CN114059482A

CN114059482A - Hair drier

Info

Publication number: CN114059482A
Application number: CN202110836473.5A
Authority: CN
Inventors: 郭建朋; 李经纬
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2020-08-03
Filing date: 2021-07-23
Publication date: 2022-02-18
Also published as: CN216074924U; CN216474744U; CN114059483B; CN216474745U; CN114059483A

Abstract

The invention discloses a hair drier, comprising: the motor and the fan are driven to rotate by the motor; a power supply device for supplying power to the motor; a housing assembly, the housing assembly comprising: an outer air duct forming an outer air inlet portion and an outer air outlet portion; the inner air pipe is used for supporting the motor and forms an inner air inlet part; optionally, the outer air duct further includes a fan housing, the fan housing is disposed at the outer air inlet portion, and the fan housing is disposed to surround one end of the inner air duct, so that a part of air flow entering from the fan housing can flow to the inner air inlet portion from the front end and the rear end of the inner air duct. The hair drier provided by the invention can improve the blowing efficiency and reduce the static electricity generated by the fan.

Description

Hair drier

Technical Field

The invention relates to a garden tool, in particular to a blower.

Background

The blower, as a garden-like tool, can be used to clean the floor. The air inlet performance of the air inlet portion limits the blowing efficiency of the blower, if the air inlet performance is to be improved, the problems of use safety of the air outlet machine, strength of the whole blower and the like need to be considered, and the weight of the whole blower is not increased, so that the problem that how to improve the air inlet performance of the blower is difficult to solve is solved. Meanwhile, the hair drier is easy to generate static electricity when in use, and the comfort of users is reduced.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a hair drier which can improve the blowing efficiency and reduce the static electricity generated by a fan.

In order to achieve the above main object of the present invention, there is provided a hair dryer comprising: the motor and the fan are driven to rotate by the motor; a power supply device for supplying power to the motor; a housing assembly supporting the motor and the fan; the fan comprises fan blades, the number of the fan blades is more than or equal to 8 and less than or equal to 12, the outer diameter of each fan blade is more than 78mm and less than 130mm, and the torsion angle of each fan blade is more than or equal to 45 degrees and less than or equal to 54 degrees.

Optionally, the distance between the fan blades is set to be greater than or equal to 8mm and less than or equal to 12 mm.

Optionally, the outer diameter of the fan blade is set to be greater than 78mm and less than 98 mm.

Optionally, the inlet angle of the fan blade is set to be greater than or equal to 5 ° and less than or equal to 20 °.

Optionally, the length of the edge of the fan blade is set to be greater than or equal to 8.5mm and less than or equal to 14.5 mm.

Optionally, the hub diameter ratio of the fan is set to be greater than or equal to 0.41 and less than or equal to 0.5.

Optionally, a guide cone for fixing the motor is formed inside the shell assembly, the motor is arranged inside the guide cone, and the difference between the diameter of the hub of the fan and the diameter of the end face of the guide cone is less than or equal to 10% of the diameter of the hub of the fan.

Optionally, an included angle formed by a connection line between the adjacent end points of the two adjacent fan blades and the axis of the fan is set to be greater than or equal to 10 degrees and less than or equal to 20 degrees.

Optionally, the housing assembly comprises: the outer air pipe forms an outer air inlet; the inner air pipe is positioned in the outer air pipe, the inner air pipe generates an inner air inlet, the outer air inlet is provided with a front end and a rear end in the axial direction along the first axis, and the projection of the inner air inlet in the radial direction of the first axis is positioned between the projection of the front end and the projection of the rear end of the outer air inlet in the direction.

Optionally, the distance between the front end of the outer air inlet and the inner air inlet in the axial direction of the first axis is greater than or equal to 3 mm.

Drawings

Fig. 1 is a perspective view of a first embodiment of the present invention.

Figure 2 is a plan view of the blower of figure 1.

Figure 3 is a cross-sectional view of the blower of figure 1.

Figure 4 is a block diagram of a batteryless pack for the blower of figure 1.

Figure 5 is a schematic size view of the blower of figure 1.

Figure 6 is a schematic view of the internal structure of the hair dryer of figure 1.

Figure 7 is an enlarged view of a portion of the operational components of the blower of figure 6.

Figure 8 is a perspective view of the fan of the blower of figure 1.

Figure 9 is a dimensional schematic of the fan of the blower of figure 8.

Figure 10 is a dimensional schematic of the fan of the blower of figure 8.

Figure 11 is a cross-sectional view of the blower of figure 1.

Figure 12 is a control logic diagram for the operating components of the blower of figure 1.

Figure 13 is a control logic diagram of the operating components of a blower in one embodiment.

Figure 14 is a dimensional schematic of a blower fan.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

In one embodiment of the present invention, referring to fig. 1 to 3, a blower 100 includes a motor 110, a fan 120, a power supply device 121, and a housing assembly 130. The housing assembly includes an outer air duct 140 and an inner air duct 150. The fan 120 is driven to rotate by the motor 110, and the power supply device 121 is used for supplying power to the motor 110. The case assembly 130 includes an outer air inlet portion 131 and an outer air outlet portion 132. An outer air duct 140 connects the outer air inlet portion 131 and the outer air outlet portion 132, an inner air duct 150 supports the motor 110, and the inner air duct 150 forms an inner air inlet portion 151. The housing assembly 130 includes a hood 133, the hood 133 is disposed on the outer air inlet 131, and the hood 133 is disposed to surround one end of the inner air duct 150, so that a part of the air flow entering from the hood 133 can flow to the inner air inlet 151 from the front end and the rear end of the inner air duct 150.

Optionally, the housing assembly 130 includes an outer air duct 140 forming an outer air inlet portion 131 and the outer air inlet portion 132, the outer air inlet portion 131 includes an outer air inlet 1311 for supplying air, and the inner air inlet portion forms an inner air inlet. The inner duct 150 forms an inner air inlet 151. The hood 133 is disposed at the outer air inlet portion 131, and the hood 133 is disposed to surround one end of the inner air duct 150, so that a part of the air flow entering from the hood 133 can flow to the inner air inlet portion 151 from the front end and the rear end of the inner air duct 150.

Alternatively, the motor 110 is set to rotate around the first axis 101, the outer intake vent has a front end and a rear end in an axial direction along the first axis 101, and a projection of the inner intake vent in a radial direction of the first axis 101 is located between projections of the front end and the rear end of the outer intake vent in the direction.

The direction on the blower 100 is set, with the outer wind-out portion at the front end of the blower 100. Outer air inlet portion 131 is set up rear portion, week side, upper portion and the lower part that covers interior tuber pipe 150 to outer air intake is set up the rear portion, week side, upper portion and the lower part that distributes at interior tuber pipe 150, thereby promotes the air inlet area of outer air intake, and realizes the ascending air inlet of a plurality of directions of hair-dryer 100, promotes air inlet efficiency, and reduces the windage. The fan housing 133 includes ribs 1331 distributed in a ring shape, and the outer air inlet is formed between a plurality of the ribs 1331. Adjacent the interval of rib 1331 is set up more than or equal to 8mm and less than or equal to 10mm to promote effective air inlet area, promote air inlet efficiency. In this embodiment, the total area of the outer air inlet is greater than 20000 square millimeters.

Referring to fig. 1 to 4, the housing assembly 130 includes a handle portion 134, the handle portion 134 and an outer air duct 140 are connected to the front end of the outer air inlet portion, and the handle portion 134 can contact the upper end of the outer air inlet portion and can be spaced apart from the outer air inlet portion, thereby increasing the air inlet area. The housing assembly 130 also includes electrical connections 135 for removably connecting a power supply device, which may be a battery pack. The housing assembly 130 further includes a bracket 136 provided at a lower end of the outer air inlet portion, the bracket 136 forming a supporting plane, and a downward projection of the center of gravity of the whole blower 100 is located in the first supporting plane when the battery pack is not mounted to the electrical connection portion 135, so that the blower can be smoothly placed on the plane through the bracket 136. The downward projection of the center of gravity of the blower 100 is overlapped with the projection of the outer air inlet part in the direction.

Referring to fig. 5, the ratio of the effective air intake area a1 of the outer air intake to the cross-sectional area a2 of the inner air intake perpendicular to the first axis 101 is greater than or equal to 1.8. The ratio of the effective air inlet area a1 of the outer air inlet to the area of the cross section a3 passing through the fan 120 and perpendicular to the first axis 101 in the inner air duct is greater than or equal to 2 and less than or equal to 5, so that the air inlet amount and the air inlet efficiency of the blower 100 are improved. Through above structure, can realize the effective air inlet area a1 of outer air intake with pass through in the outer tuber pipe 140 fan 120 and perpendicular to the area ratio more than or equal to 3 less than or equal to 4.5 of the cross section a3 of first axis 101 to the interval of outer air intake and interior air intake is increased relatively, thereby reduces the wind speed of outer air intake department, reduces the windage, with promotion air inlet efficiency.

The distance L1 between the front end of the outer air inlet and the inner air inlet in the axial direction of the first axis 101 is larger than or equal to 3mm, so that the noise generated in the operation process of the air blower 100 is reduced. Optionally, in order to improve the air intake efficiency, a distance between the front end of the outer air inlet and the inner air inlet in the axial direction of the first axis is greater than or equal to 40mm and less than or equal to 100 mm.

The housing assembly further includes an extension portion connecting the handle portion and the outer air inlet duct. Optionally, the fan housing and the shell assembly are integrally formed, so that the whole machine is lighter and more compact.

Referring to fig. 6 and 7, the electrical connection part 135 includes a slider 1351, a resilient member 1352, and a positioning groove 1353. The slider 1351 has a first positioning member 1354 and a second positioning member 1355; the elastic element 1352 abuts against the slider 1351. The sliding block 1351 is disposed in the positioning groove 1353, and the first positioning element 1354 and the second positioning element 1355 are disposed in abutment with the positioning groove 1353, so that the sliding block 1351 can slide in the positioning groove 1353. The electrical connection portion 135 includes a connection end and a pole piece provided at the connection end, and when the battery pack is connected to the electrical connection portion 135, the battery pack abuts against the connection end and is in contact with the pole piece. The slider 1351 partially exposes the connection end, and when the battery pack is not mounted, the slider 1351 surrounds the pole piece, so that a user cannot directly contact the pole piece, and the user is prevented from contacting the pole piece to cause electric shock. The elastic part is connected and abutted with the sliding block 1351, when a user inserts the battery pack, the sliding block 1351 slides from the outer side of the connecting end to the inner part of the positioning groove 1353, the sliding block 1351 slides in the inner part of the positioning groove 1353 and is supported by the first positioning part 1354 and the second positioning part 1355, the sliding block 1351 is displaced to expose the pole pieces, and therefore the battery pack is connected with the pole pieces to realize electrical connection.

The first and

second locators

1354 and 1355 are spaced apart in height so that the locators 1353 can have a certain height to prevent dust from blocking the locators 1353, thereby reducing the risk of dust causing the slider 1351 to jam. The arrangement of the first and

second positioning members

1354 and 1355 can also reduce the wobbling of the slider 1351 in the positioning groove 1353.

The electrical connection 135 further includes a locking member 1356 and a release button 1357, and when the battery pack is connected to the electrical connection 135, the locking member 1356 abuts against the front end of the slider 1351 to restrict the elastic member from moving the slider 1351 forward, i.e., to prevent the slider 1351 from moving outward of the positioning groove 1353. The locking member 1356 is connected to a second elastic member 1358, when the user pushes the release button 1357 to compress the second elastic member 1358, the locking member 1356 is driven to displace, which no longer restricts the movement of the slider 1351, and the elastic member pushes the slider 1351 to drive the battery pack to be pulled out from the electrical connection portion 135.

During operation of the hair dryer 100, the fan 120 is rotated at high speed, and static electricity is easily generated. Static electricity is not only prone to breakdown the electronic components of the hair dryer 100, causing damage to the hair dryer 100, but also to produce sparks that strike the user. In order to reduce the static electricity generated by the fan 120, the number of blades needs to be reduced, but if the number of blades is directly reduced, the air volume generated by the fan 120 is insufficient, so that the performance of the hair dryer 100 is reduced. Optionally, referring to fig. 8, 9 and 10, the fan 120 includes fan blades 122, an outer diameter L2 of each fan blade 122 is set to be greater than 78mm and less than 130mm, and a minimum distance between two fan blades 122 is set to be greater than or equal to 8mm and less than or equal to 12mm, where if the distance between the fan blades 122 is too low, static electricity generated when the fan rotates may be increased due to friction of airflow to the fan blades, and if the distance between the fan blades 122 is too high, air volume generated by the fan may be reduced. The inlet angle alpha 1 of the fan blade is set to be more than or equal to 5 degrees and less than or equal to 20 degrees, and the inlet angle of the fan blade refers to the included angle between the tangent of the root front section of the wind impeller hub and the axis of the fan (the root front section of the wind impeller hub refers to the part of the root of the wind impeller hub which cuts air firstly).

The number of the fan blades is more than or equal to 8 and less than or equal to 12. The torsion angle alpha 2 of the fan blade is set to be more than or equal to 45 degrees and less than or equal to 54 degrees, and we find that if the torsion angle of the fan blade is too high, the wind power generated in the axial direction is small, and if the torsion angle of the fan blade is too low, the airflow is dispersed from the radial direction of the fan blade, so that the proper torsion angle of the fan blade needs to be set to improve the air output of the fan. The hub diameter L3 of the fan 120 is set to 35mm or more and 45mm or less, and the length of the impeller hub root L4 is set to 18mm or more and 29mm or less. The edge length L5 of the fan blade is set to be more than or equal to 8.5mm and less than or equal to 14.5 mm. Compared with the conventional fan 120, the fan 120 of the present embodiment can reduce the frequency of cutting air at the same rotation speed, and reduce the noise generated by the rotation of the fan 120, by setting the relative lifting hub diameter ratio (the ratio of the outer diameter of the fan blade 122 to the hub diameter) to be greater than or equal to 0.41 and less than or equal to 0.5, reducing the inlet angle of the fan blade, and increasing the chord length of the root of the fan blade, the kinetic energy efficiency of the fan 120 can be effectively improved, and the air volume generated by the fan 120 can be increased under the same power. Optionally, the outer diameter L2 of the fan blade 122 is set to be larger than 78mm and smaller than 98mm, so that the kinetic energy efficiency can be improved well.

Optionally, the fan 120 includes fan blades 122, an outer diameter of each fan blade 122 is greater than 82mm and less than 94mm, and on an axial projection of the axis of the fan 120, an included angle formed by a connection line between adjacent end points of two adjacent fan blades 122 and the axis is set to be greater than or equal to 10 degrees and less than or equal to 20 degrees. Optionally, an included angle formed by a connection line between the adjacent end points of the two adjacent fan blades 122 and the axis is set to be greater than or equal to 12 degrees and less than or equal to 18 degrees. The inlet angle alpha 1 of the fan blade is set to be more than or equal to 5 degrees and less than or equal to 15 degrees. The number of the fan blades is more than or equal to 8 and less than or equal to 9. The hub diameter of the fan 120 is set to 38mm or more and 42mm or less, and the length of the impeller hub root portion L4 is set to 20mm or more and 26mm or less. The edge length L5 of the fan blade is set to be more than or equal to 10mm and less than or equal to 13 mm. Compared with the conventional fan 120, the fan 120 of the present embodiment can reduce the frequency of cutting air at the same rotation speed, and reduce the noise generated by the rotation of the fan 120, and optionally set the relative lift hub diameter ratio (the ratio of the outer diameter of the fan blade 122 to the hub diameter) to be greater than or equal to 0.43 and less than or equal to 0.49, and reduce the inlet angle of the fan blade, and increase the chord length of the root of the fan blade, so as to effectively improve the kinetic energy efficiency of the fan 120, and increase the air volume generated by the fan 120 under the same power.

Referring to fig. 11, a guide cone 152 fixing the motor 110 is formed inside the inner duct 150, the motor 110 is disposed inside the guide cone 152, and a diameter of a hub of the fan 120 and a diameter of an end surface of the guide cone 152 coincide or differ by no more than 10% of the diameter of the hub of the fan 120 in the axial direction of the first axis 101, so that a projection of the hub of the fan 120 and a projection of the guide cone 152 substantially overlap in the axial direction of the first axis 101, so that the hub of the fan 120 and the guide cone 152 have no gap in the radial direction of the first axis 101.

When the motor 110 operates, the fan 120 rotates to generate high-speed airflow, the air pressure near the fan 120 is low, the heat dissipation airflow flows from the front end of the guide cone 152 to the rear end of the guide cone 152, that is, near the fan 120, and the hub of the fan 120 and the guide cone 152 are arranged in a manner of being close in size to reduce the gap therebetween, so that the airflow generated by the rotation of the fan 120 flowing to the inside of the guide cone 152 is reduced, the airflow inside the guide cone 152 is prevented from being disturbed, and the heat dissipation efficiency of the motor 110 can be effectively improved.

Referring to fig. 6 and 12, the blower 100 further includes a control unit 150 and an operating assembly 160. The fan 120 is driven to rotate by the motor 110, the power supply device 121 is used for supplying power to the motor 110, the control unit 150 controls the operation of the motor 110, and the operating assembly 160 is connected with the control unit 150 in a communication mode. The operating assembly 160 comprises a trigger 161, the trigger 161 is used for controlling the starting and the rotating speed of the motor 110 by a user, the operating assembly 160 further comprises a speed regulating knob 162, the speed regulating knob 162 is arranged to be operated for a first action and a second action, when the speed regulating knob 162 is operated to execute the first action, the speed regulating knob 162 sends an electric signal to the operating assembly 160 to regulate and lock the rotating speed of the motor 110; when the speed knob 162 is actuated in a second motion, the speed knob 162 sends an electrical signal to the operating assembly 160 to lock the fan 120 in maximum gear rotation. The blower 100 further comprises a control circuit by which the power supply unit 121, the control unit 150 and the operating assembly 160 are electrically connected.

The first action is to rotate the speed knob 162 in a first direction or a second direction, and the second action is to press the speed knob 162. The inner air duct 150 is used to support the motor 110. The trigger 161 and the speed control knob 162 are disposed opposite to the handle 134, so that when a user holds the handle 134, the user can touch and control the trigger 161 and the speed control knob 162 by the held hand, and can press the trigger 161 and perform the first action and the second action on the speed control knob 162, that is, when the user holds the handle 134, the user can press the trigger 161 and press the speed control knob 162, or press the trigger 161 and rotate the speed control knob 162, or press the trigger 161 and press and rotate the speed control knob 162.

Optionally, the speed knob 162 sends a phase signal to the control unit 150 to adjust and lock the rotational speed of the motor 110 when the first action is performed.

The control unit 150 is configured as an integrated PCB, and when the trigger 161 is pressed by a user to change the displacement, a first type signal is sent to the control unit 150, and the control unit 150 controls the rotation speed of the motor 110 according to the information of the first type signal. Optionally, the resistance value of the control circuit is changed by the displaced trigger 161, so as to send a corresponding voltage signal to the control unit 150, and further adjust the duty ratio, so as to control the rotation speed of the motor 110, where the first type of signal is a voltage signal. The motor 110 is controlled to be turned on when the control unit 150 is set to receive only the first type signal. Optionally, when the voltage signal reaches a preset value, the control unit 150 controls the motor 110 to turn on. When the trigger 161 is no longer being pressed, the control unit 150 controls the motor 110 to stop rotating according to the change of the first type signal.

When the speed knob 162 is operated to perform the first action, i.e., the speed knob 162 is rotated, the second type of signal is sent to the control unit 150, and the control unit 150 locks the minimum rotation speed of the motor 110 according to the second type of signal. Optionally, the second type of signal is a phase signal, when the speed adjustment knob 162 is rotated, a changing phase signal is output, and the control unit 150 adjusts the duty ratio of the control circuit according to the change of the phase signal, so that the speed adjustment process is smoother and more reliable.

After the user locks the minimum rotation speed of the fan 120 by the speed adjustment knob 162, when the user presses the trigger 161, the control unit 150 will correspondingly increase the rotation speed of the fan 120 when receiving the first type of signal, and after the user releases the trigger 161, the rotation speed of the fan 120 can be decreased to the minimum rotation speed locked by the speed adjustment knob 162 by the limitation of the rotation speed signal output by the speed adjustment knob 162. When the speed knob 162 is rotated to a certain position, the rotation speed of the fan 120 is not lower than the rotation speed corresponding to the certain position.

Optionally, when the speed knob 162 is set to rotate in the first direction, the control unit 150 increases the minimum locking rotation speed of the motor 110, that is, when the speed knob 162 is rotated 30 degrees relatively to the first direction, the control unit 150 controls the minimum locking rotation speed of the motor 110 to be the first rotation speed, when the speed knob 162 is rotated 60 degrees relatively, the control unit 150 controls the minimum locking rotation speed of the motor 110 to be the second rotation speed, and the second rotation speed is greater than the first rotation speed, when the minimum locking rotation speed of the motor 110 is the first rotation speed, the control unit 150 may control the motor 110 to rotate at a rotation speed greater than the first rotation speed according to the first type signal output by the trigger 161, and when the speed corresponding to the position of the trigger 161 is less than the first rotation speed, the control unit 150 controls the motor 110 to operate at the first rotation speed.

The speed knob 162 has a rotational position corresponding to a maximum locking speed, i.e. when the motor is rotated in the first direction up to or beyond a certain angle, the control unit 150 receives the second type of signal to control the lowest locking rotational speed of the motor 110 to be at the highest value. At this point, as the speed knob 162 continues to rotate in the first direction in the locked position, the control unit 150 no longer increases the minimum locked speed to the motor 110. When the speed knob 162 is rotated to a certain angle in the first direction, and when the speed knob 162 is operated to rotate in a second direction opposite to the first direction, a second type of signal is sent to the control unit 150, the control unit 150 controls to reduce the lowest locking rotation speed of the motor 110 according to the second type of signal, and when the speed knob 162 is continuously rotated in the second direction, the lowest locking rotation speed of the motor 110 can be reduced to zero.

The speed knob 162 can emit a second type of signal including a first pulse signal and a second pulse signal, and the control unit 150 determines the rotation direction of the speed knob 162 by recognizing the relative positions of the first pulse signal and the second pulse signal, thereby recognizing the speed-up or speed-down command of the user. The control unit 150 recognizes the rotation angle of the speed knob 162 by recognizing the phase difference of the first pulse signal and the second pulse signal, thereby correspondingly adjusting the lowest locking rotation speed of the motor 110.

A sensing element is arranged below the speed control knob 162, when the speed control knob 162 is operated for the second action, that is, when the speed control knob 162 is pressed, the sensing element senses the action of the speed control knob 162 and sends a third type of signal to the control unit 150, the control unit 150 controls the motor 110 to operate at the set maximum rotation speed when receiving the third type of signal, when the motor 110 operates at the maximum rotation speed, the fan 120 is driven to rotate at the maximum rotation speed, and the control unit 150 locks the fan 120 to rotate at the maximum gear position. Alternatively, the maximum value of the lowest locking rotation speed of the motor 110 is set to be less than the maximum rotation speed of the motor 110, that is, the motor 110 can be driven to operate at the maximum rotation speed, which cannot be achieved by rotating the speed knob 162, only by operating the speed knob 162 to perform the second action by the user. When the speed knob 162 is operated for the second action, the control unit 150 receives a third type of signal to lock the motor 110 to the maximum rotational speed, and the release of the trigger 161 does not stop the motor 110.

In one embodiment of the present invention, referring to fig. 13, the operating assembly 160 includes a trigger 161 and a speed adjusting knob 162, the control unit 150 controls the motor 110 to be started when the trigger 161 is set to be pressed, the amount of displacement of the pressed trigger 161 is proportional to the rotation speed, and the control unit 150 controls the motor 110 to be stopped when the speed adjusting knob 162 is not operated and the trigger 161 is released. The specific control principle is similar to the above-described embodiment and will not be described in detail here.

The speed knob 162 is set to a speed that can be adjusted by the operation of the lock-out current trigger 161. When the user presses the trigger 161 to cause the motor 110 to output at the first rotational speed, the speed knob 162 is operated to rotate in the first direction by an angle, which may be one unit of rotation or two units of rotation of the speed knob 162, such as 15 degrees of rotation of the speed knob 162 for one unit of rotation of the speed knob 162, to activate the locking of the rotational speed of the motor 110. When the user presses the trigger 161 to control the motor 110 to output at the first rotation speed, the speed-adjusting knob 162 is rotated to a predetermined angle in the first direction, and at this time, the speed-adjusting knob 162 generates the second type of signal to the control unit 150, and the control unit 150 controls the rotation speed of the motor 110 to maintain at the first rotation speed according to the second type of signal. After the rotational speed of the motor 110 is locked by rotating the speed knob 162, the trigger 161 is released and the control unit 150 controls the motor 110 to rotate at the first rotational speed. After the rotation speed of the motor 110 is locked by rotating the speed adjusting knob 162, the speed adjusting knob 162 is rotated along the first direction, the speed adjusting button sends the second type of signal to the control unit 150, and the control unit 150 adjusts the rotation speed of the motor 110 by providing the over-adjustment duty ratio, so that the motor 110 can be adjusted to the maximum value of the preset locking rotation speed. The control unit 150 is provided with an algorithm such that when the rotation speed of the motor 110 reaches the preset maximum value, the rotation of the speed knob 162 in the first direction is continued without increasing the rotation speed of the motor 110 any more. At this time, the speed adjustment knob 162 is rotated along the second direction to generate a second type of signal, which is sent to the control unit 150, and the control unit 150 controls the motor 110 to correspondingly decrease the speed according to the rotation angle of the speed adjustment knob 162 in the second direction according to the information of the second type of signal until the speed adjustment knob 162 is continuously rotated towards the second direction, so that the speed of the motor 110 is decreased to zero.

When the speed knob 162 is pressed, a third type signal is sent to the control unit 150, and the control unit 150 adjusts the rotational speed of the motor 110 so as to make the fan at a set maximum rotational speed, which is greater than the maximum value at which the rotational speed can be locked by rotating the speed knob 162. At this time, the speed knob 162 is rotated in the first direction by at least one rotation unit, and the speed knob 162 sends a second type signal to the control unit 150, so that the control unit 150 locks the motor 110 at the maximum rotation speed. The control unit 150 is configured to control the motor 110 to be out of the locked state and to terminate the maximum rotation speed state of the motor 110 only when receiving a second type of signal generated by rotating the speed control knob 162 in the second direction.

The control unit 150 is provided in the handle portion 134. The blower 100 further includes a heat sink disposed between the control unit 150 and the outer air inlet portion 131, with the heat sink being in at least partial contact with the control unit 150, and the heat sink being proximate to the outer air inlet portion 131 and at least partially exposed to the outer air inlet portion 131. The heat dissipation member is used for guiding heat generated by the control unit 150, and the air flow generated by the air inlet portion takes away the heat absorbed by the heat dissipation member, so that the heat dissipation effect on the control unit 150 is improved.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. A hair dryer, comprising:

a motor for driving the motor to rotate in a forward direction,

a fan driven to rotate by the motor;

a power supply device for supplying power to the motor;

a housing assembly supporting the motor and the fan;

the fan is characterized by comprising fan blades, wherein the number of the fan blades is more than or equal to 8 and less than or equal to 12, the outer diameter of each fan blade is more than 78mm and less than 130mm, and the torsion angle of each fan blade is more than or equal to 45 degrees and less than or equal to 54 degrees.

2. The hair dryer of claim 1, wherein: the distance between the fan blades is set to be more than or equal to 8mm and less than or equal to 12 mm.

3. The hair dryer of claim 2, wherein: the outer diameter of the fan blade is set to be larger than 78mm and smaller than 98 mm.

4. The hair dryer of claim 2, wherein: the inlet angle of the fan blade is set to be greater than or equal to 5 degrees and less than or equal to 20 degrees.

5. The hair dryer of claim 4, wherein: the edge length of the fan blade is set to be more than or equal to 8.5mm and less than or equal to 14.5 mm.

6. The hair dryer of claim 5, wherein: the hub diameter ratio of the fan is set to be greater than or equal to 0.41 and less than or equal to 0.5.

7. The hair dryer of claim 5, wherein: the shell assembly is internally provided with a guide cone for fixing the motor, the motor is arranged in the guide cone, and the difference between the diameter of the hub of the fan and the diameter of the end face of the guide cone is less than or equal to 10% of the diameter of the hub of the fan.

8. The hair dryer of claim 5, wherein: an included angle formed by connecting the adjacent end points of the two adjacent fan blades and the axis of the fan is set to be more than or equal to 10 degrees and less than or equal to 20 degrees.

9. The hair dryer of claim 1, wherein: the housing assembly includes: the outer air pipe forms an outer air inlet; the inner air pipe is positioned in the outer air pipe, the inner air pipe generates an inner air inlet, the outer air inlet is provided with a front end and a rear end in the axial direction along the first axis, and the projection of the inner air inlet in the radial direction of the first axis is positioned between the projection of the front end and the projection of the rear end of the outer air inlet in the direction.

10. The hair dryer of claim 9, wherein: the distance between the front end of the outer air inlet and the inner air inlet in the axial direction of the first axis is more than or equal to 3 mm.