Hybrid jet fire monitor with backwater structure and application thereof

Abstract

This invention relates to a mixed jet fire monitor with a return water structure and its application. The fire monitor includes a main body and a powder pipe, a return pipe, and a flow stabilizer placed inside the main body. The flow stabilizer is connected to the inner wall of the main body, the return pipe passes through the flow stabilizer and its outlet extends out of the main body, and the powder pipe is placed inside the return pipe with one end passing through the return pipe and extending out of the main body. This invention provides a water-proof space with a return pipe inside the fire monitor body, preventing the outer high-pressure annular water flow from immediately contacting the central powder extinguishing agent. Furthermore, the splashed droplets from the annular water flow fall into the water-proof space and are discharged through the return pipe outlet, preventing water accumulation inside the mixed jet fire monitor. The return pipe extends to the bend at the end of the powder pipe, and the outlet of the return pipe is symmetrically arranged with the inlet of the powder pipe. A ball head is provided at the end of the return pipe, significantly reducing local resistance at the bend of the powder pipe and making the water velocity distribution within the main body more uniform.

Description

Technical Field

[0001] This invention relates to a mixed jet fire monitor with a water return structure and its application, and particularly to a fire monitor using superabsorbent polymer as the extinguishing mixture, belonging to the field of fire equipment technology. Background Technology

[0002] Currently, mixed jet fire extinguishing technology has been practically applied and has achieved good fire extinguishing results. Mixed jet fire extinguishing technology mixes and sprays multiple extinguishing agents, overcoming the shortcomings of traditional pure water fire extinguishing, such as the difficulty of water staying on the surface of burning materials and low fire extinguishing efficiency due to the high fluidity of water. It can give full play to the fire extinguishing performance advantages of each extinguishing agent and make up for their individual shortcomings.

[0003] The extinguishing agents used in mixed jet fire suppression technology on the market are mainly dry powder extinguishing agents and water-based extinguishing agents. Dry powder extinguishing agents have high extinguishing efficiency, but their residues cause serious environmental pollution. Water-based extinguishing agents have a long range and low cost, but their extinguishing efficiency is relatively low. To overcome the shortcomings of dry powder extinguishing agents, current research applies superabsorbent polymers (SAPs) to the fire protection field. SAPs offer multiple properties such as flame retardancy, heat insulation, and environmental friendliness. They can combine with different matrices to form gels, utilizing their flame retardant and heat insulation properties to achieve good fire extinguishing effects.

[0004] However, when superabsorbent polymers (SAPs) mix with water, they form a gel. Traditional mixed-jet water cannons use SAPs as the extinguishing agent, which leads to the SAPs mixing with water at the nozzle to form a gel that clogs the nozzle and affects normal firefighting operations. Therefore, developing a fire cannon that can fire mixed-jet water including SAPs as the extinguishing agent has become a key research focus in the industry.

[0005] A search revealed that Chinese patent CN207722267U discloses a fire nozzle with an adjustable mixing ratio of water and ultrafine dry powder extinguishing agent. The nozzle has a nozzle at the front and independent powder inlet and water inlet pipes at the rear, with the powder inlet pipe fitted inside the water inlet pipe. Patent CN105148435A discloses a multifunctional coaxial fire nozzle device, including an outer shaft pipe inlet interface connecting to an external pipeline for conveying the extinguishing agent, and an inner shaft pipe inlet interface connecting to an internal pipeline for conveying the extinguishing agent. These two independent fire nozzle devices are cleverly combined into one unit, allowing simultaneous spraying of two extinguishing agents of the same or different properties, or the same properties but different functions, to the fire scene. Patent CN109806532A discloses a composite jet fire extinguishing device, including a first connecting pipe for conveying foam or water-based extinguishing agent, with a first discharge port at one end; a second connecting pipe for conveying nitrogen-driven dry powder, with a second discharge port at one end, the second discharge port being concentrically arranged with the first discharge port; an outer spray pipe, one end connected to the first discharge port; and an inner spray pipe located inside the outer spray pipe and coaxially arranged with it, one end of the inner spray pipe penetrating the first connecting pipe for conveying nitrogen-driven dry powder, with a channel for conveying foam or water-based extinguishing agent provided between the outer wall of the inner spray pipe and the inner wall of the first discharge port. However, the above patent mainly targets dry powder extinguishing agents, and clogging may occur when spraying superabsorbent polymer (SAP) extinguishing agents.

[0006] Patent CN211752076U provides a fire-fighting device with an extended powder nozzle, including a water nozzle and a powder nozzle. The water nozzle is arranged around the outside of the powder nozzle, and the powder nozzle's spray port is located in front of the water nozzle's spray port. The powder nozzle includes a detachable extension tube at the front. Although this patent provides a water-proof zone between the water nozzle and the powder nozzle tube wall, and extends the powder tube to prevent the superabsorbent polymer from mixing with water too early to form a gel and block the nozzle, the water-proof zone is prone to water accumulation, and the proposed method of adding a drain outlet for drainage is difficult to implement. Furthermore, the powder tube obstruction leads to uneven water flow velocity distribution within the water cannon channel, affecting the extinguishing agent spraying effect. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a hybrid jet fire monitor capable of continuously spraying superabsorbent polymer (SAP) extinguishing agents into the fire scene without clogging the nozzle. A space is designed between the water channel and the powder pipe that serves both as a water barrier and drainage system, effectively preventing gel blockage caused by water splashing and improving the situation where the water barrier is filled with water, thus affecting normal use. Furthermore, a special flow stabilizer is installed inside the fire monitor to improve the uneven distribution of water flow velocity within the water channel, thereby enhancing the spraying effect of the extinguishing agent.

[0008] The present invention also provides a method for using the above-mentioned mixed jet fire monitor with a return water structure.

[0009] The technical solution of the present invention is as follows:

[0010] A mixed jet fire monitor with a return water structure includes a main body and a powder pipe, a return pipe and a flow stabilizer placed inside the main body;

[0011] The flow stabilizer is connected to the inner wall of the main body, the return pipe passes through the flow stabilizer and the outlet of the return pipe extends out of the main body, and the powder pipe is placed inside the return pipe and one end passes through the return pipe and extends out of the main body.

[0012] Preferably, the main body is a hollow structure, comprising a front fire monitor wall, a middle fire monitor wall, and a rear fire monitor wall connected in sequence.

[0013] Preferably, the end of the front fire monitor wall is connected to a quick-release threaded joint.

[0014] Preferably, the flow stabilizer is welded to the wall of the fire monitor.

[0015] Preferably, the flow stabilizer is a hollow annular body with multiple blades. The advantage of this design is that the flow stabilizer can support and stabilize the return pipe. Water flows out from the gaps between the blades on the annular body to form a hollow water column. With the help of the strong outward leakage force of the water column, the fire-fighting medium sprayed from the powder pipe can be carried out and mixed with the outside of the water cannon, avoiding blockage of the cannon nozzle.

[0016] Preferably, the annular body has a total of 12 blades arranged front to back, with 6 blades evenly distributed at the front end and 6 blades evenly distributed at the rear end, and the 6 blades at the front end and 6 blades at the rear end are arranged alternately.

[0017] Preferably, the outlet of the reflux pipe and the inlet of the powder pipe are symmetrically arranged.

[0018] Preferably, the tail end of the return pipe is provided with a return pipe ball head, which is located behind the return pipe outlet. The advantage of this design is that after the return water enters the return pipe, it flows out from the return pipe outlet, and the return pipe ball head at the tail end can form a water vortex, which discharges the fire-fighting medium mixed in the return water from the return pipe outlet, thus preventing the fire-fighting medium from accumulating in the return pipe.

[0019] Preferably, the ball head of the return tube is threadedly connected to the tail end of the return tube.

[0020] Preferably, the front end of the powder tube is provided with an extension tube that extends out of the main body.

[0021] Preferably, the extension tube is threadedly connected to the front end of the powder tube.

[0022] A fire truck comprising a mixed jet fire monitor with a return water structure as described above.

[0023] A method for operating a mixed jet fire monitor with a return water structure includes the following steps:

[0024] 1) Connect the fire monitor to the water supply pipe on the fire equipment, connect the powder pipe to the container containing superabsorbent polymer, and connect the return pipe to the empty container.

[0025] 2) Start the fire-fighting equipment; water and superabsorbent polymer are pumped into the main body and powder pipe respectively.

[0026] 3) After the high-pressure water jet is ejected, it forms a hollow water column of a certain length. After the superabsorbent polymer is ejected, it gradually mixes with the water jet inside the hollow water column and becomes one with it, forming a mixed fire extinguishing medium.

[0027] 4) Part of the water flow from the main body port passes through the return pipe, and at the same time, the residual superabsorbent polymer powder from the main body port is flushed into the return pipe. Finally, the water is discharged from the fire monitor through the return pipe and enters the empty container.

[0028] Technical features and beneficial effects of the present invention:

[0029] 1. The present invention has a water-proof space with a return pipe inside the fire monitor body, so that the high-pressure annular water flow on the outside will not immediately come into contact with the powder extinguishing agent in the middle, and the liquid droplets splashed by the annular water flow will fall into the water-proof space and be discharged through the outlet of the return pipe, so that there will be no water accumulation inside the mixed jet fire monitor.

[0030] 2. In this invention, the tail end of the fire monitor return pipe is extended to the bend at the end of the powder pipe. The outlet of the return pipe and the inlet of the powder pipe are symmetrically arranged, and a ball head is provided at the tail end of the return pipe, which significantly reduces the local resistance at the bend of the powder pipe and makes the water flow velocity distribution in the body more uniform.

[0031] 3. The return pipe outlet of this invention is designed with threads, which can also be connected to a compressed air source, so that the water-proof space continuously outputs annular compressed air to prevent the droplets of external annular high-pressure water flow from entering the powder pipe. It can also play a water-proof role. In specific use, users can choose different usage methods of the drain pipe according to their own needs.

[0032] 4. The present invention designs a flow stabilizer with a special structure between the return pipe and the inner wall of the main body, which significantly improves the uneven distribution of water flow velocity between the main body and the return pipe, improves the jetting effect of the mixed jet water cannon, and the flow stabilizer can also support the return pipe. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the fire monitor of the present invention;

[0034] Figure 2 This is a cross-sectional view of the fire monitor of the present invention;

[0035] Figure 3 This is a schematic diagram A of the fire monitor of the present invention;

[0036] Figure 4 This is a schematic diagram (B) of the fire monitor of the present invention;

[0037] Figure 5 This is a schematic diagram (C) of the fire monitor of the present invention;

[0038] Figure 6 This is a schematic diagram (D) of the fire monitor of the present invention;

[0039] Figure 7 This is a schematic diagram of the current stabilizer.

[0040] Figure 8 for Figure 7 Cross-sectional view of the medium current stabilizer along the AA direction;

[0041] In the diagram: 1-Threaded connector, 2-Front fire monitor wall, 3-Return pipe ball head, 4-Return pipe outlet, 5-Return pipe tail, 6-Powder pipe, 7-Flow stabilizer, 701-Front end blade, 702-Rear end blade, 8-Middle fire monitor wall, 9-Rear fire monitor wall, 10-Extension pipe. Detailed Implementation

[0042] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto.

[0043] Example 1:

[0044] like Figure 4 , 5 As shown in Figures 7 and 8, this embodiment provides a mixed jet fire monitor with a return water structure, including a main body and a powder pipe 6, a return pipe and a flow stabilizer 7 placed inside the main body;

[0045] The flow stabilizer 7 is connected to the inner wall of the main body, the return pipe passes through the flow stabilizer 7 and the return pipe outlet 4 extends out of the main body, and the powder pipe 6 is placed inside the return pipe and one end passes through the return pipe and extends out of the main body.

[0046] Specifically, the main body is a hollow structure, and the material can be cast iron or steel. It includes a front fire monitor wall 2, a middle fire monitor wall 8 and a rear fire monitor wall 9 connected in sequence. The three parts are connected to each other as a whole.

[0047] The flow stabilizer 7 is welded to the central fire monitor wall 8. Furthermore, to reduce the overall weight of the mixed jet fire monitor and decrease the risk of leakage, all components are connected by welding. The flow stabilizer 7 is a hollow annular body with 12 blades. Six blades 701 are evenly distributed at the front end and six blades 702 are evenly distributed at the rear end, with the blades symmetrically arranged. The front and rear blades are spaced apart. The flow stabilizer 7 supports and stabilizes the return pipe. Water flows out from the gaps between the blades on the annular body, forming a hollow water column. The strong outward force of this water column carries the fire-fighting medium sprayed from the powder pipe outward and mixes it with the outside of the fire monitor, preventing blockage of the nozzle. The outlet 4 of the return pipe and the inlet of the powder pipe 6 are symmetrically arranged along the axis of the main body.

[0048] The tail end 5 of the return pipe is equipped with a return pipe ball head 3, which is located behind the return pipe outlet 4. After the return water enters the return pipe, it flows out from the return pipe outlet 4. The return pipe ball head 3 at the tail end can form a water vortex, which discharges the fire-fighting medium mixed in the return water from the return pipe outlet 4, thus preventing the fire-fighting medium from accumulating in the return pipe.

[0049] Additionally, the ball head 3 of the return pipe is threadedly connected to the tail end 5 of the return pipe. The outlet 4 of the return pipe is designed with threads, which can be connected to a compressed air source to continuously output annular compressed air from the water-proof space, preventing droplets from the external annular high-pressure water flow from entering the powder pipe. This also serves as a water-proofing effect. Users can choose according to their specific needs. The outlet 4 of the return pipe can be connected to a compressed air source or used solely for drainage.

[0050] In this embodiment, a water-tight space is provided inside, consisting of a return pipe ball head 3, a return pipe outlet 4, and a return pipe tail 5. The purpose of this design is to prevent the external high-pressure annular water flow from immediately contacting the central powder extinguishing agent. Through this design, the water jet droplets fall into the water-tight space and are discharged through the drain outlet, thus avoiding water accumulation inside the mixed jet fire monitor. Furthermore, the water-tight space extends to the curved section enclosing the powder pipe, and a ball head is provided at its end. The drain outlets are symmetrically arranged with the powder pipe. This structure significantly reduces the local resistance at the bend in the powder pipe and simultaneously makes the water velocity distribution within the mixed jet water channel more uniform.

[0051] The present invention ensures that the dry SAP powder and water / water-based media are always transported along independent channels within the equipment and are physically isolated throughout the process. No mixing occurs within the physical interface between the equipment body and the external atmosphere (i.e., the nozzle end face). The outlets of the two media are projected towards the same air space outside the equipment, and they only meet for the first time in this space. During the flight of the jet towards the target, they complete water absorption, swelling, cross-linking and film formation, forming a gel barrier with adhesion, heat insulation and oxygen barrier properties at the moment of target impact.

[0052] The structural features supporting this system utilize a coaxial annular separation channel as the preferred configuration—the central channel independently transports dry powder, while the outer annular channel independently transports water / water-based media. Through momentum exchange between the central and annular jets, the solid-liquid interface rapidly blurs and mixes orderly after exiting the nozzle. The process features involve combining parameters such as powder particle size, gas phase delivery pressure, water flow rate, initial nozzle velocity, and range to match the SAP's water absorption-swelling-crosslinking kinetics with the jet flight time, ensuring unified long-distance delivery and immediate film formation upon arrival. The resulting four common technical features—the gelation reaction site is external to the equipment body; powder and water are completely isolated within the equipment along the branch channels; each channel outlet is projected towards the same external air domain and initially converges within it; and the gelation kinetics during flight are matched with the jet time—together form the technical foundation that distinguishes this technology from premixed gel fire extinguishing schemes.

[0053] Example 2:

[0054] like Figure 2-4 As shown, a mixed jet fire monitor with a return water structure is constructed as described in Example 1, except that a quick-release threaded connector 1 is connected to the end of the front fire monitor wall 2. The quick-release threaded connector allows for rapid connection to the water supply pipeline, improving operational efficiency.

[0055] Example 3:

[0056] like Figure 2 , 3 As shown in Figure 6, this embodiment provides a mixed jet fire monitor with a return water structure, the structure of which is as described in Embodiment 1, except that: the front end of the powder pipe 6 is threadedly connected to an extension pipe 10, which extends out of the main body. The extension pipe further prevents the superabsorbent polymer powder from clogging the main body port.

[0057] Example 4:

[0058] A fire truck, based on a traditional fire truck, is equipped with a hybrid jet fire monitor as described in Embodiment 1, Embodiment 2, or Embodiment 3.

[0059] Example 5:

[0060] A method for operating a mixed jet fire monitor with a return water structure as described in Example 1 includes the following steps:

[0061] 1) Connect the fire monitor to the water supply pipe on the fire equipment, connect the powder pipe to the container containing superabsorbent polymer, and connect the return pipe to the empty container.

[0062] 2) Start the fire-fighting equipment; water and superabsorbent polymer are pumped into the main body and powder pipe respectively.

[0063] 3) After the high-pressure water jet is ejected, it forms a hollow water column of a certain length. After the superabsorbent polymer is ejected, it gradually mixes with the water jet inside the hollow water column and becomes one with it, forming a mixed fire extinguishing medium.

[0064] 4) Part of the water flow from the main body port passes through the return pipe, and at the same time, the residual superabsorbent polymer powder from the main body port is flushed into the return pipe. Finally, the water is discharged from the fire monitor through the return pipe and enters the empty container.

[0065] The above description is merely a specific embodiment of the present invention, and the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A mixed jet fire monitor with a return water structure, characterized in that, Includes the main body and the powder pipe, return pipe and flow stabilizer placed inside the main body; The flow stabilizer is connected to the inner wall of the main body, the return pipe passes through the flow stabilizer and the outlet of the return pipe extends out of the main body, and the powder pipe is placed inside the return pipe and one end passes through the return pipe and extends out of the main body.

2. The mixed jet fire monitor with a return water structure as described in claim 1, characterized in that, The main body is a hollow structure, comprising a front fire monitor wall, a middle fire monitor wall, and a rear fire monitor wall connected in sequence.

3. The mixed jet fire monitor with a return water structure as described in claim 2, characterized in that, The end of the front fire monitor wall is connected to a quick-release threaded connector.

4. The mixed jet fire monitor with a return water structure as described in claim 1, characterized in that, The current stabilizer is a hollow annular body with multiple blades.

5. The mixed jet fire monitor with a return water structure as described in claim 4, characterized in that, The annular body has a total of 12 blades arranged front to back, with 6 blades evenly distributed at the front end and 6 blades evenly distributed at the rear end. The 6 blades at the front end and the 6 blades at the rear end are arranged alternately.

6. The mixed jet fire monitor with a return water structure as described in claim 1, characterized in that, The outlet of the reflux pipe is symmetrically positioned with respect to the inlet of the powder pipe.

7. The mixed jet fire monitor with a return water structure as described in claim 1, characterized in that, The tail end of the reflux pipe is provided with a reflux pipe ball head, which is located behind the reflux pipe outlet.

8. The mixed jet fire monitor with a return water structure as described in claim 1, characterized in that, The powder tube is provided with an extension tube at its front end, which extends out of the main body.

9. A fire truck comprising a mixed jet fire monitor with a return water structure as described in any one of claims 1-8.

10. A method for operating a mixed jet fire monitor with a return water structure as described in any one of claims 1-8, characterized in that, Includes the following steps: 1) Connect the fire monitor to the water supply pipe on the fire equipment, connect the powder pipe to the container containing superabsorbent polymer, and connect the return pipe to the empty container. 2) Start the fire-fighting equipment; water and superabsorbent polymer are pumped into the main body and powder pipe respectively. 3) After the high-pressure water jet is ejected, it forms a hollow water column of a certain length. After the superabsorbent polymer is ejected, it gradually mixes with the water jet inside the hollow water column and becomes one with it, forming a mixed fire extinguishing medium. 4) Part of the water flow from the main body port passes through the return pipe, and at the same time, the residual superabsorbent polymer powder from the main body port is flushed into the return pipe. Finally, the water is discharged from the fire monitor through the return pipe and enters the empty container.

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