CN113565792B - Elastic supporting structure - Google Patents

Elastic supporting structure Download PDF

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Publication number
CN113565792B
CN113565792B CN202110825276.3A CN202110825276A CN113565792B CN 113565792 B CN113565792 B CN 113565792B CN 202110825276 A CN202110825276 A CN 202110825276A CN 113565792 B CN113565792 B CN 113565792B
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China
Prior art keywords
cage
adjusting ring
adjusting
rod
cage plate
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CN202110825276.3A
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Chinese (zh)
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CN113565792A (en
Inventor
邢广鹏
王子尧
张亚华
贾志刚
刘鑫
王则皓
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China Aero Engine Research Institute
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China Aero Engine Research Institute
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Priority to CN202110825276.3A priority Critical patent/CN113565792B/en
Publication of CN113565792A publication Critical patent/CN113565792A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/20—Mounting rotors on shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/266—Rotors specially for elastic fluids mounting compressor rotors on shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/601—Mounting; Assembling; Disassembling specially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/605—Mounting; Assembling; Disassembling specially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
    • Y02A40/81—Aquaculture, e.g. of fish

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vibration Prevention Devices (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The present disclosure provides an elastic support structure, comprising a cage and a stiffness adjustment device, the stiffness adjustment device comprising an adjustment ring and a drive module, the adjustment ring being supported on the cage and dividing the cage into a first portion and a second portion along an axial direction thereof; the driving module is connected with the adjusting ring and is used for driving the adjusting ring to move along the axial direction of the cage net so as to change the axial length of the first part and the axial length of the second part. The elastic support structure of the present disclosure avoids the rotor system from resonating by providing the rotor with an elastic support of variable stiffness, which avoids critical rotational speeds of the rotor system.

Description

Elastic supporting structure
Technical Field
The present disclosure relates to support structures, and more particularly to an elastic support structure.
Background
The high-speed rotor belongs to a flexible rotor, and the working rotating speed is higher than the critical rotating speed, so that the high-speed rotor must pass through the critical rotating speed in the process of reaching the working state, and the rotor system resonates to influence the performance of the rotor system, so that the resonance of the rotor system needs to be controlled.
BRIEF SUMMARY OF THE PRESENT DISCLOSURE
In order to solve the above technical problems, the present disclosure provides an elastic supporting structure, which provides an elastic supporting with variable rigidity for a rotor, so as to avoid a critical rotation speed of the rotor system, thereby avoiding resonance of the rotor system.
The technical scheme of the invention is realized as follows:
an elastic support structure comprising a cage and a stiffness adjustment device, the stiffness adjustment device comprising an adjustment ring and a drive module, the adjustment ring being supported on the cage and dividing the cage into a first portion and a second portion along its axial direction; the driving module is connected with the adjusting ring and is used for driving the adjusting ring to move along the axial direction of the cage net so as to change the axial length of the first part and the axial length of the second part.
In one embodiment, the driving module comprises a driving device and an adjusting rod, wherein the driving device is connected with the adjusting ring through the adjusting rod and is used for driving the adjusting rod to move so that the adjusting rod drives the adjusting ring to axially move.
In one embodiment, the adjusting rod is a screw, the adjusting ring is provided with a screw hole matched with the screw, and the screw passes through the screw hole; the driving device is connected with one end of the screw rod and is used for driving the screw rod to do rotary motion.
In one embodiment, the cage net comprises a first cage plate, a second cage plate and a plurality of pull rods; the plurality of pull rods are arranged at intervals along the circumferential direction of the first cage plate and the second cage plate, and two ends of each pull rod are respectively connected with the first cage plate and the second cage plate.
In one embodiment, the adjusting ring is provided with a plurality of first through holes at intervals along the circumferential direction of the adjusting ring, each pull rod respectively penetrates through one first through hole, and the adjusting ring can move along the axial direction of the pull rod.
In one embodiment, the first cage plate and the second cage plate are both provided with second through holes, and two ends of the adjusting rod respectively penetrate through the second through holes of the first cage plate and the second cage plate.
In one embodiment, a plurality of the tie rods are arranged at equal intervals.
In one embodiment, the drive means comprises a motor.
In one embodiment, the drive means comprises a hydraulic drive mechanism.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
FIG. 1 is a schematic view of a resilient support structure of the present disclosure;
FIG. 2 is a schematic diagram of a variable stiffness process curve;
FIG. 3 is a schematic view of a part of the structure of the stiffness adjustment device of the elastic support structure;
FIG. 4 is a schematic view of a portion of the structure of the resilient support;
FIGS. 5A-5E are displacement clouds resulting from finite element simulations of an elastic support structure in which the adjusting ring is in different positions;
FIG. 6 is a schematic view of the spring support stiffness change curve with the adjustment ring in different positions.
Detailed Description
The present disclosure is described in further detail below with reference to the drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant content and not limiting of the present disclosure. It should be further noted that, for convenience of description, only a portion relevant to the present disclosure is shown in the drawings.
In addition, embodiments of the present disclosure and features of the embodiments may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, 3 and 4, the present embodiment provides an elastic support structure comprising a cage 1 and a stiffness adjustment device 2, the stiffness adjustment device 2 comprising an adjustment ring 21 and a drive module 22, the adjustment ring 21 being supported on the cage 1 and dividing the cage 1 into a first portion 1A and a second portion 1B along its axial direction; the driving module 22 is connected to the adjusting ring 21 for driving the adjusting ring 21 to move in the axial direction of the cage 1 to change the axial length of the first part 1A and the second part 1B.
According to the embodiment, the rigidity adjusting device 2 is added on the basis of a traditional cage net supporting structure, the axial lengths of the first part 1A and the second part 1B are changed by changing the position of the adjusting ring 21, so that the rigidity of the first part 1A and the second part 1B is changed, the rigidity of the whole cage net 1 is changed, the critical rotating speed of a rotor system is changed, the purpose of avoiding the critical rotating speed is achieved, the critical rotating speed is far away from the working rotating speed, and resonance of the rotor system is avoided; the specific principle is as follows:
see FIG. 2, wherein n 1 、n 2 Respectively, the positions of critical rotational speeds of the rotor system at different rigidities. Under the condition that the rotor system quality is unchanged, the critical rotation speed of the system is positively related to the system rigidity; the stiffness of the rotor system can be varied by varying the stiffness of the resilient support structure. Based on this, the elastic support structure of the present embodiment changes the rigidity of the rotor system by changing the rigidity of the support structure, which is set to k when the rotor accelerates 2 System amplitude-rotation speed characteristic edge k 2 Curve movement; when the rotating speed reaches the theoretical rigidity changing point n B When the elastic support structure stiffness becomes k 1 System amplitude versus speed characteristic trailing edge K 1 The curve moves, so that the critical rotation speed of the rotor system is changed, the purpose of avoiding the critical rotation speed is achieved, and the critical rotation speed is far away from the working rotation speed, so that the rotor system is prevented from resonating.
Referring to fig. 1, 3 and 4, as a preferred implementation of the present embodiment, the cage 1 includes a first cage plate 11, a second cage plate 12 and a plurality of tie rods 13; the plurality of pull rods 13 are arranged at intervals along the circumferential direction of the first cage plate 11 and the second cage plate 12, and two ends of each pull rod 13 are respectively connected with the first cage plate 11 and the second cage plate 12. As a preferred embodiment, the plurality of pull rods 13 are arranged at equal intervals, or the plurality of pull rods 13 and the adjusting rods 222 together form a plurality of vertical rods of the cage net 1, and the plurality of vertical rods are arranged at equal intervals. All the pull rods 13, the first cage plates 11 and the second cage plates 12 enclose a cage net 1 with a cage-shaped structure, and the cage net with the structure has a simple structure, can play a good flexible supporting role on the rotor and is beneficial to the axial movement of the adjusting ring 21; in this embodiment, the adjusting ring 21 is provided with a plurality of first through holes spaced apart along the circumferential direction thereof, each of the tie rods respectively passes through one of the first through holes, and the adjusting ring 21 is axially movable along the tie rod 13. The first through hole and the pull rod 13 form a guiding function, so that the adjusting ring 21 can be ensured to move along the axial direction, radial deflection is avoided, and stability is improved.
For a cage support structure, the stiffness k is expressed as follows:
k＝3nπEd 4 /16l 3 ；
wherein l is the axial length of the cage net 1, n is the number of the pull rods 13, E is the elastic modulus of the material of the pull rods 13, and d is the diameter of the pull rods; as is evident from the above, by varying the axial length of the cage wire 1, the stiffness of the support structure of the cage wire 1 can be varied, on the basis of which the present embodiment by adding an adjusting ring to the cage wire 1, the adjusting ring 21 causes the cage wire 1 to be divided in its axial direction into two parts, a first part 1A and a second part 1B, where the stiffness of both the first part 1A and the second part 1B is related to the axial length of that part. Referring to fig. 4, the first portion 1A has an axial length l 1 The second portion 1B has an axial length l 2 The method comprises the steps of carrying out a first treatment on the surface of the By changing the bearing position of the adjusting ring 21, the stiffness of the first part 1A and the second part 1B can be changed, whereby the stiffness of the entire cage 1 is changed.
Referring to fig. 1, 3 and 4, as a preferred implementation of the present embodiment, the driving module 22 includes a driving device 221 and an adjusting rod 222, where the driving device 221 is connected to the adjusting ring 21 through the adjusting rod 222, and is used to drive the adjusting rod 222 to move, so that the adjusting rod 222 drives the adjusting ring 21 to move along the axial direction. The adjusting rod 222 may be a single-section single rod or a multi-section connecting rod, and the driving module with the structure can simply and efficiently drive the adjusting ring 21 to move along the axial direction. The driving device 221 comprises a motor or a hydraulic driving mechanism, preferably, the cage 1 is made of metal or composite material, and the adjusting ring 21 is made of metal or composite material, so as to have better rigidity and supporting capability.
Referring to fig. 1, 3 and 4, as a preferred embodiment of the present example, the adjusting rod 222 may preferably be a screw, and the adjusting ring 21 is provided with a screw hole matched with the screw, and the screw passes through the screw hole; the driving device 221 is connected with one end of the screw rod, and is used for driving the screw rod to do rotary motion, the driving module of the structure can drive the adjusting ring to move along the axial direction through the rotary motion of the screw rod by utilizing the screw rod lifting principle, at the moment, the driving device 221 drives the screw rod to do rotary motion, the axial position of the screw rod is not changed, the adjusting ring 21 can be simply and efficiently driven to move along the axial direction, the stability is good, and the overall mechanism size of the cage net 1 is hardly influenced.
Referring to fig. 1, 3 and 4, as a preferred implementation manner of this embodiment, the first cage plate 11 and the second cage plate 12 are both provided with second through holes, and two ends of the adjusting rod 222 respectively pass through the second through holes of the first cage plate 11 and the second cage plate 12, so as to play a role in radially and relatively fixing the adjusting rod 222, avoid the offset of the adjusting rod 222, and improve stability.
Fig. 5A-5E show displacement clouds obtained by finite element simulation of the elastic support structure of the present disclosure in which the adjusting ring 21 is at different positions, and fig. 6 shows elastic support stiffness change curves of the adjusting ring 21 at different positions, and as can be seen from fig. 5A-5E and fig. 6, with the elastic support structure of the present disclosure, the maximum stiffness is 2.5 times the minimum stiffness, and at the maximum stiffness, the adjusting ring 21 is at the middle position of the tie rod 13, and at the minimum stiffness, the adjusting ring is at a position close to the first cage plate 11 or the second cage plate 12.
In summary, according to the elastic supporting structure disclosed by the disclosure, the rigidity of the elastic supporting structure can be changed by changing the position of the adjusting ring 21, so that the critical rotation speed of the rotor system is changed, the purpose of avoiding the critical rotation speed is achieved, and the critical rotation speed is far away from the working rotation speed, so that the rotor system is prevented from resonating.
It should be noted that, the structure of the cage net 1 of the present disclosure is not limited to the cage net structure illustrated in the present embodiment, for example, a cage net with a net-shaped peripheral wall may be used, a pull rod is provided in the cage net, and a guiding hole sleeved on the pull rod is provided on the adjusting ring to achieve the purpose of controlling the axial movement of the adjusting ring.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
It will be appreciated by those skilled in the art that the above-described embodiments are merely for clarity of illustration of the disclosure, and are not intended to limit the scope of the disclosure. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present disclosure.

Claims (5)

1. An elastic support structure, characterized by comprising a cage and a rigidity adjusting device, wherein the rigidity adjusting device comprises an adjusting ring and a driving module, the adjusting ring is supported on the cage, and the cage is divided into a first part and a second part along the axial direction of the adjusting ring; the driving module is connected with the adjusting ring and is used for driving the adjusting ring to move along the axial direction of the cage net so as to change the axial length of the first part and the axial length of the second part;
the driving module comprises a driving device and an adjusting rod, wherein the driving device is connected with the adjusting ring through the adjusting rod and is used for driving the adjusting rod to move so that the adjusting rod drives the adjusting ring to axially move;
the adjusting rod is a screw rod, a screw hole matched with the screw rod is formed in the adjusting ring, and the screw rod penetrates through the screw hole; the driving device is connected with one end of the screw rod and is used for driving the screw rod to do rotary motion;
the cage net comprises a first cage plate, a second cage plate and a plurality of pull rods; the plurality of pull rods are arranged at intervals along the circumferential directions of the first cage plate and the second cage plate, and two ends of each pull rod are respectively connected with the first cage plate and the second cage plate;
the adjusting ring is provided with a plurality of first through holes at intervals along the circumferential direction, each pull rod respectively penetrates through one first through hole, and the adjusting ring can axially move along the pull rod.
2. The flexible support structure of claim 1, wherein said first cage plate and said second cage plate are each provided with a second through hole, and wherein both ends of said adjustment rod pass through said second through holes of said first cage plate and said second cage plate, respectively.
3. The resilient support structure of claim 1, wherein a plurality of said tie rods are equally spaced.
4. A resilient support structure according to any one of claims 1 to 3, wherein the drive means comprises an electric motor.
5. A resilient support structure according to any one of claims 1 to 3, wherein the drive means comprises a hydraulic drive mechanism.
CN202110825276.3A 2021-07-21 2021-07-21 Elastic supporting structure Active CN113565792B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110825276.3A CN113565792B (en) 2021-07-21 2021-07-21 Elastic supporting structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110825276.3A CN113565792B (en) 2021-07-21 2021-07-21 Elastic supporting structure

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CN113565792A CN113565792A (en) 2021-10-29
CN113565792B true CN113565792B (en) 2023-06-20

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114233409B (en) * 2021-12-22 2023-03-24 北京航空航天大学 Rigidity repairable supporting structure for rotor with blade loss fault

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102425639A (en) * 2011-11-30 2012-04-25 中国航空动力机械研究所 Elastic supporting structure
CN103244276B (en) * 2013-04-11 2015-09-09 北京航空航天大学 A kind of squirrel-cage SMA active variable stiffness rotor support means
CN205824035U (en) * 2016-03-24 2016-12-21 南京航空航天大学 A kind of active damping supporting of scalable rigidity and damping
CN108691893B (en) * 2017-04-10 2019-09-20 清华大学 Aero-engine and its squirrel-cage bearing arrangement
CN111412068B (en) * 2020-03-27 2021-02-12 中国科学院工程热物理研究所 Quick-response active control mechanism for rotor support rigidity
CN213419234U (en) * 2020-10-26 2021-06-11 中国航发上海商用航空发动机制造有限责任公司 Bearing elastic support of aircraft engine
CN112303183B (en) * 2020-10-31 2022-03-15 西北工业大学 Main control type spring support dry friction damper applied to aircraft engine

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