Hydraulic sealing joints

Abstract

The application discloses a hydraulic sealing joint, comprising a sealing core and a locking piece, wherein the sealing core comprises a main body part, a guide part and a hard sealing part, the diameter of the main body part is larger than that of the guide part, the main body part and the guide part are connected through the hard sealing part, the side surface of the hard sealing part is extended from the side surface edge of the main body part to the side surface edge of the guide part, the guide part is a cylinder and is matched with a middle sink hole of a female joint part, the side surface of the hard sealing part is matched with an outer interface of the female joint part, and the locking piece is sleeved on the sealing core and is used for being fixed with the outer surface of the female joint part. The hydraulic sealing joint adopting the above technical scheme is easy to assemble, has better sealing effect and stable sealing structure.

Description

Technical Field

[0001] The present invention relates to the field of mechanical devices, and in particular to a hydraulic sealing joint. Background Art

[0002] The 24° conical sealing structure commonly used in hydraulic pipe fittings at this stage includes O-ring conical structure and ferrule conical structure. In the 24° conical structure, the connector mother part and the locking part can be used interchangeably, and the stop structure of the locking part can be adjusted according to the corresponding specifications.

[0003] The O-ring conical structure has no positive assembly guide, so the sealing core is prone to axial deviation relative to the connector mother, which makes assembly difficult and has poor sealing effect during actual use. The ferrule-type conical structure is formed by the ferrule deforming between the conical surface of the connector mother and the sealing core to form a double sealing surface (between the ferrule and the connector mother, and between the ferrule and the sealing core). During actual use, the ferrule and the sealing core are prone to loose fit, resulting in sealing failure. In addition, the ferrule itself has a thin structure, and the conical sealing surface is very prone to failure. Failure of any sealing surface will cause the entire sealing structure to fail. Summary of the Invention

[0004] Purpose of the invention: The present invention aims to provide a hydraulic sealing joint which is easy to assemble, has a good sealing effect and a stable sealing structure.

[0005] Technical solution: The present invention provides a hydraulic sealing joint, comprising: a sealing core and a locking member, wherein:

[0006] The sealing core comprises a main body, a guide portion and a hard sealing portion, wherein the diameter of the main body is larger than the diameter of the guide portion, the main body and the guide portion are connected by the hard sealing portion, and the side surface of the hard sealing portion extends from the side edge of the main body to the side edge of the guide portion;

[0007] The guide portion is a column that cooperates with the countersunk hole of the female connector;

[0008] The side surface of the hard seal portion cooperates with the outer interface of the female connector;

[0009] The locking piece is sleeved on the sealing core and is used to be fixed to the outer surface of the female connector piece.

[0010] Specifically, the side surface of the hard sealing portion is a curved surface.

[0011] Specifically, in the portion where the hard sealing portion and the female joint member contact each other, the hardness of the material of the hard sealing portion is lower than the hardness of the material of the female joint member.

[0012] Specifically, the guide portion is clearance-matched with the countersunk hole of the female connector.

[0013] Specifically, it also includes: a sealing ring, which is sleeved on the guide part, and the part of the ring in contact with the guide part includes a straight line in the longitudinal section.

[0014] Specifically, in the longitudinal section of the ring, the compression portion used for compression after contacting the female connector occupies 0% to 40% of the longitudinal section of the ring.

[0015] Specifically, in the longitudinal section of the ring, the compression portion used for compression after contacting the female connector occupies 15% to 30% of the longitudinal section of the ring.

[0016] Specifically, the longitudinal section of the ring is a quadrilateral.

[0017] Specifically, the longitudinal section of the ring is rectangular.

[0018] Specifically, the locking member is a nut, which is used to cooperate with the thread on the outer surface of the connector mother member.

[0019] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: easy assembly, good sealing effect, and stable sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of the hydraulic sealing joint provided by the present invention;

[0021] Figure 2 A schematic diagram of a partial structure of the hydraulic sealing joint provided by the present invention;

[0022] Figure 3 A longitudinal section of the sealing ring of the hydraulic sealing joint provided by the present invention;

[0023] 1- Sealing core; 2- Sealing ring; 3- Locking part; 4- Connector mother part; 5- Stop structure; 6- Main body; 7- Hard sealing part; 8- Guide part; 9- External interface of the connector mother part; 10- Countersunk hole of the connector mother part; 11- Conical surface of the inner cavity of the external interface of the connector mother part; 12- Sealing cavity; 13- Longitudinal section of the ring; 14- The part of the longitudinal section of the ring that contacts the guide part; 15- Compression part. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0025] See Figure 1 、 Figure 2 , which are respectively a structural schematic diagram of the hydraulic sealing joint provided by the present invention, and a partial structural schematic diagram of the hydraulic sealing joint provided by the present invention.

[0026] The hydraulic sealing joint provided in the embodiment of the present invention is generally applied to a 24° conical sealing structure, but is not limited to the 24° conical sealing structure. It can also be applied to other sealing structures by making corresponding adjustments according to the structure of the joint mother part 4.

[0027] A hydraulic sealing joint is provided in an embodiment of the present invention, comprising: a sealing core 1 and a locking piece 3, wherein: the sealing core 1 comprises a main body 6, a guide part 8 and a hard sealing part 7, the diameter of the main body 6 is larger than the diameter of the guide part 8, the main body 6 and the guide part 8 are connected through the hard sealing part 7, and the side surface of the hard sealing part 7 extends from the side edge of the main body 6 to the side edge of the guide part 8; the guide part 8 is a cylinder, which cooperates with the center countersunk hole 10 of the joint mother part 4; the side surface of the hard sealing part 7 cooperates with the external interface 9 of the joint mother part 4; the locking piece 3 is sleeved on the sealing core 1 and is used to be fixed to the outer surface of the joint mother part 4.

[0028] In specific implementation, during the actual processing, the main body 6, the guide part 8 and the hard sealing part 7 are usually integrally formed to form the sealing core 1, and the sealing core 1 is hollow to allow liquid to pass through.

[0029] In a specific implementation, the side surface of the hard sealing portion 7 extends from the side edge of the main body portion 6 to the side edge of the guide portion 8, that is, the side surfaces of the main body portion 6, the hard sealing portion 7 and the guide portion 8 are continuous.

[0030] In the embodiment of the present invention, the guide portion 8 is clearance-fitted with the countersunk hole 10 of the female connector 4. The diameter of the cross section of the guide portion 8 is smaller than or equal to the diameter of the countersunk hole 10 of the female connector 4.

[0031] In a specific implementation, the countersunk hole 10 of the female connector 4 is generally cylindrical, and the guide portion 8 is cylindrical corresponding to the countersunk hole 10. Figure 1 、 Figure 2 In the manner shown, the guide portion 8 is partially inserted into the countersunk hole 10 to achieve a clearance fit between the guide portion 8 and the countersunk hole 10 (which may include a minimum clearance equal to zero), and the axis of the guide portion 8 and the axis of the countersunk hole 10 can be maintained on the same straight line. The guide portion 8 itself can serve as a positive assembly guide for the sealing core 1, thereby avoiding axial deviation of the sealing core 1 relative to the joint mother part 4 during the assembly process of the sealing core 1 and the joint mother part 4, simplifying the assembly process steps and reducing the prescribed requirements for assembly.

[0032] In practice, the side of the hard seal 7 mates with the external interface 9 of the female connector 4. A closed loop or annular surface forms on the side of the hard seal 7, contacting the inner conical surface 11 of the female connector 4's external interface 9 (or contacting the edge of the female connector 4's external interface 9), forming a hard seal. When the seal core 1 is assembled correctly, this closed loop or annular surface abuts against the corresponding portion of the female connector 4, eliminating any gaps that could cause leakage. This hard seal structure is very stable and not prone to center deviation. With this stable seal structure, the sealing effect is also good in actual use.

[0033] In the specific implementation, the gap between the sealing core 1 and the inner conical surface 11 of the joint mother part 4 after assembly forms a sealing cavity 12. The longitudinal section of the sealing cavity 12 is approximately triangular. Since the triangular structure has a natural strong stability, the sealing cavity 12 has a high structural strength. When it is subjected to hard extrusion deformation by external force, the deformation of the sealing cavity 12 is reduced, and the hard sealing structure is very stable.

[0034] In a specific implementation, the joint mother part 4 and the locking part 3 can be universal, and the stopping structure 5 of the locking part 3 can be adjusted according to the corresponding specifications, so that the hydraulic sealing joint can be applied to joint mother parts 4 of different specifications.

[0035] In the embodiment of the present invention, the locking member 3 is a nut, which is used to cooperate with the thread on the outer surface of the connector female member 4.

[0036] In the embodiment of the present invention, the side surface of the hard sealing portion 7 is a curved surface.

[0037] In practice, curved surfaces offer a smoother transition than flat surfaces, while inclined surfaces place higher demands on the processing technology. If a portion or point along the circumference of the inclined surface fails to contact the inner conical surface 11 of the outer interface 9 of the female connector 4, that is, if the side surface of the hard seal portion 7 does not form a closed loop or annular surface that contacts the inner conical surface 11 of the outer interface 9 of the female connector 4 to form a hard seal, the curved side surface of the hard seal portion 7 reduces the processing requirements.

[0038] In the embodiment of the present invention, in the portion where the hard sealing portion 7 and the female connector 4 contact each other, the hardness of the material of the hard sealing portion 7 is lower than the hardness of the material of the female connector 4 .

[0039] In a specific implementation, since the hard sealing part 7 and the joint mother part 4 are usually made of the same material as a whole, in this case, the material hardness of the hard sealing part 7 as a whole is lower than the material hardness of the joint mother part 4 as a whole; and if the contact part is not made of the same material as the other parts of the whole, specifically in the part where the hard sealing part 7 and the joint mother part 4 contact each other, the material hardness of the hard sealing part 7 is lower than the material hardness of the joint mother part 4.

[0040] In practice, the material hardness of the hard seal portion 7 is lower than that of the female connector 4. During assembly, the side surfaces of the hard seal portion 7 are more likely to deform after contact and compression with the inner conical surface 11 of the female connector 4. This allows for a tighter fit between the hard seal portion 7 and the inner conical surface 11 of the external interface 9 of the female connector 4, improving the stability and effectiveness of the sealing structure. Furthermore, deformation of the side surfaces of the hard seal portion 7 does not affect the fitted sealing ring 2, ensuring a very stable overall sealing structure.

[0041] In practice, experiments have shown that the hard seal structure of the hydraulic sealing joint proposed in the embodiments of the present invention can achieve zero leakage on both sides of the seal structure under operating pressures of 30 MPa for light-duty applications and 50 MPa for heavy-duty applications, as specified in the applicable structural standard ISO 8434. The overall assembly exhibits strong structural stability. Furthermore, the sealing joint core itself has been tested to withstand pressures of 50 MPa for light-duty applications and 80 MPa for heavy-duty applications, providing comprehensive safety redundancy.

[0042] In the embodiment of the present invention, the hydraulic sealing joint further comprises: a sealing ring 2, which is sleeved on the guide portion 8, and a portion 14 ( Figure 3 The bold part) includes a straight line.

[0043] In specific implementation, in the prior art, the longitudinal cross-section 13 of the sealing ring 2 is usually circular or elliptical. During assembly or actual use, the sealing ring 2 is prone to rolling or sliding, which in turn leads to uneven contact between the sealing ring 2 and the inner conical surface 11 of the outer interface 9 of the female connector 4, or damage to the sealing ring 2, resulting in an unstable sealing structure and poor sealing effect. Figure 3 The portion of the longitudinal section 13 of the sealing ring 2 in contact with the guide portion 8 includes a straight line. This straight line portion can increase the static contact area with the sealing core 1, increase the sealing area after pressure, increase friction, reduce rolling and sliding, and the overall sealing structure is very stable.

[0044] In the embodiment of the present invention, in the longitudinal section 13 of the ring, the compression portion 15 for compression after contacting the female connector 4 occupies 0% to 40% of the longitudinal section 13 of the ring.

[0045] In the embodiment of the present invention, in the longitudinal section 13 of the ring, the compression portion 15 for compression after contacting the female connector 4 occupies 15% to 30% of the longitudinal section 13 of the ring, preferably 20% to 25%.

[0046] In practice, by adjusting the percentage of the area of ​​the compressed portion 15 in the longitudinal cross-section 13, which is compressed after contact with the inner conical surface 11 of the female connector 4, relative to the area of ​​the ring's longitudinal cross-section 13, the sealing area of ​​the sealing ring 2 after contact and compression with the inner conical surface 11 of the female connector 4's external interface 9 can be increased, thereby enhancing friction. If the area percentage is 20% to 25%, damage to the sealing ring 2 due to excessive compression is prevented, while also achieving an effective sealing area and sealing strength, resulting in an excellent overall sealing effect and improving the stability and sealing effect of the overall sealing structure.

[0047] In the embodiment of the present invention, the longitudinal section 13 of the ring is a quadrilateral.

[0048] In the embodiment of the present invention, the longitudinal section 13 of the ring is rectangular.

[0049] In specific implementation, compared with other longitudinal cross-sectional shapes, the rectangle has lower requirements for processing technology and assembly, while having better actual assembly and use effects, achieving the best balance between processing, assembly and use effects.

[0050] In a specific implementation, the embodiment of the present invention has two independent sealing structures, namely a hard sealing structure and a soft sealing structure of the sealing ring 2 , and both sealing structures have excellent sealing effects and extremely stable sealing structures.

[0051] In specific implementation, because of the existence of the hard sealing structure, the hydraulic sealing joint proposed in the embodiment of the present invention can continue to achieve sealing through the hard sealing structure when the sealing ring 2 fails (damage, aging, ablation, etc.). When the emergency maintenance is completed, the sealing ring 2 is replaced to re-achieve double sealing protection.

Claims

1. A hydraulic sealing joint, characterized in that: include: Sealing core, sealing ring and locking piece, including: The sealing core comprises a main body, a guide portion and a hard sealing portion, wherein the diameter of the main body is larger than the diameter of the guide portion, the main body and the guide portion are connected by the hard sealing portion, and the side surface of the hard sealing portion extends from the side edge of the main body to the side edge of the guide portion; The guide portion is a column that cooperates with the countersunk hole of the female connector; the sealing ring is sleeved on the guide portion, and the portion of the sealing ring in contact with the guide portion in the longitudinal section includes a straight line; The side surface of the hard seal portion is a curved surface, which cooperates with the external interface of the female joint member; in the portion where the hard seal portion and the female joint member contact each other, the hardness of the material of the hard seal portion is lower than the hardness of the material of the female joint member; The locking piece is sleeved on the sealing core and is used to be fixed to the outer surface of the female connector piece.

2. The hydraulic sealing joint according to claim 1, characterized in that: The guide portion is clearance-matched with the countersunk hole of the female connector.

3. The hydraulic sealing joint according to claim 1, characterized in that: In the longitudinal section of the ring, the compression portion for compression after contacting the female connector occupies 0% to 40% of the longitudinal section of the ring.

4. The hydraulic sealing joint according to claim 3, characterized in that: In the longitudinal section of the ring, the compression portion used for compression after contacting the female connector occupies 15% to 30% of the longitudinal section of the ring.

5. The hydraulic sealing joint according to claim 1, characterized in that: The longitudinal section of the ring is a quadrilateral.

6. The hydraulic sealing joint according to claim 5, characterized in that: The longitudinal section of the ring is rectangular.

7. The hydraulic sealing joint according to any one of claims 1 to 6, characterized in that: The locking piece is a nut, which is used to cooperate with the thread on the outer surface of the female connector.

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