CN109253763B - Anti-theft turbine flowmeter - Google Patents
Anti-theft turbine flowmeter Download PDFInfo
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- CN109253763B CN109253763B CN201811390071.1A CN201811390071A CN109253763B CN 109253763 B CN109253763 B CN 109253763B CN 201811390071 A CN201811390071 A CN 201811390071A CN 109253763 B CN109253763 B CN 109253763B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/32—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
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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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- Measuring Volume Flow (AREA)
Abstract
The invention relates to an anti-theft turbine flowmeter which comprises a base meter, a gear box assembly, a mechanical counter and a volume corrector, wherein a diamagnetic ring is fixed on the base meter, the gear box assembly is fixed on the diamagnetic ring, a driving magnet of the gear box assembly is positioned in the diamagnetic ring and is in magnetic coupling connection with an output assembly of the base meter, the mechanical counter is clamped on the gear box assembly, an output shaft of the gear box assembly is connected with an input shaft of the mechanical counter, the volume corrector is fixed on the mechanical counter, the mechanical counter is provided with a shell made of metal materials, and an information display window on the shell is provided with a panel made of toughened glass materials. The anti-theft device has the advantages of simple structure, safety, reliability, good diamagnetic performance and strong anti-theft capability.
Description
Technical Field
The invention relates to a gas flowmeter, in particular to an anti-theft turbine flowmeter with a mechanical counter adopting a metal shell and a toughened glass panel.
Background
With the development of economy and society, the application field of natural gas as a clean energy source is wider and wider, and the consumption is increased year by year. The gas flowmeter is a common metering device for a natural gas pipe network, and is used as a basis for gas measurement and pricing of a supplier and a supplier, and the metering accuracy of the gas flowmeter is directly related to the fairness of transactions. The gas flowmeter is divided into a turbine flowmeter and a waist wheel flowmeter, the turbine flowmeter mainly comprises a base meter, a gear box assembly, a mechanical counter and a volume corrector, a temperature sensor and a pressure sensor arranged in the base meter and a flow detection circuit (provided with a metering sensor) arranged in the mechanical counter are respectively connected with a microprocessor arranged in the volume corrector, and the volume corrector converts the working condition volume of the gas flow into the volume of the gas flow standard condition according to a temperature signal, a pressure signal and a flow signal detected by the mechanical counter, so that the gas flowmeter is convenient to calculate. The mechanical counter of the existing turbine flowmeter adopts a plastic shell and an organic glass panel, so that the strength is low, the puncture-proof capability is poor, and the magnetic coupling connection structure of the gear box assembly and the base meter and the flow detection circuit are easily influenced by an interference magnetic field. Based on the defects of the structure and the working principle, some lawless persons often adopt various means to influence the normal work of the turbine flowmeter so as to achieve the purpose of gas theft. For example, the mechanical counter is stopped or removed integrally by the fact that a burning steel wire penetrates through the shell or the panel of the mechanical counter to clamp the character wheel; if the magnetic coupling connection structure of the gear box assembly and the base meter and the flow detection circuit are influenced by the strong magnet, if the volume corrector is opened, the temperature signal line, the pressure signal line, the flow signal line or the power supply line are damaged. Once gas stealing is illegally carried out through the means, great economic loss is caused to a natural gas operation and management unit, and the industrial development is seriously influenced.
Disclosure of Invention
The invention aims to provide an anti-theft turbine flowmeter which has the advantages of simple structure, safety, reliability, good diamagnetic performance and strong anti-theft capability.
In order to solve the problems in the prior art, the invention provides an anti-theft turbine flowmeter which comprises a base meter, a gear box assembly, a mechanical counter and a volume corrector, wherein a diamagnetic ring is fixed on the base meter, the gear box assembly is fixed on the diamagnetic ring, a driving magnet of the gear box assembly is positioned in the diamagnetic ring and is in magnetic coupling connection with an output assembly of the base meter, the mechanical counter is clamped on the gear box assembly, an output shaft of the gear box assembly is connected with an input shaft of the mechanical counter, the volume corrector is fixed on the mechanical counter, the mechanical counter is provided with a shell made of metal, and an information display window on the shell is provided with a panel made of tempered glass.
Further, the anti-theft turbine flowmeter is characterized in that a flow detection circuit is arranged in the mechanical counter, and the flow detection circuit comprises a metering sensor U1, a first magnetic induction sensor U2 and a connector P1 of a Header4 type; the VCC pin of the metering sensor U1 is connected with a power supply, the GND pin of the metering sensor U1 is grounded, and the OUT pin of the metering sensor U1 is connected with a terminal 2 of a connector P1; the VCC pin of the first magnetic induction sensor U2 is connected with a power supply, the GND pin of the first magnetic induction sensor U2 is grounded, the OUT pin of the first magnetic induction sensor U2 is connected with the terminal 1 of the connector P1, the terminal 3 of the connector P1 is grounded, and the terminal 4 of the connector P1 is connected with the power supply; the metering sensor U1 and the first magnetic induction sensor U2 are Hall sensors, the metering sensor U1 is used for detecting gas flow, the first magnetic induction sensor U2 is used for detecting magnetic interference signals, and the connector P1 is connected with a microprocessor in the volume correction instrument.
Further, the anti-theft turbine flowmeter of the invention, wherein, the flow detection circuit also includes the second magnetic induction sensor U3 and NAND gate chip U4; the A pin of the NAND gate chip U4 is connected with the OUT pin of the second magnetic induction sensor U3, the B pin of the NAND gate chip U4 is connected with the OUT pin of the first magnetic induction sensor U2, the GND pin of the NAND gate chip U4 is grounded, the VCC pin of the NAND gate chip U4 is connected with a power supply, and the Y pin of the NAND gate chip U4 is connected with a terminal 1 of a connector P1; the VCC pin of the second magnetic induction sensor U3 is connected with a power supply, and the GND pin of the second magnetic induction sensor U3 is grounded; the second magnetic induction sensor U3 is a Hall sensor, and the second magnetic induction sensor U3 and the first magnetic induction sensor U2 are correspondingly arranged on two sides of the metering sensor U1.
Furthermore, the anti-theft type turbine flowmeter of the invention, wherein the flow detection circuit further comprises a capacitor C1 and a capacitor C2, two ends of the capacitor C1 are correspondingly connected with a VCC pin and a GND pin of the metering sensor U1, two ends of the capacitor C2 are correspondingly connected with a VCC pin and a GND pin of the first magnetic induction sensor U2, and a VCC pin and a GND pin of the second magnetic induction sensor U3 are correspondingly connected with a VCC pin and a GND pin of the first magnetic induction sensor U2.
Further, the anti-theft type turbine flowmeter is characterized in that the volume corrector is provided with an uncovering detection circuit, the uncovering detection circuit comprises an infrared emission unit and an infrared receiving unit, the infrared emission unit comprises an infrared emission tube D1 and a triode Q1, the positive electrode of the infrared emission tube D1 is connected with a power supply, the negative electrode of the infrared emission tube D1 is connected with the collector electrode of the triode Q1, the emitter electrode of the triode Q1 is grounded, and the base electrode of the triode Q1 is connected with a microprocessor in the volume corrector; the infrared receiving unit comprises an infrared receiving tube D2, the negative electrode of the infrared receiving tube D2 is grounded, and the positive electrode of the infrared receiving tube D2 is respectively connected with the power supply and the microprocessor; the infrared transmitting tube D1 is arranged on the main body of the volume corrector, the infrared receiving tube D2 is packaged on the inner side surface of the cover of the volume corrector, and the packaging body of the infrared receiving tube D2 is provided with a light through hole opposite to the infrared transmitting tube D1.
Further, the anti-theft turbine flowmeter of the invention, wherein, the infrared emission unit also includes resistance R1 and resistance R2, resistance R1 connects in series between the negative pole of infrared emission tube D1 and the collector of triode Q1, two ends of resistance R2 are connected with base and emitter of triode Q1 correspondingly; the infrared receiving unit further comprises a resistor R3, and the resistor R3 is connected between the anode of the infrared receiving tube D2 and the power supply in series.
Further, the anti-theft turbine flowmeter is characterized in that the volume corrector is provided with an uninterrupted power supply circuit, and the uninterrupted power supply circuit comprises a main power supply, a standby power supply, a first controllable switch, a second controllable switch, a first voltage sampling module and a second voltage sampling module; the main power supply is connected with the standby power supply in parallel, the first controllable switch and the second controllable switch are both MOS tubes and are correspondingly arranged in power supply lines of the main power supply and the standby power supply, and the control ends of the first controllable switch and the second controllable switch are respectively connected with a microprocessor in the volume corrector; the input ends of the first voltage sampling module and the second voltage sampling module are correspondingly connected with the positive electrodes of the main power supply and the standby power supply, and the output ends of the first voltage sampling module and the second voltage sampling module are respectively connected with the microprocessor.
Furthermore, the anti-theft turbine flow meter provided by the invention is characterized in that the first voltage sampling module comprises an operational amplifier U5, a resistor R4 and a resistor R5, wherein a pin 1 of the operational amplifier U5 is connected with the microprocessor as an output end, a pin 2 of the operational amplifier U5 is in short circuit with the pin 1, a pin 3 of the operational amplifier U5 is connected with a resistor R4 in series and then is connected with the positive electrode of a main power supply as an input end, a pin 3 of the operational amplifier U5 is connected with the resistor R5 in series and then is grounded, a pin 4 of the operational amplifier U5 is grounded, a pin 8 of the operational amplifier U5 is connected with the power supply, and the resistor R4 is a variable resistor.
Furthermore, the anti-theft turbine flow meter provided by the invention is characterized in that the second voltage sampling module comprises an operational amplifier U6, a resistor R6 and a resistor R7, wherein a pin 1 of the operational amplifier U6 is connected with the microprocessor as an output end, a pin 2 of the operational amplifier U6 is in short circuit with the pin 1, a pin 3 of the operational amplifier U6 is connected with a resistor R6 in series and then is connected with the positive electrode of the standby power supply as an input end, a pin 3 of the operational amplifier U6 is connected with the resistor R7 in series and then is grounded, a pin 4 of the operational amplifier U6 is grounded, a pin 8 of the operational amplifier U6 is connected with the power supply, and the resistor R6 is a variable resistor.
Compared with the prior art, the anti-theft turbine flowmeter has the following advantages: the mechanical counter is clamped on the gear box assembly, an output shaft of the gear box assembly is connected with an input shaft of the mechanical counter, and the volume corrector is fixed on the mechanical counter, wherein the mechanical counter is a shell made of metal materials, and an information display window on the shell is a panel made of toughened glass materials. Therefore, the turbine flowmeter with simple structure, safety, reliability, good diamagnetic performance and strong anti-theft capability is formed. Compared with the existing turbine flowmeter, the drive magnet of the gear box assembly is positioned in the anti-magnet ring by arranging the anti-magnet ring, so that the magnetic coupling connection structure of the gear box assembly and the base meter output assembly is free from the influence of an interference magnetic field, and the anti-magnetic interference performance of the turbine flowmeter is enhanced; meanwhile, the mechanical counter is made of a metal shell, and the information display window on the shell is made of a panel made of toughened glass, so that foreign objects (such as burnt steel wires) can be effectively prevented from piercing the shell or the panel of the mechanical counter to clamp the character wheel, and the safety of the turbine flowmeter is enhanced. Through the application of the two technical means, the invention effectively improves the gas stealing prevention capability of the turbine flowmeter, reduces the occurrence of gas stealing behavior, ensures the fairness of the trade of the supply and demand parties and promotes the industry development.
The anti-theft turbine flowmeter of the present invention is further described in detail with reference to the following embodiments shown in the accompanying drawings:
drawings
FIG. 1 is a general schematic view of an anti-theft turbine flow meter of the present invention;
FIG. 2 is a front view of a mechanical counter in an anti-theft turbine flow meter of the present invention;
FIG. 3 is a bottom view of a mechanical counter of an anti-theft turbine flow meter according to the present invention;
FIG. 4 is an enlarged view of a portion of the portion A of FIG. 3;
FIG. 5 is a perspective view of an anti-magnet ring and gear box assembly of an anti-theft turbine flow meter of the present invention;
FIG. 6 is a schematic diagram of a flow sensing circuit in an anti-theft turbine flow meter according to the present invention;
FIG. 7 is a schematic diagram of a detection circuit for a middle opening cover of an anti-theft turbine flowmeter according to the present invention;
FIG. 8 is a schematic diagram of an uninterruptible power supply circuit in an anti-theft turbine flow meter according to the present invention;
FIG. 9 is a schematic diagram of a first voltage sampling module of an anti-theft turbine flow meter according to the present invention;
fig. 10 is a schematic diagram of a second voltage sampling module in an anti-theft turbine flow meter according to the present invention.
Detailed Description
First, it should be noted that, the directional terms such as up, down, front, rear, left, right, etc. described in the present invention are only described with reference to the accompanying drawings for understanding, and are not intended to limit the technical solution and the claimed scope of the present invention.
As shown in fig. 1 to 5, an embodiment of the anti-theft turbine flowmeter of the present invention includes a base meter 1, a gear box assembly 2, a mechanical counter 3, and a volume corrector 4. A fixed diamagnetic ring 5 is arranged on the base meter 1, the gear box assembly 2 is fixed on the diamagnetic ring 5, and a driving magnet of the gear box assembly 2 is positioned in the diamagnetic ring 5 and is in magnetic coupling connection with an output assembly of the base meter 1. The mechanical counter 3 is clamped on the gear box component 2, and the output shaft of the gear box component 2 is connected with the input shaft of the mechanical counter 3. The volume corrector 4 is fixed to the mechanical counter 3. The mechanical counter 3 is made of a metal shell 31, and an information display window on the shell 31 is made of a panel 32 made of tempered glass. The turbine flowmeter with simple structure, safety, reliability, good diamagnetic performance and strong anti-theft capability is formed by the structure. Compared with the existing turbine flowmeter, the driving magnet of the gear box assembly 2 is positioned in the anti-magnet ring 5 by arranging the anti-magnet ring 5, so that the magnetic coupling connection structure of the gear box assembly 2 and the output assembly of the basic meter 1 is free from the influence of an interference magnetic field, and the anti-magnetic interference performance of the turbine flowmeter is enhanced; meanwhile, the mechanical counter 3 is made of the shell 31 made of metal materials, and the information display window on the shell 31 is made of the panel 32 made of toughened glass materials, so that foreign objects (such as burnt steel wires) can be effectively prevented from piercing the shell or the panel of the mechanical counter to clamp the character wheel, and the safety of the turbine flowmeter is enhanced. Through the application of the two technical means, the invention effectively improves the gas stealing prevention capability of the turbine flowmeter, reduces the occurrence of gas stealing behaviors and promotes the development of the industry. The housing 31 of the mechanical counter 3 may be made of various metal materials such as aluminum alloy and stainless steel, and preferably, aluminum alloy has advantages of light weight, low cost, and easy molding. It should be noted that, in practical application, in this embodiment, the bottom of the housing 31 of the mechanical counter 3 and the limiting ring 33 in the housing 31 are provided with a limiting groove along the radial direction, the anti-removal inserting plate 34 is installed in the limiting groove, the outer end of the anti-removal inserting plate 34 is provided with a baffle 341 to play a role in blocking, two sides of the middle of the anti-removal inserting plate 34 are respectively provided with an elastic chuck 342, and the elastic chucks 342 are clamped in the first opening of the limiting ring to play a role in limiting, and the inner end of the anti-removal inserting plate 34 is located in the second opening 22 of the connecting plate 21 of the gear box assembly 2 to prevent the mechanical counter 3 and the gear box assembly 2 from rotating relatively. This structure setting clamps the completion back at mechanical counter 3, through preventing tearing open picture peg 34 in the spacing groove insert, can play the effectual purpose of preventing tearing open mechanical counter 3, if other people extract by force prevents tearing open picture peg 34, prevents tearing open the elasticity dop 342 of picture peg 34 both sides and will damage and can not resume, borrows this other people just dare not to rush to dismantle mechanical counter by force, has further improved turbine flowmeter's security and theftproof gas ability.
As an optimized solution, as shown in fig. 6, in the present embodiment, the flow rate detection circuit in the mechanical counter 3 is provided with a metering sensor U1, a first magnetic induction sensor U2, and a Header4 type connector P1. The VCC pin of the meter sensor U1 was connected to the power supply, the GND pin of the meter sensor U1 was connected to ground, and the OUT pin of the meter sensor U1 was connected to the terminal 2 of the connector P1. The VCC pin of the first magnetic induction sensor U2 is connected to the power supply, the GND pin of the first magnetic induction sensor U2 is connected to ground, and the OUT pin of the first magnetic induction sensor U2 is connected to the terminal 1 of the connector P1. And terminal 3 of connector P1 is grounded and terminal 4 of connector P1 is connected to power. The metering sensor U1 and the first magnetic induction sensor U2 are Hall sensors, the metering sensor U1 is used for detecting gas flow, the first magnetic induction sensor U2 is used for detecting magnetic interference signals, and the connector P1 is connected with the microprocessor 49 arranged in the volume corrector 4. This structure sets up in practical application, let measurement sensor U1 detect gas flow in real time, when having the interference magnetic field, measurement sensor U1 and first magnetic induction sensor U2 can receive the influence simultaneously, trigger signal and conveying microprocessor 49 through first magnetic induction sensor U2, let microprocessor 49 use gas flow substitution value to replace the calculation of gas flow standard condition volume, can effectively avoid the turbine flowmeter because of the problem that can't normally measure of the influence of interference magnetic field, the anti-magnetic interference performance and the theftproof gas ability of turbine flowmeter have been strengthened. In practical applications, the metering sensor U1 and the first magnetic induction sensor U2 may be a hall sensor of the YS44E type, but the present invention is not limited thereto, and other sensors having equivalent functions may be used.
Furthermore, in the present embodiment, the flow rate detection circuit is provided with a second magnetic induction sensor U3 and a nand gate chip U4. The A pin of the NAND gate chip U4 is connected with the OUT pin of the second magnetic induction sensor U3, the B pin of the NAND gate chip U4 is connected with the OUT pin of the first magnetic induction sensor U2, the GND pin of the NAND gate chip U4 is grounded, the VCC pin of the NAND gate chip U4 is connected with a power supply, and the Y pin of the NAND gate chip U4 is connected with a terminal 1 of a connector P1; the VCC pin of the second magnetic induction sensor U3 is connected with a power supply, and the GND pin of the second magnetic induction sensor U3 is grounded. And the second magnetic induction sensor U3 and the first magnetic induction sensor U2 are correspondingly arranged on two sides of the metering sensor U1 when the magnetic sensor is arranged. According to the structure, as long as one of the first magnetic induction sensor U2 and the second magnetic induction sensor U3 detects a magnetic interference signal, the signal can be triggered, the microprocessor 49 is enabled to use the gas flow substitution value to calculate the gas flow standard volume, and the magnetic interference resistance of the turbine flowmeter is further enhanced. In practical applications, the nand gate chip U4 can be in various types, such as HD74HCOOP, etc., as long as the technical purpose of the present invention can be achieved. Meanwhile, in the present embodiment, the flow detection circuit is further provided with a capacitor C1 and a capacitor C2, and the two ends of the capacitor C1 are correspondingly connected to the VCC pin and the GND pin of the metering sensor U1, the two ends of the capacitor C2 are correspondingly connected to the VCC pin and the GND pin of the first magnetic induction sensor U2, and the VCC pin and the GND pin of the second magnetic induction sensor U3 are correspondingly connected to the VCC pin and the GND pin of the first magnetic induction sensor U2. The stability and the safety of the flow detection circuit are enhanced by arranging the capacitor C1 and the capacitor C2.
As a further optimization scheme, as shown in fig. 7, the volume correction instrument 4 of the present embodiment is further provided with an uncovering detection circuit. The open cover detection circuit specifically includes an infrared emission unit 41 and an infrared reception unit 42. The infrared emission unit 41 includes an infrared emission tube D1 and a transistor Q1, and has a positive electrode of the infrared emission tube D1 connected to a power supply, a negative electrode of the infrared emission tube D1 connected to a collector of the transistor Q1, an emitter of the transistor Q1 connected to ground, and a base of the transistor Q1 connected to the microprocessor 49 of the volume corrector 4. The infrared receiving unit 42 includes an infrared receiving tube D2 having a negative electrode of the infrared receiving tube D2 grounded and a positive electrode of the infrared receiving tube D2 connected to the power supply and the microprocessor 49, respectively. The infrared transmitting tube D1 is arranged on the main body of the volume corrector, the infrared receiving tube D2 is packaged on the inner side surface of the cover of the volume corrector, and a light through hole opposite to the infrared transmitting tube D1 is arranged on the packaging body of the infrared receiving tube D2. This structure is provided in practical use, and the infrared transmitting tube D1 of the infrared transmitting unit 41 transmits an infrared light signal by the microprocessor 49 outputting a pulse control signal to the infrared transmitting unit 41. When the cover of the volume corrector 4 is in the closed state, since the package of the infrared receiving tube D2 has a light transmitting hole opposite to the infrared transmitting tube D1, the infrared receiving tube D2 receives the infrared light signal and is turned on, and the output of the infrared receiving unit 42 is at a low level. When the cover of the volume corrector 4 is in the open state, the infrared receiving tube D2 cannot receive the infrared light signal due to the angle change of the light-transmitting hole, and the output of the infrared receiving unit 42 is at a high level. The microprocessor 49 can quickly judge the opening and closing state of the cover of the volume correction instrument according to the level output by the infrared receiving unit 42. According to the invention, through carrying out uncovering detection on the volume corrector and recording the uncovering time, times and related information, evidence can be reserved for privately uncovering and destroying the volume corrector. And whether a person destroys or influences each detection signal can be accurately judged by comparing the temperature, the pressure and the flow detection signals before and after the cover is opened, and the corresponding substitute value is used to participate in the volume calculation of the gas flow standard condition when each detection signal is abnormal, so that the normal metering of the volume correction instrument is ensured, and the safety and the gas theft prevention capability of the turbine flowmeter are further improved. In order to ensure the stability and safety of the uncapping detection circuit, in the present embodiment, the infrared emission unit 41 is provided with a resistor R1 and a resistor R2, wherein the resistor R1 is connected in series between the negative electrode of the infrared emission tube D1 and the collector of the triode Q1, and two ends of the resistor R2 are correspondingly connected with the base and the emitter of the triode Q1; the infrared receiving unit 42 is provided with a resistor R3, and a resistor R3 is connected in series between the positive electrode of the infrared receiving tube D2 and the power supply.
As shown in fig. 8, the present embodiment also provides an uninterruptible power supply circuit in the volume correction instrument 4. The uninterruptible power supply circuit specifically includes a main power supply 43, a backup power supply 44, a first controllable switch 45, a second controllable switch 46, a first voltage sampling module 47, and a second voltage sampling module 48. Wherein, the main power supply 43 is connected in parallel with the standby power supply 44; the first controllable switch 45 and the second controllable switch 46 are both MOS transistors, the first controllable switch 45 and the second controllable switch 46 are correspondingly arranged in the power supply lines of the main power supply 43 and the standby power supply 44, and the control ends of the first controllable switch 45 and the second controllable switch 46 are respectively connected with a microprocessor 49 in the volume corrector 4; the input ends of the first voltage sampling module 47 and the second voltage sampling module 48 are correspondingly connected with the positive poles of the main power supply 43 and the standby power supply 44, and the output ends of the first voltage sampling module 47 and the second voltage sampling module 48 are respectively connected with the microprocessor 49. In practical applications, the first voltage sampling module 47 is enabled to collect the supply voltage of the main power supply 43, the second voltage sampling module 48 is enabled to collect the supply voltage of the standby power supply 44, the microprocessor 49 is enabled to compare the main power supply voltage signal and the standby power supply voltage signal, and the first controllable switch 45 and the second controllable switch 46 are selectively controlled to be opened or closed according to the comparison result. When the voltage of the main power supply 43 is higher than the voltage of the standby power supply 44, the first controllable switch 45 is closed, the second controllable switch 46 is opened, and the main power supply 43 supplies power; when the voltage of the main power supply 43 is lower than the voltage of the backup power supply 44, the first controllable switch 45 is opened and the second controllable switch 46 is closed, and the backup power supply 44 supplies power. The structure can effectively avoid the problem that the volume correction instrument cannot normally measure when the voltage of the main power supply is too low, the main power supply is replaced or manually removed, and further enhances the safety and the gas stealing prevention capability of the turbine flowmeter.
As a specific implementation, as shown in fig. 9, the first voltage sampling module 47 specifically includes an operational amplifier U5, a resistor R4, and a resistor R5. Pin 1 of the operational amplifier U5 is connected to the microprocessor 49 as an output terminal, pin 2 of the operational amplifier U5 is short-circuited with pin 1, pin 3 of the operational amplifier U5 is connected in series with a resistor R4 and then connected as an input terminal to the positive electrode of the main power supply 43, pin 3 of the operational amplifier U5 is connected in series with a resistor R5 and then grounded, pin 4 of the operational amplifier U5 is grounded, pin 8 of the operational amplifier U5 is connected to the power supply, and the resistor R4 is a variable resistor. As shown in fig. 10, the second voltage sampling module 48 includes an operational amplifier U6, a resistor R6, and a resistor R7. Pin 1 of the operational amplifier U6 is connected to the microprocessor 49 as an output terminal, pin 2 of the operational amplifier U6 is short-circuited with pin 1, pin 3 of the operational amplifier U6 is connected in series with a resistor R6 and then connected as an input terminal to the positive terminal of the standby power supply 44, pin 3 of the operational amplifier U6 is connected in series with a resistor R7 and then grounded, pin 4 of the operational amplifier U6 is grounded, pin 8 of the operational amplifier U6 is connected to the power supply, and the resistor R6 is a variable resistor.
The above examples are only for describing the preferred embodiments of the present invention, and do not limit the scope of the claimed invention, and various modifications made by the skilled in the art according to the technical solution of the present invention should fall within the scope of the invention defined by the claims without departing from the spirit of the present invention.
Claims (6)
1. An anti-theft type turbine flowmeter comprises a base meter (1), a gear box assembly (2), a mechanical counter (3) and a volume corrector (4), and is characterized in that a diamagnetic ring (5) is fixed on the base meter (1), the gear box assembly (2) is fixed on the diamagnetic ring (5), a driving magnet of the gear box assembly (2) is positioned in the diamagnetic ring (5) and is in magnetic coupling connection with an output assembly of the base meter (1), the mechanical counter (3) is clamped on the gear box assembly (2), an output shaft of the gear box assembly (2) is connected with an input shaft of the mechanical counter (3), the volume corrector (4) is fixed on the mechanical counter (3), the mechanical counter (3) is provided with a shell (31) made of metal, and an information display window on the shell (31) is provided with a panel (32) made of toughened glass;
a flow detection circuit is arranged in the mechanical counter (3), and comprises a metering sensor U1, a first magnetic induction sensor U2 and a Header4 type connector P1; the VCC pin of the metering sensor U1 is connected with a power supply, the GND pin of the metering sensor U1 is grounded, and the OUT pin of the metering sensor U1 is connected with a terminal 2 of a connector P1; the VCC pin of the first magnetic induction sensor U2 is connected with a power supply, the GND pin of the first magnetic induction sensor U2 is grounded, the terminal 3 of the connector P1 is grounded, and the terminal 4 of the connector P1 is connected with the power supply; the metering sensor U1 and the first magnetic induction sensor U2 are Hall sensors, the metering sensor U1 is used for detecting gas flow, the first magnetic induction sensor U2 is used for detecting magnetic interference signals, and the connector P1 is connected with a microprocessor arranged in the volume corrector (4); the flow detection circuit also comprises a second magnetic induction sensor U3 and a NAND gate chip U4; the A pin of the NAND gate chip U4 is connected with the OUT pin of the second magnetic induction sensor U3, the B pin of the NAND gate chip U4 is connected with the OUT pin of the first magnetic induction sensor U2, the GND pin of the NAND gate chip U4 is grounded, the VCC pin of the NAND gate chip U4 is connected with a power supply, and the Y pin of the NAND gate chip U4 is connected with a terminal 1 of a connector P1; the VCC pin of the second magnetic induction sensor U3 is connected with a power supply, and the GND pin of the second magnetic induction sensor U3 is grounded; the second magnetic induction sensor U3 is a Hall sensor, and the second magnetic induction sensor U3 and the first magnetic induction sensor U2 are correspondingly arranged on two sides of the metering sensor U1;
the volume corrector (4) is provided with a cover opening detection circuit, the cover opening detection circuit comprises an infrared emission unit (41) and an infrared receiving unit (42), the infrared emission unit (41) comprises an infrared emission tube D1 and a triode Q1, the positive electrode of the infrared emission tube D1 is connected with a power supply, the negative electrode of the infrared emission tube D1 is connected with the collector electrode of the triode Q1, the emitter electrode of the triode Q1 is grounded, and the base electrode of the triode Q1 is connected with a microprocessor arranged in the volume corrector (4); the infrared receiving unit (42) comprises an infrared receiving tube D2, the negative electrode of the infrared receiving tube D2 is grounded, and the positive electrode of the infrared receiving tube D2 is respectively connected with the power supply and the microprocessor; the infrared transmitting tube D1 is arranged on the main body of the volume corrector (4), the infrared receiving tube D2 is packaged on the inner side surface of the cover of the volume corrector (4), and the packaging body of the infrared receiving tube D2 is provided with a light through hole opposite to the infrared transmitting tube D1.
2. The anti-theft turbine flowmeter of claim 1, wherein the flow detection circuit further comprises a capacitor C1 and a capacitor C2, wherein two ends of the capacitor C1 are correspondingly connected to the VCC pin and the GND pin of the meter sensor U1, two ends of the capacitor C2 are correspondingly connected to the VCC pin and the GND pin of the first magnetic induction sensor U2, and two ends of the second magnetic induction sensor U3 are correspondingly connected to the VCC pin and the GND pin of the first magnetic induction sensor U2.
3. The anti-theft turbine flowmeter as claimed in claim 2, wherein said infrared emission unit (41) further comprises a resistor R1 and a resistor R2, wherein the resistor R1 is connected in series between the negative electrode of the infrared emission tube D1 and the collector of the transistor Q1, and the two ends of the resistor R2 are correspondingly connected to the base and the emitter of the transistor Q1; the infrared receiving unit (42) further comprises a resistor R3, and the resistor R3 is connected between the anode of the infrared receiving tube D2 and the power supply in series.
4. An anti-theft turbine flowmeter according to claim 1, characterized in that said volume corrector (4) is provided with an uninterruptible power supply circuit comprising a main power supply (43), a backup power supply (44), a first controllable switch (45), a second controllable switch (46), a first voltage sampling module (47) and a second voltage sampling module (48); the main power supply (43) is connected with the standby power supply (44) in parallel, the first controllable switch (45) and the second controllable switch (46) are both MOS (metal oxide semiconductor) tubes, the first controllable switch (45) and the second controllable switch (46) are correspondingly arranged in power supply lines of the main power supply (43) and the standby power supply (44), and control ends of the first controllable switch (45) and the second controllable switch (46) are respectively connected with a microprocessor arranged in the volume corrector (4); the input ends of the first voltage sampling module (47) and the second voltage sampling module (48) are correspondingly connected with the positive electrodes of the main power supply (43) and the standby power supply (44), and the output ends of the first voltage sampling module (47) and the second voltage sampling module (48) are respectively connected with the microprocessor.
5. The anti-theft turbine flowmeter of claim 4, wherein the first voltage sampling module (47) comprises an operational amplifier U5, a resistor R4 and a resistor R5, wherein pin 1 of the operational amplifier U5 is connected as an output terminal to the microprocessor, pin 2 of the operational amplifier U5 is shorted to pin 1, pin 3 of the operational amplifier U5 is connected in series with a resistor R4 as an input terminal to the positive terminal of the main power supply (43), pin 3 of the operational amplifier U5 is connected in series with the resistor R5 and then grounded, pin 4 of the operational amplifier U5 is grounded, pin 8 of the operational amplifier U5 is connected to the power supply, and the resistor R4 is a variable resistor.
6. The anti-theft turbine flowmeter of claim 4, wherein the second voltage sampling module (48) comprises an operational amplifier U6, a resistor R6 and a resistor R7, wherein pin 1 of the operational amplifier U6 is connected as an output terminal to the microprocessor, pin 2 of the operational amplifier U6 is shorted to pin 1, pin 3 of the operational amplifier U6 is connected in series with a resistor R6 as an input terminal to the positive electrode of the backup power supply (44), pin 3 of the operational amplifier U6 is connected in series with a resistor R7 and then grounded, pin 4 of the operational amplifier U6 is grounded, pin 8 of the operational amplifier U6 is connected to the power supply, and the resistor R6 is a variable resistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811390071.1A CN109253763B (en) | 2018-11-21 | 2018-11-21 | Anti-theft turbine flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811390071.1A CN109253763B (en) | 2018-11-21 | 2018-11-21 | Anti-theft turbine flowmeter |
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| CN109253763B true CN109253763B (en) | 2020-05-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008224320A (en) * | 2007-03-09 | 2008-09-25 | Toshiba Corp | Water meter |
| CN201141775Y (en) * | 2007-12-25 | 2008-10-29 | 上海埃科燃气测控设备有限公司 | Double-display gas roots flowmeter |
| CN201535682U (en) * | 2009-11-18 | 2010-07-28 | 北京市燕山工业燃气设备有限公司 | Mechanical intelligent CPU card integrated gas turbine flow meter |
| CN103557901A (en) * | 2013-11-20 | 2014-02-05 | 梁国栋 | Intelligent metering device with antimagnetic function |
| CN204425030U (en) * | 2015-02-13 | 2015-06-24 | 西南交通大学 | For the power control system of intelligent gas meter |
| CN205015062U (en) * | 2015-06-01 | 2016-02-03 | 浙江苍南仪表集团有限公司 | Structure is adjusted in turbine flowmeter measurement |
| CN207395833U (en) * | 2017-11-20 | 2018-05-22 | 湖南威铭能源科技有限公司 | For the tamper detection circuit of valve control device metering platelet |
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