阅读说明：本技术 用于高速涡轮牙科手机的气流悬浮机芯组件及牙科手机 (Airflow suspension movement assembly for high-speed turbine dental handpiece and dental handpiece ) 是由 李强 于 2021-07-30 设计创作，主要内容包括：本发明涉及医疗器械技术领域,具体是气流悬浮机芯组件及牙科手机,气流悬浮机芯组件包括机头壳体、涡轮组件和轴承,轴承包括套在转轴外且与转轴之间形成第一间隙的上轴套和下轴套,上、下轴套分别与涡轮的上、下端面平行设置并形成第二间隙,上轴套和下轴套均设有环形气槽、以及若干第一节流孔和第二节流孔,第一节流孔和第二节流孔的一端均连通环形气槽,另一端分别连通第一间隙和第二间隙；工作时通过压缩空气在转轴的径向形成套筒状气膜,在叶轮的上、下两端面形成平垫状气膜,从而使涡轮组件在径向和轴向均实现悬浮状态,涡轮组件在高速转动时的摩擦力小,噪音小,发热量低,不易磨损,寿命长,且更易加工制造和装配。(The invention relates to the technical field of medical instruments, in particular to an airflow suspension movement assembly and a dental handpiece, wherein the airflow suspension movement assembly comprises a handpiece shell, a turbine assembly and a bearing, the bearing comprises an upper shaft sleeve and a lower shaft sleeve which are sleeved outside a rotating shaft and form a first gap with the rotating shaft, the upper shaft sleeve and the lower shaft sleeve are respectively arranged in parallel with the upper end surface and the lower end surface of a turbine and form a second gap, the upper shaft sleeve and the lower shaft sleeve are respectively provided with an annular air groove and a plurality of first throttling holes and second throttling holes, one ends of the first throttling holes and the second throttling holes are respectively communicated with the annular air groove, and the other ends of the first throttling holes and the second throttling holes are respectively communicated with the first gap and the second gap; during operation, the sleeve-shaped air film is formed in the radial direction of the rotating shaft through compressed air, and the pad-shaped air films are formed on the upper end face and the lower end face of the impeller, so that the turbine assembly is in a suspension state in the radial direction and the axial direction, the friction force of the turbine assembly in high-speed rotation is small, the noise is low, the heat productivity is low, the turbine assembly is not easy to wear, the service life is long, and the processing, the manufacturing and the assembling are easier.)

1. An air flow suspension movement assembly for a high-speed turbine dental handpiece comprises a handpiece shell, a turbine assembly and a bearing, wherein the turbine assembly is rotatably arranged in the handpiece shell, the bearing is used for supporting the turbine assembly, the turbine assembly comprises a rotating shaft and a turbine fixedly sleeved outside the rotating shaft, and the air flow suspension movement assembly is characterized in that the bearing comprises an upper shaft sleeve and a lower shaft sleeve which are axially arranged at the upper end and the lower end of the turbine at intervals, the upper shaft sleeve and the lower shaft sleeve are both fixed in the handpiece shell and sleeved outside the rotating shaft to form a first gap with the rotating shaft, the lower end surface of the upper shaft sleeve and the upper end surface of the lower shaft sleeve are respectively arranged in parallel with the upper end surface and the lower end surface of the turbine to form a second gap, the upper shaft sleeve and the lower shaft sleeve are both provided with an annular air groove and a plurality of first throttling holes and second throttling holes which are circumferentially distributed at even intervals, one ends of the first throttling holes and the second throttling holes are both communicated with the annular air groove, the other end communicates first clearance and second clearance respectively, is equipped with the bearing intake pipe that supplies compressed air to get into two annular air tanks in the aircraft nose casing, and the second clearance that corresponds is communicated to the one end in first clearance, and the other end communicates exhaust passage.

2. The air flow suspension core assembly for the high-speed turbine dental handpiece of claim 1, wherein a turbine air inlet pipe for blowing compressed air to the turbine to drive the turbine to rotate and an exhaust pipe for exhausting air are further arranged in the handpiece shell, and the turbine air inlet pipe and the bearing air inlet pipe are communicated or mutually independent channels.

3. The air flow suspension movement assembly for the high-speed turbine dental handpiece of claim 2, wherein the turbine air inlet pipe and the bearing air inlet pipe are communicated passages, an air inlet manifold is arranged in the handpiece shell, the turbine air inlet pipe and the bearing air inlet pipe are both communicated with the air inlet manifold, and the bearing air inlet pipe is divided into an upper bearing air inlet pipe and a lower bearing air inlet pipe.

4. The air suspension movement assembly for a high-speed turbine dental handpiece of claim 1, wherein the peripheries of the upper shaft sleeve and the lower shaft sleeve are respectively connected with the inner wall of the handpiece shell in a sealing manner through at least two sealing rings, and at least one sealing ring is respectively arranged above and below each annular air groove.

5. The airflow suspension core assembly for the high-speed turbine dental handpiece of claim 1, further comprising a brake device for braking the turbine assembly, wherein the brake device comprises an elastic brake rubber ring arranged above the upper shaft sleeve and/or below the lower shaft sleeve, the brake rubber ring is fixed to the handpiece shell and positioned in the exhaust passage, an inner ring of the brake rubber ring can be elastically abutted against the rotating shaft in a natural state so as to play a braking role, and the brake rubber ring can be blown up by airflow so as to be separated from the rotating shaft when the exhaust passage exhausts air.

6. The air suspension cartridge assembly for a high-speed turbine dental handpiece of claim 1, wherein the shaft includes a shaft and two sleeves fixedly attached to the outside of the shaft, the two sleeves being axially spaced and corresponding to the upper sleeve and the lower sleeve, respectively, the upper sleeve and the lower sleeve being respectively attached to the outside of the corresponding sleeves and forming the first gap with the outside wall of the sleeves.

7. The air suspension cartridge assembly for a high-speed turbine dental handpiece of claim 1, wherein the first orifice is disposed in a radial direction of the corresponding bushing and the second orifice is disposed in an axial direction of the corresponding bushing.

8. The air flow suspension movement assembly for the high-speed turbine dental handpiece of claim 1, wherein the upper end of the handpiece shell is provided with a cap which can be detachably connected, the inner cavity of the handpiece shell is sequentially divided into an upper shaft sleeve cavity, a turbine cavity and a lower shaft sleeve cavity with successively reduced diameters from top to bottom, the lower end of the upper shaft sleeve is supported on the bottom shoulder of the upper shaft sleeve cavity, the lower end of the lower shaft sleeve is supported on the bottom shoulder of the lower shaft sleeve cavity, and the upper end surface of the lower shaft sleeve and the bottom shoulder of the turbine cavity are flush and are matched with the lower end surface of the turbine together to form the second gap.

9. A dental handpiece comprising a handle and a handpiece mounted at one end of the handle, the handpiece comprising an air suspension cartridge assembly according to any one of claims 1 to 8.

Technical Field

The invention relates to the technical field of medical instruments, in particular to an airflow suspension movement assembly for a high-speed turbine dental handpiece and the dental handpiece.

Background

The high-speed turbine dental handpiece is a common medical instrument in stomatology department, and the working principle of the high-speed turbine dental handpiece is that compressed air is utilized to blow a turbine to rotate at a high speed, so that a rotating shaft and a lathe needle are driven to rotate at a high speed, the rotating speed is usually more than 20 ten thousand revolutions per minute, and the high-speed turbine dental handpiece is used for cutting a tooth body to remove decayed tissues, or preparing porcelain teeth, and also can be used for grinding false teeth and the like. High-speed turbine dental handpieces are available in a wide variety of designs, including varying quality, varying appearance, and a wide variety of additional functions such as a stylus, a screw-down, and a button; cooling methods include single-hole spraying, double-hole spraying, three-hole spraying and four-hole spraying; the lamp has a lighting function; has a blowing function; has the function of preventing suck-back; the device is provided with a quick connector; the torque also has a large value and a small value, and the mini-type handpiece is specially used for posterior teeth and children, and the other aspects even have automatic pressure limiting and the like. Based on the function and working environment of the dental handpiece, the cartridge assembly of the dental handpiece must meet the requirements of high rotational speed, low noise and long life, wherein the bearing plays a critical role in the cartridge assembly of the dental handpiece.

At present, ball bearings are mostly adopted in the movement components of the dental handpiece, and the following problems are mainly caused: (1) the ball bearing has large friction force when rotating at high speed, so that the power loss is large, the rotating speed of a machine core assembly can be limited, and the ball bearing has large noise, large heat productivity, easy abrasion and short service life; (2) in addition, because the internal air pressure of the dental handpiece is high when the dental handpiece is used, gas can overflow from the ball bearing, lubricating substances in the ball bearing can be carried away in the overflow process, and the lubricating substances can overflow to the oral cavity when the dental handpiece is used, so that the dental handpiece is damaged; on the other hand, the overflow of the lubricating substance can lead to dry grinding of the ball bearing, and the ball bearing is quickly worn, so that the temperature of the ball bearing is quickly raised, and great influence is generated on the use of the dental handpiece; (3) because the dental handpiece is small in size, the ball bearing used in the dental handpiece has high precision requirement, the whole manufacturing cost of the dental handpiece is greatly influenced by the process difficulty, the assembly is inconvenient, and the manufacturing efficiency is influenced.

Disclosure of Invention

In order to overcome the defects of the prior art, one of the tasks of the invention is to provide an airflow suspension movement assembly for a high-speed turbine dental handpiece, wherein a sleeve-shaped air film is formed in the radial direction of a rotating shaft by compressed air during working, and flat cushion-shaped air films are formed on the upper end surface and the lower end surface of an impeller, so that the radial direction and the axial direction of the turbine assembly are supported, and the turbine assembly is enabled to be in a suspension state in the radial direction and the axial direction and not to be in direct contact with a shaft sleeve; the second task of the invention is to provide a dental handpiece adopting the airflow suspension movement assembly.

One of the tasks of the invention is realized by the following technical scheme:

an air flow suspension movement assembly for a high-speed turbine dental handpiece comprises a handpiece shell, a turbine assembly and a bearing, wherein the turbine assembly is rotatably arranged in the handpiece shell, the bearing is used for supporting the turbine assembly, the turbine assembly comprises a rotating shaft and a turbine fixedly sleeved outside the rotating shaft, the bearing comprises an upper shaft sleeve and a lower shaft sleeve which are axially arranged at the upper end and the lower end of the turbine at intervals, the upper shaft sleeve and the lower shaft sleeve are both fixed in the handpiece shell and sleeved outside the rotating shaft, a first gap is formed between the upper shaft sleeve and the rotating shaft, the lower end surface of the upper shaft sleeve and the upper end surface of the lower shaft sleeve are respectively arranged in parallel with the upper end surface and the lower end surface of the turbine to form a second gap, the upper shaft sleeve and the lower shaft sleeve are both provided with an annular air groove and a plurality of first throttling holes and second throttling holes which are circumferentially distributed at even intervals, one ends of the first throttling holes and the second throttling holes are both communicated with the annular air groove, and the other ends of the first gap and the second throttling holes are respectively communicated with the first gap and the second throttling holes, the inside of the machine head shell is provided with a bearing air inlet pipe for compressed air to enter the two annular air grooves, one end of the first gap is communicated with the corresponding second gap, and the other end of the first gap is communicated with the exhaust channel.

As a preferable technical scheme, a turbine air inlet pipe and an exhaust pipe are further arranged in the handpiece shell, the turbine air inlet pipe is used for blowing compressed air to the turbine to drive the turbine to rotate, the exhaust pipe is used for exhausting air, and the turbine air inlet pipe and the bearing air inlet pipe are communicated or mutually independent channels.

According to the preferable technical scheme, the turbine air inlet pipe and the bearing air inlet pipe are communicated channels, an air inlet main pipe is arranged in the handpiece shell, the turbine air inlet pipe and the bearing air inlet pipe are both communicated with the air inlet main pipe, and the bearing air inlet pipe is divided into an upper bearing air inlet pipe and a lower bearing air inlet pipe.

As a preferred technical scheme, the peripheries of the upper shaft sleeve and the lower shaft sleeve are respectively in sealing connection with the inner wall of the machine head shell through at least two sealing rings, and at least one sealing ring is arranged above and below each annular air groove.

As preferred technical scheme, air suspension core assembly still including be used for right turbine assembly carries out brake braking's brake equipment, brake equipment is including setting up go up the axle sleeve top and/or the elasticity brake rubber ring of axle sleeve below down, the brake rubber ring is fixed in the aircraft nose casing just is located in the exhaust passage, the inner circle of brake rubber ring can elasticity butt under natural state be in thereby can play the braking effect in the pivot, thereby can blow by the air current when exhaust passage exhausts and break away from with the pivot.

As a preferred technical scheme, the rotating shaft comprises a shaft rod and two sleeves fixedly sleeved outside the shaft rod, the two sleeves are axially arranged at intervals and respectively correspond to the upper shaft sleeve and the lower shaft sleeve, and the upper shaft sleeve and the lower shaft sleeve are respectively sleeved outside the corresponding sleeves and form the first gap with the outer side wall of the sleeve.

Preferably, the first orifice is provided in a radial direction of the corresponding sleeve, and the second orifice is provided in an axial direction of the corresponding sleeve.

As preferred technical scheme, the upper end of aircraft nose casing is equipped with the block of dismantling the connection, and the inner chamber of aircraft nose casing divide into upper shaft sleeve chamber, turbine chamber and the lower shaft sleeve chamber that the diameter reduces in proper order from last to down in proper order, the lower extreme of upper shaft sleeve supports on the bottom convex shoulder in upper shaft sleeve chamber, the lower extreme of lower shaft sleeve supports on the bottom convex shoulder in lower shaft sleeve chamber, and the up end of lower shaft sleeve and the bottom convex shoulder parallel and level in turbine chamber just form with the lower terminal surface cooperation of turbine jointly the second clearance.

The second task of the invention is realized by the following technical scheme:

a dental handpiece comprises a handle and a handpiece arranged at one end of the handle, wherein the handpiece comprises the airflow suspension movement assembly.

Compared with the prior art, the invention has the beneficial effects that: firstly, when the air flow suspension machine core assembly works, compressed air enters annular air grooves of an upper shaft sleeve and a lower shaft sleeve through a bearing air inlet pipe, then enters a first gap and a second gap through a first throttling hole and a second throttling hole of the corresponding shaft sleeve, and is discharged through an exhaust passage and an exhaust pipe, air flows flowing through the first gap and the second gap respectively form sleeve-shaped air films in the radial direction of a rotating shaft, flat cushion-shaped air films are formed on the upper end surface and the lower end surface of an impeller, the sleeve-shaped air films and the flat cushion-shaped air films respectively support a turbine assembly in the radial direction and the axial direction, and the turbine assembly realizes a suspension state in the radial direction and the axial direction without being directly contacted with the shaft sleeve, so that the turbine assembly has very small friction force, small power loss, high rotating speed, small noise, low heat productivity, difficult abrasion and long service life; the shaft sleeve of the airflow suspension movement assembly is not in direct contact with the turbine assembly during working, so that lubricating substances are not needed, and the problem caused by the overflow of the lubricating substances is avoided; the bearing of the air flow suspension movement assembly does not need a ball, so that the process difficulty and the assembly difficulty are lower, and the air flow suspension movement assembly is easier to process, manufacture and assemble; the turbine air inlet pipe and the bearing air inlet pipe can be communicated passages or mutually independent passages, if the communicated passages are adopted, the structure is simpler, the control is simple, the manufacturing cost is lower, if the mutually independent passages are adopted, the independent control can be realized respectively, the air supply of the bearing air inlet pipe is earlier than that of the turbine air inlet pipe during the use, and the air stopping is later than that of the turbine air inlet pipe, so that the turbine assembly is in a suspension state for a period of time before the turbine air inlet pipe supplies air to drive the turbine assembly to rotate, and the turbine assembly is still in the suspension state for a period of time after the turbine air inlet pipe stops supplying air, thereby ensuring that the turbine assembly cannot generate friction with the shaft sleeve during the initial rotation and the inertial rotation in the air stopping and braking processes; the sealing ring is arranged, so that compressed air in the annular air groove can be prevented from leaking, and the supporting strength of the sleeve-shaped air film and the flat cushion-shaped air film is increased; sixthly, the brake device is arranged, so that the brake can be rapidly carried out on the rotating shaft when the air supply of the bearing air inlet pipe is stopped; the sleeve is arranged, and the surface of the sleeve is more convenient to process, so that the processing process of the shaft lever can be simplified, and the processing cost of the shaft lever and the whole machine core is reduced; the performance, the service life, the manufacturing cost and the efficiency of the dental handpiece depend on the movement assembly to a great extent, and the bearing plays a key role in the movement assembly, so that the dental handpiece has better overall performance, small power loss, high rotating speed, low noise, low heat productivity, difficult abrasion, longer service life, lower manufacturing cost and higher manufacturing efficiency due to the adoption of the airflow suspension movement assembly.

The conception, specific structure and effects of the present invention will be further described in conjunction with the accompanying drawings to fully understand the objects, features and effects of the present invention.

Drawings

Fig. 1 is a schematic view of the external structure of an air suspension deck assembly in embodiment 1;

fig. 2 is a schematic view of the internal structure of the air suspension deck assembly in embodiment 1;

FIG. 3 is a schematic view of the upper or lower bushing of FIG. 2;

fig. 4 is a schematic structural view of the dental handpiece in embodiment 2.

Wherein: the dental handpiece comprises a handpiece shell 1, a turbine cavity 11, an exhaust channel 12, a cap 13, an upper shaft sleeve cavity 14, a lower shaft sleeve cavity 15, a rotating shaft 21, a shaft rod 211, a sleeve 212, a turbine 22, an upper shaft sleeve 31, a lower shaft sleeve 32, an annular air groove 301, a first throttle hole 302, a second throttle hole 303, a sealing ring 304, an exhaust channel 12, a first gap 41, a second gap 42, an air inlet manifold 5, an upper bearing air inlet pipe 51, a lower bearing air inlet pipe 52, a turbine air inlet pipe 53, an exhaust pipe 6, a brake rubber ring 7, a lathe needle 8, a dental handpiece 100, a handpiece 10 and a handle 20.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the description of the specific embodiments is intended to be illustrative of the invention and is not intended to limit the invention.

It should be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, and the description is for illustrative purposes only and is not intended to limit the present invention. The terms "upper", "lower", "inner", "outer" and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Example 1:

as shown in fig. 1-3, the air suspension movement assembly for a high-speed turbine dental handpiece comprises a handpiece housing 1, a turbine assembly rotatably disposed in the handpiece housing 1, and a bearing for supporting the turbine assembly, wherein the turbine assembly comprises a rotating shaft 21 and a turbine 22 fixedly sleeved outside the rotating shaft 21, the turbine 22 is disposed in a turbine cavity 11 in the handpiece housing 1, the rotating shaft 21 comprises a shaft 211 and two steel sleeves 212 fixedly sleeved outside the shaft 211, the lower end of the shaft is used for connecting a needle 8, the two sleeves 212 are axially spaced and disposed at upper and lower ends of the turbine 22 respectively, the bearing comprises an upper shaft sleeve 31 and a lower shaft sleeve 32 axially spaced and disposed at upper and lower ends of the turbine 22, both the upper shaft sleeve 31 and the lower shaft sleeve 32 are fixed in the handpiece housing 1 and sleeved outside the corresponding sleeves 212 to form a first gap 41 with the sleeves 212, the lower end face of the upper shaft sleeve 31 and the upper end face of the lower shaft sleeve 32 are respectively arranged in parallel with the upper end face and the lower end face of the turbine 22 to form a second gap 42, wherein one end of the first gap 41 is communicated with the second gap 42, the upper shaft sleeve 31 and the lower shaft sleeve 32 are respectively provided with an annular air groove 301, and a plurality of first throttle holes 302 and second throttle holes 303 which are uniformly distributed at intervals along the circumferential direction, the first throttle holes 302 are arranged along the radial direction of the corresponding shaft sleeve, the second throttle holes 303 are arranged along the axial direction of the corresponding shaft sleeve, one ends of the first throttle holes 302 and the second throttle holes 303 are respectively communicated with the annular air groove 301, and the other ends of the first throttle holes 41 and the second gap 42 are respectively communicated. An air inlet manifold 5 and an air outlet pipe 6 are arranged in the handpiece shell 1, the air inlet manifold 5 is branched into an upper bearing air inlet pipe 51, a lower bearing air inlet pipe 52 and a turbine air inlet pipe 53, wherein the upper bearing air inlet pipe 51 and the lower bearing air inlet pipe 52 are respectively used for filling compressed air into an upper shaft sleeve 31 and an annular air groove 301 of a lower shaft sleeve 32, the turbine air inlet pipe 53 is used for blowing the compressed air into a turbine 22 to drive the turbine 22 to rotate, the air outlet pipe 6 is communicated with a turbine cavity 11 and used for exhausting the turbine cavity 11, in addition, the upper end and the lower end of the handpiece shell 1 are also respectively provided with an air outlet channel 12 communicated with two first gaps 41 and the external environment, and the air outlet channel 12 can be an opening hole or a matching gap on the handpiece shell 1.

The air flow suspension movement assembly of the invention is shown in fig. 1, wherein arrows indicate air flow directions, when in operation, compressed air enters annular air grooves 301 of an upper shaft sleeve 31 and a lower shaft sleeve 32 through an air inlet manifold 5, an upper bearing air inlet pipe 51 and a lower bearing air inlet pipe 52, then enters a first gap 41 and a second gap 42 through a first throttling hole 302 and a second throttling hole 303 corresponding to the shaft sleeves, the air flow can be discharged through a gas discharge passage 12 and a gas discharge pipe 6 because the first gap 41 is communicated with a gas discharge passage 12 and the second gap 42 is communicated with a turbine cavity 11, the air flow flowing through the first gap 41 and the second gap 42 respectively forms sleeve-shaped air films in the radial direction of a rotating shaft 21 and forms flat cushion-shaped air films on the upper end surface and the lower end surface of an impeller, the sleeve-shaped air films and the flat cushion-shaped air films respectively realize radial and axial support for a turbine 22 assembly, the turbine 22 assembly realizes a suspension state in the radial direction and the axial direction without directly contacting with the shaft sleeves, therefore, the friction force of the turbine 22 component in high-speed rotation is very small, the power consumption loss is small, the rotating speed is high, the noise is low, the heat productivity is low, the abrasion is not easy to occur, and the service life is long; moreover, the sleeve and the turbine 22 assembly do not directly contact during operation, so that no lubricating substance is needed, and the problem caused by the overflow of the lubricating substance is avoided; in addition, because the bearing does not need balls, the process difficulty and the assembly difficulty are lower, and the bearing is easier to process, manufacture and assemble. In addition, in order to enable the supporting performance of the sleeve-shaped air film and the flat cushion-shaped air film to be better, two opposite surfaces forming the air films need to reach certain processing precision, and the distance meets specific requirements, the sleeve 212 is arranged outside the shaft rod 211 to be matched with the shaft sleeve to form the first gap 41, and the surface of the sleeve 212 is more convenient to process to the required processing precision, so that the processing technology of the shaft rod 211 can be simplified, and the processing cost of the shaft rod 211 and the whole machine core is reduced. In the embodiment, the turbine air inlet pipe 53 and the bearing air inlet pipe are communicated passages, namely the turbine air inlet pipe 53 and the bearing air inlet pipe supply air or stop air simultaneously, so that the mode has a simpler structure, is simple to control and has lower manufacturing cost; in other embodiments, the turbine air inlet pipe 53 and the bearing air inlet pipe can be mutually independent channels, and can be independently controlled, when in use, the air supply of the bearing air inlet pipe is earlier than that of the turbine air inlet pipe 53, and the air stop is later than that of the turbine air inlet pipe 53, so that the turbine 22 assembly is already in a suspended state for a period of time before the turbine air inlet pipe 53 supplies air to drive the turbine 22 assembly to rotate, and the turbine 22 assembly is still in the suspended state for a period of time after the turbine air inlet pipe 53 stops supplying air, so that friction between the turbine 22 assembly and the shaft sleeve cannot be generated during initial rotation and inertial rotation during the air-stop braking process.

The peripheries of the upper shaft sleeve 31 and the lower shaft sleeve 32 are respectively connected with the inner wall of the handpiece shell 1 in a sealing way through two sealing rings 304, and one sealing ring 304 is respectively arranged above and below each annular air groove 301. By providing the seal ring, the compressed air in the annular air groove 301 can be prevented from leaking out, thereby increasing the support strength of the sleeve-shaped air film and the flat cushion-shaped air film.

Airflow suspension core assembly is still including being used for right turbine 22 subassembly carries out brake braking's brake equipment, brake equipment is including setting up elasticity brake rubber ring 7 of upper shaft sleeve 31 top, brake rubber ring 7 is fixed in aircraft nose casing 1 just is located in exhaust passage 12, the inner circle of brake rubber ring 7 can elasticity butt under natural state be in thereby can play the brake effect in pivot 21, thereby can blow by the air current and break away from with pivot 21 when exhaust passage 12 exhausts.

The upper end of aircraft nose casing 1 is equipped with the block 13 that can dismantle the connection, and the inner chamber of aircraft nose casing 1 divide into diameter upper shaft sleeve chamber 14, turbine chamber 11 and lower shaft sleeve chamber 15 that reduce in proper order from last to down, the lower extreme of going up axle sleeve 31 supports on the bottom shoulder of upper shaft sleeve chamber 14, the lower extreme of axle sleeve 32 supports on the bottom shoulder of lower shaft sleeve chamber 15 down, and the up end of lower shaft sleeve 32 and the bottom shoulder parallel and level of turbine chamber 11 and the cooperation of the lower terminal surface with turbine 22 jointly form second clearance 42. The design makes the invention more convenient to assemble, the structure is more firm, and the support balance of the upper and lower flat cushion-shaped air films is considered.

Example 2:

as shown in fig. 4, a dental handpiece 100 includes a handpiece 20 and a handpiece 10 mounted on one end of the handpiece 20, the handpiece including the air suspension cartridge assembly of embodiment 1. Because the performance, the service life, the manufacturing cost and the efficiency of the dental handpiece depend on the movement assembly to a great extent, and the bearing plays a key role in the movement assembly, the dental handpiece of the invention has better overall performance, less power consumption loss, high rotating speed, low noise, low heat productivity, difficult abrasion, longer service life, lower manufacturing cost and higher manufacturing efficiency because of adopting the airflow suspension movement assembly.

Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.