This application is a non-provisional of, and claims priority to, and the benefit of India Provisional Application No. 202041056067 with DAS code 33DE, entitled “INFLATABLE SYSTEMS WITH ELECTRO-PNEUMATIC VALVE MODULES,” filed on Dec. 23, 2020, which is hereby incorporated by reference in its entirety.
The present disclosure relates to inflatable systems and, in particular, to inflatable systems with electro-pneumatic systems and assemblies for use in aircraft evacuation systems.
An emergency evacuation assembly may be used to exit an aircraft absent a jet way or other suitable means of egress for passengers. The evacuation assembly may include an inflatable slide. Inflation valves may be used in conjunction with a high pressure stored gas that is controllably released to inflate an object, such as a raft, lifejacket, emergency slide, or the like. Inflation valves may be flow isolation valves actuated by electrical or mechanical arrangements but are typically single opening action valves meaning that they may only be used one time.
A valve assembly is disclosed herein. The valve assembly may comprise: a housing cap; a valve housing having an inlet port, an outlet port, and a pilot pressure inlet port, the inlet port disposed axially opposite the housing cap; a poppet defining an axial surface and a radially outer surface, the poppet including a first radial groove disposed in the radially outer surface; a first dynamic radial seal disposed in the first radial groove and in intimate contact with a radially inner surface of the valve housing, the first dynamic radial seal configured to maintain unobstructed contact with the radially inner surface of the valve housing in response to the poppet translating axially from an open position to a closed position.
In various embodiments, the valve assembly may further comprise a face seal, wherein: the poppet further comprises an annular face groove disposed in the axial surface, and the face seal is disposed in the annular face groove. The face seal may be configured to seal the inlet port in response to the valve assembly being in the closed position. In various embodiments, the valve assembly further comprise a second dynamic radial seal, wherein: the poppet further comprises a second radial groove disposed in the radially outer surface, the second radial groove being spaced apart axially from the first radial groove, and the second dynamic radial seal is disposed in the second radial groove. The valve assembly may further comprise a vent fitting coupled to the valve housing, the vent fitting disposed axially between the first dynamic radial seal and the second dynamic radial seal. The vent fitting may remain axially between the first dynamic radial seal and the second dynamic radial seal in response to the poppet translating axially to open the valve assembly. The housing cap and the poppet may at least partially define a command cavity. The command cavity may have fluid communication with the pilot pressure inlet port. The valve assembly may be configured to bias the poppet axially towards the inlet port in response to the command cavity and the inlet port being exposed to similar pressure from a pressurized fluid. The valve assembly may further comprise a biasing mechanism configured to bias the poppet axially towards the inlet port. The biasing mechanism may comprise a compression spring extending from the housing cap to the poppet. The valve housing may further comprise an internal pilot conduit and a command feed conduit. The internal pilot conduit may extend from the inlet port to a solenoid inlet port of a three-way normally open solenoid valve. The command feed conduit may extend from a solenoid outlet port of the three-way normally open solenoid valve to the pilot pressure inlet port of the inlet port. In various embodiments, the three-way normally open solenoid valve may further comprise: a plunger configured to seal a vent port in response to the three-way normally open solenoid valve being in a de-energized state; a poppet rod extending axially from the plunger to a second poppet, the poppet rod extending towards the solenoid inlet port; and an inlet port face seal coupled to the second poppet, the inlet port face seal configured to seal the solenoid inlet port in response to the three-way normally open solenoid valve being in an energized state.
An inflation system is disclosed herein. The inflation system may comprise: a compressed fluid source; an aspirator; a three-way normally open solenoid valve having a first inlet port, a first outlet port, and a first vent port, the compressed fluid source in fluid communication with the first inlet port; and a pneumatic valve, comprising: a housing cap disposed at a first axial end of the pneumatic valve; a valve housing defining a second inlet port, a second outlet port, and a pilot pressure inlet port, the first outlet port of the three-way normally open solenoid valve in fluid communication with the pilot pressure inlet port, the compressed fluid source in fluid communication with the second inlet port, and the second outlet port in fluid communication with the aspirator, the second inlet port disposed at a second axial end of the pneumatic valve, the second axial end being axially opposite the first axial end; and a poppet disposed axially between the housing cap and the second inlet port, the poppet configured to seal the second inlet port in response to the three-way normally open solenoid valve being in a de-energized sate, and the poppet configured to translate axially toward the housing cap and fluidly couple the second inlet port and the second outlet port in response to the three-way normally open solenoid valve being an energized state.
In various embodiments, the inflation system may further comprise an inflatable slide coupled to the aspirator. In various embodiments, the inflation system may further comprise a first dynamic radial seal coupled to the poppet, the first dynamic radial seal being in unobstructed contact with a radially inner surface of the valve housing, the first dynamic radial seal configured to maintain intimate contact with the radially inner surface in response to translating axially within the valve housing. The pneumatic valve may further comprise a face seal coupled to the poppet and configured to seal the second inlet port in response to the three-way normally open solenoid valve being in a de-energized state. In various embodiments, the pneumatic valve may further comprise a second dynamic radial seal and a vent fitting, the second dynamic radial seal being spaced apart axially from the first dynamic radial seal and coupled to the poppet , the vent fitting coupled to the valve housing and disposed axially between the first dynamic radial seal and the second dynamic radial seal.
A method for using a pneumatic valve is disclosed herein. The method may comprise:
receiving, from a pressurized fluid source and through a three-way normally open solenoid valve, a pressurized fluid in a command cavity of the pneumatic valve, the command cavity being defined by a housing cap, a valve housing, and poppet disposed in the valve housing; receiving, from the pressurized fluid source and through an inlet port defined by the valve housing, the pressurized fluid; sealing the inlet port via an annular face seal in response to a first pressure force in the command cavity being greater than a second pressure force in the inlet port; and translating the poppet axially within the valve housing to fluidly couple the inlet port to an outlet port defined by the valve housing in response to the three-way normally open solenoid valve being energized , the pneumatic valve comprising a first dynamic radial seal coupled to the poppet and in intimate contact with a radially inner surface of the valve housing, the first dynamic radial seal configured to maintain intimate contact with the radially inner surface in response to translating axially.
In various embodiments, the method may further comprise translating, via a biasing mechanism, the poppet axially towards the inlet port in response to the three-way normally open solenoid valve being de-energized. The biasing mechanism may comprise a compression spring disposed between the housing cap and the poppet. The method may further comprise venting, via a vent fitting coupled to the valve housing, leaked fluid in response to the pressurized fluid leaking past the first dynamic radial seal, the vent fitting being disposed axially between the first dynamic radial seal and a second dynamic radial seal.
The foregoing features and elements may be combined in various combinations without exclusivity, unless expressly indicated otherwise. These features and elements as well as the operation thereof will become more apparent in light of the following description and the accompanying drawings. It should be understood, however, the following description and drawings are intended to be exemplary in nature and non-limiting.
The subject matter of the present disclosure is particularly pointed out and distinctly claimed in the concluding portion of the specification. A more complete understanding of the present disclosure, however, may best be obtained by referring to the detailed description and claims when considered in connection with the figures, wherein like numerals denote like elements.
The detailed description of exemplary embodiments herein makes reference to the accompanying drawings, which show exemplary embodiments by way of illustration. While these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the exemplary embodiments of the disclosure, it should be understood that other embodiments may be realized and that logical changes and adaptations in design and construction may be made in accordance with this disclosure and the teachings herein. Thus, the detailed description herein is presented for purposes of illustration only and not limitation. The steps recited in any of the method or process descriptions may be executed in any order and are not necessarily limited to the order presented.
Furthermore, any reference to singular includes plural embodiments, and any reference to more than one component or step may include a singular embodiment or step. Also, any reference to attached, fixed, connected or the like may include permanent, removable, temporary, partial, full and/or any other possible attachment option.
Surface cross hatching lines may be used throughout the figures to denote different parts but not necessarily to denote the same or different materials. Throughout the present disclosure, like reference numbers denote like elements. Accordingly, elements with like element numbering may be shown in the figures but may not necessarily be repeated herein for the sake of clarity.
Referring now to
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In accordance with various embodiments, evacuation slide 16 includes a toe end 18 and a head end 20 opposite toe end 18. Head end 20 may be coupled to an aircraft structure (e.g., fuselage 11 in
Evacuation slide 16 may comprise an inflatable rail structure 26. Inflatable rail structure 26 includes a first (or upper) inflatable tube 28. In various embodiments, inflatable rail structure 26 may include a second (or lower) inflatable tube 30. First inflatable tube 28 and second inflatable tube 30 may extend between head end 20 and toe end 18. Upon deployment of evacuation slide 16, first inflatable tube 28 may be located generally over or above second inflatable tube 30, such that second inflatable tube 30 is located generally between first inflatable tube 28 and the exit surface.
Evacuation assembly 14 may include a compressed fluid source, or charge cylinder, 32. Compressed fluid source 32 is configured to deliver a pressurized gas to inflate evacuation slide 16. Compressed fluid source 32 may be fluidly coupled to evacuation slide 16. For example, compressed fluid source 32 may be fluidly coupled to inflatable rail structure 26. In various embodiments, compressed fluid source 32 may be fluidly coupled to evacuation slide 16 via a hose, or conduit, 34. In response to receiving the gas from compressed fluid source 32, evacuation slide 16 begins to inflate.
In various embodiments, evacuation assembly 14 may include one or more aspirator(s) 40 fluidly coupled between compressed fluid source 32 and evacuation slide 16. In various embodiments, first inflatable tube 28 and second inflatable tube 30 may each have a dedicated aspirator 40, such that a first aspirator is attached, or coupled, to first inflatable tube 28 and a second aspirator is attached, or coupled, to second inflatable tube 30. Aspirator 40 may be configured to entrain ambient air with gas output from compressed fluid source 32 (referred to herein as primary gas). For example, in response to deployment of evacuation slide 16, primary gas from compressed fluid source 32 may flow into aspirator 40. This primary gas flow may cause aspirator 40 to draw in a secondary gas (i.e., ambient air) from the environment. The primary gas flow and the secondary gas may be directed into inflatable rail structure 26. In response to receiving the primary gas and the environmental gas, evacuation slide 16 begins to inflate.
In various embodiments, evacuation assembly 14 further comprises an inflation system 100. The inflation system 100 comprises the compressed fluid source 32, the aspirator 40, and a valve module 200. In various embodiments, the inflation system 100 may be self-monitoring and self-sustained as described further herein. In various embodiments, the inflation system 100 may utilize inflatable stretch feedback and inflation flow shut off control with the aspirator 40 to achieve a pre-set inflatable stretch for the evacuation slide 16. In various embodiments, typical valve modules 200 for inflation systems involve sliding O-ring seals which may pass a valve outlet aperture upon each cycle between valve opening and valve closing. In this regard, the sliding O-ring seal may wear and/or limit an operating cycle life for a typical inflation system. In various embodiments, an inflation system 100, as described further herein, includes a valve module with improved leakage control. Thus, the inflation system 100 may result in greater operating cycle life for the valve module 200 relative to typical inflation systems, in accordance with various embodiments.
Referring now to
The controller 110 of the inflation system 100 may include one or more logic devices such as one or more of a central processing unit (CPU), an accelerated processing unit (APU), a digital signal processor (DSP), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or the like. In various embodiments, the controller 110 may further include any non-transitory memory known in the art. The memory may store instructions usable by the logic device to perform operations.
The inflation system 100 may further include a database or remote memory 112. The database 112 may be located on a same aircraft as the inflation system 100 or may be located remote from the inflation system 100. The controller 110 may communicate with the database 112 via any wired or wireless protocol. In that regard, the controller 110 may access data stored in the database 112. The database 112 may store pre-determined stretch thresholds of the inflation system 100 and may store instructions for the valve module 200 of the inflation system 100 that are associated with predetermined stretch threshold. For example, the valve module 200 may be actuated in response to the predetermined stretch threshold being exceeded, in accordance with various embodiments.
The inflation system 100 may further include two or more sensors 140. For example, the sensor may include at least one stretch sensor and at least one temperature sensor in operable communication with the controller 110. Each of the sensors in the two or more sensors 140 may communicate with the controller 110. In various embodiments, the controller 110 may compare the stretch value from the stretch sensor and the temperature sensor (i.e., to accommodate for any thermal drift in the stretch sensor output with varying ambient temperatures) and compare the stretch value to the predetermined stretch threshold, in accordance with various embodiments.
In various embodiments, the valve module 200 comprises a solenoid valve 210 and a pneumatic valve 220. In various embodiments, the solenoid valve 210 is in communication with the controller 110. In this regard, the controller 110 is configured to energize the solenoid valve 210, in accordance with various embodiments. The solenoid valve 210 may be open in an unenergized state and closed in an energized state, as described further herein.
In various embodiments, the compressed fluid source 32 is fluidly coupled to the solenoid valve 210 and the pneumatic valve 220. In various embodiments, the pneumatic valve 220 may be in a closed position in response to the solenoid valve being open (i.e., when the solenoid valve is not energized), and the pneumatic valve 220 may be in an open position in response to the solenoid valve being closed (i.e., when the solenoid valve is energized). In various embodiments, in response to the pneumatic valve 220 being in an open position, the compressed fluid source 32 may be fluidly coupled to the evacuation slide 16 through the pressure regulator 130 and the aspirator 40.
Referring now to
In various embodiments, the pneumatic valve 220 further comprises a biasing mechanism 340 configured to supply a biasing force in response to the poppet 320 travelling axially away from the inlet port 312 and toward the housing cap 330. For example, the biasing mechanism 340 may be a compression spring, an extension spring, a torsion spring, or the like. In various embodiments, the biasing mechanism 340 comprises a compression spring 342 disposed between the housing cap 330 and the inlet port 312. In various embodiments, if a tension spring were used, the tension spring would be disposed on an opposite side of the poppet 320 and configured to provide a pulling force on the poppet 320 axially towards the inlet cavity 360 in response to the poppet 320 travelling axially towards the housing cap 330.
In various embodiments, the pilot pressure inlet port 316 is in fluid communication with a command cavity 350. The command cavity 350 may be defined by the poppet 320, the valve housing 310, and the housing cap 330, in accordance with various embodiments. In various embodiments, in response to the solenoid valve 210 being open, a first fluid pressure force in the command cavity 350 may be greater than a second fluid pressure force at the inlet port 312, which will cause the poppet 320 to close the outlet port 314. In this regard, in response to the poppet 320 being in a closed position, the outlet port 314 is sealed from the command cavity 350 and the inlet port 312, in accordance with various embodiments.
For example, the pneumatic valve 220 may further comprise a first seal 322 and a second seal 324. In various embodiments, the first seal 322 is configured to seal the command cavity 350 from the outlet port 314 independent of whether the pneumatic valve 220 is in an open position or a closed position. In various embodiments, the second seal 324 is configured to seal the inlet port 312 from the outlet port 314 in response to the pneumatic valve 220 is in a closed position. In various embodiments, the poppet 320 may include an annular face groove at an axial end of the poppet 320 proximate the inlet port 312, the annular face groove configured to house the second seal 324. Similarly, the poppet 320 may include a radial groove disposed in a circumferential face of the poppet 320 and configured to house the first seal 322.
In various embodiments, the first seal 322 and the second seal 324 may be any seal known in the art. In various embodiments, the first seal 322 comprises a dynamic radial seal, such as an O-ring (e.g., an annular elastomeric gasket). In various embodiments, the second seal 324 may comprise a face seal (e.g., a seal having sealing surfaces that are normal to the axis of the seal). In various embodiments, the valve housing 310 further comprises a seal land 318 disposed proximate the inlet port 312. The seal land 318 is configured to interface with the second seal 324 in response to the poppet 320 being pressurized into a closed position. In various embodiments, the first seal 322 has a greater diameter than the second seal 324. In this regard in response to the solenoid valve 210 being in energized, a losing force may act on the poppet 320 axially towards the inlet port 312 and ensure a leak tight seal. In various embodiments, the first seal 322 maintains unobstructed contact with a radially inner surface of the valve housing 310 during translation of the poppet 320 from open to closed and vice versa.
Referring now to
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In various embodiments, the valve body 710 further comprises an inlet port 722, an outlet port 724, and a vent port 726. The inlet port 722 is disposed at a first axial end of the valve body 710 and disposed axially through the first axial portion 712 of the valve body 710, in accordance with various embodiments. The outlet port 724 is disposed at a second axial end of the valve body 710 and disposed axially through the second axial portion 716 of the valve body 710, in accordance with various embodiments. The outlet port 724 is disposed radially through the first axial portion 712 of the valve body 710 in accordance with various embodiments.
In various embodiments, the solenoid valve 210 further comprises an actuator 730 having a plunger 732 and a poppet rod 734. The plunger 732 may be coupled to the poppet rod 734 by any method known in the art, such as a threaded coupling, a press fit, or the like. The plunger 732 is disposed proximate the vent port 726. The poppet rod 734 includes a shaft 735 coupled to the plunger 732 and a poppet 736 disposed proximate the inlet port 722. In various embodiments, the actuator 730 further comprises a vent port seal 733 coupled to the plunger 732 and disposed at a first axial end of the actuator 730, and the actuator 730 further comprises an inlet port seal 737 coupled to the poppet 736 and disposed at a second axial end of the actuator 730, the second axial end being disposed axially opposite the first axial end.
In various embodiments, the plunger 732 is biased in a closed position. For example, a spring 760 may be disposed between the plunger 732 and the solenoid core 714. In various embodiments, the spring 760 is a compression spring and configured to compress the plunger 732 against the vent port 726 to seal the vent port 726 in a de-energized position. Additionally, the poppet 736 is configured to be spaced apart from the inlet port 722 in the de-energized position. In this regard, the solenoid valve 210 is configured as a normally open three-way solenoid valve, in accordance with various embodiments.
In various embodiments, the solenoid valve 210 further comprises a solenoid coil 750.
The solenoid coil 750 comprises a conductive metallic wire wound into a cylindrical shape and is disposed radially outward of the actuator 730. A max air gap for the solenoid valve 210 is disposed between the plunger 732 and the solenoid core 714. In various embodiments, the solenoid coil 750 is in electrical communication with controller of an inflation system (e.g., the controller 110 from
In various embodiments, as the inlet port 722 receives a pressurized fluid (e.g., from compressed fluid source 32 from
Referring now to
In various embodiments, in the energized state, the outlet port 724 is in fluid communication with the vent port 726 and configured to vent the pressurized fluid from the command cavity of pneumatic valve 220 from
In various embodiments, in response to the solenoid valve 210 being energized, a solenoid force is developed across the air gap between the plunger 732 and the stator pole face 713 of the solenoid core 714. In response to the solenoid force, the inlet port 722 is sealed by the inlet port seal 737. From the energized (e.g., actuated) state illustrated in
Referring now to
In various embodiments, the valve assembly 800 further comprises a valve housing 830. The valve housing 830 may define a main valve inlet port 831, a pneumatic valve inlet port 832, an internal pilot conduit 833, an internal command feed conduit 834, and an outlet port 835. In various embodiments, the main valve inlet port 831 is in fluid communication with the pneumatic inlet port 832 and the internal pilot conduit 833. In various embodiments, the internal pilot conduit 833 is configured to act as an inlet port for the solenoid valve 810 (e.g., inlet port 722 from
In various embodiments, the valve assembly 800 may be configured to be mechanically and fluidly coupled the to a compressed fluid source 32, such as a pressurized gas bottle, or the like. For example, the valve housing 830 may comprise a coupling end 842 disposed proximate the inlet port. The coupling end 842 may be any coupling end known in the art, such as a mail threaded end, a female threaded, end, a press fit end, or the like. Similarly, the outlet port 835 of the valve assembly 800 may be configured to be mechanically and fluidly coupled to a pipe assembly, or directly to a pressure regulator, via a threaded connection, a press fit, or the like.
In various embodiments, the solenoid valve 810 includes a first axial end 811 defining a recess 812. In various embodiments, the recess 812 and a recess 836 of the valve housing 830 may define a main cavity (e.g., main cavity 770 from
In various embodiments, the pneumatic valves 220, 500, 820 benefit from having only a single moving part (e.g., the poppet 320). In various embodiments, the various seals (e.g., the seals 322, 324, 520) may comprise polymer materials, such as polychlorotrifluoroethylene (PCTFE), polyether ether ketone (PEEK), or the like. In various embodiments, the seals configured for flat sealing (e.g., seal 324) may be custom designed to achieve optimal leak tightness for the pneumatic valves 220, 500, 820. In various embodiments, the seals configured for dynamic sliding (e.g., seals 322, 520) may not pass through any open cutouts of the valve housing, which may prevent degradation of the seals, resulting in longer seal life relative to typical pneumatic valves. In various embodiment, redundant dynamic radial sealing (e.g., seals 322, 520 from
In various embodiments, the solenoid valves 210, 810 disclosed herein may be manufactured in a smaller design space relative to typical solenoid valves by using two flat seals (e.g., seals 733, 737) disposed axially opposite each other. In various embodiments, the two flat seals (e.g., seals 733, 737) may be designed to achieve optimal leak tightness using polymer material, such as PCTFE, PEEK, or the like. In various embodiments, the solenoid valves 210, 810 may be manufactured via an all welded construction, namely welding between the first axial portion 712 and the solenoid core 714, welding between the solenoid core 714 and the solenoid coil 750, and welding between the solenoid core 714 and the second axial portion 716. In various embodiments, by manufacturing the solenoid valves 210, 810 via all welded constructions, static seals from typical solenoid valves may be eliminated.
A method for using a pneumatic valve is disclosed herein. The method may comprise:
receiving, from a pressurized fluid source and through a three-way normally open solenoid valve, a pressurized fluid in a command cavity of the pneumatic valve, the command cavity being defined by a housing cap, a valve housing, and poppet disposed in the valve housing; receiving, from the pressurized fluid source and through an inlet port defined by the valve housing, the pressurized fluid; sealing the inlet port via an annular face seal in response to a first pressure in the command cavity being greater than a second pressure in the inlet port; and translating the poppet axially within the valve housing to fluidly couple the inlet port to an outlet port defined by the valve housing in response to the three-way normally open solenoid valve being energized , the pneumatic valve comprising a first dynamic radial seal coupled to the poppet and in intimate contact with a radially inner surface of the valve housing, the first dynamic radial seal configured to maintain intimate contact with the radially inner surface in response to translating axially.
In various embodiments, the method may further comprise translating, via a biasing mechanism, the poppet axially towards the inlet port in response to the three-way normally open solenoid valve being de-energized. The biasing mechanism may comprise a compression spring disposed between the housing cap and the poppet. The method may further comprise venting, via a vent fitting coupled to the valve housing, leaked fluid in response to the pressurized fluid leaking past the first dynamic radial seal, the vent fitting being disposed axially between the first dynamic radial seal and a second dynamic radial seal.
A valve assembly is disclosed herein. The valve assembly may comprise: a valve main body defining a first inlet port, a first outlet port, and a vent port, the first inlet port disposed at a first axial end of the valve main body, the vent port disposed at a second axial end of the valve main body; a solenoid core; a solenoid coil disposed radially outward of the solenoid core; a plunger disposed axially between the solenoid core and the vent port, the plunger separated axially from the solenoid core by an air gap, the plunger configured to seal the vent port in response to the solenoid coil being in a de-energized state; a poppet rod extending from the plunger through the solenoid core into a main cavity; a first poppet coupled to the poppet rod and disposed proximate the first inlet port, the first poppet configured to seal the first inlet port in response to the solenoid coil being in an energized state.
In various embodiments, the plunger includes a first fluid conduit and the solenoid core includes a second fluid conduit. The first outlet port may be fluidly coupled to the vent port through the first fluid conduit and the second fluid conduit in response to the solenoid coil being energized. The valve assembly may further comprise a compression spring disposed between the solenoid core and the plunger, the compression spring configured to bias the plunger toward the vent port. The valve assembly may further comprise a first face seal proximal the first inlet port and a second face seal proximal the vent port, wherein the first face seal is configured to seal the vent port in response to the solenoid coil being de-energized, and wherein the second face seal is configured to seal the first inlet port in response to the solenoid coil being energized. The first face seal may be coupled to the first poppet, and the second face seal may be coupled to the plunger. The valve main body may further comprise a first axial portion and a second axial portion. The first axial portion may include the first inlet port and the first outlet port. The second axial portion may include the vent port. The first axial portion may be coupled to the solenoid core. The second axial portion may be coupled to the solenoid core. The first axial portion may be welded to the solenoid core, and the second axial portion may be welded to the solenoid core. The plunger, the first poppet, and the poppet rod may be configured to translate axially towards the first inlet port in response to the solenoid coil being energized. A compression spring may be configured to bias the plunger, the first poppet, and the poppet rod back axially towards the vent port in response to the solenoid coil being de-energized. The valve assembly may further comprise a valve housing. The valve housing may further comprise an internal pilot conduit and a command feed conduit. The internal pilot conduit may extend from a main inlet port of the valve housing to the first inlet port. The command feed conduit may extend from the first outlet port to a pilot pressure inlet port of a pneumatic valve. The valve housing may further comprise a second inlet port and a second outlet port. The pneumatic valve may further comprise: a second poppet defining an axial surface and a radially outer surface, the second poppet including a first radial groove disposed in the radially outer surface; a first dynamic radial seal disposed in the first radial groove and in intimate contact with a radially inner surface of the valve housing, the first dynamic radial seal configured to maintain intimate contact with the radially inner surface of the valve housing in response to the second poppet translating axially from an open position to a closed position.
An inflation system is disclosed herein. The inflation system may comprise: a compressed fluid source; an aspirator; a pneumatic valve having a first inlet port, a first outlet port, and a pilot pressure inlet port, the first inlet port in fluid communication with the compressed fluid source, the first outlet port in fluid communication with the aspirator; and a solenoid valve, comprising: a second inlet port, the compressed fluid source in fluid communication with the second inlet port; a second outlet port, the second outlet port in fluid communication with the pilot pressure inlet port; and a vent port, the second inlet port disposed axially opposite the vent port; a solenoid coil; a solenoid core disposed radially inward from the solenoid coil; a plunger disposed axially between the solenoid core and the vent port, the plunger being biased toward the vent port in response to the solenoid coil being de-energized, the plunger configured to create a vent seal with the vent port in response to the solenoid coil being de-energized, a poppet rod extending from the plunger through the solenoid core proximal the second inlet port, and a poppet coupled to the poppet rod proximal the second inlet port, the poppet configured to translate axially towards the second inlet port in response to the solenoid coil being energized and create an inlet seal with the second inlet port.
The inflation system may further comprise an inflatable slide coupled to the aspirator.
The plunger may include a first fluid conduit and the solenoid core includes a second fluid conduit. The second outlet port may be fluidly coupled to the vent port through the first fluid conduit and the second fluid conduit in response to the solenoid coil being energized. The inflation system may further comprise a valve housing including a recess, wherein: the solenoid valve is coupled to the recess; the valve housing further comprises an internal pilot conduit and a command feed conduit, the internal pilot conduit extends from a main inlet port of the valve housing to the first inlet port, the first inlet port being disposed in the recess, and the command feed conduit extends from the first outlet port to the pilot pressure inlet port of the pneumatic valve, the first outlet port being disposed in the recess.
A method for using a solenoid valve is disclosed herein. The method may comprise:
receiving, from a controller and through an electrical connection, a current to energize the solenoid valve; generating, via a solenoid coil and a solenoid core, an electric field within the solenoid valve; translating a plunger, a poppet rod, and a poppet axially away from a vent port of the solenoid valve and towards an inlet port of the solenoid valve in response to the electric field being generated; sealing the inlet port with the poppet in response to a first face seal being compressed at the inlet port; and venting a pressurized fluid from a command cavity of a pneumatic valve from an outlet port through a first fluid conduit in the solenoid core through a second fluid conduit in the plunger, and out the vent port.
The method may further comprise translating, via a biasing mechanism, the plunger, the poppet rod, and the poppet axially towards the vent port in response to the solenoid coil being de-energized. The biasing mechanism may comprise a compression spring disposed between the solenoid core and the plunger. The method may further comprise sealing, via a second face seal coupled to the plunger, the vent port in response to the solenoid coil being de-energized.
Benefits and other advantages have been described herein with regard to specific embodiments. Furthermore, the connecting lines shown in the various figures contained herein are intended to represent exemplary functional relationships and/or physical couplings between the various elements. It should be noted that many alternative or additional functional relationships or physical connections may be present in a practical system. However, the benefits, advantages, and any elements that may cause any benefit or advantage to occur or become more pronounced are not to be construed as critical, required, or essential features or elements of the disclosure. The scope of the disclosure is accordingly to be limited by nothing other than the appended claims, in which reference to an element in the singular is not intended to mean “one and only one” unless explicitly so stated, but rather “one or more.” Moreover, where a phrase similar to “at least one of A, B, or C” is used in the claims, it is intended that the phrase be interpreted to mean that A alone may be present in an embodiment, B alone may be present in an embodiment, C alone may be present in an embodiment, or that any combination of the elements A, B and C may be present in a single embodiment; for example, A and B, A and C, B and C, or A and B and C.
Systems, methods and apparatus are provided herein. In the detailed description herein, references to “various embodiments”, “one embodiment”, “an embodiment”, “an example embodiment”, etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described. After reading the description, it will be apparent to one skilled in the relevant art(s) how to implement the disclosure in alternative embodiments.
Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. No claim element herein is intended to invoke 35 U.S.C. 112(f), unless the element is expressly recited using the phrase “means for.” As used herein, the terms “comprises”, “comprising”, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Number | Date | Country | Kind |
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202041056067 | Dec 2020 | IN | national |