A pressurized piston-type deluge alarm valve

Abstract

This invention relates to the field of fire protection equipment technology, and in particular to a pressurized piston-type deluge alarm valve. Its structure includes an upper valve body and a lower valve body, and a piston chamber fixed between the upper and lower valve bodies. A piston plate is provided inside the piston chamber, and a piston rod is slidably connected to the top of the piston plate. A valve disc for controlling the opening and closing of the deluge valve is located at the top of the piston rod. A scraping assembly for scraping deposits adhering to the inner wall of the piston chamber is located at the bottom of the piston plate. This invention, by setting a scraping assembly at the bottom of the piston plate and combining it with a first driving mechanism, enables the scraping assembly to rotate synchronously with the up-and-down movement of the piston plate. This allows the scraper blade to automatically scrape the inner wall of the piston chamber circumferentially during each opening and closing of the valve, automatically removing deposits such as scale and rust adhering to the inner wall. This prevents deposit accumulation from causing piston plate jamming, ensures smooth piston plate movement, and guarantees normal opening and closing of the valve disc.

Description

Technical Field

[0001] This invention relates to the field of fire protection equipment technology, and in particular, to a pressurized piston-type deluge alarm valve. Background Technology

[0002] Deluge valves are core control valves in automatic sprinkler systems. Their working principle relies on the pressure difference inside and outside the piston chamber to drive the piston plate up and down, which in turn drives the valve disc to open and close, achieving rapid release of the extinguishing medium. Pressurized piston-type deluge valves are widely used in fire suppression systems in various buildings and industrial sites due to their stable structure and reliable opening and closing. However, in actual use, fire-fighting water often contains impurities, minerals, and microorganisms, which can easily cause deposits to accumulate on the inner wall of the piston chamber, forming scale.

[0003] A rain alarm valve is disclosed in patent document CN104455664A, which consists of a valve seat, upper and lower valve bodies, bushing, piston, spring, middle valve body, spindle, base plate, sealing ring, pressure plate, float ball, and screw plug. The middle valve body is fastened to the upper and lower valve bodies. The main sealing ring is clamped by the base plate and pressure plate and screwed to the upper side of the spindle. The float ball is sealed in the hole of the base plate by the screw plug. The spring is located between the middle valve body and the piston. The piston is screwed to the lower end of the spindle and installed in the piston cavity of the middle valve body. In practical applications, existing piston-type deluge valves still have the following shortcomings: Firstly, the thickened deposit layer significantly increases the frictional resistance of the piston movement, leading to sluggish valve opening and closing response. In severe cases, the piston and cavity wall become stuck due to scale buildup, preventing the valve from opening or closing properly. Secondly, the deposits form irregular protrusions and gaps between the piston and cavity wall mating surfaces, disrupting the original sealing fit, causing fluid leakage, and affecting the system's water control accuracy and safety. Furthermore, the solidified deposits are highly hard and tightly bonded to the cavity wall surface, making them difficult to remove effectively with conventional flushing methods. Manual disassembly and component-by-component cleaning are usually required, resulting in high maintenance costs, cumbersome operation, and the frequent disassembly and reassembly themselves accelerating the wear and aging of the seals. Summary of the Invention

[0004] This invention provides a pressurized piston-type deluge alarm valve, which can effectively solve the above-mentioned problems.

[0005] This invention is implemented as follows: A pressurized piston-type deluge alarm valve comprises an upper valve body and a lower valve body, and a piston chamber fixed between the upper and lower valve bodies. A piston plate is disposed within the piston chamber. A piston rod is slidably connected to the top of the piston plate and to the top of the piston chamber. A valve disc for controlling the opening and closing of the deluge valve is disposed at the top of the piston rod. A scraping assembly for scraping deposits adhering to the inner wall of the piston chamber is disposed at the bottom of the piston plate. The scraping assembly includes an annular scraper frame coaxially disposed at the bottom of the piston plate, with multiple scraper blades evenly distributed at equal intervals along its outer edge. The outer side of each scraper blade is in close contact with the inner wall of the piston chamber. A first driving mechanism is disposed within the piston chamber, causing the annular scraper frame to rotate synchronously with the piston plate as it moves up and down, thereby achieving circumferential scraping of deposits on the inner wall of the piston chamber.

[0006] As a further improvement, the first drive mechanism includes a transmission shaft coaxially arranged with the piston rod, the transmission shaft being fixed to the bottom of the piston chamber; the bottom of the piston plate is provided with a central through hole for the transmission shaft to pass through, and the piston rod forms an axial channel communicating with the central through hole and slidingly engaging with the transmission shaft; the annular scraper holder has an inner annular sleeve fitted into the central through hole, the inner wall of which is provided with several inclined grooves arranged equidistantly along the circumference, the upper and lower ends of two adjacent inclined grooves being on the same vertical line; the outer wall of the transmission shaft is provided with several protruding teeth that match the inclined grooves at equal intervals from top to bottom, the axial distance between two adjacent upper and lower protruding teeth being equal to the height of the inclined groove, and the inner wall of the axial channel of the piston rod is uniformly formed with guide grooves that slide and engage with the protruding teeth.

[0007] As a further improvement, the piston plate is provided with an annular groove for rotating and positioning the annular scraper holder, and the annular scraper holder has an outer convex ring that matches the annular groove; the scraper blade includes a blade body located at the bottom of the outer convex ring, with its cutting edge facing the inner wall of the piston cavity, a guide post at the top of the blade body, and a limiting plate at the top of the guide post; the bottom of the outer convex ring has a radial guide hole for the guide post to slide up and down, and the outer convex ring has a radial limiting groove for the limiting plate to slide up and down; it also includes a second driving mechanism that drives two adjacent scraper blades to form an alternating shearing trajectory along the inner wall of the piston cavity when the annular scraper holder rotates.

[0008] As a further improvement, the second drive mechanism includes transmission links located on the front and rear sides of the limiting plate. The inner and outer sides of the outer convex ring are provided with guide grooves for the transmission links to pass through and reciprocate up and down. The inner and outer sides of the annular groove are provided with guide rails that cooperate with the guide grooves. The guide rails have a continuous wave-like structure with the ends connected, and the waveforms of the inner and outer guide rails are synchronized. The radial distance between the crests and troughs of the guide rails is equal to the radial distance between the transmission links of two adjacent scraper blades.

[0009] As a further improvement, the cutting edge of the blade body has a plurality of downwardly extending serrated structures.

[0010] As a further improvement, a locking boss is formed at one end of the axial channel of the piston rod near the valve disc, and a helical spring is sleeved inside the axial channel, with the two ends of the helical spring abutting against the locking boss and the top of the drive shaft, respectively.

[0011] As a further improvement, the drive shaft is a hollow cylinder that runs vertically through the shaft, with several radial through holes evenly distributed at equal intervals on its outer wall.

[0012] As a further improvement, the top of the drive shaft is provided with a first limiting protrusion that fixes one end of the helical spring, and the locking protrusion of the piston rod axial channel is provided with a second limiting protrusion that fixes the other end of the helical spring.

[0013] As a further improvement, the piston chamber is connected to a water supply pipe and a pressure relief channel at its left and right ends, respectively; the piston chamber is divided into two independent chambers, upper and lower, by a piston plate, with the upper chamber connected to the water supply pipe and the lower chamber connected to the atmosphere through the pressure relief channel.

[0014] The beneficial effects of this invention are: 1. The present invention provides a scraping assembly at the bottom of the piston plate, which, in conjunction with the first driving mechanism, enables the scraping assembly to rotate synchronously with the piston plate as it moves up and down. This allows the scraper blade to automatically scrape the inner wall of the piston cavity circumferentially during each opening and closing of the valve, automatically removing deposits such as scale and rust from the inner wall. This prevents the accumulation of deposits from causing the piston plate to jam, ensuring smooth piston plate movement and guaranteeing normal valve opening and closing.

[0015] 2. The present invention uses a second driving mechanism to make adjacent scraper blades generate an alternating shearing motion while revolving with the annular scraper frame, forming a multiple action of tearing, breaking and peeling off the deposits, which greatly improves the ability to remove hard scale and attached deposits and reduces the risk of piston plate jamming. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is an isometric view of the overall structure of the pressurized piston-type deluge valve of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is a cross-sectional isometric view of the internal structure of the upper and lower valve bodies of the present invention; Figure 4This is a partial structural diagram of the connection between the piston chamber and the pipe in this invention; Figure 5 This is a cross-sectional axonometric view of the internal structure of the piston cavity of the present invention; Figure 6 This is an exploded view of the piston plate, piston rod, and scraping assembly of the present invention; Figure 7 This is a partial enlarged view of the annular scraper holder and detailed installation of the scraper blades of the present invention; Figure 8 This is an assembly cross-sectional view of the piston plate and the annular scraper holder of the present invention; Figure 9 This is an exploded view of the annular scraper holder and scraper blade of the present invention; Figure 10 This is a schematic diagram of the structure of the wave-shaped guide rail inside the annular channel of the present invention; Figure 11 This is a partial cross-sectional view of the piston rod, piston plate, and annular scraper frame of the present invention. Figure 12 This is a cross-sectional view of the internal structure of the piston cavity of the present invention; Figure 13 This is an exploded schematic diagram of the engagement between the annular scraper holder and the drive shaft of the present invention; Figure 14 This is a partial enlarged cross-sectional view of the fit between the inclined groove and the convex tooth of the present invention; Figure 15 This is an exploded view of the piston rod, piston plate, and transmission shaft of the present invention; Figure 16 This is the present invention. Figure 15 A magnified view of a portion of point A in the middle.

[0018] In the diagram: 1. Upper valve body; 2. Lower valve body; 3. Piston chamber; 4. Piston plate; 41. Central through hole; 42. Annular groove; 5. Piston rod; 51. Guide groove; 52. Second limiting convex ring; 6. Valve disc; 7. Scraping assembly; 71. Annular scraper holder; 711. Inner ring sleeve; 712. Inclined groove; 713. Outer edge convex ring; 714. Radial guide hole; 715. Radial limiting groove; 72. Scraper blade; 721. Blade body; 722. Guide post; 723. Limiting plate; 8. First drive mechanism; 81. Drive shaft; 82. Convex tooth; 83. Radial through hole; 84. First limiting convex ring; 9. Second drive mechanism; 91. Transmission connecting rod; 92. Guide slide; 93. Guide rail; 10. Helical spring; 11. Water supply pipe; 12. Pressure relief channel. Detailed Implementation

[0019] All embodiments of the present invention are intended to fall within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating that the purpose, technical solution, and advantages of the method are clearer. The technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort indicate or imply the relative importance of the indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] Existing piston-type deluge valves lack a self-cleaning mechanism for the piston cavity wall. As deposits accumulate, on the one hand, the thickened deposit layer significantly increases the frictional resistance of the piston movement, leading to sluggish valve opening and closing response. In severe cases, the piston and cavity wall become stuck due to scale buildup, preventing the valve from opening or closing properly. On the other hand, deposits form irregular protrusions and gaps between the piston and cavity wall mating surfaces, disrupting the original sealing fit, causing fluid leakage, and affecting the system's water control accuracy and safety. Furthermore, the solidified deposits are highly hard and tightly bonded to the cavity wall surface, making them difficult to remove effectively using conventional flushing methods. This typically requires manual disassembly of the valve for component cleaning, resulting in high maintenance costs, cumbersome operation, and frequent disassembly and assembly, which accelerates the wear and aging of the seals. To address these technical problems, this paper proposes the following technical solution: Reference Figures 1-16As shown, a pressurized piston-type deluge alarm valve comprises an upper valve body 1 and a lower valve body 2, and a piston chamber 3 fixed between the upper valve body 1 and the lower valve body 2 by flanges and fasteners. The piston chamber 3 is a cylindrical cavity with an axially sliding piston plate 4 inside. A sealing ring is circumferentially embedded in the piston plate 4, forming a sliding seal with the inner wall of the piston chamber 3. A piston rod 5 is fixedly connected to the top center of the piston plate 4, extending upwards and slidably connected to a guide sleeve at the top of the piston chamber 3. A valve disc 6 for controlling the opening and closing of the deluge valve is installed at the top of the piston rod 5. When the piston plate 4 moves up and down under pressure difference, the piston rod 5 drives the valve disc 6 to leave or press against the valve seat of the upper valve body 1, thereby opening or closing the deluge valve.

[0022] A scraping assembly 7 for scraping deposits adhering to the inner wall of the piston cavity 3 is installed at the bottom of the piston plate 4. The scraping assembly 7 includes an annular scraper holder 71 coaxially disposed at the bottom of the piston plate 4. Multiple scraper blades 72 are evenly distributed at equal intervals along the outer edge of the annular scraper holder 71, and the outer edge of each scraper blade 72 is in close contact with the inner wall of the piston cavity 3. A first drive mechanism 8 is provided inside the piston cavity 3 to drive the annular scraper holder 71 to rotate synchronously with the piston plate 4 as it moves up and down. When the deluge valve opens and closes, the piston plate 4 slides up and down along the inner wall of the piston cavity 3. The first drive mechanism 8 converts the linear motion of the piston plate 4 into the rotational motion of the annular scraper holder 71 around its axis, so that the scraper blades 72 scrape the deposits on the inner wall of the piston cavity 3 in a circumferential manner, thereby achieving automatic cleaning of the inner wall without adding extra operations.

[0023] In this embodiment, by integrating the scraping assembly into the bottom of the piston plate, the inherent motion of the valve during opening and closing drives the scraper blade to rotate and scrape, so that the motion trajectory of the scraping assembly 7 changes from a single straight line to a spiral line. This allows for a large-scale circumferential scraping coverage of the inner wall of the piston cavity 3 within a single piston stroke, significantly improving the cleaning area and efficiency. At the same time, it eliminates the need for machine shutdown and disassembly for cleaning, solving the problem of increased frictional resistance and valve jamming caused by the accumulation of deposits on the inner wall of the piston cavity, and significantly improving the reliability and maintenance convenience of the deluge valve.

[0024] The first driving mechanism 8 includes a transmission shaft 81 coaxially arranged with the piston rod 5. The transmission shaft 81 is fixed at the center of the bottom of the piston chamber 3, and the transmission shaft 81 and the piston chamber 3 are integrally formed. The bottom of the piston plate 4 is provided with a central through hole 41 for the transmission shaft 81 to pass through. The piston rod 5 has an axial channel that communicates with the central through hole 41 and slides with the transmission shaft 81. The transmission shaft 81 can slide relative to the transmission shaft 81 in the axial channel. The annular scraper holder 71 has an inner annular sleeve 711 sleeved in the central through hole 41. Its inner wall is provided with a plurality of inclined grooves 712 arranged equidistantly along the circumferential direction. The inclined grooves 712 are at a certain angle relative to the axial direction. The inclined angle arrangement is such that the upper and lower ends of two adjacent inclined grooves 712 are on the same vertical line; the outer wall of the transmission shaft 81 is provided with a number of protruding teeth 82 that match the inclined grooves 712 at equal intervals from top to bottom. The cross-sectional shape of the protruding teeth 82 is adapted to the cross-sectional shape of the inclined grooves 712, and the axial distance between two adjacent upper and lower protruding teeth 82 is equal to the height of the inclined grooves 712, so as to ensure that the protruding teeth 82 can mesh with the inclined grooves 712 in sequence; the inner wall of the axial channel of the piston rod 5 is uniformly formed with guide grooves 51 that slide and mesh with the protruding teeth 82. The guide grooves 51 extend axially, so that the piston rod 5 can slide axially relative to the transmission shaft 81, while being circumferentially limited.

[0025] When the piston plate 4 drives the piston rod 5 to move up and down, since the transmission shaft 81 is fixed, the guide groove 51 inside the piston rod 5 slides along the protruding teeth 82 on the transmission shaft 81, ensuring that the piston rod 5 can only move axially and cannot rotate. At the same time, the annular scraper holder 71 is sleeved on the outside of the transmission shaft 81, and the inclined groove 712 on the inner wall of its inner ring sleeve 711 cooperates with the protruding teeth 82 on the outer wall of the transmission shaft 81. When the piston plate 4 moves downward, the protruding teeth 82 on the transmission shaft 81 apply a thrust to the inclined side wall of the inclined groove 712, forcing the annular scraper holder 71 to rotate around the axis; when the piston plate 4 moves upward, the upper protruding teeth 82 cooperate with the adjacent inclined groove 712, driving the annular scraper holder 71 to rotate in the opposite direction again. Thus, each reciprocating motion of the piston plate 4 is converted into the rotational motion of the annular scraper holder 71, so that the scraper blade 72 continuously scrapes the inner wall of the piston cavity 3, thereby effectively removing deposits and attached impurities, ensuring smooth operation of the piston plate 4, reliable sealing, and significantly extending the service life of the valve.

[0026] This embodiment adopts a structure that combines a fixed drive shaft with a rotating scraper holder. The scraping action is completely synchronized with the opening and closing of the valve, without the need for an additional drive device and control system.

[0027] The piston plate 4 has an annular groove 42 for rotating and positioning the annular scraper holder 71, which accommodates the upper structure of the annular scraper holder 71. The annular scraper holder 71 has an outer edge protrusion 713 that matches the annular groove 42. The outer edge protrusion 713 is embedded in the annular groove 42, which can both support the weight of the annular scraper holder 71 and restrict its axial displacement, so that it can only rotate about the axis relative to the piston plate 4. The scraper blade 72 includes a blade body 721 located at the bottom of the outer edge protrusion 713, with its cutting edge facing the inner wall of the piston cavity 3, and the cutting edge maintaining an appropriate distance from the inner wall. Contact pressure; the top of the blade body 721 is provided with a guide post 722, the top of the guide post 722 is provided with a limiting plate 723, the radial dimension of the limiting plate 723 is larger than the diameter of the guide post 722; the bottom of the outer edge protruding ring 713 has a radial guide hole 714 for the guide post 722 to slide up and down, the outer edge protruding ring 713 has a radial limiting groove 715 for the limiting plate 723 to slide up and down, the radial limiting groove 715 communicates with the radial guide hole 714, the limiting plate 723 is restricted in the radial limiting groove 715 to prevent the guide post 722 from coming out of the radial guide hole 714. Therefore, the scraper blade 72 can slide up and down relative to the annular scraper holder 71 within the stroke range of the radial limiting groove 715; it also includes a second drive mechanism 9 that drives two adjacent scraper blades 72 to form an alternating shearing trajectory along the inner wall of the piston cavity when the annular scraper holder 71 rotates. By setting the scraper blade to a structure that can float up and down, and cooperating with the second drive mechanism 9, the scraper blade generates a reciprocating up and down motion while rotating with the annular scraper holder 71, forming a shearing effect on the deposits, which significantly improves the removal effect of stubborn deposits.

[0028] The second driving mechanism 9 includes transmission connecting rods 91 located on the front and rear sides of the limiting plate 723, i.e., on the front and rear sides along the rotation direction of the annular scraper frame 71. The inner and outer sides of the outer convex ring 713 are provided with guide grooves 92 for the transmission connecting rods 91 to pass through and reciprocate up and down. The guide grooves 92 radially penetrate the sidewalls of the outer convex ring 713. The inner and outer sides of the annular channel 42 are provided with guide rails 93 that cooperate with the guide grooves 92. Figure 10 As shown, the guide rail 93 has a continuous wave-like structure with its crests and troughs alternating along the axial direction. The waveforms of the inner and outer guide rails 93 are synchronized, meaning that when the inner guide rail 93 is at a crest, the outer guide rail 93 is also at a crest, ensuring that the transmission link 91 is under balanced force. The radial distance between the crests and troughs of the guide rail 93 is equal to the radial distance between the transmission links 91 of two adjacent scraper blades 72, allowing the transmission links 91 of adjacent scraper blades 72 to correspond to the crests and troughs of the guide rail 93, respectively.

[0029] When the annular scraper holder 71 rotates under the drive of the first drive mechanism 8, the transmission connecting rods 91 on each scraper blade 72 slide along the wavy surface of the guide rail 93 together with the annular scraper holder 71. Since the guide rail 93 is fixed in the annular groove 42 of the piston plate 4, the transmission connecting rods 91 drive the guide column 722 and the limiting plate 723 to move up and down reciprocally in the radial guide hole 714 and the radial limiting groove 715 under the undulating action of the guide rail 93. By reasonably arranging the phases of the guide rails 93 corresponding to adjacent scraper blades 72, when one of the two adjacent scraper blades 72 is in the upward stroke, the other is in the downward stroke, thereby forming dynamic tearing and shearing forces at the same circumferential position on the inner wall of the piston chamber 3. This can effectively cut into and break the internal structure of the hard solidified scale layer, tearing the originally difficult-to-remove hard scale layer into fragments and peeling it off.

[0030] The blade body 721 has a cutting edge with several downward-extending serrated structures. The tips of the serrations preferentially contact and penetrate the deposit layer, generating greater local pressure through point contact, effectively breaking up hard scale deposits such as calcium carbonate and calcium sulfate. The serrated structure can also divide large pieces of deposit into smaller pieces, making it easier for subsequent water flow to wash them away, preventing whole pieces of deposit from getting stuck between the piston cavity wall and the piston plate. At the same time, the contact between the serrated cutting edge and the inner wall is intermittent, which reduces the friction area compared to a continuous cutting edge, lowers scraping resistance, and extends the blade's service life.

[0031] A locking protrusion is formed at one end of the axial channel of the piston rod 5 near the valve disc 6. A helical spring 10 is sleeved inside the axial channel. The upper end of the helical spring 10 abuts against the lower surface of the locking protrusion, and the lower end of the helical spring 10 abuts against the top of the drive shaft 81. When the piston plate 4 moves downward to near its lower limit position, the helical spring 10 is compressed, absorbing impact energy and slowing down the movement speed of the piston plate 4. When the piston plate 4 needs to be reset upward, the elastic restoring force of the helical spring 10 can assist in pushing the piston rod 5 upward, improving the valve's response speed.

[0032] The drive shaft 81 is a hollow cylinder that runs vertically through the shaft. Its outer wall has several radial through holes 83 evenly distributed at equal intervals. The radial through holes 83 connect the hollow interior of the drive shaft 81 to the lower piston chamber. When the deluge valve is opened and the piston plate 4 moves down, the residual water in the lower piston chamber can enter the hollow interior of the drive shaft 81 through the radial through holes 83 and further drain downward into the pressure relief channel 12, thereby quickly emptying the water accumulated in the lower chamber and preventing residual water from stagnating and causing the piston plate 4 to be obstructed or water hammer to occur when it moves down. At the same time, it reduces the deposition of scale at the bottom of the chamber.

[0033] The top of the drive shaft 81 is provided with a first limiting protrusion 84 that fixes one end of the helical spring 10. The outer diameter of the first limiting protrusion 84 is adapted to the inner diameter of the helical spring 10. The lower end of the helical spring 10 is sleeved on the first limiting protrusion 84 to achieve radial positioning. The bottom of the locking boss in the axial channel of the piston rod 5 is provided with a downwardly extending second limiting protrusion 52. The outer diameter of the second limiting protrusion 52 is adapted to the inner diameter of the helical spring 10. The upper end of the helical spring 10 is sleeved on the second limiting protrusion 52. Through the double-sided limiting of the first limiting protrusion 84 and the second limiting protrusion 52, the helical spring 10 always maintains coaxiality with the piston rod 5 and the drive shaft 81 during compression and recovery, effectively preventing the spring from tilting, twisting or even falling off, and improving the reliability and stability of the mechanism operation.

[0034] The piston chamber 3 is connected to a water supply pipe 11 and a pressure relief channel 12 at its left and right ends, respectively. The piston plate 4 divides the internal space of the piston chamber 3 into two independent chambers, an upper chamber located above the piston plate 4 and connected to the water supply pipe 11 for introducing pressurized water. The lower chamber located below the piston plate 4 is connected to the atmosphere through the pressure relief channel 12 for releasing pressure. Under normal conditions, the upper chamber remains unpressurized, the lower chamber is connected to the atmosphere, the piston plate 4 is in the upper position under the action of the helical spring, the valve disc 6 presses against the valve seat, and the deluge valve remains closed. When the fire protection system is activated, the control device opens the solenoid valve or manual valve on the water supply pipe 11, and high-pressure water quickly fills the upper chamber. The water and air in the lower chamber are rapidly depressurized through the pressure relief channel 12, creating a pressure difference between the upper and lower sides of the piston plate 4. Under the action of the water supply pressure, the piston plate 4 moves rapidly downward, driving the valve disc 6 to open, allowing water to flow into the fire extinguishing network.

[0035] Since the scraping assembly 7 is located at the bottom of the piston plate 4 and moves with the piston plate 4, each time the valve is opened and closed, the scraper blade 72 will generate a rotating scraping and axial shearing motion relative to the inner wall of the piston chamber 3, which will promptly remove the deposits that may be deposited on the inner wall during valve closure, ensuring that the piston plate 4 can slide smoothly during the next action, and ensuring that the deluge valve can be reliably opened in an emergency.

[0036] Any aspects of this invention not described in detail are well-known to those skilled in the art.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A pressurized piston-type deluge alarm valve, the structure of which includes: The upper valve body (1) and the lower valve body (2), and the piston cavity (3) fixed between the upper valve body (1) and the lower valve body (2), the piston cavity (3) is provided with a piston plate (4), the top of the piston plate (4) has a piston rod (5) slidably connected to the top of the piston cavity (3), the top of the piston rod (5) is provided with a valve disc (6) for controlling the opening and closing of the rain shower valve, characterized in that: the bottom of the piston plate (4) is provided with a scraping assembly (7) for scraping off the deposits attached to the inner wall of the piston cavity (3); the scraping assembly (7) includes an annular scraper frame (71) coaxially arranged at the bottom of the piston plate (4), and a plurality of scraper blades (72) are evenly distributed at equal intervals on its outer edge, the outer side of each scraper blade (72) is closely attached to the inner wall of the piston cavity (3), the piston cavity (3) is provided with a first driving mechanism (8) that drives the annular scraper frame (71) to rotate synchronously when it moves up and down with the piston plate (4), so as to realize the circumferential scraping of the deposits on the inner wall of the piston cavity (3); the first driving mechanism (8) Includes a drive shaft (81) coaxially arranged with the piston rod (5), the drive shaft (81) being fixed to the bottom of the piston chamber (3); the bottom of the piston plate (4) is provided with a central through hole (41) through which the drive shaft (81) passes, the piston rod (5) forming an axial channel communicating with the central through hole (41) and slidingly engaging with the drive shaft (81); the annular scraper holder (71) has an inner annular sleeve (711) sleeved in the central through hole (41), the inner wall of which is provided with There are several inclined grooves (712) arranged at equal intervals along the circumference, and the upper and lower ends of two adjacent inclined grooves (712) are on the same vertical line; the outer wall of the transmission shaft (81) is provided with several protruding teeth (82) that match the inclined grooves (712) at equal intervals from top to bottom, and the axial distance between two adjacent upper and lower protruding teeth (82) is equal to the height of the inclined grooves (712); the inner wall of the axial channel of the piston rod (5) is uniformly formed with guide grooves (51) that slide and mesh with the protruding teeth (82).

2. The pressurized piston-type deluge alarm valve as described in claim 1, characterized in that: The piston plate (4) is provided with an annular groove (42) for rotating and positioning the annular scraper holder (71). The annular scraper holder (71) has an outer convex ring (713) that matches the annular groove (42). The scraper blade (72) includes a blade body (721) at the bottom of the outer convex ring (713), with its cutting edge facing the inner wall of the piston cavity (3). The top of the blade body (721) is provided with a guide post (722), and the top of the guide post (722) is provided with a limiting plate (723). The bottom of the outer convex ring (713) has a radial guide hole (714) for the guide post (722) to slide up and down. The outer convex ring (713) has a radial limiting groove (715) for the limiting plate (723) to slide up and down. It also includes a second driving mechanism (9) that drives two adjacent scraper blades (72) to form an alternating shearing trajectory along the inner wall of the piston cavity when the annular scraper holder (71) rotates.

3. The pressurized piston-type deluge alarm valve as described in claim 2, characterized in that: The second drive mechanism (9) includes a transmission link (91) located on the front and rear sides of the limiting plate (723). The outer and inner sides of the outer ring (713) are provided with guide grooves (92) for the transmission link (91) to pass through and move up and down. The inner and outer sides of the annular channel (42) are provided with guide rails (93) that cooperate with the guide grooves (92). The guide rails (93) have a continuous wave-like structure with the ends connected. The waveforms of the inner and outer guide rails (93) are synchronized. The radial distance between the peaks and troughs of the guide rails (93) is equal to the radial distance between the transmission links (91) between two adjacent scraper blades (72).

4. A pressurized piston-type deluge alarm valve as described in claim 2, characterized in that: The blade body (721) has a cutting edge with several downward-extending serrated structures.

5. A pressurized piston-type deluge alarm valve as described in claim 4, characterized in that: The piston rod (5) has a locking boss at one end of its axial channel near the valve disc (6). A helical spring (10) is sleeved inside the axial channel. The two ends of the helical spring (10) abut against the locking boss and the top of the drive shaft (81), respectively.

6. A pressurized piston-type deluge alarm valve as described in claim 5, characterized in that: The drive shaft (81) is a hollow cylinder that runs vertically through the shaft, and its outer wall has several radial through holes (83) evenly distributed at equal intervals.

7. A pressurized piston-type deluge alarm valve as described in claim 5, characterized in that: The top of the drive shaft (81) is provided with a first limiting protrusion (84) that fixes one end of the helical spring (10), and the locking protrusion of the axial channel of the piston rod (5) is provided with a second limiting protrusion (52) that fixes the other end of the helical spring (10).

8. A pressurized piston-type deluge alarm valve as described in claim 1, characterized in that: The piston chamber (3) is connected to a water supply pipe (11) and a pressure relief channel (12) at its left and right ends respectively; the piston chamber (3) is divided into two independent chambers, upper and lower, by a piston plate (4). The upper chamber is connected to the water supply pipe (11), and the lower chamber is connected to the atmosphere through the pressure relief channel (12).

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