Anti-leakage flaring type pipe joint

Abstract

The utility model discloses an anti-leakage flaring type pipe joint which comprises a joint body, a pipeline, a locking nut, an annular groove, an elastic compensation ring and an annular elastic piece. The end part of the joint body is connected with a pipeline, and the outer wall of the pipeline is sleeved with a locking nut; an annular groove is formed in the conical surface of the connector body, an elastic compensation ring with a U-shaped section is embedded in the annular groove, and an opening of the elastic compensation ring faces the fluid pressure direction. An annular elastic piece is arranged at the end, close to the thread, of the inner wall of the locking nut, sawtooth-shaped protrusions are arranged on the inner wall of the annular elastic piece and distributed along the circumference of the inner wall of the annular elastic piece, the tooth tips of the sawtooth-shaped protrusions face the screwing direction, and the tooth tips of the sawtooth-shaped protrusions are in one-way engagement with the outer thread of the connector body. The sealing performance between the joint and a pipeline can be improved, and meanwhile the firmness of the nut is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of pipe fittings, and in particular to the technical field of a leak-proof flared pipe fitting. Background Technology

[0002] Flared pipe fittings are made by flaring the end of the pipe into a bell shape, which fits with the conical surface of the fitting to form a metal seal. This design eliminates the need for welding, saving subsequent pickling, flaw detection and other processes, and is quick and easy to install.

[0003] Currently, when pipe fittings are used to transmit special media, the weld seams on their inner surfaces are not very corrosion-resistant and wear-resistant, and are easily damaged. They often need to be replaced frequently during operation, which not only affects normal operation and reduces work efficiency, but also increases the cost of using pipe fittings.

[0004] To address the problems mentioned above, for example, application number CN201020681683.9 discloses a corrosion-resistant and wear-resistant pipe joint, a welded multi-way joint. The inner surface of the pipe joint is uniformly coated with a protective coating. The pipe joint is made of stainless steel, carbon steel, or cast steel. The protective coating is made of nickel-based, cobalt-based, or iron-based alloy powder materials or nickel-based, cobalt-based, or iron-based alloy flux-cored wires. By uniformly distributing the protective coating on the inner surface of the pipe joint substrate, direct contact between the corrosive medium and the inner surface of the pipe joint substrate can be avoided when the pipe joint is transmitting corrosive media. This significantly improves the corrosion and wear resistance of the weld seam and the entire inner surface of the substrate, increasing its service life. Furthermore, using nickel-based, cobalt-based, or iron-based alloy powder materials or nickel-based, cobalt-based, or iron-based alloy flux-cored wires to make the protective coating not only improves the corrosion and wear resistance of the pipe joint but also facilitates better integration of the protective coating with the pipe joint substrate.

[0005] However, the above structure still has the following drawbacks:

[0006] The overall strength of the structure is insufficient, making it prone to joint cracking.

[0007] To address the problems mentioned above, for example, application number CN202122121010.9 discloses a high-strength vibration-damping pipe joint, including a rubber hose. The rubber hose is made of rubber. The high-strength vibration-damping pipe joint also includes a high-strength integrated joint structure located at both ends of the rubber hose for stable assembly of the rubber hose. The high-strength integrated joint structure includes mounting flanges at both ends of the rubber hose. A pipe connection flange is located on the side of the mounting flanges that are far apart from each other. The pipe connection flange and the mounting flange are provided with positioning components for the installation and positioning of the pipe connection flange. By setting up the integrated joint structure and using the positioning components, the rapid assembly of the overall structure is ensured. At the same time, the pipe connection flange made of carbon steel is used as the contact surface to ensure the overall structural strength.

[0008] However, the above structure still has the following drawbacks:

[0009] Because this connector uses a threaded connection to the pipe, its sealing performance is poor, making it prone to leakage. Additionally, the nut is susceptible to loosening. Summary of the Invention

[0010] The purpose of this invention is to solve the problems in the prior art by proposing a leak-proof flared pipe joint that can improve the sealing performance between the joint and the pipe, while also increasing the firmness of the nut.

[0011] To achieve the above objectives, this utility model proposes a leak-proof flared pipe fitting, comprising a fitting body, a pipe, a locking nut, an annular groove, an elastic compensation ring, and an annular elastic plate; the end of the fitting body is connected to a pipe, and a locking nut is fitted onto the outer wall of the pipe; an annular groove is provided on the conical surface of the fitting body, and an elastic compensation ring with a U-shaped cross-section is embedded in the annular groove, the opening of the elastic compensation ring facing the direction of fluid pressure; an annular elastic plate is provided on the inner wall of the locking nut near the threaded end, and the inner wall of the annular elastic plate is provided with serrated protrusions.

[0012] Preferably, the serrated protrusions are distributed circumferentially along the inner wall of the annular elastic sheet, with the tips of the serrated protrusions facing the tightening direction, and the tips of the serrated protrusions engaging unidirectionally with the external thread of the connector body.

[0013] Preferably, the inner wall of the locking nut is provided with a limiting step for limiting the deformation range of the annular elastic sheet.

[0014] Preferably, the connector body has two threaded holes arranged symmetrically at the top and bottom. A threaded post is threaded into each threaded hole, one end of which is connected to a handle, and the other end of which is connected to a pointed part.

[0015] Preferably, the locking nut has two slots corresponding to the threaded holes, and the slots are used in conjunction with the pointed part.

[0016] Preferably, the inner wall of the flared end of the pipe and the sealing contact surface of the joint body are processed with a biomimetic microtexture, which is a continuous array of fish-scale-shaped pits.

[0017] The beneficial effects of this utility model are:

[0018] This invention improves the sealing performance between the joint and the pipeline through the combined action of a locking nut, annular groove, elastic compensating ring, and annular elastic plate. During installation, the locking nut presses against the flared end of the pipeline, compressing and deforming the elastic compensating ring to fill the microscopic gap between the flared end and the joint body. Fluid pressure acts on the open side of the elastic compensating ring, pushing it to further conform to the wall of the annular groove, forming a pressure self-tightening seal. When the pipeline vibrates or expands and contracts due to thermal expansion and contraction, the elastic compensating ring absorbs displacement through elastic deformation, preventing leakage caused by separation of the sealing surface. When the locking nut is tightened, the annular elastic plate bends in the tightening direction due to the thread compression, resulting in low resistance. When loosening in the opposite direction, the serrated protrusions engage with the thread to form resistance and inhibit retraction. Attached Figure Description

[0019] Figure 1 This is a front view of a leak-proof flared pipe joint according to this utility model;

[0020] Figure 2 This is a schematic diagram of a nut for a leak-proof flared pipe joint according to this utility model;

[0021] Figure 3 This is an exploded view of a leak-proof flared pipe joint according to this utility model;

[0022] Figure 4 This is a schematic diagram of the threaded post and pointed part of a leak-proof flared pipe joint according to this utility model;

[0023] In the figure: 1-Connector body, 2-Pipe, 3-Locking nut, 4-Annular groove, 5-Elastic compensation ring, 6-Annular elastic sheet, 601-Serrated protrusion, 7-Limiting step, 8-Threaded hole, 9-Threaded post, 10-Handle, 11-Pointed part, 12-Slot, 13-Microtexture. Detailed Implementation

[0024] See Figures 1 to 4This utility model discloses a leak-proof flared pipe fitting, comprising a fitting body 1, a pipe 2, a locking nut 3, an annular groove 4, an elastic compensation ring 5, and an annular elastic plate 6. The pipe 2 is connected to the end of the fitting body 1, and the locking nut 3 is fitted onto the outer wall of the pipe 2. An annular groove 4 is provided on the conical surface of the fitting body 1, and an elastic compensation ring 5 with a U-shaped cross-section is embedded within the annular groove 4, with the opening of the elastic compensation ring 5 facing the direction of fluid pressure. An annular elastic plate 6 is provided on the inner wall of the locking nut 3 near the threaded end, and the inner wall of the annular elastic plate 6 has serrated protrusions 601. During installation, the locking nut 3 presses against the flared end of the pipe 2, compressing and deforming the elastic compensation ring 5 to fill the microscopic gap between the flared end and the fitting body 1. Fluid pressure acts on the open side of the elastic compensation ring 5, pushing it to further conform to the wall of the annular groove 4, forming a pressure self-tightening seal. When the pipe 2 vibrates or expands and contracts due to thermal expansion and contraction, the elastic compensation ring 5 absorbs displacement through elastic deformation, preventing leakage caused by separation of the sealing surface.

[0025] See Figure 2 The serrated protrusions 601 are distributed circumferentially along the inner wall of the annular elastic sheet 6. The tips of the serrated protrusions 601 face the tightening direction. The tips of the serrated protrusions 601 form a one-way engagement with the external thread of the connector body 1. When the locking nut 3 is tightened, the annular elastic sheet 5 is squeezed by the thread and bends in the tightening direction, resulting in low resistance. When loosening in the opposite direction, the tips of the serrated protrusions 601 engage with the thread to form resistance and suppress retraction.

[0026] See Figure 2 The inner wall of the locking nut 3 is provided with a limiting step 7 for limiting the deformation range of the annular elastic piece 6.

[0027] See Figures 2 to 4 The connector body 1 has two threaded holes 8, which are arranged symmetrically at the top and bottom. A threaded post 9 is threaded into the threaded hole 8. One end of the threaded post 9 is connected to a handle 10, and the other end of the threaded post 9 is connected to a pointed part 11. When the locking nut 3 is installed on the connector body 1, the handle 10 is rotated, which causes the handle 10 to drive the threaded post 9 to rotate in the threaded hole 8, thereby driving the pointed part 11 to move towards the locking nut 3.

[0028] See Figure 2 The locking nut 3 has two slots 12 corresponding to the threaded holes 8. The slots 12 are used in conjunction with the pointed part 11. The rotation of the handle 10 drives the threaded post 9 to rotate in the threaded hole 8, so that the pointed part 11 can be embedded into the slots 12 on the locking nut 3, thereby achieving a tight connection between the locking nut 3 and the connector body 1 and further improving the firmness.

[0029] See Figure 3The inner wall of the flared end of the pipe 2 and the sealing contact surface of the joint body 1 are processed with a biomimetic micro-texture 13. The micro-texture 13 is a continuous array of fish scale-shaped pits. The micro-texture 13 forms tiny cavities, which increases the resistance of the fluid permeation path. The pits can store a small amount of lubricating medium, reducing friction and wear on the sealing surface. Through the optimization of the surface microstructure, the static and dynamic sealing performance is further improved.

[0030] The working process of this utility model:

[0031] In the operation of this leak-proof flared pipe joint, during installation, the locking nut 3 presses the flared end of the pipe 2, and the elastic compensation ring 5 is compressed and deformed to fill the microscopic gap between the flared end and the joint body 1. The fluid pressure acts on the open side of the elastic compensation ring 5, pushing it to further conform to the wall of the annular groove 4, forming a pressure self-tightening seal. When the pipe 2 vibrates or expands and contracts due to heat, the elastic compensation ring 5 absorbs displacement through elastic deformation, avoiding leakage caused by the separation of the sealing surface. When the locking nut 3 is tightened, the annular elastic piece 6 is bent in the tightening direction by the thread compression, with low resistance. When loosening in the opposite direction, the tooth tip of the serrated protrusion 601 bites with the thread to form resistance, inhibiting backflow. The rotation of the handle 10 drives the threaded post 9 to rotate in the threaded hole 8, so that the pointed part 11 can be embedded into the slot 12 on the locking nut 3, thereby achieving a tight connection between the locking nut 3 and the joint body 1, further improving the firmness.

[0032] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A leak resistant flared pipe joint, characterized by: The device includes a connector body (1), a pipe (2), a locking nut (3), an annular groove (4), an elastic compensation ring (5), and an annular elastic plate (6). The end of the connector body (1) is connected to the pipe (2), and the outer wall of the pipe (2) is fitted with a locking nut (3). The conical surface of the connector body (1) is provided with an annular groove (4), and the annular groove (4) is embedded with an elastic compensation ring (5) with a U-shaped cross section. The opening of the elastic compensation ring (5) faces the direction of fluid pressure. The inner wall of the locking nut (3) is provided with an annular elastic plate (6) near the threaded end, and the inner wall of the annular elastic plate (6) is provided with a serrated protrusion (601).

2. A leak resistant flared pipe joint as defined in claim 1, wherein: The serrated protrusions (601) are distributed circumferentially along the inner wall of the annular elastic sheet (6). The tips of the serrated protrusions (601) face the tightening direction. The tips of the serrated protrusions (601) form a one-way engagement with the external thread of the connector body (1).

3. A leak resistant flared pipe joint as defined in claim 1 wherein: The inner wall of the locking nut (3) is provided with a limiting step (7) for limiting the deformation range of the annular elastic sheet (6).

4. A leak resistant flared pipe joint as defined in claim 1 wherein: The connector body (1) has two threaded holes (8) arranged symmetrically at the top and bottom. A threaded post (9) is threaded inside the threaded hole (8). One end of the threaded post (9) is connected to a handle (10), and the other end of the threaded post (9) is connected to a pointed part (11).

5. A leak resistant flared pipe joint as defined in claim 4 wherein: The locking nut (3) has two slots (12) corresponding to the threaded holes (8), and the slots (12) are used in conjunction with the pointed part (11).

6. A leak resistant flared pipe joint as defined in claim 1 wherein: The inner wall of the flared end of the pipe (2) and the sealing contact surface of the connector body (1) are processed with a biomimetic micro-texture (13), which is a fish-scale-shaped continuous pit array.

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