JP2003316446A - Pressure regulating valve for fire-extinguishing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure regulating valve for fire-extinguishing equipment which can control the movement of a movable valve without using a spring. <P>SOLUTION: The pressure regulating valve 20 reduces the pressure of a high pressure fire-extinguishing gas which flows in from a gas inlet 24 and discharges the gas from a gas exhaust port 25 to the outside. The valve is provided with housings 21, 22, 23, a movable valve body 33, a piston 40, and a connecting rod 44. The housings 21, 22, 23 include a primary pressure chamber 37, a secondary pressure chamber 38, and a pressure sensing chamber 39. The movable valve body 33 opens/closes a channel between the primary pressure chamber 37 and the secondary pressure chamber 38. The piston 40 has a first pressure sensing face 1 facing the pressure sensing chamber 39, and a second pressure sensing face facing the secondary pressure chamber 38. The connecting rod 44 acts as intermediary for the piston 40 and the movable valve body 33 so that the piston 40 and the movable valve body 33 move in an interlocked manner. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulating valve attached to a container containing high pressure fire-extinguishing gas.

[0002]

2. Description of the Related Art This type of pressure control valve for fire extinguishing equipment normally has a gas passage closed, but in an emergency, the passage is opened to discharge the high-pressure fire extinguishing gas in the container to the outside. The high-pressure fire extinguishing gas that exits the pressure control valve is blown to the fire area via an external pipe.

A large amount of high-pressure gas storage containers are required in case of a fire in a building or the like, but it is desirable to make the installation space of the containers as small as possible. Therefore, a large amount of fire extinguishing gas is filled in the container at high pressure. Normally, the pressure of extinguishing gas in a container is 30
It is about MPa (about 300 Kg / cm ² ). On the other hand, the piping that guides the high-pressure fire-extinguishing gas that has exited the pressure regulating valve to the fire site does not have the strength to withstand such high pressure. Normally, the pipe can only withstand a strength of up to about 200 kg / cm ² . Therefore, it is necessary to reduce the gas pressure with the pressure control valve.

[0004] The pressure regulating valve and vacuum gas pressure of about 300 Kg / cm ² to about 150 Kg / cm ² for discharging the extinguishing gas. What is required as a pressure control valve is to reduce the gas pressure and to release all the fire-extinguishing gas in the container in the shortest possible time.

FIG. 1 shows a pressure regulating valve for a fire extinguishing facility disclosed in Japanese Utility Model Registration No. 3072106.
The illustrated pressure control valve 1 includes a housing 2 having a gas inlet 3 and a gas outlet 4, a sealing member 5, a spring 6, and
A gas chamber 7, a sealing plate 8, a valve seat member 9, a valve body 10,
A spring 11 and a lid member 12 having a hole 13 are provided.

The sealing member 5 is urged by the pressure of the gas filled in the gas chamber 7 and the spring 6 to close the flow path from the gas inlet 3 to the gas outlet 4. The sealing plate 8 blocks the flow between the gas chamber 7 and the outside world.

The valve body 10 is biased by a spring 11 so as to move away from the valve seat member 9. In the state shown in FIG. 1, the valve body 10 and the valve seat member 9 are separated from each other, and the flow path is open.

The operation of the pressure regulating valve 1 shown in FIG. 1 will be described. When the sealing by the sealing member 5 is released, the pressure regulating valve 1 allows the gas to flow therethrough and exhibits a depressurizing action. The sealing release by the sealing member 5 is performed as follows, for example. A needle or the like is inserted into the hole 13 of the lid member 12 from the outside to make a hole in the sealing plate 8. As a result, the atmospheric pressure of the gas chamber 7 decreases. Since the pressure of the flow passage on the gas inlet 3 side is high, the sealing member 5 is pushed back to the lid member 12 side with a pressure that overcomes the urging force of the spring 6, and opens the flow passage.

When the pressure of the flow passage on the gas discharge port 4 side rises due to the inflow of gas, the force for moving the valve body 10 changes due to the difference between the pressure receiving area on the discharge side and the pressure receiving area on the supply side in the valve body 10. Occurs, and a pressure acts to move the valve body 10 toward the valve seat member 9 against the biasing force of the spring 11. Due to this pressure, when the valve body 10 moves and comes into contact with the valve seat member 9, the flow path is closed, and the supply of gas to the flow path on the gas exhaust port 4 side is cut off. When the supply of gas is cut off, the pressure in the flow path on the gas outlet 4 side decreases, the pressure that presses the valve body 10 toward the valve seat member 9 decreases, and the spring 1
The urging force of 1 restores the valve element 10 to its original position and opens it. When the pressure in the flow path on the discharge port 4 side rises again due to the open state, the above operation is repeated. By repeating such reciprocating movement of the valve body 10, the gas pressure on the discharge side becomes lower than the gas pressure on the supply side.

[0010]

In the pressure regulating valve 1 as shown in FIG. 1, the pressure reduction control is performed by utilizing the spring force of the spring 11. The spring 11 requires a very large spring force to control the movement of the valve body 10 under the action of a very high gas pressure. Therefore, a very large spring is required, and the space for accommodating the spring becomes large, leading to an increase in the size of the entire valve.

An object of the present invention is to provide a pressure control valve for a fire extinguishing facility, which can control the movement of a movable valve body without using a spring.

Another object of the present invention is to enable the high pressure fire-extinguishing gas in the container to be discharged in a short time.

[0013]

SUMMARY OF THE INVENTION The present invention is a pressure control valve for a fire extinguishing facility that decompresses high-pressure fire extinguishing gas flowing in from a primary pressure side and discharges it to a secondary pressure side. A housing having a pressure receiving chamber, a movable valve body that opens and closes a flow path between the primary pressure chamber and the secondary pressure chamber, a first pressure receiving surface facing the pressure receiving chamber and a second pressure receiving surface facing the secondary pressure chamber. A piston and a connecting rod bridging the piston and the movable valve body are provided so as to interlock movements of the piston and the movable valve body.

According to the above construction, the movable valve body performs pressure reduction control while balancing using the pressure of the pressure receiving chamber given through the piston and the connecting rod, so that a spring for pressure reduction control is unnecessary. .

Preferably, the pressure control valve for fire extinguishing equipment has a pressure introducing passage for guiding the pressure of the primary pressure chamber to the pressure receiving chamber. This is efficient because the pressure of the primary pressure chamber can be used as the pressure source of the pressure receiving chamber. In this case, it is desirable to provide a check valve in the pressure introducing flow passage, which allows a pressure flow from the primary pressure chamber to the pressure receiving chamber but prohibits a pressure flow in the opposite direction. By providing the check valve, the pressure in the pressure receiving chamber becomes substantially constant, so that the fluctuation range of the gas pressure discharged from the pressure regulating valve can be reduced.

In one preferred embodiment, the pressure introducing passage is formed through the movable valve body, the connecting rod and the piston. In this case, it is desirable to dispose a check valve inside the piston that allows the flow of pressure from the primary pressure chamber to the pressure receiving chamber, but prohibits the flow of pressure in the opposite direction.

Preferably, the connecting rod is slidably received in at least one of the movable valve body and the piston. In this way, the connecting rod requires only the pushing force, so that it is not necessary to increase the strength of the connecting rod so much.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS.

The pressure regulating valve 20 shown in FIG. 2 includes a lower housing 21 connected to a container filled with a fire extinguishing gas,
It comprises a central housing 22 connected to the upper part of the lower housing 21 and an upper housing 23 which is connected to the upper part of the central housing 22 and serves as a ground nut. The lower housing 21 has a gas inlet 24 for receiving the extinguishing gas discharged from the extinguishing gas container, and the central housing 22 has a gas outlet 25 for delivering the extinguishing gas to an external pipe.

A sealing member 26 is provided in the lower housing 21.
And the movable valve element 33 is housed. Normally, the sealing member 26 is urged by the gas pressure in the gas chamber 29 and the spring 28 to come into contact with the upstream valve seat 27 of the lower housing 21 and close the flow path. The communication between the gas chamber 29 and the outside world is blocked by a sealing plate 30, and the sealing plate 30 is wrapped by a lid member 31 having a hole 32.

The movable valve element 33 is urged by a spring 35 supported by a spring receiving member 36 so as to come into contact with the downstream valve seat 34 of the central housing 22.

A cylinder chamber for slidably receiving the piston 40 is formed in the upper portion of the central housing 22 and in the upper housing 23. The piston 40 and the movable valve body 33 are operably connected via a connecting rod 44. Specifically, the upper end of the connecting rod 44 is slidably fitted in the piston 40, and the lower end of the connecting rod 44 is fitted in the movable valve body 33.

In the figure, when the piston 40 moves downward, the connecting rod 44 also moves downward and pushes the movable valve element 33 downward. Conversely, when the piston 40 moves upward, the connecting rod 44 also moves upward. The movable valve body 33 is pushed upward by being biased by the gas pressure and the spring 35. If the piston 40 and the movable valve body 33 slidably receive the end portion of the connecting rod 44 as in the illustrated embodiment, the connecting rod 44 needs only a pushing force. The strength of 44 need not be so high. Similar effects are achieved even if only one of the piston 40 and the movable valve body 33 slidably receives the connecting rod 44.

The movable valve element 33, the connecting rod 44, and the piston 40 are respectively provided at their centers with a small passage 33 penetrating therethrough.
a, 44a, 40a. These passages 33
Reference characters a, 44a, and 40a form a pressure introduction flow path.

A primary pressure chamber 37, a secondary pressure chamber 38 and a pressure receiving chamber 39 are formed in the housings 21, 22, 23. The movable valve body 33 opens and closes the flow path between the primary pressure chamber 37 and the secondary pressure chamber 38. The piston 40 has a first pressure receiving surface facing the pressure receiving chamber 39 and a second pressure receiving surface facing the secondary pressure chamber 38.

The pressure introducing passages 33a, 44a and 40a are
The pressure of the primary pressure chamber 37 is guided to the pressure receiving chamber 39. Preferably,
A check valve that allows the flow of pressure from the primary pressure chamber 37 to the pressure receiving chamber 39 but prohibits the flow in the opposite direction is provided in this pressure introduction path. In the illustrated embodiment, the piston 4
A check valve is provided in 0. The check valve is a valve seat member 45.
And a ball 41 located on the valve seat member, and a ball 41
Seat ring 43 positioned above the seat ring 4 and seat ring 4
3 and the ball 41, and a spring 42 that urges the ball 41 to contact the valve seat member 45.

Next, the operation of the pressure regulating valve 20 shown in FIG. 2 will be described. When a fire occurs, a hole is made in the sealing plate 30 to release the pressure in the gas chamber 29 to the outside. Gas chamber 29
As the pressure is reduced, the urging force acting on the sealing member 26 is weakened, so that the sealing member 26 moves to the right in the figure by the pressure of the flow passage on the gas inlet 24 side to open the flow passage.

The pressure of the high-pressure fire-extinguishing gas flowing into the primary pressure chamber 37 is introduced into the pressure receiving chamber 39 via the pressure introducing passages 33a, 44a, 40a. When the pressure receiving chamber 39 has a high pressure equal to or higher than a predetermined value, the pressure pushes the piston 40 downward. Since the downward movement of the piston 40 is imparted to the movable valve body 33 via the connecting rod 44, the movable valve body 33 moves downward and opens the flow path. As a result, the high-pressure fire extinguishing gas in the primary pressure chamber 37 flows into the secondary pressure chamber 38 and is discharged to the external pipe via the gas discharge port 25.

Three pressures act on the movable valve element 33. The first pressure is the pressure in the primary pressure chamber 37. The second pressure is the pressure in the secondary pressure chamber 38. The third pressure is the pressure in the pressure receiving chamber 39 given through the connecting rod 44. By the balance of these pressures, the movable valve element 33 opens and closes the flow path. As a result, the high-pressure fire extinguishing gas passing through the movable valve body 33 is decompressed and discharged from the gas discharge port 25. Since the spring force of the spring 35 is considerably smaller than the pressure of the high-pressure fire extinguishing gas, the movable valve body 3
It does not affect the pressure reducing operation of No. 3.

The depressurizing operation of the pressure regulating valve 20 will be described in more detail with reference to FIG. The definition of the symbol in FIG. 3 is
It is as follows.

[0031] P _0: pressure P of the pressure receiving chamber 39 _1: pressure in the primary pressure chamber 37 P _2: pressure of the secondary pressure chamber 38 S _1: pressure-receiving area S ₀ of the movable valve body 33: the piston facing the pressure receiving chamber 39 side Pressure receiving area S _{2 of} 40: In the pressure adjustment of the pressure receiving area pressure of the piston 40 facing the secondary pressure chamber 38 side, the relationship between the pressure receiving area and the pressure is as follows.

(P ₂ × S ₂ ) = (P ₀ × S ₀ )-{(P
₁₋ P ₂ ) × S ₁ } That is, the following relationship is established.

(S ₂ −S ₁ ) P ₂ = (P ₀ × S ₀ ) −
(P ₁ × S ₁ ) In the embodiment of the present invention, the initial primary side pressure (container pressure) acts on the movable valve element 33. The magnitude of this pressure is (P ₀ × S ₀ ) generated by the pressure receiving chamber 39. Since the pressure fluctuation in the pressure receiving chamber 39 is small, the secondary pressure (P ₂ ) increases as the primary pressure (P ₁ ) decreases.

Therefore, the pressure receiving area of the piston 40 under the condition of the secondary pressure set value such that the internal pressure (P ₁ ) decreases and the primary pressure (P ₁ ) = secondary pressure (P ₂ ) S
₂ / S ₀ ), the secondary pressure (P ₂ ) will not exceed the set value, no matter how much the primary pressure (P ₁ ) is.

Therefore, if P ₁ = P ₂ = secondary side pressure set value, (S ₂ / S ₀ ) = (P ₀ / secondary side pressure set value) from the above equation. Here, P ₀ is the maximum filling pressure (for example, 30.
(0 MPa) is sealed in the pressure receiving chamber 39, the piston 4
It is the pressure when compressed and pressurized by the movement of 0.

Next, the relationship between the pressure receiving area and the pressure will be described by showing specific numerical values. The maximum filling pressure (primary side maximum pressure) of the high-pressure fire extinguishing gas container is 30.0 MPa (306 kgf
/ Cm ² ), the secondary side pressure setting value (maximum value) is 16.7M
Pa (170 kgf / cm ² )

First, the pressure receiving area of the piston is calculated. _{(S 2 / S 0) =} (P 0 / secondary side pressure set value) = 360
/170=2.118 S ₁ = 1.54 cm ² (diameter 14 mm), S ₂ = 8.0
When 4 cm ² (diameter _{32mm), S 0 = S 2} /2.
Since it is 118, S ₀ = 3.80 cm ² (diameter 22 m
m). Next, the fluctuation of the secondary side pressure P ₂ due to the fluctuation of the container internal pressure P ₁ is obtained.

From the above equation, the following relationship is obtained. When P ₁ = 30.0 MPa (306 kgf / cm ² ),
P ₂ = 138 kgf / cm ² .

P ₁ = 25.0 MPa (255 kgf / c
m ² ), P ₂ = 150 kgf / cm ² .

P ₁ = 20.0 MPa (204 kgf / c
When m ² ), P ₂ = 162 kgf / cm ² .

P ₁ = 16.7 MPa (170 kgf / c
When m ² ), P ₂ = 170 kgf / cm ² .

As is clear from the above values, the secondary pressure (P ₂ ) rises as the primary pressure (P ₁ ) decreases, so the high-pressure fire-extinguishing gas in the container must be released in a short time. You can

Although one embodiment of the present invention has been exemplarily described with reference to FIGS. 2 and 3, the present invention is not limited to the illustrated structure. Various modifications and variations can be made within the substantially same range as the present invention. Some of them are listed below as an example. (1) In the illustrated embodiment, the pressure introducing flow path for guiding the pressure of the primary pressure chamber to the pressure receiving chamber is provided so as to penetrate the movable valve body, the connecting rod, and the piston, but as another example,
It is possible to provide the pressure introduction flow path in the housing. (2) If the pressure inside the pressure receiving chamber can be maintained at a high pressure in advance, it is not necessary to provide a pressure introduction flow path. (3) If a check valve is provided in the pressure introducing passage, the fluctuation range of the discharged gas pressure can be reduced, but if the fluctuation range of the gas pressure can be tolerated to a certain degree, the check valve can be reversed. The stop valve may be omitted. (4) In the illustrated embodiment, the connecting rod is slidably received by both the movable valve body and the piston, but one end of the connecting rod is fixed to the movable valve body or the piston and the other end is slidable. You may comprise. Alternatively, if the strength of the connecting rod is sufficiently large, both ends of the connecting rod may be fixed to the movable valve body and the piston.

[Brief description of drawings]

FIG. 1 is a sectional view showing a pressure regulating valve for a fire extinguishing facility disclosed in Utility Model Registration No. 3072106.

FIG. 2 is a sectional view showing an embodiment of the present invention.

FIG. 3 is a diagram schematically showing a main part of an embodiment of the present invention.

[Explanation of symbols]

20 pressure regulating valve, 21 lower housing, 22 central housing, 23 upper housing, 24 gas inlet,
25 gas discharge port, 26 sealing member, 27 upstream valve seat, 28 spring, 29 gas chamber, 30 sealing plate, 31
Lid member, 32 holes, 33 movable valve body, 34 downstream valve seat, 35 spring, 36 spring receiving member, 37 primary pressure chamber,
38 secondary pressure chamber, 39 pressure receiving chamber, 40 piston, 41
Ball, 42 spring, 43 seat ring, 44 connecting rod, 45 valve seat member, 33a, 44a, 40a
Pressure introduction flow path.

Claims (6)

[Claims] 1. A pressure regulating valve for decompressing high-pressure fire extinguishing gas flowing in from a primary pressure side and discharging it to a secondary pressure side, the housing having a primary pressure chamber, a secondary pressure chamber and a pressure receiving chamber, and the primary pressure chamber. A movable valve body that opens and closes a flow path between the pressure chamber and the secondary pressure chamber; a piston having a first pressure receiving surface facing the pressure receiving chamber and a second pressure receiving surface facing the secondary pressure chamber; A pressure control valve for a fire extinguishing facility, comprising a connecting rod bridging the piston and the movable valve body so as to interlock the movement of the movable valve body. 2. The pressure control valve for fire-extinguishing equipment according to claim 1, further comprising a pressure introducing flow path for guiding the pressure of the primary pressure chamber to the pressure receiving chamber. 3. A check valve is provided in the pressure introducing flow passage, which allows a pressure flow from the primary pressure chamber to the pressure receiving chamber but prohibits a pressure flow in the opposite direction.
The pressure regulating valve for fire extinguishing equipment according to claim 2. 4. The pressure control valve for fire-extinguishing equipment according to claim 2, wherein the pressure introduction flow passage is formed through the movable valve body, the connecting rod and the piston. 5. A check valve is arranged inside the piston to allow a pressure flow from the primary pressure chamber to the pressure receiving chamber, but to prohibit a pressure flow in the opposite direction.
The pressure regulating valve for fire extinguishing equipment according to claim 4. 6. The pressure control valve for fire-extinguishing equipment according to claim 1, wherein the connecting rod is slidably received in at least one of the movable valve body and the piston.