CN212077761U - Hair drier - Google Patents

Abstract

A hair dryer, comprising: a blower main body including a main body case accommodating therein a fan and a motor driving the fan to rotate, a rotation shaft of the fan defining a longitudinal axis, a blowpipe removably attached to the blower main body, wherein a first sound absorbing member is provided in the blower main body, the first sound absorbing member including a sound absorbing material and a mounting bracket for mounting the sound absorbing material, an air flow passage is defined in a hollow portion of the mounting bracket, and a sound absorbing opening is formed on the mounting bracket to allow an air flow through the air flow passage to contact the sound absorbing material.

Description

Hair drier

Technical Field

The utility model relates to a hair-dryer, in particular to hair-dryer for the gardens operation.

Background

The garden blower is mainly used for blowing fallen leaves, road surface dust, accumulated water, snow and the like. Common types of blowers include centrifugal blowers and axial blowers. Centrifugal blowers typically include a housing, a motor mounted within the housing, and a centrifugal fan. The shell is provided with an air inlet, an air outlet and a channel communicated with the air inlet and the air outlet, and the centrifugal fan is positioned in the channel. The centrifugal fan is driven by the motor to generate high-pressure airflow, and the airflow leaves from the air outlet to be blown and swept. Centrifugal blowers use motors that are bulky, resulting in an overall blower weight that is high.

An axial flow hair dryer typically includes a housing, a motor mounted within the housing, and an axial flow fan. The motor drives the axial flow fan to rotate, and air entering the blower is pushed to move along the axial direction of the blower and is discharged from the tail end of the air blowing pipe. Axial flow blowers are lighter and have better heat dissipation than centrifugal blowers because the air flow through the motor during the passage through the blower acts to cool the motor.

However, a common drawback of both centrifugal and axial blowers is the high amount of noise generated during use. Since the hair dryer is generally held by a user, the distance between the noise source and the user is short, and it is easy for a person who frequently operates the hair dryer to work in a high noise environment for a long time to cause discomfort, and in a serious case, hearing may be affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a hair drier, its noise that can reduce the production when using, and promote the efficiency of blowing.

In order to achieve the above object, the present invention provides a hair dryer, comprising: a blower main body including a main body case accommodating therein a fan and a motor driving the fan to rotate, a rotation shaft of the fan defining a longitudinal axis, a blowpipe removably attached to the blower main body, a first sound-absorbing member provided in the blower main body, the first sound-absorbing member including a sound-absorbing material and a mounting bracket for mounting the sound-absorbing material, a hollow portion of the mounting bracket defining an airflow passage, and a sound-absorbing aperture formed on the mounting bracket to allow an airflow passing through the airflow passage to contact the sound-absorbing material.

In a preferred embodiment, a plurality of first sound absorbing members each having a sound absorbing material and a mounting bracket are provided in the blower main body, and the plurality of first sound absorbing members are positioned in a shield at an air inlet of the blower main body.

In a preferred embodiment, the mounting bracket has a hexagonal cross-section and each face of the mounting bracket has a plurality of sound absorbing apertures formed therein. The protective cover is configured as a honeycomb grid, and each first sound-absorbing member is aligned with one of the mesh cells in the honeycomb grid.

In a preferred embodiment, the mounting frame includes a mounting frame body defining the airflow passage and edge portions at both ends of the mounting frame body, the edge portions extending in a radial direction from the mounting frame body, the sound-absorbing material being removably mounted on the mounting frame body, the edge portions restricting movement of the sound-absorbing material. The sound absorbing material has a cross section matching a cross section of the mounting bracket, and the sound absorbing material has a non-fully closed profile to facilitate fitting onto and removal from the mounting bracket. The ratio of the cross-sectional area of the airflow passage to the cross-sectional area of the area surrounded by the outer edge of the sound-absorbing material is 0.5 to 0.7. The sound absorbing material is selected from sponge, foam plastic and foam metal.

In a preferred embodiment, the blower main body includes an air inlet side casing and an air outlet side casing which are located inside the main body casing and connected to each other. The shield is attached to the proximal end of the air inlet side shroud, and at least a portion of the first plurality of sound absorbing elements extend into the proximal end of the air inlet side shroud. The inlet side shroud has a first inner ring and a plurality of first vanes extending from the first inner ring, the outlet side shroud has a second inner ring and a plurality of second vanes extending from the second inner ring, the motor is housed in the first inner ring and/or the second inner ring, the plurality of first vanes are aligned with the plurality of second vanes along the longitudinal axis to form a plurality of guide vanes. The distal edge of the at least one second vane is a non-flat surface.

In a preferred embodiment, at least one of the guide vanes is a hollow guide vane, and a chamber inside the hollow guide vane communicates a space in the first inner ring and the second inner ring with a space outside the inlet-side shroud and the outlet-side shroud.

In a preferred embodiment, the air outlet housing comprises a distally tapering conical flow conductor, the surface of which is provided with a plurality of openings and/or the tip of which forms an opening.

In a preferred embodiment, a plurality of elastic positioning elements are distributed at intervals in the circumferential direction on the outer surface of the air outlet side housing and/or the air inlet side housing, in order to position the air outlet side housing and/or the air inlet side housing centrally in the main housing.

In a preferred embodiment, the hair dryer further comprises a second sound-absorbing member located between a distal end of the air-outlet-side shroud and a distal end of the main body casing and at least partially surrounding the cone-shaped flow guide, or the second sound-absorbing member is located in the blowpipe.

In a preferred embodiment, the hair dryer further comprises a handle connected to the main body casing, and a circuit board provided in the main body casing on a side close to the handle, the main body casing having a vent formed therein at a position adjacent to the circuit board. The hair dryer further includes a battery pack removably mounted to the main body casing, and a straight line connecting a center of gravity of the battery pack and a center of gravity of the motor passes through the grip portion of the handle as viewed from the side.

In a preferred embodiment, the battery voltage of the blower is 40V, the battery capacity is 2.6Ah-6.0Ah, the maximum air volume of the blower is more than 500cfm, the maximum input power is more than 800W, the continuous working time when the blower operates with the maximum air volume is more than 10 minutes, the diameter of the motor is 30-35mm, the outer diameter of the fan is 85-90mm, the ratio of the cross-sectional area of the air outlet of the air blowing pipe to the flow cross-sectional area of the position where the fan is located is 0.8-0.9, and the included angle between the straight line of the outer surface of the air blowing pipe and the longitudinal axis is 1-2 degrees.

In a preferred embodiment, the battery voltage of the blower is 18V, the battery capacity is 2.0Ah-6.0Ah, the maximum air volume of the blower is more than 400cfm, the maximum input power is more than 400W, the continuous working time when the blower operates with the maximum air volume is more than 9 minutes, the diameter of the motor is 30-35mm, the outer diameter of the fan is 80-85mm, the ratio of the cross-sectional area of the air outlet of the air blowing pipe to the flow cross-sectional area of the position where the fan is located is 0.85-0.9, and the included angle between the straight line of the outer surface of the air blowing pipe and the longitudinal axis is 0.4-1 degree.

Drawings

Figure 1 shows a hair dryer according to one embodiment of the present invention.

Figure 2 shows a blower body of the blower of figure 1.

Figure 3 shows a barrel of the hair dryer of figure 1.

Fig. 3A shows a side of the barrel in fig. 3.

Figure 4 shows a protective cover for the hair dryer of figure 1.

Fig. 5 shows a first sound-absorbing element arranged inside the protective cover.

Fig. 5A shows a mounting bracket of the first sound-absorbing member.

Fig. 5B shows the sound-absorbing material of the first sound-absorbing member.

Fig. 5C shows an arrangement of the plurality of first sound-absorbing members.

Fig. 6 shows a wind inlet side cover in a blower main body.

Fig. 6A shows an end surface of the intake side cover in fig. 6.

Fig. 6B shows a distal portion of the inlet side cover in fig. 6.

Fig. 6C shows a modification of the intake side cover.

Fig. 7 shows one side of the air-outlet side cover in the blower main body.

Fig. 7A shows the other side of the air-out side cover in the blower main body.

Fig. 8 shows a cross section of the assembled inlet side housing of fig. 6 and outlet side housing of fig. 7.

Figure 9 shows the internal structure of the blower body of figure 2.

Figure 10 shows a cross-section of the blower of figure 1.

Figure 10A shows a cross-section of a blower according to another embodiment.

Detailed Description

Fig. 1 shows a hair dryer 100 according to an embodiment of the present invention, which is an axial flow hair dryer, including a hair dryer body 200 and a blower pipe 300 mounted on the hair dryer body 200. The blower main body 200 houses therein a fan and a motor that drives the fan to rotate. In the non-use state, the user may remove the blowpipe 300 from the blower main body 200 to reduce the storage space. In this embodiment, the detachable connection between the blower main body 200 and the blower pipe 300 is achieved by the snap connection 210. It should be understood that other detachable connections are possible and are within the scope of the present invention.

For convenience of description, a line along which the rotational axis of the fan in the hair dryer 100 is located is defined as a longitudinal axis, and a side facing the air outlet of the blower pipe 300 is referred to as a distal side, and a side facing the air inlet of the hair dryer body 200 is referred to as a proximal side. In fig. 2, a blower body 200 is shown, comprising a body housing, which is preferably made of two housing halves. The body housing may be divided along a longitudinal axis into a distal portion 211, a middle portion 212, and a proximal portion 213, with the interface of the distal portion 211 and the middle portion 212 forming a step 214.

In fig. 3 is shown a blower pipe 300, which along a longitudinal axis may be divided into a distal portion 301 and a proximal portion 302, the interface of which also forms a step 303. When mounted, the distal part 211 of the body shell is inserted into the blower pipe 300 until the distal edge of the distal part 211 abuts the step 303 of the blower pipe 300, while the proximal edge of the proximal part 302 of the blower pipe 300 abuts the step 214 of the body shell. The proximal portion 302 of the barrel 300 has formed thereon a mounting portion 307 of the snap connection 210. Preferably, at least one locating feature, such as a rib 215, is formed on the outer surface of the distal portion 211 of the body shell and a corresponding locating feature, such as a shoulder 304, is formed on the proximal portion 302 of the barrel 300. In an embodiment not shown, there is no step between the distal portion and the proximal portion of the barrel 300, the barrel 300 extending substantially smoothly in the longitudinal axial direction.

Fig. 3A is a side view of the blowpipe 300. The plane P1 in which the distal edge 308 of the distal portion 301 of the blower pipe lies is inclined at an angle a, viewed from the side, in relation to a plane P perpendicular to the longitudinal axis, so that the upper side of the blower pipe 300 extends a greater distance in relation to the lower side. The angle a is less than 30 degrees, preferably 5-25 degrees, more preferably 15-20 degrees. In general, when a user performs work by holding a hair dryer, the angle "a" tends to concentrate wind force on a target area. Also seen from the side, the line in which the outer surface 310 of the blower pipe lies makes an angle b with the longitudinal axis which is smaller than 5 degrees, preferably smaller than 2 degrees, more preferably 0.4-1.2 degrees. An excessively large angle b results in a significant reduction in the area of the supply opening, which excessively increases the wind force at the supply opening, may undesirably blow up objects of greater weight, and may also exert greater pressure on the inner wall of the blower pipe in the vicinity of the supply opening. The provision of a base support 305 at the proximal portion 302 of the barrel 300 allows for stable seating of the hair dryer on the ground, preventing wear of the outer surface of the barrel. Further alternatively, a protrusion 306 may be provided at the bottom of the distal edge of the barrel, the bottom support 305 and the protrusion 306 enabling smooth support of the barrel 300 when the barrel is placed alone.

Returning to fig. 2, where the shield 220 is shown, the shield 220 is attached to the proximal portion 213 of the main body housing. The air flow enters the blower body 200 through the shield 220. The protective cover 220 is configured as a polygonal grid, preferably a honeycomb grid as shown in fig. 4. The honeycomb arrangement of open cells helps to comb the turbulent air flow into inlet air flows that are parallel to each other. A honeycomb arrangement can save material over a triangular or square arrangement. The number of opening units in the grill may be determined according to parameters and sizes of the power, air volume, length of the blowing duct, shape of the air inlet, etc. of the blower. The number of opening units is not preferred to be excessive because a densely arranged grille will undesirably reduce the actual air intake area and it is difficult to obtain parallel air flow. The shield cap 220 shown in fig. 4 has seven hexagonal opening units 221. For safety reasons, and to avoid smaller objects from entering the blower body 200 with the air stream, a plurality of division bars 222, 223 may be provided on each hexagonal cell. Further, the bottom of the shield 220 has a support portion 224, and the support portion 224 prevents the main body casing from contacting the ground when the blower is rested on the ground.

Fig. 5 shows a first sound-absorbing member 400 for reducing noise. In the present embodiment, the first sound-absorbing member 400 is disposed inside the shield cap 220. The first sound-absorbing member 400 includes a sound-absorbing material 410 and a mounting bracket 420 for mounting the sound-absorbing material. Fig. 5A shows a mounting bracket 420 that is a hollow structure defining an airflow passage therein parallel to the longitudinal axis. The sectional shape of the mounting bracket 420 is designed to conform to the unit openings of the polygonal lattice in the shield 220. The mounting bracket 420 may be formed of multiple pieces or may be integrally formed. In fig. 5A, two mount halves 420a, 420b are shown, which are combined together by a connecting piece 421 to form a mount. For the convenience of assembly, each opening unit 221 in the shield cap 220 corresponds to one first sound-absorbing member 400. The mount 420 includes a mount frame 422 and rim portions 423 at both ends of the mount frame 422, the mount frame 422 defining an air flow passage, the rim portions 423 extending radially from the mount frame 422.

Shown in fig. 5B is sound absorbing material 410, which may have a porous structure, such as a sponge, foam, metal foam, or the like. The sound absorbing material 410 is removably mounted on the mounting frame 422, and the movement of the sound absorbing material 410 is restricted by the edge portion 423. In order to contact the air flow with the sound absorbing material 410, a sound absorbing opening 424 is formed in the mounting bracket 420, and penetrates the mounting frame 422.

Arranging the sound-absorbing materials 410 on the outer circumference of the mounting bracket 420 is advantageous in that the sound-absorbing materials 410 of the adjacent first sound-absorbing members 400 contact each other after the assembly is completed, which increases the sound-absorbing effect of the sound-absorbing materials. Taking fig. 5C as an example, the sound-absorbing material of the first sound-absorbing member 400a located in the middle contacts the sound-absorbing material of the adjacent first sound-absorbing members 400b to 400g on all six surfaces. The sound-absorbing materials of the remaining six sound-absorbing members 400b to 400g each contact the sound-absorbing material of the adjacent first sound-absorbing member on three surfaces. Further, disposing the sound-absorbing material on the outer circumference of the mounting bracket 420 can prevent the sound-absorbing material 410 from falling off due to vibration. The mounting bracket 420 also protects the sound-absorbing material 410 from being impacted by an accidental inhalation, and prolongs the life of the sound-absorbing material.

In the present embodiment, a plurality of sound absorbing apertures 424 are formed on each surface of the mounting bracket 420. The shape of the sound-absorbing apertures 424 is not limited to the racetrack shape shown in fig. 5A. The sound absorbing material 410 has a cross-section matching that of the mounting bracket 420. Preferably, the sound absorbing material has a non-fully closed profile, and in fig. 5B there is shown a gap 411 between the two ends of the sound absorbing material, which gap is expandable to facilitate fitting and removal of the sound absorbing material onto and from the mounting bracket by a user.

For a single sound absorbing element, such as sound absorbing element 400e in fig. 5C, the ratio of the cross-sectional area a1 of the airflow passage defined by the inner edge 425 of the mounting bracket to the cross-sectional area a2 bounded by the outer edge 412 of the sound absorbing material is a1/a2 of between 0.3 and 0.7, preferably between 0.5 and 0.7, more preferably between 0.5 and 0.6. Too small a ratio will affect the air intake of the hair dryer, and too large a ratio will be detrimental to noise reduction.

In fig. 6, there is shown an air inlet side cover 500 which is located inside the main body casing of the blower main body. The air flow passes through the hood 220 and the first sound-absorbing member 400 and then enters the wind inlet side cover 500. The air inlet side shroud 500 includes a proximal portion 510 and a distal portion 520, the proximal portion 510 being connected to the distal end of the shroud 220. Preferably, when assembled, at least a portion of the first sound absorbing member 400 extends into the proximal end 511 of the proximal portion 510 of the inlet side shroud 500. The inlet side case 500 further includes a positioning member 530 which is engaged with a corresponding positioning member formed on the main body case to ensure that the inlet side case 500 is mounted at a predetermined position in the blower main body 200.

The cross section of the proximal portion 510 of the wind inlet side cover 500 cannot be used for the whole wind inlet because a part of the air is blocked by the grill of the shield cover 220 and the first sound absorbing member 400. In order to maintain the flow rate of the air flow entering the inlet side case 500, the inlet side case 500 is designed such that its cross section is reduced in the distal direction. In this embodiment, the proximal portion 510 has a gradually decreasing cross-section and smoothly transitions to the distal portion 520, with the cross-section of the distal portion 520 being substantially constant. Fig. 6A is an end view of the intake side cover 500. The inner diameter at the proximal end of the proximal portion 510 is d1 and the inner diameter of the distal portion 520 is d2, with the ratio d1/d2 between 1.2-2.5, preferably 1.5-2, more preferably 1.7-1.8.

Fig. 6B shows a distal portion 520 of the intake side shroud 500 in which a first inner ring 521 is formed, with a plurality of first vanes 523 extending radially outward from the first inner ring 521 to an inner wall of the distal portion 520. The first inner ring 521 is used to house a portion of the motor. The distal portion 520 is formed with at least one first notch 522, 524 extending radially outward from the first inner ring 521 to the outer wall of the distal portion 520. The first slit communicates a space for accommodating the motor with a space outside the wind inlet side cover case 500.

A variation of the air inlet side shroud 500 ' is shown in fig. 6C, which again includes a proximal portion 510 ' and a distal portion 520 ', but which are separate components from one another. Since the proximal portion 510 'houses the fan therein, the proximal portion 510' may vibrate when the fan is rotated at high speed. To avoid vibrations causing the proximal portion 510 ' to strike the distal portion 520 ', a gap 530 ' is left between the two. The size of the gap 530' is 1-2mm, preferably 1.5-2mm, more preferably 1.7-1.8 mm.

In fig. 7, a wind-side cover 600 is shown, which is located inside the main body casing of the blower main body. The air flow enters the outlet side case 600 after passing through the shield 220, the first sound absorbing member 400 and the inlet side case 500. The outlet side case 600 further includes a positioning member 630 engaged with a corresponding positioning member formed on the main body case to ensure that the inlet side case 600 is mounted at a predetermined position in the blower main body 200.

Similar to the distal portion 520 of the inlet side casing 500, a second inner ring 621 is formed in the outlet side casing 600 shown in fig. 7A, and a plurality of second stationary vanes 623 extend radially outward from the second inner ring 621 to the inner wall of the inlet side casing 600. The second inner ring 621 is for housing a portion of the motor. The outlet-side housing 600 is formed with at least one second cut 622, 624, which extends radially outwards from the second inner ring 621 to the outer wall of the outlet-side housing 600. The second slit communicates a space for accommodating the motor with a space outside the wind inlet side cover 600. Also formed on the air outlet side casing 600 is a protrusion 625 that extends proximally along the longitudinal axis.

The intake side cover 500 and the exhaust side cover 600 are detachably coupled. In this embodiment, the air outlet side cover 600 is inserted into the distal end of the air inlet side cover 500, and the locking between the covers 500, 600 is achieved by the snap-fit between the connection parts 540, 640. After the assembly is completed, the plurality of first stationary blades 523 of the inlet-side shroud 500 are aligned with the plurality of second stationary blades 623 of the outlet-side shroud 600. Fig. 8 shows a sectional view of the inlet side case 500 and the outlet side case 600 after the assembly is completed. The first stationary blade 523 is axially aligned and continuous with the second stationary blade 623, which together form a guide vane. The first notches 522, 524 and second notches 622, 624 are also axially aligned and continuous. The protrusion 625 of the outlet side housing 600 closes the first and second cut-outs to form a chamber that allows the passage of electrical wires that can deliver power to the motor and air flow that can carry away heat from the motor. The portion defining the chamber may be considered a hollow flow guide vane. Since the chamber is closed, the flow therein does not affect the working air flow flowing along the longitudinal axis.

In the embodiment shown in fig. 6 to 8, the first inner ring 521 of the inlet-side housing 500 and the second inner ring 621 of the outlet-side housing 600 each accommodate a portion of the motor. It is contemplated that either the first inner ring 521 or the second inner ring 621 houses the entire motor alone.

The air outlet side casing 600 shown in fig. 7 further comprises a distally tapering conical flow conductor 610, on the surface of which a plurality of openings 611 are formed for introducing an air flow into the second inner ring 621 and the first inner ring 521 for cooling the motor. In an embodiment not shown, the tip 612 of the conical flow conductor forms an aperture to introduce a cooling airflow. Preferably, the distal edge 624 of the second vane 623 is a non-smooth surface, such as a wavy or serrated surface. The non-flat distal edge can further reduce noise compared to a smooth surface.

Fig. 9 shows the internal structure of the blower main body 200. The elastic positioning members 550, 650 are circumferentially distributed on the outer surface of at least one of the housings 500, 600 at intervals from each other, preferably mounted on the positioning portions 550, 650 of the outer surface (shown in fig. 6, 7). The thickness of the elastic positioning member 550, 650 is slightly greater than the radial distance between the outer wall of the cover 500, 600 and the inner wall of the body case, so that the elastic positioning member 550, 650 is pressed between the outer wall of the cover and the inner wall of the body case, thereby positioning the cover 500, 600 centrally in the body case, resisting vibration and reducing noise.

Also housed within the blower body is a circuit board 700 for controlling the operation of the blower. The circuit board 700 is preferably positioned near the housings 500, 600, e.g., above the location where the motor is mounted, to facilitate routing of the wires. During operation of the axial flow blower, air flow passes through the housings 500, 600 and carries away heat from the motor and fan. Most of the airflow does not flow out of the enclosure 500, 600 and thus does not provide sufficient heat dissipation for the circuit boards and electronic components outside the enclosure 500, 600. To this end, the circuit board 700 is equipped with a heat sink, and a vent 216 (shown in fig. 2) is formed on the main body case at a position adjacent to the circuit board. Due to the obstruction of the enclosures 500, 600, the heat dissipating airflow passing through the vent 216 does not interfere with the working airflow traveling along the longitudinal axis.

Fig. 10 shows a sectional view of the hair dryer in which the hood 220 and the first sound-absorbing member 400 are omitted. The blower body includes a second sound absorbing member 800 positioned between the air outlet side casing 600 and the distal end of the distal portion 211 of the blower body 200 and at least partially surrounding the cone-shaped baffle 610. The second sound-absorbing member 800 defines a segment of an air flow passage between the outlet-side shroud 600 and the blow pipe 300. The second sound-absorbing member is preferably cylindrical and dimensioned to avoid abrupt changes in the cross-section of the airflow passage. In this embodiment, the proximal inner diameter of the second sound-absorbing member 800 coincides with the distal inner diameter of the air-outlet-side cover 600, and the distal inner diameter of the second sound-absorbing member 800 coincides with the proximal inner diameter of the distal portion 301 of the blower pipe 300. The second sound-absorbing material 800 may have a porous structure such as sponge, foam, metal foam. The second sound-absorbing element may have a completely closed or a not completely closed profile.

Also shown in figure 10 are the positions of the motor 900 and fan 910 within the blower. The motor 900 may be a brushless motor having a diameter of 20-50mm, preferably 25-40mm, more preferably 30-35 mm. The fan 910 is provided in the intake side cover 500 to be rotated by the motor 900. The fan outer diameter is 50-100mm, preferably 70-90mm, more preferably 84-88 mm. The distance between the fan blade end and the inner wall of the intake side shroud 500 is 0.5 to 1.5mm, preferably 0.8 to 1 mm. Too small a distance may cause the blades to scratch the inner wall of the housing, and too large a distance may increase noise and reduce blowing efficiency.

Figure 10A shows a cross-sectional view of a blower according to another embodiment. The hair dryer includes a first sound absorbing member 400 ' located inside the hood and a second sound absorbing member 800 ' located downstream of the conical flow conductor 610 '. In this embodiment, the second sound-absorbing member 800 'is not comprised within the blower body, but is positioned in the proximal portion 302' of the blower pipe. This arrangement is advantageous in that it facilitates the replacement of the second sound-absorbing member, and allows the length of the second sound-absorbing member to be selected according to the length of the blow pipe.

Returning again to fig. 2, the blower body 200 further includes a handle 230, the handle 230 having a grip 231 for a user to grip and a connecting portion 232 for connecting the grip 231 to the body casing. The grip 231 is provided with control buttons 233, 234, so that the user can operate the blower with one hand. Preferably, the connecting portion 232 is pivotally connected to the proximal portion 213 of the main body housing, allowing the user to adjust the orientation of the handle 230 relative to the main body housing. The orientation of the handle 230 is locked after adjustment is complete using the locking mechanism 235.

The blower body 200 also includes a battery pack mounting mechanism 217 for attaching a removable battery pack (not shown). With the development of battery technology, the capacity of the battery pack is continuously increased, the weight of the battery pack is increased, and the weight of some high-capacity battery packs can reach more than 50% of the total weight of the hair dryer. As shown in fig. 10, the battery pack in the hair dryer, the motor 900, and the heat sink of the circuit board 700 are positioned in substantially the same area in the longitudinal direction, and the centers of gravity of these components are located substantially on the same straight line L. In fig. 2, the grip 231 of the handle 230 is shown above the battery pack mounting mechanism 217, and the straight line L where the center of gravity is located passes through the grip 231. Such an arrangement helps the user to stably maintain the orientation of the hair dryer during operation of holding the hair dryer in hand.

In another embodiment not shown in the figures, a battery pack mounting mechanism is provided on the attachment portion 232 of the handle 230. The advantage of this arrangement is that the battery pack is mounted directly on the handle 230, closer to the grip 231, and is more labor-efficient for the user to handle.

In order to enable the blower to blow up heavy leaves and small trash, the maximum air volume of the blower may be set to 430cfm or more, preferably 500cfm or more, and more preferably 550cfm or more. The running time under the maximum air flow is an important index for evaluating the performance of the hair dryer, and in order to ensure the running time of at least 9 minutes, proper battery capacity needs to be selected and the battery volume and the weight need to be considered. The efficiency of the blower can be measured by the ratio of the air volume to the input power at maximum air volume operation, which is preferably maintained above 0.6cfm/W for higher power blowers and above 0.9cfm/W for lower power blowers.

Specific parameter settings for both types of blowers are provided below. For the first type of hair dryer, the battery voltage is 40V, and the capacity can be selected from 2.6Ah, 3.0Ah, 4.0Ah, 5.0Ah and 6.0 Ah. The maximum air quantity of the blower is 550cfm, and the maximum input power is 850W. The continuous working time when the air compressor runs with the maximum air quantity is about 10 minutes, and the ratio of the air quantity to the input power is 0.65 cfm/W. The blower adopts a brushless motor, the diameter of the motor is 35mm, and the ratio of the blowing rate to the diameter of the motor is 15.1-15.7 cfm/mm. The fan outer diameter was 87.9mm, the angle of the fan blades 'windward airfoil surface relative to the longitudinal axis was about 29 degrees, and the fan blades' leeward airfoil surface relative to the longitudinal axis was about 51 degrees. The cross-sectional area of the air outlet of the air blowing pipe is 5269mm²The cross-sectional flow area of the position where the fan is located is 6182mm²The ratio between the two is 0.852. The included angle a between the straight line of the outer surface of the blowpipe and the longitudinal axis is 1 degree.

For the second type of blower, the battery voltage was 18V and the capacity was 72 Wh. The maximum air quantity of the blower is 430cfm, and the maximum input power is 438W. The continuous working time when the air conditioner operates at the maximum air quantity is about 9 minutes and 45 seconds, and the ratio of the air quantity to the input power is 0.98 cfm/W. The blower adopts a brushless motor, the diameter of the motor is 35mm, and the ratio of the blowing amount to the diameter of the motor is 12.3 cfm/mm. The fan outer diameter was 84.8mm, the angle of the fan blades 'windward airfoil surface relative to the longitudinal axis was about 44 degrees, and the fan blades' leeward airfoil surface relative to the longitudinal axis was about 64 degrees. The cross section area of the air outlet of the blowing pipe is 5183mm²The cross-sectional flow area of the fan is 5895mm²The ratio between the two is 0.879. The included angle a between the straight line of the outer surface of the blowpipe and the longitudinal axis is 0.4 degrees.

While the invention has been described in detail in connection with only a limited number of embodiments, it should be understood that the invention is not limited to such disclosed embodiments. Those skilled in the art can conceive of other embodiments, including variations, modifications, substitutions or equivalent arrangements of parts, which are within the spirit and scope of the invention.

Claims (26)

1. A hair dryer, comprising:

a blower body including a body casing accommodating therein a fan and a motor driving the fan to rotate, a rotation shaft of the fan defining a longitudinal axis,

a barrel removably attached to the blower body,

characterized in that a first sound absorbing member is provided in the blower main body, the first sound absorbing member includes a sound absorbing material and a mounting bracket for mounting the sound absorbing material, an airflow passage is defined in a hollow portion of the mounting bracket, and a sound absorbing opening is formed in the mounting bracket to allow an airflow passing through the airflow passage to contact the sound absorbing material.

2. The hair dryer of claim 1, wherein a plurality of first sound absorbing members are provided in said hair dryer body, each first sound absorbing member having a sound absorbing material and a mounting bracket, said plurality of first sound absorbing members being arranged at an air inlet of said hair dryer body.

3. The blower of claim 2, wherein the air inlet of the blower body includes a shield in which the plurality of first sound absorbing components are positioned.

4. The hair dryer of claim 3, wherein said mounting bracket has a polygonal cross-section and said sound absorbing aperture is formed in at least one face of said mounting bracket.

5. The hair dryer of claim 4, wherein said mounting bracket is hexagonal in cross-section and each face of said mounting bracket defines a plurality of sound absorbing apertures.

6. The hair dryer of claim 5, wherein the protective cover is configured as a honeycomb grid, each first sound absorbing member being aligned with one of the mesh cells in the honeycomb grid.

7. The hair dryer of claim 1, wherein said mounting frame includes a mounting frame defining said airflow passage and edge portions at opposite ends of said mounting frame, said edge portions extending radially from said mounting frame, said sound absorbing material being removably mounted on said mounting frame, said edge portions limiting movement of said sound absorbing material.

8. The hair dryer of claim 7, wherein said sound absorbing material has a cross section that matches a cross section of said mounting bracket, and said sound absorbing material has a non-fully closed profile to facilitate fitting to and removal from said mounting bracket.

9. The blower according to any one of claims 1 to 8, wherein a ratio between a cross-sectional area of the air flow passage and a cross-sectional area of a region surrounded by an outer edge of the sound-absorbing material is 0.5 to 0.7.

10. The hair dryer of any one of claims 1 to 8, wherein said sound absorbing material is selected from the group consisting of sponge, foam, metal foam.

11. The hair dryer of any one of claims 1 to 8, wherein said hair dryer body comprises an inlet side casing and an outlet side casing, both located inside said body casing and connected to each other.

12. The blower of claim 11, wherein the air inlet of the blower body includes a shield in which a plurality of first sound absorbing members are positioned, the shield being attached to the proximal end of the air inlet side casing, at least a portion of the plurality of first sound absorbing members extending into the proximal end of the air inlet side casing.

13. The blower of claim 11, wherein the inlet side casing has a first inner ring and a plurality of first vanes extending from the first inner ring, the outlet side casing has a second inner ring and a plurality of second vanes extending from the second inner ring, the motor is housed in the first inner ring and/or the second inner ring, and the plurality of first vanes and the plurality of second vanes are aligned along the longitudinal axis to form a plurality of guide vanes.

14. The hair dryer of claim 13, wherein at least one of said plurality of vanes is a hollow vane, and a chamber within said hollow vane communicates the space within said first and second inner rings with the space outside of said inlet and outlet side casings.

15. The blower of claim 13, wherein the distal edge of the at least one second vane is a non-flat surface.

16. The blower of claim 11, wherein the air outlet side casing includes a distally tapering conical flow conductor having a surface with a plurality of apertures formed therein and/or a tip of the conical flow conductor forming an aperture.

17. The hair dryer of claim 11, wherein a plurality of resilient positioning members are circumferentially spaced from one another on an outer surface of said air outlet side casing and/or said air inlet side casing to centrally position said air outlet side casing and/or said air inlet side casing within said main body casing.

18. The blower of claim 11, wherein the blower side housing includes a distal portion and a proximal portion with a gap of 1-2mm therebetween.

19. The blower of claim 16, wherein the blower body further includes a second sound absorbing member located between the distal end of the outlet side casing and the distal end of the body shell and at least partially surrounding the cone-shaped baffle.

20. The hair dryer of any one of claims 1 to 8, further comprising a second sound absorbing member located in the barrel.

21. The hair dryer of any one of claims 1 to 8, wherein a plane in which a distal edge of said barrel lies, as viewed from the side, is inclined at an angle of 5-30 degrees with respect to a plane perpendicular to said longitudinal axis.

22. The hair dryer of any one of claims 1 to 8, wherein a line on which an outer surface of the barrel lies, viewed from the side, is at an angle of 0.4-2 degrees with respect to the longitudinal axis.

23. The hair dryer of any one of claims 1 to 8, further comprising a handle connected to said main body casing and a circuit board disposed in said main body casing on a side thereof adjacent to said handle, said main body casing having a vent formed therein at a position adjacent to said circuit board.

24. The hair dryer of any one of claims 1 to 8, further comprising a handle connected to the main body housing and including a grip portion for a user to grip, and a battery pack removably mounted to the main body housing, a straight line connecting a center of gravity of the battery pack and a center of gravity of the motor passing through the grip portion, as viewed from a side.

25. The hair dryer of any one of claims 1 to 8, wherein a battery voltage of the hair dryer is 40V, a battery capacity is 2.6Ah-6.0Ah, a maximum air volume of the hair dryer is 500cfm or more, a maximum input power is 800W or more, a duration of operation when operating with the maximum air volume is 10 minutes or more, a diameter of the motor is 30-35mm, an outer diameter of the fan is 85-90mm, a ratio between a cross-sectional area at an air outlet of the blowpipe and a flow cross-sectional area at a position where the fan is located is 0.8-0.9, and an angle between a straight line on which an outer surface of the blowpipe is located and the longitudinal axis is 1-2 degrees.

26. The hair dryer of any one of claims 1 to 8, wherein a battery voltage of the hair dryer is 18V, a battery capacity is 2.0Ah-6.0Ah, a maximum air volume of the hair dryer is 400cfm or more, a maximum input power is 400W or more, a duration of operation when operating with the maximum air volume is 9 minutes or more, a diameter of the motor is 30-35mm, an outer diameter of the fan is 80-85mm, a ratio between a cross-sectional area at an air outlet of the blowpipe and a flow cross-sectional area at a position where the fan is located is 0.85-0.9, and an angle between a straight line on which an outer surface of the blowpipe is located and the longitudinal axis is 0.4-1 degree.

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