JP2016131655A - Valve for firefighting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve for firefighting equipment, the valve that can prevent abnormal boost of a fluid filled in a control chamber and facilitate recovery work after maintenance.SOLUTION: An inside of a hollow body 1 installed on firefighting equipment piping is partitioned to a primary side chamber 3 and a secondary side chamber 4 by a partition wall 2, and is provided with a valve body 7 mounted on a consecutive through-hole 6 formed to the partition wall 2. A control chamber 9 is formed on the surface opposite to the side opposed to the consecutive through-hole 6 of the valve body 7, and is capable of closing and opening the valve body 7 by water filling/drainage to the control chamber 9. A variable orifice part 14 is provided in a flow path 10 for bringing the primary side chamber 3 into communication with the control chamber 9. An orifice hole 15 is provided in one end side of the inner space of the variable orifice part 14. A valve 17 is installed in the inner space. A valve seat 16 is installed in the end at the side of the primary side chamber 3 of the inner space. A very small amount of water passing part is provided which enables the water passing of the amount less than the amount of water passing in the orifice hole 15 while the valve 17 is seated to the valve seat 16.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fire fighting equipment valve such as a running water detection device or a simultaneous opening valve installed in a fire fighting equipment pipe.

The valves installed in the fire extinguishing equipment piping have an action of opening and closing in the event of a fire, outputting an alarm, and supplying fire extinguishing water to the fire occurrence area. As an example of a fire extinguishing equipment valve, there is a pre-operated running water detection device described in Patent Document 1.

The pre-actuated flowing water detection device 50 shown in FIG. 5 is filled with water in the primary side chamber I in a control chamber 52 formed on the back surface of the valve body 51. The valve body 51 is pressed against the valve seat by the force of the spring 53. When the valve body is opened due to a fire, the valve body 51 is moved upward and opened by opening the motor-operated valve 54 connected to the control chamber 52 and allowing the water inside the control chamber 52 to flow out.

A check valve 55 is installed between the primary side chamber I and the control chamber 52 to prevent the water inside the control chamber 52 from flowing into the primary side chamber I.

However, the water inside the control chamber 52 expands due to high temperatures in the summer and the pressure becomes abnormally high, and the abnormal pressure increase may damage the lid 56 and the main body 57. In order to prevent this, it is conceivable that the check valve 55 is not installed. In such a case, if the water in the primary side chamber I is drained during maintenance, the water filled in the control chamber 52 will also escape. When the water is restored again after maintenance, the manual valve 58 must be opened to evacuate the air inside the control chamber 52, which requires time and effort for the restoration work.

JP 2010-57809 A

Therefore, in view of the above problems, an object of the present invention is to provide a fire extinguishing equipment valve that can prevent abnormal pressure increase of a fluid filled in a control chamber and can easily perform recovery work after maintenance.

In order to achieve the above object, the present invention provides the following fire extinguishing equipment valve.
That is, a hollow main body installed on the fire extinguishing equipment piping, a partition wall that divides the inside of the main body into a primary side chamber and a secondary side chamber, and the partition wall has a communication hole at a position formed substantially parallel to the central axis of the main body. In addition, a control chamber is formed on the valve element placed on the communication hole and on the surface opposite to the side of the valve element that faces the communication hole. The variable orifice portion is provided in the flow path that communicates between the primary side chamber and the control chamber, and has an orifice hole on one end side of the internal space of the variable orifice portion. A valve is installed at the end of the internal space on the side of the primary side chamber, and a smaller amount of water can flow through the orifice hole when the valve is seated on the valve seat. It has a small amount of water passage.

  According to the above, when the water in the primary side chamber is drained, the water in the control room is also slightly removed from the minute water passage portion. The surface tension of water acts on the water, making it difficult for water to flow out. This prevents water from remaining inside the control room and air from entering the control room. Furthermore, there is no need to remove air from the control room during the restoration work, water supply and pressurization to the control room are smoothly performed, and the operation time of the pump can be shortened.

With regard to the present invention, the minute water flow portion can be configured as a slit that communicates with the orifice hole from the vicinity of the valve seat installed at the end that communicates with the internal space of the orifice hole. Or it is also possible to make it the slit carved in the surface of the valve seat and the side to seat.

As described above, according to the present invention, it is possible to realize a fire extinguishing equipment valve that can prevent abnormal pressure increase of a fluid filled in a control chamber and can easily perform a recovery operation after maintenance.

Sectional drawing of the pre-operation type | formula flowing water detection apparatus which is a valve for fire extinguishing equipment of this invention. The expanded sectional view of a variable orifice part. The piping system figure of the fire extinguishing equipment in which the pre-operation type flowing water detection apparatus of FIG. 1 was installed. The expanded sectional view of the modification of a variable orifice part. Sectional drawing of the conventional pre-operation type | formula flowing water detection apparatus.

The fire extinguishing equipment valve shown in FIG. 1 is a pre-actuated running water detection device 100, the main body 1 is hollow, and the inside is partitioned into a primary side chamber 3 and a secondary side chamber 4 by a partition wall 2. As shown in FIG. 1, the partition wall 2 is bent inside the main body 1, and the partition wall 2 forms a primary side chamber 3 on the left side of the main body 1 and a secondary side chamber 4 on the right side. A communication hole 6 for communicating the primary side chamber 3 and the secondary side chamber 4 is formed in a plane 5 formed substantially parallel to the central axis of the main body 1.

In the drawing, the valve body 7 installed on the left side of the plane 5 has a bottomed cylindrical shape, and the communication hole 6 is closed by the bottom surface of the valve body 7. The outer peripheral surface of the valve body 7 is movable along the inner wall of the main body 1, and the communication hole 6 can be opened and closed by the movement of the valve body 7.

A control chamber 9 is formed between the valve body 7 and the lid 8 of the main body 1. A flow path 10 that leads to the primary side chamber 3 and a flow path 11 that leads to the outside are connected to the control chamber 9. Water filled in the primary side chamber 3 is supplied to the control chamber 9 by the flow path 10. A motor-operated valve 12 that can be remotely operated is installed in the flow path 11, and the motor-operated valve 12 is always closed. Therefore, the water supplied from the primary side chamber 3 to the control chamber 9 is filled in the control chamber 9, and the valve body 7 maintains the state where the communication hole 6 is closed.

The amount of water supplied from the flow path 10 to the control chamber 9 is smaller than the amount of water discharged from the control chamber when the motor-operated valve 12 is opened. Therefore, when the motor-operated valve 12 is opened, the water filled in the control chamber 9 is discharged to the outside from the flow path 11, the water pressure in the control chamber 9 is lowered, and the valve body 7 is separated from the communication hole 6. When the motor-operated valve 12 is returned to the closed state again, water supplied from the flow path 10 is filled into the control chamber 9, and the valve body 7 moves toward the communication hole 6 to close the communication hole 6.

The lid 8 is provided with a spindle 13 that passes through the lid 8 and is inserted into the control chamber 9. The spindle 13 is rod-shaped and has a male screw threaded on its side surface, and is screwed into a female screw formed in the through hole of the lid 8. The length of the insertion into the control chamber 9 can be adjusted by rotating the end of the spindle 13 that protrudes from the lid 8 with these screw structures.

In FIG. 1, a dotted line indicates that the end of the spindle 13 inserted into the control chamber 9 is in contact with the bottom of the valve body 7. This is a state in which the valve body 7 is locked in order to prevent the valve body 7 from opening during maintenance or water introduction. After maintenance or after water introduction, the end of the spindle 13 is away from the bottom of the valve body 7 as depicted by a solid line.

A variable orifice portion 14 is installed in the flow path 10. A space is formed in the variable orifice portion 14 shown in FIG. 2, and an orifice hole 15 capable of communicating with the primary side chamber 3 and the control chamber 9 is formed at the lower end side in the drawing. An end of the orifice hole 15 on the control chamber 9 side is a valve seat 16 formed in a slope shape, and a spherical valve 17 is seated. When the water pressure inside the primary side chamber 3 and the water pressure inside the control chamber 9 are equal, the valve 17 is seated on the valve seat 16 by its own weight. When the water pressure inside the primary side chamber 3 exceeds the water pressure inside the control chamber 9, the valve 17 moves away from the valve seat 16 and passes through the orifice hole 15 from the primary side chamber 3 to supply water to the control chamber 9.

A partition wall 18 having a plurality of holes is formed on the control chamber 9 side (upper side in the drawing) of the valve 17. Water that has passed through the orifice 15 from the primary side chamber 3 passes through a plurality of holes in the partition wall 18 and is supplied to the control chamber 9. The partition wall 18 restricts the movement range of the valve 17. It is also possible to install a compression spring between the partition wall 18 and the valve 17.

A slit 19 is engraved on the edge of the valve seat 16 as a minute water passage, and when the valve 17 is seated on the valve seat 16, water passes between the primary side chamber 3 and the control chamber 9 through the slit 19. Is possible. The water flow rate of the slit 19 is smaller than the water flow rate of the orifice hole 15 when the valve 17 is separated from the valve seat 16. As an example, when the inner diameter of the orifice hole 15 is 3 to 6 mm, the width and depth of the slit 19 are about 1 to 2 mm.

When the valve 17 is seated on the valve seat 16, the amount of water passing between the primary side chamber 3 and the control chamber 9 is extremely small, and when the valve 17 is away from the valve seat 16, the primary side chamber 3 is transferred to the control chamber 9. More water can be supplied.

Then, the operation | movement at the time of the fire of said pre-operated type | formula water detection apparatus 100 is demonstrated.
As shown in FIG. 3, the pipe connected to the primary side chamber 3 of the pre-actuated flowing water detection device 100 leads to the water source W, and a plurality of sprinkler heads SH are installed in the pipe connected to the secondary side chamber 4. . The communication hole 6 that connects the primary side chamber 3 and the secondary side chamber 4 is closed by a valve body 7, and the pressure of the water charged in the primary side chamber 3 in this state is the pressure of the water charged in the secondary side chamber 4. Is set higher than.

A fire detector K is installed in the vicinity of the sprinkler head SH, and the fire detector K is electrically connected to the control device C. The control device C and the motor operated valve 12 are also electrically connected.

When a fire occurs, the fire detector K is activated and the control device C receives an operation signal of the fire detector K. The control device C opens the motor-operated valve 12 by the operation of the fire detector K. Then, the water filled in the control chamber 9 is discharged to the outside. On the other hand, in the flow channel 10, water is supplied from the primary side chamber 3 to the control chamber 9, but the amount of drainage from the flow channel 11 is more than the amount of water supplied to the control chamber 9 by the variable orifice portion 14 provided in the flow channel 10. Since there are many, the pressure inside the control chamber 9 drops and the valve body 7 moves in the direction of the lid 8 so that the communication hole 6 can pass water.

When the sprinkler head SH is activated by the heat of the fire following the fire detector K, the water in the pipe is sprayed from the sprinkler head SH into the room, so that the pressure in the pipe is reduced. The pump P provided in the vicinity of the water source W is activated by pressure reduction in the pipe, and water is pumped from the water source W. Water is supplied to the sprinkler head SH that has been operated through a pipe and a running water detector, and water is continuously sprayed from the sprinkler head SH to extinguish the fire.

Next, a case where the inside of the control room is abnormally boosted at a high temperature in summer will be described.
During normal times, the valve body 7 closes the communication hole 6 and the control chamber 9 is filled with water. If the water filled in the control chamber 9 expands due to high temperatures in summer, the main body 1 and the lid 8 may be damaged by the pressure of the water. In this application, the control chamber 9 and the primary side chamber 3 are formed by the slit 19 of the variable orifice portion 14. Since the water in the control chamber 9 flows out to the primary side chamber 3, the pressure increase of the water in the control chamber 9 can be suppressed. Thereby, the main body 1 and the lid 8 can be prevented from being damaged due to abnormal pressure increase.

Next, the restoration work after maintenance will be described.
When replacing or cleaning the equipment between the water source W and the primary side chamber 3, the water in the pipe from the water source W to the primary side chamber 3 is discharged. At that time, in order to prevent the valve element 7 from opening, the spindle 13 abuts one end side against the bottom of the valve element 7 as shown by the dotted line in FIG. If the water in the primary side chamber 3 is drained, the water in the control chamber 9 may flow out to the primary side chamber 3 because the primary side chamber 3 and the control chamber 9 are communicated with each other by the pipe 10. The valve 17 is pressed against the valve seat 16 by the pressure of water in the control chamber 9, and the orifice hole 15 is closed.

However, since the slit 19 can pass water, a small amount of water flows out to the primary side chamber 3, but when the water pressure in the control chamber 9 drops to some extent, the momentum of the water disappears, and the opening extending to the orifice hole 15 of the slit 19 disappears. The surface tension of water acts to make it difficult for water to flow out. As a result, water remains in the control chamber 9 and air does not enter the control chamber 9.

After the maintenance work, the pump P is activated to send water from the water source W to the flowing water detection device 100.
Since there is almost no air inside the control chamber 9 and water remains, the pressure in the control chamber 9 is increased smoothly. The pressures in the primary chamber 3 and the control chamber 9 are confirmed by pressure gauges P1 and P3, and the pump P is stopped when the pressure reaches a predetermined value. Finally, the spindle 13 is rotated to return to the state shown by the solid line in FIG. This completes the maintenance work and the recovery work.

Modified example (FIG. 4)
FIG. 4 is a modification of the variable orifice portion. In addition, about the location where the structure same as the variable orifice part 14 demonstrated previously is attached | subjected, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted. 4 is different from the variable orifice 14 described above in the structure of the valve. The valve 31 shown in FIG. 4 has a disk shape, and a slit 34 is formed on a surface 33 of the valve 31 on the side where the valve 31 is seated.

The slit 34 is a minute water passage and continues to the outer peripheral surface of the valve 31. In a state where the valve 31 is seated on the valve seat 32, the primary side chamber 3 and the control chamber 9 can pass through the slit 34 and the orifice hole 15. The water flow rate of the slit 34 is smaller than the water flow rate of the orifice hole 15 when the valve 31 is opened. For example, when the inner diameter of the orifice hole 15 is 3 to 6 mm, the width of the slit 34 is about 0.5 to 2 mm. .

A cylindrical portion 35 is installed on the back surface of the valve 31, and the tip of the cylindrical portion 35 is inserted through a hole in the partition wall 18. The outer peripheral surface of the cylindrical portion 35 is guided by the inner peripheral surface of the hole, and the valve 31 can operate vertically with respect to the valve seat 32. A compression spring 36 is inserted into the cylindrical portion 35, and the compression spring 36 acts on the partition wall 18 and the back surface of the valve 31 to urge the valve 31 toward the valve seat 32.

The present invention can be applied not only to the pre-actuated flowing water detection apparatus described above but also to a simultaneous opening valve used in a foam fire extinguishing facility. Moreover, it is applicable also to general purpose valves other than fire extinguishing equipment.

100 Pre-acting running water detector
1 Body
2 Bulkhead
3 Primary side room
4 Secondary room
6 Communication hole
7 Disc
8 lid
9 Control room
10, 11 channel
12 Motorized valve
13 Spring
14 Variable orifice
15 Orifice hole
16, 32 Valve seat
17, 31 valves
19, 34 Slit

Claims (4)

A hollow body installed on the fire extinguishing equipment piping;
A partition partitioning the interior of the main body into a primary side chamber and a secondary side chamber;
The partition has a communication hole at a place formed substantially parallel to the central axis of the main body,
A valve body placed on the communication hole;
A control chamber is formed on the surface opposite to the side facing the communication hole of the valve body.
The valve body can be closed and opened by filling and draining the control room.
A variable orifice part is provided in a flow path that communicates the primary side chamber and the control chamber, and has an orifice hole on one end side of the internal space of the variable orifice part, and a valve is installed in the internal space, A valve seat is installed at the end of the internal space on the primary side chamber, and it has a minute water passage that allows water to flow less than the amount of water through the orifice hole when the valve is seated on the valve seat. Characteristic fire extinguishing equipment valve. 2. The fire extinguishing equipment valve according to claim 1, wherein the minute water flow portion is a slit that leads to the orifice hole from the vicinity of the valve seat installed at the end on the side communicating with the internal space of the orifice hole. 2. The fire extinguishing equipment valve according to claim 1, wherein the minute water flow portion is a slit formed on a surface of the valve seat and a side to be seated. The said valve body is a valve for fire extinguishing equipment in any one of Claims 1-3 installed in the inside of a primary side chamber.

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