High-pressure oil tank isolation valve for vehicle

Abstract

The utility model provides a kind of high-pressure oil tank isolation valve for vehicle, including shell, electromagnetic drive assembly, valve assembly and self-locking assembly, at least a part of self-locking assembly is located in upper chamber, and is connected with lower shell, self-locking assembly includes lock tongue and return spring, self-locking assembly has first state and second state, and can be switched from first state to second state under external force, in second state, at least a part of lock tongue is engaged with limiting portion, to open first opening, when lock tongue is disengaged from limiting portion, self-locking assembly is reset to first state from second state under the action of return spring;By setting self-locking assembly, it solves the cumbersome operation that oil tank isolation valve needs to be powered during refueling in vehicle assembly process, facilitate quick refueling, improve production efficiency, meet the adaptation function of whole vehicle, simultaneously, self-locking assembly is combined with valve assembly, also conducive to reducing product volume.

Description

Technical Field

[0001] This utility model relates to the field of isolation valve technology, specifically to a high-pressure fuel tank isolation valve for vehicles, and more particularly to a high-pressure fuel tank isolation valve with a self-opening function. Background Technology

[0002] With the increasing severity of vehicle exhaust pollution, emission regulations have become increasingly stringent, restricting vehicle emissions to the atmosphere. This has also spurred the rapid development of hybrid electric vehicle technology. Currently, hybrid vehicles, including plug-in hybrid electric vehicles (PHEVs), have gradually become the most accepted type of vehicle for the general public after several years of technological accumulation.

[0003] Hybrid electric vehicles (PHEVs) are not only highly intelligent but also possess the technical characteristics of being able to operate on both gasoline and electric power, resulting in better fuel economy. In response to this, a high-pressure fuel tank isolation valve has emerged. This valve strictly controls the emission of fuel vapors from the fuel tank to the carbon canister, preventing frequent transfer of fuel vapors from the fuel tank to the carbon canister during the switching between the fuel and electrical circuits in PHEV models, thus avoiding saturation or even direct venting into the atmosphere.

[0004] However, during the production of hybrid vehicles, a small amount of fuel is pre-filled into the fuel tank. But at this time, the fuel tank isolation valve may not be able to provide the driving power or may have difficulty providing the driving power due to the conditions of the customer's production line. In this case, the fuel tank isolation valve is in a closed state, which prevents the customer from refueling or causes the fuel nozzle to keep shutting off during the refueling process, reducing the production efficiency of the customer's production line.

[0005] Therefore, existing technologies suffer from the technical problem of low production efficiency during the assembly of hybrid vehicles because the high-pressure isolation valve is normally closed. Utility Model Content

[0006] The main objective of this invention is to provide a high-pressure fuel tank isolation valve for vehicles, in order to solve the technical problem of low production efficiency caused by the high-pressure isolation valve being in a normally closed state during the assembly process of hybrid vehicles.

[0007] To achieve the above objectives, according to one aspect of the present invention, a vehicle high-pressure fuel tank isolation valve is provided, comprising: The housing includes an upper housing and a lower housing. The upper end of the lower housing is connected to the upper housing. The lower housing has an upper chamber and a lower chamber. The upper chamber and the lower chamber are connected through a first opening. The upper chamber has a first port for connecting to the fuel tank, and the lower chamber has a second port for connecting to the carbon canister. An electromagnetic drive assembly is located inside the upper housing. The electromagnetic drive assembly includes an electromagnetic coil and an armature. The armature can reciprocate under the drive of the electromagnetic coil. A valve assembly, at least a portion of which is located in the upper chamber, is detachably connected to an armature and can move toward or away from the first opening under the action of the armature to seal or open the first opening. When the valve assembly seals the first opening, a first sealing surface is formed between the valve assembly and the upper chamber. A limiting part is also provided on the side of the valve assembly near the first opening. A self-locking assembly, at least a portion of which is located within the upper cavity and connected to the lower housing, comprises a latch and a return spring. The self-locking assembly has a first state and a second state, and can switch from the first state to the second state under external force. In the second state, at least a portion of the latch engages with the limiting portion to open the first opening. When the latch disengages from the limiting portion, the self-locking assembly returns to the first state under the action of the return spring. Furthermore, the limiting part is an annular limiting groove.

[0008] Furthermore, the self-locking assembly also includes a locking bracket and a latch, the latch is connected to the latch, a return spring is sleeved on the latch, the two ends of the return spring abut against the latch and the locking bracket respectively, the locking bracket is sleeved on the latch, and the latch can reciprocate under the action of the return spring.

[0009] Furthermore, the locking bracket is provided with positioning holes and fixing holes, and the lower housing is provided with positioning pins that match the positioning holes. The fixing component passes through the fixing holes to fix the locking bracket to the lower housing.

[0010] Furthermore, the locking bracket has a through hole for the bolt to pass through, a positioning groove is provided on the inner wall of the through hole, and the bolt has a positioning protrusion that matches the positioning groove.

[0011] Furthermore, a locking pin is provided at one end of the locking tongue near the valve assembly. In the second state, the locking pin engages with the limit switch to open the first opening.

[0012] Furthermore, the locking bracket includes a body, a first ear and a second ear, the first ear and the second ear extending outward from the body, and positioning holes and fixing holes respectively provided on the first ear and the second ear.

[0013] Furthermore, the valve assembly includes a first sealing valve and a second sealing valve, wherein, The first sealing valve is located in the upper chamber. The first sealing valve is detachably connected to the armature and can move towards or away from the first opening under the drive of the armature to seal or open the first opening. The first sealing valve has an air guide channel connecting the upper chamber and the lower chamber. When the first sealing valve seals the first opening, a first sealing surface is formed between the first sealing valve and the upper chamber. The second sealing valve is located in the lower chamber. At least a part of the second sealing valve is movably connected to the first sealing valve. Under the action of elastic force, the second sealing valve abuts against the first sealing valve to seal the air guide passage. When the second sealing valve seals the air guide passage, a second sealing surface is formed between the second sealing valve and the first sealing valve.

[0014] Furthermore, the valve assembly also includes a first spring and a second spring, wherein the first spring is sleeved outside the armature and the first sealing valve, one end of the first spring abuts against the first sealing valve, and the other end of the first spring abuts against the electromagnetic drive assembly, thereby pressing the first sealing valve against the first opening; a stepped surface is provided on the side of the lower chamber away from the upper chamber, and the second spring is located in the lower chamber, one end of the second spring abuts against the stepped surface, and the other end of the second spring abuts against the second sealing valve, so as to provide a preload force to the second sealing valve to bring it closer to the first sealing valve.

[0015] Furthermore, the first sealing valve includes a frame and an elastic sealing part, the elastic sealing part being connected to the frame. The frame includes a base plate and a snap-fit ​​tongue, the snap-fit ​​tongue being connected to the base plate. A second snap-fit ​​part, which is movably connected to the armature, is provided on the inner side of the snap-fit ​​tongue. The first elastic sealing part has a first sealing lip and a second sealing lip arranged in an annular shape, wherein the diameter of the first sealing lip is larger than the diameter of the second sealing lip. The first sealing lip is used to seal the first opening, the second sealing lip is used to seal the air guide channel, and the limiting part is located on the outer side of the first sealing lip.

[0016] The high-pressure oil tank isolation valve provided by this utility model has a self-locking component inside the housing. External force causes the self-locking component to be in a second state, where at least a portion of the locking tongue engages with the limiting part, preventing the valve assembly from closing and opening the first opening. This facilitates refueling the tank during production. When the vehicle rolls off the assembly line after refueling, the oil tank isolation valve is energized during the first power-on of the vehicle. When the solenoid valve armature moves upward for the first time, the locking tongue disengages from the limiting part, and the self-locking component resets from the second state to the first state under the action of the return spring. The oil tank isolation valve's open-keeping function is lost. When the oil tank isolation valve is de-energized again, the armature resets, and the pressure management function of the oil and gas in the high-pressure oil tank is restored. By setting the self-locking component, the cumbersome operation of energizing the oil tank isolation valve during refueling during vehicle assembly is solved, facilitating rapid refueling, improving the production efficiency of the vehicle rollout, and meeting the vehicle's compatibility requirements. Furthermore, the combination of the self-locking component and the valve assembly also helps to reduce the product size. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, 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 undue limitation of the present invention. In the drawings: Figure 1 A schematic diagram of the high-pressure oil tank isolation valve according to the present invention in its second state is shown; Figure 2 A schematic diagram showing the switching state of the high-pressure oil tank isolation valve according to the present invention under the action of external force is shown; Figure 3 A schematic diagram of the working state of the high-pressure oil tank isolation valve according to this utility model is shown; Figure 4 Another structural schematic diagram of the high-pressure oil tank isolation valve according to the present invention is shown in its working state; Figure 5 Another structural schematic diagram of the high-pressure oil tank isolation valve according to the present invention is shown in its working state; Figure 6 A schematic diagram of the skeleton according to the present invention is shown; Figure 7 A schematic diagram of the structure of the self-locking assembly according to the present invention is shown; Figure 8 Another structural schematic diagram of the self-locking assembly according to the present invention is shown.

[0018] The above figures include the following reference numerals: 10. Housing; 11. Upper housing; 12. Lower housing; 121. Upper chamber; 1211. First port; 122. Lower chamber; 1221. Second port; 1222. Stepped surface; 123. First opening; 20. Electromagnetic drive assembly; 21. Electromagnetic coil; 22. Armature; 30. Valve assembly; 31. Limiting part; 32. First sealing valve; 321. Air guide channel; 322. Frame; 3221. Base plate; 3222. Snap-fit ​​tongue; 323. Elastic sealing part; 3 231. First sealing lip; 32. Second sealing lip; 33. Second sealing valve; 34. First spring; 35. Second spring; 40. Self-locking assembly; 41. Locking tongue; 411. Positioning protrusion; 412. Locking pin; 42. Return spring; 43. Locking bracket; 431. Positioning hole; 432. Fixing hole; 433. Through hole; 434. Positioning groove; 435. Bracket body; 436. First ear; 437. Second ear; 44. Locking buckle; 50. Push rod. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] To address the technical problem of low production efficiency in the assembly of hybrid vehicles due to the high-pressure isolation valve being in a normally closed state during the assembly process, this utility model provides a high-pressure fuel tank isolation valve for vehicles.

[0023] like Figures 1 to 8As shown, this utility model provides a vehicle high-pressure fuel tank isolation valve. The vehicle high-pressure fuel tank isolation valve includes a housing 10, an electromagnetic drive assembly 20, a valve assembly 30, and a self-locking assembly 40. The housing 10 includes an upper housing 11 and a lower housing 12. The upper housing 11 is used to house the electromagnetic drive assembly 20, and the lower housing 12 is used to house the valve assembly 30 and the self-locking assembly 40. The upper end of the lower housing 12 is connected to the upper housing 11. The lower housing 12 has an upper chamber 121 and a lower chamber 122. The upper chamber 121 and the lower chamber 122 are connected through a first opening 123. The upper chamber 121 has a first port 1211 for connecting to the fuel tank, and the lower chamber 122 has a second port 1221 for connecting to the carbon canister. Thus, the upper chamber 121 is connected to the fuel tank through the first port 1211, and the lower chamber 122 is connected to the carbon canister through the second port 1221.

[0024] The lower shell 12 is a shell structure formed by one-piece injection molding, which reduces the laser welding process, reduces the number of components, and helps to improve production efficiency and reduce production costs.

[0025] The electromagnetic drive assembly 20 is located inside the upper housing 11. The electromagnetic drive assembly 20 includes an electromagnetic coil 21 and an armature 22. The armature 22 can reciprocate under the drive of the electromagnetic coil 21. A first receiving cavity is formed on the side of the electromagnetic drive assembly 20 near the first opening 123, and the armature 22 is located in the first receiving cavity.

[0026] At least a portion of the valve assembly 30 is located in the upper chamber 121. The valve assembly 30 is detachably connected to the armature 22 and can move towards or away from the first opening 123 under the drive of the armature 22 to seal or open the first opening 123. When the valve assembly 30 seals the first opening 123, a first sealing surface is formed between the valve assembly 30 and the upper chamber 121. A limiting part 31 is also provided on the side of the valve assembly 30 near the first opening 123.

[0027] The self-locking assembly 40 is located in the upper chamber 121 and connected to the lower housing 12. The self-locking assembly 40 includes a locking tongue 41 and a return spring 42. The self-locking assembly 40 has a first state and a second state, and can switch from the first state to the second state under the action of external force. In the first state, the self-locking assembly 40 does not interfere with the valve assembly 30, and the reciprocating motion of the valve assembly 30 is not affected by the self-locking assembly 40. In the second state, at least a part of the locking tongue 41 is engaged with the limiting part 31, thereby preventing the valve assembly 30 from moving towards the first opening 123, thus preventing the valve assembly 30 from sealing the first opening 123 and opening the first opening 123. When the locking tongue 41 disengages from the limiting part 31, the self-locking assembly 40 is reset from the second state to the first state under the action of the return spring 42.

[0028] The fuel tank isolation valve provided by this utility model has a self-locking component 40 installed inside the housing 10. By applying external force, such as using a push rod 50 to push the end of the locking tongue 41, the self-locking component 40 is placed in a second state, where at least a portion of the locking tongue 41 engages with the limiting part 31 to open the first opening 123, thus facilitating refueling of the fuel tank by the customer during production. When the vehicle rolls off the production line after refueling, the fuel tank isolation valve is energized during the first power-on of the vehicle. When the armature 22 moves upward for the first time, the locking tongue 41 disengages from the limiting part 31, and the self-locking component 40... Under the action of the return spring 42, the oil tank isolation valve is reset from the second state to the first state. The function of keeping the oil tank isolation valve open is lost. After the oil tank isolation valve is de-energized, the armature 22 of the oil tank isolation valve is reset and normally realizes the pressure management function of oil and gas in the high-pressure oil tank. By setting the self-locking component 40, the cumbersome operation of energizing the oil tank isolation valve during refueling during the vehicle assembly process is solved, which facilitates fast refueling, helps to improve the production efficiency of the vehicle off the line, and meets the adaptation function of the vehicle. At the same time, the combination of the self-locking component 40 and the valve component 30 also helps to reduce the product size.

[0029] Optionally, the limiting part 31 is an annular limiting groove, so that any circumferential position of the valve assembly 30 can engage with the locking tongue 41. This arrangement is more conducive to the assembly of the valve assembly 30.

[0030] Furthermore, the self-locking assembly 40 also includes a locking bracket 43 and a latch 44. One end of the latch 41 is connected to the latch 44, and a return spring 42 is sleeved on the latch 41. The two ends of the return spring 42 abut against the latch 44 and the locking bracket 43 respectively. The locking bracket 43 is sleeved on the latch 41, and the latch 41 can reciprocate under the action of the return spring 42.

[0031] Specifically, the latch 44 is ring-shaped, with several first engaging portions extending from the edge of the ring towards the latch 41. The latch 41 has a stepped portion at one end near the latch 44 that can engage with the first engaging portions. The other end of the latch 41 is provided with a locking pin 412. In the second state, the locking pin 412 engages with a limit switch to open the first opening 123. The latch 44 is detachably fixed to the latch 41 by engaging with the stepped portion through the first engaging portion. The latch 44 is provided with a first abutting portion for abutting against the return spring 42. The end of the return spring 42 away from the locking bracket 43 abuts against the first abutting portion. The locking bracket 43 is sleeved on the locking tongue 41, which can reciprocate under the action of the return spring 42. The locking bracket 43 has a through hole 433 through which the locking tongue 41 passes. A positioning groove 434 is provided on the inner wall of the through hole 433. The locking tongue 41 has a positioning protrusion 411 that matches the positioning groove 434. The locking pin 412 is set perpendicular to the direction of the reciprocating movement of the locking tongue 41. In the first state, the locking pin 412 abuts against the locking bracket 43 under the action of the return spring 42.

[0032] To facilitate the connection between the locking bracket 43 and the lower housing 12, the locking bracket 43 is provided with a positioning hole 431 and a fixing hole 432, and the lower housing 12 is provided with a positioning pin that matches the positioning hole 431. The fixing member passes through the fixing hole 432 to fix the locking bracket 43 and the lower housing 12.

[0033] During assembly, the positioning hole 431 is first inserted into the positioning pin located on the lower housing 12 to position the locking bracket 43, and the locking bracket 43 is fixed to the lower housing 12 by a fastener, such as a screw.

[0034] Preferably, the locking bracket 43 includes a bracket body 435, a first ear portion 436 and a second ear portion 437, the first ear portion 436 and the second ear portion 437 extending outward from the body 435, and a positioning hole 431 and a fixing hole 432 respectively disposed on the first ear portion 436 and the second ear portion 437.

[0035] Furthermore, the valve assembly 30 includes a first sealing valve 32 and a second sealing valve 33. The first sealing valve 32 is located in the upper chamber 121 and is detachably connected to the armature 22, so that it can move towards or away from the first opening 123 under the drive of the armature 22 to seal or open the first opening 123. When the first sealing valve 32 seals the first opening 123, a first sealing surface is formed between the first sealing valve 32 and the upper chamber 121. The first sealing valve 32 has a gas guide channel 321 connecting the upper chamber 121 and the lower chamber 122. The second sealing valve 33 is located in the lower chamber 122, and at least a part of the second sealing valve 33 is movably connected to the first sealing valve 32. Under the action of elastic force, the second sealing valve 33 abuts against the first sealing valve 32 to seal the gas guide channel 321. When the second sealing valve 33 seals the gas guide channel 321, a second sealing surface is formed between the second sealing valve 33 and the first sealing valve 32.

[0036] Furthermore, the valve assembly 30 also includes a first spring 34 and a second spring 35. The first spring 34 is sleeved on the outside of the armature 22 and the first sealing valve 32. One end of the first spring 34 abuts against the first sealing valve 32, and the other end of the first spring 34 abuts against the electromagnetic drive assembly 20, thereby pressing the first sealing valve 32 against the first opening 123. A stepped surface 1222 is provided on the side of the lower chamber 122 away from the upper chamber 121. The second spring 35 is located in the lower chamber 122. One end of the second spring 35 abuts against the stepped surface 1222, and the other end of the second spring 35 abuts against the second sealing valve 33 to provide a preload force to the second sealing valve 33 to bring it closer to the first sealing valve 32.

[0037] Preferably, the first spring 34 can be, for example, a frustum-shaped compression spring, as shown in the figure. The side of the first spring 34 with a larger diameter presses against the electromagnetic drive assembly 20, and the side of the first spring 34 with a smaller diameter presses against the first sealing valve 32, thereby applying a force away from the electromagnetic drive assembly 20 to the first sealing valve 32, causing it to press against the inner surface of the lower part of the upper chamber 121, thereby achieving a seal on the first opening 123.

[0038] The first sealing valve 32 includes a frame 322 and an elastic sealing part 323. The elastic sealing part 323 is connected to the frame 322. Optionally, the elastic sealing part 323 can be made of rubber. The first elastic sealing part 323 and the frame 322 are fixed by vulcanization. The frame 322 includes a base plate 3221 and a snap-fit ​​tongue 3222. The snap-fit ​​tongue 3222 is connected to the base plate 3221. The inner side of the snap-fit ​​tongue 3222 is provided with a second snap-fit ​​part that is movably connected to the armature 22. The snap-fit ​​tongue 3222 has a certain elasticity, so that during the assembly process, the snap-fit ​​tongue 3222 can elastically abut against the outer periphery of the armature 22, and the second snap-fit ​​part engages with the armature 22, thereby realizing the detachable connection between the armature 22 and the first sealing valve 32. The first elastic sealing part 323 has a first sealing lip 3231 and a second sealing lip 3232 arranged in an annular shape, wherein the diameter of the first sealing lip 3231 is larger than the diameter of the second sealing lip 3232. The first sealing lip 3231 is used to seal the first opening 123, and the second sealing lip 3232 is used to seal the air guide channel 321. The limiting part 31 is located outside the first sealing lip 3231.

[0039] The first sealing valve 32 also includes a frustum located in the middle of the base plate 3221, and a first through hole 433 for forming an air guide channel 321 is provided on the frustum.

[0040] Furthermore, the second sealing valve 33 includes a valve plate, a guide post, and an exhaust groove. The exhaust groove forms part of the air guide channel 321 as shown in the figure. The guide post extends from the valve plate toward the first sealing valve 32. The guide post is slidably connected to the first through hole 433 and can reciprocate within the first through hole 433. An exhaust groove is formed on the side of the guide post. The pressure from the oil tank can act on the upper surface of the valve plate through the exhaust groove, thereby transmitting the pressure to the second spring 35 located in the lower chamber 122 through the valve plate. When the pressure is greater than the spring force of the second spring 35, it will push the second spring 35 downward, thereby opening the air guide channel 321 between the upper chamber 121 and the lower chamber 122, realizing gas communication between the oil tank and the carbon canister.

[0041] The exhaust channels can be provided in two or more, and the two or more exhaust channels are evenly arranged on the outer periphery of the guide column.

[0042] Optionally, the second sealing valve 33 also includes a positioning boss located on the side of the valve plate away from the guide post. One end of the second spring 35 abuts against the valve plate and is sleeved on the outer periphery of the positioning boss, thereby positioning the second spring 35 through the positioning boss. This arrangement is beneficial for the installation and positioning of the second sealing valve 33.

[0043] Furthermore, a positioning ring for connecting to the first sealing valve 32 is provided on the side of the armature 22 away from the upper cavity, and a vent hole communicating with the air guide channel 321 is provided on the side of the armature 22. High-pressure gas in the oil tank can enter the interior of the armature 22 through the vent hole, thereby entering the air guide channel 321.

[0044] During the assembly process of the high-pressure isolation valve for vehicles provided by this utility model, the locking tongue 41 is passed through the through hole 433 of the locking bracket 43, the return spring 42 is sleeved on the locking tongue 41, and the locking buckle 44 is engaged and fixed with the stepped part on the locking tongue 41, so that the return spring 42 is located between the locking buckle 44 and the locking bracket 43. After the assembly of the locking tongue 41 and the locking bracket 43 is completed, the positioning hole 431 is passed through the positioning pin located on the lower housing 12 to realize the positioning of the locking bracket 43, and the locking bracket 43 is fixed to the lower housing 12 by the fastener, thereby completing the assembly of the self-locking component 40. After the assembly of the self-locking component 40 is completed, the electromagnetic drive component 20 is assembled.

[0045] After the high-pressure isolation assembly is completed, the electromagnetic coil 21 of the electromagnetic drive assembly 20 is energized. The first sealing valve 32 will move upward under the action of electromagnetic force. At this time, the push rod 50 is inserted into the isolation valve from the first port 1211 and a certain force is applied to the tail of the latch 44 to overcome the spring force of the return spring 42 and drive the locking pin 412 to move closer to the valve assembly 30. When the locking pin 412 is below the limiting part 31 of the first sealing gasket 32, the power supply to the electromagnetic coil 21 of the electromagnetic drive assembly 20 is stopped. The first sealing valve 32 moves downward under the action of the first spring 34, so that the limiting part 31 abuts against the locking pin 412 located at one end of the locking tongue 41. The locking pin 412 obstructs the downward movement path of the first sealing valve 32. There is also a flow channel between the first sealing valve 32 and the first opening 123, so that the first opening 123 remains open. When there is pressure input at the oil tank end, the oil vapor pressure flows through the flow channel.

[0046] When the electromagnetic drive assembly 20 is energized again, the armature 22 drives the first sealing valve 32 to move upward again, causing the locking pin 412 to disengage from the limiting part 31. At this time, the locking pin 412 in the self-locking assembly 40 moves away from the valve assembly 30 under the action of the return spring 42, and the self-locking assembly 40 returns to the first state and enters the self-locking failure state. When the electromagnetic drive coil 20 is de-energized, the first sealing valve 32 abuts against the outer shell under the action of the first spring 34, and the oil tank isolation valve is in a closed state. At this time, the self-locking assembly 40 is in the first state of not interfering with the valve assembly 30 and no longer affects the opening of the first solenoid valve. The oil tank isolation valve begins to regulate the positive and negative pressure of the oil tank. During the regulation process, the oil tank isolation valve has three working conditions: refueling condition, depressurization condition, and air replenishment condition. In the refueling operation, the electromagnetic drive assembly 20 is energized. After the electromagnetic drive assembly 20 is energized, the armature 22, under the action of electromagnetic force, drives the first sealing valve 32 to move upward, and the first opening 123 is fully opened, so that the pressure inside the oil tank is released quickly. The gas flow direction is: from the oil tank, it enters the upper chamber 121 through the first port 1211, enters the lower chamber 122 through the first opening 123, and then enters the carbon canister through the second port 1221. At this time, the electromagnetic force needs to overcome the pressure of the oil tank pressure acting on the first sealing valve 32 and the spring force of the first spring 34, so that the rubber seal at the front of the first sealing valve 32 and the sealing step surface 1222 on the lower housing 12 are disengaged to achieve active pressure relief.

[0047] like Figure 6 As shown, the pressure relief condition occurs when the vehicle has been parked for a long time, and the gasoline in the fuel tank continuously evaporates under external conditions such as temperature, causing the internal pressure of the fuel tank to rise. When the pressure rises to a certain limit, the pressure acting on the second sealing valve 33 is greater than the elastic force of the second spring 35, causing the second sealing valve 33 to move away from the first sealing valve 32, opening the venting passage 321, and completing the passive pressure relief. The gas flow direction is: from the fuel tank, it enters the upper chamber 121 through the first port 1211, enters the venting passage 321 through the vent hole, then enters the lower chamber 122, and then enters the carbon canister through the second port. Therefore, it can be seen that by adjusting the elastic coefficient of the second spring 35, the opening pressure of the venting passage 321 can be adjusted, so that the pressure inside the fuel tank is always within a safe range.

[0048] like Figure 5As shown, the air replenishment condition occurs when the vehicle engine operates for an extended period, generating negative pressure in the fuel tank. When the negative pressure reaches a certain limit, the first sealing valve 32 opens upwards under the positive pressure of the carbon canister, replenishing the fuel tank with air. The gas flow direction is as follows: gas enters the lower chamber from the carbon canister through the second port 1221, then enters the upper chamber 121 through the first opening 123, and finally enters the fuel tank through the first port 1211. At this time, the opening pressure limit can be adjusted by adjusting the elastic coefficient, i.e., the elastic stiffness, of the first spring 34. By setting the first spring 34 and the second spring 35, the opening pressure of the depressurization condition and the air replenishment condition can be adjusted, thereby achieving self-regulation of the internal pressure of the fuel tank.

[0049] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0050] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0051] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0052] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A vehicle high-pressure fuel tank isolation valve, characterized in that, include: The housing includes an upper housing and a lower housing, the upper end of the lower housing is connected to the upper housing, the lower housing has an upper chamber and a lower chamber, the upper chamber and the lower chamber are connected through a first opening, the upper chamber has a first port for connecting to an oil tank, and the lower chamber has a second port for connecting to a carbon canister; An electromagnetic drive assembly is located inside the upper housing. The electromagnetic drive assembly includes an electromagnetic coil and an armature. The armature is capable of reciprocating under the drive of the electromagnetic coil. A valve assembly, at least a portion of which is located in the upper chamber, is detachably connected to the armature and can move toward or away from the first opening under the action of the armature to seal or open the first opening. When the valve assembly seals the first opening, a first sealing surface is formed between the valve assembly and the upper chamber. A limiting portion is provided on the side of the valve assembly near the first opening. A self-locking assembly, at least a portion of which is located in the upper cavity and connected to the lower housing, includes a locking tongue and a return spring. The self-locking assembly has a first state and a second state, and can switch from the first state to the second state under the action of an external force. In the second state, at least a portion of the locking tongue engages with the limiting part to open the first opening. When the locking tongue disengages from the limiting part, the self-locking assembly returns to the first state from the second state under the action of the return spring.

2. The vehicle high-pressure fuel tank isolation valve according to claim 1, characterized in that, The limiting part is an annular limiting groove.

3. The vehicle high-pressure fuel tank isolation valve according to claim 1, characterized in that, The self-locking assembly further includes a locking bracket and a latch. The latch is connected to the latch, and the return spring is sleeved on the latch. The two ends of the return spring abut against the latch and the locking bracket, respectively. The locking bracket is sleeved on the latch, and the latch can reciprocate under the action of the return spring.

4. The vehicle high-pressure fuel tank isolation valve according to claim 3, characterized in that, The locking bracket is provided with a positioning hole and a fixing hole, and the lower housing is provided with a positioning pin that matches the positioning hole. The fixing member passes through the fixing hole to fix the locking bracket to the lower housing.

5. The vehicle high-pressure fuel tank isolation valve according to claim 3, characterized in that, The locking bracket has a through hole through which the bolt passes, and a positioning groove is provided on the inner wall of the through hole. The bolt has a positioning protrusion that matches the positioning groove.

6. The vehicle high-pressure fuel tank isolation valve according to claim 3, characterized in that, A locking pin is provided at one end of the locking tongue near the valve assembly. In the second state, the locking pin engages with the limiting part to open the first opening.

7. The vehicle high-pressure fuel tank isolation valve according to claim 4, characterized in that, The locking bracket includes a body, a first ear and a second ear, the first ear and the second ear extending outward from the body, and the positioning hole and the fixing hole are respectively provided on the first ear and the second ear.

8. The vehicle high-pressure fuel tank isolation valve according to claim 1, characterized in that, The valve assembly includes a first sealing valve and a second sealing valve, wherein... The first sealing valve is located in the upper chamber. The first sealing valve is detachably connected to the armature and can move towards or away from the first opening under the drive of the armature to seal or open the first opening. The first sealing valve has an air passage connecting the upper chamber and the lower chamber. When the first sealing valve seals the first opening, a first sealing surface is formed between the first sealing valve and the upper chamber. The second sealing valve is located in the lower chamber. At least a portion of the second sealing valve is movably connected to the first sealing valve. Under the action of elastic force, the second sealing valve abuts against the first sealing valve to seal the air guide passage. When the second sealing valve seals the air guide passage, a second sealing surface is formed between the second sealing valve and the first sealing valve.

9. The vehicle high-pressure fuel tank isolation valve according to claim 8, characterized in that, The valve assembly further includes a first spring and a second spring, wherein the first spring is sleeved outside the armature and the first sealing valve, one end of the first spring abuts against the first sealing valve, and the other end of the first spring abuts against the electromagnetic drive assembly, thereby pressing the first sealing valve against the first opening; a stepped surface is provided on the side of the lower chamber away from the upper chamber, the second spring is located in the lower chamber, one end of the second spring abuts against the stepped surface, and the other end of the second spring abuts against the second sealing valve, so as to provide a preload force to the second sealing valve to bring it closer to the first sealing valve.

10. The vehicle high-pressure fuel tank isolation valve according to claim 8, characterized in that, The first sealing valve includes a frame and an elastic sealing part. The elastic sealing part is connected to the frame. The frame includes a base plate and a snap-fit ​​tongue. The snap-fit ​​tongue is connected to the base plate. A second snap-fit ​​part is provided on the inner side of the snap-fit ​​tongue and is movably connected to the armature. The elastic sealing part has a first sealing lip and a second sealing lip arranged in annular shape. The diameter of the first sealing lip is larger than the diameter of the second sealing lip. The first sealing lip is used to seal the first opening, and the second sealing lip is used to seal the air guide channel. The limiting part is located on the outer side of the first sealing lip.

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