CN203279986U - Handheld type blower - Google Patents

Abstract

A hand-held hair dryer, including a housing, a handle, a battery and a blowing pipe, the housing is provided with an air inlet and a duct assembly, the duct assembly includes a duct connected to the housing and installed in the duct The motor and the fan, the casing is connected to the blowing pipe through a channel assembly, the battery is installed on the casing, and when the hand-held hair dryer operates at the maximum air volume, the ratio of the air volume to the input power is greater than or equal to 0.7cfm/w. Therefore, the blowing efficiency of the hair dryer is higher, and the needs of users are met to a greater extent.

Description

Handheld Hair Dryer

technical field

The invention relates to a garden electric tool, in particular to a hand-held hair dryer. the

Background technique

The hand-held DC blower is mainly used to blow the fallen leaves and small garbage near the ground, stadium and stands. In order to blow up a large number of fallen leaves on the ground and some heavy garbage in the cracks, a large air volume of the hand-held hair dryer is usually required. However, due to the limitation of the air duct design, the hand-held DC hair dryer with the battery pack installed on the market currently The air outlet efficiency of the hair dryer is low, and the air volume of the hair dryer is small, which cannot meet the requirements of users. the

Contents of the invention

The object of the present invention is to provide a high-efficiency hand-held hair dryer. the

In order to achieve the above purpose, the present invention provides a hand-held hair dryer, which includes a housing, a handle, a battery and a blower, the housing is provided with an air inlet and a duct assembly, and the duct assembly includes a The duct and the motor and fan installed in the duct, the casing is connected to the blowing pipe through the duct assembly, the battery is installed on the casing, and when the hand-held hair dryer operates at the maximum air volume, the air volume The ratio to the input power is greater than or equal to 0.7cfm/w. the

Further, a central axis is defined on the blowing pipe, and along the direction of the axis, the flow cross-section of the air channel near the air inlet at the rear end of the fan is larger than the flow cross-section at the air outlet on the blowing pipe, so A flow surface is formed between the inner wall of the housing and the fan hub, and the ratio of the flow cross section at the air outlet on the blower pipe to the flow cross section of the flow surface where the fan is located is greater than or equal to 0.8. the

Further, the air duct from the fan to the air outlet section defines an outer contour line, and the included angle between the central axis and the outer contour line is less than or equal to 8 degrees. the

Further, the cross-sectional area of the air outlet of the blowing pipe is larger than 4300mm2. the

Further, the capacity of the battery is between 170wh-400wh. the

Further, the motor is a brushless DC motor, the fan is an axial flow fan, and the diameter of the brushless DC motor is less than or equal to 35mm. the

Further, the axial flow fan includes a hub mounted on the rotating shaft of the motor and a plurality of blades mounted on the hub, and the outer diameter of the axial fan is between 85mm-140mm. the

Further, the ratio of the air volume of the hand-held hair dryer to the diameter of the brushless DC motor is greater than 12 cfm/mm. the

Further, the housing includes a curved portion for turning the airflow, and the handle is arranged on the curved portion of the housing. the

Further, the housing, the channel assembly and the blower are roughly located on the same straight line, the blower defines a central axis in the length direction, the handle includes a grip part, and the grip part is distributed on the whole hair dryer On either side of the plane in which the center of gravity lies, said plane being parallel to said axis and perpendicular to the working ground. the

The ratio of the air volume to the input power of the hand-held hair dryer of the present invention is not less than 0.7 cfm/w, so the blowing efficiency of the whole machine is improved. the

Description of drawings

Fig. 1 is the schematic diagram of the three-dimensional structure of the hand-held hair dryer in the embodiment of the present invention;

Fig. 2 is a front view of the hand-held hair dryer in the embodiment of the present invention after part of the housing is removed;

Fig. 3 is the front view of the hand-held hair dryer in the embodiment of the present invention;

Fig. 4 is a top view of the hand-held hair dryer in the embodiment of the present invention;

Fig. 5 is a structural schematic diagram of the connection between the air inlet box and the duct assembly of the hand-held hair dryer in the embodiment of the present invention;

Fig. 6 is a structural schematic diagram of the handle of the hand-held hair dryer in the embodiment of the present invention;

Fig. 7 is a cross-sectional view of the channel assembly of the hand-held hair dryer in the embodiment of the present invention;

Fig. 8 is a perspective view of the channel assembly of the hand-held hair dryer in the embodiment of the present invention after removing part of the channel and the connecting pipe;

Fig. 9 is a curve showing the functional relationship between the outer diameter of the fan blade of the hand-held hair dryer and the blowing efficiency in the embodiment of the present invention.

Detailed ways

In order to understand the technical content of the present invention more clearly, the specific implementation manners and accompanying drawings are described as follows. the

Please refer to FIG. 1 and FIG. 2 , as a hand-held hair dryer 10 according to an embodiment of the present invention, it includes a housing 11, an air inlet box 12, a handle 13, a control assembly 14, a battery 15, a channel assembly 17 and a blowing pipe 19, wherein The duct assembly 17 and the battery 15 are respectively located on both sides of the housing 11 , the handle 13 is arranged on the housing 11 , the housing 11 is connected to the blowing pipe 19 through the duct assembly 17 , and the air inlet box 12 is located inside the housing 11 . the

Please refer to FIG. 3 at the same time. The housing 11 includes a housing chamber 110, a mounting portion 111, a main air inlet 112, an auxiliary air inlet 113, a side air inlet 114, and a curved portion 115. The housing chamber 110 is formed in the housing 11. The wind box 12 is installed in the accommodating chamber 110 , and one end of the duct assembly 17 is fixedly installed in the installation portion 111 . Both the main air inlet 112 and the auxiliary air inlet 113 are arranged at the bottom of the casing 11, and the side air inlet 113 is arranged on the side wall of the casing 11, the air flow enters through the main air inlet 112 or the auxiliary air inlet 113, and passes through the curved portion 115 After being guided, it flows into the duct assembly 17 from the installation part 111 . The side air inlet 114 has the function of assisting the air intake and can achieve a better air intake effect. Of course, the side air inlet 114 may not be required. the

Please refer to Fig. 5, the air inlet box 12 includes a bottom air inlet 120, a rear air inlet 121, a side air inlet 122 and an air outlet 123, wherein the bottom air inlet 120 and the rear air inlet 121 are both The fence-shaped structure, and the rear air inlet 121 is set as a slope structure corresponding to the curved part 115 on the housing 11, the air outlet 123 of the air inlet box 12 and the air inlet end of the duct assembly 17 (not shown in the figure) At this time, the air inlet box 12 and the duct assembly 17 form an independent working unit 18. The bottom air inlet 120, the rear air inlet 121, and the side air inlet 122 on the air inlet box are connected with the air outlet 123 respectively. A plurality of blowing passages are formed, so no matter how the casing 11 changes, as long as the independent working unit 18 can be packed into the casing and form a blowing passage, the machine can realize the blowing function. In this way, the appearance of the hand-held hair dryer can be quickly changed without changing the internal working unit. In the embodiment of the present invention, the main air inlet 112 on the casing 11 forms the first blowing channel together with the bottom air inlet 120 and the air outlet 123 of the blowing box 12, and the auxiliary air inlet 113 on the casing 11 and the blower The rear air inlet 121 and the air outlet 123 of the box 12 together form the second blowing passage, and the side air inlet 114 on the housing forms the third air blowing together with the side air inlet 122 and the air outlet 123 of the blowing box 12. aisle. the

Please refer to FIG. 1, FIG. 2, FIG. 4 and FIG. 6 at the same time. The handle 13 is used to hold the hand-held hair dryer 10, which is located above the housing 11 and the battery 15 and is installed on the curved portion 115 of the housing 11. The handle 13 It includes a grip part 130 , a battery installation part 131 and a speed regulation part 132 , wherein the grip part 130 is located between the battery installation part 131 and the speed regulation part 132 . the

In the embodiment of the present invention, a central axis L1 is defined along the length direction on the blowing pipe 19, and the center of gravity G of the blower as a whole is located on a plane P1, which is perpendicular to the working ground P2 and parallel to the axis L1. The housing 11, the battery 15, the duct assembly 17 and the blower 19 are roughly located on the same straight line, and the grips 130 on the handle 13 are distributed on both sides of the above-mentioned plane P1. Preferably, the grips 130 are symmetrically distributed on Both sides of plane P1. The structure is compact, and the center of gravity is close to the grip part, which reduces the force required to overcome the deflection of the hand-held hair dryer during use, increases the comfort of hand-holding, and reduces the fatigue of hand-holding during long-term use. Of course, the battery can also be arranged above or below the casing 11, the casing 11, the channel assembly 17 and the blowing pipe 19 are roughly located on the same straight line, and the grip part 130 on the handle 13 is distributed on the plane where the center of gravity is (not shown in the figure) The plane is parallel to the axis of the blowing pipe 19 and perpendicular to the working ground P2, which is defined as a horizontal plane. the

The control assembly 14 is used to control the opening and closing of the hand-held hair dryer and the size of the rotating speed, which includes a trigger 140 for controlling the opening and closing of the hand-held hair dryer, a locking button 141 for preventing the hand-held hair dryer from mis-starting, and an amplifying button for controlling the hand-held hair dryer to operate at the maximum speed 142 and the speed regulating knob 143 for adjusting the rotating speed of the hand-held hair dryer motor 172, wherein the speed regulating knob 143 is located on the speed regulating part 132. For the convenience of operation, wherein the trigger 140, the locking button 141 and the magnifying button 142 are all arranged on the grip part 130, such position setting can ensure that the operator can operate the magnifying button 142 with the thumb while pressing the trigger 140. If it is necessary to work under high-speed blowing conditions for a long time, the operator can also press the magnifying button 142 and the locking button 141 through the palm of the hand while holding the handle 13, and in addition partially press the trigger 140 through the fingers, so that the hand-holding can be completed only by one-handed operation. Start the hair dryer and keep it running at the maximum speed to reduce hand fatigue during use and increase grip comfort. Wherein the lock button 141 is only an auxiliary switch set to prevent misoperation from starting the hand-held hair dryer. It is conceivable that there is no lock button 141, and only the trigger 140 and the enlargement button 142 are used to complete the start-up process of the hand-held hair dryer and keep it running continuously. . the

The battery 15 is installed on the casing 11 through the battery mounting part 131, and is used to provide power to the hand-held hair dryer. It is connected with the spring 117 and can rotate relative to the casing. When the battery 15 is installed on the casing 11, the front end of the battery 17 pushes the pop-up head 116 to overcome the elastic force of the spring 117 and rotate to a predetermined position. When the battery 15 is removed At this time, the pop-up head 116 pushes the battery 15 out toward the direction of disassembly under the elastic force of the spring 117 . the

The battery mounting part 131 is provided with a battery lock 1311. The battery lock 1311 is used to lock the battery 15 on the housing 11. The battery lock 1311 is linked with a release button 1312. By pressing or pushing the release button 1312, the The linkage drives the battery lock 1311 to separate from the battery 15, and then the battery 15 can be easily disassembled under the action of the pop-up head 116. Certainly, the battery mounting part 131 can also be arranged on the housing 11 , as long as it can perform the function of locking the battery 15 on the battery mounting seat provided on the housing 11 when installing the battery 15 . the

Please refer to Fig. 7 and Fig. 8, duct assembly 17 comprises the connecting pipe 170 that links to each other with blowing pipe 19, the duct 171 that links to each other with housing 11, and motor 172 and fan 173, motor 172 is connected with control assembly 14 on the wire The trigger 140 is connected, the connecting pipe 170 and the channel 171 are engaged with each other, the connecting pipe 170 and the channel 171 are provided with a support ring 174 for accommodating the motor 172, the motor 172 is installed in the support ring 174, and the output shaft of the fan 173 and the motor 172 Connected, the connecting pipe 170 and the channel 171 are uniformly formed with a number of divergent air guide ribs 175, one end of the air guide rib 175 is connected to the inner wall of the connecting pipe 170 or the channel 171, and the other end is connected to the supporting ring 174, At least one of the air guiding ribs 175 is provided with a channel 176 through which the wires of the power supply 172 pass. This not only increases the reliability of wire positioning, but also reduces wind resistance, and no new parts are added, and the fixing of wires during assembly is simple, reliable and convenient. It can be understood that if the length of the bypass 171 is sufficient, the support ring 174 and the air guide rib 175 can be directly arranged on the bypass 171 without connecting the pipe 170 . The duct 171 has an air inlet part 1711. In order to reduce the noise at the duct inlet part 1711, the duct air inlet part 1711 is set as a lip structure that facilitates air guide. The above lip structure can be integrally formed with the duct 171 or A separate part is formed and mounted on the channel 171 . the

In the embodiment of the present invention, the fan 173 is an axial flow fan, the motor 172 is a brushless DC motor, and the fan 173 is driven by the motor 172, which includes a hub 1731 mounted on the motor rotating shaft (not shown in the figure), and multiple mounted To the blades 1732 on the above-mentioned hub 1731, the blades 1732 and the hub 1731 can be integrally formed, or can be formed separately and assembled together. the

The fan 173 is provided with a fairing 177 near one end of the housing 11, and the motor 172 is connected to the fan 173 near the end of the blowing pipe 19. Since the fan 173 is an axial flow fan, the air flow enters through the first blowing passage and the second and third blowing passages. Behind the fan 173 , under the action of the fan 173 , the axial direction passes through the air guide rib 175 and flows into the blowing pipe 19 . In the embodiment of the present invention, the support ring 174 includes a housing part 1741 for housing the motor 172 and an air guiding part 1742. Formed in one piece, the air guide part 1742 is set on the supporting ring 174 near the end of the blowing pipe 19, and the air guide part 1742 is provided with a number of air inlet holes (not shown in the figure) for the inflow of cooling air. During the blowing process, since the air pressure around the motor 172 is higher than the air pressure near the fan 173, a secondary air flow is generated under the effect of the pressure difference, and the secondary air flow flows into the support ring 174 through the air inlet hole on the air guide part 1742 to cool the motor 172 The inside finally flows out through the opening at the front end of the receiving portion 1741 , so that the motor 172 can be cooled during the blowing process. the

Please refer to Fig. 3 again, in order to be portable, the hand-held hair dryer of the present invention is also provided with straps (not shown in the figure), and the two ends of the straps are respectively connected to two lanyard holes 118, 119 arranged on the housing 11. The distances from the two lanyard holes 118, 119 to the center of the grip portion 130 are substantially the same, and the midpoint of the line connecting the two lanyard holes 118, 119 is located near the center of gravity of the machine. the

The hand-held DC blower is mainly used to blow the fallen leaves and small garbage near the ground, the stadium and the stands. According to the research, in order to blow a large number of fallen leaves on the ground and some garbage in the cracks, the air volume of the hand-held blower is usually greater than 395cfm. . Due to the limitations of small battery capacity and low air output efficiency of the hand-held DC hair dryers on the market with battery packs installed on the housing, it is difficult for the hair dryer to achieve the performance of air volume greater than 395cfm and working time greater than 5min. index. Therefore, in order to achieve greater air volume and higher blowing efficiency, it is necessary to optimize the battery capacity, brushless DC motor, axial flow fan parameters and air duct design. the

In order to achieve the ideal air volume and working time, the capacity of the battery is usually greater than 170wh. Usually, the capacity of the battery is proportional to its own weight. For a hand-held hair dryer, due to the weight requirement of the whole machine, the battery pack capacity is preferred. The range is between 170wh-400wh. This setting is because on the one hand, if the capacity of the battery pack is too small, it cannot meet the requirements of air volume and working time; on the other hand, if the capacity of the battery pack is too large, the hand-held fatigue will It will increase, which is not conducive to the operator to work for a long time. the

Table 1 lists the effective working time of the hand-held hair dryer when the battery capacity is 200wh and 300wh at the maximum air volume operation and the minimum air volume operation. It can also be seen from Table 1 that when the battery capacity is constant, the air volume is inversely proportional to the working time, that is to say, the greater the air volume, the shorter the working time. According to ergonomics, and through the analysis of a large number of simulation experiments on the weight of the whole machine and the tolerance of people, the performance parameters of the hand-held DC hand-held hair dryer that are more suitable for the use of mass customers are: the air volume is between 385cfm-700cfm The working time is between 20min-75min. the

Table 1 battery capacity Maximum air volume Minimum air volume 200wh 36min 120min 300wh 54min 180min

In the case of a certain battery capacity, in order to obtain a hand-held DC hand-held hair dryer with an air volume greater than 395cfm and higher blowing efficiency, it is necessary to optimize the parameters of the brushless DC motor, axial fan, and air duct design. the

Please refer to Fig. 7 and Fig. 8 again, the motor 172 is accommodated in the support ring 174 provided on the channel 171 and the connecting pipe 170, the hub 1731 of the axial flow fan 173 is installed on the rotating shaft (not shown) of the motor 172, according to Aerodynamic principles, in order to reduce wind resistance and increase wind speed, the outer contours of fairing 177, hub 1731 and support ring 174 are designed to be streamlined, so the diameter of motor 172 also determines the diameter of hub 1731. In addition, when designing an axial flow fan, the ratio of the root diameter of the blade to the top diameter, that is, the ratio of the fan hub diameter to the outer diameter of the blade, hereinafter referred to as the hub ratio, is a very important parameter. For the same impeller outer diameter, the hub is smaller The blade length is more suitable for axial flow fans with low pressure and high flow. According to the simulation analysis, the hub ratio is between 0.25-0.45, and the air outlet efficiency of the fan blades is relatively high. Therefore, if the diameter of the motor is larger, the corresponding diameter of the hub will also be larger. In order to keep the hub ratio parameter within the optimal range, thereby obtaining a higher air outlet efficiency, the diameter of the blade increases accordingly, which leads to an increase in the volume of the channel. , The volume of the whole machine is also increased, so both the shape design and the operating comfort in the actual use process will be adversely affected, so the preferred motor diameter is not greater than 35mm, so that the weight of the whole machine is lighter and the space occupied is smaller. According to the range of the wheel-to-hub ratio, it can be further concluded that the outer diameter of the blade is between 78mm-140mm, so that the blowing efficiency is higher. As shown in Figure 9, C1 and C2 are when the air volume is 560cfm and 500cfm respectively. The graph of the functional relationship between the outer diameter of the blade and the blowing efficiency obtained from the model analysis shows that the blowing efficiency is the best when the outer diameter of the blade is 85mm-140mm, and the blowing efficiency here is defined as the work generated by the air flow and the rotation of the fan blade The ratio of the work expended. the

Furthermore, since the diameter of the motor is less than 35mm, and the ratio of the air volume to the diameter of the motor is greater than 12cfm/mm, compared with ordinary hand-held hair dryers, the hand-held hair dryer of the present invention obtains a more powerful blowing effect through a small-volume motor. the

The air duct design of the present invention is described in detail below, please refer to Fig. 2 again, along the direction of the axis L1, the flow cross section S1 of the air duct near the air inlet 112 at the rear end of the fan 173 is larger than the air outlet on the blowing pipe 19 The flow cross-section S3 at position 191, and an annular flow surface (not shown) is formed between the inner wall of the channel 171 and the fan hub 1731, the flow cross-section S3 at the air outlet 191 on the blowing pipe 19 is connected to the axial flow fan 173 The ratio between the flow cross-sections S2 of the annular flow surface at the position is preferably greater than or equal to 0.8, such setting can effectively improve the flow characteristics of the airflow and increase the blowing efficiency. At the same time, the section of the air duct from the fan 173 to the air outlet 191 defines an outer contour line L2, and L1 and L2 define an included angle. Preferably, the angle between the axis L1 and the outer contour line L2 is less than 8 degrees. This is because the larger the angle is, the greater the airflow resistance is, so the airflow loss of the air duct wall increases, and the air flowing in the blowing pipe 19 The loss of the high-speed airflow increases, resulting in a decrease in the blowing efficiency of the whole machine. Through the optimization of the above two parameters, a favorable air flow condition can be realized and a small pressure loss in the blowing pipe 19 can be realized, effectively improving the blowing efficiency. the

In order to achieve sufficient air output at the air outlet 191, after CFD (computational fluid dynamics) analysis and test data summary, a larger air outlet area is usually designed. Preferably, the cross-sectional area of the air outlet 191 is set to be greater than 4300mm2. Of course, as the blowing area increases, the wind speed will decrease accordingly. After the actual operation, the optimal air outlet area is set to 4300mm ² to 8000mm ² .

Through the optimization of the battery capacity, brushless DC motor, parameter design of the axial flow fan and the improvement of the air duct design in the present invention, when the battery capacity is between 170wh-400wh, the air volume of the hand-held hair dryer can reach more than 395cfm, Especially when the air volume is 430-700cfm, it can still meet the working time of more than 5min. At the same time, it can ensure that when the hair dryer is running at the maximum air volume, the ratio of the air volume to the input power is greater than or equal to 0.7cfm/w, and the blowing efficiency is greatly improved. the

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims. the

Claims (10)

1. hand blower, comprise housing, handle, battery and blower, be provided with air inlet and Yi Gehan road assembly on described housing, described letter road assembly comprises and is connected the De Han road with housing and is installed to motor and fan in the letter road, described housing is connected on blower by letter road assembly, described battery is arranged on housing, it is characterized in that: when described hand blower moved with maximum quantity of wind, the ratio of described air quantity and input power was more than or equal to 0.7cfm/w.

2. hand blower according to claim 1, it is characterized in that: defined a central axis on described blower, along the direction of axis the rear end of fan near the flow cross section in the air channel at air inlet position greater than blower on the area of flow cross section at air outlet position, form a circulating face between described inner walls and fan hub, the ratio on blower between the flow cross section of the flow cross section at air outlet position and fan present position circulating face is more than or equal to 0.8.

3. hand blower according to claim 2 is characterized in that: described fan is to outer contour of air channel definition of air outlet section, and the angle of described central axis and described outer contour is less than or equal to 8 and spends.

4. hand blower according to claim 2, it is characterized in that: the cross-sectional area at described blower air outlet position is greater than 4300mm2.

5. hand blower according to claim 1, it is characterized in that: the capacity of described battery is between 170wh-400wh.

6. hand blower according to claim 1, it is characterized in that: described motor is brshless DC motor, and described fan is aerofoil fan, and the diameter of described brshless DC motor is less than or equal to 35mm.

7. hand blower according to claim 6, it is characterized in that: described aerofoil fan comprises the wheel hub and a plurality of blade that is installed on wheel hub that are installed on electric machine rotational axis, and the external diameter of described aerofoil fan is between 85mm-140mm.

8. hand blower according to claim 6, it is characterized in that: the ratio of institute's hand-held blow fan delivery and brshless DC motor diameter is greater than 12cfm/mm.

9. hand blower according to claim 1 is characterized in that: described housing include the air feed circulation to sweep, described handle is arranged on the sweep of housing.

10. hand blower according to claim 1, it is characterized in that: described housing ,Han road assembly and blower roughly are located along the same line, described blower has defined a central axis in the longitudinal direction, described handle comprises grip part, described grip part distributes in the both sides on the whole plane, center of gravity place of hair-dryer, described plane parallel is in described axis, and vertical with work ground.

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