Dental low-speed handpiece pneumatic motor

Abstract

The invention relates to the technical field of dental handpieces, and discloses a dental low-speed handpiece pneumatic motor which comprises a shell, a stator is coaxially and hermetically arranged in the shell, an eccentric through hole is formed in the stator, a rotor is axially and rotatably arranged in the eccentric through hole, a rotating shaft is connected to the center of the rotor, and a plurality of slots are formed in the circumferential surface of the rotor. Blades are slidably inserted into the inserting grooves through first springs, and an air inlet pipeline and an air outlet pipeline are arranged in the shell. The air inlet pipeline is provided with an air inlet adjusting mechanism, the air inlet adjusting mechanism comprises an inner pipe body, an outer pipe body, a piston, a second spring and an adjusting block used for adjusting the airflow cross section area, a plurality of air holes are formed in the inner pipe body at intervals in the circumferential direction, and the piston is arranged between the inner pipe body and the outer pipe body and can slide in the axial direction; a second spring is arranged at the end, away from the air hole, of the piston. An inclined face in sliding connection with the adjusting block is arranged on the inner surface of the piston. When the airflow is too large, the sectional area of the airflow can be automatically adjusted, and the air pressure is adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of dental handpieces, and in particular to a dental low-speed handpiece pneumatic motor. Background Art

[0002] Dental low-speed handpieces are a commonly used oral medical device used for grinding, polishing, and other operations on patients' teeth. Pneumatic motors are dental surgical tools that use compressed air as a power source and have the advantages of high efficiency, high speed, lightness, and low noise. In dental handpieces, compressed air is used to drive rotating mechanisms such as air turbines and pneumatic motors. The airflow is controlled by foot, and the airflow will fluctuate. When the airflow is too large, it is easy for patients to have a poor experience. When lubrication is insufficient, it is also easy to cause motor wear. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and provide a dental low-speed handpiece pneumatic motor, which can automatically adjust the cross-sectional area of ​​the airflow when the airflow is too large, thereby quickly adjusting the air pressure.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a dental low-speed handpiece pneumatic motor, comprising a housing, a stator is coaxially and sealedly arranged in the housing, an eccentric through hole is arranged in the stator, a rotor is axially and rotatably arranged in the eccentric through hole, a rotating shaft is connected to the center of the rotor, a plurality of slots are equidistantly arranged axially on the circumferential surface of the rotor, blades are slidably inserted in the slots through a first spring, the outer circumferential surface of the rotor is tangent to the inner circumferential surface of the stator, an air inlet pipe for sending compressed air into the eccentric through hole and an air outlet pipe for sending gas are arranged in the housing, and the rotor is rotated by compressed air;

[0005] The air intake pipe is provided with an air intake regulating mechanism, which includes an inner tube body, an outer tube body connected to the inner tube body, a piston, a second spring and an regulating block for adjusting the cross-sectional area of ​​the air flow. A plurality of air holes penetrating the tube wall of the inner tube body are arranged on the inner tube body at intervals along the circumferential direction. The piston is arranged between the inner tube body and the outer tube body and can slide along the axial direction. The second spring is arranged between the inner tube body and the outer tube body and at the end of the piston away from the air hole. The inner surface of the piston is provided with an inclined surface. One end of the regulating block is slidably connected to the inclined surface, and the other end of the regulating 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 toward the side of the second spring, and the regulating block moves in the vertical direction, so that the cross-sectional area of ​​the air flow changes with the movement of the regulating block.

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

[0007] Furthermore, both ends of the rotating shaft are rotatably arranged in the mobile phone housing through bearings.

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

[0009] Furthermore, a groove is arranged on the outer peripheral surface of the rotor along the circumferential direction.

[0010] Furthermore, the grooves are arranged in plurality at intervals along the axial direction of the rotor.

[0011] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0012] The present invention provides an air intake regulating mechanism. When the air flow pressure is too large, the air flow generates thrust acting on the piston through the air hole. The compressed air pushes the piston to move, thereby pushing the regulating block to move in the vertical direction, changing the cross-sectional area of ​​the air flow, thereby automatically and quickly regulating the air pressure, keeping the air flow within a certain pressure range, making the patient feel better, and reducing the occurrence of problems such as motor damage. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] Figure 2 The present invention Figure 1 A partial enlarged view of middle A;

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

[0016] Figure 4 It is a schematic structural diagram of the rotor of the present invention;

[0017] In the figure: 1-housing, 11-stator, 111-eccentric through hole, 12-rotor, 121-slot, 122-groove, 13-blade, 14-first spring, 15-rotating shaft, 16-bearing, 17-inlet pipe, 18-outlet pipe, 19-inlet interface, 20-outlet interface, 2-inlet adjustment mechanism, 21-inner tube body, 211-air hole, 212-annular limiting groove, 22-outer tube body, 23-piston, 231-oblique surface, 24-second spring, 25-adjusting block. DETAILED DESCRIPTION

[0018] In order to make the technical personnel of the technical field better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by the technical personnel of the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. 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 optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

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

[0020] like Figure 1-Figure 4 As shown, a dental low-speed handpiece air motor comprises a housing 1, a stator 11 is coaxially and sealedly arranged in the housing 1, an eccentric through hole 111 is arranged in the stator 11, a rotor 12 is axially and rotatably arranged in the eccentric through hole 111, a rotating shaft 15 is connected to the center of the rotor 12, and both ends of the rotating shaft 15 are rotatably arranged in the housing 1 of the handpiece through bearings 16. A plurality of slots 121 are equidistantly and axially arranged on the circumferential surface of the rotor 12, blades 13 are slidably inserted in the slots 121 through first springs 14, the outer circumferential surface of the rotor 12 is tangent to the inner circumferential surface of the stator 11, an air inlet pipe 17 for feeding compressed air into the eccentric through hole 111 and an air outlet pipe 18 for feeding gas are arranged in the housing 1, the rotor 12 is rotated by compressed air, an air inlet interface 19 connected to the air inlet pipe 17 and an air outlet interface 20 connected to the air outlet pipe 18 are arranged at the rear end of the housing 1, so as to facilitate communication with an external air source.

[0021] An air intake regulating mechanism 2 is provided on the air intake duct 17. The air intake regulating mechanism 2 includes an inner tube body 21, an outer tube body 22 connected to the outside of the inner tube body 21, a piston 23, a second spring 24 and an adjusting block 25 for adjusting the cross-sectional area of ​​the air flow. A plurality of air holes 211 penetrating the tube wall of the inner tube body 21 are arranged at intervals along the circumferential direction on the inner tube body 21. The piston 23 is arranged between the inner tube body 21 and the outer tube body 22 and can slide along the axial direction. The second spring 24 is arranged between the inner tube body 21 and the outer tube body 22 and at the end of the piston 23 away from the air hole 211. The inner surface of the piston 23 is provided with an inclined surface 231. One end of the adjusting block 25 is slidably connected to the inclined surface 231, and the other end of the adjusting block 25 vertically slides through the inner tube body 21. When the air flow pressure is greater than the applied force of the second spring 24, the compressed air pushes the piston 23 to move toward the side of the second spring 24, and the adjusting block 25 moves in the vertical direction, so that the cross-sectional area of ​​the air flow changes with the movement of the adjusting block 25.

[0022] An annular limiting groove 212 for limiting the position of the piston 23 is provided on the outer wall of the outer tube body 22, which is conducive to the piston 23 returning to the original position under the action of the second spring 24.

[0023] A groove 122 is provided along the circumferential direction on the outer peripheral surface of the rotor 12. A plurality of grooves 122 are provided at intervals along the axial direction of the rotor 12. The provision of the grooves 122 is conducive to gas flow.

[0024] When in use, the airflow enters the stator 11 from the air inlet duct 17, pushing the blades 13 to rotate the rotor 12. Since the blades 13 are slidingly connected to the slots 121 on the rotor 12, under the action of the rotating centrifugal force, the blades 13 tend to deviate from the central axis of the rotor 12. During the rotation process, when the rotor 12 is tangent to the stator 11, the blades 13 are contracted 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 due to the second spring 24 and the rotating centrifugal action, and abut against the inner surface of the stator 11. Since the surface of the stator 11 is provided with grooves 122, the flow of gas is facilitated.

[0025] During use, the airflow enters the space between the inner tube body 21 and the outer tube body 22 from the air hole 211, exerting force on the piston 23. When the airflow pressure is less than the force exerted by the second spring 24, the piston 23 does not move, and the adjustment block 25 shrinks on the tube wall of the inner tube body 21 on the side wall, without affecting the airflow cross-sectional area of ​​the inner tube body 21. When the airflow pressure is greater than the force exerted by the second spring 24, the airflow generates thrust acting on the piston 23 through the air hole 211, and the compressed air pushes the piston 23 to move toward the side of the second spring 24, then the adjustment block 25 slides along the inclined surface 231 of the piston 23, pushing the adjustment block 25 to move vertically toward the inside of the inner tube body 22, changing the airflow cross-sectional area, thereby automatically and quickly adjusting the air pressure, so that the airflow is kept within a certain pressure range.

[0026] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, 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 in that: It comprises a shell, a stator is coaxially and sealed in the shell, an eccentric through hole is provided in the stator, a rotor is axially and rotatably provided in the eccentric through hole, a rotating shaft is connected to the center of the rotor, a plurality of slots are equidistantly and axially provided on the circumferential surface of the rotor, blades are slidably inserted in the slots through a first spring, the outer circumferential surface of the rotor is tangent to the inner circumferential surface of the stator, an air inlet pipe for sending compressed air into the eccentric through hole and an air outlet pipe for sending gas are provided in the shell, and the rotor is rotated by compressed air; The air intake pipe is provided with an air intake regulating mechanism, which includes an inner tube body, an outer tube body connected to the inner tube body, a piston, a second spring and an regulating block for adjusting the cross-sectional area of ​​the air flow. A plurality of air holes penetrating the tube wall of the inner tube body are arranged on the inner tube body at intervals along the circumferential direction. The piston is arranged between the inner tube body and the outer tube body and can slide along the axial direction. The second spring is arranged between the inner tube body and the outer tube body and at the end of the piston away from the air hole. The inner surface of the piston is provided with an inclined surface. One end of the regulating block is slidably connected to the inclined surface, and the other end of the regulating 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 toward the side of the second spring, and the regulating block moves in the vertical direction, so that the cross-sectional area of ​​the air flow changes with the movement of the regulating block.

2. A dental low-speed handpiece pneumatic motor according to claim 1, characterized in that: The rear end of the shell is provided with an air inlet interface connected to the air inlet pipeline, and is provided with an air outlet interface connected to the air outlet pipeline.

3. A dental low-speed handpiece pneumatic motor according to claim 1, characterized in that: The two ends of the rotating shaft are rotatably arranged in the mobile phone housing through bearings.

4. A dental low-speed handpiece pneumatic motor according to claim 1, characterized in that: An annular limiting groove for limiting the position of the piston is provided on the outer wall of the outer tube body.

5. A dental low-speed handpiece pneumatic motor according to claim 1, characterized in that: A groove is arranged on the outer peripheral surface of the rotor along the circumferential direction.

6. A dental low-speed handpiece pneumatic motor according to claim 5, characterized in that: A plurality of grooves are arranged at intervals along the axial direction of the rotor.

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