EP4135858A1 - High-expansion foam generator having a nozzle with a solid nozzle insert with a non-sharp cross-over path - Google Patents
High-expansion foam generator having a nozzle with a solid nozzle insert with a non-sharp cross-over pathInfo
- Publication number
- EP4135858A1 EP4135858A1 EP21723535.7A EP21723535A EP4135858A1 EP 4135858 A1 EP4135858 A1 EP 4135858A1 EP 21723535 A EP21723535 A EP 21723535A EP 4135858 A1 EP4135858 A1 EP 4135858A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- foam
- nozzle
- generator
- header
- assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- 239000007787 solid Substances 0.000 title claims abstract description 10
- 230000007704 transition Effects 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000007921 spray Substances 0.000 claims description 17
- 230000001629 suppression Effects 0.000 claims description 13
- 239000012141 concentrate Substances 0.000 claims description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 9
- 230000000712 assembly Effects 0.000 claims description 8
- 238000000429 assembly Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 description 11
- 230000009467 reduction Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000005476 soldering Methods 0.000 description 5
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- 230000002411 adverse Effects 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- 229910000679 solder Inorganic materials 0.000 description 1
- 239000011493 spray foam Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C5/00—Making of fire-extinguishing materials immediately before use
- A62C5/02—Making of fire-extinguishing materials immediately before use of foam
- A62C5/022—Making of fire-extinguishing materials immediately before use of foam with air or gas present as such
- A62C5/024—Apparatus in the form of pipes
Definitions
- the present disclosure relates to fire extinguishing systems, and more particularly, to high-expansion foam generators used in fire suppression systems.
- Fire suppression systems in large enclosed areas can include high expansion foam systems to protect an enclosed area that quickly cover and/or fill the area with a foam solution, which is a mixture of a foam concentrate and a fire suppression fluid (e.g., water).
- a foam solution which is a mixture of a foam concentrate and a fire suppression fluid (e.g., water).
- high expansion foams may be more efficient in terms of cost and/or equipment than conventional sprinkler systems or foam systems with lower foam expansion ratios.
- the high expansion systems can include high expansion generators that are usually part of a fixed deluge or flow control system.
- the high expansion foam (HEF) generators are typically used in combination with a foam proportioning system that mixes a foam concentrate and fluid (e.g., water) to provide a foam solution at the proper concentrate to the nozzles of the foam generators.
- the nozzles spray the foam solution into the foam generator such that foam solution jet streams impinge on a portion of the foam generator having a plurality of openings.
- HEF generators can include fan-type generators, which force air through the foam generator assembly as the foam is generated, and aspirated-type foam generators, which draw air into the foam generator assembly due to a differential pressure between the surrounding atmosphere and the lower pressure in the foam generator. The lower pressure in the aspirated- type foam generator is created by the foam solution jet streams as they discharge from the nozzles.
- Aspirated-type generators as the foam solution discharged from a nozzle impinges upon a foaming plate, which can be a perforated plate or screen, to generate foam, the foam expands into a large volume of stable bubbles without the need for a forced- air system. Aspirated-type generators can be more efficient and lighter than forced air-type foam generators because a fan is not required.
- Conventional aspirated-type foam generators can include a header assembly having a nozzle manifold with a distribution header configured to receive a foam solution from, for example, a foam proportioning system.
- the distribution header of a foam generator can be a curved header that forms a circle, a spoke-type header, a linear header, or some combination thereof.
- the nozzle manifold can include a plurality of nozzle assemblies in which each nozzle assembly includes a nozzle for discharging the foam solution toward a foam generator assembly.
- the nozzles in some generators can have flat tips or conical tips.
- Some conventional nozzles can further include a nozzle insert to change the flow characteristics of the foam solution stream as it is discharged.
- the generator assembly is generally arranged proximate the nozzle manifold to receive the discharged foam solution and generate the foam.
- the foam generator includes a header assembly, which includes a header with nozzles, and a foam generator assembly. As the foam solution is sprayed from the header assembly, the foam generator of the ’773 patent draws air from the surrounding area into the foam generator to generate foam as the foam solution impinges upon a foaming plate or screen.
- the ’773 patent generator includes a circular header with emission nozzles that appear to have conical tips.
- KR100917277 Korean patent No. KR100917277
- KR277 purports to solve the problem of spray interference in conical-shaped foam generators by using a rectangular- shaped foam generator.
- the conical-shaped foam generator in KR277 has a header in which the nozzles extend outwardly from a central pipe in a spoke-type arrangement.
- the rectangular- shaped foam generator in KR77 uses a linear header in which the nozzles are arranged longitudinally along the header.
- the linear header includes attached nozzles that spray the foam solution into a rectangular body that then directs the foam solution to a tapered section including perforated screens or plates.
- the nozzles in KR277 have a flat tip and, at least for the rectangular- shaped foam generator, the nozzles include a vortex insert to twist the flow of the foam solution.
- known commercial aspirated-type foam generators (“known commercial generators”) can have foam expansion ratios in excess of 830:1.
- the known commercial generators can include a circular header for receiving the foam solution and, depending on the model, include 6 to 8 nozzles for discharging the foam solution.
- the nozzles of some known commercial generators can include a flat tip.
- the known commercial generators can be limited to nozzle inlet pressures in a range of 43.5 psi (3 bar) to 101 psi (7 bar) in order to achieve predetermined foam expansion ratios.
- KR277 discloses use of a nozzle insert and changing the shape to a foam generator to reduce spray interference, the above-described related art does not specifically teach techniques to increase the efficiency of a foam generator.
- These techniques can include improving the efficiencies of one or more components of a HEF foam generator, such as, for example, the relative dimensions of a foam generator assembly, the relative arrangement of a header assembly with respect to a foam generator assembly, the relative dimensions of a header assembly (including the shape of a header assembly), the relative arrangement of the nozzle with respect to the header, and/or the relative dimensions of a nozzle (including the shape of the nozzle and insert). It is believed that by increasing the efficiency of one or more components of a foam generator by using one or more of these techniques the overall efficiency of the foam generator can be increased. For example, while not being limited to any particular theory, the limited inlet pressure range of known foam generators can be due to inefficiencies in the design of one or more features of the foam generators.
- nozzle manifolds that include curved headers and/or manifolds that do not provide for enough distance between the manifold and nozzle inlet can introduce pressure variances that adversely affect the flow of the foam solution and the efficiency of the nozzles.
- nozzles with a flat tip and/or with an insert having slots, gaps and/or other similar features can introduce flow variances in the outlet jet stream that adversely affect the efficiency of the aspiration of the air.
- the over efficiency of foam generators can be improved such as, for example, by expanding the inlet pressure range of foam generators, reducing the number of nozzles needed to generate a given volumetric foam flow rate, and/or using less foam solution than related art foam generators.
- a high-expansion foam generator includes a nozzle manifold that is configured to receive a foam solution.
- the high-expansion foam generator preferably also includes one or more nozzles attached to the nozzle manifold.
- the high-expansion foam generator can be an aspirated-type foam generator in which the one or more nozzles are configured to discharge the foam solution such that a jet stream of the foam solution aspirates surrounding air into the foam generator due to a differential pressure between the surrounding atmosphere and the lower pressure in the foam generator created by the foam solution jet streams.
- the high-expansion foam generator includes a foam generator assembly and a ratio of a largest inlet dimension of the foam generator assembly to a length of the foam generator assembly is 0.50 or less.
- the high-expansion foam generator is configured to generate foam at a predetermined flow rate that can be, for example, at a rate of at least 1,000 cubic feet per minute (CFM), at a rate of at least 2,000 CFM, at a rate of at least 2,900 CFM, at a rate of at least 4,000 CFM, at a rate of at least 9,000 CFM, at a rate of 10,000 CFM, and/or at a rate of at least 12,500 CFM.
- the high-expansion foam generator can generate the foam at the predetermined flow rate with less than six nozzles, more preferably with four nozzles or less, and even more preferably with three nozzles or less.
- the high-expansion foam generator is configured to generate foam at a foam expansion ratio that is in a predetermined range for a nozzle inlet pressure in a range of 29 psi (2 bar) to 101 psi (7 bar).
- the predetermined expansion ratio can be in a range of 400 to 1100, more preferably in a range of 400 to 1000, even more preferably in a range of 400 to 900, and still more preferably in a range of 400 to 800.
- the high-expansion foam generator generates foam at an expansion ratio of at least 400 for a nozzle inlet pressure of 40 psi (2.76 bar) or less.
- the nozzle manifold includes at least two headers that are connected to each other.
- the headers can have linear configurations with at least two headers being disposed orthogonal to each other.
- one or more nozzle housings are disposed on each header with each nozzle housing configured to receive a nozzle.
- a ratio of a diameter of an inlet of the respective nozzle to a distance from an inner wall surface of the corresponding header to the inlet of the respective nozzle is 0.8 or less.
- the nozzle tip can be cone shaped with a tip surface of the nozzle forming an angle with a base of the nozzle that is in a range of 40 degrees to 50 degrees.
- the nozzle can include a nozzle insert that includes two swirl vanes that split a flow path of the foam solution into two curvilinear paths through the nozzle.
- Each flow path preferably includes a crossover path that transitions the respective flow path from a downstream side of a swirl vane to an upstream side of the other swirl vane.
- the crossover path is defined by a non-sharp transition member such as, for example, a chamfer, in the nozzle insert.
- the method includes providing a first foam generator portion having a tapered configuration and a second foam generator portion having a tapered configuration.
- the second foam generator portion is connected to an apex of the first foam generator portion and protrudes into an interior of the first foam generator portion.
- the method further includes generating a foam by spraying a foam solution against the first and second foam generator portions.
- respective jet streams from the one or more nozzles aspirate the surrounding air due to a differential pressure between the surrounding atmosphere and the lower pressure in the foam generator created by the foam solution jet streams.
- the method is performed using less than six nozzles.
- some exemplary methods include providing a foam solution that is in a lamina! flow region to one or more nozzles.
- a method for generating high-expansion foam can include generating foam at a foam expansion ratio of at least 400 at a nozzle inlet pressure of 40 psi (2.76 bar) or less.
- the generating of the foam is at a rate of at least 4,000 CFM.
- Some exemplary embodiments can include an HEF generator with nozzles in a range of 0.5 to 0.6 GPM/(psi) 1 ⁇ 2 K-factor that can meet or exceed the expansion ratios of related art generators with nozzles in a range of 1.25 to 1.35 GPM/(psi) 1 ⁇ 2 .
- an HEF generator with nozzles in a range of 0.5 to 0.6 GPM/(psi) 1 ⁇ 2 K-factor that can meet or exceed the expansion ratios of related art generators with nozzles in a range of 1.25 to 1.35 GPM/(psi) 1 ⁇ 2 .
- Some exemplary embodiments can include an HEF generator having one or more of the following that allow for generation of foam at a rate of at least 2000 CFM and at a spray inlet pressure of 40 psi or less: number of nozzle assemblies being less than six; at least one main header that receives a foam solution from an external source and at least one sub-header that is connected to the at least one main header and configured to receive the foam solution from the at least one main header, with the at least one main header and the at least one sub-header having linear configurations and with the at least one sub-header being disposed orthogonal to the at least one main header; a tip of each nozzle having a cone shape; each nozzle insert including swirl vanes that split a flow path of the foam solution through the respective nozzle into at least two curvilinear paths that have solid surfaces, with each curvilinear path including a crossover path that transitions the respective flow path from a downstream side of a swirl vane to an upstream side of another swirl vane, and with the crossover path being defined by
- FIG. 1 illustrates a perspective view of a high expansion foam generator in accordance with an embodiment of the present invention
- FIG. 2 is a cross-sectional view of the high expansion foam generator of Figure 1;
- FIG. 3 is an exploded view of the high expansion foam generator of Figure 1 ;
- FIG. 4 is a perspective view of a nozzle manifold in accordance with an embodiment of the present invention.
- FIG. 5 is a front cross-sectional view of the nozzle manifold of Figure 4;
- FIGS. 6 and 6A are a side cross-sectional view of the nozzle manifold of the Figure 4 and an expanded view of the interface between the nozzle manifold and a nozzle, respectively;
- FIG. 7 is a front cross-sectional view of a nozzle and insert in accordance with an embodiment of the present invention.
- FIG. 8 is a front cross-sectional view of the nozzle of Figure 7, with the insert removed;
- FIG. 9 is a perspective view of the nozzle insert of Figures 7 and 8; and [0024] FIG. 10 is a side view of the nozzle insert of Figures 7-9. Detailed Description
- Embodiments of the present invention are directed to an aspirated-type high- expansion foam generator.
- an "aspirated-type high-expansion foam generator” means a foam generator that has no moving parts and uses aspirated air as the primary means to generate foam. For example, rather than forcing air into the foam generators by using motor-operated or water-operated fans, the foam generator draws in the surrounding air into the foam generator.
- Figure 1 illustrates a perspective view of a high expansion foam (HEF) generator 10 in accordance with an embodiment of the present invention.
- Figure 2 is a cross-sectional view of the HEF generator 10
- Figure 3 is an exploded view of the HEF generator 10.
- the HEF generator 10 can preferably be configured to provide fire protection to an enclosure (e.g., a hangar, warehouse, cargo area, a large space, or another volume sufficient to hold the foam) by generating a fire suppression foam using a foam solution containing a fluid (e.g., water) and a foam concentrate.
- the HEF generator 10 can provide fire protection to an enclosure in compliance with Underwriters Laboratories (UL) Standard "UL 139 Outline of Investigation for Medium- and High-Expansion Foam" dated March 13, 2018 (“UL 139”), which is incorporated herein by reference in its entirety.
- UL Underwriters Laboratories
- the HEF generator must generate foam at the foam expansion ratio and/or within the foam expansion ratio range that has been approved by the UF testing authority.
- the HEF generator 10 can receive the foam solution from an external source such as, for example, foam proportioning system 25.
- the foam proportioning system 25 can create the foam solution by mixing a fire suppression foam concentrate (e.g., a commercially available concentrate) and a fire suppression fluid (e.g., water).
- the foam proportioning system can include one or more tanks to hold the foam concentrate and/or the fire suppression fluid.
- the source of the fire suppression fluid can be the municipal water system instead of a tank.
- the foam proportioning system 25 can include a pump to pump fire suppression fluid (e.g., water) and/or the foam concentrate.
- the foam proportioning system 25 can also include a proportioner that receives and mixes (e.g., by a venturi effect) the fire suppression fluid and the foam concentrate to generate the foam solution. The foam solution is then pumped, e.g., by using the pump, to the HEF generator 10. Foam proportioning systems that generate foam solutions are known in the art and thus, for brevity, will not be further discussed.
- the HEF generator 10 preferably includes a solution discharge assembly 200 and a foam generator assembly 100.
- the solution discharge assembly 200 includes a nozzle manifold 220 and one or more nozzle assemblies 240.
- the nozzle manifold 200 preferably includes one or more headers (e.g., a main header 224 and sub-headers 230a, b - see Fig. 4) and one or more nozzle housing 234 disposed on each header.
- the nozzle manifold 220 is preferably configured to receive the foam solution from the foam proportioning system 25 and distribute the foam solution to the one or more nozzle assemblies 240.
- Each nozzle assembly 240 preferably includes a nozzle 250 and/or a nozzle insert 260.
- the nozzle 250 attaches to the nozzle housing 234 and the nozzle 250 is preferably configured to discharge the foam solution into the foam generator assemblylOO.
- the HEF generator 10 is configured as an aspirated-type high-expansion foam generator. That is, in contrast to some prior art systems, exemplary embodiments of the present disclosure do not rely on a motor-operated fan and/or a water operated fan to force air into the body of the foam generator.
- the jet streams from the nozzles 250 aspirate air into the foam generator assemblylOO due to a differential pressure between the surrounding atmosphere and the lower pressure in the foam generator created by the foam solution jet streams.
- exemplary embodiments of the HEF generator 10 have no moving parts.
- the HEF generator 10 can include a gap G between the outlet of the one or more nozzles 250 and the inlet 112 of the foam generator assembly 100 to facilitate the entry of air into the foam generator assembly 100.
- the nozzle manifold 220 can include manifold support arms 222 that attach (e.g., using fasteners 218, welding, or via some other attachment means) to the foam generator assembly 100 at, for example, appropriate attachment locations on the foam generator body (e.g., main body portion 110).
- the manifold support arms 222 can be configured such that, when the nozzle manifold 220 is attached to the foam generator body, the nozzle manifold 220 is disposed a predetermined distance from the foam generator body.
- the predetermined distance is such that the gap G is in a range of 6.5 in. (165 mm) to 12 in. (305 mm). In some embodiments, the gap G is in a range of 6.5 in.
- the gap G is in a range of 9.5 in. (241 mm) to 10.5 in. (267 mm), and more preferably 10 in. ⁇ 0.25 in (254 mm ⁇ 5 mm).
- manifold support arms 222 as a means of attachment and other means can be used to maintain a predetermined distance between the discharge assembly 200 and the foam generator assembly 100.
- the discharge assembly 200 is attached and/or aligned to the foam generator assembly 100 such that the foam generator assembly 100 and the one or more nozzle assemblies 230 are aligned along an axis FI, which corresponds to a centerline of the foam generator assembly 100.
- the axis FI corresponds to an average flow path of the foam solution.
- the foam generator assembly 100 preferably receives the foam solution sprayed from the discharge assembly 200 and the aspirated air to generate a fire suppression foam that can be discharged into an enclosure to be protected.
- the overall length LI of the foam generator assembly 100 can be in a range of 50 in. (1270 mm) to 85 in. (2159 mm).
- the length LI can be in a range of 50 in. (1270 mm) to 55 in. (1397 mm), and more preferably 53 in. ⁇ 1 in. (1346 mm ⁇ 25 mm).
- the length LI can be in a range of 72 in. (1829 mm) to 85 in. (2159 mm), and more preferably 79 in. ⁇ 1 in. (2007 mm ⁇ 25 mm).
- a ratio of the gap G to the length LI is 0.125 or greater, more preferably in a range of 0.125 to 0.132, and even more preferably 0.127 ⁇ 1.
- the foam generator assembly 100 can be segmented into two or more portions.
- the foam generator assembly 100 can include a main body portion 110 and a foam generator portion 120, which preferably attaches to the body portion 110.
- the body portion 110 preferably defines a passageway in which the foam solution travels prior to impinging on a surface of the foam generator portion 120.
- the body portion 110 can include an inlet end 112 that receives the foam solution from the nozzle assemblies 240 and the aspirated air.
- the body portion 110 can also include a distal end 114 that is proximate to the foam generator portion 120.
- the body portion 110 attaches to the foam generator portion 120 at the distal end 114 (e.g., via soldering, welding, fasteners, bonding, and/or some other attachment means).
- the discharge assembly 200 is preferably disposed such that the outlet of the one or more nozzles 250 is at a predetermined distance from the inlet 112 of the foam generator assembly 100.
- the body portion 110 has a length L2 that is in a range of 25 in. (635 mm) to 45 in. (1143 mm). In some embodiments, the length L2 can be 25 in. (635 mm) to 30 in. (762 mm), and more preferably 27.5 ⁇ 1 in. (699 mm ⁇ 25 mm).
- the length L2 can be 40 in. (1016 mm) to 43 in (1092 mm), and more preferably 41.75 in. ⁇ 1 in. (1060 mm ⁇ 25 mm).
- the body portion 110 can include one or more expansion joints (not shown) near the inlet 112 and/or the distal end 114 to mitigate stresses in the interfaces between the body portion 110 and the manifold assembly 220 and/or between the body portion 110 and the foam generator portion 120.
- the body portion 110 is a tube that directs the foam solution towards the foam generator portion 120.
- the body portion 110 can have a cylindrical shape with a diameter D1 that is in a range of 21 in.
- the diameter D1 can be in a range of 23 in (584 mm) to 25 in (635 mm), and even more preferably 24 in. ⁇ 0.1 in. (610 mm ⁇ 2.5 mm). In other embodiments, the diameter D1 can be in a range of 35 in. (889 mm) to 37 in. (940 mm), and even more preferably 36 ⁇ 0.5 in. (914 mm ⁇ 13 mm).
- a length of the foam generator assembly is dependent on the inlet dimension. In some embodiments, a ratio of the largest inlet dimension of the foam generator assembly to a length of the foam generator assembly (also referred to herein as "generator ratio”) is 0.5 or less.
- the generator ratio can be in a range of 0.40 to 0.50, more preferably in a range of 0.42 to 0.48 and even more preferably a ratio of 0.46 ⁇ 0.01.
- the generator ratio is a ratio of diameter D1 to length LI.
- the body portion 110 can have other shapes such as, for example, rectangular (e.g., square), triangular, trapezoidal, or some other polygonal shape that allows for the foam solution spray to pass through to the foam generator portion 120 while bounding the spray within the interior of the body portion 110.
- the largest inlet dimension can be used in the numerator of the generator ratio equation. For example, if the inlet to the foam generator is rectangular in shape, the largest length dimension is used.
- the body portion 110 can be made of sheet metal and have an appropriate thickness for the material being used and can be, for example, a standard thickness such as, e.g., 1/32 in. (0.8 mm).
- the sheet metal can be stainless steel and/or another appropriate metal.
- the body portion 110 is not limited to a metal construction and other materials can be used (e.g., composites, plastics, ceramics, and/or another appropriate material) and the thickness will vary as appropriate.
- the body portion 110 is configured to attach to a fixed structure such as, for example, a wall, ceiling, roof, floor, platform, or other fixed structure using means of attachments such as, for example, brackets, bolts, screws, welding, soldering, bonding, or other means of attachment.
- the foam generator portion 120 receives the foam solution from the body portion 110 and is configured to generate a fire suppression foam that is discharged into the enclosure to be protected.
- the foam generator portion 120 is generally tube shaped.
- the foam generator portion 120 can preferably have a conical shape and even more preferably in the shape of a frustum cone.
- the foam generator portion 120 can be segmented into two or more parts.
- the foam generator portion 120 can include an exterior segment 122 and an interior segment 124.
- the exterior segment 122 and/or the interior segment 124 can have a tapered shape in some embodiments.
- the exterior segment 122 can have a conical shape such as, for example, a frustum cone with an inlet end 126 that is attached and/or otherwise secured to the body portion 110 and a distal end 127.
- the wall of the exterior segment 122 defines an interior 125.
- the interior segment 124 preferably has a conical shape and, in some embodiments, can be a frustum cone.
- the segments 122 and 124 are arranged such that interior segment 124 is disposed in the interior 125 of the exterior segment 122 and a base 128 of the interior segment 124 is attached to the distal end 127 of the exterior segment 122 (e.g., by soldering, welding, bonding, fastening via screws or bolts, or attaching by some other means).
- the foam generator portion 120 By segmenting the foam generator portion 120 into two or more parts, the surface area on which the foam solution impinges can be increased while minimizing the overall dimensions of the HEF generator 10.
- exemplary embodiments of the present disclosure are not limited to foam generator portions that are segmented into parts and/or limited to conical shapes or frustum shapes.
- the foam generator portion 120 can be a single part (e.g., made from a single piece of sheet metal) and/or have other shapes such as, for example, rectangular (e.g., square), triangular, trapezoidal, and/or some other polygonal shape (with or without a frustrum).
- the inlet 126 of the foam generator portion 120 can have a diameter that is approximately the same as the diameter at the distal end 114 of the body portion 110.
- the diameter D2 at the inlet 126 can be in a range of 21 in. (533 mm) to 38 in (965 mm).
- the diameter D2 can be in a range of 23 in (584 mm) to 25 in (635 mm), and even more preferably 24 in. ⁇ 0.1 in. (610 mm ⁇ 2.5 mm).
- the diameter D2 can be in a range of 36 in. (914 mm) to 37 in. (940 mm), and even more preferably 36.5 ⁇ 0.1 in.
- the length L3 of the exterior segment 122 (and, in some embodiments, the overall length of the foam generator portion 120) along the axis FI is in a range of 23 in. (584 mm) to 40 in. (1016 mm).
- the length L3 can be in a range of 24. 5 in. (622 mm) to 26.5 in. (673 mm), and more preferably 25.5 in. ⁇ 0.1 in. (648 mm ⁇ 2.5 mm).
- the length L3 can be in a range of 35 in. (889 mm) to 37 in. (940 mm), and more preferably 36 in. ⁇ 0.1 in. (914 mm ⁇ 2.5 mm).
- the length of body portion 110 and/or the exterior segment 122 can include an extension E (see Fig. 3) that is in a range of approximately 0.8 in. to 1.5 in. (20 to 38 mm) in order to provide a predetermined overlap at the inlet side 126.
- the slope of the cone portion forms an angle a with the axis FI (see Fig. 1) that is in a range of 5 degrees to 15 degrees.
- the angle a can be 8 degrees to 12 degrees, and more preferably 10 degrees ⁇ 1 degree.
- the distal end 127 of the exterior segment 122 can have a diameter D3 in a range of 13 in. (330 mm) to 26 in. (660 mm).
- the diameter D3 can be in a range of 14 in. (356 mm) to 16 in. (406 mm), and even more preferably 15 in. ⁇ 0.1 in. (381 mm ⁇ 2.5 mm).
- the diameter D3 can be in a range of 22.5 in.
- the base 128 of the interior segment 124 can have a diameter that is approximately the same as the diameter at the distal end 127 of the main segment 122.
- the diameter D4 at the base 128 can be in a range of 13 in. (330 mm) to 26. in (660 mm).
- the diameter D4 can be in a range of 14 in. (356 mm) to 16 in. (406 mm), and even more preferably 15 in. ⁇ 0.1 in. (381 mm ⁇ 2.5 mm).
- the diameter D4 can be in a range of 22.5 in. (572 mm) to 24.5 in. (622 mm), and even more preferably 23.5 in (597 mm ⁇ 2.5 mm).
- the length L4 of the interior segment 124 along the axis FI is in a range of 19.5 in. (495 mm) to 33.5 (851 mm).
- the length L4 can be in a range of 20.5 in. (521 mm) to 22.5 in. (572 mm), and more preferably 21.25 ⁇ 0.1 in. (540 mm ⁇ 2.5 mm). In other embodiments, the length L4 can be in a range of 30.5 in. (775 mm) to 32.5 in. (826 mm), and more preferably 31.5 in. ⁇ .1 in (800 mm ⁇ 2.5 mm). In some embodiments, when the interior segment 124 has a cone shape or a frustum cone shape, the slope of the cone portion forms an angle b with the axis FI that is in a range of 12 degrees to 20 degrees.
- the angle b can be in a range of 15 degrees to 19 degrees, and more preferably 17 degrees ⁇ 0.5 degree.
- the distal end 129 of the interior segment 124 (e.g., the apex of the frustum cone shape of the interior segment 124) can have a diameter D5 in a range of 1 in. (25 mm) to 6 in. (152 mm).
- the diameter D5 can be in a range of 1.5 in. (38 mm) to 2.5 in. (63.5 mm), and more preferably 2.0 in. ⁇ 0.1 in. (51 mm ⁇ 2.5 mm).
- the diameter D5 can be in a range of 3 in. (76 mm) to 5 in. (127 mm), and more preferably 4 in. (102 mm ⁇ 2.5 mm).
- the interior 125 of the foam generator portion 120 includes a surface (e.g., surface 122a of exterior segment 122 and/or surface 124a of interior segment 124) that facilitates the generation of the foam.
- a surface e.g., surface 122a of exterior segment 122 and/or surface 124a of interior segment 124.
- the surface 122a and/or the surface 124a of the foam generator portion 120 can have a plurality of openings that go through the wall(s) of the foam generator portion 120.
- the walls(s) of the foam generator portion 120 can be constructed from a perforated sheet, a mesh screen, and/or some other material with a plurality of holes (e.g., metal wires, or similar structures, in a web-like pattern with evenly spaced openings) having a mesh size of about 1/8 in. (3.2 mm).
- the foam solution from the body portion 110 preferably impinges on the surface 122a and/or surface 124a at a velocity that will cause the foam solution to become a foam.
- an expansion ratio of the HEF generator 10 can be in a range of 400 to 1100, preferably in a range of 400 to 1000, more preferably in a range of 400 to 900, and even more preferably in a range of 400 to 800.
- all or a portion of the foam generator portion 120 can be made of sheet metal (e.g., a perforated sheet metal) that has a standard thickness for the material such as, for example, 1/32 in. (0.8 mm).
- the sheet metal can be stainless steel and/or another appropriate metal.
- the foam generator portion 120 is not limited to a metal construction and other materials can be used (e.g., composites, plastics, ceramics, and/or another appropriate material.
- Figures 4 and 5 are a perspective view and a front cross-sectional view of the nozzle manifold 220, respectively.
- Figures 6 and 6A are a side cross-sectional view of the nozzle manifold 220 and an expanded view of the interface between the nozzle manifold 220 and a nozzle 250, respectively.
- the nozzle manifold 220 can preferably include one or more nozzle headers that are each configured to distribute foam solution through one or more nozzles 250.
- the nozzle manifold 220 is preferably configured to evenly distribute the volumetric flow (also referred to herein as "flow") of the foam solution through the nozzles 250.
- the nozzle manifold 220 can have one or more main headers that receive the foam solution.
- main header means a header receiving foam solution from an external supply.
- exemplary embodiments can include a main header 224 that receives the foam solution at the inlet 226 from, for example, foam proportioning system 25.
- each of the main headers can include one or more sub-headers that are fluidly connected to the respective main header.
- sub-header means a header receiving foam solution from a main header.
- sub-headers 230a, b can be fluidly connected to the main header 224 such that the foam solution in the main header 224 flows to the sub-headers 230a, b.
- the main header 224 and/or the sub-headers 230a, b have a substantially linear configuration such as, for example, a linear tube-shaped configuration.
- the main header 224 can have a linear tube-shaped configuration with an inlet 226 and a closed end 228 disposed opposite the inlet 226.
- the tube-shaped configuration for the main header 224 is preferably a cylindrical configuration, but other configurations are possible such as rectangular (e.g., square), triangular and/or another polygonal shape.
- one or both of the sub-headers 230a, b preferably have a linear tube-shaped configuration.
- the tube-shaped configuration for the sub-headers 230a, b is preferably a cylindrical configuration, but other configurations are possible such as rectangular (e.g., square), triangular and/or another polygonal shape.
- the main header 224 and the respective sub-headers 230a, b are disposed crosswise to each other such as, for example, orthogonal to each other.
- the sub-headers 230a, b are disposed colinear to each other and orthogonal to the main header 230a, b is fluidly connected to the main header 224 and the outer end 232a, b of the respective sub-headers 230a, b is closed.
- the foam solution enters the nozzle manifold 220 at the inlet 226 of the main header 224 and then enters the sub-headers 230a, b via inlets 231a and 231b of the respective sub-headers 230a, and 230b.
- the linear configuration with the closed end 228 of the main header 224 and the linear configuration with the closed ends 232a, b of the respective sub-headers 230a, b serve to minimize flow disturbances as foam solution is sprayed from the nozzles 250.
- some prior art nozzle manifolds can have headers (and/or portions of headers) that are circular or ring-shaped, which produce curvilinear flows through at least a portion of the manifold while foam solution is sprayed from the nozzles. It is believed that such curved header configurations (especially ring- shaped headers having no "closed ends”) may create pressure variances in the header that lower the efficiency of the nozzles in comparison to the linear header configurations in some embodiments of the present disclosure.
- the nozzle header manifold can have other types of linear configurations such as, for example, an "H" shaped header in which the horizontal portion is a main header and the vertical portions are sub-headers or any other combination of main and sub-headers.
- Some embodiments of the present disclosure are not limited to linear headers and can have curvilinear headers (including ring-shaped headers) and/or headers having other shapes.
- the inside diameter D9 of the main header 224 and/or the inside diameter D10 of one or both of the sub-headers 230a, b is in a range of 1 in.
- the diameter D9 of the main header 224 can be 2.5 in. ⁇ 0.1 in. (64 mm ⁇ 2.5 mm), and in other embodiments, the diameter D9 can be 3.0 in. ⁇ 0.1 in. (76 mm ⁇ 2.5 mm).
- the diameter DIO of one or both of the sub-headers 230a, b can be 2.0 in. ⁇ 0.1 in. (51 mm ⁇ 2.5 mm), and in other embodiments, the diameter D10 can be 2.5 in. ⁇ 0.1 in. (64 mm ⁇ 2.5 mm).
- main header 224 and/or the sub-headers 230a, b conform to known pipe standards such as, for example, British standard pipe (BSP), national pipe thread taper (NPT), and/or some other pipe standard.
- BSP British standard pipe
- NPT national pipe thread taper
- the main header 224 and/or one or both of the sub-headers 230a, b can be made of carbon steel, stainless steel, and/or some other appropriate material.
- the nozzle manifold 220 is preferably configured to have one or more nozzle housings, such as, for example, nozzle housings 234, that are each configured to accept a nozzle 250.
- the nozzle 250 can be fixedly attached (e.g., by soldering, welding, bonding) or detachably attached (e.g., by screwing the nozzle into the nozzle housing).
- the nozzle housing 234 and the nozzle 250 can be configured with corresponding thread patterns (e.g., patterns that meet BSP and NPT standards) as shown by interface 236 in Figure 6A so that the nozzle 250 can be threaded into the nozzle housing 234.
- Each main header 224 and/or each sub-header 230 can include one or more nozzle housings 234.
- the nozzle housings 234 are distributed between the main header 224 and the sub header 230 such that the jet sprays from the nozzles 250 are symmetrically distributed across the inlet 112 of the foam generator assembly 100.
- four nozzle housings 234 are arranged to spray foam solution into the inlet 112 of the foam generator assembly 100 in a symmetrical 90-degree pattern around the flow axis FI .
- other symmetrical patterns and/or non-symmetrical patterns can be used based on the shape of the foam generator assembly 100, the number of nozzles, and the desired flow pattern.
- a length L5 corresponding to a distance from the centerline of the main header 224 (shown in Figure 6) and/or the sub-header 230 (not shown but similar) and the outlet end of the nozzle housing 234 is in a range of 2.25 in. (57 mm) to 7 in. (178 mm).
- the length L5 can be in a range of 2.5 in. (64 mm) to 3.25 in. (83 mm), and more preferably, 2.75 in. ⁇ 0.1 in. (70 ⁇ 2.5 mm).
- the length L5 can be in a range of 3.25 in. (83 mm) to 4.0 in. (102 mm), and more preferably, 3.75 in.
- the length L5 can be 5.5 in. (140 mm) to 6.5 in. (165 mm), and more preferably, 6.1 in. ⁇ 0.1 in (155 ⁇ 2.5 mm).
- a length L6 corresponding to a distance from the inner wall surface of the main header 224 (shown in Figure 6 A) and/or the sub-header 230 (not shown but similar) to the inlet of the nozzle 250 when attached to the nozzle housing 234 is in a range of 1.45 in. (37 mm) to 4.5 in. (114 mm).
- the length L6 can be in a range of 3.5 in. (89 mm) to 4.5 in.
- the configuration of the nozzle housing 234, which can include the length L6, is such that the foam solution is believed to enter a laminar flow region or state prior to entering the nozzle 250.
- Figure 7 is a front cross-sectional view of the nozzle 250 and insert 260.
- Figure 8 is a front cross-sectional view of the nozzle 250, with the insert 260 removed.
- the nozzle 250 is a device that controls the direction, and characteristics (e.g., flow characteristics such as velocity, flow, spray pattern, or some other characteristic) of the foam solution flow as the foam solution exits the nozzle manifold 220.
- the nozzle 250 includes a main body 255 and a conical nozzle tip 257.
- an exterior of the nozzle 250 includes threads 259 that allow the nozzle 250 to be attached to the nozzle housing 234 on the nozzle manifold 220.
- the nozzle 250 can have an inlet 248 that receives the foam solution from the nozzle manifold 220 and an outlet 258 through which the foam solution is sprayed into the foam generator assembly 100.
- the diameter D6 of inlet 248 of the nozzle 250 is in a range from 0.5 in. (13 mm) to 1.5 in. (38 mm), and more preferably 0.75 in. (19 mm) to 1.25 in. (32 mm).
- the diameter D6 can be 0.75 in. ⁇ 0.1 in. (19 mm ⁇ 2.5 mm) and in other embodiments, the diameter D6 can be 1.25 in. ⁇ 0.1 in. (32 mm ⁇ 2.5 mm).
- a ratio of D6 to L6 (also referred to herein as "nozzle housing ratio”) is 0.8 or less.
- the nozzle housing ratio can be in a range of 0.25 to 0.80, more preferably in a range of 0.28 to 0.35 and even more preferably a ratio of 0.32 ⁇ 0.01.
- the diameter D8 of the outlet 258 of the nozzle 250 is in a range from 0.10 in. (2.5 mm) to 0.5 in. (13 mm), and more preferably 0.12 in. (3 mm) to 0.4 in. (10 mm).
- the diameter D8 can be 0.15 in. ⁇ 0.01 in. (3.8 mm ⁇ .25 mm) and in other embodiments, the diameter D8 can be 0.375 in. ⁇ 0.01 in. (9.5 mm ⁇ .25 mm).
- the nozzle 250 can include one or more internal chambers.
- the nozzle 250 can include a main chamber
- the main chamber 251 that extends from the inlet 248 and preferably has the same diameter as the inlet 248.
- the main chamber 251 is configured to receive an insert (discussed below) and/or can be the largest chamber of the nozzle 250.
- a reduction chamber 254 is disposed downstream of the main chamber 251.
- the reduction chamber 254 is configured to funnel the foam solution exiting the main chamber 251 and direct the flow to the outlet 258.
- the angle 01 between an inner surface of the reduction chamber 254 and a base of the nozzle 250 is in a range of 40 degrees to 50 degrees, and preferably 45 degrees ⁇ 1 degree.
- the diameter D7 at the inlet of the reduction chamber 254 can be the same as or less than the diameter D6 of the main chamber 251.
- the diameter D7 is less than the diameter D6 of the main chamber 251 and can be in a range of 0.650 in. (16.5 mm) to 0.750 in. (19 mm), and more preferably 0.680 in. ⁇ 0.01 in. (17.3 mm ⁇ 2.5 mm).
- the diameter D7 can be in a range of 1.0 in. (25 mm) to 1.22 in. (31 mm), and more preferably 1.18 in. ⁇ 0.01 in. (30 mm ⁇ 0.25 mm).
- the flow from the reduction chamber 254 is directed to the outlet 258 via an exit channel 256 disposed in the nozzle tip 257.
- the exit channel 256 can have a length L7 that is in a range of 0.5 in. (12.7 mm) to 1 in. (25 mm). In some embodiments, the length L7 can be 0.6 in. ⁇ 0.1 in. (15.2 mm
- the length L7 can be 0.75 in. ⁇ 0.1 in. (19 mm ⁇ 2.5 mm).
- a diameter of the exit channel 256 is the same as the diameter of the outlet 258.
- the nozzle 250 can include an intermediate chamber 252 disposed between the main chamber 251 and the reduction chamber 254. Prior to getting funneled by the reduction chamber 254, the intermediate chamber 252 can provide a transition region for the foam solution as the foam solution exits the insert 260 of the main chamber 251.
- a diameter of the intermediate chamber 252 is the same as the diameter D7 of the inlet of the reduction chamber 254.
- the interface between the main chamber 251 and the intermediate chamber 252 can include a land area 253 that is preferably formed by a difference in the diameter D6 of the main chamber 251 and the diameter D7 of the intermediate chamber 252.
- the land area 253 aligns and/or provides a backstop for the nozzle insert 260 (discussed below).
- a length L8 of the intermediate chamber 252 is in a range of 0.06 in. (1.5 mm) to 0.10 in. (2.5 mm), and more preferably 0.08 in. ⁇ 0.01 in.
- the tip 257 of nozzle 250 is cone shaped.
- the surface of tip 257 forms an angle 02 with respect to a base of the nozzle 250 that is in a range of 30 degrees to 60 degrees, and more preferably 40 degrees to 50 degrees, and even more preferably 45 degrees ⁇ 1 degree. It is believed that the cone-shaped tip 257 aids the jet spray from each nozzle in drawing in the surrounding air.
- the nozzles 250 of the present disclosure are more efficient with respect to aspirating the air into the HEF generator 10.
- Figures 9 and 10 are perspective and side views, respectively, of the nozzle insert 260.
- the nozzle insert 260 is configured to fit into the main chamber 251.
- the nozzle insert 260 is positioned in the main chamber so as to make contact with the land 253.
- a diameter of the nozzle insert 260 is approximately the same as the inner diameter of the main chamber 251.
- the nozzle insert 260 is attached to the nozzle 250 by known means such as, for example, a press fit, solder, bonding, or other means to attach (e.g., fixedly or removably) the insert 260 to the nozzle 250.
- the nozzle insert 260 can have a configuration in which one or more twisting flow paths are created in order to enhance the exit velocity of the foam solution jet spray.
- the nozzle insert 260 can include a swirl-type insert to create a swirl pattern on the foam solution jet spray that is exiting the nozzle 250.
- all of the foam solution flowing through the nozzle 250 follows one or more curvilinear flow paths.
- the nozzle insert 260 can have a multi-swirl vane configuration which splits the foam solution flow path into two or more curvilinear paths through the nozzle 250. In some prior art inserts, only a portion of the flow solution may follow a curvilinear path.
- the nozzle insert 260 includes a dual swirl vane configuration with a flow divider 262 and swirl vanes 266 and 276.
- the nozzle insert 260 can be a single integrated unit or assembled from separate parts.
- one or more of the swirl vane 266, the swirl vane 276, and/or the divider 262 can be a separate part that is attached (e.g., by soldering or other known means) to the insert assembly.
- the swirl vanes 266 and 276 are angled and twisted with respect to a base of the nozzle 250 so as to provide a swirling motion as the foam solution flows through the nozzle 250.
- the twist of each swirl vane 266, 276 extends approximate 180 degrees around the main chamber 251.
- the twist of the swirl vanes can extend more than 180 degrees or less than 180 degrees.
- the slopes of the swirl vanes 266 and 276 are preferably opposite to each other so as to form an "X" shape when viewed from the side (e.g., see Figure 10).
- the slope of each swirl vane 266, 276 forms an angle 03 that is in a range of 30 degrees to 50 degrees and, more preferably, 35 degrees to 45 degrees with respect to a base of the divider 262.
- the base of the divider 262 is perpendicular to the side walls of the main chamber.
- the angle 03 can be 35 degrees ⁇ 0.5 degree and, in some embodiments, the angle 03 can be 40 degrees ⁇ 0.5 degree.
- the flow divider 262 splits the inlet flow into two streams (e.g., a first stream SI and a second stream S2).
- the first stream SI flows up through the insert 260, the first stream SI is bounded by the upstream surface 276b of vane 276 (see Figure 9), a side of the flow divider 262, and the wall of the main chamber 251.
- the first stream SI continues on its path, the first stream S 1 crosses over to the downstream surface 266a of vane 266 via crossover path 261a.
- the second stream S2 flows up through the insert 260, the second stream is bounded by the upstream surface 266b of vane 266, the other side of the flow divider 262, and the wall of the main chamber 251. As the second stream S2 continues on its path, the second stream S2 crosses over to the downstream surface 276a of vane 276 via crossover path 261b (see Figure 9). As the first and second streams SI, S2 of the foam solution combine and exit the main chamber 251 on the downstream sides 266a and 276a, a swirl pattern is created on the foam solution flow.
- one or both of the downstream surfaces 266a, 276a of swirl vanes 266 and 277, respectively, are substantially planar so as to provide a solid surface for the foam solution flow.
- Solid surface means that the surfaces 266a, 276a do not have breaks, slots, gaps, holes, protrusions, indents, an aperture that allows a lineal flow path to be formed from the nozzle inlet to the nozzle outlet, and/or other features that can disturb the curvilinear flow path to a significant degree.
- the interface between the flow divider 262 and/or the swirl vanes 266, 276 can be configured to provide a non-sharp transition at the crossover path (261b, 261a) for one or both flow streams as the respective stream transitions from the upstream side (266b, 276b) to the downstream side (276a, 266a).
- "Non-sharp transition” as used herein means a transition interface between two surfaces is not at a 90-degree angle.
- a non-sharp transition feature such as, for example, a chamfered edge, a rounded edge, and/or some other feature that provides a smooth transition can be included at the interface between the divider 262 and the respective swirl vane 266, 276.
- the crossover path 261a, 261b is preferably defined by the non-sharp transition feature to aid in smoothly transitioning (e.g., without excessive flow disturbances) the flow from the upstream side to the downstream side.
- the crossover path 261a of the insert 260 is defined by a chamfered edge 264 (e.g., at an angle of 45 deg.) between a side of the divider 262 and swirl vane 266.
- a similar chamfered edge between the other side of divider 262 swirl vane 276 can be provided to define crossover path 261b (not shown).
- one or both swirl vanes 266, 276 can be configured to provide a smooth transition for the foam solution flow as the foam solution exits the main chamber 251.
- one or both of the swirl vanes 266, 276 can have a transition feature such as, for example, a chamfered edge 268, 278, respectively, at the discharge end of the swirl vane 266, 276.
- the chamfered edge 268, 278 provides a flat surface for the nozzle insert 260 to seal against the land 253 of the nozzle body 255.
- the chamfered edge 268, 278 can aid in smoothly transitioning (e.g., without excessive flow disturbances) the foam solution flow from the main chamber 251 and into the reduction chamber 254.
- the velocity of the foam solution at the outlet 258 of nozzle can be in a range of 248 in/min (630 cm/min) to 432 in/min (1007 cm/min) and the flow rate from each nozzle can be in a range of 16.5 gpm (62.5 lpm) to 30 gpm (113.61pm).
- the nozzle 250 includes a nozzle insert 260 that is configured to achieve desired flow characteristics for the foam solution as the foam solution impinges on the surface 122a and 124a of the foam generator portion 120.
- the insert 260 can provide a flow pattern, velocity, and/or flow rate that achieves a desired foam expansion ratio.
- Exemplary embodiments of the nozzle 250 and/or the nozzle insert 260 described herein are not limited to aspirated-type foam generators and can be used in other applications such as, for example, other types of foam generators.
- the nozzles 250 can have a K- factor in a range 0.4 to 3.2 GPM/(psi) 1 ⁇ 2 .
- the HEF generator 10 can include nozzles 250 having a K-factor in a range of 0.5 to 0.6 GPM/(psi) 1 ⁇ 2 .
- exemplary embodiments of the HEF generator 10 with nozzles in a range of 0.5 to 0.6 GPM/(psi) 1 ⁇ 2 K-factor can meet or exceed the expansion ratios of related art foam generators with nozzles in a range of 1.25 to 1.35 GPM/(psi) 1 ⁇ 2 .
- some exemplary embodiments of the HEF generator 10 can meet the performance of related art HEF foam generators while using less foam solution.
- nozzles having a preferred K-factor and/or preferred nozzle inserts can be used to reduce the number of nozzles in a foam generator while still maintaining predetermined foam expansion ratios.
- the HEF generator 120 can include nozzles 250 that have K-Factors in a range of 2.85 to 2.95 GPM/(psi) 1 ⁇ 2 .
- the nozzles can have K-factors in the range of 1.25 to 1.35 GPM/(psi) 1 ⁇ 2 , which means that 6 to 9 nozzles are needed for these known commercial foam generators to generate foam in a range of 7800 to 11,200 CFM at approximately 101 psi (7 bar).
- the HEF generator 10 can have less than 6 nozzles, and more preferably 4 nozzles or less, and even more preferably 3 nozzles or less.
- the HEF generator 10 can generate foam at a flow rate of about 10,000 CFM or more, and more preferably, 12,000 CFM or more, at about 101 psi, using less than 6 nozzles.
- the foam flow rate is about 9,970 CFM for an inlet pressure of 72 psi (5 bar) and about 12, 574 CFM for an inlet pressure of 101 psi (7 bar).
- two or more HEF generators 10 can be attached to provide a generator system that provides a predetermined CFM that is greater than 12,500 CFM.
- two HEF generators 10 that can each generate 12,500 CFM or more can be aligned and/or connected to each other to form a paired twin HEF generator unit that functions as a single HEF generator.
- the paired twin HEF generator unit can generate 25,000 CFM or more.
- a HEF generator unit capable of producing 25,000 CFM or more uses a forced-air type HEF generator having fans.
- the paired twin HEF generator unit of the present disclosure which generates foam at 25,000 CFM or more, does not use fans and thus is easier to install.
- Embodiments of the present disclosure are not limited to HEF generators that generate 10,000 CFM or more, and, in some embodiments, the HEF generator 10 can generate less than 10,000 CFM.
- the high-efficiency nozzles allow the HEF generator 10 to have a larger inlet pressure range than related art aspirated-type foam generators.
- the HEF generator 10 can generate a foam expansion ratio of 400 or more for a nozzle inlet pressure (e.g., pressure in the nozzle manifold 220) at 40 psi (2.76 bar) or less, more preferably 29 psi (2.0 bar) or less, and even more preferably 21.8 psi (1.5 bar) or less.
- the HEF generator 10 can generate a foam expansion ratio in a range of 800 to 1100, and more preferably 800 to 1000, for an inlet pressure of 116 psi (8 bar) or less, and more preferably 101 psi (7 bar) or less.
- the HEF generator 10 is configured to operate at a nozzle inlet pressure (e.g., pressure in the nozzle manifold 220) that is in range of 21.8 psi (1.5 bar) to 116 psi (8 bar), and more preferably 29 psi (2 bar) to 101 psi (7 bar) while keeping the foam expansion ratio within a predetermined range.
- the predetermined foam expansion ratio can be a ratio based on the foam solution concentrate being used.
- the predetermined expansion ratio can be in a range of 400 to 1100, preferably in a range of 400 to 1000, more preferably in a range of 400 to 900, and even more preferably in a range of 400 to 800.
- the HEF generator 10 can generate foam at a volumetric foam flow rate of 1200 CFM or greater for inlet pressures that are 50 psi (3.44 bar) or less and more preferably 46 psi (3.17 bar) or less.
- the HEF generator 10 can generate foam at a volumetric foam flow rate of 2000 CFM or greater for inlet pressures that are 75 psi (5.17 bar) or less, more preferably 40 psi (2.76 bar) or less, and even more preferably 29 psi (2 bar) or less. In some embodiments, the HEF generator 10 can generate foam at a volumetric foam flow rate of 2900 CFM or greater for inlet pressures that are 103 psi (7.1 bar) or less. In some embodiments, the HEF generator 10 can generate foam at a volumetric foam flow rate of 4000 CFM or greater for inlet pressures that are 40 psi (2.76 bar) or less and more preferably 29 psi (2 bar) or less.
- the HEF generator 10 can generate foam at a volumetric foam flow rate of 9000 CFM or greater for inlet pressures that are 72.5 psi (5 bar) or less. In some embodiments, the HEF generator 10 can generate foam at a volumetric foam flow rate of 10,000 CFM or greater for an inlet pressure that is 101 psi (7 bar) or less. In some embodiments, the HEF generator 10 can generate foam at a volumetric foam flow rate of 12,500 CFM or greater for an inlet pressure that is 101 psi (7 bar) or less.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US202063009812P | 2020-04-14 | 2020-04-14 | |
PCT/US2021/027094 WO2021211592A1 (en) | 2020-04-14 | 2021-04-13 | High-expansion foam generator having a nozzle with a solid nozzle insert with a non-sharp cross-over path |
Publications (1)
Publication Number | Publication Date |
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EP4135858A1 true EP4135858A1 (en) | 2023-02-22 |
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Application Number | Title | Priority Date | Filing Date |
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EP21723535.7A Pending EP4135858A1 (en) | 2020-04-14 | 2021-04-13 | High-expansion foam generator having a nozzle with a solid nozzle insert with a non-sharp cross-over path |
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WO (1) | WO2021211592A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US2597913A (en) * | 1947-09-12 | 1952-05-27 | Joshua B Webster | Fire foam nozzle |
KR101367487B1 (en) | 2006-11-30 | 2014-02-25 | 노미 보사이 가부시키가이샤 | High expansion foam firefighting equipment |
KR100917277B1 (en) | 2009-01-08 | 2009-09-16 | (주) 엔케이텍 | Foam generator for a ship |
KR101309186B1 (en) * | 2011-09-20 | 2013-09-23 | 주식회사 엔케이 | Foam generator for a ship |
CN103550890A (en) * | 2013-11-08 | 2014-02-05 | 西安新竹防灾救生设备有限公司 | Gun for generating medium expansion foams |
-
2021
- 2021-04-13 EP EP21723535.7A patent/EP4135858A1/en active Pending
- 2021-04-13 WO PCT/US2021/027094 patent/WO2021211592A1/en unknown
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