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Automatic gas emission control circuit and device

An automatic discharge and control circuit technology, applied in electrical components, electronic switches, pulse technology, etc., can solve the problems of poor safety and reliability, low sensitivity, low detection accuracy, etc., and achieve accurate and reliable detection, high sensitivity, and high detection accuracy. Effect

Pending Publication Date: 2017-02-01
湖南金泰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical defects of low detection accuracy, poor safety and reliability, and low sensitivity of the float level controller in the prior art, the present invention provides a high detection accuracy, strong safety and reliability, and high sensitivity The gas gas automatic discharge control circuit and the gas automatic discharge control device

Method used

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  • Automatic gas emission control circuit and device

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Effect test

Embodiment 1

[0018] see figure 1 , the present embodiment provides a gas automatic discharge control circuit, including: a gas sensor QM, an adjustable resistor RP, a first triode VT1, a second triode VT2, a third triode VT3, and a relay KA The resistance value of the gas sensor is positively correlated with the detected gas concentration, and the gas sensor QM is connected in parallel with the adjustable resistor RP; the first transistor VT1 and the second transistor VT2 are NPN type transistor, the third transistor VT3 is a PNP type transistor, the base of the first transistor VT1 is connected in series with the gas sensor QM, and the base of the second transistor VT2 is connected in series with the first The emitter of the transistor VT1, the base of the third transistor VT3 are connected in series with the collector of the second transistor VT2, and the relay KA is connected in series with the emitter of the third transistor VT3. A rectification circuit is also included, and the recti...

Embodiment 2

[0027] see figure 1 This embodiment provides an automatic gas discharge control device, including the automatic gas discharge control circuit described in Embodiment 1, and at least one exhaust fan connected in series with the relay KA. The gas sensor QM is arranged in a protection space, and the protection space is used to prevent oil and dust from passing through. In addition, the gas sensor QM is set in a protective space that prevents oil and dust from passing through, but allows dangerous gases to pass through, thereby ensuring that the gas sensor QM can be used for a long time and still maintain high precision.

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Abstract

An automatic gas emission control circuit and device are disclosed. The automatic gas emission control circuit comprises a gas-sensitive element, an adjustable resistor, a first triode, a second triode, a third triode and a relay device; resistance value of the gas-sensitive element is in a positive relation with concentration of gas being detected, the gas-sensitive element is connected with the adjustable resistor in parallel, the first triode and the second triode VT2 are NPN type triodes, the third triode is a PNP type triode, a base electrode of the first triode is connected with the gas-sensitive element in series, a base electrode of the second triode is connected with an emitter electrode of the first triode in series, a base electrode of the third triode is connected with a collector electrode of the second triode in series, and the relay is connected with an emitter electrode of the third triode in series. The automatic gas emission control circuit and device disclosed in the invention is high in safety, reliability, sensitivity and detection precision.

Description

technical field [0001] The invention relates to the field of security technology, in particular to a gas automatic discharge control circuit and device. Background technique [0002] In the process of chemical analysis in chemical production and chemical analysis laboratories, toxic or flammable and explosive chemical gases are often produced, which will cause serious harm to personal safety if they are not discharged in time. An existing treatment method for the above-mentioned dangerous gas is: use a float level controller to detect the liquid level, and when the liquid level reaches a preset threshold, the float level controller outputs a control signal to release the gas discharge. However, the float level controller has the following defects: 1. The float level controller is a mechanical switch, which cannot maintain a high-precision detection level after a long period of use. And when the mechanical switch is stuck or corroded, it will affect the detection results, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/94
CPCH03K17/94
Inventor 李田初
Owner 湖南金泰环保科技有限公司