CN215820724U - Hand drier - Google Patents

Abstract

The utility model discloses a hand dryer. The hand dryer comprises a shell, wherein the shell is provided with an air outlet, an air channel leading to the air outlet is formed in the shell, a motor and fan blades driven by the motor are also accommodated in the shell, at least two circuit boards which are separately arranged are also accommodated in the shell, and at least one circuit board is electrically connected with the motor. The hand dryer is smaller in volume than the prior art.

Description

Hand drier

[ technical field ] A method for producing a semiconductor device

The utility model relates to an electric appliance, in particular to a hand dryer.

[ background of the utility model ]

Hand dryers generally mainly include a heating type and a high-speed air drying type. These two types of hand dryers have respective features. The heating type hand dryer usually has a relatively large heating power of over 1000W, and a motor power of less than 200W. The hand dryer is typically characterized by high wind temperature, and water on the hands is carried away by the wind at a relatively high temperature, which is slow, generally more than 30 seconds.

The high-speed air type hand dryer is characterized in that the air speed is very high and can reach more than 130 m/s, the hand drying speed is about 10 s, the heating power is low and is only hundreds of watts, the heating function is only to keep the comfort level, and the hand drying speed is not influenced basically. The wall-mounted type wall-mounted type wall type.

Install the motor in the casing of hand dryer, fan and the circuit board that is equipped with each electrical components, the wind that lets the fan through the rotation of motor gets into the wind channel, flow through the wind channel in order to let the wind that the fan formed, concentrate all circuit components in a circuit board in current hand dryer, the volume of circuit board is great, occupy the inside great space of hand dryer, and because the characteristic of circuit board shape, the unable make full use of in circuit board peripheral space, cause the space extravagant, also make the volume of hand dryer great, the hand dryer will occupy great placement space yet.

Accordingly, there is a need for improvements in the art that overcome the deficiencies in the prior art.

[ Utility model ] content

The object of the present invention is to provide a hand dryer which is small in volume.

The purpose of the utility model is realized by the following technical scheme:

the embodiment of the utility model provides a hand dryer which is provided with a shell, wherein the shell is provided with an air outlet, an air duct leading to the air outlet is formed in the shell, a motor and fan blades driven by the motor are also accommodated in the shell, at least two circuit boards which are separately arranged are also accommodated in the shell, and at least one circuit board is electrically connected to the motor.

In one embodiment, at least one of the circuit boards is disposed within the air duct above the air outlet or below the air outlet.

In one embodiment, at least one of the circuit boards is arranged inside the air outlet obliquely with respect to a plane perpendicular to an axial direction of the air duct.

In one embodiment, at least one circuit board arranged in the air duct is arranged to divide the air duct into at least two sub-air ducts, wherein each sub-air duct extends along the extending direction of the air duct and is communicated with the air outlet.

In one embodiment, the circuit board dividing the air duct into at least two sub-air ducts extends axially along the air duct.

In one embodiment, the central axis of the output shaft of the motor and the circuit board extending axially along the air duct are located on the same plane.

In one embodiment, at least one of the circuit boards is disposed opposite to the circuit board dividing the air duct into at least two sub-air ducts, and two adjacent circuit boards are spaced apart from each other.

In one embodiment, the minimum distance between two adjacent circuit boards is in a range of 3.6mm to 4.2 mm.

In an embodiment, at least one of the circuit boards forms a predetermined included angle with a circuit board dividing the air duct into at least two sub-air ducts.

In an embodiment, each of the circuit boards is uniformly disposed in the air duct and above the air outlet or below the air outlet.

In an embodiment, each of the circuit boards is attached to a sidewall of the air duct, and the air duct is formed between the circuit boards.

In an embodiment, each of the circuit boards is obliquely arranged inside the air outlet with respect to a plane perpendicular to an axial direction of the air duct.

In an embodiment, at least one of the circuit boards is provided with a power element, and the power element is arranged on one side of the circuit board facing the air duct.

In one embodiment, at least one of the circuit boards is disposed above another of the circuit boards.

In one embodiment, at least one of the circuit boards is a power board, and at least another one of the circuit boards is a main control board;

the power panel is electrically connected with the motor, and the main control panel is electrically connected with the motor.

In one embodiment, the main control panel is obliquely arranged at the inner side of the air outlet relative to a plane perpendicular to the axial direction of the air duct.

In an embodiment, a distance between the power board and the main control board gradually increases toward the air outlet.

In one embodiment, the main control board comprises at least two sub circuit boards spaced apart from each other.

In one embodiment, the two sub circuit boards are parallel to each other.

In one embodiment, the main control board is circular, and the power board is rectangular.

In an embodiment, the main control board, the power board, the motor, and the fan blades are arranged from top to bottom.

In one embodiment, the housing includes an upper housing and a lower housing, wherein the motor and the fan blades are housed in the lower housing and at least one of the circuit boards is housed in the upper housing.

In one embodiment, the air duct is disposed within the upper housing; the upper housing is in fluid communication with the lower housing; and the lower shell is provided with an air inlet communicated with the air duct.

In an embodiment, the housing further includes at least one side branch housing, and the side branch housing is provided with an exhaust hole communicated with the air outlet, and the side branch housing and the housing are arranged at a preset angle.

In one embodiment, the hand dryer is a stand-alone device.

Compared with the prior art, the utility model has the following beneficial effects: due to the fact that the at least two circuit boards are arranged, electrical components can be separately arranged on different circuit boards, the size of one circuit board is reduced relative to the size of the circuit board in the original hand dryer, the circuit boards can be arranged and arranged in the shell according to the shape of the hand dryer, space in the shell is reasonably used, space waste is reduced, the size of the hand dryer can be reduced, and the hand dryer is more miniaturized and cost is reduced. When in use, the hand dryer can reduce the placing space and is convenient to use.

[ description of the drawings ]

Fig. 1 is a perspective view of a hand dryer according to an embodiment of the present invention.

Fig. 2 is a schematic view of the internal structure of the hand dryer according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view a-a of fig. 1.

Figure 4 is a schematic view of a first arrangement of two circuit boards of the hand dryer of the present invention.

Fig. 5 is a second layout diagram of two circuit boards of the hand dryer according to an embodiment of the present invention.

Fig. 6 is a third layout diagram of two circuit boards of the hand dryer according to an embodiment of the present invention.

Fig. 7 is a fourth layout diagram of two circuit boards of the hand dryer in accordance with one embodiment of the present invention.

Fig. 8 is a schematic diagram of a fifth arrangement of two circuit boards of the hand dryer in accordance with an embodiment of the present invention.

Figure 9 is a circuit block diagram of a hand dryer in accordance with one embodiment of the present invention.

Wherein, 100, hand dryer; 1. a housing; 11. an upper housing; 12. a lower housing; 110. an air outlet; 13. a side branch housing; 131. an air outlet; 141. an air outlet; 14. a side branch housing; 3. a motor; 4. a fan blade; 2. an air duct; 21. a sub-duct; 22. a sub-duct; 5. a circuit board; 6. a circuit board; 61. a power element; 7. a receiving base; 121. an air inlet; 120. an air inlet channel.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising", will be understood to have an open, inclusive meaning, i.e. to be construed as "including, but not limited to", unless the context requires otherwise.

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for purposes of clarity of explanation, numerous directional terms are used in order to describe the structure and operation of the present invention, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "up", "down", etc. should be construed as words of convenience and not as words of limitation.

Embodiments of the present invention are described below with reference to the drawings. As shown in fig. 1 and 2, the hand dryer 100 has a housing 1. The housing 1 includes a housing having an upper housing 11, a lower housing 12, and a side branch housing 13 and a side branch housing 14 connected to the upper housing 11, and the upper housing 11 is located above the lower housing 12. The upper case 11 and the lower case 12 have a cylindrical structure having a hollow space. It can be understood that the housing 1 may not be limited to the structure of splicing the upper housing and the lower housing, but may also be formed by splicing the left and right portions, or an integrally formed housing, and a partition layer is disposed inside the housing to separate the interior of the housing into two accommodating cavities.

In the present embodiment, the case 1 including the upper case 11 and the lower case 12 is specifically described as an example. The upper and lower housings 11, 12 are generally cylindrical in shape, it being understood that they may be other shapes. Each housing may be made of plastic, a combination of plastic and metal, or any suitable material. The two side support housings are respectively located at two sides of the upper housing 11 and are arranged at a preset angle, and the angle between the two side support housings may be 180 °, 160 °, 150 °, or the like. Air outlets 131 and 141 are respectively formed on the side branch housing 13 and the side branch housing 14, and air outlet channels are respectively arranged in the side branch housing 13 and the side branch housing 14. The air outlet is communicated with the corresponding air outlet channel. Thus, the wind can flow through the wind outlet channel and be blown out from the wind outlet.

The upper shell 11 and the lower shell 12 are in fluid communication with each other and are fixed to each other by tapping screws, and a seal ring is provided at a butt joint of the upper shell 11 and the lower shell 12. In another embodiment, the upper housing 11 and the lower housing 12 may be fixedly connected to each other by a screw-type connection or a snap-type connection. An air outlet 110 penetrating through the upper shell 11 is arranged on the side wall of the upper shell, and the air outlet 110 is communicated with the air duct 2. The outlet 110 is located at an upper portion of a sidewall of the upper case 11. The outlet 110 is a long opening. An air duct 2 is formed in the upper housing 11 to be in fluid communication with the air outlet 110. The air duct 2 extends from bottom to top to the air outlet 110. The wind generated by the fan blades 4 can flow to the air outlet 110 through the wind channel 2 and be blown out from the air outlet.

The motor 3 and the fan blades 4 driven by the motor 3 are housed in the lower case 12, and the motor 3 and the fan blades 4 are housed in the upper case 11. An air inlet 121 is formed at the bottom of the lower shell 12, an air inlet channel 120 is formed in the lower shell 12, and the air inlet 121 is communicated with the air inlet channel 120. The motor 3 drives the blades of the fan blades 4 to rotate, so that the air enters the air inlet channel 120 from the air inlet 121, forms high-speed airflow flowing into the air duct 2, flows into the air outlet channels of the side branch shells from the air outlet 110, and finally is exhausted through the air outlets on the two side branch shells. It is understood that only one side branch housing may be provided, or three side branch housings may be provided. In another embodiment, a side branch casing may be connected to the upper casing 11, and other air outlet casings may be extended to different directions on the side branch casing according to the requirement of the air outlet direction. The remaining hand dryer configurations of the various configurations are not described in detail herein.

As shown in fig. 1, 2, and 3, the circuit board 5 is disposed inside the air duct 2 below the air outlet 110, and the circuit board 6 is disposed inside the air outlet 110. The circuit board 5 divides the wind tunnel 2 into a sub-wind tunnel 21 and a sub-wind tunnel 22. Both the two sub-air ducts extend along the extending direction of the air duct 2 and are communicated with the air outlet 110. The circuit board 5 may extend obliquely to the axis of the wind tunnel 2 within the wind tunnel 2, or may extend parallel to the axis of the wind tunnel 2. Thereby, the circuit board 5 does not occupy other space in the shell 1, and the space is saved. Thus, the hand dryer can be miniaturized. Further, the circuit board 5 is directly arranged in the air duct 2, so that heat dissipation of various elements of the circuit board 5 is facilitated. In addition, the circuit board 5 also serves as a splitter plate in the air duct 2 to split the air flow to form two upward air flows respectively passing through the sub-air duct 21 and the sub-air duct 22, thereby eliminating the air flow rotation and reducing the noise. It will be appreciated that a plurality of circuit boards may be provided in the air duct 2. It will be appreciated that the circuit board 5 may also be arranged against a side wall of the air duct 2.

According to the hand dryer, the circuit board and the motor are separately arranged, the circuit board and the motor can be more reasonably arranged in the shell, the space in the shell is reasonably utilized, the space waste is reduced, the size of the hand dryer can be reduced, and the hand dryer is more miniaturized and the cost is reduced. When in use, the hand dryer can reduce the placing space and is convenient to use. And each circuit board is kept away from the air inlet channel 120, so that the air inlet area of the air inlet channel 120 cannot be interfered, the wind resistance is reduced, the noise is reduced, and the air inlet efficiency is also improved.

Optionally, as shown in fig. 2 and fig. 3, the circuit board 5 extends axially along the air duct 2, and at this time, the circuit board 5 is parallel to the axis of the air duct 2, so that the air flows flowing through the two sub-air ducts can both smoothly flow into the corresponding air outlet channel from the air outlet 110. Further, the central axis of the output shaft of the motor 3 and the circuit board 5 extending axially along the air duct 2 in the air duct 2 may be located on the same plane, so as to better divide the air flow into two flows uniformly. The air duct 2 can be cylindrical, so that the circuit board 5 can be better placed, and the air flow can flow more smoothly. Of course, the air duct 2 may have other shapes such as a rectangular parallelepiped shape or a spherical shape.

Preferably, as shown in fig. 2 and 3, the central axis of the output shaft of the motor 3 is also coaxial with the axis of the air chute 2. The plane of the circuit board 5 divides the air outlet 110 into two parts, and the two parts of the air outlet 110 are respectively communicated with the two sub-air ducts and have the same size. That is, the circuit board 5 uniformly divides the air duct 2 into two parts. In this case, the airflow can be made more uniform from both sides of the hand dryer. The balance of the two sides of the whole hand dryer is better, and the hand dryer is more favorable for stable placement.

In some embodiments, the central axis of the output shaft of the motor 3 may be offset from the circuit board 5 extending axially along the air duct 2.

Further, as shown in fig. 2 and 3, a circuit board 6 and a circuit board 5 which are separately provided are also disposed in the housing 1 and have different functions. The circuit board 6 and the circuit board 5 are both disposed in the housing 1, and the circuit board 6 is disposed above the circuit board 5 and located inside the air outlet 110. Thus, the air flow flowing out of the air duct 2 can be guided to the air outlet 110 by the circuit board 6. More specifically, the circuit board 6 is arranged inside the outlet 110 obliquely with respect to a plane perpendicular to the axial direction of the air duct 2. Preferably, the distance between the two circuit boards gradually increases toward the air outlet 110, i.e., the circuit board 6 inclines upward toward one side of the air outlet 110.

Because the circuit board 6 is provided with a plurality of circuit elements or the circuit board 6 is arranged in different directions, the distances from each point on the circuit board 6 to the circuit board 5 can be at least partially different. In the present embodiment, as shown in fig. 4, the minimum distance h between the circuit board 5 and the circuit board 6 ranges from 3.6mm to 4.2mm, such as 3.8mm, 3.9mm, or 4.0 mm. And the longitudinal distance between the upper end edge of the circuit board 6 and the top of the inner cavity of the shell is M, then h is more than or equal to 3.8mm and less than or equal to (M-3.5mm), wherein 3.8mm is the minimum distance between the circuit board 5 and the circuit board 6, and 3.5mm of the upper end of the circuit board 6 is the reserved minimum safe creepage gap. The minimum distance between the circuit boards 5 and 6 which are separated from each other can keep the safe distance between the two circuit boards, prevent the energy loss caused by the mixing of the originally divided air flows, and meet the requirement of miniaturization.

As shown in fig. 2 and 3, the circuit board 6 has a circular shape and the circuit board 5 has a rectangular shape. The inner wall of the upper shell 11 is provided with a hook, and the circuit board is provided with a clamping position hooked by the hook, so that the circuit board is fixed with the upper shell 11. In another embodiment, the two circuit boards may be locked to the upper housing 11 by bolts. Through the setting of circular circuit board, avoided the air current right angle to turn to, less flow loss.

Alternatively, as shown in fig. 2, 3 and 9, the circuit board 6 is a main control board, and the circuit board 5 is a power supply board. The power panel is electrically connected with the motor 3 and the main control panel to supply power to the main control panel and the power panel, the main control panel is electrically connected with the motor 3, so that the power supply supplies power to the main control panel and the motor 3 through the power panel respectively, and the main control panel can control the working state of the motor, such as heat, wind speed, working time and the like. The motor is controlled through the main control board, and the motor with higher power can be matched, so that the air outlet speed is improved. In addition, the power panel is provided with a capacitor with a larger volume, occupies more space, and can be arranged in the air duct 2 to ensure that the space in the shell 1 is more reasonably planned. Meanwhile, the power panel generates heat more highly, and is placed in the air duct 2, so that heat dissipation of the power panel is facilitated.

It will be appreciated that the circuit boards 6 and 5 may also be other types of circuit boards, at least one of which controls the motor 3. Or there may be other circuit boards to control the motor 3 besides the circuit board 6 and the circuit board 5, and it is not limited to detect the motor 3 only by the main control board.

The main control board (i.e. the circuit board 6) is provided with a plurality of circuit elements on a side facing the power supply board (i.e. the circuit board 5), wherein at least part of the circuit elements are power elements 61, such as IGBTs (or high voltage MOS), driving chips and MCUs. The power components are disposed on a side of the main control board (i.e., the circuit board 6) facing the power board (i.e., the circuit board 5) and at an end close to the air outlet 110, so that the airflow flowing out of the air duct 2 can be blown to the power components 61, and the power components 61 can be more effectively cooled. At this time, in the housing 1, the main control board (i.e., the circuit board 6), the power board (i.e., the circuit board 5), the motor 3, and the fan blades 4 are arranged from top to bottom. The airflow formed by the fan blades 4 flows through the power supply board (i.e. the circuit board 5) and the main control board (i.e. the circuit board 6) from bottom to top in sequence to dissipate heat of the power supply board and the main control board. It can be understood that, other circuit boards may also have power elements, and the power elements are disposed on a side of the circuit board facing the air duct 2, so that the airflow in the air duct 2 can flow through the power elements to dissipate heat of the power elements.

The main control board (i.e., the circuit board 6) includes at least two sub-circuit boards spaced apart from each other. The two sub circuit boards are parallel to each other, one is above, the other is below, the two sub circuit boards are spaced from each other, and an adhesive tape or an insulating rubber pad can be arranged between the two sub circuit boards.

It is understood that the circuit board 5 may be a main control board, and the circuit board 6 may be a power supply board. The main control board and the power panel can be arranged according to actual requirements.

In addition, in the hand dryer, in addition to the circuit board 5 and the circuit board 6, other circuit boards may be disposed as required for use, and placed in the upper case 11 or the lower case 12.

Further, a circuit board may be disposed between the side surface of the motor 3 and the housing in a portion of the area. The circuit board placed on the side surface of the motor 3 can be used for controlling the motor 3 and also can be used for connecting a power supply or other functional circuit boards. At the moment, the volume of the lower shell area of the hand dryer is increased, but the volume of the upper shell area can be reduced, so that the hand dryer has different volumes, and is suitable for different environments.

Further, each circuit board is spaced apart from the motor 3. It will be appreciated that the circuit board 5 may also be proximate to the motor 6.

It will be appreciated that, in addition to being disposed inside the air duct 2 and the air outlet 110, the circuit board may be disposed at other locations according to a reasonable spatial layout, which also makes the interior of the hand dryer more compact, as will be further described below. Further, in order to allow the drying device to be placed directly on the table top, a receiving base 7 is connected to the bottom of the lower housing 12, allowing the hand dryer to be a stand-alone device. Therefore, the hand dryer can be moved to a proper position at any time according to use requirements, the hand dryer is convenient to clean, and the area where the hand dryer is placed is also convenient to clean.

In addition, in the hand dryer, the fan blades 4, the motor 3, the circuit board 5 and the circuit board 6 can also be arranged from top to bottom in sequence, at the moment, the air duct 2 is arranged below the fan blades 4, the air outlet 110 is positioned below the air duct 2, and the circuit board 5 is positioned above the air outlet. The side shell with the air outlet channel is connected with the air outlet 110 and is also positioned below the air duct 2.

Figures 5 to 8 show a number of different layouts of the circuit board of the hand dryer of the present invention. In the layout shown in fig. 5-7, the circuit boards 5 and 6 are all disposed in the air duct 2, and at this time, 2 circuit boards are all located below the air outlet 110.

As shown in fig. 5, the circuit board 5 divides the air duct 2 into a sub-air duct 21 and a sub-air duct 22, the circuit board 6 and the circuit board 5 are disposed opposite to each other, and an air duct shaft passes through between the circuit board 5 and the circuit board 6, so that the circuit board 5 and the circuit board 6 do not interfere with each other, and air flow on one side of the circuit board 5 and one side of the circuit board 6 can also pass through normally. It will be appreciated that the circuit boards 5 and 6 may be offset to one side of the duct axis rather than being in the middle of the duct 2. Of course, two adjacent circuit boards can be separated by foam.

In addition, the circuit board 5 and the circuit board 6 can also be obliquely arranged in the air duct 2 and form a certain angle with the air duct axis. The air flow can flow from the side of the circuit board 6 facing away from the circuit board to the air outlet 110, from the side of the circuit board 5 facing away from the circuit board 6 to the air outlet 110, or from between the circuit board 5 and the circuit board 6.

Alternatively, as shown in fig. 6, the planes of the circuit boards 5 and 6 may be arranged in a crossing manner, and the circuit boards 5 and 6 form a predetermined angle therebetween, which is different from 30 °, 70 °, or 90 °.

Or, as shown in fig. 7, the circuit board 5 and the circuit board 6 are disposed opposite to each other and are both attached to the side wall of the air duct 2, and the air duct 2 is formed between the circuit board 5 and the circuit board 6. It is understood that the circuit boards 5 and 6 may be adjacent to each other and attached along the side wall of the air duct 2.

It will be appreciated that the number of circuit boards may be more than 2, 3, 4, and arranged in different arrangements in the air duct 2. The number of the circuit boards can also be 1, and the circuit boards are arranged in the air duct 2 and can also be arranged at other positions in the shell 1.

When the air duct 2 is located above the air outlet 110, all the circuit boards are also located above the air outlet, and the circuit boards can be arranged according to the actual shape of the drying setting.

Figure 8 shows another circuit board layout of the hand dryer of the present invention. As shown in fig. 8, in the hand dryer, the circuit boards 5 and 6 are both arranged inside the air outlet 110 obliquely with respect to a plane perpendicular to the axial direction of the air duct, and the circuit boards 5 and 6 may be parallel to each other or non-parallel. The air duct is internally provided with no circuit board, and air flow can smoothly pass through the air duct. It can be understood that there are more than 2 circuit boards, 3 circuit boards and 4 circuit boards, and the circuit boards are all disposed inside the air outlet 110.

According to the embodiment, when at least two circuit boards are arranged, the electrical components can be separately arranged on different circuit boards, the size of one circuit board is reduced relative to that of the circuit board in the original hand dryer, and the circuit boards can be arranged and arranged in the shell according to the shape of the hand dryer, so that the space in the shell is reasonably used, the space waste is reduced, the size of the hand dryer can be reduced, and the hand dryer is more miniaturized and the cost is reduced. When in use, the hand dryer can reduce the placing space and is convenient to use.

Further, the hand dryer may be provided with a battery pack which supplies power to the motor and the circuit boards. Of course, the hand dryer may also be powered by an external power source.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

Claims (25)

1. A hand dryer is provided with a shell, the shell is provided with an air outlet, an air duct leading to the air outlet is formed in the shell, a motor and fan blades driven by the motor are contained in the shell, and the hand dryer is characterized in that at least two circuit boards which are separately arranged are contained in the shell, and at least one circuit board is electrically connected to the motor.

2. The hand dryer of claim 1, wherein at least one of the circuit boards is disposed within the air duct above the air outlet or below the air outlet.

3. Hand dryer according to claim 2, characterized in that at least one of the circuit boards is arranged inside the air outlet obliquely with respect to a plane perpendicular to the axial direction of the air duct.

4. Hand dryer according to claim 2, characterized in that at least one of the circuit boards arranged within the air duct is arranged to divide the air duct into at least two sub-air ducts, wherein each of the sub-air ducts extends in the extension direction of the air duct and communicates with the air outlet.

5. Hand dryer according to claim 4, characterized in that the circuit board dividing the air duct into at least two sub-ducts extends axially along the air duct.

6. Hand dryer according to claim 5, characterized in that the centre axis of the output shaft of the motor is located in the same plane as the circuit board extending axially along the air duct.

7. The hand dryer of claim 4, wherein at least one of the circuit boards is disposed opposite a circuit board dividing the air duct into at least two sub-air ducts, and two adjacent circuit boards are spaced apart from each other.

8. The hand dryer of claim 7, wherein the minimum distance between two adjacent circuit boards is in the range of 3.6mm to 4.2 mm.

9. The hand dryer of claim 4, wherein at least one of the circuit boards forms a predetermined angle with a circuit board dividing the air duct into at least two sub-air ducts.

10. The hand dryer of claim 2, wherein each circuit board is disposed within the air duct above or below the air outlet.

11. The hand dryer of claim 1, wherein each circuit board is attached to a side wall of the air duct, and the air duct is formed between the circuit boards.

12. Hand dryer according to claim 1, characterized in that each circuit board is arranged obliquely to the plane perpendicular to the axial direction of the air duct inside the air outlet opening.

13. The hand dryer according to claim 1, wherein at least one of the circuit boards is provided with a power element, and the power element is arranged on a side of the circuit board facing the air duct.

14. A hand dryer according to claim 1 wherein at least one of the circuit boards is arranged above another of the circuit boards.

15. A hand dryer according to claim 14 wherein at least one of said circuit boards is a power supply board and at least another of said circuit boards is a main control board;

the power panel is electrically connected with the motor, and the main control panel is electrically connected with the motor.

16. Hand dryer according to claim 15, characterized in that the main control panel is arranged obliquely inside the air outlet with respect to a plane perpendicular to the axial direction of the air duct.

17. The hand dryer of claim 16, wherein the distance between the power supply board and the main control board gradually increases toward the air outlet.

18. A hand dryer according to claim 17 wherein the main control board comprises at least two sub-circuit boards spaced apart from one another.

19. A hand dryer according to claim 18 wherein the two sub-circuit boards are parallel to each other.

20. The hand dryer of claim 15, wherein the main control panel is circular and the power panel is rectangular.

21. The hand dryer of claim 15, wherein the main control board, the power board, the motor, and the fan blades are arranged from top to bottom.

22. A hand dryer according to claim 1 wherein the housing comprises an upper housing and a lower housing, wherein the motor and the fan blades are housed in the lower housing and at least one of the circuit boards is housed in the upper housing.

23. The hand dryer of claim 22, wherein the air duct is disposed within the upper housing; the upper housing is in fluid communication with the lower housing; and the lower shell is provided with an air inlet communicated with the air duct.

24. The hand dryer as claimed in claim 1, wherein the housing further comprises at least one side branch housing, and the side branch housing is provided with an exhaust hole communicated with the air outlet, and the side branch housing and the housing are arranged at a predetermined angle.

25. A hand dryer according to claim 1 wherein the hand dryer is a stand-alone device.

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