Jetting device and fire rescue equipment

Abstract

The application relates to the technical field of fire rescue, and discloses a spraying device and fire rescue equipment, the spraying device comprising: a feeding cylinder, a mixed foam inlet being arranged on a cylinder wall of the feeding cylinder; and a feeding core, which is arranged in a cylinder cavity of the feeding cylinder and is formed with a liquid inlet channel and a coagulant inlet and a coagulant outlet which are respectively connected to the liquid inlet channel; wherein the cylinder cavity comprises an axial communication feeding cavity and a preliminary mixing cavity, the feeding cavity is an annular cavity formed between an outer peripheral wall of the feeding core and an inner peripheral wall of the feeding cylinder, the mixed foam inlet is connected to the feeding cavity, and the coagulant outlet is connected to the preliminary mixing cavity. The spraying device and the fire rescue equipment can realize rapid fire extinguishing for a complex and emergency fire rescue site, and the fire extinguishing effect is good.

Description

Technical Field

[0001] This application belongs to the field of fire rescue technology, and specifically relates to a spraying device and fire rescue equipment. Background Technology

[0002] Currently, the main fire extinguishing material in my country is foam extinguishing agent. With the improvement of urbanization in my country, emergency rescue scenarios such as high-rise buildings and large fire scenes are gradually increasing, and the rescue situation is becoming more and more complex and urgent. The fire extinguishing effect of foam extinguishing agent is not good and cannot be fully adapted to these large-scale fire rescue scenes. Summary of the Invention

[0003] The purpose of this application is to provide a spraying device and fire rescue equipment that can quickly extinguish fires in complex and urgent fire rescue scenes with good fire extinguishing effect.

[0004] To achieve the above objectives, this application provides a spraying device, which includes:

[0005] A feed cylinder, wherein a foam mixing inlet is provided on the cylinder wall; and

[0006] The feed core is inserted into the cavity of the feed cylinder and forms a liquid inlet channel and a coagulant inlet and a coagulant outlet respectively connected to the liquid inlet channel;

[0007] The cylinder cavity includes a feed chamber and a preliminary mixing chamber that are connected along the axial direction. The feed chamber is an annular cavity formed between the outer peripheral wall of the feed core and the inner peripheral wall of the feed cylinder. The mixed foam inlet is connected to the feed chamber, and the coagulant outlet is connected to the preliminary mixing chamber.

[0008] In some specific embodiments, the central axis of the mixing foam inlet may be radially offset relative to the central axis of the feed chamber to be arranged in an off-plane manner.

[0009] In some specific embodiments, the central axis of the mixing foam inlet and the central axis of the feeding chamber may be arranged perpendicularly to each other; and / or, the central axis of the mixing foam inlet is tangent to the peripheral wall of the feeding chamber.

[0010] In some specific embodiments, the cross-sectional area of ​​the feed chamber is larger than the cross-sectional area of ​​the preliminary mixing chamber.

[0011] In some specific embodiments, the coagulant outlet is provided in multiple locations and is arranged at equal intervals along the circumference of the feed core on the peripheral wall of the feed core.

[0012] In some specific embodiments, the cross-sectional area of ​​the initial mixing chamber gradually increases axially forward; and / or,

[0013] The diameter of the coagulant outlet is greater than or equal to 1 mm and less than or equal to 5 mm.

[0014] In some specific embodiments, the coagulant outlet is located on the axial front end face of the feed core, and the injection device further includes:

[0015] A slotted plug is placed in the primary mixing chamber and blocks the coagulant outlet at its axial rear end;

[0016] A support assembly, axially position adjustable, is disposed on the wall of the feed cylinder and located axially in front of the slotted plug; and

[0017] An elastic element abuts between the slotted plug and the support assembly;

[0018] The support assembly changes the initial compression of the elastic element by connecting to different axial positions on the wall of the feed cylinder.

[0019] In some specific embodiments, the support component may include:

[0020] Adjust the transition piece, which is threadedly connected to the wall of the feed cylinder; and

[0021] The support base abuts between the adjusting transition member and the elastic member.

[0022] In some specific embodiments, a sealing element is provided on the sealing surface of the slotted plug.

[0023] In some specific embodiments, the injection device may further include a mixing tube disposed axially forward of the feed cylinder, the cavity of the mixing tube comprising:

[0024] The mixing chamber is connected to the preliminary mixing chamber. The mixing chamber is provided with mixing components arranged along the axial direction. The multiple mixing components include at least one of SK type positive and negative spiral blades, standard SY type mixer blades, SD type mixer blades, baffles, and baffle rods.

[0025] In some specific embodiments, the lumen of the mixing tube may further include:

[0026] A rectifier cavity is located axially in front of and connected to the mixing cavity. The rectifier cavity is provided with a rectifier assembly, which forms multiple rectifier channels arranged parallel to each other along the axial direction.

[0027] In some specific embodiments, the rectifying assembly may include a plurality of circumferentially spaced flat blades with the blade surfaces extending along the discharge direction of the rectifying cavity; and / or,

[0028] The rectifying assembly includes multiple straight cylindrical components with interconnected walls. In some specific embodiments, the rectifying assembly has a central shaft extending rearward along the axial direction, and the central shaft is connected to the stirring and mixing assembly.

[0029] In some specific embodiments, the spraying device may further include:

[0030] The nozzle is connected to the axial front end of the mixing tube and has an internal spray chamber. The spray chamber is connected to the rectifier chamber. The axial front end of the spray chamber has a spray port and is tapered along the spray direction.

[0031] In some specific embodiments, the spraying device may further include:

[0032] A switching valve is connected between the mixing pipe and the feed cylinder. The switching valve has a switching valve transition chamber and a valve core. The switching valve transition chamber is connected between the stirring mixing chamber and the preliminary mixing chamber. The valve core is disposed between the switching valve transition chamber and the preliminary mixing chamber and can connect or disconnect the switching valve transition chamber and the preliminary mixing chamber.

[0033] A second aspect of this application also provides a fire rescue device that includes the aforementioned spraying device.

[0034] The above technical solution divides the feed cylinder cavity into a feed chamber and a preliminary mixing chamber. The foam gelling agent mixture is injected into the feed chamber from the cylinder wall, flows turbulently, and then enters the preliminary mixing chamber axially. The coagulant is injected into the preliminary mixing chamber from the feed core located in the middle, and undergoes a preliminary mixing reaction with the foam gelling agent mixture. Because the feed chamber is annular, the turbulence intensity is higher, and the subsequent mixing contact area between the coagulant and the foam gelling agent mixture is also higher. This significantly shortens the gelation reaction time and produces a finer gel foam, enabling the gel foam to effectively achieve cooling, isolation, and fire resistance at fire scenes, providing rapid fire extinguishing and long-term fire isolation. Furthermore, under the same cross-sectional area, the annular cross-section has a higher mixing contact area and higher turbulence intensity than the circular cross-section. The annular feed chamber and its turbulent-then-mixing method result in higher gel foam generation efficiency, facilitating the miniaturization and portability of the spraying device. This makes it suitable for complex and urgent fire scenes such as high-rise building fires, forest fires, chemical raw material fires, and the creation of forest firebreaks.

[0035] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0036] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0037] Figure 1 This is a cross-sectional view of a spraying device according to a specific embodiment of this application;

[0038] Figure 2 for Figure 1 A cross-sectional view of the feed structure in the middle;

[0039] Figure 3 for Figure 1 A schematic diagram of the feeding structure in the middle;

[0040] Figure 4 for Figure 3 A cross-sectional view of position AA in the diagram;

[0041] Figure 5 , Figure 6 and Figure 7 These are schematic diagrams of the rectifier assembly according to different embodiments of this application;

[0042] Figure 8 This is an exploded view of the installation of the feeding structure according to another specific embodiment of this application;

[0043] Figure 9 for Figure 8 A schematic diagram of the feeding structure assembly;

[0044] Figure 10 for Figure 9 A cross-sectional view at position BB in the middle;

[0045] Figure 11 for Figure 9 A cross-sectional view at position CC.

[0046] Explanation of reference numerals in the attached figures

[0047] 1. Feed cylinder 11. Mixing foam inlet

[0048] 12 Feeding chamber 13 Preliminary mixing chamber

[0049] 14. Discharge port 2. Feed core

[0050] 21. Flocculant outlet; 22. Liquid inlet channel

[0051] 23 Accelerator Inlet 3 Mixing Pipe

[0052] 31 Mixing chamber 32 Mixing assembly

[0053] 33 Rectifier cavity 34 Rectifier assembly

[0054] 35 Central axis 4 Nozzle

[0055] 41. Injection chamber 42. Injection nozzle

[0056] 5. Switching valve 51. Switching valve transition chamber

[0057] 52 Valve core 61 Grooved plug

[0058] 62 Elastic component 63 Adjustable transition component

[0059] 64 Support base Detailed Implementation

[0060] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0061] As emergency rescue scenarios involving high-rise buildings and large fires become increasingly common, and the situation at fire scenes becomes more complex and urgent, the demand for extinguishing agents and emergency rescue devices that integrate multiple functions such as rapid fire extinguishing, heat insulation, and flame retardancy is becoming more urgent.

[0062] Foam extinguishing agents are currently the main fire-fighting materials in my country. Conventional water-based foam extinguishing agents are liquid foams, which, although they can be deployed quickly for fire suppression, have poor fire resistance (within 4 minutes at 1000℃) and short foam retention time (usually within 20 minutes), making it difficult to achieve long-term fire isolation. In contrast, silicate-based inorganic gel extinguishing agents are solid foams. They not only possess the good flowability and sealing properties of ordinary foams but also have outstanding advantages such as exceptionally good fire resistance (over 20 minutes at 1000℃) and long foam retention time (over 24 hours). However, due to the long gelation time, large size, and inconvenience of gel extinguishing agents, they are currently mainly used in coal fire suppression.

[0063] In view of this, the inventors of this application, after continuous consideration, have provided a spraying device that is not only small and portable, but also capable of foaming commonly used gel fire extinguishing agents, thereby greatly shortening the gelation time. This device is suitable for rapid fire extinguishing in complex fire scenes such as high-rise building fires, forest fires, chemical raw material fires, and the establishment of forest firebreaks.

[0064] like Figure 1 , Figure 2 as well as Figure 3As shown, the spraying device of this application includes an annular feed chamber 12, a preliminary mixing chamber 13, a foam mixing inlet 11, a coagulant outlet 21, and a nozzle 4. The feed chamber 12 is connected to the preliminary mixing chamber 13. The foam mixing inlet 11 is disposed on the periphery of the feed chamber 12 and is used to feed the foam gelling agent mixture toward the feed chamber 12. The coagulant outlet 21 is connected to the preliminary mixing chamber 13 and is used to feed the coagulant toward the preliminary mixing chamber 13. Thus, the foam gelling agent mixture entering the feed chamber 12 first undergoes turbulence, and then enters the preliminary mixing chamber 13, where it is initially mixed with the coagulant outlet 21. The nozzle 4 is disposed axially in front of the preliminary mixing chamber 13 and is used to spray out the gel foam mixture after the foam gelling agent mixture and the coagulant have reacted.

[0065] In this application, by setting the feed chamber 12 of the spraying device to an annular shape, the turbulence intensity of the foam gelling agent mixture is increased, resulting in a larger mixing contact area between the subsequent accelerator and the foam gelling agent mixture. This significantly shortens the gel reaction time and produces a finer gel foam, enabling the gel foam to effectively achieve cooling, isolation, and fire resistance at the fire scene, thus providing rapid fire extinguishing and long-term fire isolation. The foam gelling agent mixture is formed by mixing water, fire extinguishing foam liquid, and gelling agent under the action of compressed air.

[0066] Furthermore, under the same cross-sectional area, the annular cross-section has a higher mixing contact area and higher turbulence intensity than the circular cross-section. The annular feed chamber 12 can make the gel foam generation efficiency higher, which is conducive to the miniaturization and portability of the spraying device. It is suitable for complex and emergency fire scenes such as high-rise building fires, forest fires, chemical raw material fires, and the opening of forest firebreaks.

[0067] Optionally, the location and shape of the outlet of the feed chamber 12 can be varied. For example, it can be located on the peripheral wall of the feed chamber 12 or on the axial front end baffle of the feed chamber 12. The outlet shape can be arc-shaped, square, or circular, or other shapes. This application is not limited to these.

[0068] In some specific embodiments, the axial front end of the feed chamber 12 may have an annular outlet, and the preliminary mixing chamber 13 is located axially in front of the feed chamber 12 and communicates with the annular outlet. The annular outlet is located at the axial front end of the feed chamber 12, that is, the annular opening at the axial front end of the feed chamber 12 can be an annular outlet. The discharge area of ​​the annular outlet is relatively large, which makes it less likely for the initial gel agglomerates caused by a brief stop in spraying to clog the outlet, thus improving the reliability of the spraying device.

[0069] It should be noted that the cavity wall structure of the feeding cavity 12 and the preliminary mixing cavity 13 can be varied. For example, it can be assembled from multiple parts or it can be a one-piece molded structure.

[0070] Furthermore, the location and number of the mixing foam inlet 11 and the coagulant outlet 21 can vary. For example, the mixing foam inlet 11 can be located on the inner or outer peripheral wall of the feed chamber 12, and the coagulant outlet 21 can be located on the inner or outer peripheral wall of the preliminary mixing chamber 13; or, the mixing foam inlet 11 and the coagulant outlet 21 can be located at the same or different circumferential positions; or, one or more mixing foam inlets 11 and coagulant outlets 21 can be provided respectively, etc. This application is not limited to these.

[0071] In some specific implementations, such as Figure 1 , Figure 2 as well as Figure 3 As shown, the injection device may include a feed cylinder 1 and a feed core 2, with the feed core 2 passing through the cavity of the feed cylinder 1. The cavity of the feed cylinder 1 includes a feed chamber 12 and a preliminary mixing chamber 13, with the annular feed chamber 12 formed between the outer peripheral wall of the feed core 2 and the inner peripheral wall of the feed cylinder 1. A mixing foam inlet 11 is provided and formed on the cylinder wall of the feed cylinder 1. A liquid inlet channel 22, a coagulant inlet 23, and a coagulant outlet 21 are formed on the feed core 2, with the coagulant inlet 23 and the coagulant outlet 21 respectively connected to the liquid inlet channel 22. The mixing foam inlet 11 is connected to the feed chamber 12, and the coagulant outlet 21 is connected to the preliminary mixing chamber 13. Because a small amount of coagulant is injected into the preliminary mixing chamber 13 from the feed core 2 located in the middle, and a large amount of foam gelling agent mixture is injected into the feed chamber 12 from the wall of the feed cylinder 1 and then enters the preliminary mixing chamber 13 after turbulence, this method of mixing the large amount of fluid with the small amount of fluid after turbulence can further improve the efficiency of gel foam generation, shorten the gel reaction time, and make the generated gel foam finer.

[0072] In addition, such as Figure 1 , Figure 2 as well as Figure 3 As shown, the feed cylinder 1 is a hollow cylinder. The feed core 2 is inserted into the feed cylinder 1 through the open rear end of the cylinder cavity and closes the open rear end of the feed cylinder 1. The coagulant inlet 23 is located at the axial rear end of the feed core 2, and the liquid inlet channel 22 is arranged axially and coaxially with the feed core 2.

[0073] In some specific embodiments, to further enhance the turbulent flow of the foam gel agent mixture in the feed chamber 12, such as Figure 4 and Figure 5 As shown, the central axis of the mixing foam inlet 11 can be radially offset relative to the central axis of the feeding chamber 12 to be arranged in opposite directions, so that the central axis of the mixing foam inlet 11 and the central axis of the feeding chamber 12 are offset by a certain distance S, causing the foam gel agent mixture to swirl.

[0074] Optionally, the distance between the central axis of the mixing foam inlet 11 and the central axis of the feed chamber 12 may be greater than or equal to 5 mm and less than or equal to 40 mm.

[0075] Furthermore, in order to enhance the swirling effect, the central axis of the mixing foam inlet 11 can be arranged perpendicularly to the central axis of the feed chamber 12.

[0076] Furthermore, the central axis of the foam mixing inlet 11 can be tangent to the peripheral wall of the feed chamber 12, thus enhancing the swirling effect of the foam gelling agent mixture.

[0077] In some specific embodiments, in order to make the structure of the injection device more reasonable and reliable, the feed core 2 can be arranged coaxially with the feed cylinder 1 and / or the cylinder cavity of the feed cylinder 1.

[0078] Optionally, such as Figure 1 , Figure 2 as well as Figure 3 As shown, multiple coagulant outlets 21 are provided and are arranged at equal intervals along the circumference on the peripheral wall of the feed core 2, and are located at the axial front of the feed core 2.

[0079] The diameter of the coagulant outlet 21 can be set to be greater than or equal to 1 mm and less than or equal to 5 mm. This not only facilitates the processing of the coagulant outlet 21 and prevents clogging, but also ensures the injection flow rate of the coagulant in the coagulant outlet 21, thereby improving the mixing effect of the coagulant and foam gelling agent mixture.

[0080] Optionally, since the output flow rates of the foam gelling agent mixture and the coagulant are quite different, in order to further improve the mixing effect of the foam gelling agent mixture and the coagulant and increase the efficiency of gel foam generation, the structure of the feed chamber 12 and the preliminary mixing chamber 13 can be further optimized.

[0081] like Figure 2 and Figure 3 As shown, along the axial direction of the feed chamber 12, the coagulant outlet 21 is located axially in front of the foam mixing inlet 11, and the preliminary mixing chamber 13 is located axially in front of the feed chamber 12. Since the output flow rate of the foam gelling agent mixture is relatively large, while the output flow rate of the coagulant is relatively small, if the cross-sectional area of ​​the feed chamber 12 is too small, the circulation effect of the foam gelling agent mixture will be insignificant; if the cross-sectional area of ​​the preliminary mixing chamber 13 is too large, the flow rate of the coagulant will be low, which is not conducive to the outflow of the coagulant. Therefore, the cross-sectional area of ​​the feed chamber 12 can be set to be larger than the cross-sectional area of ​​the preliminary mixing chamber 13. In this way, the larger cross-sectional area of ​​the feed chamber 12 is conducive to the circulation of the foam gelling agent mixture, and the smaller cross-sectional area of ​​the preliminary mixing chamber 13 can increase the flow rate of the coagulant, thereby making the feed structure more reasonable and the mixing effect of the foam gelling agent mixture and the coagulant better.

[0082] Among them, such as Figure 2 and Figure 3 As shown, in order to make the cross-sectional area of ​​the feeding chamber 12 larger than that of the preliminary mixing chamber 13, the outer diameter of the feeding chamber 12 can be set to be larger than that of the preliminary mixing chamber 13, and the circumference of the feeding chamber 12 is larger than that of the preliminary mixing chamber 13.

[0083] Furthermore, the appropriate setting of the cross-sectional area of ​​the feed chamber 12 is also crucial. If the cross-sectional area of ​​the feed chamber 12 is too small, the pressure loss during injection of the foam gel agent mixture will be high, resulting in a low jet velocity and short range for the same total pressure. Conversely, if the cross-sectional area of ​​the feed chamber 12 is too large, the turbulence effect of the foam gel agent mixture will be poor, and the mixing effect with the coagulant will also be inadequate. Therefore, the ratio between the inner diameter and the outer diameter of the feed chamber 12 can be set to be greater than or equal to 0.7 and less than or equal to 0.99. This ensures that the cross-sectional area of ​​the feed chamber 12 is suitable, guaranteeing sufficient mixing of the foam gel agent mixture and the coagulant.

[0084] In addition, such as Figure 2 and Figure 3 As shown, along the discharge direction of the feed chamber 12, the coagulant outlet 21 is located at the axial rear end of the preliminary mixing chamber 13. The cross-sectional area of ​​the preliminary mixing chamber 13 gradually increases, so that the feed chamber 12 and the preliminary mixing chamber 13 together form a discharge structure that first contracts and then expands. Thus, when the mixture accelerates through the axial front end of the preliminary mixing chamber 13, the pressure decreases. Utilizing the Venturi effect, the coagulant can be better ejected, which is beneficial for the coagulant to enter the preliminary mixing chamber 13. Specifically, to achieve the gradual increase in the cross-sectional area of ​​the preliminary mixing chamber 13 towards the front, as shown... Figure 2 and Figure 3 As shown, the outer diameter of the portion of the feed core 2 located between the coagulant outlet 21 and the discharge port 14 can be set to gradually decrease forward.

[0085] Since the injection device stops injecting and the coagulant stops being injected after the injection switch valve is closed, when the injection pressure of the coagulant is less than or equal to the external fluid pressure, under the action of pressure fluctuation (water hammer effect), the foam liquid mixed with the coagulant may flow back into the coagulant injection structure, causing blockage.

[0086] To further effectively prevent the deposition and clogging of gel foam, this application further optimizes the initial mixing structure of the foam gelling agent mixture and the coagulant. Specifically, as... Figure 8 , Figure 9 , Figure 10 as well as Figure 11As shown, a coagulant outlet 21 can be provided and located on the axial front end face of the feed core 2. The injection device also includes a slotted plug 61, a support assembly, and an elastic element 62. The slotted plug 61 is provided in the preliminary mixing chamber 13, and the axial rear end of the slotted plug 61 blocks the coagulant outlet 21. The support assembly is provided on the cylinder wall of the feed cylinder 1 and located axially in front of the slotted plug 61. The elastic element 62 abuts between the slotted plug 61 and the support assembly, so that the axial rear end of the slotted plug 61 can be pressed against the coagulant outlet 21 by the elastic force of the elastic element 62, so that the gap between the slotted plug 61 and the coagulant outlet 21 is equal to 0, thereby preventing backflow.

[0087] Furthermore, to further improve the smoothness of the coagulant discharge, the support component can adjust its axial connection position on the wall of the feed cylinder 1. That is, by connecting to different axial positions on the wall of the feed cylinder 1, the initial compression of the elastic element 62 can be changed, thereby changing the flow rate of the coagulant.

[0088] Specifically, considering that the flow rate of the coagulant is much smaller than that of the foam liquid, and that the gap x between the required slotted plug 61 and the coagulant outlet 21 is much smaller than the diameter of the coagulant outlet 21, according to the force balance, the gap x has the following relationship with the coagulant injection pressure Pc and the pressure Pp of the foam liquid in the initial mixing chamber:

[0089] k×(Δx0+x)≈(P c -P p )×A

[0090] Wherein, the initial compression amount Δx0 of the elastic element 62 is the compression amount of the elastic element 62 when the gap x = 0; k is the spring stiffness of the elastic element 62; A is a coefficient related to the structural dimensions of the slotted plug 61 and the diameter d of the coagulant outlet 21.

[0091] Clearly, at a certain moment, the pressure at each location remains constant instantaneously, the gap x is positively correlated with Δx0, and according to Bernoulli's theorem, the coagulant flow rate q c satisfy:

[0092] q c =C×x×π×d

[0093] Where C is a coefficient (instantaneously invariant) related to the accelerator injection pressure and the pressure of the foam liquid at the gap position, therefore the accelerator flow rate q c It is positively correlated with the initial compression amount Δx0, that is, by adjusting the relative axial position of the support assembly and the feed cylinder 1, the initial compression amount Δx0 of the elastic element 62 can be changed, thereby adjusting the flow rate of the coagulant.

[0094] Optionally, the support assembly includes an adjusting transition member 63 and a support base 64. The adjusting transition member 63 is threadedly connected to the wall of the feed cylinder 1, and the support base 64 abuts against the adjusting transition member 63 and the elastic member 62. By rotating the threaded connection position between the adjusting transition member 63 and the feed cylinder 1, the initial compression amount Δx0 of the elastic member 62 can be changed, thereby adjusting the coagulant flow rate.

[0095] Specifically, such as Figure 8 , Figure 9 , Figure 10 as well as Figure 11 As shown, the outer peripheral wall of the feed cylinder 1 is stepped. The outer diameter of the outer peripheral wall at the axial front end of the feed cylinder 1 is smaller than the outer diameter of the outer peripheral wall at the axial rear end, and the outer peripheral wall at the axial front end of the feed cylinder 1 is provided with external threads. The adjusting transition member 63 has a hollow stepped cylindrical cavity. The inner peripheral wall at the axial rear end of the adjusting transition member 63 is provided with internal threads. The diameter of the inner peripheral wall at the axial front end of the adjusting transition member 63 is smaller than the diameter of the inner peripheral wall at the axial rear end, thereby forming an annular support portion on the inner peripheral wall at the axial front end and the inner peripheral wall at the axial rear end. The axial front end of the support base 64 can abut against the annular support portion for limiting.

[0096] It should be noted that, in addition to the structures described above, the threaded connection structure between the support assembly and the feed cylinder 1 can also include, for example, an internal thread on the inner circumferential wall of the axial front end of the feed cylinder 1, an external thread on the outer circumferential wall of the axial front end of the adjusting transition member 63, and the axial front end of the support base 64 abutting against the axial rear end face of the adjusting transition member 63 for positioning. Furthermore, besides adjusting the connection position through a threaded connection, the feed cylinder 1 and the support assembly can also be configured as a piston structure, with a locking structure used to lock the position, etc. This application is not limited to these methods.

[0097] Optionally, such as Figure 8 , Figure 9 , Figure 10 as well as Figure 11 As shown, the support base 64 includes a front abutment rod located at the axial front end and a limiting part located at the axial rear end. The diameter of the limiting part is larger than the diameter of the front abutment rod and it is provided with multiple flow channels arranged circumferentially at intervals. The walls of the flow channels extend axially rearward to form cutting blades. The slotted plug 61 includes a rear abutment rod, a limiting ring platform, and a sealing plunger connected sequentially from front to back along the axial direction. The diameter of the limiting ring platform is larger than the diameters of the rear abutment rod and the sealing plunger. The axial rear end of the sealing plunger is provided with a guide tip. The elastic element 62 is a spring, with its two ends respectively sleeved on the rear abutment rod and the front abutment rod, and respectively abutting against the limiting ring platform and the limiting part.

[0098] Furthermore, to ensure more thorough mixing and gelation of the foam gelling agent mixture and the accelerator, and to break up any initial gel clumps caused by brief cessation of spraying, such as... Figure 1 and Figure 2 As shown, the spraying device may also include a mixing pipe 3 disposed axially in front of the feed cylinder 1. The cavity of the mixing pipe 3 includes a stirring and mixing chamber 31, which is connected to the preliminary mixing chamber 13. A stirring and mixing component 32 is provided in the stirring and mixing chamber 31. In this way, sufficient fluid impact and stirring can be brought to the gel foam mixture, making the foam finer and the gel more uniform.

[0099] The mixing assembly 32 may include at least one of the following: SK-type forward and reverse spiral mixing blades, standard SY-type mixer blades, SD-type mixer blades, baffles, and baffle rods. The SK-type forward and reverse spiral mixing blades include forward spiral mixing blades and reverse spiral mixing blades arranged alternately along the axial direction of the mixing chamber 31. Multiple baffles may be provided in an alternating pattern (up, down, left, and right), and several baffle rods may be arranged at intervals along the axial direction and at angles to each other.

[0100] Furthermore, such as Figure 1 and Figure 2 As shown, the cavity of the mixing tube 3 may further include a rectifying cavity 33, which is located axially in front of and connected to the mixing cavity 31. The rectifying cavity 33 is equipped with a rectifying assembly 34, which forms multiple rectifying channels arranged parallel to each other along the axial direction. This prevents the dispersion of the ejected foam caused by the swirling flow of the mixing assembly 32, resulting in a smoother foam flow and thus enhancing the outflow range and impact force of the gel foam, which is beneficial for fire extinguishing penetration.

[0101] Optionally, the rectifier assembly 34 may include a plurality of circumferentially spaced flat blades with the blade surfaces extending along the discharge direction of the rectifier cavity 33. Alternatively, as... Figure 6 and Figure 7 As shown, the rectifier assembly 34 may include multiple straight cylindrical members with interconnected cylindrical walls, and the multiple straight cylindrical members are provided with multiple rectifier channels arranged parallel to each other along the axial direction.

[0102] Optionally, to facilitate fixing the positions of the mixing assembly 32 and the rectifier assembly 34, such as... Figure 1 and Figure 2 As shown, the rectifier assembly 34 extends axially to the rear with a central shaft 35, and the rear end of the central shaft 35 is connected to the stirring and mixing assembly 32.

[0103] In some specific implementations, such as Figure 1 and Figure 2 As shown, the nozzle 4 is connected to the axial front end of the mixing tube 3 and has an internal spraying chamber 41. The spraying chamber 41 is connected to the rectifier chamber 33. The axial front end of the spraying chamber 41 has a spraying port 42 and is tapered along the spraying direction. In this way, the spraying effect of the gel foam is better.

[0104] Optionally, such as Figure 1 and Figure 2As shown, the injection device may further include a switching valve 5, which is connected between the mixing pipe 3 and the feed cylinder 1. The switching valve 5 has a switching valve transition chamber 51 and a valve core 52. The switching valve transition chamber 51 connects the stirring mixing chamber 31 and the preliminary mixing chamber 13. The valve core 52 is disposed between the switching valve transition chamber 51 and the preliminary mixing chamber 13 and can connect or disconnect the switching valve transition chamber 51 and the preliminary mixing chamber 13. Thus, the opening or closing of the preliminary mixing chamber 13 of the injection device can be controlled by the switching valve 5, and / or the injection volume of the preliminary mixing chamber 132 of the injection device can be controlled by the switching valve 5. The switching valve 5 may be a ball valve or a cone valve, etc. This application is not limited to this. The structure for opening and closing the switching valve 5 or regulating the flow rate is well known to those skilled in the art and is not part of the core improvement of this application, so it will not be described in detail here.

[0105] Optionally, such as Figure 1 and Figure 2 As shown, the transition chamber 51 of the switching valve is disposed in the valve body of the switching valve 5, and the valve core 52 is also connected to the operating valve rod, which is rotatably connected to the valve body of the switching valve 5. The two ends of the valve body of the switching valve 5 are respectively inserted and connected to the front end of the feed cylinder 1 and the rear end of the mixing pipe 3, and the front end of the mixing pipe 3 is inserted and connected to the rear end of the nozzle 4.

[0106] In some specific embodiments, another aspect of this application provides a fire rescue device that includes the aforementioned spraying device and therefore possesses all the technical effects brought about by the spraying device, so it will not be described again.

[0107] It should be noted that, in this application, unless otherwise stated, directional terms such as "inner" refer to a position relatively close to the central axis of the feed cylinder 1, "outer" refer to a position relatively far from the central axis of the feed cylinder 1; "front" refers to a position relatively close to the nozzle 4 along the central axis of the feed cylinder, and "rear" refers to a position relatively far from the nozzle 4 along the central axis of the feed cylinder.

[0108] In summary, the spraying and extinguishing devices of this application employ a confluence method where the coagulant is injected from the center and the mixed foam is injected vertically from the outside towards the central axis. Furthermore, the mixed foam inlet and the central axis of the feeding chamber are offset, effectively creating high turbulence. Additionally, the mixing chamber uses a forward and reverse spiral mixing method, resulting in finer gel foam and more uniform gelation. Simultaneously, a rectifier component is added to the rectifying chamber, making the gel foam flow smoother, enhancing the outflow range and impact force, and facilitating fire penetration. Therefore, the spraying and extinguishing devices of this application not only achieve rapid fire extinguishing and long-term fire isolation but also achieve miniaturization and portability, making them suitable for complex and urgent fire scenes such as high-rise building fires, forest fires, chemical raw material fires, and the creation of forest firebreaks.

[0109] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0110] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0111] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0112] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A spraying device, characterized in that, include: Feed cylinder (1), the cylinder wall of which is provided with a mixing foam inlet (11). and The feed core (2) is inserted into the cavity of the feed cylinder (1) and forms a liquid inlet channel (22) and a coagulant inlet (23) and a coagulant outlet (21) respectively connected to the liquid inlet channel (22). The cylinder cavity includes an axially connected feed chamber (12) and a preliminary mixing chamber (13). The feed chamber (12) is an annular cavity formed between the outer peripheral wall of the feed core (2) and the inner peripheral wall of the feed cylinder (1). The outer diameter of the feed chamber (12) is set to be larger than the outer diameter of the preliminary mixing chamber (13). The coagulant outlet (21) is located at the axial rear end of the preliminary mixing chamber (13). The outer diameter of the portion of the feed core (2) located between the coagulant outlet (21) and the outlet of the preliminary mixing chamber (13) is set to gradually decrease forward. The mixed foam inlet (11) is connected to the feed chamber (12) and is used to deliver the foam gel agent mixture toward the feed chamber (12). The coagulant outlet (21) is connected to the preliminary mixing chamber (13) and is used to deliver the coagulant toward the preliminary mixing chamber (13).

2. The spraying device according to claim 1, characterized in that, The central axis of the mixing foam inlet (11) is radially offset relative to the central axis of the feed chamber (12) to form an out-of-plane arrangement.

3. The spraying device according to claim 2, characterized in that, The central axis of the mixing foam inlet (11) is arranged perpendicularly to the central axis of the feed chamber (12); and / or, The central axis of the mixed foam inlet (11) is tangent to the peripheral wall of the feed chamber (12).

4. The spraying device according to claim 1, characterized in that, The cross-sectional area of ​​the feed chamber (12) is larger than the cross-sectional area of ​​the preliminary mixing chamber (13).

5. The spraying device according to claim 1, characterized in that, The coagulant outlet (21) has multiple outlets and is arranged at equal intervals along the circumference of the feed core (2).

6. The spraying device according to claim 5, characterized in that, The cross-sectional area of ​​the preliminary mixing chamber (13) gradually increases axially forward; and / or, The diameter of the coagulant outlet (21) is greater than or equal to 1 mm and less than or equal to 5 mm.

7. The spraying device according to claim 1, characterized in that, The coagulant outlet (21) is located on the axial front end face of the feed core (2), and the injection device further includes: A slotted plug (61) is placed in the preliminary mixing chamber (13) and blocks the coagulant outlet (21) at its axial rear end. A support assembly, axially position adjustable, is disposed on the wall of the feed cylinder (1) and located axially in front of the slotted plug (61); and The elastic element (62) abuts between the slotted plug (61) and the support assembly; The support assembly changes the initial compression of the elastic element (62) by connecting it to different axial positions of the feed cylinder (1).

8. The spraying device according to claim 7, characterized in that, The support components include: Adjusting the transition piece (63), which is threadedly connected to the wall of the feed cylinder (1); and The support base (64) abuts between the adjusting transition member (63) and the elastic member (62).

9. The spraying device according to claim 7, characterized in that, The slotted plug (61) has a sealing element on its sealing surface.

10. The spraying device according to any one of claims 1 to 9, characterized in that, The injection device further includes a mixing pipe (3) disposed axially in front of the feed cylinder (1), the cavity of the mixing pipe (3) comprising: The mixing chamber (31) is connected to the preliminary mixing chamber (13). The mixing chamber (31) is provided with a mixing assembly (32) arranged along the axial direction. The multiple mixing assemblies (32) include at least one of SK type positive and negative spiral blades, standard SY type mixer blades, SD type mixer blades, baffles and baffles.

11. The spraying device according to claim 10, characterized in that, The lumen of the mixing tube (3) further includes: The rectifier cavity (33) is located in front of the stirring and mixing cavity (31) and is connected to the stirring and mixing cavity (31). The rectifier cavity (33) is provided with a rectifier assembly (34), which forms multiple rectifier channels arranged parallel to each other along the axial direction.

12. The spraying device according to claim 11, characterized in that, The rectifier assembly (34) includes a plurality of circumferentially spaced flat blades with the blade surfaces extending along the discharge direction of the rectifier cavity (33); and / or, The rectifier assembly (34) includes multiple straight cylindrical components with interconnected cylindrical walls.

13. The spraying device according to claim 12, characterized in that, The rectifier assembly (34) extends axially rearward with a central shaft (35), which is connected to the stirring and mixing assembly (32).

14. The spraying device according to claim 11, characterized in that, The spraying device also includes: The nozzle (4) is connected to the axial front end of the mixing pipe (3) and has an internal spray chamber (41). The spray chamber (41) is connected to the rectifier chamber (33). The axial front end of the spray chamber (41) has a spray port (42) and is constricted along the spray direction.

15. The spraying device according to claim 10, characterized in that, The spraying device also includes: A switching valve (5) is connected between the mixing pipe (3) and the feed cylinder (1). The switching valve (5) is provided with a switching valve transition chamber (51) and a valve core (52). The switching valve transition chamber (51) is connected between the stirring mixing chamber (31) and the preliminary mixing chamber (13). The valve core (52) is located between the switching valve transition chamber (51) and the preliminary mixing chamber (13) and can connect or disconnect the switching valve transition chamber (51) and the preliminary mixing chamber (13).

16. A fire rescue device, characterized in that, Includes the spraying device according to any one of claims 1 to 15.

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