Circumferential cavity separation type composite extrusion oil film damper with adjustable oil groove and steam suppression

Abstract

The invention relates to an adjustable oil groove and steam suppression circumferential cavity type combined extrusion oil film damper which comprises a damper outer ring, a damper inner ring and two sealing piston rings located between the damper outer ring and the damper inner ring, and an oil film located between the two sealing piston 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, a plurality of rubber sealing strips distributed in the circumferential direction are installed between the damper outer ring and the damper inner ring, the rubber sealing strips divide the oil film into a plurality of arc-shaped oil film areas, the oil supply hole is communicated with one arc-shaped oil film area, and the oil supply hole is communicated with the other arc-shaped oil film area. According to the first scheme, an elastic sealing head is installed in the middle of a rubber sealing strip, and when the elastic sealing head moves to the bottom of an oil supply groove, the oil supply groove is cut off, and according to the second scheme, a low-pressure oil supplementing hole formed in the outer ring of the damper is formed in each arc-shaped oil film area; and a one-way valve which is opened towards the direction of the arc-shaped oil film area is arranged on the low-pressure oil supplementing hole.

Description

Technical Field

[0001] The invention relates to the technical field of squeeze film dampers, in particular to a circumferentially divided-cavity composite squeeze film damper with adjustable oil groove and steam suppression. Background Art

[0002] The closed squeeze film damper is equipped with end seal structures (sealing 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 13 As shown in the figure, its axial structure, from the center to the sides, consists of the oil supply groove area, the oil film area, and the end seal groove area. The end seals significantly reduce the fluid outflow path compared to an open squeeze film damper without end seals, thereby reducing axial oil flow and ensuring full oil compression. Therefore, the closed squeeze film damper significantly improves damping compared to the open squeeze film damper.

[0003] Traditional dampers are unable to flexibly adjust the pressure distribution of the oil film at different precession frequencies, resulting in low damping performance at low precession frequencies and a significant decrease in damping performance in the event of oil leakage due to a fault. In addition, traditional dampers will have a more serious steam cavity problem under high operating conditions.

[0004] Existing technologies primarily improve damping performance by modifying the end seal structure or adjusting the interface of the seal expansion ring. However, while these methods improve damping, they can also increase structural complexity, and the resulting damping improvement is limited. Furthermore, existing technologies fail to fully consider the flexible adjustment of oil supply requirements at varying precession frequencies, limiting the overall performance improvement of the damper. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a circumferentially divided-cavity composite extrusion oil film damper with adjustable oil groove and steam suppression, which can significantly improve the damping performance, increase the pressure in the high-pressure area, reduce the volume fraction of steam in the oil film, and maintain a certain vibration reduction effect in the event of oil leakage, thereby improving the reliability and stability of the overall system.

[0006] The present invention is achieved through the following technical solution, which provides a circumferentially divided cavity composite extrusion oil film damper with adjustable oil groove and steam suppression, including a damper outer ring, a damper inner ring and two sealing 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 rings. An oil supply hole connected to the oil film is opened on the damper outer ring. A plurality of circumferentially arranged rubber sealing strips are installed between the damper outer ring and the damper inner ring. The rubber sealing strips divide the oil film into a plurality of arc-shaped oil film areas, and the oil supply hole is connected to one of the arc-shaped oil film areas.

[0007] The rubber sealing strip in this solution divides the oil film into multiple arc-shaped zones, increasing the oil film pressure in the high-pressure zone at different precession frequencies, thereby significantly improving damping performance. Furthermore, in the event of a malfunction or oil leak in the oil supply system, the rubber sealing strip still provides a certain damping effect, maintaining the system's basic vibration reduction function and further improving system reliability and safety.

[0008] As an optimization, the number of the rubber sealing strips is 3-7.

[0009] As an optimization, the outer ring of the damper inner ring is provided with an annular oil supply groove, and the middle part of the rubber sealing strip is slidably connected with an elastic sealing head along the radial direction of the damper inner ring. The inner ring of the damper outer ring is provided with a groove, and also includes a driving mechanism for driving the elastic sealing head to move between the groove and the oil supply groove. When the elastic sealing head moves to the bottom of the oil supply groove, the oil supply groove is cut off. In this solution, an elastic sealing head is provided in the oil supply groove area, and the shape of its top end matches the cross-sectional shape of the oil supply groove to achieve efficient sealing. During the operation of the damper, the driving mechanism drives the elastic sealing head to move radially according to the different precession frequencies. When it is at a low precession frequency, the elastic sealing head moves toward the inner ring to cut off the oil supply groove. At this time, multiple arc-shaped oil film areas are circumferentially connected only through the narrow end sealing groove areas at both ends of the damper. Since the lubricating oil flow channels (i.e., oil supply grooves) between each arc-shaped oil film area are blocked by rubber sealing strips, the circumferential flow of lubricating oil along the oil supply grooves is hindered and can only flow circumferentially through the narrow end seal groove area gap. Therefore, the lubricating oil pressure in the squeezed part of the arc-shaped oil film area (i.e., the oil film high-pressure area) is significantly increased, thereby greatly increasing the oil film force and improving damping.

[0010] When the damper operates at a high precession frequency, the elastic sealing head retracts toward the outer ring, and the oil supply grooves resume circumferential connectivity. At this point, multiple arc-shaped oil film areas can be connected via the oil supply grooves. Because the cross-sectional area of ​​the oil supply grooves is much larger than the cross-sectional area of ​​the oil film gaps in the end seal grooves, lubricating oil can flow freely between the multiple arc-shaped oil film areas, ensuring that low-pressure areas receive the appropriate amount of oil replenishment, effectively preventing the formation of steam pockets. This dynamic adjustment mechanism ensures optimal drag enhancement under different operating conditions, enhancing the extrusion effect by closing the oil supply grooves at low frequencies and maintaining the stability of the low-pressure areas of the oil film by opening the oil supply grooves at high frequencies.

[0011] As an optimization, a rectangular sealing head through hole is opened in the middle of the rubber sealing strip, and the elastic sealing head passes through the sealing head through hole. The through hole in this solution realizes the installation of the elastic sealing head.

[0012] As an optimization, the drive mechanism includes a displacement transfer rod radially slidingly connected to the damper outer ring and an electrically controlled actuator that drives the displacement transfer rod in radial motion. The elastic sealing head is fixedly connected to the end of the displacement transfer rod. In this solution, the elastic sealing head is connected to an electric drive controller via the displacement transfer rod, which penetrates the damper outer ring. The electric drive controller controls the telescopic movement of the transfer rod based on external signals.

[0013] As an optimization, the displacement transfer rod is a stepped shaft, the large diameter section of the displacement transfer rod is located in the groove, and the small diameter section of the displacement transfer rod passes through the outer ring of the damper.

[0014] As an optimization, adjacent curved oil film zones are separated by rubber sealing strips. Each curved oil film zone is equipped with a low-pressure oil supply port on the damper's outer ring. Each low-pressure oil supply port is equipped with a check valve that opens toward the curved oil film zone. In this solution, multiple sets of rubber sealing strips divide the complete annular oil film into multiple independent curved oil film zones. Each curved oil film zone forms independent high-pressure and low-pressure zones during dynamic extrusion. Due to the circumferential oil film partitioning, the low-pressure zone of the oil film experiences lower pressure, making it more susceptible to steam cavitation. To further mitigate steam cavitation in the low-pressure zone, two low-pressure oil supply ports are symmetrically positioned along the axial center of the oil film zone, located between two adjacent sets of circumferential rubber sealing strips. These supply ports are connected to an external oil supply system, whose supply pressure is lower than that of the main oil supply port. Integrated check valves within these ports allow only external oil to flow into the oil film cavity, preventing reverse flow of oil from the high-pressure zone, which could lead to a decrease in damping. During damper operation, the oil film is squeezed to form high-pressure and low-pressure zones. In the low-pressure zone, the oil film pressure falls below the saturated vapor pressure of the lubricating oil, triggering cavitation. At this point, external lubricating oil is injected into the low-pressure zone through the one-way valve in the low-pressure oil supply port, slightly raising the pressure there and thus suppressing the formation of cavitation. Meanwhile, the high-pressure zone remains sealed due to the isolation effect of the rubber seal, preventing oil from escaping through the oil supply port. This ensures that the lubricating oil in the high-pressure zone is fully squeezed, significantly increasing the pressure and significantly strengthening the oil film's combined force.

[0015] As an optimization, each arc-shaped oil film area is connected to two low-pressure oil supply holes, and the two low-pressure oil supply holes are arranged axially along the outer ring of the damper.

[0016] As an optimization, an oil supply groove is formed on the outer ring of the inner ring of the damper, and the rubber sealing strip extends into the oil supply groove.

[0017] As an optimization, the oil supply pressure of the low-pressure oil replenishment hole is lower than that of the oil supply hole. In this solution, the oil replenishment pressure is precisely designed, so the injected lubricating oil only eliminates the vapor cavitation effect in the low-pressure area without significantly increasing the overall pressure in the low-pressure area. This avoids damping losses caused by a reduced pressure difference between the high- and low-pressure areas of the oil film.

[0018] The beneficial effects of the present invention are: The present invention adds structures such as rubber sealing strips to an ordinary closed squeeze film damper, dividing the complete annular oil film into multiple arc-shaped oil film areas, improving the extrusion effect of the lubricating oil during the SFD precession process, and significantly increasing the lubricating oil pressure in the high-pressure area, thereby improving the oil film damping.

[0019] The present invention controls the expansion and contraction of the elastic sealing head through an electric drive controller, thereby realizing dynamic opening and closing of the oil supply groove and adapting to the oil supply requirements under different precession frequencies.

[0020] The present invention adds a low-pressure oil replenishment hole and a one-way valve to an ordinary closed squeeze film damper, which can reduce the volume fraction of the steam cavity in the oil film and further enhance the vibration reduction effect of the closed squeeze film damper under high working conditions.

[0021] Even if oil leakage or incomplete oil film occurs due to a fault, the rubber sealing strip can still provide a certain damping effect to maintain the basic vibration reduction function of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the cross-sectional structure at the oil supply groove position in Example 1 of the present invention; Figure 2 For the present invention Figure 1 Middle AA plane section view; Figure 3 For the present invention Figure 1 Middle BB plane cross-sectional view; Figure 4 The pressure cloud diagrams of two SFD oil films at 150 Hz in Example 1 of the present invention are shown; Figure 5 The pressure cloud diagrams of two SFD oil films at 270 Hz in Example 1 of the present invention are shown; Figure 6 Schematic diagram of the cross-sectional structure at the oil supply groove position in Example 2 of the present invention; Figure 7 For the present invention Figure 6 Middle CC section view; Figure 8 For the present invention Figure 6 Middle DD section view; Figure 9 For the present invention Figure 6 Middle EE plane cross-sectional view; Figure 10 The pressure cloud diagrams of two SFD oil films at 150 Hz in Example 2 of the present invention are shown; Figure 11 The pressure cloud diagrams of two SFD oil films at 270 Hz in Example 2 of the present invention are shown; Figure 12 These are the two SFD steam distribution cloud diagrams in Example 2 of the present invention; Figure 13 is a cross-sectional view of a squeeze film damper of the present invention; 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. Rubber sealing strip, 10. Elastic sealing head, 11. Displacement transmission rod, 12. Electronically controlled driver, 13. Low-pressure oil supply hole. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0024] Example 1: like Figures 1 to 13 As shown, the circumferentially divided-cavity composite extrusion oil film damper with adjustable oil groove and steam suppression in this embodiment includes a damper outer ring 1, a damper inner ring 2 and two sealing rings 7 located between the damper outer ring 1 and the damper inner ring 2.

[0025] 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.

[0026] The outer ring of the damper inner ring 2 is provided with an expansion ring groove that accommodates a sealing ring 7. The thickness of the expansion ring groove is slightly greater than that of the sealing ring 7. The elastic force of the sealing ring 7 allows 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 rings 7. The damper outer ring 1 is provided with an oil supply hole 5 that connects to the oil film 6. The installation of the sealing ring 7 significantly reduces the oil outflow channel compared to an open squeeze film damper without a sealing ring structure, thereby reducing the axial flow of lubricating oil, ensuring sufficient oil extrusion and improving the damping of the squeeze film damper.

[0027] 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, so as to realize the rapid replenishment flow of lubricating oil. In this embodiment, the cross section of the sealing ring 7 is rectangular, and the cross section of the oil supply groove 8 is also rectangular.

[0028] A plurality of circumferentially arranged rubber sealing strips 9 are installed between the outer ring 1 and the inner ring 2 of the damper. In this embodiment, there are 3-7 rubber sealing strips 9 and they are evenly distributed around the circumference. The inner ring and outer ring of the damper are provided with grooves at corresponding positions, which fit closely with the rubber sealing strips to ensure a good sealing effect. Figure 3 As shown, the end of the rubber sealing strip 9 is flush with the expansion ring groove, so a narrow gap is left between the end of the rubber sealing strip 9 and the sealing expansion ring 7.

[0029] The rubber sealing strip 9 divides the oil film 6 into a plurality of arc-shaped oil film areas. The oil supply hole 5 is connected to one of the arc-shaped oil film areas. Adjacent arc-shaped oil film areas are circumferentially connected only through the narrow end sealing groove areas at both ends of the damper.

[0030] In this first embodiment, the rubber sealing strip 9 does not extend into the oil supply groove 8. Instead, an elastic sealing head 10 is slidably connected to the middle portion of the rubber sealing strip 9 along the radial direction of the damper inner ring 2. A rectangular sealing head hole is defined in the middle of the rubber sealing strip 9, through which the elastic sealing head 10 passes. The inner ring of the damper outer ring 1 has a groove and includes a drive mechanism for moving the elastic sealing head 10 between the groove and the oil supply groove 8. When the elastic sealing head 10 reaches the bottom of the oil supply groove 8, it blocks the oil supply groove 8.

[0031] The driving mechanism includes a displacement transfer rod 11 radially slidingly connected to the outer ring 1 of the damper and an electric control driver 12 driving the displacement transfer rod 11 to move radially. The electric control driver 12 is a linear motor or a telescopic electromagnet. The displacement transfer rod 11 is a stepped shaft. The large diameter section of the displacement transfer rod 11 is located in the groove, and the small diameter section of the displacement transfer rod 11 passes through the outer ring 1 of the damper.

[0032] The elastic sealing head 10 is fixedly connected to the end of the displacement transmission rod 11, so the radial movement of the displacement transmission rod 11 will drive the elastic sealing head 10 to move. When the elastic sealing head 10 moves to the bottom of the oil supply groove 8, the oil supply groove 8 is cut off. When the elastic sealing head 10 moves outward and leaves the bottom of the oil supply groove 8, the oil supply groove 8 realizes the connection between adjacent arc-shaped oil film areas.

[0033] The method of use of this embodiment 1 is as follows: During damper operation, the electric drive controller drives the displacement transmission rod and elastic sealing head to perform telescopic movement according to the precession frequency. When the precession frequency is low, the elastic sealing head moves toward the inner ring, cutting off the oil supply groove. At this time, the multiple arc-shaped oil film areas are circumferentially connected only by the narrow end seal groove areas at both ends of the damper. Because the lubricating oil flow channels (i.e., oil supply grooves) between each arc-shaped oil film area are blocked by rubber sealing strips, the circumferential flow of lubricating oil along the oil supply grooves is hindered and can only flow circumferentially through the narrow end seal groove gaps. As a result, the lubricating oil pressure in the squeezed arc-shaped oil film area (i.e., the oil film high-pressure area) is significantly increased, thereby significantly increasing the oil film force and improving damping.

[0034] When the damper operates at a high precession frequency, the elastic sealing head retracts toward the outer ring, and the oil supply grooves resume circumferential connectivity. At this point, multiple arc-shaped oil film areas can be connected via the oil supply grooves. Because the cross-sectional area of ​​the oil supply grooves is much larger than the cross-sectional area of ​​the oil film gaps in the end seal grooves, lubricating oil can flow freely between the multiple arc-shaped oil film areas, ensuring that low-pressure areas receive the appropriate amount of oil replenishment, effectively preventing the formation of steam pockets. This dynamic adjustment mechanism ensures optimal drag enhancement under different operating conditions, enhancing the extrusion effect by closing the oil supply grooves at low frequencies and maintaining the stability of the low-pressure areas of the oil film by opening the oil supply grooves at high frequencies.

[0035] Simulation analysis of this embodiment 1: To better verify that the patented circumferentially divided-cavity compound squeeze film damper with an adjustable oil groove can effectively increase oil film pressure in the high-pressure zone and enhance oil film damping, ANSYS software was used to simulate both a conventional closed squeeze film damper and a circumferentially divided-cavity compound squeeze film damper with an eccentricity of 0.3. The simulations only considered the oil film damping and ignored the structural damping of the rubber seal. The damper structural parameters and lubricating oil parameters are shown in Table 1.

[0036] Table 1 SFD model dimensions and lubricating oil parameters The simulation results at 150Hz are as follows Figure 4 , as shown in Table 2. At this point, the elastic seal head of the circumferentially divided compound extruded film damper with an adjustable oil groove is in the closed oil supply groove position. The high-pressure area of ​​the oil film in this circumferentially divided compound extruded film damper with an adjustable oil groove is even higher, significantly improving oil film damping by 67%.

[0037] Table 2 Oil film damping of two SFDs at 150 Hz The simulation results at 270Hz are as follows Figure 5 , as shown in Table 3. At this point, the elastic sealing head of the circumferentially divided compound extruded film damper with an adjustable oil groove is retracted, and the oil supply groove is not sealed. The oil film high-pressure area of ​​the circumferentially divided compound extruded film damper with an adjustable oil groove has slightly higher pressure, resulting in a slight increase in oil film damping of 2.5%.

[0038] Table 3 Oil film damping of two SFDs at 270 Hz Example 2: like Figures 1 to 13 As shown, the circumferentially divided-cavity composite extrusion oil film damper with adjustable oil groove and steam suppression in this embodiment includes a damper outer ring 1, a damper inner ring 2 and two sealing rings 7 located between the damper outer ring 1 and the damper inner ring 2.

[0039] 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.

[0040] The outer ring of the damper inner ring 2 is provided with an expansion ring groove that accommodates a sealing ring 7. The thickness of the expansion ring groove is slightly greater than that of the sealing ring 7. The elastic force of the sealing ring 7 allows 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 rings 7. The damper outer ring 1 is provided with an oil supply hole 5 that connects to the oil film 6. The installation of the sealing ring 7 significantly reduces the oil outflow channel compared to an open squeeze film damper without a sealing ring structure, thereby reducing the axial flow of lubricating oil, ensuring sufficient oil extrusion and improving the damping of the squeeze film damper.

[0041] 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, so as to realize the rapid replenishment flow of lubricating oil. In this embodiment, the cross section of the sealing ring 7 is rectangular, and the cross section of the oil supply groove 8 is also rectangular.

[0042] A plurality of circumferentially arranged rubber sealing strips 9 are installed between the outer ring 1 and the inner ring 2 of the damper. In this embodiment, there are 3-7 rubber sealing strips 9 and they are evenly distributed around the circumference. The inner ring and outer ring of the damper are provided with grooves at corresponding positions, which fit closely with the rubber sealing strips to ensure a good sealing effect. Figure 3 As shown, the end of the rubber sealing strip 9 is flush with the expansion ring groove, so a narrow gap is left between the end of the rubber sealing strip 9 and the sealing expansion ring 7.

[0043] The rubber sealing strip 9 divides the oil film 6 into a plurality of arc-shaped oil film areas. The oil supply hole 5 is connected to one of the arc-shaped oil film areas. Adjacent arc-shaped oil film areas are circumferentially connected only through the narrow end sealing groove areas at both ends of the damper.

[0044] In this embodiment 2, adjacent arc-shaped oil film areas are separated by a rubber sealing strip 9 , and the rubber sealing strip 9 extends into the oil supply groove 8 .

[0045] Each arc-shaped oil film area is provided with a low-pressure oil supply hole 13 on the damper outer ring 1. The oil supply pressure of the low-pressure oil supply hole 13 is lower than the oil supply pressure of the oil supply hole 5. The low-pressure oil supply hole 13 is provided with a one-way valve that opens in the direction of the arc-shaped oil film area.

[0046] like Figure 9 As shown, each arc-shaped oil film area is connected to two low-pressure oil supply holes 13 and the two low-pressure oil supply holes 13 are arranged axially along the outer ring 1 of the damper.

[0047] The method of use of this embodiment 2: Multiple sets of rubber sealing strips circumferentially divide the complete annular oil film into multiple independent arcuate oil film cavities. The damper's inner and outer rings are grooved at locations corresponding to the rubber sealing strips. Each set of rubber sealing strips fits tightly together in the corresponding grooves, ensuring sealing. This allows each arcuate oil film cavity to form independent high-pressure and low-pressure zones during dynamic extrusion. Due to the circumferential oil film sub-cavities, the pressure in the low-pressure zone of the oil film is lower, making steam pockets more likely to form. To further eliminate steam pockets in the low-pressure zone, two low-pressure oil supply holes are symmetrically positioned along the axial center of the oil film zone, between two adjacent sets of circumferential rubber sealing strips. These oil supply holes are connected to the external oil supply system, with a supply pressure lower than that of the main oil supply hole. A one-way valve structure is integrated within the oil supply hole, allowing only external oil to flow into the oil film cavity, preventing reverse outflow of oil from the high-pressure zone, which would result in a decrease in damping.

[0048] When the damper operates, the oil film is squeezed to form high-pressure and low-pressure zones. In the low-pressure zone, the oil film pressure falls below the saturated vapor pressure of the lubricating oil, triggering cavitation. At this point, external lubricating oil is injected into the low-pressure zone through the one-way valve in the low-pressure oil feed hole, slightly increasing the pressure in this area and thus suppressing the formation of cavitation. Because the oil feed pressure is precisely designed, the injected oil only eliminates the vapor cavitation effect in the low-pressure zone without significantly increasing the overall pressure in this zone, thus avoiding damping losses caused by a reduced pressure differential between the high- and low-pressure zones of the oil film. At the same time, the high-pressure zone remains sealed due to the isolating effect of the rubber sealing strip, preventing oil from escaping through the oil feed hole. This ensures that the lubricating oil in the high-pressure zone is fully squeezed, significantly increasing the pressure and significantly strengthening the combined force of the oil film.

[0049] Simulation analysis of this embodiment 2: To better verify that the patented circumferentially divided-cavity compound squeeze film damper can effectively increase oil film pressure in the high-pressure zone and enhance oil film damping, ANSYS software was used to simulate both a conventional closed squeeze film damper and a circumferentially divided-cavity compound squeeze film damper with an eccentricity of 0.3. The simulations only considered the oil film damping and ignored the structural damping of the rubber seal. The damper structural parameters and lubricating oil parameters are shown in Table 4.

[0050] Table 4 SFD model dimensions and lubricating oil parameters The simulation results at 150Hz are as follows Figure 10 , as shown in Table 5. The circumferentially divided cavity compound squeeze film damper with a steam cavitation suppression structure has a higher pressure in the oil film high-pressure area, and the oil film damping is greatly improved by 52%.

[0051] Table 5 Oil film damping of two SFDs at 150 Hz The simulation results at 270Hz are as follows Figure 11, as shown in Table 6. The circumferentially divided cavity compound squeeze film damper with a steam cavitation suppression structure has a higher pressure in the oil film high-pressure area, and the oil film damping is improved by 28.9%.

[0052] Table 6 Oil film damping of two SFDs at 270 Hz In order to verify the effectiveness of the steam cavity suppression structure in this patent, a simulation of the circumferential cavity composite SFD with and without the steam cavity suppression structure was carried out, and the precession frequency was selected as 270Hz. Figure 12 As shown, the vapor cavitation suppression structure significantly reduces the lubricating oil vapor content in the oil film.

[0053] In summary, this patent can significantly improve the oil film damping at low frequencies and slightly improve the oil film damping at high frequencies, which verifies the effectiveness of this patent in improving damping.

[0054] 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 circumferentially divided-cavity composite extrusion oil film damper with adjustable oil groove and steam suppression, comprising a damper outer ring (1), a damper inner ring (2), and two sealing rings (7) located between the damper outer ring (1) and the damper inner ring (2), an oil film (6) located between the two sealing rings (7) is formed between the damper outer ring (1) and the damper inner ring (2), an oil supply hole (5) communicating with the oil film (6) is opened on the damper outer ring (1), and the characteristics are: A plurality of circumferentially arranged rubber sealing strips (9) are installed between the damper outer ring (1) and the damper inner ring (2). The rubber sealing strips (9) divide the oil film (6) into a plurality of arc-shaped oil film areas, and the oil supply hole (5) is connected to one of the arc-shaped oil film areas.

2. The circumferentially divided cavity type compound extruded oil film damper with adjustable oil groove and steam suppression according to claim 1 is characterized in that: The rubber sealing strips (9) are provided in 3-7 pieces.

3. The circumferentially divided cavity type composite extruded oil film damper with adjustable oil groove and steam suppression according to claim 1 is characterized in that: The outer ring of the damper inner ring (2) is provided with an annular oil supply groove (8), the middle part of the rubber sealing strip (9) is slidably connected with an elastic sealing head (10) along the radial direction of the damper inner ring (2), the inner ring of the damper outer ring (1) is provided with a groove, and further includes a driving mechanism for driving the elastic sealing head (10) to move between the groove and the oil supply groove (8), and the elastic sealing head (10) cuts off the oil supply groove (8) when it moves to the bottom of the oil supply groove (8).

4. The circumferentially divided cavity type compound extruded oil film damper with adjustable oil groove and steam suppression according to claim 3 is characterized in that: A rectangular sealing head through hole is provided in the middle of the rubber sealing strip (9), and the elastic sealing head (10) passes through the sealing head through hole.

5. The circumferentially divided cavity type compound extruded oil film damper with adjustable oil groove and steam suppression according to claim 3 is characterized in that: The driving mechanism comprises a displacement transmission rod (11) radially slidingly connected to the outer ring (1) of the damper and an electric control driver (12) driving the displacement transmission rod (11) to move radially. The elastic sealing head (10) is fixedly connected to the end of the displacement transmission rod (11).

6. The circumferentially divided cavity type compound extruded oil film damper with adjustable oil groove and steam suppression according to claim 5 is characterized in that: The displacement transmission rod (11) is a stepped shaft, the large diameter section of the displacement transmission rod (11) is located in the groove, and the small diameter section of the displacement transmission rod (11) passes through the outer ring (1) of the damper.

7. The circumferentially divided cavity type compound extruded oil film damper with adjustable oil groove and steam suppression according to claim 1 is characterized in that: Adjacent arc-shaped oil film areas are separated by rubber sealing strips (9), and each arc-shaped oil film area is provided with a low-pressure oil supply hole (13) opened on the outer ring (1) of the damper, and a one-way valve opening in the direction of the arc-shaped oil film area is provided on the low-pressure oil supply hole (13).

8. The circumferentially divided cavity type compound extruded oil film damper with adjustable oil groove and steam suppression according to claim 7 is characterized in that: Each arc-shaped oil film area is connected to two low-pressure oil supply holes (13), and the two low-pressure oil supply holes (13) are arranged axially along the outer ring (1) of the damper.

9. The circumferentially divided cavity type compound extruded oil film damper with adjustable oil groove and steam suppression according to claim 7, characterized in that: The outer ring of the damper inner ring (2) is provided with an oil supply groove (8), and the rubber sealing strip (9) extends into the oil supply groove (8).

10. The circumferentially divided cavity type compound extruded oil film damper with adjustable oil groove and steam suppression according to claim 7, characterized in that: The oil supply pressure of the low-pressure oil replenishing hole (13) is lower than the oil supply pressure of the oil supply hole (5).

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