Fire monitor with foam self-absorption adjustable function

Abstract

The invention discloses a fire monitor with a foam self-absorption adjustable function, and belongs to the technical field of fire-fighting equipment. Which comprises a cannon body which comprises a circular-truncated-cone-shaped pipe, a connecting pipe, a gap adjusting pipe and an injection pipe, and is characterized by further comprising a cannon core and a foam self-absorption adjustable mechanism, the cannon core is arranged in a cannon cavity in a longitudinal state, the upper end of the cannon core extends upwards to the upper portion of the gap adjusting pipe, and the lower end of the cannon core is connected with the upper end of the circular-truncated-cone-shaped pipe; and the foam self-absorption adjustable mechanism is connected with the cannon core and is communicated with an injection pipe cavity of the injection pipe through the cannon core or is connected with the lower side part of the injection pipe and is communicated with a foam gap channel which is formed between the outer wall of the gap channel adjusting pipe and the inner wall of the injection pipe and is communicated with the injection pipe cavity. The system has the advantages that the system is simplified, and space occupation is reduced; the balance between the foam supply quantity and the water flow can be adjusted as required; the ideal integration level and the working reliability of the fire monitor are embodied; and the problems of foam supply interruption and even proportion imbalance caused by water pressure containment are avoided.

Description

Technical Field

[0001] This invention belongs to the field of fire protection facilities technology, and specifically relates to a fire monitor with adjustable foam self-priming function. Background Technology

[0002] As is known in the industry, foam extinguishing agents are primarily, but not limited to, extinguishing Class B fires, such as fires involving flammable liquids. Their core function is to cover and suffocate. Specific fire extinguishing applications include: petrochemical industry facilities such as above-ground / underground oil tanks and depots; leak fires in refineries and chemical plants, such as cracking units, distillation towers, and reaction vessels; logistics sectors such as loading and unloading terminals, railway and highway tanker loading and unloading platforms; aviation and transportation sectors such as aircraft hangars, aircraft maintenance aprons, airport runways (for handling aviation fuel fires), large ship engine rooms, cargo oil tanks, and gas stations; warehouses and energy facilities such as warehouses storing various lubricating oils, paints, solvents, and other flammable liquids, diesel generator rooms in thermal power plants, and fuel-fired boilers; and special hazardous locations such as pharmaceutical factories and organic solvent storage areas, etc.

[0003] Foam is essentially a foaming agent (also known as a "surfactant") that greatly reduces the surface tension of water, making the mixture easier to foam and forming a relatively tough and durable foam film. Common types of foam include protein hydrolysates, fluorocarbon surfactants, and hydrocarbon surfactants. In addition, foam stabilizers such as polymers and metallic soaps (such as zinc soap) are also used. In short, the foam concentrate used varies depending on the nature of the fire.

[0004] Fixed foam extinguishing systems are currently the most common and prevalent configuration. This system typically includes a separate pressure-type foam proportioner installed on the outlet pipe of the fire pump. Its working principle is as follows: high-pressure water from the fire pump outlet flows through the venturi section of the mixer, creating negative pressure and mixing with the water flow. The mixed solution is then piped to the fire monitor for spraying. The disadvantages of this configuration are: system complexity and large space occupation, requiring a separate mixer, foam liquid storage tank, connecting pipes and valves, making installation cumbersome, especially inconvenient for integration with mobile firefighting equipment such as fire trucks and portable pumps; reliance on system pressure and location, the mixer's suction effect has strict requirements on the inlet water pressure, and the relative installation height of the mixer and foam liquid storage tank has a significant impact, resulting in poor design and installation flexibility, inconvenient adjustment, and difficulty in quickly adjusting the mixing ratio to adapt to different types of foam liquid or changes in fire conditions; non-integration and low reliability, making it difficult to coordinate well with fire monitors; limited functionality and weak adjustment capabilities, as the mixing ratio of most units is fixed or has a very limited adjustment range. The negative pressure intensity it generates directly depends on the water supply pressure, and it cannot actively adjust its liquid absorption capacity. When the water supply pressure is insufficient, liquid absorption is prone to interruption or imbalance. Therefore, it is of positive significance to explore a fire monitor device with a reasonable structure that can overcome the aforementioned shortcomings and requires the use of foam. The technical solution to be introduced below was developed in this context. Summary of the Invention

[0005] The objective of this invention is to provide a fire monitor with a self-priming adjustable foam function that helps simplify the system and reduce space occupation, facilitates the supply of foam and allows for flexible adjustment of the supply amount as needed, achieves ideal integration with the fire monitor and demonstrates operational reliability, and avoids foam supply interruption or even imbalance caused by water pressure due to its own good foam adjustment capability.

[0006] The objective of this invention is achieved by providing a fire monitor with adjustable foam self-priming function, comprising a monitor body, which includes a frustum-shaped tube, a connecting tube, a channel adjustment tube, and a spray tube connected sequentially from bottom to top. The monitor body is characterized by further including a core and a foam self-priming adjustment mechanism. The core is longitudinally disposed within the monitor body cavity, with its upper end extending upward to the upper part of the channel adjustment tube and its lower end connected to the upper end of the frustum-shaped tube. The foam self-priming adjustment mechanism is connected to the core and communicates with the spray tube cavity of the spray tube via the core, or is connected to the lower side of the spray tube and communicates with a foam channel formed between the outer wall of the channel adjustment tube and the inner wall of the spray tube, which also communicates with the spray tube cavity of the spray tube.

[0007] In a specific embodiment of the present invention, a disc-shaped core pressure head is extended at the upper end of the core, and a narrowing convex ring for the gap regulating tube is formed on the inner wall of the gap regulating tube and at a position corresponding to the lower part of the core pressure head, which bulges toward the center of the gap regulating tube cavity. The space between the narrowing convex ring for the gap regulating tube cavity and the core pressure head constitutes a pressure reduction and speed increase channel with reduced pressure and increased flow velocity.

[0008] In another specific embodiment of the present invention, the core is hollow, and a core cavity extending through the core in the longitudinal center is formed, penetrating the core's height direction. This core cavity passes through the core pressure head, and an adjusting cover plate is provided on the upper surface corresponding to the core pressure head. The space between the adjusting cover plate and the opposite side of the core pressure head forms a foam extraction channel for drawing out foam from the core cavity. This foam extraction channel communicates with the injection pipe cavity of the injection pipe. The foam in the injection pipe cavity interacts with water introduced by the positive pressure water supply pipe and sequentially passes through the frustum-shaped pipe, connecting pipe, and gap channel. Firefighting water introduced into the spray nozzle cavity through the pressure-reducing and speed-increasing channel is mixed and sprayed out from the spray nozzle cavity. A foam transition inlet pipe is connected to the lower end of the core and at the position corresponding to the upper end of the frustum-shaped tube. The foam transition inlet pipe communicates with the core cavity. The upper end of the foam transition inlet pipe is fixed to the lower end cavity wall of the connecting pipe cavity by a set of radially distributed foam transition inlet pipe fixing strips. The lower end extends to the outside of the positive pressure water supply pipe cavity. The foam self-priming adjustable mechanism is connected to and communicates with the lower end of the foam transition inlet pipe.

[0009] In another specific embodiment of the present invention, the foam self-priming adjustable mechanism includes a foam container, a foam self-priming pipe, a foam delivery pipe, a foam extraction volume adjustment control valve, and a foam transition outlet pipe connector. The foam container is installed on a foam fire truck or on the ground in the use state. One end of the foam self-priming pipe is introduced into the foam container, and the other end is connected to one end of the foam extraction volume adjustment control valve. The other end of the foam extraction volume adjustment control valve is connected to one end of the foam delivery pipe. The other end of the foam delivery pipe is connected to one end of the foam transition outlet pipe connector, and the other end of the foam transition outlet pipe connector is connected to the lower end of the foam transition inlet pipe.

[0010] In another specific embodiment of the present invention, a positive pressure water supply pipe connecting section is flanged at one end of the positive pressure water supply pipe facing the frustum-shaped pipe. A positive pressure water supply pipe connecting section flange is formed at one end of the positive pressure water supply pipe facing the frustum-shaped pipe. A lower frustum-shaped pipe connecting flange is formed at the lower end of the frustum-shaped pipe. The lower frustum-shaped pipe connecting flange and the positive pressure water supply pipe connecting section flange are flanged together. An upper frustum-shaped pipe connecting flange is formed at the upper end of the frustum-shaped pipe. The lower end of the connecting pipe has a connecting pipe flange, which is connected to the connecting flange on the frustum-shaped pipe. The upper end of the connecting pipe extends into the lower part of the gap regulating pipe cavity and forms a sliding pair with the cavity wall of the gap regulating pipe cavity. A nut is threaded on the outer wall of the lower end of the gap regulating pipe. The upper end of the gap regulating pipe extends into the lower part of the spray pipe cavity of the spray pipe and seals with the inner wall of the spray pipe cavity. The lower end of the foam transition inlet pipe extends outside the positive pressure water supply pipe connecting pipe section.

[0011] In another specific embodiment of the present invention, a connecting pipe upper sealing ring is embedded on the outer wall of the upper end of the connecting pipe, and a pair of connecting pipe middle sealing rings are embedded on the outer wall of the middle part of the connecting pipe. The connecting pipe upper sealing ring and the pair of connecting pipe middle sealing rings are sealed and fitted with the cavity wall of the gap adjustment tube of the gap adjustment tube; a gap adjustment tube sealing ring is embedded on the outer wall of the upper end of the gap adjustment tube, and the gap adjustment tube sealing ring is sealed and fitted with the cavity wall of the injection tube of the injection tube.

[0012] In a further specific embodiment of the present invention, a set of adjusting screws is provided on the adjusting cover plate and at intervals around the adjusting cover plate, and the set of adjusting screws is connected to the core pressure head.

[0013] In a further specific embodiment of the present invention, the foam extraction volume regulating control valve is a ball valve.

[0014] In yet another specific embodiment of the present invention, when the gap adjustment tube is adjusted downward, the pressure reduction and speed increase channel increases, and when the gap adjustment tube is adjusted upward, the pressure reduction and speed increase channel decreases.

[0015] In yet another specific embodiment of the present invention, the gun core is solid and its lower end is connected to a gun core support seat, which is fixed to the cavity wall of the connecting tube by a set of radially distributed gun core support seat fixing strips.

[0016] The technical advantages of the solution provided by this invention are as follows: Because an independent channel for introducing water and foam is formed within the fire monitor body, the water and foam mix within the spray nozzle cavity and are simultaneously drawn out from the spray port to supply the fire-fighting pipeline connected to the spray nozzle, thus simplifying the system and reducing space occupation; it allows for on-demand adjustment and balance between foam supply and water flow; because the positive pressure water supply pipe utilizes the Venturi principle to introduce foam from the self-priming adjustable foam mechanism into the spray nozzle cavity during the process of introducing pressurized water, it helps to reflect the ideal integration of the fire monitor and the reliability of its operation; because the self-priming adjustable foam mechanism can adjust the foam supply itself, it avoids the problem of foam supply interruption or even imbalance caused by water pressure constraints. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of part A; Figure 3 This is a schematic diagram of the second embodiment of the present invention; Figure 4 for Figure 2 Enlarged view of part B.

[0018] In the diagram: 1. Gun body; 11. Frustum-shaped tube; 111. Lower connecting flange of frustum-shaped tube; 112. Upper connecting flange of frustum-shaped tube; 1121. Sealing ring of upper connecting flange of frustum-shaped tube; 12. Connecting tube; 121. Connecting tube flange; 122. Sealing ring of upper connecting tube; 123. Sealing ring in the middle of connecting tube; 13. Gap channel adjusting tube; 131. Gap channel adjusting tube cavity; 132. Gap channel adjusting tube cavity reducing diameter protrusion; 1321. Pressure reducing and speed increasing channel; 133. Nut; 134. Sealing ring of gap channel adjusting tube; 14. Injection tube; 141. Injection tube cavity; 1411. Injection port; 2. Gun core; 21. Gun core pressure head; 211. Adjusting cover plate; 2111. Foam outlet channel; 2112. Adjusting screw; 22. Gun core cavity; 23. 1. Foam transition inlet pipe; 231. Foam transition inlet pipe fixing strip; 24. Gun core; 241. Gun core support fixing strip; 3. Foam self-priming adjustable mechanism; 31. Foam container; 32. Foam self-priming pipe; 33. Foam delivery pipe; 34. Foam extraction volume regulating control valve; 341. Adjusting handle; 35. Foam transition outlet pipe connector; 36. T-joint; 4. Positive pressure water supply pipe; 41. Positive pressure water supply pipe cavity; 42. Positive pressure water supply pipe connecting section; 421. Positive pressure water supply pipe connecting section flange; 5. Foam channel. Detailed Implementation

[0019] In order to better understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the present invention. Any formal but not substantive equivalent transformations made based on the concept of the present invention should be considered within the scope of the present invention.

[0020] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on the positional state shown in the figure being described, and therefore should not be construed as a special limitation on the technical solution provided by the present invention.

[0021] Example 1: Please refer to Figure 1 and Figure 2 The image shows a gun body 1, which includes a frustum-shaped tube 11, a connecting tube 12, a gap adjustment tube 13, and a jet tube 14 connected sequentially from bottom to top. The gun body 1 is characterized by the inclusion of a gun core 2 and a foam self-priming adjustable mechanism 3. The gun core 2 is arranged longitudinally in the gun body cavity of the gun body 1, and the upper end of the gun core 2 extends upward to the upper part of the aforementioned gap adjustment tube 13, while the lower end is connected to the upper end of the frustum-shaped tube 11. The aforementioned foam self-priming adjustable mechanism 3 is connected to the aforementioned gun core 2 and communicates with the jet tube cavity 141 of the jet tube 14 through the gun core 2.

[0022] A disc-shaped core pressure head 21 is extended at the upper end of the aforementioned core 2. On the inner wall of the aforementioned channel regulating tube 13 and at a position corresponding to the lower part of the core pressure head 21, a channel regulating tube cavity reducing diameter convex ring 132 is formed, which bulges toward the center direction of the channel regulating tube cavity 131 of the channel regulating tube 13. The space between the channel regulating tube cavity reducing diameter convex ring 132 and the core pressure head 21 is formed as a pressure reducing and flow rate increasing channel 1321.

[0023] In this embodiment, since the aforementioned core 2 is hollow, a core cavity 22 is formed at the longitudinal center of the core 2, extending through the height direction of the core 2. The core cavity 22 passes through the aforementioned core pressure head 21, and an adjustment cover plate 211 is provided on the upper surface corresponding to the core pressure head 21. The space between the adjustment cover plate 211 and the opposite side of the core pressure head 21 is configured as a foam outlet channel 2111 for drawing out the foam in the core cavity 22. The foam outlet channel 2111 communicates with the spray cavity 141 of the aforementioned spray pipe 14. The foam in the spray cavity 141 mixes with the fire water introduced by the positive pressure water supply pipe 4 and introduced into the spray cavity 141 in sequence through the aforementioned frustum-shaped pipe 11, connecting pipe 12, gap adjustment pipe 13 and pressure reducing and speed increasing channel 1321, and is sprayed out or drawn out from the spray port 1411 of the spray cavity 141 to supply the fire hose or similar pipeline connected to the spray pipe 14. A foam transition inlet pipe 23 is connected to the lower end of the core 2 and at the position corresponding to the upper end of the aforementioned frustum-shaped tube 11. The foam transition inlet pipe 23 communicates with the aforementioned core cavity 22. The upper end of the foam transition inlet pipe 23 is fixed to the lower end cavity wall of the connecting tube cavity of the connecting tube 12 by a set of radially distributed foam transition inlet pipe fixing strips 231. The lower end extends to the outside of the positive pressure water supply pipe cavity 41 of the positive pressure water supply pipe 4. The aforementioned foam self-priming adjustable mechanism 3 is connected to and communicates with the lower end of the aforementioned foam transition inlet pipe 23.

[0024] See you later Figure 1 And combined Figure 2 The aforementioned adjustable foam self-priming mechanism 3 includes a foam container 31, a foam self-priming pipe 32, a foam delivery pipe 33, a foam extraction rate regulating control valve 34, and a foam transition outlet pipe connector 35. The foam container 31 is mounted on a foam fire truck, supported on the ground, or on another similar support during use. One end of the foam self-priming pipe 32 is introduced into the foam container 31, and the other end is connected to one end of the foam extraction rate regulating control valve 34. The other end of the foam extraction rate regulating control valve 34 is connected to one end of the foam delivery pipe 33, and the other end of the foam delivery pipe 33 is connected to one end of the foam transition outlet pipe connector 35. The other end of the foam transition outlet pipe connector 35 is connected to the lower end of the aforementioned foam transition inlet pipe 23. Based on professional knowledge, a T-joint 36 (also called a T-shaped joint) is provided between the opposing ends of the foam self-priming pipe 32 and the foam delivery pipe 33 for connection to the aforementioned foam extraction rate regulating control valve 34.

[0025] Depend on Figure 1As shown, a positive pressure water supply pipe connecting section 42 is flanged at one end of the aforementioned positive pressure water supply pipe 4 facing the aforementioned frustum-shaped pipe 11. A positive pressure water supply pipe connecting section 42 with a flange 421 at one end facing the frustum-shaped pipe 11 is formed. A lower frustum-shaped pipe connecting flange 111 is formed at the lower end of the aforementioned frustum-shaped pipe 11. The lower frustum-shaped pipe connecting flange 111 and the positive pressure water supply pipe connecting section flange 421 are flanged together. An upper frustum-shaped pipe connecting flange 112 is formed at the upper end of the frustum-shaped pipe 11. A connecting flange 112 is formed at the lower end of the aforementioned connecting pipe 12. The connecting flange 121 is connected to the connecting flange 112 on the frustum-shaped pipe. The upper end of the connecting pipe 12 extends into the lower part of the aforementioned gap regulating cavity 131 of the aforementioned gap regulating pipe 13 and forms a sliding pair with the cavity wall of the gap regulating cavity 131. A nut 133 is threaded on the outer wall of the lower end of the aforementioned gap regulating pipe 13. The upper end of the gap regulating pipe 13 extends into the lower part of the spray cavity 141 of the aforementioned spray pipe 14 and seals with the inner wall of the spray cavity 141. The lower end of the aforementioned foam transition inlet pipe 23 extends to the outside of the positive pressure water supply pipe connecting section 42.

[0026] Please pay attention. Figure 2 A connecting pipe upper sealing ring 122 is embedded on the outer wall of the upper end of the aforementioned connecting pipe 12, and a pair of connecting pipe middle sealing rings 123 are embedded on the outer wall of the middle part of the connecting pipe 12. The connecting pipe upper sealing ring 122 and the pair of connecting pipe middle sealing rings 123 are sealed and fitted with the cavity wall of the cavity 131 of the aforementioned cavity adjustment pipe 13. A cavity adjustment pipe sealing ring 134 is embedded on the outer wall of the upper end of the aforementioned cavity adjustment pipe 13, and the cavity adjustment pipe sealing ring 134 is sealed and fitted with the cavity wall of the cavity 141 of the aforementioned injection pipe 14.

[0027] As a preferred embodiment, a frustum-shaped flange sealing ring 1121 is embedded on the upward-facing side of the aforementioned frustum-shaped flange 112, and the frustum-shaped flange sealing ring 1121 provides a good seal between the flange and the connecting pipe flange 121.

[0028] Depend on Figure 1 and Figure 2 As shown, a set of adjusting screws 2112 are provided on the aforementioned adjusting cover plate 211 and around the circumference of the adjusting cover plate 211. The set of adjusting screws 2112 is connected to the aforementioned core pressure head 21. By adjusting the set of adjusting screws 2112, the width of the foam outlet channel 2111 (also referred to as the "foam outlet gap") can be changed as needed.

[0029] In this embodiment, the aforementioned foam extraction volume regulating control valve 34 is a ball valve.

[0030] When the aforementioned gap adjustment tube 13 is adjusted downward, the aforementioned pressure reduction and speed increase channel 1321 increases, while when the gap adjustment tube 13 is adjusted upward, the aforementioned pressure reduction and speed increase channel 1321 decreases.

[0031] When the positive pressure water supply pipe 4 is in the water supply state, pressurized water sequentially enters the spray chamber 141 of the spray pipe 14 through the positive pressure water supply pipe connecting section 42, the frustum-shaped pipe 11 connecting pipe 12, and the gap regulating pipe 13, and is led from the spray port 1411 to the pipeline connected to the spray pipe 14, such as a pipe with a fire extinguishing gun (also called a fire extinguishing nozzle) at the end, to extinguish the fire. In the aforementioned process, using the Venturi principle, when the foam extraction amount regulating control valve 34 is in the open state, the foam in the foam container 31 sequentially enters the spray chamber 141 through the foam self-priming pipe 32, the foam delivery pipe 33, the foam extraction amount regulating control valve 34, the foam transition lead-out pipe connector 35, the foam transition lead-in pipe 23, the core cavity 22 of the core 2, and the pressure reducing and speed increasing channel 1321, mixes with the water supplied by the aforementioned water supply pipe 41, and is led out from the spray port 1411.

[0032] To clearly illustrate the essence of the invention, solid arrows in the diagram indicate the direction of water flow, while hollow arrows indicate the direction of foam flow. Under the premise that the water supply pressure of the positive pressure water supply pipe 4 remains essentially constant, the amount of foam can be controlled by firefighters adjusting the foam extraction volume regulating valve 34. Figure 1 The diagram also shows the adjusting handle 341 of the foam extraction volume regulating control valve 34.

[0033] Example 2: Please refer to Figure 3 and Figure 4 In this embodiment 2, the aforementioned core 2 is solid, and its lower end is connected to the core support 24. The core support 24 is fixed to the connecting cavity wall of the aforementioned connecting pipe 12 by a set of radially distributed core support fixing strips 241. Since the core 2 is solid, the aforementioned foam self-priming adjustable mechanism 3 is connected to the lower part of the aforementioned injection pipe 14 and communicates with the foam channel 5, which is formed between the outer wall of the channel adjustment pipe 13 and the inner wall of the injection pipe 14 and also communicates with the injection cavity 141 of the injection pipe 14. The rest is the same as described in embodiment 1.

[0034] In summary, the technical solution provided by this invention makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effects column.

Claims

1. A fire monitor with adjustable foam self-priming function, comprising a monitor body (1), the monitor body (1) comprising a frustum-shaped tube (11), a connecting tube (12), a gap adjustment tube (13), and a spray tube (14) arranged sequentially from bottom to top, characterized in that: It also includes a core (2) and a foam self-priming adjustable mechanism (3). The core (2) is arranged longitudinally in the gun body cavity of the gun body (1), and the upper end of the core (2) extends upward to the upper part of the channel adjustment tube (13), while the lower end is connected to the upper end of the frustum-shaped tube (11). The foam self-priming adjustable mechanism (3) is connected to the core (2) and communicates with the injection cavity (141) of the injection tube (14) through the core (2) or is connected to the lower part of the injection tube (14) and communicates with the foam channel (5) formed between the outer wall of the channel adjustment tube (13) and the inner wall of the injection tube (14), which also communicates with the injection cavity (141) of the injection tube (14).

2. The fire monitor with adjustable foam self-priming function according to claim 1, characterized in that: A disc-shaped core pressure head (21) is extended at the upper end of the core (2), and a narrowing convex ring (132) is formed on the inner wall of the gap regulating tube (13) and at a position corresponding to the lower part of the core pressure head (21), which bulges toward the center of the gap regulating tube cavity (131) of the gap regulating tube (13). The space between the narrowing convex ring (132) and the core pressure head (21) forms a pressure reduction and speed increase channel (1321) with reduced pressure and increased flow rate.

3. The fire monitor with adjustable foam self-priming function according to claim 2, characterized in that: The core (2) is hollow, and a core cavity (22) is formed at the longitudinal center of the core (2) in the height direction of the core (2). The core cavity (22) passes through the core pressure head (21), and an adjustment cover plate (211) is provided on the upper surface corresponding to the core pressure head (21). The space between the adjustment cover plate (211) and the opposite side of the core pressure head (21) forms a foam extraction channel (2111) for extracting foam from the core cavity (22). The foam extraction channel (2111) communicates with the injection pipe cavity (141) of the injection pipe (14). The foam in the injection pipe cavity (141) is introduced by the positive pressure water supply pipe (4) and passes through the frustum-shaped pipe (11), the connecting pipe (12), and the gap adjustment pipe (13) in sequence. 3) The fire water introduced into the spray pipe cavity (141) by the pressure reduction and speed increase channel (1321) is mixed and sprayed out from the spray port (1411) of the spray pipe cavity (141). A foam transition inlet pipe (23) is connected to the lower end of the core (2) and at the position corresponding to the upper end of the frustum-shaped pipe (11). The foam transition inlet pipe (23) is connected to the core cavity (22). The upper end of the foam transition inlet pipe (23) is fixed to the lower end cavity wall of the connecting pipe cavity of the connecting pipe (12) by a set of radially distributed foam transition inlet pipe fixing strips (231). The lower end extends to the outside of the positive pressure water supply pipe cavity (41) of the positive pressure water supply pipe (4). The foam self-priming adjustable mechanism (3) is connected to and communicates with the lower end of the foam transition inlet pipe (23).

4. The fire monitor with adjustable foam self-priming function according to claim 3, characterized in that: The foam self-priming adjustable mechanism (3) includes a foam container (31), a foam self-priming pipe (32), a foam delivery pipe (33), a foam extraction volume adjustment control valve (34), and a foam transition outlet pipe connector (35). The foam container (31) is installed on a foam fire truck or on the ground in the use state. One end of the foam self-priming pipe (32) is introduced into the foam container (31), and the other end is connected to one end of the foam extraction volume adjustment control valve (34). The other end of the foam extraction volume adjustment control valve (34) is connected to one end of the foam delivery pipe (33). The other end of the foam delivery pipe (33) is connected to one end of the foam transition outlet pipe connector (35), and the other end of the foam transition outlet pipe connector (35) is connected to the lower end of the foam transition inlet pipe (23).

5. The fire monitor with adjustable foam self-priming function according to claim 3, characterized in that: The positive pressure water supply pipe (4) is flanged to a positive pressure water supply pipe connecting section (42) at one end facing the frustum-shaped pipe (11). A positive pressure water supply pipe connecting section flange (421) is formed at the end of the positive pressure water supply pipe connecting section (42) facing the frustum-shaped pipe (11). A frustum-shaped pipe lower connecting flange (111) is formed at the lower end of the frustum-shaped pipe (111). The frustum-shaped pipe lower connecting flange (111) and the positive pressure water supply pipe connecting section flange (421) are flanged together. A frustum-shaped pipe upper connecting flange (112) is formed at the upper end of the frustum-shaped pipe (11). A connecting pipe is formed at the lower end of the connecting pipe (12). Flange (121), the connecting pipe flange (121) is connected to the connecting flange (112) on the frustum-shaped pipe. The upper end of the connecting pipe (12) extends into the lower part of the gap regulating pipe cavity (131) of the gap regulating pipe (13) and forms a sliding pair with the cavity wall of the gap regulating pipe cavity (131). A nut (133) is threaded on the outer wall of the lower end of the gap regulating pipe (13). The upper end of the gap regulating pipe (13) extends into the lower part of the spray pipe cavity (141) of the spray pipe (14) and seals with the inner wall of the spray pipe cavity (141). The lower end of the foam transition inlet pipe (23) extends to the outside of the positive pressure water supply pipe connecting pipe section (42).

6. The fire monitor with adjustable foam self-priming function according to claim 5, characterized in that: A connecting pipe upper sealing ring (122) is embedded on the outer wall of the upper end of the connecting pipe (12), and a pair of connecting pipe middle sealing rings (123) are embedded on the outer wall of the middle part of the connecting pipe (12). The connecting pipe upper sealing ring (122) and the pair of connecting pipe middle sealing rings (123) are sealed and fitted with the cavity wall of the gap adjustment tube cavity (131) of the gap adjustment tube (13). A gap adjustment tube sealing ring (134) is embedded on the outer wall of the upper end of the gap adjustment tube (13), and the gap adjustment tube sealing ring (134) is sealed and fitted with the cavity wall of the injection tube cavity (141) of the injection tube (14).

7. The fire monitor with adjustable foam self-priming function according to claim 3, characterized in that: A set of adjusting screws (2112) is provided on the adjusting cover plate (211) and around the adjusting cover plate (211) at intervals. The set of adjusting screws (2112) is connected to the core pressure head (21).

8. The fire monitor with adjustable foam self-priming function according to claim 4, characterized in that: The foam extraction volume regulating control valve (34) is a ball valve.

9. The fire monitor with adjustable foam self-priming function according to claim 3, characterized in that: When the gap adjustment tube (13) is adjusted downward, the pressure reduction and speed increase channel (1321) increases, while when the gap adjustment tube (13) is adjusted upward, the pressure reduction and speed increase channel (1321) decreases.

10. The fire monitor with adjustable foam self-priming function according to claim 2, characterized in that: The core (2) is solid and its lower end is connected to the core support (24), which is fixed to the cavity wall of the connecting tube (12) by a set of radially distributed core support fixing strips (241).

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