JP2013231347A - Boost water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boost water supply system in which air is prevented from being sucked from a hydrant between a water supply device for lower floors and a water supply device for upper floors.SOLUTION: A boost water supply system comprises a first water supply device BP1 for lower floors connected to a water pipe 2 and a second water supply device BP2 for upper floors connected in series to the first water supply device BP1 and disposed at a higher position than the first water supply device BP1. The first water supply device BP1 includes a pump P1 and a control panel CN1 which controls operation of the pump P1, and the second water supply device BP2 includes a pump P2 and a control panel CN2 which controls operation of the pump P2. A suction side pressure sensor PS21 which measures a suction side pressure of the second water supply device BP2 is connected to the control panel CN2. When the suction side pressure of the second water supply device BP2 is decreased to a predetermined value, the control panel CN2 stops the operation of the pump P2.

Description

  The present invention relates to a pressurized water supply system for supplying water to a building such as an office building or a condominium.

  Water supply devices are widely used as devices for supplying water (tap water) to buildings such as office buildings and apartment buildings. This water supply apparatus generally includes a centrifugal pump for pumping water, a motor for driving the centrifugal pump, and a control panel for controlling the operation of the motor. The suction port of the centrifugal pump is connected to a water pipe, and water introduced by the water pipe is boosted by the centrifugal pump and then supplied to each water faucet through a water pipe provided in the building. A water supply apparatus directly connected to such a water pipe is generally called a direct connection type water supply apparatus.

  Recently, a pressurized water supply system using a directly connected water supply system is being used for water supply to high-rise buildings. The pressure-increasing water supply system includes a first water supply device for a lower floor and a second water supply device for a higher floor, which are connected in series. The suction port of the first water supply device is directly connected to the water pipe, and water is supplied to the lower floor of the building by the first water supply device. On the other hand, a 2nd water supply apparatus is arrange | positioned at the intermediate | middle floor of a building, the pressure supplied from the 1st water supply apparatus is increased, and it supplies to a high floor.

  In the pressure-increasing water supply system having two water supply devices, since each is operated independently, the following problems may occur. That is, when the second water supply device is operated in a state where the first water supply device is stopped, a negative pressure is formed in the water distribution pipe that connects the first water supply device and the second water supply device. There is. In this state, when the water tap connected to the water pipe is opened, air is sucked from the water tap.

JP 2008-223269 A JP 2008-240276 A JP-A-7-331711

  The present invention has been made in view of the above-described conventional problems, and is a pressure-increasing water supply system that prevents air from being sucked in from a water faucet between a water supply device for a lower floor and a water supply device for a higher floor. The purpose is to provide.

  In order to achieve the above-described object, one aspect of the present invention is a pressure-increasing water supply system for supplying water to a building, the first water supply device for a lower floor connected to a water pipe, and the first water supply. A second water supply device for a higher floor connected in series to the device and disposed at a position higher than the first water supply device, wherein the first water supply device includes the first pump and the first water supply device. A first drive source that drives one pump and a first control unit that controls the operation of the first pump, and the second water supply device includes a second pump and the second pump A suction-side pressure sensor that measures a suction-side pressure of the second water supply device, and has a second drive source that drives the second pump and a second control unit that controls the operation of the second pump. Connected to the second control unit, the first control unit and the second control unit each have a communication function, The first control unit and the second control unit are configured to communicate operation information via the communication function, and when the suction side pressure of the second water supply device is reduced to a predetermined value, The second control unit stops the operation of the second pump.

In a preferred aspect of the present invention, a suction side pressure sensor for measuring a suction side pressure of the first water supply device is connected to the first control unit, and the suction side pressure of the first water supply device is set to a predetermined value. The first control unit stops the operation of the first pump when the pressure drops to a lower level.
In a preferred aspect of the present invention, a discharge-side pressure sensor that measures a discharge-side pressure of the second pump is connected to the first control unit, and a discharge-side pressure sensor that measures the discharge-side pressure of the first pump. Is connected to the second control unit, and the first control unit determines when the discharge side pressure of the first pump reaches the first start pressure and the discharge side pressure of the second pump. The first pump is started when the second starting pressure is reached.
In a preferred aspect of the present invention, the second controller starts the second pump when the discharge side pressure of the second pump reaches a third starting pressure, and the second starting pressure Is set higher than the third starting pressure.

In a preferred aspect of the present invention, the first control unit is configured so that the measurement value of the suction side pressure sensor that measures the suction side pressure of the second water supply device maintains a predetermined target value. The operation of the pump is controlled.
In a preferred aspect of the present invention, in the second water supply apparatus, a backflow preventer is provided on the upstream side of the second pump.
The suction side pressure sensor for measuring the suction side pressure of the second water supply device is provided on the upstream side of the backflow preventer.

In a preferred aspect of the present invention, the suction side pressure sensor for measuring the suction side pressure of the second water supply device is provided with two suction side pressures provided for measuring the suction side pressure of the second water supply device. One of the sensors is a suction side pressure sensor, and the second control unit controls the operation of the second pump when the measured value of the one suction side pressure sensor is reduced to the predetermined value. It is characterized by being stopped.
In a preferred aspect of the present invention, the first control unit is configured so that the measured value of the other suction side pressure sensor of the two suction side pressure sensors maintains a predetermined target value. The operation is controlled.

  According to the present invention, when the suction side pressure of the second water supply device is reduced to a predetermined value, the second control unit stops the operation of the second pump. Even if the discharge pressure of the water supply device is greatly reduced, negative pressure is prevented from being formed in the water distribution pipe connecting the first water supply device and the second water supply device, and air suction on the lower floor is prevented. be able to.

It is a schematic diagram which shows the pressure increase water supply system which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows a 1st water supply apparatus. It is a schematic diagram which shows a 2nd water supply apparatus. It is a schematic diagram which shows the other structural example of the 2nd water supply apparatus. It is a schematic diagram which shows the 1st water supply apparatus provided with the some pump. It is a schematic diagram which shows the pressure increase water supply system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the detailed structure of the pressure increase water supply system shown in FIG. It is a figure which shows the specific example of the pressure increase water supply system shown in FIG. It is a driving | operation characteristic curve figure of a pump. It is a driving | operation characteristic curve figure of the pump for demonstrating an example of estimated terminal pressure fixed control. It is a driving | operation characteristic curve figure of the pump for demonstrating the other example of estimated terminal pressure fixed control.

Hereinafter, an increased pressure water supply system according to an embodiment of the present invention will be described with reference to the drawings.
Drawing 1 is a mimetic diagram showing the pressure increase water supply system concerning a 1st embodiment of the present invention. This pressure increase water supply system is a direct connection type pressure increase water supply system used for a high-rise building (for example, a building having 16 floors or more). As shown in FIG. 1, this pressure-increasing water supply system has a first water supply device BP1 connected to the water pipe 2, and a second water supply device BP2 connected in series to the first water supply device BP1. doing. The first water supply device BP1 is installed on the ground level or underground, and the second water supply device BP2 is installed on the middle floor of the building 1.

  A suction port of the first water supply device BP <b> 1 is connected to the water pipe 2 through the introduction pipe 5. The discharge port of the first water supply device BP1 and the suction port of the second water supply device BP2 are connected to each other by a first water distribution pipe 7. The first water distribution pipe 7 is connected to each water supply on the lower floor of the building 1. The stopper 9 communicates with the branch pipe 12. A second water distribution pipe 15 is connected to the discharge port of the second water supply device BP2, and this second water distribution pipe 15 is connected to each water tap 10 on the higher floor of the building 1 via a branch pipe 13. Communicate. The first water supply device BP1 boosts the water from the water pipe 2 to supply water to each faucet 9 on the lower floor of the building 1, and the second water supply device BP2 is transferred from the first water supply device BP1. The pressure of the generated water is increased to supply water to each of the water taps 10 on the upper floor of the building 1.

  FIG. 2 is a schematic diagram showing the first water supply device BP1. As shown in FIG. 2, the first water supply device BP1 includes a pump P1 connected to the water pipe 2 via the introduction pipe 5, a motor M1 as a drive source for driving the pump P1, and rotation of the motor M1. Inverter INV1 that increases or decreases speed, check valve CV1 disposed on the discharge side of pump P1, flow switch SW1, pressure sensor PS1, and pressure tank PT1 disposed on the discharge side of check valve CV1 are provided. Yes. These components are accommodated in the cabinet CB1.

  The check valve CV1 is provided in a discharge pipe L1 connected to the discharge port of the pump P1, and is a valve for preventing a back flow of water when the pump P1 is stopped. The flow switch SW1 is a flow rate detector that detects that the flow rate of water flowing through the discharge pipe L1 has decreased to a predetermined value. The pressure sensor PS1 is a water pressure measuring device for measuring the discharge side pressure (that is, the back pressure applied to the first water supply device BP1). The pressure tank PT1 is a pressure holder for holding the discharge side pressure while the pump P1 is stopped. The discharge pipe L <b> 1 is connected to the first water distribution pipe 7.

  A decompression backflow preventer 20 is connected to the suction port of the pump P1. The decompression type backflow preventer 20 is obliged to be installed in order to reliably prevent the backflow of water into the water pipe 2. The decompression type backflow preventer is a backflow preventer having a configuration in which two check valves are sandwiched between intermediate chambers in which relief valves are arranged.

  The first water supply device BP1 further includes a control panel (controller) CN1 that controls the water supply operation, and the inverter INV1, the flow switch SW1, and the pressure sensor PS1 are connected to the control panel CN1 via signal lines. . When the flow switch SW1 detects that the flow rate of water has decreased to a predetermined value, the control panel CN1 issues a command to the inverter INV1 to temporarily increase the operating speed of the pump P1, and accumulates pressure in the pressure tank PT1. After that, the operation of the pump P1 is stopped. On the other hand, when the discharge side pressure (water pressure in the discharge pipe L1) decreases to a predetermined value, the control panel CN1 issues a command to the inverter INV1 to start the operation of the pump P1.

  In the first water supply device BP1, the operation speed (rotational speed) of the pump P1 is variable-speed controlled by the inverter INV1 based on the output signals of the flow switch SW1 and the pressure sensor PS1. Generally, the discharge pressure is constant so that the operation speed of the pump P1 is controlled so that the pressure signal measured by the pressure sensor PS1 matches the set target pressure so that the discharge pressure of the pump P1 becomes constant. Control or estimated terminal pressure constant control for controlling the supply water pressure at the terminal water tap to be constant by appropriately changing the target value of the discharge pressure of the pump P1 is performed. According to these controls, the pump P1 is driven at a rotational speed commensurate with the amount of water demand at that time, so energy saving can be achieved.

  FIG. 3 is a schematic diagram showing the second water supply device BP2. The basic configuration and operation of the second water supply device BP2 are the same as those of the above-described first water supply device BP1, and the same reference numerals are given to the same components. This 2nd water supply apparatus BP2 differs from 1st water supply apparatus BP1 by the point which is not equipped with the pressure reduction type | mold backflow preventer. This is because the second water supply device BP2 that is not directly connected to the water pipe 2 is not obliged to be provided with a decompression type backflow preventer.

  The control panel CN1 of the first water supply device BP1 and the control panel CN2 of the second water supply device BP2 each have a communication function. These control panels CN1 and CN2 have an interface (serial port) such as RS-232, and are connected to each other via a communication line 25. The control panels CN1 and CN2 are capable of bidirectional serial communication through the communication line 25. Instead of serial communication, communication using contact signals (electrical ON / OFF signals) may be used. Operation state of pumps P1 and P2 (operation or stop), rotation speed of pumps P1 and P2, measured values of pressure sensors PS1 and PS2 (discharge side pressure), failure information of water supply devices BP1 and BP2, operation for pumps P1 and P2 The operation information including the command is transmitted bidirectionally between the control panel CN1 and the control panel CN2. Such a communication function enables the cooperative operation of the first water supply device BP1 and the second water supply device BP2. In place of the wired system using the communication line 25, a wireless system that does not use the communication line may be adopted.

  When only the pump P2 is started from the state where both the pump P1 of the first water supply device BP1 and the pump P2 of the second water supply device BP2 are stopped, a negative pressure is formed in the first water distribution pipe 7. Sometimes. If the water tap 9 on the lower floor is opened in this state, air may be sucked from the water tap 9. Therefore, in order to prevent such air suction, the pump P1 is always started before the pump P2. That is, when the discharge side pressure of the pump P2 is reduced to a predetermined start pressure, the control panel CN2 issues a command to start the pump P1 to the control panel CN1. The control panel CN1 receives the command to start the pump P1, and sends a signal indicating that the pump P1 has been started to the control panel CN2. The control panel CN2 receives this signal and starts the pump P2.

  While the pump P2 is operating, the operation of the pump P1 is maintained. Furthermore, when stopping the water supply operation from the state where both the pump P1 and the pump P2 are operating, the pump P1 is stopped after the pump P2 is stopped. These cooperative operations are performed based on operation information transmitted between the control panels CN1 and CN2. By such a cooperative operation, the pump P1 is always in operation when the pump P2 is in operation, and a negative pressure is prevented from being formed in the first water distribution pipe 7.

  If only the pump P2 of the second water supply device BP2 is operated when the first water supply device BP1 fails, the above-described problem of air suction may occur. Therefore, when the first water supply device BP1 fails, the control panel CN1 transmits the failure information to the control panel CN2, and the control panel CN2 stops the operation of the pump P2. In this case, even if water is used on the higher floor, the pump P2 is forcibly stopped.

  When the second water supply device BP2 breaks down, water breakage occurs on the higher floors. When there is a margin in the water supply capacity of the first water supply device BP1, it is preferable to raise the water supply pressure of the first water supply device BP1 to the maximum value. That is, when the second water supply device BP2 fails, the control panel CN2 transmits the failure information to the control panel CN1, and the control panel CN1 operates the pump P1 with its maximum water supply capacity. The first water supply device BP1 may not supply water to all the water taps 10 on the higher floors, but the first water supply device BP1 can supply water to at least a part of the higher floors. Water outages throughout the floor can be avoided.

  The pumps P1 and P2 are started when the discharge side pressure drops to a predetermined value. Therefore, starting pressures S1 and S3, which are triggers for starting the pumps P1 and P2, are set in the control panels CN1 and CN2, respectively. Further, a second starting pressure S2 for starting the pump P1 is set in the control panel CN1. The second starting pressure S2 is a second threshold value for starting start based on the measured value of the pressure sensor PS2 of the second water supply device BP2. On the other hand, the first starting pressure S1 is a first threshold value for starting start based on the measured value of the pressure sensor PS1. The second starting pressure S2 is set larger than the starting pressure S3 of the pump P2 (S2> S3). This is because the pump P1 is started before the pump P2 is started as described above.

  The control panel CN1 monitors the measured values of both the pressure sensor PS1 and the pressure sensor PS2, and when the measured value of the pressure sensor PS1 drops to the first starting pressure S1, and the second starting pressure of the pressure sensor PS2. The pump P1 is started based on two triggers when the pressure drops to S2. When the discharge side pressure of the pump P2 decreases, the pressure sensor PS2 detects the starting pressure S2 before the starting pressure S3. The control panel CN1 starts the pump P1 when the measured value of the pressure sensor PS2 sent through the communication line 25 (that is, the discharge side pressure of the pump P2) reaches the starting pressure S2. By such a cooperative operation, the pump P1 is always started before the pump P2.

  When water is used on the lower floors with the pump P1 stopped, the discharge-side pressure of the pump P1 decreases. And when this discharge side pressure falls to starting pressure S1, pump P1 will be started. Thus, the pump P1 is started based on the measured values of the two pressure sensors PS1 and PS2.

  FIG. 4 is a schematic diagram illustrating another configuration example of the second water supply device BP2. As shown in FIG. 4, on the upstream side of the pump P2, a pressure sensor (suction side pressure sensor) 30 for measuring the suction side pressure of the pump P2 is installed. The other structure of 2nd water supply apparatus BP2 is the same as that of the structure shown in FIG. The pressure sensor 30 is connected to the control panel CN2 via a signal line. The measured value of the pressure sensor 30 (that is, the suction side pressure) is sent as operation information to the first water supply device BP1 via the communication line 25.

  The control panel CN1 of the first water supply device BP1 is configured such that the water supply pressure (terminal pressure) of the water tap 9 on the lower floor is a predetermined target value based on the measurement value of the pressure sensor 30 sent from the second water supply device BP2. Feedback control is performed so that Specifically, the control panel CN1 controls the operation of the pump P1 so that the measured value of the pressure sensor 30 maintains a predetermined target value. Since the terminal pressure of the lower floor is substantially equal to the suction side pressure of the second water supply device BP2, the measured value of the pressure sensor 30 is considered to indicate the water supply pressure (terminal pressure) of the water tap 9 of the lower floor. be able to. Therefore, the actual end pressure of the lower floor can be monitored from the measured value of the pressure sensor 30.

  According to such an operation control method, since the operation of the pump P1 is controlled based on the actual terminal pressure, the terminal pressure constant control that is not affected by the pressure drop caused by the frictional resistance in the water distribution pipe is realized. . Therefore, water can be supplied at a desired end pressure. In addition, since the pressure sensor 30 of the second water supply device BP2 can be used as a substitute for the pressure sensor PS1 of the first water supply device BP1, the pressure sensor PS1 can be omitted.

  The first water supply device BP1 and the second water supply device BP2 described above each have only one pump, but may have a plurality of pumps as shown in FIG. FIG. 5 is a schematic diagram illustrating a first water supply device BP1 including a plurality of pumps. Although not shown in figure, 2nd water supply apparatus BP2 can also be equipped with a some pump according to the same arrangement | positioning. By providing multiple pumps, when multiple units are operated with additional disconnection, or when an abnormality is detected in the pump or inverter during operation, the operation is switched to another normal pump or inverter to supply water. Can continue.

Next, the pressure increase water supply system which concerns on the 2nd Embodiment of this invention is demonstrated. In the following description, the same components as those in the first embodiment described above are referred to by the same reference numerals, and descriptions of the same operations as those in the first embodiment are omitted.
Drawing 6 is a mimetic diagram showing the pressure increase water supply system concerning a 2nd embodiment of the present invention. In the first embodiment described above, communication is directly performed between the control panels CN1 and CN2 of the water supply devices BP1 and BP2. In the second embodiment, the communication panel (communication) is connected to the second water supply device BP2. Device) 30 is connected, and communication is performed between the water supply devices BP1 and BP2 via the communication panel 30.

  FIG. 7 is a diagram showing a detailed configuration of the pressure-increasing water supply system shown in FIG. The water supply devices BP1 and BP2 in this embodiment each have a plurality of (two in FIG. 7) pumps, but the water supply devices having one pump as shown in FIGS. It can use for the pressure increase water supply system concerning. The basic configuration of the first water supply device BP1 for the lower floor and the second water supply device BP2 for the higher floor are the same.

  As shown in FIG. 7, in the first water supply device BP1, a pressure reducing backflow preventer 20 is connected upstream of the pump P1, and a suction side pressure sensor is connected upstream of the pressure reducing backflow preventer 20. PS11 (hereinafter simply referred to as pressure sensor PS11) is provided. This pressure sensor PS11 is a sensor that measures the suction side pressure of the first water supply device BP1. The pressure sensor PS11 is connected to the control panel CN1, and the control panel CN1 monitors the suction side pressure of the first water supply device BP1 based on the measured value of the pressure sensor PS11.

  If the pressure of the water pipe 2 decreases for some reason while the first water supply device BP1 is in operation, a negative pressure may be formed in the water pipe 2. Therefore, in order to prevent a negative pressure from being formed in the water pipe 2, when the suction side pressure of the first water supply device BP1, that is, the measured value of the pressure sensor PS11 falls to a predetermined threshold value, the control panel CN1 stops the operation of the pump P1.

  Similarly, a suction side pressure sensor PS21 (hereinafter simply referred to as a pressure sensor PS21) is also provided in the second water supply device BP2. The pressure sensor PS21 is disposed on the upstream side of the decompression type backflow preventer 20, and measures the suction side pressure of the second water supply device BP2. The pressure sensor PS21 is connected to the control panel CN2, and the control panel CN2 monitors the suction side pressure of the second water supply device BP2 based on the measured value of the pressure sensor PS21.

  The reason for providing the pressure sensor PS21 is basically the same as the reason for providing the pressure sensor PS11. That is, when both the water supply devices BP1 and BP2 are operating, if the discharge pressure of the first water supply device BP1 is greatly reduced due to a failure or the like, a negative pressure may be formed in the water distribution pipe 7. . Therefore, when the suction side pressure of the second water supply device BP2, that is, the measured value of the pressure sensor PS21 is reduced to a predetermined threshold value, the control panel CN2 stops the operation of the pump P2.

  Discharge-side pressure sensor PS12 (hereinafter simply referred to as pressure sensor PS12) provided in the first water supply device BP1 and discharge-side pressure sensor PS22 (hereinafter simply referred to as pressure sensor PS22) provided in the second water supply device BP2. ) Corresponds to the pressure sensors PS1 and PS2 in the first embodiment, respectively.

  Since the basic configurations of the first water supply device BP1 and the second water supply device BP2 are the same, the second water supply device BP2 for the higher floor also has a pressure reducing backflow preventer 20. As described above, it is not necessary to provide the pressure reducing backflow preventer in the second water supply device BP2. However, the pressure reducing backflow preventer is also provided in the second water supply device BP2 for the following reason. Is preferred. When the pump P2 of the second water supply device BP2 is stopped, the head pressure in the distribution pipe 15 on the higher floor is received by the check valve CV2 of the second water supply device BP2. However, if this check valve CV2 breaks down, the head pressure corresponding to the height from the upper end of the upper water pipe 15 to the lower end of the lower water pipe 7 acts on the first water supply device BP1. In the case where the first water supply device BP1 does not have sufficient pressure resistance performance to receive the head pressure, the first water supply device BP1 breaks down or is damaged. Therefore, in order to prevent such a secondary failure or breakage, it is preferable to provide the second water supply device BP2 with a decompression type backflow preventer 20 as shown in FIG.

  A suction side pressure sensor PS5 (hereinafter simply referred to as pressure sensor PS5) is further provided on the upstream side of the pump P2, and a discharge side pressure sensor PS6 (hereinafter simply referred to as pressure sensor PS6) is provided on the downstream side of the pump P2. ) Is further provided. The pressure sensor PS5 is disposed on the upstream side of the pressure sensor PS21, and these are located at substantially the same height. Therefore, the measured value of the pressure sensor PS5 and the measured value of the pressure sensor PS21 show substantially the same value. The pressure sensor PS6 is disposed downstream of the pressure sensor PS22 and the pressure tank PT2, and the pressure sensor PS6 and the pressure sensor PS22 are located at substantially the same height. Therefore, the measurement value of the pressure sensor PS6 and the measurement value of the pressure sensor PS22 show substantially the same value.

  The pressure sensor PS5 and the pressure sensor PS6 are connected to the communication board 30, and the measured values of the pressure sensors PS5 and PS6 are transmitted to the communication board 30. This communication board 30 is arrange | positioned adjacent to 2nd water supply apparatus BP2. The communication panel 30 is connected to the control panel CN1 of the first water supply device BP1 and the control panel CN2 of the second water supply device BP2. The communication panel 30 is a communication device that enables operation control in cooperation between the first water supply device BP1 and the second water supply device BP2, and the first water supply device BP1 and the second water supply device BP2 Transmits and receives driving information via the communication panel 30.

  Generally, a control panel of a water supply apparatus is provided with a terminal for inputting / outputting a simple on / off signal to / from the outside of the apparatus. And an operation signal output terminal for outputting whether or not many devices are operating the pump, and an interlock signal input terminal for inputting an interlock signal for forcibly stopping the pump operation from the outside. And. The control panels CN1 and CN2 of the water supply devices BP1 and BP2 of this embodiment are also provided with this input / output terminal, and the communication panel 30 is an input / output terminal of the control panel CN2, specifically, an operation signal output terminal. And the interlock signal input terminal. With such a configuration, the control panel CN2 transmits an operation signal of the pump P2 (a signal indicating an operation state indicating whether the pump P2 is operating or stopped) to the control panel CN1 via the communication panel 30. The Further, an interlock signal can be transmitted from the control panel CN1 to the control panel CN2 via the communication panel 30. Further, the measured values of the pressure sensors PS5 and PS6, that is, the suction side pressure and the discharge side pressure of the pump P2 or the water supply device BP2 are transmitted to the control panel CN1 of the first water supply device BP1 via the communication panel 30. It has become.

  The first water supply device BP1 and the second water supply device BP2 are operated in cooperation with each other via the communication panel 30. More specifically, the pump P1 for the lower floor is started before the pump P2 for the higher floor is started, and the pump P1 is stopped before the pump P2 is stopped. By such cooperative operation, negative pressure is prevented from being formed in the water pipe 7 on the lower floor. Hereinafter, the operation method of the 1st water supply apparatus BP1 and the 2nd water supply apparatus BP2 in this embodiment is demonstrated in detail.

  The pump P1 is always started before the pump P2. In order to establish such a starting order of the pumps P1, P2, the control panel CN1 starts the pump P1 based on the measured values of the three pressure sensors PS12, PS5, PS6. The control panel CN1 stores start pressures S10, S11, and S12 that serve as triggers for starting the pump P1. These starting pressures are threshold values set for the measured values of the pressure sensors PS12, PS5, PS6, respectively. That is, the control panel CN1 includes the discharge side pressure of the pump P1 measured by the pressure sensor PS12, the suction side pressure of the pump P2 measured by the pressure sensor PS5, and the discharge side pressure of the pump P2 measured by the pressure sensor PS6. When either reaches its corresponding starting pressure, the pump P1 is started.

  The control panel CN2 stores a start pressure S13 that serves as a trigger for starting the pump P2. This starting pressure S13 is a threshold set for the measured value of the pressure sensor PS22. That is, the control panel CN2 starts the pump P2 when the discharge side pressure of the pump P2 measured by the pressure sensor PS22 reaches the starting pressure S13. The starting pressure S13 is set smaller than the starting pressure S12 (S12> S13). This is because the pump P1 is started before the pump P2 is started.

  A specific example of the starting condition of the pump P1 will be described with reference to FIG. In the following description, the pressure [Pa] is expressed as a head [m]. As shown in FIG. 8, the height H1 from the first water supply device BP1 to the second water supply device BP2 is 45 m, from the second water supply device BP2 to the highest water tap 10 (water supply end on the higher floor). Height H2 is 55 m. The target discharge pressure of the first water supply device BP1 (target head, target pressure Pb when the estimated terminal pressure constant control of the first water supply device BP1 described later) is set to 70 m, which is larger than the height H1. This is a value set in consideration of the target end pressure of the first water supply device BP1 (the target pressure on the suction side of the second water supply device BP2, which is set to 20 m) and the height H1. ing. The target discharge pressure (target head) of the second water supply device BP2 is set to 70 m, which is larger than the height H2.

  In this example, the three starting pressures of the pump P1, that is, the first starting pressure S10, the second starting pressure S11, and the third starting pressure S12 are set to 70 m, 20 m, and 70 m, respectively. The starting pressure S13 of the pump P2 is set to 68 m that is slightly smaller than the starting pressure S12.

  Next, the starting operation of the pumps P1 and P2 under the above conditions will be described. If water is used on the lower floor when both the pumps P1 and P2 are stopped, the discharge side pressure of the pump P1 and the suction side pressure of the pump P2 are lowered. The control panel CN1 is configured such that when the discharge side pressure of the pump P1 (that is, the measured value of the pressure sensor PS12) is reduced to 70 m (starting pressure S10), or the suction side pressure of the pump P2 (that is, the measured value of the pressure sensor PS5). Is reduced to 20 m (starting pressure S11), the pump P1 is started.

  If both the pumps P1 and P2 are stopped and water is used on a higher floor, the discharge-side pressure of the pump P2 decreases. The discharge side pressure of the pump P2 is measured by pressure sensors PS22 and PS6. The measurement values of these pressure sensors are substantially the same, but as described above, the measurement value of the pressure sensor PS6 is monitored by the control panel CN1 of the first water supply device BP1, and the measurement value of the pressure sensor PS22 is the first measurement value. Monitored by the control panel CN2 of the second water supply device BP2. When the discharge side pressure of the pump P2 drops to 70 m (starting pressure S12), that is, when the measured value of the pressure sensor PS6 drops to 70 m, the control panel CN1 starts the pump P1. Thereafter, when the discharge side pressure of the pump P2 drops to 68 m (starting pressure S13), that is, when the measured value of the pressure sensor PS22 drops to 68 m, the control panel CN2 starts the pump P2.

  Since the starting pressure S12 (70m) of the pump P1 is set higher than the starting pressure S13 (68m) of the pump P2, the discharge side pressure of the pump P2 is earlier than the starting pressure S13 (68m) of the pump P2. The starting pressure S12 (70 m) of the pump P1 is reached. Therefore, even when water is used only on the higher floors, the pump P1 is started before the pump P2. By such a cooperative operation of the first water supply device BP1 and the second water supply device BP2 via the communication panel 30, it is possible to prevent a negative pressure from being formed in the water distribution pipe 7 on the lower floor.

  When water is used on both the lower floor and the higher floor, the pumps P1 and P2 are started in this order according to the above-described starting operation. When the second water supply device BP2 should not be started, such as when the first water supply device BP1 fails, an interlock signal is transmitted from the control panel CN1 to the control panel CN2 via the communication panel 30. In this case, the pump P2 is not started even when the above-described start condition is satisfied.

  Next, the stop operation of the pumps P1 and P2 will be described. In the case where water is used on both the lower floor and the upper floor, when the use of water on the higher floor is stopped, the discharge flow rate of the pump P2 decreases. When the flow switch SW2 detects that the discharge flow rate has decreased to a predetermined value (set value for stopping a small amount of water), it sends a detection signal to the control panel CN2. The control panel CN2 receives this detection signal, issues a command to the inverter INV2, temporarily increases the rotational speed of the pump P2, and accumulates the pressure in the pressure tank PT2 to a pressure higher than the starting pressure S12 (70 m), and then pump P2. Stop.

  In the case where water is used on both the lower floor and the upper floor, when the use of water on the lower floor is stopped, the discharge flow rate of the pump P1 decreases. In this case, even if the discharge flow rate of the pump P1 drops to the set value for stopping the small amount of water, the control panel CN1 does not stop the operation of the pump P1. This is because the operation of the pump P2 is continued. The operation signal of the pump P2 is transmitted from the control panel CN2 to the control panel CN1 via the communication panel 30, and the control panel CN1 does not stop the pump P1 when the pump P2 is operating. By such a cooperative operation of the first water supply device BP1 and the second water supply device BP2 via the communication panel 30, it is possible to prevent a negative pressure from being formed in the water distribution pipe 7 on the lower floor.

  When the use of water on the higher floor is stopped after the use of water on the lower floor is stopped, the control panel CN2 stops the pump P2 according to the above-described operation. Thereafter, when the discharge flow rate of the pump P1 decreases and reaches a predetermined value (set value for stopping a small amount of water), the flow switch SW1 transmits the detection signal to the control panel CN1. The control panel CN1 stops the pump P1 on condition that the pump P2 is stopped. Immediately before the pump P1 is stopped, the control panel CN1 issues a command to the inverter INV1 to temporarily increase the rotational speed of the pump P1, and the discharge side pressure of the pump P1 exceeds a predetermined stop pressure higher than the start pressure S10. The pressure is increased until the suction side pressure of the pump P2 reaches a predetermined stop pressure higher than the starting pressure S11, and the pressure is accumulated in the pressure tank PT1.

  As described above, also in the present embodiment, the pump P1 and the pump P2 are started in this order by communication via the communication panel 30, and the pump P2 and the pump P1 are stopped in this order. Therefore, when the pump P2 is operating, the pump P1 is always operating, and the formation of negative pressure in the water distribution pipe 7 on the lower floor can be prevented. In addition, when three or more stages of water supply devices are connected in series, similarly, the pump is started from the lowest level and the pump is stopped from the highest level.

  As described above, the start and stop of the pumps P1 and P2 have been described in detail, but the two pressure sensors PS21 and PS5 in the second embodiment are arranged on the suction side of the pump P2 in the first embodiment. If the two pressure sensors PS22 and PS6 in the second embodiment are applied to the pressure sensor PS2 arranged on the discharge side of the pump P2 in the first embodiment (see FIG. 4), The starting and stopping operations in the pressure increasing water supply system are the same in the first embodiment.

  During the operation of the pump P1, the control panel CN1 of the first water supply device BP1 is based on the measured value of the pressure sensor PS5 sent from the communication panel 30, and the water supply pressure of the low-level water tap 9 (the terminal at the low-level floor). Feedback control is performed so that the pressure is a predetermined target value. Specifically, the control panel CN1 controls the operation of the pump P1 so that the measured value of the pressure sensor PS5 maintains a predetermined target value. When the pressure sensor PS5 fails, the control panel CN1 performs the estimated terminal pressure constant control based on the measured value of the pressure sensor PS12. The failure of the pressure sensor PS5 can be detected by the control panel CN1 under the condition that its output value does not change at all during a predetermined time.

  Here, the estimated terminal pressure constant control will be described with reference to the operation characteristic curve diagram of FIG. In FIG. 9, the horizontal axis represents the amount of water, that is, the flow rate, the vertical axis represents the head, that is, the head (hereinafter also referred to as “pressure” as appropriate), and the curve Nx represents the operating characteristics when the rotational speed of the pump P1 is constant. The resistance curve R is a pipe line resistance according to the amount of water used from the pump P1 to the feed end (feed tap 9). In the estimated terminal pressure constant control, the rotational speed of the pump P1 is controlled in consideration of the pipe resistance (indicated by the resistance curve R) corresponding to the amount of water used. That is, the rotational speed of the pump P1 is controlled based on the measured value of the pressure sensor PS12 so that the discharge pressure of the pump P1 changes along the resistance curve R. Therefore, when the amount of water is small, the pipe resistance is small, and accordingly, the required power of the pump P1 is reduced, and energy saving operation is realized.

  In the example of FIG. 9, the rotational speed of the pump P1 is Na (the rotational speed for achieving the target estimated terminal pressure (20 m in the example of FIG. 8) at the maximum water amount) and Nb (the target estimated above when the water amount is 0). The rotational speed to achieve end pressure). For example, at the flow rate Q1, the pump P1 is operated at the rotational speed Nc. In FIG. 9, Pa is the discharge-side pressure of the pump P1 required to achieve the target estimated terminal pressure at the maximum water amount, and Pb is the discharge of the pump P1 required to achieve the target estimated terminal pressure when the water amount is zero. Side pressure.

  When the estimated terminal pressure constant control is performed based on the measurement value of the pressure sensor PS12, the reliability of the suction side pressure of the second water supply device BP2 is low compared to the terminal pressure constant control using the pressure sensor PS5. The pressure may be lower than the estimated pressure. Further, in the estimated terminal pressure constant control, since the water amount Q is normally estimated from the rotation speed of the pump P1, the followability to a sudden change in the amount of water used tends to be worse than in the terminal pressure constant control. Therefore, the suction side pressure of the second water supply device BP2 is significantly reduced especially when the amount of water used on the higher floors suddenly increases when the amount of water used on the lower floors is small. Negative pressure may be formed. This can be handled as follows.

  The required pressure Pa on the discharge side of the pump P1 at the maximum water amount set in consideration of the pipe resistance between the first water supply device BP1 and the second water supply device BP2, and the pipe resistance is subtracted from Pa. With respect to Pb (required pressure on the discharge side of the pump P1 when the amount of water is 0), the value of Pa is left as it is, and the pressure Pb ′ is higher than the pressure Pb ′ In this case, a new curve R ′ is set in place of the pipe resistance R, as shown in FIG. Thereby, even if the first water supply device BP1 is operated where the amount of water is close to a small amount of water, the discharge pressure of the first water supply device BP1 can be afforded, so that it is possible to cope with a rapid increase in water use on a higher floor. Furthermore, as shown in FIG. 11, Pb may be set to a higher pressure Pb ″ so that Pa = Pb ″. In this case, it is not the estimated terminal pressure constant control but the discharge pressure constant control. That is, in the water supply device BP1 on the lower floor, by performing the discharge pressure constant control, it is possible to prevent the suction side pressure of the water supply device BP2 from decreasing due to a sudden increase in water usage.

  The embodiment described above is described for the purpose of enabling the person having ordinary knowledge in the technical field to which the present invention belongs to implement the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention should not be limited to the described embodiments, but should be the widest scope according to the technical idea defined by the claims.

DESCRIPTION OF SYMBOLS 1 Building 2 Water supply pipe 5 Introductory pipe 7 1st water distribution pipe 9,10 Water supply tap 12,13 Branch pipe 15 2nd water distribution pipe 20 Decompression-type backflow preventer 25 Communication line 30 Communication board BP1, BP2 Water supply apparatus M1, M2 Motor INV1, INV2 Inverter CV1, CV2 Check valve SW1, SW2 Flow switch PS1, PS2, 30, PS11, PS12, PS21, PS22, PS5, PS6 Pressure sensor PT1, PT2 Pressure tank CN1, CN2 Control panel CB1, CB2 Cabinet L1 , L2 discharge pipe

Claims (9)

A pressurized water supply system for supplying water to a building,
A first water supply device for a lower floor connected to a water pipe;
A second water supply device for a high floor connected to the first water supply device in series and disposed at a position higher than the first water supply device;
The first water supply device includes a first pump, a first drive source that drives the first pump, and a first control unit that controls the operation of the first pump,
The second water supply device has a second pump, a second drive source that drives the second pump, and a second control unit that controls the operation of the second pump,
A suction side pressure sensor for measuring a suction side pressure of the second water supply device is connected to the second control unit;
The first control unit and the second control unit each have a communication function,
The first control unit and the second control unit are configured to communicate driving information via the communication function,
The pressure-increasing water supply system, wherein when the suction side pressure of the second water supply device is reduced to a predetermined value, the second control unit stops the operation of the second pump. A suction side pressure sensor for measuring a suction side pressure of the first water supply device is connected to the first control unit;
2. The increase according to claim 1, wherein when the suction-side pressure of the first water supply device is reduced to a predetermined value, the first control unit stops the operation of the first pump. Pressure water supply system. A discharge-side pressure sensor for measuring a discharge-side pressure of the first pump is connected to the first control unit;
A discharge-side pressure sensor for measuring a discharge-side pressure of the second pump is connected to the second control unit;
The first control unit is configured such that when the discharge side pressure of the first pump reaches a first start pressure and when the discharge side pressure of the second pump reaches a second start pressure, The pressure-increasing water supply system according to claim 1 or 2, wherein the first pump is started. The second control unit starts the second pump when the discharge side pressure of the second pump reaches a third starting pressure,
The increased pressure water supply system according to claim 3, wherein the second starting pressure is set higher than the third starting pressure.   The first control unit controls the operation of the first pump so that a measured value of the suction side pressure sensor that measures a suction side pressure of the second water supply device maintains a predetermined target value. The pressure-increasing water supply system according to any one of claims 1 to 4.   In the said 2nd water supply apparatus, the backflow preventer is provided in the upstream of the said 2nd pump, The pressure increase water supply system as described in any one of the Claims 1 thru | or 5 characterized by the above-mentioned.   The pressure-increasing water supply system according to claim 6, wherein the suction side pressure sensor that measures the suction side pressure of the second water supply device is provided on the upstream side of the backflow preventer. The suction-side pressure sensor that measures the suction-side pressure of the second water supply device is one of the two suction-side pressure sensors provided to measure the suction-side pressure of the second water supply device Side pressure sensor,
The said 2nd control part stops the driving | operation of a said 2nd pump, when the measured value of said one suction side pressure sensor falls to the said predetermined value, The operation | movement of a said 2nd pump is stopped. The pressure increase water supply system as described in any one of Claims.   The first control unit controls the operation of the first pump so that the measured value of the other suction side pressure sensor of the two suction side pressure sensors maintains a predetermined target value. The increased pressure water supply system according to claim 8, wherein

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