JP3791009B2 - Hand dryer - Google Patents

Description

  The present invention relates to a hand dryer, and more particularly, to a hand dryer that reduces noise during operation of a fan motor that sends wind to a hand placed at a predetermined position.

2. Description of the Related Art Conventionally, as a typical hand drying apparatus, there is one that automatically sends wind to the back side and palm side of a hand when the wet hand after washing is placed at a predetermined position.
In these conventional hand dryers, a fan motor is used as a means for blowing air to dry a hand placed at a predetermined position. However, noise generated during operation of the fan motor generates noise from the entire hand dryer. Therefore, how to reduce the noise generated from the fan motor has been a conventional problem.
Conventionally, in such a hand dryer intended to reduce the noise of the fan motor, for example, as described in Patent Document 1, a flat filter is provided so as to close the inlet of the fan motor. When the air is sucked from the suction port of the fan motor, sound is absorbed by passing through a plate-like filter, or as described in Patent Document 2, A cylindrical filter is provided on the extension, and when air is sucked from the suction port of the fan motor, the cylindrical filter is passed through to absorb sound.

JP 2002-34836 A Japanese Patent No. 3125539

However, in such a conventional hand dryer, since the suction port of the fan motor is blocked by a filter, the air resistance when the air passes through the filter is large, and instead of the input from the suction port, the output from the fan motor. There is a problem that it is difficult to obtain the air volume.
Also, if the airflow output from the fan motor is not reduced, the fan motor must be rotated at a higher speed, which increases the required power of the fan motor, and the vibration and noise of the fan motor. There is a problem that becomes large.

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and reduces the airflow resistance to the suction port of the fan motor, and the noise generated from the fan motor leaks to the outside. The object is to provide a hand-drying device to reduce.

  In order to achieve the above object, a first invention of the present invention is a hand drying device that blows air on a user's hand to dry, and is an opening recess serving as a hand drying unit into which the user's hand is inserted. Formed in the housing, an air intake port provided in the housing, an air blowing part provided on the wall surface of the housing forming the opening recess, and blowing air to the hand drying part, a drive shaft, air A fan motor means having an air inlet for sucking in air, an air outlet for blowing out air, and an air intake duct extending from the air inlet to the air inlet of the fan motor means, and the outlet wall of the fan motor means Adjacent to the intake duct formed with an outlet facing the air inlet, the outlet duct extending from the air outlet of the fan motor means to the air outlet, and the air inlet of the fan motor means of the intake duct A sound absorbing material means disposed on a portion of the air intake duct, the sound absorbing material means being provided on an inner surface of the intake duct near the fan motor means in the vicinity of the outlet of the intake duct and supplying air to the air intake port of the fan motor means. Including a front sound-absorbing material in which a single ventilation hole is formed, and a rear sound-absorbing material provided on the inner surface of the air intake duct far from the fan motor means so as to face the air intake port of the fan motor means. The front sound absorbing material is configured such that the vent hole has a smaller diameter than the outlet of the intake duct so that the surface of the part sound absorbing material on the side of the fan motor means faces the suction port of the fan motor means. It is characterized by being.

In the first invention of the present invention configured as described above, the fan motor means operates when a hand is placed in the opening recess of the housing. Next, air is taken into the intake duct from the air intake. The air in the intake duct passes through the rear sound absorbing material and flows into the vent holes of the front sound absorbing material. The air passes through the outlet of the intake duct and is sucked into the air suction port of the fan motor means. Further, the air is blown out from the air blowout port of the fan motor means to the blowout duct, and finally blown out from the air blowout portion to the inside of the opening recess.
Here, a part of the noise generated in the fan motor means and leaked upstream from the air suction port is opposed to the suction port of the fan motor means because the vent hole has a smaller diameter than the outlet of the intake duct. Absorbed by the front sound absorbing material. Further, the noise leaked upstream from the motor fan means is absorbed by the rear sound absorbing material provided on the inner surface of the intake duct far from the fan motor means so as to face the air intake port of the fan motor means. As a result, according to the present invention, it is possible to reduce leakage of noise generated from the fan motor means to the outside of the housing.

In the first invention of the present invention, preferably, the front sound-absorbing material is configured such that the vent hole has a diameter substantially the same as the air suction port of the fan motor means.
In the first invention of the present invention configured as above, noise flowing out from the air suction port of the fan motor means to the upstream side can be effectively absorbed and reduced by the front sound absorbing material.

In the first invention of the present invention, preferably, the sound absorbing material means further includes a rectifying sound absorbing material arranged between the front sound absorbing material and the rear sound absorbing material to rectify the air in the intake duct.
In the first invention of the present invention configured as above, air flowing to the air suction port of the fan motor means in the intake duct is rectified by the rectifying and sound absorbing material, so that the ventilation resistance to the air suction port is reduced. be able to. Further, since the noise of the fan motor means that is not absorbed by the sound absorbing material and leaks further upstream is absorbed by the rectifying sound absorbing material, it is possible to reduce the leakage of the noise to the outside.

  A second aspect of the present invention is a hand drying device that blows air on a user's hand to dry the housing, the housing having an opening recess that serves as a hand drying portion into which the user's hand is inserted, and the housing. Provided in the wall surface of the housing that forms the opening recess, and an air blowing portion that blows air to the hand-drying portion, a drive shaft, an air suction port for sucking air, and air blowing A fan motor means having an air outlet and an air intake duct extending from an air intake port to an air intake port of the fan motor means, and an outlet wall facing the air intake port of the fan motor means is formed on the outlet wall thereof The air intake duct, the air outlet duct extending from the air outlet of the fan motor means to the air outlet, and the sound absorbing material means disposed in a portion of the air intake duct adjacent to the air inlet of the fan motor means The sound-absorbing material means is provided on the inner surface of the intake duct near the fan motor means near the outlet of the intake duct and has a single vent hole for supplying air to the air intake port of the fan motor means. The front sound absorbing material, the rear sound absorbing material provided on the inner surface of the intake duct far from the fan motor means and facing the air suction port of the fan motor means, and between the front sound absorbing material and the rear sound absorbing material A rectifying sound absorbing material arranged and rectifying air in the intake duct, the rectifying sound absorbing material forming a fan-shaped rectifying passage in front view communicating with the vent hole by surrounding the upper side of the vent hole of the front sound absorbing material It is configured as described above.

In the second invention of the present invention configured as described above, the fan motor means operates when a hand is placed in the opening recess of the housing. Next, air is taken into the intake duct from the air intake. The air in the intake duct passes through the rear sound absorbing material and flows into the vent holes of the front sound absorbing material. The air passes through the outlet of the intake duct and is sucked into the air suction port of the fan motor means. Further, the air is blown out from the air blowout port of the fan motor means to the blowout duct, and finally blown out from the air blowout portion to the inside of the opening recess.
Here, a part of the noise generated in the fan motor means and leaked upstream from the air suction port is caused by the front sound absorbing material provided on the inner surface of the intake duct near the fan motor means near the outlet of the intake duct. Absorbed. Further, the noise leaked upstream from the fan motor means is absorbed by a rear sound absorbing material provided on the inner surface of the intake duct far from the fan motor means so as to face the air intake port of the fan motor means. Furthermore, air flowing to the air intake port of the fan motor means in the intake duct is rectified by the rectifying sound-absorbing material that forms a fan-shaped rectifying passage when viewed from the front, thereby reducing ventilation resistance to the air intake port. it can. Further, since the noise of the fan motor means that is not absorbed by the sound absorbing material and leaks further upstream is absorbed by the rectifying sound absorbing material, it is possible to reduce the leakage of the noise to the outside. As a result, according to the present invention, it is possible to reduce leakage of noise generated from the fan motor means to the outside of the housing.

In the second invention of the present invention, preferably, the intake duct is formed so as to extend in the vertical direction, and an outlet of the intake duct is formed on a side of the upper end facing the air intake port of the fan motor means, and the rectifying sound absorbing material is An arc-shaped inner wall that surrounds the upper side of the vent hole of the front sound-absorbing material and two fan-shaped rectifying passages that extend from the circumferential ends of the arc-shaped inner wall toward the upstream side of the intake duct are formed. The arc-shaped inner wall and the two inner walls of the rectifying sound absorbing material rectify the air flowing from the upstream side of the intake duct to the outlet of the intake duct.
In the second invention of the present invention configured as described above, the rectifying and sound absorbing material forms a fan-shaped rectifying passage from the arc-shaped inner wall and the two inner walls, and the intake duct from the upstream side of the intake duct by this rectifying passage. Since the air flowing to the outlet of the air is rectified, the ventilation resistance to the air suction port can be reduced more effectively, and noise leaking upstream from the fan motor means leaks to the outside. Can be reduced.

  A third aspect of the present invention is a hand drying device that blows air on a user's hand to dry the housing, the housing having an opening recess that serves as a hand drying portion into which the user's hand is inserted, and the housing. Provided in the wall surface of the housing that forms the opening recess, and an air blowing portion that blows air to the hand-drying portion, a drive shaft, an air suction port for sucking air, and air blowing A fan motor means having an air outlet and an air intake duct extending from an air intake port to an air intake port of the fan motor means, and an outlet wall facing the air intake port of the fan motor means is formed on the outlet wall thereof The air intake duct, the air outlet duct extending from the air outlet of the fan motor means to the air outlet, and the sound absorbing material means disposed in a portion of the air intake duct adjacent to the air inlet of the fan motor means The sound-absorbing material means is provided on the inner surface of the intake duct near the fan motor means near the outlet of the intake duct and has a single vent hole for supplying air to the air intake port of the fan motor means. The front sound-absorbing material, the rear sound-absorbing material provided on the inner surface of the intake duct far from the fan motor means and facing the air suction port of the fan motor means, and the front sound-absorbing material and the rear sound-absorbing material And a rectifying sound absorbing material that rectifies the air in the intake duct, wherein the rectifying sound absorbing material is formed of an elongated plate that extends radially from the vent hole of the front sound absorbing material.

In the third invention of the present invention configured as described above, the fan motor means operates when a hand is placed in the opening recess of the housing. Next, air is taken into the intake duct from the air intake. The air in the intake duct passes through the rear sound absorbing material and flows into the vent holes of the front sound absorbing material. The air passes through the outlet of the intake duct and is sucked into the air suction port of the fan motor means. Further, the air is blown out from the air blowout port of the fan motor means to the blowout duct, and finally blown out from the air blowout portion to the inside of the opening recess.
Here, a part of the noise generated in the fan motor means and leaked upstream from the air suction port is caused by the front sound absorbing material provided on the inner surface of the intake duct near the fan motor means near the outlet of the intake duct. Absorbed. Further, the noise leaked upstream from the fan motor means is absorbed by a rear sound absorbing material provided on the inner surface of the intake duct far from the fan motor means so as to face the air intake port of the fan motor means. Furthermore, air flowing to the air suction port of the fan motor means in the intake duct is rectified by the rectifying sound absorbing material formed by the elongated plate material extending radially from the vent hole of the front sound absorbing material. Ventilation resistance can be reduced. Further, since the noise of the fan motor means that is not absorbed by the sound absorbing material and leaks further upstream is absorbed by the rectifying sound absorbing material, it is possible to reduce the leakage of the noise to the outside. As a result, according to the present invention, it is possible to reduce leakage of noise generated from the fan motor means to the outside of the housing.

  ADVANTAGE OF THE INVENTION According to this invention, the ventilation resistance to the suction inlet of a fan motor can be reduced, and it can reduce that the noise which generate | occur | produces from a fan motor leaks outside.

Hereinafter, an embodiment of a hand dryer according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view showing a hand dryer according to the first embodiment of the present invention, and FIGS. 2 and 3 are cross-sectional views taken along line AA of the hand dryer according to the first embodiment of the present invention shown in FIG. It is sectional drawing by each BB cross section.
4 is an enlarged partial sectional view of a part of the hand drying apparatus according to the first embodiment of the present invention shown in FIG. 2, and FIG. 5 is a hand according to the first embodiment of the present invention shown in FIG. It is the fragmentary sectional view which expanded a part of drying apparatus.
FIG. 6 is a cross-sectional view taken along the line C-C of the hand dryer according to the first embodiment of the present invention shown in FIG. 4, and FIG. 7 is a bottom view showing the hand dryer according to the first embodiment of the present invention. is there.
In addition, in FIGS. 1-6, the flow of the air inside the hand dryer at the time of a driving | operation is shown by the arrow.

As shown in FIGS. 1-7, the hand dryer 1 of this embodiment is provided with the housing 2 surrounding a hand dryer main body. An upper end opening recessed portion 4 having an upper end opened is provided on the upper portion of the housing 2 so that both hands arranged from above the housing 2 can be inserted.
This upper-end 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 upper end opening recess (hand drying portion) 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 surface 2b side of the housing 2. ing.

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, in the hand drying device 1 of the present embodiment, the hand is inserted into the upper end opening recess (hand drying portion) 4 from above the housing 2, and the palm side wall surface 4a and the back side of the upper end opening recess (hand drying portion) 4 are inserted. When the sensors 3a and 3b provided on the wall surface 4b detect the hand, a plurality of palm-side nozzles (second air blowing portions) 6a and an instep-side nozzle (first air) provided on the both wall surfaces 4a and 4b, respectively. Hot air is blown to the palm side and back side of the hand from the blowing part) 6b.

Further, in the housing 2, a palm side fan motor unit 8a and a back side fan motor unit 8b for supplying air to the palm side nozzle 6a and the back side nozzle 6b are provided adjacent to each other. .
Each fan motor unit 8a, 8b is arranged so 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. 2 and 3).
The palm-side fan motor unit 8a and the back-side fan motor unit 8b are of the same form having the same maximum output, and both of them can change the rotational speed of the rotary drive shafts 10a, 10b as desired. It has become.
Also, it is generally known that the palm side is more difficult to dry when it is dried with the same air volume on the back side of the hand and the palm side, compared to the air volume supplied to the back side of the hand. Need to be large. For this reason, 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 and supplied to the palm side. It is preferable to make the air volume to be made larger than the instep side.
Further, 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 rotational drive shaft 10a with respect to the upper side rotational drive shaft 10b. It is arranged obliquely upward and forward left with respect to the upper side fan motor unit 8b so as to be located obliquely upward to the left.

At the rear ends of the casings 12a and 12b of the fan motor units 8a and 8b, palm-side and instep-side air inlets 14a and 14b are respectively provided.
On the other hand, palm-side and upper-side air outlets 16a, 16b projecting upward are formed at the downstream ends of the outlet ducts 15a, 15b of the fan motor units 8a, 8b, respectively. The air outlets 16a and 16b are respectively provided with palm-side and instep-side fin heaters 18a and 18b. The fin heaters 18a and 18b warm the air blown from the air outlets 16a and 16b. It is supposed to be.

Further, a palm-side air outlet 16a is connected to the palm-side air outlet 16a, and the palm-side air outlet duct 30a is adjacent to the front surface 2a of the housing 2 and extends upward from the air outlet 16a. Is formed.
Further, the upper side air outlet 16b is connected to the upper side air outlet 30b in the same manner as the palm side air outlet 16a. The upper air outlet duct 30b extends almost directly above the upper air outlet 16b to a height position of the palm air inlet 14a of the palm fan motor unit 8a, and then the housing. 2 is formed so as to extend obliquely upward to the back surface 2b of 2 up to the height position of the bottom surface 4c of the upper-end opening concave portion (hand drying portion) 4 (see FIG. 3). After that, the blowout duct 30b extends upward so that the front side in the upper side blowout duct 30b forms the upper side wall surface 4b of the upper-end opening recess (hand drying portion) 4, and the upper front side in the duct 30b. A plurality of upper side nozzles 6b are arranged.

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 port 22 for taking air into the housing 2 is provided on the back side of the water receiving tray 19.
The air intake 22 has a lower air intake 22a for taking in air from below, and dust and the like are prevented from being taken into the inside from the lower air intake 22a on the lower air intake 22a. As a dustproof means, a substantially rectangular parallelepiped dustproof filter 20 is disposed.
The air intake port 22 further includes a front air intake port 22b formed between the front surface 20b of the dustproof filter 20 and the back surface 19a of the water receiving tray 19, and the bottom surface 20a and the front surface of the dustproof filter 20 are provided. 20b is exposed by the lower and front air intakes 22a and 22b (see FIGS. 4 and 5).
Here, the dustproof filter 20 is preferably made of a foam material having open cells such as foamed urethane and foamed polyethylene.

In addition, palm-side and upper-side intake ducts 24a and 24b are connected to the upper surface 20c of the dustproof filter 20, respectively.
The intake ducts 24a and 24b extend substantially straight upward from the upstream ends 26a and 26b disposed on the upper surface of the filter 20 along the back surface 2b of the housing 2, and the air suction ports at the downstream ends 27a and 27b. 14a and 14b.
The upper end portions of the intake ducts 24a and 24b are substantially equal to the height of the upper end portions of the fan motor units 8a and 8b, and are formed so as to cover the entire back surfaces of the fan motor units 8a and 8b.
During operation of the hand dryer 1, air outside the housing 2 is separately sucked into the intake ducts 24a and 24b from the lower and front air intake ports 22a and 22b through the dustproof filter 20. ing.

Further, outlets 29a and 29b of the intake ducts 24a and 24b communicating with the air intake ports 14a and 14b are formed at the downstream ends 27a and 27b of the intake ducts 24a and 24b adjacent to the air intake ports 14a and 14b, respectively. Intake duct outlet walls 31a and 31b are respectively provided.
The intake duct outlets 29a and 29b are positioned substantially coaxially with the air intake ports 14a and 14b, and the sizes of the intake duct outlets 29a and 29b are larger than the sizes of the air intake ports 14a and 14b. Is also getting bigger.
Anti-vibration rubbers 32a and 32b are disposed between the intake duct outlet walls 31a and 31b and the casings 12a and 12b of the fan motor units 8a and 8b, and the intake duct outlet walls 31a and 31b. Disc-shaped front sound-absorbing materials 28a and 28b are respectively arranged on the back side of the.
Here, each of the front sound absorbing materials 28a and 28b is preferably made of a foam material having open cells such as foamed urethane and foamed polyethylene.

Further, each front sound absorbing material 28a, 28b is provided with vent holes 34a, 34b at substantially the center thereof (substantially coaxial with each air suction port 14a, 14b), and each vent hole 34a, 34b is provided with each air suction port. 14a and 14b and the respective intake duct outlets 29a and 29b are located substantially on the same axis.
Further, the size of each of the air holes 34a, 34b is substantially equal to or slightly smaller than the size of each of the air suction ports 14a, 14b, and accordingly, the size of each of the intake duct outlets 29a, 29b. It is smaller than this.

Further, plate-like rear sound absorbing materials 36a and 36b are provided on the rear surfaces of the intake ducts 24a and 24b so as to be separated from the front sound absorbing materials 28a and 28b and to face the front sound absorbing materials 28a and 28b. They are arranged (see FIGS. 4 and 5).
Here, each of the rear sound absorbing materials 36a, 36b is preferably made of a foam material having open cells such as urethane foam and polyethylene foam.

Further, a palm-side rectified sound-absorbing material 38a is disposed at least partially between the palm-side front sound-absorbing material 28a and the palm-side rear sound-absorbing material 36a.
The palm-side rectifying sound-absorbing material 38a surrounds the upper side of the vent hole 34a of the palm-side front sound-absorbing material 28a and extends from the vent hole 34a to the palm-side intake duct 24a located obliquely below the front or A rectifying passage 40a having a substantially fan shape when viewed from the back is formed (see FIG. 6).
During operation of the palm-side fan motor unit 8a, the air taken into the palm-side intake duct 24a through the dust filter 20 from the lower and front air intake ports 22a and 22b passes through the rectifying passage 40a. The air is rectified and flows into the vent hole 34a of the front sound absorbing material 28a, and flows from the palm-side intake duct outlet 29a to the palm-side air inlet 14a.

Further, between the upper side front sound absorbing material 28b and the back side rear sound absorbing material 36b, more specifically, on the back side of the upper side front sound absorbing material 28b and above the upper side rear sound absorbing material 36b, A rectifying sound absorbing material 38b for the upper side is arranged. The upper side rectifying sound absorbing material 38b has a shape extending straight in the horizontal direction so that its lower edge is positioned slightly above the vent hole 34b of the front side sound absorbing material 28b. A rectifying passage 40b is formed from below the intake duct 24b to the vent hole 34b (see FIG. 6).
During the operation of the upper side fan motor unit 8b, the air taken into the upper side intake duct 24b through the dust filter 20 from the lower and front air intake ports 22a and 22b passes through the rectifying passage 40b. The air is rectified and flows into the vent hole 34b of the front sound-absorbing material 28b, and flows from the upper-side intake duct outlet 29b to the upper-side air inlet 14b.

Further, as described above, the palm side air intake port 14a is also disposed on the upper side air suction side in accordance with the arrangement of the palm side fan motor unit 8a obliquely in front left and upper direction with respect to the upper side fan motor unit 8b. The air passage distance of the palm-side intake duct 24a from the upstream end 26a of the palm-side intake duct 24a to the palm-side air intake port 14a is located on the upper left side of the mouth 14b. It is longer than the air path distance of the upper side intake duct 24b from the upstream end 26b of the duct 24b to the upper side air suction port 14b.
Further, since the palm-side air intake port 14a is positioned in front of the upper-side air intake port 14b, the depth dimension of the space in the palm-side intake duct 24a is the depth dimension of the upper-side intake duct 24b. The average cross-sectional area of the palm-side intake duct 24a is set larger than the average cross-sectional area of the upper-side intake duct 24b.

Next, the operation (operation) of the hand dryer 1 according to the first embodiment of the present invention described above will be described.
When a hand is inserted into the hand drying section 4 of the housing 2 of the hand drying device 1 from above, the sensors 3a and 3b detect the hand, and the palm side fan motor unit 8a and the back side fan motor unit 8b operate. At this time, the rotational drive shaft 10a of the palm-side fan motor unit 8a rotates at a higher speed than the rotational drive shaft 10b of the upper-side fan motor unit 8b.
By operating the fan motor units 8a and 8b, the palm side intake duct 24a and the instep side intake duct 24b are respectively passed through the dust filter 20 from the lower air intake port 22a and the front air intake port 22b of the housing 2. Air is taken in.
The air taken into the intake ducts 24a and 24b is rectified through the rectifying passages 40a and 40b, and flows into the vent holes 34a and 34b of the front sound absorbing materials. The air flows from the intake duct outlets 29a and 29b to the air suction ports 14a and 14b, and is sucked into the fan motor units 8a and 8b, respectively.

When air is sucked into the fan motor units 8a and 8b, vibration and noise are generated in the fan motor units 8a and 8b. First, the vibration is absorbed by the anti-vibration rubbers 32a and 32b.
On the other hand, the noise generated in each fan motor unit 8a, 8b and leaking from the air suction ports 14a, 14b to the intake duct side is partly smaller than the size of each intake duct outlet 29a, 29b. It is absorbed by the air holes 34a and 34b of the front sound absorbing materials 28a and 28b.
Further, the sound that is not absorbed by the air holes 34a and 34b of the front sound absorbing materials 28a and 28b is absorbed by the rectifying sound absorbing materials 38a and 38b and the rear sound absorbing materials 36a and 36b.

  The air of each fan motor unit 8a, 8b is heated by each fin heater 18a, 18b at each air outlet 16a, 16b and blown out to each outlet duct 30a, 30b. The air in each blowing duct 30a, 30b is sent to each nozzle 6a, 6b, and warm air is blown from the palm side nozzle 6a and the back side nozzle 6b to the palm and the back of the hand, respectively. At this time, the amount of air blown from the palm side nozzle 6a to the palm side of the hand is larger than the amount of air blown from the back side nozzle to the back of the hand.

FIG. 8 is a graph showing experimental results comparing the relationship between the sound pressure level and the frequency of noise generated during operation in the hand dryer 1 according to the first embodiment of the present invention for each installation condition of each sound absorbing material. is there.
Here, in this experiment, when none of the sound absorbing materials 28a, 28b, 36a, 36b, 38a, 38b are installed in the intake ducts 24a, 24b (condition 1), only the rear sound absorbing materials 36a, 36b are installed. (Condition 2), when the front sound absorbing materials 28a, 28b and the rear sound absorbing materials 36a, 36b are installed (Condition 3), when all the sound absorbing materials 28a, 28b, 36a, 36b, 38a, 38b are installed For the four installation conditions (Condition 4), the distance between the palm-side nozzle 6a and the back-side nozzle 6b is set to 85 mm, the wind speed at the palm-side nozzle 6a is about 96 m / s, The relationship between the sound pressure level and the frequency of noise generated when the wind speed was about 86 m / s was examined.

As shown in FIG. 8, in the case where no sound absorbing material is installed (condition 1), the sound pressure level at each frequency is the highest as compared with the other three cases, and in particular, the frequency peaks at around 3 kHz.
Next, in the case where only the rear sound absorbing materials 36a and 36b are installed (condition 2), the sound pressure level is slightly reduced as compared with condition 1. Further, although the sound pressure level peaks when the frequency is around 3 kHz, the peak value is only slightly reduced as compared with the peak value of Condition 1.
Further, when the front sound absorbing materials 28a and 28b and the rear sound absorbing materials 36a and 36b are respectively installed (condition 3), the sound pressure level is relatively reduced as compared with the condition 2. In particular, although the frequency slightly peaks at around 3 kHz, the peak value is significantly reduced compared to the peak value in condition 2.
From the results of the conditions 1 to 3, the sound absorbing effect of the front sound absorbing materials 28a and 28b and the rear sound absorbing materials 36a and 36b can be confirmed. In particular, by comparing the conditions 2 and 3, the front sound absorbing material 28a 28b has a greater sound absorption effect than the sound absorption effects of the rear sound absorbing materials 36a and 36b.
Further, when all the sound absorbing materials 28a, 28b, 36a, 36b, 38a, 38b are installed (condition 4), the sound pressure level is relatively further reduced as compared with condition 3. In particular, the tendency for the sound pressure level to decrease in the low frequency region is remarkable. This is due to the rectification effect (details will be described later) of the rectifying passages 40a and 40b of the rectifying and sound absorbing materials 38a and 38b. The ventilation resistance when sucked into the fan motor is reduced, and the rotational speed of the rotary drive shafts 10a, 10b of each fan motor unit 8a, 8b can be set small to obtain the same air volume, and each fan motor unit 8a, This is because the operation sound 8b has been silenced.

FIG. 9A shows that the hand dryer 1 provided with the rectifying and sound absorbing material 38a according to the first embodiment of the present invention is sucked into the palm-side air inlet 14a from the lower side in the palm-side intake duct 24a. It is a figure which shows the result of carrying out CAE analysis of the flow of the air to be expressed with a streamline.
FIG. 9B is a diagram showing, as streamlines, the results of CAE analysis of the flow of air sucked into the palm-side air suction port 14a when the rectifying and sound-absorbing material 38a is not provided in the palm-side intake duct 24a.
As shown in FIG. 9A, when the rectified sound absorbing material 38a is provided in the palm side intake duct 24a, the flow of air sucked into the palm side air intake port 14a from below in the palm side intake duct 24a is as follows. The rectifying passage 40a of the rectifying sound absorbing material 38a forms a laminar flow.
On the other hand, as shown in FIG. 9B, when the rectifying sound absorbing material 38a is not provided in the palm side intake duct 24a, turbulent flow is generated around the palm side air suction port 14a.
From these results, it can be seen that when the rectifying sound absorbing material 38a is provided, the air flow becomes smoother and the ventilation resistance in the intake duct 24a is remarkably reduced as compared with the case where the rectifying sound absorbing material 38a is not provided. .

According to the hand dryer 1 according to the first embodiment of the present invention described above, the air suction ports 14a and 14b, the intake duct outlets 29a and 29b, and the front sound absorbing materials 28a of the fan motor units 8a and 8b, respectively. 28b, the vent holes 34a, 34b are located substantially coaxially, and the sizes of the vent holes 34a, 34b are smaller than the sizes of the intake duct outlets 29a, 29b. For this reason, noise generated in each fan motor unit 8a, 8b and leaked upstream from each air suction port 14a, 14b and each intake duct outlet 29a, 29b is effectively absorbed by each front sound absorbing material 28a, 28b. Can be reduced.
Further, according to the hand drying device 1 according to the present embodiment, the rectifying sound absorbing materials 38a and 38b and the rear sound absorbing materials 36a and 36b are arranged on the upstream side of the front sound absorbing materials 28a and 28b, respectively. Noise that has not been absorbed by the front sound absorbing materials 28a and 28b but leaked to the upstream side can be effectively absorbed and reduced by the rectifying sound absorbing materials 38a and 38b and the rear sound absorbing materials 36a and 36b. The rear sound absorbing members 36a and 36b can reduce the reflected sound on the back surface in each of the intake ducts 24a and 24b.
Furthermore, according to the hand dryer 1 according to the present embodiment, the air taken into the intake ducts 24a and 24b from the lower air intake port 22a and the front air intake port 22b passes through the rectifying passages 40a and 40b. In the rectified state, the airflow resistance in each of the intake ducts 24a and 24b is reduced because the air flows into the ventilation holes 34a and 34b of each front sound absorbing material. As a result, the rotational speed of the rotational drive shafts 10a and 10b of the fan motor units 8a and 8b can be set small to obtain the same air volume, and the operating noise of the fan motor units 8a and 8b can be silenced. Can do.

Further, according to the hand dryer 1 according to the present embodiment, the palm-side fan motor unit 8a is disposed obliquely forward left above the upper-side fan motor unit 8b, so that the upstream side of the palm-side intake duct 24a. The air path distance of the palm-side intake duct 24a from the end 26a to the palm-side air intake port 14a is such that the upper-side intake duct 24b from the upstream end 26b of the upper-side intake duct 24b to the upper-side air intake port 14b. It is longer than the airway distance. As a result, compared with the case where the air path distance of the palm side intake duct 24a and the air path distance of the back side intake duct 24b are equal, the operating sound generated in the palm side fan motor unit 8a is generated by the palm side air intake port 14a. From the air intake port 22 through the palm-side intake duct 24a. Therefore, for example, the distance between the palm-side nozzle 6a and the back-side nozzle 6b is set to 85 mm, the wind speed at the palm-side nozzle 6a is about 96 m / s, and the wind speed at the back-side nozzle 6b is about 86 m / s. When the hand dryer 1 is operated, the operation sound can be reduced to about 63 db.
Furthermore, according to the hand drying device 1 according to the present embodiment, the palm side air motor 16a is disposed on the front left side obliquely upward with respect to the upper side fan motor unit 8b, so that the palm side air outlet 16a is provided. The air path distance in the palm-side outlet duct 30a is set short so as to be close to the palm-side nozzle 6a. As a result, even when the air volume to the palm-side nozzle 6a is increased, an increase in the wind path resistance in the palm-side outlet duct 30a is suppressed, and an increase in the required power of the palm-side fan motor unit 8a is reduced. Can do. Further, it is possible to suppress the operation sound generated in the palm-side fan motor unit 8a.
In addition, according to the hand drying device 1 according to the present embodiment, the palm side fan motor unit 8a is disposed in front of the upper side fan motor unit 8b, so that the palm side intake duct 24a has a depth dimension on the upper side. It is ensured to be larger than the depth dimension of the air intake duct 24b, and the average cross-sectional area of the palm-side intake duct 24a is set larger than the average cross-sectional area of the upper-side intake duct 24b. As a result, even when the air volume to the palm side nozzle 6a is increased, an increase in the wind path resistance in the palm side intake duct 24a is suppressed, and an increase in the required power of the palm side fan motor unit 8a is reduced. Can do. Further, it is possible to suppress the operation sound generated in the palm-side fan motor unit 8a.
Furthermore, according to the hand dryer 1 according to the present embodiment, since the bottom surface 20a and the front surface 20b of the dustproof filter 20 are exposed by the lower and front air intake ports 22a and 22b, the ventilation area of the dustproof filter 20 is increased. Can be set large. As a result, the ventilation resistance in the dustproof filter 20 can be reduced, and the rotational speeds of the rotational drive shafts 10a and 10b of the fan motor units 8a and 8b can be set small to obtain the same air volume. The operation sound of the fan motor units 8a and 8b can be silenced.

Next, FIG. 10 is a cross-sectional view similar to FIG. 6 showing a hand dryer according to a first modification of the second embodiment of the present invention. Here, in FIG. 10, the same parts as those shown in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.
As shown in FIG. 10, in the hand dryer 50A according to the first modification of the second embodiment of the present invention, the palm-side front sound absorbing material 28a in the hand dryer 1 of the first embodiment of the present invention described above and Instead of the palm-side rectified sound-absorbing material 38a between the palm-side rear sound-absorbing material 36a, an elongated plate-shaped rectified sound-absorbing material 52a is disposed.
The rectifying sound-absorbing material 52a is arranged so as to extend radially downward from the palm-side air vent 34a in the palm-side intake duct 24a. Further, the upper end surface 54a of the rectifying sound absorbing material 52a is substantially flush with the lower inner peripheral surface of the palm side vent hole 34a, and the lower end surface 56a of the rectifying sound absorbing material 52a is the palm side front sound absorbing material 28a. It is almost flush with the lower outer peripheral surface of.

  In the hand dryer 50A according to the second embodiment of the present invention described above, the air taken into the palm side intake duct 24a from the lower air inlet 22a and the front air inlet 22b is converted into the palm side rectified sound absorbing material 52a. Is passed through both sides and flows into the vent hole 34a of the palm-side front sound-absorbing material 28a. As a result, the ventilation resistance of the palm-side intake duct 24a is reduced, and the rotational speed of the rotational drive shaft 10a of the palm-side fan motor unit 8a can be set small to obtain the same air volume. The operation sound of the motor unit 8a can be silenced.

Next, FIG. 11 is sectional drawing similar to FIG.6 and FIG.10 which shows the hand-drying apparatus by the modification of 2nd Embodiment of this invention. Here, in FIG. 11, the same parts as those shown in FIGS. 6 and 10 are denoted by the same reference numerals, and description thereof will be omitted.
As shown in FIG. 11, in the hand dryer 50B according to the modification of the second embodiment of the present invention, the rectified sound absorbing material 52b having the same shape as that of the second embodiment described above is placed in the palm-side intake duct 24a. It arrange | positions so that it may extend radially upwards from the palm side vent hole 34a on the back surface of the side front sound-absorbing material 28a.
This rectifying sound absorbing material 52b is formed by extending the elongated plate-like rectifying sound absorbing material 52a of the hand dryer 50A according to the second embodiment described above around the central axis of the vent hole 34a along the back surface of the palm-side front sound absorbing material 28a. It is in the form of being rotated 180 °. Further, the upper end surface 54b of the rectifying sound absorbing material 52a is substantially flush with the upper outer peripheral surface of the palm side front sound absorbing material 28a, and the lower end surface 56b of the rectifying sound absorbing material 52b is the same as the palm side vent hole 34a. It is almost flush with the upper inner peripheral surface.

  In the hand dryer 50B according to the modified example of the second embodiment of the present invention described above, the palm-side intake duct 24a is moved from the lower air intake port 22a and the front air intake port 22b to the palm side intake duct 24a, as in the second embodiment described above. The taken-in air is rectified by the rectifying sound absorbing material 52b and flows into the vent hole 34a of the palm-side front sound absorbing material 28a. As a result, the ventilation resistance of the palm-side intake duct 24a is reduced, and the rotational speed of the rotational drive shaft 10a of the palm-side fan motor unit 8a can be set small to obtain the same air volume. The operation sound of the motor unit 8a can be silenced.

  In the hand drying device according to the first and second embodiments of the present invention described above, a description has been given of a mode in which two fan motor units for the palm side and the back side are provided in the housing. However, the present invention is not limited to this form, and one fan motor unit can be applied.

It is a front view which shows the hand dryer by 1st Embodiment of this invention. It is AA sectional drawing of the hand-drying apparatus by 1st Embodiment of this invention shown in FIG. It is BB sectional drawing of the hand-drying apparatus by 1st Embodiment of this invention shown in FIG. It is the elements on larger scale which expanded a part of hand dryer by 1st Embodiment of this invention shown in FIG. It is the elements on larger scale which expanded a part of hand-drying apparatus by 1st Embodiment of this invention shown in FIG. It is CC sectional drawing of the hand-drying apparatus by 1st Embodiment of this invention shown in FIG. It is a bottom view which shows the hand dryer by 1st Embodiment of this invention. In the hand dryer by 1st Embodiment of this invention, it is a graph which shows the experimental result compared with the installation conditions of each sound-absorbing material about the relationship between the sound pressure level and frequency of the noise which generate | occur | produces during operation | movement. FIG. 9 (a) shows the result of CAE analysis of the flow of air sucked into the palm side air intake port from below in the palm side intake duct during the operation of the hand dryer according to the first embodiment of the present invention. FIG. 9 (b) shows the result of CAE analysis of the air flow sucked into the palm side air inlet when no rectifying sound absorbing material is provided in the palm side intake duct. FIG. It is sectional drawing similar to FIG. 6 which shows the hand-drying apparatus by 2nd Embodiment of this invention. It is sectional drawing similar to FIG.6 and FIG.10 which shows the hand-drying apparatus by the modification of 2nd Embodiment of this invention.

Explanation of symbols

1, 50A, 50B Hand dryer 2 Housing 3a, 3b Sensor 4 Hand dryer 6a Palm-side nozzle 6b Back-side nozzle 8a Palm-side fan motor unit 8b Back-side fan motor unit 10a Palm-side fan motor unit Rotation drive shaft 10b Rotation drive shaft of back side fan motor unit 12a Casing of fan motor unit for palm side 12b Casing of fan motor unit for back side 14a Palm side air suction port 14b Back side air suction port 15a For palm side Fan motor unit outlet duct 15b Upper side fan motor unit outlet duct 16a Palm side air outlet 16b Upper side air outlet 18a Palm side fin heater 18b Upper side fin heater 19 Water receiving tray 20 Dustproof filter 22a Lower air intake 22b Front air intake 4a 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 27a Downstream end of the palm-side intake duct 27b Downstream end of the back-side intake duct 28a Palm Side front sound-absorbing material 28b Back-side front sound-absorbing material 29a Palm-side intake duct outlet 29b Back-side intake duct outlet 30a Palm-side outlet duct 30b Upper-side outlet duct 31a Palm-side inlet duct outlet wall 31b Upper Side intake duct outlet wall 32a Palm side vibration isolating rubber 32b Back side vibration isolating rubber 34a Palm side vent hole 34b Back vent hole 36a Palm side rear sound absorbing material 36b Back side sound absorbing material 38a, 52a, 52b Rectification sound absorption material for palm side 38b Rectification sound absorption material for back side 40a Rectification passage for palm side 40b Rectification passage for back side

Claims (6)

A hand drying device that blows air on a user's hand to dry it,
A housing in which an opening recess serving as a hand drying section into which a user's hand is inserted is formed;
An air intake provided in the housing;
An air blowing part that is provided on the wall surface of the housing forming the opening recess and blows air to the hand drying part;
Fan motor means provided in the housing, provided with a drive shaft, an air inlet for sucking air, and an air outlet for blowing air;
An air intake duct extending from the air intake port to the air intake port of the fan motor means, the air outlet duct having an outlet facing the air intake port of the fan motor means on the outlet wall;
A blowing duct extending from the air blowing port of the fan motor means to the air blowing portion;
A sound-absorbing material means disposed at a site adjacent to the air inlet of the fan motor means of the intake duct,
The sound absorbing material means is provided on the inner surface of the air intake duct near the fan motor means near the outlet of the air intake duct, and a single ventilation hole for supplying air to the air intake port of the fan motor means is formed. Including a front sound-absorbing material, and a rear sound-absorbing material provided on the inner surface of the intake duct far from the fan motor means so as to face the air suction port of the fan motor means,
The front sound-absorbing material has a smaller diameter than the outlet of the intake duct so that the surface of the front sound-absorbing material facing the fan motor means faces the suction port of the fan motor means. A hand dryer characterized in that it is configured.   The hand-drying device according to claim 1, wherein the front sound-absorbing material has a vent hole having a diameter substantially the same as that of the air suction port of the fan motor means.   The hand-drying device according to claim 1, wherein the sound-absorbing material means further includes a rectifying sound-absorbing material that is disposed between the front sound-absorbing material and the rear sound-absorbing material and rectifies air in the intake duct. A hand drying device that blows air on a user's hand to dry it,
A housing in which an opening recess serving as a hand drying section into which a user's hand is inserted is formed;
An air intake provided in the housing;
An air blowing part that is provided on the wall surface of the housing forming the opening recess and blows air to the hand drying part;
Fan motor means provided in the housing, provided with a drive shaft, an air inlet for sucking air, and an air outlet for blowing air;
An air intake duct extending from the air intake port to the air intake port of the fan motor means, the air outlet duct having an outlet facing the air intake port of the fan motor means on the outlet wall;
A blowing duct extending from the air blowing port of the fan motor means to the air blowing portion;
A sound-absorbing material means disposed at a site adjacent to the air inlet of the fan motor means of the intake duct,
The sound absorbing material means is provided on the inner surface of the air intake duct near the fan motor means near the outlet of the air intake duct, and a single ventilation hole for supplying air to the air intake port of the fan motor means is formed. A front sound-absorbing material, a rear sound-absorbing material provided on the inner surface of the intake duct far from the fan motor means so as to oppose the air inlet of the fan motor means, and the front sound-absorbing material and the rear sound-absorbing material Including a rectifying and sound-absorbing material that is disposed between and rectifies the air in the intake duct,
The rectifying sound-absorbing material is configured so as to form a fan-shaped rectifying passage in front view communicating with the vent hole by surrounding the upper side of the vent hole of the front sound-absorbing material. apparatus. The intake duct is formed so as to extend in the vertical direction, and an outlet of the intake duct is formed on a side of the upper end facing the air intake port of the fan motor means, and the rectifying sound absorbing material is formed of the front sound absorbing material. The fan-shaped rectifying passage is formed from an arc-shaped inner wall that surrounds the upper side of the vent hole and two inner walls that extend from the circumferential ends of the arc-shaped inner wall toward the upstream side of the intake duct. The hand dryer according to claim 4, wherein the arc-shaped inner wall and the two inner walls of the material rectify air flowing from the upstream side of the intake duct to the outlet of the intake duct. A hand drying device that blows air on a user's hand to dry it,
A housing in which an opening recess serving as a hand drying section into which a user's hand is inserted is formed;
An air intake provided in the housing;
An air blowing part that is provided on the wall surface of the housing forming the opening recess and blows air to the hand drying part;
Fan motor means provided in the housing, provided with a drive shaft, an air inlet for sucking air, and an air outlet for blowing air;
An air intake duct extending from the air intake port to the air intake port of the fan motor means, the air outlet duct having an outlet facing the air intake port of the fan motor means on the outlet wall;
A blowing duct extending from the air blowing port of the fan motor means to the air blowing portion;
A sound-absorbing material means disposed at a site adjacent to the air inlet of the fan motor means of the intake duct,
The sound absorbing material means is provided on the inner surface of the air intake duct near the fan motor means near the outlet of the air intake duct, and a single ventilation hole for supplying air to the air intake port of the fan motor means is formed. A front sound-absorbing material, a rear sound-absorbing material provided on the inner surface of the intake duct far from the fan motor means so as to oppose the air inlet of the fan motor means, and the front sound-absorbing material and the rear sound-absorbing material Including a rectifying and sound-absorbing material that is disposed between and rectifies the air in the intake duct,
The hand-dried device, wherein the rectifying sound-absorbing material is formed of an elongated plate member that extends radially from the vent hole of the front sound-absorbing material.

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