JP2017036732A - Drainage device and method of controlling drainage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage device capable of decreasing the number of water level detectors, and a method of controlling the drainage device.SOLUTION: A drainage device 10 is equipped with a pump device 30 disposed in a water tank 20; a first water level detector 40 which detects a first water level L1 in the water tank 20; a second water level detector 50 which detects a second water level L2; a memory portion 80 which memorizes (N-1) of first threshold values T1, T2, and T3 used for deciding and determining the number of the driven pump devices 30, when assuming the number of pump devices 30 as N; and a control device 70 which measures a first time t1 during which the water level rises from the first water level L1 to the second water level L2 on the basis of detection results of the water level detectors 40 and 50, decides the number of driven pump devices 30 on the basis of comparison results between the first time t1 and the first threshold values T1, T2, and T3, drives the decided number of pump devices 30, and stops the pump device 30 when it is determined that the water level is lowered to the first water level L1 on the basis of the detection result of the first water level detector 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drainage device for draining water and a method for controlling the drainage device.

  A drainage device that stores sewage in, for example, a water tank and pumps the sewage to the secondary side when the sewage in the water tank reaches a predetermined water level is known (see, for example, Patent Document 1). This drainage device is a water tank that can store sewage, a plurality of pump devices that pump sewage in the water tank to the secondary side, a water level detector that is provided in each pump device, and controls the pump device according to the water level It has a control device.

JP 56-132486 A

  As described above, the drainage device in which each pump device has a water level detector has the following problems. That is, since the water level detector is provided in each pump device, the number of water level detectors increases as the number of pump devices increases. The increase in the number of water level detectors increases the manufacturing cost of the drainage device.

  Accordingly, an object of the present invention is to provide a drainage device that can reduce the number of water level detectors, and a method for controlling the drainage device.

  As one aspect of the present invention, a drainage device is disposed in a water tank, and a plurality of pump devices for draining the water in the water tank to the outside of the water tank, and a first water level for detecting a first water level in the water tank. A detector, a second water level detector for detecting a second water level higher than the first water level in the water tank, and a first threshold value used for determining the number of drive units of the pump device, When the number of pump devices is N, the water level in the water tank is determined based on the storage unit storing (N-1) number, and the detection results of the first water level detector and the second water level detector. A first time until the water level rises from the first water level to the second water level is measured, and the number of pump devices driven is determined based on a comparison result between the first time and the first threshold value. Driving the determined number of pump devices and detecting the first water level detector. When the water level in the water tank is determined to have decreased to the first level based on, and a control means for stopping the pump device.

  As one aspect of the present invention, a drainage device control method detects a first water level detector that detects a first water level in a water tank and a second water level that is higher than the first water level in the water tank. Using a second water level detector, a first time until the first water level rises to the second water level is measured, and used for determining the first time and the number of pump devices to be driven. The first threshold value is compared, and the number of driven pump devices that drain the water in the water tank to the outside of the water tank is determined based on the comparison result.

  The present invention can provide a drainage device capable of reducing the number of water level detectors and a method for controlling the drainage device.

Schematic which shows the drainage apparatus which concerns on the 1st Embodiment of this invention. The side view showing the state where the 1st water level detector and the 2nd water level detector were connected to the 1st output terminal of the control device of the drainage device. The flowchart which shows an example of operation | movement of the drainage. The flowchart which shows an example of operation | movement of the drainage. The flowchart which shows an example of operation | movement of the drainage. The flowchart which shows an example of operation | movement of the drainage. Schematic which shows the drainage apparatus which concerns on the modification of this embodiment. Schematic which shows the drainage apparatus which concerns on the 2nd Embodiment of this invention. The flowchart which shows an example of operation | movement of the drainage. The flowchart which shows an example of operation | movement of the drainage. The flowchart which shows an example of operation | movement of the drainage. The flowchart which shows an example of operation | movement of the drainage. Schematic which shows the drainage apparatus which concerns on the modification of this embodiment.

A drainage device 10 according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view showing a drainage device 10. FIG. 2 is a side view showing a state in which the terminal 44 of the first water level detector 40 and the terminal 44 of the second water level detector 50 are connected to the first input terminal portion 71 of the control device 70. is there. FIGS. 3-6 is a flowchart which shows an example of operation | movement of the drainage device 10. The drainage device 10 is formed so that sewage can be pumped to the secondary side when sewage is stored in the water tank 20 to a predetermined water level. .

  As shown in FIG. 1, the drainage device 10 includes a water tank 20 capable of storing sewage, a plurality of pump devices 30 arranged in the water tank 20, and a first water level capable of detecting a first water level L <b> 1 in the water tank 20. A detector 40, a second water level detector 50 capable of detecting a second water level L2 in the water tank 20, a third water level detector 60 capable of detecting a third water level L3 in the water tank 20, and a plurality of A control device (control means) 70 capable of controlling the pump device 30 is provided.

  The water tank 20 is formed so that sewage can flow in. The water tank 20 is provided with, for example, an inflow pipe, and sewage flows from the primary side through the inflow pipe. The 1st water level L1 is a stop water level which stops the pump apparatus 30 in drive. The second water level L2 is a higher water level than the first water level L1, and is an activation water level that activates the pump device 30. The 3rd water level L3 is a water level higher than the 2nd water level L2, and is a water level with the danger that the sewage stored in the water tank 20 will overflow.

  The pump device 30 is a so-called sewage pump device, and is configured so that sewage in the water tank 20 can be pumped to the secondary side of the water tank 20 through a discharge pipe. A plurality of pump devices 30 are provided, for example, four.

  The pump device 30 includes a pump and a motor that drives the pump. Each pump apparatus 30 is arrange | positioned in the water tank 20, for example in the bottom vicinity. The suction port of each pump is disposed at a position lower than the first water level L1.

  The first water level detector 40 is a float switch. The first water level detector 40 includes a float 41 floating on the water surface, a switch 42 that is turned on / off according to the position of the float 41, a pair of lead wires 43 connected to the switch 42, and an end of the lead wire 43. And a terminal 44 connected to each of the terminals.

  The float 41 is supported by, for example, a support portion provided in the water tank 20, and is supported so as to be tiltable within a predetermined angle range around one end portion by changing the water level.

  For example, the switch 42 is turned on when the float 41 is tilted by a predetermined angle, and is turned off at other positions.

  As shown in FIG. 2, the terminal 44 has a fixing portion 44a fixed to the end portion of the lead wire 43, and a terminal portion 44b provided on an edge of the fixing portion 44a.

  The fixing portion 44a is formed so as to be fixed to the lead wire 43 by, for example, being crimped. For example, the fixing portion 44a is formed in a cylindrical shape in which the lead wire 43 can be arranged.

  The terminal portion 44b is formed in a planar shape in which one main surface 44d is, for example, flush with the peripheral surface of the fixed portion 44a. The terminal portion 44b is formed in a shape having an opening through which the screw 90 can be inserted. The terminal portion 44b has, for example, an annular flat plate shape into which the screw 90 can be inserted.

  In the first water level detector 40, when the water level becomes equal to or higher than the first water level L1, the float 41 is tilted by receiving buoyancy from sewage, and the switch 42 transmits an ON signal.

  The second water level detector 50 uses the same float switch as the first water level detector 40. For this reason, each part of the 2nd water level detector 50 attaches | subjects the same code | symbol as the 1st water level detector 40, and abbreviate | omits description. In the second water level detector 50, when the water level becomes equal to or higher than the second water level L2, the float 41 is tilted by receiving buoyancy from sewage, and the switch 42 transmits an ON signal.

  The third water level detector 60 uses the same float switch as the first water level detector 40. For this reason, each part of the 3rd water level detector 60 attaches | subjects the same code | symbol as the 1st water level detector 40, and abbreviate | omits description. In the third water level detector 60, when the water level becomes equal to or higher than the third water level L3, the float 41 tilts and the switch 42 transmits an ON signal.

The control device 70 includes an electromagnetic contactor 76, an ammeter 77, a circuit unit 78 to which each water level detector 40, 50, 60 is connected, a timer 79, a storage unit 80 for storing information such as a plurality of threshold values, and a control. Part 81,
The magnetic contactor 76 is configured to be able to supply electric power to the motor of each pump device 30. The ammeter 77 is formed so as to be able to detect a current value supplied to each pump device 30.

  The circuit part 78 is formed so that the lead wires 43 of the water level detectors 40, 50, 60 can be connected via the terminals 44. Specifically, the circuit unit 78 includes a first input terminal unit 71, a second input terminal unit 72, a third input terminal unit 73, a fourth input terminal unit 74, and a fifth input terminal unit. 75. The input terminal portions 71, 72, 73, 74, and 75 are, for example, arranged in order from the left side in the drawing. Each input terminal portion 71, 72, 73, 74, 75 is formed with a screw hole into which the screw 90 can be screwed.

  A screw 90 inserted through the terminal portion 44b of one lead wire 43 of the first water level detector 40 is screwed into the second input terminal portion 72, whereby the terminal portion 44b is fixed. The terminal portion 44b is fixed to the third input terminal portion 73 by screwing a screw 90 inserted into the terminal portion 44b of one lead wire 43 of the second water level detector 50 into the third input terminal portion 73. The terminal portion 44 b is fixed to the fifth input terminal portion 75 by screwing a screw 90 inserted into the terminal portion 44 b of one lead wire 43 of the third water level detector 60.

  The first input terminal portion 71 is screwed into a screw 90 inserted through the terminal portion 44b of the other lead wire 43 of the first water level detector 40 and the second water level detector 50, so that the terminal The part 44b is fixed. The terminal portions 44b of the water level detectors 40 and 50 are fixed so that the main surfaces 44d face each other.

  The terminal portion 44b is fixed to the fourth input terminal portion 74 by screwing a screw 90 inserted through the terminal portion 44b of the other lead wire 43 of the third water level detector 60 into the fourth input terminal portion 74.

  The timer 79 is configured to be able to measure a first time t1 until the water level in the water tank 20 rises from the first water level L1 to the second water level L2. The timer 79 is formed so as to be able to measure the second time t2 until the water level in the water tank 20 drops from the second water level L2 to the first water level L1.

  The storage unit 80 stores a first threshold value used for determination to determine the number of pump devices 30 to be driven, a correction coefficient K for correcting the first threshold value, and a second threshold value X used for determination of idling of the pump. Yes. The storage unit 80 is configured to be able to store the number m of determinations for determining the number of units.

  The first threshold is a threshold that is compared with the first time t1. When the number of pumps is N, (N−1) number of first threshold values are stored in the storage unit 80. In the present embodiment, since four pump devices 30 are used, the first number determining threshold value T1, the second number determining threshold value T2, and the third number determining threshold value T3 are used as the first threshold values. Is stored in the storage unit 80.

  The first number determining threshold value T1 is, for example, four pump devices 30 in a state where the sewage in the water tank 20 is filled up to the second water level L2 and the sewage of a predetermined flow rate is flowing into the water tank 20. Is the time until the water level in the water tank 20 drops from the second water level L2 to the first water level L1. The pump device 30 performs an operation in which the rotation speed of the motor becomes a predetermined rotation speed determined in advance.

  The predetermined flow rate described above is, for example, an average value of the flow rate of sewage flowing into the water tank 20 in an environment where the drainage device 10 is used. This average value is a value obtained in advance by experiments or the like.

  The second threshold value T2 for determining the number of units is, for example, three pumps in a state where the sewage in the water tank 20 is filled up to the second water level L2 and the above-mentioned predetermined flow rate of sewage flows into the water tank 20. It is time until the water level in the water tank 20 drops from the second water level L2 to the first water level L1 by driving each of the devices 30. The pump device 30 performs an operation in which the rotation speed of the motor becomes the predetermined rotation speed described above.

  The third number determination threshold T3 is, for example, two pumps in a state where the sewage in the water tank 20 is filled up to the second water level L2 and the above-described predetermined flow rate of sewage flows into the water tank 20. It is time until the water level in the water tank 20 drops from the second water level L2 to the first water level L1 by driving each of the devices 30. The pump device 30 performs an operation in which the rotation speed of the motor becomes the predetermined rotation speed described above.

  The correction coefficient K is a constant that is multiplied by the number determination thresholds T1, T2, and T3. The correction coefficient K is set to a value larger than 1. In the present embodiment, the correction coefficient K is set to any value of 1.1 ≦ K ≦ 1.9, for example.

  The second threshold value X is a current value supplied to the pump device when the pump is idling and is smaller than a current value supplied to the pump device 30 during pumping. Here, the idling of the pump is a state where the pump is driven in a state where the pump is not filled with sewage. Since the operating load of the idling pump is reduced, the current supplied to the pump device 30 is smaller than that during pumping.

  The determination number m of the number determination is the number of comparisons between the first time t1 and the first number determination threshold T1, the second number determination threshold T2, and the third number determination threshold T3.

  The controller 81 is configured to be able to detect the outputs of the water level detectors 40, 50, 60. The control unit 81 is configured to be able to control the timer 79, and is configured to be able to store the first time t <b> 1 and the second time t <b> 2 measured by the timer 79 in the storage unit 80. In addition, the control unit 81 is configured to be able to store the number of determinations m. For example, the control unit 81 controls the electromagnetic contactor 76 so that the pump device 30 can be controlled so that the pump device 30 performs the above-described predetermined number of rotations of the motor. Has been.

  The control unit 81 has the following functions 1 to 4.

  Function 1 is a function for determining the number of pump devices 30 to be driven in accordance with the rising speed of the water level in the water tank 20. Therefore, the time until the water level rises from the first water level L1 to the second water level L2 is compared with the first time t1, and the number of pump devices 30 to be driven is determined based on the comparison result.

  Specifically, first, the first time t1 is compared with the first number determination threshold value T1, and if it is determined that the first time t1 is less than the first number determination threshold value T1, the pump device 30 The number of drives is determined to be four. If it is determined that the first time t1 is equal to or greater than the first number determination threshold T1, then the first time t1 is compared with the second number determination threshold T2, and the first time t1 is equal to the first number t1. If it is determined that the number is less than the number of units determination threshold T2, the number of pump devices 30 to be driven is determined to be three.

  If it is determined that the first time t1 is equal to or greater than the second number determination threshold T2, then the first time t1 is compared with the third number determination threshold T3, and the first time t1 is If it is determined that the number is less than 3, the number of pump devices 30 is determined to be two. If it is determined that the first time t1 is equal to or greater than the third number determination threshold, the number of pump devices 30 to be driven is determined to be one.

  When the function 2 determines that the drainage capacity of sewage due to the driving of the number of pump devices 30 determined by the function 1 is excessive, the first number is set so that the number of drainage capacity can be determined appropriately. This function corrects the threshold value.

  Specifically, when the pump device 30 is driven, the second time t2 until the water level in the water tank 20 decreases from the second water level L2 to the first water level L1, the water level in the water tank 20 is the first. In order to reduce the number of pump devices 30 to be driven by determining that the drainage capacity of the pump device 30 is excessive when it is equal to or less than the first time t1 until the water level L1 rises to the second water level L2. Each of the number determination thresholds T1, T2, T3 is multiplied by a correction coefficient K to correct each of the number determination thresholds T1, T2, T3.

  Function 3 is a function of determining that the pump device 30 is idling when the detection value of the ammeter 77 is equal to or less than the second threshold value X, and stopping the pump device 30 that is judged to be idling.

  Function 4 is that when the second water level detector 50 is turned on while the first water level detector 40 is off, the first time t1 cannot be measured, and the first water level detector 40 has a problem. This is a function for driving all the pump devices 30.

  Next, operation | movement of the drainage apparatus 10 is demonstrated using FIGS.

  First, the control unit 81 resets the first time t1, the second time t2, and the determination number m stored in the storage unit 80, and sets each to “0” (step ST1).

  Next, the control unit 81 determines whether or not the first water level detector 40 is on. When the first water level detector 40 is not on (No in step ST2), the control unit 81 determines whether or not the second water level detector 50 is on. When it is determined that the second water level detector 50 is not on (No in step ST3), the control unit 81 continues monitoring until one of the water level detectors 40 and 50 is turned on.

  When determining that the first water level detector 40 is on (Yes in step ST2), the control unit 81 drives the timer 79 and starts measuring the first time t1 (step ST4).

  Next, the control unit 81 determines whether or not the second water level detector 50 is turned on. When determining that the second water level detector 50 is not on (NO in step ST5), the control unit 81 next determines whether or not the third water level detector 60 is on.

  If the control part 81 judges that the 3rd water level detector 60 is not ON (No of step ST6, returns to step ST5), it will continue monitoring until one of the water level detectors 50 and 60 turns on.

  When the control unit 81 determines that the second water level detector 50 is on (Yes in step ST5), the control unit 81 stops the timer 79 and stores the first time t1 in the storage unit 80 (step ST7).

  Next, the control unit 81 compares the first time t1 with the number determination thresholds T1, T2, and T3. First, in order to compare the first time t1 and the first number determination threshold value T1, 1 is added to m, m = 1 (step ST8), and the determination number m is stored in the storage unit 80. Next, the controller 81 compares the first time t1 with the first number determination threshold value T1 (step ST9). If it is determined that the first time t1 is less than the first number determination threshold value T1 (Yes in step ST9), it is determined that four pump devices 30 are necessary, and the number of pump devices 30 to be driven is all set. The four units are determined, and the electromagnetic contactor 76 is controlled to drive the four pump devices 30 (step ST10).

  Or if the control part 81 judges that 1st time t1 is more than the 1st number determination threshold value T1 (No of step ST9), the frequency | count m of judgment will be less than 4 used as the total number of pump apparatuses 30. It is determined whether or not there is (step ST11).

  Alternatively, when the control unit 81 determines that the determination number m is smaller than 4 that is the total number of pump devices 30 (Yes in step ST11), the control unit 81 adds 1 to the determination number m and stores it as two times. 80 (step ST12).

  Alternatively, when determining that the determination number m is 4 or more of the pump device 30 (No in step ST11), the control unit 81 determines that the determination of the number of pump devices 30 to be driven cannot be made any more, and the previous time The number determined to be excessive as the number of drives by the determination is determined as the number of drives. Specifically, the number of pump devices 30 to be driven is determined to be four (step ST10).

  Next, the control unit 81 compares the first time t1 with the second number determination threshold value T2. When the control unit 81 determines that the first time t1 is less than the second number determination threshold value T2 (Yes in step ST13), the control unit 81 determines that three pump devices 30 are necessary, and the electromagnetic contactor. 76 is controlled to drive the three pump devices 30 (step ST14).

  Or if the control part 81 judges that 1st time t1 is more than 2nd number determination threshold value T2 (No of step ST13), the frequency | count m of judgment will be less than 4 used as the total number of pump apparatuses 30. (Step ST15).

  In step ST15, since the number of determinations m is two, the control unit 81 determines that the number of determinations m is less than 4, which is the total number of pump devices 30 (Yes in step ST15), and the number of determinations m 1 is added, and the number of determinations m is set to 3 and stored in the storage unit 80 (step ST16).

Alternatively, if it is determined that the number of determinations m is equal to or greater than the total number of pump devices 30 (No in step ST15), the number of pump devices 30 to be driven is determined to be three, and the electromagnetic contactor 76 is controlled to be three The pump device 30 is driven (step ST14).
Next, the control unit 81 compares the first time t1 with the third number determination threshold value T3 (step ST17). When the control unit 81 determines that the first time t1 is less than the third number determination threshold value T3 (Yes in step ST17), the control unit 81 determines that two pump devices 30 are necessary, and the electromagnetic contactor. 76 is controlled to drive the two pump devices 30 (step ST18).

  Or if the control part 81 judges that 1st time t1 is more than 3rd number determination threshold value T3 (No of step ST17), the frequency | count m of judgment will be less than 4 used as the total number of pump apparatuses 30. It is determined whether or not there is (step ST19).

  Since the number of determinations m is 3, the control unit 81 determines that the number of determinations m is less than 4 which is the total number of pump devices 30 (Yes in step ST19), controls the electromagnetic contactor 76, One pump device 30 is driven (step ST20).

  Alternatively, if it is determined that the number m of determinations is not less than 4 which is the total number of pump devices 30 (No in step ST19), the two pump devices 30 are driven (step ST18).

  As described above, when the number of pump devices 30 to be driven is determined in steps ST10, ST14, ST18, and ST20, the control unit 81 determines each of the pump devices 30 being driven based on the detection result of the ammeter 77. The current value supplied to is monitored (step ST21).

  Next, the control unit 81 determines whether or not the third water level detector 60 is off (step ST22). When determining that the third water level detector 60 is not OFF (No in step ST22), the controller 81 drives four pump devices 30 (step ST10).

  Or if the control part 81 judges that the 3rd water level detector 60 is off (Yes of step ST22), it will judge whether the 2nd water level detector 50 is off (step ST23).

  When determining that the second water level detector 50 is off (Yes in step ST23), the control unit 81 controls the timer 79 and starts measuring the second time (step ST24).

  Next, the control unit 81 determines whether or not the first water level detector 40 is off (step ST25). When determining that the first water level detector 40 is off (Yes in step ST25), the control unit 81 stops the pump device 30 (step ST26).

  In addition, the control unit 81 stops the timer 79 and stops the measurement of the second time t2. Then, the information of the measured second time t2 is stored in the storage unit 80 (step ST27).

  Next, the control unit 81 determines whether or not the times t1 and t2 stored in the storage unit 80 are “0” (step ST28). When the control unit 81 determines that the times t1 and t2 are not “0” (Yes in step ST28), the control unit 81 then compares the times t1 and t2. If it is determined in step ST28 that at least one is “0” (No in step ST28), control unit 81 returns to step ST1A.

  When the control unit 81 determines that the first time t1 is equal to or greater than the second time t2 (Yes in step ST29), the control unit 81 determines that the number of driven pump devices 30 is greater than the required number, and the number determination threshold value. By multiplying each of T1, T2, and T3 by the correction coefficient K, the number determination threshold values T1, T2, and T3 are corrected (step ST30), and the corrected number determination threshold values T1, T2, and T3 are stored in the storage unit 80. Remember. And the control part 81 returns to the process of step ST1.

  Or if the control part 81 judges that 1st time t1 is not more than 2nd time t2 (No of step ST29), it will judge that the drive number of the pump apparatus 30 was suitable, and threshold value T1 for number determination. , T2, and T3 are not corrected, and the process returns to step ST1.

  Further, when determining in step ST3 that the second water level detector 50 is not OFF, the control unit 81 determines that there is a problem with the first water level detector 40 (Yes in step ST3), and the second Without measuring 1 time t1, 1 is added to the number of determinations m to make one (step ST8), and the number of determinations m is stored in the storage unit 80 (step ST8). Thereafter, steps after step ST8 are performed.

  As a malfunction of the first water level detector 40, for example, a foreign substance in the water tank 20 is entangled with the float 41 of the first water level detector 40, and the float 41 becomes unable to tilt and cannot transmit an ON signal. . Alternatively, there is a problem that the switch 42 of the first water level detector 40 fails and the ON signal cannot be transmitted.

  If the water level in the water tank 20 is equal to or higher than the second water level L2 in a state where the first water level detector 40 cannot transmit the ON signal, the first water level detector 40 remains off and the second water level The detector 50 is turned on.

  Since the first water level detector 40 cannot transmit the ON signal, the control unit 81 does not measure the first time t1. The first time t1 is set to “0” in step ST1. A value other than “0” is stored for the second time t2. For this reason, the control unit 81 determines that the first time t1 is “0” in step ST28, and does not perform steps ST29 and ST30 (No in step ST28).

  Further, in step ST25, the control unit 81 determines that the first water level detector 40 is on (No in step ST25), and the pump device 30 idles based on the detection result of the ammeter 77. If it is determined (Yes in step ST31), it is determined that a failure has occurred in the first water level detector 40, and the pump device 30 is stopped (step ST32). For example, the control unit 81 stops in order from the pump device 30 determined to be idling. Further, the control unit 81 continues monitoring until all the pump devices 30 that have been driven stop. When all the pump devices 30 that have been driven are stopped, the process proceeds to step ST27.

  The malfunction of the first water level detector 40 is, for example, that foreign matter in the water tank 20 is entangled with the float 41 of the first water level detector 40, and the float 41 cannot return from the tilted position, and an on signal is transmitted. For example, there is a problem in which the state continues, or a problem in which the switch 42 of the first water level detector 40 fails and the on signal is continuously transmitted.

  If the control unit 81 determines in step ST6 that the third water level detector 60 is on (Yes in step ST6), the control unit 81 determines that there is a problem in the second water level detector 50, and the pump All devices 30 are driven (step ST33). Thereafter, the control unit 81 continues to monitor the third water level detector 60. When the third water level detector 60 is turned off (Yes in step ST34), whether or not the first water level detector 40 is turned off. Is determined (step ST25).

  In addition, when the control unit 81 determines that the second water level detector 50 is not OFF (No in step ST23) and determines that the first water level detector 40 is OFF (Yes in step ST35), the ammeter 77 Based on the detected result, the current value supplied to each of the pump devices 30 being driven is compared with the second threshold value X to determine whether or not the pump device 30 is idling (step ST36).

  If the control unit 81 determines that any one of the pump devices 30 is idling (Yes in step ST36), the control unit 81 controls the electromagnetic contactor 76 to stop the pump device 30 that is idling (step step). ST37).

  When it is determined that the pump device 30 is not idling (No in step ST36), the control unit 81 continuously monitors the current value supplied to the pump device 30. When all the pump devices 30 that have been driven stop, the control unit 81 proceeds to step ST27.

  Or the pump apparatus 30 will stop the pump apparatus 30 by which the idling judgment was carried out, if the idling of the pump apparatus 30 was judged (step ST37).

  In the drainage device 10 configured as described above, the control unit 81 determines the number of pump devices 30 to be driven based on a comparison result between the first time t1 and the number determination threshold values T1, T2, and T3. As the water level detector for detecting the water level, the first water level detector 40 and the second water level detector 50 are used.

  For this reason, since the number of water level detectors for the number of pump devices 30 is not used to determine the number of pump devices 30 to be driven, the number of water level detectors can be reduced.

  When the time t1 and the time t2 are compared and it is determined that the first time t1 is equal to or greater than the second time t2, the number of pump devices 30 to be driven is corrected by correcting the number determination threshold values T1, T2, and T3. Can be determined to be the number that achieves the required drainage capacity, so that the useless pump device 30 is not driven and the power consumption of the drainage device 10 can be reduced.

  Further, when the third water level detector 60 detects the third water level L3, all the pump devices 30 are driven. Therefore, even if a failure occurs in the second water level detector 50, the pump device 30 is Can be driven.

  In addition, since the pump device 30 is stopped when the pump device 30 is determined to idle, the pump device 30 can be stopped even if a failure occurs in the first water level detector 40.

  Further, by reducing the number of water level detectors, the number of input terminal portions 71, 72, 73, 74, 75 provided in the control device 70 can be reduced.

  In addition, this invention is not limited to the said embodiment. In the above embodiment, flow switch type water level detectors 40, 50 and 60 are used as the water level detectors. As another example, as shown in FIG. 7, an electrode-type water level detector 100 capable of detecting the water levels L1, L2, and L3 may be used.

  The water level detector 100 includes a common electrode 101, a first electrode 102, a second electrode 103, and a third electrode 104.

  The common electrode 101 is connected to the lead wire 43. A terminal 44 is fixed to the end of the common electrode 101. The common electrode 101 is fixed to the first input terminal portion 71 via the terminal 44. The common electrode 101 is formed in a rod shape whose tip is positioned below the first water level L1.

  The first electrode 102 is connected to the lead wire 43. A terminal 44 is fixed to the end of the lead wire 43 of the first electrode 102. The first electrode 102 is fixed to the second input terminal portion 72 via the terminal 44. The first electrode 102 is formed in a rod shape whose tip is located at the first water level L1.

  The second electrode 103 is connected to the lead wire 43. A terminal 44 is fixed to the end of the lead wire 43 of the second electrode 103. The second electrode 103 is fixed to the third input terminal portion 73 via the terminal 44. The second electrode 103 is formed in a rod shape whose tip is located at the second water level L2.

  The third electrode 104 is connected to the lead wire 43. A terminal 44 is fixed to the lead wire 43 of the third electrode 104. The terminal 44 of the lead wire 43 of the third electrode 104 is fixed to the fifth input terminal portion 75. The third electrode 104 is formed in a rod shape whose tip is located at the third water level L3.

  When the water level in the water tank 20 rises to the first water level L1, the common electrode 101 and the first electrode 102 are electrically connected through the water in the water tank 20. When the control unit 81 detects that the common electrode 101 and the first electrode 102 are energized via the circuit unit 78, the control unit 81 determines that the water level is equal to or higher than the first water level L1.

  When the water level in the water tank 20 rises to the second water level L2, the common electrode 101 and the second electrode 103 are electrically connected through the water in the water tank 20. When detecting that the common electrode 101 and the second electrode 103 are energized via the circuit unit 78, the control unit 81 determines that the water level is equal to or higher than the second water level L2.

  When the water level in the water tank 20 rises to the third water level L3, the common electrode 101 and the third electrode 104 are electrically connected via the water in the water tank 20. When detecting that the common electrode 101 and the third electrode 104 are energized via the circuit unit 78, the control unit 81 determines that the water level is equal to or higher than the first water level L1.

  The storage unit 80 stores (N−1) number of first threshold values, where N is the number of pump devices 30. If it is determined that the first time t1 is less than the first smallest threshold, the control unit 81 determines that all the pump devices 30 are driven.

  When m is 2 and the first time t1 is less than the second smallest threshold, the control unit 81 determines that (N−1) pump devices are driven.

  Further, the control unit 81 determines that m is 2 or more and the first time t1 is equal to or more than a first threshold that is the mth smallest and less than the (m + 1) th smallest first threshold (N -M) It is determined that the pump device is driven.

  Furthermore, when the first time t1 is equal to or greater than the first threshold value that is the maximum among the first threshold values, one pump device is driven.

  The minimum first threshold value among the plurality of first threshold values is, for example, a state in which sewage in the water tank 20 is filled up to the second water level L2, and sewage of a predetermined flow rate is flowing into the water tank 20. , The time until the water level in the water tank 20 drops from the second water level L2 to the first water level L1 as each of the pump devices 30 is driven. The pump device 30 performs an operation in which the rotation speed of the motor becomes a predetermined rotation speed determined in advance.

  When m is 2 or more, the (N−m) th smallest first threshold value is, for example, that sewage in the water tank 20 is filled up to the second water level L2, and sewage with a predetermined flow rate is stored in the water tank 20. This is the time until the water level in the water tank 20 drops from the second water level L2 to the first water level L1 by driving each of the Nm pump devices 30 in the inflowing state. The pump device 30 performs an operation in which the rotation speed of the motor becomes a predetermined rotation speed determined in advance.

  Among the plurality of first threshold values, the maximum first threshold value is, for example, a state in which the sewage in the water tank 20 is filled up to the second water level L2 and the sewage of a predetermined flow rate is flowing into the water tank 20. The time until the water level in the water tank 20 drops from the second water level L2 to the first water level L1 as each of the pump devices 30 is driven. The pump device 30 performs an operation in which the rotation speed of the motor becomes a predetermined rotation speed determined in advance.

  A drainage device 10 according to a second embodiment of the present invention will be described with reference to FIGS. In addition, the structure which has the same function as 1st Embodiment attaches | subjects the code | symbol same as 1st Embodiment, and abbreviate | omits description. FIG. 8 is a schematic view showing the drainage device 10A. 9-12 is a flowchart which shows an example of operation | movement of 10 A of drainage apparatuses. The drainage device 10 </ b> A is formed such that when sewage is stored in the water tank 20 to a predetermined water level, the sewage can be pumped to the secondary side.

  As shown in FIG. 8, the drainage device 10A includes a water tank 20 capable of storing sewage, a plurality of pump devices 30 disposed in the water tank 20, a plurality of water level detectors 40, 50, 60, 110, and a plurality of water devices. A control device (control means) 70 capable of controlling the pump device 30 is provided.

  In the present embodiment, as an example, four pump devices 30 are used as in the first embodiment.

  In the present embodiment, the water level detector is equal to or less than the number of pump devices 30 that can detect the third water level detector 60 that detects the third water level L3, and water levels at different heights that are less than the third water level L3. A plurality of water level detectors are used. That is, the drainage device 10A includes, in addition to the third water level detector 60 that detects the third water level L3, one water level detector and a plurality of pumps that are used for stopping the driving of the plurality of pump devices 30. If the number of devices 30 is N, (N-1) or less water level detectors are provided. In the present embodiment, three water level detectors capable of detecting different water levels below the third water level L3 are used as an example.

  In the present embodiment, specifically, the water level detector includes a first water level detector 40 configured to detect the first water level, and a second water level detection configured to detect the second water level. 50, a third water level detector 60 configured to detect the third water level, and a fourth water level L4 that is a water level between the second water level L2 and the third water level L3. The fourth water level detector 110 is provided.

  It should be noted that the fourth water level L4 is corrected even if the number of pump devices 30 driven is corrected based on the fact that the fourth water level L4 is detected by the fourth water level detector 110, as will be described later. By driving the number of pump devices 30 that have been set, the water level is such that the efficiency of the drainage device 10A is improved. The improvement of efficiency here means that the time until the water level in the water tank 20 is lowered to the first water level L1 is shorter than the case where the number before correction is driven.

  The fourth water level detector 110 uses the same float switch as the first water level detector 40. For this reason, each part of the 4th water level detector 110 attaches | subjects the same code | symbol as the 1st water level detector 40, and abbreviate | omits description. In the fourth water level detector 110, when the water level becomes equal to or higher than the fourth water level L4, the float 41 is tilted by receiving buoyancy from the sewage, and the switch 42 transmits an ON signal.

  The control device 70 includes an electromagnetic contactor 76, an ammeter 77, a circuit unit 78 to which each water level detector 40, 50, 60, 110 is connected, a timer 79, a storage unit 80 for storing information such as a plurality of threshold values, and the like. The control unit 81 is included.

  The circuit part 78 is formed so that the lead wires 43 of the water level detectors 40, 50, 60, 110 can be connected via the terminals 44. Specifically, the circuit unit 78 includes a first input terminal unit 71, a second input terminal unit 72, a third input terminal unit 73, a fourth input terminal unit 74, a fifth input terminal unit 75, It has a sixth input terminal portion 111 and a seventh input terminal portion 112.

  Each input terminal portion 71, 72, 73, 74, 75, 111, 112 is formed with a screw hole into which the screw 90 can be screwed.

  The sixth input terminal portion 111 is fixed by the screw 90 inserted through the terminal portion 44b of one lead wire 43 of the fourth water level detector 110 being screwed. The seventh input terminal portion 112 is fixed by the screw 90 inserted through the terminal portion 44b of the other lead wire 43 of the fourth water level detector 110 being screwed.

  The timer 79 is configured to be able to measure a first time t1 until the water level in the water tank 20 rises from the first water level L1 to the second water level L2. The timer 79 is formed so as to be able to measure the second time t2 until the water level in the water tank 20 drops from the second water level L2 to the first water level L1.

  The timer 79 is formed so as to be able to measure the third time t3 until the water level in the water tank 20 rises from the first water level L1 to the fourth water level L4. The timer 79 is formed so as to be able to measure the fourth time t4 until the water level in the water tank 20 drops from the fourth water level L4 to the first water level L1.

  The storage unit 80 includes a first threshold value used for determining the number of pump devices 30 to be driven, a correction coefficient K for correcting the first threshold value, a second threshold value X used for determining the idling of the pump, and a third time. A second correction coefficient K2 for correcting t3 and the fourth time t4 is stored. The storage unit 80 is configured to be able to store the number m of determinations for determining the number of units.

  The first threshold is a threshold that is compared with the first time t1. When the number of pumps is N, (N−1) number of first threshold values are stored in the storage unit 80. In the present embodiment, since four pump devices 30 are used, the first number determining threshold value T1, the second number determining threshold value T2, and the third number determining threshold value T3 are used as the first threshold values. Is stored in the storage unit 80.

  The second correction coefficient K2 is a coefficient used for estimating the first time t1 from the third time t3 and for estimating the second time t2 from the fourth time t4.

  For example, the second correction coefficient K2 is a constant that divides the third time t3 and the fourth time t4. For example, the second correction coefficient K2 is a value obtained by dividing the height from the first water level L1 to the fourth water level L4 by the height from the first water level L1 to the second water level L2.

  The determination number m of the number determination is the number of comparisons between the first time t1 and the first number determination threshold T1, the second number determination threshold T2, and the third number determination threshold T3.

  The controller 81 is configured to be able to detect the outputs of the water level detectors 40, 50, 60, and 110. The control unit 81 is configured to be able to control the timer 79, and stores the first time t 1, the second time t 2, the third time t 3, and the fourth time t 4 measured by the timer 79 in the storage unit 80. It is made possible.

  The control unit 81 is configured to be able to store the determination count m in the storage unit 80. For example, the control unit 81 can control the pump device 30 by controlling the electromagnetic contactor 76 so that the pump device 30 performs an operation in which the rotation number of the motor becomes the above-described predetermined rotation number. Is formed.

  In addition, the control unit 81 can detect a plurality of different water levels that are equal to or less than the number of the pump devices 30 other than the third water level detector 60 used for the determination of driving all the pump devices 30. Among these, the water level detector for detecting the lowest water level is used as the first water level detector of the present invention, and the water level detector for detecting the water level next to the water level detected by the first water level detector is the present invention. Used as a second water level detector. In the present embodiment, the controller 81 uses the first water level detector 40 as the first water level detector of the present invention, and the second water level detector 50 as the second water level detector of the present invention. Use.

The control unit 81 further has the following functions 1 to 6.
Function 1 is a function for determining the number of pump devices 30 to be driven in accordance with the rising speed of the water level in the water tank 20. Specifically, the first time t1, which is the time until the water level rises from the first water level L1 to the second water level L2, is compared with the first threshold value, and the pump device is based on the comparison result. This is a function for determining the number of 30 drives.

  With this function, the controller 81 first compares the first time t1 with the first number determination threshold value T1, and determines that the first time t1 is less than the first number determination threshold value T1. The number of pump devices 30 to be driven is determined to be four. When the control unit 81 determines that the first time t1 is equal to or greater than the first number determination threshold value T1, the control unit 81 compares the first time t1 with the second number determination threshold value T2, and compares the first time t1 with the first number determination threshold value T1. Is determined to be less than the second number determination threshold value T2, the number of pump devices 30 to be driven is determined to be three.

  When the control unit 81 determines that the first time t1 is equal to or greater than the second number determination threshold T2, the control unit 81 compares the first time t1 with the third number determination threshold T3, If the time t1 is determined to be less than the third number determination threshold value T3, the number of driven pump devices 30 is determined to be two. When the control unit 81 determines that the first time t1 is equal to or greater than the third number determination threshold, the control unit 81 determines the number of pump devices 30 to be driven as one.

  When the function 2 determines that the drainage capacity of sewage due to the driving of the number of pump devices 30 determined by the function 1 is excessive, the first number is set so that the number of drainage capacity can be determined appropriately. This function corrects the threshold value.

  When the pump device 30 is driven, the control unit 81 performs the second time t2 until the water level in the water tank 20 drops from the second water level L2 to the first water level L1, and the water level in the water tank 20 is the first. In order to reduce the number of pump devices 30 to be driven by determining that the drainage capacity of the pump device 30 is excessive when it is equal to or less than the first time t1 until the water level L1 rises to the second water level L2. Each of the number determination thresholds T1, T2, T3 is multiplied by a correction coefficient K to correct each of the number determination thresholds T1, T2, T3.

  Function 3 is a function of determining that the pump device 30 is idling when the detection value of the ammeter 77 is equal to or less than the second threshold value X, and stopping the pump device 30 that is judged to be idling.

  Function 4 is that when the second water level detector 50 is turned on while the first water level detector 40 is off, the first time t1 cannot be measured, and the first water level detector 40 has a problem. This is a function for driving all the pump devices 30.

  When the function 5 determines that the second water level detector has failed, the water level detector that detects the next higher water level is used as the second water level detector, and the first time t1 and the second time t2 are detected. Is stored in the storage unit 80.

  In the present embodiment, the function 5 specifically uses the fourth water level detector 110 as a substitute for the second water level detector 50, and the water level rises from the first water level L1 to the fourth water level L4. This is a function of estimating the first time t1 using the second correction coefficient K2 from the third time t3, which is the time until the time, and storing the estimated value in the storage unit 80 as the first time t1. . With this function, the control unit 81 stores a value obtained by dividing the second correction coefficient K2 from the third time t3 in the storage unit 80 as the first time t1.

  Further, the function 5 estimates the second time t2 using the second correction coefficient K2 from the fourth time t4 that is the time until the water level drops from the fourth water level L4 to the first water level L1. This is a function of storing the estimated value in the storage unit 80 as the second time t2. With this function, the control unit 81 stores a value obtained by dividing the second correction coefficient K2 from the fourth time in the storage unit 80 as the second time t2.

  The function 6 is the present invention among a plurality of water level detectors that are equal to or less than the number of pump devices 30 included in the drainage device 10A, except for the third water level detector 60 used for determining that all the pump devices 30 are driven. This function corrects the number of pumps to be driven based on the detection result of the water level detector that detects a water level higher than the water level detected by the water level detector used as the second water level detector.

Next, the operation of the drainage device 10A will be described with reference to FIGS.
First, the control unit 81 resets the first time t1, the second time t2, the third time t3, the fourth time t4, and the determination number m stored in the storage unit 80, and sets each of them. “0” is set (step ST1A).

  Next, the control unit 81 determines whether or not the first water level detector 40 is on. When the first water level detector 40 is not on (No in step ST2), the control unit 81 determines whether or not the second water level detector 50 is on. When it is determined that the second water level detector 50 is not on (No in step ST3), the control unit 81 continues monitoring until one of the water level detectors 40 and 50 is turned on.

  When determining that the first water level detector 40 is on (Yes in step ST2), the control unit 81 drives the timer 79 and starts measuring the first time t1 and the third time t3 (step step). ST4A).

  Next, the control unit 81 determines whether or not the second water level detector 50 is turned on. When determining that the second water level detector 50 is not on (NO in step ST5), the control unit 81 determines whether or not the fourth water level detector 110 is turned on (step 40).

  When determining that the fourth water level detector 110 is not on (NO in step ST40), the control unit 81 next determines whether or not the third water level detector 60 is on (step ST6). .

  When determining that the third water level detector 60 is not on (No in step ST6), the control unit 81 continues monitoring until any of the water level detectors 50, 60, 110 is turned on (in step ST5). Return).

  When determining that the second water level detector 50 is on (Yes in step ST5), the control unit 81 stops the timer 79, stops the measurement of the first time t1, and stores the first time t1. Store in unit 80 (step ST7).

  In addition, when the 4th water level detector 110 turns on in the state which the 2nd water level detector 50 has failed and is not turned on, ie, the 2nd water level detector 50 is off (in step ST5). NO), when the fourth water level detector 110 is turned on (YES in step ST40), the control unit 81 stops the timer 79 to stop the measurement of the third time t3, and the third time t3 is stored in the storage unit 80 (step ST41).

  Next, the control unit 81 determines whether or not the first time t1 is “0” (step ST42). When measuring the first time t1 (step ST7), the controller 81 determines that the first time t1 is not “0” (NO in step ST42). When the control unit 81 measures the third time t3 (step ST41) and determines that the first time t1 is “0” (Yes in step ST42), the second water level detector 50 fails. The first time t1 is estimated from the third time t3, and this estimated value is stored in the storage unit 80 as the first time t1. Specifically, the control unit 81 stores a value obtained by dividing the second correction coefficient K2 from the third time t3 in the storage unit 80 as the first time t1 (step ST43).

  Next, the control unit 81 compares the first time t1 with the number determination thresholds T1, T2, and T3. First, in order to compare the first time t1 and the first number determination threshold value T1, the control unit 81 adds 1 to m to m = 1 (step ST8), and stores the number of determinations m in the storage unit 80. To remember. Next, the controller 81 compares the first time t1 with the first number determination threshold value T1 (step ST9). If it is determined that the first time t1 is less than the first number determination threshold value T1 (Yes in step ST9), it is determined that four pump devices 30 are necessary, and the number of pump devices 30 to be driven is all set. The four units are determined, and the electromagnetic contactor 76 is controlled to drive the four pump devices 30 (step ST10).

  Or if the control part 81 judges that 1st time t1 is more than the 1st number determination threshold value T1 (No of step ST9), the frequency | count m of judgment will be less than 4 used as the total number of pump apparatuses 30. It is determined whether or not there is (step ST11).

  Alternatively, when the control unit 81 determines that the determination number m is smaller than 4 that is the total number of pump devices 30 (Yes in step ST11), the control unit 81 adds 1 to the determination number m and stores it as two times. 80 (step ST12).

  Alternatively, when determining that the determination number m is 4 or more of the pump device 30 (No in step ST11), the control unit 81 determines that the determination of the number of pump devices 30 to be driven cannot be made any more, and the previous time The number determined to be excessive as the number of drives by the determination is determined as the number of drives. Specifically, the number of pump devices 30 to be driven is determined to be four (step ST10).

  Next, the control unit 81 compares the first time t1 with the second number determination threshold value T2. The control unit 81 determines that the first time t1 is less than the second number determination threshold T2 (Yes in step ST13), and further, if the fourth water level detector 110 is not on, the water level is It is determined that it is relatively low (No in step ST44). Then, it is determined that three pump devices 30 are necessary, and the electromagnetic contactor 76 is controlled to drive the three pump devices 30 (step ST14). If the fourth water level detector 110 is on, the control unit 81 determines that the water level is relatively high, corrects the number of pumps to be driven, and increases the number of pumps by four (Yes in step ST44, and Step ST10).

  Or if the control part 81 judges that 1st time t1 is more than 2nd number determination threshold value T2 (No of step ST13), the frequency | count m of judgment will be less than 4 used as the total number of pump apparatuses 30. (Step ST15).

  In step ST15, since the number of determinations m is two, the control unit 81 determines that the number of determinations m is less than 4, which is the total number of pump devices 30 (Yes in step ST15), and the number of determinations m 1 is added, and the number of determinations m is set to 3 and stored in the storage unit 80 (step ST16).

  Alternatively, if it is determined that the determination count m is equal to or greater than the total number of pump devices 30 (No in step ST15), then, based on whether or not the fourth water level detector 110 is on (step ST44). The number of pump devices 30 to be driven is determined, and the determined number of pump devices 30 are driven by controlling the electromagnetic contactor 76 (step ST10 and step ST14).

  Next, the control unit 81 compares the first time t1 with the third number determination threshold value T3 (step ST17). The control unit 81 determines that the first time t1 is less than the third number determination threshold value T3 (Yes in step ST17), and if the fourth water level detector 110 is not on (in step ST45). No), it is judged that the water level is relatively low. Then, it is determined that two pump devices 30 are necessary, and the electromagnetic contactor 76 is controlled to drive the two pump devices 30 (step ST18). When the control unit 81 determines that the fourth water level detector 110 is on, the control unit 81 determines that the water level is relatively high, and corrects the number of pump devices 30 to be one by three (step ST45). Yes and step ST14).

  Or if the control part 81 judges that 1st time t1 is more than 3rd number determination threshold value T3 (No of step ST17), the frequency | count m of judgment will be less than 4 used as the total number of pump apparatuses 30. It is determined whether or not there is (step ST19).

  Since the number of determinations m is 3, the control unit 81 determines that the number of determinations m is less than 4 that is the total number of pump devices 30 (Yes in step ST19). Next, it is determined whether or not the fourth water level detector 110 is on (step ST46). When determining that the fourth water level detector 110 is not on (No in step ST46), the control unit 81 determines that the water level is relatively low. Then, it is determined that one pump device 30 is necessary, and the electromagnetic contactor 76 is controlled to control the electromagnetic contactor 76 to drive one pump device 30 (step ST20). Or if the control part 81 judges that the 4th water level detector 110 is ON (Yes of step ST46), it will judge that the water level is comparatively high, will correct | amend the number of drive of the pump apparatus 30, and will be 1 unit | set. The number is increased to three (step ST18).

  Alternatively, if it is determined that the determination number m is not less than 4 which is the total number of pump devices 30 (No in step ST19), then the pump is determined based on whether or not the fourth water level detector 110 is on. The number of devices 30 to be driven is determined, and the determined number of pump devices 30 are driven by controlling the electromagnetic contactor 76 (step ST45, step ST14, and step ST18).

  As described above, when the number of pump devices 30 to be driven is determined in steps ST10, ST14, ST18, and ST20, the control unit 81 determines each of the pump devices 30 being driven based on the detection result of the ammeter 77. The current value supplied to is monitored (step ST21).

  Next, the control unit 81 determines whether or not the third water level detector 60 is off (step ST22). When determining that the third water level detector 60 is not OFF (No in step ST22), the controller 81 drives four pump devices 30 (step ST10).

  Or if the control part 81 judges that the 3rd water level detector 60 is off (Yes of step ST22), it will be judged next whether the 4th water level detector 110 is on (step ST22). Step ST47). When determining that the fourth water level detector 110 is not on (No in step ST47), the control unit 81 next determines whether or not the second water level detector 50 is off (step ST23). .

  When determining that the fourth water level detector 110 is on (Yes in step ST47), the control unit 81 monitors until the fourth water level detector 110 is turned off (No in step ST48). When the fourth water level detector 110 is turned off, the control unit 81 starts measurement at the fourth time t4 (Yes in step ST48 and step ST49). Next, the control unit 81 determines whether or not the second water level detector 50 is off (step ST23).

  When the control unit 81 determines that the second water level detector 50 is OFF (Yes in step ST23), the control unit 81 controls the timer 79 and starts measurement of the second time t2 (step ST24).

  Next, the control unit 81 determines whether or not the first water level detector 40 is off (step ST25). When determining that the first water level detector 40 is off (Yes in step ST25), the control unit 81 stops the pump device 30 (step ST26).

  In addition, the control unit 81 stops the timer 79 and stops the measurement of the second time t2 and the fourth time t4. Then, the information of the measured second time t2 and fourth time t4 is stored in the storage unit 80 (step ST27A).

  Next, the control unit 81 determines whether or not the times t1 and t2 stored in the storage unit 80 are both “0” (step ST28). When the control unit 81 determines that the times t1 and t2 are not “0” (Yes in step ST28), the control unit 81 then compares the times t1 and t2.

  When determining that the first time t1 is equal to or longer than the second time t2 (Yes in step ST29), the controller 81 determines that the number of pump devices 30 to be driven is larger than the required number. Then, the control unit 81 corrects the number determination threshold values T1, T2, T3 by multiplying the number determination threshold values T1, T2, T3 by the correction coefficient K (step ST30), and corrects the number determination threshold values. The threshold values T1, T2, T3 are stored in the storage unit 80. And the control part 81 returns to the process of step ST1A.

  Or if the control part 81 judges that 1st time t1 is not more than 2nd time t2 (No of step ST29), it will judge that the drive number of the pump apparatus 30 was suitable, and threshold value T1 for number determination. , T2, T3 are not corrected, and the process returns to step ST1A.

  Alternatively, when the first time t1 is not “0” and the second time t2 is “0” (No in step ST28), the control unit 81 causes the second water level detector 50 to fail. 2 is determined to have failed to be measured (Yes in step ST50), the second time t2 is estimated from the fourth time t4, and this estimated value is stored in the storage unit 80 as the second time t2. . Specifically, the control unit 81 stores a value obtained by dividing the second correction coefficient K2 from the fourth time t4 in the storage unit 80 as the second time t2 (step ST51). And the control part 81 compares 2nd time t2 estimated based on 4th time t4, and 1st time t1 (step ST29). In addition, when the first time t1 is “0” and the second time t2 is not “0” in step ST28 (No in step ST28, No in step ST50), the control unit 81 proceeds to step ST1A. Return.

  Further, when determining in step ST3 that the second water level detector 50 is not OFF, the control unit 81 determines that there is a problem with the first water level detector 40 (Yes in step ST3), and the second Without measuring 1 time t1, 1 is added to the number of determinations m to make one (step ST8), and the number of determinations m is stored in the storage unit 80 (step ST8). Thereafter, steps after step ST8 are performed.

  Here, as a malfunction of the first water level detector 40, for example, a foreign substance in the water tank 20 becomes entangled with the float 41 of the first water level detector 40, the float 41 becomes unable to tilt, and an on signal cannot be transmitted. There is a bug. Alternatively, there is a problem that the switch 42 of the first water level detector 40 fails and the ON signal cannot be transmitted.

  If the water level in the water tank 20 is equal to or higher than the second water level L2 in a state where the first water level detector 40 cannot transmit the ON signal, the first water level detector 40 remains off and the second water level The detector 50 is turned on.

  Since the first water level detector 40 cannot transmit the ON signal, the control unit 81 does not measure the first time t1. The first time t1 is set to “0” in step ST1A. A value other than “0” is stored for the second time t2. For this reason, the control unit 81 determines that the first time t1 is “0” in step ST28, and does not perform steps ST29 and ST30 (No in step ST28).

  Further, in step ST25, the control unit 81 determines that the first water level detector 40 is on (No in step ST25), and the pump device 30 idles based on the detection result of the ammeter 77. If it is determined (Yes in step ST31), it is determined that a problem has occurred in the first water level detector 40, and the pump device 30 is stopped (step ST32). The control unit 81 stops in order from the pump device 30 that has detected idling. Further, the control unit 81 monitors until all the pump devices 30 that have been driven stop. When all the pump devices 30 that have been driven stop, the process proceeds to step ST27A. When step ST31 is No, it returns to step ST25.

  Here, the malfunction of the first water level detector 40 is, for example, that foreign matter in the water tank 20 becomes entangled with the float 41 of the first water level detector 40, and the float 41 cannot return from the tilted position. For example, or a failure in which the switch 42 of the first water level detector 40 breaks down and continues to transmit an ON signal.

  If the control unit 81 determines in step ST6 that the third water level detector 60 is on (Yes in step ST6), the control unit 81 determines that there is a problem in the second water level detector 50, and the pump All devices 30 are driven (step ST33). Thereafter, the control unit 81 continues to monitor the third water level detector 60 (No in Step ST34). When the third water level detector 60 is turned off (Yes in Step ST34), the first water level detector 40 is used. Is determined to be off (step ST25).

  In addition, when the control unit 81 determines that the second water level detector 50 is not OFF (No in step ST23) and determines that the first water level detector 40 is OFF (Yes in step ST35), the ammeter 77 Based on the detected result, the current value supplied to each of the pump devices 30 being driven is compared with the second threshold value X to determine whether or not the pump device 30 is idling (step ST36).

  If the control unit 81 determines that any one of the pump devices 30 is idling (Yes in step ST36), the control unit 81 controls the electromagnetic contactor 76 to stop the pump device 30 that is idling (step step). ST37).

  When it is determined that the pump device 30 is not idling (No in step ST36), the control unit 81 continuously monitors the current value supplied to the pump device 30. In addition, when all the pump devices 30 that have been driven are stopped, the control unit 81 proceeds to step ST27A.

  Or the pump apparatus 30 will stop the pump apparatus 30 by which the idling judgment was carried out, if the idling of the pump apparatus 30 was judged (step ST37).

  In the drainage device 10A configured as described above, the same effect as in the first embodiment can be obtained. Further, except for the third water level detector 60 used for the determination of driving all the pump devices 30, there are three or more water level detectors smaller than the number of pump devices 30 used, By measuring or estimating the first time t1 and the second time t2 using any two of the water level detectors, it is possible to cope with any of the plurality of water level detectors failing.

  In addition, two of the three or more water level detectors other than the third water level detector 60, which are fewer than the number of the pump devices 30, are used as the first water level detector and the second water level detector, and the remaining water level is used. By using the detector as a substitute for the second water level detector when it is determined that the second water level detector has failed, the number of water level detectors can be reduced to the number of pump devices 30 or less. It is possible to deal with failures.

  In addition, this invention is not limited to the said embodiment. In the above embodiment, flow switch type water level detectors 40, 50, 60, and 110 are used as the water level detectors. As another example, as shown in FIG. 13, an electrode-type water level detector 120 capable of detecting the water levels L1, L2, L3, and L4 may be used. In the water level detector 120, the structure which has the same function as the water level detector 100 is attached | subjected with the same code | symbol, and description is abbreviate | omitted.

  The water level detector 120 includes a common electrode 101, a first electrode 102, a second electrode 103, a third electrode 104, and a fourth electrode 121.

  The fourth electrode 121 is connected to the lead wire 43. A terminal 44 is fixed to the lead wire 43 of the fourth electrode 121. The terminal 44 of the lead wire 43 of the fourth electrode 121 is fixed to the seventh input terminal portion 112. The tip of the fourth electrode 121 is formed in a rod shape whose tip is located at the fourth water level L4.

  When the water level in the water tank 20 rises to the first water level L1, the common electrode 101 and the first electrode 102 are electrically connected through the water in the water tank 20. When the control unit 81 detects that the common electrode 101 and the first electrode 102 are energized via the circuit unit 78, the control unit 81 determines that the water level is equal to or higher than the first water level L1.

  When the water level in the water tank 20 rises to the second water level L2, the common electrode 101 and the second electrode 103 are electrically connected through the water in the water tank 20. When detecting that the common electrode 101 and the second electrode 103 are energized via the circuit unit 78, the control unit 81 determines that the water level is equal to or higher than the second water level L2.

  When the water level in the water tank 20 rises to the fourth water level L4, the common electrode 101 and the fourth electrode 121 are electrically connected through the water in the water tank 20. When the control unit 81 detects that the common electrode 101 and the first electrode 102 are energized via the circuit unit 78, the control unit 81 determines that the water level is equal to or higher than the first water level L1.

  When the water level in the water tank 20 rises to the third water level L3, the common electrode 101 and the third electrode 104 are electrically connected via the water in the water tank 20. When the control unit 81 detects that the common electrode 101 and the fourth electrode 121 are energized via the circuit unit 78, the control unit 81 determines that the water level is equal to or higher than the first water level L1.

  In the present embodiment, the first time t1 is estimated by correcting the third time t3. This is because the first threshold value is determined based on the height between the first water level detector 40 and the second water level detector 50. For example, when the first threshold value determined based on the height between the first water level detector 40 and the fourth water level detector 110 is stored in the storage unit 80, the third time t3 is set to the second time t3. The third time t3 may be compared with a first threshold determined based on the height between the first water level detector 40 and the fourth water level detector 110 without being corrected by the correction coefficient K2. it can. That is, the third time t3 can be used as it is as the first time in the present invention without correction.

  When the third time t3 is used as it is as the first time in the present invention without correction, it can be used as it is as the second time of the present invention without correcting the fourth time t4. .

  In the first embodiment and the second embodiment, only the pump device 30 that has been determined to run idle is stopped (step ST36 and step ST37, or step ST31 and step ST32). Then, when all the pump devices 30 that were being driven are stopped, the process proceeds to step ST27 or step ST27A.

  In another example, for example, when it is determined in steps ST31 and ST36 that any one of the pump devices 30 is idling, in steps ST32 and ST37, driving of all the pump devices 30 that are driven is stopped. May be.

  In the first and second embodiments, in steps ST11, ST15, and ST19, the number m of determinations in which the first time t1 and the first threshold are compared, that is, the number m of comparisons, and the pump device. The number N of 30 is compared to determine whether N> m. This is because the number of operating pump devices 30 decreases as the number of comparisons m increases. In Steps ST11, ST15, and ST19, if the determination is No, that is, if N ≦ m, the number of pump devices 30 to be driven cannot be determined.

  Therefore, N> m is determined in steps ST11, ST15, and ST19. If this determination is No, that is, if N ≦ m, the number of pump devices 30 to be driven is increased by one. .

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above.

  DESCRIPTION OF SYMBOLS 10 ... Drainage apparatus, 10A ... Drainage apparatus, 20 ... Water tank, 30 ... Pump apparatus, 40 ... 1st water level detector, 50 ... 2nd water level detector, 60 ... 3rd water level detector, 70 ... Control apparatus (Control means), 77 ... ammeter, 80 ... storage unit, 81 ... control unit, 110 ... fourth water level detector, L1 ... first water level, L2 ... second water level, L3 ... third water level, L4 ... Fourth water level.

Claims (12)

A plurality of pump devices arranged in the aquarium and draining the water in the aquarium out of the aquarium;
A first water level detector for detecting a first water level in the water tank;
A second water level detector for detecting a second water level higher than the first water level in the water tank;
A storage unit that stores (N-1) number of first threshold values used for determining the number of pump devices to be driven, where N is the number of pump devices;
Based on the detection results of the first water level detector and the second water level detector, a first time until the water level in the water tank rises from the first water level to the second water level is measured. The number of pump devices to be driven is determined based on the comparison result between the first time and the first threshold, the determined number of the pump devices are driven, and the detection of the first water level detector When it is determined that the water level in the water tank has decreased to the first water level based on the result, control means for stopping the pump device;
A drainage device comprising: The control means performs a second operation until the water level in the water tank drops from the second water level to the first water level based on detection results of the first water level detector and the second water level detector. When the first time is compared with the second time and it is determined that the first time is equal to or greater than the second time, the first threshold value is set to a larger value. It correct | amends. The drainage device of Claim 1 characterized by the above-mentioned. Comprising an ammeter for detecting the current supplied to the pump device;
The storage unit stores a second threshold value used for determination of idling of the pump device,
2. The drain according to claim 1, wherein the control unit stops the pump device when judging that the pump device is idling based on a comparison between the detection result of the ammeter and the second threshold value. apparatus. Using the first water level detector for detecting the first water level in the water tank and the second water level detector for detecting the second water level higher than the first water level in the water tank, the first water level detector Measuring a first time from a water level to rising to the second water level;
The first time is compared with a first threshold value used to determine the number of pump devices to be driven, and based on the comparison result, the number of pump devices to be driven is drained out of the water tank. A method for controlling a drainage device, characterized in that it is determined. Measuring a second time until the water level in the water tank drops from the second water level to the first water level;
Comparing the first time and the second time, and determining that the first time is equal to or greater than the second time, the first threshold value is corrected to a larger value. The control method of the drainage device according to claim 4. The current value supplied to the pump device is compared with a second threshold value used to determine the idling of the pump device, and when the idling of the pump device is judged based on the comparison result, the pump device is stopped. The control method of the drainage device according to claim 4 characterized by things. It comprises a water level detector that detects a plurality of different water levels that are less than or equal to the number of pump devices,
The control means uses any one of the plurality of water level detectors as the first water level detector, and uses any one of the remaining water level detectors as the second water level detector. The drainage device according to claim 1. When the control means determines that the second water level detector has failed, the control means detects a water level next to the water level detected by the water level detector determined to have failed among the plurality of water level detectors. The drainage device according to claim 7, wherein the water level detector is used as a second water level detector. The said control means performs correction | amendment which increases the drive number of the said pump apparatus driven based on the detection result of the water level detection apparatus which detects a water level higher than a said 2nd water level detector. The drainage device described. Any one of water level detectors that detect a plurality of different water levels that are equal to or less than the number of pump devices is used as the first water level detector, and any one of the remaining water level detectors is the second water level detector. The drainage device control method according to claim 4, wherein the drainage device is used as a container. When it is determined that the second water level detector has failed, a water level detector that detects a water level next to the water level detected by the water level detector determined to have failed among the plurality of water level detectors. The drainage device control method according to claim 10, wherein the drainage device control method is used as a second water level detector. 11. The method for controlling a drainage device according to claim 10, wherein correction is performed to increase the number of pump devices to be driven based on a detection result of a water level detection device that detects a higher water level than the second water level detector. .