WO2016082796A1 - Air blower and blower/vacuum apparatus - Google Patents

Abstract

An air blower comprising: a housing (200), where an air inlet (203) is provided on the housing (200) and air is introduced via the air inlet (203); a motor (300) arranged within the housing (200); an axial flow fan driven by the motor (300) to rotate around a fan axis and to produce an airflow; an air blowing pipe (422) connected to the housing (200) and provided with an air outlet (601), where the airflow is blown out from the air outlet (601); and a duct (400) used for guiding the airflow to move towards the air outlet (601). An airflow channel (602) is provided within the housing (200) and the air blowing pipe (422). The airflow channel (602) comprises an upstream area(201) between the air inlet (203) and the axial flow fan and a downstream area (202) between the axial flow fan and the air outlet. The motor (300) is provided in the upstream area (201). The duct (400) is provided in the downstream area (202).

Description

Hair dryer and suction device Technical field

The present invention relates to a hair dryer, and to a suction device having a blowing and suction function.

Background technique

Hair dryers are a common tool in everyday life and are often used to clean floors such as gardens or streets.

No. 4,880,364 discloses a hair dryer comprising a housing, a motor, a fan and a duct. The fan rotates to create an airflow that blows out of the air duct. However, the fan of the hair dryer uses a centrifugal fan, the air inlet is arranged in the direction of the rotation axis of the centrifugal fan, and the air outlet is arranged in the radial direction of the centrifugal fan. Due to the limitation of the structure of the centrifugal fan itself, the air volume blown by the blower is often not large, so the blowing effect is not good, and the user's demand cannot be satisfactorily met.

For example, U.S. Patent No. 5,975, 862 discloses an engine-powered hair dryer that uses gasoline as a fuel and the fan still uses a centrifugal fan. However, since the power of the engine is larger than that of a general motor, it can drive the centrifugal fan to rotate at a higher rotational speed, thereby outputting a larger air volume and a wind speed, thereby satisfying the user's needs to some extent. However, since the blower using a gasoline engine tends to have a relatively large working noise and is powered by gasoline, it is easy to form air pollution and is not environmentally friendly.

No. 7,773,773 discloses a hair dryer comprising a housing, an engine, a fan and a duct. The fan becomes an axial fan. The engine is still powered by gasoline, and the axial fan is driven by the transmission mechanism. However, the engine is arranged outside the casing, so that the engine is far away from the fan, which means that the entire hair dryer is large in size, and the engine is relatively bulky, which does not conform to the trend of portable and lightweight. Moreover, the engine's power source is still gasoline, which is easy to pollute the atmosphere.

Another example is the hair dryer on the market. The motor is located inside the housing for driving the fan to rotate. The air duct includes an air inlet and an air outlet, and air enters from the air inlet and is blown out from the air outlet. In order to blow a large air volume to the air outlet, the fan is preferably an axial fan. There is also a duct in the air duct that guides the flow of the airflow formed by the axial fan. In order to keep the blower in a compact structure, the motor is placed in the duct. Since the motor itself has a certain size, the duct must also be set to a sufficient size to accommodate the motor. However, the drawback is that the efficiency of the entire hair dryer is reduced.

Therefore, it is necessary to improve the existing technical means.

Summary of the invention

In view of the above, it is an object of the present invention to provide a hair dryer that achieves both size and air blowing efficiency.

In order to achieve the above object, the technical solution adopted by the present invention is: a hair dryer comprising: a casing, the casing is provided with an air inlet, air is introduced from the air inlet; and a motor is located inside the casing; An axial flow fan, driven by the motor to rotate along a fan axis and generate an air flow; a blowing pipe connecting the casing and having an air outlet, the airflow is blown out from the air outlet; and a duct is used to guide the airflow direction Determining the tuyere movement; wherein the housing and the blowing pipe have an air flow passage therein, the air flow passage including an upstream region from the air inlet to the axial fan and from the axial fan to the In a downstream region between the air outlets, the motor is disposed in the upstream region, and the duct is disposed in the downstream region.

Preferably, the air inlet, the motor, the axial fan and the duct are sequentially arranged in the longitudinal direction.

Preferably, the air inlet and the air outlet at least partially coincide with a projection on a plane perpendicular to the fan axis.

Preferably, the airflow passage includes a plurality of windward surfaces perpendicular to a direction in which the airflow flows, and an area of the minimum windward surface of the upstream region is larger than an area of a rotating surface formed by rotation of the blades of the axial fan.

Preferably, the upstream region includes a surrounding area disposed around the motor, and a ratio of an area of a minimum windward surface of the surrounding area to an area of a rotating surface formed by rotation of a blade of the axial fan is in a range of 1.5 Between 2.5.

Preferably, the upstream region includes a transition region between the motor and the axial fan in a longitudinal direction, and an inner wall of the housing in which the transition region is located is a smooth curved surface.

Preferably, the ratio of the area of the minimum windward surface of the transition region to the area of the rotating surface formed by the rotation of the blades of the axial fan ranges between 1.5 and 2.5.

Preferably, the longitudinal distance between the axial fan and the motor is 20 to 30 mm.

Preferably, the hair dryer further includes a support structure for supporting the motor, the support structure including an outer ring fixedly connecting the housing, an inner ring for fixing the motor, and connecting the inner ring and the outer ring Several support members of the ring.

Preferably, the plurality of supports extend radially and adjacent one of the plurality of supports is provided with a flow area through which the airflow passes.

Preferably, the inner ring has a central bore through which the motor shaft passes and ribs extending radially from the central bore.

Preferably, the ratio of the cross-sectional area of the motor in the longitudinal direction to the cross-sectional area of the air flow passage in the longitudinal direction is 0.6 to 0.7.

Preferably, the air inlet is provided with a detachable safety shield.

Preferably, the safety shield is provided with a labyrinth passage such that the air enters the interior of the housing along the curved travel path.

Preferably, the labyrinth channel includes a longitudinally extending first channel and a second channel disposed at an angle to the first channel.

In order to achieve the above object, the present invention further includes a technical solution: a blowing device, optionally operating in a blowing mode or a suction mode, comprising: a housing having an air inlet, air from The air inlet enters; the motor is located inside the casing; the axial fan is driven by the motor to rotate along a fan axis to generate airflow; the air blowing component and the air suction component are connectable to the casing; In the mode, the blowing assembly is coupled to the housing, the axial fan rotates, and in the suction mode, the suction assembly is coupled to the housing; wherein the blowing assembly includes a blowing tube and a duct. The blowing pipe may be connected to the casing and have an air outlet, the airflow is blown out from the air outlet; the duct is used to guide the airflow to move to the air outlet, the casing and the air blowing An air flow passage is included in the tube, the air flow passage includes an upstream region from the air inlet to the axial fan, and a downstream region from the axial fan to the air outlet, and the motor is disposed in the upstream region. The culvert Disposed downstream of said region.

In order to achieve the above object, the present invention further includes a technical solution: a hair dryer comprising: a housing having an air inlet, air entering from the air inlet; and a motor located inside the housing An axial fan driven by the motor to rotate along a fan axis to generate an air flow; a blowing pipe connecting the casing and having an air outlet, the airflow is blown out from the air outlet; and a duct is provided for guiding the airflow The air outlet moves; wherein the motor is disposed outside the duct.

In order to achieve the above object, the present invention further includes a technical solution: a hair dryer comprising: a housing having an air inlet, air entering from the air inlet; and a motor located inside the housing An axial fan driven by the motor to rotate along a fan axis to generate an air flow; a blowing pipe connecting the casing and having an air outlet, the airflow is blown out from the air outlet; and a duct is provided for guiding the airflow The air outlet moves; the motor and the duct are respectively disposed on two sides of the axial fan.

Compared with the prior art, the beneficial effects of the invention are: the motor is arranged in the upstream region, and the duct is set In the downstream area, the choice of motor can be limited by the size of the duct, which further improves the blowing efficiency, and the motor is located in the air duct, which has a good heat dissipation effect. Moreover, the structure in which the motor is arranged is such that the overall size of the blower or the suction device is small.

In order to overcome the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a hair dryer that is comfortable to operate and reduces fatigue.

In order to solve the above technical problem, the first technical solution provided by the present invention is: a hair dryer comprising: a housing having an air inlet, the air entering from the air inlet; the handle being disposed at the a housing; a motor located inside the housing; a fan driven by the motor to rotate and generate an air flow; a blowing tube connecting the housing and having an air outlet, the air flow being blown out from the air outlet; The handle has a grip for operation by an operator, the blow tube extends longitudinally along a first axis, the grip extends longitudinally along a second axis, the first axis and the second axis defining a first plane a projection of a center of gravity of the blower on a second plane within a projection range of the grip on a second plane, the second plane being parallel to the second axis and perpendicular to the first plane .

Compared with the prior art, the hair dryer of the present invention generally has a second axis of the grip portion substantially parallel to the horizontal plane when the grip portion is gripped, and the center of gravity of the blower is projected on the second plane. Located within the projection range of the grip on the second plane, the operator does not need to additionally overcome the force of the blower deflection, the operation is very comfortable, and the fatigue of long working hours is avoided.

Preferably, the first axis forms an angle with the second axis of no more than 25 degrees.

Preferably, the first axis forms an angle of 10 degrees with the second axis.

Preferably, when the first axis forms an angle of not more than 25 degrees with the horizontal plane, the projection of the center of gravity of the blower on the horizontal plane is within the projection range of the grip portion on the horizontal plane.

Preferably, when the first axis is at an angle of 10 degrees from the horizontal plane, the projection of the center of gravity of the blower on the horizontal plane is within the projection range of the grip on the horizontal plane.

Preferably, the center of gravity of the blower is located between the fan and the motor.

Preferably, the projection of the center of gravity of the blower on the second plane is within the projection range of the motor on the second plane.

Preferably, the projection of the motor on the second plane at least partially overlaps the projection of the grip on the second plane.

Preferably, the fan is provided as an axial fan.

Preferably, the hair dryer further includes a duct for guiding the airflow to move to the air outlet, the casing and the blowing pipe have an air flow passage therein, and the air flow passage includes the air inlet to the axial flow An upstream region of the fan and a downstream region from the axial fan to the air outlet, the motor is provided Placed in the upstream region, the duct is disposed in the downstream region.

Preferably, the hair dryer further includes a battery pack disposed on the casing or the handle, the battery pack being electrically connected to the motor.

Preferably, the motor is provided as a brushless DC motor.

Another technical solution provided by the present invention is: a hair dryer comprising: a casing, the casing is provided with an air inlet, air enters from the air inlet; a handle is disposed on the casing; Located inside the casing; a fan driven by the motor to rotate and generate an air flow; a blowing pipe connecting the casing and having an air outlet, the airflow is blown out from the air outlet; wherein the handle has an operator An operating grip, the blow tube extending longitudinally along a first axis, the grip extending longitudinally along a second axis, the first axis and the second axis defining a first plane, the center of gravity of the blower A projection on the third plane is within a projection range of the grip on a third plane that is parallel to the first axis and perpendicular to the first plane.

Compared with the prior art, the hair dryer of the present invention has a projection of the center of gravity of the hair dryer on the third plane when the holding portion performs the blowing operation, and is located within the projection range of the grip portion on the third plane. Therefore, the operator does not need to additionally overcome the force of the deflection of the hair dryer, the operation is very comfortable, and the fatigue of long working hours is avoided.

In order to overcome the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a hair dryer having high air blowing efficiency and low power consumption.

In order to solve the above problems, the technical solution of the present invention is:

A hair dryer includes: a casing having an air inlet, the air entering from the air inlet; a motor located inside the casing; and an axial fan driven by the motor to rotate and generate airflow. The axial flow fan includes a hub coupled to the motor and a plurality of blades mounted on the hub; a blowing pipe connecting the casing and having an air outlet, the airflow is blown out from the air outlet; a passage for guiding the airflow to move to the air outlet; the diameter of the axial fan is less than 88 mm, and the speed of the motor is greater than 21,000 rpm.

Preferably, the axial fan is disposed between the motor and the duct.

Preferably, the fan axis of the axial fan coincides with the centerline of the blow pipe.

Preferably, the axial fan has a diameter of not less than 50 mm.

Preferably, the axial fan has a diameter of 82 mm.

Preferably, the motor has a rotational speed value of no more than 50,000 rpm.

Preferably, the ratio of the diameter of the hub to the diameter of the axial fan is in the range of 0.1-0.7.

Preferably, the ratio of the diameter of the hub to the diameter of the axial fan is in the range of 0.3-0.5.

Preferably, the ratio of the diameter of the hub to the diameter of the axial fan is 0.34.

Preferably, the axial fan further comprises a circumferential connecting strip that surrounds all of the blades.

Preferably, the distance between the circumferential connecting strip and the inner wall of the housing is no more than 5 mm.

Preferably, the distance between the circumferential connecting strip and the inner wall of the housing is 1 mm.

Preferably, the blades of the axial fan rotate to form an annular rotating surface, and the ratio of the area of the air outlet to the rotating surface area is in the range of 0.75-1.1.

Preferably, the air volume of the blower is greater than 370 cfm.

Preferably, an angle between an inner wall of the housing that is mated with the blowing tube and a center line of the blowing tube is less than or equal to 5 degrees.

Preferably, an angle between an outer wall of the blowing pipe that is coupled to the housing and a center line of the blowing pipe is less than or equal to 5 degrees.

Compared with the prior art, the axial fan of the hair dryer of the invention has a diameter of less than 88 mm, the rotation speed of the motor output shaft is greater than 21,000 rpm, and the small-diameter fan is driven by the high rotation speed, and the power consumption is smaller and can be obtained higher. The air blowing efficiency makes it easy to blow the heavy leaves of the lawn and the leaves in the cracks.

DRAWINGS

The above described objects, technical solutions and advantageous effects of the present invention can be clearly obtained from the following detailed description of the embodiments of the present invention.

The same numbers and symbols in the drawings and the description are used to represent the same or equivalent elements.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic overall view of a hair dryer according to a first embodiment of the present invention.

Fig. 2 is a schematic view showing the internal structure of the hair dryer of Fig. 1.

Figure 3 is a exploded exploded view of the internal structure of the hair dryer of Figure 1.

Figure 4 is a schematic view of the air outlet of the hair dryer of Figure 1.

Figure 5 is an enlarged schematic view of the area C of the blower of Figure 4;

Figure 6 is a cross-sectional view of the duct of the blower of Figure 2 taken along line AA.

Figure 7 is a schematic cross-sectional view of the hair dryer of Figure 1 in an operational state.

Figure 8 is a plan view of the hair dryer shown in Figure 7.

Figure 9 is a perspective view of the fan of the hair dryer of Figure 3.

Figure 10 is an enlarged schematic view of a B region of the hair dryer of Figure 2;

Figure 11 is a perspective view of the first bracket of the hair dryer of Figure 1.

Figure 12 is a schematic overall view of a hair dryer in accordance with a second embodiment of the present invention.

100, hair dryer 101, longitudinal axis 102, blowing component

103, suction assembly 200, housing 201, upstream area

202, downstream area 203, air inlet 204, surrounding area

205, transition area 206, safety shield 207, labyrinth channel

208, the first channel 209, the second channel 300, the motor

301, motor shaft 302, stator 303, rotor

304, motor housing 305, cooling fan 306, transmission mechanism

400, ducted 401, diversion cone 402, static vane

403, ducted cover 404, protective cover 405, outer casing

406, tapered cavity 407, fixed cover 422, suction pipe

423, outlet pipe 424, spiral passage 425, suction port

500, fan 501, fan axis 502, blade

503, circumferential connecting belt 504, hub 600, blowing pipe

601, air outlet 602, air flow channel 700, handle

701, control switch 703, holding portion 707, first axis

709, second axis 800, support structure 801, first bracket

802, second bracket 803, connector 804, fixed unit

805, inner ring 806, outer ring 807, support

808, first circulation area 809, perforation 810, reinforcing rib

811, the second flow area S1, the area of the rotating surface S2, the area of the air outlet

S4, surrounding area of the wind area S5, transition area of the wind area D1, fan diameter

D2, hub diameter α, inner wall angle β, outer wall angle

G, center of gravity L, longitudinal distance

detailed description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to make the advantages and features of the present invention more readily understood by those skilled in the art. Clearly defined.

1 to 11 show a hair dryer 100 according to a first embodiment of the present invention. The blower 100 includes a housing 200, a motor 300, a duct 400, a fan 500, and a blow tube 600. The motor 300, the duct 400, and the fan 500 are all disposed in the housing 200. The blow pipe 600 is coupled to the housing 200.

As shown in Figures 2 and 3, the blow tube 600 and the housing 200 are coupled to form an air flow passage 602. The air outlet pipe 600 is provided with an air outlet 601. The air moves from the air flow passage 602 to the air outlet 601 and is blown out from the air outlet 601 for blowing away fallen leaves and garbage on the ground. The motor 300 has a motor shaft 301 that is coupled to the fan 500 and that drives the fan 500 to rotate such that the fan 500 is rotatable about its fan axis 501, thereby causing the air to move to form an air flow, as indicated by the arrows in FIG. Of course, the motor shaft 301 can also be connected to the fan 500 through a transmission mechanism. The transmission mechanism can be a common structure such as a planetary gear train. The air flow passage 602 includes an upstream region 201 and a downstream region 202, and a direction from the upstream region 201 to the downstream region 202 is defined as a longitudinal direction. The air moves generally in the longitudinal direction. And the upstream region 201 is located on one side of the longitudinal direction of the fan 500, and the downstream region 202 is located on the other side of the longitudinal direction of the fan 500. The blower 100 defines a longitudinal axis 101 that extends longitudinally.

As shown in FIG. 3, in the present embodiment, the fan 500 is preferably an axial fan. The axial flow fan includes a hub 504 and a vane 502. The direction of movement of the airflow formed by the rotation of the blades 502 of the axial fan is the direction in which the fan axis 501 extends, that is, the fan axis 501 also extends longitudinally and coincides with the longitudinal axis 101. The blades 502 of the axial fan rotate to form a rotating surface that is disposed perpendicular to the longitudinal axis 101. The duct 400 is disposed closer to the fan 500 than the blow tube 600. The housing 200 is further provided with an air inlet 203 through which air enters the interior of the housing 200. In the preferred embodiment, the air inlet 203, the motor 300, the fan 500, and the duct 400 are sequentially arranged in the longitudinal direction. The projection of the air inlet 203 and the air outlet 601 on a plane perpendicular to the longitudinal axis 101 at least partially coincides. The upstream area 201 refers to an area from the air inlet 203 to the plane where the center of the fan 500 is located, and the downstream area 202 refers to an area from the plane where the center of the fan 500 is located to the air outlet 601. When the fan 500 performs the rotating operation, the outside air enters the inside of the casing 200 from the air inlet 203, passes through the fan 500 and the duct 400 in order, and is blown out from the air outlet 601 located in the air blowing pipe 600. Therefore, the motor 300 is disposed outside the duct 400 instead of being disposed inside the duct 400.

As shown in FIGS. 4 and 5, the air inlet 203 is provided with a safety shield 206 detachable from the housing 200. The safety shield 206 is detachably and detachably coupled to the housing 200 by bolts. The role of the safety shield 206 is The user's fingers are prevented from reaching the inside of the casing 200, posing a danger. The safety shield 206 includes a number of mesh structures. Reinforcing ribs are provided between each mesh structure to enhance the firmness of the entire safety shield 206. In addition, the safety shield 206 is not entirely planar, but forms an arcuate air inlet surface. In a preferred embodiment, the mesh structures are labyrinth channels 207, that is to say that the air does not pass straight through the labyrinth channel, but the air creates a bend in the path of travel. The benefit of this design increases the overall travel path of air through the safety shield 206, and the noise propagation path increases as the air passes, reducing noise generation. Tests have shown that the safety shield 206 with this structure allows noise to be reduced by 4 to 6 decibels. The labyrinth channel 207 includes a first channel 208 and a second channel 209 that are disposed at least at an angle. In a preferred embodiment, the angle is an obtuse angle. One end of the first passage 206 communicates with the outside and the other end communicates with the second passage 209. One end of the second passage 209 communicates with the first passage 208, and the other end communicates with the inside of the housing 200. The air first enters the first passage 208 from the outside, then passes through the second passage 209, and finally enters the inside of the casing 200. In a preferred embodiment, the first passage 208 extends generally longitudinally and the second passage 209 is disposed obliquely relative to the longitudinal direction.

There is also a handle 700 on the housing 200 for the operator to hold. Preferably, the handle 700 is further provided with a control switch 701.

As shown in Figures 2, 3 and 6, the duct 400 is located in the downstream region 202. The duct 400 is closer to the fan 500 than the blow tube 600. The function of the duct 400 is to guide the airflow generated by the fan 500 to move toward the air outlet 601 of the blow pipe 600. And the direction of the airflow is unified and unified, and the wind effect is enhanced. The duct 400 includes a flow guiding cone 401, a ducted outer casing 403 for receiving the guiding cone 401, and a stationary vane 402 between the guiding cone 401 and the duct outer casing 403. The flow guiding cone 401 is disposed substantially in the moving direction of the air flow. The flow guiding cone 401 is located at the center of the air flow passage 602, and the flow guiding cone 401 includes a housing 405 and a tapered cavity 406 inside the housing 405. The outer casing 405 of the flow guiding cone 401 and the duct outer casing 403 constitute an air flow space, and the vertical longitudinal axis 101 of the flow space has a substantially annular cross section. The stationary vanes 402 are located within the annular flow space and are generally spaced apart. The space between the two stationary vanes 402 is for airflow. In the present embodiment, the number of the stationary vanes 402 is seven. However, the present invention does not limit the number of stationary vanes 402. In a preferred embodiment, the stationary vanes 402 are disposed obliquely with respect to the direction of airflow movement, and the angle of inclination is preferably 5 to 15 degrees. The stationary vane 402 is fixedly connected to at least one of the flow guiding cone 401 and the duct outer casing 403 in the radial direction. In a preferred embodiment, the volume of the flow guiding cone 401 is less than the volume of the motor 300. That is, the motor 300 cannot be disposed within the flow guiding cone 401. Outside the duct The cover 403 is housed in the housing 200 and is fixedly coupled to the housing 200. In a preferred embodiment, the duct 400 further includes a shield 404 that is disposed perpendicular to the airflow direction, or vertically. The shield 404 functions to prevent foreign matter from entering the duct 400. A fixed cover 407 for fixing the position of the duct 400 to the housing 200 is further disposed between the duct 400 and the casing 200.

In this embodiment, the motor 300 is provided as an alternating current motor. Of course, it can also be set as a DC motor. Accordingly, a battery pack (not shown) is disposed on the casing 200 or the handle 700, and the battery pack is electrically connected to the motor 300. Further, the motor 300 is configured as a DC brushless motor.

As shown in Figures 7 and 8, the handle 700 has a grip 703 for the operator to hold. In addition, the handle 700 is further provided with a control switch 701, and the control switch 701 is electrically connected to the motor 300 to control the opening and closing of the motor 300. Preferably, the control switch 701 can also control the rotational speed of the motor 300.

The blow tube 600 extends longitudinally along the first axis 707, the grip portion 703 extends lengthwise along the second axis 709, the first axis 707 and the second axis 709 define a first plane, and the center of gravity G of the blower 100 is on the second plane The projection is located within the projection range of the grip 703 on the second plane, the second plane being parallel to the second axis 709 and perpendicular to the first plane. As such, when the grip portion 703 is gripped to perform the blowing operation, the second axis 709 of the grip portion 703 is generally substantially parallel to the horizontal plane. At this time, the projection of the center of gravity G of the blower 100 on the second plane is located at the grip portion 703. Within the projection range on the two planes, the operator does not need to additionally overcome the force of the deflection of the blower 100, the operation is very comfortable, and the fatigue of long working hours is avoided.

In this embodiment, the motor 300 is relatively heavy, and is relatively large in the weight of the blower 100. In addition, the blow tube 600 is made of a lighter and thinner material, so that the motor 300 is disposed outside the duct 400. It is located below the grip 703 of the handle 700, thereby ensuring that the projection of the center of gravity G of the blower 100 on the second plane is within the projection range of the grip 703 on the second plane, making the blower 100 comfortable to operate.

In addition, the projection of the center of gravity G of the blower 100 on the third plane is within the projection range of the grip portion 703 on the third plane, the third plane being parallel to the first axis 707 and perpendicular to the first plane. In this way, it is also ensured that when the grip portion 703 is gripped for the air blowing operation, the operator does not need to additionally overcome the force of the deflection of the hair dryer 100, the operation is very comfortable, and the fatigue of long working hours is avoided.

The first axis 707 forms an angle with the second axis 709 of no more than 25 degrees. When the blower 100 is operated to perform the blowing operation, the first axis 707 of the blowing pipe 600 is at an angle of not more than 25 degrees with the horizontal plane, and at this time, the blowing efficiency of the blower 100 is high. Therefore, it is provided that the second axis 709 of the grip portion 703 is substantially parallel to the horizontal plane when the air blowing operation is performed, so that the blower 100 ensures high air blowing efficiency. At the same time, the operation is more comfortable, further avoiding the fatigue of long hours of work.

Preferably, the first axis 707 is at an angle of approximately 10 degrees to the second axis 709. When the blower 100 is operated to perform the blowing operation, the first axis 707 of the blowing tube 600 forms an angle of substantially 10 degrees with the horizontal plane, at which time the blowing efficiency of the hair dryer 100 is the highest. Therefore, it is provided that the second axis 709 of the grip portion 703 is substantially parallel to the horizontal plane when the air blowing operation is performed, so that the blower 100 ensures higher blowing efficiency while being more comfortable to operate.

In the present embodiment, when the first axis 707 is at an angle of not more than 25 degrees with the horizontal plane, the projection of the center of gravity G of the blower 100 on the horizontal plane is located within the projection range of the grip portion 703 on the horizontal plane. With such a setting, it is ensured that the hair dryer 100 ensures high blowing efficiency while the blowing operation is performed, the operation is labor-saving and comfortable, and the fatigue of long-time work is avoided.

Further, when the first axis 707 is at an angle of 10 degrees from the horizontal plane, the projection of the center of gravity G of the blower 100 on the horizontal plane is located within the projection range of the grip portion 703 on the horizontal plane.

Preferably, the center of gravity G of the blower 100 is located between the fan and the motor 300.

Further, the projection of the center of gravity G of the blower 100 on the second plane is located within the projection range of the motor 300 on the second plane.

Additionally, the projection of the motor 300 on the second plane at least partially overlaps the projection of the grip 703 on the second plane. As such, it is further ensured that the projection of the center of gravity G of the blower 100 on the second plane is within the projection range of the grip portion 703 on the second plane. The hair dryer 100 is made compact and comfortable to operate.

As shown in FIGS. 3 and 9, the fan 500 of the hair dryer 100 of the present invention preferably employs an axial flow fan, and the axial flow fan can provide a better blowing effect than the centrifugal fan. The fan 500 is disposed between the motor 300 and the duct 400, in other words, the motor 300 and the duct 400 are located on both sides of the fan 500. The fan axis 501 of the fan 500 coincides with the centerline of the blow tube 600. The housing 200 and the blow tube 600 have an air flow passage 602 therein. The air flow passage 602 includes an upstream region 201 from the air inlet 203 to the fan 500 and a downstream region 202 from the axial fan 500 to the air outlet 601. The motor 300 is disposed in the upstream region 201. The duct 400 is disposed in the downstream area 202.

The motor 300 is disposed in an upstream region 201 within the housing 200. The motor 300 has a motor shaft 301 that is coupled to the fan 500 and that can drive the fan 500 to rotate about its fan axis 501, thereby causing air to move from the upstream region 201 to the downstream region 202. Forming a gas stream. The fan 500 in this embodiment includes a hub 504 that mates with the motor shaft 301 and a plurality of blades 502 that are mounted on the hub 504. The specific number of blades 502 is not critical to the invention. Fan 500 also includes a circumferential attachment strap 503 that surrounds all of the vanes 502. The setting of the circumferential connection belt 503 can be increased on the one hand The rigidity of the fan 500 extends the service life of the fan 500 to prevent the fan 500 from being damaged after being used for a period of time. On the other hand, the stability of the fan 500 after high-speed rotation can be increased, which helps to reduce the noise generated by the fan 500 after high-speed rotation. .

Table 1 lists the data of the noise generated when the fan 500 after the installation of the circumferential connecting belt 503 and the installation of the circumferential connecting belt 503 are experimentally measured by the blower 100. It can be seen from Table 1 that before the installation of the circumferential connecting belt 503, the average value of the four sets of noise data measured in the front is 100 decibels; and the corresponding four sets of noise data measured in the front after the circumferential connecting belt 503 is installed. The average is 96.8 decibels. In addition, it can be seen from Table 1 that before the installation of the circumferential connecting belt 503, the average value of the four sets of noise data measured at the rear is 99.4 decibels; and the corresponding installation of the circumferential connecting belt 503, the four measured at the rear. The average value of the group noise data is 98.2 decibels. It can be seen from the data that the noise measured in different directions when the fan 500 is operated after the circumferential connection belt 503 is installed is reduced.

Table 1

As shown in Fig. 9, in the present invention, the diameter of the fan 500 is less than 88 mm, and the output speed of the motor shaft 301 is greater than 21,000 rpm. Preferably, the fan diameter D1 of the fan 500 is set within a range of 50 mm to 88 mm. In the present embodiment, the fan diameter D1 of the fan 500 is set to 82 mm.

A series of experimental data relating to fan diameter, motor speed, air volume, and wind speed were measured at design time. In the experiment, the motor speed was chosen to be greater than 21,000 rpm, set to 25,000 rpm, and the corresponding air volume and wind speed values were determined when selecting fans 500 of different diameters. The data shows that when the fan diameter is larger than 88 mm, higher air volume and wind speed can be obtained, but at the same time, the power consumption of the blower 100 is higher. The measured data in the experiment is that the power consumption has exceeded 1011W. When the battery pack is used as an energy source, the work time of the blower 100 is severely shortened. Therefore, in order to reduce the power consumption of the blower 100, it is preferable to set the fan diameter of the blower 100 to be less than 88 mm. When the fan diameter is set to a value smaller than 88 mm, the power consumption of the blower 100 is gradually decreased as the value is decreased, but at the same time, the air volume and the wind speed of the blower 100 are also overall. It shows a trend of decreasing. When the fan diameter is set to be less than or equal to 50 mm, the measured air volume value is correspondingly less than or equal to 200 CFM, and the measured wind speed value is correspondingly less than or equal to 70 MPH. At this time, the blower 100 has a poor air blowing effect, and the air blowing efficiency is relatively low. low. Therefore, while considering power consumption, For the blowing effect of the machine 100, the fan diameter is preferably set within a range of 50 mm to 88 mm. The data shows that when the fan diameter is set within the range of 50 mm - 82 mm, the air volume, wind speed and power consumption of the blower 100 increase as the fan diameter increases, and the blower is set when the fan diameter is set to 82 mm. The air volume, wind speed and power consumption of 100 all reach a maximum. When the fan diameter is set within the range of 82 mm - 88 mm, as the fan diameter increases, the air volume, wind speed, and power consumption of the blower 100 also increase, and when the fan diameter is set to 88 mm, the blower 100 The air volume, wind speed and power consumption also reach a maximum. The fan diameter is between 50mm and 82mm. As the diameter of the fan increases, the wind speed, air volume and power consumption increase. While the fan diameter is between 82 mm and 88 mm, the wind speed and air volume are still increasing as the diameter of the fan increases, but the power consumption is greatly increased. In general, the fan diameter is between 50mm and 88mm. As the diameter of the fan increases, the wind speed, air volume and power consumption increase. However, when the diameter exceeds 82 mm, the wind speed and air volume are The increase is not very large, but the power consumption has increased significantly. After the fan diameter exceeds 82 mm, the power consumption is greatly increased only for a small increase in wind speed and air volume. Therefore, the diameter of the fan is set to 82 mm, which allows the blower 100 to be controlled at a lower power consumption. The air volume and wind speed of the blower 100, and ultimately achieve higher blowing efficiency and better blowing effect.

Further, preferably, the output rotational speed of the motor shaft 301 is set within a range of 21,000 rpm to -50,000 rpm. The rotation speed of the motor shaft 301 is increased, and at the same time, the size of the fan 500 is reduced to form a layout for driving the small fan at a high rotation speed. This design reduces power consumption and increases wind speed for a single DC battery pack time, resulting in higher blow efficiency and better blowout.

The ratio of the hub diameter D2 of the hub 504 of the fan 500 to the fan diameter D1 of the fan 500 in this embodiment is in the range of 0.1-0.7. The ratio of the hub diameter D2 of the general fan 500 to the fan diameter D1 is also referred to as the hub ratio, which is hereinafter explained directly in terms of the hub ratio. In the case where the outer diameter of the fan 500 is fixed, the ratio of the hub determines the ratio between the hub 504 and the blade 502, and eventually affects the airflow of the fan 500. According to a set of data obtained from experiments on the relationship between the hub ratio and the air volume, the motor speed is set to be constant at 24,000 rpm, and the minimum cross-sectional area of the upstream region 201 is 7190 MM ² , that is, from the air inlet 203 to the fan 500. The minimum cross-sectional area of the section through which the airflow can be accommodated is 7190 MM ² , and the fan diameter D1 of the fan 500 is set to 82 mm. Under such conditions, the data relationship between the common hub ratio and the air volume is measured. The data shows that as the hub ratio increases, the air volume gradually decreases. In order for the blower 100 to obtain a better air blowing effect, the blower 100 is required to provide a larger air volume, and when the selected hub ratio is 0.1-0.3, the air volume is obtained. A larger value can be obtained, but the consequence is that the hub is too small, and the relative blades are large, resulting in a large noise generated during rotation, and the stability of the fan 500 is poor and is very easy to damage. When the hub ratio is selected to be 0.3-0.5, not only a higher air volume but also the stability of the fan 500 is better and the noise generated during the rotation is smaller. The hub ratio is set to 0.34 in this embodiment. Other values in the range of 0.1-0.7 can be used, especially values in the range of 0.3-0.5.

The fan 500 is disposed within the housing 200. The fan 500 includes a hub 504 that mates with the motor shaft 301 and a plurality of blades 502 mounted on the hub 504. The outer edge of the blade 502 of the fan 500 is also provided with a circumferential connecting strap 503. The shortest distance between the circumferential connecting strip 503 and the inner wall of the housing 200 is from 0 mm to 5 mm (excluding the end points). Preferably, the shortest distance between the circumferential connecting strip 503 and the inner wall of the housing 200 is set to 1 mm, and such a design can provide a better blowing effect while ensuring the assembly condition of the fan 500 and the housing 200.

In the present embodiment, the blower 100 is disposed with the motor 300, the fan 500, the duct 400, the blow pipe 600, and the like from the upstream region 201 to the downstream region 202 in the longitudinal direction. The housing 200 is further provided with an air inlet 203. The air inlet 203 is located in the upstream area 201 and is disposed near the fan 500. The end of the blowing tube 600 is provided with an air outlet 601 for the airflow to be finally blown out. When the fan 500 is rotated by the driving of the motor shaft 301, outside air enters the inside of the casing 200 from the air inlet 203, and then passes through the inside of the duct 400 and the blowing pipe 600, from the air outlet 601 located in the downstream region 202. Blow it out. The blade 502 of the fan 500 is rotated to form an annular rotating surface having a rotating surface area S1, and the area of the fan 500 minus the area of the hub 504 is the rotating surface area S1. The end of the blowing pipe 600 is provided with an air outlet 601. The area ratio of the area S2 of the air outlet 601 to the area S1 of the rotating surface is in the range of 0.75-1.1, so that the flow characteristics of the airflow can be improved to improve the air blowing efficiency, and the blower 100 can be kept. High wind speed and low wind speed loss.

Table 2 lists a set of data relationships between the air outlet area/rotation surface area and wind speed obtained from the experiment. In the experimental measurement, the motor speed was constant at 24,000 rpm, and the area of the air outlet was constant set to 3957 MM ² . A series of data in Table 2 was measured under the conditions that the motor speed and the air outlet area were constantly set. As can be seen from the data in Table 2, when the air outlet area/rotation surface area is set within a value range of 0.75-1.1, the blower 100 can obtain a higher wind speed and the wind speed loss is small.

Table 2

In this embodiment, the air volume of the blower 100 is greater than 370 cfm. Such an air volume design can more easily blow the heavier leaves falling on the lawn and the leaves located in the crevices.

The blower 100 includes a housing 200 and a blow tube 600. The motor 300, the fan 500, and the like are disposed in the housing 200, and the air outlet tube 600 is provided with an air outlet 601. The housing 200 is mated with the blow tube 600 from It forms a complete air duct that allows airflow through. The angle α between the inner wall of the casing 200 mated with the blow pipe 600 and the center line of the blow pipe 600 is 5 degrees or less. The angle β between the outer wall of the blow pipe 600 coupled to the housing 200 and the center line of the blow pipe 600 is 5 degrees or less. Such an angular setting enlarges the cross-sectional area of the outlet of the airflow over the housing 200, and the cross-sectional area of the passageway after the airflow enters the blowpipe 600 is gradually reduced. Such a layout arrangement allows the airflow to increase before entering the blowing tube 600, and the wind speed after entering the blowing tube 600 is enhanced, thereby correspondingly improving the blowing efficiency of the hair dryer 100, and obtaining a better blowing effect.

As shown in FIGS. 2 and 3, the motor 300 is located in the upstream region 201. That is, the motor 300 is located between the air inlet 203 and the fan 500, and the air inlet 203 and the fan 500 are located on both sides of the motor 300. And the motor 300 maintains a certain spatial gap with the housing 200. The air entering from the air inlet 203 first passes through the gap between the motor 300 and the casing 200, and then is rotated by the fan 500, so that airflow can be generated. Since the position where the motor 300 is disposed is located between the air inlet 203 and the fan 500, air always passes around the motor 300, and an additional cooling effect can be generated for the motor 300. Therefore, there is no need to additionally provide a cooling fan, and the heat dissipation requirement of the motor 300 is satisfied, and such a design simplifies the structure of the blower 100. The motor 300 is disposed outside the duct 400, and the size of the duct 400 can be made relatively small, and the size of the duct 400 is not limited by the size of the motor 300. In other words, when designing the size of the duct 400, it is no longer necessary to consider the size limitation of the motor 300, so that the blowing efficiency of the duct 400 can be further improved. The motor 300 includes a stator 302 and a rotor 303 that rotates relative to the stator 302. The rotor 303 is disposed around a motor shaft 301 that extends in the longitudinal direction. The motor shaft 301 is rotated about its axis. The motor shaft 301 is dynamically coupled to the fan 500 to drive the fan 500 to rotate about the fan axis 501. In the present embodiment, the fan 500 is directly mounted on the motor shaft 301, and the axis of the motor shaft 301 coincides with the fan axis 501. The motor 300 of the present embodiment is smaller in volume than a conventional gasoline-fueled engine. Therefore, the vertical longitudinal cross-sectional area of the motor 300 can be smaller than the vertical longitudinal cross-sectional area of the air flow passage 602, so that the motor 300 can be placed in the air flow passage 602. In a preferred embodiment, the ratio of the vertical longitudinal cross-sectional area of the motor 300 to the vertical longitudinal cross-sectional area of the gas flow passage 602 is from 0.6 to 0.7.

Since the motor 300 is located in the upstream region 201, the motor 300 occupies a certain space and volume, and the air moves along the airflow passage 602, which includes a plurality of windward surfaces. The windward surface is a section of the airflow passage 602 that is perpendicular to the direction of movement of the airflow. In order to ensure a sufficient amount of air intake, the area of the smallest wind surface in the upstream region 201 is larger than the area of the rotating surface formed by the rotation of the blades of the fan 500, so that the source can be secured. The continuous air replenishes the blades of the fan 500 to ensure uninterrupted air blowing. Similar to the barrel theory, the amount of air that the upstream region 201 replenishes to the fan 500 depends on the smallest overwind area in the upstream region 201. Therefore, even if the over-wind area of the other portion of the upstream region 201 is large, the minimum amount of the wind-out surface of the fan 500 does not change, and the amount of intake air of the fan 500 does not change. Therefore, raising the minimum over-wind area of the entire upstream region 201 can increase the amount of air entering the fan 500. As shown in FIG. 10, after the air enters the upstream region 201 from the air inlet 203, since the portion of the upstream region 201 close to the air inlet 203 is not blocked, the wind passage area of the portion can be ensured to be larger than the rotating area of the fan. The portion of the upstream region 201 that surrounds the motor 300 is defined as a surrounding region 204, which may be relatively small due to the blocking of the motor 300. However, in order to ensure good blowing efficiency, the minimum area of the longitudinal wind passage area S4 of the surrounding area 204 is designed to be larger than the area of the rotating surface S1 formed by the rotation of the blade 502 of the axial flow fan. Through testing, the relationship between the ratio of the minimum cross-sectional area S4 of the surrounding area 204 to the area of the rotating surface S1 formed by the rotation of the blade 502 of the axial fan and the blowing effect is as follows:

table 3

From this, it can be seen that when the ratio of the ratio of the area of the minimum windward surface S4 of the surrounding area 204 to the area of the rotating surface S1 of the axial flow fan is changed between 1.5 and 2.5, the effect of blowing is significantly improved. When the ratio of the area of the minimum windward surface S4 of the surrounding area 204 to the area of the rotating surface S1 of the axial flow fan is greater than 2, the wind speed and the air volume are slightly increased. However, at this time, the ratio of the area is larger than 2, and the minimum over-wind area of the surrounding area 204 itself is relatively large, and the corresponding volume of the entire blower 1 is relatively large. Therefore, in the present embodiment, the ratio of the minimum area of the windward surface S4 of the surrounding area 204 to the area of the rotating surface S1 of the axial flow fan is 1.8. Under this condition, the air volume blown by the blower 100 can reach 376 CFM, and the wind speed can reach 100 MPH, which satisfies the design requirements of the wind speed and air volume of the blower 100, and the volume of the blower 100 is also within a reasonable range.

The upstream region 201 includes, in addition to the surrounding region 204, a transition region 205 between the surrounding region 204 and the fan 500. The transition region 205 is used to direct air passing around the region 204 to the fan 500. Air enters the transition region 205 from the surrounding area 204 and then passes through the transition region 205. The rear contact fan 500. In the preferred embodiment, the inner wall of the housing 200 in which the transition region 205 is located is a smooth curved surface so that the loss of airflow through the transition region 205 can be effectively reduced. In addition, in order to ensure good blowing efficiency, the ratio of the minimum over-winding area S5 of the transition region 205 to the rotating area S1 ranges between 1.5 and 2.5. Preferably, the ratio is 1.8. That is to say, the minimum over-winding area S5 of the transition region 205 is at least approximately the same as the minimum over-winding area S4 of the surrounding area 204, so that a certain amount of air can be ensured to pass through the transition region 205. In order to ensure a minimum over-winding area of the transition region 205, the motor 300 and the fan 500 are spaced apart by a certain longitudinal distance L, which is 20 mm to 30 mm, preferably a longitudinal distance L between the motor 300 and the fan 500. It is 25 mm.

The blower 100 also includes a support structure 800 for securing the motor 300 to the housing 200. The support structure 800 is also located in the upstream region 201. The support structure 800 includes a first bracket 801, a second bracket 802 that is spaced apart in the longitudinal direction, and a connector 803 that connects the first bracket 801 and the second bracket 802 in the longitudinal direction. In the present embodiment, the connecting member 803 is a bolt. The bolt connects the first bracket 801 and the second bracket 802 in the longitudinal direction.

Please refer to Figure 2, Figure 3 and Figure 11. The first support 801 is fixedly connected to the housing 200 on the one hand and to the motor 300 on the other hand. The first bracket 801 is provided with a fixing unit 804 fixedly engaged with the inner side of the housing 200, and the first bracket 801 supports the motor 300. The first bracket 801 includes an inner ring 805 for fixing the motor 300 and an outer ring 806 for fixing the housing 200. The inner ring 805 and the outer ring 806 are concentrically disposed. Further, the centers of the inner ring 805 and the outer ring 806 are located on the motor axis. The outer surface of the outer ring 806 is provided with a fixing unit 804. The longitudinal width of the outer ring 806 is greater than the longitudinal width of the inner ring 805, and the inner ring 805 is substantially received in the space formed by the outer ring 806. A plurality of support members 807 are disposed between the inner ring 805 and the outer ring 806. The support member 807 extends generally in the radial direction of the motor axis 501. One end of the support member 807 is connected to the outer ring 806, and the other end is connected to the inner ring 805. The plurality of support members 807 are evenly distributed in the circumferential direction, and each of the support members 807 is also provided with a first flow-through region 808 for facilitating gas circulation. In a preferred embodiment, the number of supports 807 is four and the angle between adjacent two supports is 90 degrees. The inner ring 805 is also internally provided with a through hole 809 for accommodating the motor shaft 301. A plurality of reinforcing ribs 810 are disposed between the through holes 809 and the inner ring 805. A second flow area 811 through which gas flows is also disposed around the rib 810.

In another embodiment as shown in Fig. 12, the suction device has a suction function in addition to the blowing function. The blow suction device is thus selectively switchable to the blow mode or the suction mode. Blowing suction device main package The housing 200 is coupled to a blower assembly 102 and a suction assembly 103 that are coupled to the housing 200, respectively. In the blow mode, the blower assembly 102 is coupled to the housing 200. In the suction mode, the suction assembly 103 is coupled to the housing 200. In the present embodiment, the blower assembly 102 includes a blow tube 600 and a duct 400. Fan 500 is preferably also disposed within blower assembly 102 and disposed adjacent to duct 400. The motor 300 is still disposed within the housing 200, and the fan 500 is an axial fan that drives the axial fan to rotate and generate an air flow. The suction assembly 103 includes an air suction duct 422 and an outlet duct 423. In the blow mode, the air blowing assembly 102 and the housing 200 are coupled to form an air flow passage, and the motor 300 cooperates with the fan 500 in the air blowing assembly 102 to generate a blow air flow. The main body 2 is provided with an air inlet, and the air enters the inside of the main body 2 from the air inlet, and forms a gas flow through the fan 500, and the air flow is blown from the air outlet 601 of the air blowing pipe 600. At this point the motor 300 is still in the upstream region 201 and the duct 400 is in the downstream region 202. When the suction device is switched to the suction mode, the air blowing assembly 102 is detached from the housing 200, and the suction assembly 103 is mounted to the housing 200. The suction assembly 103 and the housing 200 form an air flow passage for suction. Garbage such as leaves, dust, and the like are taken in together with air from the suction port 425 of the suction duct 422, and then discharged through the outlet pipe 423 to the collecting device. Air can naturally escape from the collection device, while the garbage is collected in the collection device. A centrifugal fan 1031 is preferably provided in the suction assembly 103. In the present embodiment, the outlet tube 423 also includes a spiral passage 424. The spiral channel 424 has a radial distance to its center gradient. The suction duct 422 is coupled to the center of the spiral passage 424 such that air enters the center of the spiral passage 424 from the suction duct 422 and is also the initial portion of the spiral passage 424. The air then moves along the spiral passage 424 until it exits from the end of the spiral passage 424 and enters the portion of the outlet tube 423 that connects the collection device. A centrifugal fan 1031 may be disposed within the spiral passage 424.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (20)

1. A hair dryer comprising:

   a housing, the housing is provided with an air inlet, and air enters from the air inlet;

   a motor located inside the housing;

   An axial flow fan driven by the motor to rotate along a fan axis and generate an air flow;

   a blowing pipe connecting the casing and having an air outlet, and the airflow is blown out from the air outlet,

   a duct for guiding the airflow to move to the air outlet;

   The utility model is characterized in that: the casing and the blowing pipe have an air flow passage therein, and the air flow passage includes an upstream region from the air inlet to the axial fan and a downstream from the axial fan to the air outlet In the region, the motor is disposed in the upstream region, and the duct is disposed in the downstream region.
2. A hair dryer according to claim 1, wherein said air inlet, said motor, said axial fan and said duct are sequentially arranged in a longitudinal direction.
3. A hair dryer according to claim 1, wherein said air inlet and said air outlet at least partially coincide with a projection on a plane perpendicular to said fan axis.
4. The hair dryer according to claim 1, wherein said air flow passage comprises a plurality of windward surfaces perpendicular to a direction in which the airflow flows, and an area of the minimum windward surface of said upstream region is larger than a blade rotation of said axial flow fan The area of the rotating surface formed.
5. A hair dryer according to claim 4, wherein said upstream region comprises a surrounding area provided around said motor, an area of said smallest wind-over surface of said surrounding area and a rotation of said blade of said axial fan The ratio of the area of the rotating surface ranges between 1.5 and 2.5.
6. A hair dryer according to claim 4, wherein said upstream region includes a transition region between said motor and said axial fan in a longitudinal direction, and an inner wall of said housing in which said transition region is a smooth surface.
7. The hair dryer according to claim 6, wherein a ratio of an area of the minimum windward surface of the transition region to an area of a rotating surface formed by rotation of the blades of the axial fan ranges between 1.5 and 2.5.
8. A hair dryer according to claim 6, wherein a longitudinal distance between said axial fan and said motor is between 20 and 30 mm.
9. A hair dryer according to claim 1, wherein said blower further comprises a support structure for supporting said motor, said support structure comprising an outer ring fixedly coupled to said housing, and an inner ring for fixing said motor And a plurality of supports connecting the inner and outer rings.
10. A hair dryer according to claim 9, wherein said plurality of support members extend radially and adjacent one of said plurality of support members is provided with a flow area through which the airflow passes.
11. A hair dryer according to claim 10, wherein said inner ring has a center hole through which said motor shaft passes and ribs extending radially from said center hole.
12. A hair dryer according to claim 1, wherein a ratio of a cross-sectional area of said motor to a cross-sectional area of said air flow passage is 0.6 to 0.7.
13. A hair dryer according to claim 1, wherein said air inlet is provided with a detachable safety shield.
14. A hair dryer according to claim 13, wherein said safety shield is provided with a labyrinth passage such that air enters the interior of the casing along the curved travel path.
15. A hair dryer according to claim 14, wherein said labyrinth passage includes a longitudinally extending first passage and a second passage disposed at an angle to said first passage.
16. A blow suction device, optionally operating in a blow mode or a suction mode, comprising:

    a housing, the housing is provided with an air inlet, and air enters from the air inlet;

    a motor located inside the housing;

    An axial flow fan driven by the motor to rotate along a fan axis and generate an air flow;

    a blowing assembly and a suction assembly connectable to the housing;

    In the blowing mode, the blowing assembly is coupled to the housing, the axial fan is rotated, and in the suction mode, the suction assembly is coupled to the housing;

    The air blowing component comprises a blowing pipe and a duct, the blowing pipe is connectable to the casing and has an air outlet, the airflow is blown out from the air outlet; the duct is used to guide the airflow Moving toward the air outlet, the housing and the blowing pipe have an air flow passage therein, and the air flow passage includes an upstream region from the air inlet to the axial fan and from the axial fan to the outlet In a downstream region of the tuyere, the motor is disposed in the upstream region, and the duct is disposed in the downstream region.
17. A hair dryer comprising:

    a housing, the housing is provided with an air inlet, and air enters from the air inlet;

    a motor located inside the housing;

    An axial flow fan driven by the motor to rotate along a fan axis and generate an air flow;

    a blowing pipe connecting the casing and having an air outlet, and the airflow is blown out from the air outlet,

    a duct for guiding the airflow to move to the air outlet;

    The utility model is characterized in that the motor is arranged outside the duct.
18. A hair dryer comprising:

    a housing, the housing is provided with an air inlet, and air enters from the air inlet;

    a motor located inside the housing;

    An axial flow fan driven by the motor to rotate along a fan axis and generate an air flow;

    a blowing pipe connecting the casing and having an air outlet, and the airflow is blown out from the air outlet,

    a duct for guiding the airflow to move to the air outlet;

    The motor and the duct are respectively disposed on two sides of the axial fan.
19. A hair dryer comprising:

    a housing, the housing is provided with an air inlet, and air enters from the air inlet;

    a handle disposed on the housing;

    a motor located inside the housing;

    a fan driven by the motor to rotate and generate an air flow;

    a blowing pipe connecting the casing and having an air outlet, the airflow is blown out from the air outlet;

    Characterized in that the handle has a grip for operation by an operator, the blow tube extends longitudinally along a first axis, the grip extends longitudinally along a second axis, the first axis and the second axis Defining a first plane, a projection of a center of gravity of the blower on a second plane being within a projection range of the grip on a second plane, the second plane being parallel to the second axis and perpendicular to The first plane.
20. A hair dryer comprising:

    a housing, the housing is provided with an air inlet, and air enters from the air inlet;

    a motor located inside the housing;

    An axial fan driven by the motor to rotate and generate airflow,

    The axial flow fan includes a hub mated with the motor and a plurality of blades mounted on the hub;

    a blowing pipe connecting the casing and having an air outlet, the airflow is blown out from the air outlet;

    a duct for guiding the airflow to move to the air outlet;

    It is characterized in that the diameter of the axial flow fan is less than 88 mm, and the rotational speed of the motor is greater than 21,000 rpm.

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