Dental low speed handpiece pneumatic motor

Abstract

This invention relates to the field of dental handpiece technology and discloses a dental low-speed handpiece pneumatic motor, including a housing. A stator is coaxially and sealed within the housing, and an eccentric through-hole is provided within the stator. A rotor is axially rotatably mounted within the eccentric through-hole, and a rotating shaft is connected to the center of the rotor. Multiple slots are provided on the circumferential surface of the rotor, and blades are slidably inserted into the slots via a first spring. An air inlet pipe and an air outlet pipe are provided within the housing. An air inlet regulating mechanism is provided on the air inlet pipe, comprising an inner tube, an outer tube, a piston, a second spring, and an regulating block for adjusting the airflow cross-sectional area. Multiple air holes are spaced circumferentially on the inner tube. The piston is positioned between the inner and outer tubes and can slide axially. A second spring is located at the end of the piston away from the air holes. The inner surface of the piston has an inclined surface that slidably connects with the regulating block. This invention can automatically adjust the airflow cross-sectional area and regulate the air pressure when the airflow is too large.

Description

Technical Field

[0001] This invention relates to the field of dental handpiece technology, and more specifically to a dental low-speed handpiece pneumatic motor. Background Technology

[0002] A dental handpiece is a commonly used oral medical instrument used for operations such as grinding, polishing, and grinding teeth. A pneumatic motor is a dental surgical tool that uses compressed air as a power source, offering advantages such as high efficiency, high speed, portability, and low noise. In dental handpieces, compressed air drives rotating mechanisms such as air turbines and pneumatic motors. The airflow is controlled by foot pedals. Fluctuations in airflow can occur; excessive airflow can negatively impact patient comfort, and insufficient lubrication can cause motor wear. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a dental low-speed handpiece pneumatic motor that can automatically adjust the cross-sectional area of ​​the airflow when the airflow is too large, thereby quickly regulating the air pressure.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a dental low-speed handpiece pneumatic motor, comprising a housing, a stator coaxially and sealed inside the housing, an eccentric through hole inside the stator, a rotor axially rotatably disposed inside the eccentric through hole, a rotating shaft connected to the center of the rotor, a plurality of slots equidistantly arranged axially on the circumferential surface of the rotor, blades being slidably inserted into the slots via a first spring, the outer circumferential surface of the rotor being tangent to the inner circumferential surface of the stator, and an air inlet pipe for supplying compressed air into the eccentric through hole and an air outlet pipe for supplying gas, wherein the rotor is rotated by compressed air;

[0005] The intake pipe is equipped with an intake adjustment mechanism, which includes an inner tube, an outer tube connected to the outer tube, a piston, a second spring, and an adjustment block for adjusting the cross-sectional area of ​​the airflow. Multiple air holes penetrating the inner tube wall are spaced circumferentially on the inner tube. The piston is positioned between the inner and outer tubes and can slide axially. The second spring is positioned between the inner and outer tubes, at the end of the piston furthest from the air holes. The inner surface of the piston has a beveled surface. One end of the adjustment block is slidably connected to the beveled surface, and the other end slides vertically through the inner tube. When the airflow pressure is greater than the applied force of the second spring, the compressed air pushes the piston towards the second spring, causing the adjustment block to move vertically, thus changing the cross-sectional area of ​​the airflow.

[0006] Furthermore, the rear end of the housing is provided with an air inlet interface that connects to the air inlet pipe, and an air outlet interface that connects to the air outlet pipe.

[0007] Furthermore, the two ends of the rotating shaft are rotatably mounted inside the phone casing via bearings.

[0008] Furthermore, the outer wall of the outer tube is provided with an annular limiting groove for limiting the position of the piston.

[0009] Furthermore, a groove is provided circumferentially on the outer peripheral surface of the rotor.

[0010] Furthermore, the grooves are spaced in multiples along the rotor axial direction.

[0011] By adopting the above technical solution, the present invention has the following beneficial effects:

[0012] This invention incorporates an air intake adjustment mechanism. When the airflow pressure is too high, the airflow generates thrust through the air hole, which acts on the piston. The compressed air pushes the piston to move, thereby pushing the adjustment block to move vertically, changing the cross-sectional area of ​​the airflow. This automatically and quickly adjusts the air pressure, keeping the airflow within a certain pressure range, improving the patient's experience, and reducing problems such as motor damage. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 This is the present invention. Figure 1 A magnified view of part A in the image;

[0015] Figure 3 This is a cross-sectional schematic diagram of the pneumatic motor of the present invention;

[0016] Figure 4 This is a schematic diagram of the rotor structure of the present invention;

[0017] In the diagram: 1-House, 11-Stator, 111-Eccentric through hole, 12-Rotor, 121-Slot, 122-Groove, 13-Blade, 14-First spring, 15-Rotating shaft, 16-Bearing, 17-Intake pipe, 18-Outtake pipe, 19-Intake interface, 20-Outtake interface, 2-Intake adjustment mechanism, 21-Inner tube, 211-Air hole, 212-Annular limiting groove, 22-Outer tube, 23-Piston, 231-Slanted surface, 24-Second spring, 25-Adjusting block. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0019] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0020] like Figures 1-4 As shown, a dental low-speed handpiece pneumatic motor includes a housing 1. A stator 11 is coaxially and sealed within the housing 1. An eccentric through-hole 111 is provided within the stator 11. A rotor 12 is axially rotatably mounted within the eccentric through-hole 111. A rotating shaft 15 is connected to the center of the rotor 12. The two ends of the rotating shaft 15 are rotatably mounted within the handpiece housing 1 via bearings 16. Multiple slots 121 are equidistantly arranged axially on the circumferential surface of the rotor 12. Blades 13 are slidably inserted into the slots 121 via a first spring 14. The outer circumferential surface of the rotor 12 is tangent to the inner circumferential surface of the stator 11. The housing 1 has an air inlet pipe 17 for supplying compressed air into the eccentric through-hole 111 and an air outlet pipe 18 for discharging gas. The rotor 12 rotates due to the compressed air. The rear end of the housing 1 has an air inlet port 19 connecting to the air inlet pipe 17 and an air outlet port 20 connecting to the air outlet pipe 18, facilitating connection to an external air source.

[0021] An intake regulating mechanism 2 is provided on the intake pipe 17. The intake regulating mechanism 2 includes an inner pipe body 21, an outer pipe body 22 connected to the outside of the inner pipe body 21, a piston 23, a second spring 24, and an adjusting block 25 for adjusting the cross-sectional area of ​​the airflow. Multiple air holes 211 are arranged circumferentially on the inner pipe body 21, penetrating the pipe wall of the inner pipe body 21. The piston 23 is located between the inner pipe body 21 and the outer pipe body 22 and can slide axially. The second spring 24 is arranged between the inner pipe body 21 and the outer pipe body 22 and at the end of the piston 23 away from the air holes 211. The inner surface of the piston 23 is provided with a beveled surface 231. One end of the adjusting block 25 is slidably connected to the beveled surface 231, and the other end of the adjusting block 25 slides vertically through the inner pipe body 21. When the airflow pressure is greater than the applied force of the second spring 24, the compressed air pushes the piston 23 to move towards the second spring 24, and the adjusting block 25 moves in the vertical direction, thereby changing the cross-sectional area of ​​the airflow with the movement of the adjusting block 25.

[0022] The outer wall of the outer tube 22 is provided with an annular limiting groove 212 for limiting the position of the piston 23. This facilitates the piston 23 returning to its original position under the action of the second spring 24.

[0023] A groove 122 is provided circumferentially on the outer peripheral surface of the rotor 12. Multiple grooves 122 are spaced apart along the axial direction of the rotor 12. The grooves 122 facilitate gas flow.

[0024] In use, airflow enters the stator 11 through the intake pipe 17, pushing the blades 13 to rotate the rotor 12. Since the blades 13 are slidably connected to the slots 121 on the rotor 12, under the action of centrifugal force, the blades 13 tend to deviate from the central axis of the rotor 12. During rotation, when the rotor 12 is tangent to the stator 11, the blades 13 retract into the slots 121 under the action of the stator 11. In the non-tangent part, the blades 13 extend out of the slots 121 under the action of the second spring 24 and centrifugal force, and abut against the inner surface of the stator 11. Since the surface of the stator 11 is provided with grooves 122, it is conducive to the flow of gas.

[0025] During operation, airflow enters the space between the inner tube 21 and the outer tube 22 through the air hole 211, applying force to the piston 23. When the airflow pressure is less than the applied force of the second spring 24, the piston 23 does not move, and the adjusting block 25 retracts onto the side wall of the inner tube 21, without affecting the airflow cross-sectional area of ​​the inner tube 21. When the airflow pressure is greater than the applied force of the second spring 24, the airflow generates thrust through the air hole 211, acting on the piston 23. The compressed air pushes the piston 23 towards the side of the second spring 24, causing the adjusting block 25 to slide along the inclined surface 231 of the piston 23, pushing the adjusting block 25 vertically into the inner tube 22, changing the airflow cross-sectional area, thereby automatically and quickly adjusting the air pressure and keeping the airflow within a certain pressure range.

[0026] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A dental low-speed handpiece pneumatic motor, characterized by, The utility model provides a kind of air compressor, including shell, the shell is coaxially closed with stator, the stator is equipped with eccentric through-hole, the eccentric through-hole is equipped with rotor and rotates axially, the center of the rotor is connected with rotating shaft, the circumference of the rotor is equidistantly equipped with multiple insertion slots, the blade is inserted in the insertion slot by first spring sliding, the outer circumference of the rotor is tangent with the inner circumference of the stator, the shell is equipped with the air inlet pipeline that sends compressed air into the eccentric through-hole and the air outlet pipeline that sends out gas, and the rotor is rotated by compressed air;The both ends of the rotating shaft are rotatably arranged in the shell by bearing; The air inlet pipeline is equipped with air inlet adjusting mechanism, and the air inlet adjusting mechanism includes inner tube body, outer tube body connected to the outer tube body, piston, second spring and adjusting block for adjusting gas flow cross-sectional area, a plurality of air holes penetrating the tube wall of the inner tube body are arranged on the inner tube body at intervals in the circumferential direction, the piston is arranged between the inner tube body and the outer tube body and can slide axially, the second spring is arranged between the inner tube body and the outer tube body and away from the air hole end of the piston, the inner surface of the piston is provided with an inclined surface, one end of the adjusting block is slidably connected with the inclined surface, and the other end of the adjusting block vertically slides through the inner tube body;When the air flow pressure is greater than the applied force of the second spring, the compressed air pushes the piston to move to the side of the second spring, so that the adjusting block moves in the vertical direction, so that the gas flow cross-sectional area changes with the movement of the adjusting block.

2. A pneumatic motor for a dental low-speed handpiece according to claim 1, wherein The rear end of the shell is provided with an air inlet interface communicating with the air inlet pipeline, and an air outlet interface communicating with the air outlet pipeline.

3. A pneumatic motor for a dental low speed handpiece according to claim 1, wherein An annular limiting groove is arranged on the outer wall of the outer tube body for limiting the position of the piston.

4. A pneumatic motor for a dental low-speed handpiece according to claim 1, wherein A groove is arranged on the outer circumference of the rotor in the circumferential direction.

5. A pneumatic motor for a dental low-speed handpiece according to claim 4, wherein The grooves are arranged at intervals in the axial direction of the rotor.

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