A micro-pressure rupture disc

Abstract

The application provides a micro-pressure slitted rupture disc, which comprises a lower reinforcing ring, a lower rupture membrane assembly, a lower protective film, a sealing film, an upper protective film, an upper rupture membrane assembly and an upper reinforcing ring which are overlapped from bottom to top; the lower rupture membrane assembly comprises a diaphragm I and a diaphragm II; the diaphragm II comprises a first circular hole in the center, a plurality of groups of outward emission-shaped second pressure relief slits are uniformly arranged around the first circular hole on the diaphragm II, and the end of the second pressure relief slit is provided with a stop hole; the diaphragm I is a pressure-sensitive element with a circular plate structure, is coaxially fixedly installed on the upper panel of the diaphragm II, a plurality of first pressure relief slits which are close to the center of the circle and correspond to the second pressure relief slits are uniformly arranged on the diaphragm I, and a burst hole is arranged at the end of the first pressure relief slit close to the center of the circle; the upper rupture assembly is consistent with the lower rupture assembly in structure. Through the above arrangement, the application realizes accurate control of the burst pressure of the rupture disc, has good rigidity, high reliability and can realize the requirements of forward and reverse burst.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of safe overpressure relief, in particular to a micro-pressure slotted bursting disc. BACKGROUND

[0002] In recent years, with the increasing demand for strict safety supervision, the number of bursting discs set in micro-pressure occasions of pressure vessels is increasing. The currently produced bursting discs in China can only select ordinary slotted bursting discs for medium and large diameter, liquid medium and low pressure occasions. The through slit is adopted, as shown in the specification attached Figure 2 , or two-section slit structure bursting disc, such as Chinese patent No. CN206072456 U.

[0003] The above two prior arts have the following problems: for micro-pressure occasions with diameter ≥ DN300 and bursting pressure <0.005MPa, due to the limitation of material strength, the selected bursting membrane is not only thin in thickness, but also small in bursting hole distance, resulting in high manufacturing difficulty, uncontrolled bursting pressure value, damaged membrane during assembly and disassembly, and safety hazards to production and personnel. SUMMARY

[0004] The present application is proposed to solve the above-mentioned problems of the prior art, and provides a micro-pressure slotted bursting disc. By setting the structure of the lower reinforcing ring, the lower bursting membrane assembly, the lower protective film, the sealing film, the upper protective film, the upper bursting membrane assembly and the upper reinforcing ring, the bursting pressure of the bursting disc is precisely controlled, the rigidity is good, the reliability is high, and the needs of forward and reverse bursting can be realized.

[0005] The present application is implemented as follows:

[0006] The present application provides a micro-pressure slotted bursting disc, which comprises a lower reinforcing ring, a lower bursting membrane assembly, a lower protective film, a sealing film, an upper protective film, an upper bursting membrane assembly and an upper reinforcing ring overlapped from bottom to top.

[0007] The lower bursting membrane assembly comprises a disc I and a disc II, the disc II is a circular ring sheet structure comprising a first circular hole in the center, a plurality of groups of outward emission-like second pressure relief slits are uniformly arranged around the first circular hole on the disc II, and the end of the second pressure relief slit is provided with a stop hole.

[0008] The disc I is a pressure sensitive element in a circular sheet structure, coaxially fixedly installed on the upper panel of the disc II, and the diameter D3 of the disc I is greater than the diameter D4 of the first circular hole and less than the diameter D5 of the circle formed by the stop hole on the disc II; a first pressure relief slit close to the center of the circle is uniformly arranged on the disc I corresponding to the second pressure relief slit, and a bursting hole is arranged at one end of the first pressure relief slit close to the center of the circle.

[0009] The upper bursting assembly is consistent with the structure of the lower bursting assembly.

[0010] In order to better realize the present application, further, the lower protective film is in a circular sheet structure, comprising a third pressure relief slit and a plurality of fourth pressure relief slits; the third pressure relief slit is a non-closed circle with a diameter D8, and the fourth pressure relief slits are evenly arranged outward around the third pressure relief slit;

[0011] The diameter D8 of the third pressure relief slit is greater than the diameter D3 of the diaphragm I;

[0012] The fourth pressure relief slit forms a circle with a diameter D9 at its outer end point, and the diameter D9 is less than the diameter D5;

[0013] And D4 ≥ D3-20, D5 / 2 > D3 > D5 / 4;

[0014] The lower protective film and the upper protective film are of the same structure.

[0015] In order to better realize the present application, further, the thickness of the diaphragm I is S1, and the thickness of the diaphragm II is S2, and 2S1 ≤ S2.

[0016] In order to better realize the present application, further, the number of the fourth pressure relief slits corresponds to the number of the second pressure relief slits, and the slits do not coincide.

[0017] In order to better realize the present application, further, the angle between every two fourth pressure relief slits is a, and the two end points of the non-closed circle of the third pressure relief slit are respectively connected with the end points of two adjacent fourth pressure relief slits.

[0018] In order to better realize the present application, further, the diaphragm I and the diaphragm II are connected by spot welding or adhesive bonding;

[0019] When the connection is by spot welding, corresponding welding spots are respectively arranged on the diaphragm I and the diaphragm II; the number of the welding spots is N1; the diameter of the welding spot on the diaphragm I is D6, the diameter of the welding spot on the diaphragm II is D7, the diameter D6 = (D3+D4) / 2; D7 = ￠1.5~￠2 mm; the number N1 of the welding spots ≥ π*D6 / Y; Y is a certain fixed value within 4~8 mm, and the specific value is selected according to actual needs.

[0020] In order to better realize the present application, further, the number of the first pressure relief slit is N3, the angle a ≤ 360 / N3 mm, the diameter D8 ≥ D3+X mm, and the diameter D9 ≤ D5-X mm, wherein X is a certain fixed value within the range of 10~20 mm, and the specific value is selected according to actual needs.

[0021] In order to better realize the present application, further, the lower reinforcing ring and the upper reinforcing ring are respectively provided with inner ports I and II in the center; the diameter of the inner port I is D1, the diameter of the inner port II is D2, the diameter D1=D2=D5+Z, the Z is a certain determined value in the range of 3-5 mm, and the specific selection is determined according to actual requirements.

[0022] In order to better realize the present application, further, the upper surface of the lower reinforcing ring and the lower surface of the upper reinforcing ring are respectively provided with sealing surfaces I and II.

[0023] In order to better realize the present application, further, the lower reinforcing ring and the upper reinforcing ring adopt a tetrafluoro material; the lower protective film, the upper protective film and the sealing film adopt a polytetrafluoroethylene or polyperfluoroethylene material.

[0024] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0025] (1) The explosion pressure control is accurate. Since the thickness of the membrane for controlling the explosion pressure is thinner than that of the ordinary type of membrane, the explosion hole distance will be larger than that of the ordinary type, and the pressure dispersed on the unit area will be smaller, and the pressure control will be more accurate;

[0026] (2) The rigidity is good, and the reliability is high. Since the thickness of the membrane I is at least 1 times thicker than that of the membrane II for controlling the explosion pressure, the overall rigidity of the rupture disc is better than that of the ordinary type, and the membrane is not prone to be damaged during the installation and removal, thereby avoiding product failure;

[0027] (3) The forward and reverse explosion can be realized. Since the upper and lower explosion membrane assemblies have the same structure, the forward and reverse explosion pressure values are consistent. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a main sectional view of the present application rupture disc;

[0029] Figure 2 It is a schematic diagram of the prior art rupture disc;

[0030] Figure 3 It is a top view of the lower explosion membrane assembly;

[0031] Figure 4 It is a schematic diagram of the membrane I;

[0032] Figure 5 It is a schematic diagram of the structure of the membrane II;

[0033] Figure 6 It is a schematic diagram of the structure of the lower protective film 3.

[0034] Wherein: 1, the lower reinforcing ring, 2, the lower burst membrane assembly, 3, the lower protective film, 4, the sealing film, 5, the upper protective film, 6, the upper burst membrane assembly, 7, the upper reinforcing ring, 8, the welding point, 11, the sealing surface I, 12, the inner port I, 21, the diaphragm I, 211, the burst hole, 212 the first pressure relief slit, 22, the diaphragm II, 221, the second pressure relief slit, 222, the cutoff hole, 223, the first circular hole, 71, the sealing surface II, 72, the inner port II, 31, the third pressure relief slit, 32, the fourth pressure relief slit. DETAILED DESCRIPTION

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be understood that the described embodiments are only a part of the embodiments of the present application, not all the embodiments, and therefore should not be regarded as limiting the scope of protection. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "arranged", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] Embodiment 1:

[0038] The present embodiment proposes a micro-pressure slotted burst disc, as shown in Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 , which comprises, from bottom to top, a lower reinforcing ring 1, a lower burst membrane assembly 2, a lower protective film 3, a sealing film 4, an upper protective film 5, an upper burst membrane assembly 6, and an upper reinforcing ring 7.

[0039] The lower burst membrane assembly 2 comprises a diaphragm I 21 and a diaphragm II 22, the diaphragm II 22 is a circular ring sheet structure, comprising a first circular hole 223 in the center, a plurality of groups of outwardly radiating second pressure relief slits 221 are uniformly arranged around the first circular hole 223 on the diaphragm II 22, and the ends of the second pressure relief slits 221 are provided with cutoff holes 222.

[0040] The diaphragm I 21 is a pressure sensitive element with a circular plate structure, is coaxially fixedly installed on the upper panel of the diaphragm II 22, and the diameter D3 of the diaphragm I 21 is greater than the diameter D4 of the first circular hole 223 and less than the diameter D5 of the circle formed by the cutoff hole 222 of the diaphragm II 22; the diaphragm I 21 is uniformly provided with the first pressure relief slit 212 close to the center of the circle corresponding to the second pressure relief slit 221, and the burst hole 211 is arranged at one end of the first pressure relief slit 212 close to the center of the circle.

[0041] The upper burst assembly 6 is consistent with the structure of the lower burst assembly 2.

[0042] The sealing surface I 11 and the sealing surface II 71 have good smoothness and parallelism, and play a role in strengthening rigidity and ensuring good sealing effect when the burst disc is connected with the holder or the flange.

[0043] The lower reinforcing ring 1 has an inner port I 12, the upper reinforcing ring 7 has an inner port II 72, the inner port I 12 has a caliber D1, the inner port II 72 has a caliber D2, the diaphragm I 21 has an outer diameter D3 and a thickness S1, the diaphragm II 22 has an inner diameter D4 and a cutoff hole with an outer diameter D5 and a thickness S2, and D1, D2, D3, D4, D5, S1 and S2 satisfy the following relationships: D1=D2=D5+(3-5), D5 / 2>D3>D5 / 4, D4≥D3-20, and 2S1≤S2.

[0044] The center diameter of the welding point 8 of the diaphragm I 21 and the diaphragm II 22 is D6, the welding point diameter is D7, and the number of welding points is N1, and D6, D7 and N1 satisfy the following relationships: D6=(D3+D4) / 2, D7=￠1.5-￠2, and N1≥ π*D6 / 4-8.

[0045] The third pressure relief slit 31 is arranged at the center of the lower protective film 3, and the lower protective film 3 has six fourth pressure relief slits 32 arranged at the waist thereof, which have the same number as the second pressure relief slits 221 of the diaphragm II 22. The diameter of the third pressure relief slit 31 of the lower protective film 3 is D8, the included angle of the fourth pressure relief slit 32 is a, the diameter of the end is D9, and the number is N2. The following relationships are satisfied: a≤360 / N3, D8≥D3+10-20, D9≤D5-10-20, N2=N3, and N3 is the number of the second pressure relief slit 212. The fourth pressure relief slit 32 is arranged staggered with the second pressure relief slit 221. Since two of the fourth pressure relief slits 32 are arranged at the two ends of the third pressure relief slit 31, and the six fourth pressure relief slits 32 are evenly distributed on the third pressure relief slit 31, when the circle formed by the third pressure relief slit 31 is large enough, such as 300°, the six fourth pressure relief slits 32 can be evenly distributed within 360°, and when the circle formed by the third pressure relief slit 31 is less than 300°, the angle a formed by the two fourth pressure relief slits 32 is less than 60° when the six fourth pressure relief slits 32 are evenly distributed on the third pressure relief slit 31.

[0046] The upper protective film 5 has the same structure as the lower protective film 3. The lower protective film 3 and the upper protective film 5 are not sealed and do not bear pressure, and the function is to prevent the damage of the blade burr and the welding burr at the slit of the rupture disc assembly to the sealing film.

[0047] Preferably, the lower reinforcing ring 1 and the upper reinforcing ring 7 are made of a fluorine material, and the lower protective film 3, the upper protective film 5, and the sealing film 4 are made of polytetrafluoroethylene or polytetrafluoroethylene-propylene material.

[0048] Working principle: taking the system pressure entering from the lower reinforcing ring 1 as an example: when the equipment is over-pressurized, the sealing film 4 of the rupture disc plays a sealing role. When the equipment is over-pressurized, the diaphragm I 21 and the diaphragm II 22 of the upper rupture disc assembly 6 will deform with the increase of pressure until the material reaches the tensile limit and breaks, and the sealing film 4 will also stretch and deform until it bursts. When the equipment is over-pressurized, the sealing film 4 bursts between the inner hole I of the lower reinforcing ring 1, the burst hole 211 of the diaphragm I 21 of the lower rupture disc assembly 2, the lower protective film 3, the upper protective film 5, the burst hole 211 of the diaphragm I 21 of the upper rupture disc assembly 6, and the inner hole II of the upper reinforcing ring 7, forming a through flow channel, and releasing the pressure to protect the equipment and personal safety.

[0049] Example 2:

[0050] The lower rupture disc assembly 2 is provided with six first pressure relief slits 212 and second pressure relief slits 221, the inner opening I 11 of the lower reinforcing ring 1 has a diameter D1 = ￠305 mm, the inner opening II 71 of the upper reinforcing ring 7 has a diameter D2 = ￠305 mm, the diaphragm I 11 has an outer diameter D3 = ￠120 mm and a thickness S1 = 0.05 mm, the diaphragm II 22 has an inner diameter D4 = ￠100 mm, an outer diameter of the stop hole D5 = ￠300 mm, a thickness S2 = 0.1 mm, a center diameter of the welding spot D6 = ￠110 mm, a diameter of the welding spot D7 = ￠1.5 mm, N1 = 60, the third pressure relief slit 31 has a diameter D8 = ￠140, the fourth pressure relief slit 32 has an angle a = 60° and a diameter D9 = ￠290, N2 = 6, and the fourth pressure relief slit 32 is arranged at an angle of 30° with the second pressure relief slit 221.

[0051] The other parts of the embodiment are the same as those of the above-mentioned embodiment 1, and thus will not be described again.

[0052] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change based on the technical essence of the present application to the above embodiment falls within the protection scope of the present application.

Claims

1. A micro-pressure cracking type bursting disc, characterized in that: It comprises a lower reinforcement ring (1), a lower bursting membrane assembly (2), a lower protective membrane (3), a sealing membrane (4), an upper protective membrane (5), an upper bursting membrane assembly (6), and an upper reinforcement ring (7) which are overlapped in sequence from bottom to top; The lower bursting membrane assembly (2) includes a membrane I (21) and a membrane II (22), wherein the membrane II (22) is a circular sheet structure, including a first circular hole (223) located in the center, and a plurality of groups of outwardly radiating second pressure relief slits (221) are evenly arranged around the first circular hole (223) on the membrane II (22), and a cut-off hole (222) is provided at the end of the second pressure relief slit (221); The diaphragm I (21) is a pressure sensitive element with a circular structure, which is coaxially fixed on the upper panel of the diaphragm II (22), and the diameter D3 of the diaphragm I (21) is larger than the diameter D4 of the first circular hole (223) and smaller than the diameter D5 of the circle formed by the cut-off hole (222) on the diaphragm II (22); the diaphragm I (21) is evenly provided with first pressure relief slits (212) corresponding to the second pressure relief slits (221) and close to the center of the circle, and a blasting hole (211) is provided at one end of the first pressure relief slit (212) close to the center of the circle; the lower protective membrane (3) includes a third pressure relief slit (31) and a fourth pressure relief slit (32), the third pressure relief slit (31) is provided at the center of the lower protective membrane (3), and six fourth pressure relief slits (32) are provided at the waist of the lower protective membrane (3), the same number as the second pressure relief slits (221) of the diaphragm II (22); The upper bursting membrane assembly (6) has the same structure as the lower bursting membrane assembly (2); the thickness of the membrane I (21) is S1, the thickness of the membrane II (22) is S2, and 2S1 ≤ S2; The lower protective film (3) is a disc-shaped structure; the third pressure relief seam (31) is a non-closed circle with a diameter of D8; the fourth pressure relief seam (32) is uniformly arranged around the third pressure relief seam (31) and diverges outward; The diameter D8 of the third pressure relief seam (31) is greater than the diameter D3 of the diaphragm I (21); The diameter of the circle formed by the outer end points of the fourth pressure relief seam (32) is D9, and the diameter D9 is smaller than the diameter D5; And the diameter D4 ≥ D3-20, D5 / 2> D3> D5 / 4; The lower protective film (3) and the upper protective film (5) have the same structure; The number of the fourth pressure relief slits (32) corresponds to the number of the second pressure relief slits (221), and the gaps between the two slits do not overlap.

2. A micro-pressure crack-type bursting disc according to claim 1, characterized in that: The included angle between each two fourth pressure relief slits (32) is angle a, and the two end points of the unclosed circle of the third pressure relief slit (31) are respectively connected to the end points of two adjacent fourth pressure relief slits (32).

3. A micro-pressure crack-type bursting disc according to claim 1, characterized in that: The diaphragm I (21) and the diaphragm II (22) are connected by spot welding or bonding; When spot welding is used, corresponding welding spots (8) are respectively provided on the diaphragm I (21) and the diaphragm II (22); the number of the welding spots (8) is N1; the diameter of the welding spot (8) on the diaphragm I (21) is D6, and the diameter of the welding spot (8) on the diaphragm II (22) is D7, wherein the diameter D6 = (D3+D4) / 2; D7 = Φ1.5 to Φ2 mm; the number of welding spots N1 ≥ π*D6 / Y; wherein Y is a fixed value within the range of 4 to 8 mm, and a specific value is selected according to actual needs.

4. A micro-pressure crack-type bursting disc according to claim 2, characterized in that: The number of the first pressure relief seams (212) is N3, the angle a ≤ 360 / N3 mm, the diameter D8 ≥ D3+X mm, and the diameter D9 ≤ D5-X mm, wherein X is a fixed value within the range of 10 to 20 mm, and a specific value is selected according to actual needs.

5. A micro-pressure crack-type bursting disc according to claim 1, characterized in that: The lower reinforcing ring (1) and the upper reinforcing ring (7) respectively have an inner opening I (12) and an inner opening II (72) arranged in the center; the diameter of the inner opening I (12) is D1, the diameter of the inner opening II (72) is D2, and the diameter D1=D2=D5+Z, wherein Z is a certain value within the range of 3 to 5 mm, and the specific selection is determined according to actual needs.

6. A micro-pressure crack-type bursting disc according to claim 1, characterized in that: The upper surface of the lower reinforcement ring (1) and the lower surface of the upper reinforcement ring (7) are respectively provided with a sealing surface I (11) and a sealing surface II (71).

7. A micro-pressure crack-type bursting disc according to claim 1, characterized in that: The lower reinforcement ring (1) and the upper reinforcement ring (7) are made of tetrafluoroethylene material; the lower protective film (3), the upper protective film (5) and the sealing film (4) are made of polytetrafluoroethylene or polytetrafluoroethylene propylene material.

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