An oil and gas separation device that prevents dynamic leakage

Abstract

The utility model discloses an oil gas separation device of preventing dynamic leakage, including mutually cooperate's upper casing and lower casing, upper casing lid is combined in lower casing, and forms a sealed cavity, lower casing is provided with air inlet and gas outlet, and lower casing inside fills the oil absorption filler, and lower casing inboard still is equipped with the positioning structure for fixed oil absorption filler, and upper casing inboard is equipped with the baffle for blocking liquid oil, and baffle lower side and oil absorption filler top surface resist pressure contact. Use this oil gas separation device, through setting up oil absorption filler in lower casing inside, combine the baffle structure of upper casing, and liquid oil falls into oil absorption filler after the impact and is adsorbed locking, will not be brought into carbon canister because of car body shaking, avoids carbon canister failure and emission overproof from the root.

Description

Technical Field

[0001] This utility model relates to the field of automotive fuel system technology, specifically to an oil-gas separation device for preventing dynamic leakage. Background Technology

[0002] During refueling and operation, a large amount of fuel vapor is generated in the fuel tank and condenses on the exhaust pipe. At the same time, during vehicle operation, bumps, tilting, and rollovers can cause liquid fuel to splash out from the exhaust valves. If this liquid fuel enters the charcoal canister, it will cause the carbon powder to deteriorate, and in severe cases, it will lead to leakage. Therefore, it is necessary to install an oil-gas separator in the exhaust section.

[0003] The existing utility model patent "A built-in oil-gas separation combination valve for fuel tanks", authorized announcement number CN210370970 U, proposes an improvement scheme: the refueling control valve and the tipping valve are installed separately at the bottom of the oil-gas separation box. The oil-gas separation box includes a box body, a cover plate, multiple guide plates and an exhaust pipe. The valves are installed independently so that the two do not interfere with each other. At the same time, the guide plates guide the flow of oil and gas, so that the gas is discharged through the exhaust pipe and the oil flows back through the refueling control valve, which optimizes the dynamic leakage function of the combination valve to a certain extent.

[0004] However, this technical solution still has significant shortcomings: its oil-gas separation relies solely on the physical guiding effect of the deflector, failing to effectively "lock in" the separated liquid oil. When the vehicle experiences bumps, tilting, or rapid acceleration / deceleration during operation, the liquid oil temporarily stored in the oil-gas separator is easily carried by the airflow due to vehicle movement, entering the subsequent exhaust passage along the exhaust pipe and ultimately flowing into the charcoal canister. Once the liquid oil enters the charcoal canister, it causes the charcoal canister's carbon adsorption capacity to fail, significantly reducing the charcoal canister's performance in handling fuel vapor.

[0005] Therefore, it is necessary to provide an oil-gas separation device that prevents dynamic leakage to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing an oil-gas separation device that can effectively lock liquid oil, prevent dynamic leakage, and ensure smooth oil-gas flow.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] An oil-gas separation device for preventing dynamic leakage is characterized by comprising an upper shell and a lower shell that cooperate with each other, the upper shell covering the lower shell to form a sealed cavity, the lower shell having an air inlet and an air outlet, the interior of the lower shell being filled with an oil-absorbing filler, the inner side of the lower shell also having a positioning structure for fixing the oil-absorbing filler, and the inner side of the upper shell having a baffle for blocking liquid oil, the lower edge of the baffle being in pressure contact with the top surface of the oil-absorbing filler.

[0009] Preferably, the air inlet includes a first air inlet, a second air inlet and a third air inlet. The second air inlet also serves as an oil return port and is located at the lowest position of the lower housing. The bottom of the lower housing is also provided with an air outlet guide pipe. One end of the air outlet guide pipe is connected to the air outlet, and the other end is bent upward to form an air outlet port.

[0010] Preferably, the positioning structure includes multiple positioning posts and several arc-shaped positioning plates. The arc-shaped positioning plates are evenly spaced along the edge of the second air inlet. The oil-absorbing filler is tightly surrounding the outside of the arc-shaped positioning plates and is interference-fitted with the arc-shaped positioning plates. The positioning post array is distributed on the bottom surface inside the lower housing, penetrating and fixing the oil-absorbing filler.

[0011] Preferably, the bottom surface of the lower housing is provided with a first latching seat corresponding to the first air inlet and a second latching seat corresponding to the second air inlet. The first latching seat is equipped with a working exhaust valve, and the outlet of the working exhaust valve is sealed and connected to the first air inlet. The second latching seat is equipped with a liquid level control valve, and the outlet of the liquid level control valve is sealed and connected to the second air inlet. A charcoal canister connector is installed on the outside of the air outlet, and an air inlet pipe connector is installed on the outside of the third air inlet. A partition is fixedly provided on the inside, and the partition and the inner wall of the lower housing form an air intake channel for unidirectional flow of oil and gas.

[0012] Preferably, the top of the first air inlet, the top of the air outlet, the top of the air inlet channel, the top of the positioning post, and the top of the arc-shaped positioning plate are all higher than the top surface of the oil-absorbing filler.

[0013] Preferably, the lower shell, the air outlet guide pipe, and the positioning structure are integrally injection molded, and the upper shell and the baffle are integrally injection molded.

[0014] Preferably, non-woven fabric is fixed to both the oil return port and the air outlet port to prevent the release of precipitates and fine fibers.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] 1. Completely solve the dynamic leakage problem: By setting up an oil-absorbing filler inside the lower housing, combined with the baffle structure of the upper housing, the liquid oil slides into the oil-absorbing filler after impact and is absorbed and locked, preventing it from being carried into the charcoal canister due to vehicle shaking, thus avoiding charcoal canister failure and excessive emissions at the source.

[0017] 2. Liquid oil can be recycled: The liquid oil adsorbed by the oil-absorbing filler can be recycled back to the fuel tank through the oil return port located at the lowest position of the lower shell under gravity or negative pressure conditions, so as to realize fuel recycling and reuse and improve fuel utilization.

[0018] 3. Reliable structure and controllable cost: The lower shell, exhaust guide pipe and positioning structure are integrally injection molded, and the upper shell and baffle are integrally injection molded, making assembly convenient; the assembly scheme of snap-fit ​​seat reduces the use of quick-connect couplings and reduces production costs; at the same time, the non-woven fabric design prevents precipitates and fine fibers from falling into the oil tank or carbon canister, improving the safety of the device operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the filling of the oil-absorbing filler inside the lower housing.

[0020] Figure 2 This is a schematic diagram of the internal structure of the lower shell;

[0021] Figure 3 This is a schematic diagram of the upper shell structure;

[0022] Figure 4 This is a schematic diagram of the structure of the oil-absorbing filler;

[0023] Figure 5 This is a schematic diagram of the external structure of an oil-gas separation device;

[0024] Among them, 1-upper shell, 2-lower shell, 3-first air inlet, 4-second air inlet, 5-first latch seat, 6-second latch seat, 7-air outlet guide pipe, 8-charcoal canister connector, 9-air inlet pipe connector, 10-partition plate, 11-oil absorbent filler, 12-positioning post, 13-arc-shaped positioning plate, 14-baffle plate Detailed Implementation

[0025] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and not for limiting the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixed connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this utility model, terms such as "upper", "lower", "bottom", and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various components or elements of this utility model and do not specifically refer to any component or element in this utility model. They should not be construed as limiting this utility model.

[0028] like Figures 1 to 5 As shown, an oil-gas separation device for preventing dynamic leakage includes an upper shell 1 and a lower shell 2 that cooperate with each other. The upper shell covers the lower shell and forms a sealed cavity. The shell is preferably made of PA or POM material. The two are sealed together by vibration friction welding or laser welding to ensure the cavity is airtight.

[0029] The lower housing has a first air inlet 3, a second air inlet 4, a third air inlet and an air outlet. The second air inlet also serves as an oil return port and is located at the lowest point of the lower housing to facilitate the return of liquid oil.

[0030] The bottom surface of the lower housing is provided with a first latching seat 5 corresponding to the first air inlet and a second latching seat 6 corresponding to the second air inlet. The first latching seat is equipped with a working exhaust valve, the outlet of which is sealed and connected to the first air inlet; the second latching seat is equipped with a liquid level control valve, the outlet of which is sealed and connected to the second air inlet.

[0031] The bottom of the lower shell is also provided with an exhaust guide pipe 7. One end of the exhaust guide pipe is connected to the exhaust port, and the other end is bent upward to form an exhaust port, which guides the gaseous oil flow to the charcoal canister. A charcoal canister connector 8 is installed on the outside of the exhaust port for connecting the charcoal canister. An intake pipe connector 9 is installed on the outside of the third intake port, and a baffle 10 is fixed on the inside. The baffle and the inner wall of the lower shell form an intake channel for unidirectional flow of oil and gas, preventing oil and gas backflow.

[0032] The lower shell is filled with an oil-absorbing filler 11. The oil-absorbing filler is made of high-molecular porous fiber materials such as PP and PES or inorganic oleophilic materials such as carbon powder. The adsorption capacity is not less than 30 ml, which can fully adsorb liquid oil.

[0033] The lower housing has a positioning structure inside, including multiple positioning posts 12 and several arc-shaped positioning plates 13. The arc-shaped positioning plates are evenly spaced along the edge of the second air inlet. The oil-absorbing filler is tightly surrounded on the outside of the arc-shaped positioning plate and forms an interference fit. The positioning post array is distributed on the bottom surface inside the lower housing, penetrating and fixing the oil-absorbing filler to prevent it from shifting when the vehicle body shakes.

[0034] The inner side of the upper housing is provided with a baffle 14 for blocking liquid oil. The lower edge of the baffle is in contact with the top surface of the oil-absorbing filler, which can block the liquid oil carried in the airflow and make it slide into the oil-absorbing filler.

[0035] The lower housing, air outlet guide pipe, and positioning structure are integrally injection molded, while the upper housing and baffle are integrally injection molded.

[0036] Non-woven fabric is fixed to both the oil return port and the air outlet port, and is fixed by ultrasonic welding to prevent the release of oil-absorbing filler material and the scattering of fine fibers, thus avoiding contamination of the charcoal canister or fuel tank.

[0037] The top of the first air inlet, the top of the air outlet, the top of the air inlet channel, the top of the positioning column, and the top of the arc-shaped positioning plate are all higher than the top surface of the oil-absorbing filler, ensuring that gaseous oil and gas can pass through smoothly and are not blocked by the oil-absorbing filler.

[0038] The principle of an oil-gas separation device to prevent dynamic leakage:

[0039] During car refueling: Fuel vapor mixed with a small amount of liquid oil enters the sealed cavity through the first air inlet (via the working exhaust valve), the second air inlet (via the liquid level control valve), and the third air inlet (via the intake pipe). The liquid oil in the airflow is blocked by the baffle on the upper shell, slides down the baffle into the oil-absorbing filler, and is adsorbed and locked; the gaseous oil vapor passes through the space above the oil-absorbing filler, enters the charcoal canister through the exhaust guide pipe and the exhaust port, thus achieving oil-gas separation.

[0040] During vehicle operation: Bumps in the vehicle body cause liquid oil in the fuel tank to splash. If it enters the cavity through the air intake, it will be blocked by the baffle and fall into the oil-absorbing filler, preventing it from entering the charcoal canister with the airflow.

[0041] Liquid oil return process: The liquid oil adsorbed by the oil-absorbing filler gradually converges to the oil return port (second air inlet) at the lowest position of the lower shell under the action of gravity or the negative pressure of the fuel tank, and finally flows back to the fuel tank to achieve recycling.

[0042] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. An oil-gas separation device for preventing dynamic leakage, characterized in that: It includes an upper shell and a lower shell that cooperate with each other. The upper shell covers the lower shell and forms a sealed cavity. The lower shell has an air inlet and an air outlet. The lower shell is filled with an oil-absorbing filler. The inner side of the lower shell is also provided with a positioning structure for fixing the oil-absorbing filler. The inner side of the upper shell is provided with a baffle for blocking liquid oil. The lower edge of the baffle is in contact with the top surface of the oil-absorbing filler.

2. The oil-gas separation device for preventing dynamic leakage according to claim 1, characterized in that: The air inlet includes a first air inlet, a second air inlet and a third air inlet. The second air inlet also serves as an oil return port and is located at the lowest position of the lower housing. The bottom of the lower housing is also provided with an air outlet guide pipe. One end of the air outlet guide pipe is connected to the air outlet, and the other end is bent upward to form an air outlet port.

3. The oil-gas separation device for preventing dynamic leakage according to claim 2, characterized in that: The positioning structure includes multiple positioning posts and several arc-shaped positioning plates. The arc-shaped positioning plates are evenly spaced along the edge of the second air inlet. The oil-absorbing filler is tightly surrounding the outside of the arc-shaped positioning plates and is interference-fitted with the arc-shaped positioning plates. The positioning post array is distributed on the bottom surface inside the lower housing, penetrating and fixing the oil-absorbing filler.

4. The oil-gas separation device for preventing dynamic leakage according to claim 3, characterized in that: The bottom surface of the lower housing is provided with a first latching seat corresponding to the first air inlet and a second latching seat corresponding to the second air inlet. The first latching seat is equipped with a working exhaust valve, and the outlet of the working exhaust valve is sealed and connected to the first air inlet. The second latching seat is equipped with a liquid level control valve, and the outlet of the liquid level control valve is sealed and connected to the second air inlet. A charcoal canister connector is installed on the outside of the air outlet, and an air inlet pipe connector is installed on the outside of the third air inlet. A partition is fixedly installed on the inside, and the partition and the inner wall of the lower housing form an air intake channel for unidirectional flow of oil and gas.

5. The oil-gas separation device for preventing dynamic leakage according to claim 4, characterized in that: The top of the first air inlet, the top of the air outlet, the top of the air inlet channel, the top of the positioning post, and the top of the arc-shaped positioning plate are all higher than the top surface of the oil-absorbing filler.

6. The oil-gas separation device for preventing dynamic leakage according to claim 2, characterized in that: The lower shell, air outlet guide pipe, and positioning structure are integrally injection molded, while the upper shell and baffle are integrally injection molded.

7. The oil-gas separation device for preventing dynamic leakage according to claim 2, characterized in that: Non-woven fabric is fixed to both the oil return port and the air outlet port to prevent the release of precipitates and fine fibers.

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