Integrated high-pressure isolating valve for vehicle

Abstract

The utility model provides an integrated vehicle high-pressure isolating valve, which comprises a shell, an electromagnetic coil assembly and a valve assembly, the electromagnetic coil assembly is positioned in the upper shell, the valve assembly comprises an armature, a first sealing valve and a second sealing valve, one end of the armature close to the electromagnetic coil assembly is positioned in a first accommodating cavity and is in floating connection with the first accommodating cavity, and the other end of the armature is positioned in a second accommodating cavity. The armature reciprocates in the first containing cavity under the action of the electromagnetic coil assembly, the end, away from the armature, of the first sealing valve is provided with a first sealing face used for sealing the first opening, and the first sealing valve is further provided with a second opening communicating the second containing cavity with the lower cavity. At least one part of the second sealing valve elastically abuts against the first sealing face so as to seal the second opening. The armature in floating connection is adopted to replace an original valve assembly with a center guide shaft, so that the situation that the guide precision of a traditional guide mode of the center guide shaft is affected by an assembly size chain and an assembly process is avoided, and the process difficulty and the process cost are reduced.

Description

Technical Field

[0001] This utility model relates to the field of isolation valve technology, and more specifically, to an integrated high-pressure isolation valve for vehicles. 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) and range-extended hybrid electric vehicles (REEVs), have gradually become the most accepted vehicle types for the general public after several years of technological accumulation.

[0003] Hybrid vehicles not only offer excellent fuel economy but also allow for switching between engine and battery operation, effectively alleviating range anxiety associated with the unstable range of pure electric vehicles. However, in hybrid vehicles, the switching between the fuel system and the electrical system can lead to frequent release of fuel vapors from the fuel tank to the carbon canister, potentially saturating it or even venting it directly into the atmosphere. Currently, fuel tank isolation valves are typically used to strictly control the release of fuel vapors from the fuel tank to the carbon canister.

[0004] In existing technologies, high-pressure isolation valves typically use two independent valves, a pressure relief valve and a gas replenishment valve, to regulate the air pressure in the oil tank. This results in a complex structure that is not conducive to assembly and processing. The inner wall of the coil frame and the fixed iron core are usually positioned by a guide shaft. This makes the guiding method of the central guide shaft highly susceptible to the influence of the assembly dimension chain and assembly process, resulting in high processing difficulty and high processing cost.

[0005] Therefore, existing isolation valves suffer from technical problems such as complex structure, difficult processing technology, and high processing cost. Utility Model Content

[0006] The main objective of this invention is to provide an integrated high-pressure isolation valve for vehicles, in order to solve the technical problems of existing isolation valves having complex structures, difficult processing techniques, and high processing costs.

[0007] To achieve the above objectives, according to one aspect of the present invention, an integrated automotive high-pressure isolation valve is provided, comprising:

[0008] The housing includes an upper housing and a lower housing, the lower end of the lower housing is connected to the upper housing, the lower housing has an upper cavity and a lower cavity, and the upper cavity and the lower cavity are connected through a first opening;

[0009] An electromagnetic coil assembly is located inside the upper housing, and a first receiving cavity is formed on the side of the electromagnetic coil assembly near the first opening;

[0010] A valve assembly, at least a portion of which is located within the upper cavity and capable of reciprocating under the drive of an electromagnetic coil assembly, to open or close the first opening. The valve assembly includes an armature, a first sealing valve, and a second sealing valve. The end of the armature near the electromagnetic coil assembly is located within the first receiving cavity and is floatingly connected to the first receiving cavity. The armature reciprocates within the first receiving cavity under the action of the electromagnetic coil assembly. The end of the armature away from the electromagnetic coil assembly is connected to the first sealing valve. A second receiving cavity is formed between the armature and the first sealing valve. The end of the first sealing valve away from the armature is provided with a first sealing surface for sealing the first opening. The first sealing valve is also provided with a second opening connecting the second receiving cavity and the lower cavity. At least a portion of the second sealing valve passes through the second opening and enters the second receiving cavity. At least a portion of the second sealing valve elastically abuts against the first sealing surface to seal the second opening.

[0011] The electromagnetic coil assembly includes a coil protective shell, a coil frame, an electromagnetic coil, and a fixed iron core. The coil frame is disposed inside the coil protective shell, the electromagnetic coil is wound around the coil frame, and the fixed iron core is inserted into the electromagnetic coil. The electromagnetic coil assembly also includes a metal guide sleeve, which is a cylindrical structure with one end open. The metal guide sleeve is located between the coil frame and the fixed iron core and forms the first receiving cavity.

[0012] Furthermore, the coil protective shell at least partially surrounds the electromagnetic coil, and the coil protective shell includes an inner shell, an outer shell, and a bottom shell, wherein the bottom shell connects the inner shell and the outer shell, and at least a portion of the inner shell is located between the electromagnetic coil and the metal conductor sleeve.

[0013] Furthermore, the metal guide sleeve includes: a guide sleeve body, the guide sleeve body having a cylindrical structure with one open end; and an undercut structure, the undercut structure being disposed at the open end of the guide sleeve body, the undercut structure including a flange and a bending portion, the flange extending from the open end of the guide sleeve body to both sides and being arranged in a ring shape, and the bending portion bending from the edge of the flange in a direction away from the upper housing.

[0014] Furthermore, the bottom of the guide sleeve body is also provided with an avoidance groove.

[0015] Furthermore, a blind hole is provided at the end of the armature away from the first sealing valve, and the armature also includes a rubber pad with a T-shaped structure, one end of which is movably connected to the blind hole.

[0016] Furthermore, the valve assembly also includes a first spring, one end of which abuts against the electromagnetic coil assembly, and the other end of which abuts against the first sealing valve, thereby pressing the first sealing surface of the first sealing valve against the first opening.

[0017] Furthermore, a snap-fit ​​portion is provided on the outer side of the armature away from the upper cavity, and the first sealing valve is provided with a snap-fit ​​structure that can engage with the snap-fit ​​portion.

[0018] Furthermore, the second sealing valve includes a first end, a second end, and a connecting section connecting the first end and the second end. The first end can pass through the second opening and enter the second receiving cavity. The side of the second end near the first end elastically abuts against the first sealing surface. At least one vent groove is recessed on the connecting section, and a pressure relief channel is formed between the vent groove and the second opening.

[0019] Furthermore, the valve assembly also includes a limiting ring and a second spring, wherein the limiting ring is detachably connected to the second sealing valve, the limiting ring is sleeved on the connecting section, one end of the second spring abuts against the limiting ring, and the other end of the second spring abuts against the first sealing valve, thereby abutting the side of the second end near the first end against the second opening.

[0020] Furthermore, a rubber seal is detachably connected to the end of the first sealing valve away from the armature. The rubber seal is provided with a first sealing part and a second sealing part arranged in an annular shape. The inner diameter of the first sealing part is larger than the inner diameter of the second sealing part. The first sealing part abuts against the inner wall of the upper cavity to seal the first opening, and the second sealing part abuts against the second sealing valve to seal the second opening.

[0021] The integrated automotive high-pressure isolation valve provided by this utility model uses a floating connection armature to replace the original valve assembly with a central guide shaft. This avoids the influence of assembly dimension chains and assembly processes on the guiding accuracy of the traditional central guide shaft method, reducing process difficulty and cost. Simultaneously, by setting a second sealing valve in the second receiving cavity, and having one end of the second sealing valve elastically abut against the first sealing surface to seal the second opening, the OVR valve (over-vacuum release valve) and the OPR valve (over-pressure release valve) are integrated into a single unit. The overall structure is simple and easy to assemble. With the flow cross-sectional area unchanged, the flow capacity is enhanced and the pressure drop is reduced. Furthermore, the OVR valve has a smaller pressure-bearing area, requiring less electromagnetic force, resulting in a more compact product. The guide ribs at the bottom of the lower housing improve the assembly stability of the first spring. Attached Figure Description

[0022] 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:

[0023] Figure 1 A schematic diagram of the integrated automotive high-pressure isolation valve according to the present invention is shown.

[0024] Figure 2 A schematic diagram of the structure of an electromagnetic coil assembly according to the present invention is shown;

[0025] Figure 3 A schematic diagram of the structure of the coil protective shell according to the present invention is shown;

[0026] Figure 4 A schematic diagram of the structure of the metal guide sleeve according to the present invention is shown;

[0027] Figure 5 A schematic diagram of the valve assembly according to the present invention is shown;

[0028] Figure 6 A schematic diagram of the structure of the second sealing valve and the limiting ring according to the present invention is shown.

[0029] The above figures include the following reference numerals:

[0030] 10. Housing; 11. Upper housing; 111. First annular rib; 112. Second annular rib; 12. Lower housing; 121. Upper cavity; 122. Lower cavity; 123. First opening; 20. Electromagnetic coil assembly; 21. First receiving cavity; 22. Coil protective shell; 221. Inner housing; 222. Outer housing; 223. Bottom housing; 23. Coil frame; 24. Electromagnetic coil; 25. Stator core; 26. Pin; 27. Diode; 28. Metal guide sleeve; 281. Guide sleeve body Body; 2811, clearance groove; 282, inverted structure; 2821, flange; 2822, bending part; 30, valve assembly; 31, armature; 311, rubber pad; 312, snap-fit ​​part; 32, first sealing valve; 321, snap-fit ​​structure; 33, second sealing valve; 331, first end; 332, second end; 333, connecting section; 3331, vent groove; 3332, flat position; 34, first spring; 35, limiting ring; 351, mounting opening; 36, second spring. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] To address the technical problems of existing isolation valves, such as complex structure, difficult processing technology, and high processing cost, this utility model provides an integrated high-pressure isolation valve for vehicles.

[0035] like Figures 1 to 6 As shown, this utility model provides an integrated automotive high-pressure isolation valve, such as... Figure 1 As shown, the integrated automotive high-pressure isolation valve includes a housing 10, an electromagnetic coil assembly 20, and a valve assembly 30.

[0036] The housing 10 includes an upper housing 11 and a lower housing 12. The lower end of the upper housing 11 is connected to the lower housing 12. The lower housing 12 has an upper cavity 121 and a lower cavity 122, which are connected by a first opening 123. The upper cavity 121 is connected to the fuel tank gas via a first connecting pipe, and the lower cavity 122 is connected to the carbon canister gas via a second connecting pipe. Thus, gas communication between the fuel tank and the carbon canister is achieved through the housing. The high-pressure vapor formed in the fuel tank can enter the carbon canister through the upper cavity 121, the first opening 123, and the lower cavity 122, and be adsorbed by the carbon canister.

[0037] The electromagnetic coil assembly 20 is disposed inside the upper housing 11, and a first receiving cavity 21 is formed on the side of the electromagnetic coil assembly 20 near the first opening 123; at least a portion of the valve assembly 30 is located inside the upper cavity 121 and can reciprocate under the drive of the electromagnetic coil assembly 20 to open or close the first opening 123, thereby cutting off or connecting the gas communication between the oil tank and the carbon canister.

[0038] The valve assembly 30 includes an armature 31, a first sealing valve 32, and a second sealing valve 33. The end of the armature 31 closest to the electromagnetic coil assembly 20 is located within the first receiving cavity 21 and is floatingly connected to it. The armature 31 reciprocates within the first receiving cavity 21 under the action of the electromagnetic coil assembly 20. The end of the armature 31 furthest from the electromagnetic coil assembly 20 is connected to the first sealing valve 32, forming a second receiving cavity between the armature 31 and the first sealing valve 32. The end of the first sealing valve 32 furthest from the armature 31 is provided with a first sealing surface for sealing the first opening 123. The first sealing valve 32 also has a second opening connecting the second receiving cavity and the lower cavity 122. At least a portion of the second sealing valve 33 passes through the second opening and enters the second receiving cavity. At least a portion of the second sealing valve 33 elastically abuts against the first sealing surface to seal the second opening.

[0039] Furthermore, the electromagnetic coil assembly 20 includes a coil protective shell 22, a coil frame 23, an electromagnetic coil 24, a fixed iron core 25, a pin 26 for connection to the vehicle ECU, and diodes 27 for connection to the electromagnetic coil 24 and the pin 26, respectively. The coil frame 23 is disposed within the coil protective shell 22, the electromagnetic coil 24 is wound around the coil frame 23, and the fixed iron core 25 is inserted into the electromagnetic coil 24. The electromagnetic coil assembly 20 also includes a metal guide sleeve 28, which is a cylindrical structure with one open end. The metal guide sleeve 28 is located between the coil frame 23 and the fixed iron core 25, forming a first receiving cavity 21. During assembly, the metal guide sleeve 28 and the armature 31 are fitted with a clearance fit. The metal guide sleeve 28 directly guides the up-and-down sliding of the armature 31. This arrangement is more conducive to the sliding positioning of the armature 31 and also facilitates product processing. The integrated automotive high-pressure isolation valve provided by this utility model uses a floating connection armature 31 to replace the original valve assembly 30 with a central guide shaft. This avoids the influence of assembly dimension chain and assembly process on the guiding accuracy of the traditional central guide shaft, thus reducing the difficulty and cost of the process. At the same time, by setting a second sealing valve 33 in the second receiving cavity, and making one end of the second sealing valve 33 elastically abut against the first sealing surface, the second opening is sealed, thereby integrating the OVR valve (over-vacuum release valve) and the OPR valve (over-pressure release valve) into a whole. The overall structure is simple and easy to assemble. With the flow cross-sectional area unchanged, the flow capacity is strengthened and the pressure drop is reduced. At the same time, the pressure-bearing area of ​​the OVR valve is small, the electromagnetic force requirement is smaller, and the product is more compact.

[0040] Preferably, the metal guide sleeve 28 can be made of stainless steel, for example, with a thickness of 0.1mm-0.3mm, preferably 0.2mm.

[0041] like Figure 2 As shown, the coil protective shell 22 at least partially surrounds the electromagnetic coil 24. The coil protective shell 22 includes an inner shell 221, an outer shell 222, and a bottom shell 223. The bottom shell 223 connects the inner shell 221 and the outer shell 222. The electromagnetic coil 24 is at least partially located within the space enclosed by the inner shell 221, the outer shell 222, and the bottom shell 223. The coil protective shell 22 is made of a magnetically conductive material, such as iron. By providing the coil protective shell 22 outside the electromagnetic coil 24, the magnetic lines of force generated by the electromagnetic coil 24 are enclosed inside, which enhances the attraction force of the electromagnetic coil 24 and improves the efficiency of the electromagnet.

[0042] Preferably, such as Figure 3 As shown, the coil protective shell 22 is integrally machined, which helps to reduce processing costs and improve assembly efficiency; of course, it can also be set up by separately machining the inner shell, outer shell and bottom shell and then assembling them together.

[0043] Furthermore, the inner shell is located at least partially between the electromagnetic coil 24 and the metal guide sleeve 28. By setting the metal guide sleeve 28, the air gap between the armature 31 and the coil protective shell 22 is reduced, so that the inner shell of the coil protective shell 22 is close to the outer side of the metal guide sleeve 28, which can further reduce the air gap and is conducive to further enhancing the electromagnetic force of the electromagnetic coil 24 on the armature 31.

[0044] Specifically, the upper housing 11 has a receiving space for installing the electromagnetic coil 24. The lower part of the upper housing 11 has a clearance opening for the armature 31 to pass through. A first annular rib 111 extending towards the side of the lower housing 12 is formed at the clearance opening. The lower part of the upper housing 11 is also provided with a second annular rib 112 arranged parallel to the first annular rib 111. The inner side of the first annular rib 111 can abut against at least a part of the metal guide sleeve 28 to form a seal. The second annular rib 112 can be welded to the lower housing 12.

[0045] A coil protective shell 22 is installed inside the upper housing 11. A coil frame 23 is provided inside the coil protective shell 22. The coil frame 23 has a central through hole. The fixed iron core 25 is located above the central through hole. The upper end of the fixed iron core 25 is connected to an upper cover plate. The lower end of the coil frame 23 is connected to a lower cover plate. Enamelled wire is wound inside the coil frame 23. A metal guide sleeve 28 is located below the central through hole. The upper part of the metal guide sleeve 28 abuts against the fixed iron core 25. The lower part of the metal guide sleeve 28 abuts against the coil protective shell 22. An elastic sealing ring is provided between the metal guide sleeve 28 and the coil protective shell 22 to achieve a seal between the upper housing 11 and the first chamber.

[0046] Optionally, the metal guide sleeve 28 includes a guide sleeve body 281 and an undercut structure 282. The guide sleeve body 281 is a cylindrical structure with one open end, which facilitates product processing. The undercut structure 282 is located at the open end of the guide sleeve body 281 and includes a flange 2821 and a bent portion 2822. The flange 2821 extends from the open end of the guide sleeve body 281 to both sides and is arranged in a ring shape. During installation, the elastic sealing ring abuts against the ring structure, thereby supporting the elastic sealing ring through the flange 2821. The bent portion 2822 bends from the edge of the flange 2821 away from the upper housing 11, allowing the end of the bent portion 2822 to abut against the coil protective shell 22.

[0047] In one specific embodiment of this application, the bottom of the guide sleeve body 281 is also provided with a relief groove 2811; the end of the armature 31 away from the first sealing valve 32 is provided with a blind hole, and the armature 31 also includes a rubber pad 311. The rubber pad 311 has a T-shaped structure, one end of the T-shaped structure is movably connected to the blind hole, and the shape of the other end of the T-shaped structure matches the relief groove 2811. During operation, the rubber pad 311 can abut against the relief groove 2811, thereby preventing the armature 31 from colliding with the bottom of the guide sleeve body 281 through the elasticity of the rubber pad 311, which helps to avoid collision noise and possible damage to the components during the reciprocating motion of the armature 31.

[0048] A locking portion 312 is provided on the outer side of the armature 31 away from the upper cavity 121. Preferably, the locking portion 312 is a stepped surface on the outer side of the armature 31. The first sealing valve 32 is provided with a snap-fit ​​structure 321 that can engage with the locking portion 312. For example, four snap-fit ​​structures 321 can be provided. The snap-fit ​​structures 321 engage with the locking surface to achieve a fixed connection between the armature 31 and the first sealing valve 32.

[0049] When the electromagnetic coil 24 is energized, the armature 31 rises under the electromagnetic force of the electromagnetic coil 24 assembly 20, and drives the first sealing valve 32 to rise. The first sealing surface at the lower part of the first sealing valve 32 opens the first opening 123, and the upper cavity 121 and the lower cavity 122 are connected, thereby allowing the pressure at the oil tank end to be quickly released to the carbon canister side.

[0050] Valve assembly 30 also includes a first spring 34, one end of which abuts against the upper housing 11 and the other end of which abuts against the first sealing valve 32, thereby pressing the first sealing surface of the first sealing valve 32 against the first opening 123.

[0051] Specifically, as shown in the figure, the lower part of the upper housing 11 is also provided with guide ribs connecting the first annular rib 111 and the second annular rib 112. An arc-shaped transition surface is provided on the side of the guide rib near the second annular rib 112. Optionally, six or eight guide ribs can be provided, evenly distributed between the first annular rib 111 and the second annular rib 112, thereby forming a receiving space for accommodating the end of the first spring 34. During assembly, one end of the first spring 34 slides into the receiving space through the arc-shaped transition surface of the guide rib and abuts against the end face of the first annular rib 111; this helps improve the assembly stability of the first spring 34.

[0052] Furthermore, a spring abutment portion can be formed on the end face of the first annular rib 111 of the upper housing 11. One end of the first spring 34 abuts against the spring abutment portion. Optionally, the spring abutment portion can be, for example, an arc-shaped groove to facilitate contact with the cross-section of the spring. This arrangement helps to improve the assembly speed of the first spring 34 and its stability during use.

[0053] The second sealing valve 33 includes a first end 331, a second end 332, and a connecting section 333 connecting the first end 331 and the second end 332. The first end 331 can pass through the second opening and enter the second receiving cavity. The side of the second end 332 near the first end 331 elastically abuts against the first sealing surface. At least one vent groove 3331 is recessed on the connecting section 333, forming a pressure relief channel between the vent groove 3331 and the second opening. The vent groove 3331 allows the pressure inside the oil tank to be transmitted to the sealing surface of the second sealing valve 33. Preferably, for example, two vent grooves 3331 can be provided, symmetrically arranged on the connecting section 333 at a 180-degree interval, which facilitates the uniform distribution of pressure inside the oil tank on the upper sealing surface.

[0054] Specifically, the valve assembly 30 also includes a limiting ring 35 and a second spring 36, wherein the limiting ring 35 is detachably connected to the second sealing valve 33, the limiting ring 35 is sleeved on the connecting section 333, one end of the second spring 36 abuts against the limiting ring 35, and the other end of the second spring 36 abuts against the first sealing valve 32, thereby abutting the side of the second end 332 near the first end 331 against the second opening.

[0055] The limiting ring 35 is configured to have an extension extending from the first end 331 to the second end 332. The side wall of the limiting ring 35 is provided with an installation opening 351. The connecting section 333 is provided with a flat part 3332 for installing the limiting ring 35. The flat part 3332 can pass through the installation opening 351 so that the limiting ring 35 can be sleeved on the connecting section 333 at the flat part 3332.

[0056] Specifically, the limiting ring 35 has a circular hole structure at its center. When the mounting opening is fully inserted into the flat part 3332, the limiting ring 35 moves upward under the action of the second spring 36 and abuts against the lower surface of the first end 331. Since the outer diameter of the first end 331 is larger than the outer diameter of the connecting section 333, the limiting ring 35 can be prevented from coming out.

[0057] To facilitate the installation and positioning of the second spring 36, the first sealing valve 32 is provided with an inverted frustum-shaped spring abutment on the side away from the lower cavity 122, so that one end of the second spring 36 can abut in the spring abutment and the other end of the second spring 36 abuts in the extension. This arrangement is beneficial for the assembly and positioning of the second spring 36 and also helps to improve the stability of the spring.

[0058] In one embodiment of this utility model, a rubber seal is detachably connected to the end of the first sealing valve 32 away from the armature 31. The rubber seal has an annular structure with a central opening that communicates with a second opening. The rubber seal has a first sealing portion and a second sealing portion centered on the central opening, arranged in an annular shape. The inner diameter of the first sealing portion is larger than that of the second sealing portion. The first sealing portion abuts against the inner wall of the upper cavity 121 to seal the first opening 123, and the second sealing portion abuts against the second sealing valve 33 to seal the second opening. Thus, by using a single rubber seal, the first opening 123 and the second opening can be sealed separately, reducing the number of components and lowering processing costs.

[0059] The integrated high-pressure isolation valve for vehicles provided by this utility model has three working conditions during use: refueling, depressurization, and air replenishment.

[0060] In the refueling operation, the solenoid valve assembly 20 is energized, and the armature 31, 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 fuel tank is released quickly; the gas flow direction is: fuel tank - fuel tank isolation valve - carbon canister; the electromagnetic force needs to overcome the pressure of the fuel tank pressure acting on the valve assembly and the spring force of the first spring 34, so that the rubber seal at the front of the first sealing valve 32 is disengaged from the sealing step surface on the lower housing to achieve active pressure relief;

[0061] The pressure relief condition is when the vehicle has been parked for a long time, and the gasoline in the fuel tank continues to evaporate 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 second sealing valve opens under the action of air pressure, completing the passive pressure relief and keeping the pressure in the fuel tank within a safe range. The gas flow direction is: fuel tank - fuel tank isolation valve - carbon canister. The opening pressure limit is set as needed, and the stiffness of the second spring is adjusted accordingly.

[0062] The air replenishment condition is when the vehicle engine runs for a long time, and negative pressure is generated in the fuel tank. When the negative pressure reaches a certain limit, the valve assembly opens upward under the action of the positive pressure at the carbon canister end, completing the air replenishment to the fuel tank. The gas flow direction is: carbon canister - fuel tank isolation valve - fuel tank. The opening pressure limit is set as needed by the first spring stiffness.

[0063] The integrated automotive high-pressure isolation valve provided by this utility model uses a floating connection armature 31 to replace the original valve assembly 30 with a central guide shaft. This avoids the influence of assembly dimension chain and assembly process on the guiding accuracy of the traditional central guide shaft, thus reducing the difficulty and cost of the process. At the same time, by setting a second sealing valve 33 in the second receiving cavity, and making one end of the second sealing valve 33 elastically abut against the first sealing surface, the second opening is sealed, thereby integrating the OVR valve (over-vacuum release valve) and the OPR valve (over-pressure release valve) into a whole. The overall structure is simple and easy to assemble. With the flow cross-sectional area unchanged, the flow capacity is strengthened and the pressure drop is reduced. At the same time, the pressure-bearing area of ​​the OVR valve is small, the electromagnetic force requirement is smaller, and the product is more compact.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An integrated high pressure isolation valve for vehicles, characterized in that, include: The housing includes an upper housing and a lower housing, the lower end of the lower housing is connected to the upper housing, the lower housing has an upper cavity and a lower cavity, and the upper cavity and the lower cavity are connected through a first opening; An electromagnetic coil assembly is located inside the upper housing, and a first receiving cavity is formed on the side of the electromagnetic coil assembly near the first opening; A valve assembly, at least a portion of which is located within the upper cavity and capable of reciprocating under the drive of an electromagnetic coil assembly, to open or close the first opening. The valve assembly includes an armature, a first sealing valve, and a second sealing valve. The end of the armature near the electromagnetic coil assembly is located within the first receiving cavity and is floatingly connected to the first receiving cavity. The armature reciprocates within the first receiving cavity under the action of the electromagnetic coil assembly. The end of the armature away from the electromagnetic coil assembly is connected to the first sealing valve. A second receiving cavity is formed between the armature and the first sealing valve. The end of the first sealing valve away from the armature is provided with a first sealing surface for sealing the first opening. The first sealing valve is also provided with a second opening connecting the second receiving cavity and the lower cavity. At least a portion of the second sealing valve passes through the second opening and enters the second receiving cavity. At least a portion of the second sealing valve elastically abuts against the first sealing surface to seal the second opening. The electromagnetic coil assembly includes a coil protective shell, a coil frame, an electromagnetic coil, and a fixed iron core. The coil frame is disposed inside the coil protective shell, the electromagnetic coil is wound around the coil frame, and the fixed iron core is inserted into the electromagnetic coil. The electromagnetic coil assembly also includes a metal guide sleeve, which is a cylindrical structure with one end open. The metal guide sleeve is located between the coil frame and the fixed iron core and forms the first receiving cavity.

2. The integrated high pressure isolation valve for vehicles according to claim 1, characterized by The coil protective shell at least partially surrounds the electromagnetic coil. The coil protective shell includes an inner shell, an outer shell, and a bottom shell. The bottom shell connects the inner shell and the outer shell. At least a portion of the inner shell is located between the electromagnetic coil and the metal conductor sleeve.

3. The integrated high pressure isolation valve for vehicles according to claim 1, characterized by, The metal guide sleeve includes: The guide sleeve body is a cylindrical structure with one end open; An inverted buckle structure is provided at the open end of the guide sleeve body. The inverted buckle structure includes a flange and a bent portion. The flange extends from the open end of the guide sleeve body to both sides and is arranged in a ring shape. The bent portion is bent from the edge of the flange in a direction away from the upper housing.

4. The integrated high pressure isolation valve for vehicles according to claim 3, characterized by The bottom of the guide sleeve body is also provided with an avoidance groove.

5. The integrated high pressure isolation valve for vehicles according to claim 1, characterized by The armature has a blind hole at the end away from the first sealing valve. The armature also includes a rubber pad with a T-shaped structure, one end of which is movably connected to the blind hole.

6. The integrated high pressure isolation valve for vehicles according to claim 1, characterized in that, The valve assembly further includes a first spring, one end of which abuts against the electromagnetic coil assembly, and the other end of which abuts against the first sealing valve, thereby pressing the first sealing surface of the first sealing valve against the first opening.

7. The integrated high pressure isolation valve for vehicles according to claim 1, characterized in that, The outer side of the armature away from the upper cavity is provided with a clamping part, and the first sealing valve is provided with a buckle structure capable of being clamped and connected with the clamping part.

8. The integrated high pressure isolation valve for vehicles according to claim 1, characterized in that, The second sealing valve comprises a first end, a second end and a connecting segment connecting the first end and the second end, the first end is capable of passing through the second opening into the second containing cavity, the side of the second end close to the first end elastically abuts against the first sealing surface, and at least one ventilation groove is arranged in the connecting segment in a recessed manner, and a pressure relief channel is formed between the ventilation groove and the second opening.

9. The integrated high pressure isolation valve for vehicle according to claim 8, characterized by, The valve assembly further comprises a limiting ring and a second spring, the limiting ring is detachably connected with the second sealing valve, the limiting ring is sleeved on the connecting segment, one end of the second spring abuts against the limiting ring, and the other end of the second spring abuts against the first sealing valve, so that the side of the second end close to the first end abuts against the second opening.

10. The integrated high pressure isolation valve for vehicle according to claim 8, characterized by, The end of the first sealing valve away from the armature is detachably connected with a rubber sealing piece, the rubber sealing piece is provided with a first sealing part and a second sealing part arranged in a ring shape, the inner diameter of the first sealing part is greater than that of the second sealing part, the first sealing part abuts against the inner wall of the upper cavity to seal the first opening, and the second sealing part abuts against the second sealing valve to seal the second opening.

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