JP2979253B2 - Sprinkler 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 sprinkler fire extinguishing system.

[0002]

2. Description of the Related Art Sprinkler fire extinguishing systems have conventionally used various systems such as open and closed wet and dry systems. Conventionally, in the closed type sprinkler fire extinguishing equipment, the fire extinguishing fluid pressurized up to the end of the closed type sprinkler head provided in each warning area is always filled, and water spraying operation can be taken simultaneously with fire detection, This is the most common equipment used for buildings and the like. In a closed-type sprinkler fire extinguishing system, a large amount of fire extinguishing liquid is released due to damage to the sprinkler head, etc. A pre-actuated type that fills and waters when the sprinkler head operates
(Pre-action type) There is a sprinkler fire extinguishing system. In this pre-operation type, the air is slightly pressurized in the pipe to the sprinkler head, and the fire extinguishing liquid is not released when the sprinkler head is damaged or malfunctions. Therefore, it is installed in a place where water damage such as a part is extremely disliked.

[0003]

In the closed-type sprinkler fire extinguishing system, the fire extinguishing solution pressurized up to the end of the pipe is always filled, so that the fire extinguishing solution can be discharged simultaneously with the operation of the sprinkler head by detecting the fire. There is a feature that there is. However, if the sprinkler head is opened due to an accident such as being hit by an object, the pressurized fire extinguishing liquid is released, the pressurizing device is started, and the pump is stopped after confirming that there is no fire Until the water is sprayed, there is a problem that the water loss continues.

On the other hand, a pre-actuated sprinkler fire extinguishing system
When the fire detector detects a fire and the closed type sprinkler head operates, that is, the fire extinguishing liquid is released only by the AND condition between the fire detector and the sprinkler head. Since it is only filled with pressurized air, it has the characteristic that even if the closed sprinkler head is opened due to impact or the like, a water damage accident does not occur. However, a compressor or the like is required to pressurize the secondary pipe to which the closed sprinkler head is connected, and the entire equipment becomes complicated and expensive. Since the discharged air comes out, there is a problem that a delay occurs before the fire extinguishing liquid starts to be discharged normally.

In order to compensate for the disadvantages of the above-mentioned conventional system, a fire detector and a closed type sprinkler head are provided in a security area, and a primary pipe of an opening valve is provided to a fire extinguishing liquid supply means.
The secondary pipe is connected to a closed type sprinkler head, and when the open valve is open, the fire extinguishing liquid in the primary pipe is reduced to a predetermined pressure and supplied to the secondary pipe. There has been proposed a sprinkler fire extinguishing system that can reduce the pressure resistance grade of the secondary piping system such as the secondary piping and the sprinkler head so as to reduce the equipment cost. However, in this sprinkler fire extinguishing system, there is always a large difference between the hydraulic pressure on the primary side and the secondary side of the release valve. Therefore, when the release valve is opened, a large primary pressure is momentarily introduced into the secondary piping system. Results in a large water hammer phenomenon
(Abnormal pressurization) occurs, and there remains anxiety about lowering the pressure-resistant grade of the above-mentioned equipment member of the secondary piping system. Also, in order to reduce the pressure-resistant grade of the secondary-side piping system components with confidence, the operation of adjusting the pressure of the fluid supplied thereto to the above-mentioned predetermined pressure must be performed reliably at all times. is there.

The present invention has been proposed to solve such various problems of the conventional sprinkler fire extinguishing system, and can sufficiently prevent a water hammer phenomenon when the opening valve is opened. In addition, the pressure reducing operation of the fire extinguishing liquid supplied to the secondary side piping system is always performed reliably, so that the pressure resistance grade of the equipment members of the secondary side piping system can be reduced with ease, and the equipment configuration is also improved. A simple and inexpensive sprinkler fire extinguishing system is provided.

[0007]

According to the present invention, in order to solve the above-mentioned problems, the primary pipe 16 is provided with a fire extinguishing liquid supply means 13.
An open valve 6 is connected to each of the sprinkler heads 4 in which the secondary pipe 5 is closed. The open valve 6 is normally closed, and the fire detecting means 1 detects a fire phenomenon.
In a sprinkler fire extinguishing system equipped with a pressure regulating device R that adjusts the pressure of the fire extinguishing liquid in the primary pipe 16 to a predetermined pressure and supplies it to the secondary pipe 5, the required liquid is supplied to the secondary pipe 5. A flow rate regulating means Q for passing the amount is provided, and the hydraulic pressure of the secondary pipe 5 to which the pressure regulator R responds is equivalent to the hydraulic pressure of the primary side of the flow rate regulating means Q.

The flow restricting means Q is configured to restrict the flow to the secondary side to a smaller value when the opening valve 6 is opened.

On the secondary side of the flow regulating means Q, there is provided a draining means E which operates at a hydraulic pressure slightly exceeding the predetermined pressure.

[0010]

The opening valve 6 is opened based on the detection signal of the fire detecting means 1, and the pressure fluid on the primary side 8 is adjusted to a predetermined pressure by the pressure regulator R and charged into the secondary pipe 5. At the time of this pressure reduction adjustment operation, the secondary side (sprinkler head 4 side) is operated by the action of the flow rate regulating means Q at the position of the flow rate regulating means Q.
A difference appears between the hydraulic pressure of the sprinkler head 4 and that of the primary side (opening valve 6 side), and the pressure of the sprinkler head 4 rises later than the opening valve 6 side. Thereby, the pressure reduction adjustment operation to the predetermined pressure by the pressure adjustment device R on the opening valve 6 side is reliably performed before the sprinkler head 4 side increases the pressure.

The flow restricting means Q acts to prevent a rapid rise in the hydraulic pressure in the secondary pipe 5 at the beginning of the opening of the opening valve 6, so that the occurrence of the water hammer phenomenon is suppressed.
By these means, the pressure-resistant gray of the secondary piping system components
Therefore, the sprinkler fire extinguishing equipment which does not need to be sufficiently low, does not cause breakage of equipment members due to the high-pressure liquid as in the related art, and can suppress the equipment cost.

Since the flow rate regulating means Q is configured to regulate the flow rate to the secondary side to a smaller value at the beginning of opening of the opening valve 6, abnormal pressure increase in the secondary side pipe 5 at the time of opening the valve. Are more reliably prevented.

The secondary side of the flow rate regulating means Q is provided with a drainage means E which operates with a hydraulic pressure slightly exceeding the predetermined pressure, so that when the sprinkler head 4 is opened, the pressure is regulated by the pressure regulating device R. Even when the operation is unstable, it is possible to discharge the fire-extinguishing liquid that has been adjusted to a reduced pressure that is substantially equal to the predetermined pressure instead of an excessively high hydraulic pressure.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a first embodiment of a sprinkler fire extinguishing system. A fire detector 1 of a differential type, a constant temperature type, or the like as a fire detecting means for detecting a fire phenomenon in a caution area is connected to a receiver 3 via an electric line 2. Similar to the fire detector 1, the closed type sprinkler head 4 provided on the ceiling of the caution area has a secondary pipe 5 and an orifice which is a flow regulating means Q for passing a required amount of liquid through the secondary pipe 5. 45
And to the secondary side 7 of the release valve 6. Release valve 6
The primary side 8 is connected to a pressurized liquid sending device 13 as a fire extinguishing liquid supply means via a primary side pipe 16, and is connected to a receiving valve by a gate valve 9, a pump 10, and an electric line 11 shown in FIG. In addition to the motor 12 connected to the motor 3 and the like, the pressurized liquid feeder 13 includes a normal check valve, a pressurized air tank, and the like, not shown.

The opening valve 6 is divided into the primary side 8 and the secondary side 7 by a valve seat 14a. A valve body 15 for opening and closing the valve seat 14a also serves as a piston fitted to a valve box. The back side and the valve box are formed in the cylinder chamber 20, and the secondary side 7
A signal inlet chamber 22 is formed by a valve seat 14b provided on the outer peripheral side of the valve seat 14a, and the valve body 15 is urged by a spring 18 to close the valve seats 14a and 14b. The valve body 15 is provided with a small hole 19 for introducing a part of the hydraulic pressure on the primary side 8. Also,
This valve element 15 reduces the hydraulic pressure of the primary pipe 16 to the above-mentioned predetermined pressure by the pressure adjusting pilot valve 21 as the pressure adjusting device R, and supplies it to the secondary side 7 (primary side of the flow rate regulating means Q). So that the opening and closing operation is controlled. That is, the pressure control pilot valve 21 has an operation chamber 17 that communicates with the cylinder chamber 20 via the pipe 23, a pressure control valve seat 26 that communicates the operation chamber 17 with the drain pipe 25 via the activation valve 24, and a flam 29. It has a pressure regulating valve body 28 urged in a direction to open the pressure regulating valve seat 26 by a spring 27, and a pressure regulating chamber 30 communicating with the secondary side 7 via a pipe 31.

A drain pipe 37 having an orifice 36 is connected to the signal inlet chamber 22. The drain pipe 37 is provided with a pressure switch 39 for detecting a pressure increase due to the opening of the opening valve 6 and notifying the receiving board 3 of the pressure increase. Provided. The start-up valve 24 is controlled by the receiving board 3 so as to be opened by a motor-driven unit 41 that operates by detecting a fire phenomenon of the fire detector 1. The electric unit 41 includes a motor and an electromagnetic solenoid. The end of the secondary pipe 5 is open to the atmosphere through an orifice 43 (located at a position higher than the secondary pipe 5 and the sprinkler head 4) and a drain pipe 44.

Next, the operation of the above embodiment will be described.
The starting valve 24 is initially closed. First, a non-pressure fire extinguishing liquid is filled in a secondary piping system such as the sprinkler head 4 and the secondary piping 5. In this liquid filling operation, the gate valve 9 is opened to pressurize the primary side 8 of the opening valve 6 by the pressurized liquid sending device 13, then the gate valve 9 is closed, the starting valve 24 is opened, and the cylinder chamber 20 is opened. The internal pressure is reduced so that the release valve 6 can be opened. Then, the gate valve 9 is gradually opened, and the fire extinguishing liquid slowly flows into the secondary piping system of the opening valve 6. The fire extinguishing liquid flows from the secondary side 7 of the release valve 6 to the secondary side pipe 5 and the sprinkler head 4, passes through the orifice 43, and flows down to the drain pipe 44. Firefighting fluid is orifice 4
At a point in time exceeding 3, the starting valve 24 is closed and the opening valve 6 is closed.

As a result, the pressure fluid acting on the secondary side piping system is discharged to the drain pipe 44 via the orifice 43, and the secondary side piping system is filled with no pressure. In this way, the secondary pipe system such as the secondary pipe 5 and the sprinkler head 4 is filled, and by using the orifice 43 to make the proportion of air communication small, diffusion of the fire extinguishing liquid into the atmosphere is prevented. It is possible to maintain the pressureless liquid state for a long period of time. In a normal state in which the fire detector 1 is not operated, the fire extinguishing liquid on the primary side 8 of the opening valve 6 in each warning area enters the cylinder chamber 20 through the small hole 19, and the valve body 15 is actuated by the hydraulic pressure of the cylinder chamber 20 and the spring 18. The valve seats 14a and 14b are closed, and the valve body 15
Is in the monitoring state. Since the fire extinguishing liquid in the secondary pipe 5 and the like is filled without pressurization, there is no loss of fire extinguishing liquid during monitoring.

In this state, when a fire occurs and the fire detector 1 operates, a fire signal is transmitted to the receiver 3.
In the receiving panel 3, the electric section 41 is operated by the fire signal to open the starting valve 24, so that the hydraulic pressure in the cylinder chamber 20 of the opening valve 6 is discharged from the drain pipe 25 through the operation chamber 17 and the hydraulic pressure is reduced. The opening valve 6 is opened by the hydraulic pressure on the primary side 8, the hydraulic pressure in the signal inlet chamber 22 increases, and the pressure switch 39 operates to notify the receiving board 3 of the opening of the opening valve 6. on the other hand,
The pressure liquid on the primary side 8 flows to the secondary side pipe 5 and the pipe 31 via the secondary side 7 by a pressurizing means such as a pressure air tank (not shown). When the hydraulic pressure of the secondary pipe 5 rises and the hydraulic pressure applied from the pipe 31 to the pressure regulating chamber 30 pushes the flam 29 and the pressure regulating valve body 28 downward to reach a predetermined pressure, the pressure regulating valve seat 26 closes and the drain is closed. Drainage from tube 25 stops. When the hydraulic pressure on the secondary side 7 introduced into the pressure regulating chamber 30 falls below the set pressure of the pressure regulating pilot valve 21, the pressure regulating valve body 28 is returned by the spring 27, the pressure regulating valve seat 26 is opened, and the cylinder chamber 20 is opened. The pressurized liquid is in the operation room 17
The valve body 15 is returned by the hydraulic pressure on the primary side 8 to open the valve seats 14a and 14b, the fire extinguishing liquid on the primary side 8 is introduced into the secondary side 7, and the hydraulic pressure on the secondary side 7 Thus, the hydraulic pressure of the secondary side 7 is reduced and adjusted to a predetermined pressure required for the fire extinguishing activity as compared with the hydraulic pressure of the fire extinguishing liquid on the primary side 8 in this way.

When the pressure is increased while the opening valve 6 is open, the orifice 45 at the position of the orifice 45, which is the flow rate regulating means Q, has its secondary side (sprinkler head 4 side) and primary side (opening) due to the flow rate regulating action of the orifice 45. There is a difference in hydraulic pressure between the sprinkler head 4 and the sprinkler head 4, and the pressure rises later than the opening valve 6. Then, in the pressure-reducing adjustment operation of the pressure-controlling pilot valve 21 as the pressure-regulating device R, the pressure-reducing operation of the pressure-controlling pilot valve 21 located on the opening valve 6 side must be performed before the sprinkler head 4 side is pressurized. Will be done. Thereby, the orifice 45
A low-pressure fire-extinguishing liquid whose pressure has been reliably reduced and adjusted by the pressure regulating pilot valve 21 is introduced into the secondary-side piping system such as the secondary-side piping 5 and the sprinkler head 4 which are the secondary side of the secondary side. The pressure-resistant grade of the equipment members of the secondary piping system can be reduced with confidence.

Further, when the pressure regulating operation by the pressure regulating pilot valve 21 at the moment when the opening valve 6 is opened cannot be sufficiently exerted, the flow rate to the secondary pipe 5 is regulated by the orifice 45. A sprinkler fire extinguishing system that prevents abnormal pressure rise in the secondary pipe 5 and prevents the water-hammer phenomenon from occurring, does not cause breakage of equipment members based on high-pressure liquid as in the related art, and can reduce equipment costs. became.

When the temperature at the fire point further rises, the sprinkler head 4 is opened and the fire extinguishing liquid in the secondary pipe 5 is discharged, and a large decrease in the hydraulic pressure on the secondary side 7 causes a pressure switch in a pressure air tank (not shown). Is detected, the pump 10 of the pressurized liquid sending device 13 is activated, and this discharge is continued until the fire is extinguished. Since the fire extinguishing liquid is already filled in the secondary side pipe 5 such as the sprinkler head 4 at a predetermined pressure, the fire extinguishing liquid is discharged simultaneously with the opening operation of the sprinkler head 4, and there is no delay in the fire extinguishing operation. Here, the pump 10 of the pressurized liquid sending device 13 may be started by detecting the continuous pressurizing time of the pressurizing unit.

In addition to the above, a compressor for constantly pressurizing the secondary pipe 5 with air, such as a pre-operation type, is not required in this embodiment, and the equipment cost is reduced. At the time of fire monitoring, a small amount of non-pressure fire extinguishing liquid is released when the sprinkler head 4 is opened due to an impact or the like, and a large water damage accident such as in a conventional closed sprinkler fire extinguishing system can be prevented.

FIG. 2 is a block diagram showing a second embodiment of the present invention. The second embodiment has the same configuration as the first embodiment except that a constant flow valve 46 is used instead of the orifice 45 in the first embodiment as the flow restricting means Q, and both are the same. The reference numerals are used and the description of the structure is omitted. Also in the second embodiment, at the position of the constant flow valve 46, which is the flow restricting means Q, when the pressure is increased while the release valve 6 is open, the secondary flow (sprinkler head) is performed by the flow restricting action of the constant flow valve 46. 4) and the primary side (opening valve 6 side), a difference appears in the hydraulic pressure, and the pressure of the sprinkler head 4 side rises later than the opening valve 6 side. The pressure reducing operation of the pressure pilot valve 21 is necessarily performed before the pressure on the sprinkler head 4 side is increased, and the secondary pressure is controlled by the secondary piping system such as the secondary pipe 5 on the secondary side of the orifice 45 and the sprinkler head 4. Is the pressure control pilot valve 2
1. The low-pressure fire extinguishing liquid, which is surely depressurized and adjusted by step 1, is introduced, so that the pressure-resistant grade of the secondary-side piping system members can be reduced with ease, and the pressure is adjusted instantaneously when the opening valve 6 is opened. When the pressure regulating action by the pilot valve 21 cannot be sufficiently exerted, the flow rate to the secondary pipe 5 is regulated by the constant flow valve 46, and the water hammer phenomenon in the secondary pipe 5 does not occur. In addition to the main effect that the sprinkler fire extinguishing equipment is capable of suppressing equipment cost without causing damage to equipment members based on high-pressure liquid as in the related art, and in addition to the main effect, the secondary side pipe 5 is always operated as a pre-operation type. A compressor for pressurizing with air is not required, and during fire monitoring, a small amount of non-pressure fire extinguishing liquid is released when the sprinkler head 4 is opened due to an impact or the like. Also it has the additional advantage that resold Do large water loss accident can be prevented.

FIG. 3 is a block diagram showing a third embodiment of the present invention. In the third embodiment, a small diameter port is used as the flow rate regulating means Q instead of the orifice 45 in the first embodiment.
A two-way orifice valve 47 having a large-diameter port 49 and a large-diameter port 50 is used to switch between the small-diameter port 49 and the large-diameter port 50 by using a motor, a solenoid, or the like. Electric part 42
The configuration is the same as that of the first embodiment except that the following description is made. The same reference numerals are given to the same components, and the description of the structure is omitted.

In the third embodiment, during monitoring, the pipe 46 connected to the secondary side 7 of the release valve 6 and the secondary
The secondary orifice valve 47 is controlled to a position where the small-diameter port 49 of the one-way orifice valve 47 communicates. As in the first embodiment, in a normal state where no fire occurs, the secondary-side piping system is filled with no pressure. When a fire occurs and the fire detector 1 operates, the opening valve 6 is opened by the operation of each part similar to the first embodiment. Since the pressure fluid from the pipe 46 is throttled by the small-diameter port 49 and flows into the secondary pipe 5, the hydraulic pressure gradually increases, and the water-hammer phenomenon due to the inflow does not occur. −G4
9, the hydraulic pressure in the secondary side 7 before the two-way orifice valve 47, the pipes 31 and 46, the pressure regulating chamber 30 and the like increases immediately after the opening valve 6 is opened. Since the opening degree of the valve body 15 is small at the beginning of opening, the above-described pressure regulating operation by the pressure regulating pilot valve 21 is sufficiently performed before the hydraulic pressure of the secondary side pipe 5 abnormally increases. Tar
Hammer phenomenon suppression is ensured.

When the hydraulic pressure of the secondary pipe 5 is
When the preliminary pressure is slightly lower than the predetermined pressure by the pressure adjustment of 1, the pressure switch 40 (or a command from timer means (not shown) provided in the receiving panel 3 or the like) causes the electric unit 42 to operate.
Operates to connect the large-diameter port 50 to the secondary pipe 5 and the pipe 46.
The two-way orifice valve 47 is controlled to rotate at a position where the fluid communicates, and the pressure liquid on the secondary side 7 of the opening valve 6 is introduced from the large-diameter port 50 to the secondary side pipe 5 while being slightly throttled. The hydraulic pressure applied to the secondary pipe 5 when the large-diameter port 50 is opened is a small differential pressure between the regulated hydraulic pressure and the hydraulic pressure of the secondary pipe 5 which has already increased to the preliminary pressure. Therefore, the abnormal pressure increase due to the opening of the bypass valve 34 is extremely small. When the pressure is raised while the opening valve 6 is open, the position of the two-way orifice valve 47, which is the flow rate regulating means Q, is increased by the flow rate regulating action of the large-diameter port 50 of the two-way orifice valve 47. A difference appears in the hydraulic pressure between the side (sprinkler head 4 side) and the primary side (opening valve 6 side), and the sprinkler head 4 side rises in pressure later than the opening valve 6 side. The pressure-reducing operation of the pressure-regulating pilot valve 21 is always performed before the pressure of the sprinkler head 4 is increased, so that the secondary pipe 5, the secondary side of the two-way orifice valve 47, the sprinkler head 4, etc. The pressure control pilot valve 2
1 ensures that a low-pressure fire extinguishing liquid whose pressure has been reduced and adjusted is introduced.

In the third embodiment, too, when the opening of the opening valve 6 is not sufficiently performed by the hydraulic pressure regulating pilot valve 21, the rapid increase of the hydraulic pressure in the secondary pipe 5 is suppressed by the small diameter port 49. When the port is switched to the large-diameter port 50, the pressure increase is slight and the water hammer phenomenon does not occur, and while the opening valve 6 is open, the pressure is regulated by the flow rate regulation by the large-diameter port 50. The pressure-reducing operation by the pressure pilot valve 21 is reliably performed, and the device members based on the high-pressure liquid are not damaged as in the prior art. It is possible,
In addition to the main effect of being a sprinkler fire extinguishing system that can also reduce equipment costs, since the secondary side pipe 5 such as the sprinkler head 4 is filled with a fire extinguishing liquid at a predetermined pressure, the sprinkler head 4 is simultaneously opened. The fire-extinguishing liquid is discharged and there is no delay in the fire-extinguishing operation, and a compressor for constantly pressurizing the secondary pipe 5 with air as in the pre-actuated type becomes unnecessary. The pressureless fire extinguishing liquid that is released when the fire is opened in the step is small, and has an additional effect that a large water damage accident such as a conventional closed-type sprinkler fire extinguishing system can be prevented.

FIG. 4 is a block diagram showing a fourth embodiment of the present invention. In the fourth embodiment, a pressure liquid is introduced into the secondary pipe 5 through the small hole 51 at the beginning of opening of the opening valve 6 instead of the two-way orifice valve 47 in the third embodiment as the flow rate regulating means Q. Then, when the hydraulic pressure of the secondary pipe 5 reaches the above-mentioned preliminary pressure, a flow regulating valve 53 having a structure for supplying pressure fluid to the secondary pipe 5 from the regulating valve seat 52 opened by the preliminary pressure is provided. The configuration is the same as that of the third embodiment except that it is used. The same reference numerals are given to the same components, and the description of the structure is omitted.

The illustrated flow control valve 53 has a small hole 51 and a flam 59, and a control valve body 55 in which the control valve seat 52 is closed by a spring 54, and a liquid passage chamber 56 containing the control valve seat 52. And the liquid passage chamber 56 is connected to the pipe 46 and the cylinder chamber 3.
It is constituted by a pipe 57 that communicates with the pressure chamber 0 and an adjustment chamber 58 that introduces the pressure fluid in the secondary pipe 5.

When the opening valve 6 is opened, the regulating valve body 55 remains seated on the regulating valve seat 52, and the pressure fluid flows from the small hole 51 only to the secondary pipe 5. When the hydraulic pressure of the secondary pipe 5 increases and reaches the preliminary pressure slightly lower than the predetermined pressure, the flam 59 pushes the adjusting valve body 55 by the hydraulic pressure of the adjusting chamber 58 to open the adjusting valve seat 52, and Thereafter, the fire extinguishing liquid whose flow rate has been adjusted by the pressure regulator R is supplied to the secondary pipe 5.
When the opening valve 6 is opened, the pressure fluid from the pipe 46
Since it is throttled by 1 and flows into the secondary pipe 5, its hydraulic pressure gradually increases, and the water-hammer phenomenon does not occur.

The hydraulic pressure applied to the secondary pipe 5 when the hydraulic pressure in the secondary pipe 5 becomes the preliminary pressure and the regulating valve seat 52 is opened increases to the adjusted hydraulic pressure and the preliminary pressure. Pressure difference from the hydraulic pressure of the secondary pipe 5 which is
The abnormal pressure increase due to the opening of 2 is extremely small. When the pressure is increased while the opening valve 6 is open, the secondary side (the sprinkler head 4 side) and the primary side of the pressure regulating valve 53 which is the flow regulating means Q are opened by the flow regulating action of the regulating valve seat 52 at the open position.
A difference appears in the fluid pressure from the (opening valve 6 side), and the sprinkler head 4 side increases in pressure later than the opening valve 6 side, so the pressure reduction of the pressure regulating pilot valve 21 located on the opening valve 6 side. The operation is always performed before the pressure of the sprinkler head 4 is increased, and the secondary piping system such as the secondary piping 5 and the sprinkler head 4 on the secondary side of the flow control valve 53 includes:
The low-pressure fire extinguishing liquid, which is surely reduced in pressure by the operation of the pressure regulating pilot valve 21, is introduced.

Also in the fourth embodiment, when the pressure regulating pilot valve 21 cannot sufficiently exert the pressure regulating function at the beginning of the opening of the release valve 6, the small hole 51 suppresses the sudden increase in the hydraulic pressure of the secondary pipe 5; When the regulating valve seat 52 is opened, the pressure increase is slight and the water hammer phenomenon does not occur. When the opening valve 6 is open, the pressure is regulated by the regulating valve pilot valve 21 by regulating the flow rate by the regulating valve seat 52. The adjustment operation is performed reliably, and the equipment members based on the high-pressure liquid are not damaged as in the prior art. With these, the pressure resistance grade of the equipment members of the secondary piping system can be reduced with ease, and equipment costs can be reduced. In addition to the main effect of being a sprinkler fire extinguishing system that can also suppress the occurrence of fire, the fire extinguishing liquid is filled at a predetermined pressure in the secondary pipe 5 such as the sprinkler head 4, so that the sprinkler head 4 is opened at the same time. The fire-extinguishing liquid is discharged and there is no delay in the fire-extinguishing operation, and a compressor for constantly pressurizing the secondary pipe 5 with air as in the pre-actuated type becomes unnecessary. The pressureless fire extinguishing liquid that is released when the fire is opened in the step is small, and has an additional effect that a large water damage accident such as a conventional closed-type sprinkler fire extinguishing system can be prevented. In the third embodiment, a power source such as the electric section 42 for the orifice switching operation of the two-way orifice valve 47, which is the flow rate regulating means Q, is required. According to this, such a power supply is not required, and the configuration is simplified.

FIG. 5 is a block diagram showing a fifth embodiment of the present invention. In the fifth embodiment, on the secondary side of the flow rate regulating means Q, between the end of the secondary pipe 5 and the drain pipe 44,
Except for providing a safety valve 61 as a drainage means E that operates at a hydraulic pressure slightly exceeding the predetermined pressure by the pressure regulating pilot valve 21, the configuration is the same as that of the first embodiment, and both have the same reference numerals. And the description of the structure is omitted. The illustrated safety valve 61 includes a drain valve seat 62 that opens at the end of the secondary pipe 5, and a drain valve body 64 urged by a spring 63 to close the drain valve seat 62. .

When the opening valve 6 is opened, the drain valve body 64 closes the drain valve seat 62. The pressure adjusting device R sets the adjustment pressure slightly higher than the predetermined pressure in consideration of the pipe loss from the secondary side 7 of the opening valve 6 to the sprinkler head 4. The filling pressure from the beginning of opening until the sprinkler head 4 is opened is higher than a predetermined pressure. However, when the hydraulic pressure of the secondary pipe 5 exceeds the predetermined pressure, the drain pressure is increased by the hydraulic pressure. 62 is opened and the fire extinguishing liquid is drained from the drain pipe 44, so that the inside of the secondary pipe 5 is maintained at a predetermined pressure. As a result, when the sprinkler head 4 was initially opened, the fire extinguishing liquid higher than the predetermined pressure was conventionally discharged. However, by providing such a safety valve 61 at the end of the secondary pipe 5, the above-mentioned safety valve 61 is also provided at the beginning of the opening. This made it possible to discharge the fire-extinguishing liquid that was adjusted to a predetermined pressure.

In the fifth embodiment, similarly to the first embodiment, when the pressure is increased while the opening valve 6 is open, the pressure regulating pilot valve is actuated by the flow regulating action of the orifice 45 which is the flow regulating means Q. The pressure reduction adjustment operation of the sprinkler head 4
When the pressure regulating operation by the pressure regulating pilot valve 21 cannot be sufficiently performed at the moment when the release valve 6 is opened, the flow rate to the secondary side pipe 5 is regulated by the orifice 45. Water in the secondary side pipe 5
In addition to the main effect that the hammer phenomenon does not occur, the sprinkler fire extinguishing equipment which does not cause breakage of the equipment members based on the high-pressure liquid as in the conventional case and can reduce the equipment cost, A compressor for constantly pressurizing with air as in the pre-actuated type is not required, and during fire monitoring, a small amount of non-pressure fire extinguishing liquid is released when the sprinkler head 4 is opened due to an impact or the like. There is an additional effect that a large water damage accident such as a closed sprinkler fire extinguishing system can be prevented.

In each of the illustrated examples, the pressure regulating pilot valve 21 is formed separately from the opening valve 6. However, the pressure regulating pilot valve 21 may have a structure in which these are integrated. However, there is no problem even if a so-called press-open structure, in which the cylinder chamber is opened by pressurizing, is opened instead of the pressure-reducing open structure shown in the drawing. In the above embodiment, the opening of the release valve 6 is not limited to the one based on the signal of the fire detector 1, and may be performed by a pressure change due to the opening of the sprinkler head in the secondary pipe 5 of a small pressure. Alternatively, even when no pressure is applied, the opening operation of the sprinkler head may be performed by a contact detecting the opening operation. Further, a configuration equivalent to the drainage unit E of the fifth embodiment can be added to the first to fourth embodiments.

[0038]

As described above, according to the present invention, the secondary side (sprinkler head 4 side) and the primary side (opening) at the position of the flow rate regulating means Q at the position of the flow rate regulating means Q during the pressure reduction adjusting operation. The sprinkler head 4 increases its pressure later than the opening valve 6 side, and the sprinkler head 4 increases its pressure to a predetermined pressure by the pressure regulating device R on the opening valve 6 side. The pressure reduction adjustment operation is reliably performed before the pressure of the sprinkler head 4 is increased.

A sudden rise in hydraulic pressure in the secondary pipe 5 at the beginning of opening of the opening valve 6 is prevented by the flow rate regulating means Q, and the occurrence of the water hammer phenomenon is suppressed. By these means, the sprinkler fire extinguishing equipment which can reduce the equipment pressure based on the high-pressure liquid and the equipment cost can be reduced without requiring the pressure-resistant grade of the equipment of the secondary piping system to be sufficiently low. became.

Since the flow rate regulating means Q is configured to regulate the flow rate to the secondary side to a smaller value at the beginning of opening of the opening valve 6, the abnormal pressure increase in the secondary side pipe 5 at the time of the opening is performed. Are more reliably prevented.

Since the drainage means E which operates at a hydraulic pressure slightly exceeding the predetermined pressure is provided on the secondary side of the flow regulating means Q, when the sprinkler head 4 is opened, the pressure is adjusted by the pressure adjusting device R. Even when the operation is unstable, it is possible to discharge the fire-extinguishing liquid which has been adjusted to a reduced pressure substantially equal to the predetermined pressure instead of the excessive hydraulic pressure.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a block diagram showing a third embodiment of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire detector (fire detection means) 4 Sprinkler head 5 Secondary piping 6 Opening valve 16 Primary piping 21 Pressure regulating pilot valve (pressure regulating device R) 45 Orifice (flow regulating device Q) 46 Constant flow valve (flow regulating) Means Q) 47 Two-way orifice valve (Flow regulating means Q) 53 Flow regulating valve (Flow regulating means Q) E Drainage means

Claims (3)

(57) [Claims] An open valve connected to a fire extinguishing liquid supply means on the primary side and a closed type sprinkler head on the secondary side is provided, and the open valve is normally in a closed state to prevent a fire phenomenon. In the sprinkler fire extinguishing system equipped with a pressure regulating device that adjusts the pressure of the fire extinguishing fluid in the primary pipe to a predetermined pressure and supplies it to the secondary pipe, it becomes open due to the signal based on the fire detection means to be detected. A sprinkler fire extinguishing system, characterized in that a flow regulating means for passing a liquid amount is provided, and a hydraulic pressure of the secondary pipe to which the pressure regulator responds corresponds to a hydraulic pressure of a primary side of the flow regulating means. 2. The sprinkler fire extinguishing system according to claim 1, wherein the flow rate regulating means is configured to regulate the flow rate to the secondary side to be smaller at the beginning of opening of the opening valve. 3. The sprinkler fire extinguishing system according to claim 1, further comprising a drainage unit that operates at a hydraulic pressure slightly exceeding the predetermined pressure on a secondary side of the flow rate control unit.