A type of inverted arched grooved rupture disc device

Abstract

This invention discloses a reverse-arched grooved rupture disc device, relating to the field of safe overpressure relief technology. It includes an inlet clamping ring, an outlet clamping ring, and a reverse-arched grooved rupture disc. The reverse-arched grooved rupture disc comprises a spherical crown pressure-bearing portion and a planar sealing portion connected to the spherical crown pressure-bearing portion, the planar sealing portion being located between the inlet clamping ring and the outlet clamping ring. Multiple radial grooves are formed on the concave side of the spherical crown pressure-bearing portion, distributed radially and extending to the planar sealing portion. This invention achieves full-bore rupture disc relief by designing the ratio of the spherical crown pressure-bearing portion to the arch diameter of the reverse-arched grooved rupture disc to 1 / 6 to 1 / 12, extending the ends of the radial grooves from the traditional spherical crown pressure-bearing portion to the planar sealing portion of the rupture disc, with the groove bottom thickness of the planar sealing portion increasing from the inside to the outside, and setting the number of radial grooves to no less than six. This ensures that the rupture disc releases pressure throughout its entire diameter, does not break or fragment after high-temperature erosion, and further guarantees precise control and normal opening of the rupture pressure of small-diameter, low-pressure rupture discs.

Description

Technical Field

[0001] This invention relates to the field of safe overpressure relief technology, specifically to a reverse arched grooved rupture disc device. Background Technology

[0002] The description of the background art in this invention pertains to related technologies and is used merely for illustration and to facilitate understanding of the invention. It should not be construed as the applicant explicitly believing or presuming that the invention was prior art on the filing date of the first application.

[0003] A rupture disc safety device is a non-re-closed pressure relief device consisting of a rupture disc and a clamp. It is typically installed on the flange of a pressure vessel's relief pipeline. When the pressure difference across the rupture disc reaches the burst pressure at a specified temperature, the disc immediately bursts to release pressure, ensuring the safety of personnel and equipment. It can also serve as a medium isolation and on / off element.

[0004] Rupture discs are classified into four categories based on their failure mode and material: positive arch, negative arch, flat plate, and graphite. Graphite-type rupture discs are mainly used in highly corrosive and low-pressure applications. Flat plate rupture discs have poorer overall performance and are mainly used in low-pressure and ultra-low-pressure conditions, especially in large silos. Positive arch and negative arch rupture discs have a wide range of applications. Compared to positive arch rupture discs, negative arch rupture discs have advantages such as better dynamic response, higher fatigue resistance, and higher working pressure. Reverse arch grooved rupture discs typically come in two types: with C-grooves and with cross-grooves (as shown in the attached diagram). Figure 1 and Figure 2 As shown, the inverted arch C-groove rupture disc is suitable for low and medium pressure applications, while the inverted arch cross-groove rupture disc is suitable for medium and high pressure applications.

[0005] In recent years, with the development of the domestic economy, especially the expansion into fields such as nuclear power, aerospace, aviation, and shipbuilding, more stringent requirements have been placed on rupture discs. For example, a certain project requires rupture discs smaller than DN80 for fuel isolation. When the system equipment is operating normally, the rupture disc acts as an isolation device. When the equipment needs to ignite, the front end is actively pressurized to the designed burst pressure of the rupture disc, causing it to rupture, forming a channel for ignition. This type of rupture disc requires a low room-temperature burst pressure (0.34 MPa), a higher reverse burst pressure than the forward burst pressure, high fatigue resistance, and importantly, it must withstand a 600-second gas erosion test at at least twice the room-temperature burst pressure without fracturing or fragmentation. According to the selection principles of rupture discs, only the inverted arched grooved rupture disc is closer to the actual working conditions. However, the existing inverted arched C-groove rupture discs cannot meet the requirements of no breakage, no fragmentation, and full-bore venting after high-temperature erosion tests. Traditional inverted arched cross-groove rupture discs also cannot meet the requirements of no breakage and no fragmentation after high-temperature erosion tests, and the rupture discs are not easy to open normally under small diameter and low pressure. For example, a nuclear power project requires large-diameter (DN500), medium- and high-pressure inverted arched grooved rupture discs, requiring full-bore venting after rupture, with no fragmentation or detachment. Conventional inverted arched cross-groove and inverted arched C-groove structures cannot meet these requirements.

[0006] Currently, most domestic rupture disc manufacturers use mechanical processing for groove processing, which has the advantage of low manufacturing cost. Chinese Patent Publication No. CN203082299U discloses a laser-processed C-shaped groove on a medium- and low-pressure flat rupture disc, with a U-shaped cross-section. While this method offers high engraving precision, it also presents challenges such as the rupture point existing across the entire engraved bottom plane, resulting in an uncertain rupture point and unpredictable interference with the rupture pressure. Summary of the Invention

[0007] The purpose of this invention is to provide a reverse-arched grooved rupture disc device to solve the problem that existing reverse-arched grooved rupture discs cannot meet the requirements of not breaking, not fragmenting, and releasing air through the entire bore after high-temperature erosion tests.

[0008] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0009] A reverse-arched grooved rupture disc device includes: an inlet clamping ring, an outlet clamping ring, and a reverse-arched grooved rupture disc. The reverse-arched grooved rupture disc is disposed between the inlet clamping ring and the outlet clamping ring. The reverse-arched grooved rupture disc includes a spherical crown pressure-bearing part and a planar sealing part connected to the spherical crown pressure-bearing part. The planar sealing part is located between the inlet clamping ring and the outlet clamping ring. The spherical crown pressure-bearing part is arched in the direction of the inlet clamping ring.

[0010] Multiple radial grooves are provided on the concave side of the spherical crown pressure bearing part. The radial grooves are distributed in a radial pattern and extend to the planar sealing part.

[0011] This invention extends from the traditional spherical crown pressure-bearing part to the rupture disc plane sealing part through the radial groove end. The thickness of the groove bottom of the plane sealing part increases from the inside to the outside. The number of radial grooves is set to be no less than six, so as to realize the full-bore venting of the rupture disc. It does not break or break after high temperature erosion. It can also further ensure the precise control of the burst pressure of small-diameter, low-pressure rupture discs and normal opening. Especially for special and valuable materials, it can save the trial production cycle and manufacturing cost.

[0012] Furthermore, the inlet clamping ring has an inner opening one and an inner opening two adjacent to the inner opening one, the inner opening two being located on the side close to the anti-arch groove-shaped bursting membrane;

[0013] The diameter of inner opening one is D1, the diameter of inner opening two is D2, the inlet clamping ring has a chamfer a and an outer diameter D11, the outlet clamping ring has an inner diameter D3, a chamfer b and an outer diameter D21, and the arching diameter of the inverted arched grooved rupture membrane is D4, the outer diameter D31 and a chamfer c. Furthermore, D1, D2, D11, D3, D21, D4, D31, a, b, and c satisfy: D4≥D3+2b, D1=D3, D2=D4, a=c, D11=D21=D31.

[0014] Furthermore, the height of the bearing part of the spherical crown is H, and H satisfies: H / D4 = 1 / 6 to 1 / 12.

[0015] This invention, through the design of the dimensions and proportions of the inlet clamping ring, the outlet clamping ring, and the anti-arch grooved rupture membrane, can effectively prevent the rupture disc from falling off during scouring, thereby preventing the generation of fragments.

[0016] Furthermore, the number of radial grooves is N, and the diameter of the circle formed by the ends of the N radial grooves is D5, and N and D5 satisfy: N≥6, D4+2c≤D5≤D4+2c+(D21-D4) / 4.

[0017] This invention designs the ratio of the spherical crown pressure-bearing part to the arch diameter of the inverted arched grooved rupture membrane to 1 / 6 to 1 / 12. The radial groove ends extend from the traditional spherical crown pressure-bearing part to the rupture membrane plane sealing part. The thickness of the groove bottom of the plane sealing part increases from the inside to the outside. The number of radial grooves is set to be no less than six to prevent the rupture disc from falling off during scouring or from generating fragments and falling off under high pressure. This achieves full-bore venting of the rupture disc and ensures that it does not break or break after high-temperature scouring.

[0018] Furthermore, the radial grooves are laser-processed, and the cross-section of the radial grooves is trapezoidal.

[0019] The radial groove of the present invention, by adopting a trapezoidal groove cross section, further ensures precise control of the burst pressure and normal opening of the small-diameter, low-pressure rupture disc.

[0020] Furthermore, the thickness of the inverted arch groove-shaped burst membrane is s, the distance between the concave center of the spherical crown pressure-bearing part and the adjacent groove edge is e, and s and e satisfy: 0.5s≤e≤3s.

[0021] Furthermore, the thickness of the groove bottom of the planar sealing part is h, and h gradually increases from the inside to the outside.

[0022] This invention, through the design of the anti-arch grooved rupture disc, ensures that the arch top will not rupture and leak prematurely under pressure, and that the rupture disc will fully open when the disc becomes unstable and overturns, thereby ensuring full-bore venting.

[0023] Furthermore, the inlet clamping ring, outlet clamping ring, and anti-arch grooved rupture membrane are all made of stainless steel, aluminum, or other special and precious materials.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The anti-arch grooved rupture disc device of the present invention can achieve full-bore venting, and the rupture disc does not break or produce fragments after high-temperature erosion. By designing the ratio of the height of the spherical crown pressure-bearing part of the rupture disc to the arch diameter to be 1 / 6 to 1 / 12, and extending the end of the radial groove from the traditional spherical crown forming part to the plane sealing part of the rupture disc, the thickness of the groove bottom of the plane sealing part increases from the inside to the outside, and the number of radial grooves is set to not less than six grooves, it can effectively prevent the rupture disc from falling off during erosion and prevent the generation of fragments, thereby achieving full-bore venting, and the rupture disc does not break or produce fragments after high-temperature erosion.

[0026] 2. The anti-arch grooved rupture disc device of the present invention has precise control over rupture pressure and normal opening for pressure relief after rupture. Since the radial groove is processed by laser, the thickness control accuracy of the groove bottom is better than that of mechanical processing. The radial groove adopts a trapezoidal cross section, which has better rupture pressure stability than a U-shaped cross section. In particular, it is more precise in controlling the rupture pressure of small-diameter, low-pressure rupture discs and allows for normal opening after rupture.

[0027] 3. The radial groove of the present invention is processed by laser, and its shape can be programmed arbitrarily as needed, without relying on molds, which is convenient, fast and saves manufacturing cycle; especially for special and expensive materials, it can save trial production cycle and manufacturing cost. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an anti-arch C-groove rupture disc in the prior art;

[0029] Figure 2 This is a schematic diagram of the structure of a reverse-arch cross-groove type rupture disc in the prior art;

[0030] Figure 3 This is a cross-sectional structural schematic diagram of an anti-arch grooved rupture disc device;

[0031] Figure 4 A top view of the concave side of the inverted arched grooved bursting membrane;

[0032] Figure 5 This is a schematic diagram of the radial groove cross-section.

[0033] In the figure: 1-Inlet clamping ring, 2-Outlet clamping ring, 3-Anti-arch grooved bursting membrane, 31-Spherical crown pressure bearing part, 32-Flat sealing part, 33-Radial groove. Detailed Implementation

[0034] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] like Figure 1 As shown, the upper part is the front view of an existing inverted arch C-groove rupture disc, and the lower part is the top view of an existing inverted arch C-groove rupture disc; as Figure 2 As shown, the upper part is the front view of the existing anti-arch cross-groove type rupture disc, and the lower part is the top view of the existing anti-arch cross-groove type rupture disc. The anti-arch C-groove type rupture disc is suitable for low-pressure and medium-pressure applications, while the anti-arch cross-groove type rupture disc is suitable for medium-pressure and high-pressure applications.

[0036] like Figures 3 to 5 As shown, the present invention provides a reverse-arched grooved rupture disc device, comprising: an inlet clamping ring 1, an outlet clamping ring 2, and a reverse-arched grooved rupture disc 3. The reverse-arched grooved rupture disc 3 is disposed between the inlet clamping ring 1 and the outlet clamping ring 2. In this embodiment, the inlet clamping ring 1, the outlet clamping ring 2, and the reverse-arched grooved rupture disc 3 are fixedly connected by welding. In other embodiments of the present invention, the inlet clamping ring 1, the outlet clamping ring 2, and the reverse-arched grooved rupture disc 3 can be connected by bolts. Compared with bolt connection, the welding method in this embodiment reduces the overall weight of the rupture disc and improves the sealing performance between the reverse-arched grooved rupture disc 3 and the inlet clamping ring 1 and the outlet clamping ring 2.

[0037] The anti-arched grooved rupture membrane 3 includes a spherical crown pressure-bearing part 31 and a planar sealing part 32 connected to the spherical crown pressure-bearing part 31. The planar sealing part 32 is located between the inlet clamping ring 1 and the outlet clamping ring 2. The spherical crown pressure-bearing part 31 is anti-arched along the direction of the inlet clamping ring 1. Multiple radial grooves 33 are opened on the concave side of the spherical crown pressure-bearing part 31. The radial grooves 33 are distributed in a radial pattern and extend to the planar sealing part 32. Taking the system pressure entering from one side of the inlet clamping ring 1 as an example: During normal operation, the inverted arched grooved rupture disc 3 of the inverted arched grooved rupture disc device plays a sealing and isolation role; when the equipment needs to be ignited, when the front end is actively pressurized to the design burst pressure of the rupture disc 3, the spherical crown pressure-bearing part 31 of the rupture disc 3 will rupture rapidly within a millisecond response time, and a through flow channel is formed between the inlet clamping ring 1, the outlet clamping ring 2, and the inverted arched grooved rupture disc 3, realizing full-bore venting, without rupture or fragmentation, the fuel can pass smoothly, and ignition is achieved; if conventional inverted arched cross-shaped grooves and inverted arched C-groove type rupture discs are used, the requirements of full-bore venting, no fragmentation, and no detachment cannot be met.

[0038] The inlet clamping ring 1 has an inner opening 11 and an inner opening 2 12 adjacent to the inner opening 11. The inner opening 2 12 is located on the side close to the anti-arched grooved rupture membrane 3. The diameter of the inner opening 11 is D1, the diameter of the inner opening 2 12 is D2, the arc chamfer of the inlet clamping ring 1 is a, and the outer diameter is D11. The inner diameter of the outlet clamping ring 2 is D3, the arc chamfer is b, and the outer diameter is D21. The arching diameter of the anti-arched grooved rupture membrane 3 is D4, the outer diameter is D31, and the arc chamfer is c. D1, D2, D11, D3, D21, D4, D31, a, b, and c satisfy: D4≥D3+2b, D1=D3, D2=D4, a=c, and D11=D21=D31.

[0039] The height of the spherical crown bearing part 31 is H, and H satisfies: H / D4=1 / 6~1 / 12.

[0040] The number of radial grooves 33 is N, and the diameter of the circle formed by the ends of the N radial grooves 33 is D5, and N and D5 satisfy: N≥6, D4+2c≤D5≤D4+2c+(D21-D4) / 4. In this invention, the number of radial grooves 33 is greater than or equal to 6. In this embodiment, there are 6 radial grooves 33. The radial grooves 33 are laser-processed, and the cross-section of the radial grooves 33 is trapezoidal. Using laser processing to process the radial grooves 33 makes the bottom thickness control accuracy of the radial grooves 33 better than that of mechanical processing. The trapezoidal cross-section of the radial grooves 33 has better stability of burst pressure than that of U-shaped cross-section; at the same time, it has higher pressure accuracy for burst pressure relief at low pressure.

[0041] The thickness of the inverted arched grooved burst membrane 3 is s, and the distance between the concave center of the spherical crown pressure-bearing part 31 and the adjacent groove edge is e, and s and e satisfy: 0.5s≤e≤3s. The thickness of the groove bottom of the planar sealing part 32 is h, and h gradually increases from the inside to the outside.

[0042] The inlet clamping ring 1 has an inner opening diameter of 11 (D1 = ￠40mm), an inner opening diameter of 13 (D2 = ￠42mm), a chamfer of a = R1, and an outer diameter of D11 = ￠68mm. The outlet clamping ring 2 has an inner opening diameter of D3 = ￠40mm, a chamfer of b = R1, and an outer diameter of D21 = ￠68mm. The arched diameter of the inverted arched grooved rupture membrane 3 is D4 = ￠42mm, a chamfer of c = R1, and an outer diameter of D31 = ￠68mm. The spherical crown pressure-bearing part 31 has a height of H = 5mm. The inverted arched grooved rupture membrane 3 has six radial grooves 33, and the diameter of the circle formed by the ends of the six radial grooves 33 is D5 = ￠48mm. The thickness of the inverted arched grooved rupture membrane 3 is s = 0.12 mm, the bottom thickness of the groove of the planar sealing part 32 is h = 0.03~0.05 mm, and the distance between the center of the concave side of the spherical crown pressure-bearing part 31 and the adjacent groove edge is e = 0.8 mm. The bottom thickness of the groove of the planar sealing part 32 is h = 0.03~0.05 mm, increasing from the inside to the outside to h = 0.05~0.12 mm.

[0043] Preferably, the inlet clamping ring 1, the outlet clamping ring 2, and the anti-arch grooved rupture membrane 3 are all made of stainless steel, aluminum, or special precious materials.

[0044] The anti-arch grooved rupture disc device of the present invention, by designing the ratio of the height of the spherical crown pressure-bearing part 31 to the arch diameter of the anti-arch grooved rupture disc 3 to be 1 / 6 to 1 / 12, and the end of the radial groove 33 extending from the conventional spherical crown pressure-bearing part 31 to the planar sealing part 32 of the anti-arch grooved rupture disc 3, the thickness of the bottom of the planar sealing part 32 increases from the inside to the outside, and the number of radial grooves 33 is set to not less than six grooves, so that the arch top of the anti-arch grooved rupture disc 3 will not rupture and leak prematurely when under pressure, and can ensure that the rupture disc is fully opened when it is unstable and overturned, ensuring full-bore venting, effectively preventing the rupture disc from falling off during scouring and preventing the generation of fragments, thereby meeting the requirements of no breakage, no fragments, and full-bore venting after high-temperature scouring.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reverse-arched grooved rupture disc device, comprising: An inlet clamping ring (1), an outlet clamping ring (2), and an anti-arched grooved rupture membrane (3) are provided between the inlet clamping ring (1) and the outlet clamping ring (2). The anti-arched grooved rupture membrane (3) includes a spherical crown pressure-bearing part (31) and a planar sealing part (32) connected to the spherical crown pressure-bearing part (31). The planar sealing part (32) is located between the inlet clamping ring (1) and the outlet clamping ring (2). The spherical crown pressure-bearing part (31) is anti-arched along the direction of the inlet clamping ring (1). The concave side of the spherical crown pressure-bearing part (31) has multiple radial grooves (33), which are radially distributed and extend to the planar sealing part (32); the height of the spherical crown pressure-bearing part (31) is H, and H satisfies: H / D4 = 1 / 6 to 1 / 12; the number of radial grooves (33) is N, and the diameter of the circle formed by the ends of the N radial grooves (33) is D5, and N and D5 satisfy: N ≥ 6, D4 + 2c ≤ D5 ≤D4+2c+(D21-D4) / 4; The bottom thickness of the groove of the planar sealing part (32) is h, and h gradually increases from the inside to the outside; The radial groove (33) is laser-processed, and the cross section of the radial groove (33) is trapezoidal; The inlet clamping ring (1) has an inner opening one (11) and an inner opening two (12) adjacent to the inner opening one (11), and the inner opening two (12) is located on the side close to the anti-arch grooved bursting membrane (3); The diameter of the inner opening one (11) is D1, the diameter of the inner opening two (12) is D2, the arc chamfer of the inlet clamping ring (1) is a, the outer diameter is D11, the inner diameter of the outlet clamping ring (2) is D3, the arc chamfer is b, the outer diameter is D21, the arching diameter of the anti-arch grooved bursting membrane (3) is D4, the outer diameter is D31, the arc chamfer is c, and D1, D2, D11, D3, D21, D4, D31, a, b, c satisfy: D4≥D3+2b, D1=D3, D2=D4, a=c, D11=D21=D31.

2. The anti-arch grooved rupture disc device according to claim 1, characterized in that, The thickness of the anti-arch grooved burst membrane (3) is s, and the distance between the concave center of the spherical crown pressure-bearing part (31) and the adjacent groove edge is e, and s and e satisfy: 0.5s≤e≤3s.

3. The anti-arch grooved rupture disc device according to claim 1, characterized in that, The inlet clamping ring (1), the outlet clamping ring (2), and the anti-arch grooved rupture membrane (3) are all made of stainless steel and aluminum.

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