An anti-misspray diaphragm type deluge valve

Abstract

The present invention relates to an anti-misspray diaphragm type deluge valve, which comprises a hydraulic control main valve composed of a valve body, a valve shaft diaphragm, a valve flap and a valve seat. The deluge valve further comprises a threaded check valve and a matching pipeline respectively communicated with the control cavity and the inlet cavity of the hydraulic control main valve, and a threaded electric ball valve with one end communicated with the control cavity of the hydraulic control main valve and the other end emptied, and the threaded electric ball valve is connected with a central control. Compared with the prior art, the present invention has the advantages of simple structure, low cost, high reliability, anti-misspray, anti-reset, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm deluge valves, and in particular to an anti-misspray diaphragm deluge valve. Background Art

[0002] Market deluge valves are generally divided into two types: diaphragm control and piston cylinder control. Due to the frequent formation of scale on the inner surface of the cylinder body in piston cylinder control, which affects the movement of the piston, diaphragm control is becoming more and more popular in the market. However, the national standard has a mandatory requirement for the function of deluge valves that they must have an "anti-reset function". Once the deluge valve is automatically opened by the central control, it cannot be closed again by the central control, and it cannot be turned off even when the power is cut off. It can only be manually closed on site. The so-called anti-reset function, in order to achieve this function, the external piping and accessories of the deluge valve are designed very complexly. At the same time, a drain valve must be set, and there are strict requirements for the supply pressure, which must be stable (stipulated in the national standard, otherwise there will be a risk of misspray). However, it is very difficult to achieve stable pressure on site. For example, when a deluge valve is working, the dynamic pressure drops, but when the operation of the deluge valve stops and it is closed, the static pressure rises. Then, pressure fluctuations occur at the inlet end of the deluge valve in the supply state on the same pipeline, which will cause a risk of misspray, and misspray will also cause property losses.

[0003] Chinese Patent CN207520505U discloses a diaphragm deluge alarm valve, which is composed of a diaphragm main valve and some components such as an external solenoid valve. Although an anti-reset mechanism (a water inlet valve is provided) is also installed and has an anti-reset function, when the inlet pressure of the main valve drops to the opening point of the drain valve, the drain valve is opened. At this time, if the inlet pressure of the main valve rises again, the drain valve cannot be automatically closed, the control chamber cannot be pressurized, and the main valve will be opened for misspray, that is, misspray is caused by pressure fluctuations. In addition, the solenoid valve is prone to jamming and leaking water, resulting in pressure loss in the control chamber and also causing misspray; furthermore, the main valve uses a general type of diaphragm valve, and the diaphragm is under unbalanced pressure at the outlet end in the closed state of the main valve, which is extremely easy to cause the diaphragm to be damaged and malfunction. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects existing in the prior art and provide an anti-misspray diaphragm deluge valve.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An anti-misspray diaphragm deluge valve includes a hydraulic control main valve composed of a valve body, a valve shaft, a diaphragm, a valve flap and a valve seat. It is characterized in that the deluge valve further includes a threaded check valve and a matching pipeline respectively communicating with the control chamber and the inlet chamber of the hydraulic control main valve, and a threaded electric ball valve with one end communicating with the control chamber of the hydraulic control main valve and the other end emptied, and the threaded electric ball valve is connected to the central control.

[0007] The inlet of the threaded check valve is communicated with the inlet chamber, and the outlet is communicated with the control chamber. The minimum diameter of its connecting pipe is smaller than the diameter of the threaded electric ball valve.

[0008] The threaded electric ball valve is only connected to the central control through two wires, namely "open" and "zero", and the "close" wire is abandoned to prevent the central control from closing the threaded electric ball valve by power-off. The hydraulic control main valve can only be closed manually to achieve the so-called anti-reset function.

[0009] The threaded electric ball valve is a two-way ball valve equipped with an electric actuator. The electric actuator has the function of maintaining the position after power-off and also has the functions of manual and electric operation.

[0010] The deluge valve also includes a leak-proof device installed at the outlet end of the hydraulic control main valve. In the non-pressure state, the leak-proof device is in the open state. When there is a leakage in the seal of the hydraulic control main valve, water is discharged through this leak-proof device. When the hydraulic control main valve is opened and pressure is generated at the outlet end, the leak-proof device automatically closes.

[0011] The deluge valve also includes a hydraulic alarm bell connected to the outlet end of the hydraulic control main valve.

[0012] The deluge valve also includes a pressure switch installed at the outlet end of the hydraulic control main valve. The pressure switch is connected to the central control to send a signal that the hydraulic control main valve has been opened to the central control.

[0013] The deluge valve also includes a pressure gauge communicated with the inlet chamber to display the standby pressure of the deluge valve.

[0014] The deluge valve also includes a threaded three-way ball valve. The first port of the threaded three-way ball valve is communicated with the hydraulic alarm bell, the second port is communicated with the inlet chamber, and the third port is communicated with the leak-proof device.

[0015] The control process of the deluge valve includes

[0016] a. Standby state

[0017] When the threaded electric ball valve is in the closed state, the inlet chamber and the control chamber are always communicated through the threaded check valve and have equal pressure. Moreover, the area of the diaphragm pressing plate of the hydraulic control main valve is larger than the area of the valve flap. Therefore, the hydraulic control main valve is in the closed state and will not be opened under instant pressure fluctuations, achieving the purpose of preventing mis-spray.

[0018] b. Spraying water to fight fire state

[0019] When a fire alarm signal is received, the central control automatically opens the screw-threaded electric ball valve. Since the cross-sectional area of the water inlet pipe of the control chamber is much smaller than the nominal diameter area of the screw-threaded electric ball valve, that is, the drainage area, the control chamber automatically relieves pressure. At this time, the hydraulic control main valve automatically opens to spray water, and the anti-leakage device automatically closes. The pressure switch senses the pressure at the water outlet end of the hydraulic control main valve and sends a signal to the central control, indicating that the hydraulic control main valve has been opened for fire extinguishing;

[0020] c. Anti-reset function

[0021] After this deluge valve enters the state of spraying water for fire fighting, since the wire connecting the screw-threaded electric ball valve to the central control only has two wires, namely the open wire and the zero wire, the central control cannot close the screw-threaded electric ball valve by means of electric control. Moreover, the screw-threaded electric ball valve has a position-holding function and remains in the original open state under the power-off condition. Only when the fire fighting is over, the screw-threaded electric ball valve can be manually closed on site, so that the hydraulic control main valve automatically enters the standby state, realizing the anti-reset function;

[0022] d. Control chamber pressure-holding function

[0023] To prevent the control chamber from having a short-time mis-spray phenomenon due to the lack of water when the water supply is cut off during maintenance and then the water supply is restored, a screw-threaded check valve is set at the water inlet end of the control chamber to ensure that the water in the control chamber will not be lost when the water supply is cut off, thus eliminating the short-time mis-spray phenomenon when the water supply is restored.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] This anti-mis-spray diaphragm type deluge valve overcomes many disadvantages of the existing deluge valves in the market, such as complex piping, high cost, easy mis-spray, high usage requirements, low reliability, etc. By setting a connection between the control chamber and the inlet chamber and a screw-threaded check valve, the function of preventing mis-spray under instantaneous pressure fluctuations is realized. By setting the cross-sectional area of the water inlet pipe of control chamber A to be much smaller than the nominal diameter area of the screw-threaded electric ball valve, the opening speed of the main valve is effectively guaranteed. By setting a screw-threaded electric ball valve with a position-holding function and only two wires, namely the "open" wire and the "zero" wire, connected to the electric control and abandoning the "close" wire, the main valve can be opened by electric or manual means when it is opened, but the main valve must be closed only by manual valve closing, thereby realizing the anti-reset function, and having the advantages of simple structure, low cost and high reliability. Description of the Drawings

[0026] Figure 1 It is a piping schematic diagram of the deluge valve.

[0027] Figure 2 It is a structural diagram of the main valve.

[0028] Marking description in the figure:

[0029] 1. Hydraulic control main valve, 2. Threaded check valve, 3. Threaded electric ball valve, 4. Hydraulic alarm bell, 5. Pressure switch, 6. Pressure gauge, 7. Anti-leakage device, 1-1. Valve body, 1-2. Valve cover, 1-3. Valve shaft, 1-4. Diaphragm, 1-5. Diaphragm pressing plate, 1-6. Valve flap, 1-7. Valve seat, 1-8. Spring, A. Control chamber, B. Inlet chamber, C. Outlet chamber. Detailed implementation mode

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Embodiment

[0032] As Figure 1 shown, the present invention provides an anti-misspray diaphragm type deluge valve to overcome many disadvantages of existing deluge valves in the market, such as complex piping, high cost, easy misspray, high usage requirements, low reliability, etc. The anti-misspray diaphragm type deluge valve includes a hydraulic control main valve 1 and externally connected threaded check valve 2, threaded electric ball valve 3, hydraulic alarm bell 4, pressure switch 5, pressure gauge 6, anti-leakage device 7, threaded three-way ball valve, two-way ball valve, filter and some pipe fittings.

[0033] The hydraulic control main valve 1 is composed of a valve body 1-1, a valve cover 1-2, a valve shaft 1-3, a diaphragm 1-4, a diaphragm pressing plate 1-5, a valve flap 1-6, and a valve seat 1-7. The upper part of the diaphragm 1-4 is called the control chamber A; between the valve seat 1-7 and the inlet end of the valve body 1-1 is the inlet chamber B; between the valve seat 1-7 and the outlet end of the valve body 1-1 is the outlet chamber C, as Figure 2 shown.

[0034] The threaded check valve 2 is of axial flow soft seal type, connected between the inlet end of the hydraulic control main valve 1 and the control chamber A. Its inlet is communicated with the inlet chamber B, and its outlet is communicated with the control chamber A. The minimum diameter of the connecting pipe is less than half of the diameter of the threaded electric ball valve 3.

[0035] One end of the threaded electric ball valve 3 is connected to the control chamber A, and the other end is for emptying treatment. Specifically, it is a two-way ball valve equipped with an electric actuator. The electric actuator has a power-off position-holding function and also has both manual and electric operation functions.

[0036] The hydraulic alarm bell 4 is connected to the outlet end of the hydraulic control main valve 1 and automatically drains water when sensing pressure. Once water flows through the alarm bell, the hydraulic alarm bell emits a ringing alarm.

[0037] The pressure switch 5 sends an electrical signal through pressure induction. The pressure switch 5 is installed at the outlet end of the hydraulic control main valve 1. When the hydraulic control main valve 1 is opened, the pressure switch 5 sends a signal to the central control to inform that the hydraulic control main valve 1 has been opened.

[0038] The pressure gauge 6 is connected to the inlet chamber B to display the standby pressure of the deluge valve.

[0039] The anti-seepage device 7 is installed at the outlet end of the main hydraulic control valve 1. In the non-pressure state, this device is in the open state. Once there is a leakage in the main valve seal, water will be discharged through this device. Once the main hydraulic control valve 1 is opened and pressure is generated at the outlet, this device will automatically close.

[0040] The specific control process of this anti-misspray diaphragm deluge valve includes:

[0041] 1. Standby state

[0042] When the threaded electric ball valve 3 is in the closed state, since the inlet chamber B and the control chamber A of the main hydraulic control valve 1 are always connected through the threaded check valve 2 and the pipeline and have equal pressure, and since the area of the diaphragm pressing plate 1-5 of the main hydraulic control valve 1 is larger than the area of the valve flap 1-6 in design, the main hydraulic control valve 1 is in the closed state and will never be opened under the influence of instant pressure fluctuations, achieving the purpose of preventing misspray.

[0043] 2. Spraying for fire extinguishing state

[0044] Once there is a fire alarm signal, the central control automatically opens the threaded electric ball valve 3, and the control chamber A of the main hydraulic control valve 1 automatically relieves pressure (although water is introduced into the control chamber A from the inlet end of the main hydraulic control valve 1 through the threaded check valve 2, but since the area of the water inlet pipe of the control chamber A is much smaller than the diameter area (drainage area) of the threaded electric ball valve 3, the control chamber A cannot generate pressure, ensuring the opening speed of the main hydraulic control valve 1). The main hydraulic control valve 1 automatically opens for spraying, the anti-seepage device 7 automatically closes, and the pressure switch 5 senses the pressure and sends a signal to the central control, indicating that the main hydraulic control valve 1 has been opened for fire extinguishing.

[0045] 3. Anti-reset function

[0046] The standard of the deluge valve stipulates that once the deluge valve enters the spraying fire extinguishing state, the central control cannot close the deluge valve, nor can it close the deluge valve by power-off method, that is, it is required to prevent accidental reset and closing of the deluge valve during the fire extinguishing process. Since in the present invention, the wires connecting the threaded electric ball valve 3 to the central control only connect two wires of "open" and "zero", the central control cannot close this threaded electric ball valve 3. Moreover, since the threaded electric ball valve 3 has a position-holding function, if the power is cut off, it will maintain the original open state. Only when the fire extinguishing is over and people go to the scene to manually close the threaded electric ball valve 3, the main hydraulic control valve 1 will automatically enter the standby state, realizing the anti-reset function.

[0047] 4. Control chamber pressure-holding function

[0048] To prevent the main valve control chamber A from producing a short-time misspray phenomenon due to the absence of water when the water supply is resumed after maintenance shutdown, a threaded check valve 2 is provided at the water inlet end of the main valve control chamber A to ensure that the water in the control chamber A will not be lost during the water shutdown, thus eliminating the short-time misspray phenomenon when the water supply is resumed.

[0049] In summary, the anti-misspray diaphragm type deluge valve realizes the function of preventing misspray under instant pressure fluctuations by setting up the connection between the control chamber and the inlet chamber and the threaded check valve. By setting the cross-sectional area of the water inlet pipe of the control chamber A to be much smaller than the diameter area of the threaded electric ball valve, the opening speed of the main valve is effectively guaranteed. And by setting a threaded electric ball valve with a position-holding function and only two wires of "open" and "zero" connected to the electric control, while abandoning the "close" wire, the main valve can be opened electrically or manually when it is opened, but the main valve must be closed manually only, thus realizing the anti-reset function. The present invention simultaneously upgrades the three functions of preventing misspray, opening speed and anti-reset on the basis of meeting the national standards of the deluge valve, and has the advantages of simple structure, low cost and high reliability.

Claims

1. A misspray-preventing diaphragm type deluge valve, comprising a hydraulic control main valve (1) composed of a valve body (1-1), a valve shaft (1-3), a diaphragm (1-4), a valve flap (1-6) and a valve seat (1-7), characterized in that, The deluge valve further comprises a threaded check valve (2) and matching pipelines respectively connected to the control chamber (A) and the inlet chamber (B) of the hydraulic control main valve (1), and a threaded electric ball valve (3) having one end connected to the control chamber (A) of the hydraulic control main valve (1) and the other end being emptied, wherein the threaded electric ball valve (3) is connected to the central control; The inlet of the threaded check valve (2) is connected to the inlet cavity (B), and the outlet is connected to the control cavity (A), and the minimum diameter of the connecting pipe is smaller than the diameter of the threaded electric ball valve (3); The thread-type electric ball valve (3) is connected to the central control via only two wires, an open wire and a zero wire, and the close wire is abandoned, so as to prevent the central control from closing the thread-type electric ball valve (3) by power failure, thereby realizing an anti-reset function; The control process of the deluge valve includes a. Waiting state When the threaded electric ball valve (3) is in a closed state, the inlet chamber (B) and the control chamber (A) are always connected through the threaded check valve (2), the pressures are equal, and the area of ​​the diaphragm pressure plate (1-5) of the hydraulic control main valve (1) is larger than the area of ​​the valve disc (1-6), so the hydraulic control main valve (1) is in a closed state and will not be opened even under immediate pressure fluctuations, thereby achieving the purpose of preventing accidental spraying; b. Water spraying firefighting status When a fire alarm signal is received, the central control automatically opens the threaded electric ball valve (3). Since the water inlet pipe area of ​​the control chamber (A) is much smaller than the diameter area of ​​the threaded electric ball valve (3), i.e., the drainage area, the control chamber (A) automatically releases pressure. At this time, the hydraulic control main valve (1) automatically opens to spray water, the anti-leakage device (7) automatically closes, and the pressure switch (5) senses the pressure at the water outlet of the hydraulic control main valve (1) and sends a signal to the central control, indicating that the hydraulic control main valve (1) has been opened to extinguish the fire. c. Anti-reset function When the deluge valve enters the water spraying firefighting state, since the wires of the threaded electric ball valve (3) connected to the central control are only connected to the open and zero wires, the central control cannot close the threaded electric ball valve (3) by means of electric control, and the threaded electric ball valve (3) has a position retention function, and maintains the original open state in the power-off state. Only when the fire is extinguished and the threaded electric ball valve (3) is manually closed on site, the hydraulic control main valve (1) automatically enters the servo state, realizing the anti-reset function; d. Control chamber pressure maintenance function In order to prevent the control chamber (A) from causing a short-term erroneous spraying due to the absence of water when the water is turned on again after the water is turned off for maintenance, a threaded check valve (2) is arranged at the water inlet end of the control chamber (A) to ensure that the water in the control chamber (A) will not be lost when the water is turned off, thereby eliminating the short-term erroneous spraying when the water is turned on.

2. The deluge valve of diaphragm type for preventing mis-spraying according to claim 1, characterized in that, The threaded electric ball valve (3) is a two-way ball valve equipped with an electric actuator. The electric actuator has a power-off retention function and also has manual and electric operation functions.

3. The deluge valve of diaphragm type for preventing mis-spraying according to claim 1, characterized in that, The deluge valve further comprises an anti-seepage device (7) installed at the outlet end of the hydraulic control main valve (1). In a pressure-free state, the anti-seepage device (7) is in an open state. When the seal of the hydraulic control main valve (1) leaks, water is discharged through the anti-seepage device (7). When the hydraulic control main valve (1) is opened, pressure is generated at the outlet end, and the anti-seepage device (7) is automatically closed.

4. The deluge valve of diaphragm type for preventing mis-spraying according to claim 3, characterized in that, The deluge valve further includes a hydraulic alarm bell (4) connected to the outlet end of the hydraulic control main valve (1).

5. A diaphragm deluge valve for preventing mis-spraying according to claim 1, characterized in that, The deluge valve further includes a pressure switch (5) installed at the outlet end of the hydraulic control main valve (1), and the pressure switch (5) is connected to the central control to send a signal indicating that the hydraulic control main valve (1) has been opened to the central control.

6. The deluge valve of diaphragm type for preventing mis-spraying according to claim 4, characterized in that, The deluge valve further includes a pressure gauge (6) communicating with the inlet chamber (B) for displaying the standby pressure of the deluge valve.

7. The deluge valve of diaphragm type for preventing mis-spraying according to claim 6, characterized in that, The deluge valve further includes a threaded three-way ball valve. The first port of the threaded three-way ball valve communicates with the hydraulic alarm bell (4), the second port communicates with the inlet chamber (B), and the third port communicates with the anti-seepage device (7).

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