Automobile carbon tank

Abstract

The utility model discloses an automobile carbon canister, and belongs to the technical field of carbon canisters. The problem that in the prior art, when two cavities in a tank body of a carbon tank are cleaned, the cavity close to a desorption opening cannot be cleaned thoroughly is solved. The device mainly comprises a tank body, a partition plate is installed on the lower side in the tank body, a baffle is installed on the upper side of the partition plate in the tank body, the space on the upper side of the partition plate in the tank body is divided into a first activated carbon cavity and a second activated carbon cavity by the baffle, and the tank body is provided with an adsorption opening and a desorption opening in the top of the first activated carbon cavity. An atmosphere opening is formed in the top of the second activated carbon cavity of the tank body, a plurality of air holes are formed in the partition plate, each air hole comprises an upper opening, a middle section and a lower opening, the inner diameters of the upper openings and the lower openings are larger than the inner diameter of the middle sections, the upper openings are connected with the middle sections through upper conical surfaces, and the lower openings are connected with the middle sections through lower conical surfaces.

Description

Technical Field

[0001] This utility model belongs to the field of charcoal canister technology, and more specifically, relates to an automotive charcoal canister. Background Technology

[0002] The automotive charcoal canister is a core component of the fuel evaporative emission control system. It is mainly used to collect and store fuel vapors, preventing them from being directly emitted into the atmosphere, thereby reducing pollution and improving fuel efficiency.

[0003] Automotive charcoal canisters contain an activated carbon chamber filled with activated carbon. The canister typically also has an adsorption port, a desorption port, and an vent. During fuel vapor adsorption, fuel vapor from the tank enters the activated carbon chamber through the adsorption port. As the fuel vapor passes through the chamber, fuel molecules are adsorbed and stored by the activated carbon, while the remaining air is discharged through the vent and filter. During desorption, external air, driven by negative pressure from the engine, passes through the filter and enters the activated carbon chamber through the vent. As the air passes through the chamber, it washes away the adsorbed fuel molecules, creating a mixture. This mixture exits the canister through the desorption port and enters the intake manifold via a solenoid valve, ultimately mixing with fresh air before entering the engine for combustion. A baffle is typically installed at the bottom of the activated carbon chamber, with a pressure spring between the baffle and the bottom of the canister. The pressure spring compresses the activated carbon within the chamber.

[0004] During fuel vapor desorption in automotive charcoal canisters, airflow velocity has a significant impact on the desorption effect, as shown in the attached... Figure 5 As shown, this is a common structure of automotive charcoal canisters. During fuel adsorption, fuel vapor passes through the first chamber and then the second chamber. This often results in the activated carbon in the first chamber absorbing a larger amount of fuel molecules. When the activated carbon in the first and second chambers is desorbed by external air, the activated carbon in the first chamber is often not cleaned properly. That is, after desorption, a certain amount of fuel molecules are still adsorbed on the activated carbon in the first chamber, which causes some problems for the use of automotive charcoal canisters. Summary of the Invention

[0005] The purpose of this invention is to provide an automotive charcoal canister that overcomes the problem in the prior art where the chamber near the desorption port is not cleaned properly when cleaning the two chambers inside the canister.

[0006] This utility model is achieved using the following technical solution: an automotive activated carbon canister, comprising a canister body, a partition installed on the lower side of the canister body, and a baffle installed on the upper side of the partition inside the canister body. The baffle divides the space above the partition inside the canister body into a first activated carbon chamber and a second activated carbon chamber. The canister body has an adsorption port and a desorption port respectively opened at the top of the first activated carbon chamber, and an vent is opened at the top of the second activated carbon chamber. The partition has multiple vent holes, each vent hole including an upper opening, a middle section, and a lower opening. The inner diameters of the upper opening and the lower opening are both larger than the inner diameter of the middle section. The upper opening is connected to the middle section through an upper conical surface, and the lower opening is connected to the middle section through a lower conical surface.

[0007] Furthermore, the inner diameter of the upper opening is 4mm, the inner diameter of the middle section is 2mm, and the inner diameter of the lower opening is 4mm.

[0008] Furthermore, the length D1 of the upper opening is 2mm, the length D2 of the upper conical surface is 1mm, the length D3 of the middle section is 10mm, the length D4 of the lower opening is 2mm, and the length D5 of the lower conical surface is 1mm.

[0009] Furthermore, filter cotton is installed on the top of the partition, and filter cotton is installed on the top of the first activated carbon chamber and the top of the second activated carbon chamber inside the tank, respectively.

[0010] Furthermore, the top of the partition is provided with an installation groove, and filter cotton is installed in the installation groove.

[0011] Furthermore, both the first activated carbon cavity and the second activated carbon cavity are filled with activated carbon.

[0012] Furthermore, a spring is installed between the partition and the bottom of the tank.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention, by designing the vent holes as having an upper opening, a middle section, and a lower opening, effectively increases the airflow velocity entering the first activated carbon chamber during desorption, thereby resulting in a more thorough cleaning of the activated carbon. It also solves the problem in existing carbon canisters where the chamber near the desorption port is not thoroughly cleaned when cleaning the two chambers within the canister. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention;

[0016] Figure 2 This is a perspective view of the partition described in this utility model;

[0017] Figure 3 This is a cross-sectional view of the partition described in this utility model;

[0018] Figure 4 This is a schematic diagram of the air vent described in this utility model;

[0019] Figure 5 This is a schematic diagram of a car charcoal canister in the prior art.

[0020] In the diagram: 1. Tank body; 2. Baffle; 3. Deflector; 4. First activated carbon chamber; 5. Second activated carbon chamber; 6. Adsorption port; 7. Desorption port; 8. Atmospheric port; 9. Top opening; 10. Middle section; 11. Bottom opening; 12. Upper conical surface; 13. Lower conical surface; 14. Filter cotton; 15. Spring; 16. Mounting groove. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort should fall within the scope of protection of this utility model.

[0022] An automotive charcoal canister includes a canister body 1, a partition 2 installed on the lower side of the canister body 1, and a baffle 3 installed on the upper side of the partition 2 inside the canister body 1. The baffle 3 divides the space on the upper side of the partition 2 inside the canister body 1 into a first activated carbon chamber 4 and a second activated carbon chamber 5, both of which are filled with activated carbon.

[0023] A filter cotton 14 is installed on the top of the partition 2. Filter cotton 14 is also installed on the top of the first activated carbon chamber 4 and the top of the second activated carbon chamber 5 inside the tank 1. By setting the filter cotton 14, this invention can prevent activated carbon from passing through the filter cotton 14 and escaping from the first activated carbon chamber 4 and the second activated carbon chamber 5. The filter cotton 14 can be made of non-woven fabric.

[0024] The top of the partition 2 is provided with a mounting groove 16, and a filter cotton 14 is installed in the mounting groove 16. This utility model facilitates the installation of the filter cotton 14 by providing a mounting groove 16 at the top of the partition 2.

[0025] A spring 15 is installed between the partition 2 and the bottom of the tank 1. The spring 15 provides an upward elastic force to the partition 2, causing the partition 2 to press the activated carbon in the first activated carbon chamber 4 and the second activated carbon chamber 5. Under the elastic force of the spring 15, the filter cotton 14 at the top of the partition 2 can contact the bottom of the baffle 3.

[0026] The tank body 1 has an adsorption port 6 and a desorption port 7 at the top of the first activated carbon chamber 4, and an air vent 8 at the top of the second activated carbon chamber 5. The partition plate 2 has multiple vent holes. In the prior art, the vent holes on the partition plate 2 are basically cylindrical holes. This utility model changes the shape of the original vent holes and designs the vent holes into three sections: an upper opening 9, a middle section 10, and a lower opening 11. The inner diameters of the upper opening 9 and the lower opening 11 are both larger than the inner diameter of the middle section 10. The upper opening 9 is connected to the middle section 10 through the upper conical surface 12, and the lower opening 11 is connected to the middle section 10 through the lower conical surface 13.

[0027] This invention changes the shape of the vent holes on the partition 2 and increases the thickness of the partition 2, giving the partition 2 better resistance to deformation.

[0028] The inner diameter of the upper opening 9 is 4mm, the inner diameter of the middle section 10 is 2mm, and the inner diameter of the lower opening 11 is 4mm.

[0029] The length D1 of the upper opening 9 is 2mm, the length D2 of the upper conical surface 12 is 1mm, the length D3 of the middle section 10 is 10mm, the length D4 of the lower opening 11 is 2mm, and the length D5 of the lower conical surface 13 is 1mm.

[0030] During adsorption, fuel vapor first enters the first activated carbon chamber 4 through the adsorption port 6, then passes downward through the partition 2 and moves from the lower side of the partition 2 to the lower side of the second activated carbon chamber 5, and then passes upward through the partition 2 to enter the second activated carbon chamber 5. Throughout the fuel vapor adsorption process, the activated carbon in the first activated carbon chamber 4 adsorbs more fuel vapor than the activated carbon in the second activated carbon chamber 5. During desorption, under the negative pressure from the engine, external gas first enters the second activated carbon chamber 5 through the atmospheric port 8, then passes downward through the partition 2 and moves from the lower side of the partition 2 to the lower side of the first activated carbon chamber 4, and then passes upward through the partition 2 to enter the first activated carbon chamber 4. In the prior art, the gas entering the first activated carbon chamber 4 often has a low flow rate, resulting in incomplete cleaning of the activated carbon in the first activated carbon chamber 4. This causes the activated carbon in the first activated carbon chamber 4 to still adsorb a certain amount of fuel molecules, increasing the dead volume of the activated carbon.

[0031] In this invention, during desorption, when the gas passes upward through the partition 2 into the first activated carbon chamber 4, the gas first needs to enter the middle section 10 through the lower opening 11. Since the inner diameter of the lower opening 11 is 4mm and the inner diameter of the middle section 10 is 2mm, and the diameter gradually decreases through the lower conical surface 13, the gas flow rate will increase significantly. Moreover, the length D1 of the upper opening 9 is 2mm, which is relatively short, so the gas will enter the first activated carbon chamber 4 at a higher flow rate, thereby improving the desorption capacity of the gas on the activated carbon in the first activated carbon chamber 4, making the activated carbon in the first activated carbon chamber 4 cleaner, and reducing the dead volume of the activated carbon in the first activated carbon chamber 4.

Claims

1. A car charcoal canister, characterized in that, The container includes a tank (1), a partition (2) is installed on the lower side of the tank (1), and a baffle (3) is installed on the upper side of the partition (2) inside the tank (1). The baffle (3) divides the space on the upper side of the partition (2) inside the tank (1) into a first activated carbon chamber (4) and a second activated carbon chamber (5). The tank (1) has an adsorption port (6) and a desorption port (7) respectively opened at the top of the first activated carbon chamber (4). The tank (1) has an air vent (8) opened at the top of the second activated carbon chamber (5). The partition (2) has multiple vent holes. The vent holes include an upper opening (9), a middle section (10) and a lower opening (11). The inner diameters of the upper opening (9) and the lower opening (11) are both larger than the inner diameter of the middle section (10). The upper opening (9) is connected to the middle section (10) through an upper conical surface (12), and the lower opening (11) is connected to the middle section (10) through a lower conical surface (13).

2. The automotive charcoal canister according to claim 1, characterized in that, The inner diameter of the upper opening (9) is 4 mm, the inner diameter of the middle section (10) is 2 mm, and the inner diameter of the lower opening (11) is 4 mm.

3. The automotive charcoal canister according to claim 2, characterized in that, The length D1 of the upper opening (9) is 2mm, the length D2 of the upper conical surface (12) is 1mm, the length D3 of the middle section (10) is 10mm, the length D4 of the lower opening (11) is 2mm, and the length D5 of the lower conical surface (13) is 1mm.

4. The automotive charcoal canister according to claim 1, characterized in that, The top of the partition (2) is fitted with filter cotton (14), and filter cotton (14) is fitted in the top of the first activated carbon chamber (4) and the top of the second activated carbon chamber (5) in the tank (1).

5. The automotive charcoal canister according to claim 4, characterized in that, The top of the partition (2) is provided with an installation groove (16), and a filter cotton (14) is installed in the installation groove (16).

6. The automotive charcoal canister according to claim 1, characterized in that, Both the first activated carbon chamber (4) and the second activated carbon chamber (5) are filled with activated carbon.

7. The automotive charcoal canister according to claim 1, characterized in that, A spring (15) is installed between the partition (2) and the bottom of the tank (1).

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