Garden blower

Patent metadata

Field	Value
Publication number	US-11346352-B2
Application number	US-201916270372-A
Country	US
Kind code	B2
Filing date	Feb 7, 2019
Priority date	Aug 10, 2016
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

The embodiments relates to garden blower, including: an enclosure, including a main body part located on back end and a blowing pipe located on front end and extending axially, the enclosure disposed with an air inlet and an air outlet communicated with external environment; a power device, connected to the enclosure; a fan component, driven by the power device and generating airflows; the fan component includes at least two-level fans, further includes a first-level fan and a second-level fan axially disposed front and back, the garden blower includes a first air inlet passage allowing entrance of the airflows generated by the first-level fan and a second air inlet passage allowing entrance of the airflows generated by the second-level fan, and the airflows entering the first air inlet passage and the airflows entering the second air inlet passage are converged into the blowing pipe and are blown to the outside.

First claim

What is claimed is:

1. A garden blower, comprising:
an enclosure, comprising a main body part located on a back end and a blowing pipe located on a front end of the main body part and extending axially, the enclosure being further disposed with at least one air inlet and an air outlet communicated with an external environment;
a power device, connected to the enclosure to provide power for the garden blower;
a fan component, driven by the power device to rotate and generating airflows comprising first airflows and second airflows;
wherein the fan component comprises at least two groups of fans, the at least two groups of fans comprise a first-level fan and a second-level fan axially disposed in front of the first-level fan towards the air outlet, the garden blower comprises a first air inlet passage allowing entrance of the first airflows generated by the first-level fan and a second air inlet passage allowing entrance of the second airflows generated by the second-level fan, and the first airflows entering the first air inlet passage and the second airflows entering the second air inlet passage are converged into the blowing pipe and are blown to an outside of the blowing pipe from the air outlet;
wherein the enclosure comprises a first group of the at least one air inlet introducing the first airflows into the blowing pipe, when the garden blower is in a working state, the first airflows enter the blowing pipe from the first group of the at least one air inlet, and the first air inlet passage is formed between the first group of the at least one air inlet and the first-level fan;
wherein the enclosure further comprises a second group of the at least one air inlet allowing the second airflows to enter the blowing pipe, when the garden blower is in a working state, the second airflows enter the blowing pipe from the second group of the at least one air inlet, and the second air inlet passage is formed between the second group of the at least one air inlet and the second-level fan;
wherein the enclosure further comprises a first duct part guiding the first airflows into the blowing pipe, and when the garden blower is in the working state, the first airflows entering from the first group of the at least one air inlet flow into the blowing pipe from the first duct part, the first-level fan is disposed in the first duct part, and at least part of a region of the first air inlet passage is formed in an inner cavity defined by the first duct part;
wherein the enclosure further comprises a second duct part guiding the second airflows into the blowing pipe, and when the garden blower is in the working state, the second airflows entering from the second group of the at least one air inlet flow into the blowing pipe from the second duct part, the second-level fan is disposed in the second duct part, and at least part of a region of the second air inlet passage is formed between an inner wall of the second duct part and an outer wall of the first duct part; and
wherein a front end of the first duct part is axially spaced from the second-level fan, at least part of the first airflows entering the first air inlet passage and at least part of the second airflows entering the second air inlet passage are converged between the first-level fan and the second-level fan, and blown into the blowing pipe from the second-level fan.

2. The garden blower according to claim 1 , wherein the first-level fan is disposed further away from the air outlet compared with the second-level fan, and a sectional area of the first-level fan in a radial direction is smaller than a sectional area of the second-level fan in a radial direction, the first-level fan and the second-level fan are both an axial flow fan.

3. The garden blower according to claim 1 , wherein the first group of the at least one air inlet and the second group of the at least one air inlet are axially separated front and back, the first group of the at least one air inlet and the second group of the at least one air inlet are both located behind the first-level fan.

4. The garden blower according to claim 1 , wherein in a direction perpendicular to the axial direction, at least part of a region of the second air inlet passage is annularly disposed on the periphery of at least part of a region of the first air inlet passage.

5. The garden blower according to claim 1 , wherein the first air flows entering the first air inlet passage are generated by both of the first-level fan and the second-level fan, and the second airflows entering the second air inlet passage are generated by the second-level fan only.

6. The garden blower according to claim 1 , wherein the first duct part comprises a first interface part penetrating in the axial direction and a second interface part opposite to the first interface part, the first interface part is communicated with the first group of the at least one air inlet, the second interface part is disposed between the first-level fan and the second-level fan, and a sectional area of the second interface part in a radial direction is smaller than a sectional area of the second-level fan in a radial direction.

7. The garden blower according to claim 1 , wherein the first-level fan and the second-level fan comprise a hub and a plurality of blades disposed around the hub in a peripheral direction, and at least one of the number of the blades, a rotary outer diameter of the blades and a rotary inner diameter of the blades of the first-level fan is different from the number of the blades, a rotary outer diameter of the blades and a rotary inner diameter of the blades of the corresponding second-level fan.

8. The garden blower according to claim 7 , wherein the absolute value range of a difference value between the rotary outer diameter of the first-level fan and the rotary outer diameter of the second-level fan is 10 mm-90 mm; a difference value absolute value between the rotary inner diameter of the blades of the first-level fan and the rotary inner diameter of the blades of the second-level fan is smaller than or equal to 50 mm; a hub ratio of the first-level fan is 0.55-0.85, and a hub ratio of the second-level fan is 0.5-0.8; the difference between the number of the blades of the first-level fan and the number of the blades of the second-level fan is 1-9.

9. The garden blower according to claim 1 , wherein the garden blower comprises a first-level guide blade corresponding to the first-level fan and a second-level guide blade corresponding to the second-level fan, the first-level fan and the second-level fan both have an air inlet side and an air outlet side, the first-level guide blade is located on the air outlet side of the first-level fan and the second-level guide blade is located on the air outlet side of the second-level fan.

10. The garden blower according to claim 1 , wherein the power device comprises a motor, the blowing pipe is disposed with a central axis, the motor drives the first-level fan and the second-level fan to rotate around the central axis.

11. A garden blower, comprising:
an enclosure, comprising a main body part located on a back end and a blowing pipe located on a front end of the main body part and extending axially, the enclosure being further disposed with at least one air inlet and an air outlet communicated with an external environment;
a power device, connected to the enclosure to provide power for the garden blower;
a fan component, driven by the power device to rotate and generating airflows comprising first airflows and second airflows;
wherein the fan component comprises at least two groups of fans, the at least two groups of fans comprise a first-level fan and a second-level fan axially disposed in front of t

Assignees

• Positec Power Tools Suzhou Co Ltd

Inventors

• Liu Zhengwei
• Jiao Shiping
• Liu Jiabo
• Yu Xuefeng
• Wong Ka Tat Kelvin
• Zha Xiahong
• Zhao Fengli

Classifications

• 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

• F04D19/007

  multistage fans · CPC title

• E01H1/08

  Pneumatically dislodging or taking-up undesirable matter {or small objects}({E01H1/006 and E01H1/005 take precedence;} suction cleaners in general A47L5/00 - A47L9/00; {sucking-off liquids or semi-liquids E01H1/108}); Drying by heat only or by streams of gas (permanently-installed heating or blowing devices E01C11/26; heating or drying for road- building or repairing E01C23/14; {devices for melting snow or ice in situ E01H5/10, E01H8/08; for scorching undesirable vegetation E01H11/00}); Cleaning by projecting abrasive particles (sand-blasting in general B24C; {roughening of road surfaces E01C23/08; cleaning of road joints E01C23/0906}) · CPC title

• F04D25/08 Primary

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