Isolation valve, fuel system and vehicle

Abstract

The utility model provides an isolating valve, a fuel system and a vehicle. The isolating valve comprises a shell, an electromagnetic valve assembly, a first pressure assembly and a second pressure assembly. A mounting cavity is formed in the shell, and the electromagnetic valve assembly, the first pressure assembly and the second pressure assembly are all arranged in the mounting cavity; the first pressure assembly is provided with a first channel, the second pressure assembly is provided with a second channel, and the first channel is communicated with the second channel; the electromagnetic valve assembly comprises a valve rod, the axis of the valve rod, the axis of the first channel and the axis of the second channel are located on the same straight line, the first channel and the second channel communicate with the air channel to form an air channel structure in the isolation valve, and the air channel structure is simpler, smaller in bending degree and beneficial to reducing the risk that oil and gas impurities remain in the air channel; therefore, the service life of the isolating valve is prolonged. In addition, the first channel and the second channel are coaxially arranged, so that the overall size of the mounting cavity and the isolating valve can be reduced, and the isolating valve can be conveniently mounted and fixed in the vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel tank isolation valves, in particular to an isolation valve, a fuel system and a vehicle. Background Art

[0002] The fuel system of fuel vehicles and hybrid vehicles includes a fuel tank, a purification tank and an isolation valve. Gasoline is stored in the fuel tank, activated carbon is stored in the purification tank, and the isolation valve is installed between the fuel tank and the purification tank to control the connection between the fuel tank and the purification tank under different working conditions.

[0003] In the prior art, in order to facilitate the layout of various components in the isolation valve, a large number of chambers are provided in the isolation valve, which results in a relatively complex airway structure inside the isolation valve. When the isolation valve is used for a long time, it is easy to cause residual oil and gas impurities, affecting the service life of the isolation valve. At the same time, it also causes the overall size of the isolation valve to be relatively large, which makes it inconvenient to install and fix the isolation valve on the vehicle. Utility Model Content

[0004] In view of this, the utility model provides an isolation valve, a fuel system and a vehicle, so as to at least solve the problems in the prior art that the internal airway structure of the isolation valve is complex, which easily causes impurities to remain, and the isolation valve is large in size and inconvenient to install.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] The utility model provides an isolation valve, comprising a housing, a solenoid valve assembly, a first pressure assembly and a second pressure assembly;

[0007] An installation cavity is provided in the housing, and the solenoid valve assembly, the first pressure assembly and the second pressure assembly are all arranged in the installation cavity;

[0008] The first pressure component is provided with a first channel, the second pressure component is provided with a second channel, and the first channel and the second channel are connected to each other;

[0009] The solenoid valve assembly includes a valve stem, and axes of the valve stem, the first channel, and the second channel are located on the same straight line.

[0010] Optionally, a first air duct for connecting to the fuel tank and a second air duct for connecting to the purification tank are further provided in the shell, the first air duct and the second air duct are provided on both sides of the installation cavity, the first air duct is connected to the first channel or the second channel, and the second air duct is connected to the second channel.

[0011] Optionally, the housing includes a first abutment portion and a second abutment portion disposed in the mounting cavity;

[0012] The first abutting portion is used to abut and seal with or separate from the first pressure component to control the communication state between the first airway and the first channel;

[0013] The second abutting portion is used to abut and seal with or separate from the second pressure component to control the communication state between the first air channel and the second channel.

[0014] Optionally, the first pressure assembly includes a first seat body and a first sealing member;

[0015] The first sealing member is connected to a side of the first seat body close to the solenoid valve, the first seat body is provided with a first through hole, the first sealing member is provided with a second through hole, and the first through hole is connected with the second through hole to form the first channel;

[0016] The first sealing member is provided with a first sealing portion and a second sealing portion. The first sealing portion is used for abutting and sealing with the solenoid valve, and the second sealing portion is used for abutting and sealing with the first abutting portion.

[0017] Optionally, the first sealing portion protrudes from the surface of the first sealing member in a direction approaching the solenoid valve assembly, and the second sealing portion protrudes from the surface of the first sealing member in a direction approaching the second pressure assembly.

[0018] Optionally, the first seat body and the first sealing member are an integral piece.

[0019] Optionally, the first pressure assembly further includes a first spring;

[0020] At least a portion of the first spring is disposed in the first channel, one end of the first spring is connected to the first sealing member, and the other end of the first spring is connected to the housing.

[0021] Optionally, the second pressure assembly includes a second seat body and a second sealing member;

[0022] The second sealing member is connected to a side of the second seat body close to the first pressure assembly, the second seat body is provided with a third through hole, the second sealing member is provided with a fourth through hole, and the third through hole is connected with the fourth through hole to form the second channel;

[0023] The second sealing member is provided with a third sealing portion, and the third sealing portion is used for abutting and sealing with the second abutting portion.

[0024] Optionally, the third sealing portion protrudes from the surface of the second sealing member in a direction approaching the first pressure assembly.

[0025] Optionally, the second seat body and the second sealing member are an integral piece.

[0026] Optionally, the second pressure assembly further includes a second spring;

[0027] The second spring is arranged on a side of the second seat body away from the first pressure assembly. One end of the second spring is connected to the second sealing member, and the other end of the second spring is connected to the housing.

[0028] Optionally, the second abutting portion is provided with an air hole penetrating the second abutting portion along the axial direction of the second channel.

[0029] Optionally, the solenoid valve assembly further comprises a valve housing, a coil assembly, an iron core, a third spring and a valve seat;

[0030] The coil assembly is arranged in the valve housing, and the coil assembly is arranged around the circumference of the iron core;

[0031] A fourth channel is provided in the iron core, and the valve stem can be movably inserted into the fourth channel;

[0032] The valve seat is connected to a side of the valve housing close to the first pressure assembly through the third spring, and the end of the valve stem is movably arranged in the valve seat.

[0033] The utility model also provides a fuel system, comprising a fuel tank, a purification tank and any one of the aforementioned isolation valves, wherein the isolation valve is connected between the fuel tank and the purification tank.

[0034] The utility model provides a vehicle, comprising the above-mentioned fuel system.

[0035] Compared with the prior art, the isolation valve, fuel system and vehicle described in the utility model have the following advantages:

[0036] In the isolation valve of the utility model, the axis of the valve stem in the solenoid valve assembly, the axis of the first channel in the first pressure assembly, and the axis of the second channel in the second pressure assembly are all located on the same straight line, so that the first channel and the second channel can jointly form a channel arranged along the axial direction thereof, and the channel is connected with the airway to form an airway structure inside the isolation valve. Compared with the airway structure of the isolation valve in the prior art, the airway structure is simpler in structure and less tortuous, which helps to reduce the risk of residual oil and gas impurities in the airway of the isolation valve in the case of long-term use, thereby extending the service life of the isolation valve. In addition, the coaxial arrangement of the first channel and the second channel improves the coaxiality of the solenoid valve assembly, the first pressure assembly, and the second pressure assembly in the installation cavity to a certain extent, thereby helping to reduce the volume of the installation cavity, further reducing the overall volume of the isolation valve, and facilitating the installation and fixation of the isolation valve in the vehicle.

[0037] The fuel system and vehicle of the present invention have the same or similar advantages as the prior art and the aforementioned isolation valve, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0039] Figure 1 This is a structural explosion diagram of an isolation valve in an embodiment of the utility model;

[0040] Figure 2 It is a cross-sectional schematic diagram of an isolation valve in an embodiment of the utility model;

[0041] Figure 3 yes Figure 2 A partial enlarged view of

[0042] Figure 4 is a schematic diagram of a first pressure component in an embodiment of the utility model;

[0043] Figure 5 is a schematic diagram of a second pressure component in an embodiment of the utility model;

[0044] Figure 6 It is a cross-sectional schematic diagram of a solenoid valve assembly in an embodiment of the utility model;

[0045] Figure 7 It is a schematic diagram of an isolation valve in a pressure relief mode in an embodiment of the utility model;

[0046] Figure 8 It is a schematic diagram of an isolation valve in a pressure replenishing mode in an embodiment of the utility model;

[0047] Fig. 9 It is a schematic diagram of an isolation valve in a pressure reduction mode in an embodiment of the utility model;

[0048] Fig.10 It is a schematic diagram of another isolation valve in the embodiment of the utility model in the pressure reduction mode.

[0049] Description of reference numerals:

[0050] 1-shell, 10-installation cavity, 11-first air channel, 12-second air channel, 13-base, 101-first abutment portion, 102-second abutment portion, 2-solenoid valve assembly, 21-valve stem, 22-valve housing, 23-coil assembly, 24-iron core, 241-static iron core, 242-moving iron core, 25-third spring, 26-valve seat, 3-first pressure assembly, 30-first channel, 31-first seat body, 310-first through hole, 32-first sealing member, 320-second through hole, 321-first sealing portion, 322-second sealing portion, 33-first spring, 4-second pressure assembly, 40-second channel, 41-second seat body, 410-third through hole, 42-second sealing member, 420-fourth through hole, 421-third sealing portion, 43-second spring. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0052] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the utility model can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0053] It should be understood that the reference to "some embodiments" throughout the specification means that specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the utility model. Therefore, the "in some embodiments" appearing in various places throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0054] The following describes in detail an isolation valve, a fuel system and a vehicle provided by the utility model by listing specific embodiments.

[0055] Reference Figures 1 to 6The utility model embodiment provides an isolation valve, including a shell 1, a solenoid valve assembly 2, a first pressure assembly 3 and a second pressure assembly 4; the shell 1 is provided with a mounting cavity 10, the solenoid valve assembly 2, the first pressure assembly 3 and the second pressure assembly 4 are all arranged in the mounting cavity 10; the first pressure assembly 3 is provided with a first channel 30, the second pressure assembly 4 is provided with a second channel 40, and the first channel 30 and the second channel 40 are interconnected; the solenoid valve assembly 2 includes a valve stem 21, and the axes of the valve stem 21, the first channel 30 and the second channel 40 are located on the same straight line.

[0056] Specifically, if Figure 1 and Figure 2 As shown, the isolation valve includes a housing 1, a solenoid valve assembly 2, a first pressure assembly 3 and a second pressure assembly 4. An air passage and a mounting cavity 10 are provided in the housing 1. The air passage is used to connect the fuel tank and the purge tank to achieve air pressure regulation between the fuel tank and the purge tank. The solenoid valve assembly 2, the first pressure assembly 3 and the second pressure assembly 4 are all installed in the mounting cavity 10, wherein the first pressure assembly 3 and the second pressure assembly 4 are all located in the mounting cavity 10, and the first pressure assembly 3 is located on the upper side of the second pressure assembly 4, that is, the first pressure assembly 3 is located between the solenoid valve assembly 2 and the second pressure assembly 4. Figure 6 As shown, the solenoid valve assembly 2 includes a valve stem 21, a valve seat 26, a valve housing 22, a coil assembly 23 and an iron core 24, wherein parts of the valve stem 21 and the iron core 24 are located in the installation cavity 10, the valve seat 26 is entirely located in the installation cavity 10, and the valve housing 22 and the coil assembly 23 are located outside the installation cavity 10.

[0057] like Figure 3 As shown, the first pressure assembly 3 is provided with a first channel 30, and the second pressure assembly 4 is provided with a second channel 40. The first channel 30 and the second channel 40 are interconnected. The valve stem 21 in the solenoid valve assembly 2 moves toward or away from the first pressure assembly 3 under the action of the coil assembly 23, so that the valve seat 26 abuts against the first pressure assembly 3 to seal or separate. At the same time, under the action of the pressure in the fuel tank and the purification tank, the first pressure assembly 3 and the second pressure assembly 4 abut against the housing 1 to seal or separate, thereby changing the communication relationship and communication position between the first channel 30, the second channel 40 and the airway, and realizing the regulation of the pressure in the fuel tank and the purification tank under different working conditions. The isolation valve usually includes three working modes: pressure relief, pressure replenishment, and pressure reduction, so as to match the three different working conditions during the use of the fuel tank. The communication relationship and communication position between the first channel 30, the second channel 40 and the airway are different, so that the isolation valve can be in different working modes.

[0058] The axis of the valve stem 21 in the solenoid valve assembly 2, the axis of the first channel 30 in the first pressure assembly 3, and the axis of the second channel 40 in the second pressure assembly 4 are all located on the same straight line, so that the first channel 30 and the second channel 40 can jointly form a channel arranged along the axial direction thereof, and the channel is connected with the airway to form an airway structure inside the isolation valve. Compared with the airway structure of the isolation valve in the prior art, the airway structure is simpler in structure and less tortuous, which helps to reduce the risk of residual oil and gas impurities in the airway of the isolation valve in the case of long-term use, thereby extending the service life of the isolation valve. In addition, the coaxial arrangement of the first channel 30 and the second channel 40 improves the coaxiality of the solenoid valve assembly 2, the first pressure assembly 3, and the second pressure assembly 4 in the installation cavity 10 to a certain extent, thereby helping to reduce the volume of the installation cavity 10, further reducing the overall volume of the isolation valve, and facilitating the installation and fixation of the isolation valve in the vehicle.

[0059] Optionally, refer to Figure 2 and Figure 3 The shell 1 is also provided with a first air channel 11 for connecting to the fuel tank and a second air channel 12 for connecting to the purification tank. The first air channel 11 and the second air channel 12 are arranged on both sides of the installation cavity 10. The first air channel 11 is connected to the first channel 30 or the second channel 40, and the second air channel 12 is connected to the second channel 40.

[0060] Specifically, if Figure 2 and Figure 3 As shown, the air passage in the housing 1 includes a first air passage 11 and a second air passage 12. The first air passage 11 is used to communicate with the fuel tank in the vehicle, and the second air passage 12 is used to communicate with the purification tank in the vehicle. The fuel tank is an oil tank, which is used to store gasoline for the vehicle engine. The purification tank is usually a carbon canister, and a large amount of activated carbon is arranged inside the tank body, which can absorb and store the oil and gas vapor discharged from the fuel tank. The first air passage 11 and the second air passage 12 are arranged on both sides of the installation cavity 10. The first air passage 11 is connected to the first channel 30 at some times and to the second channel 40 at some times. The second air passage 12 is always connected to the second channel 40, so as to be suitable for adjusting the gas pressure in the fuel tank and the purification tank under different working conditions.

[0061] Optionally, refer to Figure 3 The shell 1 includes a first abutting portion 101 and a second abutting portion 102 arranged in the installation cavity 10; the first abutting portion 101 is used to abut and seal or separate with the first pressure component 3 to control the connection state between the first airway 11 and the first channel 30; the second abutting portion 102 is used to abut and seal or separate with the second pressure component 4 to control the connection state between the first airway 11 and the second channel 40.

[0062] Specifically, the first abutment portion 101 is arranged at a position close to the first pressure component 3 and is located on a side close to the first air channel 11. The first abutment portion 101 is used to abut and seal or separate with the first pressure component 3. When the first abutment portion 101 abuts and seals with the first pressure component 3, the gas in the first air channel 11 cannot flow from the abutment portion to the first channel 30, and at this time, the first air channel 11 and the first channel 30 are not connected; when the first abutment portion 101 is separated from the first pressure component 3, the gas in the first air channel 11 can flow from the abutment portion to the first channel 30, and at this time, the first air channel 11 and the first channel 30 are connected to each other. The second abutting portion 102 is provided at a position close to the second pressure assembly 4. The second abutting portion 102 is used to abut and seal with or separate from the second pressure assembly 4. When the second abutting portion 102 abuts and seals with the second pressure assembly 4, the gas in the first gas channel 11 cannot flow from the abutting portion to the second channel 40, and the first gas channel 11 and the second channel 40 are not connected. When the second abutting portion 102 is separated from the second pressure assembly 4, the gas in the first gas channel 11 can flow from the abutting portion to the second channel 40, and the first gas channel 11 and the second channel 40 are connected to each other. Based on the interconnected state between the first gas channel 11, the first channel 30, and the second channel 40, the gas pressure in the fuel tank and the purification tank can be adjusted under different working conditions.

[0063] Optionally, refer to Figure 3 and Figure 4 The first pressure assembly 3 includes a first seat body 31 and a first sealing member 32; the first sealing member 32 is connected to a side of the first seat body 31 close to the solenoid valve, a first through hole 310 is provided on the first seat body 31, and a second through hole 320 is provided on the first sealing member 32. The first through hole 310 is connected to the second through hole 320 to form the first channel 30; the first sealing member 32 is provided with a first sealing portion 321 and a second sealing portion 322, the first sealing portion 321 is used for abutting and sealing with the solenoid valve, and the second sealing portion 322 is used for abutting and sealing with the first abutting portion 101.

[0064] Specifically, if Figure 4 As shown, the first pressure assembly 3 includes a first seat body 31 and a first sealing member 32. The first seat body 31 is a columnar structure, and its specific structural shape includes but is not limited to a cylindrical structure, a square columnar structure, a prismatic structure, etc., which is not limited by the embodiment of the utility model. A first through hole 310 is provided on the first seat body 31, and the first through hole 310 is used to circulate the gas between the fuel tank and the purification tank. The first seat body 31 has an outer peripheral surface arranged around its axial direction. In order to increase the gas circulation capacity of the first through hole 310, a hollow area can be opened on the outer peripheral surface of the first seat body 31, and the hollow area is connected to the first through hole 310, and both can circulate gas.

[0065] like Figure 3 As shown, the first sealing member 32 is connected to the side of the first seat body 31 close to the solenoid valve. The first sealing member 32 is made of rubber, silicone, soft plastic and other materials. The first sealing member 32 can be fixedly connected to the first seat body 31 by crimping, gluing, assembling and other methods. Figure 4 As shown, the first sealing member 32 is provided with a second through hole 320, which is also used to circulate the gas between the fuel tank and the purification tank. The second through hole 320 is connected with the first through hole 310 to form the first channel 30 mentioned in the above embodiment. The apertures of the first through hole 310 and the second through hole 320 can be the same or different. In the embodiment of the utility model, the aperture of the first through hole 310 is set to be larger than the aperture of the second through hole 320 to ensure that the connection area between the first seat body 31 and the first sealing member 32 is sufficient, thereby ensuring the connection reliability between the first seat body 31 and the first sealing member 32. At the same time, the aperture of the first through hole 310 is larger than the aperture of the second through hole 320, which also helps to reduce the probability of air leakage of the first sealing member 32. Improve the sealing effect of the first sealing member 32.

[0066] like Figure 3 As shown, the first sealing member 32 is provided with a first sealing portion 321 and a second sealing portion 322, and the sealing function of the first sealing member 32 is mainly realized by the first sealing portion 321 and the second sealing portion 322. The first sealing portion 321 is used for abutting and sealing with the valve seat 26 of the solenoid valve assembly 2, and the second sealing portion 322 is used for abutting and sealing with the first abutting portion 101 on the housing 1. When the first sealing portion 321 abuts and seals with the valve seat 26 of the solenoid valve assembly 2, and the second sealing portion 322 abuts and seals with the first abutting portion 101, the gas in the first gas passage 11 cannot enter the first channel 30 from the first through hole 310, and the gas in the first channel 30 cannot flow out from the first through hole 310. On the contrary, when the first sealing portion 321 is separated from the valve seat 26 of the solenoid valve assembly 2, or the second sealing portion 322 is separated from the first abutting portion 101, or when the first sealing portion 321 is separated from the valve seat 26 of the solenoid valve assembly 2 and the second sealing portion 322 is separated from the first abutting portion 101, the gas in the first airway 11 can flow from the first through hole 310 to the first channel 30, and the gas in the first channel 30 can also flow out from the first through hole 310.

[0067] Optionally, refer to Figure 3 and Figure 4 The first sealing portion 321 protrudes from the surface of the first sealing member 32 along a direction approaching the solenoid valve assembly 2 , and the second sealing portion 322 protrudes from the surface of the first sealing member 32 along a direction approaching the second pressure assembly 4 .

[0068] Specifically, the direction in which the first sealing portion 321 approaches the solenoid valve assembly 2 is the same as the direction in which the first sealing portion 321 approaches the first abutting portion 101. Along this direction, the first sealing portion 321 protrudes from the surface of the first sealing member 32, so that the surface of the first sealing member 32 on the side close to the first abutting portion 101 is an uneven structure, which helps to improve the elastic deformation capacity of the first sealing portion 321, thereby helping to improve the abutment and sealing effect between the first sealing portion 321 and the valve seat 26, and avoid gas leakage. Similarly, the second sealing portion 322 protrudes from the surface of the first sealing member 32 along the direction close to the second pressure assembly 4, so that the surface of the first sealing member 32 on the side close to the second pressure assembly 4 is also an uneven structure, thereby improving the elastic deformation capacity of the second sealing portion 322, improving the abutment and sealing effect between the second sealing portion 322 and the first abutting portion 101, and avoiding gas leakage. In addition, the first sealing member 32 and the first sealing portion 321 and the second sealing portion 322 are thicker in the embodiment of the utility model to ensure the durability of the first sealing member 32 and the elastic deformation capability of the first sealing portion 321 and the second sealing portion 322. Furthermore, since the first seat body 31 is a columnar structure, the first sealing member 32 only seals the upper portion of the first seat body 31. To avoid air leakage between the lower portion of the first seat body 31 and the housing 1, a sealing member can also be provided at the lower portion of the second seat body 41. The sealing member is sealed against the housing 1 to ensure the sealing effect of the first channel 30.

[0069] Optionally, the first seat body 31 and the first sealing member 32 are an integrated member.

[0070] Specifically, the first seat body 31 can be made of hard plastic, such as polypropylene polymer of grade 6 or above, and the first seal 32 is made of silicone, rubber and other materials. Subsequently, the first seat body 31 and the first seal 32 are processed into an integrated structure by injection molding, thereby ensuring the connection reliability of the first seat body 31 and the first seal 32.

[0071] Optionally, refer to Figure 3 and Figure 4 The first pressure assembly 3 also includes a first spring 33; at least a portion of the first spring 33 is disposed in the first channel 30, one end of the first spring 33 is connected to the first sealing member 32, and the other end is connected to the housing 1.

[0072] Specifically, at least part of the first spring 33 is arranged in the first channel 30 formed by the first through hole 310 and the second through hole 320. The aperture of the first through hole 310 is larger than the aperture of the second through hole 320 on the first seal 32, so that along the axis direction of the first channel 30, at least part of the projection of the first seal 32 is located in the first through hole 310. The end of the first spring 33 close to the first seal 32 is connected to the first seal 32, and the end of the first spring 33 away from the first seal 32 is connected to the housing 1 of the isolation valve. The connection form includes but is not limited to abutment, assembly connection, adhesive connection, etc., which is not limited to the embodiment of the utility model. The first spring 33 is a compression spring. The first spring 33 can push the first seal 32 and the first seat body 31 to move along the axis direction of the first channel 30 toward the side close to the solenoid valve assembly 2 under the action of its own elastic deformation, so that the second sealing portion 322 of the first seal 32 is separated from the first abutment portion 101, and the first channel 30 is connected with the first airway 11. Of course, the pressure in the solenoid valve assembly 2 or the fuel tank can also push the first sealing member 32 and the first seat body 31 to move along the axial direction of the first channel 30 toward the side close to the second pressure assembly 4, thereby compressing the first spring 33, and the second sealing portion 322 of the first sealing member 32 abuts against and seals with the first abutting portion 101. If at this time the first sealing portion 321 of the first sealing member 32 and the solenoid valve assembly 2 are also in a state of abutting and sealing, the first channel 30 and the first air duct 11 cannot be connected.

[0073] Optionally, refer to Figure 3 and Figure 5 The second pressure assembly 4 includes a second seat body 41 and a second sealing member 42; the second sealing member 42 is connected to a side of the second seat body 41 close to the first pressure assembly 3, a third through hole 410 is provided on the second seat body 41, and a fourth through hole 420 is provided on the second sealing member 42, and the third through hole 410 is connected with the fourth through hole 420 to form the second channel 40; a third sealing portion 421 is provided on the second sealing member 42, and the third sealing portion 421 is used to abut and seal with the second abutting portion 102.

[0074] Specifically, the second pressure assembly 4 includes a second seat body 41 and a second sealing member 42. The second seat body 41 is a disc-shaped structure. The second sealing member 42 is connected to a side of the second seat body 41 close to the first pressure assembly 3. The second seat body 41 is provided with a third through hole 410 for circulating gas between the fuel tank and the purification tank. The second sealing member 42 is provided with a fourth through hole 420 for circulating gas between the fuel tank and the purification tank. The third through hole 410 and the fourth through hole 420 are connected to form the second channel 40 described in the above embodiment. The apertures of the third through hole 410 and the fourth through hole 420 can be the same or different. In the embodiment of the utility model, the aperture of the third through hole 410 is set to be larger than the aperture of the fourth through hole 420 to ensure that the connection area between the second seat body 41 and the second sealing member 42 is sufficient, thereby ensuring the connection reliability between the second seat body 41 and the second sealing member 42. At the same time, the aperture of the third through hole 410 is larger than the aperture of the fourth through hole 420, which also helps to reduce the probability of gas leakage of the second sealing member 42. The sealing effect of the second sealing member 42 is improved.

[0075] The second sealing member 42 is provided with a third sealing portion 421, and the sealing function of the second sealing member 42 is mainly realized by the third sealing portion 421. The third sealing portion 421 is used to abut and seal or separate with the second abutting portion 102 on the housing 1. When the third sealing portion 421 abuts and seals with the second abutting portion 102, the gas in the first air channel 11 cannot enter the second channel 40 from the fourth through hole 420. When the third sealing portion 421 is separated from the second abutting portion 102, the gas in the first air channel 11 can enter the second channel 40 from the fourth through hole 420. In the embodiment of the utility model, an air hole is provided on the second abutting portion 102, which penetrates the second abutting portion 102 along the axial direction of the second channel 40. When the third sealing portion 421 is separated from the second abutting portion 102, the gas in the first air channel 11 can flow into the second channel 40 from the air hole. The number of air holes can be one, two or more. In order to ensure the ventilation capacity of the air holes, when the number of air holes is small, the area of ​​the air holes can be set to be larger. Exemplarily, a plurality of air holes with similar areas may be provided, and the plurality of air holes are evenly distributed on the second abutting portion 102 to ensure uniform and efficient ventilation of the air holes.

[0076] Optionally, refer to Figure 3 and Figure 5 The third sealing portion 421 protrudes from the surface of the second sealing member 42 along a direction approaching the first pressure assembly 3 .

[0077] Specifically, the direction in which the third sealing portion 421 approaches the first pressure assembly 3 is the same as the direction in which the third sealing portion 421 approaches the second abutting portion 102. Along this direction, the third sealing portion 421 protrudes from the surface of the second sealing member 42, so that the surface of the second sealing member 42 on the side close to the second abutting portion 102 is an uneven structure, which helps to improve the elastic deformation ability of the third sealing portion 421, thereby helping to improve the abutment sealing effect of the third sealing portion 421 and the second abutting portion 102, and avoid gas leakage. In addition, the embodiment of the utility model sets the second sealing member 42 and the third sealing portion 421 to be thicker to ensure the durability of the second sealing member 42 and the elastic deformation ability of the third sealing portion 421.

[0078] Optionally, the second seat body 41 and the second sealing member 42 are an integral piece.

[0079] Specifically, the second seat body 41 can be made of hard plastic, such as polypropylene polymer of grade 6 or above, and the second seal 42 is made of silicone, rubber and other materials. Subsequently, the second seat body 41 and the second seal 42 are processed into an integrated structure by injection molding, thereby ensuring the connection reliability of the second seat body 41 and the second seal 42.

[0080] Optionally, refer to Figure 3 and Figure 5 The second pressure assembly 4 also includes a second spring 43; the second spring 43 is arranged on the side of the second seat body 41 away from the first pressure assembly 3, one end of the second spring 43 is connected to the second sealing member 42, and the other end is connected to the housing 1.

[0081] Specifically, the second spring 43 is arranged on the side of the second seat body 41 away from the first pressure assembly 3, one end of the second spring 43 is connected to the second sealing member 42, and the other end is connected to the base 13 of the housing 1. The connection forms include but are not limited to abutment, assembly connection, adhesive connection, etc., which are not limited to the embodiments of the utility model. The second spring 43 is a compression spring. The second spring 43 can push the second seat body 41, that is, the second sealing member 42, to move along the axis direction of the second channel 40 to the side close to the first pressure assembly 3 under the action of its own elastic deformation, so that the third sealing portion 421 and the second abutting portion 102 are abutted and sealed. Under the action of the pressure in the fuel tank, the second seat body 41, that is, the second sealing member 42, can be pushed to move along the axis direction of the second channel 40 to the side away from the first pressure assembly 3, so that the second spring 43 is compressed, the third sealing portion 421 is separated from the second abutting portion 102, and the gas in the first air channel 11 can flow into the second channel 40 through the air hole.

[0082] Optionally, refer to Figure 2 and Figure 6 The solenoid valve assembly 2 also includes a valve housing 22, a coil assembly 23, an iron core 24, a third spring 25 and a valve seat 26; the coil assembly 23 is arranged in the valve housing 22, and the coil assembly 23 is arranged around the circumference of the iron core 24; a fourth channel is provided in the iron core 24, and the valve stem 21 can be movably inserted into the fourth channel; the valve seat 26 is connected to the side of the valve housing 22 close to the first pressure assembly 3 through the third spring 25, and the end of the valve stem 21 can be movably inserted into the valve seat 26.

[0083] Specifically, the iron core 24 includes a static iron core 241 and a moving iron core 242. The moving iron core 242 is arranged in the static iron core 241. The coil assembly 23 is arranged around the circumference of the static iron core 241. After the coil assembly 23 is energized, the moving iron core 242 can move in the static iron core 241 along the axis direction of the valve stem 21 under the action of the changing magnetic field. The moving iron core 242 and the static iron core 241 together form a fourth channel. The fourth channel is arranged along the axis direction of the valve stem 21. The valve stem 21 is penetrated in the fourth channel and is gap-matched with the first channel 30, so that the valve stem 21 can move relative to the fourth channel along the axis direction of the valve stem 21. The movement of the valve stem 21 in the fourth channel also helps to improve the coaxiality of the moving iron core 242 relative to the static iron core 241. The third spring 25 is connected to a side of the valve housing 22 close to the first pressure assembly 3. One end of the third spring 25 is connected to the valve housing 22, and the other end is connected to the valve seat 26. The end of the valve stem 21 is inserted into the valve seat 26 and has a clearance fit with the valve seat 26, so that the valve stem 21 can move relative to the valve seat 26 along the axial direction of the valve stem 21. At the same time, the valve seat 26 can achieve abutment sealing or separation with the first sealing portion 321 under the action of the valve stem 21 and the third spring 25.

[0084] Reference Figures 7 to 10 In combination with the above embodiments, the three working modes of the isolation valve in the embodiment of the utility model are exemplarily described:

[0085] Pressure relief mode: When the pressure in the fuel tank is too high, such as when the engine is turned off, the pressure relief mode of the isolation valve is turned on. Figure 7As shown, in this mode, the first sealing portion 321 of the first sealing member 32 in the first pressure assembly 3 abuts and seals with the valve seat 26 of the solenoid valve assembly 2, and the second sealing portion 322 of the first sealing member 32 abuts and seals with the first abutting portion 101 of the shell 1. At this time, the first air channel 11 is not connected to the first channel 30; under the action of the positive pressure of the fuel tank, the third sealing portion 421 of the second sealing member 42 in the second pressure assembly 4 is separated from the second abutting portion 102 of the shell 1, so that the gas in the first air channel 11 can enter the second channel 40 through the air hole on the second abutting portion 102; the second channel 40 and the second air channel 12 are always in a connected state, so that the gasoline vapor in the fuel tank can pass through the first air channel 11, the second channel 40 and the second air channel 12 in the direction indicated by the arrow in the figure and finally enter the purification tank and be stored in the purification tank, so as to prevent the gasoline vapor from emitting into the atmosphere and causing environmental pollution.

[0086] Pressure replenishment mode: When the pressure in the fuel tank is too low, such as when the engine is started, the pressure replenishment mode of the isolation valve is turned on. Figure 8 As shown, in this mode, the first sealing portion 321 of the first sealing member 32 in the first pressure assembly 3 and the valve seat 26 of the solenoid valve assembly 2 still maintain a state of abutment and sealing, but under the action of the negative pressure of the fuel tank, the second sealing portion 322 of the first sealing member 32 is separated from the first abutment portion 101 of the shell 1, and the first air passage 11 is connected with the first channel 30; at the same time, under the action of the negative pressure of the fuel tank, the third sealing portion 421 of the second sealing member 42 in the second pressure assembly 4 is abutted and sealed with the second abutment portion 102 of the shell 1, so that the gasoline vapor in the purification tank can pass through the second air passage 12, the second channel 40, the first channel 30, and the first air passage 11 in the direction indicated by the arrow in the figure and finally enter the fuel tank to replenish the fuel tank.

[0087] Pressure reduction mode: When the pressure in the fuel tank is relatively high but not so high as to cause the third sealing portion 421 of the second sealing member 42 in the second pressure assembly 4 to separate from the second abutting portion 102 of the housing 1, such as when refueling the fuel tank, the pressure reduction mode of the isolation valve is turned on. In this mode, the isolation valve includes two working states: Fig. 9 As shown, in the first working state, the solenoid valve assembly 2 works to separate the valve seat 26 from the first sealing portion 321 of the first sealing member 32 in the first pressure assembly 3, and at this time, the second sealing portion 322 of the first sealing member 32 and the first abutting portion 101 of the housing 1 still maintain an abutting and sealing state, so that the gasoline vapor in the fuel tank can pass through the first air passage 11, the first channel 30, the second channel 40 and the second air passage 12 in the direction indicated by the arrow in the figure and finally enter the purification tank, thereby reducing the pressure of the fuel tank. Fig.10As shown, when the pressure in the fuel tank is relatively low, in the second working state, the first sealing member 32 in the first pressure assembly 3, under the action of the first spring 33, still keeps the first sealing portion 321 and the valve seat 26 in the solenoid valve assembly 2 in an abutting and sealing state, while the second sealing portion 322 of the first sealing member 32 is separated from the first abutting portion 101 of the shell 1, so that the gasoline vapor in the fuel tank can pass through the first air passage 11, the first channel 30, the second channel 40 and the second air passage 12 in the direction indicated by the arrow in the figure and finally enter the purification tank, thereby reducing the pressure of the fuel tank.

[0088] The utility model also provides a fuel system, comprising a fuel tank, a purification tank and the isolation valve described in any one of the above items, wherein the isolation valve is connected between the fuel tank and the purification tank.

[0089] Specifically, the fuel system includes a fuel tank, a purification tank and an isolation valve of any of the aforementioned embodiments. The isolation valve is connected between the fuel tank and the purification tank. The air passage structure inside the isolation valve is simple and is not prone to residual oil and gas impurities. At the same time, the overall volume of the isolation valve is small, which helps to improve the reliability of the fuel system and reduce the design difficulty of the fuel system.

[0090] The utility model also provides a vehicle, comprising the above-mentioned fuel system.

[0091] Specifically, the vehicle may be a fuel vehicle or a hybrid vehicle. The vehicle includes the aforementioned fuel system, which helps to simplify the internal structural design of the vehicle, improve the safety performance of the vehicle, and also help to achieve a lightweight design of the vehicle.

[0092] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An isolation valve, characterized in that: It includes a housing, a solenoid valve assembly, a first pressure assembly and a second pressure assembly; An installation cavity is provided in the housing, and the solenoid valve assembly, the first pressure assembly and the second pressure assembly are all arranged in the installation cavity; The first pressure component is provided with a first channel, the second pressure component is provided with a second channel, and the first channel and the second channel are communicated with each other; The solenoid valve assembly includes a valve stem, and axes of the valve stem, the first channel, and the second channel are located on the same straight line.

2. The isolation valve according to claim 1, characterized in that The shell is also provided with a first air channel for connecting to the fuel tank and a second air channel for connecting to the purification tank. The first air channel and the second air channel are arranged on both sides of the installation cavity. The first air channel is connected to the first channel or the second channel, and the second air channel is connected to the second channel.

3. The isolation valve according to claim 2, characterized in that The housing comprises a first abutment portion and a second abutment portion disposed in the mounting cavity; The first abutting portion is used to abut and seal with or separate from the first pressure component to control the communication state between the first airway and the first channel; The second abutting portion is used to abut and seal with or separate from the second pressure component to control the communication state between the first air channel and the second channel.

4. The isolation valve according to claim 3, characterized in that The first pressure assembly includes a first seat body and a first sealing member; The first sealing member is connected to a side of the first seat body close to the solenoid valve, the first seat body is provided with a first through hole, the first sealing member is provided with a second through hole, and the first through hole is connected with the second through hole to form the first channel; The first sealing member is provided with a first sealing portion and a second sealing portion. The first sealing portion is used for abutting and sealing with the solenoid valve, and the second sealing portion is used for abutting and sealing with the first abutting portion.

5. The isolation valve according to claim 4, characterized in that The first sealing portion protrudes from the surface of the first sealing member in a direction approaching the solenoid valve assembly, and the second sealing portion protrudes from the surface of the first sealing member in a direction approaching the second pressure assembly.

6. The isolation valve according to claim 4, characterized in that The first seat body and the first sealing member are an integral part.

7. The isolation valve according to claim 4, characterized in that The first pressure assembly also includes a first spring; At least a portion of the first spring is disposed in the first channel, one end of the first spring is connected to the first sealing member, and the other end of the first spring is connected to the housing.

8. The isolation valve according to claim 3, characterized in that The second pressure assembly includes a second seat body and a second sealing member; The second sealing member is connected to a side of the second seat body close to the first pressure assembly, the second seat body is provided with a third through hole, the second sealing member is provided with a fourth through hole, and the third through hole is connected with the fourth through hole to form the second channel; The second sealing member is provided with a third sealing portion, and the third sealing portion is used for abutting and sealing with the second abutting portion.

9. The isolation valve according to claim 8, characterized in that The third sealing portion protrudes from a surface of the second sealing member in a direction approaching the first pressure assembly.

10. The isolation valve according to claim 8, characterized in that The second seat body and the second sealing member are integrated into one piece.

11. The isolation valve according to claim 8, characterized in that The second pressure assembly also includes a second spring; The second spring is arranged on a side of the second seat body away from the first pressure assembly. One end of the second spring is connected to the second sealing member, and the other end of the second spring is connected to the housing.

12. The isolation valve according to claim 8, characterized in that The second abutting portion is provided with an air hole penetrating the second abutting portion along the axial direction of the second channel.

13. The isolation valve according to claim 1, characterized in that The solenoid valve assembly also includes a valve housing, a coil assembly, an iron core, a third spring and a valve seat; The coil assembly is arranged in the valve housing, and the coil assembly is arranged around the circumference of the iron core; A fourth channel is provided in the iron core, and the valve stem can be movably inserted into the fourth channel; The valve seat is connected to a side of the valve housing close to the first pressure assembly through the third spring, and the end of the valve stem is movably inserted into the valve seat.

14. A fuel system, characterized in that: The invention comprises a fuel tank, a purification tank and the isolation valve according to any one of claims 1 to 13, wherein the isolation valve is connected between the fuel tank and the purification tank.

15. A vehicle, characterized in that: Includes the fuel system as claimed in claim 14.

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