Detection equipment for methane and non-methane hydrocarbon in ambient air

Abstract

The utility model discloses detection equipment for methane and non-methane hydrocarbon in ambient air. The detection equipment comprises detection equipment and a sampling pipe, by the adoption of the adjusting disc and the airflow sensors, when ambient air is guided in, the airflow in unit time can be detected through the multiple sets of airflow sensors, the actual use condition of the screen is judged according to the change of the airflow, and when dust blocked on the surface of the screen is much, the screen is prevented from being damaged. The adjusting disc can be driven to rotate in the fixing disc through operation of the motor, then the unused screen is moved to the circulating groove, the used screen can be stored in the containing groove, follow-up treatment is facilitated, and due to the fact that the multiple sets of screens are independent of one another, and the upper screen and the lower screen are not directly connected, the screening efficiency is greatly improved. Therefore, interference cannot be generated during adjustment, the adjusting effect of the screen cloth is guaranteed, better use is facilitated, and the screen cloth adjusting device has the advantages of being small in adjusting influence and small in interference between the screen cloth.

Description

Technical Field

[0001] This utility model relates to the field of atmospheric environment detection equipment technology, specifically to a detection device for methane and non-methane total hydrocarbons in ambient air. Background Technology

[0002] When the concentration of non-methane hydrocarbons (NMHC) in the atmosphere exceeds a certain level, in addition to being directly harmful to human health, it can also produce photochemical smog under certain conditions when exposed to sunlight, causing harm to the environment and humans. Methane, as a component of this smog, is important for a comprehensive understanding of ambient air conditions. By detecting the content of methane and NMHC in ambient air, it can be used to assess the degree of air pollution and monitor air quality.

[0003] The existing publicly available technology, application number CN202111009877.3, discloses a device for determining the non-methane total hydrocarbon content in ambient air. The device includes a detection device and a sampling device, comprising a sampling box, a screening mechanism, and an extraction device. The sampling box is installed on the top wall of the detection device, and its inner cavity is connected to the air inlet of the detection device. The extraction device is installed at the bottom of the inner cavity of the sampling box. The screening mechanism is installed at the top of the inner cavity of the sampling box. The screening mechanism includes a screening component slidably installed at the top of the inner cavity of the sampling box. A buffer spring is used in the device to buffer the flow, reducing the pressure on the screen when there is a large accumulation of impurities above the screening component, thus reducing the probability of the screen bending and deforming. This prevents the screen aperture from increasing and affecting the quality of filtration, ensuring the service life of the sampling device.

[0004] However, the aforementioned patent still has certain drawbacks in its use: although it can achieve continuous filtration of impurities by setting multiple sets of screens and pulling out the screens, the multiple sets of screens are stacked together during use, which can easily cause multiple sets of screens to become clogged at the same time. At this time, simply pulling out the screens cannot effectively ensure smooth gas flow, thus affecting the subsequent detection effect of ambient air and the use of the device. Moreover, the stacking of multiple sets of screens also increases the mutual interference effect, making it easy for impurities to be transferred between each other and causing damage to the screen structure below due to their own weight, affecting the quality of subsequent use. At the same time, the filter structure is simple, and the blocking and filtering effect it can play is very limited, which is not conducive to better filtering of impurities in the air and thus ensuring the subsequent detection effect. The overall use effect is not ideal.

[0005] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides a detection device for methane and non-methane total hydrocarbons in ambient air, which has the advantages of good filtration effect, small adjustment impact, and small interference between screens, thereby solving the problems mentioned in the background technology.

[0008] (II) Technical Solution

[0009] To achieve the advantages of good filtration effect, minimal adjustment impact, and minimal interference between screens, the specific technical solution adopted by this utility model is as follows:

[0010] A detection device for methane and non-methane total hydrocarbons in ambient air includes a detection device and a sampling tube. The sampling tube is connected to the air inlet of the detection device. Several sets of fixed disks are evenly installed inside the sampling tube. An adjusting disk is rotatably connected inside the fixed disk. The adjusting disk is connected to a motor through one side of the fixed disk at its center. Several sets of docking grooves are evenly opened on the surface of the adjusting disk. A screen is installed at the bottom of the docking groove. A flow groove is opened on the surface of the adjusting disk. Fixed rods are installed between the fixed disks. Several sets of airflow sensors are symmetrically arranged on the surface of the fixed rods.

[0011] Furthermore, an air inlet is provided at the top of the sampling tube.

[0012] Furthermore, the sampling tube has several sets of air supply ports at the contact position with the air inlet of the detection equipment, and a fan is installed inside the air supply port.

[0013] Furthermore, the aperture size of the screen surface gradually decreases.

[0014] Furthermore, accommodating grooves are symmetrically formed on both sides of the flow channel inside the fixed disk.

[0015] Furthermore, the dimensions of the flow channel and the receiving channel are both larger than the dimensions of the docking channel.

[0016] Furthermore, several sets of metal strips are provided at the bottom of the docking groove.

[0017] Furthermore, the surface of the detection device is equipped with a controller.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, this utility model provides a detection device for methane and non-methane total hydrocarbons in ambient air, which has the following beneficial effects:

[0020] (1) This utility model adopts an adjustment disc and an airflow sensor. When introducing ambient air, multiple airflow sensors can detect the airflow rate per unit time and judge the actual use of the screen based on the change in airflow rate. When there is a lot of dust blocked on the screen surface, the motor can drive the adjustment disc to rotate inside the fixed disc, thereby moving the unused screen to the flow channel, while the used screen can be stored in the receiving channel for convenient subsequent processing. Since the multiple screens exist independently and there is no direct connection between the upper and lower screens, there will be no interference during adjustment, thus ensuring the adjustment effect of the screen and making it easier to use. It has the advantages of small adjustment impact and small interference between screens.

[0021] (2) This utility model uses a sieve. During operation, the sieve can filter impurities in the air, avoiding the presence of impurities from affecting the accuracy of subsequent detection. Since the sieve has a multi-layer structure with gradually smaller mesh size in each layer, it can filter out impurities in the air more effectively, improve the overall filtration effect, and has the advantage of good filtration effect. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a detection device for methane and non-methane total hydrocarbons in ambient air proposed in this utility model;

[0024] Figure 2 These are schematic diagrams illustrating various embodiments of the fixing plate of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the adjustment disc of this utility model;

[0026] Figure 4 These are schematic diagrams illustrating various embodiments of the sampling tube of this utility model.

[0027] In the picture:

[0028] 1. Detection equipment; 2. Sampling tube; 3. Airflow sensor; 4. Fixing plate; 5. Air inlet; 6. Screen; 7. Motor; 8. Flow channel; 9. Fixing rod; 10. Fan; 11. Air supply port; 12. Receiving tank; 13. Adjusting plate; 14. Connecting groove. Detailed Implementation

[0029] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0030] According to an embodiment of the present invention, a detection device for methane and non-methane total hydrocarbons in ambient air is provided.

[0031] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-4 As shown, a detection device for methane and non-methane total hydrocarbons in ambient air according to an embodiment of the present invention includes a detection device 1 and a sampling tube 2. The sampling tube 2 is connected to the air inlet end of the detection device 1. Several sets of fixed disks 4 are evenly installed inside the sampling tube 2. An adjusting disk 13 is rotatably connected inside the fixed disks 4. The middle of the surface of the adjusting disk 13 passes through one side of the fixed disk 4 and is connected to a motor 7. Several sets of docking grooves 14 are evenly opened on the surface of the adjusting disk 13. A screen 6 is installed at the bottom of the docking groove 14. A flow groove 8 is opened on the surface of the adjusting disk 13. A fixing rod 9 is installed between the disks 4. Several sets of airflow sensors 3 are symmetrically arranged on the surface of the fixing rod 9. The detection device 1 uses chromatographic separation technology to separate methane in the gas to be tested and detects it separately using a hydrogen flame ionization detector. At the same time, the total hydrocarbons in the gas to be tested are also detected using a hydrogen flame ionization detector. The total hydrocarbon concentration is obtained by subtracting the methane concentration from the total hydrocarbon concentration. This method is existing technology and will not be described in detail. Meanwhile, the airflow sensor 3 is a device that can measure gas flow rate, velocity and direction. The technology is mature and will not be elaborated on further.

[0032] In one embodiment, an air inlet 5 is provided at the top of the sampling tube 2. The air inlet 5 is provided to facilitate the introduction of air, thereby facilitating the detection by the detection device 1.

[0033] In one embodiment, a number of air supply ports 11 are provided at the contact position between the sampling tube 2 and the air inlet end of the detection device 1. A fan 10 is installed inside the air supply port 11. The fan 10 is provided to introduce external air into the detection device 1 to facilitate the detection operation of the detection device 1.

[0034] In one embodiment, the aperture size of the screen 6 gradually decreases. The change in the size of the screen 6 is to filter impurities in the air more precisely, thereby improving the effect of subsequent detection.

[0035] In one embodiment, accommodating grooves 12 are symmetrically provided on both sides of the flow channel 8 inside the fixed plate 4. The accommodating grooves 12 are provided to facilitate the storage of the screen 6 after use, so as to avoid the screen 6 being exposed and affecting the filtration effect of the screen 6 in other positions.

[0036] In one embodiment, the dimensions of the flow channel 8 and the receiving channel 12 are both larger than the dimensions of the docking channel 14. The dimensions of the flow channel 8 and the receiving channel 12 are set to ensure that the docking channel 14 can be smoothly enclosed, thereby realizing the storage of the screen 6 inside the docking channel 14. This allows unused screens 6 to filter impurities in the air smoothly when entering the flow channel 8, while used screens 6 can be smoothly stored in the receiving channel 12 to avoid exposure and thus avoid affecting the air processing operation of other screens 6. Furthermore, the number of flow channels 8, the number of receiving channels 12, the number of docking channels 14, and the number of air inlets 5 can all be adjusted according to requirements, which will not be elaborated further here.

[0037] In one embodiment, several sets of metal strips are provided at the bottom of the docking groove 14. The metal strips are provided to support the screen 6 and do not affect the normal filtration effect of the screen 6.

[0038] In one embodiment, the surface of the detection device 1 is provided with a controller, which is a basic component of the detection device 1. Since there are various types of controllers and the application technology is mature, personnel can select one according to their needs and implement it through programming. This will not be elaborated on further here.

[0039] Working Principle: In actual use, ambient air is introduced into the detection device 1 through sampling tube 2. The detection device 1 then detects methane and non-methane total hydrocarbons in the ambient air. (Detection device 1 uses chromatographic separation technology to separate methane from the gas being tested, which is then detected separately using a flame ionization detector. Simultaneously, the total hydrocarbons in the gas are also detected using a flame ionization detector. The concentration of non-methane total hydrocarbons is obtained by subtracting the methane concentration from the total hydrocarbon concentration. This method is existing technology and therefore will not be described in detail.) While the ambient air is introduced through sampling tube 2, impurities in the air are filtered through screen 6 to prevent them from affecting the accuracy of subsequent detections. Because screen 6 has a multi-layered structure with gradually decreasing pore size in each layer, it can more effectively filter out impurities in the air, improving the overall filtration effect. Additionally, an airflow sensor 3 is installed between each layer to detect the airflow rate. The presence or absence of blockage in screen 6 further influences the detection process. The airflow rate varies when the screen is blocked, so the usage status of the screen 6 can be determined by the change in airflow rate. When the airflow rate is less than the preset range, the motor 7 at the corresponding position is triggered to rotate, which in turn drives the adjusting plate 13 to rotate. At this time, the adjusting plate 13 can rotate inside the fixed plate 4, thus collecting the used screen in the receiving groove 12, while the unused screen 6 can be guided out of the flow groove 8, thus performing air filtration. The screen 6 at the corresponding position can be adjusted according to the detection effect of the airflow sensor 3 at different positions. Since there is no direct contact between the screens 6, multiple sets can be provided, so timely adjustments can be made according to the actual usage situation without synchronous blockage, ensuring the usage effect of the screen 6, reducing interference between the screens 6, and improving the overall usage effect. Then, the air that has been treated for impurity removal can be introduced into the detection device 1 by the fan 10 for detection. The device as a whole has the advantages of good filtration effect, small adjustment impact, and small interference between the screens 6.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for detecting methane, non-methane total hydrocarbons in ambient air, comprising a detection device (1) and a sampling tube (2), characterized in that, The detection equipment (1) is provided with a sampling pipe (2) at the air inlet end position, a plurality of groups of fixed discs (4) are uniformly arranged inside the sampling pipe (2), an adjusting disc (13) is rotatably connected to the inside of the fixed disc (4), the middle position of the surface of the adjusting disc (13) is penetrated through one side of the fixed disc (4) and connected with a motor (7), a plurality of groups of butt grooves (14) are uniformly arranged on the surface of the adjusting disc (13), a screen (6) is arranged at the bottom end inside the butt groove (14), a flow-through groove (8) is arranged on the surface of the adjusting disc (13), a fixed rod (9) is arranged between the fixed discs (4), and a plurality of groups of air flow sensors (3) are symmetrically arranged on the surface of the fixed rod (9).

2. The device for detecting methane and non-methane total hydrocarbons in ambient air according to claim 1, characterized in that, An air inlet (5) is arranged at the top of the sampling pipe (2).

3. The device for detecting methane and non-methane total hydrocarbons in ambient air according to claim 1, characterized in that, A plurality of groups of air supply openings (11) are arranged at the contact position of the sampling pipe (2) and the air inlet end of the detection equipment (1), and a fan (10) is arranged inside the air supply opening (11).

4. The device for detecting methane and non-methane total hydrocarbons in ambient air according to claim 1, characterized in that, The aperture size of the screen (6) gradually decreases.

5. The device for detecting methane and non-methane total hydrocarbons in ambient air according to claim 1, characterized in that, Accommodation grooves (12) are symmetrically arranged at the inside of the fixed disc (4) on both sides of the flow-through groove (8).

6. The device for detecting methane and non-methane total hydrocarbons in ambient air according to claim 1, characterized in that, The size of the flow-through groove (8) and the size of the accommodation groove (12) are both greater than the size of the butt groove (14).

7. The device for detecting methane and non-methane total hydrocarbons in ambient air according to claim 1, characterized in that, A plurality of groups of metal strips are arranged at the bottom of the butt groove (14).

8. The device for detecting methane and non-methane total hydrocarbons in ambient air according to claim 1, characterized in that, A controller is arranged on the surface of the detection equipment (1).

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