JP2020037817A - Water pumping device - Google Patents

Abstract

To provide a water pumping device that accurately obtains the amount of groundwater that can be pumped in a water pumping well and that pumps groundwater on the basis of the obtained amount of water that can be pumped, even at low cost.SOLUTION: A water pumping device 10 comprises a water pump 20, a water level measuring device 30, a water pumping amount measuring device 40, and a control device 50. The control device 50 comprises a first calculation unit 51 for calculating an appropriate water level decrease Hd1 in a predetermined first period, a second calculation unit 52 that calculates an inflow amount q3 flowing in a predetermined first period, a first water pumping amount setting unit 53 that sets a first pumping amount Qmax that can be pumped in a predetermined second period, and a pump operation control unit 56 that controls the operation of the water pump 20 such that a water pumping amount Q does not exceed the first water pumping amount Qmax in a predetermined second period.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water pump.

  Conventionally, when pumping groundwater from a well, the amount of pumped water is often determined mainly by the convenience (request) of the user who uses the groundwater. However, the amount of groundwater flowing into the well is finite, and if the groundwater continues to be pumped beyond the flow, the well may eventually die. Therefore, there is a technique (e.g., Patent Literature 1) for obtaining a pumpable amount for preventing the well from withering, and for pumping water according to the calculated pumpable amount. In Patent Literature 1, a plurality of observation wells are provided around a pumping well for pumping. Then, a multiple regression equation is obtained using the rainfall, the water level of the pumping well, the water level at the observation well, the leakage amount around the pumping well, and the like as variables, and the available pumping amount at the pumping well is obtained.

JP 2006-249564 A

  However, in the technique disclosed in Patent Document 1, it is necessary to provide a plurality of observation wells around the pumping well and facilities for observing rainfall in the surrounding area in order to obtain variables for obtaining the multiple regression equation as described above. Yes, a large-scale observation device is required and the cost increases.

  The present invention has been made in view of the above-described problems, and provides a pumping apparatus that accurately calculates the amount of groundwater that can be pumped in a pumping well and that pumps groundwater based on the calculated amount of pumpable water, at a low cost. The purpose is to:

  A pumping device according to the present invention includes a pump for pumping water from a well, a water level measuring device for measuring a water level drop amount in the well, and a pumping amount for measuring the water pumping amount of the water pumped by the pump. It has a measuring device and a control device for controlling the operation of the pump. The control device, in a predetermined first period, a first calculating unit that calculates an appropriate water level drop amount corresponding to the pumped amount of the pumped water based on a predetermined reference formula, and in the predetermined first period, Based on the difference between the actual water level drop measured by the water level measuring device and the appropriate water level drop calculated by the first calculator, the water corresponding to the difference flowing into the well during the first predetermined period. A second calculation unit that calculates the inflow amount of the well, based on the inflow amount of the water corresponding to the difference calculated by the second calculation unit, based on the well in a predetermined second period after the predetermined first period A first pumping amount setting unit that sets a first pumping amount that can be pumped from the first pumping unit, and controls the operation of the water pump so that the pumping amount of the water does not exceed the first pumping amount in the predetermined second period. Pump operation control Provided with a door.

  As described above, the first pumping amount setting unit is configured to perform the predetermined pumping operation based on the water inflow amount corresponding to the difference calculated based on the difference between the actual water level lowering amount and the appropriate water level lowering amount in the predetermined first period. Set the first pumping amount, which is the maximum pumping amount in two periods. Then, in the predetermined second period, the pump operation control unit controls the operation of the water pump so as not to exceed the set first water pumping amount. Therefore, as long as the amount of water flowing into the well during the predetermined second period does not significantly change with respect to the amount of water flowing into the well during the predetermined first period, the amount of water flowing into the well during the predetermined second period is changed. There is no danger of pumping too much water (overpumping). In this way, despite a very simple and low-cost configuration, the amount of water flowing into the well in the predetermined first period before the predetermined second period is actually measured, and a predetermined amount is determined based on the actually measured inflow amount. Since the pumping amount in the second period is set, the water level in the well can be accurately controlled near the appropriate water level.

It is an outline figure of a pumping device and a well concerning an embodiment. It is a pumping amount-water level fall amount graph. It is a graph explaining the inflow amount of the water which flows into a well. It is a flowchart explaining operation | movement of a water pumping apparatus. It is a schematic diagram of a pumping device according to a second embodiment. It is a schematic diagram of a pumping device according to Modification 1 of the second embodiment.

<1. First embodiment>
(1-1. Overview)
First, a pumping well 100 provided with the pumping device 10 according to the first embodiment of the present invention (hereinafter simply referred to as the well 100) will be briefly described. FIG. 1 schematically illustrates a pumping well 100 and a cross section of the ground where the pumping well 100 is excavated. The well 100 is a normal well drilled for pumping well water W (groundwater) (hereinafter referred to as pumping). The well 100 is formed by drilling a hole 101 having a diameter 2R to a depth L. The depth L refers to the depth from the ground surface 102 where the hole 101 is excavated to the bottom surface 103 of the well 100.

  The lower part of the well 100 invades the aquifer 104 in the ground. As a result, in the well 100, groundwater from the aquifer 104 flowing at a relatively low speed penetrates the inner peripheral surface of the well 100 and leaks and is retained as well water W. For this reason, the water level of the water surface Ws of the well water W fluctuates daily, though slightly. In addition, the water level of the water surface Ws may fluctuate significantly when viewed from season to season. As described above, since the water level of the water surface Ws of the well water W fluctuates, each time the pumping of the well water W is started, the water level of the water surface at the time of starting pumping is set as the reference water level H0. The reference water level H0 will be used in the following description.

(1-2. Pumping device)
Pumping device 10 is arranged in well 100 as shown in FIG. The water pumping device 10 includes a water pump 20, a water level measuring device 30, a water pumping amount measuring device 40, and a control device 50. The pump 20 is a submersible pump that is disposed near the bottom surface 103 of the well 100 and pumps the well water W. Most of the water pump 20 need not always be immersed in the well water W as long as at least the suction port 20a is always immersed in the well water W.

  In the above description, the water pump 20 may be any type of pump. For example, a known submersible cascade pump, submersible volute pump, submersible turbine pump, submersible mixed flow pump, or the like may be used. The pump 20 is electrically connected to a power supply and a control device 50 (not shown). One end of a pipe 21 formed of a metal such as iron is connected to a discharge port (not shown) of the water pump 20. The pipe 21 extends upward in the direction of gravity from the discharge port of the water pump 20 and is bent at a right angle around the upper end of the well 100. The shape of the pipe 21 may be any shape as long as the external pipe 22 described below is connected and discharge is possible.

  The other end of the pipe 21 is connected to one end of the above-described external pipe 22 formed of metal, rubber, vinyl, or the like. The other end of the external pipe 22 is arranged so that the well water pumped by the pump 20 can be discharged into the container 60. The container 60 may be any container as long as it is container-shaped. For example, the container 60 may be a tank, a fish pond, a pool, or the like. Further, the container 60 may be a paddy field, a pond, or the like. Further, the container 60 is not limited to the container-shaped one as in the above-described embodiment, and may be a flowing river or water. That is, the container 60 may have any form as long as the water pumped by the water pump 20 can be discharged from the other end of the external pipe 22 based on the use desired by the user.

  The water level measurement device 30 (water level sensor) measures the water level of the well water W (water) in the well 100, and thus the water level drop Hd. As described above, the water level drop amount Hd is a change amount (drop amount) from the reference water level H0 when the water level of the water surface at the time of starting the pumping of the well water W is set to the reference water level H0. In the present embodiment, the water level measuring device 30 is a well-known submersible water level sensor that measures the water level based on the water pressure.

  However, the water level measurement device 30 is not limited to this mode, and any type of water level sensor may be applied. For example, the water level measuring device 30 may be a known water level sensor of a float type, a displacer type, a guide pulse type, an optical type, a laser type, or the like. The water level measuring device 30 is electrically connected to a power supply and a control device 50 (not shown).

  The pumping amount measuring device 40 is a device that actually measures the pumping amount Q of the well water pumped (pumped) by the pumping pump 20. As shown in FIG. 1, the pumping amount measurement device 40 is a liquid flow meter arranged at the other end of the pipe 21. Specifically, the pumping amount measuring device 40 is configured by, for example, a known electromagnetic flow meter, an ultrasonic flow meter, or the like. However, the present invention is not limited to the above-described embodiment, and any type of flow meter may be used as the pumping amount measuring device 40 as long as the pumping amount Q can be measured. The pump 20 is electrically connected to a power supply and a control device 50 (not shown). The pumping amount measuring device 40 has an object to measure the pumping amount Q of the pumping pump 20. For this reason, if the amount of pumped water per unit time of the pump 20 is known, a time counter that counts the operating time of the pump 20 can be provided. To obtain the pumped water amount Q. That is, the pumping amount measuring device 40 may be configured by a time counter and a multiplier.

(1-3. Control device)
The control device 50 mainly controls the operation of the pump 20, the first calculator 51, the second calculator 52, the first pumping amount setting unit 53, the second pumping amount setting unit 54, A unit-time pumped water amount calculation unit 55, a pump operation control unit 56, and a storage unit 57 that stores various measurement data, programs, and the like are provided. There is no problem even if the control device 50 is separated from the water pump 20.

  The first calculation unit 51 shows, for example, an appropriate water level drop amount Hd1 corresponding to the pumping amount Q1 of the well water W pumped from the well 100 in one day before (corresponding to a predetermined first period) in FIG. It is calculated based on a regression equation A (corresponding to a predetermined reference equation). Here, the appropriate water level drop Hd1 refers to the maximum value of the allowable drop of the water level that does not cause the well water to wither and does not adversely affect surrounding wells when a predetermined amount of well water is pumped from the well. . The appropriate water level decrease amount Hd1 is a known concept, and therefore, a more detailed description will be omitted.

  Note that the “one day before the previous day” in the above may be set in any manner, but one day may be read as 8 hours, or may be read as 12 hours or 24 hours. Further, in the following description, “one day before the previous day” is described only as “the previous day”.

  The above-described regression equation A is a graph showing the relationship between the amount of pumped water based on the pumping test performed on a plurality of existing wells by the Tohoku Agricultural Administration, which is a public organization, and the appropriate drop in water level. That is, normally, if the relationship between the pumped water amount and the water level decrease amount corresponding to the pumped water amount is on the graph of the regression equation A, it is not “over-pumped state”, that is, the well water is excessively pumped, for example, well withering, It can be determined that there is no risk of affecting wells and land subsidence in the surroundings. The pumping test is publicly known, and therefore a detailed description is omitted.

The regression equation A is a known equation, and is approximated by a quadratic curve (y = 10 ⁻⁵ x ² + (5 × 10 ⁻³ x), (R ² = 0.9997)). However, this time, the quadratic curve equation described above is adopted as the regression equation A, but is not limited to this mode. The user may conduct a pumping test using the well 100 actually used, derive a regression equation based on the obtained pumping test results, and employ the derived regression equation as the regression equation A.

  The second calculator 52 calculates the actual water level decrease Hd2, which is the actual water level decrease measured by the water level measuring device 30 in the previous day (the predetermined first period), and the appropriate water level decrease calculated by the first calculator 51. Based on the difference from Hd1 (see FIG. 2), the inflow q of the well water that has flowed into the well 100 the day before is calculated corresponding to the difference.

  For example, it is assumed that the actual water level drop amount, which is the actual water level drop amount with respect to the pumping amount Q1 on the previous day, is Hd2 as shown in FIG. In this case, the actual water level decrease Hd2 is a value larger than the appropriate water level decrease Hd1. In other words, when the well water W is pumped at the pumping amount Q1 the day before, the water level should originally be the proper water level drop Hd1, but actually, the proper water level drop Hd1 is compared with the proper water level drop Hd1. The water level is relatively lowered by the difference (Hd1-Hd2) from the water level reduction amount Hd2.

This means that the well water W is pumped at the pumping amount Q1 and the inflow amount q1 of the well water W into the well 100 in the case where the water level becomes the appropriate water level lowering amount Hd1 (reference time). This is because the inflow amount q2 of the well water W was smaller by the predetermined inflow amount q3 (see FIG. 3). Therefore, the second calculating unit 52 determines the predetermined inflow amount q3 by the following equation (1) based on the above-mentioned difference in water level (Hd1-Hd2) and the diameter (inner diameter) 2R of the inner peripheral surface of the well 100. Calculate.
q3 = πR ² × (Hd1-Hd2) (1)
In the present embodiment, the predetermined inflow amount q3 is a negative value.

  The first pumping rate setting unit 53 calculates the well water inflow q3 corresponding to the difference (Hd1-Hd2) of the water level on the previous day calculated by the second calculating unit 52, for one day (the predetermined second During the period, the first pumping amount Qmax that can be pumped (pumped) from the well 100 is set. Specifically, the first pumping amount Qmax is obtained by adding the inflow amount q3 to the pumping amount Q1 pumped the day before. However, in the present embodiment, the inflow amount q3 is a negative value as described above. Therefore, the first pumping amount Qmax is a value obtained by subtracting the absolute value | q3 | of the inflow amount q3 from the pumping amount Q1 (Qmax = Q1− | q3 |) (see FIG. 2).

  The “one day of the next day” in the above may be set in any manner similar to the “one day of the previous day”, but one day may be read as 8 hours, or 12 hours or 24 hours. You may read it. However, “one day before” and “one day after” are the same length of time. In the following description, "one day of the next day" is described only as "next day".

  The second pumping amount setting unit 54 sets the second pumping amount Qs to be pumped from the well 100 based on the required water amount Qn (≦ Qmax) required by the user on the next day, which is equal to or less than the first pumping amount Qmax. At this time, the required water amount Qn required by the user is, for example, the amount of water (flow rate) to be supplied to the paddy field and the amount of water (flow rate) to be supplied to the pool in the next day. And in this embodiment, the second pumping amount Qs is equal to the required water amount Qn (Qs = Qn). However, it is not limited to this mode. The second pumping amount Qs may be set at, for example, 80% of the required water amount Qn, or may be set at less than 80%. Further, the setting may be made at a rate exceeding 80% of the required water amount Qn.

  The unit time pumping amount calculation unit 55 calculates the pumping amount Qs1 / min per unit time on the next day (predetermined second period) for the second pumping amount Qs set by the second pumping amount setting unit 54. That is, the second pumping amount Qs is divided by the operation time (for example, 8 hours) on the next day to calculate the pumping amount Qs1 / min per unit time.

  The pump operation control unit 56 determines that the pumping amount Q of the well water W to be pumped does not exceed the first pumping amount Qmax on the next day (predetermined second period) and that the calculated next day (predetermined second period). The operation of the pump 20 is controlled so that the pumping amount Qs1 / min per unit time is kept constant.

(1-4. Operation)
Next, the operation of the water pumping device 10 controlled by the control device 50 will be briefly described based on a flowchart. It is assumed that the pumping device 10 has pumped the well water W by the pumping amount Q1 in one day (for example, 8 hours) the previous day (predetermined first period). Then, as a result of pumping by the pumping amount Q1, the water level on the water surface is assumed to have decreased by the actual water level drop Hd2 (see FIG. 2), starting from the time when pumping was started.

  After that, the storage unit 57 provided in the control device 50 stores the pumping amount Q1 measured by the pumping amount measuring device 40 and the actual water level drop amount Hd2 measured by the water level measuring device 30 as a pair of corresponding data. Therefore, the process in which the pumping amount Q1 and the actual water level drop amount Hd2 are stored in the storage unit 57 is defined as step S10. Step S10 is processing executed on the previous day (a predetermined first period).

In step S <b> 12 performed on the next day, the first calculation unit 51 acquires the pumping amount Q <b> 1 stored in the storage unit 57. Then, in step S14, the first calculator 51 substitutes the pumping amount Q1 into the above-described regression equation A (predetermined reference formula) to calculate the “appropriate water level drop Hd1” corresponding to the pumping amount Q1. The appropriate water level decrease Hd1 and the regression equation A are as described above. As described above, the regression equation A is an equation approximated by a quadratic curve (y = 10 ⁻⁵ x ² + (5 × 10 ⁻³ x), (R ² = 0.9997)).

  In step S16, the second calculating unit 52 responds to the difference based on the difference (Hd1-Hd2) between the appropriate water level drop amount Hd1 calculated by the first calculating unit 51 and the actual water level drop amount Hd2 acquired from the storage unit 57. Then, the inflow q3 of the well water that has flowed into the well 100 the day before is calculated by the above equation (1).

  In step S18, the first pumping amount setting unit 53 pumps (pumps) the well 100 from the well 100 in the next day (predetermined second period) based on the inflow amount q3 of the well water calculated by the second calculating unit 52. A possible first pumping amount Qmax is set. Specifically, the first pumping amount Qmax is a value obtained by subtracting the absolute value | q3 | of the inflow amount q3 from the pumping amount Q1 (Qmax = Q1− | q3 |) (see FIG. 2).

  That is, on the previous day, the actual water level drop Hd2 is larger than the appropriate water level drop Hd1 by the difference (Hd1−Hd2) because the excess water is pumped up by the inflow rate q3. Then, on the next day, the water level is set to the water level (Q1- | q3 |) smaller than the water level Q1 of the previous day by the inflow amount q3 corresponding to the difference (Hd1-Hd2) of the water level drop amount from the water level Q1 of the previous day. The reduction amount Hd can be set to a value near the appropriate water level reduction amount Hd1.

  In step S20, the second pumping amount setting unit 54 sets the second pumping amount Qs. The second pumping amount Qs is a pumping amount set to be equal to or less than the first pumping amount Qmax and set based on a required water amount Qn (≦ Qmax) required by the user on the next day. As the second pumping amount Qs, data stored in the storage unit 57 in advance may be used, or a user may input and set an arbitrary value.

  In step S22, the unit time pumping amount calculation unit 55 calculates the pumping amount Qs1 / min per unit time on the next day (a predetermined second period) for the second pumping amount Qs. The pumping rate Qs1 / min per unit time is calculated by dividing the acquired second pumping rate Qs by the operation time (for example, 8 hours) on the next day.

  In step S24, the pump operation control unit 56 determines that the pumping amount Q of the well water W to be pumped does not exceed the first pumping amount Qmax and that the pumping amount Qs1 / per unit time on the next day (predetermined second period). The operation of the water pump 20 is controlled so that min is kept constant.

  Thereby, on the next day (predetermined second period), the actual water level drop amount Hd2 corresponding to the pumping amount Q of the well water W pumped by the pumping pump 20 is located near the line on the graph of the regression equation A in FIG. I do. That is, the actual water level drop Hd2 corresponding to the pumped water quantity Q on the next day (predetermined second period) approaches the appropriate water level lowered quantity Hd1, and the danger of over-pumping is surely reduced. Further, on the next day, the operation of the pump 20 is controlled so that the pumping amount Qs1 / min per unit time is constant, so that the power consumption of the motor driving the pump 20 can be significantly reduced.

  In the above embodiment, the predetermined first period and the predetermined second period are each described as “one day”, but the present invention is not limited to this. The predetermined first period and the predetermined second period can be arbitrarily set by a user of the water pumping device 10. The predetermined first period and the predetermined second period may be, for example, 10 minutes, 30 minutes, 1 hour, 1 week, and the like, respectively. A reasonable effect can be expected from these. Further, the predetermined first period and the predetermined second period may not be the same period but may be different periods. This can be expected to have a corresponding effect.

(1-5. Effect of First Embodiment)
According to the first embodiment, the control device 50 included in the water pumping device 10 determines that the appropriate water level drop corresponding to the pumping amount Q of the well water W (water) pumped (pumped) the previous day (predetermined first period). A first calculator 51 for calculating the amount Hd1 based on the regression equation A (predetermined reference equation), an actual water level drop Hd2 measured by the water level measuring device 30 and an appropriate water level calculated by the first calculator 51 on the previous day. A second calculator 52 for calculating an inflow q3 of the well water W corresponding to the difference (Hd1-Hd2) that has flowed into the well 100 the day before, based on the difference (Hd1-Hd2) with the decrease Hd1; Based on the inflow amount q of the well water W corresponding to the difference (Hd1-Hd2) calculated by the unit 52, the first pumping amount Qmax that can be pumped (pumped) from the well 100 on the next day (predetermined second period) after the previous day. A first pumping amount setting unit 53 to be set and a pump operation control for controlling the operation of the pumping pump 20 so that the pumping amount Q of the well water (water) does not exceed the first pumping amount Qmax in the next day (predetermined second period). A part 56.

  As described above, the first pumping amount setting unit 53 calculates the difference calculated based on the difference (Hd1−Hd2) between the actual water level drop amount Hd2 and the appropriate water level drop amount Hd1 in the previous day (predetermined first period). Based on the inflow amount q3 of the well water corresponding to (Hd1-Hd2), the first pumping amount Qmax which is the maximum pumping amount in one day (a predetermined second period) of the next day is set.

  Then, on the next day, the pump operation control unit 56 controls the operation of the water pump 20 so as not to exceed the set first water pumping amount Qmax. Therefore, unless the inflow q of the well water (water) into the well on the next day fluctuates greatly with respect to the inflow q of the well water into the well on the previous day, the water in the well may be pumped too much on the next day ( The risk of overpumping is low. In this way, despite the extremely simple and low-cost configuration, the inflow of water into the well on the previous day before the next day is actually measured, and the pumping amount on the next day is set based on the actually measured inflow. The water level drop in the well can be accurately controlled to the vicinity of the appropriate water level drop Hd1, and well pumping of well water can be prevented well.

  Further, according to the first embodiment, the control device 50 pumps water from the well 100 based on the required water amount Qn required by the user on the next day (a predetermined second period), which is equal to or less than the first pumped water amount Qmax. A second pumping amount setting unit 54 for setting the second pumping amount Qs is provided. Then, the pump operation control unit 56 controls the operation of the water pump 20 so that the pumping amount Q does not exceed the second pumping amount Qs on the next day (a predetermined second period).

  Thereby, on the next day (predetermined second period), not the first pumping amount Qmax but the second pumping amount Qs set based on the required water amount Qn whose pumping amount is smaller than the first pumping amount Qmax so as not to exceed the second pumping amount Qs. The operation of the water pump 20 is controlled. As described above, since the well water is pumped so that the pumping amount does not exceed the required water amount Qn that is smaller than the first pumping amount Qmax that is the maximum pumping amount that can be pumped, excessive pumping is more reliably prevented.

  Further, according to the first embodiment, the control device 50 calculates the pumping rate Qs1 / min per unit time on the next day (predetermined second period) for the set second pumping rate Qs. A pumping amount calculator 55 is provided. Then, the pump operation control unit 56 controls the operation of the water pump 20 so that the calculated water pumping amount Qs1 / min per unit time is kept constant. As described above, on the next day, the operation of the pump 20 is controlled so that the pumping amount Qs1 / min per unit time is kept constant, so that the power consumption of the motor (not shown) for driving the pump 20 is significantly reduced. The cost can be reduced and cost can be reduced.

  Further, according to the above embodiment, the previous day (predetermined first period) and the next day (predetermined second period) are one day (for example, 8 hours, 12 hours, or 24 hours). As described above, since a relatively long time is set as the predetermined first period and the predetermined second period, the inflow amount q of water into the well 100 can be averaged. Therefore, on the next day (predetermined second period), when the water pump 20 pumps the well water W, over-pumping can be accurately prevented.

<2. Second embodiment>
In the first embodiment, the control device 50 of the pumping device 10 includes the second pumping amount setting unit 54. However, the present invention is not limited to this mode. As shown in FIG. 5, as a second embodiment, the control device 150 of the water pumping device 110 does not include the second water pumping amount setting unit 54 and the unit time pumping water amount calculating unit 55. You may. In this case, the control device 150 includes only the first pumping amount setting unit 53 as the pumping amount setting unit. Then, the pump operation control unit 56 may control the operation of the water pump 20 so that the pumping amount does not exceed the first pumping amount Qmax on the next day (a predetermined second period). This also provides a corresponding effect to the first embodiment. However, not limited to this mode, when the pump operation control unit 56 controls the operation of the water pump 20 on the next day (a predetermined second period), a predetermined ratio (for example, 80%) is added to the first pumping amount Qmax. Control may be performed so as not to exceed the multiplied value.

(2-1. Modification 1)
As a first modified example of the second embodiment, as shown in FIG. 6, the control device 150 of the water pumping device 110 controls the set first pumping water amount Qmax per unit time on the next day (predetermined second period). May be provided with a unit time pumped water amount calculation unit 155 for calculating the pumped water amount Qs2 / min. At this time, the pump operation control unit 156 controls the operation of the water pump 20 so that the calculated water pumping amount Qs2 / min per unit time is kept constant. This also provides a corresponding effect to the above embodiment.

10, 110; pumping device, 20; pumping pump, 30; water level measuring device, 40; pumping amount measuring device, 50, 150; control device, 51; first calculating section, 52; second calculating section, 53; Pumping amount setting unit, 54; Second pumping amount setting unit, 55,155; Unit time pumping amount calculation unit, 56,156; Pump operation control unit, 100; Pumping well (well), H: Water level, Hd1; Reduction amount, Hd2: Actual water level reduction amount, Q: Pumping amount, q: Inflow amount, Qmax: First pumping amount, Qn: Required water amount, Qs: Second pumping amount.

Claims (5)

A pump to pump water from the well,
A water level measurement device that measures the water level drop amount of the water in the well,
A pumping amount measuring device for measuring a pumping amount of the water pumped by the pumping pump,
A control device for controlling the operation of the water pump, comprising:
The control device includes:
In a predetermined first period, a first calculation unit that calculates an appropriate water level drop amount corresponding to the pumped amount of the pumped water based on a predetermined reference formula,
In the predetermined first period, based on the difference between the actual water level decrease amount measured by the water level measurement device and the appropriate water level decrease amount calculated by the first calculation unit, the predetermined first period into the well. A second calculation unit that calculates the inflow amount of the water corresponding to the inflow,
Based on the inflow amount of the water corresponding to the difference calculated by the second calculation unit, a first pumping amount that can be pumped from the well in a predetermined second period after the predetermined first period is set. One pumping amount setting part,
A pump operation control unit that controls the operation of the water pump so that the pumped amount does not exceed the first pumped amount in the predetermined second period. The control device includes:
A second pumping amount setting unit that sets a second pumping amount to be pumped from the well based on a required water amount required by a user during the predetermined second period, the first pumping amount or less,
The pumping device according to claim 1, wherein the pump operation control unit controls the operation of the pump in such a manner that the pumping amount does not exceed the second pumping amount in the predetermined second period. The control device includes:
For the set first pumping amount, comprises a unit time pumping amount calculation unit that calculates the pumping amount per unit time in the predetermined second period,
The pumping device according to claim 1, wherein the pump operation control unit controls the operation of the water pump so that the calculated pumping amount per unit time is constant. The control device includes:
For the set second pumping amount, comprises a unit time pumping amount calculation unit that calculates the pumping amount per unit time in the predetermined second period,
The pumping device according to claim 2, wherein the pump operation control unit controls the operation of the pump in such a manner that the calculated pumping amount per unit time is kept constant.   The pumping device according to any one of claims 1 to 4, wherein the predetermined first period and the predetermined second period are one day.

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