Air compressor combined seal bearing

Abstract

The present invention relates to the supporting of aviation equipment, specifically to a combined sealed bearing for an air compressor, comprising: a first bearing unit, a second bearing unit, and a third bearing unit; the three bearing units form an integral combined bearing; the three bearing units are commonly connected to a connecting shaft, and the lower half of the first bearing unit and the connecting shaft form the lower part of the integral combined bearing; the second bearing unit, the third bearing unit, and the upper half of the connecting shaft form the upper part of the integral combined bearing; according to the requirements of the host motion conduction and spatial requirements, a double-rotating axis structure is adopted, which can meet the usage requirements of aviation and other supporting components for lightweight, integration, and high precision, and has the advantages of light weight, high precision, and long service life; sealing form: gap sealing structures that meet the requirements of each part are respectively adopted for the lubrication performance requirements of different parts of the combined bearing to ensure that daily maintenance of the bearing is not required while meeting the lubrication requirements.

Description

Technical Field

[0001] The present invention relates to the supporting of aviation equipment, specifically to a combined seal bearing of an air compressor, which is applicable to the field of aviation accessories. Background Art

[0002] The development level of the aviation industry is an important symbol of scientific and technological capabilities, economic development, and the living standards of the people. Aviation equipment reflects a country's overall strength and is related to the overall industrial strength and national defense security of our country. Therefore, the research and development of various new aircraft and aviation equipment have become strategic emerging industries that our country focuses on with more energy. Among them, as a basic component for supporting rotation, bearings have become increasingly important with the continuous development of aviation technology and the continuous breakthrough and improvement of the extreme performance of aviation equipment. The performance and accuracy of bearings directly affect the accuracy and performance of the main engine. The development of aviation bearings is moving towards lightweight, integrated, and high-precision. Summary of the Invention

[0003] In view of the continuously increasing requirements of the above-mentioned aviation equipment for bearings, the purpose of the present invention is to provide a combined seal bearing of an air compressor, which meets the requirements of bearing lightweight, integration, and high-precision for supporting components in the aviation field.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a combined seal bearing of an air compressor, including: a first bearing unit, a second bearing unit, and a third bearing unit; the three bearing units form an integral combined bearing; the integral combined bearing is sequentially provided with the first bearing unit, the second bearing unit, and the third bearing unit from bottom to top. The three bearing units are commonly connected to a connecting shaft. The first bearing unit and the lower half of the connecting shaft form the lower half of the integral combined bearing; the second bearing unit, the third bearing unit, and the upper half of the connecting shaft form the upper half of the integral combined bearing.

[0005] Further, the axis of the lower half of the integral combined bearing is the first axis, and the axis of the upper half of the integral combined bearing is the second axis. An inclination angle is provided between the first axis and the second axis.

[0006] Further, the inclination angle between the first axis and the second axis is an acute angle.

[0007] Further, the first bearing unit is a double-row angular contact ball bearing, and the second bearing unit and the third bearing unit are both single-row angular contact ball bearings.

[0008] Further, the upper half and the lower half of the connecting shaft are of an integral special-shaped structure. The outer diameter of the lower half is larger than that of the upper half, and the upper half is inclined relative to the lower half.

[0009] Further, the second bearing unit and the third bearing unit concentrically penetrate through the upper half of the connecting shaft;

[0010] Further, the connecting shaft is of a hollow shaft structure;

[0011] Further, the first bearing unit includes: a first outer ring, a second outer ring, a first inner ring, a first row of steel balls, a second row of steel balls, a first cage, a second cage, a first seal ring, and a second seal ring; the first inner ring is of a double raceway structure, the inner diameter of the first inner ring is connected in a matching manner with the outer diameter of the lower half of the connecting shaft, the first outer ring and the second outer ring are respectively arranged outside the first inner ring from bottom to top, the first cage and the second cage are respectively installed between the first inner ring and the first outer ring, and between the first inner ring and the second outer ring, the first row of steel balls and the second row of steel balls are respectively installed in the pocket holes of the first cage and the second cage, the first seal ring is arranged between the first inner ring and the first outer ring close to the lower end face direction of the first bearing unit, and the second seal ring is arranged between the first inner ring and the second outer ring close to the other end face direction of the first bearing unit;

[0012] Further, the first bearing unit further includes an opposed wave spring, which is a constant pressure preloading structure inside the bearing;

[0013] Further, the opposed wave springs are respectively arranged between the first inner ring and the first outer ring in the opposite direction to the first seal ring, and between the first inner ring and the second outer ring in the opposite direction to the second seal ring;

[0014] The opposed wave spring serves as a preloading structure of the first bearing unit and provides a preloading force between the double-row angular contact ball bearings of the first bearing unit.

[0015] Further, the outer diameter in the direction of the outer end face of the second outer ring is provided with a horizontally extending platform, and a connecting hole is opened on the horizontally extending platform for connecting with an external component through a connecting piece.

[0016] Further, the second bearing unit includes: a third outer ring, a third inner ring, a third row of steel balls, a third cage, and a third seal ring; the inner diameter of the third inner ring is connected in a matching manner with the outer diameter of the upper half of the connecting shaft, the third cage is installed between the third inner ring and the third outer ring, the third row of steel balls is installed in the pocket hole of the third cage, and the third seal ring is arranged between the third inner ring and the third outer ring of the second bearing unit close to the lower end direction of the upper half of the connecting shaft;

[0017] Further, the outer diameter of the third outer ring is provided with a bent extension part, and the inner diameter of the bent extension part is matched with the outer diameter of the third bearing unit; a connecting hole is opened in the bent extension part, which plays a role in bearing the positioning preloading of the second and third bearing units.

[0018] Further, the third bearing unit includes: a fourth outer ring, a fourth inner ring, a fourth row of steel balls, a fourth cage, and a fourth sealing ring; the inner diameter of the fourth inner ring is fitted and connected with the outer diameter of the upper half of the connecting shaft and is concentrically and closely arranged with the third inner ring. The fourth cage is installed between the fourth inner ring and the fourth outer ring, the fourth row of steel balls is installed in the pocket holes of the fourth cage, and the fourth sealing ring is arranged between the fourth inner ring and the fourth outer ring in the direction close to the outer end face of the third bearing unit.

[0019] Further, the first sealing ring, the second sealing ring, the third sealing ring, and the fourth sealing ring are all of special-shaped ring structures.

[0020] The lower half of the overall combined bearing rotates around the first axis, and the upper half of the overall combined bearing rotates around the second axis, forming a double-rotating axis structure.

[0021] The present invention adopts respective sealing structures for the clearances required by the first bearing unit, the second and third bearing units of the combined bearing to achieve the lubrication performance of different parts, thereby ensuring that the daily maintenance of the bearing is avoided while meeting the lubrication requirements;

[0022] In the internal structure of the combined bearing of the present invention, according to the performance requirements of the main engine and the space and assembly requirements of the combined bearing, the internal structure of the third row of bearings in the second bearing unit is reformed.

[0023] The beneficial effects of the present invention are as follows: According to the requirements of the main engine's motion conduction and space requirements, a double-rotating axis structure is adopted, which can meet the usage requirements of lightweight, integration, and high precision for supporting components such as aviation, and has the advantages of light weight, high precision, and long service life; Sealing form: Gap sealing structures that meet the requirements of each part are respectively adopted for the lubrication performance requirements of different parts of the combined bearing to ensure that the daily maintenance of the bearing is avoided while meeting the lubrication requirements; Preloading form: To improve the stiffness of the bearing, a preloading method of fixed-pressure preloading at the front end and positioning preloading at the rear end is adopted; An assembly technology for the combined bearing is invented. The four sets of bearings in the combined bearing adopt three different assembly schemes respectively, solving the problem of difficult assembly; A method for ensuring the dimensional stability encountered during the heat treatment process of special-shaped shafts and special-shaped raceways is invented. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the present invention.

[0025] In the figure, 1 is the first axis center, 2 is the second axis center, 3 is the lower half of the connecting shaft, 4 is the upper half of the connecting shaft, 5 is the first outer ring, 6 is the second outer ring, 7 is the first inner ring, 8 is the first row of steel balls, 9 is the second row of steel balls, 10 is the first cage, 11 is the second cage, 12 is the first sealing ring, 13 is the second sealing ring, 6.1 is the connecting hole, 14 is the third outer ring, 15 is the third inner ring, 16 is the third row of steel balls, 17 is the third cage, 18 is the third sealing ring, 14.1 is the bending extension part, 19 is the fourth outer ring, 20 is the fourth inner ring, 21 is the fourth row of steel balls, 22 is the fourth cage, 23 is the fourth sealing ring, and 24 is the opposed wave spring. Specific Embodiment

[0026] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] As Figure 1 shown, the combined seal bearing of the air compressor includes: a first bearing unit, a second bearing unit, and a third bearing unit; the three bearing units form an integral combined bearing; the integral combined bearing is sequentially provided with the first bearing unit, the second bearing unit, and the third bearing unit from bottom to top, and the three bearing units are commonly connected to a connecting shaft. The first bearing unit and the lower half 3 of the connecting shaft form the lower half of the integral combined bearing; the second bearing unit, the third bearing unit, and the upper half 4 of the connecting shaft form the upper half of the integral combined bearing.

[0028] Further, the axis center of the lower half of the integral combined bearing is the first axis center 1, and the axis center of the upper half of the integral combined bearing is the second axis center 2. An inclination angle is provided between the first axis center 1 and the second axis center 2.

[0029] Further, the inclination angle between the first axis center 1 and the second axis center 2 is an acute angle.

[0030] Further, the upper half 4 and the lower half 3 of the connecting shaft are of an integral special-shaped structure. The outer diameter of the lower half 3 is greater than the outer diameter of the upper half 4, and the upper half 4 is inclined relative to the lower half 3.

[0031] Further, the second bearing unit and the third bearing unit concentrically penetrate through the upper half 4 of the connecting shaft.

[0032] Further, the connecting shaft is of a hollow shaft structure.

[0033] Further, the first bearing unit includes: a first outer ring 5, a second outer ring 6, a first inner ring 7, a first row of steel balls 8, a second row of steel balls 9, a first cage 10, a second cage 11, a first seal ring 12 and a second seal ring 13; the first inner ring 7 has a double-raceway structure, the inner diameter of the first inner ring 7 is in mating connection with the outer diameter of the lower half section 3 of the connecting shaft, the first outer ring 5 and the second outer ring 6 are respectively arranged on the outside of the first inner ring 7 from bottom to top, the first cage 10 and the second cage 11 are respectively installed between the first inner ring 7 and the first outer ring 5 and between the first inner ring 7 and the second outer ring 6, the first row of steel balls 8 and the second row of steel balls 9 are respectively installed in the pocket holes of the first cage 10 and the second cage 11, the first seal ring 12 is arranged between the first inner ring 7 and the first outer ring 5 close to the lower end face direction of the first bearing unit, and the second seal ring 13 is arranged between the first inner ring 7 and the second outer ring 6 close to the other end face direction of the first bearing unit;

[0034] Further, the first bearing unit further includes an opposed wave spring 24;

[0035] Further, the opposed wave springs 24 are respectively arranged between the first inner ring 7 and the first outer ring 5 in the direction opposite to the first seal ring 12 and between the first inner ring 7 and the second outer ring 6 in the direction opposite to the second seal ring 13;

[0036] The opposed wave spring 24 serves as a preloading structure of the first bearing unit and provides a preloading force between the double-row angular contact ball bearings of the first bearing unit.

[0037] Further, the outer diameter in the direction of the outer end face of the second outer ring 6 is provided with a horizontally extending platform, and a connecting hole 6.1 is opened on the horizontally extending platform for connecting with an external component through a connecting piece.

[0038] Further, the second bearing unit includes: a third outer ring 14, a third inner ring 15, a third row of steel balls 16, a third cage 17 and a third seal ring 18; the inner diameter of the third inner ring 15 is in mating connection with the outer diameter of the upper half section 4 of the connecting shaft, the third cage 17 is installed between the third inner ring 15 and the third outer ring 14, the third row of steel balls 16 is installed in the pocket hole of the third cage 17, and the third seal ring 18 is arranged between the third inner ring 15 and the third outer ring 14 of the second bearing unit close to the lower end direction of the upper half section of the connecting shaft;

[0039] Further, the outer diameter of the third outer ring 14 is provided with a bent extension 14.1, and the inner diameter of the bent extension 14.1 is in mating connection with the outer diameter of the third bearing unit; a connecting hole is opened in the bent extension 14.1, which plays a role in bearing the positioning preloading of the second and third bearing units.

[0040] Further, the third bearing unit includes: a fourth outer ring 19, a fourth inner ring 20, a fourth row of steel balls 21, a fourth cage 22 and a fourth sealing ring 23; the inner diameter of the fourth inner ring 20 is in fit connection with the outer diameter of the upper half section 4 of the connecting shaft and is concentrically and closely arranged with the third inner ring 15, the fourth cage 22 is installed between the fourth inner ring 20 and the fourth outer ring 19, the fourth row of steel balls 21 is installed in the pocket holes of the fourth cage 22, and the fourth sealing ring 23 is arranged between the fourth inner ring 20 and the fourth outer ring 19 near the outer end face direction of the third bearing unit.

[0041] During operation, the lower half of the integral combined bearing rotates around the first axis 1, and the upper half of the integral combined bearing rotates around the second axis 2, forming a double-rotating axis structure.

[0042] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. Air compressor combined seal bearing, comprising: The first bearing unit, the second bearing unit, and the third bearing unit; the Three bearing units form an integral combined bearing; the integral combined bearing is provided with the first bearing unit, the second bearing unit, and the third bearing unit in sequence from bottom to top. The three bearing units are jointly connected to a connecting shaft. The first bearing unit and the lower half of the connecting shaft form the lower half of the integral combined bearing; the second bearing unit, the third bearing unit, and the upper half of the connecting shaft form the upper half of the integral combined bearing; The first bearing unit includes: a first outer ring, a second outer ring, a first inner ring, a first row of steel balls, a second row of steel balls, a first cage, a second cage, a first seal ring, and a second seal ring; the first inner ring has a double raceway structure. The inner diameter of the first inner ring is in mating connection with the outer diameter of the lower half of the connecting shaft. The first outer ring and the second outer ring are respectively provided outside the first inner ring from bottom to top. The first cage and the second cage are respectively installed between the first inner ring and the first outer ring, and between the first inner ring and the second outer ring. The first row of steel balls and the second row of steel balls are respectively installed in the pocket holes of the first cage and the second cage. The first seal ring is arranged between the first inner ring and the first outer ring near the lower end face direction of the first bearing unit, and the second seal ring is arranged between the first inner ring and the second outer ring near the other end face direction of the first bearing unit; The first bearing unit further includes an opposed wave spring; the opposed wave springs are respectively arranged between the first inner ring and the first outer ring in the direction opposite to the first seal ring, and between the first inner ring and the second outer ring in the direction opposite to the second seal ring; The second bearing unit includes: a third outer ring, a third inner ring, a third row of steel balls, a third cage, and a third seal ring; the inner diameter of the third inner ring is in mating connection with the outer diameter of the upper half of the connecting shaft. The third cage is installed between the third inner ring and the third outer ring. The third row of steel balls is installed in the pocket hole of the third cage. The third seal ring is arranged between the third inner ring and the third outer ring near the lower end direction of the upper half of the connecting shaft of the second bearing unit; The third bearing unit includes: a fourth outer ring, a fourth inner ring, a fourth row of steel balls, a fourth cage, and a fourth seal ring; the inner diameter of the fourth inner ring is in mating connection with the outer diameter of the upper half of the connecting shaft and is concentrically and fittingly arranged with the third inner ring. The fourth cage is installed between the fourth inner ring and the fourth outer ring. The fourth row of steel balls is installed in the pocket hole of the fourth cage. The fourth seal ring is arranged between the fourth inner ring and the fourth outer ring near the outer end face direction of the third bearing unit.

2. The combined seal bearing of an air compressor according to claim 1, characterized in that: The axis of the lower half of the integral combined bearing is the first axis, and the axis of the upper half of the integral combined bearing is the second axis. An inclination angle is provided between the first axis and the second axis.

3. The combined sealed bearing of an air compressor according to claim 1, characterized in that: The upper half and the lower half of the connecting shaft are of an integral special-shaped structure. The outer diameter of the lower half is larger than the outer diameter of the upper half, and the upper half is inclined relative to the lower half.

4. The combined seal bearing of an air compressor according to claim 1, wherein: The second bearing unit and the third bearing unit penetrate through the upper half of the connecting shaft concentrically.

5. The combined seal bearing of an air compressor according to claim 1, wherein: The outer diameter of the third outer ring is provided with a bent extension portion, and the inner diameter of the bent extension portion is in mating connection with the outer diameter of the third bearing unit; a connection hole is provided in the bent extension portion.

6. The combined sealed bearing of an air compressor according to claim 2, wherein: The lower half of the integral combined bearing rotates around the first axis, and the upper half of the integral combined bearing rotates around the second axis, forming a double-rotating axis structure.

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