JPS6192206A - Snow melting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] "Industrial Application Field" The present invention relates to a device for melting snow on roads, etc. using groundwater or the like.

``Prior Art'' Snow melting equipment, which pumps water from groundwater or the like into piping under the road using a pump device and spews the groundwater above the ground from a nozzle installed in the piping, has been recognized for its effectiveness and is widely used.

Previously, groundwater pumps were operated manually when snowfall began, and then manually shut down when snowfall ended. Even if the snow had stopped falling at night, it was common practice to continue driving the train until the morning.

In addition, some models are equipped with snowfall detectors that automatically detect snowfall and automate the start and stop of the pump, but during operation, the pump discharge volume is always adjusted to the amount required at the time of maximum snowfall expected in advance. was being pumped up.

``The problem that the invention seeks to solve'' As a result, an excess of groundwater was being pumped up than was needed for snow melting. Therefore, power consumption was also more than necessary.

However, in recent years, excessive pumping has caused problems such as extremely low water levels in wells, depletion, salinization, and ground subsidence. Furthermore, the amount of electricity required to extract groundwater is enormous. Therefore, there is an increasing need for water and energy conservation in order to make effective use of groundwater.

An object of the present invention is to provide a snow melting device that prevents snow accumulation using the minimum amount of snow melting water.

[Structure of the invention]

"Means for Solving the Problems" The present invention provides a snow melting device that sends water to a melting/regular pipe using a pump device and sprinkles water from a nozzle of the pipe, which includes: a variable speed pump device; a means for detecting snowfall intensity; This snow melting device includes a control device that controls the rotational speed of a variable speed pump device according to an output signal of a snowfall intensity detection device.

"Operation" The rotational speed of the variable speed pump device is controlled in accordance with the output signal of the snowfall intensity detection means, and the variable speed pump device is operated in accordance with the snowfall condition, and the snow is melted using the minimum necessary amount of water.

"Example" The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is an overall diagram shown in a flow sheet. A deep well pump is submerged below the water surface J in the deep well l, and its discharge pipe is equipped with a pressure detector j for detecting the discharge pressure. The discharge pipe DA is connected to a water sprinkler pipe B placed under the road surface. The water sprinkling pipe 11C is equipped with a large number of nozzles so that groundwater sent to the ground is discharged and melts snow.

As a snowfall detector, the Snow Sensor T is installed at typical snowfall locations in the area where snow melting is to be carried out.It is equipped with an internal heater, and melted snow water accumulates at the bottom, causing snow to melt depending on the amount of snowfall. The water level of meltwater is changing,
It is equipped with an electrode that uses changes in the water level of the snowmelt water as electrical resistance, and the electrode is wired to the snow controller 9 of the output section. converts the current value into a voltage value and outputs it.

The output signal (DCO - 1oV) of the snow conditioner 9 is input to the signal control device //. The signal control device /l proportionally converts the output signal (0-/OV) of the snow conte according to the intensity of snowfall to the discharge pressure regulator l- (/-jV) so as to drive the inverter 13. In addition, it is proportional to the square of the output signal from the snow con 9 (t-tV).
In addition to being able to output a signal of () to jV) in proportion to the square root of the output signal from the snow conte, it also has the functions described below. It is also possible. That is, the signal control device // outputs an input signal from the snow conditioner as a control target value for the deep well pump, taking into account the performance of the deep well pump.

The discharge pressure regulator saw inputs the signal from the pressure detector S together with the signal from the signal controller 1/, and adjusts the discharge amount from the deep well so that the discharge amount corresponds to the target output signal (control target value) from the signal controller 1/. This is a device that calculates a signal that indicates the rotational speed of the pump saw for use in deep wells.The output signal is input to the inverter 13, and the inverter 13 outputs power at a frequency according to the signal from the discharge pressure regulator saw. It is designed to control the rotation speed of the pump motor.

In Figure 2, the snowfall intensity indicated by the snow sensor t to the right from the origin 0 is plotted on the horizontal axis, (kII/m2/hr), and
- The rotation speed of the deep well pump is taken from the origin to the left, and the snow conte output (0) is plotted upward from the origin on the vertical axis.
~/17V), the water sprinkling amount is taken downward from the origin, the output characteristic line of the snowfall intensity detection means consisting of the snow sensor t and the snow controller 9, the water sprinkling characteristic mtseibmi, the discharge amount for deep well pump -〇 rotation speed. A characteristic curve 1g is shown.

The operation of FIG. 1 will be explained below along with FIG. 2.

When the snow sensor t suddenly shows the snowfall intensity shown in Figure 1, the value at point C, where a line parallel to the horizontal axis cuts the vertical axis, is calculated from the point on the output characteristic line /p of the snowfall intensity detection means. The snow conte outputs, and the signal control device // is connected to the horizontal axis from point C (for example, a parallel line goes vertically down from the point d that cuts the watering characteristic line /j [the pump sighting speed at the point e that cuts the horizontal axis). A signal of the given control target value is output to the discharge pressure regulator saw.

When the water surface of deep well I is at the standard water level, the discharge pressure of K is output according to the control target, and the discharge pressure regulator saw corresponds to the control target value of signal controller 1/ and the output of pressure detector 3. Therefore, the deep well pump is operated at the pump rotational speed corresponding to the above point ・, and the discharge pressure detector 3 sends a discharge pressure signal to the discharge pressure regulator /-, but the discharge pressure regulator saw does not transmit the signal to the signal controller /l. Since the output corresponds to the control target value of
Reference numeral 3 outputs power at a frequency according to only the output signal of the control target value of the signal control device/I, and the deep well pump is operated. This relationship is illustrated at point g in FIG. 2, where the horizontal line from point f, where the perpendicular line of the point/twist cuts the speed characteristic curve/g of the pump, cuts the vertical axis.

When the water level at the water surface 3 of the deep well (deep well) is different from the standard water level, and the water level at the water surface 3 of the deep well is high, the discharge pressure detector S for the same rotary shaft dust of the deep well pump will be higher than when the water level is at the standard water level. It outputs a high pressure signal, and conversely, when the water level J of the deep well is low, the discharge pressure detector 5 outputs a lower pressure signal than when the water level is at the standard water level for the same rotational speed of the Impco for deep wells. do. Discharge pressure detector! The pressure signal in the discharge pressure regulator /- is the value of the discharge pressure when the deep well l is at the standard water level and the control target of the signal control device l when the discharge pressure regulator /- is controlled only by the output signal of the signal control device ii. The value of the output signal of the value and the value of the discharge pressure corresponding to the control target value are stored, and the actually detected discharge pressure and the discharge pressure at the stored standard water level are compared, and the output signal is output from the signal control device II. The discharge pressure regulator 1 adjusts the input signal to the inverter 13 so that the discharge pressure at the standard water level of the deep well 1 corresponds to the output signal of the inverter 13.

Therefore, the deep well pump always outputs a constant discharge pressure in response to the intensity of snowfall, and a constant flow rate of water is sprayed from the nozzle regardless of the water level K in the deep well I.

Watering characteristic curve/! Assuming that the standard outside temperature is used, for example, the average temperature during the watering period, the amount of groundwater required for snow melting will vary as the temperature rises and falls, even if the snowfall intensity is the same.

Therefore, although not shown in the figure, a temperature sensor is provided in the watering area, and the signal from the temperature sensor is automatically or manually adjusted to adjust the discharge pressure.
watering characteristic curve/A (reducing watering amount) by stratifying the temperature so that the amount of watering is increased or decreased according to the temperature.
, switch to the watering characteristic curve (increase watering amount). For example, the watering characteristic curve Noro assumes that the maximum value is constant and the snowfall intensity is O.
Signal control device proportional to the square root of the value from to the maximum /l
The output signal is obtained. The water sprinkling characteristic curve 1 obtains, for example, an output signal of the signal control device // in which the snowfall intensity is proportional to the square of the value from 0 to the maximum, with the maximum value being constant.

These external conditions can be adjusted, for example, by the temperature, and the amount of water sprinkled can be reduced by the number of cars passing by. A photoelectric switch or an ultrasonic oscillator (such as a photoelectric switch or an ultrasonic oscillator to catch reflected waves from automobiles) may be provided to provide a watering characteristic curve corresponding to the number of passing automobiles per unit time.

This makes it possible to melt snow with the minimum amount of water depending on external conditions.

When snow begins to fall, it is effective to sprinkle a large amount of water to measure the temperature rise of the road surface in order to prevent the road surface from becoming colder and remaining in the form of sleet for a while. As shown in Fig. 1, such a device is equipped with a maximum value target node /9 into which the output signal of the snow conte is input, and the first output signal from the snow conte is inputted using the adjustment part /9 as a timer. Then, the adjustment section 19 controls the signal control device // to output an output signal (3V) of the maximum control target value from the signal control device // for a predetermined period of time, thereby increasing the maximum speed of the deep well pump. drive for a certain period of time. As a result, the temperature of the road surface increases, making it easier to melt snow later.

Even when snow has stopped falling, roads can become icy.

Therefore, even if the snowfall intensity becomes 0, it is necessary to operate the deep well fumpco so that it can discharge at the target value at the minimum value, which is slightly larger than the minimum discharge amount. The control unit is equipped with a minimum target value adjustment unit that operates in response to a downward signal, and the adjustment unit is a signal control device so as to output a control target signal (/V) for operating the deep well pump at the minimum speed. / is controlled for a predetermined period of time or until the next snowfall.

Same, maximum value target value adjustment section 19, minimum value target value adjustment section 21
may be located within the signal control device /' /.

The signal control device // may have the following functions. That is, in places where there are many cars passing by, or when it snows for an hour or when the temperature is sufficiently high, the level of the output signal of the snow conditioner is set in advance according to the intensity of the snowfall based on the signal from the external condition detection means described above. When the level is above a predetermined value, it operates and starts outputting, and when the level is below a predetermined value, it stops outputting. By doing so, it is possible to prevent waste of groundwater during watering even when the snow is melting without watering.

Furthermore, it is possible to prevent inching of a deep well pump during snowfall with short intermittent intervals.

When the snowfall intensity exceeds such a predetermined snowfall intensity, the signal control device // should have a function to output a preset constant value as a control target value within a predetermined time, and thereafter operate according to the snowfall intensity. I can do it. Also, when the intensity of snowfall exceeds a preset value, the signal control device // outputs an output signal from the signal control device 1// within a predetermined time, using a predetermined constant value as the control target value. After the remaining snow melts, the deep well pump is operated on a timer.
Eliminates the signal output from the

〔Effect of the invention〕

Since the present invention is provided with a control device that controls the variable speed pump device according to the output signal of the snow resistance strength detecting means, water is sprinkled according to the snowfall strength, so that the amount of ground water intake can be significantly saved. In addition, because the amount of groundwater taken is small, power consumption is low.

FIG. 3 is a diagram showing the relationship between time on the horizontal axis and electric energy or amount of water pumped by a deep well pump (sprayed water amount) on the vertical axis. In the conventional example, as shown by reference numeral 3, the discharge amount is constant at the maximum discharge amount of the pump. In the present invention, the discharge amount has a curved shape indicated by the symbol Koda, and the shaded part represents the amount of groundwater and electricity saved (assuming that it is simply proportional to the discharge amount).
As shown in the figure, the horizontal axis shows the amount of water used and the vertical axis shows the power consumption. When the amount of water used is the same, the conventional example shows 8 curves for discharge valve control, and the present invention controls the pump rotation speed as shown in curve A. This results in significant power savings.

In the present invention, since the pump discharge pressure is detected and the pump discharge amount is maintained in accordance with the amount of snow melting, the amount of water sprinkled does not change even if the underground water level fluctuates.

As shown in the first embodiment, the present invention is equipped with a control device that incorporates environmental conditions into the snowfall intensity, so it has a wide range of selection and adjustment according to the well, snow amount, traffic volume, etc.a) Maximum flow rate b) Minimum flow rate can be adjusted C) Flow rate change can be selected in 3 stages d) Operation can be performed at a large flow rate when starting e) Operation can be performed at a constant flow rate after stopping.

[Brief explanation of the drawing]

Fig. 7 is a flow sheet of an embodiment of the present invention, and Fig. 2 is a flow sheet of an embodiment of the present invention.
3 and 3 are diagrams that compare the effects of the present invention and the conventional example. L...Deep well Co...Pump for deep well J...Water surface Da...Discharge pipe!・・Pressure detector 6・e Watering pipe 7・
・Nozzle g 11m Snow sensor 9--Snow con //,-Signal control device Saw...Discharge pressure regulator
13... Inverter /II... Output characteristic line of snowfall intensity detection means /3... Watering characteristic line /6... Watering characteristic line /7... Watering characteristic line /f... Speed characteristic curve of pump
/9...Maximum value target value adjustment section ``Minimum value target value adjustment section. Patent applicant: Ebara Corporation Ebara Electric Co., Ltd.

Claims (1)

[Claims] 1. In a snow melting device that sends water to a snow melting pipe using a pump device and sprinkles water from a nozzle of the pipe, a variable speed pump device, a snowfall intensity detection means, and an output of the snowfall intensity detection means A snow melting device equipped with a control device that controls the rotational speed of a variable speed pump device according to a signal. 2. Pump discharge pressure detection means, a signal control device that receives the output signal of the snowfall intensity detection means and outputs a signal corresponding to the snowfall intensity as a control target value, and a control target value of the signal control device and discharge pressure detection means A calculation device that inputs the pressure signal detected by the signal controller, calculates a pump rotation speed signal to obtain a pump discharge pressure corresponding to the control target value outputted by the signal control device, and outputs the signal to the variable speed pump device. The snow melting device according to claim 1, further comprising a control device that controls the rotational speed of the variable speed pump device in accordance with the output signal of the detection means. 3. The snow melting device according to claim 2, comprising a signal control device that outputs a signal proportional to the snowfall intensity, a signal proportional to the square of the snowfall intensity, and a signal proportional to the square root of the snowfall intensity as control target values. . 4. The snow melting device according to claim 1, further comprising a signal control device in which the control target value is automatically selected based on a detection signal of a means for detecting conditions such as outside air temperature that affect the snow accumulation outside. 5. A signal control device having a maximum value target value output unit that outputs the control target value when the output signal corresponding to the snowfall intensity is at the maximum value for a predetermined time when the output signal of the snowfall intensity detection means starts to be output. A snow melting device according to claim 2. 6. Equipped with a signal control device having a minimum value target output unit that outputs a control target value when the output signal corresponding to the snowfall intensity is the minimum value for a predetermined time when the output signal of the snowfall intensity detection means stops. A snow melting device according to claim 2. 7. Signal control that outputs a control target value when the level of the output signal of the snowfall intensity detection means is above a preset value, and stops outputting the control target value when the level is below a preset value. A snow melting device according to claim 2, comprising a snow melting device. 8. Output a preset value as a control target value within a predetermined time at the beginning of outputting the signal,
8. The snow melting device according to claim 7, further comprising a signal control device that outputs a control target value in accordance with the output signal of the snowfall intensity detection means. 9. Output a preset control target value within a predetermined time when the level of the output signal of the snowfall intensity detection means becomes less than a preset value;
The snow melting device according to claim 7, further comprising a signal control device that stops the output after that.