CN111854894A

CN111854894A - Flowmeter calibrating device of precision weighing method

Info

Publication number: CN111854894A
Application number: CN202010657980.8A
Authority: CN
Inventors: 樊响
Original assignee: Changchun University of Science and Technology
Current assignee: Changchun University of Science and Technology
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2020-10-30

Abstract

A flowmeter calibrating device of a precision weighing method comprises: the slave computer calculates according to the measured unit pulse number and the nominal unit pulse number of the flowmeter to be calibrated to obtain a calibration coefficient, writes the calibration coefficient into a built-in chip on the flowmeter, and a built-in chip running program calibrates the measured unit pulse number so as to improve the consistency and the precision quality of the product batch quality of the flowmeter and eliminate systematic errors among flowmeter products. In this way: good effect, high speed and automation realization.

Description

Flowmeter calibrating device of precision weighing method

Technical Field

The invention relates to the technical field of flowmeter measurement and the field of intelligent instruments, in particular to a flowmeter calibrating device.

Background

In the information age of internet of things, flowmeters are widely used in charging and billing systems, such as: intelligent water meter, fee-charging drinking machine, etc. The flow meter for charging has high precision requirement, and the high-precision flow meter on the market is very expensive. In order to reduce the manufacturing cost of the flow meter and improve the precision, the precision error between the flow meters needs to be reduced, and the problem of consistent precision of products is solved. However, in the production process of the flowmeter, the consistency and quality accuracy of the product are achieved by adopting a pure mechanical means, and the difficulty is very high.

The existing calibration methods include: volumetric, gravimetric and standard flow meter methods. Both the volumetric method and the standard flow meter method are less accurate methods. The weighing method has high precision but low efficiency. How to improve the efficiency of weighing calibration? The calibration of the weighing method is usually performed by mechanical adjustment, and therefore, the efficiency is low. The calibration method of the invention is characterized in that a singlechip is added for controlling, a calibration coefficient is calculated according to the measured unit pulse number and the nominal unit pulse number of the flowmeter to be calibrated, the calibration coefficient is written into a built-in chip on the flowmeter, and the measured unit pulse number is calibrated by a built-in chip running program. The method can reduce the product consistency precision error of the flowmeter, and has high efficiency and good effect compared with the mechanical calibration.

Disclosure of Invention

The calibration method of the flowmeter comprises the following steps: and the slave computer calculates the calibration coefficient according to the measured unit pulse number and the nominal unit pulse number of the flowmeter to be calibrated, writes the calibration coefficient into a built-in chip on the flowmeter, and calibrates the measured unit pulse number by a built-in chip running program. The method can improve the consistency precision quality of the product batch quality of the flowmeter and eliminate systematic errors among flowmeter products. In this way: good effect, high speed and automation realization.

The specific technical scheme of the invention is as follows: a flowmeter calibrating device of a precision weighing method mainly comprises a host, a slave, a plurality of measured flowmeters connected in series, a water pump, an electronic scale, an electromagnetic valve and an RF radio frequency wireless communication module, and is characterized in that: the electronic scale measures the weight of the liquid, the host machine transmits the weighing information to the slave machine through a signal wire, and the slave machine calculates the calibration coefficient of the measured flowmeter according to the measured unit pulse number and the nominal unit pulse number of the measured flowmeter; the slave computer writes the calibration coefficient into a built-in chip of the measured flowmeter, the built-in chip calibrates the error of the flowmeter through operating a program, more accurate flowmeter signals are output, and the consistency precision of flowmeter products is improved.

The host computer is connected with the water pump through a signal wire to control the flow speed, the running time, the starting and the stopping of the water pump, the host computer is communicated with the electronic scale through the signal wire to read the weighing information of the electronic scale and transmit the weighing information to each slave computer through the signal wire, each slave computer compares the actual measurement unit pulse number of the measured flowmeter read by the slave computer with the nominal unit pulse number corresponding to the weighing information, the calculated calibration coefficient is written into the built-in chip on the flowmeter through the signal wire, and when the measured flowmeter is in use, the built-in chip can run a program to calibrate the output pulse signals of the flowmeter.

The host machine is communicated with the electronic scale through the signal wire, and when the weighing process is finished, the host machine sends a signal to the RF wireless communication module on the electromagnetic valve through the RF wireless communication module to control the electromagnetic valve to be opened, so that water in the measuring cup is emptied, and the flowmeter of the next batch is calibrated conveniently.

And the water tank collects water discharged by the electromagnetic valve for the next batch of circulating water test calibration flow meter.

The water pump is controlled by the host computer and is extracted the water in the water pitcher, and the host computer adjusts the water current size that draws water of different voltage value control water pump, and the host computer can also adjust the power supply time of water pump.

The measured flow meters are connected with the slave machines through signal lines to form a calibration module, the signal lines can be connected with a plurality of slave machines, and the water pipes are used for connecting the plurality of measured flow meters in series to form a plurality of measured flow meter calibration modules.

Description of the drawings:

FIG. 1 is a schematic view of a flow meter calibrating apparatus for a precision weighing method according to the present invention;

in the present invention, the reference numerals in the attached fig. 1 of the specification respectively represent:

water tank 1 RF wireless communication module 2 signal line 3 host machine 4 signal line 5 suction pipe 6 water pump 7 outlet pipe 8 measured flow meter 9 from machine 10 measured flow meter 11 from machine 12 measured flow meter 13 from machine 14 outlet pipe 15 measuring cup 16 outlet pipe 17 RF wireless communication module 18 electromagnetic valve 19 electronic scale 20 signal line 21 signal line 22 signal line 23 signal line 24 signal line 25

The specific implementation mode is as follows:

detailed description is shown in fig. 1, the flowmeter calibrating device of the precision weighing method mainly comprises a host 4, a slave 10, a slave 12, a slave 14, a measured flowmeter 9, a measured flowmeter 11, a measured flowmeter 13, a water pump 7, an electronic scale 20, an electromagnetic valve 19 and an RF radio frequency wireless communication module 18, and is characterized in that: the slave 10, the slave 12 and the slave 14 respectively calculate the calibration coefficient of the measured flowmeter according to the measured liquid weight measured by the electronic scale and the measured unit pulse number of the measured flowmeter 9, the measured flowmeter 11 and the measured flowmeter 13 corresponding to the measured liquid weight, and the slave 10, the slave 12 and the slave 14 respectively write the calibration coefficient into the built-in chips of the measured flowmeter 9, the flowmeter 11 and the measured flowmeter 13. Each built-in chip respectively runs programs to calibrate the actual measurement unit pulse signals of the measured flowmeter 9, the measured flowmeter 11 and the measured flowmeter 13, outputs more accurate flowmeter signals and improves the consistency precision of flowmeter products.

The host machine 4 is connected with the water pump 7 through a signal line 5 to control the flow speed and the running time of the water pump 7, the host machine 4 is connected with the electronic scale 20 through a signal line 21 to read the weighing information of the electronic scale 20 and transmit the weighing information to the

slave machines

10, 12 and 14 through a signal line 22, each slave machine compares the actual unit pulse number read by the measured flowmeter 9, the measured flowmeter 11 and the measured flowmeter 13 with the nominal unit pulse number corresponding to the weighing information respectively, and writes the calibration coefficient into the built-in chips of the measured flowmeter 9, the measured flowmeter 11 and the measured flowmeter 13 through a signal line 23, a signal line 24 and a signal line 25 respectively, and when the measured flowmeter is applied, the built-in chips can calibrate the output pulse signals of the flowmeters through a running program.

The host machine 4 communicates with the electronic scale 20 through a signal line 21, and when the weighing process is finished, the host machine 4 sends a signal to the RF wireless communication module 18 on the electromagnetic valve through the RF wireless communication module 2 to control the electromagnetic valve 19 to be opened, so as to empty the water in the measuring cup 16 for the next batch of flow meter calibration.

The water tank 1 collects the water drained from the measuring cup 16 for use in the next batch of circulating water test prover.

The water pump 7 is controlled by the host 4 to pump water in the water tank, the host 4 controls the water pumping flow of the water pump 7 by outputting different voltage values, and the host 4 controls the flow by controlling the power supply time of the water pump 7.

The measured flow meter 9, the measured flow meter 11 and the measured flow meter 13 are respectively connected with the slave 10, the slave 12 and the slave 14 through a signal line 23, a signal line 24 and a signal line 25 to form a calibration module, the signal lines 22 can be used for connecting a plurality of slaves to form the calibration module, and the water pipes 8 can be used for connecting a plurality of measured flow meters in series to form a plurality of measured flow meter calibration modules.

Claims

1. A flowmeter calibrating device of a precision weighing method mainly comprises a host, a slave, a plurality of measured flowmeters connected in series, a water pump, an electronic scale and an electromagnetic valve, and is characterized in that: according to the flow measured by the weighing method, the slave computer respectively calculates the error coefficient of the measured flowmeter according to the pulse generation number of the measured flowmeter, writes the error calibration coefficient into the built-in chip of the measured flowmeter through the slave computer, calibrates and converts the pulse signal of the flowmeter through the built-in chip running program, outputs more accurate flowmeter signals and improves the consistency precision of flowmeter products.

2. The flowmeter calibrating device of a precision weighing method as claimed in claim 1, wherein the master machine is connected to the water pump through a signal line to control the flow rate and the operation time of the water pump, the master machine is connected to the electronic scale through a signal line to read the weighing information of the electronic scale and transmit the weighing information to each slave machine through a signal line, each slave machine compares the pulse signal of the measured flowmeter read by the slave machine with the weighing information through a signal line to write the calibration coefficient into the built-in chip on the flowmeter through the error of the slave machine, and the built-in chip calibrates the output pulse signal of the flowmeter through the operation program when the measured flowmeter is applied.

3. The flowmeter calibrating device of the precise weighing method as claimed in claim 2, wherein the host computer communicates with the electronic scale through a signal line, and when the weighing process is finished, the host computer sends a signal to the RF wireless communication module on the electromagnetic valve through the RF wireless communication module to control the electromagnetic valve to open, so as to empty the water in the measuring cup, thereby performing the next flowmeter calibration.

4. The flowmeter calibrating device for the precision weighing method as claimed in claim 3, wherein the water tank collects the water drained from the measuring cylinder through the solenoid valve for the next batch of circulating water test calibration flowmeters.

5. The flowmeter calibrating device for the precision weighing method as claimed in claim 4, wherein the measured flowmeter is connected to the slave machines through signal lines to form a calibrating module, the signal lines can be connected to a plurality of slave machines, and the plurality of measured flowmeters are connected in series through water pipes to form a plurality of measured flowmeter calibrating modules.