JPH08196470A - Hand dryer - Google Patents

Abstract

PURPOSE: To provide a hand dryer capable of eliminating cold wind feeling by warming a high speed air flow if necessary. CONSTITUTION: On this hand dryer so constructed as that a high pressure air flow from a high pressure air generator 3 is jetted through nozzles 18 and 19 as a higher speed acting air flow to blow off moisture on a hand to dry the hand, a feedback flow path 20 is installed to feed back a part of a high pressure air flow generated at the high pressure air generator 3, and, on a part of the feedback flow path 20, an opening and closing means 1 to open and to close the feedback flow path 20 is installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand dryer for wiping a wet hand after washing with kinetic energy of a high-speed air stream.

[0002]

2. Description of the Related Art In order to maintain a hand in a hygienic state, it is necessary to wash the hand and also to perform a drying treatment after the washing in a hygienic manner. Therefore, the wet hand is directly dried by washing or the like. For example, a hand dryer as disclosed in JP-A-2-23918 is used.

The conventional hand dryer shown in the above publication is constructed by providing a heating means by an electric heater to a blowing means rotated by an induction motor. The air blower forms an air flow blown to the hand dryer by the rotation of the sirocco type blades, and the electric heater heats the air flow formed by the blower to use the air flow blown to the hand dryer as hot air.

In the hand dryer having the above structure, the hand can be dried hygienically by holding the wet hand over the hand dryer where hot air is blowing. That is, the water content of the hand hit by the hot air is evaporated by the heat, blown off by the wind and removed from the hand without wiping with a woven cloth or the like.

In such a hand dryer, since the moisture is evaporated by heat energy, it takes a long time for the drying process, which is troublesome to use. Therefore,
A hand dryer as disclosed in Japanese Patent Laid-Open No. 5-293055 has been developed in which the water content of a hand is blown away by the kinetic energy of a high-speed air stream to dry the hand. This type of hand dryer has a turbo fan 101 as shown in FIG.
The high-speed airflow generated by the above is blown out toward the hand from the nozzle 102, and the moisture of the hand is blown away. Since heat energy is not used for drying the hand, a quicker drying process than the type described above is possible. And the usability is excellent. In particular, in the one disclosed in Japanese Patent Laid-Open No. 5-293055, it is devised to raise the temperature of the blown air by causing the blower air to be sucked into the turbofan 101 and circulated.

[0006]

Among the conventional hand dryers described above, a hand dryer that dries a hand with a high-speed air flow without relying on heat energy has some advantages as described above, but it is wet. The so-called sensible temperature of the hand during processing is fairly low because the high-speed wind is applied directly to the hand. This cannot be easily solved even if the air is circulated in the turbofan. That is, the air blown from the nozzle and blows off the moisture in the hand loses heat by the moisture in the hand, and when it is sucked into the turbo fan again, the temperature is almost the original temperature and the temperature rises due to circulation. You can hardly expect a warming effect, and even the water that was blown away by the drying process will be absorbed. Therefore, in the winter, especially in the severe winter, aside from the summer, a feeling of cold wind is felt in the hand, which is difficult for the user.

Although there is a familiar method for eliminating the cooling sensation due to a high-speed air flow, for example, an electric heater is incorporated, but an apparatus of this kind which is originally characterized by performing a drying process without relying on heat energy is provided. However, such a method of adding the heating means is not suitable because it may reduce the original characteristics of the apparatus, and also increases power consumption, which is not a good idea.

The present invention has been made in order to solve the above-mentioned problems, and the problem is to provide a hand dryer capable of warming a high-speed air stream as necessary to eliminate the feeling of cold air. That is, it is possible to adjust the degree of warming of blown air, and to improve the operability of the device.

[0009]

In order to achieve the above object, the invention of claim 1 is that a high pressure air flow generated by a high pressure air flow generator is ejected as a high-speed working air flow by a nozzle,
A feedback flow path for feeding back a part of the high-pressure airflow generated by the high-pressure airflow generator to the high-pressure airflow generator with respect to a hand dryer that blows away moisture from the hand with the kinetic energy of the working airflow to dry the hand. A means for providing the opening and closing means for opening and closing the feedback channel is provided in a part of the feedback channel.

In order to achieve the above-mentioned object, the invention of claim 2 blows out a high-pressure air flow by a high-pressure air flow generator as a high-speed working air flow by a nozzle, and blows off moisture of the hand by the kinetic energy of the working air flow. A feedback flow path for feeding back a part of the high-pressure air flow generated by the high-pressure air flow generator to the hand dryer for drying the high-pressure air flow generation device is provided, and the high-pressure air flow generation device of the feedback flow path is provided. A means for rotatably providing, on the suction side opening, an adjusting plate having an adjusting diaphragm opening for adjusting the opening area of the opening between zero and full opening.

In order to achieve the above-mentioned object, the invention of claim 3 causes a high-pressure air flow generated by a high-pressure air flow generator to be ejected as a high-speed working air flow by a nozzle, and the kinetic energy of the working air flow blows away water from the hand. A feedback flow path for feeding back a part of the high pressure air flow generated by the high pressure air flow generator to the hand dryer for drying the high pressure air flow generator is provided, and the high pressure air flow generation device of the feedback flow path is provided. A means for slidably installing an adjusting plate having an adjusting aperture opening for adjusting the opening area of the opening portion between zero and full opening is adopted in the opening portion on the suction side.

In order to achieve the above object, the invention of claim 4 employs means for enabling the adjusting plate in the means according to either claim 2 or claim 3 to be operated from the outside of the apparatus.

[0013]

In the means according to the first aspect, the air sucked into the high-pressure air flow generator is heated in the high-pressure air flow generator while being heated and blown out when the opening / closing means is closed. The blown high-pressure air flow is guided to the nozzle and becomes the working air flow for drying the hand. In the state in which the opening / closing means is opened, the air sucked into the high-pressure air flow generator is heated in the high-pressure air flow generator as the temperature rises and is blown out. The main air flow of the high pressure air flow blown out is guided to the nozzle and becomes the working air flow for drying the hands,
A part is fed back to the high-pressure airflow generator as a feedback component. This feedback component mixes with the main airflow in addition to the above-mentioned heating in the high-pressure airflow generation device, is mixed with the main airflow, and is ejected from the nozzle as an operating airflow, and part of it becomes a feedback component.

According to the second aspect of the present invention, in the state where the feedback passage is fully closed by the adjusting plate, the air sucked into the high-pressure air flow generator is heated in the high-pressure air flow generator as the pressure is increased and blown out. To be done. The blown high-pressure air flow is guided to the nozzle and becomes the working air flow for drying the hand. When the feedback flow path is opened by the adjusting plate, the air sucked into the high-pressure airflow generator is heated in the high-pressure airflow generator as the temperature rises and is blown out. The main air flow of the blown high-pressure air flow is guided to the nozzle and becomes an operating air flow for drying the hand, and part of it is fed back to the high-pressure air flow generator as a feedback component. This feedback component is heated in the high-pressure airflow generator in addition to being heated in the second stage, mixed with the main airflow, and ejected as a working airflow from the nozzle, and part of it becomes the feedback component. The temperature of the main airflow can be adjusted by adjusting the opening degree by rotating the aperture opening of the adjusting plate.

In the means according to claim 3, the air sucked into the high-pressure air flow generator is heated in the high-pressure air flow generator as the pressure is increased and blown out when the feedback passage is fully closed by the adjusting plate. To be done. The blown high-pressure air flow is guided to the nozzle and becomes the working air flow for drying the hand. When the feedback flow path is opened by the adjusting plate, the air sucked into the high-pressure airflow generator is heated in the high-pressure airflow generator as the temperature rises and is blown out. The main air flow of the blown high-pressure air flow is guided to the nozzle and becomes an operating air flow for drying the hand, and part of it is fed back to the high-pressure air flow generator as a feedback component. This feedback component is heated in the high-pressure airflow generator in addition to being heated in the second stage, mixed with the main airflow, and ejected as a working airflow from the nozzle, and part of it becomes the feedback component. The temperature of the main airflow can be adjusted by adjusting the opening degree by sliding the diaphragm opening of the adjusting plate.

In the means according to the fourth aspect, the temperature of the working air flow blown out from the nozzle can be adjusted by an operation from the outside of the apparatus, in addition to the action according to the second or third aspect.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. Example 1. 1 to 4 show this embodiment,
As shown in FIG. 1 as a whole, the hand dryer according to the first embodiment incorporates a high-pressure airflow generator 3 in a box 2 forming an outer shell having a hand insertion part 1 as a processing part at the front upper part. The high-pressure air generated by the high-pressure airflow generator 3 is supplied to the hand insertion part 1 to form a working air flow having sufficient kinetic energy to blow off water in the hand insertion part 1. It is installed on the floor of a room or on the wall surface.

The front of the box 2 forming the outer shell of the hand dryer is composed of a front panel and an insertion panel forming the manual insertion section 1, and the back is composed of a back plate. Both side surfaces of the box body 2 are composed of left and right side plates, an upper surface thereof is an upper panel, and a bottom portion thereof is composed of a gate-shaped frame 4.

Hand insertion part 1 formed by insertion part panel
Is open on the front side and both side sides at the upper front of the box 2.
It is configured as a slanted U-shaped recess that tilts downward toward the back side, and you can freely remove and insert your hands in a visible state without feeling discomfort or anxiety when both hands are naturally aligned and extended. Has a height and a depth, and a drain port is formed near the side of the bottom on the back side. The inner part of the hand insertion part 1 is configured to be wider than the entrance part. Hand insertion part 1
The edges of the opening of the are all formed in a smooth R shape to improve the touch, and the inner surface of the hand insertion part 1 is treated with a water repellent paint to prevent water droplets and dirt from adhering. Has been done.

The hand insertion portion 1 is provided on the entrance side and the back side of the hand insertion portion 1.
A sensor 5 for detecting the entry and exit of the hand is attached. This sensor 5 has a plurality of photo Ls arranged side by side.
It is composed of an infrared ray emitting element such as ED and an infrared ray receiving element such as a plurality of phototransistors arranged side by side. The light emitting side is attached to the lower side wall surface, and the light receiving side is attached to the upper side wall surface which is less affected by external light. Has been.

As shown in FIGS. 2 and 3, the high-pressure airflow generator 3 comprises a DC brushless motor (which may be a normal commutator motor) 6 and a turbofan 7 rotated by the DC brushless motor 6. It is constructed as a unit, and in this embodiment, two machines are horizontally mounted on a base 8 which is an upper surface portion of a frame 4 which constitutes the bottom portion of the box body 2 with their suction ports 9 facing downward. A plurality of outlets 10 are opened on the outer periphery of the outer shell of the DC brushless motor 6 constituting the outlet side of each high-pressure airflow generator 3, and the air sucked from the inlet 9 is a turbo fan. 7 through the DC brushless motor 6 and is blown out from the blow-out port 10. A cylindrical packing 1 is provided between each high-pressure airflow generator 3 and the base 8 so as to surround the suction port 9.
1 are sandwiched in between. Each high-pressure air flow generator 3
Blower covers 12 which are open at both ends and which form a gap around each high-pressure airflow generator 3 are fixed to the outer periphery of the base 8. Each blower cover 12
Normally, the gap between the high pressure air flow generating device 3 and each of the high pressure air flow generating devices 3 is separated from the suction side in an airtight state by the packing 11 and the base 8. However, in this embodiment, the packing 11 and the base 8 respectively have ventilation passages. Several ventilation holes 13 that communicate with each other are formed, and these ventilation holes 13 communicate with the suction side.

The suction port 9 of the high-pressure airflow generator 3 is open so as to face the end structure of the suction path formed in the frame 4. The suction path has a suction port, which opens downward from the bottom of the box body 2 outside the machine, as an inlet end, and each high-pressure air flow generator 3
The intake box 14 facing the intake port 9 is a series of air passages having a terminal structure, and a duct vertically arranged between the intake port and the intake box 14.

The intake box 14 on the suction path is the frame 4
It is attached to the lower surface of the base 8 from below, and together with the base 8 forms a chamber as an air introduction portion to each high-pressure airflow generator 3. A sound absorbing pad is attached to the inner surface of the intake box 14 to absorb and attenuate mechanical driving noise and airflow driving noise associated with the operation of the high-pressure airflow generator 3. At the bottom of the box 2 of the suction path, a suction port opened downward to the outside of the machine is provided with a filter 15 in which a filter material made of a mesh, a polymer non-woven fabric, or the like is stretched horizontally or vertically in the frame of a resin frame. It is mounted so that it can be removed and replaced by pulling in and out in the direction or engaging and disconnecting.

As shown in FIG. 3, the open ends of the blower covers 12 provided on the outside of the high-pressure airflow generators 3 on the blower outlet 10 side are shown in FIG.
As shown in, the upper air duct 16 and the lower air duct 17
One end of each is connected. Upper air duct 1
6 and the other end of the lower air duct 17 are expanded into a flat trumpet shape, and an upper blowing nozzle 18 and a lower blowing nozzle 19 are attached to the horizontally elongated slit-shaped opening ends, respectively. A plurality of nozzle holes are formed in the upper blow nozzle 18 and the lower blow nozzle 19 in a row in the lateral direction at equal intervals, and the high pressure air sent from the high pressure air flow generator 3 is turned into a high-speed working air flow. It can be converted and blown out.

The upper blowing nozzle 18 is inclined downward so as to form an upper portion of the inlet of the manual insertion portion 1 and the lower blowing nozzle 19 is upwardly formed at a lower portion of the inlet of the manual insertion portion 1 so as to form a pressure gradient from the inlet to the back. It is attached laterally with a hand, and the working airflow is applied to both the back side and the palm side of the hand at the same time so that water drops on the hand can be removed from the front and back of the hand without rubbing the hands put in the hand insertion section 1. You can

The path from the outlet 10 of each high-pressure airflow generator 3 to the upper outlet nozzle 18 or the lower outlet nozzle 19 is a main flow passage for forming a main airflow that functions to dry the hand, whereas Each ventilation passage that communicates with the suction side through the gap formed by each blower cover 12 from the outlet 10 through the packing 11 and the ventilation hole 13 of the base 8 feeds back a part of each high pressure air flow to the high pressure air flow generator 3. This is the feedback flow path 20 for making the flow path. The feedback flow passage 20 forms a feedback component for raising the temperature of the main air flow.

The temperature of the working air flow for drying the hands is raised by
The purpose of this is to improve the comfort by eliminating the feeling of cold wind during use, such as during the severe winter season, and not to supplement the drying function. Therefore, the temperature itself of the working air flow need not be so high, and it is important to raise the temperature quickly. In order to realize this, some measures have been taken regarding the distribution of the working air flow and the feedback component depending on the number and diameter of the ventilation holes 13.

That is, the opening area of the feedback passage 20 facing each suction port 9 side is 1/10 to 1/4 of the total opening area of the nozzle holes of the upper blowing nozzle 18 and the lower blowing nozzle 19.
It is set in the range of degree. Feedback channel 20
The opening area itself is set by the ventilation hole 13. For example, if the nozzle holes are φ3.5mm each on the top and bottom,
When the total opening area of each is 7 and the total opening area is 356 mm ² ,
When the total opening area of the ventilation holes 13 is 98 mm ² , the temperature rise (deg) of the working airflow is as shown by A in FIG. 4, and the temperature rise of about 20 deg is realized after 5 minutes.

Ventilation holes 13 of this feedback channel 20
The opening area set by can be opened and closed by the adjusting plate 21 provided on the lower surface of the base. That is, the burring portion 22 is formed at the opening of the base 8 facing the suction port 9 of each high-pressure airflow generator 3.
An adjusting plate 21 is attached to each of the two so as to be rotatable. An adjusting hole 23 is formed in the adjusting plate 21 so as to be aligned with the ventilation hole 13 of the base 8. By rotating the adjusting plate 21, the ventilation hole 13 of the base 8 can be opened and closed. When the feedback passage 20 is closed by the adjusting plate 21, there is no feedback component, and the working airflow having a temperature just received by the high-pressure airflow generator 3 is blown out from the upper blowing nozzle 18 and the lower blowing nozzle 19. The temperature rise of the working airflow at this time is as shown by C in FIG. Note that FIG. 4 is under the conditions of an air flow rate of about 4 m ^{3 /} min, a blowing air velocity from the nozzle hole of about 75 m / s, an input of about 1950 W, and a rotational speed of the turbofan 7 of about 28000 rpm.

In the hand dryer having the above-mentioned structure, by inserting a wet hand into the hand insertion portion 1, the water content of the hand is manually inserted by the kinetic energy of the high-speed working air flow formed in the hand insertion portion 1. The part 1 can be blown away to the back side, and the drying process can be quickly performed in a state where the hand can be visually recognized without anxiety. At this time, the air sucked into each high-pressure airflow generator 3 is heated and blown out while being pressurized in each high-pressure airflow generator 3. At this time, if the feedback flow path 20 is opened by the adjusting plate 21, the main flow of the blown high-pressure air flow is guided to the upper blow nozzle 18 and the lower blow nozzle 19, and the working air flow for drying the hand is obtained. And a part of them is fed back to each high-pressure airflow generator 3. The feedback component from the feedback flow passage 20 is mixed with the main airflow by the second stage heating in addition to the above-described heating in each high-pressure airflow generating device 3, and is mixed into the main airflow nozzle 18 and the lower airflow nozzle 19 respectively. It is ejected as a warm working air flow, and part of it becomes a feedback component. That is, it is a hand dryer which is comfortable to use and does not require a feeling of cold wind and consumes less power in a severe winter season. The high-pressure airflow generator 3 may also be configured as a single unit, in which a main duct is vertically divided by a branch duct.

In the summer and the like, the feeling of cool air due to the working air flow may be rather comfortable. In such a case, the feedback plate 2 is operated by operating the adjusting plate 21.
Close 0. As a result, all of the high-pressure air flow heated and blown out in the high-pressure air flow generation device 3 is guided to the upper blowing nozzle 18 and the lower blowing nozzle 19, and becomes a working air flow for drying the hand.

Example 2. In this second embodiment, the feedback flow path 20 by the adjusting plate in the hand dryer shown in the first embodiment can be set to an arbitrary opening between fully closed and fully opened. Other than that, the same as in Example 1. Therefore, the drawing of the first embodiment is used as it is, and the description of the same parts will be omitted.

As shown in FIGS. 5 and 6, the hand dryer according to the second embodiment has an adjusting hole 23, which is aligned with an arcuate ventilation hole 13 formed in the base 8 of the adjusting plate 21, at the center of rotation. On the other hand, they are concentrically formed in an arc shape. The adjusting plate 21 is formed with an operating portion 24 that is pulled out to the rear surface of the apparatus, and the operating plate 24 can be operated to rotate the adjusting plate 21. The arc-shaped ventilation hole 13 formed in the base 8 can be adjusted to an arbitrary opening between fully closed and fully opened by the rotation amount of the adjusting plate 21.

By making the ventilation hole 13 of the base 8 and the adjustment hole 23 of the adjustment plate 21 into a long and narrow arc, the operation amount increases, but the opening degree can be delicately adjusted. It is possible to increase the adjustment range of the opening degree by reducing the amount. With this, the amount of the feedback component can be adjusted, and the temperature of the working airflow can be optimally adjusted according to the use environment and the use period. The temperature rise of the working fluid when the feedback component is adjusted to half is as shown by B in FIG. Since the other functions are the same as those of the first embodiment, the description thereof will be omitted.

The rotating operation of the adjusting plate 21 may be carried out by a remote operating mechanism by a release or a motor driving mechanism. When the adjusting plate 21 is rotated by a motor, it is possible to control the temperature of the working airflow to be set. That is, the operation amount of the adjusting plate 21 may be controlled by controlling the motor so that the target temperature is reached by the temperature detecting means for detecting the temperature of the working air flow and the temperature setting means.

Example 3. In the third embodiment, the adjusting plate 21 in the hand dryer shown in the second embodiment is configured to be a slide type, and the feedback channel 2 is formed by sliding the adjusting plate 21.
0 can be set to an arbitrary opening degree from fully closed to fully open, and other configurations are the same as those shown in the first and second embodiments. Therefore, the drawing of the first embodiment is used as it is, and the description of the same parts will be omitted.

As shown in FIG. 7, the hand dryer according to the third embodiment has an adjusting plate 21 that can be pulled in and out on the lower surface of the base 8 so as to be slidable in the front-rear direction. The adjusting plate 21 has a ventilation hole 1 formed in the base 8.
The adjusting hole 23 is formed so as to match with No. 3. Adjustment plate 21
An operation unit 24 is formed which can be operated back and forth from the front surface of the apparatus, and the operation of the operation unit 24 allows the adjustment plate 21 to slide back and forth. The portion of the base 8 corresponding to each suction opening is provided with an escape port 25 so as not to block them.
Is formed, and the burring portion 22 of the base 8 is slidably fitted into the escape opening 25. That is, the adjusting plate 2
The amount of the feedback component can be adjusted by adjusting the slide amount of 1 in the front-back direction. The other configurations and functions are the same as those of the first or second embodiment, and therefore the description thereof will be omitted.

[0038]

As is apparent from the above description of the embodiments, according to the invention of claim 1, the working air flow for drying the hands is changed according to the season and the environment of use without using a special heating means such as a heater. Depending on the condition, it can be heated or not, and a comfortable hand dryer can be obtained.

According to the second aspect of the present invention, the degree of warming of the working air flow for drying the hands can be adjusted by rotating the adjusting plate according to the season and the usage environment without using a special heating means such as a heater. It is possible to obtain a hand-drying device which can be adjusted and is comfortable to use.

According to the third aspect of the present invention, the degree of warming of the working air flow for drying the hands can be adjusted by sliding the adjusting plate according to the season and the environment of use without using a special heating means such as a heater. It is possible to obtain a hand-drying device which can be adjusted and is comfortable to use.

According to the invention of claim 4, in addition to the effect according to the invention of claim 2 or 3, the temperature of the working airflow can be easily adjusted from the outside.

[Brief description of drawings]

FIG. 1 is a side sectional view of a hand dryer according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the high-pressure airflow generator of FIG.

FIG. 3 is an exploded perspective view of a main part of the hand dryer of FIG.

FIG. 4 is an explanatory diagram showing the temperature rise of the working air flow of the embodiment in a graph.

FIG. 5 is an enlarged perspective view of a main part of the high-pressure airflow generator according to the second embodiment.

FIG. 6 is an enlarged cross-sectional view of the main part of the high-pressure airflow generator of Example 2.

FIG. 7 is an enlarged perspective view of a main part of a high-pressure airflow generator according to a third embodiment.

FIG. 8 is a sectional view showing a conventional hand dryer.

[Explanation of symbols]

 1 Manual Insertion Section 3 High Pressure Air Flow Generator 6 DC Brushless Motor 7 Turbo Fan 8 Base 9 Suction Port 10 Outlet 12 Blower Cover 13 Vent Hole 18 Upper Blowing Nozzle 19 Lower Blowing Nozzle 20 Feedback Channel 21 Adjusting Plate 23 Adjusting Hole 24 Operation part

Claims (4)

[Claims] 1. A hand-drying process in which a high-pressure airflow generated by a high-pressure airflow generator is ejected as a high-speed working airflow by a nozzle over a hand held over the processing unit, and the kinetic energy of the working airflow blows away water from the hand to dry the hand. A device, wherein a feedback flow path for feeding back a part of the high-pressure air flow generated by the high-pressure air flow generation device in the high-pressure air flow generation device is provided, and the feedback flow path is provided in a part of this feedback flow path. A hand dryer which is provided with an opening / closing means for opening / closing. 2. A hand-drying process in which a high-pressure air flow generated by a high-pressure air flow generator is ejected as a high-speed working air flow by a nozzle over a hand held over the processing unit, and the kinetic energy of the working air flow blows away moisture from the hand to dry the hand. A device, wherein a feedback flow path for feeding back a part of the high-pressure air flow generated by the high-pressure air flow generation device in the high-pressure air flow generation device is provided, and suction of the high-pressure air flow generation device in the feedback flow path A hand drying device, wherein an adjusting plate having an adjusting aperture opening for adjusting the opening area of the opening portion from 0 to fully opened is rotatably provided in the opening portion on the side. 3. A hand-drying process in which a high-pressure air flow generated by a high-pressure air flow generator is ejected as a high-speed working air flow by a nozzle over a hand held over the processing section, and the kinetic energy of the working air flow blows away moisture from the hand to dry the hand. A device, wherein a feedback flow path for feeding back a part of the high-pressure air flow generated by the high-pressure air flow generation device in the high-pressure air flow generation device is provided, and suction of the high-pressure air flow generation device in the feedback flow path A hand drying device, wherein an adjusting plate having an adjusting aperture opening for adjusting the opening area of the opening portion from zero to full opening is slidably provided on the side opening portion. 4. The hand dryer according to claim 2 or 3, wherein the adjusting plate can be rotated outside the device.