Resistance increasing type squeeze film damper with dynamic expansion ring adjusting mechanism

Abstract

The invention relates to a resistance-increasing extrusion oil film damper with a dynamic expansion ring adjusting mechanism, which comprises a damper outer ring, a damper inner ring and two sealing expansion rings positioned between the damper outer ring and the damper inner ring, and an oil film positioned between the two sealing expansion rings is formed between the damper outer ring and the damper inner ring. An oil supply hole communicated with the oil film is formed in the damper outer ring, an annular expansion ring groove is formed in the outer ring of the damper inner ring, the sealing expansion ring is arranged in the expansion ring groove and moves in the expansion ring groove in the axial direction, and under the low-frequency working condition, the sealing expansion ring can be adjusted to the inner side of the expansion ring groove, so that the sealing effect is achieved. The extrusion effect of the oil film is improved, so that the oil film pressure is improved, and damping is increased; under the high-frequency working condition, the lubricating oil supplementing capacity of a low-pressure area is improved by enlarging the circumferential circulation area of an oil film, and formation of steam holes is effectively restrained. The function prolongs the service life of the equipment, and avoids performance reduction and equipment damage caused by the steam cavity.

Description

Technical Field

[0001] The invention relates to the technical field of squeeze film dampers, in particular to a resistance-increasing squeeze film damper with a dynamic expansion ring adjustment mechanism. Background Art

[0002] Squeeze Film Damper (SFD) is one of the important components used to suppress rotor vibration, such as described in the following two patents: CN112096783A, a squeeze film damper with a new outer ring structure, and CN109139796A, a fixed-end sealed squeeze film damper. The squeeze film damper is generally composed of a damper outer ring, a damper inner ring, etc. The damper inner ring is elastically supported by an elastic squirrel cage, and the rotating shaft is connected to the inner ring of the damper inner ring through a bearing. An oil film is formed between the damper outer ring and the damper inner ring, and oil supply is achieved by opening an oil supply hole in the damper outer ring. The oil film is used to achieve vibration reduction of the radial movement of the damper inner ring.

[0003] The sealing expansion ring type squeeze film damper has sealing expansion rings at both ends. Its main function is to reduce the axial flow of lubricating oil and reduce the intake of external air, thereby increasing the damping coefficient of the squeeze film damper. Figure 1 As shown in the figure, the expansion ring allows the lubricating oil to flow out only through the ring's gap. The fluid outflow channel is significantly smaller than that of an open squeeze film damper without an expansion ring, thereby reducing the axial flow of lubricating oil and ensuring full oil extrusion. Therefore, the damping performance of a sealed expansion ring squeeze film damper is significantly improved compared to an open squeeze film damper.

[0004] During the operation of the squeeze film damper, the oil film pressure is alternately distributed between high pressure and low pressure in the circumferential direction. When the working condition of the sealed expansion ring type squeeze film damper reaches a certain level, the pressure in the low-pressure area of ​​the oil film will be lower than the saturated vapor pressure of the lubricating oil, and the lubricating oil will change from liquid to gas. This phenomenon is called a vapor cavity. The vapor cavity will destroy the integrity of the oil film, reduce the oil film damping of the squeeze film damper, and affect the vibration reduction effect of the squeeze film damper. This patent aims to solve the problem that the traditional sealed expansion ring type squeeze film damper has more serious vapor cavitation under high working conditions and lower oil film damping under low working conditions. By adding an expansion ring axial position adjustment structure to the traditional sealed expansion ring type squeeze film damper, the generation of vapor cavitation is reduced, and the oil film damping under low working conditions is increased, thereby improving the vibration reduction effect of the damper. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a resistance-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism. The core of the invention is to achieve real-time axial adjustment of the expansion ring during the operation of the damper through the coordinated action of the axial drive rod, the axial drive ring and the dynamic regulator, thereby optimizing the oil film pressure distribution, improving the damping and suppressing the formation of steam pockets.

[0006] The present invention is achieved through the following technical solution, which provides a resistance-enhancing squeeze oil film damper with a dynamic expansion ring adjustment mechanism, including a damper outer ring, a damper inner ring and two sealing expansion rings located between the damper outer ring and the damper inner ring. An oil film is formed between the damper outer ring and the damper inner ring and located between the two sealing expansion rings. The damper outer ring is provided with an oil supply hole connected to the oil film, and the outer ring of the damper inner ring is provided with an annular expansion ring groove. The sealing expansion ring is arranged in the expansion ring groove, and also includes a dynamic expansion ring adjustment mechanism for driving the sealing expansion ring to move axially in the expansion ring groove.

[0007] The sealing ring in this scheme can move axially in the expansion ring groove. At low precession frequency, the sealing ring moves inward, the distance between the two sealing rings decreases, and the local pressure is increased to improve the damping performance; at high precession frequency, the sealing ring moves outward, the distance between the two sealing rings increases, the circumferential flow channel of the oil film is expanded, and oil is replenished to the low-pressure area through the circumferential connection of the expansion ring groove to suppress the formation of steam pockets.

[0008] As an optimization, the dynamic expansion ring adjustment mechanism includes multiple axial drive rods fixed to the outer ring of the sealing expansion ring and an axial drive ring rotatably connected to the outer ring of the damper. The inner ring of the axial drive ring is provided with an oblique groove. The outer ring of the damper is provided with an axial guide groove for the axial drive rods to pass through. The ends of the axial drive rods are inserted into the oblique groove. In this solution, when the axial drive ring rotates, the oblique groove forces the axial drive rods to move radially along the outer ring of the damper, thereby driving the sealing expansion ring to achieve radial movement.

[0009] As an optimization, the dynamic expansion ring adjustment mechanism further includes a dynamic regulator that drives the two axial drive rings to rotate together. In this solution, the dynamic regulator drives the two axial drive rings to rotate together, thereby achieving synchronous adjustment of the two sealing expansion rings.

[0010] As an optimization, the multiple axial drive rods of the outer ring of the sealing ring are evenly distributed around the circumference. The multi-point synchronous drive prevents the sealing ring from deflecting, and the evenly distributed support structure of the axial drive ring is combined to achieve movement stability.

[0011] As an optimization, the axial drive ring is rotatably connected to the damper outer ring via two rings of metal balls. Two ball grooves are defined on the inner ring of the axial drive ring and the outer ring of the damper. In this solution, the ball grooves enable the metal balls to roll, thereby achieving a rotatable connection between the axial drive ring and the damper outer ring.

[0012] As an optimization, the axial guide groove is a long groove and extends radially along the outer ring of the damper, thereby realizing the movement of the axial drive rod.

[0013] As an optimization, the cross-sections of the sealing ring and the ring groove of the sealing ring are both rectangular, and the cross-section width of the ring groove of the sealing ring is 1.05-1.2 times the cross-section width of the sealing ring, thereby realizing radial movement space for the sealing ring.

[0014] As an optimization, the outer ring of the inner ring of the damper is provided with an annular oil supply groove, so as to facilitate the rapid movement of lubricating oil from the oil supply hole along the circumferential direction.

[0015] As an optimization, the two sealing rings move synchronously in opposite directions.

[0016] As an optimization, when the squeeze film damper has a low precession frequency, the sealing ring moves inward, and when the precession frequency is high, the sealing ring moves outward.

[0017] The beneficial effects of the present invention are: Under low-frequency working conditions, this patent can improve the extrusion effect of the oil film by adjusting the sealing expansion ring to the inside of the expansion ring groove, thereby increasing the oil film pressure and increasing the damping.

[0018] This patented technology expands the circumferential oil film flow area under high-frequency operating conditions, increasing the lubricating oil replenishment capacity in low-pressure areas and effectively suppressing the formation of steam pockets. This feature extends the service life of the equipment and avoids performance degradation and equipment damage caused by steam pockets.

[0019] This patented design utilizes an axial drive rod and oblique grooves to precisely control the axial position of the sealing ring, ensuring stable movement within the designed range. Compared to traditional sealing rings, which are prone to uncontrolled axial displacement or even tilting due to vibration or pressure fluctuations, this design significantly improves sealing reliability, reduces the risk of oil leakage, and ensures stable system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram of the present invention; Figure 2 For the present invention Figure 1 Middle AA plane section view; Figure 3 For the present invention Figure 2 Middle BB plane cross-sectional view; Figure 4 Another aspect of the present invention Figure 2 Middle BB plane cross-sectional view; Figure 5 For the present invention Figure 3 Schematic diagram of the inner side of the central axial drive ring; Figure 6 For the present invention Figure 3 Schematic diagram of the outer side of the middle damper outer ring; Figure 7 Schematic diagram of the model size and lubricating oil parameters of the present invention; Figure 8 The oil film pressure cloud diagram of the sealing expansion ring of the present invention when it is adjusted to different axial positions; Figure 9 Schematic diagram of damping when the sealing expansion ring of the present invention is adjusted to different axial positions; Figure 10 The steam cavity cloud diagram of the sealing expansion ring of the present invention when it is adjusted to different axial positions; As shown in the figure: 1. Damper outer ring, 2. Damper inner ring, 3. Bearing, 4. Rotating shaft, 5. Oil supply hole, 6. Oil film, 7. Sealing ring, 8. Oil supply groove, 9. Axial drive rod, 10. Axial drive ring, 11. Metal ball, 12. Axial guide groove, 13. Oblique groove, 14. Ball groove. DETAILED DESCRIPTION

[0021] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0022] like Figures 1 to 10 As shown, the resistance-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism of the present invention includes a damper outer ring 1, a damper inner ring 2 and two sealing expansion rings 7 located between the damper outer ring 1 and the damper inner ring 2.

[0023] The outer ring 1 of the damper is fixed, and the inner ring 2 of the damper is supported by an elastic squirrel cage structure, so that the inner ring 2 of the damper can achieve radial elastic movement. The inner ring 2 of the damper is connected to the rotating shaft 4 through the bearing 3 to support the rotating shaft 4.

[0024] The outer ring of the damper inner ring 2 is provided with an expansion ring groove for accommodating the sealing expansion ring 7. The expansion ring groove is annular, and the thickness of the expansion ring groove is slightly larger than the thickness of the sealing expansion ring 7. The cross-section of the sealing expansion ring 7 and the cross-section of the expansion ring groove are both rectangular, and in this embodiment, the cross-sectional width of the expansion ring groove is 1.05-1.2 times the cross-sectional width of the sealing expansion ring 7, so that the sealing expansion ring 7 can achieve a certain radial movement in the expansion ring groove.

[0025] The elastic force of the sealing expansion ring 7 forces it to adhere to the inner ring of the damper outer ring 1. An oil film 6 is formed between the damper outer ring 1 and the damper inner ring 2, located between the two sealing expansion rings 7. The damper outer ring 1 is provided with an oil supply hole 5 connected to the oil film 6. The installation of the sealing expansion ring 7 significantly reduces the oil outflow channel compared to an open squeeze film damper without a sealing expansion ring structure, thereby reducing the axial flow of lubricating oil, ensuring sufficient oil extrusion and improving the damping of the squeeze film damper.

[0026] The outer ring of the damper inner ring 2 is provided with an annular oil supply groove 8, which is located in the middle of the oil film 6 and can realize the rapid replenishment flow of lubricating oil. In this embodiment, the cross-section of the oil supply groove 8 is rectangular.

[0027] The device also includes a dynamic expansion ring adjustment mechanism that drives the sealing ring 7 to axially move within the ring groove. In this application, the movement direction of the sealing ring 7 is explained as follows: movement of the sealing ring 7 toward the oil film 6 is referred to as inward movement of the sealing ring 7; movement of the sealing ring 7 away from the oil film 6 is referred to as outward movement of the sealing ring 7. In this application, the two sealing rings 7 move synchronously in opposite directions.

[0028] like Figure 3 As shown, the dynamic expansion ring adjustment mechanism includes multiple axial drive rods 9 fixed to the outer ring of the sealing ring 7 and an axial drive ring 10 rotatably connected to the outer ring 1 of the damper. The multiple axial drive rods 9 on the outer ring of the sealing ring 7 are evenly distributed around the circumference. One end of the axial drive rod 9 is fixed to the outer ring of the sealing ring 7. The axial drive rods 9 thus drive the movement of the sealing ring 7.

[0029] The damper outer ring 1 is provided with an axial guide slot 12 for the axial drive rod 9 to pass through. The axial guide slot 12 is an elongated slot extending radially along the damper outer ring 1 , thereby enabling movement of the axial drive rod 9 . The width of the guide slot 12 is equal to the outer diameter of the axial drive rod 9 .

[0030] The axial drive ring 10 is provided with two sealing expansion rings 7 corresponding to each other. In order to realize the rotational connection between the axial drive ring 10 and the damper outer ring 1, the axial drive ring 10 is rotationally connected to the damper outer ring 1 through two circles of metal balls 11. The inner ring of the axial drive ring 10 and the outer ring of the damper outer ring 1 are both provided with two ball grooves 14.

[0031] like Figure 5 As shown, the inner ring of the axial drive ring 10 is provided with an oblique groove 13 , and the end of the axial drive rod 9 is inserted into the oblique groove 13 , so that the movement of the axial drive rod 9 is achieved through the oblique groove 13 .

[0032] The dynamic expansion ring adjustment mechanism also includes a dynamic regulator that drives the two axial drive rings 10 to rotate together. The dynamic regulator can be a motor, a hydraulic motor or other components, as long as it can realize the rotation of the axial drive ring 10.

[0033] The method of using the present invention: At low precession frequency, that is, when the damper inner ring 2 is in low-frequency vibration, the dynamic controller drives the axial drive ring 10 to rotate to a set angle, so that the oblique groove 13 forces the axial drive rod 9 and the sealing ring 7 to move inward, and the distance between the two sealing rings 7 is reduced, thereby increasing the local pressure to improve the damping performance; at high precession frequency, the dynamic controller drives the axial drive ring 10 to rotate in the reverse direction, so that the sealing ring 7 moves outward, and the distance between the two sealing rings 7 is increased, thereby expanding the circumferential flow channel of the oil film, and replenishing oil to the low-pressure area through the circumferential connection of the expansion ring groove to suppress the formation of steam pockets.

[0034] To ensure smooth adjustment, multiple sets of axial drive rods 9 and diagonal grooves 13 are arranged circumferentially. This multi-point synchronous drive prevents deflection of the sealing ring 7, while the uniformly distributed support structure of the axial drive ring 10 ensures stable movement. Through this solution, the patent achieves real-time dynamic adjustment under different operating conditions, resolving the performance shortcomings of traditional dampers caused by the fixed expansion ring.

[0035] In this patent, the sealing ring 7 is designed to be located only in two positions within the ring groove: the innermost and outermost. Both positions provide a normal sealing effect. Only when the engine speed changes significantly—that is, when the damper precession frequency changes from low to high (or vice versa)—will the ring be rapidly pushed from the inside to the outside (or vice versa). The time the ring is not in the sealing position (inside or outside) is extremely short, and any resulting oil leakage is negligible.

[0036] In order to better verify the rationality and effectiveness of the design of the patented drag-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism, ANSYS software was used to simulate the patent with an eccentricity of 0.3. The damper structural parameters and lubricating oil parameters are as follows: Figure 7 shown.

[0037] At a lower precession frequency, taking 150Hz as an example, the simulation results are as follows Figure 8 、 9 When the sealing ring 7 is on the inner side, the oil film pressure is greater and the oil film damping is higher. Therefore, when the sealing ring 7 is adjusted to the inner side at low frequencies, a better vibration reduction effect can be obtained.

[0038] At a higher precession frequency, taking 270Hz as an example, the simulation results are as follows Figure 10When the sealing ring 7 is on the outside, the oil film vapor volume fraction is smaller and the oil film integrity is higher. Therefore, at high frequencies, adjusting the sealing ring 7 to the outside can better suppress steam pockets.

[0039] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by adopting existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical solutions of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A drag-increasing squeeze film damper with a dynamic expansion ring adjustment mechanism, comprising a damper outer ring (1), a damper inner ring (2), and two sealing expansion rings (7) located between the damper outer ring (1) and the damper inner ring (2), an oil film (6) located between the two sealing expansion rings (7) is formed between the damper outer ring (1) and the damper inner ring (2), an oil supply hole (5) connected to the oil film (6) is opened on the damper outer ring (1), and the characteristics are: The outer ring of the damper inner ring (2) is provided with an annular expansion ring groove, the sealing expansion ring (7) is arranged in the expansion ring groove, and also includes a dynamic expansion ring adjustment mechanism for driving the sealing expansion ring (7) to move axially in the expansion ring groove.

2. The drag-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism according to claim 1, characterized in that: The dynamic expansion ring adjustment mechanism includes a plurality of axial drive rods (9) fixed to the outer ring of the sealing expansion ring (7) and an axial drive ring (10) rotatably connected to the outer ring (1) of the damper, the inner ring of the axial drive ring (10) is provided with an oblique groove (13), the outer ring (1) of the damper is provided with an axial guide groove (12) for accommodating the axial drive rod (9) to pass through, and the end of the axial drive rod (9) is inserted into the oblique groove (13).

3. The drag-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism according to claim 2, characterized in that: The dynamic expansion ring adjustment mechanism also includes a dynamic regulator that drives the two axial drive rings (10) to rotate together.

4. The drag-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism according to claim 2, characterized in that: The plurality of axial drive rods (9) on the outer ring of the sealing expansion ring (7) are evenly distributed in the circumferential direction.

5. The drag-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism according to claim 2, characterized in that: The axial drive ring (10) is rotatably connected to the damper outer ring (1) via two circles of metal balls (11), and the inner ring of the axial drive ring (10) and the outer ring of the damper outer ring (1) are both provided with two ball grooves (14).

6. The drag-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism according to claim 2, characterized in that: The axial guide groove (12) is a long groove and extends radially along the damper outer ring (1).

7. The drag-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism according to claim 1, characterized in that: The cross-sections of the sealing expansion ring (7) and the expansion ring groove are both rectangular, and the cross-section width of the expansion ring groove is 1.05-1.2 times the cross-section width of the sealing expansion ring (7).

8. The drag-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism according to claim 1, characterized in that: The outer ring of the damper inner ring (2) is provided with an annular oil supply groove (8).

9. The drag-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism according to claim 1, characterized in that: The two sealing rings (7) move synchronously in opposite directions.

10. The drag-enhancing squeeze film damper with a dynamic expansion ring adjustment mechanism according to claim 1, characterized in that: When the squeeze film damper is in a low precession frequency, the sealing ring (7) moves inward, and when the squeeze film damper is in a high precession frequency, the sealing ring (7) moves outward.

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