| 摘要 |
<p>A dental turbine drill, comprises a handle and a head which is connected to the handle, the head is composed of a head housing (1) and a core (2) which is positioned within a head housing cavity, the head housing (1) is composed of a head housing wall (181) and a head housing cover (182), the core (2) is composed of a connecting shaft turbine and an upper bearing (221) and a lower bearing (222), the upper bearing(221) and the lower bearing (222) are respectively sleeves on an upper portion and a lower portion of a turbine shaft (281) of the connecting shaft turbine and placed on the corresponding bearing seats (11,12) which are in the head housing (1), a turbine cavity (13) is formed between the upper bearing (221) and the lower bearing (222), the turbine cavity(13) has an air inlet channel and an air returning channel, an upper air outlet channel is positioned above the upper bearing (221) and a lower air outlet channel is positioned below the lower bearing (222), a handle neck (81) is located the place where the handle is connected to the head housing (1), the materials of the head housing(1) and the handle are both plastic. LED label lamps (31) are positioned on the outside of the head housing wall (181) and around a machine needle jack, the LED label lamps (31) are connected to a power source and a switch, the switch refers to an air-operated film switch which is placed on the lower air outlet channel. The air-operated film switch is very thin, and the thickness of the LED label lamps (31) is also not large. Thus, the switch and the lamps are positioned on the head with the volume of the head increased very little.</p> |
