CN207779989U - A kind of natural gas CO2Content detection device - Google Patents

Abstract

The utility model discloses a kind of natural gas CO₂Content detection device, including：CO₂Gas sensor further includes CO₂Content detection circuit, the CO₂Content detection circuit includes CO₂Content indicating circuit；The CO₂Content indicating circuit includes：Accumulator, first switch, CO₂Gas sensor, external power supply, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, first comparator, the second comparator, third comparator, the first light emitting diode, the second light emitting diode, third light emitting diode, the 7th resistance and the 9th resistance；By the detection device, the CO in natural gas can be effectively detected₂Gas, while CO₂CO can be explicitly indicated in content indicating circuit₂Concentration scale be easy to observe by the light emitting diode of different colours, by warning circuit, work as CO₂The CO in staff's natural gas is prompted when content superthreshold₂Gas is excessive, securely and reliably, improves the safety of gas-monitoring, and the device analysis speed is fast, and accuracy of detection is high.

Description

A kind of natural gas CO2Content detection device

Technical field

The utility model belongs to field of gas detection, and in particular to a kind of natural gas CO₂Content detection device.

Background technology

Natural gas is a kind of energy that air source is very abundant, but transportation problem early has become headache problem, including steel cylinder transport, With long-distance pipeline transportation.Main cause is that a certain concentration carbon dioxide gas contained in natural gas causes ground gathering line The accident that corrosion even seriously endangers occurs again and again, great economic loss is not only brought to oil-gas field development, while also making At certain environmental pollution.The content height of carbon dioxide just determines that the degree of corrosion, carbon dioxide corrosion are most typical Feature shows as local spot corrosion, the corrosion of ringworm shape and mesa shaped pitting corrosion.Therefore, to the control of the carbon dioxide content in natural gas System is one of developing key link of industrial chain, directly decides the development of natural gas.People have been subjected to it energetically at present Concern and attention.

Existing natural gas CO₂Content detection device is cumbersome, equipment is complicated is unfavorable for the universal of detection method, detection While cannot simply and effectively react CO in natural gas₂Concentration value, and natural gas CO₂Super content alarm threshold value it is non-adjustable, Poor universality, detection are insensitive.

Utility model content

To overcome natural gas CO of the existing technology₂Content detection device is complicated for operation and detection is insensitive inaccurate Technological deficiency, the utility model discloses a kind of natural gas CO₂Content detection device.

Technical solution adopted by the utility model to solve its technical problems is a kind of natural gas CO₂Content detection device, Including：CO₂Gas sensor further includes：CO₂Content detection circuit, the CO₂Content detection circuit includes CO₂Content instruction electricity Road；The CO₂Content indicating circuit includes：Accumulator, first switch, CO₂Gas sensor, external power supply, 3rd resistor, Four resistance, the 5th resistance, the 6th resistance, first comparator, the second comparator, third comparator, the first light emitting diode, second Light emitting diode, third light emitting diode, the 7th resistance, the 8th resistance and the 9th resistance；

The battery positive voltage connects CO by first switch₂The input terminal of gas sensor, the cathode ground connection of accumulator, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance, first ratio have been sequentially connected in series between external power supply and ground Compared with the common end that the in-phase input end of device connects 3rd resistor and the 4th resistance, the inverting input of first comparator connects CO₂ The signal output end of gas sensor, the anode of output end the first light emitting diode of connection of first comparator, first luminous two The cathode of pole pipe connects external power supply by the 7th resistance；

The in-phase input end of second comparator connects the common end of the 4th resistance and the 5th resistance, the second comparator Inverting input connects CO₂The signal output end of gas sensor；The output end of second comparator connects the second light emitting diode Anode, the cathode of the second light emitting diode passes through the 8th resistance and connects external power supply；

The in-phase input end of the third comparator connects the common end of the 5th resistance and the 6th resistance, third comparator Inverting input connects CO₂The output end of the signal output end of gas sensor, third comparator connects third light emitting diode Anode, the cathode of third light emitting diode passes through the 9th resistance and connects external power supply；The CO₂The signal of gas sensor is defeated Outlet is CO₂The output end of content indicating circuit.

Further, the CO₂Content detection circuit further includes warning circuit, and the warning circuit includes：Second amplification Device, the 4th comparator, reference voltage, NPN triode, the tenth resistance, integrated chip KD9561, eleventh resistor, integrated chip LM386, the 4th capacitance and power amplifier；

The input terminal of second amplifier is the input terminal of warning circuit, and connects CO₂The output of content indicating circuit End, the output end of second amplifier connect the in-phase input end of the 4th comparator, and the inverting input of the 4th comparator connects Meet reference voltage, the base stage of the output end connection NPN triode of the 4th comparator, the emitter ground connection of NPN triode, NPN tri- The input terminal of the collector connection integrated chip KD9561 of pole pipe, the feeder ear of integrated chip KD9561 are connected by the tenth resistance The output end of external power supply, integrated chip KD9561 is grounded by eleventh resistor, the third pin of integrated chip LM386 and The contact portion of 11 resistance, eleventh resistor are slide rheostat, and the second pin of integrated chip LM386 and the 4th pin connect 6th pin on ground, integrated chip LM386 connects external power supply, and the 5th pin of integrated chip LM386 is connected by the 4th capacitance Connect the first end of power amplifier, the second end ground connection of power amplifier.

Thirteenth resistor and third capacitance of the 5th pin of the integrated chip LM386 also by being connected in series with.

The 5th capacitance, the 5th electricity are also associated between the 6th pin and external power supply of the integrated chip LM386 The second end of appearance is grounded.

The first switch and CO₂First resistor and second is also connected in series between the input terminal of gas sensor to open It closes, the both ends of the first resistor are also connected in parallel to the first amplifier, the output end and second switch of first amplifier Control connection.

The CO₂Electrostatic discharge protection circuit, the electrostatic discharge protection circuit are also associated with after the signal output end of gas sensor Including external power supply, the first PMOS tube, the second PMOS tube, the first NMOS tube and the second NMOS tube；The CO₂Gas sensor Signal output end connects external power supply, the CO with the second PMOS tube by concatenated first PMOS tube₂The letter of gas sensor Number output end also passes through concatenated first NMOS tube and the second NMOS tube ground connection.

Further, it is also associated with the first capacitance between the grid and the grid of the second PMOS tube of first PMOS tube, It is also associated with the second capacitance between the grid and the grid of the second NMOS tube of first NMOS tube.

The utility model has the beneficial effects that：By the detection device, the CO in natural gas can be fast and effectively detected₂ Gas, while CO₂CO can be explicitly indicated in content indicating circuit₂Concentration scale be easy to by the light emitting diode of different colours Observation, by warning circuit, works as CO₂The CO in staff's natural gas is prompted when content superthreshold₂Gas is excessive, safely may be used It leans on, improves the safety of gas-monitoring, the device is easy to operate, and analyze speed is fast, and accuracy of detection is high.

Description of the drawings

Fig. 1 is a kind of natural gas CO of the utility model₂The CO of content detection device₂The circuit theory of content detection circuit Figure.

Reference numeral：K1- first switches, R1- first resistors, K2- second switches, the first amplifiers of A1-, R2- CO₂Gas Body sensor, the first PMOS tube of VCC-external power supply, P1-, the second PMOS tube of P2-, the first NMOS tubes of N1-, the 2nd NMOS of N2- Pipe, the first capacitances of C1-, the second capacitances of C2-, R3- 3rd resistors, the 4th resistance of R4-, the 5th resistance of R5-, the 6th resistance of R6-, U1- first comparators, the second comparators of U2-, U3- third comparators, the first light emitting diodes of L1-, the second light-emitting diodes of L2- Pipe, L3- third light emitting diodes, the 7th resistance of R7-, the 8th resistance of R8-, the 9th resistance of R9-, the second amplifiers of A2-, U4- the Four comparators, U0- reference voltages, T1-NPN triodes, the tenth resistance of R10-, R11- eleventh resistors, the 4th capacitances of C4-, BP Power amplifier, R13- thirteenth resistors, C3- third capacitances, the 5th capacitances of C5-.

Specific implementation mode

More detailed description is done to the embodiment of the utility model below in conjunction with attached drawing and reference numeral, makes to be familiar with ability The technology people in domain can implement according to this after studying this specification carefully.It should be appreciated that specific embodiment described herein is only solving The utility model is released, is not used to limit the utility model.

A kind of natural gas CO₂Content detection device, including：CO₂Gas sensor further includes：CO₂Content detection circuit, institute State CO₂Content detection circuit includes CO₂Content indicating circuit；The CO₂Content indicating circuit includes：Accumulator, first switch K1、CO₂Gas sensor R2, external power supply VCC, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, One comparator U1, the second comparator U2, third comparator U3, the first light emitting diode L1, the second light emitting diode L2, third hair Optical diode L3, the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9；

The battery positive voltage passes through first switch K1 connections CO₂The input terminal of gas sensor R2, the cathode of accumulator Ground connection, has been sequentially connected in series 3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and the 6th between external power supply VCC and ground The common end of in-phase input end connection the 3rd resistor R3 and the 4th resistance R4 of resistance R6, the first comparator U1, the first ratio Inverting input compared with device U1 connects CO₂The signal output end of gas sensor R2, the output end connection the of first comparator U1 The cathode of the anode of one light emitting diode L1, the first light emitting diode L1 passes through the 7th resistance R7 connection external power supplys VCC；

The in-phase input end of the second comparator U2 connects the common end of the 4th resistance R4 and the 5th resistance R5, the second ratio Inverting input compared with device U2 connects CO₂The signal output end of gas sensor R2；The output end connection the of second comparator U2 The cathode of the anode of two light emitting diode L2, the second light emitting diode L2 passes through the 8th resistance R8 connection external power supplys VCC；

The in-phase input end of the third comparator R6 connects the common end of the 5th resistance R5 and the 6th resistance R6, third ratio Inverting input compared with device R6 connects CO₂The signal output end of gas sensor R2, the output end connection the of third comparator R6 The cathode of the anode of three light emitting diode L3, third light emitting diode L3 passes through the 9th resistance R9 connection external power supplys VCC；It is described CO₂The signal output end of gas sensor R2 is CO₂The output end of content indicating circuit；First comparator U1, the second comparator U2 The threshold voltage value after a partial pressure is received with the in-phase end of third comparator U3, is at this time the voltage value of three grades, Wherein, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6 are divider resistance, first comparator U1, second The reverse side of comparator U2 and third comparator U3 receive CO₂The voltage value of gas sensor R2 outputs, voltage value point at this time It is not compared with the voltage value of three grades, if voltage value is more than the voltage value of wherein any one grade, the grade The corresponding comparator of voltage value exports low level, and corresponding light emitting diode is lit, according to the light emitting diode lighted Color can determine whether the CO₂The color of the range of gas concentration, the first light emitting diode L1 is blue, the second light-emitting diodes The color of pipe L2 is yellow, and the color of third light emitting diode L3 is red, by the light emitting diode of different colours, convenient for seeing It examines, cheer and bright, the CO₂Content indicating circuit is simple in structure, and circuit stability is reliable, and work is sensitive, and detection is rapid, detects simultaneously Precision is high.

The CO₂Content detection circuit further includes warning circuit, and the warning circuit includes：Second amplifier A2, the 4th Comparator U4, it reference voltage U0, NPN triode T1, the tenth resistance R10, integrated chip KD9561, eleventh resistor R11, integrates Chip LM386, the 4th capacitance C4 and power amplifier BP；

The input terminal of the second amplifier A2 is the input terminal of warning circuit, and connects CO₂Content indicating circuit it is defeated Outlet, the output end of the second amplifier A2 connect the in-phase input end of the 4th comparator U4, the reverse phase of the 4th comparator U4 Input terminal connects the base stage of the output end connection NPN triode T1 of reference voltage U0, the 4th comparator U4, NPN triode T1's Emitter is grounded, the input terminal of the collector connection integrated chip KD9561 of NPN triode T1, the power supply of integrated chip KD9561 End is grounded by the output end of the tenth resistance R10 connection external power supply VCC, integrated chip KD9561 by eleventh resistor R11, The contact portion of the third pin and eleventh resistor R11 of integrated chip LM386, eleventh resistor R11 are slide rheostat, collection It is grounded at the second pin of chip LM386 and the 4th pin, the 6th pin of integrated chip LM386 connects external power supply VCC, collection Pass through the first end of the 4th capacitance C4 connection power amplifiers BP, the second end ground connection of power amplifier BP at the 5th pin of chip LM386；Chip Each pin defined by the specification disclosed in its production firm, the CO₂The voltage value that gas sensor R2 is detected becomes Change small, after the second amplifier A2 amplification, which is input to the in-phase end of the 4th comparator U4, with reference voltage U0 into Row compares, which is alarm threshold value；If voltage value is higher than reference voltage value, the 4th comparator U4 exports high level, NPN triode T1 is connected at this time, and audio chip KD9561 exports audio electric signal after being powered on, which is input to The audio-frequency power amplifier that integrated chip LM386 is constituted makes power amplifier BP beep to alarm；Otherwise NPN triode T1 is not Conducting, power amplifier BP will not alarm；Wherein, eleventh resistor R11 is variable resistance, is used for the adjusting of volume, and the tenth resistance R10 is Current-limiting resistance, the 4th capacitance C4 are decoupling filter capacitor.

Thirteenth resistor R13 and third capacitance C3 of the 5th pin of the integrated chip LM386 also by being connected in series with； Thirteenth resistor R13 is loaded for reducing audio signal, and protection circuit, third capacitance C3 is filter action isolated DC, only Audio is allowed to pass through.

It is also associated with the 5th capacitance C5 between the 6th pin and external power supply VCC of the integrated chip LM386, described The second end of five capacitance C5 is grounded；The 5th capacitance C5 is filter capacitor, and the high-frequency components in input signal are filtered out, Chip is protected, the stability of circuit work is improved.

The first switch K1 and CO₂First resistor R1 and are also connected in series between the input terminal of gas sensor R2 The both ends of two switch K2, the first resistor R1 are also connected in parallel to the first amplifier A1, the output of the first amplifier A1 End is connected with second switch K2 controls；The first resistor R1, second switch K2 and the first amplifier A1, which are constituted, inhibits surge electricity Road, when surge comes, control second switch K2 is closed, and protects circuit.

The CO₂Electrostatic discharge protection circuit, the electrostatic protection electricity are also associated with after the signal output end of gas sensor R2 Road includes external power supply VCC, the first PMOS tube P1, the second PMOS tube P2, the first NMOS tube N1 and the second NMOS tube N2；It is described CO₂The signal output end of gas sensor R2 passes through concatenated first PMOS tube P1 and the second PMOS tube P2 connection external power supplys VCC, the CO₂The signal output end of gas sensor R2 is also connect by concatenated first NMOS tube N1 and the second NMOS tube N2 Ground；The electrostatic discharge protection circuit is exactly to improve pressure voltage, when human contact's chip, transient voltage to eliminate electrostatic More than circuit normal working voltage when, PMOS tube and NMOS tube puncture simultaneously, provide access for transient current, make internal circuit Overheat from overvoltage breakdown or excess electric current is burnt, and two are formed using two PMOS tube in parallel and two NMOS tubes in parallel Pole is protected, and increases the safety of protection so that the circuit is more reliable and more stable.

The first capacitance C1 is also associated between the grid and the grid of the second PMOS tube P2 of the first PMOS tube P1, it is described The second capacitance C2 is also associated between the grid of first NMOS tube N1 and the grid of the second NMOS tube N2；The first capacitance C1 and Second capacitance C2 punctures metal-oxide-semiconductor as early as possible for improving coupling speed.

The above content is the further descriptions made to the utility model in conjunction with specific preferred embodiment, cannot recognize Determine specific embodiment of the present utility model and is confined to these explanations.For the common skill of the utility model technical field For art personnel, the other embodiment obtained in the case where not departing from the technical solution of the utility model should be included in this practicality In novel protection domain.

Claims (7)

1. a kind of natural gas CO₂Content detection device, it is characterised in that：Including：CO₂Gas sensor further includes：CO₂Content is examined Slowdown monitoring circuit, the CO₂Content detection circuit includes CO₂Content indicating circuit；The CO₂Content indicating circuit includes：Accumulator, First switch（K1）、CO₂Gas sensor（R2）, external power supply（VCC）, 3rd resistor（R3）, the 4th resistance（R4）, the 5th electricity Resistance（R5）, the 6th resistance（R6）, first comparator（U1）, the second comparator（U2）, third comparator（U3）, the first light-emitting diodes Pipe（L1）, the second light emitting diode（L2）, third light emitting diode（L3）, the 7th resistance（R7）, the 8th resistance（R8）With the 9th Resistance（R9）；

The battery positive voltage passes through first switch（K1）Connect CO₂Gas sensor（R2）Input terminal, the cathode of accumulator connects Ground, external power supply（VCC）3rd resistor has been sequentially connected in series between ground（R3）, the 4th resistance（R4）, the 5th resistance（R5） With the 6th resistance（R6）, the first comparator（U1）In-phase input end connect 3rd resistor（R3）With the 4th resistance（R4）'s Common end, first comparator（U1）Inverting input connect CO₂Gas sensor（R2）Signal output end, first comparator （U1）Output end connect the first light emitting diode（L1）Anode, the first light emitting diode（L1）Cathode pass through the 7th resistance （R7）Connect external power supply（VCC）；

Second comparator（U2）In-phase input end connect the 4th resistance（R4）With the 5th resistance（R5）Common end, second Comparator（U2）Inverting input connect CO₂Gas sensor（R2）Signal output end；Second comparator（U2）Output The second light emitting diode of end connection（L2）Anode, the second light emitting diode（L2）Cathode pass through the 8th resistance（R8）Connection is outer Connect power supply（VCC）；

The third comparator（R6）In-phase input end connect the 5th resistance（R5）With the 6th resistance（R6）Common end, third Comparator（R6）Inverting input connect CO₂Gas sensor（R2）Signal output end, third comparator（R6）Output End connection third light emitting diode（L3）Anode, third light emitting diode（L3）Cathode pass through the 9th resistance（R9）Connection is outer Connect power supply（VCC）；The CO₂Gas sensor（R2）Signal output end be CO₂The output end of content indicating circuit.

2. a kind of natural gas CO as described in claim 1₂Content detection device, it is characterised in that：The CO₂Content detection electricity Road further includes warning circuit, and the warning circuit includes：Second amplifier（A2）, the 4th comparator（U4）, reference voltage（U0）、 NPN triode（T1）, the tenth resistance（R10）, integrated chip KD9561, eleventh resistor（R11）, integrated chip LM386, the 4th Capacitance（C4）And power amplifier（BP）；

Second amplifier（A2）Input terminal be warning circuit input terminal, and connect CO₂The output of content indicating circuit End, second amplifier（A2）Output end connect the 4th comparator（U4）In-phase input end, the 4th comparator（U4）'s Inverting input connects reference voltage（U0）, the 4th comparator（U4）Output end connect NPN triode（T1）Base stage, NPN Triode（T1）Emitter ground connection, NPN triode（T1）Collector connection integrated chip KD9561 input terminal, integrate core The feeder ear of piece KD9561 passes through the tenth resistance（R10）Connect external power supply（VCC）, the output end of integrated chip KD9561 passes through Eleventh resistor（R11）Ground connection, the third pin and eleventh resistor of integrated chip LM386（R11）Contact portion, the 11st Resistance（R11）For slide rheostat, the second pin of integrated chip LM386 and the 4th pin ground connection, the of integrated chip LM386 Six pins connect external power supply（VCC）, the 5th pin of integrated chip LM386 passes through the 4th capacitance（C4）Connect power amplifier（BP）'s First end, power amplifier（BP）Second end ground connection.

3. a kind of natural gas CO as claimed in claim 2₂Content detection device, it is characterised in that：The integrated chip LM386 Thirteenth resistor of the 5th pin also by being connected in series with（R13）With third capacitance（C3）.

4. a kind of natural gas CO as claimed in claim 2₂Content detection device, it is characterised in that：The integrated chip LM386 The 6th pin and external power supply（VCC）Between be also associated with the 5th capacitance（C5）, the 5th capacitance（C5）Second termination Ground.

5. a kind of natural gas CO as described in claim 1₂Content detection device, it is characterised in that：The first switch（K1）With CO₂Gas sensor（R2）Input terminal between be also connected in series with first resistor（R1）And second switch（K2）, described first Resistance（R1）Both ends be also connected in parallel to the first amplifier（A1）, first amplifier（A1）Output end and second switch （K2）Control connection.

6. a kind of natural gas CO as described in claim 1₂Content detection device, it is characterised in that：The CO₂Gas sensor （R2）Signal output end after be also associated with electrostatic discharge protection circuit, the electrostatic discharge protection circuit includes external power supply（VCC）, first PMOS tube（P1）, the second PMOS tube（P2）, the first NMOS tube（N1）With the second NMOS tube（N2）；The CO₂Gas sensor （R2）Signal output end pass through concatenated first PMOS tube（P1）With the second PMOS tube（P2）Connect external power supply（VCC）, institute State CO₂Gas sensor（R2）Signal output end also pass through concatenated first NMOS tube（N1）With the second NMOS tube（N2）It connects Ground.

7. a kind of natural gas CO as claimed in claim 6₂Content detection device, it is characterised in that：First PMOS tube（P1） Grid and the second PMOS tube（P2）Grid between be also associated with the first capacitance（C1）, first NMOS tube（N1）Grid With the second NMOS tube（N2）Grid between be also associated with the second capacitance（C2）.