JP2016206073A - Method and device for estimating flow rate of pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for estimating a flow rate, which enables accurate estimation of the flow rate from a pump used with an outlet opened, and which does not need expensive equipment.SOLUTION: The method for estimating a flow rate of a pump includes: detecting each flow rate value corresponding to a current or power value for driving the pump, by prior measurement performed in advance; storing correspondence of the current or power value to the flow rate value; and determining whether a current or power value measured during flow rate estimation when the pump is used is within the range of the current or power value set in the correspondence. When it is determined that the measured current or power value is within the range, a flow rate or an accumulated flow rate is estimated on the basis of the measured current or power value, using the stored correspondence. When it is determined that the current or power value is outside the range, the measured current or power value is stored. In such a case, fluctuation or change of the lift of the pump is determined to be occurring, and therefore, a flow rate value corresponding to the current or power value is measured, and correspondence therebetween is stored additionally.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique for estimating a flow rate of a pump, and more particularly, to a pump flow rate estimation method and a pump flow rate estimation apparatus that estimate a flow rate of a pump to be used in a state where a pump discharge port is opened.

  Groundwater is used as industrial water, agricultural water, and domestic water. In recent years, it has become a cause of land subsidence and groundwater level decline throughout the country, so the groundwater collection permission (report) system has been established by ordinance and reports the flow rate used. It is becoming mandatory. The groundwater usage flow rate is measured by a flow meter or flow weir installed in the pump, but in many cases it is calculated by the operation time for the flow rate per minute determined by the pump outlet diameter. It is calculated simply.

For example, as shown in the well water usage measuring device of Patent Document 1, the flow rate per hour is measured in advance, and the amount of well water used is measured according to the operating time of the pump when the well water is used. Has been proposed.
This well water usage measuring device is structured to control the pressure at the discharge port instead of opening it, but it integrates the rotational speed of the synchronous motor measured at a frequency synchronized with the pumping motor operated at the power (commercial) frequency. When used in the above, the frequency and voltage of the pumping motor are controlled and the frequency fluctuates by performing inverter control. As a result, since the rotational speed of the synchronous motor is different from the accumulated time, the presence / absence of current is detected by the annular core around which the coil is wound, and the energization time is measured.

  In addition, in order to accurately measure the groundwater sampling flow rate, it is recommended to install a water measuring device such as an ultrasonic or electromagnetic flow meter, but there is a problem that it is expensive and expensive to install. did.

JP 2013-174138 A

  When estimating the flow rate during the operation time of the pump that opens the discharge port, when estimating from the flow rate per unit time (1 minute) set by the tube discharge port diameter and the operation time, the heads that use environment varies depending on the pump. Due to the difference in flow rate, the flow rate is different even with the same discharge port diameter, and the flow rate is not accurately measured.

  Therefore, the flow rate per hour is measured in advance, and the flow rate is estimated based on the operation time of the pump using the numerical value. That is, since the flow rate is estimated in consideration of the operation time with reference to the flow rate measured in advance instead of the flow rate uniformly determined by the discharge port diameter, the accuracy can be improved. A pump that is operated with an open discharge port normally has no pressure change during operation, and therefore, by using a flow rate per hour measured in advance, an almost accurate flow rate can be measured.

However, when a valve or the like set in the pipe is adjusted during the operation of the pump, the pump head changes, and a phenomenon occurs in which the flow rate is different from the flow rate measured in advance. In other words, the flow estimation by this method may be in the state where the pump operation is measured in the form of prior measurement, but if the valve installed in the pump piping is reset, the flow rate per hour measured in advance And will be different.
Therefore, it is not possible to judge the change or fluctuation of the head during the operation of the pump only by measuring the operation time, and the flow rate is estimated in the state of prior measurement, resulting in a large error in the estimated flow rate. was there.
In addition, in order to determine the flow rate per hour to be measured in advance, the flow rate is measured by an hour meter, so that there is a problem that it takes time for the preliminary measurement.

During pump operation, when the discharge port is used with an open outlet, adjustment of the change and fluctuation of the head requires changing the piping arrangement, increasing or decreasing the discharge port, and adjusting the valve before operation. Since the adjustment is performed manually, it is extremely difficult to make the setting completely the same as the previous setting (previous state).
Also, in the state where the operation has been set, adjustment with other factors (for example, intentionally changing the head and grasping its characteristics) is not preferable.

  The present invention has been proposed in view of the above circumstances, and provides a pump flow rate estimation method and a pump flow rate estimation device that can accurately estimate the flow rate from a pump that is used with an open discharge port without expensive equipment. It is intended to provide.

In order to achieve the above object, the pump flow rate estimation method of the present invention makes it possible to determine whether there is a change or fluctuation in the head of the pump in operation, thereby adjusting the pre-measurement value used as a reference for flow rate estimation again. Then, the flow rate can be estimated in the state after readjustment so that accurate flow rate estimation is continuously performed.
For this purpose, the operating current value (current value) or power consumption value (power value) of the pump is related to the flow rate value per unit time by prior measurement, and the pump is operated within the range of the current value or power value associated in advance. If it is determined that there is no change in the pump head state, it is determined that the current value or power value outside the range is different from the pre-measurement state. By associating, the accuracy of flow estimation is maintained.

That is, a pump flow rate estimation method according to claim 1 of the present invention is a method for estimating a flow rate of a pump that uses a discharge port in an open state.
Detecting the flow value for the current value or power value for driving the pump in advance by pre-measurement, storing the correspondence relationship of the current value or power value for the flow value,
Determining whether the current value or power value measured at the time of flow rate estimation when using the pump is within the range of the current value or power value set in the correspondence relationship;
If determined to be within the range, the flow rate or integrated flow rate is estimated from the stored correspondence based on the measured current value or power value,
If it is determined that it is out of the range, the measured current value or power value is stored, and it is determined that the pump head has fluctuated or changed, and the flow rate value for the current value or power value is measured. These correspondence relationships are additionally stored.

Claim 2 is the pump flow rate estimation method of claim 1,
When it is determined that the value is out of the range, the flow rate value corresponding to the current value or the power value is notified that it is necessary to measure again in advance.

A pump flow rate estimation device according to claim 3 of the present invention is a device that estimates the flow rate of a pump that uses a discharge port in an open state, and includes the following configuration.
In the device that estimates the flow rate of the pump that uses the discharge port in the open state,
A storage unit that detects the flow value for the current value or the power value for driving the pump in advance by performing pre-measurement, and stores the current value or the power value for the flow value as a correspondence relationship;
A sensor unit for detecting a current value or a power value for driving the pump.
A measurement unit that measures a current value or a power value detected by the sensor unit during operation.
A flow rate estimation unit that estimates a flow rate or an integrated flow rate from a correspondence relationship of the storage unit based on a current value or a power value measured by the measurement unit during flow rate estimation when the pump is in operation.
A discriminating device for discriminating whether or not the current value or power value measured in the flow rate estimation of the pump is within the range of the current value or power value set in the correspondence relationship.

  According to a fourth aspect of the present invention, in the pump flow rate estimating apparatus of the third aspect, the detection of the flow value by the preliminary measurement is performed by an ultrasonic flow meter or an electronic flow meter.

  5. The pump flow rate estimation apparatus according to claim 3, wherein a flow meter is installed in the pump, a flow rate value detected by the flow meter is measured by the measurement unit, and a current value detected by the sensor unit. Alternatively, the preliminary measurement is performed by storing the correspondence relationship with the power value in the storage unit.

Claim 6 is the pump flow rate estimation apparatus of claim 3,
When it is determined that the determination device is within the range, the flow rate estimation unit estimates a flow rate or an integrated flow rate with respect to the measured current value or power value.

Claim 7 is the pump flow rate estimation apparatus according to claim 5,
When it is determined that the determination device is out of the range, it is determined that the pump head has fluctuated or changed, and the current value or power value measured by the measurement unit is stored in the storage unit. ,
The correspondence relationship is additionally stored in the storage unit by measuring the flow rate value with respect to the current value or the power value in the measurement unit and performing pre-measurement again.

Claim 8 is the pump flow rate estimation apparatus of claim 7,
In the case where it is determined that the determination device is out of the range, the measurement unit is provided with notification means for notifying that measurement of a flow rate value for the current value or power value is necessary.

Claim 9 is the pump flow rate estimation apparatus of claim 8,
The notification means is formed by a display unit.

A pump flow rate estimation device according to claim 10 of the present invention is a device for estimating a flow rate of a pump that uses a discharge port in an open state.
A main unit having a sensor unit that detects a current value or a power value for driving the pump, and a transmission unit that transmits data of the current value or power value detected by the sensor unit and measurement time as measurement data;
It is installed in a remote location with respect to the main device, and is detected by a pre-measurement performed in advance for a flow rate value corresponding to a current value or a power value for driving the pump, and the current value or power value for the flow rate value is stored as a correspondence relationship. Correspondence of the storage unit based on the current value or the power value received by the receiving unit when estimating the flow rate during operation of the pump, the receiving unit that receives data transmitted from the transmitting unit A flow rate estimator for estimating a flow rate or an integrated flow rate from the relationship, and whether the current value or power value measured in the flow rate estimation of the pump is within the range of the current value or power value set in the correspondence relationship. A server device having a determining device for determining;
It is characterized by having.

  According to the present invention, when estimating the flow rate of a pump that is operated with the discharge port open, the flow rate during pump operation is estimated based on the flow rate value with respect to the current value (power value) stored by the preliminary measurement before operation. If the current value (power value) measured during pump operation is not within the range of the current value (power value) stored in the correspondence relationship, it is determined that a change or fluctuation in the head has occurred, and By additionally storing the flow rate value corresponding to the current value (power value) newly measured in the measurement, it is possible to estimate the flow rate based on the flow rate value, and when the head fluctuates during pump operation However, it is possible to estimate the flow rate with low cost and high accuracy.

  By detecting the flow value by the prior measurement with an ultrasonic flow meter or electronic flow meter, the flow value for the current value or power value is measured with time-series data at the same time. And the correspondence relationship with the power value can be measured in a short time (several minutes).

  In addition, a sensor unit and a transmission unit are installed in the main unit near the installation location of the pump, and the flow rate estimation processing is performed by a server device installed in a remote location. It can be managed collectively on the ground.

It is a block diagram which shows the whole structure of the pump flow volume estimation apparatus which concerns on one Embodiment of this invention. It is a graph which shows the measurement result of the electric current value and flow rate value when operating a pump for the pumping of water to a water storage tank. It is a block diagram which shows the whole structure of the pump flow volume estimation apparatus which concerns on other embodiment of this invention. It is a flowchart figure which shows the process sequence in the case of performing a prior measurement. It is a flowchart figure which shows the process sequence in the case of performing measurement at the time of operation (pump flow rate estimation). It is a block diagram which shows the other example of the pump flow volume estimation apparatus of this invention. It is a block diagram which shows the other example of the pump flow volume estimation apparatus of this invention.

(Embodiment 1)
A pump flow rate estimation apparatus for realizing a pump flow rate estimation method according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, the pump flow rate estimation device includes a main device 1 that obtains data necessary for pump flow rate estimation and performs flow rate estimation, and a pump 3 that is a target of flow rate estimation. .

One side of the pump 3 is connected to a well having groundwater via a pipe 6a, and groundwater is supplied to, for example, agricultural land via a pipe 6b connected to the other side. Electric power is supplied to the pump 3 from the distribution board 5 connected to the distribution system via the power supply line 4. Since the switchboard 5 is connected to the power supply line 4 in which a breaker and a timer are installed, the operation of the pump 3 and the manual operation can be performed in a certain time set by the opening and closing of the power supply and the timer. it can.
In addition, the switchboard 5 is provided with a sensor unit 2 that detects a current value or a power value for driving the pump 3.

  The main device 1 detects the current value or power value for driving the pump 3 during the pump operation, and the pre-measurement performed in advance for the flow value for the current value or power value for driving the pump 3, A storage unit 12 that stores the current value or power value with respect to the flow rate value as a correspondence relationship, a flow rate estimation unit 13 that estimates a flow rate during pump operation from the stored correspondence relationship data, a display of the estimated flow rate, and the like A display unit 14 to perform, a setting unit 15 in which an operator sets a correspondence relationship between a current value (power value) and a flow rate value, and a control unit 10 to perform transmission / reception of data between the units to perform a desired process. Configured.

  The storage in the storage unit 12 by the pre-measurement is performed, for example, before the main device 1 is attached to the pump installation location. In this case, the pump 3 is separately provided with a measuring device composed of a power meter (power sensor) 2 ′ and an ultrasonic flowmeter 7 ′, and the time series data as shown in FIG. Current waveform (power waveform) and flow rate waveform are captured, and the correspondence relationship between the current or electric energy and the flow rate at the same time is confirmed. Then, the operator sets the correspondence from the setting unit 15 of the main apparatus 1 and stores it in the storage unit 12.

  Fig. 2 shows a pump for pumping water to a water storage tank. A current transformer, digital oscilloscope and ultrasonic flowmeter are installed on the pump 3 side. The measured current waveform (dotted line) and flow rate waveform (solid line) of the pump 3 Is a graph in which is plotted. From FIG. 2, it can be observed that the current waveform (dotted line) corresponds to the flow rate waveform (solid line) with substantially the same waveform, and it can be understood that the flow rate can be estimated from the current value. Since the pump in FIG. 2 is for pumping water to the water storage tank, it is repeatedly turned on and off depending on the water level. However, when the discharge port is open, the same current value and flow rate value will continue.

You may comprise so that the memory | storage to the memory | storage part 12 by prior measurement may be performed using the sensor part 2 installed in the pump 3, as shown in FIG. In this case, a flow rate measuring device (flow meter) 7 as a flow rate sensor is installed in the pipe 6b of the pump 3, and the measuring unit 11 detects the flow rate value from the flow rate measuring device 7 and the sensor unit 2 with respect to this flow rate value. The correspondence (data at the same time in time series) with the measured current value or power value is measured. And the memory | storage part 12 memorize | stores the correspondence with the electric current value or electric power value detected by the sensor part 2 with respect to the flow volume value detected with the flow measuring device 7. FIG.
At the time of estimating the flow rate during pump operation, the measuring unit 11 measures the current value or the power value detected by the sensor unit 2.

  The flow rate estimation unit 13 in FIGS. 1 and 3 estimates the flow rate or the integrated flow rate from the correspondence relationship between the current value (power value) stored in the storage unit 12 and the flow rate value. The flow rate estimation unit 13 determines whether or not the current value (power value) measured in the flow rate estimation during pump operation is within the range of the current value or power value set as a correspondence relationship in the storage unit 12. Equipment.

  The display unit 14 is configured by, for example, a display device, and can notify the necessity of displaying the estimated flow rate and re-measuring the correspondence between the power value (voltage value or current value) and the flow rate value, which will be described later. The notification of the remeasurement may be performed by a warning lamp that is visually recognized or a speaker that is visually recognized.

The setting unit 15 inputs and sets the correspondence relationship between the power value (voltage value or current value) and the flow rate value by pre-measurement performed in advance or re-pre-measurement during pump operation described later.
In the case of re-preliminary measurement in the form of FIG. 3 in which the flow rate measuring device (flow meter) 7 is installed and the flow rate waveform is measured by the measurement unit 11 together with the current (power) waveform of the sensor unit 2, the discrimination device of the flow rate estimation unit 13 Based on the determination result, the control unit 10 that has detected the pump head change automatically sets the correspondence between the current value (power value) measured by the measurement unit 11 and the flow rate value in the setting unit 15, and the storage unit 12. You may comprise so that it may memorize | store.

  Next, the case of estimating the pump flow rate (the total flow rate from the start of pump pumping) at the time of pump operation using the above-described pump flow rate estimation device will be described with reference to the flowcharts of FIGS. . When the pump flow rate estimation apparatus estimates the pump flow rate during operation, it is necessary to perform each process of prior measurement (FIG. 4) and operation measurement (FIG. 5).

First, the pump 3 is pre-measured before the pump is operated (step 20). As described above, the pre-measurement is performed by the measurement device separately installed in the pump 3 before the main device 1 is installed in a predetermined place, and by the sensor unit 2 and the flow rate measuring device 7 installed in the pump 3. There are cases. For example, when the measurement is performed by a separately installed measuring device, the power meter 2 'is installed on the switchboard 5 side of the pump 3, the ultrasonic flowmeter 7' is installed on the pipe 6, and then the pump 3 is operated manually ( Step 21) After confirming the transition from the initial operation to the steady operation (Step 22), the power value Po [kW] is measured by the power meter 2 ′ and the flow rate Ro [ m ³ / h] is measured (step 23).

  When the operation time of the conventional pump is used as a reference, it takes about 1 hour to measure the flow rate because time is used as an index. However, the power value Po [kW] and the current value (Fig. 2) Measurement in a short time (several minutes) is possible by measuring the flow rate corresponding to the index. For measurement of the flow rate, an electromagnetic flow meter may be used instead of the ultrasonic flow meter. Moreover, you may make it measure the flow volume per unit time discharge | released from an open discharge port using the open channel flowmeter using a weir (it can also be a dredging or a tank). In this case, it takes several tens of minutes to measure the flow rate.

  The data to be measured is the power value [kW] measured by the energy meter, but instead of directly measuring the power value [kW], the current value [A] and voltage value [V] are measured by the current transformer and measurement transformer. ] May be measured. The measured current value and voltage value may be effective values. Further, only the current value may be measured, and in that case, it may be an effective value. Moreover, the value sampled with the AD converter may be sufficient.

The pre-measured power value Po [kW] and flow rate value Ro [m ³ / h] are manually set and input by the operator from the setting unit 15 of the main apparatus 1, and the control unit 10 uses these values as correspondences. It memorize | stores in the memory | storage part 12 (step 24).
Alternatively, in the case of the configuration of FIG. 3 in which a flow rate measuring device (flow meter) 7 is installed and the flow rate waveform is measured by the measurement unit 11 together with the current (power) waveform of the sensor unit 2, the current value measured by the measurement unit 11 ( The correspondence relationship between the power value and the flow rate value may be automatically stored in the storage unit 12.

Next, the flow rate estimation during the operation of the pump that has been measured in advance will be described.
During pump operation, measurement during operation (step 30) is performed by the sensor unit 2 installed on the switchboard 5. As the sensor unit 2, a current transformer and a measurement transformer are attached, and a current waveform and a voltage waveform supplied from the power supply line 4 to the pump 3 are measured, and the sampling period T [min in the measurement unit 11 of the main apparatus 1. ] To obtain the current value Is [A] and the voltage value Vs [V] sampled in step 31 (step 31).

  Here, the sampling period T [min] is set to 1 minute interval T = 1 [min]. The sampling period is preferably an integer that is divisible by 60 because one hour is 60 minutes. Even if the sampling period is smaller than 1 minute interval, since 1 minute is 60 seconds, a period that divides 60 is desirable.

The flow rate estimation unit 13 calculates the power value Ps [kW] from the current value Is [A] and the voltage value Vs [V] sampled by the measurement unit 11 (step 32).
Then, in the discrimination device in the flow rate estimation unit 13, it is determined whether the power value Ps [kW] satisfies the range of the power value Po (Equation 1) stored in the preliminary measurement (step 33). Α in Equation 1 is a constant selected based on the variation in the head due to the season and sampling, and is a smaller value than the head of the pipe.

  Po-α [kW] <Ps [kW] <Po + α [kW] (Equation 1)

  When it is determined in the determination device that the operating state of the pump operated in the control unit 10 is equivalent to the pre-measurement (the power value Ps [kW] satisfies Equation 1), the control unit 10 As shown in Equation 2, the power Ps [kW] with a newly measured sampling interval is added to the past accumulated power amount Pd [kWh] stored in the storage unit 12 as shown in Equation 2.

  Pd [kWh] = Ps [kW] / 60 + Pd [kWh] (Formula 2)

  And the control part 10 updates Pd [kWh] of the memory | storage part 12 with the integrated electric energy Pd [kWh] calculated by Formula 2 (step 34).

The total flow rate Rd [m ³ ] pumped up by the pump 3 is stored in the flow rate estimation unit 13 using the pre-measured flow rate Ro [m ³ / h] and the accumulated power amount Pd [kWh] stored in the storage unit 12. Then, the calculation is performed according to Equation 3 (step 35).

Rd [m ³ ] ＝ Pd [kWh] ÷ Po [kW] × Ro [m ³ / h] (Formula 3)

The total flow rate Rd [m ³ ] is displayed on the display unit 14 so that the estimated pump flow rate (total flow rate) can be confirmed.

When the calculated power value Ps [kW] is out of the range of Equation 1 for a certain time or longer, the discriminating device of the flow rate estimation unit 13 changes the pump head by adjusting the setting of the valve and the flow rate is changed. determines that differs from the pre-measurement (step 36), the display unit 14 via the control unit 10 displays "measurement required" (step 37), Pr outside the range changes from P ₀ [kW] [ The change time of kW] and the accumulated electric energy of Pr [kW] until the previous preliminary measurement is performed are stored as needed (step 38).

The operator who has recognized “measurement required” by notification, notification, notification, etc. prepares for the preliminary measurement again, and performs the preliminary measurement again to measure the correspondence between the power value and the flow rate (step 39).
In the previous pre-measurement, the power value Ps [kW] that is measured and calculated is out of the range of Equation 1 that is the allowable range of P ₀ [kW], where Pr [kW] This power value Pr [kW] and the corresponding flow rate are stored in the storage unit 12 as a new correspondence relationship (step 40).
Then, the accumulated power amount Pdr [kWh] of the newly changed power value Pr [kW] is calculated from Equation 4 from the separately accumulated power amount Pdr [kWh] = 0 and stored in the storage unit 12 (step 41).

  Pdr [kWh] = Pr [kW] / 60 + Pdr [kWh] (Formula 4)

That is, as a response to the “measurement required” displayed on the display unit 14, measurement data is set and stored in the storage unit 12 by the setting unit 15 of the main apparatus 1 as in the previous measurement described above. Is done. Then, the flow rate Rr [m ³ / h] corresponding to the power value Pr [kW] is stored in the storage unit 12, and the integrated flow rate Rdr [m ³ ] is calculated by Equation 5 (step 42).
Or when making the output of the flow measuring device 7 input into the measurement part 11, the correspondence of the electric power and flow volume is memorize | stored.

Rdr [m ³ ] = Pdr [kWh] ÷ Pr [kW] × Rr [m ³ / h] (Formula 5)

  Thereafter, if the power value Ps [kW] calculated from the measured value is in the range of either Po [kW] or Pr [kW], the individual integrated power amounts Pd [kWh] and Pdr [kWh] are stored. Therefore, the integrated flow rate can be easily calculated. The correspondence relationship between the power value and the flow rate value stored in the storage unit 12 includes a plurality of power values Pr [kW] corresponding to changes in the head in addition to the power value Po [kW] measured in advance. Also good.

  In the above-described flow rate estimation apparatus, the example in which the flow rate is estimated using the power value [kW] measured by the sensor unit 2 and the integrated power amount [kWh] stored in the storage unit 12 has been described. The current value [A] measured by the unit 2 as shown in FIG. 2 and the integrated current amount [Ah] stored in the storage unit 12 may be used. In this case, the sensor unit 2 is composed only of a current transformer, and an expression for determining whether or not it is within the range is expressed by Expression 6 (corresponding to Expression 1). β is a constant that is selected based on the variation in the head height due to the season or sampling, as in α in Equation 1.

  Setting current-β [A] <Measurement current [A] <Setting current + β [A] (Formula 6)

FIG. 6 is a configuration in which a communication unit 16 is provided in the main apparatus 1 of the pump flow rate estimation apparatus of FIG. 1 and a function is added to enable communication of the situation to the outside when the head is changed and the flow rate is different from the pre-measurement. Indicates.
According to the configuration of the pump flow rate estimation device, when the calculated power value Ps [kW] is out of the range of the expression 1 for a certain time or more during the pump operation, the flow rate estimation unit 13 sets a valve or the like. It is determined that the head is changed and the flow rate is different from the pre-measurement, and “Measurement Required” is displayed on the display unit 14 via the control unit 10, and “Measurement Required” is displayed to an external administrator via the communication unit 16. report. Thereby, it can grasp | ascertain that re-measurement is required in the position away from the pump installation place, and can maintain highly accurate flow volume estimation by responding.
Until the re-measurement, the electric energy Pr [kW] and Pdr [kwh] after “measuring required” are held in the storage unit 12. Various forms of communication by the communication unit 16 are possible.
In addition, the same effect can be obtained by providing the main unit 1 with the communication unit 16 for the configuration in FIG. 3 in which the pre-measurement and the re-pre-measurement are performed by the measurement unit 11.

(Embodiment 2)
Another embodiment of the pump flow rate estimation apparatus is shown in FIG. This pump flow rate estimation device includes the server device 9 and thus has a configuration that emphasizes the communication function of the embodiment of FIG.
In the pump flow rate estimating apparatus of FIG. 7, the same reference numerals are given to the portions having the same configuration as that of FIG. In the pump flow rate estimation apparatus of FIG. 7, the flow rate measuring device 7 that outputs a flow rate value to the measurement unit 11 is not provided. In the following, different configurations will be mainly described.

The main device 1 includes a watt-hour meter 17 that measures the power of the switchboard 5 and a transmission unit 18 for communicating the measured data, and has the same function as the watt-hour meter with a communication function. The transmission unit 18 transmits the power value measured by the watt hour meter 17 and the measurement time to the server device 9 as measurement data. The power meter 17 is supplied with a power supply voltage via the distribution line 8. Further, the watt hour meter 17 may be a measuring device capable of measuring electric power instead of a meter.
The server device 9 receives the measurement data transmitted from the transmission unit 18 of the main device 1, the control unit 10, the storage unit 12, the flow rate estimation unit 13, the display unit 14, and the setting unit 15 in FIG. 5. Each includes a corresponding control unit 90, storage unit 92, flow rate estimation unit 93, display unit 94, and input unit 95.

The electric power used in the pump 3 is supplied from the switchboard 5 via the power supply wire 4, and when the load of the switchboard 5 is mainly the pump 3, the watt-hour meter 17 that measures the power used in the switchboard 5 The integrated power amount is almost equal to the pump power consumption.
In this case, the watt-hour meter 17 can use the watt-hour meter with communication function installed by the power company as a substitute for the watt-hour meter 17 and the transmission unit 18, and the watt-hour meter with communication function collected by the watt-hour meter. The main unit 1 is installed on the operator side by receiving the integrated power amount value at intervals (usually every 30 minutes) by the receiving unit 91 (the power meter with communication function installed by the power company is handled as the main unit 1). do not have to. Further, the main device 1 attached to the distribution line 8 in FIG. 7 may be installed on the power supply line 4 to the pump 3.
The integrated power amount measured by the watt hour meter 17 of the main device 1 is periodically transmitted (collected) to the server device 9 side via the transmission unit 18. The accumulated power amount data collected by the server device 9 is stored in the storage unit 92 according to an instruction from the control unit 80 after being received by the receiving unit 91. According to this pump flow rate estimation apparatus, the integrated electric energy related to pump operation collected periodically (for example, every 30 minutes) can be used as flow rate estimation data.

The power value Po [kW] and the flow rate value Ro [m ³ / h] measured in advance by the watt-hour meter 17 of the main device 1 before the pump operation are set and input from the input unit 95 of the server device 9, and the control unit 90 Is stored in the storage unit 92.
The control unit 90 uses the accumulated power amount Pd (n) related to the pump operation collected at 30-minute intervals and the accumulated power amount Pd (n−1) 30 minutes before, which are stored in the storage unit 92 at time n. The electric power value Ps (n) [kW] is calculated by Equation 7.

  Ps (n) = (Pd (n) −Pd (n-1)) × 2 [kW] (Formula 7)

If the calculated Ps [kW] is within the range of Equation 1 described above, it is determined that the operating state of the pump 3 operated by the control unit 90 is equivalent to the preliminary measurement.
Then, the total integrated flow rate is calculated as Rd (n) [m ³ ] by Equation 8.

Rd (n) [m ³ ] = Pd (n) [kWh] ÷ Po [kW] × Ro [m ³ / h] (Formula 8)

When the calculated power value Ps [kW] becomes a power value Pr [kW] outside the range of Equation 1 for a certain time or more, the control unit 90 changes the head by adjusting the setting of the valve and the like. The flow rate is determined to be different from the pre-measurement, and “measurement required” is displayed on the display unit 94.
The formula for calculating Pr (n) [kW] determined to be different from the power value Po [kW] measured in advance is shown in Formula 9 for reference.

    Pr (n) = (Pd (n) −Pd (n-1)) × 2 [kW] (Formula 9)

In a different area of the storage unit 92, the calculated numerical value of Formula 9, the time n, and the accumulated power amount Pd (n) collected are stored. As a result, the subsequent collected integrated power amount Pd (n + 1) is used for flow rate calculation at the Rr flow rate [m ³ / h] that will be measured in the future with the power amount Pr [kW].

  According to this pump flow rate estimation device, only the watt hour meter 17 and the transmission unit 18 are installed in the main device 1 near the installation location of the pump 3, and the flow rate estimation process is performed by the server device 9 installed in a remote location. For example, when managing the flow rates of a plurality of pumps with different installation locations, efficient processing by collective management can be performed.

According to each pump flow rate estimation apparatus mentioned above, when estimating the flow rate of the pump 3 operated with the discharge port opened, the storage unit 12 (storage unit) is pre-measured by the measurement unit 11 (watt-hour meter 17). 92) is used to estimate the flow rate during pump operation based on the flow rate value stored in the current value (power value) stored in 92), and the current value (power value) measured during pump operation is set in a corresponding relationship. If it is not within the range of (power value), it is determined that a change or variation in the head has occurred in the discrimination device of the flow rate estimation unit 13 (flow rate estimation unit 93), and the measurement unit 11 (watt hour meter 17) newly measures. In addition, the flow rate value corresponding to the current value (power value) is additionally stored in the storage unit 12 (storage unit 92), and the flow rate is estimated based on the flow rate value, so that when the head fluctuates during pump operation, Even cheaper It is possible to perform flow rate estimation secured in degrees.
In other words, when estimating the flow rate of a pump that is used with the discharge port open, it is possible to determine whether or not there is adjustment by the head on the device side, so that the operation time can be measured without using an expensive water meter. Therefore, it is possible to estimate in accordance with an error caused by a head change / variation that is difficult to achieve, and the accuracy of the estimated flow rate can be improved.

  DESCRIPTION OF SYMBOLS 1 ... Main apparatus, 2 ... Sensor part, 2 '... Electric energy measuring device (electric power sensor), 3 ... Pump, 4 ... Electric power supply line, 5 ... Distribution board, 6a, 6b ... Piping, 7 ... Flow measuring device (flow meter) ), 7 '... ultrasonic flowmeter, 8 ... distribution line, 9 ... server device, 10 ... control unit, 11 ... measurement unit, 12 ... storage unit, 13 ... flow rate estimation unit (discriminating device), 14 ... display unit, DESCRIPTION OF SYMBOLS 15 ... Setting part, 16 ... Communication part, 17 ... Electricity meter, 18 ... Transmission part, 90 ... Control part, 91 ... Reception part, 92 ... Memory | storage part, 93 ... Flow estimation part, 94 ... Display part, 95 ... Input Department.

Claims (10)

In the method of estimating the flow rate of a pump that uses the discharge port in an open state,
Detecting the flow value for the current value or power value for driving the pump in advance by pre-measurement, storing the correspondence relationship of the current value or power value for the flow value,
Determining whether the current value or power value measured at the time of flow rate estimation when using the pump is within the range of the current value or power value set in the correspondence relationship;
If determined to be within the range, the flow rate or integrated flow rate is estimated from the stored correspondence based on the measured current value or power value,
If it is determined that it is out of the range, the measured current value or power value is stored, and it is determined that the pump head has fluctuated or changed, and the flow rate value for the current value or power value is measured. A pump flow rate estimation method characterized by additionally storing these correspondences.   2. The pump flow rate estimation according to claim 1, wherein when it is determined that the flow rate is out of the range, the flow rate value for the current value or the power value is notified to be measured again in advance measurement. Method. In the device that estimates the flow rate of the pump that uses the discharge port in the open state,
A sensor unit for detecting a current value or a power value for driving the pump;
A storage unit that detects the flow value for the current value or the power value for driving the pump in advance by performing pre-measurement, and stores the current value or the power value for the flow value as a correspondence relationship;
A measurement unit that measures the current value or the power value detected by the sensor unit during operation;
When estimating the flow rate during operation of the pump, based on the current value or power value measured by the measurement unit, a flow rate estimation unit that estimates the flow rate or the integrated flow rate from the correspondence relationship of the storage unit,
A pump comprising: a determination device configured to determine whether a current value or a power value measured in the flow rate estimation of the pump is within a range of a current value or a power value set in the correspondence relationship; Flow rate estimation device.   The pump flow rate estimation apparatus according to claim 3, wherein the detection of the flow value by the preliminary measurement is performed by an ultrasonic flow meter or an electronic flow meter.   A flow meter is installed in the pump, and the measurement unit can measure a correspondence between a flow value detected by the flow meter and a current value or a power value detected by the sensor unit, and the correspondence The pump flow rate estimation apparatus according to claim 3, wherein the preliminary measurement is performed by storing in the storage unit.   The pump flow rate estimation apparatus according to claim 3, wherein the flow rate estimation unit estimates a flow rate or an integrated flow rate with respect to a measured current value or power value when the discrimination device determines that it is within the range. When it is determined that the determination device is out of the range, it is determined that the pump head has fluctuated or changed, and the current value or power value measured by the measurement unit is stored in the storage unit. ,
The pump flow rate estimation apparatus according to claim 5, wherein the correspondence relationship is additionally stored in the storage unit by measuring the flow rate value with respect to the current value or the power value in the measurement unit and performing preliminary measurement again.   8. The pump according to claim 7, further comprising notification means for notifying that the flow rate value for the current value or the power value needs to be measured in the measurement unit when the determination device determines that it is out of the range. Flow rate estimation device.   The pump flow rate estimation apparatus according to claim 8, wherein the notification unit is formed by a display unit. In the device that estimates the flow rate of the pump that uses the discharge port in the open state,
A main unit having a sensor unit that detects a current value or a power value for driving the pump, and a transmission unit that transmits data of the current value or power value detected by the sensor unit and measurement time as measurement data;
It is installed in a remote location with respect to the main device, and is detected by a pre-measurement performed in advance for a flow rate value corresponding to a current value or a power value for driving the pump, and the current value or power value for the flow rate value is stored as a correspondence relationship. Correspondence of the storage unit based on the current value or the power value received by the receiving unit when estimating the flow rate during operation of the pump, the receiving unit that receives data transmitted from the transmitting unit A flow rate estimator for estimating a flow rate or an integrated flow rate from the relationship, and whether the current value or power value measured in the flow rate estimation of the pump is within the range of the current value or power value set in the correspondence relationship. A server device having a determining device for determining;
A pump flow rate estimation apparatus comprising: