Squeezing oil film damper based on one-way valve oil supply structure

Abstract

The invention discloses a squeeze film damper based on a one-way valve oil supply structure, belongs to the technical field of structural design of squeeze film dampers of aero-engines, and aims to solve the problems that periodic high-pressure backflow and low-pressure cavitation can be generated when a traditional squeeze film damper works. The extrusion oil film damper comprises an outer sleeve, an outer ring and a mouse cage inner ring, the mouse cage inner ring is coaxially sleeved with the outer sleeve and the outer ring in sequence from outside to inside, two one-way valve oil supply units are installed on the outer sleeve, and the two one-way valve oil supply units are orthogonally arranged; external oil sequentially flows through the outer sleeve and the outer ring through the two one-way valve oil supply units and enters the oil film area of the outer ring and the inner ring of the mouse cage, and the oil film damper is extruded to prevent internal high-pressure lubricating oil from flowing back through the one-way valve oil supply units. The damping structure is mainly used as a damping structure of a shafting mechanism in an aero-engine.

Description

Technical Field

[0001] This invention belongs to the technical field of aero-engine extrusion oil film damper structure design, specifically relating to an extrusion oil film damper based on a one-way valve oil supply structure. Background Technology

[0002] As the core power unit of aviation equipment, aero-engines operate in extremely harsh environments, requiring long-term stable operation under conditions of high-speed rotation, high temperature and high pressure, and complex load coupling. The rotor system, as a critical rotating component of the engine, directly affects the engine's operational safety, reliability, and service life through vibration control. Excessive vibration not only exacerbates fatigue wear of components and reduces sealing performance but can also cause serious malfunctions such as rotor-stator rubbing, and even engine shutdown. Therefore, efficient vibration reduction technology is one of the core issues in aero-engine design and optimization.

[0003] As a passive vibration reduction device based on the dissipation effect of viscous fluid, the squeeze film damper has become a core component for vibration control of modern aero-engine rotor systems due to its significant advantages such as compact structure, simple design, high reliability, and controllable cost. Its basic working principle is as follows: a specific thickness annular gap is reserved between the inner and outer rings of the rotor support structure to form an oil film region. When the rotor experiences whirling or vibration, the viscous lubricating oil in the oil film is squeezed and flows, absorbing vibration energy through shear friction and viscous dissipation within the fluid, thereby increasing system damping, effectively isolating the rotor vibration from the transmission to the support structure, reducing the impact load of rotating components on the stator structure, and ensuring the stable operation of the rotor system.

[0004] However, traditional extrusion oil film dampers still face unavoidable technical bottlenecks in practical applications. During the dynamic operation of the rotor-damper system, the rotor's whirl motion causes periodic and severe fluctuations in the pressure field within the oil film region. On the one hand, the local high-pressure areas generated by whirl push the lubricating oil to flow in the opposite direction along the oil supply channel, forming a high-pressure backflow phenomenon. This backflow not only interferes with the normal oil supply circuit and reduces oil supply efficiency but also counteracts the forward oil supply, disrupting the stability of the oil film. On the other hand, the local low-pressure areas caused by whirl cause the lubricating oil pressure to fall below its saturated vapor pressure, leading to the formation of bubbles in the oil film and low-pressure cavitation. The generation and collapse of cavitation bubbles disrupt the continuity of the oil film, significantly weakening the damping characteristics and vibration reduction effect of the extrusion oil film. It can also trigger secondary problems such as cavitation erosion and increased noise, and in severe cases, even lead to oil film failure, threatening the operational safety of the rotor system.

[0005] To address the aforementioned issues, the industry has attempted to improve the situation by optimizing oil film thickness, increasing oil supply pressure, and designing irregularly shaped oil grooves. However, these solutions are mostly limited to adjusting local parameters and have failed to fundamentally solve the problem of synergistic suppression of lubricating oil backflow and cavitation. For example, simply increasing the oil supply pressure can alleviate cavitation to some extent, but it will exacerbate backflow impact; optimizing oil film thickness is difficult to adapt to the changes in vibration characteristics over a wide range of engine operating conditions, and the vibration reduction effect is not stable enough.

[0006] Therefore, the performance deficiencies of traditional extruded oil film dampers under complex scenarios such as high-frequency operation and large-amplitude vortexing have become a key factor restricting further improvement in the vibration reduction effect of aero-engine rotor systems. Based on this, research is being conducted on a novel extruded oil film damper structure capable of precisely suppressing lubricating oil backflow and effectively replenishing flow in the cavitation region. Through innovative design, the inherent limitations of traditional structures are overcome, enhancing the stability and reliability of damping performance and reducing rotor vibration amplitude. This has significant engineering value and practical implications for improving the overall operating performance and safety redundancy of aero-engines. Summary of the Invention

[0007] In order to solve the problem that traditional extrusion oil film dampers produce periodic high-pressure backflow and low-pressure cavitation during operation, which weakens the damping characteristics of the extrusion oil film damper, this invention provides an extrusion oil film damper based on a one-way valve oil supply structure.

[0008] A squeeze film damper based on a one-way valve oil supply structure is disclosed. The squeeze film damper includes an outer jacket, an outer ring, and a squirrel cage inner ring. The outer jacket and the outer ring are coaxially mounted on the squirrel cage inner ring from the outside to the inside. Two one-way valve oil supply units are installed on the outer jacket. The two one-way valve oil supply units are orthogonally arranged. External oil flows through the two one-way valve oil supply units in sequence through the outer jacket and the outer ring and enters the oil film area between the outer ring and the squirrel cage inner ring. The squeeze film damper prevents the internal high-pressure lubricating oil from flowing back through the one-way valve oil supply units.

[0009] Furthermore, one end of the outer ring is provided with a No. 1 flange for connection with the inner ring of the squirrel cage. Two circumferential oil grooves are machined on the outer ring wall along the axial direction of the outer ring, and two axial oil grooves are machined between the two circumferential oil grooves. Each axial oil groove and a one-way valve oil supply unit are symmetrically arranged along the axis of the squeeze oil film damper. Four oil holes are machined equidistantly along the circumferential direction on the outer ring wall. Two of the four oil holes are respectively connected to one of the axial oil grooves, and the other two of the four oil holes are respectively connected to one of the one-way valve oil supply units.

[0010] Furthermore, the inner ring of the squirrel cage includes a squirrel cage section and an oil film inner ring section. The squirrel cage section and the oil film inner ring section are coaxially arranged, and one end of the squirrel cage section is fixedly connected to one end of the oil film inner ring section. The other end of the squirrel cage section is provided with a second flange for connecting with the outer ring.

[0011] Furthermore, a ring groove for installing piston rings is machined on the outer circular surface at both ends of the inner ring section of the oil film, and an oil supply ring groove is machined on the outer circular surface in the middle of the inner ring section of the oil film. An oil film area is formed between the inner wall of the inner ring section of the oil film and the outer wall of the outer ring.

[0012] Furthermore, the thickness of the oil film area is 0.1~0.5mm;

[0013] Furthermore, the outer sleeve is coaxially fitted onto the outer ring and detachably connected to the outer ring via multiple bolts;

[0014] Furthermore, an annular baffle is provided on the inner ring wall at the end of the outer ring away from the No. 1 flange. Multiple connecting through holes for connecting to the outer ring are machined equidistantly along the circumferential direction on one end face of the annular baffle. Multiple threaded holes for connecting to the outer ring are machined circumferentially on the end face of the outer ring corresponding to the annular baffle. Each threaded hole is coaxially corresponding to a connecting through hole. The threaded section of each bolt passes through a connecting through hole and extends into the corresponding threaded hole and is threadedly connected to the outer ring.

[0015] Furthermore, the one-way valve oil supply unit includes a one-way valve housing and a one-way valve. The one-way valve housing is disposed on the outer ring wall of the outer sleeve and integrally formed with the outer sleeve. The one-way valve is installed inside the one-way valve housing. The top of the one-way valve housing is machined with an oil inlet hole for communicating with an external oil source. The one-way valve housing is machined with an oil passage hole corresponding to the oil passage hole and a supplementary cavitation channel cooperating with the circumferential oil groove. The one-way valve is used to introduce the oil input from the external oil source into the oil passage hole or the supplementary cavitation channel, while preventing the high-pressure lubricating oil inside the squeeze oil film damper from flowing back.

[0016] Furthermore, an electromagnet for attracting and fixing the one-way valve is installed inside the one-way valve housing;

[0017] Furthermore, the one-way valve includes a top cylinder and a conical valve core. The top cylinder is coaxially positioned directly above the conical valve core and is fixedly connected to the conical valve core via a connecting rod. The top cylinder is located in the oil inlet and is correspondingly matched with the supplementary cavitation channel. The conical valve core is located inside the one-way valve housing and is correspondingly matched with the oil passage hole. The top of the top cylinder has multiple oil holes machined at equal intervals along the circumference, and the outer wall of the conical valve core has multiple oil passage grooves machined at equal intervals along the circumference.

[0018] The beneficial effects of this application compared to the prior art are:

[0019] 1. This application provides a squeeze oil film damper based on a one-way valve oil supply structure. Through the innovative design of integrating the one-way valve oil supply structure, it achieves a synergistic solution to high-pressure backflow and low-pressure cavitation. The one-way valve adopts a conical spring valve core structure. When the oil supply pressure is greater than the internal pressure of the oil film, the valve core is subjected to oil pressure impact and generates a small displacement, and the lubricating oil can smoothly enter the oil film area through the hollow structure. When the rotor vortex causes high-pressure backflow, the valve core and the one-way valve shell on the outer sleeve are tightly fitted, completely blocking the backflow channel, avoiding the collision interference between backflow and forward oil supply, and ensuring the stability of the oil film. Simultaneously, when backflow occurs, the valve core moves upward to open the supplementary cavitation oil circuit, precisely introducing lubricating oil into the cavitation area 180 degrees circumferentially separated from the backflow area. Through the guidance and delivery of the circumferential and axial oil grooves, the flow in the low-pressure area is quickly replenished, inhibiting the generation and collapse of bubbles, avoiding the disruption of the oil film continuity, and ensuring that the damping characteristics are no longer weakened by pressure fluctuations. Compared with traditional dampers, the vibration reduction effect is significantly improved, and the rotor vibration amplitude is greatly reduced.

[0020] 2. This application provides a squeeze film damper based on a one-way valve oil supply structure, which is specifically optimized for complex scenarios such as high-frequency operating conditions and large-amplitude eddy currents in aero-engines. The hydrodynamic design of the one-way valve structure minimizes the flow resistance when the lubricating oil flows downstream and keeps the pressure loss within a reasonable range, ensuring a stable oil supply in the oil film area. The gap between the inner and outer rings of the oil film formed by the extension of the squirrel cage can flexibly adapt to different vibration characteristics. Combined with the flexible support of the squirrel cage bars, the damper can maintain a stable vibration reduction effect under a wide speed range and variable load conditions. This solves the problem that traditional dampers are difficult to adapt to multiple operating conditions through local parameter adjustments, and is especially suitable for the extremely harsh dynamic operating environment of aero-engines.

[0021] 3. This application provides a squeeze film damper based on a one-way valve oil supply structure. Compared to traditional dampers that rely on localized improvements such as optimizing oil film thickness and adjusting oil supply pressure, this application addresses the essence of the oil supply structure by deeply integrating the one-way valve function with the cavitation replenishment oil circuit, forming a linkage mechanism for backflow prevention and replenishment. This fundamentally solves the technical bottleneck of traditional structures being unable to simultaneously suppress backflow and alleviate cavitation. This structural innovation not only eliminates the need for complex control systems, maintaining the core advantages of passive vibration damping equipment such as simple structure and high reliability, but also achieves a leapfrog improvement in damping performance. It provides a new and efficient solution for vibration control of aero-engine rotor systems, possessing significant engineering application value and promising prospects for widespread application. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the extrusion oil film damper described in this application;

[0023] Figure 2 This is a schematic diagram of the outer sleeve in the extrusion oil film damper described in this application;

[0024] Figure 3 This is a schematic diagram of the outer ring structure in the extrusion film damper described in this application;

[0025] Figure 4 This is a schematic diagram of the inner ring of the squirrel cage in the extrusion oil film damper described in this application;

[0026] Figure 5 This is a schematic diagram of the one-way valve in the extrusion film damper described in this application;

[0027] Figure 6 This is a top view of the check valve in the extrusion film damper described in this application;

[0028] Figure 7 This is a cross-sectional view of the extrusion oil film damper described in this application during operation with lubricating oil flowing in the same direction.

[0029] Figure 8 This is a cross-sectional view of the extrusion oil film damper described in this application during lubricating oil backflow in operation;

[0030] Figure 9 This application provides a supplementary oil circuit cross-section diagram related to cavitation in the extrusion oil film damper.

[0031] Figure 10 This is a detailed diagram of the oil groove in the cavitation-related oil circuit of the extrusion oil film damper described in this application;

[0032] Figure 11 This is a schematic diagram of the electromagnet and check valve working together in the extrusion film damper described in this application;

[0033] Figure 12 This is a structural diagram of the piston ring in the extrusion film damper described in this application;

[0034] Figure 13 This is a schematic diagram of the piston ring installation in the extrusion film damper described in this application;

[0035] Figure 14 This is a cross-sectional view of the extrusion film damper described in this application;

[0036] Figure 15 This is a schematic diagram of the internal structure of the extrusion film damper described in this application.

[0037] In the picture:

[0038] 1 Outer casing, 11 One-way valve housing, 111 Supplemental cavitation channel, 12 Oil inlet, 13 Connecting through hole;

[0039] 2 Outer ring, 21 Oil passage hole, 22 Axial oil groove, 23 Circumferential oil groove, 24 No. 1 flange;

[0040] 3. Inner ring of the squirrel cage, 31. No. 2 flange, 32. Squirrel cage section, 33. Inner ring section of oil film, 331. Oil supply ring groove, 332. Ring groove, 333. Oil film area;

[0041] 4. Check valve, 41. Top cylinder, 42. Conical valve core;

[0042] 5. Electromagnets;

[0043] 6 piston rings;

[0044] 7 bearings. Detailed Implementation

[0045] Specific implementation method one: Combining Figure 1 and Figure 15 This embodiment describes a squeeze film damper based on a one-way valve oil supply structure. The squeeze film damper includes an outer sleeve 1, an outer ring 2, and a squirrel cage inner ring 3. The outer sleeve 1 and the outer ring 2 are coaxially mounted on the squirrel cage inner ring 3 from the outside to the inside. Two one-way valve oil supply units are installed on the outer sleeve 1. The two one-way valve oil supply units are orthogonally arranged. External oil flows through the two one-way valve oil supply units sequentially through the outer sleeve 1 and the outer ring 2 and enters the oil film area between the outer ring 2 and the squirrel cage inner ring 3. The squeeze film damper prevents the internal high-pressure lubricating oil from flowing back through the one-way valve oil supply units.

[0046] One end of the outer ring 2 is provided with a flange 24 for connecting with the inner ring 3 of the cage. Two circumferential oil grooves 23 are machined on the outer ring wall of the outer ring 2 along the axial direction of the outer ring 2. Two axial oil grooves 22 are machined between the two circumferential oil grooves 23. Each axial oil groove 22 is symmetrically arranged with a one-way valve oil supply unit along the axis of the squeeze oil film damper. Four oil holes 21 are machined equidistantly along the circumferential direction on the outer ring wall of the outer ring 2. Two of the four oil holes 21 are respectively connected to one axial oil groove 22. The other two oil holes 21 are respectively connected to one one-way valve oil supply unit.

[0047] The inner ring 3 of the squirrel cage includes a squirrel cage section 32 and an oil film inner ring section 33. The squirrel cage section 32 and the oil film inner ring section 33 are coaxially arranged, and one end of the squirrel cage section 32 is fixedly connected to one end of the oil film inner ring section 33. The other end of the squirrel cage section 32 is provided with a second flange 31 for connecting with the outer ring 2.

[0048] An annular groove 332 for installing piston ring 6 is machined on the outer circular surface at both ends of the inner annular segment 33. An oil supply annular groove 331 is machined on the outer circular surface in the middle of the inner annular segment 33. An oil film region 333 is formed between the inner wall of the inner annular segment 33 and the outer wall of the outer ring 2. The thickness of the oil film region 333 is 0.1~0.5mm.

[0049] The squeeze film damper based on the one-way valve oil supply structure provided in this embodiment allows lubricating oil in the forward direction (flowing from the oil source to the oil film area) to smoothly pass through the one-way valve core in the outer sleeve and enter the oil film area between the outer ring and the squirrel cage; for lubricating oil in the reverse direction (due to the high pressure area generated by the rotor vortex, the lubricating oil reverses, i.e., flows in the reverse direction from the oil film area to the oil source), it is deflected back by the check valve and re-enters the oil film, and the oil is supplied to the supplementary cavitation oil path to supplement the cavitation area that is 180 degrees circumferentially separated from the check area.

[0050] The squeezing oil film damper in this embodiment adopts a modular design. The inner ring 3 of the squirrel cage and the outer ring 2 are precisely matched through the first flange 24 and the second flange 31. The outer sleeve 1 is coaxially sleeved on the outer ring 2 and is detachably connected to the outer ring 2 by multiple bolts. An annular baffle is provided on the inner ring wall of the outer sleeve 1 at the end away from the first flange 24. Multiple connecting through holes 13 for connecting to the outer ring 2 are machined circumferentially at equal intervals on one end face of the annular baffle. Multiple threaded holes for connecting to the outer sleeve 1 are machined circumferentially on the end face of the outer ring 2 at the end corresponding to the annular baffle. Each threaded hole is coaxially corresponding to a connecting through hole 13. The threaded section of each bolt passes through a connecting through hole 13 and extends to the corresponding threaded hole and is threadedly connected to the outer ring 2. The modular design makes the assembly process simple and efficient, and is easy to integrate and fix in the aero-engine rotor system.

[0051] In this embodiment, the extended portion of the inner ring 3 of the squirrel cage serves as the inner ring of the oil film region of the extrusion oil film damper. The oil film region 333 has an oil supply ring groove 331 in the center and ring grooves 332 for installing piston rings on both sides. The piston ring 6 is installed in the ring groove 332 of the extended portion of the squirrel cage for sealing. The piston ring 6 ensures a tight fit between the outer ring 2 and the inner ring 3 of the squirrel cage, effectively reducing the leakage of lubricating oil in the oil film region. This allows the lubricating oil to fully participate in the extrusion flow, maximizing the viscous dissipation effect and further increasing the damping coefficient. The extended portion of the inner ring 3 of the squirrel cage and the outer ring 2 form an oil film. Oil passage holes 21 extending radially are evenly distributed on the outer ring 2, allowing lubricating oil from the oil source to enter the oil film region between the outer ring 2 and the inner ring 3 of the squirrel cage through the outer sleeve 1. The outer sleeve 1 contains a one-way valve oil supply unit. Lubricating oil from the oil source can enter the oil film through the valve core via the positive one-way valve oil supply unit. The one-way valve oil supply unit also has a backflow prevention function, because the rotor vortex... The backflow of lubricating oil generated by the movement is stopped by the one-way valve oil supply unit. The one-way valve oil supply unit moves under the influence of oil pressure, thereby opening the supplementary cavitation channel, allowing oil from the oil source to enter the supplementary cavitation channel to supplement the low-pressure cavitation area. The sealing structure composed of piston ring 6 works in synergy with the one-way valve oil supply unit, which avoids backflow loss and reduces leakage loss, thereby improving the oil supply efficiency and damping efficiency simultaneously. Compared with traditional dampers without a sealing structure, the energy loss is lower and the vibration reduction response is faster. At the same time, the key components such as the one-way valve oil supply unit and piston ring 6 in this application have a simple structure and are easy to replace after wear. The two orthogonally arranged one-way valve oil supply units not only ensure the uniformity of oil supply, but also reduce the impact of a single unit failure on the overall performance. Combined with the one-piece molded one-way valve shell structure, the fatigue resistance and service life of the equipment are greatly improved, the later maintenance costs are reduced, and it is fully adapted to the high reliability and long service life requirements of aero engines.

[0052] Specific Implementation Method Two: Combining Figures 1 to 15 This embodiment is a further definition of specific embodiment one. The one-way valve oil supply unit includes a one-way valve housing 11 and a one-way valve 4. The one-way valve housing 11 is disposed on the outer ring wall of the outer sleeve 1 and integrally formed with the outer sleeve 1. The one-way valve 4 is installed inside the one-way valve housing 11. The top of the one-way valve housing 11 is machined with an oil inlet hole 12 for communicating with an external oil source. The one-way valve housing 11 is machined with an oil passage hole corresponding to the oil passage hole 21 and a supplementary cavitation channel 111 cooperating with the circumferential oil groove 23. The one-way valve 4 is used to introduce the oil input from the external oil source into the oil passage hole or the supplementary cavitation channel 111, while preventing the high-pressure lubricating oil inside the squeeze oil film damper from flowing back.

[0053] The one-way valve 4 includes a top cylinder 41 and a conical valve core 42. The top cylinder 41 is coaxially disposed directly above the conical valve core 42 and is fixedly connected to the conical valve core 42 via a connecting rod. The top cylinder 41 is located in the oil inlet hole 12 and is correspondingly configured to cooperate with the supplementary cavitation channel 111. The conical valve core 42 is located inside the one-way valve housing 11 and is correspondingly configured to cooperate with the oil passage hole. The top of the top cylinder 41 has multiple oil holes machined at equal intervals along the circumference. The outer wall of the conical valve core 42 has multiple oil passage grooves machined at equal intervals along the circumference. Other components and connection methods are the same as in the first specific embodiment.

[0054] In this embodiment, the one-way valve oil supply unit has a conical valve core structure. The lubricating oil from the oil source first passes through the perforated oil hole on the top cylinder 41. The perforated oil hole allows the lubricating oil to pass through, while the side of the top cylinder 41 prevents the lubricating oil from entering the supplementary cavitation channel 111. After passing through the small cylindrical part, the lubricating oil passes through the larger conical surface and enters the oil passage hole through the three circumferentially distributed oil grooves on the conical surface, and then enters the oil film area.

[0055] In the forward flow state of lubricating oil, the conical valve core 42 of the one-way valve is in its original position. The lubricating oil from the oil source first enters the gap between the conical valve core 42 and the wall surface through the top cylinder 41, and then enters the main flow channel hole through the oil groove on the conical surface. In the main flow channel hole, the lubricating oil passes through the outer sleeve 1 and the outer ring 2 in sequence and enters the oil film area. In the reverse flow state of lubricating oil, the conical valve core 42 moves upward under the action of the reverse flow oil pressure and presses against the conical wall surface in the outer sleeve. As the conical valve core 42 moves upward, the side channel blocked by the top cylinder 41 in the cavitation replenishment channel 111 is opened, and the lubricating oil from the oil source can enter the cavitation replenishment channel 111. The lubricating oil used to replenish cavitation first enters the circumferential oil groove 23 in the outer ring, flows in the circumferential oil groove 23 in the outer ring to the oil film area circumferentially spaced by 180 degrees, and then enters the corresponding oil passage hole 21 through the axial oil groove 22 for replenishing cavitation 180 degrees.

[0056] Specific implementation method three: Combining Figures 1 to 15 This embodiment further defines specific embodiment one, and an electromagnet 5 for attracting and fixing the one-way valve 4 is installed inside the one-way valve housing 11. Other components and connections are the same as in specific embodiment three.

[0057] In this embodiment, the circumferential electromagnet 5 integrated inside the one-way valve housing 11 on the outer casing 1 gives the damper a bidirectional switching function between traditional and optimized modes. When not energized, the one-way valve normally performs the functions of check valve and cavitation compensation, meeting the requirements of high-precision vibration reduction. When energized, the electromagnet attracts and fixes the valve core, the one-way valve function fails, and the damper can be directly used as a traditional squeeze oil film damper, adapting to different operating scenarios, maintenance needs, or transitional use conditions, greatly improving the versatility and practicality of the equipment, and reducing the user's equipment replacement and adaptation costs.

[0058] The present invention has been disclosed above with preferred embodiments, but it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

[0059] Working principle:

[0060] The extrusion oil film damper based on a one-way valve oil supply structure provided in this application achieves the following steps in operation: suppressing high-pressure lubricating oil backflow and replenishing the low-pressure cavitation area.

[0061] Step 1: Complete the installation of the extrusion oil film damper, bearings, and rotor system based on the one-way valve oil supply structure;

[0062] Step 2: The rotor rotates, causing the squirrel cage inner ring 3 in the squeeze oil film damper based on the one-way valve oil supply structure to vortex;

[0063] Step 3: The lubricating oil from the external oil source first enters the outer sleeve 1, flows through the one-way valve 4 in the oil inlet hole 12 on the outer sleeve 1, enters the oil outlet hole 21 in the outer ring 2, and then flows to the oil film area 333 between the outer ring 2 and the inner ring 3 of the cage.

[0064] Step 4: The rotor whirls, causing the inner ring to whirl as well, resulting in a high oil pressure zone and a low-pressure cavitation zone in the oil film area 333. When the high oil pressure zone coincides with the radial direction of the check valve, the reverse flow oil pressure causes the conical valve core 42 in the check valve to press tightly against the conical inner wall of the check valve body 11, blocking the high-pressure lubricating oil return path. At the same time, as the conical valve core 42 moves upward, it opens the oil passage for supplementing cavitation. When backflow occurs, the lubricating oil enters the oil passage for supplementing cavitation 111 to supplement the low-pressure cavitation zone that is 180 degrees circumferentially separated from the high-pressure reverse flow zone.

Claims

1. A squeeze film damper based on a one-way valve oil supply structure, the squeeze film damper comprising an outer sleeve (1), an outer ring (2) and a squirrel cage inner ring (3), the outer sleeve (1) and the outer ring (2) being coaxially sleeved on the squirrel cage inner ring (3) from outside to inside, characterized in that: The outer sleeve (1) is provided with two one-way valve oil supply units, which are arranged orthogonally, and external oil flows through the two one-way valve oil supply units in sequence, passes through the outer sleeve (1) and the outer ring (2), and enters the oil film area between the outer ring (2) and the squirrel cage inner ring (3), and the internal high-pressure lubricating oil is prevented from flowing back by the one-way valve oil supply unit.

2. The squeeze film damper based on the one-way valve oil supply structure according to claim 1, characterized in that: One end of the outer ring (2) is provided with a first flange (24) for connecting with the squirrel cage inner ring (3), and two circumferential oil grooves (23) are formed on the outer wall of the outer ring (2) along the axial direction of the outer ring (2), two axial oil grooves (22) are formed between the two circumferential oil grooves (23), and each axial oil groove (22) is arranged symmetrically along the axis of the squeeze film damper, four oil passing holes (21) are formed equidistantly on the outer wall of the outer ring (2) along the circumferential direction, two of the four oil passing holes (21) are arranged in communication with one axial oil groove (22) respectively, and the other two of the four oil passing holes (21) are arranged in communication with one one-way valve oil supply unit respectively.

3. The squeeze film damper based on the one-way valve oil supply structure according to claim 2, characterized in that: The squirrel cage inner ring (3) comprises a squirrel cage section (32) and an oil film inner ring section (33), the squirrel cage section (32) and the oil film inner ring section (33) are coaxially arranged, and one end of the squirrel cage section (32) is fixedly connected with one end of the oil film inner ring section (33), and the other end of the squirrel cage section (32) is provided with a second flange (31) for connecting with the outer ring (2).

4. The squeeze film damper based on the one-way valve oil supply structure according to claim 1, characterized in that: An annular groove (332) for mounting a piston ring (6) is formed on the outer circumferential surface of each end of the oil film inner ring section (33), an oil supply annular groove (331) is formed on the outer circumferential surface of the middle part of the oil film inner ring section (33), and an oil film area (333) is formed between the inner wall of the oil film inner ring section (33) and the outer wall of the outer ring (2).

5. The squeeze film damper based on the one-way valve oil supply structure according to claim 4, characterized in that: The thickness of the oil film area (333) is 0.1-0.5mm.

6. The squeeze film damper based on the one-way valve oil supply structure according to claim 5, characterized in that: The outer sleeve (1) is coaxially sleeved on the outer ring (2) and detachably connected with the outer ring (2) through a plurality of bolts.

7. The squeeze film damper based on the one-way valve oil supply structure according to claim 6, characterized in that: An annular baffle is arranged on the inner ring wall of the end of the outer sleeve (1) away from the first flange (24), a plurality of connecting through holes (13) for connecting with the outer ring (2) are equidistantly formed on the end face of one end of the annular baffle along the circumferential direction, a plurality of threaded holes for connecting with the outer sleeve (1) are formed on the end face of the corresponding end of the outer ring (2) along the circumferential direction, each threaded hole is coaxially arranged corresponding to one connecting through hole (13), and the threaded section of each bolt extends into the corresponding threaded hole through one connecting through hole (13) and is threadedly connected with the outer ring (2).

8. The squeeze film damper based on the one-way valve oil supply structure according to claim 7, characterized in that: The one-way valve oil supply unit comprises a one-way valve shell (11) and a one-way valve (4), the one-way valve shell (11) is arranged on the outer ring wall of the outer sleeve (1) and is integrally formed with the outer sleeve (1), the one-way valve (4) is installed in the one-way valve shell (11), the top of the one-way valve shell (11) is processed with an oil inlet hole (12) for communicating with an external oil source, the one-way valve shell (11) is processed with an oil passing hole corresponding to the oil passing hole (21) and a supplementary cavitation channel (111) corresponding to the circumferential oil groove (23), the one-way valve (4) is used for introducing the oil input by the external oil source into the oil passing hole or the supplementary cavitation channel (111), and meanwhile, the one-way valve (4) prevents the high-pressure lubricating oil in the extrusion oil film damper from flowing back.

9. The squeeze film damper based on the one-way valve oil supply structure according to claim 8, characterized in that: An electromagnet (5) is installed in the one-way valve shell (11) and is used for adsorbing and fixing the one-way valve (4).

10. The squeeze film damper based on the one-way valve oil supply structure according to claim 9, characterized in that: The one-way valve (4) comprises a top cylinder (41) and a conical valve core (42), the top cylinder (41) is coaxially arranged above the conical valve core (42) and is fixedly connected with the conical valve core (42) through a connecting rod, the top cylinder (41) is located in the oil inlet hole (12) and is correspondingly matched with the supplementary cavitation channel (111), the conical valve core (42) is located in the one-way valve shell (11) and is correspondingly matched with the oil passing hole, and a plurality of oil holes are equidistantly processed on the top of the top cylinder (41) in the circumferential direction, and a plurality of oil passing grooves are equidistantly processed on the outer wall of the conical valve core (42) in the circumferential direction.

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