CN217883126U

CN217883126U - Electric tool and motor and air guide sleeve applied to same

Info

Publication number: CN217883126U
Application number: CN202222247710.7U
Authority: CN
Inventors: 王添辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2022-11-22
Anticipated expiration: 2032-08-25

Abstract

The utility model relates to an electric tool and motor, kuppe of using thereof, electric tool include shell body, work portion, motor, and the motor assembles in the shell body, and work portion assembles in the shell body and by motor drive setting. The motor comprises a stator, a rotor, a heat dissipation fan and a flow guide cover, wherein the rotor can be assembled in the stator in a fixed-shaft rotating mode, and the heat dissipation fan is assembled in the rotor and driven to rotate by the rotor. The air guide sleeve is arranged in an annular structure. The air guide sleeve is sequentially provided with a rotor through hole, an inner sealing area, an air guide area and an outer sealing area from the middle part to the circumferential side edge of the air guide sleeve, the rotor through hole is a middle through hole of an annular structure of the air guide sleeve, and the inner sealing area, the air guide area and the outer sealing area are sequentially sleeved outside the rotor through hole. The diversion area is provided with a plurality of diversion holes which penetrate through the diversion cover. The utility model discloses a motor forms a semi-enclosed structure and is difficult for getting into dust and impurity, promotes the life of motor.

Description

Electric tool and motor and air guide sleeve applied to same

Technical Field

The utility model relates to a motor drive's electric tool field, concretely relates to electric tool and motor, kuppe of using thereof.

Background

Electric tools, such as angle grinders, cutting machines, angle grinders, straight hand drills, etc., operate with a motor driving a working portion of a structure such as a drill bit, a grinding disc, a cutting disc, etc. Most electric tools rely on a heat dissipation fan driven by a motor rotor to dissipate heat of a structure in an outer shell of the electric tool.

A common heat dissipation structure of an electric tool, as disclosed in fig. 4 of the specification of chinese patent publication No. CN101254588B, is a common heat dissipation structure for a brushed series motor, which dissipates heat by means of an impeller structure to cool a motor and other structures. The winding of the brush series excited motor rotor has a small heating value, the through type air cooling structure has a good heat dissipation effect, but the air flow driven by the heat dissipation fan can bring impurities in the working environment to pass through the interior of the motor (namely a cavity between the stator and the rotor), and the impurities can lose the insulating layer of the winding and enter the bearing to cause the damage of the motor.

And like the scheme disclosed by the utility model patents in china such as publication numbers CN215990486U, CN204597752U, etc., it protects the closed motor structure through motor casing, and then avoids the problem that the above-mentioned motor is easy to damage, but this structure has closed the motor, and the motor casing has been separated to the driven air current of heat dissipation fan and motor, and is poor to the motor radiating effect. Moreover, many electric tool all are all toward the miniaturized development of fuselage, have increased motor casing structure and have obviously increased and have taken up the inside space of electric tool shell body, must increase electric tool's external diameter under the equivalent condition, are unfavorable for electric tool's development.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electric tool and motor, kuppe of using thereof to solve above-mentioned problem.

The utility model adopts the following technical scheme:

a flow guide cover is arranged in an annular structure. The air guide sleeve is sequentially provided with a rotor through hole, an inner sealing area, an air guide area and an outer sealing area from the middle part to the circumferential side edge of the air guide sleeve, the rotor through hole is a middle through hole of an annular structure of the air guide sleeve, and the inner sealing area, the air guide area and the outer sealing area are sequentially sleeved outside the rotor through hole. The rotor through hole is used for accommodating a rotor of a motor of the electric tool, the outer closed area is used for being connected with the inner wall of an outer shell of the electric tool, and the inner closed area is used for being connected with the end part of a stator of the motor of the electric tool. The diversion area is provided with a plurality of diversion holes which penetrate through the diversion cover.

A motor comprises a stator, a rotor, a heat dissipation fan and the air guide sleeve, wherein the rotor can be assembled in the stator in a fixed-shaft rotating mode, and the heat dissipation fan is assembled in the rotor and driven to rotate by the rotor. The rotor penetrates through the air guide sleeve through the rotor through hole, and the heat dissipation fan and the stator are respectively positioned on two sides of the air guide sleeve.

Further:

the heat dissipation fan is arranged in a semi-open type impeller structure. This heat dissipation fan includes rim plate and several blade, and the blade equipartition is in the rim plate side. The height of the part of the blade in the middle of the wheel disc is smaller than that of the part of the blade adjacent to the outer peripheral edge of the wheel disc, and the height of the blade is the distance of the blade extending upwards from the side surface of the wheel disc along the axial direction of the fixed shaft of the heat dissipation fan.

An electric tool comprises an outer shell, a working part and the motor, wherein the motor is assembled in the outer shell, and the working part is assembled in the outer shell and driven by the motor to be arranged. And a stator heat dissipation cavity is formed between the outer peripheral edge of the stator and the inner wall of the outer shell. The heat dissipation fan rotates to drive airflow to enter the position of the heat dissipation fan from the stator heat dissipation cavity through the flow guide hole or drive airflow to enter the stator heat dissipation cavity from the position of the heat dissipation fan through the flow guide hole.

Further:

the outer sealing area is adjacent to the inner wall of the outer shell. The inner closed area is adjacent to one side end of the stator facing the position of the heat dissipation fan.

The motor further comprises a flow guide cover, and the flow guide cover are respectively arranged at two ends of the stator. Above-mentioned drainage cover includes the drainage cover body and connects the arris, and the drainage cover body is sheet structure, and the drainage cover body cover is located the stator and deviates from outside the one end tip of above-mentioned heat dissipation fan position, forms annular drainage groove between the drainage cover body and the above-mentioned shell body, connects the arris and is located drainage inslot and both ends and connect the drainage cover body and shell body inner wall respectively. The drainage groove is communicated with the stator heat dissipation cavity.

The working part and the heat dissipation fan are in transmission connection with the head end of the rotor, and the tail end of the rotor can be rotatably assembled on the drainage cover body through a bearing in a fixed-shaft mode.

The shell body is provided with an air inlet and an air outlet, the air inlet is arranged at one end of the shell body, which deviates from the position of the working part, and the air outlet is arranged at one end of the shell body, which is adjacent to the position of the working part. The heat dissipation fan drives air flow to enter the outer shell from the air inlet and then sequentially pass through the drainage groove, the stator heat dissipation cavity and the flow guide hole and then be discharged from the exhaust hole.

The shell body comprises a head end shell, a middle shell and a tail end shell which are connected in sequence, the working portion is assembled on the head end shell, the stator is located in the middle shell, and a power output end of the rotor extends to the head end shell and is in transmission connection with the working portion. The air guide sleeve and the air guide sleeve are respectively arranged at the joint of the middle shell and the head end shell as well as the tail end shell. The air inlet is arranged on the tail end shell. The exhaust hole is arranged on the head end shell.

The periphery of the stator is provided with a plurality of heat dissipation teeth, and the heat dissipation teeth extend into the stator heat dissipation cavity from the periphery of the stator.

As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages:

the utility model discloses rely on the setting of kuppe, particularly, rely on to increase the kuppe between motor heat dissipation fan and stator, rely on inner closed area and motor stator end connection, the electron rotor is covered by inner closed area to motor stator's region outward promptly, and through outer closed area and motor housing body internal connection, and then the water conservancy diversion hole that fan driven air current guide that will dispel the heat was distinguished by the water conservancy diversion, stator heat dissipation chamber between stator and the shell body is passed through to this air current promptly, the winding in the motor has been avoided, cooling air concentrates on the stator, specifically be outside the stator core, the maximize promotes cooling air flow's utilization ratio.

The utility model discloses an above-mentioned cooling air current does not pass through the inside of motor, makes the motor form a semi-enclosed structure and be difficult for getting into dust and impurity, inside very big degree has been avoided the cooling air current can take the impurity among the operational environment to pass through the motor promptly, just also very big degree has avoided the insulating layer of this impurity loss winding, get into the bearing scheduling problem in the motor, the insulating layer loss of motor winding obviously reduces and the bearing in its structure is also difficult because of the dust damage, promote the life of motor.

Drawings

Fig. 1 is a schematic structural view of the electric tool of the present invention.

Fig. 2 is an exploded schematic view of the electric power tool of the present invention.

Fig. 3 is a schematic structural view of the air guide sleeve of the present invention.

Fig. 4 is a schematic structural view of the drainage cover and the middle housing of the present invention.

Fig. 5 is a schematic structural view of the heat dissipation fan of the present invention.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

Referring to fig. 1 and 2, an electric tool includes an outer housing 1, a motor and a working portion 3, the motor is assembled in the outer housing 1, and the working portion 3 is assembled in the outer housing 1 and driven by the motor. Generally, the electric tool can be various specific electric tools related to the background technology, the specific embodiment is illustrated by adopting a small-sized angle grinder structure, and the electric tool with other structures can be set according to the structure. Wherein the grinding sheets required for the operation of the working part 3 are omitted in the figure. Just the utility model discloses the motor can adopt if there is brush series excitation motor, common motor structure such as brushless motor to increase as the basis the utility model discloses a kuppe 24 structure. Specifically, this embodiment motor adopts the brushless motor structure to carry out the concrete description, the brushless motor structure with the utility model discloses a semi-closed heat radiation structure collocation result of use is more outstanding.

With continued reference to fig. 1 and 2, the motor includes a stator 21, a rotor 22, a heat dissipation fan 23, a wind guide sleeve 24, a wind guide sleeve, and a driver, wherein the rotor 22 is rotatably assembled in the stator 21 with a fixed shaft, and the heat dissipation fan 23 is assembled in the rotor 22 and is driven by the rotor 22 to rotate. The heat radiation fan 23 is used for driving the air flow in the outer housing 1 to form a cooling air flow for cooling the components of the electric tool which need to be cooled. The motor is a brushless motor, and thus the driver is a structure of a driving circuit board, a capacitor 261, and the like commonly used for the brushless motor. Accordingly, the actuator is provided with a heat sink 262 of aluminum alloy. The flow guide cover and the flow guide cover 24 are respectively arranged at two ends of the stator 21, and the flow guide cover 24 are respectively used for sealing two ends of the stator 21, namely, the motor forms a semi-closed structure to prevent cooling air flow from entering the motor. The air guide sleeve 24 is disposed at one end of the stator 21 adjacent to the position of the heat dissipation fan 23, and the air guide sleeve is disposed at one end of the stator 21 away from the position of the heat dissipation fan 23. In practical application, the cooling airflow can be guided by the arrangement of the air guide sleeve 24, but the cooling airflow can be further guided by the arrangement of the air guide sleeve, so that the possibility that the cooling airflow mistakenly enters the motor is reduced.

Referring to fig. 2 and 3, the air guide sleeve 24 is disposed in a ring structure. The air guide sleeve 24 is sequentially provided with a rotor through hole 241, an inner closed area 242, an air guide area 243, an outer closed area 244 and a connecting area 245 from the middle to the circumferential side edge of the air guide sleeve 24, the rotor through hole 241 is a middle through hole of an annular structure of the air guide sleeve 24, the inner closed area 242, the air guide area 243 and the outer closed area 244 are annular structures which are sequentially sleeved outside the rotor through hole 241, and the connecting area 245 is a plurality of sheet structures which are arranged at intervals. The rotor through hole 241 is used for receiving the rotor 22 of the motor of the electric tool, the outer sealing area 244 is used for connecting with the inner wall of the outer shell 1 of the electric tool, and the inner sealing area 242 is used for connecting with the end of the stator 21 of the motor of the electric tool. The flow guiding area 243 is provided with a plurality of flow guiding holes 2431, and the flow guiding holes 2431 penetrate through the flow guiding cover 24. Specifically, the rotor 22 passes through the nacelle 24 through the rotor through hole 241, and the heat dissipation fan 23 and the stator 21 are respectively located on both sides of the nacelle 24. A stator heat dissipation chamber 10 is formed between the outer circumference of the stator 21 and the inner wall of the outer housing 1. The heat dissipation fan 23 rotates to drive the airflow to enter the position of the heat dissipation fan 23 from the stator heat dissipation cavity 10 through the diversion hole 2431 or drive the airflow to enter the stator heat dissipation cavity 10 from the position of the heat dissipation fan 23 through the diversion hole 2431.

Referring to fig. 1 and 2, the outer casing 1 is provided with an air inlet 101 and an air outlet 102, the air inlet 101 is used for cooling air to enter the outer casing 1, and the air outlet 102 is used for cooling air to flow out from the outer casing 1. In an electric tool such as an angle grinder, since there are many impurities in the position of the working portion 3, the air inlet 101 is generally opened at one end of the outer housing 1 away from the position of the working portion 3, and the air outlet 102 is opened at one end of the outer housing 1 adjacent to the position of the working portion 3. As shown in the solutions related to the background art, the heat dissipation fan 23 may be disposed adjacent to the position of the working portion 3, or may be disposed adjacent to an end of the stator 21 away from the position of the working portion 3, where the difference between the two is that the flow direction of the cooling airflow driven by the rotation of the heat dissipation fan 23 is adjusted. When the heat dissipating fan 23 is disposed adjacent to an end of the stator 21 away from the working portion 3, since the exhaust hole 102 is adjacent to the working portion 3, the cooling air flows to the guiding cover 24 and flows out from the guiding hole 2431 by being driven by the heat dissipating fan 23, that is, the heat dissipating fan 23 rotates to drive the air flow to enter the stator heat dissipating cavity 10 from the position of the heat dissipating fan 23 through the guiding hole 2431. In this case, the guide effect of the setting of the draft hood on the cooling air flow is small, and a person skilled in the art can select whether to set the draft hood according to needs. The present embodiment is further described by disposing the heat dissipating fan 23 adjacent to the working portion 3, and the structure is that the heat dissipating fan 23 rotates to drive the airflow from the stator heat dissipating chamber 10 to the heat dissipating fan 23 through the flow guiding hole 2431.

Referring to fig. 2 and 5, the heat dissipation fan 23 may be a common fan blade structure, a closed impeller structure, or the like, and the heat dissipation fan 23 is configured as a semi-open impeller structure in the present embodiment. The heat dissipation fan 23 includes a wheel disc 231 and a plurality of blades 232, wherein the blades 232 are uniformly distributed on the side surface of the wheel disc 231. The height of the blade 232 at the middle of the disk 231 is less than the height of the blade 232 adjacent to the outer peripheral edge of the disk 231, and the height of the blade 232 is the distance that the blade 232 extends from the side of the disk 231 in the axial direction of the fixed axis rotation of the heat dissipating fan 23. The structure of the blade 232 helps to reduce the energy consumption required by the rotation of the heat dissipation fan 23 and to make the driving of the cooling airflow caused by the rotation of the heat dissipation fan 23 correspond to the position of the flow guiding area 243, i.e. the efficiency of the heat dissipation fan 23 rotating at the position to centrifugally throw out air is enhanced, and the suction force of the heat dissipation fan 23 to the air at the position corresponding to the flow guiding area 243 is enhanced.

Referring to fig. 1, 2 and 4, the outer housing 1 includes a head end housing 11, a middle housing 12 and a tail end housing 13 connected in sequence, the working portion 3 is assembled to the head end housing 11, the stator 21 is located in the middle housing 12, and a power output end of the rotor 22 extends to the head end housing 11 and is in transmission connection with the working portion 3. The tail housing 13 is formed by two parts which are fastened together, and the driver is mounted in the tail housing 13. The air guide sleeve 24 and the air guide sleeve are respectively provided at the joint of the middle housing 12, the head housing 11, and the tail housing 13. The air inlet 101 is opened in the rear housing 13. The exhaust hole 102 is opened in the head end housing 11. Above-mentioned drainage cover includes the drainage cover body 251 and connects arris 252, and the drainage cover body 251 is the sheet structure, and the drainage cover body 251 cover is established outside the one end tip that stator 21 deviates from above-mentioned heat dissipation fan 23 position, forms annular drainage groove 250 between the drainage cover body 251 and the above-mentioned shell body 1, connects arris 252 and is located drainage groove 250 and both ends and connect the drainage cover body 251 and shell body 1 inner wall respectively. The flow guide grooves 250 communicate with the stator heat dissipation chamber 10. In fig. 2, the middle housing 12 and the drainage cover are illustrated in a half-section. In the above structure, the cooling air flow enters the tail housing 13, passes through the radiator 262, then enters the stator heat dissipation cavity 10 through the flow guide slots 250, passes through the flow guide holes 2431, and is exhausted through the exhaust holes 102. In order to enhance the heat dissipation, a plurality of heat dissipation teeth are distributed on the outer periphery of the stator 21, the heat dissipation teeth extend from the outer periphery of the stator 21 into the stator heat dissipation cavity 10, and the heat dissipation teeth are integrally formed with the iron core of the stator 21. The head end of the rotor 22 is connected with the working part 3, the working part 3 and the heat dissipation fan 23 are in transmission connection with the head end of the rotor 22, and the tail end of the rotor 22 is rotatably assembled on the drainage cover body 251 through a bearing in a fixed-shaft manner.

Referring to fig. 2 and 3, the intermediate housing 12 has a substantially tubular structure, and an end of the intermediate housing 12 adjacent to the head end housing 11 has a larger caliber than a main body thereof, and the main body of the intermediate housing 12 is used for accommodating the stator 21. The stator 21 has a bobbin structure attached to each of two ends of the core, and the air guide sleeve 24 and the flow guide sleeve are respectively sleeved outside the bobbin structure. The middle shell 12 is in a table-shaped structure with gradually reduced pipe diameter from the larger pipe diameter end to the joint of the main body part. The connecting region 245 is adjacent to the inner wall of the larger pipe diameter end of the middle housing 12, and the spacing of the sheet structure of the connecting region 245 is used for the cooling air flow to the position of the head end housing 11. The outer seal 244 abuts the inner wall of the intermediate housing 12 at the stepped down diameter plateau to prevent air flow from passing between the adjacent surfaces of the pod 24 and the intermediate housing 12. The outer periphery of the rotor 22 is disposed along the hole wall adjacent to the rotor through hole 241, and the end of the stator 21 on the side facing the position of the heat dissipation fan 23 is abutted with the inner closed region 242. To further enhance the sealing effect, the inner sealing area 242 is further provided with a wind-blocking ring 2421 sleeved on the end of the stator 21. Although there is no seal between the rotor 22 and the wall of the rotor bore 241, there is relatively less air flow therethrough than the flow of the flow guide holes 2431. Moreover, the above-mentioned heat dissipation fan 23 and the structure of the flow guiding cover are matched, so that the air can be further prevented from passing through the rotor through hole 241. The stator 21 is provided with a wire guide cover 211 on the winding frame at one end adjacent to the drainage cover, the wire guide cover 211 penetrates through the drainage cover body 251, and the wire guide cover 211 is used for a connecting wire between the motor and the driver to pass through.

The above-mentioned be the utility model discloses a concrete implementation way, nevertheless the utility model discloses a design concept is not limited to this, and the ordinary use of this design is right the utility model discloses carry out immaterial change, all should belong to the act of infringement the protection scope of the utility model.

Claims

1. An air guide sleeve, characterized in that: the air guide sleeve is arranged in an annular structure; the air guide sleeve is sequentially provided with a rotor through hole, an inner sealing area, an air guide area and an outer sealing area from the middle part to the circumferential side edge of the air guide sleeve, the rotor through hole is a middle through hole of an annular structure of the air guide sleeve, and the inner sealing area, the air guide area and the outer sealing area are annular structures which are sequentially sleeved outside the rotor through hole; the rotor through hole is used for accommodating a rotor of a motor of the electric tool, the outer closed area is used for being connected with the inner wall of an outer shell of the electric tool, and the inner closed area is used for being connected with the end part of a stator of the motor of the electric tool; the diversion area is provided with a plurality of diversion holes which penetrate through the diversion cover.

2. A motor comprises a stator, a rotor and a heat dissipation fan, wherein the rotor can be assembled in the stator in a fixed-shaft rotating mode, and the heat dissipation fan is assembled in the rotor and driven to rotate by the rotor; the method is characterized in that: further comprising the pod of claim 1; the rotor is through the rotor through-hole runs through the air guide sleeve, and the heat dissipation fan and the stator are respectively located on two sides of the air guide sleeve.

3. An electrical machine according to claim 2, wherein: the heat dissipation fan is arranged in a semi-open type impeller structure; the heat dissipation fan comprises a wheel disc and a plurality of blades, wherein the blades are uniformly distributed on the side surface of the wheel disc; the height of the part of the blade, which is positioned in the middle of the wheel disc, is less than that of the part of the blade, which is adjacent to the outer peripheral edge of the wheel disc, and the height of the blade is the distance of the blade, which extends upwards from the side surface of the wheel disc along the axial direction of the fixed shaft of the heat dissipation fan.

4. An electric tool comprises an outer shell, a working part and a motor, wherein the motor is assembled in the outer shell, and the working part is assembled in the outer shell and driven by the motor; the method is characterized in that: the electric machine is the electric machine of claim 2 or 3; a stator heat dissipation cavity is formed between the outer peripheral edge of the stator and the inner wall of the outer shell; the heat dissipation fan rotates to drive airflow to enter the position of the heat dissipation fan from the stator heat dissipation cavity through the diversion hole or drive airflow to enter the stator heat dissipation cavity from the position of the heat dissipation fan through the diversion hole.

5. An electric tool according to claim 4, wherein: the outer closed area is adjacent to the inner wall of the outer shell; the inner closed area is adjacent to the end part of one side of the stator facing the position of the heat dissipation fan.

6. An electric tool according to claim 4, wherein: the motor also comprises a flow guide cover, and the flow guide cover are respectively arranged at two ends of the stator; the drainage cover comprises a drainage cover body and a connecting edge, the drainage cover body is of a sheet structure, the drainage cover body covers the end part of one end of the stator, which is far away from the position of the heat dissipation fan, an annular drainage groove is formed between the drainage cover body and the outer shell, the connecting edge is positioned in the drainage groove, and the two ends of the connecting edge are respectively connected with the drainage cover body and the inner wall of the outer shell; the drainage groove is communicated with the stator heat dissipation cavity.

7. An electric tool according to claim 6, wherein: the working part the heat dissipation fan is in transmission connection with the head end of the rotor, and the tail end of the rotor is rotatably assembled on the drainage cover body through a bearing in a fixed-shaft mode.

8. An electric tool according to claim 6, wherein: the outer shell is provided with an air inlet hole and an air outlet hole, the air inlet hole is formed in one end, away from the position where the working part is located, of the outer shell, and the air outlet hole is formed in one end, close to the position where the working part is located, of the outer shell; the heat dissipation fan drives the air current by the inlet port passes through in proper order after getting into the shell body the drainage groove stator heat dissipation chamber the water conservancy diversion hole after by exhaust hole discharges.

9. A power tool according to claim 8, wherein: the shell comprises a head end shell, a middle shell and a tail end shell which are sequentially connected, the working part is assembled on the head end shell, the stator is positioned in the middle shell, and the power output end of the rotor extends to the head end shell and is in transmission connection with the working part; the air guide sleeve and the flow guide sleeve are respectively arranged at the joint of the middle shell and the head end shell as well as the tail end shell; the air inlet is arranged on the tail end shell; the exhaust hole is formed in the head end shell.

10. An electric tool according to claim 4, wherein: the stator periphery is laid several heat dissipation teeth along, and the heat dissipation tooth extends to by stator periphery in the stator heat dissipation intracavity.