JP2019205786A - Flow control valve for negative pressure and wet type pre-operation sprinkler system - Google Patents

Abstract

To eliminate an inconvenience due to dust jamming in a water flow channel in which a small amount of water is circulated.SOLUTION: A flow control valve is composed of: a body part 2 consisting of a cylinder part 2A and a cover part 2B; a piston part 9 provided so as to move forward by the pressure of water in the body part 2; and a coil spring 13 for energizing the piston part 9 in a backward movement direction. The piston part 9 is of a cylindrical shape, one end of which is closed (closed part 9'), and the other end of which is formed with a flange part 10 whose outer diameter is the same as the inner diameter of the cylinder part 2A. The cylindrically shaped part is provided with an opening 12 whose diameter is smaller than that of an opening 4 of a closed part 2A' in the cylinder part 2A. When the piston part is moved to the most advanced position against the energizing force of the coil spring 13 by the pressure of entering water, the closed part 9' is brought into close contact with the inner surface of the closed part 2A' of the cylinder part 2A. Furthermore, a groove 11A that forms a flow channel of a small circulation amount is provided on the surface of the closed part 9' of the piston part 9 opposite to the closed part 2A' of the cylinder part 2A.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flow control valve in a negative-pressure wet pre-actuated sprinkler facility in which secondary side piping is filled with water and is in a negative pressure state except when a fire occurs.

  As a conventional fire extinguishing equipment, when the sprinkler head breaks, etc., it has the function of preventing water leakage and quickly discharging water in the event of a fire. There is a negative pressure wet pre-actuated sprinkler system that makes negative pressure.

  FIG. 14 is a schematic configuration diagram of such negative pressure wet pre-actuated sprinkler equipment. In the figure, reference numeral 100 denotes a negative pressure wet pre-actuated sprinkler facility.

  Reference numeral 101 denotes a primary side pipe that is piped up from the fire extinguishing water tank 102 via a water pump 103. Reference numeral 104 denotes a secondary side pipe connected to the primary side pipe 101 and piped to the sprinkler head 105.

Reference numeral 106 denotes a pre-operated running water detection device that is installed between the primary side pipe 101 and the secondary side pipe 104 and is kept closed except when a fire occurs. Reference numeral 107 denotes a fire detector installed on the ceiling for detecting a fire and sending out a fire signal.

108 is connected to the secondary side pipe 104 at one end side 108A, the other end side 108B is connected to the intake pipe 110 rising from the vacuum pump 109, and a drain pipe 111 having a lower end depending on the fire fighting water tank 102. A suction tube connected to

A flow control valve 112 is installed in the middle of the suction pipe 108 so as to make a small amount of flow when the negative pressure in the secondary side pipe 104 is normal and a large amount of flow when abnormal. Further, the flow control valve 112 is an automatic valve with an orifice shown in FIGS. 15 and 16, and there is a direct-acting electromagnetic valve having a diameter of 40A. As another example, the rating is DC 24 volts, 1,580 mA.

The automatic valve with an orifice, which is the flow control valve 112, is shown in FIG.
When the negative pressure in the secondary pipe 104 is normal (slow pressure rise), the air containing water flowing into the main body from the inlet side opening 112a is indicated by an arrow. A small amount flows through the opening 112b on the outlet side by passing through the orifice (small hole) 112A. Further, when the negative pressure in the secondary side pipe 104 is abnormal (a sudden rise in pressure), as shown in FIG. 16, the valve body 112e is raised by the energization via the electromagnetic coil 112c and the plunger 112d to be opened. A large amount flows through the original flow path 112B to the opening 112b on the outlet side.

In FIG. 14, reference numeral 113 denotes a vacuum switch for detecting the pressure in the secondary side pipe 104 installed at a position on the secondary side pipe 104 side of the flow rate control valve 112 in the middle of the suction pipe 108.

  Reference numeral 114 denotes a signal receiving board that receives a fire signal from the fire detector 107 when a fire occurs and transmits the signal to a control board described later.

  115 receives a signal from the signal receiving board 114, opens the pre-actuated water flow detection device 106 to bring the primary side pipe 101 and the secondary side pipe 104 into communication, and the water pump 103 It is a control panel to be operated. In the other figures, 116 is a steam separator installed at the connection portion of the intake pipe 110 to the suction pipe 108, and 117 is installed at the connection portion of the intake pipe 110 and the drain pipe 111 of the suction pipe 108. Check valve.

  When the fire does not occur, both the primary side pipe 101 and the secondary side pipe 104 are filled with water, and the inside of the secondary side pipe 104 is vacuum pumped via the suction pipe 108 and the intake pipe 110. 109 is a negative pressure state.

  Further, when a fire occurs, the fire detector 107 detects a fire and transmits a fire signal to the signal receiving board 114, and transmits the signal from the signal receiving board 114 to the control board 115. Receiving the signal, the control panel 115 opens the pre-actuated water flow detection device 106 and operates the water pump 103. As a result, water is continuously discharged from the sprinkler head 105. In this case, the automatic valve with an orifice which is the flow control valve 112 is in a normal state shown in FIG. 15, and the operation of the vacuum pump 109 is stopped.

The conventional negative pressure wet pre-actuated sprinkler equipment is as described above. However, such equipment has a problem in the configuration that appropriately maintains the state of the negative pressure in the secondary side pipe. This is because an automatic valve with an orifice is used as the flow control valve 112 installed in the middle of the suction pipe 108.

  Thus, such an automatic valve with an orifice is a solenoid valve, and such a solenoid valve has a merit that the control method is simple, such as closing when not energized and opening when energized, while consuming current. It is large and must be energized while the valve element is open, requiring a large power source. As described above, the automatic valve with an orifice used in the conventional equipment is a direct acting solenoid valve having a caliber of 40A, and as an example, the rating is DC 24 volts, 1,580 mA. The current consumption is large and a large power source is required to open the valve body.

In addition, the electromagnetic valve that has been conventionally used has a problem in the event of a power failure because it consumes a large current as described above and requires a large power source to open the valve body. In other words, during a power outage, the secondary pipe may suddenly increase in pressure due to damage to the secondary pipe, and the valve may need to be opened. It was necessary to take measures such as installing or supplying power with emergency power supply equipment. However, when a storage battery with a large capacity is provided, not only the size of the storage battery itself, but also the size of the control panel for storing it increases, and the cost also increases. In addition, when power is supplied from the emergency power supply facility, it is necessary to estimate the power supply capacity when designing the emergency power supply facility in advance, and there is a problem that the facility cannot be renewed.

Therefore, the present inventors, in the negative pressure wet pre-actuated sprinkler facility, use electric power instead of the conventional automatic valve with orifice as a flow control valve for appropriately maintaining the pressure in the secondary side pipe used therefor. An unnecessary flow control valve was devised earlier. And by using this, the above conventional problems can be solved ugly.

Thus, the flow control valve previously devised by the present inventor is as shown in FIGS. In the figure, reference numeral 1 denotes a flow control valve, which is provided so as to be able to move forward in the main body 2 by the pressure of water in the main body 2 through which air and water flowing into the suction pipe from the secondary side pipe pass. The main body 2 includes a cylinder part 2A and a cover part 2B attached to one end of the cylinder part 2A. The piston part 9 includes a coil spring 13 that urges the piston part 9 in the backward movement direction. The cylinder portion 2A has a cylindrical shape with one end closed, and has an outlet 3 at the center of the closed portion 2A ′ and the outlet 3 coupled to the inside of the outlet 3. An opening 4 having a smaller diameter is provided, the cover portion 2B has a cylindrical shape with one end closed, an inflow port 7 is provided in the closing portion 2B ', and the piston 9 has one end. It is in the shape of a closed cylinder 9 'and the outer diameter is A flange portion 10 equal to the inner diameter of the portion 2A is formed, and an opening 11 having a diameter smaller than that of the opening 4 of the closing portion 2A 'in the cylinder portion 2A is provided in the central portion of the closing portion 9'. A large-diameter opening 12 is provided, and the closed portion 9 'moves to the most advanced position against the urging force of the coil spring 13 by the pressure of the inflowing water, so that the closed portion 9' of the closed portion 2A 'of the cylinder portion 2A. It is designed to be in close contact with the inner surface.

A male screw 5 is engraved on the outer peripheral surface on the other end side of the cylinder portion 2A, and a cover portion 2B in which a female screw 6 is engraved on the inner peripheral surface is screwed and mounted correspondingly. Has been made.

Further, an O-ring 8 is interposed between the end face on the other end side of the cylinder part 2A and the closed part 2B 'of the cover part 2B, so that water tightness between the cylinder part 2A and the cover part 2B is maintained. I'm leaning.

Further, the coil spring 13 abuts on the flange portion 10 with the piston portion 9 inserted in the cylinder portion 2A, and presses and urges the piston portion 9 toward the inlet 7 of the cover portion 2B. Yes. The elastic force (spring constant) of the coil spring 13 is obtained when water is supplied from the primary side pipe 101 into the secondary side pipe 104 and a part of the water flows into the suction pipe 108 in the event of a fire. It is necessary to reduce the pressure only by the pressure. Accordingly, water flows in from the inlet 7 of the cover portion 2B, and the piston portion 9 is moved forward in a state where the pressure exceeds the urging force of the coil spring 13.

The operation of the flow control valve 1 is as follows.
When there is a slow pressure increase due to volume expansion due to temperature change of the secondary side pipe or a small air inflow from the flow rate control pipe at times other than when a fire occurs, the piston portion 9 moves backward as shown in FIG. The air and water flowing in from the inlet 7 of the cover portion 2B merge through the small-diameter opening 11 and the large-diameter opening 12 of the piston portion 9 and from the opening 4 and the outlet 3 of the cylinder portion 2A. leak.

Further, when the sprinkler head or the like is damaged and the pressure in the secondary side pipe rapidly rises, the piston portion 9 is in the same retracted position as in FIG. 12, and the vacuum pump 109 is activated. And this leakage prevents water leakage. At this time, since the suction force of the vacuum pump 109 is lower than the elastic force of the coil spring 13, the piston portion 9 does not move.

Further, when water is supplied from the primary side pipe 101 to the secondary side pipe 104 and a part of the water flows into the suction pipe 108 in the event of a fire, as shown in FIG. The piston portion 9 moves to the most advanced position against the urging force, and the closed portion 9 'is in close contact with the inner surface of the closed portion 2A' of the cylinder portion 2A. At this time, the vacuum pump 109 does not operate. As a result, only a small amount of water flows through the small-diameter opening 11 of the piston portion 9, and sufficient water discharge from the sprinkler head 105 is ensured. Although water continuously flows out from the small-diameter opening 11 of the piston portion 9, the influence of the outflow is small because the diameter of the opening 11 is small.

Then, when the pre-actuated running water detection device 106 is closed after the fire extinguishing is completed, the pressure in the secondary pipe 104 decreases due to water flowing out from the small-diameter opening 11 of the piston portion 9, and the piston portion 9 is moved to the coil spring 13. To return to the retracted position again.

As described above, the flow control valve 1 operates without requiring electric power.

  The flow control valve 1 previously devised by the present inventor has the effects and advantages as described above, and by using this, the problems in the conventional negative pressure wet pre-actuated sprinkler facility are greatly solved. Is something that can be done. In addition, the present inventor has further conducted earnest research in order to ensure the action and effect more continuously.

In the flow control valve 1 previously devised by the present inventor, a small-diameter opening 11 is provided in the central portion of the closed portion 9 ′ of the piston portion 9.

As shown in FIG. 13, the small-diameter opening 11 moves the piston portion 9 to the most advanced position due to the pressure of water flowing in at the time of the fire, and the closed portion 9 'is the closed portion 2A' of the cylinder portion 2A. When close to the inner surface, the amount of flowing water is limited and limited to ensure sufficient water discharge from the sprinkler head 105, and when the pre-actuated water flow detection device 106 is closed after the fire is completed. , The pressure in the secondary side pipe 104 is reduced by causing water to flow out through the small-diameter opening 11.

Moreover, although the small-diameter opening 11 is provided in such a role, dust easily accumulates therein, and if left for a long time, the dust is clogged in the opening 11 and actually fires. When this occurs, there is a problem that the original function may not be exhibited.

The reason why the small-diameter opening 11 is likely to be clogged with dust inside is that the inner diameter is originally small and the internal space is narrow, so it is easy to fill even fine dust, and is elongated in a tunnel shape. This is because the circulation of air is poor because it is surrounded all around, and the accumulated dust cannot be blown out by the weak air that circulates.

Therefore, in view of such a point, the present inventor has replaced the small-diameter opening 11 with the closed portion of the piston portion facing the closed portion of the cylinder portion or the closed portion of the cylinder portion of the closed portion of the cylinder portion. To find out that inconvenience due to dust can be eliminated by providing a groove that forms a flow path with a flow rate comparable to that of the small-diameter opening 11 on the surface facing the portion, and see the completion of the present invention. It has come.

Thus, the gist of the present invention is that
A pre-actuated water detection device and a primary pipe provided on the primary side of the pre-actuated water detection device and having a water supply means connected to the base end side;
Connected to the secondary side pipe connected to the sprinkler head, the vacuum pump using the secondary side pipe as a negative pressure, and the secondary side pipe and the vacuum pump. An intake pipe to
A main body portion provided at a connection portion between the secondary side pipe and the intake pipe, through which air and water flow into the intake pipe from the secondary side pipe;
A piston portion that can be moved forward by the pressure of water in the main body portion, a coil spring that biases the piston portion in the backward movement direction, and one end portion that guides the movement of the piston portion and the piston portion is closed. In the flow control valve in the negative pressure wet pre-actuated sprinkler facility constituted by the cylinder part provided with an opening in the closed part,
The piston part has a cylindrical shape with one end closed, and a flange part having an outer diameter equal to the inner diameter of the cylinder part is formed at the other end, and the cylindrical part has a smaller diameter than the opening of the closed part in the cylinder part. The closed portion is brought into close contact with the inner surface of the closed portion of the cylinder portion by moving to the most advanced position against the urging force of the coil spring by the pressure of the inflowing water. A flow control valve,
The closed portion of the piston portion is on the surface of the cylinder portion facing the closed portion of the cylinder portion or the closed portion of the cylinder portion facing the closed portion of the piston portion. In a state of being in close contact with the closed portion, a groove that forms a small amount of flow passage between the outer periphery of the piston portion and the opening of the closed portion in the cylinder portion is provided between the closed portions. The negative pressure wet pre-acting sprinkler equipment is in the flow control valve.

  In the above configuration, the number of grooves may be only one, but preferably two or more.

  The present invention is configured as described above, and instead of the small-diameter opening of the piston portion in the flow rate control valve previously devised by the inventor, the opposed surface of the closed portion of the piston portion to the closed portion of the cylinder portion. Alternatively, a groove that forms a flow path having a flow rate comparable to that of the small-diameter opening is provided on the surface of the closed portion of the cylinder portion that faces the closed portion of the piston portion. It can be solved.

  That is, in the case of a small-diameter opening, the inner diameter is quite small and the internal space is narrow, so even fine dust tends to fill up quickly, but in the case of a groove, about half of its cross-section is open. Because the space is wider and the length is smaller than that of the small-diameter opening, there is no immediate filling of dust, and in the case of the small-diameter opening, it is elongated in a tunnel shape and surrounded by the entire circumference. However, in the case of a groove, the air flow is good because half of the cross-section is open, so the accumulated dust is the air flowing along the groove and the air flowing in from the open part. Therefore, inconvenience due to clogging of dust can be solved.

  Moreover, although the number of grooves may be only one, it is preferable to use two or more. That is, in the case where two or more are provided, even if one of the grooves is inconvenient due to dust, this inconvenience can be covered if other grooves are in circulation.

It is a vertical side view of the flow control valve in the negative pressure wet pre-actuated sprinkler facility according to the first embodiment of the present invention, and shows a normal state. It shows the state when the fire occurred. It is a vertical side view of the piston part of the flow control valve in the negative pressure wet pre-actuated sprinkler facility according to the first embodiment of the present invention. It is the same front view. It is a vertical side view of the example which changed the groove | channel of the piston part of the flow control valve in the negative pressure wet pre-action sprinkler equipment which concerns on 1st Embodiment of this invention. It is the same front view. It is a vertical side view of the other modification which changed the groove | channel of the piston part of the flow control valve in the negative pressure wet pre-action sprinkler equipment which concerns on 1st Embodiment of this invention. It is the same front view. It is sectional drawing of the groove | channel provided in the piston part of the flow control valve in the negative pressure wet pre-action sprinkler equipment which concerns on 1st Embodiment of this invention. It is a vertical side view of the flow control valve in the negative pressure wet pre-actuated sprinkler facility according to the second embodiment of the present invention, and shows a normal state. It shows the state when the fire occurred. It is a vertical side view of the flow control valve in the negative pressure wet pre-actuated sprinkler facility previously devised by the present inventor, and shows a normal state. It is a vertical side view of the flow control valve in the negative pressure wet pre-actuated sprinkler facility previously devised by the present inventor and shows a state at the time of occurrence of a fire. It is a schematic block diagram of the conventional negative pressure wet pre-operation sprinkler equipment. It is operation | movement explanatory drawing of the automatic valve with an orifice in the conventional negative pressure wet pre-operation sprinkler installation, and shows the state at the time of the pressure rise slowly in secondary side piping. It is operation | movement explanatory drawing of the automatic valve with an orifice in the conventional negative pressure wet pre-operation sprinkler installation, and shows the state at the time of the rapid rise of the pressure in secondary side piping.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a flow control valve 1 'in a negative pressure wet pre-actuated sprinkler facility according to an embodiment of the present invention. The flow control valve 1 'differs only in the groove provided in the piston portion, and the other configuration is the same as the flow control valve 1 in the negative pressure wet pre-acting sprinkler equipment previously devised by the present inventor. Therefore, the same members are denoted by the same reference numerals, and detailed description thereof is omitted.

  Thus, the flow control valve 1 ′ in the negative pressure wet pre-actuated sprinkler facility according to the present embodiment is replaced with the small-diameter opening 11 of the piston portion 9 in the flow control valve 1 previously invented by the present inventor, The closed portion 9 'of the piston portion 9 is in close contact with the closed portion 2A' of the cylinder portion 2A on the surface facing the closed portion 2A 'of the cylinder portion 2A (the state shown in FIG. 2). ), A groove 11A that forms a small amount of flow passage between the outer periphery of the piston portion 9 and the opening 4 of the closed portion 2A 'in the cylinder portion 2A is provided between both closed portions. It is what. Note that the small amount of circulation is the same amount of circulation as the small-diameter opening 11 of the piston portion 9 in the flow control valve 1 previously devised by the present inventor. Is the total distribution volume.

  Further, the cross-sectional shape of the groove 11A and the width, depth and length thereof can be appropriately selected within the scope of the object of the present invention, and FIG. 9 shows an example of the cross-sectional shape. In FIG. 9, A shows a V-shaped cross section, B shows a semicircular shape, and C shows a U-shaped cross section.

  Further, the number of the grooves 11A may be only one, but in the present embodiment, two grooves are provided. That is, as shown in FIG. 3 and FIG. 4, a groove is provided that passes through the central portion of the closed portion 9 ′ of the piston portion 9 and that both end portions reach the outer periphery of the piston portion 9, and is closed from each of both end portions of the groove. The portion of the portion 9 ′ toward the center portion is a groove 11 </ b> A that forms a flow path.

  When two grooves 11A and 11A are used in this way, even if one of the grooves 11A is inconvenient due to dust, the inconvenience can be covered if the other groove 11A is in circulation. It will be.

  FIGS. 5 and 6 show another example in which the number of the grooves 11A is plural. In such an example, the grooves similar to the grooves shown in FIGS. It is provided so as to intersect with each other. Thus, in such a case, the portions from both ends of the crossed grooves to the central portion of the closed portion 9 'become the grooves 11A that form the flow paths. Therefore, in this case, four grooves 11A, 11A, 11A, and 11A are provided.

  FIGS. 7 and 8 show still another example in which the number of the grooves 11A is plural. In such an example, in each of the grooves shown in FIGS. The length is set so as not to reach the central portion of the closed portion 9 ′ in the piston portion 9 from both ends.

  The flow control valve 1 'according to the present embodiment has the above-described configuration, and as shown in FIG. 2, the piston portion 9 moves to the most advanced position due to the pressure of water flowing in at the time of the fire, and the closed portion 9' Is in close contact with the inner surface of the closed portion 2A 'of the cylinder portion 2A, the inflowing water is a gap between the outer periphery of the piston portion 9 and the inner periphery of the cylinder portion 2A from the opening 12 of the cylindrical portion of the piston portion 9. The amount of flow is reduced by a small amount of groove 11A provided between the closed portion 9 'of the piston portion 9 and the closed portion 2A' of the cylinder portion 2A, so that only a small amount of water passes. It is something that will not do. In addition, when the pre-actuated running water detection device is closed after the completion of fire extinguishing, the pressure in the secondary side pipe is reduced by allowing water to flow out through the groove 11A.

  In addition, the flow control valve 1 'according to the present embodiment replaces the small-diameter opening of the piston portion in the flow control valve 1 previously devised by the present inventor, as described above. In the cylinder portion 2A, a groove 11A that forms a flow path having a flow rate similar to that of the small-diameter opening is provided on the surface of the cylinder portion 2A that faces the closed portion 2A '. According to the groove 11A, the small-diameter opening In this case, inconvenience due to dust can be eliminated, so that the operation and effect as a flow control valve can be ensured more continuously.

  The reason why the inconvenience due to dust in the case of a small-diameter opening can be eliminated by using the groove 11A is as follows. That is, in the case of a small-diameter opening, the inner diameter is quite small and the internal space is narrow, so that even fine dust is easily filled, but in the case of the groove 11A, about half of its cross-section is open. Since the space is wider and is longer than the small-diameter opening, there is no immediate filling of dust, and in the case of a small-diameter opening, it is elongated in a tunnel shape and surrounded by the entire circumference. However, in the case of the groove 11A, half of the cross section is open, so that the air flow is good. Therefore, the accumulated dust is collected from the air flowing along the groove 11A and the open part. It is easy to be discharged by the inflowing air, so that inconvenience due to dust clogging can be solved.

  In the present embodiment, since the plurality of grooves 11A and 11A are provided, even if one of the grooves 11A is inconvenient due to dust, this inconvenience is covered if the other groove 11A is in circulation. Is something that can be done.

  Next, the flow control valve in the negative pressure wet pre-actuated sprinkler facility according to the second embodiment of the present invention shown in FIGS. 10 and 11 will be described.

  In the figure, 1 ″ is a flow control valve. The flow control valve 1 ″ differs from the flow control valve 1 ′ in the first embodiment only in the position of the groove. Since the operation is the same as that of the flow rate control valve 1 'in the first embodiment, the same members are denoted by the same reference numerals and detailed description thereof is omitted.

  Thus, in the flow rate control valve 1 'in the first embodiment, the groove 11A is provided on the surface of the closing portion 9' of the piston portion 9 facing the closing portion 2A 'of the cylinder portion 2A. In this embodiment, the flow control valve 1 ″ is provided with the groove 11A ′ on the surface of the closed portion 2A ′ of the cylinder portion 2A facing the closed portion 9 ′ of the piston portion 9.

  In the case of the present embodiment, as shown in FIG. 11, the piston portion 9 is moved to the most advanced position by the pressure of the water flowing in at the time of the fire occurrence, and the closed portion 9 'is the closed portion 2A of the cylinder portion 2A. When in close contact with the inner surface of ′, the inflowing water flows out from the opening 12 of the cylindrical portion of the piston portion 9 into the space between the outer periphery of the piston portion 9 and the inner periphery of the cylinder portion 2A. The flow rate is narrowed by a small flow amount groove 11A ′ provided between the closed portion 2A ′ of 2A and the closed portion 9 ′ of the piston portion 9, so that only a small amount of water passes. . Further, when the pre-actuated running water detection device is closed after the completion of fire extinguishing, the pressure in the secondary side pipe is reduced by allowing water to flow out through the groove 11A ′.

1 ′, 1 ″ Flow control valve 2 Main body portion 2A Cylinder portion 2A ′ Closed portion 2B Cover portion 2B ′ Closed portion 3 Outlet 4 Opening 7 Inlet 7A One end side of inlet 7B Other end side of inlet 9 Piston portion 9 ′ Blocking portion 10 Flange portion 11A, 11A ′ Groove 12 Opening 13 Coil spring 100 ″ Negative pressure wet pre-acting sprinkler equipment 100 ′ Negative pressure wet pre-acting sprinkler equipment previously invented by the present inventor 100 Conventional negative pressure wet pre-acting Sprinkler equipment 101 Primary side pipe 102 Fire extinguishing water tank 103 Water supply pump 104 Secondary side pipe 105 Sprinkler head 106 Pre-acting water flow detector 107 Fire detector 108 Suction pipe 109 Vacuum pump 110 Intake pipe 111 Drain pipe 113 Vacuum switch 114 Signal receiver 115 Control panel

Thus, the gist of the present invention is that
A pre-actuated water detection device and a primary pipe provided on the primary side of the pre-actuated water detection device and having a water supply means connected to the base end side;
Provided on the secondary side of該予operated water flow detection device, and the secondary side piping sprinkler head is connected, a vacuum pump to vacuum the secondary pipe, said secondary pipe and the vacuum pump A suction pipe that connects one end to the secondary pipe, an intake pipe that connects one end to the suction pipe with a drain pipe interposed therebetween, and the other end connected to the vacuum pump;
Said provided on the suction pipe, the main body portion of the air and water flowing into the Aspirate pipe from the secondary pipe passes,
A piston portion that can be moved forward by the pressure of water in the main body portion, a coil spring that biases the piston portion in the backward movement direction, and one end portion that guides the movement of the piston portion and the piston portion is closed. In the flow control valve in the negative pressure wet pre-actuated sprinkler facility constituted by the cylinder part provided with an opening in the closed part,
The piston portion has a cylindrical shape with one end closed, and a flange portion whose outer diameter is equal to the inner diameter of the cylinder portion is formed at the other end portion, and an opening having a larger flow rate than the groove described later is provided in the cylindrical portion. A flow control valve configured such that the closed portion is brought into close contact with the inner surface of the closed portion of the cylinder portion by moving to the most advanced position against the urging force of the coil spring by the pressure of the flowing water. There,
The closed portion of the piston portion is on the surface of the cylinder portion facing the closed portion of the cylinder portion or the closed portion of the cylinder portion facing the closed portion of the piston portion. In a state of being in close contact with the closed portion, a groove that forms a small amount of flow passage between the outer periphery of the piston portion and the opening of the closed portion in the cylinder portion is provided between the closed portions. The negative pressure wet pre-acting sprinkler equipment is in the flow control valve.

Claims (2)

A pre-actuated water detection device and a primary pipe provided on the primary side of the pre-actuated water detection device and having a water supply means connected to the base end side;
Connected to the secondary side pipe connected to the sprinkler head, the vacuum pump using the secondary side pipe as a negative pressure, and the secondary side pipe and the vacuum pump. An intake pipe to
A main body portion provided at a connection portion between the secondary side pipe and the intake pipe, through which air and water flow into the intake pipe from the secondary side pipe;
A piston portion that can be moved forward by the pressure of water in the main body portion, a coil spring that biases the piston portion in the backward movement direction, and one end portion that guides the movement of the piston portion and the piston portion is closed. In the flow control valve in the negative pressure wet pre-actuated sprinkler facility constituted by the cylinder part provided with an opening in the closed part,
The piston part has a cylindrical shape with one end closed, and a flange part having an outer diameter equal to the inner diameter of the cylinder part is formed at the other end, and the cylindrical part has a smaller diameter than the opening of the closed part in the cylinder part. The closed portion is brought into close contact with the inner surface of the closed portion of the cylinder portion by moving to the most advanced position against the urging force of the coil spring by the pressure of the inflowing water. A flow control valve,
The closed portion of the piston portion is on the surface of the cylinder portion facing the closed portion of the cylinder portion or the closed portion of the cylinder portion facing the closed portion of the piston portion. In a state of being in close contact with the closed portion, a groove that forms a small amount of flow passage between the outer periphery of the piston portion and the opening of the closed portion in the cylinder portion is provided between the closed portions. Flow control valve in negative pressure wet pre-acting sprinkler equipment. The flow control valve in a negative pressure wet pre-actuated sprinkler facility according to claim 1, wherein the number of the grooves is one or more.

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