TW202342229A - Grinding tool machine including a housing, a drive assembly and a guide structure - Google Patents

Abstract

Disclosed is a grinding tool machine, including a housing, a drive assembly disposed within the housing and a flow guide structure. The housing is formed with at least one air inlet and at least one first air outlet. The drive assembly includes a motor and an airflow generation member in synchronous rotation with the motor. The motor has a motor enclosure. The airflow generation member is located at one end, which is not connected to a grinding member, of the motor. The motor enclosure has at least one first opening and at least one second opening communicated with an interior of the motor. The flow guide structure is disposed in one of the housing and the motor enclosure. The flow guide structure makes the grinding tool machine have a first airflow path, and the first airflow path sequentially consists of the air inlet, the first opening, the interior of the motor, the second opening, the airflow generation member and the first air outlet.

Description

Grinding tool machine

The present invention relates to a grinding machine tool, and in particular, to a grinding machine tool that allows cooling airflow to enter the interior of the motor and provide heat dissipation to the gripping portion of the casing.

Although most existing grinding machine tools are equipped with an air flow generating member linked to a motor, it is expected that the air flow generating member is used to dissipate the heat of the grinding machine tool during operation. As mentioned above, as disclosed in CN101636245B, the design of the grinding machine tool in this case is such that the air flow generating member is arranged between the motor and a grinding piece, so that the main purpose of the air flow generating member is not to dissipate heat, but to dissipate dust and dissipate heat. It is just an additional function. When the air flow generating member is activated, the opening provided at the handle can be used as an air inlet and generate air flow in the grinding tool casing. The air flow passes through the outside of the motor and finally faces the grinding part in the casing. part of the discharge. The air flow path designed in this way is too long, and the effect of reducing heat dissipation is limited. Furthermore, in order to improve the user's gripping experience, the overall design of today's grinding machine tools is designed with a good grip structure, which leads to more significant heat dissipation problems in the casing of the grinding machine. If the grinding tool machine adopts the configuration of the air flow generating parts mentioned above, the temperature inside the shell will rise significantly due to the heat generated during the operation of the motor. The temperature on the shell surface will also rise significantly with the temperature rise inside the shell, and the shell surface will heat up significantly. It will make the user's palm feel obvious, which is not conducive to the user experience.

In order to solve the aforementioned problem of difficulty in dissipating heat inside the grinding tool machine, US 7270598 discloses a technical solution for the grinding tool machine to introduce external air into the grinding tool machine for heat dissipation. In this case, the dust-containing gas generated by grinding is absorbed by the dust suction pipe, which causes the gas pressure inside the machine tool to change, so that external air can enter the inside of the machine tool through the air inlet and then enter the dust suction pipe. The external air flows in the direction of the dust suction pipe. The flow passes through the motor and dissipates heat from the motor. However, the structure disclosed in US 7270598 cannot be applied to a grinding tool machine implemented in a gripping manner because the air inlet is located at the top of the casing. If this design is adopted, the user will block the air inlet when gripping. The air inlet has poor air intake effect, and the heat dissipation effect of the motor is reduced.

In addition, although the applicant's patent TW I751912 in this case discloses technical solutions that can reduce the temperature inside the casing, the air inlet is the body of the casing, and the air flow outlet is at one head of the casing. The air flow generating member The problem is that it is located close to the air flow outlet. Such a setting will cause the air flow path to be too long, resulting in limited thermal effect. In addition, the case did not dissipate heat inside the motor, resulting in the problem of waste heat accumulation inside the motor being still obvious.

The main purpose of the present invention is to solve the problem that conventional hand-held grinding tools do not have the ability to dissipate heat inside the motor, resulting in significant temperature rise of the casing.

The secondary purpose of the present invention is to solve the problem that the heat dissipation air flow path of conventional hand-held grinding tool machines is too long, resulting in obvious temperature rise of the casing.

To achieve the above object, the present invention provides a grinding machine tool, which includes a casing, a driving component, and a flow guide structure. The casing provides a gripping operation, and the casing is formed with at least one air inlet and at least one first air outlet. The driving component is installed in the casing. The driving component includes a motor and an air flow generating member that rotates synchronously with the motor. The motor has a stator, a rotor, an output shaft connected to the rotor, and a ring of the stator. And the motor housing provided with the rotor, the output shaft has a first end facing the casing and assembled with the air flow generating member, and a second end coupled with a grinding member, the motor housing has at least one with the inlet The air port creates a first opening in a ventilation relationship, and at least one second opening that communicates with the inside of the motor and faces the air flow generating member. The air guide structure is provided on one of the casing and the motor housing. The air guide structure allows the grinding tool machine to have a first air flow path, and the first air flow path is the air inlet and the first opening in sequence. Inside the motor, the second opening, the air flow generating member and the first air outlet.

In one embodiment, the air guide structure is provided in the casing and between the first air outlet and the air inlet.

In one embodiment, the air guide structure is a baffle formed on the motor housing and in contact with the inner wall of the casing after the motor housing is assembled.

In one embodiment, the interior of the casing is divided into a motor space and a grinding space separated from the motor space, and the heat dissipation airflow path only acts on the motor space.

In one embodiment, the casing is divided into a head portion and a body portion that provide gripping. The casing is composed of at least two shell parts, and the motor housing is connected to one of the two shell parts.

In one embodiment, the motor housing has a protruding rib formed on the bottom edge of the motor housing in contact with the inner wall of the casing. The protruding rib distinguishes the motor space and the grinding space in the casing.

In one embodiment, the motor has an end plate mounted on an end of the motor housing where the second opening is not formed, and the end plate provides for the stator to be fixed thereon.

In one embodiment, the casing is divided into a head portion that provides a grip and a body portion. The casing has an operating pressure plate assembled on the body portion and at least one second air outlet. The grinding tool machine includes a A guide member in the casing and located at the junction of the head and the body allows the grinding tool machine to define a second air flow path, and the second air flow path is in sequence the air inlet, and the third air flow path is An opening, the inside of the motor, the second opening, the air flow generating member and the second air outlet.

In one embodiment, the air guide has a drainage portion facing the body, and the drainage portion includes a main guide surface and two auxiliary guide surfaces respectively connected to both sides of the main guide surface.

In one embodiment, the auxiliary guiding surface is composed of a complex curved surface.

In one embodiment, the flow guide is in an arc shape, and the flow guide has two stop blocks respectively provided at two ends of the flow guide.

In one embodiment, the horizontal height of the first air outlet on the casing is higher than the horizontal height of the air inlet on the casing.

In one embodiment, the casing has at least one dust filter located at the air inlet.

In one embodiment, the airflow generating member is a centrifugal fan.

Through the foregoing implementation of the present invention, compared with the conventional ones, it has the following characteristics: the present invention passes through the air guide structure, the air inlet and the first air outlet on the casing, and the first opening and the second opening on the motor cover. The opening allows the first airflow path to be generated inside the grinding tool machine, and the first airflow path flows through the inside of the motor, specifically solving the problem of severe temperature rise on the surface of the motor and the casing, and preventing the user from feeling an obvious temperature rise in the palm of the hand. . In addition, the first airflow path of the present invention is shorter than conventional ones, which can further increase the heat dissipation effect.

The detailed description and technical content of the present invention are described as follows with reference to the drawings:

Referring to FIGS. 1 to 6 , the present invention provides a grinding machine tool 20 . The grinding machine tool 20 includes a housing 21 , a driving component 22 , and a flow guide structure 24 . Among them, the casing 21 is provided for the user to operate in a grasping manner. The user grasps the casing 21 at a position just above the driving component 22. More specifically, the user's palm is located at the top of the driving component 22. relatively above. The casing 21 is formed with at least one air inlet 211 and a first air outlet 212, wherein the horizontal height of the first air outlet 212 on the casing 21 is higher than the horizontal height of the air inlet 211 on the casing 21 , means that the air inlet 211 will be closer to a working surface where the grinding tool 20 performs grinding operations. To prevent dust from entering through the air inlet 211, in one embodiment, the casing 21 has at least one dust filter element located at the air inlet 211. The dust filter element can be a filter mesh or filter cotton that does not excessively affect the flow of gas. . Furthermore, the first air outlet 212 is not located on the top of the casing 21 , that is to say, the user does not affect the exhaust of the first air outlet 212 when grasping.

In addition, the driving assembly 22 is installed in the casing 21 . The driving assembly 22 includes a motor 221 and an air flow generating member 222 that rotates synchronously with the motor 221 . The motor 221 has a stator 223, a rotor 224, a set of output shafts 225 connected to the rotor 224, and a motor housing 226 arranged around the stator 223 and the rotor 224. The output shaft 225 has a first end 227 and a second end 228 opposite to the first end 227. Taking the direction of the grinding tool machine 20 as shown in FIG. 6 as an example, the first end 227 is The top end of the output shaft 225 and the second end 228 are the bottom end of the output shaft 225 . The first end 227 faces the inside of the casing 21 and is assembled with the air flow generating member 222 , and the second end 228 is assembled with a grinding member 25 . It can be seen from the above that if the grinding member 25 is located below the motor 221 , the air flow generating member 222 will be located above the motor 221 . In addition, the height of the air flow generating member 222 in the casing 21 can be the same height as the first air outlet 212 , or close to the height of the first air outlet 212 . When the air flow generating member 222 operates, it will generate an air flow with an axial direction different from that of the output shaft 225. The air flow generating member 222 is a centrifugal fan, and the air flow generating member 222 faces the first air outlet 212. The air flow generating member 222 includes a plurality of The fan blades 236, and an annular plate 237 providing the fan blades 236 are arranged, the fan blades 236 will be arranged to form an impeller, and the air flow generating member 222 is from between any two adjacent ones of the fan blades 236. Out of the wind. Furthermore, the distance between any two adjacent fan blades 236 is not equidistant, but gradually expands from the inner edge of the ring plate 237 toward the outer edge of the ring plate 237 . When the motor 221 adopts an outer rotor design, the ring plate 237 can be a part of the rotor 224 . In addition, in one embodiment, the air flow generating member 222 includes a connecting ring 238 separated from the two ends of the fan blades 236 by the ring plate 237. The size of the connecting ring 238 is not limited to being equal to the ring plate 237. In addition, the motor housing 226 has at least one first opening 229 and at least one second opening 230. The first opening 229 is located on the side of the motor housing 226. The first opening 229 forms a ventilation relationship with the air inlet 211. Further, Alternatively, the first opening 229 may directly face the air inlet 211 . In addition, the second opening 230 communicates with the inside of the motor 221 and faces the air flow generating member 222 . Taking the direction of the grinding tool machine 20 as shown in FIGS. 2 to 6 as an example, the second opening 230 is located at the top of the motor housing 226 . Furthermore, in this embodiment, the motor 221 adopts an outer rotor design, and the rotor 224 is provided outside the stator 223. At least one through hole 234 is formed on the side of the rotor 224 facing the air flow generating member 222.

Based on the above, the air guide structure 24 of the present invention is disposed at one of the following locations: inside the casing 21 and the motor housing 226 . As shown in FIG. 5 , the air guide structure 24 is disposed on the motor housing 226 , and as shown in FIG. 8 , the air guide structure 24 is disposed in the casing 21 . This article will temporarily use the continuation shown in Figure 5 for explanation, but this is not a limitation. Please refer to Figures 5 and 6. The purpose of the air guide structure 24 of the present invention is to allow the airflow entering from the air inlet 211 to only pass through the first opening 229 and enter the interior of the motor 221. The flow guide structure 24 allows the grinding machine tool 20 to have a first airflow path 30, which is sequentially the air inlet 211, the first opening 229, the inside of the motor 221, the second opening 230, The air flow generating member 222 and the first air outlet 212 . Accordingly, when the air flow generating member 222 rotates, the air flow (marked 32 in FIG. 7 ) entering from the air inlet 211 will move along the first air flow path 30 and dissipate heat inside the motor 221 along the way, that is, the air flow ( 7) will dissipate heat from the plurality of coils 239 provided on the stator 223 or the rotor 224 in the motor 221, so as to significantly reduce the waste heat accumulated during the operation of the motor 221, so that the casing 21 can provide The part held by the user will not be significantly heated, and the user's palm will not feel uncomfortable during operation due to the obvious temperature rise of the casing 21 .

Please refer to Figure 5 again. When the air guide structure 24 is provided on the motor housing 226, the air guide structure 24 is a baffle 241 provided on the motor housing 226. The baffle 241 will contact the machine after assembly. The inner wall of the shell 21 blocks the direct communication between the air inlet 211 and the first air outlet 212 . In the embodiment disclosed in FIG. 5 , the baffle 241 is shaped to extend from the top edge of the motor housing 226 , but the invention is not limited to this. Please refer to FIG. 8 again. In another embodiment, when the air guide structure 24 is disposed in the casing 21, the air guide structure 24 will be between the first air outlet 212 and the air inlet 211. Further, Therefore, the air guide structure 24 does not have to be integrally formed by the casing 21, but can be an independent component provided in the casing 21, such as a soft air blocking member 242, etc., which can adapt to the space inside the casing 21 and generate resistance. Qi effector. Furthermore, the casing 21 may also be provided with structures for assembling and positioning the air guide structure 24 , such as bumps, tenons, etc.

Referring back to FIGS. 5 and 6 , the interior of the casing 21 is divided into a motor space 213 and a grinding space 214 separated from the motor space 213 . The first airflow path 30 only acts in the motor space 213 . More specifically, the motor housing 226 has a protruding rib 231 formed on the bottom edge of the motor housing 226 and in contact with the inner wall of the casing 21. Through the separation of the protruding rib 231, the casing 21 can distinguish the motor. space 213 and the grinding space 214. In one embodiment, the motor 221 has an end plate 232 installed on one end of the motor housing 226 where the second opening 230 is not formed. The end plate 232 not only provides the stator 223 to be fixed thereon, but also closes the motor housing. The originally open end of 226 allows the airflow entering from the first opening 229 to only flow toward the second opening 230 . In one embodiment, the motor 221 has an airtight support ring 233 that can be assembled with the motor housing 226 to support the end plate 232. The airtight support ring 233 and the end plate 232 can cooperate with the rib 231, The motor space 213 and the grinding space 214 are distinguished inside the casing 21, and it should be understood that the motor space 213 and the grinding space 214 are not connected to each other in the present invention.

Referring back to FIGS. 4 to 6 , the casing 21 can be divided into a head portion 215 for gripping and a body portion 216 based on the appearance. The casing 21 further has an operating pressure plate 217 assembled on the body 216, and at least one second air outlet 218. On the other hand, the grinding machine tool 20 includes a circuit board 26 and a flow guide 27. The circuit board 26 and the flow guide 27 are both located in the casing 21. The circuit board 26 is located on the body 216. , and is electrically connected to the motor 221 to control the operation of the motor 221. The air guide 27 is disposed at the junction of the head 215 and the body 216. The air guide 27 will define a second air flow path 31 in the grinding tool 20. The second air flow path 31 is in sequence: The air inlet 211 , the first opening 229 , the inside of the motor 221 , the second opening 230 , the air flow generating member 222 and the second air outlet 218 . As can be seen from the above, the second airflow path 31 starts from the same air inlet 211 and also passes through the first opening 229, the inside of the motor 221, and the airflow generating member 222, and provides a gripping portion of the casing 21 To dissipate heat, the second airflow path 31 then enters the body 216 , allowing the circuit board 26 located in the body 216 to dissipate heat, and is finally discharged from the second air outlet 218 . Please refer to Figure 9 again. In addition to the above, in one embodiment, the air guide 27 has a guide portion 271, which guides the airflow moving along the second airflow path 31 down when passing through it. Move toward the second air outlet 218 . The drainage portion 271 includes a main guide surface 272 and two auxiliary guide surfaces 273 respectively connected to both sides of the main guide surface 272 . Furthermore, the auxiliary guide surface 273 is composed of a complex curved surface.

Please refer to FIG. 3 and FIG. 9 again. In one embodiment, the flow guide 27 is disposed close to the edge of the motor housing 226 and may be in an arc shape. It should be noted that the flow guide 27 does not cover the first opening 229 . In addition, the flow guide 27 has two flow stop blocks 274 respectively provided at two ends of the flow guide 27. The flow stop blocks 274 cooperate with the flow guide structure 24 to limit the airflow entering from the air inlet 211. Enter the first opening 229. Referring again to FIGS. 6 and 9 , in one embodiment, the air guide 27 is further formed with a wire passing gap 275 , which allows a wire 235 of the motor 221 to pass through and connect to the circuit board 26 .

Please refer to FIG. 2 . In one embodiment, the casing 21 is composed of at least two shell parts 219 , and the motor housing 226 is connected to one of the two shell parts 219 . Furthermore, the motor housing 226 can be integrally formed with one of the two housings 219

In summary, the above is only a preferred embodiment of the present invention, and it should not be used to limit the scope of the present invention. That is, all equivalent changes and modifications made based on the patent scope of the present invention should still fall within the scope of the patent of the present invention.

20: Grinding tool machine 21:Chassis 211:Air inlet 212:First air outlet 213:Motor space 214:Grinding space 215:Head 216:Body 217: Operating pressure plate 218: Second air outlet 219: Shell 22:Drive components 221: Motor 222:Wind flow generating parts 223:Stator 224:Rotor 225:Output shaft 226:Motor cover 227:First end 228:Second end 229:First opening 230:Second opening 231:Protruding ribs 232:End plate 233: Airtight support ring 234:Through hole 235:Wire 236:Fan blade 237: Ring plate 238:Connecting ring 239:Coil 24: Diversion structure 241:Baffle 242:Soft gas barrier parts 25:Abrasive parts 26:Circuit board 27: guide parts 271:Drainage Department 272: Main guide surface 273: Auxiliary guide surface 274: Stop block 275: Passing gap 30: First airflow path 31: Second airflow path 32:Airflow

Figure 1 is a schematic structural diagram of an embodiment of a grinding machine tool according to the present invention. Figure 2 is a schematic partial structural diagram of an embodiment of a grinding machine tool according to the present invention. Figure 3 is an exploded schematic diagram of the structure of an embodiment of a grinding machine tool according to the present invention. Figure 4 is a schematic structural cross-sectional view of an embodiment of a grinding machine tool according to the present invention. Figure 5 is a schematic partial structural cross-sectional view (1) of an embodiment of the grinding machine tool of the present invention. Figure 6 is a partial structural cross-sectional view (2) of an embodiment of the grinding machine tool of the present invention. Figure 7 is a schematic diagram of a partial air flow path of a grinding machine tool according to an embodiment of the present invention. Figure 8 is a schematic cross-sectional view of the partial structure of another embodiment of the grinding machine tool of the present invention. Figure 9 is a schematic top view of the flow guide member of the grinding machine tool according to one embodiment of the present invention.

211:Air inlet

212:First air outlet

213:Motor space

214:Grinding space

215:Head

217: Operating pressure plate

218: Second air outlet

22:Drive components

221: Motor

222:Wind flow generating parts

223:Stator

224:Rotor

226:Motor cover

229:First opening

230:Second opening

231:Protruding ribs

233: Airtight support ring

24: Diversion structure

241:Baffle

25:Abrasive parts

26:Circuit board

27: guide parts

271:Drainage Department

272: Main guide surface

273: Auxiliary guide surface

274: Stop block

30: First airflow path

31: Second airflow path

Claims (18)

A grinding machine tool containing: A casing is provided for operation in a gripping manner and is formed with at least one air inlet and at least one air outlet; A driving component is installed in the casing and includes a motor and an air flow generating member that rotates synchronously with the motor. The motor has a stator, a rotor, an output shaft connected to the rotor, and a ring of the stator and the The motor housing is provided with a rotor. The output shaft has a first end facing the casing and assembled with the air flow generating member, and a second end away from the casing and assembled with a grinding member. The motor housing has at least one A first opening that has a ventilation relationship with the air inlet, and at least one second opening that communicates with the inside of the motor and faces the air flow generating member; and A flow guide structure is provided at one of the casing and the motor housing. The flow guide structure allows the grinding tool machine to have a first air flow path, and the first air flow path is sequentially the air inlet and the first opening. , inside the motor, the second opening, the air flow generating member and the first air outlet. The grinding tool machine of claim 1, wherein the flow guide structure is provided in the casing and between the first air outlet and the air inlet. The grinding tool machine of claim 1, wherein the flow guide structure is a baffle formed on the motor housing and in contact with the inner wall of the casing after the motor housing is assembled. The grinding tool machine according to any one of claims 1 to 3, wherein the interior of the casing is divided into a motor space and a grinding space separated from the motor space, and the heat dissipation airflow path only acts on the motor space. The grinding tool machine according to claim 4, wherein the casing is divided into a head portion and a body portion that provide a grip, the casing is composed of at least two shell parts, and the motor housing is connected to one of the two shell parts. . The grinding tool machine according to claim 4, wherein the motor housing has a convex rib formed on the bottom edge of the motor casing and in contact with the inner wall of the casing. The convex rib distinguishes the motor space and the casing inside the casing. Grinding space. The grinding tool machine of claim 6, wherein the motor has an end plate mounted on an end of the motor housing that does not form the second opening, and the end plate provides for the stator to be fixed thereon. The grinding tool machine according to claim 4, wherein the casing is divided into a head part for providing grip and a body part, the casing has an operating pressure plate assembled on the body part, and at least one second air outlet, the The grinding tool machine includes a guide member located in the casing and located at the interface between the head and the body. The guide member allows the grinding tool machine to define a second airflow path, and the second airflow path is sequentially The air inlet, the first opening, the inside of the motor, the second opening, the air flow generating member and the second air outlet. The grinding machine tool according to claim 8, wherein the flow guide has a drainage portion facing the body, and the drainage portion includes a main guide surface and two auxiliary guide surfaces respectively connected to both sides of the main guide surface. The grinding tool machine according to claim 9, wherein the auxiliary guide surface is composed of a complex curved surface. The grinding tool machine according to claim 9, wherein the flow guide is in an arc shape, and the flow guide has two stop blocks respectively provided at two ends of the flow guide. The grinding tool machine according to claim 8, wherein the casing is divided into a head portion and a body portion that provide a grip, the casing is composed of at least two shell parts, and the motor housing is connected to one of the two shell parts. . The grinding tool machine according to claim 8, wherein the horizontal height of the first air outlet on the casing is higher than the horizontal height of the air inlet on the casing. The grinding tool machine according to claim 13, wherein the casing has at least one dust filter element located at the air inlet. The grinding tool machine according to any one of claims 1 to 3, wherein the casing is divided into a head part and a body part that provide a grip, the casing is composed of at least two shell parts, the motor housing and the two shell parts One of the connections. The grinding tool machine according to any one of claims 1 to 3, wherein the horizontal height of the first air outlet on the casing is higher than the horizontal height of the air inlet on the casing. The grinding tool machine according to any one of claims 1 to 3, wherein the casing has at least one dust filter provided at the air inlet. The grinding tool machine according to any one of claims 1 to 3, wherein the air flow generating member is a centrifugal fan.

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