CN111089117A

CN111089117A - Flexible vibration damping bearing bush

Info

Publication number: CN111089117A
Application number: CN201911153128.0A
Authority: CN
Inventors: 袁鑫; 田俊; 许柯; 张鹏; 丁光耀; 郭立全; 薛慧聪
Original assignee: AECC Guiyang Engine Design Research Institute
Current assignee: AECC Guiyang Engine Design Research Institute
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-05-01
Anticipated expiration: 2039-11-21
Also published as: CN111089117B

Abstract

The invention belongs to the application field of rotating machinery, and particularly relates to a flexible damping bearing bush which consists of a bush outer ring, a bush inner ring, a bush main body, a damping piston and a sealing ring; the bushing comprises a bushing body, a bushing outer ring, a plurality of piston cavities, a plurality of damping holes and a plurality of piston cavities, wherein the bushing outer ring is provided with an annular hydraulic oil cavity; the damping pistons are arranged in piston cavities which are uniformly distributed in the circumferential direction, the root parts of the damping pistons are fixedly connected with the inner ring of the bushing, and the damping pistons reciprocate in the piston cavities to extrude or absorb hydraulic oil; a sealing ring is arranged between the damping piston and the piston cavity and is arranged in a sealing ring mounting groove at the upper section of the damping piston; the bushing outer ring, the bushing main body and the bushing inner ring are sequentially stacked concentrically, and a vibration damping device is further arranged between the bushing main body and the bushing inner ring.

Description

Flexible vibration damping bearing bush

Technical Field

The invention belongs to the field of application of rotary machinery, and particularly relates to a flexible vibration damping bearing bush which can reduce mechanical vibration generated in the operation process of the rotary machinery.

Background

When the rotating shaft supported on the bearing is subjected to external interference and passes through a critical rotating speed area or is in an abnormal operating state such as self-excited vibration, the rotating shaft is often operated in an unexpected high-amplitude state, and severe vibration of a machine is caused. The conventional damping measures are to add a bushing made of a flexible material on the inner side or the outer side of the bearing, and such a design has poor fatigue resistance in a severe application scene, such as a long-term high-rotation-speed running state, and the damping performance may fail due to material aging or fatigue fracture after long-term use, even the normal operation of the whole bearing is affected.

Disclosure of Invention

The purpose of the invention is as follows: the flexible vibration-damping bearing bush absorbs the energy of a rotating shaft transmitted to an external bearing through a bearing through the flexible vibration-damping bearing bush, so that the rotating shaft can be stably recovered to a normal running state, the amplitude of the rotating shaft in the whole running speed range is reduced, machinery is protected, and the occurrence of worse conditions caused by the rapid increase of unbalanced force due to the damage of parts is avoided.

The technical scheme is as follows: a flexible vibration damping bearing bush is composed of a bush outer ring, a bush inner ring, a bush main body, a vibration damping piston, a sealing ring and a vibration damping device, wherein the bush outer ring is provided with an annular hydraulic oil cavity; the damping pistons are arranged in piston cavities which are uniformly distributed in the circumferential direction, the root parts of the damping pistons are fixedly connected with the inner ring of the bushing, and the damping pistons reciprocate in the piston cavities to extrude or absorb hydraulic oil; a sealing ring is arranged between the damping piston and the piston cavity; the bushing outer ring, the bushing main body and the bushing inner ring are stacked concentrically, and a damping device is further arranged between the bushing main body and the bushing inner ring.

Preferably, on the basis of the design of the bushing, in order to further enhance the damping effect, the damping device may be a spring, a corrugated ring or the like.

The working principle of the invention is as follows: when the rotating shaft is in static or steady-state operation, the inner ring of the bushing is mainly supported on the bushing main body by the damping device, the axes of the inner ring of the bushing and the bushing main body are collinear, and the piston and the hydraulic oil in the piston cavity are in a relatively stable state; when the rotating shaft is in an abnormal operation state, the inner ring of the bushing is acted by unbalanced force of the rotating shaft, so that the axes of the inner ring of the bushing and the main body of the bushing are not collinear. The inner ring of the bushing drives the vibration reduction piston to do high-frequency reciprocating motion, and hydraulic oil is continuously extruded and absorbed by the damping hole. When the hydraulic oil passes through the damping holes at a very high speed, a large amount of impact mechanical energy is absorbed, and the mechanical energy is converted into heat energy, so that the rotating shaft is stably recovered to a normal operation state.

The beneficial technical effects are as follows: the flexible vibration damping bearing bush provided by the invention not only can be arranged at the outer side of the bearing, but also can be arranged at the inner side of the bearing; when the vibration absorber is arranged on the inner side of the bearing, the vibration energy of the rotating shaft can be directly absorbed, and when the vibration absorber is arranged on the outer side of the bearing, the vibration energy of the rotating shaft transmitted by the bearing is absorbed. The rotating shaft can be stably recovered to a normal running state, and the amplitude of the rotating shaft in the whole running speed range is reduced, so that the machine is protected, and the phenomenon that the mechanical unbalance force is increased sharply to cause worse condition due to the damage of parts is avoided; the flexible vibration damping bearing bush provided by the invention is not only suitable for high-speed bearings, but also suitable for medium and low-speed bearings, adopts a double vibration damping design, and has a better vibration damping effect.

Drawings

Figure 1 is a schematic diagram of a three-dimensional structure of the present invention,

figure 2 is a detailed view of zone I of figure 1,

figure 3 is a schematic diagram of a two-dimensional structure of the present invention,

description of numbering: 1-lining inner ring, 2-lining outer ring, 3-lining main body, 4-oil inlet, 5-oil outlet, 6-damping piston, 7-damping device, 8 sealing ring, 9-resistance hole, 10-hydraulic oil cavity and 11-sealing ring.

Detailed Description

The invention designs a flexible vibration damping bearing bush according to the principle that when hydraulic oil passes through a damping hole at a very high speed, a large amount of impact mechanical energy can be absorbed, and the mechanical energy is converted into heat energy, so that a rotating shaft is rapidly recovered to a normal operating state, the structural schematic diagram of the bush is shown in figures 1-3 and figure 1,

an annular hydraulic oil cavity is formed in the outer ring of the bushing, a plurality of piston cavities are uniformly distributed in the bushing main body along the circumferential direction, the damping holes are connecting channels of the piston cavities and hydraulic oil in the annular hydraulic oil cavity, and when the hydraulic oil in the piston cavities or the hydraulic oil cavity flows through the damping holes at a high speed, a large amount of mechanical energy is consumed and absorbed. The bushing outer ring and the bushing main body can be integrally formed or connected into a whole through other mechanical sealing. The whole bushing can be placed outside or inside the bearing according to the actual situation.

The damping pistons are arranged in piston cavities which are uniformly distributed in the circumferential direction, the root parts of the damping pistons are fixedly connected with the inner ring of the bushing, and the damping pistons can reciprocate in the piston cavities to extrude or absorb hydraulic oil. The damping piston root is connected with the bushing inner ring through a tenon type, such as a dovetail type, a pin type and a fir type; the connecting mode does not need to attach other connecting components, and the structure is simpler and more reliable.

In the sealing ring mounting groove of multilayer sealing ring installation on damping piston, each layer of sealing ring incision position was crisscross arranges, prevents revealing of hydraulic oil.

The damping device is a damping spring or an elastic wave ring and the like, is arranged on the periphery of the damping piston, is positioned between the lining inner ring and the lining main body, supports the lining inner ring on the lining main body, prevents rigid collision between the lining inner ring and the lining main body when the amplitude of the lining inner ring is too large, absorbs partial mechanical energy and reduces vibration.

And the outer ring of the bushing is provided with a plurality of oil inlets and oil outlets, and is a channel for filling and replacing hydraulic oil. In the specific implementation process, the flexible vibration damping bearing bush is determined according to the actual situation; the number and the size of oil inlet and outlet holes arranged on the outer ring of the bushing can be increased according to the actual situation, so that the hydraulic oil can be replaced in real time in the working process; the damping hole, the piston cavity, the damping piston, the sealing ring and the damping device form a damping unit, and factors such as the number, the size and the like of the damping unit can be changed according to actual conditions so as to achieve the optimal damping effect; in order to facilitate the installation of the bushing, structures for connecting other systems can be additionally arranged on the inner ring and the outer ring of the bushing respectively.

Claims

1. A flexible vibration dampening bearing insert characterized by: the bushing is composed of a bushing outer ring, a bushing inner ring, a bushing main body, a vibration reduction piston and a sealing ring; the bushing comprises a bushing body, a bushing outer ring, a plurality of piston cavities, a plurality of damping holes and a plurality of piston cavities, wherein the bushing outer ring is provided with an annular hydraulic oil cavity; the damping pistons are arranged in piston cavities which are uniformly distributed in the circumferential direction, the root parts of the damping pistons are fixedly connected with the inner ring of the bushing, and the damping pistons reciprocate in the piston cavities to extrude or absorb hydraulic oil; a sealing ring is arranged between the damping piston and the piston cavity and is arranged in a sealing ring mounting groove at the upper section of the damping piston; the bushing outer ring, the bushing main body and the bushing inner ring are sequentially stacked concentrically, and a vibration damping device is further arranged between the bushing main body and the bushing inner ring.

2. The compliant vibration damping bearing insert of claim 1 wherein: the damping means is a spring or a corrugated ring.

3. The compliant vibration damping bearing insert of claim 2 wherein: the spring or the corrugated ring is sleeved on the damping piston.

4. The compliant vibration damping bearing insert of claim 1 wherein: the number of the piston cavities is at least 4, and the piston cavities are uniformly distributed along the circumferential direction of the lining main body.

5. The compliant vibration damping bearing insert of claim 1 wherein: and a plurality of oil inlets and oil outlets are formed in the outer ring of the bushing.

6. The compliant vibration damping bearing insert of claim 1 wherein: the sealing ring is a multilayer sealing ring.

7. The compliant vibration damping bearing insert of claim 1 wherein: and structures connected with other systems are respectively additionally arranged on the inner ring and the outer ring of the bushing.