Hydraulic pipe joint capable of replacing welding process

Abstract

The utility model discloses a hydraulic pipe joint capable of replacing a welding process, which comprises a high-strength pipe section at the end part of a pipe fitting, a clamping ring is integrally formed in the middle of the excircle surface of the high-strength pipe section, and a joint body and a sleeve piece are respectively sleeved on the pipe body on two sides of the clamping ring; the part, arranged on the pipe body in a sleeving mode, of the connector body can be inserted into the sleeve piece, and the sleeve piece can form axial restraining force on the inserted part of the connector body, so that the connector body and the sleeve piece axially clamp the clamping ring. The portion, between the clamping ring and the connector body, of the pipe body is sleeved with an elastic ring, and the connector body, the clamping ring and the elastic ring are matched to form a rigid sealing structure and a flexible sealing structure. The hydraulic oil cylinder can be efficiently assembled and disassembled, and the working reliability of the hydraulic oil cylinder is ensured under the high-strength working condition.

Description

Technical Field

[0001] This utility model relates to the field of pipe fitting technology, and in particular to a hydraulic pipe fitting that can replace welding. Background Technology

[0002] The connection of oil pipes on hydraulic cylinders requires reliable sealing and connection strength, typically achieved through welding to ensure stable operation. However, welding is a relatively complex and labor-intensive process, resulting in low assembly efficiency and potential environmental pollution. Furthermore, since the sealing effect and connection strength depend entirely on the welding quality, consistency is poor, and weld defects are difficult to detect. This can lead to weld damage under high-intensity conditions due to pulling, vibration, and impact, compromising operational reliability. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a hydraulic pipe joint that can replace the welding process, which can be assembled and disassembled efficiently, and ensure the reliability of hydraulic cylinder operation under high-intensity working conditions.

[0004] Technical solution: To achieve the above objectives, this utility model provides a hydraulic pipe fitting that can replace welding, comprising a high-strength pipe section at the end of the pipe fitting, wherein a retaining ring is integrally formed in the middle of the outer circumference of the high-strength pipe section, and a fitting body and a kit are respectively fitted on the pipe body on both sides of the retaining ring. The portion of the fitting body fitted on the pipe body can be inserted into the kit, and the kit can form an axial constraint force on the inserted portion of the fitting body, so that the fitting body and the kit axially clamp the retaining ring.

[0005] An elastic ring is fitted onto the tube between the retaining ring and the connector body. The connector body, retaining ring, and elastic ring work together to form a rigid sealing structure and a flexible sealing structure.

[0006] Furthermore, the connector body is fitted onto the port of the pipe fitting, and the kit is fitted onto the pipe body on the side of the retaining ring away from the port. The contact surface between the retaining ring and the kit is an outward-facing conical surface.

[0007] Furthermore, the contact surface between the retaining ring and the connector body is a disc surface perpendicular to the axial direction, and the fitting hole port of the connector body is provided with an inwardly facing conical chamfer, which can radially press the elastic ring on the outer circular surface of the pipe and axially press the elastic ring on the disc surface.

[0008] Furthermore, the retaining ring is formed by expanding the end of the pipe fitting, thereby forming a high-strength pipe section at the end of the pipe fitting; an annular V-shaped groove is formed on the inner wall of the pipe fitting at the radially corresponding position of the retaining ring, thereby forming a dense structure around the bottom of the groove on the pipe wall, and the dense structure is located at the interface between the pipe fitting and the retaining ring.

[0009] Furthermore, an annular groove is formed on the disc surface close to the tube surface, and the elastic ring can be deformed by the chamfer of the conical surface and fill the annular groove to form a flexible sealing structure.

[0010] Furthermore, the elastic ring is compressed such that its thickness decreases from the side closer to the retaining ring to the side closer to the connector body.

[0011] Furthermore, the outer ring of the disc surface is formed with a stepped surface structure, and the stepped surface structure is adapted to fit the end of the connector body to form a rigid sealing structure.

[0012] Furthermore, the connector body and the kit are fitted together by a threaded structure.

[0013] Beneficial Effects: This utility model provides a hydraulic pipe joint that can replace welding. The pipe end structure is formed in one second, effectively improving production efficiency and facilitating assembly. Compared to welding, the parts are standardized, the sealing performance is consistent and reliable, and it can be repeatedly disassembled and reassembled without loss of sealing performance. Through structural design, assembly errors are easier to control and are easier to detect than weld defects. Furthermore, after assembly, only a single leakage path is formed, along which a rigid sealing structure is created. The integrally expanded retaining ring at the pipe end, combined with the joint body and kit, forms a reliable connection structure, improving the joint's pull-out resistance and preventing gaps in the rigid sealing structure that could lead to seal failure. Under vibration and impact, the elastic ring reduces the impact and friction between the mating surfaces of the rigid sealing structure, preventing wear-induced gap increases and seal failure. Additionally, the elastic ring forms a flexible sealing structure on the front side of the rigid sealing structure, creating a redundant double-seal structure along the single leakage path, ensuring reliable sealing performance under high-intensity conditions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of one embodiment of the hydraulic pipe connector of this utility model;

[0015] Figure 2 This is a schematic diagram showing the structure of the retaining ring and elastic ring, and their fit with the pipe body and connector body. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] As attached Figure 1-2The hydraulic pipe fitting, which can replace welding, includes a high-strength pipe section formed at the end of a pipe fitting 1. A retaining ring 2 is integrally formed on the outer circumference of the high-strength pipe section at its axial center. A fitting body 3 and a sleeve 4 are respectively fitted onto the pipe body on both sides of the retaining ring 2. The portion of the fitting body 3 fitted onto the pipe body can be inserted into the sleeve 4, and the sleeve 4 can form an axial constraint force on the inserted portion of the fitting body 3, so that the fitting body 3 and the sleeve 4 axially clamp the retaining ring 2. The fitting body and the sleeve are typically machined from forgings, and their inherent strength and the fit between them are considered important factors. The strength of the fitting is higher than that of the pipe fitting. Under high-intensity working conditions, the pipe fitting itself is more susceptible to damage, which can lead to gaps. This solution enhances the radial connection strength with the pipe fitting 1 through the integrally formed retaining ring 2, and its axial tensile strength and clamping strength are also higher. This enhances the overall strength of the pipe end used for connection. When the pipe fitting is subjected to tensile force, impact force and vibration, the mating parts of the pipe fitting, connector body 3 and kit 4 can maintain a relatively stable and reliable structure, avoiding the increase of mating gap caused by wear, breakage, extrusion deformation and other reasons, thereby ensuring a reliable sealing effect.

[0018] An elastic ring 7 is fitted on the tube between the retaining ring 2 and the connector body 3. When the connector body 3 is assembled relative to the tube 1 by the fitting 4, it will squeeze the elastic ring 7 together with the retaining ring 2, causing it to deform. This allows the elastic ring 7 to generate radial and axial elastic force feedback to the retaining ring 2 and the connector body 3 at the same time. Thus, when subjected to vibration and impact, it can reduce the mutual impact in the axial direction and the relative friction in the radial direction between the contact surfaces of the connector body and the retaining ring, thereby maintaining structural stability and avoiding gap formation. The connector body 3, retaining ring 2 and elastic ring 7 work together to form a rigid sealing structure and a flexible sealing structure. The redundant sealing structure of the double seal effectively ensures the reliability of the seal.

[0019] The connector body 3 is fitted onto the port of the pipe fitting 1, and the kit 4 is fitted onto the pipe body on the side of the retaining ring 2 away from the port. The contact surface between the retaining ring 2 and the kit 4 is an outward-facing conical surface 21. When the pipe fitting tends to be pulled out, the kit 4 will form a directional resistance on the retaining ring, and this resistance will act directly on the conical surface 21. Firstly, within a limited radial distance, this allows for a larger contact area. Secondly, the force on the conical surface can automatically align the force with the axis, reducing unbalanced forces in directions other than the axial direction, ensuring the structural stability of the retaining ring 2 under high-intensity stress. The constraint force of the connector body 3 on the pipe fitting 1 mainly comes from the static friction resistance generated by the connector body 3 pressing the elastic ring 7 against the outer circumference of the pipe fitting 1. When the pipe fitting 1 tends to be pulled out, it only generates static friction resistance opposite to the pull-out force on the end of the pipe fitting, preventing deformation of the pipe fitting port under stress.

[0020] The contact surface between the retaining ring 2 and the connector body 3 is a disc surface 22 perpendicular to the axial direction. The fitting hole port of the connector body 3 is provided with an inwardly facing conical chamfer 31, which can radially press the elastic ring 7 onto the outer circular surface of the pipe fitting 1 and axially press the elastic ring 7 onto the disc surface 22. The conical chamfer 31 is a small-angle chamfer with an angle of 24° to the axial direction. During the assembly of the connector body, it gradually approaches and fits against the disc surface 22 of the retaining ring 2 along the axial direction. The conical chamfer 31 gradually compresses the elastic ring 7, and finally presses it onto the outer circular surface and the disc surface of the pipe fitting 1. Since the retaining ring 2 is integrally formed from the pipe fitting 1, the elastic ring 7 can simultaneously generate axial and radial elastic force feedback to the pipe fitting, achieving a multi-directional buffering effect between the connector body 3 and the pipe fitting 1, thereby improving the vibration and impact resistance of the connector structure.

[0021] The retaining ring 2 is formed by expanding the end of the pipe fitting 1, thus shaping the end of the pipe fitting 1 into a high-strength pipe section. This expansion process makes the local metal structure more compact, thereby enhancing its strength, especially on the two main stress-bearing surfaces: the conical surface 21 and the disc surface 22. Furthermore, due to the expansion process, an annular V-shaped groove is formed on the inner wall of the retaining ring 2 at the radially corresponding position, creating a dense structure around the bottom of the groove. This dense structure is located at the interface between the pipe fitting 1 and the retaining ring 2. This enhances the shear strength of the retaining ring 2 relative to the outer surface of the pipe fitting, preventing the retaining ring from breaking off relative to the pipe fitting when the pipe fitting is subjected to axial tensile force.

[0022] As attached Figure 2 As shown, an annular groove 8 is formed on the disc surface 22 close to the tube surface. The elastic ring 7 can be deformed by the conical chamfer 31 and fill the annular groove 8, forming a flexible sealing structure. When the connector body and the retaining ring are fully fitted, the chamfered surface at its port forms an annular space with the inner groove surface of the annular groove 8 and the corresponding outer circular surface of the tube. The cross-section of this annular space is a triangular cross-section with a small apex angle. This space is located on the only leakage path formed, and its small apex angle faces the liquid inlet end of the leakage path. The annular space is filled with the elastic ring 7. The elastic ring 7 is compressed so that its thickness decreases from the side closer to the retaining ring 2 to the side closer to the connector body 3, forming a flexible sealing structure. Figure 1 The triangular cross-sectional structure shown allows for a relatively larger contact area between the elastic ring 7 and the pipe fitting 1 and the connector body 3, making it more difficult for liquid to pass through. When oil enters this annular space, it exerts a thrust on the smallest corner edge of the deformed elastic ring 7, causing it to expand to both sides under pressure. This further enhances the tightness of the fit between the elastic ring and the pipe fitting 1 and the connector body 3. This tightness gradually increases as the oil pressure on the elastic ring gradually increases, resulting in a more reliable flexible seal.

[0023] As attached Figure 2 As shown, the outer ring of the disc surface 22 is formed with a stepped surface structure 9, which fits and conforms to the end of the connector body 3 to form a rigid sealing structure 6. In addition to the planar portion that fits with the end face of the connector body, the stepped surface structure 9 also includes a conical portion that fits with the chamfered surface of the connector body. This makes the mating surface of the rigid sealing structure a mating surface with a corner, making it more difficult for liquid to pass through. Furthermore, the presence of the conical surface allows for a tighter fit between the rigid mating surfaces, resulting in a stronger sealing effect. Therefore, on the only leakage path in the connector structure of this solution, a flexible seal, a conical rigid seal, and a planar rigid seal are formed sequentially from the inside out. The flexible seal can adaptively enhance the sealing effect with internal hydraulic pressure, and the rigid seal is also more stable due to improved resistance to pull-out, vibration, and impact. In summary, this effectively ensures the reliability of the seal.

[0024] In this embodiment, the elastic coil 7 can be adopted as shown in the attached figure. Figure 2 The symmetrical structure shown can, firstly, prevent improper assembly during actual assembly, thus avoiding poor sealing performance and improving assembly efficiency and error tolerance. Secondly, its two symmetrical inclined annular surfaces can better fit with the chamfered surface of the connector body 3 and the groove surface of the annular groove 8, thereby improving the sealing effect. Furthermore, the resulting tip is more easily squeezed by the connector body towards the retaining ring side, allowing the elastic ring to achieve a perfect filling effect relative to the annular space, further improving the sealing effect of the flexible seal.

[0025] The connector body 3 and the kit 4 are fitted together by a threaded structure 5. The connector body 3 can be a common external thread connector body, and the kit 4 is a corresponding matching nut. The threaded fit can ensure a reliable connection between the two, thereby ensuring the structural stability of the connector.

[0026] The above are merely preferred embodiments of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A hydraulic pipe fitting that can replace welding, characterized in that: The high-strength pipe section includes the end of the pipe fitting (1). A retaining ring (2) is integrally formed in the middle of the outer circular surface of the high-strength pipe section. A connector body (3) and a kit (4) are respectively fitted on the pipe body on both sides of the retaining ring (2). The part of the connector body (3) fitted on the pipe body can be inserted into the kit (4), and the kit (4) can form an axial constraint force on the inserted part of the connector body (3), so that the connector body (3) and the kit (4) axially clamp the retaining ring (2). An elastic ring (7) is fitted on the tube between the retaining ring (2) and the connector body (3). The connector body (3), the retaining ring (2) and the elastic ring (7) can cooperate to form a rigid sealing structure and a flexible sealing structure.

2. A hydraulic pipe fitting that can replace welding process according to claim 1, characterized in that: The connector body (3) is fitted onto the port of the pipe fitting (1), and the kit (4) is fitted onto the pipe body on the side away from the port of the retaining ring (2). The contact surface between the retaining ring (2) and the kit (4) is an outward-facing conical surface (21).

3. A hydraulic pipe fitting that can replace welding process according to claim 2, characterized in that: The contact surface between the retaining ring (2) and the connector body (3) is a disc surface (22) perpendicular to the axial direction. The fitting hole port of the connector body (3) is provided with an inwardly facing conical chamfer (31), which can radially press the elastic ring (7) on the outer circular surface of the pipe (1) and axially press the elastic ring (7) on the disc surface (22).

4. A hydraulic pipe fitting that can replace welding process according to claim 3, characterized in that: The retaining ring (2) is formed by expanding the end of the pipe fitting (1) and forming the end of the pipe fitting (1) into a high-strength pipe section; an annular V-shaped groove is formed on the inner wall of the retaining ring (2) at the radial corresponding position, so that the pipe wall around the bottom of the groove forms a dense structure, and the dense structure is located at the interface between the pipe fitting (1) and the retaining ring (2).

5. A hydraulic pipe fitting that can replace welding process according to claim 3, characterized in that: An annular groove (8) is formed on the disc surface (22) close to the tube surface. The elastic ring (7) can be squeezed and deformed by the chamfer (31) of the conical surface and fill the annular groove (8) to form a flexible sealing structure.

6. A hydraulic pipe fitting that can replace welding process according to claim 5, characterized in that: The elastic ring (7) is compressed so that its thickness decreases from the side closer to the retaining ring (2) to the side closer to the connector body (3).

7. A hydraulic pipe fitting that can replace welding process according to claim 6, characterized in that: The outer ring of the disc surface (22) is formed with a stepped surface structure (9), and the stepped surface structure (9) is adapted to fit the end of the connector body (3) to form a rigid sealing structure (6).

8. A hydraulic pipe fitting that can replace welding process according to claim 1, characterized in that: The connector body (3) and the kit (4) are fitted together by a threaded structure (5).

Images