Infrared gas sensor with strong anti-interference capability

Abstract

The utility model belongs to the technical field of gas detection, and particularly relates to an infrared gas sensor with strong anti-interference capability. Comprising a base, a head cover, an infrared gas sensor body, an adsorbent, an isolating membrane and a protective mounting net, the infrared gas sensor body is mounted in the base, the head cover is mounted at one end of the base, the isolating membrane is mounted at a gas inlet and a gas outlet of the infrared gas sensor body, and the adsorbent is mounted in the protective mounting net. The protective mounting net is mounted between the head cover and the base, and the adsorbent is arranged between the isolating membrane and the protective mounting net. Through the synergistic effect of all the components, the anti-interference capability of the infrared gas sensor is effectively improved, and the accuracy and the reliability of a detection result are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas detection, and in particular relates to an infrared gas sensor with strong anti-interference ability. Background Art

[0002] Accurately detecting gas composition and concentration is crucial in many fields such as industrial production and environmental monitoring. Common flammable and explosive gases, the leakage of which may cause serious safety accidents.

[0003] Currently, the main gas detection methods include catalytic combustion, thermal conductivity, optical interference, and infrared absorption. Compared to other detection methods, infrared absorption offers advantages such as high reliability, high precision, good selectivity, resistance to poisoning, long life, minimal environmental impact, and independence from oxygen. Therefore, infrared gas detection devices utilizing the infrared absorption principle possess unique advantages, are highly favored by users, and are increasingly being used.

[0004] However, the presence of interfering gases such as acetic acid, ethanol, and water vapor poses a huge challenge to accurate gas detection. Methane is a common flammable and explosive gas, but the near-infrared spectrum of acetic acid highly overlaps with that of methane, making it difficult for traditional infrared gas detection devices to effectively distinguish between the two, resulting in deviations and false alarms in detection results. In environments with high humidity, the performance of infrared sensors will be greatly affected. High humidity will increase the moisture content in the air, affecting the propagation and reception of infrared radiation, and the signal will be attenuated due to moisture absorption; high humidity will lead to a poor signal-to-noise ratio, and the signal will be distorted after amplification, affecting the accuracy and stability of the infrared sensor; when the humidity is high, moisture will condense on the surface of the infrared optical element, reducing its transmittance and reflectivity, affecting the sensitivity and accuracy of the infrared sensor.

[0005] With the rapid development of industry and increasingly stringent environmental protection requirements, higher demands are being placed on the performance and accuracy of gas detection devices. National standards clearly stipulate that methane sensors must be able to resist interference from acetic acid and ethanol gases. Therefore, the development of infrared gas detection devices with high interference resistance is particularly important. Summary of the Invention

[0006] The utility model provides an infrared gas sensor with strong anti-interference ability, which can improve the anti-interference ability of the infrared gas sensor, ensure the accuracy and reliability of the detection result, and solve the technical problems existing in the background technology.

[0007] The technical solution of the utility model is as follows: An infrared gas sensor with strong anti-interference ability includes: a base, a head cover, an infrared gas sensor body, an adsorbent, an isolation membrane and a protective mounting net. The infrared gas sensor body is installed in the base, the head cover is installed at one end of the base, the isolation membrane is installed at the gas inlet and outlet position of the infrared gas sensor body, the protective mounting net is installed between the head cover and the base, and the adsorbent is arranged between the isolation membrane and the protective mounting net.

[0008] Furthermore, an external thread is provided on the outer wall of the base.

[0009] Furthermore, the adsorbent is alumina balls.

[0010] Furthermore, a sealing component is provided at one end of the base facing away from the head cover, and the wires of the infrared gas sensor body pass through the sealing component.

[0011] Furthermore, the isolation membrane is a waterproof and breathable membrane.

[0012] Furthermore, the infrared gas sensor body is fixed in the base via an O-ring.

[0013] Furthermore, the end of the head cover facing away from the base is trumpet-shaped.

[0014] Furthermore, the infrared gas sensor body includes a circuit board, and an infrared probe and an air chamber arranged on the upper surface of the circuit board. The air chamber is a hollow structure, the infrared probe is arranged in the air chamber, an air inlet is opened at the bottom of the air chamber, and the isolation membrane is arranged at the bottom of the air chamber.

[0015] Beneficial effects of the present invention: The base of the present invention provides a stable foundation and protective space for the entire sensor. The hood and the base cooperate to form a gas channel, ensuring the orderly flow of the target gas. The protective mounting net can block the influence of external mechanical impact, the activated alumina balls effectively absorb interfering gases and water vapor, and the waterproof and breathable membrane prevents water droplets and dust from entering, creating a good working environment for the sensor. The infrared gas sensor detects the concentration of the target gas and outputs a signal. The O-ring and sealing material ensure the stability and safety of the sensor and the wires. The wires promptly transmit the detection signal to the back-end equipment for processing. Through the synergistic effect of the above-mentioned components, the present invention effectively improves the anti-interference ability of the infrared gas sensor and ensures the accuracy and reliability of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the present utility model.

[0017] Figure 2 It is an exploded view of the present utility model. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts should fall within the scope of protection of the present invention.

[0019] In an embodiment of the present invention, Figure 1 and Figure 2 The utility model provides a structural diagram of an infrared gas sensor with strong anti-interference ability according to the specific structure.

[0020] The present invention can be applied to combustible gas detection scenarios. For example, it can be installed in industrial sites such as the petrochemical industry where combustible gas leaks may occur to detect combustible gas leaks in the environment. Combustible gas is the target gas detected by the infrared gas detection device, and the main component of the combustible gas is the target gas component detected by the infrared gas detection device. The target gas component (or target gas) can be, for example, methane.

[0021] like Figure 1 and Figure 2 As shown, the utility model specifically includes: a base 1, a head cover 2, an infrared gas sensor body 6, an adsorbent 4, an isolation film 5 and a protective installation net 3.

[0022] The base 1 is used to accommodate and protect all the hardware structures of the device. The outer wall of the base 1 is provided with external threads, providing a standard threaded interface for connection, providing a stable foundation and protective space for the entire device. By providing a standard threaded interface, it is convenient to connect with external equipment, ensuring the stability of the device and the convenience of installation.

[0023] The infrared gas sensor body 6 is installed in the base 1. As a core component, the infrared gas sensor body 6 can accurately detect the concentration of the target gas and output a corresponding detection signal.

[0024] The hood 2 is mounted on one end of the base 1, wherein the end of the hood 2 facing away from the base 1 is trumpet-shaped. The hood 2 is tightly fitted on the base 1 and clamped together with the base 1 to install the protective net, providing a gas channel for the infrared gas sensor and ensuring orderly gas flow.

[0025] The protective mounting net 3 is installed between the head cover 2 and the base 1 to provide mechanical protection and explosion-proof protection for the infrared gas sensor, block external mechanical impact and explosion effects, and wrap and fix the adsorbent 4.

[0026] The adsorbent 4 is disposed between the isolation membrane 5 and the protective mounting screen 3. Specifically, the adsorbent 4 can be alumina spheres. Activated alumina spheres, placed between the protective screen and the infrared gas sensor, have a diameter of 0.5-1.0 mm. Their strong adsorption capacity effectively absorbs interfering gases and water vapor, improving the infrared gas sensor's accuracy in detecting target gases. The main industrial applications of activated alumina as adsorbent 4 include gas drying, liquid drying, water purification, selective adsorption in the petroleum industry, and chromatography separation processes.

[0027] Because activated alumina has a strong affinity for water, it is widely used in gas drying. Gases that can be dried with activated alumina include: acetylene, cracked gas, coke oven gas, hydrogen, oxygen, air, ethane, hydrogen chloride, propane, ammonia, ethylene, hydrogen sulfide, propylene, argon, methane, sulfur dioxide, carbon dioxide, natural gas, helium, nitrogen, chlorine, etc.

[0028] The isolation membrane 5 is installed at the gas inlet and outlet of the infrared gas sensor body 6. Specifically, it can be a waterproof and breathable membrane. The waterproof and breathable membrane works due to its unique microporous structure. These micropores are small enough to prevent the entry of water droplets and larger dust particles, but large enough to allow the target gas molecules to pass freely. This ensures the normal flow of gas while preventing interference from liquid and solid impurities.

[0029] The waterproof and breathable membrane is pasted on the gas inlet and outlet of the infrared gas sensor. It has good waterproof performance and can prevent water droplets from entering the gas chamber. At the same time, it can ensure the normal circulation of gas and avoid interference of dust and other impurities on the sensor.

[0030] A sealing assembly 7 is provided at the end of the base 1 facing away from the hood 2. The wires 8 of the infrared gas sensor body 6 extend through the sealing assembly 7. The wires 8 are used to transmit the detection signal output by the infrared gas sensor to the back-end equipment for processing. The sealing assembly 7 is used to seal the back end of the base 1, providing mechanical and explosion-proof protection for the infrared gas sensor and wires 8, preventing external factors from affecting the internal components. The sealing assembly 7 is composed of a sealing material.

[0031] The infrared gas sensor body 6 is fixed in the base 1 via an O-ring 9. The O-ring 9 is used to firmly fix the infrared gas sensor in the base 1, ensuring that the sensor does not move during operation and ensuring the accuracy and stability of detection.

[0032] During installation, first adhere the waterproof, breathable membrane to the infrared gas sensor's gas inlet and outlet. Then, connect the infrared gas sensor body with a wire 8 of appropriate length. Securely mount the infrared gas sensor body 6, with the wire 8 connected, inside the base 1, 1 mm below the air inlet, using an O-ring. Evenly place the activated alumina spheres on the waterproof, breathable membrane. Then, place the protective net over the base 1, ensuring that the activated alumina spheres are located between the net and the infrared gas sensor. Next, tightly fit the hood 2 onto the base 1, clamping the net together with the base 1 to form a complete gas passage. A sealing assembly 7 is used at the rear end of the base 1 to provide mechanical and explosion-proof protection for the infrared gas sensor and wire 8.

[0033] In this embodiment, the infrared gas sensor body 6 includes a circuit board, and an infrared probe and an air chamber arranged on the upper surface of the circuit board. The air chamber is a hollow structure, the infrared probe is arranged in the air chamber, and an air inlet is opened at the bottom of the air chamber. The isolation membrane 5 is arranged at the bottom of the air chamber, completely covering the air inlet, and is used to filter out moisture in the gas entering the air inlet.

[0034] When the infrared methane sensor in this embodiment is working, the gas enters the gas chamber through the activated alumina balls and the waterproof breathable membrane; if the gas is mixed with acetic acid and / or ethanol gas, the acetic acid and / or ethanol gas is adsorbed and filtered by the activated alumina balls, so that the acetic acid and / or ethanol gas cannot pass through the activated alumina balls to reach the sensing area of ​​the infrared methane sensor, thereby not interfering with the normal operation of the infrared methane sensor; in addition, since the activated alumina balls do not adsorb methane, methane will reach the sensing area of ​​the infrared methane sensor and will not affect the detection accuracy and sensitivity of the infrared methane sensor.

[0035] The use of the solution of the present utility model can effectively improve the interference of acetic acid, ethanol, water vapor, etc. on the infrared gas detection device, and improve the detection accuracy of the target gas component. Specifically, by adding activated alumina balls to the gas flow path to prevent interfering gases from entering the gas chamber, the problem of interference of interfering gases on the target gas components when the infrared gas sensor performs gas detection is solved from the source. Furthermore, activated alumina has the advantages of small size and low cost, and is easy to install and disassemble on the infrared gas detection device. As a result, interference can be effectively isolated without significantly changing the internal structure of the infrared gas detection device, and the manufacturing cost of the infrared gas detection device will not increase sharply.

[0036] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to examples, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An infrared gas sensor with strong anti-interference ability, characterized in that: include: A base (1), a head cover (2), an infrared gas sensor body (6), an adsorbent (4), an isolation membrane (5) and a protective mounting net (3), wherein the infrared gas sensor body (6) is installed in the base (1), the head cover (2) is installed at one end of the base (1), the isolation membrane (5) is installed at the gas inlet and outlet position of the infrared gas sensor body (6), the protective mounting net (3) is installed between the head cover (2) and the base (1), and the adsorbent (4) is arranged between the isolation membrane (5) and the protective mounting net (3).

2. The infrared gas sensor with strong anti-interference ability as claimed in claim 1, characterized in that: An external thread is provided on the outer wall of the base (1).

3. The infrared gas sensor with strong anti-interference ability as claimed in claim 1, characterized in that: The adsorbent (4) is alumina balls.

4. The infrared gas sensor with strong anti-interference ability as claimed in claim 1, characterized in that: A sealing component (7) is provided at one end of the base (1) facing away from the head cover (2), and a wire (8) of the infrared gas sensor body (6) passes through the sealing component (7).

5. The infrared gas sensor with strong anti-interference ability as claimed in claim 1, characterized in that: The isolation membrane (5) is a waterproof and breathable membrane.

6. The infrared gas sensor with strong anti-interference ability as claimed in claim 1, characterized in that: The infrared gas sensor body (6) is fixed in the base (1) via an O-ring (9).

7. The infrared gas sensor with strong anti-interference ability as claimed in claim 1, characterized in that: The end of the head cover (2) facing away from the base (1) is trumpet-shaped.

8. The infrared gas sensor with strong anti-interference capability as claimed in claim 1, characterized in that: The infrared gas sensor body (6) comprises a circuit board, an infrared probe and an air chamber arranged on the upper surface of the circuit board, the air chamber is a hollow structure, the infrared probe is arranged in the air chamber, an air inlet is opened at the bottom of the air chamber, and the isolation membrane (5) is arranged at the bottom of the air chamber.

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