blower

Abstract

This invention provides a blower. The blower has a main body, a motor, and a fan. The fan is a single fan configured to rotate in response to the rotation of the motor shaft, discharging air from an outlet. The maximum rotational speed of the motor shaft is in the range of 50,000 rpm to 120,000 rpm. The air delivery mechanism is configured such that the area of ​​the outlet can be changed by the user, and it is configured to selectively operate in either a first mode or a second mode according to the area of ​​the outlet. The first mode refers to a mode in which the maximum airflow force discharged from the outlet is in the range of 2.5 N to 5.0 N when the motor is driven at its maximum speed, and the second mode refers to a mode in which the maximum dynamic pressure of the air discharged from the outlet is in the range of 30 kPa to 65 kPa when the motor is driven at its maximum speed. Accordingly, the user can change the area of ​​the outlet according to the work content and use the appropriate operating mode of the blower for work, thus improving convenience.

Description

Technical Field

[0001] This invention relates to an electrically powered blower. Background Technology

[0002] An electrically powered blower is known to blow away dust and other contaminants by expelling air from an outlet. For example, Japanese Patent Publication No. 2011-117442 discloses a blower (so-called dust blower) configured to generate compressed air by a centrifugal fan driven by an electric motor and to eject the generated compressed air from a nozzle. Summary of the Invention

[0003] [The technical problem that the invention aims to solve]

[0004] The aforementioned blower is a so-called multi-stage centrifugal blower, which has multiple centrifugal fans arranged in a manner extending along the axis of rotation. This type of blower tends to be large in size along the direction of the axis of rotation.

[0005] The purpose of this invention is to provide a relatively small and convenient blower.

[0006] [Technical solutions used to solve technical problems]

[0007] According to one aspect of the present invention, a blower is provided, configured to discharge air from an outlet. The blower has a main body, a motor, and a fan. The motor is housed within the main body. The motor includes a motor body portion and a motor shaft, the motor body portion including a stator and a rotor; the motor shaft is rotatable integrally with the rotor. The fan is housed within the main body. The fan is a single fan configured to rotate in response to the rotation of the motor shaft, discharging air from the outlet. Furthermore, the term "single fan" here means that only one fan discharges air from the outlet. Therefore, the possibility of additional fans for cooling the motor is not excluded.

[0008] The maximum speed of the motor shaft is in the range of 50,000 to 120,000 rpm. Furthermore, if the motor speed can be set in multiple stages or steplessly, it is acceptable as long as the highest value of any settable speed is within the range of the motor's maximum speed.

[0009] The air supply mechanism is designed so that the area of ​​the exhaust outlet can be changed by the user. Furthermore, the air supply mechanism selectively operates in either Mode 1 or Mode 2, depending on the area of ​​the exhaust outlet. Mode 1 refers to a mode where the maximum airflow force discharged from the exhaust outlet is in the range of 2.5 Newtons (N) to 5.0 N when the motor is driven at its highest speed. Mode 2 refers to a mode where the maximum dynamic pressure of the air discharged from the exhaust outlet is in the range of 30 kPa to 65 kPa when the motor is driven at its highest speed.

[0010] In this type of blower, only one fan is used for exhausting air, and a high-speed motor is employed. Therefore, compared to multi-stage blowers with multiple fans, the main body can be miniaturized along the fan's rotation axis while still delivering stronger airflow. Furthermore, depending on the job requirements, the pressure of the exhaust air is sometimes more important than the airflow intensity in a blower. This type of blower can selectively operate in either a first mode (maximum airflow) or a second mode (maximum dynamic pressure) based on the outlet area. Therefore, users can adjust the outlet area according to the job requirements and use the appropriate operating mode of the blower, improving convenience. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of a dust blower.

[0012] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0013] Figure 3 This is a partial rear view of the dust blower.

[0014] Figure 4 yes Figure 1 Sectional view IV-IV.

[0015] Figure 5 It is a 3D view of the motor assembly.

[0016] Figure 6 This is a cross-sectional view of the motor assembly (excluding the support components and circuit board).

[0017] Figure 7 yes Figure 4 Sectional view VII-VII (where the supporting components and circuit board are omitted).

[0018] Figure 8 It is a three-dimensional exploded view of the cylindrical outer shell, sealing ring, and fixing components.

[0019] Figure 9It is an exploded three-dimensional view of the main body, the second filter, the filter holder, the first filter, and the intake side cover.

[0020] Figure 10 This is a 3D view of the main body with the air intake side cover removed.

[0021] Explanation of reference numerals in the attached figures

[0022] 1: Dust blower; 10: Exhaust port; 20: Main body; 201: Left side shell; 202: Right side shell; 205: First space; 206: Second space; 21: Cylindrical outer shell; 211: Recess; 213: Protruding piece; 215: Fixing component; 216: Peripheral wall; 217: Pressing part; 218: Opening; 22: Receiving part; 23: Nozzle part; 230: Opening; 231: Nozzle mounting 235: Locking mechanism; 24: Outer housing; 240: Opening; 241: Filter mounting part; 243: Flange; 245: Protrusion; 247: Engaging groove; 248: Wall; 25: Air inlet side cover; 250: Air inlet; 251: Protrusion; 253: Recess; 254: Spring pin; 27: Handle; 28: Grip; 281: Trigger; 283: Switch; 29: Controller 291: Controller; 292: Operating section; 294: Battery mounting section; 295: Battery; 3: Motor assembly; 31: Housing; 311: Peripheral wall; 312: Second opening; 313: Bearing support; 315: Cover; 316: First opening; 32: Bearing; 33: Motor; 330: Motor body; 331: Stator; 333: Rotor; 335: Motor shaft; 35: Fan; 37: Support component; 371: First arm; 372: Second arm; 373: Elastic cover; 38: Circuit board; 39: Sealing ring; 391: Outer flange; 393: Inner flange; 41: First filter; 42: Second filter; 45: Filter holder; 451: Protrusion; 8: Nozzle; 80: Opening; 81: Mounting section; 87: Passage section; A1: Rotation axis. Detailed Implementation

[0023] In a representative and non-limiting embodiment of the present invention, the area of ​​the discharge port can also vary within a range of more than the area of ​​a circle with a diameter of 6 mm and less than the area of ​​a circle with a diameter of 15 mm. Furthermore, the area of ​​the discharge port is defined by its relationship to the area of ​​the circle, but it is not necessarily required that the discharge port be circular. The shape of the discharge port is typically circular, but it can be other shapes as long as its area is within the aforementioned range. When the discharge port is circular, the aforementioned feature can be described as "the diameter of the discharge port is in the range of 6 mm to 15 mm". According to this embodiment, a reasonable range of discharge port area that enables either the first mode or the second mode can be provided while suppressing the possibility of surge.

[0024] In addition to, or instead of, the above-described embodiments, the main body may also be configured to be able to detach and install one of a variety of nozzles with different opening areas at the top. Furthermore, the area of ​​the discharge port can be changed at least by replacing the nozzle. According to this embodiment, the user can easily change the area of ​​the discharge port by replacing the nozzle.

[0025] In addition to, or instead of, the above-described embodiments, the diameter of the fan can also be in the range of 40mm to 45mm. According to this embodiment, by using a fan with a relatively small diameter, it is possible to avoid the main body becoming too large in the radial direction of the fan.

[0026] In addition to, or instead of, the above-described embodiments, the maximum speed of the motor shaft can also be in the range of 70,000 rpm to 90,000 rpm. The maximum airflow in the first mode can also be in the range of 3.0 N to 4.0 N. The maximum dynamic pressure in the second mode can also be in the range of 35 kPa to 50 kPa. According to this embodiment, by using a motor with a maximum speed within a reasonable range, a blower can be achieved that can exert a relatively strong maximum airflow in the first mode and a relatively high maximum dynamic pressure in the second mode.

[0027] In addition to, or instead of, the above-described embodiments, the blower may be configured to operate in a first mode when the area of ​​the outlet is greater than or equal to the area of ​​a circle with a diameter of 12 mm and less than or equal to the area of ​​a circle with a diameter of 15 mm, and to operate in a second mode when the area of ​​the outlet is greater than or equal to the area of ​​a circle with a diameter of 6 mm and less than or equal to the area of ​​a circle with a diameter of 8 mm. Furthermore, as mentioned above, the outlet does not necessarily need to be circular. When the outlet is circular, the aforementioned feature can be described as "operating in the first mode when the diameter of the outlet is in the range of 12 mm to 15 mm, and operating in the second mode when the diameter of the outlet is in the range of 6 mm to 8 mm." According to this embodiment, a reasonable range of outlet area is provided that enables either the first mode or the second mode to be implemented respectively.

[0028] In addition to, or instead of, the above-described embodiments, a circuit board may be included, which is electrically connected to the motor body. A fan may also be located axially along the motor shaft between the air inlet formed on the main body and the motor body. The circuit board may also be located axially along the motor shaft between the motor body and the exhaust port. According to this embodiment, the motor body and the circuit board can be cooled by air supplied from the fan and flowing towards the exhaust port.

[0029] In addition to, or instead of, the above-described embodiments, the motor and fan may be housed within a housing, forming an integrated motor assembly together with the housing and circuit board. The circuit board may also be positioned between the housing and the exhaust port. Furthermore, a space may be provided between the motor assembly and the inner surface of the main body. According to this embodiment, even with the circuit board present, air exhausted from the housing can flow towards the exhaust port within the space between the motor assembly and the inner surface of the main body.

[0030] In addition to, or instead of, the above-described embodiments, the rotational speed of the motor shaft can be changed. According to this embodiment, in addition to changing the outlet, the airflow force discharged from the outlet can be changed by changing the rotational speed, thereby further improving convenience. Furthermore, the rotational speed can typically be changed according to manual operation by the user from the outside via the operating unit (e.g., buttons, triggers, dials, touch panels, etc.).

[0031] In addition to, or instead of, the above-described embodiments, the blower may also include a trigger that can be pressed by a user. The rotational speed of the motor shaft can also be changed according to the amount of trigger operation. According to this embodiment, the user can appropriately change the rotational speed and adjust the airflow by pressing the trigger.

[0032] Hereinafter, with reference to the accompanying drawings, a detailed and non-limiting embodiment of the dust blower 1 according to the present invention will be described. Furthermore, the drawings referred to below are sectional views. Figure 1 , Figure 2 and Figure 4 In the diagram, the motor assembly 3, described later, is shown in an integrated and schematic manner.

[0033] The dust blower 1 is an example of an electric blower. More specifically, the dust blower 1 is a type of electric blower that can blow away dust and the like by discharging compressed air from the outlet 10. In addition, the dust blower 1 is configured as a handheld power tool for use by a user.

[0034] like Figure 1 As shown, the outer contour of the blower 1 is formed by a body 20 and a handle 27, wherein the body 20 houses a motor 33 and a fan 35; and the handle 27 is for the user to hold.

[0035] In this embodiment, an air inlet 250 for drawing air into the main body 20 is provided at one end of the extension direction of the rotation axis A1 of the motor shaft 335 in the main body 20 (hereinafter also referred to as the rotation axis A1 direction). Figure 3A nozzle 8 is mounted at the other end of the main body 20 in the direction of the rotation axis A1. The opening 80 at the top of the nozzle 8 defines an outlet 10 for discharging compressed air. The handle 27, which is the part held by the user, protrudes from the main body 20 in a direction intersecting the rotation axis A1. The motor 33 and the fan 35 are located between the air inlet 250 and the outlet 10 in the direction of the rotation axis A1. With this configuration of the air inlet 250, the outlet 10, and the handle 27, a blower 1 is made easy for the user to hold and operate by the handle 27.

[0036] A trigger 281, which can be pressed (pulled) by the user, is provided at the base end of the handle 27 (the end connected to the main body 20). Additionally, a battery 295 is detachably installed at the protruding end (top portion) of the handle 27. When the user pulls the trigger 281, the motor 33 is energized, causing the fan 35 to rotate, thereby expelling compressed air from the outlet 10.

[0037] The detailed structure of the blower 1 will now be described. For ease of explanation, the direction of the rotation axis A1 will be defined as the front-to-back direction of the blower 1. In the front-to-back direction, the direction from the air inlet 250 towards the outlet 10 will be defined as the front, and the opposite direction (from the outlet 10 towards the air inlet 250) will be defined as the rear. The direction orthogonal to the rotation axis A1 and corresponding approximately to the extension direction of the handle 27 will be defined as the up-down direction. In the up-down direction, the direction in which the handle 27 protrudes from the body 20 (from the body 20 towards the protruding end of the handle 27) will be defined as the bottom, and the opposite direction (from the protruding end of the handle 27 towards the body 20) will be defined as the top. The direction orthogonal to both the front-to-back and up-down directions will be defined as the left-to-right direction.

[0038] First, the handle 27 and its internal structure will be explained.

[0039] like Figure 1 As shown, the handle 27 is configured as a hollow body, which includes a cylindrical grip portion 28 extending generally in the vertical direction and a rectangular box-shaped controller receiving portion 29 connected to the lower end of the grip portion 28. Furthermore, in this embodiment, the handle 27 is integrally formed with the outer shell 24 of the main body 20 using synthetic resin, but details will be described later.

[0040] The grip 28 is the part held by the user when using the blower 1 (during operation). A trigger 281 is located on the front side of the upper end of the grip 28. A switch 283 is housed within the grip 28. The switch 283 is normally in the off state and becomes on in response to the pulling operation of the trigger 281. The switch 283 is electrically connected to the controller 291 via a wire (not shown). The switch 283 is configured to output a signal to the controller 291 corresponding to the amount of operation (pulling amount) of the trigger 281 when switched to the on state.

[0041] A controller 291 is housed within the controller housing 29. The controller 291 is configured to control various operations of the dust blower 1, such as the drive control of the motor 33. Furthermore, in this embodiment, the controller 291 includes a microcomputer, which includes a CPU, ROM, RAM, and memory.

[0042] Additionally, an operation unit 292, which allows for external operation by the user, is provided on the upper part of the controller housing 29. The operation unit 292 is configured to accept input information for setting the rotational speed of the motor 33 in response to external user operation. In this embodiment, the operation unit 292 has a push-button switch, but detailed illustrations are omitted. The operation unit 292 is electrically connected to the controller 291 via a wire (not shown), and outputs a predetermined signal to the controller 291 in response to pressing the push-button switch. Furthermore, in this embodiment, the rotational speed of the motor 33 can be set to four levels by pressing the push-button switch. Specifically, the rotational speed of the motor 33 can be selected from 80,000 revolutions per minute (rpm), 60,000 rpm, 40,000 rpm, and 20,000 rpm. That is, the maximum rotational speed of the motor 33 in this embodiment is 80,000 rpm.

[0043] The controller 291 is configured to steplessly control the speed of the motor 33 according to the speed selected by the user and the signal output from the switch 283 (i.e., the operation amount of the trigger 281). Specifically, the controller 291 controls the drive of the motor 33 so that the actual speed of the motor 33 is the speed obtained by multiplying the selected speed by a ratio corresponding to the operation amount of the trigger 281.

[0044] Additionally, a battery mounting section 294 is provided at the lower end of the controller housing 29, through which a rechargeable battery (also referred to as a battery pack) 295 can be detachably mounted. The battery mounting section 294 includes: a track structure that engages with a slot provided in the battery 295; and terminals that can be electrically connected to the terminals of the battery 295. Furthermore, the structures of the battery mounting section 294 and the battery 295 are well known and therefore their description is omitted here.

[0045] Next, the main body 20 will be explained. For example... Figures 2-4 As shown, the main body 20 includes a cylindrical outer shell 21, an outer shell 24, and an air intake side cover 25.

[0046] The cylindrical housing 21 includes a receiving portion 22 and a nozzle portion 23. The receiving portion 22 is the part of the cylindrical housing 21 that houses the motor 33 and the fan 35. The receiving portion 22 is formed as a cylinder with a substantially uniform inner diameter and outer diameter. The nozzle portion 23 is integrally formed as a funnel shape that tapers at the front end and extends forward from the front end of the receiving portion 22. Furthermore, in this embodiment, in order to suppress air leakage from the receiving portion 22 and the nozzle portion 23, the receiving portion 22 and the nozzle portion 23 are formed as a single unit (cannot be separated). However, the receiving portion 22 and the nozzle portion 23 may also be formed as separate components and connected to each other.

[0047] The front end of the nozzle portion 23 is formed in a generally cylindrical shape. The nozzle 8 can be detachably mounted on the front end of the nozzle portion 23. More specifically, a locking mechanism 235 is provided on the outer periphery of the front end of the nozzle portion 23, which is configured to lock the nozzle 8 relative to the main body 20 in a predetermined mounting position. The nozzle 8 is mounted on the front end of the nozzle portion 23 via this locking mechanism 235. Therefore, the front end of the nozzle portion 23 will be referred to below as the nozzle mounting portion 231. Furthermore, when no nozzle is mounted on the nozzle mounting portion 231, the opening 230 at the front end of the nozzle portion 23 functions as the exhaust port 10 of the dust blower 1. Air passes from rear to front within the nozzle portion 23 and is discharged forward from the opening 230 (exhaust port 10). Furthermore, the opening 230 of the nozzle portion 23 is circular with a diameter of 13.0 mm.

[0048] The locking mechanism 235 of this embodiment has a substantially identical structure to the locking mechanism disclosed in another application filed by the applicant of this application, namely US Patent Application No. 17 / 370,671 (the entire contents of which are incorporated herein by reference), but detailed structural descriptions and illustrations are omitted. The locking mechanism 235 operates in response to a user's operation of moving the nozzle 8 rearward relative to the blower 1, locking the nozzle 8 in the installed position. Furthermore, the locking mechanism 235 releases the locking of the nozzle 8 in response to a user's operation of rotating the nozzle 8 about its axis.

[0049] Here, the nozzle 8 will be described. The nozzle 8 is an accessory that is additionally installed on the dust blower 1 and used with the dust blower 1.

[0050] More specifically, the nozzle 8 is generally cylindrical and has a through hole extending axially. The nozzle 8 of this embodiment includes a mounting portion 81 and a passage portion 87 coaxially connected. The mounting portion 81 is configured to connect to the main body 20 of the blower 1 (specifically, a locking mechanism 235). The passage portion 87 is an elongated cylindrical body that extends axially from one end of the mounting portion 81. When the nozzle 8 is mounted on the main body 20, the opening 80 at the top of the passage portion 87 defines the outlet 10 of the blower 1. When the nozzle 8 is mounted on the blower 1, compressed air flows into the passage portion 87 from the opening 230 of the nozzle portion 23, passes through the passage portion 87 from rear to front, and is discharged forward from the opening 80 (outlet 10) of the nozzle 8.

[0051] Furthermore, in addition to the nozzle 8 shown in this embodiment, various other nozzles with different axial lengths and / or opening 80 (exhaust port 10) diameters (hereinafter referred to as nozzle diameters) are prepared as the nozzle 8 that can be installed on the dust blower 1. More specifically, the nozzle 8 shown in this embodiment has a nozzle diameter of 12 mm and an opening 80 (exhaust port 10) area of ​​36π square millimeters (mm²). 2 In addition to the nozzle 8, various nozzles 8 with nozzle diameters ranging from 6 mm to 15 mm are also prepared. That is, the area of ​​the opening 80 (discharge port 10) is prepared ranging from 9 mm². 2 up to 56.25πmm 2 A variety of nozzles 8 are available within the range. Users can use the blower 1 with or without nozzles 8 installed, depending on the job requirements.

[0052] The outer casing 24 is generally cylindrical and covers a portion of the cylindrical outer casing 21 (specifically, the receiving portion 22). The rear end of the outer casing 24 protrudes rearward beyond the cylindrical outer casing 21. Therefore, the rear end of the receiving portion 22 is completely disposed inside the outer casing 24. An opening 240, which is generally circular when viewed from the rear, is formed at the rear end of the outer casing 24. A portion of the cylindrical outer casing 21 (specifically, the nozzle portion 23) protrudes forward from the opening at the front end of the outer casing 24.

[0053] Furthermore, in this embodiment, the outer housing 24 is integrally formed with the handle 27 using synthetic resin. More specifically, the left side portion of the outer housing 24 and the left side portion of the handle 27 are integrally formed to form the left housing 201 (the left-side split body). Similarly, the right side portion of the outer housing 24 and the right side portion of the handle 27 are integrally formed to form the right housing 202 (the right-side split body). The left housing 201 and the right housing 202 are connected and fixed in the left-right direction by screws, thereby forming the outer housing 24 and the handle 27, and the cylindrical outer housing 21 and the outer housing 24 are connected together in a manner that substantially prevents relative movement.

[0054] The intake side cover 25 is a cover component (cap) that covers the opening 240 at the rear end of the outer housing 24 (more specifically, the filter mounting part 241 described later). The intake side cover 25 is a generally circular component that is fitted into the opening 240. Furthermore, the engagement structure between the intake side cover 25 and the main body 20 will be described in detail later. A plurality of air inlets 250 are formed on the intake side cover 25 (see...). Figure 3 When the fan 35 rotates, air is drawn in from the outside of the main body 20 through the air inlet 250.

[0055] The internal structure of the main body 20 will now be described.

[0056] like Figure 2 As shown, the main body 20 is equipped with a motor 33, a fan 35, and two filters (a first filter 41 and a second filter 42). When the blower 1 is viewed from a direction orthogonal to the axis of rotation A1 (e.g., left or right), the air inlet 250, the first filter 41, the second filter 42, the fan 35, the motor 33, and the outlet 10 are arranged in this order facing forward on a straight line extending in the front-back direction.

[0057] First, the motor 33 and fan 35 will be described. In this embodiment, the motor 33 and fan 35, together with associated components, are integrated to form a motor assembly 3. Furthermore, the motor assembly 3, as an integrated component, is supported inside the main body 20. More specifically, as... Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the motor assembly 3 includes a housing 31, two bearings 32, a motor 33, a fan 35, a support component 37, and a circuit board 38. Furthermore, in Figure 6 For ease of explanation, the illustrations of support component 37 and circuit board 38 are omitted.

[0058] The housing 31 is a hollow body that houses the motor 33 and fan 35 and supports the bearings 32. It includes a peripheral wall portion 311, a cover portion 315, and two bearing support portions 313. The peripheral wall portion 311 is a cylindrical wall portion with the front-to-back direction as the axial direction. The cover portion 315 is formed as a short, bottomed cylinder and is embedded and fixed to the peripheral wall portion 311 to cover the rear end opening of the peripheral wall portion 311. The rear wall portion of the cover portion 315 is arranged orthogonally to the rotation axis A1. A circular first opening 316 communicating between the interior and exterior of the housing 31 is provided in the center of the rear wall portion of the cover portion 315. The bearing support portions 313 are integrally provided with the peripheral wall portion 311 in the front and rear ends of the peripheral wall portion 311. Two bearings 32 (specifically, the outer rings of ball bearings) are respectively embedded and supported in the bearing support portions 313. A second opening 312 is formed between the peripheral wall portion 311 and the bearing support portion 313, which connects the interior and exterior of the housing 31.

[0059] Motor 33 is an internal rotor type brushless motor, including a motor body 330 and a motor shaft 335, wherein the motor body 330 includes a stator 331 and a rotor 333. The stator 331 is fixedly supported to the housing 31 by multiple ribs provided on the inner circumferential surface of the peripheral wall portion 311 of the housing 31. The rotor 333 and the motor shaft 335 are integrally rotatably fixed. The motor shaft 335 is located in front of and behind the rotor 333, and is supported by two bearings 32 supported in the bearing support portion 313 of the housing 31 in a manner that allows it to rotate about the rotation axis A1. The rear end of the motor shaft 335 is disposed within the cover portion 315.

[0060] Only one fan 35 is fixed to the rear end of the motor shaft 335 (the end disposed within the cover 315). The fan 35 is a centrifugal fan that draws in air from the rear along the rotation axis A1 and expels the air radially outward. In this embodiment, the diameter of the fan 35 is 43 mm. The thickness of the fan 35 in the rotation axis A1 direction is 6 mm. By using only one relatively small fan 35, it is possible to avoid the main body 20 becoming large in both the rotation axis A1 direction and radially of the fan 35.

[0061] The fan 35 is configured such that the central portion of the intake side faces the first opening 316 of the shroud 315. When the fan 35 rotates, air is drawn into the housing 31 through the first opening 316 at the rear end of the housing 31 (shroud 315). The air delivered radially outward to the fan 35 flows along the rotation axis A1 within the housing 31, cooling the motor 33 as it passes around the stator 331 and between the stator 331 and the rotor 333, and exits to the outside of the housing 31 through the second opening 312 at the front end of the housing 31. That is, the first opening 316, located at the rear end of the housing 31 (shroud 315), functions as an intake port for air to flow into the housing 31. The second opening 312 at the front end of the housing 31 functions as an exhaust port for air to be discharged from the housing 31.

[0062] The support member 37 is fixed to the front end of the housing 31. The support member 37 has: a first arm 371 that extends forward of the housing 31; and two second arms 372 that extend forward and radially outward of the housing 31.

[0063] The first arm 371 supports the circuit board 38. The circuit board 38 is generally circular and has a diameter similar to the outer diameter of the housing 31. The circuit board 38 is supported in a manner approximately orthogonal to the rotation axis A1 at a position away from the housing 31. Control circuitry, etc., is mounted on the circuit board 38, which controls the energization of the coils of the stator 331 according to control signals from the controller 291. The circuit board 38 is electrically connected to the controller 291 and the stator 331 via wires not shown. Two second arms 372 are arranged diagonally across the rotation axis A1, extending in the front-rear direction to approximately the same position as the circuit board 38 and extending radially outward from the circuit board 38. The top ends of the second arms 372 are covered by elastic covers 373 formed of an elastomer. In this embodiment, the elastic covers 373 are formed of silicone rubber. However, the elastic covers 373 may also be formed of elastic materials other than silicone rubber (e.g., rubber, other types of elastomers).

[0064] The support structure of motor assembly 3 will be described below.

[0065] like Figure 2 and Figure 4 As shown, the motor assembly 3 is housed within the cylindrical outer shell 21 (more specifically, the housing portion 22) of the main body 20. More specifically, the motor assembly 3 is elastically connected and supported to the cylindrical outer shell 21 by the aforementioned elastic cover 373 and sealing ring 39, wherein the aforementioned elastic cover 373 is installed on the second arm 372 of the support member 37; the sealing ring 39 is disposed between the cylindrical outer shell 21 and the housing 31.

[0066] The elastic covers 373 mounted on the two second arms 372 of the support member 37 are supported in a state where they are positioned on the cylindrical outer casing 21. More specifically, as Figure 4 and Figure 7 As shown, two recesses 211 are provided on the inner circumferential surface of the cylindrical outer shell 21, extending radially outward from the inner circumferential surface. The recesses 211 are located diagonally on the inner circumferential surfaces of the left and right sides of the cylindrical outer shell 21 (receiving portion 22), respectively, across the rotation axis A1, and extend in the front-rear direction. The elastic cover 373 is configured to partially fit into the recesses 211. Furthermore, four protruding tabs (ribs) 213 are provided on the inner circumferential surface of the cylindrical outer shell 21, protruding radially inward from the inner circumferential surface of the front end of the cylindrical outer shell 21. Two protruding tabs 213 are disposed on the front side of each of the left and right recesses 211.

[0067] With the elastic covers 373 of the two second arms 372 of the support member 37 partially embedded in the recess 211 from the rear of the cylindrical housing 21, the motor assembly 3 is disposed within the cylindrical housing 21. In the front-rear direction, the motor assembly 3 is positioned such that the front end of each elastic cover 373 abuts against the rear end of the protrusion 213. Furthermore, by engaging the elastic covers 373 with the recess 211, the rotation of the motor assembly 3 relative to the cylindrical housing 21 about the rotation axis A1 is restricted.

[0068] like Figure 2 , Figure 4 and Figure 8 As shown, the sealing ring 39 is an elastomer that is integrally formed into a short, generally cylindrical (or generally annular) shape. Furthermore, in this embodiment, the sealing ring 39, like the elastic cover 373, is made of silicone rubber. However, the sealing ring 39 may also be formed of an elastic material other than silicone rubber (e.g., rubber, other types of elastomers). The outer and inner peripheral surfaces of the sealing ring 39 are configured such that, when the sealing ring 39 is slightly compressed, they substantially match the inner peripheral surface of the rear end portion of the cylindrical outer shell 21 and the outer peripheral surface of the rear end portion of the housing 31, respectively. Additionally, at the rear end portion of the sealing ring 39, an outer flange portion 391 protruding radially outward and an inner flange portion 393 protruding radially inward are provided. The outer diameter of the outer flange portion 391 is approximately equal to the outer diameter of the cylindrical outer shell 21. The inner diameter of the inner flange portion 393 is smaller than the outer diameter of the cover portion 315 of the housing 31.

[0069] The sealing ring 39 is connected to the cylindrical housing 21 via a fixing member 215. The fixing member 215 includes a peripheral wall portion 216 that can be embedded around the rear end portion of the cylindrical housing 21; and a pressing portion 217 having a shape substantially the same as the rear surface of the sealing ring 39. That is, the pressing portion 217 is formed in a substantially annular shape. A plurality of ribs (finger guards) are disposed at an opening 218 in the center of the pressing portion 217, the ribs extending radially and connected to the pressing portion 217. The opening 218 functions as a vent (air inlet of the cylindrical housing 21), wherein the vent allows air to enter from the air inlet 250 (see reference 250). Figure 3 The air flowing into the outer shell 24 flows into the cylindrical outer shell 21.

[0070] Multiple holes for screws are provided circumferentially on the pressing portion 217 of the fixing member 215 and the sealing ring 39, respectively. A screw is inserted from the rear of the pressing portion 217 into the holes of the pressing portion 217 and the sealing ring 39, and screws into the threaded hole provided in the cylindrical housing 21. Accordingly, the sealing ring 39 is pressed onto the cylindrical housing 21 and the housing 31 by the fixing member 215. Accordingly, the outer flange portion 391 and the inner flange portion 393 of the sealing ring 39 are respectively in close contact with the rear end face of the cylindrical housing 21 and the rear surface of the rear wall portion of the cover portion 315. Furthermore, the portion of the sealing ring 39 other than its rear end is embedded radially between the rear end of the housing 31 (cover portion 315) and the rear end of the cylindrical housing 21 in a slightly compressed state, in close contact with the outer circumferential surface of the housing 31 and the inner circumferential surface of the cylindrical housing 21.

[0071] As described above, the cylindrical outer casing 21 is connected to the outer casing 24 with the motor assembly 3 assembled inside and the sealing ring 39 and the fixing member 215 connected together. More specifically, the cylindrical outer casing 21 is positioned by ribs (protrusions) or the like provided on the inner circumferential surface of the outer casing 24, and is held in a state where it is clamped by the left casing 201 and the right casing 202 without being able to move relative to the outer casing 24.

[0072] Based on the structure and configuration described above, such as Figure 2 and Figure 4As shown, the sealing ring 39 isolates the space between the main body 20 (cylindrical outer shell 21, outer shell 24, and air inlet side cover 25) and the motor assembly 3 (specifically, housing 31) from the first space 205 and the second space 206. The first space 205 communicates with the air inlet 250 and the first opening 316 at the rear end of the housing 31, while the second space 206 communicates with the second opening 312 at the front end of the housing 31 and the outlet 10. The first space 205 and the second space 206 can also be referred to as the air inlet side space of the fan 35 and the air outlet side space of the fan 35, respectively. Furthermore, in this embodiment, the first space 205 and the second space 206 can also be referred to as the space behind and the space at the front of the sealing ring 39, respectively, in the front-rear direction. The sealing ring 39 prevents air flowing into the second space 206 from flowing into the first space 205 from the second opening 312 at the front end of the housing 31. This suppresses the reduction in air supply efficiency.

[0073] Furthermore, the second space 206 is a space formed inside the cylindrical outer casing 21 where air compressed by the fan 35 flows. In this embodiment, the second space 206 is formed inside the cylindrical outer casing 21, which is a single component. Therefore, it is possible to prevent the air supplied to the second space 206 from leaking out from a part other than the outlet 10, thereby effectively suppressing the pressure drop inside the second space 206.

[0074] Furthermore, in this embodiment, the sealing ring 39 is formed in a cylindrical (annular) shape, a portion of which can be radially fitted between the inner circumferential surface of the cylindrical outer shell 21 and the outer circumferential surface of the shell 31. Therefore, the first space 205 and the second space 206 can be easily and reliably isolated by the sealing ring 39 with its simple structure.

[0075] Furthermore, as described above, in this embodiment, when the blower 1 is viewed from a direction orthogonal to the rotation axis A1 (e.g., to the left), the air inlet 250, the motor assembly 3, and the outlet 10 are arranged in a straight line. Therefore, it is possible to generate an efficient airflow from the air inlet 250 through the motor assembly 3 to the outlet 10.

[0076] As described above, in this embodiment, a circuit board 38 is disposed between the housing 31 of the motor assembly 3 (specifically, the second opening 312 of the housing 31) and the outlet 10. Therefore, the air flowing out from the second opening 312 of the housing 31 can effectively cool not only the motor body 330 (stator 331, rotor 333) but also the circuit board 38. Furthermore, in the radial direction, since a space is provided between the inner circumferential surface of the cylindrical outer casing 21 and the motor assembly 3, it is possible to prevent the air flowing out from the second opening 312 from being blocked by the circuit board 38 and thus hindering its flow to the outlet 10.

[0077] Furthermore, in this embodiment, the motor assembly 3 is held separate from the inner circumferential surface of the cylindrical housing 21 by means of the sealing ring 39 and the elastic cover 373. That is, the motor assembly 3 and the main body 20 (cylindrical housing 21) are elastically connected by the sealing ring 39 and the elastic cover 373. Therefore, the motor assembly 3 and the main body 20 can move relative to each other in all directions. Accordingly, the transmission of vibrations generated by the drive motor 33 from the motor assembly 3 to the main body 20 (cylindrical housing 21), and even to the outer housing 24 and the handle 27, can be effectively suppressed.

[0078] Furthermore, in this embodiment, the sealing ring 39, in addition to functioning to isolate the first space 205 and the second space 206, also functions to reduce the transmission of vibration from the motor assembly 3 to the main body 20. Similarly, the elastic cover 373, in addition to positioning the motor assembly 3 relative to the main body 20, also functions to reduce the transmission of vibration from the motor assembly 3 to the main body 20. Therefore, air delivery efficiency, ease of assembly, and vibration resistance can be improved without increasing the number of parts.

[0079] The first filter 41 and the second filter 42 and their support structure will be described below.

[0080] like Figure 2 , Figure 4 and Figure 9 As shown, the first filter 41 and the second filter 42 are disposed within the rear end of the main body 20 between the intake side cover 25 and the motor assembly 3. Furthermore, the rear end of the main body 20 (more specifically, the outer housing 24) will be referred to below as the filter mounting portion 241. In this embodiment, the filter mounting portion 241 is formed in a generally cylindrical shape.

[0081] The second filter 42 is positioned forward (on the motor assembly 3 side) of the first filter 41 within the filter mounting section 241. In this embodiment, the first filter 41 and the second filter 42 are filters with different mesh densities. More specifically, the second filter 42 is a filter with sparser meshes than the first filter 41 (i.e., allowing larger foreign objects (e.g., larger diameter particles) to pass through). In this embodiment, the first filter 41 and the second filter 42 are each filters formed from open-cell bubble structures of synthetic resin. More specifically, the first filter 41 and the second filter 42 are each made of polyurethane resin sponges with different mesh densities (pore size and configuration). The filters formed from open-cell bubble structures can suppress wind speed reduction while effectively capturing foreign objects.

[0082] Furthermore, the first filter 41 and the second filter 42 can also be filters other than those with an open-cell bubble structure, depending on the main operating environment. For example, HEPA (High Efficiency Particulate Air Filter), powder filters, or non-woven fabric filters can be preferred.

[0083] In this embodiment, the first filter 41 is installed (held) in the filter mounting portion 241 in a manner that allows it to be easily removed from the outer housing 24. On the other hand, the second filter 42 is installed (held) in the outer housing 24 in a manner that makes it difficult to remove from the filter mounting portion 241.

[0084] More specifically, a filter holder 45 is disposed behind the aforementioned fixing member 215, and the second filter 42 is held between the fixing member 215 and the filter holder 45 in the front-rear direction. The filter holder 45 is a short, cylindrical member. A plurality of protrusions 451 protruding radially inward are provided on the inner circumferential surface of the rear end portion of the filter holder 45. The length of each protrusion 451 is approximately half the distance between the inner circumferential surface of the filter holder 45 and the center of the filter holder 45.

[0085] On the inner circumferential surface of the filter mounting portion 241, a flange portion 243 is provided behind the cylindrical outer casing 21, protruding radially inward from the inner circumferential surface of the filter mounting portion 241. Additionally, two protrusions 245 are provided at a position receding rearward from the flange portion 243. The two protrusions 245 protrude radially inward from the inner circumferential surfaces of the left and right sides of the filter mounting portion 241, respectively. A second filter 42 and a filter holder 45 are disposed between the flange portion 243 and the two protrusions 245 in the front-rear direction, and are connected together by the left outer casing 201 and the right outer casing 202, thereby holding the second filter 42 and the filter holder 45 in the filter mounting portion 241.

[0086] The second filter 42 covers the entire opening 218 (vent) of the fixing member 215, which is fixed to the rear end of the cylindrical housing 21. The protrusion 451 of the filter holder 45 prevents the second filter 42 from being easily removed from the filter holder 45 or even the main body 20. More specifically, the protrusion 451 interferes with the outer periphery of the second filter 42, restricting its movement in the direction of separation from the main body 20 (rearward). Therefore, when removing the second filter 42 from the filter holder 45, the user needs to pinch the central portion of the second filter 42 (the portion not pressed by the protrusion 451) and pull it out with a certain amount of force.

[0087] On the other hand, the first filter 41 is embedded only within the filter mounting portion 241 behind the protrusion 451 of the filter holder 45. The first filter 41 has a diameter slightly larger than the inner diameter of the filter mounting portion 241. When the first filter 41 is embedded within the filter mounting portion 241, the entire outer peripheral surface of the first filter 41 (except for the air bubble portion) contacts the inner peripheral surface of the filter mounting portion 241. The first filter 41 covers the entire opening of the filter holder 45.

[0088] Behind the first filter 41, the intake side cover 25 is detachably mounted to the filter mounting section 241. More specifically, as... Figure 9 and Figure 10 As shown, engaging grooves 247 are formed on the inner circumferential surfaces of the upper rear end and lower rear end of the filter mounting portion 241, respectively. The engaging groove 247 is an L-shaped groove, including a first portion extending forward from the rear end of the outer housing 24 and a second portion extending circumferentially from the front end of the first portion. That is, a wall portion 248 is present on the rear side of the second portion.

[0089] On the other hand, two protrusions 251 protrude radially outward from the outer peripheral surface of the intake side cover 25. Additionally, two recesses 253 are provided on the outer peripheral surface of the intake side cover 25. A cylindrical elastic pin 254 is embedded and held in the recess 253. The elastic pin 254 protrudes slightly radially outward from the intake side cover 25. Furthermore, in this embodiment, the elastic pin 254 is made of rubber (rubber pin), but it may also be formed of other elastic materials (e.g., synthetic resin).

[0090] When the intake side cover 25 is installed in the filter mounting portion 241, the user moves the intake side cover 25 forward relative to the filter mounting portion 241 so that the protrusions 251 enter the first portion of the engaging grooves 247 from the rear. Afterward, the user rotates the intake side cover 25 so that the protrusions 251 move circumferentially within the second portion. Accordingly, the protrusions 251 are positioned on the front side of the wall portion 248. The wall portion 248 abuts against the protrusions 251 from the rear, preventing the intake side cover 25 from moving rearward. Furthermore, the resilient pin 254 contacts the inner circumferential surface of the filter mounting portion 241 to generate frictional resistance, thereby limiting the rotation of the intake side cover 25 relative to the outer housing 24. That is, the resilient pin 254 reduces the possibility of the intake side cover 25 disengaging from the filter mounting portion 241.

[0091] On the other hand, by moving the intake side cover 25 relative to the filter mounting portion 241 in the opposite direction to the installation direction, the user can easily remove the intake side cover 25 from the filter mounting portion 241. As described above, since the first filter 41 is only embedded in the filter mounting portion 241, the user can easily remove the first filter 41 from the outer housing 24 after removing the intake side cover 25.

[0092] As described above, in the dust blower 1 of this embodiment, the airflow generated by the fan 35 flows into the main body 20 from the air inlet 250 and is cooled by the motor 33 before reaching the outlet 10. Therefore, when foreign objects (e.g., dust) enter the main body 20 from the air inlet 250, they may adversely affect the motor 33. In this embodiment, the first filter 41 and the second filter 42 trap foreign objects flowing into the main body 20 between the air inlet 250 and the motor 33 (specifically, the first opening 316 of the housing 31), which helps to protect the motor 33.

[0093] Furthermore, since the first filter 41 is simply embedded in the filter mounting part 241, the user can easily remove the first filter 41 from the main body 20 for cleaning or replacement. This prevents a decrease in air delivery efficiency due to clogging of the mesh of the first filter 41. In addition, in this embodiment, a second filter 42 is provided in addition to the first filter 41. Therefore, even with the first filter 41 removed, the second filter 42 can also capture foreign objects before they reach the motor 33.

[0094] Furthermore, in this embodiment, the mesh size of the second filter 42 is sparser than that of the first filter 41. This is because the second filter 42, which is difficult to disassemble, clean, or replace, is preferably a filter that is less prone to clogging (with sparser mesh). On the other hand, the first filter 41, which is easy to disassemble and clean or replace even if clogged with foreign objects, is a filter with higher foreign object capture performance (with denser mesh), thereby achieving a reasonable structure that can capture foreign objects in two stages.

[0095] The following describes the operating mode of the blower 1.

[0096] As described above, in this embodiment, the blower 1 is configured to use a single fan 35 to discharge compressed air from the outlet 10. Therefore, compared to a multi-stage blower with multiple fans, the main body 20 can be miniaturized in the direction of the rotation axis A1. In addition, by employing a relatively high-speed motor 33 with a maximum rotation speed of 80,000 rpm, relatively strong airflow and relatively high dynamic pressure can be achieved even with only a single fan 35.

[0097] Furthermore, the blower 1 is configured to allow for changes in the area of ​​the outlet 10. Specifically, the area of ​​the outlet 10 can be changed depending on whether a nozzle 8 is installed on the blower 1, and / or the type of nozzle 8 installed. More specifically, when no nozzle 8 is installed on the blower 1, the area of ​​the outlet 10 is the area of ​​the opening 230 of the nozzle portion 23 of the main body 20 (i.e., the area of ​​a circle with a diameter of 13 mm (42.25 mm)).2 On the other hand, when a nozzle 8 is installed on the blower 1, the area of ​​the outlet 10 is the area of ​​the opening 80 of the installed nozzle 8, which, as described above, is within a range of an area of ​​a circle with a diameter of 6 mm or more and an area of ​​a circle with a diameter of 15 mm or less (from 9π mm). 2 up to 56.25πmm 2 The selection is made within a certain range. Furthermore, this range is a reasonable range that allows for the area of ​​the outlet 10 in either the first or second mode to be achieved while suppressing the possibility of surge.

[0098] The blower 1 is configured to operate in either a first mode or a second mode, depending on the area of ​​the outlet 10. The first mode prioritizes airflow over air pressure, and operates when the maximum airflow force of the air discharged from the outlet 10 is in the range of 3.0 Newtons (N) to 4.0 N when the motor 33 is driven at its highest speed. Furthermore, this airflow force value is measured according to the "ANSI B175.2 standard" specified by the American National Standards Institute (ANSI). The second mode prioritizes air pressure over airflow force, and operates when the maximum dynamic pressure of the air discharged from the outlet 10 is in the range of 35 kPa to 50 kPa when the motor 33 is driven at its highest speed.

[0099] In this embodiment, when the area of ​​the outlet 10 is within the range of a circle with a diameter of 12 mm or more but less than the area of ​​a circle with a diameter of 15 mm (when the nozzle diameter is in the range of 12 mm to 15 mm), the blower 1 operates in the first mode. For example, when the nozzle 8 is not installed and the opening 230 of the nozzle portion 23 of the main body 20 functions as the outlet 10 (i.e., the area of ​​the outlet 10 is the area of ​​a circle with a diameter of 13 mm (169 mm)... 2 In the case of ), when the motor 33 is being driven at its maximum speed of 80,000 rpm, the maximum wind force of the exhaust air is approximately 3.2 N.

[0100] On the other hand, when the area of ​​the outlet 10 is within the range of a circle with a diameter of 6 mm or more but less than the area of ​​a circle with a diameter of 8 mm (when the nozzle diameter is in the range of 6 mm to 8 mm), the blower 1 operates in the second mode. For example, when a nozzle 8 with a nozzle diameter of 7 mm is installed (that is, the area of ​​the outlet 10 is the area of ​​a circle with a diameter of 7 mm (49π mm)... 2 In the case of driving the motor 33 at its maximum speed of 80,000 rpm, the maximum dynamic pressure of the exhaust air is approximately 42 kPa.

[0101] According to the dust blower 1 of this embodiment, the user can change the area of ​​the outlet 10 by removing or replacing the nozzle 8 according to the work requirements, thereby improving the convenience of operation. Specifically, for example, if the user wants to blow away objects with a relatively strong airflow like a general blower, the user can install or remove the nozzle 8 from the main body 20 in the range of 12mm to 15mm to operate the dust blower 1 in the first mode. On the other hand, for example, if the user wants to concentrate the blowing of high-pressure air within a specific, very narrow area, such as when removing dust that is blocked in a filter, the user can install the nozzle 8 in the range of 6mm to 8mm on the main body 20 to operate the dust blower 1 in the second mode.

[0102] Furthermore, in this embodiment, the user can change the rotational speed of the motor shaft 335 by manually operating the operating unit 292 and the trigger 281 respectively. Specifically, the user can select a rotational speed from four options (more specifically, a speed used as a reference for calculating the actual rotational speed) by pressing the operating unit 292 (push-button switch). Additionally, the user can further change the rotational speed by changing the amount of pressure applied to the trigger 281. Therefore, in either Mode 1 or Mode 2, the user can manually operate the operating unit 292 and the trigger 281 according to the work requirements, thereby adjusting the airflow of the exhausted air.

[0103] The following shows the correspondence between the structural elements (features) of the above embodiments and the structural elements (features) of this application or invention. However, the structural elements of the embodiments are merely examples and do not limit the structural elements of this application or invention.

[0104] Dust blower 1 is an example of a "blowing fan". Outlet 10 (opening 230 or opening 80) is an example of an "outlet". Main body 20 is an example of a "main body". Motor 33, motor main body 330, stator 331, rotor 333, and motor shaft 335 are examples of "motor", "motor main body", "stator", "rotor", and "motor shaft", respectively. Fan 35 is an example of a "fan". Nozzle 8 is an example of a "nozzle". Circuit board 38 is an example of a "circuit board". Housing 31 is an example of a "housing". Motor assembly 3 is an example of a "motor assembly". Trigger 281 is an example of a "trigger".

[0105] Furthermore, the above embodiments are merely examples, and the blower involved in this invention is not limited to the dust blower 1 of the examples. For example, modifications as exemplified below can be added. In addition, at least one of these modifications can be used in combination with the dust blower 1 exemplified in the embodiments and at least one of the features described in each technical solution.

[0106] For example, the values ​​of the various elements of the blower 1 exemplified in the above embodiment (maximum rotational speed of the motor shaft 335, maximum airflow in mode 1, maximum dynamic pressure in mode 2, diameter of the fan 35, etc.) are merely examples, and different values ​​may be used. Below, examples of possible modifications to the various elements of the blower 1 are shown.

[0107] The maximum speed of the motor shaft 335 does not need to be 80,000 rpm; for example, it can be in the range of 50,000 rpm to 120,000 rpm, and more preferably in the range of 70,000 rpm to 90,000 rpm. Within this range, even for a single fan 35 with a relatively small diameter, it is easy to achieve the wind power to blow away larger objects (e.g., wood chips, paper scraps, etc.) in the first mode, in addition to blowing away dust and dirt.

[0108] In Mode 1, the maximum wind force can be in the range of 2.5 N to 5.0 N. Within this range, larger objects can be dispersed, in addition to dust and particulate matter. On the other hand, in Mode 2, the maximum dynamic pressure can be in the range of 30 kPa to 65 kPa. Within this range, smaller objects can be reliably dispersed by high pressure.

[0109] The diameter of the fan 35 does not need to be 43mm, but from the perspective of balancing the miniaturization of the blower 1 in the radial direction and ensuring the airflow, it is preferably in the range of 40mm to 45mm.

[0110] Furthermore, in the above embodiment, the area of ​​the outlet 10 can be changed by removing or replacing the nozzle 8, but it can also be changed simply by replacing the nozzle 8. That is, the blower 1 can be used with the nozzle 8 mounted on the main body 20. Moreover, the nozzle 8 and the main body 20 can be connected by any other method, not the locking mechanism 235 of the example. For example, they can be connected by threading an internal thread provided at the base end of the nozzle 8 with an external thread provided on the main body 20. Alternatively, the same connection structure as that used for the air intake side cover 25 and filter mounting part 241 in the above embodiment can be employed.

[0111] For example, the area of ​​the outlet 10 can be changed by covering at least a portion of the opening 230 (outlet 10) of the main body 20. For example, the blower 1 may also have a cover (shield) that can move linearly or rotate in response to manual operation by the user, thereby opening or closing at least a portion of the opening 230 (outlet 10). In addition, the shape of the outlet 10 does not need to be circular, and can be appropriately changed to ellipse, polygon, star, etc.

[0112] The structure (shape, constituent parts, and connection method between constituent parts) of the main body 20 and the handle 27 is not limited to the example of the above embodiment and can be appropriately modified.

[0113] For example, the main body 20 may be formed solely of the cylindrical outer shell 21 (and the fixing member 215). That is, the main body 20 may be formed solely of a single outer shell member. In addition, the cylindrical outer shell 21 may be formed by connecting two split bodies that are divided in a direction orthogonal to the axis of rotation A1 to each other, or by connecting multiple parts that are divided in the front-back direction together.

[0114] The intake side cover 25 may also be substantially non-removable from the outer housing 24 (filter mounting portion 241). Alternatively, the intake side cover 25 may be detachably threaded onto the outer housing 24, for example, it may be detachably connected to the outer housing 24 by a separate screw. The size, shape, number, and arrangement of the air intake 250 can be suitably changed according to the examples of the above embodiments.

[0115] It is not necessary to form a portion of the main body 20 and the handle 27 as integrally as the outer housing 24 in the above embodiment. Alternatively, instead of the handle 27, a portion of the main body 20 may have a grip for the user to hold.

[0116] The motor 33 may not be a brushless motor, but rather a brushed motor. Furthermore, the motor assembly 3 does not necessarily need to be supported on the main body 20 (cylindrical housing 21) by an elastic body; for example, it can be positioned and supported by multiple ribs provided within the cylindrical housing 21. Moreover, the motor 33 does not need to be part of the assembly along with the housing 31, bearing 32, fan 35, etc., and the support structure of the motor 33 can be appropriately modified. For example, the housing 31 housing the motor main body 330 can be omitted, and the motor shaft 335 can be rotatably supported by bearings supported on the main body 20.

[0117] In the above embodiments, the rotational speed of the motor shaft 335 can be steplessly changed according to the amount of operation of the trigger 281, but it may also not be able to be changed by the rotational speed selected by the operation unit 292. Alternatively, the rotational speed of the motor shaft 335 may be changed only by pressing the trigger 281, or it may not be able to be changed by pressing the trigger 281 alone. In addition, the operation unit 292 may not have a push-button switch, but may have, for example, a dial, a touch screen, etc. The controller 291 may not be composed of a microcomputer, but may be composed of other types of control circuits.

[0118] The fan 35 may be fixed to the air inlet 250 side, or it may be fixed to the motor shaft 335 on the outlet 10 side, instead of being fixed to the motor body 330. Furthermore, the fan 35 is preferably a centrifugal fan (especially a backward-curved blade fan, also known as a turbofan), but a mixed-flow fan may also be used, for example.

[0119] At least one of the first filter 41 and the second filter 42 may be omitted. Furthermore, when only one filter is provided, it is preferable that the filter can be removed from the main body 20.

[0120] The power source for the blower 1 is not limited to a rechargeable battery 295; it can also be a disposable battery or an external AC power source. Alternatively, a rechargeable battery can be built into the blower 1.

[0121] Furthermore, the following configuration is constructed according to the spirit of the present invention, the above-described embodiments, and their variations. At least one of the following configurations can be used in combination with the above-described embodiments and their variations, as well as at least one of the inventions described in each technical solution.

[0122] [Method A1]

[0123] The area of ​​the outlet can be changed not only by replacing the nozzle, but also by removing and installing the nozzle relative to the main body.

[0124] [Method A2]

[0125] The outlet is located on the main body or is detachably connected to the nozzle of the main body.

[0126] [Method A3]

[0127] The main body has a first opening.

[0128] The main body is configured to selectively detach and assemble a nozzle having a second opening at its tip, such that the first opening and the second opening are connected.

[0129] When no nozzle is installed on the main body, the outlet is defined by the first opening; when a nozzle is installed on the main body, the outlet is defined by the second opening.

[0130] The opening 230 of the nozzle mounting part 231 is an example of "first opening". The opening 80 of the nozzle 8 is an example of "second opening".

[0131] [Method A4]

[0132] The air supply mechanism operates in the first mode when the area of ​​the outlet is within a first range, and in the second mode when the area of ​​the outlet is within a second range.

[0133] The upper limit of the second range is less than the lower limit of the first range.

[0134] [Method A5]

[0135] The blower also has:

[0136] The operating unit allows the user to manually set the rotational speed of the motor shaft; and

[0137] A control device configured to control the rotational speed of the motor shaft in response to operation of the operating unit.

[0138] Operation unit 292 is one example of an "operation unit". Trigger 281 is another example of an "operation unit".

[0139] Furthermore, with the aim of providing a technology that helps suppress the reduction of air delivery efficiency in the blower, the following methods B1 to B19 are constructed. Any one of the following methods B1 to B19 may be used alone, or a combination of two or more of the following methods B1 to B19 may be used. Alternatively, at least one of the following methods B1 to B19 may be used in combination with the dust blower 1 of the embodiment, the above-described modifications, methods A1 to A5, and at least one feature described in each technical solution.

[0140] [Method B1]

[0141] A blower, characterized in that it has:

[0142] The main body has an air inlet and an exhaust outlet;

[0143] The motor assembly, which is housed within the main body; and

[0144] A sealing component is disposed between the body and the motor assembly.

[0145] The motor assembly includes:

[0146] A housing having a first opening and a second opening;

[0147] An electric motor includes: a stator supported within the housing; a rotor; and a motor shaft capable of rotating integrally with the rotor about an axis of rotation defining the forward and backward direction of the blower.

[0148] A fan, which is fixed to the motor shaft and is capable of rotating integrally with the motor shaft; and

[0149] At least one bearing, supported in the housing, rotatably supports the motor shaft.

[0150] The sealing component is configured to isolate the space formed between the main body and the motor assembly from the first space and the second space, wherein the first space is connected to the air inlet and the first opening; and the second space is connected to the second opening and the outlet.

[0151] In this type of blower, the housing, motor, fan, and at least one bearing constitute an integrated motor assembly. Therefore, the motor assembly is easily assembled into the main body. Furthermore, a sealing component is disposed between the main body and the motor assembly, isolating the internal space of the main body from a first space and a second space, wherein the first space is connected to an air inlet and a first opening; and the second space is connected to a second opening and an outlet. Therefore, the sealing component prevents air flowing from the second opening of the housing into the second space from flowing into the first space. Accordingly, a decrease in air supply efficiency can be suppressed.

[0152] [Method B2]

[0153] The blower according to method B1 is characterized in that...

[0154] The outlet is configured to be located in front of the motor assembly in the front-rear direction, discharging air forward.

[0155] According to this method, compared to the case where the exhaust port is positioned overlapping with the motor assembly in the front-to-back direction, a more radially compact blower can be achieved. Furthermore, air flowing from the motor assembly to the exhaust port can be effectively discharged forward from the exhaust port.

[0156] [Method B3]

[0157] The blower according to method B2 is characterized in that...

[0158] It also has a handle that protrudes from the body and extends in a direction intersecting the axis of rotation of the motor shaft.

[0159] The air inlet is configured to be located behind the motor assembly in the front-rear direction, allowing air to flow forward.

[0160] According to this method, the air inlet and outlet are located behind and in front of the motor assembly, respectively. Furthermore, the airflow direction (inlet direction) from the air inlet and the airflow direction (outlet direction) from the outlet are the same. Therefore, an effective airflow is generated from the air inlet through the motor assembly to the outlet. On the other hand, the handle extends from the main body in a direction intersecting the rotation axis of the motor shaft. This results in a blower that is easy for the user to operate by gripping the handle.

[0161] [Method B4]

[0162] The blower according to method B3 is characterized in that...

[0163] When viewed in a direction orthogonal to the axis of rotation of the motor shaft, the air inlet, the motor assembly, and the outlet are arranged in a straight line.

[0164] According to this method, an effective airflow is generated from the air inlet through the motor assembly to the outlet.

[0165] [Method B5]

[0166] The blower according to any one of methods B1 to B4 is characterized in that...

[0167] It also has at least one filter, which is disposed between the air inlet and the first opening.

[0168] According to this method, the possibility of foreign objects (e.g., dust) entering the motor assembly can be effectively reduced.

[0169] [Method B6]

[0170] The blower according to any one of methods B1 to B5 is characterized in that...

[0171] The sealing component is at least partially disposed radially between the inner surface of the body and the outer surface of the housing, blocking the gap between the inner surface of the body and the outer surface of the housing.

[0172] According to this method, the first space and the second space can be reliably isolated by a sealing component.

[0173] [Method B7]

[0174] The blower according to any one of methods B1 to B6 is characterized in that...

[0175] The main body and the motor assembly are connected together in a relatively movable manner by at least one elastic body located between the main body and the motor assembly.

[0176] According to this method, the transmission of vibration from the motor assembly to the main body can be reduced.

[0177] [Method B8]

[0178] The blower according to method B7 is characterized in that...

[0179] The sealing component also serves as the at least one elastomer.

[0180] According to this method, the sealing component that isolates the first space and the second space can be used reasonably and effectively without increasing the number of parts and adding the function of reducing the transmission of vibration from the motor assembly to the main body.

[0181] [Method B9]

[0182] The blower according to method B8 is characterized in that...

[0183] The at least one elastomer includes: a first elastomer located between the rear end of the motor assembly and the body; and a second elastomer located between the front end of the motor assembly and the body.

[0184] The sealing component also serves as the first elastomer.

[0185] According to this method, vibrations transmitted from the motor assembly to the main body can be more effectively reduced by elastically connecting multiple elastomers.

[0186] [Method B10]

[0187] The blower according to method B9 is characterized in that...

[0188] The second elastic body is configured to restrict the relative rotation of the motor assembly and the main body in the circumferential direction about the rotation axis of the motor shaft.

[0189] According to this method, a second elastic body can be used to hold the motor assembly in a suitable position relative to the main body in the circumferential direction.

[0190] [Method B11]

[0191] The first opening is formed at the rear end of the housing.

[0192] The second opening is formed at the front end of the housing.

[0193] [Method B12]

[0194] The rotation axis of the motor shaft intersects with the first opening and the second opening (extending through the first opening and the second opening).

[0195] [Method B13]

[0196] The air inlet is located at the rear end of the main body.

[0197] The outlet is located at the front end of the main body.

[0198] [Method B14]

[0199] The fan is configured to generate an airflow that is drawn in through the air inlet and discharged from the outlet by the motor.

[0200] [Method B15]

[0201] The at least one filter is configured within the first space.

[0202] [Method B16]

[0203] The at least one filter is detachably mounted to the body.

[0204] [Method B17]

[0205] The at least one filter includes a first filter and a second filter with a mesh size sparser than the first filter.

[0206] [Method B18]

[0207] The first filter is detachably installed on the main body.

[0208] The second filter is disposed between the first filter and the motor and is installed on the body in a manner that makes it substantially non-removable from the body.

[0209] [Method B19]

[0210] The sealing component is a single component formed in a cylindrical shape.

[0211] The following shows the correspondence between the structural elements (features) of embodiments B1 to B19 and the structural elements (features) of the present invention. However, each structural element in the embodiment is merely an example, and the structural elements of embodiments B1 to B19 are not limited.

[0212] The blower 1 is an example of a "blower". The main body 20 is an example of a "main body". The air inlet 250 is an example of an "air inlet". The opening 230 of the main body 20 is an example of an "exhaust outlet". The motor assembly 3 is an example of a "motor assembly". The sealing ring 39 is an example of a "sealing component". The housing 31, the first opening 316, and the second opening 312 are examples of "housing", "first opening", and "second opening", respectively. The motor 33, stator 331, rotor 333, and motor shaft 335 are examples of "motor", "stator", "rotor", and "motor shaft", respectively. The fan 35 is an example of a "fan". The bearing 32 is an example of a "bearing". The first space 205 and the second space 206 are examples of "first space" and "second space", respectively. The handle 27 is an example of a "handle". The first filter 41 and the second filter 42 are examples of "filters". The sealing ring 39 and the elastic cover 373 are examples of "elastic bodies". The sealing ring 39 is an example of a "first elastic body". The elastic cover 373 is an example of a "second elastic body".

[0213] Furthermore, the above embodiments are merely examples, and the blowers involved in methods B1 to B19 are not limited to the dust blower 1 of the examples. For example, the modifications exemplified below can be added. In addition, at least one of these modifications can be used in combination with at least one feature of the dust blower 1 of the embodiments, the above-described modifications, methods, and features described in each technical solution.

[0214] For example, the values ​​of the various elements of the blower 1 in the above embodiment example (maximum speed of motor shaft 335, maximum air force in mode 1, maximum dynamic pressure in mode 2, area of ​​outlet 10, diameter of fan 35, etc.) are merely examples, and any values ​​may be used.

[0215] The structure (shape, constituent parts, and connection method between constituent parts) of the main body 20 and the handle 27 is not limited to the example of the above embodiment and can be appropriately modified.

[0216] For example, the main body 20 may be formed solely of the cylindrical outer shell 21 (and the fixing member 215). That is, the main body 20 may be formed solely of a single outer shell member. Furthermore, the cylindrical outer shell 21 may be formed by connecting two split sections that are orthogonal to the axis of rotation A1 to each other, or by connecting multiple sections that are split in the front-rear direction. The intake side shield 25 may also be substantially non-removable from the outer shell 24 (filter mounting portion 241). Alternatively, the intake side shield 25 may be detachably threaded onto the outer shell 24, for example, it may be detachably connected to the outer shell 24 by a single screw. The size, shape, number, and arrangement of the air inlets 250 can be suitably changed according to the examples of the above embodiments.

[0217] It is not necessary to form a portion of the main body 20 and the handle 27 as integrally as the outer housing 24 in the above embodiment. Alternatively, instead of the handle 27, a portion of the main body 20 may have a grip for the user to hold.

[0218] The structure of the motor assembly 3 can be suitably modified. The motor 33 may also be a brushed motor instead of a brushless motor. The fan 35, located within the housing 31, may not be fixed to the air inlet 250 side relative to the motor body 330, but rather fixed to the motor shaft 335 on the outlet 10 side. Furthermore, the fan 35 is preferably a centrifugal fan (especially a backward-curved blade fan, also called a turbofan), for example, a diagonal flow fan may also be used. The configuration of the first opening 316 and the second opening 312 in the housing 31 can also be suitably changed according to modifications related to the fan 35 or unrelated to such modifications. Additionally, the support member 37 may be omitted from the motor assembly 3, and the circuit board 38 may be positioned differently from the example of the above embodiment.

[0219] Furthermore, the motor assembly 3 does not necessarily need to be connected to the main body 20 (cylindrical housing 21) via the sealing ring 39 and the elastic cover 373. For example, the motor assembly 3 can also be supported by the sealing ring 39 and multiple ribs disposed within the cylindrical housing 21. Alternatively, the motor assembly 3 can be supported solely by the multiple ribs disposed within the cylindrical housing 21. In this case, the sealing ring 39 only needs to have an isolation function, which refers to isolating the first space 205 and the second space 206, wherein the first space 205 communicates with the air inlet 250 and the first opening 316 of the housing 31, and the second space 206 communicates with the second opening 312 of the housing 31 and the outlet 10. Therefore, for example, instead of a single cylindrical sealing ring 39, one or more elastomers can be disposed between the main body 20 and the housing 31 to perform this function. Furthermore, the one or more elastomers are preferably formed of rubber or an elastomer.

[0220] At least one of the first filter 41 and the second filter 42 may be omitted. Furthermore, in the case of providing only one filter, it is preferable that the filter can be removed from the main body 20.

[0221] The power source for the blower 1 is not limited to a rechargeable battery 295; it can also be a disposable battery or an external AC power source. Alternatively, a rechargeable battery can be built into the blower 1.

[0222] Furthermore, with the aim of providing technology that helps to effectively protect the motor in the blower, the following methods C1 to C9 are constructed. Any one of the following methods C1 to C9 may be used alone, or a combination of two or more of the following methods C1 to C9 may be used. Alternatively, at least one of the following methods C1 to C9 may be used in combination with the dust blower 1 of the embodiment, the above-described modifications, methods A1 to A5, B1 to B19, and at least one feature described in each technical solution.

[0223] [Method C1]

[0224] A blower, comprising:

[0225] The main body has an air inlet and an exhaust outlet;

[0226] The motor is housed within the main body;

[0227] A fan, housed within the main body, is configured to rotate in response to the drive of the motor, thereby generating an airflow that is drawn in through the air inlet, passes through the motor, and is discharged from the outlet; and

[0228] At least one filter is disposed within the body between the air inlet and the motor.

[0229] In this type of blower, air is drawn in through the inlet as the fan rotates, passes through the motor, and reaches the outlet. A filter between the inlet and the motor captures foreign objects (e.g., dust) that flow into the main body along with the air, thus helping to protect the motor.

[0230] [Method C2]

[0231] The blower according to method C1 is characterized in that...

[0232] The at least one filter is detachably mounted to the body.

[0233] This method allows the filter to be removed from the main body for cleaning or replacement, thus improving convenience.

[0234] [Method C3]

[0235] The blower according to method C2 is characterized in that...

[0236] The subject has:

[0237] A filter mounting section having an opening for removably mounting the at least one filter; and

[0238] A cover that removably covers the opening.

[0239] The at least one filter can be installed or removed from the filter mounting portion through the opening.

[0240] According to this method, the user can easily install or remove at least one filter by removing the cover from the opening of the filter mounting part.

[0241] [Method C4]

[0242] The blower according to any one of methods C1 to C3 is characterized in that...

[0243] The at least one filter includes a first filter and a second filter with a mesh size sparser than the first filter.

[0244] Furthermore, the term "sparse mesh" can also be described as "allowing larger foreign objects (e.g., particles with larger diameters) to pass through." According to this method, foreign objects can be captured more reliably in two stages using two filters. Additionally, even if one of the two filters is removed, the other filter can still capture foreign objects.

[0245] [Method C5]

[0246] The blower according to method C4 is characterized in that...

[0247] The first filter and the second filter are detachably mounted to the main body.

[0248] The second filter is configured between the first filter and the motor in a state where its movement in the direction away from the main body is restricted compared to the first filter.

[0249] In this method, the first filter, which can be easily removed for cleaning or replacement even if clogged with foreign objects, uses a filter with higher foreign object capture performance (denser mesh). The second filter, which is not as easy to remove as the first filter (i.e., not easy to clean or replace), uses a filter that is less prone to foreign object clogging (sparser mesh). Therefore, according to this method, a reasonable structure capable of capturing foreign objects in two stages is achieved.

[0250] [Method C6]

[0251] The blower according to any one of methods C1 to C5 is characterized in that...

[0252] The at least one filter is formed by an open-cell bubble structure.

[0253] According to this method, a filter can be created that can effectively capture foreign objects while suppressing the reduction of wind force.

[0254] [Method C7]

[0255] The blower according to any one of methods C1 to C6 is characterized in that...

[0256] The at least one filter is a HEPA filter, a powder filter, or a non-woven filter.

[0257] According to this method, a filter that can effectively capture foreign objects can be realized.

[0258] [Method C8]

[0259] The blower according to any one of methods C1 to C7 is characterized in that...

[0260] The airflow generated by the fan passes sequentially through the air inlet, the at least one filter, the fan, the motor, and the outlet along the extension direction of the fan's rotation axis.

[0261] According to this method, an effective airflow is generated from the air inlet to the air outlet.

[0262] [Method C9]

[0263] The blower according to any of the methods C1 to C8

[0264] It also has a limiting component, which is at least partially disposed between the first filter and the second filter, limiting the movement of the second filter toward the opening of the filter mounting portion.

[0265] The following shows the correspondence between the structural elements (features) of embodiments C1 to C9 and the structural elements (features) of the present invention. However, the structural elements of the embodiments are merely examples and do not limit the structural elements of embodiments C1 to C9.

[0266] The blower 1 is an example of a "blower". The main body 20 is an example of a "main body". The air inlet 250 is an example of an "air inlet". The opening 230 of the main body 20 is an example of an "exhaust outlet". The motor 33 is an example of a "motor". The fan 35 is an example of a "fan". The first filter 41 and the second filter 42 are examples of "filters". Alternatively, the first filter 41 and the second filter 42 are examples of "first filter" and "second filter" respectively. The filter mounting part 241 and the opening 240 are examples of "filter mounting part" and "opening" respectively. The air inlet side cover 25 is an example of a "cover". The filter holder 45 is an example of a "restricting component" in this embodiment.

[0267] Furthermore, the above embodiments are merely examples, and the blower involved in methods C1 to C9 is not limited to the dust blower 1 described in the examples. For example, the following modifications can be added. In addition, at least one of these modifications can be used in combination with at least one feature of the dust blower 1 of the embodiments, the above-described modifications, methods, and features described in each technical solution.

[0268] For example, the values ​​of the various elements of the blower 1 exemplified in the above embodiment (maximum speed of motor shaft 335, maximum air force in mode 1, maximum dynamic pressure in mode 2, area of ​​outlet 10, diameter of fan 35, etc.) are merely examples, and any values ​​may be used.

[0269] The structure (shape, constituent parts, and connection method between constituent parts) of the main body 20 and the handle 27 is not limited to the example of the above embodiment and can be appropriately modified.

[0270] For example, the main body 20 may be formed solely of the cylindrical outer shell 21 (and the fixing member 215). That is, the main body 20 may be formed from a single outer shell member. Furthermore, the cylindrical outer shell 21 may be formed by connecting two split sections that are orthogonal to the axis of rotation A1 to each other, or by connecting multiple sections that are split in the front-rear direction. The air intake side cover 25 may be detachably threaded onto the outer shell 24, for example, it may also be detachably connected to the outer shell 24 by a single screw. The size, shape, number, and arrangement of the air intake 250 may also be suitably varied according to the examples of the above embodiments.

[0271] It is not necessary to integrally form a portion of the main body 20 with the handle 27 as in the outer housing 24 of the above embodiment. Alternatively, instead of the handle 27, a portion of the main body 20 may have a grip portion for the user to hold.

[0272] The motor 33 may not be a brushless motor, but rather a brushed motor. Furthermore, the motor assembly 3 does not necessarily need to be supported on the main body 20 (cylindrical housing 21) by an elastomer; for example, it can be positioned and supported by multiple ribs provided within the cylindrical housing 21. Moreover, the motor 33 does not need to be part of the assembly along with the housing 31, bearing 32, fan 35, etc., and the support structure of the motor 33 can be appropriately modified. For example, the housing 31 housing the motor main body 330 can be omitted, and the motor shaft 335 can be rotatably supported by bearings on the main body 20.

[0273] The fan 35 may be fixed to the air inlet 250 side, or it may be fixed to the motor shaft 335 on the outlet 10 side, instead of being fixed to the motor body 330. Furthermore, the fan 35 is preferably a centrifugal fan (especially a backward-curved blade fan, also known as a turbofan), but a mixed-flow fan may also be used, for example.

[0274] The structure, configuration, and retaining mechanism of the first filter 41 and the second filter 42 can also be suitably modified. For example, the filter holder 45 can be omitted, and both the first filter 41 and the second filter 42 can be easily removed from the main body 20. In this case, for example, the rear-side (closer to the air inlet 250) first filter 41 uses a filter with a sparser mesh than the front-side (closer to the motor 33) second filter 42. In this case, the second filter 42 can capture smaller foreign objects that the first filter 41 cannot completely capture. Alternatively, the mesh density of the first filter 41 and the second filter 42 can also be substantially the same.

[0275] At least one of the first filter 41 and the second filter 42 may be omitted. Furthermore, when only one filter is provided, it is preferable that the filter be detachable from the main body 20. Alternatively, the filter may be detachably installed in the housing 31, for example, by covering the first opening 316 of the housing 31 of the motor assembly 3.

[0276] The power source for the blower 1 is not limited to a rechargeable battery 295; it can also be a disposable battery or an external AC power source. Alternatively, a rechargeable battery can be built into the blower 1.

Claims

1. A blower, wherein the blower mechanism is configured to discharge air from an outlet, characterized in that, have: main body; An electric motor is housed within the main body, comprising a motor body portion and a motor shaft, the motor body portion including a stator and a rotor; the motor shaft is rotatable integrally with the rotor; A single fan, housed within the main body, is configured to rotate in response to the rotation of the motor shaft, discharging air from the exhaust port; and there is only one such fan. The maximum speed of the motor shaft is in the range of 50,000 rpm to 120,000 rpm. The main body is configured to be able to detach and assemble one type of nozzle selected from a variety of nozzles with different opening areas at the top. The area of ​​the discharge port can be changed within a range of a circle with a diameter of 6 mm and a diameter of 15 mm by the user disassembling or replacing the nozzle relative to the main body. The air supply mechanism is configured to selectively operate in either a first mode or a second mode, depending on the area of ​​the outlet. The first mode refers to a mode where, when the motor is driven at the highest speed, the maximum airflow force discharged from the outlet is in the range of 2.5 N to 5.0 N. The second mode refers to a mode where, when the motor is driven at the highest speed, the maximum dynamic pressure of the air discharged from the outlet is in the range of 30 kPa to 65 kPa. It also includes a circuit board that is electrically connected to the main body of the motor. The fan is located axially on the motor shaft between the air inlet formed on the main body and the motor main body. The circuit board is located axially on the motor shaft between the motor body and the outlet.

2. The blower according to claim 1, characterized in that, The diameter of the fan is in the range of 40mm to 45mm.

3. The blower according to claim 1 or 2, characterized in that, The maximum speed of the motor shaft is in the range of 70,000 rpm to 90,000 rpm. The maximum wind force in the first mode is in the range of 3.0N to 4.0N. The maximum dynamic pressure of the second mode is in the range of 35 kPa to 50 kPa.

4. The blower according to claim 3, characterized in that, The air supply mechanism operates in the first mode when the area of ​​the outlet is greater than or equal to the area of ​​a circle with a diameter of 12 mm and less than or equal to the area of ​​a circle with a diameter of 15 mm, and operates in the second mode when the area of ​​the outlet is greater than or equal to the area of ​​a circle with a diameter of 6 mm and less than or equal to the area of ​​a circle with a diameter of 8 mm.

5. The blower according to claim 1, characterized in that, The motor and the fan are housed in a housing, forming an integral motor assembly together with the housing and the circuit board. The circuit board is disposed between the housing and the outlet. A space is provided between the motor assembly and the inner surface of the main body in the radial direction of the motor.

6. The blower according to claim 1 or 2, characterized in that, The rotational speed of the motor shaft can be changed.

7. The blower according to claim 6, characterized in that, It also features a trigger that can be pressed by the user. The rotational speed of the motor shaft changes according to the amount of trigger operation.

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