Leakage-proof connecting structure of high-pressure oil pipe

Abstract

The utility model relates to the technical field of sealing structures, in particular to a leakage-proof connecting structure of a high-pressure oil pipe, which comprises the high-pressure oil pipe, a mounting flange, a flange core and a sealing ring, the high-pressure oil pipe, the mounting flange and the flange core are all made of steel, and the high-pressure oil pipe is clamped between the mounting flange and the flange core. The sealing rings are arranged between the flange core and the high-pressure oil pipe and on the end face, away from the high-pressure oil pipe, of the flange core. A flaring structure is arranged at the end part of the high-pressure oil pipe, and the external expansion angle 1 of the flaring structure is 37 degrees; a first equal-diameter pipe hole, a conical hole and a second equal-diameter pipe hole are sequentially formed in a through hole of the mounting flange, the diameters of the first equal-diameter pipe hole, the conical hole and the second equal-diameter pipe hole are continuously increased, a pipe body of the high-pressure oil pipe is located in the first equal-diameter pipe hole, a flaring structure of the high-pressure oil pipe is located in the conical hole, the taper angle 2 of the conical hole is 37 degrees, and the diameter of the second equal-diameter pipe hole is larger than the maximum diameter of the conical hole. The peripheral surface of the flange core is sequentially provided with a first equal-diameter ring surface, a conical surface and a second equal-diameter ring surface, the diameters of the first equal-diameter ring surface, the conical surface and the second equal-diameter ring surface are continuously increased, the first equal-diameter ring surface extends into a pipe body of the high-pressure oil pipe, the conical surface abuts against a flaring structure of the high-pressure oil pipe, the taper angle 3 of the conical surface is 37 degrees, and the diameter of the second equal-diameter ring surface is larger than the maximum diameter of the conical surface; when the high-pressure oil pipe is clamped by the mounting flange and the flange core, part of the flange core extends out of the mounting flange in the axial direction of the high-pressure oil pipe. The leakage-proof connecting structure for the high-pressure oil pipe is good in sealing performance, simple in structure and low in manufacturing and using cost.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures, in particular to a leakage-proof connection structure for a high-pressure oil pipe. Background Art

[0002] A large number of high-pressure oil pipes are provided in the profile extruder. The high-pressure oil pipes are connected to the high-pressure oil by means of a connecting structure. The sealing performance of the connecting structure affects the normal delivery and pressure transmission of the high-pressure oil.

[0003] To achieve a sealed connection between high-pressure oil pipes, specialized high-pressure oil pipe connectors have traditionally been required. However, these connectors are expensive to purchase, which in turn increases the manufacturing cost of the profile extruder. To address this issue, several new leak-proof connection structures have been designed in the prior art. However, these leak-proof connection structures are either complex or prone to oil leakage, resulting in low reliability. Therefore, there is a need for a leak-proof connection structure with improved performance. Utility Model Content

[0004] The purpose of the utility model is to provide a high-pressure oil pipe leak-proof connection structure, aiming to solve the problem of low reliability of the high-pressure oil pipe leak-proof connection structure in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a high-pressure oil pipe leak-proof connection structure, which includes a high-pressure oil pipe, a mounting flange, a flange core and a sealing ring. The high-pressure oil pipe, the mounting flange and the flange core are all made of steel. The high-pressure oil pipe is clamped between the mounting flange and the flange core. The sealing ring is arranged between the flange core and the high-pressure oil pipe and on the end face of the flange core away from the high-pressure oil pipe; the end of the high-pressure oil pipe is provided with a flared structure, and the outward expansion angle ∠1 of the flared structure is 37°; the through hole of the mounting flange is sequentially provided with a first equal-diameter pipe hole, a tapered hole and a second equal-diameter pipe hole with increasing diameters, and the pipe body of the high-pressure oil pipe is located at The first equal-diameter pipe hole, the flared structure of the high-pressure oil pipe is located in the tapered hole and the taper ∠2 of the tapered hole is 37°, and the diameter of the second equal-diameter pipe hole is larger than the maximum diameter of the tapered hole; the outer peripheral surface of the flange core is sequentially arranged as a first equal-diameter annular surface, a tapered surface, and a second equal-diameter annular surface with increasing diameters, the first equal-diameter annular surface extends into the pipe body of the high-pressure oil pipe, the tapered surface abuts the flared structure of the high-pressure oil pipe and the taper ∠3 of the tapered surface is 37°, and the diameter of the second equal-diameter annular surface is larger than the maximum diameter of the tapered surface; when the mounting flange and the flange core clamp the high-pressure oil pipe, part of the flange core extends out of the mounting flange along the axial direction of the high-pressure oil pipe.

[0006] Furthermore, a first step structure is formed between the conical hole and the second equal-diameter pipe hole, and a second step structure is formed between the conical surface and the second equal-diameter annular surface; when the mounting flange and the flange core clamp the high-pressure oil pipe, a gap exists between the first step structure and the second step structure.

[0007] Furthermore, the diameter of the second equal-diameter pipe hole is larger than the outer diameter of the flared structure.

[0008] Furthermore, the diameter of the second equal-diameter pipe hole is greater than the diameter of the second equal-diameter annular surface.

[0009] Furthermore, the conical surface is provided with a first annular groove for accommodating the sealing ring.

[0010] Furthermore, a plurality of circumferential recesses are provided at a position of the flared structure opposite to the first annular groove.

[0011] Furthermore, a second annular groove for placing a sealing ring is provided on the end face of the flange core away from the high-pressure oil pipe. With the second annular groove as the boundary, the end face of the high-pressure oil pipe is set to an outer end face outside the second annular groove and an inner end face inside the second annular groove. In the axial direction of the high-pressure oil pipe, the outer end face extends further from the mounting flange than the inner end face.

[0012] Furthermore, the thickness H3 of the outer end surface is 3 mm to 5 mm, and the value of the outer end surface protruding from the mounting flange is greater than the value of the inner end surface protruding from the mounting flange by H2, and H2 is 0.3 mm to 0.5 mm.

[0013] Furthermore, the flange core protrudes from the mounting flange by a value H1 of 2 mm to 3 mm in the axial direction of the high-pressure oil pipe.

[0014] The utility model provides a leak-proof connection structure for high-pressure oil pipes. This structure improves sealing performance by specifically designing the expansion angle of the flared structure, the taper of the tapered hole, and the taper of the tapered surface. Furthermore, a portion of the flange core is configured to extend beyond the mounting flange in the axial direction of the high-pressure oil pipe. This allows two adjacent flange cores, or the flange core and the oil outlet device, to fit more tightly together when the flanges are tightened. This allows the extended portion to compensate for manufacturing errors in components, improving sealing performance. Compared to existing technologies, this leak-proof connection structure for high-pressure oil pipes offers superior sealing performance, a simple structure, and low manufacturing and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an overall cross-sectional view of the leak-proof connection structure of the high-pressure oil pipe of the utility model;

[0016] Figure 2 yes Figure 1 A local enlarged view of point A;

[0017] Figure 3 It is a cross-sectional view of the high-pressure oil pipe;

[0018] Figure 4 It is a cross-sectional view of the mounting flange;

[0019] Figure 5 It is a cross-sectional view of the flange core;

[0020] Figure 6 yes Figure 3 A partial enlarged view of point B in the middle;

[0021] Figure 7 yes Figure 5 A partial enlarged view of point C in the middle.

[0022] Description of reference numerals:

[0023] 1. High-pressure oil pipe; 11. Expanded structure; 12. Circumferential depression;

[0024] 2. Mounting flange; 21. First equal-diameter pipe hole; 22. Conical hole; 23. Second equal-diameter pipe hole; 24. First stepped structure;

[0025] 3. Flange core; 31. First equal-diameter annular surface; 32. Conical surface; 33. Second equal-diameter annular surface; 34. Second stepped structure; 35. First annular groove; 36. Second annular groove; 37. Outer end surface; 38. Inner end surface;

[0026] 4. Gap. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention in detail.

[0028] In this embodiment, unless otherwise expressly specified and limited, when terms such as "set on", "connected", and "connected" appear, these terms should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected or connected through one or more intermediate media. For those skilled in the art, the specific meanings of the above terms in this embodiment can be understood according to the specific circumstances. The directional words that appear in this embodiment are for the purpose of better explaining the characteristics of the features and the relationship between the features. It should be understood that when the placement direction of this embodiment changes, the characteristics of the features and the direction of the relationship between the features also change accordingly. Therefore, the directional words do not constitute an absolute limitation on the characteristics of the features and the relationship between the features in space, but only play a relative limitation role.

[0029] The utility model provides a high-pressure oil pipe leak-proof connection structure, such as Figures 1 to 7As shown, it includes a high-pressure oil pipe 1, a mounting flange 2, a flange core 3 and a sealing ring (not shown in the figure). The high-pressure oil pipe 1, the mounting flange 2 and the flange core 3 are all made of steel. The high-pressure oil pipe 1 is clamped between the mounting flange 2 and the flange core 3. The sealing ring is arranged between the flange core 3 and the high-pressure oil pipe 1 and on the end face of the flange core 3 away from the high-pressure oil pipe 1; the end of the high-pressure oil pipe 1 is provided with a flaring structure 11, and the outward expansion angle ∠1 of the flaring structure 11 is 37°; the through hole of the mounting flange 2 is sequentially provided with a first equal-diameter pipe hole 21, a tapered hole 22 and a second equal-diameter pipe hole 23 with increasing diameters, the pipe body of the high-pressure oil pipe 1 is located in the first equal-diameter pipe hole 21, and the flared end of the high-pressure oil pipe 1 The structure 11 is located in the tapered hole 22 and the taper ∠2 of the tapered hole 22 is 37°. The diameter of the second equal-diameter pipe hole 23 is larger than the maximum diameter of the tapered hole 22. The outer peripheral surface of the flange core 3 is sequentially arranged as a first equal-diameter annular surface 31, a tapered surface 32, and a second equal-diameter annular surface 33 with increasing diameters. The first equal-diameter annular surface 31 extends into the tube body of the high-pressure oil pipe 1, the tapered surface 32 abuts against the flared structure 11 of the high-pressure oil pipe 1 and the taper ∠3 of the tapered surface 32 is 37°. The diameter of the second equal-diameter annular surface 33 is larger than the maximum diameter of the tapered surface 32. When the mounting flange 2 and the flange core 3 clamp the high-pressure oil pipe 1, part of the flange core 3 extends out of the mounting flange 2 along the axial direction of the high-pressure oil pipe 1.

[0030] This high-pressure oil pipe leak-proof connection structure relies on the close fit between components to achieve sealing. After two adjacent high-pressure oil pipe leak-proof connection structures are assembled, the sealing effect continues to improve as the mounting flanges 2 are tightened. However, dimensional errors are inevitable when manufacturing the components of this high-pressure oil pipe leak-proof connection structure, and dimensional errors can affect the sealing effect or even prevent sealing. To this end, this embodiment configures a portion of the flange core 3 to extend beyond the mounting flange 2 in the axial direction of the high-pressure oil pipe 1. When tightened, the two adjacent flange cores 3 or the flange core 3 and the oil outlet device can fit more tightly together. In this way, even if there are manufacturing errors in the components, the extended portion can compensate for the errors and ensure the sealing effect. At the same time, this embodiment also specifically designs the outward expansion angle of the flared structure 11, the taper of the tapered hole 22, and the taper of the tapered surface 32. After testing and verification, it was found that the sealing effect is optimal at this angle.

[0031] In this embodiment, a first step structure 24 is formed between the tapered hole 22 and the second constant-diameter pipe hole 23, and a second step structure 34 is formed between the tapered surface 32 and the second constant-diameter annular surface 33. When the mounting flange 2 and the flange core 3 clamp the high-pressure oil pipe 1, a gap 4 exists between the first step structure 24 and the second step structure 34. The presence of this gap 4 allows the components to deform when tightening the leak-proof connection structure.

[0032] In this embodiment, the diameter of the second equal-diameter pipe hole 23 is larger than the outer diameter of the flared structure 11, and the diameter of the second equal-diameter pipe hole 23 is also larger than the diameter of the second equal-diameter annular surface 33. This structural arrangement facilitates the placement of the high-pressure fuel pipe 1 into the mounting flange 2. Furthermore, when the mounting flange 2 is not tightened, the high-pressure fuel pipe 1 has a certain amount of room to move. When the mounting flange 2 is tightened, the cooperation of the tapered structures can exert a centering force on the high-pressure fuel pipe 1, allowing it to better move to the center axis of the mounting flange 2, thereby improving sealing performance.

[0033] In this embodiment, the conical surface 32 is provided with a first annular groove 35 for accommodating the sealing ring. A plurality of circumferential recesses 12 are provided in the flared structure 11 opposite the first annular groove 35. Based on this structure, when the entire leak-proof connection structure is installed, the circumferential recesses 12 compress and position the sealing ring, preventing it from shifting and improving sealing performance.

[0034] In this embodiment, the end surface of the flange core 3 facing away from the high-pressure oil pipe 1 is provided with a second annular groove 36 for accommodating a sealing ring. With the second annular groove 36 as the boundary, the end surface of the high-pressure oil pipe 1 is configured as an outer end surface 37 located outside the second annular groove 36 and an inner end surface 38 located inside the second annular groove 36. In the axial direction of the high-pressure oil pipe 1, the outer end surface 37 extends further from the mounting flange 2 than the inner end surface 38. If the end surface of the flange core 3 facing away from the high-pressure oil pipe 1 is configured as a flat surface, if the end surface of the flange core 3 is uneven or tilted due to manufacturing errors, when the two flange cores 3 abut each other, the two end surfaces may not be in close contact, or the flange cores 3 may be offset, preventing them from being in close contact elsewhere, which may affect sealing performance. To this end, in this embodiment, the outer end face 37 is arranged to protrude slightly from the inner end face 38, and the outer end face 37 is designed to be thinner, which makes the outer end face 37 easy to deform. During use, as the mounting flange 2 is continuously tightened, and because the end face of the flange core 3 is pushed against an external object or another flange core 3, the outer end face 37 is deformed. After the deformation, the outer end face 37 can be more closely attached to the external object or another flange core 3, so that the sealing between the flange core 3 and the external object or another flange core 3 is guaranteed.

[0035] In this embodiment, the flange core 3 protrudes from the mounting flange 2 by a value H1 of 2 mm to 3 mm along the axial direction of the high-pressure oil pipe 1. The thickness H3 of the outer end surface 37 is 3 mm to 5 mm. The outer end surface 37 protrudes from the mounting flange 2 by a value H2 greater than the inner end surface 38, which is 0.3 mm to 0.5 mm. This dimension range is the preferred range, providing excellent sealing performance.

[0036] In summary, this high-pressure oil pipe leak-proof connection structure has good sealing performance, simple structure, and low manufacturing and use costs.

[0037] In the absence of conflict, the above embodiments and features therein may be combined with each other.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the preferred technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the present invention.

Claims

1. A leak-proof connection structure for a high-pressure oil pipe, characterized by: The invention comprises a high-pressure oil pipe (1), a mounting flange (2), a flange core (3) and a sealing ring. The high-pressure oil pipe (1), the mounting flange (2) and the flange core (3) are all made of steel. The high-pressure oil pipe (1) is clamped between the mounting flange (2) and the flange core (3). The sealing ring is arranged between the flange core (3) and the high-pressure oil pipe (1) and on the end face of the flange core (3) away from the high-pressure oil pipe (1). The end of the high-pressure oil pipe (1) is provided with a flaring structure (11), and the flaring angle ∠1 of the flaring structure (11) is 37°; The through hole of the mounting flange (2) is sequentially provided with a first equal-diameter pipe hole (21), a tapered hole (22), and a second equal-diameter pipe hole (23) of increasing diameters; the pipe body of the high-pressure oil pipe (1) is located in the first equal-diameter pipe hole (21); the flared structure (11) of the high-pressure oil pipe (1) is located in the tapered hole (22); the taper ∠2 of the tapered hole (22) is 37°; and the diameter of the second equal-diameter pipe hole (23) is larger than the maximum diameter of the tapered hole (22); The outer peripheral surface of the flange core (3) is sequentially configured as a first equal-diameter annular surface (31), a conical surface (32), and a second equal-diameter annular surface (33) with increasing diameters. The first equal-diameter annular surface (31) extends into the body of the high-pressure oil pipe (1). The conical surface (32) abuts against the flared structure (11) of the high-pressure oil pipe (1). The conical surface (32) has a taper ∠3 of 37°. The diameter of the second equal-diameter annular surface (33) is greater than the maximum diameter of the conical surface (32). When the mounting flange (2) and the flange core (3) clamp the high-pressure oil pipe (1), a portion of the flange core (3) extends out of the mounting flange (2) along the axial direction of the high-pressure oil pipe (1).

2. The high-pressure oil pipe leak-proof connection structure according to claim 1, characterized in that: A first step structure (24) is formed between the tapered hole (22) and the second equal-diameter pipe hole (23), and a second step structure (34) is formed between the tapered surface (32) and the second equal-diameter annular surface (33); when the mounting flange (2) and the flange core (3) clamp the high-pressure oil pipe (1), a gap (4) exists between the first step structure (24) and the second step structure (34).

3. The leak-proof connection structure for high-pressure oil pipes according to claim 1, characterized in that: The diameter of the second equal-diameter pipe hole (23) is larger than the outer diameter of the flared structure (11).

4. The leak-proof connection structure for high-pressure oil pipes according to claim 1, characterized in that: The diameter of the second equal-diameter tube hole (23) is greater than the diameter of the second equal-diameter annular surface (33).

5. The high-pressure oil pipe leak-proof connection structure according to claim 1, characterized in that: The conical surface (32) is provided with a first annular groove (35) for accommodating a sealing ring.

6. The high-pressure oil pipe leak-proof connection structure according to claim 5, characterized in that: A plurality of circumferential recesses (12) are provided at positions of the flared structure (11) and the first annular groove (35) that are opposite to each other.

7. The high-pressure oil pipe leak-proof connection structure according to claim 1, characterized in that: The end face of the flange core (3) away from the high-pressure oil pipe (1) is provided with a second annular groove (36) for accommodating a sealing ring. With the second annular groove (36) as a boundary, the end face of the high-pressure oil pipe (1) is provided with an outer end face (37) located outside the second annular groove (36) and an inner end face (38) located inside the second annular groove (36). In the axial direction of the high-pressure oil pipe (1), the outer end face (37) protrudes further from the mounting flange (2) than the inner end face (38).

8. The leak-proof connection structure for high-pressure oil pipes according to claim 7, characterized in that: The thickness H3 of the outer end surface (37) is 3mm-5mm, and the value of the outer end surface (37) protruding from the mounting flange (2) is greater than the value of the inner end surface (38) protruding from the mounting flange (2) by H2, and H2 is 0.3mm-0.5mm.

9. The high-pressure oil pipe leak-proof connection structure according to any one of claims 1 to 8, characterized in that: The flange core (3) protrudes from the mounting flange (2) by a value H1 of 2 mm to 3 mm in the axial direction of the high-pressure oil pipe (1).

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