TWI571354B - Improve the heat efficiency of the electric grinding hand tools - Google Patents

Description

Electric grinding hand tool for improving heat dissipation efficiency

The invention relates to an electric grinder hand tool, in particular to an electric grinder hand tool which is equipped with a heat dissipating fan between an electric motor and a circuit module to simultaneously provide heat dissipation to the electric motor and the circuit module to improve heat dissipation efficiency.

According to the improvement of the robot tool technology, many robot tool manufacturers gradually changed the pneumatic hand tool to electric power as the main power source to solve the problem that the pneumatic hand tool could not be used at high speed.

However, changing the robot tool from pneumatic to electric, the first thing that must be encountered is the heat dissipation efficiency of the component. In the past, pneumatically-operated robotic tools were able to exchange heat with working gas at the same time to prevent waste heat from accumulating in the robot tool. However, the electric manipulator tool is used to operate the electric motor to obtain the working power, if the machine The hand tool itself does not have a thermal convection design, which will cause the electric motor and its associated components to be prone to anomalies due to the accumulation of waste heat.

In this regard, today's robot tool manufacturers are all researching and improving the heat dissipation efficiency of hand tools, as disclosed in the Chinese Patent No. CN201371407Y patent and the European Patent No. EP1285727B1 patent, however, the above patents are in the robot tool. A fan is disposed in a casing, but the main heat dissipating object of the fan is an abrasive member of the robot tool to dissipate the waste heat generated during the high-speed rotation of the grinding member, but the electric hand tool is electrically operated. In addition to the waste heat generated by the abrasive parts, the electric motor and its associated control module will also The waste heat is generated. If the electric motor and its associated control module are not properly dissipated, the waste heat will still accumulate in the housing of the robot tool, and the temperature rise effect will occur, resulting in the electric motor and the control module being unable to Working at a better working temperature, it is prone to work abnormalities.

The main object of the present invention is to solve the heat dissipation problem derived from the conventional rotary hand tool from pneumatic to electric implementation.

To achieve the above object, the present invention provides an electric abrasive hand tool for improving heat dissipation efficiency, comprising a main body and a grinding assembly. The main body has a body and a grip extending from the body, and an accommodation space is formed in the body. The grinding assembly includes an electric motor located in the accommodating space and outputting power by a transmission shaft, a circuit module disposed in the same axial direction as the electric motor and connected to external electric power to control the operation of the electric motor, and defining the transmission shaft One end of the circuit module is a first transmission portion and the other end of the circuit module is a second transmission portion, and the second transmission portion is connected to the outside of the housing and is received by the second transmission. The part drives the grinding member that generates the grinding action. A heat dissipating fan disposed on the first transmission portion is disposed between the circuit module and the electric motor, and the heat dissipating fan has a substrate, a shaft portion disposed on the substrate and connected to the first transmission portion And a plurality of fan blades and a gas flow through hole which are arranged on the substrate in a radial direction of the shaft portion, and the main body of the main body has at least one air outlet corresponding to the blade position, and the main body body The main body of the electric motor and the electric motor are provided with at least one air inlet, so that the driving shaft of the electric motor is driven by the circuit module to synchronize the first transmission portion and the second transmission portion. An abrasive member and the heat dissipation fan, the blade rotates to introduce a cold airflow from the air inlet, the cold airflow does not enter the electric motor and flows along the surface of the electric motor, and the electric motor and the circuit are transmitted through the airflow through hole The operating heat generated by the module is discharged from the air outlet, and the circuit module has a side of the cooling fan to dissipate the circuit module to generate operating heat energy through the cold air introduced by the fan blade. Thermal element.

In an embodiment, the body of the main body has the air inlet respectively corresponding to the position of the circuit module and the electric motor.

In one embodiment, the circuit module includes a control unit disposed on the body and in the same axial direction as the electric motor, and a control unit disposed on the grip and connected to the control unit to obtain operating power from the external power. Power supply unit for power conversion.

In one embodiment, the electric motor is provided with a Palin in at least one of the first transmission portion and the second transmission portion.

In one embodiment, the substrate of the heat dissipation fan is located on a side of the heat dissipation fan facing the circuit module, and the blades are located on a side facing the electric motor.

In one embodiment, the substrate of the heat dissipation fan is located on a side of the heat dissipation fan facing the electric motor, and the blades are located on a side facing the circuit module.

In one embodiment, the substrate is provided with a plurality of connecting ribs centered on the shaft portion and defining the airflow through hole.

In one embodiment, the abrasive member is an abrasive tape, and the abrasive tape is exposed to the main body in a direction perpendicular to an axial direction of the electric motor.

In one embodiment, the electric abrasive hand tool further includes a dust cover that is coupled to the main body and partially shields the abrasive member.

In one embodiment, the dust cover includes a cover body formed on the cover body to provide an opening through which the abrasive member is disposed.

In an embodiment, the cover body has an air inlet corresponding to the position of the second transmission portion, and the electric abrasive hand tool includes a second transmission portion that is coupled to the air inlet and is driven by the transmission shaft. And an auxiliary fan that introduces a cold airflow from the air inlet to discharge the running heat generated by the grinding member from the opening.

Through the above structure of the present invention, the following features are compared with the conventional ones:

1. The heat dissipating fan is disposed between the electric motor and the circuit module, and through the correspondingly disposed air outlet and the air inlet, so that the cooling fan synchronizes the electric motor to rotate, and the cold air pair is introduced. The electric motor and the circuit module perform heat dissipation.

2. The heat conducting component of the present invention is disposed corresponding to the heat dissipating fan, and can provide a cold airflow to dissipate heat when the fan blade rotates, and dissipate the running heat energy on the circuit module.

3. The present invention provides heat dissipation to the abrasive member provided on the second transmission portion by an auxiliary fan that is coupled to the transmission shaft, thereby reducing the running heat energy generated when the polishing member performs the grinding operation.

10‧‧‧Host body

11‧‧‧Ontology

111‧‧‧ accommodating space

112‧‧‧air outlet

113, 114‧‧‧ air inlet

12‧‧‧ grip

20‧‧‧Abrased components

21‧‧‧Electric motor

211‧‧‧ drive shaft

212‧‧‧First transmission

213‧‧‧Second transmission

214, 215‧ ‧ Palin

22‧‧‧Circuit Module

221‧‧‧Control unit

222‧‧‧Power supply unit

223‧‧‧thermal element

224‧‧‧Electronic components

23‧‧‧Abrased parts

30‧‧‧ cooling fan

31‧‧‧Substrate

32‧‧‧Axis joint

33‧‧‧ fan leaves

34‧‧‧Airflow through hole

35‧‧‧ Connecting ribs

40, 50, 80‧‧‧ Merry

60‧‧‧ dust cover

601‧‧‧ Cover

602‧‧‧ openings

603‧‧‧air inlet

70‧‧‧Auxiliary fan

FIG. 1 is a perspective view showing the appearance of an embodiment of the present invention.

Figure 2 is a cross-sectional view showing the structure of an embodiment of the present invention.

Figure 3 is a cross-sectional view showing a partial structure of an embodiment of the present invention.

4 is a schematic view of a heat dissipation fan according to an embodiment of the present invention.

Figure 5 is a cross-sectional view (A) of the line A-A of Figure 3 of the present invention.

Figure 6 is a cross-sectional view (II) of the line A-A of Figure 3 of the present invention.

Figure 7 is a cross-sectional view showing the structure of another embodiment of the present invention.

The detailed description and technical contents of the present invention will now be described with reference to the following drawings: Referring to FIG. 1 to FIG. 5, the electric abrasive hand tool for improving heat dissipation efficiency of the present invention comprises a main body 10 and a grinding assembly 20. The main body 10 is mechanically processed in a metal material or a plasticized material in an embodiment, and the appearance of the main body 10 can be further designed according to user needs or habits. More specifically, the main body 10 has a body 11 and a handle 12 extending from the body 11. The housing 11 is formed with an accommodating space 111, and the accommodating space 111 further extends from the grip 12 in. In another aspect, the abrasive assembly 20 of the present invention includes a An electric motor 21 located in the accommodating space 111, a circuit module 22 located in the same axial direction as the electric motor 21 and connected to external electric power to control the operation of the electric motor 21, and an external exposed body of the main body 10 The electric motor 21 drives the polishing material 23 that generates the polishing operation. Further, the circuit module 22 of the present invention includes a control unit 221 disposed on the body 11 and in the same axial direction as the electric motor 21, and a remote control unit 221 disposed on the grip 12 and connected to the control unit 221 A power supply unit 222 that obtains operating power for power conversion. Thereby, operation heat generated after the circuit module 22 is energized is prevented from being accumulated in the circuit module 22. In addition, the circuit module 22 has a heat conducting component 223 disposed on the heat dissipating fan 30. The heat conducting component 223 is further configured as a heat dissipating fin disposed on an electronic component included in the circuit module 22. Above the 224, the operating heat generated by energizing the electronic component 224 is derived, and the electronic component 224 is prevented from operating normally due to heat accumulation. The electronic component 224 is an electronic switch included in the circuit module 22, Such as gold oxide half field effect transistor.

The electric motor 21 of the present invention has a transmission shaft 211 for outputting power, and the drive shaft 211 is defined at one end of the circuit module 22 as a first transmission portion 212, and the transmission shaft 211 is opposite to the circuit. The other end of the module 22 is a second transmission portion 213. The second transmission portion 213 is exposed outside the body 11 of the main body 10 and is connected to the polishing member 23 to drive the electric motor 21 during operation. The abrasive member 23 produces a polishing action. Referring to FIG. 1 and FIG. 2, in an embodiment, the abrasive member 23 is an abrasive cloth belt, and the abrasive cloth belt extends in a direction perpendicular to the axial direction of the electric motor 21 to expose the main body 10. Moreover, when the polishing tool 23 of the present invention is driven by the electric motor 21 to perform a polishing operation, the user is required to perform a single point grinding operation on an object by the end of the polishing member 23 to penetrate the object, thereby being rigid and rigid. The object is dismantled. Furthermore, in an embodiment, the electric motor 21 is provided with a Palin 214 at least one of the first transmission portion 212 and the second transmission portion 213.

The heat dissipation fan 30 is disposed on the first transmission portion 212 between the circuit module 22 and the electric motor 21, and the heat dissipation fan 30 has a substrate 31, and the substrate 31 is connected to the substrate 31. The shaft connecting portion 32 of the first transmission portion 212 and a plurality of blades 33 and a gas flow through hole 34 which are located on the substrate 31 and are radially arranged by the shaft connecting portion 32. In addition, the arrangement of the heat dissipation fan 30 of the present invention is further adjusted according to the airflow design. In an embodiment, the substrate 31 of the heat dissipation fan 30 is located on the side of the heat dissipation fan 30 facing the circuit module 22, and the The blades 33 are located on the side facing the electric motor 21. Alternatively, the substrate 31 of the heat dissipation fan 30 is located on the side of the heat dissipation fan 30 facing the electric motor 21, and the blades 33 are located on the side facing the circuit module 22. Furthermore, the substrate 31 is provided with a plurality of connecting ribs 35 centered on the shaft connecting portion 32 and defining the airflow through hole 34. In addition, in the main body 11 of the main body 10, at least one air outlet 112 is defined in the position corresponding to the blade 33, and the main body 11 of the main body 10 corresponds to the circuit module 22 and the electric motor 21. At least one air inlet 113 is opened in one position.

Herein, the present invention first exemplifies an embodiment in which the air inlet 113 is provided to correspond to the electric motor 21. Referring to FIG. 5 and FIG. 6, the electric grinder tool obtains working power from the external power, and is subjected to a The control means triggers the circuit module 22 to drive the electric motor 21 to operate. When the electric motor 21 is in operation, the transmission shaft 211 of the electric motor 21 is synchronized by the first transmission portion 212 and the second transmission portion 213. The polishing member 23 and the heat dissipation fan 30. That is to say, the heat dissipation fan 30 of the present invention is coupled to the transmission shaft 211 to rotate correspondingly with the grinding member 23. When the blade 33 rotates, the cold airflow is introduced from the air inlet 113, and the running heat energy generated by the electric motor 21 and the circuit module 22 is discharged from the air outlet 112 through the airflow through hole 34, and the flow of the cold airflow is performed. The path is shown as reference numeral 40 in FIG. In addition, the airflow formed by the cooling fan 30 rotating in the accommodating space 111 further provides dispersion to the Palin 214 provided on the first transmission portion 212. Heat to dissipate the frictional waste heat generated by the Palin 214 due to the rotation of the drive shaft 211. In addition, in the foregoing embodiment, the circuit module 22 is disposed with the heat conducting component 223 facing the heat dissipating fan 30. At this time, the cold airflow formed by the rotating fan 30 further provides heat dissipation to the heat conducting component 223, specifically dissipating the The operating heat generated by the circuit module 22.

As shown in FIG. 7 , in an embodiment, the body 11 of the main body 10 has the air inlets 113 and 114 respectively corresponding to the positions of the circuit module 22 and the electric motor 21 . When the fan blade 33 rotates, two airflow paths are formed in the accommodating space 111, and a cold airflow enters the accommodating space 111 through the air inlet 113 corresponding to the electric motor 21, and then passes through the airflow through hole. The running heat energy generated by the electric motor 21 is discharged from the air outlet 112 as indicated by reference numeral 40 in FIG. The second cold air flow enters the accommodating space 111 via the air inlet 114 corresponding to the circuit module 22, and the running heat generated by the circuit module 22 is discharged from the air outlet 112, as shown in FIG. Show. Thereby, the external cold airflow is multi-pathed into the body 11 through the plurality of air inlets 113, 114, thereby providing better heat dissipation effect to the electric motor 21 and the circuit module 22.

Referring to FIG. 1 to FIG. 5 , the electric abrasive hand tool of the present invention further includes a dust cover 60 that is combined with the main body 10 and partially shields the polishing member 23 . Further, the dust cover 60 is further provided. The cover body 601 is formed on the cover body 601 to provide an opening 602 through which the grinding member 23 is disposed, thereby limiting the dust generated during the grinding process of the wear-resistant member 23, and cannot be scattered around. Furthermore, the cover body 601 defines an air inlet 603 corresponding to the position of the second transmission portion 213, and the electric grinding hand tool includes a second transmission portion 213 corresponding to the air inlet 603 and passes through the transmission shaft. The auxiliary fan 70 is operated by the air inlet 603 to introduce the cold airflow from the air inlet 603 to discharge the running heat generated by the polishing member 23 from the opening 602. Thereby, heat is provided to the polishing member 23 and another of the Palin 215 disposed on the second transmission portion 213, and the path of the cold air flow is As indicated by reference numeral 80 in Fig. 3, and further through the air flow, the dust generated during the grinding of the abrasive member 23 cannot be scattered around.

In summary, the present invention consists of a main body and a grinding assembly. The grinding assembly is mounted in the main body and includes an electric motor, a circuit module and an abrasive member, and a cooling fan co-operating with the electric motor is disposed between the circuit module and the electric motor, and the main body Having at least one air outlet at a position corresponding to the cooling fan, and at least one air inlet is disposed at a position corresponding to the circuit module and the electric motor, so that the electric motor is synchronously driven by the circuit module In the polishing device and the heat dissipating fan, the heat dissipating fan rotates to introduce a cold airflow from the air inlet and through the airflow through hole, the electric heat generated by the electric motor and the circuit module is discharged from the air outlet. This is to improve the heat accumulation problem derived from the use of pneumatic tools instead of electric tools.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the present application should remain within the scope of the patent of the present invention.

11‧‧‧Ontology

112‧‧‧air outlet

113‧‧‧air inlet

21‧‧‧Electric motor

211‧‧‧ drive shaft

212‧‧‧First transmission

213‧‧‧Second transmission

214, 215‧ ‧ Palin

221‧‧‧Control unit

223‧‧‧thermal element

224‧‧‧Electronic components

23‧‧‧Abrased parts

30‧‧‧ cooling fan

31‧‧‧Substrate

32‧‧‧Axis joint

60‧‧‧ dust cover

601‧‧‧ Cover

70‧‧‧Auxiliary fan

Claims (11)

An electric grinder tool for improving heat dissipation efficiency includes: a main body having a body and a grip extending from the body, the body forming an accommodating space; and an abrasive assembly including a accommodating space An electric motor that outputs power by a drive shaft, a circuit module that is in the same axial direction as the electric motor and is connected to external power to control operation of the electric motor, and defines that the drive shaft is located at one end of the circuit module. a transmission portion and a second transmission portion opposite to the circuit module, wherein the second transmission portion is connected with an abrasive member exposed to the outside of the main body and driven by the second transmission portion to generate a grinding action; A heat dissipating fan disposed on the first transmission portion is disposed between the circuit module and the electric motor, and the heat dissipating fan has a substrate, a shaft joint portion disposed on the substrate and connected to the first transmission portion, and a plurality of blades and a gas flow through hole that are radially arranged on the substrate, wherein the body of the main body has at least one air outlet corresponding to the blade position And the main body of the main body is provided with at least one air inlet at a position corresponding to the circuit module and the electric motor, so that the transmission shaft of the electric motor is driven by the circuit module to be synchronized with the first transmission portion And the second transmission portion drives the polishing member and the heat dissipation fan, and the blade rotates to introduce a cold airflow from the air inlet, the cold airflow does not enter the electric motor and flows along the surface of the electric motor, and passes through the airflow The hole discharges the electric heat generated by the electric motor and the circuit module from the air outlet, and the circuit module has a side of the cooling fan to dissipate the circuit module to generate operating heat energy through the cold air introduced through the fan blade. Thermally conductive element. The electric grinder hand tool for improving heat dissipation efficiency according to claim 1, wherein the main body of the main body has the air inlet respectively at a position corresponding to the circuit module and the electric motor. An electric grind hand tool for improving heat dissipation efficiency according to claim 1, wherein the circuit module includes a control unit disposed on the main body and in the same axial direction as the electric motor, and is disposed on the grip and connected to the handle The power supply unit that obtains the operating power from the external power and performs power conversion from the external control unit. The electric grind hand tool for improving heat dissipation efficiency according to claim 1, wherein the electric motor is provided with a Palin in at least one of the first transmission portion and the second transmission portion. The electric grinding hand tool for improving heat dissipation efficiency according to claim 1, wherein the substrate of the heat dissipating fan is located on a side of the heat dissipating fan facing the circuit module, and the blades are located on a side facing the electric motor. The electric grinder hand tool for improving heat dissipation efficiency according to claim 1, wherein the substrate of the heat dissipating fan is located on a side of the heat dissipating fan facing the electric motor, and the blades are located on a side facing the circuit module. The electric grinder hand tool for improving heat dissipation efficiency according to claim 1, 5 or 6, wherein the substrate is provided with a plurality of connecting ribs centered on the shaft portion and defining the air flow through hole. The electric grind hand tool for improving heat dissipation efficiency according to claim 1, wherein the abrasive member is an abrasive cloth belt, and the abrasive cloth belt is extended to expose the main body to a direction perpendicular to an axial direction of the electric motor. The electric grind hand tool for improving heat dissipation efficiency according to claim 8, wherein the electric grinder tool further comprises a dust cover that is combined with the main body and partially shields the abrasive member. An electric abrasive hand tool for improving heat dissipation efficiency according to claim 9, wherein the dust cover comprises a cover body, and an opening formed on the cover body to provide the abrasive member. An electric grinder hand tool for improving heat dissipation efficiency according to claim 10, wherein the cover body has an air inlet corresponding to the position of the second transmission portion, and the electric grinder tool includes a second transmission portion An auxiliary fan that discharges the running heat generated by the polishing member from the air inlet by the air inlet and is driven by the transmission shaft to be driven by the transmission shaft.