JP2015010405A - Booster 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 provided 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 and a second water supply device BP2 for upper floors. The second water supply device BP2 includes a flow rate detector SW2 for detecting a flow rate of the discharge side of a second pump P2. The flow rate detector SW2 transmits a flow rate increase signal to a first control part CN1 of the first water supply device BP1 when the flow rate increases and reaches a predetermined value. When the first control part CN1 receives the flow rate increase signal during operation of a first pump P1 of the first water supply device BP1, the operation of the first pump P1 is continued forcibly.

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, there is a problem that air is sucked from the water tap.

  In patent document 1, in order to prevent the fall of the pressure in the water pipe which connects a 1st water supply apparatus and a 2nd water supply apparatus, the pressure increase water supply which provided the pressure tank on the suction side of the 2nd water supply apparatus A system is disclosed. With this pressure tank, the discharge-side pressure of the first water supply device is maintained even when the second water supply device is driven using water on a higher floor in a state where the first water supply device is stopped. Therefore, it is prevented that a negative pressure is formed in the water pipe between the first water supply device and the second water supply device for a while. However, if water is continuously used on the higher floors, the pressure in the pressure tank gradually decreases. As a result, there is a possibility that a negative pressure is formed in the water distribution pipe between the first water supply device and the second water supply device.

JP 2008-223269 A

  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.

  One aspect of the present invention is a pressure-increasing water supply system for supplying water to a building, which is connected in series to a first water supply device for a lower floor connected to a water pipe, the first water supply device, And a second water supply device for a higher floor arranged at a position higher than the first water supply device, wherein the first water supply device is a first pump and a first pump that drives the first pump. A second controller for controlling the operation of the first pump; and the second water supply device includes a second pump and a second drive for driving the second pump. A second control unit that controls the operation of the second pump, and a flow rate detector that detects a flow rate on the discharge side of the second pump. It is configured to transmit a flow rate increase signal to the first control unit when the predetermined value is increased, and the first control unit When the first control unit receives the flow rate increase signal during the operation of the pump, the first control unit forcibly continues the operation of the first pump. It is a water supply system.

  Another aspect of the present invention is a pressurized water supply system for supplying water to a building, which is connected in series to a first water supply device for a lower floor connected to a water pipe, and the first water supply device, A second water supply device for a higher floor disposed at a higher position than the first water supply device, wherein the first water supply device is a first pump and a first pump that drives the first 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 a second pump that drives the second pump. A drive unit; a second control unit that controls the operation of the second pump; and a discharge-side pressure sensor that measures a discharge-side pressure of the second pump. It is configured to transmit the measured value of the discharge side pressure to the first controller, and during the operation of the first pump When the measured value of the discharge side pressure drops to a predetermined starting pressure, the first control unit is a pressure-increasing water supply system that forcibly continues the operation of the first pump. .

  Another aspect of the present invention is a pressurized water supply system for supplying water to a building, which is connected in series to a first water supply device for a lower floor connected to a water pipe, and the first water supply device, A second water supply device for a higher floor disposed at a higher position than the first water supply device, wherein the first water supply device is a first pump and a first pump that drives the first 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 a second pump that drives the second pump. A drive unit, a second control unit for controlling the operation of the second pump, a flow rate detector for detecting a flow rate on the discharge side of the second pump, and measuring a discharge side pressure of the second pump A discharge side pressure sensor, and the flow rate detector detects a flow rate increase signal when the flow rate increases and reaches a predetermined value. The discharge-side pressure sensor is configured to transmit to the first control unit, and the discharge-side pressure sensor is configured to transmit a measured value of the discharge-side pressure to the first control unit. When the first control unit receives the flow rate increase signal during the operation of the pump, or when the measured value of the discharge side pressure decreases to a predetermined starting pressure during the operation of the first pump. The first control unit is a pressure increasing water supply system that forcibly continues the operation of the first pump.

In a preferred aspect of the present invention, the discharge-side pressure sensor is connected to the second control unit, and when the measured value of the discharge-side pressure of the second pump is reduced to the predetermined starting pressure, The second controller starts the second pump.
In a preferred aspect of the present invention, the second water supply device further includes a discharge-side pressure sensor that measures a discharge-side pressure of the second pump in addition to the discharge-side pressure sensor. One discharge side pressure sensor of the side pressure sensors is connected to the first control unit, and the measured value of the discharge side pressure of the one discharge side pressure sensor is transmitted to the first control unit. The discharge-side pressure sensor is connected to the second control unit, and when the measured value of the discharge-side pressure of the other discharge-side pressure sensor decreases to the predetermined starting pressure, the second control unit The second pump is started.

In a preferred aspect of the present invention, the communication apparatus further includes a communication device that transmits the flow rate increase signal to the first control unit.
In a preferred aspect of the present invention, the apparatus further includes a communication device that transmits the measured value of the discharge side pressure to the first control unit.
In a preferred aspect of the present invention, the apparatus further includes a communication device that transmits the flow rate increase signal and the measured value of the discharge side pressure to the first control unit.

In a preferred aspect of the present invention, the flow rate increase signal is configured to be transmitted from the second control unit to the first control unit via a communication line.
In a preferred aspect of the present invention, the measurement value of the discharge side pressure is transmitted from the second control unit to the first control unit via a communication line.
A preferable aspect of the present invention is configured to transmit the flow rate increase signal and the measured value of the discharge side pressure from the second control unit to the first control unit via a communication line. It is characterized by.

  According to the present invention, the operation of the first pump is continued while the second pump is operating. Therefore, the operation of only the second pump, that is, the operation of the second water supply device alone is prevented, and the suction of air from the water faucet between the lower floor and the upper floor can be prevented.

It is a schematic diagram which shows the pressure increase water supply system which concerns on one 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 other 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 pressure increase water supply system which abbreviate | omitted the communication apparatus. It is a figure which shows the specific example of the pressure increase water supply system shown in FIG. It is a figure which shows the pressure increase water supply system which abbreviate | omitted some pressure sensors. 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 one 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 increases the pressure 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 through the introduction pipe 5, a motor M1 as a driving device for driving the pump P1, and rotation of the motor M1. An inverter INV1 that increases or decreases speed, a check valve CV1 disposed on the discharge side of the pump P1, a flow rate detector SW1, a pressure sensor PS1, and a pressure tank PT1 disposed on the discharge side of the check valve CV1 are provided. ing. These components are accommodated in the cabinet CB1.

  The check valve CV1 is provided in the discharge pipe L1 connected to the discharge port of the pump P1, and prevents reverse flow of water when the pump P1 is stopped. The flow rate detector SW1 is a flow rate detector that detects the flow rate of the water flowing through the discharge pipe L1, and outputs a flow rate lowering signal when the flow rate of the water decreases and reaches a predetermined value. A flow rate increase signal is output when the predetermined value is reached. As the flow rate detector SW1, a flow rate sensor, a flow switch, or the like can be used. The pressure sensor PS1 is a water pressure measuring instrument for measuring the discharge side pressure of the pump P1 (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 (first control unit) CN1 that controls the water supply operation. The inverter INV1, the flow rate detector SW1, and the pressure sensor PS1 are connected to the control panel CN1 via signal lines. Connected. When the flow rate detector SW1 detects that the water flow rate 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. Then, the operation of the pump P1 is stopped. Such a stop operation is called a small water amount stop operation. On the other hand, when the discharge side pressure of the pump P1 (water pressure in the discharge pipe L1) drops 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 controlled by the control panel CN1 based on the output signals of the flow rate detector 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. However, the second water supply device BP2 may be provided with a decompression type backflow preventer.

  The first water supply device BP1 may include a bypass pipe (not shown) that allows the introduction pipe 5 and the first water distribution pipe 7 to communicate with each other. A check valve (not shown) is attached to the bypass pipe. When the suction side pressure of the pump P1 is higher than a predetermined pressure, the water in the introduction pipe 5 is supplied to each water tap 9 on the lower floor through the bypass pipe (that is, bypassing the pump P1). Similarly, the second water supply device BP2 may include a bypass pipe and a check valve. When the suction side pressure of the pump P2 is higher than a predetermined pressure, the water in the first water distribution pipe 7 is supplied to each water tap 10 on the higher floor through the bypass pipe.

  The control panel (first control unit) CN1 of the first water supply device BP1 and the control panel (second control unit) 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.

  The rotational speeds of the pumps P1, P2 and the failure information of the water supply devices BP1, BP2 are 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.

  The pressure sensor PS2 and the flow rate detector SW2 of the second water supply device BP2 are connected to the control panel CN2, and are also connected to the control panel CN1 of the first water supply device BP1 via the signal lines 26 and 27. Yes. Therefore, the output value of the pressure sensor PS2 (that is, the measured value of the discharge side pressure of the pump P2) and the output signal of the flow rate detector SW2 (that is, the flow rate decrease signal and the flow rate increase signal described above) are transmitted to the control panel CN2. In addition, the signal is transmitted to the control panel CN1 of the first water supply device BP1 through the signal lines 26 and 27. The signal lines 26 and 27 may be omitted, and the output value of the pressure sensor PS2 and the output signal of the flow rate detector SW2 may be transmitted from the control panel CN2 to the control panel CN1 via the communication line 25.

  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 output value of the pressure sensor PS2 (measured value of the discharge side pressure of the pump P2). The first starting pressure S1 is a first threshold value for starting issuing based on the output value of the pressure sensor PS1 (measured value of the discharge side pressure of the pump P1). The second starting pressure S2 of the pump P1 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.

  The control panel CN1 monitors the output values of both the pressure sensor PS1 and the pressure sensor PS2, and when the output value of the pressure sensor PS1 drops to the first starting pressure S1 and / or the output value of the pressure sensor PS2 The pump P1 is started based on two triggers when the pressure is reduced to the second starting pressure S2. When the discharge side pressure of the pump P2 decreases, the pressure sensor PS2 detects the starting pressure S2 of the pump P1 before the starting pressure S3 of the pump P2. The control panel CN1 starts the pump P1 when the output value of the pressure sensor PS2 sent through the signal line 26 (that is, the measured value of the discharge side pressure of the pump P2) reaches the starting pressure S2. With such a configuration, 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. In this way, the pump P1 is started based on the output values of the two pressure sensors PS1, PS2. When the flow rate on the discharge side of the pump P1 decreases to a predetermined value, the flow rate detector SW1 transmits a flow rate decrease signal to the control panel CN1. The control panel CN1 receives this flow rate reduction signal and stops the operation of the pump P1.

  When water is used on the higher floors and the discharge side pressure of the pump P2 drops to the starting pressure S3, the pump P2 is started. In this case, if the pump P1 stops during the operation of the pump P2, a negative pressure is formed in the first water distribution pipe 7 connecting the pump P1 and the pump P2, and air is sucked from the water tap 9 . Therefore, in order to prevent such air suction, when the pump P2 is started while the pump P1 is in operation, even if the control panel CN1 receives a flow rate reduction signal from the flow rate detector SW1, The control panel CN1 is configured not to stop the operation of the pump P1, that is, to forcibly continue the operation of the pump P1.

  When water is used on a higher floor, the discharge side pressure of the pump P2 decreases and the flow rate of water in the discharge pipe L2 increases. When the flow rate of water in the discharge pipe L2 increases and reaches a predetermined value, the flow rate detector SW2 transmits a flow rate increase signal to the control panel CN1 via the signal line 27. That is, almost simultaneously with when the pump P2 is started, the flow rate detector SW2 transmits a flow rate increase signal to the control panel CN1. Therefore, this flow rate increase signal can be said to be a start signal indicating the start of the pump P2.

  When the control panel CN1 receives the flow rate increase signal from the flow rate detector SW2, the control panel CN1 does not stop the operation of the pump P1 even if the flow rate decrease signal is received from the flow rate detector SW1, that is, the pump The operation of P1 is forcibly continued.

  As described above, the pump P2 is started when the discharge side pressure of the pump P2 drops to the starting pressure S3. Therefore, as another embodiment, the control panel CN1 may determine whether or not the pump P2 has started based on the discharge-side pressure of the pump P2 acquired by the pressure sensor PS2. Specifically, when the output value of the pressure sensor PS2 (measured value of the discharge-side pressure of the pump P2) is reduced to the starting pressure S3 of the pump P2, the control panel CN1 receives a flow rate decrease signal from the flow rate detector SW1. Is received, the operation of the pump P1 is not stopped, that is, the operation of the pump P1 is forcibly continued.

  As yet another embodiment, the control panel CN1 may determine whether or not the pump P2 has been started based on both the output value of the pressure sensor PS2 and the flow rate increase signal from the flow rate detector SW2. Specifically, when the control panel CN1 receives a flow rate increase signal from the flow rate detector SW2, or when the output value of the pressure sensor PS2 has decreased to the starting pressure S3 of the pump P2, the control panel CN1 has a flow rate. Even when the flow rate reduction signal is received from the detector SW1, the operation of the pump P1 is not stopped, that is, the operation of the pump P1 is forcibly continued.

  As described above, the control panel CN1 forcibly continues the pump P1 based on the output value of the pressure sensor PS2 and / or the flow rate increase signal from the flow rate detector SW2. Therefore, the operation of the pump P1 is continued while the pump P2 is operating. Such a configuration prevents a negative pressure from being formed in the first water distribution pipe 7.

  FIG. 4 is a schematic diagram illustrating another configuration example of the second water supply device BP2. As shown in FIG. 4, a suction side pressure sensor 40 (hereinafter simply referred to as a pressure sensor 40) for measuring the suction side pressure of the pump P2 is installed on the upstream side of the pump P2. The other structure of 2nd water supply apparatus BP2 is the same as that of the structure shown in FIG. The pressure sensor 40 is connected to the control panel CN2. Further, the pressure sensor 40 is connected to the control panel CN1 through the signal line 28, and the output value of the pressure sensor 40 (that is, the measured value of the suction side pressure of the pump P2) is sent to the control panel CN1 through the signal line 28. . The output value of the pressure sensor 40 may also be sent from the control panel CN2 to the control panel CN1 via the communication line 25 without the signal line 28.

  Based on the output value of the pressure sensor 40 sent from the second water supply device BP2, the control panel CN1 of the first water supply device BP1 sets the water supply pressure (terminal pressure) of the water tap 9 on the lower floor to a predetermined target value. Feedback control is performed so that Specifically, the control panel CN1 controls the operation of the pump P1 so that the output value of the pressure sensor 40 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, it is considered that the output value of the pressure sensor 40 indicates 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 output value of the pressure sensor 40.

  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 7 is realized. Is done. Therefore, water can be supplied at a desired end pressure. In addition, since the pressure sensor 40 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 may 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, a pressure increase water supply system according to still another embodiment of the present invention will be described. In the following description, the same components as those in the above-described embodiment are referred to by the same reference numerals, and redundant description thereof is omitted.

  FIG. 6 is a schematic diagram showing a pressure-increasing water supply system according to another embodiment of the present invention. In the embodiment shown in FIG. 1 described above, direct communication is performed between the control panels CN1 and CN2 of the water supply devices BP1 and BP2. In the embodiment shown in FIG. 6, the communication device is connected to the second water supply device BP2. 30 is connected, and communication is performed between the water supply apparatuses BP1 and BP2 via the communication apparatus 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 for measuring the suction side pressure of the pump P1. The pressure sensor PS11 is connected to the control panel CN1, and the control panel CN1 monitors the suction side pressure of the pump P1 based on the output 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 pump P1, that is, the output value of the pressure sensor PS11 is reduced to a predetermined threshold value, the control panel CN1 has the pump P1. The operation is stopped.

  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 pump P2. The pressure sensor PS21 is connected to the control panel CN2, and the control panel CN2 monitors the suction side pressure of the second pump P2 based on the output 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 pump P2, that is, the output value of the pressure sensor PS21 falls to a predetermined threshold value, the control panel CN2 stops the operation of the pump P2.

  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 20 in the second water supply device BP2, but the pressure reducing backflow preventer 20 is also provided in the second water supply device BP2 for the following reason. It is preferable to provide it. 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 PS22 (hereinafter simply referred to as pressure sensor PS22) is provided on the downstream side of the pump P2. ) And discharge side pressure sensor PS6 (hereinafter simply referred to as pressure sensor PS6). 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 output value of the pressure sensor PS5 and the output value of the pressure sensor PS21 are substantially the same. 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 output value of the pressure sensor PS6 and the output value of the pressure sensor PS22 are substantially the same.

  The discharge-side pressure sensor PS12 (hereinafter simply referred to as the pressure sensor PS12) provided in the first water supply device BP1 corresponds to the pressure sensor PS1 in the above-described embodiment. The pressure sensor PS22 and the pressure sensor PS6 provided in the second water supply device BP2 correspond to the pressure sensor PS2 in the above-described embodiment. The pressure sensor PS22 is connected to the control panel CN2, and the control panel CN2 monitors the discharge side pressure of the pump P2 based on the output value of the pressure sensor PS22.

  The communication device 30 is disposed adjacent to the second water supply device BP2. The communication device 30 is connected to the control panel CN1 of the first water supply device BP1 via the communication line 25. The pressure sensors PS5 and PS6 and the flow rate detector SW2 are connected to the communication device 30. The output values of the pressure sensors PS5 and PS6, that is, the measured values of the suction side pressure and the discharge side pressure of the pump P2, are transmitted to the control panel CN1 of the first water supply device BP1 via the communication device 30. . A flow rate increase signal output from the flow rate detector SW2 is also transmitted to the control panel CN1 via the communication device 30.

  The flow rate detector SW2 is also connected to the control panel CN2, and the flow rate increase signal and the flow rate decrease signal output from the flow rate detector SW2 are also transmitted to the control panel CN2. The pressure sensor PS22 is connected to the control panel CN2, but is not connected to the communication device 30. On the other hand, the pressure sensor PS6 is connected to the communication device 30, but is not connected to the control panel CN2. Therefore, the output value of the pressure sensor PS22 is used for starting the pump P2, and the output value of the pressure sensor PS6 is used for starting the pump P1.

  The first water supply device BP1 may include a bypass pipe (not shown) that allows the introduction pipe 5 and the first water distribution pipe 7 to communicate with each other. A check valve is attached to the bypass pipe. When the suction side pressure of the pump P1 is higher than a predetermined pressure, the water in the introduction pipe 5 is supplied to each water tap 9 on the lower floor through the bypass pipe. Similarly, the second water supply device BP2 may include a bypass pipe and a check valve. When the suction side pressure of the pump P2 is higher than a predetermined pressure, the water in the first water distribution pipe 7 is supplied to each water tap 10 on the higher floor through the bypass pipe.

  As shown in FIG. 8, the communication device 30 may be omitted. In this case, the pressure sensors PS5 and PS6 and the flow rate detector SW2 are directly connected to the control panel CN1 via a signal line.

  Hereinafter, the operation methods of the first water supply device BP1 and the second water supply device BP2 shown in FIGS. 7 and 8 will be described 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 output 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 output 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. The starting pressure S13 is a threshold set for the output 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. The pressure sensor PS22 functions as a starting pressure sensor for detecting the starting pressure of the pump P2.

  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. 9, 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 and set to 20 m) and the height H1. It has become. 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 starting pressures S10, S11, and 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 output value of the pressure sensor PS12) drops to 70 m (starting pressure S10), or the suction side pressure of the pump P2 (that is, the output 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. Since these pressure sensors PS22 and PS6 are arranged at the same height, their output values are substantially the same, but as described above, the output value of the pressure sensor PS6 is the control of the first water supply device BP1. It is monitored by the panel CN1, and the output value of the pressure sensor PS22 is monitored by the control panel CN2 of the second water supply device BP2. When the discharge side pressure of the pump P2 decreases to 70 m (starting pressure S12), that is, when the output value of the pressure sensor PS6 decreases 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 output 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. With such a configuration, a negative pressure is prevented 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 use of water is started on the higher floors when the pump P1 is operating, the discharge side pressure of the pump P2 decreases. In the embodiment shown in FIG. 8, the discharge side pressure of the pump P2 is measured by the pressure sensor PS22 and the pressure sensor PS6. The measurement value acquired by the pressure sensor PS6 is sent to the control panel CN1. When the discharge side pressure of the pump P2 drops to the starting pressure S13 (68m) of the pump P2, even if water is not used on the lower floor (that is, a flow rate reduction signal is transmitted from the flow rate detector SW1 to the control panel CN1. Even if), the control panel CN1 forcibly continues the operation of the pump P1. With such a configuration, while the pump P2 is operating, the operation of the pump P1 is not stopped, and a negative pressure is prevented from being formed in the water distribution pipe 7 on the lower floor.

  Instead of the output value of the pressure sensor PS6, the control panel CN1 may determine the continuation of the operation of the pump P1 using a flow rate increase signal sent from the flow rate detector SW2. That is, when the use of water is started on a higher floor while the pump P1 is operating, the water starts to flow on the discharge side of the pump P2. When the flow rate of the water on the discharge side increases and reaches a predetermined value, the flow rate detector SW2 transmits a flow rate increase signal to the control panel CN1. The control panel CN1 receives this flow rate increase signal and forcibly continues the operation of the pump P1.

  Further, the control panel CN1 may determine whether or not the pump P1 continues to operate using both the output value of the pressure sensor PS6 and the flow rate increase signal from the flow rate detector SW2. That is, the output value of the pressure sensor PS6 (measured value of the discharge side pressure of the pump P2) has decreased to the starting pressure S13 of the pump P2, or the control panel CN1 has received a flow rate increase signal sent from the flow rate detector SW2. At that time, the control panel CN1 forcibly continues the operation of the pump P1. In this way, by using both the output value of the pressure sensor PS6 and the flow rate increase signal from the flow rate detector SW2, it is possible to reliably detect the start of operation of the high-rise pump P2. For example, even if for some reason a failure or delay occurs in the operation start detection of the pump P2 based on either the output value of the pressure sensor PS6 or the flow rate increase signal of the flow rate detector SW2, the pump P2 is detected based on the other. The start of operation can be detected. Therefore, it is possible to reliably prevent a negative pressure from being formed in the water distribution pipe 7 on the lower floor.

  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 higher floor, when the use of water on the higher floor is stopped, the flow rate on the discharge side of the pump P2 decreases. When the flow rate detector SW2 detects that the flow rate has decreased to a predetermined value (set value for stopping a small amount of water), it sends a flow rate decrease 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. (Small water stop operation)

  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 flow rate on the discharge side of the pump P1 decreases. In this case, even if the flow rate on the discharge side of the pump P1 falls to the set value for the operation for stopping the small amount of water, the control panel CN1 continues the operation without stopping the operation of the pump P1. This is because the operation of the pump P2 is continued.

  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 in accordance with the above-described small water amount stop operation. Thereafter, when the flow rate on the discharge side of the pump P1 decreases and reaches a predetermined value (set value for the operation for stopping a small amount of water), the flow rate detector SW1 transmits a flow rate decrease signal to the control panel CN1, and the pump P1 Stop. 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 a signal for stopping the pump P1 when the use of water on the higher floor is stopped after the use of water on the lower floor is stopped, the flow rate detector SW2 uses the above-described flow rate reduction signal as a control panel. You may transmit to CN1. The control panel CN1 determines by itself that the pump P2 is stopped by receiving this flow rate reduction signal, and starts a small water amount stop operation. In the case of such a configuration, it becomes possible to quickly perform the operation of stopping the small amount of water of the pump P1, and the useless operation of the pump P1 is omitted, so that energy saving can be achieved.

  Thus, the pump P1 is started in the order of the pump P2, and the operation of the pump P1 is continued while the pump P2 is operating. 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 on the lower floor is operated while the pump on the higher floor is operating. Will continue.

  As described above, the start, continuous operation, and stop of the pumps P1 and P2 have been described in detail. The two pressure sensors PS21 and PS5 shown in FIG. 8 are replaced with the pressure sensor 40 shown in FIG. If the sensors PS22 and PS6 are applied to the pressure sensor PS2 shown in FIG. 4, the start and stop operations in the pressure increasing water supply system in the embodiment shown in FIG. 8 are the same in the embodiment shown in FIG.

  As shown in FIG. 10, the pressure sensor PS21 and the pressure sensor PS6 may be omitted. In this case, the pressure sensor PS5 and the pressure sensor PS22 are connected to both the control panel CN2 and the communication device 30, respectively. Although not shown, the pressure sensor PS21 and the pressure sensor PS6 may be omitted even in a configuration where the communication device 30 is not provided (see FIG. 8). In this case, the pressure sensor PS5 and the pressure sensor PS22 are connected to both the control panel CN2 and the control panel CN1, respectively.

  As shown in FIG. 10, when the pressure sensor PS6 is omitted, the starting pressures S12 and S13 are thresholds set for the output value of the pressure sensor PS22. That is, when the output value of the pressure sensor PS22 reaches the first starting pressure S12 (70 m), the control panel CN1 starts the pump P1. When the output value of the pressure sensor PS22 reaches the second starting pressure S13 (68m), the control panel CN2 starts the pump P2.

  During the operation of the pump P1, the control panel CN1 of the first water supply device BP1 determines that the water supply pressure (the end pressure at the lower floor) of the water tap 9 on the lower floor is a predetermined target value based on the measured value of the pressure sensor PS5. Feedback control is performed as follows. 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. 11, the horizontal axis represents the amount of water, that is, the flow rate, the vertical axis represents the head, that is, the head, 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. 11, 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. 9) 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. 11, Pa is the discharge-side pressure of the pump P1 required to achieve the target estimated end pressure at the maximum water amount, and Pb is the discharge of the pump P1 required to achieve the target estimated end pressure when the water amount is 0 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 lower than that of 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 ′ And a new curve R ′ is set instead 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. 13, 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 pipe 5 Introductory pipe 7 1st water distribution pipes 9, 10 Water supply taps 12, 13 Branch pipe 15 2nd water distribution pipe 20 Decompression type backflow preventer 25 Communication line 26, 27, 28 Signal line 30 Communication apparatus BP1 , BP2 Water supply device M1, M2 Motor INV1, INV2 Inverter CV1, CV2 Check valve SW1, SW2 Flow rate detector PS1, PS2, 40, PS11, PS12, PS21, PS22, PS5, PS6 Pressure sensor PT1, PT2 Pressure tank CN1, CN2 Control panel CB1, CB2 Cabinet L1, L2 Discharge pipe

Claims (11)

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 unit that drives the first pump, and a first control unit that controls the operation of the first pump,
The second water supply device includes a second pump, a second drive unit that drives the second pump, a second control unit that controls operation of the second pump, and the second pump unit. A flow rate detector for detecting the flow rate on the discharge side of the pump,
The flow rate detector is configured to transmit a flow rate increase signal to the first control unit when the flow rate increases and reaches a predetermined value.
When the first control unit receives the flow rate increase signal during the operation of the first pump, the first control unit forcibly continues the operation of the first pump. Increased pressure water supply system. 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 unit that drives the first pump, and a first control unit that controls the operation of the first pump,
The second water supply device includes a second pump, a second drive unit that drives the second pump, a second control unit that controls operation of the second pump, and the second pump unit. A discharge side pressure sensor for measuring the discharge side pressure of the pump,
The discharge side pressure sensor is configured to transmit a measured value of the discharge side pressure to the first control unit,
When the measured value of the discharge side pressure drops to a predetermined starting pressure during the operation of the first pump, the first control unit forcibly continues the operation of the first pump. Increased pressure water supply system. 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 unit that drives the first pump, and a first control unit that controls the operation of the first pump,
The second water supply device includes a second pump, a second drive unit that drives the second pump, a second control unit that controls operation of the second pump, and the second pump unit. A flow rate detector for detecting the flow rate on the discharge side of the pump, and a discharge side pressure sensor for measuring the discharge side pressure of the second pump,
The flow rate detector is configured to transmit a flow rate increase signal to the first control unit when the flow rate increases and reaches a predetermined value.
The discharge side pressure sensor is configured to transmit a measured value of the discharge side pressure to the first control unit,
When the first control unit receives the flow rate increase signal during the operation of the first pump, or during the operation of the first pump, the measured value of the discharge side pressure is reduced to a predetermined starting pressure. When it does, the said 1st control part forcibly continues the driving | operation of a said 1st pump, The pressure increase water supply system characterized by the above-mentioned. The discharge side pressure sensor is connected to the second control unit,
4. The second control unit starts the second pump when the measured value of the discharge side pressure of the second pump is reduced to the predetermined start pressure. The increased pressure water supply system described in 1. The second water supply device further includes a discharge-side pressure sensor that measures a discharge-side pressure of the second pump in addition to the discharge-side pressure sensor,
One discharge side pressure sensor of the two discharge side pressure sensors is connected to the first control unit, and the measured value of the discharge side pressure of the one discharge side pressure sensor is transmitted to the first control unit. The other discharge-side pressure sensor is connected to the second control unit, and when the measured value of the discharge-side pressure of the other discharge-side pressure sensor decreases to the predetermined starting pressure, the second discharge-side pressure sensor The pressure-increasing water supply system according to claim 2 or 3, wherein the control unit starts the second pump.   The pressure-increasing water supply system according to claim 1, further comprising a communication device that transmits the flow rate increase signal to the first control unit.   The pressure-increasing water supply system according to claim 2, further comprising a communication device that transmits a measured value of the discharge side pressure to the first control unit.   The pressure-increasing water supply system according to claim 3, further comprising a communication device that transmits the flow rate increase signal and the measured value of the discharge side pressure to the first control unit.   The pressure increase water supply system according to claim 1, wherein the flow rate increase signal is configured to be transmitted from the second control unit to the first control unit via a communication line.   The pressure increase according to claim 2, wherein the measured value of the discharge side pressure is transmitted from the second control unit to the first control unit via a communication line. Water supply system.   4. The flow rate increase signal and the measured value of the discharge side pressure are configured to be transmitted from the second control unit to the first control unit via a communication line. The increased pressure water supply system described in 1.

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