Fuel tank valve assembly

Abstract

The valve assembly includes a housing having an inner chamber, a float assembly disposed within the inner chamber, and an elongated membrane. The inner chamber is provided with an exhaust orifice in fluid communication with the exhaust port. The float assembly is movable along the longitudinal axis of the housing and includes an angled platform disposed on an upper surface of the float assembly. The membrane includes a first end secured to a first mounting portion of the float assembly, a second end opposite the first end and secured to a second mounting portion of the float assembly, and a slack portion associated with the second end.

Description

Technical Field

[0001] Priority This application claims the benefit of U.S. Patent Law Section 119(a) with respect to Indian Patent Application No. 202311003998, filed on January 20, 2023, which is incorporated herein by reference.

[0002] The field of the present invention generally relates to vehicle fuel storage systems, and more specifically to devices that enable safe discharge of fuel vapor while preventing unintended leakage of liquid fuel.

Background Art

[0003] Vehicle fuel tanks require systems and devices that enable safe and consistent operation under various conditions. Considering the high flammability and energy density of fuel, the reliable performance of these safety systems is particularly important.

[0004] For example, a safety system is needed to ensure that the vapor released from the liquid fuel stored in the tank is safely discharged without increasing the pressure inside the fuel tank. For example, an increase in ambient temperature and / or strong solar radiation can raise the temperature of the fuel tank and its contents, increasing the rate of fuel vapor generation.

[0005] As another example, when a device or function is provided that can safely discharge the vapor of liquid fuel from the tank, an additional safety function is needed to prevent the vapor discharge path from functioning as a liquid fuel discharge path, i.e., to prevent unintended leakage. For example, if the tank is overfilled during refueling, the liquid fuel level may leak from the path intended for fuel vapor discharge unless the risk is predicted and mitigated.

[0006] As a further example, if the fuel vapor release passage is sealed against leakage based on an overfill event, the safety feature design described above must ensure that the full functionality of the safety system (fuel vapor release, etc.) is quickly restored when the fuel level subsequently drops or when normal operating conditions are restored. [Overview of the project]

[0007] This disclosure relates to features of an invention that enable and improve performance related to the safe discharge of fuel vapors from a vehicle's fuel tank and sealing against liquid fuel leakage.

[0008] In a particular embodiment that can combine some or all of the features of the above embodiments, the valve assembly is a housing having an inner chamber, the upper surface of the inner chamber having an exhaust orifice that communicates with an exhaust port and fluid; a float assembly provided within the inner chamber, the float assembly being movable along the longitudinal axis of the housing, the float assembly including a platform positioned on the upper surface of the float assembly, the platform being angled with respect to a plane perpendicular to the longitudinal axis; and a first mounting portion of the float assembly being formed elongated along the longitudinal axis. A membrane comprising a defined first end, a second end provided on the opposite side of the first end and fixed to a second mounting portion of the float assembly, and a slack portion associated with the second end; wherein, corresponding to the uppermost position of the float assembly along the longitudinal axis, the membrane is configured to cover and seal an exhaust orifice, at least a portion of the membrane is supported by a platform, and based on the movement of the float assembly away from the uppermost position, the membrane is configured to reopen the exhaust orifice, the reopening associated with the first end initiating the membrane to detach from the exhaust orifice, and at least a portion of the slack portion of the membrane includes curvature around an axis perpendicular to the longitudinal axis of the membrane.

[0009] In certain embodiments, which can combine some or all of the features of the above embodiments, the exhaust orifice includes an elongated section aligned with the longitudinal axis of the membrane. In certain embodiments, which can combine some or all of the features of the above embodiments, the slack portion of the membrane facilitates sealing of the exhaust orifice by facilitating alignment and restraint of the membrane relative to the exhaust orifice. In certain embodiments, which can combine some or all of the features of the above embodiments, the top surface of the platform includes a cavity.

[0010] In certain embodiments, which can combine some or all of the features of the above embodiments, the cavity includes an elongated section aligned with the longitudinal axis of the platform. In certain embodiments, which can combine some or all of the features of the above embodiments, the cavity includes a projecting ridge facing along the longitudinal axis of the platform.

[0011] In certain embodiments, which can combine some or all of the features of the above embodiments, the platform includes channels or grooves provided on the periphery of the cavity. In certain embodiments, which can combine some or all of the features of the above embodiments, the float assembly further includes a hollow core section. In certain embodiments, which can combine some or all of the features of the above embodiments, the hollow core section of the float assembly is slidably coupled to the housing of the valve assembly.

[0012] In a particular embodiment, which can combine some or all of the features of the above embodiments, the first mounting portion is offset from the second mounting portion along the longitudinal axis, and the first mounting portion is offset toward the upper surface of the inner chamber relative to the second mounting portion. In a particular embodiment, which can combine some or all of the features of the above embodiments, the platform is angled at an angle between 5° and 30° with respect to a plane perpendicular to the longitudinal axis.

[0013] In certain embodiments, which can combine some or all of the features of the above embodiments, the membrane comprises a fluoroelastomer. In certain embodiments, which can combine some or all of the features of the above embodiments, the fluoroelastomer is reinforced with one or more polymers. In certain embodiments, which can combine some or all of the features of the above embodiments, at least a portion of the membrane is sandwiched between the platform and the exhaust orifice, corresponding to the uppermost position of the float assembly, to seal the exhaust orifice.

[0014] In a particular embodiment, which can combine some or all of the features of the above embodiments, the valve assembly includes a clip fastener for securing at least one of the first or second ends of the membrane to the respective mounting portion of the float assembly. In a particular embodiment, which can combine some or all of the features of the above embodiments, the clip fastener includes a post configured to operatively couple with the float assembly.

[0015] In a particular embodiment, which can combine some or all of the features of the above embodiments, the membrane includes at least one through-hole configured to engage with a post. In a particular embodiment, which can combine some or all of the features of the above embodiments, the clip fastener includes one or more hooks or notches configured to operatively connect with the float assembly.

[0016] In a particular embodiment, which can combine some or all of the features of the above embodiments, the valve assembly system includes: a first valve assembly; a second valve assembly in fluid communication with the first valve assembly; and an exhaust port in fluid communication with the first valve assembly, wherein the first valve assembly is a housing having an inner chamber, the upper surface of the inner chamber having an exhaust orifice in fluid communication with the exhaust port; and a float assembly provided within the inner chamber, the float assembly being movable along the longitudinal axis of the housing, the float assembly including a platform positioned on the upper surface of the float assembly, the platform being angled with respect to a plane perpendicular to the longitudinal axis, A membrane is included, which is elongated along the longitudinal axis and includes a first end fixed to a first mounting portion of the float assembly, a second end provided on the opposite side of the first end and fixed to a second mounting portion of the float assembly, and a slack portion associated with the second end; the membrane is configured to cover and seal an exhaust orifice corresponding to the uppermost position of the float assembly along the longitudinal axis, at least a portion of the membrane is supported by the platform, and the membrane is configured to reopen the exhaust orifice based on the movement of the float assembly away from the uppermost position, the reopening associated with the first end initiating the membrane to peel away from the exhaust orifice, and at least a portion of the slack portion of the membrane includes curvature around an axis perpendicular to the longitudinal axis of the membrane.

[0017] In a particular embodiment that can combine some or all of the features of the above embodiments, a method for assembling a valve assembly includes: providing a float assembly within a housing of a valve assembly, based on slidably coupling a core section of a float assembly to one or more guide structures of the housing; providing a platform on the upper surface of the float assembly, the platform being angled with respect to a plane perpendicular to the longitudinal axis of the housing; securing a first end of a membrane to a first mounting portion of the float assembly, the membrane being elongated along a longitudinal axis, and configured to cover and seal an exhaust orifice corresponding to the uppermost position of the float assembly along the longitudinal axis, with at least a portion of the membrane being supported by the platform; and securing a second end of the membrane to a second mounting portion of the float assembly, the slack portion of the membrane being associated with the second end, and at least a portion of the slack portion of the membrane including curvature around an axis perpendicular to the longitudinal axis of the membrane.

[0018] In certain embodiments, which can combine some or all of the features of the above embodiments, a flexible ribbon is provided, along with a slanted lower surface of the valve orifice and a corresponding slanted ramp on the float, to seal the valve orifice against liquid fuel leakage.

[0019] In a particular embodiment that can combine some or all of the features of the above embodiments, both ends of the flexible ribbon are joined to the upper surface of the float at their respective ribbon attachment points.

[0020] In a particular embodiment that can combine some or all of the features of the above embodiments, the upper end of the ribbon is connected to the upper ribbon attachment portion of the float, and the lower end of the ribbon is connected to the lower ribbon attachment portion of the float.

[0021] In a particular embodiment that can combine some or all of the features of the above embodiments, ribbon slack is incorporated at the lower end of the ribbon.

[0022] In certain embodiments that can combine some or all of the features of the above embodiments, the ribbon slack includes a loop.

[0023] In certain embodiments that can combine some or all of the features of the above embodiments, the loop of the ribbon loops downward from the rest of the ribbon.

[0024] In certain embodiments that can combine some or all of the features of the above embodiments, the surface of the valve orifice that engages the ribbon is elliptical, oval, or racetrack-shaped.

[0025] In certain embodiments that can combine some or all of the features of the above embodiments, the ribbon interface of the float's inclined ramp includes a cavity.

[0026] In certain embodiments that can combine some or all of the features of the above embodiments, the cavity of the ribbon interface corresponds to the shape of the surface of the valve orifice that engages the ribbon.

[0027] In certain embodiments that can combine some or all of the features of the above embodiments, the ribbon interface on the float's inclined ramp includes one or more raised portions.

[0028] In certain embodiments that can combine some or all of the features of the above embodiments, the ribbon interface on the float's inclined ramp includes one or more cutouts.

[0029] In certain embodiments that can combine some or all of the features of the above embodiments, the ribbon is made of a fluorine elastomer.

[0030] In certain embodiments that can combine some or all of the features of the above-described embodiments, the fluorine elastomer material of the ribbon is further strengthened with a polymer.

Brief Description of the Drawings

[0031] Hereinafter, the present invention will be described in more detail based on exemplary drawings. The present invention is not limited to the exemplary embodiments. Other features and advantages of various embodiments of the present invention will become apparent by reading the following detailed description while referring to the accompanying drawings shown below. [Figure 1] It is a schematic side cross-sectional view showing a valve assembly system according to a specific embodiment. [Figure 2] It is a schematic exploded view showing specific components of a valve assembly according to a specific embodiment. [Figure 3A] It is a schematic top perspective view of a valve assembly housing according to a specific embodiment. [Figure 3B] It is a schematic top view of a valve assembly housing according to a specific embodiment. [Figure 3C] It is a schematic top view of the inner chamber of a valve assembly housing according to a specific embodiment. [Figure 4] It is a schematic perspective view of a float assembly and a ribbon according to a specific embodiment. [Figure 5] It is a schematic front cross-sectional view of a valve assembly according to a specific embodiment, and is a schematic view and an enlarged insertion view showing the state where the float assembly is approaching the upper limit. [Figure 6] It is a schematic partial side cross-sectional view of a valve assembly according to a specific embodiment. [Figure 7] It is a schematic top perspective view of a float assembly with the ribbon removed for the purpose of explanation according to a specific embodiment. [Figure 8] It is a schematic partially enlarged front perspective view of a float assembly with the ribbon removed according to a specific embodiment. [Figure 9A]This is a schematic side cross-sectional view of a float assembly with a ribbon attached, according to a specific embodiment. [Figure 9B] This is a schematic side view of a float assembly with a ribbon attached, according to a specific embodiment. [Figure 9C] This is a schematic front perspective view of a float assembly with a ribbon attached, according to a specific embodiment. [Figure 10A] This is a schematic side cross-sectional view of a float assembly with a ribbon attached, according to a specific embodiment. [Figure 10B] This is a schematic rear view of a float assembly with a ribbon attached, according to a specific embodiment. [Figure 10C] This is a schematic front view of a float assembly with a ribbon attached, according to a specific embodiment, with an inset showing a perspective view of the ribbon attachment clip. [Figure 11A] This is a schematic perspective view of a float assembly with a ribbon attached, according to a specific embodiment. [Figure 11B] This is a schematic perspective view of a ribbon attachment clip according to a specific embodiment. [Figure 12] This is a schematic partial side cross-sectional view of a float assembly with a ribbon attached, according to a specific embodiment. [Modes for carrying out the invention]

[0032] To facilitate a better understanding of this disclosure, examples of specific embodiments are given below. These examples should not be construed as limiting or defining the scope of this disclosure. Various mechanisms, assemblies, arrangements, and methods of assembly, manufacture, and / or operation of exhaust valves for fuel tank systems are disclosed herein in accordance with various embodiments of this disclosure.

[0033] Referring to the figure, Figure 1 is a schematic side cross-sectional view showing a valve assembly system according to a particular embodiment. In a particular embodiment, the valve assembly system may include one or more valve assemblies. In a particular embodiment, the valve assembly system 10 may include valve assembly 100. In a particular embodiment, the valve assembly system 10 may include multiple valve assemblies, such as valve assembly 20 and valve assembly 100. As an example, not an limitation, the valve assembly system may include a compact combo valve. As an example, not an limitation, the valve assembly may include a graded exhaust valve (GVV). As an example, not an limitation, the valve assembly may include a fill limiting valve (FLV).

[0034] In certain embodiments, the base 30 of the valve assembly system 10 and / or valve assembly 100 may be fluidly connected to the fluid contents of the tank, such as the surface of the liquid contents of the tank. In certain embodiments, the tank may be configured as a fuel tank. In certain embodiments, the base 30 may enable fluid communication between the contents of the tank and the valve assembly system 10 and / or valve assembly 100. In certain embodiments, the valve assembly system 10 and / or valve assembly 100 may be provided with an outlet port 40. In certain embodiments, the outlet port 40 may be located on the top of the valve assembly system 10 and / or valve assembly 100, as shown in Figure 1 as a non-limiting example. As an example, not limiting, the outlet port 40 may be an outlet conduit for fuel vapors released from the tank.

[0035] For illustrative purposes only, this disclosure may describe details of a specific exhaust assembly (such as a grade exhaust valve) in the context of an exemplary valve assembly 100, but this disclosure fully assumes any suitable valve assembly 100 based on the structure and / or function disclosed. For illustrative purposes only, details of the internal structure of a fill limiting valve or any other suitable valve are omitted here for clarity, but it should be understood that the valve assembly 100 disclosed herein can be deployed alone or in combination with other suitable valve assemblies as part of a valve assembly system 10.

[0036] Figure 2 is a schematic exploded view showing specific components of a valve assembly according to a particular embodiment. In a particular embodiment, the valve assembly 100 may include a housing 200 having a longitudinal axis LL. In a particular embodiment, the housing 200 may include a valve orifice 220 at one end of the housing 200. In a particular embodiment, the housing 200 may surround or house an inner chamber 230. In a particular embodiment, an exhaust orifice 220 may be provided on the upper surface of the inner chamber 230. In a particular embodiment, the valve orifice 220 may be in fluid communication with an exhaust port 40.

[0037] In certain embodiments, the valve assembly 100 may include a float assembly 300. In certain embodiments, the float assembly 300 may be movable along a longitudinal axis LL. In certain embodiments, the valve assembly 100 may include an end cap 400 at the base end of the housing 200. In certain embodiments, the side of the housing 200 opposite to the base end of the housing 200 may include the upper side of the housing 200. In certain embodiments, the meaning of “upper” in the context of this disclosure may be aligned with the direction of movement of the movable float assembly 300 within the housing 200, opposite to the base end of the housing 200. In certain embodiments, a valve orifice 220 may be located at or near the upper end of the housing 200 and / or the valve assembly 100. In certain embodiments, the valve assembly 100 may include one or more gaskets, O-rings, seals, labyrinths, and / or other suitable structures for sealing and / or containing the fluid flow, such as an O-ring 410. In certain embodiments, the valve assembly 100 may include one or more biasing members, such as a spring 420. In certain embodiments, a membrane, such as a ribbon 320, may be attached to the float assembly 300, as will be further described herein.

[0038] Figure 3A is a schematic top perspective view of a valve assembly housing according to a particular embodiment. Figure 3B is a schematic top view of a valve assembly housing according to a particular embodiment. Figure 3C is a schematic top view of the inner chamber of a valve assembly housing according to a particular embodiment.

[0039] In certain embodiments, the outer end 222 of the valve orifice 220 on the housing 200 may have a circular or substantially circular orifice shape. In certain embodiments, the baffle or surrounding enclosure of the valve orifice 220 on the outer surface of the housing 200 may have a kidney shape. In certain embodiments, the valve orifice 220 on the outer surface of the housing 200 may be configured to house a valve such as a ball valve or a disc valve. As an example, but not an limitation, Figure 1 shows a ball valve 50 assembled in the valve orifice 220 of a valve assembly 100. In certain embodiments, the inner end 224 of the valve orifice 220 on the housing 200, as viewed from inside the inner chamber 230 of the housing 200, may have an elongated, elliptical, oblong, and / or racetrack shape.

[0040] In certain embodiments, the shape of the outer end 222 of the valve orifice 220 may be designed to facilitate effective coupling and interaction with the valve mechanism described above. In certain embodiments, the shape of the inner end 224 of the valve orifice 220 may be designed to facilitate effective coupling and interaction with the ribbon 320. In certain embodiments, a valve orifice 220 provided within a housing 200 may transition between the different shapes of the outer end 222 and the inner end 224 within the upper section of the housing 200 and / or along the longitudinal axis. In certain embodiments, the valve orifice 220 may transition within the housing 200 from a substantially circular outer end 222 to an elongated inner end 224. In certain embodiments, the valve orifice 220 may transition from a valve-facing opening on the upper surface of the valve orifice 220, which is substantially circular or other suitable shape, to a ribbon-facing opening on the lower surface of the valve orifice 220, which is substantially elliptical, oblong, racetrack-shaped, or other suitable shape. In certain embodiments, the valve orifice 220 may include an elongated section aligned with the longitudinal axis of the ribbon 320. In certain embodiments, a substantially circular and / or nearly circular shape may have a circumference in which at least half of its length or range is part of a circle.

[0041] In certain embodiments, the float assembly 300 is slidably connected to the housing 200 and, for example, movable along the longitudinal axis LL within the housing 200. In certain embodiments, one or both of the housing 200 and / or the float assembly 300 may be provided with suitable structures to facilitate the interconnection, constraint, and / or relative movement of the float assembly 300 within the housing 200. In certain embodiments, the float assembly 300 and / or the housing 200 may be provided with guides, guide rails, and / or guide channels. In certain embodiments, the float assembly 300 may include a core, such as a central core, which may be hollow. In certain embodiments, such as those described and illustrated as non-limiting examples herein, such structures to facilitate the interconnection, constraint, and / or relative movement of the float assembly 300 within the housing 200 may be provided in or near the interface section associated with the central core and / or inner core of the float assembly 300. In addition, or instead, structures for facilitating the interconnection, restraint, and / or relative movement of the float assemblies 300 within the housing 200 may be provided on or near the outer circumferential interface. For example, but not limited, the housing 200 may include one or more float guides 260. For example, but not limited, the float assembly 300 may include one or more float guide channels 360. For example, but not limited, the central core 305 of the float assembly 300 may be configured to slidably engage with the central core 210 of the housing 200.

[0042] Figure 4 is a schematic perspective view of a float assembly and ribbon according to a particular embodiment. In a particular embodiment, the float assembly 300 may be provided or positioned within the housing 200 of the valve assembly 100, thereby allowing the float assembly 300 to translate along the longitudinal axis LL of the housing 200 and the valve assembly 100. Not limited to, but as an example, the float assembly 300 may translate or move within the housing 200 depending on the level of liquid fuel in a tank, such as a fuel tank. In a particular embodiment, the materials of the housing 200 and the float assembly 300 may be selected such that their relative interfaces have desired properties such as low friction and / or adequate clearance under various operating conditions.

[0043] In certain embodiments, the longitudinal axis LL of the valve assembly 100 and / or housing 200 may be substantially perpendicular to a tank located in a horizontal plane (such as a vehicle's fuel tank), but may not coincide with the perpendicular vector (i.e., parallel to the gravity vector) when the tank is located on an inclined or non-horizontal surface. As a non-limiting example, if a vehicle including the tank is parked or crossing an inclined surface, or if the vehicle is overturned, the longitudinal axis LL crossing the float assembly 300 may not align with the perpendicular vector. As an example and not a limitation, in such situations, the float assembly 300 may remain constrained within the housing 200. In certain embodiments, the float assembly 300 may be guided by float guides, e.g., one or more float guides 260 and / or one or more float guide channels 360, and may be translated along the longitudinal axis LL of the housing 200 based on the buoyancy component acting on the float assembly 300, etc. In certain embodiments, as shown in non-limiting examples in Figures 3C, 7, and 9C, the float guide 260 may be located on the housing 200 and engage with a corresponding float guide channel 360 located on the float assembly 300 to facilitate and selectively restrain the movement of the float assembly 300 within the housing 200.

[0044] Figure 5 is a schematic front cross-sectional view of a valve assembly according to a specific embodiment, showing an overview and an enlarged inset illustrating the float assembly approaching its upper limit.

[0045] As an example, not an limitation, an approximate path 250 for releasing fuel vapor from the tank through the valve assembly 100 is also shown. As an example, not an limitation, the position of the float assembly 300 along its longitudinal axis LL may be determined by the liquid level (liquid surface) (e.g., inside the fuel tank), as discussed above, but there may be a small clearance (e.g., a radial clearance along the approximate path 250) at the relative interface between the float assembly 300 and the housing 200. As an example, not an limitation, fuel vapor from the tank may flow through such a small clearance through the float assembly 300 and occupy the volume above the float assembly 300 in the inner chamber 230 of the housing 200. In certain embodiments, as described above, a valve mechanism such as a disc head valve or a ball valve may be located at the outlet of the valve orifice 220 in the housing 200. In certain embodiments, such a valve mechanism may be designed and tuned to open at a predetermined pressure level, such as to release accumulated fuel vapor from the outlet port 40. For example, and not an exhaustive one, a disc valve or ball valve may be designed to open at a vapor pressure exceeding 5 kPa to prevent the accumulation of pressure exceeding the designed opening pressure.

[0046] In certain embodiments, it may be desirable to close and seal the valve orifice 220 to prevent leakage of liquids such as liquid fuel. In non-limiting examples, it may be necessary to seal the valve orifice 220 to prevent leakage of liquid fuel due to overfilling of liquid fuel, inclination of the fuel tank on a slope, and / or vehicle rollover. Furthermore, in certain embodiments, it may be desirable to quickly restore the function of the vapor release passage through the valve orifice 220 after sealing the valve orifice 220. In certain embodiments, for example, the fluid flow through the valve orifice 220 can be restored by reopening the valve orifice 220 after the risk of liquid fuel leakage has decreased. In non-limiting examples, it may be desirable for the valve orifice 220 to be able to release fuel vapor again after the liquid fuel level has fallen to a safe lower limit level.

[0047] In certain embodiments, a membrane such as a ribbon 320 may be provided to seal the valve orifice. In certain embodiments, the membrane such as a ribbon 320 may be elongated along the longitudinal axis. In certain embodiments, the membrane such as a ribbon 320 may include a first end, a second end provided on the opposite side of the first end, and a slack portion associated with the second end. By example, not limiting, the ribbon 320 may operate based on the rise and / or movement within the float assembly 300, thereby causing the ribbon 320 to contact the valve orifice 220 in the housing 200. By example, not limiting, the ribbon 320 may be provided to seal the valve orifice 220, but may also be designed to open effectively and / or quickly ("open") to restore the opening of the valve orifice 220 (e.g., inner end 224), thereby restoring normal fluid discharge (e.g., fuel vapor discharge) function. For example, in some such embodiments, the effective opening and / or reopening of the ribbon 320 may depend on equalizing any fluid pressure differences that may exist (e.g., across the entire ribbon 320), but this difference may prevent the ribbon 320 from reopening. Thus, in certain embodiments, the interaction between the design and features of the ribbon 320, the float assembly 300, and / or the valve orifice 220 can control the effectiveness and performance of the sealing and reopening of the valve assembly 100. Relevant structural and functional aspects will be discussed further below.

[0048] In certain embodiments, the ribbon 320 may include a relatively flexible and durable member, membrane, or sheet necessary to ensure that the above functions of effective sealing and rapid re-opening are performed. In certain embodiments, the ribbon 320 may be relatively thin. As a non-limiting example, in certain embodiments, the ribbon 320 may include one or more materials, including synthetic rubber, fluoropolymer, fluorosilicone, and / or silicone rubber. In certain embodiments, the base material of the ribbon 320 may optionally be reinforced with additional materials such as polyester or other polymers.

[0049] Figure 6 is a schematic partial side cross-sectional view of a valve assembly according to a particular embodiment. In a particular embodiment, a platform such as a ramp 330 may be provided on the upper surface of the float assembly 300, for example. In a particular embodiment, the ramp 330 may support the ribbon 320 in the seated position and / or sealed position of the ribbon 320.

[0050] Figure 7 is a schematic top perspective view of a float assembly with the ribbon removed for illustrative purposes, according to a particular embodiment. Figure 8 is a schematic partially enlarged front perspective view of a float assembly with the ribbon removed, according to a particular embodiment.

[0051] In certain embodiments, the ribbon 320 may be coupled to the float assembly 300 at one or more ribbon attachment points provided on the float assembly 300. In addition or alternatively, one or more external attachment structures, such as fasteners and / or clips 356, may be used to couple one or more ends of the ribbon 320 to the float assembly 300 and / or housing 200.

[0052] For example, but not limited to, the ends of the ribbon 320 may be configured to be secured to two ribbon attachment points on the float assembly 300. According to a specific embodiment (not shown), one or both of the ribbon attachment points may be located on the housing rather than on the float. For example, but not limited to, one or more ends of the ribbon 320 may be located in through holes (e.g., through hole 326) for securing the ribbon 320 to the ribbon attachment points and / or the housing 200 provided on the float assembly 300.

[0053] Figures 9A to 9C schematically show a float assembly with a ribbon attached according to a particular embodiment. In a particular embodiment, the float assembly 300 may include a first ribbon attachment portion 352 and / or a second ribbon attachment portion 354, as shown in non-limiting examples in Figures 7 and 9. In a particular embodiment, the first ribbon attachment portion 352 may be offset from the second ribbon attachment portion 354 along the longitudinal axis LL. In a particular embodiment, the first ribbon attachment portion 352 may be offset relative to the second ribbon attachment portion 354 toward the upper surface of the inner chamber 230 and / or housing 200.

[0054] As shown in Figures 6 and 10A, in certain embodiments, the interface portion (e.g., inner end 224) of the valve orifice 220 located in the housing 200 can interface with and engage with the ribbon 320 when the valve orifice 220 is sealed by the ribbon 320. In certain embodiments, such interface portion (e.g., inner end 224) of the valve orifice 220 may also have a slope or gradient. By example, but not limited, the inner end 224 of the valve orifice 220, the ribbon 320, and / or the ramp 330 may be angled or inclined so that some or all of them align with each other in a sealed configuration. In certain embodiments, such mutual alignment may be configured such that the ribbon 320 is sandwiched and / or held in close contact between the corresponding angled surface of the valve orifice 220 and the angled ramp 330 of the float assembly 300 in an angled, inclined, and / or tilted orientation.

[0055] In certain embodiments, the ramp 330 is angled with respect to a plane perpendicular to the longitudinal axis LL. In certain embodiments, the ramp 330 is angled at an angle of 5° to 30° with respect to a plane perpendicular to the longitudinal axis LL. In certain embodiments, the ramp 330 is angled at an angle of 10° to 15° with respect to a plane perpendicular to the longitudinal axis LL.

[0056] Figure 10A is a schematic side cross-sectional view of a float assembly with a ribbon attached according to a particular embodiment. Figure 10B is a schematic rear view of a float assembly with a ribbon attached according to a particular embodiment. Figure 10C is a schematic front view of a float assembly with a ribbon attached according to a particular embodiment, with an inset showing a perspective view of the ribbon attachment clip.

[0057] In certain embodiments, as shown in non-limiting examples in at least Figures 6, 9A, 10A, and 11A, the first end of the ribbon 320 may be coupled to or otherwise secured to the first ribbon attachment 352 so as to be held in a relatively taut or stretched state at that position. In certain embodiments, the ribbon 320 may include a portion having ribbon slack 324 at or near the second end of the ribbon 320 opposite to the first end of the ribbon 320. In certain embodiments, the second end of the ribbon 320 may be coupled to or otherwise secured to the second ribbon attachment 354 so as to be positioned at or near the second ribbon attachment 354.

[0058] In certain embodiments, at least a portion of the ribbon slack 324 may be positioned at or near a ribbon attachment, such as a second ribbon attachment 354, as a curve and / or loop of the available ribbon length. In certain embodiments, as shown in non-limiting examples in Figures 6, 9A, 11A, and 12, the loop or curve associated with the ribbon slack 324 may curl or spiral downward from the main or remaining portion of the ribbon, or away from the valve orifice 220, before being coupled to the second ribbon attachment 354. In certain embodiments, the loop may curl upward from the main or remaining portion of the ribbon (not shown here) and / or towards the valve orifice 220 before being coupled to the second ribbon attachment 354.

[0059] In certain embodiments, as shown in at least Figures 7 and 8 as non-limiting examples, the ramp 330 of the float assembly 300 may be provided with a ribbon interface 310 for supporting the ribbon 320 in its seating and / or sealed positions. Not limiting, but as an example, the ribbon interface 310 may have a shape or form corresponding to the opening shape (e.g., inner end 224) of the valve orifice 220 facing the ribbon. In certain embodiments, the ribbon interface 310 of the float assembly 300 may include a cavity 312. In certain embodiments, one or more protruding protrusions, such as a ridge 340, may be provided within or near the ribbon interface 310. Not limiting, but as an example, the ridge 340 may provide rigidity to the ribbon 320 during the event that the ribbon 320 seats on the ramp 330 and / or seals the valve orifice 220. In certain embodiments, the raised portion 340 can thus suppress wrinkles, sagging, folding, and / or misalignment of the ribbon 320 relative to the ribbon interface 310, based on the desired configuration and interface of the ribbon 320. As an example, but not an limitation, the raised portion 340 can facilitate supporting and / or holding the ribbon 320 in alignment with the valve orifice 220 when the valve orifice 220 is sealed by the ribbon 320, preventing leakage of fluid through the valve orifice 220, and the ribbon 320 may be sandwiched between the valve orifice 220 and the ribbon interface 310, or appropriately held. As an example, but not an limitation, central raised portions 340 corresponding to the above description are shown at least in Figures 7 and 8. In certain embodiments, the raised portion 340 may be aligned along the longitudinal and / or axial direction of the ribbon 320, and / or along the longitudinal and / or axial direction of the ramp 330, and / or along the longitudinal and / or axial direction of the inner end 224 of the valve orifice 220.

[0060] As discussed, in certain embodiments, the function of the ribbon 320 may be to cover and / or seal the vapor release passage through the valve orifice 220. For example, but not limited to, the ribbon 320 may be configured to seal the valve orifice 220 when the float assembly 300 moves to its upper limit due to the liquid fuel level, thereby preventing unintended leakage of liquid fuel through the valve orifice 220. For example, but not limited to, during operation, the float assembly 300 rises in response to the rising liquid fuel level, thereby allowing the upper surface of the ribbon 320 to engage with the inner end 224 of the valve orifice 220 located in the housing 200. Figure 6 shows, as an example rather than an limitation, a float assembly 300 with the ribbon 320 attached approaching its movable uppermost position, with the upper surface of the ribbon 320 seated, and the sealing valve orifice 220 about to close as the float assembly 300 gradually rises along its longitudinal axis LL to its uppermost position.

[0061] In certain embodiments, a relatively flexible and deformable membrane shape and / or material (e.g., ribbon 320) compared to a more rigid, hard, and / or stiff material can be further compressed as the float assembly 300 moves up along LL to improve the seal around the inner end 224 of the valve orifice 220.

[0062] As already discussed, in certain embodiments, the ribbon 320 may be designed to quickly restore the fluid flow function of the valve orifice 220, such as when fuel vapor release occurs, for example, when the liquid fuel level drops, thereby allowing the float assembly 300 to move below its previous highest point or limit. In certain embodiments, in such non-limiting scenarios, it may be desirable for the longitudinal movement of the float assembly 300 to quickly follow and approach the currently dropping liquid level (e.g., liquid fuel), thereby effectively and quickly exposing the valve orifice 220 (e.g., vapor release valve passage) and restoring its ability to release unwanted fuel vapor. However, in the absence of certain features discussed and disclosed herein, the float assembly 300 may not be able to easily retract (e.g., downward) from its highest point based on a drop in liquid level (e.g., liquid fuel level in a tank). As an example, not an limitation, the possibility that downward movement of the float assembly 300 may be potentially difficult or resistant may occur in certain cases and embodiments. This is because the instantaneous fluid pressure in the inner chamber 230 of the housing 200, located above the float assembly 300, tends to decrease based on the initial volume expansion of the inner chamber 230. Thus, as a non-limiting example, the corresponding pressure drop above the float assembly 300 may prevent the float assembly 300 from moving away from its top (e.g., downward) based on the relative pressure difference formed across the top surface of the float assembly 300 (i.e., between the top and bottom). Separately or in addition to this, the relative pressure conditions within the valve orifice 220 (e.g., within the fuel vapor release passage) may tend to keep the ribbon 320 closed after it has initially closed and sealed against the valve orifice 220.In such situations, it may be desirable, for example, that the ribbon 320 be reopened in a planned (i.e., by design) and prompt manner, thereby equalizing the pressure above and below the ribbon 320 and / or the overall pressure of the float assembly 300, and that the float assembly 300 move in conjunction with the decrease in the liquid level, thereby exposing the valve orifice 220 and the corresponding vapor release passage.

[0063] In certain embodiments, based on the seating and / or sealed position of the ribbon 320, the lower surface of the ribbon 320 may be fully seated on the angled ramp 330 of the float assembly 300. In certain embodiments, separately or additionally, the upper surface of the ribbon 320 may be held in a sealed state against the similarly angled or inclined inner end 224 of the valve orifice 220. In certain embodiments, as shown at least in Figures 7 and 8, air venting or other gas venting in a cavity 312 located at the ribbon interface 310 of the ramp 330 is used, for example, for a tighter seating and / or seal. In certain embodiments, one or more protrusions, such as a ridge 340, can prevent the ribbon 320 from collapsing into the cavity 312 of the ribbon interface 310, etc. In certain embodiments, the cavity 312 may include an elongated section aligned with the longitudinal or axial direction of the ramp 330 and / or ribbon 320.

[0064] In certain embodiments, the first end of the ribbon 320 may be associated with an upper attachment (e.g., a first ribbon attachment 352). In certain embodiments, the second end of the ribbon 320 may be associated with a lower attachment (e.g., a second ribbon attachment 354). Furthermore, in certain embodiments, a ribbon slack 324 may be provided at the second end of the ribbon 320. In certain embodiments, the ribbon slack 324 may be spiral or loop-shaped (upward or downward) along an axis perpendicular to the longitudinal axis of the elongated range of the ribbon 320.

[0065] In certain embodiments, if a liquid level associated with the valve assembly 100, such as the liquid level of a fuel tank, first drops below the level corresponding to the top of the float assembly 300, the resultant force acting on the float assembly 300 (e.g., a downward force and / or a force away from the top) may first act on the ribbon 320 at the relatively taut first end of the ribbon 320 fixed to the first ribbon attachment 352. In certain embodiments, ribbon slack 324 provided at or near a relatively low ribbon attachment (e.g., a second ribbon attachment 354) can prevent the resultant force from first acting on the ribbon 320 at the second end of the ribbon 320. As a result, in certain embodiments, the first (upper) end of the inclined seated ribbon 320 is effectively and rapidly pulled away from the valve orifice 220 by the resulting peeling action or effect, thereby rapidly neutralizing a pressure difference that could hinder effective movement of the float assembly 300 away from its top (e.g., downward movement) along the longitudinal axis LL of motion. In certain embodiments, as the movement of the float assembly 300 away from its top continues, the ribbon 320 is temporarily lifted above the ramp 330 of the float assembly 300, so the second (lower) end of the ribbon may temporarily lose some of the slack represented by the ribbon slack 324.

[0066] In certain embodiments, as discussed above, the ribbon slack 324 may facilitate the quick and effective reopening of the valve orifice 220. However, by providing the ribbon slack 324 at the second end of the ribbon 320, which is configured as one or more well-formed ribbon loops, in certain embodiments, additional or alternative benefits related to the sealing of the valve orifice 220 by the ribbon 320 may also be provided. As an example, but not an limitation, based on the disclosed shape and / or material of the ribbon 320, and the shape of one or more loops, the ribbon slack portion 324 may function as a tensile spring that stiffens the ribbon 320 when the ribbon 320 lifts the inclined ramp 330 of the float assembly 300, thereby preventing wrinkles, sagging, folding, other undesirable deformations or displacements of the float assembly 300. For example, but not limited to, if the fluid flow rate near the ribbon 320 is high, large pressures and / or forces may be generated based on their interactions and / or dynamics, thereby preventing the ribbon 320 from being displaced, misaligned, and / or otherwise positioned effectively relative to the valve orifice 220. In certain embodiments, the aforementioned beneficial aspects of the ribbon slack 324, including but not limited to the shape of one or more loops, can give rigidity to the ribbon 320. In certain embodiments, the aforementioned beneficial aspects of the ribbon slack 324 facilitate the ability to restrain and / or present the ribbon 320 in a flat and aligned state relative to the valve orifice 220, thereby improving the sealing performance of the ribbon 320 with respect to the valve orifice 220.

[0067] In certain embodiments, one or more channels, grooves, and / or notches, such as notch 314, may be provided in the ribbon interface 310. For example, not limiting, notch 314 can prevent air and / or other gases from becoming trapped in the cavity 312 of the ribbon interface 310. For example, in the absence of notch 314, a suction force or vacuum may form beneath the seated ribbon 320 within the ribbon interface cavity 312, thereby preventing the ribbon 320 from being quickly and effectively detached when the sealed configuration needs to be reopened.

[0068] Figure 11A is a schematic perspective view of a float assembly with a ribbon attached, according to a particular embodiment. Figure 11B is a schematic perspective view of a ribbon attachment clip, according to a particular embodiment. Figure 12 is a schematic partial side cross-sectional view of a float assembly with a ribbon attached, according to a particular embodiment.

[0069] In certain embodiments, the ribbon attachment portion may have a structure and shape for properly securing and restraining the ribbon, as described herein. In certain embodiments, the ribbon attachment portion may be configured separately or additionally, taking into consideration durability, ease of manufacture, and / or ease of assembly. In certain embodiments, the ribbon attachment portion may include, as a non-limiting example, one or more levers, clips, buttons, posts, split posts, notches, hinges, and / or snap fits. As a non-limiting example, Figures 7 and 9A show buttons provided on the float assembly 300 as a first ribbon attachment portion 352 and a second ribbon attachment portion 354, configured to engage with and secure each through-hole 326 of the ribbon 320. As an example, not limiting, Figures 10A–10C show certain embodiments of the clip 356. As an example, not limiting, Figures 11A–11B and 12 show certain embodiments of the clip 356.

[0070] In certain embodiments, the clip 356 may include one or more posts, such as a post 358. In certain embodiments, one or more posts of the clip 356 may be configured to pass through one or more through holes 326 of the ribbon 320. In certain embodiments, the clip 356 may include one or more mechanisms, such as a hook or latch 357, which can be configured to engage with the float assembly 300. In certain embodiments, the float assembly 300 may be provided with a suitable mechanism for engaging with each hook or latch 357 of each clip 356. In certain embodiments, the clip 356 may include one or more notch mechanisms, such as a notch 359.

[0071] The advantages and benefits of the concept of the present invention are considered to have been sufficiently demonstrated by considering the exemplary embodiments disclosed.

[0072] others The above description of embodiments is provided for illustrative and explanatory purposes only and is not exhaustive or limiting to the disclosure. Individual elements or features of a particular embodiment are not typically limited to that particular embodiment and, where applicable, may be interchangeable and usable in selected embodiments even if not specifically illustrated or described. For example, by combining each feature described in one example of an embodiment with one or more other desired features of other embodiments, other embodiments that are not described in words or by drawing reference but are well considered may be obtained. Furthermore, those skilled in the art will understand that changes and modifications can be made within the scope of this disclosure, illustrations, and / or claims. Such changes are well considered herein and should not be considered departures from the disclosure, and all such changes are intended to be within the scope of the disclosure.

[0073] The terms used in the claims should be interpreted in the broadest and most reasonable way that is consistent with the preceding explanation. For example, when the article “a” or “the” is used when introducing an element, it should not be interpreted as excluding multiple elements. Similarly, the wording “or” should be interpreted as inclusive, and the wording “A or B” does not exclude “A and B” unless it is clear from the context or the preceding explanation that only one of A and B is intended. Furthermore, the wording “at least one of A, B and C” should be interpreted as one or more elements in a group consisting of A, B and C, and should not be interpreted as requiring at least one of each of the enumerated elements A, B and C, regardless of whether A, B and C are related as categories. Furthermore, the wording “A, B, and / or C” or “at least one of A, B, or C” should be interpreted as including any single entity of the enumerated elements (e.g., A), any subset of the enumerated elements (e.g., A and B), or the entire list of elements A, B and C.

[0074] It should be noted that the figures provided herein may be illustrative rather than literally or precisely. The elements and aspects of the figures may not necessarily be to scale. Furthermore, while similar reference labels or numbers often indicate corresponding parts across different figures, the same reference numbers or labels are not necessarily given to the same parts in each figure. Furthermore, the same parts are not labeled in all figures or drawings. Numerical ranges described herein should be interpreted as including both endpoints of the range described. Certain axes, such as one or more rotational axes, transverse axes, and / or longitudinal axes, which may be omitted in some figures herein, should be interpreted as being present in all figures or situations in which they are referenced or reasonably corresponded.

Claims

1. A valve assembly, the valve assembly is A housing having an inner chamber, wherein an exhaust orifice is provided on the upper surface of the inner chamber that is in fluid communication with an exhaust port, the housing and A float assembly provided within the inner chamber, wherein the float assembly is movable along the longitudinal axis of the housing, The float assembly includes a hollow core section slidably coupled to the housing, and a platform positioned on the upper surface of the float assembly, the platform being angled with respect to a plane perpendicular to the longitudinal axis, A membrane comprising a first end formed elongated along the vertical axis and fixed to a first mounting portion of the float assembly, a second end provided on the opposite side of the first end and fixed to a second mounting portion of the float assembly, and a slack portion associated with the second end, Corresponding to the uppermost position of the float assembly along the longitudinal axis, the membrane is configured to cover and seal the exhaust orifice, and at least a portion of the membrane is supported by the platform. Based on the movement of the float assembly away from the uppermost position, the membrane is configured to reopen the exhaust orifice, and the reopening associated with the first end initiates the membrane detaching from the exhaust orifice. At least a portion of the sagging portion of the film includes curvature around an axis perpendicular to the longitudinal axis of the film. Valve assembly.

2. The valve assembly according to claim 1, wherein the exhaust orifice includes an elongated section aligned with the longitudinal axis of the membrane.

3. The slack portion of the membrane aligns and restrains the membrane with respect to the exhaust orifice. The valve assembly according to claim 1, which facilitates the sealing of the exhaust orifice by making the following easier.

4. The valve assembly according to claim 1, wherein the upper surface of the platform includes a cavity.

5. The valve assembly according to claim 4, wherein the cavity includes an elongated section aligned with the longitudinal axis of the platform.

6. The valve assembly according to claim 4, wherein the cavity includes projecting protrusions facing each other along the longitudinal axis of the platform.

7. The valve assembly according to claim 4, wherein the platform includes channels or grooves provided on the periphery of the cavity.

8. The valve assembly according to claim 1, wherein the first mounting portion is offset from the second mounting portion along the longitudinal axis, and the first mounting portion is offset relative to the second mounting portion toward the upper surface of the inner chamber.

9. The valve assembly according to claim 1, wherein the platform is angled at an angle between 5° and 30° with respect to a plane perpendicular to the longitudinal axis.

10. The valve assembly according to claim 1, wherein the membrane comprises a fluorine elastomer.

11. The valve assembly according to claim 10, wherein the fluorine elastomer is reinforced with one or more polymers.

12. The valve assembly according to claim 1, wherein at least a portion of the membrane is sandwiched between the platform and the exhaust orifice, corresponding to the uppermost position of the float assembly, to seal the exhaust orifice.

13. The valve assembly according to claim 1, further comprising a clip-type fastener for securing at least one of the first end or the second end of the membrane to the respective mounting portion of the float assembly.

14. The valve assembly according to claim 13, wherein the clip fastener includes a post configured to operatively connect to one or more of the membrane or the float assembly.

15. The valve assembly according to claim 14, wherein the membrane includes at least one through-hole configured to engage with the post.

16. The valve assembly according to claim 13, wherein the clip fastener includes one or more hooks or notches configured to operatively connect to the float assembly.

17. A valve assembly system, wherein the valve assembly system is The first valve assembly and A second valve assembly that is in fluid communication with the first valve assembly, The first valve assembly includes an exhaust port that is in fluid communication with it, The first valve assembly is A housing having an inner chamber, wherein an exhaust orifice is provided on the upper surface of the inner chamber that is in fluid communication with the exhaust port, the housing and A float assembly provided within the inner chamber, wherein the float assembly is movable along the longitudinal axis of the housing, The float assembly includes a hollow core section slidably coupled to the housing, and a platform positioned on the upper surface of the float assembly, the platform being angled with respect to a plane perpendicular to the longitudinal axis, A membrane comprising a first end formed elongated along the longitudinal axis and fixed to a first mounting portion of the float assembly, a second end provided on the opposite side of the first end and fixed to a second mounting portion of the float assembly, and a slack portion associated with the second end, Corresponding to the uppermost position of the float assembly along the longitudinal axis, the membrane is configured to cover and seal the exhaust orifice, and at least a portion of the membrane is supported by the platform. Based on the movement of the float assembly away from the uppermost position, the membrane is configured to reopen the exhaust orifice, and the reopening associated with the first end initiates the membrane detaching from the exhaust orifice. At least a portion of the sagging portion of the film includes curvature around an axis perpendicular to the longitudinal axis of the film. Valve assembly system.

18. A method for assembling a valve assembly, the method being The steps include providing the float assembly within the housing of the valve assembly, based on slidably coupling the hollow core section of the float assembly to one or more guide structures of the housing, A step of providing a platform on the upper surface of the float assembly, wherein the platform is angled with respect to a plane perpendicular to the longitudinal axis of the housing, A step of securing a first end of a membrane to a first mounting portion of the float assembly, wherein the membrane is formed to be elongated along a longitudinal axis, and is configured to cover and seal an exhaust orifice corresponding to the uppermost position of the float assembly along the longitudinal axis, and at least a portion of the membrane is supported by the platform, A step of securing the second end of the membrane to the second mounting portion of the float assembly, wherein the slack portion of the membrane is associated with the second end, and at least a portion of the slack portion of the membrane includes curvature about an axis perpendicular to the longitudinal axis of the membrane, method.

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