JPH07178191A - Automatic alarm valve - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the automatic alarm valve is to perform a transmission confirmation test or recovery work without removing the pressure switch. [Constitution] In an automatic alarm valve which depressurizes the secondary side of the valve body 21 and pushes up the valve body 24 to continue flowing water from the primary side, a part of which flows into the alarm pipes 35 and 36 to activate the pressure detecting means 37. A switching valve 38 is provided in the middle of the alarm pipes 35, 36 to shut off the pressurized water flowing to the pressure detecting means 37 and drain the pressurized water in the alarm pipe 36 reaching the pressure detecting means 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic alarm valve which detects running water in a pipe due to water sprinkling from a sprinkler head and issues an alarm signal.

[0002]

2. Description of the Related Art Conventionally, as an automatic alarm valve of this type, for example, there is one shown in FIG. In FIG. 8, reference numeral 1 is an automatic alarm valve, which is usually composed of a valve body 2, a pressure switch 8 and a drain valve (parent-child valve) 9. Reference numeral 2 denotes a valve body, which has a valve disc 3 which is openably and closably provided, and a valve seat 4 which receives the valve disc 3. A pressure switch pressurizing port 5 is provided at a position of the valve seat 4 which is closed by the valve disc 3, and the pressure switch pressurizing port 5 is connected to an alarm pipe 6 and a pressure switch 8 is connected via a signal stop valve 7. It is connected to the. Further, the pressure switch pressurizing port 5 communicates with a drain pipe 10 provided on the drain valve 9 side through an automatic drip 11 having a function as a check valve.

A drain valve 9 is connected to the secondary side of the valve body 2 via a drain pipe 12, and a drain valve 9 is connected to the primary side of the valve body 2 via an alarm pipe 6. The alarm pipe 6 branches in the middle, and the signal stop valve 7 and the pressure switch 8 are connected. Further, the alarm pipe 6 is connected to the drainage pipe 10 via an automatic drip 11. First, when the fire pump is in a stopped state where the primary pressure P1 on the water supply main side and the secondary pressure P2 on the sprinkler head side are equal, the valve disc 3 of the valve body 2 is The seat 4 is in a closed state. Therefore, the pressure switch 8 is opened to the drain pipe 10 side via the auto drip 11, and no pressure detection output is generated. That is, the pressure switch 8 is in the switch-off state, and the detection output of this switch-off state becomes the non-alarm output of the automatic alarm valve 1.

Next, when the sprinkler head is actuated by a fire, or when the test valve of the end tester is opened for inspection, the valve as shown in FIG. The valve disc 3 of the body 2 opens. Therefore, the pressure switch pressurizing port 5 is opened and pressurized water is supplied to the pressure switch 8 from the alarm pipe 6, so that the switch is turned on, and the pressure switch 8 is turned on to generate a pressure detection output (alarm output).

After that, the recovery work for stopping the alarm output is
This is done by manually closing the primary control valve provided on the primary side of the valve body 2, whereby the flow of water to the valve body 2 is stopped, the valve disc 3 returns to the normal state, and the valve seat 4
Close. The pressurized water in the pressure switch 8 is discharged to the drainage pipe 10 via the auto drip 11. Thus
The pressure switch 8 is restored. The arrow A indicates the direction of flowing water, and the arrows B and C indicate the flowing of pressurized water.

[0006]

However, in such a conventional automatic alarm valve as described above, water is supplied to the alarm pipe,
When the pressure switch is activated, the water supply device automatically operates, and unless water is stopped manually, pressurized water is continuously added to the inside of the pressure switch.
Even if the signal stop valve is operated, the pressurized water from the signal stop valve to the pressure switch is not drained.Therefore, if the water supply device is not stopped as a signal transmission confirmation test during construction or maintenance or when the automatic alarm valve is activated, the signal will not be output. There was a problem that the transmission confirmation test or recovery work could not be performed unless the pressure switch was removed, because the condition of being kept on remained.

The present invention has been made in view of such conventional problems, and it is an object of the present invention to provide an automatic alarm valve capable of conducting a transmission confirmation test or a recovery operation without removing a pressure switch. To aim.

[0008]

In order to achieve the above-mentioned object, the present invention is to reduce the pressure on the secondary side of the valve body and push up the valve body to continue running water from the primary side, part of which is used as an alarm pipe. In the automatic alarm valve that flows in and activates the pressure detecting means, a switching valve is provided in the middle of the alarm pipe to shut off the pressurized water flowing to the pressure detecting means and to drain the pressurized water in the alarm pipe reaching the pressure detecting means. It is characterized by

The present invention is also characterized in that the switching valve is a three-way valve having a lever. Further, the present invention is
When the lever is operated to the normally open position, the pressurized water in the alarm pipe is supplied to the pressure detecting means, and when the lever is operated to the closed position, the pressurized water in the alarm pipe is drained.

The present invention is also characterized in that a plug is connected to the empty connection port of the three-way valve.

[0011]

According to the automatic alarm valve of the present invention having such a structure, the primary of the valve body of the automatic alarm valve is caused by the operation of the sprinkler head, the opening of the test valve of the terminal testing device, or the flow of water from the drain valve. Side and secondary side pressure balance is broken and the secondary side pressure drops below the primary side pressure, so the valve body of the valve body is pushed up and opened, and pressurized water is supplied to the pressure switch pressurizing port that opens to the valve seat. Flows into the alarm pipe to which the pressure detecting means, which is a pressure switch, is connected, and pressurized water flows.

The pressurized water that has reached the alarm pipe flows through the switching valve in the normally open position and the alarm pipe on the pressure switch side to the pressure switch, and the pressure switch sends an alarm signal.
Here, by operating the lever of the switching valve to the closed position, the pressurized water that has reached the alarm pipe on the automatic alarm valve side is shut off so that it does not reach the pressure switch, and at the same time, the empty connection port of the switching valve is unplugged. The pressurized water in the alarm pipe on the pressure switch side passes through the empty connection port of the switching valve and is drained. Thus, the pressure switch stops issuing the alarm signal.

If the water from the water supply device is continuously supplied by returning the lever of the switching valve to the original normally open position again, the pressurized water stopped by the switching valve passes through the alarm pipe again. Then, the pressure switch is flushed with water, and the pressure switch emits an alarm signal again. In this way, it is possible to easily perform the transmission confirmation test or the recovery work of the pressure switch without removing the pressure switch.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 are views showing an embodiment of the present invention.
FIG. 1 is a front sectional view according to an embodiment of the present invention. Figure 1
In the figure, 21 is a valve body of the automatic alarm valve 22, and a valve seat 23 is provided in the valve body 21. Reference numeral 24 denotes a valve disc (valve body) that is seated on the valve seat 23. The valve disc 24 is provided so as to be openable and closable and opens and closes the flow path 25. A primary control valve (not shown) is connected to the primary side of the valve body 21, and a water supply pipe (not shown) for supplying pressurized water to the sprinkler head is connected to the secondary side of the valve body 21.

As shown in FIG. 1, the valve body 21 is closed by maintaining the pressure balance between the primary side and the secondary side with the valve seat 23 and the valve disc 24 as contacts. Valve seat 2
A pressure switch pressurizing port 26 is provided at a position closed by the second valve disc 24, and the pressure switch pressurizing port 26 is provided in an alarm water channel 29 formed in the valve body 21 and the valve body 28 of the drain valve 27. It communicates with one end. An auto drip 30 is provided at the other end of the alarm water channel 29,
Is the drain pipe 3 of the drain valve 27 through the auto drip 30.
It communicates within 1.

The drain side of the valve body 21 and the drain valve 27 communicate with each other through a drain passage 32. The drainage channel 32 has a handle 33
Is communicated with the inside of the drainage pipe 31 via a valve body 34 having When the valve body 24 opens the drainage channel 32 by operating the handle 33, the pressurized water on the secondary side of the valve body 21 is drained to the drainage pipe 31 through the drainage channel 32. In the middle of the alarm water channel 29, alarm pipes 35 and 36 communicating with the alarm water channel 29 are connected, and a pressure switch 37 as a pressure detecting means is connected to the alarm pipe 36.

A three-way valve 38 as a switching valve is connected between the alarm pipe 35 and the alarm pipe 36. The right side connection port in the figure of the three-way valve 38 is connected to the alarm pipe 35 on the valve body 21 side, the intermediate connection port is connected to the alarm pipe 36 on the pressure switch 37 side, and the right side empty connection port does not pass water, but the three-way valve Since there is a risk of water leakage from 38, the plug 39 is connected.

The three-way valve 38 is provided with a lever 40 for switching operation. As shown in FIG. 3, the lever 40
Is operated to a vertical position which is the normally open position, the alarm pipe 35 and the alarm pipe 36 are communicated with each other, and the pressurized water on the primary side of the valve body 21 is pressurized by the pressure switch pressurizing port 26, the alarm water passage 29, and the alarm pipe 35. , Through the three-way valve 38 and the alarm pipe 36, and as shown by an arrow D, water is supplied to the pressure switch 37.

Next, as shown in FIG. 4, when the lever 40 is operated to the horizontal position which is the closed position, the alarm pipe 36 and the plug 39 side are communicated, and the pressurized water coming from the alarm pipe 35 to the three-way valve 38 is alarm pipe. 36 and the pressure switch 37 so that the pressure switch 3 is shut off and the left empty connection port plug 39 is removed, so that the pressure switch 3
The pressurized water accumulated in the alarm pipes 36 up to 7 is drained.

Next, FIGS. 5 to 7 are views showing the pressure switch 37. 5 is a front open view of the pressure switch 37, FIG. 6 is a side view of the pressure switch 37 with the main body case omitted,
FIG. 7 is a rear view in which the main body case of the pressure switch 37 is omitted. 5 to 7, 101 is the pressure switch 3
7 is a main body case, and the main body case 101 is a main body lid 10.
It is opened and closed by 2. A cap 103 is provided on the top of the main body case 101, and a cap 104 is also provided on the side surface of the main body case 101.

A body 105 is provided at the bottom of the main body case 101.
Is fixed, and the alarm pipe 36 is connected to the threaded portion 106 of the body 105. The body 105 has a diaphragm chamber (not shown) inside, and a diaphragm (not shown) is mounted in the diaphragm chamber. The diaphragm is activated by pressurized water applied from the alarm pipe 36 to the passage of the threaded portion 106.

Reference numeral 107 denotes an operating shaft projecting from the inner case 108. A part of the operating shaft 107 is attached to the center of the diaphragm, and a nut 110 is screwed into the other end via a washer 109. A spring (not shown) is interposed between the bottom wall of the inner case 108 and the step portion of the operating shaft 107, and the operating shaft 107 is constantly urged by the spring so as to return downward.

Reference numeral 120 denotes a link. One end of the link is in contact with the lower surface of the washer 109 of the actuating shaft 107, and the lever 111 is in contact with the other end of the link 120. Normally, the washer 109 causes the link 120 to
Since the rotation around the link fulcrum 121 is suppressed, the lever 111 cannot move either. Working axis 1
When 07 moves upward as indicated by arrow F, the washer 109 also moves upward, so that the link 120, which has been prevented from rotating by the washer 109, rotates about the link fulcrum 121 as indicated by arrow G. That is, since the lever 111 side of the link 121 is slightly displaced from the link fulcrum 121, the other side rotates downward as shown by the arrow H.

Next, the lever 111 in which the contact of the link 120 is released is attached to the micro switch 114 by the spring 122 provided in the micro switch 114 and the weight of the piston in the air damper 112.
The lever fulcrum 123 of 11 is moved to the center as shown by the arrow I, and the contacts provided in the microswitch 114 are closed.

The lever 111 is connected to the piston 113 via a piston shaft 124. To move the lever 111 downward, the piston 113 in the air damper 112 is moved.
When moving downward, the external air is sucked into the air damper 112 through the air passage, so that the air is slowly and gradually. That is, the delay time can be adjusted by adjusting the amount of air entering the air damper 112.

Therefore, a delay adjusting screw 115 is provided on the upper part of the air damper 112, and when the delay time of the pressure switch 37 is erroneously set and the adjustment is necessary, the delay adjusting screw 115 is used to make the adjustment. Delay adjustment screw 115
The amount of air entering the air damper 112 is changed by using a minus driver to adjust the delay time. For example, turning the delay adjusting screw 115 to the left increases the amount of air entering and shortening the delay time, and turning it to the right decreases the amount of air entering,
Delay time becomes long.

Reference numeral 117 is a terminal block, 118 is a telephone jack, and 119 is a through hole. Next, the operation will be described.
In normal times, the water supply system to the pressurized water sprinkler head is filled with a pressurized water supply device, elevated water tank, etc. to prepare for a fire. As shown in FIG. 1, the valve body 21 is closed by using the valve seat 23 and the valve disc 24 as contacts and maintaining the pressure balance between the primary side and the secondary side. Therefore, in this state, pressurized water does not flow to the pressure switch 37, so that the pressure switch 3
7 does not send an alarm signal. That is, the pressure switch pressurizing port 26 opening in the valve seat 23 is closed by the valve disc 24, and the pressurized water on the primary side is supplied to the alarm water channel 29, the alarm pipe 35, the three-way valve 38, the alarm pipe 36, and the pressure switch 37. Does not flow. Therefore, the pressure switch 37 does not emit an alarm signal.

Next, for example, if the test valve of the terminal tester is opened, water will flow, and as shown in FIG. 2, the secondary side of the valve body 21 will be decompressed and the valve disc 24 will be pushed up, from the primary side. Of water continues, and a part of the water flows into the pressure switch pressurizing port 26. The pressurized water flowing into the pressure switch pressurizing port 26 flows into the pressure switch 37 through the alarm water passage 29, the alarm pipe 35, the three-way valve 38 in the normally open position, and the alarm pipe 36.

That is, the body 10 of the pressure switch 37.
When pressurized water enters the passage of the screw portion 106 of No. 5, the diaphragm operates, and the operating shaft 107 connected to the diaphragm moves upward. When the operating shaft 107 moves upward, the contact of the link 120 is released and the link 120 is rotated to rotate the lever 1.
11 also moves downward due to the contact of the link 120 being released, the piston 113 of the air damper 112 connected to the lever 111 via the piston shaft 124 also gradually moves downward, and the outside air inside the air damper 112 is air. Inhaled through the passage.

On the other hand, the downward movement of the lever 111 causes the microswitch 114 connected to the lever 111 to close the contact. Thus, with a predetermined delay time,
The pressure switch 37 sends an alarm signal. Here, as shown in FIG. 4, when the lever 40 is operated to set the three-way valve 38 to the closed position, the pressurized water reaching the alarm pipe 35 does not flow to the pressure switch 37, and at the same time, the three-way valve 38.
When the plug 39 is removed, the pressurized water in the alarm pipe 36 passes through the empty connection port of the three-way valve 38 and is drained, as shown by the arrow E. Thus, the pressure switch 37 stops transmitting the alarm signal.

Then, the lever 40 of the three-way valve 38 is again shown in FIG.
If the water is continuously supplied from the water supply device by operating to the normally open position as shown in, the pressurized water stopped by the three-way valve 38 passes through the alarm pipes 35 and 36 again. Added to pressure switch 37, pressure switch 3
7 again sends an alarm signal. Thus, the three-way valve 38
The lever 40 is switched from the normally open position to the closed position to prevent the pressurized water reaching the alarm pipe 35 from flowing to the pressure switch 37, and at the same time remove the plug 39 to remove the alarm pipe 36.
Since the pressurized water inside was drained, the pressure switch 3
It is possible to perform a call confirmation test or a recovery work without removing 7.

[0032]

As described above, according to the present invention, the switching valve is provided in the middle of the alarm pipe connected from the valve body of the automatic alarm valve to the pressure switch which is the pressure detecting means, and the switching valve is in the closed position. By operating the switch, the pressurized water from the alarm pipe to the pressure switch is stopped, and at the same time the pressurized water in the alarm pipe on the pressure switch side is drained via the switching valve. It is possible to easily carry out a call confirmation test or recovery work.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram during operation.

FIG. 3 is a diagram showing a normally open position of a three-way valve.

FIG. 4 is a diagram showing a closed position of a three-way valve.

[Figure 5] Front open view of the pressure switch

FIG. 6 is a side view in which the main body case of the pressure switch is omitted.

FIG. 7 is a rear view of the main body of the pressure switch with the case omitted.

FIG. 8 is a diagram showing a conventional example.

FIG. 9 is an explanatory diagram of a conventional operation.

[Explanation of symbols]

 21: Valve body 22: Automatic alarm valve 23: Valve seat 24: Valve disc (valve body) 25: Flow path 26: Pressure switch pressurizing port 27: Drain valve 28: Valve body 29: Alarm water channel 30: Auto drip 31: Drainage piping 32: Drainage channel 33: Handle 34: Valve body 35, 36: Alarm piping 37: Pressure switch (pressure detection means) 38: Three-way valve (switching valve) 39: Plug 40: Lever 101: Body case 102: Body lid 103, 104: Cap 105: Body 106: Screw part 107: Actuating shaft 108: Inner case 109: Washer 110: Nut 111: Lever 112: Air damper 113: Piston 114: Micro switch 115: Delay adjustment screw 116: Inner cover 117 : Terminal block 118: Telephone jack 119: Through hole 120: Link 121: Re Click fulcrum 122: Spring 123: lever fulcrum 124: piston shaft

Claims (4)

[Claims] 1. An automatic alarm valve for depressurizing the secondary side of a valve body, pushing up the valve body to continue flowing water from the primary side, and a part of it flows into an alarm pipe to activate a pressure detecting means. An automatic alarm valve, characterized in that a switching valve for shutting off the pressurized water flowing to the pressure detecting means and draining the pressurized water in the alarm pipe reaching the pressure detecting means is provided in the middle of. 2. The automatic alarm valve according to claim 1, wherein the switching valve is a three-way valve having a lever. 3. The pressurized water in the alarm pipe is supplied to the pressure detecting means when the lever is operated to the normally open position, and the pressurized water in the alarm pipe is discharged when the lever is operated to the closed position. The automatic alarm valve according to claim 2. 4. The automatic alarm valve according to claim 1, wherein a plug is connected to an empty connection port of the three-way valve.