JPH05176944A - Turbine - Google Patents

Abstract

PURPOSE:To improve the turbine in such a manner that the turbine can rotated extremely silently at a high speed and that high torque can be obtd. by stable rotation. CONSTITUTION:At least a part of moving parts, such as an impeller or a rotor 2, etc., are made of a synthetic resin. These moving parts are made of a composite resin formed by mixing quartz, glass or carbon into the synthetic resin. The vane parts 21 of the impeller 2 are treated to a rugged surface by dulling. At least a part of a handle is made of the synthetic resin and further at least a part of thereof is formed flexible.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to improvements in turbines.

[0002]

2. Description of the Related Art Conventionally, impeller blades for dentist air turbines and the like are usually made of metal. For this reason, when the turbine rotates at high speed, high noise peculiar to metal is generated, which is extremely unpleasant. Further, even if a light metal such as an aluminum alloy is used as the metal, there is a drawback that the core may run out and the rotation may not be stable.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate such drawbacks of the prior art and to provide a very quiet silent high speed rotation and a stable rotation to obtain a high torque.

[0004]

At least a part of a movable portion such as an impeller or a rotor is made of synthetic resin. Further, the movable part is made of a composite resin in which quartz, glass or carbon is mixed with a synthetic resin. Also, the impeller blade portions are processed to have an uneven surface by a dull process.
Further, at least a part of the handle is made of synthetic resin, and at least a part of the handle is made flexible.

[0005]

According to the present invention, since at least a part of the movable portion is made of synthetic resin as described above, the rotating body can be made extremely lightweight and stable high speed rotation can be achieved. The high-pitched unpleasant sound peculiar to the conventional metal ones is not generated, quiet high-speed rotation can be performed, and the rotation torque can be extremely improved. Further, it can be strengthened by increasing the mechanical strength by making it a composite material in which quartz, glass or carbon is mixed with a synthetic resin, and can be configured to have abrasion resistance. Further, by forming a concave-convex surface by dulling the impeller blades, the frictional property of the working fluid with air, gas, steam, etc. is increased and the rotational drive efficiency is increased, whereby the torque can be significantly increased. In addition, since at least a part of the handle is made of synthetic resin, it has a sound-absorbing property with no sound propagation and is lightweight, which is extremely easy to use for dentists. In addition, since it is flexible, treatment in the oral cavity is easy and convenient.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment of the drawings. FIG. 1 is a side sectional view of the present invention, and FIG. 2 is an enlarged view of a blade portion. Reference numeral 1 is a cylinder, 2 is an impeller inserted in the cylinder, and a plurality of blades are formed on the peripheral surface, and both shafts 3 and 4 are supported by bearings 5 and 6 so that they can rotate smoothly. Reference numeral 7 is an air nozzle that opens to the impeller blade portion and is connected to the compressor.

The impeller 2 is made of synthetic resin. Synthetic resins include PVA, PET, ABS, acetal,
PPM, LCP, and other thermosetting resins are used,
Further, an ultra-high molecular material having a molecular weight of M = 10 ⁶ or more, a photopolymerization resin, etc. can be used. Further, a composite resin in which fibers such as quartz, glass, carbon, etc. and powder are mixed with resin is used.
When a synthetic resin is used for the shafts 3 and 4, lubricity and wear resistance can be improved by plating the shaft surface with metal and hardening the surface. Further, as shown in FIG. 3, by forming grooves on the surfaces of the shafts 3 and 4, the shafts can be guided around the shafts by a gas bearing action, and high speed rotation can be realized. Moreover, P is used for the bearings 5 and 6.
E bearings, nylon bearings, etc. can be used. Injection molding, compression molding, photopolymerization and the like can be arbitrarily used for molding the impeller and the like.

A grinding tool such as a grindstone or a bar is chucked at the tip of the rotary shaft 4 projecting from the cylinder 1 for use in grinding, and a cooling liquid is supplied from a nozzle 8 to rotate the rotary shaft 3,
Stable machining can be performed through jet cooling to the grinding gap through Nos. 2 and 4. The air pressure supplied from the air nozzle 7 is about 1 to 3 kgf / cm ² , and the rotation speed is 30.
It is from 00 to 5000 rps. Since all or the main body of the rotating body such as the impeller 2 is made of synthetic resin, a very uncomfortable noise is not generated even at high speed rotation, and extremely silent rotation drive can be performed. Further, since the rotating body is configured to be lightweight, it is possible to perform stable high-speed rotation with less center runout.

FIG. 4 is a comparative example of the rotational characteristics of the present invention and the conventional example, in which the rotor is made of PET, the bearing clearance is 20 μm, the cylinder gap is 8 impeller blades, and the gap is about 35 μm in a shaft diameter of 2.8 mm. In the turbine formed below, the rotation speed is about 3200 rps and 2 k at an air pressure of 1 kgf / cm ^2.
It was about 5000 rps at gf / cm ² and about 5500 rps at 3 kgf / cm ² . This means that the rotation speed can be doubled at a high speed with the same air pressure as compared with the conventional turbine. The rotation torque is about 8
It was ~ 12 N-m. The abrasion resistance was about 8 to 10 times that of polyacetal, 12 times that of polycarbonate, and 70% that of polyamide. Since polyethylene is an ultra-high molecular weight material with a molecular weight of 10 ^{6 to} 6 × 10 ⁶ , it has high strength and wear resistance, and its sound deadening is about 25% that of ordinary metals.
The frequency was about 0.5 to 3.2 KHZ.

The edge portion of the blade of the impeller 2 as shown in FIG. 2 is rounded as shown by the dotted line, so that the self-resistance in the rotational direction can be reduced. Moreover, the torque characteristics can be further increased by increasing the friction coefficient of the surface by subjecting the surface of the blade to the concavo-convex surface treatment by dull processing, and for example, 10 to 20 N-by the air pressure of 1 to ² kgf / cm ^2.
It could be increased to about m. Further, by forming a groove in the shaft as shown in FIG. 3, the shaft can always be guided to the center of rotation by the action of the fluid center, core runout can be eliminated, high speed rotation can be facilitated, and silent rotation is possible. To do.

FIG. 5 shows another embodiment in which the handle portion 9 for supporting the turbine 1 is made flexible for convenience of dentist use. Reference numeral 10 denotes a grip portion, and by making the gap between this portion and the tip turbine 1 flexible, the direction of the tool 11 attached to the tip of the turbine can be freely changed, and the therapeutic property in the oral cavity is improved. Become so. In FIG. 6, members 91 having a convex 9a at the front end and a concave 9b at the rear end are fitted to each other to be combined in a multi-bonded manner to be flexible, and a through hole 90 is formed in the central portion of the member 91. It is formed and communicates with the turbine nozzle 7 to form an air supply hole. As the material, resin, metal or the like can be arbitrarily used.

FIG. 7 shows a spiral tube 92 formed, which can also be bent arbitrarily.
Treatment in the oral cavity becomes easy. Reference numeral 93 is an air pipe inserted into the tube. As the other flexible tube, a flexible shape memory alloy such as a TiNi-based alloy can be used, and another flexible alloy tube can be used. Further, if at least a part of the handle 9 is made of synthetic resin, the propagation of sound is eliminated and the sound deadening effect is further improved, so that the sound can be made light in weight, so that it is extremely easy to use for a dentist or the like.

[0013]

As described above, according to the present invention, since at least a part of the movable portion is made of synthetic resin, the rotating body can be made extremely lightweight and stable high speed rotation can be achieved. The high-pitched unpleasant sound peculiar to the conventional metal ones is not generated, quiet high-speed rotation can be performed, and the rotation torque can be extremely improved. Further, it can be strengthened by increasing the mechanical strength by being made of a composite material in which a synthetic resin is mixed with quartz, glass or carbon, and can be configured to have abrasion resistance. Further, by forming the uneven surface by dulling the impeller blade portion, the frictional property of the working fluid with air, gas, steam, etc. is increased and the rotational drive efficiency is increased, whereby the torque can be remarkably increased.
Further, since at least a part of the handle for supporting the turbine is made of a synthetic resin, it is lightweight and easy to use, and the sound deadening effect is improved. Further, by making at least a part of the handle flexible, especially for dentists. This has the effect of facilitating treatment in the oral cavity and prompt treatment.

[Brief description of drawings]

FIG. 1 is a structural diagram of an embodiment of the present invention.

FIG. 2 is an enlarged view of a part of a blade in FIG.

FIG. 3 is an enlarged view of a part of the rotary shaft of FIG.

FIG. 4 is a graph showing a rotation characteristic of the present invention.

FIG. 5 is another embodiment of the present invention.

FIG. 6 is a partial detailed structural diagram of FIG. 5;

FIG. 7 is a detailed structural diagram of another implementation part of FIG. 5;

[Explanation of symbols]

 1 Cylinder 2 Impeller 21 Vane 3,4 Shaft 5,6 Bearing 7 Air Nozzle 8 Cooling Water Nozzle

Claims (5)

[Claims] 1. A turbine driven by a pressurized gas, characterized in that at least a part of a movable part such as an impeller or a rotor is made of synthetic resin. 2. The turbine according to claim 1, wherein the movable part is made of a composite resin in which quartz, glass or carbon is mixed with a synthetic resin. 3. The turbine according to claim 1, wherein the impeller blade portions are processed to have an uneven surface by dull processing. 4. The synthetic resin is used for at least a part of the handle forming the pressurized gas supply passage.
Turbine described in. 5. The handle according to claim 1, wherein at least a part of the handle forming the pressurized gas supply passage is made flexible.
Alternatively, the turbine according to claim 4.