Self-balancing tilting-pad thrust bearing

Abstract

The invention discloses a self-balancing tilting-pad thrust bearing, and relates to the field of sliding bearing design. In order to solve the problems that when an existing thrust bearing is applied to the working condition that a mechanical rotor rotates at a high speed, the axis of the rotor is likely to deflect due to machining quality, self vibration and the like, then a bearing bush of the thrust bearing is stressed unevenly, unbalance loading is generated, and the service life of the thrust bearing is shortened. A double-layer balance block structure is adopted to automatically adjust the stress state of the thrust pads, so that each thrust pad is in uniform contact with the thrust disc, uniform stress among the thrust pads is realized, and the dynamic stability of a mechanical rotating system is improved; the thrust bearing structure can automatically adjust the problem of unbalanced stress between tilting pads of a sliding thrust bearing caused by manufacturing errors, assembly errors and stress states, the reliability and maintainability of the thrust bearing are improved, and the service life of the thrust bearing is prolonged. The invention is suitable for the technical field of thrust bearings.

Description

Technical Field

[0001] The invention relates to the field of sliding bearing design, and in particular to a self-balancing tilting pad thrust bearing. Background Art

[0002] Bearings are a crucial component in modern mechanical equipment. Their primary function is to support rotating parts, reduce friction during movement, and ensure rotational accuracy. Bearings can be categorized as sliding bearings and rolling bearings based on their contact pattern, and as radial bearings and thrust bearings based on the direction of their load-bearing capacity. Thrust bearings are used to withstand the axial thrust generated by the mechanical rotor during rotation. Currently, mechanical rotors are developing toward high and ultra-high speeds. Due to factors such as machining quality and inherent vibration, the rotor axis may deviate. This can cause uneven force on the thrust bearing pads, resulting in eccentric loading, increased wear on the thrust bearing, and increased vibration in the mechanical rotor system. In severe cases, this can lead to failure of the entire mechanical device. Furthermore, thrust bearings are difficult to replace and repair, requiring the entire mechanical system to be interrupted for repair, severely impacting work efficiency.

[0003] In summary, when existing thrust bearings are used in conditions where a mechanical rotor rotates at high speed, the rotor axis may deviate due to reasons such as processing quality and its own vibration, which may cause uneven force on the thrust bearing bushing, resulting in eccentric load, and thus shortening the service life of the thrust bearing. Summary of the Invention

[0004] The present invention proposes a self-balancing tilting pad thrust bearing to solve the problem that when existing thrust bearings are used in conditions where a mechanical rotor rotates at high speed, the rotor may become tilted due to reasons such as processing quality and its own vibration, which may cause uneven force on the thrust bearing bushings, resulting in eccentric load and shortening the service life of the thrust bearing.

[0005] A self-balancing tilting pad thrust bearing of the present invention comprises a collar 1, an oil injection pipe 2, a lower balancing block 3, an upper balancing block assembly 4, a thrust pad 5, a positioning screw 7, a fastening screw 8, a positioning pin 9 and a pin 10; There are n lower balancing blocks 3 evenly arranged inside the annular groove of the collar 1, where n is a positive integer, and the center of the bottom surface of each lower balancing block 3 is fixedly connected to the bottom surface of the annular groove of the collar 1 through a pin 10. There is a gap between every two lower balancing blocks 3 inside the annular groove of the collar 1, and a through hole is machined at the outer surface of the collar 1 corresponding to the gap, and an injection pipe 2 is arranged inside the through hole, and a fixing plate is provided at the end of the injection pipe 2, and a fastening screw 8 is provided at each end of the end surface of the fixing plate. A slide groove is machined at each end of the upper surface of each lower balancing block 3, and an upper balancing block assembly 4 is provided between the upper surfaces of every two lower balancing blocks 3 inside the annular groove of the collar 1, and the upper surface of the upper balancing block assembly 4 A positioning groove is machined in the middle of the large diameter edge, and a positioning screw 7 is provided between every two through holes on the outer surface of the collar 1. The positioning screw 7 is matched with the positioning groove on the upper balancing block assembly 4. A thrust pad 5 is provided on the upper surface of each upper balancing block assembly 4. A positioning pin 9 is respectively provided at the center of the inner curved surface and the outer curved surface of the thrust pad 5. Limiting grooves are evenly machined along the circumferential direction at the large diameter edge and the small diameter edge of the upper surface of the collar 1, and the positioning pin 9 on the inner curved surface of the thrust pad 5 is matched with the limiting groove at the small diameter edge of the upper surface of the collar 1. The positioning pin 9 on the outer curved surface of the thrust pad 5 is matched with the limiting groove at the large diameter edge of the upper surface of the collar 1. Furthermore, an adjustment ring 6 is provided on the bottom surface of the collar 1; Furthermore, the thickness of the adjustment ring 6 is 0.1 mm to 5 mm; Furthermore, the slide grooves at the opposite ends of the upper surfaces of each of the two lower balancing blocks 3 form a fan-shaped groove, and the upper balancing block assembly 4 is arranged inside the fan-shaped groove, and the upper balancing block assembly 4 is slidably connected to the inside of the fan-shaped groove; Furthermore, the upper balancing block assembly 4 is slidably connected to the thrust pad 5; Furthermore, the thrust pad 5 includes a thrust pad 5-1 and a support block 5-2; a groove is machined at the center of the bottom surface of the thrust pad 5-1, and the support block 5-2 is embedded in the groove; Furthermore, the upper balancing weight assembly 4 includes an upper balancing weight 4-1 and an upper balancing weight support block 4-2; a mounting groove is machined at the center of the upper surface of the upper balancing weight 4-1, and the upper balancing weight support block 4-2 is arranged inside the mounting groove; Furthermore, an oil hole is machined at the center of the inner bottom surface of the mounting groove on the upper balancing weight 4-1; Furthermore, the material of the thrust pad 5 is Babbitt alloy; the number n of the lower balancing blocks 3 is 8≤n≤10; Furthermore, the fuel injection pipe 2 is slidably connected to the inner wall of the through hole on the outer circumferential surface of the collar 1 .

[0006] Compared with the prior art, the present invention has the following beneficial effects: The present invention overcomes the shortcomings of the prior art and adopts a double-layer balancing block structure to automatically adjust the stress state of the thrust pad, so that each thrust pad contacts the thrust plate evenly, thereby achieving uniform stress between the thrust pads and improving the dynamic stability of the mechanical rotating system; the thrust bearing structure can automatically adjust the problem of uneven stress between the tilting pads of the sliding thrust bearing caused by manufacturing errors, assembly errors, and stress states, thereby improving the reliability and maintainability of the thrust bearing and extending its service life; the lubrication method of the thrust bearing is different from that of the traditional thrust bearing. The thrust bearing adopts oil spray lubrication, while the traditional thrust bearing usually adopts oil immersion lubrication. Compared with the two, the thrust bearing has the advantages of high working efficiency and small lubrication flow; this type of thrust bearing has strong automatic adjustment ability, relatively simple structure, easy processing, installation, and maintenance, can operate reliably for a long time, and has the conditions for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a three-dimensional exploded view of a self-balancing tilting pad thrust bearing according to the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of a self-balancing tilting pad thrust bearing according to the present invention; Figure 3 yes Figure 2 AA cross-sectional view of a self-balancing tilting pad thrust bearing according to the present invention; Figure 4 yes Figure 2 A self-balancing tilting pad thrust bearing BB cross-sectional view of the present invention; Figure 5 It is a front view and a side sectional view of a thrust pad in a self-balancing tilting pad thrust bearing according to the present invention; Figure 6 It is a main view and CC sectional view of an upper balancing block assembly in a self-balancing tilting pad thrust bearing described in the present invention. DETAILED DESCRIPTION

[0008] Specific implementation method 1: Combination Figures 1 to 4 This embodiment describes a self-balancing tilting pad thrust bearing, which comprises a collar 1, an oil injection pipe 2, a lower balancing weight 3, an upper balancing weight assembly 4, a thrust pad 5, a positioning screw 7, a fastening screw 8, a positioning pin 9, and a pin 10; There are n lower balancing blocks 3 evenly arranged inside the annular groove of the collar 1, where n is a positive integer, and the center of the bottom surface of each lower balancing block 3 is fixedly connected to the bottom surface of the annular groove of the collar 1 through a pin 10. There is a gap between every two lower balancing blocks 3 inside the annular groove of the collar 1, and a through hole is machined at the outer surface of the collar 1 corresponding to the gap, and an injection pipe 2 is arranged inside the through hole, and a fixing plate is provided at the end of the injection pipe 2, and a fastening screw 8 is provided at each end of the end surface of the fixing plate. A slide groove is machined at each end of the upper surface of each lower balancing block 3, and an upper balancing block assembly 4 is provided between the upper surfaces of every two lower balancing blocks 3 inside the annular groove of the collar 1, and the upper surface of the upper balancing block assembly 4 A positioning groove is machined in the middle of the large diameter edge, and a positioning screw 7 is provided between every two through holes on the outer surface of the collar 1. The positioning screw 7 is matched with the positioning groove on the upper balancing block assembly 4. A thrust pad 5 is provided on the upper surface of each upper balancing block assembly 4. A positioning pin 9 is respectively provided at the center of the inner curved surface and the outer curved surface of the thrust pad 5. Limiting grooves are evenly machined along the circumferential direction at the large diameter edge and the small diameter edge of the upper surface of the collar 1, and the positioning pin 9 on the inner curved surface of the thrust pad 5 is matched with the limiting groove at the small diameter edge of the upper surface of the collar 1. The positioning pin 9 on the outer curved surface of the thrust pad 5 is matched with the limiting groove at the large diameter edge of the upper surface of the collar 1. This specific implementation method adopts a double-layer balancing block structure to automatically adjust the stress state of the thrust pad, so that each thrust pad contacts the thrust plate evenly, thereby achieving uniform stress between the thrust pads and improving the dynamic stability of the mechanical rotating system; this thrust bearing structure can automatically adjust the problem of uneven stress between the tilting pads of the sliding thrust bearing caused by manufacturing errors, assembly errors, and stress states, thereby improving the reliability and maintainability of the thrust bearing and extending its service life; the lubrication method of this thrust bearing is different from that of traditional thrust bearings. This thrust bearing adopts oil spray lubrication, while traditional thrust bearings usually adopt oil immersion lubrication. Compared with the two, this thrust bearing has the advantages of high working efficiency and small lubrication flow; this type of thrust bearing has strong automatic adjustment ability, relatively simple structure, easy processing, installation, and maintenance, can operate reliably for a long time, and has the conditions for large-scale promotion and application.

[0009] Specific implementation method 2: Combination Figures 1 to 4 This embodiment is described as a further limitation of the thrust bearing described in the first embodiment. In the self-balancing tilting pad thrust bearing described in this embodiment, an adjustment ring 6 is provided on the bottom surface of the collar 1. In this specific embodiment, an adjusting ring 6 is provided on the bottom surface of the collar 1 , and the installation gap is adjusted by adjusting the thickness of the adjusting ring 6 during the installation process.

[0010] Specific implementation method three: Combination Figures 1 to 4This embodiment is described as a further limitation of the thrust bearing described in the second embodiment. In the self-balancing tilting pad thrust bearing described in this embodiment, the thickness of the adjustment ring 6 is 0.1 mm to 5 mm.

[0011] Specific implementation method four: Combination Figures 1 to 4 This embodiment is described as further limiting the thrust bearing described in the first embodiment. In the self-balancing tilting pad thrust bearing described in this embodiment, the slide grooves at opposite ends of the upper surfaces of each of the two lower balancing blocks 3 form a fan-shaped groove, and the upper balancing block assembly 4 is disposed within the fan-shaped groove, and the upper balancing block assembly 4 is slidably connected to the interior of the fan-shaped groove. In this specific embodiment, the lower contact surface of the lower balancing block 3 is a cylindrical surface, wherein the lower surface is in contact with the collar, and the upper surface is in contact with the upper balancing block assembly 4. The use of a cylindrical surface can increase the flexible swinging of the lower balancing block under stress and improve its adjustment ability. At the same time, a pin 10 is installed between the lower balancing block 3 and the collar 1. The pin 10 is matched with the collar 1 with a small gap and with the lower balancing block 3 with a larger gap to ensure that the balancing block can swing flexibly under stress.

[0012] Specific implementation method five: Combination Figures 1 to 4 This embodiment is described as a further limitation of the thrust bearing described in the first embodiment. In this embodiment, a self-balancing tilting pad thrust bearing is described, in which the upper balancing block assembly 4 is slidably connected to the thrust pad 5 .

[0013] Specific implementation method six: combination Figures 1 to 4 This embodiment is described. This embodiment further defines the thrust bearing described in the fifth embodiment. In the self-balancing tilting pad thrust bearing described in this embodiment, the upper balancing mass assembly 4 includes an upper balancing mass 4-1 and an upper balancing mass support mass 4-2. A mounting groove is machined at the center of the upper surface of the upper balancing mass 4-1, and the upper balancing mass support mass 4-2 is disposed within the mounting groove. In this specific embodiment, the upper and lower contact surfaces of the upper balancing block assembly 4 are both flat and are required to have a high degree of smoothness to ensure a small friction coefficient, and the height difference between each balancing block assembly is required to be strictly limited to reduce the height error of each thrust pad 5 after assembly. The upper balancing block assembly 4 and the collar 1 are positioned by a positioning screw 7, which is installed on the collar, and the protruding end of the positioning screw 7 is located in the positioning groove of the upper balancing block assembly 4, which plays a role in circumferential positioning.

[0014] Specific implementation method seven: combination Figures 1 to 4This embodiment is described. This embodiment further limits the thrust bearing described in the fifth embodiment. In this embodiment, a self-balancing tilting pad thrust bearing is described. The thrust pad 5 includes a thrust pad 5-1 and a support block 5-2. A groove is machined at the center of the bottom surface of the thrust pad 5-1, and the support block 5-2 is embedded in the groove. In this specific embodiment, the bottom surface of the support block 5-2 is a spherical surface, so as to facilitate contact with the upper balance block assembly 4. The spherical surface helps to adjust the force state of the thrust pad 5. The pad is swung along the spherical surface to transmit force to the balance block, and the force is evenly distributed among the thrust pads 5 through the lever balance principle, thereby achieving uniform force on the thrust bearing.

[0015] Specific implementation method eight: combination Figures 1 to 4 This embodiment is described as a further limitation of the thrust bearing described in specific embodiment 6. In this embodiment, a self-balancing tilting pad thrust bearing is described, and an oil hole is machined at the center of the inner bottom surface of the mounting groove on the upper balancing block 4-1.

[0016] Specific implementation method nine: Combination Figures 1 to 4 This embodiment is described as a further limitation of the thrust bearing described in the first embodiment. In this embodiment, a self-balancing tilting pad thrust bearing is described, and the material of the thrust pad 5 is Babbitt alloy; the number n of the lower balancing blocks 3 is 8≤n≤10.

[0017] Specific implementation method ten: Combination Figures 1 to 4 This embodiment is described as a further limitation of the thrust bearing described in the first embodiment. In the self-balancing tilting pad thrust bearing described in this embodiment, the oil injection pipe 2 is slidably connected to the inner wall of the through hole on the outer circumferential surface of the ring 1.

Claims

1. A self-balancing tilting pad thrust bearing, characterized in that: It includes a collar (1), an oil injection pipe (2), a lower balancing block (3), an upper balancing block assembly (4), a thrust pad (5), a positioning screw (7), a fastening screw (8), a positioning pin (9) and a pin (10); N lower balancing blocks (3) are evenly arranged inside the annular groove of the collar (1), where n is a positive integer, and the center of the bottom surface of each lower balancing block (3) is fixedly connected to the bottom surface of the annular groove of the collar (1) through a pin (10). A gap is provided between every two lower balancing blocks (3) inside the annular groove of the collar (1), and a through hole is processed at the outer surface of the collar (1) corresponding to the gap, and an injection pipe (2) is provided inside the through hole. A fixing plate is provided at the end of the injection pipe (2), and a fastening screw (8) is provided at each end of the end surface of the fixing plate. A sliding groove is processed at each end of the upper surface of each lower balancing block (3), and an upper balancing block assembly (4) is provided between the upper surfaces of every two lower balancing blocks (3) inside the annular groove of the collar (1). The upper surface of the upper balancing block assembly (4) is provided with a fixed plate. A positioning groove is machined in the middle of the large diameter edge of the surface, and a positioning screw (7) is provided between each two through holes on the outer surface of the collar (1), and the positioning screw (7) is matched with the positioning groove on the upper balance block assembly (4). A thrust pad (5) is provided on the upper surface of each upper balance block assembly (4), and a positioning pin (9) is provided at the center of the inner curved surface and the outer curved surface of the thrust pad (5). Limiting grooves are uniformly machined along the circumferential direction at the large diameter edge and the small diameter edge of the upper surface of the collar (1), and the positioning pin (9) on the inner curved surface of the thrust pad (5) is matched with the limiting groove at the small diameter edge of the upper surface of the collar (1), and the positioning pin (9) on the outer curved surface of the thrust pad (5) is matched with the limiting groove at the large diameter edge of the upper surface of the collar (1).

2. The self-balancing tilting pad thrust bearing according to claim 1, characterized in that: An adjusting ring (6) is provided on the bottom surface of the collar (1).

3. The self-balancing tilting pad thrust bearing according to claim 2, characterized in that: The thickness of the adjustment ring (6) is 0.1 mm to 5 mm.

4. The self-balancing tilting pad thrust bearing according to claim 1, characterized in that: The slide grooves at the opposite ends of the upper surfaces of each of the two lower balancing blocks (3) form a fan-shaped groove, and the upper balancing block assembly (4) is arranged inside the fan-shaped groove, and the upper balancing block assembly (4) is slidably connected to the inside of the fan-shaped groove.

5. The self-balancing tilting pad thrust bearing according to claim 1, characterized in that: The upper balancing block assembly (4) is slidably connected to the thrust pad (5).

6. The self-balancing tilting pad thrust bearing according to claim 5, characterized in that: The upper balancing block assembly (4) comprises an upper balancing block (4-1) and an upper balancing block support block (4-2); a mounting groove is machined at the center of the upper surface of the upper balancing block (4-1), and the upper balancing block support block (4-2) is arranged inside the mounting groove.

7. The self-balancing tilting pad thrust bearing according to claim 5, characterized in that: The thrust washer (5) comprises a thrust washer (5-1) and a support block (5-2); a groove is machined at the center of the bottom surface of the thrust washer (5-1), and the support block (5-2) is embedded in the groove.

8. The self-balancing tilting pad thrust bearing according to claim 6, characterized in that: An oil hole is machined at the center of the inner bottom surface of the mounting groove on the upper balancing block (4-1).

9. The self-balancing tilting pad thrust bearing according to claim 1, characterized in that: The material of the thrust pad (5) is Babbitt alloy; the number n of the lower balancing blocks (3) is 8≤n≤10.

10. The self-balancing tilting pad thrust bearing according to claim 1, characterized in that: The oil injection pipe (2) is slidably connected to the inner wall of the through hole on the outer circumferential surface of the collar (1).

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