JP5093755B2 - Cooperation control method - Google Patents

Description

  The present invention relates to a cooperative control method applicable to a membrane filtration device or the like.

  In recent years, in facilities such as department stores, supermarkets, hotels, hospitals, schools, and entertainment venues, membrane filtration devices that purify groundwater have been installed for the purpose of reducing water charges and securing water supply lifelines in the event of natural disasters. Increasing use of water for drinking and facility water. As said membrane filtration apparatus, the thing of patent document 1 is known.

  In Patent Document 1, when the hollow fiber membrane module is used for a long time, the hollow fiber membrane may be damaged or broken due to deterioration or clogging. For this reason, the hollow fiber membrane module is configured to perform extrusion cleaning and bubbling cleaning. When performing the above-mentioned extrusion cleaning and bubbling cleaning in a system comprising a plurality of membrane filtration devices equipped with membrane modules, until now, there has been a demand for washing simultaneously from a plurality of membrane filtration devices using a large-capacity air compressor. It was configured to be able to cope with any cases. Subsequent development of the membrane filtration system revealed that a system with a small-capacity compressor for each membrane filtration device and a blower shared by each membrane filtration device was superior from the standpoint of cost reduction. did.

  When such a shared device such as a blower is shared and used by a plurality of devices such as a membrane filtration device, control (cooperation control) is required so that the shared device is not used at the same time. As this cooperative control method, a device for managing the exclusive use of the shared device is generally provided, and this management device generally permits or prohibits the exclusive use of the shared device to each device (see, for example, Patent Document 2).

  In the cooperative control method using such a management device, the cooperative control cannot be performed if the management device fails. Further, in order for the management device to determine the priority of each device, it is necessary to obtain detailed information from each device, and it is necessary to construct a data communication network (line) such as a PLC network between each device and the management device. there were.

JP 2006-175391 A Japanese Patent No. 3876818

  The problem to be solved by the present invention is to enable easy cooperative control without a management device without requiring an advanced data communication network.

This invention was made in order to solve the said subject, The invention of Claim 1 is as follows.
A cooperative control method for controlling not to use shared devices shared by multiple devices at the same time,
Each device shares one exclusive signal, and when at least one device turns on the exclusive signal, the device includes an exclusive signal sharing means for inputting the exclusive signal ON to each device,
Each device that wants to use the shared device starts timing the first waiting time when the exclusive signal is turned from ON to OFF by another device, and the exclusive signal is turned OFF after the first waiting time has elapsed. Turn on the exclusive signal to occupy the shared device ,
The first waiting time is set to a different value in each device,
Each device that wants to use the shared device temporarily turns off the exclusive signal, and starts counting its first waiting time after the exclusive signal is turned off. A step to start timing the waiting time;
Each of the devices that want to use the shared device includes a step of occupying the shared device by turning on the exclusive signal when the exclusive signal is not turned on within its first waiting time .

According to the first aspect of the present invention, when the exclusive signal is confirmed from ON to OFF, it is possible to perform cooperative control without simultaneously using the shared device by a simple configuration in which the use of the shared device is postponed for the first waiting time. Become. In addition, even if a certain device fails, the remaining devices can perform cooperative control. Furthermore, the use priority of the shared device can be set by changing the value of the first waiting time.

The invention according to claim 2 is characterized in that, in claim 1 , the first waiting time is set based on a priority margin of each device and / or a different constant set in each device. Yes.

According to the invention of claim 2 , in addition to the effect of the invention of claim 1 , the use of the shared device is performed by setting the first waiting time and / or based on different constants of the devices. There is an effect that the priority can be easily set.

According to a third aspect of the present invention, in the first or second aspect , the exclusive signal sharing means closes the exclusive signal line and closes the exclusive signal line when the exclusive signal is turned ON, and turns off the exclusive signal line. In this case, the switch is configured to include a switch that opens and opens and a detection unit that detects a short circuit and an open of the exclusive signal line.

According to the invention of claim 3 , in addition to the effect of the invention of claim 1 or 2 , the exclusive signal sharing means need not take much consideration into noise and signal attenuation, and as a result, simple. There exists an effect that it can be set as the thing of a structure.

According to the invention, without the need for advanced data communication network, without managing apparatus, together to be able to provide a cooperative control method capable cooperative control easily, different values of the first waiting time By doing so, it is possible to set the priority of use of the shared device.

  Next, an embodiment of the present invention will be described. The cooperation control method according to the present invention is applied to an apparatus in which a plurality of apparatuses share and use a shared device. Here, cooperative control refers to control for controlling not to use shared devices shared by a plurality of devices.

  An embodiment of the present invention is a cooperative control method for controlling not to simultaneously use a shared device that is shared and used by a plurality of devices, wherein each device shares one exclusive signal, and at least one device When the exclusive signal is turned ON, the exclusive signal sharing means for inputting the exclusive signal ON to each of the other devices is provided, and each device that wants to use the shared device has the exclusive signal changed from ON to OFF by another device. Occasionally (including after one-shot ON), start counting the first waiting time, and after the first waiting time has elapsed, turn on the exclusive signal under the condition that the exclusive signal is OFF to occupy the shared device It is the cooperation control method characterized by this. Here, “exclusive signal ON is input” can be rephrased as “exclusive signal ON is confirmed”.

  In this embodiment, when one device turns on an exclusive signal by the exclusive signal sharing means, an exclusive signal ON is input to the other devices, and one device can occupy a shared device. The devices cannot occupy the shared device. Each device that wants to use the shared device does not have the exclusive signal turned on by another device, and when it is in the OFF state, turns on the exclusive signal and occupies the shared device. When the exclusive signal is turned on by another device, the device postpones the first waiting time for giving up the use of the shared device from the time when the exclusive signal is turned off. The exclusive signal is turned ON under the condition that the exclusive signal is OFF to occupy the shared device. Here, while the exclusive signal is ON, the timing of the first waiting time is reset and is stopped at zero. The first waiting time is preferably a different value between the devices, but may be the same value.

  According to this embodiment, when the use request for the shared device collides, the exclusive signal control function by the exclusive signal sharing means and the use of the shared device for the first waiting time when the exclusive signal is confirmed to be ON. With the function to postpone, it is possible to perform cooperative control without using the shared device at the same time. In addition, even if a certain device fails, it is possible to perform cooperative control with the remaining devices without affecting the cooperative control.

  The embodiment described above is preferably developed into the following two modes. The first aspect is that, in the embodiment, the first waiting time is set to a value different from each other in each device, and each device that wants to use the shared device temporarily turns off the exclusive signal and turns it off. And starting the timing of its first waiting time after the exclusive signal is turned off, and the steps of starting the counting of the first waiting time of other devices, and each device that wants to use the shared device, And a step of occupying the shared device by turning on the exclusive signal when the exclusive signal does not turn on within its first waiting time.

  In the first aspect of the cooperative control method, the first waiting time is set to a different value in each device. Then, after confirming that the exclusive signal is turned off, each device that wants to use the shared device temporarily turns on and turns off the exclusive signal, and starts measuring its own first waiting time. At the same time (in synchronization with ON → OFF), the other devices also start timing their own first waiting time. Thereafter, each device that wants to use the shared device dedicates the shared device by turning on the exclusive signal when the exclusive signal does not input ON within its first waiting time.

  In this first aspect, the device with the short first waiting time can preferentially occupy the shared device. As a result, the use priority order of the shared devices can be set by changing the value of the first waiting time.

In the first aspect, the first waiting time can be set based on both the priority margin of each device and different constants set for each device. The priority margin means the degree to which the priority of use of the shared device may be lowered. The priority margin is preferably set based on a signal from the sensor provided with information for determining the priority margin in each of the devices. The constant is a value uniquely set for each device in order to make the first waiting time different. The larger the constant is, the longer the first waiting time is. In this first aspect, when two or more devices have exactly the same priority margin, the exclusive signal is simultaneously turned ON (collision occurs). As a countermeasure, the first waiting time is shifted little by little according to the constant to avoid a collision.

  Thus, the first waiting time can be set based on the priority margin of each device and different constants set for each device. As a result, it is possible to easily set the use priority of the shared device.

  The second aspect is that in the above-described embodiment, each device that wants to use the shared device temporarily turns on and turns off the exclusive signal, starts counting its first waiting time, and other devices. In addition, each device that wants to use the shared device turns on an exclusive signal after the waiting time has elapsed, and detects collisions of different lengths between the devices. A step of setting a second waiting time for the second waiting time, and each device that wants to use the shared device turns off the exclusive signal after the second waiting time has elapsed, and the exclusive signal remains on Is detected, the occupation of the shared device is postponed until the exclusive signal is turned off, and when the exclusive signal is detected, the exclusive signal is turned on to dedicate the shared device. A cooperative control method characterized by comprising the steps.

  In this second aspect, each of the devices that want to use the shared device first turns on the exclusive signal temporarily without confirming the exclusive signal, then turns it off, and confirms that the exclusive signal is turned off. Start timing the first waiting time. At the same time as the exclusive signal is turned ON, other devices also start counting their first waiting time. Then, each device that wants to use the shared device turns on the exclusive signal after the first waiting time has elapsed, sets a second waiting time, starts measuring the second waiting time, and waits. Thereafter, each device that wants to use the shared device turns off the exclusive signal after the second waiting time has elapsed. When it is confirmed that the exclusive signal remains ON, it is determined that the use request is a collision and the exclusive signal is turned off until the exclusive signal is turned off to postpone occupying the shared device. On the contrary, when the exclusive signal is detected to be OFF, the exclusive signal is turned ON to dedicate the shared device.

  In the second aspect, unlike the first aspect, the first waiting time may be the same value if the first waiting time is determined only by the priority margin. Then, since a collision occurs, the collision is checked based on a second waiting time calculated by a constant uniquely set for each device, and if there is a collision, the exclusive signal is turned on.

  According to the cooperation control method of the second aspect, since the device with a long second waiting time can preferentially use the shared device, by changing the value of the second waiting time, It is possible to set the use priority order of shared devices.

  Here, each component of the embodiment will be described. The device is not limited to a specific device as long as it is a device that is shared and used without simultaneously using a shared device. Similarly, the shared device is not limited to a specific device. For example, when the device is a membrane filtration device, the shared device can be a blower that cleans the membrane filtration device.

The exclusive signal sharing means is a means having a function in which each device shares one exclusive signal, and when at least one device turns on the exclusive signal, the exclusive signal ON is input to the other devices. . The exclusive signal sharing means preferably includes a pair of exclusive signal lines, a switch that closes when the exclusive signal is turned on to short-circuit the exclusive signal line, and opens and opens when turned off, and the exclusive signal line And detecting means for detecting short circuit and open circuit. With this configuration, the exclusive signal sharing unit can be easily configured without using a communication line. Each of the switches and a part of the detection means are provided in a controller of each device, but may be housed in a control device such as a control panel common to each device.

  The said switch is not limited to the contact controlled by a relay, It can be set as the switch which consists of semiconductors. Further, the detection means only needs to have a function of detecting short-circuiting and opening of the exclusive signal line, and a detection unit comprising a combination of a light-emitting diode and a light-receiving element that detects light emission caused by current flowing therethrough. However, the present invention is not limited to this.

  Hereinafter, a specific embodiment 1 of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a membrane filtration system in which a cooperative control method according to Embodiment 1 of the present invention is implemented, and FIG. 2 is a schematic configuration diagram illustrating details of a main part of the filtration system. FIG. 4 is a schematic configuration diagram of the exclusive signal sharing apparatus of the first embodiment, and FIG. 4 is a flowchart for explaining the processing procedure of the cooperative control method executed in each membrane filtration apparatus of the first embodiment. FIG. 5 is a time chart illustrating the operation of the first embodiment.

  Referring to FIG. 1, the membrane filtration system is composed of a plurality of membrane filtration devices 1, 1,... Connected in parallel to each other (in the first embodiment, three from No. 1 to No. 3). In each membrane filtration device 1, treated water supply lines 3, 3,... Equipped with a treated water supply pump 2 and treated water lines 4, which supply filtered treated water to treated water tanks (not shown). Are connected to first gas supply lines 6, 6,... To which air for bubbling cleaning is supplied by a blower (blower) 5 serving as a shared device.

  Referring to FIG. 2, each of the membrane filtration devices 1 includes a plurality of (only one shown in the figure) hollow fiber separation membrane portions 7 connected in parallel to each other, and an air pushing compressor (air pump or An air compressor) 8 and a controller 9 shown in FIG. 1 for controlling the compressor 8 and the like. Referring to FIG. 1, the controllers 9 are connected to each other via a signal line L so that signals can be exchanged with each other.

  Each of the hollow fiber separation membrane portions 7 is assembled by housing the hollow fiber membrane module 10 in a pressure-resistant vessel (container) 11 and sealing it with a cap member 12. Each of the hollow fiber membrane modules 10 has a plurality of hollow fiber membranes (not shown) suspended in a U-shape in a resin outer cylinder (not shown) formed to allow water to pass. A portion is sealed at one end side of the outer cylinder, and the sealed side is mounted so as to communicate with the inside of each cap member 12. You may seal the both ends of each said hollow fiber membrane by the both ends side of the said outer cylinder. That is, in the state where the hollow fiber separation membrane portions 1 are assembled, the vessel (container) 11 and the cap member 12 are separated by the hollow fiber membranes. Therefore, when the water to be treated is supplied into each vessel 11, the filtration proceeds from the outside to the inside of each hollow fiber membrane, and the permeated water is collected in each cap member 12.

The bottom of each vessel 11 is provided with an air diffuser tube (also referred to as an air supply tube) 13 provided with one or a plurality of holes (not shown) for air ejection. Gas supply lines 6 are connected to each other. The to-be-treated water supply line 3 branches according to the number of the membrane filtration devices 1, and each branch line is provided with a first on-off valve 14. In addition, the treated water lines 4 are connected to the cap members 12, respectively. The treated water lines 4 are gathered on the downstream side, and the membrane filtration devices 1 are located upstream of the gathered portion. A second on-off valve 15 is provided for each.

  Each filtration device 1 includes the compressor 8, and is connected to the treated water line 4 and the second gas supply line 16 on the upstream side of the second on-off valve 15. The second gas supply line 16 is provided with a third on-off valve 17 and a pressure detector 18 in order from the compressor 8 side. Further, a fourth on-off valve 19 is provided between the collecting portion of each first gas supply line 6 and the blower 5.

  Further, a drain line 20 is connected to each treated water supply line 3 of each membrane filtration device 1, and each drain line 20 is provided with a fifth on-off valve 21. The treated water line 4 connected to each membrane filtration device 1 is connected to a pressure regulation line 22 for each membrane filtration device 1, and a sixth on-off valve is connected to each pressure regulation line 22. 23. Further, an overflow line 32 is connected to the upper portion of the vessel 11, and the overflow line 32 is provided with a seventh on-off valve 33.

  Each of the controllers 9 is based on a pre-stored processing procedure, and the compressor 8, the first on-off valve 14, the third on-off valve 17, and the fourth on-off valve 19 built in each membrane filtration device 1. The fifth on-off valve 21, the sixth on-off valve 23, and the seventh on-off valve 33 are controlled, and the blower 5 provided outside each membrane filtration apparatus 1 is controlled. In addition, each of the membrane filtration devices 1 shares one exclusive signal with each of the controllers 9, and when at least one of the membrane filtration devices 1 turns on the exclusive signal, it is exclusive to the other membrane filtration devices 1. An exclusive signal sharing device 24 (see FIG. 3) to which the signal ON is input is provided.

  Referring to FIG. 3, the exclusive signal sharing device 24 is provided in each controller 9 with a pair of exclusive signal lines 25 and 25, and is closed when the exclusive signal is turned ON, and the exclusive signal lines 25 and 25 are closed. Is configured by a switch 26 that opens and opens when it is turned off, and a detection device 27 that detects short-circuiting and opening of the exclusive signal lines 25 and 25. Each switch 26 is connected to the exclusive signal lines 25 and 25 through a pair of first signal lines 28 and 28, respectively. Each switch 26 includes a relay and a contact whose opening / closing is controlled by the relay (not shown).

  The detection device 27 includes a detection unit 30 provided in the controller 9 and connected to the exclusive signal lines 25 and 25 through a pair of second signal lines 29 and 29. The exclusive signal sharing device 24 includes a DC power supply 31. The power source 31 -exclusive signal line 25 (upper side in the figure) -first signal line 28 (right side in the figure) -switch 26 -first signal line 28 (left side in the figure) -exclusive signal line 25 (lower side in the figure) -second Signal line 29 (left side in the figure) -detector 30-second signal line 29 (right side in the figure) -power supply 31 determines whether the exclusive signal is turned on or off by the detector 30 depending on whether or not current flows through the closed circuit. And are input. The detection unit 30 includes a light emitting diode provided in the closed circuit and a light receiving element (none of which is shown) that receives light emitted from the light emitting diode. When the current flows through the light emitting diode, the light receiving element can confirm the exclusive signal ON, and when the current does not flow, the light receiving element can confirm the exclusive signal OFF.

  And in the said process procedure, each said membrane filtration apparatus 1 based on the waiting time calculation procedure which calculates a transfer waiting time (1st waiting time) using the said exclusive signal sharing apparatus 24, and a 1st waiting time. Includes a cooperative control procedure (which can be referred to as an exclusive processing determination procedure) for performing cooperative control for controlling the fans 5 not to be used at the same time.

In the first embodiment, the waiting time calculation procedure is configured to calculate the first waiting time T1 by the following equation (1).
T1 = (1 + priority margin × maximum number of vehicles + ID) × K (Formula 1)

  The priority margin indicates the degree to which the priority may be lowered, and is set in the clogged state of the hollow fiber membrane module 1 of each membrane filtration device 1. The priority margin is set to a lower value as clogging increases, and to a higher value as it decreases. In the first embodiment, discrete values (integers) such as 0, 1, 2, 3,. In the clogged state, the pressure detector 18 detects the differential pressure between the treated water inlet and the treated water outlet of each membrane filtration device 1. The clogging state can be detected at the permeation flow rate. This permeation flow rate can be determined from the flow rate, inlet pressure, outlet pressure, and water temperature of the hollow fiber membrane module.

  The ID is a constant that is unique to each of the membrane filtration devices 1. In Example 1, 1, 2, and 3 are assigned to the first to third units of the membrane filtration device 1, respectively. This ID can be 0, 1, 2; In Equation 1, K is a coefficient, which is 1 in the first embodiment.

  In the cooperative control procedure, each membrane filtration device 1 that wants to use the blower 5 starts measuring the first waiting time T1 when the exclusive signal is turned from ON to OFF by another membrane filtration device 1, FIG. 4 shows a control program for occupying the blower 5 by turning on the exclusive signal under the condition that the exclusive signal is OFF after the first waiting time T1 has elapsed.

  In this program, the first waiting time T1 is basically set to a different value (length) between the membrane filtration devices 1, and the membrane filtration devices 1 that want to use the blower 5 are Step of temporarily turning on and off the exclusive signal after the exclusive signal is turned off to start counting the first waiting time T1 of the own device and starting the counting of the first waiting time T1 of the other device 1 And each device 1 that wants to use the blower 5 includes the step of occupying the blower 5 by turning on the exclusive signal when the exclusive signal is not turned ON within its first waiting time T1.

  The operation of the first embodiment configured as described above will be described. First, the operation of the membrane filtration system will be schematically described, and then the cooperative control method of the first embodiment will be described.

(Membrane filtration system operation)
First, in each of the membrane filtration devices 1, the first on-off valve 14 and the second on-off valve 15 are opened, and the third on-off valve 17, the fourth on-off valve 19, and the fifth on-off valve 21 are opened. The sixth on-off valve 23 is closed. And the raw water on-off valve (not shown) provided upstream or downstream of the feed water pump 2 is opened to operate the feed water pump 2. Then, the water to be treated is supplied to each hollow fiber separation membrane section 7 of each membrane filtration device 1 through the water to be treated supply line 3.

  In each of the hollow fiber separation membrane portions 7, water to be treated is supplied from the outside to the inside of the hollow fiber membranes constituting each hollow fiber membrane module 10. When the water to be treated is contaminated with harmful microorganisms, the harmful microorganisms are blocked on the outer surface of the hollow fiber membrane. Further, when the water to be treated contains a suspended substance (for example, algae having a positive surface charge), the suspended substance is blocked on the outer surface of the hollow fiber membrane. That is, each of the hollow fiber separation membrane parts 7 acts to physically remove harmful microorganisms and suspended substances from the water to be treated. As a result, the treated water becomes clean treated water (permeated water) from which various impurities are removed and flows out to the inside of the hollow fiber membrane. And the permeated water which passed each said hollow fiber separation membrane part 7 merges in each said treated water line 4, and is used as drinking water or facility water after being sent in the said treated water tank.

  By the way, if water is passed through the hollow fiber separation membrane portions 7 for a long time, the harmful harmful microorganisms and suspended substances accumulate, and a desired treatment flow rate cannot be obtained gradually. For this reason, in the membrane filtration system of Example 1, each hollow fiber membrane module 10 is periodically cleaned for each membrane filtration device 1. This operation is performed so that the module is detected to be clogged and the module is clogged more than a predetermined value, or is operated when a predetermined time has elapsed.

  In the cleaning operation (regeneration process), an extrusion cleaning process, a bubbling cleaning process, and a drainage process are sequentially performed. First, in the extrusion cleaning step, in each membrane filtration device 1 to be cleaned, the third on-off valve 17 is opened, the first on-off valve 14, the second on-off valve 15, the first The fourth on-off valve 19, the fifth on-off valve 21, the sixth on-off valve 23, and the seventh on-off valve 33 are closed. Then, air is supplied from the compressor 8 at a predetermined pressure. The supplied air pressurizes the permeated water remaining in the treated water line 4 and the cap members 12 via the second gas supply line 16. Then, the permeated water remaining inside each of the hollow fiber membranes is pushed out toward the outside, and the deposit is pushed away from the outer surface of the hollow fiber membrane. When the above extrusion cleaning is performed for a predetermined time (for example, 5 seconds to 1 minute), the bubbling cleaning step is subsequently performed.

  In the bubbling washing step, the fourth on-off valve 19 and the seventh on-off valve 33 are opened, and the first on-off valve 14, the second on-off valve 15, the third on-off valve 17, and the fifth on-off valve. The on-off valve 21 and the sixth on-off valve 23 are closed. Then, the blower 5 is driven to supply air at a predetermined pressure. The supplied air is sent to the air diffuser 13 at the bottom of each vessel 11 via the first gas supply line 6. By generating a large number of bubbles through the air diffuser 13, the hollow fiber membranes are swung, and the deposits swept away in the extrusion process are separated and dispersed. Air escapes to the atmosphere via the overflow line 32. When the above bubbling cleaning process is performed for a predetermined time (for example, 5 to 30 minutes), the draining process is subsequently performed.

  In the draining step, the fifth on-off valve 21 is opened, and the first on-off valve 14, the second on-off valve 15, the third on-off valve 17, the fourth on-off valve 19, and the sixth on-off valve. The valve 23 is closed. Thereby, the to-be-processed water remaining in each vessel 11 is discharged out of the system through the drainage line 20 together with the deposits removed by washing. The above draining process is performed for a predetermined time (for example, 5 to 10 minutes).

(Cooperation control operation)
Next, the cooperative control of the first embodiment will be described with reference to FIGS. When performing the cooperative control, each of the membrane filtration devices 1 always calculates the first waiting time T1 based on the formula 1. Assuming that the priority margins of Units 1 to 3 are 0, 1, and 0, respectively, the first waiting time T11 of Unit 1 is 1 + 0 × 3 + 1 = 2, and the first waiting time T12 of Unit 2 is 1 + 1 × The first waiting time T13 of 3 + 2 = 6, 3 is calculated as 1 + 0 × 3 + 3 = 4.

  Next, the operation for exclusive processing determination will be described. Now, as shown in FIG. 5, it is assumed that the exclusive signal is OFF and the exclusive request for the blower 5 is generated sequentially at times t1, t2, and t3 in the No. 3, No. 2, and No. 1 units. The exclusive request is an internal state indicating that the water passage time set for each membrane filtration device 1 has elapsed, the clogging state is determined to be greater than or equal to the set value, and the bubbling cleaning process needs to be started. . First, the No. 3 machine closes the switch 26 in process step S1 (hereinafter, process step SN is simply referred to as SN), temporarily turns on the exclusive signal (one-shot ON), and proceeds to S2. Transition to start timing the first waiting time.

  While the exclusive signal is ON, YES is determined in S3. The determination of S3 is performed by a detection signal from the detection unit 30. If YES is determined in S3, the process proceeds to S4 to set the time of the first waiting time T13 to an initial value (zero). In S4, for the device 1 for which the exclusive request has been generated, the process of redoing the timing of the first waiting time is performed from the beginning. Thus, when the exclusive signal is ON, the time of the first waiting time becomes zero in the processing of S3 → S4 → S2.

  Next, when a request for exclusive use is issued from Unit 2, as in Unit 3, after counting the first waiting time T12 of its own at S1, the timing of the first waiting time T12 is set to the initial value by the processing of S3 and S4. To. In addition, since the exclusive signal ON is input to the No. 3 machine in which the exclusive request is generated by the one-shot exclusive signal output from the No. 2 machine, the time measurement is reset by the processing of S3 and S4.

  Further, when an exclusive request is generated in the first machine, the timing of its own first waiting time T11 is started in S2 as in the third machine. As shown in FIG. 5, this time measurement expresses that the shorter the first waiting time, the steeper the slope and the shorter the time to reach the time measurement end value. When the one-shot exclusive signal from the first unit is switched from ON to OFF, the third and second units for which the exclusive request continues to be generated start timing of the first waiting times T13 and T12 as shown in FIG.

  In this way, the timing of the first waiting times T11, T12, and T13 is started in a state where the exclusive requests are generated in the first, second, and third units, but since T11 <T13 <T12, the first unit is started. Will end timing (t5) first. In the example of FIG. 5, when the exclusive signal is turned OFF by turning on / off of the one-shot output of the first car (t4), NO is determined in S3 in the first to third machines, and the process proceeds to S5. In S5, Unit 1 with the shortest first waiting time first determines YES, so Unit 1 shifts to S6 and turns on the exclusive signal, shifts to S7 and occupies the blower 5 exclusively for the bubbling. Start the cleaning process. When the bubbling cleaning process ends, the exclusive signal is turned OFF in S8. Here, since the exclusive signal of No. 2 and No. 3 is ON after t5, the state of the initial value is continued in the timing by the loop of S3-S4-S3.

  Thus, according to the cooperative control of the first embodiment, each membrane filtration device 1 that wants to occupy the blower 5 simply delays the use of the blower 5 by the first waiting time T1 when the exclusive signal is confirmed to be ON. With this configuration, cooperative control that does not use the blower 5 at the same time is possible. Therefore, even if a device having the membrane filtration devices 1, 1,... Fails, the remaining devices can perform cooperative control. In addition, since a conventional management apparatus is not used, the management apparatus does not break down and cannot be linked together.

  In addition, since the use priority order of the blower 5 is set by changing the value of the first waiting time T1, the priority order can be easily set. In addition, the first waiting time is set based on the priority margin of each device and different constants set in each membrane filtration device 1, thereby easily setting the priority of use of the blower 5. Can do. And since the priority margin is set according to the clogging state, it is possible to perform the cleaning from the membrane filtration device 1 having a lot of clogging.

  Next, a second embodiment of the cooperative control method of the present invention will be described with reference to FIGS. FIG. 6 is a flowchart for explaining the processing procedure of the cooperation control method of the second embodiment, and FIG. 7 is a time chart for explaining the operation of the second embodiment. The cooperative control method of the second embodiment is also implemented in the membrane filtration system of FIGS. 1 and 2 as in the first embodiment, and performs the cooperative control using the exclusive signal sharing device 24 shown in FIG. Hereinafter, a description will be given focusing on differences from the first embodiment.

The cooperative control procedure of the second embodiment is as shown in FIG. 6, but each membrane filtration device 1 that wants to use the blower 5 is turned off after the exclusive signal is temporarily turned on by another membrane filtration device 1. Then, immediately after the OFF, the timing of the first waiting time T1 is restarted, and after the first waiting time T1 elapses, the exclusive signal is turned on under the condition that the exclusive signal is OFF, This is common with the cooperation control of the first embodiment.

  The difference from the first embodiment is that each membrane filtration device 1 that wants to use the blower 5 temporarily turns on and turns off the exclusive signal after the exclusive signal is turned off, and starts measuring its own first waiting time T1. In addition, the other device 1 also starts counting its own first waiting time T1, and each membrane filtration device 1 that wants to use the blower 5 turns on the exclusive signal after the first waiting time T1 has elapsed. The step of setting different collision detection waiting time (second waiting time) T2 between the membrane filtration devices 1 and waiting for the second waiting time T2, and the membrane filtration devices 1 that want to use the blower 5 are When the exclusive signal is turned off after the second waiting time T2 elapses and it is detected that the exclusive signal remains ON, the occupation of the blower 5 is postponed until it is determined that there is a collision and the exclusive signal is turned off. When detecting OFF, it is that it includes a step of performing exclusive of the blower 5 to ON exclusive signal.

In the second embodiment, the first waiting time T1 and the second waiting time T2 are calculated by Equations 2 and 3, respectively.
T1 = (1 + priority margin) ... Equation 2
T2 = (1 + ID) ... Equation 3
Here, the priority margin and the ID are basically the same as those in the first embodiment. In the second embodiment, the priority margin is not necessarily a discrete value (integer).

  Next, the cooperative control of the second embodiment will be described with reference to FIGS. When performing cooperative control, each of the membrane filtration devices 1 always calculates the first waiting time T1 based on the equation 2 and the second waiting time T2 based on the equation 3. FIG. 7 shows a case where the No. 1 and No. 3 machines having the same priority margin are in a condition for using the blower 5 almost simultaneously. When the priority margin of Unit 1 and Unit 3 is 1, the first waiting time T11 of Unit 1 is 1 + 1 = 2, the second waiting time T22 is 1 + 1 = 2, and the first waiting time T13 of Unit 3 is 1 + 1 = 2 and the second waiting time T23 is calculated as 1 + 3 = 4.

  Now, a case will be described in which the exclusive signal is in the OFF state and the first and third machines having the same priority margin satisfy the condition for using the blower 5 almost simultaneously. Unit 1 issues an exclusive request for the blower 5 at time t6. In the processing step S11, the first machine closes the switch 26, temporarily turns the exclusive signal ON and OFF, starts time measurement in S12, and proceeds to S13. In this case, since the exclusive signal is OFF, NO is determined and the process proceeds to S15. In S15, NO is determined, and the process returns to S13 to continue counting the first waiting time T11.

  Next, when the third machine issues a request for exclusive use at time t7, the exclusive signal is temporarily turned on and turned off in S11 as in the first machine, and the timing of the first waiting time T13 is started in S12. When the exclusive signal is turned ON, the first machine restarts the time measurement of the first waiting time T11 from S13 → S14 → S15.

  In this example, since the value of the first waiting time T1 of No. 1 machine and 3 is the same, both end timing at time t8. Then, YES is determined in S15, and the No. 1 and No. 3 machines both turn on the exclusive signal in S16, and start counting the second waiting times T21 and T23, respectively, in S17.

In this case, since T21 <T23, Unit 1 finishes counting the second waiting time T21 first (time t9), turns off the exclusive signal in S18, and checks whether the exclusive signal is turned off in S19. judge. Here, since Unit 3 outputs the exclusive signal ON, Unit 1 detects the collision, that is, detects the exclusive signal ON of Unit 3, and therefore maintains the exclusive signal OFF. In the third machine, when the timing of the second waiting time T23 is finished at time t10, the exclusive signal is turned off in S18, and it is determined in S19 whether the exclusive signal is OFF. In this case, since Unit 1 has the exclusive signal OFF, in Unit 3, YES is determined in S19, the process proceeds to S20, the exclusive signal is turned on, the process proceeds to S21, and the blower 5 is exclusively used. Unit 3 starts the bubbling cleaning process. When the bubbling cleaning process is completed, the exclusive signal is turned OFF in S22.

  Thus, according to the cooperative control of the second embodiment, each membrane filtration device 1 that wants to occupy the blower 5 postpones the use of the blower 5 by the first waiting time T1 when the exclusive signal is confirmed to be ON. The simple control of detecting a collision by the second waiting time T2 enables cooperative control that does not use the blower 5 at the same time. Further, even if a device with the membrane filtration devices 1, 1,... Fails, the remaining devices can perform cooperative control.

  Moreover, since the said apparatus 1 with long said 2nd waiting time T2 can use the said fan 5 preferentially, the use priority of the said fan 5 is made different by changing the value of said 2nd waiting time T2. Compared with the cooperative control method of the first embodiment that can be set, the processing is complicated, but the priority margin need not be discretely divided and can be a continuous value. In most cases, the first waiting time T1 can be shortened.

  The present invention is not limited to the first and second embodiments, and can be applied to systems and apparatuses other than the membrane filtration system, for example. In the first and second embodiments, each membrane filtration device 1 that wants to occupy the blower 5 is configured to start bubbling washing when the blower 5 can be exclusively used. The membrane filtration device 1 that can be used exclusively can be used until the drainage process of the membrane filtration device 1 that has previously used the blower 5 is completed, that is, the membrane, even if the blower 5 becomes available. It can be configured to wait until the regeneration step is finished and enter the membrane regeneration step starting from the extrusion cleaning step. According to this configuration, since the plurality of membrane filtration devices 1 do not enter the membrane regeneration step at the same time, it is possible to prevent a reduction in the treated water supply capacity of the system.

The schematic block diagram of the membrane filtration system which implemented the cooperation control method of Example 1 of this invention. The schematic block diagram explaining the detail of the principal part of the filtration system. FIG. 2 is a schematic configuration diagram of an exclusive signal sharing apparatus according to the first embodiment. The flowchart figure explaining the process sequence of the cooperation control method of the Example 1. FIG. FIG. 3 is a time chart illustrating the operation of the first embodiment. The flowchart figure explaining the process sequence of the cooperation control method of Example 2 of this invention. The time chart figure explaining operation | movement of the Example 2. FIG.

Explanation of symbols

1 Membrane filtration device (device)
5 Blowers (shared equipment)
24 Exclusive signal sharing device (exclusive signal sharing means)
25 Exclusive signal line 26 Switch 30 Detection device (detection means)

Claims (3)

A cooperative control method for controlling not to use shared devices shared by multiple devices at the same time,
Each device shares one exclusive signal, and when at least one device turns on the exclusive signal, the other device includes an exclusive signal sharing means for inputting the exclusive signal ON,
Each device that wants to use the shared device starts timing the first waiting time when the exclusive signal is turned from ON to OFF by another device, and the exclusive signal is turned OFF after the first waiting time has elapsed. Turn on the exclusive signal to occupy the shared device ,
The first waiting time is set to a different value in each device,
Each device that wants to use the shared device temporarily turns off the exclusive signal, and starts counting its first waiting time after the exclusive signal is turned off. A step to start timing the waiting time;
Each of the devices that want to use the shared device includes the step of turning on the exclusive signal and occupying the shared device when the exclusive signal is not turned on within its first waiting time. The linkage control method. The cooperative control method according to claim 1, wherein the first waiting time is set based on a priority margin of each device and / or a different constant set in each device . The exclusive signal sharing means includes a pair of exclusive signal lines, a switch that is closed when the exclusive signal is turned on to short-circuit the exclusive signal line, and a switch that is opened and opened when turned off, and a short circuit between the exclusive signal line, The linkage control method according to claim 1, further comprising detection means for detecting opening .

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