Water treatment and water supply system

Abstract

To provide a water treatment and water supply system that can reduce the number of water level detection units in a water level detector. [Solution] The water treatment and water supply system 1 comprises a water treatment device that filters raw water and stores it in a receiving tank 16, a water supply device that replenishes and supplies water to the receiving tank 16 from an external source, a water level detector 19 having a plurality of water level detection units 19a that detect water levels for determining whether the water treatment device and the water supply device are operational, and a control device that determines whether at least two of the multiple operational feasibility settings for the water treatment device and the water supply device are operational based on at least one of the water levels detected by the plurality of water level detection units 19a.

Description

Technical Field

[0001] The present invention relates to a water treatment and water supply system that performs water treatment and water supply.

Background Art

[0002] Conventionally, there has been known a water treatment and water supply system including a water treatment apparatus that removes solid particles such as sand contained in raw water and components to be removed such as iron and manganese contained in water, and a water supply apparatus that supplies treated water after water treatment to a secondary side. As the treatment progresses, the filtration tank of a water treatment apparatus experiences reduction in treatment capacity and clogging, and thus a technique of performing backwashing operation using treated water or tap water is known (see, for example, Patent Document 1).

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] In the above-mentioned water treatment apparatus, a water receiving tank is arranged on the secondary side of the filtration tank, and water in the water receiving tank is used for water supply and backwashing. Therefore, it is necessary to detect water levels in the water receiving tank corresponding to full water, low water, ON and OFF of a raw water pump, ON and OFF of a backwashing pump, ON and OFF of a water supply pump, and opening and closing of a supply system valve for tap water or the like.

[0005] For this reason, when a common is included in a water level detector, the number of electrodes increases, and as a result, it is necessary to use three or more general water level detectors. As described above, since the number of water level detection parts such as electrodes for detecting water level increases in a water level detector, there is a demand for a technique that can reduce the number of water level detection parts.

[0006] Therefore, the present invention aims to provide a water treatment and water supply system that can reduce the number of water level detection units in a water level detector. [Means for solving the problem]

[0007] According to one aspect of the present invention, a water treatment and water supply system comprises: a water treatment device that filters raw water and stores it in a receiving tank; a water supply device that replenishes and supplies water to the receiving tank from an external source; a water level detector having a plurality of water level detection units that detect water levels at which a plurality of movable statuses can be determined for the water treatment device and the water supply device; and a control device that determines whether at least two of the plurality of movable statuses for the water treatment device and the water supply device can be determined for at least one of the water levels detected by the plurality of water level detection units. [Effects of the Invention]

[0008] This invention can provide a water treatment and water supply system that can reduce the number of water level detection units in a water level detector. [Brief explanation of the drawing]

[0009] [Figure 1] A schematic diagram illustrating the configuration of a water treatment and water supply system according to one embodiment of the present invention. [Figure 2] A schematic diagram illustrating the configuration of the water treatment and water supply system. [Figure 3] A schematic diagram illustrating the configuration of the water treatment and water supply system. [Figure 4] An explanatory diagram illustrating the water level detector of the example and the water level detector of the comparative example. [Figure 5] An explanatory diagram showing an example of the control process for the water treatment and supply system. [Figure 6] An explanatory diagram showing an example of the control process for the water treatment and supply system. [Figure 7] An explanatory diagram showing an example of the operation of each component of the water treatment and water supply system. [Figure 8] An explanatory diagram showing an example of a timetable for backwashing using the same water treatment and water supply system. [Figure 9]An explanatory diagram showing an example of turning the raw water pump ON and OFF in the same water treatment and water supply system. [Modes for carrying out the invention]

[0010] The configuration of the water treatment and water supply system 1 according to one embodiment of the present invention will be described below with reference to Figures 1 to 9. Figures 1 to 3 are explanatory diagrams that schematically show the configuration of the water treatment and water supply system 1. Figure 1 is an explanatory diagram showing an example of water flow during normal filtration. Figure 2 is an explanatory diagram showing an example of water flow during backwashing. Figure 3 is an explanatory diagram showing an example of water flow during water supply. In Figure 1, the water flow during normal filtration is shown by solid arrows, the water flow during water supply is shown by dashed-dotted arrows, and the water flow during replenishment is shown by double-dotted-dotted arrows. In Figure 2, the water flow during backwashing is shown by solid arrows, the water flow during water supply is shown by dashed-dotted arrows, and the water flow during replenishment is shown by double-dotted-dotted arrows. In Figure 3, the water flow during water supply is shown by solid arrows.

[0011] Figure 4 is an explanatory diagram showing the configuration and detected water level of an embodiment of a water level detector 19 used in a water treatment water supply system 1, and a comparative example of a water level detector 19 used in the conventional technology. Figure 5 is an explanatory diagram showing an example of the control process of the raw water pump 10, backwash pump 17, water supply pump 18, and replenishment system valve 20 of the water treatment water supply system 1. Figure 6 is an explanatory diagram showing an example of the control process of the water treatment water supply system. Figure 7 is an explanatory diagram showing an example of the operation of the water treatment water supply system 1 in relation to the water level. Figure 8 is an explanatory diagram showing an example of a timetable for backwashing treatment using the water treatment water supply system 1, and Figure 9 is an explanatory diagram showing an example of the ON and OFF of the raw water pump.

[0012] As shown in Figure 1, the water treatment and supply system 1 pumps raw water from a supply source such as a well, treats the raw water in a filtration tank 13, stores the treated water in a treated water tank 16, and then supplies it to the destination. Here, the treatment of raw water in the filtration tank 13 is performed by passing it through a filter material installed in the filtration tank 13. Various treatments of raw water in the filtration tank 13 include treatments to remove iron and manganese from the raw water by supplying sodium hypochlorite or the like to the raw water and filtering out iron and manganese, and treatments to filter out impurities such as solid particles such as sand from the raw water.

[0013] The water treatment and water supply system 1 is a device that includes a water treatment device and a water supply device. Specifically, the water treatment and water supply system 1 includes a raw water pump 10, an on-off valve 11, a first switching valve 12, a filtration tank 13, a second switching valve 14, a third switching valve 15, a treated water tank 16, a backwash pump 17, a water supply pump 18, a water level detector 19, a replenishment system valve 20, piping 21, and a control system 30. The water treatment and water supply system 1 may also include a sand filter, a chemical injection device, etc. In such a water treatment and water supply system 1, the raw water pump 10, on-off valve 11, first switching valve 12, filtration tank 13, second switching valve 14, third switching valve 15, and backwash pump 17, which are connected to the treated water tank 16 by piping 21, constitute the water treatment device. Furthermore, the water treatment and water supply system 1 comprises a water supply pump 18 and a replenishment system valve 20 connected to the treated water tank 16 by piping 21, which constitute the water supply device. The water treatment and water supply system 1 controls the water treatment and water supply device by determining whether at least two components of the water treatment device and water supply device are movable based on at least one of several water levels detected by the water level detector 19 using a control system 30.

[0014] The raw water pump 10 pumps raw water from a supply source such as a well and sends the raw water to the secondary side. The on-off valve 11 is installed between the raw water pump 10 and the first switching valve 12. The on-off valve 11 opens and closes the flow path based on a command signal from the control system 30.

[0015] The first switching valve 12 selectively connects the raw water pump 10, the filtration tank 13, and a backwash drainage destination (drain) that drains backwash water during backwashing. The first switching valve 12 is, for example, a three-way valve. The first switching valve 12 is configured to be switchable between the connection of the raw water pump 10 and the filtration tank 13, and the connection of the filtration tank 13 and the backwash drainage destination according to a command signal from the control system 30.

[0016] The filtration tank 13 accommodates a filter and a filter medium inside a cylindrical tank body. The filtration tank 13 is configured to be capable of treating passing raw water. For example, the filter of the filtration tank 13 restricts the movement of solid particles and the filter medium to the secondary side. The filter medium of the filtration tank 13 collects and removes components to be removed from the raw water by coming into contact with the raw water, for example. For example, the filter medium collects iron components and / or manganese components in raw water, solid particles such as sand, and the like.

[0017] The second switching valve 14 selectively connects the filtration tank 13, the third switching valve 15, and the backwash pump 17. The second switching valve 14 is, for example, a three-way valve. The second switching valve 14 is configured to be switchable between the connection of the filtration tank 13 and the third switching valve 15, and the connection of the filtration tank 13 and the backwash pump 17 according to a command signal from the control system 30.

[0018] The third switching valve 15 is connected to the second switching valve 14, the treated water tank 16, and a cleaning drainage destination (drain) that drains cleaning water during a cleaning process. The third switching valve 15 is, for example, a three-way valve. The third switching valve 15 is configured to be switchable between the connection of the second switching valve 14 and the treated water tank 16, and the connection of the second switching valve 14 and the cleaning drainage destination according to a command signal from the control system 30.

[0019] The treated water tank 16 is a water receiving tank configured to be capable of storing treated water treated in the filtration tank 13. The treated water tank 16 is connected to a supply destination of treated water via, for example, a pump device or the like. A water level detector 19 is provided on a top plate of the treated water tank 16, for example. The treated water tank 16 is formed, for example, in a shape where the water volume (volume) when full is less than the total water volume used for backwash processing.

[0020] The backwash pump 17 sends treated water from the primary side, the treated water tank 16, to the secondary side, the second switching valve 14, and supplies treated water to the filtration tank 13. The backwash pump 17 is driven and controlled by command signals from the control system 30.

[0021] The water supply pump 18 sends treated water from the primary side, the treated water tank 16, to the secondary side, the water supply destination. Here, the water supply destination is, for example, a faucet or shower head installed in a building. The water supply pump 18 is driven and controlled by command signals from the control system 30.

[0022] The water level detector 19 is an electrode-type level switch that detects the water level in the treatment tank 16. The water level detector 19 has a plurality of electrode rods 19a, which are water level detection units that detect water levels, and is configured to detect multiple water levels. The water level detector 19 outputs the detected water level as a signal to the control system 30. One of the plurality of electrode rods 19a is positioned as a common electrode, extending further towards the bottom of the treatment tank 16 than the other electrode rods 19a. Of the remaining plurality of electrode rods 19a, at least one detects a water level that controls two or more of the following: the raw water pump 10, the backwash pump 17, the water supply pump 18, and the replenishment system valve 20.

[0023] As a specific example, the water level detector 19 has five electrode rods 19a, one of which is a common electrode, and the other four electrode rods 19a are configured to detect four different water levels in the treatment tank 16. Here, the four water levels detected by the four electrode rods 19a are designated as the first water level, second water level, third water level, and fourth water level, from high water level to low water level.

[0024] As shown in the embodiment in Figure 4, the first water level is the level when the water is full and the raw water pump is OFF. The second water level is the level when the raw water pump is ON and the replenishment system valve is closed. The third water level is the level when the replenishment system valve is open, the water supply pump can be operated and the backwash pump can be operated. The fourth water level is the level when the water is low, the water supply pump is OFF and the backwash pump is OFF.

[0025] The full water level is the upper limit of the water level that the treatment tank 16 can hold. The raw water pump OFF level is the water level at which the operating raw water pump 10 stops. The raw water pump ON level is the water level at which the stopped raw water pump 10 starts operating. As described above, the first water level and the second water level include water levels used to determine whether or not filtration treatment is possible.

[0026] The backwash pump OFF water level is the water level at which the driven backwash pump 17 is temporarily stopped. Specifically, the backwash pump OFF water level is the water level at which the backwash pump 17 is forcibly stopped during the backwash process, prioritizing the water level detection information detected by the water level detector 19, separate from the timer, processing volume, pressure, etc. that trigger the control of the backwash process. The backwash pump operational water level is the water level at which the backwash pump 17 can be driven. For example, it is the water level at which the backwash pump 17, which is stopped at the backwash pump OFF water level, is restored, that is, the water level at which the temporarily stopped backwash pump 17 is restarted.

[0027] The water supply pump OFF level is the water level at which the running water supply pump 18 is temporarily stopped. Specifically, the water supply pump OFF level is the water level at which the water supply pump 18 is forcibly stopped during water supply processing, prioritizing the water level detection information detected by the water level detector 19, separate from the timer, water supply volume (flow rate), pressure, etc., which are triggers for controlling the water supply process. The water supply pump operational level is the water level at which the water supply pump 18 can be driven. For example, it is the water level at which the water supply pump 18, which is stopped at the water supply pump OFF level, is restored, that is, the water level at which the temporarily stopped water supply pump 18 is restarted. In this way, the third and fourth water levels include water levels for determining whether backwashing is possible during backwashing and whether water is possible during water supply processing.

[0028] The supply system valve closed water level is the water level at which an open supply system valve 20 is closed. The supply system valve open water level is the water level at which a closed supply system valve 20 is opened. Thus, the second and third water levels include water levels used to determine whether or not supply processing is possible.

[0029] The replenishment system valve 20 is, for example, an on-off valve. The replenishment system valve 20 opens and closes the flow path connecting the replenishment system formed by the piping 21 and the treated water tank 16, based on a command signal from the control system 30. The primary side of the replenishment system valve 20 is connected to the replenishment system, such as a water branch pipe, and the secondary side is connected to the treated water tank 16. That is, when the replenishment system valve 20 is open, it supplies water from the replenishment system to the treated water tank 16, and when it is closed, it stops the supply of water from the replenishment system to the treated water tank 16. The water supplied from the primary side of the replenishment system valve 20 can be any water that can be used for backwashing and water supply treatment, and is not limited to tap water; it may also be treated water treated in a separate system.

[0030] The piping 21 fluidly connects each component and forms a flow path for water. Specifically, the piping 21 has first piping 21A to twelfth piping 21L.

[0031] The first pipe 21A connects the raw water pump 10 and the first switching valve 12. The first pipe 21A is also equipped with an on / off valve 11. The second pipe 21B connects the first switching valve 12 and the filtration tank 13. The third pipe 21C connects the first switching valve 12 and the drain outlet during backwashing. The fourth pipe 21D connects the filtration tank 13 and the second switching valve 14. The fifth pipe 21E connects the second switching valve 14 and the third switching valve 15. The sixth pipe 21F connects the third switching valve 15 and the treated water tank 16. The seventh pipe 21G connects the third switching valve 15 and the drain outlet during washing. The eighth pipe 21H connects the treated water tank 16 and the backwash pump 17. The ninth pipe 21I connects the backwash pump 17 and the second switching valve 14. The tenth pipe 21J connects the treated water tank 16 and the water supply pump 18. The 11th pipe 21K connects the water supply pump 18 and the water supply destination. The 12th pipe 21L connects the treated water tank 16 and the replenishment system. A replenishment system valve 20 is also provided in the 12th pipe 21L.

[0032] The first pipe 21A, the second pipe 21B, the fourth pipe 21D, the fifth pipe 21E, and the sixth pipe 21F form a processing passage for normal filtration. The eighth pipe 21H, the ninth pipe 21I, the fourth pipe 21D, the second pipe 21B, and the third pipe 21C form a backwash passage for backwashing.

[0033] The 10th pipe 21J and the 11th pipe 21K form a water supply channel for supplying water. The 12th pipe 21L forms a supply channel for replenishment processing.

[0034] The control system 30 is a control system that controls each component of the water treatment and water supply system 1, and is composed of, for example, multiple control panels. The control system 30 includes, for example, a raw water pump control panel 31, a backwash pump control panel 32, a valve control panel 33, a water level control panel 34, and a water supply pump control panel 35. However, the control system 30 is not limited to combinations of these control panels, and the number and configuration of control panels are not limited as long as the system is capable of controlling the treatment of raw water and the supply of the treated water.

[0035] Each control panel comprises, for example, a communication unit, an input unit, an interface, a display unit, a storage unit, and a control unit. For example, each control panel is configured to be able to send and receive information via wired or wireless means through the communication unit, which is the interface. In addition, each control panel, or any of the control panels, is configured to be able to communicate with an external communication terminal via the communication unit.

[0036] The communication unit of each control panel communicates with an inspection communication terminal, for example, when the water treatment and water supply system 1 is shipped or during maintenance, to receive data such as functional parameters, internal parameters, and external parameters of the water treatment and water supply system 1, various programs for driving the raw water pump 10, backwash pump 17, and water supply pump 18, and managing the lifespan of the filtration tank 13, control programs for each component based on the water level signal from the water level detector 19, and change instructions to modify this data and programs, and transmits them to the storage unit and control unit.

[0037] The input section of each control panel is an input interface for receiving user input. The input section is, for example, an operation panel including buttons.

[0038] The interface of each control panel is selectively connected to the raw water pump 10, on-off valve 11, first switching valve 12, second switching valve 14, third switching valve 15, backwash pump 17, supply water pump 18, water level detector 19, and replenishment system valve 20. Furthermore, the interface can electrically connect to other equipment. In other words, the interface is a terminal or circuit to which various devices are electrically connected.

[0039] Each control panel's display unit includes, for example, a display device such as a segment display, liquid crystal display, or organic EL display, or a lighting unit using LEDs, etc.

[0040] The memory unit of each control panel is a storage medium capable of reading and writing data. The memory unit includes so-called memory or storage. The memory unit of each control panel stores data such as functional parameters, internal parameters, and external parameters used by the control unit in the processing performed by each control panel, data on the filter material of the filtration tank 13, and various data and programs used for controlling the raw water pump 10, on-off valve 11, first switching valve 12, second switching valve 14, third switching valve 15, backwash pump 17, and water supply pump 18, as well as for water level detection. The various data and programs stored in the memory unit are stored for each control panel, corresponding to the processing performed by each control panel.

[0041] The control unit of each control panel is, for example, a processor. The control unit is, for example, a microcontroller. However, the control unit is not limited to a microcontroller and may be a CPU, FPGA, DSP, DSC, or other general-purpose or dedicated processor. Also, if a module including a processor is used in the communication unit, the control unit may be that module. The control unit drives and controls the raw water pump 10, on-off valve 11, first switching valve 12, second switching valve 14, third switching valve 15, backwash pump 17, water supply pump 18, and replenishment system valve 20 based on various data and programs stored in the memory unit. The control unit also includes an inverter that controls the rotational speed of the raw water pump 10, backwash pump 17, and water supply pump 18 by varying the output frequency.

[0042] As a specific example, the raw water pump control panel 31 controls the operation of the raw water pump 10 based on the water level of the treated water tank 16 transmitted from the water level control panel 34. The raw water pump control panel 31 controls the operation of the raw water pump 10 based on data and programs related to the normal filtration and washing processes of raw water stored in the memory unit, as well as the water level in the treated water tank 16 detected by the water level detector 19 output from the water level control panel 34, and also outputs information for normal filtration to the valve control panel 33.

[0043] The backwash pump control panel 32 drives the backwash pump 17. Based on data related to the backwashing process stored in the memory unit, such as data on the filter material of the filtration tank 13, the operating time of the raw water pump 10 obtained from the raw water pump control panel 31, and parameters and programs related to the backwashing process, as well as the water level in the treatment tank 16 detected by the water level detector 19 output from the water level control panel 34, the backwash pump control panel 32 drives the backwash pump 17 and outputs information on the backwashing process to the valve control panel 33. Specifically, the backwash pump control panel 32 drives the backwash pump 17 when the conditions for executing the backwashing process are met and the water level in the treatment tank 16 is above the backwash pump operation level. The backwash pump control panel 32 also stops the backwash pump 17 when the conditions for terminating the backwashing process are met, or when the water level in the treatment tank 16 falls below the backwash pump OFF level. In other words, the backwash pump control panel 32 starts the backwash process with an ON command for the backwash process other than the water level, and ends the backwash process with an OFF command for the backwash process other than the water level. Furthermore, during the backwash process, when the water level in the treatment tank 16 reaches the fourth water level, the backwash pump control panel 32 temporarily stops the backwash pump 17, and when the water level in the treatment tank 16 reaches the third water level, it restarts the backwash pump 17 that was temporarily stopped.

[0044] The valve control panel 33 switches the on / off valve 11, the first switching valve 12, the second switching valve 14, and the third switching valve 15 based on information such as the normal filtration process output from the raw water pump control panel 31, the backwashing process output from the backwash pump control panel 32, and the completion of the backwashing process.

[0045] As a specific example, during normal filtration, the valve control panel 33 opens the on-off valve 11, switches the first switching valve 12 to connect the raw water pump 10 and the filtration tank 13, and switches the second switching valve 14 and the third switching valve 15 to connect the filtration tank 13 and the treated water tank 16, as shown by the arrows in Figure 1. Also, during backwashing, the valve control panel 33 switches the first switching valve 12 to connect the filtration tank 13 and the backwash drain destination, as shown in Figure 2, and switches the second switching valve 14 and the third switching valve 15 to connect the backwash pump 17 (treated water tank 16) and the filtration tank 13. Furthermore, during washing, such as after backwashing, the valve control panel 33 opens the on-off valve 11, switches the first switching valve 12 to connect the raw water pump 10 and the filtration tank 13, and switches the second switching valve 14 and the third switching valve 15 to connect the filtration tank 13 and the washing drain destination.

[0046] The water level control panel 34 outputs the water level of the treated water tank 16, obtained from the water level detector 19, to the raw water pump control panel 31, the backwash pump control panel 32, the valve control panel 33, and the water supply pump control panel 35. As part of the replenishment process, the water level control panel 34 opens and closes the replenishment system valve 20 depending on the water level in the treated water tank 16. Specifically, when the water level in the treated water tank 16 falls below the replenishment system valve opening level, the water level control panel 34 switches the replenishment system valve 20 to open in order to supply water to the treated water tank 16 from the replenishment system, such as a water supply branch pipe. Also, when the replenishment system valve 20 is open, if the water level in the treated water tank 16 rises above the replenishment system valve closing level, the water level control panel 34 switches the replenishment system valve 20 to close in order to stop the supply of water from the replenishment system.

[0047] The water supply pump control panel 35 drives the water supply pump 18. The water supply pump control panel 35 drives and controls the water supply pump 18 based on data related to water supply processing stored in the memory unit, such as pressure and flow rate acquired by sensors on the secondary side of the water supply pump 18, and parameters and programs related to water supply processing. Specifically, the water supply pump control panel 35 starts the execution of water supply processing with an ON command for water supply processing other than water level, and ends the execution of water supply processing with an OFF command for water supply processing other than water level. Furthermore, during water supply processing, if the water level in the treatment tank 16 reaches the fourth water level, the water supply pump control panel 35 temporarily stops the water supply pump 18, and when the water level in the treatment tank 16 reaches the third water level, it restarts the water supply pump 18 that was temporarily stopped.

[0048] The control system 30, including these control panels, is a control device that selectively performs the following by controlling each component: a normal filtration process in which raw water supplied by the raw water pump 10 is filtered in the filtration tank 13; a backwashing process in which treated water is backflowed into the filtration tank 13 by the backwash pump 17 to clean the filtration tank 13; and a washing process in which the backwash water used for backwashing is drained from the filtration tank 13 after the backwashing process. The control system 30 is also a control device that performs a water supply process in which treated water treated in the filtration tank 13 is supplied to the water supply destination, and a replenishment process in which water is supplied to the treated water tank 16 from the replenishment system.

[0049] Next, the control operation of each component by the control system 30 will be explained using Figures 5 to 7. Figure 5 is an explanatory diagram illustrating the triggers for the operation of the raw water pump 10, backwash pump 17, water supply pump 18, and replenishment system valve 20. Figure 6 is an explanatory diagram illustrating the operation of the raw water pump 10, backwash pump 17, water supply pump 18, and replenishment system valve 20 in Figure 5. Figure 7 is an explanatory diagram illustrating the operation of the raw water pump 10, backwash pump 17, water supply pump 18, and replenishment system valve 20 at each water level.

[0050] In Figure 5, ON (open) means the raw water pump 10, backwash pump 17, and water supply pump 18 are started, and the supply system valve 20 is open. OFF (closed) means the raw water pump 10, backwash pump 17, and water supply pump 18 are stopped, and the supply system valve 20 is open. Also, ON stop in Figure 5 means the temporary stop of the backwash pump 17 and water supply pump 18 while they are in the process of being driven. ON stop release means the return of the backwash pump 17 and water supply pump 18, which are temporarily stopped during the process of being driven, i.e., they are driven again.

[0051] For example, ON (open) is the operation in which one control panel outputs an ON command that triggers the control of each component to other control panels, and the control panel that receives this ON command controls the component. OFF (closed) is the operation in which one control panel outputs an OFF command that triggers the control of each component to stop (stop the ON command) to other control panels, and the control panel that receives the OFF command terminates the control of the component.

[0052] ON stop is an operation in which the water level control panel 34 outputs an OFF command, which is a trigger for temporarily stopping (stopping the ON command) the components that are driven and controlled based on ON commands output from control panels other than the water level control panel 34. The control panel that receives this OFF command based on the water level (electrode) temporarily stops the drive control of the components.

[0053] The ON stop release is an operation in which, during a temporary stop of a component whose drive control is based on an ON command output from a control panel other than the water level control panel 34, the water level control panel 34 outputs an ON command that acts as a trigger to resume drive control of the component (release of the ON command stop), and the control panel that receives this ON command based on the water level (electrode) resumes drive control of the temporarily stopped component.

[0054] For example, when the water level in the treated water tank 16 reaches the second water level (raw water pump ON level), which drives the raw water pump 10, as shown by the solid line in Figure 1, the control system 30 outputs an ON command for the raw water pump 10 from the water level control panel 34. Based on this command, the control system 30 starts the raw water pump 10 and begins the normal filtration process. When the water level in the treated water tank 16 reaches the first water level (raw water pump OFF level), which stops the raw water pump 10, i.e., when the treated water tank 16 is full, the control system 30 outputs an OFF command for the raw water pump 10 from the water level control panel 34. Based on this command, the control system 30 stops the raw water pump 10 and ends the normal filtration process.

[0055] Furthermore, for example, if the water level in the treatment tank 16 is at or above the third water level (backwash pump operation level) which allows the backwash pump 17 to operate, the control system 30 will determine whether the conditions for performing backwashing are met when an ON command for the backwash pump 17 is output from the water level control panel 34. If the control system 30 receives an ON command for the backwash pump 17 and the conditions for performing backwashing are met, it will start the backwashing process and drive the backwash pump 17. However, even if an ON command for the backwash pump 17 is output, the control system 30 will not start the backwashing process if the conditions for performing backwashing are not met.

[0056] Furthermore, the control system 30 terminates the backwashing process if the conditions for terminating the backwashing process are met during the backwashing process. Also, if the conditions for terminating the backwashing process are not met, and the water level drops from the third level to the fourth level (backwash pump OFF level), and the control system 30 outputs a signal to stop the backwashing pump 17 (ON stop), the backwashing process will not terminate, and the backwashing pump 17 will be temporarily stopped. Furthermore, when the water level drops from the fourth level to the third level (backwashing pump operation level), the control system 30 restarts the stopped backwashing pump 17.

[0057] Here, the conditions for performing the backwashing process are, for example, the amount of raw water that has passed through the filtration tank 13, the time spent performing the normal filtration process, or a predetermined period or date and time. The conditions for performing the backwashing process are measured or timed from, for example, after the previous backwashing and washing process has been completed. The conditions for ending the backwashing process are, for example, the amount of treated water that has passed through the filtration tank 13 in reverse flow or the time spent performing the backwashing process. The conditions for ending the backwashing process are determined, for example, based on values ​​measured or timed from the start of the backwashing process.

[0058] When the water level in the treatment tank 16 is at or above the third water level (water level at which the water supply pump can be operated), and an ON command for the water supply pump 18 is output from the water level control panel 34, the control system 30 determines whether the conditions for performing water supply treatment based on the pressure and / or flow rate on the secondary side of the water supply pump 18 are met. If the ON command for the water supply pump 18 is output and the conditions for performing water supply treatment are met, the control system 30 starts water supply treatment and drives the water supply pump 18. However, even if an ON command for the water supply pump 18 is output, the control system 30 will not start water supply treatment if the conditions for performing water supply treatment are not met.

[0059] Furthermore, the control system 30 terminates the water supply process if the conditions for terminating the water supply process are met during the process. Also, if the conditions for terminating the water supply process are not met, and the water level drops from the third level to the fourth level (water supply pump OFF level), and the control system 30 outputs a signal to stop the water supply pump 18 (ON stop), the water supply process will not terminate, but the water supply pump 18 will be temporarily stopped. Furthermore, if the water level drops from the fourth level to the third level (backwash pump operation level), the control system 30 will restart the stopped water supply pump 18.

[0060] Furthermore, when the water level in the treatment tank 16 reaches the third water level (supply system valve open level), which opens the replenishment system valve 20, the control system 30 outputs an ON command for the replenishment system valve 20 from the water level control panel 34, opens the closed replenishment system valve 20, and starts the replenishment process. When the water level in the treatment tank 16 reaches the second water level (supply system valve closed level), which closes the replenishment system valve 20, the control system 30 closes the open replenishment system valve 20 and ends the replenishment process.

[0061] Next, an example of backwashing by the water treatment supply system 1 configured as described above will be explained using explanatory diagrams in Figures 2, 8, and 9. In this embodiment, the backwashing process is executed when a predetermined time arrives, and the process is terminated after a predetermined time has elapsed from the start of the backwashing process. As a specific example, the backwashing process is to start at 5:00 AM and end at 5:15 AM, 15 minutes later. The condition for terminating the backwashing process is not limited to the elapsed time from the start of the backwashing process; for example, it could be the time the backwash pump 17 is running or the amount of water that has flowed back into the filtration tank 13.

[0062] Furthermore, as an example of this backwashing process, we will explain an example in which water supply treatment is performed even during the backwashing process, and in which the water level in the treatment tank 16 falls from a level higher than the third water level to a level lower than the third and fourth water levels due to the backwashing process and the water supply treatment.

[0063] First, until 5:00 AM, the normal filtration process, indicated by the solid arrows in Figure 1, and the water supply process, indicated by the dashed arrows in Figure 1, are performed as appropriate. At this time, as shown in Figure 9, the backwash pump control panel 32 outputs an OFF signal, and the backwash pump 17 is stopped. Then, at 5:00 AM, assuming that the conditions for performing the backwash process are met, the backwash pump control panel 32 outputs an ON signal for the backwash pump 17 (start of backwash process) to the raw water pump control panel 31 and the valve control panel 33, and starts the backwash pump 17. The raw water pump control panel 31, which has received the ON signal for the backwash pump 17, stops driving the raw water pump 10. The valve control panel 33, which has received the ON signal for the backwash pump 17, switches the first switching valve 12, the second switching valve 14, and the third switching valve 15 to form the backwash path, as shown by the solid arrows in Figure 2.

[0064] In this way, at a predetermined time, the backwashing process is started, the raw water pump 10 stops, and the backwash pump 17 is activated, causing the treated water in the treated water tank 16 to flow back into the filtration tank 13, as shown by the solid arrows in Figure 2, and backwashing is performed. Also, if water supply treatment is already being performed, or if the conditions for performing water supply treatment are met, water supply treatment is performed in parallel with the backwashing process, as shown by the dashed arrows in Figure 2.

[0065] For example, when the water level in the treatment tank 16 drops below the third water level, as shown by the dashed line in Figure 2, due to backwashing and water supply treatment, the water level control panel 34 performs a replenishment process and switches the replenishment system valve 20 to open, thereby supplying water to the treatment tank 16 from the replenishment system.

[0066] Furthermore, even if backwashing and water supply treatment are continued and water is supplied from the supply system, if the water level in the treatment tank 16 falls below the 4th water level 5 minutes after the start of backwashing treatment (5:05 AM), as shown by the dashed line in Figure 1, the water level control panel 34 will output an OFF signal (ON stop signal) for the backwash pump 17 and an OFF signal (ON stop signal) for the water supply pump 18 to the backwash pump control panel 32 and the water supply pump control panel 35, as the water supply pump OFF level and backwash pump OFF level have been reached, and will also output an ON signal for the raw water pump 10 to the raw water pump control panel 31 and the valve control panel 33.

[0067] As a result, the backwash pump control panel 32 temporarily stops the backwash pump 17, the water supply pump control panel 35 temporarily stops the water supply pump 18, and the valve control panel 33 switches from the backwash path shown by the solid arrow in Figure 2 to the treatment path shown by the solid arrow in Figure 1, and the raw water pump 10 is driven. As a result, normal filtration is performed, and treated water and replenishment water from the replenishment system are supplied to the treated water tank 16.

[0068] Normally, filtration is performed, and when the water level in the treated water tank 16 reaches the third water level or higher, as shown by the solid line in Figure 2, for example, after 5 minutes (5:10 AM), the water level control panel 34, recognizing that the water supply pump and backwash pump are at the operational water level, outputs an ON signal (ON stop release signal) for the backwash pump 17 and an ON signal (ON stop release signal) for the water supply pump 18 to the backwash pump control panel 32, the valve control panel 33, and the water supply pump control panel 35, and outputs an OFF signal (ON command stop signal) for the raw water pump 10 to the raw water pump control panel 31 and the valve control panel 33.

[0069] As a result, the raw water pump control panel 31 stops the raw water pump 10, and the valve control panel 33 switches from the treatment path shown by the solid arrow in Figure 1 to the backwash path shown by the solid arrow in Figure 2. The water supply pump control panel 35 then restarts the water supply pump 18 and the backwash pump 17. This restarts the water supply treatment and backwash treatment.

[0070] After the water supply treatment and backwash treatment are resumed, and after some time has passed, and the conditions for ending the backwash treatment are met 15 minutes after the start of the backwash treatment (5:15 AM), the backwash pump control panel 32 outputs an OFF signal (stop signal for the ON command) for the backwash pump 17 to the raw water pump control panel 31 and the valve control panel 33 as a command to end the backwash treatment. As a result, after 5:15 AM, the backwash pump 17 is stopped by the backwash pump control panel 32, and the valve control panel 33 switches from the backwash path shown by the solid arrow in Figure 2 to the treatment path shown by the solid arrow in Figure 1, and the raw water pump 10 is driven. As a result, normal filtration treatment is performed, and treated water and replenishment water from the replenishment system are supplied to the treated water tank 16.

[0071] For example, when normal filtration is performed and the water level in the treated water tank 16 reaches the second water level or higher, as shown by the solid line in Figure 1, the water level control panel 34 closes the supply system valve 20. Also, for example, when normal filtration is performed and the water level in the treated water tank 16 reaches the first water level or higher, the water level control panel 34 outputs an OFF signal (stop signal for the ON command) for the raw water pump 10 to the raw water pump control panel 31, and the raw water pump control panel 31 stops the raw water pump 10. As a result, as shown in Figure 3, only the water supply process continues until the water level in the treated water tank 16 falls below the second water level.

[0072] With the water treatment and water supply system 1 configured in this way, by using the electrode rods 19a of the water level detector 19 for different purposes, it is possible to reduce the total number of electrode rods 19a (water level detector devices), eliminating the need for multiple water level detectors 19. Specifically, in order to detect the ON / OFF status of the raw water pump 10, the ON / OFF status of the backwash pump 17, the ON / OFF status of the water supply pump 18, the opening and closing of the replenishment system valve 20, and the full and low water levels, as shown in Figure 4, at least 10 electrode rods 19a are required in addition to the electrode rod 19a that serves as the common electrode. Furthermore, since multiple holders are required to hold these electrode rods 19a, as shown in the comparative example in Figure 4, for example, three water level detectors 19 are required, resulting in 13 electrode rods 19a including those for the common electrode and water level detection. In contrast, if the above configuration is applied as an example, only 5 electrode rods 19a are needed, including those for the common electrode and water level detection, and as a result, only one water level detector 19 is required.

[0073] Furthermore, since the number of electrode rods 19a in the water treatment and water supply system 1 can be reduced, the number of terminals on the signal receiving control panel can be reduced, thus enabling a smaller control panel. In addition, even with a reduced number of electrode rods 19a, the water treatment and water supply system 1 allows for highly accurate adjustment of the inflow and outflow rates of the treatment tank 16 because the water level detection is subdivided for the control of each component. This reduces the need for a margin in effective capacity, enabling a reduction in the capacity of the treatment tank 16 and a smaller treatment tank 16. Moreover, since the number of water level detectors 19 and the total number of electrode rods 19a can be reduced, the amount of work required for cable routing and connection is reduced, manufacturing and maintenance processes become easier, and manufacturing and maintenance costs can be reduced.

[0074] According to the water treatment and water supply system 1 of the above embodiment, the number of electrode rods 19a, which are the water level detection units of the water level detector 19, can be reduced by using the water level detected by the electrode rods 19a to control multiple components.

[0075] The water treatment and water supply system 1 is not limited to the example described above. For example, the configuration of the control system 30 described above can be changed as appropriate. For example, the opening and closing control of the replenishment system valve 20 may be directly performed by the water level control panel 34, or the water level control panel 34 may send a signal to the control means that performs the opening and closing control. Also, the multiple control panels described above are just examples, and the number and functions of the control panels are not limited as long as they can perform at least the functions described above. Furthermore, the arrangement of each component and the mechanical and structural descriptions of various valves etc. do not exclude other examples that cannot be recognized.

[0076] Furthermore, in the example described above, when the water level in the treatment tank 16 falls below the supply system opening level during backwashing or water supply, the amount of treated water used in the treatment tank 16 is considered to have exceeded a predetermined amount, and the supply system valve 20 is opened to supply water to the treatment tank 16 from the supply system. However, the opening and closing control of the supply system valve 20 may be configured to predict the remaining water amount in the treatment tank 16 based on the amount of water supplied, such as the flow rate and rotation speed of the backwash pump 17 and / or water supply pump 18, rather than monitoring the water level in the treatment tank 16, and to open or close the supply system valve 20 accordingly. Also, the timing for opening the supply system valve 20 during backwashing may be when the backwash pump 17 is not running.

[0077] Furthermore, for example, even during backwashing, while the backwash pump is temporarily stopped, the raw water pump 10 can be operated to perform normal filtration and supply treated water to the treated water tank 16 in order to raise the water level from below the backwash pump OFF level to above the water level at which the backwash pump can operate. In the water supply treatment where treated water is supplied from the treated water tank 16 to the secondary side, by supplying treated water to the treated water tank 16 through normal filtration, separate from the water supply from the replenishment system, treated water used for water supply treatment or backwashing treatment can be quickly stored in the treated water tank 16.

[0078] Furthermore, in the example described above, the water treatment and water supply system 1 has the functions of a water treatment device and a water supply device, and in order to perform each function of the water treatment device and water supply device, an example was described in which the water levels of the treatment tank 16 detected by the water level detector 19 are used to control two or more components. However, the control of components using each water level is not limited to the above configuration, and even if only one of the multiple water levels detected by the water level detector 19 is used to control two or more components, the number of water level detection units can be reduced. Also, for example, this may be applied to a water treatment and water supply system 1 that does not use water levels for water supply treatment.

[0079] In other words, the present invention is not limited to the embodiments described above, and can be modified in various ways during implementation without departing from its essence. Furthermore, each embodiment may be combined as appropriate, and in that case, the combined effects can be obtained. Moreover, the above embodiments include various inventions, and various inventions can be extracted by selecting combinations from the multiple constituent elements disclosed. For example, if the problem can be solved and effects obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiment, then the configuration with these deleted constituent elements can be extracted as an invention. [Explanation of Symbols]

[0080] 1...Water treatment and water supply system, 10...Raw water pump, 11...On / off valve, 12...First switching valve, 13...Treatment tank, 14...Second switching valve, 15...Third switching valve, 16...Treatment tank (receiving tank), 17...Backwash pump, 18...Water supply pump, 19...Water level detector, 19a...Electrode rod (water level detection unit), 20...Supply system valve, 21...Piping, 21A...First piping, 21B...Second piping, 21C...Third Piping, 21D...4th piping, 21E...5th piping, 21F...6th piping, 21G...7th piping, 21H...8th piping, 21I...9th piping, 21J...10th piping, 21K...11th piping, 21L...12th piping, 30...Control system (control device), 31...Raw water pump control panel, 32...Backwash pump control panel, 33...Valve control panel, 34...Water level control panel, 35...Water supply pump control panel.

Claims

1. A water treatment device that filters raw water and stores it in a receiving tank, The aforementioned water receiving tank is provided with a water supply device that replenishes and supplies water from an external source, The water treatment device and the water supply device have a water level detector having a plurality of water level detection units that detect water levels to determine whether a plurality of the water supply device can be operated, A control device that determines whether at least two of the multiple movable states of the water treatment device and the water supply device are movable or not based on at least one of the multiple water levels detected by the multiple water level detection units, A water treatment and water supply system equipped with the following features.

2. The water treatment device has a treatment passage for filtering the raw water and a backwash passage for backwashing, The water supply system has a water supply channel for supplying water and a supply channel for replenishing water to the water tank. The water treatment and water supply system according to claim 1, wherein one of the water level detection units detects a water level for determining whether backwashing is possible and whether replenishment is possible.

3. The water treatment apparatus comprises a raw water pump, a filtration tank for treating the raw water supplied from the raw water pump, and a backwash pump for washing by backflowing the treated water from the receiving tank into the filtration tank. The water supply device includes a water supply pump that sends the treated water from the receiving tank to the water supply destination, and a supply system valve that opens and closes the supply passage that supplies water to the receiving tank from the supply system. The control device is The raw water pump is driven and stopped, and the supply system valve is opened and closed, based on the water level in the receiving tank. The water treatment and water supply system according to claim 2, wherein the backwash pump and the water supply pump are driven and stopped by a command other than the water level, and the driven backwash pump and the water supply pump are temporarily stopped and stopped again based on the water level in the water receiving tank.

4. The water treatment and water supply system according to claim 3, wherein the water level detector detects a first water level for detecting the water level at which the receiving tank is full and the raw water pump is stopped, a second water level for detecting the water level at which the raw water pump is started and the supply system valve is opened, a third water level for detecting the water level at which the supply system valve is opened and the backwash pump is operational and the water supply pump is operational, and a fourth water level for detecting low water levels, the water supply pump is stopped and the backwash pump is stopped.

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