A fuel vapor vent control valve

Abstract

The utility model relates to the technical field of automobile fuel system, specifically is a kind of fuel vapor emission control valve. Including valve body, the top wall or side wall of valve body is equipped with inflow, when the side wall of valve body is equipped with inflow, inflow outside is equipped with retaining wall, and retaining wall and the side wall between valve body form accommodating space. Compared with prior art, the fuel vapor emission control valve in traditional fuel tank is improved, the critical height of liquid level trigger is changed, the closing height of valve is effectively reduced, the flatness characteristics of hybrid vehicle fuel tank are aimed at, the valve closing logic is optimized, the mismatch problem of traditional FLVV on hybrid vehicle is solved, and function upgrade is realized by local structure adjustment.

Description

Technical Field

[0001] This utility model relates to the field of automotive fuel system technology, specifically a fuel vapor emission control valve. Background Technology

[0002] With the rapid development of the automotive industry, hybrid vehicles have gradually expanded their market share due to their high efficiency and energy saving advantages. The fuel tank structure design of hybrid vehicles is different from that of traditional fuel vehicles. In order to adapt to the complex layout of the vehicle interior and optimize space utilization, the fuel tank of hybrid vehicles is becoming more and more inclined to a flat design.

[0003] like Figure 11 As shown, the closing height of the filler valve (FLVV) on a traditional car fuel tank is typically around 23mm. However, the flattened shape of the fuel tank in a hybrid vehicle alters the internal fuel storage space distribution, resulting in a significantly different fuel level rise during refueling compared to a traditional tank. Due to the flattened tank, the same volume of fuel will rise higher within the tank. If the 23mm closing height FLVV is continued, fuel may prematurely reach the valve opening during refueling, causing refueling to be interrupted prematurely and preventing the tank from filling completely. This significantly impacts the user experience and the vehicle's range.

[0004] Currently, there is a lack of FLVVs specifically designed for the characteristics of hybrid vehicle fuel tanks on the market. Existing refueling limit valves cannot meet the special requirements of refueling height for hybrid vehicles, which to some extent limits the use of hybrid vehicles. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this utility model provides a fuel vapor emission control valve, offering a solution to the problem of hybrid vehicles being unable to fill up with fuel due to an unreasonable closing height of the fuel limit valve during refueling. This improves the refueling convenience and range of hybrid vehicles, and enhances the user experience.

[0006] To achieve the above objectives, a fuel vapor emission control valve is designed, including a valve body. The valve body has an inlet on its top wall or side wall. When the valve body has an inlet on its side wall, a baffle is provided outside the inlet, and a receiving space is formed between the baffle and the side wall of the valve body.

[0007] The retaining wall and valve body are an integral structure.

[0008] The retaining wall is a semi-enclosed or fully enclosed structure.

[0009] The aforementioned retaining wall can block the inlet.

[0010] The lower end of the baffle wall is located at the lower end of the inlet, and the upper end of the baffle wall is located above the inlet or the top wall of the valve body.

[0011] The lower part of the valve body is spliced ​​together with the chassis. A guide is fitted on the top of the chassis. A float assembly is installed inside the guide. The float assembly is slidably connected to the guide. A spring structure is fitted at the bottom of the float assembly. A seal is installed at the top of the float assembly. One end of the exhaust pipe is located at the upper end of the seal. The other end of the exhaust pipe passes through the valve body and is located on one side of the valve body.

[0012] The chassis is a bushing structure, with an outlet at the bottom and a guide groove for fixing the guide component surrounding the outlet.

[0013] The chassis has a fixing groove on its bottom periphery that mates with the valve body.

[0014] The guide member has vertically arranged oil grooves at its bottom.

[0015] The seal is provided with a claw-shaped connector below it, which allows the seal to lock onto the top of the float assembly. The top of the seal is provided with a sealing cap.

[0016] Compared with the prior art, this utility model improves the fuel vapor emission control valve in the traditional fuel tank by changing the critical height of liquid level triggering, effectively reducing the valve closing height. In view of the flat characteristics of the fuel tank of hybrid vehicles, the valve closing logic is optimized to solve the mismatch problem of traditional FLVV in hybrid models. Functional upgrade is achieved through local structural adjustment. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model.

[0018] Figure 2 This is a top view of Embodiment 1 of the present utility model.

[0019] Figure 3 This is a cross-sectional view of Embodiment 1 of the present utility model. Figure 1 .

[0020] Figure 4 A cross-sectional view of Embodiment 1 of this utility model Figure 2 .

[0021] Figure 5 This is a schematic diagram of the chassis structure of Embodiment 1 of this utility model.

[0022] Figure 6 This is a schematic diagram of the guide component structure in Embodiment 1 of this utility model.

[0023] Figure 7 This is a schematic diagram of the sealing element in Embodiment 1 of this utility model.

[0024] Figure 8 This is a schematic diagram of the valve in the closed state in Embodiment 1 of this utility model.

[0025] Figure 9 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0026] Figure 10 This is a structural schematic diagram of Embodiment 3 of the present invention.

[0027] Figure 11 This is a schematic diagram showing the current valve in the closed state.

[0028] See Figures 1 to 11 1 is the valve body, 1-1 is the top wall, 1-2 is the side wall, 2 is the float assembly, 3 is the spring structure, 4 is the exhaust pipe, 5 is the seal, 5.1 is the claw-shaped connector, 5.2 is the sealing cover, 6 is the inlet, 7 is the external baffle, 8 is the guide, 8.1 is the oil passage groove, 9 is the chassis, 9.1 is the outlet, 9.2 is the guide groove, 9.3 is the fixing groove, and 10 is the receiving space. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings. Example 1

[0030] In this embodiment, the fuel vapor emission control valve is as follows: Figures 1 to 7 As shown, a flow inlet 6 is provided on the side wall 1-2 of the valve body 1, and a baffle 7 is provided outside the flow inlet 6. A receiving space 10 is formed between the baffle 7 and the side wall 1-2 of the valve body 1. The flow inlet 6 allows external fuel to enter the valve body 1, and the baffle 7 shortens the effective path for the fuel level to rise by physically limiting it, thus reducing the valve closing height. In this embodiment, the retaining wall 7 is a semi-enclosed bowl-shaped structure.

[0031] The retaining wall 7 and the valve body 1 are an integral structure. In this embodiment, injection molding is used as the integral molding method.

[0032] The retaining wall 7 can block the inlet 6. For example... Figure 1 As shown, the lower end of the baffle 7 is located below the inlet 6, and the upper end of the baffle 7 is located above the inlet 6 or the top wall 1-1 of the valve body 1. In actual use, the number of inlets 6 is not limited, and each inlet is provided with a baffle 7 on its outer side to block the inlet 6. In this embodiment, there are two inlets 6 and two baffles 7.

[0033] The lower part of the valve body 1 is spliced ​​together with the chassis 9. The valve body 1 serves as the main structure of the fuel vapor emission control valve, providing an internal cavity and external interface, fixing other components, and forming a fuel vapor emission path. A guide member 8 is fitted on top of the chassis 9. A float assembly 2 is installed inside the guide member 8. The float assembly 2 is slidably connected to the guide member 8. A spring structure 3 is fitted at the bottom of the float assembly 2, and a seal 5 is installed at the top of the float assembly 2. One end of the exhaust pipe 4 is located at the upper end of the seal 5, and the other end of the exhaust pipe 4 passes through the valve body 1 and is located on one side of the valve body 1. The chassis 9 serves as the connecting part between the valve body 1 and the fuel tank, fixing the guide member 8 and controlling the fuel flow direction. The guide member 8 guides the vertical movement of the float assembly 2 to ensure the accuracy of valve opening and closing. The float assembly 2 senses changes in fuel level through buoyancy, driving the seal 5 to close the exhaust pipe 4. The spring structure 3 provides a restoring force to ensure that the float assembly 2 returns to its initial position after the fuel level drops.

[0034] like Figure 5 As shown, the chassis 9 has a bushing structure. The bottom of the chassis 9 is provided with an outlet 9.1 for fuel discharge. The outer side of the outlet 9.1 is surrounded by a guide groove 9.2 for fixing the guide member 8. The guide groove 9.2 surrounds the outlet 9.1 and is used to fix the guide member 8 and limit its horizontal displacement. The bottom periphery of the chassis 9 is provided with a fixing groove 9.3 that cooperates with the valve body 1. The fixing groove 9.3 is located on the periphery of the chassis 9 and is spliced ​​with the valve body 1 to ensure overall sealing.

[0035] like Figure 6 As shown, the bottom of the guide member 8 is provided with vertically arranged oil grooves 8.1.

[0036] like Figure 7 As shown, the seal 5 has a claw-shaped connector 5.1 at the bottom. The claw-shaped connector 5.1 can make the seal 5 lock the top of the float assembly 2. The top of the seal 5 has a sealing cover 5.2. When the liquid level reaches the critical height, the seal 5 closes the exhaust pipe 4 to block the emission of fuel vapor. The claw-shaped connector 5.1 locks the top of the float assembly 2 to ensure that the seal 5 moves synchronously with the float assembly 2.

[0037] The specific implementation process of this embodiment is as follows: Technicians align and splice the lower part of the valve body 1 with the chassis 9 through the fixing groove 9.3 to ensure sealing. The guide groove 9.2 of the chassis 9 is fitted with the bottom of the guide member 8 to fix the position of the guide member 8. The guide member 8 is then fitted onto the chassis 9, ensuring it is vertically aligned with the oil groove 8.1 facing the fuel flow direction. The float assembly 2 is inserted into the guide member 8, allowing it to slide vertically along the guide member 8. A spring structure 3 is fitted onto the bottom of the float assembly 2, with one end of the spring fixed to the inner wall of the guide member 8. The claw-shaped connector 5 of the sealing member 5 is then... 1. Secure the float assembly 2 to the top, ensuring the sealing cap 5.2 is aligned with the exhaust pipe 4. Insert the exhaust pipe 4 into the top of the valve body 1, with its end contacting the sealing cap 5.2. Outside the window 6 on the side wall of the valve body 1, an integrally molded bowl-shaped external baffle 7 is formed using injection molding. The baffle can cover the inlet 6, forming a detour path for the fuel level. Connect the assembled valve body 1 to the fuel tank, and connect the exhaust pipe 4 to the carbon canister. The valve can then begin operation. Due to the detour design of the baffle 7, the fuel level only needs to rise by 15mm to trigger valve closure, making it suitable for various flat fuel tanks. Example 2

[0038] This embodiment only describes the differences from Embodiment 1; the similarities will not be repeated.

[0039] The difference between this embodiment and Embodiment 1 is that, Figure 9 As shown, in this embodiment, the baffle 7 is a fully enclosed cylindrical structure that completely surrounds the entire area. In practical use, the number of inlets 6 is not limited, and the fully enclosed baffle 7 can block all inlets 6. In this embodiment, there are two inlets 6 and one baffle 7.

[0040] In practical use of this embodiment, since the valve is located inside the oil tank, the added oil must first submerge the baffle 7 before flowing into the valve body 1, causing the float assembly 2 to rise and thus close the valve. Through the fully enclosed structure of this embodiment, a smaller closing height can be achieved than in Embodiment 1, meeting the customer's requirement to add more oil with a fixed oil tank size. Example 3

[0041] This embodiment only describes the differences from Embodiment 1; the similarities will not be repeated.

[0042] The difference between this embodiment and Embodiment 1 is that, Figure 10 As shown, an inlet 6 is provided on the top wall 1-1 of the valve body 1. In this embodiment, the oil inlet 6 is located at the top of the valve body 1. In actual use, the oil needs to submerge the valve body and enter through the top inlet 6, thus reducing the closing height. No baffle 7 is provided in this embodiment.

Claims

1. A fuel vapor emission control valve, comprising a valve body, characterized in that: The valve body (1) has an inlet (6) on its top wall (1-1) or side wall (1-2). When the valve body (1) has an inlet (6) on its side wall (1-2), a baffle (7) is provided outside the inlet (6), and a receiving space (10) is formed between the baffle (7) and the side wall (1-2) of the valve body (1).

2. The fuel vapor emission control valve according to claim 1, characterized in that: The retaining wall (7) and the valve body (1) are an integral structure.

3. A fuel vapor emission control valve according to claim 1 or 2, characterized in that: The retaining wall (7) is a semi-enclosed structure or a fully enclosed structure.

4. A fuel vapor emission control valve according to claim 3, characterized in that: The aforementioned retaining wall (7) can block the inlet (6).

5. A fuel vapor emission control valve according to claim 3, characterized in that: The lower end of the baffle (7) is located at the lower end of the inlet (6), and the upper end of the baffle (7) is located above the top wall (1-1) of the inlet (6) or valve body (1).

6. A fuel vapor emission control valve according to claim 4, characterized in that: The lower end of the baffle (7) is located at the lower end of the inlet (6), and the upper end of the baffle (7) is located above the top wall (1-1) of the inlet (6) or valve body (1).

7. A fuel vapor emission control valve according to claim 1, characterized in that: The lower part of the valve body (1) is spliced ​​together with the chassis (9). A guide (8) is sleeved on the top of the chassis (9). A float assembly (2) is provided inside the guide (8). The float assembly (2) is slidably connected to the guide (8). A spring structure (3) is sleeved at the bottom of the float assembly (2). A sealing element (5) is provided at the top of the float assembly (2). One end of the exhaust pipe (4) is provided at the upper end of the sealing element (5). The other end of the exhaust pipe (4) passes through the valve body (1) and is located on one side of the valve body (1).

8. A fuel vapor emission control valve according to claim 7, characterized in that: The chassis (9) is a bushing structure. The bottom of the chassis (9) is provided with an outlet (9.1). The outer side of the outlet (9.1) is surrounded by a guide groove (9.2) for fixing the guide (8).

9. A fuel vapor emission control valve according to claim 7 or 8, characterized in that: The bottom periphery of the chassis (9) is provided with a fixing groove (9.3) that cooperates with the valve body (1).

10. A fuel vapor emission control valve according to claim 7, characterized in that: The guide member (8) has vertically arranged oil grooves (8.1) at its bottom.

11. A fuel vapor emission control valve according to claim 7, characterized in that: The seal (5) is provided with a claw-shaped connector (5.1) below it. The seal (5) is secured to the top of the float assembly (2) by the claw-shaped connector (5.1). The top of the seal (5) is provided with a sealing cap (5.2).

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