US20180094393A1 - Backpack-type air blowing working machine - Google Patents

Backpack-type air blowing working machine Download PDF

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Publication number
US20180094393A1
US20180094393A1 US15/566,340 US201615566340A US2018094393A1 US 20180094393 A1 US20180094393 A1 US 20180094393A1 US 201615566340 A US201615566340 A US 201615566340A US 2018094393 A1 US2018094393 A1 US 2018094393A1
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US
United States
Prior art keywords
backpack
working machine
type air
blowing
blowing working
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US15/566,340
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English (en)
Inventor
Makoto Takahashi
Tadasuke MATSUNO
Tsuyoshi Tanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Makita Corp
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Makita Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2015086173A external-priority patent/JP2016204930A/ja
Priority claimed from JP2015086176A external-priority patent/JP6621594B2/ja
Priority claimed from JP2015086171A external-priority patent/JP6532271B2/ja
Application filed by Makita Corp filed Critical Makita Corp
Assigned to MAKITA CORPORATION reassignment MAKITA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Matsuno, Tadasuke, TAKAHASHI, MAKOTO, TANAKA, TSUYOSHI
Publication of US20180094393A1 publication Critical patent/US20180094393A1/en
Abandoned legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
    • E01H1/08—Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
    • E01H1/0809—Loosening or dislodging by blowing ; Drying by means of gas streams
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G20/00—Cultivation of turf, lawn or the like; Apparatus or methods therefor
    • A01G20/40—Apparatus for cleaning the lawn or grass surface
    • A01G20/43—Apparatus for cleaning the lawn or grass surface for sweeping, collecting or disintegrating lawn debris
    • A01G20/47—Vacuum or blower devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0673—Battery powered
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation

Definitions

  • the present invention relates to a backpack-type air-blowing working machine for use in cleaning small pieces such as fallen leaves or mown grass, and more particularly to a backpack-type air-blowing working machine in which a volute casing incorporating a centrifugal fan configured to be driven by an electric motor is assembled to a backpack frame.
  • U.S. Pat. No. 6,006,400 discloses a backpack blower which comprises: a volute casing mounted to a cross-sectionally L-shaped backpack frame to be carried on the back of an operator (i.e., a user or a worker); a centrifugal fan rotatably pivoted within the volute casing; an electric motor assembled to a rear side of the volute casing and operable to rotate the centrifugal fan, and a battery attached to a lower horizontal frame portion of the backpack frame.
  • This backpack blower is configured such that the centrifugal fan in the volute casing is rotated by the electric motor operated by electric power fed from the battery, and air sucked into the volute casing according to the rotation of the centrifugal fan is blown out from a blowout port of the volute casing.
  • the large-size electric motor is disposed behind the volute casing, and attached to a longitudinally intermediate region of the lower horizontal frame portion of the backpack frame. Therefore, an operator carries the backpack frame of backpack blower on his/her back using shoulder straps during use, a position of the center of gravity of the backpack blower will lie relatively rearward y, so that the operator is likely to fall down rearwardly, leading to difficulty in cleaning work.
  • the battery for feeding electric power to the electric motor is fixed to the lower horizontal frame portion of the backpack frame by a screw through a bracket.
  • the backpack blower is not designed supposing that the battery is frequently detached and charged. Therefore, for charging the battery, it is necessary to carry the backpack blower to a vicinity of a power supply, or to detach the bracket for each charging operation. Thus, it is necessary to take time and effort for the battery charging operation.
  • a backpack-type air-blowing working machine which comprises: a backpack frame having at least a back plate portion conformable to the back of an operator, wherein the backpack frame is configured to be carried on the back of the operator through the back plate portion using shoulder straps; a volute casing mounted to the backpack frame at a position rearward of the back plate portion, in such a manner that a center of a volute is set in a direction intersecting a planar direction of the back plate portion; a centrifugal fan rotatably supported within the volute casing; an electric motor assembled to the volute casing and operable to rotate the centrifugal fan; and a rechargeable battery pack attached to the backpack frame and operable to feed electric power to the electric motor, wherein the backpack-type air-blowing working machine is configured such that a position of the center of gravity of the backpack-
  • the position of the center of gravity of the backpack-type air-blowing working machine as viewed from the rear thereof is located below the rotation axis of the centrifugal fan, and the position of the center of gravity of the backpack-type air-blowing working machine as viewed from the side thereof is located forward of the rear end of the volute casing
  • a weight of the backpack-type air-blowing working machine is supported by the lumbar region of the operator, and therefore the backpack-type air-blowing working machine is stabilized, so that the operator becomes less likely to fall down rearwardly, thereby making it possible to more easily manipulate the air-blowing working machine to reduce fatigue of the operator.
  • the battery pack is disassemblably assembled onto a support rack portion provided to extend rearwardly and horizontally from a lower end of the back plate portion of the backpack frame and located just beneath the volute casing.
  • the battery pack may be composed of a plurality of rechargeable battery packs.
  • Each of the plurality of rechargeable battery packs is connected to the electric motor, and each of the plurality of rechargeable battery packs is assembled in a manner that allows for disassembly of the respective battery pack from the electric motor. In this case, it becomes possible to enhance convenience of the backpack-type air-blowing working machine using a battery pack standardly utilized in various electric tools and electric gardening machines.
  • the backpack-type air-blowing working machine is preferably configured such that, when it is placed on a horizontal mounting surface such that the back plate portion is in a standing posture, the back plate portion is kept in the standing posture, in both of a state in which the battery pack is attached to the support rack portion of the backpack frame and a state after the battery pack is detached from the support rack portion.
  • the backpack-type air-blowing working machine there is no need to support the backpack-type air-blowing working machine by hand to maintain standing posture, before and after attachment of the battery pack, so that it becomes possible to facilitate the detaching and attaching operations for charging the battery pack.
  • the volute casing is configured such that one of opposite ends thereof in a rightward-leftward direction has a blowing tube portion formed to blow out air therefrom and communicated with and connected to a blowing duct, and the other end thereof in the rightward-left direction has a joint with respect to the battery pack.
  • the blowing duct is disposed on the one end of the volute casing in the rightward-leftward direction
  • the battery pack is disposed on the other end of the volute casing in the rightward-leftward direction, so that it becomes possible to provide good weight balance in the rightward-leftward direction during use of the backpack-type air-blowing working machine.
  • the backpack-type air-blowing working machine is configured such that the position of the center of gravity of the backpack-type air-blowing working machine as viewed from the rear thereof is located within a region extending from a center line of the backpack frame in each of a rightward direction and a leftward direction, by a length of 10% of a maximum width of the backpack frame in the rightward-leftward direction. In this case, it becomes possible to prevent a load from being largely imposed on one of the right and left shoulders of the operator carrying the backpack frame on the back.
  • a backpack-type air-blowing working machine in which a pair of volute casings arranged side-by-side in a forward-rearward direction and incorporating, respectively, a pair of centrifugal fans each configured to be driven by a respective one of a pair of front and rear electric motors arranged in a coaxial relation are assembled in an upstanding manner to a backpack frame to be carried on e back of an operator using shoulder straps during use.
  • This backpack-type air-blowing working machine comprises a pair of rechargeable battery packs connected, respectively, to the electric motors, wherein the rechargeable battery packs are detachably attached to the backpack frame, such that a position of the center of gravity of the backpack-type air-blowing working machine as viewed from the rear thereof is located below a rotation axis of the centrifugal fans, and a position of the center of gravity of the backpack-type air-blowing working machine as viewed from the side thereof is located forward of a rear end of the volute casing, and wherein airflows blown out from respective blowing ports of the volute casings according to rotation of the centrifugal fans during operation of the electric motors are merged together and discharged from a blowing duct.
  • a backpack-type air-blowing working machine including a pair of upper and lower volute casings.
  • Each of the volute casings incorporate a centrifugal fan configured to be driven by an electric motor.
  • Each of the volute casing is assembled in an upstanding manner to a backpack frame to be carried on the back of an operator using shoulder straps during use.
  • This backpack-type air-blowing working machine comprises a rechargeable battery pack connected to each of the electric motors, wherein the rechargeable battery pack is detachably attached to the backpack frame, such that a position of the center of gravity of the backpack-type air-blowing working machine as viewed from the rear thereof is located below an output shaft of the electric motor for driving the centrifugal fan in the upper volute casing, and a position of the center of gravity of the backpack-type air-blowing working machine as viewed from the side thereof is located forward of rear ends of the pair of upper and lower volute casings, and wherein airflows blown out from respective blowing ports of the volute casings according to rotation of the centrifugal fans during operation of the electric motor are merged together and discharged from a blowing duct.
  • a small-size fan may be used as each of the pair of centrifugal fans configured to be driven, respectively, by two small-size electric motors.
  • a pair of centrifugal fans each configured to be driven by an independent electric motor are incorporated, respectively, in the pair of volute casings disposed side-by-side in the forward-rearward or upward-downward direction to form a pair of individual blower units, so that it becomes possible to simplify assembling operation for the backpack-type air-blowing working machine.
  • FIG. 1 is a side view of a backpack-type air-blowing working machine according to a first embodiment of the present invention.
  • FIG. 2 is a vertical sectional view of the backpack-type air-blowing working machine depicted in FIG. 1 , at a central position in a rightward-leftward direction.
  • FIG. 3 is a rear view of the backpack-type air-blowing working machine, in a state after a cover depicted in FIG. 2 is detached.
  • FIG. 4 is a vertical sectional view of a backpack-type air-blowing working machine according to a second embodiment of the present invention, at a central position in the rightward-leftward direction.
  • FIG. 5 is a horizontal sectional view depicting respective blowing tube portions of a pair of front and rear volute casings depicted in FIG. 4 .
  • FIG. 6 is a sectional view depicting a coupling portion between the blowing tube portions and a blowing duct depicted in FIG. 5 .
  • FIG. 7 is a vertical sectional view depicting a modification of the blower unit of the backpack-type air-blowing working machine depicted in FIG. 4 .
  • FIG. 8 a is a left side view of a backpack-type air-blowing working machine according to a third embodiment of the present invention.
  • FIG. 8 b is a rear view of e backpack-type air-blowing working machine in FIG. 8 a.
  • FIG. 9 is a vertical sectional view of the backpack-type air-blowing working machine depicted in FIG. 8 b , at a position of each rotation axis thereof.
  • FIG. 10 a is a left side view depicting backpack-type air-blowing working machine according to a fourth embodiment of the present invention.
  • FIG. 10 b is a rear view of backpack-type air-blowing working machine in FIG. 10 a.
  • FIG. 11 is a vertical sectional view of the backpack-type air-blowing working machine depicted in FIG. 10 b, at a position of each rotation axis thereof.
  • FIG. 12 a is a vertical sectional view of a backpack-type air-blowing working machine according to another embodiment of the present invention, at a position of each rotation axis thereof.
  • FIG. 12 b is a vertical sectional view of a backpack-type air-blowing working machine according to yet another embodiment of the present invention, at a position of each rotation axis thereof.
  • FIG. 13 a is a vertical sectional view of a backpack-type air-blowing working machine according to still another embodiment of the present invention, at a position of each rotation axis thereof.
  • FIG. 13 b is a vertical sectional view of a backpack-type air-blowing working machine according to yet still another embodiment of the present invention, at a position of each rotation axis thereof.
  • FIG. 14 is a vertical sectional view of a backpack-type air-blowing working machine according to another further embodiment of the present invention, at a position of each rotation axis thereof.
  • FIG. 15 a is a vertical sectional view of a backpack-type air-blowing working machine according to yet a further embodiment of the present invention, at a position of each rotation axis thereof.
  • FIG. 15 b is a vertical sectional view of a backpack-type air-blowing working machine according to still a further embodiment of the present invention, at a position of each rotation axis thereof.
  • a backpack-type air-blowing working machine 10 comprises: a backpack frame 11 having a back plate portion 12 having a shape conforming to the back of an operator (i.e., a user or a worker); a spiral-shaped volute casing 21 assembled in a standing manner to the backpack frame 11 at a position rearward of the back plate portion 12 ; a centrifugal fan 22 rotatably pivoted within the volute casing 21 ; an electric motor 23 assembled to the volute casing 21 and operable to rotate the centrifugal fan 22 ; four (a plurality of) rechargeable battery packs 40 detachably attached to the backpack frame 11 at a position underneath the volute casing 21 and connected to the electric motor 23 ; and a control device 41 for controlling driving of the electric motor 23 and electric power feeding from the battery packs 40 .
  • a position of the center G of gravity of the backpack-type air-blowing working machine 10 as viewed from the rear thereof is located below a rotation axis (central axis) 22 a of the centrifugal fan 22 , and a position of the center G of gravity of the backpack-type air-blowing working machine 10 as viewed from the side thereof is located forward of a rear end of the volute casing 21 .
  • the backpack frame 11 is configured to be carried on the back of the operator using shoulder straps 13 . Each shoulder strap 13 is attached to a respective one of right and left ends of the back plate portions 12 of the backpack frame 11 .
  • the backpack frame 11 also has a support rack portion 14 integrally formed with the back plate portion 12 to extend horizontally and rearwardly from a lower end of the back plate portion 12 , and the support rack portion 14 of the backpack frame 11 is formed with an air introduction port 14 a for introducing therethrough air into a blower unit 20 composed of the volute casing 21 , the centrifugal fan 22 and the electric motor 23 .
  • the blower unit 20 is configured to rotate the centrifugal fan 22 in the volute casing 21 according to the electric motor 23 to discharge air from a blowing port 21 c at a distal end of an aftermentioned blowing tube portion 21 b.
  • the volute casing 21 has a rear wall formed with an air suction port 21 a, and a right wall provided with a blowing tube portion 21 b extending outwardly.
  • a blowing port 21 c formed at a distal end of the blowing tube portion 21 b is communicated with and connected to a blowing duct 30 .
  • the electric motor 23 is attached to a front wall of the volute casing 21 .
  • the centrifugal fan 22 is fixed to an output shaft 23 a of the electric motor 23 , within the volute casing 21 .
  • an outer rotor-type electric motor is employed as the electric motor 23 .
  • the blower unit 20 By rotatably attaching the centrifugal fan 22 to the output shaft 23 a of the electric motor 23 integrally assembled to the front wall of the volute casing 21 , the blower unit 20 is assembled in a standing manner, as a single unit, to the backpack frame 11 through a coil spring 15 (vibration damping means).
  • the centrifugal fan 22 is directly attached to the output shaft 23 a of the electric motor 23 , and the output shaft 23 a of the electric motor 23 is disposed in coaxial relation to the rotation axis 22 a of the centrifugal fan 22 .
  • the battery packs 40 and the control device 41 are mounted to the support rack portion 14 of the backpack frame 11 located just beneath the blower unit 20 , as mentioned below.
  • the blowing duct 30 connected to the blowing port 21 c of the volute casing 21 comprises a flexible duct 32 connected to a distal end of an elbow duct 31 , and a straight duct 33 connected to a distal end of the flexible duct 32 .
  • a grip 34 to be gripped by an operator is attached to the straight duct 33 , and a nozzle is attached to a distal end of the straight duct 33 .
  • an operator can manipulate the blowing duct 30 so as to direct the distal nozzle of the blowing duct 30 in a desired direction gripping the grip 34 .
  • each of the battery packs 40 is detachably joined to a respective one of the joints 16 .
  • a type of battery pack is rechargeable by a battery charger (not depicted), in a state after it is detached from the joint 16 , and commonly usable as a power supply for other electric gardening machines and various electric tools.
  • the control device 41 is disposed on an upper surface of a front end of the support rack portion 14 of the backpack frame 11 .
  • the control device 41 is operable to control driving of the electric motor 23 and control electric power feeding from the battery packs 40 to the electric motor 23 .
  • the backpack frame 11 is provided with a cover 42 which covers the blower unit 20 and the control device 41 , and the battery packs 40 are attached to the support rack portion 14 of the backpack frame 11 at positions outside the cover 42 .
  • the cover 42 is detachably attached to the backpack frame 11 so as to enable the blower unit 20 and the control device 41 be subjected to maintenance.
  • an operator carries the backpack frame 11 on his/her back by putting the shoulder straps 13 over his/her shoulders, and starts to drive the electric motor 23 by electric power fed from the battery packs 40 .
  • the centrifugal fan 22 is rotated within the volute casing 21 , and air sucked from the air suction port 21 a into the volute casing 21 is discharged from the blowing port 21 c into the blowing duct 30 and finally blown out from the distal nozzle of the blowing duct 30 toward the ground.
  • the operator can move the distal nozzle of the blowing duct 30 in the rightward-leftward direction while gripping the grip 34 so as to blow and collect fallen leaves spread over the ground in a wide range.
  • the above backpack-type air-blowing working machine 10 is configured such that the electric motor 23 is driven by electric power fed from the battery packs 40 .
  • the present inventors has ascertained that, when a position of the center of gravity of the backpack-type air-blowing working machine 10 is located close to an operator at a lower position as much as possible, it is possible to improve usability of the backpack-type air-blowing working machine 10 and reduce fatigue of the operator.
  • the volute casing 21 is disposed in a standing manner rearward of the back plate portion 12 , in such a manner that an axis of a volute of volute casing 21 is located in orthogonal relation to the back plate portion 12 .
  • a length of the backpack frame 11 in the forward-rearward direction is reduced to enable the volute casing 21 to be disposed at a position closer to the back of an operator.
  • the electric motor 23 as a heavy load is fixed to the front wall of the volute casing 21 so as to conic close to the back of an operator.
  • the battery packs 40 are assembled, respectively, to the joints 16 on the support rack portion 14 formed to extend rearwardly and horizontally from the lower end of the back plate portion 12 of the backpack frame 11 and located just beneath the volute casing 21 , in such a manner as to be disassemblable in the forward-rearward direction.
  • a position of the center G of gravity of the backpack-type air-blowing working machine 10 as viewed from the rear thereof is located below the rotation axis 22 a of the centrifugal fan 22
  • a position of the center G of gravity of the backpack-type air-blowing working machine 10 as viewed from the side thereof is located forward of the rear end of the volute casing 21 , particularly, in the first embodiment, located forward of a center line Cf of the volute casing 21 in the forward-rearward direction, as depicted in FIGS. 2 and 3 .
  • the battery packs 40 in charging operation for the battery packs 40 , can be detached from the support rack portion 14 without detaching, from the backpack frame 11 , the cover 42 covering the blower unit 20 and the control device 41 , so that it becomes possible to detach the battery packs 40 without taking time and effort for detaching the cover 42 .
  • the backpack-type air-blowing working machine 10 when the backpack-type air-blowing working machine 10 is placed on a horizontal mounting surface such that the back plate portion 12 is in a standing posture, the back plate portion 12 is kept in the standing posture, in both of the state in which the battery packs 40 are attached to the support rack portion 14 of the backpack frame 11 and the state after the battery packs 40 are detached from the support rack portion 14 .
  • the backpack-type air-blowing working machine 10 by hand to maintain the standing posture, before and after attachment of the battery packs 40 , so that it becomes possible to facilitate the detaching and attaching operations for charging the battery packs 40 .
  • the position of the center G of gravity of the backpack-type air-blowing working machine 10 as viewed from the rear thereof is located within a region Cw extending from a center line C of the backpack frame 11 in each of a rightward direction and a leftward direction, by a length of 10% of a maximum width of the backpack frame 11 in the rightward-leftward direction, so that it becomes possible to prevent a load from being largely imposed on one of the right and left shoulders of the operator carrying the backpack frame 11 on his/her back.
  • respective sets of the four (plurality of) joints 16 and the four (plurality of) battery packs 40 are equally divided into two and arranged on both sides of a center line of the backpack frame 11 in the rightward-leftward direction. This makes it possible to provide good weight balance in the rightward-leftward direction of the backpack-type air-blowing working machine 10 .
  • a pair of front and rear volute casings 21 A, 21 B internally provided, respectively, with a pair of centrifugal fans 22 A, 22 B each configured to be driven by a respective one of a pair of front and rear electric motors 23 A, 23 B arranged in coaxial relation are assembled in a standing manner to a backpack frame 11 .
  • Positions of the rear volute casing 21 B and the rear centrifugal fan 22 B are also shown in FIG. 3 .
  • the first electric motor 23 A is integrally assembled to a rear wall of the front-side first volute casing 21 A, and the first centrifugal fan 22 A is rotatably attached to an output shaft 23 Aa of the first electric motor 23 A within the first volute casing 21 A, to form a first blower unit 20 A.
  • the first volute casing 21 A has a front wall formed with an air suction port 21 Aa, and a right wall provided with a blowing tube portion 21 Ab serving as a spiral-shaped outer distal end.
  • the second electric motor 23 B is integrally assembled to a front wall of the rear-side second volute casing 21 B, and the second centrifugal fan 22 B is rotatably attached to an output shaft 23 Ba of the second electric motor 23 B within the second volute casing 21 B, to form a second blower unit 20 B.
  • the second volute casing 21 B has a rear wall formed with an air suction port 21 Ba, and a right wall provided with a blowing tube portion 21 Bb serving as a spiral-shaped outer distal end.
  • Respective blowing ports 21 Ac, 21 Bc of the first and second volute casings 21 A, 21 B are communicated with and connected to an elbow duct 31 of a blowing duct 30 so as to enable airflows discharged from the blowing tube portions 21 Ab, 21 Bb to be merged together and discharged thereinto.
  • the first volute casing 21 A is formed such that a spiral-shaped air passage is gradually expanded toward the blowing port 21 Ac. More specifically, it is formed such that, toward the blowing port 21 Ac, a spiral-shaped air passage is gradually expanded rearwardly in an axial direction of a volute of the first volute casing 21 A.
  • the second volute casing 21 B is formed such that a spiral-shaped air passage is gradually expanded toward the blowing port 21 Bc. More specifically, it is formed such that, toward the blowing port 21 Bc, the spiral-shaped air passage is gradually expanded forwardly in an axial direction of a volute of the second volute casing 21 B.
  • first and second volute casings 21 A, 21 B are displaced to gradually come closer to each other in the axial direction, toward the blowing ports 21 Ac, 21 Bc, and respective distal ends of the blowing tube portions 21 Ab, 21 Bb of the first and second volute casings 21 A, 21 B are communicated with and connected to an inlet region 31 a of the blowing duct 30 .
  • the blowing tube portions 21 Ab, 21 Bb of the first and second volute casings 21 A, 21 B are displaced to gradually come closer to each other in the axial direction, toward the blowing ports 21 Ac, 21 Bc, airflows discharged from the blowing tube portions 21 Ab, 21 Bb are merged such that a discharge direction of air blown out from the blowing port 21 Ac of the blowing tube portion 21 Ab and a discharge direction of air blown out from the blowing port 21 Bc of the blowing tube portion 21 Bb intersect each other at an angle ⁇ of 5° (see FIG. 6 ).
  • volute casing 21 A is fixed to a back plate portion 12 through a coil spring 15 , so that the first blower unit 20 A is elastically supported by the backpack frame 11 .
  • the second electric motor 20 B is coaxially fixed to the first electric motor 23 A, so that the second blower unit 20 B is elastically supported by the backpack frame 11 through the first blower unit 20 A.
  • Battery packs 40 for feeding electric power to the electric motors 23 A, 23 B are attached onto a support rack portion 14 formed to extend rearwardly and horizontally from a lower end of the back plate portion 12 of the backpack frame 11 and located just beneath the volute casings 21 A, 21 B, in such a manner as to be detachable in a frontward-rearward direction, as with the first embodiment.
  • a control device 41 for controlling driving of the electric motors 23 A, 23 B is also attached to an upper surface of a front end of support rack portion 14 . Remaining major structures are the same as those in the first embodiment.
  • the backpack-type air-blowing working machine 10 configured such that air is blown by the first centrifugal fan 22 A, and the second centrifugal fan 22 B which is a separate component from the first centrifugal fan 22 A, and respective airflows from the first and second centrifugal fans 22 A, 22 B are merged in the inlet region 31 a of the blowing duct 30 .
  • the backpack-type air-blowing working machine 10 according to the second embodiment when the fan is reduced in size, it is possible to obtain a sufficient airflow volume by the two centrifugal fans 22 A, 22 B, while reducing blowing noise as compared to the case of using a single large fan.
  • the backpack-type air-blowing working machine 10 comprises the first electric motor 23 A for rotating the first centrifugal fan 22 A, and the second electric motor 23 B for rotating the second centrifugal fan 22 B.
  • the backpack-type air-blowing working machine 10 is configured such that airflows blown out from the blowing ports 21 Ac, 21 Bc of the first and second volute casings 21 A, 21 B of the first and second blower units 20 A, 20 B are merged in the inlet region 31 a of the blowing duct 30 and then discharged.
  • the angle ⁇ defined by a course direction of air discharged from the blowing port 21 Ac of the first volute casing 21 A and a course direction of air discharged from the blowing port 21 Bc of the second volute casing 21 B is set to 5° so as to allow the two course directions to become maximally close to parallel relation.
  • the angle ⁇ defined by the course direction of air discharged from the blowing port 21 Ac of the first volute casing 21 A and the course direction of air discharged from the blowing port 21 Bc of the second volute casing 21 B is not limited to 5°, but may be appropriately set in the range of 5° to 45°. In this case, it is also possible to obtain a required effect.
  • the electric motors 23 A, 23 B as heavy loads are arranged as forward as possible to come close to the back of an operator, and the battery packs 40 are assembled onto the support rack portion 14 of the backpack frame 11 in such a manner as to be disassemblable in the forward-rearward direction, as with the first embodiment.
  • a position of the center G of gravity of the backpack-type air-blowing working machine 10 as viewed from the rear thereof is located below respective rotation axes 22 Aa, 22 Ba of the centrifugal fans 22 A, 22 B, and a position of the center G of gravity of the backpack-type air-blowing working machine 10 as viewed from the side thereof is located forward of a rear end of the rear-side second volute casing 21 B, particularly, in the second embodiment, located forward of a center line Cf of the rear-side second volute casing 21 B in the forward-rearward direction.
  • FIG. 3 is a rear view of the backpack-type air-blowing working machine 10 according to the first embodiment, the backpack-type air-blowing working machine 10 according to the second embodiment can be depicted in the same manner as that in FIG. 3 .
  • the reference signs in the second embodiment are added to corresponding reference signs in FIG. 3 in brackets.
  • the first blower unit 20 A and the second blower unit 20 B each lying in a horizontal posture are arranged one-above-the-other, and assembled to the backpack frame 11 .
  • the air suction port 21 Aa is provided in an upper wall of the first blower unit 20 A
  • the air suction port 21 Ba is provided in a lower wall of the second blower unit 20 B. Remaining structures are substantially the same as those in the second embodiment.
  • a backpack-type air-blowing working machine 10 is characterized in that a first blower unit 20 A and a second blower unit 20 B are arranged one-above-the-other at a position behind an aftermentioned back plate portion 12 .
  • the first blower unit 20 A and the second blower unit 20 B are arranged one-above-the-other at a position offset rightwardly from a center line of a back plate portion 12 of a backpack frame 11 in a rightward-leftward direction (see FIG. 8 b ), in order to achieve a weight balance when aftermentioned battery packs 40 are arranged side-by-side in an upward-downward direction, in a left end region of back plate portion 12 .
  • a first electric motor 32 A is integrally assembled to a front wall of an upper-side first volute casing 21 A, and a first centrifugal fan 22 A is rotatably attached to an output shaft 23 Aa of the first electric motor 23 A within the first volute casing 21 A, to form the first blower unit 20 A.
  • a second electric motor 23 B is integrally assembled to a front wall of a lower-side second volute casing 21 B, and a second centrifugal fan 22 B is rotatably attached to an output shaft 23 Ba of the second electric motor 23 B within the second volute casing 21 B, to form the second blower unit 20 B.
  • each of the first and second volute casings 21 A, 21 B has a rear wall formed with an air suction port ( 21 Aa, 21 Ba), and a right wall provided with a blowing tube portion ( 21 Ab, 21 Bb) serving as a spiral-shaped outer distal end.
  • Respective blowing ports 21 Ac, 21 Bc of the first and second volute casings 21 A, 21 B are communicated with and connected to an inlet region 31 a of a blowing duct 30 , respectively, through a first connection duct 24 A and a second connection duct 24 B, so that airflows discharged from the blowing tube portions 21 Ab, 21 Bb are merged together through the first and second connection ducts 24 A, 24 B, and introduced into the blowing duct 30 .
  • each of the battery packs 40 is detachably attached to a respective one of the joints 16 .
  • the four battery packs 40 are detachably attached, respectively, to the joints 16 of the backpack frame 11 , at positions outside a cover 42 .
  • the four battery packs 40 is attached to the left end region of the back plate portion 12 in order to achieve a weight balance in the rightward-leftward direction, with respect to the blowing duct 30 communicated with and connected to the blowing ports 21 Ac, 21 Bc of the first and second volute casings 21 A, 21 B on a right side of the backpack frame 11 .
  • the electric motors 23 A, 23 B assembled to the first and second volute casings 21 A, 21 B are arranged just behind the back plate portion 12 , and the battery packs 40 are arranged below a rotation axis 22 Aa of the upper-side first centrifugal fan 22 A.
  • a position of the center G of gravity of the backpack-type air-blowing working machine 10 as viewed from the rear thereof is located below the rotation axis 22 Aa of the upper-side first centrifugal fan 22 A, and a position of the center G of gravity of the backpack-type air-blowing working machine 10 as viewed from the side thereof is located forward of rear ends of the first and second volute casings 21 A, 21 B, particularly, in the third embodiment, located forward of a center line Cf of the first and second volute casings 21 A, 21 B in the forward-rearward direction.
  • the position of the center G of gravity of the backpack-type air-blowing working machine as viewed from the rear thereof is located within a region Cw extending from a center line C of the backpack frame 11 in each of a rightward direction and a leftward direction, by a length of 10% of a maximum width of the backpack frame 11 in the rightward-leftward direction, so that it becomes possible to prevent a load from being largely imposed on one of the right and left shoulders of the operator carrying the backpack frame 11 on the back.
  • the hack plate portion 12 when the backpack-type air-blowing working machine 10 is placed on a horizontal mounting surface such that the back plate portion 12 is in a standing posture, the hack plate portion 12 is kept in the standing posture, in both of a state in which the battery packs 40 are attached to the joints 16 of back plate portion 12 of the backpack frame 11 and a state after the battery packs 40 are detached from the joints 16 of the back plate portion 12 .
  • the backpack-type air-blowing working machine 10 by hand to maintain the standing posture, before and after attachment of the battery packs 40 , so that it becomes possible to facilitate the detaching and attaching operations for charging the battery packs 40 .
  • each of the volute casings 21 A, 21 B has a respective blowing tube portion 21 Ab, 21 Bb for blowing out air, on a right side thereof as one side in the rightward-leftward direction, and the blowing duct 30 is communicated with and connected to the blowing tube portion 21 Ab, 21 Bb.
  • the joints 16 for the battery packs 40 are provided on a left side of the backpack frame 11 as the other side in the rightward-leftward direction.
  • the blowing duct 30 is disposed on the right side as one side in the rightward-leftward direction, and the battery packs 40 are arranged on the left side as the other side in the rightward-leftward direction, so that becomes possible to provide good weight balance in the rightward-leftward direction during use of the backpack-type air-blowing working machine 10 .
  • airflows blown out from the blowing ports 21 Ac, 21 Bc of the first and second volute casings 21 A, 21 B of the first and second blower units 20 A, 20 B are merged in the inlet region 31 a of the blowing duct 30 through the first and second connection ducts 24 A, 24 B, and then discharged.
  • an angle ⁇ defined by a course direction of air discharged from the blowing port 21 Ac of the first volute casing 21 A and a course direction of air discharged from the blowing port 21 Bc of the second volute casing 21 B is set to 45°.
  • a first blower unit 20 A and a second blower unit 20 B are arranged one-above-the-other at a position behind a back plate portion 12 , as with the third embodiment.
  • the lower-side second blower unit 20 B is disposed offset rearwardly from the first blower unit 20 A so as to eliminate interference or contact between a lower portion of the upper-side first blower unit 20 A and an upper portion of the lower-side second blower unit 20 B, and the upper-side first blower unit 20 A is disposed at a lower position than that in the third embodiment.
  • the first blower unit 20 A and the second blower unit 20 B are arranged rearwardly as compared to the position in the third embodiment.
  • a plurality of battery packs 40 can be arranged to come close to a central region of the back plate portion 12 .
  • the first blower unit 20 A and the second blower unit 20 B are arranged in an overlapping manner in the upward-downward direction, so that an angle ⁇ defined by a course direction of air discharged from a blowing port 21 Ac of a first volute casing 21 A and a course direction of air discharged from a blowing port 21 Bc of a second volute casing 21 B can be set to 8.5°.
  • the angle ⁇ can be reduced to a smaller value than that in the third embodiment.
  • each of the first and second blower units 20 A, 20 B may be turned back-to-front, and the upper-side first blower unit 20 A may be disposed forward of the lower-side second blower unit 20 B, i.e., the lower-side second blower unit 20 B may be disposed rearward of the upper-side first blower unit 20 A.
  • the lower-side second blower unit 20 B may be disposed rearward of the upper-side first blower unit 20 A.
  • the upper-side first blower unit 20 A may be disposed rearward of the lower-side second blower unit 20 B, i.e., the lower-side second blower unit 20 B may be disposed forward of the upper-side first blower unit 20 A.
  • the air suction port 21 Aa of the upper-side first blower unit 20 A may be disposed to face rearwardly, and the air suction port 21 Ba of the lower-side second blower unit 20 B may be disposed to face forwardly.
  • each of the blowing tube portions 21 Ab, 21 Bb of the first and second blower units 20 A, 20 B extends downwardly, and each of the blowing ports 21 Ac, 21 Bc faces obliquely downwardly.
  • the angle ⁇ defined by the course direction of air discharged from the blowing port 21 Ac of the first volute casing 21 A and the course direction of air discharged from the blowing port 21 Bc of the second volute casing 21 B is set in the range of 5° to 45°, and airflows discharged from the volute casings 21 A, 21 B are merged in the inlet region 31 a of the blowing duct 30 , so that it becomes possible to suppress the possibility that respective airflows blown out from the blowing ports 21 Ac, 21 Bc collide with each other.
  • a spiral direction of a volute in the volute casing of the lower-side second blower unit 20 B may be reversed to enable the blowing port 21 Bc to face obliquely upwardly.
  • a backpack-type air-blowing working machine 10 is characterized in that a first blower unit 20 A and a second blower unit 20 B are arranged one-above-the-other at a position behind a back plate portion 12 , and each of output shafts 23 Aa, 23 Ba of first and second electric motors 23 A, 23 B each operable to drive a respective one of first and second centrifugal fans 22 A, 22 B is disposed to incline obliquely downwardly in a rearward direction at an inclination angle of 45°.
  • a position of the center G of gravity of the backpack-type air-blowing working machine 10 as viewed from the rear thereof is located below a rotation axis 22 Aa of the first centrifugal fan 22 A, and a position of the center G of gravity of the backpack-type air-blowing working machine 10 as viewed from the side thereof is located forward of a center line of the first and second volute casings 21 A, 21 B in the forward-rearward direction, so that even when an operator performs cleaning operation while carrying the backpack-type air-blowing working machine 10 on his/her back, it becomes possible to prevent shoulder straps 13 from be put over the shoulders of the operator in such a manner as to pull the operator rearwardly, thereby facilitating the cleaning operation.
  • a first blower unit 20 A and a second blower unit 20 B may be arranged such that each of an air suction port 21 Aa and an air suction port 21 Ba thereof faces forwardly and obliquely downwardly.
  • the first and second volute casings 21 A, 21 B may be arranged such that each of the air suction ports 21 Aa, 21 Ba thereof faces forwardly and obliquely upwardly.
  • each of the first and second blower units 20 A, 20 B is inclined by 45°. However, this inclination angle is not limited to 45°. Further, the first volute casing 21 A and the second volute casing 21 B may be inclined, respectively, at different inclination angles.
  • the back plate portion 12 is formed with an air introduction port 12 a
  • the support rack portion 14 is formed with the air introduction port 14 a.
  • only the support rack portion 14 is formed with the air introduction port 14 a.
  • a space defined by the backpack frame 11 and the cover 42 is opened to the outside only via the air introduction port 14 a of the support rack portion 14 , so that it becomes possible to reduce noise to be felt by an operator.
  • a sound absorption material may be provided on an inner surface of the cover 42 , or a sound absorption material such as sponge or a sound absorption structure such as a silencer may be provided in the first and second volute casings 21 A, 21 B or a blowing passage such as the blowing duct 30 . This makes it possible to further reduce noise to be felt by an operator.
  • the functions/effects arising from the reductions in size of fan and the electric motor, and the merging of airflows from the blowing ports, based on providing two blower units, i.e., the first and second blower units 20 A, 20 B, can be obtained in any other suitable type of backpack-type air-blowing working machine.
  • a fan is not limited to a centrifugal fan, but an axial flow fan or a diagonal flow fan provided in a cylindrical casing may be used to obtain the same functions/effects.
  • an engine-type prime mover composed of an internal combustion engine may be used to obtain the same functions/effects.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cleaning Of Streets, Tracks, Or Beaches (AREA)
US15/566,340 2015-04-20 2016-04-12 Backpack-type air blowing working machine Abandoned US20180094393A1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP2015-086173 2015-04-20
JP2015086173A JP2016204930A (ja) 2015-04-20 2015-04-20 背負式送風作業機
JP2015086176A JP6621594B2 (ja) 2015-04-20 2015-04-20 背負式送風作業機
JP2015086171A JP6532271B2 (ja) 2015-04-20 2015-04-20 背負式送風作業機
JP2015-086176 2015-04-20
JP2015-086171 2015-04-20
PCT/JP2016/061754 WO2016171031A1 (ja) 2015-04-20 2016-04-12 背負い式送風作業機

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US20180094393A1 true US20180094393A1 (en) 2018-04-05

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US15/566,340 Abandoned US20180094393A1 (en) 2015-04-20 2016-04-12 Backpack-type air blowing working machine

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US (1) US20180094393A1 (de)
CN (1) CN107407064A (de)
DE (1) DE112016001826T5 (de)
WO (1) WO2016171031A1 (de)

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US20180175702A1 (en) * 2016-12-16 2018-06-21 Industrial Technology Research Institute Motor shaft system with a cooling function
CN112081763A (zh) * 2019-06-14 2020-12-15 株式会社牧田 鼓风机
CN112628166A (zh) * 2019-09-24 2021-04-09 株式会社牧田 鼓风机
US10980193B2 (en) * 2016-02-22 2021-04-20 Globe (jiangsu) Co., Ltd. Piggyback working appliance, piggyback blower, and control handle assembly
US20220201947A1 (en) * 2019-10-02 2022-06-30 Yamabiko Corporation Backpack blower working machine
US11434929B2 (en) 2019-08-02 2022-09-06 Techtronic Cordless Gp Blowers having noise reduction features
US11617312B2 (en) * 2017-03-30 2023-04-04 Globe (jiangsu) Co., Ltd. Backpack tool apparatus
US11778960B2 (en) 2020-01-21 2023-10-10 Techtronic Cordless Gp Blowers
US11817073B2 (en) 2020-01-21 2023-11-14 Techtronic Cordless Gp Power tool having noise reduction features
US11889794B2 (en) 2020-12-30 2024-02-06 Milwaukee Electric Tool Corporation Handheld blower

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CN213546487U (zh) * 2020-10-15 2021-06-25 苏州科瓴精密机械科技有限公司 背负式作业工具
CN213546474U (zh) * 2020-10-15 2021-06-25 苏州科瓴精密机械科技有限公司 背负式作业工具

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Cited By (14)

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Publication number Priority date Publication date Assignee Title
US10980193B2 (en) * 2016-02-22 2021-04-20 Globe (jiangsu) Co., Ltd. Piggyback working appliance, piggyback blower, and control handle assembly
US20180175702A1 (en) * 2016-12-16 2018-06-21 Industrial Technology Research Institute Motor shaft system with a cooling function
US11617312B2 (en) * 2017-03-30 2023-04-04 Globe (jiangsu) Co., Ltd. Backpack tool apparatus
US11980139B2 (en) 2017-03-30 2024-05-14 Greenworks (Jiangsu) Co., Ltd. Backpack tool apparatus
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US11434929B2 (en) 2019-08-02 2022-09-06 Techtronic Cordless Gp Blowers having noise reduction features
US11841023B2 (en) 2019-08-02 2023-12-12 Techtronic Cordless Gp Blowers having noise reduction features
CN112628166A (zh) * 2019-09-24 2021-04-09 株式会社牧田 鼓风机
US20220201947A1 (en) * 2019-10-02 2022-06-30 Yamabiko Corporation Backpack blower working machine
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US11778960B2 (en) 2020-01-21 2023-10-10 Techtronic Cordless Gp Blowers
US11817073B2 (en) 2020-01-21 2023-11-14 Techtronic Cordless Gp Power tool having noise reduction features
US11889794B2 (en) 2020-12-30 2024-02-06 Milwaukee Electric Tool Corporation Handheld blower

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DE112016001826T5 (de) 2018-01-11
CN107407064A (zh) 2017-11-28

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