阅读说明：本技术 一种具有减振耐温功能的航空发动机双联卡箍 (Aero-engine duplex clamp with vibration-damping temperature-resistant function ) 是由 马辉 陆鹏旭 邹泽煜 徐鹤松 闫兴华 李丹丹 张郡纹 高智江 胡晓岳 孙伟 汪博 于 2021-07-19 设计创作，主要内容包括：本发明属于机械领域,具体涉及一种具有减振耐温功能的航空发动机双联卡箍。本发明的技术方案如下：一种具有减振耐温功能的航空发动机双联卡箍,包括卡箍上半部和卡箍下半部,卡箍上半部和卡箍下半部通过螺栓连接在一起；卡箍上半部包括两个半圆形外壳及两个半圆形外壳之间的上连接部,卡箍下半部包括两个半圆形外壳及两个半圆形外壳之间的下连接部；四个半圆形外壳内设有多功能层合结构,上连接部设有上部磁流变液储液结构,下连接部设有下部磁流变液储液结构,上部磁流变液储液结构与下部磁流变液储液结构相连通。本发明提供的具有减振耐温功能的航空发动机双联卡箍,利用磁流变液和压电复合材料,采用主被动减振方式,设有多层隔热层,取得良好的减振耐温效果。(The invention belongs to the field of machinery, and particularly relates to an aircraft engine duplex hoop with vibration reduction and temperature resistance functions. The technical scheme of the invention is as follows: an aircraft engine duplex hoop with vibration reduction and temperature resistance functions comprises an upper hoop half part and a lower hoop half part, wherein the upper hoop half part and the lower hoop half part are connected together through bolts; the upper half part of the hoop comprises two semicircular shells and an upper connecting part between the two semicircular shells, and the lower half part of the hoop comprises two semicircular shells and a lower connecting part between the two semicircular shells; the four semi-circular shells are internally provided with multifunctional laminated structures, the upper connecting parts are provided with upper magnetorheological fluid liquid storage structures, the lower connecting parts are provided with lower magnetorheological fluid liquid storage structures, and the upper magnetorheological fluid liquid storage structures are communicated with the lower magnetorheological fluid liquid storage structures. The aircraft engine duplex hoop with the vibration-damping and temperature-resistant functions utilizes magnetorheological fluid and a piezoelectric composite material, adopts an active and passive vibration-damping mode, and is provided with a plurality of heat-insulating layers, so that good vibration-damping and temperature-resistant effects are achieved.)

1. The duplex hoop of the aero-engine with the functions of vibration reduction and temperature resistance is characterized by comprising an upper hoop half part and a lower hoop half part, wherein the upper hoop half part and the lower hoop half part are connected together through bolts; the upper half part of the hoop comprises two semicircular shells and an upper connecting part between the two semicircular shells, and the lower half part of the hoop comprises two semicircular shells and a lower connecting part between the two semicircular shells; the four semi-circular shells are internally provided with multifunctional laminated structures, the upper connecting parts are provided with upper magnetorheological fluid liquid storage structures, the lower connecting parts are provided with lower magnetorheological fluid liquid storage structures, and the upper magnetorheological fluid liquid storage structures are communicated with the lower magnetorheological fluid liquid storage structures.

2. The aircraft engine duplex hoop with the functions of vibration reduction and temperature resistance according to claim 1, wherein the multifunctional laminated structure comprises an alloy rubber hybrid layer, an asbestos heat-resistant layer, a heat-resistant polyurethane passive vibration-damping layer, a piezoelectric fiber composite material layer, a magnetorheological fluid shell layer wound around a copper coil and an insulating layer which are sequentially distributed, the semicircular shell is of an arc-shaped hollow structure, the insulating layer is adhered to the inner wall of the semicircular shell, and the alloy rubber hybrid layer is located on the outermost layer and is used for being in direct contact with a pipeline of an aircraft engine.

3. The aircraft engine duplex hoop with the functions of vibration reduction and temperature resistance according to claim 2, wherein the alloy rubber hybrid layer is formed by combining a plurality of titanium metal thin layers and a plurality of temperature-resistant rubber thin layers, the side, in contact with the pipeline, of the alloy rubber hybrid layer is of a gear-like structure, and the side, in cooperation with the asbestos heat-resistant layer, of the alloy rubber hybrid layer is of a corrugated structure.

4. The duplex band with vibration and temperature resistant functions of claim 2, wherein the asbestos thermal barrier layer is made of a single asbestos material, and the inner and outer sides of the asbestos thermal barrier layer are corrugated.

5. The aircraft engine duplex clip with the vibration-damping and temperature-resistant functions as claimed in claim 2, wherein the heat-resistant polyurethane passive vibration-damping layer is made of a single polyurethane material, and one side of the heat-resistant polyurethane passive vibration-damping layer, which is in contact with the asbestos heat-resistant layer, is of a corrugated structure, and the other side of the heat-resistant polyurethane passive vibration-damping layer is of a smooth circular arc-shaped structure.

6. The aircraft engine duplex clip with the vibration-damping and temperature-resistant functions of claim 2 is characterized in that the piezoelectric fiber composite material layer is pasted on the heat-resistant polyurethane passive vibration-damping layer.

7. The aircraft engine duplex clip with the functions of vibration reduction and temperature resistance according to claim 2, wherein the magnetorheological fluid shell layer wound around the copper coil comprises a magnetorheological fluid shell and copper coils, protrusions are arranged outside the magnetorheological fluid shell at intervals, and the copper coils are wound among the protrusions.

8. The aircraft engine duplex clip with the functions of vibration reduction and temperature resistance according to claim 7, wherein the upper magnetorheological fluid liquid storage structure comprises a first liquid storage tank, a first sealing cover and two miniature rotary impeller liquid draining devices, the first sealing cover is positioned on one side in contact with the lower magnetorheological fluid liquid storage structure, the first sealing cover is fixedly connected with the upper connecting part to seal the first liquid storage tank, and the first sealing cover is provided with two flow-through nozzles; the two miniature rotary impeller liquid drainage devices are respectively positioned at the left side and the right side of the liquid storage tank and face the liquid inlet of the magnetorheological fluid shell.

9. The aircraft engine duplex hoop with the vibration-damping and temperature-resistant functions as claimed in claim 8, wherein the lower magnetorheological fluid liquid storage structure comprises a second liquid storage tank, a second sealing cover, a miniature liquid pump and two miniature rotary impeller liquid draining devices, the second sealing cover is located on one side in contact with the upper magnetorheological fluid storage structure, the second sealing cover is fixedly connected with the lower connecting portion to seal the second liquid storage tank, and two circulation holes are formed in the second sealing cover and used for being installed in a matched mode with the circulation nozzles; the two miniature rotary impeller liquid drainage devices are respectively positioned at the left side and the right side of the liquid storage tank II and face the liquid inlet of the magnetorheological fluid shell; the miniature liquid pump is arranged in the second liquid storage tank and communicated with the four magnetorheological fluid shells through pipelines.

10. The aircraft engine duplex hoop with the vibration-damping and temperature-resistant functions according to claim 9, wherein the micro liquid pump and the micro rotary impeller draining device are controlled by a master control system, and when a vibration signal sensed by the piezoelectric fiber composite material layer is greater than a preset critical value, the micro rotary impeller draining device works to drain magnetorheological fluid in the first liquid storage tank and the second liquid storage tank into the magnetorheological fluid shell, so that the magnetorheological effect is enhanced, and the active vibration-damping effect is improved; when the vibration signal sensed by the piezoelectric fiber composite material layer is smaller than a preset critical value, the micro liquid pump works to suck the magnetorheological fluid in the magnetorheological fluid shell into the second liquid storage tank, and after the second liquid storage tank is filled, the pumped magnetorheological fluid enters the first liquid storage tank, so that the magnetorheological effect is weakened, and the preparation is prepared for subsequent active vibration reduction.

Technical Field

The invention belongs to the field of machinery, and particularly relates to an aircraft engine duplex hoop with vibration reduction and temperature resistance functions.

Background

The performance of an aircraft engine hoop serving as a part used in a large amount in a pipeline system influences the reliability of the whole equipment. The duplex clamp can receive the continuous vibration influence of fixed pipeline that it connects and the high temperature influence of the fluid that leads to in the pipeline, and this accuracy and the stability of clamp work among the aircraft engine will be influenced to this pair clamp, still can lead to the clamp to appear fatigue failure and shorten life or lead to the clamp structure to appear damaging when serious. Therefore, it is necessary that the duplex hoop of the aircraft engine has good vibration damping and temperature resistance functions.

Nowadays, some of the hoop structures available on the market are designed by engineers to be partly vibration damping or temperature resistant structures or to have similar functions, but all have some problems. For example, patent CN101915334A and patent CN110425368A propose two methods for manufacturing an elastic clamp, which respectively use a specially-made enhanced elastic pad to improve the strength and damping and buffering performance of the clamp, but because an additional passive damping and damping material is used, the vibration suppression effect of the clamp cannot be flexibly adjusted according to the working environments of the clamp and the pipeline; in addition, the vibration damping effect of the passive damping material is difficult to ensure the reduction of the vibration damping effect after long-time use and the degradation of the material performance. The patent CN110822208A utilizes metal rubber to design a vibration-damping hoop structure suitable for a rocket large-caliber pipeline, and the design method improves the vibration-damping effect to a certain extent, but only further enhances the vibration-damping performance of a passive vibration-damping structure, and still does not solve the fundamental defects of the vibration-damping means. Patent CN210484919U utilizes the special structure of the designed collar lining plate to reduce the contact area with the pipeline and reduce the heat conduction, but it does not adopt other methods to further heat insulation treatment, and still has a large amount of heat which can not be insulated. Patent CN204785165U utilizes metal rubber, has designed a high temperature resistance elasticity clamp, utilizes metal rubber's heat resistance to reach high temperature resistance effect, nevertheless only pastes one deck metal rubber in the clamp inside and hardly reaches fine temperature resistant effect. Patent CN210800250U and patent CN210510122U utilize spring, wire rope or metal rubber that alloy material made as inner liner structure, have designed the clamp that has damping temperature resistant function, can only passive mode damping, and the spring itself can only absorb low frequency vibration energy, can't guarantee the damping effect in the wide band within range.

Disclosure of Invention

The invention provides an aircraft engine duplex hoop with vibration-damping and temperature-resistant functions, which utilizes magnetorheological fluid and a piezoelectric composite material, adopts an active and passive vibration-damping mode and is provided with a plurality of heat-insulating layers, thereby obtaining good vibration-damping and temperature-resistant effects.

The technical scheme of the invention is as follows:

an aircraft engine duplex hoop with vibration reduction and temperature resistance functions comprises an upper hoop half part and a lower hoop half part, wherein the upper hoop half part and the lower hoop half part are connected together through bolts; the upper half part of the hoop comprises two semicircular shells and an upper connecting part between the two semicircular shells, and the lower half part of the hoop comprises two semicircular shells and a lower connecting part between the two semicircular shells; the four semi-circular shells are internally provided with multifunctional laminated structures, the upper connecting parts are provided with upper magnetorheological fluid liquid storage structures, the lower connecting parts are provided with lower magnetorheological fluid liquid storage structures, and the upper magnetorheological fluid liquid storage structures are communicated with the lower magnetorheological fluid liquid storage structures.

Furthermore, the aircraft engine duplex clamp with vibration-damping and temperature-resistant functions comprises an alloy rubber hybrid layer, an asbestos heat-resistant layer, a heat-resistant polyurethane passive vibration-damping layer, a piezoelectric fiber composite material layer, a magnetorheological fluid shell layer wound with a copper coil and an insulating layer which are sequentially distributed, wherein the semicircular shell is of an arc-shaped hollow structure, the insulating layer is adhered to the inner wall of the semicircular shell, and the alloy rubber hybrid layer is positioned on the outermost layer and is used for being in direct contact with a pipeline of an aircraft engine.

Furthermore, the aircraft engine duplex clamp with the functions of vibration reduction and temperature resistance is characterized in that the alloy rubber mixed layer is formed by combining a plurality of titanium metal thin layers and a plurality of temperature-resistant rubber thin layers, one side, in contact with a pipeline, of the alloy rubber mixed layer is of a similar gear structure, and one side, in cooperation with the asbestos heat-resistant layer, of the alloy rubber mixed layer is of a corrugated structure.

Furthermore, the duplex hoop of the aircraft engine with the functions of vibration reduction and temperature resistance is characterized in that the asbestos heat-resistant layer is made of a single asbestos material, and the inner side and the outer side of the asbestos heat-resistant layer are both of a corrugated structure.

Furthermore, the aircraft engine duplex clamp with vibration and temperature resistant functions, the heat-resistant polyurethane passive vibration damping layer is made of a single polyurethane material, one side of the heat-resistant polyurethane passive vibration damping layer, which is in contact with the asbestos heat resistant layer, is of a corrugated structure, and the other side of the heat-resistant polyurethane passive vibration damping layer is of a smooth circular arc-shaped structure.

Further, aeroengine pair clamp with damping temperature resistant function, the piezoelectric fiber composite material layer is pasted on the passive damping layer of heat-resisting polyurethane.

Furthermore, the aircraft engine duplex hoop with vibration-damping and temperature-resistant functions, the magnetorheological fluid shell layer wound with the copper coil comprises a magnetorheological fluid shell and the copper coil, bulges are arranged outside the magnetorheological fluid shell at intervals, and the copper coil is wound among the bulges.

Furthermore, the aircraft engine duplex hoop with the vibration-damping and temperature-resistant functions comprises an upper magnetorheological fluid liquid storage structure, a first sealing cover and two miniature rotary impeller liquid drainage devices, wherein the first sealing cover is positioned on one side in contact with the lower magnetorheological fluid liquid storage structure, the first sealing cover is fixedly connected with an upper connecting part to seal the first liquid storage structure, and two circulation nozzles are arranged on the first sealing cover; the two miniature rotary impeller liquid drainage devices are respectively positioned at the left side and the right side of the liquid storage tank and face the liquid inlet of the magnetorheological fluid shell.

Furthermore, the aeroengine duplex hoop with the vibration-damping and temperature-resistant functions comprises a lower magnetorheological fluid liquid storage structure, a second sealing cover, a miniature liquid pump and two miniature rotary impeller liquid drainage devices, wherein the second sealing cover is positioned on one side in contact with the upper magnetorheological fluid liquid storage structure, the second sealing cover is fixedly connected with the lower connecting part to seal the second liquid storage structure, and two circulation holes are formed in the second sealing cover and used for being matched with the circulation nozzles; the two miniature rotary impeller liquid drainage devices are respectively positioned at the left side and the right side of the liquid storage tank II and face the liquid inlet of the magnetorheological fluid shell; the miniature liquid pump is arranged in the second liquid storage tank and communicated with the four magnetorheological fluid shells through pipelines.

Furthermore, the aero-engine duplex hoop with the vibration-damping and temperature-resistant functions is characterized in that the micro liquid pump and the micro rotary impeller liquid drainage device are controlled by a master control system, and when a vibration signal sensed by the piezoelectric fiber composite material layer is greater than a preset critical value, the micro rotary impeller liquid drainage device works to discharge magnetorheological fluid in the first liquid storage tank and the second liquid storage tank into the magnetorheological fluid shell, so that the magnetorheological effect is enhanced, and the active vibration-damping effect is improved; when the vibration signal sensed by the piezoelectric fiber composite material layer is smaller than a preset critical value, the micro liquid pump works to suck the magnetorheological fluid in the magnetorheological fluid shell into the second liquid storage tank, and after the second liquid storage tank is filled, the pumped magnetorheological fluid enters the first liquid storage tank, so that the magnetorheological effect is weakened, and the preparation is prepared for subsequent active vibration reduction.

The invention has the beneficial effects that:

1. the temperature-resistant rubber thin layer has certain elasticity, and the titanium metal thin layer has excellent heat resistance, so that the whole alloy rubber mixed layer has the functions of vibration reduction and high temperature resistance; one side of the alloy rubber mixed layer contacting the pipeline is designed into a gear-like structure, so that the contact area of the pipeline can be reduced, and the heat conduction is reduced; one side of the alloy rubber mixing layer matched with the asbestos heat-resistant layer is designed to be corrugated to prevent the displacement phenomenon.

2. The asbestos heat-resistant layer is made of a single asbestos material and can prevent heat transfer; the inner side and the outer side of the asbestos heat-resistant layer are both designed into a corrugated shape to prevent the phenomenon of displacement.

3. The heat-resistant polyurethane passive vibration damping layer is made of a single polyurethane material, and the polyurethane has good elasticity, so that a good passive vibration damping effect can be achieved; one side of the heat-resistant polyurethane passive vibration damping layer, which is in contact with the asbestos heat-resistant layer, is designed to be corrugated to prevent the occurrence of a channeling phenomenon, and the other side of the heat-resistant polyurethane passive vibration damping layer is of a smooth circular arc structure, so that the piezoelectric fiber composite material layer can be conveniently pasted.

4. The piezoelectric fiber composite material layer is used as a vibration sensing layer and is adhered to the heat-resistant polyurethane passive vibration damping layer; when vibration occurs, the piezoelectric fiber composite material can deform due to vibration, so that the electric field of the layer changes, and the change of the electric field is transmitted to the master control system through a circuit.

5. The copper coil-wound magnetorheological fluid shell layer is an active vibration reduction execution layer, and the purpose of active vibration reduction is achieved by utilizing the magnetorheological fluid flowing in the magnetorheological fluid shell and the magnetorheological effect exerted by the magnetorheological fluid. The magnitude of current flowing in the copper coil is changed according to the magnitude of vibration sensed by the piezoelectric fiber composite material, and the magnitude of the current can cause the change of a magnetic field, so that the damping performance of the internal magnetorheological liquid is controlled, and the active vibration reduction function is realized.

6. The insulating layer aims to prevent the influence of an electric field in the magnetorheological fluid on the external working environment of the clamp; on the other hand, the shell can be prevented from conducting when the duplex clamp works, and accidents are avoided.

Drawings

FIG. 1 is a structural diagram of a duplex hoop of an aircraft engine with vibration damping and temperature resistance functions;

FIG. 2 is a schematic view of a multi-functional laminate structure;

FIG. 3 is a view showing the upper part of the clip;

FIG. 4 is a schematic view of the internal structure of the upper portion of the clamp;

fig. 5 is a view showing the lower half of the clip.

Detailed Description

As shown in fig. 1-5, an aircraft engine duplex clip with vibration damping and temperature resistance functions comprises a clip upper half part and a clip lower half part, wherein the clip upper half part comprises two semicircular shells 3 and an upper connecting part 1 between the two semicircular shells 3, and the clip lower half part comprises two semicircular shells 3 and a lower connecting part 2 between the two semicircular shells 3; the four semicircular shells 3 are internally provided with multifunctional laminated structures 5, the upper connecting parts 1 are provided with upper magnetorheological fluid liquid storage structures, the lower connecting parts 2 are provided with lower magnetorheological fluid liquid storage structures, and the upper magnetorheological fluid liquid storage structures are communicated with the lower magnetorheological fluid liquid storage structures.

The multifunctional laminated structure 5 comprises an alloy rubber mixed layer 6, an asbestos heat-resistant layer 7, a heat-resistant polyurethane passive vibration-damping layer 8, a piezoelectric fiber composite material layer 9, a copper coil-wound magnetorheological fluid shell layer and an insulating layer 12 which are sequentially distributed, the semicircular shell 3 is of an arc-shaped hollow structure, the insulating layer 12 is adhered to the inner wall of the semicircular shell 3, and the alloy rubber mixed layer 6 is located on the outermost layer and is used for being in direct contact with a pipeline of an aero-engine.

The alloy rubber mixed layer 6 is formed by combining a plurality of titanium metal thin layers and a plurality of temperature-resistant rubber thin layers, one side of the alloy rubber mixed layer 6, which is in contact with a pipeline, is of a gear-like structure, and one side of the alloy rubber mixed layer 6, which is matched with the asbestos heat-resistant layer 7, is of a corrugated structure.

The asbestos heat-resistant layer 7 is made of a single asbestos material, and the inner side and the outer side of the asbestos heat-resistant layer 7 are both of a corrugated structure.

The heat-resistant polyurethane passive vibration damping layer 8 is made of a single polyurethane material, one side of the heat-resistant polyurethane passive vibration damping layer 8, which is in contact with the asbestos heat-resistant layer 7, is of a corrugated structure, and the other side of the heat-resistant polyurethane passive vibration damping layer is of a smooth arc-shaped structure.

The piezoelectric fiber composite material layer 9 is pasted on the heat-resistant polyurethane passive vibration damping layer 8.

The magnetorheological fluid shell layer wound with the copper coil comprises a magnetorheological fluid shell 10 and copper coils 11, wherein bulges are distributed at intervals outside the magnetorheological fluid shell 10, and the copper coils 11 are wound among the bulges.

The upper magnetorheological fluid liquid storage structure comprises a first liquid storage tank, a first sealing cover 13 and two miniature rotary impeller liquid discharging devices 19, the first sealing cover 13 is positioned on one side in contact with the lower magnetorheological fluid liquid storage structure, the first sealing cover 13 is fixedly connected with the upper connecting part 1 to seal the first liquid storage tank, and two circulation nozzles 14 are arranged on the first sealing cover 13; the two miniature rotary impeller liquid drainage devices 19 are respectively positioned at the left side and the right side of the liquid storage tank and face the liquid inlet 20 of the magnetorheological fluid shell 10.

The lower magnetorheological fluid liquid storage structure comprises a second liquid storage tank, a second sealing cover 16, a miniature liquid pump and two miniature rotary impeller liquid drainage devices 19, the second sealing cover 16 is positioned on one side in contact with the upper magnetorheological fluid liquid storage structure, the second sealing cover 16 is fixedly connected with the lower connecting part 2 to seal the second liquid storage tank, and two circulation holes 17 are formed in the second sealing cover 16 and used for being matched with the circulation nozzles 14; the two miniature rotary impeller liquid drainage devices 19 are respectively positioned at the left side and the right side of the second liquid storage tank and opposite to the liquid inlet 20 of the magnetorheological fluid shell 10; the miniature liquid pump is arranged in the second liquid storage tank and communicated with the four magnetorheological fluid shells 10 through pipelines.

The upper connecting portion 1 is provided with a first screw hole 4, the first sealing cover 13 is provided with a second screw hole 15, the second sealing cover 16 is provided with a third screw hole 18, the lower connecting portion 2 is provided with a fourth screw hole, and a bolt is screwed into the first screw hole 4, the second screw hole 15, the third screw hole 18 and the fourth screw hole to connect the upper half portion of the clamp and the lower half portion of the clamp together.

The micro liquid pump and the micro rotary impeller drainage device 19 are controlled by a master control system, when the vibration signal sensed by the piezoelectric fiber composite material layer 9 is greater than a preset critical value, the micro rotary impeller drainage device 19 works to discharge the magnetorheological fluid in the first liquid storage tank and the second liquid storage tank into the magnetorheological fluid shell 10, so that the magnetorheological effect is enhanced, and the active vibration reduction effect is improved; when the vibration signal sensed by the piezoelectric fiber composite material layer 9 is smaller than a preset critical value, the micro liquid pump works to suck the magnetorheological fluid in the magnetorheological fluid shell 10 into the second liquid storage tank, and after the second liquid storage tank is filled, the pumped magnetorheological fluid enters the first liquid storage tank, so that the magnetorheological effect is weakened, and the preparation is prepared for subsequent active vibration reduction.