WO2016203528A1

WO2016203528A1 - Hand dryer

Info

Publication number: WO2016203528A1
Application number: PCT/JP2015/067200
Authority: WO
Inventors: 達也藤村; 森　亮二; 村井　亮太
Original assignee: 三菱電機株式会社
Priority date: 2015-06-15
Filing date: 2015-06-15
Publication date: 2016-12-22

Abstract

The present invention includes: a box body (7); an airflow generating device (10) that is provided in the box body (7) and that generates airflow through the rotation of a motor (11); nozzles (2) that are provided in the box body (7) and that blow the airflow generated by the airflow generating device (10) into a drying space (1); a hand detecting sensor (3) that detects insertion and extraction of hands into and from the drying space (1); and a control unit (6) that performs control such that, when the hand detecting sensor (3) detects insertion of hands, the motor (11) of the airflow generating device (10) is rotated, and, when the hand detecting sensor (3) detects extraction of hands, the rotation of the motor (11) is forced to slow down.

Description

Hand dryer

The present invention relates to a hand drying device that blows air on a hand inserted into a hand insertion portion to dry the hand.

In order to maintain the hand in a sanitary state, it is preferable that the drying treatment after washing is performed hygienically together with the hand washing treatment. In order to carry out the drying procedure in a sanitary manner, a high-speed air stream is blown against the wet hands after washing inserted in the hand insertion section, which is a drying treatment space, and the water adhering to the hands is blown away and dried A drying apparatus is disclosed in Patent Document 1.

In this type of hand dryer, when a hand is inserted into the hand insertion section, the hand detection sensor detects the insertion of the hand, and the high-pressure airflow generator operates. When the high-pressure airflow generator operates, a high-speed airflow is ejected from the nozzle formed in the manual insertion portion and sprayed on the hand in the manual insertion portion. When the hand detection sensor detects that the hand has been removed from the hand insertion portion, the high-pressure airflow generator is stopped, and the ejection of the high-speed airflow from the nozzle is stopped.

Japanese Patent No. 5370309

However, in the conventional hand dryer, the high pressure air flow generator is stopped by stopping the energization of the motor included in the high pressure air flow generator. Even when the energization of the motor was stopped, the motor continued to rotate due to inertia for a while, so even if the hand was removed from the manual insertion portion, the ejection of the high-speed air flow from the nozzle did not stop immediately. For this reason, when the hand is removed and the hand is re-inserted into the hand insertion part immediately, there is a problem that water droplets attached to the hand move to the wrist side or scatter to the face.

In addition, since the blowout of air from the nozzle continues even after the previous user pulls out his hand, there is a problem that it is difficult for the next user to immediately insert his hand into the hand insertion part. It was. In addition, there is a problem that noise generated by the ejection of air from the nozzle continues for a while after the hand is pulled out.

The present invention has been made in view of the above, and an object of the present invention is to obtain a hand drying device that shortens the time required to blow air after a hand is removed from the drying processing space.

In order to solve the above-described problems and achieve the object, the present invention is provided in a box, an air flow generator provided in the box and generating an air flow by rotation of a motor, and the box. A nozzle that ejects the airflow generated by the airflow generator into the drying treatment space, a hand detection sensor that detects insertion and removal of a hand into the drying treatment space, and when the hand detection sensor detects insertion of a hand And a control unit that performs control to rotate the motor of the airflow generator and forcibly decelerates the rotation of the motor when it detects the removal of the hand.

The hand drying apparatus according to the present invention has an effect that it is possible to shorten the time of air ejection after the hand is pulled out from the drying processing space.

Sectional drawing which shows schematic structure of the hand-drying apparatus concerning Embodiment 1 of this invention. FIG. 3 is a flowchart for explaining the operation procedure of the hand dryer according to the first embodiment. FIG. 6 is a flowchart for explaining a modification of the operation procedure of the hand dryer according to the first embodiment. Sectional drawing which shows schematic structure of the hand-drying apparatus concerning Embodiment 2 of this invention.

Hereinafter, a hand dryer according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a schematic configuration of a hand-drying apparatus according to Embodiment 1 of the present invention. The hand dryer 20 includes a box 7 having a box shape. On the top surface of the box body 7, a hand insertion portion 1 that is recessed toward the bottom surface side is formed. The manual insertion portion 1 is also opened on the side surface side of the box body 7.

A nozzle 2 is formed on the wall surface of the manual insertion portion 1. A suction port 8 is formed in the box 7. Inside the box 7, an air passage 9 connecting the suction port 8 and the nozzle 2 is formed. A high-pressure airflow generator 10 that is an airflow generator is provided in the air passage 9 inside the box body 7. The high-pressure airflow generator 10 includes a motor 11 and a turbo fan 12. As the motor 11 rotates, the turbo fan 12 also rotates, and a high-speed air flow from the suction port 8 toward the nozzle 2 is generated in the air passage 9. The motor 11 is a DC brushless motor, for example.

The high-speed air flow generated by the rotation of the motor 11, that is, the rotation of the turbo fan 12 is ejected to the manual insertion portion 1 through the nozzle 2. The air ejected from the nozzle 2 is blown onto the hand inserted into the hand insertion unit 1, so that moisture attached to the hand is blown away. The blown-off water is guided to a drain tank 5 provided at the lower part of the manual insertion portion 1 and stored therein. The hand insertion unit 1 is a drying processing space for drying the inserted hand.

The hand drying device 20 includes a hand detection sensor 3 and a control unit 6. The hand detection sensor 3 detects insertion and extraction of a hand from the hand insertion unit 1 and sends detection information to the control unit 6. The control unit 6 controls the high-pressure airflow generator 10 based on detection information from the hand detection sensor 3.

Specifically, when insertion of a hand into the hand insertion unit 1 is detected by the hand detection sensor 3, the motor 11 of the high-pressure airflow generator 10 is rotated to eject air from the nozzle 2. After that, when the hand detection sensor 3 detects the removal of the hand from the hand insertion portion 1, the rotation of the motor 11 is forcibly decelerated. Examples of a method for forcibly decelerating the rotation of the motor 11 include a method using a regenerative brake and a method of mechanically decelerating the rotation.

Next, the operation of the hand dryer 20 according to the first embodiment will be described. FIG. 2 is a flowchart for explaining the operation procedure of the hand dryer 20 according to the first embodiment.

First, the hand detection sensor 3 detects whether or not a hand has been inserted into the hand insertion unit 1 (step S20). When it is detected that a hand has been inserted into the hand insertion unit 1 (step S21, Yes), the motor 11 of the high-pressure airflow generator 10 is rotated (step S22). Thereby, air is ejected from the nozzle 2.

Next, the hand detection sensor 3 detects whether or not the hand has been removed from the hand insertion portion 1 (step S23). When it is detected that the hand has been removed from the manual insertion unit 1 (Yes in step S24), the rotation of the motor 11 of the high-pressure airflow generator 10 is forcibly decelerated and the rotation of the motor 11 is stopped. (Step S25). Thereby, the ejection of air from the nozzle 2 is stopped.

If it is not detected in step S21 that a hand has been inserted into the hand insertion unit 1 (No in step S21), the process returns to step S20. If it is not detected in step S24 that the hand has been removed from the hand insertion portion 1 (No in step S24), the process returns to step S23.

Thus, by forcibly stopping the rotation of the motor 11, the time for which the motor 11 rotates after the hand is removed from the hand insertion portion 1 can be shortened. Thereby, the ejection of air from the nozzle 2 is stopped immediately after the hand is removed from the hand insertion portion 1. Therefore, even if the hand is removed from the hand insertion part 1 and the hand is re-inserted immediately, water droplets adhering to the hand are prevented from moving to the wrist side or splashing from the hand to the arm, sleeve or face. it can.

Further, when the motor 11 is stopped by the regenerative brake, the generated electric energy is converted into heat energy by the resistance component of the motor 11, so that the coldness felt by the air blown from the nozzle 2 at the next use is reduced. can do.

Also, it is possible to shorten the time during which noise is generated due to the rotation of the motor 11 such as the ejection of air from the nozzle 2. Further, since the ejection of air from the nozzle 2 is stopped immediately after the hand is extracted from the hand insertion portion 1, the next user can easily insert the hand into the hand insertion portion 1 immediately.

Note that the hand drying device may be a hand drying device in which a hand insertion portion into which a hand can be inserted is formed on the front surface of the box 7.

FIG. 3 is a flowchart for explaining a modified example of the operation procedure of the hand dryer 20 according to the first embodiment. In this modified example, when hand removal is detected, the motor 11 is operated without low air flow immediately without stopping.

First, the hand detection sensor 3 detects whether or not a hand has been inserted into the hand insertion unit 1 (step S30). When it is detected that a hand has been inserted into the manual insertion unit 1 (Yes in step S31), the motor 11 of the high-pressure airflow generator 10 is rotated at the first rotational speed (step S32). Thereby, air is ejected from the nozzle 2. The first rotational speed is set to a rotational speed at which a sufficient amount of air is ejected from the nozzle 2 to blow away moisture adhering to the hand.

Next, the hand detection sensor 3 detects whether or not the hand has been removed from the hand insertion portion 1 (step S33). When it is detected that the hand has been removed from the manual insertion portion 1 (Yes in step S34), the rotation of the motor 11 of the high-pressure airflow generator 10 is rotated at a second rotation less than the first rotation speed. The number is forcibly decelerated (step S35). Thereby, the ejection amount of the air from the nozzle 2 is suppressed. The second number of rotations is set to a number of rotations such that even if the air ejected from the nozzle 2 is blown onto the hand, the attached moisture is not blown away.

Next, when the operation time of the motor 11 at the second rotation speed has exceeded a predetermined time, for example, 10 seconds (step S36, Yes), the rotation of the motor 11 is stopped (step S37). ).

If it is not detected in step S31 that a hand has been inserted into the hand insertion unit 1 (No in step S31), the process returns to step S30. If it is not detected in step S34 that the hand has been removed from the hand insertion unit 1 (No in step S34), the process returns to step S33. In step S36, when the fixed time has not elapsed (step S36, No), the operation at the second rotational speed is continued.

In this modified example, the amount of air ejected from the nozzle 2 is suppressed to such an extent that the moisture adhering to the hand is not blown away immediately after the hand is removed from the hand insertion portion 1. Even if the hand is reinserted immediately, water droplets attached to the hand can be prevented from moving to the wrist side or from the hand to the arms, sleeves and face. Further, in the operation of the motor 11 at the second rotational speed, the generation of noise can be suppressed as compared with the operation of the motor 11 at the first rotational speed. Therefore, it is possible to shorten the time during which noise is generated due to the rotation of the motor 11.

Further, when the hand is reinserted immediately after the hand is extracted from the hand insertion portion 1, the motor 11 is not completely started from the stopped state, and therefore, the rotational speed of the motor 11 reaches the second rotational speed. The time can be shortened. In other words, it is possible to shorten the time until a sufficient amount of air is blown from the nozzle 2 to blow off the moisture adhering to the hand.

Further, if the motor 11 is a DC brushless motor, the driving method includes a sensor drive using a rotation detection sensor such as a Hall element for rotation detection of the rotor of the motor 11 and a stator of the motor 11 without using the rotation detection sensor. There is a sensorless drive for detecting the rotation of the rotor based on the back electromotive voltage generated in the coil.

In the case of sensorless drive, the rotor position cannot be detected when the rotor is stopped, and the stator must be energized without knowing the rotor position at startup. Depending on the position of the stopped rotor, it rotates forward or backward. Therefore, in the case of sensorless drive, it is first determined whether the motor is rotating forward or backward with the counter electromotive voltage generated in the stator after startup, and in the case of reverse rotation, the energization is immediately stopped and restarted. Therefore, it is necessary to repeat until the rotation is forward.

However, according to this modification, the rotor is not completely stopped even in the sensorless drive, so the position and the rotation direction of the rotor can be detected, and the rotation direction of the motor 11 can be detected when the hand is reinserted. The processing time for detecting the pressure and the processing time until the forward rotation in the case of reverse rotation can be omitted, and air can be immediately ejected from the nozzle 2. Therefore, the sensorless drive motor 11 is easily adopted. In general, since a sensorless drive motor is less expensive than a sensor drive motor, the manufacturing cost can be reduced by using a sensorless drive motor.

Embodiment 2. FIG.
FIG. 4 is a cross-sectional view illustrating a schematic configuration of the hand dryer 30 according to the second embodiment of the present invention. In addition, about the structure similar to the said Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted. In the hand drying device 30 according to the second embodiment, no concave portion is formed on the top surface of the box body 37, and air is jetted below the box body 37 from the nozzle 32 provided on the bottom surface of the box body 37. The A space below the box 37 in which air is ejected from the nozzle 32 is a hand drying unit 31 which is a drying processing space. Also in the hand drying device 30 according to the second embodiment, the motor 11 rotates after the hand is removed from the hand drying unit 31 by operating according to the operation procedure shown in FIG. The time to do can be shortened. Further, in the hand drying device 30 according to the second embodiment as well, after the hand is extracted from the hand drying unit 31 by operating according to the operation procedure shown in FIG. It is possible to shorten the time until the generation of noise and the ejection of air during reinsertion.

The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1 hand insertion part (drying treatment space), 2, 32 nozzles, 3 hand detection sensor, 5 drain tank, 6 control part, 7, 37 box, 8 suction port, 9 air path, 10 high pressure air flow generator (air Flow generator), 11 motor, 12 turbofan, 20, 30 hand dryer, 31 hand dryer (drying space).

Claims

Box and
An air flow generator provided in the box for generating an air flow by rotation of a motor;
A nozzle that is provided in the box and causes the airflow generated by the airflow generator to be ejected into the drying treatment space;
A hand detection sensor for detecting insertion and extraction of a hand from the drying processing space;
Control for rotating the motor of the airflow generator when the hand detection sensor detects insertion of a hand, and control for forcibly decelerating rotation of the motor when removal of the hand is detected A hand-drying device.
2. The hand drying apparatus according to claim 1, wherein the control unit performs control to forcibly stop the rotation of the motor when the hand detection sensor detects removal of a hand.
The control unit performs control to rotate the motor of the airflow generation device at a first rotational speed when the hand detection sensor detects insertion of a hand, and when the hand detection is detected, The hand dryer according to claim 1, wherein control is performed to forcibly decelerate the rotation to a second rotational speed that is less than the first rotational speed.