JP2011137305A - Boost water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boost water supply system capable of detecting a drop in the charged pressure of a pressure tank connected to a distributing pipe that connects a water supply apparatus for low stories to a water supply apparatus for high stories. <P>SOLUTION: The boost water supply system includes a first water supply apparatus BP1 for low stories connected to a main water pipe; a second water supply apparatus BP2 for high stories connected in series to the first water supply apparatus BP1 and disposed in a position higher than the first water supply apparatus BP1; and the pressure tank 30 connected to the distributing pipe that connects the first water supply apparatus BP1 to the second water supply apparatus BP2. The first water supply apparatus BP1 and the second water supply apparatus BP2 have pumps respectively, and the second water supply apparatus BP2 issues an alarm indicating that the charged pressure of the pressure tank 30 is not in a normal range when the suction side pressure of the second water supply apparatus BP2 drops to a predetermined pressure drop detection value when starting the pump of the second water supply apparatus BP2. <P>COPYRIGHT: (C)2011,JPO&INPIT

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 unit for controlling the operation of the motor. The suction port of the centrifugal pump is connected to the water main, and the water introduced by the water main is boosted by the centrifugal pump and then supplied to each water faucet through a water distribution pipe provided inside the building. Such a water supply apparatus directly connected to the water main 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 inlet of the first water supply apparatus is directly connected to the water main, and water is supplied to the lower floors of the building by the first water supply apparatus. 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.

  Therefore, as shown in Patent Document 1, a pressure tank is provided between the first water supply device and the second water supply device to reduce the pressure in the water distribution pipe between the first water supply device and the second water supply device. In the past, it has been practiced to prevent this. The pressure tank generally has a diaphragm inside, and a pressure chamber partitioned by the diaphragm is filled with a compressible gas such as air. The water flowing into the pressure tank compresses the gas in the pressure chamber through the diaphragm, and the pressure of the water in the water distribution pipe is maintained by the pressure of the compressed gas.

  By providing such a pressure tank, even if the second water supply device is operated while the first water supply device is stopped, the pressure in the water distribution pipe is maintained and the suction of air from the water tap is prevented. Is done. However, since the gas filled in the pressure tank gradually escapes as time passes, it is necessary to periodically replenish the pressure chamber with the gas to maintain the pressure in the pressure tank.

JP 2008-223269 A

  This invention is made in view of the situation mentioned above, and it can detect the fall of the enclosure pressure of the pressure tank connected to the water pipe which connects the water supply apparatus for low floors, and the water supply apparatus for high floors. An object is to provide an increased pressure water supply system.

In order to achieve the above-described object, one aspect of the present invention is a pressurized water supply system for supplying water to a building, the first water supply device for a lower floor connected to a water main, and the first water supply device A second water supply device for a high floor connected to a water supply device in series and arranged at a position higher than the first water supply device, and the first water supply device and the second water supply device are connected. A pressure tank connected to the water distribution pipe, each of the first water supply device and the second water supply device having a pump, and the second water supply device is a pump of the second water supply device. When the suction side pressure of the second water supply device is reduced to a predetermined pressure drop detection value at the time of starting, an alarm is generated indicating that the sealed pressure of the pressure tank is not within a normal range.
In a preferred aspect of the present invention, the second water supply device counts the number of times that the suction side pressure of the second water supply device has decreased to the pressure drop detection value when the pump of the second water supply device is started. When the number of times reaches a preset number, the warning is issued.

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 main, and to the first water supply device, A high-floor second water supply device disposed at a higher position than the first water supply device, and a pressure tank connected to a water pipe connecting the first water supply device and the second water supply device The first water supply device and the second water supply device each have a pump, and the second water supply device is configured to start the pump of the second water supply device. When the suction side pressure increases to a predetermined pressure increase detection value, an alarm is generated indicating that the sealed pressure in the pressure tank is not within a normal range.
In a preferred aspect of the present invention, the second water supply device counts the number of times that the suction side pressure of the second water supply device has increased to the pressure increase detection value when the pump of the second water supply device is started. When the number of times reaches a preset number, the warning is issued.

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 main, and to the first water supply device, A high-floor second water supply device disposed at a higher position than the first water supply device, and a pressure tank connected to a water pipe connecting the first water supply device and the second water supply device The first water supply device and the second water supply device each have a pump, and the second water supply device is configured to start the pump of the second water supply device. When the pressure difference between the lowest pressure at which the suction side pressure of the second pressure decreases and the highest pressure at which the suction side pressure of the second water supply device rises most is calculated, and the pressure difference reaches a predetermined pressure difference detection value , Issue an alarm indicating that the pressure in the pressure tank is not within the normal range And wherein the door.
In a preferred aspect of the present invention, the second water supply device counts the number of times that the pressure difference reaches the pressure difference detection value when the pump of the second water supply device is started, and the number of times is set in advance. When reaching the above, the alarm is issued.

  When the sealed pressure in the pressure tank is greatly reduced, the suction side pressure of the second water supply device varies greatly with the start of the pump of the second water supply device. According to the present invention, it is possible to detect a decrease in the pressure in the pressure tank based on the suction side pressure of the second water supply device without directly measuring the pressure in the pressure tank.

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. The change of the discharge side pressure of the 1st water supply apparatus, the suction side pressure and discharge side pressure of the 2nd water supply apparatus, and the discharge flow rate of the 2nd water supply apparatus when the enclosure pressure of a pressure tank is in a normal range is shown. It is a graph. Changes in the discharge-side pressure of the first water supply device, the suction-side pressure and discharge-side pressure of the second water supply device, and the discharge flow rate of the second water supply device when the sealed pressure in the pressure tank is outside the normal range It is a graph.

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 includes a first water supply device BP1 connected to the main water pipe 2 and a second water supply device BP2 connected in series to the first water supply device BP1. Have. 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.

  The suction port of the first water supply device BP1 is connected to the water main pipe 2 via 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 main 2 and supplies the water to each faucet 9 on the lower floor of the building 1. The second water supply device BP2 is supplied from the first water supply device BP1. The pressure of the transferred water is increased and water is supplied to each water tap 10 on the upper floor of the building 1.

  A pressure tank 30 is provided between the first water supply device BP1 and the second water supply device BP2. More specifically, the pressure tank 30 is disposed on the suction side of the second water supply device BP and is connected to the first water distribution pipe 7. The pressure tank 30 is a pressure holding device for holding the pressure in the first water distribution pipe 7. A diaphragm is provided inside the pressure tank 30 and a pressure chamber partitioned by the diaphragm is filled with a compressible gas such as air. The water flowing into the pressure tank 30 from the first water distribution pipe 7 compresses the gas in the pressure chamber via the diaphragm, and the pressure in the first water distribution pipe 7 is maintained by the pressure of the compressed gas.

  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 main pipe 2 through the introduction pipe 5, a motor M1 as a drive source for driving the pump P1, and the motor M1. Inverter INV1 that increases or decreases the rotational speed, pressure sensor PS11 disposed on the suction side of pump P1, check valve CV1 disposed on the discharge side of pump P1, and flow disposed on the discharge side of check valve CV1 A switch SW1, a pressure sensor PS12, and a pressure tank PT1 are provided. These components are accommodated in the cabinet CB1. In this embodiment, two sets of pumps P1, motor M1, inverter INV1, check valve CV1, and flow switch SW1 are arranged in parallel, but one set or three or more sets of pumps, motors, inverters, A check valve and a flow switch may be provided.

  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 PS11 is a water pressure measuring device for measuring the suction side pressure of the first water supply device BP1. The pressure sensor PS12 is a water pressure measuring device for measuring the discharge side pressure of 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.

  A decompression backflow preventer 20 is connected to the suction port of the pump P1. This decompression type backflow preventer 20 is obliged to be installed in order to reliably prevent the backflow of water to the water main 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 unit (controller) CN1 that controls the water supply operation, and the inverter INV1, the flow switch SW1, and the pressure sensors PS11 and PS12 are connected to the control unit CN1 via signal lines. ing. When the flow switch SW1 detects that the flow rate of water has decreased to a predetermined value, the control unit CN1 issues a command to the inverter INV1 to temporarily increase the operation speed of the pump P1, and sets the discharge side pressure to a predetermined value. The operation of the pump P1 is stopped after increasing the pressure to the stop pressure. On the other hand, when the discharge side pressure decreases to a predetermined starting pressure, the control unit CN1 issues a command to the inverter INV1 to start the operation of the pump P1. This starting pressure is a threshold value that serves as a trigger for starting the pump P1.

  In the first water supply device BP1, the pump P1 is driven at a variable speed by the inverter INV1 based on output signals from the flow switch SW1 and the pressure sensor PS12. In general, the discharge pressure is controlled such that the operation speed of the pump P1 is controlled so that the pressure signal measured by the pressure sensor PS12 matches the set target pressure so that the discharge side pressure of the pump P1 becomes constant. Constant control, 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 side pressure of the pump P1, and the like are 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. The second water supply device BP2 is different from the first water supply device BP1 in that it does not include a backflow preventer. This is because the second water supply device BP2 that is not directly connected to the water main 2 is not obliged to be provided with a backflow preventer. However, in consideration of the case where the check valve CV2 of the second water supply device BP2 fails, the second water supply device BP2 may also be provided with a backflow preventer.

  The pressure tank 30 described above is provided on the suction side of the second water supply device BP2, and is located at substantially the same height as the second water supply device BP2. Even when the pump P2 of the second water supply device BP2 is operated when the first water supply device BP1 is stopped due to a failure or the like, water is supplied from the pressure tank 30 for a while, The pressure in the water distribution pipe 7 is maintained. Since the gas filled in the pressure chamber of the pressure tank 30 gradually escapes as time elapses, the gas is periodically replenished to the pressure chamber and the sealed pressure of the pressure tank 30 (that is, the gas in the pressure tank 30) Filling amount) must be maintained. If the sealed pressure in the pressure tank 30 is greatly reduced, the amount of water that can be held in the pressure tank 30 while keeping the pressure high is greatly reduced, and the pressure in the water distribution pipe 7 just flows out of a small amount of water. Will drop significantly. Therefore, the suction side pressure of the second water supply device BP2 varies greatly with the start of the pump P2. Therefore, the control unit CN2 of the second water supply device BP2 detects a decrease in the sealed pressure of the pressure tank 30 based on the suction side pressure of the second water supply device BP2.

  FIG. 4 shows the discharge side pressure of the first water supply device BP1, the suction side pressure and the discharge side pressure of the second water supply device BP2, and the second water supply device when the sealed pressure of the pressure tank 30 is within the normal range. It is a graph which shows the change of the discharge flow volume of BP2. In the graph of FIG. 4, the vertical axis represents the head (m), that is, the pressure, and the discharge flow rate (L / min) of the second water supply device BP2. Further, the horizontal axis of the graph of FIG. 4 represents time.

  When the water tap 10 is opened on the higher floor of the building 1, the discharge side pressure of the second water supply device BP2 gradually decreases. When the discharge side pressure drops to a predetermined starting pressure, the control unit CN2 issues a command to the inverter INV2 to start the pump P2. There is a slight time lag between the time when the output value of the pressure sensor PS22 (that is, the discharge side pressure of the second water supply device BP2) reaches a predetermined starting pressure and the time when the pump P2 is actually started. Therefore, as shown in FIG. 4, the pump P2 is started after the discharge-side pressure of the second water supply device BP2 is lower than the starting pressure of the pump P2. After the start of the pump P2, the control unit CN2 performs feedback control based on the deviation between the output value of the pressure sensor PS22 and a predetermined target pressure.

  If the sealed pressure in the pressure tank 30 is normal, the discharge-side pressure of the first water supply device BP1 gradually decreases as the pump P2 is operated as shown in the graph of FIG. This is because water is discharged from the pressure tank 30 little by little by the sealed pressure of the pressure tank 30. And when the discharge side pressure of 1st water supply apparatus BP1 falls even to the predetermined starting pressure, control part CN1 issues a command to inverter INV1 and starts pump P1. The suction side pressure of the second water supply device BP2 and the discharge side pressure of the first water supply device BP1 differ only by the head difference between the first water supply device BP1 and the second water supply device BP2, but the same as each other. Change.

  On the other hand, FIG. 5 shows the discharge side pressure of the first water supply device BP1, the suction side pressure and the discharge side pressure of the second water supply device BP2, and the second pressure when the sealed pressure of the pressure tank 30 is outside the normal range. It is a graph which shows the change of the discharge flow rate of water supply apparatus BP2. In this case, when the pump P2 is started, the suction side pressure of the second water supply device BP2 and the discharge side pressure of the first water supply device BP1 rapidly decrease. This is because the pressure tank 30 cannot maintain the pressure in the first water distribution pipe 7 as a result of a decrease in the sealed pressure of the pressure tank 30. For this reason, as shown in the graph, immediately after the pump P2 is started, the suction side pressure of the second water supply device BP2 and the discharge side pressure of the first water supply device BP1 rapidly decrease. When the output value of the pressure sensor PS12 of the first water supply device BP1 decreases to a predetermined starting pressure, the control unit CN1 issues a command to the inverter INV1 to start the pump P1. Since there is a slight time lag between the time when the output value of the pressure sensor PS12 reaches a predetermined starting pressure and the time when the pump P1 is actually started, as shown in FIG. 5, the first water supply device BP1. The discharge side pressure further decreases below the starting pressure of the pump P1.

  When the pump P1 is started, the suction side pressure of the second water supply device BP2 and the discharge side pressure of the first water supply device BP1 turn up. At the time when the pump P1 is started, since the sealed pressure in the pressure tank 30 is reduced, the discharge side pressure of the water supply device BP1 is a low value that is lower than the starting pressure of the pump P1. For this reason, the deviation between the predetermined target pressure and the discharge side pressure of the first water supply device BP1 is large, and the control unit CN1 issues a command to the inverter INV1 to rapidly increase the rotational speed of the pump P1. As a result, as shown in FIG. 5, the discharge-side pressure of the first water supply device BP1 increases greatly.

  The movement of the suction side pressure of the second water supply device BP2 is interlocked with the movement of the discharge side pressure of the first water supply device BP1. As can be seen from the comparison between the graph of FIG. 4 and the graph of FIG. 5, when the sealed pressure of the pressure tank 30 is reduced, the suction side pressure of the second water supply device BP2 is greatly reduced immediately after the pump P2 is started. And then rises significantly. The control unit CN2 of the second water supply device BP2 detects a decrease in the sealed pressure of the pressure tank 30 based on the fluctuation of the suction side pressure of the second water supply device BP2.

  Hereinafter, the operation of the control unit CN2 that detects a decrease in the sealed pressure of the pressure tank 30 will be described. A predetermined pressure drop detection value is stored in advance in the control unit CN2. The control unit CN2 monitors the suction side pressure of the second water supply device BP2 based on the output value of the pressure sensor PS21. When the sealed pressure in the pressure tank 30 is reduced, the suction side pressure of the second water supply device BP2 is greatly reduced each time the pump P2 is started, as shown in FIG. Therefore, when the suction side pressure of the second water supply device BP2 drops to this pressure drop detection value at the start of the pump P2, the control unit CN2 reduces the sealed pressure of the pressure tank 30 beyond the allowable limit. Judge. And control part CN2 issues the warning which shows that the enclosure pressure of pressure tank 30 is not in a normal range, when the suction side pressure at the time of starting falls to a pressure fall detection value.

  Here, depending on how water is used on the higher floors (typically, when a large amount of water is used suddenly), even when the pressure in the pressure tank 30 is within the normal range, There is also a possibility that the suction side pressure may drop to the pressure drop detection value. Therefore, the control unit CN2 counts the number of times that the suction side pressure of the second water supply device BP2 has decreased to the pressure drop detection value when the pump P2 is started, and the counted number reaches the preset number of times. In such a case, it may be determined that the sealed pressure in the pressure tank 30 has dropped below the allowable limit. The number of times may be counted by counting the number of times the suction side pressure of the second water supply device BP2 has dropped to the pressure drop detection value continuously every time the pump P2 is started. Depending on how it is used (typically, when the flow switch SW2 is continuously used with a small amount of water that is the set value of the flow switch SW2), even if the sealed pressure of the pressure tank 30 is not within the normal range, Since there is a possibility that the suction side pressure at the start does not drop to the pressure drop detection value, simply count the number of drops to the pressure drop detection value without considering the continuity at the start of the pump P2. Also good.

  Next, another example of the operation of the control unit CN2 that detects a decrease in the sealed pressure of the pressure tank 30 will be described. The control unit CN2 stores a predetermined pressure increase detection value in advance. If the sealed pressure in the pressure tank 30 is greatly reduced, the pump P1 is started immediately after the pump P2 is started, as shown in FIG. Further, immediately after the pump P1 is started, the suction side pressure of the second water supply device BP2 increases greatly. Therefore, when the suction side pressure of the second water supply device BP2 rises to this pressure rise detection value at the start of the pump P2, the control unit CN2 reduces the sealed pressure of the pressure tank 30 beyond the allowable limit. Judge. Then, the control unit CN2 issues an alarm indicating that the sealed pressure in the pressure tank 30 is not within the normal range when the suction side pressure at the time of startup rises to the pressure rise detection value.

  Also in this example, it is possible to detect a decrease in the sealed pressure in the pressure tank 30 based on the number of times the suction side pressure of the second water supply device BP2 has increased to the pressure increase detection value. That is, the control unit CN2 counts the number of times that the suction side pressure of the second water supply device BP2 has increased to the pressure increase detection value when the pump P2 is started, and this counted number reaches the preset number. In such a case, it may be determined that the sealed pressure in the pressure tank 30 has dropped below the allowable limit. The number of times may be counted by counting the number of times that the suction side pressure of the second water supply device BP2 has risen to the pressure increase detection value continuously every time the pump P2 is started, and every time the pump P2 is started. Without considering the continuity, the number of times of rise to the pressure rise detection value may be simply counted.

  Next, still another example of the operation of the control unit CN2 that detects a decrease in the sealed pressure of the pressure tank 30 will be described. A predetermined pressure difference detection value is stored in advance in the control unit CN2. If the sealed pressure in the pressure tank 30 is greatly reduced, as shown in FIG. 5, immediately after the pump P2 is started, the suction side pressure of the second water supply device BP2 is greatly reduced, and the pump P1 is further started. Immediately after that, the suction side pressure of the second water supply device BP2 rises greatly. Therefore, at the start of the pump P2, the control unit CN2 is the pressure between the lowest pressure at which the suction side pressure of the second water supply device BP2 is the lowest and the highest pressure at which the suction side pressure of the second water supply device BP2 is highest. The difference (absolute value) is calculated, and when the pressure difference reaches a predetermined pressure difference detection value, it is determined that the sealed pressure in the pressure tank 30 has decreased beyond the allowable limit. Then, the control unit CN2 issues an alarm indicating that the sealed pressure in the pressure tank 30 is not within the normal range when the pressure difference reaches a predetermined pressure difference detection value.

  In this example as well, it is possible to detect a decrease in the sealed pressure in the pressure tank 30 based on the number of times the pressure difference has reached a predetermined pressure difference detection value. That is, the control unit CN2 counts the number of times that the pressure difference reaches a predetermined pressure difference detection value when the pump P2 is started, and when the counted number reaches a preset number of times, the pressure tank 30 It may be determined that the enclosure pressure has decreased beyond the allowable limit. The number of times may be counted continuously when the pump P2 starts, and the number of times when the pressure difference reaches a predetermined pressure difference detection value may be counted. Instead, the number of times that the pressure difference has reached a predetermined pressure difference detection value may be simply counted.

  By such a detection operation of the control unit CN2, the second water supply device BP2 can detect an abnormal drop in the sealed pressure in the pressure tank 30 without directly measuring the sealed pressure in the pressure tank 30. Therefore, the maintainability of the pressure tank 30 is improved. Furthermore, since an alarm issued from the control unit CN2 prompts replenishment of gas to the pressure tank 30, an abnormality in the water supply operation due to a decrease in the sealed pressure of the pressure tank 30 can be prevented in advance.

  In the present embodiment, only one pressure tank 30 is provided, but a plurality of pressure tanks may be provided. When a plurality of pressure tanks are connected to the first water distribution pipe 7, a decrease in the enclosed pressure (decrease in the amount of water that can be maintained while keeping the pressure high) as a whole of the plurality of pressure tanks is detected. . The pressure tank PT1 is a pressure tank provided in the water supply device BP1, but is connected to the first water pipe 7. Therefore, the sealed pressure of the pressure tank PT1 is also a target of detection. However, since the volume of the pressure tank 30 is usually much larger than the volume of the pressure tank PT1, the decrease in the detected sealed pressure is the same as the sealed pressure of the pressure tank 30. The decline becomes dominant. However, if there is a sufficient installation space in the water supply device BP1, the installation of the pressure tank 30 can be omitted by increasing the volume of the pressure tank PT1.

  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 main pipe 5 Introductory pipe 7 1st water distribution pipes 9 and 10 Water supply taps 12 and 13 Branch pipe 15 2nd water distribution pipe 20 Pressure reduction type backflow preventer 30 Pressure tank BP1, BP2 Water supply apparatus M1, M2 Motor INV1 , INV2 Inverter CV1, CV2 Check valve SW1, SW2 Flow switch PS11, PS12, PS21, PS22 Pressure sensor PT1, PT2 Pressure tank CN1, CN2 Controller CB1, CB2 Cabinet L1, L2 Discharge pipe

Claims (6)

A pressurized water supply system for supplying water to a building,
A first water supply for the lower floor connected to the water main,
A second water supply device for a high floor connected to the first water supply device in series and arranged at a position higher than the first water supply device;
A pressure tank connected to a water pipe connecting the first water supply device and the second water supply device;
Each of the first water supply device and the second water supply device has a pump,
In the second water supply device, when the suction side pressure of the second water supply device is reduced to a predetermined pressure drop detection value when the pump of the second water supply device is started, the sealed pressure of the pressure tank is normal. A pressure-increasing water supply system characterized by issuing an alarm indicating that it is not within range.   The second water supply device counts the number of times that the suction side pressure of the second water supply device has decreased to the pressure drop detection value when the pump of the second water supply device is started, and the number of times is preset. The increased pressure water supply system according to claim 1, wherein when the number of times is reached, the warning is issued. A pressurized water supply system for supplying water to a building,
A first water supply for the lower floor connected to the water main,
A second water supply device for a high floor connected to the first water supply device in series and arranged at a position higher than the first water supply device;
A pressure tank connected to a water pipe connecting the first water supply device and the second water supply device;
Each of the first water supply device and the second water supply device has a pump,
In the second water supply device, when the suction side pressure of the second water supply device rises to a predetermined pressure increase detection value when the pump of the second water supply device is started, the sealed pressure of the pressure tank is normal. A pressure-increasing water supply system characterized by issuing an alarm indicating that it is not within range.   The second water supply device counts the number of times that the suction side pressure of the second water supply device has increased to the pressure increase detection value when the pump of the second water supply device is started, and the number of times is preset. The increased pressure water supply system according to claim 3, wherein when the number of times is reached, the alarm is issued. A pressurized water supply system for supplying water to a building,
A first water supply for the lower floor connected to the water main,
A second water supply device for a high floor connected to the first water supply device in series and arranged at a position higher than the first water supply device;
A pressure tank connected to a water pipe connecting the first water supply device and the second water supply device;
Each of the first water supply device and the second water supply device has a pump,
In the second water supply device, the lowest pressure at which the suction side pressure of the second water supply device is the lowest when the pump of the second water supply device is started and the highest pressure at which the suction side pressure of the second water supply device is the highest Calculating a pressure difference from the pressure, and when the pressure difference reaches a predetermined pressure difference detection value, an alarm is generated to indicate that the sealed pressure of the pressure tank is not within a normal range. Water supply system.   The second water supply device counts the number of times the pressure difference has reached the pressure difference detection value when the second water supply device is pumped, and when the number of times reaches a preset number of times, The pressure-increasing water supply system according to claim 5, wherein an alarm is issued.

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