Garden blower

Patent metadata

Field	Value
Publication number	US-2022183241-A1
Application number	US-202017598669-A
Country	US
Kind code	A1
Filing date	Mar 27, 2020
Priority date	Mar 27, 2019
Publication date	Jun 16, 2022
Grant date	—

Abstract

The present invention relates to a garden blower. The garden blower includes: an extension rod; an air duct portion, disposed on one end of the extension rod; a motor; a fan; and an operating handle, spaced apart from the air duct portion in a longitudinal direction, where a ratio of a length of the air duct portion in the longitudinal direction to a length of the entire garden blower in the longitudinal direction is less than or equal to 60%, and a weight of the garden blower does not exceed 2 kg.

First claim

What is claimed is:

1 . A garden blower, capable of gathering scattered foreign objects, the garden blower comprising:
an extension rod, extending a preset distance along a longitudinal direction; an air duct portion, wherein the air duct portion is provided respectively with an air inlet and an air outlet that are in communication with the outside; a motor, configured to provide a driving force for the garden blower; a power supply, configured to provide energy for the motor; a fan, disposed inside the air duct portion and driven by the motor to rotate around a fan axis and generate an airflow; and an operating handle, provided for a user to hold during operation, wherein the operating handle and the air duct portion are spaced apart from each other in the longitudinal direction and are disposed on two ends of the extension rod, wherein a ratio of a length of the air duct portion in the longitudinal direction to a length of the entire garden blower in the longitudinal direction is less than or equal to 60%, and in a state in which the power supply is not combined, a weight of the garden blower does not exceed 2 kg.

2 . The garden blower according to claim 1 , wherein the length of the air duct portion is not greater than 500 mm, and a maximum cross-sectional area of the air duct portion in a direction perpendicular to the longitudinal direction is less than or equal to 65×10 2 mm 2 and greater than or equal to 22×10 2 mm 2 .

3 . The garden blower according to claim 1 , wherein a diameter of the motor is not greater than 45 mm.

4 . The garden blower according to claim 1 , wherein a diameter of the fan is greater than or equal to 32 mm and less than or equal to 67 mm.

5 . The garden blower according to claim 1 , wherein in a state in which the power supply is not combined, the weight of the garden blower is not greater than 1.5 kg.

6 . The garden blower according to claim 1 , wherein an air volume provided by the garden blower is not less than 300 cfm, and an air speed provided by the garden blower is not lower than 130 mph; and a rotational speed of the motor is configured to be higher than 35000 rpm and lower than or equal to 80000 rpm.

7 . The garden blower according to claim 1 , wherein a rotational speed of the motor is configured to be higher than 35000 rpm and lower than or equal to 100000 rpm in a manner in which a ratio of a maximum output power of the motor connected to the garden blower to the weight of the garden blower that is not combined with the power supply is not less than 400 W/kg.

8 . The garden blower according to claim 1 , wherein a maximum output power of the motor is 600 W to 1600 W.

9 . The garden blower according to claim 1 , wherein a rotational speed of the motor is configured to be higher than 35000 rpm and lower than or equal to 80000 rpm in a manner in which a ratio of a maximum air speed of the garden blower to a diameter of the fan is not less than 2.5 mph/mm, and the weight of the garden blower that is not combined with the power supply is not greater than 1.5 kg.

10 . The garden blower according to claim 1 , wherein the motor is a coreless motor, and a stator and a rotor are disposed in the coreless motor, wherein the stator comprises a casing, a stator lamination stack, and a winding coil, the stator lamination stack comprises a plurality of annular magnetic conductive sheets, and the winding coil is directly wound by an enameled wire and forms a cylindrical shape to accommodate the rotor; and the rotor comprises a rotating shaft and a magnetic ring disposed on a periphery of the rotating shaft.

11 . The garden blower according to claim 1 , wherein the power supply comprises at least one battery pack configured to provide energy for the motor.

12 . The garden blower according to claim 11 , wherein the garden blower further comprises a flow guiding cone and stationary blades that are disposed inside the air duct portion and configured to guide an airflow to move toward the air outlet; the air duct portion, the motor, the fan, the flow guiding cone, and the stationary blades are defined as a first assembly located on one end of the extension rod, and the battery pack is defined as a second assembly located on the other end of the extension rod; and a ratio of a weight of the second assembly to a weight of the first assembly does not exceed 1.5.

13 . The garden blower according to claim 12 , wherein a ratio of the weight of the first assembly to a total weight of the garden blower in which the battery pack is mounted is not greater than 0.5.

14 . The garden blower according to claim 12 , wherein the weight of the first assembly is less than or equal to 1.2 kg.

15 . The garden blower according to claim 1 , wherein the air duct portion comprises a main air blowing tube and an auxiliary air blowing tube disposed in communication with the main air blowing tube, the air inlet is formed on an end of the main air blowing tube, and the other end of the main air blowing tube is provided with a main air blowing port opposite to the air inlet, the auxiliary air blowing tube is provided with an auxiliary air inlet in communication with the main air blowing port and a nozzle located on a front end of the auxiliary air inlet in the longitudinal direction, the nozzle forms the air outlet, and there is a gap between the main air blowing port and the auxiliary air inlet, so that an external airflow can enter the auxiliary air blowing tube from the gap.

16 . The garden blower according to claim 15 , wherein an airflow diffused from the air inlet to the air outlet comprises a high-speed region surrounding a rotation axis of the fan and a low-speed region on a periphery of the high-speed region, the high-speed region flowing outward from the air outlet is defined as a high-speed wake region, and a ratio of a length of the high-speed wake region that extends outward beyond the air outlet to a length of the auxiliary air blowing tube is set to between 1.1 and 1.5 based on configurations that a rotational speed of the motor is higher than 35000 rpm and lower than or equal to 120000 rpm, and the length of the auxiliary air blowing tube is greater than or equal to 100 mm and less than or equal to 160 mm.

17 . The garden blower according to claim 15 , wherein the garden blower has a first operating mode in which external air enters from the air inlet and is blown outward from the main air blowing port and a second operating mode in which external air enters from the air inlet and is blown outward from the air outlet, the garden blower selectively operates in the first operating mode or the second operating mode, the garden blower can provide an air speed not lower than 130 mph in the first operating mode, and the garden blower can provide an air volume not less than 300 cfm in the second operating mode.

18 . The garden blower according to claim 1 , wherein the garden blower comprises an accommodating portion and a control board that is electrically connected to the motor and that is placed inside the accommodating portion, the accommodating portion and the air duct portion are spaced apart in the longitudinal direction, the accommodating portion comprises a heat dissipation airflow inlet and a heat dissipation airflow outlet that are in airflow communication, the heat dissipation airflow outlet is in communication with the air duct portion, and a projection of the control board on a plane perpendicular to an axial direction of the fan is located within a range of a projection of the air inlet on the plane perpendicular to the

Assignees

• Positec Power Tools Suzhou Co Ltd

Inventors

• Liu Zhengwei
• Jiao Shiping
• Xiao Haibo
• Yu Xuefeng
• Yang Qinghui

Classifications

• F04D29/5813

  Cooling the control unit · CPC title

• E01H1/0809

  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

• F04D25/08 Primary

  the working fluid being air, e.g. for ventilation · CPC title

• H02K5/207

  with openings in the casing specially adapted for ambient air · CPC title

• A01G20/47 Primary

  Vacuum or blower devices · CPC title