JP4068489B2 - Sprinkler fire extinguishing equipment and check valve - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a sprinkler fire extinguishing equipment and a check valve.
[0002]
[Prior art]
Conventional fire extinguishing equipment installed in buildings, mainly closed wet sprinkler fire extinguishing equipment, dry sprinkler fire extinguishing equipment mainly used in cold regions without introducing fire extinguishing water in the pipe, or compressed to the secondary side Pre-actuated sprinkler fire extinguishing equipment that introduces fire extinguishing water by the signal of a fire detector installed separately by introducing air is used.
[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 such a system, it has been widely used in recent years (see, for example, Patent Document 1).
[0004]
Further, as a check valve with a small flow rate using a spherical valve body, for example, there is one used for a simultaneous opening valve that maintains the closed state of the valve body using the pressure of supplied fire extinguishing water. For example, see Patent Document 2).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-331042
[Patent Document 2]
Japanese Patent Laid-Open No. 2002-257251
[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, the fire extinguishing water following from the primary side pipe also has a problem that the water is discharged until the water supply is stopped.
[0008]
In addition, it is possible to use a spherical valve element in such a low-flow bypass pipe to close the valve in both directions, and to reverse only when a flow rate sufficient to lift the spherical valve element is generated on one side. Although it is possible to use a stop valve, it is difficult to adjust the movement of the spherical valve body depending only on the water flow, and it is conceivable that necessary water supply to the secondary side pipe is closed.
[0009]
Therefore, an object of the present invention is to reliably supply fire extinguishing water for replenishment from a bypass pipe to a predetermined pipe.
[0010]
[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 A valve that is provided in the upper side and has a downward secondary side opening that faces the primary side opening that is opened upward, and enables either of the primary side opening and the secondary side opening to be sealed in the flowing water direction. comprises a check valve and a body, in the vicinity of the secondary-side opening of the check valve, the elastic body having an opening for forming a gap is disposed between the valve body when the valve body abuts, The valve body is moved forward by increasing the amount of water flowing to the secondary side opening. It is characterized in that to close the secondary opening.
[0011]
The opening of the elastic body has a predetermined distance with respect to the secondary side opening of the check valve, and allows deformation of the elastic body.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 9 and 10 are system configuration diagrams schematically showing the sprinkler fire extinguishing equipment according to the first embodiment using the present invention.
[0015]
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, a control valve V1 disposed on the primary side of the pre-actuating valve MV, a paddle type running water detection switch FD disposed on the secondary side of the pre-acting valve MV, and the pre-acting valve MV are provided. Bypass pipe SR with check valve SV to bypass, pressure switch PS for detecting secondary pressure drop, remote start valve PV for enabling pre-actuating valve MV to be opened by depressurization opening method, manually openable And a manual start valve HV.
[0016]
The operation of the sprinkler fire extinguishing equipment by the pre-acting valve MV having such a valve rotation will be briefly described. Normally, as shown in FIG. 9, the primary-side piping P1 and the secondary-side piping P2 in the pre-acting valve MV 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.
[0017]
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. 10, and the valve body 12 of the pre-acting valve MV is opened.
[0018]
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.
[0019]
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.
[0020]
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.
[0021]
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. The ceiling portion of the moving space 34 is formed in the funnel portion 40 so as to restrict the secondary side opening 37.
[0022]
In addition, a coupling portion 38 provided with a screw thread is formed at the lower portion of the upper member 31, and a convex step portion 39 is formed on the outer side thereof so as to contact the O-ring 35 by forming a circumferential wall surface.
[0023]
The lower member 32 is formed with a primary side opening 43 facing the moving space 34 through a small hole 47 connected to the bypass pipe SR inside a pipe connection portion 41 by a threaded portion to which the bypass pipe SR is connected. In addition, the floor 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.
[0024]
The primary side opening 43 and the secondary side opening 37 are provided in a small circular shape, and when the spherical valve body 33 moves in the moving space 34, a spherical shape is formed on the outer periphery of the primary side opening 43 and the secondary side opening 37 by the movement. It forms so that the valve body 33 may contact | abut and may be in a sealing state.
[0025]
In addition, a coupling portion 45 provided with a thread is formed on the upper portion of the lower member 32, and a concave step portion 46 with which a circumferential wall surface is formed to contact the O-ring 35 is formed.
[0026]
Then, the lower member 32 can be fitted into the upper member 31 via the O-ring 35, and the coupling portion 38 and the coupling portion 45 can be screwed together to be coupled and fixed. At this time, the O-ring 35 is sandwiched between the outward circumferential wall of the convex step portion 39 of the upper member 31 and the circumferential wall of the concave step portion 46 of the lower member 32 regardless of whether or not the above-mentioned fixed state is present, and exhibits a sealing function. .
[0027]
The movement space 34 is formed by the coupling of the upper member 31 and the lower member 32, and the spherical valve body 33 is inserted therein and the elastic body 60 is inserted therein.
[0028]
The elastic body 60 includes a cylindrical portion 61 formed so as to contact the inner wall surface of the cylindrical moving space 34 and an upper wall portion 62 formed in a substantially lid shape on the upper member 31 side. An elastic opening 63 is formed in the central portion of the wall portion 62. The elastic body 60 is positioned by being sandwiched above and below the inner wall surface of the moving space 34, and the elastic opening 63 is disposed immediately before the secondary side opening 37.
[0029]
FIG. 4 shows a cross-sectional shape of the elastic opening 63 taken along the line AA ′ shown in FIG.
[0030]
In the upper wall portion 62 of the elastic body 60, a circular portion 71, which is in contact with the spherical valve body 33, of the periphery of the elastic opening 63 and a circular portion 71 which is not in contact with the spherical valve body 33 and is opposed to the circular portion 71. It is set as the shape which has the two ear | edge parts 72 and 73 which are. When the spherical valve body 33 comes into contact with the circular portion 71, a gap is formed in the ear portions 72 and 73, and a small flow rate can be passed in this state. When the flow rate is large, the spherical valve body 33. Is pressed against the upper wall portion 62 of the elastic body 60 and deformed, whereby the spherical valve body 33 abuts on the secondary side opening 37 and closes the secondary side opening 37. In addition, this deformation is such that a space exists above the upper wall 62 of the elastic body 60 due to the presence of the funnel 40 in the secondary opening 37, and the upper wall 62 moves within the space. It can be deformed.
[0031]
As described above, the closing of the secondary side opening 37 by the spherical valve body 33 is determined by the elasticity of the upper wall portion 62, and the check valve SV can be stably operated. In this embodiment, the spherical valve body 33 abuts on the secondary side opening 37 to close the flowing water to the secondary side, but the spherical valve body 33 seals the elastic opening 63 of the elastic body 60. Thus, the secondary side opening 37 may be closed. The deformation of the upper wall portion 62 of the elastic body 60 can be moved into the funnel portion 40. However, when the upper wall portion 62 cannot be moved without configuring the funnel portion 40, the upper wall portion 62 compression deformation can also be used. However, at this time, the thickness of the upper wall portion 62 is required.
[0032]
With respect to the shape of the elastic opening 63, the fact that it can take various shapes will be described with reference to the cross-sectional shapes of FIGS.
[0033]
First, in the elastic body 60A in FIG. 5, the parallel parts 74 and 75 where the spherical valve body 33 abuts a part of the circumference of the elastic opening 63A and the spherical valve body 33 are not formed but arcuately formed. The shape has circumferential portions 76 and 77. When the spherical valve body 33 comes into contact with the parallel portions 74 and 75, a gap is formed between the circumferential portions 76 and 77. Water can be passed through this gap, and the spherical valve body 33 deforms the elastic body 60A in the same manner as in FIG.
[0034]
Next, in the elastic body 60B in FIG. 6, the periphery of the elastic opening 63B is formed in an elliptical shape. When the spherical valve body 33 comes into contact with the elastic opening 63B, the shortest two points 78 and 79 are brought into contact with each other, and a gap is formed in other portions. Water can be passed through this gap, and the spherical valve body 33 deforms the elastic body 60B as in the case of FIG.
[0035]
Next, in the elastic body 60C in FIG. 7, of the circumference of the elastic opening 63C, the protruding portions 80 and 81 with which the spherical valve body 33 comes into contact with the distal end portion and the spherical valve body 33 are not in contact with each other, and are elastic in a substantially circular shape. The outer peripheral portions 82 and 83 that form the opening 63 </ b> C are formed. When the spherical valve body 33 comes into contact with the tip portions of the projecting portions 80 and 81, a gap is formed between the outer peripheral portions 82 and 83. Water can be passed through the gap, and the spherical valve body 33 deforms the elastic body 60C as in the case of FIG.
[0036]
Next, in the elastic body 60D in FIG. 8, the periphery of the elastic opening 63D is formed in a square shape. When the spherical valve body 33 abuts on the elastic opening 63D, it abuts on the central part of each of the square side parts 84, 85, 86, 87, and a gap is formed at each apex part. Water can be passed through this gap, and the spherical valve body 33 deforms the elastic body 60D as in the case of FIG.
[0037]
The shape employed for the elastic opening 63 is not limited as long as it has a gap when the spherical valve element 33 abuts, and the shape of the gap and the setting of the force to be deformed can be easily adjusted. For example, when the protrusions 80 and 81 as shown in FIG. 7 are used, the protrusions 80 and 81 are likely to be deformed. If the elliptical opening 63B as shown in FIG. The pressing force is distributed and can function stably over a long period of time.
[0038]
In the check valve SV formed in this way, when the primary side pipe P1 and the secondary side pipe P2 in FIG. 9 are always at the same pressure, the spherical valve body 33 moves downward under its own weight as shown in FIG. The primary opening 43 is sealed by being guided by the funnel portion 44 of the lower member 32. 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.
[0039]
When the pressure on the secondary side pipe P2 is reduced 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 as shown in FIG. 34, the primary side opening 43 is opened, and the high-pressure primary side pipe P1 side of the fire extinguishing water 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, falls in the moving space 34, and 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.
[0040]
In addition, when the sprinkler head S in the secondary side pipe P2 malfunctions due to some impact, the secondary side pipe P2 is greatly depressurized, and in the check valve SV, first, the moving space 34 is first moved upward. The ball valve 33 moves quickly and comes into contact with the elastic opening 63 of the elastic body 60, and the spherical valve body 33 opens the primary side opening 43 as shown in FIG. 2. In this case, the spherical valve body 33 has a large pressure difference from the inside of the primary side pipe P <b> 1 through the primary side opening 43, and the spherical valve body 33 is strongly pushed up toward the secondary side opening 37, whereby the elastic body 60. The upper wall portion 62 is deformed to settle in a position where the secondary side opening 37 is sealed as shown in FIG. 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.
[0041]
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.
[0042]
This check valve SV can functionally cope with a slight amount of extinguishing water replenishment accompanying the pressure fluctuation in the secondary side pipe P2, and can close a large amount of extinguishing water outflow such as a malfunction of the sprinkler head S. . 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 to be replenished through the bypass pipe SR is limited. Since water flows through the gap between the body 60 and the elastic opening 63, the flow rate is further limited.
[0043]
The check valve SV has a simple structure in which two members of the upper member 31 and the lower member 32 are screwed together, and the O-ring 35 is sandwiched between the circumferential walls of the convex step portion 39 and the concave step portion 46 only by these connections. , Have a sufficient sealing function. Furthermore, when the upper member 31 and the lower member 32 are combined, the spherical valve body 33 and the elastic body 60 are inserted, and the moving space 34 is easily formed.
[0044]
When the check valve SV used in this embodiment is taken out as a single unit, in addition to the sprinkler fire extinguishing equipment, a detection head for a simultaneous open valve used for an open sprinkler fire extinguishing equipment or a foam fire extinguishing equipment is installed. It can also be used in a water filling mechanism for piping, and can also be used in piping for replenishing fire-fighting water by bypassing the water flow detector in a normal wet sprinkler fire extinguishing facility.
[0045]
Next, a second embodiment of the present invention will be described. In the second embodiment, the system is the same sprinkler fire extinguishing equipment as the first embodiment, and the check valve SV ′ having a different structure is added to the check valve SV in FIGS. 9 and 10 showing the system. This check valve SV ′ will be described with reference to FIGS. 11 to 13. FIGS. 11 to 13 correspond to the relationship of FIGS. 1 to 3 regarding the check valve SV in the first embodiment, and the role and operation of the check valve SV ′ are the same as those of the check valve SV. Therefore, the same reference numerals are assigned to the same members and the description thereof is omitted.
[0046]
The check valve SV ′ is configured by combining a main body member 31 ′ with a sealing member 32 ′, and the spherical valve body 33 is held in the movement space 34.
[0047]
The main body member 31 ′ has an outer shape in which the upper member 31 and the lower member 32 in the first embodiment are combined, and a cylindrical opening connected to the moving space 34 at a portion corresponding to the secondary side opening 43. A portion is formed, and the main body shape similar to that of the check valve SV is formed by connecting the sealing member 32 ′ to the opening portion by screwing.
[0048]
Due to the structure of the check valve SV ′ according to the second embodiment, the sealing member 32 ′ is located inside the pipe connection portion 36 of the main body member 31 ′. It is not necessary to interpose a water-stopping member such as a packing between them, and the number of points can be reduced and the assembling work can be simplified. Further, since both the primary side and the secondary side of the pipe are coupled to the main body member 31 ′, the coupling state at the check valve SV ′ is further robust.
[0049]
【The invention's effect】
As described above, the present invention provides a secondary pipe provided with a sprinkler head, a primary pipe connected to a water supply source, and a preliminary pipe disposed between the primary pipe and the secondary pipe. In a sprinkler fire extinguishing system comprising a working valve, a bypass pipe that maintains the same pressure by connecting the primary side pipe and the secondary side pipe with a small flow rate while avoiding the pre-actuated valve that is kept closed at all times And a downward secondary opening that is provided in the bypass pipe and that faces the primary opening that opens upward, and is sealed between the primary opening and the secondary opening in the direction of water flow. comprising a check valve provided with a valve body which allows stop, elasticity of the vicinity of the secondary-side opening of the check valve, the openings forming a gap between the valve body when the valve body is in contact The body is placed and the flow of water to the secondary opening increases. By the valve body closes the secondary-side opening, if the sprinkler head by some impact not fire is opened, it is possible to close the extinguishing water to follow from the primary side piping, fire fighting within the secondary side piping Only water can be released.
[0050]
The opening of the elastic body has a predetermined distance with respect to the secondary side opening of the check valve, and allows deformation of the elastic body.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a check valve according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a different state of FIG.
3 is a cross-sectional view showing a different state of FIG.
4 is a horizontal sectional view showing the elastic body of FIG. 1; FIG.
FIG. 5 is a cross-sectional view showing an elastic body having a shape different from that of FIG. 4;
6 is a cross-sectional view showing an elastic body having a shape different from that of FIG. 4;
7 is a cross-sectional view showing an elastic body having a shape different from that of FIG. 4;
FIG. 8 is a cross-sectional view showing an elastic body having a shape different from that of FIG.
FIG. 9 is a schematic system configuration diagram using the check valve of FIG. 1;
10 is a system configuration diagram showing the operating state of FIG. 9. FIG.
FIG. 11 is a longitudinal sectional view showing a check valve according to a second embodiment of the present invention.
12 is a cross-sectional view showing a different state of FIG.
13 is a cross-sectional view showing a different state of FIG.
[Explanation of symbols]
SR Bypass piping SV Check valve 33 Spherical valve body 37 Secondary side opening 43 Primary side opening 60 Elastic body 63 Elastic 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 with a downward secondary opening facing the primary opening that opens upward, and can be sealed between the primary opening and the secondary opening in the direction of running water A check valve having a valve body,
An elastic body having an opening that forms a gap with the valve body when the valve body abuts is disposed in the vicinity of the secondary side opening of the check valve, and the amount of water flowing to the secondary side opening is increased. The sprinkler fire extinguishing equipment, wherein the valve body closes the secondary side opening.   The sprinkler fire extinguishing system according to claim 1, wherein the opening of the elastic body has a predetermined distance with respect to the secondary side opening of the check valve, and allows deformation of the elastic body.

Images