Dust prevention structure for dental handpiece

Abstract

The invention provides a dust prevention structure for a dental handpiece. The dust prevention structure comprises a handpiece shell. A handpiece core is arranged in the handpiece shell and mainly comprises a handpiece core turbine and a handpiece-core large shaft driven by the handpiece core turbine to rotate. The handpiece-core large shaft is supported into the handpiece shell through a bearing piece, and the bearing piece comprises a front end bearing and a back end bearing; a first groove is formed in the handpiece shell and formed below the front end bearing, a dust prevention cover is arranged in the first groove and is a hollow columnar piece, and the hollow inner wall of the dust prevention cover is in close fit with the outer wall of the handpiece-core large shaft; a second groove which is provided with a downward opening and is used for changing a sucking path is formed in the outer portion of the dust prevention cover. The dust prevention structure is simple in structure and easy to achieve, and the pollution problem and the wear problem of the front end bearing are solved through the dust prevention cover and the first groove; compared with the prior art, the dust prevention structure has more stable and durable characteristics, and the service life of the handpiece is objectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of dental medical instruments, and in particular relates to a dustproof structure for a dental handpiece. Background technique [0002] The dental handpiece is a commonly used medical device in the department of stomatology. Its working principle is to use the air compressor to compress the air into high-pressure gas to blow the turbine to drive the bur to run at a high speed. The speed is usually about 360,000 revolutions per minute. Cutting teeth to remove bad tissue, or preparing porcelain teeth, can also be used for oral treatment such as grinding dentures. Its structure usually includes a handle and a machine head. The machine head includes a machine head shell 1 and a gland 7 that is adapted to connect with the machine head shell 1 through a bearing seat 8. A movement is arranged inside the machine head shell 1. The movement mainly includes a machine The core turbine 6 and the core shaft 4 driven by t...

AI Technical Summary

Problems solved by technology

Its structure usually includes a handle and a machine head. The machine head includes a machine head shell 1 and a gland 7 that is adapted to connect with the machine head shell 1 through a bearing seat 8. A movement is arranged inside the machine head shell 1. The movement mainly includes a machine The core turbine 6 and the core shaft 4 driven by the core turbine 6 to rotate, wherein the two ends of the core shaft 4 are equipped with bearings 5, and the bearings 5 ​​include a front end bearing 501 and a rear end bearing 502, wherein the machine The front-end bearing 501 of the core shaft 4 is the most easily worn part in the mobile phone. Once the front-end bearing 501 is damaged, the mobile phone cannot be used. At this time, the tooth powder will enter the front bearing 501 of the mobile phone head, increasing the wear and tear of the front bearing 501) At the moment of the machine, the movement turbine 6 continues to rotate under the action of inertia, so that the center of the air chamber of the movement turbine 6 forms a momentary negative pressure, The instant negative pressure is very easy to directly suck the powdery tooth chips produced by the mobile phone grinding teeth into the installation position where the front end bearing 501 is located (such as Figure 5 As shown), it can be seen that the straight-through relationship between the axial clearance 401 and the installation position of the front end bearing 501 is the main reason for tooth dust to reside in the front end bearing 501 and thus cause the front end bearing 501 to wear. There is a scheme of adding a multi-layer dust-proof device between the front end bearing 501 and the nose shell 1 for the stop suction function, but the disadvantage of this technical solution is that if this design is to be realized, the front end bearing 501 and the nose shell 1 The space between them is limited, so the structure of the existing mobile phone head shell 1 has been changed too much, and the number of spare parts constituting the dustproof device is too many, the manufacturing is complicated, and the manufacturing cost of the mobile phone is virtually increased; in addition, there are some dental The mobile phone realizes the sealed dust-proof design through the blocking of the elastic seal. The disadvantage of this design is that the elastic seal is easily aged after repeated high-temperature disinfection operations, and its sealing and dust-proof performance will eventually be affected, and the long-term stability is not good. Now In view of the above technical problems, the following improvements are proposed

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