A flexible joint

Abstract

The utility model discloses a flexible joint, including part one, part two, half ball seat and spherical joint, part one is inserted in part two, and spherical joint is installed in the cavity that part one and part two constitute, and part two includes main part and connector, and the outer circle surface of part one is sealed with the inner circle surface of main part, and the connector is connected with part one through fastener, and half ball seat is connected in part one, and half ball seat upper end is equipped with half ball groove, and the outlet of main part upper end is equipped with taper face, and the first annular groove that is equipped with respectively in taper face and half ball groove is equipped with first sealing washer in first annular groove, and first sealing washer is built -in with metal spring ring, and the outer circle surface of part one is equipped with the second annular groove that the section is big inside and small outside, and second sealing washer is embedded in second annular groove, and second sealing washer and second annular groove section shape are equivalent. The utility model discloses sealing washer installation stable and reliable, and it is difficult to damage, and the service life is longer, and effectively guarantee the good sealing performance between parts.

Description

Technical Field

[0001] This utility model relates to the field of connection device technology, and in particular to a flexible joint for quick connection. Background Technology

[0002] Currently, flange connections are often used to achieve quick connection and sealing between two parts. This does not allow for installation with any misalignment between the two parts, which makes installation and alignment difficult, resulting in a large installation space, slow connection speed, and low production efficiency. In addition, the need to tighten bolts and nuts during flange connection increases labor intensity.

[0003] To address the aforementioned issues, utility model patent application CN201621124763.8 discloses an improved flexible quick-connect joint, comprising a first part, a second part, a hemispherical seat, and a spherical connector. The second part is inserted into the first part, and the spherical connector is housed within the cavity formed by the first and second parts. The upper spherical surface of the spherical connector is sealed to the upper inner circular surface of the second part, and the lower spherical surface of the spherical connector is sealed to the inner circular surface of the hemispherical seat. The outer circular surface of the hemispherical seat is threaded to the upper inner circular surface of the first part, and the outer circular surface of the first part is sealed to the inner circular surface of the second part. This design can replace flange connections, achieving quick connection and sealing between the two parts. The spherical connector can rotate at a certain angle, allowing installation even with some misalignment between the two components, reducing installation difficulty, lowering costs, and improving production efficiency.

[0004] Among them, the upper spherical surface of the ball joint and the upper inner spherical surface of part two, and the lower spherical surface of the ball joint and the inner circular surface of the hemispherical seat are sealed by O-rings. Since the O-rings are installed on the spherical surface, when the ball joint rotates, the O-rings are easily squeezed into the sealing gap and damaged. The outer circular surface of part one and the inner circular surface of part two are also sealed by an O-ring. When parts one and two are installed, the O-ring will be damaged by rotating around the center of the cross section.

[0005] Because the current flexible joint structure has poor reliability, it is necessary to improve it to address the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a flexible joint. The sealing ring of this invention is stable and reliable to install, not easily damaged, has a longer service life, and can effectively ensure good sealing performance between components.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a flexible joint, comprising a first part, a second part, a hemispherical seat, and a spherical joint. The first part is inserted into the second part, and the spherical joint is movably installed in the cavity formed by the first and second parts. The second part includes a main body and a connector rotatably disposed on the main body. The outer circular surface of the first part is sealed to the inner circular surface of the main body, and the connector is locked to the first part by at least one fastener. The hemispherical seat is threaded into the first part. The upper end of the hemispherical seat is provided with a hemispherical groove adapted to the shape of the spherical joint. The upper outlet of the main body is provided with a conical surface adapted to the shape of the spherical joint. A first annular groove is provided on the conical surface and the hemispherical groove, respectively. A first sealing ring for sealing with the connector is embedded in the first annular groove, and a metal spring ring is built into the first sealing ring. A second annular groove with a cross-section larger on the inside and smaller on the outside is provided on the outer circular surface of the first part. A second sealing ring for sealing with the inner circular surface of the main body is embedded in the second annular groove, and the cross-sectional shape of the second sealing ring is equivalent to the cross-sectional shape of the second annular groove.

[0008] By adopting the above technical solution, firstly, a first sealing ring with a built-in metal spring ring is set on the conical surface and hemispherical groove to seal the spherical joint. Due to the structure of the first sealing ring combined with the metal spring ring, it has both good rigidity and elasticity, not only with better anti-extrusion ability, but also with the metal spring ring providing a constant preload force for the first sealing ring, resulting in a better sealing effect. Secondly, a second sealing ring with a cross-section that is larger on the inside and smaller on the outside, and a second annular groove on the outer circular surface of part one that matches the shape of the second sealing ring are used to fix the second sealing ring. This achieves a seal between part one and the main body. Due to the non-circular cross-section design of the second sealing ring, the second sealing ring will not rotate around the center of the cross-section and be damaged when part one and part two are installed, making the installation more stable and reliable, and ensuring good sealing between part one and part two.

[0009] The present invention is further configured such that there are two metal spring coils, which are symmetrically arranged near the upper and lower ends of the metal spring coils.

[0010] By adopting the above technical solution, the bimetallic spring ring provides constant radial pressure to the second sealing ring through synergistic action, ensuring that the sealing surface fits tightly against the surface of the spherical joint, preventing media leakage, and making the seal more reliable.

[0011] The present invention is further configured such that an annular protrusion is provided on the inner circle of the first sealing ring, and the protrusion direction of the annular protrusion is directed toward the center of the spherical joint.

[0012] By adopting the above technical solution, higher contact pressure is formed through localized stress concentration, which further improves the sealing performance between the first sealing ring and the ball joint.

[0013] The present invention is further configured such that the cross-sections of the second sealing ring and the second annular groove are both isosceles trapezoidal.

[0014] By adopting the above technical solution, the specific structure of the second sealing ring and the second annular groove is such that the limiting structure is subjected to uniform force, which plays a role in preventing overturning.

[0015] The present invention is further provided that the lower end of the hemispherical seat has a tool groove with a polygonal cross-section.

[0016] By adopting the above technical solution, the tool slot can be set to a regular hexagonal shape, and the hemispherical seat can be rotated by using a hexagonal wrench to tighten or loosen the spherical joint, making disassembly and assembly operations more convenient.

[0017] The present invention is further configured such that the hemispherical seat includes an operating ring and a sealing seat, the operating ring is threadedly connected to the inner part, the sealing seat is disposed on the upper end of the operating ring, the hemispherical groove is disposed on the sealing seat, the upper end of the operating ring is coaxially provided with a positioning protrusion with a circular cross-section, and the sealing seat is provided with a positioning hole adapted to the positioning protrusion.

[0018] By adopting the above technical solution, the hemispherical seat adopts a separate structure of operating ring and sealing seat. The sealing seat and operating ring rotate and cooperate. When the operating ring is rotated, when the sealing seat abuts against the spherical joint, the sealing seat no longer rotates with the operating ring, thereby greatly reducing the torsional force on the first sealing ring during installation and achieving a better protection effect for the first sealing ring.

[0019] The present invention is further configured such that the upper end of the operating ring is provided with a first guide groove with a semi-circular cross-section, and the lower end of the sealing seat is provided with a second guide groove with a semi-circular cross-section. The first guide groove and the second guide groove are combined to form a first annular cavity, and a plurality of first balls are rolled in the first annular cavity.

[0020] By adopting the above technical solution, the friction between the operating ring and the sealing seat during relative rotation is greatly reduced, thereby significantly reducing the rotational force transmitted to the sealing seat when the operating ring rotates.

[0021] The present invention is further configured such that a third guide groove with a semi-circular cross-section is provided on the outer circular surface of the connector, and a fourth guide groove with a semi-circular cross-section is provided on the inner circular surface of the main body. The third guide groove and the fourth guide groove are combined to form a second annular cavity with a circular cross-section. Multiple second balls are rolled in the second annular cavity. The main body is also provided with at least one through hole for the second balls to roll into the second annular cavity. A concave screw is threaded to the outer end of the through hole.

[0022] By adopting the above technical solution, the connection between the body and the connector can be realized, and it can rotate smoothly around the axis at will. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the first state structure of the entire utility model; Figure 2 This is a schematic diagram of the structure of the first sealing ring of this utility model; Figure 3 This is a schematic diagram of the structure of the second sealing ring of this utility model; Figure 4 This is a schematic diagram of the second state structure of the entire utility model; Figure 5 This is a schematic diagram of the structure of the hemispherical seat of this utility model; Figure 6 This is an exploded view of the hemispherical base of this utility model.

[0024] In the diagram: 1. Part 1; 2. Part 2; 3. Hemispherical seat; 4. Spherical joint; 5. Main body; 6. Connector; 7. Fastener; 8. Conical surface; 9. First annular groove; 10. First sealing ring; 11. Metal spring ring; 12. Second annular groove; 13. Second sealing ring; 14. Annular protrusion; 15. Tool groove; 16. Operating ring; 17. Sealing seat; 18. Positioning protrusion; 19. Positioning hole; 20. First guide groove; 21. Second guide groove; 22. First annular chamber; 23. First ball; 24. Third guide groove; 25. Fourth guide groove; 26. Second annular chamber; 27. Second ball; 28. Through hole; 29. ​​Countersunk screw; 30. Hemispherical groove. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example: As attached Figures 1-6The diagram illustrates a flexible joint comprising a component 1, a component 2, a hemispherical seat 3, and a spherical connector 4. Component 1 is inserted into component 2. The spherical connector 4 is movably mounted within the cavity formed by components 1 and 2. Component 2 includes a body 5 and a connector 6 rotatably mounted on the body 5. The outer surface of component 1 is sealed to the inner surface of the body 5. The connector 6 is locked to component 1 by at least one fastener 7 (which can be a screw, screwed in radially for locking). The hemispherical seat 3 is threaded into component 1; that is, the outer surface of the hemispherical seat 3 has an external thread, and the inner surface of component 1 has an internal thread adapted to this external thread. The upper end of the hemispherical seat 3 is provided with a connector for the spherical connector. 4. A hemispherical groove 30 with a matching shape is provided at the upper outlet of the main body 5, and a conical surface 8 with a matching shape of the spherical joint 4 is provided on the conical surface 8 and the hemispherical groove 30 respectively. A first annular groove 9 is provided in the first annular groove 9 for forming a sealing fit with the connector 6. The first sealing ring 10 has a metal spring ring 11 inside. The two are made by metal-plastic composite processing, such as insert molding and secondary vulcanization. A second annular groove 12 with a cross-section that is larger on the inside and smaller on the outside is provided on the outer circular surface of the part 1. A second sealing ring 13 for forming a sealing fit with the inner circular surface of the main body 5 is provided in the second annular groove 12. The cross-sectional shape of the second sealing ring 13 is similar to that of the cross-sectional shape of the second annular groove 12. First, the spherical joint 4 is sealed by a first sealing ring 10 with a built-in metal spring ring 11 on the conical surface 8 and the hemispherical groove 30. Due to the structure of the first sealing ring 10 combined with the metal spring ring 11, it has both good rigidity and elasticity, which not only has better anti-extrusion ability, but also the metal spring ring 11 provides a constant preload for the first sealing ring 10, resulting in a better sealing effect. Second, a second sealing ring 13 with a cross-section that is larger on the inside and smaller on the outside, and a second annular groove 12 that matches the shape of the second sealing ring 13 are provided on the outer circular surface of part 1 to fix the second sealing ring 13. This achieves a seal between part 1 and the main body 5. Due to the non-circular cross-section design of the second sealing ring 13, the second sealing ring 13 will not be damaged by rotating around the center of the cross-section when part 1 and part 2 are installed, making the installation more stable and reliable and ensuring good sealing between part 1 and part 2.

[0027] As attached Figure 2 As shown, there are two bimetallic spring rings 11, symmetrically arranged near their upper and lower ends. The bimetallic spring rings 11 work together to provide a constant radial pressure to the second sealing ring 13, ensuring a tight seal between the sealing surface and the spherical joint 4 surface, preventing media leakage and making the seal more reliable.

[0028] As attached Figure 2As shown, the inner circle of the first sealing ring 10 is provided with an annular protrusion 14, and the protrusion direction of the annular protrusion 14 is set towards the center of the ball joint 4, that is, the orientation of the annular protrusion 14 is perpendicular to the tangential direction of the contact point of the ball joint 4. By locally concentrating stress, a higher contact pressure is formed, which further improves the sealing performance between the first sealing ring 10 and the ball joint 4.

[0029] As attached Figure 3 As shown, the cross-sections of the second sealing ring 13 and the second annular groove 12 are both isosceles trapezoidal. This is the specific structure of the second sealing ring 13 and the second annular groove 12. The limiting structure is subjected to uniform force, which plays a role in preventing overturning.

[0030] As attached Figure 1 and attached Figure 5 As shown, the lower end of the hemispherical seat 3 has a tool groove 15 with a polygonal cross-section. The tool groove 15 can be set to a regular hexagonal shape. The hemispherical seat 3 can be rotated by a hexagonal wrench to tighten or loosen the spherical joint 4, making disassembly and assembly operations more convenient.

[0031] As attached Figures 4-6 As shown, more specifically, the hemispherical seat 3 can be designed as a split structure, that is, the hemispherical seat 3 includes an operating ring 16 and a sealing seat 17. The operating ring 16 is threadedly connected to the inner part 1, that is, the outer circular surface of the operating ring 16 has an external thread, and the inner circular surface of the part 1 has an internal thread that matches the external thread. The sealing seat 17 is disposed on the upper end of the operating ring 16, and the hemispherical groove 30 is disposed on the sealing seat 17. The upper end of the operating ring 16 is coaxially provided with a positioning protrusion 18 with a circular cross-section. The sealing seat 17 is provided with a positioning hole 19 that matches the positioning protrusion 18, that is, the inner circular surface of the positioning hole 19 is in contact with the outer circular surface of the positioning protrusion 18. The hemispherical seat 3 adopts a split structure of operating ring 16 and sealing seat 17. The sealing seat 17 and operating ring 16 are rotatably engaged. When the operating ring 16 is rotated, when the sealing seat 17 abuts against the ball joint 4, the sealing seat 17 no longer rotates with the operating ring 16, thereby greatly reducing the torsional force on the first sealing ring 10 during installation and operation, and playing a better role in protecting the first sealing ring 10.

[0032] As attached Figure 4 As shown, the upper end of the operating ring 16 is provided with a first guide groove 20 with a semi-circular cross-section, and the lower end of the sealing seat 17 is provided with a second guide groove 21 with a semi-circular cross-section. The first guide groove 20 and the second guide groove 21 combine to form a first annular chamber 22, in which a plurality of first balls 23 are rolled. Based on the rotational engagement of the operating ring 16 and the sealing seat 17, the friction between the two during relative rotation is greatly reduced, thereby significantly reducing the rotational force transmitted to the sealing seat 17 when the operating ring 16 rotates.

[0033] As attached Figure 4 As shown, the outer circular surface of the connector 6 is provided with a third guide groove 24 with a semi-circular cross-section, and the inner circular surface of the main body 5 is provided with a fourth guide groove 25 with a semi-circular cross-section. The third guide groove 24 and the fourth guide groove 25 combine to form a second annular chamber 26 with a circular cross-section. A plurality of second balls 27 are rolled inside the second annular chamber 26. The main body 5 is also provided with at least one through hole 28 for the second balls 27 to roll into the second annular chamber 26. The outer end of the through hole 28 is threaded with a concave screw 29, that is, the outer end of the through hole 28 has an internal thread. This design can realize the connection between the main body and the connector 6, and can rotate smoothly around the axis at will.

Claims

1. A flexible joint, comprising a first part (1), a second part (2), a hemispherical seat (3), and a spherical connector (4), wherein the first part (1) is inserted into the second part (2), and the spherical connector (4) is movably installed in the cavity formed by the first part (1) and the second part (2), the second part (2) comprising a main body (5) and a connector (6) rotatably disposed on the main body (5), the outer circular surface of the first part (1) is sealed to the inner circular surface of the main body (5), and the connector (6) is locked to the first part (1) by at least one fastener (7), the hemispherical seat (3) is threaded into the first part (1), the upper end of the hemispherical seat (3) is provided with a hemispherical groove (30) adapted to the shape of the spherical connector (4), and the upper outlet of the main body (5) is provided with a conical surface (8) adapted to the shape of the spherical connector (4); characterized in that: The conical surface (8) and the hemispherical groove (30) are respectively provided with a first annular groove (9). A first sealing ring (10) for forming a sealing fit with the connector (6) is embedded in the first annular groove (9). A metal spring ring (11) is built into the first sealing ring (10). The outer circular surface of the part (1) is provided with a second annular groove (12) with a cross-section that is larger on the inside and smaller on the outside. A second sealing ring (13) for forming a sealing fit with the inner circular surface of the main body (5) is embedded in the second annular groove (12). The cross-sectional shape of the second sealing ring (13) is similar to that of the cross-sectional shape of the second annular groove (12).

2. The flexible joint according to claim 1, characterized in that: The number of metal spring coils (11) is two, and they are symmetrically arranged near the upper and lower ends of the metal spring coils (11).

3. A flexible joint according to claim 1, characterized in that: The inner circle of the first sealing ring (10) is provided with an annular protrusion (14), and the protrusion direction of the annular protrusion (14) is set towards the center of the ball joint (4).

4. A flexible joint according to claim 1, characterized in that: The cross-sections of the second sealing ring (13) and the second annular groove (12) are both isosceles trapezoidal.

5. A flexible joint according to claim 1, characterized in that: The lower end of the hemispherical seat (3) is provided with a tool groove (15) with a polygonal cross-section.

6. A flexible joint according to claim 1, characterized in that: The hemispherical seat (3) includes an operating ring (16) and a sealing seat (17). The operating ring (16) is threaded into part one (1). The sealing seat (17) is located on the upper end of the operating ring (16). The hemispherical groove (30) is located on the sealing seat (17). The upper end of the operating ring (16) is coaxially provided with a positioning protrusion (18) with a circular cross-section. The sealing seat (17) is provided with a positioning hole (19) that matches the positioning protrusion (18).

7. A flexible joint according to claim 6, characterized in that: The upper end of the operating ring (16) is provided with a first guide groove (20) with a semi-circular cross section, and the lower end of the sealing seat (17) is provided with a second guide groove (21) with a semi-circular cross section. The first guide groove (20) and the second guide groove (21) are combined to form a first annular chamber (22), and a plurality of first balls (23) are rolled inside the first annular chamber (22).

8. A flexible joint according to claim 1, characterized in that: The outer circular surface of the connector (6) is provided with a third guide groove (24) with a semi-circular cross-section, and the inner circular surface of the main body (5) is provided with a fourth guide groove (25) with a semi-circular cross-section. The third guide groove (24) and the fourth guide groove (25) are combined to form a second annular chamber (26) with a circular cross-section. Multiple second balls (27) are rolled in the second annular chamber (26). The main body (5) is also provided with at least one through hole (28) for the second balls (27) to roll into the second annular chamber (26). A concave screw (29) is threaded to the outer end of the through hole (28).

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