JP3735048B2 - Electric blower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hand-held electric blower that rotates an impeller by an electric motor.
[0002]
[Prior art]
An electric blower that pumps air by the rotational movement of an impeller is known. The electric blower includes a blower body having an impeller and an electric motor, and a handle coupled to the blower body.
[0003]
As a method for controlling the speed of the electric motor in the electric blower, there are a control for making the speed constant and a control for changing the speed. In the control to keep the speed constant, it is only necessary to provide a switch that opens and closes the circuit of the motor. However, in the control that changes the speed, a switch that opens and closes the circuit of the motor and a speed adjustment unit that changes the speed of the motor. Both are needed.
[0004]
In a conventional electric blower that can be held by hand, a switch for opening and closing the circuit of the electric motor is provided on the handle in consideration of its operability. In consideration of cost, storage space, and the like, a speed adjusting unit that changes the speed of the electric motor is formed integrally with the switch provided on the handle. Specifically, the speed of the motor is adjusted by the pull amount of the switch trigger. For example, the speed of the motor is increased by increasing the pulling amount of the trigger, and the speed of the motor is decreased by decreasing the pulling amount. In order to keep the adjusted speed constant, the pulling amount is limited so that the trigger cannot be pulled more than a predetermined amount by the dial, and the trigger is fixed at the position where the pulling amount is limited by the lock button.
[0005]
[Problems to be solved by the invention]
There are times when it is desired to change the speed of the motor after locking the trigger in place. In such a case, it is necessary to adjust the trigger pull amount by operating the dial. However, in a conventional electric blower in which the switch and speed control unit are integrated, it is difficult to rotate the dial after fixing the trigger with the lock button, and the dial is small and difficult to work. It was practically impossible to adjust.
[0006]
Therefore, in order to adjust the speed, it is necessary to release the lock button once and allow the trigger to move freely, then adjust the trigger pull amount again with the dial, and fix the trigger with the lock button again. The work was troublesome.
[0007]
Therefore, an object of the present invention is to provide an electric blower that can be easily operated even when the speed of the electric motor is changed in a hand-held electric blower.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present inventor is a hand-held electric blower that rotates an impeller by an electric motor, the blower main body having the electric motor and the impeller, and a handle coupled to the blower main body, A switch for the electric motor and a speed adjusting unit for controlling the speed of the electric motor , wherein the switch and the speed adjusting unit are separated from each other , and the handle is coupled to the electric motor provided in the blower body. The connecting portion between the handle and the electric motor is provided with a communication port that communicates the internal space of the handle and the internal space of the electric motor, and outside air is taken in around the speed adjusting unit or in the speed adjusting unit. a gap is provided by an electric blower, wherein a heat radiating plate of the speed adjusting unit is arranged between the gap and the electric motor, the solution the above problems It was.
[0009]
Further, the present inventor has provided the switch in the handle grip portion and the speed adjustment portion in the vicinity of the grip portion so that the switch and the speed adjustment portion can be operated more easily. Specifically, according to a second aspect of the present invention, in the electric blower according to the first aspect, the handle extends in a direction that intersects the grip portion that is gripped by a hand and the grip portion, and the grip portion extends to the electric motor. The switch is provided in the grip part, and the speed adjusting part is provided in the support part located on the outlet side of the electric blower.
[0010]
According to a third aspect of the present invention, in the electric blower according to the second aspect, the support portion on the outlet side is thicker than the grip portion.
[0013]
Furthermore, the invention of claim 4 is a hand-held electric blower that rotates an impeller by an electric motor, the blower body having the electric motor and the impeller, a handle coupled to the electric motor, and a handle provided on the handle A speed adjusting unit that controls the speed of the electric motor, and a connection port that connects the inside of the handle and the inside of the electric motor is provided at a coupling portion between the handle and the electric motor, and the periphery of the speed adjusting unit Alternatively, the speed adjusting unit is provided with a gap through which outside air is taken in, and a radiator plate of the speed adjusting unit is disposed between the gap and the electric motor. did.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an electric blower according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a plan view (including a partial cross-section) of the electric blower, and FIG. 2 shows a side view (including a partial cross-sectional view) of the electric blower. The electric blower includes a blower body 4 and a handle 5 coupled to the blower body 4. By rotating the impeller 2 directly connected to the drive shaft 6 of the electric motor 1, air is taken in from the suction port 7, and the pressure is increased to blow out from the blowout port 8. This electric blower is used as a kind of electric tool, and is small and lightweight so that it can be held by hand.
[0015]
The blower body 4 rotates the fan housing 3 having the suction port 7 and the blowout port 8, the impeller 2 housed in the fan housing 3, the drive shaft 6 coupled to the impeller 2, and the drive shaft 6. An electric motor 1 is provided. The electric motor 1 is attached to the side surface of the fan housing 3. A handle 5 is coupled to the electric motor 1.
[0016]
Inside the substantially disc-shaped fan housing 3, a vortex chamber 9 is formed in which the suction port 7 and the blowout port 8 communicate with each other. The suction port 7 is formed on the side surface of the fan housing 3 on the center line of the impeller 2. On the other hand, the outlet 8 is formed so as to extend from the peripheral wall of the spiral chamber 9 in the tangential direction of the impeller 2. An attachment portion 8 a to which accessories such as a dust bag or a nozzle are attached is formed on the tip end side of the blowout port 8.
[0017]
The fan housing 3 is formed with a dividing surface extending in a direction perpendicular to the axis of the impeller 2, and the fan housing 3 is divided into two in the direction of the axis of the impeller 2 by the dividing surface. The divided bodies 3a and 3b of the fan housing 3 are manufactured by injection molding or the like of engineering plastics such as polycarbonate and nylon, and are coupled by coupling means such as bolts.
[0018]
The impeller 2 accommodated in the divided bodies 3a and 3b is a so-called centrifugal impeller that causes the sucked air to generate a flow perpendicular to the axis line of the impeller 2.
[0019]
The drive shaft 6 is fixed to the center of the impeller 2 by fixing means such as press-fitting and bolt coupling. The drive shaft 6 extends to the inside of the electric motor 1. One end of the drive shaft 6 is rotatably supported by a bearing provided in the electric motor 1, and the other end is rotatably supported by a bearing provided in the fan housing 3.
[0020]
The electric motor 1 includes a substantially cylindrical motor housing 11 coupled to the fan housing 3 by bolts and the like, a stator 12 mounted in the motor housing 11, a drive shaft 6 and an inner side of the stator 12. And a rotor 13 to be arranged.
[0021]
An opening 14 (see FIG. 7) capable of taking in outside air is opened in the side surface 11a of the motor housing 11. A communication port 15 that communicates the internal space of the motor housing 11 and the internal space of the fan housing 3 is provided on the side surface of the fan housing 3 to which the motor housing 11 is coupled. When the impeller 2 is rotated, negative pressure is generated in the fan housing 3, and outside air is taken in from the opening 14 of the motor housing 11. The taken-in outside air is introduced into the fan housing 3 through the communication port 15. The rotor 13 and the like of the electric motor 1 are cooled by this air flow.
[0022]
The handle 5 attached to the motor housing 11 is elongated in a plane parallel to a plane orthogonal to the axis of the impeller 2 so that the outlet 8 is easily directed toward the object. The handle 5 has a generally arcuate shape, and includes a grip portion 5 a that is gripped by a hand, and a pair of support portions 5 b and 5 c that extend in a direction intersecting the grip portion 5 a and connect the grip portion 5 a to the electric motor 1. (See FIGS. 6 and 7). The pair of support portions 5b, 5c are elongated in the radial direction of the impeller 2 and are arranged at an interval of 90 ° in the circumferential direction. The support portion 5b on the side close to the blowout port 8 extends in a direction substantially orthogonal to the direction in which the blowout port 8 extends, and the other support portion 5c extends in a direction substantially parallel to the direction in which the blowout port 8 extends. In the state where the electric blower is held by hand, the support portion 5b on the outlet 8 side is positioned forward, and the support portion 5c on the side opposite to the outlet 8 is positioned rearward.
[0023]
Moreover, the support part 5b by the side of the blowing outlet 8 is formed thicker than the grip part 5a. That is, the cross-sectional area outside the support portion 5b is larger than the cross-sectional area outside the grip portion 5a. Further, as the support portion 5b is formed thicker than the grip portion 5a, the cross-sectional area of the internal space of the support portion 5b is larger than the cross-sectional area of the internal space of the grip portion 5a. In addition, the support part 5c on the opposite side to the outlet 8 is formed substantially the same as the thickness of the grip part 5a.
[0024]
This electric blower is used to perform a blowing operation or a suction operation. FIG. 3 shows an electric blower in which a nozzle 16 is attached to the outlet 8 in order to perform the blowing operation. 4 and 5 show an electric blower in which a dust collection bag 17 is attached to the outlet 8 in order to perform a suction operation. For example, when used in a blowing operation for blowing dust, small pieces of wood, etc., as shown in FIG. 3, an accessory nozzle 16 is attached to the blowing port 8 of the electric blower. Then, the tip of the nozzle 16 is directed toward an object such as dust or a small piece of wood, and air with increased pressure is blown out from the nozzle 16. On the other hand, when used for a suction operation for collecting dust, small pieces of wood, etc., an accessory dust collection bag 17 is attached to the outlet 8 of the electric blower, and an accessory nozzle 16 is attached to the inlet 7. Then, the tip of the nozzle 16 is directed to an object such as dust or a small piece of wood, and the object is sucked and collected in the dust bag 17.
[0025]
The electric blower is used for both the blowing work and the sucking work as described above, but is mainly used for the blowing work. When performing the blowing operation, the tip of the nozzle 16 attached to the blowing port 8 is usually used with the tip directed toward the blow target.
[0026]
By making the plane perpendicular to the axis of the impeller 2 and the plane on which the handle 5 is located substantially parallel, the direction in which air is blown from the outlet 8 and the plane on which the handle 5 is located are parallel. For this reason, especially when performing blowing work, it becomes easy to point the blower outlet 8 of an electric blower to a target object.
[0027]
6 and 7 show a manual switch 18 and a speed adjusting unit 19 provided on the handle 5. The switch 18 opens and closes the circuit of the electric motor 1, and the speed adjusting unit 19 controls the speed of the electric motor 1. The switch 18 and the speed adjusting unit 19 are separated from each other. The switch 18 is provided in the grip portion 5a of the handle 5, and the speed adjusting portion 19 is provided in the support portion 5b on the outlet 8 side. The switch 18 and the speed adjusting unit 19 are connected in series between the power source and the electric motor 1. The speed adjusting unit 19 changes the primary voltage by changing the primary voltage by phase control of the thyristor, etc., and changing the torque characteristic, and the voltage and frequency of the primary input are changed by using a power conversion device such as an inverter or a cyclone converter. The primary frequency control method to be used is adopted.
[0028]
By separating the switch 18 and the speed adjusting unit 19, the speed adjusting unit 19 can be operated separately from the switch 18 while the switch 18 of the electric motor 1 is kept on, and therefore the speed of the electric motor 1 is changed. The operation becomes easier. Further, since the switch 18 is disposed on the grip portion 5a and the speed adjustment portion 19 is disposed on the support portion 5b in front of the grip portion 5a, the speed adjustment portion 19 is operated with a finger while holding the grip portion 5a with a hand. Can be operated more easily. Furthermore, since the support part 5b on the outlet 8 side is thicker than the grip part 5a, the speed adjusting part 19 can be arranged on the support part 5b while maintaining the ease of gripping the grip part 5a. .
[0029]
In consideration of operability, the switch 18 is often provided on the outlet 8 side of the grip portion 5a. However, by providing the speed adjusting portion 19 on the support portion 5b on the outlet 8 side, the switch 18 from the motor 1 is provided. The wiring up to can be shortened. On the other hand, if the speed adjusting part 19 is provided on the support part 5c on the side opposite to the outlet 8, the wiring from the electric motor 1 to the switch 18 becomes long.
[0030]
FIG. 8 shows a detailed view of the speed adjustment unit 19. The speed adjusting unit 19 includes a dial 20 (volume adjusting mechanism) that is knurled on the outer peripheral surface. A part of the dial 20 is exposed to the outside through a window 21 formed in the handle 5. The speed of the electric motor 1 is controlled by rotating the dial 20 from the outside.
[0031]
A connecting portion between the handle 5 and the motor housing 11 of the electric motor 1 is provided with a communication port 22 that communicates the internal space of the handle 5 and the internal space of the electric motor 1. On the other hand, a slight gap 23 for taking in outside air is opened between the periphery of the dial 20 of the speed adjusting unit 19 and the window 21. A heat radiating plate 24 of the speed adjusting unit 19 is disposed between the gap 23 and the electric motor 1. The heat radiating plate 24 is provided to cool components having heat such as a thyristor of the speed adjusting unit 19.
[0032]
As described above, when the impeller 2 is rotated, outside air is taken in from the opening of the motor housing 11 due to the negative pressure inside the fan housing 3. At the same time, outside air is taken in from the gap 23 of the handle 5. The outside air taken in from the gap 23 is guided to the internal space of the motor housing 11 and thus the internal space of the fan housing 3 through the communication port 22. As a result, air flows from the gap 23 around the dial 20 toward the electric motor 1 in the internal space of the handle 5. Since the heat sink 24 is disposed in the middle of the air flow, the heat sink can be efficiently cooled. Note that the gap 23 may not be provided around the dial 20 but may be provided in the speed adjustment unit 19 itself.
[0033]
【The invention's effect】
According to the first aspect of the present invention, since the switch and the speed adjusting unit are separated from each other, the speed adjusting unit can be operated separately from the switch while the switch of the motor is turned on. The operation when changing is facilitated .
In addition, since there is a part having heat such as a thyristor in the circuit of the speed adjusting unit, a heat sink for cooling the part having heat is required. According to the first aspect of the present invention, air flows from the gap around the speed adjuster (for example, around the dial of the speed adjuster) or the gap of the speed adjuster itself toward the motor, and the heat sink is arranged in the middle of this flow. Therefore, the heat sink can be efficiently cooled.
[0034]
According to the invention of claim 2, since the switch is arranged at the grip part and the speed adjusting part is arranged at the support part on the outlet side in front of the grip part, the speed is adjusted by a finger while holding the grip part by hand. The unit can be operated, and the operation becomes easier. In consideration of operability, the switch is often provided in the grip part on the outlet side, but the speed adjustment part is provided in the support part on the outlet side, so that the wiring from the motor to the switch can be shortened. it can.
[0035]
Furthermore, according to the invention of claim 3, since the grip portion of the handle is thinner than the support portion and the support portion is thicker than the grip portion, the grip portion can be easily supported while maintaining the ease of gripping. A speed adjusting unit can be arranged.
[0038]
According to the invention of claim 4 , air flows from the gap around the speed adjusting portion (for example, around the dial of the speed adjusting portion) or the gap of the speed adjusting portion itself toward the motor, and the heat sink is in the middle of this flow. Therefore, the heat sink can be efficiently cooled.
[Brief description of the drawings]
FIG. 1 is a plan view (including a partial cross section) illustrating an electric blower according to an embodiment of the present invention.
FIG. 2 is a side view of the electric blower (including a partial cross section).
FIG. 3 is a side view showing an electric blower to which a nozzle is attached.
FIG. 4 is a side view showing an electric blower to which a dust bag is attached.
FIG. 5 is a plan view showing an electric blower to which a dust bag is attached.
FIG. 6 is a left side view of the electric blower.
FIG. 7 is a right side view of the electric blower.
FIG. 8 is a diagram showing a speed adjustment unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electric motor 2 ... Impeller 4 ... Blower main body 5 ... Handle 18 ... Switch 19 ... Speed control part 5a ... Grip part 5b, 5c ... Support part 8 ... Outlet 22 ... Communication port 23 ... Gap 24 ... Heat sink

Claims (4)

A hand-held electric blower that rotates an impeller by an electric motor,
A blower main body having the electric motor and the impeller, a handle coupled to the blower main body, a switch of the electric motor, and a speed adjusting unit for controlling the speed of the electric motor ,
The switch and the speed adjustment unit are separated from each other ;
The handle is coupled to the electric motor provided in the blower body,
A connecting portion that connects the internal space of the handle and the internal space of the electric motor is provided at a coupling portion between the handle and the electric motor,
Around the speed adjusting unit or the speed adjusting unit, a gap for taking in outside air is provided,
An electric blower characterized in that a heat radiating plate of the speed adjusting unit is disposed between the gap and the electric motor . The handle includes a grip portion that is gripped by a hand, and a pair of support portions that extend in a direction intersecting the grip portion and connect the grip portion to the electric motor,
The switch is provided on the grip;
2. The electric blower according to claim 1, wherein the speed adjustment unit is provided in the support portion that is located on a blower outlet side of the electric blower.   The electric blower according to claim 2, wherein the support portion on the outlet side is thicker than the grip portion. A hand-held electric blower that rotates an impeller by an electric motor,
A blower body having the electric motor and the impeller, a handle coupled to the electric motor, and a speed adjusting unit provided on the handle for controlling the speed of the electric motor,
A communication port that communicates the inside of the handle and the inside of the electric motor is provided at a coupling portion between the handle and the electric motor,
A gap around which outside air is taken in is provided around the speed adjusting unit or in the speed adjusting unit,
An electric blower characterized in that a heat radiating plate of the speed adjusting unit is disposed between the gap and the electric motor.

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