JP2009050821A - Paint feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize protection against seizure occurence and reduction in energy necessary for agitation. <P>SOLUTION: An agitation mechanism M formed in a paint feed passage 82 between a tank (paint feed source) 80 and a coating gun 81 is provided with a cylindrical member 10 through which a paint passes, an agitation member 50 which agitates the paint by rotation in the cylindrical member 10, and a drive means 70 which allows the agitation member 50 to rotate and drive while keeping it in a state not in contact with the internal circumference of the cylindrical member 10 by magnetic force. Since the agitation member 50 rotates in the state not in contact with the cylindrical member 10, the agitation member 50 can rotate at a high speed without seizure. Since the object to be agitated is not a bulk of the water-based paint stored in the tank 80 but is a bit of the water-based paint which passes through the agitation mechanism M, the energy necessary for rotating the agitation member 50 can be small. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a paint supply apparatus.

In recent years, water-based paints are frequently used in consideration of the natural environment. The water-based paint has a low water evaporation rate from the time it is sprayed from the paint gun in the atomized state until it is applied to the object, so when using a low-viscosity water-based paint with a high water content In this case, there is a concern that the paint applied to the surface to be coated flows down by its own weight. Therefore, it is desirable that the water-based paint has a low water content. However, since the viscosity increases when the water content is reduced, this time, there is a problem that the paint is difficult to atomize when ejected from the coating gun.
Therefore, as described in Patent Document 1, as a means for reducing the viscosity while keeping the moisture ratio low, the aqueous paint has a thixotropy by stirring the aqueous paint in a tank in which the aqueous paint is stored. It is conceivable to reduce the viscosity by using the property.
JP 2003-181263 A

In order to obtain the effect of reducing the viscosity by using thixotropy, it is necessary to rotate the stirrer at a high speed of at least about 3,000 rpm. When driven at such a high speed, the stirrer is supported. There is a risk of seizing due to contact friction between the rotating shaft and the bearing.
Moreover, since a large amount of water-based paint is stored in the paint supply source, in order to agitate this large amount of water-based paint, the energy required to drive the stirrer increases, leading to an increase in cost. is there.
The present invention has been completed based on the above situation, and aims to prevent the occurrence of seizure and reduce the energy required for stirring.

  As a means for achieving the above object, the invention of claim 1 includes a supply path for supplying paint from a paint supply source to the coating gun, and a stirring mechanism provided in the middle of the supply path. The mechanism is provided with a cylindrical member having a stirring space for circulating the paint, and is rotatably provided in the cylindrical member, and the stirring piece is rotated in a direction intersecting with the flow direction of the coating material to thereby move the stirring space. A stirrer that stirs the paint, and a drive unit that drives the stirrer to rotate in a non-contact state with the inner peripheral surface of the cylindrical member by magnetic force. Have.

  According to a second aspect of the present invention, in the first aspect of the present invention, the driving means can be integrally rotated with the driving member and a driving member that rotates coaxially with the agitating member outside the cylindrical member. A drive-side magnet provided on the stirring member and a driven-side magnet provided to be rotatable integrally with the stirring member, and the stirring member is moved by the magnetic attraction between the drive-side magnet and the driven-side magnet. It is characterized in that it rotates integrally with the drive member.

According to a third aspect of the present invention, in the first or second aspect of the present invention, in the vicinity of the upstream side of the stirring piece in the stirring space, a flow hole allowing the flow of the paint, and the flow of the paint It has a feature in that a blocking portion for blocking is provided so as to be adjacent to each other in the circumferential direction.
The invention of claim 4 is characterized in that, in the invention according to any one of claims 1 to 3, the region of the stirring space in which the stirring piece rotates is partitioned as a stirring chamber. .

<Invention of Claim 1>
Since the stirring member rotates without contact with the inner peripheral surface of the cylindrical member, there is no possibility that seizure will occur even if the stirring member is rotated at a high speed. In addition, the target of stirring is not the entire amount of water-based paint stored in the paint supply source, but only a small amount of water-based paint that passes through the stirring mechanism, so that the energy required to rotate the stirring member is reduced. Less is enough.

<Invention of Claim 2>
When the drive member is rotationally driven to rotate the stirring member, the stirring piece rotates in the stirring space to stir the paint so as to shear the paint, and the paint is stirred by this stirring action. Even if the passage time of the paint in the stirring mechanism is short, the paint can be sufficiently stirred by increasing the rotation speed of the drive member, that is, the rotation speed of the stirring piece.
Further, as means for transmitting the rotational force to the stirring member accommodated in the cylindrical member, a transmission member provided so as to rotate integrally with the stirring member is penetrated to the outside of the cylindrical member, and the rotational force is transmitted to the transmission member. However, in the case where the rotating transmission member penetrates the cylindrical member in this way, the paint that has entered the gap in the penetration portion of the transmission member becomes highly viscous and adheres, and therefore stirring is performed. There is a concern that the rotation of the member may be hindered. On the other hand, in the present invention, since magnetic force is used as means for applying a rotational force to the stirring member, it is possible to avoid the rotation failure of the stirring member due to the high viscosity of the paint as described above.

<Invention of Claim 3>
The paint is generally laminar while flowing in the flow hole, and immediately after passing through the flow hole, the paint is stirred while being sheared by the stirring piece so as to cross the flow almost at right angles, so the shear effect by the stirring piece is high. The paint can be well stirred.
<Invention of Claim 4>
In the agitation chamber, the paint that has received the agitation force from the agitation piece is difficult to escape to the outside.

<Embodiment 1>
A first embodiment of the present invention will be described below with reference to FIGS. The paint supply apparatus of the present embodiment includes a supply path 82 for supplying an aqueous paint (hereinafter referred to as paint) stored in a tank 80 (a paint supply source that is a constituent of the present invention) to the paint gun 81. , And a stirring mechanism M provided in the middle of the supply path 82. The stirring mechanism M is for reducing the viscosity of the paint by stirring the paint using the thixotropic property of the paint. In this embodiment, the length of the flow path 82B from the stirring mechanism M to the coating gun 81 in the supply path 82 is set to a dimension of 10 m or less.

  The stirring mechanism M is configured to include a cylindrical member 10, a stirring member 50, and driving means 70. The cylindrical member 10 has an agitation space 15 for allowing the paint to flow therethrough. The agitating member 50 is rotatably provided in the cylindrical member 10 and agitates the paint in the agitating space 15 by rotating the agitating piece 61 in a direction crossing the paint flow direction. The driving means 70 rotates the agitating member 50 while maintaining a non-contact state with the inner peripheral surface of the cylindrical member 10 by magnetic force, and is coaxial with the agitating member 50 outside the cylindrical member 10. Drive gear 30 (drive member which is a constituent element of the present invention), a drive side magnet 35 provided so as to be integrally rotatable with the drive gear 30, and a driven side provided so as to be integrally rotatable with the stirring member 50. A magnet 53 is provided.

<Tubular member 10>
The cylindrical member 10 includes a cylindrical cylindrical body 11 made of a nonmagnetic material, a cylindrical upper support 12, and a cylindrical lower support 13. The cylindrical body 11 has its axis line oriented vertically, and the upper support 12 is concentrically fitted into the opening on the upper surface of the cylindrical body 11, and the lower support 13 is concentric with the opening on the lower surface of the cylindrical body 11. Is fitted. The tubular member 10 is fixed and supported while being sandwiched between the upper base plate 40 and the lower base plate 41 in the vertical direction. Of the internal space of the tubular member 10, the upper half region is a housing space 14, and the lower half region is a stirring space 15.

  In the stirring space 15, three partition plates 16 and two spacers 20 are alternately stacked in the vertical direction. The partition plate 16 has a disk shape perpendicular to the axis of the cylindrical body 11 and is fitted and fixed to the inner periphery of the cylindrical body 11 without radial and circumferential backlash. The spacer 20 has a cylindrical shape and is fitted and fixed to the inner periphery of the cylindrical body 11 without radial play. In the partition plate 16, four circulation holes 17 having a circular shape with an equiangular interval in the circumferential direction and a central hole 18 that is concentric with the partition plate 16 and communicates with the four circulation holes 17 penetrate vertically. Is formed. Further, four remaining regions other than the flow hole 17 and the center hole 18 in the partition plate 16 serve as a blocking portion 19 having a wedge shape (substantially triangular shape). The three partition plates 16 are positioned by the spacer 20 so as to be spaced apart from each other. Further, the three partition plates 16 are arranged so that the circulation holes 17 are in the same position in the circumferential direction, in other words, the circulation holes 17 correspond to each other vertically. In the flow hole 17, the paint that has flowed into the cylindrical body 11 flows downward. Moreover, in the interruption | blocking part 19, the distribution | circulation of a coating material is interrupted | blocked. In the stirring space 15, two stirring chambers 21 partitioned by the three partition plates 16 in the rotation axis direction of the cylindrical member 10 are provided at the same height as the spacer 20.

  Further, a bearing plate 22 having a flat plate shape perpendicular to the axis of the cylinder 11 is sandwiched between the lower end surface of the cylinder 11 and the lower support 13. A plurality of notch holes 23 are formed in the bearing plate 22 so as to be eccentric from the center and spaced in the circumferential direction, and a bearing portion 24 is formed at the center of the bearing plate 22. Has been.

  A cylindrical inflow side joint 25 with its axis oriented in the vertical direction is fixed to the upper support 12, and a cylindrical outflow side joint 26 with its axis directed in the vertical direction is fixed to the lower support 13. Yes. A downstream end of the flow path 82A on the tank 80 side in the supply path 82 is connected to the inlet 24a that opens upward on the inflow side joint 26, and a supply path to the outlet 25a that opens downward on the outflow side joint 26. The upstream end of the flow path 82B on the coating gun 81 side in 82 is connected. The inflow port 24 a communicates with the upper end of the stirring space 15 through the central hole 18 of the upper support 12, and the outflow port 25 a communicates with the lower end of the stirring space 15 through the central hole 18 of the lower support 13. The paint supplied from the inlet 24a into the cylindrical member 10 flows downward (substantially parallel to the axis of the cylindrical member 10) in the cylindrical member 10 and flows out of the cylindrical member 10 from the outlet 25a. It is like that.

<Drive gear 30>
On the outer periphery of the upper support 12, a drive gear 30 made of a non-magnetic material concentric with the cylindrical member 10 is regulated by the bearing 31 in the vertical direction (the axial direction of the drive gear 30). And supported while being allowed to rotate coaxially with the cylindrical member 10. The drive gear 30 is formed by assembling a cylindrical gear body 32 and a cylindrical magnet holder 33 so as to be integrally rotatable by bolts 34. The magnet holder 33 has an even number of drive side magnets 35. However, it is attached so that the N pole and the S pole are alternately arranged on the inner peripheral surface of the magnet holder 33 with an interval in the circumferential space. These driving side magnets 35 are close to and opposed to the outer peripheral surface of the cylindrical body 11 of the cylindrical member 10, and as the driving gear 30 rotates, the plurality of driving side magnets 35 are cylinders. It is configured to rotate along the outer peripheral surface of the body 11.

  A motor 42 is fixed to the upper base plate 40. An output gear 44 is fixed to the downward output shaft 43 of the motor 42 so as to rotate integrally. The output gear 44 is meshed with the drive gear 30. When the motor 42 rotates, the rotational force of the motor 42 is transmitted to the drive gear 30 via the output gear 44 so that the drive gear 30 is driven to rotate. It has become.

<Agitating member 50>
A stirring member 50 is accommodated in the internal space (stirring space 15) of the cylindrical member 10. The stirring member 50 is made of a nonmagnetic material, and the upper half region is a circular magnet holding portion 51, and the substantially lower half region is a stirring function portion 59 that is generally circular. The outer diameter of the magnet holding part 51 is set to be slightly smaller than the inner diameter of the cylindrical body 11, and the magnet holding part 51 is formed with the same number of holding spaces 52 in which the outer periphery is recessed as the driving side magnet 35. Has been. In the plurality of holding spaces 52, a plurality of driven magnets 53 corresponding to the driving magnets 35 are accommodated so that N poles and S poles are alternately arranged on the outer peripheral surface side. The driven magnet 53 is covered and hidden so as not to come into contact with the paint by a cover 54 attached to the opening of the holding space 52.

  In the magnet holding part 51, an introduction hole 55 that is concentric with the magnet holding part 51 and opens at the upper end surface of the magnet holding part 51 is formed. The lower end portion of the magnet holding portion 51 is a small-diameter portion 56 whose outer diameter is concentrically reduced. The small-diameter portion 56 is formed with four communication holes 57 that are formed in a radial direction from the outer peripheral surface toward the center thereof. Each communication hole 57 is formed at the lower end of the introduction hole 55 at the center of the small-diameter portion 56. Communicated with. Further, on the upper end surface of the magnet holding portion 51, four flat plate-like blade plates 58 are formed so as to protrude upward so as to surround the introduction hole 55. Since the plate surface of each blade plate 58 is substantially along the radial direction, the blade plate 58 rotates and moves substantially at right angles to the plate surface when the stirring member 50 rotates.

  The stirring function part 59 includes a columnar support leg 60 that is concentric with the magnet holding part 51 and has an outer diameter smaller than that of the small diameter part 56, and a plurality of stirring pieces 61 formed on the outer periphery of the support leg 60. Become. Since the upper end of the support leg 60 is connected to the lower end surface of the small-diameter portion 56 of the magnet holding part 51, the stirring function part 59 and the magnet holding part 51 rotate integrally. A ball 62 is fixed to the lower end of the support leg 60 in a form in which a substantially upper half region is embedded. The stirring pieces 61 are divided into two portions spaced apart in the axial direction (vertical direction) of the stirring member 50 and a total of eight stirring pieces 61 are arranged, and the upper four stirring pieces 61 are spaced equiangularly in the circumferential direction. The lower four pieces of stirring pieces 61 are also arranged at equiangular intervals in the circumferential direction. Each stirring piece 61 has a flat plate shape, and the plate surface is inclined obliquely so as to form a spiral on the outer periphery of the support leg 60. In other words, the plate surface of the stirring piece 61 is slightly inclined with respect to the axial direction of the support leg 60.

  The stirring member 50 has a substantially concentric posture with the cylindrical member 10 and the drive gear 30 in the cylindrical body 11 (cylindrical member 10) by a thrust bearing mechanism in which the ball 62 is brought into contact with the upper surface of the bearing portion 24. It is supported so that it can rotate freely coaxially with the cylinder 11 while keeping. Since the contact form between the ball 62 and the bearing portion 24 is point contact (the contact area is very small), even if the stirring member 50 rotates at a high speed, the frictional resistance generated between the ball 62 and the bearing portion 24 is kept small, No seizure occurs. The magnet holding portion 51 (including the small diameter portion 56) of the stirring member 50 is accommodated in the magnet accommodating space 14 in the cylindrical body 11, and the driven side magnet 53 with the N pole facing the outer peripheral side has the S pole. The driven magnet 35 corresponding to the drive side magnet 35 facing the inner peripheral side at the same height and having the south pole facing the outer peripheral side is the drive side magnet 35 having the north pole directed to the inner peripheral side. Corresponds to the same height. The stirring member 50 is rotated integrally with the drive gear 30 by a radial magnetic attractive force generated between the corresponding drive side magnet 35 and the driven side magnet 53. Further, since the magnetic attractive force generated between the drive side magnet 35 and the driven side magnet 53 acts at equal angular intervals in the circumferential direction, the stirring member 50 maintains a concentric posture with the cylindrical body 11 without being inclined, The outer periphery of the stirring member 50 and the inner peripheral surface of the cylindrical member 10 are kept in a non-contact state. This non-contact state is maintained both when the stirring member 50 is rotating and when the rotation is stopped.

On the other hand, the stirring function part 59 is accommodated in the stirring space 15, and the support leg part 60 is positioned so as to penetrate the three central holes 18. The upper stirring piece 61 rotates horizontally in the stirring chamber 21 having a height corresponding to that of the upper spacer 20 (the height between the uppermost partition plate 16 and the central height partition plate 16). The lower stirring piece 61 is accommodated so as to obtain a height corresponding to the lower spacer 20 (the height between the partition plate 16 having the central height and the lowermost partition plate 16). It is accommodated so that it can rotate horizontally. In this state, the flow hole 17 that allows the downward flow of the paint and the blocking portion 19 that blocks the flow of the paint are located near the upper side of the stirring piece 61 (the upstream side in the flow direction of the paint). It will be located so that it may adjoin in the circumferential direction. <Operation and Effect of Embodiment>
Next, the operation of this embodiment will be described.
The paint supplied from the tank 80 toward the coating gun 81 by a pump (not shown) is stirred while passing through the stirring mechanism M, so that the viscosity is lowered. When stirring, first, the drive gear 30 is rotated by the motor 42, and the stirring member 50 is rotated in the cylindrical member 10. In this state, the accommodation space 14 of the cylindrical member 10 is opened from the inlet 24a. Supply paint to the top. The supplied paint flows into the introduction hole 55 of the stirring member 50, flows out of the stirring member 50 through the communication hole 57, and in the stirring space 15, the flow hole 17 of the uppermost partition plate 16, The bearing chamber passes through the stirring chamber 21 surrounded by the spacer 20, the two-way space of the partition plate 16 at the center height, the stirring chamber 21 surrounded by the lower spacer 20, and the flow hole 17 of the lowermost partition plate 16. After passing through the cutout hole 23 of the plate 22, it flows out from the outlet 25 a to the outside of the tubular member 10 (stirring space 15) (toward the coating gun 81).

While the paint passes through the agitating chamber 21, a plurality of stirring pieces 61 rotating in a horizontal direction substantially perpendicular to the direction in which the paint flows (direction parallel to the axis of the cylindrical member 10) Across at a right angle. Thereby, the coating material is stirred so as to be sheared by the stirring piece 61, and the viscosity is lowered due to thixotropy.
Hereinafter, the result of the experiment using the stirring mechanism M of this embodiment will be described. In the state where the mixing ratio of the main agent and water in the tank 80 is 4.3 and the water-based paint having a temperature of 24 ° C. is stored and stirred, the viscosity of the paint is 28.8 seconds (FC # 4). When the paint in the tank 80 was supplied to the stirring mechanism M and the viscosity of the stirred paint was measured, the viscosity of the paint decreased to 21.5 seconds (FC # 4). At this time, the rotation speed of the stirring member 50 was 3,000 rpm, and the flow rate of the paint was 200 ml / sec. Further, the viscosity of this stirred paint 21.5 seconds (FC # 4) was maintained for about 5 minutes after being discharged from the stirring mechanism M.

Further, in the vicinity of the upstream side of the stirring piece 61 in the stirring space 15, a flow hole 17 that allows the flow of the paint and a blocking portion 19 that blocks the flow of the paint are provided adjacent to each other in the circumferential direction. ing. As a result, the paint is substantially laminar while flowing in the flow hole 17, and immediately after passing through the flow hole 17, it is stirred while being sheared by the stirring piece 61 so as to cross the flow substantially at right angles. The shear effect by the piece 61 is high, and the paint is well stirred.
Moreover, since the region in which the stirring piece 61 rotates is defined as the stirring chamber 21, in the stirring chamber 21, the paint that has received the stirring force from the stirring piece 61 is difficult to escape to the outside of the stirring chamber 21. Yes. Thereby, a coating material can be stirred efficiently.

Further, in order to reduce the viscosity of the paint using thixotropy, it is necessary to stir the paint at a high speed of at least 1,000 rpm. If the rotation mechanism in this stirrer brings the peripheral surfaces into contact with each other In the case of a mechanical bearing structure, there is a possibility that seizure occurs in the bearing at a low speed of about 500 rpm.
On the other hand, in the present embodiment, since the stirring member 50 rotates without contact with the inner peripheral surface of the cylindrical member 10, even if the stirring member 50 is continuously rotated at a high speed of 10,000 rpm for a long time, the seizure member 50 is seized. There is no risk of this happening. In addition, the object to be agitated is not the whole of the large amount of paint stored in the tank 80, but only a small amount of paint that passes through the agitation mechanism M. Therefore, the energy required to rotate the agitation member 50 is increased. Less is enough.

  When the drive gear 30 is driven to rotate and the stirring member 50 is rotated, the stirring piece 61 rotates in the stirring space 15 to stir the paint so as to shear the paint, and the paint is stirred by this stirring action. Even if the passage time of the paint in the stirring mechanism M is short, the paint can be sufficiently stirred by increasing the rotational speed of the drive gear 30, that is, the peripheral speed of the rotating stirring piece 61.

  Further, as a means for transmitting the rotational force to the stirring member 50 accommodated in the cylindrical member 10, a transmission member provided so as to rotate integrally with the stirring member is penetrated to the outside of the cylindrical member, and the transmission member A structure that imparts rotational force is also conceivable, but in the case where the rotating transmission member penetrates the cylindrical member in this way, the paint that has entered the gap in the penetration portion of the transmission member becomes highly viscous and adheres, and therefore There is a concern that the rotation of the stirring member may be hindered. On the other hand, in this embodiment, since the magnetic force is used as means for applying the rotational force to the stirring member 50, the rotation failure of the stirring member 50 due to the high viscosity of the paint as described above is avoided. Can do.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, a flow hole that allows the flow of the paint and a blocking portion that blocks the flow of the paint are provided in the vicinity of the upstream side of the stirring piece so as to be adjacent to each other in the circumferential direction. Immediately after the paint flowing in a laminar flow passes through the circulation hole, the stirring piece crosses the substantially laminar flow paint. However, according to the present invention, such a circulation hole and a blocking portion are not provided. It is good also as a structure.
(2) In the above embodiment, a plurality of stirring pieces are provided at intervals in the flow direction of the paint. However, according to the present invention, the stirring pieces may be provided only at one place in the flow direction of the paint.
(3) In the above embodiment, a plurality of stirring pieces and a plurality of blocking portions (flow holes) are alternately arranged in the flow direction of the paint, but according to the present invention, at least of the stirring pieces and the blocking portions (flow holes). Either one may be one.
(4) In the above embodiment, the stirring piece is provided on the outer peripheral surface of the stirring member. However, according to the present invention, the stirring member may be cylindrical and the stirring piece may be provided on the inner periphery thereof.
(5) In the above embodiment, the number of flow holes and blocking portions is four, but according to the present invention, these numbers may be three or less, or five or more.
(6) In the above embodiment, the case where the aqueous paint stored in the tank is supplied to the coating gun has been described. However, the present invention uses a two-component paint obtained by mixing the main agent and the curing agent as a coating gun. It can also be applied to supply.
(7) Although the case where the paint is a water-based paint has been described in the above embodiment, the present invention can also be applied when the paint is a solvent-based paint.

Sectional drawing of Embodiment 1 Sectional drawing of the cylinder which comprises a cylindrical member Top view of cylinder Sectional drawing of the magnet holder which comprises a rotating member Front view of stirring member Cross section of stirring member Top view of stirring member Bottom view of stirring member Overall schematic

Explanation of symbols

M ... Stirring mechanism 10 ... Cylindrical member 15 ... Stirring space 17 ... Flow hole 19 ... Blocking portion 21 ... Stirring chamber 30 ... Drive gear (drive member)
35 ... Driving side magnet 50 ... Stirring member 53 ... Driven side magnet 61 ... Stirring piece 70 ... Driving means 80 ... Tank (paint supply source)
81 ... Paint gun 82 ... Supply path

Claims (4)

A supply path for supplying paint from the paint supply source to the paint gun;
A stirring mechanism provided in the middle of the supply path,
The stirring mechanism is
A cylindrical member having a stirring space for circulating the paint;
A stirring member that is rotatably provided in the cylindrical member, and stirs the paint in the stirring space by rotating the stirring piece in a direction intersecting the flow direction of the paint.
A paint supply apparatus, comprising: a driving unit configured to rotate the stirring member while maintaining a non-contact state with an inner peripheral surface of the cylindrical member by a magnetic force. The driving means includes
Outside the cylindrical member, a driving member that is rotationally driven coaxially with the stirring member;
A drive-side magnet provided on the drive member so as to be integrally rotatable;
A driven magnet provided on the stirring member so as to be integrally rotatable,
2. The paint supply apparatus according to claim 1, wherein the stirring member is rotated integrally with the driving member by a magnetic attractive force between the driving side magnet and the driven side magnet. .   In the vicinity of the upstream side of the stirring piece in the stirring space, a flow hole that allows the flow of the paint and a blocking portion that blocks the flow of the paint are provided adjacent to each other in the circumferential direction. The paint supply apparatus according to claim 1 or 2, wherein the paint supply apparatus is characterized in that:   The paint supply device according to any one of claims 1 to 3, wherein a region in which the stirring piece rotates in the stirring space is partitioned as a stirring chamber.

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