VOC gas purification structure
By adding a second filter at the output end of the first filter and using carbon rods or carbon particles with different angles or pore sizes, the problem of insufficient VOC adsorption capacity in the existing technology is solved, and VOC purification effect that meets the National VII emission standard is achieved on the basis of existing structure and materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAMEN XINYUAN ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-06-19
AI Technical Summary
Existing technologies require structural and material improvements to meet the China VII emission standards, resulting in additional R&D and mold costs, and making it difficult to increase VOC adsorption capacity in existing structures and materials.
A second filter is installed at the output end of the first filter, and carbon rods or carbon particles with different angles or pore sizes are used as filter media inside it to deviate the gas path from the axis of the gas chamber, prolong the residence time, and increase the adsorption capacity.
By altering the path to extend the gas residence time, the adsorption capacity of VOCs is improved, meeting the China VII emission standard without changing the existing structure and materials.
Smart Images
Figure CN224379947U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of exhaust emission control technology, and specifically refers to a VOC gas purification structure. Background Technology
[0002] The China VII emission standard is my country's seventh-stage emission standard for motor vehicles, aiming to reduce vehicle exhaust pollution through stricter environmental requirements. This standard is expected to be implemented as early as 2026, and will be a comprehensive upgrade based on EU standards (Euro VII) and California standards (Level 3), covering both light and heavy vehicles. It will also add controls on non-exhaust pollutants such as braking systems and tire wear. Specifically, the China VII emission standard specifies emission standards for refueling and daytime emissions. The former remains unchanged from the China VI standard at 0.05 g / L; the latter, compared to the China VI standard, has been tightened from 0.7 g / test to 0.35 g / test, and a BETP test has been added, requiring an emission limit of approximately 20 mg.
[0003] In existing technologies, manufacturers can reduce vehicle emissions during operation to meet new standards by installing more or more sophisticated filtration devices at the emission point to filter fuel vapor emissions. However, these methods involve improvements to structure and materials, requiring additional R&D and mold costs. Utility Model Content
[0004] The main purpose of this invention is to provide a VOC gas purification structure that solves the problems existing in the prior art and can increase the adsorption capacity of VOCs by using existing structures and materials.
[0005] To achieve the above objectives, the solution of this utility model is:
[0006] A VOC gas purification structure includes a first filter device and a second filter device; the input end of the first filter device is connected to the exhaust port of an oil tank; the second filter device is disposed at the output end of the first filter device, and includes a gas chamber through which gas passes, and a filter medium disposed in the gas chamber, the filter medium including at least a first filter medium and a second filter medium; when the gas passes through the junction between the first filter medium and the second filter medium, a path change occurs that deviates from the axis of the gas chamber.
[0007] The first filtration device is an activated carbon canister, and is provided with an exhaust port, an air inlet, and a cleaning port; the exhaust port is one output end of the first filtration device, and a second filtration device is provided thereon; the air inlet is the input end of the first filtration device; the cleaning port is the other output end of the first filtration device, and is used to connect a cleaning device.
[0008] Both the first and second filter media are carbon rods, each with honeycomb pores extending along its own axis. The installation angles of adjacent carbon rods are different to create an included angle between the honeycomb pore walls of adjacent carbon rods. Alternatively, both the first and second filter media are carbon rods, each with honeycomb pores extending along its own axis; the honeycomb pores of adjacent carbon rods have different diameters. Alternatively, the first filter media is carbon particles; the second filter media is a carbon rod with honeycomb pores extending along its own axis; at least one carbon rod is spaced between the first filter media and the output end of the second filter device; the carbon particles are cylindrical or prismatic carbon with a particle size greater than 2 mm.
[0009] The second filtration device further includes a spacer, which is disposed at the junction between the first filter medium and the second filter medium.
[0010] Preferably, the spacer is a sponge, non-woven fabric, or a rubber gasket.
[0011] The second filter device is disposed outside the first filter device, and the two are connected by a pipe. Alternatively, the second filter device is disposed inside the first filter device. Or, preferably, the air chamber is integrally formed with the inner wall of the first filter device.
[0012] After adopting the above technical solution, the present invention has the following technical effects:
[0013] This invention adds a second filter at the output of the first filter, with the second filter containing a first filter medium and a second filter medium having different gas paths. This causes the gas to deviate from the axis of the gas chamber during the emission process as it enters the second filter medium from the first filter medium, thereby extending the residence time of the gas inside the second filter and ultimately increasing the adsorption capacity for VOCs. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model.
[0015] Figure 2 This is a perspective view of the carbon rod according to the first embodiment of this utility model.
[0016] Figure 3 This is a schematic diagram of the structure of the second embodiment of the present utility model.
[0017] Figure 4 This is a structural schematic diagram of the third embodiment of the present utility model.
[0018] Explanation of icon numbers:
[0019] 1-First filter device; 11-Exhaust port; 12-Air inlet; 13-Clean port;
[0020] 2-Second filter device; 21-Air chamber; 22-First filter medium; 23-Second filter medium; 24-Spacer. Detailed Implementation
[0021] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.
[0022] refer to Figures 1 to 4 As shown, this utility model discloses a VOC gas purification structure, including a first filter device 1 and a second filter device 2.
[0023] The input end of the first filter device 1 is connected to the exhaust port of the fuel tank, especially the exhaust port of the fuel tank of vehicles such as automobiles.
[0024] The second filter device 2 is located at the output end of the first filter device 1. It includes a gas chamber 21 through which gas passes and a filter medium disposed in the gas chamber 21. The filter medium includes at least a first filter medium 22 and a second filter medium 23. When the gas passes through the junction between the first filter medium 22 and the second filter medium 23, the path changes due to deviation from the axis of the gas chamber 21.
[0025] Through the above solution, this utility model additionally sets a second filter device 2 at the output end of the first filter device 1, and the second filter device 2 has a first filter medium 22 and a second filter medium 23 with different gas paths. This causes the gas to deviate from the axis of the gas chamber 21 during the process of entering the second filter medium 23 from the first filter medium 22 during the emission process, thereby prolonging the residence time of the gas in the second filter device 2 and ultimately increasing the adsorption capacity of VOCs.
[0026] In some embodiments of this utility model, the first filter device 1 is an activated carbon canister and is provided with an exhaust port 11, an air inlet 12 and a cleaning port 13. The exhaust port 11 is one of the output ends of the first filter device 1, and the second filter device 2 is provided. The air inlet 12 is the input end of the first filter device 1, and the cleaning port 13 is the other output end of the first filter device 1, which is used to connect to a cleaning device.
[0027] refer to Figure 1 , 2 The first embodiment of the present invention is shown in the figure.
[0028] In the first embodiment, both the first filter medium 22 and the second filter medium 23 are carbon rods with honeycomb pores extending along their own axis. That is, at least two carbon rods are disposed within the gas chamber 21 of the second filter device 2. The installation angles of adjacent carbon rods are different, creating an angle (minimum positive angle 0~90°) between the honeycomb pore walls of the adjacent carbon rods. This prevents the gas from flowing directly in a straight line within the second filter device 2, requiring a change in its path when passing the junction between adjacent carbon rods. This prolongs the gas's residence time within the second filter device 2, ultimately increasing the adsorption capacity of the second filter device 2 for VOCs. Alternatively, another feasible technique is to set different pore sizes (e.g., 100 PPI and 200 PPI) for the honeycomb pores of adjacent carbon rods, resulting in different densities between the adjacent carbon rods, which also achieves the aforementioned effect.
[0029] In the first embodiment, the second filter device 2 further includes a spacer 24, which is disposed at the junction between the first filter medium 22 and the second filter medium 23.
[0030] Furthermore, the aforementioned spacer 24 can be a sponge, non-woven fabric, etc., to achieve shock absorption, or it can be a rubber gasket to achieve end face sealing between the first filter medium 22 and the second filter medium 23.
[0031] refer to Figure 3 As shown, a second embodiment of the present invention is illustrated.
[0032] In the second embodiment, the first filter medium 22 is carbon particles, preferably cylindrical or square-shaped carbon with a particle size greater than 2 mm; the second filter medium 23 is a carbon rod with honeycomb pores extending along its own axis, and at least one carbon rod is spaced between the first filter medium 22 and the output end of the second filter device 2. Thus, by filling with large carbon particles equivalent to carbon rods, the adsorption capacity of the second filter device 2 for VOCs can also be increased.
[0033] In addition, depending on the direction of gas flow, the arrangement of carbon particles and carbon rods can be carbon rod-carbon particles-carbon rod, carbon particles-carbon rod, etc., ensuring that there is at least one carbon rod between the first filter medium 22 and the output end of the second filter device 2.
[0034] refer to Figure 4 As shown, a third embodiment of the present invention is illustrated.
[0035] Most of the technical means in the third embodiment are the same as those in the first embodiment. The difference is that the second filter device 2 is located inside the first filter device 1 and the output ends of the two are at the same position, so that the gas filtered by the first filter device 1 first enters the input end of the second filter device 2, is filtered by the second filter device 2, and is then discharged from the output end of the second filter device 2 (which is also the output end of the first filter device 1).
[0036] The second filter device 2 in the relevant structures of the first to third embodiments can be designed independently on the outside of the activated carbon canister, integrally formed with the body of the activated carbon canister (i.e., forming a chamber inside), or installed inside the body of the activated carbon canister.
[0037] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.
Claims
1. A VOC gas purification structure, characterized in that: Includes a first filter device and a second filter device; The input end of the first filter device is connected to the exhaust port of the oil tank; The second filter device is disposed at the output end of the first filter device, and includes a gas chamber through which gas passes and a filter medium disposed in the gas chamber. The filter medium includes at least a first filter medium and a second filter medium. When the gas passes through the junction between the first filter medium and the second filter medium, a path change occurs that deviates from the axis of the gas chamber.
2. The VOC gas purification structure as described in claim 1, characterized in that: The first filtration device is an activated carbon canister, and is provided with an exhaust port, an air inlet, and a cleaning port; the exhaust port is one output end of the first filtration device, and a second filtration device is provided thereon; the air inlet is the input end of the first filtration device; the cleaning port is the other output end of the first filtration device, and is used to connect a cleaning device.
3. The VOC gas purification structure as described in claim 1 or 2, characterized in that: Both the first and second filter media are carbon rods, and the carbon rods are provided with honeycomb holes extending along their own axis; the installation angles of two adjacent carbon rods are different so that the walls of the honeycomb holes of the two adjacent carbon rods form an included angle.
4. The VOC gas purification structure as described in claim 1 or 2, characterized in that: Both the first and second filter media are carbon rods, and the carbon rods are provided with honeycomb pores extending along their own axis; the honeycomb pores of two adjacent carbon rods are set with different pore diameters.
5. The VOC gas purification structure as described in claim 1 or 2, characterized in that: The second filtration device further includes a spacer, which is disposed at the junction between the first filter medium and the second filter medium.
6. The VOC gas purification structure as described in claim 5, characterized in that: The spacer is made of sponge, non-woven fabric, or rubber gasket.
7. The VOC gas purification structure as described in claim 1 or 2, characterized in that: The first filter medium is carbon particles; the second filter medium is a carbon rod, which is provided with honeycomb pores extending along its own axis; there is at least one carbon rod between the first filter medium and the output end of the second filter device; the carbon particles are cylindrical or square carbon with a particle size greater than 2 mm.
8. The VOC gas purification structure as described in claim 1, characterized in that: The second filter device is located outside the first filter device, and the two are connected by a pipe.
9. The VOC gas purification structure as described in claim 1, characterized in that: The second filter is located inside the first filter.
10. The VOC gas purification structure as described in claim 9, characterized in that: The air cavity is integrally formed with the inner wall of the first filter device.