HK1103951B - Hand drying apparatus - Google Patents

Description

Hand drying device

Technical Field

The present invention relates to a hand dryer for blowing air to wet hands after washing and hygienically drying the hands.

Background

As a conventional hand drying device, there is a device in which a hand drying chamber having an opening at an upper portion of a main body is provided, an air blowing mechanism housed inside the main body is communicated to air outlets of at least 3 places through a plurality of nozzles, a heating mechanism is provided in an air passage shared by the plurality of nozzles, a space in which both hands rub against each other is formed in the hand drying chamber so that the air outlets do not face each other, a drain port is provided at a bottom portion in the hand drying chamber, a control mechanism is provided at a lower portion of the main body, and a detection mechanism for detecting an inserted hand is provided in the hand drying chamber (see, for example, patent document 1).

Patent document 1: japanese patent laid-open No. 2001-346715 (page 4, FIG. 1)

Disclosure of Invention

However, the above-described conventional hand drying device has a problem that the airflows from the 3 blow-out ports collide with each other, and thus the airflow is disturbed and the noise is large.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a hand dryer with low noise.

In order to solve the above problems and achieve the object, a hand dryer according to the present invention includes a first nozzle that ejects a first air flow from a first inner wall surface side of a hand insertion chamber toward a second inner wall surface, and a second nozzle that ejects a second air flow from the second inner wall surface side toward the first inner wall surface; the method is characterized in that: the jet axis of the air flow jetted from the other nozzle by one nozzle is arranged in a staggered manner towards the inner side of the hand insertion chamber, so that the jet axes of the first and second air flows do not collide with each other, and the inner wall surface of the inlet side of the one nozzle positioned at the inner side of the hand insertion chamber, namely the inner wall surface of the inlet side of the other nozzle, which is collided by the air flow from the other nozzle, is inclined towards the inner side of the hand insertion chamber.

According to the present invention, since the first and second air flows are separated from each other and do not collide with each other, the hand dryer having a low noise and a quick drying effect can be obtained.

Drawings

Fig. 1 is a longitudinal sectional view showing embodiment 1 of the hand dryer of the present invention.

Fig. 2 is a plan view showing embodiment i of the hand drying device of the present invention.

Fig. 3 is a front view showing a form of an ejection port of the nozzle.

Fig. 4 is a diagram showing the details of the air flow.

Fig. 5 is a graph (a vertical line figure) showing a relationship between the amount of deviation of the nozzle position and the drying time.

Fig. 6 is a graph showing the relationship between the amount of deviation of the nozzle position and noise.

Fig. 7 is an explanatory view of the air flow.

Fig. 8 is a front view showing another form of the discharge port of the nozzle.

Fig. 9 is a front view showing still another mode of the discharge port of the nozzle.

Fig. 10 is a front view showing still another mode of the discharge port of the nozzle.

Fig. 11 is a front view showing still another mode of the discharge port of the nozzle.

Fig. 12 is a longitudinal sectional view showing embodiment 2 of the hand dryer of the present invention.

Fig. 13 is an explanatory view of a comparative example of the hand drying device of embodiment 1.

Detailed Description

Embodiments of the hand drying device of the present invention will be described in detail below with reference to the accompanying drawings. The present embodiment does not limit the present invention.

Embodiment mode 1

Fig. 1 is a vertical sectional view showing embodiment 1 of the hand dryer of the present invention, fig. 2 is a plan view showing embodiment l of the hand dryer of the present invention, fig. 3 is a front view showing the form of the ejection port of the nozzle, fig. 4 is a view showing the details of the air flow, fig. 5 is a graph showing the relationship between the amount of deviation of the nozzle position and the drying time, fig. 6 is a graph showing the relationship between the amount of deviation of the nozzle position and the noise, fig. 7 is an explanatory view of the operation of the air flow, fig. 8 to 11 are front views showing other forms of the ejection port of the nozzle, and fig. 13 is an explanatory view of a comparative example of the hand dryer of embodiment 1.

As shown in fig. 1 and 2, the hand drying device 1 having a substantially rectangular parallelepiped shape with the back surface 30 side attached to the wall of the room has a hand insertion chamber 2 having a substantially U-shaped groove shape with an opening at the upper side and the left and right sides (the left and right sides may be closed). The inner wall surface 3 of the hand insertion chamber 2 has a front surface 4 as a first inner wall surface, a substantially vertical rear lower surface 7, a rear upper surface 6 as a second inner wall surface inclined toward the inside of the hand insertion chamber 2, and a bottom surface 8 whose central portion is low.

A drain port 9 for draining water splashed by hands is provided in a lower center portion of the bottom surface 8, a drain pipe 10 is connected to the drain port 9, and a lower end of the drain pipe 10 is connected to a drain tank 11.

The upper part of the front surface 4 and the corner parts of the front surface 4 and the bottom surface 8 of the hand insertion chamber 2 are provided with infrared light emitting parts 12 and 14 as first and second hand detection means for detecting the presence or absence of hand insertion, respectively. The infrared light emitting units 12 and 14 detect the presence or absence of hand insertion in cooperation with an infrared light receiving unit 13 provided at the center of the rear upper surface 6.

The hand dryer 1 includes an air supply pipe 18 for supplying high-pressure air to first and second nozzles 15 and 16 described later. A high-pressure air supply device 19 is connected to the air supply pipe 18. A detachable filter 21 for removing dust and the like in the intake air is provided at the intake port 20 of the high-pressure air supply device 19.

A first nozzle 15 for jetting a first air flow a toward the rear upper surface 6 (second inner wall surface) is provided at an upper portion of the front surface 4 (first inner wall surface) of the hand insertion chamber 2, and a second nozzle 16 for jetting a second air flow c toward the front surface 4 (first inner wall surface) is provided at an upper portion of the rear upper surface 6 (second inner wall surface). The first and second nozzles 15 and 16 are arranged in a vertically staggered position, that is, the position of the first nozzle 15 is staggered below the position of the second nozzle 16 (inside the hand insertion chamber 2).

As shown in fig. 3, the first and second nozzles 15 and 16 have a plurality of circular hole-shaped discharge ports 15a and 16a aligned in a row in the left-right direction. As shown by arrows in fig. 1, the first and second nozzles 15 and 16 are provided such that the positions of the first nozzles are shifted downward (toward the inside of the hand insertion chamber 2) from the jet axes of the air streams discharged from the second nozzles so that the jet axes of the first and second air streams a and c discharged do not collide with each other until they collide with the inner wall surfaces facing each other.

As shown in fig. 4, the first and second air flows a and c ejected from the first and second nozzles 15 and 16 travel while expanding their diameters. In the air flows a, c just after being discharged from the first and second nozzles 15, 16, the jet axis a is₄、c₄The surrounding central part forms a wedge-shaped constant velocity region a with a sharp downstream side and no velocity attenuation₁、c₁In the isokinetic region a₁、c₁A diameter-expanding part a is formed around the inner wall of the chamber₂、c₂. The constant velocity region disappears at a position separated from the tip end portions of the first and second nozzles 15 and 16 by a distance of about 5 times the nozzle diameter, and the radial velocity distribution of the first and second air flows a and c is formed as a gentle mountain-shaped velocity distribution a having a center portion as a vertex₃、c₃。

In general, the diameter of the discharge port of the nozzle is about 4mm when the circular hole discharge port is provided, and the constant velocity region a₁、c₁Has a length of about 5 × 4mm to about 20mm, and the nozzle-to-nozzle distance between the opposing nozzles 15 and 16 is about 80mm, so that when the offset amount between the jet axes a4 and c4 is small and the airflows a and c collide with each other, the velocity distributions of the airflows a and c are gentle as described above at the collision position (the intermediate position 40mm away from the tip end portions of the nozzles 15 and 16), and the expanded diameter portion a is formed as a gentle velocity distribution₂、c₂The flow velocity is reduced at the outer peripheral portion of (2). In addition, even the jet axis a₄、c₄Are offset from each other to some extent although the diameter-expanded portions a₂、c₂The outer peripheral portions of (a) will interfere with each other, but since the flow velocity of the outer peripheral portions is slow, noise is not generated.

In the present specification, as shown in fig. 4, the tip end portions of the first and second nozzles 15 and 16 are connected to each other by a straight line D, and the midpoint of the straight line D is set as a base point O from the base point O to each jet flow axis a₄、c₄Perpendicular lines are drawn, distances A, B of the perpendicular lines are obtained, and the distance A + B is defined as a jet axis a₄、c₄The offset from each other. In addition, the jet axis a may be set₄、c₄The mutual offset is referred to as "offset of nozzle position".

As shown in fig. 1, the inner wall surface 3 above the first nozzle 15 (the inlet side of the hand insertion chamber 2) where the second air flow c discharged from the second nozzle 16 collides becomes a streamline-shaped inclined surface 17 having a concave curved surface shape inclined toward the inside of the hand insertion chamber 2, and the second air flow c discharged from the second nozzle 16 collides with the inclined surface 17 to flow down along the air flow of the inclined surface 17, comes into contact with the first air flow a discharged from the first nozzle 15 from above, and presses down the first air flow a. Since the inclined surface 17 is formed in a streamlined concave curved surface shape, noise is not generated even if the air flow c collides therewith.

The first air flow a of the first nozzle 15 which is pressed down flows downward away from the second air flow c which is ejected from the second nozzle 16, collides with the rear upper surface 6, flows downward, and flows toward the rear lower surface 7.

Jet axis a of first and second air flows a, c₄、c₄The offset in the vertical direction (offset of the nozzle position) is preferably set to 5mm to 30 mm. As shown in fig. 5, the drying time (sec) when the offset amount (mm) is changed is approximately 7sec, 6.5sec, 6sec, and 7sec, and is approximately U-shaped curve when the offset amount is 0mm, 5mm, 10mm, 20mm, and 30 mm. In the offset range of 5 mm-30 mm, the drying time is less than 0mm (jet axis a)₄、c₄When colliding with each other).

As shown in fig. 6, when the air flow a of the first nozzle 15 is not pushed down, and the noise change (dB) when the offset amount (mm) of the nozzle position is changed is about 57.5dB, 57dB, 56dB, 53dB when the offset amount is 0mm, 5mm, 10mm, 20mm, respectively, the noise is reduced as the offset amount increases.

In addition, the amount of vertical offset between the first air flow a of the first nozzle 15 and the second air flow c of the second nozzle 16 increases by the depression, and the noise further decreases. Thus, if the offset amount is set to 5mm to 30mm, the drying efficiency is good and the noise is reduced.

In addition to the above configuration, the air flow rate is usually adjusted so that the aperture of the first nozzle 15 is larger than the aperture of the second nozzle 16, and the air flow rate of the first nozzle 15 facing the palm is larger than the air flow rate of the second nozzle 16 facing the back of the hand.

Next, the operation of the hand dryer 1 of embodiment 1 will be described. First, when a wet hand is inserted into the hand insertion chamber 2, the palm is generally directed toward the front side, opposite to the first nozzle 15. The first and second hand detection means 12 and 14 detect the insertion of a hand. A control means (not shown) for determining that a hand is inserted operates the high-pressure air supply device 19 to suck air from the air inlet 20. At this time, dust and the like in the air are removed by the filter 21, and clean high-pressure air is generated in the high-pressure air supply device 19.

The clean high-pressure air is supplied to the first and second nozzles 15 and 16 through the air supply pipe 18, and as shown by arrows in fig. 1 and 2, the clean high-pressure air is ejected as first and second air flows a and c and comes into contact with the hand. The hands are dried without causing the hands inserted into the hand insertion chamber 2 to rub against each other so that water droplets fly from the surface of the hands onto the inner wall surface 3 of the hand insertion chamber 2. The water droplets blown off flow from the drain port 9 through the drain pipe 10 into the drain tank 11 and are stored, so that the surroundings of the hand drying device 1 are not wetted by the splashed water droplets.

Thereafter, during the drying operation in which the hand is moved to the upper side of the hand insertion chamber 2, the first hand detection means 12 continues to detect the hand while the hand is in the hand insertion chamber 2, and therefore the first and second air flows a and c continue to be ejected from the first and second nozzles 15 and 16, so that moisture on the surface of the hand and the like can be removed, and the hand can be further dried. When the hand is completely removed from the hand insertion chamber 2 and the first hand detection means 12 cannot detect the hand, the operation is stopped after the operation is continued for a short time. In the drying operation, the first and second air flows a and c ejected from the first and second nozzles 15 and 16 are vertically offset, and therefore, moisture on both the palm and the back of the hand can be efficiently removed.

When the drying operation is completed and the operation is continued after the hand is completely extracted from the hand insertion chamber 2, the first air flow a of the first nozzle 15 is pressed downward so as to further increase the amount of vertical displacement from the second air flow c ejected from the second nozzle 16, and therefore, the air flows a and c do not collide with each other, and the air flow collision noise does not occur, and therefore, the noise can be reduced.

In particular, as shown in fig. 7 (and fig. 1), when the inclined surface 17 is provided, the second air stream c ejected from the second nozzle 16 collides with the inclined surface 17 to form an air stream along the wall surface, and the air stream is directed downward by the inclined surface 17 to contact the first air stream a of the first nozzle 15, thereby pressing down the first air stream a of the first nozzle 15 downward so as to further increase the amount of deviation from the second air stream c ejected from the second nozzle 16 in the vertical direction.

Further, the second air flow c discharged from the second nozzle 16 is directed downward by the inclined surface 17, and does not flow upward (toward the inlet side) and is blown to the user, so that the user feels better. The rear upper surface 6 and the rear lower surface 7 are formed in an inverted く shape, and the first air flow a discharged from the first nozzle 15 collides with the rear upper surface 6 inclined downward (inward) of the hand insertion chamber 2 and descends along the rear lower surface 7 as an air flow b, so that it does not interfere with the second air flow c discharged from the second nozzle 16, and the generation of noise can be suppressed.

In contrast, in the comparative example of fig. 13, the front surface 4a is simply formed in a flat shape without forming the inclined surface 17 shown in fig. 1 and 7, and in this case, the second air flow c discharged from the second nozzle 16a collides with the front surface 4a, and the branched air flow e is blown upward (toward the inlet side) along the front surface 4a to the user, which impairs the feeling of use, which is not preferable.

In addition, when the rear upper surface is not inclined downward (inward) of the hand insertion chamber 2 as shown in fig. 13, the first air flow a discharged from the first nozzle 15a collides with the rear surface 5a, and the branched one air flow f blows upward along the rear surface 5a and collides with the second air flow c discharged from the second nozzle 16 a. At this time, turbulence is generated in the second air flow c, and this turbulence propagates from the downward air flow d branched at the front surface 4a to the first air flow a, the air flow f branched at the rear surface 5a, and further to the second air flow c, and the air flows are disturbed as a whole, and large pulsation noise occurs.

As is apparent from the surface properties of the hand, the moisture adhesion force of the palm is stronger than that of the back of the hand, and the palm is not easily dried, but the moisture removal degree of the palm and the back of the hand inserted into the hand insertion chamber 2 can be made uniform by making the air volume of the first nozzle 15 facing the palm larger than the air volume of the second nozzle 16 facing the back of the hand. In addition, since the first nozzles 15 are provided to be shifted to the lower side of the second nozzles 16, the drying efficiency is improved.

In the above description, the plurality of discharge ports of the first and second nozzles 15 and 16 are arranged in a line, but as shown in fig. 8, the plurality of discharge ports 15a and 16a may have a slit shape which is long on the left and right, or as shown in fig. 9, the plurality of discharge ports 15a and 16a may be arranged in a shape of "ヘ" which is high at the center. Further, as shown in fig. 10, the ejection port 15a or 16a may have a slit shape formed in a shape of "ヘ", or as shown in fig. 11, the ejection port 15a or 16a or a plurality of ejection ports may have a slit shape arranged in a shape of "ハ".

By forming the slit-shaped ejection port long on the left and right sides, the air flow without the break can be ejected and the hand can be dried uniformly. Further, since the ejection port is arranged in the shape of "ヘ", the ejection port is orthogonal to the right and left hands inserted obliquely into the hand insertion chamber 2 from right and left, and therefore, the hand drying efficiency is improved. Further, since the air is not ejected to the central portion where the hand is not inserted by arranging the ejection port in the shape of "ハ", the energy efficiency of the hand drying device 1 is improved.

In the above description, the first and second air flows a and c ejected from the first and second nozzles 15 and 16, respectively, are made substantially parallel to each other before colliding with the wall, and the air flows are made not to collide with each other before reaching the wall, thereby preventing the generation of noise, but the orientations of the first and second nozzles 15 and 16 may be set so as to be distant from each other before the ejected air flows collide with the opposite wall, instead of being parallel to each other.

The position of the second nozzle 16 may be shifted to be below the position of the first nozzle 15 (inside the hand insertion chamber 2), the inner wall surface 3 above the second nozzle 16 (on the inlet side of the hand insertion chamber 2) where the air stream ejected from the first nozzle 15 collides is formed as an inclined surface inclined toward the inside of the hand insertion chamber 2, the first air stream a ejected from the first nozzle 15 collides with the inclined surface, and the second air stream c ejected from the second nozzle 16 is brought into contact with the inclined surface from above to press down the second air stream c.

Embodiment mode 2

Fig. 12 is a longitudinal sectional view showing embodiment 2 of the hand dryer of the present invention. In fig. 12, portions having the same functions as those of the portions shown in fig. 1 are denoted by the same reference numerals.

As shown in fig. 12, the hand dryer 1 having a substantially rectangular parallelepiped shape with the back surface 30 side attached to the wall of the room has a hand insertion chamber 2 having a substantially "コ" groove shape and opened at the front and left and right sides (the left and right sides may be closed). The inner wall surface 3 of the hand insertion chamber 2 has an upper surface 22 as a second inner wall surface with an inlet side (front) inclined upward, a substantially vertical rear surface 24, and a bottom surface 25 as a first inner wall surface with an inner side (rear) inclined relatively low.

A drain port 9 for draining water splashed by hands is provided at a lower rear portion of the bottom surface 25, a drain pipe 10 is connected to the drain port 9, and a lower end of the drain pipe 10 is connected to a drain tank 11.

A hand detection mechanism 12 for detecting the presence or absence of hand insertion is provided in the center of the upper surface 22 of the hand insertion chamber 2. The hand detection mechanism 12 is an infrared light emitting unit, and detects the presence or absence of hand insertion in cooperation with an infrared light receiving unit, not shown, provided on the opposing inner wall surface 3.

The hand dryer 1 includes an air supply pipe 18 for supplying high-pressure air to first and second nozzles 15 and 16 described later. A high-pressure air supply device 19 is provided in the air supply pipe 18, and air from the high-pressure air supply device 19 is guided to the first and second nozzles 15 and 16 by the air supply pipe 18. An air intake pipe 26 is provided at the rear of the air supply pipe 18, and a detachable filter 21 for removing dust and the like in the intake air is provided at an intake port 20 located at the lower portion thereof.

A first nozzle 15 for jetting the first air flow a toward the bottom surface 25 (second inner wall surface) is provided on the inlet side (front side) of the upper surface 22 (first inner wall surface) of the hand insertion chamber 2, and a second nozzle 16 for jetting the second air flow c toward the upper surface 22 (first inner wall surface) is provided on the inlet side (front side) of the bottom surface 25 (second inner wall surface). The first and second nozzles 15 and 16 are provided at positions shifted in the front-rear direction, that is, the position of the first nozzle 15 is shifted to the rear of the position of the second nozzle 16 (the inside of the hand insertion chamber 2).

As shown in fig. 3, the first and second nozzles 15 and 16 have a plurality of circular hole-shaped discharge ports 15a and 16a aligned in a row in the left-right direction. As shown by arrows in fig. 12, the first and second nozzles 15 and 16 are provided such that the positions of the first nozzle 15 are shifted rearward (toward the inside of the hand insertion chamber 2) from the jet axes of the air streams c ejected from the second nozzle so that the jet axes of the first and second air streams a and c ejected do not collide with each other until the jet axes collide with the inner wall surfaces facing each other. The air volume of the second nozzle 16 is set to be larger than the air volume of the first nozzle 15.

The upper surface 22 on the inlet side (front side) of the first nozzle 15, on which the second air stream c ejected from the second nozzle 16 collides, is formed as a streamlined concave curved surface-shaped inclined surface 17 inclined toward the inside (rear side) of the hand insertion chamber 2, and the second air stream c ejected from the second nozzle 16 collides with the inclined surface 17, becomes an air stream along the inclined surface 17 and is directed rearward, and comes into contact with the first air stream a ejected from the first nozzle 15 from the front side, and the first air stream a is directed rearward. Since the inclined surface 17 is formed in a streamlined concave curved surface shape, noise is not generated even if the air flow c collides therewith.

The first air flow a of the first nozzle 15 directed rearward is directed rearward away from the second air flow c discharged from the second nozzle 16, collides with the bottom surface 25, is directed rearward, and flows rearward on the bottom surface 25. The offset amount of the jet axes of the first and second air flows a, c in the front-rear direction is preferably set to 5mm to 30 mm.

Next, the operation of the hand dryer 1 of embodiment 2 will be described. First, when a wet hand is inserted into the hand insertion chamber 2, the palm is generally directed downward, opposite the second nozzle 16. The hand detection mechanism 12 detects the insertion of a hand. A control means (not shown) for determining that a hand is inserted operates the high-pressure air supply device 19 to suck air from the air inlet 20. At this time, dust and the like in the air are removed by the filter 21, and clean high-pressure air is generated in the high-pressure air supply device 19.

Clean high-pressure air is supplied to the first and second nozzles 15 and 16 through the air supply pipe 18, and as shown by arrows in fig. 11, first and second air flows a and c are formed and ejected to come into contact with the hand. Without rubbing the hands inserted into the hand insertion chamber 2, water droplets are blown off from the surface of the hands onto the inner wall surface 3 of the hand insertion chamber 2, thereby drying the hands. The water droplets blown off flow from the drain port 9 to the drain tank 11 through the drain pipe 10 and are stored, so that the surroundings of the hand drying device 1 are not wetted by the splashed water droplets.

Thereafter, even in the operation of moving the hand to the front of the hand insertion chamber 2 for drying, the hand detection mechanism 12 continues to detect the hand while the hand is in the hand insertion chamber 2, and therefore the first and second air flows a and c continue to be ejected from the first and second nozzles 15 and 16, so that the hand can be further dried by removing moisture on the surface of the hand. When the hand is completely removed from the hand insertion chamber 2 and the hand detection mechanism 12 does not detect the hand, the operation is stopped after the operation is continued for a short time. In the drying operation, the first and second air flows a and c ejected from the first and second nozzles 15 and 16 are offset in the front-rear direction, and therefore, moisture on both the palm and the back of the hand can be efficiently removed.

When the drying operation is finished and the operation is continued after the hand is completely extracted from the hand insertion chamber 2, the first air flow a of the first nozzle 15 is directed rearward so as to further increase the amount of displacement in the front-rear direction from the second air flow c ejected from the second nozzle 16, and therefore the air flows a and c do not collide with each other, and the air flow collision noise does not occur, and therefore, the noise can be reduced.

Further, the second air flow c discharged from the second nozzle 16 is directed rearward by the inclined surface 17 and flows out to the inlet side (front) without being blown to the user, so that the user feels comfortable. Further, since the bottom surface 25 is inclined so as to become lower in the rear direction, the first air flow a discharged from the first nozzle 15 collides with the bottom surface 25 and is directed rearward, and does not interfere with the second air flow c discharged from the second nozzle 16, thereby suppressing the generation of noise.

As is apparent from the surface properties of the hand, the moisture adhesion force of the palm is stronger than that of the back of the hand, and the palm is not easily dried, but the moisture removal degree of the palm and the back of the hand inserted into the hand insertion chamber 2 can be made uniform by making the air volume of the second nozzle 16 facing the palm larger than the air volume of the first nozzle 15 facing the back of the hand. Further, since the first nozzles 15 are provided at positions shifted to the rear (inner side) of the second nozzles 16, the drying efficiency is improved.

In the above description, the plurality of discharge ports of the first and second nozzles 15 and 16 are arranged in a line, but as shown in fig. 8, the plurality of discharge ports 15a and 16a may have a slit shape which is long on the left and right, or as shown in fig. 9, the plurality of discharge ports 15a and 16a may be arranged in a shape of "ヘ" which is high at the center. Further, as shown in fig. 10, the discharge port may have a slit shape formed in a shape of "ヘ", or as shown in fig. 11, the discharge port may have a slit shape 15a or 16a or a plurality of discharge ports arranged in a shape of "ハ".

In the above description, the first and second air flows a and c ejected from the first and second nozzles 15 and 16 are made substantially parallel to each other before colliding with the wall, and the air flows are made not to collide with each other before reaching the wall, thereby preventing the occurrence of noise, but the orientations of the first and second nozzles 15 and 16 may be set so as to be distant from each other before the ejected air flows collide with the opposite wall, instead of being parallel to each other.

The position of the second nozzle 16 may be shifted to be set to the rear of the position of the first nozzle 15 (the inside of the hand insertion chamber 2), the inner wall surface 3 of the front of the second nozzle 16 (the inlet side of the hand insertion chamber 2) against which the air stream ejected from the first nozzle 15 collides may be formed as an inclined surface inclined toward the inside of the hand insertion chamber 2, the first air stream a ejected from the first nozzle 15 may collide against the inclined surface, and the second air stream c ejected from the second nozzle 16 may be brought into contact from the front side, so that the second air stream c may be directed inward.

Industrial applicability of the invention

As described above, the hand dryer of the present invention is suitable for installation in public facilities and the like as a low-noise and quick-drying hand dryer.

Claims (10)

1. A hand drying device comprises a first nozzle and a second nozzle, wherein the first nozzle ejects a first air flow from a first inner wall surface side of a hand insertion chamber to a second inner wall surface, and the second nozzle ejects a second air flow from the second inner wall surface side to the first inner wall surface; the method is characterized in that:

the first nozzle is provided with a jet axis of the air flow jetted from the second nozzle in a staggered manner toward the inner side of the hand insertion chamber, so that the jet axes of the first and second air flows do not collide with each other, the portion of the first inner wall surface above the first nozzle, where the second air flow jetted from the second nozzle collides with the first inner wall surface, is formed as a streamlined concave curved surface-shaped inclined surface inclined toward the inner side of the hand insertion chamber, and the second air flow jetted from the second nozzle collides with the inclined surface, is formed to flow down along the air flow of the inclined surface, and contacts the first air flow jetted from the first nozzle from above to press down the first air flow.

2. The hand drying apparatus of claim 1, wherein: the inclined surface is formed in a concave surface shape.

3. The hand drying apparatus of claim 1, wherein: the second inner wall surface on which the air flow jetted from the first nozzle collides is inclined toward the inner side of the hand insertion chamber.

4. The hand drying apparatus of claim 1, wherein: the offset of the jet axes of the first and second air flows is in the range of 5mm to 30 mm.

5. The hand drying apparatus of claim 1, wherein: the orientations of the first and second nozzles are set so that the jet axes of the first and second air flows are parallel to or distant from each other.

6. The hand drying apparatus of claim 1, wherein: the first and second nozzles have a plurality of discharge ports arranged in a row in the left-right direction.

7. The hand drying apparatus of claim 1, wherein: the first and second nozzles have slit-shaped discharge ports that are long in the left-right direction.

8. The hand drying apparatus of claim 1, wherein: the first and second nozzles have a plurality of discharge ports or slit-shaped discharge ports arranged in a shape of "ヘ" with a high center portion.

9. The hand drying apparatus of claim 1, wherein: the first mentioned,

The second nozzle has a plurality of discharge ports or slit-like discharge ports arranged in a shape of "ハ" with the center portion thereof closed.

10. The hand drying apparatus of claim 1, wherein: the air volume of the nozzle facing the palm of the hand is larger than the air volume of the nozzle facing the back of the hand.