Universal joint for pipe connection

Abstract

The invention discloses a universal joint for pipe connection, comprising a connecting sleeve and a locking cover, wherein the left end of the connecting sleeve is used to connect with a pipe, the inner and outer surfaces of the connecting sleeve are both provided with a spherical surface, a rotating assembly capable of universal rotation relative to the connecting sleeve is provided in the connecting sleeve, a hollow tube is provided on the rotating assembly, the right end of the hollow tube passes through the connecting sleeve to the right and is provided with a locking section for connecting with the locking cover and a pipe section for connecting with the pipe in sequence, the locking cover and the hollow tube are connected by threads, the left end of the locking cover is provided with a spherical surface having the same curvature as the outer surface of the right end of the connecting sleeve, the locking cover is used to adjust the fitting relationship between the rotating assembly and the inner surface of the connecting sleeve, when the locking cover is tightened, the inner surface of the left end of the locking cover fits with the outer surface of the right end of the connecting sleeve, and the outer surface of the rotating assembly fits tightly with the inner surface of the connecting sleeve. Not only can the universal connection between two pipes be ensured, but also the structure is simple, and the processing and maintenance are convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline connectors, and in particular relates to a universal joint for pipeline connection. Background Art

[0002] In order to facilitate the installation and arrangement of various pipelines and the connection of pipelines, two pipelines are connected through joints. Now, in order to achieve the connection of two pipelines at different angles, the pipelines are connected through a universal joint. The universal joint in the prior art usually consists of a valve body and a ball valve arranged inside the valve body and matching the inner surface of the ball. In order to facilitate the installation and fixation of the ball valve, the valve body is composed of two parts arranged oppositely. In order to ensure the sealing of the entire joint, the inner surface diameters of the two parts of the valve body are made the same. This structure increases the difficulty of processing the entire valve body. Summary of the invention

[0003] The present invention intends to provide a universal joint for pipe connection, which can not only ensure the universal connection between two pipes, but also has a simple structure and is convenient to manufacture and maintain.

[0004] To this end, the technical solution adopted by the present invention is: a universal joint for pipe connection, comprising a connecting sleeve and a locking cover, the left end of the connecting sleeve is used to connect to the pipe, the inner and outer surfaces of the connecting sleeve are both provided with spherical surfaces, a rotating component that can rotate universally relative to the connecting sleeve is provided in the connecting sleeve, a hollow tube is provided on the rotating component, and the right end of the hollow tube passes through the connecting sleeve to the right and is sequentially provided with a locking section for connecting to the locking cover and a pipe section for connecting to the pipe, the locking cover and the hollow tube are connected by threads, the left end of the locking cover is provided with a spherical surface with the same curvature as the outer surface of the right end of the connecting sleeve, and the locking cover is used to adjust the fitting relationship between the rotating component and the inner surface of the connecting sleeve, and when the locking cover is tightened, the inner surface of the left end of the locking cover fits with the outer surface of the right end of the connecting sleeve, and the outer surface of the rotating component fits tightly with the inner surface of the connecting sleeve.

[0005] As a preferred embodiment of the above scheme, the rotating assembly includes a curved rotor with a spherical outer surface, the outer diameter of the curved rotor is smaller than the inner diameter of the inner surface of the connecting sleeve, and the spherical curvature of the outer surface of the curved rotor is consistent with the curvature of the inner surface of the connecting sleeve, and a groove for installing a first sealing ring is provided on the curved rotor near the left side.

[0006] Further preferably, a connector is provided, the right end of which is connected to the left end of the connecting sleeve by a threaded connection, the left end is welded with a connecting section for connecting to a pipeline, and the connecting section is provided with an internal thread for connecting to a pipeline.

[0007] Further preferably, the hollow tube includes a rotor section, a transition section, a locking section, and a pipe section which are arranged in sequence from left to right, and the rotor section and the locking section are both provided with external threads for connecting to corresponding components, and the pipe section is provided with an internal thread for connecting to the pipe.

[0008] Further preferably, a first protrusion is provided between the rotor section and the transition section, and the first protrusion can extend into the connecting sleeve, and a second sealing ring for fitting with the rotating assembly is provided at the left end of the first protrusion.

[0009] Further preferably, a second protrusion is provided between the transition section and the locking section, an outer inclined surface is provided between the second protrusion and the locking section, and an inner inclined surface that fits the inclined surface is provided on the locking cover.

[0010] Beneficial effects of the present invention:

[0011] 1) The rotating assembly and the connecting sleeve are spherically fitted, and the locking cover and the connecting sleeve are also spherically fitted. Therefore, when one of the pipes rotates, the other pipe can remain unchanged, thereby realizing a universal connection between the pipes;

[0012] 2) The present application includes a connecting sleeve, a locking cover, a hollow tube and a rotating assembly, which has a simple structure and is easy to maintain. Compared with the prior art, it does not require two parts to be machined with spherical surfaces of the same size, thereby reducing the difficulty of machining and manufacturing;

[0013] 3) Since the hollow tube is arranged in the rotating assembly, and the rotating assembly is arranged in the connecting sleeve, the present application can be used for connecting two pipes with a large difference in diameter. At the same time, since a connecting head is provided, the present application can also be used for connecting two pipes with a small difference in diameter.

[0014] 4) When the present application is used in a pipe connection that is easily deformed or has poor coaxiality, the joint will rotate in real time with the direction of the pipe torque, thereby solving the problem of the existing joint being easily loosened. When used in a pipeline with frequent vibrations, the joint will rotate in real time with the shaking direction of the pipe, thereby having the effect of buffering and blocking the shaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the present invention.

[0016] Figure 2 It is a schematic diagram of the rotating assembly in the present invention.

[0017] Figure 3 Schematic diagram of the hollow core tube of the present invention.

[0018] Figure 4 It is a schematic diagram of the present invention after being rotated at a certain angle. DETAILED DESCRIPTION

[0019] The present invention will be further described below by way of embodiments and in conjunction with the accompanying drawings:

[0020] like Figure 1-Figure 4 As shown, a universal joint for pipe connection is mainly composed of a connecting sleeve 1, a locking cover 2, a hollow tube 3 and a rotating assembly, wherein the left end of the connecting sleeve 1 is used to connect with the pipe, the rotating assembly is arranged in the connecting sleeve 1, and can be universally rotated relative to the connecting sleeve. The left end of the hollow tube 3 is arranged on the rotating assembly, and the right end of the hollow tube 3 passes through the connecting sleeve 1 to the right and is sequentially provided with a locking section 3c for connecting with the locking cover 2 and a pipe section for connecting with the pipe, and the locking cover 2 and the hollow tube 3 are connected by threads.

[0021] In order to realize the universal rotation of the rotating assembly and the locking cover relative to the connecting sleeve, spherical surfaces are provided on the inner and outer surfaces of the connecting sleeve 1, and a spherical surface with the same curvature as the outer surface of the right end of the connecting sleeve 1 is provided on the left end of the locking cover 2, and a spherical surface with the same curvature as the inner surface of the connecting sleeve is provided on the outer surface of the rotating assembly. The locking cover 2 is also used to adjust the fitting relationship between the rotating assembly and the inner surface of the connecting sleeve 1. When the locking cover 2 is tightened, the inner surface of the left end of the locking cover 2 fits with the outer surface of the right end of the connecting sleeve 1, and the outer surface of the rotating assembly fits tightly with the inner surface of the connecting sleeve 1.

[0022] The specific structure of the rotating assembly includes a curved rotor 4 whose outer surface is a spherical surface, and the spherical curvature of the outer surface of the curved rotor 4 is consistent with the curvature of the inner surface of the connecting sleeve 1. In order to facilitate and reduce the difficulty of processing the curved rotor and the connecting sleeve, the outer diameter of the curved rotor 4 is smaller than the inner diameter of the inner surface of the connecting sleeve 1. In order to ensure the seal between the curved rotor 4 and the connecting sleeve, a groove for installing the first sealing ring 5 is provided on the curved rotor 4 near the left side.

[0023] Due to the large difference between the hollow tube and the connecting sleeve, this can realize the connection between two pipes with a large difference in inner diameter. In order to realize the connection between pipes with a small difference in inner diameter, a connecting head 6 is also provided. The right end of the connecting head 6 is connected to the left end of the connecting sleeve 1 through a threaded connection, and a connecting section 6a for connecting to the pipe is welded on the left end. An internal thread for connecting to the pipe is arranged in the connecting section 6a. By replacing the internal threads with different diameters, the present application can realize the connection of various pipe diameters.

[0024] The specific structure of the hollow tube 3 includes a rotor section 3a, a transition section 3b, a locking section 3c and a pipe section (not shown in the figure) arranged in sequence from left to right. The rotor section 3a and the locking section 3c are both provided with external threads for connecting with corresponding parts, and the pipe section is provided with internal threads for connecting with the pipe. In order to realize the connection between the universal joint and the pipe, a flange can be welded on the left end of the pipe section and the connecting sleeve or the connecting section of the connecting head, and connected with the corresponding pipe through the flange; or a pipe clamp is provided, one end of the pipe clamp is provided with an internal thread, and the other end is provided with a locking section with a diameter gradually decreasing outwards, and at the same time, an external thread matching the internal thread of the pipe clamp is provided on the pipe section, the left end of the connecting sleeve or the connecting section of the connecting head, so that the pipe can be pressed by the pipe clamp when it extends into the pipe section, the left end of the connecting sleeve or the connecting section of the connecting head.

[0025] In order to ensure the seal between the curved rotor and the hollow tube, a first protrusion 3e is provided between the rotor section 3a and the transition section 3b, and the first protrusion 3e can extend into the connecting sleeve 1. A second sealing ring 7 for fitting with the rotating component is provided at the left end of the first protrusion 3e. It is best to provide an inner groove capable of inserting the second sealing ring at the right end of the threaded hole for installing the rotor section on the curved rotor.

[0026] In order to facilitate limiting the tightening position of the locking cover, a second protrusion 3d is provided between the transition section 3b and the locking section 3c. In order to ensure that the hollow tube is not damaged during tightening, the step surface on the second protrusion 3d connected to the locking section 3c is set as an outer bevel. At the same time, an inner bevel that fits with the bevel is provided on the locking cover 2. The setting of the bevel can increase the thickness of the hollow tube for fitting with the locking cover.

Claims

1. A universal joint for pipe connection, characterized in that: The invention comprises a connecting sleeve (1) and a locking cover (2), wherein the left end of the connecting sleeve (1) is used for connecting with a pipeline, the inner and outer surfaces of the connecting sleeve (1) are both provided with spherical surfaces, a rotating assembly capable of universal rotation relative to the connecting sleeve is provided inside the connecting sleeve (1), a hollow tube (3) is provided on the rotating assembly, the right end of the hollow tube (3) passes through the connecting sleeve to the right and is provided with a locking section (3c) for connecting with the locking cover (2) and a pipeline section for connecting with the pipeline in sequence, the locking cover (2) and the hollow tube (3) are connected by threads, the left end of the locking cover (2) is provided with a spherical surface having the same curvature as the outer surface of the right end of the connecting sleeve (1), the locking cover (2) is used to adjust the fitting relationship between the rotating assembly and the inner surface of the connecting sleeve (1), when the locking cover (2) is tightened, the inner surface of the left end of the locking cover (2) fits with the outer surface of the right end of the connecting sleeve (1), and the outer surface of the rotating assembly fits tightly with the inner surface of the connecting sleeve (1); The rotating assembly comprises a curved rotor (4) having a spherical outer surface, the outer diameter of the curved rotor (4) being smaller than the inner diameter of the inner surface of the connecting sleeve (1), and the spherical curvature of the outer surface of the curved rotor (4) being consistent with the curvature of the inner surface of the connecting sleeve (1), and a groove for mounting a first sealing ring (5) is provided at a position close to the left side of the curved rotor (4); The hollow tube (3) comprises a rotor section (3a), a transition section (3b), a locking section (3c) and a pipe section which are arranged in sequence from left to right; the rotor section (3a) and the locking section (3c) are both provided with external threads for connecting to corresponding parts, and the pipe section is provided with internal threads for connecting to a pipe.

2. The universal joint for pipe connection according to claim 1, characterized in that: A connecting head (6) is also provided, the right end of the connecting head (6) being connected to the left end of the connecting sleeve (1) via a threaded connection, the left end being welded with a connecting section (6a) for connecting to a pipeline, and the connecting section (6a) being provided with an internal thread for connecting to a pipeline.

3. The universal joint for pipe connection according to claim 1, characterized in that: A first protrusion (3e) is provided between the rotor section (3a) and the transition section (3b), and the first protrusion (3e) can extend into the connecting sleeve (1), and a second sealing ring (7) for fitting with the rotating component is provided at the left end of the first protrusion (3e).

4. The universal joint for pipe connection according to claim 1, characterized in that: A second protrusion (3d) is provided between the transition section (3b) and the locking section (3c), and an outer inclined surface is provided between the second protrusion (3d) and the locking section (3c); an inner inclined surface that fits the inclined surface is provided on the locking cover (2).

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