A handheld blower includes a housing, the housing including an air inlet and a duct assembly, the duct assembly including a duct, a motor and a fan mounted in the duct, a battery, a handle, and a blowpipe which defines a central axis. Along the direction of the central axis, the area of the flowing
A handheld blower includes a housing, the housing including an air inlet and a duct assembly, the duct assembly including a duct, a motor and a fan mounted in the duct, a battery, a handle, and a blowpipe which defines a central axis. Along the direction of the central axis, the area of the flowing cross-section of an air passage at the rear end of the fan adjacent to the air inlet is larger than that of the flowing cross-section of an air outlet of the blowpipe, and the rate between the area of the flow cross-section of the air outlet of the blowpipe and the area of the flow cross-section of the flow-through area at the position of the fan is greater than or equal to 0.8.
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1. A handheld blower, comprising: a housing, the housing comprising an air inlet and a duct assembly, the duct assembly comprising a duct connected with the housing, a motor and a fan mounted in the duct;a handle comprising a gripping portion;a blowpipe connected to the housing by the duct assembly
1. A handheld blower, comprising: a housing, the housing comprising an air inlet and a duct assembly, the duct assembly comprising a duct connected with the housing, a motor and a fan mounted in the duct;a handle comprising a gripping portion;a blowpipe connected to the housing by the duct assembly wherein the blowpipe defines a central axis and along the direction of the central axis an air passage having an air outlet at an end of the blowpipe, wherein the fan is adapted to cause an operational airflow from the air inlet of the housing to the air outlet of the blowpipe;a supporting ring operably mounted to the duct, the supporting ring comprising an accommodating portion for accommodating the motor and an air guiding portion, the air guiding portion, which is arranged on one end of the supporting ring adjacent to the blowpipe, being a substantially tapered structure, a rear end of the air guiding portion of the accommodating portion defining an air intake opening for allowing a cooling airflow to pass therethrough and a front end of the accommodating portion defining an air outlet opening for allowing cooling airflow to pass therethrough, wherein the air intake opening and the air outlet opening are in fluid communication through the accommodating portion,wherein a pressure differential between air outside the accommodating portion and inside the accommodating portion cause the cooling airflow into the air intake opening, in an opposite direction of the operational airflow, past the motor within the accommodating portion, and out of the air outlet opening thereby cooling the motor,wherein the gripping portion is symmetrically arranged on opposite sides of a plane in which a gravity center of the blower is located, the housing, the duct assembly and the blowpipe are substantially arranged along the same line, the housing having an accommodating, chamber and a bending portion for turning the operational airflow, and the handle is arranged on the bending portion of the housing,wherein the air inlet comprises a main air inlet, a secondary air inlet and a side air inlet, the main air inlet and the secondary air inlet are arranged on the bottom of the housing, and the side air inlet is arranged on the side wall of the housing; andfurther comprising an air intake box arranged in the accommodating chamber of the housing, the air intake box being connected with the duct assembly to form an independent working unit, the air intake box comprising a bottom air intake portion, a rear air intake portion, a side air intake portion and an air outlet, the bottom air intake portion and the side air intake portion each being configured as a grille structure, the rear air intake portion including an inclined surface corresponding to the bending portion of the housing, the main air inlet of the housing, the bottom air intake portion and the air outlet cooperatively defining a first blowing passage, the secondary air inlet of the housing, the rear air intake portion and the air outlet cooperatively defining a second blowing passage, and the side air inlet of the housing, the side air intake portion and the air outlet cooperatively defining a third blowing passage. 2. The handheld blower according to claim 1, wherein the housing defines two hanging holes having generally the same distance from a center of the handle, and the handheld blower further comprises a strap with two ends connected into the two hanging holes respectively. 3. The handheld blower according to claim 1, wherein a plurality of radial air guiding ribs are arranged between the duct and the supporting ring, and at least one of the air guiding ribs defines a channel for wires of the motor to pass through. 4. The handheld blower according to claim 3, wherein the duct assembly further comprises a connecting pipe for locking with the duct, the connecting pipe is connected with the blowpipe, the air guiding ribs are partially extending between the connecting pipe and the supporting ring, and each of the air guiding ribs has one end connected to an inner wall of the connecting pipe or the duct and another end connected to the supporting ring. 5. The handheld blower according to claim 4, wherein the air guiding portion is integrally formed with the accommodating portion as one piece. 6. The handheld blower according to claim 1, wherein an air passage between the fan and the air outlet defines an outer contour line, the outer contour line and the central axis cooperatively define an angle less than or equal to 8° relative to the central axis, and the area of the cross-section of the air outlet of the blowpipe is greater than 4300 mm2. 7. The handheld blower according to claim 1, wherein the operational airflow of the handheld blower has an airflow rate in the range from 430 cfm to 700 cfm and a working time longer than 5 min. 8. The handheld blower according to claim 1, wherein the ratio of the operational airflow rate to the power to the motor is larger than or equal to 0.7 cfm/w when the handheld blower is operated at a maximum operational airflow rate. 9. The handheld blower according to claim 1, wherein the handheld blower comprises a battery mounted on the housing for powering the motor, the battery having a capacity larger than 170 wh. 10. The handheld blower according to claim 9, wherein the battery has a capacity in the range from 170 wh to 400 wh, and wherein the operational airflow rate of the handheld blower is in the range from 430 cfm to 700 cfm and a working time of the handheld blower is longer than 5 min. 11. The handheld blower according to claim 9, wherein the handle is arranged above the housing and the battery, a battery mounting portion being provided for installing or uninstalling the battery, and a speed adjusting portion, the handle comprises a gripping portion and the speed adjusting portion arranged adjacent to the gripping portion, and a speed adjusting button is arranged on the speed adjusting portion. 12. A handheld blower, comprising: a housing, the housing comprising an air inlet and a duct assembly, the duct assembly comprising a duct connected with the housing, a motor and a fan mounted in the duct to cause an airflow from an air inlet of the duct to an air outlet of the duct, and the fan being connected to the motor;a blowpipe, connected to the housing by the duct;the duct provided with a supporting ring, the supporting ring comprising an accommodating portion for accommodating the motor and an air guiding portion, the air guiding portion which is arranged on one end of the supporting ring adjacent to the blowpipe being a substantially tapered structure, a rear end of the air guiding portion of the accommodating portion defining an air intake opening for allowing a cooling airflow to pass therethrough and a front end of the accommodating portion defining an air outlet opening for allowing cooling airflow to pass therethrough, wherein the air intake opening and the air outlet opening are in fluid communication through the accommodating portion,wherein a pressure differential between air outside the accommodating portion and inside the accommodating portion cause the cooling airflow into the air intake opening, in an opposite direction of the operational airflow, past the motor within the accommodating portion, and out of the air outlet opening thereby cooling the motor; andan air intake box arranged in an accommodating chamber of the housing, the air intake box being connected with the duct assembly to form an independent working unit, the air intake box comprising a bottom air intake portion, a rear air intake portion, a side air intake portion and an air outlet, the bottom air intake portion and the side air intake portion each being configured as a grille structure, the rear air intake portion including an inclined surface corresponding to a bending portion of the housing, a first portion of the air inlet of the housing, the bottom air intake portion and the air outlet cooperatively defining a first blowing passage, a secondary air inlet of the housing, the rear air intake portion and the air outlet cooperatively defining a second blowing passage, and a side air inlet of the housing, the side air intake portion and the air outlet cooperatively defining a third blowing passage. 13. The handheld blower according to claim 12, wherein the motor is a brushless DC motor having a diameter less than or equal to 35 mm, and a ratio of the airflow rate of the handheld blower to a diameter of the brushless DC motor is larger than 12 cfm/mm. 14. The handheld blower according to claim 12, wherein along a direction of a central axis of the blowpipe, an area of a flow cross-section of an air passage at a rear end of the fan adjacent to an air inlet is greater than that of the flow cross-section at an air outlet of the blowpipe, and a flow-through area is formed between an inner wall of the housing and a hub of the fan, and wherein a ratio between an area of a flowing cross-section of the air outlet of the blowpipe and an area of the flow cross-section of the flow-through area at the position of the fan is greater than or equal to 0.8. 15. The handheld blower according to claim 12, wherein the housing, the duct assembly and the blowpipe are substantially arranged along the same line, the handheld blower further comprises a handle arranged above the housing and a battery, the handle comprises a gripping portion, arranged on opposite sides of a plane in which a gravity center of the whole blower is located, and the plane is parallel to a central axis defined by the blowpipe and substantially perpendicular to a working ground. 16. The handheld blower according to claim 15, wherein the handle is arranged on the bending portion of the housing. 17. The handheld blower of claim 1, wherein an area of a flowing cross-section of the air passage at a rear end of the fan adjacent to the air inlet is greater than that of a flowing cross-section of the air outlet of the blowpipe, and wherein a flow-through area formed between an inner wall of the housing and a hub of the fan, and a ratio between an area of a flow cross-section of the air outlet of the blowpipe and an area of a flow cross-section of the flow-through area at the position of the fan is greater than or equal to 0.8.
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이 특허에 인용된 특허 (17)
Levin Mark R. (10032 Beacon Pond La. Burke VA 22015), Air blower.
Moren Lars G. (Huddinge SEX) Wiss Christer C. I. (Lidingo SEX) Lindmark Magnus C. W. (Stockholm SEX), Device for a vacuum cleaner and a method for cooling a motor.
Lopic Franz (Nersingen DEX) Katzer Johann (Neu-Ulm DEX) Lindermeir Wolfgang (Untermarchtal DEX), Electric power supply assembly for a cordless electric appliance.
Miner Jonathan L. (Timonium MD) Lacher Vernon R. (Fallston MD) Rescigno Gerald J. (Baltimore MD) Swim William B. (Cookeville TN) Gierke Martin P. (Baltimore MD) Hahn David A. (Baltimore MD), Portable blower.
Steinberg Gary L. (Jenison MI) Pino Giovanni (Grand Rapids MI) Gibbs Kenneth E. (Wyoming MI) Norwood Richard L. (Rockford MI) Smith Gary L. (Belding MI), Vacuum cleaner.
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