Compressed air foam mixer and ejection device

Abstract

The invention provides a compressed air foam mixer and ejection equipment, the compressed air foam mixer is used for mixing compressed air and foam mixed liquid, the compressed air foam mixer comprises at least one shell, and the shell is provided with at least one through mixing space; each blade is mounted in the corresponding mixing space, and compressed air and foam mixed liquid enters the mixing spaces to push the blades to rotate so as to be mixed into compressed air foam.

Description

Technical Field

[0001] This invention relates to the field of compressed air foam systems, and more specifically to a compressed air foam mixer and a spraying device. Background Technology

[0002] Compressed air foam systems currently typically use a direct injection method, where compressed air is directly injected into the foam mixture. Because the pressure of compressed air is higher than that of the foam mixture, this method results in compressed air foam with a low expansion ratio, larger bubble size, relatively low viscosity, and poor coverage.

[0003] Another mixing method uses a static mixer, which achieves gas-liquid mixing through sudden contraction (or gradual contraction) and expansion (or gradual expansion) of the flow channel, or through spiral changes in the flow channel. Compared to direct injection, this method offers better mixing, higher foaming ratio, smaller bubble size, higher viscosity, and better coverage. However, this static mixer method requires relatively more sudden contraction (or gradual contraction) and expansion (or gradual expansion), or a longer spiral flow channel; otherwise, it will not achieve a good mixing effect.

[0004] Traditional direct injection mixing and static mixer methods are typically used in centralized mixing systems. This means that gas and liquid are mixed first, and then transported. In this way, the pipeline transports a gas-liquid mixture. This method of transport has high resistance loss, and when the transport distance is long, the compressed air foam ejected from each end (such as nozzle) varies greatly. Summary of the Invention

[0005] The present invention provides a compressed air foam mixer and a spraying device. The compressed air foam mixer adopts a dynamic mixing form, which makes the compressed air and foam mix more evenly.

[0006] This invention provides a compressed air foam mixer and a spraying device. The compressed air foam mixer is installed at the end of the spraying device to achieve end mixing. Before mixing, the compressed gas and foam liquid are separately delivered to the compressed air foam mixer and then mixed to form a gas-liquid mixture. The method of separately delivering gas and liquid reduces resistance loss, so that the compressed air foam sprayed by the spraying device is basically uniform.

[0007] This invention provides a compressed air foam mixer and a spraying device. After compressed air and foam mixture are transported to the end of the compressed air foam mixture, the blades are rotated by the power of the gas-liquid mixture. The rotation of the blades makes the gas-liquid mixture more uniform. Compared with static mixing, the resulting compressed air foam is finer, foams more fully, has a higher foaming ratio, higher viscosity, and better coverage.

[0008] This invention provides a compressed air foam mixer and a spraying device. The spraying device can be a nozzle, foam generator, fire gun, fire monitor, etc. The compressed air foam sprayed by the spraying device is basically uniform.

[0009] According to one aspect of the present invention, a compressed air foam mixer is provided for mixing compressed air and a foam mixture, comprising:

[0010] At least one housing, the housing being provided with at least one through-hole mixing space; and

[0011] At least one blade, each blade being installed in each of the mixing spaces, wherein compressed air and foam mixture enter the mixing space to drive the blade to rotate so as to be mixed into compressed air foam.

[0012] According to some examples of the present invention, the blade includes an integrally formed first blade portion, a curved portion and a second blade portion connected in sequence, wherein the first blade portion and the second blade portion are symmetrically distributed on both sides of the curved portion about the rotation axis of the blade.

[0013] According to some examples of the invention, the curved portion includes a first curved portion and a second curved portion that are rotationally symmetrical about the axis of rotation, the first curved portion and the second curved portion having opposite bending directions.

[0014] According to some examples of the invention, the blade is an axial flow blade or a mixed flow blade.

[0015] According to some examples of the invention, the compressed air foam mixer includes one or more layers of structure, and when it has two or more layers of structure, at least two of the housings are stacked to mount at least two layers of the blades.

[0016] According to some examples of the present invention, the housing includes a bottom wall and a top wall, the mixing space extends through the housing, an inlet is formed in the bottom wall, and an outlet is formed in the top wall, wherein an inlet limiting portion is provided on one side of the inlet, and an outlet limiting portion is provided on one side of the outlet, to respectively limit the rotation angle of the blade in the direction of the inlet and the direction of the outlet.

[0017] According to some examples of the invention, the compressed air foam mixer further includes a cover located on the outlet side of the housing.

[0018] According to some examples of the present invention, the cover is provided with a plurality of cover outlets, the cover outlets being located on the outlet side of the housing, and the inner diameter of the cover outlets being smaller than the inner diameter of the outlet, such that a portion of the edge of the cover defining the cover outlets forms the outlet limiting portion.

[0019] According to some examples of the present invention, the cover and the shell are formed separately, or the cover and the shell are formed integrally.

[0020] According to another aspect of the present invention, the present invention also provides a spraying device for spraying mixed compressed air foam, comprising:

[0021] Compressed air foam mixer; and,

[0022] It also has a nozzle, and the compressed air foam mixer is disposed inside the nozzle, located at the end of the ejection device, wherein compressed air and the foam mixer are delivered separately and mixed by the compressed air foam mixer after reaching the compressed air foam mixer to generate compressed air foam for ejection through the nozzle.

[0023] According to some examples of the present invention, the spraying device may be a foam generator, a foam mixer, a nozzle, a foam gun, a fire monitor, etc. Attached Figure Description

[0024] Figure 1 This is a perspective view of a compressed air foam mixer according to a preferred embodiment of the present invention.

[0025] Figure 2 This is a perspective view of the blades of a compressed air foam mixer according to a preferred embodiment of the present invention.

[0026] Figure 3 This is a side view schematic diagram of the blades of a compressed air foam mixer according to a preferred embodiment of the present invention.

[0027] Figure 4 This is a cross-sectional schematic diagram of a compressed air foam mixer according to a preferred embodiment of the present invention.

[0028] Figure 5 This is a perspective view of a compressed air foam mixer with a double-blade structure according to another preferred embodiment of the present invention.

[0029] Figure 6 This is a perspective view of a spraying device implemented as a foam generator according to another preferred embodiment of the present invention.

[0030] Figure 7A The diagram shows a cross-sectional view and a partially enlarged view of a spraying device according to another preferred embodiment of the present invention, which is implemented as a foam generator with a double-layer blade structure.

[0031] Figure 7BThe diagram shows a cross-sectional view and a partially enlarged view of a spraying device according to another preferred embodiment of the present invention, which is implemented as a foam generator with a single-layer blade structure.

[0032] Figure 8 This is a schematic diagram of a spraying device according to another preferred embodiment of the invention, implemented as a foam mixer with a single layer of blades.

[0033] Figure 9A This is an exploded schematic diagram of an ejection device implemented as a foam mixer with a single layer of blades according to another preferred embodiment of the present invention.

[0034] Figure 9B This is a cross-sectional schematic diagram of a spraying device according to another preferred embodiment of the present invention, implemented as a foam mixer with a single layer of blades.

[0035] Figure 10A This is a perspective view of a spraying device according to another preferred embodiment of the invention, implemented as a foam mixer with at least two layers of blades.

[0036] Figure 10B This is a cross-sectional schematic diagram of a spraying device according to another preferred embodiment of the invention, implemented as a foam mixer with at least two layers of blades.

[0037] Figure 11 This is a perspective view of a compressed air foam mixer according to another preferred embodiment of the present invention.

[0038] Figure 12 This is a cross-sectional schematic diagram of a compressed air foam mixer according to another preferred embodiment of the present invention.

[0039] Figure 13 This is a schematic diagram of a spraying device implemented as a closed nozzle according to another preferred embodiment of the present invention.

[0040] Figure 14 This is an exploded schematic diagram of a spraying device implemented as a closed nozzle according to another preferred embodiment of the present invention.

[0041] Figure 15 This is a cross-sectional schematic diagram of a spraying device according to another preferred embodiment of the present invention, which is implemented as a closed nozzle with a single-layer blade structure.

[0042] Figure 16 This is a cross-sectional schematic diagram of a spraying device according to another preferred embodiment of the present invention, which is implemented as a closed nozzle with a double-layer blade structure.

[0043] Figure 17This is a schematic diagram of an ejection device implemented as an open nozzle according to another preferred embodiment of the present invention.

[0044] Figure 18 This is an exploded schematic diagram of an ejection device implemented as an open nozzle according to another preferred embodiment of the present invention.

[0045] Figure 19A This is a cross-sectional schematic diagram of a spraying device according to another preferred embodiment of the present invention, implemented as an open nozzle with a single-layer blade structure.

[0046] Figure 19B This is a cross-sectional schematic diagram of a spraying device according to another preferred embodiment of the present invention, implemented as an open nozzle with a double-layer blade structure.

[0047] Figure 20A and Figure 20B This is a schematic diagram and cross-sectional view of another embodiment of the ejection device according to another preferred embodiment of the present invention, which is implemented as an open nozzle.

[0048] Figure 20C and Figure 20D This is a schematic diagram and cross-sectional view of another embodiment of the ejection device according to another preferred embodiment of the present invention, which is implemented as a closed nozzle.

[0049] Figure 21 This is a schematic diagram of a spraying device implemented as a fire sprinkler head according to another preferred embodiment of the present invention.

[0050] Figure 22 This is an explosion diagram of a spraying device implemented as a fire sprinkler head according to another preferred embodiment of the present invention.

[0051] Figure 23 This is a cross-sectional schematic diagram of a spraying device according to another preferred embodiment of the present invention, implemented as a fire sprinkler head, having a single-layer blade structure.

[0052] Figure 24 This is a cross-sectional schematic diagram of a spraying device according to another preferred embodiment of the present invention, implemented as a fire sprinkler head with a double-layer blade structure. Detailed Implementation

[0053] The terms and words used in the following description are not limited to their literal meanings, but are used solely by the inventors to enable a clear and consistent understanding of the invention. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the invention is provided for illustrative purposes only and not for limiting the invention as defined by the appended claims and their equivalents.

[0054] While ordinal numbers such as "first," "second," etc., will be used to describe various components, there is no limitation on which components are used herein. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the teachings of the inventive concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0055] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will also be understood that the terms "comprising" and / or "having" specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof when used in this specification, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0056] This invention provides a compressed air foam mixer 100 and an ejection device 200 using the compressed air foam mixer 100. Compressed air and foam mixture are mixed by the compressed air foam mixer 100 and then ejected by the ejection device 200. The compressed air foam mixer 100 is installed at the end of the ejection device 200, close to the nozzle 2000 of the ejection device 200. The compressed air and foam mixture are delivered separately before reaching the compressed air foam mixer 100, that is, the compressed air and foam mixture are delivered to the compressed air foam mixer 100 through different pipes. The compressed air foam mixer 100 mixes the compressed air and foam mixture, and the compressed air foam is ejected through the nozzle 2000 of the ejection device 200.

[0057] Since the compressed air and foam mixture are separately delivered to the end of the ejection device 200 before being mixed by the compressed air foam mixer 100, the end-mixing method results in less transport loss compared to the traditional method of first mixing the compressed air and foam mixture and then transporting the compressed air foam through pipelines. This makes the compressed air foam ejected by the ejection device 200 basically uniform.

[0058] Specifically, such as Figure 1 As shown, the compressed air foam mixer 100 includes a housing 10 and a plurality of blades 20 mounted within the housing. The housing 10 has at least one mixing space 1000, in which the blades 20 are mounted. Two blades 20 are mounted in each mixing space 1000. The two blades 20 are centrally symmetrical.

[0059] like Figure 2 and Figure 3As shown, the blade 20 includes an integrally formed first blade bending portion 22 and a second blade portion 23, and the first blade portion 21, the bending portion 22 and the second blade portion 23 are connected in sequence.

[0060] The blade 20 rotates about a rotation axis O, which passes through the geometric center of the blade 20. The first blade portion 21 and the second blade portion 23 are located on opposite sides of the curved portion 22, rotationally symmetrical about the rotation axis O.

[0061] The curved portion 22 is rotationally symmetrical about the rotation axis O and includes a first curved portion 221 and a second curved portion 222 extending in two opposite directions, with the first curved portion 221 and the second curved portion 222 bending in opposite directions. The first curved portion 221 is connected to the first blade portion 21, and the second curved portion 222 is connected to the second blade portion 23. The first blade portion 21 and the second blade portion 22 extend obliquely from the first curved portion 221 and the second curved portion 23 in opposite directions, respectively.

[0062] Since the shape of the blade 20 is rotationally symmetrical, its shape remains consistent before and after a 180° rotation. The first blade portion 21 and the second blade portion 23 are essentially the same part. For ease of description, one of the two blade portions is defined as the first blade portion 21 and the other as the second blade portion 22. The two can be interchanged. Similarly, the first curved portion 221 and the second curved portion 23 are also interchangeable.

[0063] The two blades 20 are centrally symmetrically mounted in the mixing space 1000 of the housing 10, as viewed from the side of the compressed air foam mixer 100, as shown. Figure 3 As shown, the two blades 20 are located on the same side of the rotation axis O, with the two blade sections staggered.

[0064] It is understood that, in other embodiments, each of the blades 20 may also be axial or mixed-flow blades. Axial-flow blades allow fluid to flow axially, while mixed-flow blades allow fluid to flow both axially and radially.

[0065] After compressed air and foam mixture are delivered to the compressed air foam mixer, they enter the mixing space 1000. The compressed air and foam mixture drive the blades 20 to rotate. The rotation of the blades 20 mixes the compressed air and foam mixture, generating compressed air foam. The rotation of the blades 20 achieves dynamic mixing, making the gas-liquid mixture more uniform. Compared with static mixing, the generated compressed air foam is finer, foams more fully, has a higher foaming ratio, higher viscosity, and better coverage.

[0066] When the two blades 20 are pushed to rotate, they each rotate around the rotation axis O to mix the compressed air and foam mixture more evenly.

[0067] refer to Figure 1 In one embodiment of the compressed air foam mixer 100 shown, the housing 10 has a plurality of spaced-apart mixing spaces 1000. Two blades 20 are installed in each mixing space 1000. The mixing spaces 1000 extend through the housing 10 to form channels that allow flow from one end to the other. Each mixing space 1000 has an inlet 1001 at one end of the housing 10 for compressed air and foam mixture to enter, and an outlet 1002 at the opposite end of the housing 10 for the mixed compressed air foam to exit.

[0068] The shape of the housing 10 is adapted to the pipes on which the housing 10 is assembled. The housing 10 can be cylindrical, cuboid, or other shapes. The mixing space 1000 of the housing 10 can be evenly distributed within the housing 10, making the compressed air foam generated by the compressed foam mixer 100 more uniform.

[0069] The compressed air foam mixer 100 also includes a cover 30, which covers one end of the housing 10 and is located on the outlet 1002 side of the mixing space 1000.

[0070] Combination Figure 1 and Figure 4 As illustrated, the cover 30 has multiple cover outlets 301, each of which is located on the side of the outlet 1002 of the corresponding mixing space 1000. The inner diameter of each cover outlet 301 is smaller than the inner diameter of the outlet 1002, such that a portion of the edge of the cover 30 defining the opening of the cover 301 protrudes from one side of the outlet 1002, forming an outlet limiting portion 31. The outlet limiting portion 31 surrounds the edge of the cover outlet 301 and is located on one side of the outlet 1002, thus limiting the blade 20 on the outlet 1002 side. The outlet limiting portion 31 limits the rotational movement of the blade 20. After the blade 20 rotates a certain angle, its end abuts against the outlet limiting portion 31, preventing the blade 20 from continuing to rotate.

[0071] The housing 10 includes a bottom wall 11, and an inlet 1001 is formed on the bottom wall 11. The inner diameter of the inlet 1001 is smaller than the inner diameter of the mixing space 1000, that is, the inlet 1001 of the mixing space 1000 is smaller than the inner portion of the mixing space 1000, such that a portion of the edge of the inlet 1001 defined by the bottom wall 11 protrudes from one side of the inner portion of the mixing space 1000, forming an inlet limiting part 12. The inlet limiting part 12 is located to the side of the blade 20, forming a limit in the rotational direction of the blade 20. After the blade 20 rotates a certain angle, its end will abut against the inlet limiting part 12, preventing the blade 20 from continuing to rotate.

[0072] In other words, when the blade 20 rotates, its rotation angles in two directions are limited by the outlet limiting part 31 and the inlet limiting part 13, respectively, so that the rotational motion of the blade 20 is an oscillating motion of rotating a certain angle.

[0073] Figures 1 to 4 An embodiment of the compressed air foam mixer 100 is shown, in which a plurality of the blades 20 are distributed in the same layer. Figure 5 An embodiment of the compressed air foam 100 with a two-row blade arrangement is shown, i.e., the multiple blades 20 are distributed in two layers. Specifically, the compressed air foam 100 includes two housings 10, which are stacked to form a two-layer structure. Each housing 10 is provided with one layer of blades 20, resulting in a two-layer distribution of blades 20. The mixing space 1000 is also distributed in two layers, and the cover 30 is disposed on one of the housings 10. This allows the compressed air and foam mixture to be thoroughly mixed through the rotation of the two layers of blades 20, further improving the uniformity of the compressed air foam. In other examples of the invention, the compressed air foam mixer 100 may have two or more layers of blades, and the invention is not limited to this. In examples with two or more layers, the rotation axis projections of the blades 20 in each layer of the compressed air foam mixer 100 overlap.

[0074] Next, an example of the ejection device in which the compressed air foam mixer is applied according to the present invention will be described, wherein the implementation of the blades used in the compressed air foam mixer is the same as described above, and will not be repeated here.

[0075] Figures 6 to 7BAn example of the compressed air foam mixer 100 being applied to a foam generator is shown, i.e., the ejection device 200 is implemented as a foam generator. Specifically, the ejection device 200 has an outlet 2000, and the compressed air foam mixer 100 is installed inside the outlet 2000 to mix compressed air and foam mixture at the end, reducing delivery losses and improving the uniformity of the ejected compressed air foam. Figure 7A An example of the application of the compressed air foam mixer 100 with a double-layer blade arrangement is shown. The two housings 10 of the compressed air foam mixer 100 are stacked, and the mixing spaces 100 of the upper and lower housings 10 are distributed along a flow path, with at least partial communication between them, allowing for complete communication. The projections of the upper and lower blades 20 at least partially overlap. The inlet limiting portion 12 of the lower housing 10 limits the lower blade 20 on the lower inlet 1001 side, and the inlet limiting portion 12 of the upper housing 10 limits the lower blade 20 on the lower outlet 1002 side. A cover 30 is disposed on the upper housing 10. The inlet limiting portion 12 of the upper housing 10 limits the upper blade 20 on the upper inlet 1001 side, and the outlet limiting portion 31 limits the upper blade 20 on the upper outlet 1002 side.

[0076] like Figure 7B An example application of the compressed air foam mixer 100 with a single-layer blade arrangement is shown. The compressed air foam mixer 100 includes a housing 10 that forms a single-layer structure for arranging a single layer of blades 20. A cover 30 is fixed to the housing 10.

[0077] In addition, refer to Figure 7A and Figure 7B As illustrated, the compressed air foam mixer 100 is installed at the end of the ejection device 200 to shorten the conveying distance of the mixed compressed air foam and reduce conveying losses. Specifically, the ejection device 200 also includes a nozzle 201, the end of which has an outlet 2000. The compressed air foam mixer 100 is installed inside the nozzle 201, close to the outlet 2000 at the end of the nozzle 201, so that the compressed air foam formed by the compressed air foam mixer 100 can be directly ejected through the outlet 2000 after leaving the compressed air foam mixer 100, making the ejected foam basically uniform.

[0078] The spraying device 100, implemented as a foam generator, also includes a housing 202, within which the nozzle 201 and its opposite end are mounted. A cover plate 203 is also mounted on the other end of the nozzle 201. The housing 202 is generally tubular, having two opposing ends and one side end. One end is fitted with the nozzle 201, the opposite end is fitted with a capping assembly 204, and the side end is fitted with an outlet flange assembly 205 and a baffle plate 206.

[0079] Figures 8 to 9B An example of the ejection device 200A implemented as a foam mixer is shown. Specifically, the ejection device 200A includes a compressed air foam generator 100A. The ejection device 200A also includes a nozzle 201A and a fastening assembly 202A that fastens the nozzle 201A and the compressed air foam generator 100A together. Compressed air and foam mixture are respectively delivered to the nozzle 201A and enter the compressed air foam generator 100A. The compressed air foam generator 100A includes a housing 10A and blades 20A. The housing 10A has a mixing space 1000A, and the housing 10A also has an inlet 1001A and an outlet 1002A. The nozzle 201A and the housing 10A are sleeved together, with the end of the nozzle 201A extending into the inlet 1001A. A seal 203A is provided between the housing 10A and the nozzle 201A for sealing.

[0080] The end of the nozzle 201A forms an inlet limiting portion of the blade 20A on the side of the inlet 1001A.

[0081] The compressed air foam mixer 100A also includes a cover 30A, which in this example is integrally formed with the housing 10A. The inner diameter of the cover 30A is smaller than the inner diameter of the outlet 1002, and the cover 30A forms an outlet limiting portion for the blade 20A on the outlet 1002A side.

[0082] The nozzle 2000A of the ejection device 200A is formed at the end of the compressed air foam mixer 100A. After the compressed air and foam mixture are respectively delivered to the nozzle 201A, they enter the compressed air foam mixer 100A at the end, which drives the blade 20A to rotate so that they are mixed to form compressed air foam, which is then ejected through the nozzle 2000A.

[0083] Figures 8 to 9B An example of the compressed air foam mixer 100A with a single-blade design is shown; in other examples, the compressed air foam mixer 100A may be a double-blade or multi-blade design. Figure 10Aand Figure 10B As shown, the ejection device 200A is implemented as a foam mixer with at least two layers of blades 20A. The compressed air foam mixer 100A has a two-layer design, each layer having one mixing space 100A and two paired blades 20A. The nozzle 201 is sleeved on the inlet 1001A side, and the fastening assembly 202A fastens the nozzle 201A and the compressed air foam generator 100A together. The ejection outlet 2000A of the ejection device 200A is formed at the outlet 1002A side of the end of the compressed air foam mixer 100A. The cover 30A and the housing 10A are integrally formed.

[0084] Figure 11 and Figure 12 Another example is shown, in which the compressed air foam mixer 100B includes a single-layer housing 10B having a mixing space 1000B. Two paired blades 20B are disposed within the mixing space 1000B. The compressed air foam mixer 100B also includes a split cover 30B with a cover outlet 301B. The housing 10B has an inlet 1001B for the flow of compressed air and foam mixture into the mixing space 1000B and an outlet 1002B for the flow of mixed compressed air foam out of the mixing space 1000B. The outlet 1002B communicates with the cover outlet 301B.

[0085] Figures 13 to 16 It shows Figure 11 and Figure 12 The compressed air foam mixer 100B described in the example is applied to the spraying device 200B, wherein the spraying device 200B is a closed nozzle.

[0086] The ejection device 200B includes a nozzle 201B, which has multiple radially distributed mounting spaces for mounting multiple compressed air foam mixers 100B. The ejection device 200B also has an outlet 2000B.

[0087] The ejection device 200B also includes a locking component 202B, which is used to keep the ejection outlet 2000B in a normally closed state. It will only detach and open the ejection device 200B under a predetermined temperature environment.

[0088] Figure 14 and Figure 15 An example is shown of the compressed air foam mixer 100B with a single-layer blade design being applied to the ejection device 200B with a closed nozzle. Figure 16An example is shown of the compressed air foam mixer 100B with a double-layer blade design being applied to the ejection device 200B of a closed nozzle. The nozzle 201B is equipped with a plurality of compressed air foam mixers 100B each with a double-layer blade 20B.

[0089] Figures 17 to 19B A schematic diagram is shown of the compressed air foam mixer 200C being applied to the spraying device 200C implemented as an open nozzle. The spraying device 200C has a spray outlet 2000C, which is normally open.

[0090] Figure 18 and Figure 19A An example is shown of the compressed air foam mixer 100C with a single-layer blade design being applied to the ejection device 200C with an open nozzle. Figure 19B An example is shown of the compressed air foam mixer 100C with a double-layer blade design being applied to the ejection device 200C with an open nozzle. The nozzle 201C is equipped with multiple compressed air foam mixers 100C each with a double-layer blade 20C.

[0091] Figures 20A to 20D A schematic diagram is shown of the ejection device 200E implemented with a single compressed air foam mixer 100E. Figures 13 to 19B The example shown differs in that the compressed air foam mixer 100E is fitted over the nozzle 201C of the ejection device 200E, and the compressed air foam mixer 100E has a single layer of the blades 20E inside. Figure 20A and Figure 20B In this context, the nozzle 2000E is normally open. Figure 20C and Figure 20D In this device, the nozzle 2000E is normally closed. The nozzle device 200E also includes a locking component 202E, which is used to keep the nozzle 2000E in a normally closed state. It will only detach and open the nozzle device 200E under a predetermined temperature environment.

[0092] Figures 21 to 24 A schematic diagram of the spraying device 200D implemented as a fire sprinkler head is shown.

[0093] like Figures 21 to 23As shown, the ejection device 200D includes a nozzle 201D, and the compressed air foam mixer 100D is installed at the end of the nozzle 201D, close to the ejection outlet 2000D. The compressed air foam mixer 100D includes a housing 10D and a plurality of blades 20D. The housing 10D is provided with a plurality of mixing spaces 1000D, and each mixing space 1000D is provided with two blades 20D. The blades 20D are arranged rotationally symmetrically and are adapted to be pushed to rotate.

[0094] The housing 10D has multiple mixing spaces 1000D distributed on the same layer with the same height, and the blades 20D disposed in the mixing spaces 1000D are distributed at the same height.

[0095] The compressed air foam mixer 100D also includes a cover 30D, which is installed at the end of the housing 10D. The cover 30D has a plurality of cover outlets 301D, and the cover outlets 301D correspond one-to-one with the mixing space 1000D.

[0096] The ejection device 200D further includes a fixing component 202D, which fixes the compressed air foam mixer 100D inside the nozzle 201D. The fixing component 202D can be implemented as a bolt and nut, with corresponding fastening holes provided for the housing 10D, the cover 301, and the nozzle 201D. The bolt passes through the fastening holes and is secured by the nut. Further, the fixing component 202D fixes the compressed air foam mixer 100D to the end of the ejection device 200D, and is installed from the nozzle outlet 2000D to secure the compressed air foam mixer 100D.

[0097] The spraying device 200D also includes a base fixing assembly 203D, comprising a fixed base 2031D and a fastening assembly 2032D. The fixed base 2031D is installed at the other end of the nozzle 201D, opposite to the compressed air foam mixer 100D. Bolts of the fastening assembly 2032D pass sequentially through the fixed base 203D, the housing 10D, and the cover 30D, and are secured to the fixed base 203D by nuts in the fastening assembly 2032D.

[0098] After compressed air and foam mixture are delivered to the nozzle 201D, they enter the mixing space 1000D of the compressed air foam mixer 100D. The power of the compressed air and foam mixture drives the blade 20D to rotate. The rotation of the blade 20D drives the compressed air and foam mixture to mix, forming compressed air foam, which finally flows out through the cover outlet 301 and is sprayed out from the spray outlet 2000D.

[0099] Figure 23 An example is shown of the compressed air foam mixer 100D with a double-blade design being applied to the spray device 200D of a fire monitor. Figure 24 An example is shown of the compressed air foam mixer 100D with a single-layer blade design being applied to the spray device 200D of a fire monitor head. The nozzle 201D is equipped with a compressed air foam mixer 100D with a single-layer blade 20D.

[0100] In summary, the compressed air foam mixer can be applied to various spraying devices to achieve end-of-pipe mixing, resulting in finer, more fully foamed compressed air foam with a high foaming ratio, high viscosity, and good coverage.

[0101] The above embodiments describe the basic principles of the present invention. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the specific details described above.

[0102] The block diagrams of devices, apparatuses, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as "comprising," "including," "having," etc., are open-ended terms meaning "including but not limited to" and are used interchangeably with them. The terms "or" and "and / or" as used herein are used interchangeably with them unless the context clearly indicates otherwise. The term "such as" as used herein refers to the phrase "such as but not limited to" and is used interchangeably with it.

[0103] It should also be noted that in the apparatus, device, and method of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of the present invention.

[0104] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0105] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A compressed air foam mixer for mixing compressed air and foam mixture, characterized in that, include: At least one housing, the housing being provided with at least one through-hole mixing space; as well as At least one blade, each blade being mounted in each of the mixing spaces, wherein compressed air and foam mixture enter the mixing space to drive the blade to rotate so as to be mixed into compressed air foam.

2. The compressed air foam mixer according to claim 1, characterized in that, The blade includes a first blade portion, a curved portion, and a second blade portion that are integrally formed and connected in sequence. The first blade portion and the second blade portion are symmetrically distributed on both sides of the curved portion about the rotation axis of the blade.

3. The compressed air foam mixer according to claim 2, characterized in that, The curved portion includes a first curved portion and a second curved portion that are rotationally symmetrical about the axis of rotation, and the first curved portion and the second curved portion have opposite bending directions.

4. The compressed air foam mixer according to claim 1, characterized in that, The blades are axial flow blades or mixed flow blades, and the compressed air foam mixer includes one or more layers of structure. When it has two or more layers of structure, at least two of the housings are stacked to install at least two layers of the blades.

5. The compressed air foam mixer according to claim 1, characterized in that, The housing includes a bottom wall and a top wall. The mixing space extends through the housing, forming an inlet on the bottom wall and an outlet on the top wall. An inlet limiting portion is provided on one side of the inlet, and an outlet limiting portion is provided on one side of the outlet, to respectively limit the rotation angle of the blade in the direction of the inlet and the direction of the outlet.

6. The compressed air foam mixer according to claim 5, characterized in that, The compressed air foam mixer also includes a cover located on the outlet side of the housing.

7. The compressed air foam mixer according to claim 6, characterized in that, The cover is provided with a plurality of cover outlets, the cover outlets are located on the outlet side of the housing, and the inner diameter of the cover outlet is smaller than the inner diameter of the outlet, such that the part of the edge of the cover that defines the cover outlet forms the outlet limiting part.

8. The compressed air foam mixer according to claim 7, characterized in that, The cover and the shell are formed separately, or the cover and the shell are formed integrally.

9. A spraying device for spraying mixed compressed air foam, characterized in that, include: Compressed air foam mixer as described in any one of claims 1 to 8; as well as, It also has a nozzle, and the compressed air foam mixer is disposed inside the nozzle, located at the end of the ejection device, wherein compressed air and the foam mixer are delivered separately and mixed by the compressed air foam mixer after reaching the compressed air foam mixer to generate compressed air foam for ejection through the nozzle.

10. The ejection device according to claim 9, characterized in that, The spraying device is selected from one of the following: foam generator, foam mixer, nozzle, foam gun, and fire monitor.

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