Adjustable pressure relief assembly

Abstract

A pressure relief assembly (100) has a housing (140) having a coupling structure (142) configured to couple to an enclosure (10), an airflow pathway (144), a vent opening (146) along the airflow pathway, a valve opening (145) functionally parallel with the vent opening along the airflow pathway, and circumferential threading (149) around the airflow pathway. The pressure relief assembly has a breathable membrane (152). The breathable membrane is coupled to the housing across the vent opening. The pressure relief assembly has a valve body (130). The valve body is coupled to the housing across the valve opening. The pressure relief assembly has a spring mount (110). The spring mount is coupled to the housing, wherein the spring mount has mating threading (112) in threaded engagement with the circumferential threading. The pressure relief assembly has a spring (120) compressibly disposed between the valve body and the spring mount.

Description

ADJUSTABLE PRESSURE RELIEF ASSEMBLY

[0001] This application claims the benefit of U.S. Provisional Application No. 63 / 675,362 filed on 25 July 2024, which is incorporated by reference herein in its entirety.Technological Field

[0002] The present disclosure is generally related to a pressure relief assembly and a method of manufacturing a pressure relief assembly. More particularly, the present disclosure is related to an adjustable two stage spring valve.Summary

[0003] Some embodiments of the technology disclosed herein relate to a pressure relief assembly. The pressure relief assembly has a housing having a coupling structure configured to couple to an enclosure, an airflow pathway, a vent opening along the airflow pathway, a valve opening functionally parallel with the vent opening along the airflow pathway, and circumferential threading around the airflow pathway. The pressure relief assembly has a breathable membrane. The breathable membrane is coupled to the housing across the vent opening. The pressure relief assembly has a valve body. The valve body is coupled to the housing across the valve opening. The pressure relief assembly has a spring mount. The spring mount is coupled to the housing, wherein the spring mount has mating threading in threaded engagement with the circumferential threading. The pressure relief assembly has a spring compressibly disposed between the valve body and the spring mount.

[0004] In some such embodiments, the spring mount is fixed to the housing. Additionally or alternatively, the circumferential threading has an axial length that is greater than an axial length of the mating threading. Additionally or alternatively, the coupling structure surrounds the airflow pathway. Additionally or alternatively, the housing and the spring mount are directly bonded through a weld. Additionally or alternatively, the housing and the spring mount are fixed via adhesive. Additionally or alternatively, the spring is a compression spring. Additionally or alternatively, thepressure relief assembly further includes a membrane cover disposed across the breathable membrane. Additionally or alternatively, the pressure relief assembly further includes a cap coupled to the housing. Additionally or alternatively, the valve body includes a first end and a second end, and the valve body further includes a spring adapter disposed towards the second end of the valve body and a valve obstruction disposed towards the first end of the valve body. Additionally or alternatively, the pressure relief assembly further includes a first seal disposed between the valve body and the housing. Additionally or alternatively, the coupling structure includes a second seal configured to be disposed between the housing and the enclosure. Additionally or alternatively, the spring mount is spaced in an axial direction from the valve body.

[0005] Some embodiments of the technology disclosed herein relate to a method of manufacturing a vent assembly. A valve body is disposed across a valve opening. A housing defines the valve opening. The circumferential threading of housing is threadably engaged with the mating threading of a spring mount. A breathable membrane is disposed across a vent opening. A spring is compressibly disposed between the valve body and the spring mount. The spring mount is rotated relative to the housing resulting in axial translation of the spring mount and a change in the compression force of the spring.

[0006] In some such embodiments, the spring mount is fixed to the valve body. Additionally or alternatively, the breathable membrane is coupled to the housing. Additionally or alternatively, a membrane cover is disposed across the breathable membrane. Additionally or alternatively, a cap is coupled to the housing. Additionally or alternatively, disposing the spring include positioning the spring between a spring adapter of the valve body and a valve obstruction of the valve body. Additionally or alternatively, a first seal is disposed between the valve body and the housing. Additionally or alternatively, a second seal is disposed around a coupling structure defined by the housing. Additionally or alternatively, the spring mount is secured to the housing.Brief Description of the Drawings

[0007] The present technology may be more completely understood and appreciated in consideration of the following detailed description of various embodiments in connection with the accompanying drawings.

[0008] FIG. 1 is a cross-sectional view of an example pressure relief assembly consistent with the technology disclosed herein.

[0009] FIG. 2 is an exploded perspective view of the example pressure relief assembly of FIG.1.

[0010] FIG. 3 is a cross-sectional view from another example pressure relief assembly consistent with the technology disclosed herein.

[0011] FIG. 4 is a cross-sectional perspective view of the example pressure relief assembly of FIG. 3.

[0012] FIG. 5 is a cross-sectional perspective view of yet another example pressure relief assembly consistent with the technology disclosed herein.

[0013] FIG. 6 is an example method consistent with the technology disclosed herein.

[0014] The figures are rendered primarily for clarity and, as a result, are not necessarily drawn to scale. Moreover, various structure / components, including but not limited to fasteners, electrical components (wiring, cables, etc.), and the like, may be shown diagrammatically or removed from some or all of the views to better illustrate aspects of the depicted embodiments, or where inclusion of such structure / components is not necessary to an understanding of the various exemplary embodiments described herein. The lack of illustration / description of such structure / components in a particular figure is, however, not to be interpreted as limiting the scope of the various embodiments in any way.Detailed Description

[0015] Pressure relief assemblies consistent with the technology disclosed herein are generally configured to provide pressure relief to an enclosure when the pressure within the enclosure exceeds a minimum pressure differential relative to an environment outside of the enclosure. The pressure relief assembly is generally configured to be coupled to the enclosure, where the enclosure is generally not a component of the pressure relief assembly. The pressure relief assembly can be configured for selective pressure equalization of the enclosure while preventing the entry of contaminants, such as particles and liquids (such as water), into the enclosure. The enclosure is generally configured to house system components such as electroniccomponents and battery cells, as examples. In some examples, the enclosure is a battery housing.

[0016] The pressure relief assembly generally includes a housing, a breathable membrane, a valve body, a spring mount, and a spring. The housing generally includes a coupling structure, an airflow pathway, a vent opening along the airflow pathway, a valve opening, and circumferential threading around the airflow pathway. The coupling structure is generally configured to be coupled to an enclosure. The valve opening is functionally parallel with the vent opening along the airflow pathway. The breathable membrane is generally configured to be coupled to the housing across the vent opening. The valve body is generally configured to be coupled to the housing across the valve opening. The spring mount is generally configured to be coupled to the housing. The spring mount has mating threading in threaded engagement with the circumferential threading. The spring is compressibly disposed between the valve body and the spring mount.

[0017] The present disclosure describes pressure relief assemblies and methods of manufacturing pressure relief assemblies.

[0018] FIG. 1 is a cross-sectional view of an example pressure relief assembly consistent with the technology disclosed herein. FIG. 2 is an exploded perspective view of the example pressure relief assembly of FIG.1. The pressure relief assembly 100 is generally configured to be coupled to an enclosure 10 (shown in FIG. 1) and provide pressure equalization between the enclosure and the outside environment. The pressure relief assembly 100 generally includes a housing 140, a breathable membrane 152, a valve body 130, a spring mount 110, and a spring 120.

[0019] The housing 140 is generally configured to sealably coupled to an enclosure 10. The housing 140 is additionally configured to sealably couple to the valve body 130. The housing 140 can be constructed of a variety of materials and combinations of materials including plastic, metal, wood, and the like. In some embodiments, the housing 140 is constructed with an injection-molded plastic such as polycarbonate or others. The housing 140 generally has a first end 180 and a second end 182. The housing 140 generally includes a coupling structure 142, an airflow pathway 144, a vent opening 146 along the airflow pathway 144, a valve opening 145, and circumferential threading 149 around a portion of the airflow pathway 144.

[0020] In the current example, the housing 140 has an axial sidewall 141 that extends in the axial direction from the coupling structure 142 to the first end 180 of the housing. In some embodiments, the axial sidewall 141 extends in the axial direction from the second end 182 to the first end 180 of the housing 140. The axial sidewall 141 surrounds the valve body 130, the spring 120, and the spring mount 110.

[0021] The coupling structure 142 is generally configured to be coupled to the enclosure 10 (shown in FIG. 1) about an enclosure opening 20. The coupling structure 142 can be any suitable configuration to engage the enclosure 10. In the current example, the coupling structure 142 defines screw threading that is configured to engage the enclosure 10. In some embodiments the enclosure 10 defines mating threading. In some other embodiments, the coupling structure 142 can form a snap-fit connection with the enclosure 10. In various embodiments, the coupling structure 142 is configured to mate with a corresponding structure defined by the casing. As another example, the coupling structure interlocks with the enclosure about the enclosure opening, such as where the coupling structure defines a bayonet connector, and the enclosure defines a mating bayonet connector. In some embodiments, the coupling structure can be coupled to the enclosure around the enclosure opening with an adhesive, weld (such as a heat weld or ultrasonic weld), or the like.

[0022] In some embodiments, the coupling structure 142 includes a housing seal 194. The housing seal 194 is configured to be disposed between the housing 140 and the enclosure 10. The housing seal 194 is configured to be disposed between the housing 140 and the enclosure 10 (shown in FIG. 1). The housing seal 194 is configured to create a seal region between the housing 140 and the enclosure when the pressure relief assembly 100 is coupled to the enclosure. The housing seal 194 generally surrounds a portion of the airflow pathway 144. The housing seal 194 surrounds the second end 182 in the example currently depicted.

[0023] In the current example, the coupling structure 142 surrounds the airflow pathway 144. A portion of the airflow pathway 144, which can be considered a valve airflow pathway 144a, is selectively obstructed by the valve body 130. The valve body 130 is configured to relieve pressure when the pressure within the enclosure 10 exceeds a minimum pressure differential relative to the environment outside of the enclosure 10. When the enclosure 10 exceeds a minimum pressure differential relative to the environment outside of the enclosure 10, the valve body 130 relieves thepressure through the valve opening 145 via the valve airflow pathway 144a. When the enclosure 10 does not exceed a minimum pressure differential relative to the environment outside of the enclosure 10, the valve body 130 obstructs the valve airflow pathway 144a, and fluid communication between the interior of the housing 140 and the external environment is through the vent opening 146 via a vent airflow pathway 144b.

[0024] The axial sidewall 141 defines one or more environmental openings 148. The environmental opening 148 defines a portion of the airflow pathway 144, for example, the valve airflow pathway 144a between the housing 140 and the external environment. In the current example, the axial sidewall 141 defines a plurality of environmental openings 148, but in some embodiments, the axial sidewall 141 defines a single environmental opening 148. In some embodiments, the environmental openings 148 are spaced around the axis x.

[0025] The vent opening 146 is positioned along the airflow pathway 144. The vent opening 146 is generally configured to define a fluid communication pathway between the enclosure 10 and the external environment. The vent opening 146 is also generally configured to define a fluid communication pathway between the interior of the housing 140 and the external environment. The vent opening 146 defines a portion of the airflow pathway 144, for example the vent airflow pathway 144b, between the interior of the housing 140 and the external environment. In some embodiments, the pressure relief assembly 100 has only one vent opening. In some other embodiments, the pressure relief assembly 100 has a plurality of vent openings. In the current example, the vent openings 146 are spaced around an axis x extending in the axial direction. The axis x can be a central axis of the housing 140. Also in the current example, the vent openings 146 are disposed between the valve opening 145 and the coupling structure 142 in the axial direction.

[0026] In the current example, the vent opening 146 is generally the vent airflow pathway 144b defined by a sidewall of the housing 140 that extends from the interior of the housing 140 to the external environment. The vent opening generally allows fluid communication between the interior of the housing 140 and the external environment when the airflow pathway 144 is obstructed by the valve body 130. The vent opening 146 generally defines a channel 143. The channel 143 has a first vent opening end 143a and a second vent opening end 143b. The first vent opening end143a is in direct fluid communication with the external environment and the second vent opening end 143b is in direct fluid communication with the interior of the housing 140. In some embodiments, the vent opening 146 is generally positioned upstream of the valve opening 145 with respect to airflow from the second end 182 to the first end 180 of the housing 140. Other configurations are also contemplated, which will be discussed in more detail below.

[0027] The breathable membrane 152 is generally configured to be coupled to the housing 140 across the vent opening 146. The breathable membrane 152 is generally configured to prevent the ingress of outside contaminants, such as water spray and debris, into the enclosure 10 from the external environment. The breathable membrane 152 may be coupled to the housing 140 via any suitable method. In some embodiments, the breathable membrane 152 is coupled to the housing 140 by adhesive or a weld area around the vent opening 146. The weld can be a heat weld or an ultrasonic weld, as examples. In various embodiments, the breathable membrane has a perimeter region coupled to the housing 140 and a central region defining the vent airflow pathway 144b. In some embodiments, the breathable membrane 152 is sealably disposed on a frame that is sealably coupled to the housing 140 around the vent opening 146.

[0028] The breathable membrane 152 can be made of any suitable materials and combinations of materials, for example, polyethersulfone (PES), nylon, cellulose acetate, polyvinylidene difluoride (PVDF), polyamide, polycarbonate, and acrylic. In various embodiments, the breathable membrane is constructed of porous polytetrafluoroethylene (PTFE). Porous PTFE can be produced through a variety of approaches and combinations of approaches. In some embodiments, there is no breathable membrane in the pressure relief assembly 100.

[0029] The valve opening 145 is functionally parallel with the vent opening 146 along the airflow pathway 144, meaning that the valve opening 145 and the vent opening 146 are arranged functionally in parallel with respect to airflow through the pressure relief assembly 100. The vent opening 146 can also be arranged to be geometrically parallel to the valve opening 145, in some embodiments. In some other embodiments, the vent opening 146 is geometrically non-parallel to the valve opening 145, such as where the vent opening 146 is at an oblique angle relative to the valve opening 145. Inyet other embodiments the vent opening 146 can be perpendicular to the valve opening 145.

[0030] In some embodiments, the pressure relief assembly 100 additionally includes a membrane cover 150. The membrane cover 150 is generally configured to obstruct elements from the external environment from impacting the breathable membrane 152. The membrane cover 150 is disposed across at least a portion of the breathable membrane 152. The membrane cover 150 defines a tortuous flow path 154 from the external environment through the vent opening 146. The term “tortuous flow path” is used to mean that the flow path from the external environment to the vent opening is not a straight line. The tortuous flow path 154 may be defined by any suitable structure. In the current example, the membrane cover 150 extends across the vent opening 146. The membrane cover 150 and the housing 140 define a cover opening 156 in direct fluid communication with the vent opening 146 through the first vent opening end 143a. The cover opening 156 and the vent opening 146 are generally not aligned. For example, the cover opening 156 is offset from the vent opening 146. In the current example, the cover opening 156 has a different orientation than the vent opening 146.

[0031] The membrane cover 150 can be constructed of a variety of materials and combinations of materials including plastic, metal, wood, and the like. The membrane cover 150 can be constructed of similar or different materials than the housing 140. The membrane cover 150 can define any suitable fittings that allow for coupling to the housing 140. In the current example, the membrane cover 150 can form a snap-fit connection with the housing. In some other embodiments, the membrane cover 150 includes threading configured to engage the housing 140 around at least a portion of the breathable membrane 152. In some embodiments, the membrane cover 150 forms a mating structure that is configured to mate with a corresponding structure defined by the housing 140. As another example, the membrane cover 150 can define a connector that interlocks with the housing about the vent opening 146, such as a bayonet connector. In some embodiments, the membrane cover can be coupled to the housing 140 around the vent opening 146 with an adhesive.

[0032] The valve body 130 is generally configured to be coupled to the housing 140 across a valve opening 145. The valve body 130 is generally configured to accommodate pressure release from an enclosure to which the pressure reliefassembly 100 is coupled. The valve body 130 is generally configured to accommodate pressure release from the second end 182 to the first end 180 of the housing 140 upon a minimum pressure differential between the first end 180 and the second end 182 of the housing 140. The valve body 130 can be constructed of a variety of materials and combinations of materials including plastic, metal, wood, and the like. In some embodiments, the valve body 130 is generally non-breathable and liquid impermeable. In the current example, the valve body 130 does not include one or more apertures. Also in the current example, the valve body 130 is constructed of a non-breathable material. In some other embodiments, the valve body includes one or more apertures, such as where the valve body defines the vent opening. In some such embodiments, a vent can be coupled to the valve body, which will be discussed in more detail below.

[0033] In some embodiments, the pressure relief assembly 100 has a valve seal 192 disposed between the valve body 130 and the housing 140. The valve seal 192 is configured to form a fluid seal between the valve body 130 and the housing 140 around the valve opening 145 under normal operating pressure. In some embodiments, the valve body 130 and the valve seal 192 form an integrated, unitary component. The valve seal 192 is configured to prevent airflow from bypassing the vent opening 146 through the housing 140 during normal operating conditions. Normal operating conditions mean the pressure differential across the interior of the housing 140 and the external environment does not exceed the minimum pressure differential.

[0034] The valve body 130 has a first end 134 and a second end 136. The valve body 130 has a spring adapter 138. The spring adapter 138 is generally configured to receive a second end 124 of the spring 120. In the current example, the spring adapter 138 is defined towards the first end 134 of the valve body 130. In the current example, the valve body 130 is disposed towards the first end 180 of the housing 140. In some other embodiments, the valve body 130 is disposed towards the second end 182 of the housing 140.

[0035] The spring 120 is generally compressibly disposed between the spring mount 110 and the valve body 130. In the current example, the spring 120 is compressibly disposed between the spring adapter 138 and the spring mount 110. The spring mount 110 is coupled to the housing 140 across the first end 180 of the housing 140. Thespring mount 110 is coupled to the first end 122 of the spring 120. The valve opening 145 can be positioned axially between the spring mount 110 and the coupling structure 142.

[0036] Both the spring adapter 138 and the spring mount 110 have a ring structure that the spring 120 may be disposed around. In such embodiments, the spring 120 is secured by the ring structures so that both ends of the spring 120 are prevented from moving out of the ring structures. The spring 120 may be secured by the ring structure via an interference fit, for example, the outer diameter DI of the ring structure is greater than or equal to the inner diameter D2 of the spring 120. In some other embodiments, the spring 120 may be secured on the valve body 130 and the spring mount 110 by adhesive, welds, or the like.

[0037] The spring 120 is generally configured to provide an expansion force on the valve body 130 towards the second end 182 of the housing 140 to form a seal around the valve opening 145. In such a configuration, the spring 120 is compressed between the spring adapter 138 and the spring mount 110, and the valve body 130 blocks fluid flow between the second end 182 of the housing 140 and the external environment through the environmental openings 148. The spring 120 generally maintains the valve body 130 in a position to obstruct the valve opening 145 until the expansion force is overcome by the minimum pressure differential that removes the valve body 130 from the valve opening 145. The spring 120 can be constructed of a variety of materials and combinations of materials including plastic, metal, and the like.

[0038] The spring constant of the spring 120 and the distance between the valve body 130 and the spring mount 110 defines the expansion force when the spring 120 is compressed between the valve body 130 and the spring mount 110. The spring constant of the spring 120 defines the minimum pressure differential required to remove the valve body 130 from the valve opening 145. In some embodiments, the spring 120 is a compression spring.

[0039] There are various factors that help define the minimum pressure differential that removes the valve body 130 from the valve opening 145. The area of the lateral profile of the valve body 130, the spring constant of the spring 120, the number of the spring 120, the axial distance between the spring mount 110 and the valve body 130 are all example factors that contribute to defining the minimum pressure differential that removes the valve body 130 from the valve opening 145.

[0040] In the current example, the spring mount 110 has a mating threading 112 in threaded engagement with the circumferential threading 149 of the housing 140. The spring mount 110 is generally configured to define the axial distance between the ends of the spring 120 to define the minimum pressure differential at which the valve body 130 unobstructs the valve airflow pathway 144a. The circumferential threading 149 is generally configured to define the axial distance between the spring mount 110 and the valve body 130 to define the axial distance between the ends of the spring 120. The axial distance between the ends of the spring 120 defines the minimum pressure differential required to overcome the spring force of the spring 120 to translate the valve body 130 away from the valve opening 145. The housing includes the circumferential threading 149 arounds a portion of the airflow pathway 144. The circumferential threading 149 can extend between the first end 180 and the second end 182. In some embodiments, the circumferential threading 149 extends axially from the first end 180 towards the second end 182. In some other embodiments, which will be discussed in more detail below, the circumferential threading 149 extends axially from the second end 182 towards the first end 180. In some embodiments, the spring mount 110 additionally defines a cap. The cap is configured to prevent the ingress of outside contaminants, such as water spray and debris, into the housing from the external environment. In some other embodiments, there is no cap.

[0041] In some embodiments, the circumferential threading 149 has an axial length LI that is greater than an axial length L2 of the mating threading 112. Such a configuration may advantageously accommodate axial translation of the spring mount 110 relative to the housing 140 to define various distances between the spring mount 110 and the valve body 130 via the circumferential threading 149. In some embodiments, LI is at least 2 mm. In some embodiments, LI is greater than 4 mm, greater than 6 mm, greater than 8 mm, greater than 10 mm, or greater than 15 mm. In some embodiments, LI is less than 20 mm, less than 15 mm, less than 10 mm, less than 8 mm, or less than 6 mm. In some embodiments, L2 is at least 1 mm. In some embodiments, L2 is greater than 2 mm, greater than 3 mm, greater than 4 mm, greater than 6 mm, greater than 8 mm, greater than 10 mm, or greater than 12 mm. In some embodiments, L2 is less than 15 mm, less than 10 mm, less than 8 mm, less than 6 mm, less than 4 mm, or less than 3 mm.

[0042] The minimum pressure differential is not particularly limited, but in some embodiments, the minimum pressure differential ranges from 40 mbar (.58 psi) to 100 mbar (1.45 psi), 50 mbar (0.73 psi) to 90 mbar (1.3 psi), or 60 mbar (.87 psi) to 80 mbar (1.16 psi). In one particular example, the minimum pressure differential ranges from 65 mbar (.94 psi) to 75 mbar (1.09 psi). However other ranges are certainly contemplated.

[0043] In some embodiments, the spring mount 110 is fixed to the housing 140. In such embodiments, the spring mount 110 is fixed to the housing 140 after the mating threading 112 is positioned in threaded engagement with the circumferential threading 149 to define a predetermined axial length of the spring, which in turn defines a predetermined minimum pressure differential. The spring mount 110 may be fixed to the housing 140 by any suitable method. For example, the spring mount 110 may be fixed to the housing 140 by adhesive, weld, rivet, or mechanical coupling structure such as a tab, or other types of mechanical coupling structures like a fastener such as a set screw or a bolt. When using a tab as a mechanical coupling structure, the tab could be fixed to the housing and folded over the spring mount after desired positioning of the spring mount to prevent rotation and / or translation movement between the housing and the spring mount. In some embodiments, the housing 140 and the spring mount 110 are directly bonded through a weld, such as a heat weld or ultrasonic weld.

[0044] FIGS. 3 and 4 depict another example of a pressure relief assembly 300 consistent with the technology disclosed herein. FIG. 3 is a cross-sectional view of the pressure relief assembly 300 and FIG. 4 is a cross-sectional perspective view of the pressure relief assembly 300 of FIG. 3. FIG. 3 also depicts an example enclosure 10, which the pressure relief assembly 300 is configured to be coupled to. As with the examples discussed above, the pressure relief assembly 300 generally includes a housing 340, a breathable membrane 352, a valve body 330, a spring mount 310, and a spring 320. Components of the pressure relief assembly 300 are generally consistent with the descriptions of the same components discussed elsewhere herein, unless contrary to the current description or figures.

[0045] The housing 340 is generally configured to sealably couple to the enclosure 10. The housing 340 is additionally configured to sealably couple to the valve body 330. The housing 340 generally has a first end 380 and a second end 382. The housing 340 generally includes a coupling structure 342, an airflow pathway 344 including avent airflow pathway 344b and a valve airflow pathway 344a, a vent opening 346 along the vent airflow pathway 344b, a valve opening 345 along the valve airflow pathway 344a, and circumferential threading 349 around the airflow pathway 344. In the current example, the housing 340 has an axial sidewall 341 that extends in the axial direction from the coupling structure 342 to the first end 380 of the housing. In some embodiments, the housing 340 has an axial sidewall 341 that extends in the axial direction from the second end 382 to the first end 380 of the housing. The axial sidewall 341 surrounds the valve body 330, the spring 320, and the spring mount 310.

[0046] The coupling structure 342 is generally configured to be coupled to the enclosure 10 (shown in FIG. 3) about an enclosure opening 20. The coupling structure 342 can be any suitable configuration to engage the enclosure 10, as has been discussed in detail above. A housing seal 394 is configured to be disposed between the housing 340 and the enclosure 10 (shown in FIG. 3) to create a seal region between the housing 340 and the enclosure when the pressure relief assembly 300 is coupled to the enclosure. The housing seal 394 generally surrounds a portion of the airflow pathway 344. The housing seal 394 is positioned towards the second end 382 in the example currently depicted. The coupling structure 342, including the housing seal 394 can have configurations and alternate configurations that have been described elsewhere herein.

[0047] In the current example, the coupling structure 342 surrounds a portion of the airflow pathway 344. The valve airflow pathway 344a is selectively obstructed by the valve body 330. The valve body 330 is configured to relieve pressure along the valve airflow pathways 344a when the pressure between the first end 380 and the second end 382 of the housing 340 exceeds a minimum pressure differential. When the pressure differential between the first end and the second end of the housing does not exceed the minimum pressure differential the valve airflow pathway 344a remains obstructed by the valve body 330.

[0048] The vent opening 346 is positioned along the vent airflow pathway 344b. In the current example, the vent openings 346 are spaced around an axis x extending in the axial direction. The axis x can be a central axis of the housing 340. Also in the current example, the vent openings 346 are disposed between the valve opening 345 and the coupling structure 342 in the axial direction. In the current example, the vent opening 346 is perpendicular to the valve opening 345. The vent opening 346 and thevalve opening 345 can have configurations and alternate configurations that have been described elsewhere herein.

[0049] In the current example, the vent opening 346 generally surrounds a portion of the vent airflow pathway 344b defined by a sidewall of the housing 340 that extends from the interior of the housing 340 to the external environment. The breathable membrane 352 is coupled to the housing 340 across the vent opening 346. The breathable membrane 352 can have configurations and alternate configurations that have been described elsewhere herein. In the current example, there is no membrane cover disposed across the breathable membrane 352.

[0050] The axial sidewall 341 defines one or more environmental openings 348. The environmental openings 348 can be any suitable configuration to define a portion of the airflow pathway 344, for example, the vent airflow pathway 344b between the housing 340 and the external environment, as has been discussed in detail above.

[0051] The valve body 330 is generally configured to be coupled to the housing 340 across the valve opening 345 under normal operating conditions. The valve body 330 is generally configured to accommodate pressure release from an enclosure 10 to which the pressure relief assembly 300 is coupled. The valve body 330 is generally configured to accommodate pressure release from the second end 382 to the first end 380 through the housing 340. The valve body 330 is configured to be coupled to one end of a spring 320.

[0052] The spring 320 is compressibly disposed between the valve body 330 and the spring mount 310. The valve body 330 can have configurations and alternate configurations that have been described elsewhere herein. In some embodiments, the pressure relief assembly 300 has a valve seal 392 disposed between the valve body 330 and the housing 340. In the current example, the housing 340 includes the valve seal 392 which is configured to form a fluid seal with the valve body 330 around the valve opening 345. The valve seal 392 can have configurations and alternate configurations that have been described elsewhere herein.

[0053] As with the example discussed above with respect to FIGS. 1-2, the spring 320 is compressibly disposed between a spring adapter 338 and the spring mount 310. The spring 320, the spring mount 310, the spring adapter 338, and the interface between the spring adapter 338 and the housing 340 can have configurations and alternate configurations that have been described elsewhere herein.

[0054] FIG. 5 depicts a cross-sectional perspective view of yet another example of a pressure relief assembly 500 consistent with the technology disclosed herein. The pressure relief assembly 500 generally includes a housing 540, a breathable membrane 552, a valve body 530, a spring mount 510, and a spring 520. Components of the pressure relief assembly 500 are generally consistent with the descriptions of the same components discussed elsewhere herein, unless contrary to the current description or figure.

[0055] The housing 540 is generally configured to sealably couple to the enclosure (not shown in FIG. 5). The housing 540 is additionally configured to sealably couple to the valve body 530. The housing 540 generally has a first end 580 and a second end 582. In the current example, the housing 540 includes a coupling structure 542, an airflow pathway 544, a valve opening 545, an environmental opening 548, and circumferential threading 549 that surrounds a portion of a valve airflow pathway 544a. The housing 540 has an axial sidewall 541 that extends in the axial direction from the coupling structure 542 towards the first end 580 of the housing. The axial sidewall 541 surrounds a portion of the valve body 530, the spring 520, and the spring mount 510.

[0056] The coupling structure 542 can have configurations and alternate configurations that have been described elsewhere herein. In some embodiments, the coupling structure 542 includes a housing seal 594. The housing seal 594 can have configurations and alternate configurations that have been described elsewhere herein.

[0057] The valve body 530 is generally configured to be coupled to the housing 540 across the valve opening 545. The valve body 530 is generally configured to accommodate pressure release from an enclosure to which the pressure relief assembly 500 is coupled. The valve body 530 is generally configured to accommodate pressure release from the second end 582 to the first end 580 through the housing 540. The valve body 530 is coupled to one end of a spring 520. The spring 520 is compressibly disposed between the valve body 530 and the spring mount 510. In the current example, the spring mount 510 includes one or more apertures 514. The aperture 514 defines the valve airflow pathway 544a.

[0058] The valve body 530 is generally configured to obstruct the valve airflow pathway 544a across the valve opening 545 under normal operating conditions. During normal operating conditions, there is fluid communication between theenclosure and the external environment through the vent opening 546 via the vent airflow pathway 544b. The valve airflow pathway 544a is selectively obstructed by the valve body 530, where the valve body 530 is configured to un-obstruct the valve airflow pathway 544a upon the minimum pressure differential across the valve opening 545. For example, once the minimum pressure differential across the valve opening 545 is reached, the valve body 530 and the valve seal 592 positioned in the valve body 530 are pushed toward the first end 580 of the housing. In such a configuration, the valve body 530 un-obstructs the valve airflow pathway 544a.

[0059] In some embodiments, the valve body 530 has a first end 534 and a second end 536. The valve body 530 further has a spring adapter 538. The spring mount 510 is coupled to the valve body 530. In the current example, the valve body 530 is linearly translatable relative to the spring mount 510. The spring 520 is compressibly disposed between the valve body 530 and the spring mount 510.

[0060] In the current example, the valve body 530 includes a vent opening 546. The breathable membrane 552 is coupled to the valve body 530 and disposed across the vent opening 546. The vent opening 546 is positioned toward the first end 534 of the valve body 530 and across the vent airflow pathway 544b. The vent opening 546 is generally configured to define a fluid communication pathway between the enclosure and the external environment. The vent opening 546 is also generally configured to define a fluid communication pathway between the interior of the housing 540 and the external environment. The vent opening 546 defines a portion of the airflow pathway 544, for example the vent airflow pathway 544b, between the interior of the housing 540 and the external environment. The vent opening 546 generally allows fluid communication between the interior of the housing 540 and the external environment via the vent airflow pathway 544b. The pressure relief assembly 500 in the current example has only one vent opening. In some other embodiments, the pressure relief assembly 500 has a plurality of vent openings. In the current example, the vent opening 546 is positioned centrally to the valve body 530. The vent opening 546 extends across the vent airflow pathway 544b and towards the first end 534 of the valve body 530. The vent opening 546 and the valve opening 545 can have configurations and alternate configurations that have been described elsewhere herein.

[0061] In the current example, the valve body 530 includes an obstruction portion 533 and a valve stem 531. This is distinguishable from previous examples where the valvebody lacks a stem. The valve stem 531 extends in the axial direction from the second end 536 towards the first end 534 of the valve body 530. The valve stem 531 has a distal end 535, that is the second end 536 of the valve body 530, and a proximal end 537, towards the first end 534 of the valve body 530. The vent airflow pathway 544b is defined by the valve stem 531 and the obstruction portion 533. Also distinguishable from previous examples, a portion of the length of the vent airflow pathway 544b defined by the valve stem 531 is surrounded by the valve airflow pathway 544a. In the current example, a portion of the axial length of the vent airflow pathway 544b is within the valve airflow pathway 544a.

[0062] The axial sidewall 541 generally defines one or more environmental openings. In the current example, the axial sidewall 541 and valve body 530 mutually define the environmental opening 548. In some embodiments, the pressure relief assembly 500 has a valve seal 592 disposed between the valve body 530 and the housing 540. The valve seal 592 is configured to prevent airflow from bypassing the vent opening 546 through the valve body 530 during normal operating conditions. In the current example, the valve seal 592 is configured to form a fluid seal between the housing 540 the valve body 530 around the environmental opening 548. The valve seal 592 in the current example is positioned and secured in a circumferential slot defined by the valve body 530. In such a configuration, the valve seal 592 moves simultaneously along the axial direction with the valve body 530. The environmental opening 548 and the valve seal 592 can have configurations and alternate configurations that have been described elsewhere herein.

[0063] A spring 520 is compressibly disposed between the valve body 530 and the spring mount 510. The valve body 530 further includes a spring adapter 538. In the current example, the spring 520 is compressibly disposed between the spring adapter 538 and the spring mount 510. In the current example, the spring adapter 538 is an annular disk structure extending outward from the valve stem 531. The spring 520 is configured to be coupled to the spring adapter 538. In such embodiments, the spring 520 is disposed around the valve stem 531 so that the spring 520 is prevented from moving away from the valve stem 531. In some embodiments, the spring 520 may be secured by the spring adapter 538 via a slot fitting, for example, the spring 520 is inserted into the slot in the disk structure of the spring adapter 538 as shown in FIG. 5. The other end of the spring may be secured by the spring mount with a same slotfitting. In some other embodiments, the spring 520 may be secured to each of the spring adapter 538 and the spring mount 510 by adhesive, welds, or the like. The spring 520 is configured to provide an expansion force when compressed between the valve body 530 and the spring mount 510, generally maintaining the valve body 530 in a position to obstruct the valve opening until the expansion force is overcome by the minimum pressure differential that removes the valve body 530 from the valve opening 545. The spring 520, the spring mount 510, and the spring adapter 538 can have configurations and alternate configurations that have been described elsewhere herein.

[0064] The housing 540 includes the circumferential threading 549 generally surrounds a portion of the valve airflow pathway 544a. The spring mount 510 has a mating threading 512 in threaded engagement with the circumferential threading 549. The circumferential threading 549 is generally configured to define the axial distance between the spring mount 510 and the valve body 530 to define the axial distance between the ends of the spring 520. The mating threading 512 and the circumferential threading 549 can be consistent with the mating threading and circumferential threading described in detail elsewhere herein. In some embodiments, the circumferential threading 549 extends axially from the second end 582 towards the first end 580. In some other embodiment, the circumferential threading 549 extends axially from the first end 580 towards the second end 582. In some embodiments, the circumferential threading 549 has an axial length LI that is greater than an axial length L2 of the mating threading 512. The axial distance between the ends of the spring 520 defines the minimum pressure differential required to translate the valve body 530 to unobstruct the valve opening 545. In some embodiments consistent with the present example, the spring mount 510 defines an opening 516 that the valve stem 531 extends through. The current example, the opening 516 is centrally located relative to the spring mount 510. In some embodiments, the opening 516 and the distal end 535 of the valve stem 531 are sized such that the distal end 535 can be inserted through the opening 516. In this example, the spring mount 510 is not spaced in the axial direction from the entire valve body but a portion of the valve body. In some other embodiments, the opening 516 does not extend centrally through the spring mount 510. In the current example, the mating threading 512, the circumferential threading 549, and the coupling structure 542 surround a portion ofthe vent airflow pathway 544b. This is distinguishable from previous examples where the mating threading and the circumferential threading do not surround a portion of the vent airflow pathway.

[0065] In various embodiments, the pressure relief assembly further has a cap 560 coupled to the housing 540. The cap 560 is configured to prevent the ingress of outside contaminants, such as water spray and debris, into the enclosure from the external environment. The cap 560 can be constructed of a variety of types of materials and combinations of materials including plastic, metal, ceramic, wood, and the like. In some embodiments, the cap 560 is constructed of the same material as the housing 540.

[0066] Some aspects of the present technology relate to a method of manufacturing a vent assembly. FIG. 6 depicts an example method 600 consistent with the technology disclosed herein. Consistent with some implementations of the present technology, a valve body is disposed across a valve opening 610. The housing is threadably engaged with a spring mount 620. A breathable membrane is disposed across the vent opening 630. A spring is compressibly disposed between the valve body and the spring mount 640. The spring mount is rotated relative to the housing 650.

[0067] The valve body is disposed across the valve opening 610, which is defined by a housing. In some embodiments, the valve body is inserted into the housing. The valve body, housing, and valve opening can be consistent with discussions elsewhere herein. The housing is threadably engaged with a corresponding engaging surface of a spring mount 620. The spring mount can be consistent with spring mounts discussed elsewhere herein. In various embodiments, the spring mount is inserted into the housing. In some embodiments, such as that described above with reference to FIG. 5, a portion of the valve is inserted through the spring mount. A breathable membrane is disposed across the vent opening 630. The breathable membrane can be consistent with discussions elsewhere herein. A spring is compressibly disposed between the valve body and the spring mount 640. In some embodiments, the spring is more specifically disposed between a spring adapter of the valve body and a valve obstruction of the valve body. The spring adapter can be consistent with spring adapters discussed above. For example, the spring adapter can be defined by an obstruction portion of the valve body (such as described above with respect to FIGS. 1-4), and in other examples the spring adapter can be defined along a valve stem ofthe valve body (such as described above with respect to FIG. 5). Other configurations are also contemplated.

[0068] In some embodiments, a breathable membrane is disposed across a vent opening. The vent opening can be defined by the housing in some embodiments, and in other embodiments the vent opening can be defined by the valve. The breathable membrane may be coupled to a vent opening via any suitable method, which has been discussed in detail elsewhere herein. In some such embodiments, a membrane cover is disposed across the breathable membrane. The membrane cover can be coupled to the housing through approaches discussed elsewhere herein.

[0069] In some embodiments, a cap is coupled to the housing. In some embodiments, the spring mount defines the cap. In such examples, coupling the cap to the housing includes threadably engaging the housing and the spring mount. In some other examples, the cap is a separate component from the spring mount. In such examples, the cap can define any suitable fittings that allow for coupling to the housing. In some embodiments, the cap is snap-fitted to the housing. In some other embodiments, the cap is threadably engaged with the housing. In some embodiments, the cap is mated with a corresponding structure defined by the housing. As another example, the cap is interlocked with the housing about the valve opening, such as via a bayonet connector. In some embodiments, the cap is bonded to the housing around the vent opening with adhesive or through welding.

[0070] In some embodiments, a valve seal is disposed between the valve body and the housing. In some embodiments, a housing seal is disposed around a coupling structure defined by the housing.

[0071] The spring mount is rotated relative to the housing 650. The rotation results in axial translation of the spring mount relative to the housing. The axial translation of the spring mount relative to the housing results in a change in the compression force of the spring. The compression force of the spring defines the minimum pressure differential that removes the valve body from the valve opening.

[0072] The spring mount is fixed to the housing. The spring mount is generally fixed to the housing to fix the minimum pressure differential. The spring mount may be fixed to the housing by any suitable method. In some embodiments, the spring mount is fixed to the housing by adhesive bonding, welding, riveting, or fastening such as ascrew or a bolt. In some embodiments, the spring mount is heat welding on and the housing directly.Exemplary Aspects

[0073] Aspect 1. A pressure relief assembly comprising: a housing having a coupling structure configured to couple to an enclosure, an airflow pathway, a vent opening along the airflow pathway, a valve opening functionally parallel with the vent opening along the airflow pathway, and circumferential threading around the airflow pathway; a breathable membrane coupled to the housing across the vent opening; a valve body coupled to the housing across the valve opening; a spring mount coupled to the housing, wherein the spring mount has mating threading in threaded engagement with the circumferential threading; and a spring compressibly disposed between the valve body and the spring mount.

[0074] Aspect 2. The pressure relief assembly of any one of Aspects 1 and 3-13, wherein the spring mount is fixed to the housing.

[0075] Aspect 3. The pressure relief assembly of any one of Aspects 1-2 and 4- 13, wherein the circumferential threading has an axial length that is greater than an axial length of the mating threading.

[0076] Aspect 4. The pressure relief assembly of any one of Aspects 1-3 and 5- 13, wherein the coupling structure surrounds the airflow pathway.

[0077] Aspect 5. The pressure relief assembly of any one of Aspects 1-4 and 6- 13, wherein the housing and the spring mount are directly bonded through a weld.

[0078] Aspect 6. The pressure relief assembly of any one of Aspects 1-5 and 7- 13, wherein the housing and the spring mount are fixed via adhesive.

[0079] Aspect 7. The pressure relief assembly of any one of Aspects 1-6 and 8- 13, wherein the spring is a compression spring.

[0080] Aspect 8. The pressure relief assembly of any one of Aspects 1-7 and 9- 13, wherein the pressure relief assembly further comprises a membrane cover disposed across the breathable membrane.

[0081] Aspect 9. The pressure relief assembly of any one of Aspects 1-8 and 10- 13, wherein the pressure relief assembly further comprises a cap coupled to the housing.

[0082] Aspect 10. The pressure relief assembly of any one of Aspects 1-9 and 11-13, wherein the valve body has a first end and a second end, and the valve body further comprises a spring adapter disposed towards the second end of the valve body and a valve obstruction disposed towards the first end of the valve body.

[0083] Aspect 11. The pressure relief assembly of any one of Aspects 1-10 and 12- 13, wherein the pressure relief assembly further comprises a first seal disposed between the valve body and the housing.

[0084] Aspect 12. The pressure relief assembly of any one of Aspects 1-11 and 13, wherein the coupling structure comprises a second seal configured to be disposed between the housing and the enclosure.

[0085] Aspect 13. The pressure relief assembly of any one of Aspects 1-12, wherein the spring mount is spaced in an axial direction from the valve body.

[0086] Aspect 14. A method of manufacturing a vent assembly comprising: disposing a valve body across a valve opening defined by a housing; threadably engaging circumferential threading of the housing with mating threading of a spring mount; disposing a breathable membrane across a vent opening; compressibly disposing a spring between the valve body and the spring mount; and rotating the spring mount relative to the housing, resulting in axial translation of the spring mount and a change in the compression force of the spring.

[0087] Aspect 15. The method of any one of Aspects 14 and 16-22, further comprising fixing the spring mount to the valve body.

[0088] Aspect 16. The method of any one of Aspects 14-15 and 17-22, further comprising coupling the breathable membrane to the housing.

[0089] Aspect 17. The method of any one of Aspects 14-16 and 18-22, further comprising disposing a membrane cover across the breathable membrane.

[0090] Aspect 18. The method of any one of Aspects 14-17 and 19-22, further comprising coupling a cap to the housing.

[0091] Aspect 19. The method of any one of Aspects 14-18 and 20-22, wherein disposing the spring comprises positioning the spring between a spring adapter of the valve body and a valve obstruction of the valve body.

[0092] Aspect 20. The method of any one of Aspects 14-19 and 21-22, further comprising disposing a first seal between the valve body and the housing.

[0093] Aspect 21. The method of any one of Aspects 14-20 and 22, further comprising disposing a second seal around a coupling structure defined by the housing.

[0094] Aspect 22. The method of any one of Aspects 14-21, further comprising securing the spring mount to the housing.

[0095] It should also be noted that, as used in this specification and the appended claims, the phrase “configured” describes a system, apparatus, or other structure that is constructed to perform a particular task or adopt a particular configuration. The word "configured" can be used interchangeably with similar words such as “arranged”, “constructed”, “manufactured”, and the like.

[0096] All publications and patent applications in this specification are indicative of the level of ordinary skill in the art to which this technology pertains. All publications and patent applications are herein incorporated by reference to the same extent as if each individual publication or patent application was specifically and individually indicated by reference. In the event that any inconsistency exists between the disclosure of the present application and the disclosure(s) of any document incorporated herein by reference, the disclosure of the present application shall govern.

[0097] This application is intended to cover adaptations or variations of the present subject matter. It is to be understood that the above description is intended to be illustrative, and not restrictive, and the claims are not limited to the illustrative embodiments as set forth herein.

Claims

ClaimsWhat is claimed is:

1. A pressure relief assembly comprising: a housing having a coupling structure configured to couple to an enclosure, an airflow pathway, a vent opening along the airflow pathway, a valve opening functionally parallel with the vent opening along the airflow pathway, and circumferential threading around the airflow pathway; a breathable membrane coupled to the housing across the vent opening; a valve body coupled to the housing across the valve opening; a spring mount coupled to the housing, wherein the spring mount has mating threading in threaded engagement with the circumferential threading; and a spring compressibly disposed between the valve body and the spring mount.

2. The pressure relief assembly of claim 1, wherein the spring mount is fixed to the housing.

3. The pressure relief assembly of claim 1, wherein the circumferential threading has an axial length that is greater than an axial length of the mating threading.

4. The pressure relief assembly of claim 1, wherein the coupling structure surrounds the airflow pathway.

5. The pressure relief assembly of claim 1, wherein the housing and the spring mount are directly bonded through a weld.

6. The pressure relief assembly of claim 1, wherein the housing and the spring mount are fixed via adhesive.

7. The pressure relief assembly of claim 1, wherein the spring is a compression spring.

8. The pressure relief assembly of claim 1, wherein the pressure relief assembly further comprises a membrane cover disposed across the breathable membrane.

9. The pressure relief assembly of claim 1, wherein the pressure relief assembly further comprises a cap coupled to the housing.

10. The pressure relief assembly of claim 1, wherein the valve body has a first end and a second end, and the valve body further comprises a spring adapter disposed towards the second end of the valve body and a valve obstruction disposed towards the first end of the valve body.

11. The pressure relief assembly of claim 1, wherein the pressure relief assembly further comprises a first seal disposed between the valve body and the housing.

12. The pressure relief assembly of claim 1, wherein the coupling structure comprises a second seal configured to be disposed between the housing and the enclosure.

13. The pressure relief assembly of claim 1, wherein the spring mount is spaced in an axial direction from the valve body.

14. A method of manufacturing a vent assembly comprising: disposing a valve body across a valve opening defined by a housing; threadably engaging circumferential threading of the housing with mating threading of a spring mount; disposing a breathable membrane across a vent opening; compressibly disposing a spring between the valve body and the spring mount; and rotating the spring mount relative to the housing, resulting in axial translation of the spring mount and a change in the compression force of the spring.

15. The method of claim 14, further comprising fixing the spring mount to the valve body.

16. The method of claim 14, further comprising coupling the breathable membrane to the housing.

17. The method of claim 14, further comprising disposing a membrane cover across the breathable membrane.

18. The method of claim 14, further comprising coupling a cap to the housing.

19. The method of claim 14, wherein disposing the spring comprises positioning the spring between a spring adapter of the valve body and a valve obstruction of the valve body.

20. The method of claim 14, further comprising securing the spring mount to the housing.

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