CN201093013Y - Internal groove self-lubricating movable static pressure coupled air bearing - Google Patents

Abstract

The utility model relates to an inner channel flow self-lubricating dynamic static pressure coupling gas floating bearing, which relates to the bearing technique and is a gas floating bearing of a novel structural form. The structural characteristic is that double-row pressure air supply hole is opened on a bearing body, and a nozzle throttle tangential direct gas supply structure is adopted, a supercharging conduit groove structure is opened on the inner surface of a bearing, the bearing body adopts material which has wear-resisting, thermostable and self-lubricating property, and adopts vibration-damping technical measure such as rubber rings, metal rubbers, elastic composite material and the like. The dynamic static pressure coupling gas floating bearing of the utility model not only greatly increases the ability of the floating ring bears external load and abradability of dynamic static components for short time contact, but also reduces index requirement for impurity which is contained in working medium, temperature and the like. Therefore, the gas floating bearing has simple structure, stable operation and high reliability, and further widens application range for gas floating bearing product engineer.

Description

Inner channel self-lubricating dynamic and static pressure coupling air bearing

technical field

The utility model relates to the bearing technology, which is an inner groove self-lubricating dynamic and static pressure coupling air bearing of a high-speed rotary machine air bearing.

Background technique

Air bearing is a high-tech product developed rapidly in the middle of the 20th century. Compared with conventional oily lubricated bearings (rolling bearings or oily sliding bearings), it has many good characteristics, such as high speed, high precision, and low power. It has the advantages of low energy consumption, no pollution, long life, and strong environmental adaptability. Therefore, it is widely used in national defense, energy, machine tools and medical industries, especially in the fields of high-speed rotary machinery and ultra-precision instrument technology.

At present, there are two most basic structural forms of air bearing lubrication, one is the static pressure air bearing as shown in Figure 1, and the other is the dynamic pressure air bearing as shown in Figure 2.

Whether it is a static pressure air bearing or a dynamic pressure air bearing, the principle is to rely on gas. The bearing is a bearing that uses the viscosity of the gas to increase the pressure of the gas in the gap, thereby suspending the shaft (see [Japan] Shihe Shinichi Author, translated by Han Huanchen "Pneumatic Bearings - Design, Production and Application", Aerospace Press, 1988). The advantages of these two types of air bearings are simple structure, easy maintenance, and effective application in many cases. However, due to the structural characteristics of these two types of air bearings, there are deficiencies such as high wear resistance requirements for short-term contact surfaces of moving and static parts, and material and process performances that are not easy to achieve.

Utility model content

The purpose of this utility model is to overcome the above-mentioned shortcomings of the prior art, and propose a new structural form of an air bearing with self-lubricating dynamic and static pressure coupling structure in the inner channel, so as to realize the air bearing with dynamic and static pressure coupling load.

For achieving the above object, the technical solution of the utility model is:

An inner channel self-lubricating dynamic-static pressure coupling air bearing, the two ends of the outer circle of the bearing are provided with vibration-damping elastic rings; it includes a static pressure system and a dynamic pressure system, wherein,

The static pressure system is to set a double row of pressure air supply holes through the bearing body. The nozzles of the air supply holes intersect with the inner circle of the bearing in a tangential direction, and the nozzles are evenly distributed on the surface of the inner circle of the bearing;

The dynamic pressure system is to set a pressurized runner groove on the circular surface of the bearing body. The pressurized runner groove is a groove closed around it, arranged in a figure of eight, with a distance between the inner ends and the edge of the bearing body.

In the air bearing, the bearing body is made of one of carbon graphite alloy, carbon fiber and polytetrafluoroethylene.

In the air bearing, the damping elastic ring is made of one of rubber ring, metal rubber, and elastic composite material.

In the air bearing, the bearing body and the vibration-damping elastic ring are in the structure of a fluid dynamic pressure bearing seal ring.

The bearing of the utility model not only greatly improves the wear resistance of the short-term contact surface of the dynamic and static parts, but also reduces the requirements for indicators such as impurities in the working medium and temperature, and can effectively improve the stability and reliability of the air bearing. Further broaden the application range of the air bearing.

Description of drawings

Fig. 1 is a structural schematic diagram of an existing static pressure air bearing;

Fig. 2 is a structural schematic diagram of an existing dynamic pressure air bearing;

Fig. 3 is a structural schematic diagram of the self-lubricating inner channel self-lubricating dynamic and static pressure coupling air bearing of the utility model;

Fig. 4 is a schematic diagram of the structure of the double-row floating ring pressure air supply hole of the utility model;

Fig. 5 is a schematic diagram of the nozzle throttling tangential air supply structure of the present invention.

Detailed ways

Fig. 3 is a structural schematic diagram of the inner channel self-lubricating dynamic-static pressure coupling air bearing of the present invention, wherein Fig. 3A is a schematic cross-sectional diagram of a dynamic-static pressure coupling air bearing, and Fig. 3B is a schematic diagram of an inner circular surface of a dynamic-static pressure coupling air bearing. As shown in the figure, the inner channel self-lubricating dynamic and static pressure coupling air bearing of the utility model is composed of a rotor journal 1, a bearing body 2, a pressurized channel groove 3, a damping elastic ring 4, an air supply hole 5, and an air supply hole nozzle 6 components, which include a static pressure system and a dynamic pressure system; where,

In the static pressure system, double rows of pressure air supply holes 5 are arranged through the bearing body 2. The nozzles 6 of the air supply holes 5 intersect with the inner circle of the bearing in a tangential direction, and the nozzles 6 of the air supply holes are evenly distributed on the inner surface of the bearing body 2;

In the dynamic pressure system, the pressurized flow channel groove 3 is evenly arranged on the inner surface of the bearing body 2. The pressurized flow channel groove 3 is a groove closed around it, arranged in a figure of eight, with a distance between the inner ends and a distance between the outer ends and the bearing body. 2 Edges also have a distance.

The bearing body 2 is a fluid dynamic pressure bearing seal ring, which is made of wear-resistant, high-temperature-resistant and self-lubricating materials, such as carbon graphite alloy, carbon fiber, polytetrafluoroethylene and other materials.

Both ends of the outer circle of the bearing body 2 are provided with damping elastic rings 4, and the vibration damping elastic rings 4 are made of rubber rings, metal rubber and elastic composite materials.

Please refer to Fig. 4 and Fig. 5 at the same time. The core technology of the utility model is to set up double rows of pressure air supply holes 5 in the air bearing body, and each row of pressure air supply holes 5 adopts a nozzle 6 throttling tangential air supply structure; The pressurized runner groove 3 is provided on the surface, and materials (such as carbon graphite alloy, carbon fiber, boron nitride, etc.) are used with wear resistance, high temperature resistance, high strength and solid self-lubricating properties. The principle is that according to the structural characteristics of the air bearing and the dynamic and static parts of the rotor journal 1, at the flow channel of the dynamic and static gap, the shaft is suspended by the power generated by the coupling of the fluid boost and the external air supply pressure by the rotation of the rotor journal 1. Here, double rows of pressure air supply holes 5 are provided in the bearing body 2, and the nozzle 6 is used to throttle the tangential air supply structure, which provides static pressure bearing and damping effect on the floating of the rotor; the inner surface of the floating ring is provided with a pressurized flow channel groove 3 , it uses the effect of the rotor journal 1 to drive the gas pressurization, which provides the dynamic pressure bearing effect for the floating of the rotor; according to the application conditions of the air bearing, a self-lubricating material with wear resistance and high temperature resistance is reasonably selected as the air bearing. The self-lubricating layer 7 material on the inner surface of the floating bearing effectively solves the short-term contact between the dynamic and static parts of the journal airflow groove and the friction problem of the relatively high-speed movement of the inner surface of the bearing; the damping elastic ring 4 adopts elastic rubber ring, metal rubber and elastic compound Materials and other vibration reduction technical measures further improve the stability of air bearing operation.

The technical scheme of the utility model is mainly realized through the following steps:

1. The material selection of the air bearing body 2, that is, according to the temperature, pressure and working medium of the air bearing application, reasonably select wear-resistant, high temperature resistant and self-lubricating performance materials as the material of the air bearing body;

2. The hydrodynamic and static pressure structure design of the air bearing, that is, according to the conditions of temperature, pressure and working fluid used in the air bearing, as well as the journal rotation, vortex speed and load bearing properties, reasonably determine the pressure of the pressurized channel groove 3 Pressure ratio, complete the structural design of the double-row nozzle 6 throttling tangential air supply hole 5 and the inner surface of the pressurized channel groove 3;

3. The body structure design of the air bearing, that is, according to the nature of the load borne by the air bearing, the stability requirements and the conditions of the working medium, measures such as rubber rings, metal rubber and elastic composite materials are used to complete the hydrodynamic bearing seal ring Design of structure, strength and motion stability;

4. Processing and manufacturing of air bearings, that is, according to the technical requirements of the structural design of air bearings, select equipment that can meet the precision requirements for manufacturing, processing and assembly.

Example

1. Selection of air bearing body 2: According to the air bearing application temperature T<200°C and the working medium is air under ambient pressure, carbon graphite with wear resistance, high temperature resistance and self-lubricating properties is selected as the air bearing body 2 Material.

2. The dynamic and static pressure structure design of the air bearing: according to the static load borne by the air bearing is 3 kg, and the working speed of the rotor is 38000rpm, it is determined that the double-row nozzle 6 throttles the tangential air supply hole 5 and the inner surface to set a figure-eight pressurized flow Structural design of track groove 3.

3. The structural design of the pneumatic bearing body: according to the load nature and stability requirements of the fluid dynamic sealing ring, the elastic rubber ring is used as the vibration damping elastic ring 4 to complete the design of the structure, strength and motion stability of the fluid dynamic bearing sealing ring design;

4. Processing and manufacturing of pneumatic bearings: According to the technical requirements of the structural design of the fluid dynamic sealing ring, select CNC equipment or special equipment that can meet the precision requirements for manufacturing, processing and assembly.

Claims (5)

1. A self-lubricating dynamic-static pressure coupling air bearing with an inner channel, the two ends of the outer circle of the bearing are provided with vibration-damping elastic rings; it is characterized in that: it includes a static pressure system and a dynamic pressure system, wherein, The static pressure system is to set a double row of pressure air supply holes through the bearing body. The nozzles of the air supply holes intersect with the inner circle of the bearing in a tangential direction, and the nozzles are evenly distributed on the surface of the inner circle of the bearing; In the dynamic pressure system, a pressurized flow channel groove is arranged on the circular surface of the bearing body. The pressurized flow channel groove is a groove closed around, and the inner ends have a distance from each other, and the outer end has a distance from the edge of the bearing body. 2. The air bearing according to claim 1, wherein the bearing body is made of one of carbon graphite alloy, carbon fiber and polytetrafluoroethylene. 3. The air bearing according to claim 1, wherein the damping elastic ring is made of one of rubber ring, metal rubber, and elastic composite material. 4. The air bearing according to claim 1, characterized in that: the bearing body and the damping elastic ring are a hydrodynamic pressure bearing seal ring structure. 5. The air bearing according to claim 1, wherein the pressurized runner grooves are arranged in a figure-eight on the circular surface of the bearing body.

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