CN207115109U

CN207115109U - A kind of flow integrator based on PIC single chip microcomputer

Info

Publication number: CN207115109U
Application number: CN201720989552.9U
Authority: CN
Inventors: 秦萍
Original assignee: Ningxia Industry And Commerce Career Technical College (ningxia Chemical Engineering School Ningxia Mechanical And Electrical Engineering School Ningxia Agricultural Mechanization School)
Current assignee: Ningxia Industry And Commerce Career Technical College (ningxia Chemical Engineering School Ningxia Mechanical And Electrical Engineering School Ningxia Agricultural Mechanization School)
Priority date: 2017-08-09
Filing date: 2017-08-09
Publication date: 2018-03-16
Anticipated expiration: 2027-08-09

Abstract

The utility model belongs to flow measurement instrument field, is related to a kind of flow integrator based on PIC single chip microcomputer.The flow integrator, including PIC single chip microcomputer, analog input end, a/d converter, power output end, analog signal output circuit, recorder, power-down protection circuit, decoder, display, serial communication interface, printer, key panel, Switching Power Supply and pick-up output end, analog input end is connected by a/d converter with PIC single chip microcomputer, PIC single chip microcomputer is connected with power output end respectively, it is connected by analog signal output circuit with recorder, it is connected with power-down protection circuit, it is connected by decoder with display, it is connected with display, it is connected by serial communication interface with printer, it is connected with pick-up output end, key panel and Switching Power Supply are connected with PIC single chip microcomputer respectively.Using this flow integrator, circuit design is simpler, and measuring accuracy is higher, and operating voltage range is wider, can be supporting with various flow rate meter, and accuracy class can reach 0.2%FS.

Description

A kind of flow integrator based on PIC single chip microcomputer

Technical field

The utility model belongs to flow measurement instrument field, is related to a kind of flow integrator based on PIC single chip microcomputer.

Background technology

With the development of industrial technology, to the precise requirements of flow measurement also more and more higher, accurate measurement is not required nothing more than Medium volume flow, while require to measure mass of medium flow, heat flow.Because flow not only has with the volume flow in pipeline Close, and there are much relations with the temperature in pipeline, pressure, therefore, for a long time, the accurate metering of flow is always that industry is raw The emphasis and difficult point in process control are produced, especially constantly changes, adds in the industries such as oil, chemical industry, live temperature, pressure The accuracy of flow measurement.Therefore, the flow after accurate measurement temperature pressure compensation seems even more important.

Now widely used flowmeter species is various, and the medium of measurement includes various liquid, gas, saturated vapor, mistake Vapours etc., in order to realize the accurate metering of flow, in addition to selecting suitable flowmeter, also need to be equipped with the flow of excellent performance Integrating instrument, the various detection signals in scene are received, realize that the temperature to flow measurement, pressure compensate, meanwhile, it can be flowed Amount display, accumulation integrating, controlling alarm and communication etc..Existing flow integrator is commonly present problems with：Using common power, So that operating voltage range is narrower, generally 220V ± 10%；The single-chip microcomputer used is 51 series monolithics, programming instruction number More, programmed method complexity；Matching used flow meter type is limited；Parameter setting confidentiality is not high enough；The temperature that can receive, Pressure sensor types are less；Measuring accuracy is relatively low, generally 0.5%FS.Accordingly, it is desirable to provide one kind can effectively overcome with The flow integrator of upper problem, more it is applicable the demand of relevant industries.

The content of the invention

The purpose of this utility model is to provide a kind of flow integrator based on PIC single chip microcomputer, and circuit design is simple, meter It is high to calculate precision, operating voltage range is wide, suitable commercial Application.

The utility model solve above-mentioned technical problem technical scheme be：

A kind of flow integrator based on PIC single chip microcomputer, including PIC single chip microcomputer, analog input end, a/d converter, electricity Source output terminal, analog signal output circuit, recorder, power-down protection circuit, decoder, display, serial communication interface, printing Machine, key panel, Switching Power Supply and pick-up output end；Analog input end is connected by a/d converter with PIC single chip microcomputer, by mould The analog signal transmission of analog quantity input is to a/d converter, then is converted into data signal by a/d converter and transmits mono- to PIC Piece machine, PIC single chip microcomputer are connected with power output end, and for being powered to transmitter, PIC single chip microcomputer passes through analog signal output circuit It is connected with recorder, the analog signal that PIC single chip microcomputer exports by analog signal output circuit transmission to recorder and is driven Recorder, PIC single chip microcomputer are connected with power-down protection circuit, and the power supply output valve of PIC single chip microcomputer is transmitted to power-down protection circuit, Feed back to PIC single chip microcomputer again after power-down protection circuit is handled, PIC single chip microcomputer is connected by decoder with display, by PIC The code of single-chip microcomputer output is converted to data signal by decoder and is delivered to display, and PIC single chip microcomputer is connected with display, The parameter of PIC single chip microcomputer is shown by display, PIC single chip microcomputer is connected by serial communication interface with printer, is used In timed print parameter and flow value, PIC single chip microcomputer is connected with pick-up output end, and the current value of PIC single chip microcomputer is transmitted to change Output end is sent, the push button signalling output end of key panel and the push button signalling input of PIC single chip microcomputer are connected, joined for setting Number, the power output end of Switching Power Supply and the power input of PIC single chip microcomputer connect, for being powered to PIC single chip microcomputer.

The flow integrator, PIC single chip microcomputer are PIC6F877 single-chip microcomputers, and analog input end includes processes temperature signal electricity Road, pressure signal processing circuit and flow signal process circuit, a/d converter are 14 bit A/D converters, and display shows for charactron Show device, pick-up output end is 4mA~20mA pick-up output ends.

Using the utility model having the beneficial effect that based on PIC single chip microcomputer flow integrator, employ high performance PIC16F877 single-chip microcomputers, circuit design are simpler；The high-precision AD converter of 14 is employed, measuring accuracy is higher；Using Switching Power Supply, operating voltage range are wider；Analog input end including multi-signal process circuit, can be with various flow rate meter It is supporting, and various temperature, pressure, flow sensor and transducer signal can be received；Can using the accuracy class of this integrating instrument Reach 0.2%FS.

Brief description of the drawings

Fig. 1 is integrated circuit block diagram of the utility model based on PIC single chip microcomputer flow integrator；

Fig. 2 is workflow diagram of the utility model based on PIC single chip microcomputer flow integrator.

Coding in accompanying drawing is respectively：1 is PIC single chip microcomputer, and 2 be analog input end, and 2-1 is processes temperature signal electricity Road, 2-2 are pressure signal processing circuit, and 2-3 is flow signal process circuit, and 3 be a/d converter, and 4 be power output end, and 5 are Analog signal output circuit, 6 be recorder, and 7 be power-down protection circuit, and 8 be decoder, and 9 be display, and 10 connect for serial communication Mouthful, 11 be printer, and 12 be key panel, and 13 be Switching Power Supply, and 14 be pick-up output end.

Embodiment

As shown in figure 1, a kind of flow integrator based on PIC single chip microcomputer, including PIC single chip microcomputer 1, analog input end 2, A/d converter 3, power output end 4, analog signal output circuit 5, recorder 6, power-down protection circuit 7, decoder 8, display 9th, serial communication interface 10, printer 11, key panel 12, Switching Power Supply 13 and pick-up output end 14, PIC single chip microcomputer 1 are PIC16F877 single-chip microcomputers, analog input end 2 include processes temperature signal circuit 2-1, pressure signal processing circuit 2-2 and stream Signal processing circuit 2-3 is measured, a/d converter 3 is 14 high-precision AD converters, and display 9 is numeral method device, and pick-up is defeated It is 4mA~20mA pick-up output ends to go out end 14；Analog input end 2 is connected by a/d converter 3 with PIC single chip microcomputer 1, will be simulated The analog signal transmission of input 2 is measured to a/d converter 3, then data signal is converted into by a/d converter 3 and transmitted mono- to PIC Piece machine 1, PIC single chip microcomputer 1 are connected with power output end 4, and for being powered to transmitter, PIC single chip microcomputer 1 passes through analog signal output Circuit 5 is connected with recorder 6, and the analog signal that PIC single chip microcomputer 1 exports is transmitted to record by analog signal output circuit 5 Instrument 6 simultaneously drives recorder 6, and PIC single chip microcomputer 1 is connected with power-down protection circuit 7, by the power supply output valve of PIC single chip microcomputer 1 transmit to Power-down protection circuit 7, PIC single chip microcomputer 1 is fed back to again after the processing of power-down protection circuit 7, PIC single chip microcomputer 1 passes through decoder 8 It is connected with display 9, the code that PIC single chip microcomputer 1 exports is converted into data signal by decoder 8 and is delivered to display 9, PIC single chip microcomputer 1 is connected with display 9, the parameter of PIC single chip microcomputer 1 is shown by display 9, PIC single chip microcomputer 1 passes through Serial communication interface 10 is connected with printer 11, for timed print parameter and flow value, PIC single chip microcomputer 1 and pick-up output end 14 connections, the current value of PIC single chip microcomputer 1 is transmitted to pick-up output end 14, the push button signalling output end and PIC of key panel 12 The push button signalling input connection of single-chip microcomputer 1, for arrange parameter, power output end and the PIC single chip microcomputer 1 of Switching Power Supply 13 Power input connects, for being powered to PIC single chip microcomputer 1.

As shown in Fig. 2 workflow of the utility model based on PIC single chip microcomputer flow integrator is, after starting, carry out just Beginningization and system parameter setting, determine whether that button is pressed, if there is button to press, open keyboard service routine, go forward side by side One step carries out data sampling, processing, if being pressed without button, directly carries out data sampling, processing, will sample, the number after processing According to by showing that program is shown, judge whether to need to print, if desired print, then directly print, after printing terminates, return to Initialization and system parameter setting stage, if without printing, it is returned directly to initialization, system parameter setting stage.

During being run using this flow integrator, including the processing of processes temperature signal circuit 2-1, pressure signal Circuit 2-2 and flow signal process circuit 2-3 analog input end 2, can be with turbine flowmeter, vortex-shedding meter, V-arrangement coning tower tray The various flow rate meter such as gauge, electromagnetic flowmeter, orifice flowmeter is supporting, meanwhile, 4~20mA, 1~5V, standard hot can be received Various temperature, pressure, flow sensor and the transducer signals such as resistance (Pt100), 0~2000Hz frequency signals；PIC single chip microcomputer 1 is PIC16F877 single-chip microcomputers, can carry out volume flow to various gases, saturated vapor, superheated steam, liquid and other medium flow Measurement, according to the temperature at scene, pressure sensor measurement signal, carry out Temperature and Pressure Correction, accurate measurement mass flow or mark Quasi- volume flow, meanwhile, trip temperature, pressure, flow transmitter bound can be entered and set, flow-compensated mode sets, the time and Printing gap is set, and realizes timed print items on-site parameters and integrated flux, also settable parameter setting function of cipher lock, is prevented Only arrange parameter is arbitrarily changed, and when temperature, pressure, flow are prescribed a time limit more than setting, has warning output function, can also be according to stream The measurement range of gauge carries out small-signal excision ratio setting, improves the accuracy of measurement；Power output end 4 is provided with, band is straight The output of 24V power supplys is flowed, the transmitter power supply at scene can be given；Power-down protection circuit 7 is provided with, possesses power-down protection, when When power down occurs for flow integrator, the information such as arrange parameter and integrated flux will not lose；Temperature is shown by display 9 at the scene Flow, integrated flux after degree, pressure, flow and compensation；It is provided with Switching Power Supply 13 to power for PIC single chip microcomputer 1, realizes 85V~265V AC wide operating voltage ranges；Pick-up output end 14 is provided with, band 4mA~20mA compensating flowrate outputs, can be driven The equipment such as dynamic recorder.

Claims

1. a kind of flow integrator based on PIC single chip microcomputer, it is characterised in that including PIC single chip microcomputer (1), analog input end (2), a/d converter (3), power output end (4), analog signal output circuit (5), recorder (6), power-down protection circuit (7), Decoder (8), display (9), serial communication interface (10), printer (11), key panel (12), Switching Power Supply (13) and change Send output end (14)；

The analog input end (2) is connected by a/d converter (3) with PIC single chip microcomputer (1), by analog input end (2) Analog signal transmission is to a/d converter (3), then is converted into data signal by a/d converter (3) and transmits to PIC single chip microcomputer (1)；

The PIC single chip microcomputer (1) is connected with power output end (4), for being powered to transmitter；

The PIC single chip microcomputer (1) is connected by analog signal output circuit (5) with recorder (6), and PIC single chip microcomputer (1) is exported Analog signal transmitted by analog signal output circuit (5) to recorder (6) and drive recorder (6)；

The PIC single chip microcomputer (1) is connected with power-down protection circuit (7), and the power supply output valve of PIC single chip microcomputer (1) is transmitted to falling Electric protection circuit (7), PIC single chip microcomputer (1) is fed back to again after power-down protection circuit (7) processing；

The PIC single chip microcomputer (1) is connected by decoder (8) with display (9), and the code that PIC single chip microcomputer (1) exports is passed through Decoder (8) is converted to data signal and is delivered to display (9)；

The PIC single chip microcomputer (1) is connected with display (9), and the parameter of PIC single chip microcomputer (1) is shown by display (9) Show；

The PIC single chip microcomputer (1) is connected by serial communication interface (10) with printer (11), for timed print parameter and stream Value；

The PIC single chip microcomputer (1) is connected with pick-up output end (14), and the current value of PIC single chip microcomputer (1) is transmitted to pick-up and exported Hold (14)；

The push button signalling output end of the key panel (12) is connected with the push button signalling input of PIC single chip microcomputer (1), for setting Put parameter；

The power output end of the Switching Power Supply (13) is connected with the power input of PIC single chip microcomputer (1), for giving PIC monolithics Machine (1) is powered.

A kind of 2. flow integrator based on PIC single chip microcomputer as claimed in claim 1, it is characterised in that the PIC single chip microcomputer (1) it is PIC16F877 single-chip microcomputers.

3. a kind of flow integrator based on PIC single chip microcomputer as claimed in claim 1, it is characterised in that the analog quantity is defeated Entering end (2) includes processes temperature signal circuit (2-1), pressure signal processing circuit (2-2) and flow signal process circuit (2- 3)。

A kind of 4. flow integrator based on PIC single chip microcomputer as claimed in claim 1, it is characterised in that the a/d converter (3) it is 14 bit A/D converters.

A kind of 5. flow integrator based on PIC single chip microcomputer as claimed in claim 1, it is characterised in that the display (9) For numeral method device.

A kind of 6. flow integrator based on PIC single chip microcomputer as claimed in claim 1, it is characterised in that the pick-up output It is 4mA~20mA pick-up output ends to hold (14).