A volatile organic compound detection device

Abstract

The utility model relates to gas detection technical field, concretely is a kind of volatile organic compound detection device, including device ontology, device ontology inside is provided with suction pump, suction pipe, gas cavity, detection cavity, sensor detection module and main control module;The gas cavity is provided with gas cavity entrance, exhaust outlet one and gas cavity export, and active carbon granule is arranged in the gas cavity, and heating assembly is installed in the outer wall of gas cavity;The detection cavity is provided with detection cavity entrance, exhaust outlet two;The air inlet is connected with suction pipe one end by suction pump, and the gas cavity entrance of the gas cavity is connected with the other end of suction pipe;The gas cavity export of gas cavity is connected with the detection cavity entrance of detection cavity and is connected in conduction.The active carbon granule arranged in the gas cavity is used to separate VOCs gas in mixed gas and ordinary air, avoid the concentration detection distortion caused by ordinary air dilution, and improve the accuracy of detection.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology, specifically to a volatile organic compound detection device. Background Technology

[0002] Volatile organic compounds (VOCs), as key components in industrial production processes, are significant pollutants in the atmospheric environment and pose potential hazards to human health. Accurate and rapid detection of VOCs is crucial for environmental monitoring, industrial safety control, and occupational health protection.

[0003] Currently, the mainstream sampling method for VOCs detection devices on the market is pump-suction. This device actively draws gas from the environment to be detected into the sensor module inside the device using negative pressure generated by a built-in pump for gas concentration detection. However, this pump-suction sampling method inevitably draws in a large amount of ordinary air during the active extraction of the target gas. This ordinary air mixes with the target VOCs gas in the device's sampling pipe or detection chamber. Since the final measurement is the overall response value of the mixed gas, the dilution effect of ordinary air can cause concentration distortion of the target VOCs gas, thus affecting the rapid response of the sensor module inside the VOCs detection device to VOCs gas. Furthermore, the target VOCs gas is also affected by air humidity, further impacting the accuracy and reliability of the detection results. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a volatile organic compound (VOC) detection device, comprising a device body, an air inlet on the outside of the device body, and an air pump, an air suction pipe, a gas chamber, a detection chamber, a sensor detection module, and a main control module inside the device body.

[0005] The gas chamber is provided with a gas chamber inlet, an exhaust outlet, and a gas chamber outlet. Activated carbon particles are placed inside the gas chamber, and a heating component is installed on the outer wall of the gas chamber. The detection chamber is provided with a detection chamber inlet and an exhaust outlet. The air inlet is connected to one end of an air suction pipe via an air pump, and the other end of the air suction pipe is connected to the gas chamber inlet of the gas chamber. The gas chamber outlet of the gas chamber is connected and conductive to the detection chamber inlet of the detection chamber. The main control module is electrically connected to the air pump, the sensor detection module, and the heating component.

[0006] The sensor detection module includes an infrared laser, a photon sensor, and a signal processing circuit. The infrared laser and the signal processing circuit are electrically connected to the main control module, and the photon sensor is electrically connected to the signal processing circuit.

[0007] An electric switching valve is installed between the gas chamber outlet and the detection chamber inlet, and the electric switching valve is electrically connected to the main control module.

[0008] Valves are installed at each inlet and outlet of the gas chamber and the detection chamber, and the valves are electrically connected to the main control module.

[0009] To prevent the air inlet from drawing in other impurity particles while drawing in air, a pre-filter is installed between the air inlet and the air pump.

[0010] In a specific embodiment, the infrared laser and the photon sensor are disposed inside the detection cavity.

[0011] In addition, a nitrogen inlet is provided on the outside of the device body.

[0012] The detection chamber is equipped with a fluid inlet connected to a nitrogen inlet, through which residual VOCs gas in the detection chamber is removed by external nitrogen gas.

[0013] To facilitate users' intuitive viewing of the detection results, a display screen electrically connected to the main control module is also provided on the outer surface of the device body.

[0014] The display screen is an LCD backlit display.

[0015] Beneficial Effects: This utility model is a volatile organic compound (VOC) detection device. By installing a pre-filter between the air inlet and the suction pipe, it solves the problem of impurity particles being drawn into the air inlet and affecting detection, ensuring the purity of the gas entering the device. Activated carbon particles placed inside the gas chamber separate VOCs from ordinary air in the mixed gas, avoiding concentration distortion caused by dilution with ordinary air and improving detection accuracy. A heating component on the outer wall of the gas chamber thermally desorbs the VOCs adsorbed by the activated carbon and transfers them to the detection chamber. Infrared light detection avoids the influence of temperature, humidity, and air pressure changes on VOCs, providing reliable detection results. Attached Figure Description

[0016] The advantages and solutions of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.

[0017] In the attached diagram:

[0018] Figure 1 This is a schematic diagram of a volatile organic compound detection device. Detailed Implementation

[0019] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0020] Example

[0021] See Figure 1 This embodiment provides a volatile organic compound (VOC) detection device, including a device body with an air inlet and an exhaust outlet on its exterior. The device body internally houses a vacuum pump, a suction pipe, a gas chamber, a detection chamber, a sensor detection module, and a main control module. The main control module is electrically connected to the vacuum pump and the sensor detection module. The gas chamber has a gas chamber inlet, an exhaust outlet (I), and a gas chamber outlet. The detection chamber has a detection chamber inlet and an exhaust outlet (II). Exhaust outlets I and II are connected to and communicate with an external exhaust outlet. The air inlet is connected to one end of the suction pipe via the vacuum pump, and the other end of the suction pipe is connected to the gas chamber inlet. In actual use, the vacuum pump creates negative pressure, and the air inlet generates suction to collect gas from the external environment, which is then transferred to the gas chamber for storage via the suction pipe. Furthermore, to prevent the air inlet from drawing in other impurity particles while drawing in gas, a pre-filter is installed between the air inlet and the vacuum pump.

[0022] To separate VOCs from ordinary air in the inhaled gas mixture, activated carbon particles are placed inside the gas chamber. When the gas mixture fills the gas chamber, VOCs are efficiently adsorbed as they pass through the surface of the activated carbon. After the activated carbon particles in the gas chamber have adsorbed VOCs for a period of time, the unadsorbed gas is discharged by opening the exhaust port of the gas chamber, thus separating and expelling the ordinary air from the gas mixture. At this point, the gas chamber only contains the VOCs adsorbed by the activated carbon.

[0023] The gas chamber is connected to the detection chamber, specifically, the gas outlet of the gas chamber is connected and conductively connected to the inlet of the detection chamber. An electrically operated valve is installed between the gas outlet and the inlet of the detection chamber. This electrically operated valve is electrically connected to the main control module and can open and close or close according to the control commands of the main control module. Simultaneously, valves are installed at each inlet and outlet of both the gas chamber and the detection chamber, and these valves are electrically connected to the main control module. The detection chamber is used to receive and process the VOCs gas transmitted from the gas storage chamber.

[0024] To enable the release and storage of VOCs adsorbed by activated carbon in the gas chamber to the detection chamber, a heating component, which can be a heating resistance wire, is installed on the outer wall of the gas chamber and is electrically connected to the main control module. The main control module controls the heating component to heat the gas chamber, causing thermal desorption of the activated carbon particles. Simultaneously, the main control module opens an electric valve, creating a negative pressure in the detection chamber relative to the gas chamber. This allows the thermally desorbed VOCs to be introduced into the detection chamber. The main control module then controls the sensor detection module to detect the target gas within the detection chamber.

[0025] To detect the target gas within the detection cavity, the sensor detection module includes an infrared laser, a photon sensor, and a signal processing circuit. The infrared laser and photon sensor are located inside the detection cavity. The infrared laser is electrically connected to the main control module, and the photon sensor is electrically connected to the signal processing circuit. The output of the signal processing circuit is connected to the input of the main control module. The emitted light from the infrared laser can be detected and received by the photon sensor. During detection, the infrared laser emits infrared light of a specific wavelength to irradiate the target gas within the detection cavity. The photon sensor receives the light signal reflected back by the target gas and converts it into an electrical signal. This electrical signal is transmitted to the main control module via the signal processing circuit. The main control module confirms the detection of the target gas based on the magnitude of the current in the electrical signal. Using infrared light for VOCs gas detection offers strong anti-interference capabilities. Changes in temperature, humidity, or air pressure do not affect the propagation and detection of infrared light, thus providing a reliable guarantee for the detection of volatile organic compounds.

[0026] The main control module includes a processor chip, a memory, and a power supply circuit. The processor chip is electrically connected to the memory and the power supply circuit respectively. The power supply circuit is used to provide working power to the electrical components of the entire device. The processor chip is used to transmit control commands to the heating component, the electric switching valve, and the sensor detection module, and to receive the detection data from the sensor detection module and save the data to the memory.

[0027] Meanwhile, to facilitate users' direct access to test results, a display screen electrically connected to the main control module is also installed on the outer surface of the device. This display screen shows the test data output by the main control module. The display screen uses an LCD backlit display, ensuring clear visibility even in low-light environments.

[0028] In addition, to ensure the accuracy and reliability of the volatile organic compound (VOC) gas detection device in a single test, a nitrogen inlet is provided on the outside of the device body, and a fluid inlet connected to the nitrogen inlet is provided in the detection chamber. If residual VOC gas remains in the detection chamber, causing abnormal VOC gas detection results, nitrogen can be connected to the nitrogen inlet to blow high-pressure nitrogen into the detection chamber, and the second exhaust outlet of the detection chamber can be opened to remove the residual gas and ensure the accuracy of subsequent tests.

Claims

1. A volatile organic compound (VOC) detection device, comprising a device body, wherein an air inlet is provided on the exterior of the device body, characterized in that, The device body is equipped with an air pump, an air suction pipe, a gas chamber, a detection chamber, a sensor detection module, and a main control module. The gas chamber is provided with a gas chamber inlet, an exhaust outlet 1, and a gas chamber outlet. Activated carbon particles are placed inside the gas chamber, and a heating component is installed on the outer wall of the gas chamber. The detection chamber is provided with a detection chamber inlet and an exhaust outlet 2. The air inlet is connected to one end of the suction pipe via a suction pump, and the other end of the suction pipe is connected to the gas chamber inlet of the gas chamber. The gas chamber outlet of the gas chamber is connected and connected to the detection chamber inlet of the detection chamber. The main control module is electrically connected to the air pump, the sensor detection module, and the heating component.

2. The volatile organic compound detection device according to claim 1, characterized in that, The sensor detection module includes an infrared laser, a photon sensor, and a signal processing circuit. The infrared laser and the signal processing circuit are electrically connected to the main control module, and the photon sensor is electrically connected to the signal processing circuit.

3. The volatile organic compound detection device according to claim 1, characterized in that, An electric switching valve is installed between the gas chamber outlet and the detection chamber inlet, and the electric switching valve is electrically connected to the main control module.

4. The volatile organic compound detection device according to claim 1, characterized in that, Each inlet and outlet of the gas chamber and the detection chamber is equipped with a valve, and the valve is electrically connected to the main control module.

5. The volatile organic compound detection device according to claim 1, characterized in that, A pre-filter is installed between the air inlet and the air pump.

6. The volatile organic compound detection device according to claim 2, characterized in that, The infrared laser and photon sensor are located inside the detection cavity.

7. The volatile organic compound detection device according to claim 1, characterized in that, The device body is also equipped with a nitrogen inlet.

8. The volatile organic compound detection device according to claim 7, characterized in that, The detection chamber is provided with a fluid inlet that is connected to the nitrogen inlet.

9. The volatile organic compound detection device according to claim 1, characterized in that, The outer surface of the device body is also provided with a display screen that is electrically connected to the main control module.

10. The volatile organic compound detection device according to claim 9, characterized in that, The display screen is an LCD backlit display.

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