JPH07259142A - Water distribution block monitor - Google Patents

Abstract

PURPOSE:To adjust without step a water-distribution pressure by comparing primary side pressure with secondary side pressure of a pump, and switching over an output circuit of a generator properly to supply electric energy to the generator. CONSTITUTION:Water stored in a water distribution pond 1 is supplied to a contour water distribution block 4 through a water distribution main pipe 2. Pressure and water distribution block supply pressure in their heads of natural flow-down from a primary pressure gauge 21 and a secondary pressure gauge 22 is inputted to a controller 23. In addition, the controller 23 calculates difference between two pressure, and in the case it is less than pre-determined value set in advance, an operation mode of a pump main body 3 is controlled in a booster mode, and a power driving command is outputted to an AC/DC converter 24. In the case difference between two pressure is in excess of the pre-determined value, the operation mode is controlled in a pressure reduction mode, and a brake driving command is outputted to a controller 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure control for a water supply pipe of a water supply and a monitoring control device for a blocked water distribution block.

[0002]

2. Description of the Related Art In a water supply water distribution system that distributes water from a high-altitude reservoir to a water distribution network in the city by gravity, a pressure reducing valve is used as a means for reducing the head energy due to the difference in altitude. This pressure reducing valve reduces the potential energy of water using a surge tank, and since it cannot be steplessly adjusted, its application was limited to rough pressure adjustment of distribution pressure. Further, the energy of the water pumped up to the distribution reservoir is wasted by the pressure reducing valve by using the power of the water pump or the like.

[0003]

As described above, the use of the pressure reducing valve in the conventional waterworks wastewater system has been limited to the rough adjustment of the distribution pressure, but the pressure is temporarily applied even under natural flow to perform pressure feeding. The need is increasing, and decompression /
It is possible to increase the pressure, and fine pressure control without steps has been required.

Further, in the process of distributing water from the distribution reservoir to the distribution pipe network in the city, the potential energy of water in the distribution reservoir is released by natural flow and wasted by the pressure reducing valve.

Further, in the ground station which monitors the water distribution block, the pressure / flow rate of the water supplied to the water distribution block is monitored, and the pressure / flow rate data of the water is used to properly adjust the demand end pressure in the water distribution block. There has been a growing demand for a control method that keeps the value at a high level, and an advanced monitoring and control function that detects accidents, water leaks, etc. that differ significantly from the appropriate value.

The present invention has been made in view of the above circumstances, and its purpose is to enable stepless distribution pressure adjustment even in a natural flow distribution system, and to recover the potential energy of water stored in a distribution reservoir at the time of decompression. An object of the present invention is to provide a multifunctional water distribution block monitoring device capable of estimating pipeline accidents and water leakage during water distribution block pressure control.

[0007]

In order to achieve the above-mentioned object, a water distribution block monitoring device of the present invention is installed in a water distribution pipe and a pump for converting head water energy of a natural flow system into mechanical energy. A generator that is directly connected to the shaft of the pump and that converts mechanical energy into electric energy; a control device that determines the resistance load and reduced pressure energy that are connected to the generator and that adjusts the generator load amount; A first pressure detecting means for detecting the pressure on the secondary side, a second pressure detecting means for detecting that the secondary side pressure is lower than the primary side pressure from the pressure detection result, and an output circuit of the generator. It is characterized by comprising an energy supply means for supplying electric power outside the switching to the generator.

[0008]

According to the present invention, it is possible to adjust the distribution pressure only by the decompression adjustment, both the decompression / increase adjustment and the stepless pressure adjustment of the distribution pressure, and the head energy of the natural flow system. Can be reused as a control power supply.

[0009]

The present invention will be described below with reference to the drawings. Figure 1
FIG. 1 is a configuration diagram of a first embodiment of the present invention. As shown in the figure, the water stored in the distribution reservoir 1 flows through the distribution main 2.
A contour water distribution block 4 is connected to the water distribution main 2 via a pump body 3. A DC generator 6 is directly connected to the pump body 3 via a coupling 5.
The output terminal of the DC generator 6 is connected to the variable resistor 7, and the resistance value of the variable resistor 7 is controlled by the controller 8. This DC generator 6 acts as a brake for reducing the pressure of the pump body 3. The amount of energy that the DC generator 6 acts as a brake is determined by the resistance value of the variable resistor 7. The control device 8 internally has a distribution flow rate curve 1 in FIG.
1, a distribution pressure curve 12, and a distribution pressure target curve 13 are stored. The energy amount Wt acting as a brake of the DC generator 6 is obtained by the following equation (1).

Wt = 9.8 × Pt × Qt × k (1) where, Wt: amount of braking energy at t, Pt: pressure deviation at t, Qt: flow rate of water distribution at t, k: constant and therefore at t When the pressure deviation Pt and the water flow rate Qt are obtained, Wt is obtained from the above equation (1), and the resistance value of the variable resistor 7 can be obtained from this, and the pump body can be controlled.

Next, the operation of this embodiment will be described in relation to the water distribution block monitoring roadside station and the water supply water distribution system. In FIG. 2, the water stored in the distribution reservoir 1 is supplied to the high-level water distribution block 4 via the water distribution main pipe 2. The water distribution block monitoring roadside station 9 is placed in contact with the inlet of the high-level water distribution block 4 and acts to keep the water distribution pressure constant.

Further, as for the relation between the distribution pressure curve and the distribution pressure target curve, as shown in FIGS. 3 and 4, in the region where the distribution pressure curve 12 exceeds the distribution pressure target curve 13, it acts to reduce the distribution pressure. . Further, in a region where the distribution pressure curve 12 is below the distribution pressure target curve 13, it acts to increase the distribution pressure. Therefore, the pump body can be properly controlled.

FIG. 5 is a block diagram of the second embodiment of the present invention. In the present embodiment, in addition to the configuration of the first embodiment, the AC power receiving board 25 receives commercial power, and the AC / DC converting board 24 converts the alternating current into the direct current to supply the driving power to the DC generator 6. is doing. As a result, the pump body 3 can be driven as a booster pump. In addition, pressure gauges 21 and 22 are set upstream and downstream of the pump main body 3 for detecting the primary pressure and the secondary pressure of the pump, and the detected values are input to the control device 23, and the control command from the control device 23 is input. The control device 8 and the AC / DC conversion board 24 are configured to be input.

Next, the operation of this embodiment will be described.
The control device 23 inputs the measured values of the primary pressure gauge 21 and the secondary pressure gauge 22, and determines the operation mode of the pump body 3.
That is, the pressure which is measured by the primary pressure gauge 21, P ₁ the pressure at the drop of the run-of-river flow, pressure which is measured by secondary pressure gauge 22, water distribution blocks the supply pressure P _2, the pressure of the demand end of the water distribution block Let P be the control device 2
3 calculates P ₁ −P ₂ = ε, and when this ε exceeds (largely) the preset value set in advance, the operation mode of the pump body 3 is controlled to the decompression mode, and ε is the specified value. Pump body 3 when falling below
The operation mode of is controlled to the pressure increasing mode. The control device 23 outputs a power drive command to the AC / DC conversion board 24 when operating as a pressure increasing pump, and outputs a brake drive command to the control device 8 when operating as a pressure reducing pump.

FIG. 6 is a block diagram of the third embodiment of the present invention. In this embodiment, a telemeter device 26 and a flow meter 27 are added to the structure of the second embodiment shown in FIG. Next, the operation of this embodiment will be described. The measurement data of the primary pressure gauge 21, the secondary pressure gauge 22, and the flow meter 27 are input to the telemeter device 26 via the control device 23. Further, the telemeter device 26 transmits data via the public line. The other operations are the same as those in the second embodiment, and will not be described.

FIG. 7 is a block diagram of the fourth embodiment of the present invention. In this embodiment, a storage battery 28 is connected to the output terminal of the DC generator 6 in the configuration of the third embodiment of FIG. 6, and a charger 29 and a control power supply 30 are further connected.

Next, the operation of the present embodiment will be described. The regenerative electric energy of the DC generator 6 is stored in the storage battery 28, and the stored electric energy is monitored by the power-saving block 30 via the control power supply 30. It is reused as the internal power supply of the device. Further, when the storage battery 28 is insufficiently charged, it is charged from the commercial power supply of the AC power receiving panel 25 via the charger 29, so that the storage battery 28 can always supply stable electricity to the control power supply 30. The other operations are the same as those in the third embodiment, and therefore will be omitted.

FIG. 8 is a block diagram of the fifth embodiment of the present invention, in which a computer 31 is connected to the control device 23 having the configuration of the fourth embodiment of FIG. 7 to form a multifunctional water distribution block monitoring station. is there.

Next, the operation of this embodiment will be described. The values of the secondary pressure gauge 22 and the flowmeter 27 are input to the computer 31 and stored therein, and the following processing is performed. That is, as shown in FIG. 9, the nighttime minimum flow rate of the pre-registered water distribution block demand water amount pattern 17 is compared with the value 17a of the flow meter 27, and when the deviation e exceeds a specified value, water leaks into the water distribution block. It is determined that there is an alarm, and an alarm is output to the telemeter device 26 via the control device 23.

Further, as shown in FIG. 10, the above-mentioned flow rate deviation e
In addition, the water distribution block pressure fluctuation pattern 18 registered in advance
And the value 18a of the secondary pressure gauge 22 are compared with each other, and when the deviation α exceeds a specified value and the flow rate deviation e exceeds a specified value, it is determined that an accident has occurred, and an alarm is issued via the control device 23. Output to the telemeter device 26.

FIG. 11 is a block diagram of a sixth embodiment of the present invention, showing an example of a water distribution block monitoring roadside station with a terminal pressure estimating function. In this embodiment, the function generator 32 for inputting the value of the secondary pressure gauge 22 and the value of the flowmeter 27 and outputting the pressure control target value to the controller 23 is added to the second embodiment of FIG. . Since the other structure is the same as that of the second embodiment, its explanation is omitted.

Next, the operation of this embodiment will be described.
The function generator 32 of the present embodiment calculates the terminal pressure in the water distribution block by the calculation using the following equation. P = p + h + kQ ⁿ where P: target value of pressure control p: measured value of secondary pressure gauge 22 h: pressure loss to end Q: measured value of flow meter 31 n: constant In this way, the function generator 32 The calculated pressure control target value is output to the control device 23.

Further, in the water distribution block on-road station of each of the above-described embodiments, the water distribution block can be monitored by controlling the water supply block supply pressure, the water distribution block can be monitored by the demand end pressure control, and the pattern comparison enables the water distribution block inside the water distribution block to be monitored. It is also possible to give an alarm when an accident or water leak occurs.

[0024]

As described above, according to the present invention,
It is possible to adjust the water distribution pressure that was only decompression adjustment, both decompression and pressure increase adjustment, stepless pressure adjustment of water distribution pressure adjustment, and reuse the head energy of the natural flow system as a control power source. You can

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between the water distribution block monitoring roadside station and the water supply water distribution system in FIG.

FIG. 3 is a relational diagram between a distribution pressure curve and a distribution pressure target curve in FIG.

FIG. 4 is a relational diagram of a distribution pressure curve, a distribution pressure target curve, and a pump operation mode in FIG.

FIG. 5 is a configuration diagram of a second embodiment of the present invention.

FIG. 6 is a configuration diagram of a third embodiment of the present invention.

FIG. 7 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 8 is a configuration diagram of a fifth embodiment of the present invention.

FIG. 9 is a diagram for explaining water leakage estimation in FIG. 8.

FIG. 10 is a diagram for explaining the accident accident estimation in FIG.

FIG. 11 is a configuration diagram of a sixth embodiment of the present invention.

[Explanation of symbols]

1 ... Distribution reservoir, 2 ... Distribution mains, 3 ... Pump body, 4 ... High-level water distribution block, 5 ... Coupling, 6 ... DC generator,
7 ... Variable resistor, 8 ... Control device, 9 ... Water distribution block monitoring roadside station 21, 22 ... Pressure gauge, 23 ... Control device, 24 ...
AC / DC converter board, 25 ... AC power receiving board, 26 ... Telemeter device, 27 ... Flowmeter, 28 ... Storage battery, 29 ... Charger,
30 ... Control power supply, 31 ... Computer, 32 ... Function generator.

Claims (1)

[Claims] 1. A pump that is installed in a water distribution pipe and that converts water head energy of a natural flow system into mechanical energy; a generator that is directly connected to the shaft of the pump and that converts mechanical energy into electric energy; Control device for determining the resistance load and pressure reduction energy connected to the machine to adjust the generator load amount, first pressure detection means for detecting the pressures on the primary and secondary sides of the pump, and the primary side based on the pressure detection result. A second pressure detecting means for detecting that the secondary side pressure is lower than the pressure, and an energy supply means for switching the output circuit of the generator to supply external electric energy to the generator. Water distribution block monitoring device.