A carbon can for gasoline engines

Abstract

A carbon canister for a gasoline engine includes a canister body, a cover, an adsorption channel, a desorption channel, an atmospheric channel, an adsorbent, and a partition. The canister body and the cover form a closed cavity. The adsorbent is disposed within the cavity. The partition is disposed within the cavity and extends from the canister body to the cover. The adsorption channel and the desorption channel are located in a first region of the canister body, and the atmospheric channel is located in a second region. The first and second regions are located on the same end face of the canister body. The partition is disposed between the first and second regions, dividing the cavity into a first cavity and a second cavity. The width of the first cavity is greater than the width of the second cavity. The first cavity communicates with the adsorption channel and the desorption channel, and the second cavity communicates with the atmospheric channel. The distance between the partition and the cover is greater than the width of the second cavity. Under normal conditions, the adsorbent in the first cavity preferentially adsorbs gasoline vapor. During desorption, the first cavity is closer to the desorption channel, resulting in lower flow resistance and improved adsorption and desorption efficiency.

Description

Technical Field

[0001] This application relates to the field of gasoline engine parts, and more particularly to a carbon canister for gasoline engines. Background Technology

[0002] Gasoline engines use gasoline as fuel. Gasoline is more volatile than diesel, so a carbon canister is typically installed to reduce the pressure increase caused by gasoline evaporation and potential fuel leakage. The carbon canister is filled with activated carbon, which has strong adsorption properties and can adsorb a certain amount of gasoline vapor, reducing the pressure in the fuel tank. The adsorption capacity of the carbon canister is related to the amount of activated carbon and its spatial structure. Since the space for installing the carbon canister is limited, the amount of activated carbon can also be limited; therefore, the spatial structure of the carbon canister is crucial. Existing carbon canisters are mainly divided into inline and partitioned types. Inline types are usually longer and require more space, while partitioned types are shorter and can have connecting pipes on one side, making installation more convenient. However, the partitioned structure causes airflow to change direction, resulting in greater flow resistance and increased adsorption and desorption resistance, which affects adsorption and desorption efficiency during use.

[0003] Chinese patent application CN210049973, entitled "Activated Carbon Canister for Automobiles," discloses an activated carbon canister for automobiles, belonging to the technical field of automotive fuel vapor treatment devices. It solves the technical problem of poor adaptability of existing activated carbon canisters for automobiles. This activated carbon canister for automobiles includes a shell and a top cover disposed on the shell. A cavity for the passage of fuel vapor is provided between the shell and the top cover. Several partitions are provided within the cavity, dividing it into several chambers. The partitions are movably disposed within the cavity. This invention improves the adaptability of the activated carbon canister to different vehicle models; however, the partitions increase the resistance to adsorption and desorption, affecting the efficiency of adsorption and desorption. Utility Model Content

[0004] This application provides a carbon canister for a gasoline engine to at least solve the adsorption and desorption efficiency problems existing in the prior art.

[0005] According to this application, a carbon canister for a gasoline engine is provided, including a canister body, a cover, an adsorption channel, a desorption channel, an atmospheric channel, an adsorbent, and a partition. The canister body and the cover form a closed cavity. The adsorbent is disposed within the cavity. The partition is disposed within the cavity and extends from the canister body to the cover. The adsorption channel and the desorption channel are disposed in a first region of the canister body, and the atmospheric channel is disposed in a second region. The first region and the second region are disposed on the same end face of the canister body. The partition is disposed between the first region and the second region, dividing the cavity into a first cavity and a second cavity. The width of the first cavity is greater than the width of the second cavity. The first cavity communicates with the adsorption channel and the desorption channel, and the second cavity communicates with the atmospheric channel. The distance between the partition and the cover is greater than the width of the second cavity.

[0006] Compared with the prior art, the carbon canister for gasoline engines of this application has the following advantages: Under normal conditions, the adsorbent in the first cavity preferentially adsorbs gasoline vapor. During desorption, the first cavity is close to the desorption channel, resulting in low flow resistance. When the amount of gasoline vapor is large, it can enter the second cavity from the first cavity, allowing the adsorbent in the second cavity to begin adsorbing the gasoline vapor. An atmospheric channel is located in the second cavity. When the pressure in the second cavity decreases, air can be transported through the atmospheric channel to further increase the evaporation rate of gasoline vapor. Increasing the distance between the baffle and the cover can reduce flow resistance. Under the guiding effect of the baffle, the airflow distribution in the cavity is also more uniform, allowing gasoline to evaporate stably in all areas and improving adsorption and desorption efficiency.

[0007] In one embodiment, the adsorption channel includes a first adsorption channel and a second adsorption channel. The first adsorption channel is connected to the carburetor, and the second adsorption channel is connected to the fuel tank. In this way, not only can the gasoline evaporated in the fuel tank enter the carbon canister and be adsorbed by the adsorbent, but the gasoline remaining in the carburetor when the engine is stopped can also evaporate and enter the carbon canister to be adsorbed, which can further save fuel and reduce environmental pollution caused by gasoline emissions.

[0008] In one embodiment, the desorption channel is connected to the air filter, and the first adsorption channel is connected to the end of the carburetor near the engine. The desorption channel mainly provides fuel to the engine. It is located on the side of the air filter so that it can mix better with the air. The temperature is higher at the end near the engine, and the gasoline is more likely to evaporate. The evaporated gasoline enters the carbon canister through the second adsorption channel, reducing the emission of residual gasoline from the carburetor.

[0009] In one embodiment, the first adsorption channel is located at the center of the first region, and the second adsorption channel and the desorption channel are respectively located on both sides of the first adsorption channel. During adsorption, it is difficult to form a uniform airflow in the tank. Adsorption is carried out first near the outlet of the first adsorption channel, and then gradually diffuses to the adjacent areas from near to far until all the adsorbent is saturated. During desorption, a stable airflow enters from the atmospheric channel, which can accelerate gasoline evaporation and enter the engine for combustion through the desorption channel.

[0010] In one embodiment, the first adsorption channel is connected to the guide pipe, which extends from the tank to the center of the first cavity. The length of the guide pipe is less than the length of the partition, so that adsorption can start from the position near the center of the first cavity and spread outwards, resulting in high adsorption and desorption efficiency.

[0011] In one embodiment, the first region of the tank protrudes outward to form a first buffer chamber, the guide pipe separates from the first buffer chamber to form a second buffer chamber, and the second region of the tank protrudes outward to form a third buffer chamber. Under the action of the buffer chamber, the concentration of gasoline is more uniform, and the adsorption and desorption are more stable, whether it is adsorption or desorption.

[0012] In one embodiment, the first buffer chamber is provided with multiple first flow guiding supports and a first filter plate. The first flow guiding supports extend from the first region toward the center of the cavity to support the first filter plate. The second buffer chamber is provided with multiple second flow guiding supports and a second filter plate. The second flow guiding supports extend from the first region toward the center of the cavity to support the second filter plate. The third buffer chamber is provided with multiple third flow guiding supports and a third filter plate. The third flow guiding supports extend from the second region toward the center of the cavity to support the third filter plate. The first, second, and third filter plates can block the adsorbent and prevent the adsorbent from entering the first, second, and third buffer chambers. The adsorbent is usually particulate matter, which can cause blockage and interfere with engine operation if it enters the pipeline. Therefore, it needs to be confined within the tank.

[0013] In one embodiment, an elastic element, a support element, and a filter element are provided on the side of the cavity near the cover. One end of the elastic element abuts against the cover, and the other end abuts against the support element. The support element provides support for the filter element and exerts a certain pressure on the filter element under the action of the elastic element. The elastic element ensures that the adsorbent is tightly arranged in the cavity of the tank, making adsorption and desorption more stable.

[0014] In one embodiment, a thickened ring is provided at one end of the tank body near the cover, and a gap groove is provided on the connecting end face of the thickened ring and the cover, or a gap groove is provided on the connecting end face of the cover and the thickened ring. The inner side of the gap groove is the welding area, and the outer side of the gap groove is the connection area. In this way, the welding area is covered by the connection area, making the welding more aesthetically pleasing, eliminating the need for grinding, and improving production efficiency.

[0015] In one embodiment, a mounting bracket is provided on the outside of the tank body. The mounting bracket is provided with a mounting plate, a left wing plate and a right wing plate. The mounting plate is provided with mounting holes. The left wing plate and the right wing plate open to both sides to form a figure-eight shape, and the upper ends of the left wing plate and the upper ends of the right wing plate are inclined to both sides respectively. This makes installation convenient. The position can be fixed first by using the left wing plate and the right wing plate and then locked with screws.

[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0018] Figure 1 A three-dimensional schematic diagram of the composition and structure of the carbon canister for a gasoline engine according to Embodiment 1 of this application is shown; Figure 2 This paper shows a front view schematic diagram of the composition structure of a carbon canister for a gasoline engine according to Embodiment 1 of this application; Figure 3 This paper shows a side view schematic diagram of the composition structure of a carbon canister for a gasoline engine according to Embodiment 1 of this application; Figure 4 It shows Figure 3 A cross-sectional view along the AA direction; Figure 5 The diagram shown is a bottom view of the structural composition of a carbon canister for a gasoline engine according to Embodiment 1 of this application. Figure 6 It shows Figure 5 Cross-sectional view along the BB direction; Figure 7 An explosion diagram of a carbon canister for a gasoline engine according to Embodiment 1 of this application is shown; Figure 8 A schematic diagram of the canister body for a gasoline engine in Embodiment 1 of this application is shown; Figure 9 This paper shows a top view of the carbon canister for a gasoline engine according to Embodiment 1 of this application; Figure 10 A cross-sectional schematic diagram of a carbon canister for a gasoline engine according to Embodiment 2 of this application is shown.

[0019] Explanation of the labels in the diagram: X, first direction; Y, second direction; Z, third direction; 1. Tank body; 2. Cover; 3. Adsorption channel; 4. Desorption channel; 5. Atmospheric channel; 6. Baffle; 7. Cavity; 8. Adsorbent; 9. Guide pipe; 10. Mounting bracket; 11. First region; 12. Second region; 13. First buffer chamber; 14. Second buffer chamber; 15. Third buffer chamber; 16. Fourth buffer chamber; 17. First guide support; 18. First filter plate; 19. Second guide support; 20. Second filter plate; 21. Third guide support; 21. Flow support component; 22. Third filter plate; 23. Elastic component; 24. Support component; 25. Filter component; 26. Cross fixing bracket; 27. Round tube protrusion; 28. Mounting plate; 29. ​​Left wing plate; 30. Right wing plate; 31. Mounting hole; 32. Nut; 33. U-shaped clamping plate; 34. Thickened ring; 35. Spacing groove; 36. Welding area; 37. Connection area; 38. Second adsorption channel; 39. First adsorption channel; 71. First cavity; 72. Second cavity. Detailed Implementation

[0020] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Example 1: like Figure 1 and Figure 4As shown, a carbon canister for a gasoline engine includes a canister body 1, a cover 2, an adsorption channel 3, a desorption channel 4, an atmospheric channel 5, an adsorbent 8, and a partition 6. The canister body 1 and the cover form a closed cavity 7. The adsorbent 8 is disposed within the cavity 7. The partition 6 is disposed within the cavity 7 and extends from the canister body 1 to the cover 2. The adsorption channel 3 and the desorption channel 4 are disposed in a first region 11 of the canister body 1, and the atmospheric channel 5 is disposed in a second region 12. The first region 11 and the second region 12 are located on the same end face of the canister body 1. The partition 6 is disposed between the first region 11 and the second region 12, dividing the cavity 7 into a first cavity 71 and a second cavity 72. The width of the first cavity 71 is greater than the width of the second cavity 72. The first cavity 71 communicates with the adsorption channel 3 and the desorption channel 4, and the second cavity 72 communicates with the atmospheric channel 5. The distance between the partition 6 and the cover 2 is greater than the width of the second cavity 72, resulting in a larger communication area between the first cavity 71 and the second cavity 72. The cover 2 is located in the first direction of the tank body 1. The adsorption channel 3, the desorption channel 4, and the atmospheric channel 5 extend from the tank body 1 in the opposite direction to the first direction. The first region 11 and the second region 12 are arranged in the third direction. The width of the first cavity 71 and the second cavity 72 are in the third direction. The baffle 6 extends towards the cover 2 in the first direction. The length of the baffle 6 in the first direction is about one-third of the length of the tank body 1 in the first direction. It is usually set within the range of 0.2-0.5 of the length of the tank body 1 to ensure low-resistance airflow.

[0022] like Figure 1 and Figure 2 As shown, in one embodiment, the tank 1 can adopt a square shell design, which can reduce the interference range during installation. The tank 1 and the cover 2 are made of the same material. The tank 1, adsorption channel 3, desorption channel 4, atmospheric channel 5, and baffle 6 can be integrally die-cast from aluminum alloy or integrally molded by injection molding, and then fixed to the cover 2 by welding to form an integral structure. The adsorption channel 3, desorption channel 4, and atmospheric channel 5 all adopt a circular tube structure, and arc-shaped protrusions are provided at the connection positions to facilitate the use of clamps to fasten the connecting pipes.

[0023] like Figure 1 and Figure 2 As shown, in one possible embodiment, the adsorption channel 3 includes a first adsorption channel 39 and a second adsorption channel 38. The first adsorption channel 39 is connected to the carburetor, and the second adsorption channel 38 is connected to the fuel tank. The desorption channel 4 is connected to the air filter, which improves the performance.

[0024] like Figure 3 and Figure 5As shown, in one embodiment, the first adsorption channel 39 is disposed at the center of the first region 11, and the second adsorption channel 38 and the desorption channel 4 are respectively disposed on both sides of the first adsorption channel 39. To make the second adsorption channel 38 and the desorption channel 4 farther apart, the second adsorption channel 38 and the desorption channel 4 can be disposed diagonally on the first region 11.

[0025] like Figure 4 and Figure 6 As shown, in one possible embodiment, the first adsorption channel 39 is connected to the guide pipe 9, which extends from the tank 1 toward the center of the first cavity 71 in the first direction. The length of the guide pipe 9 extending in the first direction is half the length of the partition 6.

[0026] like Figure 1 , Figure 6 and Figure 7 As shown, in one embodiment, the first region 11 of the tank body 1 protrudes outward to form a first buffer cavity 13, the guide pipe 9 is separated from the first buffer cavity 14 to form a second buffer cavity 14, the second region 12 of the tank body 1 protrudes outward to form a third buffer cavity 15, and the connection position of the second adsorption channel 38 is separated from the first buffer cavity 13 to form a fourth buffer cavity 16.

[0027] like Figure 4 , Figure 7 and Figure 9 As shown, in one possible embodiment, the first buffer cavity 13 is provided with a plurality of first flow guide supports 17 and a first filter plate 18. The first flow guide supports 17 extend from the first region 11 toward the center of the cavity 7 to support the first filter plate 18. The second buffer cavity 14 is provided with a plurality of second flow guide supports 19 and a second filter plate 20. The second flow guide supports 19 extend from the first region 11 toward the center of the cavity 7 to support the second filter plate 20. The third buffer cavity 15 is provided with a plurality of third flow guide supports 21 and a third filter plate 22. The third flow guide supports 21 extend from the second region 12 toward the center of the cavity 7 to support the third filter plate 22. The first flow guide supports 17 and the third flow guide supports 21 can be configured in a flat shape.

[0028] like Figure 4 , Figure 6 and Figure 7As shown, in one embodiment, the cavity 7 of the tank 1 near the cover 2 is provided with an elastic element 23, a support element 24, and a filter element 25. One end of the elastic element 23 abuts against the cover 2, and the other end abuts against the support element 24. The support element 24 supports the filter element 25 and exerts a certain pressure on the filter element 25 under the action of the elastic element 23. The elastic element 23 is a spring. The support element 24 is provided with a cross-shaped fixing bracket 26 to facilitate the fixing of the spring. The cover 2 is provided with a round tube protrusion 27 to fix the spring. The filter element 25 is provided with micropores to block the adsorbent 8, but gasoline vapor can penetrate the filter element 25.

[0029] like Figure 2 , Figure 3 , Figure 7 and Figure 8 As shown, in one embodiment, a mounting bracket 10 is provided on the outer side of the tank body 1. The mounting bracket 10 is provided with a mounting plate 28, a left wing plate 29, and a right wing plate 30. The mounting plate 28 is provided with mounting holes 31, and the mounting holes 31 are provided with nuts 32. The nuts 32 are provided with U-shaped clamping plates 33 and are fixed to the mounting plate 28 by means of the U-shaped clamping plates 33. Figure 2 As shown, the left wing plate 29 and the right wing plate 30 open to both sides to form a figure-eight shape, as... Figure 5 As shown, the left wing plate 29 and the right wing plate 30 open to both sides to form a figure-eight shape. That is, the left wing plate 29 and the right wing plate 30 not only rotate at a certain angle along a rotation axis parallel to the first direction to form the figure-eight shape in the top view, but also rotate at a certain angle around a rotation axis parallel to the second direction, causing the upper ends of the left wing plate 29 and the right wing plate 30 in the front view to tilt to both sides respectively. For ease of installation, as... Figure 3 As shown, the outer contour projection line of the mounting bracket 10 is parallel to the outer surface of the tank 1.

[0030] like Figure 1 and Figure 4 As shown, in one embodiment, a thickened ring 34 is provided at one end of the tank body 1 near the cover body 2. The thickened ring 34 protrudes outward relative to the tank body 1. A gap groove 35 is provided on the connecting end face of the thickened ring 34 and the cover body 2. The connecting end face of the cover body 2 and the thickened ring 34 is provided with a gap groove 35. The inner side of the gap groove 35 is a welding area 36, ​​and the outer side of the gap groove 35 is a connection area 37.

[0031] Example 2: like Figure 10 As shown, the difference from Embodiment 1 is that the thickened ring 34 is located inside the tank body 1, and the connection end face between the thickened ring 34 and the cover 2 is provided with a spacer groove 35, which is also located inside the tank body 1. The connection end face between the cover 2 and the thickened ring 34 is provided with a spacer groove 35. The inner side of the spacer groove 35 is the welding area 36, ​​and the outer side of the spacer groove 35 is the connection area 37. The opening of the tank body 1 is relatively small, requiring the use of a side core-pulling mold for forming. This design makes the tank body more aesthetically pleasing, allows for a smoother exterior, and facilitates cleaning.

[0032] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this application can be achieved, and this is not limited herein.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] It should be understood that if the directional terms such as "upper," "lower," "front," "rear," "left," and "right" are used to describe the embodiments of this application from the angle shown in a certain drawing, they should not be construed as limiting the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that a component is connected to another component "upper" or "lower," it can be directly connected to the other component "upper" or "lower," or it can be indirectly connected to the other component "upper" or "lower" through an intermediate component.

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A carbon canister for a gasoline engine, comprising a canister body (1), a cover (2), an adsorption channel (3), a desorption channel (4), an atmospheric channel (5), an adsorbent (8), and a partition (6), wherein the canister body (1) and the cover form a closed cavity (7), the adsorbent (8) is disposed within the cavity (7), and the partition (6) is disposed within the cavity (7) and extends from the canister body (1) to the cover (2), characterized in that: The adsorption channel (3) and the desorption channel (4) are disposed in the first region (11) of the tank body (1), and the atmospheric channel (5) is disposed in the second region (12). The first region (11) and the second region (12) are disposed on the same end face of the tank body (1). The partition (6) is disposed between the first region (11) and the second region (12). The partition (6) divides the cavity (7) into a first cavity (71) and a second cavity (72). The width of the first cavity (71) is greater than the width of the second cavity (72). The first cavity (71) is connected to the adsorption channel (3) and the desorption channel (4). The second cavity (72) is connected to the atmospheric channel (5). The distance between the partition (6) and the cover (2) is greater than the width of the second cavity (72).

2. The carbon canister for a gasoline engine according to claim 1, characterized in that: The adsorption channel (3) includes a first adsorption channel (39) and a second adsorption channel (38). The first adsorption channel (39) is connected to the carburetor, and the second adsorption channel (38) is connected to the fuel tank.

3. The carbon canister for a gasoline engine according to claim 2, characterized in that: The desorption channel (4) is connected to the air filter device, and the first adsorption channel (39) is connected to the end of the carburetor near the engine.

4. The carbon canister for a gasoline engine according to claim 3, characterized in that: The first adsorption channel (39) is located at the center of the first region (11), and the second adsorption channel (38) and the desorption channel (4) are respectively located on both sides of the first adsorption channel (39).

5. The carbon canister for a gasoline engine according to claim 4, characterized in that: The first adsorption channel (39) is connected to the guide pipe (9), which extends from the tank (1) to the center of the first cavity (71). The length of the guide pipe (9) is less than the length of the partition (6).

6. The carbon canister for a gasoline engine according to claim 5, characterized in that: The first region (11) of the tank (1) protrudes outward to form a first buffer cavity (13), the guide pipe (9) separates from the first buffer cavity (13) to form a second buffer cavity (14), and the second region (12) of the tank (1) protrudes outward to form a third buffer cavity (15).

7. The carbon canister for a gasoline engine according to claim 6, characterized in that: The first buffer cavity (13) is provided with a plurality of first flow guide supports (17) and a first filter plate (18). The first flow guide supports (17) extend from the first region (11) toward the center of the cavity (7) to support the first filter plate (18). The second buffer cavity (14) is provided with a plurality of second flow guide supports (19) and a second filter plate (20). The second flow guide supports (19) extend from the first region (11) toward the center of the cavity (7) to support the second filter plate (20). The third buffer cavity (15) is provided with a plurality of third flow guide supports (21) and a third filter plate (22). The third flow guide supports (21) extend from the second region (12) toward the center of the cavity (7) to support the third filter plate (22).

8. The carbon canister for a gasoline engine according to any one of claims 1-7, characterized in that: The cavity (7) is provided with an elastic element (23), a support element (24) and a filter element (25) on the side near the cover (2). One end of the elastic element (23) abuts against the cover (2) and the other end abuts against the support element (24). The support element (24) supports the filter element (25) and exerts a certain pressure on the filter element (25) under the action of the elastic element (23).

9. The carbon canister for a gasoline engine according to claim 8, characterized in that: A thickened ring (34) is provided at one end of the tank body (1) near the cover body (2). A gap groove (35) is provided on the connecting end face of the thickened ring (34) and the cover body (2), or a gap groove (35) is provided on the connecting end face of the cover body (2) and the thickened ring (34). The inner side of the gap groove (35) is the welding area (36), and the outer side of the gap groove (35) is the connection area (37).

10. The carbon canister for a gasoline engine according to claim 9, characterized in that: The tank body (1) is provided with a mounting bracket (10) on the outside. The mounting bracket (10) is provided with a mounting plate (28), a left wing plate (29) and a right wing plate (30). The mounting plate (28) is provided with mounting holes (31). The left wing plate (29) and the right wing plate (30) open to both sides to form a figure-eight shape, and the upper ends of the left wing plate (29) and the upper ends of the right wing plate (30) are respectively inclined to both sides.

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