Electromagnetic oil and gas shut-off valve and refueling system

Abstract

The application relates to the technical field of oil and gas detection, in particular to an electromagnetic oil and gas cut-off valve and a refueling system. The electromagnetic oil and gas cut-off valve comprises a valve body, an oil and gas channel arranged in the valve body and comprising an air inlet end and an air outlet end, the air inlet end being connected to a circulating pipe oil tank side, and the air outlet end being connected to a circulating pipe refueling pipe side; an on-off control component arranged in the valve body and having a state one and a state two, when the on-off control component is in the state one, the air inlet end is disconnected from the air outlet end, and when the on-off control component is in the state two, the air inlet end is communicated with the air outlet end; and an electromagnetic driving component, the electromagnetic driving component can drive the on-off control component to move linearly, so that the on-off control component is switched between the state one and the state two. The application can effectively control the on-off of a circulating pipe, can meet the detection requirement of an on-board diagnostic system, can prevent the escape of fuel volatile gas during the refueling process, and can reduce environmental pollution.

Description

Technical Field

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

[0002] A car's fuel system typically includes a fuel tank, a refueling hose, and other piping components. To effectively monitor the fuel system's sealing integrity, modern vehicles are usually equipped with on-board diagnostic systems. In this system, the recirculation hose connecting the fuel tank and the refueling hose plays a crucial auxiliary detection role. When the fuel level in the tank rises and submerges the lower end of the refueling hose, the detection device typically uses the airflow path provided by this recirculation hose to detect any fuel vapor leaks in the refueling hose.

[0003] In existing refueling pipeline technology, to ensure the unobstructed flow of the aforementioned detection path, the circulation pipe located at the head of the refueling pipe is typically designed as a continuously flowing structure. In this structure, the circulation pipe forms a continuously connected airflow channel between the internal space of the fuel tank and the head of the refueling pipe, allowing gas to flow within the pipeline to maintain the necessary flow path for detection.

[0004] However, this normally open connection method has certain drawbacks in practical applications. Because the recirculation pipe remains open at all times, when the vehicle is refueling, the fuel vapors generated in the fuel tank flow back into the head of the refueling pipe through this recirculation pipe, and further escape from the refueling port into the outside air, resulting in increased fuel vapor emissions during the refueling process, which is not conducive to the vehicle meeting increasingly stringent environmental emission requirements. Utility Model Content

[0005] The purpose of this application is to provide an electromagnetic oil and gas shut-off valve and a refueling system, which can effectively control the opening and closing of the circulation pipeline, meet the testing requirements of the on-board diagnostic system, prevent the escape of fuel vapors during refueling, and reduce environmental pollution.

[0006] Firstly, the electromagnetic oil-gas shut-off valve provided in this application adopts the following technical solution: An electromagnetic oil / gas shut-off valve, comprising: Valve body; An oil and gas passage is provided in the valve body and includes an inlet end and an outlet end. The inlet end is connected to the oil tank side of the circulation pipe, and the outlet end is connected to the refueling pipe side of the circulation pipe. An on / off control component is provided in the valve body and has two states: state one and state two. When the on / off control component is in state one, the air inlet end is disconnected from the air outlet end. When the on / off control component is in state two, the air inlet end is connected to the air outlet end. An electromagnetic drive component is provided, which can drive the on / off control component to move linearly, thereby switching the on / off control component between state one and state two.

[0007] Optionally, the electromagnetic drive component includes a coil, a mounting bracket, an iron core, a connector, and a sliding part. The coil is wound on the mounting bracket, and the connector is mounted on the valve body and used to connect to an external power source and supply power to the coil. The mounting bracket has a sliding hole in the middle, the iron core is fixed therein, and the sliding part is slidably placed in the sliding hole and connected to the on / off control component. The iron core can drive the sliding part to slide along the axis of the sliding hole through magnetic force.

[0008] Optionally, the sliding part is made of a soft magnetic material with high permeability and low remanence, or the sliding part (35) is made of a non-magnetic metal material that can be attracted by magnetic force.

[0009] Optionally, the electromagnetic drive component further includes a guide sleeve made of antimagnetic material, which is disposed in the sliding hole and simultaneously sleeved on the iron core and the sliding part.

[0010] Optionally, the electromagnetic drive component further includes an elastic element, one end of which acts on the valve body and the other end of which acts on the on / off control component.

[0011] Optionally, the oil and gas passage further includes a through hole, the air inlet end is connected to the air outlet end through the through hole, the on / off control component includes a sealing gasket, and the sliding part is used to drive the sealing gasket to move towards or away from the through hole, so that the sealing gasket seals or opens the through hole.

[0012] Optionally, the on / off control component further includes a valve seat, a T-shaped connector is fixedly connected to the sliding part, the valve seat has a slot adapted to the T-shaped connector, the T-shaped connector is disposed in the slot and there is a gap between it and the inner wall of the slot.

[0013] Optionally, the valve seat has an opening that communicates with the valve seat, and the T-shaped connector can be inserted into the slot through the opening.

[0014] Optionally, the valve seat is made of a deformable material and the opening is smaller than that of the T-shaped connector.

[0015] Secondly, the refueling system provided in this application adopts the following technical solution: A refueling system includes a fuel tank, a refueling pipe, a circulation pipe, and an electromagnetic 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 electromagnetic fuel cut-off valve is installed on the circulation pipe and is used to control the on / off state of the circulation pipe.

[0016] This application employs a combination of electromagnetic drive, oil and gas valve, floating seal, and magnetic circuit optimization techniques. These technologies work synergistically to creatively resolve the inherent contradiction between "detection requirements" and "environmental protection requirements." Compared to existing technologies, this application offers the following advantages: First, this application utilizes an electromagnetic oil-gas shut-off valve, employing an electromagnetic drive component to control the opening and closing of the oil-gas passage. During refueling, the shut-off valve is closed (State 1), blocking the oil-gas passage between the fuel tank and the refueling hose head. This effectively prevents fuel vapors from flowing back into the atmosphere through the recirculation pipe. Compared to traditional normally open recirculation pipe systems, this significantly reduces hydrocarbon evaporation pollutant emissions during refueling, thus lowering overall emissions. When on-board diagnostics system testing is required, the shut-off valve is open (State 2), ensuring unobstructed airflow for testing, thus balancing environmental protection and functionality.

[0017] Secondly, this application employs a floating structure with a T-shaped connector and a slot at the connection between the sliding part and the valve seat, and reserves a gap between them. This design allows for a certain relative movement space between the sliding part (moving iron core) and the valve seat. When the sliding part tilts slightly or has a coaxiality deviation during movement, the valve seat can still maintain a good posture and fit well with the sealing plane, thus eliminating the effect of tilt and ensuring reliable sealing of the airflow channel by the sealing gasket.

[0018] Third, this application introduces a guide sleeve made of antimagnetic material into the electromagnetic drive component, which is located between the iron core and the coil. On the one hand, the guide sleeve has a smooth and wear-resistant surface, reducing the frictional resistance during the movement of the sliding part and extending its service life; on the other hand, the antimagnetic material is not magnetized and will not generate magnetic force when the electromagnetic coil is energized, thus not causing any negative impact on the drive part. This makes the electromagnetic oil and gas shut-off valve of this utility model move flexibly, ensuring the valve's response speed and operational reliability. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural schematic diagram of an electromagnetic oil and gas shut-off valve in an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the cooperation structure between the sliding part and the valve seat in an embodiment of this application.

[0021] In the diagram, 1 is the valve body; 11 is the air inlet; 12 is the air outlet; 13 is the through hole; 2 is the on / off control component; 21 is the sealing gasket; 22 is the valve seat; 221 is the slot; 222 is the opening; 3 is the electromagnetic drive component; 31 is the coil; 32 is the mounting bracket; 321 is the sliding hole; 33 is the iron core; 34 is the plug-in component; 35 is the sliding part; 351 is the T-type connector; 36 is the guide sleeve; and 37 is the elastic element. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1 -Appendix Figure 2 This application will be described in further detail below.

[0023] A refueling system includes a fuel tank, a refueling hose, a recirculation hose, and an electromagnetic fuel cut-off valve. The refueling hose is connected to the fuel tank for adding fuel. One end of the recirculation hose is connected to the fuel tank, and the other end is connected to the refueling hose near the filler neck. The electromagnetic fuel cut-off valve is installed on the recirculation hose and is used to control the opening and closing of the recirculation hose according to the vehicle's status. Under the control of this electromagnetic fuel cut-off valve, the recirculation hose can be shut off during refueling to prevent fuel leakage; during leak detection by the on-board diagnostic (OBD) system, the recirculation hose can be opened to provide the necessary detection path.

[0024] Regarding electromagnetic oil / gas shut-off valves: Reference Figure 1 The electromagnetic oil-gas shut-off valve includes a valve body 1, an oil-gas passage, an on / off control component 2, and an electromagnetic drive component 3. The valve body 1 serves as the main support structure, and an oil-gas passage is provided inside. The oil-gas passage includes an inlet end 11, an outlet end 12, and a through hole 13 connecting the two. The inlet end 11 connects to the oil tank side of the circulation pipe, and the outlet end 12 connects to the refueling pipe side of the circulation pipe. The on / off control component 2 is movably disposed within the valve body 1 and can move relative to the through hole 13 to seal or open the through hole 13, thereby controlling the on / off connection between the inlet end 11 and the outlet end 12. In a specific embodiment, the inlet end 11 is L-shaped, and the through hole 13 is located at the end of the inlet end 11 near the on / off control component 2.

[0025] The electromagnetic drive component 3 includes a coil 31, a mounting bracket 32, an iron core 33, a connector 34, a sliding part 35, and a guide sleeve 36. The mounting bracket 32 ​​serves as the winding frame for the coil 31, and the coil 31 is wound around the mounting bracket 32. The connector 34 is fixed to the upper part of the valve body 1 and is used to connect to an external power supply connector to power the coil 31. An axially penetrating sliding hole 321 is formed in the middle of the mounting bracket 32, and the iron core 33 is fixedly mounted on the upper part of the sliding hole 321 as a fixed iron core. The sliding part 35 serves as a moving iron core, slidably disposed in the lower part of the sliding hole 321, and located below the iron core 33.

[0026] In some embodiments, the sliding part 35 is made of a soft magnetic material with high permeability and low remanence, such as pure iron or silicon steel, so that it can be quickly magnetized to generate attraction when energized and quickly demagnetized when de-energized.

[0027] In some embodiments, the sliding part 35 may also be made of a material that cannot be magnetized but can be magnetically attracted, and the sliding part 35 can be moved by magnetizing the iron core.

[0028] The guide sleeve 36 is disposed within the sliding hole 321 and is in the form of a thin-walled tube, simultaneously fitting around the outer periphery of the iron core 33 and the sliding part 35. The guide sleeve 36 is made of antimagnetic materials (non-magnetic materials) such as brass or austenitic stainless steel. The guide sleeve 36 serves multiple purposes: its smooth surface reduces frictional resistance during the sliding of the sliding part 35; its wear-resistant material improves the durability of the component; and as an antimagnetic material, it prevents magnetization, enhancing the flexibility and reliability of the electromagnetic oil and gas shut-off valve.

[0029] In some embodiments, the electromagnetic drive component 3 further includes an elastic element 37, which is a spring. The elastic element 37 is installed between the sliding portion 35 and the inner wall of the valve body 1 (or between the valve seat and the iron core; depending on the structural layout, in this embodiment, the elastic element 37 is sleeved on the lower end of the sliding portion 35 with one end abutting against the step of the valve body 1 and the other end acting on the on / off control component; in other embodiments, it can act on the sliding portion), and is used to provide a reset force to the sliding portion 35. When the coil 31 is de-energized, the elastic element 37 pushes the sliding portion 35 downward to reset.

[0030] The on / off control component 2 includes a valve seat 22 and a sealing gasket 21. The sealing gasket 21 is installed at the bottom of the valve seat 22 and is made of elastic sealing material such as rubber. The valve seat 22 is connected to the sliding part 35. When the sliding part 35 moves up and down in the sliding hole 321, it drives the valve seat 22 and the sealing gasket 21 to move synchronously. When the sealing gasket 21 is pressed against the edge of the through hole 13, the oil and gas passage is cut off (state one); when the sealing gasket 21 leaves the through hole 13, the oil and gas passage is connected (state two).

[0031] Reference Figure 1 and Figure 2 In some embodiments, to address the potential issue of incomplete sealing due to tilting during the vertical movement of the sliding part 35 (moving iron core), a floating connection structure is employed between the sliding part 35 and the valve seat 22. Specifically, a T-shaped connector 351 is fixedly connected to the lower end of the sliding part 35, and a slot 221 adapted to the T-shaped connector 351 is provided on the valve seat 22. The T-shaped connector 351 is inserted into the slot 221. When the T-shaped connector 351 is placed in the slot 221, a gap is reserved between them, with the gap size between 0.3 and 0.7 mm, specifically 0.5 mm.

[0032] The sliding part 35 mainly moves in a linear motion, but a slight tilt angle is inevitable. If the valve seat 22 is rigidly fixed to the sliding part 35, the tilt of the sliding part 35 will directly cause the sealing gasket 21 to tilt, thus creating a gap at the through hole 13 and affecting the sealing effect. By setting a gap, the valve seat 22 has a certain degree of freedom relative to the sliding part 35. Even if the sliding part 35 tilts, the valve seat 22 can automatically adjust its posture to fit the sealing surface under pressure at the moment the sealing gasket 21 contacts the sealing surface, eliminating the effect of tilt and ensuring the sealing effect.

[0033] In some embodiments, the valve seat 22 is further provided with an opening 222, which communicates with the slot 221. For ease of assembly, the rod of the T-shaped connector 351 slides laterally into the slot 221 through the opening 222. To prevent the T-shaped connector 351 from slipping out during use, the width of the opening 222 is slightly smaller than the outer diameter of the rod of the T-shaped connector 351. The valve seat 22 is made of a common plastic or other material with a certain degree of elasticity. During assembly, utilizing the principle of cantilever micro-deformation, the T-shaped connector 351 is pushed into the opening 222 with force. The opening 222 elastically expands to allow the rod to pass through, and then springs back to lock the rod in the slot 221.

[0034] The implementation principle of this application embodiment is as follows: When the vehicle is in a state of engine shutdown or normal refueling, the coil 31 of the electromagnetic fuel cut-off valve is de-energized. At this time, the electromagnetic attraction disappears, and under the elastic force of the elastic element 37, the sliding part 35 and the connected valve seat 22 are pushed downward, so that the sealing gasket 21 is pressed tightly against the through hole 13 of the valve body 1, cutting off the fuel gas passage. At this time, the fuel volatiles in the fuel tank cannot enter the refueling pipe through the circulation pipe, thereby preventing fuel gas leakage; when the on-board diagnostic system needs to check the fuel system During leak detection, the coil 31 is energized through the connector 34. The coil 31 generates a magnetic field, the iron core 33 is magnetized, and it generates an upward electromagnetic attraction on the sliding part 35 (moving iron core). This attraction overcomes the elastic force of the elastic element 37 and the weight of the component, pulling the sliding part 35 to slide upward along the guide sleeve 36. The sliding part 35 drives the valve seat 22 to move upward through the T-shaped connector 351, causing the sealing gasket 21 to disengage from the through hole 13, thereby opening the oil and gas passage and allowing the detection airflow to pass smoothly, thus completing the system detection.

[0035] 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 electromagnetic oil / gas shut-off valve, characterized in that, include: Valve body (1); An oil and gas passage is provided inside the valve body (1) and includes an air inlet (11) and an air outlet (12). The air inlet (11) is used to connect to the oil tank side of the circulation pipe, and the air outlet (12) is used to connect to the refueling pipe side of the circulation pipe. The on / off control component (2) is located in the valve body (1) and has two states: state one and state two. When the on / off control component (2) is in state one, the air inlet (11) is disconnected from the air outlet (12). When the on / off control component (2) is in state two, the air inlet (11) is connected to the air outlet (12). The electromagnetic drive component (3) can drive the on / off control component (2) to move linearly, so that the on / off control component (2) switches between state one and state two.

2. The electromagnetic oil / gas shut-off valve according to claim 1, characterized in that, The electromagnetic drive component (3) includes a coil (31), a mounting bracket (32), an iron core (33), a connector (34), and a sliding part (35). The coil (31) is wound on the mounting bracket (32), and the connector (34) is mounted on the valve body (1) and is used to connect to an external power source and supply power to the coil (31). The mounting bracket (32) has a sliding hole (321) in the middle. The iron core (33) is fixedly installed on the mounting bracket (32). The sliding part (35) is slidably placed in the sliding hole (321) and connected to the on / off control component (2). The iron core (33) can drive the sliding part (35) to slide along the axis of the sliding hole (321) by magnetic force.

3. The electromagnetic oil / gas shut-off valve according to claim 2, characterized in that, The sliding part (35) is made of a soft magnetic material with high permeability and low remanence, or the sliding part (35) is made of a non-magnetic metal material that can be attracted by magnetic force.

4. The electromagnetic oil / gas shut-off valve according to claim 2, characterized in that, The electromagnetic drive component (3) also includes a guide sleeve (36) made of antimagnetic material. The guide sleeve (36) is disposed in the sliding hole (321) and simultaneously sleeved on the iron core (33) and the sliding part (35).

5. An electromagnetic oil / gas shut-off valve according to any one of claims 2 to 4, characterized in that, The electromagnetic drive component (3) also includes an elastic element (37), one end of which acts on the valve body (1) and the other end acts on the on / off control component (2) or the sliding part (35).

6. The electromagnetic oil / gas shut-off valve according to claim 2, characterized in that, The oil and gas passage also includes a through hole (13), the air inlet (11) is connected to the air outlet (12) through the through hole (13), the on / off control component (2) includes a sealing gasket (21), and the sliding part (35) is used to drive the sealing gasket (21) to move closer to or further away from the through hole (13) so that the sealing gasket (21) seals or opens the through hole (13).

7. An electromagnetic oil / gas shut-off valve according to claim 6, characterized in that, The on / off control component (2) also includes a valve seat (22), and a T-shaped connector (351) is fixedly connected to the sliding part (35). The valve seat (22) has a slot (221) adapted to the T-shaped connector (351). The T-shaped connector (351) is located in the slot (221) and there is a gap between it and the inner wall of the slot (221).

8. An electromagnetic oil / gas shut-off valve according to claim 7, characterized in that, The valve seat (22) has an opening (222) that communicates with the valve seat (22). The T-shaped connector (351) can be inserted into the slot (221) through the opening (222).

9. An electromagnetic oil / gas shut-off valve according to claim 8, characterized in that, The valve seat (22) is made of a deformable material and the opening (222) is smaller than the T-shaped connector (351).

10. A refueling system, characterized in that, The device includes a fuel tank, a refueling pipe, a circulation pipe, and an electromagnetic fuel cut-off valve. The electromagnetic fuel cut-off valve is an electromagnetic fuel cut-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 electromagnetic fuel cut-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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