JP2021080848A - Blower - Google Patents

Abstract

To disclose a technique for inhibiting a control board from becoming a high temperature.SOLUTION: A blower can include a casing, a motor, a centrifugal fan, and a control board. The casing can have a first storage chamber and a second storage chamber communicated with each other via an opening inside. The motor arranged in the first storage chamber can have a rotary shaft inserted through the opening. The centrifugal fan arranged in the second storage chamber can be rotated around the rotary shaft by the drive of the motor. The control board arranged in the first storage chamber can control the drive of the motor. The casing communicating the first storage chamber and the second storage chamber can further have a communication hole arranged away from the opening.SELECTED DRAWING: Figure 3

Description

The techniques disclosed herein relate to blowers.

Patent Document 1 discloses a blower. The blower includes a casing, a motor, a centrifugal fan, and a control board. The casing has a first storage chamber and a second storage chamber that communicate with each other through the opening. The motor is arranged in the first accommodation chamber, and the rotating shaft is inserted through the opening. The centrifugal fan is arranged in the second accommodating chamber and rotates about the rotation axis by driving the motor. The control board is arranged in the first accommodation chamber and controls the driving of the motor. The casing has an intake port that communicates the outside of the casing with the first storage chamber. When the centrifugal fan rotates, air flows from the intake port to the first accommodation chamber, passes through the opening, and flows to the second accommodation chamber. The control board is cooled by the air flowing through the first accommodation chamber.

Japanese Unexamined Patent Publication No. 2014-148951

In the above blower, when the pressure in the second containment chamber becomes higher than the pressure in the first containment chamber, it becomes difficult for air to flow from the first containment chamber to the second containment chamber, and it becomes difficult for air to flow from the outside to the first containment chamber. Become. As a result, it becomes difficult for air to flow inside the first accommodation chamber. Therefore, the control board may not be sufficiently cooled, and the control board may become hot. This specification discloses a technique capable of suppressing the temperature of the control board from becoming high.

This specification discloses a blower. The blower includes a casing, a motor, a centrifugal fan, and a control board. The casing has a first storage chamber and a second storage chamber that communicate with each other through the opening. The motor is arranged in the first accommodation chamber, and the rotating shaft is inserted through the opening. The centrifugal fan is arranged in the second accommodating chamber and rotates about the rotation axis by driving the motor. The control board is arranged in the first accommodation chamber and controls the driving of the motor. The casing communicates the first containment chamber and the second containment chamber, and further has a communication hole arranged away from the opening.

In the above configuration, when the pressure in the second containment chamber is higher than the pressure in the first containment chamber, the air passes through the communication hole, flows from the second containment chamber to the first containment chamber, and passes through the opening. It flows from the first containment chamber to the second containment chamber. Therefore, even when the pressure in the second accommodating chamber becomes higher than the pressure in the first accommodating chamber, air flows through the first accommodating chamber, and the control substrate is sufficiently cooled by the air. As a result, it is possible to prevent the control board from becoming hot.

It is a perspective view of the blower 2 in the blowing mode of 1st Example. It is a perspective view of the trigger 24, the cruise valve 26, and the sensor 32 of the blower 2 of the first embodiment. It is a horizontal sectional view of the blower 2 in the blowing mode of 1st Example. FIG. 3 is an enlarged view of the vicinity of the communication hole 84 in FIG. It is sectional drawing of the blower 2 in the blowing mode of 1st Example. It is a left side view when the side casing 8 of the blower 2 in the blowing mode of 1st Example was removed. It is a perspective view of the blower 2 in the suction mode of 1st Example. It is a graph which shows the relationship between the trigger push-in amount and the motor rotation speed in the normal mode and the relaxation mode executed by the control board 66 of the blower 2 of 1st Example. It is a graph which shows the relationship between the trigger push-in amount and the motor rotation speed in the normal mode and the relaxation mode executed by the control board 66 of the blower 2 of the 2nd Example.

In one or more embodiments, the blower may include a casing, a motor, a centrifugal fan, and a control board. The casing may have a first storage chamber and a second storage chamber that communicate with each other through the opening. The motor is arranged in the first accommodation chamber, and the rotating shaft may be inserted through the opening. The centrifugal fan is arranged in the second accommodating chamber, and may rotate about the rotation axis by driving the motor. The control board is arranged in the first accommodation chamber, and may control the drive of the motor. The casing communicates the first accommodation chamber and the second accommodation chamber, and may further have a communication hole arranged away from the opening.

In the above configuration, when the pressure in the second containment chamber is higher than the pressure in the first containment chamber, the air passes through the communication hole, flows from the second containment chamber to the first containment chamber, and passes through the opening. It flows from the first containment chamber to the second containment chamber. Therefore, even when the pressure in the second accommodating chamber becomes higher than the pressure in the first accommodating chamber, air flows through the first accommodating chamber, and the control substrate is sufficiently cooled by the air. As a result, it is possible to prevent the control board from becoming hot.

In one or more embodiments, the communication holes may be arranged to overlap the centrifugal fan in the axial direction of rotation.

In the above configuration, the centrifugal fan pumps air outward in the radial direction. Therefore, by arranging the communication holes so as to overlap with the centrifugal fan in the direction of the rotation axis, it is possible to prevent the air sent out by the centrifugal fan from flowing through the communication holes from the second storage chamber to the first storage chamber. can do. As a result, it is possible to suppress a decrease in the blowout flow rate of the blower.

In one or more embodiments, the blower may further include a battery that powers the motor.

With the above configuration, the blower can be used even in a work area where there is no external power supply.

In one or more embodiments, the battery may be located in close proximity to the control board.

In the above configuration, the length of the wiring connecting the battery and the control board can be shortened. As a result, the wiring can be easily routed.

In one or more embodiments, the blower is located in the first containment chamber and may further include radiating fins that guide the air flowing through the first containment chamber. The heat dissipation fins may be arranged on the control board.

In the above configuration, the air is guided by the heat radiation fins and flows on the control board. As a result, the control board can be cooled efficiently. As a result, it is possible to prevent the control board from becoming hot.

In one or more embodiments, the blower may further include a cooling fan located between the opening and the centrifugal fan in the axial direction of rotation. The cooling fan may rotate with the centrifugal fan.

In the above configuration, as the cooling fan rotates, the pressure in the space near the cooling fan decreases. As a result, air can be efficiently flowed from the first storage chamber to the second storage chamber through the opening. Therefore, the flow rate of the air flowing through the first accommodation chamber increases, and the control board is efficiently cooled. As a result, it is possible to prevent the control board from becoming hot.

In one or more embodiments, the casing may have a discharge port that discharges air delivered by a centrifugal fan to the outside of the casing. The blower may further include a blower nozzle through which air discharged from the discharge port flows. The blower nozzle may be a long nozzle.

Generally, when a long nozzle is used as the blower nozzle, the pressure in the second accommodating chamber becomes high while the centrifugal fan is rotating. Therefore, in a configuration in which the blower does not have a communication hole, when the pressure in the second accommodation chamber becomes higher than the pressure in the first accommodation chamber, air passes through the opening from the first accommodation chamber to the second accommodation chamber. It may be difficult to flow. As a result, the control board may not be sufficiently cooled and may become hot. In the above configuration, since the communication hole communicates the first accommodation chamber and the second accommodation chamber, sufficient air flows through the first accommodation chamber and is controlled even when a long nozzle is used as the ventilation nozzle. The substrate is sufficiently cooled. Therefore, it is possible to prevent the control board from becoming hot.

In one or more embodiments, the control board may be arranged in the air flow path that flows through the first accommodation chamber from the communication hole towards the motor.

In the above configuration, air flows on the control board. As a result, the control board can be cooled efficiently. As a result, it is possible to prevent the control board from becoming hot.

In one or more embodiments, the blower may further include a motor housing that houses the motor. The motor housing may have a motor intake port for intake air inside the motor housing. The control board may be arranged on a virtual line connecting the communication hole and the motor intake port.

In the above configuration, the control board is located on the shortest distance between the communication hole and the motor intake port. Therefore, the control board can be cooled efficiently. As a result, it is possible to prevent the control board from becoming hot.

In one or more embodiments, the blower may include a motor, a centrifugal fan, a casing, a trigger, and a control board. The centrifugal fan may rotate about the rotation axis by the rotation of the motor. The casing houses the motor and the centrifugal fan, and air may be guided from the intake port to the discharge port as the centrifugal fan rotates. The trigger may be pushed by the operator. The control board may control the drive of the motor. The control board has a normal mode in which the rotation speed of the motor is adjusted according to the pushing amount of the trigger, and a target rotation speed lower than the maximum rotation speed of the motor when the pushing amount of the trigger in the normal mode is the maximum amount. It may be provided with a relaxation mode for adjusting the number of revolutions of.

In the above configuration, the target rotation speed of the motor in the relaxation mode is lower than the maximum rotation speed of the motor in the normal mode. Therefore, the rotation speed of the centrifugal fan in the relaxation mode is lower than the rotation speed of the centrifugal fan in the normal mode. As a result, the suction force of the blower in the relaxation mode is smaller than the suction force of the blower in the normal mode. As a result, the suction of pebbles can be suppressed in the relaxation mode as compared with the normal mode. As a result, by setting the control board to the relaxation mode, it is possible to stably suppress the suction of pebbles.

In one or more embodiments, when the control board is in relaxation mode, the trigger push-in amount may be increased to a maximum and the motor speed may be gradually increased to a target speed.

In the above configuration, the flow rate of air sucked into the intake port changes depending on the amount of depression of the trigger. Therefore, the rotation speed of the motor, that is, the flow rate of the air sucked into the intake port can be freely adjusted according to the state of the work area.

In one or more embodiments, when the control board is in relaxation mode, the motor speed may be constant at the target speed, regardless of the amount of trigger push.

In the above configuration, the rotation speed of the centrifugal fan becomes constant regardless of the amount of pushing of the trigger, and the suction force can be made constant. As a result, the operator can easily perform the suction operation by using the blower.

In one or more embodiments, the blower may further include a switch to switch between normal and relaxed modes of the control board.

In the above configuration, the operator can switch between the normal mode and the relaxation mode by a simple operation of pressing a switch.

In one or more embodiments, the switch may be a mains power switch that switches between an on state that allows the motor to be driven and an off state that prohibits the motor from being driven. When the switch is pressed and held, the normal mode and the relaxation mode of the control board may be switched.

In the above configuration, the operator can perform the operation of switching the blower on state and the off state and the operation of switching between the normal mode and the relaxation mode by the main power switch. Therefore, it is not necessary to separately install a changeover switch for switching between the normal mode and the relaxation mode.

In one or more embodiments, the blower may further include a display capable of indicating that the control board is in relaxed mode.

In the above configuration, the operator can easily confirm whether or not the control board is in the relaxation mode by the display displayed on the display unit.

(First Example)
The blower 2 of the first embodiment will be described with reference to FIGS. 1 to 8. The blower 2 is a handheld blower. The blower 2 has a blowing mode and a suction mode. When the blower 2 is used in the ventilation mode, the blower 2 can blow off fallen leaves and the like on the ground. When the blower 2 is used in the suction mode, the blower 2 can suck and collect fallen leaves and the like on the ground. Hereinafter, the direction in which the rotation axis 62a of the motor 62 extends is referred to as a left-right direction, a direction orthogonal to the left-right direction is referred to as a front-rear direction, and a direction orthogonal to the left-right direction and the front-back direction is referred to as a vertical direction.

1 to 6 show the configuration of the blower 2 when used in the ventilation mode. The blower 2 includes a casing 4, a plurality of batteries B (two in this embodiment), a main power switch 42, a display unit 44, a trigger 24, a cruise valve 26, and a sensor 32 (see FIG. 2). And have. The casing 4 includes a main casing 6, a side casing 8, a front connecting portion 10, a rear connecting portion 12, a main grip 14, and a leg member 16. The main casing 6 is formed as a volute casing. The side casing 8 is fixed to the left side surface of the main casing 6 with screws. A plurality of intake ports 20 are formed on the front surface of the side casing 8. The intake port 20 penetrates the side casing 8 in the thickness direction.

The front connecting portion 10 extends upward from the front upper portion of the main casing 6. The rear connecting portion 12 extends upward from the rear upper portion of the main casing 6. The main grip 14 extends between the rear upper portion of the front connecting portion 10 and the front upper portion of the rear connecting portion 12. That is, the front end portion of the main grip 14 is connected to the rear upper portion of the front connecting portion 10, and the rear end portion of the main grip 14 is connected to the front upper portion of the rear connecting portion 12. The main grip 14 is arranged above the main casing 6. The main grip 14 is gripped by an operator. The main grip 14 has a conductive material. The conductive material is, for example, a conductive elastomer. The leg member 16 is fixed to the lower part of the main casing 6. With the blower 2 placed on the ground, only the leg member 16 comes into contact with the ground. The leg member 16 includes a subgrip 18. The subgrip 18 separates from the ground when the blower 2 is placed on the ground. As a result, when lifting the blower 2 mounted on the mounting surface, the operator can grip the main grip 14 with one hand and the sub grip 18 with the other hand.

Two batteries B are detachably attached to the front surface of the main casing 6. The two batteries B are electrically connected in series. In the modified example, the two batteries B may be electrically connected in parallel. The battery B is, for example, a lithium ion battery.

The main power switch 42 and the display unit 44 are arranged on the inner surface 40 formed by the side casing 8 and the main casing 6. The middle surface 40 faces upward. The inner surface 40 is arranged on the lower left side of the main grip 14. The main power switch 42 is operated by an operator with a hand opposite to the hand holding the main grip 14. As a result, it is possible to prevent the main power switch 42 from being erroneously operated by the hand holding the main grip 14. The main power switch 42 is a switch that switches between an on state and an off state of the blower 2. When the blower 2 is in the off state, the driving of the motor 62, which will be described later, is prohibited. As a result, the motor 62 is not driven even if the trigger 24 is pushed in. On the other hand, when the blower 2 is in the ON state, the driving of the motor 62 is allowed. As a result, when the trigger 24 is pushed in, the motor 62 is driven. The state of the blower 2 is displayed on the display unit 44. In this embodiment, the display unit 44 includes two display windows 44a and 44b. When the blower 2 is in the ON state, the display window 44a displays to that effect. When the control board 66 described later is in the relaxation mode M2, the display window 44b displays to that effect. The display unit 44 is, for example, an LED panel. In the modified example, the display unit 44 may have a configuration in which light is turned on.

The trigger 24 and the cruise valve 26 are rotatably attached to the main grip 14. As shown in FIG. 2, the trigger 24 includes a trigger operation unit 28 and a push unit 30. The trigger operation portion 28 and the push portion 30 are integrally formed. The trigger operation unit 28 is a portion that is pushed in by an operator. The trigger operation unit 28 rotates about a rotation axis extending in the left-right direction. The push unit 30 pushes the switch 32a of the sensor 32 by the rotation of the trigger operation unit 28. When the blower 2 is in the ON state, when the switch 32a of the sensor 32 is pressed, the motor 62 described later is driven. The amount of pushing of the switch 32a of the sensor 32 by the pushing part 30 changes according to the amount of pushing of the trigger operation unit 28.

The cruise valve 26 includes a valve operating portion 34, an intermediate portion 36, and a stopper 38. The valve operating unit 34 is arranged outside the main grip 14 (see FIG. 1). The valve operating unit 34 is operated by an operator. The valve operating unit 34 rotates about a rotation shaft extending in the left-right direction. The valve operating unit 34 can be fixed at a desired rotation position. The intermediate portion 36 is connected to the valve operating portion 34. Although not shown, the intermediate portion 36 is arranged inside the main grip 14. The intermediate portion 36 rotates integrally with the valve operating portion 34. The stopper 38 extends from the outer peripheral edge of the intermediate portion 36 toward the right. The stopper 38 can come into contact with the pushing portion 30 of the trigger 24. When the valve operating portion 34 is rotated forward, the stopper 38 rotates and comes into contact with the pushing portion 30. From this state, when the valve operating portion 34 further rotates forward, the stopper 38 rotates forward together with the pushing portion 30. When the valve operating portion 34 is fixed at a desired rotation position, the stopper 38 is fixed. The stopper 38 suppresses the push portion 30 from moving backward. As a result, the pushing amount of the switch 32a of the sensor 32 does not fall below a predetermined value.

As shown in FIG. 3, the casing 4 has a fan accommodating chamber 50, a motor accommodating chamber 52, an intake port 54, an air flow path 56, and a discharge port 58 (see FIG. 5). The fan accommodating chamber 50 is defined inside the main casing 6. The motor accommodating chamber 52 is defined by a main casing 6 and a side casing 8. The motor accommodating chamber 52 is arranged on the left side of the fan accommodating chamber 50. The fan accommodating chamber 50 and the motor accommodating chamber 52 communicate with each other through an opening 59 formed on the left side surface of the main casing 6. The intake port 54 is arranged on the right side surface of the main casing 6. The intake port 54 penetrates the right side surface of the main casing 6. The intake port 54 communicates with the fan accommodating chamber 50. The air flow path 56 communicates with the fan accommodating chamber 50. As shown in FIG. 5, the air flow path 56 extends spirally around an axis extending in the left-right direction. When the blower 2 is viewed to the right, the air flow path 56 extends counterclockwise from the inside to the outside. The discharge port 58 communicates with the air flow path 56. The discharge port 58 is arranged in the upper part of the front surface of the main casing 6.

As shown in FIG. 3, the blower 2 further includes a cover 60, a motor 62, a motor housing 64, a control board 66, a metal plate 67, a centrifugal fan 70, a cooling fan 72, and a blade 74. I have. The cover 60 is arranged on the right side surface of the main casing 6. The cover 60 is rotatable with respect to the main casing 6 about a rotation shaft extending in the vertical direction. The cover 60 covers the intake port 54. A large number of small openings are formed in the cover 60.

The motor housing 64, the motor 62, and the control board 66 are arranged in the motor accommodating chamber 52. The motor housing 64 is fixed to the left side surface of the main casing 6 by screws. The motor housing 64 covers the opening 59 of the main casing 6. The motor housing 64 has a motor intake port 78 and a motor discharge port 79. The motor intake port 78 is arranged on the left side surface 64a of the motor housing 64. The motor intake port 78 penetrates the left side surface 64a of the motor housing 64. The motor discharge port 79 is arranged on the right side surface 64b of the motor housing 64. The motor discharge port 79 penetrates the right side surface 64b of the motor housing 64. The right side surface 64b of the motor housing 64 faces the left side surface of the main casing 6.

The motor 62 is arranged inside the motor housing 64. The motor 62 is, for example, a brushless motor. In the modified example, the motor 62 may be a brushed motor. The rotating shaft 62a of the motor 62 is rotated by the electric power of the battery B. The rotation shaft 62a of the motor 62 extends in the left-right direction. The rotating shaft 62a is inserted through the opening 59 of the main casing 6. The left end of the rotating shaft 62a is arranged in the motor accommodating chamber 52, and the right end of the rotating shaft 62a is arranged in the fan accommodating chamber 50.

The control board 66 is arranged at a position close to the battery B. The control board 66 is electrically connected to the motor 62 and the sensor 32. The control board 66 drives the motor 62 when the switch 32a of the sensor 32 is pressed by the pushing operation of the trigger 24. The control board 66 adjusts the rotation speed of the motor 62 according to the pushing amount of the switch 32a.

As shown in FIG. 4, the metal plate 67 is arranged between the left side surface of the main casing 6 and the control board 66. In FIG. 4, the peripheral edge of the enlarged portion is surrounded by a square in order to make the drawing easier to see. The metal plate 67 is connected to the main grip 14 via wiring (not shown).

As shown in FIG. 3, the centrifugal fan 70, the cooling fan 72, and the blade 74 are arranged in the fan accommodating chamber 50. The centrifugal fan 70 is made of a resin material. The centrifugal fan 70 is fitted in the vicinity of the right end portion of the rotating shaft 62a of the motor 62. The cooling fan 72 is made of a resin material. In the left-right direction, the cooling fan 72 is arranged between the centrifugal fan 70 and the opening 59 of the main casing 6. The cooling fan 72 is arranged on the back surface of the centrifugal fan 70. The back surface of the centrifugal fan 70 faces the left side surface of the main casing 6. The blade 74 is fitted to the right end of the rotating shaft 62a of the motor 62.

As shown in FIG. 6, the blower 2 further includes heat radiation fins 68. The heat radiating fins 68 are arranged on the control board 66. The heat radiation fin 68 includes a plurality of fins. The plurality of fins are arranged with a gap from each other. The heat radiation fins 68 extend in the left-right direction.

The main casing 6 further has a communication hole 84. The communication hole 84 has an elongated shape. Looking at the blower 2 to the right, the communication hole 84 overlaps with the heat radiation fin 68. As shown in FIG. 3, the communication hole 84 penetrates the left side surface of the main casing 6. The communication hole 84 communicates the fan accommodating chamber 50 and the motor accommodating chamber 52. The communication hole 84 is arranged apart from the opening 59 of the main casing 6 on the radial outer side of the rotating shaft 62a. The communication hole 84 is arranged radially inside the rotating shaft 62a with respect to the peripheral edge of the centrifugal fan 70. In the left-right direction, the communication hole 84 is arranged so as to overlap the centrifugal fan 70. The communication hole 84 is arranged in the vicinity of the control board 66 and the heat radiation fin 68. The control board 66 is arranged on a virtual line connecting the communication hole 84 and the motor intake port 78 of the motor housing 64.

As shown in FIG. 5, the blower 2 further includes a fixed nozzle 80 and a blower nozzle 82. The fixed nozzle 80 is inserted through the discharge port 58. The fixed nozzle 80 is a cylinder extending in the longitudinal direction. Air that has passed through the discharge port 58 flows through the fixed nozzle 80.

The blower nozzle 82 is removably attached to the tip of the fixed nozzle 80. The blower nozzle 82 is a long nozzle. The blower nozzle 82 is, for example, a nozzle for rain gutters. The gutter nozzle is used to blow off the fallen leaves and the like accumulated in the gutter attached to the building. The blower nozzle 82 has a length of, for example, 2 m or more. The blower nozzle 82 extends in the longitudinal direction and then curves and extends in the vicinity of the tip portion thereof.

Next, the blowing operation of the blower 2 when used in the blowing mode will be described. When the blower 2 is used in the blow mode, the main grip 14 is gripped by the operator. When the trigger 24 is pushed by the operator and the motor 62 rotates, the centrifugal fan 70, the cooling fan 72, and the blade 74 rotate around the rotation shaft 62a. As a result, air flows from the intake port 54 to the left and flows into the fan accommodating chamber 50. The air that has flowed into the fan accommodating chamber 50 is sent out by the centrifugal fan 70 toward the outside in the radial direction of the rotating shaft 62a. The air is guided to the main casing 6, passes through the air flow path 56, and is discharged from the discharge port 58 to the outside of the main casing 6. After that, the air passes through the fixed nozzle 80 and the blower nozzle 82, and blows out from the tip opening of the blower nozzle 82. As a result, for example, when the tip opening of the blower nozzle 82 faces the gutter, the fallen leaves accumulated in the gutter are blown away. Further, when the valve operating portion 34 of the cruise valve 26 is rotated forward and fixed at a predetermined position by the operation of the cruise valve 26 by the operator, the switch 32a of the sensor 32 is pressed by a predetermined amount. Is maintained at. As a result, even when the operator releases the trigger 24, the fallen leaves accumulated in the rain gutter are blown away.

While the centrifugal fan 70 is rotated by the drive of the motor 62, the pressure of the air flow path 56 and the pressure of the fan accommodating chamber 50 near the communication hole 84 increase. As a result, the pressure in the fan accommodating chamber 50 near the communication hole 84 becomes higher than the pressure in the motor accommodating chamber 52 in the vicinity of the communication hole 84. Therefore, as shown by the arrow Fi in FIG. 3, air passes through the communication hole 84 and flows from the fan accommodating chamber 50 to the motor accommodating chamber 52. Since the pressure near the opening 59 of the fan accommodating chamber 50 becomes negative due to the rotation of the cooling fan 72, the air that has passed through the communication hole 84 flows through the motor accommodating chamber 52 and passes through the opening 59 to accommodate the fan. It flows into room 50. Specifically, first, the air that has passed through the communication hole 84 is guided by the heat radiation fins 68 and flows on the control board 66. While flowing on the control board 66, this air passes through the intake port 20 and flows from the outside of the blower 2 to the motor accommodating chamber 52 (that is, flows in the direction of the arrow Fg shown in FIG. 3). It merges with the air). Next, the air flows toward the motor intake port 78 and is taken into the inside of the motor housing 64, as shown by the arrow Fm in FIG. The air then passes through the motor discharge port 79 and the opening 59 and flows from the motor accommodation chamber 52 to the fan accommodation chamber 50, as shown by the arrow Fo in FIG. After that, at least a part of the air sent out by the cooling fan 72 toward the outside in the radial direction of the rotating shaft 62a passes through the communication hole 84 and flows from the fan accommodating chamber 50 to the motor accommodating chamber 52. As a result, an air circulation flow path is formed between the fan accommodating chamber 50 and the motor accommodating chamber 52 through the communication hole 84 and the opening 59. As a result, the control board 66 arranged in the air circulation flow path is cooled.

The configuration of the blower 2 when used in the suction mode will be described with reference to FIG. 7. Some of the components of the blower 2 when used in the suction mode are different from some of the components of the blower 2 when used in the ventilation mode. As shown in FIG. 7, the blower 2 includes a suction nozzle 92, a joint 94, a flexible nozzle 96, and a dust bag 98 instead of the fixed nozzle 80 and the blow nozzle 82. The suction nozzle 92 is attached to the main casing 6 on the periphery of the intake port 54 (not shown in FIG. 7) with the cover 60 open.

Although not shown, the joint 94 is inserted through the discharge port 58. The flexible nozzle 96 is attached to the tip of the joint 94. The dust bag 98 is attached to the other end of the flexible nozzle 96.

Further, the blower 2 further includes a harness 100. Both ends of the harness 100 are removably attached to the casing 4. The harness 100 is detachably attached to the dust bag 98 at an arbitrary position between both ends.

The suction operation of the blower 2 when used in the suction mode will be described. When the blower 2 is used in suction mode, the main grip 14 and the sub grip 18 are gripped by the operator. In addition, the harness 100 is hung on the operator. When the trigger 24 is pushed by the operator and the motor 62 rotates, the centrifugal fan 70, the cooling fan 72, and the blade 74 rotate around the rotation shaft 62a. From this state, when the tip opening of the suction nozzle 92 faces the ground, the fallen leaves on the ground come from the suction nozzle 92, the intake port 54, the fan accommodating chamber 50, the air flow path 56, the discharge port 58, the joint 94, and the flexible nozzle 96. Is collected in the dust bag 98 in order. The fallen leaves are crushed by the blade 74. Even in the blower 2 when used in the ventilation mode, an air circulation flow path is formed between the fan accommodating chamber 50 and the motor accommodating chamber 52 through the communication hole 84 and the opening 59 as described above.

In this embodiment, as shown in FIG. 8, the control board 66 can execute the normal mode M1 and the relaxation mode M2. The normal mode M1 is a mode set when the main power switch 42 is pressed by the operator and the blower 2 is switched from the off state to the on state. When the main power switch 42 is pressed and held for a predetermined number of seconds or longer while the control board 66 is in the normal mode M1, the control board 66 switches from the normal mode M1 to the relaxation mode M2. At this time, the display window 44b (see FIG. 1) of the display unit 44 lights up. Further, when the main power switch 42 is pressed and held for a predetermined number of seconds or longer while the control board 66 is in the relaxation mode M2, the control board 66 switches from the relaxation mode M2 to the normal mode M1. At this time, the display window 44b of the display unit 44 is turned off. The predetermined number of seconds is, for example, 1 second or more, and in this embodiment, it is 2 seconds.

The normal mode M1 is mainly used when the blower 2 is used in the blow mode. As shown in FIG. 8, when the control board 66 is in the normal mode M1, when the trigger 24 is not pushed, that is, when the pushing amount of the trigger 24 is 0%, the pushing amount of the switch 32a of the sensor 32 is 0. %, And the rotation speed of the motor 62 is zero. The pushing amount of the trigger 24 increases from 0% to the maximum 100%, that is, the pushing amount of the switch 32a of the sensor 32 increases from 0% to 100%, and the rotation speed of the motor 62 reaches the maximum rotation speed R1. Gradually increase. As a result, when the blower 2 is used in the blower mode, the higher the pushing amount of the trigger 24, the higher the flow rate of the air blown out from the tip opening of the blower nozzle 82.

The relaxation mode M2 is mainly used when the blower 2 is used in the suction mode. When the control board 66 is in the relaxation mode M2, when the trigger 24 is not pushed, that is, when the pushing amount of the trigger 24 is 0%, the pushing amount of the switch 32a of the sensor 32 is 0%, and the pushing amount of the motor 62 The number of revolutions is zero. The pushing amount of the trigger 24 increases from 0% to the maximum 100%, that is, the pushing amount of the switch 32a of the sensor 32 increases from 0% to 100%, and the rotation speed of the motor 62 reaches the target rotation speed R2. Gradually increase. As a result, when the blower 2 is used in the suction mode, the larger the pushing amount of the trigger 24, the higher the flow rate of the air sucked into the tip opening of the suction nozzle 92. Therefore, the larger the pushing amount of the trigger 24, the higher the force for sucking the attracted material. The target rotation speed R2 is, for example, 70% or less of the maximum rotation speed R1 in the normal mode M1. In the modified example, the target rotation speed R2 is, for example, 50% or less of the maximum rotation speed R1.

In the relaxation mode M2, when the motor 62 is rotating at the target rotation speed R2, the blower 2 sucks a relatively light suction material such as fallen leaves (for example, a suction material of 5 g or less), while relatively a small stone or the like. Do not suck heavy suction material (for example, suction material of 5 g or more). In the relaxation mode M2, when the motor 62 is rotating at the target rotation speed R2, the suction power of the blower 2 is 50 to 100 W. Here, the suction power is a numerical value calculated by multiplying the suction air amount, the suction pressure, and a predetermined coefficient.

In this embodiment, the blower 2 includes a casing 4, a motor 62, a centrifugal fan 70, and a control board 66. The casing 4 has a motor accommodating chamber 52 and a fan accommodating chamber 50 that communicate with each other through the opening 59. As shown in FIG. 3, the motor 62 is arranged in the motor accommodating chamber 52, and the rotating shaft 62a is inserted through the opening 59. The centrifugal fan 70 is arranged in the fan accommodating chamber 50, and is driven by the motor 62 to rotate around the rotating shaft 62a. The control board 66 is arranged in the motor accommodating chamber 52 and controls the drive of the motor 62. The casing 4 communicates the motor accommodating chamber 52 and the fan accommodating chamber 50, and further has a communication hole 84 arranged away from the opening 59. In this configuration, when the pressure in the fan accommodating chamber 50 is higher than the pressure in the motor accommodating chamber 52, air passes through the communication hole 84, flows from the fan accommodating chamber 50 to the motor accommodating chamber 52, and passes through the opening 59. Then, it flows from the motor accommodating chamber 52 to the fan accommodating chamber 50. Therefore, even when the pressure of the fan accommodating chamber 50 becomes higher than the pressure of the motor accommodating chamber 52, air flows through the motor accommodating chamber 52, and the control board 66 is sufficiently cooled by the air. As a result, it is possible to prevent the control board 66 from becoming hot.

Further, as shown in FIG. 3, the communication hole 84 is arranged so as to overlap the centrifugal fan 70 in the direction of the rotation shaft 62a. In this configuration, the centrifugal fan 70 sends air outward in the radial direction. Therefore, by arranging the communication hole 84 so as to overlap the centrifugal fan 70 with respect to the direction of the rotation shaft 62a, the air sent out by the centrifugal fan 70 passes through the communication hole 84 and passes from the fan storage chamber 50 to the motor storage chamber. It is possible to suppress the flow to 52. As a result, it is possible to suppress a decrease in the blowout flow rate of the blower 2.

Further, the blower 2 further includes a battery B for supplying electric power to the motor 62. In this configuration, the blower 2 can be used even in a work area where there is no external power supply.

Further, the battery B is arranged close to the control board 66. In this configuration, the length of the wiring connecting the battery B and the control board 66 can be shortened. As a result, the wiring can be easily routed.

The blower 2 is arranged in the motor accommodating chamber 52, and further includes heat radiation fins 68 for guiding the air flowing through the motor accommodating chamber 52. The heat radiating fins 68 are arranged on the control board 66. In this configuration, air is guided by the radiating fins 68 and flows on the control board 66. As a result, the control board 66 can be efficiently cooled. As a result, it is possible to prevent the control board 66 from becoming hot.

Further, as shown in FIG. 3, the blower 2 further includes a cooling fan 72 arranged between the opening 59 and the centrifugal fan 70 in the direction of the rotation shaft 62a. The cooling fan 72 rotates together with the centrifugal fan 70. In this configuration, when the cooling fan 72 rotates, the pressure in the space in the vicinity of the cooling fan 72 decreases. As a result, air can be efficiently flowed from the motor accommodating chamber 52 to the fan accommodating chamber 50 through the opening 59. Therefore, the flow rate of the air flowing through the motor accommodating chamber 52 increases, and the control board 66 is efficiently cooled. As a result, it is possible to prevent the control board 66 from becoming hot.

Further, as shown in FIG. 5, the casing 4 has a discharge port 58 for discharging the air sent out by the centrifugal fan 70 to the outside of the casing 4. The blower 2 further includes a blower nozzle 82 through which air discharged from the discharge port 58 flows. The blower nozzle 82 is a long nozzle. Generally, when a long nozzle is used as the blower nozzle, the pressure in the fan accommodating chamber 50 increases while the centrifugal fan 70 is rotating. Therefore, in the configuration in which the blower 2 does not have the communication hole 84, when the pressure of the fan accommodating chamber 50 becomes higher than the pressure of the motor accommodating chamber 52, the blower 2 passes through the opening 59 and passes from the motor accommodating chamber 52 to the fan accommodating chamber 50. Air may be difficult to flow. As a result, the control board 66 may not be sufficiently cooled and may become hot. In the above configuration, since the communication hole 84 communicates the motor accommodating chamber 52 and the fan accommodating chamber 50, sufficient air flows through the motor accommodating chamber 52 even when a long nozzle is used as the blow nozzle 82. , The control board 66 is sufficiently cooled. Therefore, it is possible to prevent the control board 66 from becoming hot.

Further, as shown in FIG. 3, the control board 66 is arranged in the air flow path in which the motor accommodating chamber 52 flows from the communication hole 84 toward the motor 62. In this configuration, air flows over the control board 66. As a result, the control board 66 can be efficiently cooled. As a result, it is possible to prevent the control board 66 from becoming hot.

Further, as shown in FIG. 3, the blower 2 further includes a motor housing 64 for accommodating the motor 62. The motor housing 64 has a motor intake port 78 that takes in air inside the motor housing 64. The control board 66 is arranged on a virtual line connecting the communication hole 84 and the motor intake port 78. In this configuration, the control board 66 is arranged on the shortest distance between the communication hole 84 and the motor intake port 78. Therefore, the control board 66 can be efficiently cooled. As a result, it is possible to prevent the control board 66 from becoming hot.

In this embodiment, the blower 2 includes a motor 62, a centrifugal fan 70, a casing 4, a trigger 24, and a control board 66. The centrifugal fan 70 rotates about the rotation shaft 62a by the rotation of the motor 62. The casing 4 houses the motor 62 and the centrifugal fan 70, and guides air from the intake port 54 to the discharge port 58 as the centrifugal fan 70 rotates. The trigger 24 is pushed by the operator. The control board 66 controls the drive of the motor 62. As shown in FIG. 8, the control board 66 has a normal mode M1 in which the rotation speed of the motor 62 is adjusted according to a pushing amount of the trigger 24, and a case where the pushing amount of the trigger 24 in the normal mode M1 is the maximum amount. A relaxation mode M2 for adjusting the rotation speed of the motor 62 to a target rotation speed R2 lower than the maximum rotation speed R1 of the motor 62 is provided. In this configuration, the target rotation speed R2 of the motor 62 in the relaxation mode M2 is lower than the maximum rotation speed R1 of the motor 62 in the normal mode M1. Therefore, the rotation speed of the centrifugal fan 70 in the relaxation mode M2 is lower than the rotation speed of the centrifugal fan 70 in the normal mode M1. As a result, the suction force of the blower 2 in the relaxation mode M2 is smaller than the suction force of the blower 2 in the normal mode M1. As a result, in the relaxation mode M2, the suction of pebbles can be suppressed as compared with the normal mode M1. As a result, by setting the control board 66 to the relaxation mode M2, the suction of pebbles can be stably suppressed.

Further, as shown in FIG. 8, when the control board 66 is in the relaxation mode M2, the pushing amount of the trigger 24 increases to the maximum amount, and the rotation speed of the motor 62 gradually increases to the target rotation speed R2. In this configuration, the flow rate of the air sucked into the intake port 54 changes depending on the amount of pushing down of the trigger 24. Therefore, the rotation speed of the motor 62, that is, the flow rate of the air sucked into the intake port 54 can be freely adjusted according to the state of the work area.

Further, the blower 2 further includes a switch 42 for switching between the normal mode M1 and the relaxation mode M2 of the control board 66. In this configuration, the operator can switch between the normal mode M1 and the relaxation mode M2 by a simple operation of pressing the main power switch 42.

Further, the switch 42 is a main power switch 42 that switches between an on state that allows the motor 62 to be driven and an off state that prohibits the motor 62 from being driven. When the main power switch 42 is pressed and held for a long time, the normal mode M1 and the relaxation mode M2 of the control board 66 are switched. In this configuration, the operator can use the main power switch 42 to switch between the on state and the off state of the blower 2 and to switch between the normal mode M1 and the relaxation mode M2. Therefore, it is not necessary to separately install a changeover switch for switching between the normal mode M1 and the relaxation mode M2.

Further, the blower 2 further includes a display unit 44 capable of displaying that the control board 66 is in the relaxation mode M2. In this configuration, the operator can easily confirm whether or not the control board 66 is in the relaxation mode M2 by the display displayed on the display unit 44.

Further, as shown in FIG. 4, the metal plate 67 is arranged between the left side surface of the main casing 6 and the control board 66. The metal plate 67 is connected to the main grip 14 via wiring (not shown). In the blower 2, when the centrifugal fan 70 rotates, static electricity accumulates in the main casing 6. Therefore, for example, when a metal material such as a metal plate 67 is not arranged between the left side surface of the main casing 6 and the control board 66, the control board 66 may malfunction due to the static electricity accumulated in the main casing 6. is there. In the above configuration, the static electricity accumulated in the main casing 6 moves from the metal plate 67 to the ground via the wiring, the main grip 14, and the body of the operator who grips the main grip 14. As a result, it is possible to prevent the control board 66 from malfunctioning due to the influence of static electricity.

(Correspondence)
The motor accommodation chamber 52 is an example of the "first accommodation chamber", and the fan accommodation chamber 50 is an example of the "second accommodation chamber".

(Second Example)
A second embodiment will be described with reference to FIG. In the second embodiment, the points different from those in the first embodiment will be described, and the same points as in the first embodiment will be omitted. In the second embodiment, the relaxation mode M3 executed by the control board 66 is different from the relaxation mode M2 of the first embodiment. As shown in FIG. 9, when the control board 66 is in the relaxation mode M3, the rotation speed of the motor 62 is constant at the target rotation speed R3 regardless of the pushing amount of the trigger 24. Further, even when the trigger 24 is not pushed in, the rotation speed of the motor 62 is constant at the target rotation speed R3. Therefore, when the control board 66 is in the relaxation mode M3, the rotation speed of the centrifugal fan 70 is constant regardless of the pushing amount of the trigger 24. The target rotation speed R3 is, for example, 70% or less of the maximum rotation speed R1 in the normal mode M1. In the modified example, the target rotation speed R3 is, for example, 50% or less of the maximum rotation speed R1.

In this embodiment, as shown in FIG. 9, when the control board 66 is in the relaxation mode M3, the rotation speed of the motor 62 is constant at the target rotation speed R3 regardless of the pushing amount of the trigger 24. In this configuration, the rotation speed of the centrifugal fan 70 is constant regardless of the pushing amount of the trigger 24, and the suction force can be constant. As a result, the operator can easily perform the suction operation by using the blower 2.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above.

The communication hole 84 according to the embodiment may be arranged radially outside the rotating shaft 62a with respect to the centrifugal fan 70.

The blower 2 according to the embodiment does not have to include the heat radiation fins 68.

The blower 2 according to the embodiment may be electrically connected to an external power source via a cord.

The cooling fan 72 according to the embodiment may be arranged in the motor accommodating chamber 52.

In addition to the main power switch 42, the blower 2 according to the embodiment may include a changeover switch for switching the control board 66 between the normal mode M1 and the relaxation mode M2. The changeover switch may be a button type or a dial type.

In the blower 2 according to the embodiment, when the control board 66 is in the relaxation mode M3, the rotation speed of the motor 62 may be zero when the trigger 24 is not pushed.

The technical elements described herein or in the drawings exhibit their technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in the present specification or drawings can achieve a plurality of purposes at the same time, and achieving one of the purposes itself has technical usefulness.

2: Blower 4: Casing 6: Main casing 8: Side casing 20: Intake port 24: Trigger 26: Cruise valve 42: Main power switch 44: Display 50: Fan accommodation chamber (second accommodation chamber)
52: Motor accommodation room (first accommodation room)
54: Intake port 58: Discharge port 59: Opening 62: Motor 62a: Rotating shaft 64: Motor housing 66: Control board 67: Metal plate 68: Heat dissipation fin 70: Centrifugal fan 72: Cooling fan 78: Motor intake port 79: Motor Discharge port 82: Blower nozzle 84: Communication hole 92: Suction nozzle B: Battery

Claims (9)

A casing having a first storage chamber and a second storage chamber that communicate with each other through an opening,
A motor arranged in the first accommodation chamber and having a rotating shaft inserted through the opening,
A centrifugal fan arranged in the second storage chamber and rotating around the rotation axis by driving the motor, and a centrifugal fan.
It is arranged in the first accommodation chamber and includes a control board for controlling the drive of the motor.
The casing communicates the first storage chamber with the second storage chamber, and further has a communication hole arranged away from the opening. The blower according to claim 1, wherein the communication holes are arranged so as to overlap with the centrifugal fan in the direction of the rotation axis. The blower according to claim 1 or 2, further comprising a battery that supplies power to the motor. The blower according to claim 3, wherein the battery is arranged close to the control board. It is arranged in the first containment chamber and is further provided with heat radiation fins for guiding the air flowing through the first containment chamber.
The blower according to any one of claims 1 to 4, wherein the heat radiation fin is arranged on the control board. Further, a cooling fan arranged between the opening and the centrifugal fan in the direction of the rotation axis is provided.
The blower according to any one of claims 1 to 5, wherein the cooling fan rotates together with the centrifugal fan. The casing has a discharge port for discharging the air sent out by the centrifugal fan to the outside of the casing.
The blower further includes a blower nozzle through which air discharged from the discharge port flows.
The blower according to any one of claims 1 to 6, wherein the blower nozzle is a long nozzle. The blower according to any one of claims 1 to 7, wherein the control board is arranged in a flow path of air flowing from the communication hole toward the motor in the first accommodating chamber. It further comprises a motor housing for accommodating the motor.
The motor housing has a motor intake port for intake air inside the motor housing.
The blower according to any one of claims 1 to 8, wherein the control board is arranged on a virtual line connecting the communication hole and the motor intake port.

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