CN203241369U - Portable combustible gas detection instrument - Google Patents
Portable combustible gas detection instrument Download PDFInfo
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- CN203241369U CN203241369U CN 201320248331 CN201320248331U CN203241369U CN 203241369 U CN203241369 U CN 203241369U CN 201320248331 CN201320248331 CN 201320248331 CN 201320248331 U CN201320248331 U CN 201320248331U CN 203241369 U CN203241369 U CN 203241369U
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Abstract
The utility model discloses a portable combustible gas detection instrument, belongs to an alarming device which can respond when a certain situation occurs, and in particular relates to a combustible gas detection alarming device. The portable combustible gas detection instrument comprises a direct current-direct current power supply, a gas sensitive element and a detection circuit, and is characterized in that a signal processing circuit with a combustible gas sensor is connected with a singlechip STM32F103 as a central processing unit; the central processing unit is also connected with a gas sampling circuit, a key signal acquisition circuit, an acoustic alarm circuit, a liquid crystal display circuit, a use state indication circuit and a clock circuit; an air breathing device is additionally arranged at a probe part. According to the detection instrument, by using the singlechip as the central processing unit, the application of peripheral independent element devices is reduced, and a gas sampling circuit can be used for actively sampling gas to be detected so as to conveniently detect narrow gaps and pipelines. According to the concentration indication on a liquid crystal of the instrument, whether the combustible gas leaks or not can be conveniently determined.
Description
Technical field
The utility model belongs to the warning device, particularly flammable gas detecting alarm device to stable condition response.
Background technology
Rapid expansion along with the inflammable gas application, when the production of giving people, life bring great convenience, because its inflammable and explosive characteristic, so that the incidence of accident also improved accordingly, people's safety of life and property has been consisted of great threat.For preventing trouble before it happens, the leakage of inflammable gas detected just seem very necessary.Should see simultaneously, portability and the ease for use of corresponding detecting instrument, implementation effect to testing has very important effect, therefore a kind of use simple, easy to carry, precision is high, the detecting instrument of longevity of service, must have broad application prospects.
Existing Portable combustible gas detector adopts the design of feeling of passivity gas, need to the deep that elongated probe is deep into the monitored site be installed at detector and just can detect, and some complex-shaped position probe stretches into difficulty.
The utility model content
The purpose of this utility model provides a kind ofly can initiatively carry out gas sampling, and numeral shows the leakage concentration of inflammable gas, and in time carries out the technical scheme of the detecting instrument of sound and light alarm.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of Portable combustible gas detector, comprise DC-DC power supply, gas sensor, testing circuit, it is characterized in that: the signal processing circuit that combustible gas sensor is housed is connected on the single-chip microcomputer STM32F103 as central processing unit, central processing unit is also connecting gas sampling circuit, keying signal collection circuit, the audible alarm circuit, liquid crystal display circuit uses condition indication circuit and clock circuit
Described installation of sensors is in the sensor probe with air admission hole, the sensor probe bottom is provided with the air intake duct interface, the air intake duct other end that is installed on the air intake duct interface is connected with asepwirator pump, asepwirator pump is controlled by the asepwirator pump driving circuit, described asepwirator pump driving circuit, an end of asepwirator pump is connected to anode by resistance R 41, the collector of another termination triode Q5, the direct ground connection of the emitter of Q5, base stage are connected to 35 pin of single-chip microcomputer by R42.
The 3.3V reduction voltage circuit of described DC-DC power supply for using LM1117 chip and E5, E6 to form, the direct ground connection of E5 one end, the other end of E5 connects power input, and the pin 3 of access MCP1702-5 chip, LM1117 chip pin 1 direct ground connection, pin 2 connect E6 composition output terminal and are connected to liquid crystal display circuit, clock circuit, single-chip microcomputer feed circuit; MCP1702-5 chip and E7, the 5V reduction voltage circuit that E8 forms, the end of E7 connects power input, and receive the pin 2 of MCP1702-5 chip, the other end ground connection of E7, the pin 1 direct ground connection of MCP1702-5 chip, the end composition output terminal that pin 3 connects E8 is connected to clock circuit, the gas sampling circuit, the other end ground connection of E8, MCP1702-5 chip and C2, the 5V reduction voltage circuit that C3 forms, the end of C3 connects power input, and receives the pin 2 of MCP1702-5 chip, the other end ground connection of C3, the end composition output terminal that the pin 1 direct ground connection of MCP1702-5 chip, pin 3 connect C2 is connected to gas sensor, the other end ground connection of C2.
Described gas sampling circuit and signal processing circuit, the signal end of semiconductor transducer JYZ4-B is contact resistance R5, R6 respectively, the other end of R5 connects 15 pin of single-chip microcomputer STM32F103, the other end of R6 is contact resistance R2 and R7 respectively, the other end ground connection of R7, the pin 8 of IC1 meets 5V, pin 4 ground connection, pin 1 connecting resistance R28, R1, the R28 other end is connected to the pin 14 of single-chip microcomputer, and the pin 2 of IC1 meets the other end and the R3 of R1, C1, the other end of R3 connects the pin 20 of single-chip microcomputer, and the pin 3 of IC1 connects the other end of C1 and resistance R 2, R4, the other end ground connection of R4.
Described keying signal collection circuit, 57 pin and 58 pin of button K1, K2 access single-chip microcomputer, the other end ground connection of K1, K2, button K3 one end directly connects battery, and the positive pole of another termination D1 is connected to 61 pin of single-chip microcomputer again by resistance R 35.
Described audible alarm circuit, the positive termination power of hummer BUZZER, the collector of another termination Q4, the grounded emitter of Q4, the pin 34 of single-chip microcomputer is connected to the base stage of Q4 by resistance R 31.
Described liquid crystal display circuit, be connected to pin 19, pin 18, pin 17, pin 16, pin 15, pin 14, pin 13, pin 12, pin 11, pin 10, pin 9, pin 8, the pin 7 of IC1 by 8 pin, 9 pin, 10 pin, 11 pin, 24 pin, 25 pin, 37 pin, 38 pin, 39 pin, 40 pin, 51 pin, 52 pin, 53 pin of single-chip microcomputer, drive liquid crystal, liquid crystal back light circuit is connected to the base stage of Q6 by resistance R 34 by 33 pin of single-chip microcomputer, the grounded emitter of Q6, the collector of Q6 connects LCD backlight.
Described use condition indication circuit, the pin 26 of single-chip microcomputer, pin 23 are connected to the anode of monochromatic pilot lamp LED2, LED3 by resistance R 43, R44, the plus earth of LED2, LED3, the anode of LED1 is connected to the 2 pin output terminals of LM1117, plus earth by R46.
Described clock circuit, be comprised of IC4, IC5 and peripheral circuit thereof, the pin 8 of IC5 connects power supply, and pin 6, pin 5 connect respectively pin 6, the pin 5 of IC4, pin 4 ground connection of IC5, pin 3 connects the 3V electronics, electronics other end ground connection, and the pin 1 of IC5, pin 2 connect respectively the two ends of JZ, the pin 1 of IC4, pin 2, pin 3, pin 4 direct ground connection, pin 8 connects C6 and power supply, C6 other end ground connection, and pin 7 connects single-chip microcomputer 62 pin.
At first press " switch " key K3 when the detecting instrument that uses the utility model to provide detects, make the Q2 conducting, the DC-DC power supply is started working, output 5V voltage, and single-chip microcomputer STM32F103 starts working.Detect the time that K3 presses, after 3 seconds, the pin 59 output high level of single-chip microcomputer, control Q3 conducting, instrument begins preheating, and the at this moment disconnection of K3 can not affect the work of instrument again.If K3 disconnected before 3 seconds, then instrument quits work because of outage.After preheating is complete, fan is started working, by air intake duct the transducer room that extraneous gas sucks in the instrument is detected, 15 pin that sensor signal voltage is at first sent into single-chip microcomputer STM32F103 carry out the AD sampling, judge according to sampled value whether sensor exists fault.If when having fault to occur (sensor signal end and 5V or ground short circuit), the corresponding voltage on 15 pin is nearly 5V or 0V; And this voltage and increases along with the increase of combustable gas concentration between 2.5～3.0V when normal.Have fault then to light malfunction indicator lamp, hummer sends trouble back tone simultaneously.During non-fault, IC1 amplifies sensor signal, and the result is sent into 14 pin of single-chip microcomputer, after the single-chip microcomputer analyzing and processing numeral is presented on the liquid crystal, if meet or exceed alarm set point, instrument will send the sound and light alarm signal.The instrument liquid crystal shows in real time to the electric weight of battery, crosses when low when cell voltage, and battery symbol is empty, and per minute rings and once is interrupted prompting sound simultaneously; Continue to use such as the user, when the lower voltage of battery arrived the protection value, instrument was with autoshutdown, with the protection battery.Also show the contents such as gaseous species, time on the liquid crystal, and cooperate button to carry out the menu operations such as self check, alarm set point adjustment, demarcation, zeroing, setting-up time.For the convenience of using, instrument is ad hoc " keying " and " zeroing " key K1, K2.Long tenure of use when instrument, in the air of cleaning, when the sensor numeral had drift, length was pressed " zeroing " key, instrument automatic zero set (AZS).
The beneficial effects of the utility model are that detecting device uses single-chip microcomputer to greatly reduce the use of peripheral independent entry device as central processing unit, make compact equipment, volume little, easy to use; The gas sampling circuit can initiatively be sampled to gas to be measured, and is special in unapproachable places of instrument such as narrow gap, pipelines, detects easily; Use equipment only needing when inflammable gas detects according to the indication of the concentration on the instrument liquid crystal to carry out, and just can judge easily the leakage that has or not inflammable gas, even find leakage point, thereby greatly improve detection efficiency and quality.
Description of drawings
Fig. 1 is structure block diagram of the present utility model,
Fig. 2 is CPU module circuit diagram among Fig. 1,
Fig. 3 is DC-DC power module circuitry synoptic diagram among Fig. 1,
Fig. 4 is audible alarm circuit module circuit diagram among Fig. 1,
Fig. 5 is liquid crystal display circuit modular circuit synoptic diagram among Fig. 1,
Fig. 6 is gas sampling processing circuit module circuit diagram among Fig. 1,
Fig. 7 is clock circuit modular circuit synoptic diagram among Fig. 1,
Fig. 8 is asepwirator pump driver module circuit diagram among Fig. 1,
Fig. 9 is keying signal collection circuit and the state of use display module circuit diagram among Fig. 1,
Figure 10 is the utility model active inspiration part-structure synoptic diagram.
Among the figure, 1. combustible gas sensor, 2. lithium battery, 3. gas sampling treatment circuit, 4.DC-DC power supply, 5. central processing unit, 6. clock circuit 7. uses condition indication circuit, 8. keying signal collection circuit, 9. audible alarm circuit, 10. liquid crystal display circuit, 11. sensor probes, 12. air admission hole, 13. sensors, 14. air intake duct interfaces, 15. shell, 16. air intake ducts, 17. asepwirator pumps.
Embodiment
Embodiment of the present utility model is, as shown in the figure:
Described sensor 13 is installed in the sensor probe 11 with air admission hole 12, the sensor probe bottom is provided with air intake duct and connects 14, air intake duct 16 other ends that are installed on the air intake duct interface are connected with asepwirator pump 17, asepwirator pump is controlled by the asepwirator pump driving circuit, described asepwirator pump driving circuit, an end of asepwirator pump is connected to anode by resistance R 41, the collector of another termination triode Q5, the direct ground connection of the emitter of Q5, base stage are connected to 35 pin of single-chip microcomputer by R42.
The 3.3V reduction voltage circuit of described DC-DC power supply for using LM1117 chip and E5, E6 to form, the direct ground connection of E5 one end, the other end of E5 connects power input, and the pin 3 of access MCP1702-5 chip, LM1117 chip pin 1 direct ground connection, pin 2 connect E6 composition output terminal and are connected to liquid crystal display circuit, clock circuit, single-chip microcomputer feed circuit; MCP1702-5 chip and E7, the 5V reduction voltage circuit that E8 forms, the end of E7 connects power input, and receive the pin 2 of MCP1702-5 chip, the other end ground connection of E7, the pin 1 direct ground connection of MCP1702-5 chip, the end composition output terminal that pin 3 connects E8 is connected to clock circuit, the gas sampling circuit, the other end ground connection of E8, MCP1702-5 chip and C2, the 5V reduction voltage circuit that C3 forms, the end of C3 connects power input, and receives the pin 2 of MCP1702-5 chip, the other end ground connection of C3, the end composition output terminal that the pin 1 direct ground connection of MCP1702-5 chip, pin 3 connect C2 is connected to gas sensor, the other end ground connection of C2.
Described gas sampling circuit and signal processing circuit, the signal end of semiconductor transducer JYZ4-B is contact resistance R5, R6 respectively, the other end of R5 connects 15 pin of single-chip microcomputer STM32F103, the other end of R6 is contact resistance R2 and R7 respectively, the other end ground connection of R7, the pin 8 of IC1 meets 5V, pin 4 ground connection, pin 1 connecting resistance R28, R1, the R28 other end is connected to the pin 14 of single-chip microcomputer, and the pin 2 of IC1 meets the other end and the R3 of R1, C1, the other end of R3 connects the pin 20 of single-chip microcomputer, and the pin 3 of IC1 connects the other end of C1 and resistance R 2, R4, the other end ground connection of R4.
Described keying signal collection circuit, 57 pin and 58 pin of button K1, K2 access single-chip microcomputer, the other end ground connection of K1, K2, button K3 one end directly connects battery, and the positive pole of another termination D1 is connected to 61 pin of single-chip microcomputer again by resistance R 35.
Described audible alarm circuit, the positive termination power of hummer BUZZER, the collector of another termination Q4, the grounded emitter of Q4, the pin 34 of single-chip microcomputer is connected to the base stage of Q4 by resistance R 31.
Described liquid crystal display circuit, be connected to pin 19, pin 18, pin 17, pin 16, pin 15, pin 14, pin 13, pin 12, pin 11, pin 10, pin 9, pin 8, the pin 7 of IC1 by 8 pin, 9 pin, 10 pin, 11 pin, 24 pin, 25 pin, 37 pin, 38 pin, 39 pin, 40 pin, 51 pin, 52 pin, 53 pin of single-chip microcomputer, drive liquid crystal, liquid crystal back light circuit is connected to the base stage of Q6 by resistance R 34 by 33 pin of single-chip microcomputer, the grounded emitter of Q6, the collector of Q6 connects LCD backlight.
Described use condition indication circuit, the pin 26 of single-chip microcomputer, pin 23 are connected to the anode of monochromatic pilot lamp LED2, LED3 by resistance R 43, R44, the plus earth of LED2, LED3, the anode of LED1 is connected to the 2 pin output terminals of LM1117, plus earth by R46.
Described clock circuit, be comprised of IC4, IC5 and peripheral circuit thereof, the pin 8 of IC5 connects power supply, and pin 6, pin 5 connect respectively pin 6, the pin 5 of IC4, pin 4 ground connection of IC5, pin 3 connects the 3V electronics, electronics other end ground connection, and the pin 1 of IC5, pin 2 connect respectively the two ends of JZ, the pin 1 of IC4, pin 2, pin 3, pin 4 direct ground connection, pin 8 connects C6 and power supply, C6 other end ground connection, and pin 7 connects single-chip microcomputer 62 pin.
At first press " switch " key K3 when the detecting instrument that uses the utility model to provide detects, make the Q2 conducting, the DC-DC power supply is started working, output 5V voltage, and single-chip microcomputer STM32F103 starts working.Detect the time that K3 presses, after 3 seconds, the pin 59 output high level of single-chip microcomputer, control Q3 conducting, instrument begins preheating, and the at this moment disconnection of K3 can not affect the work of instrument again.If K3 disconnected before 3 seconds, then instrument quits work because of outage.After preheating is complete, fan is started working, by air intake duct the transducer room that extraneous gas sucks in the instrument is detected, 15 pin that sensor signal voltage is at first sent into single-chip microcomputer STM32F103 carry out the AD sampling, judge according to sampled value whether sensor exists fault.If when having fault to occur (sensor signal end and 5V or ground short circuit), the corresponding voltage on 15 pin is nearly 5V or 0V; And this voltage and increases along with the increase of combustable gas concentration between 2.5～3.0V when normal.Have fault then to light malfunction indicator lamp, hummer sends trouble back tone simultaneously.During non-fault, IC1 amplifies sensor signal, and the result is sent into 14 pin of single-chip microcomputer, after the single-chip microcomputer analyzing and processing numeral is presented on the liquid crystal, if meet or exceed alarm set point, instrument will send the sound and light alarm signal.The instrument liquid crystal shows in real time to the electric weight of battery, crosses when low when cell voltage, and battery symbol is empty, and per minute rings and once is interrupted prompting sound simultaneously; Continue to use such as the user, when the lower voltage of battery arrived the protection value, instrument was with autoshutdown, with the protection battery.Also show the contents such as gaseous species, time on the liquid crystal, and cooperate button to carry out the menu operations such as self check, alarm set point adjustment, demarcation, zeroing, setting-up time.For the convenience of using, instrument is ad hoc " keying " and " zeroing " key K1, K2.Long tenure of use when instrument, in the air of cleaning, when the sensor numeral had drift, length was pressed " zeroing " key, instrument automatic zero set (AZS).
The beneficial effects of the utility model are that detecting device uses single-chip microcomputer to greatly reduce the use of peripheral independent entry device as central processing unit, make compact equipment, volume little, easy to use; The gas sampling circuit can initiatively be sampled to gas to be measured, and is special in unapproachable places of instrument such as narrow gap, pipelines, detects easily; Use equipment only needing when inflammable gas detects according to the indication of the concentration on the instrument liquid crystal to carry out, and just can judge easily the leakage that has or not inflammable gas, even find leakage point, thereby greatly improve detection efficiency and quality.
Claims (8)
1. Portable combustible gas detector, comprise DC-DC power supply, gas sensor, testing circuit, it is characterized in that: the signal processing circuit that combustible gas sensor is housed is connected on the single-chip microcomputer STM32F103 as central processing unit, central processing unit is also connecting gas sampling circuit, keying signal collection circuit, the audible alarm circuit, liquid crystal display circuit uses condition indication circuit and clock circuit
Described installation of sensors is in the sensor probe with air admission hole, the sensor probe bottom is provided with the air intake duct interface, the air intake duct other end that is installed on the air intake duct interface is connected with asepwirator pump, asepwirator pump is controlled by the asepwirator pump driving circuit, described asepwirator pump driving circuit, an end of asepwirator pump is connected to anode by resistance R 41, the collector of another termination triode Q5, the direct ground connection of the emitter of Q5, base stage are connected to 35 pin of single-chip microcomputer by R42.
2. determined Portable combustible gas detector according to claim 1, it is characterized in that: the 3.3V reduction voltage circuit of described DC-DC power supply for using LM1117 chip and E5, E6 to form, the direct ground connection of E5 one end, the other end of E5 connects power input, and the pin 3 of access MCP1702-5 chip, LM1117 chip pin 1 direct ground connection, pin 2 connect E6 composition output terminal and are connected to liquid crystal display circuit, clock circuit, single-chip microcomputer feed circuit; MCP1702-5 chip and E7, the 5V reduction voltage circuit that E8 forms, the end of E7 connects power input, and receive the pin 2 of MCP1702-5 chip, the other end ground connection of E7, the pin 1 direct ground connection of MCP1702-5 chip, the end composition output terminal that pin 3 connects E8 is connected to clock circuit, the gas sampling circuit, the other end ground connection of E8, MCP1702-5 chip and C2, the 5V reduction voltage circuit that C3 forms, the end of C3 connects power input, and receives the pin 2 of MCP1702-5 chip, the other end ground connection of C3, the end composition output terminal that the pin 1 direct ground connection of MCP1702-5 chip, pin 3 connect C2 is connected to gas sensor, the other end ground connection of C2.
3. determined Portable combustible gas detector according to claim 1, it is characterized in that: described gas sampling circuit and signal processing circuit, the signal end of semiconductor transducer JYZ4-B is contact resistance R5 respectively, R6, the other end of R5 connects 15 pin of single-chip microcomputer STM32F103, the other end of R6 is contact resistance R2 and R7 respectively, the other end ground connection of R7, the pin 8 of IC1 meets 5V, pin 4 ground connection, pin 1 connecting resistance R28, R1, the R28 other end is connected to the pin 14 of single-chip microcomputer, the pin 2 of IC1 meets the other end and the R3 of R1, and C1, the other end of R3 connect the pin 20 of single-chip microcomputer, the pin 3 of IC1 connects the other end and the resistance R 2 of C1, R4, the other end ground connection of R4.
4. determined Portable combustible gas detector according to claim 1, it is characterized in that: described keying signal collection circuit, 57 pin and 58 pin of button K1, K2 access single-chip microcomputer, the other end ground connection of K1, K2, button K3 one end directly connects battery, the positive pole of another termination D1 is connected to 61 pin of single-chip microcomputer again by resistance R 35.
5. determined Portable combustible gas detector according to claim 1, it is characterized in that: described audible alarm circuit, the positive termination power of hummer BUZZER, the collector of another termination Q4, the grounded emitter of Q4, the pin 34 of single-chip microcomputer is connected to the base stage of Q4 by resistance R 31.
6. determined Portable combustible gas detector according to claim 1, it is characterized in that: described liquid crystal display circuit, be connected to pin 19, pin 18, pin 17, pin 16, pin 15, pin 14, pin 13, pin 12, pin 11, pin 10, pin 9, pin 8, the pin 7 of IC1 by 8 pin, 9 pin, 10 pin, 11 pin, 24 pin, 25 pin, 37 pin, 38 pin, 39 pin, 40 pin, 51 pin, 52 pin, 53 pin of single-chip microcomputer, drive liquid crystal, liquid crystal back light circuit is connected to the base stage of Q6 by resistance R 34 by 33 pin of single-chip microcomputer, the grounded emitter of Q6, the collector of Q6 connects LCD backlight.
7. determined Portable combustible gas detector according to claim 1, it is characterized in that: described use condition indication circuit, the pin 26 of single-chip microcomputer, pin 23 are connected to the anode of monochromatic pilot lamp LED2, LED3 by resistance R 43, R44, the plus earth of LED2, LED3, the anode of LED1 is connected to the 2 pin output terminals of LM1117, plus earth by R46.
8. determined Portable combustible gas detector according to claim 1, it is characterized in that: described clock circuit is comprised of IC4, IC5 and peripheral circuit thereof, the pin 8 of IC5 connects power supply, pin 6, pin 5 connect respectively pin 6, the pin 5 of IC4, pin 4 ground connection of IC5, and pin 3 connects the 3V electronics, electronics other end ground connection, the pin 1 of IC5, pin 2 connect respectively the two ends of JZ, the pin 1 of IC4, pin 2, pin 3, pin 4 direct ground connection, and pin 8 connects C6 and power supply, C6 other end ground connection, pin 7 connect single-chip microcomputer 62 pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320248331 CN203241369U (en) | 2013-05-09 | 2013-05-09 | Portable combustible gas detection instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320248331 CN203241369U (en) | 2013-05-09 | 2013-05-09 | Portable combustible gas detection instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203241369U true CN203241369U (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320248331 Expired - Fee Related CN203241369U (en) | 2013-05-09 | 2013-05-09 | Portable combustible gas detection instrument |
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| Country | Link |
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| CN (1) | CN203241369U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235009A (en) * | 2013-05-09 | 2013-08-07 | 济南市长清计算机应用公司 | Portable combustible gas detector |
-
2013
- 2013-05-09 CN CN 201320248331 patent/CN203241369U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103235009A (en) * | 2013-05-09 | 2013-08-07 | 济南市长清计算机应用公司 | Portable combustible gas detector |
| CN103235009B (en) * | 2013-05-09 | 2016-03-30 | 济南市长清计算机应用公司 | A kind of using method of Portable combustible gas detector |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 |