JPH0336721Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a safety device for an accumulator, and more specifically, a safety device for an accumulator that can automatically discharge high-pressure gas built into the accumulator in the event of an emergency heating such as a fire. Regarding.

[Conventional technology]

The internal chambers of the pressure-resistant cell are partitioned by bladders made of rubber-like elastic material, and one chamber is filled with high-pressure gas, and the other chamber is connected to the pressure piping system. In an accumulator that absorbs pressure fluctuations by compressing high-pressure gas, it is necessary to provide some means for urgently discharging the internal high-pressure gas in the event of an accident such as a fire. Figure 3 shows an example of this type of safety device disclosed in Japanese Utility Model Application Publication No. 55-6599, in which a stepped portion is provided in the gas injection hole b provided in the center of the gas valve case a, and the valve seat c is The valve body e, which is formed and pressed toward the valve seat c side by a spring d and forms a check valve together with the valve seat c, has a hollow part, and the hollow part is made of a fusible material made of a material that melts at high temperature. f is filled and the accumulator is exposed to high temperatures, the fusible material f melts and the high pressure gas inside the accumulator is discharged to the outside through the hollow part of the valve body e.

[Problem that the invention attempts to solve]

However, in this example, since the fusible material f is constantly in contact with the high-pressure gas in the accumulator, it is directly affected by heat due to adiabatic compression of the high-pressure gas that accompanies the operation of the accumulator.
There is a risk that the fusible material f may melt and high-pressure gas is ejected even when it is not necessary, and also because the upper end of the fusible material f is in contact with the valve seat c to form a seal against the high-pressure gas under normal conditions. , the fusible material f is exposed to the pressure of the spring d and the high-pressure gas and the heating caused by the high-pressure gas, causing creep and sagging phenomenon, which may eventually lead to failure of sealing. For this purpose, a blind lid g is attached to the gas valve case a to prevent high pressure gas from spouting out other than when necessary, and
A fusible material h is inserted into this blind lid g, so that when an accident such as a fire occurs, high pressure gas is discharged by melting the fusible material h. However, even with this configuration, if the fusible material f melts or a sagging phenomenon occurs in the fusible material f, the fusible material h of the blind lid g will come into direct contact with the high-pressure gas, so the heating by this high-pressure gas There is a risk that the fusible material h will melt and high-pressure gas will blow out at times other than when necessary. Moreover, if the fusible material f is in a normal state, the high-pressure gas cannot be discharged unless both the fusible material f and the fusible material h are melted, so the high-pressure gas can be discharged quickly and reliably in the event of a fire, etc. cannot be expected.

Therefore, the purpose of the present invention is to provide a safety device for an accumulator that can prevent high-pressure gas from spewing out other than when necessary, and can quickly and reliably discharge high-pressure gas in the event of a fire or the like. shall be.

[Means for solving problems]

The present invention was created in view of the above-mentioned problems, and the technical means for solving the problems are configured as follows. That is, a check valve core is provided with a valve rod protruding toward the outside of the cell that partitions a gas injection hole in the cell that communicates with the outside, and opens and closes the gas injection hole, and the check valve core is connected to the gas injection hole formed outside the check valve core. It has a piston member which is movably disposed in the cylinder chamber and supported by a fuse member which melts at high temperature and which is disposed on the check valve core side, and which is pressed against the fuse member by a spring means, and when the fuse member melts, The piston member moves and presses the valve stem of the check valve core, causing the fluid inside the cell to flow out.

[Effect]

In this invention, a piston member is inserted into the cylinder chamber of the cap body, and a fuse member that melts at high temperature is interposed between the piston member and the bottom wall of the cylinder chamber, so that the piston member does not move downward under normal conditions. is regulated and the check valve core is in the closed state. Moreover, since the fuse member is disposed outside the check valve core, it does not come into direct contact with the high pressure gas, and therefore will not be heated by the high pressure gas and melted other than when necessary.
Since the piston member is pressed downward by the spring means, if a fire or the like occurs and the fuse member melts, the piston member moves downward quickly and reliably, and is mounted on the bottom wall of the cylinder chamber. Press the rod through the provided communication hole to open the check valve core.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIG. 1. Reference numeral 1 denotes an accumulator cell in which a check valve core 3 is inserted into a gas injection hole 2;
An annular projection 1a having a male threaded portion for attaching a cap body 4, which will be described later, is integrally formed around the opening of the gas injection hole 2 on the outer surface of the cell 1. The outer shape of the check valve core 3 has a main body and a valve stem, and the outer shape of the main body is cylindrical and has a threaded portion on the upper end side, and is cut in a D shape from the threaded portion in the inner diameter direction to form a passage that opens laterally. are doing. Further, a conical tube is formed below the cylindrical portion. A valve stem is movably arranged on the inner circumferential surface of the main body and has a part that protrudes upward from the main body and also protrudes downward, and a cylindrical part is integrally connected to this protruding part below the tip of the conical part. are doing. The cylindrical portion is provided with a valve seat made of rubber material that opens and closes the valve with the tip of the conical tube of the main body.

Inside the main body (not shown) of the check valve core 3, one end is supported by the main body, and a spring whose other end is connected to the valve stem resiliently presses the valve stem upward. When this valve stem is pushed downward by an external force, the tip of the conical cylinder and the cylindrical part of the main body open the valve, and the fluid below the check valve core passes through the passage between the inner peripheral surface of the main body and the valve stem to the upper end. It can drain into a laterally open channel on the side. The cap body 4 has recesses 5 and 6 that are open on the upper and lower end surfaces, and a communication hole 8 is formed in the center of a bottom wall 7 that partitions both the recesses 5 and 6, and a female hole is formed in the inner peripheral surface of the recess 6 on the lower end side. A threaded portion is carved to serve as a mounting portion for the annular projection 1a. A lid member 9 having a through hole 10 is inserted and screwed into the recess 5 on the other upper end side, and a cylinder chamber 1 is inserted between the lid member 9 and the bottom wall 7.
1 is configured. Reference numeral 12 denotes a piston member inserted into the cylinder chamber 11, which has a flange 12a around the entire circumference of the center in the vertical direction, and has a lower end through which the check valve core 3 is opened by passing through the communication hole 8. It has a push rod 12b that presses the rod as much as possible. The flange 12a of the piston member 12 slides vertically within the cylinder chamber 11,
Disc spring 13 inserted between flange 12a and lid member 9
, the check valve core is always elastically biased in the 3 directions (downward in the figure), while the flange 12
A fuse ring 14 made of a metal material or synthetic resin material that melts when exposed to high temperatures is interposed between a and the bottom wall 7. 15 extends from the communication hole 8 to the outside of the cap body 4.
This is a gas ejection hole drilled in the

In the safety device configured as described above, during normal operation of the accumulator, the piston member 12 is maintained in a state of being pushed up against the elasticity of the disc spring 13 due to the intervention of the fuse ring 14. High pressure gas is maintained within the cell 1 by closing the check valve core 3. When the fuse ring 14 melts due to an outbreak of fire or the like, the piston member 12 is pushed down by the disc spring 13, and the push rod 12b comes into pressure contact with the check valve core 3 to open it, and the high pressure released from the check valve core 3 is removed. The gas is supplied to the high pressure gas outlet 1.
5 and is discharged to the outside.

Next, referring to FIG. 2, a second embodiment of the safety device for an accumulator according to the present invention will be explained only with respect to the parts that are different from the first embodiment. An annular groove is cut into the lower surface of the bottom wall 7 of the cap body 4. The O-ring 16 inserted into the annular groove reliably seals this part. Furthermore, the gas outlet 15 provided in the first embodiment is eliminated, and the high pressure gas ejected from the check valve core 3 passes through the communication hole 8.
It is discharged to the outside from the through hole 10 of the lid member 9 via the outer periphery of the piston member 12 in the cylinder chamber 11.

[Effect of idea]

The present invention has the following effects.

In conventional check valves, the check valve itself seals the gas and opens in the event of an abnormality, so the sealing part is made of a fusible material, making it impossible to improve the sealing ability, and the heat generated by the compressed gas in the cell may cause the check valve to open in the event of an abnormality. This will also cause gas to leak.

In contrast, the present invention can always be hermetically sealed by the check valve core. Further, since the fuse member that melts in the event of an abnormality is separated from the compressed fluid in the shell by the check valve core, it will not be melted. Moreover, since the fuse member is installed on the side that is always in contact with the atmosphere, it is normally possible to maintain it at room temperature to prevent it from melting, and on the other hand, it can sensitively sense heat from external fires, etc. . Furthermore,
Since there is no need to seal the gas inside the cell with a fuse member, it is possible to use a temperature-sensing molten metal that melts when it reaches a certain temperature, such as a non-rubber-like eutectic alloy, which has excellent temperature sensing performance. It is expected that the system will provide a safety device with improved safety. or,
When the compressed fluid in the cell is released in a dangerous manner, the piston member is pushed up and the release is controlled to stop instantaneously, making it safe for people around.

[Brief explanation of the drawing]

The drawings show an embodiment of the safety device for an accumulator according to the present invention, and FIG. 1 is a sectional view showing the safety device according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the safety device according to the second embodiment of the present invention. FIG. 3 is a sectional view showing an example of a safety device according to the prior art. DESCRIPTION OF SYMBOLS 1... Cell, 1a... Annular protrusion, 2... Gas injection hole, 3... Check valve core, 4... Cap body, 5, 6... Recess, 7... Bottom wall, 8...
Communication hole, 9... Lid member, 10... Through hole, 11...
...Cylinder chamber, 12...Piston member, 12a...
...Flame, 12b...Push bar, 13...Disc spring, 14
... Fuse ring, 15 ... Gas vent, 16
...O-ring.

Claims (1)

[Scope of utility model registration request] A check valve core 3 having a valve rod protruding toward the outside of the cell 1 that partitions a gas injection hole 2 in the cell 1 that communicates with the outside and opens and closes the gas injection hole 2, and a check valve core 3 formed outside the check valve core 3. The fuse member 14 is movably disposed in the cylinder chamber 11 communicating with the gas injection hole 2 and is supported by a fuse member 14 that melts at high temperature and is disposed on the check valve core 3 side. When the fuse member 14 melts, the piston member 12 moves under pressure from the spring means 13 and presses the valve stem of the check valve core 3 to open the gas injection hole. Safety device for accumulator that opens valve 2.