Connecting structure of elbow joint
By designing a double sealing structure and a special toothed ring engagement on the bend joint, the problem of insufficient sealing performance of the bend joint is solved, achieving sealing performance and shear resistance under high pressure media, and improving the mechanical properties of the bend.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHUJI XIANGJIA MASCH CO LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-05-15
AI Technical Summary
Existing pipe bend joints have poor sealing performance and are prone to leakage risks, especially in high-pressure media environments.
It adopts a dual sealing structure, including an axial sealing structure and an end face sealing structure, and enhances sealing performance and shear resistance through asymmetrical trapezoidal toothed ring meshing and limiting boss design.
It achieves double sealing in high-pressure media environments to prevent leakage, and prevents loosening and rotation through a special toothed ring design, thereby improving the mechanical properties and installation accuracy of the bend.
Smart Images
Figure CN224245707U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of pipe fittings technology, and in particular to a connection structure for a bend pipe joint. Background Technology
[0002] Flange-type bend connections are a very common technical method in the current technology. The technical difficulty of existing bend joints lies in their poor sealing performance. For example, the bend joint proposed in Chinese invention patent CN110985797A mainly uses two mating flanges for bolt fastening, with a gasket between the two flanges. This type of single sealing surface is highly dependent on the connection and fit of the gasket. For example, uneven gasket thickness, uneven bolt tightening force, and gasket aging can all lead to leakage risks. Summary of the Invention
[0003] Based on this, this application provides a connection structure for a pipe bend joint, which solves the above-mentioned technical problems.
[0004] The technical solution adopted by this application to solve its technical problem is: a connection structure for a bend joint, including a bend body and a flange connection part disposed at the end of the bend body. The outer sides of the flange connection parts at both ends of the bend body are respectively provided with loose flanges. An axial sealing structure is provided between the inner wall of the loose flange and the outer wall of the bend body. At the same time, an end face sealing structure is provided between the end face of the bend body and the mating surface of the loose flange, forming a double sealing channel.
[0005] The axial sealing structure includes an annular protrusion on the outer wall of the bend body and an annular groove on the inner wall of the loose flange. An O-ring is embedded in the annular groove, and the annular protrusion presses the O-ring to form a radial seal.
[0006] The end-face sealing structure includes a tapered sealing surface on the end face of the bend body and a tapered mating surface on the butt flange mating surface. The two surfaces are tapered and pressed together to form a seal by bolts.
[0007] As one embodiment, the outer edge of the flange connection of the bend body is provided with an anti-rotation toothed ring, and the inner end face of the loose flange is provided with a toothed groove ring that meshes with it, so as to prevent relative rotation after installation by locking through tooth meshing.
[0008] As one embodiment, the tooth profile of the anti-rotation tooth ring and the tooth groove ring is an asymmetrical trapezoidal tooth, with a tooth groove inclination angle of 30°-45° and a tooth surface inclination angle of 10°-15°.
[0009] In one embodiment, the loose flange is provided with symmetrical limiting bosses on its outer circumference, and the inner wall of the limiting bosses is provided with a buffer rubber layer.
[0010] As one embodiment, the bending area of the main body of the bend adopts a gradual wall thickness design, with the outer wall thickness of the bend being 15%-20% greater than that of the straight pipe section, and the inner wall thickness of the bend being 15%-20% greater than that of the straight pipe section.
[0011] The beneficial effects of this application are as follows:
[0012] 1. By using axial and end face double sealing, the problem of easy failure of single seal is solved.
[0013] 2. Through the asymmetrical toothed ring meshing at a special angle, it ensures installation accuracy while preventing loosening and rotation, and the trapezoidal tooth design enhances shear resistance.
[0014] 3. The combination of the limiting boss and the buffer layer ensures the flange alignment accuracy while reducing assembly impact damage.
[0015] 4. The gradual wall thickness design inside the bend improves the mechanical properties of the bend. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the external structure of this application.
[0018] Figure 2 This is a schematic diagram of the internal structure of this application.
[0019] Figure 3 This application is Figure 1 Schematic diagram of the AA direction.
[0020] Figure 4 This application includes a schematic diagram of the loose flange and toothed ring structure.
[0021] Figure 5 This is a schematic diagram of the elevation structure of this application.
[0022] Reference numerals: 1. Bend body, 11. Annular protrusion, 12. Conical sealing surface, 13. Bending area, 2. Flange connection, 21. Anti-rotation toothed ring, 3. Loose flange, 31. Annular groove, 32. Conical mating surface, 33. Toothed ring, 34. Limiting boss, 4. O-ring seal. Detailed Implementation
[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In addition, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those of ordinary skill in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection of this application.
[0024] This embodiment provides a connection structure for a pipe bend joint.
[0025] like Figure 1 and 2 As shown, the two ends of the bend body 1 are integrally formed with flange connection parts 2. The bend body 1 includes a bend section and a straight pipe section. The straight pipe section is fitted with a movable loose flange 3, which is used to connect other pipe joints that need to be connected externally.
[0026] The inner wall of the slip-on flange 3 is provided with an axial sealing structure between it and the outer wall of the bend body 1. At the same time, the end face of the bend body 1 is provided with an end face sealing structure between it and the mating surface of the slip-on flange 3. Together, they form a double sealing channel, which blocks the fluid leakage path.
[0027] Specifically, the axial sealing structure includes an annular protrusion 11 on the outer wall of the bend body 1 and an annular groove 31 on the inner wall of the loose flange 3. An O-ring is embedded in the annular groove 31, and the annular protrusion 11 presses the O-ring to form a radial seal.
[0028] The end-face sealing structure includes a tapered sealing surface 12 located on the end face of the bend body 1 and a tapered mating surface 32 on the mating surface of the loose flange 3. The two surfaces are tapered and pressed together to form a seal by bolts.
[0029] In addition, under pipeline vibration conditions, axial sealing can compensate for the micro-displacement of the end face seal and prevent leakage of high-pressure media (such as hydraulic oil ≥10MPa).
[0030] Reference Figure 3-4 In a further embodiment, the outer edge of the flange connection 2 of the bend body 1 is provided with an anti-rotation toothed ring 21 (tooth height 2-3mm), and the inner end face of the loose flange 3 is milled with a corresponding meshing toothed groove ring 33, which prevents relative rotation after installation by tooth meshing and locking.
[0031] Furthermore, the anti-rotation toothed ring 21 and the toothed groove ring 33 have asymmetrical trapezoidal teeth, with a tooth groove angle of 30°-45° to reduce assembly resistance and a tooth surface angle of 10°-15° to increase torsional resistance torque. During installation, the anti-rotation toothed ring 21 engages and locks with the toothed groove ring 33 to prevent the loose flange 3 from loosening circumferentially.
[0032] Reference Figure 5 As shown, in addition, an integrally formed limiting boss 34 is provided on the outer circumference of the loose flange 3, and a buffer rubber layer is bonded to the inner wall of the limiting boss 34. In this way, the limiting boss 34 is used to guide the insertion of the external pipeline flange during assembly, and the buffer rubber layer plays a role in sealing and vibration buffering.
[0033] Furthermore, the bending region 13 of the main body 1 of the bend adopts a gradually increasing wall thickness design, with the outer wall thickness of the bend being 15%-20% greater than that of the straight pipe section, and the inner wall thickness of the bend being 15%-20% greater than that of the straight pipe section. This can effectively improve the mechanical properties of the bend.
[0034] The various embodiments of this application have now been described in detail. To avoid obscuring the concept of this application, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.
[0035] Finally, it should be noted that the above description is only a preferred embodiment of this application. The foregoing embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A connection structure for a pipe bend joint, comprising a pipe bend body and a flange connection portion disposed at the end of the pipe bend body, characterized in that, The outer sides of the flange connection at both ends of the bend body are respectively provided with loose flanges. An axial sealing structure is provided between the inner wall of the loose flange and the outer wall of the bend body. At the same time, an end face sealing structure is provided between the end face of the bend body and the mating surface of the loose flange, forming a double sealing channel. The axial sealing structure includes an annular protrusion on the outer wall of the bend body and an annular groove on the inner wall of the loose flange. An O-ring is embedded in the annular groove, and the annular protrusion presses the O-ring to form a radial seal. The end-face sealing structure includes a tapered sealing surface on the end face of the bend body and a tapered mating surface on the butt flange mating surface. The two surfaces are tapered and pressed together to form a seal by bolts.
2. The connection structure of a pipe bend joint according to claim 1, characterized in that, The outer edge of the flange connection of the bend body is provided with an anti-rotation toothed ring, and the inner end face of the loose flange is provided with a toothed groove ring that meshes with it. The relative rotation is prevented by the tooth meshing and locking.
3. The connection structure of a pipe bend joint according to claim 2, characterized in that, The anti-rotation tooth ring and tooth groove ring have asymmetrical trapezoidal teeth with a tooth groove inclination angle of 30°-45° and a tooth surface inclination angle of 10°-15°.
4. The connection structure of a pipe bend joint according to claim 1, characterized in that, The outer circumference of the loose flange is symmetrically provided with limiting bosses, and the inner wall of the limiting bosses is provided with a buffer rubber layer.
5. The connection structure of a pipe bend joint according to claim 1, characterized in that, The bending area of the main body of the bend adopts a gradual wall thickness design, with the outer wall thickness of the bend being 15%-20% greater than that of the straight pipe section, and the inner wall thickness of the bend being 15%-20% greater than that of the straight pipe section.