JP2012011041A - Flowing water detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operating valve type flowing water detector applicable also to a large bore without energizing a valve element in an opening direction.SOLUTION: The flowing water detector includes a detection rod displaceable while being engaged with the valve element, and one end side of the detection rod is held in the engaged state with the valve element in a valve closed state. A switch device is disposed on the other end side of the valve element, and the switch device is turned on/off by the displacement of the detection rod displaced while being engaged with the valve element by turning of the valve element in the opening direction. The detection rod engaged with the valve element is displaced with turning of the valve element, but engagement with the valve element is released when the detection rod is displaced into a predetermined position, and the detection rod is held in that position by a valve opening time holding means. When the valve element returns into the valve closed state from the open state, the valve element returns into the valve closed state while being engaged with the detection rod held by the valve opening time holding means, and the detection rod returns into the original valve closed time position.

Description

The present invention relates to a water flow detection device that is installed in a fire extinguishing equipment pipe and detects a flow of water inside a filled pipe and outputs a signal, and in particular, between the primary side and the secondary side of a valve body when a water flow occurs. The present invention relates to an operating valve type flowing water detection device that mechanically detects a generated differential pressure and outputs a signal such as a fire signal or an alarm.

The flowing water detection device is installed in a fire extinguishing equipment pipe such as a sprinkler equipment or a foam fire extinguishing equipment, and detects a running water inside the pipe and outputs a predetermined signal (fire signal, alarm). The inside of the flowing water detection device has a check valve structure, and the inside is divided into a primary side chamber and a secondary side chamber by the valve body, and the valve body is always in a closed state separating them. The primary side chamber and the secondary side chamber are always filled with water, the piping connected to the primary side chamber is connected to a water source such as a water storage tank, and the piping connected to the secondary side chamber is connected to a spraying head such as a sprinkler head or foam head. It is connected.

There are various types of water flow detection devices, depending on the detection method. An actuating valve type that outputs a signal is known. This operating valve type water flow detection device has a constant and stable operating flow rate that outputs an alarm, and there is no water channel connected to other systems such as an automatic alarm valve type alarm water channel. There are various merits such as being not affected at all and being able to simply configure the device (see Patent Document 1 as an example of a conventional actuated valve type water flow detector).

JP 2009-136432 A

Patent Document 1 describes a working valve type flowing water detection device corresponding to a large valve diameter installed in a fire extinguishing facility of a general building or a shopping center. This flowing water detection device is equipped with a rod that urges the valve body in the opening direction, and when the valve body is opened, the displacement when the rod rotates in the secondary direction is detected by the switch means and a signal is output. To do.

The flowing water detection device urges the rod in the opening direction to rotate the rod when the valve body is opened. This urging force is an indispensable element for displacing the rod, but since the valving element is urged in the opening direction via the rod, the operation of the valving element is not possible when operating from the closed state to the open state. It has the merit of being agile and increasing the amount of displacement due to rotation. On the other hand, in order to stably seat the valve body on the valve seat during normal times, the force acting in the closing direction of the valve body has to be increased. In order to increase the force in the closing direction of the valve body, a weight is installed on the valve body, but the weight increases and the cost also increases, making it difficult to promote cost reduction of the valve body.

The present invention has been made against the background of the prior art as described above. The object is to provide an operating valve type flowing water detection device that can be applied to a large diameter without urging the valve body in the opening direction.

In order to achieve the above object, the present invention provides the following water flow detection device.

The flowing water detection apparatus of the present invention detects a flowing water generated by a cylindrical main body connected to a fire extinguishing equipment pipe, a check valve structure provided inside the main body, and rotation of the valve body, and outputs a predetermined signal. About the flowing water detection device provided with the switch device to
A detection rod that is displaceable while engaging with the valve body is installed in the vicinity of the valve body, and one end side of the detection rod is engaged with and held by the valve body in the closed state, and a switch device is provided on the other end side. Can be turned on / off by the displacement of the detection rod. When the detection rod is displaced to a predetermined position while being engaged with the valve body when the valve body is opened, the engagement with the valve body is released and the valve is opened. The detection rod is held at the position by the time holding means.
The flowing water detection device of the present invention includes a detection rod that can be displaced while being engaged with a valve body, and one end side of the detection rod is held in a state of being engaged with the valve body in a closed state. A switch device is disposed on the other end side of the valve body, and the switch device is turned on / off by the displacement of the detection rod that is displaced while being engaged with the valve body by the rotation of the valve body in the opening direction.
When the switch device is turned on / off and the pump device installed on the primary side of the flowing water detection device is activated and a large amount of water is sent from the primary side, the valve body rotates to the fully open position. The detection rod engaged with the valve body is displaced with the rotation of the valve body. However, when the detection rod is displaced to a predetermined position, the engagement with the valve body is released and the detection rod is held at that position by the holding means when the valve is opened. Is done. When the valve body returns to the closed state due to its own weight after the pump stops, the valve body returns to the closed state while engaging the detecting rod held by the holding means at the time of opening the valve, You can return to the time position.
In addition, if the detection rod is installed in the part facing the bearing of the valve body, that is, the part away from the bearing of the valve body, when the valve body is opened, the displacement of the bearing part of the valve body is more than the displacement amount of the bearing part of the valve body. The amount of displacement of the opposing portions is greater, and the detection of displacement by the switch device is facilitated. Furthermore, since the operation of the detection rod is independent of the rotation of the valve body, the amount of displacement of the detection rod when the valve body is opened can be reduced by installing the detection rod in the part where the displacement due to the rotation of the valve body is large. It becomes possible to control.

In the flowing water detection device of the present invention, the valve-opening holding means holds the detection rod at a position on the inner side of the trajectory of the rotational movement of the valve body.
When the valve body is fully opened, the detection rod is moored by the holding means at the time of valve opening in a position inside the trajectory of the valve body, that is, within a range inside the trajectory of the edge of the valve body from the rotation axis of the valve body. The When the valve body returns from the fully open state to the closed state, the detection rod is returned to the closed state while being energized and locked, so that the detection rod can also return to the original position.
If the valve body is formed with an abutment that protrudes outward from the valve seat surface on which the valve body is seated, the valve body will close from the open state. In this case, the detection rod can be prevented from being caught between the valve body and the valve seat.

With respect to the flowing water detection device of the present invention, the detection rod is held in a state in which the detection rod is engaged with the valve body by the valve closing holding means in the valve closed state.
When the valve is closed, if the detection rod moves or displaces for any reason, unnecessary force is applied to the valve body, which may cause the valve body to open in the event of a non-fire. It was configured so that the detection rod could not be moved or operated by
Further, when the valve body is opened from the closed state, if the detection rod and the valve body are engaged at the stage of the valve closed state, the detection rod is also displaced while being engaged in the rotation operation of the valve body. At the same time, the holding by the holding means when the valve is closed can be released.

In the flowing water detection device of the present invention, the valve-opening holding means or the valve-closing holding means holds the detection rod by magnetic force.
The holding means at the time of opening or the holding means at the time of closing the valve is configured by a magnet, and the detection rod is configured by a member that can be attracted to a magnet such as iron, so that the detection rod can be held at each predetermined position. Furthermore, when releasing the holding state of the detection rod by rotating the valve body, it can be easily released simply by pulling the detection rod away from the magnet.

In the flowing water detection device of the present invention, one end side of the detection rod is engaged with the valve body by magnetic force.
By installing a magnet at the tip of the detection rod and configuring the valve body with a member that can be attracted to a magnet such as iron, the valve body can be rotated while the detection rod is attracted to the valve body. . When the detection rod is displaced to the holding means at the time of opening the valve, the adsorption of the valve body and the detection rod is caused by the magnetic force. In this case, the rotation of the valve body is not hindered. In addition, with this configuration, the valve-holding holding means can be omitted.

In the flowing water detection device of the present invention, the detection rod is pivotally supported at the intermediate portion, and the switch device can be turned on and off by the displacement of the swinging motion of the detection rod.
The switch device can be turned on / off by the displacement of the detection rod by the pivot of the detection rod with the detection rod pivotally supported at the intermediate portion and the intermediate portion as a fulcrum.

In the flowing water detection device of the present invention, the switch device can be turned on / off by the displacement of the linear movement of the detection rod in the longitudinal direction of the detection rod.
The switch device can be turned on and off by the displacement of the detection rod by the linear movement in the longitudinal direction of the detection rod.

In the flowing water detection device of the present invention, a first lever that can be engaged with the valve body is provided on one end side of the detection rod, and a second lever that turns on / off the switch device is provided on the other end side. Therefore, the switch device can be turned on / off by the displacement of the rotation of the first lever and the second lever by the rotation operation around the axis of the detection rod.
Displacement of the detection rod is provided with a first lever that can be engaged with the valve body on one end side of the detection rod, and a second lever that turns the switch device on / off on the other end side. The switch device can be turned on / off by the displacement of the rotation of the first lever and the second lever by the rotation operation.

In the flowing water detection device of the present invention, the other end side of the detection rod protrudes outside the main body, and the valve-holding means or the valve-closing holding means is installed on the other end side of the detection rod.

The holding means at the time of closing and the holding means at the time of opening the valve hold the detection rod or the first lever at a predetermined position, and are installed at one end of the detection rod or near the displacement range of the first lever. However, the same effect can be obtained even if the valve-closing holding means and the valve-opening holding means are installed on the other end side of the detection rod that protrudes from the main body.

According to the flowing water detection device of the present invention, a size call (“size call” described in the detailed specifications of the flow detection device) that is often installed in a general building is 65A (2-1 / 2 ") to 200A (8"), which is a working valve type structure that can be applied to a relatively large diameter, and can realize a water flow detection device that does not require urging in the opening direction of the valve body. .
Furthermore, by eliminating the need to bias the valve body in the opening direction, the valve body can be lightened, and the cost of the valve body can be reduced as the weight is reduced.

Sectional drawing of the flowing water detection apparatus by one Embodiment of this invention. XX sectional drawing of FIG. YY sectional drawing of FIG. Explanatory drawing of the internal structure of the housing | casing seen from the arrow Z direction of FIG. Explanatory drawing which shows the state which the valve body in FIG. 3 opened. Explanatory drawing which shows the state which the valve body in FIG. 4 opened. Sectional drawing which shows the modification of the flowing water detection apparatus of FIG. Sectional drawing which shows the modification of the flowing water detection apparatus of FIG. Sectional drawing which shows the modification of the flowing water detection apparatus of FIG.

A first embodiment of the present invention will be described below with reference to FIGS.

The flowing water detection device A of the present invention shown in FIGS. 1 to 3 includes a main body 1, a housing 2, and a drain valve 3.

The main body 1 has a hollow cylindrical shape, and the inside is divided into a primary side chamber I and a secondary side chamber II by a partition wall 4. A maintenance opening 1a is formed on the front surface of the main body 1, and the opening 1a is closed by a cover 1b. A communication hole 5 is formed in the partition wall 4, and an annular valve seat 6 is installed on the secondary side chamber II side.

A disc-like valve body 7 is seated on the valve seat 6, and a cylindrical bearing 8 is formed on a part of the periphery of the valve body 7, and a valve rod 9 is inserted into the bearing 8. ing. The valve stem 9 is stretched horizontally inside the main body 1 and is held by the main body 1. The valve body 7 has a check valve structure that can rotate in the direction of the secondary side chamber II around the valve rod 9, and the valve body 7 rotates in the direction of the secondary side chamber II and separates from the valve seat 6. Thus, the fluid in the primary side chamber I can pass through the annular valve seat 6 to the secondary side chamber II.

The valve body 7 includes a valve main body 7a, a convex portion 7b accommodated in a concave portion on the primary side of the valve main body 7a, and a fastening member 7c made of a bolt and a nut for fixing the convex portion 7b to the valve main body 7a. The valve body 7a is made of metal, specifically iron, and an electrodeposition coating layer is formed as a rust-proof coating layer on the entire surface (not shown). Similarly, the convex portion 7b is made of iron on which an electrodeposition coating layer is formed. Here, the valve body 7 is combined with the valve body 7a and the convex part 7b as separate parts. However, the valve body 7 itself may have a shape in which the valve main body 7a and the convex part 7b are integrally formed as one part. it can. The convex portion 7 b enters and is accommodated inside the valve seat 6 in a state where the valve body 7 is seated on the valve seat 6. The convex portion 7b of the present embodiment functions as a protruding skirt portion that forms an orifice in the main body 1 of the flowing water detection device A. Moreover, the convex part 7b functions also as a weight part which ensures the sealing property at the time of closing by immediately returning to the valve closing state when the valve body 7 may be temporarily opened at the time of non-fire. .

A protrusion 10 is formed on the periphery of the valve body 7 so as to protrude from the edge (FIGS. 2 and 3). A first lever 11 </ b> A that is fixedly installed at the end of the lever shaft 11 is installed in the vicinity of the protruding portion 10. The first lever 11A has an engaging portion K that can be engaged with the valve body 7, and the engaging portion K has a U-shaped cross section so as to sandwich the protruding portion 10 from above and below. Engageable with the portion 10. The end portion of the engaging portion K is formed in an arc shape, and has an effect of reducing the frictional resistance with the protruding portion 10 when the valve body 7 rotates.

The lever shaft 11 is installed through the main body 1 (FIG. 2), and the first lever 11A can be rotated by the rotation operation of the lever shaft 11. In this way, the rotation of the first lever 11A due to the opening of the valve body 7 (operation of the spraying head) is converted to the rotation operation of the lever shaft 11 without displacement (movement) in the three-dimensional direction and transmitted. It has become. In the state where the first lever 11A is in contact with the valve body 7, the longitudinal direction of the first lever 11A is substantially horizontal (FIG. 3).

A second lever 11 </ b> B is fixedly installed at the outer end of the main body 1 of the lever shaft 11. As shown in FIG. 4, the second lever 11 </ b> B has an L shape and is made of iron or the like that can be attracted to the magnet. The second lever 11B is connected to the lever shaft 11 with an L-shaped bent portion, and magnet receivers 11C and 11D formed by bending the edge portions are formed at both ends. Magnets M1 and M2 are installed in the vicinity of each of the magnet receivers 11C and 11D. When the valve is closed as shown in FIG. 4A, the magnet M1 and the magnet receiver 11C are attracted by magnetic force.

The magnets M1 and M2 have an action of restricting the rotation range of the second lever and holding it at that position. However, the first lever 11A connected by the second lever 11B and the lever shaft 11 is brought into a predetermined position. It also has a holding effect. More specifically, when the valve is closed as shown in FIG. 4A, the magnet receiver 11C and the magnet M1 are attracted to hold the second lever 11B, but as shown in FIG. The first lever 11A is held in place with the engaging portion K of the first lever 11A engaged with the protruding portion 10 of the valve body 7.

In FIG. 4B, a sprinkler head (not shown) installed on the secondary side II is actuated to open the valve body 7, and the valve is replenished by the amount of water flowing out from the sprinkler head from the primary side I to the secondary side II. The body 7 is in a rotated state. FIG. 4B shows a state on the side of the housing 2 where the second lever 11B is installed, but FIG. 5 shows a state in the main body 1 where the first lever 11A is arranged.

4B, the second lever 11B is in a position slightly rotated counterclockwise from the valve-closed position shown in FIG. 4A. In this state, the second lever 11B is not affected by the magnetic forces of both the magnets M1 and M2, but the engaging portion K of the first lever 11A is connected to the protruding portion 10 of the valve body 7 as shown in FIG. When the valve body 7 is closed for some reason from this state, the first lever 11A is interlocked and can operate in the valve closing direction. On the other hand, when the limit switch 17 is turned on and the pump is started and the valve body 7 is fully opened, the first lever 11A rotates while the engaging portion K and the protruding portion 10 are engaged. Thus, the magnet receiver 11D of the second lever 11B can be rotated to a position where it is attracted to the magnet M2.

FIG. 4C shows a state in which the valve body 7 is fully opened, the magnet receiver 11D and the magnet M2 are attracted to hold the second lever 11B, and the first lever as shown in FIG. 11A is in a state of being held inside the trajectory (illustrated by a two-dot chain line) of the rotating motion of the valve body 7. As a result, when the valve body 7 is closed, the first lever 11A is urged by the closing operation of the valve body 7 to return to the original valve closing position, and the engaging portion K is further connected to the valve body 7. It is possible to make it the state engaged with the protrusion part 10 of this.

One end of the second lever is engaged with the plate-like switch operating piece 21. The switch operating piece 21 has an intermediate portion connected to the rotation axis D1 of the rotary damper D, and can rotate about the rotation axis d1 of the rotary damper D. A weight W is installed on the other end side of the switch operating piece 21 to urge the switch operating piece 21 in the clockwise direction. A switch device (a limit switch 17 described later) is arranged in a direction in which the weight W biases the switch operating piece 21.

The rotary damper D installed in the housing 2 is configured to slow the movement of the switch operating piece 21 whose one end is in contact with the second lever 11B. When the second lever 11B is separated from the switch operating piece 21, the switch operating piece 21 is rotated clockwise by the weight W, but the rotating operation is slowed by the rotary damper D. The switch operating piece 21 can turn on the limit switch 17 after several seconds to several tens of seconds have elapsed from the switch operating piece 21. The rotary damper D of the present embodiment is of a one-way clutch type in which the rotation operation in only one direction is slow. By doing so, when the valve body 7 is closed after being opened, the operation of the lever 11B becomes smooth without delay, so that the closing operation of the valve body 7 is not hindered.

  The housing 2 has a base B formed by bending a plate material in an L-shape and is installed outside the main body 1. Inside the base B, the lever shaft 11, the second lever 11 </ b> B, and the limit switch are provided. 17, terminal block 18, magnets M1, M2, etc. are provided. The base B is covered with a lid member (not shown), and protects electrical members such as the internal limit switch 17 from dust and water.

In the vicinity of the weight W arranged in the base B, a stopper 19 is provided so as to protrude from the base B. The stopper 19 prevents the limit switch 17 and the switch operating piece 21 from interfering with the rotation of the switch operating piece 21.

The drain valve 3 is a valve that discharges the fluid in the main body 1 to the outside during inspection and maintenance. The inside of the drain valve 3 has an angle valve structure, and the discharge port is provided downward in FIG. A handle for opening and closing the drain valve 3 is installed on the front side, and is provided at a position where the handle can be easily operated (FIG. 2).

Then, operation | movement of the flowing water detection apparatus A of this embodiment is demonstrated.

The above-mentioned water flow detection device A is installed in a fire extinguishing equipment pipe, and the primary side chamber I is connected to a water supply device such as a pump (not shown) and a pipe leading to a water source such as a water tank, and a pipe connected to the secondary side chamber II A sprinkler head (not shown) is installed at the end of the head.

The fire extinguishing equipment pipe is filled with water, and the main body 1 of the water flow detector A is also filled with water in the primary side chamber I and the secondary side chamber II. At all times, the valve body 7 is seated on the valve seat 6, and the convex portion 7 b enters and is accommodated in the flow path inside the valve seat 6, so that water flows from the primary side chamber I to the secondary side chamber II. Is blocked. Further, the first lever 11A in contact with the valve body 7 is in a substantially horizontal state, the engaging portion K is in a state engaged with the protruding portion 10 of the valve body 7, and the first lever 11A prevents rotation. The valve is held in the closed position.

When a fire occurs and the sprinkler head installed in the pipe on the secondary side chamber II side operates, the water in the pipe on the secondary side chamber II side is discharged from the sprinkler head and gradually decreases in pressure. The pressure of the water in the secondary side chamber II that has closed the valve body 7 is reduced, so that the valve body 7 is pushed up by the pressure of the water in the primary side chamber I and rotates around the valve rod 9 as a fulcrum.

Since the valve body 7 is opened away from the valve seat 6, the water in the primary side chamber I is sent to the secondary side chamber II. When the valve body 7 is rotated and the water in the primary side chamber I is sent to the secondary side chamber II, the convex portion 7b of the valve body 7 is gradually removed from the inside of the valve seat 6, so that the outer periphery of the convex portion 7b. An orifice-shaped flow path is formed between the surface and the inner peripheral surface of the valve seat 6, and as a result of the valve body 7 being pushed up by flowing water passing therethrough, the valve body 7 rotates greatly even with a small amount of flowing water. .

When the valve body 7 continues to rotate, the valve body 7 opens as shown in FIG. At the same time, the first lever 11A engaged with the valve body 7 also rotates with the lever shaft 11 as a fulcrum in a state in which the protruding portion 10 of the valve body 7 and the engaging portion K of the first lever 11A are engaged. . At this time, the second lever connected by the lever shaft 11 also rotates together with the first lever 11A.

On the other hand, the second lever 11B is held by the magnet M1 in the closed state, but the holding by the magnet M1 is released by the rotation of the first lever 11A and rotates counterclockwise. At the same time, the lever 11B that has been in contact with one end side of the switch operating piece 21 is separated, and the switch operating piece 21 is rotated clockwise by the weight W installed on the other end side, but is connected to the switch operating piece 21. The rotary operation is slowed by the rotary damper D.

The switch operating piece 21 turns on the limit switch 17 with a delay of several seconds to several tens of seconds after the second lever 11B moves away from the one end side. The limit switch 17 is turned on, and the signal of the limit switch 17 is sent to a monitoring device installed in the manager's room through a lead wire connected to the terminal block 18 in the housing 2. The aforementioned pump is activated by a signal from the limit switch 17, and a large amount of water is sent from the water source to the activated sprinkler head.

The valve element 7 is rotated to the fully open position by the momentum of the water supplied by the pump (FIG. 6). When the valve body 7 is rotated to the fully open position, the engagement with the first lever 11A is released. The first lever 11A is held in a state in which the second lever 11B installed on the housing 2 side is attracted to the magnet M2, and the first lever 11A is held in the locus of the rotating motion of the valve body 7 (two-dot chain line). (Indicated by the figure).

Water is sent from the water source to the sprinkler head activated by the fire, and water is continuously sprayed from the sprinkler head to extinguish the fire.

When the pump is stopped after the fire is extinguished, the valve body 7 in the flowing water detection device A rotates in the valve closing direction by its own weight. At that time, the valve body 7 returns to the closed state while energizing and locking the first lever 11A held inside the trajectory of the rotating operation, and the first lever 11A is also in the position when the valve is closed. Return to.

The said embodiment is an example of embodiment of this invention, It is also possible to change and implement in another form. Next, an example of the modification will be described.

In the first embodiment described above, the displacement by the detection rod is configured as the displacement by the first lever 11A and the second lever 11B by the rotation operation of the lever shaft 11, but in the flowing water detection device shown in FIG. The switch device can be turned on / off by the displacement caused by the swing of the detection rod installed in the vicinity of the valve body 7. Since the detailed description of the configuration of the flowing water detection device in FIG. 7 is described in Japanese Patent Application Laid-Open No. 2009-136432, the description of the same structure is omitted.

In the flowing water detection device of FIG. 7, an engagement portion K similar to that of the first embodiment is formed at the tip of the detection rod 31. The engagement portion K can be formed integrally with the detection rod 31, but can also be formed as a separate body. The engaging portion K is formed of a material that is attracted to a magnet such as iron. A magnet M2 is installed above the engagement portion K, and when the detection rod 31 rotates to the position of the magnet M2, the engagement portion K is attracted and held by the magnet M2 (valve open state: as shown by a dotted line in FIG. 7). (Illustrated).

On the other hand, a magnet receiver 32 is installed at the end of the detection rod 31 on the limit switch 17 side, and is formed of a material that is attracted to a magnet such as iron as in the case of the engaging portion K described above. A magnet M1 is installed on the base B in the vicinity of the magnet receiver 32. When the valve body 7 is closed, the magnet receiver 32 and the magnet M1 are attracted to hold the detection rod 31.

In the water flow detection device of FIG. 7 described above, it is possible to omit the magnet M1 and the magnet receiver 32 by configuring the engaging portion K with a magnet. In order to cope with this, the valve body 7 is formed of a material that is attracted to a magnet such as iron, and an iron engaging portion receiver 33 is installed instead of the magnet M2. When the valve is closed, the engaging portion K is attracted to the iron valve body 7 by a magnetic force and is in a holding state. When the valve body 7 rotates, the engaging portion K rotates while adsorbing to the valve body 7 by the magnetic force of the engaging portion K. When the valve body 7 continues to rotate in the opening direction and reaches the vicinity of the engagement portion receiver 33, the engagement between the engagement portion K and the valve body 7 is released, and the engagement portion K is attracted to the engagement portion receiver 33. can do.

Moreover, as shown in FIG. 8, it is also possible to install the detection rod 34 on the primary side I of the flowing water detection device. In the flowing water detection device of FIG. 8, the engaging portion K is made of a magnet as described above, and can rotate while being attracted to the iron valve body 7. The engaging portion K shown in FIG. 8 has a spatula shape and is attracted to the convex portion 7b of the valve body 7 by magnetic force. When the valve body 7 is fully opened, the engaging portion K is separated from the valve body 7 and comes into contact with the inner peripheral portion of the valve seat 6 as indicated by a dotted line. If the material of the valve seat 6 is iron, the engaging portion K and the valve seat 6 are attracted by magnetic force and are held at that position.

Furthermore, as another embodiment, the flowing water detection device shown in FIG. 9 has a configuration in which the switch device can be turned on and off by a displacement caused by a linear movement of the detection rod 35 in the longitudinal direction. 9 is configured such that the switch device is immediately turned on / off when the valve body 7 is opened.

In this embodiment, a detection rod 35 that is in contact from below is provided on a protruding portion 36 that protrudes from the periphery of the valve body 7. The detection rod 35 is installed through the main body 1, one end side is in contact with the above-described protrusion 36, and an engagement portion K formed by a magnet is installed at the tip of the detection rod 35. Thus, the detection rod 35 is held in a state of being adsorbed to the protruding portion 36. A limit switch 17 installed outside the main body 1 is installed on the other end side, and the limit switch 17 is in an ON state by the other end side of the detection rod 35 in a valve-closed state. A magnet M <b> 2 is installed on the other end side of the detection rod 35.

The main body 1 and the valve body 7 are formed of a material that is attracted to a magnet such as iron, and can be attracted to the engaging portion K and the magnet M2.

The operation of the flowing water detection device of FIG. 9 will be described.
In the valve-closed state, the engaging portion K of the detection rod 35 is adsorbed by the valve body 7 and magnetic force, and is in a holding state at that position. When the valve body is opened, the detection rod 35 is displaced upward in the figure while being attracted to the valve body 7 by the magnetic force of the engaging portion K. When the magnet M2 reaches the outer surface portion 37 of the main body 1 due to the displacement of the detection rod 35, the magnet M2 is attracted to the outer surface portion 37 of the main body 1 and the detection rod 35 is held at that position. When the detection rod 35 is displaced, the limit switch 17 is turned off from on, and the flowing water detection device is activated in response to the non-signal output state.

A Flowing water detector
1 body
1a opening
1b cover
2 Case
3 Drain valve
6 Valve seat
7 Disc
7a Valve body
7b Convex part (skirt part, weight part)
8 Bearing
9 Valve stem
11 Lever shaft (detection rod)
11A 1st lever
11B Second lever
11C Magnet holder (holding means when valve is closed)
11D Magnet holder (holding means when valve is opened)
17 Limit switch (switch device)
18 Terminal block
19 Stopper
21 Switch operation piece
D Rotary damper
K engaging part
M1, M2 magnet
W weight (biasing member)

Claims (9)

Flowing water detection comprising a cylindrical main body connected to a fire extinguishing equipment pipe, a valve body with a check valve structure provided inside the main body, and a switch device that detects flowing water due to the rotation of the valve body and outputs a predetermined signal About the device
A detection rod that can be displaced while engaging the valve body is installed near the valve body,
One end side of the detection rod is held in engagement with the valve body in the closed state,
A switch device is arranged on the other end side and can be turned on / off by the displacement of the detection rod.
When the detection rod is displaced to a predetermined position while engaging with the valve body when the valve body is opened, the engagement with the valve body is released and the detection rod is held at that position by the holding means when the valve is opened. A featured water detection device. The flowing water detection device according to claim 1, wherein the valve-opening holding means holds the detection rod at a position inside the trajectory of the rotation of the valve body. The flowing water detection device according to claim 1 or 2, wherein the detection rod is held in a state of being engaged with the valve body by the valve-closing holding means in the valve-closed state. The flowing water detection device according to any one of claims 1 to 3, wherein the valve-opening holding means or the valve-closing holding means holds the detection rod by magnetic force. The flowing water detection device according to claim 1, wherein one end side of the detection rod is engaged with the valve body by magnetic force. The flowing water detection device according to any one of claims 1 to 5, wherein the detection rod is pivotally supported at an intermediate portion, and the switch device can be turned on / off by displacement of the swinging motion of the detection rod. 6. The flowing water detection device according to any one of claims 1 to 5, wherein the detection rod can turn on / off the switch device by a displacement of a linear motion in a longitudinal direction of the detection rod. A first lever that can be engaged with the valve body is provided on one end side of the detection rod, and a second lever that turns on and off the switch device is provided on the other end side, and the detection rod rotates around its axis. 6. The flowing water detection device according to claim 1, wherein the switch device can be turned on / off by the displacement of the rotation of the first lever and the second lever. The other end side of the detection rod protrudes outside the main body, and the valve-holding means or the valve-closing holding means is installed on the other end side of the detection rod. The flowing water detection device according to item.

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