JP5722717B2 - Operation control device for snow melting equipment - Google Patents

Description

  The present invention relates to an operation control device for a snow melting device that sends water pumped up from a water source such as a deep well to a watering pipe, sprays water from the watering pipe to a snowfall surface such as a road or a parking lot, and melts the accumulated snow. .

  Groundwater is constant temperature around 10 ° C throughout the year. Therefore, a snow melting device that melts the snow that has been pumped up from the ground by using a pump has been known for a long time. In recent years, for the purpose of saving water and electricity, an operation control device for an intermittent operation type snow melting device using complex control has been developed by combining an optical snowfall sensor and a computer. Especially in the snow melting of public facilities, advanced and fine control technology is used.

  As an example, there is an operation control device for a snow melting device disclosed in Patent Document 1. In this operation control device, the traffic volume in the time zone is incorporated into the determination condition, or the activation frequency is limited by the capacity of the operation pump.

  Moreover, the snowfall sensor used for the operation control apparatus of these snowmelters can determine the snowfall intensity with high accuracy by capturing snowflakes that fall on a wide, high-performance surface. Since the target of the snow melting device used for public facilities is mainly a wide snow melting area such as a main road, it is necessary to accurately determine the snowfall intensity and to control the operation of the snow melting device based thereon. On the other hand, there are relatively narrow areas subject to snow melting, such as suburban restaurants, parking lots for mass retailers, office buildings, and parking lots for commercial buildings.

  In these snow melting devices used for snow melting in a relatively small area, private customers are mainly end users. The snow melting device required by these customers is a snow melting device that has a reliable snow melting function at an economical price that is easy to purchase.

JP 2009-97152 A

  As mentioned above, snowmelt equipment for public facilities can measure snowfall intensity with high accuracy using a high-performance snowfall sensor, and in addition to snowfall intensity, conditions such as outside air temperature and traffic volume according to time zone, It is controlled with detailed operating conditions. Furthermore, the limit of the activation frequency is changed depending on the motor capacity of the large pump from the small pump, and it is an advanced device. In particular, this high-performance snowfall sensor is an expensive device because it can directly count snowflakes in a wide snowfall area with an infrared reflection method and accurately determine the snowfall intensity at that time.

  On the other hand, the snow melting device for private facilities is small because it melts snow in a relatively small area, and the number of devices installed is large, and the price cannot be set high. In addition, from the viewpoint of environmental protection, a snow melting device for private facilities will be required in the future.

  The present invention has been made in view of the above points, and without using an expensive and high-performance snowfall sensor, it is possible to make a highly accurate determination using a general-purpose snowfall sensor with a narrow detection area and a relatively low price. An object of the present invention is to provide an operation control device for a snow melting device that can reliably melt snow while saving electricity.

In order to solve the above problems, the present invention is an operation control device for a snow melting device comprising a water sprinkling pipe and a pump, sending water pumped from a water source by the pump to the water sprinkling pipe, sprinkling water on a snowfall surface and melting snow. A snow melting device comprising: an optical snowfall sensor that counts snowflakes passing through a predetermined horizontal plane area; and an operation control unit that controls the operation of the pump based on the snowflake count counted by the optical snowfall sensor. In the operation control device of the apparatus, the operation control unit obtains an SP value, which is a threshold value for determining whether the pump is continuously operating in heavy snow or intermittent operation, by using the following formula, and the SP value is a predetermined value: In the above case, it is determined that there is heavy snow, and if it is less than the predetermined value, it is determined that the snow is light .
SP = A × ((T _P / T _F ) ^B )
Here, T _F is the predetermined time before time determines snow-Koyuki from snowflakes count number counted by the optical snowfall sensor, T _P denotes each pump operating time in the time T _F, A is The coefficient can be arbitrarily set, B is a coefficient that can be arbitrarily selected, and A> B.

Further, according to the present invention, in the operation control device for the snow melting device, the coefficient A of the formula for obtaining the SP value is a value set within A = 1 to 500, and the coefficient B is B = 0.1-1. It is a value set in .5.

Further, the present invention is the operation control device of the snow melting apparatus, the operation control unit, once the basic start-stop time in the case of the intermittent operation and T _B, the T _B is the breakdown basic pump operating time T _PB , the basic pump stop time is T _PS (T _PB + T _PS = T _B ), and the ratio of the basic pump stop time T _{PS to} the basic pump operation time T _{PB according} to the outside air temperature is determined when the outside air temperature is low. Small and large when the outside air temperature is high.

Further, the present invention is the operation control device of the snow melting apparatus, the single basic start-stop time T _B in the case of intermittent operation is T _B = 15 min, the basic pump operation time T _PB = 8 minutes The basic pump stop time is T _PS = 7 minutes.

Further, the present invention is the operation control device of the snow melting apparatus, wherein the intermittent operation time change by ambient temperature of the operation control unit, the coefficient 0.5 in the basic pump stopping time T _PS in the outside air temperature is less than 0 ℃ Multiplying 0.5 T _PS as the pump stop time, T _B −0.5 T _PS as the pump operation time, and when the outside air temperature is 0 ° C. to 1.5 ° C., a factor of 0.8 is added to the basic pump stop time T _PS. the 0.8 T _PS multiplied by the pump stop time, the T _B -0.8T _PS was the pump operating time, T _PS multiplied by the coefficient 1 in the basic pump stopping time T _PS is further outside air temperature 1.6 ° C. or higher and pump stop time, characterized in that the T _B -T _PS pump operating time.

In the snow melting device, the deep well pump has a limit on the activation frequency per unit time (60 minutes). For example, 7.5 kw or less = 12 times / h, 11 kw to 22 kw = 6 times / h, 26 kw = 4 times / h, and so on. Further, based on the fact that the pump capacity to be used is not specified and the experience so far, the predetermined time before judging heavy snow / light snow is 60 minutes, and the interval (basic start / stop time T _B ) is 15 minutes. Therefore, the interval (basic start / stop time T _B ) is not limited to 15 minutes.

  In addition, the method for determining the outside air temperature is usually the Niigata and Hokuriku areas where the present snow melting system is mainly used, and the outside air temperature during the season is the most snowfall condition of 0 ° C to 1.5 ° C. Based on past experience, it is preferable that the water saving and power saving rate be around 30% under these conditions. Since it is difficult to melt below 0 ° C, the operation time is lengthened, and it is easy to melt above 1.6 ° C. Driving time is shortened. Therefore, the pump operation time depending on the outside air temperature is not limited to the above example.

  According to the present invention, the operation control unit determines whether the continuous operation or the intermittent operation of the pump is based on a threshold value (SP value) that determines whether the operation is continuous or intermittent depending on the length of the operation time immediately before the pump. ) Can be changed, so that it is possible to reliably melt the snow falling on the snowfall surface even if an inexpensive general-purpose snowfall sensor is used without using a high-performance luxury snowfall sensor as a snowfall sensor. Can provide. In addition, the watering pump during snow melting can be operated intermittently to limit the amount of water used in the well water, and the power consumption of the pump can be reduced, providing a snow melting device that is friendly to the global environment.

It is a block diagram which shows the concept of the snow melting apparatus which concerns on this invention. It is a figure which shows the structural example of a high-grade snowfall sensor. It is a figure which shows the structural example of the general purpose type snowfall sensor used for the snow melting apparatus which concerns on this invention. It is a figure which shows the comparative example of the number of snowfall pulses of a high-grade snowfall sensor and a general-purpose snowfall sensor. It is a block diagram which shows the whole schematic structure of the snow melting apparatus which concerns on this invention. It is a figure which shows the driving | running condition (the 1) of the pump of the operation control apparatus of the snow melting apparatus which concerns on this invention. It is a figure which shows the driving | running condition (the 2) of the pump of the operation control apparatus of the snow melting apparatus which concerns on this invention. It is a figure which shows the driving | running condition (the 3) of the pump of the operation control apparatus of the snow melting apparatus which concerns on this invention. It is a figure for demonstrating the interval at the time of pump operation of the operation control apparatus of the snow melting apparatus which concerns on this invention. It is a figure for demonstrating the interval at the time of a pump stop of the operation control apparatus of the snow melting apparatus which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a block diagram showing the concept of a snow melting device according to the present invention. As will be described later in detail, an optical sensor is used as the snowfall sensor, and snowflakes passing through a horizontal surface of a predetermined area as a snowflake detection area are counted, and the snowfall intensity is determined based on the count number of the snowflakes. In a high-precision snowfall sensor with high accuracy capable of determining the snowfall intensity, the area of the snowflake detection area 3 (see FIG. 2) is large, and snowflakes passing through the snowflake detection area 3 having a large area are captured and counted. On the other hand, the area of the snowflake detection area 7 (see FIG. 3) of the relatively inexpensive general-purpose snowfall sensor is small (narrow), and the number of snowflakes passing per unit time during snowfall is very small. The number of counts is also small. Naturally, when determining the snowfall intensity in a short time, it is possible to determine the snowfall intensity more accurately by capturing the snowflake passing through the large snowflake detection area.

  If the number of snowflakes passing through the snowflake detection area in the unit time (interval time) is equal to or less than a predetermined value, the pump does not start or the pump in operation is stopped. If the count of the snowflakes exceeds a predetermined value, the pump is started, and the pump is operated continuously or intermittently according to past snowfall intensity (heavy snow, light snow), outside air temperature factor (operation time, etc.) Judge whether to do. Furthermore, the operation time or stop time of intermittent operation is determined by the outside air temperature, and the pump is started. Here, there is provided a snow melting apparatus that can melt snow reliably while performing water saving and power saving although it is aimed at melting snow in a relatively narrow region.

  FIGS. 2 and 3 are diagrams showing a configuration example of the snowfall sensor, FIG. 2 shows a configuration example of the high-grade snowfall sensor, and FIG. 3 shows a configuration example of the general-purpose snowfall sensor. Here, the size of the snowflake to be detected is a snowflake having a diameter of 2 mm or more.

The high-grade snowfall sensor 1 includes an optical sensor 2 and a snowflake detection area 3. The snowflake detection area 3 is a horizontal plane area through which snowflakes pass during snowfall. The snowflake detection area 3 has an area of about 1200 cm ² with a vertical dimension L1 = 60 cm, a horizontal dimension L2 = 20 cm, and a thickness dimension L3 = 1 cm, as shown in FIG. Snowflakes having a diameter of 2 mm or more passing through the horizontal plane area are detected by the optical sensor 2 and the number is counted (measured). The interval L4 between the optical sensor 2 and the snowflake detection area 3 is the dead zone L4 = 20 cm.

The general-purpose snowfall sensor 5 includes an optical sensor 6 and a snowflake detection area 7. The snowflake detection area 7 is a horizontal plane area through which snowflakes pass during snowfall. The snowflake detection region 7 has an area of about 10 cm ² with a vertical dimension L1 = 10 cm, a horizontal dimension L2 = 1 cm, and a thickness dimension L3 = 1 cm, as shown in FIG. Snowflakes having a diameter of 2 mm or more passing through the horizontal plane area are detected by the optical sensor 6 and the number thereof is counted. The interval L4 between the optical sensor 6 and the snowflake detection area 7 is a dead zone L4 = 1.5 cm.

  4 shows a comparison example of the number of snowfall pulses (the number of snowfall snowflakes) at the same time and at the same place using the high-grade snowfall sensor 1 having the configuration shown in FIG. 2 and the general-purpose snowfall sensor 5 having the configuration shown in FIG. FIG. 4A shows the number of snowfall pulses of the high-grade snowfall sensor 1, and FIG. 4B shows the number of snowfall pulses of the general-purpose snowfall sensor 5. As is clear from the number of snowfall pulses shown in FIGS. 4A and 4B, the general-purpose snowfall detection region 7 having a small snowfall pulse number of the high-grade snowfall sensor 1 having the snowfall detection region 3 having a large area is provided. The number of snowfall pulses of the type snowfall sensor 5 is overwhelmingly larger. However, the absolute amount of the number of snowfall pulses is higher in the high-grade snow sensor 1, but the high-grade snow sensor 1 and the general-purpose snow sensor 5 are substantially similar in the detection tendency of snowfall at the beginning and end of snowfall and during snowfall. Thus, it has been found that by devising the control method, it is possible to construct a snow melting device that can reliably melt snow using the general-purpose snowfall sensor 5 without using the high-grade snowfall sensor 1.

  Therefore, here, there is provided an operation control device for a snow melting device that uses the relatively inexpensive general-purpose snowfall sensor 5 having the configuration shown in FIG. 3 and can melt snow relatively accurately and reliably. FIG. 5 is a block diagram showing an overall schematic configuration of the snow melting device according to the present invention. This snow melting device includes a general-purpose snowfall sensor 5, a pump control panel 100, a watering unit 200, and a water source unit 300. The pump control panel 100 includes a pump operation control circuit unit 101 and a control unit 102.

  The pump operation control circuit unit 101 is supplied with AC power from an AC power source (commercial power source) through the leakage breaker 10, and the deep well submersible pump is connected via the electromagnetic switch 11 of the pump operation control circuit unit 101. The drive current can be supplied to the motor M 51. An overcurrent protector 14 having a 3E relay is provided so that no overcurrent flows through the motor M.

  The pump control panel 100 includes a snowfall determination unit 21, a monitor unit 22, an alarm unit 23, an operation selection unit 25, a pump unit 26, and a control selection unit 27. As shown in the figure, the water sprinkling unit 200 includes a water sprinkling pipe 41 buried under a snowfall surface 40 such as a parking lot, for example, and a plurality of water sprinkling nozzles 42 are provided in the water sprinkling pipe 41, The opening to be ejected is disposed so as to be exposed on the snowfall surface 40.

  In the water source unit 300, a deep well submersible pump 51 including a pump P and a motor M is installed in the deep well 50. A discharge pipe 52 is connected to the discharge port of the deep well submersible pump 51, and the discharge pipe 52 is connected to the water sprinkling pipe 41 through a check valve 53 and an open / close valve 54. By supplying water to 41, water W is ejected from a large number of watering nozzles 42 to the snowfall surface 40. As described above, driving power is supplied to the motor M of the deep well submersible pump 51 from the AC power source through the leakage breaker (ELB) 10 and the electromagnetic switch 11 provided in the pump operation control circuit unit 101. Yes. In the deep well 50, a drought level sensor 55 and an automatic return level sensor 56 for detecting a drought water level are arranged. L1 indicates the operating water level of the deep well 50.

  In the snow melting apparatus shown in FIG. 5, the snowflake count signal (count signal) detected by the optical sensor 6 (see FIG. 3) of the general-purpose snowfall sensor 5 is input to the snowfall determination unit 21 of the control unit 102. The general-purpose snowfall sensor 5 is also provided with a snowfall temperature sensor that detects the snowfall temperature, and a snowfall temperature detection signal is also input to the snowfall determination unit 21. The snowfall judgment unit 21 detects snowfall, snowfall temperature, and snowfall intensity based on the signal from the general-purpose snowfall sensor 5, and outputs the detection signals to the operation selection unit 25.

  The display unit 29 includes a well drought display unit 29a for displaying when the water level of the deep well 50 is lowered and a drought state occurs, an operation / failure display unit 29b for displaying operation / failure, and a power supply display unit 29c. Is provided. The monitor unit 22 is provided with a display unit for operating current, power consumption / power amount, snowfall temperature, number of snowfall pieces, operation time, and pumping amount of the pump. The alarm unit 23 includes a well drought alarm unit for alarming drought when the drought level sensor 55 of the deep well 50 detects drought, and a pump failure alarm for alarming a pump failure when the pump (deep well submersible pump 51) fails. A low-load alarm unit for alarming a low-load operation of the pump, and a sensor abnormality alarm unit for alarming a sensor abnormality. The operation selection unit 25 selects an intermittent operation mode or a continuous operation mode based on a signal from the snowfall determination unit 21. The pump unit 26 is provided with an operation unit that receives the signal from the operation selection unit 25 and operates the pump, and a stop unit that receives the signal from the alarm unit 23 and stops the pump. The control selection unit 27 can select automatic operation or manual operation according to selection by the selection means 28.

  In the above-mentioned snow melting device, in the snow melting environment of the snow surface 40 during snowfall, the snow surface 40 is dry when there has been no snow for a while, and when snow begins to fall in such a situation, it is compared with the wet snow surface. Snow does not melt and becomes easy to pile up. It is more effective for melting snow to make it harder to snow the snow that has fallen in advance than to melt the snow that has snowed once with water. Further, in order to sprinkle groundwater on the snowfall surface by the deep well submersible pump 51 and create a uniformly wet state, continuous water spraying for a certain period of time or more is required.

  Therefore, here, a device has been incorporated into the control method to melt the snow that has fallen before it reaches the snow surface. First, the snowfall judgment unit 21 judges whether or not to operate the deep well submersible pump 51 based on the snowfall judgment value set to determine the start of the deep well submersible pump 51. Here, if it is determined that the pump is operating, then heavy snow / light snow is determined based on the count of snow pieces. The operation selection unit 25 selects continuous operation if the snowfall determination unit 21 determines heavy snow, and selects intermittent operation if it determines that the snow is light.

  From the state where the snow has stopped and the deep well submersible pump 51 is not operating, the snow falls and the snow determining unit 21 determines that it is snowing based on the count of the snowflakes, and the operation of the deep well submersible pump 51 starts. Time (for example, 15 minutes) is a continuous operation, and the dry road surface is kept wet. At this time, the number of snowflake counts for the predetermined time is integrated to determine whether there is heavy snow or light snow. When determining the operating conditions of the deep well submersible pump 51 from heavy snow or light snow, the past deep well submersible pump 51 (hereinafter referred to as necessary) is added to the determination condition whether or not the snowfall surface 40 is well wetted. In other cases, the operating condition of “pump” is simply added to the judgment value. In other words, the past operation time of the pump is added as a correction condition to a preset step determination value, and an equation that makes it easy to determine that the snow is heavy at the initial stage of operation and makes continuous operation easy is incorporated in the control system.

Formula for discriminating heavy snow / light snow, that is, corrected step determination value (threshold value): SP is expressed by equation (1).
_{SP = A × (T P /} T F) B ········· (1)
Here, T _F is a predetermined time (in this case, T _F = 60 minutes) before entering the step of determining heavy snow / light snow, and T _P is the number of pump operation hours (in minutes) within the predetermined time T _F. .

In the above formula (1), A is a numerical value that can be arbitrarily set, and generally, A = 1 to 500 is adopted. If it is desired to continuously operate the pump even during snowfall when the number of snowflakes to be discriminated (counted) is small, a small numerical value is set (assigned) to A. B can be arbitrarily selected, but is usually 0.1 to 0.5. T _P / T _F (= T _P / 60) which is a ratio value with respect to the pump operation time T _P (minute unit) during a predetermined time T _F (here, T _F = 60 minutes) before judging heavy snow / light snow Since the value of is always ≦ 1, if B is large, the SP value will be smaller, and it will be determined that there is heavy snow, and there will be more opportunities for continuous pump operation.

  A method of operating the snow melting device in which the above equation (1) is put into control will be described with reference to FIGS. FIG. 6 shows a pump operating condition (No. 1), FIG. 7 shows a pump operating condition (No. 2), and FIG. 8 shows a pump operating condition (No. 3). FIG. 9 shows an explanation of an interval of 5 minutes (min), and FIG. 10 shows an interval at the time of stopping.

  In the operation condition (part 1) of the pump in FIG. 6, the pump starts if the number of snowflake counts during the interval of 5 minutes (min) is 3 or more. As shown in FIG. 9, the interval is slid and calculated every 5 minutes. If the count of snowflakes for 5 minutes during an interval exceeds the set value for snowfall judgment, the bump is started. The started pump is initially operated continuously for 15 minutes as shown in step (3) of FIG. 6, and during this time, a threshold value SP that determines the operating condition of the next step (4) is calculated.

  In FIG. 9, the number of snowflakes in the first interval 5 minutes (the number of snowflakes) = 1, the number of snowflakes in the second interval = 0, the number of snowflakes in the third interval = 1, the number of snowflakes in the third interval = 1 The number of snowflakes in the fourth interval = 1, the number of snowflakes in the fifth interval = 2, and the number of snowflakes in the sixth interval = 3. Snowfall judgment at the sixth interval: Since there are three set values of PLS and three measured values, three PLS (set values) ≦ 3 (measured values), and the pump is started.

The pump operation time number T _P during the predetermined time T _F (here, T _F = 60 minutes) before the judgment of heavy snow / light snow in the equation (1) is continuous operation for 15 minutes after the start of the pump. Substitute T _P = 15 minutes into T _P of 1). The equation (1) to a constant A by substituting A = 50, B = 0.5 SP = A × a ^{_{(T P / T F) B}} = 50 × (15/60) 0.5 = 25PLS
Is obtained as the SP value which is the determination reference value. The count number of snowflakes in the interval (15 minutes) of step (3) is 29 PLS. Here, depending on whether the count of snowflakes in the interval of 15 minutes in step (3) is larger or smaller than the SP value as the determination reference value, it is determined that the snow is heavy and the pump is continuously operated, and if it is small, it is determined that the snow is light. The pump is intermittently operated. In this step (3), since the SP value (= 25 PLS) serving as the determination reference value <the snowflake count (= 29 PLS), it is determined that there is heavy snow, and the pump is continuously operated.

The pump operation time number T _P during a predetermined time T _F (T _F = 60 minutes) before judging heavy snow / light snow in step (4) in FIG. 6 is equal to 15 minutes of step (3) after starting the pump + It is 15 minutes of step (4), and T _P = 30 minutes. Here, when A = 50 and B = 0.5, the threshold value serving as the determination criterion is obtained from the equation (1). SP = A × (T _P / _TF ) ^B = 50 × (30/60) ^0.5 = 35 PLS
It becomes. Since the number of snowflake counts in step (4) is 30, the SP value (= 35 PLS) serving as the determination reference value> the count number of snowflakes (= 30 PLS), and the SP value serving as the determination reference value is the step. Since it is greater than the number of snowflake counts in (4), it is determined that the snow is light, and the pump is intermittently operated.

  The snow melting condition of the snowfall surface 40 is also affected by the outside air temperature. In other words, even if the amount of water is the same, the snow is not easily melted if the outside air temperature is low, and it is easy to melt if the temperature is high. Therefore, the operation time can be adjusted as a result by adjusting the pump stop time in the following three stages according to the outside air temperature.

(1) When the outside air temperature is less than 0 ° C, the stop time is multiplied by a factor of 0.5 (for example, when the pump stop time is 7 minutes, 7 × 0.5 = 3 minutes (rounded down after the decimal point) is the stop time. Become). Therefore, the operation time is 15 minutes-3 minutes = 12 minutes.

(2) When the outside air temperature is 0 ° C. to 1.5 ° C., it is multiplied by a factor of 0.8 to obtain a stop time (for example, when the pump stop time is 7 minutes, 7 × 0.8 = 5 minutes (rounded down) Is the stop time). Therefore, the operation time is 15 minutes−5 minutes = 10 minutes.

(3) When the outside air temperature is 1.6 ° C. or higher, the stop time is multiplied by a factor of 1.0 (for example, when the stop time is 7 minutes, the stop time is 7 × 1 = 7 minutes). Therefore, the operation time is 15 minutes-7 minutes = 8 minutes.

  As described in the above (1), (2), and (3), for example, when the outside air temperature is low even when intermittent operation is performed, the operation time of the pump is set to be long. Here, since the outside air temperature is 2 ° C., the intermittent operation pump operation time is 8 minutes, and the stop time is 7 minutes.

During the pump operation, there is a calculation for the next step.
Calculation of step (5) in FIG. 7 The pump operation time T _P during a predetermined time T _F (T _F = 60 minutes) before judging heavy snow / light snow in the formula (1) is (15 minutes after the start of pump start) ) + (15 minutes since step (4) is also a continuous operation) + (pump operation time in the intermittent operation of step (5) 8 minutes), the total pump operation time T _P = 38 minutes. The threshold value used as a criterion is
_{SP = A × (T P /} T F) B = 50 × (38/60) 0.5 = 39PLS
Since the number of snowflake counts for 15 minutes in step (5) is 43, SP value = 39 <43, and the number of snowflake counts in 15 minutes in step (5) is larger than the SP value. Therefore, it is determined that there is heavy snow, and in step (5), the pump is continuously operated.

In the above step (3), the pump operation time T _P to be substituted into the equation (1) is SP value = 25 PLS at T _P = 15 minutes, and in the next step (4), the pump operation time T _P to be substituted into the equation (1). T _P = 15 minutes + 15 minutes = 30 minutes,
SP = 50 × (30/60) ^0.5 = 35 PLS
It becomes.
In the next step (5), the pump operation time T _P to be substituted into the equation (1) is T _P = 15 minutes + 15 minutes + 8 minutes = 38 minutes,
SP = 50 × (38/60) ^0.5 = 39 PLS
The initial SP value when snow begins to fall is low, it is calculated to wet the dry snow surface 40 well to make it difficult to snow, and it becomes easy to operate continuously, and over time, the SP value becomes high and intermittent operation is performed. It has been devised to make it easier.

Step (6), step (7) in FIG. 7 and step (8) in FIG. 8 are sequentially operated as follows.
In step (6), SP = 50 × (53/60) ^0.5 = 46 PLS, number of snowflakes in 15 minutes of step (6) = 26 PLS, 46 PLS> 26 PLS, determination = light snow: intermittent operation. Step (7) Then, SP = 50 × (46/60) ^0.5 = 43 PLS, number of snowflakes in 15 minutes of step (7) = 33 PLS, 43 PLS> 33 PLS, determination = light snow: intermittent operation. In step (8), SP = 50 X (39/60) ^0.5 = 40 PLS, number of snowflakes in 15 minutes of step (8) = 23 PLS, 40 PLS> 23 PLS, judgment = light snow: intermittent operation

  Next, how the pump is stopped will be described with reference to FIG. The snowfall determination interval of the general-purpose snowfall sensor 5 slides one minute at a time, and the interval always counts the number of snowflakes at a set value (here, 5 minutes). Figure 10 shows the number of snowflakes measured for 5 minutes starting from 9 minutes in Step (8), but before and after this slide for 1 minute, counting the snowflakes in the nearest 5 minutes and continuing to count. ing. When the number of snowflakes in the adjacent 5 minutes falls below a certain set value (here, 3), the remaining snow is processed for a certain period of time (here, 4 minutes) and the pump is stopped. The remaining snow processing time can be changed by the user.

  Here, the number of snowflakes counted from 2 to 5 minutes in step (9) is two, which is smaller than the set value PLS = 3. Therefore, at this time, the pump is operated for 4 minutes to perform the remaining snow treatment, and then the pump is stopped. Also, if it starts to snow again, if the number of snowflakes in the proximity of 5 minutes counted by the general-purpose snowfall sensor 5 exceeds the set numerical value, the steps shown in steps (1) and (2) in FIG. The pump starts.

  As described above, the accumulated snowfall time (for example, 15 minutes) for accumulating a certain number of counts of falling snowflakes without using an expensive and high-grade luxury snowfall sensor 1 as shown in FIG. 2 as the snowfall sensor. Further, the snow accumulated on the snowfall surface can be melted with certainty by further improving the control system.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. For example, various set times such as a predetermined time T _F before judging heavy snow / light snow T _F = 60 minutes, pump start / stop time 15 minutes, interval time 15 minutes, etc. are determined. It is not limited to the set time. In addition, any shape or structure that is not directly described in the specification and drawings is within the technical scope of the present invention as long as the effects of the present invention are exhibited.

  An operation control device for a snow melting device according to the present invention is an operation control device for a snow melting device provided with an operation control unit for controlling the operation of a pump based on the number of snowflake counts counted by an optical snowfall sensor. Since it is possible to change the threshold value (SP value) for determining whether the operation is continuous or intermittent depending on the length of the operation time immediately before the pump to determine whether the pump is continuous or intermittent, the snowfall sensor It is an inexpensive and economical snowmelting device that can melt snow on the snowfall surface without using a high-performance high-quality snowfall sensor. It can be used as a snow melting device that effectively melts snow falling in a narrow area such as a parking lot.

DESCRIPTION OF SYMBOLS 1 High-grade snowfall sensor 2 Optical sensor 3 Snowflakes detection area 5 General-purpose snowfall sensor 6 Optical sensor 7 Snowflakes detection area 10 Earth leakage breaker 11 Electromagnetic switch 14 Overcurrent protector 21 Snowfall judgment part 22 Monitor part 23 Alarm part 25 Operation selection part 26 Pump unit 27 Control selection unit 29 Display unit 40 Snowfall surface 41 Sprinkling piping 42 Sprinkling nozzle 50 Deep well 51 Deep well submersible pump 52 Discharge pipe 53 Check valve 54 Open / close valve 55 Drought level sensor 56 Automatic return level sensor 100 Pump control panel 101 Pump operation control circuit unit 102 Control unit 200 Sprinkling unit 300 Water source unit

Claims (5)

An operation control device for a snow melting device comprising a water sprinkling pipe and a pump, sending water pumped from a water source to the water sprinkling piping, sprinkling water on a snowfall surface and melting snow, and counts snowflakes passing through a predetermined horizontal plane area In the operation control device of the snow melting device comprising: an optical snowfall sensor that performs the operation control of the pump based on the snowflake count counted by the optical snowfall sensor;
The operation control unit obtains an SP value, which is a threshold value for determining whether the pump is continuously operating in heavy snow or intermittent operation in light snow, by the following equation, and determines that the snow is heavy if the SP value is equal to or greater than a predetermined value. An operation control device for a snow melting device, characterized in that it is determined that the snow is small if it is less than or equal to the predetermined value.
SP = A × ((T _P / T _F ) ^B )
Here, T _F is the predetermined time before time determines snow-Koyuki from snowflakes count number counted by the optical snowfall sensor, T _P denotes each pump operating time in the time T _F, A is The coefficient can be arbitrarily set, B is a coefficient that can be arbitrarily selected, and A> B. In the operation control device of the snow melting device according to claim 1 ,
The coefficient A in the formula for obtaining the SP value is a value set within A = 1 to 500, and the coefficient B is a value set within B = 0.1 to 0.5. Operation control device of the device. In the operation control device of the snow melting device according to claim 1 ,
In the intermittent operation, the operation control unit sets the basic start / stop time of one time as T _B, and the breakdown of the T _B includes the basic pump operation time as T _PB and the basic pump stop time as T _PS (T _PB + T _PS = T _B ), and the ratio of the basic pump stop time T _{PS to} the basic pump operation time T _PB is reduced when the outside air temperature is low, and is increased when the outside air temperature is high. Operation control device for snow melting equipment. In the operation control device of the snow melting device according to claim 3 ,
One basic start-stop time T _B in the case of the intermittent operation is T _B = 15 min, the basic pump operating time is T _PB = 8 minutes, the basic pump stop time is T _PS = 7 minutes An operation control device for a snow melting device, comprising: In the operation control device of the snow melting device according to claim 3 or 4 ,
Change of the intermittent operation time by the outside air temperature of the operation control unit, the 0.5 T _PS multiplied by a coefficient 0.5 to the basic pump stopping time T _PS in the outside air temperature is lower than 0 ℃ the pump stop time, T _B the -0.5T _PS and the pump operating time, the 0.8 T _PS multiplied by a coefficient 0.8 to the outside air temperature is 0 ° C. to 1.5 ° C. the basic pump stopping time T _PS to the pump stop time, T _B - The pump operating time is 0.8 T _PS , and when the outside air temperature is 1.6 ° C. or higher, the basic pump stop time T _PS is multiplied by a factor of 1, T _PS is the pump stop time, and T _B −T _PS is the pump operation time. An operation control device for a snow melting device.

Images