A coaxial rotary joint

Abstract

The utility model discloses a coaxial heart swivel joint, wherein, including: the inside installation of first joint has rotary inner tube, the inside installation of second joint has and connects the inner tube, one end of rotary inner tube outward extends and is equipped with the first communicating pipe of inclined setting, the inner wall of second joint still is equipped with the second communicating pipe of inclined setting with connecting the inner tube, first joint rotates and is installed in second joint, just first communicating pipe enters the inside of second joint and is installed in second communicating pipe, with first communicating pipe and second communicating pipe with connecting the inner tube fluid communication of rotary inner tube is made to when the outer circumferential surface of first joint and the outer circumferential surface of second joint are coplanar, the axis of rotary inner tube and the axis of connecting inner tube are on the same straight line. The device modular design, is convenient for maintaining, and the maintenance and replacement of product become more convenient, reduce long -term use cost.

Description

Technical Field

[0001] This utility model relates to the field of fluid transport technology, and in particular to a coaxial rotary joint. Background Technology

[0002] Rotary joints, especially coaxial rotary joints used for fluid (such as liquids and gases) transport, are indispensable key components in modern industrial equipment. They are widely used in automated machinery, semiconductor manufacturing, medical devices, packaging and printing, and other fields. Their core function is to establish a continuous and reliable fluid channel between two parts that need to rotate relative to each other, while preventing fluid leakage.

[0003] Currently, most coaxial rotary joints on the market employ hard-seal mechanical structures. For example, sealing is achieved through direct contact between precision-machined metal end faces, or by utilizing complex labyrinth seal structures. However, these existing technologies generally suffer from high manufacturing costs, complex processing, reliance on interference fits for reliable sealing, and difficulties in assembly and maintenance. Utility Model Content

[0004] In view of this, and to solve the above problems, the purpose of this utility model is to provide a coaxial rotary joint, comprising: First connector, second connector; The first connector has a rotating inner tube installed inside, and the second connector has a connecting inner tube installed inside. One end of the rotating inner tube extends outward and is provided with an inclined first connecting tube, and the inner wall of the second joint is also provided with a second connecting tube that is inclined relative to the connecting inner tube. The first connector is rotatably mounted on the second connector, and the first connecting pipe extends into the interior of the second connector and is mounted on the second connecting pipe, so that the rotating inner pipe is in fluid communication with the connecting inner pipe via the first connecting pipe and the second connecting pipe; When the outer circumferential surface of the first connector and the outer circumferential surface of the second connector are coplanar, the axis of the rotating inner tube and the axis of the connecting inner tube are on the same straight line.

[0005] In the aforementioned coaxial rotary joint, a steel ball positioning structure is provided on the end face of the second joint facing the first joint, and a plurality of positioning grooves are provided on the end face of the first joint facing the second joint; the steel ball positioning structure includes a steel ball, which can be inserted into any of the positioning grooves to achieve circumferential positioning of the first joint and the second joint.

[0006] In the aforementioned coaxial rotary joint, the steel ball positioning structure further includes an elastic element. The second joint has a mounting groove on its end face facing the first joint. One end of the elastic element extends into the mounting groove and connects to the bottom of the mounting groove. The steel ball extends into the mounting groove and connects to the other end of the elastic element.

[0007] In the aforementioned coaxial rotary joint, a plurality of the mounting slots are arranged around the first connecting pipe array.

[0008] In the aforementioned coaxial rotary joint, the end face of the first joint facing the second joint and the end face of the second joint facing the first joint are both inclined surfaces.

[0009] In the aforementioned coaxial rotary joint, the first joint and the second joint are made of plastic material, while the rotating inner tube, the first connecting tube, the second connecting tube, and the connecting inner tube are all made of metal material.

[0010] In the aforementioned coaxial rotary joint, a sealing ring is provided between the first connecting pipe and the second joint.

[0011] The positive effects of the above technical solution compared with the existing technology are: 1. Unique connecting pipe design for high reliability: The inclined first and second connecting pipes work together to maintain stable fluid flow even during joint rotation.

[0012] 2. Optimized material combination, balancing cost and performance: The first and second joints are made of plastic materials, which effectively reduces weight and manufacturing costs; the rotating inner tube, the first connecting tube, the second connecting tube and the connecting inner tube are made of metal materials, which ensures pressure resistance, wear resistance and media compatibility, achieving the best balance between cost and performance.

[0013] 3. Integrated indexing and positioning with a compact structure: The indexing and positioning function is integrated with the rotary joint body through the built-in steel ball positioning structure. No additional positioning device is required, which significantly simplifies the system structure and reduces assembly complexity and failure rate.

[0014] 4. Modular design for easy maintenance: The structure of each component is clear, especially the use of separate first and second connectors, and replaceable internal pipes and seals, which makes product maintenance and replacement more convenient and reduces long-term use costs. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of a coaxial rotary joint according to the present invention.

[0016] Figure 2This is an exploded view of a coaxial rotary joint according to the present invention.

[0017] Figure 3 This is a cross-sectional view of another state of a coaxial rotary joint according to this utility model.

[0018] Figure 4 This is a schematic diagram of a coaxial rotary joint according to the present invention.

[0019] 1. First connector; 2. Second connector; 3. Rotating inner tube; 4. Connecting inner tube; 5. First connecting tube; 6. Second connecting tube; 7. Steel ball; 8. Positioning groove; 9. Elastic element; 10. Sealing ring; 11. Mounting groove. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0021] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0022] like Figures 1 to 4 As shown, a preferred embodiment of a coaxial rotary joint is illustrated, comprising: a first joint 1 and a second joint 2.

[0023] The first connector 1 has a rotating inner tube 3 installed inside, and the second connector 2 has a connecting inner tube 4 installed inside. One end of the rotating inner tube 3 extends outward with an inclined first connecting tube 5. The inner wall of the second connector 2 also has a second connecting tube inclined relative to the connecting inner tube 4. The first connector 1 is rotatably installed on the second connector 2, and the first connecting tube 5 extends into the interior of the second connector 2 and is installed on the second connecting tube 6, so that the rotating inner tube 3 is in fluid communication with the connecting inner tube 4 through the first connecting tube 5 and the second connecting tube 6. When the outer circumferential surface of the first connector 1 and the outer circumferential surface of the second connector 2 are coplanar, the axis of the rotating inner tube 3 and the axis of the connecting inner tube 4 are on the same straight line.

[0024] In practical use, the first connecting pipe 5 is inclined relative to the rotating inner pipe 3, and the second connecting pipe 6 is inclined relative to the connecting inner pipe 4. When the first connecting pipe 5 extends into the interior of the second connector 2 and is fixed to the second connecting pipe 6, fluid can flow from the rotating inner pipe 3, through the first connecting pipe 5 and the second connecting pipe 6, and finally into the connecting inner pipe 4, forming a complete, rotatable fluid passage. When the first connector 1 is rotated so that its outer circumferential surface smoothly transitions with the outer circumferential surface of the second connector 2, forming a continuous coplanar surface, the axis of the rotating inner pipe 3 and the axis of the connecting inner pipe 4 are exactly on the same straight line, achieving perfect coaxial alignment.

[0025] Based on the above, this utility model also has the following embodiments: Furthermore, a coaxial rotary joint is provided, wherein a steel ball positioning structure is provided on the end face of the second joint 2 facing the first joint 1, and a plurality of positioning grooves 8 are provided on the end face of the first joint 1 facing the second joint 2; the steel ball positioning structure includes a steel ball 7, which can be inserted into any positioning groove 8 to achieve circumferential positioning of the first joint 1 and the second joint 2.

[0026] Furthermore, in a coaxial rotary joint, the steel ball positioning structure further includes an elastic element 9. A mounting groove 11 is provided on the end face of the second joint 2 facing the first joint 1. One end of the elastic element 9 extends into the mounting groove 11 and connects to the bottom of the groove 11. The steel ball 7 extends into the mounting groove 11 and connects to the other end of the elastic element 9. One end of the elastic element 9 abuts against the bottom of the mounting groove 11, and the other end abuts against the steel ball 7, providing a continuous elastic thrust to the steel ball 7.

[0027] Specifically, during operation, when the first connector 1 is rotated, the steel ball 7 will slide on the end face of the first connector 1. When the steel ball 7 slides into any positioning groove 8, the operator will feel a clear jolt, and at the same time, the steel ball 7 is locked in that position under the action of the elastic element 9, thus achieving precise circumferential positioning of the first connector 1 and the second connector 2.

[0028] Furthermore, a coaxial rotary joint is provided, wherein a plurality of mounting slots 8 are arranged in an array around a first connecting pipe 5.

[0029] Furthermore, a coaxial rotary joint is provided, wherein the end face of the first joint 1 facing the second joint 2, and the end face of the second joint 2 facing the first joint 1, are both inclined surfaces. The opposing end faces of the first joint 1 and the second joint 2 are both inclined surfaces. This design allows the steel ball 7 to smoothly ascend and descend along the inclined surfaces during rotation, generating a gradual axial force, which helps the steel ball 7 to more smoothly engage in the positioning groove 8 and provides a better positioning feel.

[0030] Furthermore, in a coaxial rotary joint, the first connector 1 and the second connector 2 are made of plastic materials, while the rotating inner tube 4, the first connecting tube 5, the second connecting tube 6, and the connecting inner tube 4 are all made of metal materials. Specifically, the first connector 1 and the second connector 2 can be injection molded from high-strength engineering plastics such as POM and PEEK to reduce cost and weight. The rotating inner tube 3, the first connecting tube 5, the second connecting tube 6, and the connecting inner tube 4 can be made of metal materials such as stainless steel and brass to ensure the pressure resistance, wear resistance, and corrosion resistance of the fluid channels.

[0031] Furthermore, a coaxial rotary joint is provided, wherein a sealing ring is provided between the first connecting pipe 5 and the second connector 2. This prevents fluid leakage from the mating gap between the first connecting pipe 5 and the second connector 2, ensuring the sealing reliability of the rotary joint.

[0032] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A coaxial rotary joint, characterized in that, include: First connector, second connector; The first connector has a rotating inner tube installed inside, and the second connector has a connecting inner tube installed inside. One end of the rotating inner tube extends outward and is provided with an inclined first connecting tube, and the inner wall of the second joint is also provided with a second connecting tube that is inclined relative to the connecting inner tube. The first connector is rotatably mounted on the second connector, and the first connecting pipe extends into the interior of the second connector and is mounted on the second connecting pipe, so that the rotating inner pipe is in fluid communication with the connecting inner pipe via the first connecting pipe and the second connecting pipe; When the outer circumferential surface of the first connector and the outer circumferential surface of the second connector are coplanar, the axis of the rotating inner tube and the axis of the connecting inner tube are on the same straight line.

2. The coaxial rotary joint according to claim 1, characterized in that, The second connector has a steel ball positioning structure on its end face facing the first connector, and the first connector has a plurality of positioning grooves on its end face facing the second connector. The steel ball positioning structure includes a steel ball, which can be inserted into any of the positioning grooves to achieve circumferential positioning of the first connector and the second connector.

3. A coaxial rotary joint according to claim 2, characterized in that, The steel ball positioning structure also includes an elastic element. The end face of the second connector facing the first connector is provided with a mounting groove. One end of the elastic element extends into the mounting groove and connects to the bottom of the mounting groove. The steel ball extends into the mounting groove and connects to the other end of the elastic element.

4. A coaxial rotary joint according to claim 3, characterized in that, Several of the mounting slots are arranged around the first connecting pipe array.

5. A coaxial rotary joint according to claim 1, characterized in that, The end face of the first connector facing the second connector, and the end face of the second connector facing the first connector, are both inclined surfaces.

6. A coaxial rotary joint according to claim 1, characterized in that, The first connector and the second connector are made of plastic material, while the rotating inner tube, the first connecting tube, the second connecting tube and the connecting inner tube are all made of metal material.

7. A coaxial rotary joint according to claim 1, characterized in that, A sealing ring is provided between the first connecting pipe and the second connector.

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