JP3760469B1 - Hand dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand-drying device capable of reducing ventilation resistance and blowing sound in a nozzle that blows air to a hand arranged at a predetermined position.
SOLUTION: A hand drying device 1 according to the present invention includes a housing 2 having an opening recess 4 that opens upward as a hand drying portion into which a user's hand is inserted, and a housing that forms an opening recess. A plurality of upper side blowing nozzles 6b that are provided on the back side of the upper side wall and blow air out to the inside of the opening recess, and air is provided on the back side of the palm side wall of the housing that forms the opening recess. A plurality of palm side blowing nozzles 6a, each of the former side blowing nozzles and the palm side blowing nozzles are provided with nozzle inlet portions 32a, 32b and nozzle outlet portions 34a, 34b. It is characterized by a substantially truncated cone shape that is squeezed at a predetermined squeezing angle α from the nozzle inlet part toward the nozzle outlet part.
[Selection] Figure 7

Description

  The present invention relates to a hand-drying device, and more particularly to a hand-drying device that reduces ventilation resistance and blowing sound in a nozzle that blows air to a hand placed at a predetermined position.

Conventionally, as a typical hand-drying device, when a wet hand after washing is inserted into a hand-drying unit and placed in a predetermined position, the back side and palm side of the hand from a plurality of nozzles arranged in the hand-drying unit Some are dried by blowing wind.
In these conventional hand-drying apparatuses, for example, as described in Patent Document 1, the nozzle holes arranged in the hand-drying section have a pore shape extending straight from the inlet to the outlet in a cylindrical shape. In addition, it is known that the nozzle hole has a three-dimensional curved cross-sectional shape that expands in the vicinity of the nozzle outlet after the nozzle hole is once squeezed from the nozzle inlet to a minimum diameter.

Japanese Patent No. 2720722

However, in the above-described conventional hand drying apparatus, the air flow is sharply restricted when air passes through the nozzle hole from the upstream side of the nozzle, so that the airflow resistance increases and the air volume necessary for hand drying. There is a problem that the required power per hit becomes large. In addition, this causes a problem that a blowing sound when air blows out from the outlet of the nozzle also increases.
Furthermore, in the conventional hand dryer of the type in which the cross-sectional shape of the nozzle hole described above is a three-dimensional curve, the flow path is rapidly narrowed when air passes through the nozzle hole from the upstream side of the nozzle. After that, the shape spreads in the vicinity of the nozzle outlet, and the wind diffuses depending on the shape. As a result, there is a problem that a large amount of air is required to obtain a predetermined amount of air at a location away from the nozzle outlet, resulting in an increase in required power. In addition, when a vortex is generated by the diffused wind, there is a problem that the blowing sound of the wind is further increased.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and provides a hand drying device that reduces airflow resistance and blowing sound in a nozzle that blows air to a hand placed at a predetermined position. It is an object.

In order to achieve the above object, the present invention is a hand drying device that blows air on both sides of the back and palm of a user to dry the hand, and is opened upward as a hand drying unit into which the user's hand is inserted. And a plurality of upper side blowout nozzles that are provided on the back side of the upper side wall corresponding to the back of the hand of the housing that forms the opening recess, and that blows air inward of the opening recess, and an opening. A plurality of palm side blowing nozzles that are provided on the back side of the palm side wall of the housing that forms the recesses and blows air inwardly of the opening recesses, and each of the upper side blowing nozzle and the palm side blowing nozzle is a nozzle The flow path of the outlet portion is formed in a truncated cone that is narrowed at a narrowing angle of 5 to 20 degrees from the nozzle inlet toward the nozzle outlet.
According to the present invention configured as described above, when a hand is placed in the opening recess of the housing, air passes through the upper side blowing nozzle and the palm side blowing nozzle from the nozzle inlet toward the nozzle outlet, and this nozzle Wind is blown toward the hand from the exit. In addition, the flow passages of the nozzle outlet portions of the upper side blowing nozzle and the palm side blowing nozzle are formed in a truncated cone that is narrowed at a restriction angle of 5 degrees to 20 degrees from the nozzle inlet toward the nozzle outlet. Ventilation resistance can be reduced, and the hands disposed in the opening recesses can be efficiently dried. Further, it is possible to reduce the blowing sound when the wind blows from the nozzle outlet of the upper side blowing nozzle and the palm side blowing nozzle.

  In the present invention, preferably, among the plurality of upper side blowing nozzles and palm side blowing nozzles, the central axis of the nozzle located in the vicinity of the right hand insertion range is set so that air is blown toward the center of the right hand insertion range. The center axis of the nozzle located near the insertion range of the left hand is set so that air blows out toward the center of the insertion range of the left hand. Thereby, the hand arrange | positioned in an opening recessed part can be dried efficiently.

  In the present invention, it is preferable that the upper side blowing nozzle and the palm side blowing nozzle are set such that the closer to the side of the housing, the center axis is directed downward. Thereby, scattering of the water droplet by a wind in an opening recessed part can be suppressed.

  In the present invention, preferably, the plurality of upper side blowing nozzles and palm side blowing nozzles are provided separately from the housing, and the housing has a plurality of blowing holes to which the first side blowing nozzles and the palm side blowing nozzles are attached. The diameter of this blowout hole is set larger than the diameter of the nozzle outlet. Thereby, each blowing hole of a housing does not affect the blowing of the wind from each nozzle exit.

  In the present invention, preferably, the plurality of upper side blowing nozzles and palm side blowing nozzles are integrally formed for each predetermined number.

  According to the hand drying apparatus of the present invention, it is possible to reduce the airflow resistance and the blowing sound in the nozzle that blows air to the hand arranged at a predetermined position.

Hereinafter, an embodiment of a hand dryer according to the present invention will be described with reference to the accompanying drawings.
1 and 2 are a front view and a rear view showing a hand drying apparatus according to an embodiment of the present invention, and FIGS. 3 and 4 are views of A of the hand drying apparatus according to the embodiment of the present invention shown in FIG. It is -A sectional drawing and BB sectional drawing. FIG. 5 is a plan view showing a hand dryer according to an embodiment of the present invention, and FIG. 6 is a schematic cross-sectional view showing a use state in a hand dryer of the hand dryer according to an embodiment of the present invention. is there. 1 to 6, the flow of air or wind is indicated by arrows.

As shown in FIGS. 1-5, the hand dryer 1 of this embodiment is provided with the housing 2 surrounding a hand dryer main body. In the upper part of the housing 2, an opening recess 4 having an open upper end is provided so that both hands lined up from above the housing 2 can be inserted.
This opening recessed part 4 is a part (hand drying part) which arrange | positions a hand there and applies wind and dries. Usually, the hand is inserted into the opening recess (hand drying part) 4 from above the housing 2 with the palm facing the front 2a side of the housing 2 and the back of the hand facing the back 2b side of the housing 2. Yes.

Hereinafter, for convenience of explanation, in the part (element) constituting the hand drying device 1 of the present embodiment, each name of the related element for drying the palm side of the hand arranged in the hand drying unit 4 is “ "Palm side" will be attached, and the name of the relevant part for drying the back side of the hand will be attached as "Back side".
Further, as shown in FIG. 6, in the hand drying device 1 of the present embodiment, a hand is inserted from above the housing 2 into the opening recess (hand drying portion) 4, and the palm side of the opening recess (hand drying portion) 4. When the sensors 3a and 3b provided on the wall surface 4a and the instep side wall surface 4b respectively detect a hand, a plurality of palm side nozzles 6a and an instep side electrode provided on each of the wall surfaces 4a and 4b in a substantially horizontal straight line. Hot air is blown from the nozzle 6b (details will be described later) to the palm side and back side of the hand, and flows downward while blowing water droplets adhering to the hand.

Furthermore, as shown in FIG. 5, when each dimension of the housing 2 is inserted into the opening concave portion (hand drying portion) 4 side by side with an adult's hands, the palm and the back of the hand become the opening concave portion (hand drying portion) 4. The palm side wall surface 4a and the upper side wall surface 4b are dimensioned so as not to contact each other.
For example, the lateral width w of the housing 2 is preferably 200 mm to 350 mm, and most preferably 300 mm.
The depth d1 of the housing is preferably 120 mm to 250 mm, and most preferably 180 to 200 mm.
Furthermore, the distance d2 between the palm-side nozzle 6a and the back-side nozzle 6b is preferably 70 mm to 100 mm, and most preferably 85 mm.
The height of the housing 2 is preferably 450 mm to 700 mm, and most preferably 680 mm.

  Furthermore, louvers 5 as air venting means are provided on both side surfaces 2c and 2d of the housing 2 (see FIGS. 3 and 4), and warm air is supplied from the nozzles 6a and 6b to the hand disposed in the hand drying unit 4. The water droplets scattered in the direction of the side surfaces 2 c and 2 d of the housing 2 when the air is blown are blocked by the louver 5 so that only the wind passes through the louver 5.

Also, in the housing 2, palm-side and back-side fan motor units 8a, 8b for blowing air to the palm-side and back-side nozzles 6a, 6b are provided adjacent to each other.
Each fan motor unit 8a, 8b is arranged such that its rotational drive shafts 10a, 10b extend in a direction perpendicular to the front surface 2a and / or the back surface 2b of the housing 2 (see FIGS. 3 and 4).
The palm-side and upper-side fan motor units 8a, 8b have the same form and the same maximum output, and both can change the rotational speed of the rotary drive shafts 10a, 10b as desired. ing. When the hand dryer 1 is used, the fan motor units 8a and 8b are set so that the palm-side rotary drive shaft 10a rotates at a higher speed than the back-side rotary drive shaft 10b. It is preferable to make it larger than the air volume supplied to the side.
The upper fan motor unit 8b is disposed adjacent to the bottom of the housing 2, and the palm fan motor unit 8a has a palm-side rotation drive shaft 10a with respect to the upper-side rotation drive shaft 10b. The upper side fan motor unit 8b is disposed adjacent to the upper front obliquely so as to be located obliquely above the front.

Further, palm-side and back-side suction ports 14a, 14b are provided at the rear ends of the respective casings 12a, 12b of the respective fan motor units 8a, 8b.
On the other hand, palm-side and upper-side outlets 16a and 16b projecting upward are formed at the downstream ends of the outlet ducts 15a and 15b of the fan motor units 8a and 8b, respectively. The air outlets 16a and 16b are respectively provided with palm side and instep side fin heaters 18a and 18b so that the air blown from the air outlets 16a and 16b can be warmed by the fin heaters 18a and 18b. It has become.

A water receiving tray 19 is provided at the bottom 2 e of the housing 2, and the water that has fallen on the shoulder-shaped bottom surface 4 c and swept on both sides in the hand drying unit 4 is drained at the inner side of the housing 2. It falls in the water receiving tray 19 through a groove (not shown).
Further, an air intake 22 having a filter 20 is provided on the back side of the water receiving tray 19, and palm-side and instep-side intake ducts 24 a and 24 b are connected to the air intake 22. Yes.
The intake ducts 24a and 24b have their upstream ends 26a and 26b arranged on the filter 20 of the air intake port 22 so that the upstream ends 26a and 26b communicate with the intake ports 14a and 14b. The ends 26a and 26b extend substantially straight upward along the back surface 2b of the housing 2.
During the operation of the hand dryer 1, the air outside the housing 2 is separately sucked into the intake ducts 24 a and 24 b through the air intake port 22 and the filter 20.

Further, in the upper portions of the respective intake ducts 24a and 24b, palm-side and upper-side sound absorbing materials 28a and 28b are respectively arranged adjacent to the respective suction ports 14a and 14b of the respective fan motor units 8a and 8b. The sound absorbing materials 28a and 28b absorb sound leaked from the suction ports 14a and 14b during operation of the fan motor units 8a and 8b, respectively.
Further, a palm-side air duct 30a is connected to the palm-side air outlet 16a, and the palm-side air duct 30a is formed to extend upward from the air outlet 16a adjacent to the front surface 2a of the housing 2. Has been.
Further, the back surface in the palm-side air duct 30a forms the palm side wall surface 4a of the opening recess (hand drying portion) 4 described above. The nozzle 6a is arranged so as to be positioned almost directly above the palm-side air outlet 16a (see FIG. 3).
On the other hand, a back side air duct 30b is connected to the back side air outlet 16b similarly to the palm side air outlet 16a, and this back side air duct 30b opens from the back side air outlet 16b. It is formed to extend to a plurality of upper side nozzles 6b arranged on the upper side wall surface 4b of the recess (hand drying portion) 4 (see FIG. 4).

Next, the configuration of the above-mentioned palm side and back side nozzles 6a and 6b will be described in detail.
7 is a partially enlarged cross-sectional view of the palm-side nozzle of the hand drying apparatus according to the embodiment of the present invention shown in FIG. 3, and FIG. 8 is a view of the hand drying apparatus according to the embodiment of the present invention shown in FIG. FIG. 9 is a partially enlarged cross-sectional view of the upper side nozzle, and FIG. 9 is a schematic perspective view of the hand drying unit of the hand drying device according to the embodiment of the present invention as viewed obliquely from the front.

As shown in FIGS. 7 to 9, a plurality of palm-side and back-side nozzles 6a, 6b are arranged in a substantially horizontal straight line on the palm side of the hand drying unit 4 and the back side of the back side walls 4a, 4b. The plurality of palm-side and back-side nozzles 6a, 6b are integrally formed with flanges 44a, 44b for each predetermined number.
The nozzles 6a and 6b are preferably made of a material such as ABS (acrylonitrile-butadiene-styrene resin) or PP (polypropylene), and the plurality of nozzles 6a and 6b including the flanges 44a and 44b are unidirectional. It is integrally molded by die cutting.
The flanges 44a and 44b are heat caulked to support protrusions 46a and 46b that are formed integrally with the wall surfaces 4a and 4b and project toward the flanges 44a and 44b.

The nozzles 6a and 6b include nozzle inlets 32a and 32b and nozzle outlets 34a and 34b, respectively. From each nozzle inlet 32a, 32b to each nozzle outlet 34a, 34b, the flow path cross section (longitudinal section) of each nozzle 6a, 6b has a hollow truncated cone shape with a predetermined throttle angle α (see FIG. 7 and FIG. 8).
That is, the above-described aperture angle α is such that the inner contour lines 40a and 40b in the virtual longitudinal section of the truncated head portion of the truncated cone including the central axes 36a and 36b of the nozzles 6a and 6b are the virtual vertices 38a and 38b. Are the angles (vertical angles) that intersect each other (see FIGS. 7 and 8). Here, the truncated cone includes those obtained by obliquely cutting off the head portion of the cone.
The throttle angle α is such that the wind speed increases at a position (hand placement position) about 15 mm to 30 mm away from the blow holes 42a, 42b of the wall surfaces 4a, 4b inward in the horizontal direction of the hand drying section 4. Preferably, it is set to about 5 to 20 degrees, and most preferably about 5 to 15 degrees.
The diameter of each nozzle outlet 34a, 34b is preferably about 2.5 to 5 mm. The distance from each nozzle inlet 32a, 32b to each nozzle outlet 34a, 34b is preferably about 10 to 25 mm. The distance at which the nozzles 6a and 6b are arranged substantially linearly is preferably about 7 mm to 12 mm as the distance between the centers of the nozzles 6a and 6b. For this reason, the diameters of the nozzle inlets 32a and 32b are If it is set to 12 mm or less, the adjacent nozzle does not overlap with the hole, and preferably about 3 to 12 mm. Therefore, the aperture angle α is preferably set to about 5 degrees to 20 degrees, and most preferably about 5 degrees to 15 degrees.

Furthermore, each nozzle outlet 34a, 34b is connected to the blowing holes 42a, 42b formed in each wall surface 4a, 4b. The diameters of the outlet holes 42a and 42b are set to be larger than the diameters of the nozzle outlets 34a and 34b, and the outlet holes 42a and 42b of the wall surfaces 4a and 4b are adapted to receive air from the nozzle outlets 34a and 34b. It has a structure that does not affect the blowing condition.
Here, the diameter of each blowing hole 42a, 42b is preferably about 4 to 7 mm.

Further, the nozzles 6a and 6b have predetermined axial axes 36a and 36b of the nozzles 6a and 6b with respect to the wall surfaces 4a and 4b by heat caulking between the flanges 44a and 44b and the support protrusions 46a and 46b. It is inclined at an inclination angle β (hereinafter referred to as “the inclination angle of the nozzle center axis”).
Here, the inclination angle β of the nozzle center axis is an angle formed between the surface normals 50a and 50b and the center axes 36a and 36b at the end surfaces 48a and 48b of the blow holes 42a and 42b of the wall surfaces 4a and 4b. (See FIGS. 7 and 8).
Further, as described above, each of the nozzles 6a and 6b is formed by integrally molding a plurality of nozzles by die cutting from one direction. In order to facilitate the integral molding by this die cutting, The inclination angle β of the axis is preferably set to ½ or less of the aperture angle α.
Furthermore, the inner peripheral edges 52a and 52b of the nozzle inlets 32a and 32b are rounded with a radius of curvature of 0.5 mm or more (see FIGS. 7 and 8). The airflow resistance of the air flowing into the nozzle inlets 32a and 32b is reduced.

  Further, in FIG. 5, when both hands of the user are placed in a range (hand placement range) 54 surrounded by a broken line in the hand drying unit 4 of the hand drying device 1, Although the wind direction in the horizontal plane of the wind blown toward is indicated by an arrow, each nozzle 6a, 6b has a wind blown from each nozzle 6a, 6b within the arrangement range 54 of both hands as shown in FIG. Inclined in the direction of the center 56. The relative inclination of the central axis of each nozzle 6a, 6b caused by the inclination of each nozzle 6a, 6b is preferably set to ½ or less of the aperture angle α of each nozzle 6a, 6b. In this way, it is possible to integrally form a plurality of nozzles by punching from one direction, and it is possible to manufacture a nozzle with stable wind blowing performance at low cost.

Further, in FIG. 9, representative nozzle center axis lines located at the left end, the center, and the right end of the plurality of upper side nozzle holes 42 b arranged linearly on the upper side wall surface 4 b of the hand drying unit 4. Are denoted by β1, β2, and β3, respectively, and the direction of the air blown from each nozzle hole 42b is indicated by an arrow.
As shown in FIG. 9, the wind blown out from the upper side blowout hole 42 b is blown out downward in the hand drying section 4 as a whole. Further, the inclination angle β of the nozzle center axis increases as the position of the upper side blowout hole 42b approaches the both side surfaces 2c and 2d of the housing 2, and in particular, the inclination angles β1 and β3 of the nozzles located at both ends are β2 Is bigger than. That is, the upper side nozzle 6b is directed so that the wind blows downward most from the nozzle holes located at both ends of the array.
Note that the palm-side nozzle 6a is also inserted in the lower direction so that the wind direction becomes lower as the position of the palm-side outlet hole 42a approaches the both side surfaces 2c and 2d of the housing 2 in the same manner as the former-side nozzle 6b. Is directed. Also here, as described above, it is preferable that the relative inclination of the central axis of each nozzle 6a, 6b is set to ½ or less of the aperture angle α of each nozzle 6a, 6b.

Next, the operation (operation) of the hand dryer 1 according to the embodiment of the present invention described above will be described.
When both hands are inserted side by side into the hand drying section 4 of the housing 2 of the hand dryer 1 and placed in the predetermined range 54, the sensors 3a and 3b detect the hands and the fan motor units 8a and 8b are activated. To do.
By the operation of the fan motor units 8a and 8b, air is taken into the intake ducts 24a and 24b from the air intake port 22 of the housing 2 through the filter 20.
The air taken into the intake ducts 24a and 24b is sucked into the fan motor units 8a and 8b from the suction ports 14a and 14b, respectively.
And air is warmed by each fin heater 18a, 18b in each blower outlet 16a, 16b of each fan motor unit 8a, 8b, and blown off to each ventilation duct 30a, 30b. The air in the air ducts 30a and 30b passes through the nozzle outlets 34a and 34b from the nozzle inlets 32a and 32b of the nozzles 6a and 6b, and is placed in the predetermined range 54 of the hand drying unit 4 side by side. Hot air is blown to the palm side and back side at high speed.
Further, when wind blows toward both hands at each nozzle outlet 34a, 34b (each blow hole 42a, 42b), the wind is blown out so as to concentrate mainly on the center 56 of both hands within the predetermined range 54, and within the predetermined range 54 Wind hits both hands placed in the.
Furthermore, as the position of each nozzle 6a, 6b approaches the side surfaces 2c, 2d of the housing 2, the wind is blown out further downward.

FIG. 10 is a diagram (constant velocity diagram) showing the result of analyzing the velocity distribution of the wind blown from each nozzle outlet 34a, 34b for each aperture angle α of each nozzle 6a, 6b.
Here, in this analysis, the distance from the nozzle inlet to the outlet is 10 mm, the nozzle outlet diameter is 4 mm, and the nozzle throttle angle α is 0 degree, 5 degrees, 10 degrees, 15 degrees, 20 degrees, The wind speed distribution in the case of one nozzle was examined with the pressure set around 25 degrees, the pressure around the nozzle inlet being 6.5 kPa, and the pressure around the nozzle outlet being atmospheric pressure.
As shown in FIG. 10, the wind blown from the nozzle has the highest speed near the outlet of the nozzle, and gradually decreases as the distance from the nozzle increases. Also, the speed is high near the center axis of the nozzle of the blown wind, and the speed decreases as the distance from the center axis increases. The wind speed in the vicinity of the nozzle outlet is approximately the same at about 100 m / s for the nozzles at each aperture angle.
Further, in FIG. 10, when comparing the flow of the wind inside the nozzle, when the throttle angle α is 0 degree, the region of the maximum flow velocity starts near the nozzle inlet, and the flow velocity suddenly increases near the nozzle inlet. Is rising.
On the other hand, with a nozzle having a throttle angle of 5 degrees or more, it can be seen that the flow velocity gradually increases inside the nozzle. In general, it is known from the Bernoulli's theorem, etc. that the flow resistance is large in a place where the flow velocity changes greatly. It can be seen that the resistance near the entrance is the largest. On the contrary, when the aperture angle is 5 degrees or more, the resistance of the nozzle is smaller than that when the aperture angle is 0 degrees, and it can be said that a large air volume can be obtained efficiently.
When comparing the wind blown from the nozzles having different throttle angles in FIG. 10, first, in the case of a cylindrical nozzle having a throttle angle α of 0 degree, the region where the wind speed is 100 m / s or more is about 15 mm from the nozzle outlet. On the other hand, in the case of a nozzle with an aperture angle of 5 to 25 degrees, it extends to near 20 mm from the nozzle outlet.
Next, the region where the wind speed is 90 m / s or more extends to about 25 mm from the nozzle outlet when the throttle angle is 5 degrees to 20 degrees, while it is slightly shorter when the throttle angle is 0 degrees and 25 degrees. It has become.
Further, the region where the wind speed is 70 m / s or more is shorter than the others when the aperture angle is 25 degrees, and the region where the wind speed is 50 m / s or more is different from the others when the aperture angle is 20 degrees or more. It is shorter than that.

FIG. 11 is a graph showing the results of analyzing the relationship between the aperture angle of the nozzle and the average wind speed in the palm-side and back-side nozzles of the hand dryer according to one embodiment of the present invention. Here, FIG. 11 shows an average over a range of 5 mm in diameter centered on the central axis of the nozzle at positions where the separation distance from the nozzle outlet is 20 mm and 30 mm, respectively, based on the result of the wind speed distribution shown in FIG. It investigated about wind speed.
As shown in FIG. 11, at the position where the distance from the nozzle outlet is 20 mm, the average wind speed when the aperture angle is 0 degree is about 61 m / s, whereas the average when the aperture angle is 5 degrees to 20 degrees. The wind speed is about 66 m / s or more, which is larger than that when the aperture angle is 0 degree. The average wind speed is maximized when the aperture angle is 10 degrees to 20 degrees.
On the other hand, at a position where the distance from the nozzle outlet is 30 mm, the average wind speed when the aperture angle is 0 degree and 25 degrees is about 56 m / s, whereas the average wind speed when the aperture angle is 5 degrees to 20 degrees is It is about 58 m / s or more, which is larger than the aperture angles of 0 degrees and 25 degrees, and is almost the maximum.
In general, as the wind speed increases, the force to blow off water drops increases, so a nozzle with a higher average wind speed is more suitable for drying hands. Further, when the hand is dried using the hand drying device of the present embodiment, the hand is arranged in the hand drying unit 4 so that the surface of the hand comes to a position about 20 mm to 30 mm away from the nozzle outlet. It has become. Therefore, it was found that a nozzle with a throttle angle of 5 degrees to 20 degrees at which the average wind speed is large at both positions 20 mm and 30 mm away from the nozzle outlet is preferable for comfortable hand drying.
Summarizing the analysis results of FIG. 10 and FIG. 11, in the case of one nozzle, when the aperture angle is 5 degrees to 20 degrees, at both positions separated by a predetermined distance (20 mm, 30 mm) from the nozzle outlet. It became clear that a large air volume can be obtained efficiently because the average wind speed increases.
On the other hand, when arranging a plurality of nozzles, if the aperture angle is larger than 15 degrees, the holes at the adjacent nozzle inlets may overlap. The flow can also be unstable. Therefore, in consideration of obtaining a large air volume efficiently and the stability of the air flow, it is most preferable to set the nozzle throttle angle to 5 to 15 degrees.

FIG. 12 (a) shows the distance from the inlet to the outlet of each nozzle is 10 mm and the diameter of the outlet of each nozzle is 4 mm in the palm-side and back-side nozzles of the hand dryer according to one embodiment of the present invention. FIG. 11 is a diagram showing the result of numerical analysis of the blowing state of wind when the aperture angle α of each nozzle is 15 degrees. FIG. 12 (b) shows a palm-side and back-side nozzle of the hand dryer, wherein the distance from the inlet to the outlet of each nozzle is 10 mm, the diameter of the outlet of each nozzle is 4 mm, and the restriction of each nozzle. It is a figure which shows the result of having carried out the numerical analysis of the blowing state of the wind in case the angle (alpha) is 0 degree | times.
Comparing the results of FIG. 12A and FIG. 12B, the region of the blown air represented by the constant velocity line shows that the nozzle aperture angle α is greater when the nozzle aperture angle α is 15 degrees. It is longer than the case of 0 degree and extends without interference to a position farther away from the nozzle outlet.
Further, regarding the line around the blown air, when the nozzle throttle angle α is 15 degrees, the turbulence is smaller and the occurrence of turbulence is smaller than when the nozzle throttle angle α is 0 degrees. Inferred.
That is, the arrangement of nozzles when the nozzle aperture angle α is 15 degrees causes interference between the wind of one nozzle and the wind of the adjacent nozzle compared to the nozzle when the nozzle aperture angle α is 0 degrees. Therefore, the wind noise can be reduced because the friction between the winds is small and the turbulent flow is small.

According to the hand drying apparatus 1 according to the embodiment of the present invention described above, the palm-side and back-side nozzles 6a, 6b provided in the hand drying unit 4 are connected to the nozzle outlets 34a, 34b from the nozzle inlets 32a, 32b, respectively. Since a hollow frustum is formed that is throttled at a predetermined throttle angle α over 34b, the ventilation resistance when passing through the nozzle is smaller than that of the conventional nozzle, and the sound generated when passing is also The sound generated after blowing out the nozzle is also reduced. Further, high-speed air can be collected at the position where the hands are separated from the nozzle outlets 34a and 34b (blow-out holes 42a and 42b) by a predetermined distance, and both hands can be efficiently dried.
Further, according to the hand drying apparatus 1 according to the present embodiment, the aperture angle α of each of the nozzles 6a and 6b is set to about 5 degrees to 20 degrees, so that the separation of the wind blown from the nozzle outlets 34a and 34b is small. As a result, the wind speed can be increased at a point (hand placement position) about 15 mm to 30 mm away from the blow holes 42a, 42b of the wall surfaces 4a, 4b inward in the horizontal direction of the hand drying unit 4, Moreover, the blowing sound of the nozzle can be reduced.
Furthermore, according to the hand drying apparatus 1 according to the present embodiment, the nozzles 6a and 6b are directed so that the wind blown from the nozzles 6a and 6b is concentrated on the center 56 in the hand arrangement range 54. As the positions of the holes 42a and 42b approach the two side surfaces 2c and 2d of the housing 2, the nozzles 6a and 6b are directed downward so that the wind direction becomes lower. As a result, wind can be collected in the hand arrangement range 54 and both hands can be efficiently dried. Moreover, since the nozzle located near the both side surfaces 2c and 2d of the housing 2 blows a downward wind toward the hand, scattering of water droplets attached to the hand can be suppressed.
Further, according to the hand drying device 1 according to the present embodiment, since the inclination angle β of the nozzle center axis is set to ½ or less of the aperture angle α, a plurality of nozzles are integrated by die cutting from one direction. It can shape | mold and can suppress manufacturing cost.
Furthermore, according to the hand dryer 1 according to the present embodiment, the inner peripheral edges 52a and 52b of the nozzle inlets 32a and 32b are rounded with a radius of curvature of 0.5 mm or more. It is possible to reduce the ventilation resistance of the wind flowing from the ducts 30a and 30b into the nozzle inlets 32a and 32b, and to suppress the power required to obtain a predetermined air volume.

Next, FIG. 13 is a plan view similar to FIG. 5, showing a hand dryer according to another embodiment of the present invention. Here, in FIG. 13, the same parts as those in FIG.
As shown in FIG. 13, in the hand drying device 60 of the present embodiment, when the left hand and the right hand of the user are respectively disposed within the ranges (hand placement ranges) 64 a and 64 b surrounded by the broken lines, each nozzle 6 a , 6b are arranged so that the air is intensively blown from the nozzles 6a, 6b toward the respective centers 66a, 66b of the ranges 64a, 64b, that is, toward one hand of the ranges 64a, 64b. Is directed.
Further, in the hand drying device 60 of the present embodiment, as in the above-described hand drying device 1, the nozzles 6 a and 6 b have their wind directions downward as their positions approach the two side surfaces 2 c and 2 d of the housing 2. So that it is directed downward.

According to the hand dryer 60 according to another embodiment of the present invention described above, when wind blows from the nozzles 6a and 6b, the wind is blown mainly toward the respective centers 56 in the predetermined ranges 64a and 64b. The wind hits one hand at a time in the range 54. As a result, both hands can be efficiently dried.
In addition, according to the hand drying device 60 according to the present embodiment, the nozzles located near the both side surfaces 2c and 2d of the housing 2 blow a downward wind toward the hand, as in the hand drying device 1 described above. , It is possible to suppress the scattering of water droplets adhering to the hand.

It is a front view which shows the hand dryer by one Embodiment of this invention. It is a rear view which shows the hand dryer by one Embodiment of this invention. It is AA sectional drawing of the hand-drying apparatus by one Embodiment of this invention shown in FIG. It is BB sectional drawing of the hand-drying apparatus by one Embodiment of this invention shown in FIG. It is a top view which shows the hand-drying apparatus by one Embodiment of this invention. It is a schematic sectional drawing which shows the use condition in the hand drying part of the hand drying apparatus by one Embodiment of this invention. FIG. 4 is a partial enlarged cross-sectional view of a palm-side nozzle of the hand drying device according to the embodiment of the present invention shown in FIG. 3. It is a partial expanded sectional view of the nozzle for the back side of the hand-drying apparatus by one Embodiment of this invention shown in FIG. It is the schematic perspective view which looked at the hand drying part of the hand drying apparatus by one Embodiment of this invention from diagonally forward. It is a figure which shows the result of having analyzed the velocity distribution of the wind which blows off from a nozzle exit about every nozzle aperture angle about the palm side nozzle and the back side nozzle of the hand-drying apparatus by one Embodiment of this invention. It is a graph which shows the result of having analyzed the relationship between the aperture angle of a nozzle and the average wind speed in the nozzle for palm sides and the back side of a hand dryer by one embodiment of the present invention. FIG. 12A shows the result of numerical analysis of the blowing state of the wind when the aperture angle α of each nozzle is 15 degrees in the palm side and back side nozzles of the hand dryer according to one embodiment of the present invention. FIG. 12 (b) is a diagram showing the result of numerical analysis of the blowing state of the wind when the aperture angle α of each nozzle is set to 0 degree in the palm-side and back-side nozzles of the hand dryer. It is. It is a top view similar to FIG. 7 which shows the hand-drying apparatus by other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,60 Hand dryer 2 Housing 3a, 3b Sensor 4 Hand drying part 4a Palm side wall surface of hand drying part 4b Back side wall surface of hand drying part 5 Louver 6a Palm side nozzle 6b Back side nozzle 8a Palm side fan motor Unit 8b Upper-side fan motor unit 10a Rotational drive shaft of palm-side fan motor unit 10b Rotational drive shaft of upper-side fan motor unit 12a Casing of palm-side fan motor unit 12b Casing of upper-side fan motor unit 14a Palm Side inlet 14b Upper side inlet 15a Palm side fan motor unit outlet duct 15b Upper side fan motor unit outlet duct 16a Palm side outlet 16b Upper side outlet 18a Palm side fin heater 18b Upper Side fin heater 19 Water receiving tray 20 Filter 22 Air intake 24 a Palm-side intake duct 24b Back-side intake duct 26a Upstream end of the palm-side intake duct 26b Upstream end of the back-side intake duct 28a Palm-side sound absorbing material 28b Upper-side sound absorbing material 30a Palm-side air duct 30b Upper Side air duct 32a Palm side nozzle inlet 32b Back side nozzle inlet 34a Palm side nozzle outlet 34b Back side nozzle outlet 36a Center axis of the palm side nozzle 36b Center axis of the back side nozzle 38a, 38b For palm side Virtual vertices of nozzles (conical truncated cones) 40a, 40b Inner contour line of upper side nozzle (conical truncated cone) 42a Palm side outlet hole 42b Upper side outlet hole 44a Palm side nozzle flange 44b Upper side nozzle flange 46a , 46b Support projection 48a End surface of the palm-side air outlet 48b End surface of the back-side air outlet 50a Normal of the end surface of the palm-side air outlet 50b End surface of the back-side air outlet Normal line 52a Inner peripheral edge of palm-side nozzle inlet 52b Inner peripheral edge of upper-side nozzle inlet 54, 64a, 64b Hand placement range 56, 66a, 66b Center of hand placement range

Claims (5)

A hand drying device that blows air on both the back of the user's hand and the palm to dry it,
A housing in which an upper opening is formed at the upper end of an opening recess that is opened upward to be a hand drying unit into which a user's hand is inserted;
A plurality of upper side blowing nozzles provided on the back side of the upper side wall corresponding to the back of the hand of the housing forming the opening recess, and for blowing out air inward of the opening recess;
A plurality of palm side blowing nozzles that are provided on the back side of the palm side wall of the housing that forms the opening recess and that blows air inward of the opening recess;
Each of the upper side blowing nozzle and the palm side blowing nozzle is formed in a truncated cone in which the flow path of the nozzle outlet portion is narrowed at a restriction angle of 5 degrees to 20 degrees from the nozzle inlet toward the nozzle outlet. A hand dryer characterized by that. Among the plurality of upper side blowing nozzles and palm side blowing nozzles , the central axis of the nozzle located in the vicinity of the right hand insertion range is set so that air is blown toward the center of the right hand insertion range, and the left hand insertion range The hand dryer according to claim 1, wherein the central axis of the nozzle located in the vicinity is set so that air blows out toward the center of the insertion range of the left hand.   The hand drying apparatus according to claim 1, wherein the upper side blowing nozzle and the palm side blowing nozzle are set such that the closer to the side of the housing, the center axis is directed downward.   The plurality of upper side blowing nozzles and palm side blowing nozzles are provided separately from the housing, and the housing is formed with a plurality of blowing holes to which the upper side blowing nozzle and the palm side blowing nozzle are attached, The hand dryer according to claim 1, wherein the diameter of the blowout hole is set larger than the diameter of the nozzle outlet.   The hand dryer according to claim 4, wherein the plurality of upper side blowing nozzles and palm side blowing nozzles are integrally formed for each predetermined number.

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