edger

Abstract

The utility model provides a kind of edge trimmer, comprising: shell, with the air inlet and exhaust port of intercommunication;Motor, is housed in shell, with the stator and rotor of interconnection, rotor has rotor core;Fan, is housed in shell, and the airflow generated by rotation is inhaled from air inlet, flows through stator and rotor, and is discharged from exhaust port;Airflow guide element, between motor and fan, with the air hole of penetration;The hole diameter of air hole is not less than the outer diameter of rotor core and not greater than the inner diameter of exhaust port.

Description

Technical Field

[0001] This utility model relates to an edge trimming machine, and more particularly to an edge trimming machine used in decoration, construction and other occasions. Background Technology

[0002] A trimming machine is a power-driven output unit that rotates to trim and groove wood and other processed parts. It is widely used in the construction and decoration industries.

[0003] Existing trimming machines typically consist of a housing, a motor housed within the housing, and a fan mounted at the front of the motor. This fan is usually an axial fan, which, when rotating, draws cooling air into the housing to dissipate heat from the motor. However, when the cooling airflow during trimming exits from the air gap between the rotor and stator, it disperses directly towards the stator side, resulting in relatively less airflow on the rotor side. Consequently, heat on the rotor side is not dissipated, leading to a higher overall temperature rise in the motor. Furthermore, when heat is transferred to the housing, users cannot hold the machine for extended periods, further compromising comfort and a pleasant user experience.

[0004] Therefore, it is determined that it is necessary to provide an improved trimming machine to overcome the shortcomings of the existing technology. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an edge trimming machine with an airflow guiding element to improve the overall heat dissipation performance of the edge trimming machine.

[0006] The present invention can solve the existing technical problems by adopting the following technical solution:

[0007] A trimming machine, comprising:

[0008] A housing having an air inlet and an exhaust outlet that are in communication with each other;

[0009] An electric motor, housed within the housing, the motor having a stator and a rotor interconnected, the rotor having a rotor core;

[0010] A fan, housed in the housing, wherein the cooling airflow generated by the rotation of the fan is drawn in from the air inlet, flows through the stator and the rotor, and is discharged from the exhaust port;

[0011] Also includes:

[0012] An airflow guiding element is located between the motor and the fan, and the airflow guiding element has a vent.

[0013] The opening diameter of the vent hole is not less than the outer diameter of the rotor core and not greater than the inner diameter of the exhaust port.

[0014] A further improvement is as follows: the housing has a first housing, a second housing, and a third housing that are interconnected. The first housing is housed within the second housing. The radially outer end of the second housing extends beyond the radially outer end of the third housing. The air inlet is disposed in the third housing. The exhaust port is disposed in the second housing. The airflow guiding element abuts between the first housing and the second housing.

[0015] A further improvement is as follows: the airflow guiding element includes a base and a guiding portion extending from the base toward the motor, and the vent is located radially inside the guiding portion and penetrates the base.

[0016] A further improvement is as follows: the base is provided with a limiting part on the radially outer side of the guide part, and the first housing abuts against the outer side of the guide part and the end face of the limiting part facing the motor.

[0017] A further improvement is that the base is a thin-walled ring, and the guide portion is at least partially perpendicular to the base.

[0018] A further improvement is as follows: the stator has a stator core abutting against the first housing and a stator winding connected to the stator core, the rotor has an armature winding connected to the rotor core and a motor shaft, and at least a portion of the stator winding and the armature winding extend into the vent hole.

[0019] A further improvement is as follows: one end of the motor shaft is supported in the first bearing chamber of the second housing, and the other end of the motor shaft is supported in the second bearing chamber of the third housing. The exhaust port is formed between the first bearing chamber and the inner wall of the first housing. The radial outer end of the vent hole extends no more than the radial outer end of the first bearing chamber, and the outer wall of the rotor core extends no more than the radial outer end of the vent hole.

[0020] A further improvement is as follows: the base includes a guide plate located radially inside the guide portion, the guide plate is connected to the limiting portion and extends in an arc shape, and the vent hole penetrates the guide plate.

[0021] A further improvement is that the airflow guiding element has a mounting portion extending from the base toward the stator, and the mounting portion is connected to the stator core by fasteners.

[0022] A further improvement is as follows: the fan has a hub portion mounted on the motor shaft and a blade portion extending radially outward from the hub portion, and the projection of the hub portion onto the axial end face of the rotor core is accommodated in the vent hole.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] An airflow guiding element was added between the motor and fan of the trimming machine to change the direction of the cooling airflow, effectively adjusting the ratio of cooling airflow between the stator and rotor, and reducing the overall temperature rise of the motor. Specifically:

[0025] The opening diameter of the vent is set to be no less than the outer diameter of the rotor core, that is, the outer wall of the rotor core extends no more than the radial outer end of the vent. This can prevent the air flow area of ​​the airflow guiding element from being too small due to the vent being too small, and at the same time reduce the air flow resistance, so that the fan can generate enough air flow to meet the heat dissipation requirements of the motor.

[0026] Meanwhile, setting the opening diameter of the vent hole to be no larger than the inner diameter of the exhaust port can prevent the cooling airflow at the front of the motor from spreading out. On the contrary, this setting can make the airflow fully gather at the rotor, effectively remove the heat from the rotor, make the rotor and stator dissipate heat evenly, and further suppress the overall temperature rise of the motor. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the trimming machine in the embodiment of this utility model;

[0028] Figure 2 for Figure 1 An exploded view of the trimming machine shown.

[0029] Figure 3 for Figure 1 A cross-sectional view of the trimming machine shown;

[0030] Figure 4 for Figure 2 The diagram shows the structure of the airflow guiding element in the trimming machine.

[0031] Figure 5 for Figure 4 A schematic diagram of the airflow guiding element from another perspective;

[0032] Figure 6 for Figure 3 The diagram shows the airflow inside the trimming machine.

[0033] Figure 7 yes Figure 3 The trimmer shown is not loaded. Figure 4 The airflow diagram is shown when the airflow guide element is used. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0035] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," "rear," "left," and "right," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0036] Please refer to Figures 1 to 3 The present invention provides an edge trimming machine 100, which is mainly used for edge trimming and grooving of workpieces such as wood. The edge trimming machine 100 includes a housing 1, a motor 2, an output unit 3 and a base 5.

[0037] Specifically, the housing 1 is typically cylindrical. The extension direction of the housing 1 is defined as vertical. The end of the housing 1 with the air inlet 131 is the upper end, and the end with the exhaust port 121 is the lower end. The specific design of the housing 1 can be customized according to actual conditions. Optionally, the housing 1 includes a first housing 11, a second housing 12, and a third housing 13. The first housing 11 and the third housing 13 are made of resin material, and the second housing 12 is made of aluminum.

[0038] Furthermore, the first housing 11 is fitted inside the second housing 12, and the upper end of the first housing 11 is connected to the lower end of the third housing 13. The upper end of the second housing 12 is connected to the lower end of the third housing 13, and the radially outer end of the second housing 12 extends no more than the radially outer end of the third housing 13. An air inlet 131 is disposed on the third housing 13, and an exhaust outlet 121 is disposed on the second housing 12. The air inlet 131 and the exhaust outlet 121 are spatially connected.

[0039] The motor 2 includes a stator 21, a rotor 22 and a motor shaft 23. The motor shaft 23 is rotatably mounted inside the housing 1. The rotor 22 is mounted on the motor shaft 23. The stator 21 is mounted between the rotor 22 and the housing 1. A fixed air gap 24 is formed between the stator 21 and the rotor 22.

[0040] Specifically, the motor 2 is housed within the housing 1, and the motor shaft 23 extends vertically. The lower end of the motor shaft 23 is supported within the first bearing chamber 122 of the second housing 12, and the upper end of the motor shaft 23 is supported within the second bearing chamber (not shown) of the third housing 13. A fan 25 is mounted at the lower end of the motor shaft 23. The fan 25 includes a hub 251 mounted on the motor shaft 23 and fan blades 252 extending radially outward from the hub 251. The motor shaft 23 drives the fan blades 252 to rotate, thereby drawing in cooling airflow F from the air inlet 131, flowing through the space between the stator 21 and the housing 1, and the air gap 24 between the stator 21 and the rotor 22, and discharging from the exhaust port 121. The first bearing chamber 122 has an annular structure, and the exhaust port 121 is an annular space formed outside the first bearing chamber 122. Alternatively, the exhaust port 121 may be a series of scattered through holes, with multiple exhaust ports 121 arranged around the outside of the first bearing chamber 122.

[0041] The output unit 3 includes a chuck, a chuck nut, and a working head installed at the lower end of the motor shaft 23. The chuck is installed in the mounting hole at the lower end of the motor shaft 23, and the chuck nut is threaded into the outer wall of the lower end of the motor shaft 23. The working head is installed in the chuck and can be a woodworking tool such as a milling cutter. The user can replace the working head by screwing the chuck.

[0042] The base 5 is mounted on the outside of the second housing 12 and is C-shaped with an opening 51. An operating mechanism 52 is connected to the opening 51, which allows the size of the opening 51 to be adjusted so that the base 5 can be adapted to trimming machines 100 of different sizes. In addition, the operating mechanism 52 can also change the relative position of the base 5 and the second housing 12 in the vertical direction, thereby enabling the working head 33 to perform trimming operations in different scenarios.

[0043] Furthermore, the stator 21 has a stator core 111 abutting against the first housing 11 and a stator winding 112 connected to the stator core 111, the rotor 22 has a rotor core 221 and an armature winding 222 connected to the rotor core 221, the air gap 24 is located between the stator winding 112 and the rotor core 221, and the armature winding 222 is located inside the stator winding 112.

[0044] Additionally, this embodiment provides an airflow guiding element 41, please refer to... Figures 2 to 5 As shown, the airflow guiding element 41 is disposed between the motor 2 and the fan 25 to converge the airflow after it flows out of the motor 2, so that when the airflow flows out of the air gap 24, it can converge more on the stator winding 112 and armature winding 222 side.

[0045] Specifically, the airflow guiding element 41 includes a base 41b and a guiding portion 41c extending from the base 41b toward the motor 2. In this embodiment, both the base 41b and the guiding portion 41c are thin-walled annular. The base 41b extends radially, and the guiding portion 41c extends axially, that is, the guiding portion 41c extends toward the motor 2 perpendicular to the base 41b. The guiding portion 41c divides the base 41b into a limiting portion 41d on the radially outer side and a guide plate 41b1 on the radially inner side. The guide plate 41b1 is connected to the limiting portion 41d and extends in an arc shape. A vent hole 41a penetrates the inner side of the guide plate 41b1. The vent hole 41a has the following relationship: the opening diameter d1 of the vent hole 41a is not less than the outer diameter d2 of the rotor core 221 and not greater than the inner diameter d3 of the exhaust port 121.

[0046] Furthermore, the airflow guiding element 41 has a mounting portion 411 extending from the guide plate 41b1 toward the stator 21, and the mounting portion 411 is connected to the stator core 111 by fasteners 412 such as screws. After the airflow guiding element 41 is installed and fixed, the lower end of the first housing 11 abuts against the outer side of the guiding portion 41c and the end face of the limiting portion 41d facing the stator 21, while the second housing 12 abuts against the end face of the base 41b facing away from the stator 21. At the same time, at least a portion of the stator winding 112 and the armature winding 222 extend into the vent hole 41a, and the projection of the hub portion 251 on the rotor core 221 is located radially inside the vent hole 41a.

[0047] Please refer to Figures 2 to 6 Since the guide portion 41c of the airflow guiding element 41 abuts against the inner wall of the first housing 11 after installation, the cooling airflow F, after entering the trimmer 100, accumulates more in the air gap 24. At this time, the stator 21 and rotor 22 on the upper side of the motor have been sufficiently cooled. Furthermore, when the cooling airflow F flows out of the air gap 24, it will accumulate at the guide plate 41b1 along the inner wall of the guide portion 41c to cool the armature winding 222 at the front end of the rotor 22. In this way, the overall temperature rise of the motor 2 can be effectively controlled. Subsequently, the airflow will flow out from the vent 41a along the arc surface on the guide plate 41b1, and flow to the exhaust port 121, and finally be discharged from the housing 1.

[0048] Figure 7 This is an airflow diagram of the trimming machine 100 without the airflow guiding element 41 installed. It shows that when the cooling airflow F flows out from the air gap 24 between the rotor 22 and the stator 21, it flows radially outwards towards the stator 21 and then exits from the exhaust port 121. Under this flow pattern, most of the cooling airflow F does not flow through the armature winding 222 at the front end of the rotor 22, and this part of the armature winding 222 does not receive effective heat dissipation. Therefore, after installing the airflow guiding element 41, the overall temperature rise of the motor 2 is effectively suppressed.

[0049] In addition, in this embodiment, the opening diameter of the vent 41a is set to be no less than the outer diameter of the rotor core 221, that is, the outer wall of the rotor core 221 extends no more than the radial outer end of the vent 41a. This prevents the airflow area of ​​the airflow guiding element 41 from being too small due to the vent 41a being too small, and at the same time reduces the airflow resistance, so that the fan 25 can generate sufficient airflow to meet the heat dissipation requirements of the motor 2. At the same time, setting the opening diameter of the vent 41a to be no greater than the inner diameter of the exhaust port 121, that is, the radial outer end of the vent 41a extends no more than the radial outer end of the first bearing chamber 122, allows the cooling airflow F to be more concentrated at the armature winding 222 at the front end of the rotor, further improving the overall heat dissipation effect of the motor 2.

[0050] Those skilled in the art will readily understand that many other alternatives to the trimming machine of this utility model exist without departing from the principles and scope of this utility model. The scope of protection of this utility model is determined by the claims.

Claims

1. A trimming machine, comprising: A housing having an air inlet and an exhaust outlet that are in communication with each other; An electric motor, housed within the housing, the motor having a stator and a rotor interconnected, the rotor having a rotor core; A fan, housed in the housing, wherein the cooling airflow generated by the rotation of the fan is drawn in from the air inlet, flows through the stator and the rotor, and is discharged from the exhaust port; Its characteristic is that it further includes: An airflow guiding element is located between the motor and the fan, and the airflow guiding element has a vent. The opening diameter of the vent hole is not less than the outer diameter of the rotor core and not greater than the inner diameter of the exhaust port.

2. The trimming machine according to claim 1, characterized in that: The housing has a first housing, a second housing, and a third housing that are connected to each other. The first housing is housed within the second housing. The radially outer end of the second housing extends beyond the radially outer end of the third housing. The air inlet is disposed in the third housing. The exhaust port is disposed in the second housing. The airflow guiding element abuts between the first housing and the second housing.

3. The trimming machine according to claim 2, characterized in that: The airflow guiding element includes a base and a guide portion extending from the base toward the motor, wherein the vent is located radially inside the guide portion and penetrates the base.

4. The trimming machine according to claim 3, characterized in that: The base is provided with a limiting part on the radially outer side of the guide part, and the first housing abuts against the outer side of the guide part and the end face of the limiting part facing the motor.

5. The trimming machine according to claim 4, characterized in that: The base is a thin-walled ring, and the guide portion is at least partially perpendicular to the base.

6. The trimming machine according to claim 3, characterized in that: The stator has a stator core abutting against the first housing and a stator winding connected to the stator core, and the rotor has an armature winding connected to the rotor core and a motor shaft, with at least a portion of the stator winding and the armature winding extending into the vent.

7. The trimming machine according to claim 6, characterized in that: One end of the motor shaft is supported in the first bearing chamber of the second housing, and the other end of the motor shaft is supported in the second bearing chamber of the third housing. The exhaust port is formed between the first bearing chamber and the inner wall of the first housing. The radial outer end of the vent hole extends no more than the radial outer end of the first bearing chamber, and the outer wall of the rotor core extends no more than the radial outer end of the vent hole.

8. The trimming machine according to claim 5, characterized in that: The base includes a guide plate disposed radially inside the guide portion, the guide plate is connected to the limiting portion, and the vent hole penetrates the guide plate.

9. The trimming machine according to claim 8, characterized in that: The airflow guiding element has a mounting portion extending from the base toward the stator, the mounting portion being connected to the stator core by fasteners.

10. The trimming machine according to claim 1, characterized in that: The fan has a hub portion mounted on the motor shaft and a blade portion extending radially outward from the hub portion, the projection of the hub portion onto the axial end face of the rotor core being received in the vent hole.

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