A cooperative bidirectional contact dynamic sealing structure suitable for an oil passage interface

Abstract

The application provides a cooperative bidirectional contact seal structure suitable for an oil path interface, which comprises an axial fastener (1), a static part with an oil path (2), a rotating part with an oil path (3), a radial protection sleeve (5), an axial protection sleeve (6), a radial seal ring (7) and an axial seal ring (8). The rotating part with an oil path (3) is inserted into the static part with an oil path (2) and is connected through the axial fastener (1). The rotating part with an oil path (3) is processed with seal ring grooves in the radial and axial directions. The radial seal ring groove is sequentially assembled with the radial protection sleeve (5) and the radial seal ring (7), and the axial seal ring groove is sequentially assembled with the axial protection sleeve (6) and the axial seal ring (8). The static part with an oil path (2) forms radial and axial contact seals in the radial and axial directions, so that the probability of leakage of the oil pipe interface is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of engine lubrication system, specifically relating to a cooperative bidirectional contact dynamic sealing structure suitable for oil circuit interfaces. Background Technology

[0002] During the operation of an aircraft engine, the lubrication system plays a crucial role, primarily responsible for delivering lubricating oil to various critical engine components to achieve functions such as lubrication, cooling, and cleaning. The sealing performance of the lubrication line interfaces directly affects the reliability and safety of the entire lubrication system.

[0003] Currently, common connection structures for aero-engine lubricating oil pipeline interfaces include clamp-type rubber joint structures, flange-connected asbestos gasket axial sealing structures, and metal-sealed joint structures. Clamp-type rubber joint structures connect pipelines via rubber hoses and clamps, offering advantages such as easy installation and the ability to compensate for pipeline displacement to some extent. However, rubber materials are prone to aging and deformation under long-term high-temperature, high-pressure lubricating oil conditions, leading to seal failure and oil leakage. Furthermore, the tightness of the clamps significantly affects the sealing effect, making it difficult to guarantee good sealing performance; excessive tightening force may damage the hose. Flange-connected asbestos gasket axial sealing structures place the asbestos gasket between two opposing flange sealing surfaces, and tighten the flanges with bolts to compress the asbestos gasket and achieve a seal. The problem with this structure is that asbestos is harmful to human health, and under engine vibration and other operating conditions, the asbestos gasket is prone to wear and breakage, reducing the sealing effect and leading to oil leakage. Some metal sealing joints achieve sealing through a tight fit between metal parts. While they perform well in terms of high temperature and high pressure resistance, they require extremely high precision in the machining of the sealing surface; even minor machining errors can lead to a poor seal. Furthermore, metal joints lack sufficient elasticity, making them prone to seal failure under conditions of thermal expansion and contraction or vibration in the pipeline.

[0004] In addition to the static sealing methods mentioned above, common contact-type dynamic seals include graphite sealing devices, resilient open ring seals, and lip seals. While graphite sealing devices possess certain high-temperature resistance and self-lubricating properties, their drawbacks are also significant. In high-temperature environments, especially above 600℃, the mechanical properties of graphite decrease, leading to packing deformation and accelerated wear over long-term use, thus affecting sealing performance. In low-temperature environments, graphite becomes brittle, reducing its flexibility; brittle graphite packing is prone to cracking or even breakage, ultimately causing seal failure. Furthermore, graphite packing requires precise installation; during replacement, its soft texture causes breakage, leaving residue that is difficult to clean and increases maintenance costs. Resilient open ring seals also present numerous problems. Stress concentration easily forms at the opening, potentially leading to micro-leakage under high pressure. In high-speed or vibration scenarios, deformation at the opening can increase the gap, resulting in poor dynamic stability. During installation, resilient open rings require high precision, ensuring the bevels are aligned correctly; otherwise, the ring may twist. Additionally, resilient open ring installation is complex, requiring precise alignment of segmented components, which is time-consuming. The working surface of the elastic open ring seal requires high machining precision, and generally two to three layers are required, which occupies a large space. When using a lip seal, if the lubricating oil pressure is too high, the lip seal may be squeezed out of the sealing gap, causing seal failure.

[0005] In order to better adapt to the working environment of engine lubricating oil lines, there is an urgent need for a new type of contact dynamic sealing structure suitable for oil line interfaces to solve the problems existing in the prior art. Summary of the Invention

[0006] The technical solution of this invention is to provide a cooperative bidirectional contact dynamic sealing structure suitable for oil circuit interfaces, thereby reducing the probability of leakage at lubricating oil pipeline interfaces.

[0007] This invention provides a cooperative bidirectional contact dynamic sealing structure suitable for oil circuit interfaces, comprising: an axial fastener 1, a stationary component with an oil passage 2, a rotating component with an oil passage 3, a radial protective sleeve 5, an axial protective sleeve 6, a radial sealing ring 7, and an axial sealing ring 8; wherein, The rotating part 3 with an oil passage is inserted into the stationary part 2 with an oil passage and connected by the axial fastener 1; The rotating part 3 with oil passage has sealing ring grooves machined in both the radial and axial directions. The radial sealing ring groove is successively equipped with a radial protective sleeve 5 and a radial sealing ring 7, and the axial sealing ring groove is successively equipped with an axial protective sleeve 6 and an axial sealing ring 8, forming radial and axial contact seals with the stationary part 2 with oil passage in both the radial and axial directions.

[0008] Optionally, the end of the rotating part 3 with oil passage that contacts the stationary part 2 with oil passage includes, in sequence: an embedded part end 11, an annular boss end 10 and an oil pipe end 9; the stationary part 2 with oil passage includes, correspondingly, an annular recess end 13 and an oil pipe end 12. The embedded part end 11 is inserted into the annular recessed end 13, and the radial end face of the embedded part end 11 and the annular recessed end 13 abuts against each other. The outer wall of the embedded part end 11 is provided with a radial O-ring seal 7 and a radial protective sleeve 5, and is subjected to the radial pressure of the inner wall of the annular recessed end 13. The lower end face of the annular boss end 10 abuts against the upper end face of the annular concave end 13. The lower end face of the annular boss end 10 is provided with an axial O-ring seal 8 and an axial protective sleeve 6, and is subjected to pressure along the axial direction from the upper end face of the annular concave end 13.

[0009] Optionally, the axial fastener 1 applies a clamping force to the annular boss end 10 and the annular recess end 13.

[0010] Optionally, the outer diameter of the embedded part end 11 is larger than the outer diameter of the oil pipe end 9; The distance from the bottom of the sealing ring groove at the embedded end 11 to the inner wall is greater than or equal to twice the wall thickness of the oil pipe end 9.

[0011] Optionally, the rotating component 3 with oil passage is a hollow shaft structure, and a bearing is installed on the outer diameter of the rotating component 3 with oil passage, so that it can rotate relative to the axial fastener 1.

[0012] Optionally, the axial fastener 1 is engaged with the upper end face and side wall of the annular boss end 10 and the upper end face of the stationary part 2 with oil passage; The axial fastener 1 and the stationary part 2 with oil passage are connected by bolts, nuts and washers.

[0013] Optionally, the radial sealing ring 7 is an O-ring with an inner diameter smaller than the bottom diameter of the radial sealing ring groove and an outer diameter smaller than the outer diameter of the rotating part 3 with an oil passage at the location of the radial sealing ring groove.

[0014] Optionally, the axial sealing ring 8 is an O-ring with an inner diameter smaller than the inner wall diameter of the axial sealing ring groove and a thickness smaller than the depth of the axial sealing ring groove.

[0015] Optionally, the radial protective sleeve 5 and the axial protective sleeve 6 are made of a resilient polyurethane composite material.

[0016] Optionally, an oil pipe 4 may also be provided inside the stationary component 2 with an oil passage; The oil pipe 4 is welded together with the stationary part 2 with the oil passage or formed as a single piece.

[0017] This invention provides a cooperative bidirectional contact dynamic seal structure suitable for oil circuit interfaces, enabling contact dynamic sealing of oil circuits with relative rotation in a limited space, at low cost, and with easy installation. It solves the problems of poor sealing performance, low reliability, and complex structure of existing engine lubricating line interfaces, achieving efficient and stable sealing of oil circuit interfaces, improving the safety and reliability of the lubricating system, and reducing maintenance costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the collaborative bidirectional contact dynamic sealing structure according to an embodiment of the present invention; Explanation of reference numerals in the attached drawings: 1—Axial fastener, 2—Stationary part with oil passage, 3—Rotating part with oil passage, 4—Oil pipe, 5—Radial protective sleeve, 6—Axial protective sleeve, 7—Radial sealing ring, 8—Axial sealing ring, 9—Oil pipe end, 10—Annular boss end, 11—Embedded part end, 12—Oil pipe connection end, 13—Annular recess end. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0022] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0024] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0026] Specifically, such as Figure 1 As shown, this invention proposes a cooperative bidirectional contact dynamic seal structure suitable for oil circuit interfaces. This invention enables contact dynamic sealing of oil circuits with relative rotation in a limited space, at low cost and easy to install, solving the problems of poor sealing performance, low reliability and complex structure of existing engine lubricating oil pipeline interfaces. It achieves efficient and stable sealing of oil circuit interfaces, improves the safety and reliability of the lubricating oil system and reduces maintenance costs.

[0027] The present invention provides a cooperative bidirectional contact dynamic sealing structure suitable for oil circuit interfaces, comprising: an axial fastener 1, a stationary part with an oil circuit 2, a rotating part with an oil circuit 3, an oil pipe 4, a radial protective sleeve 5, an axial protective sleeve 6, a radial sealing ring 7, an axial sealing ring 8, an oil pipe end 9, an annular boss end 10, an embedded part end 11, an oil pipe connecting end 12, and an annular recess end 13.

[0028] The rotating part 3 with an oil passage is inserted into the stationary part 2 with an oil passage and connected by the axial fastener 1; The rotating component 3 with oil passages has sealing grooves machined in both radial and axial directions. A radial protective sleeve 5 and a radial O-ring 7, both made of elastic polyurethane composite material, are sequentially mounted on the radial sealing grooves. Similarly, an axial protective sleeve 6 and an axial O-ring 8, both made of elastic polyurethane composite material, are sequentially mounted on the axial sealing grooves, forming radial and axial contact seals with the stationary component 2 with oil passages in both radial and axial directions. The key feature is that the radial sealing ring 7 and the axial sealing ring 8 are respectively fitted with elastic and wear-resistant radial protective sleeves 5 and axial protective sleeves 6, forming radial and axial contact seals with the stationary component 2 with oil passages in both radial and axial directions.

[0029] The rotating part 3 with oil passage and the stationary part 2 with oil passage at the same end include, in sequence: an embedded part end 11, an annular boss end 10 and an oil pipe end 9; the stationary part 2 with oil passage includes, respectively, an annular recess end 13 and an oil pipe end 12.

[0030] The embedded part end 11 is inserted into the annular recessed end 13, and the radial end face of the embedded part end 11 and the annular recessed end 13 abuts against each other. The outer wall of the embedded part end 11 is provided with a radial O-ring seal 7 and a radial protective sleeve 5, and is subjected to the radial pressure of the inner wall of the annular recessed end 13. When the oil circuit interface is connected and in use, if the stationary part 2 with the oil circuit and the rotating part 3 with the oil circuit undergo small-range radial deformation, the radial sealing ring 7 and the radial protective sleeve 5 can still provide radial contact sealing to the radially abutting end faces of the outer wall of the embedded part end 11 and the inner wall of the annular concave end 13.

[0031] The lower end face of the annular boss end 10 abuts against the upper end face of the annular concave end 13. The lower end face of the annular boss end 10 is provided with an axial O-ring seal 8 and an axial protective sleeve 6, and is subjected to pressure along the axial direction from the upper end face of the annular concave end 13. When the oil circuit interface is connected and in use, if the stationary part 2 with the oil circuit and the rotating part 3 with the oil circuit undergo a small range of axial deformation, the axial sealing ring 8 and the axial protective sleeve 6 can still provide axial contact sealing to the axially abutting end faces of the lower end face of the annular boss end 10 and the upper end face of the annular concave end 13.

[0032] The stationary part 2 with oil passage and the rotating part 3 with oil passage are detachably connected by an axial fastener 1, which applies clamping force to the annular boss end 10 and the annular concave end 13.

[0033] The outer diameter of the embedded part end 11 is larger than the outer diameter of the tubing end 9. The outer wall of the embedded part end 11 is provided with a radial sealing groove. The radial sealing ring 7 and the radial protective sleeve 5 are located in the radial sealing groove. The inner wall of the annular recess end 13 presses against the outer circumference of the radial sealing ring 7. The distance from the bottom of the sealing ring groove of the embedded part end 11 to the inner wall is greater than or equal to twice the wall thickness of the tubing end 9.

[0034] The axial sealing groove is positioned close to the outer wall of the embedded part end 11, reducing the radial dimension of the boss end 10. The position of the axial sealing groove can also be moved a certain distance radially toward the outer wall of the annular boss end 10.

[0035] The rotating component 3 with oil passage is a hollow shaft structure. The outer diameter of the rotating component 3 with oil passage is equipped with a bearing, and it can rotate relative to the axial fastener 1.

[0036] The axial fastener 1 is engaged with the upper end face and side wall of the annular boss end 10 and the upper end face of the stationary part 2 with oil passage; The axial fastener 1 and the stationary part 2 with oil passage are connected by bolts, nuts and washers.

[0037] The radial sealing ring 7 is a standard O-ring, with an inner diameter smaller than the bottom diameter of the radial sealing ring groove and an outer diameter smaller than the outer diameter of the rotating part 3 with an oil passage at the location of the radial sealing ring groove, and reserved installation space for the radial protective sleeve 5. The axial sealing ring 8 is a standard O-ring, with an inner diameter smaller than the inner wall diameter of the axial sealing ring groove and a thickness smaller than the depth of the axial sealing ring groove, reserving installation space for the axial protective sleeve 6.

[0038] The radial protective sleeve 5 and the axial protective sleeve 6 need to be made of materials that are highly corrosion-resistant, not prone to aging, have good wear resistance, and can automatically compensate to a certain extent after wear, such as elastic polyurethane composite materials.

[0039] The radial sealing ring 7 is elastic, which allows the assembled radial protective sleeve 5 to fit tightly against the bottom end face of the radial sealing groove, ensuring the sealing effect of the dynamic seal.

[0040] Radial protective sleeve 5 and axial protective sleeve 6 are located in the inner ears of the radial sealing groove and axial sealing groove, respectively, to prevent the protective ring from getting stuck in the inner diameter of the stationary part during assembly and causing damage.

[0041] The number of radial sealing grooves on the outer wall of the embedded part end 11 is greater than or equal to 1. The radial sealing grooves are distributed along the axial direction of the outer wall of the embedded part end 11 and are equipped with corresponding radial sealing rings 7 and radial protective sleeves 5. The number of axial sealing grooves on the lower end face of the annular boss 10 is greater than or equal to 1. The axial sealing grooves are distributed along the radial direction of the lower end face of the annular boss 10 and are equipped with corresponding axial sealing rings 8 and axial protective sleeves 6.

[0042] The radial and axial sealing grooves on the rotating component 3 with oil passages include, but are not limited to, rectangular shapes, and may also be elliptical or other shapes.

[0043] The stationary component 2 with oil passage is also equipped with an oil pipe 4, which is welded together with the stationary component 2 with oil passage or integrally formed.

[0044] The method and structure for designing a coordinated bidirectional contact dynamic seal for the oil circuit interface, as described above, can achieve a satisfactory sealing effect.

[0045] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A cooperative bidirectional contact dynamic sealing structure suitable for oil circuit interfaces, characterized in that, include: Axial fastener (1), stationary component with oil passage (2), rotating component with oil passage (3), radial protective sleeve (5), axial protective sleeve (6), radial sealing ring (7), axial sealing ring (8); among which, The rotating part (3) with oil passage is inserted into the stationary part (2) with oil passage and connected by axial fastener (1); The rotating part (3) with oil passage has sealing ring grooves in both the radial and axial directions. A radial protective sleeve (5) and a radial sealing ring (7) are successively installed on the radial sealing ring groove, and an axial protective sleeve (6) and an axial sealing ring (8) are successively installed on the axial sealing ring groove, forming radial and axial contact seals with the stationary part (2) with oil passage in both the radial and axial directions.

2. The cooperative bidirectional contact dynamic sealing structure for oil circuit interfaces according to claim 1, characterized in that, The rotating part (3) with oil passage and the stationary part (2) with oil passage in contact with each other include: an embedded part end (11), an annular boss end (10) and an oil pipe end (9); the stationary part (2) with oil passage includes an annular recess end (13) and an oil pipe end (12). The embedded part end (11) is inserted into the annular recessed end (13), and the radial end faces of the embedded part end (11) and the annular recessed end (13) abut against each other. The outer wall of the embedded part end (11) is provided with a radial O-ring seal (7) and a radial protective sleeve (5), and is subjected to the radial pressure of the inner wall of the annular recessed end (13). The lower end face of the annular boss end (10) abuts against the upper end face of the annular concave end (13). The lower end face of the annular boss end (10) is provided with an axial O-ring seal (8) and an axial protective sleeve (6), and is subjected to pressure along the axial direction from the upper end face of the annular concave end (13).

3. The cooperative bidirectional contact dynamic sealing structure suitable for oil circuit interfaces according to claim 2, characterized in that, The axial fastener (1) applies a clamping force to the annular boss end (10) and the annular recess end (13).

4. The cooperative bidirectional contact dynamic sealing structure suitable for oil circuit interfaces according to claim 2, characterized in that, The outer diameter of the embedded part end (11) is larger than the outer diameter of the oil pipe end (9); The distance from the bottom of the sealing ring groove of the embedded part end (11) to the inner wall is greater than or equal to twice the wall thickness of the oil pipe end (9).

5. The cooperative bidirectional contact dynamic sealing structure for oil circuit interfaces according to claim 1, characterized in that, The rotating part (3) with oil passage is a hollow shaft structure. The outer diameter of the rotating part (3) with oil passage is fitted with a bearing, which can rotate relative to the axial fastener (1).

6. The cooperative bidirectional contact dynamic sealing structure for oil circuit interfaces according to claim 2, characterized in that, The axial fastener (1) is engaged with the upper end face and side wall of the annular boss end (10) and the upper end face of the stationary part (2) with oil passage; The axial fastener (1) and the stationary part (2) with oil passage are connected by bolts, nuts and washers.

7. The cooperative bidirectional contact dynamic sealing structure for oil circuit interfaces according to claim 1, characterized in that, The radial sealing ring (7) is an O-ring with an inner diameter smaller than the bottom diameter of the radial sealing ring groove and an outer diameter smaller than the outer diameter of the rotating part (3) with an oil passage at the location of the radial sealing ring groove.

8. The cooperative bidirectional contact dynamic sealing structure for oil circuit interfaces according to claim 1, characterized in that, The axial sealing ring (8) is an O-ring with an inner diameter smaller than the inner wall diameter of the axial sealing ring groove and a thickness smaller than the depth of the axial sealing ring groove.

9. The cooperative bidirectional contact dynamic sealing structure for oil circuit interfaces according to claim 1, characterized in that, The radial protective sleeve (5) and the axial protective sleeve (6) are made of elastic polyurethane composite material.

10. The cooperative bidirectional contact dynamic sealing structure for oil circuit interfaces according to claim 1, characterized in that, An oil pipe (4) is also installed inside the stationary part (2) with an oil passage; The oil pipe (4) is welded together with the stationary part (2) with the oil passage or formed as a single piece.

Images