JPH066241Y2 - Accumulator safety device - Google Patents

Description

[Detailed Description of the Invention] Industrial Application This invention relates to a safety device for an accumulator,
Furthermore, when various equipments equipped with accumulators receive a fire, there is a danger that the internal pressure of the equipment will increase with temperature rise and destroy the equipment. In other words, the accumulator has a built-in airtight bladder, and high-pressure gas is enclosed in the bladder. When the temperature of the gas reaches 300 ° C, the pressure will be about twice as high as the pressure at room temperature, and the pressure resistance of the pressure vessel will be lower than that at room temperature, preventing accidents due to the rupture of the accumulator and at the same time filling the gas. The present invention relates to a device for preventing gas leakage due to seal breakage during pressure detection.

2. Description of the Related Art Conventionally, this type of accumulator has a recess 2 and a gas passage 3 formed in a container body 1 on the gas chamber side as shown in FIG. 11, through which gas is supplied to and discharged from a gas chamber 4. Are doing. The passage 3 is opened and closed by a countersunk bolt 5 screwed from the outside to the inside, but in order to prevent gas leakage from the screw portion 8, the passage 3 between the head lower portion of the bolt 5 and the recess 2 is prevented. An O-ring 7 made of rubber is fitted in the space 6 and sealed.

Problems to be Solved by the Invention In the conventional accumulator, the gas in the gas chamber 4 is discharged to check the gas pressure. Therefore, when the bolt 5 is loosened, the O-ring 7 is pushed upward by the gas leaking from the screw portion 8. The O-ring 7 is deformed due to deformation, and a part thereof protrudes from the gap formed between the concave portion 2 and the upper portion of the bolt head and is damaged by being peeled off, so that the O-ring 7 will leak gas unless it is replaced after checking the gas pressure. That is, when the gas filling pressure is detected, the O-ring 7 cannot be used unless the O ring 7 is replaced and the gas is filled again.

Further, the accumulator has a structure in which the gas cannot be automatically discharged to the outside of the container even if the outer peripheral temperature rises due to the occurrence of a fire and the gas pressure in the gas chamber rises. In other words, even if the O-ring 7 loses its sealing property, the gap between the bolt 5 on the outside of the O-ring 7 and the recess 2 is equal to zero, so it is impossible to discharge a large amount of gas in a short time. Therefore, the accumulator may burst. Therefore, in order to solve the above-mentioned problems, a flanged valve casing is loosely fitted into the through hole of the pressure vessel from the inside to the outside to form a gap between the through hole wall and the valve casing peripheral wall, A fuse packing is interposed between the inner surface of the pressure vessel and the collar, a tightening nut is screwed into the valve casing on the outer side of the pressure vessel, and the inner surface of the pressure vessel is directly connected to the collar. A safety device for an accumulator has been used in which a passage is formed in the collar to connect the void and the inside of the pressure vessel to each other when they are brought into contact with each other (see JP-A-59-93501).

However, in the safety device of this accumulator, the so-called insect is used to seal the inlet of the enclosed gas and the fuse packing is melted to ensure safety, so the fuse packing and the insect must be prepared separately.

Further, since the valve casing is inserted into the through hole from the inside to the outside of the pressure vessel, when the fuse packing needs to be replaced, the following processing is performed.

(1) Disassemble the accumulator and replace the fuse packing.

(2) If it cannot be disassembled, discard it and replace with a new accumulator.

However, in the method (1), the replacement work is troublesome and time-consuming, and since the system must be stopped during the work, the operation rate becomes poor.

Further, the method (2) is wasteful and uneconomical because the accumulator is discarded every time the fuse packing is replaced.

In view of the above points, the present invention aims to prevent troubles during pressure detection and to improve the sealing property and safety of the accumulator.

Another object is to facilitate the replacement of fuse packings and the elimination of bugs.

Means for Solving the Problems The present invention is to provide a mounting portion for an air supply three-way valve on the outer periphery of the head of a container body on the gas chamber side, form a recess on the upper surface of the head, and to form a gas passage in the recess. And an external exhaust hole communicating with the atmosphere between the recess wall surface and the bolt head outer edge by screwing a bolt having an internal exhaust hole communicating with the inside of the container body from the outside to the inside of the passage. And a fuse packing is formed by sandwiching a thermal fuse between the bolt head bottom portion and the recess, and the thermal fuse is disposed between the inner exhaust hole and the outer exhaust hole. The above-mentioned problem is solved by the safety device of.

Action Attach the air supply three-way valve to the mounting part of the head, fill the gas chamber with a predetermined amount of gas, and screw the bolts from the outside to the inside of the gas passage. While being pushed by, the space is completely closed and the connection between the inner exhaust hole and the outer exhaust hole is broken.

The gas in the inner exhaust hole pushes the fuse packing, but the radial force of the gas is received by the recess wall surface, and the upward force thereof is received by the bolt head bottom portion to suppress the deformation of the fuse packing.

When the ambient temperature around the accumulator rises due to a fire, the fuse packing melts and the gas pressure pushes it out of the outer exhaust hole, creating a space, and the gas in the gas chamber passes from the inner exhaust hole to the outer space. Flowing to the exhaust hole,
It is discharged to the outside in a short time.

In this way, the fuse packing functions as a sealing material and a safety valve.

Embodiment An embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, 10 is an accumulator, 11 is a container main body, and the inside thereof is partitioned into a gas chamber 13 and a liquid chamber 14 by an elastic diaphragm 12. Liquid chamber side container body 11a
Is provided with an inlet / outlet port 15 through which liquids such as oil come in and out,
Further, a projecting head portion 11b is formed on the container body 11 on the gas chamber side. The head portion 11b is provided with a mounting portion of the air supply three-way valve having a step portion, a cylindrical recess 16 and a gas passage 17. The passage 17 is a screw hole formed in the center of the recess 16 and communicates with the gas chamber 13. Reference numeral 18 denotes a bolt, which is a T-shaped member including a bolt head 18a having a diameter slightly smaller than the inner wall diameter of the recess 16 and a bolt body 18b screwed into the gas passage 17, as shown in FIGS. It is a bolt. The lower surface of the bolt head 18a is an inclined surface that becomes deeper inward. At the center of the bolt body 18b,
An inner exhaust hole 19 is formed so as to communicate in the radial direction from the axial direction. The bolt 18 is screwed while turning the bolt 18 from the outside to the inside of the gas passage 17, and the bolt head bottom portion 18c and the recess 1
The space 20 with the space 6 is formed in a substantially trapezoidal cross section as shown in FIG. Reference numeral 21 denotes an annular outer exhaust hole communicating with the atmosphere, which is a gap having a space S formed between the recess wall surface 16c and the bolt head outer edge 18d. The outer exhaust hole 21 communicates with the inner exhaust hole 19 via the space 20. Two
Reference numeral 3 denotes a ring-shaped fuse packing, which is formed by a thermal fuse sandwiched in the space 20 and has a cross section with an inner wall 23a longer than an outer wall 23b and a bottom surface 2 as shown in FIG.
3d is a horizontal trapezoid. The thermal fuse is, for example, 1
It is 12 nylon that melts at 20 ° C to 180 ° C.

Next, the operation of this embodiment will be described. First, a known air supply three-way valve (not shown) for supplying and discharging gas to and from the accumulator will be described.

The air supply three-way valve is attached to the mounting portion 11B of the accumulator, the recess 16 is covered and the bolt 18 is rotated in the opening direction to loosen the tightening of the fuse packing 23, and the bolt bottom portion 18c and the upper surface 23c of the fuse packing 23.
Form a gap between and. Then, the gas such as the nitrogen gas supplied from the air supply port is discharged to the outside exhaust hole 21, the gap,
The gas enters the gas chamber 13 through the inner exhaust hole 19 and the gas passage 17.

When the gas pressure in the gas chamber 13 reaches a predetermined value, the bolt 18 is rotated in the opposite direction to tighten the fuse packing 23.

Then, the exhaust three-way valve is attached to the accumulator mounting portion 11B.
Remove from The more the bolt 18 is tightened, the more the fuse packing 23 is pushed toward the inner wall 23a of the packing 23, and its spread toward the outer wall 23b is received by the recess wall surface 16c, and the gas pressure of the gas chamber 13 is 210 Kg / cm ² . At this time, even if the gap S of the outer exhaust hole 21 is 0.5 mm, the fuse packing does not stick out, and an effective sealing property is exhibited. The screw portion 18e and the inner exhaust hole 19 are completely sealed by the fuse packing 23.

The pressure in the radial direction of the fuse packing 23 is
The bolt head bottom portion 18c receives the upward pressure to prevent the fuse packing from being deformed. However, when a radial force from the inner wall 23a of the fuse packing 23 toward the outer wall 23b is applied, the fuse packing 23 has a trapezoidal cross section. The fuse packing 23 is
The seal pressure increases, and the high-pressure seal effectively operates.

When a fire or the like occurs and the outer peripheral temperature of the accumulator 10 rises, the fuse packing 23 melts and a space 20 is created as shown in FIG. 3, and the space 20 and the inner exhaust hole 19 and the outer exhaust hole 21 are separated from each other. In communication with each other, the gas in the gas chamber 13 flows in the directions of arrows A19 to A21, is discharged to the outside of the container, and prevents the container body from bursting to maintain safety. At this time, the larger the gap S between the outer exhaust holes 21, the greater the amount of gas discharged, and the higher the safety. The fuse packing 23
Since it has both the function of the fuse and the function of sealing the air supply port, unlike the conventional example, it is not necessary to use another insect of the fuse packing.

Further, when checking the gas pressure in the gas chamber 13 of the accumulator, the air supply three-way valve is attached to the accumulator mounting portion 11B in the same manner as described above, and the bolt 18 is rotated in the opening direction to loosen the tightening of the fuse packing 23 to loosen the bolt. A gap is formed between the bottom portion 18c and the upper surface 23c of the fuse packing 23. Then, the gas in the gas chamber 13 flows into the three-way valve through the gas passage 17, the inner exhaust hole 19, the gap, and the outer exhaust hole 21.

When the gas pressure flowing into the three-way valve is higher than a predetermined pressure, the gas is discharged to the outside of the device, and conversely, when the gas pressure is low, the gas is supplied until it reaches a predetermined pressure.

At this time, the fuse packing 23 has a large mechanical strength.
Since it is made of 2 nylon, unlike rubber packing, it is not pushed into the gap formed between the recess 16 and the bolt head 18c. Therefore, unlike the rubber packing of the conventional example, it does not stick out from the gap created between the recess and the bolt head, so as soon as the check is finished, rotate the bolt 18 in the opposite direction and tighten the fuse packing 23. The fuse packing 23 completely returns to its original state.

Furthermore, the bolt 1 that is tightening the fuse packing 23
Since 8 can be easily attached and detached to and from the accumulator outside the device, the fuse packing can be easily replaced when the fuse packing 23 is damaged or rubber adheres to deteriorate the sealing performance.

Other Embodiments Embodiments of the present invention are not limited to the above. For example, as shown in FIG. 5, the bottom of the recess 16 is lowered inward, and the lower surface of the bolt head is turned inward. Raise the space 20
To form a fuse packing having a trapezoidal cross section in which the upper surface 23c and the bottom surface 23d are both inclined and the inner wall 23a is longer than the outer side 23b, and the screw portion 18e of the bolt 18 is formed.
The inner exhaust groove 19b may be formed in the inside.

Further, as shown in FIGS. 5 to 7, the threaded portion 1 of the bolt 18 is
A groove 19b may be formed in the axial direction 8e, and the groove 19b may be an inner exhaust hole 19b instead of the inner exhaust hole 19.

Further, as shown in FIG. 8, the lower surface of the bolt head is made horizontal and the bottom of the recess 16 is lowered inward to form the space portion 20, the upper surface 23c is horizontal, the lower surface 23d is inclined, and the inner wall 23a is formed. Forms a fuse packing 23 having a trapezoidal cross section that is higher than the outer wall 23b, and forms a vertical hole 19 in the container body 11b.
c or the inner exhaust groove 19b shown in FIG. 7 is formed, and the vertical hole 19c is used as the inner exhaust hole, the exhaust hole can be made large, and the amount of gas discharged can be increased, thereby further improving safety.

As shown in FIG. 9, the lower surface of the bolt head is lowered inward to make the bottom of the recess 16 horizontal to form the space 20, the upper surface 23c is inclined and the lower surface is horizontal, and the inner wall 23a is the outer wall 2.
A fuse packing having a trapezoidal cross section shorter than 3b is formed, a lateral hole 21a communicating with the space 20 and the atmosphere is formed in the container body 11b, and the lateral hole 21a and the gap S are used as an outer exhaust hole, or FIG. As shown in FIG. 5, the lower surface of the bolt head and the bottom of the recess may be horizontal, and the inner wall 23a and the outer wall 23b may be equal to each other to form the space 20 and form the fuse packing having a square or rectangular cross section.

For the sake of design, when the space S between the outer exhaust holes is made small, if a lateral hole 21a having an appropriate size is bored in the container body 11b as shown in FIG. 9, a large amount of gas is discharged. So it's safe.

Effect of the Invention Since the present invention is configured as described above, the fuse packing extends in the radial direction and completely closes the space while being sandwiched between the bolt head bottom and the recess.

Therefore, the screw portion and the inner exhaust hole are completely sealed so that gas leakage does not occur. Further, unlike the conventional example, the fuse packing has no protruding development, so that the seal member is not damaged during pressure detection. Therefore, the seal leakage from the fuse packing can be prevented, so that it is not necessary to re-enclose the gas due to the seal leakage as in the conventional example.

Further, when the outer peripheral temperature of the accumulator rises, the fuse packing melts and the inner exhaust hole and the outer exhaust hole communicate with each other, so that the gas in the gas chamber is discharged to the outside of the device. At this time, since the outer exhaust hole is formed in a ring shape, it is possible to exhaust a larger amount and at a slower speed than the exhaust from a single linear exhaust hole. Therefore, even if there is an operator in the vicinity of the accumulator, there is no adverse effect such as being injured by exhaust air from the exhaust hole, and it is possible to prevent the accumulator from bursting and ensure safety. Further, since the mounting portion for the air supply three-way valve is provided, air supply and exhaust can be performed without so-called bugs. Therefore, insects are unnecessary and the mounting member is also unnecessary, so that the structure is simple and the handling is easy.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged cross-sectional view of an essential part of the drawing, FIG. 3 is a vertical cross-sectional view showing another state of FIG. 2, FIG. 5 to 10 are longitudinal sectional views showing another embodiment of the present invention, and FIG. 7 is a sectional view taken along line V of FIG.
FIG. 11 is a view showing a part of a cross section taken along line II-VII, and FIG. 11 is a vertical cross sectional view showing a conventional example. 10 ... Accumulator 11 ... Container body 16 ... Recessed portion 17 ... Gas passage 18 ... Bolt 19 ... Inner exhaust hole 21 ... Outer exhaust hole 23 ... Fuse packing

Claims (1)

[Scope of utility model registration request] 1. A mounting portion for an air supply three-way valve is provided on an outer periphery of a head portion of a container body on the gas chamber side, a recess is formed on an upper surface of the head portion, a gas passage is provided in the recess, and the passage is provided in the passage. A bolt having an inner exhaust hole communicating with the inside of the container body from the outer side toward the inner side is screwed to form an outer exhaust hole communicating with the atmosphere between the recess wall surface and the outer edge of the bolt head, and the bolt head. A safety device for an accumulator, wherein a fuse packing is formed by sandwiching a thermal fuse between the bottom portion and the recess, and the thermal fuse is disposed between the inner exhaust hole and the outer exhaust hole.