JP2013054419A - Flow rate regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate a flow rate regulator with a flow rate as close to a target set flow rate as possible without stopping the flow rate regulator even in the case of the occurrence of abnormality in an on-off valve.SOLUTION: A flow rate regulator for controlling on-off valves 9A to 9C into different on-off patterns in accordance with a plurality of different set flow rates (or set related indexes) performs abnormality identification control for identifying an on-off valve where abnormality of opening/closing has occurred out of on-off valves 9A and 9C, and backup control for controlling the on-off valves 9A to 9C by an on-off pattern which includes an on/off state of the on-off valve where abnormality of opening/closing has occurred out of the on-off valves 9A to 9C and corresponds to a backup set flow rate (or a backup set related index) close to a set flow rate (or set related index) corresponding to a normal on-off pattern.

Description

  The present invention relates to a flow path control device in which a plurality of on-off valves having different water flow resistances are connected in parallel.

  Flow rate adjustment comprising a plurality of on-off valves connected in parallel to the flow path and having different water flow resistances, and a controller for controlling the on-off valves in different on-off patterns corresponding to a plurality of different set flow rates The apparatus is known from Patent Document 1 and Patent Document 2.

  In a flow control device such as Patent Document 1 or Patent Document 2, if the open / close pattern is changed to change the set flow rate, the open / close valve is not open or closed even if an open signal is given, or a close signal is given. May not be closed. Moreover, even when the set flow rate is not changed, an opening / closing abnormality may occur in the opening / closing valve.

  When an opening / closing abnormality occurs, there is a problem that the apparatus is operated at a flow rate different from a normal set flow rate (target set flow rate).

JP 2007-167744 A JP-A-1-189707

  The main problem to be solved by the present invention is to operate at a flow rate that is as close to the target set flow rate as possible without stopping the apparatus even if an abnormality occurs in the on-off valve. Further, the sub-task is to easily identify the on-off valve in which an abnormality has occurred during operation of the device.

  This invention is made in order to solve the said subject, Comprising: The invention of Claim 1 is provided in parallel with each other by the flow path, and the some on-off valve from which mutual water resistance differs And a controller for controlling the opening / closing valve in different opening / closing patterns corresponding to a plurality of different set flow rates (or setting-related indicators), wherein the controller has an opening / closing abnormality. A backup set flow rate that includes an abnormality specifying control procedure for specifying the open / close valve and an open / closed state of the open / close valve in which an open / close error has occurred, and is close to a set flow rate (or a setting-related index) corresponding to a normal open / close pattern Or a backup control procedure for controlling the on-off valve according to the on-off pattern of the backup setting related index).

  According to the first aspect of the present invention, it is possible to operate at a flow rate (or related index) close to a normal set flow rate (or setting related index) when an abnormality occurs in the on-off valve.

  The invention according to claim 2 comprises a flow meter for directly or indirectly detecting the flow rate of the flow path according to claim 1, and the abnormal identification control procedure by the controller is likely to occur. Based on the correspondence table between the valve opening / closing abnormality pattern and the flow rate detected by the flow meter (or detection-related index) when this opening / closing abnormality pattern occurs, the detected flow rate (or detection-related index) by the flow meter at the time of opening / closing abnormality The procedure is to identify the on-off valve in which an open / close abnormality has occurred.

  According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, an apparatus is provided on the basis of the detected flow rate (or detection-related index) without providing an abnormality detection sensor for each on-off valve. There is an effect that it is possible to identify the on-off valve in which an abnormality has occurred during the operation.

  According to the present invention, even when the on-off valve malfunctions, it is possible to operate at a flow rate as close to the target set flow rate as possible without stopping the device.

It is explanatory drawing explaining schematic structure of the filtration system provided with Example 1 of this invention. It is a flowchart figure explaining the control procedure of the filtration system provided with the Example 1. FIG. It is a graph explaining the relationship between the collection | recovery rate of the filtration system provided with the Example 1, and the opening / closing pattern of an on-off valve. The opening / closing abnormal pattern of the on / off valve that may be caused by the change in the recovery rate of the filtration system including the first embodiment, that is, the change of the opening / closing pattern of the on / off valve (change pattern NO. 1 to 6), and It is a chart explaining the correspondence between the recovery rate when it occurs and the backup setting recovery rate. The opening / closing abnormal pattern of the on / off valve that may be caused by the recovery rate change of the filtration system including the first embodiment, that is, the change of the opening / closing pattern of the on / off valve (change pattern No. 7 to 12), It is a chart explaining the correspondence between the recovery rate when it occurs and the backup setting recovery rate. It is a flowchart figure explaining the other control procedure of the filtration system provided with the Example 1. FIG. The correspondence between the opening / closing abnormal pattern of the on-off valve that may occur when the recovery rate of the filtration system including the first embodiment is 70%, the recovery rate when this open / close abnormal pattern occurs, and the backup set recovery rate It is a chart explaining.

  Next, an embodiment of the flow control device of the present invention will be described. The embodiment of the present invention is suitably implemented in a filtration system that adjusts the amount of drainage of a drainage line that drains a portion of the concentrated water from the filtration membrane unit out of the system.

  Next, an embodiment of the present invention will be described. A flow control device according to an embodiment of the present invention is provided by being connected to a flow path in parallel with each other, and a plurality of on / off valves having different water flow resistances and the on / off valves corresponding to a plurality of different set flow rates. And a controller for controlling the opening / closing pattern to different opening / closing patterns.

  A characteristic part of the embodiment of the present invention is that the controller includes an open / close state of the open / close valve in which an open / close abnormality has occurred, and is close to a set flow rate (or a setting-related index) corresponding to a normal open / close pattern. The on-off valve is controlled by an opening / closing pattern of a backup setting flow rate (or a backup setting-related index).

  Here, there are a case where the opening / closing abnormality occurs when the set flow rate is changed (the former) and a case where the open / close abnormality occurs during a constant flow rate control where the set flow rate is not changed (the latter). The normal opening / closing pattern is an opening / closing pattern after changing the set flow rate in the former case, and an opening / closing pattern before an opening / closing abnormality occurs in the latter case.

  In addition, “directly or indirectly detect the flow rate of the flow channel” means that the flow rate of the other flow channel is detected when the flow rate of the flow channel can be indirectly calculated from the flow rate of the other flow channel. Means that. For example, a filtration membrane part that removes impurities in the water supply, a treated water line that supplies treated water to the filtration membrane part, and a treated water line that supplies treated water that has passed through the filtration membrane part to equipment used And a drainage line for draining part of the concentrated water from the filtration membrane part to the outside of the system, and a reflux line for refluxing the remainder of the concentrated water to the upstream side of the filtration membrane part. When the flow rate of the line is controlled by the flow control device of this embodiment, “direct detection” is detected by a flow meter provided in the drainage line. Moreover, since the flow volume of the said drainage line can be calculated | required by the flow volume of the said to-be-processed water line and the flow volume of the said to-be-processed water line, the flow rate provided in the to-be-processed water line and the flow volume provided in the said to-be-treated water line The detection with the meter is referred to as “indirect detection”.

  The “related index of flow rate” means a numerical value that can be derived from the flow rate in relation to the flow rate, not the flow rate, and can be referred to as a related numerical value. For example, in the filtration system, the related index of the flow rate of the drainage line is a recovery rate. The recovery rate is defined as the ratio of the amount of permeated water to the sum of the amount of permeated water from the filtration membrane part (flow rate of the treated water line) and the amount of drained water outside the system (flow rate of the drainage line).

  Although each said on-off valve is not limited to the thing of a specific structure, it is comprised so that a mutual water flow resistance may differ. Different water flow resistances of the on-off valves can be realized by changing the diameters of the valve seats of the on-off valves. However, the present invention is not limited to this, and can be realized by a combination of an on-off valve and a constant flow valve mechanism as described in Japanese Patent Application Laid-Open No. 2006-292035. Specifically, each on-off valve has different water flow resistances by providing constant flow valve mechanisms such as orifices having different water flow resistances on the upstream side or downstream side of each on-off valve as the same on-off valve. The flow rates in the different opening / closing patterns of the opening / closing valves need to be different from each other.

  The “open / close pattern of the backup setting flow rate (or backup setting related index)” is limited to an open / close pattern that can be selected depending on the open / close state of the open / close valve in which an open / close abnormality has occurred. Therefore, an open / close pattern of the backup set flow rate (or backup setting related index) close to the normal set flow rate (or setting related index) is selected from the selectable open / close patterns.

  Further, “close to the set flow rate (or setting related index)” includes cases where the flow rate is larger than the set flow rate and cases where it is smaller. If there is any condition other than the condition “close to the set flow rate (or setting related indicator)”, the backup set flow rate (or backup setting related indicator) that is close to the range larger than the set flow rate (or setting related indicator) is selected. It is conceivable that a set flow rate close to a range smaller than the set flow rate is selected. The certain condition is, for example, a condition that the set collection rate is in a small range when the setting-related index is set to the set collection rate in the filtration system. The normal set flow rate can be referred to as a target set flow rate, and the normal setting related indicator can be referred to as a target setting related indicator.

  According to the flow control device of this embodiment, when an opening / closing abnormality of the on-off valve occurs, a backup set flow rate (or backup) close to the set flow rate (or setting-related index) on the premise of the opening / closing abnormality of the on-off valve. The flow rate can be controlled by setting related indicators).

In this embodiment, preferably, a flow meter for directly or indirectly detecting the flow rate of the flow path is provided, and the abnormality specifying control procedure by the controller may be caused by changing the opening / closing pattern or the like. Based on a correspondence table (open / close abnormality pattern table) of an opening / closing abnormality pattern of the on-off valve and a flow rate detected by the flow meter (or a detection-related index) when the opening / closing abnormality pattern occurs, a flow rate detected by the flow meter ( Or a procedure for identifying the open / close valve having an open / close abnormality from the detection-related index).

  According to the flow rate control device of this preferred embodiment, when the opening / closing abnormality of the opening / closing valve occurs, the opening / closing valve in which the opening / closing abnormality has occurred can be easily identified based on the opening / closing abnormality pattern table.

  As an open / close abnormality specifying means for specifying an open / close valve in which an open / close abnormality has occurred, a sensor for detecting an open / close abnormality of each open / close valve may be provided to specify an open / close valve with an open / close abnormality. However, this open / close abnormality specifying means complicates the device configuration and increases the cost of the open / close valve. On the other hand, according to this preferred embodiment, the on / off abnormality detecting sensor is not provided in each on / off valve in order to identify the on / off abnormality on / off valve, so that the device configuration can be simplified.

  As described above, the flow rate adjusting device according to the above embodiment includes a filtration membrane part that removes impurities in feed water, a treated water line that supplies treated water to the filtration membrane part, and the filtration membrane part. A treated water line that supplies permeated treated water to the equipment used, a drainage line that drains a portion of the concentrated water from the filtration membrane unit, and the remainder of the concentrated water is returned to the upstream side of the filtration membrane unit In the membrane filtration system provided with the reflux line to be made, it can be provided in the drainage line.

  The flow control device of the membrane filtration system is preferably configured such that a flow meter provided in the drainage line is a first flow meter, a second flow meter is provided in the treated water line or the treated water line, and the controller is A set flow rate (or a set flow rate of the drainage line corresponding to a normal open / close pattern, including an abnormality specifying control procedure for specifying the open / close valve in which the open / close abnormality has occurred, and an open / closed state of the open / close valve in which the open / close abnormality has occurred A backup control procedure for controlling the on-off valve is performed by an open / close pattern of a backup set flow rate (or backup set recovery rate) close to the set recovery rate.

  In this filtration system, the set recovery rate can be changed when the hardness leaks from the temperature of the water to be treated or the treated water or the soft water device provided upstream of the filtration membrane section. The change in the set recovery rate depending on the temperature of the water to be treated or the treated water can be configured to increase the set recovery rate as the temperature increases for different temperature zones. The change in the set recovery rate due to hardness leakage can be configured to change from the previous set recovery rate to a lower set recovery rate when a hardness leak occurs. In addition, as described in Patent Document 1, the set recovery rate can be changed by changing the drainage flow rate of the drainage line so that the treated water quality from the filtration membrane section becomes the target water quality or approaches the target water quality. This can be done by adjusting (the higher the electrical conductivity, the higher the drainage flow rate).

  The “open / close pattern of the backup set flow rate (or backup set recovery rate) close to the set flow rate (or set recovery rate) of the drainage line” in this filtration system is preferably set from the viewpoint of preventing clogging of the filtration unit. Select the backup setting flow rate (or backup setting recovery rate) in the range where the flow rate is high (the setting recovery rate is small). However, if the backup set flow rate (or backup set recovery rate) cannot be selected within a small recovery rate range due to restrictions on the open / close patterns that can be selected depending on the open / close state of the on / off valve in which an open / close error has occurred, It can comprise so that it may select in the range with a large ratio.

Further preferably, the abnormality specifying control procedure is performed when the opening / closing abnormality pattern of the opening / closing valve and the opening / closing abnormality pattern that may occur when the opening / closing pattern is changed and when the opening / closing pattern is not changed. Based on a correspondence table (open / close abnormality pattern table) with a recovery rate calculated based on the detected flow rate of the first flow meter (or the detected flow rates of the first flow meter and the second flow meter) The open / close valve having an open / close abnormality is identified from the recovery rate calculated based on the detected flow rate of the first flow meter (or the detected flow rate of the first flow meter and the second flow meter) at the time of the change. Configure.

  Next, a filtration system 2 equipped with a first embodiment of the flow control device 1 of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram for explaining a schematic configuration of a filtration system 2 including Embodiment 1 of the present invention. FIG. 2 is a flowchart illustrating a control procedure (at the time of recovery rate change control) of the filtration system 2 including the first embodiment. FIG. 3 is a chart for explaining the relationship between the recovery rate of the filtration system 2 including the first embodiment and the opening / closing pattern of the opening / closing valve. 4 and FIG. 5 show the opening / closing abnormal pattern of the opening / closing valve that may be generated by changing the opening / closing pattern of the opening / closing valve of the filtration system 2 including the first embodiment, and the recovery rate when the opening / closing abnormal pattern occurs. FIG. 6 is a flowchart for explaining another control procedure (at the time of constant recovery rate control) of the filtration system provided with the first embodiment. FIG. 7 shows an on-off valve opening / closing abnormal pattern that may occur when the recovery rate of the filtration system 2 including the first embodiment is 70%, a recovery rate when this open / close abnormal pattern occurs, and a backup set recovery rate. It is a chart explaining the corresponding relationship.

(Configuration of filtration system including Example 1)
Hereinafter, a filtration system 2 provided with a flow control device 1 according to Embodiment 1 of the present invention will be described in detail with reference to the drawings.

  In FIG. 1, the filtration system 2 includes a filtration membrane unit 3 that removes impurities in the feed water, a treated water line 4 that supplies treated water to the filtration membrane unit 3, and treated water that has passed through the filtration membrane unit 3. A treated water line 5 to be supplied to equipment used (not shown), a drain line 6 for draining a part of the concentrated water from the filtration membrane unit 3 to the outside of the system, and a remaining part of the concentrated water to the upstream side of the filtration membrane unit 3 A main part includes a recirculation line 7 for recirculation, a flow control device 1 provided in the drainage line 6, and a controller 8 for controlling the flow control device 1 and the like.

  The filtration membrane part 3 is for filtering impurities contained in the water to be treated of the water to be treated line 4 through the filtration membrane. The filtration membrane can be a reverse osmosis membrane (RO membrane), a nanofiltration membrane (NF membrane), or the like.

  The flow rate adjusting device 1 is provided in parallel with each other in the flow path, and a plurality of first on-off valves 9A, second on-off valves 9B, and third on-off valves 9C having different water flow resistances, and a plurality of different settings. The controller 8 is configured to control the on-off valves 9A, 9B, 9C in different opening / closing patterns corresponding to the recovery rate%. In the first embodiment, the water flow resistance is varied by providing constant flow valve mechanisms (not shown) having different water flow resistances on the downstream side of the on-off valves 9A to 9C.

  A set recovery rate table showing the relationship between the set recovery rate and the opening / closing pattern by the flow rate adjusting device 1 is shown in FIG. If the set recovery rate is determined, the open / close pattern of the open / close valves 9A, 9B, 9C is determined from FIG. The recovery rate of Example 1 can be adjusted in steps of 5% from 50% to 80%. In FIG. 3, “O” and “X” are “open” and “X” added to “open” and “X” added to “close” for easy understanding of “open” and “close”. There is no special meaning.

  A first flow meter 10 is provided in the drain line 6, a second flow meter 11 is provided in the treated water line 5, and a water supply pump 12 and a temperature sensor 13 are provided in the treated water line 4. The water supply pump 12 is for supplying treated water to the filtration membrane unit 3.

  The controller 8 inputs signals from the first flow meter 10, the second flow meter 11, the temperature sensor 12, etc., and opens and closes the flow control device 1, the feed water pump 12, and which open / close valve according to a previously stored control procedure. The display 14 that displays whether an abnormality has occurred is controlled. The control procedure includes a recovery rate changing procedure, an abnormality specifying control procedure, and a backup control procedure.

  The recovery rate changing procedure is a procedure for changing the set recovery rate. To change the set recovery rate, a recovery rate change table (not shown) in which the temperature detected by the temperature sensor 13 is associated with the set recovery rate is stored, and the set recovery rate corresponding to the detection value of the temperature sensor 13 is recovered. This is done by obtaining from the rate change table. As an example of the recovery rate change table, the temperature detected by the temperature sensor 13 is set to a plurality of temperature zones in the range of 15 ° C. to 35 ° C., and the set recovery rate for each temperature zone is set as the detection temperature increases. Is set to be a large value.

  The abnormality specifying control procedure is a procedure for specifying which open / close valve 9A, 9B, 9C has an open / close abnormality. Specifically, in the case of the set recovery rate change, the abnormality specifying control procedure is an open / close abnormality of the on-off valves 9A, 9B, and 9C that may be caused by a change of the set recovery rate (change of the on-off valve opening / closing pattern). Based on the opening / closing abnormality pattern table (FIGS. 4 and 5) showing the correspondence between the pattern and the detection recovery rate when this opening / closing abnormality pattern occurs, the opening / closing abnormality occurs from the detection recovery rate when the opening / closing pattern is changed. It is configured to identify the open / close valve.

  In the case of the set recovery rate constant control, the opening / closing abnormality pattern indicating the correspondence between the opening / closing abnormality patterns of the on-off valves 9A, 9B, 9C and the detected recovery rate when this opening / closing abnormality pattern occurs. Based on the table (a part of which is shown in FIG. 7), the open / close valve in which the open / close abnormality occurs is identified from the detection recovery rate when the open / close abnormality occurs. The detection recovery rate is calculated by R2 / (R1 + R2) based on the detected flow rate R1 of the first flow meter 10 and the detected flow rate R2 of the second flow meter 11.

  First, the opening / closing abnormality pattern table when the set collection rate is changed will be described. In this example 1, there are a total of 12 patterns for changing the set recovery rate, including 6 patterns of NO.1 to NO.6 shown in FIG. 4 and 6 patterns of NO.7 to NO.12 shown in FIG. To do. The open / close abnormality pattern in each set recovery rate change pattern is NO.1, 2 when the open / close change (open → closed or closed → open) occurs with only one open / close valve due to the change of the open / close pattern. There is one type of opening / closing abnormality pattern such as the above pattern. In addition, when a change of opening / closing (open → closed or closed → open) is caused by two on-off valves, three types of opening / closing abnormality patterns (abnormality 1 to abnormality 3) such as patterns of NO. ) Exists. In addition, when a change in opening / closing (open → closed or closed → open) occurs with three on / off valves, there are seven types of opening / closing abnormality patterns (abnormality 1 to abnormality 7) such as patterns of No. 7 and 8. . In FIGS. 4 and 5, “unopened” means an open abnormality that did not change to close even though a signal from open to closed was given, and “unclosed” It means a closing abnormality that did not change to open even though a signal from closing to opening was given. Further, “−” means that normal opening and closing has been performed.

Next, an opening / closing abnormality pattern table at the time of constant set recovery rate control will be described. As shown in FIG. 3, there are seven patterns of 50 to 80 in the set recovery rate%. The open / close abnormality pattern at each set recovery rate includes three types of open / close abnormality patterns (abnormality 1 to abnormality 3) when an open / close abnormality occurs (open → closed or closed → open) with only one open / close valve. When two open / close valves cause an open / close error (open → close or close → open), there are three types of open / close error patterns (abnormal 4 to 6), and the open / close error (open → close) occurs with three open / close valves. In the case of occurrence of (closed → open), there is one type of opening / closing abnormality pattern (abnormality 7). Eventually, since there are 7 open / close abnormal patterns at each set collection rate, there are a total of 7 × 7 = 49 open / close abnormal patterns. FIG. 7 shows an open / close abnormality pattern typically when the set recovery rate is 70%. The other set recovery rates are the same and are not shown.

  As shown in FIGS. 4 and 5, when the set recovery rate is changed, the detection recovery rate for the opening / closing abnormality pattern is different in each set recovery rate change pattern. For example, it is possible to specify which open / close abnormality pattern is present, and to specify which open / close valves 9A, 9B, and 9C are abnormal. This identification is performed by preliminarily storing an opening / closing abnormality pattern table in the controller 8 and calculating a detection recovery rate based on the detected flow rate R1 of the first flow meter 10 and the detected flow rate R2 of the second flow meter 11. It is configured as follows.

  In addition, as shown in FIG. 7, when the set recovery rate is constant, the detection recovery rate for the open / close abnormality pattern is different for each set recovery rate. It is possible to specify whether the opening / closing abnormality pattern is present, and it is possible to specify which opening / closing valve 9A, 9B, 9C is abnormal.

  The backup control procedure includes the open / close state of the open / close valves 9A, 9B, 9C in which the open / close abnormality has occurred, and the open / close valve 9A has an open / close pattern with a backup recovery rate close to the set recovery rate corresponding to the normal open / close pattern. , 9B, 9C are controlled. An example of the backup control procedure is shown in FIG.

  The backup setting recovery rate can be obtained as follows. That is, when the set recovery rate is changed, the open / close pattern including the open / close state of the open / close valves 9A, 9B, 9C in which the open / close abnormality has occurred is selected from the set recovery rate table of FIG. . Next, a set recovery rate close to the changed set recovery rate is obtained from the selected opening / closing pattern in a range smaller than the changed set recovery rate, and this is set as the backup set recovery rate. If the backup set flow rate cannot be selected in a range where the set recovery rate is small, a recovery rate close to the changed set recovery rate is obtained in a range where the recovery rate is large, and this is set as the backup set recovery rate.

  Further, the backup set recovery rate can be determined at the same time as when the set recovery rate is constant.

  The procedure for obtaining the backup setting recovery rate described above can be executed every time an abnormality occurs. In the first embodiment, the backup setting recovery rate corresponding to the opening / closing abnormality pattern is calculated in advance, and FIG. As shown in FIG. 5 and FIG. 7, it is stored in the open / close abnormality pattern table.

  The backup set recovery rate can be obtained by the following procedure. That is, first, a temporary setting recovery rate that is 5% lower than the normal setting recovery rate is set, and it is determined whether or not this temporary setting recovery rate includes the open / close state of the on-off valves 9A, 9B, 9C in which the open / close abnormality has occurred. If it is included, the provisional recovery rate is set as the backup recovery rate. If not, a temporary recovery rate that is 5% lower than the temporary recovery rate is set, and whether or not the temporary recovery rate includes the open / closed state of the on-off valves 9A, 9B, and 9C in which the open / close abnormality has occurred. If it is determined and included, the provisional recovery rate is set as the backup recovery rate. Thereafter, this process is repeated within a range smaller than the normal set recovery rate. If the backup set recovery rate cannot be set in this process, the temporary set recovery rate is set in increments of 5% on the higher side than the normal set recovery rate, and this temporary set recovery rate is the opening / closing valve 9A in which the opening / closing abnormality has occurred. , 9B, 9C are determined whether or not the open / closed state is included. If not included, the provisional recovery rate is increased by 5% to obtain the backup recovery rate.

(Operation of Filtration System 2 with Example 1)
Operation | movement of the filtration system 2 provided with Example 1 provided with the above structure is demonstrated. In the filtration system 2, the quality of the water to be treated (raw water) at a place where the filtration system 2 is installed is measured in advance, and a recovery rate corresponding to the measurement result is initially set as a set recovery rate. Then, the controller 8 opens and closes the on-off valves 9A, 9B, and 9C according to the on-off pattern shown in FIG.

  First, the operation when the set collection rate is changed will be described. When the temperature detected by the temperature sensor 13 changes, the set recovery rate is changed as described above. Assume that the change pattern No. 8 in FIG. Signals for switching the first on-off valve 9A and the second on-off valve 9B from closed to open and the third on-off valve 9C from open to closed are given to the on-off valves 9A, 9B, and 9C. Referring to FIG. 2, controller 8 determines that there is a change in the detection recovery rate in process step S1 (hereinafter, process step SN is simply referred to as SN), and proceeds to S2. In S2, it is determined whether the detected recovery rate is outside the normal range. For example, when it exceeds 5% of the target recovery rate, it is determined to be out of the normal range. Now, it is determined that it is out of the normal range, and the process proceeds to S3.

  In S3, it is determined whether or not the abnormal on-off valve can be identified from the changed detection recovery value. That is, it is determined whether or not an abnormality has occurred in the on-off valves 9A, 9B, and 9C, and at the time of abnormality determination, it is specified which on-off valves 9A, 9B, and 9C are abnormal in opening and closing.

  Assume that the detection recovery rate calculated based on the detected flow rates of the first flow meter 10 and the second flow meter 11 is 50%. Based on the detection recovery rate of 50%, the controller 8 determines that the opening / closing abnormality pattern is abnormality 2 in the opening / closing abnormality pattern table of FIG. 5 and that the third opening / closing valve 9C is abnormal. In this case, the abnormal on-off valve can be specified, YES is determined in S3, and the process proceeds to S4.

  In S4, the display unit 14 is notified of the abnormality 2, and the backup setting recovery rate 60% previously determined corresponding to the abnormality 2 from FIG. 5 is set as the backup setting recovery rate.

  Next, in S5, the on-off valves 9A, 9B, and 9C are opened and closed with an on-off pattern corresponding to the set backup setting recovery rate of 60%. As shown in FIG. 3, the opening / closing pattern with a recovery rate of 60% is the first opening / closing valve 9A: open, the second opening / closing valve 9B: closed, and the third opening / closing valve 9C: open. The second on-off valve 9B is changed from open to closed.

  Thus, when the third on-off valve 9C is in an abnormal opening / closing state, the detection recovery rate becomes 50% if nothing is done, whereas the recovery rate becomes 60% by setting the backup recovery rate. Therefore, it is possible to operate at a recovery rate close to 65% after the change, and to reduce the amount of drainage. Moreover, since the backup set recovery rate is set in a range smaller than the changed set recovery rate of 65%, the clogging of the filtration membrane unit 3 can be reduced as compared with the case where the backup set recovery rate is set in a large range.

In addition, in the abnormality 2 of the open / close abnormality pattern of FIG. 5, the backup setting recovery rate: 60 (or 70) (or 70) can be selected as 70% as the backup setting recovery rate close to the changed setting recovery rate of 65%. It means that. The same applies to the backup setting recovery rate: ΔΔ (or □□) of the other opening / closing abnormality patterns in FIGS. 4 and 5. However, in the system of the first embodiment, the backup setting recovery rate 70% is not in a range smaller than the target recovery rate 65% after the change, and thus is not set as the backup setting recovery rate. In addition, in the column of the backup setting recovery rate at the time of abnormality in FIGS. 4 and 5, the shaded portion is set within a range that is close to the set recovery rate after the change and smaller than the set recovery rate after the change. Shows the backup setting recovery rate.

  Next, the operation when the set recovery rate is constant will be described with reference to FIGS. In FIG. 6, the same SN as in FIG. 2 performs the same processing. Now, assume that the set recovery rate is 70% and an on / off abnormality of the on-off valve has occurred. Then, referring to FIG. 6, in S2, it is determined whether or not the detection recovery rate is outside the normal range. If it is now outside the normal range and YES is determined, the process proceeds to S3.

  In S3, it is determined whether or not the abnormal on-off valve can be identified from the changed detection recovery value. Assume that the detection recovery rate calculated based on the detected flow rates of the first flow meter 10 and the second flow meter 11 is 50%. Based on the detection recovery rate of 50%, the controller 8 determines that the opening / closing abnormality pattern is abnormality 4 in the opening / closing abnormality pattern table of FIG. 7, and that the first opening / closing valve 9A and the second opening / closing valve 9B are abnormal. . In this case, the abnormal on-off valve can be specified, YES is determined in S3, and the process proceeds to S4.

  In S4, the display unit 14 is notified of the abnormality 4, and the backup setting recovery rate 65% previously determined corresponding to the abnormality 4 from FIG. 7 is set as the backup setting recovery rate.

  Next, in S5, the on-off valves 9A, 9B, and 9C are opened and closed with an on-off pattern corresponding to the set backup setting recovery rate of 65%. As shown in FIG. 3, the opening / closing pattern with a recovery rate of 65% is the first opening / closing valve 9A: open, the second opening / closing valve 9B: open, and the third opening / closing valve 9C: closed. The third on-off valve 9C is changed from open to closed.

  Thus, when the first on-off valve 9A and the second on-off valve 9B are in an abnormal opening / closing state, the detection recovery rate becomes 50% if nothing is done, whereas the recovery rate of 65% is achieved by setting the backup recovery rate. Become a rate. Therefore, it is possible to operate at a recovery rate close to the normal set recovery rate of 70% and reduce the amount of drainage. Further, since the backup set recovery rate is set in a range smaller than the normal set recovery rate of 70%, the clogging of the filtration membrane unit 3 can be reduced as compared with the case where the backup set recovery rate is set in a large range.

  2 or 6, if NO is determined in S3, that is, if the abnormal on-off valve cannot be specified, it is determined that the detection recovery rate has changed due to a failure of the flow meters 10 and 11, and the process proceeds to S6. Thus, the opening / closing pattern of the abnormal opening / closing valve cannot be specified (in this embodiment, the recovery rate when hardness leakage occurs on the upstream side of the filtration membrane portion 3: the opening / closing pattern corresponding to the recovery rate of 50%). If NO is determined in S2, the process proceeds to S7, and the opening / closing pattern at the time of determination is continued.

  According to the filtration system 2 including the first embodiment described above, when the on / off valves 9A, 9B, and 9C are abnormally opened and closed, it is possible to operate at a backup set recovery rate close to the normal set recovery rate. Further, when the opening / closing abnormality of the opening / closing valves 9A, 9B, 9C occurs, each of the opening / closing valves 9A, 9B, 9C in which the opening / closing abnormality has occurred is determined based on the opening / closing abnormality pattern table shown in FIG. The on / off valve can be easily identified without providing a sensor for detecting an abnormality.

  The present invention is not limited to the first embodiment, and various modifications can be made. For example, in the filtration system 2 of the first embodiment, the recovery rate is obtained by the first flow meter 10 and the second flow meter 11, but a third flow meter (not shown) provided in the treated water line 4 and the first flow meter 10 are used. The recovery rate can be obtained from the detected flow rate of the single flow meter 10. The recovery rate can be obtained from the detected flow rate of the second flow meter 11 and the third flow meter.

Furthermore, the recovery rate is a related index that can be derived from the flow rate of the drainage line 6, but the controller 8 uses the flow rate of the drainage line 6 instead of the recovery rate to allow the controller 8 to open / close valves 9A, 9B, The on-off valves 9A, 9B, and 9C can be controlled by an open / close pattern of a backup set flow rate that includes an open / close state of 9C and is close to the set flow rate corresponding to the normal open / close pattern. In this case, the flow rate of the drain line 6 is configured to be detected directly by the first flow meter 10. However, the flow rate of the drainage line 6 can be determined indirectly from the detected flow rate by the second flow meter 11 and the detected flow rate by the third flow meter. Moreover, the flow control device 1 of the present invention can be applied to systems and devices other than the filtration system 2.

1 Flow control device 2 Filtration system 6 Drainage line (flow path)
8 Controller 9A First open / close valve (open / close valve)
9B Second open / close valve (open / close valve)
9C Third open / close valve (open / close valve)
10 First flow meter (flow meter)
11 Second flow meter (flow meter)

Claims (2)

A plurality of on-off valves provided in parallel to each other in the flow path and having different water flow resistances, and the on-off valves are controlled in different on-off patterns corresponding to a plurality of different set flow rates (or setting-related indicators). A flow control device comprising a controller,
The controller includes an abnormality specifying control procedure for specifying the opening / closing valve in which an opening / closing abnormality has occurred, and an opening / closing state of the opening / closing valve in which an opening / closing abnormality has occurred, and a set flow rate corresponding to a normal opening / closing pattern ( Or a backup control procedure for controlling the on-off valve by an opening / closing pattern of a backup set flow rate (or backup setting-related index) close to a setting-related index). A flow meter for directly or indirectly detecting the flow rate of the flow path;
The abnormality specifying control procedure by the controller is based on a correspondence table of an opening / closing abnormality pattern of the on-off valve that may occur and a detected flow rate (or a detection-related index) by the flow meter when the opening / closing abnormality pattern occurs. The flow control device according to claim 1, wherein the flow control device is a procedure for identifying the on-off valve in which an open / close abnormality has occurred from a flow rate (or a detection-related index) detected by the flowmeter at the time of an open / close abnormality.

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