CN203944632U - Bench for chemistry experiment pernicious gas automatic discharge device - Google Patents
Bench for chemistry experiment pernicious gas automatic discharge device Download PDFInfo
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- CN203944632U CN203944632U CN201420386344.6U CN201420386344U CN203944632U CN 203944632 U CN203944632 U CN 203944632U CN 201420386344 U CN201420386344 U CN 201420386344U CN 203944632 U CN203944632 U CN 203944632U
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Abstract
The utility model discloses a kind of bench for chemistry experiment pernicious gas automatic discharge device, comprise blower cover, exhaust duct, air exhauster and controller, blower cover is the cone-shaped structure of interior sky, its big opening end is arranged on experimental bench top downwards, one end of exhaust duct is connected with the upper end of blower cover, the other end of exhaust duct is arranged on outside laboratory and air exhauster is installed, in described blower cover, sensor is installed, exhaust duct one side on blower cover top is provided with controller, the input electrical connection sensor of controller, the output electrical connection air exhauster of controller, on controller, be electrically connected with attaching plug.The utility model is reasonable in design, simple in structure, it is strong to do interference, reliable in action, practical, easy and simple to handle, automatically detect, in the time detecting that pernicious gas reaches finite concentration, pernicious gas can be discharged in time automatically outside laboratory, effective guarantee teachers and students' health, be particularly useful for laboratory and use.
Description
Technical field
The utility model relates to harmful gas detection technology field, is specifically related to a kind of bench for chemistry experiment pernicious gas automatic discharge device.
Background technology
In chemical laboratory, often contain the harmful gases such as CO, NH3, NO, NO2, when low concentration, can produce harm to respiratory system, when high concentration, can cause people's stupor until dead, it is outward very necessary therefore chemical laboratory being carried out to the also timely discharge chamber of toxic gas detection.Have in the market the device of some integrated gas sensors, its volume is relatively large, complicated operation, detection is wasted time and energy, can only for detection of and pernicious gas cannot be discharged in time, cannot ensure teachers and students' health, be not suitable in laboratory and use.
Summary of the invention
The purpose of this utility model is exactly the defect existing for prior art, and a kind of bench for chemistry experiment pernicious gas automatic discharge device is provided.
Its technical scheme is: bench for chemistry experiment pernicious gas automatic discharge device, comprise blower cover, exhaust duct, air exhauster and controller, blower cover is the cone-shaped structure of interior sky, its big opening end is arranged on experimental bench top downwards, one end of exhaust duct is connected with the upper end of blower cover, the other end of exhaust duct is arranged on outside laboratory and air exhauster is installed, in described blower cover, sensor is installed, exhaust duct one side on blower cover top is provided with controller, the input electrical connection sensor of controller, the output electrical connection air exhauster of controller, on controller, be electrically connected with attaching plug.
Wherein, described controller is by transformer, the first diode, the second diode, potentiometer, triode, relay, Zener diode and electric capacity composition, one end of described attaching plug is connected with an input of one end of relay normally open contact and transformer, the other end of attaching plug is connected with another input of one end of air exhauster and transformer, the other end of relay normally open contact is connected with the other end of air exhauster, the upper output of transformer is connected with the positive pole of the first diode, a signal end of the negative pole of the first diode and sensor, one end of relay, the negative pole of the second diode, the negative pole of Zener diode and the positive pole of electric capacity are connected, and the middle output of transformer is connected with a pre-hot junction of sensor, another pre-hot junction of the lower output of transformer and sensor, the lower quiet end of potentiometer, the emitter stage of triode, the positive pole of Zener diode and the negative pole of electric capacity are connected, the colelctor electrode of triode is connected with the positive pole of the other end of relay and the second diode, the base stage of triode is connected with the moved end of potentiometer, and the upper quiet end of potentiometer is connected with another signal end of sensor.Described sensor is harmful gas sensor, and its model is QM-N5.The power of described transformer is 2-5W, and input voltage is alternating current 220V, and the output voltage between its lower output and middle output is for exchanging 3-5V, and the output voltage between lower output and upper output is for exchanging 12-15V.The voltage stabilizing value of described Zener diode is 9-10V.The model of described triode is 8050.The resistance of described potentiometer is 10-51K.The model of described the first diode and the second diode is 1N4007.The capacity of described electric capacity is 100-470u, and it is withstand voltage is more than or equal to 25V.
The utility model compared with prior art, have the following advantages: reasonable in design, simple in structure, to do interference strong, reliable in action, practical, easy and simple to handle, automatically detect, in the time detecting that pernicious gas reaches finite concentration, pernicious gas can be discharged outside laboratory in time automatically, effective guarantee teachers and students' health, be particularly useful for laboratory use.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of embodiment of the utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Detailed description of the invention
With reference to Fig. 1-Fig. 2, a kind of bench for chemistry experiment pernicious gas automatic discharge device, comprise blower cover 1, exhaust duct 2, air exhauster 3 and controller 4, the cone-shaped structure that blower cover 1 is interior sky, its big opening end is arranged on experimental bench top downwards, one end of exhaust duct 2 is connected with the upper end of blower cover 1, the other end of exhaust duct 2 is arranged on outside laboratory and air exhauster 3 is installed, in described blower cover 1, sensor 5 is installed, exhaust duct 2 one sides on blower cover 1 top are provided with controller 4, the input electrical connection sensor 5 of controller 4, the output electrical connection air exhauster 3 of controller 4, on controller 4, be electrically connected with attaching plug 6.Controller 4 is by transformer B, the first diode D1, the second diode D2, potentiometer W, triode T, relay J, Zener diode DW and capacitor C composition, one end of attaching plug 6 is connected with one end of relay normally open contact J-1 and an input of transformer B, the other end of attaching plug 6 is connected with one end of air exhauster 3 and another input of transformer B, the other end of relay normally open contact J-1 is connected with the other end of air exhauster 3, the upper output of transformer B is connected with the positive pole of the first diode D1, one signal end of the negative pole of the first diode D2 and sensor 5, one end of relay J, the negative pole of the second diode D2, the negative pole of Zener diode DW and the positive pole of capacitor C are connected, the middle output of transformer B is connected with a pre-hot junction of sensor 5, another pre-hot junction of the lower output of transformer B and sensor 5, the lower quiet end of potentiometer W, the emitter stage of triode T, the positive pole of Zener diode DW and the negative pole of capacitor C are connected, the colelctor electrode of triode T is connected with the positive pole of the other end of relay J and the second diode D2, the base stage of triode T is connected with the moved end of potentiometer W, the upper quiet end of potentiometer W is connected with another signal end of sensor 5.Sensor 5 is harmful gas sensor, and its model is QM-N5.The power of transformer is 2-5W, and input voltage is alternating current 220V, and the output voltage between its lower output and middle output is for exchanging 3-5V, and the output voltage between lower output and upper output is for exchanging 12-15V.The voltage stabilizing value of Zener diode DW is 9-10V.The model of triode T is 8050.The resistance of potentiometer W is 10-51K.The model of the first diode D1 and the second diode D2 is 1N4007.The capacity of capacitor C is 100-470u, and it is withstand voltage is more than or equal to 25V.
Attaching plug 6 is inserted to power supply, now in this device, under the driving of sensor 5 output and middle output under transformer, need the preheating time of 2-5 minutes, then enter work monitored state.At ordinary times, sensor 5 does not contact pernicious gas, and the resistance value between its two signal end is very large, at this moment triode T cut-off, and relay J is not worked.When experimental bench does after chemical experiment, when the concentration of the pernicious gas in the monitored district under blower cover 1 reaches certain value, resistance between sensor two signal ends will diminish, make triode T saturation conduction, relay J work, relay normally open contact J-1 closure, air exhauster 3 obtains electric work pernicious gas is extracted out outside laboratory.Adjust the sensitivity of this device of potentiometer W capable of regulating.
The utility model is reasonable in design, simple in structure, it is strong to do interference, reliable in action, practical, easy and simple to handle, automatically detect, in the time detecting that pernicious gas reaches finite concentration, pernicious gas can be discharged in time automatically outside laboratory, effective guarantee teachers and students' health, be particularly useful for laboratory and use.
Claims (9)
1. bench for chemistry experiment pernicious gas automatic discharge device, comprise blower cover, exhaust duct, air exhauster and controller, it is characterized in that: the cone-shaped structure that blower cover is interior sky, its big opening end is arranged on experimental bench top downwards, one end of exhaust duct is connected with the upper end of blower cover, the other end of exhaust duct is arranged on outside laboratory and air exhauster is installed, in described blower cover, sensor is installed, exhaust duct one side on blower cover top is provided with controller, the input electrical connection sensor of controller, the output electrical connection air exhauster of controller, on controller, be electrically connected with attaching plug.
2. bench for chemistry experiment pernicious gas automatic discharge device according to claim 1, it is characterized in that: described controller is by transformer, the first diode, the second diode, potentiometer, triode, relay, Zener diode and electric capacity composition, one end of described attaching plug is connected with an input of one end of relay normally open contact and transformer, the other end of attaching plug is connected with another input of one end of air exhauster and transformer, the other end of relay normally open contact is connected with the other end of air exhauster, the upper output of transformer is connected with the positive pole of the first diode, one signal end of the negative pole of the first diode and sensor, one end of relay, the negative pole of the second diode, the negative pole of Zener diode and the positive pole of electric capacity are connected, the middle output of transformer is connected with a pre-hot junction of sensor, another pre-hot junction of the lower output of transformer and sensor, the lower quiet end of potentiometer, the emitter stage of triode, the positive pole of Zener diode and the negative pole of electric capacity are connected, the colelctor electrode of triode is connected with the positive pole of the other end of relay and the second diode, the base stage of triode is connected with the moved end of potentiometer, the upper quiet end of potentiometer is connected with another signal end of sensor.
3. bench for chemistry experiment pernicious gas automatic discharge device according to claim 1 and 2, is characterized in that: described sensor is harmful gas sensor, its model is QM-N5.
4. bench for chemistry experiment pernicious gas automatic discharge device according to claim 2, it is characterized in that: the power of described transformer is 2-5W, input voltage is alternating current 220V, output voltage between its lower output and middle output is for exchanging 3-5V, and the output voltage between lower output and upper output is for exchanging 12-15V.
5. bench for chemistry experiment pernicious gas automatic discharge device according to claim 2, is characterized in that: the voltage stabilizing value of described Zener diode is 9-10V.
6. bench for chemistry experiment pernicious gas automatic discharge device according to claim 2, is characterized in that: the model of described triode is 8050.
7. bench for chemistry experiment pernicious gas automatic discharge device according to claim 2, is characterized in that: the resistance of described potentiometer is 10-51K.
8. bench for chemistry experiment pernicious gas automatic discharge device according to claim 2, is characterized in that: the model of described the first diode and the second diode is 1N4007.
9. bench for chemistry experiment pernicious gas automatic discharge device according to claim 2, is characterized in that: the capacity of described electric capacity is 100-470u, it is withstand voltage is more than or equal to 25V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420386344.6U CN203944632U (en) | 2014-07-14 | 2014-07-14 | Bench for chemistry experiment pernicious gas automatic discharge device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420386344.6U CN203944632U (en) | 2014-07-14 | 2014-07-14 | Bench for chemistry experiment pernicious gas automatic discharge device |
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| Publication Number | Publication Date |
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| CN203944632U true CN203944632U (en) | 2014-11-19 |
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| CN201420386344.6U Expired - Fee Related CN203944632U (en) | 2014-07-14 | 2014-07-14 | Bench for chemistry experiment pernicious gas automatic discharge device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107866433A (en) * | 2016-09-23 | 2018-04-03 | 苏州润桐专利运营有限公司 | A kind of portable alarming soot processing device |
| CN109848166A (en) * | 2018-12-18 | 2019-06-07 | 中华人民共和国日照海关 | A kind of laboratory automation air exhausting device and its application method |
| CN114023140A (en) * | 2021-11-29 | 2022-02-08 | 赵益峰 | Chemical experiment training system |
| RU2793668C1 (en) * | 2022-05-27 | 2023-04-04 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) | Aspiration dust collector |
-
2014
- 2014-07-14 CN CN201420386344.6U patent/CN203944632U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107866433A (en) * | 2016-09-23 | 2018-04-03 | 苏州润桐专利运营有限公司 | A kind of portable alarming soot processing device |
| CN109848166A (en) * | 2018-12-18 | 2019-06-07 | 中华人民共和国日照海关 | A kind of laboratory automation air exhausting device and its application method |
| CN114023140A (en) * | 2021-11-29 | 2022-02-08 | 赵益峰 | Chemical experiment training system |
| CN114023140B (en) * | 2021-11-29 | 2024-01-26 | 安徽蓝西实验设备有限公司 | Chemistry experiment training system |
| RU2793668C1 (en) * | 2022-05-27 | 2023-04-04 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) | Aspiration dust collector |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141119 Termination date: 20150714 |
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| EXPY | Termination of patent right or utility model |