JP7009159B2 - Water supply device - Google Patents

Description

The present invention relates to a water supply device.

Traditionally, water supply facilities equipped with water supply devices have been widely used to supply water to buildings. The water supply system for water supply equipment is from the elevated water tank system, in which water pressurized by the pump of the water supply device is stored in the elevated water tank installed on the roof of the building and naturally dropped to the water supply target (for example, a faucet). The direct delivery method, which transfers water directly to the water supply target by a pump, has been moved to, and in many of the newly constructed buildings, the direct delivery type water receiving tank method and the direct water supply method that increases the water main pressure have become mainstream. There is. Therefore, many of the buildings that have adopted the elevated water tank system are more than 30 years old.

In recent years, in urban areas, while updating and maintaining the electrical equipment and water supply and drainage equipment of buildings, they continue to use the buildings themselves without rebuilding them, or renovate old condominiums and buildings and resell them with added value. .. As the building is used for a long period of time without being demolished in this way, the water supply equipment that has reached the end of its life is regularly renewed. At this time, it is preferable to update the water supply system from the initial elevated water tank system when the building was completed to the current mainstream direct delivery system. However, compared to the elevated water tank type water supply equipment, the direct delivery type water supply equipment has a higher pressure applied to the pipes in the building because the discharge pressure of the pump affects the pipes in the building. For this reason, if the direct delivery type is to be adopted, the pressure resistance of the pipes and valves at the time of completion in the old building will be insufficient, and it is often necessary to replace all the water pipes in the building. Therefore, even if the latest water supply device that can be used for direct delivery is installed, the water stored in the elevated water tank must be naturally dropped to the water demand destination due to the cost and structure of the plumbing work of the building. Not all buildings.

In the direct water supply device, the operation stop of the pump is controlled by the discharge pressure of the pump. Specifically, the pump is started when the discharge pressure of the pump drops, and the pump is stopped when the flow rate on the discharge side of the pump drops. Further, in the elevated water tank system, the inflow port of the elevated water tank is connected so as to be located above the water stored in the elevated water tank. Then, in the elevated water tank type water supply facility, the pump operates based on the water level of the water stored in the elevated water tank. (Patent Document 1) Since the control method of the pump is different as described above, in the latest water supply device that can support the direct delivery type, the direct delivery type and the elevated water tank method can be selected by changing the setting.

Japanese Unexamined Patent Publication No. 8-277781

Here, since the elevated water tank and the water supply device are installed at separate locations, when the pump is operated at the water level of the elevated water tank as in Patent Document 1, the operation of the pump and the water level of the elevated water tank are performed. It is difficult to confirm the fluctuation of the water supply at the same time. In particular, in the elevated water tank method, a full water alarm is issued if the pump is not stopped before the water is full, but after that, when water is used in the building, the full water condition is resolved and the water used in the building is used. When the number decreases, the elevated water tank becomes full again, and as a result, the full water warning is repeatedly issued and canceled. For example, even if a full water warning is issued in the middle of the night when the amount of water used is low and a maintenance worker is called, the full water warning is canceled when the maintenance staff comes to the site the next morning, causing the maintenance staff to reach a full water state. It was difficult to identify the equipment.

The present invention has been made in view of the above-mentioned circumstances. In a water supply device in which an elevated water tank is connected to the downstream side of the water supply device, the water level of the elevated water tank can be adjusted while utilizing the pump control of the direct water supply device. One of the purposes is to properly detect anomalies that rise to a water level that leads to a full water level. Further, one of the purposes is to prevent the alarm from being repeatedly detected and canceled when the water level of the elevated water tank rises to a water level that reaches a full state. Furthermore, one of the purposes is to propose a water supply device that can easily identify the cause of the rise of the water level of the elevated water tank to the full water level.

(Form 1) According to the first form, there is proposed a water supply device that is connected to an elevated water tank installed higher than the water supply target via a constant water level valve and supplies water to the water supply target via the elevated water tank. Such a water supply device includes a pump that transfers water to an elevated water tank, a pressure gauge that measures the discharge pressure of the pump, and a control unit that controls the pump based on the discharge pressure of the pump measured by the pressure gauge. To prepare for. Then, the control unit sets the water level of the elevated water tank to the first water level or higher, which is a predetermined water level equal to or higher than the closed water level at which the constant water level valve is closed, based on the signal from the water level gauge that detects the water level of the elevated water tank. A constant water level valve alarm is detected when it is determined that the water level has reached. According to the first embodiment, it is possible to detect an abnormality in the constant water level valve and detect a constant water level valve alarm.

(Form 2) According to Form 2, in the water supply device of Form 1, when the constant water level valve alarm is detected, the pump does not reach at least the water level of the elevated water tank to the first water level or higher. When started twice, the alarm of the constant water level valve is canceled. According to the second embodiment, it is possible to suppress the repeated detection and cancellation of the constant water level valve alarm. In addition, when the worker arrives at the installation site of the water supply device, even if the water is used in the water supply target after the detection of the constant water level valve alarm and the water level of the elevated water tank drops below the first water level, the constant water level Valve alerts continue, increasing the likelihood that workers will be able to identify anomalies in the constant water level valve.

(Form 3) According to the third form, in the water supply device of the first or second form, the control unit counts the number of times that the water level of the elevated water tank becomes the second water level or more from less than the predetermined second water level above the closed water level. When the number of times exceeds a predetermined number of times, it is determined that the water level has reached the first water level or higher. According to the third embodiment, the control unit can prevent the constant water level valve alarm from being detected when the water level is erroneously detected by a wave or the like on the water surface of the elevated water tank.

(Form 4) According to the fourth form, in any one of the water supply devices of the first to third forms, the control unit reaches the forced stop water level or higher, which is a predetermined water level equal to or higher than the closed water level, in the elevated water tank. When it is determined that the pump is forcibly stopped. According to the fourth form, it is possible to prevent water from overflowing from the elevated water tank.

(Form 5) According to Form 5, in the water supply device of Form 4, when the control unit detects the constant water level valve alarm, the water level of the elevated water tank changes from less than the forced stop water level to higher than the forced stop water level. When the number of times is counted and it is determined that the number of times exceeds a predetermined number, the forced stop water level is changed to a water level lower than the full water level at which the elevated water tank is full. According to the fifth embodiment, it is possible to prevent the elevated water tank from becoming full when an abnormality occurs in the constant water level valve.

(Form 6) According to Form 6, in any one of the water supply devices of Forms 1 to 5, the control unit detects the constant water level valve alarm and provides information on the water level of the elevated water tank during the constant water level valve alarm. Store in non-volatile memory. According to the sixth embodiment, when the power supply of the water supply device is shut off and restarted, it is possible to refer to the determination state for detecting and canceling the constant water level valve alarm before the power cutoff.

(Form 7) According to Form 7, in any one of the water supply devices of Form 1 to 6, the control unit cancels the constant water level valve alarm when a predetermined external input is made. According to the seventh embodiment, the constant water level valve alarm can be canceled by an operator or the like inputting an external input.

(Form 8) According to Form 8, a method for controlling a water supply device is proposed. Such a water supply device includes a pump and a control device for controlling the pump. As a water supply system, the water supply device has a high water tank system in which an elevated water tank installed higher than the water supply target is connected to the discharge side of the water supply device, and a water supply target is connected to the discharge side of the water supply device. You can choose between the direct delivery type and the direct delivery type. In such a control method of the water supply device, when the direct delivery type is selected, the control device pumps so that the discharge pressure of the pump starts at a predetermined starting pressure or less and the discharge flow rate of the pump stops at an insufficient amount of water. When the elevated water tank method is selected, the control device automatically opens and closes the constant water level valve provided in the water supply pipe that forms the discharge pipe of the pump. While controlling the start and stop, the pump stops when the water level in the elevated water tank reaches the forced stop water level or higher. According to the eighth embodiment, when the elevated water tank method is selected, it is possible to prevent water from overflowing from the elevated water tank while utilizing the automatic start / stop control.

(Form 9) According to the ninth aspect, in the control method of the water supply device of the eighth aspect, the water supply device includes a flow rate detector that detects a state of an insufficient water amount in which the discharge amount of the pump drops to a predetermined flow rate or less. When the elevated water tank method is selected, the flow rate detector does not detect the state of insufficient water volume after the pump is stopped because it is determined that the water level of the elevated water tank has reached the forced stop water level or higher. The flow rate detector determines that it is abnormal. According to the ninth embodiment, it can be specified that the water level of the elevated water tank has reached the forced stop water level or higher due to the abnormality of the flow rate detector.

(Form 10) According to Form 10, in the control method of the water supply device of Form 9, the control device determines that the water level of the elevated water tank has reached the forced stop water level or higher, and that the flow rate detector is abnormal. The thing that was done is memorized in the storage part. According to the tenth aspect, it is confirmed that the water level of the elevated water tank has reached the forced stop water level or higher and that the flow rate detector has determined to be abnormal by referring to the information stored in the storage unit. Can be done.

It is a figure which shows an example of the water supply equipment which concerns on embodiment of this invention. It is a flowchart which shows an example of the process about the water level of an elevated water tank executed by a control unit. It is a flowchart which shows an example of a pump control process executed by a control part. It is a flowchart which shows an example of the constant water level valve alarm determination processing executed by a control unit. It is a flowchart which shows an example of the constant water level valve alarm cancellation processing executed by a control unit. It is a figure which shows an example of the detection of the water level of an elevated water tank, the operation / stop of a pump, and the constant water level valve alarm as a time chart. It is a figure which shows another example of the water level of an elevated water tank, the start / stop of a pump, and the detection of a constant water level valve alarm as a time chart. It is a flowchart which shows an example of the forced stop water level change process executed by the control unit 40. It is a figure which shows the time chart for demonstrating the change of the forced stop water level. It is a figure which shows an example of the water supply equipment of the elevated water tank system. It is a figure which shows an example of the direct delivery type water supply equipment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a diagram showing an example of a water supply facility 1000 according to an embodiment of the present invention. The water supply facility 1000 is mainly a facility for supplying tap water to a building such as a detached house, a condominium, an office building, a commercial facility, or a school. As shown in FIG. 1, the water supply equipment 1000 is composed of a water supply device 10, an elevated water tank 110, and a constant water level valve 108 that opens and closes the flow path of the water supply pipe 107, and the suction port of the water supply device 10 is an introduction pipe 105. It is connected to a water main 104 which is a water supply source or a water receiving tank (not shown) via. Further, the discharge port of the water supply device 10 is connected to the elevated water tank 110 by a water supply pipe 107 provided with a constant water level valve 108. The elevated water tank 110 is installed at a height such as the roof of a building where a water pressure sufficient for water supply can be obtained at a water supply target (for example, a faucet) 132 on the top floor. The water supply device 10 pressurizes the water from the water main 104 or the water receiving tank, temporarily stores it in the elevated water tank 110, and supplies water to the water supply target 132 on each floor by falling water from the elevated water tank 110. Hereinafter, the water supply method in which the water pressurized by the pump 20 of the water supply device 10 is stored in the elevated water tank 110 installed on the roof of the building higher than the water supply target 132 and supplied to the water supply target 132 by natural drop is high. The water supply system is referred to as a water tank system, and the water supply system in which water pressurized by the pump 20 is directly supplied to the water supply target 132 is referred to as a direct water supply system. That is, in the elevated water tank system, the elevated water tank 110 is connected to the discharge side of the water supply device 10 via the water supply pipe 107, and in the direct delivery type, the water supply target (for example, a faucet) is connected to the discharge side of the water supply device 10. ) 132 is connected via the water supply pipe 107.

First, the elevated water tank 110 of the present embodiment will be described. A water supply device 10 is connected to the upstream side of the elevated water tank 110 via a water supply pipe 107 forming a discharge pipe of the pump 20. The water supply pipe 107 is provided with a constant water level valve 108. In the present embodiment, the constant water level valve 108 is composed of a solenoid valve and is controlled by the control unit 40 of the water supply device 10. However, the constant water level valve 108 may be mechanically opened and closed according to the water level in the elevated water tank 110. A water supply target 132 on each floor of the building is connected to the downstream side of the elevated water tank 110 via a connecting pipe 116. Further, in order to avoid temporary water outage such as maintenance of the constant water level valve 108, a bypass pipe 107a that bypasses the constant water level valve 108 is provided in the water supply pipe 107, and a sluice valve 108a that shields the flow path of the bypass pipe 107a is further provided. It is good to provide it.

Further, the elevated water tank 110 is provided with an electrode type level switch 120 which is a water level gauge for detecting the water level in the elevated water tank 110. The detection signal by the electrode type level switch 120 is input to the control unit 40 of the water supply device 10. The electrode type level switch 120 includes a plurality of electrode rods 121 to 125 arranged in the elevated water tank 110. The plurality of electrode rods 121 to 125 detect the common electrode rod 121, the electrode rod 122 for detecting the reduced water level for the water decrease alarm, and the open water level for opening the constant water level valve 108 in the order in which the low water level can be detected. The electrode rod 123 for closing the constant water level valve 108, the electrode rod 124 for detecting the closed water level for closing the constant water level valve 108, and the electrode rod 125 for detecting the full water level for the full water alarm. The electrode type level switch 120 is not limited to those having five electrode rods 121 to 125, and may have three, four, or six or more electrode rods. The elevated water tank 110 may be further provided with a float type water level sensor 140, which is a water level meter for detecting the water level in the elevated water tank 110. As an example, the float type water level sensor 140 detects the open water level and the closed water level.

Subsequently, the water supply device 10 of the present embodiment will be described. It is preferable that the water supply device 10 can be selected whether to be used in the elevated water tank system or the direct delivery system. Hereinafter, the water supply device 10 will be described as supplying water by the elevated water tank method. The water supply device 10 includes a pump 20, a motor 21 as a drive unit for driving the pump 20, and an inverter 22 as a frequency converter for driving the motor 21 at a variable speed. Further, the water supply device 10 includes a backflow prevention device 25 and a pressure sensor 29 on the suction side (upstream side) of the pump 20. Further, the water supply device 10 includes a check valve 23, a flow switch 24, a pressure sensor 26, and a pressure tank 28 on the discharge side (downstream side) of the pump 20, and an elevated water tank on the downstream side thereof. A water supply pipe 107 communicating with 110 is connected. If it is not necessary to control the variable speed in the water supply device 10, the inverter 22 may be omitted.

The backflow prevention device 25 is provided in the introduction pipe 105 connected to the suction port of the water supply device 10 to prevent the backflow of water from the water supply device 10 to the water supply main 104. A pressure sensor 29 is provided on the upstream side of the backflow prevention device 25. The pressure sensor 29 is a pressure gauge for measuring the pressure (inflow pressure) on the suction side of the pump 20. Hereinafter, the pressure value detected by the pressure sensor 29 is referred to as "inflow pressure".

In the example shown in FIG. 1, two sets of a pump 20, a motor 21, a check valve 23, and a flow switch 24 are provided, and these are provided in parallel. In addition, one set or three or more sets of pump 20, motor 21, check valve 23, and flow switch 24 may be provided. By providing a plurality of pumps 20, when some of the pumps 20 become inoperable, water supply is continued by another pump 20 that can be operated to avoid water interruption as much as possible. Further, in the example shown in FIG. 1, a bypass pipe 27 for supplying water only by the pressure of the water main 104 is provided in parallel with the pump 20, the motor 21, the check valve 23, and the flow switch 24. There is. The bypass pipe 27 is provided with a check valve 27a.

The check valve 23 is provided in the discharge pipe 32 connected to the discharge port of the pump 20 to prevent backflow of water when the pump 20 is stopped. A flow switch 24 is provided on the downstream side of the check valve 23. The flow switch 24 detects a state in which the flow rate of water flowing through the discharge pipe 32 has dropped to a predetermined value, that is, a state of an insufficient water amount (small amount of water) in which the discharge amount of the pump 20 has dropped to a predetermined flow rate or less. It is a flow rate detector. The flow switch 24 may be provided in the discharge header of the pump 20. A pressure sensor 26 and a pressure tank 28 are provided on the downstream side of the flow switch 24 in the discharge pipe 32. The pressure sensor 26 is a pressure gauge for measuring the discharge pressure of the pump 20. Hereinafter, the pressure value detected by the pressure sensor 26 is referred to as “discharge pressure”. If it is not necessary to control the variable speed in the water supply device 10, the pressure gauge for measuring the discharge pressure of the pump 20 operates when the pressure of the fluid discharged from the pump 20 reaches a predetermined starting pressure. It may be a pressure switch. The pressure tank 28 is a pressure retainer for holding the discharge pressure while the pump 20 is stopped.

The water supply device 10 includes a control unit 40 that controls the pump 20 to control the water supply operation. As shown in FIG. 1, the control unit 40 includes a storage unit 41, a calculation unit 42, an I / O unit 47, an operation panel 44, and a communication unit 48.

As the storage unit 41, ROM, HDD, EEPROM, FeRAM, non-volatile memory such as flash memory, and volatile memory such as RAM may be used. The storage unit 41 stores a control program for controlling the water supply device 10 and various data related to the water supply device 10 such as device information, set value information, maintenance information, history information, abnormality information, and operation information. In the water supply device 10 of the present embodiment, if it is possible to select whether to use the elevated water tank method or the direct delivery type, a control program capable of supporting both the elevated water tank method and the direct delivery type. It is good to store. If the storage unit 41 has a non-volatile storage area, these may be stored in the non-volatile storage area.

A CPU is used as the calculation unit 42. The calculation unit 42 performs calculations and the like for controlling each device constituting the water supply device 10 based on the control program and various data stored in the storage unit 41 and the signal input from the I / O unit 47. conduct. In the water supply device 10 of the present embodiment, when it is possible to select whether to use the elevated water tank system or the direct delivery system, it is preferable to execute the control program corresponding to the selected water supply system. Further, the calculation unit 42 controls communication in the communication unit 48, the I / O unit 47, and the like, and controls the display and operation in the operation panel 44. The calculation result in the calculation unit 42 may be stored in the storage unit 41 and output to the I / O unit 47 and the communication unit 48.

As the I / O unit 47, a port, communication, or the like is used. The I / O unit 47 receives detection signals of various sensors such as the pressure sensor 26, the flow switch 24, and the electrode type level switch 120 provided in the elevated water tank 110 and sends them to the calculation unit 42. Further, the I / O unit 47 is provided with an output terminal that outputs a signal to the outside, and as an example of the output terminal, the constant water level valve 108 provided in the water supply pipe 107 to the elevated water tank 110 is connected to the calculation unit 42. Output a command signal. The I / O unit 47 is provided with an external input terminal capable of inputting a signal from the outside, and as an example of the external input terminal, is provided with an interlock terminal 47a for forcibly stopping the pump 20 by the external signal. In addition to or in place of the water supply method switching button 45a described later, a switch is provided on the external input terminal or the board constituting the control unit 40 and used in the elevated water tank method or in the direct delivery type. You may choose. Further, the I / O unit 47 is connected to each other with the inverter 22. The I / O section 47 and the inverter 22 may be connected to each other by communication means such as RS422, 232C, 485.

Here, the arithmetic unit 42 detects a change in the resistance value between the electrode rods 122 to 125 of the electrode type level switch 120 input to the I / O unit 47 and the longest common electrode rod 121, thereby increasing the height. It is detected that the water level in the water tank 110 is higher than the lower ends of the electrode rods 122 to 125 of each electrode rod. That is, in the electrode type level switch 120, when the water level in the elevated water tank 110 is higher than the lower end of each of the electrode rods 122 to 125 and the water is conducted between the electrode rods 122 to 125 and the common electrode rod 121. , The detection signal of each water level is output to the I / O unit 47.

The operation panel 44 is a GUI that can display and change various data stored in the storage unit 41 via the calculation unit 42. Specifically, the operation panel 44 displays device information, setting value information, maintenance information display and setting change, maintenance information, history information display, input, history clearing, abnormality information display and reset, and operation information. Is displayed. The control unit 40 and the operation panel 44 may be on separate boards. In this case, the control unit 40 and the operation panel 44 may be connected by serial communication, wired communication such as a signal line, or wireless communication. When the control unit 40 and the operation panel 44 are used as separate boards, the operation panel 44 may be installed in a place away from the water supply device 10 (for example, a manager's room). Further, the operation panel 44 may include a CPU and control the display operation by the CPU, or may perform communication control with the control unit 40 and the external terminal 80.

The setting unit 45 of the operation panel 44 is an information input unit of the control unit 40, and various inputs such as operation / stop of automatic water supply in the water supply device 10, alarm reset, and setting change of various data are performed by an external operation of the user. Used to perform operations. The setting unit 45 may include an operation button (not shown), a touch panel, or the like. Here, in the present embodiment, the input through the setting unit 45 and the input through the communication unit 48 are referred to as an external input. Information input by an external operation through the setting unit 45 is stored in the storage unit 41. For example, the setting unit 45 can set and change the water supply method of the water supply device 10, the set pressure PA, the minimum pressure PB, the start pressure P0, and the stop pressure P1 as set value information. Further, the setting unit 45 is provided with a water supply method switching button 45a, and by pressing the water supply method switching button 45a, it is possible to select whether to use the elevated water tank method or the direct delivery type. good.

The display unit 46 of the operation panel 44 functions as a user interface and is configured to be able to display various data stored in the storage unit 41. In addition, it may be displayed whether it is an elevated water tank system or a direct delivery system. The water supply device 10 may be installed in an environment with a lot of electrical noise such as a machine room or a pump room. In preparation for such a case, as the display unit 46, a display composed of a 7-segment LED or an indicator lamp that is more resistant to electrical noise than a liquid crystal display and a touch panel, a mechanical pressing button, or the like may be used. .. As a result, even in an external environment where an abnormality occurs in the display operation unit 80A of the external terminal 80 due to electrical noise or the like, the minimum display necessary for operating the water supply device 10 can be displayed on the display unit 46. can. Therefore, the water supply device 10 can be installed even in an environment with a lot of electrical noise. However, the display unit 46 is not limited to a display device that is resistant to electrical noise, and a liquid crystal display device based on a dot matrix method may be used.

The communication unit 48 is configured to be able to communicate with the external terminal 80 by wired communication or wireless communication. Specifically, various information about the water supply device 10 stored in the storage unit 41 is transmitted to the external terminal 80, and the setting change of the set value information from the external terminal 80 is received as the information input unit of the control unit 40. It is sent to the calculation unit 42. As described above, in the present embodiment, the transmission of the signal from the external terminal 80 to the communication unit 48 is included in the "external input" in the water supply device 10. As the wireless communication in the communication unit 48, for example, a technique of short-range wireless communication (NFC: Near Field Communication) can be used. In addition, any method of wireless communication such as Bluetooth (registered trademark) and Wi-Fi can be used. However, NFC is advantageous in that communication can be completed only by bringing the control unit 40 and the external terminal 80 close to each other. Further, as for wired communication, for example, the control unit 40 may be provided with an external connection terminal such as a USB (Universal Serial Bus), and communication may be performed by connecting the external terminal 80 to the external connection terminal, or RS422,232C. , 485 and the like may be used.

The external terminal 80 has a display operation unit 80A, and is configured to communicate with the communication unit 48 of the water supply device 10 so that various data related to the water supply device 10 can be displayed / changed. Specifically, the external terminal 80 receives various data stored in the storage unit 41 from the communication unit 48 of the water supply device 10 and displays them on the display operation unit 80A. Further, the external terminal 80 transmits a change request of various data input by the user by operating the display operation unit 80A to the communication unit 48 of the water supply device 10. The display operation unit 80A can adopt a high-performance display on a liquid crystal screen using a touch input method or a press button method. In this case, the display unit 46 of the water supply device 10 may display simple information, and the external terminal 80 may display a large amount of information. With such a configuration, the external terminal 80 has a plurality of information (for example, set pressure PA, minimum pressure PB, starting pressure P0, stopping pressure P1, target pressure SV, current pressure PV, among various data stored in the storage unit 41. The operation / stop of the pump 20, rotation speed, etc.) can be displayed on the same screen of the display operation unit 80A. As a result, even a user who is unfamiliar with the water supply device 10 can recognize the state of the water supply device 10 and input settings without misunderstanding.

Further, when a general-purpose terminal device (PDA) such as a smartphone, a mobile phone, a personal computer, or a tablet is adopted as the external terminal 80, dedicated application software for acting as the external terminal 80 on these PDAs. May be installed. In this case, a plurality of dedicated application software may be prepared according to the user's level or purpose.

It should be noted that all the functions of the operation panel 44 described above may be implemented by the external terminal 80. This makes it easy to check the status of the water supply device 10 and change the set value information even if the water supply device 10 is installed in a place where it is difficult to operate (for example, the operation panel 44 is near the operator's feet). ..

Next, an example of control by the control unit 40 of the present embodiment will be described. In this embodiment,
The control unit 40 controls the constant water level valve 108 interposed between the water supply device 10 and the elevated water tank 110 based on the detection signal from the electrode type level switch 120. FIG. 2A is a flowchart showing an example of a process relating to the water level of the elevated water tank executed by the control unit 40. This process is repeatedly executed every predetermined time (for example, every several tens of msec, every several hundred msec, every few seconds, etc.) when the water supply device 10 is activated.

In the process relating to the water level of the elevated water tank shown in FIG. 2A, first, the control unit 40 determines whether or not the water level of the elevated water tank 110 is lower than the reduced water level based on the detection signal from the electrode type level switch 120. (S110). Specifically, in the present embodiment, when the water level in the elevated water tank 110 does not reach any of the electrode rods 122 to 125, it is determined that the water level in the elevated water tank 110 is lower than the reduced water level. When the water level of the elevated water tank 110 is lower than the reduced water level (S110: Yes), the control unit 40 reduces the water in the elevated water tank 110 in order to avoid running out of water in the elevated water tank 110. A water reduction warning indicating that the state is in a state is detected and issued (S120). This water reduction warning is canceled when the water level of the elevated water tank 110 reaches the water reduction level or higher. The water reduction alarm may be issued by a buzzer or a display on the display unit 46, or may be issued by outputting a signal to the outside from the communication unit 48 or the I / O unit 47. When the water level of the elevated water tank 110 is equal to or higher than the reduced water level (S110: No), the control unit 40 executes the next process (S130) without detecting the reduced water alarm (S112).

Subsequently, the control unit 40 determines whether or not the water level of the elevated water tank 110 is lower than the open water level based on the detection signal from the electrode type level switch 120 (S130). In the present embodiment, when the water level in the elevated water tank 110 does not reach the electrode rod 123, it is determined that the water level in the elevated water tank 110 is lower than the open water level. When the water level of the elevated water tank 110 is lower than the open water level (S130: Yes), the control unit 40 transmits a control signal to the constant water level valve 108 so that the constant water level valve 108 is opened (S140). By opening the constant water level valve 108, water can be transferred from the water supply device 10 to the elevated water tank 110. When the constant water level valve 108 is open, the control unit 40 keeps the constant water level valve 108 open as it is. On the other hand, when the water level of the elevated water tank 110 is equal to or higher than the open water level (S130: No), the control unit 40 directly executes the next process (S150).

Next, the control unit 40 determines whether or not the water level of the elevated water tank 110 is equal to or higher than the closed water level based on the detection signal from the electrode type level switch 120 (S150). In the present embodiment, when the water level in the elevated water tank 110 reaches the electrode rod 124, it is determined that the water level in the elevated water tank 110 is equal to or higher than the closed water level. When the water level of the elevated water tank 110 is equal to or higher than the closed water level (S150: Yes), the control unit 40 transmits a control signal to the constant water level valve 108 so that the constant water level valve 108 is closed (S160). When the constant water level valve 108 is closed, the transfer of water from the water supply device 10 to the elevated water tank 110 is stopped. The control unit 40 maintains the state of the constant water level valve 108 as it is when the constant water level valve 108 is closed. On the other hand, when the water level of the elevated water tank 110 is lower than the closed water level (S150: No), the control unit 40 directly executes the next process (S170).

Then, the control unit 40 determines whether or not the water level of the elevated water tank 110 is equal to or higher than the full water level based on the detection signal from the electrode type level switch 120 (S170). In the present embodiment, when the water level in the elevated water tank 110 reaches the electrode rod 125, it is determined that the water level in the elevated water tank 110 is equal to or higher than the full water level. When the water level of the elevated water tank 110 is equal to or higher than the full water level (S170: Yes), the control unit 40 detects and issues a full water warning indicating that the elevated water tank 110 is full (S180). , End the process. The full water alarm may be given through a buzzer, a display unit 46, a communication unit 48, or the like, similarly to the water reduction alarm. When the water level of the elevated water tank 110 is lower than the full water level (S170: No), the control unit 40 ends the process as it is without detecting the full water alarm (S172).

In the water supply device 10 of the present embodiment, the water supply operation using the pump 20 is also controlled in response to the opening and closing of the flow path of the water supply pipe 107 by controlling the constant water level valve 108 in this way. Here, the control of the pump 20 by the control unit 40 of the present embodiment will be described. FIG. 2B is a flowchart showing an example of a pump control process executed by the control unit 40. This pump control process is repeatedly executed at predetermined time intervals (for example, every several tens of msec, every several hundred msec, every few seconds, etc.) when the water supply device 10 is automatically operated, and is executed in parallel with FIG. 2A. To. In the pump control process, the control unit 40 uses the constant water level valve 108 to connect the water supply pipe 107 until the discharge pressure drops to the starting pressure P0 (S181: Yes, S182: No) when the pump 20 is stopped. The flow path is closed, and the pump 20 is continuously stopped (S183). Further, when the discharge pressure drops to the starting pressure P0 when the pump 20 is stopped (S181: Yes, S182: Yes), the control unit 40 starts at least one of the pumps 20 (S184). Specifically, the control unit 40 issues a command to the inverter 22 (or the motor 21 if the inverter 22 is not provided) to start driving the pump 20.

When the water level of the elevated water tank 110 is lower than the forced stop water level (S185: Yes) and the small amount of water is not detected (S186: No), the control unit 40 is in operation of the pump 20 (S181: No). ), The flow path of the water supply pipe 107 is opened by the constant water level valve 108, and the operation of the pump 20 is continued (S187). During the operation of the pump 20, the control unit 40 performs control such as constant estimated end pressure control or constant target pressure control according to the set pressure (set pressure PA). Specifically, in the case of constant estimated end pressure control, the control unit 40 uses the rotation speed of the pump 20 and the target pressure control curve so that the pressure at the end of the water supply destination becomes constant at the minimum pressure PB. The target pressure SV with respect to the discharge pressure of the pump 20 is set. In the case of constant target pressure control, the control unit 40 sets the set pressure PA as the target pressure SV so that the pressure on the discharge side of the pump 20 becomes the set pressure PA. Further, in both cases of the estimated terminal pressure constant control and the target pressure constant control, the control unit 40 sets the discharge pressure as the current pressure PV. Then, the command rotation speed of the pump 20 is set by performing the PID calculation based on the deviation between the target pressure SV and the current pressure PV. In the estimated terminal pressure constant control, the set pressure PA is the pressure value at the maximum flow rate, and the minimum pressure PB is the pressure value at the terminal faucet at zero flow rate. Further, when there are a plurality of pumps as in the present embodiment, the control unit 40 also controls the number of pumps according to the amount of water by the number of pumps that can be started at the same time (the number of pumps operating in parallel). The number of pumps operating in parallel may be stored in the storage unit 41 as set value information.

When the pump 20 is in operation (S181: No) and the small amount of water is detected (S186: Yes), the control unit 40 stops the pump 20 with a small amount of water (S188). The flow switch 24 detects the insufficient amount of water when the constant water level valve 108 is normally closed and the flow path of the water supply pipe 107 is closed. Specifically, when the control unit 40 detects an insufficient amount of water by the detection signal from the flow switch 24 (S186: Yes), the control unit 40 controls the rotation speed of the pump 20 so that the discharge pressure reaches the stop pressure P1 in a predetermined time. Perform the accumulator operation. Then, when the discharge pressure reaches the predetermined stop pressure P1, it is determined that the pressure has been accumulated in the pressure tank 28, the accumulator operation is terminated, and the pump 20 is stopped (small amount of water is stopped) (S188). After that, the flow path of the water supply pipe 107 is released by the constant water level valve 108, and the discharge pressure drops to the starting pressure P0 (S182: Yes), so that the control unit 40 restarts the pump 20 (S184). When there are a plurality of pumps as in the present embodiment, it is preferable to rotate the starting pump 20 to prevent water from staying in the pump 20. Further, as the flow rate detector for detecting the state of the underwater amount, a detection means such as detection of a low load by the current value of the motor 21 or detection of the deadline head may be used by a sensor other than the flow switch 24.

The control unit 40 is in the elevated water tank 110 when the pump 20 is in operation (S181: No).
When the water level reaches the forced stop water level or higher (S185: Yes), the pump 20 is forcibly stopped so that the water does not overflow from the elevated water tank 110 (S189). In this case, the control unit 40 waits for the water level of the elevated water tank 110 to reach less than the return water level (S190: Yes), and releases the forced stop of the pump 20. In the following description, as an example, the forced stop water level is the same as the full water level, and the return water level is the same as the open water level. However, the present invention is not limited to these examples, and the forced stop water level and the return water level may be arbitrarily determined.

Subsequently, the operation of the pump 20 accompanying the opening and closing of the constant water level valve 108 described above will be described. When the water level in the elevated water tank 110 drops to a predetermined open water level while the pump 20 is stopped, the control unit 40 opens the constant water level valve 108 (FIGS. 2A and S140). When the discharge pressure drops to a predetermined starting pressure P0 by opening the constant water level valve 108, the control unit 40 starts at least one of the pumps 20 (FIGS. 2B and S184). Then, the discharge pressure is controlled to control the pump 20 so that the discharge pressure of the pump 20 becomes a desired pressure.

When the water level of the elevated water tank 110 reaches a predetermined closed water level or higher due to the transfer of water from the pump 20, the control unit 40 closes the constant water level valve 108 (FIGS. 2A and S160). When the constant water level valve 108 normally closes and closes the flow path of the water supply pipe 107, the flow switch 24 detects an insufficient amount of water and sends the detection signal to the control unit 40. Upon receiving this detection signal, the control unit 40 stops the pump 20 (stops the small amount of water) (FIG. 2B, S188). When water is used again in the building and the water level of the elevated water tank 110 drops, the constant water level valve 108 is opened (FIGS. 2A and S140), the pressure accumulated in the pressure tank 28 during the accumulator operation is released, and the pump 20 is released. A small stop restart is performed (FIG. 2B, S184). In this way, the pump 20 is repeated: a small water amount stop in which the pump 20 is stopped by detecting an insufficient amount of water, and a small stop restart in which the pump 20 is restarted when the discharge pressure drops to the starting pressure P0. The automatic control of is referred to as automatic start / stop control.

As described above, in the water supply device 10 of the present embodiment, the constant water level valve 108 is provided between the water supply device 10 and the elevated water tank 110, and the constant water level valve 108 is opened and closed based on the water level of the elevated water tank 110 to supply water. The flow path of the tube 107 opens and closes. As a result, water can be stored in the elevated water tank 110 by using a program that controls the pump 20 based on the discharge pressure control and the automatic start / stop control. Since the discharge pressure control and the automatic start / stop control can also be used in the direct delivery type, the versatility of the water supply device 10 is improved.

However, when the water level of the elevated water tank 110 becomes equal to or higher than the forced stop water level, which is a predetermined water level equal to or higher than the closed water level (S185: Yes), the water supply device 10 does not allow water to overflow from the elevated water tank 110. The pump 20 is forcibly stopped regardless of the presence or absence of detection of the discharge pressure or the insufficient amount of water. The forced stop of the pump 20 is released when the water level of the elevated water tank 110 becomes lower than the return water level (S191). Then, when the forced stop is released and the discharge pressure drops to the starting pressure P0 again, the pump 20 is started. Here, if the pump 20 is forcibly stopped and the water level in the elevated water tank becomes a water level below the open water level, it takes time for the water level to rise even if the pump 20 operates, and in the worst case, the water is cut off. Will end up. By setting the return water level to a water level higher than the open water level, it is possible to prevent the elevated water tank from becoming low in water.

Further, the water supply device 10 determines whether or not an abnormality has occurred in the constant water level valve 108. FIG. 3A is a flowchart showing an example of the constant water level valve alarm determination process executed by the control unit 40. This constant water level valve abnormality determination process is repeatedly executed every predetermined time (for example, every several tens of msec, every several hundred msec, every few seconds, etc.) or every time the constant water level valve abnormality determination process is completed, and FIGS. 2A and 2B are performed. Is executed in parallel with. The details of the abnormality determination flag Fva will be described later.

When the constant water level valve alarm determination process is executed, the control unit 40 first determines whether or not the water level of the elevated water tank 110 has reached the first water level or higher based on the detection signal from the electrode type level switch 120. (S202). Here, the first water level is a predetermined water level equal to or higher than the closed water level. For example, when the first water level is a full water level, the control unit 40 is from the electrode rod 125 for detecting the full water level of the electrode type level switch 120. Based on the signal, it can be determined that the water level has reached the first water level or higher. The process of S202 is a process of determining whether or not there is a possibility that an abnormality has occurred in the constant water level valve. As described above, when the water level of the elevated water tank 110 is equal to or higher than the closed water level, the constant water level valve 108 is closed, the pump 20 stops a small amount of water, and water is not transferred from the pump 20 to the elevated water tank 110. Therefore, when the constant water level valve 108 can normally close the flow path of the water supply pipe 107, the water level of the elevated water tank 110 is lower than the first water level. Therefore, when the water level of the elevated water tank 110 is lower than the first water level (S202: No), the control unit 40 determines that the constant water level valve 108 is normal, and does not change the value of the abnormality determination flag Fva. (Fva = 0), the constant water level valve abnormality determination process is terminated as it is. In this case, since the control unit 40 determines that the constant water level valve 108 is normal based on the abnormality determination flag Fva, the constant water level valve alarm determination process shown in FIG. 3A is repeatedly executed.

On the other hand, when the water level of the elevated water tank 110 is higher than the first water level (S202: Yes), the control unit 40 is in a state where the constant water level valve 108 cannot normally close the flow path of the water supply pipe 107, and the constant water level valve 108 The constant water level valve alarm is detected and issued (S204). Here, the constant water level valve alarm is an alarm for detecting that an abnormality has occurred in the constant water level valve 108, and when the first water level is the same as the full water level, it is detected and issued at the same time as the full water level alarm. It should be done. Further, the constant water level valve alarm may be issued by using the same means (LED, buzzer, etc.) as the full water level alarm, whereby the parts for displaying the constant water level valve alarm can be eliminated and the display can be performed. The unit 46 can be miniaturized. In this case, it can be confirmed that the water level has once risen to the first water level while the constant water level valve alarm is output even after the water level becomes lower than the full water level and the full water alarm is canceled. Further, the LED may be turned on when the full water level alarm and the constant water level valve alarm are issued, and the LED may be blinked when only the constant water level valve alarm is issued. As a result, the user can recognize that the constant water level valve 108 has an abnormality. Then, the control unit 40 changes the value of the abnormality determination flag Fva (Fva = 1) (S206), and ends the constant water level valve alarm determination process. When the value 1 is set in the abnormality determination flag Fva, the control unit 40 determines that an abnormality has occurred in the constant water level valve 108, and then sets the release determination counter Cva to a value 0 (S207). , The constant water level valve alarm release process shown in FIG. 3B is executed.

FIG. 3B is a flowchart showing an example of the constant water level valve alarm release process executed by the control unit 40. In this constant water level valve alarm release process, it is determined in FIG. 3A that an abnormality has occurred in the constant water level valve 108 based on the abnormality determination flag Fva of the constant water level valve 108 (Fva = 1 is set in S206). After the valve alarm is detected, it is executed by the control unit 40.

When the constant water level valve alarm release process is executed, the control unit 40 first waits for the water level of the elevated water tank 110 to reach below the open water level (S210). As described above, when the water level of the elevated water tank 110 rises to the forced stop water level (full water level) or higher, the pump 20 is forcibly stopped. Therefore, water is not supplied from the pump 20 to the elevated water tank 110, and the water level of the elevated water tank 110 drops due to the use of water in the building. Then, when the water level of the elevated water tank 110 reaches less than the open water level (S210: Yes), the control unit 40 waits for the water level of the elevated water tank 110 to reach the closed water level or higher (S230). As described above, when the water level of the elevated water tank 110 becomes lower than the return water level (open water level), the forced stop of the pump 20 is released. Therefore, when the discharge pressure drops to the starting pressure P0, the pump 20 is started again, water is transferred from the water supply device 10 to the elevated water tank 110, and the water level of the elevated water tank 110 rises. Then, when the water level of the elevated water tank 110 reaches the closed water level or higher (S230: Yes), the control unit 40 determines whether or not the water level of the elevated water tank 110 is lower than the open water level (S240) and the elevated water tank. It is determined whether the water level of 110 is equal to or higher than the first water level (full water level) (S250), and then the water is used in the building to be below the open water level, or the pump 20 does not stop. Wait until the water level rises above the first level. In particular,
When the water level of the elevated water tank 110 is equal to or higher than the open water level and lower than the first water level (S240: No, S250: No), the control unit 40 executes the determination of S240 and S250 again.

Now, consider the case where the water level of the elevated water tank 110 reaches the closed water level or higher (S230: Yes) and the constant water level valve 108 is closed (S160 in FIG. 2A). When the constant water level valve 108 can normally close the flow path of the water supply pipe 107, the pump 20 stops a small amount of water, and then water is used in the building, so that the water level of the elevated water tank 110 drops and is less than the open water level. To. When the water level of the elevated water tank 110 reaches less than the open water level (S240: Yes), the control unit 40 increments the release determination counter Cva by a value of 1 (S260), and whether the release determination counter Cva is equal to or higher than the threshold value Cref1. It is determined whether or not (S280). The release determination counter Cva is reset to a value 0 when the constant water level valve alarm release process is started (S207 in FIG. 3A), and indicates the number of times that Yes is determined in S240. Then, when the release determination counter Cva is less than the threshold value Cref 1 (S280: No), the control unit 40 still determines that an abnormality has occurred in the constant water level valve 108 and continues the constant water level valve alarm (S290). , Return to the process of S210 again. After that, every time the water level of the elevated water tank 110 reaches below the open water level from below the open water level to below the open water level (S210: Yes, S230: Yes, S240), the release determination counter Cva is counted up (S260). ). Then, when the release determination counter Cva reaches the threshold value Cref1 or higher (S280: Yes), the control unit 40 cancels the constant water level valve alarm (S292) and sets the abnormality determination flag Fva to a value 0 to reset (S280: Yes). S294), the constant water level valve alarm release process is terminated. That is, after the control unit 40 determines the abnormality of the constant water level valve 108 in S206, the pump 20 does not reach the first water level (full water level) or higher, and the pump 20 performs the number of times of the threshold value Cref 1. When started, the constant water level valve alarm is canceled. In other words, in the control unit 40, (1) the water level of the elevated water tank 110 reaches below the open water level, (2) the water level of the elevated water tank 110 reaches the closed water level or higher, and (3) the water level of the elevated water tank 110 reaches or higher. The constant water level valve alarm is canceled when it is confirmed the number of times of the threshold value Cref1 that the water level reaches less than the open water level is satisfied in order. Here, the threshold value Clef1 is a threshold value for determining to cancel the constant water level valve alarm when the release determination counter Cva reaches this value, and predetermined values such as value 1, value 2, and value 3 are used. It should be done. When the threshold value Cref1 is a value 1, the constant water level valve alarm is canceled once (1) to (3) are satisfied. Then, the control unit 40 also ends the constant water level valve alarm determination process of FIG. 3A by ending the constant water level valve alarm release process of FIG. 3B, and then executes the constant water level valve alarm determination process of FIG. 3A again.

Further, when the water level of the elevated water tank 110 reaches the first water level or higher (S250: Yes) while determining the cancellation of the constant water level valve alarm, the control unit 40 sets the value 0 in the release determination counter Cva. And reset (S270). As described above, when the water level of the elevated water tank 110 reaches the closed water level or higher, the constant water level valve 108 is closed. Therefore, when the constant water level valve 108 is normal, water is not transferred from the pump 20 to the elevated water tank 110 thereafter. The water level of the elevated water tank 110 does not rise. Nevertheless, when the water level of the elevated water tank 110 reaches the first water level (full water level) or higher, there is a possibility that some trouble may occur in which the flow path of the water supply pipe 107 cannot be closed by the constant water level valve 108. Therefore, when the water level of the elevated water tank 110 reaches the first water level or higher while determining the cancellation of the constant water level valve alarm, the control unit 40 resets the determination up to that point.

In the water supply device 10 of the embodiment described above, the control unit 40 detects and issues a constant water level valve alarm when it is determined that the water level of the elevated water tank 110 has reached the full water level (first water level) or higher. As a result, the user can recognize that the constant water level valve 108 has been determined to have a problem. Further, the control unit 40 determines the constant water level when the pump is started at least twice without the water level of the elevated water tank 110 reaching the first water level (full water level) or higher when the constant water level valve alarm is detected. Cancel the valve alarm. For example, if foreign matter is caught in the constant water level valve 108 and the flow path of the water supply pipe 107 cannot be closed, the foreign matter can be removed by operating the pump 20 several times and the constant water level valve 108 can be closed normally. Probability is high. In this way, by automatically canceling the abnormality of the constant water level valve, the number of times the maintenance staff goes to the site can be reduced, and the constant water level valve alarm is repeatedly detected and canceled due to the fluctuation of the water level of the elevated water tank 110. Can be suppressed. Moreover, when the water level of the elevated water tank 110 reaches the first water level (full water level) or higher before the positive determination of S240 is made in the constant water level valve alarm cancellation process, the control unit 40 (S250: Yes). , The release determination counter Cva is reset and the constant water level valve alarm release process is executed from the beginning. This makes it possible to more preferably suppress the repeated detection and cancellation of the constant water level valve alarm. Then, by continuing the constant water level valve alarm, the maintenance staff can recognize that the constant water level valve alarm is not temporary. Therefore, it is possible to identify that the cause of the rise in the water level of the elevated water tank is a malfunction of the constant water level valve.

In the time charts of FIGS. 3C and 3D described below, the operation of each step in FIGS. 2A, 2B, 3A and 4B will be described using the same reference numerals. Further, in the description of FIGS. 3C and 3D, the first water level and the forced stop water level are the water levels detected by the electrode rod 125 which is the same as the full water level, and the return water level of the forced stop of the pump 20 is the open water level of the constant water level valve. The water level is the same as that detected by the electrode rod 123.

FIG. 3C is a diagram showing an example of the detection of the water level of the elevated water tank 110, the operation / stop of the pump 20, and the constant water level valve alarm as a time chart. The operation when the flow path of the water supply pipe 107 cannot be closed, and then the trouble is solved and the constant water level valve 108 can close the flow path of the water supply pipe 107 is shown. In FIG. 3C, at time t11, the water level of the elevated water tank 110 reaches the forced stop water level or higher in a state where the constant water level valve 108 cannot close the flow path of the water supply pipe 107 (FIGS. 2B, S185: No, FIG. 3A, S202: Yes), the control unit 40 forcibly stops the pump 20 (FIG. 2B, S189). At the same time, since the water level is also higher than the first water level, a constant water level valve alarm is detected as an abnormality of the constant water level valve (FIGS. 3A, S204). This prevents water from overflowing from the elevated water tank 110 without supplying water from the pump 20 to the elevated water tank 110, and the water level of the elevated water tank 110 drops due to the use of water in the building. Then, when the water level of the elevated water tank 110 reaches less than the return water level at time t12 (FIG. 2B, S190: Yes), the control unit 40 releases the forced stop of the pump 20 (FIG. 2B, S191). At this time, since the water level of the elevated water tank 110 is lower than the open water level (FIGS. 2A, S130: Yes, FIG. 3B, S210: Yes), the constant water level valve 108 is opened (FIGS. 2A, S140). When the control unit 40 determines that the discharge pressure of the pump 20 has dropped to the starting pressure P0 (FIGS. 2B, S182, Yes), the control unit 40 starts the pump 20 (FIG. 2B, S184). As a result, water is supplied from the pump 20 to the elevated water tank 110, and the water level of the elevated water tank 110 rises.

In the example of FIG. 3C, subsequently, at time t13, the water level of the elevated water tank 110 reaches the closed water level or higher (FIG. 3B, S230: Yes), and the constant water level valve 108 is closed (FIGS. 2A, S160). At t13, the constant water level valve 108 was able to normally close the flow path of the water supply pipe 107, and the pump 20 stopped a small amount of water (FIGS. 2B and S188). As a result, the water level of the elevated water tank 110 drops again due to the use of water in the building, and at time t14, the water level of the elevated water tank 110 does not reach the full water level (first water level) or higher and falls below the open water level. It has reached. From t13 to t14, the pump 20 is stopped with a small amount of water (FIGS. 2B, S182, No, S183). At t14, the constant water level valve 108 is opened below the open water level (FIG. 2A, S130: Yes, S140), and the control unit 40 reduces the discharge pressure of the pump 20 to the starting pressure P0 (FIG. 2B, S182: Yes). ) Then the pump 20 is started (FIG. 2B, S184). At this time, a positive determination is made in S240 of FIG. 3B, and the release determination counter Cva is incremented by a value of 1 (S260). However, at time t14, it is still determined that the release determination counter Cva (value 1) is less than the threshold value Cref 1 (value 2) (S280: No), and the control unit 40 issues a constant water level valve abnormality and a constant water level valve alarm. Continue (S290). That is, at this time, although the pump 20 detects the small amount of water when the constant water level valve 108 is closed and the small amount of water is stopped, the control unit 40 still determines that the problem of the constant water level valve 108 has been solved. Judging that it cannot be done, the constant water level valve alarm is continued. Then, in the example of FIG. 3C, after the water level of the elevated water tank 110 reaches the closed water level or higher (time t15, S230: Yes), the water level does not reach the full water level (first water level) or higher and falls below the open water level. It has reached (time t16, S240: Yes). As a result, the release determination counter Cva is incremented again by the value 1 (S260), and the release determination counter Cva reaches the threshold value Clef1 (value 2) or more (S280: Yes). In this case, the control unit 40 determines that the malfunction of the constant water level valve 108 has been resolved, and cancels the abnormality of the constant water level valve 108 and the constant water level valve alarm (S292). By such control, it is possible to prevent the constant water level valve alarm from being repeatedly detected and canceled due to a malfunction of the constant water level valve 108.

FIG. 3D is a diagram showing as a time chart another example of the water level of the elevated water tank 110, the start / stop of the pump 20, and the detection of the constant water level valve alarm, and the constant water level valve 108 has some trouble at t21. The operation when the flow path of the water supply pipe 107 cannot be closed and the problem is not solved after that is shown. In FIG. 3D, at time t21, as in the case of time t11 in FIG. 3C, when the water level of the elevated water tank 110 reaches the full water level or higher, the control unit 40 forcibly stops the pump 20 and at the same time (FIGS. 2B and S189). , Detects and issues a constant water level valve alarm (FIG. 3A, S204). Further, at time t22, as in the case of time t12 in FIG. 3C, when the water level of the elevated water tank 110 reaches less than the open water level, the control unit 40 releases the forced stop of the pump 20 (FIGS. 2B and S191). ).

Subsequently, in the example of FIG. 3D, the constant water level valve 108 closes the flow path of the water supply pipe 107 even though the water level of the elevated water tank 110 reaches the closed water level or higher and the constant water level valve 108 is closed at time t23. Since the control unit 40 cannot detect the small amount of water (FIG. 2B, S186: No), the control unit 40 continues the operation of the pump 20 (FIG. 2B, S187), so that the water level continues to rise and at time t24. The water level of the elevated water tank 110 has reached the full water level (first water level). At this time, the control unit 40 forcibly stops the pump 20 (FIG. 2B, S189). Further, a positive determination is made in S250 of FIG. 3B, and the release determination counter Cva is reset to a value of 0 (S270). In this case, since it is determined that the release determination counter Cva is less than the threshold value Cref 1 (S280: No), the constant water level valve alarm is continued (S290). That is, when the water level of the elevated water tank 110 reaches the first water level again when the constant water level valve alarm is detected, the control unit 40 causes the constant water level valve 108 to normally pass through the flow path of the water supply pipe 107. It is determined that the closing has not been completed, and the release determination counter Cva is reset. Then, in the example of FIG. 3D, after that, at time t25, the water level of the elevated water tank 110 reaches less than the open water level and the forced stop of the pump 20 is released, but the water level of the elevated water tank 110 is full again at time t27. It has risen to the water level and the constant water level valve warning is continuing. As described above, in the water supply device 10 of the present embodiment, when the water level of the elevated water tank reaches the full water level (first water level) or higher in the constant water level valve alarm cancellation process, the constant water level valve alarm is continued, so that the constant water level is maintained. It is possible to prevent the detection and cancellation of the valve alarm from being repeated.

The control unit 40 processes S210, S230, and S240 for determining the occurrence and cancellation of an abnormality in the constant water level valve 108, the presence / absence of a constant water level valve alarm, and whether or not to cancel the constant water level valve alarm. It is preferable to store the value of the determination / cancellation determination counter Cva in the non-volatile memory of the storage unit 41. At this time, it is preferable that the history is stored together with the current time when the determination is made. By doing so, when the power supply of the water supply device 10 is cut off and restarted, the state before the power supply can be referred to. In this case, the control unit 40 may make a subsequent determination on the assumption that the determination made before the power is cut off is valid even after the restart. Further, it may be possible to set whether or not to notify the constant water level valve alarm when an abnormality occurs in the constant water level valve 108. When it is selected not to notify the constant water level valve alarm, the history of the constant water level valve alarm is stored in the non-volatile memory of the storage unit 41 and is not notified by the display or the like.

Further, in the above-described embodiment, the constant water level valve alarm is canceled by the localization water level valve alarm release process shown in FIG. 3B. In addition to this, the constant water level valve alarm should be able to be canceled by an external input. That is, in the control unit 40, a constant water level valve alarm is generated by a maintenance person or the like operating the setting unit 45, or by inputting a command signal from an external terminal 80 or the like to the communication unit 48 or the I / O unit 47. In addition, the constant water level valve alarm may be canceled. By doing so, for example, the maintenance person who maintained the constant water level valve 108 can operate the setting unit 45 to cancel the constant water level valve alarm.

In the above embodiment, the forced stop water level is set as the full water level, and the pump 20 is forcibly stopped when the water level of the elevated water tank 110 becomes equal to or higher than the forced stop water level. In addition to this, the control unit 40 may change the forced stop water level to a water level lower than the full water level when it is determined that an abnormality has occurred in the constant water level valve 108. FIG. 4 is a flowchart showing an example of the forced stop water level change process executed by the control unit 40. In this example, the pump control process is performed every time the process ends when the water supply device 10 is automatically operated. Is executed repeatedly.

When the forced stop water level change process is executed, the control unit 40 first determines whether or not the constant water level valve alarm is continued based on the abnormality determination flag Fva (S310). This determination may be made by referring to the abnormality determination flag Fva set to 1 or 0 in S206 of FIG. 3A or S294 of FIG. 3B. When the forced stop water level change process is executed for the first time or when the abnormality determination flag Fva is a value 0, the abnormality determination flag Fva is a value 0, and in S390, the water level of the full water counter and the elevated water tank 110 is less than the open water level. The open water level flag Fs, in which the value 1 is set when the value reaches, is set to the value 0, and the forced stop water level is set to the full water level in S400. Next, consider when the constant water level valve alarm is started (execution of S310 for the first time after S206 in FIG. 3A). The control unit 40 checks the current value of the open water level flag Fs (S320). Now, we are thinking about the time when the constant water level valve alarm is started, and since it is just after the first water level or higher is determined in S202 of FIG. 3A, the water level of the elevated water tank 110 has not reached below the open water level. It is determined that the open water level flag Fs has a value of 0 (S320: Yes). When the open water level flag Fs has a value of 0, the control unit 40 waits for water to be used in the building and the water level of the elevated water tank 110 reaches below the open water level (S330), and sets the open water level flag Fs to a value of 1. Is set (S340). Next, the control unit 40 determines whether or not the water level of the elevated water tank 110 is equal to or higher than the first water level (S350). Now, considering the time when the water level of the elevated water tank 110 reaches less than the open water level, it is determined that the water level of the elevated water tank 110 is lower than the first water level (full water level) (S350: No). At this time, the control unit 40 executes from the first process (S310) again.

When the constant water level valve alarm is continued in the next S310 in which No is determined in S350 (S310: Yes), the control unit 40 checks the value of the open water level flag Fs (S320). Now, when the water level of the elevated water tank 110 reaches less than the open water level once, the value 1 is set in the open water level flag Fs, and it is determined that the open water level flag Fs is not a value 0 (S320: No). At this time, the control unit 40 determines whether or not the water level of the elevated water tank 110 is equal to or higher than the first water level (S350).

Now, consider the case where the water level of the elevated water tank 110 reaches the first water level or higher before the constant water level valve alarm is canceled (S310: Yes). At this time, the control unit 40 executes a process of incrementing the change counter Cf by the value 1 and resets the open water level flag Fs to the value 0 (S360), and compares the change counter Cf with the predetermined threshold value Clef2 (S370). .. Here, the change counter Cf is reset to a value 0 in S390 when the forced stop water level change process is executed for the first time, or when there is no abnormality in the constant water level valve 108, and an abnormality is occurring in the constant water level valve 108. It indicates the number of times that the water level of the elevated water tank 110 reaches the first water level from the open water level or lower. Further, the threshold value Cref2 is a threshold value for determining that an abnormality has occurred in the constant water level valve 108 when the change counter Cf reaches this value, and is predetermined, for example, a value 1, a value 2, a value 3, and the like. The value may be used. When the change counter Cf is less than the threshold value Cref (S370: No), the control unit 40 determines that it cannot be determined that the abnormality of the constant water level valve 108 has been released, and returns to the process of S310.

Then, 0 is set in the abnormality determination flag in the constant water level valve alarm release process of FIG. 3B while the processes of S310 to S360 are repeatedly executed without the change counter Cf reaching the threshold value Cref2 or more (S370: No). Then, it is determined in S310 that the constant water level valve alarm is not continued (S310: No). Then, in this case, the control unit 40 sets the change counter Cf and the open water level flag Fs to a value of 0 to reset (S390), sets the full water level to the forced stop water level (S400), and forcibly stops. The water level change process is completed. In this case, thereafter, as described in the above-described embodiment, the control unit 40 forcibly stops the pump 20 when the water level of the elevated water tank 110 reaches the full water level (forced stop water level) or higher. Let me.

On the other hand, if the water level of the elevated water tank 110 reaches the first water level or higher over the number of times of the threshold value Cref2 before the abnormality determination flag is set to 0 in the constant water level valve alarm cancellation process of FIG. 3B, the change counter Cf becomes the threshold value Cref2 or higher. (S370: Yes in FIG. 4). As an example, when the threshold value Cref2 is a value of 1, the water level of the elevated water tank 110 becomes lower than the open water level while the abnormality of the constant water level valve 108 continues, and then becomes the first water level or higher even once. A positive judgment is made in S370. Then, when the change counter Cf is equal to or higher than the threshold value Cref 2, the closed water level, which is a water level lower than the full water level, is set to the forced stop water level (S380), and the forced stop water level change process is terminated. The control unit 40 may notify the display unit 46 or the like when the forced stop water level is changed. After that, when the water level of the elevated water tank 110 reaches the closed water level (forced stop water level) or higher, the control unit 40 sets S185 in FIG. 2B to Yes and forcibly stops the pump 20 (S189 in FIG. 2B). Let me.

According to such a forced stop water level change process, when the elevated water tank becomes full for the number of times of the threshold Clef due to an abnormality of the constant water level valve 108, the water level below the full water level (here, the closed water level as an example) is forcibly stopped. The water level is set, and then the pump 20 is forcibly stopped when the water level of the elevated water tank 110 reaches the changed forced stop water level or higher. As a result, it is possible to prevent the elevated water tank from being repeatedly filled with water due to an abnormality caused by a malfunction of the constant water level valve 108.

In the example shown in FIG. 4, the control unit 40 sets the closed water level to the forced stop water level in S380. However, the forced stop water level may be changed to a water level higher than the closed water level and lower than the full water level, and a water level different from the closed water level may be set as the forced stop water level.

FIG. 5 is a diagram for explaining the change of the forced stop water level shown in FIG. 4, and is another example of detecting the water level of the elevated water tank 110, the operation / stop of the pump 20, and the constant water level valve alarm. It is a figure shown as a chart. In FIG. 5, at times t21 to t27, the situation is the same as at times t21 to t27 in FIG. 3D, and overlapping description will be omitted. In the example shown in FIG. 5, Cref2 has a value of 2. The constant water level valve alarm that occurred at time t21 has continued since then (S310: Yes), and after the water level in the elevated water tank reached below the open water level at time t22 (S330: Yes), the full water level was reached at time t24. When the level reaches (first water level) or higher (S350: Yes), the control unit 40 increments the change counter Cf to the value 1 (S360). Next, when the water level reaches the first water level or higher at time t27 (S350: Yes), the control unit 40 increments the change counter Cf to the value 2 (S360). Then, when the change counter Cf reaches the threshold value Cref2 at time t27 (S270: Yes), that is, when the water level of the elevated water tank reaches the first water level or higher by the number of times of the threshold value Cref2 (time t27). The control unit 40 changes the forced stop water level to a closed water level, which is a water level lower than the full water level (S380). As a result, after t27, the pump 20 is forcibly stopped every time the water level of the elevated water tank 110 reaches the closed water level or higher (time t29). By such control, it is possible to prevent the elevated water tank 110 from becoming full when the constant water level valve 108 is abnormal.

(Modification 1)
In the above embodiment, the control unit 40 controls the opening and closing of the constant water level valve 108 based on the detection signal from the water level gauge. However, the present invention is not limited to these examples, and the constant water level valve 108 may be opened and closed using the signal of the water level gauge. Specifically, the float type water level sensor 140 is connected to the constant water level valve 108, outputs a signal to open the constant water level valve 108 below the open water level, and outputs a signal to close the constant water level valve 108 above the closed water level. .. Also in this case, by detecting the first water level, it is possible to detect an abnormality in the constant water level valve 108 as in the above-described embodiment. Further, in the present embodiment, since the pump 20 is controlled based on the discharge pressure control and the automatic start / stop control, the control unit 40 does not need to input the signals of the open water level and the closed water level. As a result, the wiring between the elevated water tank 110 and the water supply device 10 may be at least as long as the wiring of the water level gauge is provided, and the wiring between the elevated water tank 110 and the constant water level valve 108 pipe may not be required, which saves labor in wiring. It can be realized.

(Modification 2)
Modification 2 in this embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is a diagram showing an example of a water supply facility 1001 of an elevated water tank system, and FIG. 7 is a diagram showing an example of a water supply facility 1002 of a direct delivery type. In FIGS. 6 and 7, the same reference numerals are given to the same configurations as those of the water supply facility 1000 of FIG. 1, and the description thereof will be omitted. Further, in the functions of FIGS. 6 and 7, the same functions as those of the water supply facility 1000 of FIG. 1 will be omitted.

In the direct water supply facility 1002 shown in FIG. 7, a water supply target (for example, a faucet) 132 is connected to the downstream of the water supply device 10 via a water supply pipe 107. The water supply device 10 of the direct water supply facility 1002 pressurizes the water from the water main 104 or the water receiving tank with the pump 20 to directly supply the water to the water supply target 132 on each floor.

Subsequently, the operation of the pump 20 of the direct delivery type water supply facility 1002 shown in FIG. 7 will be described. When water is used in the water supply target (for example, a faucet) 132 while the pump 20 is stopped, the discharge pressure drops to a predetermined starting pressure P0, and the control unit 40 starts at least one of the pumps 20. (Small stop restart) and discharge pressure control. Then, when the amount of water used by the water supply target (for example, a faucet) 132 decreases during the operation of the pump 20 and the flow switch 24 detects an insufficient amount of water, the control unit 40 stops the pump 20 (stops the small amount of water). .. When water is used again in the building, the discharge pressure drops to a predetermined starting pressure P0, and the pump 20 is restarted at a small stop. The control unit 40 automatically repeats a small amount stop in which the pump 20 is stopped by detecting an insufficient amount of water and a small stop restart in which the pump 20 is restarted when the discharge pressure drops to the starting pressure P0. Start / stop control is performed. As described above, the control program that controls the discharge pressure and the automatic start / stop control can also be used in the direct delivery type water supply equipment 1002, the elevated water tank type water supply equipment 1001 and the water supply equipment 1000.

Here, whether the water supply device 10 is used in the direct delivery type water supply facility 1002 or in the elevated water tank system water supply facility 1001 or the water supply facility 1000 is determined by an external input such as the water supply system switching button 54a. It should be selectable. In the water supply device 10 of the second modification, the storage unit 41 stores a control program compatible with both the elevated water tank system and the direct delivery system, and the arithmetic unit 42 stores the control program corresponding to the selected water supply system. Execute.

In the water supply facility 1001 of the second modification, when the flow of FIG. 2B is carried out, the pump is forcibly stopped at the forced stop water level using the interlock terminal 47a (S189 of FIG. 2). Specifically, instead of or in addition to the float type water level sensor 140, a float type water level sensor 141 for detecting a water level equal to or higher than the forced stop water level is provided. Then, as shown in the water supply facility 1001 of FIG. 6, the float type water level sensor 141 and the interlock terminal 47a are connected. Since the control unit 40 forcibly stops the pump 20 when a signal is input to the interlock terminal 47a, the pump 20 can be forcibly stopped by detecting a water level equal to or higher than the forced stop water level by the float type water level sensor 140. That is, the determination of S185 and / or S190 in the flow of FIG. 2B is performed by the float type water level sensor 141 instead of the control unit 40. Further, the control unit 40 can notify that the elevated water tank 110 is full due to some abnormality by notifying the input signal to the interlock terminal 47a. Here, in this modification, the forced stop water level input to the interlock terminal 47a may be the first water level which is a predetermined water level equal to or higher than the closed water level at which the constant water level valve 108 is closed. In this case, the constant water level valve alarm may be detected by inputting a signal above the forced stop water level to the interlock terminal 47a.

In this way, in the water supply device 10 that can be selected from the direct delivery type water supply facility 1002 to the elevated water tank type water supply facility 1001, the water supply device 10 is a control method when used in the elevated water tank system, and is an inter. By the control method of stopping the water supply to the elevated water tank 110 by inputting the forced stop water level to the lock terminal 47a, water overflows from the elevated water tank 110 while using the discharge pressure control and the automatic start / stop control. Can be prevented.

In the above-described embodiment and modification, when the water level of the elevated water tank 110 reaches the full water level (first water level) or higher based on the detection signal from the water level gauge, the control unit 40 detects the constant water level valve alarm. It was decided to issue a report. However, the control unit 40 is not limited to such an example, and as an example, when the pump 20 is operated for a predetermined time (first hour) or more with the water level of the elevated water tank 110 reaching the closed water level or higher, the control unit 40 , It may be determined that the water level of the elevated water tank 110 has reached the first water level or higher based on the signal from the water level gauge, and the constant water level valve alarm may be detected and issued. As a result, the control unit 40 does not need to input the signal of the first water level, and the wiring between the elevated water tank 110 and the water supply device 10 can be reduced. Further, the control unit 40 inputs a predetermined second water level from the water level gauge, counts the number of times the water level of the elevated water tank 110 has changed from less than the second water level to the second water level or higher, and the number of times is the predetermined number of times. If it exceeds the water level, it may be determined that the water level has reached the first level or higher. For example, assuming that the second water level is the closed water level, the second water level is detected by detecting the closed water level by the electrode rod 124 that detects the closed water level of the electrode type level switch 120 or the float type water level sensor 140, and the elevated water tank 110. The number of times the water level has changed from less than the second water level to the second or higher water level is counted, and when the number of times exceeds a predetermined number, it is determined that the water level has reached the first water level or higher, and a constant water level valve alarm is detected. As a result, for example, even if the water level is erroneously detected due to a wave on the water surface of the elevated water tank, the constant water level valve alarm is not directly detected, so that the determination of the abnormality of the constant water level valve 108 is stable and the constant water level valve alarm. It is possible to prevent erroneous detection of. In this case, the first water level and the second water level may be the same water level.

Similarly, in the control unit 40, when the pump 20 is operated for a predetermined time or longer with the water level of the elevated water tank 110 reaching the closed water level or higher, the water level of the elevated water tank 110 is forced to stop. It may be determined that there is, and the pump 20 may be forcibly stopped. In this way, for example, the constant water level valve 108 is automatically opened and closed according to the water level of the elevated water tank 110, or the water level gauge does not input to the control unit 40 whether or not the water level has reached the full water level or higher. Even if there is, the same control as in the embodiment can be executed. As the predetermined time, for example, a time determined by an experiment or the like may be used as a time obtained by adding a margin to the time until the pump 20 stops when the constant water level valve 108 is normally closed. As a result, the control unit 40 does not need to input the signal of the forced stop water level. The wiring between the elevated water tank 110 and the water supply device 10 can be reduced to save labor in wiring work.

Further, even if the constant water level valve 108 is closed in S160 and the flow path of the water supply pipe 107 is closed, it is conceivable that the insufficient water amount cannot be detected due to an abnormality in the flow switch 24 (S186: No). It is difficult to determine the abnormality of the flow switch 24 based on whether or not the insufficient amount of water is detected because the amount of discharged water may be too small during the operation of the pump 20, but it is discharged while the pump 20 is stopped. Since the amount of water is zero, it can be easily determined that the detected values are inconsistent if the insufficient amount of water is not detected. Therefore, when the operation of the pump 20 (S187) is continued for a predetermined forced stop time or longer in a state where the insufficient water amount cannot be detected due to an abnormality of the flow switch 24 (S186: No), the water level of the elevated water tank 110 is forced to stop. It should be judged that the above has been reached. Then, even if the pump 20 is stopped, the underflow rate is not detected, so that the control unit 40 can detect the abnormality of the flow switch 24. Further, the control unit 40 may store in the storage unit 41 the fact that the water level has reached the forced stop water level (full water level) or higher and the abnormality of the flow switch 24 as a history. By confirming that the flow switch 24 has an abnormality after the water level reaches the forced stop water level or higher in the history, the maintenance staff can confirm that the water level of the elevated water tank 110 has dropped and the constant water level valve alarm has been canceled. It is possible to identify whether or not the cause of the determination that the water level has risen to the forced stop water level is an abnormality of the flow switch 24. As the symbol or the like indicating that the water level has reached the forced stop water level or higher in the history, the same symbol as the symbol indicating the full water level or higher or the constant water level valve alarm may be used. Further, in the history, the time when the water level reaches the forced stop water level or higher, the time when the water level reaches below the forced stop water level, the time when the abnormality of the flow switch 24 occurs, and the recovery time are also stored together with the water level of the elevated water tank 110. It is good. The above-mentioned forced stop time is calculated by the control unit 40 based on the operation status of the pump 20 stored in the history information (for example, the operation continuation time and frequency of the past pump 20 and the operation time and frequency at the same time in the past). Alternatively, it may be set in the control unit 40 by an external input as changeable setting value information. Further, the determination that the water level of the elevated water tank 110 has reached the forced stop water level or higher may be determined when the operation of the pump 20 is continued for a predetermined time or longer with the water level of the elevated water tank 110 reaching the closed water level or higher. , The forced stop water level or higher may be detected by the water level gauge installed in the elevated water tank 110. In this way, when it is determined that the water level of the elevated water tank 110 has reached the forced stop water level or higher and the flow switch 24 does not detect that the amount of water is too small after the pump 20 is stopped, it is determined that the flow switch 24 is abnormal. By doing so, it is possible to identify the cause of the water level of the elevated water tank 110 rising to the forced stop water level.

Although the embodiments of the present invention have been described above, the embodiments of the invention described above are for facilitating the understanding of the present invention and do not limit the present invention. The present invention can be modified and improved without departing from the spirit thereof, and it goes without saying that the present invention includes an equivalent thereof. In addition, any combination or omission of the claims and the components described in the specification is possible within the range in which at least a part of the above-mentioned problems can be solved, or in the range in which at least a part of the effect is exhibited. Is.

10 ... Water supply device 20 ... Pump 21 ... Motor 22 ... Inverter 23 ... Check valve 24 ... Flow switch 26 ... Pressure sensor (pressure gauge)
28 ... Pressure tank 40 ... Control unit 41 ... Storage unit 42 ... Calculation unit 44 ... Operation panel 45 ... Setting unit 45a ... Water supply method switching button 46 ... Display unit 47 ... I / O unit 48 ... Communication unit 80 ... External terminal 108 ... Constant water level Constant water level valve 110 ... High water tank 120 ... Electrode type level switch (water level gauge)
121-125 ... Electrode rod 140 ... Float type water level sensor (water level gauge)
1000 ... Water supply equipment 1001 ... Water supply equipment 1002 ... Water supply equipment

Claims (10)

A water supply device that is connected to an elevated water tank installed higher than the water supply target via a constant water level valve and supplies water to the water supply target via the elevated water tank.
A pump that transfers water to the elevated water tank,
A pressure gauge that measures the discharge pressure of the pump and
A control unit that controls the pump based on the discharge pressure of the pump measured by the pressure gauge.
Equipped with
Based on the signal from the water level gauge that detects the water level of the elevated water tank, the control unit has a first water level at which the water level of the elevated water tank is a predetermined water level equal to or higher than the closed water level at which the constant water level valve is closed. Detects a constant water level valve alarm when it is determined that the above has been reached,
Water supply device. The control unit determines the constant water level valve when the pump is started at least twice without the water level of the elevated water tank reaching the first water level or higher when the constant water level valve alarm is detected. Cancel the alarm,
The water supply device according to claim 1. The control unit counts the number of times that the water level of the elevated water tank becomes the second water level or higher from less than the predetermined second water level above the closed water level, and when the number of times becomes the predetermined number of times or more, the first water level. Judging that the above has been reached,
The water supply device according to claim 1 or 2. When the control unit determines that the water level of the elevated water tank has reached the forced stop water level, which is a predetermined water level equal to or higher than the closed water level, the control unit forcibly stops the pump.
The water supply device according to any one of claims 1 to 3. The control unit counts the number of times that the water level of the elevated water tank changes from less than the forced stop water level to the forced stop water level or higher when the constant water level valve alarm is detected, and the number of times becomes the predetermined number or more. When it is determined, the forced stop water level is changed to a water level lower than the full water level at which the elevated water tank is full.
The water supply device according to claim 4. The control unit stores the detection of the constant water level valve alarm and the information regarding the water level of the elevated water tank during the constant water level valve alarm in the non-volatile memory.
The water supply device according to any one of claims 1 to 5. The control unit cancels the constant water level valve alarm when a predetermined external input is made.
The water supply device according to any one of claims 1 to 6. With a pump,
A control device that controls the pump and
It is a control method of a water supply device equipped with
The water supply device is used as a water supply system.
An elevated water tank system in which an elevated water tank installed higher than the water supply target is connected to the discharge side of the water supply device, and
A direct delivery type in which the water supply target is connected to the discharge side of the water supply device, and
Can be selected,
When the direct delivery type is selected, the control device controls the pump so that the discharge pressure of the pump starts at a predetermined starting pressure or less and the discharge flow rate of the pump stops at an insufficient amount of water. Performs automatic start / stop control,
When the elevated water tank system is selected, the control device performs the automatic start / stop control by opening / closing the constant water level valve provided in the water supply pipe forming the discharge pipe of the pump. Based on the signal from the water level gauge that detects the water level of the elevated water tank, the water level of the elevated water tank reaches the forced stop water level or higher, which is a predetermined water level equal to or higher than the closed water level at which the constant water level valve is closed. When it is determined that the pump is forcibly stopped ,
How to control the water supply system. With a pump,
A control device that controls the pump and
It is a control method of a water supply device equipped with
The water supply device is used as a water supply system.
An elevated water tank system in which an elevated water tank installed higher than the water supply target is connected to the discharge side of the water supply device, and
A direct delivery type in which the water supply target is connected to the discharge side of the water supply device, and
Can be selected,
When the direct delivery type is selected, the control device controls the pump so that the discharge pressure of the pump starts at a predetermined starting pressure or less and the discharge flow rate of the pump stops at an insufficient amount of water. Performs automatic start / stop control,
When the elevated water tank system is selected, the control device performs the automatic start / stop control by opening / closing the constant water level valve provided in the water supply pipe forming the discharge pipe of the pump. When the water level of the elevated water tank reaches the forced stop water level or higher, the pump stops and the pump stops.
The water supply device includes a flow rate detector that detects a state of an insufficient amount of water in which the discharge amount of the pump drops to a predetermined flow rate or less.
When the elevated water tank method is selected, after it is determined that the water level of the elevated water tank has reached the forced stop water level or higher and the pump is stopped, the flow rate detector determines the state of the insufficient water amount. If it is not detected, it is determined that the flow rate detector is abnormal.
How to control the water supply system. The control device stores in the storage unit that the water level of the elevated water tank has reached the forced stop water level or higher and that the flow rate detector has determined to be abnormal.
The control method for a water supply device according to claim 9.

Images