Small-bore piercing dual function rupture disc

Abstract

The utility model relates to a kind of small-bore puncture dual-function rupture disc, including clamping mechanism and rupture disc diaphragm, and rupture disc diaphragm is composed of arched working portion and edge clamping portion, and its technical key points are: clamping mechanism is composed of positive pressure side pressure ring and back pressure side pressure ring located at the edge clamping portion two sides of rupture disc diaphragm, the edge of positive pressure side pressure ring is provided with the annular edge of the outer ring surface of back pressure side pressure ring tight contact, positive pressure side pressure ring, rupture disc diaphragm and back pressure side pressure ring are concentrically arranged and are connected fixed using multiple sealing weld points, each sealing weld point is evenly arranged around the center line of rupture disc diaphragm, and the connecting pipeline in the side of back pressure side pressure ring is provided with puncture thimble assembly towards the center of rupture disc diaphragm.The utility model can realize overpressure positive blasting and controllable artificial pressure relief two functions in single compact structure, especially suitable for small-bore pipeline system, with the characteristics of high precision, high reliability, high sealing property.

Description

Technical Field

[0001] This utility model relates to the technical field of safety pressure relief devices, specifically to a small-diameter puncture dual-function rupture disc, which is particularly suitable for small-diameter (such as DN10-DN25) pipeline systems. Background Technology

[0002] A rupture disc is a disposable pressure-sensitive safety relief device widely used in pressure vessels and pipeline systems in the petroleum, chemical, aerospace, and pharmaceutical industries. When the system pressure exceeds a predetermined value, it can rupture rapidly to release pressure and protect the system safety.

[0003] In applications such as the charging and discharging pipelines of precision chemical instruments and semiconductor process equipment, the pipe diameters are typically small, and the pressure conditions are complex. A rupture disc needs to simultaneously fulfill two functions: one is to adapt to overpressure and positive pressure conditions caused by uncontrolled reactions, abnormal heating, etc.; the other is to adapt to conditions where pressure is applied instantaneously by human intervention under specific conditions.

[0004] The common solution currently is to install two independent devices in parallel: a positive pressure rupture disc and an electrically controlled valve. However, this solution has the following problems: it occupies a large space, has many interfaces, is costly, and the valve has the risk of leakage. For small-diameter piping systems with limited space, this solution is not feasible. Utility Model Content

[0005] The purpose of this invention is to provide a compact, small-diameter, dual-function rupture disc that can achieve both overpressure positive rupture and controllable artificial pressure relief within a single compact structure. It is particularly suitable for small-diameter pipeline systems and features high precision, high reliability, and high sealing performance.

[0006] The technical solution of this utility model is: A small-diameter puncture dual-function rupture disc includes a clamping mechanism and a rupture disc diaphragm. The rupture disc diaphragm consists of an arched working part and an edge clamping part. The key technical features are: the clamping mechanism consists of a positive pressure side ring and a back pressure side ring located on both sides of the edge clamping part of the rupture disc diaphragm; the edge of the positive pressure side ring has an annular edging that is in close contact with the outer ring surface of the back pressure side ring; the positive pressure side ring, the rupture disc diaphragm, and the back pressure side ring are concentrically arranged and connected and fixed by multiple sealing welds; each sealing weld is evenly arranged around the center line of the rupture disc diaphragm; and a puncture pin assembly facing the center of the rupture disc diaphragm is provided in the connecting pipe on the side where the back pressure side ring is located.

[0007] The aforementioned small-diameter puncture dual-function rupture disc includes a puncture pin assembly comprising a support base supported in a connecting pipeline and a pin located at the center of the inner end face of the support base. The tip of the pin is directly opposite a preset puncture point at the center of the rupture disc diaphragm, and the distance between the pin and the preset puncture point is 0.5 mm to 1 mm.

[0008] The aforementioned small-diameter puncture dual-function rupture disc has a diaphragm that is an arched metal sheet with its arched working part protruding toward the puncture pin assembly. The diameter of the arched working part ranges from DN10 to DN25.

[0009] In the aforementioned small-diameter puncture dual-function rupture disc, the ejector pin is a cemented carbide ejector pin or a tool steel ejector pin, and the ejector pin tip angle of the puncture ejector pin assembly is 30° to 60°.

[0010] The aforementioned small-diameter puncture dual-function rupture disc has an inner ring surface of the back pressure side pressure ring with a flange inner shape interface that mates with the port of the connecting pipeline, and the support seat edge of the puncture pin assembly has a relief groove corresponding to the flange inner shape interface to avoid interference with the movement of the pin towards the rupture disc diaphragm.

[0011] The beneficial effects of this utility model are: 1. Dual-function integration: One device simultaneously addresses both positive pressure and manual action safety relief needs, simplifying system design and reducing leakage points and installation space.

[0012] 2. Small diameter applicability: The unique center puncture design has a small force-bearing area and reliable operation, making it especially suitable for small diameter pipelines of DN10-DN25.

[0013] 3. High precision and high reliability: The positive bursting pressure is controlled by the thickness of the raw material, and the processing has little impact on the bursting pressure, resulting in high precision; the puncture is driven by external force to execute the puncture pin assembly, which is decisive and reliable, and the bursting / puncture pressure values ​​have small dispersion.

[0014] 4. Good sealing performance: The rupture disc diaphragm is firmly clamped to the positive pressure side ring and the back pressure side ring through annular edging and sealing welds, ensuring complete isolation and sealing on both sides of the rupture disc.

[0015] 5. Simple and compact structure: The overall structure has fewer parts, is easy to assemble, is easy to mass-produce, and has relatively low cost. Attached Figure Description

[0016] Figure 1 This is an axial cross-sectional schematic diagram of the present invention in use; Figure 2 yes Figure 1 Top view of the back pressure side pressure ring; Figure 3 yes Figure 1Schematic diagram of the structure of the rupture disc diaphragm; Figure 4 This is a schematic diagram of an externally driven puncture pin assembly puncturing the rupture disc diaphragm.

[0017] In the diagram: 1. Piercing pin assembly, 101. Pin, 2. Back pressure side pressure ring, 201. Flange inner interface, 3. Positive pressure side pressure ring, 301. Annular edging, 4. Rupture disc diaphragm, 5. Connecting pipeline, 6. Sealing weld. Detailed Implementation

[0018] The present invention will be described in detail with reference to the accompanying drawings.

[0019] like Figures 1-4 As shown, the small-diameter puncture dual-function rupture disc includes a clamping mechanism and a rupture disc diaphragm 4.

[0020] The rupture disc diaphragm 4 is a positively arched metal sheet, consisting of an arched working part and an edge clamping part. The clamping mechanism consists of a positive pressure side ring 3 and a back pressure side ring 2 located on both sides of the edge clamping part of the rupture disc diaphragm 4. The positive pressure side ring 3 and the back pressure side ring 3 are typically machined from high-strength stainless steel. The edge of the positive pressure side ring 3 is provided with an annular edging 301 that is in close contact with the outer ring surface of the back pressure side ring 2. The positive pressure side ring 3, the rupture disc diaphragm 4, and the back pressure side ring 2 are concentrically arranged and connected and fixed by multiple sealing welds 6, with each sealing weld 6 evenly arranged around the center line of the rupture disc diaphragm 4.

[0021] The connecting pipe 5 on the side where the back pressure ring 2 is located is provided with a piercing pin assembly 1 facing the center of the rupture disc diaphragm 4. In this embodiment, the piercing pin assembly 1 includes a support base supported in the connecting pipe 5 and a pin 101 located at the center of the inner end face of the support base. The arched working part of the rupture disc diaphragm 4 protrudes toward the pin 101 of the piercing pin assembly 1, and the diameter of the arched working part ranges from DN10 to DN25. The tip of the pin 101 is directly opposite the preset piercing point at the center of the arched working part, and the distance between the pin and the preset piercing point is 0.5 mm to 1 mm. The pin 101 is a carbide pin or a tool steel pin, such as one made of 316L stainless steel or INCONEL nickel. The tip angle of the pin 101 of the piercing pin assembly 1 is 30° to 60°.

[0022] The inner ring surface of the back pressure side pressure ring 2 is provided with a flange inner shape interface 201 that mates with the port of the connecting pipeline 5. The edge of the support seat of the puncture pin assembly 1 is provided with a relief groove corresponding to the flange inner shape interface 201 to avoid interfering with the movement of the pin towards the rupture disc diaphragm.

[0023] The rupture disc diaphragm 4 is the core actuating element of this device; its thickness and material are selected based on the design pressure. For example... Figure 3 As shown, on its surface facing P1 (positive pressure side), it is expanded by high-pressure compressed air. Under normal operating pressure, the diaphragm does not deform. When the overpressure reaches the set burst pressure, it ruptures and opens to release pressure.

[0024] During assembly, the rupture disc diaphragm 4 is placed between the positive pressure side pressure ring 3 and the back pressure side pressure ring 2. The back pressure side pressure ring 2 is then edge-wrapped using a mold, clamping and fixing its outer edge with an annular edging 301. Sealing welds are applied to the periphery to form a reliable metal seal. After the positive pressure side pressure ring 3, rupture disc diaphragm 4, and back pressure side pressure ring 2 are assembled, the back pressure side pressure ring 2 is connected and fixed to the back pressure side connecting pipe 5 via the flange inner interface 201. The puncture pin assembly 1 is installed in the back pressure side connecting pipe 5, with its driven end exposed, allowing manual operation to move it towards the rupture disc diaphragm 4. The back pressure side connecting pipe 5 also has a pressure relief branch (not shown in the figure).

[0025] Working principle: For positive overpressure conditions (P1 > P2), see [link / reference] Figure 1 When the system pressure increases, it acts on the rupture disc diaphragm 4. When the pressure reaches the rated value, the rupture disc diaphragm 4 ruptures instantaneously due to tensile deformation, and the gas is released from the rupture opening and then discharged through the pressure relief branch.

[0026] Intentional puncture, see Figure 4 When a force is applied to the support seat of the puncture pin assembly 1, the pin 101 is displaced beyond the distance between itself and the rupture disc 4. The hard tip of the pin 101 immediately punctures the preset puncture point at the center of the rupture disc 4, forming a perforation. The positive pressure side pressure P1 of the system is discharged to the pressure relief test P2, and the gas is discharged through the pressure relief branch.

[0027] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this utility model.

Claims

1. A small-diameter puncture dual-function rupture disc, comprising a clamping mechanism and a rupture disc diaphragm, wherein the rupture disc diaphragm is composed of an arched working part and an edge clamping part, characterized in that: The clamping mechanism consists of a positive pressure side ring and a back pressure side ring located on both sides of the edge clamping portion of the rupture disc diaphragm. The edge of the positive pressure side ring is provided with an annular edging that is in close contact with the outer ring surface of the back pressure side ring. The positive pressure side ring, the rupture disc diaphragm, and the back pressure side ring are arranged concentrically and connected and fixed by multiple sealing welds. Each sealing weld is evenly arranged around the center line of the rupture disc diaphragm. The connecting pipe on the side where the back pressure side ring is located is provided with a puncture pin assembly facing the center of the rupture disc diaphragm.

2. The small-diameter piercing dual-function rupture disc according to claim 1, characterized in that: The puncture pin assembly includes a support base supported in the connecting pipeline and a pin located at the center of the inner end face of the support base. The tip of the pin is directly opposite the preset puncture point at the center of the rupture disc diaphragm, and the distance between the pin and the preset puncture point is 0.5 mm to 1 mm.

3. The small-diameter piercing dual-function rupture disc according to claim 1, characterized in that: The rupture disc diaphragm is a positively arched metal sheet, with its arched working part protruding towards the ejector pin of the ejector pin assembly. The diameter of the arched working part ranges from DN10 to DN25.

4. The small-diameter piercing dual-function rupture disc according to claim 2 or 3, characterized in that: The ejector pin is a cemented carbide ejector pin or a tool steel ejector pin, and the tip angle of the ejector pin assembly is 30° to 60°.

5. The small-diameter piercing dual-function rupture disc according to claim 1, characterized in that: The inner ring surface of the back pressure side pressure ring is provided with a flange inner shape interface that mates with the port of the connecting pipeline, and the edge of the support seat of the puncture pin assembly is provided with a relief groove corresponding to the flange inner shape interface to avoid interfering with the movement of the pin towards the rupture disc diaphragm.

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