JP2990537B2 - Accelerator for dry sprinkler equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an accelerator for use in dry sprinkler equipment.

[Prior art] General sprinkler equipment, in which water is filled in a pipe from a water source to a terminal sprinkler head, in a cold region in winter, water in the pipe freezes to burst the pipe, or the sprinkler head is damaged. In addition to destroying the sprinkler head, water may not come out even if a fire occurs and the sprinkler head is activated, resulting in a large fire.

For this reason, in cold regions, dry-type sprinkler equipment is used in which air is filled instead of water in the pipes for mounting the sprinkler head.

Here, the dry sprinkler equipment will be briefly described with reference to FIG.

The dry sprinkler system is equipped with a main pipe 2 for sending water from a water source 1.
And an alarm valve 4 is installed between the pipe 3 to which the sprinkler head S is attached.

The inside of the alarm valve 4 is divided into a primary side I and a secondary side II by a valve body 5. The main side 2 of the water source is connected to the primary side, and the pipe 3 of the sprinkler head is connected to the secondary side. In the dry-type sprinkler system, water is filled up to the primary side I of the alarm valve 4 and the secondary side II is filled with compressed air.

The area where the water on the primary side contacts the valve element 5 is smaller than the area where the compressed air on the secondary side contacts the valve element, and the ratio is about 1: 5. Therefore, if the air pressure on the secondary side is 1/5 or more than the water pressure on the primary side, the force pushing the valve body from the secondary side is stronger and the valve body is in the closed state.

When a fire occurs in a building in which the dry-type sprinkler equipment is installed, the sprinkler head S attached to the end of the pipe 3 operates, and the compressed air in the pipe leaks from the sprinkler head, and the pressure on the secondary side decreases. Then, the valve element 5 which has been closed so far because the pressure on the secondary side is high opens due to the pressure drop on the secondary side and the water on the primary side I is discharged to the secondary side II.
At the same time, a detection device (not shown) in the alarm valve detects the flow of water, starts the pump P installed in the main pipe 2, and further sends water to the secondary side. The water that has flowed into the secondary side pushes out the air in the piping from the sprinkler head because the sprinkler head at the fire occurrence location is open, and then the water flows out to extinguish the fire.

By the way, when the sprinkler head is installed on a pipe with a large floor, the number of sprinkler heads installed increases, so the total length of the pipe becomes very long.
If the floor is narrow, the number of sprinkler heads installed is small, and the total distance is short. If the sprinkler head operates, the air in the pipe will be released and the air pressure will drop, even if the total length of the pipe is long or short, so the valve body in the alarm valve will open. Due to the large amount of air inside, it takes time to reach a low pressure that opens the valve.

Therefore, when a fire occurs on a large floor, it takes time from the operation of the sprinkler head to the actual spraying of water, and the fire may be enlarged. Therefore, the accelerator is designed to sprinkle water from the sprinkler head in a short time even in the event of a fire on a large floor.

The accelerator 6 is installed between a drawing pipe 7 connected to the secondary side II of the alarm valve 4 and a pressurizing pipe 9 connected to a pressurizing chamber 8 around the outlet of the primary side I of the alarm valve.

 FIG. 4 shows a conventional accelerator.

In the conventional accelerator, an opening 11 is formed at an upper portion of a primary side of a main body 10 having a valve mechanism, and a bellows 12 covers the opening. At the center of the bellows 12, a metal fitting 13 having a small hole through which air can flow is fixed to the primary side of the main body. A flow control component 14 is provided above the metal fitting. The lower part of the metal fitting 13 is connected to a stem valve 15, and the stem valve 15 is pushed upward by a normal spring 16 to seal a valve seat 17 of the main body. A chamber 18 is installed at the top of the main body, and a flow control component 14 installed at the top of the fitting is accommodated therein. Therefore, in the conventional accelerator, the change in air pressure in the piping is
13, through the flow control component 14, the pressure in the chamber 18 is influenced. In other words, the air pressure in the piping changes depending on the rise and fall of the temperature and the shock at the start and stop of the compressor that sends compressed air into the piping, but this amount of air enters and exits the chamber through the fitting 13 and the flow control component 14. , Accelerators do not malfunction. Also, when the air pressure in the piping decreases in the event of a fire, reduce the outflow of air in the chamber and create a pressure difference between the chamber and the primary side so that the flow control components do not follow the decrease. It has become.

Electromagnetic valves 21 are provided before and after the accelerator to prevent water flowing into the secondary side of the alarm valve from flowing into the accelerator after the alarm valve is activated. . The solenoid valve is operated by the valve body 5 operating a limit switch 22 provided on the alarm valve.

Here, the operation state of the conventional accelerator will be described.

When a fire occurs and the sprinkler head S attached to the pipe 3 operates and the air in the pipe decreases, the air pressure on the primary side of the accelerator body 10 connected to the secondary side II of the alarm valve 4 and the extraction pipe 7 is reduced. descend. At this time, since the air pressure on the primary side is lower than the air pressure in the chamber 18, the bellows 12 is lowered, the stem valve 15 fixed to the metal fitting 13 opens the valve seat 17, and the drawing pipe 7 and the pressurizing pipe 9 are connected. It becomes a distribution state. Then, the compressed air on the secondary side II of the alarm valve 4 reaches the pressurizing chamber 8 and presses the valve element 5 from below. At this time, the pressure on the secondary side is reduced by the operation of the sprinkler head, and the compressed air at the same pressure as the secondary side is applied to the valve body 5 from the pressurizing chamber 8 near the primary side. Even if the pressure applied to the valve element on the side does not decrease enough to actually open the valve element, the valve element is opened. In other words, the pressure on the primary side I of the valve body of the alarm valve 4 is reduced by the water pressure applied to the portion in contact with the water.
As a result, the force that presses the valve element on the secondary side whose pressure has been reduced becomes stronger than the pressure, and the valve element is opened.

The accelerator accelerates the operation of the alarm valve in this way. However, even if the accelerator is installed, the time from the operation of the sprinkler head to the operation of the alarm valve differs depending on the total length of the piping. Need to be adjusted. In other words, the accelerator reduces the amount of air flowing out of the chamber to the primary side of the main unit so that it operates even if the connected pressure is small, because the secondary air pressure drops slowly when the total pipe length is long. The bellows is lowered by increasing the pressure difference between the chamber and the primary side of the main body, and the valve seat of the main body closed by the stem valve is opened. On the other hand, when the total length of the pipe is short, the air pressure in the pipe decreases relatively quickly, so the amount of air flowing out of the chamber to the primary side of the main body increases, and the pressure difference between the chamber and the primary side of the main body decreases. You have to slow it down. Therefore, it is necessary to be able to adjust the amount of air flowing into and out of the chamber.

In the conventional accelerator, this flow rate adjustment is performed by a flow rate control component in the chamber. The flow control component can adjust the flow rate by changing the size of the holes or grooves through which the air passes.

[Problems to be Solved by the Invention] To increase the amount of air passing through the flow control components of the conventional accelerator, the hole diameter of the flow control components must be increased, and to reduce the throughput, the diameter must be reduced. No. Therefore, it was not possible to set one that was at the total distance of all the pipes. Moreover, since the processing of the flow control component is performed in a chamber sealed with a large number of screws, it takes a great deal of time to remove and install the flow control component.

The sensitivity adjustment of the accelerator is the most actually measured adjustment if it is performed while actually bleeding air with a test valve having a discharge amount of I sprinkler heads. However, if flow control components are installed in the chamber,
Since the chamber had to be removed when adjusting the sensitivity, it did not function as an accelerator at all, and it was not possible to adjust while removing air from the test valve.

An object of the present invention is to provide an accelerator capable of adjusting the flow rate into the chamber without any trouble and performing not only fine adjustment but also adjustment while removing air with a test valve.

Means for Solving the Problems The present invention has been made to achieve the above object, and has a main body having a valve mechanism divided into a primary side and a secondary side;
A bellows that seals an opening at an upper portion of a primary side of a main body; a stem valve that is attached to a central portion of the bellows via a fitting to open and close a valve seat of a valve mechanism; a chamber that is installed so as to cover an upper opening of the main body. An accelerator for dry-type sprinkler equipment, comprising: a bypass for allowing air on the secondary side of the alarm valve to enter and exit the chamber; and a flow control device installed in the bypass.

EXAMPLES The present invention will be described below based on the drawings.

The main body of the accelerator has a valve mechanism. At one end, a male screw 19 that is screwed with the introduction pipe 7 that is connected to the alarm valve is screwed, and at the other end, a pressurized pipe that is connected to the pressurized chamber of the alarm valve. A male screw 20 for screwing the screw 9 is provided. The stem valve 15 is installed in the valve seat 17 in the main body,
The stem valve is always pushed up from below by a spring 16 to seal the valve seat 17. The upper end of the stem valve 15 is connected to a fitting 13 attached to the bellows 12.
The bellows 12 is set so as to cover the upper part of the main body that has become the opening 11, the surroundings are maintained by the chamber 18, and the chamber 18 is fixed to the main body with a number of screws. An adjusting device 30 is provided. The flow control device 30 has an elbow joint shape, and one joint portion 31 is installed in the chamber, and the other joint portion 32 is connected to the bypass 21 communicating with the alarm valve. A nozzle 34 having a hole 33 in the side surface is fixed in the flow rate adjusting device 30. There is a gap between the tip of the nozzle 34 and the inner wall 35 of the flow control device, and a check packing 36 having a V-shaped cross section is provided in the gap. The non-return packing allows air from the left side of the drawing to pass therethrough, but when air tries to pass from the right side of the drawing, the outer periphery of the packing comes into close contact with the inner wall and prevents passage. A cone 37 is provided in the nozzle, and the cone moves forward and backward in the nozzle by rotating an external knob 38. Therefore, when the cone is advanced, the outlet of the nozzle is closed, and when the cone is retracted, there is a gap between the nozzle outlet and the cone.

In the embodiment, the flow control device is shown as being installed directly in the chamber. However, the flow control device may be installed in any place as long as it is on the bypass connected to the secondary side of the alarm valve.

Needless to say, any structure can be adopted as the structure of the flow rate adjusting device as long as it can adjust the flow rate of air.

Next, the sensitivity adjustment of the accelerator of the present invention will be described.

Accelerator sensitivity adjustment involves opening a test valve (not shown) and activating the alarm valve within a predetermined period of time. However, these require adjusting the amount of air flowing out of the chamber of the flow control device. Performed by
That is, when the total length of the piping is long, it takes time for the air to flow out of the activated sprinkler head, so that the amount of air flowing out of the chamber to the bypass is reduced to increase the sensitivity. In other words, if the accelerator flow control device has a cone inside the nozzle as shown in Fig. 2, to improve the sensitivity, the cone should be advanced to reduce the amount of air passing through the nozzle. Since the pressure in the chamber is much slower than the pressure in the chamber, the difference between the pressure in the chamber and the pressure on the primary side of the accelerator body becomes large, and the bellows moves directly below to open the valve of the body. In addition, when the total length of the pipe is short, the pressure of the air drops rapidly during the operation of the sprinkler, so that the amount of air flowing out of the chamber of the flow control device of the accelerator is increased. In this way, the operation time can be adjusted to prevent malfunction.

[Effect of the Invention] Since the accelerator of the present invention can finely adjust the amount of air flowing into and out of the chamber in a stepless manner, optimal conditions can be obtained for the total length of the pipes. In addition to being able to easily remove the chamber without having to remove the chamber, the air amount can be adjusted while opening the test valve at the end of the pipe, which has an unprecedented superior effect, such as being in accordance with the actual situation. ing.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an accelerator of the present invention, FIG. 2 is an enlarged sectional view of a flow control device, FIG. 3 is a diagram for explaining connection between a dry sprinkler facility and an accelerator, and FIG. 4 is a front view of a conventional accelerator. It is sectional drawing. 10 Accelerator body, 11 Opening of main body 12 Bellows, 13 Metal fitting, 15 Stem valve 17 Valve seat, 30 Flow regulator, 33 Hole 34 Nozzle, 36 …… Check packing 37 …… Conical body

Claims (2)

(57) [Claims] A main body having a valve mechanism divided into a primary side and a secondary side; a bellows for sealing an opening at an upper portion of a primary side of the main body; a valve seat of the valve mechanism attached to a central portion of the bellows via a metal fitting. A chamber that covers the upper opening of the body; a bypass that allows the air on the secondary side of the alarm valve to enter and exit the chamber; and a flow regulator that is installed in the bypass. An accelerator for dry sprinkler equipment, characterized in that: 2. The flow control device according to claim 1, wherein the flow control device comprises a nozzle having a hole on a side surface, a cone provided to be able to advance and retreat in the nozzle, and a check gasket mounted on the outer periphery of the nozzle. Accelerator for dry sprinkler equipment.