JPH0536444Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a valve mechanism for a pressure accumulator vessel, and in particular to a valve mechanism for a pressure accumulator vessel that can prevent leakage of pressurized liquid from piping, etc. be.

[Conventional technology]

In conventional pressure accumulation type fire extinguishing equipment and sprinkler fire extinguishing equipment, the pressure accumulation container stores liquid extinguishing agent together with compressed gas, and the space for the extinguishing agent in the pressure accumulation container is transferred to piping and heat-sensitive parts of terminals through siphon pipes. It's communicating. Therefore, these pipes, etc. are always filled with extinguishing agent.

[The problem that the idea aims to solve]

For this reason, in conventional devices, piping connections may loosen due to vibration or the like, creating gaps, and the high-pressure fire extinguishing agent inside may leak out from the gaps, contaminating the surrounding area. Furthermore, in the harsh winter months, the liquid may freeze inside the pipes, potentially damaging the pipes.

In addition, due to the aforementioned loosening, etc., the pressure of the compressed gas inside the pressure accumulator decreases, and liquid may not be supplied when it is actually required. Detection requires expensive pressure gauges, pressure switches, etc.

Japanese Patent Laid-Open No. 57-153672 discloses that in a fire extinguishing agent storage container that discharges the pressurized extinguishing agent inside the container outside through a siphon tube in the event of a fire, the agent pressurizing gas injected into the storage container is A structure is disclosed in which the pressure inside and outside the siphon tube is equalized by providing a ventilation path that allows communication between the inside and outside of the siphon tube, thereby preventing minute leakage of extinguishing agent to the outside of the storage container. However, this structure simply has the function of eliminating the pressure difference between the inside and outside of the siphon tube.

The purpose of this invention is to prevent liquid from leaking from pipe connections due to loosening, etc., or from freezing and damaging the pipes, and to prevent liquid from leaking from pipe connections due to loosening, etc., and to prevent liquid from being damaged by pressure accumulation containers when liquid is actually needed. It is an object of the present invention to provide a valve mechanism for a pressure accumulator vessel that ensures that the liquid within the vessel is supplied without any hindrance.

[Means to solve the problem]

The device according to this invention includes a pressure accumulating container that stores compressed gas and liquid in a vertically separated manner, a closing member that closes the upper opening of the pressure accumulating container, and a closing member that is formed within the closing member and communicates with the liquid supply pipe. a valve chamber, a siphon pipe that reaches the liquid space of the pressure accumulator at the lower end and communicates with the valve chamber at the upper end, a small diameter section that receives the pressure of the siphon pipe, and a large diameter section that receives the pressure of the valve chamber and has a larger cross-sectional area than the small diameter section. a valve body disposed in the valve chamber so as to be displaceable in the axial direction and controlling communication between the siphon pipe and the liquid feeding pipe; A valve stem extending to the outside of the closing member, a compression coil spring biasing the valve body in the opening direction via the valve stem, and a space for compressed gas in the pressure accumulator formed in the closing member. and an orifice passage communicating with the valve chamber.

[Effect]

When the liquid in the pressure accumulator is not required to be supplied, the valve chamber covered by the closing member is in a sealed state from the outside space, and the valve chamber is closed to the pressure in the pressure accumulator via the orifice passage. It communicates with the gas space and is maintained at the same pressure as the compressed gas. Therefore, the pressure on the siphon pipe side and the pressure of the compressed gas are applied to the small diameter part and large diameter part of the valve body, respectively.
In other words, the same pressure is applied to each other.

A valve stem is attached to the large diameter portion of the valve body and passes through the closing member in an air-water-tight manner, and a compression coil spring is disposed to bias the valve stem upward. At a pressure higher than a predetermined pressure, the downward force due to the pressure acting on the large and small diameter portions of the valve body becomes greater than the upward biasing force of the compression coil spring, causing the valve stem to displace at its lowest point. do not. At a pressure below a predetermined pressure, the downward force due to the pressure on the valve element decreases, and the valve stem is displaced upward to balance this force.

When it is necessary to supply the liquid in the pressure accumulator, such as in the event of a fire, the internal space of the liquid supply pipe is largely opened to the external space at its downstream end, and the orifice Since a small amount of compressed gas is supplied from the compressed gas space in the pressure accumulator to the valve chamber via the passage, the pressure in the internal space of the liquid supply pipe and the valve chamber quickly decreases to a predetermined value or less. As a result, the force acting on the small diameter portion of the valve body from the siphon pipe side becomes larger than the force acting on the large diameter portion of the valve body, and the valve body moves toward the large diameter portion. As a result, the siphon pipe and the liquid sending pipe are brought into a connected state, and the liquid in the pressure accumulator receives high pressure from the compressed gas in the pressure accumulating container and flows out into the liquid sending pipe.

〔Example〕

This invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a block diagram of the main parts of a fire extinguishing system to which this invention is applied. Bomb-shaped drug container 10
The container body 12 includes a container body 12 and a cylindrical connecting portion 14 which is fixed to the upper end of the container body 12 by welding and communicates between the inside and outside of the container body 12. Closure member 1
6 has a cylindrical valve chamber 18 formed therein, and its lower end flange is placed against the upper end surface of the cylindrical connecting portion 14 . The cap 20 is fitted into the joint between the cylindrical connecting part 14 and the closing member 16, and is screwed into the threaded groove 22 on the outer peripheral surface of the cylindrical connecting part 14 at the lower end of the inner circumference, and at the same time at the upper end. The flange at the lower end of the closure member 16 is connected to the cylindrical connecting portion 14 by an inwardly projecting edge.
Pressing and pinching. The O-ring 24 is fitted into a tapered portion on the outer peripheral side of the upper end of the cylindrical connection portion 14,
Airtightness is maintained at the joint between the cylindrical connecting portion 14 and the closing member 16. The inside of the chemical container 10 is filled with a liquid extinguishing agent 26 on the lower side, and a compressed gas 28 consisting of compressed air, compressed nitrogen gas, etc. is filled on the upper side.

The connecting member 30 is screwed into the inner periphery of the lower end of the closing member 16 via a thread groove 32 on the outer periphery of the upper end, and the upper end surface of the connecting member 30 functions as a contact surface 34 . The O-ring 36 is disposed at the joint between the closing member 16 and the connecting member 30, and maintains airtightness and liquidtightness at that point. The siphon tube 38 is deeply inserted into the liquid extinguishing agent 26 within the container body 12 at its lower end (not shown) and is inserted deep into the liquid extinguishing agent 26 within the container body 12 .
The connecting member 30 reaches near the bottom surface of the connecting member 30 and is screwed into a stepped portion on the inner circumference of the connecting member 30 at the thread groove 40 at the upper end. Valve body 4
2 includes a small diameter portion 44 that is slidable on the upper end of the inner circumference of the connecting member 30, and a large diameter portion 4 that is slidable on the circumferential surface of the valve chamber 18 and has a larger cross-sectional area than the small diameter portion 44.
6, and is disposed within the valve chamber 18. The lower surface of the large diameter portion 46 can come into contact with the contact surface 34 of the connecting member 30 . The O-rings 48 and 50 are fitted into annular grooves on the circumferential surfaces of the small-diameter portion 44 and the large-diameter portion 46, respectively. The liquid-tightness and airtightness of the circumferential surface of 16 are maintained.

The pore 52 as an orifice passage is connected to the closing member 16.
formed into a drug container 10 at each end.
open to the compressed gas space 28 and the valve chamber 18 in the
It connects the two with each other.

The valve stem 54 is connected to the large diameter portion 4 of the valve body 42 at its lower end.
The closing member 16 is fixed to the central part of the closing member 16 by screwing.
It slidably passes through the end face portion of and reaches the outside of the closing member 16 at the upper end. The O-ring 56 is
The valve rod 54 is fitted into an annular groove on the circumferential surface of the through hole of the closing member 16 through which the valve rod 54 passes, and maintains airtightness and liquid tightness at the sliding portion between the through hole and the valve rod 54.
The spring seat 58 is fixed to the circumferential surface of the upper end of the valve stem 54 , and the compression coil spring 60 is fitted onto the valve stem 54 and compressed between the upper surface of the closing member 16 and the spring seat 58 .

The outflow port 61 is formed in the side wall of the closing member 16 and opens to the peripheral surface of the valve chamber 18 . Liquid feed pipe line 6
2 is connected at one end to an outlet 61 and communicates with the valve chamber 18 via the outlet 61. The sensing nozzle 64 is connected to the other end of the liquid supply pipe 62 and the flame 6
It is melted and opened by the heat of step 6. Sensing nozzle 6
4 may be a sprinkler head or the like.

A charging valve 68 as a type of check valve is connected to the container body 1.
It is arranged on the side of the upper end of 2. The pressure charging valve 68 is
A cylindrical valve seat member 70 is fixed to the wall of the container body 12 and communicates between the inside and outside of the container body 12. The valve body 72 includes a valve body 72 that can be seated on a shaped valve seat member 70. The stopper 74 is provided to protrude from the inner periphery of the cylindrical valve seat member 70 and comes into contact with a portion of the valve body 72 to prevent the valve body 72 from coming off from the cylindrical valve seat member 70 . The cap 76 is a cylindrical valve seat member 70
screw onto the outer end of the

The upper cover 78 is disposed above the closure member 16 and is fixed to the upper surface of the closure member 16 at its lower end with a plurality of screws 80. Safety plug 82
is inserted into the upper cover 78 in a diametrically removable manner and can come into contact with the upper end of the valve stem 54 . Second
The figure shows the top cover 78 of FIG. 1 from the outside.
The position number 8 is visible. In addition, scales 86a and 86b are written on the upper cover 78,
The displacement of the spring seat 58 can be determined by scales 86a and 86b.

The operation of the embodiment will be explained.

Before a fire occurs, the sensing nozzle 64 is in a sealed state, so that the valve chamber 18 and the liquid supply line 62 are in a sealed state from the atmospheric pressure space outside the drug container 10. The valve chamber 18 communicates with the compressed gas 28 filling space in the drug container 10 through the pore 52, and the valve chamber 18 communicates with the compressed gas 28 filling space in the drug container 10.
8, which is equal to the pressure of the liquid extinguishing agent 26 in the drug container 10 and the pressure in the siphon tube 38. In this way, the valve body 42 has a small diameter portion 4.
4 and the large diameter portion 46 (this force is generated by the compression coil spring 60
This force is larger than the urging force in the opening direction of the valve body 42 due to the force. ), the large diameter portion 46 of the valve body 42 is located below the outlet 61 and is pressed toward the contact surface 34 of the connecting member 30. Therefore, the siphon pipe 38 and the liquid supply pipe line 62 are in a disconnected state, and the valve chamber 18 and the liquid supply pipe line 62 are in a disconnected state.
The interior is filled with compressed gas 28 without liquid extinguishing agent 26.

When there is no fire, the liquid supply pipe 62 is in a sealed state, and there is no gap in the pipes such as the liquid supply pipe 62 that communicates the inside and outside, the inside of the valve chamber 18 is the same as that in the drug container 10. at a pressure equal to the compressed gas 28;
The force urging the valve body 42 in the closing direction is large, and the lower surface of the valve body 42 is pressed against the contact surface 34 of the connecting member 30, that is, the valve body 42 is at the lowest position, and the valve stem 54 is pressed against the contact surface 34 of the connecting member 30. The spring seat 58 fixed to the upper end has a scale 86b (second
It is located in the position shown in the figure).

However, before a fire occurs, if the pipes such as the liquid supply pipe 62 become loose and the inside and outside of the pipe are communicated through a small gap, the inside of the valve chamber 18 and the liquid supply pipe 62 may be leaked from that gap. The compressed gas 28 leaks to the outside, and the pressure inside the valve chamber 18 decreases a little due to the leakage. The compressed gas 28 is supplied to the valve chamber 18 through the pore 52 provided in the closing member 16, so that the pressure acting on the small diameter portion 44 and the large diameter portion 46 of the valve body 42 decreases, and the pressure acting on the small diameter portion 44 and the large diameter portion 46 of the valve body 42 decreases. The difference between the force pushing the valve body 42 downward and the force pushing it upward becomes small, and therefore, the force applied to the small diameter portion 44 of the valve body 42 in the closing direction decreases, so that the valve body 42
rises in accordance with the biasing force of the compression coil spring 60 in a range where the upper surface of the large diameter portion 46 is below the outlet 61. Note that the safety stopper 82 is connected to the drug container 10.
After the liquid extinguishing agent 26 and the compressed gas 28 are filled, the upper cover 78 is removed in advance, so that the displacement of the valve element 42 in the opening direction is not obstructed. The biasing force of the compression coil spring 60 decreases as the compression coil spring 60 stretches, so the compression coil spring 6
The valve body 42, the valve stem 54, and the spring seat 58 rise until the biasing force of 0 balances the force acting on the upper and lower surfaces of the valve body 42 due to the reduced pressure in the valve chamber 18. In this way, the pressure inside the valve chamber 18 from the position of the spring seat 58,
In other words, it is possible to determine whether there is a gap between pipes or the like. When the spring seat 58 rises to the scale 86a in FIG. 2, it is determined that high pressure replenishment into the drug container 10 is necessary.

When a fire occurs and the sensing nozzle 64 is unsealed by the heat of the flame 66, the liquid supply pipe 62 becomes largely open to the atmospheric pressure space. On the other hand, since the pores 52 are narrow, it takes time to replenish the pressure of the compressed gas 28 to the valve chamber 18, and the pressure in the valve chamber 18 decreases to approximately atmospheric pressure. As a result, the large diameter portion 46 of the valve body 42
The force applied from the valve chamber 18 side is reduced, and the valve body 42
is raised by the force applied from the siphon pipe 38 side, and the lower surface of the large diameter portion 46 is located above the outlet 61. In this way, the siphon pipe 38 and the outlet 61
The liquid extinguishing agent 26 in the chemical container 10 is in communication with the
is force-fed to the sensing nozzle 64 via the siphon pipe 38 and the liquid-feeding line 62, and is ejected from the sensing nozzle 64.

When the liquid fire extinguishing agent 26 in the chemical container 10 is consumed and the liquid fire extinguishing agent 26 and compressed gas 28 are to be filled into the chemical container 10 again, the liquid fire extinguishing agent 26 is first filled into the chemical container 10 . Next, the valve body 42 is pushed downward via the valve stem 54, and the safety plug 82 is inserted into the upper cover 78. Upper cover 7
When the safety plug 82 is inserted into the valve 8, the upper end of the valve stem 54 comes into contact with the safety plug 82, so that the valve stem 54 cannot be displaced upward. After confirming that the safety plug 82 is inserted into the upper cover 78, the compressed gas 28 is filled into the medicine container 10 via the pressure filling valve 68 as a check valve. After the valve chamber 18 is filled with the compressed gas 28 through the pore 52, the safety plug 82 is removed from the upper cover 78.

[Effect of idea]

As described above, according to this invention, a valve body is disposed so as to be displaceable in the axial direction in the valve chamber serving as a connection between the siphon pipe and the liquid sending pipe, and the valve body receives pressure from the siphon pipe side. It has a small diameter part and a large diameter part that receives pressure supplied from the compressed gas space in the pressure accumulator through a small hole or orifice passage, and this applies equal pressure to the upper and lower surfaces of the valve body, and this Due to the area difference between the upper and lower surfaces, a downward force is generated on the valve body, and as a result, when there is no need to supply liquid in the pressure accumulator, the force that urges the valve body in the closing direction is reduced to the opening direction. Even better, since the connection between the siphon pipe and the liquid supply pipe is cut off, the inside of the liquid supply pipe is kept free of liquid. As a result, even if a pipe connection becomes loose and a gap is created, the compressed gas will only leak out from the gap, and the liquid will not leak out from the gap, preventing the leaked liquid from contaminating the surrounding area. be able to. Furthermore, it is possible to avoid freezing of the liquid in the piping during the harsh winter season, and to prevent damage to the piping due to freezing of the liquid.

In addition, in this device, the compression coil spring biases the valve body with an appropriate force in the direction in which the valve body opens via the valve stem fixed to the valve body, and when the pressure inside the valve chamber weakens, The valve stem is displaced until the compression coil spring stretches and its compression force is reduced enough to balance the resultant force of the forces acting on the upper and lower surfaces of the valve body. Therefore, if the compressed gas in the piping leaks from a gap caused by loosening of the piping, etc., the force applied to the large diameter side of the valve body decreases,
Since the valve stem is displaced, it is possible to detect the presence or absence of a gap at a pipe connection, etc. from the displacement of the valve stem without using an expensive pressure gauge, and when liquid is discharged, the compression coil spring The repulsive force also provides the effect of quickly establishing communication between the siphon pipe and the liquid feeding pipe.

[Brief explanation of the drawing]

The drawings relate to an embodiment of this invention; FIG. 1 is a block diagram of the main parts of a fire extinguishing system to which this invention is applied, and FIG. 2 is a view showing the top cover of FIG. 1 from the outside. 10... Drug container (pressure accumulation container), 16... Closing member, 18... Valve chamber, 26... Liquid extinguishing agent (liquid), 28... Compressed gas, 38... Siphon pipe,
42... Valve body, 44... Small diameter portion, 46... Large diameter portion, 52... Small hole (orifice path), 54... Valve stem, 60... Pressure coil spring, 62... Liquid sending pipe line.

Claims (1)

[Scope of utility model registration request] A pressure accumulator container that stores compressed gas and liquid in a vertically separated manner, a closing member that closes the upper opening of the pressure accumulator, a valve chamber formed within the closing member that communicates with the liquid supply pipe, and a lower end thereof. a siphon pipe that reaches the liquid space of the pressure accumulator and communicates with the valve chamber at its upper end; a small diameter portion that receives pressure from the siphon pipe; and a large diameter portion that receives pressure from the valve chamber and has a larger cross-sectional area than the small diameter portion. a valve body disposed in the valve chamber so as to be displaceable in the axial direction and controlling communication between the siphon pipe and the liquid feeding pipe; and a compression coil spring that biases the valve body in the opening direction via the valve stem, and a compression coil spring formed in the closure member that compresses the pressure inside the pressure accumulator. A valve mechanism for a pressure accumulator container, comprising an orifice passage that communicates a gas space with the valve chamber.