CN209894769U - Combustible gas detector - Google Patents
Combustible gas detector Download PDFInfo
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- CN209894769U CN209894769U CN201920097036.4U CN201920097036U CN209894769U CN 209894769 U CN209894769 U CN 209894769U CN 201920097036 U CN201920097036 U CN 201920097036U CN 209894769 U CN209894769 U CN 209894769U
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Abstract
The utility model discloses a combustible gas detector, including setting up at this internal mainboard and the sensor of setting at the mainboard lower extreme, including singlechip, switching power supply module, microprocessor module, storage module, communication module and control module in the mainboard, switching power supply module, microprocessor module, control module's output is connected with the input of singlechip respectively, storage module and RS24S communication module's interface end is connected with the interface end of singlechip, switching power supply module includes switching power supply, main power supply and stand-by power supply. Have real-time supervision, concentration tracking and audible and visual alarm function to combustible gas, also can the urgent processing after equipment such as external air discharge fan reports to the police, accomplish to combustible gas's real-time tracking, discovery promptly handle, it is convenient to survey, shows reliable and stable, shows clearly bright, wholly small and exquisite, is convenient for install in narrow region, realizes the monitoring of the full aspect of gas pipeline, the valve control on the adaptation market of being convenient for.
Description
Technical Field
The utility model relates to a combustible gas detector especially relates to a combustible bus gas detector.
Background
A gas detector is an instrument that detects the concentration of a gas. The instrument is suitable for dangerous places with combustible or toxic gas, and can continuously detect the content of the detected gas in the air within the lower explosion limit for a long time. The device can be widely applied to various industries with combustible or toxic gas such as gas, petrochemical industry, metallurgy, steel, coking, electric power and the like, and is an ideal monitoring instrument for ensuring property and personal safety.
At present, with the wide application of gas, due to the fact that explosion, poisoning, fire and the like caused by gas leakage are endless, unsafe and unstable factors of users are increased to a certain extent, and it is particularly important for gas using units and residential users to select a suitable gas alarm.
SUMMERY OF THE UTILITY MODEL
The utility model discloses have real-time supervision, concentration tracking and audible-visual alarm function to combustible gas, also can the urgent processing after equipment such as external air discharge fan reports to the police, accomplish to combustible gas's real-time tracking, discovery promptly to handle, it is convenient to survey, shows reliable and stable, shows clearly bright, wholly small and exquisite, is convenient for install in narrow area, realizes the monitoring of the full aspect of gas pipeline, the valve control on the adaptation market of being convenient for.
In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a combustible gas detector, is including setting up at this internal mainboard and the sensor of setting at the mainboard lower extreme, the sensor is equipped with the sensor overcoat outward, including singlechip, switching power supply module, microprocessor module, storage module, communication module and control module in the mainboard, switching power supply module, microprocessor module, control module's output are connected with the input of singlechip respectively, storage module and RS24S communication module's interface end all are connected with the interface end of singlechip, the body front end is equipped with interface mechanism, interface mechanism includes explosion-proof glass lens, be equipped with the inner protective shroud between explosion-proof glass lens and the main part, switching power supply module includes switching power supply, main power source and stand-by power supply, and the main power source includes alternating current power supply, stand-by power supply includes 3 sections non-maintaining lithium cell altogether.
In order to facilitate the user to view the device status and the device operation in real time, preferably, the communication module includes a communication chip, a first fuse, a second fuse, a first capacitor, a first transient suppression diode, and a second transient suppression diode, a vcc terminal of the communication chip is connected to the first capacitor and the first resistor, a B terminal is connected to the second resistor and the first fuse, the other end of the first fuse is connected with the RS484SB end of the singlechip, the A end is connected with the second fuse and the first resistor, the other end of the second fuse is connected with the RS48SA end of the singlechip, one end of the first transient suppression diode is connected with the RS484SB end of the singlechip, one end of the second transient suppression diode is connected with the RS484SA end of the short set, the other ends of the first transient suppression diode 20 and the second transient suppression diode are respectively grounded, and the other end of the second resistor is grounded.
In order to provide real-time monitoring, concentration tracking and audible and visual alarm functions for the combustible gas and also externally connect equipment such as an exhaust fan and the like for emergency treatment after alarm, preferably, the single chip microcomputer comprises a PIC16F1933 enhanced single chip microcomputer core processing unit.
Preferably, the sensor comprises a sensing chip, a first four-way operational amplifier, a second four-way operational amplifier and a third four-way operational amplifier, the sensing chip is respectively connected with the input ends of the second four-way operational amplifier, the third four-way operational amplifier and the fourth four-way operational amplifier, the output ends of the second four-way operational amplifier and the third four-way operational amplifier are connected with the input end of the first four-way operational amplifier, the output end of the first four-way operational amplifier is connected with the SENADC end of the single chip microcomputer, and the output end of the fourth four-way operational amplifier is connected with the OP ADC end of the single chip microcomputer.
For real-time tracking, discovery and treatment of combustible gas, the sensor of the utility model comprises a NAP-50A type high-sensitivity catalytic combustion sensor.
In order to expand the capacity, expand the resource abundance, improve the anti-interference ability, facilitate the user to track and search the information such as fault, detection record, etc., preferably, the storage module includes a 32MBDDR memory and a FLASH-NAND memory.
Preferably, the microprocessor comprises a microprocessor chip, a first iron core coil, a first voltage stabilizing diode and a first diode, wherein the SW end of the microprocessor chip is connected with the first iron core coil and the second iron core coil IN series, and the other end of the second iron core coil, the position between the first iron core coil and the second iron core coil and the IN end of the microprocessor chip are respectively connected with two capacitors IN parallel.
In order to provide power for the thread main controller and the matched detector, and have the functions of battery charging and discharging maintenance and automatic main and standby electricity conversion, improve the working efficiency and reduce the loss, preferably, the switching power supply module comprises a circuit chip, a first electrolytic capacitor, a second electrolytic capacitor, a voltage stabilizing diode, a third iron core coil and a second diode, the DRC end of the circuit chip is connected with three resistors in parallel, the VCC end of the circuit chip is connected with a third fuse, the other end of the third fuse is connected with a first diode, a first electrolytic capacitor, a second electrolytic capacitor and a voltage stabilizing diode are connected in parallel at the VCC end of the circuit chip, the SWE end of the circuit chip is connected with the third core coil and the second diode, the other end of the second diode is grounded, the other end of the third iron core coil is connected with a VCC SV end of the single chip microcomputer, and the third iron core coil and the VCC SV end of the single chip microcomputer are connected with two electrolytic capacitors in parallel.
In order to automatically adjust the output voltage, so that the motor works in an optimal efficiency working area, and achieve the purpose of energy saving, preferably, the control module includes a control circuit board, the control circuit board is respectively connected to the power collecting ends of a first transistor, a second transistor, a third transistor, and a fourth transistor, the emitting ends of the first transistor, the second transistor, and the fourth transistor are connected to the VCC SV end of the single-chip microcomputer, the base end of the first transistor is connected to the SEG COM4 end of the single-chip microcomputer, the base end of the second transistor is connected to the SEG COM1 end of the single-chip microcomputer, the base end of the third transistor is connected to the SEG COM2 end of the single-chip microcomputer, and the base end of the fourth transistor is connected to the SEG COM3 end of the single-chip microcomputer.
In order to increase the length of the explosion-proof joint surface and reduce the temperature of high-temperature products generated by explosion of combustible mixtures in the shell to a safe range through the outward ejection of a labyrinth channel, preferably, the joints of the sensor outer sleeve and the main body and the joints of the interface structure and the main body are uniform explosion-proof thread joint surfaces, the meshing of the explosion-proof thread joint surfaces is more than 5 buckles, and the meshing length is more than 8 mm.
In order to improve the sealing performance, preferably, the inner wall of the sensor outer sleeve is provided with a stop ring in interference fit, the fit length is larger than or equal to 7mm, the lower end of the sensor is provided with a filter element, the filter element and the inner diameter of the sensor outer sleeve are in interference fit and fixed through adhesion, and the adhesion length is larger than or equal to 6 mm.
Has the advantages that:
based on 485 communication bus design, a PIC16F1933 enhanced single chip microcomputer core processing unit and an NAP-50A type high-sensitivity catalytic combustion type sensor are adopted, the sensor is designed aiming at the combustible gas leakage environment of an industrial field, the sensor has the functions of real-time monitoring, concentration tracking and sound-light alarm on the combustible gas, and can also be externally connected with equipment such as an exhaust fan and the like to perform emergency treatment after alarm, so that the combustible gas can be tracked, found and processed in real time.
The interface is clear, the operation is simple and convenient, the working state of the system can be more clearly displayed, and the user can conveniently check the equipment state and the equipment operation in real time.
The standard 485 bus is adopted to communicate with a matched detector, and the device has the characteristics of stability, reliability, interference resistance and the like.
Integrate the processing with the circuit function for the detector is whole small and exquisite, is convenient for install in narrow region, realizes the monitoring of full aspect to gas pipeline.
More than 999 information records can be stored, and the user can conveniently track and search the information such as faults, detection records and the like.
Can carry out low limit, high limit alarm value setting to supporting detector alone, have two sets of passive contact outputs, control interface can carry out pulse output or normal close, normally open output setting to it, the valve control on the adaptation market of being convenient for.
Drawings
FIG. 1: is the general assembly drawing of the utility model.
FIG. 2: do the circuit structure schematic diagram of the utility model.
FIG. 3: do the utility model discloses a schematic diagram of communication module circuit.
FIG. 4: do the utility model discloses a schematic diagram of singlechip circuit.
FIG. 5: is the schematic diagram of the sensor circuit of the present invention.
FIG. 6: is a schematic diagram of the microprocessor circuit of the present invention.
FIG. 7: do the utility model discloses a switching power supply module circuit's schematic diagram.
FIG. 8: do the utility model discloses a schematic diagram of control module circuit.
In the figure: 1. a body; 2, a main body; 3. a main board; 4. a sensor housing; 5. a sensor; 6. stopping withdrawal and returning; 7. a filter element; 8. A first O-shaped circle; 9. a nameplate; 10. a second O-shaped circle; 11. an explosion-proof glass lens; 12. a lens gasket; 13. an inner retainer; 14. a panel; 15. an explosion-proof thread joint surface; 16. a communication chip; 17. a first fuse; 18. a second fuse; 19. a first capacitor; 20. a first transient suppression diode; 21. a second transient suppression diode; 22. a first resistor; 23. a second resistor; 24. a single chip microcomputer; 25. a sensing chip; 26. a first four-way operational amplifier; 27. a second four-way operational amplifier; 28. a third four-way operational amplifier; 29. a fourth four-way operational amplifier; 30. a microprocessor chip; 31. A first core coil; 32. a second core coil; 33. a circuit chip; 34. a third fuse; 35. a first diode; 36. a first electrolytic capacitor; 37. a second electrolytic capacitor; 38. a voltage regulator diode; 39. a third ferromagnetic core wire; 40. a second diode; 41. a control circuit board; 42. a first transistor; 43. a second transistor; 44. a second transistor; 45. and a fourth transistor.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 7, the combustible gas detector of this embodiment includes a main board 3 disposed in a main body 1 and a sensor 5 disposed at a lower end of the main board 3, a sensor jacket 4 is disposed outside the sensor 5, the main board 3 includes a single chip microcomputer 24, a switching power supply module, a microprocessor module, a storage module, a communication module and a control module, output ends of the switching power supply module, the microprocessor module and the control module are respectively connected with an input end of the single chip microcomputer, interface ends of the storage module and the communication module are connected with an interface end of the single chip microcomputer 24, an interface mechanism is disposed at a front end of the main body 1, the interface mechanism includes an explosion-proof glass lens 11, an inner guard ring 13 is disposed between the explosion-proof glass lens 11 and the main body 1, and the switching power supply module includes a switching power supply, a main.
The communication module comprises a communication chip 16, a first fuse 17, a second fuse 18, a first capacitor 19, a first transient suppression diode 20 and a second transient suppression diode 21, wherein the vcc end of the communication chip 16 is connected with the first capacitor 19 and a first resistor 22, the B end is connected with a second resistor 23 and the first fuse 17, the other end of the first fuse 17 is connected with the RS484SB end of the singlechip, the A end is connected with the second fuse 18 and the first resistor 22, the other end of the second fuse 18 is connected with the RS48SA end of the singlechip, one end of the first transient suppression diode 20 is connected with the RS484SB end of the singlechip, the second transient suppression diode 21 is connected at one end to the RS484SA end of the short burst, the other ends of the first transient suppression diode 20 and the second transient suppression diode 21 are grounded, respectively, and the other end of the second resistor 23 is grounded.
The single chip microcomputer 24 comprises a PIC16F1933 enhanced single chip microcomputer core processing unit.
The sensor 5 comprises a sensing chip 25, a first four-way operational amplifier 26, a second four-way operational amplifier 27, a third four-way operational amplifier 28 and a fourth four-way operational amplifier 29, the sensing chip 25 is respectively connected with the input ends of a second four-way operational amplifier 27, a third four-way operational amplifier 28 and a fourth four-way operational amplifier 29, the output terminals of the second four-way operational amplifier 27 and the third four-way operational amplifier 29 are connected to the input terminal of the first four-way operational amplifier 26, the output end of the first four-way operational amplifier 26 is connected with the SEN ADC end of the single chip microcomputer 24, the output end of the fourth four-way operational amplifier 29 is connected with the OP ADC end of the single chip microcomputer 24, the input end of the third four-way operational amplifier 28 is connected with a capacitor, and the input end of the third four-way operational amplifier 29 is connected with two capacitors.
The storage module comprises a 32MBDDR memory and a FLASH-NAND memory.
The microprocessor comprises a microprocessor chip 30, a first iron core coil 31 and a second iron core coil 32, the SW end of the microprocessor chip 30 is connected with the first iron core coil 31 and the second iron core coil 32 IN series, and the other end of the second iron core coil 32, the position between the first iron core coil 31 and the second iron core coil 32 and the IN end of the microprocessor chip 30 are respectively connected with two capacitors IN parallel.
The utility model discloses a microprocessor's model is N329O5U1 DN.
The switching power supply module comprises a circuit chip 33, a first electrolytic capacitor 36, a second electrolytic capacitor 37, a voltage stabilizing diode 38, a third iron core coil 39 and a second diode 40, three resistors are connected in parallel at the DRC end of the circuit chip 33, a third fuse 34 is connected at the VCC end of the circuit chip 33, a first diode 35 is connected at the other end of the third fuse 34, the first electrolytic capacitor 36, the second electrolytic capacitor 37 and the voltage stabilizing diode 38 are connected in parallel at the VCC end of the circuit chip 33, the SWE end of the circuit chip 33 is connected with the third iron core coil 39 and the second diode 40, the other end of the second diode 40 is grounded, the other end of the third iron core coil 39 is connected with the VCC SV end of the single chip 24, two electrolytic capacitors are connected in parallel at the VCC SV ends of the third iron core coil 39 and the single chip 24, and the switching power supply module further comprises a switching power supply, The main power supply comprises an alternating current power supply, and the standby power supply comprises 3 sections of maintenance-free lithium batteries.
The control module comprises a control circuit board 41, the control circuit board 41 is respectively connected with the current collecting ends of a first transistor 42, a second transistor 43, a third transistor 44 and a fourth transistor 45, the emitting ends of the first transistor 42, the second transistor 43, the second transistor 44 and the fourth transistor 45 are connected with the VCC SV end of the single chip microcomputer, the base end of the first transistor 42 is connected with the SEG COM4 end of the single chip microcomputer 24, the base end of the second transistor 43 is connected with the SEG COM1 end of the single chip microcomputer 24, the base end of the third transistor 44 is connected with the SEG COM2 end of the single chip microcomputer 24, and the base end of the fourth transistor 45 is connected with the SEG COM3 end of the single chip microcomputer 24.
The joint of the sensor outer sleeve 4 and the main body 2 and the joint of the interface structure and the main body 2 are explosion-proof thread joint surfaces 15, the engagement of the explosion-proof thread joint surfaces is more than 5 buttons, and the meshing length is more than 8 mm.
The sensor is characterized in that a stop ring 6 in interference fit is arranged on the inner wall of the sensor jacket 4, the length of the interference fit is larger than or equal to 7mm, a filter element 7 is arranged at the lower end of the sensor 5, the filter element 7 and the inner diameter of the sensor jacket 4 are in interference fit and fixed through gluing, and the gluing length is larger than or equal to 6 mm.
By adopting the technical scheme, in practical application, the detector is electrified, a system of the detector is initialized, the combustible gas concentration calculation and alarm monitoring system monitors the surrounding environment, if the combustible gas concentration exceeds a set value, the system transmits a signal to the acousto-optic alarm, fault monitoring is carried out, the nixie tube displays the result, and if the combustible gas concentration does not exceed the set value, the acousto-optic alarm and the alarm are filtered and output. An HTEXS1 type combustible bus gas detector is designed based on a 485 communication bus, adopts a PIC16F1933 enhanced single chip microcomputer core processing unit and an NAP-50A type high-sensitivity catalytic combustion type sensor, is designed aiming at the combustible gas leakage environment of an industrial field, has the functions of real-time monitoring, concentration tracking and sound-light alarming on combustible gas, can also be externally connected with equipment such as an exhaust fan and the like for emergency treatment after alarming, and achieves real-time tracking, discovery and immediate treatment on the combustible gas.
A220V/24 VDC4A switching power supply module is developed autonomously, a main power supply adopts a 220V/50Hz alternating current power supply, a standby power supply adopts 3-section 12V3A maintenance-free lithium batteries, power can be provided for a main controller and a matched detector, and the automatic switching power supply has the functions of battery charging and discharging maintenance and main and standby power automatic switching.
Adopt the design of 7 cun resistance screen full touch screens, the interface is clear, easy operation is convenient, system operating condition can be more clear show out, convenience of customers looks over equipment state and equipment operation in real time, adopt standard 485 bus and supporting detector to carry out the communication, have characteristics such as reliable and stable, anti-interference, adopt hi-lite, jumbo size charactron to carry out concentration display, it is convenient to survey, show reliable and stable, show clearly bright, can satisfy indoor outer display requirement under (-40 ~ 70 ℃) the temperature.
The high-performance and high-interference-resistance N32905U1DN microprocessor with an ARM926EJ-S inner core is adopted, the expansion resources are rich, a 32MBDDR memory is integrated in the microprocessor, a large-capacity FLASH-NAND memory is additionally expanded on a board, more than 999 information records can be stored, and a user can conveniently track and search information such as faults, detection records and the like. Can carry out low limit, high limit alarm value setting to supporting detector alone, have two sets of passive contact outputs, control interface can carry out pulse output or normal close, normally open output setting to it, the valve control on the adaptation market of being convenient for.
Integrate the processing with the circuit function for the detector is whole small and exquisite, is convenient for install in narrow region, realizes the monitoring of full aspect to gas pipeline.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A combustible gas detector, characterized by: the intelligent explosion-proof glass lamp comprises a main board and a sensor, wherein the main board is arranged in the main body, the sensor is arranged at the lower end of the main board, a sensor jacket is arranged outside the sensor, the main board comprises a single chip microcomputer, a switching power supply module, a micro processing module, a storage module, a communication module and a control module, the output ends of the switching power supply module, the microprocessor module and the control module are respectively connected with the input end of the single chip microcomputer, the interface ends of the storage module and the RS24S communication module are connected with the interface end of the single chip microcomputer, an interface mechanism is arranged at the front end of the main body and comprises an explosion-proof glass lens, an inner guard ring is arranged between the explosion-proof glass lens and the main.
2. A combustible gas sensor according to claim 1 wherein: the communication module comprises a communication chip, a first fuse, a second fuse, a first capacitor, a first transient suppression diode and a second transient suppression diode, wherein the vcc end of the communication chip is connected with the first capacitor and the first resistor, the B end of the communication chip is connected with the second resistor and the first fuse, the other end of the first fuse is connected with the RS484SB end of the single chip microcomputer, the A end of the first fuse is connected with the second fuse and the first resistor, the other end of the second fuse is connected with the RS48SA end of the single chip microcomputer, one end of the first transient suppression diode is connected with the RS484SB end of the single chip microcomputer, one end of the second transient suppression diode is connected with the RS484SA end of the single chip microcomputer, the other ends of the first transient suppression diode and the second transient suppression diode are respectively grounded, and the other end of the second resistor is grounded.
3. A combustible gas sensor according to claim 1 wherein: the single chip microcomputer comprises a PIC16F1933 enhanced single chip microcomputer core processing unit.
4. A combustible gas sensor according to claim 1 wherein: the sensor comprises a sensing chip, a first four-way operational amplifier, a second four-way operational amplifier, a third four-way operational amplifier and a fourth four-way operational amplifier, wherein the sensing chip is respectively connected with the input ends of the second four-way operational amplifier, the third four-way operational amplifier and the fourth four-way operational amplifier, the output ends of the second four-way operational amplifier and the third four-way operational amplifier are connected with the input end of the first four-way operational amplifier, the output end of the first four-way operational amplifier is connected with the SEN ADC end of the single chip microcomputer, and the output end of the fourth four-way operational amplifier is connected with the OP ADC end of the single chip microcomputer.
5. A combustible gas sensor according to claim 1 wherein: the storage module comprises a 32MBDDR memory and a FLASH-NAND memory.
6. A combustible gas sensor according to claim 1 wherein: the microprocessor comprises a micro-processing chip, a first iron core coil and a second iron core coil, wherein the SW end of the micro-processing chip is connected with the first iron core coil and the second iron core coil IN series, and the other end of the second iron core coil, the position between the first iron core coil and the second iron core coil and the IN end of the micro-processing chip are respectively connected with two capacitors IN parallel.
7. A combustible gas sensor according to claim 1 wherein: the switching power supply module comprises a circuit chip, a first electrolytic capacitor, a second electrolytic capacitor, a voltage stabilizing diode, a third iron core coil and a second diode, three resistors are connected in parallel at the DRC end of the circuit chip, a third fuse is connected at the VCC end of the circuit chip, a first diode is connected at the other end of the third fuse, the first electrolytic capacitor, the second electrolytic capacitor and the voltage stabilizing diode are connected at the VCC end of the circuit chip in parallel, the SWE end of the circuit chip is connected with the third iron core coil and the second diode, the other end of the second diode is grounded, the other end of the third iron core coil is connected with the VCC SV end of the single chip, and the VCC SV ends of the third iron core coil and the single chip are connected with two electrolytic capacitors in parallel.
8. A combustible gas sensor according to claim 1 wherein: the control module comprises a control circuit board, the control circuit board is respectively connected with the power collecting ends of a first transistor, a second transistor and a fourth transistor, the transmitting ends of the first transistor, the second transistor, the third transistor and the fourth transistor are connected with the VCC SV end of the single chip microcomputer, the base end of the first transistor is connected with the SEGCOM4 end of the single chip microcomputer, the base end of the second transistor is connected with the SEG COM1 end of the single chip microcomputer, the base end of the third transistor is connected with the SEG COM2 end of the single chip microcomputer, and the base end of the fourth transistor is connected with the SEG COM3 end of the single chip microcomputer.
9. A combustible gas sensor according to claim 1 wherein: the joint of the sensor outer sleeve and the main body and the joint of the interface structure and the main body are uniform explosion-proof thread joint surfaces, the meshing of the explosion-proof thread joint surfaces is more than 5 buttons, and the meshing length is more than 8 mm.
10. A combustible gas sensor according to claim 1 wherein: the sensor is characterized in that a stop ring in interference fit is arranged on the inner wall of the sensor outer sleeve, the fit length is larger than or equal to 7mm, a filter element is arranged at the lower end of the sensor, the filter element and the inner diameter of the sensor outer sleeve are in interference fit and fixed through adhesion, and the adhesion length is larger than or equal to 6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920097036.4U CN209894769U (en) | 2019-01-21 | 2019-01-21 | Combustible gas detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920097036.4U CN209894769U (en) | 2019-01-21 | 2019-01-21 | Combustible gas detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209894769U true CN209894769U (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920097036.4U Active CN209894769U (en) | 2019-01-21 | 2019-01-21 | Combustible gas detector |
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| Country | Link |
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| CN (1) | CN209894769U (en) |
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2019
- 2019-01-21 CN CN201920097036.4U patent/CN209894769U/en active Active
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