JPH08159314A - Rupture disk - Google Patents

Abstract

PURPOSE: To prevent the eccentricity of a disk so as to improve the reliability thereof while keeping alignment. CONSTITUTION: A pressure energizing side channel 8 is formed inside a nipple 2, and a rupture disk consists of a disk 3 to shut out this channel 8, a ring 4 to hold this disk 3, a harpoon 5 having a function to rupture the disk 3 and a cap nut 6 to store the disk 3, the ring 4 and the harpoon 5. A conical notch part 14 is notched on the end surface of the nipple 2, a conical taper 15 is formed along the periphery of the disk 3, and a conical recessed part 16 is recessed in the ring 4. When the rupture disk is assembled, the disk 3 is guided by the conical notch 14 and the conical recessed part 16 so that the disk 3 is prevented from being eccentrically assembled, thus alignment can be retained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rupture disc used for adjusting pressure in a container or a piping system to which pressure is applied when excessive pressure which may impair normal functions is applied.

[0002]

2. Description of the Related Art Usually, a rupture disc is composed of a nipple 2, a disc 3, a ring 4, a moth 5 and a cap nut 6, as shown in FIGS. Mounted on.

That is, one end of a nipple 2 is screwed into a portion where the main pipe 1 is branched, and the cap nut 6 with the disc 3, ring 4 and moly 5 assembled and the nipple 2 are joined by screwing and are in close contact with each other. , The nipple 2 and the disk 3 are pressure boundaries.

Incidentally, the disk 3 normally swells toward the nipple 2 side by a pressurized fluid to form a dome portion 7. When an excessive pressure that may impair the function is applied to the inside of the main pipe 1, the dome portion 7 reversely swells and swells toward the moly 5 side, and the moly 5 breaks the disk 3 to release the pressure. 5 shows a state in which the rupture disc is assembled and attached to the main pipe 1, and FIG. 6 shows an exploded view of the rupture disc in FIG. 5 before assembling.

Pressure is normally applied to the inside of the nipple 2. Further, a pressure application side flow path 8 is formed which is a flow path when opened. The flow path 8 is normally blocked by the disk 3.

The disk 3 is pressed by the ring 4 to prevent pressure leakage. Excessive pressure is the pressure application side flow path 8
, The dome portion 7 of the disc 3 is reversed and bulges toward the molybdenum 5 side, and the moly 5 breaks the disc 3 so that the applied pressure is released through the pressure release side flow passage 9.

The cap nut 6 has a screw relief portion 10 to form a female screw 11, and the female screw 11 and the male screw of the nipple 2 are formed.
12 and screw connection. The other external thread 13 of the nipple 2 is screwed into the main pipe 1 to attach the rupture disc.

[0008]

The rupture disc has a safety function of releasing the pressure against the excessive pressure in the container and the piping system by breaking the disc, but the function is not exhibited depending on the disc assembling method. There is. That is, when the disk is assembled in a state where the dome portion is eccentric, the boundary function expected as a normal function is impaired, pressure leakage occurs, and reliability decreases. The present invention has been made to solve the above problems, and an object of the present invention is to provide a rupture disk that prevents eccentricity of the disk, maintains alignment, and has improved reliability.

[0009]

According to the present invention, there is provided a nipple for screwing and connecting a screw on one end side to a system to which a pressure is applied.
A rupture disc including a cap nut screw-coupled to a screw on the other end of the nipple and having a pressure release flow path and a screw relief portion, and a moly, a ring, and a disc that are sequentially arranged between the cap nut and the nipple. And a conical inclined surface is formed on a peripheral portion of the disc, and an inclined surface having the same angle as the conical inclined surface is formed at a fitting portion of the ring and the nipple that is in contact with the disc. And

Further, according to the present invention, there is provided a nipple for screwing and connecting a screw on one end side to a system to which pressure is applied, and a cap nut having a pressure release flow path and a screw escape portion screwed to the screw on the other end side of the nipple. In a rupture disc including a moly, a ring and a disc that are sequentially arranged between the cap nut and the nipple, a plurality of small holes or grooves are provided in a peripheral portion of the disc, and the plurality of small holes or grooves are provided. It is characterized in that the ring is provided with a small protrusion having a fitting shape.

Further, according to the present invention, there is provided a nipple for screwing and connecting a screw on one end side to a system to which pressure is applied, and a cap nut having a pressure release flow path and a screw relief portion screw-connected to the screw on the other end side of the nipple. In a rupture disc including a moly, a ring, and a disc that are sequentially arranged between the cap nut and the nipple, a taper is formed on a peripheral edge portion of the nipple on which the disc abuts, and a shape along the taper is formed. It is characterized in that the disk is tapered.

Further, according to the present invention, there is provided a nipple for screwing and connecting a screw on one end side to a system to which pressure is applied, and a cap nut having a pressure release flow path and a screw relief portion screw-connected to the screw on the other end side of the nipple. In a rupture disc including a moat, a ring and a disc which are sequentially arranged between the cap nut and the nipple, a screw relief is not formed in the cap nut.

[0013]

With the conical inclined surface, the fitting portion is centered so that the disc and the nipple can be assembled while maintaining the centering property. As a result, it is possible to prevent the accessory equipment of the system to which the pressure is applied in the container and the piping system from being damaged by the excessive pressure. In addition, the guide pin or the alignment groove can maintain the safety function of the rupture disc even if the alignment during assembly is insufficient.

Further, the fitting portion of the ring, the disc and the nipple is formed in such a shape that they can be assembled by superposing only in a regular order in one direction, so that an operator can erroneously assemble the nipple and the cap nut. Further, it is possible to prevent the eccentricity due to the assembly by replacing the ring and the disk portion.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a rupture disc according to the present invention will be described with reference to FIG. In FIG. 1, the same parts as those in FIG. 6 are designated by the same reference numerals. The rupture disc of the first embodiment shown in FIG. 1 has a tapered conical notch portion 14 formed on the tip end surface on the male screw 12 side for screwing with the cap nut 6 of the nipple indicated by reference numeral 2. There is.

A conical taper 15 is formed on the peripheral edge of the disk 3 so as to be fitted into the conical notch 14 and expands outward. Further, a conical recess 16 that fits into the conical taper 15 is formed on one surface of the ring 4 that abuts on the disk 3. The other points are provided with a mortise 5 and a cap nut 6 having the same shape as in FIG. The cap nut 6 has a pressure release side flow passage 9, a screw relief portion 10 and a female screw 11
Are formed.

In the above embodiment, however, the conical taper 15 of the disc 3 is fitted into the conical notch of the nipple 2,
The conical recess 16 of the ring 4 is fitted to the conical taper 15, the molybdenum 5 is brought into contact with the ring 4, and the internal thread 11 of the cap nut 6 is screwed into the external thread 12 of the nipple 2 to form a rupture disk.

Attach the nipple 2 to a container or pipe,
The inside of the nipple 2 is normally pressurized by the normal pressure of these containers or pipes, but is blocked by the disc 3. The disk 3 is pressed by the ring 4 to prevent pressure leakage. As a result, the disc 3 is guided by the conical notch portion 14 of the nipple 2, and the centering property can be maintained without eccentricity.

Next, referring to FIG. 2, a second embodiment of the rupture disc according to the present invention will be described. The second embodiment differs from the first embodiment in that the disk 3 has a plurality of small holes.
17 is provided, and a small protrusion 18 is provided on the ring 4 at a position corresponding to the small hole 17.
Is provided to fit the small protrusion 18 into the small hole 17. Since the other points are the same as those in FIG. 1, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description of the overlapping parts will be omitted.

According to this embodiment, the disk 3 is a ring 4
The eccentricity can be maintained without being eccentric by being guided by, and the event of eccentricity caused by the disk 3 entering the screw relief portion 10 of the cap nut 6 can be avoided.

Further, the safety function of the rupture disc can be maintained even if the alignment at the time of assembly is insufficient.
A groove may be formed instead of the small hole 17, and a small protrusion may be formed along the groove.

Next, referring to FIG. 3, a third embodiment of the rupture disc according to the present invention will be described.

The third embodiment is different from the first embodiment in that the end face of the nipple 2 on the side of the cap nut is provided with a taper portion 19 that widens outward, and a fold shape close to the taper portion 19 is formed. The curved portion 20 is provided on the peripheral portion of the disk 3. Since the other points are the same as those in FIG. 1, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description of the overlapping parts will be omitted.

According to this embodiment, the nipple 2 has a tapered portion 19
Since the disk 3 has a bent portion 20 formed along the taper portion 19, the fitting portion has a shape in which the fitting portion can be assembled by overlapping only in a regular order in one direction.

Therefore, at the time of assembling work, it is possible to prevent an operator from erroneously assembling the parts, and the disc 3 can maintain the alignment without being eccentric because the nipple 2 is guided.

Next, a fourth embodiment of the rupture disc according to the present invention will be described with reference to FIG.

This embodiment has the same construction as that shown in FIG. 6 except that the screw relief portion 10 of the cap nut 6 shown in FIG. 6 is omitted. Therefore, the other description is the same as in FIG. According to this embodiment, since the disc 3 has no room for entering the screw escape portion 6 of the cap nut 6, it is possible to avoid the eccentricity of the disc 3.

[0028]

As described above, according to the present invention, it is possible to prevent the disc from being assembled in an eccentric state and to keep the rupture disc function intact. Therefore, since it is possible to prevent the eccentricity of the disk and maintain the aligning property, it is possible to prevent the pressure leak during normal operation due to the loss of the boundary function, and the reliability of the equipment and system incorporating such a rupture disk. Can be improved.

Further, even if the alignment at the time of assembly is insufficient, the function of the rupture disc can be maintained, and the fitting portion has a superposed shape in a regular order in one direction, so that the worker at the time of assembly work. Can be prevented from mistakenly assembling the parts.

[Brief description of drawings]

FIG. 1 is an exploded view showing a state before assembly in a first embodiment of a rupture disc according to the present invention.

FIG. 2 is an exploded view showing a state before assembly in a second embodiment of the rupture disc according to the present invention.

FIG. 3 is an exploded view showing a state before assembly in a third embodiment of the rupture disc according to the present invention.

FIG. 4 is an exploded view showing a state before assembling of a rupture disc according to a fourth embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing a state in which a conventional rupture disc is attached to a pipe.

FIG. 6 is an exploded view showing a state before assembly in a conventional rupture disc.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main piping, 2 ... Nipple, 3 ... Disc, 4 ... Ring, 5 ... Moly, 6 ... Cap nut, 7 ... Dome part, 8 ... Pressure application side flow path, 9 ... Pressure release side flow path, 10 ... Screw Relief part, 11
… Female threads, 12, 13… Male threads, 14… Conical notch, 15… Conical taper, 16… Conical recess, 17… Small hole, 18… Small projection,
19 ... tapered part, 20 ... folded part.

Claims (4)

[Claims] 1. A nipple screwed into and connected to a system to which a pressure is applied, a cap nut threadedly connected to a screw on the other end of the nipple and having a pressure release flow path and a screw relief portion, the cap nut and the nipple. In a rupture disc including a moly, a ring, and a disc that are sequentially arranged between and, a conical inclined surface is formed on a peripheral edge of the disc,
A rupture disk, wherein an inclined surface having the same angle as the conical inclined surface is formed at a fitting portion of the ring and the nipple where the disk abuts. 2. A nipple screwed into a system to which a pressure is applied and connected, a cap nut threadedly connected to a screw on the other end of the nipple and having a pressure release flow path and a screw relief portion, the cap nut and the nipple. In a rupture disc including a moly, a ring, and a disc that are sequentially arranged between and, a plurality of small holes or grooves are provided in the peripheral portion of the disc, and a small protrusion having a shape that fits into the plurality of small holes or grooves is provided. A rupture disc provided on the ring. 3. A nipple screwed into and connected to a system to which pressure is applied, a cap nut threadedly connected to a screw on the other end of the nipple and having a pressure release flow path and a screw relief portion, the cap nut and the nipple. In a rupture disc including a moly, a ring and a disc which are sequentially arranged between the disc and the disc, a taper is formed on a peripheral edge portion of the nipple with which the disc abuts, and the disc is tapered in a shape along the taper. A rupture disc that is characterized by 4. A nipple screwed into a system to which a pressure is applied and connected, a cap nut threadedly connected to a screw on the other end of the nipple and having a pressure release flow path and a screw relief portion, the cap nut and the nipple. A rupture disc comprising a moly, a ring and a disc which are sequentially arranged between the cap nut and the cap nut, wherein no screw relief is formed in the cap nut.