US-12624703-B2 - Blower

US12624703B2US 12624703 B2US12624703 B2US 12624703B2US-12624703-B2

Abstract

A blower includes: a housing, having an air inlet end and an air outlet end; and a duct assembly disposed in the housing and located between the air inlet end and the air outlet end. The duct assembly includes an outer duct and a motor fan blade assembly disposed in the outer duct. The motor fan blade assembly includes a first motor fan blade assembly and a second motor fan blade assembly; the first motor fan blade assembly includes a first fan blade and a first motor that drives the first fan blade to rotate about a first output axis of the first motor; the second motor fan blade assembly includes a second fan blade and a second motor that drives the second fan blade to rotate about a second output axis of the second motor; and the first output axis is parallel to the second output axis.

Inventors

Yabin TANG
Yunjie Shangguan

Assignees

Greenworks (Jiangsu) Co., Ltd

Dates

Publication Date: 20260512
Application Date: 20240307
Priority Date: 20210914

Claims (17)

1 . A blower, comprising: a housing, having an air inlet end and an air outlet end; and a duct assembly disposed in the housing, and the duct assembly is located between the air inlet end and the air outlet end, wherein the duct assembly comprises an outer duct and a motor fan blade system, and the motor fan blade system is disposed in the outer duct; the motor fan blade system comprises a first motor fan blade assembly and a second motor fan blade assembly; the first motor fan blade assembly comprises a first motor and a first fan blade, and the first motor drives the first fan blade to rotate about a first output axis of the first motor; the second motor fan blade assembly comprises a second motor and a second fan blade, and the second motor drives the second fan blade to rotate about a second output axis of the second motor; and the first output axis is parallel to the second output axis; wherein the blower further comprises a blowpipe, the blowpipe is connected to the air outlet end, and the blowpipe has a first air guide channel and a second air guide channel that are independent of each other; the first motor fan blade assembly communicates with the first air guide channel for allowing air generated by the first motor fan blade assembly to flow along the first air guide channel; and the second motor fan blade assembly communicates with the second air guide channel for allowing air generated by the second motor fan blade assembly to flow along the second air guide channel; wherein the blower further comprises a nozzle, the nozzle has a connection end and an air outlet opposite to the connection end, the connection end of the nozzle is connected to an end of the blowpipe away from the outer duct, and the nozzle is configured to converge the air flown out from the first air guide channel and the second air guide channel and then flow out the air through the air outlet; wherein the air outlet is divided into two independent sub-outlets, and each sub-outlet communicates with one of the air guide channels.
2 . The blower according to claim 1 , wherein the first motor fan blade assembly is disposed in the outer duct side-by-side with the second motor fan blade assembly.
3 . The blower according to claim 1 , wherein the first and second air guide channels are disposed in parallel.
4 . The blower according to claim 1 , wherein the air outlet comprises a shape formed by joining endpoints of two equal-radius major arcs.
5 . The blower according to claim 1 , wherein each of the first and second motor fan blade assemblies further comprises an inner duct, and the inner duct is disposed in the outer duct.
6 . The blower according to claim 5 , wherein each of the first and second motor fan blade assemblies further comprises a guiding cone, and the guiding cone is mounted at an end of the respective inner duct closer to the air outlet end.
7 . The blower according to claim 1 , wherein the motor fan blade system further comprises a third motor fan blade assembly, the third motor fan blade assembly comprises a third motor and a third fan blade, the third motor drives the third fan blade to rotate about a third output axis of the third motor, and the third output axis is parallel to the first output axis and the second output axis.
8 . The blower according to claim 7 , wherein the third motor fan blade assembly is disposed in parallel with the first motor fan blade assembly and the second motor fan blade assembly.
9 . The blower according to claim 7 , wherein the duct assembly further comprises a fastening base, and the first, second, and third motor fan blade assemblies are fastened in the outer duct by the fastening base.
10 . The blower according to claim 7 , wherein the blowpipe has the first air guide channel, the second air guide channel, and a third air guide channel that are independent of each other; and the third motor fan blade assembly communicates with the third air guide channel for allowing airflow generated by the third motor fan blade assembly to flow along the third air guide channel.
11 . The blower according to claim 10 , wherein the blowpipe is formed by connecting three pipe bodies disposed in parallel, and a cavity of each pipe body is used as one of the air guide channels.
12 . The blower according to claim 10 , wherein the nozzle is configured to converge the air flown out from the first air guide channel, the second air guide channel, and the third air guide channel and then flow out the air through the air outlet.
13 . The blower according to claim 1 , wherein the housing comprises a first housing and a second housing, the first housing and the second housing interlock to form an accommodation cavity, and the duct assembly is disposed in the accommodation cavity.
14 . The blower according to claim 13 , wherein an air cover is disposed at the air inlet end, the air cover comprises a first air cover and a second air cover, the first air cover is disposed on the first housing, and the second air cover is disposed on the second housing.
15 . The blower according to claim 1 , wherein the blowpipe has a first end connected to the air outlet end of the housing, and a second end connected to the nozzle.
16 . The blower according to claim 1 , wherein the blower further comprises an air guide cylinder disposed in the housing, the air guide cylinder is located between the air inlet end and the outer duct, and the air guide cylinder is connected to an end of the outer duct closer to the air inlet end.
17 . The blower according to claim 16 , wherein the air guide cylinder is horn-shaped, and a cross-sectional area of an opening at an end of the air guide cylinder closer to the air inlet end is greater than a cross-sectional area of an opening at an end of the air guide cylinder closer to the air outlet end.

Description

CROSS REFERENCE TO RELATED APPLICATION The present application is a continuation application of PCT Application No. PCT/CN2022/115775, filed on Aug. 30, 2022, which claims the benefit of priority to a Chinese Patent Application number CN202122229544.3, filed on Sep. 14, 2021, and a Chinese Patent Application number CN202122228456.1, filed on Sep. 14, 2021, the disclosure of the above applications is hereby incorporated by reference in their entireties for all purposes. TECHNICAL FIELD The present disclosure relates to the technical field of garden tools, and in particular, to a blower. BACKGROUND A blower is a common garden tool, and is mainly used to blow and clear debris such as leaves, road dust, water, and snow. An existing blower generally uses a combination of a single motor and a single fan blade. To ensure wind force and an air volume, a large fan blade is generally used. Due to the large fan blade, a requirement of providing a high wind speed and a high air volume at a high rotational speed cannot be met, and the large fan blade has poor stability, a high dynamic balance requirement, and large working noise. SUMMARY The present disclosure provides a blower, to resolve technical problems in the conventional technology that a blower using a large fan blade cannot meet a requirement of providing a high wind speed and a high air volume at a high rotational speed, and the large fan blade has poor stability, a high dynamic balance requirement, and large working noise. The present disclosure provides a blower, including: a housing, having an air inlet end and an air outlet end; anda duct assembly, where the duct assembly is disposed in the housing, and the duct assembly is located between the air inlet end and the air outlet end, wherethe duct assembly includes an outer duct and a motor fan blade assembly, and the motor fan blade assembly is disposed in the outer duct;the motor fan blade assembly includes a first motor fan blade assembly and a second motor fan blade assembly;the first motor fan blade assembly includes a first motor and a first fan blade, and the first motor drives the first fan blade to rotate about a first output axis of the first motor;the second motor fan blade assembly includes a second motor and a second fan blade, and the second motor drives the second fan blade to rotate about a second output axis of the second motor; andthe first output axis is parallel to the second output axis. In an optional embodiment, the first motor fan blade assembly is disposed in the outer duct side-by side with the second motor fan blade assembly. In an optional embodiment, the blower further includes a blowpipe, the blowpipe is connected to the air outlet end, and the blowpipe has a first air guide channel and a second air guide channel that are independent of each other; the first motor fan blade assembly communicates with the first air guide channel for allowing air generated by the first motor fan blade assembly to flow along the first air guide channel; and the second motor fan blade assembly communicates with the second air guide channel for allowing air generated by the second motor fan blade assembly to flow along the second air guide channel. In an optional embodiment, the blowpipe has two air guide channels disposed in parallel, and each air guide channel corresponds to one of the motor fan blade assemblies. In an optional embodiment, the blower further includes a nozzle, the nozzle has a connection end and an air outlet opposite to the connection end, the connection end of the nozzle is connected to an end that is of the blowpipe and that is away from the outer duct, and the nozzle is configured to converge the air flown out from the first air guide channel and the second air guide channel and then flow out the air through the air outlet. In an optional embodiment, a shape of the air outlet includes a circular hole, an oblong hole, or a shape formed by joining end points of two equal-radius major arcs. In an optional embodiment, the air outlet is divided into two independent sub-outlets, and each sub-outlet communicates with one of the air guide channels. In an optional embodiment, the motor fan blade assembly further includes an inner duct, and the inner duct is disposed in the outer duct. In an optional embodiment, the motor fan blade assembly further includes a guiding cone, and the guiding cone is mounted at an end that is of the inner duct and that is close to the air outlet end. In an optional embodiment, the motor fan blade assembly further includes a third motor fan blade assembly, the third motor fan blade assembly includes a third motor and a third fan blade, the third motor drives the third fan blade to rotate about a third output axis of the third motor, and the third output axis is parallel to the first output axis and the second output axis. In an optional embodiment, the third motor fan blade assembly is disposed in parallel with the first motor fan blade assembly and the second