JPH0259247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water sprinkler used for snow melting, etc., and more specifically, a variable flow rate system that reduces the amount of heat consumed by water by improving the water distribution and reduces the power consumption of the water sprinkler. It relates to a sprinkler control device.

A large amount of water is used to melt snow on tracks and road surfaces, and conventionally such watering has been typically performed by applying a constant water pressure to a large number of water nozzles or sprinklers. That is, it has been common practice to determine the pump capacity and piping to be sufficient to achieve the required water spraying distance, and to supply water to each water nozzle or sprinkler at a constant water pressure.
In the case of such a water sprinkling method using a constant water pressure, there is generally variation in the water spray distribution between near the nozzle and far away, although it depends on the type of nozzle, and this tendency is particularly strong when there is wind. Furthermore, since the pump capacity is set at a maximum and constant value so as to obtain the required distance, the power consumption is extremely large. Furthermore, since water was constantly sprinkled over a fixed area, the water droplets were very small.
Therefore, the heat loss during flight was also large.

The present invention aims to solve this problem.
Provided is a variable flow rate watering control device that supplies water to a watering nozzle or a sprinkler by changing the water supply pressure over time.

To specifically explain the structure and operation of the present invention according to the embodiments shown in the drawings, FIG. and a self-controlled valve 4 that transmits setting signals of different magnitudes in a predetermined cycle.
A variable flow rate watering control device is shown, which includes a water pressure set value transmitter 5 that transmits a water pressure setting value transmitter 5 to There is. In the figure, nozzles 2 consisting of water spray nozzles or sprinklers are attached to the ends of a large number of branch pipes branching from a discharge side main pipe 7 of a pump 1, and the large number of nozzles 2 receive water from one pump 1. As schematically shown in FIG. 2, the self-control valve 4 installed in the pipe line 3 of each branch pipe receives a water pressure signal (a) on the valve discharge side and a setting signal (a) from the water pressure set value transmitter 5. b) The opening degree is automatically adjusted so as to be in balance. The water pressure setting value transmitter 5 periodically emits pressure signals having different magnitudes in several stages or continuously, and the magnitude and period of the signal can be arbitrarily determined. The self-control valve 4 receives setting signals (b) that periodically vary in magnitude from this water pressure setting value transmitter 5, and if there is a deviation from the water pressure signal (a) on the valve discharge side, it opens until the deviation disappears. As a result, the water supply pressure to the nozzle 2 is changed in accordance with the cycle emitted from the water pressure set value transmitter 5. On the other hand, the pump capacity control panel 6
controls the water supply capacity of the pump 1 according to the magnitude of the signal transmitted from the water pressure set value transmitter 5. More specifically, the pump 1 is activated by the signal from the water pressure set value transmitter 5.
Controls the rotation speed of the drive motor. Such rotation speed control can be performed by using a known inverter unit. As a result, water is supplied to each nozzle 2 with the water supply pressure changing periodically, and the reach distance of the water sprayed from each nozzle 2 changes periodically, and the required driving power of the pump 1 also changes from the maximum set power to the minimum power. This results in a significant reduction in power consumption compared to the conventional system, which fluctuates between Additionally, with this device, it is possible to instantly supply a large amount of water to one point.
Large water droplets can also be made to fly.

FIG. 3 shows an automatic control valve 10 installed in a pipe 3 leading from the pump 1 to the water nozzle 2, a water pressure sensor 11 for detecting the water pressure on the discharge side of the automatic control valve 10, and a predetermined A water pressure setting value transmitter 5 that emits a setting signal that changes in cycles, and the water pressure sensor 1
a pressure controller 12 that detects a deviation between the detected value of 1 and the signal value transmitted by the water pressure set value transmitter 5 and provides an opening/closing signal to the automatic control valve 10 when there is a deviation; 1 shows a variable flow water sprinkling control device of the present invention, which is comprised of a pump capacity control panel 6 for controlling the power of the pump 1 according to the capacity of the pump 1.

Also in this example, the nozzle 2 consisting of a water nozzle or a sprinkler is the main pipe 7 on the discharge side of the pump 1.
Each automatic control valve 10 is attached to the end of a large number of branch pipes branching from the pump 1, and a large number of nozzles 2 receive water supply from one pump 1.
A water pressure sensor 11 is attached to the discharge side of the water pressure sensor 11, and a detection signal of this water pressure sensor 11 is sent to a pressure controller 12.
I will be sent to The pressure controller 12 periodically receives setting signals of different magnitudes from the water pressure setting value transmitter 5, compares them with the signal from the water pressure sensor 11, and if there is a deviation, controls the automatic control valve. Send a signal. The water pressure setting value transmitter 5 used here also periodically emits pressure signals of different sizes in several stages, as in the case of Fig. 1, and the magnitude and period of the signal at each stage are arbitrarily determined. It's starting to become easier. FIG. 4 shows an example of the control flow of this automatic control valve 4, and the setting signal in the figure means a signal that is issued from the water pressure setting value transmitter 5 and periodically varies in magnitude. The pump capacity control panel 6 controls the rotation speed of the pump drive motor using, for example, an inverter unit, as in the example shown in FIG. 1, but in the example shown in FIG. The opening signal of the automatic control valve installed in the branch pipe is received, and the rotational speed of the pump drive motor is controlled based on this signal. FIG. 5 shows an example of the flow of pump capacity control based on the state of the valve 4. Here, the over-open signal of the valve is a signal that is emitted when the opening degree is larger than the required opening degree. Through such control operations, water is supplied to each nozzle 2 with the water supply pressure changing periodically, as in the example shown in FIG. The required driving power of the first method also fluctuates between the maximum set power and the minimum set power, so that the power consumption can be significantly reduced compared to the conventional method.

FIG. 6 shows an example of a cycle in which the water supply pressure changes over time when water is sprinkled on the track 15 from the nozzles 2 on both sides according to the control device of the present invention to melt snow on the track. This is a case where the water supply pressure is changed in stages. In stage A, the water supply pressure is maximum and the water spray distance is the longest, and in stage C, the water supply pressure is the minimum and the water spray distance is the shortest. Stage B is in between. Both stages were watered for 1 minute every 3 minutes;
During that time, virtually no watering is performed in the watering zones of other stages. In addition, at each stage, the nozzle 2 may be one in which the oscillation or diameter changes intermittently so that the direction of water spraying or the water spray distribution changes over time.

According to the device of the present invention, the flying distance of water changes in stages as described above, and compared to the conventional method of spraying water over a wide zone using constant water pressure, water is sprayed in narrow specific zones. Therefore, the diameter of the water droplet during flight becomes larger than in the conventional case. Therefore, the degree of temperature drop due to heat removal by the atmosphere during flight is suppressed compared to the conventional case, and the snow melting effect can be enhanced. In addition, variations in the distribution of watering are reduced, and as a result, the intensity of watering (total amount of watering) can be reduced.

As described above, the device of the present invention provides a variable flow rate watering control device that can reduce the watering power and improve the watering distribution by variable flow rate and water pressure. This can greatly contribute to power and water savings for sprinkler equipment that requires

[Brief explanation of drawings]

Fig. 1 is an equipment layout system diagram showing an embodiment of the device of the present invention, Fig. 2 is an operation diagram for explaining the control operation of the self-control valve used in the device of Fig. 1, and Fig. 3 is a diagram of the device according to the present invention. FIG. 4 is a control flow diagram of the control valve, FIG. 5 is a control flow diagram of pump capacity, and FIG. 6 is a water sprinkling cycle state diagram showing another example of the device. 1... Pump, 2... Nozzle, 3... Branch pipe line,
4... Self-control valve, 5... Water pressure set value transmitter, 6... Pump capacity control panel, 10... Automatic control valve, 11... Water pressure sensor, 12... Water pressure controller.

Claims (1)

[Scope of Claims] 1. A self-control valve 4 which is interposed in a pipe 3 leading from the pump 1 to the water nozzle 2 and which adjusts its opening degree by itself according to a signal value, and a self-control valve 4 which transmits setting signals of different sizes in a predetermined cycle. A variable flow water sprinkling system comprising a water pressure set value transmitter 5 that sends a signal to the self-powered control valve 4, and a pump capacity control panel 6 for controlling the power of the pump 1 to a capacity that corresponds to the opening degree of the self-powered control valve 4. Control device. 2. An automatic control valve 10 installed in the pipe line 3 leading from the pump 1 to the water nozzle 2, and this automatic control valve 10.
Water pressure sensor 1 for detecting water pressure on the discharge side of
1, a water pressure set value transmitter 5 that emits a set signal that fluctuates in a predetermined cycle, and detects the deviation between the detected value of the water pressure sensor 11 and the transmitted signal value of the water pressure set value transmitter 5, and if there is a deviation, The above automatic control valve 1
A variable flow water sprinkling control device comprising a pressure controller 12 that provides a zero opening/closing signal, and a pump capacity control panel 6 that controls the power of the pump 1 to a capacity that corresponds to the opening degree of the automatic control valve 4.