Building fire hydrant device with blockage self-checking function
By installing flow sensors and manual self-checking mechanisms in fire hydrant devices, the problem of difficult detection of internal blockages is solved, enabling real-time monitoring and rapid self-checking of the internal flow channel status of fire hydrants, improving the immediacy and stability of water supply, and ensuring reliable water supply during fires.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HENAN HANWEI INTELLIGENT FIRE TECH CO LTD
- Filing Date
- 2026-04-23
- Publication Date
- 2026-06-19
AI Technical Summary
During long-term service, existing building fire hydrant systems are prone to rust buildup or blockage of internal channels. Manual inspections make it difficult to accurately determine the internal flow status without draining water, affecting the timeliness and flow stability of water supply.
Design a fire hydrant device with a blockage self-check function. By setting up a flow sensing mechanism, a visual feedback mechanism, and a manual self-check mechanism, the device uses a mechanical structure to achieve real-time monitoring and self-check in the absence of drainage. The device includes a sensing plate, a central connecting rod, a visual feedback mechanism, and a manual self-check mechanism. Combined with an impurity filtration structure and a flexible sealing structure, it can achieve real-time monitoring and rapid self-check of the internal flow channel status.
It improves the accuracy of monitoring the internal flow of fire hydrants and the efficiency of inspection, ensuring the timeliness and flow stability of water supply, and can still work stably in extreme fire environments, providing physical protection.
Smart Images
Figure CN122230280A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of building fire protection equipment technology, and in particular to a building fire hydrant device with a blockage self-checking function. Background Technology
[0002] Fire hydrants are the most basic and essential fixed fire-fighting facilities in building fire prevention. Connected to the fire water supply network, they provide a reliable water source for firefighting in the early stages of a fire. Based on their location, they are mainly divided into indoor and outdoor fire hydrants: Indoor fire hydrants are typically installed in hydrant boxes in public areas such as building corridors and stairwells, equipped with hoses, nozzles, and alarm buttons; outdoor fire hydrants are installed along the perimeter of the building or along fire truck access roads, and are divided into above-ground and underground types, providing a guarantee for fire trucks to obtain water or directly extinguish fires.
[0003] A complete fire hydrant system is not a single device, but a water supply network composed of water supply facilities (fire water tanks, fire pumps, elevated water tanks, pump connections), water supply pipe networks (inlet and outlet pipes, ring networks), and fire hydrant equipment. Modern buildings commonly use temporary high-pressure fire water supply systems. In the event of a fire, the elevated water tank provides initial water supply, while the fire pump automatically starts to continuously pressurize the water supply. Routine maintenance of building fire hydrants is crucial: regularly check the opening and closing of the hydrant doors, the completeness of accessories, valve leaks and corrosion, and the clarity of markings. Test the water pressure at the most unfavorable point and the automatic start function of the pump monthly, and conduct a comprehensive static pressure test annually. Only by strictly adhering to design and construction specifications and maintaining routine maintenance can we ensure that fire hydrants are readily available and usable in the event of a fire, effectively protecting life and property.
[0004] However, during long-term service, existing building fire hydrant systems are prone to buildup of impurities, rust, and debris in the internal pipes and valve seats due to water contamination. Current maintenance relies primarily on regular manual inspections and qualitative pressure monitoring. Without actual drainage testing, this method often fails to detect minor blockages inside the valve body or at the interfaces. The lack of real-time automatic monitoring and self-checking feedback mechanisms for flow patency makes it difficult for managers to promptly grasp the physical patency of the equipment. Therefore, in the event of a sudden fire, existing systems still have room for improvement in ensuring timely water supply and flow stability, and their accuracy and early warning capabilities are not high. Summary of the Invention
[0005] This invention provides a building fire hydrant device with a blockage self-check function, which aims to solve the problem that existing fire hydrants are prone to rust accumulation or impurity blockage in the internal flow channel during long-term service, and that manual inspection is difficult to accurately determine the internal unobstructed state when the water is not draining. By setting up a mechanical flow sensor and a manual simulation detection structure, the device can realize real-time monitoring and rapid self-check of the internal state of the fire hydrant.
[0006] To achieve the above objectives, the present invention provides the following technical solution: Design a building fire hydrant device with a blockage self-check function, including a main valve body, an opening and closing mechanism, a flow sensing mechanism, a visual feedback mechanism, and a manual self-check mechanism, wherein: The main valve body includes an inlet pipe section, a valve cavity, and an outlet port. The inlet pipe section is connected to the building's fire protection pipe network. A guide rail is provided on the inner wall of the valve cavity. The outlet port is located on the side of the valve cavity.
[0007] The flow sensing mechanism is installed inside the valve cavity. The flow sensing mechanism includes a sensing disk, a central connecting rod, and a return spring. The outer diameter of the sensing disk is smaller than the inner diameter of the valve cavity. Several pressure relief holes are opened on the surface of the sensing disk. The center of the sensing disk is fixedly connected to the bottom end of the central connecting rod. The central connecting rod is slidably connected to the central axis of the valve cavity through a support frame. The return spring is sleeved on the outer wall of the central connecting rod and its two ends abut against the support frame and the sensing disk, respectively. The sensing disk is displaced axially along the central connecting rod under the action of water flow impact force.
[0008] The visual feedback mechanism is installed at the top of the main valve body. The visual feedback mechanism includes a transparent sealing cover, a scale column, and an indicator slider. The top of the central connecting rod passes through the top of the main valve body and extends into the inside of the transparent sealing cover. The indicator slider is fixedly installed at the top of the central connecting rod. The scale column is fixed inside the transparent sealing cover and located next to the indicator slider. The indicator slider displays different height values on the scale column as the central connecting rod rises and falls.
[0009] The manual self-testing mechanism is installed on the side wall of the main valve body. The manual self-testing mechanism includes a test handle, a rotating shaft, and an eccentric fork. The rotating shaft passes horizontally through the wall of the main valve body. The test handle is fixedly connected to the end of the rotating shaft located outside the main valve body. The eccentric fork is fixedly connected to the end of the rotating shaft located inside the main valve body, and the actuating end of the eccentric fork is located below the induction plate. By rotating the test handle, the eccentric fork is driven to push the induction plate upward, thereby simulating the water flow propulsion process.
[0010] Furthermore, an impurity filtration structure is fixedly connected inside the water inlet pipe section of the main valve body. The impurity filtration structure includes an inclined metal filter screen and a slag collection chamber located below the metal filter screen. The lowest point of the metal filter screen is connected to the inlet of the slag collection chamber. A drain plug is threadedly connected to the bottom of the slag collection chamber. Solid particles in the fluid are guided into the slag collection chamber through the inclined metal filter screen.
[0011] Furthermore, a flexible sealing structure is provided at the part of the central connecting rod that passes through the top of the main valve body. The flexible sealing structure includes a stainless steel bellows. The bottom end of the stainless steel bellows is welded to the inner wall of the main valve body, and the top end of the stainless steel bellows is welded to the outer wall of the central connecting rod. The elastic deformation of the stainless steel bellows cooperates with the axial movement of the central connecting rod and blocks the water flow inside the valve cavity from entering the transparent sealing cover.
[0012] Furthermore, a wear-resistant guide ring is provided at the edge of the induction disk. The wear-resistant guide ring is made of polytetrafluoroethylene. The outer wall of the wear-resistant guide ring slides in conjunction with the guide rail of the inner wall of the valve cavity to maintain the axial stability of the induction disk during displacement.
[0013] Furthermore, the surface of the scale column is coated with a fluorescent indicator layer, which is divided into green, yellow and red areas. The scale column is marked with Chinese labels corresponding to different flow levels. The green area corresponds to the normal water supply state, the yellow area corresponds to the partial blockage state, and the red area corresponds to the severe blockage or valve not being opened.
[0014] Furthermore, the actuating end of the eccentric shift fork has an arc-shaped structure, and a thickened force pad is provided at the center of the bottom surface of the induction disk. The thickened force pad corresponds to the arc-shaped structure of the eccentric shift fork, reducing the frictional resistance during manual self-testing.
[0015] Furthermore, a reset torsion spring is provided on the outer side of the detection handle. The reset torsion spring is sleeved on the outer wall of the rotating shaft. One end of the reset torsion spring is fixed to the outer wall of the main valve body, and the other end is fixed to the detection handle. After the external force is lost, the reset torsion spring drives the eccentric shift fork to return to the initial position below the induction plate.
[0016] Furthermore, the inner wall of the transparent sealing cover is provided with an anti-fog coating, and the transparent sealing cover is fixed to the top of the main valve body by a pressure ring and fastening bolts. A sealing gasket is provided between the pressure ring and the main valve body.
[0017] Furthermore, the central connecting rod adopts a hollow tubular structure, and the interior of the central connecting rod is filled with shock-absorbing grease. The inner wall of the guide hole of the support frame is provided with an oil-impregnated bushing that cooperates with the central connecting rod to absorb the mechanical vibration generated by water flow fluctuations.
[0018] Furthermore, the inner wall of the water outlet is machined with internal threads, and a quick-connector seat is provided on the outside of the water outlet. The quick-connector seat is connected to a protective cover by a pin.
[0019] Furthermore, an annular protrusion is provided on the inner wall of the valve cavity above the initial position of the sensing disk. The annular protrusion and the sensing disk form a locally narrowed flow channel to increase the pressure difference between the two ends of the sensing disk under low flow rate conditions.
[0020] Furthermore, a transparent observation window is provided on the outer wall of the slag collection chamber. The transparent observation window is made of reinforced glass, through which the accumulation height of impurities inside the slag collection chamber can be observed.
[0021] The present invention has the following advantages: By setting a flow sensing mechanism inside the main valve body, the present invention utilizes the displacement change of the sensing disc under fluid impact to convert the invisible internal flow velocity into a visible mechanical displacement, which is then transmitted to the visual feedback mechanism at the top via the central connecting rod. By observing the position of the indicator slider on the scale column, the management personnel can intuitively determine the water supply capacity of the fire hydrant in the water outlet state, thereby discovering whether there is any minor blockage.
[0022] This device, through a manual self-test mechanism, allows for the verification of the sensitivity of the sensing mechanism without conducting actual drainage tests. When the detection handle is rotated, the eccentric fork lifts the sensing plate, causing the indicator slider to rise. If the resistance to rotating the handle is abnormal or the indicator slider fails to move accordingly, it indicates that there is internal corrosion, jamming, or entanglement of impurities. This physical simulation method greatly improves the efficiency and accuracy of daily inspections.
[0023] Furthermore, the impurity filtration structure within the inlet pipe section, in conjunction with the slag collection chamber, actively captures large particles of debris in the pipe network, reducing the risk of valve seats and sensing mechanisms becoming stuck. The flexible sealing structure utilizes stainless steel bellows, achieving lossless transmission of the central connecting rod while completely eliminating the possibility of high-pressure water leakage, thus extending the service life of the visual feedback mechanism. The entire structure operates entirely on mechanical principles, without relying on an electrical system, and can maintain stable operation even in extreme fire environments, providing a solid physical guarantee for building fire safety. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal cross-sectional structure of the present invention; Figure 3 This is a partially enlarged schematic diagram of the flow sensing mechanism according to an embodiment of this application; Figure 4 This is a schematic diagram of the visual feedback mechanism structure according to an embodiment of this application; In the diagram, 1. Main valve body; 2. Inlet pipe section; 3. Valve cavity; 4. Outlet port; 5. Guide rail; 6. Annular protrusion; 7. Induction disc; 8. Pressure relief hole; 9. Central connecting rod; 10. Return spring; 11. Support frame; 12. Wear-resistant guide ring; 13. Thickened force pad; 14. Transparent sealing cover; 15. Scale column; 16. Indicator slider; 17. Fluorescent indicator layer; 18. Detection handle; 19. Rotating shaft; 20. Eccentric fork; 21. Return torsion spring; 22. Stainless steel bellows; 23. Metal filter screen; 24. Slag collection chamber; 25. Sewage drain plug; 26. Transparent observation window; 27. Quick coupling seat; 28. Protective cover; 29. Anti-fog coating; 30. Pressure ring; 31. Fastening bolt; 32. Sealing gasket. Detailed Implementation To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0025] Therefore, the following detailed description of the embodiments of the 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 invention without inventive effort are within the scope of protection of the invention.
[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.
[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0029] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0030] Please see Figures 1 to 4 The present invention provides a technical solution: a building fire hydrant device with a blockage self-checking function. This device is applied to a building fire water supply system and realizes real-time monitoring of the unobstructed flow of the internal flow channel and manual verification in the state of no drainage through a mechanical structure.
[0031] The main valve body 1 constitutes the main support and fluid passage of the entire device. One end of the main valve body 1 is provided with a water inlet pipe section 2, which is connected to the building's internal fire-fighting constant pressure pipe network via a flange structure. The main valve body 1 has a relatively large valve chamber 3 inside, the cross-sectional diameter of which is larger than the inner diameter of the water inlet pipe section 2. A water outlet port 4 is located on the side wall of the valve chamber 3, with its axis perpendicular to the axis of the water inlet pipe section 2. A quick-connect fitting seat 27 is installed on the outside of the water outlet port 4, and a protective cover 28 is connected to the outer end of the quick-connect fitting seat 27 via a pin to cover the water outlet passage when not in use. Four guide rails 5 are symmetrically arranged along the axial direction on the inner wall of the valve chamber 3. The guide rails 5 have a rectangular cross-section and their surfaces are coated with a friction-reducing coating. On the inner wall of the valve cavity 3 near the water inlet pipe section 2, there is a ring-shaped protrusion 6. The inner diameter of the ring-shaped protrusion 6 is smaller than that of the rest of the valve cavity 3, thereby forming a local narrowing flow channel above the initial position of the sensing disk 7, which increases the local dynamic pressure when the fluid passes through.
[0032] Please see Figure 2 and Figure 3The flow sensing mechanism is installed in the central area of the valve cavity 3. The flow sensing mechanism includes a sensing disk 7, which is made of stainless steel and has an outer diameter slightly smaller than the inner diameter of the valve cavity 3. A wear-resistant guide ring 12 is nested around the circumferential edge of the sensing disk 7. The wear-resistant guide ring 12 is made of polytetrafluoroethylene (PTFE), and its outer side has a groove that matches the guide rail 5, thus restricting the sensing disk 7 to reciprocate only along the axial direction of the valve cavity 3. Eight pressure relief holes 8 are evenly distributed on the surface of the sensing disk 7 in a ring shape, used to balance part of the static pressure before and after the sensing disk in a static state. A central connecting rod 9 is fixedly connected to the geometric center of the sensing disk 7, and the central connecting rod 9 extends upward. A support frame 11 is fixed inside the valve cavity 3 by a bracket. A guide hole is opened at the center of the support frame 11, and the central connecting rod 9 passes through the guide hole of the support frame 11 and slides with it. A return spring 10 is sleeved on the outer wall of the central connecting rod 9 between the support frame 11 and the induction disk 7. The return spring 10 is in a pre-compressed state, with its bottom end abutting against the top surface of the induction disk 7 and its top end abutting against the bottom surface of the support frame 11, thereby providing a downward initial return force to the induction disk 7. A thickened force-bearing pad 13 is welded to the center of the bottom surface of the induction disk 7, and the bottom surface of the thickened force-bearing pad 13 is processed into a hardened plane.
[0033] Please see Figure 2 and Figure 4 The visual feedback mechanism is installed at the top of the main valve body 1. A through hole is provided on the top surface of the main valve body 1, through which the top end of the central connecting rod 9 enters the visual feedback area. To prevent high-pressure water from leaking out of the valve chamber 3 through this through hole, a flexible sealing structure is provided at the connection between the central connecting rod 9 and the main valve body 1. The flexible sealing structure includes a stainless steel bellows 22, which has excellent axial expansion and contraction performance. The bottom edge of the stainless steel bellows 22 is fully welded to the inner top wall of the main valve body 1, and the top edge of the stainless steel bellows 22 is fully welded to the outer peripheral wall of the central connecting rod 9. This welding structure forms a completely closed isolation cavity, converting the axial movement of the central connecting rod 9 into the folding deformation of the stainless steel bellows 22, thereby completely blocking the path of fluid overflow to the external feedback mechanism without affecting the mechanical transmission.
[0034] The visual feedback mechanism is covered by a transparent sealing cover 14, which is made of high-strength polycarbonate material and has good light transmittance and impact resistance. The bottom end of the transparent sealing cover 14 is fixed to the top flange of the main valve body 1 by a pressure ring 30 and multiple fastening bolts 31, and a sealing gasket 32 is held between the pressure ring 30 and the main valve body 1. The inner wall of the transparent sealing cover 14 is coated with an anti-fog coating 29 to prevent water vapor caused by temperature difference from obscuring the view. A scale column 15 is fixed inside the transparent sealing cover 14, and the scale column 15 is marked with flow rate scale values. An indicator slider 16 is fixedly installed at the top of the central connecting rod 9, and the surface of the scale column 15 is coated with a fluorescent indicator layer 17. The fluorescent indicator layer 17 is divided into three color areas from bottom to top: a red area at the bottom, a yellow area in the middle, and a green area at the top. When there is no fluid flow inside the main valve body 1 or the flow rate is extremely low, the indicator slider 16 is in the red area of the scale column 15; when the flow rate reaches the standard requirement, the indicator slider 16 rises to the green area.
[0035] Please see Figure 2 The manual self-testing mechanism is installed on the side of the main valve body 1. The manual self-testing mechanism includes a test handle 18, which is located outside the main valve body 1. The test handle 18 is fixedly connected to one end of a rotating shaft 19, which extends through the side wall of the main valve body 1 into the valve cavity 3, and a dynamic sealing ring is provided between the rotating shaft and the valve wall. An eccentric fork 20 is fixedly connected to the end of the rotating shaft 19 inside the valve cavity 3. The actuating end of the eccentric fork 20 has an arc-shaped curved surface structure, and in the initial state, the eccentric fork 20 is located directly below the thickened force pad 13 below the sensing disc 7, maintaining a mechanical gap of two to five millimeters between them. A return torsion spring 21 is sleeved on the rotating shaft 19 outside the main valve body 1. One end of the return torsion spring 21 is fixed to the valve body, and the other end is fixed to the test handle 18, driving the test handle 18 to always tend to return to the initial horizontal position.
[0036] The inlet pipe section 2 also integrates an impurity filtration structure. This structure includes a metal filter screen 23, which is installed at a 45-degree angle to the horizontal plane inside the inlet pipe section 2. The bottom end of the metal filter screen 23 extends to an opening at the bottom of the inlet pipe section 2, below which is a sludge collection chamber 24. The sludge collection chamber 24 has a funnel-shaped structure, with a drain plug 25 at its bottom, which is threaded to the chamber. A transparent observation window 26, made of tempered glass, is embedded in the side wall of the sludge collection chamber 24, allowing inspectors to observe the amount of impurities accumulated inside. When water carrying solid particles enters the inlet pipe section 2, the metal filter screen 23 intercepts the particles and guides them into the sludge collection chamber 24 using its angled design, preventing particles from entering the valve chamber 3 and causing the sensing disc 7 to jam.
[0037] The working process of this invention is as follows: 1. In normal standby mode, the main valve body 1 is filled with static pressure water. Due to the lack of fluid flow, the sensing disc 7 is in its initial bottom position driven by the spring force of the reset spring 10. At this time, the central connecting rod 9 drives the top indicator slider 16 to the lowermost red area of the scale column 15, indicating that there is currently no water supply output. The inspection personnel can check the sludge accumulation in the sludge collection chamber 24 through the transparent observation window 26. If there are many impurities, the drain plug 25 is unscrewed for cleaning.
[0038] 2. When a fire occurs and a fire hydrant is needed, open the externally connected fire valve. Water flows in from the inlet pipe section 2 and passes through the narrowed flow channel formed by the annular protrusion 6. The fluid exerts impact pressure on the bottom surface of the induction plate 7. Due to the pressure difference between the top and bottom of the induction plate 7, the induction plate 7 overcomes the resistance of the return spring 10 and moves upward. The wear-resistant guide ring 12 slides along the guide rail 5 to maintain smooth movement. The rise of the induction plate 7 causes the central connecting rod 9 to rise synchronously, and the stainless steel corrugated pipe 22 is stretched accordingly. The indicator slider 16 rises with the central connecting rod 9 inside the transparent sealing cover 14. If the flow channel is unobstructed and the pressure is sufficient, the indicator slider 16 will reach the green area of the scale column 15; if there is some internal corrosion or blockage causing insufficient flow rate, the indicator slider 16 can only reach the yellow area, thus providing managers with intuitive fault warnings.
[0039] III. During non-drainage inspections, inspectors manually check the sensitivity and flow of the device. The inspector holds the detection handle 18 and rotates it 90 degrees upwards or downwards. The rotating shaft 19 drives the eccentric fork 20 to rotate within the valve chamber 3. The arc-shaped end of the eccentric fork 20 pushes upwards against the thickened force pad 13, forcibly driving the induction disc 7 upwards, simulating the process of water flow. At this time, the inspector observes whether the indicator slider 16 can smoothly rise and fall synchronously with the rotation of the detection handle 18. If significant resistance is felt when rotating the detection handle 18, or if the indicator slider 16 becomes stuck or cannot reset, it indicates that there is foreign matter obstructing the valve chamber 3 or that the central connecting rod 9 is corroded and stuck, requiring immediate disassembly and repair. After the self-test is completed, the detection handle 18 is released. Under the action of the reset torsion spring 21, the manual self-test mechanism automatically returns to its original position, without affecting normal fire-fighting functions.
[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A building fire hydrant device with a self-checking function for blockage, characterized in that: It includes the main valve body (1), the flow sensing mechanism, the visual feedback mechanism, and the manual self-test mechanism, wherein: The main valve body (1) includes an inlet pipe section (2), a valve chamber (3) and an outlet port (4), and the inner wall of the valve chamber (3) is provided with a guide slide rail (5). The flow sensing mechanism is installed inside the valve cavity (3). The flow sensing mechanism includes a sensing disk (7), a central connecting rod (9), and a return spring (10). The outer periphery of the sensing disk (7) is slidably connected to the guide rail (5). A pressure relief through hole (8) is opened on the surface of the sensing disk (7). The sensing disk (7) is fixedly connected to the bottom end of the central connecting rod (9). The central connecting rod (9) is slidably connected to the valve cavity (3) through a support frame (11). The return spring (10) is sleeved on the outer wall of the central connecting rod (9) and its two ends abut against the support frame (11) and the sensing disk (7) respectively. The visual feedback mechanism is installed at the top of the main valve body (1). The visual feedback mechanism includes a transparent sealing cover (14), a scale column (15), and an indicator slider (16). The top of the central connecting rod (9) extends into the interior of the transparent sealing cover (14) and is fixedly connected to the indicator slider (16). The manual self-testing mechanism is installed on the side wall of the main valve body (1). The manual self-testing mechanism includes a test handle (18), a rotating shaft (19), and an eccentric fork (20). The rotating shaft (19) passes through the wall of the main valve body (1). The test handle (18) is fixedly connected to one end of the rotating shaft (19) located outside the main valve body (1). The eccentric fork (20) is fixedly connected to one end of the rotating shaft (19) located inside the main valve body (1), and the actuating end of the eccentric fork (20) is located below the induction plate (7).
2. A building fire hydrant device with a self-checking function for clogging as described in claim 1, characterized in that: The main valve body (1) has an impurity filtration structure fixedly connected inside the water inlet pipe section (2). The impurity filtration structure includes an inclined metal filter screen (23) and a slag collection chamber (24) located below the metal filter screen (23). The lowest point of the metal filter screen (23) is connected to the inlet of the slag collection chamber (24). The bottom of the slag collection chamber (24) is threadedly connected to a drain plug (25).
3. A building fire hydrant device with a self-checking function for clogging as described in claim 1, characterized in that: The central connecting rod (9) is provided with a flexible sealing structure at the part that passes through the top of the main valve body (1). The flexible sealing structure includes a stainless steel bellows (22). The bottom end of the stainless steel bellows (22) is connected to the inner wall of the main valve body (1), and the top end of the stainless steel bellows (22) is connected to the outer wall of the central connecting rod (9).
4. A building fire hydrant device with a self-checking function for clogging as described in claim 1, characterized in that: A wear-resistant guide ring (12) is provided at the edge of the induction disk (7). The outer wall of the wear-resistant guide ring (12) is slidably engaged with the guide rail (5) on the inner wall of the valve cavity (3). The wear-resistant guide ring (12) is made of polytetrafluoroethylene.
5. A building fire hydrant device with a self-checking function for clogging as described in claim 1, characterized in that: The surface of the scale post (15) is coated with a fluorescent indicator layer (17), and the scale post (15) is fixed inside the transparent sealing cover (14) and located next to the indicator slider (16).
6. A building fire hydrant device with a self-checking function for clogging as described in claim 1, characterized in that: The actuating end of the eccentric fork (20) has an arc-shaped structure, and a thickened force pad (13) is provided at the center of the bottom surface of the induction disk (7). The thickened force pad (13) corresponds to the arc-shaped structure of the eccentric fork (20).
7. A building fire hydrant device with a self-checking function for clogging as described in claim 1, characterized in that: A reset torsion spring (21) is provided on the outside of the detection handle (18). The reset torsion spring (21) is sleeved on the outer wall of the rotating shaft (19). One end of the reset torsion spring (21) is fixed to the outer wall of the main valve body (1), and the other end is fixed to the detection handle (18).
8. A building fire hydrant device with a self-checking function for clogging as described in claim 1, characterized in that: The inner wall of the valve chamber (3) is provided with an annular protrusion (6) above the initial position of the sensing disk (7).