Composite gas detection device with dustproof structure

Abstract

The invention belongs to the technical field of gas detection devices, and particularly relates to a composite gas detection device with a dustproof structure, which comprises a main circuit board, a detection mechanism and a negative pressure mechanism, the detection mechanism detects the to-be-detected gas and generates a detection result; the negative pressure mechanism comprises an air suction assembly and an exhaust assembly and further comprises a first filter assembly arranged in the air suction assembly, and the first filter assembly is arranged at the end close to the air suction opening and comprises a filter cylinder and a first filter screen arranged in the filter cylinder. The outer side wall of the filter cylinder is in threaded connection with the inner wall of a gas transmission channel of the gas suction assembly, second-stage filtration of dust is achieved through the first filter assembly arranged on the gas suction assembly, and in order to further consider that the diameters of different dust particles are different, multiple layers of filter screens are designed; and the pore size of each layer of filter screen is reduced once from outside to inside, so that dust with different diameters can be accurately filtered.

Description

Technical Field

[0001] The invention belongs to the technical field of gas detection devices, and in particular relates to a composite gas detection device with a dustproof structure. Background Art

[0002] In the field of petrochemicals, gas detection devices are often used to monitor the concentration of volatile organic compounds (VOCs) in the production environment or toxic and harmful gases such as CO produced by incomplete combustion of fuel to ensure production safety. Gas detection devices mainly rely on the interaction between the sensitive elements in the sensor and the gas molecules to induce physical or chemical changes, which are then sensed by the detector and converted into measurable signals. Moreover, the sensing probes of both electrochemical and catalytic combustion sensors must be directly exposed to the air so that the measured gas can diffuse into the specific sensitive elements inside the sensor before the sensor can achieve sensing.

[0003] However, in the process of producing or processing chemical raw materials, there are a large number of transport vehicles loading or unloading. The transport vehicles will raise or attach a lot of dust. In addition, due to the dense equipment or frequent operations here, a large amount of dust and particulate matter is easily generated. The dust attached to the surface of the sensor will hinder the effective contact between the gas molecules and the sensor's sensitive elements, causing the sensor's response to the target gas to be weakened and the sensitivity to be reduced, which directly affects the accuracy of detection. Moreover, due to the interference of dust, a certain degree of dust will adhere to the detection head of the sensor. The attached dust will affect the accuracy of the sensor, and then it will be unable to accurately identify the true concentration of the target gas, thereby causing false alarms or missed alarms, causing danger.

[0004] However, in areas where chemical raw materials are produced or processed, there is a lot of dust in the air and the diameters of the dust or particles suspended in the air vary greatly. The dust-proof structure of detectors used in the chemical field under the existing technology generally uses a graded or single-stage dust-proof structure, but each stage of the filtering structure generally uses a filter with a uniform aperture or a single filtering structure. If the filter used in the filtering structure has a small aperture, then particles with a slightly larger diameter, such as dust and sand from the ground, are extremely easy to adhere to the filter, causing the filter to be blocked and affecting the subsequent filtering effect. However, using a filter with a larger aperture cannot effectively filter dust with a tiny diameter, such as metal particles, which affects the filtering effect of the device on dust.

[0005] Therefore, a composite gas detection device with a dustproof structure is needed to solve the above problems. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a composite gas detection device with a dustproof structure, which solves the problem that due to the different diameters of dust or particles in the environment where the detection device is used, step-by-step filtering is required to achieve accurate filtration.

[0007] The object of the present invention can be achieved by the following technical solutions: A composite gas detection device with a dustproof structure, comprising a main circuit board and a detection mechanism and a negative pressure mechanism installed on the main circuit board, wherein a controller is provided on the main circuit board, and the controller is electrically connected to the detection mechanism and the negative pressure mechanism respectively;

[0008] The detection mechanism detects the gas to be detected and generates a detection result;

[0009] The negative pressure mechanism comprises an air suction component and an exhaust component, wherein the air suction component and the exhaust component are connected to the outside through an air suction opening and an exhaust opening respectively, wherein the air suction component is used to suck the gas to be detected into the interior of the detection mechanism, and the exhaust component is used to exhaust the gas that has been detected in the interior of the detection mechanism;

[0010] It also includes a first filter component arranged in the air intake component, the first filter component is arranged near one end of the air intake opening, the first filter component includes a filter cylinder and a first filter screen arranged in the filter cylinder, and the outer wall of the filter cylinder is threadedly connected to the inner wall of the gas transmission channel of the air intake component.

[0011] Preferably, the first filter assembly includes multiple layers of first filter screens, each layer of the filter screens is evenly distributed with mesh holes of the same aperture, and the aperture holes on each layer of the first filter screens are different, and the aperture decreases layer by layer from the outside to the inside of the air intake assembly.

[0012] Preferably, it also includes a shell, which is provided with a plurality of detection ports, and a second filter component is arranged at the opening of the detection port. The second filter component has the same structure as the first filter component, and the second filter component includes a second filter net, and the mesh diameter of the second filter net is larger than the diameter of the first filter net.

[0013] Preferably, a silica gel adsorption cotton layer is further provided on the side of the second filter component close to the main circuit board.

[0014] Preferably, the detection mechanism includes a detection cavity and a plurality of detection components connected to the detection cavity through different detection channels, respectively, and the plurality of detection components can respectively detect multiple types of gases.

[0015] Preferably, it further comprises an enhancement component electrically connected to the controller, wherein the enhancement component comprises a heating component, and the heating component is controlled by the controller to heat the detection gas in the detection chamber.

[0016] Preferably, it also includes a temperature detection component, which is electrically connected to the controller and uploads data. The temperature detection component is used to detect the temperature in the detection cavity, and the controller controls the heating component according to the measurement value of the temperature detection component.

[0017] Preferably, the enhancement component also includes a signal amplifier.

[0018] Preferably, it also includes an alarm mechanism, which includes a circuit fault alarm component and a detection alarm component;

[0019] The detection alarm component is electrically connected to the controller and is controlled by it, and controls the detection alarm component to alarm when the content of harmful gas in the gas to be detected exceeds a set value;

[0020] The circuit fault detection component includes a detection circuit arranged on a main circuit board and a signal lamp responding to an alarm signal of the detection circuit.

[0021] Preferably, it also includes a communication component electrically connected to the controller, and the communication component and the main circuit board are detachably connected, the communication component is used to transmit the detection results of the detection mechanism received by the controller, and the communication component is connected to the host computer and feeds back the detection results to the host computer.

[0022] The beneficial effects of the present invention are:

[0023] The first stage filtration of particles with large diameters is achieved through the second filter component arranged on the outer shell, and the second stage filtration of dust is achieved through the first filter component arranged on the air intake component. In order to further take into account that the diameters of different dust particles are also different, multiple layers of filter screens are designed, and the pore size of each layer of filter screens decreases from the outside to the inside, so as to achieve accurate filtration of dust with different diameters. In addition, the silica gel adsorption cotton is arranged to absorb water vapor in the air, reduce the contact between water vapor in the air and the probe of the detection component, and reduce the adverse effect of water vapor on the sensitivity of the detection component. The threaded connection relationship between the filter component and the corresponding structure makes disassembly easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a structural diagram of the present invention after removing the outer shell;

[0026] Figure 2 is a system block diagram of the controller of the present invention;

[0027] Figure 3 is an external structural diagram of the present invention (without showing the detection port);

[0028] Main component symbols

[0029] In the figure: 1. Negative pressure mechanism; 2. Detection component; 3. Communication component interface; 4. ALED lamp; 5. BLED lamp; 6. Housing. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0031] See also Figure 1-3 The present embodiment provides a composite gas detection device with a dustproof structure, including a main circuit board and a detection mechanism and a negative pressure mechanism 1 installed on the main circuit board; the detection mechanism realizes the detection of the gas to be detected. In the field of petrochemical industry, whether it is the acquisition of production raw materials or the by-products generated in various links of the production process, volatile organic compounds VOC or toxic and harmful gases such as CO generated by incomplete combustion of fuel may be generated. These toxic and harmful gases will cause great harm to the human body, and even endanger life in serious cases. In addition, in this working environment, there are VOC (volatile organic compounds), CH4 (methane), CO or other harmful gases, and the concentration of these harmful gases exceeds the set value, which is prone to danger. Therefore, the detection mechanism includes a detection chamber and a plurality of detection components 2 connected to the detection chamber through different detection channels, and the plurality of detection components 2 are respectively used to detect the concentrations of VOC (volatile organic compounds), CH4 (methane) and CO. The negative pressure mechanism 1 includes an air intake component and an exhaust component, and the air intake component and the exhaust component are respectively connected to the outside through an air intake opening and an exhaust opening, and the air intake component is used to inhale the gas to be detected into the interior of the detection component 2, and the exhaust component is used to exhaust the gas detected in the interior of the detection component 2;

[0032] Considering that there is a lot of dust in the working environment of the detection device, and the dust adheres to the probe of the detection component 2 and affects its sensitivity, it also includes a first filter component arranged in the air intake component, and a plurality of first filter screens are arranged in the first filter component, and the plurality of first filter screens can filter the dust in the gas to be detected that is transported to the detection mechanism via the air intake component, so as to achieve the effect of reducing dust. And since the general dust filter component is generally a consumable, the dust filter component needs to be replaced with the accumulation of time to ensure its ability to filter dust. The first filter component includes a filter cylinder and a first filter screen arranged in the filter cylinder, and the first filter screen here can adsorb dust of all sizes attached to the air, and the outer wall of the filter cylinder is threadedly connected to the inner wall of the gas transmission channel of the air intake component, and the first filter component is adapted to the thread of the inner wall of the gas transmission channel through the thread of its outer wall, that is, the first filter component can achieve a simple detachable connection with the air intake component, which is convenient for replacement.

[0033] The concentration of VOC is detected using a PID photoionization sensor. The PID photoionization sensor ionizes the gas to be detected, and the gas molecules form the original gas molecules after discharge, which is non-destructive to the original gas molecules. The light source inside the sensor ionizes the gas molecules into ions and electrons. These ions and electrons are collected in the electric field and generate current. The magnitude of the current is proportional to the gas concentration, thereby realizing the measurement of the VOC concentration. The concentration of CH4 (methane) is detected using an infrared methane sensor. The infrared methane sensor is developed based on the Beer-Lambert law and infrared spectrum theory, and its concentration is detected by measuring the absorption of methane gas to infrared light of a specific wavelength. The electrochemical sensor is used to detect CO (carbon monoxide). Three different harmful gases use three independent detection channels respectively, which do not interfere with each other. And because the detection conditions of different gases are different, the three detection components 2 can also be set with different reaction chambers respectively to better realize the detection of specific gases by different detection components 2.

[0034] In accordance with the above, since the diameters of particles existing in the chemical production and processing environment vary greatly, such as PM10, PM2.5 and PM0.1 classified by size, the first filter assembly is designed as a first filter mesh with multiple layers of consistent apertures, and the targeted filtering effect is poor. Therefore, the first filter assembly includes multiple layers of first filter meshes, and each layer of the filter meshes is evenly distributed with meshes of the same aperture, and the apertures of the meshes on each layer of the first filter meshes are different, and the apertures decrease layer by layer from the outside to the inside of the air intake assembly, thereby filtering particles in the PM10, PM2.5 and PM0.1 categories layer by layer. In order to increase the filtering effect on dust, an electrostatic adsorption layer and an adsorbent filter layer are added to the back of the first filter assembly relative to the last layer of the first filter mesh inside the device. The electrostatic adsorption layer realizes the adsorption of smaller dust or air attachments, and the adsorbent filter layer realizes the adsorption of chemical particles or chemical molecules generated by specific chemical products in the use environment by adjusting the adsorbent therein, so as to reduce the interference of the chemical molecules on the sensor probe.

[0035] In accordance with the above, since petrochemical enterprises often use fossil fuels such as coal, oil and natural gas as energy, the combustion of coal will produce a large number of particles with larger diameters. In these environments, when it is often necessary to monitor harmful gases, the first filter is designed to have a smaller aperture for better filtering, so the larger particles attached to the air are extremely adsorbed on it and blocked, so it needs to be replaced frequently, which is extremely inconvenient. As mentioned above, the aperture of the first filter is designed to filter the size of general fine dust. However, since coal will produce a large amount of large-sized smoke and coal particles during the combustion process, and the working environment of the detection device is also more and larger in size due to the operation of the machine, such as the PM10 category particles mentioned above, such larger particles need to be filtered first to avoid clogging the first filter. Therefore, the detection device also includes a housing 6, and the housing 6 is provided with a plurality of detection ports, and a second filter assembly is provided at the opening of the detection port. The second filter assembly has the same structure as the first filter assembly. The same structure here refers to the same design of the thread relationship, which is different from the multi-layer design of the first filter assembly proposed here before. The second filter component includes a second filter. The second dust filter is used to filter particles with larger diameters, such as dust or powder in the air. Therefore, the mesh diameter of the second filter is designed to be larger than the diameter of the first filter. The aperture of the second filter is designed to filter particles in the air that belong to the PM10 category.

[0036] Since the working environment of the detection device is in a humid environment such as the return of south wind or rainy weather, or its working environment is humid, the water vapor in the air will affect the sensitivity of the detection probe of the detection component 2. Therefore, a silica gel adsorption cotton is further provided on the side of the second filter component close to the main circuit board. The silica gel adsorption cotton is used to absorb water vapor in the air. The silica gel adsorption cotton is designed in the filter cylinder of the second filter component to dry the gas to be detected entering the detection device. The water vapor increases the adhesion of finer dust or particles entering the detection device, thereby reducing the adhesion of the aforementioned dust to the first filter net located in the first filter component, thereby reducing the blockage of the first filter net.

[0037] In order to further improve the efficiency of the detection component 2, it also includes an enhancement component electrically connected to the controller. Specifically, in a cold environment, the reaction time of the detection component 2 is improved. The enhancement component includes a heating component. The heating component is controlled by the controller to heat the detection gas in the detection chamber. The heating component can use a heating rod. It also includes a temperature detection component 2. The temperature detection component 2 is electrically connected to the controller and uploads data. The temperature detection component 2 is used to detect the temperature in the detection chamber. The controller controls the heating component according to the measurement value of the temperature detection component 2. By heating the gas in the detection chamber, the thermal motion speed of the gas molecules can be increased, making them more active. This increase in activity helps the gas molecules to react or adsorb more quickly with the active substances on the surface of the detection element, thereby accelerating the detection process. For example, for catalytic combustion or electrochemical detection components 2, heating can significantly increase the rate of these chemical reactions. Because the rate of a chemical reaction is usually proportional to the temperature, that is, the higher the temperature, the faster the reaction rate.

[0038] In order to further improve the detection accuracy, the enhancement component also includes a signal amplifier electrically connected to the detection component 2. The signal amplifier improves the signal quality of the detection component 2 by increasing gain, reducing signal loss, supporting multiple frequency bands, optimizing application scenarios, and adopting new technologies and new materials. These measures work together to enable the detection component 2 to accurately and stably receive and process signals in various complex environments.

[0039] In accordance with the above, it also includes an alarm mechanism, and the alarm component includes a circuit fault alarm component and a detection alarm component; the detection alarm component is electrically connected to the controller and is controlled by it, and controls the detection alarm component to alarm when the content of harmful gas in the gas to be detected exceeds the set value, and the detection alarm component uses an LED status light (ALED light 4 in the figure) to display to the operator; the circuit fault detection component includes a detection circuit arranged on the main circuit board and an LED status light (BLED light 5 in the figure) that responds to the alarm signal of the detection circuit, and the working colors of the signal lights of the detection alarm component and the circuit fault alarm component are different for easy distinction.

[0040] It also includes a communication component electrically connected to the controller, and the communication component and the detection device are detachably connected. The communication component is electrically connected to the detection device via a communication component interface 3 to achieve information acquisition. The communication component sends the detection results uploaded by the detection component 2 to a host computer connected to the communication component, so that the operator can better understand the detection results and make further more detailed judgments.

[0041] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A composite gas detection device with a dustproof structure, characterized in that: It comprises a main circuit board and a detection mechanism and a negative pressure mechanism installed on the main circuit board, wherein a controller is arranged on the main circuit board, and the controller is electrically connected to the detection mechanism and the negative pressure mechanism respectively; The detection mechanism detects the gas to be detected and generates a detection result; The negative pressure mechanism comprises an air suction component and an exhaust component, wherein the air suction component and the exhaust component are connected to the outside through an air suction opening and an exhaust opening respectively, wherein the air suction component is used to suck the gas to be detected into the interior of the detection mechanism, and the exhaust component is used to exhaust the gas that has been detected in the interior of the detection mechanism; It also includes a first filter component arranged in the air intake component, the first filter component is arranged near one end of the air intake opening, the first component includes a filter cylinder and a first filter screen arranged in the filter cylinder, and the outer wall of the filter cylinder is threadedly connected to the inner wall of the gas transmission channel of the air intake component.

2. A composite gas detection device with a dustproof structure according to claim 1, characterized in that: The first filter assembly includes multiple layers of first filter screens, each layer of which is evenly distributed with meshes of the same aperture, and the aperture of the meshes on each layer of the first filter screen decreases layer by layer from the outside of the device to the inside of the air intake assembly.

3. A composite gas detection device with a dustproof structure according to claim 2, characterized in that: It also includes a shell, which has a plurality of detection ports. A second filter component is arranged at the opening of the detection port. The second filter component has the same thread structure as the first filter component. The second filter component includes a second filter screen, and the mesh diameter of the second filter screen is larger than the diameter of the first filter screen.

4. A composite gas detection device with a dustproof structure according to claim 3, characterized in that: A silica gel adsorption cotton layer is also provided on a side of the second filter component close to the main circuit board.

5. The composite gas detection device with a dustproof structure according to claim 3, characterized in that: The detection mechanism includes a detection cavity and a plurality of detection components connected to the detection cavity through different detection channels, respectively, and the plurality of detection components can respectively detect multiple types of gases.

6. The composite gas detection device with a dustproof structure according to claim 1, characterized in that: It also includes an enhancement component electrically connected to the controller, and the enhancement component includes a heating component. The heating component is controlled by the controller to heat the detection gas in the detection chamber.

7. The composite gas detection device with a dustproof structure according to claim 5, characterized in that: It also includes a temperature detection component, which is electrically connected to a controller and uploads data. The temperature detection component is used to detect the temperature in the detection cavity, and the controller controls the heating component according to the measurement value of the temperature detection component.

8. The composite gas detection device with a dustproof structure according to claim 6, characterized in that: The enhancement component also includes a signal amplifier.

9. The composite gas detection device with a dustproof structure according to claim 1, characterized in that: Also included is an alarm mechanism, the alarm mechanism comprising a circuit fault alarm component and a detection alarm component; The detection alarm component is electrically connected to the controller and is controlled by it, and controls the detection alarm component to alarm when the content of harmful gas in the gas to be detected exceeds a set value; The circuit fault detection component includes a detection circuit arranged on a main circuit board and a signal lamp responding to an alarm signal of the detection circuit.

10. The composite gas detection device with a dustproof structure according to claim 1, characterized in that: It also includes a communication component electrically connected to the controller, and the communication component and the main circuit board are detachably connected. The communication component is used to transmit the detection results of the detection mechanism received by the controller. The communication component is connected to the host computer and feeds back the detection results to the host computer.

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