JP2014062505A - Water supply device, and method of operating water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply device in which starting frequencies of pumps are managed to a prescribed value, and a wasteful operation is excluded while equalizing operation loads in operating the plurality of pumps.SOLUTION: A water supply device in which a pump is continuously and forcibly operated on the basis of a forcible operation time variably set in a timer even when pump stop conditions are satisfied, includes: a cycle time setting portion for setting a time of one cycle of a pump operation; a calculating portion for subtracting a stop time just before the pump operation, and a remaining time when the operation time just before the pump operation is over the cycle time, from the set cycle time; and timer setting means setting 0 when a value of the result of the subtraction is negative, and setting the value when the value of the result of the subtraction is positive, as the forcible operation time.

Description

  The present invention suppresses the start frequency of the pump of the water supply apparatus constituted by one or more pumps by continuing the operation only for the set time of the timer even if the stop condition is satisfied, and the waste of the operation accompanying this. The present invention relates to a water supply apparatus that eliminates the problem and a method of operating the water supply apparatus.

  A small water supply device using a small-capacity pressure tank, regardless of whether it is an inverter type or non-inverter type, has a small pressure tank, so the pressure tends to drop and the pump start frequency tends to increase. In order to suppress the starting frequency, a method is employed in which a timer means is provided in the control system and the forced operation is performed only for the set time of the timer even if the pump stop condition is satisfied. However, in recent years, it has been strongly desired to eliminate unnecessary operation from the energy problem and increase the operation efficiency.

  There exists patent document 1 as a prior art of this. This is done by using the maximum value t1 of the forced operation time for the pump, the maximum value t2 of the operation stop time for the pump and the forced operation time timer, and measuring the previous stop time and comparing this value with the t2, If the time is less than t2, the time during operation is measured and this value is compared with t1. If the measured operation time is greater than t1, the forced operation timer is set to 0, and the measured operation time is t1. If it is smaller, the forced operation timer is set to t1-stop time, and if the previous stop time is larger than the result of comparing the previous stop time with t2, the forced operation timer is forced if it is determined whether the operation time is 10 seconds or more. The operation timer is set to 10 seconds, and the operation is continued only for the set time of the forced operation timer even if the stop condition is satisfied.

Japanese Patent No. 3011335

  The prior art shown in Patent Document 1 aims to suppress start-up frequency and eliminate useless operation, but management of start-up frequency to a predetermined value and equalization of operation of a plurality of pumps are considered. There is room for improvement.

  Therefore, in view of the prior art, an object of the present invention is to manage the pump start frequency to a predetermined value and to equalize the operation load when operating a plurality of pumps, and to eliminate wasteful operation and The operation method of a water supply apparatus is provided.

In order to solve the above problems, the present invention provides a water supply apparatus that continues to forcibly operate the pump based on the forced operation time that is variably set in the timer, even if the pump stop condition is satisfied.
A cycle time setting unit for setting the cycle time of the pump operation;
A calculation unit that subtracts the stop time immediately before the pump operation from the set cycle time and the extra time when the operation time immediately before the pump operation exceeds the cycle time;
When the value of the subtraction result in the arithmetic unit is negative, timer setting means is provided which sets 0 as the forced operation time when the value of the subtraction result is positive, and sets the value as the forced operation time when the value of the subtraction result is positive. And

  In the water supply apparatus described above, the cycle time setting unit sets the cycle time based on the number of pumps (units) and the pump start frequency (times / h).

  Moreover, in the water supply apparatus described above, the stop time immediately before the pump operation is a time from the stop of the self machine to the operation of the self machine.

  In the water supply apparatus described above, the stop time immediately before the pump operation is a time from the stop of the other machine to the operation of the self machine.

  Further, in the water supply apparatus described above, when the operation time of the pump exceeds the cycle time for a predetermined number of cycles, timer setting means for setting the forced operation time to 0 each time the pump operation time is exceeded is provided. It is characterized by that.

  Further, in the water supply apparatus described above, when the operation time of the pump exceeds the cycle time for two consecutive cycles, a timer setting means for setting the forced operation time to 0 each time it is exceeded is provided. Features.

Further, in order to solve the above problems, the present invention provides an operation method for a water supply apparatus in which a pump is continuously forcibly operated based on a forced operation time variably set in a timer even when a pump stop condition is satisfied. ,
Set the cycle time of the pump operation, subtract the stop time just before the pump operation and the extra time when the operation time just before the pump operation exceeds the cycle time from the set cycle time, and the value of this subtraction result will be In the case of negative, 0 is set as the forced operation time, and when the value of the subtraction result is positive, the pump is forcibly operated using the value as the forced operation time.

  According to the present invention, when the forced operation is performed only for the set time even when the stop condition is satisfied, the pump start frequency is managed to a predetermined value, and the operation load is equalized when operating a plurality of pumps. Driving can be eliminated. Further, as compared with the prior art, useless operation is further reduced, and parameters necessary for control can be easily set.

It is the piping system diagram and apparatus block diagram of the water supply apparatus of this invention Example. It is an operation characteristic figure of a constant speed pump. It is an operating characteristic figure of a variable speed pump. It is a control circuit diagram of the water supply apparatus of a constant speed pump. It is a control circuit diagram of the water supply apparatus of a variable speed pump. 3 is a time chart of the first embodiment. 4 is a time chart of Examples 2 and 3. FIG. 10 is a time chart of Example 4. It is explanatory drawing of the number of driving | operations of an Example, a mode, and cycle time. It is a flowchart of an Example. It is a flowchart of an Example. It is a flowchart of an Example. It is a flowchart of an Example. It is a memory | storage part memory map of an Example.

  The form for implementing this invention is demonstrated about the Example of a water supply apparatus using FIGS. 1-4.

  FIG. 1 shows a piping system diagram of an example water supply apparatus and shows two pumps as an example, but one or three or more pumps may be used. 1 is a water receiving tank that is a water source, and the water receiving tank 1 may be a water pipe. 2 is a water level detection means of the water receiving tank, and detects a plurality of levels E1 to E5 installed in the water receiving tank 1. 1a is for injecting tap water into the water receiving tank 1. For example, ball taps, 3-1, 3-2 are suction pipes, 4-1 to 4-4 are gate valves, 5-1 is driven by a motor 6-1, and the suction pipes. This is a pump (referred to here as No. 1 unit) that feeds water on the suction side to the demand side via 3-1. Similarly, 5-2 is a pump (referred to herein as No. 2 machine) that is driven by a motor 6-2 and supplies water on the suction side to the demand side via the suction pipe 3-2.

  8-1 and 8-2 are check valves, 9 is a water supply pipe, 10 is a pressure tank having air inside attached to the water supply pipe 9, and 11 (SW) is provided in the water supply pipe 9 and the pressure here Is a pressure detecting means (pressure sensor) that detects a pressure signal and generates a pressure signal in response thereto. 7-1 and 7-2 are upstream and downstream of the check valves 8-1 and 8-2, and are flow switches on the first and second units installed in the middle of the water supply pipe 9, and use an excessive amount of water. When the state is reached, the first contact is closed. Further, the flow rate switches 7-1 and 7-2 close the second contact when the second unit starts or stops. This flow switch is used as necessary.

  Reference numeral 12 denotes a control device that takes in signals from the pressure detection means 11 and the flow rate switches 7-1 and 7-2 and outputs operation command signals to the motors 6-1 and 6-2, and will be described in detail later. The motors 6-1 and 6-2 may be constant speed motors that are directly driven by a commercial power source or variable speed motors that are driven by an inverter or the like.

  FIG. 2 is an operation characteristic diagram when two pumps driven by a constant speed motor are operated, wherein the horizontal axis indicates the amount of water used and the vertical axis indicates the total head. Curve A is a QH performance curve when one pump is operating, curve B is a combined QH performance curve when two pumps are operating in parallel (synthesized by doubling the flow rate without changing the pressure head), In this example, two pumps having the same pump performance are shown in parallel, but the performance may be different.

  Here, PON is a pump start pressure head, and when a start command is issued for the second and subsequent units, a predetermined confirmation time is provided to avoid simultaneous start. That is, the first pump is started at the starting pressure PON or lower, and when the second pump is lower than the starting pressure PON, the second pump is checked again after a predetermined time. If it is not, the current operation state is maintained without starting.

  When the amount of water used decreases from Q1 when the two units are in parallel operation and is less than Q1, it is confirmed in a predetermined time whether the feed water pressure detected by the pressure sensor is equal to or higher than PB, and if true, the preceding variable speed pump 5- 1 is stopped, and the number is reduced to a single operation of 5-2. Further, when the amount of water used decreases and becomes less than the minimum water amount Qmin, the flow rate switch 7-2 (7-1 in the case of 5-1) is closed, the pump is stopped after a predetermined time has elapsed, and all stops. Due to the use of water, the pump to be operated next is not a pump stopped at an insufficient amount of water, but another pump that is on standby, and is operated alternately.

  Since the start of the third and subsequent units is clear as described above, a description thereof will be omitted. POFF is a pump stop pressure head, and when a second or subsequent stop command is issued, a predetermined confirmation time is provided to avoid simultaneous stop. This stop confirmation time is also the same as that at the time of starting, so the explanation is omitted.

  Furthermore, Q1 is the amount of water when one pump is started, Q3 is the amount of water when two pumps are started, Q2 is the amount of water when one pump is stopped, and Q4 is when two pumps are stopped (reduction from two to one) The amount of water, Qmin, indicates the stop flow rate when the pump is stopped by the flow rate switch.

  FIG. 3 is an operation characteristic diagram in which two pumps driven by a variable speed motor are operated in parallel, and the same reference numerals as those in FIG. 2 denote the same components. F is the pipe resistance when the maximum amount of water is allowed to flow through the water supply system of FIG. 1, and is a target for controlling the water supply pressure to a predetermined pressure (for example, constant control of the estimated terminal pressure). doing.

  Curve A is, for example, a QH performance curve when one pump is operated at an inverter frequency f0, and similarly, curves C, D, and E are pump pumps when operated at inverter frequencies f1, f2, and f3, respectively. It is a QH performance curve at the time of one unit operation. Curve B is a QH performance curve when two pumps are operated in parallel at an inverter frequency f0 (combined by double the amount of water while keeping the total head of QH curve A for one unit fixed) It is.

  The curve G shows that when the pressure control is performed so that the feed water pressure converges on the target resistance F as described above, the first pump is operated at the frequency f0 and the second pump is operated at the frequency f4. Thus, they intersect at PB on the resistor F. Curve B is a synthesized QH performance curve when two pumps are operated in parallel at frequency f0. Here, PA is a lower limit side target pressure (or may be equal to the starting pressure Pon), PB is an intermediate target pressure, and PC is an upper limit target pressure. Further, the frequency f3 is a frequency that gives the lower limit side target pressure PA, similarly, f1 and f2 are intermediate target pressures, and f0 (f0 × 2) is the frequency that gives the upper limit target pressure PC, and these values form coordinates. To do. The target F is approximated by a straight line passing through these coordinates.

  Next, the operation of the variable speed pump will be described with reference to FIG. For convenience of description, the description will be made assuming that all the pumps are initially stopped. When the water supply pressure decreases due to the use of water on the demand side, and the pressure detected by the pressure sensor 11 is equal to or lower than the starting pressure PON (which may be different in the embodiment, it may be different), the variable speed pump is 5-1 or 5-2 starts. Normally, Unit 5-1 starts first. After start-up, the estimated terminal pressure constant control is performed so as to follow the resistance F by operating one pump during the amount of water used Qmin to Q1.

  When the amount of water used increases and exceeds Q1, the frequency is f0 and it is confirmed in a predetermined time whether the feed water pressure detected by the pressure sensor is PB or less. If true, the variable speed pump 5-2 is started and 2 It becomes stand parallel operation. In the case of no, the above-mentioned one-unit operation is continued until it becomes true. After the two pumps are operated in parallel, the estimated terminal pressure constant control is performed along the resistance F during the amount of water used Q1 to Q3.

  Now, when the amount of water used decreases from the state of parallel operation of two units and becomes less than Q1, the frequency becomes f0 or less, and it is confirmed in a predetermined time whether the water supply pressure detected by the pressure sensor 11 is PB or more. The preceding variable speed pump 5-1 is stopped, and one-unit operation (decrease) of 5-2 is performed. Furthermore, when the amount of water used decreases and becomes less than the minimum amount of water Qmin, the flow rate switch 7-2 (7-1 in the case of 5-1) operates, and after a predetermined time elapses, the pump stops and stops completely. After this, the pump to be operated next by using water is not the pump that was stopped last, but another pump that is on standby (the variable speed pump 5-1 in the above), and operates alternately.

  The predetermined time is a predetermined time for suppressing the pump start frequency and eliminating the pump waste operation, and details will be described later. Furthermore, the estimated terminal pressure constant control referred to here means that the resistance F is the target pressure as described above, and the frequency of the inverter is controlled so that the feed water pressure detected by the pressure sensor follows this, thereby controlling the rotational speed of the pump. It is. The operation of three or more pumps will be omitted because it is clear from the above description.

  FIG. 4 is a control circuit diagram when two pumps driven by the constant speed motor according to the embodiment of the present invention are operated in parallel, and mainly shows the inside of the control device 12. In the figure, R, S, and T are power supplies, and ELB is an earth leakage breaker, which performs earth leakage protection for the subsequent systems. R and S are control power supplies, 52P1a is a main circuit contact of a switch for the No. 1 pump motor IM, and 52P2a is a main circuit contact of a switch for the No. 2 pump motor IM. The coils 52P1 and 52P2 are excited and opened by the command signal. 49P1 is a thermal relay thermal element part for the No. 1 pump motor, 49P2 is a thermal relay thermal element part for the No. 2 pump motor, and when these are operated by overload, the contacts 49P1b and 49P2b are opened, Protect Unit 1 pump motor and Unit 2 pump motor from overload respectively.

  FU is a fuse for short-circuit protection of the control circuit, SS is an on / off switch, and TR is a transformer for creating a low voltage power source for the control unit CU (described later). The CU includes a CPU (central processing unit), a memory M, a setting unit display unit OP, a stabilized power supply Z, input / output circuit units I / O1 to I / O3, an analog input circuit unit D / A, and input / output terminals TB1 to TB6. A control unit provided with a printed circuit board or the like.

  The setting unit display unit OP includes a setting unit (cycle time setting unit) 17 and a display unit 18. In the cycle time setting unit 17, the operation mode selection, the input of the number of canals, the pump start frequency (times / unit) The cycle time is set based on the input of, and the set cycle time is stored in the memory M.

  Reference numeral 11 denotes pressure detection means, and the detected pressure signal is taken into the CPU via the input terminal TB4 and the analog input circuit unit I / O3. Open / close signals of the flow switches 7-1 and 7-2 are taken into the CPU via the input terminals TB5 and TB6. These pressure signals and flow switch opening / closing signals are stored in the storage unit M via the CPU. Further, a water level signal from the water level detection means 2 in the water receiving tank is taken into the CPU via the input terminal TB2 and the input / output circuit unit I / O2, and stored in the storage unit M.

  FIG. 5 is a circuit diagram of the control device 12 when two pumps driven by the variable speed motor according to the embodiment of the present invention are operated in a row. Since the same reference numerals as those in FIG. 4 are the same, description thereof is omitted. In FIG. 5, ELB1 and ELB2 have the same function as the above-described earth leakage breaker ELB, and are earth leakage breakers for the motors 6-1 and 6-2, respectively. INV1 and INV2 are inverters that drive the motors 6-1 and 6-2 at variable speeds, respectively, and include consoles CONS1 and CONS2 each having a display unit and a setting unit.

  The inverter INV1 of the drive system of the variable speed motor 6-1 starts operation when the motor switch 52P1 is excited by a command from the control unit CU, the contact 52P1a is closed, and the frequency command signal f10 is output. At this time, the arrival signal f20 is returned to the control unit CU. The arrival signal f20 may be omitted and shared with the command signal f10. The operation of the inverter INV2 in the drive system of the variable speed motor 6-2 is also the same as that of the variable speed drive system of the variable speed motor 6-1, so that the description thereof is omitted.

  Next, FIG. 6, FIG. 7, FIG. 8 of the time chart, FIG. 9 of the cycle time description, FIG. 10, FIG. 11, and FIG. FIG. 13 and the memory map will be described in detail with reference to FIG. CPU processing is executed by a program (stored in a memory). A flowchart showing the contents of processing execution of this program is a flowchart.

  Before explaining the details of the embodiment, for the convenience of explanation, first, the start frequency of the pump will be explained. That is, if the pump motor is started frequently, the wear is quick and the life is shortened. Therefore, the pump start frequency is set to about 12 times per hour in consideration of the lifetime and the like. Therefore, in the embodiment, the description will be made assuming that this is 12 times. Here, the sum of the pump operation time and the stop time is defined as the cycle time. If the starting frequency is 12 times, this cycle time (design value) is 5 minutes (60 minutes / 12 times) in the case of operating one pump. When two pumps are operated alternately, this cycle time is 2.5 minutes (5 minutes / 2 units). When three pumps are operated alternately or rotary, this cycle time is 1.7 minutes (5 minutes / 3 units). In the case of four or more pumps, the description is omitted because it is already obvious. Details of the set cycle time are as shown in FIG.

  In general, in order to reduce the size of a small water supply device, the pressure tack provided is set to a minimum capacity of about 10 L. For this reason, the above cycle time cannot be ensured only by the operation method of starting at the above-described start pressure and stopping at the stop pressure or stop flow rate. That is, the cycle time may be shortened and the starting frequency may increase. Therefore, in order not to increase the start frequency, it is conceivable that the pump is continuously forcibly operated based on the forcible operation time variably set in the timer even if the pump stop condition is satisfied. However, in this case, since the forced operation is always performed, the operation becomes useless and power is wasted.

  In order to eliminate this, in the embodiment of the present invention, the total of the actual operation time, which is the time until the stop condition is satisfied, is operated according to the start condition, the forced operation time by the timer, and the pump stop time is the cycle time. Control to be This embodiment will be described below.

  FIG. 6 of the time chart explains the first embodiment. That is, in the first embodiment, in the previous operation cycle, the remaining time Δt (the time that was operated in excess of the cycle time) when the operation that started after the stop time exceeded the cycle time t0 is calculated as the current cycle forcing. The operation time is taken into consideration when making a decision.

  In FIG. 6, t0 is the cycle time, t10 is the forced operation time of Unit 1, t12 is the stop time of Unit 1, Δt and Δt ′ are the remaining operation time, t10 ′ is the actual operation time of Unit 1, and t20 is the second unit. The forced operation time, t22 is the stop time of the second unit, and t20 ′ is the actual operation time of the second unit.

  The pressure detection means 11 detects the pressure head of the water supply pipe 9, and the detected pressure head is stored in the storage unit M as described above. The storage unit M stores parameters such as a start pressure head PON and a stop pressure head POFF in advance. Both are compared by the CPU described above. For example, it is assumed that the pressure head detected by the pressure detection means 11 at time (1) is equal to or lower than the starting pressure head PON. As a result, at time (1), the No. 1 pump (here, No. 1 uses the preceding pump as an example) is started. That is, the control unit CU outputs an ON signal to the pump motor switch 52P1 or 52P2 or both through the output circuit unit I / O1 and the output terminal TB1.

  In the case of a pump driven by a variable speed motor, the CPU simultaneously outputs a speed command signal f10 or f30 to the inverters INV1 and INV2 via the output terminal TB3. In the following, since the constant frequency pump and the variable speed pump have the same suppression of the start frequency and elimination of the waste operation, the description of the output to the inverter and the like will be omitted, and only the common contents will be described.

  The calculation unit CPU in the control unit CU has a method of obtaining the forced operation time t10 from the cycle time t0 to the stop time t12 after the start of operation of the first unit at time (1) of the first cycle time in FIG. It is obtained by subtracting both the remaining operating time Δt of Unit 1 in the previous cycle. Δt is the remaining time of the previous cycle, but since Δt is 0 at the first time, t10 = t0−t12. Therefore, the forced operation time t10 after the stop time t12 is t0-t12. The forcible operation time t10 indicates a time for starting operation at time (1) and stopping operation at time (2). However, FIG. 6 shows a state where the amount of water used is large at time (2) and the pressure detection means 11 does not detect the stop pressure POFF. In other words, the time counting of the forced operation time t10 is completed at time (2), but the operation is continued. At time (3), the amount of water used is small and the pressure detection means 11 has detected the stop pressure POFF. For this reason, the No. 1 pump stops at time (3), and is operating for an extra time Δt with respect to the cycle time t0 until this stop.

  At time (3), the No. 2 pump starts operation when the start conditions are satisfied as in the case of No. 1 described above. Then, as described above, the forced operation time t20 is obtained by subtraction of t20 = t0− (t22 + Δt). In this example, since the operation at time (3) is the first operation for Unit 2, assuming that Δt is 0 and the stop time t22 is t22> = t0, the value of the subtraction result is “negative”. T20 (forced operation time) is set to zero. Therefore, when the stop condition is satisfied at time (4), the operation is stopped as it is.

  At time (5), Unit 1 resumes operation when the start condition is satisfied. Then, the CPU in the control unit CU obtains the forced operation time t10 = t0− (t12 + Δt) by subtraction. Here, Δt is the remaining time of the previous cycle. Since the subtraction result is a “positive” value, the subtraction result is defined as a forced operation time (t10). In the process of time (5) to (6), there is a timing to finish counting the forced operation time t10 in the middle, but the stop condition is not satisfied and the operation is continued, and the stop condition is satisfied at time (6), It is assumed that the pump stops. Here, Δt ′ (having a length different from Δt) shown last after t10 is the remaining operation time generated in this cycle.

  In addition, after restarting the operation of Unit 1 at time (5), Δt is added to the operation time, but this is obtained by adding the extra time Δt that was excessively operated in the previous cycle to the forced operation time t10 of the current cycle. (T10 = t0− (t12 + Δt)).

  Thus, in order to suppress the pump start frequency and reduce unnecessary operation, the CPU obtains the forced operation time by subtracting the remaining time of the previous operation and the previous stop time from the cycle time, Processing is performed so that the operation is continued until the timing is finished and the stop condition is satisfied. That is, the forced operation time t10 or t20 is obtained by subtracting the remaining time Δt of the previous operation from the cycle time t0 and the immediately preceding stop time t12 or t22, and the operation is performed for t10 or t20 even if the stop pressure POFF is detected. Accordingly, useless operation time is reduced.

  FIG. 7 of the time chart explains the second embodiment. In the example of FIG. 6, only a specific pump, that is, the second machine that has been followed does not perform a wasteful operation and the operation time is short, and the operation load of the first and second machines is prevented from being equalized. Therefore, the second embodiment is intended to improve this. That is, the immediately preceding stop pump stop time is not measured from the stop time of the own machine (described in the first embodiment), but is the time from the stop of the other machine to the start of the own machine. At time (4), the start condition is satisfied and the No. 2 pump is started.

  Here, the stop time t22 of the second machine is the time from the stop (time (3)) of the No. 1 pump, which is the other machine, to the start of the own machine (second machine), and from this cycle time t0 (stop time t22) ) And the remaining time Δt of the previous cycle of Unit 1 is subtracted to obtain the forced operation time t20. At time (5), the forced operation time t20 has been counted, but the stop condition is not satisfied and the operation is continued. When the stop condition is satisfied at time (6), the pump stops. Accordingly, the second unit is operating exceeding the remaining time Δt ′ after the end of the forced operation time t20.

  In this embodiment, the operation load of Unit 1 and Unit 2 is almost uniform, although it is inferior to FIG.

  FIG. 8 of the time chart explains the third embodiment. In the present embodiment, similarly to the second embodiment, the immediately preceding stop pump stop time is not measured from the stop time of the own machine, but is the time from the stop of the other machine to the start of the own machine.

  In FIG. 8, at the first cycle time, Unit 1 stops after the operation of the surplus time Δt after the lapse of the forced operation time t10, and at the next second cycle time, Unit 2 operates at the surplus time Δt ′ after the forcible operation time t20. Have stopped after. Similarly, at the 3rd cycle time and the 4th cycle time, the 1st machine and the 2nd machine are stopped after the extra operation after the forced operation time t10 or t20, respectively.

  The first machine is operated in the next fifth cycle time, and the forced operation time t10 during the operation is set to 0 (zero). That is, since the first unit is operated for two consecutive cycles in the first and third cycle times and exceeds the cycle time, the calculation unit in the control unit CU in the next cycle (fifth cycle time) of the first unit The CPU calculates the forced operation time t10 as 0 and outputs it. This is the same for Unit 2, and since it is operated over the cycle time for 2 cycles in the 2nd and 4th cycle time, control is performed in the next cycle (6th cycle time) of Unit 2. The operation unit CPU in the unit CU calculates the forced operation time t20 as 0 and outputs it.

  Also, the forced operation time t10 or t20 is calculated as 0. When the operation is performed for two consecutive cycles exceeding the cycle time, the forced operation time is calculated as 0 each time the operation is exceeded.

  According to the third embodiment, the wasteful operation is eliminated by not continuing the operation cycle due to the extra time. In addition, although it is inferior to FIG. 6 in the point of elimination of a useless operation, it has improved rather than FIG. Moreover, the start frequency can be managed to a predetermined value by preventing the operation cycle due to the extra time from continuing. In the present embodiment, the continuous cycle is two cycles, but is not limited thereto.

  FIG. 9 will be described. The operation mode of FIG. 9 is set by the setting unit 17, and the contents are stored in the memory M. In the figure, when there is one pump, the operation mode (can be selected by the control unit CU, but there is no room for selection because it is one) is a single automatic operation by this pump, and the start frequency is Assuming 12 times / hour, the cycle time satisfying this is 5 minutes (60/12). When there are two pumps, the operation mode can be selected from single operation, alternate operation, and parallel operation. Since the single operation is the same as described above, the description is omitted. Since the alternate operation and the parallel operation are alternately switched between the two pumps, the cycle time is 2.5 minutes (60 / (12 × 2)). When there are three or more pumps, the description is omitted because it is clear from the drawing.

  FIG. 10 of the flowchart is a flowchart for explaining the operation of the two constant speed pumps, and the device configuration corresponds to the above-described FIG. 1, FIG. 2, and FIG. In step 110, initial setting is performed. In particular, t10 (Unit 1 forced operation time), t11 (Unit 1 actual operation time, t10 'data in the time chart is entered), t20 (Unit 2 forced operation time), t21 (the actual operation time of Unit 2 and the data of t20 'in the time chart is entered) is reset, and Δt1 (the remaining time of the previous operation time of Unit 1 and the time chart is all represented by Δt. The first machine and the second machine are separated and subscripts 1 and 2 are added), Δt2 is set to 0, and flags t12 (1 stop time) and t22 (2 stop time) are set. The cycle time t0 is set according to the number of pumps and the operation mode shown in FIG. In this embodiment, two pumps are alternately operated, and t0 = 2.5 minutes.

  When the interrupt is permitted in step 112, the interrupt processes (A) and (B) shown in FIG. 12 are executed in order. Only the main points will be described here. That is, in the process (A) of FIG. 12, every time a key switch (for example, for parameter setting) of the operation unit 17 of the console (display and operation unit) OP shown in FIGS. The processing proceeds in this order, and each parameter shown in FIG. 14 is set. In step 156, the same cycle time t0 as that described in the initial setting is set, and in step 157 and 158, it is stored in the storage unit M. In this way, parameter settings can be changed as needed. In step 160, processing for returning to the processing part before interruption from the interruption processing is executed.

  Similarly, in the process (B), in step 163, the timer timing process of t11, t12, t21, t22, t10 ', t20' is executed. As will be described later in detail, the timer process is started by setting (enabling) the timer clock flag in the main process (for example, FIGS. 10 and 12). In step 164, data and signals such as a pressure sensor, a flow switch, and an inverter frequency are detected and stored in (names) AN0, AN1, FLSW1, and FLSW2 of the storage unit M (details are based on the memory map FIG. 14). In step 165, processing for returning to the processing part before interruption from the interruption processing is executed.

  These interrupt processes (A) and (B) are periodically executed, for example, every 100 ms. Returning to step 113 of the main process, t0 is read from the storage unit M here.

  In step 114, it is determined whether or not the start condition for the preceding machine pump is satisfied until it becomes true. When the start condition is satisfied, the process proceeds to the next 115 step, and it is determined whether the next engine is the first machine or the second machine. If the next machine is No. 1, the process proceeds to 116 steps and thereafter. In the case of Unit 2, since it is clear from the description of Unit 1, illustration and description are omitted.

  In step 116, the starting process of the first unit is executed. In step 117, a timer t10 '(measurement of the operating time of the first car) flag is set and the time measuring process is started. The result is also stored at t11. Specifically, the process of step 163 in FIG. 12B described above is performed. In step 118, the timer t <b> 12 (measurement of the stop time immediately before the first car) expires and is stored in the storage unit M. The timer t12 starts counting at the above-described step 110, that is, when the power is turned on (power is turned on). The stop time is started when the power is turned on for the first time, and after the pump is stopped except for the first time (see step 125).

  After the above pre-processing, in step 119 to 121, calculation and setting processing of the pump forced operation time for suppressing start frequency suppression and wasteful operation are executed. That is, in step 119, the cycle time t0 (here, set to 2.5 minutes) is compared with the immediately preceding stop time t12 + Δt1 (the remaining operation time of the previous cycle). The remaining time Δt1 is initially set to 0 for the first time, and is calculated and set in 125 steps from the next time, as will be described later. As a result, if t10 <= t12 + Δt1, 0 is set to the forced operation time t10 in 120 steps. If t10> t12 + Δt1, the calculation process of t10 = t0− (t12 + Δt1) is executed in 121 steps. Specifically, the stop time t12 immediately before the cycle time t0 and the operation time remaining time Δt1 of the previous cycle are subtracted, and this is set as the forced operation time. In step 119, a direct calculation of t0− (t12 + Δt1) is executed. If a negative flag is set, t10 is set to 0 in 120 steps, otherwise, the result calculated in 121 steps is stored in t10. It is good also as processing.

  After these processes, it is determined in step 122 whether the amount of water used is small and the stop condition is satisfied. That is, it is determined whether the flow rate switch FLSW1 is on (for example, on at 10 L / min or less and off at 15 L / min or more). If the result of determination is NO, the process proceeds to follower operation processing. If YES, in the next 123 steps, the sum of the forced operation time t10 + the remaining time Δt1 is compared with the actual operation time t10 ′ (= t11). As a result of the comparison, if t10 '<t10 + Δt1, the process proceeds to the follower operation process. When t10 ′ => t10 + Δt1, stop processing is executed in the next 124 steps.

  Thereafter, the process proceeds to step 125, where an operation process of the remaining operation time Δt1 (= t10 ′ − (t10 + Δt1)) is executed and stored in the storage unit M in preparation for the next process. The meaning of this equation is that the remaining operation time Δt1 of the next cycle is obtained by subtracting the previous forced operation time t10 and the previous operation remaining time Δt1 from the previous operation time t10 ′, and replacing this value with this value. is there. Thereafter, the time value of timer t10 ′ (actual operation time) t11 and its flag are reset, the time value of timer t12 (previous stop time) is reset, this flag is set, and the time measurement of stop time is started. .

  In step 126, an alternate switching process (a process of replacing the next engine with a pause pump, in this case, switching from No. 1 to No. 2) is performed, and the process returns to step 114 and continues. Although the illustration of the follower operation process described above is omitted, the parallel operation introduction process (from one unit operation to two unit parallel operation) and the parallel release process (from two unit operation to one unit operation) described in FIG. ) If the parallel introduction condition is not satisfied, the process returns to step 122, and one unit operation is continued until the stop condition is satisfied. Furthermore, although the stop condition is a flow switch in step 122, a method of detecting whether or not the stop water pressure POFF shown in FIG.

  FIG. 11 of the flowchart is a diagram for explaining the operation of two variable speed pumps, and the device configuration corresponds to the above-described FIG. 1, FIG. 3, and FIG. In this figure, steps 110 to 121 in FIG. The processes in steps 130 to 133, 140, and 141 are the estimated terminal pressure constant control processes described in FIG.

In step 130, the target pressure H0 (here, H0 is used for convenience of explanation. For example, the resistance F shown in FIG. 3 is obtained from the above-described three coordinates (PA, f3) (PB, f0 and PB, f4) (PC, f0). The target is an arithmetic expression approximated by a straight line, and the target value is obtained by substituting the current frequency into this arithmetic expression.This target value is H0, the initial value is PA, and is preset by the initial setting). The data H is read, and the data H detected by the pressure sensor in step 131 (here, H for convenience of explanation, but stored as AN0 in the storage unit) is read, and the two are compared in step 132. As a result of the comparison, the following processing is performed.
If H0 + α <H, decelerate in 133 steps.
If H0- [alpha] <= H <= H0 + [alpha], the target pressure is updated in 140 steps (the current frequency is substituted into the arithmetic expression as described above).
If H0-α> H, the acceleration process is performed in 141 steps.
Here, α is dead time and is usually 1 to 2 m.

  After executing the deceleration process, it is determined in step 134 whether the inverter frequency is equal to or lower than the minimum frequency fmin. If YES, it is determined whether the stop condition is satisfied in 135 and 136 steps, and if the stop condition is satisfied, stop processing is executed in 137 steps. These processes are the same as those in steps 122 to 124 in FIG.

  The above description is about the whole embodiment and 1-3 of the embodiment. Example 4 will be described. In this case, the cycle time is automatically obtained based on the input number of pumps (units) and pump start frequency (times / h). Specifically, the process shown in FIG. 13 may be executed in the initial setting of 110 steps of the main process and in 155 steps of the interrupt process. Here, the number of pumps n1, the start frequency n2, and the operation mode MODE are stored in the storage unit M in advance. The operable number n3 is a variable.

  In steps 170, 171, and 172, the number of pumps n1, the start frequency n2, and the operation mode MODE are read from the storage unit M, respectively. For convenience of explanation, in accordance with the above-described example, the number of pumps n1 is 2, the start frequency n2 is 12 times / hour, and the operation mode MODE is alternately B (see FIG. 9). In step 173, it is determined whether n1 is 1. Since n1 is 2, the process proceeds to steps 177 and 178. In step 178, it is determined whether MODE is A (single). Since MODE is B, proceed to steps 180 and 181. In step 181, 2 is set to the operable number n3 (the number of operable units is 2). Thereafter, the process proceeds to step 175, where the cycle time t0 is calculated by calculating t0 = 60 / (n2Xn3). The result is 2.5 minutes (60 / (12 × 2)).

Example 2 will be described. The stop time immediately before the pump operation is the time from the stop of the other machine to the operation of the self machine. This is not shown in the main process, but the timer t22 that counts the stop time is started from the time when the pump stops operation in the process of the second machine (the process corresponding to the first machine 125 step), What is necessary is just to perform the expiration process of t22 by the process of 118 steps. Although the process of the second machine is omitted, in this case, the process opposite to that of the first machine may be executed.
Example 3 will be described. This is provided with timer setting means for setting the forced operation time to 0 each time the pump operation time exceeds the cycle time for two consecutive cycles. This is because, in addition to the processing of the second embodiment, a processing for comparing the pump operation time t10 ′ with the cycle time t0 is added before the processing of 119 steps of the main processing, and if t10 ′> = t0, 2 If the determination is YES, the process proceeds to step 120; otherwise, the process proceeds to step 121.

  DESCRIPTION OF SYMBOLS 1 ... Water receiving tank, 2 ... Water level detection means, 3-1, 3-2 ... Suction pipe, 4-1 to 4-4 ... Gate valve, 5-1, 5-2 ... Pump, 6-1, 6-2 ... Motor, 7-1, 7-2 ... Flow rate switch, 8-1, 8-2 ... Check valve, 9 ... Water supply pipe, 10 ... Pressure tank, 11 ... Pressure sensor, 12 ... Control device, 17 ... Cycle time Setting unit, CU ... control unit, CPU ... calculation unit, CPU, M ... timer setting unit, t0 ... cycle time, t10, t20 ... forced operation time, t10 ', t20' ... actual operation time, t12, t22 ... stop Time, Δt: extra time.

Claims (10)

Even if the pump stop condition is satisfied, based on the forced operation time that is variably set in the timer, the water supply device that continues to forcibly operate the pump,
A cycle time setting unit for setting the cycle time of the pump operation;
A calculation unit that subtracts the stop time immediately before the pump operation from the set cycle time and the extra time when the operation time immediately before the pump operation exceeds the cycle time;
When the value of the subtraction result in the arithmetic unit is negative, timer setting means is provided which sets 0 as the forced operation time when the value of the subtraction result is positive, and sets the value as the forced operation time when the value of the subtraction result is positive. A water supply device. In the water supply apparatus of Claim 1,
The cycle time setting unit sets the cycle time based on the input number of pumps (units) and pump start frequency (times / h). In the water supply apparatus of Claim 1 or 2,
A water supply apparatus characterized in that the stop time immediately before the pump operation is the time from the stop of the self-machine to the operation of the self-machine. In the water supply apparatus of Claim 1 or 2,
A water supply apparatus characterized in that the stop time immediately before the pump operation is the time from the stop of the other machine to the operation of the self machine. In the water supply apparatus in any one of Claims 1-4,
A water supply device comprising a timer setting means for setting a forced operation time to 0 each time the operation time of the pump exceeds the cycle time continuously for a predetermined number of cycles. The water supply apparatus according to claim 5,
A water supply device comprising timer setting means for setting the forced operation time to 0 whenever the operation time of the pump exceeds the cycle time for two consecutive cycles. Even if the pump stop condition is satisfied, based on the forced operation time that is variably set in the timer, the operation method of the water supply device that continues to forcibly operate the pump,
Set the cycle time of the pump operation, subtract the stop time just before the pump operation and the extra time when the operation time just before the pump operation exceeds the cycle time from the set cycle time, and the value of this subtraction result will be An operation method for a water supply apparatus, wherein when 0 is negative, the forced operation time is 0, and when the result of subtraction is positive, the pump is forcibly operated using the value as the forced operation time. In the operating method of the water supply apparatus of Claim 7,
An operation method of a water supply apparatus, characterized in that the stop time immediately before the pump operation is the time from the stop of the self machine to the operation of the self machine. In the operating method of the water supply apparatus of Claim 7,
An operation method of a water supply apparatus, characterized in that the stop time immediately before the pump operation is set as the time from the stop of another machine to the operation of the self machine. In the operating method of the water supply apparatus in any one of Claims 7-9,
When the operation time of the pump exceeds a predetermined number of cycles continuously, the forced operation time is set to 0 each time the operation time is exceeded.

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