JP7052993B2 - mixer - Google Patents

Description

The present invention relates to a stirrer using an electric device capable of facing a rotor and a rotor driving unit for driving the rotor with a gap.

As an interior finish of a building, a sheet-shaped wall covering made of various materials, so-called wallpaper, is attached to the wall surface. Normally, in the construction of this wallpaper, glue is applied to the back surface of the wallpaper at the site, and the wallpaper is sequentially attached to the wall surface. Conventionally, a wallpaper gluing machine has been used to apply glue to wallpaper. This wallpaper gluing machine is equipped with multiple rolls and tubs inside the main body, and while sending out the wall covering material drawn from the rear of the main body forward with various internal rolls, the back surface of the wall covering material comes into contact with the gluing roll in the middle. The glue of the glue tub is applied by making it.

As a conventional glue liquid adjusting device, as shown in FIG. 9, a rotating shaft 95 to which a stirrer 96 is attached is projected onto the bottom surface of a container 94 that holds the glue material and water, and a base at the bottom of the container 94. A stirring device 90 for adjusting the glue by rotating the stirring bar 96 of the rotating shaft 95 via a gear 93, a belt, or the like with an electric motor 92 arranged inside the 91 has already been put on the market.

However, in this conventional stirring device, the shielding effect of the shielding O-ring and the rubber packing is remarkably reduced, and the glue liquid of the object to be agitated may leak from the shielded portion between the rotating shaft and the container. there were. This is because when the inside of the container dries without being sufficiently washed after use, the O-ring and rubber packing also shrink due to the shrinkage of the glue liquid adhering to the shield between the rotating shaft and the container, causing the rotating shaft. This is because the glue liquid leaks from the shield portion between the container and the container.

Leakage of the glue liquid from the container to the inside of the base may hinder the meshing of gears and belts, leading to malfunctions, and in the worst case, a short-circuit accident of the electric drive system such as an electric motor. .. Therefore, although it is possible to consider a device in which the drive source is arranged above the container, the center of gravity of the device itself becomes high, which causes a drawback of lacking stability. Further, if the base itself is made heavy in consideration of stability, the device itself becomes heavy in combination with the drive source above, which may hinder the placement at the site. Further, in the mechanism that transmits the rotation of the motor to the stirrer via the gear or the belt, the noise at the time of driving becomes large.

Therefore, the applicant has proposed a stirrer and an electric device without a rotating shaft penetrating the container (see Patent Document 1). In this stirrer, a turntable that rotates according to the displacement of the rotating magnetic field and a rotor holding portion having a rotation axis of the turntable are arranged on the bottom surface of the tub material, and the turn table is turned below the bottom surface of the tub material. A rotor driving unit that generates a rotating magnetic field having a rotation center is arranged on the rotating shaft of the table, and the rotating magnetic field of the rotor driving unit rotates the rotating shaft of the rotor holding portion in the tub.

Japanese Unexamined Patent Publication No. 2007-89249

However, in Patent Document 1, there is a problem that the apparatus itself becomes heavy because a large number of magnets must be used. Further, since the magnet and the coil group have to be arranged on a wide surface, there is a problem that the apparatus becomes large. Further, since the rotating shaft is provided on the turntable of the rotor holding portion, the rotating shaft may be shaken during driving, which may cause a failure or noise.

An object of the present invention is to obtain a stirrer which has less noise during driving, less leakage of liquid to be agitated from the stirring tub, can make the driving part itself smaller, and can be made lighter.

The stirrer according to the invention according to claim 1 has a rotor that rotates according to the displacement of a rotating magnetic field, a rotating shaft in which the rotor is arranged around the axis, and an upper end portion of the rotating shaft. A rotor holder with a stirrer,
It is a stirrer equipped with an electric motor that is arranged so as to face each other with a gap between the rotor drive unit that generates a rotating magnetic field having a rotation center on the rotation axis of the rotor facing each other.
A stirring tub that holds the object to be agitated inside,
A holding cup portion having an opening formed at a predetermined position on the bottom portion inside the stirring tub is provided.
The holding cup portion includes a support portion that fits and supports the lower end portion of the rotation shaft of the rotor holding portion, and a diameter-expanded portion that loosely fits the rotor of the rotor holding portion inward.
The rotor drive unit is arranged on the outer wall of the enlarged diameter portion of the holding cup portion.
The rotor holding portion includes a dish portion that closes the opening of the holding cup portion.
The rotor holding portion has a first bearing fitted to the rotating shaft of the rotor holding portion mounted on the central portion of the dish portion, and the enlarged diameter portion and the supporting portion of the holding cup portion. It is detachably inserted into the holding cup portion by a second bearing fitted to the rotating shaft of the rotor holding portion at the boundary of the rotor.
The rotating shaft of the rotor holding portion is characterized by having a communication hole formed in the shaft center portion from the upper end to the lower end .

The stirrer according to the invention according to claim 2 is provided with a magnet portion in which the rotor according to claim 1 is provided with magnet portions in which N poles and S poles are alternately arranged around the axis of the rotating shaft. It is a feature.

The stirrer according to the invention according to claim 3 is a coil portion in which the rotor driving unit according to claim 1 or 2 has a large number of coil groups concentrically arranged in a tubular shape facing the rotor. And an induced magnetic field control means for inducing and controlling the rotating magnetic field by controlling the energization of each of the large number of coils.
Each coil of the coil group is characterized in that it is arranged in a direction of generating an induced magnetic field facing the rotor.

In the stirrer according to the invention according to claim 4, the induced magnetic field control means according to claim 3 controls the rotation speed of the rotor to be slow or intermittently drives the rotor at the initial stage of stirring. It is characterized by doing.

INDUSTRIAL APPLICABILITY The present invention has the effect that there is less noise during driving, the liquid to be agitated does not leak from the container, the driving unit itself can be made smaller, and a agitator that can be made lighter can be obtained.

It is a front view explaining the structure of one Example of the stirrer of this invention. It is a plan view of FIG. It is a bottom view of FIG. It is a side sectional view of FIG. It is explanatory drawing which shows the structure of the main part of FIG. 1, FIG. a is a front view, and FIG. b is a sectional view of FIG. It is explanatory drawing which shows the structure of the rotor holding part of FIG. 5, a figure is a front view, and b figure is a sectional view of a figure. It is explanatory drawing explaining the structure of the magnet part of the rotor holding part of FIG. 5 is an explanatory view showing the configuration of the stirrer of FIG. 5, where a is a plan view, b is a perspective view, c is a front view, and d is a right side view. It is explanatory drawing explaining the structure of the conventional glue liquid adjusting apparatus.

In the present invention, a rotor holding having a rotor that rotates according to the displacement of the rotating magnetic field, a rotating shaft in which the rotor is arranged around the axis, and a stirrer arranged at the upper end of the rotating shaft. It is a stirrer equipped with an electric motor in which a unit and a rotor drive unit that generates a rotational magnetic field having a rotation center on the rotation axis of the rotor facing each other are arranged so as to face each other with a gap between them. A stirring tub to be held and a holding cup portion having an opening formed at a predetermined position at the bottom of the stirring tub are provided, and the holding cup portion fits the lower end portion of the rotation shaft of the rotor holding portion. A support portion for joint support and a diameter-expanding portion for loosely fitting the rotor of the rotor holding portion are provided, and a rotor driving portion is arranged on the outer wall of the diameter-expanding portion of the holding cup portion. As a result, it is possible to obtain a stirrer that has less noise during driving, does not leak the liquid to be agitated from the container, can make the drive unit itself smaller, and can be made lighter.

The rotor of the present invention may be any as long as it faces the rotating magnetic field of the rotor driving unit and rotates according to the displacement of the rotating magnetic field. Therefore, if it can be magnetically attracted, it rotates according to the displacement of the rotating magnetic field. As a more preferable embodiment, a magnet portion is provided in which N poles and S poles are alternately arranged around the axis of the rotating shaft so that the torque loss corresponding to the displacement of the rotating magnetic field is small. A magnet that generates a strong magnetic field is preferable in terms of torque, and for example, neodymium, a Samakoba-based rare earth magnet, ferrite, or the like is used.

The rotor holding portion of the present invention includes a rotor that rotates according to the displacement of the rotating magnetic field, a rotating shaft in which the rotor is arranged around the axis, and a stirrer arranged at the upper end of the rotating shaft. All you have to do is prepare, and there is no electrical connection. Therefore, as a matter of course, there is no concern about electric leakage in the rotor holding portion itself. Further, since the rotating rotary shaft and the stirrer are held in the liquid to be agitated, there is an advantage that there is less noise during driving.

Further, the rotor drive unit may be any one that generates a rotating magnetic field having a rotation center on the rotation axes of the facing rotors. For example, a large number of permanent magnets having the direction of the magnetic field facing the rotor may be arranged in the cylindrical body in the direction of the axis of rotation, and the cylindrical body may be rotated by an electric motor, but more preferably, the rotor is driven. The unit is provided with a coil unit in which a large number of coil groups are concentrically arranged in a tubular shape facing the rotor, and an induced magnetic field control means for controlling the energization of each of the large number of coil groups to induce and control the rotating magnetic field. , Each coil of the coil group is arranged in a direction to generate an induced magnetic field facing the rotor. As a result, since the rotating drive system does not substantially exist in the rotor drive unit, there is no noise in the rotor drive unit itself, and it is possible to obtain an electric device with less noise.

As the induced magnetic field control means, the electric power that energizes each coil group may be PWM controlled. In normal PWM control, the position of the magnetic field is detected and the amount of current flowing through each coil is controlled according to the specified rotation speed. The current waveform includes a rectangular wave drive and a sine wave drive, and either drive 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 so as to face each other with a gap between them. More specifically, it is provided with a stirring tub portion for holding the object to be agitated 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 a rotor. A support portion for fitting and supporting the lower end of the rotation shaft of the holding portion and a diameter-expanding portion for loosely fitting the rotor of the rotor holding portion inward are provided, and the rotation is provided on the outer wall of the diameter-expanding portion of the holding cup portion. A child drive unit is arranged.

The stirring tub portion of the present invention may be any one that holds the object to be agitated inside, and may be any one as long as the liquid inside does not leak to the outside. The holding cup portion of the present invention may be any one in which an opening is formed at a predetermined position inside the stirring tub portion. The stirring tub portion and the holding cup portion may be formed of the same container, or may be a combination of the respective members. When connecting the respective members, it is possible to sufficiently stop water by using a shield member such as an O-ring or a rubber packing. By forming the opening of the holding cup portion more preferably at the substantially central portion of the bottom portion inside the stirring tub portion, stirring by rotation of the stirrer can be efficiently performed.

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 a diameter-expanding portion that loosely fits the rotor of the rotor holding portion inward, and the diameter of the holding cup portion is expanded. A rotor drive unit is arranged on the outer wall of the unit. As a result, the rotor holding portion having the rotating shaft with the stirrer attached to the upper end portion is immersed in the inside of the stirring tub and the holding cup portion, that is, in the stirred liquid, so that the rotor holding portion is held in the stirred liquid. Therefore, there is little noise during driving.

Further, the rotor drive unit that drives the rotor holding portion is arranged on the outer wall of the enlarged diameter portion of the holding cup portion, and drives the rotor inside the enlarged diameter portion of the holding cup portion, so that the rotor and the rotor are driven. The drive unit can be made smaller and lighter. More preferably, the rotor is provided with a magnet portion in which N poles and S poles are alternately arranged around the axis of the rotating shaft, and the rotor driving portion faces the rotor to form a large number of coil groups concentrically. When provided with a cylindrically arranged coil portion and an induced magnetic field control means for inducing and controlling a rotating magnetic field by controlling the energization of each of a large number of coil groups, the size is sufficiently large to substantially cover the holding cup portion. The drive unit is formed. Therefore, the drive unit itself can be made small and lightweight.

Regarding the distance between the coil group of the rotor drive unit arranged on the outer wall of the enlarged diameter portion of the holding cup portion and the rotor of the rotor holding portion, the magnet portion of the rotor is used as a strong magnet to make a magnet. By increasing the number (number of poles) of, it is possible to make a gap of about 10 mm. However, by making the gap as small as possible, the torque loss is reduced. For this reason, the more the magnet part of the rotor is a strong magnet and the gap between the magnet part and the coil part of the rotor drive part is made smaller, the smaller the size of the drive system itself can be achieved, and the lighter and quieter the drive system itself is. 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 further preferably 2 mm or less. In the embodiment described later, in order to integrate the rotor, the magnet portion is covered with a 0.5 mm thick stainless steel plate, and the enlarged diameter portion of the 0.5 mm thick holding cup portion is separated by a gap of 1 mm or less. It is separated from the coil group of the rotor drive unit by the wall surface of the above, and the gap with the coil portion of the rotor drive unit is 2 mm or less.

Since the wall of the enlarged diameter portion of the holding cup portion is exposed to a rotating magnetic field, it tends to be heated. Therefore, the holding cup portion is preferably made of a heat resistant material. In addition, in view of the relationship between the magnet portion and the rotor drive portion, it is preferable that the thickness in the vicinity of the rotor drive portion of the cup container is thin. From this point of view, it is preferable that the holding cup portion is made of a heat-resistant resin or a metal that easily allows a magnetic field to pass through. Specifically, super engineering plastics such as polyether sulfone (PES) and polyphenylene sulfide (PPS), engineering plastics such as polyamide (PA) and polycarbonate (PC), and heat resistant resins such as glass fiber reinforced plastics. Examples include alloys such as stainless steel and aluminum.

A stirring tub for holding the object to be agitated inside and a holding cup portion having an opening formed at a predetermined position at the bottom of the stirring tub are provided, and the holding cup portion rotates the rotor holding portion. A support portion for fitting and supporting the lower end portion of the shaft and a diameter-expanding portion for loosely fitting the rotor of the rotor holding portion are provided, and the rotor driving portion is arranged on the outer wall of the diameter-expanded portion of the holding cup portion. Will be done. As a result, there is no possibility that the agitated material leaks from the container holding the agitated material, and there is no concern about malfunction or noise due to the drive of the gear.

The stirrer of the present invention may be any one that mixes the material to be agitated held in the stirring tub by rotation. It refers to a product in which a plurality of plate-shaped or rod-shaped members are evenly arranged around a rotating shaft. The plate-shaped member includes a member arranged horizontally, vertically, diagonally, or curved with respect to the rotation direction, and includes a member having a bent tip portion. The rod-shaped member includes a member arranged orthogonally and inclined with respect to the rotation axis, and includes a member having a bent tip portion.

The agitated material in the stirrer of the present invention is generally agitated from powders and granules that are unlikely to leak to liquids that usually require various measures to prevent leakage. Can handle things. In particular, even in stirring between water and a glue material that solidifies when dried as an object to be agitated and causes various harmful effects, it is necessary to use an O-ring or rubber packing that violently shrinks due to the drying of the glue and impairs the shielding ability. Therefore, there is no possibility that the liquid inside will leak out of the stirring tub.

The glue material in this case includes not only starch glue but also synthetic resin-based adhesives such as vinyl acetate resin-based adhesives or acrylic resin-based adhesives that can be dissolved and adjusted with water like starch glue. It also includes not only a single substance but also a mixture of two or more species.

The induced magnetic field control means of the present invention preferably controls to reduce the rotation speed of the rotor or intermittently drive the rotor at the initial stage of stirring. This is because, depending on the shape of the stirrer and the amount of the glue material dissolved in water, if the mixture is stirred at a large rotation speed at the initial stage of stirring, it is vigorously stirred and the glue material and water may pop out from the stirring tub. That is, since the glue material is hardly dissolved in water at the initial stage of stirring, the viscosity is low and the rotor is not rotated at high speed. Therefore, the rotation speed of the rotor is reduced or the rotor is intermittently driven to drive the glue material. Prevents water and water from jumping out of the stirring tub.

In the motor of the present invention, as described above, the rotor holding portion itself is held in the liquid to be agitated, so that there is less noise during driving, and the rotating shaft itself does not penetrate the stirring tub portion, so that the stirring tub portion itself. The liquid to be agitated is less likely to leak from. Further, since the drive portion is formed in a size that substantially covers the holding cup portion, the drive portion itself can be made smaller and lighter. Further, since the electric system itself can be arranged outside the liquid to be agitated, there is no concern about electric leakage, and it can be used without any problem even in high humidity and water. Therefore, it is suitable as a drive system for a stirrer.

FIG. 1 is a front view illustrating the configuration of an embodiment of the stirrer of the present invention. FIG. 2 is a plan view of FIG. FIG. 3 is a bottom view of FIG. FIG. 4 is a side sectional view of FIG. 5 is an explanatory view showing the configuration of a main part of FIG. 1, FIG. 5 is a front view, and FIG. b is a cross-sectional view of FIG. 6 is an explanatory view showing the configuration of the rotor holding portion of FIG. 5, FIG. 6 is a front view, and FIG. b is a cross-sectional view of FIG. FIG. 7 is an explanatory diagram illustrating the configuration of the magnet portion of the rotor holding portion of FIG. 8 is an explanatory view showing the configuration of the stirrer of FIG. 5, where a is a plan view, b is a perspective view, c is a front view, and d is a right side view.

As shown in FIGS. 1 to 8, the stirrer 10 of this embodiment is roughly divided into a plastic stirring tub portion 11 that holds water and glue material inside, and agitates the bottom surface of the stirring tub portion 11. It consists of a base 21 that supports this. The base 21 is movably supported by four casters 22 on the front, back, left and right, and an operation panel 23 equipped with a drive timer or the like is arranged in front of the base 21.

The opening 34 of the holding cup portion 31 is attached so as to communicate with each other so as to close the 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 portion 44 is attached to the rotor holding portion 41 so as to close the opening portion 34. Below the countersunk portion 44, a rotor 42 that rotates according to the displacement of the rotating magnetic field, a rotating shaft 43 in which the rotor 42 is arranged around the axis, and an upper end portion of the rotating shaft 43 are arranged. It is provided with a stirrer 49.

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 the rotating shaft 43, and the outer periphery of these magnet portions 45 integrates individual magnet portions 45. It is covered with a stainless steel plate 46 having a thickness of 0.5 mm. Further, the rotating shaft 43 has a communication hole 47 formed in the shaft center portion from the upper end to the lower end. The communication hole 47 allows the liquid to be agitated to escape from the lower end to the upper end, facilitating attachment / detachment.

The holding cup portion 31 has a support portion 32 that rotatably fits and supports the lower end portion of the rotary shaft 43 of the rotor holding portion 41, and an enlarged diameter portion 33 that loosely fits the rotor 42 of the rotor holding portion 41 inside. And a dish portion 44 that forms an opening 34 to the stirring tub portion 11. A fluorine-based sleeve bearing 44a as a first bearing to be fitted to the rotating shaft 43 is mounted on the central portion of the dish portion 44. Further, a fluorine-based sleeve bearing 48 as a second bearing is fitted to the rotating shaft 43 at the boundary between the enlarged diameter portion 33 and the support portion 32. The length of the lower end of the rotating shaft 43 is longer than the length of the rotor. This is because when the rotor holding portion 41 is mounted from the opening 34, the rotor provided with the magnet portion is inserted into the enlarged diameter portion after the lower end portion 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 drive portion 51 is arranged on the outer wall of the diameter-expanded portion 33 of the holding cup portion 31 inside the base 21. At the upper end of the rotor drive unit 51, a pressing piece 52 that sandwiches the periphery of the opening of the stirring tub portion 11 via the dish portion 44 of the holding cup portion 31 and the packing 35 is arranged, and below the pressing piece 52, A coil portion 53 in which a large number of coil groups are arranged concentrically in a tubular shape facing the rotor is arranged. The induction magnetic field control means for inducing and controlling the rotating magnetic field by controlling the energization of each of the numerous coil groups of the coil unit 53 is arranged on the control panel 24 of the base 21.

The induced magnetic field control means of the control panel 24 sequentially displaces the polarity of the generated magnetic field by PWM-controlling the electric power energized in each coil group of the coil unit 53 of the rotor drive unit 51 to sequentially switch the polarity. .. The sequentially displaced rotating magnetic field rotates the rotor 42 by the magnetic attractive force and the repulsive force acting on the individual magnet portions 45 of the rotor 42. The rotating shaft 43 and the stirrer 49 are rotated by the rotation of the rotor 42 to stir the glue material inside the stirring tub 11 and water.

In the stirrer 10 of this embodiment, the induction magnetic field control means of the control panel 24 is controlled so as to change the stirring speed between the initial stage of stirring and the latter stage of stirring. That is, 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, control is performed to set the rotation speed to 800 rpm over one and a half minutes. This is because the glue material is not completely dissolved in water at the beginning of stirring, so by gently stirring, water is prevented from jumping out of the stirring tub 11 due to the rotation of the stirrer, and the glue is dissolved in water in the latter stage of stirring. As a result, the viscosity can be increased, so that the number of rotations can be increased.

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

The stirrer 49 of this embodiment bends at a first bending angle of 142 ° with respect to the horizontal disk 49a orthogonal to the rotating shaft 43 with an angle of 15 ° with respect to the circumference of the disk. Two stirring blade pieces 49b having a plate thickness of 2 mm having a 30 mm long intermediate blade portion and an 80 mm long tip blade portion bent at a second bending angle of 151 ° are formed upright. In this stirrer 49, even if the rotation speed of the stirring blade at the beginning of stirring is set to 300 rpm, the agitated liquid of the glue material and water has a diameter of about 42 cm and a height of about 43 cm. It has been confirmed that when ~ 18 kg and 10 kg to 18 kg of water are added, the liquid to be agitated does not jump out of the stirring tub 11, and no air is caught even at 800 rpm after one and a half minutes.

A pump 25 is provided inside the base 21, and a hose (not shown) is used to extract the agitated liquid from the discharge port 12 bored in the bottom surface of the stirring tub 11 by a hose (not shown). It can be supplied to the outside of the device 10. A perforated plate 13 is arranged at the discharge port 12, and large particles and the like are filtered by the perforated plate 13.

As described above, since the rotor holding portion 41 itself is held in the liquid to be agitated, there is less noise during driving, and since the rotating shaft 43 itself does not penetrate the stirring tub portion 11, the agitated tub portion 11 is to be agitated. Less liquid leaks. Further, since the drive portion is formed in a size that substantially covers the holding cup portion 31, the drive portion itself can be made smaller and lighter. Further, since the electric system itself can be arranged only inside the base 21, there is no concern about electric leakage, and it can be used without any problem even in high humidity and water. Therefore, it is suitable as a drive system for the stirrer 10.

10 ... Stirrer,
11 ... Stirring tub,
12 ... Outlet,
13 ... Eye plate,
21 ... Base,
22 ... Caster,
23 ... Operation panel,
24 ... Control panel,
25 ... Pump,
31 ... Holding cup part,
32 ... Support part,
33 ... Diameter expansion part,
34 ... opening,
35 ... Packing,
41 ... Rotor holder,
42 ... Rotor,
43 ... Rotation axis,
44 ... dish part,
44a ... Sleeve bearing (first bearing),
45 ... Magnet part,
46 ... Stainless steel plate,
47 ... Communication hole,
48 ... Sleeve bearing (second bearing),
49 ... Stirrer,
49a ... Horizontal disk,
49b ... Stirring blade piece,
51 ... Rotor drive unit,
52 ... Pressing piece,
53 ... Coil part,

Claims (4)

A rotor holding portion including a rotor that rotates according to the displacement of the rotating magnetic field, a rotating shaft in which the rotor is arranged around the axis, and a stirrer arranged at the upper end of the rotating shaft.
It is a stirrer equipped with an electric motor that is arranged so as to face each other with a gap between the rotor drive unit that generates a rotating magnetic field having a rotation center on the rotation axis of the rotor facing each other.
A stirring tub that holds the object to be agitated inside,
A holding cup portion having an opening formed at a predetermined position at the bottom portion inside the stirring tub is provided.
The holding cup portion includes a support portion that fits and supports the lower end portion of the rotation shaft of the rotor holding portion, and a diameter-expanded portion that loosely fits the rotor of the rotor holding portion inward.
The rotor drive unit is arranged on the outer wall of the enlarged diameter portion of the holding cup portion.
The rotor holding portion includes a dish portion that closes the opening of the holding cup portion.
The rotor holding portion has a first bearing fitted to the rotating shaft of the rotor holding portion mounted on the central portion of the dish portion, and the enlarged diameter portion and the supporting portion of the holding cup portion. It is detachably inserted into the holding cup portion by a second bearing fitted to the rotating shaft of the rotor holding portion at the boundary of the rotor.
A stirrer characterized in that the rotating shaft of the rotor holding portion is provided with a communication hole formed in the shaft center portion from the upper end to the lower end. The stirrer according to claim 1, wherein 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 unit controls the energization of a coil unit in which a large number of coil groups are concentrically arranged in a tubular shape facing the rotor and the energization of each of the large number of coil groups to induce and control the rotating magnetic field. Equipped with an induced magnetic field control means
The stirrer according to claim 1 or 2, wherein each coil of the coil group is arranged in a direction for generating an induced magnetic field facing the rotor. The stirrer according to claim 3, wherein the induced magnetic field control means controls to reduce the rotation speed of the rotor or intermittently drive the rotor at the initial stage of stirring.

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