JP2020006288A - mixer - Google Patents

Abstract

An object of the present invention is to reduce the possibility of intrusion of foreign matter or the like with a simple configuration. A stirrer (1) includes a main body housing (2), a brushless motor (5) housed in the main body housing (2) with a rotating shaft (42) directed forward, and a rotary drive by the brushless motor (5), which protrudes from the main body housing (2) to mix. The spindle 9 includes a detachable blade 9, a centrifugal fan 49 that rotates by the rotation of the rotating shaft 42, and a battery pack 23 disposed at a lower portion of the main body housing 2. An intake port 57 for sucking outside air by the rotation of the centrifugal fan 49 is provided. [Selection diagram] FIG.

Description

  The present invention relates to a stirrer in which a material to be stirred can be stirred by a mixing blade by rotating a final output shaft equipped with the mixing blade.

As disclosed in Patent Document 1, for example, the stirrer rotates by driving a motor housed in a housing, and detachably attaches a stirring blade (mixing blade) to a final output shaft protruding forward from the housing. The rotation of the stirring blade accompanying the driving of the motor enables the stirring of the material to be stirred such as lysine and mortar.
A motor cooling fan is provided on the output shaft of the motor, and the rotation of the fan accompanying the rotation of the output shaft draws in outside air from an intake port provided in the housing, cools the motor, and then provides the housing with the fan. Can be discharged to the outside through the exhaust port.

JP 2011-232091 A

  In the conventional stirrer described above, if the suction port is formed on the side surface of the housing, when the stirrer is placed horizontally on the ground or the like, foreign matter or the like may be sucked from the suction port on the side surface and cause a failure. . Therefore, it is necessary to provide a cover using a sponge, a wire mesh, or the like at the intake port, which leads to an increase in cost. In addition, if the sponge or the like is clogged with dust, the air volume decreases and the cooling effect of the motor deteriorates. Therefore, it is necessary to periodically clean or replace the cover, and the maintenance is troublesome.

  Therefore, an object of the present invention is to provide a stirrer that can reduce the risk of intrusion of foreign matter and the like with a simple configuration, reduce maintenance work, and is excellent in usability.

Means for Solving the Problems To achieve the above object, an invention according to claim 1 includes a housing, a motor housed in the housing with a rotation shaft facing forward, a rotation blade driven by the motor, and a detachable mixing blade protruding from the housing. A possible final output shaft, a fan rotated by rotation of the rotating shaft, and a battery pack arranged at the lower part of the housing, and the outside air is rotated by the fan to a predetermined area of the housing except the side surface below the motor in the housing. A suction port for suction is provided.
In order to achieve the above object, the invention according to claim 2 provides a housing, a motor housed in the housing with a rotating shaft facing forward, a rotating blade driven by the motor, and a detachable mixing blade protruding from the housing. A possible final output shaft, a fan that is rotated by rotation of the rotating shaft, and a battery pack that is arranged at the lower part of the housing, and are sucked by the rotation of the fan into a predetermined area of the housing below the motor and excluding the side surface. The air outlet is provided.
According to a third aspect of the present invention, in the configuration of the first or second aspect, a damming rib is provided on a side surface of the housing to suppress movement of the material to be stirred attached to the side surface to the intake port side or the exhaust port side. It is characterized by having been done.
According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the intake port or the exhaust port is provided on a front surface of the housing, and a guard plate is mounted in front of the housing to provide an intake port. Alternatively, at least a part of the formation region of the exhaust port is covered with a guard plate in a front view.
According to a fifth aspect of the present invention, there is provided a housing, a motor accommodated in the housing with a rotation shaft facing forward, a final output shaft that is driven to rotate by the motor, protrudes from the housing, and on which a mixing blade can be attached and detached, A control circuit board is provided above the battery pack in the housing, including a fan that rotates by rotation of the shaft, and a battery pack that is placed below the housing.
According to a sixth aspect of the present invention, there is provided a housing, a motor accommodated in the housing with a rotating shaft facing forward, a final output shaft that is driven to rotate by the motor, protrudes from the housing and allows a mixing blade to be attached and detached, It is characterized by including a fan that rotates by rotation of a shaft, a loop-shaped handle formed at the rear of the housing, and a battery pack that is disposed below the handle.

According to the present invention, since the intake port or the exhaust port is provided in a predetermined area except for the side surface of the housing, it is possible to suppress the entry of foreign matter and the like from the intake port and the exhaust port without providing a cover using a sponge or a wire mesh. it can. Therefore, the increase in cost is suppressed, and the cooling effect of the motor can be maintained because no ventilation resistance is generated by the cover. In addition, since the maintenance required when the cover is provided is not required, the usability is improved.
Further, since the battery pack is arranged at the lower portion of the housing, the center of gravity is located at the lower side of the housing, so that the balance is improved and the operability is improved.

It is a perspective view of a stirrer. It is a center longitudinal cross-sectional view of a stirrer. FIG. 3 is an enlarged view of a lower connecting portion of FIG. 2. It is a side view of the stirrer which opened the battery cover. It is a side view of the stirrer attached with the mixing blade. It is a side view of the stirrer which shows the state which visually recognizes the front surface of a battery pack with the mirror of a battery cover.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an example of a stirrer, and FIG. 2 is a central longitudinal sectional view. The stirrer 1 includes a main body housing 2 having a tubular motor housing portion 3 for housing a brushless motor 5 and a handle 4 provided at a rear portion thereof, and a front housing 6 assembled to a front side of the main body housing 2. Have. Between the main body housing 2 and the front housing 6, there is provided a gear case 7 which accommodates the planetary gear reduction mechanism 8 and is screwed to the front housing 6 from behind, and the front housing 6 serves as a final output shaft. The spindle 9 is held and its front end is projected forward. At the front end of the spindle 9, a shaft holder 10 for coupling a shaft 81 provided on a mixing blade 80 described later is provided. A side handle 11 is attached to the front housing 6, and a guard plate 12 that covers the entire front housing 6 and a part of the main body housing 2 in a front view except for a penetrating portion of the spindle 9 is fitted. .

The main body housing 2 is assembled by fixing a pair of left and right half housings 2a, 2b with left and right screws 13, 13,..., And the front housing 6 is attached to the motor housing portion by screws 14, 14,. It is fixed to 3. The motor housing 3 is also constituted by half housings 2a and 2b.
The handle 4 includes a grip portion 15 extending vertically at a rear end, an upper connecting portion 16 extending forward from an upper end of the grip portion 15 and connected to a rear portion of the motor housing portion 3, and a front lowering portion from a lower end of the grip portion 15. A battery mounting portion 17 that is inclined and extends forward, and a lower connecting portion 18 that extends obliquely upward and forward from the upper surface of the battery mounting portion 17 and that is connected to a lower portion of the motor housing portion 3 is formed in a loop shape. I have. A switch 19 is provided on the grip 15 so that the trigger 20 protrudes forward. Above the switch 19, a lock lever 21 for restricting the trigger 20 from being pushed in a normal state and allowing the trigger 20 to be pushed by a release operation. Is provided. On the left side of the switch 19, a lock-on button 19a is provided, which is operated from the left side of the main body housing 2 to maintain the pressed state of the trigger 20. The protrusion of the trigger 20 from the grip portion 15 is covered by a rubber cover 22.

The battery mounting section 17 is capable of slidingly mounting the battery pack 23 from behind, and has a terminal block 24 electrically connected to the mounted battery pack 23 and a control circuit board 26 positioned above the terminal block 24. The controller 25 provided is housed in a posture inclined forward and downward like the battery mounting unit 17. A hanging hook 27 is screwed to the right side surface of the battery mounting portion 17, and the hanging hook 27 can be replaced on the left side surface of the battery mounting portion 17.
Further, the battery mounting portion 17 is provided with a battery cover 28 that covers the mounted battery pack 23 from below. The battery cover 28 has a cover-side projection 29 protruding from the upper front part thereof and a pair of mounting part-side projections 30 protruding from the lower left part of the front surface of the battery mounting part 17 on both left and right sides thereof by means of hinge screws 31. A hook button 32 that elastically engages with the lower rear end of the battery mounting part 17 is integrally formed on the upper rear end of the battery cover 28 in a box shape to be connected. Further, a mirror 33 (FIG. 6) is provided on the inner bottom surface of the battery cover 28.

The brushless motor 5 is an inner rotor type including a stator 35 and a rotor 36 inside the stator 35. The stator 35 is provided on a cylindrical stator core 37 formed of a plurality of laminated steel plates and on end faces of the stator core 37 in the front and rear directions in the axial direction. , A front insulator 38 and a rear insulator 39, and coils 40, 40,... Wound around the stator core 37 via the front and rear insulators 38, 39. The rear insulator 39 has a sensor circuit board 41 on which a rotation detecting element (not shown) for detecting the position of the permanent magnet 44 provided on the rotor 36 and outputting a rotation detection signal is mounted at right angles to the rotation axis 42 of the rotor 36. It is attached in a shape.
The rotor 36 has a rotating shaft 42 located at the shaft center, a substantially cylindrical rotor core 43 that is disposed around the rotating shaft 42 and is formed by stacking a plurality of steel plates, and a plate-shaped fixed inside the rotor core 43. Have permanent magnets 44, 44,... The rear end of the rotary shaft 42 is supported by a bearing 45 held on the inner surface of the handle 4, and the front end is supported by a bearing 47 held by a cap 46 that closes the rear part of the gear case 7, and a pinion 48 is provided. Is protruded into the gear case 7. A centrifugal fan 49 is attached to a portion of the rotating shaft 42 behind the bearing 47.

As shown in FIG. 3, two rear holding ribs 50 a and 50 b erected on the inner surfaces of the half housings 2 a and 2 b to hold the front and rear ends of the stator 35, respectively. A front holding rib 51 for holding the front insulator 38 is formed in a vertical direction. The front holding rib 51 defines a fan accommodating chamber 52 for accommodating the centrifugal fan 49 between the cap 46 and the cap 46. The lower end of the front holding rib 51 is bent rearward and connected to the lower end of the rear holding rib 50a, and the lower ends of the rear holding ribs 50a and 50b approach each other as they go downward, and are below the stator core 37. It is connected.
On the inner surfaces of the respective half housings 2a, 2b, the holding ribs 50a, 50b, which are connected to each other, extend below the stator core 37 in the lower connecting portion 18 and then bend forward to be bent forward. The front partition ribs 53 connected to the front inner surface are integrally extended. On the front surface of the lower connecting portion 18, exhaust ports 54, 54... Extending in the left-right direction are provided above the connection portion with the front partition rib 53, and left and right around the mating surface between the half housings 2 a, 2 b. A plurality of rows (here, four rows) are formed symmetrically and at equal intervals in the vertical direction. Therefore, an exhaust path 55 is formed on the front side of the front partition rib 53 and communicates with the fan accommodating chamber 52 and is capable of discharging air sent from the centrifugal fan 49 to the outside through the exhaust port 54 to the outside.

On the inner surface of each of the half housings 2a and 2b, behind the front partition rib 53, it extends rearward from the front inner surface of the lower connecting portion 18 near the connection portion with the battery mounting portion 17, and then substantially upward at a right angle. The rear connecting ribs 56 extend upward in a manner of dividing the inside of the lower connecting portion 18 back and forth, and the rear partition ribs 56 whose upper ends are located behind the front partition ribs 53 and lower than the stator 35 are integrally extended. ing. On the front surface of the lower connecting portion 18, between the front partition rib 53 and the rear partition rib 56, intake ports 57, 57... Extending in the left-right direction are centered on the mating surface between the half housings 2 a, 2 b. They are formed symmetrically and at equal intervals in a plurality of rows (five rows in this case) in the vertical direction. Therefore, an intake path 58 is formed between the front partition rib 53 and the rear partition rib 56 to take in outside air from the intake port 57 and suction from the rear of the stator 35 with the rotation of the centrifugal fan 49.
Further, on the left and right side surfaces of the lower connecting portion 18, as shown in FIG. 4, behind the exhaust port 54 and the intake port 57, and forward from the upper surface of the battery mounting portion 17 at the same inclination as the lower connecting portion 18. A pair of dam ribs 59, 59 extending obliquely upward, bending forward above the exhaust port 54, and reaching forward from the exhaust port 54 are formed.

  A wiring space 60 is formed between the rear partition rib 56 and the rear inner surface of the lower connecting portion 18 to allow communication between the inside of the battery mounting portion 17 and the rear portion of the stator 35 in the motor housing portion 3. In this wiring space 60, as shown in FIGS. 2 and 3, a plurality of power lines (lead wires) for electrically connecting between the control circuit board 26 and each terminal 61 provided on the rear insulator 39 of the stator 35. , And a plurality of signal lines (lead wires) 63, 63... For electrically connecting between the control circuit board 26 and the sensor circuit board 41. Further, a plurality of lead wires 64, 64... For electrically connecting between the terminal block 24 and the control circuit board 26 are arranged below the rear partition rib 56. In this case, since the controller 25 is supported in the battery mounting portion 17 at a downward slant, a wide wiring space for the lead wire 64 can be secured, and the power supply line 62, the signal line 63, and the lead wire into the lower connecting portion 18 can be secured. 64 wirings can be easily performed. 2 and 3, one power supply line 62, one signal line 63, and one lead wire 64 are shown, and other lead wires are omitted.

On the other hand, the planetary gear reduction mechanism 8 in the gear case 7 is provided with three stages of carriers 71A to 71C that support the plurality of planetary gears 72, 72 in the internal gears 70A to 70C, respectively. The planet gear 72 of the carrier 71A meshes with the pinion 48 of the rotating shaft 42. The third-stage carrier 71 </ b> C is coupled to the rear end of the spindle 9 supported by front and rear bearings 65, 65 in the front housing 6.
The internal gear 70B meshing with the planetary gear 72 of the second-stage carrier 71B is provided rotatably and movably in the axial direction, and a mode switching ring 73 is engaged with the outer periphery of the internal gear 70B. I have. The mode switching ring 73 includes a holding piece 74 that is held between the front and rear coil springs 75 and protrudes downward. A switching dial 76 having an eccentric pin 77 on the upper surface is rotatably provided on the lower surface of the main body housing 2, and the holding piece 74 of the mode switching ring 73 is interlocked with the movement of the eccentric pin 77 in the front-rear direction. Can be moved back and forth.

  Therefore, when the mode switching ring 73 is advanced by rotating the switching dial 76, the internal gear 70B is engaged with the engagement ring 78 provided in the gear case 7 to restrict the rotation, and the rotation of the second stage carrier 71B is prevented. The low-speed mode is achieved in which the planetary gear 72 is caused to perform planetary motion to reduce the speed of the second stage. On the other hand, when the mode switching ring 73 is retracted by rotating the switching dial 76, the internal gear 70B is separated rearward from the engagement ring 78 to engage with the first-stage carrier 71A, and the second-stage planetary gear 72 Is rotated integrally with the first-stage carrier 71A to enter the high-speed mode in which the second-stage deceleration is canceled.

  In the stirrer 1 configured as described above, the battery cover 28 is opened and the battery pack 23 is mounted on the battery mounting portion 17 as shown in FIG. 4, and the battery cover 28 is closed, as shown in FIG. A shaft 81 provided on a mixing blade 80 is connected to a front end of the spindle 9 via a shaft holder 10. In this state, when the switch 20 is turned on by pressing the trigger 20, the control circuit board 26 of the controller 25 performs the operation based on the detection signal of the permanent magnet 44 obtained from the rotation detection element provided on the sensor circuit board 41. The rotational position of the rotor 36 is acquired, and the rotor 36 is rotated by sequentially supplying current to the switching elements mounted on the control circuit board 26 based on the rotational position. Accordingly, the rotation reduced by the planetary gear reduction mechanism 8 by the rotation of the rotating shaft 42 is transmitted to the spindle 9, and the mixing blade 80 coupled to the spindle 9 rotates to allow the stirring of the material to be stirred.

When the rotation shaft 42 rotates and the centrifugal fan 49 rotates, the fan housing chamber 52 becomes a negative pressure, and the outside air is sucked from the intake port 57. The sucked outside air passes through the intake passage 58, passes through the space between the stator 35 and the rotor 36 from behind the brushless motor 5, cools the brushless motor 5, reaches the fan housing 52, and passes through the exhaust passage 55. The air is discharged from the exhaust port 54 to the outside. Since the intake port 57 and the exhaust port 54 are vertically separated from each other on the front surface of the lower connecting portion 18, it is difficult for the exhaust gas from the exhaust port 54 to be sucked from the intake port 57.
In addition, since the intake port 57 and the exhaust port 54 are open at the front surface of the lower connecting portion 18, even if the stirrer 1 is placed on the ground or the like, the intake port 57 and the exhaust port 54 are directly connected to the ground or the like. No contact. Therefore, the possibility that foreign matter or the like enters from the intake port 57 or the exhaust port 54 is reduced.

Further, even if the material to be stirred adheres to the outer surfaces of the motor accommodating portion 3 and the handle 4 due to the stirring operation, the material to be stirred is supplied to the intake port 57 and the exhaust port 54 by the damming rib 59 provided on the lower connecting portion 18. The flow is blocked. Therefore, the possibility that the material to be stirred will enter the inlet 57 and the outlet 54 along the surface of the lower connecting portion 18 is also reduced.
The guard plate 12 covers the entire area where the exhaust port 54 is formed and covers a part of the upper side of the area where the intake port 57 is formed (overlaps in the front-rear direction) when viewed from the front. The possibility that the material to be stirred scattered during the operation reaches the intake port 57 and the exhaust port 54 is also reduced.

  On the other hand, in the battery mounting portion 17, since the entire battery pack 23 is covered by the battery cover 28, there is no possibility that the material to be stirred adheres to the battery pack 23 or enters the terminal block 24 side. When the battery cover 28 is opened, the front surface of the battery pack 23 can be viewed from behind by the mirror 33 provided on the bottom surface of the battery cover 28 as shown in FIG. Therefore, the remaining capacity display unit (not shown) provided on the front surface of the battery pack 23 can be easily visually recognized without tilting the stirrer 1 or bending the body by the operator.

  As described above, according to the stirrer 1 of the above-described embodiment, the suction port 57 that sucks outside air by the rotation of the fan (centrifugal fan 49) is provided on the lower front surface of the motor (brushless motor 5) in the housing (body housing 2). By providing the exhaust port 54 for the air sucked by the rotation of the centrifugal fan 49, entry of foreign matter and the like from the intake port 57 and the exhaust port 54 can be suppressed without providing a cover using a sponge or a wire mesh. Therefore, the increase in cost is suppressed, and the cooling effect of the brushless motor 5 can be maintained because no ventilation resistance is generated by the cover. In addition, since the maintenance required when the cover is provided is not required, the usability is improved. Further, since the intake port 57 and the exhaust port 54 can be arranged intensively at the lower connecting portion 18, the design unity is improved.

In particular, here, a damming rib 59 is provided on the side surface of the main body housing 2 for suppressing the movement of the material to be stirred attached to the side surface to the suction port 57 side and the exhaust port 54 side. Intrusion of the material to be stirred into the intake port 57 and the exhaust port 54 can also be effectively suppressed.
The intake port 57 and the exhaust port 54 are provided on the front surface of the main body housing 2, while the guard plate 12 is mounted in front of the main body housing 2, and a part of the formation area of the intake port 57 and the exhaust port 54 are formed. Since the entire formation region is covered with the guard plate 12 in a front view, it is possible to more effectively suppress the intrusion of the material to be stirred into the intake port 57 and the exhaust port 54.

In the stirrer 1, since the battery pack 23 is disposed below the main body housing 2, the center of gravity is located on the lower side, so that the balance of the main body housing 2 is improved and the operability is improved. In particular, since the control circuit board 26 is disposed above the battery pack 23, a more stable feeling can be obtained.
In addition, since the battery pack 23 is arranged below the loop-shaped handle 4, wiring inside the handle 4 is also easy.

In addition, the number, shape, and formation region of the intake port and the exhaust port are not limited to the above-described embodiment. For example, in the above embodiment, the centrifugal fan is provided on the front side of the stator and the exhaust port is arranged on the upper side, and the intake port is arranged on the lower side. May be provided on the upper side. When the intake port and the exhaust port are adjacent to each other, the opening may be formed by being inclined so as to be opposite to each other in the thickness direction of the housing. The fan is not limited to the centrifugal fan.
Furthermore, the formation region of the intake port and the exhaust port is not limited to the front surface of the housing, but may be another region such as the rear surface of the lower connecting portion as long as it is a region excluding the side surface.
On the other hand, the shape of the lower connecting portion is not limited to the above-described embodiment, and the intake port and the exhaust port can be formed on the front surface even if the lower connecting portion has a linear shape extending in the vertical direction without being inclined. The shape of the damming rib may be changed or omitted.

  For other configurations, the battery mounting part and the controller are not tilted forward and downward, the hinge of the battery cover is reversed, the battery cover is transparent, and the presence or absence of the battery pack is easily visible. Changes are possible. The battery cover itself can be omitted. A motor other than a brushless motor can be used.

  1 stirrer, 2 body housing, 3 motor housing, 4 handle, 5 brushless motor, 6 front housing, 8 planetary gear reduction mechanism, 9 spindle, 15 ··· Grip part, 17 ·· Battery mounting part, 18 ··· Lower connecting part, 26 ··· Control circuit board, 35 ··· Stator, 36 ··· Rotor, 42 ··· Rotating shaft, 49 ··· Centrifugal fan, 53 · Front rib, 54, exhaust port, 55, exhaust path, 56, rear rib, 57, intake port, 58, intake path, 59, damming rib, 60, wiring space, 80・ ・ Mixing blade.

Claims (6)

A housing,
A motor housed in the housing with a rotation axis facing forward,
A final output shaft that is driven to rotate by the motor and that detaches the mixing blade protruding from the housing,
A fan that rotates by rotation of the rotation shaft,
A battery pack disposed at a lower portion of the housing,
An agitator characterized in that a suction port for sucking outside air by rotation of the fan is provided in a predetermined region of the housing below the motor and excluding a side surface. A housing,
A motor housed in the housing with a rotation axis facing forward,
A final output shaft that is driven to rotate by the motor and that detaches the mixing blade protruding from the housing,
A fan that rotates by rotation of the rotation shaft,
A battery pack disposed at a lower portion of the housing,
An agitator characterized in that an exhaust port for air sucked by rotation of the fan is provided in a predetermined area of the housing below the motor and excluding a side surface.   3. The side wall of the housing is provided with a damming rib that suppresses movement of the material to be stirred attached to the side surface to the intake port side or the exhaust port side. 4. Stirrer.   The intake port or the exhaust port is provided on a front surface of the housing, while a guard plate is mounted in front of the housing, and at least a part of a formation region of the intake port or the exhaust port is viewed from the front. The stirrer according to any one of claims 1 to 3, wherein the stirrer is covered with the guard plate. A housing,
A motor housed in the housing with a rotation axis facing forward,
A final output shaft that is driven to rotate by the motor and that detaches the mixing blade protruding from the housing,
A fan that rotates by rotation of the rotation shaft,
A battery pack disposed at a lower portion of the housing,
A stirrer, wherein a control circuit board is disposed above the battery pack in the housing. A housing,
A motor housed in the housing with a rotation axis facing forward,
A final output shaft that is driven to rotate by the motor and that detaches the mixing blade protruding from the housing,
A fan that rotates by rotation of the rotation shaft,
A loop-shaped handle formed at the rear of the housing;
A stirrer comprising a battery pack disposed below the handle.

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