JP2012077701A - Pump characteristic measuring method and pump characteristic measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically measure pump characteristics without stopping operation of a water treatment plant facility.SOLUTION: A control device 10 monitors whether a pumping amount q and an average rotation speed n of suction pumps P-Pare within prescribed ranges, and then detects average water level differences h-hwhen the pumping amount q and the average rotation speed n of the suction pumps P-Pare within the prescribed ranges. The control device 10 stores the detected average water level differences h-h, and pumping amounts q-qand average rotation speeds n-nof corresponding suction pumps P-Pin association with each other, and calculates a Q-H curve and a load curve of the suction pumps P-Pby using the associated and stored average water level differences h-hand the pumping amounts q1-q5 of the suction pumps P-Pand the average rotation speeds n-nof the suction pumps P-P.

Description

  The present invention relates to a pump characteristic measuring method and a pump characteristic measuring apparatus for measuring pump characteristics of a pump for pumping sewage in a first water tank to a second water tank.

Generally, when making a decision on an operation plan of a water treatment plant facility (hereinafter abbreviated as plant facility), a simulation of the behavior of the plant facility using computer technology is performed. In performing this simulation, if the simulation model does not correctly represent the actual plant equipment, the behavior of the plant equipment obtained by the simulation does not match the behavior of the actual plant equipment, and the simulation accuracy is reduced. For this reason, the simulation model must correctly represent actual plant equipment. From such a background, when simulating the behavior of a plant facility equipped with a pump, pump characteristics such as a QH curve and an efficiency curve measured during a trial operation of the pump alone are used in the simulation model. The QH curve is a curve showing the relationship between the flow rate Q [m ³ / min] of the liquid that can be discharged by the pump and the height (lift) H [m] at which the pump can push up the liquid. Means that. In general, when the flow rate Q is large, the lift H is small, and when the flow rate Q is small, the lift H is large, so the QH curve is a downward-sloping curve. The efficiency curve means a curve indicating a relationship between the flow rate Q [m ³ / min] of the liquid that can be discharged by the pump and the efficiency η [%] of the pump.

Japanese Patent Laid-Open No. 3-145597

  By the way, when the plant equipment includes a plurality of pumps, the pump characteristics of each pump change from the pump characteristics of a single pump according to the number of pumps operated and the connection state of piping between pumps. In addition, the pump characteristics of the pump alone change from the pump characteristics measured during the trial operation due to aging. For this reason, when simulating the behavior of the plant equipment equipped with the pump using the pump characteristics measured during the trial operation of the pump alone, the behavior of the pump required by the simulation does not match the behavior of the actual pump, Simulation accuracy is reduced. In addition, in order to solve such a problem, the method of stopping the operation of plant equipment and measuring the pump characteristics of the pump can be considered. However, according to this method, much labor and time are required to stop the operation of the plant equipment. For this reason, provision of a measuring method and a measuring device capable of automatically measuring the pump characteristics of the pump without stopping the operation of the plant equipment is expected so that the behavior of the plant equipment including the pump can be accurately simulated.

  This invention was made in view of the said subject, The objective provides the pump characteristic measuring method and pump characteristic measuring apparatus which can measure a pump characteristic automatically, without stopping operation of water treatment plant equipment. There is.

  In order to solve the above-described problems and achieve the object, a pump characteristic measurement method according to the present invention is a pump characteristic measurement for measuring pump characteristics of a pump for pumping sewage in a first water tank to a second water tank. A first detection step for detecting a rotation speed and a pumping amount during steady operation of the pump, and whether or not the rotation speed and the pumping amount detected by the first detection step are within a predetermined range. A determination step that determines the rotation speed and the pumping amount when the rotation speed and the pumping amount are determined to be within a predetermined range in the determination step. A second detection step for detecting at least one of a water level difference between the sewage in the first water tank and the sewage in the second water tank and the efficiency of the pump; and the water level difference detected by the second detection step. A storage step of associating and storing at least one of the efficiency and the rotation speed corresponding to the pumping amount; at least one of the water level difference and the efficiency stored in association with each other in the storage step; And a calculation step of calculating at least one of a QH curve and an efficiency curve of the pump using the pumped water amount.

  In order to solve the above-described problems and achieve the object, a pump characteristic measurement apparatus according to the present invention measures pump characteristics of a pump that pumps sewage in a first water tank into a second water tank. A rotation number detecting means for detecting a rotation speed during steady operation of the pump; a pumping amount detection means for detecting a pumping amount during steady operation of the pump; the rotation speed detection means and the pumped amount The determining means for determining whether the rotation speed and the pumped amount detected by the detecting means are within a predetermined range, and the determination means determined that the rotation speed and the pumped water volume are within the predetermined range. In this case, at least one of the difference in water level between the sewage in the first water storage tank and the sewage in the second water storage tank and the efficiency of the pump when the rotation speed and the pumped amount are within a predetermined range. Detect to detect Means, and at least one of the water level difference and efficiency detected by the detection means and the rotation speed and the pumped amount are stored in association with each other, and the water level difference and at least one of the efficiency stored in association with each other are stored. And calculating means for calculating at least one of a QH curve and an efficiency curve of the pump using the rotation speed and the pumped amount.

  According to the pump characteristic measuring method and the pump characteristic measuring apparatus according to the present invention, the pump characteristic can be automatically measured without stopping the operation of the water treatment plant facility.

FIG. 1 is a schematic diagram showing a configuration of a water treatment plant facility to which a pump characteristic measuring apparatus according to an embodiment of the present invention is applied. FIG. 2 is a diagram for explaining a method of calculating the pumping amount of the water absorption pump. FIG. 3 is a diagram illustrating an example of a map used for calculating the QH curve. FIG. 4 is a diagram illustrating an example of a determinant used for calculating the QH curve and the load curve. FIG. 5 is a diagram for explaining how the QH curve changes over time. FIG. 6 is a diagram for explaining a change in the efficiency curve accompanying a change in the number of rotations of the water absorption pump. FIG. 7 is a diagram for explaining a change in the efficiency curve accompanying a change in the number of operating water pumps. FIG. 8 is a diagram illustrating an example of a map used for calculating the efficiency curve. FIG. 9 is a diagram illustrating an example of a determinant used for calculating the efficiency curve. FIG. 10 is a diagram for explaining how the efficiency curve changes over time.

  Hereinafter, the configuration and operation (pump characteristic measuring method) of a pump characteristic measuring apparatus according to an embodiment of the present invention will be described with reference to the drawings.

[Configuration of water treatment plant equipment]
First, with reference to FIG. 1, the structure of the water treatment plant equipment with which the pump characteristic measuring device which is one Embodiment of this invention is applied is demonstrated.

FIG. 1 is a schematic diagram showing a configuration of a water treatment plant facility to which a pump characteristic measuring apparatus according to an embodiment of the present invention is applied. As shown in FIG. 1, a water treatment plant facility 1 to which a pump characteristic measuring device according to an embodiment of the present invention is applied pumps sewage 4 flowing from a sand basin 2 into a pump well 3 to a discharge trough 5. The water level of the sewage 4 in the pump well 3 is controlled within a predetermined range by controlling the operation / stop of the _N water absorption pumps P _{1 to} P _N. The sewage 4 pumped to the discharge tank 5 by the _N water absorption pumps P _{1 to} P _N is supplied to a water treatment facility 6 including an initial settling tank, an aeration tank, a final settling tank, and the like for processing. The pump well 3 and the discharge well 5 correspond to the first and second water storage tanks according to the present invention, respectively.

Water treatment plant equipment 1, water pump _P 1 to P _N off provided for each valve _V 1 ~V _N, the rotation speed sensor _S A1 _{to S AN,} and an electric sensor _S B1 _{to S BN,} and the water level sensor L The pumping amount sensor QS and the control device 10 are provided. The on-off valves V _{1 to} V _N are provided in pipes 7 _{1 to} 7 _N through which the sewage 4 discharged from the water absorption pumps P _{1 to} P _N flows, respectively, and are controlled to be opened and closed by the control device 10, whereby the water absorption pumps P ₁ to P _N. The flow rate of the sewage 4 pumped from the _PN to the discharge rod 5 is controlled. Each speed sensor _S A1 _{to S AN,} detects the rotational speed of the water pump _P 1 to P _N, and inputs the electrical signal indicative of the rotational speed detected in the controller 10. Rotational speed sensor _S A1 _{to S AN} functions as a rotation speed detecting means of the present invention.

The electric sensors S _{B1 to} S _BN detect the operation state of the electromagnetic contactors of the water absorption pumps P _{1 to} P _N , respectively, and input an electric signal indicating the detected operation state to the control device 10. That is, the electric sensors S _{B1 to} S _BN detect the number of operating water pumps P _{1 to PN} . The electric sensors S _{B1 to} S _BN detect the power consumption of the water absorption pumps P _{1 to} P _N and input an electric signal indicating the detected power consumption to the control device 10. That is, the electrical sensors S _{B1 to} S _BN detect the efficiency of the water absorption pumps P _{1 to PN} . The water level sensor L detects the water level of the sewage 4 in the pump well 3 and inputs an electric signal indicating the detected water level to the control device 10. The electric sensors S _{B1 to} S _BN and the water level sensor L function as detection means according to the present invention. Pumping amount sensor QS detects the flow rate of the wastewater 4 being pumped to the discharge culvert 5 as pumping amount Q ₀ due to water absorption pump P ₁ to P _N, which is in operation, an electrical signal indicative of the pumping amount Q ₀ which has been detected Input to the control device 10. The pumping amount sensor QS functions as a pumping amount detection unit according to the present invention.

The control device 10 is configured by an arithmetic processing device such as a workstation or a personal computer. The control device 10 controls the water level of the sewage 4 in the pump well 3 within a predetermined range by controlling the operation and the rotational speed of the water absorption pumps P _{1 to} P _N based on the electric signals input from the sensors. . Moreover, the control apparatus 10 operates as a pump characteristic measuring apparatus according to an embodiment of the present invention, so that the pumps of the water absorption pumps P _{1 to} P _N that are in an operating state when the water treatment plant facility 1 is operating. Automatic measurement of characteristics. The control device 10 functions as a determination unit and a calculation unit according to the present invention.

[Pump characteristic measurement method]
In the water treatment plant facility 1 having such a configuration, the control device 10 operates as follows to automatically measure the QH curve and the efficiency curve of the water absorption pumps P _{1 to} P _{N in} the operating state. . Hereinafter, the operation of the control device 10 when measuring the pump characteristics of the water absorption pumps P _{1 to} P _N will be described separately for the operation when measuring the QH curve and the operation when measuring the efficiency curve.

[QH curve measurement method]
First, with reference to FIGS. 5 to describe the operation of the control device 10 when measuring the Q-H curve of the water pump P ₁ to P _N.

Generally, the Q-H curve of the water pump _P 1 to P _N, are used to determine the pumping amount _{Q 0} of the water pump _P 1 to P _N when simulating the behavior of the water treatment plant equipment 1. Specifically, when obtaining the pumping amount _{Q 0} of the water pump _P 1 to P _N are, first, the average rotational speed and the discharge flow rate q of the water pump _{P 1 ~P N n1, n1,} n3 (n1> n2 QH curves LN1 to LN3 as shown in FIG. 2 are calculated as functions having> n3) as variables. QH curves LN1 to LN3 shown in FIG. 2 are QH curves corresponding to the average rotational speeds n1 to n3, respectively. Next, the water level difference H between the sewage in the pump well 3 and the sewage in the discharge tank 5 and the average opening K1, K2, K3 (K1 <K2 <K3) of the on-off valves V _{1 to} V _N are used as variables. Load curves LK1 to LK3 as shown in FIG. 2 are calculated as functions. Load curves LK1 to LK3 shown in FIG. 2 are load curves corresponding to the average openings K1 to K3, respectively. Next, the average rotation speed n of the water absorption pumps P _{1 to} P _N is detected, and the QH curve LN corresponding to the detected average rotation speed n is calculated by interpolation processing using the QH curves LN 1 to LN 3. . Next, the average opening K of the on-off valves V _{1 to} V _N is detected, and a load curve LK corresponding to the detected average opening K is calculated by an interpolation process using the load curves LK 1 to LK 3. Then, it calculates the discharge flow rate q1 corresponding to the intersection P between the calculated Q-H curve LN and the load curve LK as pumping amount _{Q 0} of the water pump _P 1 to P _N.

That is, the pumping amount Q ₀ of the water absorption pumps P _{1 to} P _N is obtained by calculating the intersection of the QH curve shown in the following formula 1 and the load curve shown in the following formula 2. Note that the parameters a ₁ , a ₂ , a ₃ , b ₁ , b ₂ , b ₃ , c ₁ , c ₂ , c ₃ , d ₁ , d ₂ , and d ₃ in Equation 1 are the shapes of the QH curve. And changes according to the number of operating water pumps P _{1 to} P _N. For example, when the number of operating water pumps P _{1 to} P _N is u + 1, these parameters are expressed as Equation 3 below. In addition, the parameter u in Formula 3 indicates the number obtained by subtracting 1 from the number of operating units.

Therefore, the parameters a ₁ , a ₂ , a ₃ , b ₁ , b ₂ , b ₃ , c ₁ , c ₂ , c ₃ , d ₁ , d ₂ , d ₃ in Equation 1 and the parameter K in Equation 2 Is obtained, the QH curve and the load curve of the water absorption pumps P _{1 to} P _N can be calculated. Therefore, Formula 2 is transformed as shown in Formula 4 below, and Formula 1 is substituted into the parameter h on the right side of Formula 4. From Equation 4, parameters a ₁ , a ₂ , a ₃ , b ₁ , b _{2 in} Equation 1 are detected by detecting the average rotation speed n, pumping amount h, and water level difference H of the water absorption pumps P _{1 to} P _N. , B ₃ , c ₁ , c ₂ , c ₃ , d ₁ , d ₂ , d ₃ and the parameter K in Equation 2 can be calculated.

Based on the above idea, in the present embodiment, the control unit 10 based on the map shown in FIG. 3, during a steady operation in accordance with an electric signal input from the pumping quantity sensor QS and the rotational speed sensor S _A1 to S _AN It is determined whether or not the pumping amount q and the average rotation speed n of the water absorption pumps P _{1 to} P _N are within a predetermined range. Specifically, the control device 10 has a pumped amount q within a predetermined range Δq from the pumped amounts q ₁ , q ₂ , q ₃ , q ₄ , q ₅ , and the average rotational speed n is the average rotational speed n _1. , N ₂ , n ₃ , it is determined whether or not it is within a predetermined range Δn. Note that the map shown in FIG. 3 is prepared for each operating number of the water absorption pumps P _{1 to} P _N and stored in the control device 10 in advance. The control device 10 detects the number of operating water suction pumps P _{1 to PN} according to the electric signals input from the electric sensors S _{B1 to} S _BN, and reads a map corresponding to the detected operating number. In the present embodiment, the control device 10 performs control by using the average rotation speed n of the water absorption pumps P _{1 to} P _N , but the rotation speed used for water level control in the pump well 3. May be used.

When the pumping amount q and the average rotation speed n of the water suction pumps P _{1 to} P _N during the steady operation are within a predetermined range, the control device 10 is connected to a water level sensor L and a water level sensor (not shown) provided on the discharge rod 5 side. According to the input electric signal, the average water level difference h _{1 to} h ₁₃ between the sewage in the pump well 3 and the sewage in the discharge tank 5 at that time is detected, and the detected average water level difference h _{1 to} h ₁₃ and the water absorption pump P are detected. ₁ to associate the value of the pumping quantity _q 1 to q ₅ and the average rotational speed _n 1 ~n ₃ of to P _n are stored. Then, the control device 10 calculates the average water level differences h _{1 to} h ₁₃ stored in association with each other, the pumping amounts q _{1 to} q _{5 of the} water absorption pumps P _{1 to PN} , and the values of the average rotation speeds n _{1 to} n _3. By substituting into the determinant shown in FIG. 4, parameters a ₁ , a ₂ , a ₃ , b ₁ , b ₂ , b ₃ , c ₁ , c ₂ , c ₃ , d ₁ , d ₂ , d in Equation 1 ₃ and the parameter K in Equation 2 are calculated. Thus, it is possible to calculate the Q-H curve and the load curve of the water pump _P 1 to P _N.

As apparent from the above description, the control unit 10, pumping of water pump P ₁ to P _N q and average rotational speed n monitors whether within a predetermined range, water pump P ₁ to P _N When the amount of pumped water q and the average number of rotations n are within a predetermined range, the average water level difference h _{1 to} h ₁₃ at that time is detected. Then, the control device 10 associates the detected average water level differences h _{1 to} h ₁₃ with the pumping amounts q _{1 to} q ₅ and the average rotation speeds n _{1 to} n _{3 of the} corresponding water absorption pumps P _{1 to} P _N. The determinant shown in FIG. 4 shows the average water level differences h _{1 to} h ₁₃ , the pumping amounts q _{1 to} q _{5 of the} water absorption pumps P _{1 to} P _N and the average rotation speeds n _{1 to} n ₃ which are stored and associated with each other. By substituting into, the QH curves and load curves of the water absorption pumps P _{1 to} P _N are calculated. According to such a configuration, it is possible to automatically measure the QH curves of the water absorption pumps P _{1 to} P _N without stopping the operation of the water treatment plant facility. Further, as shown in FIG. 5, the QH curve changes from the curve L obtained during the trial run to the curve L ′ due to the change over time. As a result, the intersection of the QH curve and the load curve is a point P. To point P ′. Therefore, by enabling the automatic measurement of the QH curve, the behavior of the water treatment plant facility 1 can be simulated with high accuracy in consideration of the change of the QH curve due to secular change. Further, by collecting the QH curve for a long period of time, the change in the QH curve can be utilized for aging degradation diagnosis.

[Measurement method of efficiency curve]
Next, with reference to FIGS. 6-10, the operation of the control device 10 when measuring the efficiency curve of the water pump P ₁ to P _N.

The efficiency η of the water absorption pumps P _{1 to} P _N changes according to the discharge flow rate q. However, when the rotation speeds of the water absorption pumps P _{1 to} P _N change, as shown in FIG. 6, the efficiency curves LN _{1 to LN 3} of the water absorption pumps P _{1 to} P _N change according to the rotation speed, and the discharge flow rate Even when q is the same, the efficiency η changes. Further, when the discharge side pipes of the water absorption pumps P _{1 to PN} are gathered, as shown in FIG. 7, the efficiency curves LN _{1 to LN 3} of the water absorption pumps P _{1 to PN} have the same discharge flow rate q. Even in this case, it varies depending on the number of operating water pumps P _{1 to} P _N. In FIG. 7, efficiency curves LN1 to LN3 indicate the efficiency curves when the number of operating units is 1, 2, and 3, respectively.

In general, the efficiency curves of the water absorption pumps P _{1 to} P _N are expressed as Equation 5 shown below. The parameters K ₁₁ , K ₁₂ , K ₁₃ , K ₂₁ , K ₂₂ , K ₂₃ , K ₃₁ , K ₃₂ , and K ₃₃ in Equation 5 are parameters that define the shape of the efficiency curve, and the water absorption pumps P ₁ to It changes according to the number of operating _PN . For example, when the number of operating water pumps P _{1 to} P _N is u + 1, the parameters K ₁₁ , K ₁₂ , K ₁₃ , K ₂₁ , K ₂₂ , K ₂₃ , K ₃₁ , K ₃₂ , K ₃₃ in Equation 5 are , Which is expressed as Equation 6 below. In addition, the parameter u in Formula 6 indicates the number obtained by subtracting 1 from the number of operating units.

Therefore, by calculating the parameters K ₁₁ , K ₁₂ , K ₁₃ , K ₂₁ , K ₂₂ , K ₂₃ , K ₃₁ , K ₃₂ , K ₃₃ in Equation 5, the efficiency curves of the water absorption pumps P _{1 to} P _N are calculated. can do. Therefore, in this embodiment, the control unit 10 based on the map shown in FIG. 8, water pump P during steady operation in accordance with an electric signal input from the pumping quantity sensor QS and the rotational speed sensor S _A1 to S _{AN It} is discriminate | determined whether the pumping quantity q and average rotation speed n of _{1- PN} are in a predetermined range. Specifically, the control device 10 has a pumped amount q within a predetermined range Δq from the pumped amounts q ₁ , q ₂ , q ₃ , q ₄ , q ₅ , and the average rotational speed n is the average rotational speed n _1. , N ₂ , n ₃ , it is determined whether or not it is within a predetermined range Δn. The map shown in FIG. 8 is prepared for each operation number of the water absorption pumps P _{1 to} P _N and is stored in the control device 10 in advance. The control device 10 detects the number of operating water suction pumps P _{1 to PN} according to the electric signals input from the electric sensors S _{B1 to} S _BN, and reads a map corresponding to the detected operating number.

When the pumping amount q and the average rotation speed n of the water absorption pumps P _{1 to PN} during the steady operation are within a predetermined range, the control device 10 absorbs the water at that time according to the electric signals input from the electric sensors S _{B1 to} S _BN. detecting the efficiency η ₁ ~η ₉ of the pump _P 1 to P _N. Then, the control device 10 stores the detected efficiencies η _{1 to} η ₉ in association with the pumping amounts q _{1 to} q ₅ and the average rotational speeds n _{1 to} n _{3 of the} corresponding water absorption pumps P _{1 to PN.} Substituting the stored efficiency η _{1 to} η ₉ , the pumping amounts q _{1 to} q _{5 of the} water absorption pumps P _{1 to PN} , and the average rotation speed n _{1 to} n ₃ into the determinant shown in FIG. Thus, the parameters K ₁₁ , K ₁₂ , K ₁₃ , K ₂₁ , K ₂₂ , K ₂₃ , K ₃₁ , K ₃₂ , K ₃₃ in Equation 5 are calculated. Thereby, the efficiency curve of the water absorption pumps P _{1 to} P _N can be calculated.

As is clear from the above description, the control device 10 monitors whether or not the pumping amount q and the average rotational speed n of the water absorption pumps P _{1 to} P _N are within a predetermined range, and the water absorption pumps P _{1 to} P _When the pumping amount q of _N and the average rotation speed n are within a predetermined range, the efficiency η _{1 to} η ₉ of the water suction pumps P _{1 to} P _N at that time is detected. Then, the control unit 10, the detected intake pump _P 1 to P _N efficiency η ₁ ~η ₉ and the corresponding pumping quantity _q 1 to q ₅ and the average rotational speed _n 1 ~n of water pump _P 1 to P _{N 3} values and the associated and stored, associated to pumping amount _q 1 to q ₅ and the average rotation of the efficiency of the stored water pump _{P 1} ~P _{N η} 1 _{~η 9} and water pump _P 1 to P _N The efficiency curves of the water absorption pumps P _{1 to} P _N are calculated by substituting the values of the numbers n _{1 to} n _{3 into} the determinant shown in FIG. According to such a configuration, the efficiency curves of the water absorption pumps P _{1 to} P _N can be measured without stopping the operation of the water treatment plant facility. Further, as shown in FIG. 10, the efficiency curve changes from the curve L obtained during the trial operation to the curve L ′ due to the change over time. Therefore, by enabling automatic measurement of the load curve, it is possible to simulate the behavior of the water treatment plant facility 1 with high accuracy in consideration of the change of the load curve due to secular change. Further, by collecting the efficiency curve for a long period of time, the change in the efficiency curve can be used for aging degradation diagnosis.

  Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the description and the drawings that form a part of the disclosure of the present invention according to this embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

1 water treatment plant equipment 2 sand basin 3 the pump well 4 sewage 5 discharge sewer 6 water treatment facility 7 ₁ to _7-N pipe 10 controller L level sensor P ₁ to P _N intake pump QS pumping amount sensor S _A1 to S _AN rpm sensor S _B1 to S _BN electrical sensors V ₁ ~V _N-off valve

Claims (4)

A pump characteristic measuring method for measuring pump characteristics of a pump for pumping up sewage in a first water tank to a second water tank,
A first detection step for detecting a rotation speed and a pumping amount during steady operation of the pump;
A discriminating step for discriminating whether or not the number of rotations and the amount of pumped water detected by the first detection step are within a predetermined range;
When it is determined in the determination step that the rotational speed and the pumped amount are within a predetermined range, the sewage in the first water storage tank when the rotational speed and the pumped amount are within the predetermined range And a second detection step for detecting at least one of a difference in water level between the sewage in the second water tank and the efficiency of the pump;
A storage step of associating and storing the rotation speed and the pumping amount corresponding to at least one of the water level difference and the efficiency detected by the second detection step;
A calculation step of calculating at least one of a QH curve and an efficiency curve of the pump using at least one of the water level difference and the efficiency stored in association with each other in the storage step, and the rotation speed and the pumping amount; ,
A pump characteristic measuring method comprising: A third detection step of detecting the number of operating pumps;
The determination step reads out a map corresponding to the number of operating units detected by the third detecting step from the map indicating the predetermined range of the rotational speed and the pumped amount prepared for each number of operating pumps, The pump characteristic measuring method according to claim 1, further comprising a step of determining whether or not the rotational speed and the pumped water amount are within a predetermined range based on the read map. A pump characteristic measuring device for measuring pump characteristics of a pump for pumping up sewage in a first water tank to a second water tank,
A rotational speed detection means for detecting the rotational speed during steady operation of the pump;
Pumping amount detection means for detecting the pumping amount during steady operation of the pump;
Discriminating means for discriminating whether or not the rotational speed and the pumped amount detected by the rotational speed detecting means and the pumped water amount detecting means are within a predetermined range;
When the rotational speed and the pumped amount are determined to be within a predetermined range by the determining means, the sewage in the first water storage tank when the rotational speed and the pumped amount are within the predetermined range Detecting means for detecting at least one of a difference in water level between sewage in the second water tank and the efficiency of the pump;
At least one of the water level difference and efficiency detected by the detection means is stored in association with the rotational speed and the pumped amount, and at least one of the water level difference and efficiency stored in association with the rotational speed is stored. And calculating means for calculating at least one of a QH curve and an efficiency curve of the pump using the pumped amount,
A pump characteristic measuring apparatus comprising: An operation number detecting means for detecting the number of operating pumps;
The discriminating means includes a map showing a predetermined range of the rotation speed and the pumped amount prepared for each number of operating pumps, and reads and reads a map corresponding to the operating number detected by the operating number detecting means. The pump characteristic measuring device according to claim 3, wherein it is determined whether or not the rotation speed and the pumped water amount are within a predetermined range based on a map that is output.

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