JP2607695B2 - Automatic snow melting equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic snow melting apparatus for melting snow on a snow plate.

[Conventional technology]

Conventionally, a snow melting apparatus of this type includes a temperature detector 11 for detecting an outside air temperature, a temperature detection circuit 1 for receiving the signal, a snowfall detector 10 and a snowfall detector 6 for receiving the signal, as shown in FIG. It comprises a logic element 14 for outputting a logical product of the outputs from the temperature detection circuit 1 and the snowfall detection circuit 6, a time delay circuit 18, and an output circuit 9. As shown in FIG. 6 (a), the snowfall detector 10 has two conductive snow-receiving plates 21 arranged at a predetermined interval, and further through a signal line 23 to a detection circuit 6 (not shown) at a later stage. It is connected. As shown in FIG. 1B, a heater 22 is provided below the snow plate 21. In the above configuration, the snowfall or snowfall on the snow receiving plate 21 is melted by the heater 22, and the change in impedance caused by the penetration of the dissolved water between the snow receiving plate 21 and the snow receiving plate 21 is represented by the connection line 23. Is to be detected via

By detecting the change in the impedance and the predetermined temperature by the temperature detector 11, for example, if a decrease in the impedance is detected below the predetermined temperature, it is detected that a snowfall state has occurred, and the snowfall state continues continuously while the snowfall state continues. It can be output. Tohoku Electric Power Co., Inc. from 1985
Has implemented a second electricity contract for snow melting. The outline of this agreement is to suspend the power supply for 2 hours during the whole year except for the winter season, and there is a customer benefit of discounting the price.

In contrast to the contract described above, the conventional apparatus shows that the snow on the snow receiving plate 21 during which the power supply has been stopped will remain in a bridge form as shown in FIG. ,
Since it is impossible to detect the subsequent snowfall, it is necessary to increase the capacity of the heater 22 in order to melt the snow on the snow receiving plate 21 during the power supply stop. This type of apparatus is described in Journal of the Japan Society of Snow Engineering: 1987, Vol. 4, PP43-48 and Tohoku Electric Power Research Research Bulletin No. 59, PP69-78.

[Problems to be solved by the invention]

The above prior art does not consider reduction of heater power consumption, so that there is a problem of increasing power. In addition, the output does not consider the snow melting state of a road parking lot or the like. There was a problem with the effectiveness of power consumption.

The present invention has been made in view of the above problems, and has been made to reduce the power consumption of a snow melting heater on a snow receiving plate, and to reduce the amount of water sprayed to a snow melting area and the amount of power supply.

[Means for solving the problem]

The above-mentioned object is to continuously supply electricity to the snow melting heater for melting the snow on the snow receiving plate for a predetermined time after turning on the power, including re-turning on after the power supply is stopped. A control circuit that intermittently energizes, or a control circuit that includes a plurality of heaters and energizes all heaters for a predetermined time after power-on, and then energizes only with a predetermined heater, or the first output is continuous after power-on Thereafter, the present invention is achieved by an automatic snow melting apparatus having a control circuit that outputs a signal at a predetermined duty even if snowfall continues.

[Action]

With the above configuration, after the power is turned on, the heater is continuously energized, so that the snow on the snow receiving plate during the power supply stop is quickly and reliably melted. Thereafter, since the heater is intermittently energized, the power consumption to continuously melt the snow becomes the minimum value, and the power can be reduced. Also, after the snowfall is detected, the first output is performed continuously, so that the snowmelt in the snowmelted area is performed promptly and reliably, and thereafter, even if the snowfall condition continues, the snowmelt is output intermittently. Sprinkling power can be reduced. Even if there is snowfall after the snow melts, it is difficult to snow.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a heater energizing circuit of an embodiment of the automatic snow melting apparatus according to the present invention. A temperature detector 11 and a temperature detection circuit 1 for obtaining its output, and its output or the output of a duty determination circuit 2 determined by a preset value are used as one input of the OR element 15, and the power-on detection circuit 3 The other input of the OR element 15 is provided via the delay circuit 4, and the output of the OR element 15 is provided to the heater via the output circuit 5.

Next, the operation will be described with reference to the waveform diagram of FIG. The waveform symbols in FIG. 2 correspond to the symbols in the respective parts in FIG.

Now, the H level of the waveform A is output from the power-on detection circuit 3 when the power is turned on, and the H level output shown by the waveform B is output from the delay circuit 4 from the time of the power-on until a predetermined time td.
On the other hand, the duty determination circuit 2 determines the duty according to a signal from the temperature detector 11 or to a preset value and outputs it as a waveform C. Thus, the heater is energized with the duty of the waveform D. The energization by the duty is performed by cycle control or phase control. Since a general method is known, the details thereof are omitted. Accordingly, the temperature of the snow plate is as shown by a waveform E shown in FIG.

According to the present embodiment, it is possible to quickly and reliably dissolve the snow on the snow plate during the power suspension period, and to reduce the power consumption of the heater and extend the service life of the heater thereafter.

Another embodiment will be described. FIG. 3 shows a block diagram of a heater energizing circuit of another embodiment. Snowfall detection circuit 6,
The temperature detection circuit 1, the AND element 14, and the time delay circuit 18 are the same as those described above, and a description thereof will be omitted. One of the outputs of the AND element 14 is input to one input of the OR element 16 and the other is input to the time delay circuit 7. The duty determination circuit 8 receives the output of the time delay circuit 7 and is connected to another input of the OR element 16 via the NOT element 17. The OR element 16 is input to the output circuit 9.

Next, the operation will be described with reference to FIG. The waveform symbols in FIG. 4 correspond to the symbols in the respective parts in FIG. Temperature detection device 1
As shown in a waveform G, the output changes from the L level to the H level, and reaches a predetermined temperature or less, that is, a low temperature at which the snow falls, and then the snow detection circuit also shifts from the L level to the H level, that is, the presence of rain as shown by the waveform F. Then, the AND element output H becomes H level, the time delay circuit 7 activates the duty determination circuit 8 after a predetermined time td, and inputs the waveform K to the other input terminal of the OR element 16. Therefore, the output of the OR element 16 is continuous at the beginning of the output like the waveform L, and thereafter intermittently output at a predetermined duty. According to this embodiment, once the snow melts, the output is intermittent, so that energy saving is realized.

Still another embodiment will be described with reference to FIG. FIG. 5 shows a snowfall detector provided with a plurality of heaters 22a and 22b. When the continuous energization is performed in the above-described embodiment, both heaters 22a and 22b are energized.
It energizes only a. According to this embodiment, it is possible to quickly and surely melt the snow cover on the snow plate during the power suspension, and to reduce the power consumption thereafter.

In each of the above embodiments, the predetermined energization duty of the heater can be determined by cycle control or phase control by a semiconductor switching element.

〔The invention's effect〕

With the implementation of the present invention, the snow on the snow receiving plate is quickly and reliably melted, and the power consumption is reduced by intermittently supplying power to the heater.
The resource and energy saving effects, that is, the effects of saving groundwater for watering and reducing the power for heaters, are enormous.

[Brief description of the drawings]

FIG. 1 is a block diagram of a heater circuit of one embodiment of an automatic snow melting apparatus according to the present invention, FIG. 2 is a waveform diagram of FIG. 1, and FIG. 3 is a block diagram of a heater circuit of another embodiment of the present invention. 4 is a waveform diagram of FIG. 3, FIG. 5 is a plan view of still another embodiment of the present invention, FIG. 6 is a plan view (a) and a side view showing the configuration of a snowfall detector, FIG. FIG. 1 is a block diagram of a conventional heater circuit, and FIG. 8 is an explanatory diagram of a conventional snowfall detector. DESCRIPTION OF SYMBOLS 1 ... Temperature detection device, 6 ... Snowfall detection circuit, 10 ... Snowfall detector, 11 ... Temperature detector, 13 ... Automatic snow melting device.

Claims (4)

(57) [Claims] 1. A snowfall detecting means for detecting dissolved water content of snow on a snow receiving plate and a means for measuring an outside air temperature, wherein the snowfall detecting means detects moisture and when the outside air temperature is below a predetermined level, a heater is provided. In an automatic snow melting device that issues an output command to an energizing circuit, the heater is continuously energized for a predetermined time after power-on,
An automatic snow melting apparatus characterized by having a control circuit for supplying electricity at a predetermined duty thereafter. 2. The control circuit according to claim 1, further comprising a control circuit for determining an energization duty of said heater based on an outside air temperature.
Automatic snow melting apparatus as described. 3. An automatic snow melting apparatus according to claim 1, further comprising a control circuit for outputting the first output after detecting the snowfall continuously and at a predetermined energization duty even if snowfall continues thereafter. 4. The automatic snow melting apparatus according to claim 1, further comprising a control circuit including a plurality of heaters, and energizing all the heaters for a predetermined time after the power is turned on, and thereafter energizing only the predetermined heater. apparatus.