JP2006175080A - Stream sensing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stream sensing apparatus to output a signal depending on a rotation angle of a valve opened by a stream which can be produced at low cost even when a caliber of the stream sensing apparatus is large and can give out the stable signal output when the valve rotates for more than a prescribed angle. <P>SOLUTION: The stream sensing apparatus is so constituted that the inside has a swing chucking type check valve structure, a projection section 26 formed to project closer to primary side than to the contact surface of a seat ring 8 which is a valve base and the valve 9 is disposed on the valve 9, and a space is formed between an outer peripheral surface of the projection section 26 and an inner peripheral surface of the seat ring 8 when the valve 9 is closed, and outputs the signal depending on the rotation angle of the valve 9 by the stream, wherein the projection section 26 can perform the pendular action and an action controlling means 27 to keep the pendular action of the projection section 26 in a prescribed range is disposed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a flowing water detection device installed on fire extinguishing equipment piping such as sprinkler equipment and foam fire extinguishing equipment.

The flowing water detection device is installed on the fire extinguishing equipment piping, the primary side is connected to the water supply means, and the secondary side is connected to the piping where the sprinkler head is installed. The fire extinguishing equipment pipe is filled with water, and the water in the fire extinguishing equipment pipe is discharged from the sprinkler head as soon as the sprinkler head is activated by a fire.

The conventional water flow detection device has a swing check type check valve structure, and the inside of the main body is divided into a primary side chamber and a secondary side chamber by a partition wall. A communication port is formed in the partition wall, and the communication port has a structure that can be opened and closed by a pivoted valve body.

The flowing water detection device is in a state in which the valve body is always closed, and the valve body is rotated by the pressure on the secondary side being lowered due to the opening of the sprinkler head connected to the secondary side, so that the secondary side from the primary side Water flows to the side.

In order to detect the rotation of the valve body at that time and output a signal, the valve shaft fixed to the valve body protrudes outside the main body, and a lever is attached to the protruding portion of the valve shaft. deep. The lever is always in the state of pushing the actuator of the limit switch, and the lever is moved away from the actuator of the limit switch by the rotation of the valve body, and a signal is output. (For example, see Patent Documents 1 and 2.)

The flowing water detection device described in Patent Document 1 outputs a signal when the valve body rotates more than a predetermined angle. In order to eliminate variations in signal output in the vicinity of the predetermined angle, the flowing water disclosed in Patent Document 2 is used. In the detection device, even when the amount of water flowing from the primary side to the secondary side is small by forming an arc-shaped protrusion on the bottom surface of the valve body and reducing the gap area between the protrusion and the flow path, The structure can be rotated greatly.

JP 7-265454 A (page 3-4, FIG. 2) JP-A-9-299502 (page 3-5, FIG. 1)

However, in the flowing water detection device described in Patent Document 2, in order to make the rotation angle of the valve body when outputting a signal the same when the size increases, the protruding portion of the valve body and the flow path The gap between them must be further reduced. Specifically, when the channel diameter is 40 mm and the diameter of the protrusion is 38 mm, the gap area is 122 mm ² , but when the gap area is constant and the channel diameter is 100 mm, the diameter of the protrusion is about 99 mm. Become.

In addition, it is necessary to consider the position dimensions of the parts manufactured as described above. If the position dimensions are not correct, the projecting part will be caught in the flow path when the valve body rotates, and the valve body will rotate. May be disturbed.

In addition to the above, when the size is increased, the shape of the protruding portion is naturally increased, so that the material cost is increased, and it is extremely difficult to form the protruding portion in an arc shape with high accuracy.

Therefore, in the present invention, in view of the above problem, the flowing water detection device that outputs a signal according to the rotation angle of the valve body opened by flowing water can be manufactured at a low cost even when the diameter of the flowing water detection device is large. An object of the present invention is to provide a flowing water detection device capable of obtaining a stable signal output when the lens is rotated more than a predetermined angle.

In order to achieve the above-mentioned object, the invention according to claim 1 is installed on a fire extinguishing equipment pipe, and the inside has a swing check type check valve structure, and a seat ring as a valve seat and a valve body are provided. A protruding portion formed so as to protrude to the primary side from the contacting surface is installed in the valve body, and when the valve body is closed, a gap is formed between the outer peripheral surface of the protruding portion and the inner peripheral surface of the seat ring. In the flowing water detection device that outputs a signal according to the rotation angle of the valve body by flowing water, the protruding portion is a flowing water detection device that can perform a pendulum operation.

The invention according to claim 2 limits the pendulum operating direction of the protruding portion of the flowing water detection device, and the protruding portion performs the pendulum operation in the direction perpendicular to the rotation axis of the valve body. It is a detection device.

The invention according to claim 3 is a structure in which the protruding portion of the flowing water detection device is suspended so as to be capable of pendulum operation in the arc direction with a support member provided on the valve body as an axis. It is a flowing water detection apparatus of claim | item 1.

A fourth aspect of the present invention is the flowing water detection apparatus according to the first aspect, in which operation restricting means for suppressing a pendulum operation of the protruding portion of the flowing water detection apparatus within a predetermined range is installed.

According to the invention of claim 1, since the projecting portion is configured to be capable of pendulum operation, when the valve body performs the opening operation from the closed state, the projecting portion is always suspended vertically, The valve body can be smoothly rotated without the protruding portion being caught in the flow path.

According to the second to fourth aspects of the present invention, there is provided means for suppressing the pendulum operation of the protrusion within a predetermined range so that the protrusion is vibrated only in the direction perpendicular to the axis of the valve element. Thereby, it can prevent that the protrusion part in the suspended state rocks | fluctuates back and forth, right and left, and is caught in a flow path at the time of rotation of a valve body.

The best mode for carrying out the present invention is shown in Examples. In the embodiment, the protrusion is suspended from the center of the valve body, but it is also possible to suspend it at a position off the center of the valve body.

Embodiments of the present invention will be described below with reference to FIGS. 1 is a system diagram of a sprinkler facility in which the water flow detection device of the present invention is installed, FIG. 2 is a cross-sectional view of the water flow detection device of the embodiment, FIG. 3 is a plan view of a valve body and a valve shaft, and FIG. FIG. 5 is a partially enlarged view when the valve body is rotated in FIG. 2, FIG. 6 (a) is a cross-sectional view of the cylinder, and FIG. 5 (b) is a bottom view of the cylinder. To express.

The sprinkler facility shown in FIG. 1 includes a water source 1, a pump 2, a running water detection device 3, and a sprinkler head 4.

The water source 1 is a water tank for storing water used for fire extinguishing, and a large amount of water is stored so that water is continuously sprayed from the sprinkler head 4 which is activated by the pump 2.

As described above, the pump 2 pumps the water from the water source 1, passes through the primary side pipe 5, the flowing water detection device 3, and the secondary side pipe 6, and sends it to the activated sprinkler head 4.

As shown in FIG. 2, the flowing water detection device 3 includes a partition wall 7 and is divided into a primary side chamber I and a secondary side chamber II. A cylindrical seat ring 8 is installed in the partition wall 7, and the upper end surface of the seat ring 8 is a valve seat. A valve body 9 is placed on the valve seat, and the valve body 9 is pivotally supported by shafts 10 and 11 and is rotatably provided.

The valve body 9 has a disk shape, and a bearing 12 through which the shaft 10 is inserted is formed at a part of the periphery. A longitudinal groove 13 is formed on the end of the bearing 12 opposite to the end on which the shaft 10 is inserted, and a parallel surface 14 that can be engaged with the longitudinal groove 13 is formed on one end of the shaft 11. ing. The other end of the shaft 11 is protruded to the outside, and a parallel surface 16 that engages with the cam 15 is formed at the tip. When the valve body 9 is rotated, the shaft 11 engaged with the vertical groove 13 is also rotated, and the cam 15 installed at the outer end is similarly rotated.

The shafts 10 and 11 are passed through the main body from positions facing each other, and are fitted into the bearings 12 and the longitudinal grooves 13 of the valve body 9. The shaft 10 is fixed to the main body by a male screw formed at an intermediate portion. The shaft 11 has a larger diameter at the intermediate portion than both ends, and the inner surface of the lock nut 18 is locked to the step portion 17 at the boundary between the intermediate portion and the end portion. The female screw 19 is installed so as not to come out of the main body by being screwed into a male screw 20 engraved on the outside of the main body.

A cam 15 having a through-hole having the same cross-sectional shape as the cross-sectional shape of the parallel surface 16 at the center and a circular arc portion formed at the periphery is inserted into the parallel surface 16 formed on the tip of the shaft 11 on the side protruding from the valve box. The nut 21 is fixedly installed. When the valve body 9 rotates, the cam 15 fixed to the shaft 11 also rotates, and the arc portion of the cam 15 presses the actuator 22A of the limit switch 22 installed in the vicinity of the cam 15, and the limit switch 22 is activated. To do.

A cylinder 23 is installed at the center of the valve body 9, and a horizontal pin 24 is attached to the inside of the cylinder 23. The horizontal pin 24 is installed in the cylinder 23 after passing through a horizontal hole formed in the upper part of the connecting piece 25, and the connecting piece 25 is installed so as to be rotatable about the horizontal pin 24.

A step portion 25A is formed by a nut at a lower portion of the connecting piece 25, and a thick plate-like disk 26 as a protruding portion is locked to the step portion 25A. The disk 26 is slightly smaller in diameter than the inner peripheral diameter of the seat ring 8. Further, the disk 26 is suspended and pivoted about the horizontal pin 24. In this state, the disk 26 is determined by the degree of clearance between the outer peripheral diameter of the horizontal pin 24 and the inner peripheral diameter of the hole of the connecting piece 25. Is a state that can swing back and forth and left and right.

In this state, if the disk 26 vibrates violently when the valve body 9 is rotated, the disk 26 may be caught on the inner peripheral surface of the seat ring 8 and hinder the rotation operation of the valve body 9. In order to restrict the direction in which the disk 26 swings, a long hole 27 for restricting the movement of the connecting piece 25 is formed in the bottom surface of the cylinder 23 so that the connecting piece 25 can perform a pendulum operation only linearly.

The structure for restricting the pendulum operating direction of the disk 26 is not limited to the description in this embodiment, and the connecting piece 25 and the disk 26 are perpendicular to the rotation axis of the valve body 9. Any configuration that allows only deflection is acceptable.

Further, by making the peripheral edge portions 26A and 26B at the end of the disk 26 and the peripheral edge portion 8A at the inner peripheral end of the seat ring 8 into a spherical surface or a curved surface shape, the disk 26 can be used as the seat ring 8 when the valve body 9 rotates. An effect of preventing the inner peripheral surface from being caught is obtained.

The upper end of the cylinder 23 is configured so that water cannot be passed from the inside of the cylinder 23 to the secondary side chamber II by screwing the cap 28.

The sprinkler head 4 disperses the water in the piping by opening the internal valve body by heat at the time of fire. As for the structure of the sprinkler head, there is one described in JP-A-7-284545.

Next, the operation of the above flowing water detection device will be described.

The sprinkler facility in which the above-described water flow detection device is installed is in a state where the inside of the pipe is filled with water during normal times. When a fire occurs, the sprinkler head 4 installed in the vicinity of the fire is actuated to spray the water filled in the secondary side pipe 6. Since the water in the secondary side pipe 6 flows out from the activated sprinkler head 4, the pressure of the water in the secondary side pipe 6 decreases.

Similarly, since the water pressure in the secondary side chamber II of the flowing water detection device 3 connected to the secondary side pipe 6 also decreases, the force acting on the valve element 9 in the closing direction from the secondary side chamber II side decreases. Since the force that rotates the valve body 9 from the primary side chamber I side becomes larger, the amount of water flowing out from the sprinkler head 4 that is operated by rotating the valve body 9 flows from the primary side I to the secondary side II.

At that time, since the area of the gap between the outer peripheral diameter of the disk 26 and the inner peripheral diameter of the seat ring 8 is small, the valve body 9 rotates more than when the disk 26 is not installed. Further, since the disk 26 is suspended by the horizontal pin 24, the vertical state is maintained without the disk 26 being inclined when the valve body 9 is rotated, so that the disk 26 is formed on the inner peripheral surface of the seat ring 8. The rotation of the catch valve body 9 is not hindered.

When the valve body 9 is rotated, the shaft 11 and the cam 15 are also rotated and the limit switch 22 is operated. The operation of the limit switch 22 outputs a running water signal, and the pump 2 is activated to start water supply to the sprinkler head 4 operated from the water source 1.

When the pump 2 is activated, a sufficient amount of water is supplied from the primary side pipe 5 to the secondary side pipe 6, so that water is continuously sprayed from the activated sprinkler head 4, and the fire can be suppressed.

System diagram of sprinkler equipment in which the flowing water detection device of the present invention is installed Sectional view of the running water detection device of the embodiment Plan view of valve body and valve stem The perspective view explaining the composition of a valve element and a valve stem Partial enlarged view when the valve body rotates in FIG. (A) Cross section of cylinder, (b) Bottom view of cylinder

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water source 2 Pump 3 Flowing water detection apparatus 4 Sprinkler head 8 Seat ring 9 Valve body 10 and 11 Shaft 13 Vertical groove 14 and 16 Parallel surface 15 Cam 22 Limit switch 23 Cylindrical 24 Horizontal pin 25 Connection piece 26 Disc 27 Slot 28 Cap

Claims (4)

  Installed on the fire extinguishing equipment piping, the inside has a swing check type check valve structure, and a protruding part that protrudes from the valve seat contact surface of the valve element is formed. In the flowing water detection device in which a gap is formed between the two, and a signal is output according to the rotation angle of the valve body by flowing water, the protruding portion can perform a pendulum operation. The water flow detection device according to claim 1, wherein the protruding portion of the water flow detection device performs a pendulum operation in a direction perpendicular to a rotation axis of the valve body. The water flow detection device according to claim 1, wherein the protruding portion of the water flow detection device is suspended so as to be able to perform a pendulum operation in an arc direction with a support member provided on the valve body as an axis. 2. The water flow detection device according to claim 1, further comprising operation restriction means for suppressing a pendulum operation of the protruding portion of the water flow detection device within a predetermined range.

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