CN2227819Y

CN2227819Y - Intelligent flow performing and calculating instrument

Info

Publication number: CN2227819Y
Application number: CN 94225375
Authority: CN
Inventors: 李凤翔; 李溪婷
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-02-26
Filing date: 1994-02-26
Publication date: 1996-05-22
Anticipated expiration: 2004-02-26

Abstract

The utility model relates to a flow calculating instrument, comprising a case, a control panel and an inner control circuit, wherein, the center of the control circuit is a CPU microprocessor; the input interface comprises a temperature transmitter, a pressure difference signal input end, an input signal of a pressure sensor input end and a pulse input end; the output interface comprises an electricity output interface, a display interface and a keyboard interface. The utility model can calculate the flow of various media through microcomputer software. The utility model has the advantages of simple structure, high precision, high speed and all-around functions, being capable for calculating the flow of various media.

Description

The intelligent flow calculus instrument

The utility model belongs to a kind of flow measurement device.

It is a lot of to produce flow integrator producer at present both at home and abroad, the special throttling devices such as orifice plate that are are housed on the structure that has, what have is equipped with single-chip microcomputer in structure, mainly carry out the density compensation calculation according to the medium kind, what general utility functions was arranged is that Yiwu, Zhejiang China faces the intelligent flow meter that company produces, this instrument can be joined the pulse flow meter can join orifice plate simulation delivery rate meter again, but its weak point is an intelligent function only is computing evolution function, compensation density, can not check design to orifice plate, can not revise, change inner 16 bit keyboard of flowmeter and set systematic error, general 8 A/D and the D/A converter of adopting of circuit design, at the bottom of the precision, poor anti jamming capability, its computing only is the computing of simple function, scale operation, according to the medium kind, by certain physical formula or experimental formula density is carried out computing, as a whole, function singleness, computational accuracy is low, does not have the compensate function that computing is arranged.

For solving the deficiency of above flowmeter, the purpose of this utility model provides a kind of intelligent flow calculus instrument, utilize microcomputer to be added with temperature compensation interface, multi-way switch, frequency pulse input interface and microcomputer software and form, effectively solved the flow rate calculation problem of various media.

Structural design of the present utility model is achieved in that intelligent flow calculus instrument outside is a housing, the front is a control panel, circuit control panel is equipped with in inside, it is the rectangular body that has the forward position that display screen, warning indication, operation keyboard, housing wherein are housed above the control panel, can be contained on the various controller bezel, clusters, control circuit is that CPU microprocessor and interface output circuit four parts are formed from input circuit, interface circuit, center, wherein one the tunnel be input as multiway analog switch, the multiway analog switch input has the temperature transmitter input end; Pressure reduction input signal Δ P input end and pressure transducer pressure P input end, another road is pulse input end and warning circuit output terminal, multiway analog switch and electric voltage/frequency converter join, electric voltage/frequency converter, pulse input circuit join by photoelectrical coupler and CPU interrupting input end respectively, warning circuit joins by photoelectrical coupler and cpu address end, at CPU by interface circuit and keyboard, demonstration and mode of operation switch join, be connected to current output circuit simultaneously in CPU output, current output circuit is cpu address end D ₀～D ₇Join with programmable counter/timer, join with photoelectrical coupler by amplifying time-delay, photoelectrical coupler output connects the two-stage triode and amplifies the back with current forms output (as shown in Figure 5); The pulse input circuit front is a sensitivity adjusting, exports with square-wave pulse behind the input optocoupler after two utmost points amplify; It is that two-way is exported that warning circuit connects with CPU, respectively by the voltage signal of photoelectrical coupler output with upper limit alarm HA and lower limit warning LA; The temperature transmitter circuit is three-wire system P _T100Platinum resistance thermometer sensor, and R ₁, R ₂, R ₃Form wheatstone bridge, after amplifying, be output as the V of 0～5V _tVoltage inputs to electric voltage/frequency converter (bridge circuit needn't be passed through in E, K electricity corner in this way, directly connects amplifier output) as temperature signal.

Detailed structure of the present utility model is provided by following examples and accompanying drawing.

Fig. 1 is an intelligent flow calculus instrument shape assumption diagram;

Fig. 2 is an intelligent flow calculus instrument controlling party block diagram;

Fig. 3 is intelligent flow calculus instrument pulse input circuit figure;

Fig. 4 is intelligent flow calculus instrument multi-way switch input circuit figure;

Fig. 5 is intelligent flow calculus instrument current output circuit figure;

Fig. 6 is intelligent flow calculus instrument warning circuit figure;

Fig. 7 is intelligent flow calculus instrument electricity corner input circuit figure.Its contour structures is by shown in Figure 1, on the control panel, and 1. housing; 2. instrument deckle board; 3. control panel; 4. 6 LED display; 5. 2 LED creditor side display screens; 6. major event display screen; 7. report to the police and indicate; 8. communications status indication; 9. 8 bit keyboards; 10. power-off protection reserve battery; 11. host circuit board; 12. heat radiator; 13. power supply; 14. connection terminal; 15. printing communication interface.The controlling party block diagram as shown in Figure 2, I is a temperature transmitter, II is a multiway analog switch, and III is voltage and frequency converter, and IV is a photoelectrical coupler, V is a mu balanced circuit, VI is a pulse input circuit, and IX is a warning circuit, VII, VIII is a photoelectrical coupler, X is a functional switch, XI, XII is internal power supply and outage detection, and XIII is a CPU emblem processor, XIV, XV, XVI is for showing, keyboard and mode of operation switch, XVII is programmable counter/timer, XVIII is a current output circuit, and Fig. 3 is the pulsation input circuit, and the front is a sensitivity adjusting, amplify through secondary, isolate the input computing machine through photoelectricity again.Wherein Fig. 4 is a multi-way switch, the analog quantity input has three amounts of Δ P.P.t, and Δ P, P are pressure reduction, 0～10mA that pressure unit sends or the current signal of 4～20mA, these switching current signals convert 0～5V or 1～5V voltage signal to through input resistance R λ, are input to the A of multiway analog switch ₀B ₀And A ₁B ₁Mouthful, temperature signal (P _T100Or E, K electricity corner) temperature transmitter by gauge internal converts 0～5V V to _tVoltage signal is added to analog switch A ₃B ₃Mouthful, the switching of each signal is by the addressing signal S of multiway analog switch ₀S ₁Decision, S ₀S ₁P by CPU ₁Mouth control.Fig. 5 is a current output circuit, and the cpu data sign indicating number again through photoisolator, amplifies output with triode, for current parameters provides again after the electric voltage frequency conversion.Fig. 6 is a warning circuit, and CPU provides control signal, reports to the police through the control of photoisolator output high-low level, and Fig. 7 is the galvanic couple input circuit, W ₁Galvanic couple is imported through balanced bridge, through amplifier output, gives CPU through multi-way switch more again.The mode of operation switch and the 8255Pc of output interface join, and are four and have 16 kinds of combinations, and its state reads in by 8 255 and inputs to CPU, is used to distinguish which kind of flow sensor, and which kind of medium has strengthened the complete machine versatility greatly.The functional switch of input and CPU8301P ₁Mouth joins, and is used for the identification input, and the output simulating signal is 0～10mA, or 4～20mA is in print state or communications status setting.Strengthened the complete machine versatility.

The advantage of the utility model: simple in structure, omit some A/D and D/A converter, it The precision height, speed is fast, and function is complete, adapts to the various interface input mode, can be to rate-of flow what time Calculate.

Claims

1. intelligent flow calculus instrument, it is characterized in that this calculus instrument outside is a housing (1), the front is control panel (3), circuit control panel (11) is equipped with in inside, control circuit is that CPU microprocessor and interface output circuit four parts are formed by input circuit, interface circuit, center, wherein one the tunnel be input as multiway analog switch (II), switch (II) input end has temperature transmitter (I) input end, pressure difference signal Δ P input end, pressure transducer pressure P input end, another road are pulse input end (VI); And warning circuit output terminal (IX), multiway analog switch (II) joins with electric voltage/frequency converter (III), converter (III), pulse input circuit (VI) and warning circuit (IX) join with CPU by photoelectricity coupled circuit (IV), (VII), (VIII) respectively, center C PU (XIII) by interface and keyboard (XV), show that (XIV), mode of operation switch (XVI) CPU (XIII) output while of joining joins with current output circuit (XVII).

2. by the described calculus instrument of claim 1, it is characterized in that input end has functional switch (X) and 8301P1 mouth to join.

3. by the described calculus instrument of claim 1, it is characterized in that temperature transmitter (I) circuit is three-wire system P _T100Platinum resistance thermometer sensor, is with R ₁, R ₂, R ₃Form wheatstone bridge, after amplifying, become the V of 0～5V _tVoltage.

4. by the described calculus instrument of claim 1, it is characterized in that pulse input circuit (VI) front is a sensitivity adjusting, input optocoupler (VII) is exported with square-wave pulse after secondary amplifies.

5. by the described calculus instrument of claim 1, it is characterized in that the input end of multiway analog switch (II) has temperature to become fortune device (I) input end V _tBe connected to B ₂Pressure reduction input Δ P receives A0B0, and pressure unit input end D is connected to A ₁B ₁Output terminal is connected to electric voltage/frequency converter (III), and converter (III) output is connected to photoelectrical coupler (IV).

6. by the described calculus instrument of claim 1, it is characterized in that current output circuit is CPU (XIII) address end D ₀～D ₇(XVII) joins with programmable counter/timer, joins with photoelectrical coupler (XVIII) by amplifying time-delay, and photoelectrical coupler (XVIII) output connects two-stage triode amplification back and exports with current forms.