Groove and slit combined low pressure slit type burst disc

Abstract

This utility model discloses a grooved and slotted combination low-pressure rupture disc, relating to the technical field of safety pressure relief devices. It includes a slotted metal diaphragm, a grooved metal diaphragm, and a bracket assembly. By replacing the traditional non-metallic sealing diaphragm with a grooved metal diaphragm, the maximum operating temperature of the rupture disc is increased from 260℃ to 530℃, completely solving the problem of inability to select the right type for high-temperature, low-pressure conditions. The metal sealing surface is unaffected by burrs, particles, or coal slag punctures, eliminating the risks of leakage and aging associated with non-metallic diaphragms, and significantly extending its service life. The slotted metal diaphragm is responsible for precisely controlling the burst pressure, while the grooved metal diaphragm only serves as a seal and assists in rupture; therefore, the requirements for groove depth accuracy are less stringent, significantly reducing processing difficulty and testing costs. The rupture disc is a three-layer resistance-welded composite component, requiring no additional cooling and insulation devices, without altering the original pipeline layout. The installation space is consistent with traditional low-pressure rupture discs, making maintenance and replacement simple.

Description

Technical Field

[0001] This utility model relates to the technical field of safety pressure relief devices, specifically a low-pressure slit-type rupture disc with a combination of groove and slit. Background Technology

[0002] Rupture discs are critical overpressure protection components for pressure vessels, pipelines, and reactors. When the internal pressure of the equipment rises abnormally, the rupture disc ruptures instantly at the set pressure, rapidly releasing the medium and preventing an explosion due to overpressure. Pressure vessels are classified into low-pressure, medium-pressure, and high-pressure types, and the required working pressures vary widely, necessitating the design of various types of rupture discs to match. Based on their structural form, rupture discs are typically classified as positive arch, negative arch, and flat plate; the positive arch type is further subdivided into standard positive arch, grooved positive arch, and slotted positive arch.

[0003] 1. In the existing technology, the normal arch type rupture disc is suitable for high pressure and small diameter working conditions;

[0004] 2. The positive arch grooved rupture disc is mostly used in medium and high pressure conditions. However, under low pressure (<0.1MPa) conditions, it is difficult and costly to manufacture due to the extremely high requirements for material thickness and groove depth machining accuracy.

[0005] 3. The arched slotted rupture disc, with its composite structure of "slotted metal diaphragm + non-metallic sealing diaphragm", can achieve precise rupture in the medium and low pressure range and even ultra-low pressure range, and is currently the mainstream solution for low-pressure conditions.

[0006] However, the aforementioned slotted rupture disc has the following inherent defects:

[0007] (1) Non-metallic sealing materials (such as polytetrafluoroethylene, fluororubber, etc.) generally have a maximum temperature resistance of ≤260℃, which cannot meet the requirements of high-temperature process sections such as 400℃~530℃.

[0008] (2) Non-metallic diaphragms are easily punctured by metal burrs, solid particles, coal slag, etc., leading to premature leakage or accidental explosion;

[0009] (3) When the process medium is food or pharmaceutical grade, non-metallic materials are difficult to meet the requirements of all-metal food grade.

[0010] (4) Under conditions of frequent changes in pulse pressure or back pressure, non-metallic diaphragms are prone to fatigue deformation or even tearing, reducing their service life.

[0011] (5) When the design pressure is extremely low, if a metal sealing membrane is used instead, it will be difficult to achieve low-pressure bursting due to the high strength of the metal material; if the bursting pressure is increased or a cooling and heat insulation device is added, the established process parameters will be destroyed and the operating cost will be increased.

[0012] Therefore, existing technologies cannot simultaneously handle the extreme working conditions of "high temperature (>260℃) + low pressure (<0.1MPa) + metal seal", resulting in a long-standing gap in the industry's selection process. Utility Model Content

[0013] The purpose of this invention is to provide a low-pressure rupture disc with a combination of groove and slit, in order to solve the problems mentioned in the background art, such as the inability of traditional rupture discs to adapt to high-temperature and low-pressure occasions, and the unsuitability of non-metallic materials for some special process media.

[0014] To achieve the above objectives, this utility model provides the following technical solution: a slotted and slit-combined low-pressure rupture disc, comprising a slit-type metal diaphragm, a slotted metal diaphragm, and a bracket assembly assembled from top to bottom by resistance welding; the slotted metal diaphragm includes an annular outer ring with an upwardly convex slit arch surface fixed to its inner ring, and multiple radial through-slits are machined on the slit arch surface; the slotted metal diaphragm includes an annular outer ring with a grooved diaphragm and an upwardly convex grooved arch surface fixed to its inner ring, and multiple weakening grooves are machined on the side of the grooved arch surface near the slit arch surface; the bracket assembly includes an annular outer ring with a bracket arch surface fixed to its inner ring, and a circumferential through-slit is machined at the root of the bracket arch surface near the inner ring of the outer ring, and multiple square support plates are uniformly welded and fixed below the circumferential through-slit.

[0015] Preferably, the radial through-slits are evenly distributed around the center of the slit arch surface, and one end of the radial through-slits near the center of the slit arch surface is provided with a through-slit stop hole, and the other end is stopped near the inner ring of the outer ring of the slit diaphragm; a short bridge is formed between two adjacent through-slit stop holes.

[0016] Preferably, the number of radial through slits is 4 to 10, and the width is 0.1 mm to 0.5 mm; the distance between the radial through slits and the inner ring of the outer ring of the slit diaphragm is 2 mm to 20 mm.

[0017] Preferably, the diameter of the through-hole is 1mm-10mm.

[0018] Preferably, the weakening grooves are evenly distributed in a radial ring along the grooved arch surface, and the number of them is 4-8. The cross-sectional shape of the weakening grooves is U-shaped or V-shaped, the top width is 3mm, and the maximum depth is not less than 1 / 4 of the thickness of the grooved metal diaphragm.

[0019] Preferably, the distance between the weakening groove and the inner ring support of the outer ring of the grooved diaphragm is equal to the distance between the radial through-slit and the inner ring of the outer ring of the slit diaphragm.

[0020] Preferably, the radial through-slit of the slotted metal diaphragm is staggered from the weakening groove of the grooved metal diaphragm and they must not overlap.

[0021] Preferably, the distance between the circumferential through-slit and the inner ring of the bracket outer ring is greater than the distance between the radial through-slit and the inner ring of the slit diaphragm outer ring.

[0022] Preferably, a portion of the circumferential through-slit is left unprocessed, with the angle of the unprocessed portion being 30°-60°; bracket stop holes are respectively processed at both ends of the circumferential through-slit, and the diameter of the bracket stop holes is 1mm-5mm.

[0023] Preferably, the spacing between the square trays is 10mm-30mm, and the circumferential through-slit is located at the center of the square tray.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] 1. By replacing the traditional non-metallic sealing membrane with a grooved metal diaphragm, the maximum working temperature of the rupture disc is increased from 260℃ to 530℃, completely solving the problem of not being able to select the right type for high-temperature and low-pressure conditions.

[0026] 2. The metal sealing surface is not affected by burrs, particles, or coal slag punctures, eliminating the hidden dangers of leakage and aging of non-metallic diaphragms, and greatly extending its service life.

[0027] 3. The slotted metal diaphragm is responsible for precisely controlling the burst pressure, while the grooved metal diaphragm only serves to seal and assist in rupture. Therefore, the requirements for groove depth accuracy are less stringent, and the processing difficulty and testing cost are significantly reduced.

[0028] 4. The all-metal structure has a small deformation range under alternating loads, can withstand high-frequency pulse pressure and back pressure fluctuations, is not prone to fatigue failure, and is suitable for working conditions such as compressor outlet and hydrogenation reactor.

[0029] 5. By selecting food-grade stainless steel or nickel-based alloys, it can meet the industry standards with extremely high hygiene requirements in food, pharmaceutical, and bio-fermentation industries.

[0030] 6. The rupture disc is a three-layer resistance welded composite component, which does not require additional cooling and heat insulation devices, does not change the original pipeline layout, and has the same installation space as traditional low-pressure rupture discs, making maintenance and replacement simple.

[0031] In summary, this invention achieves all-metallic, highly reliable, low-cost manufacturing and long-cycle operation of rupture discs under the extreme conditions of "high temperature + low pressure", filling a gap in the industry and having significant economic and social benefits. Attached Figure Description

[0032] Figure 1This is a schematic diagram of the present invention;

[0033] Figure 2 This is a top view of the present invention;

[0034] Figure 3 Top view of a slotted metal diaphragm;

[0035] Figure 4 Top view of a grooved metal diaphragm;

[0036] Figure 5 Top view of the bracket assembly;

[0037] In the diagram: 1. Slit-type metal diaphragm; 11. Slit-type diaphragm outer ring; 12. Slit-type arch surface; 13. Radial through-slit; 14. Through-slit stop hole; 15. Short bridge; 2. Grooved metal diaphragm; 21. Grooved diaphragm outer ring; 22. Grooved arch surface; 23. Weakening groove; 3. Bracket assembly; 31. Bracket outer ring; 32. Bracket arch surface; 33. Circumferential through-slit; 34. Square bracket; 35. Bracket stop hole. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.

[0039] Please refer to Figure 1-5 , Figure 1 This is a schematic diagram of the present invention; Figure 2 This is a top view of the present invention; Figure 3 Top view of a slotted metal diaphragm; Figure 4 Top view of a grooved metal diaphragm; Figure 5 Top view of the bracket assembly.

[0040] This utility model provides a low-pressure rupture disc with a combination of groove and slit, comprising a slit-type metal diaphragm 1, a grooved metal diaphragm 2, and a bracket assembly 3, which are assembled into a whole from top to bottom by resistance welding.

[0041] The slotted metal diaphragm 1 includes an annular slotted diaphragm outer ring 11. A convex slotted arch surface 12 is fixed to the inner ring of the slotted diaphragm outer ring 11. A plurality of radial through-slits 13 are machined on the slotted arch surface 12. The radial through-slits 13 are evenly distributed around the center of the slotted arch surface 12. One end of the radial through-slit 13 near the center of the slotted arch surface 12 is provided with a through-slit stop hole 14, and the other end is stopped near the inner ring of the slotted diaphragm outer ring 11. A short bridge 15 is formed between two adjacent through-slit stop holes 14. A grooved metal diaphragm 2 is located below the slotted metal diaphragm 1.

[0042] The grooved metal diaphragm 2 includes an annular grooved outer ring 21. An upwardly convex grooved arch surface 22 is fixed to the inner ring of the grooved outer ring 21. Multiple weakening grooves 23 are processed on the side of the grooved arch surface 22 near the slotted arch surface 12. The weakening grooves 23 are arranged radially along the grooved arch surface 22. Below the grooved metal diaphragm 2 is a bracket assembly 3.

[0043] The bracket assembly 3 includes an annular bracket outer ring 31, and a bracket arch surface 32 is fixedly connected to the inner ring of the bracket outer ring 31. A circumferential through-slit 33 is machined at the root of the bracket arch surface 32 near the inner ring of the bracket outer ring 31. At the same time, a plurality of square bracket plates 34 are uniformly welded and fixed below the circumferential through-slit 33.

[0044] The slotted metal diaphragm 1 and the bracket assembly 3 are both connected to the grooved metal diaphragm 2 by resistance welding. During assembly, the radial through slot 13 of the slotted metal diaphragm 1 and the weakening groove 23 of the grooved metal diaphragm 2 are staggered and must not overlap.

[0045] The number of radial through slits 13 is 4 to 10, and the width of the radial through slits 13 is 0.1 mm to 0.5 mm; the diameter of the through slit stop hole 14 is 1 mm to 10 mm; the distance between the radial through slits 13 and the inner ring of the outer ring 11 of the slit diaphragm is 2 mm to 20 mm.

[0046] The number of the weakening grooves 23 is 4-8, and they are evenly distributed around the center of the grooved arch surface 22.

[0047] The cross-sectional shape of the weakening groove 23 is U-shaped or V-shaped, with a top width of 3mm and a maximum depth not less than 1 / 4 of the thickness of the grooved metal diaphragm 2.

[0048] The distance between the weakening groove 23 and the inner ring support of the grooved diaphragm outer ring 21 is equal to the distance between the radial through-slit 13 and the inner ring of the slit diaphragm outer ring 11.

[0049] The distance between the circumferential through-slit 33 and the inner ring of the bracket outer ring 31 is greater than the distance between the radial through-slit 13 and the inner ring of the slit diaphragm outer ring 11; a portion of the circumferential through-slit 33 is left unprocessed, and the angle of the unprocessed portion is 30°-60°; bracket stop holes 35 are respectively processed at both ends of the circumferential through-slit 33, and the diameter of the bracket stop holes 35 is 1mm-5mm.

[0050] The spacing between the square trays 34 is 10mm-30mm, and the circumferential through-slit 33 is located at the center of the square trays 34.

[0051] This utility model provides a grooved and slotted combination low-pressure slotted rupture disc, in which the grooved metal diaphragm replaces the original non-metallic sealing material, increasing the maximum operating temperature of the low-pressure slotted rupture disc from 260℃ to 530℃. The original non-metallic sealing material is particularly prone to puncture by metal burrs, hard material particles, and slag, causing rupture disc leakage. Replacing it with the grooved metal diaphragm solves this problem. Since the slotted metal diaphragm controls the burst pressure, the grooved metal diaphragm does not have high burst pressure requirements and does not need strict control of the groove depth. The manufacturing process is relatively simple, while the positive arch grooved rupture disc, being a pressure control element, requires a more advanced manufacturing process and stricter control over the groove depth. When subjected to pulse pressure or back pressure, the grooved metal diaphragm is less prone to deformation or deformation, and is less likely to be damaged. The rupture disc is made entirely of metal, making it entirely food-grade and suitable for the food, pharmaceutical, and other industries. This invention effectively solves the problem of rupture disc selection under high temperature and low pressure conditions, filling the gap in rupture disc selection under extreme conditions.

[0052] 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 low-pressure slotted rupture disc with a combination of groove and slot, characterized in that: The assembly includes a slotted metal diaphragm (1), a grooved metal diaphragm (2), and a bracket assembly (3) assembled from top to bottom by resistance welding. The slotted metal diaphragm (1) includes an annular slotted diaphragm outer ring (11) with an upwardly convex slotted arch surface (12) fixed to its inner ring. The slotted arch surface (12) has multiple radial through-slits (13). The grooved metal diaphragm (2) includes an annular grooved diaphragm outer ring (21) with an upwardly convex slotted arch surface (12) fixed to its inner ring. A convex grooved arch surface (22) is provided, and multiple weakening grooves (23) are machined on the side of the slotted arch surface (12); the bracket assembly (3) includes an annular bracket outer ring (31) and a bracket arch surface (32) is fixed to its inner ring. A circumferential through-slit (33) is machined at the root of the bracket arch surface (32) near the inner ring of the bracket outer ring (31). Multiple square brackets (34) are uniformly welded and fixed below the circumferential through-slit (33).

2. The slotted and slit-combined low-pressure rupture disc according to claim 1, characterized in that: The radial through-slits (13) are evenly distributed around the center of the slit arch surface (12). One end of the radial through-slits (13) near the center of the slit arch surface (12) is provided with a through-slit stop hole (14), and the other end is stopped near the inner ring of the outer ring (11) of the slit diaphragm. There is a short bridge (15) between two adjacent through-slit stop holes (14).

3. The slotted and slit-combined low-pressure rupture disc according to claim 2, characterized in that: The number of radial through slits (13) is 4 to 10, and the width is 0.1 mm to 0.5 mm; the distance between the radial through slits (13) and the inner ring of the outer ring (11) of the slit diaphragm is 2 mm to 20 mm.

4. The slotted and slit-combined low-pressure rupture disc according to claim 3, characterized in that: The diameter of the through-hole (14) is 1mm-10mm.

5. The slotted and slit-combined low-pressure rupture disc according to claim 4, characterized in that: The weakening grooves (23) are evenly distributed in a radial ring along the grooved arch surface (22), and there are 4-8 of them. The cross-sectional shape of the weakening grooves (23) is U-shaped or V-shaped, the top width is 3mm, and the maximum depth shall not be less than 1 / 4 of the thickness of the grooved metal diaphragm (2).

6. The slotted and slit-combined low-pressure rupture disc according to claim 5, characterized in that: The distance between the weakening groove (23) and the inner ring support of the grooved diaphragm outer ring (21) is equal to the distance between the radial through slit (13) and the inner ring of the slit diaphragm outer ring (11).

7. The slotted and slit-combined low-pressure rupture disc according to claim 6, characterized in that: The radial through slit (13) of the slotted metal diaphragm (1) is offset from the weakening groove (23) of the grooved metal diaphragm (2) and must not overlap.

8. The slotted and slit-combined low-pressure rupture disc according to claim 7, characterized in that: The distance between the circumferential through-slit (33) and the inner ring of the bracket outer ring (31) is greater than the distance between the radial through-slit (13) and the inner ring of the slit diaphragm outer ring (11).

9. The slotted and slit-combined low-pressure rupture disc according to claim 8, characterized in that: The circumferential through-slit (33) has a portion that is not processed, and the angle of the unprocessed portion is 30°-60°; the two ends of the circumferential through-slit (33) are respectively processed with bracket stop holes (35), and the diameter of the bracket stop holes (35) is 1mm-5mm.

10. The slotted and slit-combined low-pressure rupture disc according to claim 9, characterized in that: The spacing between the square trays (34) is 10mm-30mm, and the circumferential through-slit (33) is located at the center of the square trays (34).

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