CN2204341Y

CN2204341Y - Testing table for submersible electric pump

Info

Publication number: CN2204341Y
Application number: CN 94208782
Authority: CN
Inventors: 蒋贵跃; 荣伟国; 余樟根
Original assignee: HANGZHOU ENVIRONMENTAL PROTECTION INST COAL SCIENTIFIC RESEARCH GENERAL INST
Current assignee: HANGZHOU ENVIRONMENTAL PROTECTION INST COAL SCIENTIFIC RESEARCH GENERAL INST
Priority date: 1994-04-12
Filing date: 1994-04-12
Publication date: 1995-08-02
Anticipated expiration: 2004-04-12

Abstract

The utility model relates to a testing table for submerged electric pumps, and an outlet pressure sensor, a flow rate sensor, a rotary speed sensor, and a power sensor are respectively installed on a pump. Each sensor is connected with the corresponding circuits of the testing table for electric pumps and then is input into a microcomputer. According to the types of the sensor signals, two paths are designed. One path is formed by that the pump outlet pressure sensor and the power sensor output current signals, the current signals are output by passing through a current /voltage converting circuit and a filter circuit to an alternative switch and then are input in the microcomputer; the other path is formed by that the flow rate sensor and the rotary speed sensor output frequency signals, and the frequency signals are output by passing through a wave filtering amplitude isolating circuit, a shaping circuit and a photoelectric isolating circuit to another alternative switch and then are input in the microcomputer for processing. The utility model can test the pump performance automatically, exactly and rapidly.

Description

Testing table for submersible electric pump

The utility model belongs to the water pump testing apparatus, is specially adapted to the Submerged Motor Pumps testing property.

The electric pump parameter testing, usually adopt conventional instruments such as water meter, pressure gauge, ammeter, voltmeter, survey respectively by the tester and to read various initial data, then data analysis is accepted or rejected, and calculate performance parameter with formula, the shortcoming of this conventional test methodologies be take a lot of work, time-consuming, and artificial survey read, error of calculations is bigger, thereby testing precision is lower.

The utility model will overcome the deficiencies in the prior art, and a kind of Submerged Motor Pumps test bench is provided, and reaches the purpose of fast, accurately measuring the electric pump performance parameter automatically.

The technical pattern scheme: difference installation outlet pressure transducer, flow transducer, speed probe and power sensor on pump, each sensor is connected with the related circuit of electric pump test bench.The signal of each sensor impression is imported and is imported microcomputer sampling, internal memory after each related circuit converts electrical signal to during test, passes through signal digital filtering, analysis, processing, calculating again after demonstration of interface numeral and printing.

Divide the two-way design by the sensor signal type.One the tunnel is outlet pressure sensor and power sensor and institute's connection circuit composition thereof.These two sensor outputs are electric current (mA) signal.Sensor signal output connects A, B two ends, and A, B two ends connect current/voltage-converted circuit of being made up of resistance and the low-pass filter circuit that is combined into by resistance capacitance again, and its output terminal C connects either-or switch, inserts microcomputer then; Another road is flow transducer and speed probe and connecting circuit composition thereof, this road sensor signal is the frequency pulse signal, be connected on D, E two ends respectively, two ends output connects the filtering be made up of resistance, electric capacity every width of cloth circuit and shaping circuit, the comparator that shaping circuit is made up of operational amplifier constitutes, shaping circuit is connected again with by the synthetic photoelectric isolating circuit of optoelectronic isolator and resistor group, and its output terminal F connects another either-or switch, then inserts microcomputer.

The utility model advantage:

Pressure signal and power signal convert current signal to voltage signal through the current/voltage-converted circuit respectively, again input microcomputer processing after the eliminator lower pass-filter is removed interference; And flux signal becomes the standard square signal with the frequency pulse signal conversion that tach signal is sent sensor every width of cloth circuit and shaping circuit through filtering respectively, by importing microcomputer processing behind the photoelectric isolating circuit eliminating disturbing factor.Can realize the test automation of dispatching from the factory of on-line measurement of Submerged Motor Pumps performance parameter or electric pump.Adopt microcomputer processing, reliablely and stablely carry out automatic, quick, high-precision measuring technical data required for the pump, can directly show test data, and can draw the relation curve of flow, power, efficient three and lift respectively.This product adopts bench-top configuration, and compact structure is attractive in appearance, and is easy to use.

Embodiment with reference to the description of drawings scheme.

Fig. 1 is current/voltage-converted circuit and eliminator figure;

Fig. 2 is frequency conversion standard circuit and square-wave figure;

Fig. 3 is the utility model profile schematic representation.

Shown in Figure 1, in current/voltage-converted circuit 1, AB two ends shunt resistor R ₁, converting the current signal of sensor output to behind voltage signal input filter circuit 2, eliminator is by resistance capacitance R ₂C ₁Composition forms, connecting resistance R ₂, shunt capacitance C ₁, carry out lower pass-filter, by C termination either-or switch, another termination microcomputer interface of switch, current/voltage-converted circuit and eliminator all have grounding end; Shown in Figure 2, the pulse signal input filtering at DE two ends is every width of cloth circuit 3, and D holds series capacitance C ₂And resistance R ₃, DE two ends shunt resistor R ₄, C wherein ₂Be used as every straight filtering, R ₃R ₄Combination is as amplitude limit, and filtering connects shaping circuit 4 every width of cloth circuit, and the comparator of shaping circuit is amplifier IC ₁, shaping circuit connects photoelectric isolating circuit 5, with resistance R ₅Connect optoelectronic isolator IC ₂Respectively with resistance R ₅, R ₆Connect, output terminal F connects another either-or switch, another termination microcomputer of switch.Resistance R ₅Play metering function, resistance R ₆Be optoelectronic isolator transistor collector resistance.Filtering is every width of cloth circuit 3, shaping circuit 4 and photoelectric isolating circuit 5 ground connection all.

As shown in Figure 3, power supply tutorial light 7, single phase poaer supply tutorial light 8, three phase mains tutorial light 9, computer power tutorial light 10, single-phase voltage table 11, ammeter 12, three-phase voltage table 13, flow demonstration 14, lift demonstration 15, rotating speed demonstration 16, power demonstration 17, test bench power switch 18, microcomputer diverter switch 22, computer power switch 23, throw over switch 19,20,21,24,25,26, printing paper outlet 27 and drawer 28 are housed respectively on test bench housing 6.

Sensor type can adopt: pressure transducer is that YYB type series strain type pressure transmitter, flow transducer are LW type turbine flux transmitter; Speed probe is that SFT type, power sensor are FS-44 type list (three-phase) power transducer.

Printer adopts the PP-40 Chinese character printer.

Microcomputer adopts 8031 single chip microcomputers.Under microcomputer CPU control, carry out the automatic on-line test by program curing memory EPROM27128, two paths of signals is by 8031 microcomputer P ₁Mouth is controlled two either-or switch respectively, and the signal of switch input is introduced into the A/D(D/A) transducer, interrupt application then, microcomputer allows to interrupt data and passes through P ₀Mouth deposits data memory RAM6116 in; Standard square signal and 8031 microcomputers by another either-or switch input

End connects, device when utilizing the property settings of 8031 gate position GATE.When the gate position is 1, make the enabling counting of timer influenced by outside incoming level, can survey square width, deposit among the data memory RSM6116.Microcomputer carries out digital filtering, analysis, calculating then, shows flows, lift, rotating speed, power by eight common cathode display devices, and prints the efficiency value that demonstration amount and computer calculation get pump by printer PP-40, finally draws out various performance curves.

Claims

1, a kind of Submerged Motor Pumps test bench, be the equipment of measuring performance parameters such as electric pump flow, rotating speed, power and outlet pressure, the measurement signal that it is characterized in that being contained in each the sensor impression on the pump converts electrical signal to by related circuit, input microcomputer sampling, internal memory and digital filtering, analysis, processing calculating are after the interface circuit output data shows and print that its circuit and electronic device annexation are as follows:

(1) current/voltage-converted circuit [1]:

By AB two ends shunt resistor R ₁Form, convert AB two ends output current signal to voltage signal;

(2) eliminator [2]:

It is connected with current/voltage-converted circuit [1], wherein is connected to resistance R ₂And capacitor C ₁, by resistance capacitance combination R ₂C ₁Form lower pass-filter,, connect microcomputer interface then by C termination either-or switch;

(3) filtering is every width of cloth circuit [3]:

DE two ends pulse signal inserts filtering every width of cloth circuit [3], from D end series capacitance C ₂And resistance R ₃, shunt resistor R ₄

(4) shaping circuit [4]:

Connection filtering is shaping circuit [4] every width of cloth circuit [3], and it is by operational amplifier IC ₁Form;

(5) photoelectric isolating circuit [5]:

What be connected with shaping circuit [4] is photoelectric isolating circuit [5], and it has optoelectronic isolator IC ₂, difference connecting resistance R ₅And R ₆, R ₅Another termination shaping circuit, output terminal F connects the another either-or switch, is input into microcomputer then;

(6) the equal ground connection of above-mentioned each circuit.

2, Submerged Motor Pumps test bench according to claim 1 is characterized in that microcomputer adopts 8031 single chip microcomputers.

3, Submerged Motor Pumps test bench according to claim 1 is characterized in that pressure transducer adopts YYB type series strain type pressure transmitter; Flow transducer adopts LW type turbine flux transmitter; Speed probe adopts the SFT type; Power sensor adopts FS-44 type list (three-phase) power transducer.

4, Submerged Motor Pumps test bench according to claim 1, it is characterized in that adopting bench-top configuration, power supply tutorial light ［ 7 ］ is housed respectively on the test bench housing ［ 6 ］, single phase poaer supply tutorial light ［ 8 ］, three phase mains tutorial light ［ 9 ］, computer power tutorial light ［ 10 ］, single-phase voltage table ［ 11 ］, ammeter ［ 12 ］, three-phase voltage table ［ 13 ］, flow shows ［ 14 ］, lift shows ［ 15 ］, rotating speed shows ［ 16 ］, power shows ［ 17 ］, test bench power switch ［ 18 ］, microcomputer diverter switch ［ 22 ］, computer power switch ［ 23 ］, throw over switch ［ 19 ］, ［ 20 ］, ［ 21 ］, ［ 24 ］, ［ 25 ］, ［ 26 ］, printing paper outlet ［ 27 ］ and drawer ［ 28 ］.