JP3934978B2 - Sprinkler fire extinguishing equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a sprinkler fire extinguishing facility.
[0002]
[Prior art]
Conventionally, as fire extinguishing equipment installed in buildings, we mainly use wet-type closed sprinkler fire extinguishing equipment, and do not introduce fire extinguishing water into the piping, mainly used in cold regions, or compressed air on the secondary side. Pre-actuated sprinkler fire extinguishing equipment that introduces fire extinguishing water by the signal of a fire detector installed separately is introduced.
[0003]
Sprinkler fire extinguishing equipment with so-called water pre-operation that always fills the secondary pipe with fire-extinguishing water while using a pre-actuating valve that is controlled to open based on the signal from the fire detector, etc. is also useful without delaying water discharge. As a simple system, it has been widely used in recent years.
[0004]
[Problems to be solved by the invention]
In the above-mentioned sprinkler fire extinguishing system with pre-charged water, charging and pressurization is performed to monitor the condition of the secondary piping so that malfunctions can be detected due to pressure drop when the sprinkler head is opened instead of a fire, for example. It has become. In addition to the opening and closing of the pre-actuating valve, the secondary piping where the sprinkler head is installed is often formed with a low-flow bypass piping from the primary piping. Not only the fire extinguishing water in the secondary side pipe but also a small flow rate, there was a problem that the fire extinguishing water following from the primary side pipe was discharged until it was stopped.
[0005]
Therefore, an object of this invention is to close the fire-extinguishing water supplied to a secondary side piping from bypass piping.
[0006]
[Means for Solving the Problems]
The present invention includes a secondary side pipe provided with a sprinkler head, a primary side pipe connected to a water supply source, and a pre-acting valve disposed between the primary side pipe and the secondary side pipe. In the sprinkler fire extinguishing equipment provided, a bypass pipe that avoids the pre-acting valve that is normally kept closed, connects the primary side pipe and the secondary side pipe with a small flow rate and maintains the same pressure, and the bypass pipe Provided in the bottom portion of the moving space and facing the primary side opening, and a downward secondary side opening is provided in the ceiling portion of the moving space , and the primary side opening and the secondary side opening A check valve having a valve body held so as to be movable in between, and the valve body normally moves downward under its own weight to seal the primary side opening, and the secondary side piping. Fire extinguished on the secondary piping side by being lifted by the pressure drop To fill a, with the increased flow through the primary opening, it is characterized in that in which moves upward to seal the secondary opening.
[0007]
In addition, the check valve is a combination of two members: an upper member in which the secondary side opening is formed in the funnel portion in the ceiling portion, and a lower member in which the primary side opening is formed in the funnel portion in the floor surface portion. A moving space is formed by combining the upper member and the lower member, and a spherical valve element is inserted into the moving space .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are system configuration diagrams schematically showing a sprinkler fire extinguishing facility which is an embodiment using the present invention.
[0009]
In the figure, a unit 20 is a so-called valve rotation of a pre-acting valve MV provided in a water supply pipe by a secondary side pipe P2 to which a plurality of closed sprinkler heads S are connected and a primary side pipe P1 from a water supply source (not shown). Specifically, the control valve V1 disposed on the primary side of the pre-actuating valve MV, the paddle type running water detection switch FD disposed on the secondary side of the pre-actuating valve MV, and the reverse bypassing them. Bypass pipe SR provided with stop valve SV, secondary pressure drop detection pressure switch PS, remote start valve PV for enabling pre-actuating valve MV to be opened by a pressure reducing opening method, and manually enabling opening manually And a start valve HV.
[0010]
Briefly explaining the operation of the sprinkler fire extinguishing equipment by the pre-actuating valve MV having such a valve periphery, the primary side pipe P1 and the secondary side pipe P2 always have a pre-actuating valve MV as shown in FIG. Since the remote start valve PV is normally closed via the bypass pipe SR, the pressure in the piston chamber 11 of the pre-actuating valve MV is also the same.
[0011]
When a fire occurs, a fire detector (not shown) is activated, and based on that, the remote start valve PV is opened by a control panel (not shown). By opening the remote start valve PV, the piston chamber 11 of the pre-actuating valve MV is decompressed by drainage as shown in FIG. 2, and the valve body 12 of the pre-acting valve MV is opened.
[0012]
Then, the sprinkler head S is opened by the heat of the fire, fire extinguishing water is supplied from the primary side pipe P1 via the pre-actuating valve MV, and water is discharged from the sprinkler head S. This water discharge causes water to flow in the secondary side pipe P2, and the water flow detection switch FD is activated to generate a water flow detection signal.
[0013]
In addition, when only a fire detector (not shown) is activated at the time of non-fire, the pre-actuating valve MV is controlled to be opened as described above. However, since the sprinkler head S is closed, water discharge is not performed. In addition, when only the sprinkler head S is activated during a non-fire, residual water is temporarily discharged from the secondary side pipe P2 of the pre-actuating valve MV, and a drop in the secondary pressure based on this is detected by the pressure switch PS. Since the pre-acting valve MV is closed, a small amount of fire extinguishing water tries to follow through the bypass pipe SR, but the check valve SV described later seals the bypass pipe SR. When closed, the scale of water loss is extremely small.
[0014]
Next, the check valve SV will be described with reference to FIGS. The check valve SV is configured by combining the upper member 31 and the lower member 32 via an O-ring 35 and holding the spherical valve body 33 movably in the moving space 34.
[0015]
In the upper member 31, a secondary side opening 37 that leads to a small hole 49 is formed in a ceiling portion of a substantially cylindrical space serving as a moving space 34 inside a pipe connection portion 36 by a screw portion to which the bypass pipe SR is connected. 3 is connected to the bypass pipe SR not shown in FIG. 3, and the ceiling portion of the moving space 34 is formed in the funnel portion 40 so as to restrict the secondary side opening 37.
[0016]
In addition, a flange portion 38 is formed at the lower portion of the upper member 31, and a concave step portion 39 is formed on the inner side thereof to form a circumferential wall surface with which the O-ring 35 abuts.
[0017]
The lower member 32 is formed with a substantially cylindrical water channel 42 connected to the bypass pipe SR (not shown in FIG. 3) inside the pipe connection part 41 by a threaded part to which the bypass pipe SR is connected, so that the small holes 47 are formed. A primary side opening 43 facing the moving space 34 is formed, and a floor surface portion of the moving space 34 is formed in the funnel portion 44 so as to be narrowed down to the primary side opening 43.
[0018]
The primary side opening 43 is smaller than the secondary side opening 37, and a differential pressure with the inside of the moving space 34 is easily generated on the primary side opening 43 side.
[0019]
Further, a flange portion 45 is formed on the upper portion of the lower member 32, and a convex step portion 46 is formed on the inner side thereof so as to form a circumferential wall surface with which the O-ring 35 abuts.
[0020]
The lower member 32 is fitted into the upper member 31 via the O-ring 35 and the flange portion 38 and the flange portion 45 can be coupled and fixed by bolting or sandwiching with a clamping metal fitting not shown in detail. it can. At this time, the O-ring 35 is sandwiched between the circumferential wall of the concave step portion 39 of the upper member 31 and the circumferential wall of the convex step portion 46 of the lower member 32 regardless of whether or not the above-described fixed state is present, thereby exhibiting a sealing function.
[0021]
The check valve SV formed in this way is such that when the primary side pipe P1 and the secondary side pipe P2 in FIG. Guided by the funnel portion 44, the primary side opening 43 is sealed. In this state, even if the primary side pipe P1 side becomes low pressure, fire extinguishing water does not flow out from the primary side opening 43 to the primary side pipe P1 side, so the primary side pipe P1 side due to water discharge from other sections not shown in detail. Even if a pressure drop occurs, the pressure in the secondary pipe P2 does not drop, so the pressure switch PS does not work and does not issue an alarm.
[0022]
When the pressure on the secondary side pipe P2 decreases due to natural pressure fluctuation, the force that is pushed up by the differential pressure from the primary side opening 43 acts on the spherical valve body 33, and the spherical valve body 33 is lifted in the moving space 34, and the primary The side opening 43 is opened, and the fire extinguishing water on the high-pressure primary side pipe P1 side is filled into the secondary side pipe P2 via the bypass pipe SR. When this filling approaches the same pressure, the force that pushes up the spherical valve element 33 is weakened and falls in the moving space 34, so that the spherical valve element 33 is again in the position where the primary opening 43 is sealed by the funnel 44 as shown in FIG. Calm down.
[0023]
When the sprinkler head S in the secondary side pipe P2 malfunctions due to some impact, the secondary side pipe P2 is greatly decompressed and the spherical valve element 33 is pushed up in the check valve SV in the same manner as described above. The primary side opening 43 is opened. Then, the spherical valve body 33 in this case is pushed up as the flow rate through the primary side opening 43 increases, and quickly moves upward in the moving space 34 and is guided to the funnel portion 40. As shown in FIG. It settles in a position where the secondary opening 37 is sealed. In this state, the flowing water of the bypass pipe SR is closed, the pressure on the secondary pipe P2 side does not increase, and the force pushing up to the spherical valve body 33 does not weaken, so the secondary opening 37 is sealed. Is maintained.
[0024]
Thus, the check valve SV has a function of sealing the outflow of the fire-extinguishing water from the secondary side pipe P2 to the primary side pipe P1 in the bypass pipe SR, and also from the primary side pipe P1 to the secondary side pipe P2. It has a function to close the supply of excess fire-extinguishing water. Therefore, even when the sprinkler head S malfunctions, the amount of water discharged is very small.
[0025]
This check valve SV is functionally compatible with a slight amount of extinguishing water replenishment accompanying pressure fluctuation in the secondary side pipe P2, and a large amount of extinguishing water outflow such as a malfunction of the sprinkler head S is closed. The relationship between the flow rate and the closing of the secondary side opening 37 is determined by the gap between the moving space 34 and the spherical valve element 33.
[0026]
Moreover, since the primary side opening 43 and the secondary side opening 37 are connected by the small holes 47 and 49, the flow rate of the fire-extinguishing water by the bypass pipe SR is limited.
[0027]
The check valve SV has a simple structure in which two members of the upper member 31 and the lower member 32 are combined, and the O-ring 35 is sandwiched between the circumferential walls of the concave step portion 39 and the convex step portion 46 only by fitting them together. , Have a sufficient sealing function. Furthermore, when the upper member 31 and the lower member 32 are combined, the spherical valve body 33 is inserted, and the moving space 34 is simply formed.
[0028]
In the above embodiment, the upper member 31 and the lower member 32 are coupled using the flange portions 38 and 45. However, the threads such as the pipe connection portions 36 and 41 are formed in the male and female respectively. And may be configured to be coupled, and the size of the outer periphery can be reduced.
[0029]
The present invention includes a secondary side pipe provided with a sprinkler head, a primary side pipe connected to a water supply source, and a pre-acting valve disposed between the primary side pipe and the secondary side pipe. In the sprinkler fire extinguishing equipment provided, a bypass pipe that avoids the pre-acting valve that is normally kept closed, connects the primary side pipe and the secondary side pipe with a small flow rate and maintains the same pressure, and the bypass pipe Provided in the bottom portion of the moving space and facing the primary side opening, and a downward secondary side opening is provided in the ceiling portion of the moving space , and the primary side opening and the secondary side opening A check valve having a valve body held so as to be movable in between, and the valve body normally moves downward under its own weight to seal the primary side opening, and the secondary side piping. Fire extinguished on the secondary piping side by being lifted by the pressure drop To fill a, with the increased flow through the primary-side opening, which moves upward to seal the secondary-side opening, in the case of malfunction of the sprinkler head, the extinguishing water in the primary side piping It is possible to stop following the secondary side piping.
[0030]
Further, in the check valve, the check valve is composed of two members: an upper member in which the secondary side opening is formed in the funnel portion in the ceiling portion, and a lower member in which the primary side opening is formed in the funnel portion in the floor surface portion. A moving space is formed by combining the upper member and the lower member, and a spherical valve body is inserted into the moving space, and has a simple structure and a spherical valve body. The movement space is simply formed by inserting a funnel portion for stopping the spherical valve body at a predetermined position, so that the primary side opening or the secondary side opening is opened when the spherical valve body moves. It is surely guided to seal.
[Brief description of the drawings]
FIG. 1 is a schematic system configuration diagram showing an embodiment of the present invention.
FIG. 2 is a system configuration diagram showing an operation state of FIG. 1;
3 is a cross-sectional view showing the structure of the check valve in FIG. 1. FIG.
4 is a cross-sectional view showing a flowing water closed state of FIG. 3;
[Explanation of symbols]
MV Pre-acting valve SR Bypass piping SV Check valve 33 Spherical valve element 37 Secondary side opening 43 Primary side opening

Claims (2)

A sprinkler comprising: a secondary side pipe provided with a sprinkler head; a primary side pipe connected to a water supply source; and a pre-acting valve disposed between the primary side pipe and the secondary side pipe. In fire extinguishing equipment,
A bypass pipe that avoids the pre-acting valve that keeps a normally closed state, connects the primary side pipe and the secondary side pipe with a small flow rate, and maintains the same pressure;
Provided in the bypass pipe, a downward secondary side opening is provided in a ceiling portion of the moving space so as to face a primary side opening opened upward in a bottom surface portion of the moving space , and the primary side opening and the secondary side A check valve having a valve body that is movably held between the side openings;
With
The valve body normally moves downward under its own weight, seals the primary side opening, is lifted by a pressure drop of the secondary side pipe and fills the secondary side pipe with extinguishing water, and A sprinkler fire extinguishing system that moves upward to seal the secondary side opening as the flow rate through the primary side opening increases . The check valve is a combination of two members: an upper member in which the secondary side opening is formed in the funnel portion in the ceiling portion, and a lower member in which the primary side opening is formed in the funnel portion in the floor surface portion, The sprinkler fire extinguishing equipment according to claim 1 , wherein a moving space is formed by combining the upper member and the lower member, and a spherical valve element is inserted into the moving space .

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