JP6657577B2 - Hand drying equipment - Google Patents

Description

  The present invention relates to a hand drying device that is disposed in, for example, a washroom, a toilet, or the like, and that blows airflow from a nozzle hole to dry wet hands.

  In general, a hand dryer that blows air through nozzle holes to dry hands has lower running costs compared to paper towels, rental towels, etc., and is non-contact and hygienic, making it easier to maintain. There are features such as excellent. In the prior art, as such a hand drying device, for example, a device described in Patent Document 1 is known. This hand drying device is provided with a hand insertion portion, a blowing means, and the like, and detects that a hand has been inserted into the hand insertion portion and activates the blowing device, thereby providing an air outlet (corresponding to a nozzle hole described later). A high velocity air stream is blown out from the to dry the wet hand surface.

  In the above conventional technique, the hand insertion portion, which is a hand insertion space, includes a back wall, an upper surface wall having a nozzle hole formed therein, and a water receiving portion disposed below the nozzle hole to receive water droplets. The water receiving portion is formed with a drain hole for draining water drops that fall from wet hands and accumulate in the water receiving portion. If there is no drain port around the hand dryer, a water receiving cup may be disposed below the water receiving portion, and when the water receiving cup becomes full, the water receiving cup is removed and drained.

  As another conventional technique, for example, a hand drying apparatus described in Patent Document 2 is known. In this hand drying device, the front wall and the back wall of the hand insertion portion are erected on the bottom wall in a state where they face each other, and an opening is formed on the upper surface of the main body (housing) to be connected to the front wall and the back wall. . The front wall and the rear wall are each provided with a nozzle hole for blowing an air flow.

Japanese Patent No. 3821520 Japanese Patent No. 5093763

  However, according to the related art described in Patent Document 1 described above, a driving vibration sound of the blowing means, a blade passing sound, and the like are generated during operation of the hand dryer. In addition, the high-speed airflow blown out from the nozzle holes generates turbulent noise due to the disturbance of the flow. When these sounds enter the inside of the water receiving portion and the water receiving cup through the drain hole, there is a problem that the entered sounds resonate inside and the noise is amplified.

  Further, in the related art described in Patent Literature 2, since the front wall and the back wall of the hand insertion portion face each other, a resonance space in which both wall surfaces become antinodes when sound is reflected is easily formed. As a result, there is a problem in that the above-described driving vibration sound, blade passing sound, turbulent flow sound, and the like resonate between the front wall and the back wall, so that noise is amplified at the hand insertion portion. In particular, when the wind direction restricting means is disposed on the wall surface of the hand insertion portion, the above problem becomes remarkable since the air flow is turbulent due to the forced change of the wind direction and turbulent sound is likely to increase. .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hand drying device capable of reducing noise during operation.

The hand drying device according to the present invention is provided with a blowing device capable of blowing air, a hand insertion portion into which a user can insert a hand, and a wall provided on the hand insertion portion, and the air blown by the blowing device is used for the hand insertion portion. A nozzle hole that blows out toward the inside of the hand, a water receiving portion that is arranged at the bottom of the hand insertion portion and receives water scattered from the hand, and a drain port that is provided in the water receiving portion and drains water from the water receiving portion. A water receiving cup which is detachably provided below the drain port and stores water flowing out from the water receiving section through the drain port; and a first water receiving section which is provided in the water receiving section and suppresses sound when the blower is operated . comprising a silencer mechanism, the first silencing mechanism is integrally formed in the middle of the drain outlet, the cross-sectional area of the passage at an intermediate portion of the passage constituting the discharge port is formed by increasing partially I have.
Alternatively, the hand drying device according to the present invention is provided with a blowing device capable of blowing air, a hand insertion portion into which a user can insert a hand, and a wall provided on the hand insertion portion for manually blowing air blown by the blowing device. A nozzle hole that blows out toward the inside of the insertion part, a water receiving part that is located at the bottom of the hand insertion part and receives water scattered from the hand, and a drain that is provided in the water receiving part and drains water from the water receiving part A mouth, a water receiving cup which is detachably provided below the drain port and stores water flowing out from the water receiving part through the drain port, and a water receiving part, which suppresses sound when the blowing means is operated. A water collection cup that directly collects water flowing from a drain port, and a projection-shaped partition that separates the water collection section from other parts in the water reception cup. The silencing mechanism is provided in the water receiving cup via a partition It is arranged on isolated sites.

  According to the present invention, since the water receiving portion is provided with the sound deadening mechanism, even when the resonance frequency of the water receiving portion matches the frequency of the sound wave, the sound deadening mechanism can attenuate the sound wave. Accordingly, noise during operation can be suppressed, and a low-noise hand drying device can be realized.

It is a perspective view showing the appearance of a hand drying device by Embodiment 1 of the present invention. It is a longitudinal cross-sectional view of the hand dryer shown in FIG. FIG. 3 is a cross-sectional view of the hand drying device in FIG. It is the longitudinal cross-sectional view which looked at the front barrier wall part from the arrow AA direction in FIG. It is the longitudinal cross-sectional view which looked at the left side wall protection part from the arrow BB direction in FIG. FIG. 3 is an enlarged sectional view of a main part in FIG. 2, showing a lower side of the hand drying device in an enlarged manner. FIG. 4 is a characteristic diagram showing a driving sound of the hand drying device according to the first embodiment of the present invention. It is a longitudinal section showing the hand drying device by Embodiment 2 of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each of the drawings used in this specification, the same reference numerals are given to common elements, and redundant description will be omitted. Further, the present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention. Further, the present invention includes all combinations of configurations that can be combined among the configurations described in the following embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing the appearance of a hand drying device according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view of the hand drying device. As shown in these drawings, the hand drying device includes a casing 1, a hand insertion unit 3, a water receiving unit 4, a drain container 7, a high-pressure air flow generator 9, a nozzle hole 12, a sound deadening mechanism 60, and the like. The casing 1 constitutes an outer shell of the hand dryer, and is formed, for example, in an elongated rectangular shape extending vertically. On the lower front surface of the casing 1, for example, a square-shaped hand insertion opening 2 is opened.

  The hand insertion portion 3 is formed as a substantially rectangular concave portion that is recessed from the front surface to the rear surface of the casing 1, and the inside of the hand insertion portion 3 is provided with a space into which a user inserts a hand when using a hand drying device. Has become. The hand insertion portion 3 is opened through the hand insertion opening 2 on the front surface of the lower portion of the casing 1 and on both left and right sides. The inner wall surface of the hand insertion portion 3 is impregnated with a water-repellent coating such as a silicon-based or fluorine-based coating, a hydrophilic coating such as a titanium oxide, or an antibacterial agent. Thereby, dirt adhering to the inner wall surface of the hand insertion portion 3 can be reduced, and propagation of bacteria on the inner wall surface can be suppressed.

  The water receiving part 4 is a part for receiving water scattered from the hand inserted into the hand insertion part 3. The water receiving portion 4 is formed as a sink-shaped concave portion that opens upward, and is disposed at the bottom of the hand insertion portion 3. In addition, on the bottom surface of the water receiving portion 4, a protruding ridge portion is provided at a middle portion in the left-right direction and extends in the front-rear direction. Are formed. These concave portions are inclined obliquely downward from the rear side of the water receiving portion 4 toward the front side, and the front end portion, which is the lowest portion of each concave portion, is provided with a drain passage 6 as a drain port. ing.

  The drain passage 6 is a passage for draining water collected in the water receiving portion 4 and extends in the up-down direction. One end of the drain passage 6 opens to the bottom surface of the water receiving portion 4, and the other end of the drain passage 6 opens to the lower surface of the casing 1. The drain container 7 is a water receiving cup for storing water flowing out from the water receiving portion 4 through the drain passage 6, and is formed of, for example, a flat container whose upper side is open. The drain container 7 is detachably attached to the lower surface of the water receiving portion 4 at a position below the drain passage 6.

  On the other hand, as shown in FIG. 2, a nozzle hole 12 for blowing out a high-speed airflow toward the inside of the hand insertion portion 3 and a deeper side of the nozzle hole 12 are provided on the upper surface of the hand insertion portion 3. A hand detection sensor 14 that detects the presence or absence of a hand, and a turning wall 40 that is located at the back of the hand detection sensor 14 and protrudes downward from the upper surface of the hand insertion unit 3 are provided. The nozzle hole 12 is formed as a slit-shaped opening extending in the left-right direction when viewed from the front of the hand dryer.

  Thereby, the nozzle hole 12 blows out the air blown from the high-pressure air flow generation device 9 described later from the elongated slit-shaped opening, so that the high-speed air flow arranged so as to cover the hand insertion port 2 as viewed from the front is formed. Form an air curtain. On the other hand, the turning wall 40 protrudes inward from the upper surface of the hand insertion portion, and has, for example, a curved shape so as to surround the hand detection sensor 14. The swirling wall 40 straightens the air flow that is swirled inside the hand insertion portion 3 after being blown out from the nozzle hole 12, and guides the air flow to the side. Thereby, the swirling wall 40 reduces the collision of the air flow swirling inside the hand insertion portion 3 with the air flow newly blowing from the nozzle hole 12 at a steep angle, and suppresses the turbulent sound due to the collision of the air flow. can do.

  The upper rear side of the casing 1 is covered with a base 8. In a space formed between the casing 1 and the base 8, a high-pressure airflow generating device 9 as a blower is disposed. The high-pressure airflow generator 9 includes, for example, a DC brushless motor (which may be a commutator motor or an induction motor) and a turbo fan driven by the motor. The high-pressure airflow generator 9 generates a high-speed airflow for blowing out from the nozzle holes 12. Further, inside the space, an internal intake passage 11 that connects an internal intake port 10 provided on the front of the casing 1 and an intake side of the high-pressure airflow generating device 9, and an outlet side of the high-pressure airflow generating device 9 are provided. An outlet passage 13 that connects to the nozzle 12 hole, and a heater 15 that heats air in the middle of the outlet passage 13 are arranged.

  FIG. 3 is a cross-sectional view in which the hand dryer in FIG. 2 is broken at the position of the high-pressure air flow generator. As shown in this figure, the left and right side surfaces of the casing 1 are provided with inclined portions 17 which are rounded and inclined from the side surface to the front. A detachable cover 16 is provided on the front surface of the casing 1. When the cover 16 is attached to the casing 1, a gap is formed between the left and right ends of the cover 16 and the inclined portion 17, and the gap forms an external air inlet 18 for sucking outside air. Further, an external intake passage 19 is formed between the front surface of the casing 1 and the cover 16, and a filter 20 for purifying air is disposed at the center of the front surface of the casing 1. The external intake passage 19 guides air sucked from the external intake port 18 to the filter 20.

(Structure of water receiver)
Next, a detailed configuration of the water receiver 4 will be described with reference to FIGS. 1, 4, and 5. FIG. 4 is a vertical sectional view taken along the line AA in FIG. 1 showing the front barrier, and FIG. 5 is a vertical sectional view taken along the line BB in FIG. 1 showing the left side wall. As shown in FIG. 1, the peripheral wall portion of the water receiving portion 4 formed in a sink shape is constituted by a front barrier wall portion 50 and left and right side wall barrier portions 51. The front barrier 50 is erected upward from the periphery of the bottom surface of the water receiver 4 below the hand insertion slot 2. Each side wall part 51 is provided on the left and right sides of the front wall part 50 so as to stand upward from the periphery of the bottom surface of the water receiving part 4. These barrier portions 50 and 51 are arranged in a substantially U-shape so as to surround the bottom surface of the water receiving portion 4 from the front side and both right and left sides.

  The rear part of each side wall part 51 is elongated to the upper side along the rear part of the casing 1 and forms left and right side parts of the hand insertion part 3. Thus, the barriers 50 and 51 prevent water droplets scattered from the user's hand in the hand insertion unit 3 from jumping to the outside of the hand insertion unit 3. In this specification, the front barrier 50 and the left and right side barriers 51 may be collectively referred to as “barriers 50 and 51”.

  On the other hand, as shown in FIG. 4, a portion extending from the inner wall surface of the front barrier 50 to the top surface has, for example, a plurality of curved surfaces 50a, 50b, 50c having a continuous shape, and a smooth curved surface having no flat surface. It is formed as a surface. These curved surface portions 50a to 50c are inclined with respect to the upper surface portion of the hand insertion portion 3 in which the nozzle holes 12 are arranged, and are held in a positional relationship (non-parallel state) that is not parallel to the upper surface portion. . Also, as shown in FIG. 5, a portion extending from the inner wall surface of the side wall protection portion 51 to the top surface has a plurality of curved surface portions 51a, 51b, 51c in a continuous shape, and has a smooth curved surface having no flat surface. It is formed as. These curved portions 51 a to 51 c are held in a non-parallel state with respect to the upper surface of the hand insertion portion 3. Thus, the barrier parts 50 and 51 exhibit a sound deadening effect as described below, and are smoothly curved to improve the aesthetic appearance of the hand dryer.

  In addition, the upper surface, the rear surface, and the side surface constituting the inner wall of the hand insertion portion 3, the front surface, the rear surface, and the side surface constituting the inner wall surface of the water receiving portion 4, the respective barrier walls 50, 51, The plurality of wall portions including the curved portions 50a to 50c and 51a to 51c are configured such that all the wall portions are in a non-parallel state to each other (that is, such that there are no parallel wall portions). . In particular, the left and right side wall protection portions 51 are disposed in a state of being expanded in a substantially “C” shape, for example, toward the front of the hand dryer.

  According to the above-described configuration, it is possible to prevent the generation of a constant wave of sound between two wall portions facing each other in a parallel state. Accordingly, even when the high-speed airflow blown out from the nozzle hole 12 generates turbulent noise, or when the driving vibration noise of the high-pressure airflow generator 9 is transmitted to the internal space of the hand insertion portion 3, the hand insertion portion 3 It is possible to suppress the occurrence of the sound resonance phenomenon in the internal space. In particular, at the positions of the front barrier 50 and the side barrier 51, a sound wave diffraction phenomenon occurs depending on their shapes, and the diffraction location may be a secondary sound source. According to the above configuration, since no parallel wall surface is formed, the diffraction phenomenon of the sound wave can be suppressed.

(Silencer)
Next, the sound deadening mechanism of the hand dryer will be described with reference to FIG. FIG. 6 is an enlarged sectional view of a main part in FIG. 2 showing an enlarged lower part of the hand dryer. As shown in this figure, a silencing mechanism 60 is provided on the wall surface of the water receiving section 4. The muffling mechanism 60 is a mechanism for attenuating (muting) sound waves generated or echoed inside the hand insertion portion 3, and is provided at one or more appropriate portions of the water receiving portion 4 and the drain container 7. I have. In the present invention, the number of muffling mechanisms 60 can be freely set as needed. FIG. 6 exemplifies a case where three muffling mechanisms 60a, 60b, and 60c are provided. I have.

  It is preferable that the first silencing mechanism 60 a be disposed on the wall surface of the water receiving section 4 and in a space that communicates with the drain container 7. As a specific example, the muffling mechanism 60a in FIG. 6 is located below (on the back side of) the bottom surface of the water receiving portion 4 where the airflow blown from the nozzle hole 12 collides, and communicates with the inside of the drain container 7. It is installed at a certain position. The silencing mechanism 60a is formed of, for example, a Helmholtz resonator, and is formed of a box or a container having one opening. Since the Helmholtz resonator has a simple structure, at least a part of the silencing mechanism 60a may be formed integrally with the water receiver 4.

  The specifications of the silencing mechanism 60a are preset in accordance with the frequency of the sound wave to be attenuated (in the present embodiment, the driving fluid sound of the high-pressure airflow generating device 9, the turbulent sound of the blown airflow, and the like). . The specification means the size, shape and volume of the box constituting the sound deadening mechanism 60a, or the opening diameter of the opening, the neck length, and the like. Further, as the silencing mechanism 60a of the present invention, for example, an extended silencing mechanism capable of attenuating not only a specific frequency but also a sound wave of a broadband frequency may be employed.

  The second muffling mechanism 60 b is formed of, for example, an expansion-type muffling mechanism, and is integrally formed in the drainage passage 6. More specifically, the silencing mechanism 60b is formed by partially enlarging the cross-sectional area of the drain passage 6 in a part of the length direction (water flow direction) of the drain passage 6. According to this configuration, the extended silencing mechanism 60b can be compactly incorporated by utilizing the structure of the drain passage 6 without securing a large space for disposing the silencing mechanism. Note that the silencer 60b of the present invention is not limited to the extended silencer, but may employ, for example, an interference silencer.

  The third silencing mechanism 60c is formed of, for example, a Helmholtz resonator, and is disposed on the bottom inside the drain container 7. More specifically, as shown in FIG. 6, the drain container 7 includes a water collecting portion 7a for directly collecting water flowing from the drain passage 6, and a projection for separating the water collecting portion 7a from other parts. And a shape-like partition 7b. The muffling mechanism 60c is arranged in the drain container 7 at a location isolated from the water collecting unit 7a via the partition 7b. In the present invention, the silencing mechanism 60c may also be configured by an extended silencing mechanism. Although not shown, in the present invention, for example, the partition 7b may be configured by a part of the muffling mechanism 60c. In this case, the drain container 7 can be formed more compactly at lower cost while achieving the noise reduction effect of the noise reduction mechanism 60c.

  Further, by forming at least a part of the silencing mechanism 60a, 60b, 60c integrally with the water receiving portion 4 or the drain container 7, the number of parts of the hand dryer having the silencing function can be reduced and the structure can be simplified. It is possible to promote cost increase and efficiency of the manufacturing process. In particular, in the present embodiment, the silencing mechanisms 60a and 60c composed of, for example, Helmholtz resonators, and the extended silencing mechanism 60b are formed integrally with the water receiver 4 or the drain container 7. Thereby, the plurality of noise reduction mechanisms 60a, 60b, 60c can be efficiently arranged by utilizing a small space of the water receiving portion 4, the drain passage 6, and the drain container 7. Therefore, a high soundproofing effect can be obtained without increasing the size of each part of the hand dryer.

  Further, in the present embodiment, the water receiving portion 4 may be formed using a material such as a carbon filler-filled resin or a foamed metal having a higher vibration damping performance than a normal molding material. In particular, at a portion where the high-speed airflow blown from the nozzle hole 12 collides, the density of the material may be increased. Thereby, the sound wave can be attenuated using the material constituting the water receiving portion 4, and the soundproofing performance of the hand dryer can be further improved.

(Operation of hand dryer)
Next, the operation of the hand dryer will be described. The hand drying device is equipped with a control circuit (not shown) for detecting a hand by the hand detection sensor 14 and operating the high-pressure air flow generator 9. When the user opens the cover 16 and turns on the power switch of the hand dryer, the control circuit operates and the hand dryer becomes operable. In this state, when the user inserts his / her wet hand from the hand insertion port 2 to the vicinity of the wrist into the hand insertion section 3, the hand detection sensor 14 detects the hand insertion, and the control circuit drives the high-pressure airflow generator 9. Is done. As a result, air is sucked from the external air intake port 18 of the casing 1, and this air is sucked into the high-pressure air flow generator 9 via the external air intake passage 19, the filter 20, and the internal air intake passage 11 sequentially. At this time, dust and the like in the air are removed by the filter 20.

  The high-pressure air flow generation device 9 generates a high-pressure air flow by pressurizing the sucked air, and sends this air flow from the blowing passage 13 to the nozzle hole 12. The blown air flow becomes a high-speed air flow due to the throttle effect of the nozzle hole 12 and blows out from the nozzle hole 12 into the inside of the hand insertion portion 3. At this time, the air flow blown out from the nozzle holes 12 is an air curtain-shaped air flow extending in the left-right direction when viewed from the front side of the hand dryer. As described above, when the hand dryer is in operation, a wide air curtain is formed by the high-speed air flow, so that the user can blow off water droplets attached to the hand by the air flow and dry the hand. When the heater switch is turned on, warm air heated by the heater 15 blows out from the nozzle holes 12, so that hands can be dried with high-speed warm air in winter or the like. When the user finishes drying the hand and pulls out the hand, this operation is detected by the hand detection sensor 14, and the operation of the high-pressure air flow generator 9 and the blowing of the air flow are stopped.

  When the above-described hand drying operation is performed, the water droplets blown off from the hand adhere to the respective parts of the hand insertion part 3 and the water receiving part 4 centering directly below the nozzle hole 12. A relatively large one of these water droplets flows down to the water receiving portion 4 by its own weight, and gathers around the drain passage 6 on the water receiving portion 4 in the forwardly inclined state. The water accumulated on the water receiving portion 4 is stored in the drain container 7 through the drain passage 6. On the other hand, when the airflow in the form of an air curtain blown downward from the nozzle hole 12 collides with the water receiving portion 4, the airflow is split into an airflow directed toward the front of the hand dryer and an airflow directed toward the rear. The airflow flowing forward crosses the front barrier 50 and flows out of the hand insertion portion 3. The airflow heading rearward reaches the rear surface of the turning wall 40 by vertically turning along the rear surface and the upper surface of the hand insertion portion 3, and is divided into the left and right sides by the turning wall 40. A part of the split airflow flows out of the hand insertion portion 3 through the side wall 51 together with the airflow directly flowing to the side after the collision with the water receiving portion 4. The remainder of the divided airflows gently merges with the airflow newly blown out from the nozzle holes 12 near the left and right side wall parts 51 and flows downward again.

(Air inflow to drain container)
A part of the high-speed airflow blown out from the nozzle hole 12 flows into the drain container 7 from the drain passage 6 together with water droplets when reaching a bottom surface of the water receiver 4. The air flow includes a driving fluid sound generated by the high-pressure air flow generator 9, a turbulent sound caused by a vortex generated when air is blown off from the nozzle hole 12, and a high-speed air flow. And sound waves such as a driving vibration sound transmitted from the high-pressure air flow generator 9 to the water receiving portion via the casing 1. These sound waves also enter the drain container 7 together with the air flow.

  On the other hand, in the present embodiment, since the silencing mechanisms 60a, 60b, and 60c are provided in the respective portions of the water receiving portion 4, the drain passage 6, and the drain container 7, the resonance frequency of these portions is different from the frequency of the sound wave. Even if they match, the various sound waves can be attenuated by the silencing mechanisms 60a, 60b, 60c. Accordingly, noise during operation can be suppressed, and a low-noise hand drying device can be realized.

  In particular, since the silencing mechanism 60a forms a part of the water receiving portion 4 and has a rib shape at a portion where the high-speed air flow collides with the bottom portion of the water receiving portion 4, the air flow is It is possible to suppress the fluid vibration and vibration generated when colliding with the bottom surface of the receiving portion 4. As a result, it is not necessary to provide a separate reinforcing rib or the like for suppressing vibration and sound at the time of collision, and noise in the drain container 7 can be reduced with a simple structure. Further, since the silencing mechanism 60b is disposed in the middle of the drain passage 6, the silencing effect can be exerted at a stage before the air flow flows into the drain container 7, and the level of noise entering the drain container 7 can be reduced. Can be reduced. Further, since the silencing mechanism 60c is isolated from the water collecting portion 7a in the drain container 7, it is possible to prevent the accumulation of water in the silencing mechanism 60c and to stably exhibit the silencing function.

  Further, in the present embodiment, since the swirling wall 40 is provided near the nozzle hole 12, the swirling flow of the air generated behind the nozzle hole 12 and the air flow newly blowing from the nozzle hole 12 have a gentle angle. Can be joined. That is, since the swirling flow can be rectified by the swirling wall 40, it is possible to suppress generation of a turbulent sound due to a collision between the blown air flow and the swirling flow at a steep angle. In addition, the resonance frequency of the hand insertion portion 3 matches the frequency of the turbulent sound, so that it is possible to prevent the noise from being amplified by the resonance.

  Further, in the present embodiment, since the respective wall surfaces constituting the inner wall of the hand insertion portion 3 and the respective barrier portions 50 and 51 are in a non-parallel state to each other, a resonance frequency exists in the space inside the hand insertion portion 3. Thus, it is possible to prevent the above-described various sound waves from being amplified. In particular, since the upper surface of the hand insertion portion 3 where the nozzle hole 12 is installed and the bottom surface of the water receiver 4 are in a non-parallel state, a large turbulent sound generated near the nozzle hole 12 is generated. Can be prevented from generating a secondary sound source by generating a diffraction phenomenon at the bottom surface of the light emitting element, and the soundproofing performance can be further improved.

  FIG. 7 is a characteristic diagram illustrating a driving sound of the hand dryer according to the first embodiment of the present invention. In this figure, the solid line shows a characteristic diagram of the conventional hand drying device, and the dotted line shows a characteristic diagram of the hand drying device of the present embodiment. As shown in FIG. 7, in the present embodiment, the silencing mechanisms 60 a, 60 b, and 60 c are arranged in the water receiving section 4 and the drain container 7, and the wall sections of the hand insertion section 3 and each of the barrier sections 50 and 51 are attached. By making them non-parallel to each other, the noise level of the hand dryer can be reduced as compared with the prior art.

  In the first embodiment, the configuration in which the drain passage 6 extends in the vertical direction is exemplified. However, the present invention is not limited to this, and the drain port is inclined in the front-rear direction or the left-right direction with respect to the vertical direction. It may be. According to this configuration, it is possible to suppress the sound from entering the drain container 7 from the water receiving portion 4 while ensuring the drainage performance of the drainage passage 6. As a result, it is possible to prevent the operating noise from being amplified by the resonance phenomenon in the drain container 7.

Embodiment 2 FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. A feature of the present embodiment is that the present embodiment is applied to a hand drying device having a specification different from that of the first embodiment. FIG. 8 is a longitudinal sectional view showing a hand dryer according to Embodiment 2 of the present invention. The hand dryer according to the present embodiment includes a casing 1, a hand insertion portion 3, nozzle holes 12a and 12b, a high-pressure airflow generator 9, and the like, similarly to the first embodiment. However, the hand insertion portion 3 is formed as a concave portion that opens upward and is concave downward.

  Of the opening ends of the hand insertion portion 3, the front opening end and the rear opening end face each other in the front-rear direction. The two nozzle holes 12a and 12b are arranged at the front opening end and the rear opening end, respectively, and the positions and angles of the nozzle holes 12a and 12b face each other in the front-back direction. Therefore, in the hand drying device of the present embodiment, the user inserts his / her hand into the hand insertion unit 3 from above, and blows out the inserted hand through the nozzle holes 12a and 12b on both the front and rear sides at a high speed. It is configured as follows.

  The portions of the inner wall of the hand insertion portion 3 located above the nozzle holes 12a and 12b are an upper front end 70 and an upper rear end 71, respectively. The inner wall of the hand insertion portion 3 is formed such that there are no parallel parts that face each other, including the upper front end 70 and the upper rear end 71. That is, the respective wall portions of the hand insertion portion 3 are held in a non-parallel state with each other.

  In the related art, when the hand insertion portion is configured to be opened upward, it is said that turbulent sound and the like when air flow blows out from the nozzle holes 12a and 12b are amplified by resonating between mutually parallel wall surfaces. There's a problem. In particular, in the upper front end 70 and the upper rear end 71, a secondary sound source may be formed due to a sound wave diffraction phenomenon, and the above-mentioned problem becomes conspicuous. On the other hand, according to the present embodiment, since the resonance frequency does not exist in the space inside the hand insertion portion 3, it is possible to suppress the above-described various sound waves from being amplified. In particular, it is possible to prevent a large turbulent sound generated near the nozzle hole 12a and the nozzle hole 12b from diffracting at the upper front end 70 and the upper rear end 71 to become a secondary sound source. Therefore, also in the present embodiment, substantially the same effects as in the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Casing 2 Hand insertion port 3 Hand insertion part 4 Water receiving part 6 Drainage passage (drainage port)
7 Drain container (water receiving cup)
7a Water collection unit 7b Partition 8 Base 9 High-pressure air flow generator (blower means)
REFERENCE SIGNS LIST 10 Internal intake port 11 Internal intake passages 12, 12a, 12b Nozzle hole 13 Outlet passage 14 Hand detection sensor 15 Heater 16 Cover 17 Inclined surface portion 18 External intake port 19 External intake passage 20 Filter 40 Swirling wall 50 Front barrier wall portion 51 Side barrier wall portion 50a, 50b, 50c, 51a, 51b, 51c Curved surface 60, 60a, 60b, 60c Silencer 70 Upper front end 71 Upper rear end

Claims (9)

Blowing means capable of blowing air,
A hand insertion section into which a user can insert a hand,
A nozzle hole provided on a wall surface of the hand insertion portion and blowing air blown by the blowing means toward the inside of the hand insertion portion,
A water receiving portion arranged at the bottom of the hand insertion portion and receiving water scattered from the hand;
A drain port provided in the water receiving portion, for draining water from the water receiving portion,
A water receiving cup that is detachably provided below the drain port and stores water flowing out from the water receiving portion through the drain port;
A first silencing mechanism that is provided in the water receiving unit and suppresses sound when the blower is operated;
With
The hand drying device, wherein the first muffling mechanism is integrally formed in the middle of the drain port, and is formed by partially enlarging a cross-sectional area of the passage at an intermediate portion of the passage forming the drain port. A second silencing mechanism that is provided on the water receiving portion and suppresses sound when the blower is operated;
The second silencing mechanism is at least partially integrally formed with the water receiving portion, wherein the air flow blown out from the nozzle hole is placed inside of the cup receiving the water provided to the back side of the site of the collision Item 2. The hand drying device according to Item 1. Blowing means capable of blowing air,
A hand insertion section into which a user can insert a hand,
A nozzle hole provided on a wall surface of the hand insertion portion and blowing air blown by the blowing means toward the inside of the hand insertion portion,
A water receiving portion arranged at the bottom of the hand insertion portion and receiving water scattered from the hand;
A drain port provided in the water receiving portion, for draining water from the water receiving portion,
A water receiving cup that is detachably provided below the drain port and stores water flowing out from the water receiving portion through the drain port;
A muffling mechanism that is provided in the water receiving portion and suppresses sound when the blower is operated;
With
The water receiving cup,
A water collection unit for directly collecting water flowing from the drain port,
A projecting partition for partitioning the water collecting portion from other portions in the water receiving cup,
With
The hand drying device, wherein the muffling mechanism is disposed in the water receiving cup at a location isolated from the water collecting unit via the partition. The hand dryer according to claim 3 , wherein the muffling mechanism is formed integrally with the water receiving cup. The water receiving section includes a front barrier section erected below the insertion opening for inserting a hand, and side barrier sections erected on both left and right sides of the front barrier section,
The hand dryer according to any one of claims 1 to 4, wherein the front barrier and the left and right side barriers are arranged in a non-parallel state to each other.   The hand drying device according to any one of claims 1 to 5, wherein each wall portion forming an inner wall of the hand insertion portion is configured to be non-parallel to each other. On the wall surface of the hand insertion portion, a turning wall protruding toward the inside of the hand insertion portion is provided,
The swirl wall rectifies an air flow swirling inside the hand insertion portion after being blown out from the nozzle hole, and is configured to reduce collision of the air flow with an air flow newly blown out from the nozzle hole. The hand dryer according to any one of claims 1 to 6.   The hand drying device according to any one of claims 1 to 7, wherein at least a portion of the water receiving portion where the airflow blown from the nozzle hole collides is formed of a material having high vibration damping performance. .   The hand dryer according to any one of claims 1 to 8, wherein the drain port is configured to be inclined with respect to a vertical direction.

Images