Reinforcement structure for high strength impact resistant necked butt flange

Abstract

The utility model provides high strength anti -impact neck butt -welding flange's reinforcing structure relates to flange structure field for pipeline connection, including annular flange plate, the inside of annular flane plate top end face is ring array and is equipped with the welding connecting hole, the top of welding connecting hole is cylindrical, the bottom is frustum, and the annular flange plate top is welded with the neck connecting cylinder, and the welding connecting column of annular array on the bottom end face of neck connecting cylinder is inserted in the welding connecting hole and is welded, the annular flange plate of high strength anti -impact neck butt -welding flange's reinforcing structure adopts the adaptive insertion structure of frustum welding connecting hole and welding connecting column with neck connecting cylinder, and cooperates the welding groove formed by welding reinforcement groove and welding reinforcement groove, and the welding contact area and the molten pool accommodation space are increased greatly, welding defects are reduced, the joint of both is more full, effectively avoids the cracking and falling of welding position when being impacted or vibrating, to solve the problem that the welding strength of neck butt -welding flange is weak, and the impact resistance is poor.

Description

Technical Field

[0001] This utility model relates to the technical field of flange structures for pipeline connections, and in particular to the reinforced structure of high-strength, impact-resistant weld neck flanges. Background Technology

[0002] Weld neck flanges are important connecting components in pipeline systems and are widely used in industries such as petroleum, chemical, metallurgy, and power. They achieve a fixed connection by welding the neck to the pipeline, and the flanges are sealed by bolts. Existing weld neck flanges often use simple flat-surface welding between the annular flange and the neck connecting tube. The welding contact area is small and the space for the molten pool is limited, which makes the connection strength weak due to welding defects. In addition, the bottom of the neck connecting tube often has stress concentration due to improper structural design. When subjected to impact, vibration or medium pressure, the welded part is prone to cracking and falling off. The neck connecting tube itself has insufficient resistance to bending and impact, and the annular flange lacks an effective reinforcing structure in the middle, making it prone to warping and deformation under load. Utility Model Content

[0003] This utility model relates to a reinforced structure for a high-strength, impact-resistant weld neck flange, in order to solve the problems mentioned in the background art, such as the simple planar bonding welding of the annular flange and the neck connecting cylinder, the small welding contact area, the limited space for the molten pool, and the weakness of the connection strength due to welding defects; the stress concentration at the bottom of the neck connecting cylinder due to improper structural design, the insufficient bending and impact resistance, and the easy cracking and detachment of the welded part when subjected to impact, vibration or medium pressure.

[0004] This utility model provides a reinforced structure for a high-strength, impact-resistant weld neck flange, specifically including: an annular flange; the inner side of the top end face of the annular flange is provided with welding connection holes in an annular array, the top of the welding connection holes is cylindrical and the bottom is frustoconical, a necked connecting cylinder is welded to the top of the annular flange, and welding connection columns in an annular array on the bottom end face of the necked connecting cylinder are inserted into the welding connection holes and welded.

[0005] Furthermore, the annular flange has an annular reinforcing rib at the middle of its top end face, and an arc-shaped concave welding reinforcing groove is formed on the inner side of the top of the annular reinforcing rib. The annular flange has radial reinforcing ribs on its top end face, which are distributed radially around the axis of the annular flange. One end of the radial reinforcing rib is connected to the annular reinforcing rib, and the other end of the radial reinforcing rib extends to the edge of the annular flange.

[0006] Furthermore, bolt holes are evenly provided on the outer side of the top end face of the annular flange along the circumferential direction, and an annular reinforcing sleeve is provided on the outer periphery of the top of the bolt holes. The annular reinforcing sleeve and the annular flange are integrally formed.

[0007] Furthermore, an annular sealing groove is provided on the sealing surface of the annular flange, and a metal-reinforced sealing gasket is provided in the annular sealing groove. The metal-reinforced sealing gasket includes a metal skeleton and an elastic sealing layer wrapped around the outside of the metal skeleton. The cross-section of the metal skeleton is "I" shaped.

[0008] Furthermore, the bottom of the outer wall of the necked connecting cylinder is provided with an annular reinforcing platform. The reinforcing platform is stepped, and the outer diameter of the reinforcing platform gradually decreases from the end near the annular flange to the end away from the flange. The outermost bottom of the reinforcing platform is provided with a concave welding reinforcing groove. The welding reinforcing groove and the welding reinforcing groove of the annular flange are matched to form a welding groove.

[0009] Furthermore, the bottom of the inner wall of the necked connecting cylinder is provided with a spiral reinforcing rib, which is integrally formed with the necked connecting cylinder, and the height of the necked connecting cylinder is half the radius of the inner wall of the necked connecting cylinder.

[0010] This utility model provides a reinforced structure for a high-strength, impact-resistant weld neck flange, which has the following beneficial effects: 1. The annular flange and the necked connecting cylinder adopt a matching plug-in structure of frustoconical welding connection holes and welding connection columns, and are combined with welding reinforcement grooves and welding reinforcement recesses to form a welding groove, which greatly increases the welding contact area and the space for the molten pool, reduces welding defects, and makes the connection joint of the two more full. It effectively avoids cracking and falling off of the welded parts when subjected to impact or vibration. On the other hand, the combination of annular reinforcing ribs and radial reinforcing ribs enhances the rigidity of the flange center and achieves uniform load distribution. The reinforcing platform can avoid stress concentration when the necked connecting cylinder structure changes abruptly, while the inner wall spiral reinforcing ribs improve the connecting cylinder's resistance to deformation. Under the synergistic effect of multiple factors, the overall bending resistance, warping resistance and impact resistance of the flange are greatly optimized, which can stably cope with the loads and impacts under complex working conditions and ensure structural stability.

[0011] 2. The annular sealing groove provides precise positioning for the metal-reinforced gasket, preventing its displacement. The "I"-shaped metal skeleton provides strong support for the gasket, resisting excessive deformation under high pressure and impact. The outer elastic sealing layer tightly fits the sealing surface to fill tiny gaps, achieving reliable sealing and extending the gasket's lifespan, significantly reducing the risk of media leakage. In terms of connection reliability, the one-piece molded annular reinforcing sleeve around the bolt hole strengthens the structure around the bolt hole, preventing deformation and cracking caused by excessive local stress during bolt tightening, and preventing bolt and hole wall failure under external impact. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0013] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the scope of the present invention.

[0014] In the attached diagram: Figure 1 This is a schematic diagram of the axial view structure of this utility model; Figure 2 This is a schematic diagram of the disassembled structure of this utility model; Figure 3 This is a schematic diagram of the overall cross-sectional structure of this utility model; Figure 4 This utility model Figure 3 A magnified structural diagram at point A; Figure 5 This is a schematic diagram of the cross-sectional structure of the annular flange of this utility model; Figure 6 This is a cross-sectional view of the necked connecting cylinder of this utility model.

[0015] In the diagram, the correspondence between component names and drawing numbers is as follows: 1. Annular flange; 101. Welded connection hole; 102. Annular reinforcing rib; 103. Welded reinforcing groove; 104. Radial reinforcing rib; 105. Bolt hole; 106. Annular reinforcing sleeve; 107. Annular sealing groove; 2. Necked connecting sleeve; 201. Reinforcing platform; 202. Welded reinforcing groove; 203. Welded connecting column; 204. Spiral reinforcing rib. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0017] Example 1: As shown in the attached document Figure 1 To be continued Figure 6 As shown: This utility model provides a reinforced structure for a high-strength, impact-resistant weld neck flange, comprising: an annular flange 1, with welding connection holes 101 arranged in a ring array on the inner side of the top end face of the annular flange 1. The top of the welding connection holes 101 is cylindrical and the bottom is frustoconical. A necked connecting cylinder 2 is welded to the top of the annular flange 1. Welding connection columns 203 arranged in a ring array on the bottom end face of the necked connecting cylinder 2 are inserted into the welding connection holes 101 and welded. Specifically, the frustoconical welding connection holes 101 in the annular flange 1 and the welding connection columns 203 of the necked connecting cylinder 2 form a matching insertion structure, increasing the contact area during welding. The frustoconical design also guides the weld pool to fill evenly, reducing welding defects and significantly improving the connection strength between the annular flange 1 and the necked connecting cylinder 2. This avoids cracking and detachment due to insufficient strength at the welded part under impact or vibration loads, laying the foundation for the overall structural stability of the flange.

[0018] The annular flange 1 has an annular reinforcing rib 102 at the middle of its top end face. An arc-shaped, concave welded reinforcing groove 103 is formed on the inner side of the top of the annular reinforcing rib 102. Radial reinforcing ribs 104 are also provided on the top end face of the annular flange 1. These ribs are distributed radially around the axis of the annular flange 1. One end of each rib is connected to the annular reinforcing rib 102, and the other end extends to the edge of the annular flange 1. Specifically, the annular reinforcing rib 102 enhances the structural rigidity of the central region of the annular flange 1, reducing deformation caused by stress in the center of the flange. The radial reinforcing ribs 104, through their connection with the annular reinforcing rib 102 and the edge of the flange, evenly distribute the impact load and bolt tightening force along the radial direction to the entire flange, avoiding localized stress concentration. Furthermore, the combination of these two elements further enhances the flange's resistance to warping, preventing deformation of the flange under complex working conditions from affecting the sealing and connection performance.

[0019] The annular flange 1 has bolt holes 105 evenly distributed around its outer top face along the circumferential direction. An annular reinforcing sleeve 106 is provided around the top of each bolt hole 105. The annular reinforcing sleeve 106 and the annular flange 1 are integrally formed. Specifically, the annular reinforcing sleeve 106 strengthens the area surrounding the bolt holes 105, preventing deformation and cracking of the bolt holes 105 due to excessive local stress during bolt tightening. The integral design ensures the stability of the connection between the reinforcing sleeve and the flange, allowing the tightening force transmitted by the bolts to be more evenly distributed onto the flange. It also enhances the impact resistance of the bolt holes 105, preventing bolt failure under external impact and ensuring the reliability of the flange connection.

[0020] The annular flange 1 has an annular sealing groove 107 on its sealing surface. A metal-reinforced gasket is installed inside the annular sealing groove 107. The metal-reinforced gasket includes a metal skeleton and an elastic sealing layer wrapped around the outside of the metal skeleton. The cross-section of the metal skeleton is "I". Specifically, the annular sealing groove 107 provides a stable installation and positioning space for the metal-reinforced gasket, preventing the gasket from shifting during operation. The "I"-shaped metal skeleton provides strong structural support for the gasket, improving its pressure resistance and impact resistance, and preventing excessive deformation or damage to the gasket under high pressure and impact loads. The outer elastic sealing layer can tightly fit the sealing surface, effectively filling tiny gaps in the sealing surface and achieving a reliable seal. The combination of the two ensures the stability of the sealing effect, extends the service life of the gasket, and reduces the risk of media leakage.

[0021] The necked connecting cylinder 2 has an annular reinforcing platform 201 at the bottom of its outer wall. The reinforcing platform 201 is stepped, and its outer diameter gradually decreases from the end near the annular flange 1 to the end away from the flange. The outermost bottom of the reinforcing platform 201 has a recessed welding reinforcing groove 202. The welding reinforcing groove 202 and the welding reinforcing groove 103 of the annular flange 1 match to form a welding groove. Specifically, the stepped reinforcing platform 201 with a gradually changing outer diameter can enhance the structural strength of the bottom of the necked connecting cylinder 2, while avoiding stress concentration caused by structural abrupt changes, thus improving the bending and impact resistance of the necked connecting cylinder 2. The welding groove formed by the welding reinforcing groove 202 and the welding reinforcing groove 103 increases the space for the molten pool when welding the necked connecting cylinder 2 and the annular flange 1, making the weld joint fuller, further improving the strength and sealing of the connection between the two, and preventing the weld from failing under harsh working conditions.

[0022] The inner wall of the necked connecting cylinder 2 is provided with a spiral reinforcing rib 204 at the bottom. The spiral reinforcing rib 204 and the necked connecting cylinder 2 are integrally formed. The height of the necked connecting cylinder 2 is half the radius of the inner wall of the necked connecting cylinder 2. Specifically, the integrally formed spiral reinforcing rib 204 can significantly enhance the structural rigidity of the inner wall of the necked connecting cylinder 2, improve its resistance to deformation, and effectively resist the squeezing and bending caused by the pressure of the medium in the pipeline and external impact on the necked connecting cylinder 2. At the same time, the spiral structure can guide the medium flowing in the pipeline, reduce the impact and scouring of the medium on the inner wall of the necked connecting cylinder 2, reduce the wear of the inner wall, extend the service life of the necked connecting cylinder 2, and ensure the overall flow performance and structural stability of the flange.

[0023] The specific usage and function of this embodiment are as follows: When using the reinforced structure of this high-strength, impact-resistant weld neck flange, first insert the welded connecting post 203 at the bottom of the neck connecting cylinder 2 into the welded connecting hole 101 of the annular flange 1. The frustoconical design at the bottom of the welded connecting hole 101 guides the weld pool to fill evenly. A strong weld is achieved by utilizing the welded reinforcing groove 202 of the reinforcing platform 201 of the neck connecting cylinder 2 and the welded reinforcing groove 103 of the annular reinforcing rib 102 of the annular flange 1, forming a weld groove between the two. Then, butt weld the end of the neck connecting cylinder 2 away from the flange to the pipe to be connected, completing the connection between the pipe and the flange. When connecting the flanges, the metal reinforced gasket is embedded in the annular sealing groove 107 of the annular flange 1 when docking with another flange. The two flanges are fastened by bolts passing through the bolt holes 105 and the annular reinforcing sleeve 106. At this time, the radial reinforcing ribs 104 and the annular reinforcing ribs 102 work together to disperse the bolt fastening force and external impact load. The reinforcing platform 201 and the spiral reinforcing ribs 204 enhance the impact resistance and deformation resistance of the necked connecting cylinder 2 from the outside and the inside, respectively. The overall structure effectively resists the influence of complex working conditions such as impact and vibration while ensuring connection strength and sealing performance.

[0024] Example 2: A positioning protrusion is provided on the inner side of the annular sealing groove 107 of the annular flange 1, and a corresponding positioning groove is provided on the inner side of the metal skeleton of the metal reinforced gasket. Three positioning pin holes are added to the outer side of the annular reinforcing rib 102 at the top of the annular flange 1, and three positioning pins are correspondingly provided at the bottom of the necked connecting tube 2. The ends of the radial reinforcing ribs 104 extend to the edge of the flange and then bend outward to form an installation guide slope. The positioning protrusion and the positioning groove cooperate to improve the installation positioning accuracy of the metal reinforced gasket and avoid leakage caused by gasket misalignment. The positioning pins and positioning pin holes cooperate to simplify the welding alignment process between the necked connecting tube 2 and the flange, improve installation efficiency, and facilitate the alignment of the bolt holes 105 when the two flanges are connected, reducing flange deformation caused by forced alignment.

Claims

1. A reinforced structure for a high-strength, impact-resistant weld neck flange, characterized in that, The annular flange (1) is provided with welding connection holes (101) arranged in an annular array on the inner side of the top end face of the annular flange (1). The top of the welding connection hole (101) is cylindrical and the bottom is frustoconical. A necked connecting cylinder (2) is welded to the top of the annular flange (1). Welding connection columns (203) arranged in an annular array on the bottom end face of the necked connecting cylinder (2) are inserted into the welding connection hole (101) and welded.

2. The reinforced structure of the high-strength impact-resistant weld neck flange according to claim 1, characterized in that, The annular flange (1) has an annular reinforcing rib (102) at the middle of the top end face. The annular reinforcing rib (102) has an arc-shaped concave welded reinforcing groove (103) on the inner side of the top. The annular flange (1) has radial reinforcing ribs (104) on the top end face. The radial reinforcing ribs (104) are distributed radially around the axis of the annular flange (1). One end of the radial reinforcing ribs (104) is connected to the annular reinforcing rib (102), and the other end of the radial reinforcing ribs (104) extends to the edge of the annular flange (1).

3. The reinforced structure of the high-strength impact-resistant weld neck flange according to claim 1, characterized in that, The annular flange (1) has bolt holes (105) evenly distributed along the circumferential direction on the outer side of the top end face. An annular reinforcing sleeve (106) is provided on the outer periphery of the top of the bolt holes (105). The annular reinforcing sleeve (106) and the annular flange (1) are integrally formed.

4. The reinforced structure of the high-strength impact-resistant weld neck flange according to claim 1, characterized in that, The annular flange (1) has an annular sealing groove (107) on its sealing surface. A metal reinforced sealing gasket is provided in the annular sealing groove (107). The metal reinforced sealing gasket includes a metal skeleton and an elastic sealing layer wrapped around the outside of the metal skeleton. The cross-section of the metal skeleton is "I".

5. The reinforced structure of the high-strength impact-resistant weld neck flange according to claim 1, characterized in that, The bottom of the outer wall of the necked connecting cylinder (2) is provided with an annular reinforcing platform (201). The reinforcing platform (201) is stepped. The outer diameter of the reinforcing platform (201) gradually decreases from the end near the annular flange (1) to the end away from the flange. The outermost end of the reinforcing platform (201) is provided with a concave welding reinforcing groove (202). The welding reinforcing groove (202) and the welding reinforcing groove (103) of the annular flange (1) match to form a welding groove.

6. The reinforced structure of the high-strength impact-resistant weld neck flange according to claim 1, characterized in that, The bottom of the inner wall of the necked connecting cylinder (2) is provided with a spiral reinforcing rib (204). The spiral reinforcing rib (204) and the necked connecting cylinder (2) are integrally formed. The height of the necked connecting cylinder (2) is half the radius of the inner wall of the necked connecting cylinder (2).

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