JP3718900B2 - Hand dryer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hand dryer used for drying hands after washing hands with water, which is used in a washroom, toilet, kitchen or the like.
[0002]
[Prior art]
A conventionally used hand dryer has a structure as shown in FIG. This is a method in which air blown by the electric blower 1 is heated by the heater 2 to be warm air and blown from the blower opening 3, which is an alternative to the operation of wiping hands with a towel, handkerchief or the like. At this time, the user quickly dries his / her hand, for example, by grabbing a wet hand (hereinafter referred to as a wet hand).
[0003]
[Problems to be solved by the invention]
The conventional hand-drying device having the above-described configuration requires a considerable time for drying wet hands, and is inconvenient. That is, the time required for drying is longer than the time that can be put up compared to the time for wiping with a handkerchief or the like. This is because, for example, there is a limit to the capacity of the power supply, and the air flow rate and the heater capacity cannot be increased so much, and the heat transfer efficiency from the heater to the air is extremely poor.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention has a guide in which an air jet hole provided in a drying chamber has a spiral shape on an inner wall so that an air flow to be blown becomes a spiral jet, and the air blown by an electric blower is a spiral jet. As a result, a plurality of swirl jets push away water droplets on the surface of the hand and jump off and quickly peel off and dry.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, the air blow hole provided facing the drying chamber has a spiral guide on the inner wall so that the air flow to be blown becomes a swirl jet, and the air blown by the control unit is a swirl jet. As a hand-drying device, a plurality of spiral jets push away water droplets adhering to the surface of the hand and splash and fly off efficiently.
[0006]
In the invention described in claim 2, the spiral shape of the guide is such that the back of the hand and the back of the palm are set in opposite directions, and the velocity of the jet near the fingertip is extremely small, and the gravity of the water droplets It is a hand dryer that facilitates falling and drying efficiently.
[0007]
The invention described in claim 3 is a hand-drying device that efficiently dries by moving the water droplets on the hand surface with double force, with the spiral shape of the guides of the adjacent air ejection holes set in opposite directions. .
[0008]
【Example】
(Example 1)
The first embodiment of the present invention will be described below. FIG. 1 is an external view showing a configuration of a hand dryer according to the present embodiment. The main body 4 is provided with an insertion port 6 for inserting a hand, a drying chamber 5 provided in connection with the insertion port 6 for drying the inserted hand, and a control unit 10. The control unit 10 includes an electric blower that blows air to the drying chamber 5, a control component for controlling the electric blower, and the like. In the upper part of the drying chamber 5, that is, in the vicinity of the insertion opening 6, a plurality of air ejection holes 8 and a plurality of air ejection holes 9 for ejecting air blown from the electric blower are provided to face each other. The air ejection hole 8 ejects blown air to the palm side, and the air ejection hole 9 ejects blown air to the back side of the hand.
[0009]
The air ejection hole 8 and the air ejection hole 9 are configured as shown in FIG. That is, the inner wall 12 serves as a guide 13 that constitutes the air blowing path 11 of the blower air of the electric blower, and the guide 13 has a spiral shape. Therefore, the air flow 14 ejected from the air ejection holes 8 and 9 is a spiral jet.
[0010]
The operation of this embodiment will be described below. When a hand is inserted into the insertion slot 6, a switch (not shown) is automatically turned on, and the electric blower of the function unit 10 starts operating. The airflow generated by the electric blower is ejected at high speed toward the drying chamber 5 from the air ejection holes 8 and 9 provided to face each other through the air blowing path 11. At this time, the air flow blown out from the air ejection holes 8 and 9 is a spiral jet because the guide 13 is spiral. Therefore, as shown in FIG. 3, the jet 14 collides with the wet hand 7 in a spiral state. This spiral jet is almost parallel when it collides with the surface 15 of the hand, and acts to peel off the water droplets 16 adhering to the surface 15 of the hand. That is, since the spiral jet 14 ejected from the ejection holes 8 and 9 collides with the surface 15 of the wet hand 7 at a high speed, the water droplet 16 jumps off. In addition, since these two spiral jets are substantially parallel on the hand surface 15, the two swirl jets have the effect of flushing the water droplets 16. By combining these effects, in this embodiment, the hand can be dried in a short time.
[0011]
(Example 2)
Next, a second embodiment of the present invention will be described. FIG. 4 shows the configuration of this embodiment. In the present embodiment, the plurality of air ejection holes 17 and the plurality of air ejection holes 18 provided opposite to the drying chamber 5 respectively have spiral guides 19 and 20 on the inner walls thereof. The spiral directions of the guide 19 and the guide 20 are opposite to each other.
[0012]
The operation of this embodiment will be described below. As shown in FIG. 5, when the two high-speed spiral jets 21 and 22 collide with the surface of the wet hand 15, the water droplets 21 and 23 adhering to the surface are almost flushed away. Act on. Further, since the swirl jets 21 and 22 collide with the wet hands at a high speed, the water droplets 21 and 23 jump off. Particularly in the present embodiment, at the fingertip 24 where the two spiral jets 21 and 22 directly collide with each other, the wind speed applied to the water droplet 25 is almost zero because the spiral jets 21 and 22 are synthesized. For this reason, the water droplet 25 is dropped downward only by gravity. That is, when the user removes his / her hand from the inside of the drying chamber 5 in the direction of the insertion port 6 as the drying progresses, the water droplets drop smoothly without dropping.
[0013]
As described above, in this embodiment, it is possible to realize a hand-drying device that is more convenient to use.
[0014]
(Example 3)
Next, a third embodiment of the present invention will be described. FIG. 6 shows the configuration of this embodiment. In the present embodiment, the plurality of air ejection holes provided in the drying chamber 5 are such that the spiral shapes of the guides of the adjacent air ejection holes 26 and 27 are opposite to each other. Accordingly, the spiral jets 30 and 31 ejected from the air ejection holes 26 and 27 have the spiral directions opposite to each other.
[0015]
For this reason, as shown in FIG. 7, the spiral flow ejected from the air ejection holes 26 and 27 collides with the water droplets 33 and 34 adhering to the surface of the wet hand 7 in the same direction. Accordingly, the water droplets 33 and 34 receive the spiral flow in the same direction and are separated from the surface of the wet hand 7 at double speed. Of course, in this case, if the user moves the inserted wet hand 7 slightly to the left and right, this effect becomes clearer.
[0016]
【The invention's effect】
The invention described in claim 1 includes an insertion port for inserting a hand, a drying chamber connected to the insertion port for drying the inserted hand, an electric blower for blowing air to the drying chamber, and the drying chamber. A plurality of air jet holes provided opposite to each other, and each air jet hole has a spiral guide on the inner wall so that the air flow to be blown out becomes a spiral jet . The present invention realizes a hand-drying device that sweeps away water droplets adhering to the surface and splashes and efficiently peels and dries them.
[0017]
The invention according to claim 2 sets the spiral shape of the guide to the back of the hand and that of the palm in opposite directions so that the flow velocity at the fingertip portion is extremely small, and the drop of water droplets is promoted by gravity. And a hand-drying apparatus that dries efficiently.
[0018]
In the invention described in claim 3, the guide spiral shape is such that the adjacent air ejection holes are in opposite directions, and the flow direction directions of the adjacent vortices coincide at the vortex contact point. This is to realize a hand drying device that doubles the flow rate, pulls moisture more strongly, and dramatically increases the drying speed of the hand.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a hand drying apparatus according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of an essential part showing an ejection hole. FIG. FIG. 4 is a cross-sectional view of an essential part showing an ejection hole of a hand drying apparatus according to a second embodiment of the present invention. FIG. 5 is an explanatory diagram for explaining the operation on the hand surface. FIG. 7 is a cross-sectional view of the main part showing an ejection hole of a hand dryer according to a third embodiment of the invention. FIG. 7 is an explanatory view for explaining the operation on the surface of the hand. [Explanation of symbols]
5 Drying chamber 6 Insertion port 8 Air ejection hole 9 Air ejection hole 10 Control part 12 Inner wall 13 Guide 17 Air ejection hole 18 Air ejection hole 19 Guide 20 Guide 26 Air ejection hole 27 Air ejection hole 28 Guide 29 Guide

Claims (3)

An insertion port for inserting a hand, a drying chamber connected to the insertion port for drying the inserted hand, a control unit for blowing air to the drying chamber, and a plurality of airs provided opposite to each other in the drying chamber Each air jet hole has a spiral guide on the inner wall so that the air flow to be blown out becomes a spiral jet, and a plurality of spiral jets pushes water droplets on the surface of the hand and jumps off. Hand dryer.   The hand dryer according to claim 1, wherein the spiral shape of the guide is set to be opposite to each other with respect to the back of the hand and the palm.   The hand dryer according to claim 1, wherein the spiral shape of the guide is such that adjacent air ejection holes are in opposite directions.

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