Airflow suspension movement assembly for high-speed turbine dental handpiece and dental handpiece

Abstract

The invention relates to the technical field of medical instruments, in particular to an airflow suspension movement assembly and a dental handpiece, the airflow suspension movement assembly comprises a handpiece shell, a turbine assembly and a bearing, the bearing comprises an upper shaft sleeve and a lower shaft sleeve which are arranged outside a rotating shaft in a sleeving mode, a first gap is formed between the upper shaft sleeve and the rotating shaft, the upper shaft sleeve and the lower shaft sleeve are parallel to the upper end face and the lower end face of a turbine respectively to form a second gap, the upper shaft sleeve and the lower shaft sleeve are each provided with an annular air groove and a plurality of first throttling holes and second throttling holes, one ends of the first throttling holes and the second throttling holes are communicated with the annular air grooves, and the other ends of the first throttling holes and the second throttling holes are communicated with the first gap and the second gap respectively. When the turbine assembly works, a sleeve-shaped air film is formed in the radial direction of the rotating shaft through compressed air, flat gasket-shaped air films are formed on the upper end face and the lower end face of an impeller, and therefore the turbine assembly can be in a suspension state in the radial direction and the axial direction, and the turbine assembly is small in friction force, low in noise, and low in heat productivity when rotating at a high speed, not prone to abrasion, long in service life and easier to machine, manufacture and assemble.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an air suspension core component and a dental handpiece used for a high-speed turbine dental handpiece. Background technique [0002] High-speed turbine dental handpiece is a commonly used medical device in the department of stomatology. Its working principle is to use compressed air to blow the turbine to rotate at high speed, and then drive the rotating shaft and the needle to rotate at high speed. The speed is usually above 200,000 rpm to cut teeth It can be used to remove carious tissues from the body, or prepare porcelain teeth, and can also be used to polish dentures, etc. There are many varieties of high-speed turbo dental handpieces. In addition to the differences in quality, there are also various appearances and various additional functions. For example, there are thimble type, screw type and Button type; cooling methods include single-hole spray, double-hole s...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, one of the tasks of the present invention is to provide a kind of airflow suspension core assembly for the high-speed turbine dental handpiece, which forms a sleeve-shaped air film in the radial direction of the rotating shaft by compressed air during work, and The upper and lower ends of the impeller form a flat cushion-like air film to support the radial and axial support of the turbine assembly, so that the turbine assembly can be suspended in both the radial and axial directions without direct contact with the sleeve. When rotating at high speed, the friction force is very small, the power loss is small, the speed is high, the noise is low, the calorific value is low, it is not easy to wear, the service life is long, and it does not need lubricating substances, and there will be no problems caused by the overflow of lubricating substances, and it is easier Manufacture and assembly; the second task of the present invention is to provide a dental handpiece that adopts the above-mentioned air suspension core assembly

Images