JP2777831B2 - Control method of hot air temperature in hot air drying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to hot air drying in which a hand held over a predetermined position is detected by a sensor, and a fan and a heater are driven to discharge hot air to the position of the hand. The present invention relates to a method for controlling hot air temperature in an apparatus.

[Conventional technology]

Conventionally, a hot air drying device uses a fan that rotates a motor to send air heated by a heater when a hand is sensed, and the air is heated by a fan. It has a structure that discharges hot air with a volume of air of the same amount.The amount of heat applied to the hot air is constant, so the temperature of the discharged hot air is not constant due to the outside air temperature, and the feeling of dryness is not clear. there were.

[Problems to be solved by the invention]

Thus, as shown in FIG. 1, the change in the temperature of the hand surface obtained by blowing hot air onto the wet hand can be expressed as follows, where I is the surface temperature of the hand before being wet with water (about 30 ° C.). When it gets wet
When the temperature drops to the temperature indicated by II (approximately 25 ° C.) and the discharge of warm air is started from this point, the heat of vaporization from the surface of the hand is greater than the heat applied by the warm air (hereinafter referred to as “drying initial A”).
Lowers the hand surface temperature further to the lowest temperature III (about 22.5
° C). When the moisture on the surface of the hand evaporates and falls below a predetermined value, the surface temperature of the hand gradually rises due to the heat of the sprayed temperature (hereinafter referred to as “middle drying period B”), and finally the temperature I before it gets wet with water. , And if the hand is kept on, the surface temperature of the hand further rises (hereinafter referred to as “late drying C”).
And drying is continued.

Therefore, in general, the discharged warm air is felt cold in the initial drying period A, and the discharged hot air is felt hot in the latter drying period C, so that a comfortable drying atmosphere cannot be obtained. In addition, the time required for drying is prolonged. .

Further, since the drying speed varies depending on the temperature of the hand and the temperature of the outside air, a predetermined effect cannot be obtained even if the temperature of the discharged hot air is controlled by a fixed program.

The present invention has been made in view of the above problems,
A warm air dryer that can stably, comfortably, and quickly dry hands without giving a “cold” or “hot” feeling when drying, and regardless of the outside air temperature or how wet the hands are. The purpose of the present invention is to propose a method for controlling the temperature of hot air in the above.

[Means for solving the problem]

In order to achieve the above object, a method of controlling a hot air temperature in a hot air drying device according to the present invention is to set a flow rate and a temperature of the hot air to be discharged toward a hand held in advance by a dry state of the hand. The purpose is to change the fan speed in a stepless and variably controllable manner, and to supply current to a heater that heats the air supply by the fan. A variable drive control of the current variable means that can be variably controlled in steps is variably driven and controlled by a controller, and the surface temperature of the hand is detected by a radiation temperature sensor provided at a desired position of the held hand, and according to the detected hand surface temperature, The air volume and the temperature of the set discharge temperature are controlled.

FIG. 2 is a block diagram showing an example of a configuration for realizing the method, and FIG. 3 is a flowchart showing a control method.

In the drawing, reference numeral 9 denotes an electric motor such as an AC motor that rotationally drives the sirocco-type fan 10 in order to obtain air discharged from the hot air discharge port 13, performs output control by the controller 8 via an inverter 15, and The speed is controlled steplessly, and the air volume from the warm air discharge port 13 changes steplessly within a range previously input to the controller. Reference numeral 14 denotes a heater for ventilation heating, which performs phase control by the controller 8 via a solid state relay (SSR) 16 and continuously increases or decreases the amount of heat generated by the heater 14 so as to reduce the amount of discharged hot air. The temperature is varied steplessly from "high temperature" to "low temperature" in a range previously input to the controller.

Reference numeral 17 denotes a temperature sensor provided in a discharge hot air passage, which constantly detects the temperature of the hot air and inputs the detected temperature to the controller 8. Reference numeral 18 denotes a radiation temperature sensor provided at a desired position of the hand to be held, which has a structure for detecting the surface temperature of the hand and constantly outputting the surface temperature information of the hand to the controller 8.

The controller 8 uses the input information of the sensor unit 5 for detecting the presence / absence of the hand and the radiation temperature sensor 18 for detecting the surface temperature of the hand, so that a timing chart is set in accordance with a preset hot air discharge program (see FIG. 4). Is driven in accordance with.

That is, in comparison with the graph of FIG. 1, the heat of vaporization from the surface of the hand becomes larger than the heat applied by the warm air,
During the period corresponding to the initial period A (for 5 seconds) when the user feels "cold", the temperature information from the radiation temperature sensor 18 which is started after the sensor unit 5 senses the hand held by the sensor unit 5 has the sign of the differential value reversed. Until the change (from negative to positive), A 'is set, the control mode A' is gradually increased from the wind speed of 20 m / s to the final value of 30 m / s, and the temperature of the discharge hot air is set to approximately 80 m / s. Decrease gradually from ℃ to 60 ℃.

Medium drying period B required for general drying (about 20 seconds)
During the time corresponding to the temperature information from the radiation temperature sensor 18 is
After the sign of the differential value is reversed, the period from the point D at which the measured value reaches approximately 30 ° C. is defined as B ′, the control mode B ′ is maintained at a discharge air flow rate of 30 m / s, and the discharge hot air flow is maintained. Is maintained at approximately 60 ° C.

Further, the control mode C 'after the point D corresponding to the late-stage drying C in which the heat of vaporization from the surface of the hand is larger than the heat applied by the warm air and corresponds to the late-stage C which is felt "hot", the discharge air volume is set at the wind speed 30
m / s and gradually reduce the temperature of the discharged hot air to approximately 60
Gradually lower from ° C.

Note that the above time setting, wind speed, hot air temperature, and the like are examples of implementing the hot air drying device according to the present invention, and can be appropriately changed according to the driving capability of the device.

[Action]

Therefore, the temperature of the warm air discharged toward the hand held gradually decreases from the maximum temperature during the initial drying period A ′, and is maintained at the intermediate temperature during the middle drying period B ′.
In the later stage of drying C ′, it gradually decreases,
The lengths of A ', B', and C 'are properly varied individually depending on the dryness of the hand over which the hand is held, based on the temperature information from the radiation temperature sensor 18.

In the temperature control, the amount of heat generated by the heater 14 is controlled by comparison with an absolute temperature by the temperature sensor 14,
As a result, regardless of the outside air temperature, a preset temperature and air volume of the hot air are secured, the cold feeling in the early stage A 'of drying is alleviated, and the hot feeling in the late stage C' of the drying is also eliminated.
Then, the appropriate air volume and warm air temperature in the middle drying period B 'are set, and the drying time can be shortened.

〔Example〕

Hereinafter, an embodiment of a method for controlling hot air temperature in a hot air drying apparatus according to the present invention will be described with reference to the drawings.

FIG. 5 is a partially cutaway longitudinal sectional view showing a hot-air drying device provided with a hot-air temperature control device of the present invention. This is a case of the hot air drying device having the above configuration. In this device accommodation room 3,
Hot air unit 4, sensor unit 5, power switch 7
And a component device such as the controller 8 including the inverter 15 and the SSR 16 is housed and mounted. The front cover 2 forms a substantially semi-cylindrical device accommodating chamber 3 for accommodating the electric motor 9 of the hot air unit 4, and has a sirocco type fan 10 of the hot air unit 4 built in below the chamber. An exhaust duct 12 communicating with the blower case 11 is formed, and a warm air discharge port 13 is formed at a lower end thereof. The hot air outlet 13 is provided with a sensor unit 5 facing the hot air discharge position, and a terminal block (not shown) connected to the power switch 7 is fixedly provided inside the casing 1. These components are covered by the front cover 2 from the front. In the present embodiment, the controller 8 is fixed to the outer surface of the blower case 11 of the hot air blower unit 4.

The hot air unit 4 includes a blower case 11 and an electric motor 9.
A sirocco-type fan 10 rotatably mounted on the drive shaft is controlled in a stepless manner to control the number of revolutions of the electric motor 9 in a stepless manner by an output variable by an inverter 15 so as to control and adjust the air volume from the hot air discharge port 13. A ventilation heater 14 provided in the exhaust duct 12 is connected via an SSR 16 and performs a phase control by the controller 8 so that the calorific value of the heater 14 is steplessly increased and decreased. The temperature of the discharged hot air is changed steplessly.

A temperature sensor 17 for detecting the temperature of the hot air is provided downstream of the hot air passage of the heater 14, and the temperature output is input to a temperature comparison unit (not shown) of the controller 8 to control the temperature. And drives the SSR16 in a controlled manner. A known radiant temperature sensor 18 that measures the surface temperature of the held hand is provided at a position where the held hand can be approached in the vicinity of the hot air discharge port 13, and the detected surface temperature of the hand is determined. The structure is such that it is always output to the controller 8 as “hand surface temperature information”.

The temperature sensor 17 is provided at a suction portion of the blower case 11 of the hot air blower unit 4 to detect an outside air temperature to be sucked into the casing 1 and to control the controller 8 based on the detected temperature. It is also possible to perform absolute control of the temperature of the discharged hot air similarly to the above embodiment.

〔The invention's effect〕

The method for controlling the temperature of the hot air in the hot air drying apparatus according to the present invention is configured as described above. (1) Since the temperature of the hot air is high in the initial stage of drying, the cold feeling received by the hand is eliminated and the usability is improved. I do.

(2) Since the air volume is small at the beginning of drying, water droplets attached to the hands are less scattered, and the walls and clothes are not stained.

(3) Since the temperature of the warm air is lowered in the latter half of the drying, the feeling of hotness received by the hand is eliminated, and the feeling of use is improved.

(4) Since an appropriate driving mode is automatically controlled according to the state of the user's hand, dissatisfaction due to individual differences can be eliminated.

And the like.

That is, the method of controlling the temperature of the hot air in the hot air drying device according to the present invention is based on the hand condition according to a preset program, in which the amount of hot air to be discharged toward the hand and the temperature of the hot air are set in advance. By changing it, the object of drying can be achieved in a short time without giving the user an extreme thermal sensation, and the effect of the present invention is extremely large.

[Brief description of the drawings]

FIG. 1 is a graph showing a temperature change on the surface of a hand when hot air is blown on a wet hand, and FIG. 2 is a configuration of a hot-air drying device for realizing a hot-air temperature control method according to the present invention. FIG. 3 is a flowchart illustrating an example of a control method of the apparatus, FIG. 4 is a timing chart illustrating an example of a control pattern of a controller, and FIG. 5 is a control of hot air temperature according to the present invention. FIG. 2 is a partially cutaway longitudinal sectional view showing a warm air drying device provided with the device. 4 ... Hot air unit 5 ... Sensor unit 8 ... Controller 9 ... Electric motor 10 ... Fan 13 ... Hot air outlet 14 ... Heater 15 Inverter 16 SSR 17 Temperature sensor 18 ... Radiation temperature sensor

Continued on the front page. (72) Inventor Kazutaka Ide 5-1-1, Kushimihigashi, Kokura-minami-ku, Kokura-minami-ku, Kitakyushu-shi, Fukuoka Tochiki Koki Co., Ltd. 5-1-1, Kuchiamihigashi Togaku Kikai Co., Ltd. Kokura No. 2 Plant (58) Field surveyed (Int. Cl. ⁶ , DB name) A47K 10/48

Claims (1)

(57) [Claims] 1. A hot air drying device which senses a hand held over a predetermined position by a sensor and drives a fan and a heater to discharge hot air to the position of the hand, wherein the rotation speed of the fan is continuously variable. A controllable electric motor and a current variable unit capable of steplessly variably controlling a current supplied to a heater for heating air supply by the fan are variably driven and controlled by a controller. The surface temperature of the hand is detected by a temperature sensor, and the air volume and the temperature of a preset discharge temperature are controlled according to the detected surface temperature of the hand. Control method.