A foam spray head for a tunnel

Abstract

The present invention relates to the technical field of fire sprinklers, and particularly to a foam sprinkler for tunnels. Its structure includes: a sprinkler body, a main splash plate and a secondary splash plate fixed to the front end of the sprinkler body. A hollow cavity is provided inside the sprinkler body. In the present invention, the main splash plate, the secondary splash plate and the diversion core are combined. After the foam water is sprayed out through the first diversion hole and the second diversion hole of the sprinkler body, it flows along the first diversion plate, the second diversion plate and the diversion teeth, so as to achieve all-round coverage spraying at far, medium and near distances. The foam sprinkler of the present invention has a simpler structure and is easier to process. In addition, the installation process of the sprinkler is simple. During installation, the sprinkler only needs to be vertically installed upward according to the visual indication mark without the aid of an angle tool, which significantly improves the installation efficiency and reduces the operation complexity. This foam sprinkler not only ensures the spraying effect and coverage range, but also improves the reliability and maintenance convenience of the overall system.

Description

Technical Field

[0001] The present invention relates to the technical field of fire sprinklers, and in particular, to a foam sprinkler for tunnels. Background Art

[0002] When a fire breaks out in a tunnel or other large space, the fire-fighting device immediately responds and operates, spraying foam through the foam sprinklers in the tunnel or other large space to carry out fire-fighting operations. The foam is atomized and evenly diffused into the fire area, and then forms an effective covering film, which can cut off the fire source from the air, reduce the oxygen supply, and thus achieve the purpose of quickly suppressing the flame and reducing the temperature.

[0003] In the patent document with the publication number: CN217448793U, a foam sprinkler for tunnel fire protection is disclosed, which includes a main body, a lower nozzle, a middle nozzle, and an upper nozzle. An inner cavity is provided in the main body, a first threaded hole is opened at one end of the main body and communicated with the inner cavity, a fan-shaped flange is provided on the outer side of the main body for installing and fixing the lower nozzle, the middle nozzle, and the upper nozzle, and the lower nozzle, the middle nozzle, and the upper nozzle are all communicated with the inner cavity. Second arc transitions are provided at the joints of both ends of the fan-shaped flange and the outer wall of the main body.

[0004] However, it still has the following deficiencies in the actual application process: At present, the foam sprinklers for tunnels and other large spaces usually drill 2 - 4 holes on the sprinkler body, or install water mist nozzles or side spray water nozzles with different diameters and shapes by casting or welding several joints to achieve full coverage of far, medium, and near spraying. However, this design makes the structure of the sprinkler more complex and bulky, increasing the manufacturing difficulty. In addition, due to different angle requirements for each processing hole, the accuracy and cost of controlling the angle are relatively high, which poses great challenges to the production and assembly process of the sprinkler. Especially during the assembly process of the sprinkler, it is difficult to fully meet the design standards for the installation angle of each nozzle, and the entire sprinkler often needs to be adjusted in angle during installation. For example, the guiding angle is usually 30 degrees or other included angles, and the angle adjustment is difficult with a high error, which may ultimately affect the coverage effect and fire-fighting efficiency of the foam sprinkler. At the same time, key components such as the deflector and the splash plate in the existing design are often exposed during transportation, vulnerable to collision and damage, thus affecting the service life and performance of the sprinkler. Summary of the Invention

[0005] The present invention provides a foam sprinkler for tunnels, which can effectively solve the above problems.

[0006] The present invention is realized as follows:

[0007] A foam sprinkler for a tunnel, the structure of which includes: a sprinkler body, a main splash plate and a secondary splash plate fixed to the front end of the sprinkler body. A hollow cavity is provided inside the sprinkler body. A pipe interface communicating with the hollow cavity is provided at the rear end of the sprinkler body. A first diversion hole and a second diversion hole are provided at the front end of the sprinkler body. The first diversion hole and the second diversion hole are arranged vertically. The main splash plate includes a first diversion plate correspondingly arranged at the first diversion hole. The first diversion plate is inclined upward along the spraying direction, and first fixing frames extending downward and parallel to the end face of the sprinkler body are respectively provided on both sides of the front end. It also includes a first connecting plate connected between the bottoms of the two first fixing frames. A diversion core is installed on one side of the middle of the first connecting plate facing the sprinkler body. The diversion core is correspondingly arranged with the second diversion hole. A wave trough diversion structure is provided in the middle of the end of the first diversion plate extending horizontally along the spraying direction. The wave trough diversion structure diffuses outward in a triangular shape along the spraying direction. A number of diversion teeth are provided at the bottom of the first connecting plate and are arranged in a circumferential array along the central axis of the diversion core. The diversion teeth extend toward the sprinkler body in an arc shape. The secondary splash plate includes two second fixing frames correspondingly installed in front of the first fixing frames, and a second connecting plate connected to the middle of the two second fixing frames. A second diversion plate inclined upward along the spraying direction is provided at the bottom of the second connecting plate.

[0008] As a further improvement, a first screw is provided on one side of the diversion core facing the first connecting plate. The first connecting plate has a first mounting hole for the first screw to pass through. A hexagonal nut cooperating with the first screw is provided in front of the first connecting plate.

[0009] As a further improvement, the diversion core is of a frustum structure, and the diversion core is coaxially arranged with the second diversion hole. The diameter of the diversion core gradually increases along the spraying direction.

[0010] As a further improvement, a first convex portion extending upward is provided in the middle of the top of the first connecting plate. Second convex portions extending upward are respectively provided on the left and right sides of the top of the first connecting plate. A first diversion groove is formed among the first convex portion, the second convex portion and the first fixing frame.

[0011] As a further improvement, a third convex portion extending upward is provided in the middle of the top of the second connecting plate. A second diversion groove is formed between the second fixing frame and the third convex portion.

[0012] As a further improvement, the first fixing frame and the nozzle body are connected by a connecting rod. One end of the connecting rod facing the nozzle body is provided with a first external thread, and the nozzle body is provided with a first bolt hole matching the first external thread. The first fixing frame and the second fixing frame are connected by a locking bolt. The first fixing frame and the second fixing frame are respectively provided with a second installation hole and a third installation hole for the locking bolt to pass through. The connecting rod facing the first fixing frame is provided with an internal thread matching the locking bolt.

[0013] As a further improvement, it further includes a protective cover arranged outside the main splash plate and the auxiliary splash plate. The protective cover is a hollow bottomless cylindrical structure, and the bottom is sleeved with the nozzle body. The protective cover is coaxially arranged with the nozzle body.

[0014] As a further improvement, a horizontal reference surface is formed at one end of the protective cover away from the nozzle body, and the horizontal reference surface is arranged upward. The inner wall of the protective cover is provided with limiting rib strips extending along the axial direction, and the outer wall of the nozzle body is provided with a chute corresponding to and cooperating with the limiting rib strips. The inner wall of the protective cover also has a locking portion arranged along the radial direction, and the outer wall of the nozzle body is provided with a buckling groove corresponding to and cooperating with the locking portion.

[0015] As a further improvement, positioning convex blocks are respectively arranged at the left and right ends of one side of the first deflector plate facing the nozzle body, and the end face of the nozzle body is provided with limiting holes corresponding to and cooperating with the positioning convex blocks.

[0016] As a further improvement, a fourth installation hole for the first screw rod to pass through is provided on the third convex portion.

[0017] The beneficial effects of the present invention are as follows:

[0018] The main splash plate, the auxiliary splash plate and the diversion core of the present invention are combined. After the foam water is sprayed out through the first diversion hole and the second diversion hole of the nozzle body, it flows along the first deflector plate, the second deflector plate and the diversion teeth, so as to realize all-round coverage spraying at far, medium and near distances. The foam nozzle of the present invention has a simpler structure and is easier to process. In addition, the installation process of the nozzle is simple. During installation, the nozzle only needs to be vertically installed upward according to the visual indication mark, without the aid of an angle tool, which significantly improves the installation efficiency and reduces the complexity of the operation. The foam nozzle not only ensures the spraying effect and coverage range, but also improves the reliability and maintenance convenience of the overall system. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of a foam spray head for a tunnel provided by the present invention;

[0021] Figure 2 It is a schematic three-dimensional assembly structure diagram of the foam spray head provided by the present invention;

[0022] Figure 3 It is a schematic semi-sectional view of the foam spray head provided by the present invention;

[0023] Figure 4 It is a schematic structural diagram of the auxiliary splash plate provided by the present invention;

[0024] Figure 5 It is a schematic semi-sectional view of the auxiliary splash plate provided by the present invention;

[0025] Figure 6 It is a schematic structural diagram of the main splash plate provided by the present invention;

[0026] Figure 7 It is a schematic structural diagram of the right view of the main splash plate provided by the present invention;

[0027] Figure 8 It is a schematic front view structural diagram of the spray head body provided by the present invention;

[0028] Figure 9 It is a schematic rear view structural diagram of the spray head body provided by the present invention;

[0029] Figure 10 It is a schematic three-dimensional structure diagram of the foam spray head provided by the present invention;

[0030] Figure 11 It is a schematic front view structural diagram of the foam spray head provided by the present invention;

[0031] Figure 12 It is a schematic sectional view of the protective cover provided by the present invention;

[0032] Figure 13 It is a schematic semi-sectional view of the foam spray head with a double flow guide core provided by the present invention;

[0033] Figure 14 It is a schematic front view structural diagram of the auxiliary splash plate of the double flow guide core foam spray head provided by the present invention;

[0034] Figure 15 It is a schematic installation diagram of the flow guide core of the double flow guide core foam spray head provided by the present invention.

[0035] In the figure: spray head body - 1, main splash plate - 2, secondary splash plate - 3, hollow cavity - 11, pipe interface - 12, first diversion hole - 13, second diversion hole - 14, first guide plate - 21, first fixing frame - 22, first connecting plate - 23, diversion core - 4, trough diversion structure - 24, diversion teeth - 25, second fixing frame - 31, second connecting plate - 32, second guide plate - 33, first screw - 41, first mounting hole - 26, hexagon nut - 42, first convex part - 27, second convex part - 28, third convex part - 34, connecting rod - 5, first bolt hole - 15, locking bolt - 6, second mounting hole - 29, third mounting hole - 35, protective cover - 7, horizontal reference plane - 71, limiting rib - 72, chute - 16, locking part - 73, buckling groove - 17, positioning convex block - 210, limiting hole - 18, fourth mounting hole - 36. Detailed implementation mode

[0036] To make the implementation modes of the present invention clear, the technical solutions in the implementation modes of the present invention will be clearly and completely described below with reference to the accompanying drawings in the implementation modes of the present invention. Obviously, the described implementation modes are part of the implementation modes of the present invention, rather than all of them. All other implementation modes obtained by those of ordinary skill in the art based on the implementation modes of the present invention without creative efforts belong to the scope of protection of the present invention.

[0037] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0038] At present, foam sprinklers in tall spaces such as tunnels usually drill 2 to 4 holes in the sprinkler body, or install water mist nozzles or side spray water nozzles of different calibers and shapes by casting or welding several joints to achieve full coverage of far, medium, and near spraying. However, this design makes the sprinkler structure relatively complex and bulky, increasing the manufacturing difficulty. In addition, due to different angle requirements for each processing hole, the accuracy and cost of controlling the angle are relatively high, which poses great challenges to the production and assembly process of the sprinkler. Especially during the sprinkler assembly process, it is difficult for the installation angle of each nozzle to fully meet the design standards, and the entire sprinkler often needs to be adjusted in angle during installation. For example, the usually guided angle is 30 degrees or other included angles, and the angle adjustment is difficult with a high error, which may ultimately affect the coverage effect and fire extinguishing efficiency of the foam sprinkler. To solve the above technical problems, the following technical solutions are proposed in this case:

[0039] Referring to Figures 1 to 15 As shown, a foam sprinkler for a tunnel includes: a sprinkler body 1, a main splash plate 2 and a secondary splash plate 3 fixed to the front end of the sprinkler body 1. A hollow cavity 11 is provided in the sprinkler body 1. A pipe interface 12 communicating with the hollow cavity 11 is provided at the rear end of the sprinkler body 1. A first diversion hole 13 and a second diversion hole 14 are provided at the front end of the sprinkler body 1. The first diversion hole 13 and the second diversion hole 14 are arranged vertically. The main splash plate 2 includes a first guide plate 21 corresponding to the first diversion hole 13. The first guide plate 21 is inclined upward along the spraying direction, and first fixing frames 22 extending downward and parallel to the end face of the sprinkler body 1 are respectively provided on both sides of the front end. It further includes a first connecting plate 23 connected between the bottoms of the two first fixing frames 22. A diversion core 4 is installed on one side of the middle of the first connecting plate 23 facing the sprinkler body 1. The diversion core 4 corresponds to the second diversion hole 14. A trough diversion structure 24 is provided in the middle of the end of the first guide plate 21 extending horizontally along the spraying direction. The trough diversion structure 24 diffuses outward in a triangular shape along the spraying direction. A number of diversion teeth 25 arranged in a circumferential array along the central axis of the diversion core 4 are provided at the bottom of the first connecting plate 23. The diversion teeth 25 extend toward the sprinkler body 1 in an arc shape. The secondary splash plate 3 includes two second fixing frames 31 correspondingly installed in front of the first fixing frames 22, and a second connecting plate 32 connected to the middle of the two second fixing frames 31. A second guide plate 33 inclined upward along the spraying direction is provided at the bottom of the second connecting plate 32;

[0040] Among them, an internal thread for connecting with a fire water supply pipe is provided in the pipe interface 12, which facilitates the quick disassembly and assembly of the sprinkler body 1 and the water supply pipe, not only improving the installation efficiency but also facilitating maintenance and replacement;

[0041] Both the first deflector 21 and the second deflector 33 are rectangular structures, enabling the sprayed foam water to spread in a nearly 180-degree fan shape under the guidance of the two deflectors, effectively increasing the width of the spray coverage area, thus significantly enhancing the overall spraying effect of the foam nozzle and achieving a more extensive coverage area;

[0042] At the same time, the angle between the first deflector 21 and the first fixing frame 22 is 75° - 85°, and the angle between the second deflector 33 and the second fixing frame 31 is 75° - 85°, enabling the foam water flow to accurately cover medium- and long-distance areas after the nozzle is activated;

[0043] There is also an upward indicating arrow on the front surface of the second fixing frame 31, providing an intuitive reference mark for the installation of the foam nozzle. During the installation process, there is no need to rely on additional angle tools or complex measurement steps. Installers can quickly and accurately adjust the installation angle of the nozzle, ensuring that the nozzle is installed in the correct direction, avoiding unsatisfactory spraying effects caused by inaccurate angles, not only improving the installation efficiency but also reducing human operation errors and ensuring the service performance and fire extinguishing effect of the nozzle;

[0044] Therefore, during the installation process, first connect the pipe interface 12 of the nozzle body 1 to the fire water supply pipe to ensure a tight connection between the two. When a fire occurs in a tunnel or other large spaces, the pressurized water and foam mixture enter the hollow cavity 11 of the nozzle body 1 through the fire water supply pipe and are sprayed out through the first diversion hole 13 and the second diversion hole 14. The foam water sprayed out from the first diversion hole 13 is first separated into two jets by the first deflector 21. One jet rises upward along the upper surface of the first deflector 21, and the other jet flows along the lower surface of the first deflector 21. Combining with the trough diversion structure 24 at the front section of the first deflector 21 and the impact with the second connecting plate 32 on the auxiliary splash plate 3, the jet range is extended, and the spraying coverage area becomes wider, thus effectively covering medium- and long-distance areas;

[0045] Meanwhile, the foam water ejected from the second diversion hole 14 sprays towards the diversion core 4 to form a scattered flow. A part of the jet flows along the surface of the diversion teeth 25 for diversion, thereby achieving coverage of the short-distance area. There are multiple diversion teeth 25 and they are circumferentially arrayed along the central axis of the diversion core 4, ensuring the width and uniformity of the spray coverage area. Another part of the jet flows along the diversion core 4 into the gap between the diversion teeth 25 to achieve precise coverage of the medium and short-distance areas. Still another part of the jet is guided along the top of the diversion core 4 towards the bottom of the second diversion plate 33 of the auxiliary splash plate 3, ensuring that the foam water is effectively sprayed to the medium-distance area through the second diversion plate 33, thereby achieving all-round coverage spraying at long, medium, and short distances. The foam nozzle of the present invention has a simpler structure and is easy to process. Moreover, the first diversion hole 13 and the second diversion hole 14 are on the same axis, and the angle and straightness are easy to control during processing. In addition, the installation process of the nozzle is simple. During installation, the nozzle only needs to be vertically installed upward according to the visual indication mark without the aid of an angle tool, significantly improving the installation efficiency and reducing the complexity of the operation. This foam nozzle not only ensures the spraying effect and coverage range but also improves the reliability and maintenance convenience of the overall system.

[0046] To facilitate the installation, maintenance, and replacement of the diversion core 4, the diversion core 4 is fixed to the first connection plate 23 in a detachable installation manner. Specifically, a first screw 41 is provided on one side of the diversion core 4 facing the first connection plate 23. The first connection plate 23 has a first installation hole 26 for the first screw 41 to pass through. A hexagonal nut 42 cooperating with the first screw 41 is provided in front of the first connection plate 23. During installation, the first screw 41 of the diversion core 4 is passed through the first installation hole 26 from the rear of the first connection plate 23, and then it is firmly locked by screwing the hexagonal nut 42, which is convenient for quick disassembly and replacement when needed, thereby greatly improving the maintenance efficiency and convenience and reducing the maintenance cost.

[0047] The diversion core 4 has a frustum structure, and the diversion core 4 is coaxially arranged with the second diversion hole 14. The diameter of the diversion core 4 gradually increases along the jetting direction, thereby forming a gradually expanding flow channel, effectively optimizing the flow characteristics of the fluid, reducing the flow resistance, and improving the fluid diversion efficiency, and being able to better guide the foam water to be evenly distributed to each area, thereby achieving a more precise and stable jetting effect. As Figure 13 、 15 shown, the diversion core 4 can also adopt a triangular pyramid. As the jetting direction advances, the gradual expansion of the flow channel can effectively optimize the jetting angle and coverage area of the foam water, ensuring that the coverage area is more uniform and extensive.

[0048] Furthermore, a first convex portion 27 extending upward is provided in the middle of the top of the first connecting plate 23, and second convex portions 28 extending upward are respectively provided on the left and right sides of the top of the first connecting plate 23. A first diversion channel is formed among the first convex portion 27, the second convex portion 28, and the first fixing frame 22. Both the first convex portion 27 and the second convex portion 28 are rectangular structures, and an arc chamfer is provided at the top to optimize the transition of fluid flow. Among them, the width of the first convex portion 27 is greater than the width of the second convex portion 28, so that the foam water ejected from the second diversion hole 14 is separated into four jets by the first diversion channel among the first convex portion 27, the second convex portion 28, and the first fixing frame 22, while ensuring the range, further expanding the width of the coverage area.

[0049] Meanwhile, a third convex portion 34 extending upward is provided in the middle of the top of the second connecting plate 32. A second diversion channel is formed between the second fixing frame 31 and the third convex portion 34. The third convex portion 34 is a rectangular structure, and an arc chamfer is provided at the top to optimize the transition of fluid flow. Therefore, after the foam water from the first diversion hole 13 is ejected, it is separated into multiple jets along the gap between the downward convex trough diversion structure 24 and the third convex portion 34 and the second diversion channel, while ensuring the range, further expanding the width of the coverage area.

[0050] The main splash plate 2 and the auxiliary splash plate 3 are fixedly installed at the front end of the nozzle body 1 in a detachable manner. Specifically, the first fixing frame 22 and the nozzle body 1 are connected by a connecting rod 5. One end of the connecting rod 5 facing the nozzle body 1 is provided with a first external thread, and a first bolt hole 15 matching the first external thread is provided on the nozzle body 1; the first fixing frame 22 and the second fixing frame 31 are connected by a locking bolt 6. The first fixing frame 22 and the second fixing frame 31 are respectively provided with second installation holes 29 and third installation holes 35 for the locking bolt 6 to pass through. The connecting rod 5 is provided with an internal thread matching the locking bolt 6 facing the first fixing frame 22. During installation, first screw the first external thread of the connecting rod 5 with the first bolt hole 15, and then closely fix the first fixing frame 22 and the second fixing frame 31 in sequence, and the second installation holes 29 and the third installation holes 35 are arranged in alignment. The locking bolt 6 is connected to the internal thread of the connecting rod 5 through the second installation hole 29 and the third installation hole 35 to ensure the structural stability and reliability, and facilitate disassembly and maintenance; in addition, when the first fixing frame 22 and the second fixing frame 31 of the main splash plate 2 and the auxiliary splash plate 3 are assembled together, the structural strength can be further enhanced.

[0051] In order to prevent key components such as the deflector and splash plate from being damaged due to external force collision during transportation and installation, thereby ensuring the service life and performance of the nozzle, it further includes a protective cover 7 provided outside the main splash plate 2 and the secondary splash plate 3. The protective cover 7 is a hollow bottomless cylindrical structure, and its bottom is sleeved with the nozzle body 1. The protective cover 7 is coaxially arranged with the nozzle body 1, ensuring that components such as the main splash plate 2 and the secondary splash plate 3 can avoid accidental damage such as impact and drop during the entire process from factory to installation completion. At the same time, an upward indicating arrow is also provided on the front end face of the protective cover. During installation, the nozzle can be vertically installed upward only by visually observing the indicating mark, without the need to use an angle tool, significantly improving the installation efficiency and reducing the complexity of the operation.

[0052] Specifically, a horizontal reference surface 71 is formed at one end of the protective cover 7 away from the nozzle body 1, and the horizontal reference surface 71 faces upward. Therefore, during installation, it is only necessary to level the horizontal reference surface 71, without the need to use an angle tool, significantly improving the installation efficiency and reducing the complexity of the operation, and simplifying the installation process;

[0053] The inner wall of the protective cover 7 is provided with limiting rib strips 72 extending along the axial direction. The outer surface of the nozzle body 1 is provided with a chute 16 corresponding to and cooperating with the limiting rib strips 72. The inner wall of the protective cover 7 also has a locking portion 73 arranged along the radial direction. The outer surface of the nozzle body 1 is provided with a buckling groove 17 corresponding to and cooperating with the locking portion 73. During assembly, only the limiting rib strips 72 of the protective cover 7 need to be inserted along the chute 16 to ensure correct alignment, and at the same time, the locking portion 73 and the buckling groove 17 are accurately buckled, ensuring that the protective cover is firmly and stably fixed to the nozzle body 1, thereby ensuring that the horizontal reference surface and the indicating arrow of the protective cover 7 are always horizontally upward.

[0054] On the left and right ends of the side of the first deflector 21 facing the nozzle body 1, positioning protrusions 210 are respectively provided. The end face of the nozzle body 1 is provided with limiting holes 18 corresponding to and cooperating with the positioning protrusions 210. Further, during assembly, the positioning protrusions 210 of the first deflector 21 are correspondingly inserted into the limiting holes 18 to ensure that the first deflector 21 is accurately docked with the nozzle body 1 during installation, realizing rapid and accurate positioning of the first deflector 21 and the nozzle body 1, reducing assembly errors, and at the same time preventing the first deflector 21 from shifting. This not only simplifies the installation operation but also ensures the reliability and stability of the foam nozzle during long-term use.

[0055] As Figure 14 shown, a fourth installation hole 36 for the first screw 41 to pass through is provided on the third protrusion 34, and the fourth installation hole 36 is correspondingly arranged with the first diversion hole 13, facilitating the installation of a second diversion core in the fourth installation hole 36 to divert the foam water sprayed out from the first diversion hole 13, thereby forming different spraying ranges and coverage areas, enabling the foam nozzle to adapt to different usage scenarios.

[0056] Meanwhile, a hexagonal structure that mates with a wrench is also formed on the outer surface of the nozzle body 1, facilitating the use of a wrench during the installation process.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A foam nozzle for a tunnel, the structure of which comprises: A nozzle body (1) is characterized in that: a main splash plate (2) and a secondary splash plate (3) are fixed to the front end of the nozzle body (1); a hollow cavity (11) is provided in the nozzle body (1); a pipe interface (12) connected to the hollow cavity (11) is provided at the rear end of the nozzle body (1); a first diversion hole (13) and a second diversion hole (14) are provided at the front end of the nozzle body (1); the first diversion hole (13) and the second diversion hole (14) are arranged up and down; the main splash plate (2) includes a first guide plate (21) corresponding to the first diversion hole (13); the first guide plate (21) is arranged upwardly inclined along the injection direction; and first fixing frames (22) extending downwardly and parallel to the end face of the nozzle body (1) are respectively provided on both sides of the front end; and a first connecting plate (23) connected between the bottoms of the two first fixing frames (22); the middle of the first connecting plate (23) A flow guide core (4) is installed on one side facing the nozzle body (1), the flow guide core (4) is arranged corresponding to the second diversion hole (14), a trough flow guide structure (24) is provided at the middle of one end of the first flow guide plate (21) extending horizontally in the injection direction, the trough flow guide structure (24) spreads outward in a triangular shape along the injection direction, a plurality of flow guide teeth (25) arranged in a circular array along the central axis of the flow guide core (4) are provided at the bottom of the first connecting plate (23), the flow guide teeth (25) extending in an arc shape toward the nozzle body (1); the auxiliary splash plate (3) comprises two second fixed frames (31) correspondingly installed in front of the first fixed frame (22), and a second connecting plate (32) connected to the middle of the two second fixed frames (31), a second flow guide plate (33) inclined upward along the injection direction is provided at the bottom of the second connecting plate (32), and an upward indicating arrow is also provided on the front end surface of the second fixed frame (31); It also includes a protective cover (7) arranged outside the main splash plate (2) and the auxiliary splash plate (3), the protective cover (7) being a hollow bottomless cylindrical structure, and the bottom of which is sleeved with the nozzle body (1), and the protective cover (7) and the nozzle body (1) are coaxially arranged; at the same time, an upward indicating arrow is also arranged on the front end surface of the protective cover (7); A horizontal reference surface (71) is formed at one end of the protective cover (7) away from the nozzle body (1), and the horizontal reference surface (71) is arranged upward; the inner wall of the protective cover (7) is provided with a limiting rib (72) extending in the axial direction, and the nozzle body (1) is provided with a sliding groove (16) corresponding to the limiting rib (72); the inner wall of the protective cover (7) also has a locking portion (73) arranged in the radial direction, and the nozzle body (1) is provided with a buckling groove (17) corresponding to the locking portion (73).

2. A foam nozzle for tunnels as claimed in claim 1, characterized in that: A first screw rod (41) is provided on a side of the guide core (4) facing the first connecting plate (23); the first connecting plate (23) has a first mounting hole (26) for the first screw rod (41) to pass through; and a hexagonal nut (42) matching the first screw rod (41) is provided in front of the first connecting plate (23).

3. A foam nozzle for tunnels as claimed in claim 2, characterized in that: The flow guide core (4) is a truncated cone structure, and the flow guide core (4) and the second flow diversion hole (14) are coaxially arranged, and the diameter of the flow guide core (4) gradually increases along the injection direction.

4. A foam nozzle for tunnels as claimed in claim 1, characterized in that: A first protruding portion (27) extending upwards is provided in the middle of the top of the first connecting plate (23), and second protruding portions (28) extending upwards are provided on the left and right sides of the top of the first connecting plate (23), respectively, and a first guide groove is formed between the first protruding portion (27), the second protruding portion (28) and the first fixing frame (22).

5. A foam nozzle for tunnels as claimed in claim 1, characterized in that: A third protruding portion (34) extending upwards is provided in the middle of the top of the second connecting plate (32), and a second guide groove is formed between the second fixing frame (31) and the third protruding portion (34).

6. A foam nozzle for tunnels according to any one of claims 1 to 5, characterized in that: The first fixing frame (22) and the nozzle body (1) are connected via a connecting rod (5); an end of the connecting rod (5) facing the nozzle body (1) is provided with a first external thread; the nozzle body (1) is provided with a first bolt hole (15) that cooperates with the first external thread; the first fixing frame (22) and the second fixing frame (31) are connected via a locking bolt (6); the first fixing frame (22) and the second fixing frame (31) are respectively provided with a second mounting hole (29) and a third mounting hole (35) for the locking bolt (6) to pass through; the connecting rod (5) facing the first fixing frame (22) is provided with an internal thread that cooperates with the locking bolt (6).

7. A foam nozzle for tunnels as claimed in claim 6, characterized in that: Positioning protrusions (210) are respectively provided at the left and right ends of the first guide plate (21) facing the nozzle body (1), and the end surface of the nozzle body (1) is provided with limiting holes (18) corresponding to the positioning protrusions (210).

8. A foam nozzle for tunnels as claimed in claim 5, characterized in that: The third protruding portion (34) is provided with a fourth mounting hole (36) for the first screw rod (41) to pass through.

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