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1. WO2020109368 - REVERSE-FLOW BRAKE FOR ROTORS IN DENTAL PREPARATION INSTRUMENTS

Publication Number WO/2020/109368
Publication Date 04.06.2020
International Application No. PCT/EP2019/082700
International Filing Date 27.11.2019
IPC
A61C 1/05 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
1Dental machines for boring or cutting
02characterised by the drive of the dental tools
05with turbine drive
F01D 15/06 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
DNON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
15Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
06Adaptations for driving, or combinations with, hand-held tools or the like
F01D 1/22 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
DNON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
1Non-positive-displacement machines or engines, e.g. steam turbines
18without working-fluid guiding means
22traversed by the working-fluid substantially radially
F01D 17/10 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
DNON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
17Regulating or controlling by varying flow
10Final actuators
F01D 17/12 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
DNON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
17Regulating or controlling by varying flow
10Final actuators
12arranged in stator parts
CPC
A61C 1/05
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
1Dental machines for boring or cutting ; ; General features of dental machines or apparatus, e.g. hand-piece design
02characterised by the drive of the dental tools
05with turbine drive
F01D 15/062
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
15Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
06Adaptations for driving, or combinations with, hand-held tools or the like ; control thereof
062Controlling means specially adapted therefor
F01D 15/065
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
15Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
06Adaptations for driving, or combinations with, hand-held tools or the like ; control thereof
065with pressure-velocity transformation exclusively in rotor
Applicants
  • DENTSPLY SIRONA INC. [US]/[US]
  • SIRONA DENTAL SYSTEMS GMBH [DE]/[DE]
Inventors
  • GOISSER, Siegfried
  • GÖBEL, Stefan
  • ERTUGRUL, Metin
Agents
  • ÖZER, Alpdeniz
  • ÖZER, Dr. Alpdeniz
Priority Data
18208524.127.11.2018EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) REVERSE-FLOW BRAKE FOR ROTORS IN DENTAL PREPARATION INSTRUMENTS
(FR) FREIN À FLUX INVERSE POUR ROTORS DANS DES INSTRUMENTS DE PRÉPARATION DENTAIRE
Abstract
(EN)
The invention relates to a rotor (1) having a turbine wheel (3) driven by propellant (TG) in a turbine housing (2), a dental preparation instrument (20) having such a rotor (1) and a method (100) for operating such a preparation instrument (20), wherein at least one part of the propellant (TG) flows back to the gas outlet opening (51) in an inner wall (21) radially orbiting the turbine wheel (3) through a return flow channel (6) after impinging on at least one of the drive blades (31) of the turbine wheel (3) counter to the direction of rotation (DR) of the turbine wheel (3), the inner wall (21) in the segment of a circle (KS) comprises at least one return flow channel (6) extending at least from the gas inlet opening (41) as far as the gas outlet opening (51), which allows at least one part of the propellant (TG) to flow back to the gas outlet opening (51) through the return flow channel (6) after impinging on at least one of the drive blades (31) counter to the direction of rotation (DR) of the turbine wheel (3), wherein, in axial direction (AR), the turbine housing (2) has at least one cross-sectional extension (8) of a surface between drive blades (31) and inner wall (21) as far as the return flow channel (6).
(FR)
L'invention concerne un rotor (1) comportant une roue de turbine (3) entraînée par un gaz propulseur (TG) dans un carter de turbine (2), un instrument de préparation dentaire (20) muni d'un tel rotor (1) et un procédé (100) pour faire fonctionner un tel instrument de préparation (20). Selon l'invention, au moins une partie du gaz propulseur (TG) reflux vers l'ouverture de sortie de gaz (51) dans une paroi interne (21) en orbite radiale de la roue de turbine (3) à travers un canal d'écoulement de retour (6) après avoir frappé au moins l'une des pales d'entraînement (31) de la roue de turbine (3) opposée à la direction de rotation (DR) de la roue de turbine (3). La paroi interne (21) dans le segment d'un cercle (KS)) comprend au moins un canal d'écoulement de retour (6) s'étend au moins de l'ouverture d'entrée de gaz (41) jusqu'à l'ouverture de sortie de gaz (51), ce qui permet à au moins une partie du gaz propulseur (TG) de refluer vers l'ouverture de sortie de gaz (51) à travers le canal d'écoulement de retour (6) après avoir frappé au moins l'une des pales d'entraînement (31) opposée à la direction de rotation (DR) de la roue de turbine (3). Dans la direction axiale (AR), le carter de turbine (2) présente au moins une extension transversale (8) d'une surface entre des pales d'entraînement (31) et une paroi intérieure (21) jusqu'au canal d'écoulement de retour (6).
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