JPH10155930A - Sprinkler fire extinguishing equipment and its accelerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of an open valve, prevent seal leakage, facilitate manufacturing management for an orifice of an accelerator, and prevent clogging of refuse. SOLUTION: An open valve comprises a valve element for opening and closing a communicating port, and a balancer which is connected to the valve element and subjected to hydraulic pressure of the primary side to reduce hydraulic pressure applied to the valve element, and a liquid chamber 40 of an accelerator 30 comprises a cylinder part blocked by an elastic film, a piston part 49 connected to a valve to partition the cylinder part into a first chamber and a second chamber, an orifice 51 formed on the piston part 49 to communicate both chambers with each other, and a gas bag stored in the second chamber.

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 and an accelerator.

A dry sprinkler fire extinguishing system is provided with an opening valve. The opening valve has a valve body that opens and closes a communication port between a primary side and a secondary side, and the primary side of the valve body is connected to a main pipe connected to a water source, and the secondary side is provided with a compressed air supply port. Connected to the filled pipe.

In this fire extinguishing system, when a sprinkler head provided in the pipe is opened due to the occurrence of a fire or the like, the compressed air on the secondary side is released, and the pressing force on the secondary side of the valve body is reduced by the primary side of the valve body. Becomes smaller than the pressing force. Then, the opening valve is opened, and the fire extinguishing water on the primary side flows into the secondary side while pressing the compressed air, and is discharged from the sprinkler head.

[0004] The number of sprinkler heads to be disposed is determined according to the size of the water discharge target area. In the case of a large floor, a large number of sprinkler heads are required, and a long piping is accordingly required. Required.

However, if the total length of the pipe is long, the amount of air in the pipe is large, so that even if the release of compressed air from the sprinkler head opened by the fire is started, the pressure in the pipe drops rapidly. Until the pressure on the secondary side becomes the valve opening pressure, that is, the low pressure at which the valve element opens,
It takes considerable time.

Therefore, since it takes a long time from when the sprinkler head is opened to when the valve element is opened, it takes a long time before the fire extinguishing water on the primary side is discharged from the sprinkler head. Fire fighting becomes difficult.

Therefore, in order to quickly open the release valve,
An accelerator is used. This accelerator is
The primary side inlet is connected to the secondary side of the opening valve, and the secondary side outlet is connected to the primary side pressurizing chamber of the valve body.

The accelerator comprises a diaphragm for partitioning the body into an air chamber and a fluid chamber, a primary inlet and a secondary outlet provided in the fluid chamber, and an inlet provided in the fluid chamber from the primary inlet. A fluid passage that is spaced apart and has an outlet communicating with the secondary outlet, a valve that opens and closes the inlet of the fluid passage, and a spring that presses the valve against a valve seat; the fluid chamber fixed to the valve and the diaphragm; A communication pipe for communicating the air chamber with the air chamber; and an orifice provided in the pipe.

In this accelerator, the air chamber is sealed, air on the secondary side flows into the air chamber until the pressure on the secondary side is reached, the fluid chamber and the air chamber have the same pressure, and the valve has an inlet. To close.

When the pressure in the air chamber decreases due to seasonal temperature changes or minute leaks, the air in the air chamber flows out into the fluid chamber via the communication pipe by the amount of the differential pressure. At this time, a force acts to move the valve and the diaphragm in the direction of air flow, but the force is small because the differential pressure is very small. Therefore, the valve does not open because it cannot overcome the force of the spring.

When the sprinkler head opens due to a fire, the pressure on the secondary side of the release valve decreases, and the pressure in the fluid chamber of the accelerator also sharply decreases. Therefore, the pressure in the air chamber becomes larger than that in the fluid chamber, and the air in the air chamber attempts to flow into the fluid chamber via the communication pipe.

However, since the pipe has an orifice, only a small amount can be discharged into the fluid chamber. Because the diaphragm is pushed down,
The valve is opened, the air at the primary inlet is discharged from the secondary outlet through the flow passage, and the pressurizing chamber of the open valve is pressurized. It is opened before the pressure drops, and the primary fire extinguishing water is quickly supplied to the secondary piping.

[0013]

The valve element of the conventional open valve is fixed to a swing arm which is rotatable by a clapper method, and a sealing rubber is provided at a contact portion of the valve element with a valve seat. Is provided. However, this valve has the following problems.

(1) The valve element receives the pressure of fire-extinguishing water on the water pressure receiving surface on the primary side and receives the pressure of compressed air on the air pressure receiving surface on the secondary side. Then, the area A ₁ of the water pressure receiving surface area A ₂ of the air pressure-receiving surface, the pressure P ₁ of the primary side, the pressure P ₂ on the secondary side to maintain a closed state when the following conditions are satisfied. P ₁ A ₁ ≦ P ₂ A ₂ Normally, the ratio of the pressure P ₁ on the primary side to the pressure P ₂ on the secondary side, that is, the operating pressure ratio is set to, for example, 5: _1. Is approximately equal to A ₂ , the area A ₂ of the air pressure surface is five times the area A ₁ of the water pressure surface, a large space is required for the rotation of the valve body, and the body becomes large.

Therefore, the area A ₁ is reduced, and the area A ₂
May be reduced. However, since the area A ₁ corresponds to the cross-sectional area of the communication port between the primary side and the secondary side, when it decreases, it is necessary to increase the air pressure of the secondary side, the air pressure is high large compressor And the problem of seal leakage occurs.

If the air pressure surface of the valve body is large, the primary side pressurizing chamber is correspondingly large, and the main body is also large.

(2) The valve body is of a clapper type and is fixed to a rotatable swing arm, and a sealing rubber is provided at a contact portion of the valve seat. The abutting portion has a ring-shaped seal mark, that is, a habit.

In the case of the clapper type requiring play, if the swing arm is rotated to open the valve and then the swing arm is rotated in the opposite direction to seat the seat, the valve seat and the ring-shaped seal mark are displaced from each other. In some cases, seal leakage may occur.

The conventional accelerator has the following problem. (1) Dirt clogs the orifice provided in the communication pipe,
May not work properly. (2) Since the air passing through the orifice has low viscosity,
If this aperture is not formed exactly as designed, the accelerator will not operate properly. However, since the diameter of the orifice is small, its production management becomes extremely difficult.

In view of the above circumstances, it is an object of the present invention to reduce the size of an apparatus and to prevent the occurrence of seal leakage. Another object is to prevent clogging of the orifice with debris and to facilitate manufacturing control.

[0021]

According to the present invention, there is provided a body having an inlet and an outlet, a liquid chamber fixed in the body and sealed with a liquid, and communicating with the inlet and the outlet to form the liquid chamber. An accelerator comprising a surrounding gas chamber, and a valve for opening and closing the outlet, wherein the liquid chamber is connected to the bottomed cylinder portion having an open end closed by an elastic film, and connected to the valve, and , The cylinder part in the first chamber and the second chamber
And an orifice formed in the piston portion and communicating with the two chambers, and a gas bag stored in the second room.

According to the present invention, there is provided a communication port for communicating a primary side and a secondary side of a main body, a valve element provided downstream of the communication port for opening and closing the communication port, and a valve provided on the primary side. An opening valve having a pressurizing chamber for applying a forced valve opening force to a body, a primary inlet connected to a secondary side of the opening valve, and a secondary outlet communicating with the pressurizing chamber of the opening valve. And a sprinkler fire extinguishing system comprising: an accelerator, wherein the valve element of the opening valve includes sliding guide means, and a pressurizing chamber is connected to the valve element;
And, comprising a slidable balancer receiving the water pressure on the primary side, the accelerator has a body having an inlet and an outlet,
A liquid chamber fixed in the body and sealed with a liquid, a gas chamber communicating with the inlet and the outlet, surrounding the liquid chamber, and a valve for opening and closing the outlet; and A cylinder section closed by an elastic membrane, a piston section connected to the valve for dividing the cylinder section into a first chamber and a second chamber, and an orifice formed in the piston section to communicate the two chambers And a gas bag stored in the second room.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A communication port between a primary side and a secondary side of an opening valve is opened and closed by a valve element provided downstream of the communication port. A pressurized chamber provided with a balancer is provided on the primary side of the release valve. This balancer is connected opposite to the valve body and receives the water pressure on the primary side, and the water pressure on the primary side applied to the valve body is reduced by the balancer and most of the pressure is canceled, so even if the water pressure on the primary side is high, The force in the valve opening direction that the valve body receives is small.

The valve body is provided with a sliding guide.
The guide regulates the movement of the valve element and prevents a displacement between the valve element and the valve seat when the valve is closed.

The pressurizing chamber is connected to an accelerator. When the balancer in the pressurizing chamber is pressed in the valve opening direction by the operation of the accelerator, the valve body separates from the valve seat against the pressure on the secondary side and is forcibly opened.

The arrangement of the valve element and the balancer and the sliding direction thereof are appropriately selected as necessary. For example, they are disposed in a direction perpendicular to the axis of the opening valve and slid in the orthogonal direction.
Also, it is arranged in a direction parallel to the axis and slides in the parallel direction.

The accelerator has a liquid chamber fixed in the body, a gas chamber surrounding the liquid chamber, an inlet and an outlet communicating with the gas chamber, and a valve for opening and closing the outlet.

The liquid chamber has a bottomed cylinder having an open end covered with an elastic film such as rubber, and a piston inserted into the cylinder to partition the liquid chamber into a first chamber and a second chamber. A part, an orifice provided in the piston part and communicating the two chambers, and a gas bag provided in the second chamber,
It has. The piston is connected to the valve via a slidable connecting rod.

The liquid chamber is filled with a slow fluid such as silicone oil, but is not necessarily limited to this oil. Air of a predetermined pressure is sealed in the gas bag. The shape and size of the bag, the type of gas to be sealed, the number of used gas, and the like are appropriately selected as necessary.
The valve is pressed against the outlet via a spring stretched between the piston and the valve.

In this accelerator, when the pressure in the gas chamber decreases, the liquid flows from the second chamber into the first chamber through the orifice. However, since the amount of this inflow is small, only a quantity corresponding to the rapid pressure change is provided. Liquid cannot be moved.
Therefore, the piston moves down, so that the valve moves against the spring force of the spring and opens.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The primary side 2 of the opening valve 1 is connected to a water source 5 via a main pipe 3 and a pump 4, and the secondary side 6 is connected to a pipe 8 provided with a sprinkler head 7. The sprinkler head 7 is a closed-type sprinkler head, and the inside of the pipe 8 is filled with compressed air.

As shown in FIGS. 1 and 2, the release valve 1 has a valve body 15 for opening and closing a communication port 11 between the primary side 2 and the secondary side 6 of the main body 10. This valve element 15 has a diameter D ₁₀ = 150
mm disc, which is seated on the valve seat 16 and whose primary side 2
The water pressure receiving surface 2a and the air pressure surface 6a of the secondary side 6 are formed in a circular shape having a diameter D ₁₀ = 150 mm. The valve body 10 is provided with a seal member 15 a made of rubber or the like at a portion that comes into contact with the valve seat 16.

The communication port 11 is provided on the primary side 2 of the main body 10.
A pressurizing chamber 18 is provided opposite to. This pressurizing chamber 1
8 includes a cylinder portion 19 and a piston portion 20 slidably inserted into the cylinder portion 19, and the piston portion 20 generates a force generated by the primary side to open the valve body 15. Of the balancer BL that cancels most of the above.

The piston portion 20 has, for example, a diameter D ₂₀
= 130 mm, and receives forces in mutually opposite directions, that is, the pressure of the fire extinguishing water W on the primary side 2 and the pressure of the air K in the pressurizing chamber 18 opposed to this pressure. Since the piston portion 20 is connected to the valve body 15, the movement stops when the valve body 15 is seated.

The piston portion 20 and the valve body 15 are fixed to the guide rod 21 so as to face each other on the primary side. The rod 21 is orthogonal to the axis C of the main body 10 and is slidably supported by the guide support 22. The rod 21 slides and guides the valve body 15 in the direction of arrow A15, and its diameter and length are appropriately selected as needed.

The secondary side 6 of the release valve is connected to a primary side inlet 60 of the accelerator 30 via a drawing pipe 31. The accelerator 30 has a body 41 having a primary side inlet 60 and a secondary side outlet 61 as shown in FIGS.
And a liquid chamber 40 provided in the body 41, a gas chamber 45 surrounding the liquid chamber 40, and a valve 70 for opening and closing an outlet 61 of the body.

The body 41 has a base 57 and a side wall 57a erected on the base 57. The base 57 has a primary inlet 60 communicating with the secondary side of the opening valve 1, A secondary side outlet 61 communicating with the pressurizing chamber 18 of the valve 1 is formed. A cap-shaped cover 58 is screwed on the outer surface of the open end of the side wall 57a, and the liquid chamber 40 is provided on the inner surface thereof.
Is screwed.

The liquid chamber 40 has a bottomed cylindrical cylinder section 46 whose opening is closed by an elastic body, for example, a cap-shaped rubber film 47. A piston part 49 for partitioning into a first chamber 40a and a second chamber 40b, an orifice 51 provided in the piston part 49 for communicating the two chambers 40a and 40b, and connecting the piston part 49 and the valve 70 A slidable connecting rod 50 and a gas bag 48 housed in the second chamber 40b. The first chamber 40a is located on the rubber film 47 side of the piston part 49, and the second chamber 4a
Ob is located on the bottom 49B side. This liquid chamber 4
Zero is filled with a slow liquid, for example, oil such as silicon oil. The gas bag 48 is filled with a gas having a predetermined pressure, for example, air AR.

The gas chamber 45 includes the valve chamber 52 and the pressing chamber 4.
3, and both chambers 52, 43 are provided with side walls 57a of the base.
Through the communication hole 63.

The valve 70 is urged in the valve closing direction by a spring 71 interposed between the valve 70 and the bottom 49B of the cylinder portion 46.

The secondary outlet 61 of the accelerator 30 is
Although connected to the secondary pipe 32, the pipe 32
Is branched into an atmosphere opening pipe 33, a pressure pipe 34, and a pressure pipe 35.

The orifice 36 has an orifice 36
Is provided, and the pressure pipe 34 is connected to a pressure switch 37. The pressure pipe 35 is connected to the pressure chamber 18 of the release valve 1.
And the inside of the pressurizing chamber 18 is usually provided with the orifice 3.
Atmospheric pressure is maintained by the air entering from 6.

Next, the operation of this embodiment will be described. First, the time of fire monitoring will be described. Pneumatic P ₁₁ water pressure of the primary side of the release valve 1 P ₁₀ and its secondary side 6 is kept at a respectively predetermined pressure. The working pressure ratio P ₁₀ : P ₁₁ between the water pressure P ₁₀ and the air pressure P ₁₁ is usually 5: 1.
₁₀ = 14 kgf / cm ² , air pressure P ₁₁ = 2.8 kgf /
Although cm ^2, and in order to prevent the valve opening accidents caused by an impact or the like, a value exceeding the closing critical value 2.8 kgf / cm ^2, for example, is set to the air pressure P ₁₁ = 3.8kgf / cm ^2.

The water pressure receiving surface 2a and the air pressure receiving surface 6a of the valve body 15
Same area, i.e., a Paiesu _10, the water pressure receiving surface 2a takes pressure P _10, also the air pressure P ₁₁ is applied to an air pressure-receiving surface 6a. Therefore, a pressure of πS ₁₀ × P ₁₀ is applied to the water receiving surface 2a of the valve body 15 as a whole, and the water receiving surface 6a
Is applied with a pressure of πS ₁₀ × P ₁₁ as a whole, and πS ₁₀ ×
P ₁₀ > πS ₁₀ P ₁₁ .

At this time, a water pressure is applied to the piston portion 20 connected to the valve body 15 in a direction opposite to the hydraulic force applied to the hydraulic pressure receiving surface. Water pressure according to the piston portion 20, i.e., balancing pressure B is the area Paiesu ₂₀ × pressure P ₁₀ of the piston portion 20, is divided by the cancellation of the balance pressure,
The water pressure applied to the water receiving surface 2a of the valve body 15 is reduced. That is, the pressure actually applied to the water receiving surface 2a of the valve body 15 is πP ₁₀ (S ₁₀ -S ₂₀ ). Therefore, in order to keep the valve element 15 closed, the valve element 1
It suffices that the pressure of the air pressure receiving surface 6 is larger than πP ₁₀ (S ₁₀ −S ₂₀ ).

[0046] If further described, the valve closure condition _{πP 10 (S 10 -S 20)} ≦ πS a ₁₀ P _11, opens when this condition is lost. Operating pressure ratio between the pressure and the pressure is 5: from 1, the _{5P 11 × (S 10 -S 20} ) ≦ P 11 × S 10 4/5 × S 10 S 20. Therefore, the diameter S ₂₀ of the piston portion 20 is
If more than four-fifths the size of the diameter S ₁₀ of is, can without increasing as in the conventional example the valve body 15 satisfies the closed condition. Incidentally, since even without opening too large, the diameter D ₁₀ of the valve body 15 relative to the diameter D ₂₀ of the piston portion 20, the diameter D ₂₀ of the piston portion 20, the diameter D ₁₀ of the valve body 15 9 / 10
It is also necessary to:

[0047] Thus, the force that tries to open the valve element 15 generated by the primary pressure P ₁₀ is largely offset by the balancer BL, the secondary side in the low pressure air in the area of the conventional valve body 15 Can also be closed.

The gas chamber 45 on the primary side 31 of the accelerator 30 is filled with the compressed air K on the secondary side 6 of the opening valve 1.
The compressed air K presses the rubber film 47 toward the piston 49. Then, the silicon oil SO becomes the orifice 51
From the second chamber 40b of the piston part 49 through the first
And the piston portion 49 also moves to compress the gas bag 48, and the gas bag 48 is compressed until the oil SO has the same pressure as the secondary air, that is, the pressure of the compressed air K. Is compressed.

The valve 70 is closed by receiving a valve closing pressure due to the spring force of the spring 71 and the pressure of the compressed air K.

In the accelerator 30, when the pressure in the fluid chamber 45 decreases due to a seasonal temperature change or a slight gas leak, the gas bag 48 tends to inflate by the reduced pressure, so that the second chamber 40b The silicone oil flows through the orifice 51 of the piston portion 49 into the first chamber 40a. At this time, a force in the valve opening direction acts on the piston portion 49 and the valve 70, but the flow into the second chamber 40b is gradual, the amount is small, and the force is small, so that the valve closing pressure is overcome. Can not. Therefore, the valve 70 maintains the closed state.

The secondary side 44 of the accelerator 30 communicates with the pressurizing chamber 18 via pipes 32 and 35. The pressurizing chamber 18 is maintained at an atmospheric pressure via an orifice 36.

Next, the case when a fire occurs will be described. When the sprinkler head 7A opens due to the occurrence of a fire, the opening valve 1
Is discharged from the sprinkler head 7A, and the pressure of the compressed air on the secondary side 6 drops sharply as compared with the above-mentioned seasonal temperature change and minute gas leakage.

At this time, the gas chamber 45 of the accelerator 30
As shown in FIG. 5, the pressure of the liquid drops rapidly, and the gas bag 48 tends to inflate. As a result, the silicon oil SO passes through the orifice 51 from the second chamber 40 b to the first chamber 40.
Move to a.

However, since the silicon oil SO is viscous and cannot pass through the orifice 51 rapidly, the moving speed of the oil SO becomes slower than the inflation speed of the air bag 48 and cannot catch up. Therefore, the piston portion 46 is pushed up, and the valve 70 is pushed up by overcoming the valve closing pressure and is opened, so that the compressed air K on the secondary side 6 flows to the secondary side outlet 61, passes through the pressurizing pipe 35, and passes through. It flows into the pressurizing chamber 18 and presses the piston portion 20 toward the valve body 15. In addition,
The secondary pipe 32 communicates with the atmosphere opening pipe 33 through the orifice 36, and the compressed air K flowing from the outlet 61 by the orifice 36 has a small amount flowing out to the atmosphere opening pipe 33, and most of the compressed air K flows through the pressure pipe 35. Pressure pipe 3
Flow to 4. Therefore, the compressed air K can press the piston portion 20 as described above. The compressed air K flowing through the pressure pipe 34 activates a pressure switch 37, and the pressure switch 37 is connected to an alarm (not shown) or the pump 4 via a control panel (not shown). Sends a signal indicating that the valve has been opened and the water has flown, and performs an operation such as issuing an alarm or driving a pump.

Therefore, the opening valve 1 is forcibly opened in a state where the pressure on the secondary side does not decrease to the valve opening pressure, so that the fire extinguishing water W on the primary side 2 is discharged at an early stage of the fire. It can be supplied to the sprinkler head 7A on the secondary side 6.

Since the valve element 15 of the opening valve 1 is guided by the guide rod 21 at the time of opening and closing and slides in a direction orthogonal to the axis C, the contact position between the valve seat 16 and the sealing member 15a of the valve element 15 is determined. It will always be the same. Therefore, even if a seal mark is formed on the seal member 15a, the seal mark always contacts the valve seat 16, so that no seal leakage occurs.

[0057] When the opening valve 1 is opened is designed to slide by one third of the diameter D ₁₀ of the valve body 15. This is because if the valve body 15 slides by １ ／ of the diameter D ₁₀ , the same flow passage cross-sectional area as the communication port 11 having the diameter D ₁₀ can be secured, and the flow passage resistance is reduced. .

The cross-sectional area of the primary inlet 1A of the opening valve 1 is designed to be the same as the area of the water receiving surface of the valve body 15. The amount of flowing water is set to, for example, 2800 L / min for both the primary side 2 and the secondary side 6.

In the accelerator 30, the piston 49
Is disposed in the liquid chamber 40, so that the piston 4
The orifice 51 provided at 9 is isolated from the outside.
Therefore, the orifice 51 is not clogged by the inflow of dust or the like.

Since the fluid passing through the orifice 51 is silicon oil SO having high viscosity, the fluid can play a role even if the diameter of the orifice is somewhat large. Therefore, the production control of the diameter of the orifice is easier than in the case where the fluid is air.

[0061]

Another embodiment of the present invention will be described with reference to FIG. In this opening valve 1, the piston portion 20a and the valve body 15a
Are fixed to the guide rod 21a, and the guide rod 21a penetrates the piston portion 20a and the valve body 15a. Further, the guide rod 21a
Are slidably supported by guide support portions 22a and 22b provided on the primary side and the secondary side, respectively.

Hereinafter, the ends of the guide rods on the primary side and the secondary side will be described as 100a and 100b, respectively. A contact portion 101a is provided on the secondary side surface of the valve body 15a, and the contact portion 101a is provided when the opening valve 1 is opened.
1a abuts on the primary side end of the guide support 22b,
One end 100a of the piston portion 20a is a guide rod 21a.
At the end in the secondary direction.

Therefore, even if the accelerator 30 does not operate due to a failure or the like, the compressed air does not flow through the secondary pipe 32, and the compressed air K does not reach the pressure switch 37, the pressure from the pressurizing chamber 18a is reduced. Water flows in, and the pressure switch 37 can be operated via the pressure pipe 35 and the pressure pipe 34.

When it is no longer necessary to discharge water from the sprinkler head 7 due to fire suppression or the like, the pump 4 is stopped, and then one end 100b of the guide rod 21a is externally applied with a driving device or the like to thereby provide a valve body 15a. ,
The piston portion 20a can be returned to the original position, and the release valve 1 can be closed.

[0065]

Embodiment Still another embodiment of the present invention will be described. In the above embodiment, an example is shown in which the guide supporting portion 22 is used as the sliding guide means for slidably supporting the guide rod 21. However, the sliding guide means is not limited to this. May be provided at the inside of the main body 10 to guide the slide in the direction of the arrow A15 while being orthogonal to the axis C of the main body 10, and the piston portion 20 may be provided instead of using the slide guide means. Plural, for example, 2
The guide rod 21 may be slidably supported by these piston portions.

By adopting such a configuration, it is not necessary to adopt a water-tight structure as in the guide support portion 22 of each of the above embodiments, and it is possible to reduce the manufacturing cost and the risk of water leakage due to deterioration of the water-tight structure.

In each of the above embodiments, the pressure pipe 34 is connected to the pressure switch 37, and the guide rod 22 and the pressure switch 37 constitute the flowing water detecting means. However, the flowing water detecting means is not limited to this. A projection is provided on a portion of the guide rod 22 located outside the main body 10, and the release valve 1 is opened and the guide rod 21 slides, so that the projection comes into contact with the microswitch. The flowing water detecting means may be constituted by the rod 22, the projection, and the microswitch.

[0068]

As described above, the present invention has the following remarkable effects. (1) Since the piston section is provided in the liquid chamber and the orifice for communicating the first chamber and the second chamber is provided in the piston section, the orifice is isolated from the outside. for that reason,
Unlike the conventional example, the orifice does not become clogged with dust or the like.

(2) Since the liquid chamber is filled with a slow liquid such as silicone oil, a large fluid resistance is generated when the liquid passes through the orifice. Therefore, there is no problem even if the diameter of the orifice is not precisely formed, so that production management is easy. (3) Since the balancer connected to the valve body is provided in the pressurizing chamber communicating with the primary side of the valve body, the pressure applied to the water receiving surface of the valve body is largely canceled by the balancer. For this reason, the air pressure surface on the secondary side can be significantly reduced as compared with the conventional example, so that the size of the opening valve can be reduced.

(4) Since the sliding guide means is provided on the valve body,
At the time of opening and closing, it always moves on the same locus. Therefore, unlike the conventional example, the valve body and the washer always contact at the same position when the valve is closed, so that no seal leakage occurs.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an open valve according to the present invention.

FIG. 2 is a longitudinal sectional view showing a valve-open state of FIG.

FIG. 3 is a view showing a flowchart of a dry sprinkler fire extinguishing apparatus.

FIG. 4 is a longitudinal sectional view showing an accelerator of the present invention.

FIG. 5 is a longitudinal sectional view showing a valve opening state of FIG. 4;

FIG. 6 is a longitudinal sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Opening valve 2 Primary side 3 Main pipe 6 Secondary side 8 Piping 10 Main body 11 Communication port 15 Valve body 16 Valve seat 18 Pressurizing chamber 19 Cylinder part 20 Piston part 30 Accelerator 40 Liquid chamber 41 Body 43 Pressing chamber 45 Fluid chamber 46 Cylinder part 47 Diaphragm 48 Diaphragm 49 Piston part 51 Orifice 55 Drive spring 56 Atmospheric communication port 60 Primary inlet 61 Secondary outlet 63 Flow passage 64 Inlet 65 Valve seat 70 Valve

Claims (4)

[Claims] 1. A body having an inlet and an outlet, a liquid chamber fixed in the body and sealed with a liquid, a gas chamber communicating with the inlet and the outlet and surrounding the liquid chamber, and the outlet. An opening and closing valve, wherein the liquid chamber is connected to the bottomed cylinder portion whose opening end is closed by an elastic film, and the first cylinder portion is connected to the first valve portion. An accelerator, comprising: a piston portion that partitions a room into a second room; an orifice formed in the piston portion and communicating the two rooms; and a gas bag stored in the second room. . 2. The accelerator according to claim 1, wherein the valve is urged in a valve closing direction by a spring means. 3. A communication port for communicating a primary side and a secondary side of a main body, a valve element provided downstream of the communication port for opening and closing the communication port, and a valve element provided on the primary side and connected to the valve element. An opening valve having a pressurizing chamber for applying a forced valve opening force, an accelerator having a primary inlet connected to a secondary side of the opening valve and a secondary outlet communicating with the pressurizing chamber of the opening valve; A sprinkler fire extinguishing system comprising: a pressurizing chamber of the opening valve, a slidable balancer connected to the valve body and receiving a primary water pressure; and an accelerator having an inlet and an outlet. Having a body, a liquid chamber fixed in the body and sealed with a liquid, a gas chamber communicating with the inlet and the outlet, and surrounding the liquid chamber;
A valve for opening and closing the outlet, wherein the liquid chamber is closed by an elastic membrane, and a piston connected to the valve and separating the cylinder into a first chamber and a second chamber. And an orifice formed in the piston portion for communicating the two chambers, and a gas bag stored in the second chamber. 4. A communication port for communicating a primary side and a secondary side of a main body, a valve element provided downstream of the communication port for opening and closing the communication port, and a valve element provided on the primary side and connected to the valve element. An opening valve having a pressurizing chamber for applying a forced valve opening force, an accelerator having a primary inlet connected to a secondary side of the opening valve and a secondary outlet communicating with the pressurizing chamber of the opening valve; And a sprinkler fire extinguishing system comprising: a valve body of the opening valve includes sliding guide means; a pressurizing chamber connected to the valve body;
A slidable balancer for receiving water pressure on the primary side, wherein an accelerator communicates with the body having an inlet and an outlet, a liquid chamber fixed in the body and sealed with a liquid, and the inlet and the outlet, A gas chamber surrounding the liquid chamber;
A valve for opening and closing the outlet, wherein the liquid chamber is closed by an elastic membrane, and a piston connected to the valve and separating the cylinder into a first chamber and a second chamber. And an orifice formed in the piston portion for communicating the two chambers, and a gas bag stored in the second chamber.