A rapid-breakage anti-arch blade-shaped rupture disc

Abstract

This utility model discloses a rapid-breaking inverted arched blade-type rupture disc, relating to the technical field of safety pressure relief devices. It includes an upper clamping ring, a blade holder assembly, a rupture disc, and a lower clamping ring. The blade holder assembly consists of a support frame and main and auxiliary blades. This utility model uses the rupture disc as the main pressure control element, clamped and fixed by the upper and lower clamping rings. The blade holder assembly is fixed inside the upper clamping ring, with its sharp tip facing the concave side of the rupture disc. When the rupture disc reaches its burst pressure, it flips and deforms, impacting the blade holder assembly. First, the main and auxiliary blades break it at the center and edges, significantly reducing its strength. Then, it is torn apart by the support frame, ultimately cutting the rupture disc into four fan-shaped blocks, opening the pressure relief channel. This structure changes the traditional cracking method of inverted arched blade-type rupture discs, enabling rapid breaking of rupture discs that cannot be broken by traditional structures, such as those with high nominal or low pressure ratings. It has advantages such as low cost, high reliability, and ease of processing.

Description

Technical Field

[0001] This utility model relates to the technical field of safety pressure relief devices, specifically a rapid-bursting anti-arch blade-type rupture disc. Background Technology

[0002] A rupture disc is a single-use overpressure safety relief element widely used in pressure-bearing equipment in chemical, petroleum, pharmaceutical, and aerospace industries. Since its introduction in the 1930s, rupture disc technology has developed into various structures, including positive arch, flat plate, graphite, and inverted arch. Among them, the inverted arch rupture disc with a blade has become the mainstream choice for medium and low-pressure systems due to its stable operation, high operating ratio, and long fatigue life.

[0003] The basic structure of a traditional inverted arch rupture disc with a blade is as follows: the inverted arch rupture disc and the blade holder assembly are fixed by upper and lower clamping rings, respectively, with the concave surface of the rupture disc facing the blade holder. When the system pressure reaches the set burst value, the rupture disc instantly flips from concave to convex, and its kinetic energy impacts the blade holder, causing the rupture disc to rupture along the blade edge of the blade holder, forming a pressure relief channel.

[0004] However, as devices develop towards larger sizes and lower voltages, the traditional structure has revealed the following shortcomings: 1. Slow breaking speed: Traditional blade holders are only composed of cross-shaped support blades, with few cutting edges and a single cutting path. For working conditions with a nominal diameter ≥ DN200 or burst pressure ≤ 0.05MPa, most of the kinetic energy after the rupture disc flips is absorbed by its own plastic deformation. The cutting edge cannot generate sufficient stress concentration in a short time, resulting in the phenomenon of "flipping without breaking" occurring frequently.

[0005] Insufficient reliability: If the rupture disc fails to rupture in time, the system pressure will continue to rise, causing equipment overpressure or even an explosion.

[0006] Poor adaptability: To solve the problem of premature breakage, some manufacturers have adopted methods such as increasing the strength of materials or increasing the thickness of rupture discs, but this will sacrifice sensitivity and increase costs; there are also solutions that use multi-stage rupture disc combinations, but this brings new problems such as complex structure and difficult maintenance.

[0007] Therefore, under low pressure and large diameter conditions, how to balance rapid collapse, high reliability and low cost has become a technical bottleneck that needs to be overcome for anti-arch blade-type rupture discs. Summary of the Invention

[0008] The purpose of this invention is to provide a rapid-breaking anti-arch blade-type rupture disc to solve the problem mentioned in the background art that existing anti-arch rupture discs cannot break quickly or even at all.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a rapid-breaking, anti-arch, blade-type rupture disc, comprising an upper clamping ring, a rupture disc, and a lower clamping ring arranged sequentially from top to bottom; the upper clamping ring has a built-in blade holder assembly; the upper clamping ring includes a circularly arranged upper clamping ring body with a radially inwardly protruding upper clamping stop ring near the top of its inner side and a downwardly protruding upper clamping boss at the bottom of its inner side; the blade holder assembly includes two cross-shaped isosceles triangular support blade holders, the bottom surface of the support blade holders having... The device has a main blade slot and a main blade at its core. Secondary blade slots are located on both sides of the main blade slot, and secondary blades are welded and fixed thereon. The supporting blade holder, main blade, and secondary blades all have sharp cutting edges machined near the rupture disc. The rupture disc is an inverted arch shape, using a single-layer or composite-layer structure. It includes an outer ring of the rupture disc with a spherical, downward-protruding rupture disc dome fixed to its inner diameter. The lower clamping ring is a circular structure, and its top end near the outer surface has an upward-protruding lower clamping boss.

[0010] Preferably, the thickness of the upper clamping retaining ring is 1-10mm, and the height of the upper clamping boss is 3-10mm.

[0011] Preferably, the tool holder assembly is connected and fixed to the upper clamping ring by welding or bolt pre-tightening.

[0012] Preferably, one of the tool holders has a recessed rectangular lower slot at the center of its bottom surface, and the other tool holder has a recessed rectangular upper slot at the center of its top surface. The two tool holders are fixed by welding after being interlocked by the rectangular lower slot and the rectangular upper slot, thereby clamping the two tool holders into a cross shape.

[0013] Preferably, the distance between the two auxiliary blades on the same support blade holder is half the length of the support blade holder.

[0014] Preferably, the main blade is arranged in an isosceles triangle, and a concave lower groove is provided at the center of the top surface of one main blade, and an upper groove is provided at the center of the top surface of the other main blade. The two main blades are locked together in a cross shape by the mutual locking and fixing of the lower and upper grooves. The two cross-shaped main blades are welded and fixed to the main blade slots of the two supporting blade holders.

[0015] Preferably, the cutting edge angle on the supporting blade holder is 30°-90°; the cutting edge angle of the main blade is 15°-60°.

[0016] Preferably, the outer diameter of the outer ring of the rupture disc is equal to the outer diameter of the upper clamping boss; the height of the dome of the rupture disc is greater than the height of the tool holder assembly extending beyond the upper clamping ring.

[0017] Preferably, the inner diameter of the lower clamping boss is 0.1-5 mm larger than the outer diameter of the upper clamping boss, and the height of the lower clamping boss is greater than the height of the upper clamping boss.

[0018] Preferably, the inner diameter of the lower clamping ring is equal to the inner diameter of the outer ring of the rupture disc, and the height of the lower clamping ring is greater than the height of the dome of the rupture disc.

[0019] Compared with the prior art, the beneficial effects of this utility model are: 1. Significantly improved breaking speed: The central main blade forms an initial fracture at the center of the rupture disc's dome, while the edge secondary blades simultaneously cut at half the radial radius, causing the rupture disc to instantly lose its overall strength; the support blade holder continues to tear along the preset path, dividing the rupture disc into four fan-shaped blocks, opening the pressure relief channel 100%, and reducing the entire process time by more than 50% compared to traditional structures; 2. Significantly expanded application scope: It can cover working conditions with nominal diameters of DN50 to DN800 and burst pressures of 0.01 to 1.0 MPa, completely solving the problem that large-diameter, low-pressure systems cannot be broken; it is compatible with both single-layer and composite-layer rupture discs, without the need to adjust the main material, reducing the difficulty of selection; 3. High safety and reliability: The main blade, secondary blade and support blade holder all face the concave surface of the rupture disc, and make zero-gap contact after flipping to avoid energy loss; the multi-angle cutting edge design of 30° to 90° ensures stable cutting under different temperature and medium conditions; 4. Low cost and easy to process: The tool holder assembly can be formed by punching or laser cutting, and can be fixed by welding or bolting without precision machining; the upper and lower clamping rings use existing molds, and only the tool holder part is modified locally, increasing the unit cost by less than 5%; 5. Easy maintenance: The overall modular design eliminates the need to disassemble the blade holder when replacing the rupture disc, reducing downtime; all cutting edges can be non-destructively inspected to ensure reliability in long-term standby mode.

[0020] In summary, this utility model, without altering the original advantages of the anti-arch blade-type rupture disc, achieves a comprehensive performance improvement of "rapid rupture, low-pressure usability, large-diameter compatibility, low cost, and high reliability" by optimizing the blade holder structure. It can be widely applied to the safety relief systems of various pressure-bearing equipment. Attached Figure Description

[0021] Figure 1 This is a three-dimensional view of the structure of this utility model; Figure 2 This is a perspective view of the combination of the upper clamping ring and the tool holder assembly of this utility model; Figure 3 This is a front view of the combination of the upper clamping ring and the tool holder assembly of this utility model; Figure 4 This is the main view of the rupture disc of this utility model; Figure 5 This is a front view of the lower clamping ring of this utility model; Figure 6 This is the main view of the support frame of this utility model; Figure 7 This is the main view of the main blade of this utility model; Figure 8 This is the main view of the secondary blade of this utility model; In the diagram: Upper clamping ring-1, Upper clamping ring body-11, Upper clamping retaining ring-12, Upper clamping boss-13, Tool holder assembly-2, Support tool holder-21, Rectangular lower slot-22, Rectangular upper slot-23, Main tool slot-24, Main tool-25, Sub-tool slot-26, Sub-tool-27, Main tool lower groove-28, Main tool upper groove-29, Fracturing disc-3, Fracturing disc outer ring-31, Fracturing disc dome-32, Lower clamping ring-4, Lower clamping boss-41. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Please refer to Figure 1-8 , Figure 1 This is a three-dimensional view of the structure of this utility model; Figure 2 This is a perspective view of the combination of the upper clamping ring and the tool holder assembly of this utility model; Figure 3 This is a front view of the combination of the upper clamping ring and the tool holder assembly of this utility model; Figure 4 This is the main view of the rupture disc of this utility model; Figure 5 This is a front view of the lower clamping ring of this utility model; Figure 6 This is the main view of the support frame of this utility model; Figure 7 This is the main view of the main blade of this utility model; Figure 8 This is the front view of the secondary blade of this utility model.

[0024] This utility model provides a rapid-breaking anti-arch blade-type rupture disc, which includes an upper clamping ring 1, a rupture disc 3, and a lower clamping ring 4 arranged sequentially from top to bottom. The upper clamping ring 1 has a built-in blade holder assembly 2.

[0025] The upper clamping ring 1 includes an annular upper clamping ring body 11. The upper clamping ring body 11 has a radially inwardly protruding upper clamping stop ring 12 near the top end on its inner side. The upper clamping ring body 11 has a downwardly protruding upper clamping boss 13 near its inner side at its bottom end. The upper clamping stop ring 12 has a thickness of 1-10mm, and the upper clamping boss 13 has a height of 3-10mm.

[0026] The tool holder assembly 2 is connected and fixed to the upper clamping ring 1 by welding or bolt pre-tightening. It includes two isosceles triangular support tool holders 21. One support tool holder 21 has a recessed rectangular lower slot 22 at the center of its bottom surface, and the other support tool holder 21 has a recessed rectangular upper slot 23 at the center of its top surface. The two support tool holders 21 are welded together after interlocking with the rectangular lower slot 22 and rectangular upper slot 23, thus clamping them into a cross shape. A main tool slot 24 is provided at the center of the bottom surface of each support tool holder 21, and a main tool 25 is provided thereon. Secondary tool slots 26 are provided on both sides of the main tool slot 24, and secondary tools 27 are welded and fixed thereon. The distance between the two secondary tools 27 on the same support tool holder 21 is the distance between the two secondary tools 27 on the same support tool holder 21. The length of the support frame 21 is half that of the main blade 25. The main blade 25 is arranged in an isosceles triangle, with a recessed lower main blade groove 28 at the center of the top surface of one main blade 25 and an upper main blade groove 29 at the center of the top surface of the other main blade 25. The two main blades 25 are locked together in a cross shape by the mutual locking of the lower and upper main blade grooves 28 and 29. The two cross-shaped main blades 25 are welded and fixed to the main blade slots 24 of the two support frames 21. In addition, the support frame 21, the main blade 25, and the auxiliary blade 27 are all machined with sharp cutting edges on the side near the rupture disc 3. The cutting edge angle of the support frame 21 is 30°-90°, and the cutting edge angle of the main blade 25 is 15°-60°. The rupture disc 3 is an inverted arch rupture disc, employing a single-layer or composite-layer structure; it includes an outer ring 31 with an outer circular arrangement, and a spherical, downward-protruding rupture disc dome 32 fixed to the inner diameter of the outer ring 31; the outer diameter of the outer ring 31 is equal to the outer diameter of the upper clamping boss 13; the height of the rupture disc dome 32 is greater than the height of the tool holder assembly 2 extending beyond the upper clamping ring 1; The lower clamping ring 4 is a circular ring structure, and its top end near the outer side is provided with an upwardly protruding lower clamping boss 41. The inner diameter of the lower clamping boss 41 is 0.1-5mm larger than the outer diameter of the upper clamping boss 13, and the height of the lower clamping boss 41 is greater than the height of the upper clamping boss 13. The inner diameter of the lower clamping ring 4 is equal to the inner diameter of the outer ring 31 of the rupture disc, and the height of the lower clamping ring 4 is greater than the height of the dome 32 of the rupture disc. In use, the upper clamping ring 1 is pressed and fixed to the rupture disc 3 and the lower clamping ring 4 by the equipment flange; when the rupture disc 3 reaches the bursting pressure and flips over and becomes unstable, its arched surface changes from convex to concave. Due to the working pressure and inertial force, the rupture disc flips over and comes into contact with the main blade 25 and the secondary blade 27 and breaks in milliseconds. Finally, it is torn apart by the supporting blade holder 21, realizing the opening of the release channel in milliseconds.

[0027] This invention enables the reverse-arched rupture disc to break in milliseconds after blasting and flipping, with the main and auxiliary blades breaking the disc at multiple locations, significantly reducing its strength and guiding it to tear along the support frame direction, thus achieving millisecond-level cracking. This solves the problem that reverse-arched rupture discs cannot break quickly or even at all. This invention has the advantages of low cost, high reliability, and easy processing.

[0028] Although embodiments of the present invention have been shown and described, it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, it will be understood by those skilled in the art that all other embodiments obtained by making various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the present invention and without creative effort are within the scope of protection of the present invention.

Claims

1. A rapid-breaking, anti-arch, knife-shaped rupture disc, characterized in that: The assembly includes, from top to bottom, an upper clamping ring (1), a rupture disc (3), and a lower clamping ring (4). The upper clamping ring (1) houses a tool holder assembly (2). The upper clamping ring (1) includes an annular upper clamping ring body (11) with a radially protruding upper clamping stop ring (12) near the top of its inner side and a downwardly protruding upper clamping boss (13) at the bottom of its inner side. The tool holder assembly (2) includes two cross-shaped isosceles triangular support tool holders (21). The support tool holders (21) have a main tool slot (24) at the center of their bottom surface and a main tool (25). The main blade slot (24) is provided with a secondary blade slot (26) on both sides and a secondary blade (27) is welded and fixed thereon. The support blade holder (21), the main blade (25) and the secondary blade (27) are all machined with sharp cutting edges on the side near the rupture disc (3). The rupture disc (3) is an inverted arch rupture disc and adopts a single-layer or composite layer structure. It includes an outer ring (31) of the rupture disc arranged in a circular shape on the outside. A spherical downward protruding rupture disc dome (32) is fixed at the inner diameter of the outer ring (31). The lower clamping ring (4) is a circular structure and a downward protruding lower clamping boss (41) is provided at its top near the outer side.

2. The rapid-breaking anti-arch blade-type rupture disc according to claim 1, characterized in that: The thickness of the upper clamping retaining ring (12) is 1-10mm, and the height of the upper clamping boss (13) is 3-10mm.

3. The rapid-breaking anti-arch blade-type rupture disc according to claim 2, characterized in that: The tool holder assembly (2) is connected and fixed to the upper clamping ring (1) by welding or bolt pre-tightening.

4. The rapid-breaking anti-arch blade-type rupture disc according to claim 3, characterized in that: One of the tool holders (21) has a recessed rectangular lower slot (22) at the center of its bottom surface, and the other tool holder (21) has a recessed rectangular upper slot (23) at the center of its top surface. The two tool holders (21) are fixed by welding after the rectangular lower slot (22) and the rectangular upper slot (23) are engaged with each other, thereby clamping the two tool holders (21) into a cross shape.

5. The rapid-breaking anti-arch blade-type rupture disc according to claim 4, characterized in that: The distance between the two auxiliary blades (27) on the same support blade holder (21) is half the length of the support blade holder (21).

6. The rapid-breaking anti-arch blade-type rupture disc according to claim 5, characterized in that: The main blade (25) is set in an isosceles triangle, and a concave main blade groove (28) is provided at the center of the top surface of one main blade (25), and an upper main blade groove (29) is provided at the center of the top surface of the other main blade (25). The two main blades (25) are clamped into a cross shape by the mutual locking and fixing of the main blade groove (28) and the upper main blade groove (29). The two cross-shaped main blades (25) are welded and fixed at the main blade slots (24) of the two supporting blade holders (21).

7. The rapid-breaking anti-arch blade-type rupture disc according to claim 6, characterized in that: The cutting edge angle on the supporting blade holder (21) is 30°-90°; the cutting edge angle of the main blade (25) is 15°-60°.

8. The rapid-breaking anti-arch blade-type rupture disc according to claim 7, characterized in that: The outer diameter of the outer ring (31) of the rupture disc is equal to the outer diameter of the upper clamping boss (13); the height of the rupture disc dome (32) is greater than the height of the tool holder assembly (2) beyond the upper clamping ring (1).

9. The rapid-breaking anti-arch blade-type rupture disc according to claim 8, characterized in that: The inner diameter of the lower clamping boss (41) is 0.1-5 mm larger than the outer diameter of the upper clamping boss (13), and the height of the lower clamping boss (41) is greater than the height of the upper clamping boss (13).

10. The rapid-breaking anti-arch blade-type rupture disc according to claim 9, characterized in that: The inner diameter of the lower clamping ring (4) is equal to the inner diameter of the outer ring (31) of the rupture disc, and the height of the lower clamping ring (4) is greater than the height of the dome (32) of the rupture disc.

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