An electric oil and gas shut-off valve and its refueling system

Abstract

The application relates to the technical field of oil and gas detection, in particular to an electric oil and gas cut-off valve and an oil filling system thereof, which comprises an oil and gas passage, an on-off control component and a motor driving component. The oil and gas passage comprises an air inlet end and an air outlet end, the air inlet end is used for being communicated with a circulating pipe oil tank side, and the air outlet end is communicated with a circulating pipe oil filling pipe side. The on-off control component has a state one and a state two. When the on-off control component is in the state one, the oil and gas passage is in a disconnected state. When the on-off control component is in the state two, the oil and gas passage is in a connected state. The motor driving component output shaft is connected with the on-off control component and drives the on-off control component to switch between the state one and the state two through rotation. The application effectively controls the on-off of the circulating pipe, reduces oil and gas diffusion in the oil filling process, and meets the effect of meeting environmental protection emission requirements.

Description

Technical Field

[0001] This application relates to the field of oil and gas detection technology, and in particular to an electric oil and gas shut-off valve and its refueling system. Background Technology

[0002] A vehicle's fuel system typically includes a fuel tank, a filler hose, and the piping assemblies connecting the two. To effectively monitor the fuel system's sealing integrity, modern vehicles are usually equipped with on-board diagnostic systems. In this system, the recirculation pipe connecting the fuel tank and the filler hose plays a crucial auxiliary detection role. When the fuel level in the tank rises and submerges the lower end of the filler hose, the detection device typically uses the airflow path provided by this recirculation pipe to detect any fuel vapor leaks. In existing refueling system technology, the recirculation pipe connecting the filler hose and the fuel tank is usually designed as a normally open structure. That is, without additional control devices, this recirculation pipe remains open, allowing direct communication between the fuel tank's interior and the filler hose opening. This design is simple, ensures basic connectivity, and allows free flow of gas within the fuel tank under normal conditions; it is currently a common piping connection method. However, during vehicle refueling, as fuel is rapidly injected into the tank, the fuel vapors are compressed and flow back along the normally open recirculation pipe to the filler hose head. This portion of oil and gas can easily escape directly into the atmosphere through the refueling nozzle, which will lead to an increase in oil and gas emissions during the refueling process, making it difficult to meet increasingly stringent environmental emission standards. Utility Model Content

[0003] The purpose of this application is to provide an electric oil and gas shut-off valve and a refueling system, which can effectively control the opening and closing of the circulation pipe, reduce oil and gas leakage during the refueling process, and meet environmental emission requirements.

[0004] Firstly, the electric oil / gas shut-off valve provided in this application adopts the following technical solution: An electric oil / gas shut-off valve, characterized in that it comprises: The oil and gas passage includes an inlet end and an outlet end. The inlet end is used to connect with the oil tank side of the circulation pipe, and the outlet end is connected with the refueling pipe side of the circulation pipe. The on / off control component has two states: state one and state two. When the on / off control component is in state one, the oil and gas passage is in the off state. When the on / off control component is in state two, the oil and gas passage is in the connected state. A motor drive component, the output shaft of which is connected to the on / off control component and drives the on / off control component to switch between state one and state two by rotation.

[0005] Optionally, the oil and gas passage is provided with a through hole, and the air inlet end is connected to the air outlet end through the through hole; The on / off control component includes a lead screw and a lead screw flange screwed to the lead screw. The output shaft of the motor drive component is connected to the lead screw and drives the lead screw flange to move along the axis of the lead screw through the lead screw, thereby controlling the closing and opening of the through hole.

[0006] Optionally, it also includes a sliding channel, in which the lead screw flange is slidably disposed. Both the lead screw flange and the sliding channel are provided with abutment surfaces. The abutment surfaces on the lead screw flange abut against the abutment surfaces on the sliding channel and are used to restrict the rotation of the lead screw flange.

[0007] Optionally, the on / off control component further includes a sealing gasket, which is fixed to the lead screw flange and used to control the closing and opening of the through hole.

[0008] Optionally, the on / off control component includes a ball valve, which is located between the air inlet and the air outlet and is used to control the on / off connection between the air inlet and the air outlet. The motor drive component is connected to the ball valve and is used to drive the ball valve to rotate.

[0009] Secondly, the refueling system provided in this application uses the following technical solution: A refueling system includes a fuel tank, a refueling pipe, a circulation pipe, and an electric fuel cut-off valve. The refueling pipe is connected to the fuel tank, one end of the circulation pipe is connected to the fuel tank, and the other end is connected to the refueling pipe. The electric fuel cut-off valve is installed on the circulation pipe and is used to control the on / off state of the circulation pipe.

[0010] This application has the following advantages over the prior art: First, this application achieves precise control over the flow of oil and gas by installing an electric oil and gas shut-off valve on the circulation pipe and using a motor-driven component to switch the on / off control component between state one and state two. During refueling, the valve can be controlled to close, cutting off the oil and gas circulation path between the fuel tank and the refueling pipe head, preventing oil and gas from escaping into the atmosphere through the circulation pipe during refueling, effectively reducing emissions and improving environmental performance. During non-refueling conditions, the valve can be controlled to open, ensuring connection between the fuel tank and the refueling pipe, facilitating OBD testing.

[0011] Secondly, in the embodiment using a lead screw and lead screw flange, the rotation of the lead screw drives the translation of the lead screw flange to seal the through hole. Combined with the limiting effect of the contact surface, the structure is compact and the transmission is stable, which can provide a large sealing pressure and ensure airtightness when cut off. Attached Figure Description

[0012] Figure 1 This is a cross-sectional structural schematic diagram of Embodiment 1 of the electric oil and gas shut-off valve of this application.

[0013] Figure 2 This is a cross-sectional structural schematic diagram of Embodiment 2 of the electric oil and gas shut-off valve of this application.

[0014] In the diagram, 1 is the oil and gas passage; 11 is the air inlet; 12 is the air outlet; 13 is the through hole; 14 is the sliding passage; 2 is the on / off control component; 21 is the lead screw; 22 is the lead screw flange; 23 is the sealing gasket; 24 is the ball valve; 3 is the motor drive component; and 4 is the valve body. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1 Appendix Figure 2 This application will be described in further detail below.

[0016] A refueling system includes a fuel tank, a refueling hose, a circulation hose, and an electrically operated fuel-air shut-off valve. The refueling hose is connected to the fuel tank for adding fuel to the tank. The circulation hose connects the fuel tank and the head of the refueling hose, and serves to balance pressure under normal conditions. The electrically operated fuel-air shut-off valve is installed on the circulation hose and is used to control the opening and closing of the circulation hose, thereby managing the flow path of fuel vapor within the fuel tank.

[0017] Regarding electric oil / gas shut-off valves: Refer to... Figure 1 The electric oil / gas shut-off valve includes a valve body 4, an oil / gas passage 1 disposed within the valve body 4, an on / off control component 2 disposed within the valve body 4, and a motor drive component 3 mounted on the valve body 4. The oil / gas passage 1 is the location for oil / gas flow, and includes an inlet end 11 and an outlet end 12. The inlet end 11 communicates with the side of the circulation pipe near the fuel tank, and the outlet end 12 communicates with the side of the circulation pipe near the refueling pipe. The motor drive component is equipped with a connector for receiving valve switching control signals from the vehicle controller. In some embodiments, both the inlet end 11 and the outlet end 12 are provided with connectors for easy connection and disconnection from the circulation pipe. The connectors can be expanded to various specifications of quick-connect fittings and can be extended from two-way to three-way or multi-way connectors.

[0018] The on / off control component 2 is movably disposed within or cooperates with the oil-gas passage 1, and exists in two states: State 1 and State 2. When the on / off control component 2 is in State 1, the oil-gas passage 1 is blocked, and gas cannot flow from the inlet end 11 to the outlet end 12; when the on / off control component 2 is in State 2, the oil-gas passage 1 is unobstructed, and gas can flow freely. The output shaft of the motor drive component 3 is connected to the on / off control component 2, and the rotation of the motor drive component 3 drives the on / off control component 2 to switch its operation. Example 1:

[0019] Regarding the specific structure of the on / off control component 2: In some embodiments, the inlet end 11 of the oil-gas passage 1 is L-shaped, and a through hole 13 is opened at the end facing the on / off control component 2, allowing the inlet end 11 to communicate with the outlet end 12 through the through hole 13. The on / off control component 2 includes a lead screw 21 and a lead screw flange 22. The motor drive component 3 is fixedly mounted on the valve body 4, and its output shaft is fixedly connected to the lead screw 21. The lead screw flange 22 is threadedly connected to the lead screw 21. When the motor drive component 3 rotates, it drives the lead screw 21 to rotate in its original position. In order to convert the rotational motion of the lead screw 21 into the linear motion of the lead screw flange 22, a sliding channel 14 is also provided inside the valve body 4. The lead screw flange 22 is slidably disposed within the sliding channel 14. The outer wall (i.e., the contact surface) of the lead screw flange 22 is shaped to match the inner wall (i.e., the contact surface) of the sliding channel 14, for example, by using a non-circular cross-section (such as square or D-shaped) or by providing a guide key, so that the lead screw flange 22 cannot rotate with the lead screw 21, but can only move along the axis of the lead screw 21. During the movement, the lead screw flange 22 can move closer to or further away from the through hole 13. When the lead screw flange 22 moves to the position covering and pressing the through hole 13, it is state one, and the oil and gas passage 1 is disconnected; when the lead screw flange 22 moves and disengages from the position of the through hole 13, it is state two, and the oil and gas passage 1 is connected.

[0020] In some embodiments, to improve sealing performance, the on / off control component 2 further includes a sealing gasket 23. The sealing gasket 23 is fixedly installed on the side of the screw flange 22 facing the through hole 13. When in state one, the sealing gasket 23 is tightly fitted against the edge of the through hole 13 under the thrust of the screw flange 22, effectively preventing gas leakage and ensuring zero-leakage cutoff. The sealing gasket 23 may be made of an elastic material such as oil-resistant rubber. Example 2:

[0021] Regarding another structure of the on / off control component 2: Refer to Figure 2 In some embodiments, the on / off control component 2 adopts a ball valve 24 structure. The ball valve 24 is rotatably disposed between the inlet end 11 and the outlet end 12 and communicates with the inlet end 11 and the outlet end 12. A through flow channel is opened inside the ball valve 24. The output shaft of the motor drive component 3 is directly or through a reduction mechanism connected to the ball valve 24. When the motor drive component 3 drives the ball valve 24 to rotate until the flow channel of the ball valve core is parallel to the axis of the oil and gas passage 1, it is in a fully connected state; when the ball valve 24 rotates to rotate until the flow channel is perpendicular to the axis of the oil and gas passage 1, it is in a disconnected state. This structure has the characteristics of low flow resistance and rapid opening and closing.

[0022] The implementation principle of this application embodiment is as follows: During normal driving or parking, the electric oil and gas shut-off valve remains open (state two). At this time, the motor drive component 3 controls the on / off control component 2 (e.g., the screw flange 22 is away from the through hole 13, or the flow channel of the ball valve 24 is aligned), so that the circulation pipe is unobstructed. The pressure in the fuel tank can be balanced by the circulation pipe and the head of the refueling pipe, preventing the fuel tank from being sucked flat or bulging. When the vehicle needs to refuel, the vehicle control system (e.g., receiving a refueling cap opening signal or a refueling mode command from the instrument panel) controls the motor drive component 3 to operate. If a screw 21 structure is used, the motor rotates forward, driving the screw 21 to rotate. Limited by the limit of the sliding channel 14, the screw flange 22 moves forward axially until the sealing gasket 23 presses against the through hole 13, completely cutting off the oil and gas passage 1 (state one). At this time, the air passage between the fuel tank and the head of the refueling pipe is disconnected. During the refueling process, the fuel vapor squeezed in the fuel tank cannot flow back to the refueling pipe opening through the circulation pipe to escape, thereby reducing refueling emissions. After refueling is completed, the motor drive component 3 reverses, the lead screw flange 22 retracts, the oil and gas passage 1 is reconnected, and the normal pressure regulation function is restored.

[0023] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electric oil / gas shut-off valve, characterized in that, include: The oil and gas passage (1) includes an air inlet (11) and an air outlet (12). The air inlet (11) is used to connect with the oil tank side of the circulation pipe, and the air outlet (12) is connected with the refueling pipe side of the circulation pipe. The on / off control component (2) has a state one and a state two. When the on / off control component (2) is in state one, the oil and gas passage (1) is in the off state. When the on / off control component (2) is in state two, the oil and gas passage (1) is in the connected state. The motor drive component (3) has its output shaft connected to the on / off control component (2) and drives the on / off control component (2) to switch between state one and state two by rotation.

2. The electric oil / gas shut-off valve according to claim 1, characterized in that, The oil and gas passage (1) is provided with a through hole (13), and the air inlet (11) is connected to the air outlet (12) through the through hole (13); The on / off control component (2) includes a lead screw (21) and a lead screw flange (22) screwed to the lead screw (21). The output shaft of the motor drive component (3) is connected to the lead screw (21) and drives the lead screw flange (22) to move along the axis of the lead screw (21) through the lead screw (21), and the lead screw flange (22) controls the closing and opening of the through hole (13).

3. The electric oil / gas shut-off valve according to claim 2, characterized in that, It also includes a sliding channel (14), in which the lead screw flange (22) is slidably disposed. Both the lead screw flange (22) and the sliding channel (14) are provided with abutting surfaces. The abutting surfaces on the lead screw flange (22) abut against the abutting surfaces on the sliding channel (14) and are used to restrict the rotation of the lead screw flange (22).

4. An electric oil / gas shut-off valve according to claim 2 or 3, characterized in that, The on / off control component (2) also includes a sealing gasket (23), which is fixed on the screw flange (22) and used to control the closing and opening of the through hole (13).

5. An electric oil / gas shut-off valve according to claim 1, characterized in that, The on / off control component (2) includes a ball valve (24), which is located between the air inlet (11) and the air outlet (12) and is used to control the on / off between the air inlet (11) and the air outlet (12). The motor drive component (3) is connected to the ball valve (24) and is used to drive the ball valve (24) to rotate.

6. A refueling system, characterized in that, The device includes a fuel tank, a refueling pipe, a circulation pipe, and an electric fuel shut-off valve. The electric fuel shut-off valve is an electric fuel shut-off valve as described in any one of claims 1 to 5. The refueling pipe is connected to the fuel tank. One end of the circulation pipe is connected to the fuel tank, and the other end is connected to the refueling pipe. The electric fuel shut-off valve is installed on the circulation pipe and is used to control the opening and closing of the circulation pipe.

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