Fuel tank isolation valve, fuel tank system and vehicle

Abstract

The present application provides a fuel tank isolation valve, a fuel tank system and a vehicle. The fuel tank isolation valve includes a shell, a first sealing part and a movable part. The shell is provided with a first connecting port and a second connecting port, the first connecting port is used to connect to the fuel tank, and the second connecting port is used to connect to the oil and gas adsorption and desorption device. A partition is provided in the shell, and the partition divides the inner cavity of the shell into a first chamber and a second chamber. The first chamber is connected to the first connecting port, and the second chamber is connected to the second connecting port. The partition is provided with a first through hole and a second through hole. The first sealing part is used to block the first through hole. The movable part is located in the first chamber and is provided with a second sealing part. When the pressure of the oil and gas in the fuel tank is greater than the first threshold value, the oil and gas entering the first chamber push the first sealing part to move in the direction away from the partition, so that the first through hole is opened. When the pressure in the fuel tank is less than the second threshold value, the external air entering the second chamber through the oil and gas adsorption and desorption device pushes the second sealing part to move, and the second through hole is opened.

Description

Technical Field

[0001] The present application relates to the technical field of leakage diagnosis, and in particular to a fuel tank isolation valve, a fuel tank system and a vehicle. Background Art

[0002] With improved living standards, cars have become a common means of transportation. A car's fuel tank is connected to a carbon canister, where the fuel and vapor in the tank enter and are adsorbed by the activated carbon inside. The canister is then connected to the outside air. When the car's engine is started, the fuel and vapor, along with fresh air, are fed into the engine for combustion.

[0003] However, for hybrid vehicles, if the vehicle is in electric drive mode for a long time, the oil and gas in the carbon canister cannot be delivered to the engine. After the activated carbon in the carbon canister is saturated with oil and gas, the excess oil and gas will be discharged into the atmosphere, causing environmental pollution. Summary of the Invention

[0004] The present application provides a fuel tank isolation valve, a fuel tank system and a vehicle.

[0005] According to a first aspect of an embodiment of the present application, a fuel tank isolation valve is provided, the fuel tank isolation valve comprising:

[0006] a housing, the housing being provided with a first communication port and a second communication port, the first communication port being used to connect to the oil tank, and the second communication port being used to connect to the oil-gas adsorption-desorption device; a partition being provided within the housing, the partition being used to separate the inner cavity of the housing into a first chamber and a second chamber; the first chamber being in communication with the first communication port, and the second chamber being in communication with the second communication port; the partition being provided with a first through hole and a second through hole;

[0007] a first blocking portion, used for blocking the first through hole, located in the second cavity;

[0008] a moving portion, located in the first chamber, the moving portion being provided with a second blocking portion for blocking the second through hole;

[0009] When the pressure of the oil and gas in the oil tank is greater than a first threshold value, the oil and gas entering the first chamber push the first blocking part to move away from the partition, so that the first through hole opens; when the pressure in the oil tank is less than a second threshold value, the external air entering the second chamber through the oil and gas adsorption and desorption device pushes the second blocking part to move away from the partition, so that the second through hole opens.

[0010] In one embodiment, the fuel tank isolation valve further includes a supporting portion and a first elastic member; the supporting portion is fixed to the first chamber, the first elastic member is located in the first chamber, one end of the first elastic member is in contact with the supporting portion, and the other end is in contact with the movable portion;

[0011] When the pressure in the oil tank is less than the second threshold value, the second blocking part moves away from the partition, and the first elastic part is compressed; when the pressure in the oil tank is greater than the second threshold value, the first elastic part stretches, driving the second blocking part to resist the partition, and the second blocking part blocks the second through hole.

[0012] In one embodiment, the fuel tank isolation valve further includes a second elastic member, the second elastic member is located in the first chamber, and the fuel tank isolation valve further includes a baffle movably disposed in the first chamber, one end of the second elastic member abuts against the baffle, and the other end abuts against the partition; the first blocking portion is connected to the baffle;

[0013] When the pressure of the oil and gas in the oil tank is greater than the first threshold value, the first blocking part moves away from the partition and the second elastic part is compressed; when the pressure of the oil and gas in the oil tank is less than the first threshold value, the second elastic part stretches, driving the first blocking part to resist the partition, and the first blocking part blocks the first through hole.

[0014] In one embodiment, the movable portion includes an annular main body portion, a side portion of the main body portion is provided with a through hole, the baffle is movably disposed in the main body portion, and the second elastic member is accommodated in the main body portion.

[0015] In one embodiment, the second blocking portion is formed by extending outward from one end of the main body close to the partition, and the second through hole is provided on a peripheral side of the first through hole.

[0016] In one embodiment, the first chamber is further provided with a driving portion, which is connected to the moving portion; the driving portion can drive the moving portion to move in a direction away from the partition, so that the second through hole is opened.

[0017] In one embodiment, the driving unit includes a motor; or,

[0018] The driving portion includes an electromagnetic coil, a first magnetic member, and a second magnetic member. The first magnetic member is fixed in the electromagnetic coil, and the second magnetic member is movably located in the electromagnetic coil and connected to the moving portion. The first magnetic member and the second magnetic member are magnetic members that can be magnetized in a magnetic field.

[0019] When the electromagnetic coil is energized, the first magnetic member generates a magnetic attraction force on the second magnetic member, driving the second magnetic member and the moving part to move in a direction away from the partition; when the electromagnetic coil is de-energized, the magnetic attraction force of the first magnetic member on the second magnetic member disappears.

[0020] In one embodiment, the fuel tank isolation valve further includes a supporting portion and a first elastic member; the supporting portion is fixed to the first chamber, one end of the first elastic member is in contact with the supporting portion, and the other end is in contact with the moving portion;

[0021] When the driving part includes an electromagnetic coil, a first magnetic part and a second magnetic part, the first magnetic part and the supporting part are an integrated structure, the supporting part abuts against the wall of the shell, an annular groove is provided on the outside of the supporting part, and an annular sealing part is provided in the annular groove.

[0022] In one embodiment, the first blocking portion includes a first plate portion and a first sealing structure located at least on the side of the first plate portion close to the partition; and / or the second blocking portion includes a second plate portion and a second sealing structure located at least on the side of the second plate portion close to the partition.

[0023] According to a second aspect of an embodiment of the present application, there is provided a fuel tank system, comprising a fuel tank, an oil and gas adsorption and desorption device, and the above-mentioned fuel tank isolation valve;

[0024] The oil tank is connected to the first communication port of the oil tank isolation valve, and the oil and gas adsorption and desorption device is connected to the second communication port of the oil tank isolation valve.

[0025] According to a third aspect of an embodiment of the present application, a vehicle is provided, comprising the above-mentioned fuel tank system.

[0026] The fuel tank isolation valve, fuel tank system and vehicle provided by the embodiments of the present application are configured such that a first through hole and a second through hole are provided on the partition. When the pressure of the oil and gas in the fuel tank is greater than a first threshold value, the oil and gas entering the first chamber pushes the first blocking portion to move in a direction away from the partition, causing the first through hole to open, so that the oil and gas in the fuel tank can enter the oil and gas adsorption and desorption device through the first through hole and be adsorbed, thereby avoiding excessive pressure in the fuel tank; the first through hole is only opened when the oil and gas pressure in the fuel tank is greater than the first threshold value. When the oil and gas pressure in the fuel tank is less than the first threshold value, the first through hole is not opened, and the oil and gas in the fuel tank is temporarily stored in the fuel tank, which can avoid, to a certain extent, environmental pollution caused by saturation of oil and gas adsorbed by the oil and gas adsorption and desorption device; when the fuel tank pressure is less than the second threshold value, the external air entering the second chamber pushes the second blocking portion to move in a direction away from the partition, causing the second through hole to open, so that the external air can enter the fuel tank through the second through hole and the first chamber, thereby preventing deformation of the fuel tank caused by excessive pressure in the fuel tank.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0029] Figure 1 A schematic diagram of the three-dimensional structure of a fuel tank isolation valve provided in one embodiment of the present application;

[0030] Figure 2 for Figure 1 The schematic diagram of the exploded structure of the fuel tank isolation valve shown in FIG.

[0031] Figure 3 for Figure 1 A cross-sectional view of the fuel tank isolation valve shown in a first state;

[0032] Figure 4 for Figure 1 A cross-sectional view of the fuel tank isolation valve in a second state is shown;

[0033] Figure 5 for Figure 1 A cross-sectional view of the fuel tank isolation valve shown in a third state;

[0034] Figure 6 for Figure 1 A cross-sectional view of the internal structure of the fuel tank isolation valve is shown;

[0035] Figure 7 for Figure 6 Schematic diagram of the three-dimensional structure of the structure shown. DETAILED DESCRIPTION

[0036] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0037] The terms used in this application are for the purpose of describing particular embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0038] It should be understood that the words “first”, “second” and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as “a” or “an” do not indicate a quantity limitation, but rather indicate the presence of at least one. Unless otherwise indicated, words such as “front”, “rear”, “lower” and / or “upper” are for ease of description only and are not limited to one position or one spatial orientation. Words such as “include” or “comprising” mean that the elements or objects appearing before “include” or “comprising” cover the elements or objects listed after “include” or “comprising” and their equivalents, and do not exclude other elements or objects.

[0039] The fuel tank isolation valve, fuel tank system and vehicle of the embodiments of the present application are described in detail below with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can complement or be combined with each other.

[0040] in, Figure 1 A schematic diagram of the three-dimensional structure of a fuel tank isolation valve provided in one embodiment of the present application; Figure 2 for Figure 1 The schematic diagram of the exploded structure of the fuel tank isolation valve shown in FIG. Figure 3 for Figure 1 A cross-sectional view of the fuel tank isolation valve shown in a first state; Figure 4 for Figure 1 A cross-sectional view of the fuel tank isolation valve in a second state is shown; Figure 5 for Figure 1 A cross-sectional view of the fuel tank isolation valve shown in a third state; Figure 6 for Figure 1 A cross-sectional view of the internal structure of the fuel tank isolation valve is shown; Figure 7 for Figure 6 Schematic diagram of the three-dimensional structure of the structure shown.

[0041] The embodiment of the present application provides a fuel tank isolation valve. Figures 1 to 7 The oil tank isolation valve 100 includes a housing 10 , a first blocking portion 20 and a moving portion 30 .

[0042] The shell 10 is provided with a first connecting port 101 and a second connecting port 102. The first connecting port 101 is used to connect to the oil tank, and the second connecting port 102 is used to connect to the oil and gas adsorption and desorption device. A partition 103 is provided in the shell 10, and the partition 103 divides the inner cavity of the shell 10 into a first chamber 104 and a second chamber 105. The first chamber 104 is connected to the first connecting port 101, and the second chamber 105 is connected to the second connecting port 102. The partition 103 is provided with a first through hole 1031 and a second through hole 1032. The first blocking portion 20 is located in the second chamber 105, and the first blocking portion 20 is used to block the first through hole 1031. The first blocking portion 20 is movable in the second chamber 105. The movable portion 30 is located in the first chamber 104, and the movable portion 30 is provided with a second blocking portion 31 for blocking the second through hole 1032.

[0043] Since the oil tank is connected to the first chamber 104 through the first connecting port 101, the pressure in the first chamber 104 is the same as the pressure in the oil tank. Since the oil and gas adsorption and desorption device is connected to the second chamber 105 through the second connecting port 102, and the oil and gas adsorption and desorption device is connected to the atmosphere, the pressure in the second chamber 105 is the same as the atmospheric pressure. When the pressure of the oil and gas in the oil tank is greater than the first threshold, the oil and gas entering the first chamber 104 push the first blocking portion 20 away from the partition 103, causing the first through hole 1031 to open. When the pressure in the oil tank is less than the second threshold, the external air entering the second chamber 105 through the oil and gas adsorption and desorption device pushes the second blocking portion 31 away from the partition 103, causing the second through hole 1032 to open.

[0044] The oil tank isolation valve 100 provided in the embodiment of the present application provides a first through hole 1031 and a second through hole 1032 on the partition 103. When the pressure of the oil and gas in the oil tank is greater than the first threshold, the oil and gas entering the first chamber 104 push the first blocking portion 20 to move away from the partition 103, so that the first through hole 1031 opens, so that the oil and gas in the oil tank can enter the oil and gas adsorption and desorption device through the first through hole 1031 and be adsorbed, thereby avoiding excessive pressure in the oil tank; the first through hole 1031 opens only when the oil and gas pressure in the oil tank is greater than the first threshold, and the oil and gas When the oil and gas pressure in the tank is lower than the first threshold value, the first through hole 1031 is not opened, and the oil and gas in the tank are temporarily stored in the tank, which can avoid environmental pollution caused by the saturation of oil and gas adsorbed by the oil and gas adsorption and desorption device to a certain extent; when the oil and gas pressure in the tank is lower than the second threshold value, the external air entering the second chamber 105 pushes the second blocking part 31 to move away from the partition 103, so that the second through hole 1032 is opened, so that the external air can enter the tank through the second through hole 1032 and the first chamber 104, thereby preventing the pressure in the tank from being too low and causing the tank to deform.

[0045] In this embodiment of the present application, the first threshold is greater than the second threshold, and the oil-gas adsorption-desorption device is in communication with the outside air. When the air pressure within the fuel tank exceeds the first threshold, that is, the pressure exerted by the oil and gas entering the first chamber 104 on the first sealing portion 20 is greater than the pressure exerted by the outside air on the first sealing portion 20, the oil and gas entering the first chamber 104 can push the first sealing portion 20, causing it to move away from the partition 103.

[0046] In one embodiment, the oil tank isolation valve 100 further includes a resisting portion 621 and a first elastic member 41. The resisting portion 621 is fixed to the first chamber 104, and the first elastic member 41 is located in the first chamber 104. One end of the first elastic member 41 resists the resisting portion 621, and the other end resists the moving portion 30. When the pressure in the oil tank is less than the second threshold, the second blocking portion 31 moves away from the partition 103, the first elastic member 41 is compressed, and the second through hole 1032 is opened. At this time, the oil tank isolation valve 100 is in a state as shown in FIG. Figure 4 The second state is shown. When the pressure within the fuel tank exceeds the second threshold, the first elastic member 41 expands, driving the second blocking portion 31 to contact the partition 103, and the second blocking portion 31 blocks the second through hole 1032. The first elastic member 41 may be a spring. When the second blocking portion 31 blocks the second through hole 1032, the elastic force of the first elastic member 41 is a first elastic force, and the second threshold is equal to the difference between the atmospheric pressure and the first elastic force.

[0047] By providing the first elastic member 41, when the pressure in the fuel tank is lower than the second threshold, external air entering the second chamber 105 through the oil and gas adsorption and desorption device exerts a force on the second blocking portion 31 through the second through hole 1032, causing the second blocking portion 31 to move away from the partition 103, thereby opening the second through hole 1032. External air can then enter the fuel tank through the oil and gas adsorption and desorption device, the second chamber 105, the second through hole 1032, and the first chamber 104 in sequence. When the pressure in the oil tank is greater than the second threshold value, the difference between the pressure of the external air on the second sealing part 31 and the pressure of the oil and gas in the first chamber 104 on the second sealing part 31 is less than the elastic force of the first elastic part 41, and the first elastic part 41 stretches, driving the second sealing part 31 to resist the partition 103, and the second sealing part 31 blocks the second through hole 1032, thereby preventing the oil and gas in the oil tank from continuously entering the oil and gas adsorption and desorption device through the second through hole 1032, which may cause the adsorption amount of the oil and gas adsorption and desorption device to be saturated.

[0048] In one embodiment, the fuel tank isolation valve 100 further includes a second elastic member 42 positioned in the first chamber 104. The fuel tank isolation valve 100 also includes a baffle 43 movably disposed within the first chamber 104. One end of the second elastic member 42 abuts against the baffle 43, while the other end abuts against the partition 103. The first blocking portion 20 is connected to the baffle 43. When the pressure of the fuel gas in the fuel tank exceeds a first threshold, the first blocking portion 20 moves away from the partition 103, compressing the second elastic member 42. When the pressure of the fuel gas in the fuel tank falls below the first threshold, the second elastic member 42 expands, driving the first blocking portion 20 against the partition 103, thereby blocking the first through hole 1031. The second elastic member 42 may be a spring. When the first blocking portion 20 blocks the first through hole 1031, the elastic force of the second elastic member 42 is a second elastic force, where the first threshold is equal to the sum of atmospheric pressure and the second elastic force.

[0049] By providing the second elastic member 42 and the baffle 43, when the pressure in the first chamber 104 is greater than the first threshold, the first blocking portion 20 and the baffle 43 move away from the partition 103, thereby opening the first through hole 1031 and compressing the second elastic member 42. At this time, the fuel tank isolation valve 100 is in a state as follows: Figure 3 In the first state shown, the oil and gas within the fuel tank can sequentially pass through the first chamber 104, the first through-hole 1031, and the second chamber 105 to enter the oil and gas adsorption and desorption device, where they are adsorbed, thus preventing excessive oil and gas pressure within the fuel tank. When the pressure within the fuel tank falls below a first threshold, the difference between the pressure exerted by the oil and gas on the first blocking portion 20 and the pressure exerted by the external air on the first blocking portion 20 is less than the elastic force of the second elastic member 42. The second elastic member 42 expands, driving the first blocking portion 20 against the partition 103, causing the first blocking portion 20 to block the first through-hole 1031. This prevents the oil and gas within the fuel tank from continuing to enter the oil and gas adsorption and desorption device through the first through-hole 1031, which could lead to saturation of the adsorption capacity of the oil and gas adsorption and desorption device.

[0050] In one embodiment, the first sealing portion 20 includes a first plate portion 201 and a first sealing structure 202 located at least on the side of the first plate portion 201 closest to the partition 103. This configuration allows the first sealing portion 20 to more effectively seal the first through-hole 1031, preventing gas leakage. In some embodiments, the first sealing structure 202 can be formed on the surface of the first plate portion 201 through an injection molding process, thereby further strengthening the connection between the first sealing structure 202 and the first plate portion 201. The first sealing structure 202 can be planar with protrusions on its surface.

[0051] In one embodiment, the second sealing portion 31 includes a second plate portion 311 and a second sealing structure 312 located at least on one side of the second plate portion 311 close to the partition 103. This configuration allows the second sealing portion 31 to better seal the second through hole 1032, preventing gas leakage. The second sealing structure 312 may cover the second sealing portion 31. In some embodiments, the second sealing structure 312 may be formed on the surface of the second plate portion 311 through an injection molding process, thereby providing a more secure connection between the second sealing structure 312 and the second plate portion 311. The second sealing structure 312 may be bowl-shaped.

[0052] In one embodiment, the movable portion 30 includes an annular main body 32 with a through-hole formed in the side of the main body 32. The baffle 43 is movably disposed within the main body 32, and the second elastic member 42 is housed within the main body 32. This arrangement optimizes the alignment of the baffle 43 with the main body 32, helping to reduce the space occupied by the second elastic member 42, the main body 32, and the baffle 43, thereby reducing the size of the fuel tank isolation valve 100. The through-holes provided in the sidewall of the main body 32 allow gas to pass through the through-holes in the main body 32, without affecting the flow of gas. The first elastic member 41 can be sleeved onto the main body 32, further conserving space in the first chamber 104. When the second elastic member 42 is extended, the baffle 43 can abut against the inner wall of the main body 32.

[0053] In one embodiment, the baffle 43 and the first blocking portion 20 may be connected by a connecting rod 21. The connecting rod 21 is smaller than the first through-hole 1031. When the first through-hole 1031 is opened, oil and gas can enter the second chamber 105 through the gap between the first through-hole 1031 and the connecting rod 21. The first blocking portion 20 is larger than the first through-hole 1031. When the first blocking portion 20 abuts against the partition 103, the first through-hole 1031 is completely blocked. In some embodiments, the baffle 43, the first blocking portion 20, and the connecting rod 21 may be integrally formed.

[0054] In one embodiment, the second blocking portion 31 is formed by extending outward from one end of the main body portion 32 close to the partition 103, and the second through hole 1032 is arranged on the peripheral side of the first through hole 1031. Specifically, the second plate portion 311 of the second blocking portion 31 is formed by extending outward from one end of the main body portion 32 close to the partition 103. With such an arrangement, the second blocking portion 31 and the main body portion 32 can be integrally formed, which facilitates the production of the second blocking portion 31 and the main body portion 32, and can simplify the complexity of the internal structure of the shell 10 to a certain extent; the arrangement of the first through hole 1031 and the second through hole 1032 can achieve their coordination with the first blocking portion 20 and the second blocking portion 31, reducing the space occupied by the structure in the first cavity. In this embodiment, the first elastic member 41 can be offset against the second blocking portion 31.

[0055] In some embodiments, the number of second through holes 1032 can be multiple, and the multiple second through holes 1032 are spaced apart around the first through hole 1031. The number of second through holes 1032 can be, for example, six, five, etc. In other embodiments, the second through holes 1032 can be annular holes, arranged around the first through hole 1031.

[0056] In one embodiment, the first chamber 104 is further provided with a driving unit 60, which is connected to the moving unit 30; the driving unit 60 can drive the moving unit 30 to move away from the partition 103, thereby opening the second through hole 1032. By providing the driving unit 60, when refueling is required and the pressure in the fuel tank is less than a first threshold, the driving unit 60 can drive the moving unit 30 to move, thereby opening the second through hole 1032. The oil and gas in the fuel tank can then enter the oil and gas adsorption and desorption device through the second through hole 1032 and be adsorbed. This reduces the amount of oil and gas in the fuel tank that is transferred to the external air during refueling, helps reduce environmental pollution, and improves the utilization rate of the oil and gas.

[0057] In one embodiment, the driving portion 60 includes an electromagnetic coil 61, a first magnetic member 62, and a second magnetic member 63. The first magnetic member 62 is fixed in the electromagnetic coil 61, and the second magnetic member 63 is movably located in the electromagnetic coil 61 and connected to the moving portion 30. When the electromagnetic coil 61 is energized, the first magnetic member 62 generates a magnetic attraction force on the second magnetic member 63, driving the second magnetic member 63 and the moving portion 30 to move away from the partition 103. At this time, the fuel tank isolation valve 100 is in a state as shown in FIG. Figure 5 The third state is shown. When the electromagnetic coil 61 is de-energized, the magnetic attraction of the first magnetic member 62 to the second magnetic member 63 disappears. The first magnetic member 62 is located on the side of the second magnetic member 63 facing away from the partition 103, and the second magnetic member 63 is located on the side of the movable portion 30 facing away from the partition 103.

[0058] With this arrangement, when refueling the fuel tank, the electromagnetic coil 61 is energized, causing the second magnetic member 63 to drive the movable portion 30 away from the partition 103. This causes the second blocking portion 31 to move away from the partition 103, opening the second through-hole 1032. The fuel vapor in the fuel tank then enters the second chamber 105 through the second through-hole 1032 and is adsorbed by the fuel vapor adsorption and desorption device, preventing the fuel vapor from escaping and polluting the environment when the fuel tank cap is opened. In other words, the opening of the second through-hole 1032 can be controlled by turning the electromagnetic coil 61 on and off, facilitating operation.

[0059] In other embodiments, the driving portion 60 includes a motor that drives the moving portion 30 to move. The motor has two operating states. In the first operating state, the motor drives the moving portion 30 to move away from the partition 103, thereby opening the second through hole 1032. In the second operating state, the motor drives the moving portion 30 to move toward the partition 103, thereby causing the second blocking portion 31 to block the second through hole 1032. The second through hole 1032 can be opened or blocked by controlling the operating state of the motor, thereby facilitating operation.

[0060] In one embodiment, the first magnetic member 62 and the second magnetic member 63 are magnetizable in a magnetic field. Thus, when the electromagnetic coil is energized, the first magnetic member 62 exerts a magnetic attraction on the second magnetic member. When the electromagnetic coil is de-energized, the magnetic attraction of the first magnetic member 62 on the second magnetic member disappears. In some embodiments, the material of the first magnetic member 62 and the second magnetic member 63 may be iron.

[0061] In one example, when a first elastic member 41 is provided in the oil tank isolation valve, when the movable portion 30 moves in a direction away from the partition 103, the first elastic member 41 is compressed, the electromagnetic coil 61 is powered off, the magnetic attraction of the first magnetic member 62 to the second magnetic member 63 disappears, and the first elastic member 41 stretches, driving the movable portion 30 to move toward the direction close to the partition 103. The second blocking portion 31 blocks the second through hole 1032. At this time, refueling of the oil tank can be started to prevent oil and gas from entering the second chamber 105 through the second through hole 1032 during refueling and leaking.

[0062] In one embodiment, the second magnetic member 63 may be provided with a connecting rod portion 631 and an enlarged portion 632 disposed at the end of the connecting rod portion 631 at the end facing away from the first magnetic member 62. A receiving portion 33 is provided on the side of the main body 32 facing away from the partition 103. The wall of the receiving portion 33 includes an opening smaller than the size of the enlarged portion 632. The enlarged portion 632 is received within the receiving portion 33, and the connecting rod portion 631 is movable within the opening of the receiving portion 33. When the electromagnetic coil 61 is de-energized, when the movable portion 30 moves away from the partition 103, the connecting rod portion 631 remains stationary, while the movable portion 30 moves relative to the connecting rod portion 631 and the enlarged portion 632. When the electromagnetic coil 61 is energized, the second magnetic member 63 moves toward the first magnetic member 62, and the enlarged portion 632 abuts against the wall of the receiving portion 33, thereby causing the second magnetic member 63 to move along with the movable portion 30.

[0063] In one embodiment, the electromagnetic coil 61 includes an insulating tube 611 and a coil 612 wound around the insulating tube 611. The first magnetic member 62 and the second magnetic member 63 are located in the insulating tube 611.

[0064] In one embodiment, the first magnetic member 62 and the abutting portion 621 are integrally formed. This facilitates assembly of the first magnetic member 62 and the abutting portion 621. The abutting portion 621 abuts against the housing wall. An annular groove is formed on the side of the abutting portion 621, and an annular sealing ring 53 is disposed within the annular groove. The provision of the annular sealing ring 53 enhances the sealing performance of the first chamber 104, preventing leakage of oil and gas therein.

[0065] In one embodiment, the fuel tank isolation valve further includes a support portion located within the first chamber 104, one end of the support portion abutting against the abutting portion 621, and the other end abutting against the partition 103. The first magnetic member 62 and the abutting portion 621 are integrally structured, and the support portion can support the first magnetic member 62 to prevent it from moving.

[0066] In one embodiment, the housing 10 is assembled from a first housing portion 11, a second housing portion 12, and a third housing portion 13. The ends of the second housing portion 12 are connected to the first housing portion 11 and the third housing portion 13, respectively. The first housing portion 11 can be connected to the second housing portion 12 and the third housing portion 13 via snap fasteners. This facilitates assembly of the internal structure of the housing 10. The partition 103 can be disposed within the second housing portion 12, the first communication port 101 can be disposed on a sidewall of the second housing portion 12, and the second communication port 102 can be disposed on a wall of the first housing portion 11.

[0067] As can be seen from the foregoing, the fuel tank isolation valve 100 provided in the embodiment of the present application can perform three functions: releasing air to the oil-gas adsorption-desorption device when the internal fuel tank pressure exceeds a first threshold; replenishing air when the internal fuel tank pressure falls below a second threshold; and releasing air to the oil-gas adsorption-desorption device via the drive unit 60 when the internal fuel tank pressure falls below the first threshold and the fuel tank needs to be opened. Furthermore, compared to solutions that separately provide a solenoid valve, a release valve, and a replenishing valve, the fuel tank isolation valve 100 provided in the embodiment of the present application is compact, simple, and relatively small in size, making assembly relatively simple.

[0068] The present application also provides a fuel tank system. The fuel tank system includes a fuel tank, an oil-gas adsorption-desorption device, and the fuel tank isolation valve 100 described in any of the above embodiments. The fuel tank is connected to the first communication port 101 of the fuel tank isolation valve 100, and the oil-gas adsorption-desorption device is connected to the second communication port 102 of the fuel tank isolation valve 100.

[0069] In one embodiment, the oil and gas adsorption and desorption device is a carbon canister. The activated carbon in the carbon canister can adsorb oil and gas. After the engine is started, the oil and gas in the carbon canister can be sent into the engine together with fresh air and burned.

[0070] An embodiment of the present application also provides a vehicle, comprising the fuel tank system described in the above embodiment.

[0071] The above description is merely a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with this profession can make slight changes or modifications to equivalent embodiments with equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

[0072] The disclosure of this patent document contains material that is subject to copyright protection. The copyright is reserved by the copyright owner. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the official records and files of the Patent and Trademark Office.

Claims

1. A fuel tank isolation valve, characterized in that: The fuel tank isolation valve comprises: a housing, the housing being provided with a first communication port and a second communication port, the first communication port being used to connect to the oil tank, and the second communication port being used to connect to the oil-gas adsorption-desorption device; a partition being provided within the housing, the partition being used to separate the inner cavity of the housing into a first chamber and a second chamber; the first chamber being in communication with the first communication port, and the second chamber being in communication with the second communication port; the partition being provided with a first through hole and a second through hole; a first blocking portion, used for blocking the first through hole, located in the second cavity; a moving portion, located in the first chamber, the moving portion being provided with a second blocking portion for blocking the second through hole; When the pressure of the oil and gas in the oil tank is greater than a first threshold, the oil and gas entering the first chamber pushes the first blocking portion to move away from the partition, thereby opening the first through hole; when the pressure in the oil tank is less than a second threshold, the external air entering the second chamber through the oil and gas adsorption and desorption device pushes the second blocking portion to move away from the partition, thereby opening the second through hole; The fuel tank isolation valve further includes a second elastic member, which is located in the first chamber. The fuel tank isolation valve further includes a baffle movably disposed in the first chamber, with one end of the second elastic member abutting against the baffle and the other end abutting against the partition; the first blocking portion is connected to the baffle; when the pressure of the oil and gas in the fuel tank is greater than the first threshold, the first blocking portion moves away from the partition, and the second elastic member is compressed; when the pressure of the oil and gas in the fuel tank is less than the first threshold, the second elastic member expands, driving the first blocking portion to abut against the partition, so that the first blocking portion blocks the first through hole; The movable portion includes an annular main body portion, a through hole is provided on the side of the main body portion, the baffle is movably arranged in the main body portion, and the second elastic member is accommodated in the main body portion; the second blocking portion is formed by extending outward from one end of the main body portion close to the partition, and the second through hole is arranged on the peripheral side of the first through hole; the number of the second through holes is multiple, and the multiple second through holes are arranged at intervals around the first through hole; or, the second through hole is an annular hole surrounding the first through hole.

2. The fuel tank isolation valve according to claim 1, characterized in that: The oil tank isolation valve further includes a supporting portion and a first elastic member; the supporting portion is fixed to the first chamber, the first elastic member is located in the first chamber, one end of the first elastic member is in contact with the supporting portion, and the other end is in contact with the moving portion; When the pressure in the oil tank is lower than the second threshold, the second blocking portion moves away from the partition, and the first elastic member is compressed; When the pressure in the oil tank is greater than the second threshold, the first elastic member stretches, driving the second blocking portion to abut against the partition, and the second blocking portion blocks the second through hole.

3. The fuel tank isolation valve according to claim 1, characterized in that: The first chamber is further provided with a driving portion, which is connected to the moving portion; the driving portion can drive the moving portion to move in a direction away from the partition, so that the second through hole is opened.

4. The fuel tank isolation valve according to claim 3, characterized in that: The driving unit includes a motor; or The driving portion includes an electromagnetic coil, a first magnetic member, and a second magnetic member. The first magnetic member is fixed in the electromagnetic coil, and the second magnetic member is movably located in the electromagnetic coil and connected to the moving portion. The first magnetic member and the second magnetic member are magnetic members that can be magnetized in a magnetic field. When the electromagnetic coil is energized, the first magnetic member generates a magnetic attraction force on the second magnetic member, driving the second magnetic member and the moving part to move in a direction away from the partition; when the electromagnetic coil is de-energized, the magnetic attraction force of the first magnetic member on the second magnetic member disappears.

5. The fuel tank isolation valve according to claim 4, characterized in that: The oil tank isolation valve further includes a supporting portion and a first elastic member; the supporting portion is fixed to the first chamber, one end of the first elastic member is in contact with the supporting portion, and the other end is in contact with the moving portion; When the driving part includes an electromagnetic coil, a first magnetic part and a second magnetic part, the first magnetic part and the supporting part are an integrated structure, the supporting part abuts against the wall of the shell, and an annular groove is provided on the side of the supporting part, and an annular sealing part is provided in the annular groove.

6. The fuel tank isolation valve according to claim 1, characterized in that: The first blocking portion includes a first plate portion and a first sealing structure located at least on the side of the first plate portion close to the partition; and / or the second blocking portion includes a second plate portion and a second sealing structure located at least on the side of the second plate portion close to the partition.

7. A fuel tank system, characterized in that: It comprises an oil tank, an oil and gas adsorption and desorption device, and an oil tank isolation valve according to any one of claims 1 to 6; The oil tank is connected to the first communication port of the oil tank isolation valve, and the oil and gas adsorption and desorption device is connected to the second communication port of the oil tank isolation valve.

8. A vehicle, characterized in that: Including the fuel tank system according to claim 7.

Images