Safety relief valve for fire fighting
The fire safety relief valve design addresses rapid closure issues by using a pressure guiding pipe and control mechanism to regulate flow, reducing water hammer effects and pipe damage.
Patent Information
- Application Number
- CN202422452562.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-10-10
AI Technical Summary
The existing safety pressure relief valves for fire fighting are fast during the seating process, which are prone to water hammer effects, resulting in damage to the pipe wall.
The design of pressure guide pipe and control parts is adopted to control the opening and closing of the outlet pipe, combined with the use of elastic parts and limiting blocks, adjust the reset speed of the diaphragm and reduce the water hammer effect.
The slow seating process reduces the damage to the pipe wall by the water flow, and improves the safety and stability of the equipment.
Smart Images
Figure CN223105368U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of pressure relief valves for fire protection, and particularly to a safety pressure relief valve for fire protection. Background Art
[0002] A safety pressure relief valve for fire protection, also known as a safety valve for fire protection, is a key safety protection device that is widely used in water pipelines, hydraulic systems, and pressure vessels. When the pressure inside the equipment or pipeline exceeds the preset safety threshold, the safety pressure relief valve for fire protection can reduce the internal pressure and prevent the equipment or pipeline from being damaged due to overpressure.
[0003] Currently, the safety pressure relief valve for fire protection includes a housing and a diaphragm fixed inside the housing. A chamber is formed between the housing and the diaphragm. A spring is provided on the inner wall of the chamber. An inlet pipe and an outlet pipe are fixed to the housing. The inlet pipe connects the water inlet of the housing to the chamber, and the outlet pipe connects the water outlet of the housing to the chamber. The working principle of the safety pressure relief valve for fire protection inside the chamber is that when the water pressure at the water inlet of the housing rises, the water inside the chamber flows out of the housing through the outlet pipe, the diaphragm approaches the housing and compresses the spring, the passage is opened, and the high-pressure water flows out of the housing. When the pressure of the high-pressure water flow decreases through the safety pressure relief valve for fire protection, the diaphragm resets under the action of the elastic member, and the water flows back into the chamber through the inlet pipe.
[0004] The above-mentioned spring reset method causes the safety pressure relief valve for fire protection to have a fast closing speed, which is prone to generating a water hammer effect and causing damage to the pipe wall, and there is room for improvement. Utility Model Content
[0005] In order to reduce the closing speed of the safety pressure relief valve for fire protection, thereby reducing the water hammer effect and reducing the damage to the pipe wall, this application provides a safety pressure relief valve for fire protection.
[0006] A safety pressure relief valve for fire protection provided by this application adopts the following technical solutions:
[0007] A safety pressure relief valve for fire protection includes a housing and a diaphragm fixed inside the housing. The diaphragm blocks the water flow passage inside the housing. A chamber is formed between the housing and the diaphragm. An inlet pipe and an outlet pipe are fixed to the housing. The inlet pipe connects the chamber to the water inlet of the housing, and the outlet pipe connects the chamber to the water outlet of the housing. A pressure guiding pipe is provided on the housing. The pressure guiding pipe connects the water inlet of the housing. A control member for detecting the water pressure at the water inlet of the housing is provided at the end of the pressure guiding pipe. The control member controls the flow of water in the outlet pipe.
[0008] By adopting the above technical solution, when the pipeline water pressure is in the initial state, under the blocking effect of the diaphragm, water flow cannot leak out through the water flow passage in the shell. When the pipeline water pressure is relatively high, the water pressure in the pressure guiding pipe rises. When the control component detects that the water pressure in the pressure guiding pipe reaches the valve opening value, the control component controls the outlet pipe to open, and the water flow in the chamber flows through the outlet pipe to the water outlet of the shell. At this time, the water output of the outlet pipe of the chamber is greater than the water input of the inlet pipe, the diaphragm approaches the control component, and the safety relief valve for fire protection starts to relieve pressure. When the water pressure of the pipeline water flow is stable, the water pressure in the pressure guiding pipe decreases, the control component controls the outlet pipe to close, and the diaphragm slowly moves away from the control component, making the closing speed of the safety relief valve for fire protection slower, thereby reducing the water hammer effect and reducing the damage to the pipe wall caused by the water flow.
[0009] Optionally, the control component includes a pilot valve and a pilot pipe fixed to the side wall of the pilot valve. One end of the pilot pipe is fixed to the side wall of the pilot valve, and the other end is fixed to the outer wall of the shell. The pilot pipe communicates the chamber and the pilot valve. One end of the outlet pipe is fixed to the side wall of the pilot valve, and the other end is fixed to the outer wall of the water outlet of the shell.
[0010] By adopting the above technical solution, when the pipeline water pressure is too high, the water in the chamber flows into the pilot pipe. Under the action of the pilot valve, the water flow in the pilot pipe flows into the outlet pipe, and the water flow is discharged through the water outlet of the shell under the action of the chamber water pressure. The water volume in the chamber decreases, and the diaphragm moves away from the inner wall of the shell. When the pipeline water pressure returns to normal, under the action of the pilot valve, the water flow in the outlet pipe stops, the water volume in the chamber increases, and the side wall of the diaphragm abuts against the inner wall of the shell.
[0011] Optionally, a valve rod is slidably connected to the outer wall of the shell. The valve rod penetrates the outer wall of the shell. One end of the valve rod is located in the chamber. An elastic member for resetting the valve rod is arranged at the end of the valve rod located in the chamber. One end of the elastic member is fixed to the inner wall of the shell, and the other end is fixed to the end of the valve rod.
[0012] By adopting the above technical solution, when the pipeline water pressure is too high, the diaphragm approaches the control component, the diaphragm abuts against and lifts the valve rod, and the elastic member is compressed. When the pipeline water pressure returns to normal, under the action of the elastic member, the displacement process of the diaphragm has a relatively high initial force, making the reset process of the diaphragm more stable.
[0013] Optionally, a limiting block is fixed to the outer wall of the valve rod. A plurality of travel indicators are slidably connected to the side walls of the valve rod and the limiting block. The travel indicator includes an indicating block fixed to the outer wall of the shell and a sliding rod fixed to the side wall of the indicating block. The sliding rod slides on the outer walls of the valve rod and the limiting block.
[0014] By adopting the above technical solution, when the pipeline water pressure is in the initial state, the rod body of the valve stem extending beyond the housing is relatively short, and the limiting block is close to the housing. At this time, under the action of the limiting block, the sliding rod close to the housing slides on the limiting block, and a large included angle is formed with the indicating block. The sliding rod far from the housing slides on the valve stem, and a small included angle is formed with the indicating block. At this time, the indicating block combination provides safety information. When the pipeline water pressure is too high, the diaphragm jacks up the valve stem, and the valve stem drives the limiting block to slide away from the housing. At this time, under the action of the limiting block, the sliding rod close to the housing slides on the valve stem, and a small included angle is formed with the indicating block. The sliding rod far from the housing slides on the limiting block, and a large included angle is formed with the indicating block. At this time, the indicating block combination provides a light signal of abnormal pipeline water pressure, enabling the staff to timely detect the pipeline water pressure condition and adjust the pipeline water pressure.
[0015] Optionally, a stop block is fixed on the inner wall of the diaphragm, and the stop block can abut against the end of the valve stem.
[0016] By adopting the above technical solution, the stop block of the diaphragm further reduces the distance between the diaphragm and the valve stem, reduces the acting distance of the valve stem on the reset of the diaphragm, and slows down the reset process of the diaphragm.
[0017] Optionally, a first needle valve is installed on the water inlet pipe, and a second needle valve is installed on the water outlet pipe.
[0018] By adopting the above technical solution, the first needle valve restricts the flow rate of the water flow in the water inlet pipe, and the second needle valve restricts the flow rate of the water flow in the water outlet pipe, making the reset process of the diaphragm smoother.
[0019] Optionally, the diameter of the water outlet pipe is smaller than that of the water inlet pipe.
[0020] By adopting the above technical solution, the flow rate of the water outlet pipe is smaller than that of the water inlet pipe, making the process of the diaphragm moving away from the control member smoother and reducing the impact of the water flow on the equipment.
[0021] Optionally, two diaphragms are provided, and both diaphragms form the chamber with the housing, and a double-chamber connecting pipe is communicated between the two chambers.
[0022] By adopting the above technical solution, under the action of the double-chamber connecting pipe, the water pressures in the two chambers are the same. When the diaphragm approaches the control member, the double diaphragms jointly move away from the inner wall of the housing, making the pressure relief process of the fire safety pressure relief valve more labor-saving.
[0023] In summary, the present application includes at least one of the following beneficial technical effects:
[0024] 1. When the water pressure in the pipeline is too high, the pressure guiding pipe is directly connected to the water inlet of the housing. The control component detects the water pressure at the water inlet of the housing and controls the outlet pipe to open. The water flow in the chamber flows into the water outlet of the housing through the outlet pipe, the water volume in the chamber decreases, and the diaphragm moves away from the inner wall of the housing. When the water pressure in the pipeline returns to normal, the control component controls the outlet pipe to close. Under the action of the inlet pipe, the chamber is filled with water, and the diaphragm slowly resets, resulting in a slower return speed of the safety pressure relief valve for fire protection, thereby reducing the water hammer effect and further reducing the damage to the pipe wall caused by the water flow.
[0025] 2. When the water pressure in the pipeline returns to normal, the elastic component pushes the valve stem to slide into the chamber, and the valve stem drives the diaphragm to reset, providing an initial force for the reset of the diaphragm and facilitating the reset process of the diaphragm.
[0026] 3. The water pressures in the two chambers are the same. When the water pressure at the water inlet exceeds the water pressure detection threshold of the control component, both diaphragms move away from the inner wall of the housing. The two chambers work together, enabling the opening and closing processes of the safety pressure relief valve for fire protection to be more labor-saving. Description of the Drawings
[0027] Figure 1 is a cross-sectional view of a safety pressure relief valve for fire protection in an embodiment of the present application.
[0028] Figure 2 is a schematic diagram of the overall structure of the safety pressure relief valve for fire protection.
[0029] Figure 3 is a side view of the safety pressure relief valve for fire protection, used to show the structure of the second needle valve.
[0030] Reference Signs: 1, housing; 2, diaphragm; 3, chamber; 4, inlet pipe; 5, outlet pipe; 6, pressure guiding pipe; 7, control component; 71, pilot valve; 72, pilot pipe; 8, valve stem; 9, elastic component; 10, limit block; 11, stroke indicator; 111, indicating block; 112, sliding rod; 12, stop block; 13, first needle valve; 14, second needle valve; 15, double-chamber connecting pipe; 16, pressure gauge. Detailed Embodiment
[0031] The following is a further detailed description of the present application in conjunction with the attached Figures 1-3 to further illustrate the present application in detail.
[0032] The embodiment of the present application discloses a safety pressure relief valve for fire protection.
[0033] Refer to Figure 1, a safety pressure relief valve for fire fighting, comprising a housing 1 and a diaphragm 2 bolted inside the housing 1. In the embodiment of the present application, preferably two diaphragms 2 are provided. Chambers 3 are formed between the two diaphragms 2 and the housing 1. A valve stem 8 is slidably connected to the housing 1. One end of the valve stem 8 is located inside the chamber 3. An elastic member 9 is provided on the valve stem 8. The elastic member 9 is preferably a spring. One end of the elastic member 9 is fixed to the housing 1, and the other end is fixed to the end of the valve stem 8 located inside the chamber 3.
[0034] A stop block 12 is fixed to the inner wall of the diaphragm 2. When the safety pressure relief valve for fire fighting works, the high-pressure water flow at the water inlet jacks up the diaphragm 2. The stop block 12 abuts against the end of the valve stem 8. The diaphragm 2 compresses the elastic member 9, causing the valve stem 8 to slide in a direction away from the chamber 3. When the water flow pressure at the water inlet returns to normal, the elastic member 9 drives the valve stem 8 to reset. The valve stem 8 pushes the diaphragm 2 to reset, providing an initial thrust for the reset of the diaphragm 2, making the reset process of the diaphragm 2 more labor-saving.
[0035] Reference Figure 1 and Figure 2 , a water inlet pipe 4 and a pressure guiding pipe 6 are fixed to the water inlet of the housing 1, and a water outlet pipe 5 is fixed to the water outlet of the housing 1. The water inlet pipe 4 connects the water inlet of the housing 1 and the chamber 3. A control member 7 is provided at the end of the water outlet pipe 5. When the water pressure at the water inlet is high, the control member 7 controls the opening of the water outlet pipe 5, and the water in the chamber 3 is discharged through the water outlet pipe 5, and the water inlet and the water outlet are connected. When the water pressure at the water inlet returns to normal, the control member 7 controls the closing of the water outlet pipe 5, the water inlet pipe 4 intakes water, the water volume in the chamber 3 returns to normal, and the water flow path between the water inlet and the water outlet is blocked.
[0036] The control member 7 includes a pilot valve 71 fixed to the end of the water outlet pipe 5 and a pilot pipe 72 fixed to the pilot valve 71. One end of the pilot pipe 72 away from the pilot valve 71 is fixed to the outer wall of the housing 1. The pilot pipe 72 connects the chamber 3 and the pilot valve 71. The water outlet pipe 5 connects the pilot valve 71 and the water outlet of the housing 1. The pressure guiding pipe 6 connects the water inlet of the housing 1 and the pilot valve 71. A pressure gauge 16 is fixed to the side wall of the pressure guiding pipe 6. When the water pressure at the water inlet of the housing 1 is high, the pilot valve 71 detects the pressure magnitude of the water flow through the pressure guiding pipe 6 and controls the opening and closing of the water outlet pipe 5 through the detection signal. At the same time, the pressure gauge 16 reflects the actual water pressure value, facilitating inspection by the staff.
[0037] A number of stroke indicators 11 are provided on the housing 1. Preferably, there are two stroke indicators 11. The stroke indicator 11 includes an indicating block 111 fixed on the housing 1 and a sliding rod 112 rotatably connected to the end of the indicating block 111. A limiting block 10 is fixed on the valve stem 8. The two sliding rods 112 slide on both ends of the limiting block 10 respectively. When the valve stem 8 slides upward, at this time, the water pressure at the water inlet of the housing 1 is relatively high. The end of the sliding rod 112 close to the housing 1 contacts the side wall of the valve stem 8, and the end of the sliding rod 112 far from the housing 1 contacts the side wall of the limiting block 10. At this time, the two indicating blocks 111 provide a lighting signal for abnormal water pressure. When the valve stem 8 resets, at this time, the water pressure at the water inlet of the housing 1 is normal. The end of the sliding rod 112 close to the housing 1 contacts the side wall of the limiting block 10, and the end of the sliding rod 112 far from the housing 1 contacts the side wall of the valve stem 8. At this time, the two indicating blocks 111 provide a lighting signal for normal water pressure.
[0038] A double-chamber connecting pipe 15 is fixed on the side wall of the pilot pipe 72. One end of the double-chamber connecting pipe 15 is fixed to the side wall of the pilot pipe 72, and the other end is fixed to the side wall of the housing 1. The double-chamber connecting pipe 15 communicates the two chambers 3. The water flow between the two chambers 3 is exchanged through the double-chamber connecting pipe 15. The setting of the double-chamber connecting pipe 15 makes the water pressure in the two chambers 3 the same, making the displacement of the diaphragm 2 more labor-saving and improving the pressure relief speed when the fire-fighting safety pressure relief valve works.
[0039] Reference Figure 2 and Figure 3 A first needle valve 13 is installed on the side wall of the water inlet pipe 4, and a second needle valve 14 is installed on the side wall of the water outlet pipe 5. Through the first needle valve 13 and the second needle valve 14, the staff can further control the water flow rate in the water inlet pipe 4 and the water outlet pipe 5. A double-chamber connecting pipe 15 is also fixed on the water inlet pipe 4. The diameter of the water inlet pipe 4 is larger than that of the water outlet pipe 5, and the water flow rate of the water inlet pipe 4 is larger than that of the water outlet pipe 5, making the process of the diaphragm 2 moving away from the control member 7 more labor-saving and facilitating the operation of the fire-fighting safety pressure relief valve.
[0040] The implementation principle of a fire-fighting safety pressure relief valve in an embodiment of the present application is as follows: When the water pressure at the water inlet of the housing 1 is relatively high, the pilot valve 71 detects the water pressure change, and then the pilot valve 71 controls the water outlet pipe 5 to open. The water flow in the chamber 3 flows into the water outlet of the housing 1 through the water outlet pipe 5, and the diaphragm 2 moves in a direction away from the inner wall of the housing 1. When the water pressure at the water inlet of the housing 1 returns to normal, the pilot valve 71 detects the normal water pressure through the pressure guiding pipe 6, and the pilot valve 71 controls the pipe wall of the water outlet pipe 5. The water flow in the water inlet pipe 4 slowly flows into the chamber 3, and the diaphragm 2 slowly moves away from the control member 7. The closing speed of the fire-fighting safety pressure relief valve is relatively slow, thereby reducing the water hammer effect and reducing the damage caused by the water flow to the pipe wall.
[0041] The above are all preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.
Claims
1. A safety relief valve for fire protection, characterized in that: It includes a housing (1) and a diaphragm (2) fixed inside the housing (1). The diaphragm (2) blocks the water flow path inside the housing (1). A chamber (3) is formed between the housing (1) and the diaphragm (2). An inlet pipe (4) and an outlet pipe (5) are fixed on the housing (1). The inlet pipe (4) communicates the chamber (3) with the water inlet of the housing (1), and the outlet pipe (5) communicates the chamber (3) with the water outlet of the housing (1). A pressure guiding pipe (6) is arranged on the housing (1), and the pressure guiding pipe (6) communicates with the water inlet of the housing (1). A control member (7) for detecting the water pressure at the water inlet of the housing (1) is arranged at the end of the pressure guiding pipe (6), and the control member (7) controls the flow of water in the outlet pipe (5).
2. The safety relief valve for fire fighting according to claim 1, wherein: The control member (7) includes a pilot valve (71) and a pilot pipe (72) fixed to the side wall of the pilot valve (71). One end of the pilot pipe (72) is fixed to the side wall of the pilot valve (71), and the other end is fixed to the outer wall of the housing (1). The pilot pipe (72) communicates the chamber (3) with the pilot valve (71). One end of the outlet pipe (5) is fixed to the side wall of the pilot valve (71), and the other end is fixed to the outer wall of the water outlet of the housing (1).
3. A safety pressure relief valve for fire protection according to claim 1, characterized in that: A valve rod (8) is slidably connected to the outer wall of the housing (1). The valve rod (8) penetrates the outer wall of the housing (1). One end of the valve rod (8) is located inside the chamber (3). An elastic member (9) for resetting the valve rod (8) is arranged at the end of the valve rod (8) inside the chamber (3). One end of the elastic member (9) is fixed to the inner wall of the housing (1), and the other end is fixed to the end of the valve rod (8).
4. A safety relief valve for fire fighting according to claim 3, characterized in that: A limit block (10) is fixed to the outer wall of the valve rod (8). A plurality of travel indicators (11) are slidably connected to the side walls of the valve rod (8) and the limit block (10). The travel indicator (11) includes an indicator block (111) fixed to the outer wall of the housing (1) and a sliding rod (112) fixed to the side wall of the indicator block (111). The sliding rod (112) slides on the outer walls of the valve rod (8) and the limit block (10).
5. A safety pressure relief valve for fire fighting according to claim 4, characterized in that: A stop block (12) is fixed to the inner wall of the diaphragm (2), and the stop block (12) can abut against the end of the valve rod (8).
6. A safety relief valve for fire protection according to claim 1, characterized in that: A first needle valve (13) is installed on the inlet pipe (4), and a second needle valve (14) is installed on the outlet pipe (5).
7. A safety pressure relief valve for fire fighting according to claim 1, characterized in that: The diameter of the outlet pipe (5) is smaller than that of the inlet pipe (4).
8. A safety relief valve for fire protection according to claim 1, characterized in that: There are two diaphragms (2), and both of the two diaphragms (2) form the chamber (3) with the housing (1). A double-chamber connecting pipe (15) communicates between the two chambers (3).