JP3263874B2 - Refill safety valve and pressure regulator for fire extinguishing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulator for use in a wet fire extinguishing system such as a wet sprinkler extinguishing system.

[0002]

2. Description of the Related Art Conventionally, it has been known that an automatic alarm valve and a pressure regulating valve are used in a pipe of a fire extinguishing system. For example, in the case of a sprinkler fire extinguishing system, a wet automatic alarm valve is provided in the pipe, and the primary water pressure of the primary side is maintained by a pressure air tank, and the secondary water pressure is set to be the same as the primary side so that the primary water pressure is the same as the primary side. Is adjusted by a small spherical check valve provided on the For example, if water leaks from a closed sprinkler head or a pipe joint at the time of warning, the water pressure on the secondary side decreases, but is the same as that on the primary side due to the function of the check valve. Regarding the increase in the water pressure on the secondary side due to the rise, the check valve sometimes remains abnormally high because the check valve remains closed due to the water pressure. When the primary and secondary water pressures are the same, the main valve is closed because, in addition to its own weight, the secondary pressure receiving area of the valve seat is larger than the primary pressure receiving area. On the other hand, when the sprinkler head is released to start water discharge due to a fire or the like, the water pressure on the secondary side drops rapidly, so that the main valve is pushed up by the water pressure on the primary side to open and is formed on the seat ring of the valve seat. Since the water pressure is also applied to the pressure signal water hole, the pressure switch detects the pressure and notifies the fire receiving panel of the water discharge.
At this time, the pressure switch provided on the pressure air tank
Detects a drop in water pressure on the next side and starts the fire pump.

[0003]

However, when the conventional equipment is installed in a high-rise building or the like, the water spray from the sprinkler head has a high pressure (the lower the level, the higher the pressure). At the same time, a large amount of fire extinguishing water was sprinkled, causing severe damage from water damage. Further, a safety valve must be provided in the secondary side piping even when the secondary side is abnormally pressurized due to a temperature rise. In this case, there is a problem that an extra space is required on the pipe, and the equipment cost is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and maintains the secondary pressure at a predetermined value irrespective of the primary pressure or the amount of water discharged from the secondary side. It is an object of the present invention to obtain a pressure regulating device for a fire extinguishing system and a supplementary safety valve having a pressure regulating function such that watering is performed at an optimum pressure.

[0005]

A refill safety valve according to the present invention comprises a first chamber into which low-pressure fluid flows, a second chamber into which high-pressure fluid flows, and a third chamber into which the low-pressure fluid flows. A chamber, a chamber for discharging the fluid in the third chamber to the outside, which is always closed with the third chamber, and a low-pressure fluid in the first chamber that has flowed in When the pressure falls below the set first pressure value, the first and second chambers communicate with each other to replenish the high-pressure fluid through the first and second chambers, and the low-pressure fluid in the first chamber is set in advance. And a pressure regulator for communicating the third and fourth chambers and discharging the low-pressure fluid to the outside via the third and fourth chambers when the pressure exceeds the second pressure value. .

Further, the pressure regulating device for fire extinguishing equipment according to the present invention has a valve body in the center, a primary pipe filled with a high-pressure fluid on the primary side, and a secondary pipe filled with a low-pressure fluid on the secondary side. Respectively connected to the secondary pipes, to maintain the fluid pressure in the secondary pipes,
A valve body that opens the valve body when the fluid in the secondary pipe is released, a first chamber connected to a secondary side of the valve body, and a first chamber connected to a primary side of the valve body. A second chamber, a third chamber into which the fluid on the secondary side flows, and a chamber for discharging the fluid in the third chamber to the outside, which is always closed with the third chamber. When the low-pressure fluid in the first chamber portion flowing from the four chamber portion and the secondary side of the valve body portion falls below a first pressure value set in advance, the first and second chamber portions communicate with each other. The high-pressure fluid on the primary side of the valve body is replenished to the secondary side thereof through the first and second chambers, and the low-pressure fluid in the first chamber exceeds a second pressure value set in advance. And a pressure regulator for communicating the third and fourth chambers and discharging the low-pressure fluid on the secondary side of the valve body to the outside via the third and fourth chambers. It is obtained by a valve.

Further, the pressure regulating device for fire extinguishing equipment according to the present invention has a valve body in the center, a primary pipe filled with high-pressure fluid on the primary side, and a secondary pipe filled with low-pressure fluid on the secondary side. A valve body connected to the next pipe, a valve body driving unit having a motor provided on the valve body and connected to the valve body via a speed reducing means for reducing a rotation speed; and the valve body. A pressure chamber into which the fluid of the secondary side flows, and when the pressure in the pressure chamber is equal to or less than a predetermined lower limit, the motor of the valve body driving unit is rotated in one direction to open the valve body. Let
When the pressure in the pressure chamber is equal to or higher than a preset upper limit value, a pressure detection unit that rotates the motor in the other direction to close the valve body, and a first detection unit connected to a secondary side of the valve body unit. A chamber, a second chamber connected to the primary side of the valve body,
A third chamber connected to a secondary side of the valve body,
A fourth chamber which is a chamber for discharging the fluid in the chamber to the outside and which is always closed with the third chamber, and a low-pressure fluid in the first chamber which flows in from the secondary side of the valve body. When the pressure falls below a first pressure value set in advance, the first and second chambers are communicated with each other and the high-pressure fluid on the primary side of the valve main body is discharged through the first and second chambers. When the low pressure fluid in the first chamber exceeds a predetermined second pressure value, the low pressure fluid in the first chamber communicates with the third and fourth chambers, and the low pressure in the secondary of the valve body is reduced. A replenishing safety valve provided with a pressure regulator for discharging the fluid to the outside via the third and fourth chambers.

[0008]

In the replenishment safety valve of the present invention, when the low-pressure fluid flowing into the first chamber falls below a first pressure value set in advance, the pressure adjusting section operates the first and second chambers. , The high-pressure fluid on the high-pressure side flows to the low-pressure side via the first and second chambers to increase the fluid pressure. When the fluid pressure on the low pressure side reaches the first pressure value, the pressure adjusting unit
The communication between the first and second chambers is closed to block the flow of the high-pressure fluid into the first chamber. On the other hand, when the low-pressure fluid in the first chamber exceeds the second pressure value, the low-pressure fluid is discharged to the outside through the third and fourth chambers by communicating with the third and fourth chambers. . In this case, since the fluid pressure on the low pressure side decreases, when the fluid pressure decreases to the second pressure value, the pressure regulating unit closes the communication between the third and fourth chambers and causes the outflow of the low pressure fluid. To prevent

In the pressure regulating device for a fire extinguishing system according to the present invention, a supplementary safety valve is mounted on a valve body for holding a low-pressure fluid in a secondary pipe, and a valve body is provided in a first chamber of the supplementary safety valve. The low-pressure fluid on the secondary side of the section flows in, and the high-pressure fluid on the primary side flows in the second chamber. In this state, when the low-pressure fluid on the secondary side falls below a first pressure value set in advance, the pressure regulator communicates the first and second chambers. At this time, the high-pressure fluid on the primary side of the valve body
And flows to the secondary side of the valve body through the second chamber.
Increase the fluid pressure on the downstream side. When the low pressure fluid in the secondary pipe reaches the first pressure value by this replenishment, the pressure adjusting unit
The communication between the first and second chambers is closed to prevent the high-pressure fluid from flowing into the second chamber. On the other hand, when the low-pressure fluid in the first chamber exceeds the second pressure value, the pressure regulator communicates with the third and fourth chambers to remove the low-pressure fluid on the secondary side of the valve body. It is discharged to the outside through the third and fourth chambers. Due to this discharge, the fluid pressure in the secondary pipe decreases to reach the second pressure value, so that the communication between the third and fourth chambers is closed as described above.

Further, in the pressure regulating device for fire extinguishing equipment according to the present invention, the motor is stopped when the fluid pressure on the secondary side of the valve body is between the lower limit value and the upper limit value. When the fluid pressure in the first chamber of the replenishment safety valve is between the first and second pressure values set in advance, the pressure regulator is connected to the first and second chambers and the third and third pressures. The communication of the four rooms is closed. The pressure value is set to be equal to or slightly higher than the lower limit value and the upper limit value, and can be adjusted with respect to a slight change in the fluid pressure on the secondary side of the valve main body during caution. When the fluid pressure rises or falls based on this pressure value, the supplementary safety valve operates as described above, and the fluid pressure on the secondary side is maintained at that value. When the fluid pressure is equal to or lower than the lower limit, the pressure detector detects the lower limit and rotates the motor so that the valve body rotates in the opening direction. Conversely, when the fluid pressure is equal to or higher than the upper limit, The pressure detector reversely rotates the motor so that the valve element rotates in the closing direction. In this way, the replenishment safety valve adjusts for slight changes in fluid pressure due to leakage or temperature rise during warning,
The pressure detector controls the valve element when a large change in fluid pressure occurs due to operation of the sprinkler head or test drainage.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram of a pressure regulating wet type automatic alarm valve showing one embodiment of the present invention, FIG. 2 is an external view of a pressure regulating wet type automatic alarm valve, FIG. 3 is a configuration diagram of a pressure switch, and FIG. FIG. 5 is a circuit diagram for explaining the operation of the pressure regulating wet type automatic alarm valve.

In FIG. 1, reference numeral 10 denotes a ball valve main body having, for example, a spherical valve element (not shown), a primary pipe filled with high-pressure water is connected to the primary side, and a secondary pipe is connected to the secondary side. A secondary pipe filled with low-pressure water is connected. Reference numeral 20 denotes a valve drive unit provided in the ball valve main body 10, and a DC motor 21 and a DC motor 2 for rotating the valve as shown in FIG.
1 is provided with a gear 22 for slowing down the rotation, limit switches 23, 24 and 25 for detecting opening and closing of the valve body, and projections 26, 27 and 28 provided on a rotating shaft 29 connected to the valve body. The limit switch 23 is for detecting the full opening of the valve body, and the projection 26 comes into contact with the contact when the valve body is fully opened. In addition, the limit switch 24
Is for detecting the full closing of the valve body, and the projection 27 comes into contact with the contact point when the valve body is closed. Further, the limit switch 25 detects when the valve body is slightly opened, and the projection 28 comes into contact with a contact point. When the limit switch 25 detects this, a fire reception board (not shown) is displayed to that effect.

Reference numeral 30 denotes a remote test valve mounted on the secondary side of the ball valve body 10, which is opened and closed by remote control.
When the valve opens, the pressure water on the secondary side of the ball valve body 10 is drained. This is to test whether or not the pressure-adjustment type automatic alarm valve (hereinafter, referred to as “alarm valve”) operates normally. 40 is a drain valve, 50 is a ball valve body 1
As shown in FIG. 3, a two-contact type pressure switch (hereinafter, referred to as a "pressure switch") for detecting the water pressure on the secondary side of 0
Microswitches 51, 5 arranged opposite to each other
2. A pressure chamber 53 communicating with the secondary side of the ball valve body 10, a bellows 54 (expandable partition) that expands and contracts in the vertical direction according to the water pressure in the pressure chamber 53, and a micro switch 51 according to the amount of expansion and contraction of the bellows 54. , 52 operating rods 55,
And it consists of a spring 56 and the like.

The micro switch 51 (hereinafter referred to as "PS-
L ") is for detecting the lower limit of the water pressure on the secondary side. For example, when the water pressure in the pressure chamber 53 is 2.2 kg / cm ²
When the water pressure is 2.0 kg / cm ² (lower limit) or lower, the contact returns because the rod 55 descends and separates.
When this is described in terms of a circuit, as shown in FIG. 5, when pressed by the rod 55, the contact is connected to the b side,
When the rod 55 separates, the contact returns and switches to the a side. The micro switch 52 (hereinafter, referred to as PS-H) is for detecting the upper limit of the water pressure. For example, when the water pressure in the pressure chamber 53 is 2.5 kg / cm ² or more, the contact is pressed by the rod 55. . In this case, referring to the circuit diagram of FIG. 5, when the water pressure is less than 2.5 kg / cm ² , the contacts are connected to the a side, but when pressed by the rod 55, the contacts are moved to the b side. Switch.

Reference numeral 60 denotes a refill safety valve mounted on the ball valve main body 10, as shown in FIG. 4, a first chamber 61 into which pressure water on the secondary side of the ball valve main body 10 flows, and a pressure on the primary side. The second chamber 62 into which water flows in, the third chamber 63 into which pressure water on the secondary side flows in, the fourth chamber 64 which drains the pressure water in the third chamber 63, and the water pressure in the first chamber 61 , A piston 65 that expands and contracts a spring 67 in accordance with the above, a stem 66 that is detachably fixed to the piston 65, and upper and lower O-rings 68 and 69 that are provided so as to contact the outer periphery of the stem 66.
In addition, a pressure adjusting bolt 71 in contact with the spring receiver 70 is provided at an upper portion, and a pressure adjusting bottom cap 72 is provided at a lower portion. The bolt 71 is for adjusting the first pressure value to, for example, 2.2 kg / cm ² , and the bottom cap 72 is for adjusting the second pressure value to, for example, 3.0 kg / cm ^2.
kg / cm ² to adjust the ball valve body 1
Set a value different from the secondary water pressure. Reference numeral 80 denotes a diode (see FIG. 5).

The operation of the alarm valve configured as described above will be described with reference to FIG. PS-L51 and PS in this figure
The connection state of -H52 indicates when the water pressure on the secondary side of the ball valve main body 10 is within a predetermined range (a lower limit value of 2.0K to an upper limit value of 2.5K), and is provided in the valve body driving unit 20. The connection states of the limit switches 23, 24, and 25 indicate when the valve body of the ball valve body 10 is fully closed. When the water pressure on the secondary side of the ball valve main body 10 falls below the first pressure value due to water leakage or the like during warning, the water pressure in the first chamber 61 of the replenishment safety valve 60 also decreases accordingly. Extends downward to push down the piston 65 and the stem 66. When the water pressure in the first chamber 61 reaches the first pressure value, a gap is formed between the stem 66 and the upper O-ring 68, and the first pressure is reduced.
And the flow paths of the second chambers 61 and 62 are communicated with each other, so that the pressure water (high pressure) on the primary side of the ball valve body 10 is second and first.
It flows to the secondary side through the chambers 62 and 61, and raises the water pressure in the secondary pipe. At this time, the piston 65 rises as the water pressure rises and pushes up the spring 67. And 2
When the water pressure in the next pipe reaches a predetermined value, the flow paths of the first and second chambers 61 and 62 are closed by the stem 66.

On the other hand, when the water pressure on the secondary side exceeds the second pressure value due to a rise in temperature or the like, the water pressure in the first chamber 61 of the replenishment safety valve 60 also increases accordingly. 67 is pushed up, and the piston 65 and the stem 66 are pulled up. When the water pressure in the first chamber 61 reaches the second pressure value, in this case, the stem 66 and the lower O-ring 6
9 and the flow path of the third and fourth chambers 63 and 64 is opened, so that the pressure water (low pressure) on the secondary side of the ball valve main body 10 is released from the third and fourth chambers. Drained to the outside via 63 and 64, the water pressure in the secondary pipe is lowered. Then, when the water pressure reaches the second pressure value, the spring 67 pushes down the piston 65 and the stem 66 to close the flow passages of the third and fourth chambers 63 and 64.

When the water pressure on the secondary side of the ball valve main body 10 drops sharply due to the operation of the sprinkler head or the like and becomes lower than the lower limit value, the replenishment safety valve 60 increases the high pressure to the secondary side as described above. Supply water. In this case, since the bellows 54 and the rod 55 of the pressure switch 50 move down and the rod 55 separates from the contact point of the PS-L 51, the contact point is switched from b to a and the DC
The motor 21 is connected to a power supply (24 VDC). At this time, the DC motor 21 rotates forward to rotate the ball valve main body 10.
Is rotated in the opening direction to supply the primary side pressure water to the secondary side. At this time, by the rotation of the rotating shaft 29, the limit switch 24 is switched from a to the b side, and the projection 28 presses the limit switch 25 to change its contact point to b.
Side, the fire receiver will display that the valve has been activated. When the water pressure on the secondary side increases due to the opening of the valve body, the water pressure in the pressure chamber 53 increases in accordance with the pressure increase,
The rod 55 is pushed up together with the bellows 54. And
When the water pressure reaches 2.2 kg / cm ² , the rod 55 presses the contact point of the PS-L 51 and switches to the b side.
The rotation of the C motor 21 is stopped. Then, when the water pressure on the secondary side further reaches the upper limit of 2.5 kg / cm ² , the rod 55 presses the contact point of the PS-H 52 by the water pressure to switch to the b side, and connects the DC motor 21 and the power supply. Connecting. In this case, the DC motor 21 rotates in the reverse direction to rotate the valve body in the reverse direction to narrow the flow path, reduce the supply to the secondary side, and reduce the secondary side pressure. 3kg / c
When it reaches m ² , the contact of the PS-H 52 is switched to “a” to stop the rotation of the DC motor 21. Further, the secondary pressure is set to an upper limit (2.5 kg / cm ² ) and a lower limit (2.0 k / cm ² ).
g / cm ² ), the rotation of the DC motor 21 stops. In this way, the secondary pressure is kept at a predetermined value.

In the above embodiment, the case where the ball valve body 10 is used as the valve body is described. However, a valve body of another shape such as a ball valve may be used. Further, the first pressure value and the second pressure value of the replenishment safety valve, and the lower limit value and the upper limit value of the pressure detector may be different values from the above, and the first pressure value and the lower limit value, or the second pressure value may be different. The value and the upper limit may be the same value.

[0020]

As described above, according to the present invention, the supplementary safety valve for maintaining the secondary-side water pressure at a predetermined pressure value is integrated with the valve body, so that the conventional safety valve after the alarm valve is required. Since the pressure regulating valve and the safety valve are not required, the construction is simplified, and the construction is simplified and the equipment cost is reduced as compared with the conventional one. Further, since the water pressure on the secondary side is maintained at a predetermined value, a resin pipe having a low working pressure or a low pressure resistance can be used as the secondary pipe.

[Brief description of the drawings]

FIG. 1 is a system diagram of a pressure regulating wet type automatic alarm valve showing one embodiment of the present invention.

FIG. 2 is an external view of a pressure-adjustment automatic alarm valve.

FIG. 3 is a configuration diagram of a pressure switch.

FIG. 4 is a configuration diagram of a supplementary safety valve.

FIG. 5 is a circuit diagram for explaining the operation of a pressure-adjustment type automatic alarm valve.

[Explanation of symbols]

 Reference Signs List 10 Ball valve body 20 Valve drive unit 30 Remote test valve 50 Pressure switch 60 Refill safety valve

Claims (4)

(57) [Claims] A first chamber into which a low-pressure fluid flows; a second chamber into which a high-pressure fluid flows; a third chamber into which the low-pressure fluid flows; and a fluid inside the third chamber. A fourth chamber, which is a chamber for discharging to the outside and is normally closed with the third chamber, and when the low-pressure fluid flowing into the first chamber falls below a first pressure value set in advance. The high-pressure fluid is replenished through the first and second chambers by communicating the first and second chambers, and when the low-pressure fluid in the first chamber exceeds a second pressure value set in advance. A replenishing safety valve, comprising: a pressure regulator that communicates the third and fourth chambers and discharges low-pressure fluid to the outside through the third and fourth chambers. 2. A valve having a valve body at a central portion, a primary side filled with a high-pressure fluid on a primary side, and a secondary side filled with a low-pressure fluid on a secondary side.
A valve body that is connected to a secondary pipe, holds a fluid pressure in the secondary pipe, and opens the valve body when the fluid in the secondary pipe is released; A connected first chamber, a second chamber connected to the primary side of the valve body, a third chamber into which the secondary fluid flows, and discharges the fluid in the third chamber to the outside. And a fourth chamber that is normally closed with the third chamber, and a first pressure chamber in which the low-pressure fluid in the first chamber that flows in from the secondary side of the valve body is preset. When the pressure value falls below, the first and second chambers communicate with each other to replenish the high pressure fluid on the primary side of the valve body to the secondary side via the first and second chambers, When the low-pressure fluid in the first chamber exceeds a preset second pressure value, the low-pressure fluid on the secondary side of the valve body is communicated with the third and fourth chambers through the third chamber. And a replenishment safety valve provided with a pressure regulator for discharging to the outside via the fourth chamber. 3. A valve having a valve body at the center, a primary side filled with a high-pressure fluid on the primary side, and a secondary side filled with a low-pressure fluid on the secondary side.
A valve body connected to the next pipe, a valve body driving unit having a motor provided on the valve body and connected to the valve body via a speed reducing means for reducing a rotation speed; and the valve body. A pressure chamber into which the fluid on the secondary side of
When the pressure of the pressure chamber is equal to or less than a predetermined lower limit, the motor of the valve driving unit is rotated in one direction to open the valve, and the pressure of the pressure chamber is equal to or more than a predetermined upper limit. A pressure detector for rotating the motor in the other direction to close the valve body, a first chamber connected to a secondary side of the valve body, and a primary chamber connected to a primary side of the valve body. Of the second chamber, 2 of the valve body
A third chamber connected to the next side, a chamber for discharging fluid in the third chamber to the outside, which is always closed with the third chamber, and the valve body; When the low-pressure fluid in the first chamber that flows in from the secondary side of the valve drops below a first pressure value set in advance, the first and second chambers are communicated with each other, and the high pressure on the primary side of the valve body is high. Fluid is replenished to the secondary side through the first and second chambers, and when the low-pressure fluid in the first chamber exceeds a preset second pressure value, the third and fourth chambers And a replenishment safety valve provided with a pressure regulator for discharging the low-pressure fluid on the secondary side of the valve body to the outside via the third and fourth chambers. Pressure regulator. 4. The pressure adjusting device for fire extinguishing equipment according to claim 2, wherein the secondary pipe is made of resin.