CN109253770A - A kind of anti-theft type rotz flowmeter - Google Patents
A kind of anti-theft type rotz flowmeter Download PDFInfo
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- CN109253770A CN109253770A CN201811390436.0A CN201811390436A CN109253770A CN 109253770 A CN109253770 A CN 109253770A CN 201811390436 A CN201811390436 A CN 201811390436A CN 109253770 A CN109253770 A CN 109253770A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/04—Compensating or correcting for variations in pressure, density or temperature of gases to be measured
- G01F15/043—Compensating or correcting for variations in pressure, density or temperature of gases to be measured using electrical means
- G01F15/046—Compensating or correcting for variations in pressure, density or temperature of gases to be measured using electrical means involving digital counting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
- G01F15/075—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means
- G01F15/0755—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means involving digital counting
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The present invention relates to a kind of anti-theft type rotz flowmeter, including base table, mechanical counter and volume correction instrument, mechanical counter is equipped with the shell of metal material, and the information display window on shell is equipped with the panel of tempered glass material；Flow sensing circuit in mechanical counter includes the connector P1 of gage probe U1, the first magnetic induction sensor U2 and Header4 type；The VCC pin of gage probe U1 connects power supply, GND pin ground connection, and OUT pin is connect with the terminal 2 of connector P1；The VCC pin of first magnetic induction sensor U2 connects power supply, GND pin ground connection, and OUT pin is connect with the terminal 1 of connector P1, and the terminal 3 of connector P1 is grounded, and the terminal 4 of connector P1 connects power supply；Gage probe U1 is used for detection gas flow, and the first magnetic induction sensor U2 is used for detection magnetic interference signal, and connector P1 is connect with the microprocessor being arranged in volume correction instrument.It has the advantages that simple, safe and reliable, the diamagnetic performance of structure is good, anti-theft gaseous ability is strong.
Description
Technical field
The present invention relates to a kind of gas flowmeters, and in particular to a kind of mechanical counter uses metal shell and tempered glass
The anti-theft type rotz flowmeter of panel.
Background technique
With the development of economy and society, natural gas is more and more wider as a kind of its application field of clear energy sources, consumption figure
Also increasing year by year.Gas flowmeter is the common measuring equipment of gas distributing system, measures tolerance and valuation as both sides of supply and demand
Foundation, the accuracy of metering is directly related to the fairness of transaction.Gas flowmeter is divided into rotz flowmeter and waist in turn
Two kinds of meter, rotz flowmeter is mainly made of base table, mechanical counter and volume correction instrument, the temperature and pressure being arranged in base table
The flow sensing circuit (being equipped with gage probe) being arranged in force snesor and mechanical counter is respectively and in volume correction instrument
The microprocessor of setting connects, temperature signal, pressure signal and the mechanical counter inspection detected by volume correction instrument according to base table
Gas flow operating condition volume is converted to gas flow mark condition volume by the flow signal of survey, in order to valuate.Existing waist is in turn
For its mechanical counter of meter using plastic shell and perspex panels, intensity is lower, and anti-penetration ability is poor, and it is flowed
Amount detection circuit, which is highly susceptible to interference magnetic field, to be influenced.Be based on defect existing for its structure and working principle, it is some not
The normal work of rotz flowmeter is influenced to realize robber's gas frequently with various means when method molecule.Such as, the steel wire that benefit has burning red is worn
The shell or panel of saturating mechanical counter, which block character wheel, makes mechanical counter stop counting；For another example, flow is influenced using kicker magnet
Detection circuit (gage probe) makes it that can not provide normal flow detecting signal, for another example, by opening volume correction instrument simultaneously
Fail temperature signal wire, pressure signal line, flow signal line or power supply line.Once illegal point is stolen by above-mentioned means
Gas will cause very huge economic loss to natural gas management unit, and seriously affect industry development.
Summary of the invention
The object of the present invention is to provide a kind of anti-theft type rotz flowmeter, safe and reliable, diamagnetisms simple with structure
The advantage that energy is good, anti-theft gaseous ability is strong.
For solve the above-mentioned problems in the prior art, a kind of anti-theft type rotz flowmeter provided by the invention, including
Base table, mechanical counter and volume correction instrument, mechanical counter are mounted on the front side of base table, and volume correction instrument is mounted on base table
Upside, the mechanical counter are equipped with the shell of metal material, and the information display window on shell is equipped with tempered glass material
Panel；Flow sensing circuit is equipped in mechanical counter, flow sensing circuit includes gage probe U1, the first magnetic strength inductive sensing
The connector P1 of device U2 and Header4 type；The VCC pin of gage probe U1 connects power supply, and the GND pin of gage probe U1 connects
Ground, the OUT pin of gage probe U1 are connect with the terminal 2 of connector P1；The VCC pin of first magnetic induction sensor U2 connects electricity
Source, the GND pin ground connection of the first magnetic induction sensor U2, the OUT pin of the first magnetic induction sensor U2 and the end of connector P1
Son 1 connects, and the terminal 3 of connector P1 is grounded, and the terminal 4 of connector P1 connects power supply；Gage probe U1 and the first magnetic induction pass
Sensor U2 is Hall sensor, and gage probe U1 is used for detection gas flow, and the first magnetic induction sensor U2 is for detecting
Magnetic disturbance signal, connector P1 are connect with the microprocessor being arranged in volume correction instrument.
Further, a kind of anti-theft type rotz flowmeter of the present invention, wherein the flow sensing circuit further includes the second magnetic
Inductive pick-up U3 and NAND gate chip U4；The OUT pin of the A pin of NAND gate chip U4 and the second magnetic induction sensor U3 connect
It connects, the B pin of NAND gate chip U4 is connect with the OUT pin of the first magnetic induction sensor U2, the GND pin of NAND gate chip U4
Ground connection, the VCC pin of NAND gate chip U4 connect power supply, and the Y pin of NAND gate chip U4 is connect with the terminal 1 of connector P1；The
The VCC pin of two magnetic induction sensor U3 connects power supply, the GND pin ground connection of the second magnetic induction sensor U3；Second magnetic induction passes
Sensor U3 is Hall sensor, and the second magnetic induction sensor U3 and the first magnetic induction sensor U2 are correspondingly arranged at gage probe
The two sides of U1.
Further, a kind of anti-theft type rotz flowmeter of the present invention, wherein the volume correction instrument, which is equipped with to uncap, detects electricity
Road, detection circuit of uncapping include infrared emission unit and infrared receiver, infrared emission unit include infrared transmitting tube D1 and
Triode Q1, the anode of infrared transmitting tube D1 connect power supply, and the cathode of infrared transmitting tube D1 is connect with the collector of triode Q1, and three
The emitter of pole pipe Q1 is grounded, and the base stage of triode Q1 is connect with the microprocessor being arranged in volume correction instrument；Infrared receiver
Unit includes infrared receiving tube D2, the cathode ground connection of infrared receiving tube D2, the anode of infrared receiving tube D2 respectively with power supply and micro-
Processor connection；Infrared transmitting tube D1 is arranged in the main body of volume correction instrument, and infrared receiving tube D2 is encapsulated in volume correction instrument
Lid medial surface, the packaging body of infrared receiving tube D2 is equipped with the light hole opposite with infrared transmitting tube D1.
Further, a kind of anti-theft type rotz flowmeter of the present invention, wherein the infrared emission unit further includes resistance R1
It is connected on resistance R2, resistance R1 between the cathode of infrared transmitting tube D1 and the collector of triode Q1, the both ends pair of resistance R2
It should be connect with the base stage of triode Q1 and emitter；The infrared receiver further includes resistance R3, and resistance R3 is connected on infrared
Between the anode and power supply of reception pipe D2.
Further, a kind of anti-theft type rotz flowmeter of the present invention, wherein the volume correction instrument is equipped with uninterrupted power supply
Circuit, uninterrupted power supply circuit include main power source, backup power source, the first controllable switch, the second controllable switch, first voltage sampling
Module and second voltage sampling module；Main power source is in parallel with backup power source, and the first controllable switch and the second controllable switch are MOS
Pipe, the first controllable switch and the second controllable switch are correspondingly arranged in the power supply line of main power source and backup power source, and first is controllable
The control terminal of switch and the second controllable switch is connect with the microprocessor being arranged in volume correction instrument respectively；First voltage sampling
The corresponding anode with main power source and backup power source of the input terminal of module and second voltage sampling module is connect, and first voltage samples mould
The output end of block and second voltage sampling module is connect with microprocessor respectively.
Further, a kind of anti-theft type rotz flowmeter of the present invention, wherein the first voltage sampling module includes operation
The pin 1 of amplifier U5, resistance R4 and resistance R5, operational amplifier U5 are connect as output end with microprocessor, operation amplifier
The pin 2 and pin 1 of device U5 is shorted, after the 3 series resistance R4 of pin of operational amplifier U5 just as input terminal and main power source
Pole connects, and is grounded after the 3 series resistance R5 of pin of operational amplifier U5, and the pin 4 of operational amplifier U5 is grounded, operational amplifier
The pin 8 of U5 connects power supply, and resistance R4 is variable resistance.
Further, a kind of anti-theft type rotz flowmeter of the present invention, wherein the second voltage sampling module includes operation
The pin 1 of amplifier U6, resistance R6 and resistance R7, operational amplifier U6 are connect as output end with microprocessor, operation amplifier
The pin 2 of device U6 and pin 1 are shorted, as input terminal and backup power source after the 3 series resistance R6 of pin of operational amplifier U6
Anode connects, and is grounded after the 3 series resistance R7 of pin of operational amplifier U6, and the pin 4 of operational amplifier U6 is grounded, operation amplifier
The pin 8 of device U6 connects power supply, and resistance R6 is variable resistance.
A kind of anti-theft type rotz flowmeter of the present invention compared with prior art, has the advantage that the present invention passes through setting
Mechanical counter, is mounted on the front side of base table by base table, mechanical counter and volume correction instrument, and volume correction instrument is mounted on base
The upside of table allows mechanical counter to use the shell of metal material, and the information display window on shell is allowed to use tempered glass material
The panel of matter；And make flow sensing circuit in mechanical counter be arranged gage probe U1, the first magnetic induction sensor U2 and
The connector P1 of Header4 type；It allows the VCC pin of gage probe U1 to connect power supply, the GND pin of gage probe U1 is allowed to connect
Ground, and the OUT pin of gage probe U1 is allowed to connect with the terminal 2 of connector P1；The VCC of the first magnetic induction sensor U2 is allowed to manage
Foot connects power supply, and the GND pin of the first magnetic induction sensor U2 is allowed to be grounded, and allow the first magnetic induction sensor U2 OUT pin with
The terminal 1 of connector P1 connects, and is grounded the terminal 3 of connector P1, and the terminal 4 of connector P1 connects power supply；Wherein, metering passes
Sensor U1 and the first magnetic induction sensor U2 is Hall sensor, and gage probe U1 is used for detection gas flow, the first magnetic
Inductive pick-up U2 is used for detection magnetic interference signal, and connector P1 is connect with the microprocessor being arranged in volume correction instrument.By
This just constitutes the rotz flowmeter that a kind of simple, safe and reliable, the diamagnetic performance of structure is good, anti-theft gaseous ability is strong.Compared to existing
Some rotz flowmeters, the present invention allow the information on shell to show by allowing mechanical counter to use the shell of metal material
Window use tempered glass material panel, can effectively prevent foreign object (such as burning red steel wire) pierce through mechanical counter shell or
Panel blocks character wheel, enhances rotz flowmeter safety.Meanwhile the present invention is by allowing flow sensing circuit to add the first magnetic strength
Inductive sensing device U2 allows gage probe U1 real-time detection gas flow to measure and pass when there is interference magnetic field in practical applications
Sensor U1 and the first magnetic induction sensor U2 can be affected simultaneously, the first magnetic induction sensor U2 trigger signal and be passed by allowing
Microprocessor is given, replaces detection of gas flow rate value to carry out gas flow mark condition body by microprocessor using gas flow substitution value
Long-pending calculating, can effectively avoid rotz flowmeter because being disturbed magnetic field influences the problem of can not normally measuring, and enhances waist in turn
The diamagnetic jamming performance of meter.By the application of both the above technological means, the present invention effectively increases the anti-of rotz flowmeter
Gas ability is stolen, the generation for stealing gas behavior is reduced, the fairness of both sides of supply and demand transaction is ensure that, promotes the orderly hair of industry
Exhibition.
Shown specific embodiment is made a kind of anti-theft type rotz flowmeter of the present invention further detailed with reference to the accompanying drawing
Illustrate:
Detailed description of the invention
Fig. 1 is a kind of general illustration of anti-theft type rotz flowmeter of the present invention；
Fig. 2 is the schematic diagram of flow sensing circuit in a kind of anti-theft type rotz flowmeter of the present invention；
Fig. 3 is the schematic diagram of detection circuit of uncapping in a kind of anti-theft type rotz flowmeter of the present invention；
Fig. 4 is the schematic diagram of uninterrupted power supply circuit in a kind of anti-theft type rotz flowmeter of the present invention；
Fig. 5 is the schematic diagram of first voltage sampling module in a kind of anti-theft type rotz flowmeter of the present invention；
Fig. 6 is the schematic diagram of second voltage sampling module in a kind of anti-theft type rotz flowmeter of the present invention.
Specific embodiment
Firstly the need of explanation, the nouns of locality such as heretofore described upper and lower, front, rear, left and right only with reference to the accompanying drawings into
Capable description, in order to understand, not to technical solution of the present invention and be claimed range progress limitation.
A kind of specific embodiment of anti-theft type rotz flowmeter of the present invention as depicted in figs. 1 and 2, including base table 1, machinery
Counter 2 and volume correction instrument 3.Mechanical counter 2 is mounted on to the front side of base table 1, volume correction instrument 3 is mounted on base table 1
Upside.Mechanical counter 2 is allowed using the shell of metal material, the information display window on shell is allowed to use tempered glass material
Panel.And make flow sensing circuit in mechanical counter 2 be arranged gage probe U1, the first magnetic induction sensor U2 and
The connector P1 of Header4 type.It allows the VCC pin of gage probe U1 to connect power supply, the GND pin of gage probe U1 is allowed to connect
Ground, and it connect the OUT pin of gage probe U1 with the terminal 2 of connector P1.The VCC of the first magnetic induction sensor U2 is allowed to manage
Foot connects power supply, and the GND pin of the first magnetic induction sensor U2 is allowed to be grounded, and make the OUT pin of the first magnetic induction sensor U2 with
The terminal 1 of connector P1 connects.And the terminal 3 of connector P1 is allowed to be grounded, allow the terminal 4 of connector P1 to connect power supply.Wherein, it measures
Sensor U1 and the first magnetic induction sensor U2 is Hall sensor, and gage probe U1 is used for detection gas flow, and first
Magnetic induction sensor U2 is used for detection magnetic interference signal, and connector P1 connects with the microprocessor 39 being arranged in volume correction instrument 3
It connects.
It is arranged through the above structure and just constitutes that a kind of simple, safe and reliable, the diamagnetic performance of structure is good, anti-theft gaseous ability is strong
Rotz flowmeter.Compared to existing rotz flowmeter, the present invention is by allowing mechanical counter 2 using the outer of metal material
Shell, and the information display window on shell is allowed to use the panel of tempered glass material, foreign object can be effectively prevent (such as to burn red steel
Silk) pierce through mechanical counter 2 shell or panel block character wheel, enhance rotz flowmeter safety.Meanwhile the present invention passes through
It allows flow sensing circuit to add the first magnetic induction sensor U2, in practical applications, allows gage probe U1 real-time detection gas
Flow, when there is interference magnetic field, gage probe U1 and the first magnetic induction sensor U2 can be affected simultaneously, by allowing first
Magnetic induction sensor U2 trigger signal simultaneously sends microprocessor 39 to, replaces gas by 39 using gas flow substitution value of microprocessor
Body flow detection value carries out the calculating of gas flow mark condition volume, and can effectively avoid rotz flowmeter because being disturbed magnetic field influences nothing
The problem of method is normally measured enhances the diamagnetic jamming performance of rotz flowmeter.By the application of both the above technological means, originally
Invention effectively increases the anti-theft gaseous ability of rotz flowmeter, reduces the generation for stealing gas behavior, ensure that both sides of supply and demand are traded
Fairness, promote the orderly development of industry.It should be noted that aluminium alloy, stainless can be used in the shell of mechanical counter 2
The production of the various metals material such as steel, preferably aluminium alloy have the advantages that light, valence is low, are easy molding；Gage probe U1 and
The Hall sensor of YS44E type can be used in first magnetic induction sensor U2, and but it is not limited to this, can also use other same function
The sensor of energy.
As prioritization scheme, present embodiment allow flow sensing circuit be provided with the second magnetic induction sensor U3 and with
NOT gate chip U4.Wherein, the A pin of NAND gate chip U4 is connect with the OUT pin of the second magnetic induction sensor U3, NAND gate core
The B pin of piece U4 is connect with the OUT pin of the first magnetic induction sensor U2, the GND pin ground connection of NAND gate chip U4, NAND gate
The VCC pin of chip U4 connects power supply, and the Y pin of NAND gate chip U4 is connect with the terminal 1 of connector P1；Second magnetic strength inductive sensing
The VCC pin of device U3 connects power supply, the GND pin ground connection of the second magnetic induction sensor U3.And the second magnetic induction is allowed to pass in arrangement
Sensor U3 and the first magnetic induction sensor U2 is correspondingly arranged at the two sides of gage probe U1.As long as this first magnetic of structure setting
Inductive pick-up U2 and the second magnetic induction sensor U3 one of both detect magnetic disturbance signal, trigger signal and can make micro- place
It manages device 39 and the calculating of gas flow mark condition volume is carried out using gas flow substitution value, further enhance the diamagnetic of rotz flowmeter
Jamming performance.In practical applications, Multiple Type, such as HD74HCOOP can be used in NAND gate chip U4, as long as being able to achieve this hair
Bright technical purpose.For the stability and safety for enhancing flow sensing circuit, present embodiment also allows flow to examine
Slowdown monitoring circuit is provided with capacitor C1 and capacitor C2, and the corresponding VCC pin and GND with gage probe U1 in the both ends of capacitor C1 is allowed to manage
Foot connection allows the both ends correspondence of capacitor C2 to connect with the VCC pin of the first magnetic induction sensor U2 and GND pin, and makes second
The corresponding VCC pin and GND pin with the first magnetic induction sensor U2 of the VCC pin and GND pin of magnetic induction sensor U3 connects
It connects, to simplify structure.
As scheme is advanced optimized, as shown in figure 3, present embodiment allows volume correction instrument 3 to be provided with inspection of uncapping
Slowdown monitoring circuit.Detection circuit of uncapping specifically includes infrared emission unit 31 and infrared receiver 32.Infrared emission unit 31 includes
Infrared transmitting tube D1 and triode Q1, allows the anode of infrared transmitting tube D1 to connect power supply, allow infrared transmitting tube D1 cathode and three poles
The collector of pipe Q1 connects, and allows the emitter of triode Q1 to be grounded, and connect the base stage of triode Q1 with microprocessor 39.It is red
Outer receiving unit 32 includes infrared receiving tube D2, and the cathode of infrared receiving tube D2 is allowed to be grounded, and allows the anode of infrared receiving tube D2
It is connect respectively with power supply and microprocessor 39.Wherein, infrared transmitting tube D1 is arranged in the main body of volume correction instrument, infrared receiver
Pipe D2 is encapsulated in the lid medial surface of volume correction instrument, and setting and infrared transmitting tube D1 on the packaging body of infrared receiving tube D2
Opposite light hole.This structure setting exports pulse to infrared emission unit 31 in practical applications, by microprocessor 39
Signal is controlled, the infrared transmitting tube D1 of infrared emission unit 31 emits infrared signal.When the lid of volume correction instrument 3 is to close
When state, because the packaging body of infrared receiving tube D2 is equipped with the light hole opposite with infrared transmitting tube D1, infrared receiving tube D2 will
It receives infrared signal and is connected, the output of infrared receiver 32 at this time is low level.And work as the lid of volume correction instrument 3
It is infrared at this time because the angle change of light hole causes infrared receiving tube D2 that can not receive infrared signal when being in an open state
The output of receiving unit 32 is high level.Microprocessor 39 can quickly judge volume according to the level that infrared receiver 32 exports
The switch state of correction instrument lid.The present invention is arranged through the above structure can carry out detection of uncapping to volume correction instrument 3, and
By to the time of uncapping, for several times and relevant information records, can be to uncap and destroy privately volume correction instrument reservation evidence；And
By compare front and back of uncapping temperature, pressure and flow detecting signal can accurate judgement whether have artificial destruction or influence each detection
Signal, and gas flow mark condition volume is participated in by using corresponding substitution value when each detection signal occurs abnormal and is calculated, it protects
The normal metering for having demonstrate,proved volume correction instrument further improves the safety and anti-theft gaseous ability of rotz flowmeter.To guarantee to open
The stability and safety of lid detection circuit, present embodiment allow infrared emission unit 31 to be provided with resistance R1 and resistance
R2, wherein resistance R1 is connected between the cathode of infrared transmitting tube D1 and the collector of triode Q1, and the both ends of resistance R2 are corresponding
It is connect with the base stage of triode Q1 and emitter；And infrared receiver 32 is allowed to be provided with resistance R3, and be connected on resistance R3
Between the anode and power supply of infrared receiving tube D2.
As shown in figure 4, present embodiment is provided with uninterrupted power supply circuit also in volume correction instrument 3.Uninterruptedly
Power supply circuit specifically includes main power source 33, backup power source 34, the first controllable switch 35, the second controllable switch 36, first voltage and adopts
Egf block 37 and second voltage sampling module 38.Wherein, main power source 33 is in parallel with backup power source 34；First controllable switch 35 and
Two controllable switches 36 are metal-oxide-semiconductor, and the first controllable switch 35 and the second controllable switch 36 are correspondingly arranged at main power source 33 and spare
In the power supply line of power supply 34, and make the control terminal of the first controllable switch 35 and the second controllable switch 36 respectively with microprocessor 39
Connection；The input terminal of first voltage sampling module 37 and second voltage sampling module 38 correspondence and main power source 33 and backup power source 34
Anode connection, the output end of first voltage sampling module 37 and second voltage sampling module 38 connects with microprocessor 39 respectively
It connects.In practical applications, it allows first voltage sampling module 37 to acquire the supply voltage of main power source 33, allows second voltage sampling module
The supply voltage of 38 acquisition backup power sources 34, allows microprocessor 39 to compare main power voltage signal and backup power source voltage signal,
And being opened or closed for the first controllable switch 35 and the second controllable switch 36 is selectively controlled according to comparison result.Main power source 33
Voltage be higher than 34 voltage of backup power source when, the first controllable switch 35 closure, the second controllable switch 36 disconnect, supplied by main power source 33
Electricity；When the voltage of main power source 33 is lower than the voltage of backup power source 34, the first controllable switch 35 is disconnected, and the second controllable switch 36 closes
It closes, is powered by backup power source 34.This structure setting can effectively avoid main power voltage it is too low when, it is when replacement main power source or artificial
The problem of volume correction instrument 3 can not work normally when removing main power source further enhances the safety of rotz flowmeter and prevents
Steal gas ability.
As specific embodiment, as shown in figure 5, first voltage sampling module 37 specifically includes operational amplifier U5, electricity
Hinder R4 and resistance R5.Wherein, the pin 1 of operational amplifier U5 is connect as output end with microprocessor 39, operational amplifier U5
Pin 2 and pin 1 be shorted, the anode after the 3 series resistance R4 of pin of operational amplifier U5 as input terminal and main power source 33
It connects, is grounded after the 3 series resistance R5 of pin of operational amplifier U5, the pin 4 of operational amplifier U5 is grounded, operational amplifier U5
Pin 8 connect power supply, resistance R4 is variable resistance.As shown in fig. 6, second voltage sampling module 38 include operational amplifier U6,
Resistance R6 and resistance R7.Wherein, the pin 1 of operational amplifier U6 is connect as output end with microprocessor 39, operational amplifier
The pin 2 and pin 1 of U6 is shorted, as input terminal and backup power source 34 after the 3 series resistance R6 of pin of operational amplifier U6
Anode connects, and is grounded after the 3 series resistance R7 of pin of operational amplifier U6, and the pin 4 of operational amplifier U6 is grounded, operation amplifier
The pin 8 of device U6 connects power supply, and resistance R6 is variable resistance.It should be noted that first voltage sampling module 37 and second voltage
Sampling module 38 is not limited to structure type listed above, and the voltage sampling circuit of other same functions also can be used.
Above embodiments are only the descriptions carried out to the preferred embodiment of the present invention, and model not is claimed to the present invention
It encloses and is defined, without departing from the spirit of the design of the present invention, the technology of this field engineers and technicians according to the present invention
The various forms of deformations that scheme is made, should fall within the scope of protection determined by the claims of the present invention.
Claims (7)
1. a kind of anti-theft type rotz flowmeter, including base table (1), mechanical counter (2) and volume correction instrument (3), mechanical count
Device (2) is mounted on the front side of base table (1), and volume correction instrument (3) is mounted on the upside of base table (1), which is characterized in that the machinery
Counter (2) is equipped with the shell of metal material, and the information display window on shell is equipped with the panel of tempered glass material；Machinery meter
Number device (2) in be equipped with flow sensing circuit, flow sensing circuit include gage probe U1, the first magnetic induction sensor U2 and
The connector P1 of Header4 type；The VCC pin of gage probe U1 connects power supply, the GND pin ground connection of gage probe U1, meter
The OUT pin of quantity sensor U1 is connect with the terminal 2 of connector P1；The VCC pin of first magnetic induction sensor U2 connects power supply, the
The GND pin of one magnetic induction sensor U2 is grounded, and the OUT pin of the first magnetic induction sensor U2 and the terminal 1 of connector P1 connect
It connects, the terminal 3 of connector P1 is grounded, and the terminal 4 of connector P1 connects power supply；Gage probe U1 and the first magnetic induction sensor U2
It is Hall sensor, gage probe U1 is used for detection gas flow, and the first magnetic induction sensor U2 is for detecting magnetic disturbance
Signal, connector P1 are connect with the microprocessor being arranged in volume correction instrument (3).
2. a kind of anti-theft type rotz flowmeter described in accordance with the claim 1, which is characterized in that the flow sensing circuit also wraps
Include the second magnetic induction sensor U3 and NAND gate chip U4；The A pin of NAND gate chip U4 and the second magnetic induction sensor U3's
The connection of OUT pin, the B pin of NAND gate chip U4 are connect with the OUT pin of the first magnetic induction sensor U2, NAND gate chip U4
GND pin ground connection, the VCC pin of NAND gate chip U4 connects power supply, the Y pin of NAND gate chip U4 and the terminal of connector P1
1 connection；The VCC pin of second magnetic induction sensor U3 connects power supply, the GND pin ground connection of the second magnetic induction sensor U3；Second
Magnetic induction sensor U3 is Hall sensor, and the second magnetic induction sensor U3 and the first magnetic induction sensor U2 are correspondingly arranged at meter
The two sides of quantity sensor U1.
3. a kind of anti-theft type rotz flowmeter described in accordance with the claim 1, which is characterized in that the volume correction instrument (3) sets
It uncaps detection circuit, detection circuit of uncapping includes infrared emission unit (31) and infrared receiver (32), infrared emission list
First (31) include infrared transmitting tube D1 and triode Q1, and the anode of infrared transmitting tube D1 connects power supply, the cathode of infrared transmitting tube D1
It is connect with the collector of triode Q1, the emitter ground connection of triode Q1, the base stage of triode Q1 and setting are in volume correction instrument
(3) the microprocessor connection in；Infrared receiver (32) includes infrared receiving tube D2, and the cathode of infrared receiving tube D2 is grounded,
The anode of infrared receiving tube D2 is connect with power supply and microprocessor respectively；Infrared transmitting tube D1 is arranged in volume correction instrument (3)
In main body, infrared receiving tube D2 is encapsulated in the lid medial surface of volume correction instrument (3), and the packaging body of infrared receiving tube D2 is equipped with
The light hole opposite with infrared transmitting tube D1.
The detection circuit 4. a kind of volume correction instrument described in accordance with the claim 3 is uncapped, which is characterized in that the infrared emission list
First (31) further include resistance R1 and resistance R2, resistance R1 be connected on infrared transmitting tube D1 cathode and triode Q1 collector it
Between, the both ends correspondence of resistance R2 is connect with the base stage of triode Q1 and emitter；The infrared receiver (32) further includes electricity
R3 is hindered, resistance R3 is connected between the anode and power supply of infrared receiving tube D2.
5. a kind of anti-theft type rotz flowmeter described in accordance with the claim 1, which is characterized in that the volume correction instrument (3) sets
Have a uninterrupted power supply circuit, uninterrupted power supply circuit include main power source (33), backup power source (34), the first controllable switch (35),
Second controllable switch (36), first voltage sampling module (37) and second voltage sampling module (38)；Main power source (33) with it is spare
Power supply (34) is in parallel, and the first controllable switch (35) and the second controllable switch (36) are metal-oxide-semiconductor, the first controllable switch (35) and the
Two controllable switches (36) are correspondingly arranged in the power supply line of main power source (33) and backup power source (34), the first controllable switch (35)
It is connect respectively with the microprocessor being arranged in volume correction instrument (3) with the control terminal of the second controllable switch (36)；First voltage
The input terminal of sampling module (37) and second voltage sampling module (38) correspondence and main power source (33) and backup power source (34) are just
The output end of pole connection, first voltage sampling module (37) and second voltage sampling module (38) is connect with microprocessor respectively.
6. a kind of anti-theft type rotz flowmeter according to claim 5, which is characterized in that the first voltage sampling module
It (37) include operational amplifier U5, resistance R4 and resistance R5, the pin 1 of operational amplifier U5 connects as output end and microprocessor
Connect, the pin 2 of operational amplifier U5 and pin 1 are shorted, after the 3 series resistance R4 of pin of operational amplifier U5 as input terminal with
The anode of main power source (33) connects, and is grounded after the 3 series resistance R5 of pin of operational amplifier U5, the pin 4 of operational amplifier U5
Ground connection, the pin 8 of operational amplifier U5 connect power supply, and resistance R4 is variable resistance.
7. a kind of anti-theft type rotz flowmeter according to claim 5, which is characterized in that the second voltage sampling module
It (38) include operational amplifier U6, resistance R6 and resistance R7, the pin 1 of operational amplifier U6 connects as output end and microprocessor
Connect, the pin 2 of operational amplifier U6 and pin 1 are shorted, after the 3 series resistance R6 of pin of operational amplifier U6 as input terminal with
The anode of backup power source (34) connects, and is grounded after the 3 series resistance R7 of pin of operational amplifier U6, the pin of operational amplifier U6
4 ground connection, the pin 8 of operational amplifier U6 connect power supply, and resistance R6 is variable resistance.
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| CN201811390436.0A CN109253770B (en) | 2018-11-21 | 2018-11-21 | A kind of anti-theft type rotz flowmeter |
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| CN109253770B (en) | 2019-11-05 |
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