Foam nozzle for tunnel

Abstract

The invention relates to the technical field of fire-fighting sprayers, in particular to a foam sprayer for a tunnel, which structurally comprises a sprayer body, a main water splashing disc and an auxiliary water splashing disc, the main water splashing disc and the auxiliary water splashing disc are fixed at the front end of the sprayer body, a hollow cavity is arranged in the sprayer body, and the main water splashing disc and the auxiliary water splashing disc are combined with a flow guide core. Foam water flows along the first flow guide plate, the second flow guide plate and the flow guide teeth after being sprayed out through the first flow dividing hole and the second flow dividing hole of the spray head body, so that far-medium-short-distance all-directional covering spraying is achieved, the foam spray head is simpler in structure and easy to machine, in addition, the spray head is easy and convenient to install, and the production cost is reduced. During installation, the spray head only needs to be vertically and upwards installed according to the visual inspection indication mark, an angle tool is not needed, the installation efficiency is remarkably improved, the operation complexity is reduced, the spraying effect and the coverage range are guaranteed, and the reliability and the maintenance convenience of the whole system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of fire sprinkler nozzles, in particular to a foam sprinkler nozzle used in a tunnel. Background Art

[0002] When a fire occurs in a tunnel or other tall space, the fire-fighting device immediately responds and operates, spraying foam through the foam nozzles in the tunnel or other tall space to extinguish the fire. The foam is atomized and evenly spread to the fire area, forming an effective covering film that can isolate the fire source from the air and reduce the oxygen supply, thereby achieving the purpose of quickly suppressing the flame and reducing the temperature; The patent document with the publication number of CN217448793U discloses a foam nozzle for tunnel firefighting, including a body, a lower nozzle, a middle nozzle, and an upper nozzle. An inner cavity is formed in the body, and a first threaded hole is formed at one end of the body in communication with the inner cavity. A fan-shaped flange is provided on the outer side of the body for mounting 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 in communication with the inner cavity. A second arc transition is provided at the connection between the two ends of the fan-shaped flange and the outer wall of the body. In the process of practical application, the following deficiencies still exist: At present, the foam nozzles in tunnels and other tall spaces usually adopt the method of drilling 2 to 4 holes on the nozzle body, or installing water mist nozzles or side spray nozzles of different calibers and shapes by casting and welding several joints to achieve full coverage of long, medium and short spraying. However, this design makes the nozzle structure more complicated and bulky, which increases the difficulty of manufacturing; in addition, due to the different angle requirements of each processing hole, the accuracy and cost of controlling the angle are high, which makes the production and assembly process of the nozzle more challenging, especially in the process of nozzle assembly, the installation angle of each nozzle is difficult to fully meet the design standards, and the entire nozzle often needs to be adjusted during installation. For example, the angle is usually guided to be 30 degrees or other angles. The difficulty of angle adjustment is large, the error is high, and the coverage effect and fire extinguishing efficiency of the foam nozzle may be affected in the end. At the same time, the key components such as the guide plate and the splash plate in the existing design are often exposed during transportation, which are easily collided and damaged, thereby affecting the service life and performance of the nozzle. Summary of the invention

[0003] The present invention provides a foam spray head for tunnels, which can effectively solve the above problems.

[0004] The present invention is achieved in that: A foam nozzle for a tunnel, the structure of which includes: a nozzle body, a main splash plate and a secondary splash plate fixed to the front end of the nozzle body, a hollow cavity is arranged in the nozzle body, a pipe interface connected to the hollow cavity is arranged at the rear end of the nozzle body, a first diversion hole and a second diversion hole are arranged at the front end of the nozzle body, the first diversion hole and the second diversion hole are arranged up and down, the main splash plate includes a first guide plate corresponding to the first diversion hole, the first guide plate is inclined upward along the injection direction, and first fixing frames extending downward and parallel to the end face of the nozzle body are respectively provided on both sides of the front end, and also includes a first connecting frame connected between the bottoms of the two first fixing frames. A connecting plate, a guide core is installed on the side facing the nozzle body in the middle of the first connecting plate, and the guide core is arranged corresponding to the second diversion hole. A trough guide structure is provided in the middle of one end of the first guide plate extending horizontally in the injection direction, and the trough guide structure spreads outward in a triangular shape along the injection direction. A plurality of guide teeth in a circular array along the central axis of the guide core are provided at the bottom of the first connecting plate, and the guide teeth extend in an arc shape toward the nozzle body; the auxiliary splash plate includes two second fixed frames correspondingly installed in front of the first fixed frame, and a second connecting plate connected to the middle of the two second fixed frames, and a second guide plate inclined upward along the injection direction is provided at the bottom of the second connecting plate.

[0005] As a further improvement, a first screw is provided on the side of the guide core facing the first connecting plate, the first connecting plate has a first mounting hole for the first screw to pass through, and a hexagonal nut matching the first screw is provided in front of the first connecting plate.

[0006] As a further improvement, the guide core is a truncated cone structure, and the guide core is coaxially arranged with the second diversion hole, and the diameter of the guide core gradually increases along the injection direction.

[0007] As a further improvement, a first protrusion extending upward is provided in the middle of the top of the first connecting plate, and second protrusions extending upward are provided on the left and right sides of the top of the first connecting plate respectively, and a first guide groove is formed between the first protrusion, the second protrusion and the first fixed frame.

[0008] As a further improvement, a third protrusion extending upward is provided in the middle of the top of the second connecting plate, and a second guide groove is formed between the second fixing frame and the third protrusion.

[0009] As a further improvement, the first fixed frame is connected to the nozzle body by a connecting rod, and the connecting rod is provided with a first external thread on the end facing the nozzle body, and the nozzle body is provided with a first bolt hole matching the first external thread; the first fixed frame and the second fixed frame are connected by a locking bolt, and the first fixed frame and the second fixed frame are respectively provided with a second mounting hole and a third mounting hole for the locking bolt to pass through, and the connecting rod is provided with an internal thread matching the locking bolt toward the first fixed frame.

[0010] As a further improvement, it also 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, and the protective cover is coaxially arranged with the nozzle body.

[0011] 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 a limiting rib extending along the axial direction, and the nozzle body is provided with a sliding groove corresponding to the limiting rib; the inner wall of the protective cover also has a locking portion arranged radially, and the nozzle body is provided with a snap-fitting groove corresponding to the locking portion.

[0012] As a further improvement, the left and right ends of the first guide plate facing the nozzle body are respectively provided with positioning protrusions, and the end surface of the nozzle body is provided with limiting holes corresponding to the positioning protrusions.

[0013] As a further improvement, the third protrusion is provided with a fourth mounting hole for the first screw to pass through.

[0014] The beneficial effects of the present invention are: The main splash plate and the auxiliary splash plate of the present invention are combined with the guide core. 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 guide plate, the second guide plate and the guide teeth, thereby realizing 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. In addition, the installation process of the nozzle is simple. During installation, the nozzle only needs to be installed vertically upward according to the visual indication mark without the aid of angle tools, 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

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a foam nozzle for use in a tunnel provided by the present invention; Figure 2 It is a schematic diagram of the three-dimensional assembly structure of the foam spray head provided by the present invention; Figure 3 is a half-section schematic diagram of the foam spray head provided by the present invention; Figure 4 It is a structural schematic diagram of the auxiliary splash plate provided by the present invention; Figure 5 It is a half-section schematic diagram of the auxiliary splash plate provided by the present invention; Figure 6 It is a structural schematic diagram of the main splash plate provided by the present invention; Figure 7 It is a structural schematic diagram of the main splash plate provided by the present invention from the right side; Figure 8 It is a schematic diagram of the structure of the nozzle body provided by the present invention from the front view; Fig. 9 It is a schematic diagram of the structure of the nozzle body provided by the present invention from the rear view; Fig.10 It is a three-dimensional structural schematic diagram of the foam spray head provided by the present invention; Fig.11 It is a structural schematic diagram of the foam spray head provided by the present invention in a front view; Fig.12 is a cross-sectional schematic diagram of the protective cover provided by the present invention; Fig.13 It is a half-section schematic diagram of a foam nozzle with double flow-guiding cores provided by the present invention; Fig.14 It is a schematic diagram of the front view structure of the auxiliary splash plate of the double-flow guide core foam nozzle provided by the present invention; Fig.15 It is a schematic diagram of installing the guide core of the double guide core foam nozzle provided by the present invention.

[0017] Figure: nozzle body-1, main splash plate-2, auxiliary 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, guide core-4, trough guide structure-24, guide tooth-25, second fixing frame-31, second connecting plate-32, second guide plate-33, first screw-41, first installation Hole-26, hexagonal nut-42, first protrusion-27, second protrusion-28, third protrusion-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, slide groove-16, locking part-73, snap-fit ​​groove-17, positioning protrusion-210, limiting hole-18, fourth mounting hole-36. DETAILED DESCRIPTION

[0018] In order to make the embodiments of the present invention, all belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0019] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as referring to the purpose, technical solutions and advantages of the methods. To be more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work indicate or imply relative importance or implicitly indicate the number of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0020] At present, foam nozzles in large spaces such as tunnels usually adopt the method of drilling 2 to 4 holes on the nozzle body, or installing water mist nozzles or side spray nozzles of different calibers and shapes by casting or welding several joints to achieve full coverage of long, medium and short spraying. However, this design makes the nozzle structure more complicated and bulky, which increases the difficulty of manufacturing; in addition, since the angle requirements of each processing hole are different, the accuracy and cost of controlling the angle are high, which makes the production and assembly process of the nozzle more challenging, especially in the process of nozzle assembly, the installation angle of each nozzle is difficult to fully meet the design standards, and the entire nozzle often needs to be adjusted during installation. For example, the usual guiding angle is 30 degrees or other angles. The difficulty of angle adjustment is large and the error is high, which may eventually affect the coverage effect and fire extinguishing efficiency of the foam nozzle. In order to solve the above technical problems, this case proposes the following technical solutions: Reference Figure 1 to Figure 15 As shown, a foam nozzle for tunnels, the structure of which includes: a nozzle body 1, a main splash plate 2 and a secondary splash plate 3 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 inclined upward along the injection direction, and first fixing frames 22 extending downward and parallel to the end face of the nozzle body 1 are respectively provided on both sides of the front end, and also includes a first connecting frame connected between the bottoms of the two first fixing frames 22 A connecting plate 23, a guide core 4 is installed on the side of the middle of the first connecting plate 23 facing the nozzle body 1, and the guide core 4 is arranged corresponding to the second diversion hole 14. A trough guide structure 24 is provided at the middle of one end of the first guide plate 21 extending horizontally in the injection direction, and the trough guide structure 24 spreads outward in a triangular shape along the injection direction. A plurality of guide teeth 25 are arranged in a circular array along the central axis of the guide core 4 at the bottom of the first connecting plate 23, and the guide teeth 25 extend toward the nozzle body 1 in an arc shape; the auxiliary splash plate 3 includes 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, and a second guide plate 33 inclined upward along the injection direction is provided at the bottom of the second connecting plate 32; Among them, the pipe interface 12 is provided with an internal thread connected to the fire water supply pipe, so as to facilitate the quick disassembly and assembly of the nozzle body 1 and the water supply pipe, which not only improves the installation efficiency, but also facilitates maintenance and replacement; The first guide plate 21 and the second guide plate 33 are both rectangular structures, so that the sprayed foam water is guided by the two guide plates and spreads in a fan shape of nearly 180 degrees, effectively increasing the width of the spray coverage area, thereby significantly improving the overall spraying effect of the foam nozzle and covering a wider area; At the same time, the angle between the first guide plate 21 and the first fixed frame 22 is 75° to 85°, and the angle between the second guide plate 33 and the second fixed frame 31 is 75° to 85°, so that the foam water flow can accurately cover the medium and long distance areas after the nozzle is started; An upward indicating arrow is also provided on the front surface of the second fixing frame 31, which provides an intuitive reference mark for the installation of the foam nozzle, so that during the installation process, there is no need to rely on additional angle tools or complicated measurement steps. The installer can quickly and accurately adjust the installation angle of the nozzle to ensure that the nozzle is installed in the correct direction, avoiding unsatisfactory spraying effect caused by inaccurate angles, which not only improves the installation efficiency, but also reduces human operation errors, ensuring the performance and fire extinguishing effect of the nozzle; Therefore, during the installation process, first connect the pipe interface 12 of the nozzle body 1 to the fire water supply pipe to ensure that the two are tightly connected. When a fire occurs in a tunnel or other tall space, 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 outward through the first diversion hole 13 and the second diversion hole 14. The foam water sprayed out of the first diversion hole 13 is first separated into two jets by the first guide plate 21, one of which rises upward along the upper surface of the first guide plate 21, and the other flows along the lower surface of the first guide plate 21. Combined with the trough guide structure 24 of the front section of the first guide plate 21 and the collision with the second connecting plate 32 on the auxiliary splash plate 3, the range of the jet is extended, and the spray coverage becomes wider, thereby effectively covering the medium and long distance areas; At the same time, the foam water sprayed from the second diversion hole 14 is sprayed on the guide core 4 to form a scattered flow, and a part of the jet is guided along the surface of the guide tooth 25, so as to achieve coverage of the close-range area, and the guide tooth 25 is provided with a plurality of and arranged in a circular array along the central axis of the guide core 4, ensuring the width and uniformity of the spray coverage area; another part of the jet flows along the guide core 4 to the gap between the guide teeth 25 to achieve precise coverage of the close-range area, and another part of the jet is guided along the top of the guide core 4 toward the bottom of the second guide plate 33 of the auxiliary splash plate 3, ensuring that the foam water passes through the second guide plate 33 to ensure that the foam water flows through the second guide plate 33. The plate 33 effectively sprays to the middle distance area, thereby realizing 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. The first diversion hole 13 and the second diversion hole 14 are all 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 installed vertically upward according to the visual indication mark without the aid of angle tools, 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.

[0021] To facilitate the installation, maintenance and replacement of the guide core 4, the guide core 4 is fixed to the first connecting plate 23 in a detachable installation manner. Specifically, a first screw 41 is provided on the side of the guide core 4 facing the first connecting plate 23, and the first connecting plate 23 has a first mounting hole 26 for the first screw 41 to pass through. A hexagonal nut 42 matching the first screw 41 is provided in front of the first connecting plate 23. During installation, the first screw 41 of the guide core 4 is passed through the first mounting hole 26 from the rear of the first connecting plate 23, and then the hexagonal nut 42 is securely locked by screwing it, so that it can be quickly disassembled and replaced when needed, thereby greatly improving maintenance efficiency and convenience and reducing maintenance costs.

[0022] The guide core 4 is a truncated cone structure, and the guide core 4 is coaxially arranged with the second diverter hole 14. The diameter of the guide core 4 gradually increases along the injection direction, thereby forming a gradually expanding flow channel, effectively optimizing the flow characteristics of the fluid, reducing the flow resistance and improving the diverter efficiency of the fluid, and being able to better guide the foam water to be evenly distributed to various areas, thereby achieving a more accurate and stable injection effect; Fig.13 , 15 As shown, the guide core 4 can also be a triangular cone. As the injection direction advances, the gradual expansion of the flow channel can effectively optimize the injection angle and coverage of the foam water, ensuring that the coverage area is more uniform and extensive.

[0023] Furthermore, a first protrusion 27 extending upward is provided in the middle of the top of the first connecting plate 23, and second protrusions 28 extending upward are provided on the left and right sides of the top of the first connecting plate 23, respectively. A first guide groove is formed between the first protrusion 27, the second protrusion 28 and the first fixed frame 22. The first protrusion 27 and the second protrusion 28 are both rectangular structures, and arc chamfers are provided on the top to optimize the transition of fluid flow, wherein the width of the first protrusion 27 is greater than the width of the second protrusion 28, thereby causing the foam water sprayed from the second diversion hole 14 to be separated into four torrents through the first guide groove between the first protrusion 27, the second protrusion 28 and the first fixed frame 22, thereby further expanding the width of the coverage while ensuring the range.

[0024] At the same time, a third protrusion 34 extending upward 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 protrusion 34. The third protrusion 34 is a rectangular structure, and an arc chamfer is provided on the top to optimize the transition of fluid flow. Therefore, after the foam water of the first diversion hole 13 is sprayed out, it is separated into multiple rapids along the gap between the downwardly protruding trough guide structure 24 and the third protrusion 34 and the second guide groove, which further expands the width of the coverage while ensuring the range.

[0025] The main splash plate 2 and the auxiliary splash plate 3 are fixed to the front end of the nozzle body 1 in a detachable installation manner. Specifically, the first fixing frame 22 is connected to the nozzle body 1 by a connecting rod 5, and the end of the connecting rod 5 facing the nozzle body 1 is provided with a first external thread, and 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 by a locking bolt 6, and 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, and the connecting rod 5 faces the first fixing frame 22 and the second fixing frame 31. A fixing frame 22 is provided with an internal thread that cooperates with the locking bolt 6. During installation, the first external thread of the connecting rod 5 is first screwed into the first bolt hole 15, and then the first fixing frame 22 and the second fixing frame 31 are closely fixed in sequence, and the second mounting hole 29 and the third mounting hole 35 are aligned. The locking bolt 6 is connected to the internal thread of the connecting rod 5 through the second mounting hole 29 and the third mounting hole 35 to ensure that the structure is stable and reliable, and convenient for disassembly and maintenance; in addition, the first fixing frame 22 and the auxiliary splash plate 3 are combined and assembled with the second fixing frame 31 to further enhance the structural strength.

[0026] In order to prevent the guide plate, splash plate and other key components from being damaged by external force collision during transportation and installation, thereby ensuring the service life and performance of the sprinkler, a protective cover 7 is also included outside the main splash plate 2 and the auxiliary splash plate 3. The protective cover 7 is a hollow bottomless cylindrical structure, and the bottom is socketed with the sprinkler body 1. The protective cover 7 is coaxially arranged with the sprinkler body 1 to ensure that the main splash plate 2, the auxiliary splash plate 3 and other components can avoid accidental damage such as collision and falling during the entire process from leaving the factory to completion of installation. At the same time, an upward indicator arrow is also provided on the front end face of the protective cover. During installation, the sprinkler only needs to be installed vertically upward according to the visual indicator mark, without the aid of angle tools, which significantly improves the installation efficiency and reduces the complexity of operation.

[0027] 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 is arranged upward, so during installation, it is only necessary to level the horizontal reference surface 71 without the aid of an angle tool, which significantly improves the installation efficiency and reduces the complexity of the operation, thereby simplifying the installation process; The inner wall of the protective cover 7 is provided with a limiting rib 72 extending in the axial direction, the nozzle body 1 is provided with a slide 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 snap-fitting groove 17 corresponding to the locking portion 73. During assembly, it is only necessary to insert the limiting rib 72 of the protective cover 7 along the slide groove 16 to ensure that it is correctly positioned, and at the same time, the locking portion 73 is accurately snapped with the snap-fitting groove 17 to ensure that the protective cover is firmly and stably fixed to the nozzle body 1, thereby ensuring that the horizontal reference surface of the protective cover 7 and the indicator arrow are always horizontally upward.

[0028] The left and right ends of the first guide plate 21 facing the nozzle body 1 are respectively provided with positioning protrusions 210, and the end face of the nozzle body 1 is provided with a limiting hole 18 corresponding to the positioning protrusion 210. Then, during assembly, the positioning protrusion 210 of the first guide plate 21 is correspondingly inserted into the limiting hole 18 to ensure that the first guide plate 21 is accurately docked with the nozzle body 1 during the installation process, so as to achieve rapid and accurate positioning of the first guide plate 21 and the nozzle body 1, reduce assembly errors, and avoid displacement of the first guide plate 21, which not only simplifies the installation operation, but also ensures the reliability and stability of the foam nozzle in long-term use.

[0029] like Fig.14 As shown, the third protrusion 34 is provided with a fourth mounting hole 36 for the first screw rod 41 to pass through, and the fourth mounting hole 36 is arranged corresponding to the first diversion hole 13, so as to facilitate the installation of a second guide core in the fourth mounting hole 36 to guide the foam water sprayed from the first diversion hole 13, thereby forming different spraying ranges and coverage areas, so as to enable the foam nozzle to adapt to different usage scenarios.

[0030] At the same time, the outer surface of the nozzle body 1 is also formed with a hexagonal structure that cooperates with a wrench, which is convenient for operation using a wrench during the installation process.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A foam nozzle for a tunnel, the structure of which comprises: A nozzle body (1), 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 also includes a first connecting plate (23) connected between the bottoms of the two first fixing frames (22), A guide core (4) is installed on one side of the middle of the first connecting plate (23) facing the nozzle body (1), and the guide core (4) is arranged corresponding to the second diversion hole (14). A trough guide structure (24) is provided in the middle of one end of the first guide plate (21) extending horizontally in the injection direction, and the trough guide structure (24) spreads outward in a triangular shape along the injection direction. A plurality of guide teeth (25) arranged in a circular array along the central axis of the guide core (4) are provided at the bottom of the first connecting plate (23), and the guide teeth (25) extend 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), and a second guide plate (33) inclined upward along the injection direction is provided at the bottom of the second connecting plate (32).

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: 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, the bottom of which is sleeved with the nozzle body (1), and the protective cover (7) and the nozzle body (1) are coaxially arranged.

8. A foam nozzle for tunnels as claimed in claim 7, characterized in that: 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).

9. 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).

10. 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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