JP2019118901A - Water purifier - Google Patents

Abstract

To provide a water purifier comprising a backwash system which can reduce a cost and can avoid a risk of suspension of water supply.SOLUTION: A water purifier 1 comprises: a pipeline 23 in which raw water, which is supplied from a water source, is circulated; a flow rate detection part 16 which detects a flow rate of the raw water circulated in the pipeline 23; a filtration tank 31 having a filter material which captures impure components contained in the raw water; a storage part 42 in which a correction coefficient Dc is stored; and a control part 43 which calculates a maximum filtration water amount in which an amount of the impure components, which can be captured by the filter material, is divided by a concentration of the impure components contained in the raw water, an integration water amount of teh raw water circulated in a prescribed time which is measured by the flow rate detection part 16, a filtable water amount in which the integration water amount is subtracted from the maximum filtration water amount, and an actual filtration water amount of a date quantity such that an average of the integration water amount is calculated for every prescribed number of days, continues a filtration operation when the filtable water amount exceeds the actual filtration water amount of a date quantity which is divided by a prescribed correction coefficient, and transfers the filtration operation to a backwash operation when the filtable water amount falls below the actual filtration water amount of a date quantity which is divided by the correction coefficient.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a water purification apparatus for removing impure components contained in raw water.

  There is known a water purifier that removes impure components such as iron and manganese contained in raw water such as well water. The water purifier contains a filter medium for trapping and removing impure components in the filter tank. Such a water purification apparatus passes raw water having a chemical solution injected into the filtration tank, thereby capturing and removing impure components such as iron and manganese with the filter medium, and discharging it from the filtration tank as clear purified water. The purified water discharged from the filtration tank is stored, for example, in a water receiving tank, and is supplied to a predetermined position by an automatic water supply pump or the like connected to the water receiving tank.

  However, if the filtration operation is continued in a state where the amount of captured impurity components by the filter medium is a predetermined amount or more, the concentration of the impurity components in the purified water exceeds the water quality standard. For this reason, it is necessary to carry out a backwashing operation in which the impurities captured by the filter material are discharged out of the filtration tank before the amount of captured impure components by the filter material becomes equal to or more than a certain amount.

  In this backwashing operation, for example, the purified water is made to flow in the filtration tank so as to be a reverse flow to the filtration operation, and the purified water is used to wash away impure components accumulated in the filter material to perform the function of the filter material. It is to recover.

  Moreover, the water purifier is known to have a backwashing system that automatically starts the backwashing operation by satisfying a predetermined condition. As such a backwashing method, for example, a time backwashing method is known in which a backwashing operation is performed at a preset time by a 24-hour timer built in a control panel.

  In addition, the water purifier divides the amount of impurities that can be removed by the filtration material per pre-stored filtration operation by the concentration of the impurities contained in the raw water, thereby making the maximum amount of filtered water, that is, one filtration operation. There is also known a removal amount backwashing method in which the amount of raw water that can be filtered is calculated and the backwashing operation is performed when the integrated water amount detected by the flow rate detection unit reaches the maximum filtered water amount (for example, Patent Document 1) reference).

JP, 2009-273968, A

  The time backwashing method and the removal amount backwashing method described above have the following problems. With regard to the time backwashing method, when the usage status of the filtered water can not be grasped by the user, or when the fluctuation of the filtered water volume is large, it is necessary to set the backwashing operation to be performed frequently in consideration of safety. . However, even if there is room for the filter material to capture impure components, such as fluctuations in the amount of filtered water are smaller than expected, it is always transferred to the backwash operation at the set time, so the drive and stop of the backwash pump Power consumption increases. For this reason, the running cost of the water purifier increases.

  With regard to the removal amount backwashing method, when the start of the backwashing operation overlaps with the time when the amount of water supplied is large, there is a possibility that the water may be cut off. Also, when purified water is temporarily stored in the water receiving tank and water is supplied to the end with an automatic water supply pump etc., it is possible to use the purified water stored in the water receiving tank for backwashing, but the time when the water supply amount is large In consideration of the possibility of backwashing the belt and water shortage, it is necessary to increase the water receiving capacity. That is, the initial cost for the installation of the water receiving tank is increased.

  Therefore, the present invention provides a water purifier equipped with a backwashing system capable of cost reduction by reducing backwashing frequency and reducing the volume of a water receiving tank, and capable of avoiding the risk of water shortage. The purpose is

  According to one aspect of the present invention, a pipe through which raw water supplied from a water source flows, a flow rate detection unit that detects the flow rate of the raw water flowing through the pipe, and a filter medium that captures impurities contained in the raw water A filtration tank having a memory, a storage unit storing a correction coefficient, and a maximum filtered water amount obtained by dividing the amount of the impure component which can be captured by the filter material by the concentration of the impure component contained in the raw water; The integrated water volume of the raw water distributed in the predetermined time measured by the filter, the filterable water volume obtained by subtracting the integrated water volume from the maximum filtered water volume, and the daily filtered water volume when the average of the integrated water volume is calculated every predetermined number of days When the actual amount is calculated and the filterable water volume exceeds the daily filtered water volume results divided by the predetermined correction factor, the filtration operation is continued, and the daily filterable water volume results divided by the filterable water volume by the correction factor If below and a control unit to shift to the backwash operation.

  ADVANTAGE OF THE INVENTION According to this invention, the water purifier provided with the backwashing system which can reduce the frequency of backwashing and risk avoidance of water supply can be provided.

Explanatory drawing which shows the structure of the water purifier which concerns on one Embodiment of this invention. The flowchart which shows an example of use of the water purifier. The flowchart which shows an example of use of the water purifier. The flowchart which shows an example of use of the water purifier. The flowchart which shows an example of use of the water purifier. The flowchart which shows an example of use of the water purifier.

The water purifier 1 which concerns on one Embodiment of this invention is demonstrated using FIG.1 and FIG.2.
FIG. 1 is an explanatory view showing a configuration of a water purifier 1 according to an embodiment of the present invention, and FIG. 2 is a flow chart showing an example of a control method of backwashing operation using the water purifier 1.

  As shown in FIG. 1, the water purifier 1 includes a pump device 11 provided in a raw water supply source 100, a filtration unit 12 provided on the secondary side of the pump device 11, and a secondary side of the filtration unit 12. A water receiving tank 13 provided, a backwashing pump 14, a chemical solution injection device 15, a flow rate detection unit 16, and a control panel 17 are provided.

  The water purifier 1 injects a chemical solution into the raw water pumped up from the supply source 100 by the pump device 11 with the chemical solution injector 15, and allows the filter unit 12 to pass through the filtration unit 12 to capture and remove impure components contained in the raw water. Be done. Here, the supply source 100 is, for example, a well.

  The pump device 11 is, for example, a pump device capable of pumping raw water from the supply source 100. The pump device 11 includes a pump 21, a motor 22 that drives the pump 21, and a pipe 23 connected to the secondary side of the pump 21. The pump 21 is connected to the filtration unit 12 via a pipe 23. The motor 22 is connected to the control board 17 via a signal line 99.

  The filtration unit 12 includes a filtration tank 31, a suction pipe 32, a first three-way valve 33, a drainage pipe 34, a discharge pipe 35, a second three-way valve 36, a water supply pipe 37, and a backwash piping 38. Equipped with

  The filtration tank 31 includes a plurality of filtration media stacked inside. The filter material is configured to be capable of removing solid substances such as iron and manganese and sand contained in the raw water from the raw water into which the chemical solution is injected.

  The suction pipe 32 is connected to the filtration tank 31. For example, one end of the suction pipe 32 is disposed above the plurality of filter media.

  The first three-way valve 33 is a motor operated valve. The first three-way valve 33 has three ports, and connects any two of these ports by switching the internal flow path. The first port of the first three-way valve 33 is connected to the pipe 23. The second port of the first three-way valve 33 is connected to the other end of the suction pipe 32. The third port of the first three-way valve 33 is connected to one end of the drain pipe 34.

  The drain 34 is connected to the drain 110 at the other end, and configured to drain water flowing through the drain 34.

  The discharge pipe 35 is connected to the filtration tank 31. Further, one end of the discharge pipe 35 is disposed below the lowermost layer of the plurality of filtration tanks.

  The second three-way valve 36 is a motor operated valve. The second three-way valve 36 has three ports, and connects any two of these ports by switching the internal flow path. The first port of the second three-way valve 36 is connected to the other end of the discharge pipe 35. The second port of the second three-way valve 36 is connected to one end of the water supply pipe 37. The third port of the second three-way valve 36 is connected to one end of the backwash piping 38.

  The other end of the water supply pipe 37 is connected to the water receiving tank 13. The water supply pipe 37 constitutes a flow path for supplying the water discharged from the discharge pipe 35 to the water receiving tank 13. The other end of the backwashing pipe 38 is connected to the backwashing pump 14.

  The backwashing pump 14 includes a pump 51, a motor 52, and a check valve 53 and an on-off valve 54 provided on the secondary side of the pump 51. The motor 52 is connected to the control board 17 via a signal line 99. The on-off valve 54 is configured to be able to open and close manually, for example.

  The chemical solution injection device 15 is connected to the pipe 23 and configured to be capable of injecting a chemical solution of an amount according to the concentration of the raw water into the raw water flowing through the pipe 23.

  The flow rate detection unit 16 is provided on the primary side of the filtration tank 31 and configured to be capable of detecting the flow rate of raw water flowing in the piping 23. In addition, the flow rate detection part 16 should just be able to detect the amount of filtered water which is the amount of filtered water, for example, may be provided in the secondary side of the filtration tank 31.

  The control panel 17 includes an input unit 41, a storage unit 42, and a control unit 43. The control panel 17 also has a calendar function configured by the storage unit 42 and the control unit 43 and a function of measuring time. As a specific example, the control panel 17 is configured by, for example, a program stored in the storage unit 42 and can measure 24 hours, and when the time set arbitrarily is reached, the information is sent to the control unit 43 A 24-hour timer configured to be transmittable is incorporated.

  The input unit 41 is configured to be able to input a raw water concentration which is a concentration of an impurity contained in the raw water. In addition, it is configured to be able to input various setting values used for selection of a backwashing method to be described later and determination by the control unit 43. Further, the setting of the 24-hour timer used in the storage unit 42 and the control unit 43 can be input.

  The storage unit 42 stores in advance the maximum removal amount of the impurities in the raw water set for each model of the water purifier 1, that is, the amount of the impurities that can be removed by the filtering material in the filtration operation of one cycle. Here, one cycle of filtration operation means from the start of the filtration operation to the next backwash operation. The storage unit 42 stores the raw water concentration input by the input unit 41. The storage unit 42 also stores the backwashing permission time for permitting the backwashing input by the input unit 41. The backwashing permission time is appropriately set in accordance with the situation of a building or the like in which the water purifier 1 is used.

  The control unit 43 is electrically connected to the flow rate detection unit 16, the first three-way valve 33, the second three-way valve 36, and the motors 22 and 52 via the signal line 99. The control unit 43 is configured to be able to switch between the first three-way valve 33 and the second three-way valve 36. The control unit 43 controls the pump 21 by controlling the motor 22 and drives the pump 51 by controlling the motor 52 so that the pump device 11 and the backwashing pump 14 can be controlled.

  The control unit 43 calculates the maximum filtered water amount obtained by dividing the maximum removal amount by the raw water concentration as the water amount of the raw water that can be filtered per cycle, and stores the calculated maximum filtered water amount in the storage unit 42. The control unit 43 integrates the water volume detected by the flow rate detection unit 16, stores the integrated value as an integrated water volume, and stores the integrated water volume when one day has passed in the storage unit 42 as an integrated filtered water volume.

  Control unit 43 subtracts the filtered water volume detected by flow rate detector 16 from the maximum filtered water volume, calculates the remaining filterable water volume that can be filtered by the filter medium at a predetermined time after the filtration operation, and stores it in storage unit 42 .

  In addition, the control unit 43 calculates an average value of the integrated filtered water amount calculated every given day set by the input unit 41, and stores the calculated average value in the storage unit 42 as the daily filtered water amount. Further, the control unit 43 repeatedly calculates the daily filtered water amount for each set day, and updates the value. In the present embodiment, an example in which the set date is set to every day of the week, that is, seven days from day to saturday will be described below. In this example, the control unit 43 detects the accumulated filtered water volume for each of the seven days from day to saturday on a weekly basis, calculates the average value for each day of the week by the calculating means 42a, and updates it. It stores in the storage unit 42 as a daily filtered water volume result on the day of the week.

Further, the control unit 43 has the following functions (1) to (3).
(1) A function to perform filtration operation to filter raw water.

  (2) A function to perform a backwashing operation of backwashing water in the filtration tank 31 to wash the inside of the filtration tank 31.

  (3) Function to switch filtration operation and backwash operation.

  Next, the functions (1) to (3) possessed by the control unit 43 will be described.

  The function (1) is a function of performing a filtration operation of removing impurities consisting of iron, manganese and solids from the raw water by filtering the raw water into which the chemical solution is injected in the filtration tank 31. Specifically, the control unit 43 is configured to be able to configure a flow path connected to the water receiving tank 13 from the pump 21 of the pump device 11 through the pipe 23, the suction pipe 32, the filtration tank 31, the discharge pipe 35, and the water supply pipe 37. Switches the first three-way valve 33 and the second three-way valve 36.

  In this state, the control unit 43 controls the motor 22 to drive the pump 21 to supply the raw water to the filtration tank 31 and inject the chemical solution into the raw water according to the flow rate, and the raw water into which the chemical solution is injected. Pass through the filtration tank 31. Thereby, while the iron and manganese which are contained in raw water are removed by the filter medium in the filtration tank 31, the solid substance in raw water is filtered. The flow of water during the filtration operation is shown by a solid arrow in FIG. In addition, the control unit 43 integrates the amount of filtered water when the filtration operation is performed by the function, and stores the integrated amount in the storage unit 42.

  The function (2) is to flow the water in the water receiving tank 13 from the discharge pipe 35 toward the suction pipe 32 in the filtration tank 31 to remove impurities and the like trapped by the filter material in the filtration tank 31 and filter it. It is a function of performing a backwash operation to wash the inside of the tank 31. Specifically, the control unit 43 controls the first three-way valve 33 and the first three-way valve 33 such that the pump 51 of the backwash pump 14 flows from the pump 51 to the backwash pipe 38, the discharge pipe 35, the filtration tank 31, the suction pipe 32, and the drain pipe 34 in this order. 2. Switch the three-way valve 36.

  In this state, when the control unit 43 drives the motor 52 for a predetermined time, the water stored in the water receiving tank 13 flows back through the filter tank 31 from the discharge pipe 35 and passes through the suction pipe 32 to the drain pipe 34. Pass through. Thereby, the filter medium in the filtration tank 31 is cleaned, and the polluted water which has cleaned the filter medium is drained to the drainage destination 110. As described above, the impurities in the filtration tank 31, the impurities attached to the filtration material, and the like are removed, and the inside of the filtration tank 31 is cleaned. The flow of water during the backwash operation is indicated by a broken arrow in FIG. Also, as the function (2), when the time of the backwashing operation input or the time of the backwashing operation stored in advance in the storage unit 42 elapses, the first three-way valve 33 and the second three-way valve 36 are switched. The raw water is allowed to pass through the suction pipe 32, the filter tank 31, and the discharge pipe 35 in this order, and the three-way valve provided between the second three-way valve 36 and the water receiving tank 13 is switched to drain the water. That is, the cleaning operation is an operation of cleaning and draining the insides of the flow paths and the filtration tank 31 after the backwashing operation. The water that has passed through the filtration tank in the cleaning operation is drained without being moved to the water receiving tank 13. In the embodiment, although the configuration for draining during the cleaning operation is omitted, as described above The third three-way valve 36 and the water receiving tank 13 may be configured to have a three-way valve for switching the flow path to the drain 110, or may be another configuration.

  The function (3) is a function of shifting to the backwash operation of the function (2) during the filtration operation of the function (1) when it is determined by the control unit 43 that the predetermined condition is satisfied. As a specific example, the control unit 43 performs the backwashing according to the time backwashing method, the removal amount backwashing method, or the designated removal amount backwashing method. The plurality of backwashing methods are selected by the user inputting through the input unit 41.

  The time backwashing method is a method in which backwashing is performed for a predetermined time at a time set in a 24-hour timer. That is, the control unit 43 monitors the timer for 24 hours, and switches from the filtration operation to the backwash operation when the set time is reached.

  The removal amount backwashing method is a method in which the integrated water amount is compared with the maximum filtered water amount, and the backwashing operation is performed when the integrated water amount reaches the maximum filtered water amount. That is, when the integrated water volume detected by the flow rate detection unit 16 during filtration operation is compared with the maximum filtered water volume calculated from the raw water concentration and the integrated water volume compares the maximum filtered water volume, the control unit 43 Switch to driving.

  The designated removal amount backwashing method is a function to switch the value from the normal operation to the backwashing operation at an arbitrary time input by the input unit 41, comparing the value obtained by dividing the daily filtered water volume results by the correction coefficient Dc with the filterable water amount. is there. That is, the control unit 43 calculates the daily filtered water volume results for each day, corrects the latest daily filtered water volume results of the day corresponding to the day to determine switching with the correction coefficient Dc, and corrects the daily filtered water volume Compared with the filterable water volume at the time of judgment, when the filterable water volume exceeds the corrected daily volume filtered water volume results, the filtration operation is continued, and the filterable water flow becomes less than the corrected daily volume filtered water volume results Switch to backwash operation.

  Here, the correction coefficient Dc is a value that is stored in the storage unit 42 and that corrects the daily filtered water volume results to correspond to sudden changes in the amount of water used and changes in the raw water concentration. It can be set. Moreover, since the designated removal amount backwashing method requires daily filtered water volume results, for example, when the daily filtered water volume results can not be calculated after the water purifier 1 is installed, for example, in the present embodiment, one after installation Before the elapse of a week, the control unit 43 selects the time backwashing method, and after calculating the daily filtered water volume result, applies the designated removal amount backwashing method. For example, the correction coefficient Dc can be arbitrarily set in the range of 1.0 ≦ Dc ≦ 9.9. Further, the control unit 43 is configured to be able to correct the correction coefficient Dc. Specifically, the control unit 43 adds the correction value DE to the correction coefficient Dc in accordance with the filtering condition and the like. Here, the correction coefficient Dc + DE after correction is set in the range of 1.0 ≦ Dc + DE ≦ 9.9.

  Next, the operation of the control panel 17 regarding the control of the filtration operation and the backwash operation of the water purifier 1 will be described using the flowchart shown in FIG.

  As shown in FIG. 2, first, when an instruction for filtration operation is input from the input unit 41 or the like, the control unit 43 starts the filtration operation (step ST1). At this time, the flow rate detection unit 16 detects the flow rate, and the control unit 43 stores the integrated water amount.

  Next, the control unit 43 selects the time backwashing method, the removal amount backwashing method, or the designated removal amount backwashing method input by the input unit 41. Specifically, the control unit 43 first determines whether the time backwashing method is selected by the input unit 41 (step ST2). When the time backwashing method is selected (YES in step ST2), the process proceeds to step ST5 described later. If the time backwashing method is not selected (NO in step ST2), the control unit 43 then determines whether the removal amount backwashing method is selected (step ST3). If the removal amount backwashing method is selected (YES in step ST3), the process proceeds to step ST13 described later. If the removal amount backwashing method is not selected (NO in step ST3), the control unit 43 determines whether the designated removal amount backwashing method is selected (step ST4). When the designated removal amount backwashing method is selected (YES in step ST4), the process proceeds to step ST18 described later. If the designated removal amount backwashing method is not selected (NO in step ST4), the process returns to step ST2, and waits until one of them is selected, or the priority of the priority stored in advance in the storage unit 42. It is good also as composition which chooses a high method.

The operation of the control unit 43 when the time backwashing method is selected in step ST2 will be described.
First, the control unit 43 determines whether the current day of the week (X day of the week) and the current time are set in the calendar function and the 24-hour timer function (step ST5). If the current day of the week X and the current time have not been set (NO in step ST5), the process returns to step ST5. For example, when the current day of the week and the current time are not set to the calendar function and the 24-hour timer function, the information is notified to the outside. If the current day of the week (X day of the week) and the current time have been set (YES in step ST5), the control unit 43 stores the integrated filtered water volume I for each day of the week in the storage unit 42, ie, Recording of the integrated filtered water volume I for each day of the week is started (step ST6).

  Next, the control unit 43 determines whether the water purifier 1 has been operated continuously for 24 hours on the X day (step ST7). Here, when the water purifier 1 is operated continuously for 24 hours (YES in step ST7), the control unit 43 stores the integrated filtered water volume I (X) on the X day (step ST8), and the calculation unit 42a is subsequently performed. The daily filtered water volume results J (X) of the X day are calculated by the above (step ST9). When the water purifier 1 does not operate continuously for 24 hours (NO in step ST7), step ST8 and step ST9 are not performed, that is, integrated filtered water volume I (X) and daily filtered water volume results J (day X X) is not stored in the storage unit 42, and the process proceeds to the next step.

  Next, the control unit 43 determines whether or not the backwash permission time, which is the start time of the backwash operation, is set (step ST10). If the backwash permission time has not been set (NO in step ST10), the process returns to step ST6. When the backwashing permitted time is set (YES in step ST10), the control unit 43 determines whether the set backwashing permitted time has been reached (step ST11). If the set backwash permission time has not been reached (NO in step ST11), the process returns to step ST6. If the set backwash permission time has been reached (YES in step ST11), the control unit 43 starts a backwash operation as a function (2) (step ST12). After performing the backwashing operation and the cleaning operation for a predetermined time, the control unit 43 returns to step ST2 and restarts the filtration operation.

Next, the operation of the control unit 43 when the removal amount backwashing method is selected in step ST3 will be described.
First, the control unit 43 calculates the maximum filtered water volume Q1 (step ST13) and subtracts the flow rate of the raw water detected by the flow volume detecting unit 16 from the maximum filtered water volume Q1 to calculate the filterable water volume Q2. (Step ST14).

  Next, the control unit 43 determines whether Q2 = 0 is satisfied (step ST15). If Q2 = 0 is not satisfied (NO in step ST15), the process returns to step ST15. If Q2 = 0 is satisfied (YES in step ST15), the control unit 43 starts the backwash operation (step ST16). After the backwash operation, Q2 is reset to Q1 (step ST17), and the control unit 43 returns to step ST2 and starts the normal operation again.

Next, the operation of the control unit 43 when the designated removal amount backwashing method is selected in step ST4 will be described.
First, the control unit 43 determines whether the daily filtered water volume results J for all days have been calculated (step ST18). If the daily filtered water volume results J of all the days have not been calculated (NO in step ST18), the process moves to step ST5 to perform backwashing by the time backwashing method.

  When the daily filtered water volume results J of all days are calculated (YES in step ST18), the control unit 43 stores the raw water concentration in the storage unit 42, and can shift to the backwash arbitrarily set. It is determined whether the backwash permission time is set and stored in the storage unit 42 (step ST19). If one or both of the raw water concentration and the backwashing permission time are not stored (NO in step ST19), the process proceeds to step ST5 to perform backwashing by the time backwashing method. If the raw water concentration and the backwashing permission time are stored (YES in step ST19), the control unit 43 calculates the maximum filtered water amount Q1 (step ST20), and uses the maximum filtered water amount Q1 to make the filterable water amount Q2 Is calculated (step ST21).

  Next, the control unit 43 determines whether the water purifier 1 has been operated continuously for 24 hours on the X day (step ST22). Here, when the water purifier 1 is operated continuously for 24 hours (YES in step ST22), the control unit 43 stores the integrated filtered water volume I (X) on the X day (step ST23), and then the X day The daily filtered water volume result J (X) is calculated (step ST24). In addition, when the water purifier 1 does not operate continuously for 24 hours on the X day (NO in step ST22), the integrated filtered water volume I (X) and the daily filtered water volume results J (X) in step ST23 and step ST24 The next step is performed without storing the

  Next, the control unit 43 determines whether Q2 <(J (X + 1)) / Dc is satisfied, assuming that the day after X day is X + 1 (step ST25). If Q2 <(J (X + 1)) / Dc is satisfied (YES in step ST25), control unit 43 then determines whether the set backwash permission time has been reached (step ST26). . If the backwashing permission time has been reached (YES in step ST26), the control unit 43 switches the first three-way valve 33 and the second three-way valve 36 to control the water purifier 1 to start the backwashing operation (step ST27). ). After the backwashing, Q1 is reset to Q2 (step ST28), and the control unit 43 starts the filtration operation again.

  In step ST25, when Q2 <(J (X + 1)) / Dc is not satisfied (NO in step ST25), control unit 43 determines whether or not Q2 = 0 is satisfied before reaching the backwash permission time on X + 1 day. It is determined (step ST29). If Q2 = 0 is not satisfied before reaching the backwash permission time on the X + 1 day (NO in step ST29), the process returns to step ST20. If Q2 = 0 is satisfied before reaching the backwashing permission time on the X + 1 day (YES in step ST29), the correction value DE is added to the correction coefficient Dc (step ST30). Here, the correction value DE is stored in the storage unit 42, and is arbitrarily set in the range of 1.0 ≦ (Dc + DE) ≦ 9.9.

  Next, the control unit 43 determines whether Dd = 1 or Dd = 0 for the set value Dd arbitrarily set by the input unit 41 (step ST31). Here, when Dd = 1 in step ST31, the process proceeds to step ST27, and the forced backwash, that is, the backwash operation is forcibly performed regardless of the backwash permission time. If Dd = 0 in step ST31, the control unit 43 determines whether the backwash permission time has been reached (step ST32). Here, when the backwashing permission time has been reached (YES in step ST32), the process proceeds to step ST27. If the backwashing permission time has not been reached (NO in step ST32), the process returns to step ST32.

  According to the water purifier configured as described above, by selecting the backwashing method of the designated removal amount backwashing, the backwashing is performed at a designated time every predetermined day, that is, every day of the week in the present embodiment. Only when it is determined that the transition to the driving is necessary, the transition to the backwash operation is made. Thereby, compared with the conventional time backwashing which always starts backwashing operation at designated time, it is possible to reduce the frequency of transition to the backwashing operation. Therefore, the power consumption accompanying drive and stop of backwashing pump 14 can be reduced, that is, the running cost of water purifier 1 can be reduced.

  In addition, since the determination of the transition to the backwashing operation or the continuation of the filtration operation is started at an arbitrary time set by the user, the backwash operation can be performed by the user setting, for example, a late-night time zone with a small amount of water supply. It will be possible to avoid the risk of water shortage due to the transition to As a result, it is possible to avoid water interruption due to the transition to the backwashing operation during a large amount of water supply, for example, during the day, so there is no need to store excess treated water in advance, so the water receiving tank 13 has an appropriate volume. Well, it is possible to reduce the volume of the water receiving tank 13 compared to the prior art. As a result, the water receiving tank 13 can be miniaturized, and the manufacturing cost and the installation cost of the water receiving tank 13 can be reduced, so that the initial cost of the water purifier 1 can be reduced.

  Also, for example, when the filterable water volume becomes zero before the designated time for determining the transition to the backwashing operation or the continuation of the filtration operation due to a rapid increase in the amount of filtered water, the filtration immediately proceeds to the backwashing operation. Insufficient treatment water can be prevented from flowing into the water tank. In addition, the control unit 43 can cope with the sudden increase in the filtered water volume from the expected next day by performing correction to add the correction value DE to the correction coefficient Dc.

  The present invention is not limited to the above embodiment, and can be variously modified in the implementation stage without departing from the scope of the invention. For example, in the present embodiment, when the designated removal amount backwashing is performed, the daily filtered water volume result J is calculated for each day of the week, but the present invention is not limited thereto. For example, a holiday may be set as a designated date for calculating the daily filtered water volume result J.

  If the designated day is a public holiday, the integrated filtered water volume I is stored for each public holiday during operation of the water purifier 1 by time backwashing, and the daily volume filtered water volume results J of all public holidays are stored and updated every year. . After one year has passed from the start of operation of the water purifier by backwashing time, and after the daily filtered water volume results J for all holidays have been stored, operation of the water purifier 1 by backwashing of the designated removal amount becomes possible.

  Moreover, although the water purifier 1 demonstrated the example which selects the time backwashing system and the removal amount backwashing system by the input of the input part 41 in addition to the designated removal amount backwashing system, it is not limited to this, These systems The control unit 43 may be configured to select in combination. For example, it may be composition which uses two systems of a time backwashing method and a designated removal amount backwashing method, and in a designated removal amount backwashing method, a time backwashing method is carried out until daily filtered water volume results are calculated. Thereafter, the filter operation and the backwash operation may be switched only by the designated removal amount backwash method.

Further, in the above-described example, the control unit 43 has described the configuration in which the correction value DE is added to the correction coefficient Dc according to the filtering condition or the like, but is not limited thereto.
That is, the present invention is not limited to the above embodiment, and can be variously modified in the implementation stage without departing from the scope of the invention. In addition, the embodiments may be implemented in combination as appropriate, in which case the combined effect is obtained. Furthermore, various inventions are included in the above-described embodiment, and various inventions can be extracted by a combination selected from a plurality of disclosed configuration requirements. For example, even if some configuration requirements are deleted from all the configuration requirements shown in the embodiment, the problem can be solved, and if an effect is obtained, a configuration from which this configuration requirement is removed can be extracted as the invention.

  DESCRIPTION OF SYMBOLS 1 ... Water purification apparatus, 11 ... Pump apparatus, 12 ... Filtration unit, 13 ... Water tank, 14 ... Backwashing pump, 15 ... Chemical liquid injection apparatus, 16 ... Flow rate detection part, 17 ... Control board, 21 ... Pump, 22 ... Motor , 23: piping, 31: filtration tank, 32: suction pipe, 33: first three-way valve, 34: drainage pipe, 35: discharge pipe, 36: second three-way valve, 37: water supply pipe, 38: backwash piping, DESCRIPTION OF SYMBOLS 41 ... Input part, 42 ... Storage part, 42a ... Calculation means, 43 ... Control part, 51 ... Pump, 52 ... Motor, 53 ... Check valve, 54 ... On-off valve, 99 ... Signal line, 100 ... Supply source, 110 ... the drainage destination.

Claims (3)

Piping through which raw water supplied from a water source flows,
A flow rate detection unit that detects the flow rate of the raw water flowing through the pipe;
A filter tank having a filter material for capturing impurities contained in the raw water;
A storage unit in which the correction coefficient is stored;
The maximum filtered water volume obtained by dividing the volume of the impurity components which can be captured by the filter medium by the concentration of the impurity fluid contained in the raw water, the integrated water volume of the raw water circulated in a predetermined time measured by the flow rate detector The filterable water volume obtained by subtracting the integrated water volume from the maximum filtered water volume, and the daily filtered water volume performance obtained by calculating the average of the integrated water volume every predetermined number of days is calculated, and the filterable water volume is divided by a predetermined correction coefficient A control unit for continuing the filtration operation when exceeding the actual daily filtered water volume performance, and switching to the backwashing operation when the filterable water volume is lower than the daily filtered water volume actual divided by the correction coefficient;
Water purification equipment equipped with.   The control unit performs the backwash operation at a predetermined time before the storage unit stores the daily filtered water volume results for a predetermined number of days, and stores the daily filtered water volume results for a predetermined number of days The water purifier according to claim 1, characterized in that the backwashing operation is automatically switched afterward.   The water purifier according to claim 1, wherein the control unit performs the backwash operation when the filterable water amount becomes zero, and automatically corrects the correction coefficient.