Anti-seismic indoor fire hydrant

Abstract

The invention relates to the technical field of fire-fighting equipment, in particular to an anti-seismic indoor fire hydrant which comprises a valve body. The valve clack is arranged in the water inlet cavity; the middle part of the valve rod is connected with the valve body through threads, the upper part is connected with the hand wheel and the lower part is movably connected with the valve clack; the safety pin penetrates through pin holes of the valve body and the valve rod; the circlip II for the hole is arranged between the inner hole of the valve clack and the valve rod; the inter-shaft radial sealing structure comprises a rigid sealing ring installed on the valve clack, a pressing plate fixedly connected with the lower end of the valve clack, a locking nut for locking the valve clack and the pressing plate, and a cotter pin arranged on the lower side surface of the valve clack. The pressure reducing and stabilizing assembly is arranged in the water outlet cavity; the valve body is integrally cast through the copper alloy, threaded connection points between the valve deck and the valve body and between the connector and the valve body are completely eliminated, the risk of thread stress concentration and vibration slippage caused by nuclear power safety shutdown seismic loads is solved through the design, and the structural integrity of the valve in the extreme vibration environment is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fire-fighting facilities, and particularly relates to an anti-seismic indoor fire hydrant. BACKGROUND

[0002] As the core equipment of the fire-fighting system, the indoor fire hydrant undertakes the task of fire extinguishing in civil buildings and industrial facilities, and in special application scenarios such as nuclear power and ships, the equipment needs to meet the safety and reliability standards far exceeding those of conventional places, especially the requirements of resisting strong seismic load and radiation resistance.

[0003] At present, important facilities such as domestic nuclear power plants rely on imported anti-seismic fire hydrants, but there are significant differences between their technical parameters and the national standards of China, which cannot meet the mandatory provisions such as the Technical Code for Fire Water Supply and Fire Hydrant System. This technical disconnection not only leads to compliance risks, but also fundamentally conflicts with the strategy of domestic production of nuclear power equipment in China.

[0004] Therefore, in view of the above problems, the present application provides an anti-seismic indoor fire hydrant, which is specially developed in combination with the special requirements of nuclear power places, adopts a series of anti-seismic and radiation-resistant performance design, and fully meets the use requirements in the field of nuclear power, and can completely replace imported products. SUMMARY

[0005] In order to overcome the problem that the performance of the existing anti-seismic fire hydrant deviates greatly from the national standard of China, the present application provides an anti-seismic indoor fire hydrant.

[0006] The technical scheme of the present application is as follows: an anti-seismic indoor fire hydrant, comprising:

[0007] a valve body containing a water inlet cavity, a water outlet cavity and an integrated fire-fighting interface;

[0008] a valve clack arranged in the water inlet cavity;

[0009] a valve stem, the middle part of which is connected with the valve body through threads, the upper part of which is connected with a hand wheel, and the lower part of which is movably connected with the valve clack;

[0010] a safety pin penetrating through pin holes of the valve body and the valve stem;

[0011] a second hole elastic retainer installed between the inner hole of the valve clack and the valve stem to limit the rotation of the valve clack;

[0012] an inter-shaft radial sealing structure, comprising a rigid sealing ring installed on the valve clack, a pressing plate fixedly connected with the lower end of the valve clack, a locking nut locking the valve clack and the pressing plate, and a split pin arranged on the lower surface of the valve clack;

[0013] a pressure reduction and stabilization assembly arranged in the water outlet cavity, comprising a pressure reduction hole plate installed on one side of the water outlet cavity, a spring seat and a first hole elastic retainer installed on the other side of the water outlet cavity, and a spring installed on the spring seat.

[0014] As preferred, the upper part of the valve rod is provided with an elastic shaft retainer and a flat washer, and the valve rod is fixed by the elastic shaft retainer and the flat washer.

[0015] As preferred, the connection structure of the valve disc and the valve rod is that the valve disc inner hole is gap fitted with the valve rod, and is axially limited by the elastic hole retainer II, so that the valve disc only moves axially when the valve rod rotates.

[0016] As preferred, the installation mode of the pressure reduction assembly is that the pressure reduction hole plate, the spring and the spring seat are sequentially installed into the water outlet cavity, and the end is fixed by the elastic hole retainer I.

[0017] As preferred, the pressure reduction hole plate is provided with a main drainage port and a side drainage port, when the water pressure is lower than the threshold value, the spring pushes the pressure reduction hole plate away from the spring seat, and the water flow is reduced through the double-channel pressure reduction of the main and side drainage ports; when the water pressure is higher than the threshold value, the spring is compressed to make the pressure reduction hole plate adhere to the spring seat, the side drainage port is closed, and the water flow is reduced through the single-channel pressure reduction of the main drainage port.

[0018] As preferred, the valve rod is provided with two elastic shaft O-shaped sealing rings, which are respectively located at the upper and lower ends of the threaded connection section, to realize dynamic sealing of the valve rod.

[0019] As preferred, the valve body is made of copper alloy casting, the valve rod and the movable part are made of stainless steel, the elastic shaft retainer, the flat washer, the elastic shaft O-shaped sealing ring, the elastic hole retainer I, the rigid sealing ring and the elastic hole retainer II are made of radiation-resistant silicone rubber, and the valve rod and the remaining parts are made of stainless steel.

[0020] As preferred, the rigid sealing ring is a composite structure with an inner steel ring and an outer rubber sealing layer.

[0021] As preferred, the pressure reduction assembly is detachable and replaceable, after the elastic hole retainer I is removed, different specifications of springs, spring seats or pressure reduction hole plates can be replaced.

[0022] As preferred, the fire hydrant further comprises an anti-seismic ordinary type not containing the pressure reduction assembly and the elastic hole retainer I.

[0023] The beneficial effects of the present application are:

[0024] 1. By adopting copper alloy integral casting of the valve body, the valve cover, the fire fighting interface and the valve body in the traditional fire hydrant are solidified into a single structure, and the threaded connection points between the valve cover and the valve body and between the interface and the valve body are completely eliminated. This design solves the threaded stress concentration and vibration slip risk caused by the earthquake load of nuclear safety shutdown, avoids the sealing damage or pipe rupture caused by connection failure, and significantly improves the structural integrity of the valve in the extreme vibration environment.

[0025] 2. The valve body is integrally cast to ensure that the valve rod mounting cavity and the valve disc running track are strictly coaxial, and the gap design of the valve disc inner hole and the valve rod light rod section and the axial limiting effect of the hole elastic retainer ring force the valve disc to move only along a straight track, thereby effectively overcoming the misalignment of the mechanism caused by the cumulative assembly error of the traditional split valve body, and still maintaining the uniform fit of the valve disc and the sealing surface under the seismic multi-directional vibration load, avoiding the failure of emergency operation caused by opening and closing jamming or partial wear. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A schematic diagram of the anti-seismic type indoor fire hydrant structure of the present application is shown.

[0027] Figure 2 A schematic diagram of the anti-seismic type ordinary indoor fire hydrant structure of the present application is shown.

[0028] Figure 3 A schematic diagram of the valve body internal structure of the present application is shown.

[0029] Figure 4 A schematic diagram of the hand wheel structure of the present application is shown.

[0030] Figure 5 A schematic diagram of the drain port structure of the present application is shown.

[0031] BRIEF DESCRIPTION OF DRAWINGS: 1, hand wheel; 2, shaft elastic retainer ring; 3, flat washer; 4, safety pin; 5, O-ring; 6, hole elastic retainer ring I; 7, spring; 8, spring seat; 9, pressure relief hole plate; 10, valve body; 11, rigid seal ring; 12, pressure plate; 13, locking nut; 14, split pin; 15, valve disc; 16, valve rod; 17, hole elastic retainer ring II. DETAILED DESCRIPTION

[0032] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Please refer to Figures 1-5 The present application provides an embodiment: an anti-seismic type indoor fire hydrant, comprising:

[0034] The valve body 10 comprises a water inlet cavity, a water outlet cavity and an integrated fire fighting interface;

[0035] The valve disc 15 is arranged in the water inlet cavity;

[0036] Valve stem 16, middle part is connected with valve body 10 through thread, upper part is connected with hand wheel 1, lower part is movably connected with valve disc 15;

[0037] Safety pin 4, which is through the pin hole of valve body 10 and valve stem 16;

[0038] Hole elastic retainer 2 17 is installed between the inner hole of valve disc 15 and valve stem 16, and limits the rotation of valve disc 15;

[0039] The inter-shaft radial sealing structure comprises a rigid sealing ring 11 installed on the valve disc 15, a pressing plate 12 fixedly connected to the lower end of the valve disc 15, a locking nut 13 for locking the valve disc 15 and the pressing plate 12, and an open pin 14 arranged on the lower side surface of the valve disc 15.

[0040] The pressure reducing and stabilizing assembly is arranged in the water outlet cavity and comprises a pressure reducing hole plate 9 arranged on one side of the water outlet cavity, a spring seat 8 and a hole elastic retainer 1 6 arranged on the other side of the water outlet cavity, and a spring 7 arranged on the spring seat 8.

[0041] Further, the valve body 10 is integrally cast by using copper alloy, the valve cover and the fire-fighting interface in the conventional fire hydrant are solidified into a single casting with the valve body, and the inherent defects caused by the threaded connection between the valve cover, the fire-fighting interface and the valve body 10 in the traditional design are completely eliminated.

[0042] Further, the traditional split type valve body is prone to accumulated assembly errors, which can cause the motion trajectory of the valve stem 16 and the valve disc 15 to deviate, and the valve disc 15 is prone to jamming under vibration conditions.

[0043] Further, different from the end face extrusion type sealing of the conventional fire hydrant, the sealing gasket is easily displaced and fails due to vibration, and the application adopts the shaft radial sealing structure below the valve disc 15, which is composed of the rigid sealing ring 11, the pressing plate 12 and the locking nut 13: the rigid sealing ring 11 adopts the composite design of the embedded steel framework, and is covered with the radiation-resistant silicone rubber layer, which can ensure the elastic sealing force and sufficient rigidity, and will not cause the sealing ring to fall off under the water flow impact, the pressing plate 12 is radially pressed to the valve disc 15 circumferential groove by the locking nut 13, and forms the annular line contact with the sealing surface of the valve body 10, and the structure can self-adaptively compensate the micro displacement of the sealing surface under the vibration load.

[0044] Further, the hole elastic check ring two 17 is additionally arranged between the inner hole of the valve disc 15 and the valve rod 16, when the valve rod 16 rotates, the hole elastic check ring two 17 limits the circumferential freedom of the valve disc 15, and forces the valve disc 15 to move only along the axial direction of the valve rod 16, the design eliminates the possibility that the valve disc 15 rotates with the valve rod 16, and ensures that the sealing surface of the valve disc 15 always keeps parallel with the sealing surface of the valve body 10, in the multi-directional vibration caused by the earthquake, the structure can effectively inhibit the self-rotation tendency of the valve disc 15 due to the inertia moment, and improves the sealing structure performance of the valve disc 15.

[0045] Further, the safety pin 4 arranged between the valve rod 16 and the valve body 10 can ensure that the valve rod 16 does not rotate during the vibration, and further solves the situation that the sealing failure of the valve disc 15 occurs, when the valve needs to be opened, the safety pin 4 needs to be manually removed.

[0046] Further, the pressure reducing and stabilizing assembly is clamped and fixed to the end of the water outlet cavity of the valve body 10 through the hole elastic check ring one 6, and forms the modular assembly without threaded connection, the structure has three anti-vibration advantages: first, the radial clamping force of the hole elastic check ring one 6 can inhibit the axial movement of the assembly; second, the spring 7 itself can absorb the water flow pulsation energy; third, the double-channel design of the pressure reducing hole plate 9 realizes dynamic pressure stabilization through the cooperation of the main drain port and the side drain port and the pre-tightening force of the spring 7, when the water pressure is low, the spring 7 expands the pressure reducing hole plate 9, the double-channel flow maintains the lower limit of the pressure, when the water pressure is high, the spring 7 is compressed to make the hole plate adhere to the spring seat 8, and the side drain port is closed, the single-channel throttling controls the upper limit of the pressure, the design can still stably output the set pressure under the vibration working condition, and the assembly can be quickly replaced by removing the hole elastic check ring one 6, which adapts to different working conditions.

[0047] Further, the valve body 10 is made of cast copper alloy ZCuSn10Zn2 or ZCuZn16Si4, which has high strength and excellent corrosion resistance, the movable parts such as the valve rod 16 are made of HPb59-1 lead brass or stainless steel, which can ensure the long-term service anti-wear and corrosion resistance, and the sealing ring is made of radiation-resistant silicone rubber, and the material system can solve the problems of radiation aging, seawater corrosion and high temperature and high pressure in the nuclear power plant.

[0048] Please refer to Figure 1 , the invention is a manual control valve, by the lowest end of the threaded valve body 10 is installed in the indoor fire hydrant system pipeline, the pipeline is always kept under pressure fire water supply, fire hydrant valve is closed, to ensure that the water pressure maintained at the lower end of the sealing part of the valve 15, when a fire, fire personnel manually open the fire hydrant valve, fire water through the connected fire hose and gun to implement water fire fighting, fire fighting need to be closed manually fire hydrant valve.

[0049] The opening and closing of the valve, through the rotation of the hand wheel 1, before opening the valve, first remove the safety pin 4, anticlockwise rotation of the hand wheel 1 until the block will be fully open the valve, rotating the hand wheel 1 will drive the valve stem 16, through the trapezoidal thread pair on the valve stem 16, drive the valve 15, rigid sealing ring 11, pressing plate 12, locking nut 13 and cotter pin 14 upward movement, and then open the valve, reverse the hand wheel 1 and valve stem 16, can realize the closing of the valve.

[0050] Among them, spring 7, spring seat 8, pressure reducing hole plate 9 is the core control component of pressure reducing and stabilizing characteristics, installed in the outlet end of the valve, through the hole with elastic retainer 6 fixed by position, not only easy to install, and the structure has good anti shock performance, when the pressure reducing and stabilizing characteristics of the valve needs to be adjusted, can be disassembled hole with elastic retainer 6, replace the appropriate spring 7, spring seat 8, pressure reducing hole plate 9 can realize the adjustment.

[0051] Please refer to Figure 2 , the embodiment is an anti shock type ordinary indoor fire hydrant, according to the actual demand, when the fire hydrant valve does not need to use the pressure reducing and stabilizing function, no spring 7, spring seat 8, pressure reducing hole plate 9, hole with elastic retainer 6 is configured.

[0052] Further, the working process of the present application is described:

[0053] When the fire hydrant is in the quasi working state, the pipeline is full of fire water with pressure, the valve 15 is tightly combined with the sealing surface of the valve body 10 under the driving of the thread of the valve stem 16, forming an axial sealing structure, at this time, the radial compression force of the rigid sealing ring 11 is generated under the fixation of the pressing plate 12 and the locking nut 13, ensuring that the water flow cannot penetrate into the valve body 10, the safety pin 4 is inserted into the through pin hole of the valve body 10 and the valve stem 16 to form mechanical interlocking, resisting the accidental rotation of the valve stem 16 caused by earthquake, the pressure reducing and stabilizing assembly is in standby state, the spring 7 is in pre compression position, and the main drain port and the side drain port of the pressure reducing hole plate 9 are communicated with the water outlet cavity.

[0054] When the hydrant needs to be opened, the operator first manually removes the safety pin 4, releases the rotation restriction of the valve stem 16, rotates the hand wheel 1 counterclockwise, thereby driving the valve stem 16 to rotate synchronously, the trapezoidal thread pair in the middle of the valve stem 16 drives the valve disc 15 to move upward along the axial direction, so that the valve disc 15 is separated from the sealing surface of the valve body 10, the fire-fighting water flows from the water inlet chamber to the water outlet chamber through the flow channel formed by the opening of the valve disc 15, and the valve stem 16 rotates until it is limited by the internal thread of the valve body 10, at this time the valve reaches the fully open state. During the opening process, the two O-shaped sealing rings 5 on the valve stem 16 dynamically seal the gap between the valve stem 16 and the valve body 10, preventing water leakage along the valve stem 16.

[0055] If the hydrant is equipped with a pressure reduction and pressure stabilization assembly, when the water flow enters the water outlet chamber, it impacts the pressure reduction hole plate 9:

[0056] At low pressure, when the inlet water pressure is lower than the set threshold, the pre-tightening force of the spring 7 is greater than the water pressure, pushing the pressure reduction hole plate 9 away from the spring seat 8, and the water flow flows out through the main drainage port and the side drainage port of the pressure reduction hole plate 9, expanding the flow area to maintain the outlet pressure not lower than the lower limit value.

[0057] At high pressure, when the inlet water pressure exceeds the set threshold, the water pressure compresses the spring 7, making the pressure reduction hole plate 9 adhere to the spring seat 8, and the side drainage port is closed by the spring seat 8, and the water flow only flows out through the main drainage port, limiting the outlet pressure not to exceed the upper limit value.

[0058] The fire-fighting water flows out from the fire-fighting interface of the valve body 10 through the pressure reduction and pressure stabilization assembly, the operator connects the fire-fighting hose and the spray gun to implement fire extinguishing, after the fire extinguishing is completed, the hand wheel 1 is rotated clockwise, driving the valve stem 16 to rotate and pushing the valve disc 15 to move downward along the axial direction, until the valve disc 15 presses the sealing surface of the valve body 10 to cut off the water flow, after confirming that the valve is completely closed, the safety pin 4 is reinserted into the pin hole of the valve stem 16 and the valve body 10, restoring the anti-shock locking state.

[0059] If the hydrant is not equipped with a pressure reduction and pressure stabilization assembly, its operation process is consistent with the above steps, but the water outlet chamber has no pressure reduction structure, the water flow directly flows from the water inlet chamber to the fire-fighting interface, the outlet pressure is the same as the pipe network pressure, and it is suitable for non-pressure stabilization demand scenarios.

[0060] When the pressure stabilization parameters need to be adjusted, the pipe network water source is closed and depressurized, the hole elastic retainer 6 at the end of the water outlet chamber of the valve body 10 is removed, the pressure reduction hole plate 9, the spring 7 and the spring seat 8 are taken out in turn, after replacing the pressure reduction hole plate 9 with different hole diameters or the spring 7 with different stiffness coefficients, the assembly is reassembled and fixed with the hole elastic retainer 6, and the outlet pressure setting range can be changed.

[0061] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the disclosed technical content into equivalent embodiments with equivalent changes, and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution content of the present application, still falls within the protection scope of the present application.

Claims

1. A seismic-resistant indoor fire hydrant, characterized in that, Including: Valve body (10) includes an inlet chamber, an outlet chamber and an integrated fire-fighting interface; Valve disc (15) is located inside the water inlet chamber; The valve stem (16) is connected to the valve body (10) in the middle by a thread, a handwheel (1) is connected to the upper part, and the lower part is movably connected to the valve disc (15); Safety pin (4) passes through the pin hole between valve body (10) and valve stem (16); A second elastic retaining ring (17) is installed between the inner hole of the valve disc (15) and the valve stem (16) to restrict the rotation of the valve disc (15); The interaxial radial sealing structure includes a rigid sealing ring (11) installed on the valve disc (15), a pressure plate (12) fixedly connected to the lower end of the valve disc (15), a locking nut (13) locking the valve disc (15) and the pressure plate (12), and a cotter pin (14) provided on the lower surface of the valve disc (15). The pressure reducing and stabilizing assembly is located in the water outlet chamber and includes a pressure reducing orifice plate (9) installed on one side of the water outlet chamber, a spring seat (8) and an elastic retaining ring (6) for the orifice installed on the other side of the water outlet chamber, and a spring (7) installed on the spring seat (8).

2. The earthquake-resistant indoor fire hydrant according to claim 1, characterized in that: The upper part of the valve stem (16) is equipped with a shaft elastic retaining ring (2) and a flat washer (3), and the valve stem (16) is limited and fixed to the handwheel (1) by the shaft elastic retaining ring (2) and the flat washer (3).

3. The earthquake-resistant indoor fire hydrant according to claim 1, characterized in that, The connection structure between the valve disc (15) and the valve stem (16) is as follows: the inner hole of the valve disc (15) and the valve stem (16) are fitted with a clearance, and the valve disc (15) is axially limited by the second elastic retaining ring (17) through the hole, so that the valve disc (15) only moves axially when the valve stem (16) rotates.

4. The earthquake-resistant indoor fire hydrant according to claim 1, characterized in that, The pressure reducing assembly is installed as follows: the pressure reducing plate (9), spring (7), and spring seat (8) are sequentially installed into the water outlet chamber, and the end is fixed by the elastic retaining ring (6) through the hole.

5. The earthquake-resistant indoor fire hydrant according to claim 1, characterized in that: The pressure reducing orifice plate (9) is provided with a main drain outlet and a side drain outlet. When the water pressure is lower than the threshold, the spring (7) pushes the pressure reducing orifice plate (9) to separate from the spring seat (8), and the water flows through the dual channels of the main and side drain outlets to reduce pressure. When the water pressure is higher than the threshold, the spring (7) compresses to make the pressure reducing orifice plate (9) fit with the spring seat (8), the side drain outlet is closed, and the water flows through the single channel of the main drain outlet to reduce pressure.

6. The earthquake-resistant indoor fire hydrant according to claim 1, characterized in that: The valve stem (16) is provided with two shaft O-ring seals (5), which are located at the upper and lower ends of the threaded connection section, respectively, to achieve dynamic sealing of the valve stem (16).

7. The earthquake-resistant indoor fire hydrant according to claim 1, characterized in that: The valve body (10) is made of copper alloy casting, the valve stem (16) and moving parts are made of stainless steel, the shaft elastic retaining ring (2), flat washer (3), shaft O-ring seal (5), hole elastic retaining ring one (6), rigid seal ring (11) and hole elastic retaining ring two (17) are made of radiation resistant silicone rubber, and the valve stem (16) and other parts are made of stainless steel.

8. The earthquake-resistant indoor fire hydrant according to claim 1, characterized in that: The rigid sealing ring (11) is a composite structure with an inner steel ring and an outer rubber sealing layer.

9. A seismic-resistant indoor fire hydrant according to claim 1, characterized in that: The pressure relief assembly is detachable and replaceable. After removing the elastic retaining ring 1 (6) of the hole, different specifications of spring (7), spring seat (8) or pressure relief hole plate (9) can be replaced.

10. A seismic-resistant indoor fire hydrant according to claim 1, characterized in that: The fire hydrant also includes a seismic-resistant standard model that does not include a pressure-reducing assembly and a hole elastic retaining ring (6).

Images