JP2020159244A - Water supply device - Google Patents

Abstract

To provide a water supply device capable of continuing the supply of water even when abnormality occurs in a water level gage.SOLUTION: The water supply device having a pump is provided for supplying transportation liquid to a water supply destination. The water supply device includes a control part for performing water tank control on the basis of a water level signal from the water level gauge provided in a water tank storing the transportation liquid. The control part detects the water level state of the water tank on the basis of predetermined detection conditions, and when determining that the detected water level state is a predetermined abnormal water level state, changes the detection conditions from first detection conditions to second detection conditions.SELECTED DRAWING: Figure 9

Description

The present invention relates to a water supply device.

Water supply devices are widely used to supply tap water to water supply targets such as buildings. As the water supply method of the water supply device, there are a water receiving tank method that pressurizes the water in the water receiving tank in which the water of the water main is stored with a pump to the water supply target, and an increase with a pump using the main pressure of the water main. A direct water supply system that supplies water to a water supply target by pressing is known.

There are two types of water receiving tanks: a water receiving tank one tank type consisting of one water receiving tank and a water receiving tank two tank type consisting of two water receiving tanks communicating with each other by a communication pipe provided with a sluice valve. .. In the case of the two-tank type, the sluice valve is normally opened so that the two receiving tanks communicate with each other, and the water stored in the two receiving tanks is supplied to the water supply target by the pump of the water supply device. Then, by closing the sluice valve, it is possible to clean the other water tank while continuing to supply water to the water supply target using one water tank. At this time, the user selects a water receiving tank to be used for water supply through an operation panel or the like. (Patent Document 1)

In addition, there is an elevated water tank system in which water is sent to an elevated water tank installed on the roof of a building by a pump of a water supply device, and the water is supplied from the elevated water tank to a water supply target. In the elevated water tank system, a water supply device of a direct water supply system is mainly used, and the pump starts when the water level of the elevated water tank is below the predetermined start water level and stops when the water level reaches the predetermined stop water level above the start water level. (Patent Document 3)

Patent No. 3798479 JP 2006-161791 Japanese Patent No. 400573

If the pump is operated when there is no water in the water receiving tank, the pump will break. Therefore, if a drought is detected in the water receiving tank due to an abnormality in the water level gauge, the pump of the water supply device will be forcibly stopped and the water will be cut off. (Patent Document 2) However, water supply to the water supply target is a lifeline, and water outage must be avoided as much as possible.

Further, in the elevated water tank system, if the water level at which the pump is started cannot be detected due to an abnormality in the water level gauge, the water in the elevated water tank is exhausted and the water is cut off. Further, if the stop water level of the pump cannot be detected after the pump is started, the water in the water tank overflows and causes secondary damage to the dwelling downstairs.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a water supply device capable of continuing water supply even when an abnormality occurs in a water level gauge.

According to one embodiment, a water supply device having a pump and for supplying a transport liquid to a water supply destination is proposed. The water supply device includes a control unit that controls the water tank based on a water level signal from a water level gauge provided in the water tank that stores the conveyed liquid, and the control unit controls the water level of the water tank based on a predetermined detection condition. When a state is detected and it is determined that the detected water level state is a predetermined abnormal water level state, the detection condition is changed from the first detection condition to the second detection condition. According to such a water supply device, when it is determined that the water level is abnormal by using the water level gauge under the first detection condition, the detection condition is changed from the first detection condition to the second detection condition. By changing the detection condition of the water level gauge in this way, it is possible to suppress the abnormal stop of the pump and continue the water supply.

It is a figure which shows an example of the water supply equipment which concerns on 1st Embodiment of this invention. It is a figure which shows an example of the operation panel which concerns on this embodiment. It is a flowchart which shows an example of the water level determination process of a water receiving tank executed by a control part. It is a flowchart which shows an example of the sensor change determination process executed by a control part. It is a figure which shows another example of a water supply facility. It is a figure which shows an example of the water supply equipment which concerns on the modification. It is a flowchart which shows the water level gauge determination process in the control part of the water supply device of the modification. It is a flowchart which shows an example of the sensor change determination process executed by the control part of the modification example. It is a figure which shows an example of the water supply equipment which concerns on 2nd Embodiment. It is a flowchart which shows the switching from the 1st detection condition to the 2nd detection condition of the detection condition of the water level state in a water receiving tank. It is a figure which shows another example of the electrode type level switch as a water level gauge in a water supply facility, (A) shows the water level level in a 1st detection condition, (B) shows a water level level in a 2nd detection condition. .. It is a figure which shows another example of the electrode type level switch as a water level gauge in a water supply facility, (A) shows the water level level in a 1st detection condition, (B) shows a water level level in a 2nd detection condition. .. It is a figure which shows another example of the electrode type level switch as a water level gauge in a water supply facility, (A) shows the water level level in a 1st detection condition, (B) shows a water level level in a 2nd detection condition. .. It is a figure which shows another example of the electrode type level switch as a water level gauge in a water supply facility, (A) shows the water level level in a 1st detection condition, (B) shows a water level level in a 2nd detection condition. .. It is a figure which shows an example of the water supply equipment which concerns on 3rd Embodiment. It is a figure which shows an example of the water level gauge used in the elevated water tank system, and shows the water level level under the 1st detection condition. It is a figure which shows an example of the water level gauge used in the elevated water tank system, and shows the water level level under the 2nd detection condition. It is a figure which shows an example of the water level gauge used in the elevated water tank system, and shows the water level level under the 2nd detection condition. It is a figure which shows an example of the water level gauge used in the elevated water tank system, and shows the water level level under the 2nd detection condition. It is a figure which shows an example of the water level gauge used in the elevated water tank system, and shows the water level level under the 2nd detection condition. It is a figure which shows an example of the water level gauge used in the elevated water tank system, and shows the water level level under the 2nd detection condition. It is a figure which shows the modification of the water supply facility which concerns on 3rd Embodiment. It is a figure which shows another modification of the water supply facility which concerns on 3rd Embodiment.

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.

(First Embodiment)
FIG. 1A is a diagram showing a water supply facility according to the first embodiment of the present invention. This water supply facility includes a water supply device 10, a water receiving tank 110A (first water receiving tank), and a water receiving tank 110B (second water receiving tank), and is mainly a building such as an apartment, an office building, a commercial facility, or a school. It is a facility for supplying water (conveyed liquid) to (water supply target). As shown in FIG. 1A, in the present embodiment, the water supply device 10 is used in a water receiving tank system (two water receiving tanks) in which two water receiving tanks 110A and 110B are installed on the suction side (upstream side). .. A water supply pipe 107 is connected to the discharge port of the water supply device 10, and the water supply pipe 107 communicates with a water faucet (for example, a faucet) of each building (not shown). The water supply device 10 pressurizes the water stored in the water receiving tanks 110A and 110B from a water main which is a water supply source (not shown), and supplies water to each water tap of the building. The water receiving tank used by the water supply device 10 for water supply can be selected from either the water receiving tank 110A, the water receiving tank 110B, or the shared water receiving tank 110A and the water receiving tank 110B (shared water receiving tank). is there.

The water supply device 10 has a first water receiving tank mode in which water is supplied using the water receiving tank 110A, a second water receiving tank mode in which water is supplied using the water receiving tank 110B, and a water receiving tank in a state where the sluice valve 118B described later is released. The water receiving tank common mode in which water is supplied by using both the water receiving tank 110A and the water receiving tank 110B is provided. In the present embodiment, the first water receiving tank mode is selected when the water receiving tank 110A is selected in the water receiving tank selection, the second water receiving tank mode is selected when the water receiving tank 110B is selected, and the water receiving tank is shared when shared is selected. Set to mode.

First, a two-tank water receiving tank type will be described. In the two-tank type of water receiving tank, two water receiving tanks 110A and 110B are used. The two water receiving tanks 110A and 110B are provided with water supply pipes 130A (first inflow pipe) and 130B (second inflow pipe) branched from the introduction pipe 102 communicating with the water main. Water from a pipe (not shown) is stored. City water inflow valves 132A (first city water inflow valve) and 132B (second city water inflow valve) are provided in the inflow pipes 130A and 130B, respectively. The city water inflow valves 132A and 132B are valves that can shield the flow paths of the inflow pipes 130A and 130B. For example, they are composed of solenoid valves and are controlled by an output signal from the I / O unit 47 of the water supply device 10. Will be done. The water receiving tank 110A is installed downstream of the inflow pipe 130A provided with the city water inflow valve 132A, and when the city water inflow valves 132A and 132B are opened, the water of the introduction pipe 102 flows into the water receiving tank 110A. The water receiving tank 110B is installed downstream of the inflow pipe 130B provided with the city water inflow valve 132B, and when the city water inflow valve 132B is opened, the water of the introduction pipe 102 flows into the water receiving tank 110B. To do.

The water receiving tanks 110A and 110B and the suction port of the water supply device 10 are connected by introduction pipes 116A and 116B. The introduction pipes 116A and 116B are provided with sluice valves 118A and 118B that can be opened and closed manually, respectively. When the sluice valve 118A is opened, the water receiving tank 110A and the water supply device 10 communicate with each other, and when the sluice valve 118B is opened, the water receiving tank 110B and the water supply device 10 communicate with each other, and one or both of the water receiving tanks 110A and 110B. The water stored in the water supply device 10 is introduced into the water supply device 10.

Further, the water receiving tanks 110A and 110B are connected to each other by a communication pipe 112 provided with a water stop valve 114. The water stop valve 114 is composed of, for example, a sluice valve, and the water levels of the water receiving tanks 110A and 110B are the same when the water stop valve 114 is open, the water levels of the water receiving tanks 110A and 110B are the same, and the water stop valve 114 is closed. When they are, the water levels are independent of each other.

Each of the water receiving tanks 110A and 110B is provided with a first water level gauge which is a water level gauge for detecting the water level in the water receiving tank 110A and a second water level gauge which is a water level gauge for detecting the water level in the water receiving tank 110B. .. Specifically, an electrode type level switch 120A (first water level gauge) and an electrode type level switch 120B (second water level gauge), which are water level gauges for detecting the water level in the water receiving tanks 110A and 110B, are provided. As for the water level in the water receiving tanks 110A and 110B, the water level below the predetermined water level at which the pump 20 is forcibly stopped is a drought state, and the water level above the predetermined water level at which water may overflow is a full water level. The I / O unit 47 of the water supply device 10 inputs the detection signals by the electrode type level switches 120A and 120B. Each of the electrode type level switches 120A and 120B includes a plurality of electrode rods 121 to 125 arranged in the water receiving tanks 110A and 110B. The plurality of electrode rods 121 to 125 are water level detectors, and open the common electrode rod 121, the electrode rod 122 for detecting drought, and the city water inflow valves 132A and 132B in the order in which the low water level can be detected. The electrode rod 123 for detecting the open water level, the electrode rod 124 for detecting the closed water level that closes the city water inflow valves 132A and 132B, and the electrode rod 125 for detecting full water. The electrode type level switches 120A and 120B are not limited to those having five electrode rods 121 to 125, and may have three, four, or six or more electrode rods. Even in that case, it is preferable to detect the drought with the electrode rod capable of detecting the lowest water level and to detect the full water with the electrode rod capable of detecting the highest water level. Further, the water level for opening the city water inflow valves 132A and 132B may be lower than the water level for closing the city water inflow valves 132A and 132B.

Here, in the electrode type level switch 120A (first water level gauge) and the electrode type level switch 120B (second water level gauge), the change in the resistance value between each electrode rod 121 to 125 and the longest common electrode rod 121 By detecting, it is detected that the water level is higher than the lower end of each of the electrode rods 122 to 125. That is, the water levels of the electrode type level switch 120A (first water level gauge) and the electrode type level switch 120B (second water level gauge) are higher than the lower ends of the electrode rods 122 to 125, and the electrode rods 122 to 125 and the common electrode rods are common. When the space between 121 is conducted by water, the detection signal of each water level is output to the I / O unit 47 described later.

Each of the water receiving tanks 110A and 110B is provided with float switches 140A and 140B which are water level gauges for detecting the water level in the water receiving tanks 110A and 110B in place of or in addition to the electrode type level switches 120A and 120B. May be good. The detection signals by the float switches 140A and 140B are transmitted to the control unit 40 of the water supply device 10. A plurality of float switches 140A and 140B may be provided to detect the drought water level, the open water level of the city water inflow valves 132A and 132B, the closed water level of the city water inflow valve, and the full water level.

The city water inflow valves 132A and 132B may be opened and closed without going through the control unit 40. Specifically, the water level gauge described above is provided with an output unit such as a relay contact connected to the city water inflow valves 132A and 132B, and the opening and closing of the city water inflow valves 132A and 132B is controlled by a signal from the output unit. Each water level gauge turns on the signal to open the corresponding city water inflow valve 132A, 132B by detecting the opening level or less of the city water inflow valves 132A, 132B, and corresponds to the detection of the water closing level or more of the city water inflow valve. The signal for opening the city water inflow valve may be turned off.

Next, the water supply device 10 of this embodiment will be described. 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 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.

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 other pumps 20 that can be operated to avoid water outage as much as possible.

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 is a flow rate detector that detects that the flow rate of water flowing through the discharge pipe 32 has dropped to a predetermined value, that is, an insufficient amount of water (small amount of water). 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 measuring device for measuring the discharge pressure of the pump 20 (hereinafter, the discharge pressure indicates a pressure value measured by the pressure sensor 26). 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. 1A, 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, a ROM, an HDD, an EEPROM, a FeRAM, a non-volatile memory such as a flash memory, and a volatile memory such as a RAM are 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. When the storage unit 41 has a non-volatile storage area, these may be stored in the non-volatile storage area.

In this embodiment, as the device information or the set value information whose setting can be changed, whether the water receiving tank is a one-tank type or a two-tank type, the water receiving tank selection, the number of electrode rods in the electrode type level switches 120A and 120B, Further, the water level signal input to each electrode and the currently selected water receiving tank 110A and / or 110B are stored.

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. Do. In addition, the calculation unit 42 controls communication in the communication unit 48, the I / O unit 47, and the like, and controls display and operation on the operation panel 44. The calculation result in the calculation unit 42 is stored in the storage unit 41 and output to the I / O unit 47 and the communication unit 48.

A port or the like is used as the I / O unit 47. The I / O unit 47 receives detection signals of various sensors such as the pressure sensor 26, the flow switch 24, the electrode type level switches 120A and 120B provided in the water receiving tanks 110A and 110B, and the float switches 140A and 140B. Is sent to the calculation unit 42. Further, the I / O unit 47 sends a command signal from the calculation unit 42 to the city water inflow valves 132A and 132B provided in the introduction pipes 102 to the water receiving tanks 110A and 110B. Further, the I / O unit 47 is connected to each other with the inverter 22. The I / O unit 47 and the inverter 22 may be connected to each other by communication means such as RS422, 232C, 485.

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 separate substrates. In this case, the control unit 40 and the operation panel 44 may be connected by serial communication, by wire such as a signal line, or wirelessly. When the control unit 40 and the operation panel 44 are used as separate substrates, 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 operates / stops the automatic water supply in the water supply device 10 by an external operation of the user, selects the water receiving tanks 110A and 110B, resets the alarm, and various types. It is used to perform various input operations such as changing data settings. 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 external inputs. The information input by the external operation through the setting unit 45 is stored in the storage unit 41. For example, the setting unit 45 can change the setting of the water supply system, the set pressure PA, the minimum pressure PB, the starting pressure P0, and the stopping pressure P1 of the water supply device 10 as set value information.

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. 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 the operation of the water supply device 10 can be displayed on the display unit 46. it 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.

FIG. 1B is a diagram showing an example of the operation panel 44 of the present embodiment. As shown in the figure, the operation panel 44 of the present embodiment may have a water tank selection button 441 as an operation button and a plurality of LEDs (L1 to L4). The water tank selection button 441 is, for example, a tact switch, and when the operator presses it, either "No. 1", "No. 2", or "shared" can be selected as the water tank selection. If the water receiving tank selection is "No. 1", the water supply device 10 supplies water using the water receiving tank 110A, and if the water receiving tank selection is "No. 2", water is supplied using the water receiving tank 110B. If the water receiving tank selection is "shared", water is supplied using both the water receiving tank 110A and the water receiving tank 110B. The state of water tank selection by the water tank selection button 441 is indicated by lighting one or both of L3 and L4. That is, when "No. 1" is selected, only L3 is lit, when "No. 2" is selected, only L4 is lit, and when "shared" is selected, both L3 and L4 are lit. Lights up. Further, the water level alarm may be indicated by lighting or blinking of L1 or L2. Specifically, when the water level of the water receiving tank selected as the water receiving tank selection is full, L1 lights up as a full water alarm. Further, L2 blinks as a water reduction warning when the selected water level in the receiving tank is in a low water state, and L2 lights up as a drought warning when the selected water level in the receiving tank is in a drought state. The water tank selection may be changed by an external input to the communication unit 48 or the I / O unit 47 in place of or in addition to the one changed by the water tank selection button 441.

When the user of the water supply device 10 selects "shared" in the water receiving tank selection and opens the water stop valve 114 of the communication pipe 112, the water supply device 10 conveys the water stored in the water receiving tanks 110A and 110B. At this time, it is preferable that both the sluice valves 118A and 118B can be opened, but only one of them may be opened. When the user of the water supply device 10 selects "No. 1" or "No. 2" in the water receiving tank selection and closes the water stop valve 114 of the communication pipe 112, the water receiving tanks 110A and 110B open independent water receiving tanks. Constitute. The user of the water supply device 10 selects "No. 1" in the water receiving tank selection, closes the water stop valve 114, opens the sluice valve 118A, and closes the sluice valve 118B, so that the water receiving tank 110A is used. While continuing the water supply by the water supply device 10, maintenance such as draining and cleaning the water receiving tank 110B can be performed. Further, by selecting "No. 2" in the water receiving tank selection, opening the sluice valve 118B with the water stop valve 114 closed, and closing the sluice valve 118A, the water supply device 10 uses the water receiving tank 110B. Maintenance such as cleaning of the water receiving tank 110A can be performed while continuing the water supply.

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 type 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 USB (Universal Serial Bus), and communication may be performed by connecting the external terminal 80 to the control unit 40, or RS422,232C. , 485 and the like may be used for serial communication.

The external terminal 80 has a display operation unit 80A, and is configured to be able to display and change various data related to the water supply device 10 by communicating with the communication unit 48 of the water supply device 10. 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 employ 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, the 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 performed by the external terminal 80. In this way, 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), operations such as checking the state of the water supply device 10 and changing the set value information become easy. ..

Next, an example of water supply control of the water supply device 10 by the control unit 40 will be described. The discharge pressure is the predetermined starting pressure P when the drought state has not occurred and the pump 20 is stopped.
When it drops to zero, the control unit 40 starts at least one of the pumps 20. Specifically, the control unit 40 issues a command to the motor 21 (inverter if the inverter is provided) to start driving the pump 20. During the operation of the pump 20, control such as estimated terminal pressure constant control or target pressure constant control is performed by the set pressure (set pressure PA). Specifically, in the case of constant estimated terminal 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 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 water 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 use of water in the building is reduced during the operation of the pump 20, the flow switch 24 detects that the discharge flow rate from the pump 20 has reached less than the underwater amount Qmin, and the detection signal is transmitted via the I / O unit 47. Is sent to the control unit 40. Upon receiving this detection signal, the control unit 40 performs an accumulator operation that controls the rotation speed of the pump 20 so that the discharge pressure reaches the stop pressure P1 at a predetermined time. 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). After the small amount of water is stopped by the pump 20, when water is used again in the building and the discharge pressure drops to the starting pressure P0 or less, the small stop restart of the pump 20 is performed. 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 a method for detecting a small amount of water, other means such as a low load based on the current value of the motor 21 and a deadline lift may be used without using the flow switch 24.

In the present embodiment, the signals of the electrode type level switches 120A and 120B are input to the control unit 40, but the control unit 40 has the two input signals of the electrode type level switch 120A and the electrode type level switch 120B. , The water level of the water receiving tanks 110A and 110B is determined based on the signal of only one of them, and the water receiving tank control is executed based on the determined water level. Water receiving tank control includes opening / closing control of city water inflow valves 132A and 132B, forced stop of pump 20 due to drought condition, display of water level warning on operation panel 44 and external terminal 80, and city water inflow valves 132A and 132B. It includes at least one such as an open / close signal and an external output such as a water level alarm. FIG. 2 is a flowchart showing an example of the water level determination process of the water receiving tanks 110A and 110B executed by the control unit 40. This water level determination process is repeatedly executed every predetermined time (for example, every few seconds or every few minutes) when the water supply device 10 is activated.

When the water level determination process is executed, the control unit 40 first determines the currently selected water receiving tank (water receiving tank selection) (S110). Here, the water receiving tank selected by the external input is stored in the predetermined area of the storage unit 41, and the determination of S110 may be performed by referring to the predetermined area of the storage unit 41.

When the water receiving tank selection is "No. 1" or "No. 2" (S110: 1st or 2nd water receiving tank), the control unit 40 sets the water level gauge of the selected water receiving tank as the control sensor (S110: 1st or 2nd water receiving tank). S120). That is, when "No. 1" is selected in the water receiving tank selection, the control unit 40 sets the first water level gauge (electrode type level switch 120A and / or float switch 140A) as the control sensor, and " When "No. 2" is selected, the second water level gauge (electrode type level switch 120B and / or float switch 140B) is set as the control sensor. Water tank control is executed using the water level detected by the control sensor. When the control sensor is set, the control unit 40 stores the control sensor set in the storage unit 41. Further, the control unit 40 may display the control sensor stored in the storage unit 41 on the display unit 46 in response to an operation of the setting unit 45 by the operator or the like. Further, the control unit 40 may notify the external terminal 80 of the control sensor currently set in response to the request signal or the like from the external terminal 80 by communication.

Then, the control unit 40 determines the water level of the water receiving tank using the set detection value of the control sensor (S160), and ends the water level determination process. At present, "No. 1" or "No. 2" is selected as the water receiving tank selection, and at this time, the water stop valve 114 is closed and the water receiving tank 110A and the water receiving tank 110B are independent. Therefore, the control unit 40 may determine the water level of the water receiving tank 110A or the water receiving tank 110B by using the electrode type level switches 120A, 120B or the float switches 140A, 140B of the water receiving tanks 110A and 110B used.

On the other hand, when the water receiving tank selection is "shared" (S110: shared), the control unit 40 continuously determines whether or not there is an abnormality in the first water level gauge (S130).

Here, as an example of the abnormality detection conditions of the first water level gauge and the second water level gauge, it is the water level at which the city water inflow valve 132A is detected and at the same time the city water inflow valve 132A is closed. If there is a contradiction in the water level detected by the electrode type level switch 120A, such as when it is detected, or when a water level state above the drought water level such as a drought state and a full water state is detected at the same time, the first If it is determined that the water level gauge is abnormal and the water level detected by the electrode type level switch 120B is inconsistent with the second water level gauge, the second water level gauge is also abnormal. It is determined that there is.

In addition, as another example of the condition for detecting an abnormality in the first water level gauge and the second water level gauge, the first water level gauge and the second water level gauge are used with "shared" selected in the water receiving tank selection. If there is a contradiction in the detected water level, it is regarded as an abnormality of the first water level gauge and the second water level gauge. Specifically, the control unit 40 receives water up to the electrode rod 123 for detecting the open water level when at least one of the city water inflow valves 132A and 132B is open as a condition for detecting an abnormality in the first water level gauge. Pump 20 when the rise in water level is not detected by the first water level gauge, such as when the water does not reach or the water does not reach the electrode rod 124 for detecting the closed water level, or when the city water inflow valves 132A and 132B are both closed. If the water level below the closed water level cannot be detected by the first water level gauge or the water level does not fall below the open water level even though the water level has been operated, it is advisable to detect an abnormality in the first water level gauge. .. Further, as a condition for detecting an abnormality in the second water level gauge, the control unit 40 determines that when at least one of the city water inflow valves 132A and 132B is open, the second water level gauge does not detect an increase in the water level, and When the pump 20 is operated when both the city water inflow valves 132A and 132B are closed, but the water level drop is not detected by the second water level gauge, and an abnormality of the second water level gauge is detected. Good. In these cases, at least one of the city water inflow valves 132A and 132B is opened, water flows into the water receiving tanks 110A and 110B from the water main, and the water levels of both the water receiving tanks 110A and 110B rise at almost the same timing. Based on. Further, when the pump 20 is operated and water is transferred to the water supply device 10 with the city water inflow valves 132A and 132B closed, the water levels of both the water receiving tanks 110A and 110B are lowered at almost the same timing. Based on. False detection can be prevented by detecting an abnormality by comparing the values of the first water level gauge and the second water level gauge.

Then, when the control unit 40 determines that there is no abnormality in the first water level gauge (S130: Yes), the control unit 40 sets the first water level gauge in the control sensor (S140). On the other hand, when the control unit 40 determines that the first water level gauge has an abnormality (S130: No), the control unit 40 sets the second water level gauge as the control sensor instead of the first water level gauge (S150). Then, after setting the control sensor, the control unit 40 determines the water level signal from the signals of the electrode rods 121 to 125 of the set control sensor (S160), and ends the water level determination process.

Now, "shared" is selected in the water receiving tank selection. At this time, the water stop valve 114 is opened and the water receiving tanks 110A and 110B are connected to each other, so that the first water level gauge and the second water level gauge are detected. The water levels of the target water receiving tank 110A and the water receiving tank 110B are equal. However, for example, when the electrode type level switches 120A and 120B are used, the lengths of the electrode rods 121 to 125 are adjusted and installed at the installation site of the water receiving tanks 110A and 110B, or the water surface is wavy. Even if the water stop valve 114 is open, the signals detected by the electrode type level switches 120A and 120B may not be the same. Since an error between the detected values of the first water level gauge and the second water level gauge occurs in this way, in the present embodiment, the control unit 40 controls the first water level gauge when there is no abnormality in the first water level gauge. By setting the water level of the water receiving tanks 110A and 110B to the water level sensor, it is possible to prevent a problem in the water receiving tank control by the control unit 40 even if different detection signals are output by the water level gauge. ..

Further, when "shared" is selected in the water receiving tank selection and there is an abnormality in the first water level gauge, the control unit 40 sets the second water level gauge in the control sensor and determines the water level. Therefore, even when an abnormality occurs in the first water level gauge and the correct water level is not detected, the water supply by the water supply device 10 can be continued by using the signal of the second water level gauge.

According to the water supply device 10 of the present embodiment, in the second water level gauge, "No. 2" is selected in the water receiving tank selection for maintenance of the first water receiving tank 110A, and only the water receiving tank 110B is used. In this case, or when "shared" is selected in the water tank selection and an abnormality occurs in the first water level gauge, it is used as a control sensor. Therefore, the second water level gauge is used less frequently than the first water level gauge. Therefore, as a water level gauge for detecting the water level of the water receiving tank 110B, a water level gauge cheaper than the water level gauge of the water receiving tank 110A may be adopted. For example, the number of electrode rods of the electrode type level switch 120A may be larger than the number of electrode rods of the electrode type level switch 120B. In that case, it is preferable to be able to set the type of water level gauge and the detectable water level for each water receiving tank.

The control unit 40 controls the water receiving tank based on the water level detected by the control sensor. Here, in the water receiving tank control, as for the control of the city water inflow valves 132A and 132B, the opening / closing signal of the city water inflow valves 132A and 132B corresponding to the control sensor may be output from the control unit 40. However, when the water receiving tank selection is "shared", the predetermined city water inflow valves 132A and 132B may be controlled, and different city water inflow valves 132A and 132B may be controlled for each hour, or the city water may be controlled. Both the inflow valves 132A and 132B may be controlled. As a specific example of opening and closing the city water inflow valves 132A and 132B, the control unit 40 detects when the water level detected by the control sensor becomes lower than the valve open water level (for example, the electrode rod 123 is exposed from the water surface). When at least one of the city water inflow valves 132A and 132B is opened, and the water level detected by the control sensor becomes higher than the valve closing level (for example, a part of the electrode rod 124 is submerged). The city water inflow valves 132A and 132B are closed. Further, as a specific example of water tank control, the pump 20 is forcibly stopped when the water level detected by the control sensor becomes lower than the drought water level (for example, the electrode rod 122 is exposed from the water surface). Further, as a water receiving tank control, the control unit 40 issues a drought warning as a drought state when the water level detected by the control sensor becomes lower than the drought water level, and the water level detected by the control sensor becomes higher than the full water level. When the water level becomes high (for example, a part of the electrode rod 125 is submerged), a full water alarm is issued as a full water state. The drought warning and the full water warning may be notified by a buzzer or display on L1, L2, etc. of the display unit 46 as control of the operation panel 44, or may be notified by transmission of a signal from the communication unit 48 to the outside. May be good.

In the above embodiment, the water level determination process of FIG. 2 is repeatedly executed by the control unit 40 at predetermined time intervals, but the present invention is not limited to such an example. For example, when the selection of the water receiving tanks 110A and 110B is changed by an external input, or when an abnormality occurs in at least one of the electrode type level switches 120A and 120B, or when the abnormality is resolved, the control unit 40 controls. The sensor may be set. Then, the control unit 40 may determine the water level of the water receiving tanks 110A and 110B by using the set control sensor.

In the above-described embodiment, when "shared" is selected in the water receiving tank selection, the water levels of the water receiving tanks 110A and 110B are determined by using the control sensor set based on the presence or absence of an abnormality in the first water level gauge. I decided to do it. However, when the control sensor is changed because an abnormality has occurred in the first water level gauge in the above-described embodiment or because the abnormality has been resolved, even if the control sensor is changed after confirming that certain conditions are satisfied. Good. FIG. 3 is a flowchart showing an example of the sensor change determination process executed by the control unit 40. This sensor change determination process is executed when the control sensor is changed by the water level determination process of FIG. 2 when "shared" is selected in the water receiving tank selection. That is, it may be executed when an abnormality occurs in the first water level gauge or when the abnormality in the first water level gauge is resolved.

When the sensor change determination process is executed, the control unit 40 first determines whether or not there is an abnormality in the water level gauge (change sensor) to be used after the change as the control sensor (S210). That is, since an abnormality has occurred in the first water level gauge, when the control sensor is changed from the first water level gauge to the second water level gauge in the water level determination process of FIG. 2, there is no abnormality in the second water level gauge as the process of S210. Whether or not it is determined. As the process of S210, any method may be adopted as in the case of determining the presence or absence of abnormality of the first water level gauge in the water level determination process of FIG. When the control sensor is changed from the second water level gauge to the first water level gauge in the water level determination process of FIG. 2 due to the elimination of the abnormality of the first water level gauge, in the process of S210, the first change sensor is used. The presence or absence of an abnormality in the water level gauge is determined. However, now, we are considering the time when the abnormality of the first water level gauge is resolved, and in this case, the processing of S210 may be omitted. Then, when there is an abnormality in the change sensor (S210: No), the control unit 40 suspends the change of the control sensor (S250) and ends the sensor change determination process. By such control, it is possible to prevent the control sensor from being changed to the water level gauge in which the abnormality has occurred, and it is possible to prevent a malfunction in the control by the control unit 40.

When there is no abnormality in the change sensor (S210: Yes), the control unit 40 subsequently determines whether or not the water level detected by the change sensor indicates a drought state (S220). Then, when the water level detected by the change sensor indicates a drought state (S220: No), the control unit 40 suspends the change of the control sensor (S250) and ends the sensor change determination process. This is based on the fact that the pump 20 is urgently stopped by the control unit 40 when the water level gauges used after the change determine that the water receiving tanks 110A and 110B are in a drought state. Further, if the water level gauge used after the change has a problem that the water level cannot be detected beyond the drought, such as the electrode rod 122 for detecting the drought water level is dropped, the drought state is established. By such control, it is possible to prevent the pump 20 from being forcibly stopped after the water level gauge used for control is changed.

When the water level detected by the change sensor does not indicate a drought state (S220: Yes), the control unit 40 determines whether or not it is determined that the water stop valve 114 is open (S230). Here, the processing of S230 is considered when "shared" is selected in the water receiving tank selection, but it is stopped due to a malfunction of the water stop valve 114 or forgetting to open the water stop valve 114. It is for determining whether the water valve 114 is not closed. As an example, the control unit 40 determines that the water stop valve 114 is closed when at least one of the city water inflow valves 132A and 132B is open and the change sensor does not detect an increase in the water level. Further, the control unit 40 closes the water stop valve 114 when the change sensor does not detect a drop in the water level even though the pump 20 operates when both the city water inflow valves 132A and 132B are closed. Judged as Normally, when the water stop valve 114 is open, at least one of the city water inflow valves 132A and 132B is opened, and when water flows into the water receiving tanks 110A and 110B from the water main, the water receiving tanks 110A and 110B It is based on the fact that both water levels rise at about the same time. Further, if the water stop valve 114 is open, when the pump 20 operates with the city water inflow valves 132A and 132B closed and water is transferred to the water supply device 10, both the water receiving tanks 110A and 110B It is based on the fact that the water level drops at almost the same timing. Then, when the control unit 40 determines that the water stop valve 114 is not open (S230: No), the control unit 40 suspends the change of the control sensor (S250) and ends the sensor change determination process. By such control, it is possible to prevent the control sensor from being changed when the water stop valve 114 is closed even though "shared" is selected in the water receiving tank selection. It is possible to prevent a problem in the water receiving tank control by 40.

When the control unit 40 has no abnormality in the change sensor (S210: Yes), the water level detected by the change sensor does not indicate a drought state (S220: Yes), and the water stop valve 114 is open. (S230: Yes), the control sensor is changed (S240), and the sensor change determination process is terminated.

That is, the return condition for returning the first water level gauge changed due to the abnormality as the water level gauge used for controlling the water receiving tank includes that the water level of the first water receiving tank is higher than the water level in the drought state (S220: Yes). The return condition for returning the second water level gauge changed due to an abnormality as a water level gauge used for controlling the water receiving tank is that the water level in the second water receiving tank is higher than the water level in the drought state (S220: Yes). included. As a result, it is possible to prevent the pump 20 from stopping in a drought state when the water level gauge changed due to an abnormality is returned as the water level gauge used for controlling the water receiving tank.

When the change of the control sensor is suspended in S250, it is preferable to notify the suspension by displaying on the buzzer, the display unit 46, or transmitting a signal from the communication unit 48 to the outside. Further, when the change of the control sensor is suspended, the sensor change determination process may be executed again after a predetermined time (for example, after a few minutes).

Further, when "shared" is selected in the water receiving tank selection, the control unit 40 stops when it is determined that there is a difference of a predetermined amount or more between the water level of the water receiving tank 110A and the water level of the water receiving tank 110B. It may be determined that the water valve 114 is closed. As an example, the control unit 40 has a water stop valve 114 when there is a difference of two or more of a plurality of electrode rods between the detection by the electrode type level switch 120A and the detection by the electrode type level switch 120B. May be determined to be closed. Then, when the control unit 40 determines that the water stop valve 114 is closed even though "shared" is selected in the water receiving tank selection, the buzzer, display on the display unit 46, or communication An alarm may be issued and notified by transmitting a signal from the unit 48 to the outside.

The water level in the water receiving tanks 110A and 110B and the operation of the pump 20 using the determined control sensor will be described. First, when the water supply device 10 is installed, the water level when there is no water in the water receiving tank selected in the water receiving tank selection is the water level below the electrode rod 122 of the control sensor, and the pump 20 becomes drought. Is in a stopped state. In such a drought state, the water level is also below the electrode rod 123, so at least one of the city water inflow valves 132A and 132B is opened to allow water to flow into the water receiving tanks 110A and 110B from the water main to raise the water level. Raise. Here, the drought state should be detected below the drought water level, and then released when the water level rises above an arbitrary water level higher than the drought water level and lower than the full water level. Here, the electrode rod 123 is used as the water level for releasing the drought state, and when at least a part of the electrode rod 123 is submerged in water, the drought state is released and the forced stop of the pump 20 is released. When the water level rises further, at least a part of the electrode rod 124 of the control sensor is submerged in water, and the water level rises above the closed water level, the control unit 40 closes both the city water inflow valves 132A and 132B. Then, the inflow of water into the water receiving tanks 110A and 110B is stopped. When the discharge pressure of the pump 20 drops while the drought state is released, the pump 20 starts and the water in the water receiving tanks 110A and 110B is conveyed to the supply destination. When the water level drops below the electrode rod 123 of the control sensor by starting the pump 20, the control unit 40 opens at least one of the city water inflow valves 132A and 132B, and water flows into the water receiving tanks 110A and 110B. ..

In the above embodiment, signals from the electrode type level switches 120A and 120B are input to the control unit 40, and the control unit 40 sets one of the electrode type level switches 120A and 120B as a control sensor and sets the water receiving tank. It was supposed to be controlled. However, the present invention is not limited to these examples, and as shown in FIG. 4, the electrode type level switches 120A and 120B are connected to the control unit 40 via the changeover switch 150, and only one signal selected by the changeover switch 150 is controlled. It may be input to the unit 40. Specifically, the control unit 40 outputs a signal to the changeover switch 150 so that only the selected control sensor is connected to the I / O unit 47. As an example, the changeover switch 150 is connected to the I / O unit 47 and switches the water level gauge connected to the I / O unit 47 in response to a signal from the control unit 40. Further, the city water inflow valves 132A and 132B may also be connected to the control unit 40 via the changeover switch 160, and an open / close signal may be transmitted from the control unit 40 to one selected by the changeover switch 160. .. As an example, the changeover switch 160 is connected to the I / O unit 47, and switches the city water inflow valve connected to the I / O unit 47 in response to a command from the control unit 40. The switching of the changeover switches 150 and 160 may be interlocked with each other. In such a configuration, the input port of the I / O section to which the electrode type level switches 120A and 120B are connected and the output port of the I / O section to which the city water inflow valves 132A and 132B are connected are shared. This is particularly effective when the number of ports in unit 40 is small.

In the above-described embodiment, when "shared" is selected in the water receiving tank selection, either the water level of the water receiving tank 110A or the water level of the water receiving tank 110B is always selected to control the water receiving tank. However, if there is no abnormality in the water level gauges on both the 1st and 2nd water level gauges, the water receiving tank control is performed using the detection values of both the 1st and 2nd water level gauges. May be good. Specifically, the value of the control sensor in FIG. 2 may be obtained by averaging the detected values of both the first water level gauge and the second water level gauge. In this case as well, if an abnormality occurs in one of the water level gauges, it is advisable to control the water receiving tank only by the signal of the other water level gauge. Further, an analog type water level gauge (for example, a throw-in type water level sensor) may be used for the first water level gauge and the second water level gauge.

A water supply device 10 that pressurizes and supplies water stored in a water receiving tank 110A and a water receiving tank 110B that are communicated by a communication pipe 112 provided with a water stop valve 114 by a pump 20, and detects the water level of the water receiving tank 110A. The control unit 40 includes a control unit 40 that controls the water receiving tank based on at least one of the water level signals of the first water level gauge and the water level signal of the second water level gauge that detects the water level of the water receiving tank 110B. When an abnormality occurs in either the 1st water level gauge or the 2nd water level gauge, the water receiving tank is controlled based on the water level signal of the other water level gauge. As a result, even if an abnormality occurs in one of the water level gauges, water supply can be continued based on the water level signal of the other water level gauge, thereby avoiding water interruption. For example, if the power receiving portion of the electrode rod 122 of the control sensor rusts or falls into the water tank due to aged deterioration, the control unit 40 forcibly stops the pump 20 in a drought state and cuts off the water. However, if the actual water levels in the water receiving tanks 110A and 110B are the water levels at which the pump can be normally started, the control unit 40 simultaneously detects the drought state and the water level higher than that, so that it is possible to determine the abnormality of the water level gauge. Further, the water supply can be continued by switching the control sensor that has become abnormal.

In the above-described embodiment, the water tank selection button 441 selects either "No. 1", "No. 2", or "shared" as the water tank selection, but the water tank selection button is not limited to this. An inflow valve selection button (not shown) may be provided which allows selection of "No. 1" and "No. 2" in 441 and selection of whether to use the city water inflow valve 132A or 132B. With the inflow valve selection button, both "single" that uses only one of the city water inflow valves 132A and 132B, "alternate" that opens and closes the city water inflow valves 132A and 132B alternately, and both the city water inflow valves 132A and 132B. Can be selected as "parallel" to open and close, and when "alternate" or "parallel" is selected, the water tank selection is "shared". Further, even if the water receiving tank is not selected or the water receiving tank is not selected, the control unit 40 may use the control unit 40 when an abnormality of the water level gauge occurs in either the first water level gauge or the second water level gauge. It is advisable to control the water receiving tank based on the water level signal of the water level gauge. In this case, it is preferable to be able to select whether or not to control the water receiving tank based on the water level signal of the other water level gauge when an abnormality of the water level gauge occurs in either the first water level gauge or the second water level gauge. .. When the water receiving tank is not selected, the water receiving tank shared mode is set with the sluice valve 118B released.

In the above-described embodiment, the water level gauge used for controlling the water tank until an abnormality is detected is defined as a regular water level gauge, and the water level gauge used for controlling the water tank after detecting an abnormality in the regular water level gauge is defined as a spare water level gauge. The regular water level gauge is the first water level gauge, and the spare water level gauge is the second water level gauge. Therefore, the control unit 40 controls the water receiving tank based on the water level signal of the regular water level gauge until the first water level gauge, which is the regular water level gauge, detects an abnormality, and after detecting the abnormality in the regular water level gauge, the control unit 40 is reserved. The water receiving tank is controlled based on the water level signal of the second water level gauge, which is an irrigation level gauge.

As described above, the water supply device 10 is connected to a plurality of water receiving tanks 110A and 110B that communicate with each other by a communication pipe 112 provided with a water stop valve 114. Then, the water supply device 10 has a water receiving tank shared mode in which water is supplied in a state where the water receiving tank 110A and the water receiving tank 110B are communicated with each other. Here, in the water receiving tank shared mode, since the water receiving tanks 110A and 110B communicate with each other, both the water receiving tanks 110A and 110B are provided with an inflow pipe provided with a city water inflow valve 132A and a city water inflow valve 132B. It will be downstream of the inflow pipe.

Then, as shown in FIG. 2 as an example, when the control unit 40 detects an abnormality (step S130: No) with the first water level gauge which is a control sensor in the water receiving tank shared mode (step S110: Yes), The water receiving tank is controlled by using a change sensor (second water level gauge in this embodiment) different from the first water level gauge that detects the abnormality. That is, the control sensor that controls the water receiving tank is switched from the first water level gauge in which the abnormality is detected to the second water level gauge. As a result, if an abnormality occurs in the water level gauge used as the control sensor, water supply can be continued based on the water level signal of another water level gauge. Here, the abnormality in step S130 is any of the states described in (1) to (3) below when the water level is detected by the first water level gauge. (1) A drought state in which the water level is below a predetermined level at which the pump 20 is stopped. As a result, it is possible to reduce the water outage due to the drought detection of the control sensor. (2) At the detected water level, a drought state (for example, a state in which the electrode rod 122 is exposed from the water surface) and a full water state (for example, a state in which a part of the electrode rod 125 for detecting a water level higher than the electrode rod 122 is submerged). Is detected at the same time, and there is a contradiction in the detected water level. As a result, the water supply device 10 can accurately detect the abnormality of the electrode type level switch and also detect the wiring error of the signal line of the water level gauge. (3) Contradictory state of water level change. As an example, in a state where a drop in the water level of the water receiving tanks 110A and 110B is not detected during the operation of the pump 20, the control unit 40 stores the water level before the operation of the pump 20 in the storage unit 41, and operates the pump 20. In this state, a water level equal to or higher than the water level before the operation of the stored pump 20 is detected for a predetermined time or longer. In this way, by switching from the water level gauge, which is a contradiction between the operating state of the pump 20 and the water level change, to another water level gauge, normal water receiving tank control can be continued. In the state (3), in particular, when the city water inflow valves 132A and 132B are both closed, that is, when the water level below the water surface of the electrode rod 124 is detected, the pump 20 is operated. A state in which the water level below the closed water level (the electrode rod 124 is exposed from the water surface) cannot be detected even after a predetermined time has passed can be mentioned. In this way, the water level gauge used to control the water receiving tank can be used as another water level gauge from the water level gauge that detects the water level that is inconsistent with the state of the water supply equipment (operating state of the pump 20, open / closed state of the city water inflow valves 132A, 132B, etc.). By switching to, normal water tank control can be continued. Further, in this case, it is assumed that the communication pipe 112 is blocked due to the water stop valve 114 being closed or the like. According to (3), it is possible to prevent the water level gauge of the water receiving tank that cannot be used because the communication pipe 112 is blocked from being used for the water receiving tank control.

Further, in the control unit 40, even if the first water level gauge, which is a regular water level gauge, is in any of the states described in (1) to (3), the second water level gauge, which is a spare water level gauge, is (1) to (1). In any of the states of (3), the control sensor is held as a regular water level gauge as described in step S250 of FIG. As a result, it is possible to prevent the control sensor from being changed to the water level gauge in which the abnormality has occurred, and further to prevent the inching that occurs due to the change in the water level gauge that controls the water receiving tank, so that the water supply device 10 is stable. Can perform water tank control.

Further, after switching the control sensor from the normal water level gauge to the spare water level gauge, the control unit 40 resolves the states (1) to (3) of the first water level gauge (normal water level gauge), and then, as shown in FIG. As described in step S240, the first water level gauge is used as a control sensor. The above-mentioned (1) to (3) are examples of abnormalities for switching the control sensor, and are not limited to these. Further, the control unit 40 may count the number of times the control sensor is switched, and may stop the switching when the count exceeds a predetermined number of times within a predetermined time interval. By limiting the number of times the water level gauge is switched due to an abnormality, it is possible to prevent inching of the water level gauge switching at a site where the water level is unstable, and stable water tank control can be performed.

(Modification example)
In the water supply equipment according to the above-described embodiment, the water supply device 10 is assumed to have two water receiving tanks 110A and 110B connected to the suction side. However, in the water supply device 10, three or more water receiving tanks may be connected to the suction side, or a single water receiving tank may be connected.

FIG. 5 is a diagram showing an example of a water supply facility according to a modified example. The water supply facility 300 of this modified example includes a water supply device 10 having the same configuration as that of the embodiment of FIG. 1A described above, and a single water receiving tank 210 is connected to the upstream side of the water supply device 10. In the water receiving tank 210, water from the water main (not shown), which is a water supply source, is stored by the inflow pipe 230 branched from the introduction pipe 202 communicating with the water main. The inflow pipe 230 is provided with a city water inflow valve 232. The city water inflow valve 232 is a valve capable of shielding the flow path of the inflow pipe 230, and is composed of, for example, an electromagnetic valve, and is controlled by an output signal from the I / O unit 47 of the water supply device 10. However, the opening and closing of the city water inflow valve 232 may be performed without going through the control unit 40.

The water receiving tank 210 is provided with a plurality of water level gauges as water level gauges for detecting the water level in the water receiving tank 210. Specifically, two water level gauges, an electrode type level switch 120A (first water level gauge) and an electrode type level switch 120B (second water level gauge), which detect the water level of the water receiving tank 210, are provided. The signals of the electrode type level switches 120A and 120B are input to the control unit 40. As these electrode type level switches 120A and 120B, those having the same function as the electrode type level switches 120A and 120B of the embodiment can be used, and as an example, each of them has five electrode rods 121 to 125. The electrode type level switches 120A and 120B may have three, four, or six or more electrode rods, or may have different numbers of electrode rods from each other. Further, the water receiving tank 210 is provided with a float switch (not shown), a throw-in type water level gauge, or the like as the first water level gauge or the second water level gauge in place of or in addition to the electrode type level switches 120A and 120B. You may.

The I / O unit 47 of the water supply device 10 inputs the detection signals by the electrode type level switches 120A and 120B. Each of the electrode type level switches 120A and 120B includes a plurality of electrode rods 121 to 125 arranged in the water receiving tanks 110A and 110B. The plurality of electrode rods 121 to 125 are water level detectors, and the common electrode rod 121, the electrode rod 122 for detecting drought, and the city water inflow valve 232 are opened in the order in which the low water level can be detected. The electrode rod 123 for detecting the water level, the electrode rod 124 for detecting the closed water level that closes the city water inflow valve 232, and the electrode rod 125 for detecting full water. Further, the water level for opening the city water inflow valve 232 may be lower than the water level for closing the city water inflow valve 232.

In FIG. 1B, one of "No. 1", "No. 2", and "shared" was selected as the water tank selection by the water tank selection button 441, but the water tank selection button 441 was displayed on the display unit 46. Alternatively or additionally, a water level gauge selection button (not shown) may be provided. By pressing the water level gauge selection button, the water level gauge selection in step S310 of FIG. 6 described later may be performed.

Further, in the water supply device 10 of the water supply facility 300, similarly to the water supply device 10 shown in FIG. 4, electrode type level switches 120A and 120B, which are a plurality of water level gauges, are connected to the control unit 40 via the changeover switch 150 to switch. Only one signal selected by the switch 150 may be input to the control unit 40.

As an example, the water supply device 10 of such a modified example executes the water receiving tank control based on only one of the water level signals of the first water level gauge and the second water level gauge. FIG. 6 shows a water level gauge determination process in the control unit 40 of the water supply device 10 of the modified example. Further, as an example, the regular water level gauge is the first water level gauge, and the spare water level gauge is the second water level gauge.

When the water level gauge determination process is executed, the control unit 40 first determines the currently selected water level gauge (S310). As an example, it is assumed that the water level gauge selected by an external input such as pressing the water level gauge selection button of the display unit 46 is stored in the predetermined area of the storage unit 41, and by referring to the predetermined area of the storage unit 41. It may be assumed that the determination of S310 is performed. In the example shown in FIG. 6, either one of the "first water level gauge" and the "second water level gauge", or "no selection" in which neither of the water level gauges is selected by the external input. Can be selected.

When the "first water level gauge" or the "second water level gauge" is selected (S310: first or second water level gauge), the control unit 40 sets the selected water level gauge as the control sensor (S320). ). That is, when the "first water level gauge" is selected, the control unit 40 sets the first water level gauge (electrode type level switch 120A and / or float switch 140A) as the control sensor, and sets the "second water level gauge". Is selected, the second water level gauge (electrode type level switch 120B and / or float switch 140B) is set as the control sensor. Water tank control is executed using the water level detected by the control sensor. When the control sensor is set, the control unit 40 stores the control sensor set in the storage unit 41. Further, the control unit 40 may display the control sensor stored in the storage unit 41 on the display unit 46 in response to an operation of the setting unit 45 by the operator or the like. Further, the control unit 40 may notify the external terminal 80 of the control sensor currently set in response to the request signal or the like from the external terminal 80 by communication. Then, the control unit 40 determines the water level of the water receiving tank 210 using the set detection value of the control sensor (S360), and ends the water level gauge determination process.

On the other hand, when the water level gauge is not selected by the external input and is "no selection" (S310: no selection), the control unit 40 is that when "shared" is selected as the water tank selection by the water tank selection button 441. Similarly, the regular water level gauge (first water level gauge) is subsequently used to determine whether or not there is any abnormality (S330).

Here, as an example of the abnormality detection conditions of the first water level gauge and the second water level gauge, the water level at which the city water inflow valve 232 is opened (open water level) is detected and at the same time the city water inflow valve 232 is closed. There is a contradiction in the water level detected by the electrode type level switch 120A, such as the detection of (closed water level) or the simultaneous detection of a drought state and a water level state above the drought water level such as a full water level. If it occurs, it is determined that the first water level gauge has an abnormality. Similarly, when the water level detected by the electrode type level switch 120B is inconsistent with respect to the second water level gauge, it is determined that the second water level gauge has an abnormality.

In addition, as another example of the conditions for detecting abnormalities in the first water level gauge and the second water level gauge, the first is when the water level detected by the first water level gauge or the second water level gauge is inconsistent. The water level gauge and the second water level gauge are abnormal. Specifically, the control unit 40 receives water up to the electrode rod 123 for detecting the open water level when the city water inflow valve 232 is opened as a condition for detecting an abnormality in the first water level gauge and the second water level gauge. Abnormality of the 1st and 2nd water level gauges is detected when the rise of the water level is not detected by the 1st and 2nd water level gauges, such as when the water level does not reach or the water does not reach the electrode rod 124 for detecting the closed water level. It is good to do. Or, even though the pump 20 is operated when the city water inflow valve 232 is closed, the water level below the closed water level cannot be detected by the first water level gauge and the second water level gauge, or the water level does not fall below the open water level. When a drop in the water level such as the above is not detected, it is preferable to detect an abnormality in the first water level gauge and the second water level gauge. False detection can be prevented by detecting an abnormality by comparing the values of the first water level gauge and the second water level gauge.

Further, when the water level of the water receiving tank 210 is in a drought state which is equal to or lower than the water level at which the pump 20 is stopped, the water level gauge may be abnormal. As a result, it is possible to reduce the water outage due to the drought detection of the control sensor. Here, the control unit 40 detects an abnormality with the water level gauge that detects the drought state when only one of the first water level gauge and the second water level gauge detects the drought state. You may judge that. In this way, for example, when the electrode rod 122 for detecting the drought water level is falling, the drought state is detected without determining that an abnormality has occurred in the water level gauge, and the pump 20 is urgently stopped. Can be suppressed.

Then, when the control unit 40 determines that there is no abnormality in the first water level gauge, which is the regular water level gauge (S330: Yes), the control unit 40 sets the regular water level gauge in the control sensor (S340). On the other hand, when the control unit 40 determines that the regular water level gauge set in the control sensor has an abnormality (S330: No), the control unit 40 sets a spare water level gauge in the control sensor instead of the regular water level gauge (S350). .. Then, after setting the control sensor, the control unit 40 determines the water level of the water receiving tank 210 from the signals of the electrode rods 121 to 125 of the set control sensor (S360), and ends the water level determination process. That is, the water supply device 10 controls the water receiving tank by using a spare water level gauge (change sensor) which is a water level gauge different from the normal water level gauge that has detected an abnormality. As a result, even when an abnormality occurs in the water level gauge used as the control sensor, water supply can be continued based on the water level signal of another water level gauge.

Next, the sensor change determination process in the water supply device 10 of the modified example will be described. FIG. 7 is a flowchart showing an example of the sensor change determination process executed by the control unit 40 of the modified example. The sensor change determination process is the same as the sensor change determination process of FIG. 3 in the embodiment, except for the processes of step S205, step S206, and step S230A. The sensor change determination process of the modified example is executed when the water level gauge is “no selection” and the control sensor is changed in the water level gauge determination process of FIG. That is, it is executed when an abnormality is detected by the regular water level gauge (first water level gauge) or when the abnormality is resolved by the regular water level gauge. The operations of steps S205 and S206 can also be applied to the flowchart of FIG.

When the sensor change determination process is executed, the control unit 40 first counts the number of times the control sensor has been changed as the number of changes N in S205. Then, when the number of changes N exceeds the predetermined threshold value Nref within the predetermined time interval (S206: No), the change of the control sensor is suspended (S250), and the sensor change determination process is terminated. As a result, it is possible to prevent the water supply from becoming unstable due to repeated switching of the control sensor. That is, it is possible to prevent excessive inching of the change of the water level gauge that controls the water receiving tank, and the water supply device 10 can execute stable water receiving tank control. The number of changes N may be cleared at predetermined time intervals. If the number of changes N is equal to or less than a predetermined threshold value (S206: Yes), the control unit 40 then determines whether or not there is an abnormality in the water level gauge (change sensor) to be used after the change as the control sensor. Is determined (S210). That is, when an abnormality is detected by the regular water level gauge and the control sensor is changed from the regular water level gauge to the spare water level gauge in the water level gauge determination process of FIG. 6 (S330: No), the spare water level gauge is processed in S210. It is determined whether or not there is an abnormality in. As the treatment of S210, any method may be adopted as in the determination of the presence or absence of abnormality of the regular water level gauge in the water level determination processing of FIG. When the control sensor is changed from the spare water level gauge to the regular water level gauge in the water level determination process of FIG. 6 due to the elimination of the abnormality of the regular water level gauge, in the process of S210, the regular water level gauge is used as the change sensor. The presence or absence of abnormality is determined. However, now, we are considering the time when the abnormality of the regular water level gauge is resolved, and in this case, the processing of S210 may be omitted. Then, when there is some abnormality in the change sensor (S210: No), the control unit 40 suspends the change of the control sensor (S250) and ends the sensor change determination process. By such control, it is possible to prevent the control sensor from being changed to the water level gauge in which the abnormality has occurred, and it is possible to prevent a malfunction in the control by the control unit 40. Further, it is possible to prevent inching caused by the change of the water level gauge, such as repeatedly changing the water level gauge that controls the water receiving tank, and the water supply device can execute stable water receiving tank control.

When there is no abnormality in the change sensor (S210: Yes), the control unit 40 subsequently determines whether or not the water level detected by the change sensor indicates a drought state (S220). Then, when the water level detected by the change sensor indicates a drought state (S220: No), the control unit 40 suspends the change of the control sensor (S250) and ends the sensor change determination process. This is based on the fact that the pump 20 is urgently stopped by the control unit 40 when the water level gauge used after the change determines that the water receiving tank 210 is in a drought state. That is, when the water level in all the water level gauges connected to the water supply device 10 is in a drought state, the change of the water level gauge can be avoided and the inching of the change of the water level gauge can be prevented. Further, if the water level gauge used after the change has a problem that the water level cannot be detected beyond the drought, such as the electrode rod 122 for detecting the drought water level is dropped, the drought state is established. By such control, it is possible to prevent the pump 20 from being forcibly stopped after the water level gauge used for control is changed.

When the water level detected by the change sensor does not indicate a drought state (S220: Yes), the control unit 40 determines whether or not a change in the water level is detected by the change sensor (S230A). That is, it is determined whether or not the water level change is inconsistent. When the city water inflow valve 232 is open, the water level of the water receiving tank 210 rises, and the water level of the water receiving tank 210 falls due to the operation of the pump. As an example, the inconsistent state of water level change is that when a predetermined time has passed since the city water inflow valve 232 was opened, the water did not reach the electrode rod 123 for detecting the open water level, or the closed water level was detected. Indicates a state in which water does not reach the electrode rod 124 for the purpose. That is, since the water level detected by the change sensor does not correspond to the "openness" of the city water inflow valve 232 and the water level does not rise, it may be determined that the water level change is inconsistent (S230A: No). Further, as another example of the inconsistent state of water level change, even though the pump 20 is started when the city water inflow valve 232 is closed, that is, above the water level at which the city water inflow valve 232 is closed. It indicates a state in which the water level does not drop below the electrode rod 124 for detecting the closed water level, or does not drop below the electrode rod 123 for detecting the open water level. That is, the control unit 40 is the pump 2.
The water level detected by the change sensor before starting 0 is stored in the storage unit 41, and even though the pump 20 has been operated for a predetermined time or longer, the water level before the operation of the pump 20 stored in the storage unit 41 by the change sensor is stored. When it is determined that a water level lower than the water level is not detected, the change of the water level gauge for controlling the water receiving tank is suspended (S250) as the water level change is inconsistent (S230A: No), and the sensor change determination process is terminated. .. As a result, the water supply device can accurately detect the abnormality of the electrode type level switch. By such control, it is possible to prevent the control sensor from being changed when the water level detected by the change sensor is considered to be abnormal, and it is possible to prevent a problem in the water receiving tank control by the control unit 40. ..

The determination of the abnormality of the water level gauge in S210 and the determination of whether or not the water level detected by the change sensor in S230A corresponds to the opening and closing of the city water inflow valve 232 are performed at the timings of S210 and S230A. The determination result executed at all times or at an arbitrary timing while the control unit 40 is energized may be stored in the storage unit 41, and the stored determination result may be referred to at the timings of S210 and S230A. Similarly, in S230 of FIG. 3 described above, the control unit 40 detects the “partition valve closing” at an arbitrary timing, stores the detected “partition valve closing” in the storage unit 41, and stores the detected “partition valve closing” in the storage unit 41. In step S230, the stored "sluice valve closing" may be referred to.

Then, the control unit 40 has no abnormality in the change sensor (S210: Yes), the water level detected by the change sensor does not indicate a drought state (S220: Yes), and the water level detected by the change sensor is city water. When the inflow valve 232 is open / closed (S230A: Yes), the control sensor is changed to the change sensor (S240), and the sensor change determination process is terminated.

According to the water supply device 10 of the modified example, it is a water supply device that pressurizes and supplies the water stored in the water receiving tank 210 by the pump 20, and is a first water level gauge and a second water level that detect the water level of the water receiving tank 210. A control unit 40 that controls the water receiving tank based on at least one water level signal of the meter is provided, and the control unit 40 detects the abnormality of either the first water level gauge or the second water level gauge, and the other water level. The water receiving tank is controlled based on the water level signal of the meter. That is, the control unit 40 sets at least one of the plurality of water level gauges as a control sensor for detecting the water level used for the water receiving tank control, and when the control sensor detects a predetermined abnormality, The water receiving tank is controlled by using a change sensor that is a water level gauge different from the water level gauge that detected the abnormality. Even in the water supply device 10 of such a modified example, even when an abnormality occurs in one of the water level gauges, the water receiving tank is controlled based on the water level signal of the other water level gauge to continue water supply and avoid water interruption. can do.

As described above, in all the above-described embodiments and modifications, the water supply device 10 pressurizes the liquid stored in the water receiving tank 210 or the water receiving tanks 110A and 110B by the pump 20 and supplies the water to the water supply destination. The water supply device 10 includes a control unit 40 that controls the water receiving tank based on the water level signal of at least one of the water level gauges for detecting the water levels of the water receiving tank 210 or the water receiving tanks 110A and 110B. Reference numeral 40 denotes a water level gauge set at least one of a plurality of water level gauges as a control sensor for detecting the water level used for controlling the water receiving tank, and when a predetermined abnormality is detected by the control sensor, the abnormality is detected. The water receiving tank is controlled using a change sensor, which is a water level gauge different from the water level gauge. As a result, even when an abnormality occurs in the water level gauge used as the control sensor, water supply can be continued based on the water level signal of another water level gauge. The water level gauge that controls the water tank, which has been changed due to an abnormality, may return to the control sensor that controls the water tank by an external input such as pressing an alarm release button provided on the operation panel 44.

Here, as an example of an abnormality in which the water level gauge that controls the water receiving tank is used as the change sensor, the water level detection by the corresponding water level gauge is in any of the states described in (1) to (3) below. (1) A drought state where the water level is below a predetermined level at which the pump 20 is stopped, (2) A drought state (a state where the electrode rod 122 is exposed from the water surface) and a full state (one of the electrode rods 125) at the electrode rods 121 to 125. There is a contradiction in the detected water level, such as the state where the part is submerged), and (3) the contradiction state of the water level change. Specifically, as an example of the "contradiction state of water level change", when at least one of the city water inflow valves 132A and 132B is open, the control unit 40 does not detect a rise in the water level by the change sensor. It is determined that the water level change is inconsistent and the water stop valve 114 is closed. That is, the control unit 40 stores the water level immediately before at least one of the city water inflow valves 132A and 132B is opened in the storage unit 41, and after at least one of the city water inflow valves 132A and 132B is opened, the pump 20 If the water level below the memorized water level is detected for a predetermined time even though the water level is stopped, it is determined that the water level is inconsistent. Further, when the change sensor does not detect a drop in the water level even though the pump 20 is operated when the city water inflow valves 132A and 132B are both closed, the control unit 40 is in a "contradiction state of water level change". Therefore, if the water receiving tank is a two-tank type, it is determined that the water stop valve 114 is closed. In the two-tank type of water receiving tank, normally, if the water stop valve 114 is open, at least one of the city water inflow valves 132A and 132B is opened, and when water flows into the water receiving tanks 110A and 110B from the water main, the water receiving tank It is based on the fact that the water levels of both 110A and 110B rise at almost the same timing. Further, if the water stop valve 114 is open, when the pump 20 operates with the city water inflow valves 132A and 132B closed and water is transferred to the water supply device 10, both the water receiving tanks 110A and 110B It is based on the fact that the water level drops at almost the same timing.
When the city water inflow valves 132A and 132B or the city water inflow valve 232 are closed together, that is, when the water level at which the electrode rod 124 is exposed from the water surface is detected, the pump 20 is closed. A drop in water level such as a water level below the water level (a part of the electrode rod 124 is below the water surface) cannot be detected, or a water level below the open water level (the electrode rod 123 is exposed from the water surface) cannot be detected. That is, the drop in the water level is not detected during the operation of the pump 20, and the water level above the water level before the operation of the pump 20 is detected for a predetermined time or longer.

Further, if the control sensor is abnormal (for example, the abnormality shown in (1) to (3)) but the change sensor is abnormal (for example, the abnormality shown in (1) to (3)), the control unit 40 may use the control unit 40. The change of the control sensor is suspended. Then, after the control sensor is changed due to an abnormality, the return condition for returning the water level gauge changed due to the abnormality as a control sensor is that the detected water level of the water level gauge to be returned is higher than the water level in the drought state. Includes high.

The water supply device 10 may include three or more water level gauges for detecting the water level of the water receiving tank 210. In that case as well, the water receiving tank is controlled based on at least one water level signal among the plurality of water level gauges of the control unit. Then, when an abnormality is detected in any one of the plurality of water level gauges, the control unit 40 controls the water receiving tank based on the water level signals of the other water level gauges. For example, when the control unit 40 detects the drought state of the water level gauge by any one of the plurality of water level gauges, the control unit 40 controls the water level gauge based on the water level signals of the other water level gauges.

Here, the control unit 40 uses any one of the plurality of water level gauges as a regular water level gauge, uses the other water level gauge as a spare water level gauge, and uses the regular water level gauge until some abnormality is detected by the regular water level gauge. The water receiving tank is controlled based on the water level signal of. Then, after detecting an abnormality in the regular water level gauge, it is preferable to control the water receiving tank based on the water level signal from the spare water level gauge. Specifically, when a total of three water level gauges, a first water level gauge, a second water level gauge, and a third water level gauge, are provided in the water receiving tank 210, the regular water level gauge is used as the first water level gauge and the first reserve water level. The meter is the second water level gauge, the second reserve water level gauge is the third water level gauge, and when an abnormality is detected by the first water level gauge, the water receiving tank is controlled based on the water level signal of the second water level gauge, and further. When an abnormality is detected by the first water level gauge and / or the second water level gauge, the water receiving tank is controlled based on the water level signal of the third water level gauge. Similarly, when three or more water level gauges are provided in the water receiving tank 110A and the water receiving tank 110B communicating with each other by the communication pipe 112, one of the plurality of water level gauges is used as a regular water level gauge, and the other water level gauge is reserved. It is advisable to use a water level gauge and control the water receiving tank based on the water level signal of the regular water level gauge until some abnormality is detected by the regular water level gauge.

Further, the regular water level gauge and the reserve water level gauge may be composed of a plurality of water level gauges. In that case, the average of the water levels, the maximum value of the water level, the minimum value of the water level, etc. detected by the plurality of water level gauges may be used as the detection values of the regular water level gauge and the reserve water level gauge. Further, the regular water level gauge may be a water level gauge (electrode type level switch or throw-in type water level sensor) capable of detecting a plurality of water levels, and the reserve water level gauge may be a float switch or the like that detects a single water level (for example, only drought). ..

Further, in all the above-described examples and modifications, the abnormality of the input / output circuit to the water level gauge in the I / O unit 47 may be included in the abnormality of the corresponding water level gauge. Further, when the detection signal of the water level gauge is input to the I / O unit 47 of the water supply device 10 by wireless or wired communication, the control unit 40 detects a communication abnormality between the water level gauge and the water supply device 10 and the corresponding water level gauge. It may be included in the abnormality of. In either case, if the water level gauge that detected the abnormality is a control sensor, the control sensor is changed to a change sensor. Further, when an abnormality in the input / output circuit of the water level gauge in the I / O unit 47, a communication abnormality, or the like occurs, it is preferable that the detection signal in the water level gauge is not input to the control unit 40 and the drought state is determined.

In addition, in all the above-mentioned examples and modifications, as another example under the condition of detecting abnormality of a plurality of water level gauges, there is a case where a predetermined water level difference occurs in the water level detected by each water level gauge. May be included. For example, if the water level gauge is an electrode type level switch 120A or 120B provided with a plurality of electrode rods 121 to 125, the electrode type level switch 120A detects a drought state, the electrode type level switch 120B detects a full state, and the like. If a water level difference between one or more or two or more electrodes is detected between the first water level gauge and the second water level gauge, the water level gauge may be abnormal. In this case, if there is a water level gauge in which the fluctuation of the water level cannot be confirmed among the plurality of water level gauges, only the water level gauge may be regarded as abnormal.

(Second Embodiment)
FIG. 8 is a diagram showing an example of the water supply facility according to the second embodiment. Similar to the water supply facility 300 shown in FIG. 5, the water supply facility 1000 of the present embodiment includes a water supply device 10, and a single water receiving tank 210 (water tank) is connected to the upstream side of the water supply device 10. In the water receiving tank 210, water (conveyed liquid) from the water main (not shown), which is a water supply source, is stored by the inflow pipe 230 branched from the introduction pipe 202 communicating with the water main. The inflow pipe 230 is provided with a city water inflow valve 232. The city water inflow valve 232 is a valve capable of shielding the flow path of the inflow pipe 230, and is composed of, for example, an electromagnetic valve, and is controlled by an output signal from the I / O unit 47 of the water supply device 10. However, the opening and closing of the city water inflow valve 232 may be performed without going through the control unit 40.

The water receiving tank 210 is provided with a water level meter 1120 for detecting the water level in the water receiving tank 210. Specifically, the water level gauge 1120 has the same function as the electrode type level switches 120A and 120B, and is input to the control unit 40. Further, instead of or in addition to the water level gauge 1120, a float switch (not shown), a throw-in type water level gauge, or the like may be provided.

The control unit 40 determines the water level state of the water receiving tank 210 based on the water level signal input from the water level gauge 1120, and executes the water receiving tank control (water tank control) based on the determined water level state. The water receiving tank control includes opening / closing control of the city water inflow valve 232, forced stop of the pump 20 due to a drought state, display of a water level warning on the operation panel 44, an external terminal 80, etc., and a city water inflow valve 232 opening / closing signal and a water level warning. Etc., at least one of external outputs such as is included.

The I / O unit 47 of the water supply device 10 has common terminals E15 and E33 and input terminals E11 to E14, E31 and E32 for inputting the detection signal by the water level gauge 1120 in order to input the signal of the water level gauge (FIG. 10). -See FIG. 13). As an example, the water level gauge 1120 shown in FIG. 8 includes a plurality of electrode rods 1121 to 1125 arranged in the water receiving tank 210. Specifically, the electrode rods 1121 to 1125 are a common electrode rod 1121 connected to the common terminal E15, an electrode rod 1122 connected to the terminal E14 for detecting drought, and a city water inflow valve connected to the terminal E13. To the electrode rod 1123 for detecting the open water level that opens 232 or for detecting the recovery from drought, the electrode rod 1124 for detecting the closed water level that closes the city water inflow valve 232 connected to the terminal E12, and the terminal E11. It is an electrode rod 1125 for detecting full water to be connected. Electrode rods for detecting from the lowest water level are connected in the order of input terminals E14 to E11.

Here, in the present embodiment, the control unit 40 detects the water level state of the water receiving tank 210 based on a predetermined detection condition (hereinafter, referred to as “water level level detection condition”), and the detected water level state is a predetermined abnormality. When it is determined that the water level is in the water level state, the water level level detection condition is changed from the first detection condition to the second detection condition.
FIG. 9 is a flowchart showing the switching of the water level level detection condition from the first detection condition to the second detection condition. This flowchart is constantly executed by the control unit 40.

(Step S1000)
When the power is turned on to the control unit 40, the water level level detection condition is set as the first detection condition. Specifically, the control unit 40 sets the electrode rod 1122 as the drought water level, the electrode rod 1123 as the open water level, the electrode rod 1124 as the closed water level, and the electrode rod as the first detection conditions. Assign a full water level to 1125. It is preferable that the setting of the first detection condition can be changed by an external input.

(Step S1010)
The control unit 40 detects the water level state of the water level of the water receiving tank 210 at the water level assigned to the plurality of electrode rods 1121 to 1125. Specifically, when the electrode rod 1122 to which the drought water level is assigned is exposed from the water surface, the control unit 40 loses the continuity between the common electrode rod 1121 and the electrode rod 1122, so that the water level signal input from the water level gauge 1120 is lost. Is determined to be below the drought water level, and the drought state is detected as the water level state. When the control unit 40 detects a drought state, it lights L2 (see FIG. 1B) of the operation panel 44 as a water tank control and abnormally stops the water supply control of the pump 20. Further, when the electrode rod 1123 to which the water level of the open water level is assigned is exposed from the water surface, the control unit 40 loses the continuity between the common electrode 1121 and the electrode rod 1123, so that the water level signal input from the water level gauge 1120 is the open water level. It is judged that the water level is lower than the water level of, and the open water level state is detected as the water level state. As a water receiving tank control, the control unit 40 externally outputs a contact signal for opening the city water inflow valve 232 when the open water level state is detected. When at least a part of the electrode rod 1124 to which the water level of the closed water level is assigned is submerged, the control unit 40 conducts the common electrode 1121 and the electrode rod 1124, so that the water level signal input from the water level gauge 1120 is the closed water level. Assuming that the water level is above the water level, the closed water level state is detected as the water level state. When the control unit 40 detects the closed water level state, it externally outputs a contact signal for closing the city water inflow valve 232 as a water receiving tank control. When at least a part of the electrode rod 1125 to which the full water level is assigned is submerged, the control unit 40 conducts the common electrode rod 1121 and the electrode rod 1125, so that the water level signal input from the water level gauge 1120 is the water level of the full water level. Assuming that it is above the level, a full water state is detected as a water level state. When the control unit 40 detects that the water is full, it lights L1 (see FIG. 1B) of the operation panel 44 as a water tank control. In the drought state, the pump 20 is forcibly stopped from the automatic operation by the water supply control described above by the water receiving tank control described above, so that the water supply destination is cut off. On the other hand, if the pump 20 is not in a drought state, the pump 20 continues to operate automatically by the water supply control described above.

(Step S1020)
Next, the control unit 40 determines whether or not the water level state detected in step S1010 is an abnormal water level state. For example, the control unit 40 determines that the water level is abnormal due to the contradiction of the water level detected by the water level gauge 1120. Here, in the state where the water level is inconsistent, an electrode that detects a state in which at least one of the plurality of electrode rods 1122 to 1125 is exposed from the water surface and at the same time detects a water level higher than the exposed electrode rods. This is the state in which a part of the rod is submerged. Further, the state in which the water level detected by the water level gauge 1120 is inconsistent is lower than that of the exposed electrode rods at the same time as detecting the state in which at least one of the plurality of electrode rods 1122 to 1125 is submerged. This is a state in which the electrode rod for detecting the water level is detected to be exposed from the water surface. As an example, a drought state and a closed water level state are detected at the same time.
Then, when the control unit 40 determines that the water level is abnormal (step S1020; Yes), the control unit 40 moves to step S1030, and when it determines that the water level is not abnormal (step S1020; No), returns to step S1010 and the first detection condition. Detects the water level condition at.

(Step S1030)
From this step onward, as the abnormal water level state in step S1020, the electrode rods 1122 to 1125 detect a state in which the electrode rod 1122 is exposed from the water surface (drought) and at the same time detect a water level higher than the exposed electrode rod. The case where at least one of them is submerged (any of the open water level, the closed water level, and the water level above the full water level) is detected.

In step S1030, the control unit 40 changes the water level level detection condition from the first detection condition to the second detection condition. Specifically, the control unit 40 allocates the drought, which is the water level level determined to be in the abnormal water level state under the first detection condition, to the electrode rod 1123 instead of the electrode rod 1122 under the second detection condition. .. Further, under the second detection condition, the electrode rod 1123 is further assigned an open water level, the electrode rod 1124 is assigned a closed water level, and the electrode rod 1125 is assigned a full water level. In this way, under the second detection condition, instead of the electrode rod determined to be in the abnormal water level state (electrode rod 1122 in this embodiment), the water level next to the water level in which the abnormal water level state is detected is detected. The water level in the abnormal water level state (drought in this embodiment) is detected by the electrode rod (electrode rod 1123 in this embodiment). In the present embodiment, the "electrode rod (referred to here as the electrode rod N2) that detects the water level next to the electrode rod (referred to as the electrode rod N1)" detects the water level higher than the electrode rod N1. This means an electrode rod for detecting the next lowest water level after the electrode rod N1 among all the electrode rods included in one water level gauge. That is, in the plurality of electrode rods included in the water level gauge, the lower end of the electrode rod N1 is installed at a position next to the lower end of the electrode rod N2. Further, in the present embodiment, the "electrode rod (referred to here as electrode rod N4) that detects the water level next to the electrode rod (referred to as electrode rod N3 here)" detects the water level lower than that of the electrode rod N3. It is an electrode rod, and means an electrode rod for detecting the next highest water level after the electrode rod N3 among all the electrode rods included in the water level gauge. That is, in the plurality of electrode rods included in the water level gauge, the lower end of the electrode rod N3 is installed at the position next to the lower end of the electrode rod N4.

When the control unit 40 determines that the water level is abnormal under the first detection condition, the control unit 40 determines the abnormal electrode rod and / or the abnormal water level level based on the detection signal from the water level gauge. It may be specified. When a contradictory water level state is detected, the control unit 40 abnormally stops the pump 20 with the water level level detection condition as the first detection condition until the abnormal electrode rod and / or the water level level is specified. Then, once the abnormal electrode rod and / or the water level is identified, the water level level detection condition may be changed to the second detection condition.

When the control unit 40 detects a state in which a certain electrode rod is exposed from the water surface and detects a state in which two or more of the electrode rods that detect a water level higher than the electrode rod are submerged, the control unit 40 determines the exposed state. The detected electrode rod may be determined to be abnormal. Further, when the control unit 40 detects a state in which a certain electrode rod is submerged and detects a state in which two or more of the electrode rods that detect a water level lower than the electrode rod are exposed from the water surface, the control unit 40 is submerged. You may judge that the electrode rod which detected the said state is abnormal.

Further, when the drought state is detected, the control unit 40 may determine that the electrode rod 1122 for detecting the drought and / or the drought is abnormal. This is based on the second embodiment, in which the control unit 40 normally controls the water receiving tank so as not to reach a drought state. In other words, when the control unit 40 controls to abnormally stop the pump 20 when a state above a certain water level (for example, a full state) or a state below a certain water level (for example, a drought state) is reached, the control unit 40 is concerned. The electrode rod that has detected the state may be determined to be abnormal.

Further, when the water level of the water tank is detected by using a water level gauge including a plurality of electrode rods, the abnormal water level state may be caused by the falling (falling off) of the electrode rods. Therefore, when a contradictory water level state is detected, the electrode rod showing the detection result when the electrode rod falls may be determined to be abnormal. For example, consider a case where the electrode rods 1122 and 1124 are detected in a submerged state, and the electrode rods 1123 and 1125 are detected in a state where they are exposed from the water surface. At this time, in an environment where it is assumed that the electrode rod falls and is exposed from the water surface (for example, the fall of the electrode rod cuts the wiring from the electrode rod to the I / O portion 47). Under the environment), it is preferable that the electrode rod 1123 that has detected the state of being exposed from the water surface is determined to be abnormal. Further, in an environment where it is assumed that the electrode rod is submerged due to the fall of the electrode rod (for example, the electrode rod is located at the bottom of the water tank due to the fall of the electrode rod, and I In an environment where the wiring to / O portion 47 is maintained), it is preferable that the electrode rod 1124, which has detected the submerged state, is determined to be abnormal.

If the electrode rod is normal and the detection by the electrode rod is within the predetermined detection range, the control unit 40 may determine that the electrode rod detected outside the detection range is abnormal. Further, if the control unit 40 determines an electrical abnormality of the water level gauge 1120, the abnormal water level state may be set. For example, when the water level gauge 1120 detects a signal using an AC signal, the control unit 40 may put the corresponding electrode rod in an abnormal water level state if the input signal from the water level gauge 1120 continues to be ON for a predetermined time or longer. ..

(Step S1040)
Under the second detection condition, the control unit 40 detects the drought by the electrode rod 1123 instead of detecting the drought by the electrode rod 1122. In this case, since the electrode rod 1123 also detects the water level of the drought and the open water level, a detection timer may be used to detect at least one of the water level levels. Specifically, the city water inflow valve 232 may be opened at a water level of 1123 or less of the electrode rod, and if the water level of 1123 or less of the electrode rod continues even after a lapse of a predetermined time, a drought state may be established.
As described above, in the present embodiment, the control unit 40 can continue the water receiving tank control by using an electrode rod different from the electrode rod in which the water level level is not normally detected.

(Step S1050)
The control unit 40 returns to step S1000 when an alarm reset is input by an external input while detecting the water level of the water receiving tank 210 under the second detection condition, and changes the water level state under the first detection condition. To detect.

10, FIG. 11, FIG. 12, and FIG. 13 are diagrams showing another configuration example of an electrode type level switch as a water level gauge in the water supply facility 1000. The arrows in the figure indicate the detection conditions for the water level state at each water level. The control unit 40 provides common terminals E15 and E33 and input terminals E11 to E14, E31 and E32 for inputting signals of the respective electrode rods as terminals for inputting the signal of the electrode type level switch to the I / O unit 47. Have. As the water level gauges in the water supply facility 1000, the water level gauge 1120 shown in FIG. 8, the water level gauge 1220 shown in FIG. 10, the water level gauge 1320 shown in FIG. 11, the water level gauge 1420 shown in FIG. 12, and the water level gauge 1520 shown in FIG. It is preferable that the setting of which water level gauge is used can be changed by an external input. Further, in FIGS. 10, 11, 12, and 13, the electrode rod is directly connected to the I / O portion 47, but the electrode rod may be connected to the I / O portion 47 via a cable or the like. Alternatively, the detection signal on the water level gauge 120 may be transmitted to the I / O unit 47 by any wireless or wired communication.

The water level gauge 1220 shown in FIG. 10 detects the water level with four electrode rods 1221 to 1224. FIG. 10 (A) shows the water level level under the first detection condition, and FIG. 10 (B) shows the water level level under the second detection condition. As one embodiment, in the water supply facility 1000 of FIG. 8, the water level gauge 1220 shown in FIG. 10 is used instead of the water level gauge 1120.

As shown in FIG. 10 (A), the water level gauge 1220 has four electrode rods 1221 to 1224. As the first detection condition, the control unit 40 uses the electrode rod 1221 connected to the common terminal E15 as a common, the water level of drought at the electrode rod 1222 connected to the terminal E14, and the electrode rod 1223 connected to the terminal E13. The water level for returning to drought and the water level for full water are assigned to the electrode rod 1124 connected to the terminal E11.

Then, the control unit 40 detects a drought state and a full water state as the water level state based on the first detection condition. Specifically, as shown by the arrow 1231, the control unit 40 sets the drought state below the drought water level where there is no continuity between the common electrode rod 1221 and the electrode rod 1222, and lights L2 of the operation panel 44 for water tank control. The water supply control of the pump 20 is interrupted and forcedly stopped. Then, as shown by the arrow 1231, after the drought is detected, the drought recovery is detected at the drought return water level or higher at which the common electrode rod 1221 and the electrode rod 1223 are conductive, the L2 of the operation panel 44 is turned off, and the water supply control of the pump 20 is performed. To restore the operation by. Then, as shown by the arrow 1232 in the figure, the common electrode rod 1221 and the electrode rod 1224 are filled with water above the conductive full water level, and the common electrode rod 1221 and the electrode rod 1224 are not connected to each other and are below the full water level. Release the full state with.

Here, even though the water level of the water receiving tank 210 is equal to or higher than the water level for returning to drought, the electrode rod 1222 to which the drought water level is assigned falls from the water level gauge 1220, and the control unit 40 uses the common electrode rod. If the continuity between the 1221 and the electrode rod 1222 cannot be detected, a contradictory water level state is obtained in which the drought water level or lower and the drought recovery water level or higher are detected. Therefore, the control unit 40 determines that the abnormal water level state (step S1020; Yes), and switches the water level level detection condition from the first detection condition to the second detection condition (step S1030). Next, an example of the second detection condition is shown in FIG. 10 (B).

In the water level gauge 1220 having four electrodes shown in FIG. 10B, as the second detection condition, the control unit 40 uses the electrode rod 1221 as a common and sets the water level next to the electrode rod 1222 in the abnormal water level state. The electrode rod 1223 to be detected is assigned a drought water level and a drought recovery water level, and the electrode rod 1224 is assigned a full water level. Then, the control unit 40 detects a drought state and a full water state as the water level state based on the second detection condition. Specifically, as shown by the arrow 1241 in the drawing, the control unit 40 is in a drought state below the drought water level where there is no continuity between the common electrode rod 1221 and the electrode rod 1223, and the operation panel 44 controls the water receiving tank. L2 is turned on and the water supply control of the pump 20 is interrupted to stop abnormally. Then, as shown by the arrow 1241, the drought state is released at the drought return water level or higher at which the common electrode rod 1221 and the electrode rod 1223 are conductive after the drought is detected, L2 of the operation panel 44 is turned off, and the water supply of the pump 20 is turned off. Restore controlled operation. Then, as shown by arrow 1242, the common electrode rod 1221 and the electrode rod 1224 are filled with water above the conductive full water level, and the common electrode rod 1221 and the electrode rod 1224 are filled with water below the full water level without continuity. To cancel.

In the present embodiment, when the electrode rod 1222 for detecting the drought water level becomes abnormal, the drought water level is assigned to the electrode rod 1223 for detecting the next highest water level instead of the electrode rod 1222. In one embodiment, if the electrode rod 1222 that detects the drought water level becomes abnormal, the drought water level may be assigned to the electrode rod 1224 that detects a higher water level instead of the electrode rod 1222.

In this way, when the electrode rod 1222 that detects the drought water level becomes abnormal, by assigning the drought water level to the electrode rod that detects a higher water level instead of the electrode rod 1222, the pump 20 can receive the water tank. It is automatically operated only when the water level of 210 is equal to or higher than the drought water level under the first condition. As a result, water supply can be continued while preventing the pump 20 from running idle. In addition, the water receiving tank control can be continued by using an electrode rod different from the electrode rod in which the water level level is not normally detected.

The water level gauge 1320 shown in FIG. 11 detects the water level with five electrode rods 1321 to 1325. FIG. 11A shows the water level under the first detection condition, and FIG. 11B shows the water level under the second detection condition. In one embodiment, in the water supply facility 1000 shown in FIG. 8, the water level gauge 1320 shown in FIG. 11 is used instead of the water level gauge 1120.

As shown in FIG. 11A, the water level gauge 1320 has five electrode rods 1321-1325. As the first detection condition, the control unit 40 uses the electrode rod 1321 connected to the common terminal E15 of the I / O unit 47 as a common, the electrode rod 1322 connected to the terminal E14, the drought water level, and the terminal E13. The electrode rod 1323 to be connected is assigned a water level for returning to drought, the electrode rod 1324 connected to terminal E12 is assigned a water level for reduced water, and the electrode rod 1325 connected to terminal E11 is assigned a water level for full water.

Then, the control unit 40 detects a drought state, a reduced water state, and a full water state as the water level state based on the first detection condition. Specifically, as shown by arrow 1331, the control unit 40 makes the drought state below the drought water level at which there is no continuity between the common electrode rod 1321 and the electrode rod 1322, and lights L2 of the operation panel 44 for water tank control. The water supply control of the pump 20 is interrupted and forcedly stopped. Then, after the drought is detected, the drought state is released at the drought return water level or higher at which the common electrode rod 1321 and the electrode rod 1323 are conducted, the L2 of the operation panel 44 is turned off, and the operation by the water supply control of the pump 20 is restored. Then, as shown by arrow 1332, the water is reduced below the water reduction level at which there is no continuity between the common electrode rod 1321 and the electrode rod 1324, and the water is reduced above the water reduction level at which the common electrode rod 1321 and the electrode rod 1324 are conductive. To release. As shown by the arrow 1333, the common electrode rod 1321 and the electrode rod 1325 are filled with water above the conductive full water level, and the common electrode rod 1321 and the electrode rod 1325 are released from the full water level below the non-conducting full water level. ..

Here, even though the water level of the water receiving tank 210 is equal to or higher than the water level for returning to drought, the electrode rod 1322 to which the drought water level is assigned falls from the water level gauge 1320, and the control unit 40 uses the common electrode rod. If the continuity between the 1321 and the electrode rod 1322 cannot be detected, a contradictory water level state in which the drought level or lower and the drought recovery level or higher are detected will occur. Therefore, the control unit 40 determines that the electrode rod 1322 is in the abnormal water level state (step S1020; Yes), and switches the water level level detection condition from the first detection condition to the second detection condition (step S1030). Next, an example of the second detection condition is shown in FIG. 11 (B).

In the water level gauge 1320 having five electrodes shown in FIG. 11B, as the second detection condition, the control unit 40 uses the electrode rod 1321 as a common and detects the water level next to the electrode rod 1322 in the abnormal water level state. In this order, the electrode rod 1323 is assigned the drought water level, the electrode rod 1324 is assigned the drought recovery water level and the reduced water level, and the electrode rod 1325 is assigned the full water level.

Then, the control unit 40 detects a drought state, a reduced water state, and a full water state as the water level state based on the second detection condition. Specifically, as shown by the arrow 1341, the control unit 40 sets the drought state below the drought water level where there is no continuity between the common electrode rod 1321 and the electrode rod 1323, and lights L2 of the operation panel 44 for water tank control. The water supply control of the pump 20 is interrupted and abnormally stopped. Then, as shown by the arrow 1341, the drought state is released at the drought return water level or higher at which the common electrode rod 1321 and the electrode rod 1324 are conducted after the drought is detected, the L1 of the operation panel 44 is turned off, and the water supply control of the pump 20 is performed. To restore the operation by. Further, as shown by the arrow 1342, the water is reduced below the water-reduced water level at which there is no continuity between the common electrode rod 1321 and the electrode rod 1324, and the water is reduced above the water-reduced water level at which the common electrode rod 1321 and the electrode rod 1324 are conductive. To cancel. Further, as shown by arrow 1343, the common electrode rod 1321 and the electrode rod 1325 are filled with water above the conductive full water level, and the common electrode rod 1321 and the electrode rod 1325 are filled with water below the full water level without continuity. To cancel.

In the present embodiment, when the electrode rod 1322 for detecting the drought water level becomes abnormal, the drought water level is assigned to the electrode rod 1323 for detecting the next highest water level instead of the electrode rod 1322. In one embodiment, if the electrode rod 1322 that detects the drought water level becomes abnormal, the drought water level may be assigned to the electrode rods 1324 and 1325 that detect a higher water level instead of the electrode rod 1322.

In this way, when the electrode rod 1322 that detects the drought water level becomes abnormal, the water level of the water receiving tank is determined by assigning the drought water level to the electrode rod that detects a higher water level instead of the electrode rod 1322. The pump 20 is automatically operated only when the water level is equal to or higher than the above level. As a result, water supply can be continued while preventing the pump 20 from running idle. In addition, the water receiving tank control can be continued by using an electrode rod different from the electrode rod in which the water level level is not normally detected.

The water level gauge 1420 shown in FIG. 12 detects the water level with five electrode rods 1421-1425. FIG. 12A shows the water level level under the first detection condition, and FIG. 12B shows the water level level under the second detection condition. As one embodiment, in the water supply facility 1000, the water level gauge 1420 shown in FIG. 10 is used instead of the water level gauge 1120.

As shown in FIG. 12 (A), the water level gauge 1420 has five electrode rods 1421-1425. As the first detection condition, the control unit 40 uses the electrode rod 1421 connected to the common terminal E15 of the I / O unit 47 as a common, the electrode rod 1422 connected to the terminal E14, the drought water level, and the terminal E13. The water level of the return to drought and the water level of the open water level (SV open) to the electrode rod 1423 to be connected, the water level of the closed water level (SV closed) to the electrode rod 1424 connected to the terminal E12, and the electrode connected to the terminal E11. Assign a full water level to the rod 1425.

Then, the control unit 40 detects a drought state, an open water level state, a closed water level state, and a full water level state as the water level state based on the first detection condition. Specifically, as shown by arrow 1431, the control unit 40 sets the drought state below the drought water level at which there is no continuity between the common electrode rod 1421 and the electrode rod 1422, and lights L2 of the operation panel 44 for water tank control. The water supply control of the pump 20 is interrupted and abnormally stopped. Then, as shown by arrow 1431, after the drought is detected, the drought state is released at the drought return water level or higher at which the common electrode rod 1421 and the electrode rod 1423 are conductive, the L2 of the operation panel 44 is turned off, and the water supply control of the pump 20 is performed. Return the operation. Further, as shown by the arrow 1432, the control unit 40 sets the water open level below the open water level at which there is no continuity between the common electrode rod 1421 and the electrode rod 1423, and sends a signal to open the city water inflow valve 232 as a water receiving tank control. It outputs a signal to close the city water inflow valve 232 by setting the water level to the closed water level or higher at which the common electrode rod 1421 and the electrode rod 1424 are conductive after the open water level state. Then, as shown by arrow 1433, the water is filled at a level above the full water level at which the common electrode rod 1421 and the electrode rod 1425 are conductive, and at a water level below the full water level at which there is no continuity between the common electrode rod 1421 and the electrode rod 1425. Return from.

Here, even though the water level of the water receiving tank 210 is equal to or higher than the water level for returning to drought, the electrode rod 1422 assigned to the drought water level is dropped from the water level gauge 1420, and the control unit 40 is set to the common electrode rod. If the continuity between the 1421 and the electrode rod 1422 cannot be detected, a contradictory water level state in which the drought level or lower and the drought recovery level or higher are detected will occur. Therefore, the control unit 40 determines that the abnormal water level state (step S1020; Yes), and switches the water level level detection condition from the first detection condition to the second detection condition (step S1030). Next, an example of the second detection condition is shown in FIG. 12 (B).

In the water level gauge 1420 having five electrodes shown in FIG. 12B, as the second detection condition, the control unit 40 uses the electrode rod 1421 as a common electrode rod 1423 to detect the water level next to the electrode rod 1422. The drought water level and the open water level are assigned to the electrode rod 1424, the drought return water level and the closed water level are assigned to the electrode rod 1424, and the full water level is assigned to the electrode rod 1425.

Then, the control unit 40 detects a drought state, a reduced water state, and a full water state as the water level state based on the second detection condition. Specifically, as shown by arrow 1441, the control unit 40 makes the drought state below the drought water level where there is no continuity between the common electrode rod 1421 and the electrode rod 1423, and lights L2 of the operation panel 44 for water tank control. The water supply control of the pump 20 is interrupted and abnormally stopped. Then, as shown by the arrow 1441, the drought state is released at the drought return water level or higher at which the common electrode rod 1421 and the electrode rod 1424 are conducted after the drought is detected, the L2 of the operation panel 44 is turned off, and the water supply control of the pump 20 is performed. To restore the operation by. Further, as shown by the arrow 1442, the control unit 40 outputs a signal for opening the city water inflow valve 232 by setting the water level to an open level below the closed water level where there is no continuity between the common electrode rod 1421 and the electrode rod 1423. After the open water level state, the common electrode rod 1421 and the electrode rod 1424 are connected to each other at the closed water level or higher, and the closed water level state is set, and a signal for closing the city water inflow valve 232 is output. Then, as shown by arrow 1443, the common electrode rod 1421 and the electrode rod 1425 are filled with water above the conductive full water level, and the common electrode rod 1421 and the electrode rod 1425 are not connected with each other and are filled with water below the full water level. To cancel.

In the present embodiment, when the electrode rod 1422 for detecting the drought water level becomes abnormal, the drought water level is assigned to the electrode rod 1423 for detecting the next highest water level instead of the electrode rod 1422. In one embodiment, if the electrode rod 1422 that detects the drought water level becomes abnormal, a drought water level may be assigned to the electrode rods 1424 and 1425 that detect a higher water level instead of the electrode rod 1422.

In this way, when the electrode rod 1422 that detects the drought water level becomes abnormal, the water level of the receiving tank can be raised by assigning the drought water level to the electrode rod 1323 that detects a higher water level instead of the electrode rod 1422. The pump 20 is automatically operated only when the water level is above a predetermined level. As a result, water supply can be continued while preventing the pump 20 from running idle. In addition, the water receiving tank control can be continued by using an electrode rod different from the electrode rod in which the water level level is not normally detected.

The water level gauge 1520 shown in FIG. 13 detects the water level with five electrode rods 1521-1525. FIG. 13 (A) shows the water level level under the first detection condition, and FIG. 13 (B) shows the water level level under the second detection condition. In one embodiment, in the water supply facility 1000, the water level gauge 1520 shown in FIG. 13 is used instead of the water level gauge 1120.

As shown in FIG. 13 (A), the water level gauge 1520 has five electrode rods 1521-1525. As the first detection condition, the control unit 40 uses the electrode rod 1521 connected to the common terminal E15 of the I / O unit 47 as a common, the electrode rod 1522 connected to the terminal E14, the drought water level, and the terminal E13. Water level level for recovery from drought, water level for reduced water and water level for open water level (SV open) to electrode rod 1523 connected, water level level for closed water level (SV closed) to electrode rod 1424 connected to terminal E12, terminal E11 Assign a full water level to the electrode rod 1525 connected to.

Then, the control unit 40 detects a drought state, a reduced water state, an open water level state, a closed water level state, and a full water level state as the water level state based on the first detection condition. Specifically, as shown by the arrow 1531, the control unit 40 sets the drought state below the drought water level where there is no continuity between the common electrode rod 1521 and the electrode rod 1522, and lights L2 of the operation panel 44 for water tank control. The water supply control of the pump 20 is interrupted and abnormally stopped. Then, as shown by the arrow 1531, the drought state is released at the drought return water level or higher at which the common electrode rod 1521 and the electrode rod 1523 are conducted after the drought is detected, the L2 of the operation panel 44 is turned off, and the water supply control of the pump 20 is performed. To restore the operation by. Further, as shown by the arrow 1532, the control unit 40 sets the water level to less than the water level at which there is no continuity between the electrode rod 1521 and the electrode rod 1523. The water-reduced state is detected when a predetermined condition is satisfied, such as a state in which there is no continuity between the electrode rod 1521 and the electrode rod 1523 for a predetermined time or longer, and the water-reduced water level is equal to or higher than the conducted water level between the electrode rod 1521 and the electrode rod 1523. It should be canceled with. Further, as shown by arrow 1533, a signal is output to open the city water inflow valve 232 when the water level is below the open water level where there is no continuity between the common electrode rod 1521 and the electrode rod 1523, and after the open water level state. A signal for closing the city water inflow valve 232 is output when the water level is set to the closed water level or higher when the common electrode rod 1521 and the electrode rod 1524 are conducted. Then, as shown by the arrow 1534, the common electrode rod 1521 and the electrode rod 1525 are filled with water above the conductive full water level, and the common electrode rod 1521 and the electrode rod 1525 are filled with water below the full water level without continuity. To cancel.

Here, even though the water level of the water receiving tank 210 is equal to or higher than the water level for returning to drought, the electrode rod 1522 to which the drought water level is assigned falls from the water level gauge 1520, and the control unit 40 uses the common electrode rod. If the continuity between the 1521 and the electrode rod 1522 cannot be detected, the water level will be inconsistent below the drought level and above the drought recovery level. Therefore, the control unit 40 determines that the abnormal water level state (step S1020; Yes), and switches the water level level detection condition from the first detection condition to the second detection condition (step S1030). Next, an example of the second detection condition is shown in FIG. 13 (B).

In the water level gauge 1520 having five electrodes shown in FIG. 13B, as the second detection condition, the control unit 40 uses the electrode rod 1521 as a common electrode rod 1523 and detects the water level next to the electrode rod 1522. The drought water level, the reduced water level, the open water level, the electrode rod 1524 are assigned the drought return water level and the closed water level, and the electrode rod 1525 is assigned the full water level.

Then, the control unit 40 detects a drought state, a reduced water state, an open water level state, a closed water level state, and a full water level state as the water level state based on the second detection condition. Specifically, as shown by the arrow 1541, the control unit 40 sets the drought state below the drought water level where there is no continuity between the common electrode rod 1521 and the electrode rod 1523, and lights L2 of the operation panel 44 for water tank control. The water supply control of the pump 20 is interrupted and abnormally stopped. Then, as shown by arrow 1541, at the drought return water level or higher at which the common electrode rod 1521 and the electrode rod 1524 are conductive after the drought is detected, the drought state is released, L2 of the operation panel 44 is turned off, and the water supply of the pump 20 is performed. Restore controlled operation. Further, as shown by the arrow 1542, the control unit 40 is in a water-reduced state below the water-reduced water level at which there is no continuity between the electrode rod 1521 and the electrode rod 1523, and is equal to or higher than the water-reduced water level at which the electrode rod 1521 and the electrode rod 1523 are electrically connected. Release the reduced water state with. Further, as shown by arrow 1543, a signal is output to open the city water inflow valve 232 when the water level is below the open water level where there is no continuity between the common electrode rod 1521 and the electrode rod 1523, and after the open water level state. A signal for closing the city water inflow valve 232 is output when the water level is set to the closed water level or higher when the common electrode rod 1521 and the electrode rod 1524 are conducted. Then, as shown by the arrow 1544, the common electrode rod 1521 and the electrode rod 1525 are filled with water above the conductive full water level, and the common electrode rod 1521 and the electrode rod 1525 are filled with water below the full water level without continuity. To cancel.

In the present embodiment, when the electrode rod 1522 for detecting the drought water level becomes abnormal, the drought water level is assigned to the electrode rod 1523 for detecting the next highest water level instead of the electrode rod 1522. In one embodiment, if the electrode rod 1522 that detects the drought water level becomes abnormal, the drought water level may be assigned to the electrode rods 1524 and 1525 that detect a higher water level instead of the electrode rod 1522.

In this way, when the electrode rod 1522 for detecting the drought water level becomes abnormal, the pump 20 is automatically operated only when the water level in the water receiving tank is at or above a predetermined level. As a result, water supply can be continued while preventing the pump 20 from running idle. Further, by assigning the drought water level to the electrode rod 1523 that detects a higher water level instead of the abnormal electrode rod 1522, the water receiving tank is controlled by using an electrode rod different from the electrode rod in which the water level level is not normally detected. Can be continued.

In the example shown in FIG. 13, under the second detection condition, the electrode rod 1523 also detects three water level levels of a drought state, a reduced water state, and an open water level, and the electrode rod 1524 has two water level levels, a drought recovery state and a closed water level. Also serves as water level detection. In one embodiment, under the second detection condition, the electrode rod 1523 also detects the two water level levels of the drought state and the open water level, and the electrode rod 1524 also detects the three water level levels of the drought recovery, the reduced water level, and the closed water level. You may.

Here, under the second detection condition shown in FIG. 10B, the electrode rod 1223 also detects two water level levels, drought and drought recovery. Under the second detection condition shown in FIG. 12B, the electrode rod 1423 also detects two water level levels, a drought state and an open water level. Under the second detection condition shown in FIG. 13B, the electrode rod 1523 also detects three water level levels: a drought state, a reduced water state, and an open water level. In this way, when detecting a plurality of water level levels with one electrode rod, a detection timer for detecting at least one water level state may be used, or a detection timer may be used at a different set time for each water level level. May be good. As a result, the timing at which a plurality of water level levels are detected can be shifted, and it is possible to prevent the control by the control unit 40 from being excessively changed.

Further, when the water level levels of the drought and the open water level are detected by one electrode rod, the set time of the detection timer for detecting the drought state may be longer than the set time of the detection timer for detecting the open water level state. As a result, if the water level of the water receiving tank 210 rises as a result of the water flowing in from the city water inflow valve 232 in the open water level state, the drought state can be avoided. Therefore, abnormal stoppage of the pump 20 due to a drought state can be reduced.

In this way, by assigning the drought water level to the electrode rod that detects a higher water level instead of the abnormal electrode rod and controlling the water tank, an electrode rod different from the electrode rod whose water level level is not normally detected can be obtained. It can be used to continue water tank control. That is, the water supply device 10 inputs the drought water level of the receiving tank 210 and the water level signal of the water level gauge 1120 that detects a predetermined water level higher than the drought water level, and the control unit 40 is below the drought water level. When the water level signal (drought state) and the water level signal above the predetermined water level level above the drought state are input, it is judged that some abnormality has occurred in the water level signal, and the pump 20 is not forcibly stopped due to the drought state. Continue water supply by the pump 20. As a result, it is possible to avoid water interruption to the water supply destination.

In addition, normally, in any water level gauge, the water level of the water receiving tank 210 fluctuates from a water level below the full water level to a water level above the drought water level. Therefore, assuming that the predetermined water level below the full water level under the first detection condition is the normal water level level Lv, it is shown in FIGS. 10 (B), 11 (B), 12 (B), and 13 (B). As described above, under the second detection condition, the electrode rod may be assigned so that the drought level and the drought recovery level are detected at a water level equal to or lower than the water level level Lv.

Under the second detection condition described above, the control unit 40 determines whether or not the pump 20 is in idle operation based on the discharge pressure and / or the discharge flow rate while the pump 20 is being operated by water supply control. If it is determined that the operation is idle, the pump 20 is abnormally stopped. Specifically, the control unit 40 has a predetermined pressure (for example,) in which the discharge pressure is smaller than the target pressure while the pump 20 is operating under water supply control (for example, the rotation speed of the pump 20 is 98% or more of the rating). , 80% of the target pressure) or less, and / or if the state of the insufficient flow rate or less by the flow switch 24 continues for a predetermined idle operation detection time (for example, 10 seconds) or more, it is determined that the pump 20 is in idle operation, and the pump 20 is abnormal. Stop. Under the second detection condition, the water level may not be detected correctly. Therefore, if the discharge pressure is abnormally lowered with respect to the rotation speed of the pump 20 for a predetermined time, the control unit 40 will move the water receiving tank. It is advisable to determine that the water in 210 is exhausted and the pump 20 is idle, and to stop the pump 20 abnormally. The control unit 40 may also detect idle operation under the first detection condition. In that case, since the water level detection condition is changed under the second detection condition, the control unit 40 sets the idle operation detection time under the second detection condition from the idle operation detection time under the first detection condition. Should also be shortened.

In this embodiment, it was determined that the water level was abnormal due to the contradiction of the water level detected by the water level gauge. However, the water level of the water receiving tank 210 usually changes above the drought water level and below the full water level. Therefore, in one embodiment, when the drought water level cannot be detected, the abnormal water level may be determined. That is, for example, when the water level of the water receiving tank 210 is lower than the drought water level, the abnormal water level may be considered, and when the electrode rod for detecting the drought water level is defective or abnormal, in other words. If the water level of the electrode rod that detects the water level of drought cannot be detected normally, the water level may be abnormal.

Further, in the present embodiment, when the water level of the electrode rod for detecting the drought water level cannot be detected, it is regarded as an abnormal water level state, and the drought is detected by the electrode rod for detecting the water level next to the drought. In one embodiment, even in the electrode rod that detects a water level level other than drought among a plurality of water level levels, if the control unit 40 determines that the water level level cannot be normally detected under the first detection condition, the second Under the detection conditions of, instead of the electrode rod that cannot detect the water level, an electrode rod for detecting the next lowest water level or the next highest water level may be assigned to the water level. As a result, the water receiving tank control can be continued. The water receiving tank control under the second detection condition described above is an example, and the water receiving tank control regarding the display of the operation panel 44 and the like is the same as the water level state under the first condition even under the second detection condition. Therefore, under the second detection condition, only the forced stop control of the pump 20 due to the drought state may be performed. As a result, it is possible to notify the electrode rod in an abnormal state while continuing the water supply by the pump 20.

Further, in the water supply equipment of FIGS. 1A and 5, when an abnormality occurs in either the first water level gauge or the second water level gauge, the control unit 40 receives the water tank based on the water level signal of the other water level gauge. Take control. Here, in the water supply equipment of FIGS. 1A and 5, if the control unit 40 determines that the abnormal water level is in the abnormal water level state by the water level gauge in which the abnormality has occurred and / or the other water level gauge, the abnormality is performed according to the flow shown in FIG. It is preferable to change the water level level detection condition of the water level gauge determined to be in the water level state from the first detection condition to the second detection condition. For example, when the control unit 40 controls the water receiving tank based on the water level signal of the first water level gauge or the second water level gauge, if it determines that the water level is abnormal, the water level level detection condition is set to the first detection condition. To the second detection condition. Then, if an abnormality occurs in the water level gauge even when the water level level detection condition is the second detection condition, the water receiving tank is controlled based on the water level signal of the other water level gauge. As another example, when the control unit 40 controls the water receiving tank based on the water level signal of the first water level gauge or the second water level gauge, if an abnormality occurs in the water level gauge, the other water level gauge is used. The water receiving tank is controlled based on the water level signal of. Then, when the switched water level gauge determines that the water level is abnormal, the water level level detection condition is changed from the first detection condition to the second detection condition.
As a result, the water level gauge determined to be in an abnormal water level state is changed to the second detection condition so that the water supply control can be continued, and when an abnormality occurs in one water level gauge, the water level of the other water level gauge. The water level can be detected based on the signal.

(Third Embodiment)
FIG. 14 is a diagram showing an example of a water supply facility according to a third embodiment. The water supply equipment 2000 of the present embodiment uses the water supply device 10 having the same configuration as that of the above-described embodiment of FIG. 1A in an elevated water tank system.

In the present embodiment, the water supply device 10 communicates with the suction port of the water supply main 2100 or a water receiving tank (not shown), and the conveyed liquid sent by the pump 20 is an elevated water tank installed on the roof of the building 500. Water is stored in 2210, and is supplied to a water supply target (for example, a faucet) 501 in the building 500 by falling water from the elevated water tank 2210. A constant water level valve 2232 is provided in the water supply pipe 107 at the discharge port of the water supply device 10. The constant water level valve 2232 is a valve capable of shielding the flow path of the water supply pipe 107, and is controlled to open and close so that the water level of the elevated water tank 2210 is within a certain range (more than reduced water in the elevated water tank and less than full). For example, the constant water level valve 2232 is composed of a solenoid valve, and is controlled to open and close by an output signal from the control unit 40 (I / O unit 47) of the elevated water tank type water supply device 10. The constant water level valve 2232 may be opened and closed without going through the control unit 40.

The control unit 40 controls the water supply to the pump 20 in the elevated water tank system. Specifically, when the constant water level valve 2232 is opened, the discharge pressure drops and the pump 20 starts. Then, when the constant water level valve 2232 is closed, the control unit 40 detects with the flow switch 24 that the discharge flow rate of the pump 20 has reached less than the underwater amount Qmin, and stops the pump 20 with a small amount of water. If the constant water level valve 2232 is not closed even if the water level of the elevated water tank 2210 rises above the closed level after the pump 20 is started, the water in the elevated water tank 2210 overflows and the residence of the building 500. It causes secondary damage to such things. Therefore, the control unit 40 may forcibly stop the pump 20 when the water level is full.

Further, the control unit 40 determines the water level state of the water level of the elevated water tank 2210 based on the signal of the water level gauge 2120, and executes control (water tank control) based on the determined water level state. The control includes opening / closing control of the constant water level valve 2232, starting the pump 20 by opening the constant water level valve or reducing the water level, forcibly stopping the pump 20 when the water level is full, and water level (water reduction, localization) to the operation panel 44, the external terminal 80, or the like. It includes at least one of the display of water level valve open / closed (full water) and external output such as constant water level valve 2232 open / close signal and water level alarm.

Also in the present embodiment, as in the second embodiment, the control unit 40 detects the water level state of the water level of the elevated water tank 2210 based on the predetermined water level detection condition, and the detected water level state is predetermined. If it is determined that the water level is abnormal, the water level level detection condition is changed from the first detection condition to the second detection condition. Further, under the second detection condition, the control unit 40 may control the water supply of the pump 20 while notifying the alarm. By doing so, the user can easily recognize that the abnormal water level state is detected and the water level level detection condition is changed to the second detection condition, and the maintenance or replacement of the water level gauge 2120 is promoted. be able to.

15A to 15F are diagrams showing an example of the water level gauge 2120 used in the elevated water tank system. The arrows in the figure indicate the detection conditions of the water level state at each water level, and the same reference numerals are given to the equivalent detection conditions, and the description thereof will be omitted. The control unit 40 provides common terminals E15 and E33 and input terminals E11 to E14, E31 and E32 for inputting signals of the respective electrode rods as terminals for inputting the signal of the electrode type level switch to the I / O unit 47. Have. Further, in FIGS. 15A to 15F, the electrode rod is directly connected to the I / O portion 47, but the electrode rod may be connected to the I / O portion 47 via a cable or the like, or the water level gauge 2120. The detection signal in the above may be transmitted to the I / O unit 47 by any wireless or wired communication.

The water level gauge 2120 is an electrode type level switch, and the water level is detected by five electrode rods 2121 to 2125. 15A shows the water level level under the first detection condition, and FIGS. 15B to 15F show the water level level under the second detection condition.

As shown in FIG. 15A, as the first detection condition, the control unit 40 uses the electrode rod 2121 connected to the common terminal E15 as a common, and the water level of the elevated water tank reduced water level on the electrode rod 2122 connected to the terminal E14. The electrode rod 2123 connected to the terminal E13 has the water level of the constant water level valve open level, the electrode rod 2124 connected to the terminal E12 has the water level of the constant water level valve closed, and the electrode rod 2124 connected to the terminal E11 is full. Assign a water level of.

Then, the control unit 40 detects the elevated water tank low water level state, the open water level state, the closed water level state, and the full water level state as the water level state based on the first detection condition. Specifically, as shown by the arrow 2131, the control unit 40 sets the water in the elevated water tank to be in a low water level below the low water level where there is no continuity between the common electrode rod 2121 and the electrode rod 2122, and notifies the operation panel 44 of the common. The water-reduced state of the elevated water tank is released when the water-reduced water level at which the electrode rod 2121 and the electrode rod 2122 are conductive or higher. As shown by the arrow 2132, the open water level state is detected below the constant water level valve open water level level where there is no continuity between the common electrode rod 2121 and the electrode rod 2123. As water tank control, the control unit 40 may output a contact signal for opening the constant water level valve 2232 when the open water level state is detected. As shown by the arrow 2132, the closed water level state is detected at the closed water level or higher at which the common electrode rod 2121 and the electrode rod 2124 are conducted after the open water level state. When the control unit 40 detects the closed water level state, the control unit 40 outputs a contact signal for closing the constant water level valve 2232. As shown by the arrow 2133, the common electrode rod 2121 and the electrode rod 2125 are filled with water above the conductive full water level, and the common electrode rod 2121 and the electrode rod 2125 are released from the full water level below the non-conducting full water level. To do. When the control unit 40 detects a full water state, the operation panel 44 may notify the control unit 40 and forcibly stop the pump 20. As a result, it is possible to prevent the water in the 2210 in the elevated water tank from overflowing. If the water level of the elevated water tank 2210 is less than the full water level, the control unit 40 controls the water supply of the pump 20.

Here, when the water level of the elevated water tank 2210 becomes a contradictory water level state, the control unit 40 determines that the water level is in an abnormal water level state (step S1020; Yes), and determines the water level level detection condition from the first detection condition to the second detection condition. Switch to the condition (step S1030). Next, an example of the second detection condition is shown in FIGS. 15B to 15F.

FIG. 15B shows an example of the second detection condition when the water level of the electrode rod 2122 cannot be detected normally. As the second detection condition shown in FIG. 15B, the control unit 40 assigns the electrode rod 2121 to the common and assigns the water level of the elevated water tank to the water level of the elevated water tank and the water level of the closed water level to the electrode rod 2123 which detects the water level next to the electrode rod 2122. , The electrode rod 2124 is assigned a closed water level, and the electrode rod 2125 is assigned a full water level. Then, the control unit 40 detects the water level state indicated by the arrow 2134 instead of the arrow 2131. Specifically, the water tank is lowered below the reduced water level where there is no continuity between the common electrode rod 2121 and the electrode rod 2123, and the elevated water tank is above the reduced water level where the common electrode rod 2121 and the electrode rod 2123 are conductive. Release the low water state.

FIG. 15C shows an example of the second detection condition when the water level of the electrode rod 2123 cannot be detected normally. As the second detection condition shown in FIG. 15C, the control unit 40 uses the electrode rod 2121 as a common, reduces the water in the elevated water tank to the electrode rod 2122, and sets the water level to the electrode rod 2124 that detects the next lowest water level after the electrode rod 1223. A closed water level and a full water level are assigned to the electrode rods 2125. Then, the control unit 40 detects the water level state indicated by the arrow 2135 instead of the arrow 2132. Specifically, as shown by arrow 2135, the open water level state is detected below the constant water level valve open water level where there is no continuity between the common electrode rod 2121 and the electrode rod 2124, and after the open water level state, the common electrode rod 2121 is detected. The closed water level state is detected above the closed water level at which the electrode rod 2124 and the electrode rod 2124 are electrically connected.

FIG. 15D shows an example of the second detection condition when the water level of the electrode rod 2124 cannot be detected normally. As the second detection condition shown in FIG. 15D, the control unit 40 detects the electrode rod 2121 as a common, the water reduction in the elevated water tank on the electrode rod 2122, the open water level on the electrode rod 2123, and the water level next to the electrode rod 2124. The closed water level is assigned to the electrode rod 2123, and the full water level is assigned to the electrode rod 2125. Then, the control unit 40 detects the water level state indicated by the arrow 2136 instead of the arrow 2132. Specifically, as shown by arrow 2136, the open water level state is detected below the constant water level valve open water level where there is no continuity between the common electrode rod 2121 and the electrode rod 2123, and after the open water level state, the common electrode rod 2121 is detected. The closed water level state is detected above the closed water level at which the electrode rod 2123 and the electrode rod 2123 are electrically connected.

FIG. 15E shows an example of the second detection condition when the water level of the electrode rod 2125 cannot be detected normally. As the second detection condition shown in FIG. 15E, the control unit 40 has the electrode rod 2121 as a common, the electrode rod 2122 has a water tank reduced, the electrode rod 2123 has an open water level, the electrode rod 2124 has a closed water level, and the electrode rod 2125. Next, a full water level is assigned to the electrode rod 2124 that detects the low water level. Then, the control unit 40 detects the water level state indicated by the arrow 2137 instead of the arrow 2133. Specifically, as shown by arrow 2137, the full water level is detected above the full water level at which the common electrode rod 2121 and the electrode rod 2124 are conductive, and the water level is lower than the full water level at which the common electrode rod 2121 and the electrode rod 2124 are not conductive. Release the full state with.

FIG. 15F shows another example of the second detection condition when the water level of the electrode rod 2125 cannot be detected normally. As the second detection condition shown in FIG. 15F, the control unit 40 uses the electrode rod 2121 as a common, the water in the elevated water tank is reduced on the electrode rod 2122, the open and closed water levels are on the electrode rod 1223, and the water level is the second lowest after the electrode rod 2125. A full water level is assigned to the electrode rod 2124 to detect. Then, the control unit 40 detects the water level state indicated by the arrow 2138 instead of the arrow 2132. Specifically, as shown by arrow 2138, the open state is detected below the open water level of the constant water level valve where there is no continuity between the common electrode rod 2121 and the electrode rod 2123, and the common electrode rod 2121 and the electrode rod 2123 are conductive. Water level valve Closed When the water level is higher than the water level. Further, instead of the arrow 2133, the water level state indicated by the arrow 2139 is detected. Specifically, as shown by arrow 2139, the full water level is detected above the full water level at which the common electrode rod 2121 and the electrode rod 2124 are conductive, and the water level is lower than the full water level at which the common electrode rod 2121 and the electrode rod 2124 are not conductive. Release the full state with.

Then, the control unit 40 detects the elevated water tank low water state, open state, closed state, and full water state as the water level state based on the second detection condition.

In this way, when the control unit 40 determines that the water level level cannot be detected normally under the first detection condition, the control unit 40 replaces the electrode rod whose water level level cannot be detected under the second detection condition with the next lowest water level. Alternatively, an electrode rod for detecting the next highest water level may be assigned to the water level to detect the water level state. As a result, the control unit 40 can continue the water tank control.
Further, in the present embodiment, when the electrode rod 2125 for detecting the full water level is abnormal under the first detection condition, the next lowest water level is detected instead of the electrode rod 2125 under the second detection condition. A full water level was assigned to the electrode rod 2124. In one embodiment, when the electrode rod 1322 that detects the full water level becomes abnormal, the water level of the electrode rod 2122, 2123 that detects a lower water level is replaced with the electrode rod that has become higher than that. May be assigned. In this way, when the electrode rod 2125 that detects the full water level becomes abnormal, the water level of the elevated water tank 2210 is assigned by assigning the full water level to the electrode rod that detects the lower water level instead of the electrode rod 2125. The pump 20 is forcibly stopped only when the water level is above a predetermined level. As a result, water supply can be continued while preventing the elevated water tank 2210 from overflowing.

Here, under the second detection conditions shown in FIGS. 15B to 15F, a plurality of water level levels are detected with one electrode rod as in the second embodiment. In this case as well, a detection timer for detecting at least one water level state may be used, or a detection timer may be used at a set time different for each water level state. As a result, the timing at which a plurality of water level levels are detected can be shifted, and it is possible to prevent the control by the control unit 40 from being excessively changed.

(Modification 1 of the third embodiment)
FIG. 16 is a diagram showing a modified example of the water supply facility according to the third embodiment. In the water supply equipment 3000 of this modified example, the water supply device 10 is used in the elevated water tank system as in the water supply equipment 2000. The elevated water tank 3110A (first water tank) and the elevated water tank 3110B (second water tank) are provided as the elevated water tank.

Water sent to the elevated water tank 3110A and the elevated water tank 3110B by the water supply device 10 by the inflow pipes 3130A (first inflow pipe) and 3130B (second inflow pipe) branched from the water supply pipe 107 of the water supply device 10. Is stored. Valves 3132A and 3132B are provided in each of the inflow pipes 3130A and 3130B, respectively. The valves 3132A and 3132B are valves that can shield the flow path of the inflow pipes 3130A and 3130B, and are composed of, for example, an electromagnetic valve, and are controlled by an output signal from the I / O unit 47 of the water supply device 10.

On the downstream side of the elevated water tanks 3110A and 3110B, sluice valves 3118A and 3118B that can be opened and closed manually are provided. Further, the elevated water tanks 3110A and 3110B may be connected to each other by a communication pipe provided with a water stop valve 3114.

Each of the elevated water tanks 3110A and 3110B is provided with a first water level meter 3120A and a second water level meter 3120B, which are electrode-type level switches for detecting the water level in the water tank. The first water level gauge 3120A and the second water level gauge 3120B have the same functions as the above-mentioned water level gauge 2120.

In the water supply facility 3000, the control unit 40 controls the water tank based on the water level signal of the other water level gauge when an abnormality occurs in either the first water level gauge or the second water level gauge. Further, when the control unit 40 determines that the abnormal water level is in the abnormal water level by the water level gauge in which the abnormality has occurred and / or the other water level gauge, the water level gauge in which the abnormal water level is determined is determined according to the flow shown in FIG. The water level level detection condition may be changed from the first detection condition to the second detection condition. For example, the control unit 40 sets the water level level detection condition of the water level gauge, which is determined to be an abnormal water level state, as the first water level detection condition when the water tank is controlled based on the water level signal of the first water level gauge or the second water level gauge. The detection condition is changed to the second detection condition. If an abnormality occurs in the water level gauge even when the water level level detection condition is the second detection condition, the water tank is controlled based on the water level signal of the other water level gauge. As another example, when the control unit 40 controls the water tank based on the water level signal of the first water level gauge or the second water level gauge, if an abnormality occurs in the water level gauge, the other water level gauge is used. The water tank is controlled based on the water level signal. Then, when the switched water level gauge determines that the water level is abnormal, the water level level detection condition is changed from the first detection condition to the second detection condition.
As a result, the water level gauge determined to be in an abnormal water level state is changed to the second detection condition so that water supply control can be continued, and when an abnormality occurs in one water level gauge, the other water level gauge is used. The water level can be detected based on the water level signal of.

(Modification 2 of the third embodiment)
FIG. 17 is a diagram showing another modification of the water supply facility according to the third embodiment. In the water supply equipment 4000 of this modification, the water supply device 10 is used in the elevated water tank system as in the water supply equipment 2000.

The elevated water tank 2210 is provided with a first water level meter 4120A and a second water level meter 4120B, which are electrode-type level switches for detecting the water level in the water tank. The first water level gauge 4120A and the second water level gauge 4120B have the same functions as the above-mentioned water level gauge 2120, respectively.

In the water supply facility 4000, when an abnormality occurs in either the first water level gauge 4120A or the second water level gauge 4120B, the control unit 40 controls the water tank based on the water level signal of the other water level gauge. When the control unit 40 determines that the abnormal water level is in the abnormal water level by the water level gauge in which the abnormality has occurred and / or the other water level gauge, the water level level of the water level gauge determined to be in the abnormal water level according to the flow shown in FIG. The detection condition may be changed from the first detection condition to the second detection condition. For example, when the control unit 40 controls the water tank based on the water level signal of the first water level gauge 4120A or the second water level gauge 4120B, if it determines that the water level is abnormal, the control unit 40 sets the water level level detection condition of the water level gauge. The detection condition of 1 is changed to the second detection condition. If an abnormality occurs in the water level gauge even when the water level level detection condition is the second detection condition, the water tank is controlled based on the water level signal of the other water level gauge. As another example, when the control unit 40 controls the water tank based on the water level signal of the first water level gauge or the second water level gauge, if an abnormality occurs in the water level gauge, the other water level gauge is used. The water tank is controlled based on the water level signal. Then, when the switched water level gauge determines that the water level is abnormal, the water level level detection condition is changed from the first detection condition to the second detection condition.
As a result, the water level gauge determined to be in an abnormal water level state is changed to the second detection condition so that the water supply control can be continued, and when an abnormality occurs in one water level gauge, the water level of the other water level gauge. The water level can be detected based on the signal.

The present embodiment described above can also be described as the following embodiment. [Form 1] According to Form 1, a water supply device having a pump and for supplying a transport liquid to a water supply destination is proposed. The water supply device includes a control unit that controls the water tank based on a water level signal from a water level gauge provided in the water tank that stores the conveyed liquid, and the control unit controls the water level of the water tank based on a predetermined detection condition. When a state is detected and it is determined that the detected water level state is a predetermined abnormal water level state, the detection condition is changed from the first detection condition to the second detection condition. According to the first embodiment, when it is determined that the water level state is abnormal under the first detection condition, the detection condition of the water level state is changed from the first detection condition to the second detection condition. In this way, even if some abnormality occurs in the detection of the water level state of the water tank, the water supply can be continued by the water tank control in which the detection condition of the water level gauge is changed.

[Form 2] According to the second embodiment, in the first embodiment, the water level gauge is an electrode type level switch including a plurality of electrode rods, and the control unit is based on the detection conditions and the plurality of electrode rods. At least one water level of the water tank is assigned to the water level to detect the water level state of the water tank, and under the second detection condition, the abnormal water level state is determined under the first detection condition of the plurality of electrode rods. The water level is detected only by the electrode rods excluding the determined electrode rods. According to the second aspect, under the second detection condition, the water level level is detected only by the electrode rods excluding the electrode rods determined to be in the abnormal water level state under the first detection condition. As a result, even if some abnormality occurs in the water level detection by the electrode rod, the water supply can be continued by the water tank control in which the detection conditions are changed.

[Form 3] According to the third form, in the first or second form, the water level gauge is an electrode type level switch including a plurality of electrode rods, and the control unit is a plurality of electrode type level switches based on the detection conditions. A plurality of water level levels of the water tank are assigned to the electrode rods to detect the water level state of the water tank, and the water level level determined to be an abnormal water level state under the first detection condition is determined by the second detection condition. An electrode rod different from that of the first detection condition is assigned. According to the third embodiment, under the second detection condition, the water level level determined to be in the abnormal water level state under the first detection condition can be detected by using another electrode rod.

[Form 4] According to the fourth form, in the first to third forms, the detection condition returns from the second detection condition to the first detection condition by the external input of the alarm reset.

[Form 5] According to Form 5, in Forms 1 to 4, the water supply device is used in a water receiving tank system in which the liquid stored in the water tank is pressurized by a pump and supplied to the water supply destination, and the control unit is used. If the water level signal input from the water level gauge under the first detection condition detects that the water level signal is less than the drought water level, it is determined that the water level is abnormal. This is based on the fact that in the water receiving tank system, the water tank is usually controlled so as not to reach a drought state. Then, even if a drought is erroneously detected due to an abnormality in the water level gauge, water supply can be continued without forcibly stopping the pump.

[Form 6] According to Form 6, in Forms 1 to 4, the water supply device stores the transport liquid pressurized by the pump in the water tank, and supplies the stored transport liquid to the water supply destination. It is used in a water tank system, and is characterized in that if the water level signal input from the water level gauge detects a full water level or higher under the first detection condition, it is determined to be in the abnormal water level state. This is based on the fact that in the elevated water tank system, the water tank is usually controlled so as not to reach a full state. Then, even when the elevated water tank cannot be detected due to an abnormality in the water level gauge, it is possible to prevent the conveyed liquid from overflowing from the elevated water tank.

[Form 7] According to Form 7, in Forms 1 to 6, the pump that was forcibly stopped by the water tank control under the first detection condition is forced to stop by changing to the second detection condition. It is characterized by being released. This is based on the fact that the second detection condition is the water level condition for releasing the forced stop of the pump due to the abnormal water level state. As a result, the forced stop of the pump due to the abnormal water level state can be released and the water supply can be continued.

[Form 8] According to Form 8, in Forms 1 to 7, it is determined whether or not the pump is idle based on the discharge pressure and / or the discharge flow rate of the pump, and the detection is performed. If it is determined that the pump is idle when the condition is changed to the second detection condition, the pump is abnormally stopped. According to the eighth embodiment, it is possible to prevent the pump from continuing idle operation when the detection condition is changed to the second detection condition.

[Form 9] According to Form 9, when the predetermined operating state continues for the idle operation detection time based on the discharge pressure and / or the discharge flow rate of the pump in the pumps 1 to 7, the pump When it is determined that the pump is idle and the pump is abnormally stopped and the detection condition is changed to the second detection condition, the detection condition is higher than that when the detection condition is the first detection condition. The idle operation detection time is set to a short time. According to the ninth aspect, when the detection condition is changed to the second detection condition, it is possible to quickly determine that the pump is in idle operation and prevent the pump from continuing in idle operation.

[Form 10] According to Form 10, in Forms 1 to 9, the water level gauge is an electrode type level switch provided with a plurality of electrode rods, and the predetermined abnormal water level state is detected by the water level gauge. In the state where the water level level is inconsistent and the water level level detected by the water level gauge is inconsistent, at least one of the plurality of electrode rods is detected to be exposed from the water surface. At the same time, a state in which a part of the electrode rod that detects a water level higher than that of the exposed electrode rod is submerged is detected.

[Form 11] According to Form 11, in Forms 1 to 10, the water level gauge is an electrode type level switch provided with a plurality of electrode rods, and the predetermined abnormal water level state is detected by the water level gauge. In the state where the water level level is inconsistent and the water level level detected by the water level gauge is inconsistent, at least one of the plurality of electrode rods is detected to be submerged. At the same time, the electrode rod that detects a water level lower than the exposed electrode rod is in a state of detecting a state of being exposed from the water surface.

[Form 12] According to Form 12, in the first to eleventh forms, the control unit operates the pump under water supply control while notifying an alarm under the second detection condition. According to the morphology 12, the user can be made to recognize that the abnormal water level state is detected and the detection condition is changed to the second detection condition.

[Form 13] According to Form 13, in Forms 1 to 12, the control unit controls the water tank based on the water level signal of at least one of the plurality of water level meters that detect the water level of the water tank. Then, at least one of the plurality of water level gauges is used as a control sensor, and when a predetermined abnormality is detected by the control sensor, a change sensor which is a water level gauge different from the water level gauge that detects the abnormality is used. It is characterized in that the water level state of the water tank is detected. According to the thirteenth aspect, even when an abnormality occurs in one of the plurality of water level gauges, the water level state of the water tank can be detected based on the water level signal of another water level gauge, and the pump can be used. It is possible to suppress the abnormal stoppage of the water supply and continue the water supply.

[Form 14] According to Form 14, a water supply device for supplying a transport liquid to a water supply destination by a pump is proposed, and the water supply device pressurizes the liquid stored in the water tank by a pump and supplies the liquid to the water supply destination. Used in a water receiving tank system, the water supply device inputs a water level signal of a water level gauge that detects a drought water level of the water tank and a predetermined water level level higher than the drought water level, and supplies water to the pump. It has a control unit to control, and when the control unit inputs a water level signal below the drought water level and below the predetermined water level, the pump is forcibly stopped to be below the drought water level and above the predetermined water level. After inputting the water level signal of, the water supply control of the pump is continued. According to the fourteenth aspect, when an abnormality occurs in the detection of the drought water level, when a water level signal above a predetermined water level is input, the water supply control of the pump is continued, the forced stop of the pump is suppressed, and the water supply is continued. be able to. The predetermined water level may be the next lowest water level level after the drought water level level that can be detected by the water level gauge.

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 scope of 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 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 28 ... Pressure tank 40 ... Control unit 41 ... Storage unit 42 ... Calculation unit 44 ... Operation panel 45 ... Setting unit 46 ... Display unit 47 ... I / O unit (input / output unit)
48 ... Communication unit 80 ... External terminal 80A ... Display operation unit 110A ... Water receiving tank (first water receiving tank)
110B ... Water receiving tank (second water receiving tank)
112 ... Communication pipe 114 ... Water stop valve 118A, 118B ... Gate valve 120A ... Electrode type level switch (1st water level gauge)
120B ... Electrode type level switch (second water level gauge)
121-125 ... Electrode rod 130A ... Inflow pipe (first inflow pipe)
130B ... Inflow pipe (second inflow pipe)
132A ... City water inflow valve (1st city water inflow valve)
132B ... City water inflow valve (second city water inflow valve)
140A ... Float switch (1st water level gauge)
140B ... Float switch (second water level gauge)
210 ... Water receiving tank 300, 1000, 2000, 3000, 4000 ... Water supply equipment 1120, 1220, 1320, 1420, 1520, 2120 ... Water level gauge 2210, 3110A, 3110B ... Elevated water tank 3120A, 4120A ... Water level gauge (first water level gauge) )
3120B, 4120B ... Water level gauge (second water level gauge)

Claims (14)

A water supply device that has a pump and supplies the conveyed liquid to the water supply destination.
The water supply device
It is provided with a control unit that controls the water tank based on the water level signal from the water level gauge provided in the water tank that stores the conveyed liquid.
The control unit
When the water level state of the water tank is detected based on a predetermined detection condition and it is determined that the detected water level state is a predetermined abnormal water level state, the detection condition is changed from the first detection condition to the second detection condition. Characterized by
Water supply device. The water level gauge is an electrode type level switch provided with a plurality of electrode rods.
Based on the detection conditions, the control unit assigns at least one water level of the water tank to the plurality of electrode rods and detects the water level state of the water tank.
In the second detection condition, the water level is detected only by the electrode rods excluding the electrode rods determined to be in the abnormal water level state under the first detection condition among the plurality of electrode rods.
The water supply device according to claim 1. The water level gauge is an electrode type level switch provided with a plurality of electrode rods.
Based on the detection conditions, the control unit assigns a plurality of water level levels of the water tank to the plurality of electrode rods and detects the water level state of the water tank.
The water level level determined to be in the abnormal water level state under the first detection condition is assigned an electrode rod different from that of the first detection condition under the second detection condition.
The water supply device according to claim 1 or 2. The detection condition returns from the second detection condition to the first detection condition by an external input of alarm reset.
The water supply device according to any one of claims 1 to 3. The water supply device is used in a water receiving tank system in which the liquid stored in the water tank is pressurized by a pump and supplied to the water supply destination.
The control unit
If the water level signal input from the water level gauge under the first detection condition detects a drought water level below the water level, it is determined that the water level is abnormal.
The water supply device according to any one of claims 1 to 4. The water supply device is used in an elevated water tank system in which the transport liquid pressurized by the pump is stored in the water tank and the stored transport liquid is supplied to the water supply destination.
It is characterized in that, when the water level signal input from the water level gauge detects a full water level or higher under the first detection condition, it is determined that the water level is abnormal.
The water supply device according to any one of claims 1 to 4. The pump that has been forcibly stopped by the water tank control under the first detection condition is released from the forcible stop by changing to the second detection condition.
The water supply device according to any one of claims 1 to 6. The control unit
Based on the discharge pressure and / or the discharge flow rate of the pump, it is determined whether or not the pump is idle.
When it is determined that the pump is idle when the detection condition is changed to the second detection condition, the pump is abnormally stopped.
The water supply device according to any one of claims 1 to 7. The control unit
Based on the discharge pressure and / or the discharge flow rate of the pump, when the predetermined operation state continues for the idle operation detection time, it is determined that the pump is in idle operation and the pump is abnormally stopped.
When the detection condition is changed to the second detection condition, the idle operation detection time is set to be shorter than when the detection condition is the first detection condition.
The water supply device according to any one of claims 1 to 7. The water level gauge is an electrode type level switch provided with a plurality of electrode rods.
The predetermined abnormal water level state is a state in which the water level level detected by the water level gauge is inconsistent.
In the state where the water level level detected by the water level gauge is inconsistent, at the same time as detecting the state where at least one of the plurality of electrode rods is exposed from the water surface, the water level is higher than the exposed electrode rods. It is a state where a part of the electrode rod is submerged.
The water supply device according to any one of claims 1 to 9. The water level gauge is an electrode type level switch provided with a plurality of electrode rods.
The predetermined abnormal water level state is a state in which the water level level detected by the water level gauge is inconsistent.
In the state where the water level level detected by the water level gauge is inconsistent, at least one of the plurality of electrode rods is detected in the submerged state, and at the same time, the water level lower than the exposed electrode rod is detected. It is a state where the electrode rod to be exposed is detected to be exposed from the water surface.
The water supply device according to any one of claims 1 to 10. The control unit
It is characterized in that the pump is operated under water supply control while notifying an alarm under the second detection condition.
The water supply device according to any one of claims 1 to 11. The control unit
The water tank is controlled based on the water level signal of at least one of the plurality of water level gauges that detect the water level of the water tank.
At least one of the plurality of water level gauges is used as a control sensor.
When a predetermined abnormality is detected by the control sensor, the water level state of the water tank is detected by using a change sensor which is a water level gauge different from the water level gauge that detected the abnormality.
The water supply device according to any one of claims 1 to 12. A water supply device for supplying the conveyed liquid to the water supply destination with a pump.
The water supply device is used in a water receiving tank system in which the liquid stored in the water tank is pressurized by a pump and supplied to the water supply destination.
The water supply device has a control unit that inputs a water level signal of a water level gauge that detects a drought water level of the water tank and a predetermined water level higher than the drought water level, and controls water supply to the pump.
The control unit
When the water level signals below the drought water level and below the predetermined water level are input, the pump is forcibly stopped.
When a water level signal below the drought water level and above the predetermined water level is input, the water supply control of the pump is continued.
Water supply device.

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