Dental handpiece with efficient heat dissipation structure

Abstract

A disclosed dental handpiece with an efficient heat dissipation structure comprises a handle and a handpiece arranged at one end of the handle, the handle is internally provided with an air inlet channel and an air outlet channel, the handpiece is hollow, the air inlet channel and the air outlet channel are communicated with the interior of the handpiece, the handpiece is internally provided with a wind wheel, two rotating shafts and a bearing, and the wind wheel is connected with the two rotating shafts. The bearings are fixed through bearing seats and arranged on the upper side and the lower side of the wind wheel respectively, the rotating shafts are hollow shafts and coaxially connected to the upper end and the lower end of the wind wheel respectively, the rotating shafts are rotationally connected with the bearings through shaft sleeves, the rotating shaft at the upper end extends to the position above the upper side bearing and is open, and the rotating shaft at the lower end extends out of the machine head and is connected with a machine needle. The rotating shaft at the lower end is closed above the joint of the rotating shaft and the machine needle, and an opening is formed in the side wall below the lower side bearing. Heat generated by the bearing can be brought out, the temperature of the bearing is greatly reduced, the service life of the bearing is prolonged, and the heat dissipation effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oral medical instruments, and in particular to a dental handpiece with a high-efficiency heat dissipation structure. Background Art

[0002] Dental handpieces are commonly used medical devices in dentistry. They are divided into high-speed and low-speed types according to speed, and pneumatic and electric types according to driving mode. Pneumatic dental handpieces usually include a handle and a handpiece at one end of the handle. The handpiece is provided with a wind wheel, a rotating shaft and a bearing. The handle is provided with an air inlet channel and an exhaust channel. The working principle of a pneumatic dental handpiece is to use compressed air to blow the wind wheel to rotate, thereby driving the rotating shaft and the needle to rotate, so as to cut the tooth body to remove carious tissue, or prepare porcelain teeth, and can also be used for grinding dentures, etc. The wind wheel rotates at high speed under the blowing of compressed air, and the bearings are prone to generate more heat. If it is not discharged in time, it will shorten the service life of the bearings and even cause damage to the bearings. The existing heat dissipation structure is relatively complex, resulting in an increase in the size of the handpiece and poor heat dissipation effect. Summary of the invention

[0003] The object of the present invention is to provide a dental handpiece with an efficient heat dissipation structure to solve the problems pointed out in the background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dental handpiece with an efficient heat dissipation structure, comprising a handle and a handpiece arranged at one end of the handle, wherein an air intake channel and an exhaust channel are arranged in the handle, the interior of the handpiece is hollow, and the air intake channel, the exhaust channel and the interior of the handpiece are connected, and a wind wheel, two rotating shafts and bearings are arranged inside the handpiece, the bearings are fixed by a bearing seat and are respectively arranged on the upper and lower sides of the wind wheel, the rotating shaft is a hollow shaft, and the rotating shaft is coaxially connected to the upper and lower ends of the wind wheel, respectively, and the rotating shaft is rotatably connected through a shaft sleeve and a bearing, the rotating shaft at the upper end extends to above the upper bearing and is open, the rotating shaft at the lower end extends to the outside of the handpiece and is connected to a needle, and the rotating shaft at the lower end is connected to the upper side of the handpiece. The upper part of the needle connection is closed, and an opening is provided on the side wall below the lower bearing; air baffles are provided above the bearing on the upper side of the wind wheel and below the bearing on the lower side of the wind wheel, and annular through grooves connecting the upper and lower parts of the bearings are provided on the bearing seat and the shaft sleeve. Two exhaust channels are provided, one exhaust channel is connected to the area below the upper bearing of the wind wheel, and the other exhaust channel is connected to the area above the lower bearing of the wind wheel; the wind wheel includes end plates at the upper and lower ends and multiple grooves between the two end plates, and the end plates are provided with through holes corresponding to the rotating shaft, and the multiple grooves are arranged in a ring along the circumferential direction to form a cavity inside, and through grooves connected to the cavity are provided on the groove walls corresponding to the grooves and the air inlet channels.

[0005] As a preferred embodiment of the present technical solution, an end cover is provided at the upper end of the machine head, the end cover is threadedly connected to the inner wall of the machine head, and a sealing ring is provided between the end cover and the machine head.

[0006] As a preferred embodiment of the present technical solution, the air baffle plate above the bearing on the upper side of the wind wheel is arranged on the lower surface of the end cover, and the air baffle plate below the bearing on the lower side of the wind wheel is fixed to the inner lower wall of the machine head.

[0007] As a preferred embodiment of the present technical solution, the needle and the rotating shaft are detachably connected.

[0008] As a preferred embodiment of the present technical solution, a sealing ring is provided between the rotating shaft at the lower end of the wind wheel and the head.

[0009] Compared with the prior art, the wind wheel of the present invention is provided with a plurality of grooves, the grooves form a cavity, a through groove connected to the cavity is provided on the groove wall, annular through grooves are provided on the bearing seat and the shaft sleeve, and two exhaust channels are provided. The compressed gas enters the machine head through the air intake channel to drive the wind wheel to rotate, part of the gas is discharged, and part of the gas enters the cavity and enters the exhaust channel through the annular through grooves of the rotating shaft, the shaft sleeve and the bearing seat for discharge, which can bring out the heat generated by the bearing, greatly reduce the temperature of the bearing, extend its service life, and improve the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] Figure 2 It is a schematic cross-sectional view of the wind wheel of the present invention.

[0012] Figure 3 For the present invention Figure 1 AA view of the .

[0013] Figure 4 It is a schematic structural diagram of the end cover of the present invention.

[0014] In the figure: 1. transfer vehicle; 2. bearing seat; 3. support plate; 4. telescope; 5. clamping plate; 6. anti-slip pad; 7. motor; 8. screw rod. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] See also Figure 1-4The present invention discloses a dental handpiece with an efficient heat dissipation structure, comprising a handle 1 and a handpiece 2 arranged at one end of the handle 1, wherein an air intake channel 1.1 and an exhaust channel 1.2 are arranged in the handle 1, the handpiece 1 is hollow inside, the air intake channel 1.1 and the exhaust channel 1.2 are connected to the inside of the handpiece 1, a wind wheel 3, two rotating shafts 4 and a bearing 6 are arranged inside the handpiece 2, the bearing 6 is fixed by a bearing seat 5 and is respectively arranged on the upper and lower sides of the wind wheel 3, the bearing seat 5 is fixed on the inner wall of the handpiece 2, the rotating shaft 4 is a hollow shaft, and the rotating shaft 4 is respectively It is coaxially connected to the upper and lower ends of the wind wheel 3, that is, the axis of the wind wheel 3 and the axis of the rotating shaft 4 are coaxial, the axis extends up and down, and the rotating shaft 4 is rotatably connected through the sleeve 7 and the bearing 6, that is, the sleeve 7 is sleeved on the outer wall of the rotating shaft 4, and the sleeve 7 is arranged on the inner ring of the bearing 6. The rotating shaft 4 at the upper end extends to the upper side of the bearing 6 and is open, and the rotating shaft 4 at the lower end extends to the outside of the machine head 2 and is connected with a needle 9. The rotating shaft 4 at the lower end is closed above the connection with the needle 9, and the rotating shaft 4 is provided with an opening on the side wall below the lower side bearing 6. Air baffles 8 are provided above the bearing 6 on the upper side of the wind wheel 3 and below the bearing 6 on the lower side of the wind wheel 3. The air baffles 8 are used to block the gas from entering the bearing 6 and blow away the lubricating material in the bearing 6. The bearing seat 5 and the shaft sleeve 7 are provided with an annular through groove 5.1 connecting the upper and lower parts of the bearing 6. Two exhaust passages 1.2 are provided, one exhaust passage 1.2 connects to the area below the upper bearing 6 and part of the wind wheel 3, and the other exhaust passage 1.2 connects to the area above the lower bearing 6 and part of the wind wheel 3. The wind wheel 3 includes end plates 3.1 at the upper and lower ends and a plurality of grooves 3.2 between the end plates 3.1. The end plates 3.1 are provided with through holes 3.3 corresponding to the rotating shaft 4, that is, the diameter of the through holes 3.3 is the same as the inner hole diameter of the rotating shaft 4. The rotating shaft 4 is connected to the outer side of the end plates 3.1, that is, the rotating shaft 4 is buckled on the through holes 3.3. A plurality of grooves 3.2 are arranged in a ring shape along the circumferential direction, and a cavity 3.4 is formed inside the grooves 3.2. A through groove 3.5 communicating with the cavity 3.4 is arranged on the groove walls corresponding to the grooves 3.2 and the air inlet channel 1.1.

[0017] When the present invention is implemented, an end cover 10 is provided at the upper end of the machine head 2, the end cover 10 is threadedly connected to the inner wall of the machine head 2, and a sealing ring is provided between the end cover 10 and the machine head 2. The air baffle 8 above the bearing 6 on the upper side of the wind wheel 3 is provided on the lower surface of the end cover 10, that is, the air baffle 8 is connected to the lower surface of the end cover 10 through a hanging plate, and the air baffle 8 below the bearing 6 on the lower side of the wind wheel 3 is fixed to the lower wall of the machine head 2 through the hanging plate, and the air baffle 8 is an annular thin plate, and the width of the annular thin plate is slightly larger than the distance between the inner ring and the outer ring of the bearing 6, so as to prevent the compressed gas from entering the bearing 6 and blowing away the lubricating material of the bearing 6.

[0018] The needle 9 of the present invention is detachably connected to the shaft 4, and the needle 9 is sleeved in the shaft 4, which can be an interference fit or fixedly connected by a pin. A sealing ring is arranged between the shaft 4 at the lower end of the wind wheel 3 and the lower wall of the head 2.

[0019] When the present invention is working, compressed air enters the machine head through the air inlet channel of the handle, impacts the groove of the wind wheel, drives the wind wheel and the rotating shaft to rotate on the bearing, and part of the compressed gas drives the wind wheel and is discharged through the exhaust channel. When part of the compressed gas impacts the wind wheel groove, it enters the cavity through the through groove on the groove, and enters the upper rotating shaft and the lower rotating shaft through the through hole, and then passes through the annular through groove of the bearing seat and the shaft sleeve, and is finally discharged through the exhaust channel. When the compressed gas passes through the annular through groove of the bearing seat and the shaft sleeve, it can take away the heat generated by the bearing, thereby reducing the temperature of the bearing and extending its service life.

[0020] Finally, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

Claims

1. A dental handpiece with an efficient heat dissipation structure, comprising a handle and a handpiece disposed at one end of the handle, wherein an air inlet channel and an air exhaust channel are disposed in the handle, the interior of the handpiece is hollow, and the air inlet channel, the air exhaust channel and the interior of the handpiece are connected, characterized in that: The wind wheel, two rotating shafts and bearings are arranged inside the head. The bearings are fixed by bearing seats and are respectively arranged on the upper and lower sides of the wind wheel. The rotating shaft is a hollow shaft. The rotating shaft is coaxially connected to the upper and lower ends of the wind wheel respectively. The rotating shaft is rotatably connected through a sleeve and a bearing. The rotating shaft at the upper end extends to the upper side of the upper bearing and is open. The rotating shaft at the lower end extends to the outside of the head and is connected with a needle. The rotating shaft at the lower end is closed above the connection with the needle, and an opening is opened on the side wall below the lower bearing. Air baffles are arranged above the bearing on the upper side of the wind wheel and below the bearing on the lower side of the wind wheel. An annular through groove connecting the upper and lower sides of the bearing is arranged on the bearing seat and the sleeve. Two exhaust channels are arranged, one exhaust channel is connected to the area below the upper bearing of the wind wheel, and the other exhaust channel is connected to the area above the lower bearing of the wind wheel. The wind wheel includes end plates at the upper and lower ends and multiple grooves between the two end plates. Through holes corresponding to the rotating shaft are arranged on the end plates. The multiple grooves are arranged in a ring shape along the circumferential direction to enclose a cavity inside. A through groove connected to the cavity is arranged on the groove wall corresponding to the groove and the air inlet channel.

2. The dental handpiece with a high-efficiency heat dissipation structure according to claim 1, characterized in that: An end cover is arranged at the upper end of the machine head, the end cover is threadedly connected to the inner wall of the machine head, and a sealing ring is arranged between the end cover and the machine head.

3. The dental handpiece with a high-efficiency heat dissipation structure according to claim 2, characterized in that: The air baffle plate above the bearing on the upper side of the wind wheel is arranged on the lower surface of the end cover, and the air baffle plate below the bearing on the lower side of the wind wheel is fixed to the inner lower wall of the machine head.

4. The dental handpiece with a high-efficiency heat dissipation structure according to claim 1, characterized in that: The turning needle and the rotating shaft are detachably connected.

5. The dental handpiece with a high-efficiency heat dissipation structure according to claim 1, characterized in that: A sealing ring is arranged between the rotating shaft at the lower end of the wind wheel and the machine head.

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