Flexible pipe water hammer resistant end fitting
Patent Information
- Application Number
- CN202620162597.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-04
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2036-02-04
AI Technical Summary
[0004]本实用新型主要是针对现有技术中柔性管道端部接头抗水锤效果差、密封可靠性不足、拆装不便的问题，提供一种柔性管道抗水锤端部接头
（1）本实用新型在第二本体段内侧壁沿液体流动方向依次设置第一缓冲组件和第二缓冲组件，形成双重缓冲结构；第一缓冲组件采用带镂空孔的螺旋叶片，可引导水流形成旋流并分散水流冲击力，实现一级缓冲；第二缓冲组件采用交错布置的带通孔弧形缓冲板，可延长水流路径、进一步分流缓冲，实现二级缓冲；同时螺旋叶片与弧形缓冲板之间设置旋流分散空间，避免冲击力集中，双重缓冲配合旋流分散，可有效削弱水锤产生的瞬时冲击压力，保护接头和管道，延长管道系统使用寿命；
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Figure CN224872146U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of pipe fitting technology, and in particular to a flexible pipe end fitting resistant to water hammer. Background Technology
[0002] In flexible pipeline transportation systems, water hammer is a common destructive problem, mainly caused by sudden changes in the water flow velocity in the pipeline (such as rapid opening and closing of valves or starting and stopping of pumps). The instantaneous impact pressure will propagate along the pipeline, which can easily lead to failure of sealing at pipeline joints, loosening of joints, or even pipeline damage. This seriously affects the normal operation of the pipeline system, shortens the service life of the pipeline, and increases maintenance costs and safety hazards.
[0003] Currently, most existing flexible pipe end joints only have basic connection and sealing functions, lacking targeted anti-water hammer structural designs and failing to effectively buffer water hammer impact. Some joints with buffer structures have unreasonable buffer component designs, resulting in limited buffering effects, and most are single buffering methods, making it difficult to adapt to water hammer impacts under different working conditions. At the same time, the sealing structures of existing joints are mostly single seals, with insufficient sealing reliability. Under repeated water hammer impacts, problems such as seal wear and leakage are prone to occur. In addition, some joints have complex connection methods, making disassembly and assembly inconvenient and hindering later maintenance and component replacement. Utility Model Content
[0004] This utility model mainly addresses the problems of poor water hammer resistance, insufficient sealing reliability, and inconvenient disassembly and assembly of flexible pipe end joints in the prior art, and provides a flexible pipe water hammer resistance end joint.
[0005] The objective of this utility model is mainly achieved through the following solution: A flexible pipe water hammer resistant end joint includes a first connecting pipe and a second connecting pipe; The first connecting pipe includes a first connecting flange, a first body section, a transition section, an enlarged section, and a second connecting flange arranged sequentially. The second connecting pipe includes a second body section, a third connecting flange, and a fourth connecting flange arranged sequentially; The second body section of the second connecting pipe is inserted into the first connecting pipe, and the front end of the second body section is provided with a first sealing ring. The first sealing ring abuts against the inner wall of the transition section. The third connecting flange is detachably fixedly connected to the second connecting flange, and a second sealing ring and a third sealing ring are provided between the second body section and the expansion section. The inner wall of the second body section is provided with a first buffer component and a second buffer component in sequence along the direction of liquid flow.
[0006] Preferably, the diameter of the transition section gradually increases along the flow direction of the liquid, and the outer wall of the first sealing ring is adapted to the inner wall of the transition section, and the first sealing ring abuts against the end of the transition section near the first body section, and the inner diameter of the first sealing ring is consistent with the inner diameter of the first body section and the second body section.
[0007] Preferably, the third connecting flange is coaxially fixedly connected to the outer side wall of the second body section, and the front end of the third connecting flange is integrally provided with a protrusion. The protrusion is inserted into the rear end of the expansion section, and the outer diameter of the protrusion is adapted to the inner diameter of the expansion section. Both the second and third connecting flanges have multiple screw holes evenly distributed along their circumference on their end faces. The second and third connecting flanges are fixed by locking bolts passing through the screw holes.
[0008] Preferably, the rear end of the expanded section is provided with a raised ring, the second sealing ring and the third sealing ring are both annular sealing structures, the second sealing ring and the third sealing ring are both sleeved on the outer side wall of the second body section, and the second sealing ring is located between the third sealing ring and the raised part. The front end of the third sealing ring is provided with a notch that matches the boss; When the second and third connecting flanges are fixed together by locking bolts, the third sealing ring can abut against the side wall of the boss through the notch.
[0009] Preferably, the first buffer assembly adopts a helical blade, which is fixedly connected to the inner wall of the second body section, and a main channel is provided through the middle of the helical blade. The spiral blade has multiple hollow holes evenly distributed on its blade body.
[0010] Preferably, the second buffer assembly includes a plurality of arc-shaped buffer plates with consistent axial spacing. The plurality of arc-shaped buffer plates are disposed on the inner wall of the second body section and are arranged alternately up and down along the flow direction of the liquid, and the maximum radial height of the arc-shaped buffer plates is ≤ 1 / 4 of the inner diameter of the second body section. The sidewall of the arc-shaped buffer plate is uniformly provided with multiple through holes.
[0011] Preferably, the spiral blades have a rounded chamfer at the flow-facing end, and the edges of the hollow holes are all rounded.
[0012] Preferably, the axial distance between the helical blades and the arc-shaped buffer plate is 1.0 to 1.2 times the inner diameter of the second body section, forming a swirling dispersion space.
[0013] In summary, compared with the prior art, the present invention has the following beneficial technical effects: (1) The present invention provides a first buffer component and a second buffer component in sequence along the liquid flow direction on the inner side wall of the second body section to form a double buffer structure; the first buffer component adopts a spiral blade with hollow holes, which can guide the water flow to form a vortex and disperse the water flow impact force to achieve a first-level buffer; the second buffer component adopts an arc-shaped buffer plate with through holes arranged in an alternating manner, which can extend the water flow path and further divert the buffer to achieve a second-level buffer; at the same time, a vortex dispersion space is set between the spiral blade and the arc-shaped buffer plate to avoid the concentration of impact force. The double buffer combined with the vortex dispersion can effectively weaken the instantaneous impact pressure generated by water hammer, protect the joints and pipes, and extend the service life of the pipeline system; (2) This utility model is provided with a triple sealing structure. The first sealing ring is adapted to abut against the inner side wall of the transition section to achieve front-end sealing. The second and third sealing rings are sleeved on the outer side of the second body section, and the third sealing ring is positioned by the notch and the boss of the first body section to avoid displacement of the sealing element and achieve double sealing at the rear end. The triple seals work together to effectively prevent liquid leakage, adapt to the usage requirements under different pressure conditions, and improve the sealing stability of the joint. (3) The protrusion of the third connecting flange of this utility model is inserted into the enlarged section, which can position the second body section and improve the coaxiality and stability of the connection; the second connecting flange and the third connecting flange are detachably fixedly connected by locking bolts, which is simple in structure and reliable in connection. At the same time, it is convenient for the disassembly, maintenance and replacement of parts of the joint, reducing the later maintenance cost. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is the front view of this utility model; Figure 3 This is a cross-sectional view of the present invention.
[0015] Reference numerals: 1-First connecting pipe, 2-Second connecting pipe, 3-First connecting flange, 4-First body section, 5-Transition section, 6-Expanded diameter section, 7-Second connecting flange, 8-Second body section, 9-Third connecting flange, 10-Fourth connecting flange, 11-First sealing ring, 12-Second sealing ring, 13-Third sealing ring, 14-Protrusion, 15-Screw hole, 16-Locking bolt, 17-Boss, 18-Notch, 19-Helical blade, 20-Arc-shaped buffer plate. Detailed Implementation
[0016] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.
[0017] like Figure 1-3 As shown, this embodiment provides a flexible pipe anti-water hammer end joint, including a first connecting pipe 1 and a second connecting pipe 2. All components are made of stainless steel and have good corrosion resistance and impact resistance, making them suitable for use in water supply and drainage pipe systems.
[0018] The first connecting pipe 1 includes a first connecting flange 3, a first body section 4, a transition section 5, an enlarged diameter section 6, and a second connecting flange 7, which are integrally formed sequentially. The first connecting flange 3 is used to connect with an external flexible pipe, and its end face is evenly provided with 4 connecting holes along the circumferential direction to adapt to the installation of the external pipe flange. The diameter of the transition section 5 gradually increases along the direction of liquid flow. Its inner diameter near the end of the first body section 4 is the same as the inner diameter of the first body section 4, and its inner diameter near the end of the enlarged diameter section 6 is the same as the inner diameter of the enlarged diameter section 6. The diameter of the second connecting flange 7 is the same as the outer diameter of the enlarged diameter section 6, and its end face is evenly provided with 4 screw holes 15 along the circumferential direction. The screw holes are used to connect with the third connecting flange 9.
[0019] The second connecting pipe 2 includes a second body section 8, a third connecting flange 9, and a fourth connecting flange 10, which are integrally formed in sequence. The fourth connecting flange 10 is used to connect with another external flexible pipe, and its structure is the same as that of the first connecting flange 3. A first sealing ring 11 is sleeved on the front end of the second body section 8. The first sealing ring 11 is made of nitrile rubber, and its outer side wall is adapted to the inner side wall of the transition section 5. Its inner diameter is the same as that of the first body section 4 and the second body section 8. The first sealing ring 11 abuts against the end of the transition section 5 near the first body section 4 to achieve front-end sealing.
[0020] The third connecting flange 9 is coaxially fixedly connected to the outer wall of the second body section 8 and located at the rear end of the second body section 8. Its front end is integrally provided with a ring of protrusions 14, which are adapted to the inner diameter of the first body section 4. The protrusions 14 are inserted into the rear end of the expanded diameter section 6 to realize the positioning of the second body section 8. The end face of the third connecting flange 9 is evenly provided with 4 screw holes 15 along the circumferential direction, which correspond one-to-one with the screw holes 15 of the second connecting flange 7. The second connecting flange 7 and the third connecting flange 9 are fixed by locking bolts 16 (M12 bolts) passing through the screw holes 15, which makes disassembly and assembly convenient.
[0021] The rear end of the expanded section 6 has a raised boss 17, the inner diameter of which is smaller than the inner diameter of the first body section 4. The second sealing ring 12 and the third sealing ring 13 are both annular sealing structures made of fluororubber and suitable for use with water media. The second sealing ring 12 and the third sealing ring 13 are both fitted on the outer wall of the second body section 8, and the second sealing ring 12 is located between the third sealing ring 13 and the raised part 14, and the two are in close contact. The front end of the third sealing ring 13 has a recess 18 that matches the raised boss 17. When the locking bolt 16 is tightened, the third sealing ring 13 abuts against the side wall of the raised boss 17 through the recess 18 to achieve positioning and prevent displacement. The double seal improves the sealing reliability.
[0022] The inner wall of the second body section 8 is provided with a first buffer assembly (spiral blade 19) and a second buffer assembly (arc-shaped buffer plate 20) in sequence along the direction of liquid flow. The spiral blade 19 is made of stainless steel and is fixedly connected to the inner wall of the second body section 8. The spiral angle of the spiral blade 19 is 30°, and a main channel is provided through the middle. The effective inner diameter of the main channel is not less than 3 / 4 of the inner diameter of the second body section 8. Multiple hollow holes (not shown in the figure) are evenly opened on the blade body of the spiral blade 19. The flow-facing end of the spiral blade 19 is provided with a rounded chamfer. The edges of the hollow holes are all rounded to reduce water flow resistance and stress concentration.
[0023] The second buffer assembly includes three axially spaced arc-shaped buffer plates 20. The arc-shaped buffer plates 20 are made of stainless steel and are in the shape of a quarter arc. They are fixedly connected to the inner wall of the second body section 8. The three arc-shaped buffer plates 20 are arranged alternately up and down along the direction of liquid flow (adjacent buffer plates are fixed to the upper and lower sides of the inner wall, respectively). The maximum radial height of the arc-shaped buffer plate 20 is equal to 1 / 4 of the inner diameter of the second body section 8. Four through holes (not shown in the figure) are evenly opened on its side wall to further divert and buffer the flow.
[0024] The spiral blade 19 and the arc-shaped buffer plate 20 form a swirling dispersion space, which allows the swirling water flow after being buffered by the spiral blade 19 to be fully dispersed before entering the second buffer component for secondary buffering, thereby improving the overall water hammer resistance effect.
[0025] The working principle of this embodiment is as follows: In use, the connector is connected and fixed to two external flexible pipes through the first connecting flange 3 and the fourth connecting flange 10; the liquid flows along the first body section 4, the transition section 5, and the second body section 8 of the second connecting pipe 2 of the first connecting pipe 1. When water hammer occurs in the pipe, the instantaneous impact water flow first contacts the spiral blade 19. The spiral blade 19 guides the water flow to form a vortex, and the hollow hole diverts part of the water flow to achieve a first-level buffer; the water flow after the first-level buffer enters the vortex dispersion space, and after being fully dispersed, it flows to the arc-shaped buffer plate 20. The staggered arc-shaped buffer plate 20 extends the water flow path, and the through hole further diverts the flow, weakening the remaining impact pressure to achieve a second-level buffer; the triple sealing structure (first sealing ring 11, second sealing ring 12, and third sealing ring 13) effectively prevents liquid leakage, and the protrusion 14 and locking bolt 16 ensure stable connection. The overall structure achieves the effects of water hammer resistance, reliable sealing, and convenient disassembly and assembly.
[0026] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A flexible pipe water hammer resistant end joint, characterized in that: Includes a first connecting pipe (1) and a second connecting pipe (2); The first connecting pipe (1) includes a first connecting flange (3), a first body section (4), a transition section (5), an enlarged diameter section (6), and a second connecting flange (7) arranged in sequence. The second connecting pipe (2) includes a second body section (8), a third connecting flange (9) and a fourth connecting flange (10) arranged in sequence; The second body section (8) of the second connecting pipe (2) is inserted into the first connecting pipe (1), and the front end of the second body section (8) is provided with a first sealing ring (11). The first sealing ring (11) abuts against the inner wall of the transition section (5). The third connecting flange (9) is detachably fixedly connected to the second connecting flange (7), and a second sealing ring (12) and a third sealing ring (13) are provided between the second body section (8) and the expansion section (6). The inner wall of the second body section (8) is provided with a first buffer component and a second buffer component in sequence along the flow direction of the liquid.
2. The flexible pipe water hammer resistant end joint according to claim 1, characterized in that: The diameter of the transition section (5) gradually increases along the direction of liquid flow, and the outer wall of the first sealing ring (11) is adapted to the inner wall of the transition section (5), and the first sealing ring (11) abuts against the end of the transition section (5) near the first body section (4), and the inner diameter of the first sealing ring (11) is consistent with the inner diameter of the first body section (4) and the second body section (8).
3. The flexible pipe water hammer resistant end joint according to claim 1, characterized in that: The third connecting flange (9) is coaxially fixedly connected to the outer wall of the second body section (8), and the front end of the third connecting flange (9) is integrally provided with a ring of protrusions (14). The protrusions (14) are inserted into the rear end of the expansion section (6), and the outer diameter of the protrusions (14) is adapted to the inner diameter of the expansion section (6). The second connecting flange (7) and the third connecting flange (9) are provided with a plurality of screw holes (15) evenly along their circumference on their end faces. The second connecting flange (7) and the third connecting flange (9) are fixed by locking bolts (16) passing through the screw holes (15).
4. The flexible pipe water hammer resistant end joint according to claim 3, characterized in that: The rear end of the expanded section (6) is provided with a ring of boss (17). The second sealing ring (12) and the third sealing ring (13) are both annular sealing structures. The second sealing ring (12) and the third sealing ring (13) are both sleeved on the outer side wall of the second body section (8), and the second sealing ring (12) is located between the third sealing ring (13) and the protrusion (14). The front end of the third sealing ring (13) is provided with a notch (18) that matches the boss (17). When the second connecting flange (7) and the third connecting flange (9) are fixed together by locking bolts (16), the third sealing ring (13) can abut against the side wall of the boss (17) through the notch (18).
5. A flexible pipe water hammer resistant end joint according to claim 1, characterized in that: The first buffer assembly uses a spiral blade (19), which is fixedly connected to the inner wall of the second body section (8), and the main channel is provided through the middle of the spiral blade (19). The spiral blade (19) has multiple hollow holes evenly distributed on its blade body.
6. A flexible pipe water hammer resistant end joint according to claim 5, characterized in that: The second buffer assembly includes a plurality of arc-shaped buffer plates (20) with consistent axial spacing. The plurality of arc-shaped buffer plates (20) are disposed on the inner wall of the second body section (8) and are arranged alternately up and down along the flow direction of the liquid. The maximum radial height of the arc-shaped buffer plate (20) is ≤ 1 / 4 of the inner diameter of the second body section (8). The sidewall of the arc-shaped buffer plate (20) is uniformly provided with multiple through holes.
7. A flexible pipe water hammer resistant end joint according to claim 6, characterized in that: The spiral blade (19) has a rounded chamfer at the flow-facing end, and the edges of the hollow holes are all rounded.
8. A flexible pipe water hammer resistant end joint according to claim 7, characterized in that: The axial distance between the spiral blade (19) and the arc-shaped buffer plate (20) is 1.0 to 1.2 times the inner diameter of the second body section (8), forming a swirling dispersion space.