JP2022021297A - Hand dryer - Google Patents

Abstract

To provide a hand dryer that can dry hands in a short time compared with a conventional one and that takes no time for a user to rub hands for instance.SOLUTION: The hand dryer includes: a blowout tube 40 that is installed in a dry chamber 15 and that has a slit-shaped nozzle 40a which can blow out air; and a pulse air generator 41 for generating pulse air. The pulse air generator 41 is installed between a supply tube for supplying air to the blowout tube 40 and the blowout tube. The pulse air generated by the pulse air generator 41 is supplied to the blowout tube 40 and then blown out from the nozzle 40a to the hands inserted in the dry chamber 15. Consequently, the hands can be dried in a short time and it takes no time for the user to rub hands for instance.SELECTED DRAWING: Figure 3

Description

The present invention relates to a hand-drying device provided in a hand-washing dryer or a hand dryer to dry water adhering to the hands.

The manufacturing process (main room) in the electronics industry, pharmaceuticals, food fields, etc., where prevention of contamination of suspended particles, bacteria and foreign substances is particularly important, is kept in a clean environment by a clean room, etc. Changing clothes and washing hands are done in the room. For drying after washing hands, a hand dryer (hand dryer) is often used to prevent recontamination. In a general hand dryer, the high-speed airflow blown out from the blowout nozzle blows off water droplets adhering to the fingers, allowing non-contact and short-time drying.
As an example of such a hand dryer, the one described in Patent Document 1 is known.
This hand dryer includes a case, a drying chamber, and a blowing nozzle.

The case is provided with a drying chamber and is formed in a rectangular box shape. The case includes a case body provided with a drying chamber and an upper case detachably attached to the upper opening of the case body. The upper case is provided with a hand insertion slot that opens above the drying chamber.
In addition, a blowout nozzle is provided at the upper part of the drying chamber and behind the manual insertion port, and the blowout nozzle blows air toward the inside of the drying chamber from the tip opening provided at the tip edge thereof. It has become.

Japanese Patent Application Laid-Open No. 2015-223456

By the way, in the above-mentioned hand dryers and hand-washing dryers, it takes a certain amount of time to dry the hands because the moisture is blown off from the hands by continuously blowing air from the blowing nozzles to the hands. In addition, in order to enhance the effect of blowing off the moisture, not only does it take time for the user to rub the hands, but if the inside of the drying chamber is small, it may be difficult to rub the hands.

INDUSTRIAL APPLICABILITY The present invention has been made in view of the above circumstances, and provides a hand-drying device capable of drying hands in a shorter time as compared with the conventional case, and does not require the user to take the trouble of hand-rubbing or the like. The purpose is.

In order to achieve the above object, the hand drying device of the present invention is a hand drying device having a drying chamber for drying the moisture adhering to the hand.
An outlet pipe provided in the drying chamber and having a slit-shaped nozzle capable of blowing air,
Equipped with a pulse air generator that generates pulse air
The pulse air generation unit is provided between the supply pipe that supplies air to the outlet pipe and the outlet pipe.
The pulse air generated by the pulse air generating unit is supplied to the outlet pipe and then blown out from the nozzle toward the hand inserted into the drying chamber through the hand insertion port.
Such a hand drying device is provided in a hand washing dryer or a hand dryer.

In the present invention, when the hand is dried, the pulse air generated by the pulse air generator is supplied to the blowout pipe and then blown out from the nozzle toward the hand inserted into the drying chamber, so that the air is intermittent in the hand. Is sprayed on. Therefore, since the moisture adhering to the hand is blown off so as to be knocked off, the hand can be dried in a shorter time than in the conventional case, and the user does not have to worry about hand fir.

Further, in the configuration of the present invention, the pulse air generating portion is provided in the joint portion connecting the supply pipe and the blowout pipe.
A rapid expansion portion that rapidly expands the flow path cross-sectional area of the air when the air flows into the joint portion from the supply pipe, and a flow of the air when the air flows from the joint portion into the blowout pipe. It may have a sharp reduction portion for sharply reducing the road cross-sectional area.

According to such a configuration, when air flows into the joint portion from the supply pipe, the air pulsates due to the rapid expansion of the flow path cross-sectional area by the rapid expansion portion, and further, the air flows from the joint portion to the blowout pipe. Air pulsates by rapidly reducing the cross-sectional area of the flow path by the sudden reduction portion when flowing in.
Therefore, pulse air can be easily generated, and since the pulse air generation portion is provided in the joint portion, the pulse air is attenuated as compared with the case where the pulse air generation portion is provided at the base end portion of the supply pipe or the like. Can be suppressed.

Further, in the above-mentioned configuration of the present invention, the drying chamber includes an upper surface wall, a front surface wall, both side surface walls, a back surface wall and a bottom surface wall.
The manual insertion slot is provided between the tip of the upper surface wall and the upper end of the front wall.
The outlet pipe is provided near the upper side of the manual insertion port.
The blowing angle of the pulse air ejected from the nozzle of the blowing pipe may be inclined from 10 ° to 20 ° toward the back wall with respect to the vertical plane.

Here, if the blowout angle of the pulse air is less than 10 °, the pulse air tends to leak from the hand insertion port, and if the blowout angle of the pulse air exceeds 20 °, the pulse air collides with the back wall and bounces off, and the hand insertion port. Since it is easy to leak from the air and interferes with the induced airflow described later, the blowing angle of the pulse air is set to 10 ° to 20 °.

According to such a configuration, since the outlet pipe is provided below the upper surface wall and above the inside of the hand insertion port, pulse air can be reliably blown from the nozzle to the hand inserted from the hand insertion port. ..
Further, since the blowing angle of the pulsed air ejected from the nozzle of the blowing pipe is inclined at 10 ° to 20 ° toward the back wall with respect to the vertical surface, it is possible to suppress the leakage of the pulsed air from the manual insertion port. At the same time, the external air is attracted to the drying chamber through the hand insertion port by the pulse air to become an attracted air flow, so that the air volume of the air increases, so that the hands can be dried efficiently.

Further, in the above-mentioned configuration of the present invention, the drying chamber includes an upper surface wall, a front surface wall, both side surface walls, a back surface wall and a bottom surface wall.
The upper surface wall has an inclined wall that inclines downward with respect to a horizontal plane toward the side of the anterior wall, and an extending wall that extends from the tip end portion of the inclined wall to the upper part of the manual insertion opening.
The back wall may be provided with a discharge port for discharging the air in the drying chamber to the outside at the base end portion of the upper surface wall.

According to such a configuration, the inclined wall is inclined downward with respect to the horizontal plane toward the side of the front wall, so that the pulse air ejected from the nozzle of the outlet pipe bounces upward on the bottom wall in the drying chamber. After flowing toward the back wall along the sloping wall, it is discharged from the discharge port. Therefore, the air in the drying chamber can be smoothly discharged from the discharge port, and leakage from the manual insertion port can be suppressed. Further, since the extending wall extends from the tip of the inclined wall to the upper part of the hand insertion port, it is possible to suppress the leakage of air flowing toward the hand insertion opening along the inclined wall.

Further, in the configuration of the present invention, the inclined wall may be inclined at 7 ° to 15 ° with respect to the horizontal plane, and the extending wall may be inclined at 100 ° to 120 ° with respect to the inclined wall.

Here, if the inclination angle of the inclined wall is less than 7 °, the air in the drying chamber may be difficult to flow to the discharge port side and may stay, and if the inclination angle of the inclined wall exceeds 15 °, the inclined wall of the inclined wall may be stagnant. Since the inclination angle becomes too large and it becomes difficult for the air in the drying chamber to be discharged from the discharge port, the inclination angle of the inclined wall is set to 7 ° to 15 °.
Further, if the inclination angle of the extension wall is less than 100 °, when the lengths of the extension walls are the same, the hand insertion opening becomes narrow vertically and it becomes difficult to insert a hand, and the inclination angle of the extension wall is 120. If the temperature exceeds °, air in the drying chamber tends to leak from the manual insertion slot, so the inclination angle of the extending wall is set to 100 ° to 120 °.

According to such a configuration, since the inclination angle of the inclined wall is 7 ° to 15 °, it is possible to suppress the retention of air in the drying chamber and smoothly discharge the air from the discharge port. Further, since the inclination angle of the extending wall is 100 ° to 120 °, leakage of air from the drying chamber from the manual insertion port can be suppressed and the hand can be easily inserted into the manual insertion port.

Further, in the configuration of the present invention, a water droplet guard plate may be provided to prevent water droplets in the drying chamber from scattering to the outside from the discharge port.

According to such a configuration, the water droplet guard plate can prevent the water droplets from scattering from the discharge port to the outside, and only the air flow can be discharged to the outside. Therefore, it is possible to prevent water droplets from adhering to the wall or the like of the place where the hand drying device is installed.

Further, in the configuration of the present invention, the water droplet guard plate may be attached to the base end portion of the upper surface wall.

According to such a configuration, since the water droplet guard plate is attached to the base end portion of the upper surface wall, it is possible to more reliably prevent water droplets from scattering from the discharge port provided at the base end portion of the upper surface wall.

According to the present invention, the hands can be dried in a shorter time than in the conventional case, and the user does not have to worry about hand fir.

It shows an example of the hand-washing dryer provided with the hand-drying apparatus of 1st Embodiment, and is a side view thereof. The same is the front view. It is a figure which shows schematic structure of the drying chamber of the hand drying apparatus of 1st Embodiment. It is a schematic diagram for demonstrating the angle of the inclined wall, the angle of the extending wall, and the blowing angle of a nozzle in the hand drying apparatus of 1st Embodiment. It is a schematic diagram which shows the schematic structure of the outlet pipe of the hand drying apparatus of 1st Embodiment. It is a figure which shows schematic structure of the drying chamber of the hand drying apparatus of 2nd Embodiment. The purpose is to explain an example of a water droplet scattering experiment. (a) is a perspective view showing a state in which a water writing paper is placed near the discharge port, and (b) a perspective view showing a state in which water droplets are attached to the water writing paper. Is.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show the first embodiment of the hand washer / dryer provided with the hand dryer according to the present invention, FIG. 1 is a side view of the hand washer / dryer, and FIG. 2 is a front view of the same.

As shown in FIGS. 1 and 2, the hand-washing dryer 10 of the first embodiment includes a case 11 and a hand-drying device 20 provided in the case 11.
The case 11 is formed in a rectangular box shape, and the sink 12 is housed in the case 11. The case 11 includes a case body 11a for accommodating the sink 12 and an upper case 11b provided on the upper part of the case body 11a, and the inside of the case body 11a and the inside of the upper case 11b communicate with each other up and down.
The upper case 11b is provided with a hand insertion port 11c that opens above the sink 12. As shown in FIG. 2, the manual insertion opening 11c has a horizontally long rectangular opening.

The sink 12 is formed in a rectangular box shape, and an opening is provided in the upper portion thereof. A hand insertion port 11c is arranged above this opening, and the sink 12 communicates with the outside by the opening and the hand insertion port 11c. A drainage port 16 is vertically installed on the bottom wall of the sink 12, and a drainage pipe 17 extending toward a lower drain pan provided at the lower part of the case main body 1a is connected to the drainage port 16.
Further, an automatic faucet 18 is provided above and behind the sink 12. A water supply pipe 18a is connected to the automatic faucet 18, a filter 18b for collecting foreign substances contained in water is connected to the water supply pipe 18a, and the filter 18b is connected to the water supply.
Further, a germicidal lamp 19 is provided on the inner upper portion of the upper case 11b, and the germicidal lamp 19 can sterilize the bacteria adhering to the hand.

Further, the hand drying device 20 has a drying chamber 15. FIG. 3 is a diagram schematically showing a schematic configuration of the drying chamber 15. As shown in FIG. 3, the drying chamber 15 is composed of a sink 12 and a space 12a above the sink 12, and has a top wall 31, a front wall 32, both side walls 33, 33 (see FIG. 2), and a back surface. A wall 34 and a bottom wall 35 are provided, and a portion surrounded by these is a drying chamber 15. The hand insertion port 11c is provided between the tip end portion of the upper surface wall 31 and the upper end portion of the front surface wall 32, and a hand can be inserted into the drying chamber 15 through the hand insertion port 11c.

The upper surface wall 31 is composed of an upper cover 31 that closes the upper opening of the case 11 so as to be openable and closable. The base end portion (right end portion in FIGS. 1 and 3) of the upper surface wall (upper cover) 31 is rotatably attached to the upper end portion of the case 11, whereby the upper surface wall 31 is rotatably attached to the base end portion as an axis. By rotating up and down, the upper opening of the case 11, that is, the upper opening of the drying chamber 15 can be opened and closed.
Further, the upper surface wall 31 has an inclined wall 31a that inclines downward with respect to the horizontal plane toward the front wall 32 in a state where the upper opening of the drying chamber 15 is closed (the state shown in FIG. 3), and the inclined wall 31. It includes an extending wall 31b extending from the tip end portion of the 31a to the upper part of the manual insertion port 11c, and a horizontal wall 31c extending horizontally from the base end portion of the inclined wall 31a.
Further, at the upper end of the back wall 34, a discharge port 36 for discharging the air in the drying chamber 15 to the outside is provided below the horizontal wall 31c.

As shown in FIG. 4, the inclined wall 31a is inclined at an inclination angle of 7 ° to 15 ° with respect to the horizontal plane, but in the present embodiment, it is inclined at an inclination angle α = 9 °. Here, if the inclination angle α of the inclined wall 31a is less than 7 °, the air in the drying chamber 15 may not easily flow to the discharge port 36 side and may stay, and the inclination angle α of the inclined wall 31a is 15 °. If it exceeds, the inclination angle of the inclined wall 31a becomes too large, and it becomes difficult for the air in the drying chamber 15 to be discharged from the discharge port 36. Therefore, the inclination angle of the inclined wall 31a is set to 7 ° to 15 °. ..
The extending wall 31b is inclined at an inclination angle of 100 ° to 120 ° with respect to the inclined wall 31a, but in the present embodiment, it is inclined at an inclination angle β = 114 °. Here, if the inclination angle β of the extending wall 31b is less than 100 °, the hand insertion port 11c becomes narrow vertically when the lengths of the extending walls 31b are equal, making it difficult to insert a hand, and the extending wall becomes difficult to insert. When the inclination angle β of 31b exceeds 120 °, the air in the drying chamber 15 tends to leak from the manual insertion port 11c, so that the inclination angle of the extending wall is set to 100 ° to 120 °.

As shown in FIG. 3, the front wall 32 is composed of an inner surface on the front side (left side in FIG. 3) of the sink 12, and as shown in FIG. 2, the side wall 33 is the inner surface on the side surface side of the sink 12 and the upper end of the case 11. It is composed of an inner side surface of the upper case 11b of the portion facing each other.
As shown in FIG. 3, the back wall 34 is composed of an inner surface 34a on the back side of the sink 12 and an inner surface 34b on the back side of the upper case 11b. Therefore, the back wall 34 has a step between the inner surface 34a and the inner surface 34b.
The bottom wall 35 is composed of the bottom surface of the sink 12.

Further, as shown in FIG. 2, an air supply unit 22 is provided below the sink 12 inside the case 11.
The air supply unit 22 includes a blower 23. The blower 23 is provided inside a casing 24 provided at the bottom of the case body 1a. The front surface (left surface in FIG. 2) of the casing 24 is open, and a pre-filter 25 made of a non-woven fabric or the like is provided in the opening. Further, the rear surface (right surface in FIG. 2) of the casing 24 is open, and the HEPA filter 26 is provided in this opening.
Further, an air flow passage 27 is provided so as to extend vertically on the right side surface side of the case 1, and the upper end portion of the air flow passage 27 is connected to a supply pipe 42 (see FIG. 5) described later. Further, the lower end portion of the air flow passage 27 and the opening on the rear surface side of the casing 24 are connected.

Then, in the air supply unit 22 having such a configuration, when the blower 23 is activated, the air inside the case 11 is sucked into the casing 24 through the pre-filter 25, and the air further passes through the HEPA filter 26. Is supplied to the air flow passage 27. The air supplied to the air flow passage 27 becomes clean air in which foreign substances are collected by the pre-filter 25 and the HEPA filter 26, and the air flows through the air flow passage 27 and is supplied to the supply pipe 42. The air supplied to the supply pipe 42 is supplied to the blowout pipe 40 through the joint portion 45 described later, and is blown out from the nozzle 40a provided in the blowout pipe 40. A part of the air blown out from the nozzle 40a returns to the lower part from the collection port 11d provided on the back surface side of the case 11 and circulates through the pre-filter 25. Further, the rest of the air blown out from the nozzle 40a is discharged to the outside from the discharge port 36.

Further, as shown in FIG. 5, the hand drying device 20 includes a blowout pipe 40 having slit-shaped nozzles 40a and 40a capable of blowing out air, and a pulse air generation unit 41 for generating pulse air.
The outlet pipe 40 is provided in the drying chamber 15 in the vicinity of the upper side of the manual insertion port 11c. Specifically, the blowout pipe 40 is provided below the tip of the upper surface wall 31 and above the inside of the manual insertion port 11c. Further, the blowout pipe 40 is formed in a cylindrical shape, and two slit-shaped nozzles 40a and 40a are provided on the outer peripheral surface thereof at predetermined intervals along the axial direction of the blowout pipe 40. The slit length of the nozzle 40a is set to 100 mm, and the slit width is set to 2 mm, but the present invention is not limited to this.

In the present embodiment, the pulse air blown from the nozzles 40a and 40a is generated by the pulse air blown from the nozzle 40a on the left side, that is, the side far from the base end portion (right end portion in FIG. 5) where air is supplied to the blowout pipe 40. The formed pulse air airflow feels stronger than the pulse air airflow formed by the pulse air blown from the nozzle 40a on the near side, that is, on the right side, that is, the air volume of the pulse air airflow is larger.
On the other hand, the number of pulsations of the pulsed air flow per unit time is larger in the pulse air blown from the nozzle 40a on the right side than in the pulse air blown out from the nozzle 40a on the left side.

Further, as shown in FIG. 4, the ejection angle γ of the pulse air ejected from the nozzles 40a and 40a of the ejection pipe 40 is inclined at 10 ° to 20 ° toward the back wall 34 with respect to the vertical plane. In this embodiment, the blowout angle is γ = 15 °. Here, if the blowing angle of the pulse air is less than 10 °, the pulse air tends to leak from the hand insertion port 11c, and if the blowing angle of the pulse air exceeds 20 °, the pulse air collides with the back wall 34 and bounces off the hand. The blowing angle of the pulse air is set to 10 ° to 20 ° because it easily leaks from the insertion port 11c and interferes with the induced airflow described later.

As shown in FIG. 5, the pulse air generation unit 41 is provided between the supply pipe 42 for supplying air to the blowout pipe 40 and the blowout pipe 40. That is, the supply pipe 42 and the blowout pipe 40 are connected by a joint portion 45, and the joint portion 45 is provided with a pulse air generation portion 41.
The joint portion 45 is formed in the shape of a rectangular parallelepiped hollow box, and includes a connection portion 45a to which the supply pipe 42 is connected and a connection portion 45b to which the blowout pipe 40 is connected.

The connecting portion 45a is composed of a cylindrical pipe and has a flow path cross-sectional area substantially equal to that of the supply pipe 42. Further, the connecting portion 45a is integrally connected to the hole 45c provided on the outer surface facing the lower side of the joint portion 45. The flow path cross-sectional area of the joint portion 45 is larger than the flow path cross-sectional area of the connection portion 45a, whereby when air flows from the supply pipe 42 into the joint portion 45 through the connection portion 45a, the air flow path is concerned. A rapid expansion portion 46 that rapidly expands the cross-sectional area is configured.
Further, a flange portion 40f is provided at the base end portion of the blowout pipe 40, and the flange portion 40f is fixed around the hole 45d provided on the outer surface of the joint portion 45. The flow path cross-sectional area of the blowout pipe 40 is smaller than the flow path cross-sectional area of the joint portion 45, whereby when air flows into the blowout pipe 40 from the joint portion 45, the flow path cross-sectional area of the air is sharply reduced. The rapid reduction unit 47 is configured.
In the present embodiment, the cross-sectional area of the flow path of the joint portion 45 refers to the area of the surface orthogonal to the facing inner wall surface of the hollow box-shaped joint portion of the rectangular parallelepiped.

In the hand drying device 20 of the first embodiment, when a hand is inserted from the hand insertion port 11c, the blower 23 of the air supply unit 22 is activated, so that the air inside the case 11 presses the prefilter 25 and the HEPA filter 26. Foreign matter is collected through the air flow passage 27 and then supplied to the air flow passage 27, and the air supplied to the air flow passage 27 is supplied to the supply pipe 42. The air supplied to the supply pipe 42 is supplied to the blowout pipe 40 through the joint portion 45, and is blown out from the nozzle 40a of the blowout pipe 40.
Since the joint portion 45 is provided with the pulse air generation portion 41, the air supplied to the blowout pipe 40 becomes pulse air and is blown out from the nozzle 40a. As shown in FIG. 3, the pal air blown out from the nozzle 40a becomes a pulse air airflow PA and is intermittently blown to the hand. Therefore, since the moisture adhering to the hand is blown off so as to be knocked off, the hand can be dried in a shorter time than in the conventional case, and the user does not have to worry about hand fir.

Further, the pulse air airflow PA formed by the pulsed air blown from the nozzle 40a attracts the external air through the manual insertion port 11c to become the attracted airflow AT, and the air volume (air amount) in the drying chamber 15 increases.
Further, since the blowout pipe 40 is formed by a cylindrical pipe, the pressure loss is lower than that formed by the square tubular pipe, so that the air volume also increases in this respect as well.
Further, since the pulse air airflow PA collides with the bottom wall 35 of the drying chamber 15 and rebounds and rises, a swirling airflow SA is generated in the upper part of the drying chamber 15, and the swirling airflow SA becomes large due to the increase in air volume.
Therefore, the hands can be quickly dried by the pulsed airflow PA, the attracting airflow AT and the swirling airflow SA.
Then, a part of the air of the pulsed air flow PA, the induced air flow AT, and the swirling air flow SA provided for drying returns to the lower part from the collection port 11d provided on the back surface side of the case 11 and circulates through the prefilter 25. Further, the rest of the air is discharged to the outside from the discharge port 36.

As described above, according to the first embodiment, when the hand is dried, the pulse air generated by the pulse air generation unit 41 is supplied to the blowout pipe 40, and then the hand is inserted into the drying chamber 15 from the nozzle 40a. As it is blown toward, air is blown intermittently on the hand. Therefore, since the moisture adhering to the hand is blown off so as to be knocked off, the hand can be dried in a shorter time than in the conventional case, and the user does not have to worry about hand fir.
Further, since the pulse air generation unit 41 has a rapid expansion portion 46 and a rapid reduction portion 47 provided in the joint portion 45 connecting the supply pipe 42 and the blowout pipe 40, the joint portion from the supply pipe 42 to the joint portion 47. When the air flows into the 45, the rapid expansion portion 46 rapidly expands the cross-sectional area of the flow path, so that the air pulsates, and further, when the air flows from the joint portion 45 into the blowout pipe 40, the rapid reduction portion 47 causes the air to flow. Air pulsates by rapidly reducing the cross-sectional area of the flow path.
Therefore, pulse air can be easily generated, and since the pulse air generation portion 41 is provided in the joint portion 45, the pulse air generation portion 41 is provided at the base end portion of the supply pipe 42 or the like as compared with the case where the pulse air generation portion 41 is provided. It is possible to suppress the attenuation of pulse air.

Further, the blowout pipe 40 is provided below the upper surface wall 31 and above the inside of the manual insertion port 11c, and the blowout angle γ of the pulse air ejected from the nozzle 40a of the blowout pipe 40 is the back wall 34 with respect to the vertical surface. Since it is tilted from 10 ° to 20 ° to the side of the hand, pulse air can be reliably blown from the nozzle 40a to the hand inserted from the hand insertion port 11c, and the pulse air is suppressed from leaking from the hand insertion port 11c. At the same time, the external air is attracted to the drying chamber 15 through the hand insertion port 11c by the pulse air to become the attracted airflow AT, so that the air volume of the air increases, so that the hands can be dried efficiently.

Further, the upper surface wall 31 includes an inclined wall 31a that inclines downward with respect to the horizontal plane toward the side of the front wall 32, and an extending wall 31b that extends from the tip end portion of the inclined wall 31a to the upper part of the manual insertion port 11c. And, since the discharge port 36 for discharging the air in the drying chamber 15 to the outside is provided at the base end portion of the inclined wall 31a on the back wall 34, the pulse air blown out from the nozzle 40a of the blowout pipe 40 is provided. In the drying chamber 15, it bounces off the bottom wall 35 and flows upward, flows toward the back wall 34 along the inclined wall 31a, and is discharged to the outside from the discharge port 36. Therefore, the air in the drying chamber 15 can be smoothly discharged from the discharge port 36, the leakage from the manual insertion port 11c can be suppressed, and the leakage of the air flowing toward the manual insertion port 11c along the inclined wall 31a is extended. It can be suppressed by the wall 31b.
Further, since the inclined wall 31a is inclined at 7 ° to 15 ° with respect to the horizontal plane, it is possible to suppress the retention of air in the drying chamber 15 and smoothly discharge the air from the discharge port 36, and the extending wall 31b. Is inclined at 100 ° to 120 ° with respect to the inclined wall 31a, so that leakage of air in the drying chamber 15 from the manual insertion port 11c can be suppressed and the hand can be easily inserted into the manual insertion port 11c.

In the first embodiment, the case where the hand drying device 20 according to the present invention is applied to the hand washing / drying machine 10 provided with the automatic faucet 18 has been described as an example, but the hand drying device 20 is the automatic faucet 18. It may be applied to a hand dryer that does not have a faucet such as.

(Experimental example)
Next, an experimental example will be described.
An experiment was conducted on the effectiveness of the pulse air generator described above.
(1) Experimental method i) The experiment was carried out with or without the generation of the pulsed air flow formed by the pulsed air. An experimental example has a pulsed air generator, and a comparative example does not.
ii) The hands were sufficiently wetted with water and compared by the evaluation method based on the amount of residual water remaining in the hands after drying for 10 seconds.
iii) Four experiments from A to D were conducted five times, and the average value was calculated.

(2) Experimental Results Table 1 shows experimental examples according to the present invention, and Table 2 shows comparative examples.

From the above results, it can be seen that the drying performance is higher with the pulsed air flow (pulsation).

Next, we conducted an experiment on the drying performance due to the pulsed air flow due to the difference in the volume of the joint where the pulsed air generating part is provided.
(1) Experiment contents An experiment was conducted to verify the difference in drying performance depending on the size (volume) of the joint. The size of the joint used in the experiment is shown below.
In addition, the slit width of the nozzle was 1.6 mm in the past, but since whistle blowing noise is generated from the slit just before the pulse air blowout is stopped, this time the slit width of the nozzle is set to 2.0 mm. Joint part (large): W125 mm × D56.5 mm x H60 mm (volume: 424 cm ³ )
Joint part (middle): W60 mm x D56.5 mm x H57.5 mm (volume: 195 cm ³ )
Joint part (small): W50 mm x D50 mm x H50 mm (volume: 125 cm ³ )
(2) Experimental method i) Experimental conditions Experiments were carried out at large, medium and small joints, and comparisons were made by the evaluation method based on the amount of residual water after drying for 10 seconds. In addition, the above experiments were performed 5 times by 6 people A to F, and the average value was calculated.
(3) Experimental results Tables 3 to 5 show the experimental results of drying performance.

From the results in Tables 3 to 5, the case where the joint portion (small) was used was the most effective in terms of drying performance. It is presumed that the resistance due to rapid expansion and contraction was reduced and the slit width was widened to 2.0 mm, which increased the air volume and improved the drying capacity.
The whistle blowing sound just before the pulse air blowing stopped was eliminated.

FIG. 6 is a diagram schematically showing a schematic configuration of a drying chamber of the hand drying device of the second embodiment.
The difference between the hand-drying device shown in FIG. 6 and the hand-drying device of the first embodiment shown in FIG. 3 is that the hand-drying device is provided with a water droplet guard plate 50. The same components as those in the embodiment may be designated by the same reference numerals and the description thereof may be omitted.

As shown in FIG. 6, the water droplet guard plate 50 prevents water droplets in the drying chamber 15 from scattering from the discharge port 36 to the outside during hand drying, and is, for example, a stainless steel rectangular plate. It is formed by a plate. Further, a protruding portion 51 having a translucent cross section having a U-shaped cross section is fixed to the upper portion of the inner surface 34b on the back surface side of the upper case 11b so as to protrude from the inner surface 34b, and is sterilized inside the protruding portion 51. A light 19 is provided.

The water drop guard plate 50 is arranged so as to be parallel to the front wall 51a of the projecting portion 51, and the lower end portion of the water drop guard plate 50 and the upper end portion of the front wall 51a are in the thickness direction of the water drop guard plate 50 (FIG. 6 overlaps with a predetermined interval in the left-right direction).
Further, the upper end portion of the water drop guard plate 50 is attached to the base end portion of the inclined wall 31a of the upper surface wall 31, whereby the water drop guard plate 50 hangs downward from the base end portion of the inclined wall 31a. ..
Further, the water droplet guard plate 50 and the protruding portion 51 extend in the width direction of the drying chamber 15 (the direction orthogonal to the paper surface in FIG. 6).

In such a hand drying device, a part of the air of the pulsed air flow PA, the attracting air flow AT, and the swirling air flow SA used for drying returns to the lower part from the collection port 11d provided on the back side of the case 11 and presses the prefilter 25. It circulates through. Further, the rest of the air enters the back side (right side in FIG. 6) of the water droplet guard plate 50 from between the lower end portion of the water droplet guard plate 50 and the upper end portion of the front wall 51a of the protrusion 51, and the discharge port. It is discharged to the outside from 36. Further, most of the water droplets generated during hand drying and existing in the above-mentioned pulsed airflow PA, induced airflow AT and swirling airflow SA hit the water droplet guard plate 50 without reaching the discharge port 36, and from the discharge port 36. It is prevented from scattering to the outside.
In addition, in order to prevent water droplets from invading from between the lower end portion of the water droplet guard plate 50 and the upper end portion of the front wall 51a of the protruding portion 51, the water droplets can be collected between them and pass through the air flow (air). A member that can be made to be provided may be provided.

According to the second embodiment, the same effect as that of the first embodiment can be obtained, and the water droplet guard plate 50 for preventing the water droplets in the drying chamber 15 from scattering to the outside from the discharge port 36 is provided. Therefore, the water droplet guard plate 50 can prevent the water droplets from scattering from the discharge port 36 to the outside, and only the air flow can be discharged to the outside. Therefore, it is possible to prevent water droplets from adhering to the wall or the like of the place where the hand drying device is installed.
Further, since the water droplet guard plate 50 is attached to the base end portion of the upper surface wall 31, it is possible to more reliably prevent water droplets from scattering from the discharge port 36 provided at the base end portion of the upper surface wall 31.

(Experimental example)
Next, an example of an experiment in which water droplets are scattered from an outlet will be described.
(1) Experimental method i) Water-writing paper (paper that turns black when it gets wet) near the discharge port provided on the back side of the hand-drying device that does not have a water-drop guide plate (without a water-drop guard plate) And 5 people (5 people of A, B, C, D, E) hand dry 3 times.
ii) Count the number of water droplets scattered on the water writing paper (see FIG. 7).
iii) Only those who have water droplets scattered on the water writing paper (C and E) have a water droplet guard plate (with a water droplet guard plate) near the discharge port provided on the back side of the hand drying device. Place water-writing paper (paper that turns black when it gets wet), dry it by hand three times for each person, and count the number of water droplets scattered on the water-writing paper. That is, re-experiment.

The results are shown in Tables 6 and 7.
Table 6 shows the number of water droplets (pieces) without the water droplet guard plate, and Table 7 shows the number of water droplets (pieces) with the water droplet guard plate.

Conclusion As shown in Table 7, it can be seen that the water droplets during hand drying are blocked by the water droplet guard plate and are effective in preventing scattering from the discharge port.

11c Hand insertion port 15 Drying room 20 Hand drying device 31 Top wall 31a Inclined wall 31b Extension wall 32 Front wall 33 Side wall 34 Back wall 35 Bottom wall 36 Outlet 40 Blowout pipe 40a Nozzle 41 Pulse air generator 42 Supply pipe 45 Fitting Part 46 Sudden expansion part 47 Sudden reduction part 50 Water drop guard plate

Claims (7)

A hand drying device with a drying chamber that dries the moisture adhering to the hands.
An outlet pipe provided in the drying chamber and having a slit-shaped nozzle capable of blowing air,
Equipped with a pulse air generator that generates pulse air
The pulse air generation unit is provided between the supply pipe that supplies air to the outlet pipe and the outlet pipe.
A hand drying device characterized in that pulse air generated by the pulse air generating unit is supplied to the outlet pipe and then blown out from the nozzle toward a hand inserted into the drying chamber through a hand insertion port. The pulse air generating portion is provided in a joint portion connecting the supply pipe and the blowout pipe.
A rapid expansion portion that rapidly expands the flow path cross-sectional area of the air when the air flows into the joint portion from the supply pipe, and a flow of the air when the air flows from the joint portion into the outlet pipe. The hand drying device according to claim 1, further comprising a rapidly reducing portion for rapidly reducing the road cross-sectional area. The drying chamber includes a top wall, a front wall, both side walls, a back wall and a bottom wall.
The manual insertion slot is provided between the tip of the upper surface wall and the upper end of the front wall.
The outlet pipe is provided near the upper side of the manual insertion port.
The first or second aspect of the present invention, wherein the ejection angle of the pulse air ejected from the nozzle of the ejection pipe is inclined from 10 ° to 20 ° toward the back wall with respect to the vertical plane. Hand drying device. The drying chamber includes a top wall, a front wall, both side walls, a back wall and a bottom wall.
The upper surface wall has an inclined wall that inclines downward with respect to a horizontal plane toward the side of the anterior wall, and an extending wall that extends from the tip end portion of the inclined wall to the upper part of the manual insertion opening.
The hand drying apparatus according to any one of claims 1 to 3, wherein a discharge port for discharging air in the drying chamber to the outside is provided on the back wall at a base end portion of the upper surface wall. .. The hand according to claim 4, wherein the inclined wall is inclined at 7 ° to 15 ° with respect to a horizontal plane, and the extending wall is inclined at 100 ° to 120 ° with respect to the inclined wall. Drying device. The hand drying apparatus according to claim 4 or 5, further comprising a water droplet guard plate for preventing water droplets in the drying chamber from scattering to the outside from the discharge port. The hand drying device according to claim 6, wherein the water drop guard plate is attached to a base end portion of the upper surface wall.

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