VOC gas purification mechanism

Abstract

This utility model discloses a VOC gas purification mechanism to control the fuel evaporation emissions of a vehicle when it is not in use. The VOC gas purification mechanism includes a first filter device, a two-way valve, and a one-way valve; the first filter device is provided with at least an exhaust port and an intake port; an exhaust pipe is led out from the exhaust port, and the end of the exhaust pipe is connected to the two-way valve; a circulation pipe is led out between the two ends of the exhaust pipe, and the end of the circulation pipe is connected to the intake port; a one-way valve is provided between the two ends of the circulation pipe, and the one-way valve only allows gas to flow from the exhaust pipe through the circulation pipe to the intake port.

Description

Technical Field

[0001] This utility model belongs to the field of exhaust emission control technology, and specifically refers to a VOC gas purification mechanism. 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 finer filtration devices at the emission point to filter fuel vapor emissions. However, due to limitations in gas flow, daytime emission standards still cannot be met. Utility Model Content

[0004] The main objective of this invention is to provide a VOC gas purification mechanism to solve the problems existing in the prior art and to control the amount of fuel evaporation emissions from automobiles when they are not in use.

[0005] To achieve the above objectives, one of the solutions of this utility model is:

[0006] A VOC gas purification mechanism includes a first filter device, a two-way valve, and a one-way valve; the first filter device is provided with at least an exhaust port and an intake port; an exhaust pipe is led out from the exhaust port, and the end of the exhaust pipe is connected to the two-way valve; a circulation pipe is led out between the two ends of the exhaust pipe, and the end of the circulation pipe is connected to the intake port; a one-way valve is provided between the two ends of the circulation pipe, and the one-way valve only allows gas to flow from the exhaust pipe through the circulation pipe to the intake port.

[0007] The flow direction during gas emission is defined as forward flow. The forward flow opening pressure of the two-way valve is set to P1, the reverse flow opening pressure is set to P2, and the opening pressure of the one-way valve is set to P3. The relationship between the three is P1 > P3 > P2.

[0008] The first filtration device is an activated carbon canister.

[0009] The air intake port of the first filter device is also connected to the fuel tank of the vehicle; the first filter device is also provided with a cleaning port.

[0010] The second solution of this utility model is:

[0011] A VOC gas purification mechanism includes a first filter device, a second filter device, a two-way valve, and a one-way valve. The first filter device has at least one exhaust port. An exhaust pipe extends from the exhaust port, and the end of the exhaust pipe is connected to the two-way valve. The second filter device is disposed between the two ends of the exhaust pipe. A circulation pipe extends from the output end of the second filter device to the two-way valve, and the end of the circulation pipe is connected to the exhaust port and the input end of the second filter device. A one-way valve is disposed between the two ends of the circulation pipe, and the one-way valve only allows gas to flow from the output end of the second filter device through the circulation pipe to the area between the exhaust port and the input end of the second filter device.

[0012] The flow direction during gas emission is defined as forward flow. The forward flow opening pressure of the two-way valve is set to P1, the reverse flow opening pressure is set to P2, and the opening pressure of the one-way valve is set to P3. The relationship between the three is P1 > P3 > P2.

[0013] The first filtration device is an activated carbon canister.

[0014] The first filter device is also provided with at least one of an air inlet and a cleaning inlet.

[0015] The second filter device includes a housing and at least two carbon rods arranged end-to-end within the housing. Each carbon rod has a plurality of honeycomb pores extending along its own axis. The installation angles of two adjacent carbon rods are different so that the honeycomb pore walls of the two adjacent carbon rods form an included angle, and / or the honeycomb pore diameters of the two adjacent carbon rods are different.

[0016] After adopting the above technical solution, the present invention has the following technical effects:

[0017] This invention incorporates a two-way valve, a circulation pipeline, and a one-way valve on the exhaust pipe leading out from the first filter device. By setting appropriate opening pressures for the two-way and one-way valves, the flow direction of the gas can be controlled. The two-way valve will only open and the gas will be discharged into the atmosphere when the internal pressure reaches a certain value, thereby meeting the new exhaust emission standards. At the same time, by setting a one-way valve, the gas can be prevented from being discharged directly into the atmosphere without filtration. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model.

[0020] Figure 3 This is a perspective view of the carbon rod according to the third embodiment of this utility model.

[0021] Explanation of icon numbers:

[0022] 1-First filter device; 11-Exhaust port; 12-Intake port; 13-Cleaning port; 2-Two-way valve; 3-One-way valve; 4-Second filter device; 41-Outer shell; 42-Carbon rod; 421-Honeycomb pores; a-Exhaust pipe; b-Circulation pipe. Detailed Implementation

[0023] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0024] refer to Figure 1 The first embodiment of the present invention is shown, namely a VOC gas purification mechanism, including a first filter device 1, a two-way valve 2 and a one-way valve 3.

[0025] The first filter device 1 is provided with at least an exhaust port 11 and an air inlet port 12;

[0026] An exhaust pipe a is led out from the exhaust port 11, and the end of the exhaust pipe a is connected to the two-way valve 2;

[0027] A circulation pipe b is led out between the two ends of the exhaust pipe a, and the end of the circulation pipe b is connected to the intake port 12.

[0028] A one-way valve 3 is installed between the two ends of the circulation pipe b. The one-way valve 3 only allows gas to flow from the exhaust pipe a through the circulation pipe b to the intake port 12, that is, it restricts gas from flowing directly from the intake port 12 to the exhaust pipe a.

[0029] Through the above scheme, the first embodiment sets a two-way valve 2, a circulation pipe b, and a one-way valve 3 on the exhaust pipe a leading out of the first filter device 1. By setting appropriate opening pressures for the two-way valve 2 and the one-way valve 3, the flow direction of the gas can be controlled. The two-way valve 2 will only open and the gas will be discharged into the atmosphere when the internal pressure reaches a certain value, thereby meeting the new exhaust emission standards. At the same time, by setting the one-way valve 3, the gas can be prevented from being discharged directly into the atmosphere without being filtered by the first filter device 1.

[0030] The following shows a detailed scheme of the first embodiment.

[0031] The flow direction during gas discharge is defined as forward flow. The forward flow opening pressure of the bidirectional valve 2 is set to P1, the reverse flow opening pressure is set to P2, and the opening pressure of the one-way valve 3 is set to P3. The relationship between the three is P1 > P3 > P2. (Reference) Figure 1 As shown, during the loading process: when the internal pressure reaches P1, the two-way valve 2 opens, and fuel vapor is discharged into the atmosphere; when the internal pressure is between P1 and P3, the one-way valve 3 opens, allowing the circulation pipe b to be opened, and the fuel vapor will circulate internally without being discharged into the atmosphere. During the desorption process, when the external pressure (i.e., the input pressure) reaches P2, the two-way valve 2 opens, and external gas is input into the interior. Since P2 < P3, the one-way valve 3 will not open, and the external gas flows into the first filter device 1 through the exhaust pipe a. Combined with the cleaning interface 13 described below, the cleaning function of the VOC gas purification mechanism can be realized.

[0032] The first filtration device 1 mentioned above is an activated carbon canister.

[0033] The air intake interface 12 of the first filter device 1 is also connected to the fuel tank of the car. That is, the exhaust port of the fuel tank and the circulation pipe b are both connected to the air intake interface 12, so that they can be shared. There is no need to improve the housing and interface of the first filter device 1, and the existing device can be used.

[0034] The first filter device 1 described above is also provided with a cleaning interface 13, which is used to connect a cleaning device.

[0035] refer to Figure 2 , 3 As shown, a second embodiment of the present invention is illustrated, namely a VOC gas purification mechanism, including a first filter device 1, a second filter device 4, a two-way valve 2, and a one-way valve 3.

[0036] The first filter device 1 is provided with at least an exhaust port 11;

[0037] An exhaust pipe a is led out from the exhaust port 11, and the end of the exhaust pipe a is connected to the two-way valve 2;

[0038] A second filter device 4 is installed between the two ends of the exhaust pipe a. A circulation pipe b is led out from the output end of the second filter device 4 and the two-way valve 2. The end of the circulation pipe b is connected to the exhaust port 11 and the input end of the second filter device 4.

[0039] A one-way valve 3 is installed between the two ends of the circulation pipe b. The one-way valve 3 only allows gas to flow from the output end of the second filter device 4 through the circulation pipe b to the area between the exhaust port 11 and the input end of the second filter device 4, that is, it restricts the gas from flowing directly from the exhaust port 11 to the direction of the two-way valve 2.

[0040] Through the above scheme, the second embodiment sets a second filter 4, a two-way valve 2, a circulation pipe b, and a one-way valve 3 on the exhaust pipe a leading out of the first filter device 1. By setting appropriate opening pressures for the two-way valve 2 and the one-way valve 3, the flow direction of the gas can be controlled. The two-way valve 2 will only open and the gas will be discharged into the atmosphere when the internal pressure reaches a certain value, thereby meeting the new fuel vapor emission standards. At the same time, adding the second filter 4 can further filter the gas, and by setting the one-way valve 3, the gas can be prevented from being discharged directly into the atmosphere without being filtered by the first filter device 1 and the second filter device 4.

[0041] The following shows a detailed scheme of the second embodiment.

[0042] The flow direction during gas discharge is defined as forward flow. The forward flow opening pressure of the bidirectional valve 2 is set to P1, the reverse flow opening pressure is set to P2, and the opening pressure of the one-way valve 3 is set to P3. The relationship between the three is P1 > P3 > P2. (Reference) Figure 1 As shown, during the loading process: when the internal pressure reaches P1, the two-way valve 2 opens, and fuel vapor is discharged into the atmosphere; when the internal pressure is between P1 and P3, the one-way valve 3 opens, allowing the circulation pipe b to be opened, and the fuel vapor will circulate internally without being discharged into the atmosphere. During the desorption process, when the external pressure (i.e., the input pressure) reaches P2, the two-way valve 2 opens, and external gas is input into the interior. Since P2 < P3, the one-way valve 3 will not open, and the external gas flows into the first filter device 1 through the exhaust pipe a. Combined with the cleaning interface 13 described below, the cleaning function of the VOC gas purification mechanism can be realized.

[0043] The first filtration device 1 mentioned above is an activated carbon canister.

[0044] The first filter device 1 is also provided with an air intake interface 12, which is used to connect to the fuel tank of the car.

[0045] The first filter device 1 described above is also provided with a cleaning interface 13, which is used to connect a cleaning device.

[0046] The aforementioned second filter device 4 includes a housing 41 and at least two adjacent carbon rods 42 disposed within the housing 41. Each carbon rod 42 has a plurality of honeycomb pores 421 extending along its own axis. The installation angles of adjacent carbon rods 42 are different, resulting in an included angle (minimum positive angle 0~90°) between the honeycomb pore walls of adjacent carbon rods 42, and / or the pore diameters of adjacent carbon rods 42 are different. As a result, the gas cannot flow directly in a straight line within the second filter device 4 and needs to change its movement path when passing through the junction of two adjacent carbon rods 42, thereby prolonging its residence time within the second filter device 4 and ultimately increasing its VOC adsorption capacity.

[0047] 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 mechanism, characterized in that: Includes a first filter, a two-way valve, and a one-way valve; The first filter device is provided with at least an exhaust port and an air inlet port; An exhaust pipe leads out from the exhaust port, and the end of the exhaust pipe is connected to the two-way valve; A circulation pipe is led out between the two ends of the exhaust pipe, and the end of the circulation pipe is connected to the intake port. A one-way valve is provided between the two ends of the circulation pipeline. The one-way valve only allows gas to flow from the exhaust pipeline through the circulation pipeline to the intake port.

2. The VOC gas purification mechanism as described in claim 1, characterized in that: The flow direction during gas emission is defined as forward flow. The forward flow opening pressure of the two-way valve is set to P1, the reverse flow opening pressure is set to P2, and the opening pressure of the one-way valve is set to P3. The relationship between the three is P1 > P3 > P2.

3. The VOC gas purification mechanism as described in claim 1, characterized in that: The first filtration device is an activated carbon canister.

4. The VOC gas purification mechanism as described in claim 1, characterized in that: The air intake port of the first filter device is also connected to the fuel tank of the vehicle; the first filter device is also provided with a cleaning port.

5. A VOC gas purification mechanism, characterized in that: Includes a first filter device, a second filter device, a two-way valve, and a one-way valve; The first filter device is provided with at least an exhaust port; An exhaust pipe leads out from the exhaust port, and the end of the exhaust pipe is connected to the two-way valve; The second filter device is provided between the two ends of the exhaust pipe. A circulation pipe is led out from the output end of the second filter device and the two-way valve. The end of the circulation pipe is connected to the exhaust port and the input end of the second filter device. A one-way valve is provided between the two ends of the circulation pipeline. The one-way valve only allows gas to flow from the output end of the second filter device through the circulation pipeline to the area between the exhaust port and the input end of the second filter device.

6. The VOC gas purification mechanism as described in claim 5, characterized in that: The flow direction during gas emission is defined as forward flow. The forward flow opening pressure of the two-way valve is set to P1, the reverse flow opening pressure is set to P2, and the opening pressure of the one-way valve is set to P3. The relationship between the three is P1 > P3 > P2.

7. The VOC gas purification mechanism as described in claim 5, characterized in that: The first filtration device is an activated carbon canister.

8. The VOC gas purification mechanism as described in claim 5, characterized in that: The first filter device is also provided with at least one of an air inlet and a cleaning inlet.

9. The VOC gas purification mechanism as described in claim 5, characterized in that: The second filter device includes a housing and at least two carbon rods arranged end-to-end within the housing. Each carbon rod has a plurality of honeycomb pores extending along its own axis. The installation angles of two adjacent carbon rods are different so that the honeycomb pore walls of the two adjacent carbon rods form an included angle.

10. The VOC gas purification mechanism as described in claim 5, characterized in that: The second filter device includes a housing and at least two carbon rods arranged end-to-end within the housing. Each carbon rod has a number of honeycomb pores extending along its own axis. The honeycomb pores of adjacent carbon rods have different diameters.

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