Composite piston ring sealing device for aviation

Abstract

The invention discloses a composite piston ring sealing device for aviation. The composite piston ring sealing device comprises a composite piston ring sealing device for forming a damping oil film to realize sealing. Comprising a rotating shaft, and two piston ring grooves distributed at intervals are formed in the periphery of the rotating shaft; the rotary shaft is rotatably installed in the lining in a penetrating mode, a first-stage sealing structure and a second-stage sealing structure are correspondingly installed in piston ring grooves arranged at intervals outside the rotary shaft, a closed space is formed among the first-stage sealing structure, the second-stage sealing structure, the rotary shaft and the lining, and a damping oil film can be formed in the closed space. After a small amount of lubricating oil leaked by the first-stage sealing structure enters the closed space, the lubricating oil can be blocked by the second-stage sealing structure to form a large damping oil film to achieve sealing, meanwhile, the oil film has an excellent damping effect, and the problems that the leakage amount is large and sealing is poor due to the fact that a plain end piston ring is adopted are solved.

Description

Technical Field

[0001] The invention relates to an aviation composite expansion ring sealing device, belonging to the technical field of aviation engines. Background Art

[0002] In an aircraft engine, the engine shaft needs to be supported by a bushing for rotation. In the end surface of one side of the bushing, there is a medium flow environment, and the cooperation between the shaft and the bushing needs to be sealed.

[0003] In the prior art, metal expansion ring seals are mostly used in the rotating shafts of engines. Currently, most of the sealing devices use flat expansion rings, which have large leakage and poor sealing. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a composite expansion ring sealing device for aviation.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides an aviation composite expansion ring sealing device, comprising:

[0007] A composite expansion ring sealing device that forms a damping oil film to achieve sealing.

[0008] It comprises: a rotating shaft, and two expansion ring grooves distributed at intervals are arranged on the outer circumference of the rotating shaft;

[0009] The bushing, the rotating shaft can be rotatably installed inside the bushing, and the primary sealing structure and the secondary sealing structure are correspondingly installed in the expansion ring groove spaced outside the rotating shaft. A closed space is formed between the primary sealing structure, the secondary sealing structure, the rotating shaft and the bushing, and a damping oil film can be formed in the closed space.

[0010] The two expansion ring grooves on the outer periphery of the bushing are correspondingly equipped with a flat expansion ring, a stepped opening expansion ring, a 135-degree opening expansion ring, and a 45-degree opening expansion ring.

[0011] The flat-end expansion ring and the stepped-opening expansion ring form a primary sealing structure in the expansion ring groove at the first position.

[0012] The 135-degree opening expansion ring and the 45-degree opening expansion ring form a secondary sealing structure in the expansion ring groove at the second position; the secondary sealing structure is close to the medium flow direction side where the bushing and the rotating shaft cooperate to work.

[0013] The width of the expansion ring groove on the outer periphery of the rotating shaft is 0.5 mm to 1 mm greater than the width of the primary sealing structure and the secondary sealing structure.

[0014] The inner diameters of the flat expansion ring, stepped opening expansion ring, 135-degree opening expansion ring, and 45-degree opening expansion ring are smaller than the outer diameter of the shaft, and the outer diameters of the flat expansion ring, stepped opening expansion ring, 135-degree opening expansion ring, and 45-degree opening expansion ring are larger than the outer diameter of the shaft; the flat expansion ring, stepped opening expansion ring, 135-degree opening expansion ring, and 45-degree opening expansion ring are pressed into the expansion ring groove of the shaft through a bushing.

[0015] The openings of the flat-opening expansion ring, the stepped-opening expansion ring, the 135-degree-opening expansion ring, and the 45-degree-opening expansion ring are located at different positions outside the circumference of the bushing.

[0016] The beneficial effect of the present invention is that after a very small amount of lubricating oil leaks from the primary sealing structure into the enclosed space, the lubricating oil will be blocked by the secondary sealing structure to form a large damping oil film to achieve sealing. At the same time, the oil film has an excellent vibration reduction effect, which solves the problem of large leakage and poor sealing when using a flat expansion ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the opening of the 45-degree opening expansion ring at A of the present invention;

[0020] Figure 4 It is a schematic diagram of the opening of the 135-degree opening expansion ring at B of the present invention;

[0021] Figure 5 It is a schematic diagram of the step opening expansion ring opening at position C of the present invention;

[0022] Figure 6 It is a schematic diagram of the flat expansion ring opening at D of the present invention;

[0023] In the figure: 1-rotating shaft; 2-bushing; 3-flat opening expansion ring; 4-step opening expansion ring; 5-135 degree opening expansion ring; 6-45 degree opening expansion ring. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0025] like Figures 1 to 6 shown.

[0026] The present application discloses a composite expansion ring sealing device for aviation, comprising:

[0027] The rotating shaft 1 is in a rotating state during operation, and two expansion ring grooves distributed at intervals are arranged on the outer circumference of the rotating shaft 1.

[0028] The bushing 2 is in a fixed state when working, and the rotating shaft 1 can be rotatably installed inside the bushing 2; the two expansion ring grooves on the outer periphery of the bushing 2 are correspondingly installed with a flat expansion ring 3, a stepped opening expansion ring 4, a 135-degree opening expansion ring 5, and a 45-degree opening expansion ring 6; the flat expansion ring 3 and the stepped opening expansion ring 4 form a primary sealing structure in the expansion ring groove at the first position, and the 135-degree opening expansion ring 5 and the 45-degree opening expansion ring 6 form a secondary sealing structure in the expansion ring groove at the second position.

[0029] The secondary sealing structure is close to the medium flow direction side where the bushing 2 cooperates with the rotating shaft 1 .

[0030] The width of the expansion ring groove on the outer periphery of the rotating shaft 1 is 0.5 mm to 1 mm greater than the width of the primary sealing structure and the secondary sealing structure.

[0031] The inner diameters of the flat-end expansion ring 3, the stepped-opening expansion ring 4, the 135-degree opening expansion ring 5, and the 45-degree opening expansion ring 6 are smaller than the outer diameter of the rotating shaft 1, and the outer diameters of the flat-end expansion ring 3, the stepped-opening expansion ring 4, the 135-degree opening expansion ring 5, and the 45-degree opening expansion ring 6 are larger than the outer diameter of the rotating shaft 1; the flat-end expansion ring 3, the stepped-opening expansion ring 4, the 135-degree opening expansion ring 5, and the 45-degree opening expansion ring 6 are pressed into the expansion ring groove of the rotating shaft 1 through the bushing 2.

[0032] The openings of the flat-opening expansion ring 3 , the stepped-opening expansion ring 4 , the 135-degree-opening expansion ring 5 , and the 45-degree-opening expansion ring 6 are located at different positions outside the circumference of the bushing 2 .

[0033] A closed space is formed between the primary sealing structure, the secondary sealing structure, the shaft 1 and the bushing 2. When a small amount of lubricating oil leaks from the primary sealing structure into the closed space, the lubricating oil will be blocked by the secondary sealing structure to form a large damping oil film to achieve sealing. At the same time, the oil film has an excellent vibration reduction effect, which solves the problem of large leakage and poor sealing when using a flat expansion ring. At the same time, the oil film can achieve a vibration reduction effect on the shaft 1 and the bushing 2.

Claims

1. A composite expansion ring sealing device for aviation, characterized in that: include: A composite expansion ring sealing device that forms a damping oil film to achieve sealing.

2. The composite expansion ring sealing device for aviation according to claim 1, characterized in that: include: A rotating shaft (1), wherein two expansion ring grooves are arranged at intervals on the outer circumference of the rotating shaft (1); The bushing (2) is rotatably installed in the bushing (2), and the rotating shaft (1) is rotatably installed in the bushing (2). The expansion ring grooves of the outer space of the rotating shaft (1) are correspondingly installed with a primary sealing structure and a secondary sealing structure. A closed space is formed between the primary sealing structure, the secondary sealing structure, the rotating shaft (1) and the bushing (2), and a damping oil film can be formed in the closed space.

3. The composite expansion ring sealing device for aviation according to claim 2, characterized in that: Two expansion ring grooves on the outer periphery of the bushing (2) are correspondingly provided with a flat-end expansion ring (3), a stepped-opening expansion ring (4), a 135-degree-opening expansion ring (5), and a 45-degree-opening expansion ring (6).

4. The composite expansion ring sealing device for aviation according to claim 3, characterized in that: The flat-end expansion ring (3) and the stepped-opening expansion ring (4) form a primary sealing structure in the expansion ring groove at the first position.

5. The composite expansion ring sealing device for aviation according to claim 4, characterized in that: The 135-degree opening expansion ring (5) and the 45-degree opening expansion ring (6) form a secondary sealing structure in the expansion ring groove at the second position; the secondary sealing structure is close to the medium flow direction side of the bushing (2) and the rotating shaft (1) working in cooperation.

6. The composite expansion ring sealing device for aviation according to claim 2, characterized in that: The width of the expansion ring groove on the outer periphery of the rotating shaft (1) is 0.5 mm to 1 mm greater than the width of the primary sealing structure and the secondary sealing structure.

7. The composite expansion ring sealing device for aviation according to claim 5, characterized in that: The inner diameters of the flat-end expansion ring (3), the stepped-opening expansion ring (4), the 135-degree opening expansion ring (5), and the 45-degree opening expansion ring (6) are smaller than the outer diameter of the rotating shaft (1), and the outer diameters of the flat-end expansion ring (3), the stepped-opening expansion ring (4), the 135-degree opening expansion ring (5), and the 45-degree opening expansion ring (6) are larger than the outer diameter of the rotating shaft (1); the flat-end expansion ring (3), the stepped-opening expansion ring (4), the 135-degree opening expansion ring (5), and the 45-degree opening expansion ring (6) are pressed into the expansion ring groove of the rotating shaft (1) through the bushing (2).

8. The composite expansion ring sealing device for aviation according to claim 7, characterized in that: The openings of the flat-opening expansion ring (3), the stepped-opening expansion ring (4), the 135-degree-opening expansion ring (5), and the 45-degree-opening expansion ring (6) are located at different positions outside the circumference of the bushing (2).

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