Garden tool having blowing function

Patent metadata

Field	Value
Publication number	US-2024032489-A1
Application number	US-202318244743-A
Country	US
Kind code	A1
Filing date	Sep 11, 2023
Priority date	Mar 12, 2021
Publication date	Feb 1, 2024
Grant date	—

Abstract

A garden tool with a blowing function includes a housing having an air inlet; a blowing tube, connected with the housing, wherein the blowing tube is provided with an air outlet for air to be blown out; a fan, rotating around a fan axis, for making air flow and blowing the air out from the air outlet; and a motor, configured for driving the fan to rotate around the fan axis; wherein when the motor operates at a maximum rotational speed, blowing force F and noise LP of the garden tool with a blowing function satisfy following relationships: 16 N≤F≤23 N, and 53 dBA≤LP<57 dBA; or 23 N<F≤40 N, and 53 dBA≤LP≤0.0121F2−0.0603F+53.065 dBA.

First claim

What is claimed is:

1 . A garden tool ( 100 ) with a blowing function, comprising:
a housing ( 10 ), provided with an air inlet ( 11 ); a blowing tube ( 20 ), connected with the housing ( 10 ), wherein the blowing tube ( 20 ) is provided with an air outlet ( 22 ) for air to be blown out; a fan ( 50 ), rotating around a fan axis ( 51 ), for making air flow and blowing the air out from the air outlet ( 22 ); and a motor, configured for driving the fan ( 50 ) to rotate around the fan axis ( 51 ); wherein when the motor operates at a maximum rotational speed, blowing force F and noise LP of the garden tool ( 100 ) with a blowing function satisfy following relationships:
16 N≤ F≤ 23 N, and 53 dBA≤ LP< 57 dBA; or

23 N< F≤ 40 N, and 53 dBA≤ LP≤ 0.0121 F 2 −0.0603 F+ 53.065 dBA.

2 . The garden tool ( 100 ) with a blowing function according to claim 1 , wherein the rotational speed of the motor is 16000 r/min to 26000 r/min.

3 . The garden tool ( 100 ) with a blowing function according to claim 1 , wherein a diameter of a projection profile of the fan ( 50 ) in a plane perpendicular to the fan axis ( 51 ) is 88 mm to 120 mm.

4 . The garden tool ( 100 ) with a blowing function according to claim 1 , wherein when the motor operates at the maximum rotational speed, the blowing force F and the noise LP of the garden tool ( 100 ) with a blowing function satisfy following relationships:
23 N< F≤ 40 N, and 53 dBA≤ LP≤ 0.0081 F 2 +0.1374 F+ 48.473 dBA.

5 . The garden tool ( 100 ) with a blowing function according to claim 1 , wherein an air volume Q, pressure P pressure , and input power P power of the motor of the garden tool ( 100 ) with a blowing function respectively satisfy following relationships:
450 cfm≤ Q ≤1500 cfm, 1400 Pa≤ P pressure ≤5000 Pa, and 700 W≤ P power ≤3000 W.

6 . The garden tool ( 100 ) with a blowing function according to claim 1 , wherein the garden tool is a blower for blowing leaves on the ground, the blower comprises an air intake shield ( 60 ) connected to the air inlet ( 11 ), and the fan ( 50 ) is configured to rotate around the fan axis ( 51 ) and introduce external air through the air intake shield ( 60 ); and
the fan ( 50 ) comprises: a hub ( 52 ); and a plurality of fan blades ( 54 ) extending outwards from the hub ( 52 ) in a radial direction and distributed around the fan axis ( 51 ); the fan blade ( 54 ) comprises a pressure surface ( 543 ) configured for generating airflow, and a suction surface ( 545 ), the pressure surface ( 543 ) and the suction surface ( 545 ) intersect in the direction of the fan axis ( 51 ) to form a front edge ( 546 ) and a rear edge ( 548 ), the front edge is located in front of the rear edge in a rotating direction of the fan, in the direction of the fan axis ( 51 ), a minimum distance between the front edge ( 546 ) of the fan blade of the fan ( 50 ) and the air intake shield ( 60 ) is D5, a length of the garden tool is L0; and
wherein 0.15≤ D 5: L 0≤0.4.

7 . The garden tool ( 100 ) with a blowing function according to claim 6 , wherein the blower further comprises a duct ( 30 ) connected with the housing; and
the duct ( 30 ) comprises an outer guide cover ( 32 ), an inner guide cover ( 34 ), and first stationary vanes ( 36 ) connected between the outer guide cover ( 32 ) and the inner guide cover ( 34 ), and the motor is accommodated in the inner guide cover ( 34 ); and the air inlet and the outer guide cover ( 32 ) are sectioned by a plane perpendicular to the fan axis, and a ratio of a cross sectional area S1 of a section of the air inlet ( 11 ) to a cross sectional area S2 of a section of the outer guide cover ( 32 ) is 1.6 to 4.

8 . The garden tool ( 100 ) with a blowing function according to claim 1 , wherein the fan ( 50 ) comprises:
a hub ( 52 ); and a plurality of fan blades ( 54 ) extending outwards from the hub ( 52 ) in a radial direction and distributed around the fan axis ( 51 ); the fan blade ( 54 ) comprises a pressure surface ( 543 ) configured for generating airflow, and a suction surface ( 545 ), the pressure surface ( 543 ) and the suction surface ( 545 ) intersect in the direction of the fan axis ( 51 ) to form a front edge ( 546 ) and a rear edge ( 548 ), the front edge is located in front of the rear edge in a rotating direction of the fan, and projections of adjacent front edges and rear edges of two adjacent fan blades do not overlap in a plane perpendicular to the fan axis ( 51 ); and an interval gap is provided between projections of the two adjacent fan blades ( 54 ) in the plane perpendicular to the fan axis ( 51 ), and the interval gap D0 is greater than 0 mm and less than or equal to 4 mm.

9 . The garden tool ( 100 ) with a blowing function according to claim 8 , wherein the fan axis ( 51 ) is defined as an X-axis, a line passing through one end point of the front edge ( 546 ) close to the hub ( 52 ) and perpendicular to and intersected with the fan axis ( 51 ) is defined as a Y-axis, and a line perpendicular to and intersected with the X-axis and the Y-axis is defined as a Z-axis;
a maximum distance between projections of the suction surface ( 545 ) and the pressure surface ( 543 ) in a plane formed by the X-axis and the Z-axis is defined as a maximum thickness h of the fan blade ( 54 ); and a ratio of a value of the interval gap D0 to a value of the maximum thickness h of the fan blade ( 50 ) ranges from 1 to 1.5.

10 . The garden tool ( 100 ) with a blowing function according to claim 8 , wherein the fan blades ( 54 ) are formed on the hub ( 52 ) through injection molding or die casting.

11 . The garden tool ( 100 ) with a blowing function according to claim 1 , wherein the fan ( 50 ) comprises: a hub ( 52 ); and
a plurality of fan blades ( 54 ) extending outwards from the hub ( 52 ) in a radial direction and distributed around the fan axis ( 51 ), the fan blade ( 54 ) comprises a root portion ( 542 ) fixed to the hub ( 52 ), a top edge ( 544 ) spaced from the hub ( 52 ), and a front edge ( 546 ) and a rear edge ( 548 ) extending between the root portion ( 542 ) and the top edge ( 544 ), and in a rotating direction of the fan ( 50 ), the front edge ( 546 ) is located in front of the rear edge ( 548 ); the fan axis ( 51 ) is defined as an X-axis, a line passing through one end point of the front edge ( 546 ) close to the hub ( 52 ) and perpendicular to and intersected with the fan axis ( 51 ) is defined as a Y-axis, and a line perpendicular to and intersected with the X-axis and the Y-axis is defined as a Z-axis; and midpoints of projections of the root portion ( 542 ) and the top edge ( 544 ) in a plane formed by the X-axis and the Y-axis are correspondingly defined as a first midpoint ( 5421 ) and a second midpoint ( 5441 ), a line passing through the first midpoint ( 5421 ) and parallel to the Y-axis is defined as a first vertical axis ( 5422 ), and in an airflow flowing direction, the second midpoint ( 5441 ) is located on a downstream side of the first vertical axis ( 5422 ) facing the air outlet of the blowing tube ( 20 ).

12 . The garden tool ( 100 ) with a blowing function according to claim 11 , wherein an included angle β between a line connecting the first midpoint ( 5421 ) and the second midpoint ( 5441 ) and the first vertical axis ( 5422 ) is 0° to 9°.

13 . The garden tool ( 100 ) with a blowing function according to claim 11 , wherein a projection of the front edge ( 546 ) in a plane formed by the Y-axis and the Z-axis is defined as a front side projection ( 5461 ), and a line connecting two opposite end points of the front side projection ( 5461 ) is defined as a chord line L ( 5462 ); and

Assignees

• Positec Power Tools Suzhou Co Ltd

Inventors

• Liu Zhengwei
• Xie Wenhui
• Li Chengzhong
• Yu Xuefeng
• Duan Fengwei
• Jiao Shiping

Classifications

• A01G20/47 Primary

  Vacuum or blower devices · CPC title

• E01H1/0809 Primary

  Loosening or dislodging by blowing (combined with suction E01H1/0863; with steam E01H1/10; removing snow by blowing E01H5/106; cleaning rails by blowing E01H8/105, E01H8/125; removing fog by blowing E01H13/00; cleaning joints in road construction by blowing E01C23/0906); Drying by means of gas streams (combined with snow or ice melting E01H5/10) · CPC title

• F04D29/384 Primary

  characterised by form · CPC title

• F04D29/703

  specially for fans, e.g. fan guards · CPC title

• F04D29/544

  Blade shapes · CPC title