CN2634442Y - Intelligent vortex flow meter - Google Patents
Intelligent vortex flow meter Download PDFInfo
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- CN2634442Y CN2634442Y CN 03256097 CN03256097U CN2634442Y CN 2634442 Y CN2634442 Y CN 2634442Y CN 03256097 CN03256097 CN 03256097 CN 03256097 U CN03256097 U CN 03256097U CN 2634442 Y CN2634442 Y CN 2634442Y
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Abstract
The utility model relates to an intelligent turbine flowmeter integrated by sensor technology, imbedded singlechip technology and control technology. The utility model comprises an input circuit 1 of the turbine flowmeter and a signal processing circuit 5 of the singlechip which is connected with the input circuit of the turbine flowmeter; the output end of the signal processing circuit of the singlechip is connected with an two-wire 4 milliamperes to 20 milliamperes output circuit 5, the other output end is connected with a HART protocol circuit; a HART protocol input isolating and buffer circuit 4 is arranged between the signal input end of the HART protocol circuit and the two-wire 4 milliamperes to 20 milliamperes output circuit, and a HART protocol output isolating and buffer circuit 2 is arranged between the signal output end of the HART protocol circuit and the two-wire 4 milliamperes to 20 milliamperes output circuit. Therefore, the utility model has the advantages of reasonable design, simple structure and stable and safe operation; the effective isolation and buffer of the HART protocol part 3 and the external circuit can improve the reliability and increase the service life of the meter.
Description
Technical field
The utility model relates to a kind of flowmeter, especially relates to a kind of intelligent turbo flow meter that collects sensor technology, embedded scm technology and control technology and one.
Background technology
Turbo flow meter is the principal item of vane-wheel type flowmeter, up to last century end, has just formed the intelligent turbo flow meter of collection sensor technology, embedded scm technology and control technology and one.But existing intelligent turbo flow meter substantially all exists certain problem, as with extraneous communication poor anti jamming capability; The output of two-wire system 4～20mA electric current can't be transmitted on a pair of cable with digital communication simultaneously, and it is various to cause connecting up etc.
For this reason, the someone has applied for a kind of intelligent monitoring gas meter, flow meter (application number: 00235799.2), include turbine sensor, intelligence control circuit and by-pass valve control, adopt temperature compensation means and pressure compensator to improve measuring accuracy; But have poor anti jamming capability, and the deficiency of deal with data accuracy, serviceable life is short, and problem such as precision is high inadequately.In actual applications, adopt the flowmeter of fieldbus (as RS485), its communications protocol part fails to carry out effective isolation and buffering with external circuit, has influenced the reliability of transmission; And be to need 4 wires basically concerning instrument itself, comprise 2 power leads and 2 communication signal lines; Concerning Long-distance Control, it is many to exist the wiring that the Data Transport Protocol mode brings, thereby causes expense big, is difficult for mass production and is difficult to problems such as popularization.
Summary of the invention
The utility model mainly is to solve existing in prior technology communications protocol part to fail to carry out effective isolation and buffering with external circuit, poor anti jamming capability, the technical matters that serviceable life is short etc.
It is many that the utility model has also solved the wiring that the Data Transport Protocol mode brings, thereby cause expense big, the technical matters that is difficult for mass production and is difficult to promote etc.
Above-mentioned technical matters of the present utility model is mainly solved by following technical proposals: comprise turbine sensor input circuit I, the single-chip microcomputer signal processing circuit V that links to each other with the turbine sensor input circuit, it is characterized in that linking to each other with two-wire system 4～20mA output circuit VI at described single-chip microcomputer signal processing circuit one output terminal, another output terminal links to each other with HART protocol circuit III, be provided with HART agreement input isolation buffer circuit I V between the signal input part of described HART protocol circuit and two-wire system 4～20mA output circuit, be provided with HART agreement output isolation buffer circuit I I between the signal output part of HART protocol circuit and two-wire system 4～20mA output circuit.
The HART communications protocol is used the frequency shift keying fsk technology, with digital signal conversion is sound signal, do numeral communication on the two-wire system that is added to turbine flux transmitter 4～20mA electric current loop, agreement has stipulated that 2200HZ represents numeral 0,1200HZ represents numeral 1, communication speed is 1200bit/s, because the mean value of these audio frequency sine waves is 0, so can transmit the analog and digital signal that is independent of each other simultaneously on 2 wires.The HART agreement has digital signal and the 4-20mA control signal advantage transmitted simultaneously of Recombinant Interferon not mutually, makes control and intelligence communication to carry out simultaneously.Give to manipulate and bring great convenience.Has maximum security.This be other communication protocols can not compare.Therefore, adopt the HART communications protocol here.
Can carry out effective isolation and buffering in order to make the communications protocol part with external circuit, improve reliability, strengthen antijamming capability, as preferably, described HART agreement input isolation buffer circuit I V has the pin 7 of operational amplifier U4B and an end of capacitor C 8 to be in series, the other end of described capacitor C 8 links to each other with HART protocol circuit III, and the pin 6 of described operational amplifier U4B links to each other with pin 7, and the pin 5 of described operational amplifier U4B links to each other with two-wire system 4～20mA output circuit.
As preferably, described HART agreement input isolation buffer circuit I I has the pin 3 of operational amplifier U4A and an end of capacitor C 5 to be in series, the other end of described capacitor C 5 links to each other with HART protocol circuit III, the pin 2 of described operational amplifier U4A links to each other with pin 1, and the pin 1 of described operational amplifier U4A links to each other with two-wire system 4～20mA output circuit.
As preferably, the negative terminal of the D1 of described two-wire system 4～20mA output circuit is connected to the pin 5 that the HART agreement is imported the operational amplifier U4B of isolation buffer circuit I V through HART RCV line, and the other end of described capacitor C 8 links to each other with the capacitor C 7 of resistance R 13 with HART protocol circuit III.
As preferably, the OTXA pin of the U3 of described HART protocol circuit III is connected to an end of the capacitor C 5 of HART agreement output isolation buffer circuit I I, and the pin 1 of described operational amplifier U4A exports the pin C3 of U2 to.
For the isolation buffer circuit is protected, as preferably, an end of described resistance R 13 links to each other with capacitor C 8, other end ground connection, and its resistance is 402K.
As preferably, described operational amplifier U4B is the TLC27L2 operational amplifier, described capacitor C 8 be the electric capacity of 470pF.
As preferably, described operational amplifier U4A is the TLC27L2 operational amplifier, described capacitor C 5 be the electric capacity of 6.8nF.
Therefore, the utlity model has following advantage: 1, reasonable in design, simple in structure, security of operation is stable; 2, HART communications protocol part III and external circuit are isolated and buffering effectively, improve Meter Reliability, have increased the serviceable life of flowmeter; 3, antijamming capability is strong, the transfer efficiency height; 4, increase the digital communication function, can support distributed real-time control system, exempted the work of independent laying communication cable, effectively reduced the control system cost, helped mass production and popularization; 5, support hand-held communication terminal, can carry out remote configuration and debugging turbo flow meter.
Description of drawings
Fig. 1 is a kind of circuit structure block diagram of the present utility model;
Fig. 2 is a kind of circuit theory diagrams of the present utility model.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: the circuit structure block diagram (see figure 1) of intelligent turbo flow meter, comprise turbine sensor input circuit I, the single-chip microcomputer signal processing circuit V that links to each other with the turbine sensor input circuit, link to each other with two-wire system 4～20mA output circuit VI at described single-chip microcomputer signal processing circuit one output terminal, another output terminal links to each other with HART protocol circuit III, be provided with HART agreement input isolation buffer circuit I V between the signal input part of described HART protocol circuit and two-wire system 4～20mA output circuit, be provided with HART agreement output isolation buffer circuit I I between the signal output part of HART protocol circuit and two-wire system 4～20mA output circuit.Wherein, I is the turbine sensor input circuit; II is HART agreement output isolation buffer circuit; III is the HART protocol circuit; IV is HART agreement input isolation buffer circuit; V is the single-chip microcomputer signal processing circuit; VI is two-wire system 4～20mA output circuit.
Interconnected relationship (see figure 2) between each circuit structure inside and each circuit structure, the pin OTXA of U3 is connected to an end of capacitor C 5, the other end of capacitor C 5 links to each other with the pin 3 of operational amplifier U4A, the pin 2 of operational amplifier U4A links to each other with pin 1, and the pin 1 of operational amplifier U4A exports the C3 pin of U2 to; On the other hand, the negative terminal of D1 is connected to the pin 5 of operational amplifier U4B through the HART_RCV line, the pin 6 of operational amplifier U4B links to each other with pin 7, the pin 7 of operational amplifier U4B outputs to an end of capacitor C 8, the other end of capacitor C 8 links to each other with capacitor C 7 with resistance R 13, the other end ground connection of resistance R 13.Wherein U1 is PIC18F452 (44); U2 is AD421; U3 is 20C15; Operational amplifier U4B is the TLC27L2 operational amplifier; Capacitor C 8 is the electric capacity of 470pF; Operational amplifier U4A is the TLC27L2 operational amplifier; Capacitor C 5 is the electric capacity of 6.8nF; The resistance of resistance R 13 is 402K.
The principle of work work of this intelligent turbo flow meter and the each several part course of work: the tested gas that enters instrument, baffle through cross-sectional constriction quickens, act on the turbo blade then, after multi-stage gear slows down, in detected pulse signal (frequency) the input turbo flow meter circuit, carry out flow rate calculation.
Computing formula is:
Q＝Fr/coe
Wherein: Q represents flow; Fr represents frequency; COE represents instrument coefficient.
I part turbine sensor input circuit, be input to the input pickup J1 end of I when pulse signal after, behind the amplification and rectification circuit of forming by resistance R 1, resistance R 2, resistance R 3, resistance R 4, triode T1 and capacitor C 1, be input to the U1 single-chip microcomputer RA4/TOCKI end among the V.
V part single chip circuit, the pulse that I partly exports is carried out the pulse accumulation by single-chip microcomputer, the flow computing, show by LCD display, link to each other with LATHCH, CLOCK, the DATA of U2 chip among the VI respectively by RD1/PSP1, RD3/PSP3, RD5/PSP5 on the one hand, output signal is controlled 4～20mA electric current; The RC4/SDI/SDA of U1, RC5/SDO, RC6/TX/CK, RC7/RX/DT link to each other with OCD, INRTS, ITXD, the ORXD of U3 chip among the III respectively on the other hand, carry out the communication of HART agreement.
VI partly has three functions, and external on the one hand power supply 24V introduces through the pin 1 of J3, produces the required working power+3.3V of entire circuit by T2 and U2; On the other hand, receive the control signal of U1 single-chip microcomputer, the pin LOOP RTN by U2 will export 2 ends of 4～20mA electric current to power supply line J3; On the one hand the negative terminal by D1 is connected to operational amplifier U4B pin of chip 5 among the IV through HART RCV line again; to represent the modulation signal of the 2200HZ/1200HZ of digital signaling zero/1 to pass through operational amplifier U4B isolation buffer; U3 and U1 element that protection is crucial; VI also receives the pin C3 of the modulation signal of the 1200HZ/2200HZ that is exported by II to U2, is modulated on two lines of 24V of the outer confession of J3 by LOOP RTN pin at last.
The II part, i.e. HART agreement output isolation buffer circuit.Because operational amplifier U4A has been connected into a follow circuit, the sine wave signal of the 1200HZ/2200HZ of U3 output, by the output of operational amplifier U4A buffering, is isolated HART agreement output signal after the coupling of orthogonal stream effectively through capacitor C 5.
IV:HART agreement input isolation buffer circuit.Because operational amplifier U4B has been connected into a follow circuit, after the 1 end input of external power supply J3, be input to the pin 5 of operational amplifier U4B through the HART_RCV line by the negative terminal of D1, the pin 7 of operational amplifier U4B links to each other with an end of capacitor C 8, the other end of capacitor C 8 links to each other with an end of resistance R 13, capacitor C 7, the sine wave signal of 1200HZ/2200HZ of HART agreement regulation that act as outside input is after operational amplifier U4B buffering, isolate decay by capacitor C 8, resistance R 13 again, HART agreement input signal is isolated effectively.
Claims (10)
1. intelligent turbo flow meter, comprise turbine sensor input circuit (I), the single-chip microcomputer signal processing circuit (V) that links to each other with the turbine sensor input circuit, it is characterized in that linking to each other with two-wire system 4～20mA output circuit (VI) at described single-chip microcomputer signal processing circuit one output terminal, another output terminal links to each other with HART protocol circuit (III), be provided with HART agreement input isolation buffer circuit (IV) between the signal input part of described HART protocol circuit and two-wire system 4～20mA output circuit, be provided with HART agreement output isolation buffer circuit (II) between the signal output part of HART protocol circuit and two-wire system 4～20mA output circuit.
2. intelligent turbo flow meter according to claim 1, it is characterized in that having the pin 7 of operational amplifier U4B and an end of capacitor C 8 to be in series at described HART agreement input isolation buffer circuit (IV), the other end of described capacitor C 8 links to each other with HART protocol circuit (III), the pin 6 of described operational amplifier U4B links to each other with pin 7, and the pin 5 of described operational amplifier U4B links to each other with two-wire system 4～20mA output circuit.
3. intelligent turbo flow meter according to claim 1, it is characterized in that having the pin 3 of operational amplifier U4A and an end of capacitor C 5 to be in series at described HART agreement input isolation buffer circuit (II), the other end of described capacitor C 5 links to each other with HART protocol circuit (III), the pin 2 of described operational amplifier U4A links to each other with pin 1, and the pin 1 of described operational amplifier U4A links to each other with two-wire system 4～20mA output circuit.
4. according to claim 1 or 2 or 3 described intelligent turbo flow meters, it is characterized in that being connected to the pin 5 of the operational amplifier U4B of HART agreement input isolation buffer circuit (IV) at the negative terminal of the D1 of described two-wire system 4～20mA output circuit through the HART_RCV line, the other end of described capacitor C 8 links to each other with the capacitor C 7 of resistance R 13 with HART protocol circuit (III).
5. according to claim 1 or 2 or 3 described intelligent turbo flow meters, it is characterized in that being connected at the OTXA pin of the U3 of described HART protocol circuit (III) end of the capacitor C 5 of HART agreement output isolation buffer circuit (II), the pin 1 of described operational amplifier U4A exports the pin C3 of U2 to.
6. according to the described intelligent turbo flow meter of claim 4, it is characterized in that being connected at the pin OTXA of the U3 of described HART protocol circuit (III) end of the capacitor C 5 of HART agreement output isolation buffer circuit (II), the pin 1 of operational amplifier U4A exports the pin C3 of U2 to.
7. according to claim 1 or 2 or 3 described intelligent turbo flow meters, it is characterized in that linking to each other with capacitor C 8 at an end of described resistance R 13, other end ground connection, its resistance is 402K.
8. according to the described intelligent turbo flow meter of claim 4, it is characterized in that linking to each other with capacitor C 8 at an end of described resistance R 13, other end ground connection, its resistance is 402K.
9. according to claim 1 or 2 or 3 described intelligent turbo flow meters, it is characterized in that at described operational amplifier U4B be the TLC27L2 operational amplifier, described capacitor C 8 is the electric capacity of 470pF.
10. according to claim 1 or 2 or 3 described intelligent turbo flow meters, it is characterized in that at described operational amplifier U4A be the TLC27L2 operational amplifier, described capacitor C 5 is the electric capacity of 6.8nF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03256097 CN2634442Y (en) | 2003-07-26 | 2003-07-26 | Intelligent vortex flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03256097 CN2634442Y (en) | 2003-07-26 | 2003-07-26 | Intelligent vortex flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2634442Y true CN2634442Y (en) | 2004-08-18 |
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ID=34295280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03256097 Expired - Fee Related CN2634442Y (en) | 2003-07-26 | 2003-07-26 | Intelligent vortex flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2634442Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564530A (en) * | 2011-12-12 | 2012-07-11 | 西安福安创意咨询有限责任公司 | Intelligent two-wire photoelectric level transmitter with current ranging from 4mA to 20mA |
| CN110672164A (en) * | 2019-10-09 | 2020-01-10 | 东台市竹林高科技材料有限公司 | Gas turbine flowmeter and use method thereof |
-
2003
- 2003-07-26 CN CN 03256097 patent/CN2634442Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564530A (en) * | 2011-12-12 | 2012-07-11 | 西安福安创意咨询有限责任公司 | Intelligent two-wire photoelectric level transmitter with current ranging from 4mA to 20mA |
| CN102564530B (en) * | 2011-12-12 | 2017-09-29 | 河北珠峰仪器仪表设备有限公司 | A kind of intelligence 4~20mA two-wire system photoelectricity level transmitters |
| CN110672164A (en) * | 2019-10-09 | 2020-01-10 | 东台市竹林高科技材料有限公司 | Gas turbine flowmeter and use method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040818 Termination date: 20110726 |