JP2008220421A - Switching valve with delay unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switching valve with a delay unit precisely grasping the switching condition of a switching valve while a limit switch does not sensitively react when the main valve of the switching valve temporarily turns on or off by securing an inexpensive delay unit to the switching valve. <P>SOLUTION: The inexpensive delay unit 20 is secured to the switching valve 10, thereby the limit switch 24 does not react sensitively when the main valve 12 of the switching valve 10 temporarily turns on or off, and a control board 90 precisely grasps the switching condition of the switching valve 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an on-off valve of a fire extinguishing equipment such as a sprinkler, and more particularly to an on-off valve as a running water detection device used in a pre-operated sprinkler fire extinguishing equipment.

  Conventional pre-actuated sprinkler fire extinguishing equipment is equipped with an on-off valve, also called a pre-operating valve, in the piping that supplies the water for fire extinguishing. The primary side of the on-off valve is filled with high-pressure fire-extinguishing water, and the secondary side Encloses pressurized air (dry type) or pressurized water (wet type), and provides a closed sprinkler head at the end portion on the secondary side, and installs a fire sensor near the closed type sprinkler head.

  When a fire occurs, the open / close valve is opened by the operation of the fire detector, the high-pressure fire extinguishing water on the primary side is filled up to the sprinkler head, and the sprinkler head is opened by the heat of the fire to release the fire extinguishing water.

  In the pre-actuated sprinkler fire extinguishing system described above, pressurized air or low-pressure water is sealed in the secondary piping, so if the sprinkler head malfunctions due to external impact, etc. No damage caused by water damage. Moreover, the pressure switch for the pressure reducing signal attached to the flowing water detecting mechanism of the on-off valve can detect a decrease in the secondary side pressure when the head is broken and generate a pressure reducing signal. Therefore, the pre-actuated sprinkler fire extinguishing equipment is installed in a place such as an art museum, a semiconductor factory, a clean room, etc. where water loss due to malfunctions other than during a fire is extremely hated.

In order to inform the control device of the on / off status of the on / off valve, a shaft is usually attached to the main valve of the on / off valve. The shaft moves as the main valve opens and closes, contacts and separates directly from the limit switch at a predetermined position, and transmits an opening / closing signal of the opening / closing valve to the control device by turning on / off the limit switch (for example, Patent Document 1).
JP 2003-10355 A

  By the way, the conventional method in which the shaft directly contacts and separates from the limit switch to inform the control device of the open / close state of the open / close valve has the following problems.

  (1) If the opening of the main valve is not sufficient, for example, when flowing water less than the main valve operating flow rate is generated due to a pipe leak, the shaft will contact the limit switch and the open / close valve open signal will be mistaken. Will be sent to the control device.

  (2) When a so-called “jumping phenomenon” occurs in which the main valve opens momentarily and then closes, the shaft contacts the limit switch, and the control device opens a signal that the on-off valve is open. End up.

  (3) When a so-called swaying phenomenon occurs in which the main valve opens and closes intermittently during running water, the shaft contacts and separates from the limit switch and erroneously sends a signal indicating that the open / close valve is open or closed to the control device. End up.

  In view of the above circumstances, the present invention attaches an inexpensive delay device to the on-off valve, and when the main valve of the on-off valve is temporarily opened and closed, the delay switch is provided so that the limit switch does not react sensitively, An object of the present invention is to obtain an on-off valve with a delay device that accurately captures the open / close state.

  The present invention has been made to solve the above-described problems, and is an on-off valve with a delay device, which is provided with a contact lever A and a speed reduction lever B that rotate by providing a rotation shaft at a predetermined position in the longitudinal direction, and the contact A storage spring for hooking the contact lever A while inserting the rotation shaft of the contact lever A; a delay spring for inserting the rotation shaft of the contact lever A and hooking the contact lever A and the deceleration lever B; The speed reduction lever B is composed of a rotary damper having the same rotational axis as the speed reduction lever B and a limit switch. The speed reduction lever B is rotated by the rotation of the contact lever A, and the speed is limited at a predetermined position according to the rotational speed of the rotary damper. A delay device for turning the switch on and off, and a main valve disposed so as to be able to contact and separate with respect to a valve seat that partitions the primary side flow path and the secondary side flow path. Installed in Is characterized by having an on-off valve that moves as the opening and closing of the main valve comprises a shaft for rotating the abutment lever A of the delay device.

  According to the present invention, the contact lever A and the speed reduction lever B that rotate by providing a rotation shaft at a predetermined position in the longitudinal direction, and the storage that hooks the contact lever A while inserting the rotation shaft of the contact lever A. A spring, a delay spring for inserting the rotation shaft of the contact lever A and hooking the contact lever A and the deceleration lever B, a rotary damper having the same rotation shaft as the deceleration lever B, and a limit switch. Since the speed reduction lever B is rotated by the rotation of the contact lever A, and the speed of the speed reduction lever B has a delay device that contacts and separates the limit switch at a predetermined position according to the rotational speed of the rotary damper. It is possible to set a delay time from the start of rotation until the limit switch is turned on and off, and the delay spring and the accumulation spring do not interfere with each other. Since, operating time delay spring deceleration lever B, the recovery time is adjustable only by changing the storage spring. If the delay device is attached to the on-off valve, when the main valve of the on-off valve is temporarily opened or closed, the delay switch is set so that the limit switch does not react sensitively, and the control device It can be accurately captured.

  Further, the contact lever A and the deceleration lever B, the accumulation spring, the delay spring, and the like using the delay device are inexpensive, and a low-cost on-off valve with the delay device can be obtained.

  FIG. 1 shows a monitoring state of a sprinkler fire extinguishing facility with the on-off valve with a delay device according to the first embodiment of the present invention closed. FIG. 2 shows a state in which the on-off valve with a delay device is open and the sprinkler fire extinguishing equipment is discharging fire-fighting water.

  FIG. 3 shows the structure of the delay device, and FIGS. 4 to 9 show the operation process of the delay device.

  The sprinkler fire extinguishing equipment 100 having an on / off valve with a delay device includes an on / off valve 10 called a pre-actuated valve, a delay device 20 installed on the on / off valve 10, and a remote start valve 30 for starting the opening / closing of the on / off valve 10. And a manual start valve 40, a drain valve 50, a pressure switch 60, a sprinkler head 70, a fire detector 80, and a control panel 90 for controlling fire extinguishing equipment.

  The on-off valve 10 is attached to the main valve 12, a valve seat 11 that partitions the primary side flow path K 1 and the secondary side flow path K 2, a main valve 12 that is arranged so as to be able to contact and separate from the valve seat 11, and The shaft 13 is configured to move in accordance with the opening and closing of the main valve, the spring 14, and the piston chamber 15.

  FIG. 3 shows the configuration of the delay device 20. The delay device 20 includes a contact lever A, a rotation axis A1 of the contact lever A, a reduction lever B, a rotation axis B1 of the reduction lever B, a storage spring 21 formed in a spiral shape with a metal wire, and a delay. A spring 22, a rotary damper 23 that has a rotating shaft and gently decelerates and stops the movable portion connected to the rotating shaft; and a limit switch 24 that can be turned on and off by contact and separation from the outside , Is composed of.

  As shown in FIG. 3 and FIG. 4, the contact lever A and the speed reduction lever B are each provided with a rotation axis A1 and a rotation axis B1 at predetermined positions in the longitudinal direction. The contact lever A is hooked and the other end hooks a stopper S1 described later. As a result, the accumulation spring 21 applies a force to the contact lever A so as to rotate in the counterclockwise direction. On the other hand, while the delay spring 22 is inserted into the rotary shaft A1, one end hooks the contact lever A and the other end hooks the speed reduction lever B. In this case, the delay spring 22 does not expand and contract and is in a stationary state.

  The rotation axis B1 of the deceleration lever B is also the rotation axis of the rotary damper 23, that is, the deceleration lever B rotates in accordance with the rotation speed of the rotary damper 23.

  In this delay device 20, the delay spring 22 and the accumulation spring 21 are formed separately and do not interfere with each other. Therefore, the operating time of the deceleration lever B can be adjusted only by changing the delay spring 22, and the recovery time can be adjusted only by changing the accumulation spring 21. ing.

  Next, the operation procedure of the delay device 20 will be described with reference to FIGS.

  FIG. 4 shows a state where the delay device 20 is not operated (monitoring state), and the contact lever A and the deceleration lever B are stopped.

  FIG. 5 shows a state in which the main valve 12 is just opened, and the shaft 13 (dotted line portion) projects to push the contact lever A in the clockwise direction, and the accumulation spring 21 is strongly twisted.

  FIG. 6 shows a state in which the delay spring 22 is twisted when the contact lever A is pushed up, and the deceleration lever B is rotated in the clockwise direction. At that time, the speed reduction lever B rotates slowly due to the speed reduction effect of the rotary damper 23.

  FIG. 7 shows a state where the deceleration lever B contacts the limit switch 24 and the limit switch 24 is turned on after a predetermined delay time has elapsed. If it does so, the open signal of the main valve 12 will be transmitted to the control panel 90 by the limit switch 24, and an alarm will be issued. The deceleration lever B continues to rotate until it hits the deceleration lever B stopper S2.

  In FIG. 8, the contact lever A pushed by the accumulation spring 21 is pulled down by the shaft 13 (dotted line portion) being drawn in a state immediately after the main valve 12 is closed. As a result, the deceleration lever B also rotates away from the limit switch 24. At that time, the speed reduction lever B rotates slowly due to the speed reduction effect of the rotary damper 23.

  In FIG. 9, the speed reduction lever B is separated from the limit switch 24, and the limit switch 24 is in an OFF state. Then, a closing signal for the main valve 12 is transmitted to the control panel 90. The deceleration lever B continues to rotate thereafter, and stops when the contact lever A hits the contact lever A stopper S1, and the delay device 20 is completely restored.

  Next, the operation of the on-off valve 10 using the delay device 20 will be described with reference to FIGS. In this case, a wet pre-actuated sprinkler fire extinguishing system is assumed.

  At all times, in the sprinkler fire extinguishing equipment 100, equipment monitoring pressure is applied to the primary side K1, the secondary side K2 and the piston chamber 15 of the on-off valve. The remote start valve 30 is closed, the pressure in the piston chamber 15 is maintained, and the on-off valve 10 is closed. At this time, when there is a small amount of flowing water on the secondary side K2, the pressure water on the primary side K1 is supplied to the secondary side K2 via the check valve V2.

  When a fire occurs, the fire detector 80 is first activated, and the remote start valve 30 is opened by the signal. When the fire further progresses, the sprinkler head 70 is opened by the heat, and fire-extinguishing water connected to the secondary side K2 is released. When the remote start valve 30 and the sprinkler head 70 are opened, the pressurized water in the piston chamber 15 is released, and the on-off valve 10 is opened (depressurized release). At that time, the pressurized water on the primary side K1 is supplied via the check valve V1, but is discharged to the secondary side K2 through the valve seat 11 as the main valve 12 is opened. By opening the on-off valve 10, the main valve 12 moves away from the valve seat 11, and at the same time, the shaft 13 projects to hit the contact lever A of the delay device 20. When the delay device 20 is activated, the limit switch 24 is turned on after a predetermined delay time has elapsed, and transmits an opening signal for the main valve 10 to the control panel 90. When the control panel 90 receives the signal for opening the main valve 12, it issues an alarm and activates a fire pump (not shown), and fire water is discharged from the sprinkler head 70 via the on-off valve 10 to perform fire fighting activities. .

  According to this embodiment, the delay device 20 gives a certain delay time immediately after the main valve 12 opens (or closes) to the time when the control panel 90 receives this open (or close) signal. Can solve the problem. (1) When the opening degree of the main valve 12 is not sufficient, for example, when flowing water less than the operating flow rate is generated due to leakage of piping, even if the shaft 13 protrudes, the valve does not come into contact with the limit switch 24 immediately. A false signal can be prevented without transmitting an open signal. (2) Even if there is a so-called “jumping phenomenon” in which the main valve 12 is momentarily opened and then closed, there is a delay time, so the control panel 90 does not recognize the opening of the main valve 12 and prevents false alarms. be able to. (3) Even if the main valve 12 opens and closes intermittently, there is a delay time even if a "swing phenomenon" occurs, so the limit switch 24 does not turn on and off each time and sends a false report to the control panel 90. There is no.

  If only the fire detector 80 is activated during a non-fire, the sprinkler head 70 is not opened, so that the on-off valve 10 is kept closed.

  Further, if only the sprinkler head 70 is opened, the residual water (in the case of wet) on the secondary side K2 of the on-off valve 10 is discharged unless the fire detector 80 is activated, but the on-off valve 10 is closed. Thereafter, there is no water discharge from the sprinkler head 70 continuously.

  In the delay device 100 according to the present invention, the parts used, for example, the accumulation spring 21 and the delay spring 22 are almost inexpensive and do not require a complicated structure. Cost can be reduced.

Sprinkler fire extinguishing equipment 100 having an on-off valve with a delay device according to the first embodiment (monitoring state) Sprinkler fire extinguishing equipment 100 having a switching device with a delay device according to the first embodiment (water discharge state) Delay device 20 Delay device 20 is in monitoring state The contact lever A of the delay device 20 is pushed up by the shaft 13 Delay device 20 is in delay state The limit switch 24 of the delay device 20 is turned on The shaft 13 is retracted, and the contact lever A of the delay device 20 is in the returning rotation state. State where deceleration lever B of delay device 20 is rotating in return

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Open / close valve 20 Delay device 30 Remote start device 40 Manual start device 50 Drain valve 60 Pressure switch 70 Sprinkler head 80 Fire detector 90 Control panel 100 Sprinkler fire extinguishing equipment having open / close valve with delay device

Claims (1)

A contact lever A and a deceleration lever B that rotate by providing a rotation shaft at a predetermined position in the longitudinal direction, a storage spring that hooks the contact lever A while inserting the rotation shaft of the contact lever A, and the contact The rotation shaft of the lever A is inserted, and includes a delay spring for hooking the contact lever A and the deceleration lever B, a rotary damper having the same rotation shaft as the deceleration lever B, and a limit switch. The speed reduction lever B is rotated by the rotation of the delay lever B, and the speed of the speed reduction lever B has a delay device that turns the limit switch on and off at a predetermined position according to the rotational speed of the rotary damper.
The delay device has a main valve disposed so as to be able to come in contact with and separate from a valve seat that partitions the primary side flow path and the secondary side flow path, is installed in the main valve, and moves as the main valve opens and closes. An on-off valve with a delay device, comprising an on-off valve having a shaft for rotating the contact lever A of the valve.

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