JP2014113259A - Hand dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand dryer capable of lengthening a service life of each brush motor by performing airflow adjustment of air blown off from first nozzles and second nozzles without utilizing phase control in which the service life of each brush motor is shortened due to abrasion of the brush motor.SOLUTION: A hand dryer blowing air against hands of a user to dry the hands includes: a first brush motor driving a first blower blowing air into first nozzles of a hand drying chamber; a second brush motor driving a second blower blowing air into second nozzles of the hand drying chamber; sensors detecting the hands of the user inserted into the hand drying chamber; and a control part controlling the drive of the first brush motor and the second brush motor on the basis of detection information that the sensors have detected the hands of the user. The control part supplies power to one of the first brush motor and the second brush motor through a resistor part during the drive of the first brush motor and the second brush motor.

Description

  The present invention relates to a hand drying apparatus that blows air on a user's hand to dry the hand.

  In recent years, especially in public toilets and the like, there is an increasing tendency to reduce paper towels for wiping off water adhering to hands after hand washing, and there is an increasing number of cases where hand dryers are installed instead of paper towels. Such a hand-drying apparatus is often installed on a wall surface on a wash counter slightly away from the place where the wash bowl is arranged, or on a wall surface of a toilet space away from the wash counter (Patent Document 1). reference).

  In the hand drying device proposed in Patent Document 1, when the hand is inserted into the opening recess from above the housing and the sensors provided on the palm side wall surface and the instep side wall surface of the opening recess respectively detect the hands, Warm air is blown to the palm side and back side of the hand from a plurality of nozzles on the palm side and back side nozzles, which are provided in a substantially horizontal straight line, respectively, to blow water droplets attached to the hand. However, it is designed to flow downward.

  Further, in order to supply warm air to each of the plurality of nozzles for the palm side and the nozzle for the back side, a fan motor unit for the palm side and a fan motor unit for the back side are provided in the main body of the hand dryer. . Both the fan motor unit for the palm side and the fan motor unit for the back side have the same form having the same maximum output, and both can change the drive rotational speed as desired.

  When warm air is blown to the palm side and back side of the hand, the palm side is more difficult to dry than the back side of the hand, so the amount of air supplied to the palm side is as much as possible so that more wind hits the palm side. When using a hand dryer, set each fan motor unit so that the rotational speed of the palm side rotates faster than the rotational speed of the back side, and the amount of air supplied to the palm side is Larger than the air volume supplied to the side.

JP 2010-227320 A

  In the hand drying device of Patent Document 1, wind speed adjustment from the palm-side nozzle and the back-side nozzle is based on the applied voltage of either the palm-side brush motor or the back-side brush motor, By performing phase control to change the voltage conduction angle with respect to the other brush motor, the output of the other brush motor is lowered to reduce the wind speed. However, a unique phenomenon when phase control is performed is that a spike voltage is generated between the brush and the commutator of the brush motor when the brush motor is driven, resulting in brush wear and reducing the life of the brush motor. It was.

  The present invention has been made in view of such problems, and its purpose is to blow out from the first nozzle or the second nozzle without using phase control that the life of the brush motor is shortened due to wear of the brush motor. An object of the present invention is to provide a hand dryer capable of adjusting the air volume of the air to be used and extending the life of the brush motor.

  In order to solve the above problems, a hand drying device according to the present invention comprises a housing having a hand drying chamber for inserting the user's hand in the hand drying device that blows air on a user's hand to dry. Driving a first nozzle that blows air from the front wall of the hand drying chamber, a second nozzle that blows air from the rear wall of the hand drying chamber, and a first blower that blows air to the first nozzle of the hand drying chamber A first brush motor, a second brush motor that drives a second blower that blows air to a second nozzle of the hand drying chamber, a sensor that detects the user's hand inserted in the hand drying chamber, A control unit that controls driving of the first brush motor and the second brush motor based on detection information that the sensor has detected the user's hand, and the control unit includes the first brush motor and the first brush motor. 2 brushes During operation of the over motor, via one to the resistance portion of the first brush motor and the second brush motor and performs power supply.

  According to the present invention, wear of the brush motor is performed in order to adjust the air volume of the air blown from the first nozzle or the second nozzle with a simple configuration having a resistance portion on one of the first brush motor or the second brush motor. Therefore, it is not necessary to use phase control for shortening the life of the brush motor, and the life of the brush motor can be extended.

  In the hand dryer according to the present invention, the resistor section blows air from the first blower to the first nozzle or air from the second blower to the second nozzle. It is also preferable that the heater is provided in the second air path and supplies heat to the air from the blower.

  In this preferable aspect, since the resistance portion is a heater that supplies heat to the air from the blower, the electrical energy lost in the resistance portion becomes the thermal energy given to the air from the blower, and efficiently heats the air from the blower. be able to.

  In the hand dryer according to the present invention, the control unit supplies power to either the first heater provided in the first air passage or the second heater provided in the second air passage. It is also preferable to include selection means for selecting as described above.

  In this preferable aspect, since the control unit includes selection means for selecting to supply power to either the first heater or the second heater, for example, it is desired to set only the temperature of the air blown from the first nozzle high. In this case, if the selection means selects the power supply so that only the first heater supplies power, the power supply of the entire heater can be reduced, which leads to power saving.

  In the hand dryer according to the present invention, the control unit may include a changing unit that changes the output of the heater in order to change the temperature of the air blown from the first nozzle or the second nozzle. preferable.

  In this preferable aspect, since the control unit includes a changing unit that changes the output of the heater, the temperature of the air blown out from the nozzle can be changed according to the use situation of the user, and the user performs more power saving. It becomes easy.

  According to the present invention, the air volume of the air blown from the first nozzle or the second nozzle is adjusted without using the phase control that the life of the brush motor is shortened due to wear of the brush motor. Can be long.

It is a perspective view which shows the external appearance of the hand dryer which is embodiment of this invention. It is a longitudinal cross-sectional view of the hand dryer shown in FIG. It is a cross-sectional view of the hand dryer shown in FIG. It is a perspective view which shows the inside of the hand dryer shown in FIG. It is a block block diagram which shows the control structure of the hand dryer shown in FIG. It is a control circuit diagram of the hand dryer shown in FIG. It is a flowchart which shows an example of operation | movement of the hand dryer shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  FIG. 1 is a perspective view showing the entire hand dryer 1 of the present embodiment. 2 to 4 are a longitudinal sectional view, a transverse sectional view, and a perspective view showing the inside of the hand drying device 1 of the present embodiment, respectively. The hand dryer 1 includes a housing 2 and a water receiving tray 19. The housing 2 includes a front side member 2a (front side member), a wall surface side member 2b (back side member), a side surface member 2c, and a side surface member 2d. The housing 2 is formed with an opening concave portion 4 as a hand drying portion, and a blower is incorporated below the opening concave portion 4. The opening recess 4 is open upward, and an opening 4u for the user to insert his / her hand is formed.

  This opening recessed part 4 is a part (hand drying part) which arrange | positions a hand there and applies wind and dries. Usually, the hand is inserted into the opening recess (hand drying portion) 4 from above the housing 2 with the palm facing the front side member 2a side of the housing 2 and the back of the hand facing the wall surface side member 2b side of the housing 2. It is like that.

  In the hand drying device 1 of the present embodiment, a hand is inserted into the opening recess 4 from above the housing 2, and sensors (light projecting portion, light receiving portion) provided respectively on the palm side wall surface 4 a and the back side wall surface 4 b of the opening recess 4. Part) 3a, 3b detects the hand, a plurality of palm-side nozzles 6a and instep-side nozzles 6b provided on both wall surfaces 4a, 4b in a substantially horizontal straight line respectively, Warm air is blown to each side of the instep, and it flows downward while blowing water droplets adhering to the hand.

  In the conventional hand drying device, when warm air is blown to the palm side and back side of the hand, the palm side is more difficult to dry than the back side of the hand, so it is supplied to the palm side so that more wind hits the palm side. It is preferable to increase the air volume to be as much as possible, and when using a hand dryer, each fan motor unit is set so that the driving speed for the palm side rotates faster than the driving speed for the back side, The air volume supplied to the palm side is set larger than the air volume supplied to the back side of the hand.

  In the conventional hand dryer, the wind speed adjustment from the palm-side nozzle and the back-side nozzle is based on the applied voltage of either the palm-side brush motor or the back-side brush motor, and the other side By performing phase control to change the voltage conduction angle with respect to the brush motor, the output of the other brush motor is lowered to reduce the wind speed. However, as a phenomenon peculiar when phase control is performed, a spike voltage is generated between the brush and the commutator of the brush motor when the brush motor is driven. .

  Therefore, in the hand drying device 1 of the present embodiment, the hand drying chamber 4 and the housing 2 into which the user's hand is inserted, the first nozzle 6 a that blows air from the side of the hand drying chamber 4, and the hand drying chamber 4 are separated. A second nozzle 6b that blows air from the side of the first brush, a first brush motor 8a that drives the first blower 8a 'that blows air to the first nozzle 6a, and a second fan that drives the second blower 8b' that blows air to the second nozzle 6b. A two-brush motor 8b, a sensor 3a / 3b for detecting a user's hand inserted in the hand drying chamber, and a control unit 21 for controlling the driving of the first brush motor 8a and the second brush motor 8b. Yes.

  Furthermore, in the hand dryer 1 of the present embodiment, the control unit 21 supplies power from the power source to the first brush motor 8a and the second brush motor 8b after the sensor 3a / 3b detects the user's hand. During driving of the first brush motor 8a and the second brush motor 8b, as shown in FIGS. 5 and 6, electric power is supplied to one of the first brush motor 8a or the second brush motor 8b via the resistance unit 20. The air volume of the first nozzle 6a and the second nozzle 6b can be adjusted by supplying and lowering the output of one of the first brush motor 8a or the second brush motor 8b.

  According to the hand drying device 1 of the present embodiment, the air blown from the first nozzle 6a or the second nozzle 6b with a simple configuration through the resistor portion 20 on one of the first brush motor 8a or the second brush motor 8b. Therefore, it is not necessary to use phase control in which the life of the brush motor 8 is shortened due to wear of the brush motor, and the life of the brush motor 8 is increased as compared with the brush motor of the conventional hand dryer. Can do.

  Further, the resistance unit 20 includes the first fin heater 18a that supplies heat provided in the air path between the first nozzle 6a and the first brush motor 8a, or the second nozzle 6b and the second brush motor 8b. It may be the second fin heater 18b that supplies heat provided in the air path between them. Further, as shown in FIG. 6, the resistance unit 20 is provided separately from the fin heater 18 and can be switched when heat is supplied from the fin heater 18 or when heat is not supplied from the fin heater 18. May be.

  In the hand dryer 1 of the present embodiment, the control unit 21 supplies power to either the first fin heater 18a provided in the first air passage or the second fin heater 18b provided in the second air passage. It is desirable to include selection means 22 for selecting to do so. For example, when only the temperature of the air blown from the first nozzle 6a is desired to be set high, if the selection means 22 selects the power supply so that only the first fin heater 18a supplies power based on the information of the operation unit 24. By reducing the power supply of the entire fin heater 18, power can be saved.

  Moreover, in the hand dryer 1 of this embodiment, the control part 21 is provided with the change means 23 which changes the output of a heater in order to change the temperature of the air which blows off from the 1st nozzle 6a or the 2nd nozzle 6b. It is desirable. The temperature of the air blown out from the nozzle 6 can be changed according to the use state of the user, and power can be saved by reducing the power supply of the fin heater 18.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

1: Hand dryer 2: Housing 2a: Front side member 2b: Wall side member 2c, 2d: Side members 3a, 3b: Sensor 4: Opening recess 4a: Wall surface 4b: Wall surface 4u: Opening portion 6a: First nozzle 6b: Second nozzle 8a: first brush motor 8a ': first blower 8b: second brush motor 8b': second blower 18a: first fin heater 18b: second fin heater 19: water receiving tray 20a: first resistance portion 20b: 2nd resistance part 21: Control part 22: Selection means 23: Change means 24: Operation part

Claims (4)

In a hand dryer that blows air on the user's hand to dry it,
A housing having a hand drying chamber for inserting the user's hand;
A first nozzle that blows air from the front wall of the hand drying chamber;
A second nozzle that blows out air from the rear wall of the hand drying chamber;
A first brush motor that drives a first blower that blows air to the first nozzle of the hand drying chamber;
A second brush motor for driving a second blower for blowing air to the second nozzle of the hand drying chamber;
A sensor for detecting the user's hand inserted in the hand drying chamber;
A controller that controls driving of the first brush motor and the second brush motor based on detection information that the sensor detects the user's hand; and
The control unit supplies power to one of the first brush motor or the second brush motor via a resistance unit during driving of the first brush motor and the second brush motor. Drying equipment.   The resistance portion is provided in a first air passage that blows air from the first blower to the first nozzle or a second air passage that blows air from the second blower to the second nozzle, and the blower The hand-drying apparatus according to claim 1, wherein the hand-drying apparatus is a heater that supplies heat to air from the air.   The control unit includes selection means for selecting to supply power to either the first heater provided in the first air passage or the second heater provided in the second air passage. The hand dryer according to claim 2, wherein   The said control part is provided with the change means which changes the output of the said heater in order to change the temperature of the air blown off from the said 1st nozzle or the said 2nd nozzle. The hand drying apparatus as described in.