JP2005253640A - Water flow detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water flow detector having a check valve structure of a swing catch type in its inside, simplifying the structure of a passing area reducing means from a primary side to a secondary side of the water flow detector detecting water flow by a rotational angle of a valve element, and even if the rotational angle of the valve element in a water flow amount when a sprinkler head is operated is small, issuing no erroneous report by the water flow except for a time of operating the sprinkler head. <P>SOLUTION: A columnar or a converging tapered skirt 10 is provided in the primary side of the valve element 2 and the rotational shaft of the valve element 2 and a valve seat 7 are positioned in a same height position. This detector is further provided with a delay means 18, when the valve element 2 is rotationally turned, outputting a signal after a predetermined delay time is elapsed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

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. (For example, see Patent Documents 1 and 2.)

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. The rotation of the valve body at that time is detected and a signal is output.

The flowing water detection device of Patent Document 1 shown in FIG. 6 has an arc-shaped protrusion 41 provided on the primary side surface of the valve body 40, and the flowing water passes from the primary side I to the secondary side II when the valve body 40 is opened. The opening angle θ of the valve element 40 can be reduced by reducing the area.
Has increased. When the opening angle θ of the valve body is large, it becomes clear that the sprinkler head is activated and a predetermined amount of water flows and a small amount of flowing water due to pressure changes or leakage in the piping. You can eliminate false alarms when passing water.

JP-A-9-299501 (page 3-4, FIG. 1) JP 7-265454 A (page 3-4, FIG. 2)

In the flowing water detection device described in Patent Document 1 described above, an arc-shaped protrusion is provided on the valve body as a means for reducing the flowing water passage area. However, the arc-shaped protrusion is formed by cutting. It is difficult, and a special die is required when forming by casting or forging.

On the other hand, in Patent Document 1, in the case where the arc-shaped protrusion is not installed, the rotation angle of the valve body is about half that in the case where the arc-shaped protrusion is provided. It is described that it may be difficult to distinguish between running water other than the operation of, and may cause false alarms.

Therefore, in the present invention, in view of the above problems, the means for reducing the passage area from the primary side to the secondary side has a simple configuration, and even if the rotation angle of the valve body in the amount of water flowing when the sprinkler head operates is small, the sprinkler An object is to provide a water flow detection device that does not generate false reports due to water flow except when the head is operating.

In order to achieve the above object, the invention described in claim 1 is installed on the fire extinguishing equipment piping, and has a swing check type check valve structure inside, and detects flowing water by the rotation angle of the valve body. In the flowing water detection apparatus, a cylindrical or tapered taper-shaped protrusion is provided on the primary side surface of the valve body, and the height of the valve body and the valve seat is provided at the same position. .

The invention according to claim 2 is the water flow detection device according to the above-mentioned water flow detection device, provided with delay means for outputting a signal when the valve body is continuously opened for a predetermined time.

According to the present invention, the projection and the valve body are individually formed by forming a cylindrical or tapered tapered protrusion as the passage area reducing means formed on the primary side of the valve body, and having a shape that can be easily processed. It is possible to configure by combining with screws or the like.

In addition, a delay means is provided so that a signal is output to the outside when the valve body is opened for a predetermined time so that no false alarm is generated even if the rotation angle of the valve body is small. The signal was not output when the valve body was opened when the valve body was refilled due to a general opening or a secondary pressure drop.

In addition, the protrusion acts as a weight, and even when the valve body is opened by temporary running water other than the operation of the sprinkler head, a force always acts in the direction in which the protrusion acts as a weight to close the valve body. doing.

Furthermore, by using an air damper or the like that can be activated with a small force as the delay means, the delay means can be activated even if the valve opening angle is small.

As the best mode for carrying out the present invention, it is possible to increase the rotation angle of the valve body by running water by lengthening the protrusion installed on the primary side of the valve body, but the protrusion is too long Then, the tip of the protrusion may be caught in the flow path. In order to prevent this, the rotation radius of the valve element is increased by setting the position of the protrusion and the position of the rotation axis of the valve element as far as possible, and the protrusion can be prevented from being caught in the flow path.

The delay means is preferably one that can be activated with a small force. Specifically, it is desirable to use an air damper, one using a mainspring, an electronic timer, or the like.

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of the flowing water detection device of the present invention. FIG. 2 is an XX cross section of FIG. FIG. 3 shows valve body rotation detecting means for transmitting the rotation of the valve body to the signal generating means. FIG. 4 shows a state when the valve body rotation detection means of FIG. 3 is in operation.

1 to 3 includes a main body 1, a valve body 2, and a valve body rotation detection means 3.

The main body 1 has a cylindrical shape and flanges 4 and 4 for connecting with pipes up and down, and the inside is divided into a primary side I and a secondary side II by a partition wall 5. The secondary side II of the main body 1 is provided with an opening for maintenance, and the opening is closed by a cover 1A.

A communication port 6 is formed in the partition wall 5, and a valve seat 7 is installed in the communication port 6. A valve body 2 is placed on the valve seat 7, and a cylindrical portion 8 is formed at one end of the valve body 2. A hinge pin 9 </ b> B is inserted into the cylindrical portion 8, so that the valve body 2 is rotatable. It has a structure.

A seal member such as a rubber plate or an O-ring is provided on the valve seat contact surface of the valve body 2, and a skirt 10 that is tapered toward the primary side and protrudes in a tapered shape is provided inside the seal surface. In this case, the passage area of the fluid from the primary side I to the secondary side II of the communication port 6 is reduced, so that the valve body 2 rotates greatly even when a small amount of flowing water is generated.

A longitudinal groove 11 is formed at one end of the cylindrical portion 8 of the valve body 2, and a convex portion 12 formed at one end of the hinge pin 9 </ b> A is joined to the longitudinal groove 11. 9A is driven. The other end of the hinge pin 9A penetrates the main body 1 and protrudes to the outside, and a cam 13 for transmitting the movement of the hinge pin 9A is installed at the end protruding outward.

A hinge pin 9B is inserted through the end of the cylindrical portion 8 opposite to the side where the vertical groove 11 is formed. The hinge pin 9B is slightly smaller in diameter than the inner diameter of the cylindrical portion 8 and passes through the hole 14 from the outside of the main body 1 and is inserted into the cylindrical portion 8 of the valve body 2. In a state where the hinge pin 9B is inserted into the cylindrical portion 8, a gap is generated between the inner diameters of the hinge pin 9B and the cylindrical portion 8. The hinge pin 9B has a male screw 15 at an intermediate portion, and is screwed into a female screw 16 engraved in the hole 14 so as to be detachable.

Next, the valve body rotation detection means 3 will be described. The valve body rotation detection means 3 includes a cam 13, a lever 17, a delay mechanism 18, and a limit switch 19.

The cam 13 has a long hole in the center, and is fixedly installed to the hinge pin 9A in a state where one end 20 of the hinge pin 9A having substantially the same cross-sectional shape is inserted. The cam 13 has a shape in which a disk is cut out, and a hole is formed in the lower end of the arc portion 21 to connect the elastic body 22A. The elastic body 22A urges the cam 13 clockwise, and has a structure that presses the valve body 2 against the valve seat 7 via a hinge pin 9A.

The lever 17 has an “L” shape formed by bending a flat plate, and a bent portion is pivotally supported so as to be rotatable. The horizontal portion 23 is in contact with the arc portion 21 of the cam 13 and is urged downward by the projectile 22B. The vertical portion 24 always presses the push rod 25 that is the starting means of the delay mechanism 18.

The delay mechanism 18 has an air damper structure inside. Since the air damper is described as an example in Patent Document 2 (Japanese Patent Laid-Open No. 7-265454) in the section of the prior art of the above-mentioned residence, description thereof is omitted. As shown in FIG. 4, when the vertical portion 24 of the lever 17 is separated from the push rod 25 by the rotation of the lever 17, air flows into the air damper, and the push rod 25 moves slowly to the limit switch 19 side. Switch 19 is activated.

When the valve body 2 is closed before the push rod 25 operates the limit switch 19, the push rod 25 is pushed back to the original position by the vertical portion 24 of the lever 17, so that the valve body 2 is temporarily opened. However, the limit switch 19 does not operate.

In the flowing water detection device of the present embodiment, the rotation angle of the valve body when the water flow (50 liters per minute, 0.1 MPa) is generated by the operation of the sprinkler head is about 20 °. This is smaller than the rotation angle of the flowing water detection device described in the above-mentioned section of the prior art, but in the present invention, a signal is output when the valve body is opened for a predetermined time by the delay mechanism 18, so the sprinkler head No signal is output when the valve body 2 is temporarily opened due to an operation other than the above.

The limit switch 19 is always used when the switch is OFF, but it is also possible to change the configuration of the valve body rotation detection means 3 and use the switch that is always ON.

Next, the operation in the event of a fire in the above-described water flow detection device will be described with reference to FIG. FIG. 5 is a system diagram of a sprinkler facility in which the flowing water detection device of the present invention is installed.

In the flowing water detection device of the present invention, as shown in FIG. 5, the primary side I is connected to the water source W and the water supply device P, and the secondary side II is connected to the sprinkler heads H, H,. The pipe is always filled with water, the primary side I and the secondary side II are at the same pressure, and the valve body 2 of the water flow detector is in a closed state.

When a fire occurs and the sprinkler head H is activated, water in the pipe connected to the secondary side II flows out of the activated sprinkler head H, and the pressure on the secondary side II drops. When the pressure on the secondary side II decreases, the valve body 2 is rotated by the force that pushes up the valve body 2 by the pressure on the primary side I, and water flows from the primary side I to the secondary side II.

The hinge pin 9A and the cam 13 are rotated by the rotation of the valve body 2, the horizontal portion 23 of the lever 17 is pushed up by the rotation of the cam 13, and the vertical portion 24 is separated from the push rod 25.

The push rod 25 is slowly moved toward the limit switch 19 by the delay mechanism 18 to operate the limit switch 19. The water supply device P is activated by a signal generated from the limit switch 19, and water is supplied from the water source W to the sprinkler head H that has been activated. From the sprinkler head H that has been actuated, water is continuously sprayed to extinguish the fire.

Next, the operation when water flows in the pipe other than the operation of the sprinkler head will be described.

When the valve body 2 is opened due to the vibration of water in the pipe due to the activation of the pump P or the like, the valve body 2 is instantaneously opened and returned to the closed state, so that no signal is output by the delay mechanism 18.

Further, when the fluid in the pipe connected to the secondary side II is depressurized by natural pressure reduction, the valve body 2 opens slightly and water flows from the primary side I to the secondary side II. Since the delay time of the delay mechanism 18 is adjusted in advance by the piping volume on the secondary side II, no signal is output.

Longitudinal sectional view of the flowing water detection device of the present invention XX cross section of FIG. Valve body rotation detecting means for transmitting the rotation of the valve body to the signal generating means The state when the valve body rotation detecting means of FIG. System diagram of sprinkler equipment in which the water flow detector of the present invention is installed Conventional water flow detector

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Valve body 3 Valve body rotation detection means 7 Valve seat 8 Cylindrical part 9A, 9B of valve body Hinge pin 10 Skirt 11 Groove 12 Convex part 13 Cam 17 Lever 18 Delay device 19 Limit switch 22A, 22B Bullet body 25 Push rod

Claims (2)

In the water flow detection device that is installed on the fire extinguishing equipment piping and has a swing check type check valve inside, and detects the flow of water according to the rotation angle of the valve body, a cylindrical or tapered taper on the primary side of the valve body A flowing water detection device characterized in that a projection having a shape is provided, and the rotational axis of the valve body and the height position of the valve seat are provided at the same position.
2. The water flow detection device according to claim 1, further comprising delay means for outputting a signal when the valve body is continuously opened for a predetermined time.

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