JP3254592B2 - Fire suppression equipment pressure regulator - 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 regulating device used for 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, a pressure regulating valve, and the like are used in a pipe of a fire extinguishing system.
For example, when a wet automatic alarm valve (hereinafter, referred to as an "alarm valve") is provided in a pipe of a sprinkler facility, the water pressure on the primary side is maintained by a pressurized air tank, and the water pressure on the secondary side is the same as the primary side. It is adjusted by a small spherical check valve provided on the main valve of the alarm valve. For example, even if the water pressure on the secondary side decreases due to water leakage from a closed sprinkler head or a pipe joint during warning, the water pressure on the secondary side is maintained because the check valve operates. 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 due to a fire or the like and starts to discharge water, the water pressure on the secondary side drops rapidly and becomes lower than a predetermined pressure, so the main valve is pushed up by the water pressure on the primary side to open, and the valve is opened. Since the water pressure is also applied to the pressure signal water hole formed in the seat ring of the seat, the pressure switch detects this and notifies the fire receiving panel of the water discharge. At this time, the pressure switch provided on the side of the pressurized air tank also detects the decrease in the water pressure on the primary side and starts the fire pump.

[0003]

However, in the conventional equipment, since abnormal pressure rise on the secondary side due to temperature rise must be taken into consideration, a safety valve must be provided after the alarm valve. In some cases, the water pressure on the secondary side is high, in which case a pressure regulating valve must be provided after the alarm valve, requiring extra space on the piping, Was hanging.
In addition, when the sprinkler head is opened for any reason, the water pressure on the secondary side drops rapidly as described above, and there is a problem that the alarm valve and the pressure control valve are activated to flood the room. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to prevent an abnormal pressure increase on the secondary side by increasing or decreasing the number of parts without separately providing a safety valve or a pressure regulating valve on a pipe. It is an object of the present invention to obtain a pressure regulating device for a fire extinguishing system that can maintain the secondary pressure and prevent water sprinkling due to malfunction.

[0005]

A pressure adjusting device for a fire extinguishing system according to the present invention includes a valve main body having a valve body at a central portion, and a speed reducing means provided on the valve main body for reducing a rotational speed. A valve body driving unit having a motor connected to the valve body, and a pressure chamber into which fluid on the secondary side of the valve body flows, and the pressure of the pressure chamber is equal to or less than a predetermined lower limit value. When the motor of the valve body driving unit is rotated in one direction to rotate the valve body in the opening direction, and when the pressure in the pressure chamber is equal to or higher than a predetermined upper limit, the motor is rotated in the other direction. And a pressure detector for rotating the valve body in the closing direction.

[0006] Also, a valve element detecting section provided in the valve element driving section, wherein the pressure detecting section detects the operation of the valve element when the motor is rotated in one direction, and is provided in the valve body section. The first and second pressure values are set in advance, and when the fluid pressure on the secondary side of the valve body falls below the first pressure value, the fluid pressure on the primary side of the valve body is reduced to the secondary side. And replenish
When the fluid pressure on the secondary side exceeds a second pressure value, a supplementary safety valve for discharging the secondary-side pressure fluid to the outside is provided.

Further, there is provided an opening / closing means which is provided between the pressure detecting section and a power supply and which is turned on when the fire detector detects a fire.

[0008]

In the present invention, when the pressure detecting section detects that the fluid pressure on the secondary side is lower than the lower limit value, the motor of the valve body driving section provided in the valve body section is rotated in one direction, and the valve body section is rotated. When the fluid pressure on the secondary side exceeds the upper limit value, the motor of the valve drive unit is rotated in the other direction to rotate the valve in the closing direction. Let it. In this way, the fluid pressure on the secondary side is maintained at a predetermined value.

In the present invention, a valve element detecting section for detecting the operation of the valve element is provided in the valve element driving section, and a replenishment safety valve is provided in the valve body section so as to be used as an automatic alarm valve. When the fluid pressure on the secondary side of the valve body falls below the first pressure value due to water leakage or the like,
The fluid pressure on the primary side of the valve body is replenished to the secondary side, and when the fluid pressure on the secondary side exceeds the second pressure value, the secondary side fluid is discharged to the outside. On the other hand, when the fluid pressure on the secondary side drops sharply due to the operation of the sprinkler head or the like and falls below the lower limit value, the pressure detection unit rotates the motor of the valve body driving unit in one direction to release the valve. The valve element of the main body is rotated in the opening direction, and when the fluid pressure on the secondary side exceeds the upper limit, the motor of the valve element driving section is rotated in the other direction to rotate the valve element in the closing direction. Move. When the valve element is rotated in the opening direction, the valve element detection unit detects the operation of the valve element and notifies the fire receiving panel of the operation. In this way, the replenishment safety valve adjusts for slight changes in fluid pressure due to water leakage, etc., and the pressure detection unit controls the valve body for large changes in fluid pressure due to operation of the sprinkler head, etc. Has become.

Further, the present invention is such that an opening / closing means is added to the above-mentioned automatic alarm valve so that it can be used as a pre-actuated automatic alarm valve. This opening / closing means is provided between a pressure detecting section and a power supply. Have been. At the time of caution, since the opening / closing means is in the off state, even if the sprinkler head operates erroneously, the pre-actuated automatic alarm valve does not operate. On the other hand, when the fire detector in the same fire compartment is activated, the opening / closing means is turned on in conjunction therewith, so that when the sprinkler head starts watering, the pressure detection unit provided on the secondary side of the valve body is not activated. Is detected and the valve is opened. At this time, the valve element detecting unit detects the operation of the valve element and notifies the fire receiving panel of the operation.

[0011]

1 is a system diagram of a pressure regulating valve showing one embodiment of the present invention, FIG. 2 is a circuit diagram for explaining the operation of the pressure regulating valve, FIG. 3 is an external view of the pressure regulating valve, and FIG. FIG. 3 is a configuration diagram of a pressure switch.

In FIG. 1, reference numeral 10 denotes a ball valve body provided with, for example, a spherical valve element (not shown). A primary pipe is connected to a primary pipe filled with high-pressure water, and a secondary pipe is connected to a secondary pipe. Is connected to a secondary pipe filled with low-pressure water. In addition, although the ball valve main body 10 has been illustrated as the valve main body, another type of valve main body such as a globe valve may be used. Reference numeral 20 denotes a valve element driving unit provided in the ball valve body 10, a DC motor 21 for rotating the valve element as shown in FIG. 3, limit switches 22 and 23 for detecting full opening and full closing of the valve element, and DC.
Projections 26, 27 provided on a rotation shaft 29 connected to a gear 25 and a valve body for slowing down the rotation of the motor 21,
28.

The limit switch 22 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. Further, the limit switch 23 is for detecting the full closing of the valve body, and the projection 27 comes into contact with the contact when the valve body is closed. The protrusion 28 is for detecting when the valve element is slightly opened. The circuit of the valve body drive unit 20 is as shown in FIG. This connection state is when the valve body is fully closed, and when the valve body is opened, the projection 27 is separated.
The contact No. 3 is switched from a to b side, and when the valve body is fully opened, the contact of the limit switch 22 is switched from b to a side by the protrusion 26. Reference numeral 60 shown in this figure is a diode.

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 the pressure regulating valve operates properly. 40 is a drain valve, 50
Is a two-contact type pressure switch (hereinafter, referred to as a "pressure switch") for detecting the water pressure on the secondary side of the ball valve body 10, and corresponds to the pressure detection unit of the present invention.

As shown in FIG. 4, the pressure switch 50 includes micro switches 51,
52, 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 rod 5 that operates the micro switches 51 and 52 according to the amount of expansion and contraction of the bellows 54.
5, and a spring 56 which expands and contracts in the vertical direction in accordance with expansion and contraction of the bellows 54.

The microswitch 51 (hereinafter, "PS-
L ") is for detecting the lower limit of the water pressure on the secondary side, and the water pressure in the pressure chamber 53 is, for example, 2.2 kg / cm ^2.
Is reached, the contact is pressed by the rod 55, and when the water pressure is, for example, 2.0 kg / cm ² (lower limit) or less, the rod 55 descends and separates, so that the contact returns. If this is described in terms of a circuit, as shown in FIG.
When pressed by the rod 55, the contact is connected to the b side, and when the rod 55 is separated, the contact returns to a
Switch to the side. The micro switch 52 (hereinafter, PS-
H)) to detect the upper limit of water pressure.
When the water pressure in the pressure chamber 53 is, for example, 2.5 kg / cm ² (upper limit) or more, the contact is pressed by the rod 55, and when the water pressure is lower than, for example, 2.3 kg / cm ² , the contact is restored. . This will be described with reference to the circuit diagram of FIG. 2. When the water pressure is less than 2.5 kg / cm ² , the contact a
The contact point is switched to the side b when pressed by the rod 55.

The operation of the pressure regulating valve configured as described above will be described with reference to FIG. The connection state of PS-L51 and PS-H52 in this figure is such that the water pressure of the secondary pipe of the ball valve body 10 is within a predetermined range (2.0 kg / cm ^{2 to} 2.5 k).
g / cm ² ), and as described above, the connection state of the limit switches 22 and 23 indicates that the valve body of the ball valve body 10 is fully closed. When the sprinkler head operates, the water pressure in the secondary pipe decreases, so the water pressure in the pressure chamber 53 formed in the pressure switch 50 also decreases,
Accordingly, the bellows 54 and the rod 55 descend.
When the water pressure drops to the lower limit of 2.0 kg / cm ² , the rod 55 separates from the PS-L51, so that the contact of the PS-L51 returns from b to a side, and the DC motor 21 and the power supply (24 VDC) And connect. in this case,
The DC motor 21 rotates forward to rotate the valve body of the ball valve body 10 in the opening direction, and supplies the primary-side pressurized water to the secondary side. At this time, the contact of the limit switch 23 returns to b by opening the valve body. When the water pressure in the secondary pipe rises due to the supply of the pressure water on the primary side, the water pressure in the pressure chamber 53 rises in accordance with the pressure increase, and pushes up the rod 55 together with the bellows 54. Then, when the water pressure reaches 2.2 kg / cm ² , the rod 55 presses the PS-L 51 to switch its contact to the b side to cut off the circuit between the DC motor 21 and the power supply, and to close the valve body. Stop in the open state.

When the water pressure in the pressure chamber 53 further increases and reaches the upper limit of 2.5 kg / cm ² , the rod 55
Presses the PS-H 52 by the water pressure, switches its contact to b, and connects the DC motor 21 and the power supply. In this case, the DC motor 21 rotates in the reverse direction to close the valve body to narrow the flow path to the secondary pipe. At this time, since the water pressure in the pressure chamber 53 formed in the pressure switch 50 also decreases, the rod 55 of the pressure switch 50 lowers in accordance with the decrease in the water pressure. And the water pressure is 2.3
When the pressure drops to kg / cm ² , the PS-H52 switches the contact to b
To return to the a side to cut off the current and stop the rotation of the DC motor 21. When the water pressure on the secondary side is between the upper limit value and the lower limit value, the rotation of the DC motor 21 stops. In this way, the water pressure on the secondary side is kept at a predetermined value.

Next, the case where the pressure regulating valve is used as an automatic alarm valve will be described. 5 is a system diagram of the automatic alarm valve, FIG. 6 is a circuit diagram for explaining the operation, FIG. 7 is an external view of the automatic alarm valve, and FIG. 8 is a configuration diagram of the supplementary safety valve.
The same or corresponding portions as those described in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof is omitted.

The automatic alarm valve of this embodiment is constructed by adding a limit switch 24 of a pressure detecting section and a supplementary safety valve 70 to the above-mentioned pressure regulating valve. Limit switch 24
Is for detecting a slight opening of the valve body, and is attached adjacent to a limit switch 22 provided in the valve body drive unit 20 as shown in FIG. It is activated by the protrusion 28. When the limit switch 24 is actuated, a message is displayed on a fire receiving panel (not shown).

The replenishment safety valve 70 is mounted at the center of the ball valve main body 10 as shown in FIG. 7, and detects a change in the water pressure in the secondary pipe and operates so as to keep the water pressure constant. As shown in FIG.
The first chamber 71 into which the next-side pressure water flows, the second chamber 72 into which the primary-side pressure water flows, the third chamber 73 into which the secondary-side pressure water flows, and the third chamber 73 The fourth chamber 74 that drains the pressurized water, the piston 75 that expands and contracts the spring 77 according to the water pressure in the first chamber 71, the stem 76 that is detachably fixed to the piston 75, and the outer periphery of the stem 76. Are provided with upper and lower O-rings 78 and 79 provided on the upper and lower sides. A pressure adjusting bolt 81 abutting on a spring receiver 80 is provided at an upper portion, and a pressure adjusting bottom cap 8 is provided at a lower portion.
2 are provided. The bolt 81 is for adjusting the first pressure value to, for example, 2.2 kg / cm ² , and the bottom cap 82 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
The upper and lower sides of 0 are set to values different from the lower limit.

The operation of the automatic alarm valve configured as described above will be described with reference to FIG. The connection state of PS-L51 and PS-H52 in this figure is such that the water pressure on the secondary side of the ball valve body 10 is within a predetermined range (lower limit 2.0 kg / cm ² to upper limit 2.5 kg / cm ² ). A limit switch 22, 23, 2 provided in the valve drive unit 20.
The connection state 4 indicates a state where 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 71 of the supplementary safety valve 70 also decreases accordingly. Extends downward to push down the piston 75 and the stem 76. At this time, a gap is formed between the stem 76 and the upper O-ring 78, and the first and second chambers 71, 7 are formed.
Since the two flow paths are communicated, the pressure water (high pressure) on the primary side of the ball valve main body 10 flows to the secondary side via the second and first chambers 72 and 71, and the water pressure in the secondary pipe To rise. At this time, the piston 75 rises as the water pressure rises,
The spring 77 is pushed up. When the water pressure in the secondary pipe reaches a predetermined value, the flow paths of the first and second chambers 71 and 72 are closed by the stem 76.

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 71 of the replenishing safety valve 70 also increases accordingly, and the water pressure is increased by the spring. 77 is pushed up to lift the piston 75 and the stem 76 upward. At this time, a gap is formed between the stem 76 and the lower O-ring 69, and the third and fourth chambers 73 and 74 are formed.
Are connected to each other, so that the pressure water (low pressure) on the secondary side of the ball valve body 10 is drained to the outside through the third and fourth chambers 73 and 74, and the water pressure in the secondary pipe decreases. Let it. Then, when the water pressure reaches the second pressure value, the spring 77 pushes down the piston 75 and the stem 76 to close the flow paths of the third and fourth chambers 73 and 74.

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 falls below the lower limit value, the replenishment safety valve 70 causes the high pressure on the secondary side as described above. Supply water. At this time, the bellows 54 and the rod 55 of the pressure switch 50 descend,
Accordingly, the rod 55 is separated from the contact of the PS-L 51, and the contact is switched from b to a to connect the DC motor 21 and the power supply (24 VDC). At this time, the DC motor 21 rotates forward to rotate the valve body of the ball valve body 10 in the opening direction, and supplies the primary-side pressurized water to the secondary side. The rotation of the rotation shaft 29 causes the limit switch 2
3 switches from a to b side, and the protrusion 28 presses the limit switch 24 to connect its contact to the b side, so that the fire receiving panel indicates that the valve body 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 according to the pressure increase, and the bellows 5
4. Push up the rod 55 together with 4. When the water pressure reaches 2.2 kg / cm ² , the rod 55
-Press the contact of L51 to switch to the b side DC motor 2
Stop the rotation of 1. When the water pressure on the secondary side further reaches the upper limit of 2.5 kg / cm ² , the rod 55
The contact point of the PS-H 52 is pressed by the water pressure to switch to the b side, and the DC motor 21 and the power supply are connected. 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. When the pressure reaches 3 kg / cm ² , the contact of the PS-H 52 is switched to “a” to stop the rotation of the DC motor 21.

Next, a case where the above-mentioned automatic alarm valve is used as a pressure regulating pre-operation type automatic alarm valve will be described. FIG. 9 is a system diagram of the pressure regulating pre-operation type automatic alarm valve, and FIG. 10 is a circuit diagram for explaining the operation. 1 to 8
The same or corresponding portions as those described in the above are denoted by the same reference numerals, and description thereof will be omitted.

When used as a pressure regulating pre-operation type automatic alarm valve, a switch 90 serving as an opening / closing means can be provided between the power supply (24 VDC) and the pressure switch 50. This switch 90 is provided on a fire receiving panel (not shown),
It is turned on in conjunction with the operation of a fire detector (not shown) in the same fire compartment as the pressure regulation pre-operation type automatic alarm valve. Even if the sprinkler head operates other than in a fire, the DC motor 21 of the valve body drive unit 20 that rotates the valve body is prevented from starting. When the water pressure on the secondary side rises due to a rise in temperature or decreases due to water leakage from a pipe joint or the like, the above-described replenishment safety valve 70 is adjusted. When a fire occurs, the fire detector in that fire compartment is activated and the sprinkler head starts watering. At this time, the switch 90 is turned on by the operation of the fire detector, and the contact point of the PS-L51 of the pressure switch 50 is switched to the a side due to a decrease in the secondary water pressure due to the sprinkler head spraying, so that the DC motor 21 is started. The primary side pressure water is supplied to the secondary side by rotating the valve body in the opening direction. At this time, the contact point of the limit switch 23 provided in the valve body drive unit 20 is switched to the b side, and the limit switch 24 detects the operation of the valve body and notifies the fire receiving board of the fact.

In the above embodiment, the first pressure value and the second pressure value of the replenishment safety valve 70 are different from the lower limit value and the upper limit value of the pressure detector. The lower limit value or the second pressure value and the upper limit value may be the same value.

[0028]

As described above, according to the present invention, a valve element detecting section for detecting the operation of the valve element and a supplementary safety valve are added to the pressure regulating valve for maintaining the secondary fluid pressure at a predetermined value. The automatic alarm valve can be configured by means of an automatic alarm valve.
The effect that the size is reduced, the construction is easy, and the equipment cost is reduced is obtained.

[Brief description of the drawings]

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

FIG. 2 is a circuit diagram for explaining the operation of a pressure regulating valve.

FIG. 3 is an external view of a pressure regulating valve.

FIG. 4 is a configuration diagram of a pressure switch.

FIG. 5 is a system diagram of an automatic alarm valve.

FIG. 6 is a circuit diagram for explaining an operation.

FIG. 7 is an external view of an automatic alarm valve.

FIG. 8 is a configuration diagram of a supplementary safety valve.

FIG. 9 is a system diagram of a pressure regulation pre-operation type automatic alarm valve.

FIG. 10 is a circuit diagram for explaining an operation.

[Explanation of symbols]

 Reference Signs List 10 Ball valve body 20 Valve drive unit 30 Remote test valve 40 Drain valve 50 Pressure switch 70 Refill safety valve 90 Switch

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A62C 37/00

Claims (3)

(57) [Claims] 1. A valve body having a valve body at a central portion, and a valve body drive unit having a motor provided on the valve body and connected to the valve body via a speed reduction means for reducing a rotation speed. A pressure chamber into which fluid on the secondary side of the valve body flows,
When the pressure of 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 rotate the valve body in the opening direction, and the pressure of the pressure chamber is set in advance. A pressure detector for rotating the valve in the closing direction by rotating the motor in the other direction when the value is equal to or greater than the upper limit. 2. A valve element detecting section provided in the valve element driving section, wherein the pressure detecting section detects operation of the valve element when the motor rotates in one direction, and is provided in the valve body section. The first and second pressure values are set in advance, and when the fluid pressure on the secondary side of the valve body falls below the first pressure value, the fluid pressure on the primary side of the valve body is reduced to the secondary side. 2. A fire extinguishing system according to claim 1, further comprising a replenishing safety valve for replenishing the secondary side fluid and discharging the secondary side fluid to the outside when the secondary side fluid pressure exceeds a second pressure value. Equipment pressure regulator. 3. A pressure control system for a fire extinguishing system according to claim 2, further comprising an opening / closing means provided between said pressure detecting unit and a power supply, and turned on when a fire detector detects a fire. apparatus.