JP7348816B2 - blower - Google Patents

Description

The technology disclosed herein relates to a blower.

Patent Document 1 discloses a blower. The blower includes a casing, a motor, a centrifugal fan, and a control board. The casing has therein a first storage chamber and a second storage chamber that communicate with each other through an opening. The motor is arranged in the first storage chamber, and the rotating shaft is inserted through the opening. The centrifugal fan is disposed in the second storage chamber and rotates about the rotation shaft by driving the motor. The control board is disposed in the first storage chamber and controls 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 into the first storage chamber, passes through the opening, and flows into the second storage chamber. The control board is cooled by the air flowing through the first storage chamber.

Japanese Patent Application Publication No. 2014-148951

In the above blower, when the pressure in the second storage chamber becomes higher than the pressure in the first storage chamber, it becomes difficult for air to flow from the first storage chamber to the second storage chamber, and it becomes difficult for air to flow from the outside to the first storage chamber. Become. As a result, it becomes difficult for air to flow inside the first storage chamber. For this reason, the control board may not be sufficiently cooled, and the control board may become hot. This specification discloses a technique that can suppress a control board from becoming high temperature.

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

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

FIG. 2 is a perspective view of the blower 2 in the ventilation mode of the first embodiment. FIG. 3 is a perspective view of the trigger 24, cruise valve 26, and sensor 32 of the blower 2 of the first embodiment. FIG. 2 is a horizontal cross-sectional view of the blower 2 in the ventilation mode of the first embodiment. 4 is an enlarged view of the vicinity of the communication hole 84 in FIG. 3. FIG. FIG. 2 is a cross-sectional view of the blower 2 in the ventilation mode of the first embodiment. It is a left side view when the side casing 8 of the blower 2 is removed in the ventilation mode of the first embodiment. FIG. 2 is a perspective view of the blower 2 in the suction mode of the first embodiment. It is a graph showing the relationship between the amount of trigger depression and the motor rotation speed in the normal mode and relaxation mode executed by the control board 66 of the blower 2 of the first embodiment. It is a graph showing the relationship between the amount of trigger depression and the motor rotation speed in the normal mode and relaxation mode executed by the control board 66 of the blower 2 of the second embodiment.

In one or more embodiments, a blower may include a casing, a motor, a centrifugal fan, and a control board. The casing may have therein a first storage chamber and a second storage chamber that communicate with each other through an opening. The motor may be disposed in the first storage chamber, and the rotating shaft may be inserted through the opening. The centrifugal fan is disposed in the second storage chamber, and may be rotated about a rotating shaft by driving a motor. The control board is disposed in the first storage chamber and may control driving of the motor. The casing may further include a communication hole that communicates the first storage chamber and the second storage chamber and is located apart from the opening.

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

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

In the above configuration, the centrifugal fan sends air radially outward. Therefore, by arranging the communication hole so as to overlap the centrifugal fan in the direction of the rotation axis, the air sent out by the centrifugal fan is prevented from passing through the communication hole and flowing from the second storage chamber to the first storage chamber. can do. Thereby, a decrease in the blowing flow rate of the blower can be suppressed.

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 work areas where no external power source is present.

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

With the above configuration, the length of the wiring connecting the battery and the control board can be shortened. This allows for better wiring.

In one or more embodiments, the blower may further include radiation fins that are disposed in the first storage chamber and guide air flowing through the first storage chamber. The radiation fins may be arranged on the control board.

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

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

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

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

Generally, when a long nozzle is used as a blowing nozzle, the pressure in the second storage chamber increases while the centrifugal fan is rotating. Therefore, in a configuration where the blower does not have a communication hole, if the pressure in the second storage chamber becomes higher than the pressure in the first storage chamber, air will pass through the opening and flow from the first storage chamber to the second storage chamber. It may become difficult to flow. As a result, the control board may not be sufficiently cooled and may reach a high temperature. In the above configuration, since the communication hole communicates the first storage chamber and the second storage chamber, even when a long nozzle is used as the ventilation nozzle, sufficient air can flow through the first storage chamber and control The substrate is sufficiently cooled. Therefore, it is possible to prevent the control board from becoming high temperature.

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

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

In one or more embodiments, the blower may further include a motor housing housing the motor. The motor housing may have a motor intake port that takes air into the motor housing. The control board may be arranged on an imaginary line connecting the communication hole and the motor intake port.

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

In one or more embodiments, a blower may include a motor, a centrifugal fan, a casing, a trigger, and a control board. The centrifugal fan may rotate around a rotating shaft due to rotation of a motor. The casing accommodates a motor and a centrifugal fan, and may guide air from the intake port to the discharge port as the centrifugal fan rotates. The trigger may be depressed by the operator. The control board may control driving of the motor. The control board operates in two modes: normal mode, which adjusts the motor rotation speed according to the amount of trigger depression; and a relaxation mode for adjusting the number of rotations.

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. Thereby, in the relaxation mode, suction of pebbles can be suppressed more than in 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 the relaxation mode, the amount of trigger depression may be increased to a maximum amount and the number of revolutions of the motor may be gradually increased to the target number of revolutions.

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

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

In the above configuration, the rotational speed of the centrifugal fan is constant regardless of the amount of push of the trigger, and the suction force can be constant. This allows the operator to easily perform suction work using the blower.

In one or more embodiments, the blower may further include a switch for switching the control board between a normal mode and a relaxed mode.

With the above configuration, the operator can switch between the normal mode and the relaxation mode by simply pressing a switch.

In one or more embodiments, the switch may be a main power switch that toggles between an on state that allows the motor to drive and an off state that prohibits the motor from running. If the switch is pressed for a long time, the control board may switch between a normal mode and a relaxation mode.

In the above configuration, the operator can switch the blower between an on state and an off state, and between a normal mode and a relaxation mode, using the main power switch. Therefore, there is no need 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 an indicator capable of indicating that the control board is in a mitigation mode.

With the above configuration, the operator can easily check whether the control board is in the relaxation mode by the display displayed on the display unit.

(First example)
A blower 2 according to a first embodiment will be described with reference to FIGS. 1 to 8. Blower 2 is a hand-held blower. The blower 2 has an air blowing mode and a suction mode. When the blower 2 is used in the ventilation mode, the blower 2 can blow away fallen leaves and the like on the ground. When the blower 2 is used in suction mode, the blower 2 can suck and collect fallen leaves and the like on the ground. Hereinafter, the direction in which the rotating shaft 62a of the motor 62 extends will be referred to as the left-right direction, the direction orthogonal to the left-right direction will be referred to as the front-rear direction, and the direction orthogonal to the left-right direction and the front-rear direction will be referred to as the up-down direction.

1 to 6 illustrate the configuration of the blower 2 when used in the blowing mode. The blower 2 includes a casing 4, a plurality of batteries B (two in this embodiment), a main power switch 42, a display section 44, a trigger 24, a cruise valve 26, and a sensor 32 (see FIG. 2). It is equipped with. The casing 4 includes a main casing 6 , a side casing 8 , a front connection part 10 , a rear connection part 12 , a main grip 14 , and leg members 16 . The main casing 6 is designed 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 connection part 10 extends upward from the front upper part 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 part of the front connecting part 10 and the front upper part of the rear connecting part 12. That is, the front end of the main grip 14 is connected to the rear upper part of the front connecting part 10, and the rear end of the main grip 14 is connected to the front upper part of the rear connecting part 12. The main grip 14 is arranged above the main casing 6. The main grip 14 is held by an operator. The main grip 14 includes an electrically 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. When the blower 2 is placed on the ground, only the leg members 16 are in contact with the ground. The leg member 16 includes a sub-grip 18. The sub-grip 18 is separated from the ground when the blower 2 is placed on the ground. Thereby, when lifting the blower 2 placed 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 removably attached to the front surface of the main casing 6. The two batteries B are electrically connected in series. Note that in a modification, the two batteries B may be electrically connected in parallel. Battery B is, for example, a lithium ion battery.

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

The trigger 24 and cruise valve 26 are rotatably attached to the main grip 14. As shown in FIG. 2, the trigger 24 includes a trigger operation section 28 and a push section 30. The trigger operation section 28 and the push section 30 are integrally formed. The trigger operation section 28 is a section that is pressed and operated by the operator. The trigger operation section 28 rotates around a rotation axis extending in the left-right direction. The push part 30 pushes the switch 32a of the sensor 32 by rotation of the trigger operation part 28. When the blower 2 is in the on state, when the switch 32a of the sensor 32 is pressed, a motor 62, which will be described later, is driven. The amount by which the switch 32a of the sensor 32 is pressed by the pressing portion 30 changes depending on the amount by which the trigger operation portion 28 is pressed.

The cruise valve 26 includes a valve operating section 34, an intermediate section 36, and a stopper 38. The valve operation section 34 is arranged outside the main grip 14 (see FIG. 1). The valve operating section 34 is operated by an operator. The valve operating section 34 rotates around a rotation axis extending in the left-right direction. The valve operating portion 34 can be fixed at a desired rotational position. The intermediate portion 36 is connected to the valve operating portion 34 . Although not shown, the intermediate portion 36 is disposed inside the main grip 14. The intermediate portion 36 rotates together 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 push portion 30 of the trigger 24 . When the valve operation part 34 is rotated forward, the stopper 38 is rotated and comes into contact with the push part 30. When the valve operation section 34 further rotates forward from this state, the stopper 38 rotates forward together with the push section 30. When the valve operating portion 34 is fixed at a desired rotational position, the stopper 38 is fixed. The stopper 38 suppresses the pushing portion 30 from moving rearward. As a result, the amount of depression of the switch 32a of the sensor 32 does not become less than a predetermined value.

As shown in FIG. 3, the casing 4 includes a fan housing chamber 50, a motor housing chamber 52, an intake port 54, an air flow path 56, and a discharge port 58 (see FIG. 5). The fan housing chamber 50 is defined inside the main casing 6. The motor housing chamber 52 is defined by the main casing 6 and the side casings 8. The motor housing chamber 52 is arranged on the left side of the fan housing chamber 50. The fan housing chamber 50 and the motor housing chamber 52 communicate with each other via an opening 59 formed in the left side surface of the main casing 6. The intake port 54 is arranged on the right side 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 housing chamber 50. The air flow path 56 communicates with the fan housing chamber 50. As shown in FIG. 5, the air flow path 56 spirally extends 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 at the upper 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 blades 74. We are prepared. The cover 60 is arranged on the right side of the main casing 6. The cover 60 is rotatable with respect to the main casing 6 around a rotation axis 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 housing chamber 52. The motor housing 64 is fixed to the left side of the main casing 6 with screws. Motor housing 64 covers opening 59 in 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 64b of the motor housing 64 faces the left side of the main casing 6.

The motor 62 is arranged inside a motor housing 64. The motor 62 is, for example, a brushless motor. Note that in a modified example, the motor 62 may be a brushed motor. Power from battery B rotates the rotating shaft 62a of the motor 62. A rotating shaft 62a of the motor 62 extends in the left-right direction. The rotating shaft 62a is inserted into the opening 59 of the main casing 6. The left end of the rotating shaft 62a is arranged in the motor housing chamber 52, and the right end of the rotating shaft 62a is arranged in the fan housing chamber 50.

Control board 66 is located close to battery B. Control board 66 is electrically connected to motor 62 and sensor 32 . The control board 66 drives the motor 62 when the switch 32a of the sensor 32 is pressed by pressing the trigger 24. The control board 66 adjusts the rotation speed of the motor 62 according to the amount of depression 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. Note that in FIG. 4, the periphery of the enlarged portion is surrounded by a square 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 blades 74 are arranged in the fan housing chamber 50. The centrifugal fan 70 is made of resin material. The centrifugal fan 70 is fitted near the right end of the rotating shaft 62a of the motor 62. The cooling fan 72 is made of resin material. The cooling fan 72 is disposed between the centrifugal fan 70 and the opening 59 of the main casing 6 in the left-right direction. 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 radiation fins 68. The heat radiation fin 68 is arranged on the control board 66. The radiation fin 68 includes a plurality of fins. The plurality of fins are arranged with gaps between them. The radiation fins 68 extend in the left-right direction.

Main casing 6 further has a communication hole 84 . The communication hole 84 has an elongated shape. When the blower 2 is viewed to the right, the communication hole 84 overlaps with the 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 housing chamber 50 and the motor housing chamber 52. The communication hole 84 is arranged further away from the opening 59 of the main casing 6 toward the outer side in the radial direction of the rotating shaft 62a. The communication hole 84 is arranged radially inward of the rotating shaft 62a from the peripheral edge of the centrifugal fan 70. The communication hole 84 is arranged to overlap with the centrifugal fan 70 in the left-right direction. The communication hole 84 is arranged near the control board 66 and the radiation fins 68. The control board 66 is arranged on an imaginary 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 blowing nozzle 82. The fixed nozzle 80 is inserted into the discharge port 58 . 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 blow nozzle 82 is removably attached to the tip of the fixed nozzle 80. The blow nozzle 82 is a long nozzle. The blow nozzle 82 is, for example, a nozzle for a rain gutter. Rain gutter nozzles are used to blow away fallen leaves, etc. that have accumulated in rain gutters attached to buildings. The blow nozzle 82 has a length of, for example, 2 m or more. The blow nozzle 82 extends in the longitudinal direction, and then extends in a curved manner near its tip.

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 ventilation mode, the main grip 14 is held by the operator. When the operator presses the trigger 24 to rotate the motor 62, the centrifugal fan 70, the cooling fan 72, and the blades 74 rotate around the rotating shaft 62a. As a result, air flows leftward from the intake port 54 and flows into the fan housing chamber 50. The air that has entered the fan storage chamber 50 is sent out toward the outside in the radial direction of the rotating shaft 62a by the centrifugal fan 70. The air is guided to the main casing 6, passes through the air flow path 56, and is discharged to the outside of the main casing 6 from the discharge port 58. Thereafter, the air passes through the fixed nozzle 80 and the blower nozzle 82, and is blown out from the opening at the tip of the blower nozzle 82. As a result, for example, when the tip opening of the blower nozzle 82 faces the rain gutter, fallen leaves accumulated in the rain 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 operator's operation of the cruise valve 26, the switch 32a of the sensor 32 is pressed by a predetermined amount. will be maintained. As a result, even when the operator releases the trigger 24, fallen leaves accumulated in the rain gutter are blown away.

While the centrifugal fan 70 is rotating due to the drive of the motor 62, the pressure in the air flow path 56 and the pressure in the fan housing chamber 50 near the communication hole 84 increase. As a result, the pressure in the fan housing chamber 50 near the communication hole 84 becomes higher than the pressure in the motor housing chamber 52 near the communication hole 84. Therefore, air passes through the communication hole 84 and flows from the fan housing chamber 50 to the motor housing chamber 52, as shown by arrow Fi in FIG. Due to the rotation of the cooling fan 72, the pressure near the opening 59 of the fan housing chamber 50 becomes negative pressure, so the air that has passed through the communication hole 84 flows through the motor housing chamber 52, passes through the opening 59, and enters the fan housing. It flows into chamber 50. Specifically, first, the air that has passed through the communication hole 84 is guided by the radiation fins 68 and flows over the control board 66 . Note that while this air is flowing over the control board 66, the air passes through the intake port 20 and flows from the outside of the blower 2 to the motor housing chamber 52 (that is, the air flows in the direction of arrow Fg shown in FIG. 3). air). The air then flows toward the motor intake port 78 and is drawn into the interior of the motor housing 64, as shown as arrow Fm in FIG. Next, the air passes through the motor outlet 79 and the opening 59, and flows from the motor housing chamber 52 to the fan housing chamber 50, as shown by arrow Fo in FIG. Thereafter, at least a portion of the air sent out radially outward of the rotating shaft 62 a by the cooling fan 72 passes through the communication hole 84 and flows from the fan housing chamber 50 to the motor housing chamber 52 . As a result, an air circulation path is formed between the fan housing chamber 50 and the motor housing chamber 52 via the communication hole 84 and the opening 59. As a result, the control board 66 disposed in the air circulation path is cooled.

With reference to FIG. 7, the configuration of the blower 2 when used in the suction mode will be described. 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 blowing nozzle 82. The suction nozzle 92 is attached to the main casing 6 at 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 into the discharge port 58. A flexible nozzle 96 is attached to the tip of the joint 94. A 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. Harness 100 is removably attached to dust bag 98 at any position between the ends.

The suction operation of the blower 2 when used in the suction mode will be explained. When the blower 2 is used in suction mode, the main grip 14 and the sub-grip 18 are held by the operator. Further, the harness 100 is worn over the shoulder of the worker. When the operator presses the trigger 24 to rotate the motor 62, the centrifugal fan 70, the cooling fan 72, and the blades 74 rotate around the rotating shaft 62a. From this state, when the tip opening of the suction nozzle 92 faces the ground, fallen leaves on the ground will be transferred from the suction nozzle 92 to the suction port 54, the fan storage chamber 50, the air flow path 56, the discharge port 58, the joint 94, and the flexible nozzle 96. The dust passes through the dust bag 98 in order and is collected inside the dust bag 98. The fallen leaves are crushed by the blade 74. Even in the blower 2 when used in the ventilation mode, as described above, an air circulation path is formed between the fan housing chamber 50 and the motor housing chamber 52 via the communication hole 84 and the opening 59.

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 that is set when the operator presses the main power switch 42 and the blower 2 is switched from the off state to the on state. When the main power switch 42 is pressed for a predetermined number of seconds or more 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 section 44 lights up. Further, when the main power switch 42 is pressed for a predetermined number of seconds or more 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 section 44 is turned off. Note that the predetermined number of seconds is, for example, one second or more, and is two seconds in this embodiment.

The normal mode M1 is mainly used when the blower 2 is used in the ventilation mode. As shown in FIG. 8, when the control board 66 is in the normal mode M1, when the trigger 24 is not pushed in, 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. As the amount of depression of the trigger 24 increases from 0% to the maximum 100%, that is, the amount of depression of the switch 32a of the sensor 32 increases from 0% to 100%, the rotation speed of the motor 62 increases to the maximum rotation speed R1. Increase gradually. As a result, when the blower 2 is used in the blowing mode, the higher the amount of depression of the trigger 24, the higher the flow rate of air blown out from the tip opening of the blowing 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 depressed, that is, when the amount of depression of the trigger 24 is 0%, the amount of depression of the switch 32a of the sensor 32 is 0%, and the amount of depression of the switch 32a of the sensor 32 is 0%. The rotation speed is zero. As the amount of depression of the trigger 24 increases from 0% to the maximum 100%, that is, the amount of depression of the switch 32a of the sensor 32 increases from 0% to 100%, the rotation speed of the motor 62 reaches the target rotation speed R2. Increase gradually. As a result, when the blower 2 is used in the suction mode, the higher the push amount of the trigger 24, the higher the flow rate of air suctioned into the tip opening of the suction nozzle 92. Therefore, the higher the amount of depression of the trigger 24, the higher the force for sucking the suction object. Note that the target rotation speed R2 is, for example, 70% or less of the maximum rotation speed R1 in the normal mode M1. In a 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 relatively light suction materials such as fallen leaves (for example, suction materials of 5 g or less), and relatively light suction materials such as pebbles. Do not aspirate heavy objects (for example, objects weighing more than 5g). 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 100W. 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 therein a motor housing chamber 52 and a fan housing chamber 50 that communicate with each other through an opening 59. As shown in FIG. 3, the motor 62 is arranged in the motor housing chamber 52, and the rotating shaft 62a is inserted through the opening 59. The centrifugal fan 70 is disposed in the fan storage chamber 50 and rotates around a rotating shaft 62a by driving the motor 62. The control board 66 is arranged in the motor housing chamber 52 and controls the drive of the motor 62. The casing 4 communicates the motor housing chamber 52 and the fan housing chamber 50 , and further includes a communication hole 84 arranged apart from the opening 59 . In this configuration, when the pressure in the fan housing chamber 50 becomes higher than the pressure in the motor housing chamber 52, air passes through the communication hole 84 and flows from the fan housing chamber 50 to the motor housing chamber 52, and also passes through the opening 59. and flows from the motor housing chamber 52 to the fan housing chamber 50. Therefore, even when the pressure in the fan housing chamber 50 becomes higher than the pressure in the motor housing chamber 52, air flows through the motor housing 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 high temperature.

Further, as shown in FIG. 3, the communication hole 84 is arranged to overlap with the centrifugal fan 70 in the direction of the rotating shaft 62a. In this configuration, centrifugal fan 70 sends air radially outward. Therefore, by arranging the communication hole 84 so as to overlap the centrifugal fan 70 in the direction of the rotating shaft 62a, the air sent out by the centrifugal fan 70 passes through the communication hole 84 from the fan accommodation chamber 50 to the motor accommodation chamber. 52 can be suppressed. Thereby, a decrease in the blowing flow rate of the blower 2 can be suppressed.

Further, the blower 2 further includes a battery B that supplies power to the motor 62. This configuration allows the blower 2 to be used even in work areas where no external power source is present.

Further, battery B is arranged close to control board 66. With this configuration, the length of the wiring connecting battery B and control board 66 can be shortened. This allows for better wiring.

The blower 2 is disposed in the motor housing chamber 52 and further includes radiation fins 68 that guide air flowing through the motor housing chamber 52. The heat radiation fin 68 is arranged on the control board 66. In this configuration, air is guided by the radiation fins 68 and flows over the control board 66 . Thereby, the control board 66 can be efficiently cooled. As a result, it is possible to prevent the control board 66 from becoming high temperature.

Further, as shown in FIG. 3, the blower 2 further includes a cooling fan 72 disposed between the opening 59 and the centrifugal fan 70 in the direction of the rotating shaft 62a. Cooling fan 72 rotates together with centrifugal fan 70 . In this configuration, when the cooling fan 72 rotates, the pressure in the space near the cooling fan 72 decreases. Thereby, air can efficiently flow from the motor housing chamber 52 to the fan housing chamber 50 via the opening 59. Therefore, the flow rate of air flowing through the motor housing 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 high temperature.

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

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

Further, as shown in FIG. 3, the blower 2 further includes a motor housing 64 that houses the motor 62. The motor housing 64 has a motor intake port 78 that takes air into the motor housing 64 . The control board 66 is arranged on an imaginary line connecting the communication hole 84 and the motor intake port 78. In this configuration, the control board 66 is disposed 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 high temperature.

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 around the rotating shaft 62a due to rotation of the motor 62. The casing 4 accommodates a motor 62 and a centrifugal fan 70, and guides air from the intake port 54 to the discharge port 58 as the centrifugal fan 70 rotates. Trigger 24 is pushed in by the operator. The control board 66 controls the driving of the motor 62. As shown in FIG. 8, the control board 66 operates in a normal mode M1 in which the rotation speed of the motor 62 is adjusted according to the amount of depression of the trigger 24, and in a case where the amount of depression of the trigger 24 in normal mode M1 is the maximum amount. A relaxation mode M2 is provided in which the rotation speed of the motor 62 is adjusted to a target rotation speed R2 lower than the maximum rotation speed R1 of the motor 62. 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. Thereby, in the relaxation mode M2, suction of pebbles can be suppressed more than in the normal mode M1. As a result, by setting the control board 66 to the relaxation mode M2, it is possible to stably suppress the suction of pebbles.

Further, as shown in FIG. 8, when the control board 66 is in the relaxation mode M2, the amount of depression 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 air sucked into the intake port 54 changes depending on the amount by which the trigger 24 is pressed down. Therefore, the rotational speed of the motor 62, that is, the flow rate of air sucked into the intake port 54, can be freely adjusted depending on the state of the work area.

The blower 2 further includes a switch 42 that switches the control board 66 between the normal mode M1 and the relaxation mode M2. With this configuration, the operator can switch between the normal mode M1 and the relaxation mode M2 by simply pressing the main power switch 42.

Further, the switch 42 is a main power switch 42 that switches between an on state in which the motor 62 is allowed to drive and an off state in which the motor 62 is prohibited from being driven. When the main power switch 42 is pressed for a long time, the control board 66 switches between the normal mode M1 and the relaxation mode M2. With this configuration, the operator can use the main power switch 42 to switch the blower 2 between the on state and the off state, 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.

The blower 2 further includes a display section 44 capable of displaying that the control board 66 is in the relaxation mode M2. With this configuration, the operator can easily check whether 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, if a metal material such as the metal plate 67 is not placed between the left side surface of the main casing 6 and the control board 66, the control board 66 may malfunction due to static electricity accumulated in the main casing 6. be. 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 worker who grips the main grip 14. This can prevent the control board 66 from malfunctioning due to the influence of static electricity.

(correspondence)
The motor housing chamber 52 is an example of a "first housing chamber," and the fan housing chamber 50 is an example of a "second housing chamber."

(Second example)
A second example will be described with reference to FIG. In the second embodiment, points different from the first embodiment will be explained, and explanations of the same points as 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 amount by which the trigger 24 is pressed. Further, even when the trigger 24 is not pressed, 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 remains constant regardless of the amount by which the trigger 24 is pressed. Note that the target rotation speed R3 is, for example, 70% or less of the maximum rotation speed R1 in the normal mode M1. In a 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 amount of depression of the trigger 24. With this configuration, the rotation speed of the centrifugal fan 70 is constant regardless of the amount by which the trigger 24 is pressed, and the suction force can be constant. Thereby, the operator can easily perform suction work using the blower 2.

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

The communication hole 84 according to one embodiment may be arranged radially outward of the rotating shaft 62a than the centrifugal fan 70.

The blower 2 according to one embodiment may not include the radiation fins 68.

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

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

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

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

The technical elements described in this specification or the drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims as filed. Further, the techniques illustrated in this specification or the drawings can simultaneously achieve multiple objectives, and achieving one of the objectives has technical utility in itself.

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

Claims (8)

a casing having therein a first storage chamber and a second storage chamber that communicate with each other through an opening;
a motor disposed in the first storage chamber and having a rotating shaft inserted through the opening;
a centrifugal fan that is disposed in the second storage chamber and rotates about the rotation shaft by driving the motor;
a control board that is disposed in the first storage chamber and controls driving of the motor;
The casing further includes a communication hole that communicates the first storage chamber and the second storage chamber and is located apart from the opening,
The communication hole is arranged to overlap with the centrifugal fan in the direction of the rotation axis,
When the centrifugal fan rotates, air passes through the opening and the communication hole . The blower of claim 1, further comprising a battery that powers the motor. The blower according to claim 2 , wherein the battery is located close to the control board. further comprising a radiation fin that is disposed in the first storage chamber and guides air flowing through the first storage chamber,
The blower according to any one of claims 1 to 3 , wherein the radiation fin is arranged on the control board. further comprising a cooling fan disposed between the opening and the centrifugal fan with respect to the rotation axis direction,
The blower according to any one of claims 1 to 4 , wherein the cooling fan rotates together with the centrifugal fan. The casing has a discharge port that discharges the air sent out by the centrifugal fan to the outside of the casing,
The blower further includes a blowing nozzle through which air discharged from the discharge port flows,
The blower according to any one of claims 1 to 5 , wherein the blower nozzle is a long nozzle. The blower according to any one of claims 1 to 6 , wherein the control board is arranged in a flow path of air flowing through the first storage chamber from the communication hole toward the motor. further comprising a motor housing that accommodates the motor,
The motor housing has a motor intake port that takes air into the inside of the motor housing,
The blower according to any one of claims 1 to 7 , wherein the control board is arranged on a virtual line connecting the communication hole and the motor intake port.

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