Fire hose reel

Abstract

The application belongs to the field of fire-fighting equipment, and discloses a fire hose reel, which comprises a fire reel, a mounting rack is installed on the fire reel, a flow-through part is arranged on the mounting rack, the flow-through part comprises a machine box, the machine box is installed on the mounting rack, a piston cylinder one is installed in the machine box, a water inlet is integrally connected to the middle part of the piston cylinder one, a water receiving pipe is connected to one end of the piston cylinder one, a suppression part is arranged on the flow-through part, the suppression part is suppressed by positive water hammer, the suppression part is converted by kinetic energy and is buffered by gas, the instantaneous speed and pressure of water flow are respectively attenuated, the hose is prevented from being straightened and shaken due to instantaneous high pressure, accidents of misoperation of untrained personnel are fundamentally reduced, the reverse impact generated by the sudden stop of water flow is offset by reverse water hammer resolution, the inert gas backflow and pressure compensation of the compensation part, the hose joint is prevented from being broken due to repeated impact fatigue, and the secondary risk of high-pressure water flow injection is reduced.

Description

Technical Field

[0001] This invention belongs to the field of fire protection, and more specifically relates to the field of fire protection equipment technology, specifically a fire hose reel. Background Technology

[0002] Fire hose reels are crucial for initial fire suppression in buildings. Their core value lies in enabling untrained individuals to quickly operate them, controlling the spread of fire or extinguishing small initial fires with low-pressure water flow, serving as the last line of defense for protecting lives and property. However, in actual emergency use, the water hammer effect causes operational safety issues with existing fire hose reels, severely limiting their emergency effectiveness and even posing direct risks to operators.

[0003] Water hammer is a pressure shock wave phenomenon caused by a sudden change in fluid velocity in a pipeline. When the valve of a fire hose reel is opened or closed rapidly, or when the water flow is suddenly obstructed, the inertia of the water flow will cause an instantaneous high-pressure fluctuation. This pressure wave propagates rapidly within the hose, creating an impact similar to a hammer blow. For fire hose reels, the water hammer effect mainly originates from two key scenarios: First, in an emergency, untrained personnel may quickly turn on the inlet valve or pull the trigger of the water gun due to tension, causing the static water flow to accelerate instantaneously, forming a positive water hammer within the hose; second, during firefighting, a valve may be suddenly closed or the hose may be accidentally bent, causing the water flow to stop abruptly, and the inertia will trigger a reverse water hammer impact.

[0004] Existing protective measures against water hammer have significant limitations and are difficult to adapt to the operating scenarios of ordinary people. Water hammer eliminators commonly used in engineering are mostly large devices that need to be integrated into the main fire protection pipeline network and cannot be miniaturized to fit wall-mounted hose reels; moreover, the valve design of the reels themselves is mostly a common knob type, lacking a slow-opening and slow-closing function, and cannot avoid pressure shocks caused by sudden changes in flow velocity.

[0005] The dangers posed by water hammer impacts to untrained operators are particularly pronounced. First, the instantaneous high pressure generated by the water hammer causes the hose to taut and stiffen instantly, accompanied by strong longitudinal impact and lateral swaying. Because ordinary people lack the skills to hold the hose and experience in controlling their strength, they are easily dragged or struck by the suddenly out-of-control hose or nozzle, resulting in hand contusions, falls, and other accidental injuries. Second, the violent fluctuations in water flow caused by the pressure shockwave make the water jet from the nozzle extremely unstable, with frequent deviations in the spray direction. This not only makes it impossible to accurately target the fire for effective extinguishing but may also ignite surrounding combustibles due to water splashing, thus increasing the fire risk. Furthermore, repeated water hammer impacts can exacerbate fatigue damage to the hose and connectors, potentially causing sudden rupture at the connection point, and the high-pressure water jet further increases the operational risks. Summary of the Invention

[0006] (a) Technical problems to be solved:

[0007] To address the shortcomings of existing technologies, this invention provides a fire hose reel that solves the problem that existing fire hoses, due to their simple structure, cannot suppress the water hammer effect after water is introduced, leading to improper operation by untrained personnel and reduced safety.

[0008] (II) Technical Solution:

[0009] To achieve the above objectives, the present invention provides the following technical solution: a fire hose reel, comprising a fire hose reel, an mounting frame mounted on the fire hose reel, a flow section provided on the mounting frame, the flow section including a housing, the housing mounted on the mounting frame, a piston cylinder I installed inside the housing, a water inlet integrally connected to the middle of the piston cylinder I, a water receiving pipe connected to one end of the piston cylinder I, a suppression section provided on the flow section, the suppression section including a support plate, the support plate mounted on the fire hose reel, a rotating shaft I rotatably connected to the support plate, and a rotating shaft II rotatably connected to the water receiving pipe. One end of the shaft is connected to a rotating blade and located inside the water inlet pipe. Both the first and second rotating shafts are fitted with pulleys, and a transmission belt is connected between the pulleys. A guide plate is installed on the inner wall of the water inlet pipe. A rotating rod is rotatably connected to the support plate. One end of the rotating rod passes through the casing and piston cylinder and extends into the interior of piston cylinder. A helical blade is fixedly connected to the extended end of the rotating rod. Helical gears are fitted on both the rotating end of the rotating rod and the outer wall of the first rotating shaft. The helical gears mesh with each other. A piston rod is installed inside piston cylinder. A piston plate is connected to the piston rod and abuts against the inner wall of piston cylinder.

[0010] Preferably, the water inlet is fixedly inserted through the chassis and simultaneously through the end of the mounting bracket and the center of the fire hose reel, and the water inlet pipe extends to the outside of one side of the chassis.

[0011] Preferably, the circulation section further includes a vent pipe and an injection pipe, both of which are connected to the piston cylinder. Both the vent pipe and the injection pipe are fixedly installed through the casing. A rotary joint is installed at the through end of the vent pipe, and an injection check valve is installed at the through end of the injection pipe.

[0012] Preferably, the suppression part further includes a spring, the piston rod slides through the other end of the piston cylinder and the other side of the housing, the through end of the piston rod is elastically connected to the support plate by the spring, and the piston rod is slidably sleeved on the rotating rod.

[0013] Preferably, the guide plate is inclined and has an arc-shaped structure, and a limit strip is fixedly connected to the outer wall of the rotating rod, with the limit strip sliding through the piston plate and the piston rod.

[0014] Preferably, there are two fire hose reels, and a reel shaft is provided between the two fire hose reels. One end of the reel shaft is rotatably connected to the center of the fire hose reel on the mounting frame, and the other end of the reel shaft is fixedly connected to the center of the other fire hose reel.

[0015] Preferably, the through end of the water inlet is equipped with a rotary joint two via a fire hose reel, and a low-pressure hose is installed at the water inlet via the rotary joint two. The movable end of the low-pressure hose passes through the reel shaft and is wound around the outer wall of the reel shaft. The low-pressure hose is located between two fire hose reels, and the movable end of the low-pressure hose is provided with a compensation part.

[0016] Preferably, the low-pressure hose is provided with a compensation part, the compensation part includes a connecting pipe, the connecting pipe is connected to the movable end of the low-pressure hose, a water spray valve is installed on the connecting pipe, and a water gun head is connected to the end of the connecting pipe.

[0017] Preferably, a piston cylinder two is installed in communication with the side wall of the connecting pipe, a piston rod two is provided inside the piston cylinder two, a piston plate two is installed on the piston rod two, the piston plate two abuts against the inner wall of the piston cylinder two, the end of the piston rod two away from the piston plate two slides through to the outside of one end of the piston cylinder two and is connected to a limiting piece, and an anti-slip sleeve is fixedly sleeved on the outer wall of the piston cylinder two.

[0018] Preferably, a second vent pipe is installed on the side wall of the second piston cylinder, the second vent pipe is fixedly inserted through the anti-slip sleeve, and an airflow pipe is installed between the second vent pipe and the first vent pipe through a rotary joint. The first piston cylinder, the second piston cylinder, and the airflow pipe are all filled with inert gas.

[0019] (III) Beneficial Effects:

[0020] Compared with the prior art, the present invention provides a fire hose reel with the following advantages:

[0021] 1. This fire hose reel uses positive water hammer suppression. The suppression section attenuates the instantaneous speed and pressure of the water flow through kinetic energy conversion and gas buffering, preventing the hose from taut and swinging due to instantaneous high pressure, thus fundamentally reducing accidental injury to untrained personnel. Through reverse water hammer elimination, the inert gas backflow and pressure compensation in the compensation section counteract the reverse impact caused by the sudden stop of water flow, preventing the hose joint from fatigue cracking due to repeated impacts and reducing the secondary risk of high-pressure water jet.

[0022] 2. This fire hose reel uses the coordinated operation of various components to achieve stable water output and full automation. No professional skills are required, and untrained personnel can complete the start-up operation in seconds. The anti-slip sleeve of the compensation part and the gripping structure of the piston cylinder reduce the swing amplitude of the water gun head, ensuring that the water flow is accurately aimed at the ignition point and avoiding the problem of water splashing and igniting surrounding combustibles.

[0023] 3. This fire hose reel utilizes the synergistic effect of the flow section and the compensation section to reduce the fluctuation range of water pressure and maintain a stable water jet distance and direction. It solves the problems of unstable water output and low fire extinguishing efficiency of existing reels. The non-winding design of the reel shaft and the slow-flow structure of the suppression section ensure that the water flow is unobstructed throughout the entire path from the pipe network to the water gun head, without local obstruction, and guarantees a continuous water supply during the initial fire fighting.

[0024] 4. This fire hose reel integrates all components into the fire hose reel and mounting bracket, eliminating the need to occupy space in the main pipeline network like traditional water hammer eliminators. It can be directly installed in wall-mounted scenarios such as corridors in civil buildings and hotel corridors. The inert gas has strong chemical stability, avoiding corrosion of gas circuit components. The limiting strip ensures that there is no radial displacement between piston plate 1 and piston rod 1, reducing component wear and extending the service life of the equipment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a fire hose reel proposed in this invention;

[0026] Figure 2 This is a rear view of the entire invention;

[0027] Figure 3 This is a diagram showing the connection between the mounting bracket and the fire hose reel of the present invention;

[0028] Figure 4 This is an exploded view of the mounting bracket and the flow section of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the circulation section of the present invention;

[0030] Figure 6 This is an internal sectional view of the piston cylinder of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the reel shaft of the present invention;

[0032] Figure 8 This is a schematic diagram of the compensation part of the present invention.

[0033] In the diagram: 1. Fire hose reel; 2. Mounting frame; 3. Flow section; 31. Chassis; 32. Piston cylinder one; 33. Water inlet; 34. Vent pipe one; 35. Air injection pipe; 36. Water inlet pipe; 4. Suppression section; 41. Support plate; 42. Shaft one; 43. Shaft two; 44. Rotating blade; 45. Pulley; 46. Drive belt; 47. Guide plate; 48. Rotating rod; 49. Spiral blade; 410. Helical gear; 411. Piston rod one; 412. Spring; 413. Piston plate one; 414. Limiting strip; 5. Reel shaft; 6. Low-pressure hose; 7. Compensation section; 71. Connecting pipe; 72. Spray valve; 73. Water nozzle; 74. Piston cylinder two; 75. Piston rod two; 76. Vent pipe two; 77. Anti-slip sleeve; 8. Airflow pipe. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-8 This invention relates to fire protection and provides a fire hose reel, comprising a fire hose reel 1, an mounting frame 2 mounted on the fire hose reel 1, and a flow section 3 provided on the mounting frame 2 for directional water delivery and inert gas sealing and replenishment. The flow section 3 includes a housing 31 mounted on the mounting frame 2. A piston cylinder 32 is installed inside the housing 31, with a water inlet 33 integrally connected to the middle of the piston cylinder 32. A water receiving pipe 36 is connected to one end of the piston cylinder 32. The water inlet 33 is fixedly inserted through the housing 31 and simultaneously through the end of the mounting frame 2 and the center of the fire hose reel 1. The water receiving pipe 36 extends to the outside of one side of the housing 31, receiving water from the pipe network. The water flow, after being buffered by piston cylinder 32, is stably delivered to the hose through inlet 33, preventing pressure fluctuations caused by path disturbances during transmission. The flow section 3 also includes a vent pipe 34 and an air injection pipe 35, both of which are connected to piston cylinder 32. Both vent pipe 34 and air injection pipe 35 are fixedly installed through the casing 31. A rotary joint is installed at the through end of vent pipe 34, and an air injection check valve is installed at the through end of air injection pipe 35. Vent pipe 34 provides a circulation channel for inert gas, and air injection pipe 35 replenishes inert gas through the check valve, ensuring that the closed air circuit formed by piston cylinder 32 always maintains the preset pressure, laying the foundation for pressure buffering.

[0036] In this embodiment, a suppression part 4 is provided on the flow section 3 for water kinetic energy conversion, slowing flow, and pressure unloading. The suppression part 4 includes a support plate 41, which is mounted on the fire hose reel 1. A rotating shaft 42 is rotatably connected to the support plate 41, and a rotating shaft 43 is rotatably connected to the water inlet pipe 36. One end of the rotating shaft 43 is surrounded by a rotating blade 44 and located inside the water inlet pipe 36. Both the rotating shaft 42 and the rotating shaft 43 are fitted with pulleys 45, and a transmission belt 46 is drivingly connected between the pulleys 45. A guide plate 47 is installed on the wall. The guide plate 47 is inclined and has an arc-shaped structure. A rotating rod 48 is rotatably connected to the support plate 41. One end of the rotating rod 48 passes through the housing 31 and the piston cylinder 32 and extends into the piston cylinder 32. A spiral blade 49 is fixedly connected to the extended end of the rotating rod 48. Helical gears 410 are fitted on both the rotating end of the rotating rod 48 and the outer wall of the rotating shaft 42. The helical gears 410 mesh with each other. The guide plate 47 in the water inlet pipe 36 guides the water flow to the rotating blade 44, which is then transmitted through the pulley 45 and the transmission belt. 46. ​​The transmission chain of the helical gear 410 converts the kinetic energy of the water flow into the rotational kinetic energy of the rotating rod 48 and the spiral blade 49, initially attenuating the water flow velocity. A piston rod 411 is provided inside the piston cylinder 32, and a piston plate 413 is connected to the piston rod 411. The piston plate 413 abuts against the inner wall of the piston cylinder 32. The suppression part 4 also includes a spring 412. The piston rod 411 slides through the other end of the piston cylinder 32 and the other side of the housing 31. The through end of the piston rod 411 is connected to the support plate 41 by the spring. 412 is elastically connected. Piston rod 411 is slidably sleeved on rotating rod 48. Limiting strip 414 is fixedly connected to the outer wall of rotating rod 48. Limiting strip 414 slides through piston plate 413 and piston rod 411. Spiral blade 49 forms a spiral flow channel in piston cylinder 32, extending the water flow path and turbulence, avoiding instantaneous impact flow. At the same time, piston plate 413 compresses inert gas under water pressure, and spring 412 provides reverse damping. Together, they convert the instantaneous pressure of water flow into the elastic potential energy of gas, suppressing positive water hammer from the source.

[0037] It is worth noting that there are two fire hose reels 1. A reel shaft 5 is provided between the two fire hose reels 1. One end of the reel shaft 5 is rotatably connected to the center of the fire hose reel 1 on the mounting frame 2, and the other end of the reel shaft 5 is fixedly connected to the center of the other fire hose reel 1. The through end of the water inlet 33 is equipped with a rotary joint 2 through the fire hose reel 1. A low-pressure hose 6 is installed through the rotary joint 2. The movable end of the low-pressure hose 6 passes through the reel shaft 5 and is wound around the outer wall of the reel shaft 5. The low-pressure hose 6 is located between the two fire hose reels 1. A compensation part 7 is provided at the movable end of the low-pressure hose 6.

[0038] It is worth noting that the low-pressure hose 6 is equipped with a compensation section 7 for reverse water hammer elimination, pressure compensation, and operational safety. The compensation section 7 includes a connecting pipe 71, which is connected to the movable end of the low-pressure hose 6. A water spray valve 72 is installed on the connecting pipe 71, and a water gun head 73 is connected to the end of the connecting pipe 71. A piston cylinder 74 is connected to the side wall of the connecting pipe 71. A piston rod 75 is installed inside the piston cylinder 74, and a piston plate 2 is installed on the piston rod 75. The piston plate 2 abuts against the inner wall of the piston cylinder 74. The end of the piston rod 75 away from the piston plate 2 slides through to the outside of one end of the piston cylinder 74 and is connected to a limit plate. The outer wall of the piston cylinder 74 is fixedly fitted with an anti-slip sleeve. The side wall of piston cylinder 74 is connected to the sleeve 77 and the vent pipe 76. The vent pipe 76 is fixedly connected to the anti-slip sleeve 77. The anti-slip sleeve 77 increases the grip friction and prevents the operator's hand from slipping due to the swinging of the water gun head 73. The vent pipe 76 is connected to the vent pipe 34 through the rotary joint and an airflow pipe 8 is installed. Piston cylinder 32, piston cylinder 74 and airflow pipe 8 are all filled with inert gas. Part of the water flow in the connecting pipe 71 pushes the piston plate 2 in piston cylinder 74, causing the inert gas to flow back to piston cylinder 32, pushing piston plate 413 to reset and squeeze the water flow. This prevents the water flow from being reversed due to sudden stop or pressure drop, and at the same time maintains the water output pressure stable to prevent weak water output.

[0039] Working principle: The fire hose reel 1 is pre-installed in the fire cabinet via the hinge structure of the mounting bracket 2. The low-pressure hose 6 is wound in an orderly manner around the reel shaft 5, ensuring that the hose is free of folds and sharp bends. The water nozzle 73 faces the cabinet door for easy and quick access. The water inlet pipe 36 is sealed and connected to the main water valve of the building's fire protection network. The airflow pipe 8 is stored in the cabinet in a naturally extended state to avoid bends that could cause blockage of the air passage. The closed air passage composed of piston cylinder 1 32, piston cylinder 2 74, and airflow pipe 8 is pre-filled with inert gas, preferably nitrogen, which has both chemical stability and buffer compatibility. The one-way valve structure of the air injection pipe 35 ensures the air passage is sealed, laying the foundation for subsequent pressure buffering.

[0040] During emergency activation, the operator opens the fire cabinet, rotates the fire hose reel 1 to the outside operating position using the hinge of the mounting bracket 2 as the rotation axis, holds the anti-slip sleeve 77 to increase grip friction and improve operational stability, and pulls the water gun head 73 to drive the low-pressure hose 6 to unfold along the reel shaft 5. During this process, the connection end of the low-pressure hose 6 and the water inlet 33 achieves untangled rotation through the rotary joint 2, ensuring that the flow channel is always unobstructed when the hose is unfolded, avoiding local water flow obstruction caused by hose twisting, and reducing the causes of water hammer from the source.

[0041] The arc-shaped inclined guide plate 47 pre-installed on the inner wall of the water inlet pipe 36 guides the axially flowing water to one side of the inner wall of the pipe, forming a spiral flow along the pipe wall. This design can avoid the water flow directly impacting the internal components of the pipe and causing local pressure changes. At the same time, the flow state optimization makes the kinetic energy of the water flow evenly distributed, preparing for subsequent kinetic energy conversion.

[0042] The spiral flow of water impacts the rotating blades 44 inside the water inlet pipe 36, driving the second rotating shaft 43 to rotate around its own axis. The second rotating shaft 43 transmits rotational kinetic energy to the first rotating shaft 42 through the synchronous transmission structure of the pulley 45 and the transmission belt 46. Then, through the meshing transmission of the helical gear 410 between the first rotating shaft 42 and the rotating rod 48, the rotating rod 48 and the spiral blades 49 are driven to rotate synchronously. In this process, the kinetic energy of the water flow is converted into the rotational kinetic energy of the rotating rod 48 through mechanical transmission, realizing the initial attenuation of the initial velocity of the water flow.

[0043] The rotating helical blade 49 forms a dynamic flow channel inside the piston cylinder 32. The water flow needs to be slowly advanced along the helical groove of the helical blade 49. The helical structure extends the flow path of the water flow in the piston cylinder 32. At the same time, the turbulence effect generated by the rotation of the blades is used to transform the instantaneous impact flow of the water flow into a smooth propulsion flow, effectively suppressing the sudden change in flow velocity caused by positive water hammer.

[0044] Under the pressure of the water flow, piston plate 413 slides along the inner wall of piston cylinder 32 away from the inlet 33, simultaneously compressing the inert gas chamber between piston plate 413 and the end of piston cylinder 32. According to Boyle's law, the inert gas is compressed in the closed chamber, and the pressure increases as the volume decreases. During this process, the instantaneous pressure of the water flow is converted into the elastic potential energy of the gas through gas compression, realizing the temporary storage of pressure energy and avoiding the pressure from directly acting on the low-pressure hose 6, causing the hose to straighten or swing.

[0045] The inert gas compressed in piston cylinder 32 is simultaneously delivered to the inert gas chamber of piston cylinder 74 through a closed gas path consisting of vent pipe 34, rotary joint 1, and airflow pipe 8. This pushes piston plate 2 in piston cylinder 74 to slide towards connecting pipe 71. This design ensures that the inert gas pressure in piston cylinder 32 and piston cylinder 74 is always balanced, avoiding damage to gas path components due to excessive local pressure. At the same time, the superposition of gas volumes in the two cylinders enhances the system's ability to withstand instantaneous high pressure, further strengthening the water hammer suppression effect.

[0046] During the axial sliding of piston plate 413 and piston rod 411, spring 412 between piston rod 411 and support plate 41 is compressed. The elastic force of spring 412 and the compressive force of inert gas work together to form flexible damping for the sliding of piston plate 413, preventing piston plate 413 from being violently impacted by the sudden increase in water pressure. At the same time, it provides a power basis for component reset in the subsequent pressure compensation stage. In addition, the limiting strip 414 on the outer wall of rotating rod 48 passes through piston plate 413 and piston rod 411 to ensure that piston plate 413 has no radial displacement during sliding, thus ensuring the sealing performance of the gas-liquid chamber.

[0047] Part of the water flow entering the connecting pipe 71 enters the water chamber of the piston cylinder 74 through the connection port between the connecting pipe 71 and the piston cylinder 74, generating a reverse thrust on the piston plate 2. When the water flow thrust is greater than the inert gas pressure, the piston plate 2 slides away from the connecting pipe 71, compressing the inert gas chamber in the piston cylinder 74, causing the inert gas in the chamber to flow back along the original gas path to the inert gas chamber of the piston cylinder 32, pushing the piston plate 413 to reset towards the water inlet 33.

[0048] During the resetting process of piston plate 413, the volume of the water flow chamber in piston cylinder 32 decreases, generating a moderate squeezing thrust on the water flow, so that the water flow maintains a stable propulsion pressure and avoids weak water output due to low water pressure. At the same time, the squeezing thrust can offset the pressure fluctuation caused by the inertia of the water flow during the water output process of low pressure hose 6, and prevent the pressure rebound of reverse water hammer.

[0049] After bidirectional pressure compensation, the water flow forms a stable pressure field in the connecting pipe 71. After the operator opens the water spray valve 72, the water flow is evenly sprayed out along the guide structure of the water gun head 73. The water outlet direction is stable throughout the process, effectively avoiding the water gun head 73 from swinging due to pressure fluctuations. This ensures that untrained personnel can safely hold and operate the device, while also ensuring that the water flow is accurately applied to the ignition point, maximizing the initial fire extinguishing efficiency.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A fire hose reel, comprising a fire hose reel (1), characterized in that: The fire hose reel (1) is equipped with a mounting frame (2), and the mounting frame (2) is provided with a flow section (3). The flow section (3) includes a housing (31), which is mounted on the mounting frame (2). A piston cylinder (32) is installed inside the housing (31). A water inlet (33) is integrally connected to the middle of the piston cylinder (32). A water inlet pipe (36) is connected to one end of the piston cylinder (32). The flow section (3) also includes a vent pipe (34) and an air injection pipe (35). Both the vent pipe (34) and the air injection pipe (35) are connected to the piston cylinder (32). Both the vent pipe (34) and the air injection pipe (35) are fixedly connected through the housing (31). A rotary joint is installed at the through end of the vent pipe (34), and an air injection check valve is installed at the through end of the air injection pipe (35). The flow section (3) is provided with a suppression section (4), the suppression section (4) includes a support plate (41), the support plate (41) is installed on the fire hose reel (1), a rotating shaft (42) is rotatably connected to the support plate (41), a rotating shaft (43) is rotatably connected to the water receiving pipe (36), a rotating blade (44) is connected around one end of the rotating shaft (43) and is located inside the water receiving pipe (36), a pulley (45) is sleeved on both the rotating shaft (42) and the rotating shaft (43), a transmission belt (46) is connected between the pulleys (45), and a guide plate (47) is installed on the inner wall of the water receiving pipe (36). A rotating rod (48) is rotatably connected to the support plate (41). One end of the rotating rod (48) passes through the housing (31) and the piston cylinder (32) and extends into the piston cylinder (32). A spiral blade (49) is fixedly connected to the extended end of the rotating rod (48). Helical gears (410) are fitted on both the rotating end of the rotating rod (48) and the outer wall of the rotating shaft (42). The helical gears (410) mesh with each other. A piston rod (411) is provided inside the piston cylinder (32). A piston plate (413) is connected to the piston rod (411). The piston plate (413) abuts against the inner wall of the piston cylinder (32). There are two fire hose reels (1), and a reel shaft (5) is provided between the two fire hose reels (1). The inlet (33) has a rotating joint 2 installed at its through end via the fire hose reel (1). The inlet (33) has a low-pressure hose (6) installed via the rotating joint 2. The movable end of the low-pressure hose (6) passes through the reel shaft (5) and is wound around the outer wall of the reel shaft (5). The low-pressure hose (6) is located between the two fire hose reels (1). The movable end of the low-pressure hose (6) is provided with a compensation part (7). The compensation unit (7) includes a connecting pipe (71), which is connected to the movable end of the low-pressure hose (6). A water spray valve (72) is installed on the connecting pipe (71), and a water gun head (73) is connected to the end of the connecting pipe (71). The side wall of the connecting pipe (71) is connected to a piston cylinder two (74). A piston rod two (75) is provided inside the piston cylinder two (74). A piston plate two is installed on the piston rod two (75). The piston plate two abuts against the inner wall of the piston cylinder two (74). The end of the piston rod two (75) away from the piston plate two slides through to the outside of one end of the piston cylinder two (74) and is connected to a limiting piece. An anti-slip sleeve (77) is fixedly sleeved on the outer wall of the piston cylinder two (74). The side wall of the piston cylinder 2 (74) is connected to the vent pipe 2 (76), the vent pipe 2 (76) is fixedly connected to the anti-slip sleeve (77), and the vent pipe 2 (76) is connected to the vent pipe 1 (34) through the rotary joint and is connected to the air flow pipe (8). The piston cylinder 1 (32), piston cylinder 2 (74) and air flow pipe (8) are all filled with inert gas.

2. The fire hose reel according to claim 1, characterized in that: The water inlet (33) is fixedly inserted through the chassis (31) and simultaneously through the end of the mounting bracket (2) and the center of the fire hose reel (1). The water inlet pipe (36) extends to the outside of one side of the chassis (31).

3. A fire hose reel according to claim 1, characterized in that: The suppression part (4) also includes a spring (412). The piston rod (411) slides through the other end of the piston cylinder (32) and the other side of the housing (31). The through end of the piston rod (411) is elastically connected to the support plate (41) by the spring (412). The piston rod (411) is slidably sleeved on the rotating rod (48).

4. A fire hose reel according to claim 1, characterized in that: The guide plate (47) is inclined and has an arc-shaped structure. The outer wall of the rotating rod (48) is fixedly connected to a limiting strip (414). The limiting strip (414) slides through the piston plate (413) and the piston rod (411).

5. A fire hose reel according to claim 1, characterized in that: One end of the reel shaft (5) is rotatably connected to the center of the fire hose reel (1) on the mounting frame (2), and the other end of the reel shaft (5) is fixedly connected to the center of another fire hose reel (1).

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