Multi-ball-core spherical joint

Abstract

The multi-ball-core spherical joint comprises a spherical shell, ball cores and a sealing structure, a pressing flange is arranged at the top end of the spherical shell, a groove is formed in the inner wall of the spherical shell, the ball cores comprise a main ball core and a plurality of supporting ball cores, the main ball core is arranged in the spherical shell, the supporting ball cores are embedded in the groove in the inner wall of the spherical shell, and the sealing structure is arranged in the main ball core. And the sealing structure is arranged in the inner wall of the spherical shell and is in close contact with the main spherical core. The supporting ball cores are arranged in the ball shell and evenly distributed around the main ball core to make contact with the main ball core, the load of the main ball core is dispersed to the supporting ball cores, local concentrated stress of the main ball core is reduced, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline compensator technical field especially relates to a multi -ball core spherical joint. BACKGROUND

[0002] In modern industrial production and mechanical equipment, it is often necessary to realize the relative rotation connection between different components in three-dimensional space, while ensuring that the connection part has good sealing, carrying capacity and stability. The spherical joint can meet the rotation demand of the components in multiple directions due to its unique spherical structure design, and is widely used in various engineering applications.

[0003] However, the traditional spherical joint has the following disadvantages:

[0004] 1. The traditional spherical joint adopts a single ball core structure, and the ball core and the ball shell directly contact and slide relative to each other. In the long-term use process, due to the large resistance generated by sliding friction, the wear of the ball core and the ball shell will be aggravated.

[0005] 2. The traditional spherical joint is prone to ball core deviation and tilting when subjected to eccentric load or complex external force. This is because the single ball core cannot effectively disperse the load, resulting in local stress concentration. INVENTION CONTENTS

[0006] The utility model aims at solving the above-mentioned problem, and provides a multi-ball core spherical joint.

[0007] In order to achieve the above-mentioned purpose, the following technical scheme is adopted:

[0008] The multi-ball core spherical joint comprises a ball shell, a ball core and a sealing structure, the top end of the ball shell is provided with a compression flange, the inner wall of the ball shell is provided with a groove, the ball core comprises a main ball core and a plurality of supporting ball cores, the main ball core is arranged inside the ball shell, the supporting ball cores are embedded in the grooves of the inner wall of the ball shell and in contact with the main ball core, and the sealing structure is arranged in the inner wall of the ball shell and in close contact with the main ball core.

[0009] Preferably, the groove is a spherical groove, the depth and number of the groove are matched with the supporting ball core, and a limiting groove is arranged in the groove.

[0010] Preferably, a sealing cover is arranged in the groove, the center of the sealing cover is provided with a notch, the sealing cover is in close contact with the supporting ball core, a limiting protrusion is arranged on the edge of the sealing cover, and the limiting protrusion is matched with the limiting groove.

[0011] Preferably, the supporting ball cores are uniformly distributed along the surface of the main ball core, the ball core is exposed from the notch in the center of the sealing cover and in contact with the main ball core.

[0012] Preferably, the sealing structure comprises a metal framework and an elastic sealing layer, and the metal framework is arranged inside the elastic sealing layer.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] Through the contact of the plurality of supporting ball cores with the main ball core, the rolling friction is used to replace the sliding friction of the traditional single ball core, the friction coefficient is significantly reduced, the wear speed is significantly slowed down, and the service life is improved.

[0015] The main ball core is supported by the plurality of supporting ball cores, the load is dispersed in a plurality of contact points, the local stress of the main ball core is reduced, the eccentric load resistance is enhanced, and the ball core is prevented from being deviated or inclined.

[0016] The supporting ball core in the groove is isolated by the sealing cover, dust and impurities are prevented from entering the groove, additional wear of the supporting ball core is avoided, the service life is improved, the limiting protrusions are arranged on the outer edge of the sealing cover, the sealing cover is prevented from moving to the outside of the groove, and it is ensured that the supporting ball core is always aligned with the contact area of the main ball core. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a cross-sectional structure schematic diagram of a multi-ball core spherical joint of the utility model embodiment 1;

[0018] Figure 2 FIG. 1 is a cross-sectional structure schematic diagram of a multi-ball core spherical joint of the utility model embodiment 1;

[0019] Figure 3 FIG. 1 is a cross-sectional structure schematic diagram of a multi-ball core spherical joint of the utility model embodiment 1;

[0020] Figure 4 FIG. 1 is a cross-sectional structure schematic diagram of a multi-ball core spherical joint of the utility model embodiment 1;

[0021] Figure 5 FIG. 1 is a cross-sectional structure schematic diagram of a multi-ball core spherical joint of the utility model embodiment 1; DETAILED DESCRIPTION

[0022] Hereinafter, the multi-ball core spherical joint of the utility model will be specifically described with reference to the drawings.

[0023] As Figure 1As shown, the multi-ball core spherical joint comprises a spherical shell 1, a ball core 2, and a sealing structure 3. The spherical shell 1 is provided with a pressing flange 11 at the top end, which is used to fix the ball core 2 and provide an axial sealing force to ensure the tightness of the overall connection of the joint. The inner wall of the spherical shell 1 is provided with a groove 12. The ball core 2 comprises a main ball core 21 and a plurality of support ball cores 22. The main ball core 21 is arranged inside the spherical shell 1, and the support ball cores 22 are embedded in the groove 12 of the inner wall of the spherical shell 1 and are in contact with the main ball core 21. The sealing structure 3 is arranged in the inner wall of the spherical shell 1 and is in close contact with the main ball core 21. By contacting the main ball core 21 with the plurality of support ball cores 22, the surface concentrated stress of the main ball core 21 is dispersed, and the original sliding friction is changed into rolling friction, thereby reducing the friction coefficient and reducing the wear of the main ball core 21. During use, the main ball core 21 is supported by the plurality of support ball cores 22, and when the main ball core 21 rotates, the support ball cores 22 are driven to rotate independently, thereby achieving angle adjustment of the pipeline.

[0024] As shown in Figure 2 , the groove 12 is a spherical groove, and the depth and number of the groove 12 are accurately matched with the spherical profile of the support ball core 22. The groove 12 is provided with a limiting groove 13. The shape, size, and number of the groove 12 are accurately matched with the spherical profile of the support ball core 22, which ensures that the support ball core 22 is stably embedded and can rotate independently around its own center, forming rolling friction, and supporting the support ball core 22, thereby uniformly dispersing the load of the main ball core 21 to the spherical shell 1.

[0025] As shown in Figure 2 , Figure 3 , Figure 5 , the groove 12 is provided with a sealing cover 14. The center of the sealing cover 14 is provided with a notch 15. The sealing cover 14 is in close contact with the support ball core 22. The edge of the sealing cover 14 is provided with a limiting protrusion 16, which is matched with the limiting groove 13. The notch 15 in the center of the sealing cover 14 ensures the sealing of the support ball core 22, and at the same time, a part of the support ball core 22 is exposed and in contact with the main ball core 21, thereby improving the eccentric load resistance of the joint. The limiting protrusion 16 is inserted into the limiting groove 13 to prevent the sealing cover 14 from falling off and affecting the main ball core 21.

[0026] As shown in Figure 3 , Figure 4 , the support ball cores 22 are uniformly distributed along the surface of the main ball core 21. The support ball cores 22 are exposed from the notch 15 in the center of the sealing cover 14 and are in contact with the main ball core 21. While ensuring effective contact and avoiding motion interference, the support ball cores 22 are circumferentially distributed to form a three-dimensional flexible support network for the main ball core 21.

[0027] As shown in Figure 5As shown, the sealing structure 3 comprises a metal framework 31 and an elastic sealing layer 32, the metal framework 31 is arranged inside the elastic sealing layer 32. The metal framework 31 provides rigid support for the sealing structure 3, preventing the elastic sealing layer 32 from deforming due to stress and causing sealing failure.

[0028] In this embodiment, when the main ball core 21 is subjected to external force and rotates, the support ball core 22 rolls in the spherical groove 12, replacing the traditional sliding friction with rolling friction, which significantly reduces the frictional resistance. At the same time, the eight support ball cores 22 are evenly distributed, dispersing the load on the main ball core 21 to multiple contact points, effectively reducing the stress on a single contact point. The sealing structure 3 ensures close contact with the main ball core 21 through the pre-tightening force of the elastic sealing layer 32 and the support of the metal framework 31, preventing medium leakage. The limiting structure prevents the support ball core 22 from coming out of the spherical groove 12 through the cooperation of the limiting groove 13 and the limiting protrusion 16, ensuring the stability and reliability of the joint.

[0029] The above is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have other optimization schemes and additional functions. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A multi-ball core spherical joint, comprising a ball shell (1), a ball core (2), and a sealing structure (3), characterized in that: The top of the spherical shell (1) is provided with a clamping flange (11), and the inner wall of the spherical shell (1) is provided with a groove (12). The spherical core (2) includes a main spherical core (21) and several supporting spherical cores (22). The main spherical core (21) is located inside the spherical shell (1), and the supporting spherical cores (22) are embedded in the groove (12) of the inner wall of the spherical shell (1) and in contact with the main spherical core (21). The sealing structure (3) is located in the inner wall of the spherical shell (1) and is in close contact with the main spherical core (21).

2. The multi-core spherical joint as described in claim 1, characterized in that: The groove (12) is a spherical groove, and the depth and number of the groove (12) are matched with the supporting ball core (22). The groove (12) is provided with a limiting groove (13).

3. The multi-core ball joint as described in claim 2, characterized in that: A sealing cover (14) is provided in the groove (12). A notch (15) is provided in the center of the sealing cover (14). The sealing cover (14) is in close contact with the support ball core (22). A limiting protrusion (16) is provided on the edge of the sealing cover (14). The limiting protrusion (16) matches the limiting groove (13).

4. The multi-core spherical joint as described in claim 3, characterized in that: The supporting ball core (22) is evenly distributed along the surface of the main ball core (21). The supporting ball core (22) is exposed from the notch (15) in the center of the sealing cover (14) and contacts the main ball core (21).

5. The multi-core ball joint as described in claim 1, characterized in that: The sealing structure (3) includes a metal frame (31) and an elastic sealing layer (32), wherein the metal frame (31) is disposed inside the elastic sealing layer (32).

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