A connection structure for high-pressure pipeline

Abstract

The present invention discloses a connection structure for a high-pressure pipeline, which belongs to the field of pipeline connection. The connection structure includes a driven component and an active component. The driven component includes a first flange, a positioning flange and a first sealing ring. The end face of the positioning flange facing away from the first flange has a T-shaped groove, and the end of the first sealing ring facing away from the first flange has a first inclined surface. The active component includes a second flange, a second sealing ring and a first bolt. One end of the second flange can be movably inserted into one end of the second sealing ring. The other end of the second sealing ring has a second inclined surface. The second inclined surface has the same inclination angle as the first inclined surface, and the second sealing ring can be movably inserted into the second groove body. Sealing rings are sequentially sandwiched between the first flange, the positioning flange, the first sealing ring, the second sealing ring and the second flange. A connection structure for a high-pressure pipeline provided by an embodiment of the present invention can achieve uniform compression of the sealing ring when the fitting surfaces of the two flanges are not parallel.

Description

Technical Field

[0001] The present invention belongs to the field of pipeline connection, and more particularly, relates to a connection structure for high-pressure pipelines. Background Art

[0002] A flange, also known as a flange or flange, is a component that connects pipes to each other. It has through holes for bolts and is typically a disk-shaped metal body with several holes cut around the perimeter for connection. For high-pressure material transportation, the existing flange connection involves securing two high-pressure pipes, fittings, or equipment to a flange. A sealing ring is then placed between the two flanges and bolted together to complete the connection.

[0003] However, under normal circumstances, the welding process of the high-pressure pipeline and the flange or the deformation of the pipeline caused by stress release due to frequent reversal of high-pressure oil in the operation of hydraulic machine tools will cause the fitting surfaces of the two flanges to be non-parallel, thereby causing the clamped sealing ring to be locally compressed (the sealing ring is not evenly compressed), resulting in leakage of high-pressure materials. Summary of the Invention

[0004] In response to the above-mentioned defects or improvement needs of the prior art, the present invention provides a connection structure for high-pressure pipelines, the purpose of which is not only to achieve the connection between the first high-pressure pipeline and the second high-pressure pipeline, but also to achieve uniform compression of the sealing ring when the fitting surfaces of the two flanges are not parallel, thereby ensuring the sealing performance between the first high-pressure pipeline and the second high-pressure pipeline.

[0005] The present invention provides a connection structure for a high-pressure pipeline, the connection structure comprising a driven component and a driving component;

[0006] The driven assembly includes a first flange, a positioning flange, and a first sealing ring. The first flange is coaxially fixedly connected to the positioning flange. The end surface of the positioning flange facing away from the first flange has a T-shaped groove. The T-shaped groove includes a first groove body and a second groove body. The outer diameter of the first groove body is smaller than that of the second groove body. The first sealing ring is inserted into the first groove body. The end of the first sealing ring facing away from the first flange has a first inclined surface.

[0007] The active component includes a second flange, a second sealing ring, and a plurality of first bolts. One end of the second flange is movably coaxially inserted into one end of the second sealing ring. The other end of the second sealing ring has a second inclined surface. The second inclined surface has the same inclination angle as the first inclined surface. The other end of the second sealing ring is movably inserted into the second groove body. The plurality of first bolts are movably inserted into the second flange, and the plurality of first bolts are arranged at intervals to connect the positioning flange.

[0008] Sealing rings are sequentially sandwiched between the first flange, the positioning flange, the first sealing ring, the second sealing ring and the second flange.

[0009] Optionally, the end surface of the first flange facing the positioning flange has a first flange, the end surface of the positioning flange facing the first flange has a first positioning groove, and the first flange is coaxially inserted in the first positioning groove.

[0010] Optionally, a plurality of second bolts are inserted into the first flange, and the plurality of second bolts are arranged at intervals along the circumference of the first flange to connect the positioning flange.

[0011] Optionally, the second flange has a plurality of through holes, which are arranged at intervals along the circumference of the second flange, and each of the first bolts is inserted into the corresponding through hole, and the first bolt is loosely fitted with the through hole.

[0012] Optionally, the top movable sleeve of each first bolt is provided with a convex ball pad and a concave ball pad that cooperate with each other, and the parallel end face of each convex ball pad fits with the bottom surface of the nut of the first bolt, and the parallel end face of the concave ball pad fits with the other end face of the second flange.

[0013] Optionally, the through holes are waist-shaped holes, and each waist-shaped hole extends along the radial direction of the second flange.

[0014] Optionally, one end surface of the second flange has a second flange, one end surface of the second sealing ring has a second positioning groove, and the second flange can be movably inserted into the second positioning groove.

[0015] Optionally, the outer peripheral wall of the second sealing ring has a plurality of drive grooves arranged at intervals, and each of the drive grooves is arranged along the radial direction of the second sealing ring.

[0016] Optionally, each of the sealing rings includes a first sealing ring and a second sealing ring, and the inner diameter of the first sealing ring is greater than the outer diameter of the second sealing ring.

[0017] Optionally, both ends of the inner holes of the first flange, the positioning flange, the first sealing ring, the second sealing ring and the second flange have rounded corners.

[0018] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0019] For a connection structure for a high-pressure pipeline provided in an embodiment of the present invention, when connecting a first high-pressure pipeline and a second high-pressure pipeline, first, the first high-pressure pipeline is welded to the first flange and the second high-pressure pipeline is welded to the second flange respectively. At this time, the top surface of the first flange is not parallel to the bottom surface of the second flange (there is an inclined angle). Then, a positioning flange and a first sealing ring are arranged on the first flange, and a second sealing ring is arranged on the second flange, and the positioning flange and the second flange are roughly connected by a first bolt (the first bolt is not tightened and the second sealing ring can rotate). At this time, there is an inclined angle between the first inclined surface of the first sealing ring and the second inclined surface of the second sealing ring. Then, the second sealing ring is rotated by a certain adjustment angle around the axis of the second sealing ring until the second inclined surface of the second sealing ring is parallel to the first inclined surface of the first sealing ring, that is, the adjustment angle can compensate for the inclined angle. Finally, each first bolt is tightened. During the tightening process, the second flange swings accordingly and fits parallel to the second sealing ring, thereby achieving the connection between the first high-pressure pipeline and the second high-pressure pipeline. At this time, the end faces of any two adjacent components of the first flange, the positioning flange, the first sealing ring, the second sealing ring and the second flange are parallel and close to each other, and with the cooperation of the sealing ring, the sealing ring can be evenly compressed to avoid the problem of local compression of the sealing ring causing leakage of high-pressure material, thereby ensuring the sealing performance between the first high-pressure pipeline and the second high-pressure pipeline.

[0020] That is to say, the connection structure for high-pressure pipelines provided by the embodiment of the present invention can not only realize the connection between the first high-pressure pipeline and the second high-pressure pipeline, but also realize uniform compression of the sealing ring when the fitting surfaces of the two flanges are not parallel, thereby ensuring the sealing performance between the first high-pressure pipeline and the second high-pressure pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a cross-sectional view of a first state of a connection structure for a high-pressure pipeline provided by an embodiment of the present invention;

[0022] Figure 2 is a cross-sectional view of a second state of a connection structure for a high-pressure pipeline provided by an embodiment of the present invention;

[0023] Figure 3 is a structural schematic diagram of a second flange provided in an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the assembly of the convex ball pad and the concave ball pad provided in an embodiment of the present invention.

[0025] The symbols in the figure mean the following:

[0026] 1. Driven component; 11. First flange; 111. First flange; 112. Second bolt; 12. Positioning flange; 121. First slot; 122. Second slot; 13. First sealing ring; 131. First inclined surface; 2. Active component; 21. Second flange; 211. Through hole; 212. Second flange; 22. Second sealing ring; 221. Second inclined surface; 222. Drive groove; 23. First bolt; 231. Male ball pad; 232. Female ball pad; 3. Sealing ring; 31. First sealing ring; 32. Second sealing ring; 100. First high-pressure pipeline; 200. Second high-pressure pipeline. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0032] Figure 1 : is a cross-sectional view of a first state of a connection structure for a high-pressure pipeline provided by an embodiment of the present invention, such as Figure 1 As shown, the connection structure includes a driven component 1 and a driving component 2 .

[0033] The driven assembly 1 includes a first flange 11, a positioning flange 12 and a first sealing ring 13. The first flange 11 is coaxially fixedly connected to the positioning flange 12. The end surface of the positioning flange 12 facing away from the first flange 11 has a T-shaped slot. The T-shaped slot includes a first slot body 121 and a second slot body 122. The outer diameter of the first slot body 121 is smaller than that of the second slot body 122. The first sealing ring 13 is inserted into the first slot body 121. The end of the first sealing ring 13 facing away from the first flange 11 has a first inclined surface 131.

[0034] The active component 2 includes a second flange 21, a second sealing ring 22 and a plurality of first bolts 23. One end of the second flange 21 can be movably coaxially inserted into one end of the second sealing ring 22. The other end of the second sealing ring 22 has a second inclined surface 221. The second inclined surface 221 has the same inclination angle as the first inclined surface 131, and the other end of the second sealing ring 22 can be movably inserted into the second groove body 122. The plurality of first bolts 23 can be movably inserted into the second flange 21, and the plurality of first bolts 23 are arranged at intervals to connect the positioning flange 12.

[0035] A sealing ring 3 is sequentially sandwiched between the first flange 11 , the positioning flange 12 , the first sealing ring 13 , the second sealing ring 22 and the second flange 21 .

[0036] Regarding a connection structure for a high-pressure pipeline provided by an embodiment of the present invention, when connecting the first high-pressure pipeline 100 and the second high-pressure pipeline 200, first, the first high-pressure pipeline 100 is welded to the first flange 11, and the second high-pressure pipeline 200 is welded to the second flange 21. At this time, the top surface of the first flange 11 is not parallel to the bottom surface of the second flange 21 (there is an inclined angle). Then, the positioning flange 12 and the first sealing ring 13 are arranged on the first flange 11, and the second sealing ring 22 is arranged on the second flange 21, and the positioning flange 12 and the second flange 21 are roughly connected by the first bolt 23 (the first bolt 23 is not tightened, and the second sealing ring 22 can rotate). At this time, there is an inclined angle between the first inclined surface 131 of the first sealing ring 13 and the second inclined surface 221 of the second sealing ring 22 (see Figure 1 ). Then, the second sealing ring 22 is rotated by a certain adjustment angle with its axis as the axis, until the second inclined surface 221 of the second sealing ring 22 is parallel to the first inclined surface 131 of the first sealing ring 13, that is, the adjustment angle can compensate for the tilt angle. Finally, each first bolt 23 is tightened. During the tightening process, the second flange 21 swings accordingly and fits parallel to the second sealing ring 22, thereby realizing the connection between the first high-pressure pipeline 100 and the second high-pressure pipeline 200. At this time, the end faces of any two adjacent components of the first flange 11, the positioning flange 12, the first sealing ring 13, the second sealing ring 22 and the second flange 21 are parallel and close to each other (see Figure 2 ), and with the cooperation of the sealing ring 3, the sealing ring 3 can be evenly compressed to avoid the problem of local compression of the sealing ring 3 causing leakage of high-pressure materials, thereby ensuring the sealing performance between the first high-pressure pipeline 100 and the second high-pressure pipeline 200.

[0037] That is to say, the connection structure for high-pressure pipelines provided in an embodiment of the present invention can not only realize the connection between the first high-pressure pipeline 100 and the second high-pressure pipeline 200, but also realize uniform compression of the sealing ring 3 when the fitting surfaces of the two flanges are not parallel, thereby ensuring the sealing performance between the first high-pressure pipeline 100 and the second high-pressure pipeline 200.

[0038] It is easy to understand that the first groove 121 serves to position the first sealing ring 13. The installation of the positioning flange 12 can provide the first groove 121, avoiding the need for grooves in the first flange 11, which has a smaller thickness, thereby increasing the structural strength of the first flange 11. Furthermore, the second groove 122 can position the second sealing ring 22, thereby constraining it within the second groove 122 during rotation, preventing significant misalignment between the inner holes of the second sealing ring 22 and the first sealing ring 13, which could affect the connected cross-sectional area.

[0039] Furthermore, during use after the connection structure is installed, if a new different tilt angle is formed between the planes of the first flange 11 and the second flange 21, this tilt angle can also be compensated by adjusting and rotating the second sealing ring 22, thereby ensuring that the end faces of the components are parallel and aligned, and ensuring uniform compression of the sealing ring 3. In other words, the connection structure provided by the present invention can compensate for any different tilt angle between the first flange 11 and the second flange 21 by rotating the second sealing ring 22.

[0040] For example, the adjustment angle of the second sealing ring 22 may be 0-5°.

[0041] It should be noted that the inner diameters of the first flange 11 , the positioning flange 12 , the first sealing ring 13 , the second sealing ring 22 and the second flange 21 are consistent, thereby ensuring the connection cross-sectional area of the high-pressure material at the pipeline connection.

[0042] Continue to see Figure 1 The end surface of the first flange 11 facing the positioning flange 12 has a first flange 111, and the end surface of the positioning flange 12 facing the first flange 11 has a first positioning groove, and the first flange 111 is coaxially inserted into the first positioning groove.

[0043] In this embodiment, the first positioning groove cooperates with the first flange 111 to achieve positioning of the positioning flange 12 and the first flange 11, thereby ensuring the coaxiality of the first flange 11 and the positioning flange 12 when connected and avoiding misalignment between the two.

[0044] Furthermore, a plurality of second bolts 112 are inserted into the first flange 11 , and the plurality of second bolts 112 are arranged at intervals along the circumference of the first flange 11 to connect the positioning flange 12 .

[0045] In the above embodiment, the first flange 11 and the positioning flange 12 can be reliably connected by the second bolts 112 .

[0046] In other embodiments of the present invention, the first flange 11 and the positioning flange 12 may also be connected by welding, which is not limited in the present invention.

[0047] Figure 3 : is a schematic structural diagram of the second flange provided in an embodiment of the present invention, such as Figure 3 As shown, the second flange 21 has a plurality of through holes 211 , which are spaced apart along the circumference of the second flange 21 . Each first bolt 23 is inserted into the corresponding through hole 211 , and the first bolt 23 is clearance-fitted with the through hole 211 .

[0048] In the above embodiment, the second flange 21 can be easily swung through the multiple through holes 211 so that the second flange 21 and the second sealing ring 22 are parallel and fit together, thereby preventing the first bolts 23 from interfering with the second flange 21 .

[0049] Exemplarily, the through holes 211 may be waist-shaped holes, and each waist-shaped hole extends along the radial direction of the second flange 21 , thereby facilitating the swinging of the second flange 21 .

[0050] In one implementation of the present invention, Figure 4 FIG. 1 is a schematic diagram of the assembly of the convex ball pad and the concave ball pad provided in an embodiment of the present invention, as shown in FIG. Figure 4 As shown, the top movable sleeve of each first bolt 23 is provided with a convex ball pad 231 and a concave ball pad 232 that cooperate with each other, and the parallel end surface of each convex ball pad 231 fits with the bottom surface of the nut of the first bolt 23, and the parallel end surface of the concave ball pad 232 fits with the other end surface of the second flange 21.

[0051] In the above embodiment, through the cooperation of the convex ball pad 231 and the concave ball pad 232, the contact area of the bottom surface of the nut of the first bolt 23 can be increased, which facilitates uniform action on the second flange 21 and avoids the problem of point contact between the nut and the top surface of the second flange 21 during the swinging of the second flange 21, thereby avoiding stress concentration.

[0052] Exemplarily, both the convex ball pad 231 and the concave ball pad 232 are loosely matched with the corresponding first bolt 23 , so as to facilitate the adjustment and swing of the convex ball pad 231 and the concave ball pad 232 .

[0053] For example, the top surface of the convex ball pad 231 and the bottom surface of the concave ball pad 232 are parallel end surfaces that can mate parallel to the bottom surface of the nut or the top surface of the second flange 21. The bottom surface of the convex ball pad 231 and the top surface of the concave ball pad 232 are both curved end surfaces that mate and mate with each other to adjust the inclination angle of the top surface of the convex ball pad 231 and the bottom surface of the concave ball pad 232.

[0054] In this embodiment, one end surface of the second flange 21 has a second flange 212 , and one end surface of the second sealing ring 22 has a second positioning groove, and the second flange 212 can be movably inserted into the second positioning groove.

[0055] In the above embodiment, the second flange 212 and the second positioning groove can also achieve positioning between the second flange 21 and the second sealing ring 22, ensuring the coaxiality of the second flange 21 and the second sealing ring 22 when inserted, and avoiding misalignment between the two.

[0056] In one implementation of the present invention, the outer peripheral wall of the second sealing ring 22 has a plurality of drive grooves 222 arranged at intervals, and each drive groove 222 is arranged along the radial direction of the second sealing ring 22 .

[0057] In the above embodiment, the second sealing ring 22 can be easily rotated by inserting a steel rod into the driving groove 222 , thereby easily adjusting the second inclined surface 221 of the second sealing ring 22 to be parallel to the first inclined surface 131 of the first sealing ring 13 .

[0058] Furthermore, each sealing ring 3 includes a first sealing ring 31 and a second sealing ring 32 , and the inner diameter of the first sealing ring 31 is greater than the outer diameter of the second sealing ring 32 .

[0059] In the above embodiment, a double sealing ring combination is realized by the first sealing ring 31 and the second sealing ring 32 , which serve as backup for each other, thereby increasing the sealing performance between any two adjacent components.

[0060] Exemplarily, both ends of the inner holes of the first flange 11 , the positioning flange 12 , the first sealing ring 13 , the second sealing ring 22 and the second flange 21 have rounded corners, thereby reducing fluid resistance.

[0061] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A connection structure for a high-pressure pipeline, characterized in that: The connection structure comprises a driven component (1) and a driving component (2); The driven assembly (1) comprises a first flange (11), a positioning flange (12) and a first sealing ring (13); the first flange (11) and the positioning flange (12) are coaxially fixedly connected; the end surface of the positioning flange (12) facing away from the first flange (11) comprises a T-shaped groove; the T-shaped groove comprises a first groove body (121) and a second groove body (122); the outer diameter of the first groove body (121) is smaller than that of the second groove body (122); the first sealing ring (13) is inserted into the first groove body (121); and the end of the first sealing ring (13) facing away from the first flange (11) comprises a first inclined surface (131); The active component (2) comprises a second flange (21), a second sealing ring (22) and a plurality of first bolts (23); one end of the second flange (21) is movably coaxially inserted into one end of the second sealing ring (22); the other end of the second sealing ring (22) has a second inclined surface (221); the second inclined surface (221) has the same inclination angle as the first inclined surface (131); the other end of the second sealing ring (22) is movably inserted into the second groove body (122); the plurality of first bolts (23) are movably inserted into the second flange (21), and the plurality of first bolts (23) are arranged at intervals to connect the positioning flange (12); A sealing ring (3) is sequentially sandwiched between the first flange (11), the positioning flange (12), the first sealing ring (13), the second sealing ring (22) and the second flange (21).

2. A connection structure for a high-pressure pipeline according to claim 1, characterized in that: The end surface of the first flange (11) facing the positioning flange (12) has a first flange (111), the end surface of the positioning flange (12) facing the first flange (11) has a first positioning groove, and the first flange (111) is coaxially inserted in the first positioning groove.

3. A connection structure for a high-pressure pipeline according to claim 2, characterized in that: A plurality of second bolts (112) are inserted into the first flange (11), and the plurality of second bolts (112) are arranged at intervals along the circumference of the first flange (11) to connect the positioning flange (12).

4. The connection structure for a high-pressure pipeline according to claim 1, characterized in that: The second flange (21) has a plurality of through holes (211), and the plurality of through holes (211) are arranged at intervals along the circumference of the second flange (21), and each of the first bolts (23) is inserted into the corresponding through hole (211), and the first bolt (23) is clearance-fitted with the through hole (211).

5. A connection structure for a high-pressure pipeline according to claim 4, characterized in that: The top movable sleeve of each first bolt (23) is provided with a convex ball pad (231) and a concave ball pad (232) that cooperate with each other, and the parallel end surface of each convex ball pad (231) is in contact with the bottom surface of the nut of the first bolt (23), and the parallel end surface of the concave ball pad (232) is in contact with the other end surface of the second flange (21).

6. The connection structure for a high-pressure pipeline according to claim 4, characterized in that: The through holes (211) are waist-shaped holes, and each waist-shaped hole extends along the radial direction of the second flange (21).

7. The connection structure for a high-pressure pipeline according to claim 1, characterized in that: One end surface of the second flange (21) has a second flange (212), and one end surface of the second sealing ring (22) has a second positioning groove, and the second flange (212) can be movably inserted into the second positioning groove.

8. A connection structure for a high-pressure pipeline according to any one of claims 1 to 7, characterized in that: The outer peripheral wall of the second sealing ring (22) has a plurality of drive grooves (222) arranged at intervals, and each of the drive grooves (222) is arranged along the radial direction of the second sealing ring (22).

9. A connection structure for a high-pressure pipeline according to any one of claims 1 to 7, characterized in that: Each of the sealing rings (3) comprises a first sealing ring (31) and a second sealing ring (32), wherein the inner diameter of the first sealing ring (31) is greater than the outer diameter of the second sealing ring (32).

10. A connection structure for a high-pressure pipeline according to any one of claims 1 to 7, characterized in that: Both ends of the inner holes of the first flange (11), the positioning flange (12), the first sealing ring (13), the second sealing ring (22) and the second flange (21) have rounded corners.

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