JP4796898B2 - Flowing water detector - Google Patents

Description

  The present invention relates to a water flow detection device that is used in, for example, a sprinkler facility and is used to flow water by opening a flow path when a fire occurs.

In general, this type of water flow detection device has a valve body with a check valve structure that is operated by the pressure of water, and the primary and secondary sides are held in a state where both the primary and secondary sides are pressurized with full water. ing. The valve body is always closed by water pressure from the secondary side, and a pump that operates at the time of water discharge is provided on the primary side, and a sprinkler head is piped on the secondary side.
When a fire occurs, the sprinkler head is opened to start water discharge. When water discharge starts, the valve body of the water flow detection device is opened and the water flow passage is opened. The valve body is structured to be connected to the spindle. When the valve body is operated, the spindle rotates. This rotation is detected by a detection device installed outside, and the detection result is sent to the control panel as a signal. The alarm device is activated.

  The water flow detectors are usually installed at a plurality of locations in a building such as an apartment house, and water pipes connected to the water flow detectors are connected in the building. In the event of a fire, a predetermined sprinkler is activated according to the scale of the fire, and one or many of the water flow detectors provided at a plurality of locations are activated by the operation of the sprinkler. . When the number of operating sprinklers changes, the pressure applied to each water flow detector varies, but even in this case, it must be detected and operated.

As described above, the flowing water detection device detects the open state of the valve body by the internal mechanism when the valve body is opened by flowing water, but the detection device must operate at least. The operating pressure is set to 0.1 MPa, and the minimum operating flow rate is set to 50 L / min, and it is necessary to detect the movement of the valve body at a low pressure / small flow rate stage as compared with the use conditions of a general check valve. For this reason, it is necessary for the flowing water detection device to have a structure that can largely open the valve body when the flow rate during water flow is small.
In addition, the flowing water detection device has a pressure loss that is allowed when water flows. For example, in the flowing water detection device having a diameter of 40A, the allowable pressure loss when water flows at a flow rate of 350 L / min. It is within 0.05 MPa.

  By the way, the ball check valve having a general structure has a shape in which the secondary side is greatly swollen from the sealing portion because the use condition and the mounting position of the pipe are both vertical and horizontal. For this reason, even if it tried to use a general ball check valve for the vertical piping of a flowing water detection apparatus, pressure loss became 0.05MPa or more of regulation, and it could not be used. In addition, the ball check valve has a small opening angle at the minimum flow rate due to the shape of the internal flow path, and even if it tries to convert the angle of the valve element to the rotation of the spindle, it has only a very small rotation angle. It was difficult to detect running water.

  On the other hand, a general swing check type check valve also has a structure in which the rotation angle of the valve body is small when the flow rate is small, and the rotation angle increases at a substantially constant rate as the flow rate increases. . For this reason, the opening degree of the valve body at the minimum flow rate becomes small, and it is difficult to detect running water.

  In addition, as described above, even when the number of operating sprinklers changes depending on the scale of the fire, an error should not be caused in the rotation angle of each valve body, and the minimum predetermined flow rate (50 L / min) Even when the water flows, it is necessary to reliably rotate the valve body to a predetermined angle.

  In addition, rubber such as O-rings is used to improve the sealing performance of the seat surface provided on the body side. However, this O-ring may be rubbed with dirt or rust, resulting in water leaks. Therefore, it is necessary to perform replacement work regularly. For this reason, it is necessary for the flowing water detection device to have a structure that can be easily maintained.

  As this type of water flow detection device, for example, there is a water flow detection device of Patent Document 1. In this water flow detection device, an arc-shaped protrusion is projected from the check valve body toward the inlet, and when this protrusion enters the valve seat, an annular ring is formed between the protrusion and the inner periphery of the valve seat. A clearance is formed, and this clearance is the cross-sectional area of the flow path. Since this cross-sectional area is very small compared to the cross-sectional area of a normal flow path, the check valve body can be rotated greatly when low-pressure and small-flow water flows. .

Moreover, the flowing water detection apparatus of patent document 2 is provided with the skirt which protruded in the taper shape at the valve seat contact side of the valve body. Thereby, the passage area of the fluid from the primary side to the secondary side of the communication port is reduced, and the valve body is greatly rotated even when a small amount of water flows.
Japanese Patent No. 3631843 JP 2005-292113 A

  In the swing check type water flow detection device of Patent Documents 1 and 2, a gap-shaped throttle part is provided between the valve body and the flow path, and the valve body tries to move greatly even when there is little water flow by this throttle part. The gap-shaped throttle part can be provided on the primary side or body side of the valve body. However, in consideration of pressure loss or fixing of the valve body to the spindle, It was difficult to install unless it was the primary side of the body.

  Therefore, these water flow detection devices have a protruding throttling portion formed on the primary side of the valve body. However, when parts are attached to the valve body in this way, it becomes difficult to rotate due to an increase in weight. There has been a problem that the operation becomes unstable, and the valve body holding portion such as the valve shaft becomes thick to support this heavy weight valve body, resulting in complicated manufacture. In particular, since the arc-shaped protrusions and the skirt-shaped portion are difficult to manufacture, there is a problem that the cost increases. Furthermore, the increase in the number of parts required time and effort for the production, and maintenance work was also troublesome. Furthermore, since it is necessary to store the protruding parts inside the body, there is a problem that the entire apparatus is enlarged.

  The present invention has been developed as a result of intensive studies in view of the above-described actual circumstances. The purpose of the present invention is that when a predetermined flow rate of water flows in the occurrence of a fire, A water flow detection device that can accurately detect the occurrence and scale of a fire by operating the valve accurately, allowing water to flow while preventing pressure loss, simplifying the internal structure, and facilitating production and maintenance It is in providing the compact flowing water detection apparatus which can be performed.

In order to achieve the above object, according to the first aspect of the present invention, an annular seat is provided in a body having an inflow port and an outflow port, and the ball valve body seated on the seat is formed into an arcuate guide portion . The other end of the ball guide whose base end is pivotally attached to the spindle is provided so as to be able to be pressed along with the movement of the ball valve body, and on the inner peripheral surface of the secondary side of the seating portion. A throttle-shaped throttle path is provided, and an inner peripheral surface of the throttle path is formed in a substantially pipe shape, and the guide portion is interposed between the pipe-shaped throttle flow path inner peripheral surface and the ball valve body outer peripheral surface. The throttle channel has a small clearance, and the length of the throttle channel is such that the rotation angle of the spindle that rotates as the ball valve body seated on the seating part moves is 30 °. And at the tip of the throttle channel A water flow detection device adapted to emit a release signal for the ball valve element via a sensing mechanism by the rotation of the spindle with the pressing operation of the ball valve body location.

According to the present invention , when a water flow of a predetermined flow rate occurs in the event of a fire, the water flow detection device can accurately detect the occurrence of a fire by operating the valve body accurately by this water flow. Thus, it is possible to provide a compact water flow detection device that can pass water while preventing pressure loss and that can be easily manufactured and maintained by simplifying the internal structure. Furthermore, since the body can be easily manufactured by casting or the like, it can be manufactured while suppressing the cost.

And it is a flowing water detection apparatus which can enlarge the force which a valve body receives from flowing water, and can act | operate a valve body reliably with small pressure by minimum flow volume, and can detect flowing water.

Further , the present invention is a flowing water detection device that can move the ball valve body greatly even with a small flow rate, and can reliably detect the flowing water by rotating the spindle greatly by the movement of the ball valve body.

An example of the flowing water detection device in the present invention will be described in detail based on the embodiment.
The apparatus main body 1 is installed, for example, between a primary side and a secondary side of a water discharge channel (not shown), and is installed on the primary side of a sprinkler (not shown).
As shown in FIGS. 1 to 3, the apparatus main body 1 includes a valve body 11 and a detection mechanism 30, and the body 11 includes a ball valve body 12, a guide portion 20, and a ball guide 14. .

  The body 11 has an inflow port 11 a on the primary side and an outflow port 11 b on the secondary side. The inflow port 11 a and the outflow port 11 b are communicated with each other through a flow path 13. The body 11 is formed by casting means such as cast iron or stainless steel, and a seat ring 44 is screwed into the body 11 at a position where the ball valve body 12 is seated. The seat ring 44 is used for the ball valve body 12. The seating part 45 is provided.

The ball valve body 12 is built in the body 11, moves in the body 11, and sits on the seat portion 45 so that the flow path 13 can be opened and closed.
The ball valve body 12 is made of rubber or synthetic resin, or is formed by surrounding rubber or synthetic resin on the outside of a metal sphere (not shown), and has an outer diameter larger than that of the seating portion 45 and the outlet 11b. Yes. Further, in the case of the ball valve body 12 having a structure having a metal sphere, the outer diameter is made larger than the width of the seat portion 45, the outlet 11b, and the guide portion 20 in order to prevent the metal sphere from popping out. It is effective to do. Alternatively, a protrusion (not shown) may be provided on the seat 45 and the outlet 11b, and the outer diameter of the metal sphere may be formed larger than the protrusion to prevent the protrusion.

  The guide portion 20 is formed inside the body 11, and the ball valve body 12 seated on the seat portion 45 is movably provided while being guided by the guide portion 20, and the passage 13 is prevented from moving toward the outlet 11 b side. Can be opened. The width W of the guide portion 20 is formed to be smaller than the outer diameter D of the ball valve body 12 in FIG. 4, whereby the ball valve body 12 opens the flow path 13 after the ball valve body 12 is accommodated in the body 11. When moving to the side, the body 11 is movable along the guide portion 20.

  The detection mechanism 30 is provided separately from the body 11, and the movement of the ball valve body 12 is transmitted to the limit switch 50 that is a detection unit so that the detection mechanism 30 detects a signal at the time of detecting flowing water. It is a thing. The detection mechanism 30 is provided with a delay mechanism 39.

The body 11 is provided with a throttle-shaped throttle path 65 within a predetermined movement range R of the ball valve body 12 on the secondary side of the seating portion 45. The throttle path 65 is provided in a reduced diameter so that the ball valve body 12 rises along the flow path 13 to a position where the ball valve body 12 turns on the detection mechanism 30. In the present embodiment, the throttle path 65 has a rotation angle of a spindle 15 provided on a ball guide 14 (described later) that rotates with the movement of the ball valve body 12 when the ball valve body 12 moves. The length L is set to 30 °. This length L is about 30 mm in this embodiment.
In FIG. 4, the throttle path 65 is formed in a substantially pipe shape, and the inner peripheral surface of the throttle path 65 and the outer peripheral surface of the ball valve body 12 have a clearance CL of about 1 mm.

FIG. 10 shows the flow rate characteristics of the apparatus main body 1 according to the present invention and the flow rate characteristics of a general flow rate adjustment valve (for example, a globe valve) by a solid line and a two-dot chain line, respectively.
In this graph, the state of the apparatus main body 1 when the flow rate is 10% is shown in FIG. 2, and at this time, the valve opening is 30% open. On the other hand, a general flow rate adjusting valve has a valve opening degree of 30% at the same flow rate of 10%. Thus, the apparatus main body 1 can take a larger opening with a smaller flow rate than a general flow control valve, and the throttle path 65 extends from a seated state to an opening range of 30% of the valve opening. By providing, it will be in a fully open state earlier, and exhibits high functionality as a running water detection device.

  An opening 17 larger than the diameter of the ball valve body 12 is formed in the body 11 in the vicinity of the tip of the guide portion 20, and the ball valve body 12 can be stored and taken out from the opening 17. Further, a cover 18 is detachably fixed to the opening 17, and the opening 17 communicating with the flow path 13 is covered with the cover 18. The cover 18 is fixed to the body 11 with bolts and nuts (not shown). If the cover 18 is removed by removing the bolts and nuts, the opening 17 can be opened.

  The ball guide 14 is formed in a substantially U shape by a thin plate as shown in FIGS. 1 and 6, and the ball guide 14 is fixed to a spindle 15 rotatably provided in the moving direction of the ball valve body 12 with a bolt 14 a. And I am wearing it. Further, the cover 18 is provided with a spindle 15 that pivotally mounts the pivot portion 14 b of the ball guide 14. As a result, the number of parts and the number of assembling steps are reduced to facilitate installation. The ball guide 14 is attached so as to protrude toward the guide portion 20 within a predetermined movement range R of the ball valve body 12, and is pressed and rotated when the ball valve body 12 moves along the guide portion 20. Like that. At this time, the ball guide 14 rotates around the spindle 15, and the movement of the ball valve body 12 is transmitted to the detection mechanism 30 via the ball guide 14 by the delay mechanism 39.

  The spindle 15 is attached so as to penetrate the cover 18, and one end side thereof is projected outward from the body 11 so that the rotation of the ball guide 14 can be transmitted to the outside of the body 11. On the outside projecting side of the spindle 15, a parallel two-surface portion 15 a is provided by cutting out the vicinity of the end portion in parallel. Further, a seal member (not shown) is interposed in the axially attached portion of the spindle 15 in the cover 18 to prevent water leakage from this portion.

  As shown in FIG. 3, a stopper portion 11e is provided at an upper position near the opening 17 of the body 11, and when the spindle 15 continues to rotate, the ball guide 14 abuts against the stopper portion 11e and rotates. It has a structure that stops. Thereby, the ball valve body 12 does not enter the inside of the cover 18, and the ball guide 14 is guided by the stopper portion 11 e and opens the valve in a stable state.

  The ball disc 41 is attached to the primary side of the seat ring 44 with the ball sheets 42 and 42 being attached to the primary and secondary sides, and the insert 43 is attached and fixed to the body 11 by screwing from the primary side of the ball disc 41, A ball valve 40 is configured on the inflow port 11a side.

  The ball valve 40 is mainly used for water stop after completion of fire extinguishing, and is also used for water stop when the apparatus main body 1 is tested. When the water stops, a stem (not shown) pivotally attached to the ball disc 41 is rotated manually or automatically to close the flow path. In this example, the ball valve 40 is integrally incorporated in the body 11, but may be provided separately from the body 11 and connected to the pipe so as to be in series. Further, instead of the ball valve 40, a valve such as a butterfly valve may be provided.

In addition, a drain port 21 is formed so as to communicate with the flow path 13, and the water in the body 11 can be drained from the drain port 21.
In FIG. 1, the drain port 21 is provided at a position as far as possible from the guide portion 20 where the upper ball valve body 12 moves. The ball valve body 12 is more effective because the pressure hardly escapes from the drain port 21. Is in an open state. A ball valve 22 is connected to the drain port 21 by screwing, and the ball valve 22 is opened and closed so that the body 11 can be drained. The ball valve 22 is opened and closed by manually operating the operation handle 23 as shown by the arrow in FIG.

  Since the drain port 21 is provided at a position away from the guide portion 20, there is a concern that water may remain between the drain port 21 and the ball valve body 12 when drained. For example, the problem can be solved by providing a plug (not shown) on the cover 18 or the like and draining water from the plug.

  In the vicinity of the inflow / outflow ports 11a and 11b of the body 11, communication passages 11c and 11d communicating therewith are provided, and pressure shut-off valves 24 and 24 are provided in communication with the communication passages 11c and 11d, respectively. Furthermore, pressure gauges 25 and 25 are provided on the secondary side of the pressure cutoff valves 24 and 24.

  The pressure gauge 25 is generally attached to a flowing water detection device. In particular, when the pressure shut-off valve 24 is interposed between the pressure gauges 25 as shown in FIG. 1, the inside of the body 11 and the body 11 are mounted. When the water is filled in the pipe, the pressure gauge 25 can be prevented from being damaged due to a sudden pressure increase by keeping the pressure shut-off valve 24 closed. In addition, when the pressure gauge 25 is replaced or maintenance is performed, it can be easily performed by closing the pressure gauge 25 in the same manner.

The detection mechanism 30 shown in FIGS. 7 to 9 includes a ball valve body 12, a ball guide 14, a spindle 15, an operating member 31, a spring 32, a rotary damper 33, a rotating body 34, a tension spring 35, and a limit switch 50. ing. The detection mechanism 30 is configured to be able to transmit the delay to the limit switch 50 in response to the rotation of the spindle 15 when the ball valve body 12 presses the ball guide 14 and the spindle 15 rotates.
The delay mechanism 39 includes an operating member 31, a spring 32, a rotary damper 33, a rotating body 34, and a tension spring 35, so that transmission to the limit switch 50 can be delayed.

The operation member 31 is formed in a substantially plate shape. The link rod 36 connects the actuating member 31 and the spindle 15. The concave two-surface portion 36 a formed on one end side of the link rod 36 is fitted to the parallel two-surface portion 15 a of the spindle 15, and the other end side is connected. The operation member 31 and the spindle 15 on the body 11 side are pivotally attached by the link rod 36 by being fixed to one end side of the operation member 31 with a fixing nut 37. Thus, one end side of the operating member 31 is fixed coaxially with the ball guide 14, and the operating member 31 can be rotated along with the rotation of the ball guide 14.
Further, the other end side of the operating member 31 is provided with a protruding portion 31a formed to protrude like a pin. The protruding portion 31a can rotate around the link rod 36 when the spindle 15 rotates.

  A mounting hole 31b is formed near one end of the actuating member 31, and a spring 32 is mounted in a stretched manner between the mounting hole 31b and a latching portion 30a such as a bolt provided in the detection mechanism 30. . A tensile force is applied to the spring 32, and by this tensile force, the operating member 31 is normally rotated in the pulling direction and locked to the rotating body 34 as shown in FIG. The ball guide 14 attached to the spindle 15 is rotated in the seating direction of the ball valve body 12.

  The rotating body 34 is provided with a locking portion 34b that can be locked with the protruding portion 31a of the operating member 31 on one end side, a mounting hole 34c for mounting the tension spring 35 on the other end side, and the locking portion 34b and the mounting hole. A mounting hole 34a is provided at a central portion with 34c. Further, a pressing portion 34d for pressing the limit switch 50 is provided on the tension spring 35 mounting side. The rotating body 34 is mounted coaxially with the rotating shaft 33a of the rotary damper 33 in the shaft mounting hole 34a. When the rotating body 34 rotates, the rotary damper 33 is operated as described below.

  One end side of the rotating body 34 is provided with a locking portion 34b that can be locked with the protruding portion 31a on the operating member 31 side. The locking portion 34b is used as a tensile force of the spring 32 with respect to the protruding portion 31a. It is locked from the opposite side. Moreover, it attaches in the state which applied the tension | pulling force of the tension | pulling spring 35 between the attachment holes 34c of the other end side of the rotary body 34, and latching parts 30b, such as a volt | bolt provided protrudingly in the housing 30c. The rotating body 34 is provided so that the limit switch 50 can be operated by rotating the switch pressing portion 34d on the other end side by the tensile force of the tension spring 35 when the engagement with the operating member 31 is released.

The rotational force of the rotator 34 due to the tensile force of the tension spring 35 is made smaller than the rotational force of the actuating member 31 due to the tensile force of the spring 32, so that the rotator 34 turns on the limit switch 50 when there is no fire. It does not rotate in the direction to prevent malfunction.
The latching portion 30b can be provided at an appropriate position of the housing 30c. By changing the position of the latching portion 30b, the tensile force of the tension spring 35 can be adjusted, and the delay time by the rotary damper 33 can be changed. Yes.

  Further, a hexagon bolt / nut 38 is provided on the side of the rotary body 34 where the tension spring 35 is attached, and the rotary body 34 is made to act by using the hexagon bolt / nut 38 as a weight. Thereby, in addition to the tensile force of the tension spring 35, torque due to the weight of the hexagon bolt / nut 38 is applied to the rotating body 34. The hexagon bolt and nut 38 can be omitted by increasing the tensile force of the tension spring 35.

The pressing portion 34d is provided so as to project in the pulling direction of the tension spring 35, and when the rotating body 34 rotates, the pressing portion 34d can reliably contact and separate from the contact 51 of the limit switch 50 to turn the limit switch 50 on and off. I am doing so.
Further, the base end portion 35 a of the tension spring 35 on the rotating body 34 mounting side can be provided at an appropriate position of the delay mechanism 39.

The rotary damper 33 is fixed to the housing 30c of the detection mechanism 30 with a bolt or the like (not shown), and is fixed coaxially with the central portion of the rotating body 34.
The rotary damper 33 is configured so that the load in one direction of rotation is greater than the rotation in the other direction, and a commonly used one can be used. Thereby, the load in the direction in which the spindle 15 rotates when the water is passed by the ball valve body 12 is set to be larger than the load in the rotational direction in which the spindle 15 returns to the original state when the water stops.

  For example, the rotary damper 33 is housed so that the outer peripheral sliding surface of the sliding plate is brought into contact with the inner peripheral sliding surface of a cylindrical case (not shown), and a highly viscous fluid such as grease is enclosed in the cylindrical case. However, there is one in which a load is generated by utilizing a rotational reaction force caused by a highly viscous fluid. Furthermore, in this case, in order to generate a rotational reaction force in only one direction, there is a type in which a ratchet wheel is interposed between the sliding plate and an input shaft for inputting to the sliding plate. In addition to these, there are various rotary dampers. In the present invention, various rotary dampers can be used regardless of the structure of the rotary damper.

Subsequently, the operation of the apparatus main body 1 will be described.
When a fire occurs in the apartment house where the apparatus main body 1 is installed, and a sprinkler head (not shown) is opened by this fire and water discharge begins, the ball valve body 12 in the body 11 starts to move.

  During the period from when the ball valve body 12 is seated on the seating portion 45 until it comes into contact with the ball guide 14, the ball guide 14 does not operate in this moving space. Even if it moves due to water leakage, the detection mechanism 30 is not affected.

  4 shows a state in which the ball valve body 12 is seated on the seating portion 45, but the inner diameter d of the flow path on the secondary side of the seating portion 45 is slightly smaller than the outer diameter D of the ball valve body 12. Since the diameter of the throttle path 65 is increased to provide a very small clearance CL of about 1 mm between the inner peripheral surface of the throttle path 65 and the outer peripheral surface of the ball valve body 12. The flowing water does not increase rapidly from the seated state until the flow path 13 is opened by the movement of the ball valve body 12.

Subsequently, the ball valve body 12 moves along the guide portion 20, and when the ball valve body 12 comes into contact with the ball guide 14, it moves while pushing up the ball guide 14, and the spindle 15 fixed to the ball guide 14 rotates. . When the spindle 15 rotates, the operation member 31 fixed to the tip end side of the spindle 15 rotates along with the rotation.
At this time, the ball valve body 12 is set to 0 ° when the ball valve body 12 of FIG. 1 is seated, and from this state, the ball valve body 12 is rotated until the spindle 15 rotates to an angle of about 30 ° as shown in FIG. Moves so as to rise in the throttle path 65.

When the ball valve body 12 moves to the state shown in FIG. 2 (when the ball valve body 12 rises to a height of about 30 mm from the seating portion 45), as shown in FIG. Has a gap S larger than the clearance CL, and a larger flow rate of water flows in the gap S.
Further, in this state, the contact of the limit switch 50 is pushed as described later by the action of the spindle 15 fixed to the ball guide 14, and the open state of the valve is detected.

  In the state shown in FIG. 2, the throttle path 65 is set to have a diameter that allows at least 50 L / min, which is the minimum operating flow rate, to flow, so that the ball valve body 12 reliably starts moving with a small flow rate through the throttle path 65. To do. Further, when the ball valve body 12 moves in the throttle path 65, the area gradually increases in diameter from the clearance CL to the gap S, and the flow rate increases.

  When the ball valve body 12 further moves, as shown in FIG. 3, the ball guide 14 pushed by the ball valve body 12 comes into contact with the stopper portion 11e, and the movement of the ball valve body 12 and the rotation of the ball guide 14 are stopped. The valve is fully opened. At this time, as shown in FIG. 6, a maximum gap S ′ is generated between the ball valve body 12 and the flow path 13, and this gap S ′ has a maximum flow rate (for example, 350 L / min in the case of a caliber 40A) Water flows.

  The amount of water discharged from the sprinkler head varies depending on the number of opened heads, but in the case of the aperture 40A, the minimum flow rate required to detect a fire is 50 L / min and the maximum flow rate is 350 L / min. It is possible to detect from the minimum flow rate to the maximum flow rate by setting the ball valve body 12 for flowing the minimum flow rate to the state of FIG. 2 and the ball valve body 12 for flowing the maximum flow rate to the state of FIG. Become. In particular, when the ball valve body 12 is operated at the minimum opening when the minimum flow rate is 50 L / min, even if the water discharge amount of the entire sprinkler increases and the flow rate of each sprinkler decreases, it is ensured. Can be detected.

  On the other hand, in the detection mechanism 30 (delay mechanism 39), the operating member 31 is normally pressed in the direction in which the ball valve body 12 is closed by the tensile force of the spring 32 as shown in FIG. Since the rotational force of the spindle 15 rotated by the ball valve body 12 is set to be larger than the rotational force of the actuating member 31 by force, when the ball valve body 12 moves to the state of FIG. The operating member 31 rotates as shown in FIG.

  In the rotating body 34, the engaging portion 34b is engaged with the protruding portion 31a of the actuating member 31, so that the rotating portion 34 is normally pulled by the spring 32 as shown in FIG. Although it is held in a state of being separated from 51, when water flows and the operating member 31 rotates to the valve opening side, the projecting portion 31a of the operating member 31 rotates so as to be separated from the locking portion 34b. The body 34 can be freely rotated.

  The rotating body 34 is provided with a tension spring 35 that rotates in the direction of pulling toward the limit switch 50 on the other end side of the locking portion 34b, and the rotating shaft 33a of the rotary damper 33 is provided in the shaft attachment hole 34a. Therefore, when the actuating member 31 is unlocked, it slowly starts to rotate about the shaft mounting hole 34a in the tension direction of the tension spring 35.

The delay time from when the ball valve body 12 presses the ball guide 14 and the rotating body 34 can freely rotate until the pressing portion 34d turns on the limit switch 50 is the tension spring 35 and the rotary damper 33. It can be set as appropriate by adjusting in advance the load force due to.
The delay time is preferably set to about 10 seconds, for example, but may be changed depending on the installation location of the apparatus main body 1 or the use conditions. When changing the delay time, the tension spring 35 is attached to the housing. The tensile force can be adjusted by changing the mounting position, and an arbitrary delay time can be obtained.

  As described above, the rotating body 34 rotates slowly due to the load, and after a predetermined delay time has elapsed, the rotation is completed and the limit switch 50 is turned on as shown in FIG. The switch 50 issues a signal notifying the control panel (not shown) that the valve body has been opened. This signal activates an alarm device (not shown) to notify the operation of the sprinkler due to the occurrence of a fire.

  Next, when the fire is extinguished, the ball valve 40 installed on the primary side of the apparatus main body 1 is fully closed to stop water flowing into the water discharge passage. When the flowing water into the body 11 stops, the ball valve body 12 stops the flowing water into the water discharge flow path by fully closing the ball valve 40 installed on the primary side along the guide portion 20 by its own weight.

  Since the operating member 31 rotates so that the protruding portion 31 a presses the locking portion 34 b of the rotating body 34, the rotating body 34 rotates in a direction against the tensile force of the tension spring 35. When the rotating body 34 is rotated, the contact 51 that has been pushed in by the pressing portion 34d as shown in FIG. 8 is opened to switch off, the signal to the control panel is stopped, and the operation of the alarm device is stopped.

  On the other hand, when water with a minute flow rate of about 5 to 10 L / min flows in the apparatus main body 1 due to water leakage or the like, the amount of water is less than 50 L / min. Although it rises, the state of FIG. 2 is not reached, and the operation member 31 does not operate completely.

  When the amount of rotation of the actuating member 31 is small and does not reach the state shown in FIG. 9, the rotating body 34 is in a state in which the rotation is suppressed and stops halfway due to the engaging portion 34 b hitting the protruding portion 31 a. As a result, the limit switch 50 is not turned on, and the off state can be maintained.

  In addition, even if the operating member 31 is completely rotated to a predetermined position, if the time for maintaining this rotating state is shorter than the delay time (for example, 10 seconds), the rotating body 34 is loaded with the load from the rotary damper 33. Is added, the rotating body 34 does not completely rotate. As a result, when the running water time is, for example, 9 seconds, the rotating body 34 operates until immediately before the limit switch 50 is turned on by the tensile force of the tension spring 35. The limit switch 50 is not turned on because it is rotated by the spring 32 and the actuating member 31 presses the rotating body 34 and rotates in the off direction of the limit switch 50. As described above, malfunctions can be prevented when the amount of flowing water such as water leakage is very small.

There are two types of rotary damper 33: one that applies a braking force (load) during both forward and reverse rotations and one that applies a braking force only in one rotation direction and does not apply during reverse rotation. You can select the specifications.
When the former is used, an operation of slowly returning to the fully closed position is performed when flowing water stops, so that an impact force such as a water hammer can be prevented from acting on the pipe.
On the other hand, when the latter is used, since the operation of quickly returning to the fully closed position is performed when running water stops, the water discharge from the sprinkler can be abruptly terminated.

Next, the effect | action in the said embodiment of the flowing water detection apparatus of this invention is demonstrated.
The apparatus main body 1 according to the present invention forms a throttle path 65 within a predetermined movement range R on the secondary side of a seating portion 45 provided in the body 11, and the inner peripheral surface of the throttle path 65 and the outer peripheral surface of the ball valve body 12. Is provided with a small clearance CL of about 1 mm, so that the ball valve body 12 receives a large force from running water and can move even at a minimum flow rate of 50 L / min. The spindle 15 can be rotated up to an angle of 30 ° by 12 operations.

  Thus, the apparatus main body 1 can operate the spindle 15 at a large angle with a small flow rate, and easily detects this flowing water even when water flows at the minimum operating flow rate. For example, the number of operations of the sprinkler changes. Even in such a case, the detection mechanism 30 can be reliably operated to detect the occurrence and scale of a fire. Further, by providing the throttle path 65, the pressure loss can be reduced. For example, in the aperture 40A, the pressure loss can be kept within a specified 0.05 MPa.

  Since the apparatus main body 1 has a ball check type valve structure, it is not necessary to fix the valve body and the spindle, and the throttle path 65 can be provided on the body 11 side on the secondary side of the ball valve body 12. Accordingly, the valve body can be reliably operated while reducing the overall weight, and the body 11 has a simple structure provided with the throttle path 65, so that the number of parts can be reduced. Since it can be manufactured easily, the cost can be reduced.

  Further, by removing the cover 18, the ball valve body 12 can be easily taken in and out, and the seat ring 44 can be easily attached and detached, so that assembly work and maintenance can be performed without trouble, and the work time can be shortened. be able to. For example, if dust or piping rust or the like bites into the sealing surface and the seat leaks, the cover 18 is removed from the body 11, the ball valve body 12 and the seat ring 44 are replaced, and the cover 18 is used as a base. By returning it, the work can be completed easily.

Further, since the flow area of the flow path 13 is reduced to reduce the flow area, the flow velocity is increased, and the valve 13 is provided in a structure that can be fully opened more quickly. It is possible to reduce the size without increasing the overall size.
Further, the guide portion 20 on which the ball valve body 12 moves does not need to be an arc, and can be formed more compactly by reducing the guide portion 20.

  Further, the apparatus main body 1 according to the present embodiment is such that when the ball valve body 12 is operated in the open state, a signal is sent by being delayed by the delay mechanism 39. It can also be used when 12 operates in the closing direction.

  The spindle 15 can be taken out on either the left or right side of the body 11. By providing the apparatus main body with the spindle 15 on each of the left and right sides of the body 11, this apparatus can be used according to the situation of the installation location. The main body can be installed, for example, it can be arranged in a narrow installation place. The spindle 15 can also be provided on the body side.

  The ball guide can be installed on the primary side of the ball valve body 12, and in this case, the ball guide can be operated to force the ball valve body 12 to open.

  Moreover, the flowing water detection device of the present invention can be applied to a standard ball check valve. Normally, the ball check valve is not provided with a mechanism for transmitting the operating state of the valve body to the outside. However, by mounting the ball guide 14 or the spindle 15 as in the above embodiment, the opening degree is displayed on the ball check valve. It can be communicated, and a part for fixing and holding the valve element can be formed at the time of full closing or intermediate opening.

It is sectional drawing which showed an example of the flowing water detection apparatus of this invention. It is sectional drawing which showed the state of the operation | movement start of the flowing water detection apparatus of FIG. It is sectional drawing which showed the full open state of the flowing water detection apparatus of FIG. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is CC sectional view taken on the line of FIG. It is the schematic front view which showed the detection mechanism. FIG. 2 is an operation explanatory diagram illustrating an operation state of a delay mechanism in FIG. 1. FIG. 4 is an operation explanatory diagram showing an operating state of the delay mechanism in FIG. 3. It is the graph which showed the flow characteristic of the main part of an apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus main body 11 Body 11a Inlet 11b Outlet 12 Ball valve body 30 Detection mechanism 44 Seat ring 45 Seating part 50 Limit switch (detection part)
65 Aperture R Predetermined movement range

Claims (1)

An annular seat is provided in the body having an inlet and an outlet, and a ball valve seated on the seat is provided to be movable while being guided by an arcuate guide , and a base end is pivotally attached to a spindle. The other end of the ball guide is provided so as to be able to be pressed in accordance with the movement of the ball valve body, and a throttle-shaped throttle path is provided on the inner peripheral surface of the secondary side of the seating portion to provide an inner peripheral surface of the throttle path. Is formed so as to have a small ring-shaped clearance through the guide portion between the pipe-shaped throttle passage inner peripheral surface and the ball valve body outer peripheral surface, and the throttle The length of the flow path is such that the rotation angle of the spindle that rotates in accordance with the movement of the ball valve body seated on the seating portion is 30 °, and the length of the flow path is located at the tip of the throttle flow path. As the ball valve body is pressed, Water flow detection device is characterized in that so as to emit an opening signal of the ball valve element via a sensing mechanism by the rotation of dollars.

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