JPS6195238A - Snowfall sensor - Google Patents

Abstract

PURPOSE:To accurately detect the amount of snowfall, by detecting the change in the heat capacity of snow receiving plate caused by snow by a thermoscope. CONSTITUTION:A switch 5 is preliminarily closed and atmospheric temp. is fallen when snow falls and the latent heat is taken from a snow receiving plate 1 by snow (a) and, when the temp. of the snow receiving plate 1 reaches 10 deg.C or less, a thermoscope 4 is closed and a snowfall display lamp 7 is lighted. A thermoswitch 3 is also closed to supply a current to a heater 2 and the snow receiving plate 1 is heated. When snow holds up, the temp. in the vicinity of the switch 3 reaches 20 deg.C and the switch 3 is closed and the supply the current to the heater 2 is stopped. The thermoscope 4 is opened before the supply of a current is stopped and a snowfall display lamp 7 is put out. This operation is performed because the heater 2 is present in one side of the snow receiving plate 1 and the thermoscope 4 is positioned so as to be nearer to the heater 2 than the thermoswitch 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a snowfall sensor that detects snowfall by applying changes in the amount of heat of a snow receiving plate.

[Conventional technology and m points in between]

Conventional snowfall sensors include electrode systems and infrared systems.

In the electrode method, falling snow is melted by a heater, and this snow melting is detected by electrodes at both poles. In this electrode method, the heater is always operated to melt snow, or the outside temperature is measured and the heater is operated when the temperature falls below the set temperature.

However, the electrode method has the disadvantage that it malfunctions when there is a small amount of snowfall. This is because there is a small amount of snowmelt water during snowfall.

The infrared system has a light-emitting side and a light-receiving side, and if it snows between the two, the infrared light is blocked and snowfall is detected.

However, the infrared method has the disadvantage that it is too difficult to detect when the amount of snowfall is small.

As mentioned above, conventional snowfall detectors have the drawback of not being able to handle small amounts of snowfall.

[Means for solving problems]

The present invention is a snowfall sensor comprising a snow catcher having a certain heat capacity, a heating means for heating the snow catcher, and a temperature measuring device provided on the snow catcher.

[Effect]

Combined with the outside temperature, the snow that accumulates on the snow board lowers the amount of heat on the snow board, and a thermometer detects the drop in temperature due to this decrease in heat, and detects snowfall.

Further, the heating means applies heat to the snow receiving board whose heat value has decreased due to snowfall.

〔Example〕

As shown in Fig. 1 and Fig. 2, an electric heater 2 is provided on one side of a snow catcher 1 made of a metal with good thermal conductivity such as aluminum or stainless steel and has a certain heat capacity. The snow catching board 1 is controlled by a thermoswitch 3 such as a thermistor or bimetal installed on the other side of the snow catching board 1 to maintain a constant temperature. This thermo switch;
A temperature measuring device 4 such as a bimetal is attached to one side of the snow catching board 1.A groove 1a is formed in the snow catching board 1, and an electric heater 2 is buried in the snow catching board 1.

In other words, the snow catch plate 1 has a constant r and a capacity C''= mc (where m is the mass and C is the specific heat) (-1). Provided for.

Further, the electric heater 2 is connected in series with a switch 5, an AC power source 6. The thermoswitch 3 is connected. Furthermore, a snowfall indicator lamp 7 and an AC power source 6 are provided in series with the thermometer 4. When eating, close FZ constant temperature of thermo switch 3 at 1o0c, 20℃
The thermometer 4 is made of a thermistor, bimetal, etc., and is set to close at 10°C and open at 20°C.

If switch 5 is closed and it snows, the outside temperature will drop,
The heat of the snow receiving board 10 is taken away by the snow a, and as a result, when the temperature of the snow receiving board 1 falls below 10'C, the thermometer 4 closes and the snowfall indicator lamp 7 lights up. Further, the thermo switch 3 is also closed to supply power to the heater 2. The snow receiving plate 1 is heated by this power supply, and when the snow stops being removed, the temperature near the thermo switch 3 is 2.
When the temperature reaches 0° C., the thermoswitch 3 is opened and power supply to the heater 2 is stopped. Before this power supply is stopped, the thermometer 4 is opened,
The snowfall indicator lamp 7 is turned off. This is because the heater 2 is located on one side of the snow catcher 1, and the temperature detector 4 is located closer to the heater than the thermoswitch 3 is.

Therefore, even if the amount of snowfall is small, the heat capacity of the snow catcher 1 changes due to a small amount of snow, and the temperature change, which is a change in heat capacity, is measured by temperature measurement t? r 4 'Thus, snowfall can be detected.

In addition, instead of the snowfall indicator lamp 7, it can be connected to the control unit of the lightning extinguisher (not shown) to activate a lightning extinguishing device such as a lightning extinguishing vibrator when it snows, and conversely, automatically activate the lightning extinguisher when the snow stops. It also comes with a mouth to stop. Further, although the shape of the snow catcher plate 1 is shown as a rectangle in the embodiment, it may also be in any shape such as a circle.

[Effect of birth]

This invention consists of a snow catcher having a certain heat capacity, a heating means for heating the snow catcher, and a thermometer installed on the snow catcher, and even if the amount of snowfall is small, the snow Therefore, the heat capacity of the snow receiving board changes, and snowfall can be detected by the temperature measuring device based on the change in heat capacity, so snowfall can be detected more accurately than conventional snowfall detection.

Further, by providing a heating means, it is possible to always detect fresh snow.

Furthermore, since it is easier to purchase than conventional products, there are fewer causes of failure. Also, since it is not affected by the direction of snowfall,
Accurate detection is always possible.

[Brief explanation of the drawing]

FIG. 1 is a front view, and FIG. 2 is a perspective view. 1. Snow board 2. Heater 4. Thermometer a. Snow

Claims (1)

[Claims] A snowfall sensor comprising a snow catcher having a certain heat capacity, a heating means for heating the snow catcher, and a temperature measuring device provided on the snow catcher.