An elastic support structure

Abstract

The present invention belongs to the field of aero-engines, and in particular relates to an elastic support structure, which includes an elastic support. The elastic support is installed inside the engine housing to form an elastic support for the rotor. The elastic support includes an inner ring wall and an outer ring wall that are arranged in parallel with each other. The inner ring wall and the outer ring wall are connected by a support wall and form a U-shaped structure. A variable flexible support member is arranged between the inner ring wall and the outer ring wall; a follower ring, the follower ring is installed on the inner ring of the elastic support through a ball bearing, and the follower ring is provided with an inwardly concave groove at the ball bearing. Through the U-shaped elastic support structure of the present invention, it is possible to reduce the support stiffness required by the rotor system, enable the rotor system to avoid the critical speed, thereby avoiding resonance of the rotor system, reducing the vibration of the engine, simplifying the structure, improving the vibration reduction effect, and reducing the manufacturing cost. Compared with the traditional characteristic support structure, this elastic support structure has no friction and wear and has a good vibration reduction effect.

Description

Technical Field

[0001] The present invention belongs to the field of aeroengines, and particularly relates to an elastic support structure. Background Art

[0002] The rotor components of an aeroengine are high-speed rotating devices, and the rotor speed can reach tens of thousands to hundreds of thousands of revolutions per minute. All loads of the rotor are transmitted to the engine casing through bearings and support members.

[0003] Traditional rotor components adopt a rigid connection method. In order to ensure that the critical speed is not within the engine operating speed range, it is necessary to adjust the rotor support stiffness. However, with the continuous increase in the rotor speed of the engine, it brings great difficulties to the adjustment of the critical speed. Because when the displacement of the moving component is very small, the moving speed will be very slow. If a friction pair is used, there will be a stick-slip phenomenon and relatively serious wear, while the elastic support can well solve the above problems. The elastic support has no friction and no wear, and is a very good support form for small displacements.

[0004] Common small-displacement characteristic support forms include spring support, support plate support structure, etc. The spring support has poor stability, and the support plate support structure has poor vibration damping effect. For example, an elastic support structure for an aeroengine rotor disclosed in the national patent publication number CN 215672377 U provides support in the radial direction through the first wall and the second wall, and has poor stability and vibration damping effect under high-speed operation. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems proposed in the above background art, and provide an elastic support structure.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: An elastic support structure, comprising:

[0007] An elastic support, which is installed inside the engine casing to form an elastic support for the rotor. The elastic support includes an inner ring wall and an outer ring wall arranged in parallel with each other. The inner ring wall and the outer ring wall are connected by a support wall and form a U-shaped structure. A variable flexible support member is arranged between the inner ring wall and the outer ring wall;

[0008] A follow-up ring, which is installed on the inner ring of the elastic support through a ball bearing. The follow-up ring is provided with an inwardly concave groove at the ball bearing;

[0009] Two retaining rings, which are symmetrically arranged on the inner ring side wall of the follow-up ring with respect to the groove, and the retaining rings are connected to the side wall of the groove through elastic preloading members, so that the retaining rings can axially slide along the inner wall of the follow-up ring. An annular support member is arranged inside the retaining rings.

[0010] Further, the variable flexible support member includes a first annular liquid bladder and a second annular liquid bladder. The first annular liquid bladder and the second annular liquid bladder are respectively arranged on the side walls of the inner ring wall and the outer ring wall close to each other. The first annular liquid bladder and the second annular liquid bladder are both filled with magnetorheological fluid. A shielding box is installed on the support wall, and a conductive coil is wound around the shielding box. When the conductive coil is energized, a magnetic field is generated, making the fluidity of the magnetorheological fluid decrease.

[0011] Further, a fixed cylinder is fixed on the outer side wall of the follower ring. A counterweight block is connected in the fixed cylinder through a spring. A contact head is fixed on the counterweight block. An annular electrical connection piece matching the contact head is fixed on the inner ring wall. The annular electrical connection piece is electrically connected to an external power supply, and the contact head is electrically connected to the conductive coil. When the contact head contacts the annular electrical connection piece, the conductive coil is energized.

[0012] Further, the annular support member includes an annular inner lining plate coaxially arranged within the retaining ring. The annular inner lining plate is connected to the rotor shaft through a bearing locking nut. A plurality of support elastic sheets are evenly distributed between the annular inner lining plate and the retaining ring. The support elastic sheets are connected end to end in pairs and jointly enclose a sealed cavity with the retaining ring and the annular inner lining plate. Adjacent sealed cavities are connected through a communication pipe. The sealed cavity is filled with aviation hydraulic oil.

[0013] Further, support spokes are evenly distributed between the inner ring wall and the outer ring wall.

[0014] Further, an external hexagonal bolt is arranged on the outer ring of the elastic support, and a angular external tongue stop washer is arranged below the external hexagonal bolt.

[0015] Compared with the existing technology, the advantages of this elastic support structure are as follows:

[0016] 1. By setting the elastic support in the present invention, the continuously changing pressure generated by the high-speed rotor is buffered by the elastic deformation of the elastic support and the support spokes. This U-shaped elastic support structure can not only reduce the support stiffness required by the rotor system, enable the rotor system to avoid the critical speed, thereby avoiding resonance of the rotor system and reducing the vibration of the engine, but also simplify the structure, improve the vibration damping effect, and reduce the manufacturing cost. Compared with the traditional characteristic support structure, this elastic support structure has no friction and wear, has a simple structure, good vibration damping effect, and low cost;

[0017] When the elastic support deforms, the first annular liquid bladder and the second annular liquid bladder are extruded through the inner ring wall and the outer ring wall, which can further improve the vibration damping effect.

[0018] 2. The present invention sets an annular power connection piece, a contact head, and a conductive coil. As the rotational speed of the engine rotor continuously increases and exceeds the critical speed, under the action of centrifugal force, the annular power connection piece and the contact head come into contact, and the conductive coil is energized to generate a magnetic field. The magnetorheological fluid reduces its fluidity under the action of the magnetic field to reduce the vibration amplitude of the engine rotor in the high-speed rotation state.

[0019] 3. The present invention sets a retaining ring and an elastic preloading member to buffer the axial force of the engine rotor and improve its structural stability in the high-speed operation state.

[0020] 4. The present invention sets an annular inner lining plate and a support spring piece. The support spring piece can radially support and buffer the engine rotor. When the support spring piece is deformed under pressure, it squeezes the aviation hydraulic oil to flow through the connecting pipe in each closed cavity, consuming the radial vibration energy of the engine rotor and further improving the vibration damping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of an elastic support structure provided by the present invention;

[0022] Figure 2 is Figure 1 the enlarged view at A in

[0023] Figure 3 is Figure 1 the enlarged view at B in

[0024] Figure 4 is Figure 1 the enlarged view at C in

[0025] Figure 5 is a schematic front view of an annular support member in an elastic support structure provided by the present invention.

[0026] In the figure, 1 is an elastic support, 11 is an inner ring wall, 12 is an outer ring wall, 13 is a support wall, 14 is a variable flexible support member, 141 is a first annular liquid sac, 142 is a second annular liquid sac, 143 is a shielding box, 144 is a conductive coil, 2 is a follower ring, 21 is a ball bearing, 22 is a groove, 3 is a retaining ring, 31 is an elastic preloading member, 32 is an annular support member, 321 is an annular inner lining plate, 322 is a bearing locking nut, 323 is a support spring piece, 324 is a closed cavity, 325 is a connecting pipe, 4 is a fixed cylinder, 41 is a spring, 42 is a counterweight, 43 is a contact head, 44 is an annular power connection piece, 5 is a support spoke, and 6 is an external hexagonal bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following embodiments are only for illustrative purposes and are not intended to limit the scope of the present invention.

[0028] As Figures 1-5As shown, an elastic support structure includes: an elastic support 1, a follower ring 2, and two retaining rings 3.

[0029] The elastic support 1 is installed inside the engine housing to elastically support the rotor. The elastic support 1 includes an inner ring wall 11 and an outer ring wall 12 arranged in parallel. The inner ring wall 11 and the outer ring wall 12 are connected by a support wall 13 and form a U-shaped structure. Support spokes 5 are evenly distributed between the inner ring wall 11 and the outer ring wall 12. An external hexagon bolt 6 is provided on the outer ring of the elastic support 1, and a angular external tongue stop washer is provided below the external hexagon bolt 6. The elastic deformation of the elastic support 1 and the support spokes 5 is used to buffer the continuously changing pressure generated by the high-speed rotor. This U-shaped elastic support structure can not only reduce the support stiffness required by the rotor system, enable the rotor system to avoid the critical speed, thereby preventing the rotor system from resonating, reducing the vibration of the engine, but also simplify the structure, improve the vibration damping effect, and reduce the manufacturing cost. Compared with the traditional characteristic support structure, this elastic support structure has no friction and wear, is simple in structure, has a good vibration damping effect, and has a lower cost.

[0030] A variable flexible support member 14 is provided between the inner ring wall 11 and the outer ring wall 12. The variable flexible support member 14 includes a first annular liquid chamber 141 and a second annular liquid chamber 142. The first annular liquid chamber 141 and the second annular liquid chamber 142 are respectively arranged on the side walls of the inner ring wall 11 and the outer ring wall 12 close to each other. Magnetorheological fluid is filled in both the first annular liquid chamber 141 and the second annular liquid chamber 142. Magnetorheological fluid is a new type of fluid with controllable fluidity, which is a suspension formed by micron-sized or nano-sized ferromagnetic particles immersed in a non-magnetic carrier liquid. It exhibits the characteristics of a Newtonian fluid with low viscosity when there is no external magnetic field, and exhibits a Bingham fluid with high viscosity and low fluidity when an external magnetic field is applied. A shielding box 143 is installed on the support wall 13, and a conductive coil 144 is wound inside the shielding box 143. When the conductive coil 144 is energized, a magnetic field is generated, making the fluidity of the magnetorheological fluid decrease. When the elastic support 1 deforms, the first annular liquid chamber 141 and the second annular liquid chamber 142 are squeezed by the inner ring wall 11 and the outer ring wall 12, which can further improve the vibration damping effect. The role of the shielding box 143 makes the magnetic field direction of the conductive coil 144 more directional to improve the influence of the magnetic field on the magnetorheological fluid.

[0031] The follower ring 2 is installed on the inner ring of the elastic support 1 through a ball bearing 21, and the follower ring 2 is provided with an inwardly recessed groove 22 at the position of the ball bearing 21;

[0032] A fixed cylinder 4 is fixed on the outer side wall of the outer ring of the follower ring 2. A counterweight 42 is connected in the fixed cylinder 4 through a spring 41. A contact head 43 is fixed on the counterweight 42. An annular electrical contact piece 44 matching the contact head 43 is fixed on the inner ring wall 11. The annular electrical contact piece 44 is electrically connected to an external power supply. The contact head 43 is electrically connected to the conductive coil 144. When the spring 41 is in its natural state, the contact head 43 does not contact the annular electrical contact piece 44. When the elastic support 1 deforms, the first annular liquid sac 141 and the second annular liquid sac 142 are squeezed through the inner ring wall 11 and the outer ring wall 12, which can further improve the vibration damping effect. As the rotational speed of the engine rotor continuously increases and exceeds the critical rotational speed, under the action of centrifugal force, the counterweight 42 stretches the spring 41, causing the annular electrical contact piece 44 and the contact head 43 to contact. The conductive coil 144 is energized to generate a magnetic field, and the magnetorheological fluid reduces its fluidity under the action of the magnetic field to reduce the vibration amplitude of the engine rotor in the high-speed rotation state.

[0033] The two retaining rings 3 are symmetrically arranged on the inner side wall of the follower ring 2 with respect to the groove 22, and the retaining ring 3 is connected to the side wall of the groove 22 through an elastic preloading member 31, so that the retaining ring 3 can axially slide along the inner wall of the follower ring 2 to buffer the axial force of the engine rotor and improve its structural stability in the high-speed operation state.

[0034] An annular support member 32 is arranged inside the retaining ring 3. The annular support member 32 includes an annular inner lining plate 321 coaxially arranged inside the retaining ring 3. The annular inner lining plate 321 is connected to the rotor shaft through a bearing locking nut 322. During operation, the annular inner lining plate 321, the retaining ring 3 and the follower ring 2 rotate synchronously with the engine rotor shaft. A number of support elastic pieces 323 are evenly distributed between the annular inner lining plate 321 and the retaining ring 3. The support elastic pieces 323 are connected end to end in pairs and jointly enclose a sealed cavity 324 with the retaining ring 3 and the annular inner lining plate 321. Adjacent sealed cavities 324 are connected through a connecting pipe 325. The sealed cavity 324 is filled with aviation hydraulic oil. The engine rotor can be radially supported and buffered through the support elastic pieces 323. When the support elastic pieces 323 are compressed and deformed, they squeeze the aviation hydraulic oil to flow in each sealed cavity 324 through the connecting pipe 325, consuming the radial vibration energy of the engine rotor and further improving the vibration damping effect.

[0035] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An elastic support structure, characterized in that: include: An elastic support (1), the elastic support (1) being installed on the inner side of the engine housing and used to form an elastic support for the rotor, the elastic support (1) comprising an inner ring wall (11) and an outer ring wall (12) arranged parallel to each other, the inner ring wall (11) and the outer ring wall (12) being connected by a supporting wall (13) to form a U-shaped structure, and a variable flexible support member (14) being provided between the inner ring wall (11) and the outer ring wall (12); A follower ring (2), the follower ring (2) being mounted on the inner ring of the elastic support (1) via a ball bearing (21), and the follower ring (2) being provided with an inwardly recessed groove (22) at the ball bearing (21); Two retaining rings (3) are symmetrically arranged on the inner ring side wall of the follower ring (2) with respect to the groove (22), and the retaining rings (3) are connected to the side wall of the groove (22) through an elastic preload member (31), so that the retaining rings (3) can slide axially along the inner wall of the follower ring (2), and an annular support member (32) is arranged inside the retaining ring (3).

2. The elastic supporting structure according to claim 1, characterized in that: The variable flexible support member (14) includes a first annular liquid sac (141) and a second annular liquid sac (142). The first annular liquid sac (141) and the second annular liquid sac (142) are respectively arranged on the side walls of the inner ring wall (11) and the outer ring wall (12) close to each other. The first annular liquid sac (141) and the second annular liquid sac (142) are both filled with magnetorheological fluid. A shielding box (143) is installed on the support wall (13). A conductive coil (144) is wound in the shielding box (143). When the conductive coil (144) is energized, a magnetic field is generated, so that the fluidity of the magnetorheological fluid is reduced.

3. The elastic supporting structure according to claim 2, characterized in that: A fixed cylinder (4) is fixed on the outer ring side wall of the follower ring (2), a counterweight (42) is connected to the fixed cylinder (4) via a spring (41), a contact head (43) is fixed on the counterweight (42), and an annular power connection piece (44) matching the contact head (43) is fixed on the inner ring wall (11), the annular power connection piece (44) is electrically connected to an external power supply, and the contact head (43) is electrically connected to a conductive coil (144). When the contact head (43) contacts the annular power connection piece (44), the conductive coil (144) is energized.

4. The elastic supporting structure according to claim 1, characterized in that: The annular support member (32) comprises an annular inner lining plate (321) coaxially arranged in the retaining ring (3); the annular inner lining plate (321) is connected to the rotor shaft via a bearing locking nut (322); a plurality of supporting springs (323) are evenly distributed between the annular inner lining plate (321) and the retaining ring (3); the supporting springs (323) are connected end to end in a group of two and together with the retaining ring (3) and the annular inner lining plate (321) form a closed cavity (324); adjacent closed cavities (324) are connected via a connecting pipe (325); and the closed cavity (324) is filled with aviation hydraulic oil.

5. The elastic supporting structure according to claim 1, characterized in that: Support spokes (5) are evenly distributed between the inner ring wall (11) and the outer ring wall (12).

6. The elastic supporting structure according to claim 1, characterized in that: An outer hexagonal bolt (6) is provided on the outer ring of the elastic support (1), and an angular outer tongue stop washer is provided below the outer hexagonal bolt (6).

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