and an induced magnetic field control means,
each coil of the coil group is arranged in a direction to generate an induced magnetic field facing the rotor;
further comprising heat dissipation means for diffusing heat generated by rotation of the rotor;
The heat dissipation means is
a thermally conductive bracket disposed on the stirring tub side of the rotor so as to close the opening and having a bearing for fitting the rotating shaft in the center thereof; and a stirring flow is supplied to the thermally conductive bracket. an air-cooling heat sink arranged in the rotor drive unit;
The agitator according to claim 1, wherein the air-cooling heat sink is arranged on the outer peripheral wall of the coil portion of the rotor drive section, and the air blowing means is a fan arranged behind the rotor drive section. 2. The fan according to claim 1 , wherein the fan has an air supply cover that opens rearward so that air supplied by the fan does not mix with air heated by the air-cooling heat sink. agitator. The stirrer includes two stirring blade pieces that stand obliquely upward with respect to the rotating shaft, and is formed obliquely downward with respect to the rotating shaft to supply a stirring flow to the heat conductive bracket 2. 3. A stirrer according to claim 1 or 2 , characterized in that it comprises a single stirring blade.

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