CN107240973B

CN107240973B - Direct cooling type machine head

Info

Publication number: CN107240973B
Application number: CN201610182397.XA
Authority: CN
Inventors: 李锺建
Original assignee: Micro Networks Ltd
Current assignee: Micro Networks Ltd
Priority date: 2016-03-28
Filing date: 2016-03-28
Publication date: 2020-01-14
Anticipated expiration: 2036-03-28
Also published as: CN107240973A

Abstract

The present invention relates to a handpiece formed with a direct-cooling type miniaturized driving portion, including: an outer case configured to be held by a hand; the iron core is cylindrical and is provided with a cooling hole in a penetrating way on the outer side; a cylindrical water pipe through which water and air pass and a cylindrical flow pipe through which air flows; a rotor formed of a cylindrical magnetic body; a PCB having a cylindrical shape such that the cooling pipe and the flow pipe are communicated; a front shell having a discharge port formed through an outer peripheral surface thereof and an inner side formed through a front-to-rear direction; a bearing cap formed with a through hole into which a front end of the cooling pipe is introduced; a front cover fixing the cooling pipe and the flow pipe; a rear cover having a power terminal formed at one side thereof for supplying current to the PCB; and a rear case relaying supply of electric current, air and water supplied from the outside. Thus, high heat generated when the head is operated can be effectively cooled, and the head is prevented from being overheated to shorten the life or from generating vibration and noise.

Description

Direct cooling type machine head

Technical Field

The present invention relates to a handpiece having a directly cooled and miniaturized driving part, and more particularly, to a directly cooled handpiece which can effectively cool heat generated from the handpiece by partitioning an outer case and an iron core and fixing the iron core through a PCB and a bearing cap after the separation of the outer case and the iron core in order to cool the heat generated during the operation of the handpiece.

Background

In general, a handpiece is mainly used in a field where precision machining is required, such as a dental technique used for cutting or polishing teeth in dentistry, nail art used for trimming nails in a nail shop for nail care, and a fine worker for machining a gem or the like.

At this time, a high-speed motor that receives a power source to operate at about 40,000rpm is provided on the head, and thus excessive heat must be generated while the high-speed motor operates.

In order to cool the heat generated by the operation of the high-speed motor, a method of injecting saline solution, a method of using electric current, a method of using air, or the like has been used.

However, in the conventional method using saline solution as described above, the pipe for supplying saline solution is formed outside the core, and the pipe formed outside indirectly cools the heat generated from the high-speed motor, so that the effect of cooling the heat of the high-speed motor is very small, and the saline solution needs to be continuously injected, and the method using electric current has a complicated structure, and the effect of cooling the heat generated from the high-speed motor is reduced.

Further, in the conventional air system, since the air does not flow smoothly, only the air around the rotating impeller can be cooled, and the inside of the head and the high-speed motor cannot be cooled as a whole.

Therefore, there has been a problem that vibration and noise are generated when the high-speed motor of the head is operated because heat generated when the high-speed motor of the head is operated cannot be effectively cooled.

In order to remedy the above-mentioned drawbacks, the present applicant has developed registered patent No. 10-1461992, which provides a handpiece formed with a direct-cooling type miniaturized driving part for cooling high heat generated from the handpiece by passing air and water through an iron core, and the present invention provides an improvement of the registered patent No. 10-1461992.

Disclosure of Invention

Technical problem

The present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a direct cooling type handpiece which can effectively cool heat generated from the handpiece by separating an outer case from an iron core and fixing the iron core by a PCB and a bearing cap after the iron core is separated from the outer case in order to cool the heat generated during the operation of the handpiece.

Technical scheme

In order to achieve the above object, the present invention provides a direct cooling type head, comprising: an outer case formed in a rod shape and configured to be held by a hand; a cylindrical core inserted into the inner circumferential surface of the outer case, having a coil wound around the inner circumferential surface thereof, and having a cooling hole formed therethrough on the outer side thereof; a cooling pipe having a cylindrical shape and inserted into the cooling hole formed in the core to allow water and air to pass therethrough, and a flow pipe having a cylindrical shape to allow air to flow toward a side of the outer case spaced from the core; a rotor formed of a cylindrical magnetic body, inserted into the core, and having transmission shafts formed at both sides thereof to extend forward and backward; a PCB which is cylindrical, is inserted into the transmission shaft at one side of the iron core to transmit current, and is closely attached to the iron core to support the iron core, so that the cooling pipe and the flowing pipe are communicated; a pair of bearings inserted into and coupled to the transfer shaft and supporting rotation of the rotor; a coupling formed in front of the rotor and coupled with the transfer shaft; a front housing coupled to the front of the outer housing, having outlets formed through an outer circumferential surface thereof for spraying water and air supplied through the cooling pipe, and having an inner side formed through the front housing from a front side to a rear side thereof for inserting the transmission shaft and the coupling; a bearing cover formed at the other side of the core closely attached to the PCB, centrally accommodating a bearing, protruding to the outside to support one side of the core, and formed with a through hole for introducing the front end of the cooling tube; a front cover formed at one side of the PCB, fixing a cooling pipe and a flow pipe; a rear cover formed at one side of the front cover, one side being formed with a power terminal for supplying current to the PCB; and a rear case coupled to a rear of the outer case to relay supply of electric current, air and water supplied from the outside.

Technical effects

As described above, according to the present invention, air supplied from the flow tube flows to the space partitioned by the outer case and the core while passing water and air through the cooling hole of the core, thereby effectively cooling high heat generated when the head is operated, and preventing overheating of the head, shortening of the life, or occurrence of vibration and noise.

Further, the illumination of the LED formed on the bearing cap is radiated to the outside through the through hole of the outer case, so that when the handpiece is used mainly in dentistry, nail shop, or the like using the handpiece, the visibility of the operator is ensured, thereby improving the convenience of use.

Drawings

Fig. 1 and 2 are explanatory views showing a preferred embodiment of a direct cooling type handpiece according to the present invention.

Description of the reference numerals

3: outer case 10: iron core

14: cooling hole 20: cooling pipe

25: flow tube 30: rotor

32: the transmission shaft 34: PCB (printed circuit board)

36: bearing 38: coupling device

40: front shell 42: air jet

44: ejection port 50: bearing cap

51: through-hole 52: guide groove

53: the placing groove 55: front cover

60: rear cover 64: power supply terminal

70: rear case 80: LED (light emitting diode)

81: wiring part

Detailed Description

Hereinafter, the details for carrying out the present invention will be described in more detail with reference to the drawings.

Referring to fig. 1 and 2, the direct cooling type handpiece according to the present invention includes an outer case 3 which is formed in a rod shape having an open front and rear and can be held by hand.

The radius of the periphery of the center of the outer case 3 is smaller than the radius of the periphery of the front and rear of the outer case 3, and a plurality of protrusions are formed on the outer peripheral surface of the rear of the outer case 3, so that the operator can stably hold the outer case 3 when holding the outer case 3 with the hand.

The core 10 is formed by inserting a coil serving as a rotary rotor into the inner peripheral surface of the outer case 3, and has a cylindrical shape, and a cooling hole 14 into which a cooling pipe 20 described later is inserted is formed to penetrate through the outer side.

This is to supply air to a portion where the core 10 is separated from the inner circumferential surface of the outer case 3 through a flow tube 25 described later.

The cooling pipe 20 is formed in a cylindrical shape inserted into the cooling hole 14 formed in the core 10 to allow water and air to pass therethrough, and the flow pipe 25 is formed in a cylindrical shape to allow air to flow from the side of the outer case 3 spaced apart from the core 10.

That is, the cooling pipe 20 supplies water and air used in the operation of the machine head to the tip of the outer case 3, and the flow pipe 25 flows the air to the portion of the outer case 3 separated from the core 10, and transmits cold air generated by the air and the water to the core 10, thereby cooling high heat generated when the core 10 and a rotor 30 described later are operated.

The rotor 30 is inserted into the core 10, has transmission shafts 32 formed on both sides thereof to extend forward and backward, and is formed of a cylindrical magnetic material.

Preferably, the rotor 30 is inserted into the inner circumferential surface of the core 10 at a distance, and is operated at about 40,000rpm in response to a power source, and when the rotor 30 and the core 10 are operated at 40,000rpm or less, teeth cannot be cut smoothly by the dental handpiece 2, and when the rotor 30 and the core 10 are operated at 40,000rpm or more, heat is excessively generated from the rotor 30 and the core 10, and the rotor 30 and the core 10 are damaged or broken.

The PCB 34 includes a cylindrical shape, and is inserted into the transmission shaft 32 on one side of the core 10 to transmit current, and closely contacts the core 10 to support the core 10 so that the cooling pipe 20 and the flow pipe 25 are penetrated.

The PCB 34 transmits a current to the core 10 and the rotor 30, and also transmits a current to a wiring portion 81 of the LED 80, which will be described later.

The conveyor includes a pair of bearings 36 inserted into and coupled to the conveying shaft 32, and rotatably supporting the rotor 30.

Further, a coupling 38 is provided, which is formed in front of the rotor 30, is coupled to the transmission shaft 32, and, although not shown, a shaft and a turbine are sequentially connected to the front of the coupling 38, so that the bit of the handpiece is rotated and activated.

The cooling device further includes a front housing 40 coupled to the front of the outer housing 3, having an outer peripheral surface through which a discharge port 42 for discharging water and air received through the cooling pipe 20 is formed, and an inner side through which the transmission shaft 32 and the coupling 38 are inserted from the front to the rear.

In this case, the ejection ports 42 are preferably formed in the front case 40, but a plurality of them may be formed depending on the number of the cooling pipes 20.

And, a bearing cover 50 formed at the other side of the core 10 closely contacting the PCB 34, and centrally received in the bearing 36 rotating at the other side of the core 10 to support the transfer shaft 32, and outwardly protruded to support one side of the core 10, and formed with a through hole 51 into which the front end of the cooling tube 20 is introduced, and a guide groove 52 to flow air supplied through a partitioned portion of the outer case 3 and the core 10 to the opposite side.

The cooling device further includes a front cover 55 formed on one side of the PCB 34 to fix the cooling pipe 20 and the flow pipe 25, and a rear cover 60 formed on one side of the front cover 55 and having a power terminal 64 formed on one side thereof to supply current to the P CB 34.

Further, a rear case 70 is provided to be coupled to the rear of the outer case 3 to transfer the supply of electric current, air and water from the outside, and although not shown in the drawings, the rear case 70 is used by being connected to a power supply and a connector having a supply hose formed thereon, and the connector may be used by being connected to a conventional connector or a connector of another type.

Accordingly, the present invention allows water and air to pass through the cooling holes 14 of the core 10 and allows the air supplied from the flow tube 25 to flow into the space partitioned by the outer case 3 and the core 10, thereby effectively cooling the high heat generated during the operation of the head and preventing the head from overheating and shortening the life or generating vibration and noise.

A mounting groove 53 is formed in front of the bearing cover 50, a wiring portion 81 for supplying current to the LED 80 is formed in the mounting groove 53, and the wiring portion 81 extends toward the rear case 70 to receive the current supply.

The wiring section 81 is subjected to a water repellent treatment.

A through hole (3h) is formed to penetrate from the front to the rear of the side of the housing 3 where the LED 80 is formed, so that illumination generated from the LED 80 is irradiated to the outside.

That is, the illumination of the LED 80 formed on the bearing cap 50 is radiated to the outside through the through hole (3h) of the outer case 3, so that when the handpiece is used, such as a dental department or a nail shop, which mainly uses the handpiece, the visibility of the operator is ensured, thereby improving the convenience of use.

The wiring portion 81 is configured to be introduced into the protective body 56 formed on the front cover without an additional space for supplying current to the LED 80, so that the handpiece is miniaturized, the worker easily holds the handpiece, and the wiring portion 81 is protected by the protective body 56, thereby realizing stable supply of current.

In the drawing, although one LED 80 is illustrated, a plurality of LEDs may be formed according to the luminance adjustment of the illumination.

Claims

1. A direct-cooled handpiece, comprising:

an outer case (3) formed in a rod shape and configured to be held by a hand:

a cylindrical iron core (10) which is inserted into the inner peripheral surface of the outer case (3) with a space therebetween, has a coil wound around the inner peripheral surface thereof, and has a cooling hole (14) formed therethrough on the outside thereof;

a cooling pipe (20) having a cylindrical shape inserted into a cooling hole (14) formed in the core (10) so that water and air pass therethrough, and a flow pipe (25) having a cylindrical shape so that air flows toward a side of the outer case (3) spaced from the core (10):

a rotor (30) formed of a cylindrical magnetic body, inserted into the core (10), and having transmission shafts (32) formed on both sides thereof and extending forward and backward, respectively;

a cylindrical PCB (34) which is inserted into the transmission shaft (32) on one side of the iron core (10) to transmit current, and supports the iron core (10) by being closely attached to the iron core (10) so that the cooling pipe (20) and the flow pipe (25) are communicated;

a pair of bearings (36) inserted into and coupled to the transmission shaft (32) and supporting the rotation of the rotor (30);

a coupling (38) formed in front of the rotor (30) and coupled to a transmission shaft (32);

a front housing (40) coupled to the front of the outer housing (3), having a discharge port (42) formed through the outer circumferential surface thereof for discharging water and air supplied through the cooling pipe (20), and having an inner side formed through the front and rear thereof for inserting the transmission shaft (32) and the coupling (38);

a bearing cover (50) formed at the other side of the core (10) closely attached to the PCB (34), centrally accommodating a bearing (36), protruding outside to support one side of the core (10), and formed with a through hole (51) into which the front end of the cooling tube (20) is introduced;

a front cover (55) formed on one side of the PCB (34) and fixing the cooling pipe (20) and the flow pipe (25);

a rear cover (60) formed at one side of the front cover (55), and having a power terminal (64) formed at one side thereof for supplying current to the PCB (34);

a rear case (70) combined to be formed at the rear of the outer case (3) to relay the supply of current, air and water supplied from the outside;

wherein a mounting groove (53) is formed in front of the bearing cap (50), an LED (80) and a wiring part (81) for supplying current to the LED (80) are formed in the mounting groove (53), and the wiring part (81) extends toward the rear case (70) to receive the supply of current,

the wiring part (81) carries out waterproof treatment;

the wiring section (81) is configured to introduce a protective body formed at the front cover (55) without an additional space for supplying current to the LED (80), and the protective body protects the wiring section (81).

2. The direct-cooled handpiece of claim 1, wherein:

a through hole (3h) penetrating from the front to the rear is formed on one side of the outer case (3) on which the LED (80) is formed, so that illumination generated from the LED (80) is irradiated to the outside.

3. The direct-cooled handpiece of claim 1, wherein:

the bearing cap (50) is formed with a guide groove (52), and the guide groove (52) allows air supplied from a partition portion of the outer case (3) and the core (10) to flow in a reverse direction.