Electric circular saw with dust absorption and heat dissipation function

Abstract

The application discloses an electric circular saw with dust suction and heat dissipation functions, and the dust suction and heat dissipation mechanism comprises a bevel gear arranged on an output shaft and a fan assembly arranged on the output shaft. The fan assembly constructs two channels in a shell, and has two sets of fans. One set of the fans generates suction air for dust suction and heat dissipation, and the other set of the fans is used for auxiliary heat dissipation. The dust suction and heat dissipation mechanism is arranged to generate suction air in the shell, and the generated suction air is connected with a dust collecting box through a pipeline to suck the cutting generated waste and dust into the dust collecting box. The generated suction air is discharged from a heat dissipation hole after being used for heat dissipation of a motor and a circuit board in the first channel, and meanwhile, the locked outer blade revolves with an outer fixed ring in the second channel to generate air flow. The direction of the air flow is related to the deflection angle of the outer blade, and the air flow can be used for heat dissipation of the motor and the circuit board regardless of the direction. Double heat dissipation can guarantee that the motor works at an optimal temperature.

Description

Technical Field

[0001] This invention relates to a handheld chainsaw, and more particularly to a circular chainsaw with dust extraction and heat dissipation functions. Background Technology

[0002] In recent years, the number of users of handheld electric circular saws has been increasing, and the functions of handheld electric circular saws have also become more and more numerous. During use, the motor and circuit board generate a lot of heat. If this heat cannot be dissipated in a timely and effective manner, it will greatly affect the lifespan of the motor and components, or even damage the motor and components, causing the handheld power tool to malfunction.

[0003] Currently, external vacuum cleaners are typically used for cleaning chainsaws, as shown in the following video: https: / / www.bilibili.com / video / BV1fZ421p7Cb / . The chainsaw in the video is used in conjunction with an external vacuum cleaner via a connecting tube and hose on its casing. However, while handheld chainsaws are advantageous in their flexibility and portability, if they lack a dust collection function, a separate vacuum cleaner must be carried each time they are used, negating their convenience. Summary of the Invention

[0004] Given that existing chainsaws require an external dust collection device to collect dust, which negates the portability advantage of handheld chainsaws, this invention provides an electric circular saw with dust collection and heat dissipation functions.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: an electric circular saw with dust collection and heat dissipation function, comprising:

[0006] Electric motor;

[0007] A circuit board that connects to the motor and power supply to control the motor's operation;

[0008] The output shaft is driven by a motor.

[0009] The saw blade is detachably mounted on the output shaft;

[0010] The housing has a hollow cylindrical body on one side for mounting the motor and circuit board. The outer end of the cylindrical body has an outer sealing plate with heat dissipation holes, and the inner end of the cylindrical body has a sealed inner sealing plate. The output shaft passes through the inner sealing plate and is rotatably and sealedly connected to the inner sealing plate. The inner side wall has an annular mounting platform, and the side wall of the housing outside the mounting platform has a multi-purpose hole.

[0011] The protective cover is installed on the housing. One side of the cover has a dust collection box with an inner cavity. The inner wall of the dust collection box has a feed hole that extends to the outside of the cutting blade. The inner wall of the dust collection box also has an air suction port, which is connected to the inside of the housing through a pipe.

[0012] The dust extraction and heat dissipation mechanism includes a fan assembly housed within a housing. The fan assembly includes an inner fixed ring fixedly connected to an output shaft, inner blades mounted on the inner fixed ring, an outer fixed ring fixed to the outer end of the inner blades and driven by a motor, outer blades rotatably mounted on the outer fixed ring via a rotating shaft, and a planetary gear set disposed within the outer fixed ring and driven by the outer fixed ring. A bevel gear is mounted on the axle of the sun gear in the planetary gear set, and a bevel gear is mounted on the inner end of the rotating shaft. The bevel gear meshes with the bevel gear, causing the outer blades to rotate on their own axis while revolving around the sun gear. The inner and outer blades are offset in the axial direction of the output shaft. The outer fixed ring is rotatably mounted on a mounting platform via a sealed bearing, forming a first channel and a second channel inside and outside the outer fixed ring, respectively. The first channel generates suction to extract waste chips generated during cutting and dissipates heat from the motor and circuit board, while the second channel generates airflow to dissipate heat from the motor and circuit board.

[0013] Preferably, the outer fixed ring is provided with external teeth, and the output end of the motor is directly or indirectly connected to the external teeth for transmission.

[0014] Preferably, the outer fixed ring is provided with an internal gear ring, and the planetary gear set includes planetary gears that mesh with the internal gear ring and a sun gear that meshes with the planetary gears.

[0015] Preferably, the planetary gear is provided with a bearing rod, the bearing rod is provided with an annular planetary carrier with ventilation holes, the outer wall of the planetary carrier is provided with a ring of adjusting teeth, and the housing is provided with a locking structure to lock the adjusting teeth.

[0016] Preferably, the locking structure includes a locking gear disposed on the housing and an angle sensor disposed at the locking gear. The locking gear meshes with the adjusting gear and the housing is provided with an extension hole. The locking gear extends out of the extension hole and a toggle block is slidably disposed on the housing at the extension hole. The inner wall of the toggle block is arc-shaped and is provided with a plurality of locking tooth grooves for the teeth of the locking gear to extend into and lock the locking gear.

[0017] Preferably, the outer blades include at least two blades, with each outer blade array evenly distributed around the output shaft; the inner blades include at least two blades, with each inner blade array evenly distributed around the output shaft.

[0018] Preferably, the outer blades are planar plate-shaped fan blades, the inner blades are airfoil-shaped fan blades, and the inner blades form an angle of 30-45° with the radial tangent of the output shaft.

[0019] Preferably, the protective cover is provided with a dust collection part, the dust collection part is provided with a slot with a chip inlet hole, the side wall of the slot is provided with a through hole, the dust collection box is inserted into the slot and the air inlet on the dust collection box is opposite to the through hole after the dust collection box is inserted, and the air inlet of the integrated box is provided with a filter cover for blocking dust.

[0020] Preferably, the protective cover includes a detachably connected left cover and a right cover. After the left cover and the right cover are connected, they form an inverted U-shaped structure that covers the upper side of the saw blade inside the opening. The inner wall of the tail side of one of the left cover and the right cover is provided with several spaced baffles. After the dust collection box is installed, it abuts against the tail side of the baffles and the gap between the baffles is opposite to the feed hole of the dust collection box.

[0021] Preferably, the housing is provided with a grip, and a control switch is provided at the grip. The control switch and the power supply are both connected to the circuit board through a power cable passing through the inner sealing plate. The inner sealing plate is provided with a wire sealing ring to seal the wire passage position. The rear side of the grip is provided with a power mounting slot and a battery pack can be detachably inserted. The housing is also provided with a multi-angle adjustable support frame with an extension hole through which the saw blade extends. A first seat is rotatably provided on the housing, and a second seat is rotatably provided on the first seat. The first seat rotates in the XZ plane, and the second seat rotates in the YZ plane. The support frame is provided on the second seat.

[0022] Compared with the prior art, the advantages of the present invention are as follows: The present application generates suction in the housing by setting a dust collection and heat dissipation mechanism, and then draws the waste chips and dust generated by cutting into the dust collection box through a pipe. The generated suction dissipates heat to the motor and circuit board in the first channel and is discharged from the heat dissipation hole. At the same time, after locking, the outer blades follow the outer fixed ring to revolve and generate airflow in the second channel. The direction of the airflow is related to the deflection angle of the outer blades. Regardless of its direction, it can dissipate heat to the motor and circuit board. Dual heat dissipation can ensure that the motor works at the optimal temperature. Attached Figure Description

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0024] Figure 1 This is a side view of this application;

[0025] Figure 2 This is a perspective view of the present application;

[0026] Figure 3 This is an exploded view of this application;

[0027] Figure 4 This is a cross-sectional view of this application;

[0028] Figures 5-8 This is an exploded view of the fan assembly.

[0029] Figure 9A 3D view of the fan assembly (excluding the outer retaining ring);

[0030] Figure 10 Exploded view of the protective cover and dust collection box;

[0031] In the diagram: 10. Housing; 101. Grip; 102. Protective cover; 1021. Dust collection section; 1022. Slot; 1023. Chip inlet; 103. Cylindrical body; 1031. Outer sealing plate; 10311. Heat dissipation hole; 1032. Inner sealing plate; 104. Mounting platform; 201. Dust collection box; 2011. Feed inlet; 202. Pipe; 30. Bracket; 40. Battery pack; 50. Saw blade; 601. Motor; 602. Fan assembly; 6021. Inner retaining ring; 6022. Inner... Blade; 6023, outer fixed ring; 60231, external gear; 60232, internal gear ring; 6024, outer blade; 6025, rotating shaft; 6026, bevel gear; 6027, conical gear; 603, output shaft; 70, planetary gear set; 701, sun gear; 7011, wheel and axle; 702, planetary gear; 7021, shaft carrier rod; 7022, planetary carrier; 70221, adjusting gear; 70222, ventilation hole; 80, locking structure; 801, locking gear; 802, actuating block. Detailed Implementation

[0032] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of the invention.

[0033] Example

[0034] Main scheme :

[0035] Electric circular saws with dust extraction and heat dissipation functions, such as Figures 1-10 As shown, it includes:

[0036] Motor 601;

[0037] A circuit board, which is connected to the motor 601 and the power supply, is used to control the operation of the motor 601;

[0038] The output shaft 603 is driven by the motor 601;

[0039] The saw blade 50 is detachably mounted on the output shaft 603;

[0040] The housing 10 has a hollow cylindrical body 103 on one side for mounting the motor 601 and the circuit board. The outer end of the cylindrical body 103 has an outer sealing plate 1031 with heat dissipation holes 10311, and the inner end of the cylindrical body 103 has a sealed inner sealing plate 1032. The output shaft 603 passes through the inner sealing plate 1032 and is rotatably and sealingly connected to the inner sealing plate 1032. The inner side wall of the housing 10 has an annular mounting platform 104, and the side wall of the housing 10 outside the mounting platform 104 has a multi-purpose hole. The protective cover 102 is set on the housing 10. The housing 102 has a dust collection box 201 with an inner cavity on one side. The inner cavity wall of the dust collection box 201 has a feed hole 2011 extending to the outside of the cutting blade. The inner cavity wall of the dust collection box 201 also has a suction port, which is connected to the inside of the housing 10 through a pipe 202.

[0041] The dust extraction and heat dissipation mechanism includes a fan assembly 602 mounted on an output shaft 603. The fan assembly 602 includes an inner retaining ring 6021 fixedly connected to the output shaft 603, inner blades 6022 mounted on the inner retaining ring 6021, an outer retaining ring 6023 fixed to the outer end of the inner blades 6022 and driven by a motor 601, outer blades 6024 rotatably mounted on the outer retaining ring 6023 via a rotating shaft 6025, and a planetary gear set 70 mounted inside the outer retaining ring 6023 and connected to it via a transmission drive. The axle 7011 of the sun gear 701 in the planetary gear set 70 is provided with… The inner end of the bevel gear 6027 and the rotating shaft 6025 is provided with a bevel gear 6026. The bevel gear 6026 meshes with the bevel gear 6027, causing the outer blade 6024 to rotate while revolving around the sun. The inner blade 6022 and the outer blade 6024 are offset in the axial direction of the output shaft 603. The outer fixing ring 6023 is rotatably mounted on the mounting platform 104 through a sealed bearing, so that the inner and outer sides of the outer fixing ring 6023 form a first channel and a second channel, respectively. The first channel is used to generate suction to pick up the waste chips generated by cutting and to dissipate heat from the motor 601 and the circuit board. The second channel generates airflow to dissipate heat from the motor 601 and the circuit board. This solution generates suction within the housing 10 by setting up a dust collection and heat dissipation mechanism. The suction then connects to a dust collection box 201 via a pipe 202 to draw in cutting debris and dust. The generated suction dissipates heat to the motor 601 and circuit board in the first channel before exiting through the heat dissipation hole 10311. Simultaneously, after locking, the outer blade 6024 revolves with the outer fixing ring 6023, generating airflow in the second channel. The direction of this airflow is related to the deflection angle of the outer blade 6024; regardless of its direction, it dissipates heat to the motor 601 and circuit board. This dual heat dissipation ensures that the motor 601 operates at the optimal temperature. During operation, including... In the following two states, in the first state, when the sun gear 701 is not locked, the outer blade 6024 will be adjusted to be perpendicular to the axis of the outer fixed ring 6023. At this time, the outer blade 6024 does not rotate or swings slightly. At this time, the motor 601 is in a low-load operation state. When auxiliary heat dissipation is required in the second channel, the angle of the planetary carrier 7022 is adjusted and then locked. At this time, the outer blade 6024 revolves and rotates. By adjusting the rotation angle of the planetary carrier 7022, the angle of the outer blade 6024 can be roughly adjusted. Changing the angle of the outer blade 6024 can change the direction and magnitude of the wind force, thereby matching different heat dissipation requirements.

[0042] Preferably, the outer fixed ring 6023 is provided with an external tooth 60231, and the output end of the motor 601 is directly or indirectly connected to the external tooth 60231.

[0043] Preferably, the outer fixed ring 6023 is provided with an internal gear ring 60232, and the planetary gear set 70 includes a planetary gear 702 that meshes with the internal gear ring 60232 and a sun gear 701 that meshes with the planetary gear 702.

[0044] Preferably, the planetary gear 702 is provided with a bearing rod 7021, the bearing rod 7021 is provided with an annular planetary carrier 7022 with ventilation holes 70222, the outer side wall of the planetary carrier 7022 is provided with a ring of adjusting teeth 70221, and the housing 10 is provided with a locking structure 80 for locking the adjusting teeth 70221.

[0045] Preferably, the locking structure 80 includes a locking gear 801 disposed on the housing 10 and an angle sensor disposed at the locking gear 801. The locking gear 801 meshes with the adjusting gear 70221, and the housing 10 has an extension hole. A portion of the locking gear 801 extends out of the extension hole, and an actuating block 802 is slidably disposed on the housing 10 at the extension hole. The inner wall of the actuating block 802 is arc-shaped, and its inner wall has a plurality of locking tooth grooves for the teeth of the locking gear 801 to extend into and lock the locking gear 801. This solution locks the locking gear 801 by setting the locking gear 801 and exposing its portion, and then locking it by sliding the actuating block 802. In addition, the angle sensor allows for precise actuation of the locking gear 801. Since the outer fan blades will automatically adjust their angle when they are not locked, they will eventually adjust to a direction parallel to the rotation direction of the outer fixed ring 6023. Therefore, each time they are adjusted, the approximate angle of the planetary carrier 7022 and the outer blades 6024 is determined by the angle sensor based on this posture.

[0046] Blade portion :

[0047] like Figure 8 As shown, the outer blades 6024 include at least two blades, and the array of each outer blade 6024 is evenly distributed around the output shaft 603; the inner blades 6022 include at least two blades, and the array of each inner blade 6022 is evenly distributed around the output shaft 603.

[0048] Preferably, the outer blade 6024 is a planar plate-shaped fan blade, and the inner blade 6022 is an airfoil-shaped fan blade. The planar plate-shaped fan blade can reduce its rotational drag, while the airfoil-shaped fan blade can provide stronger airflow. The blade shape can also be changed according to requirements; the inner blade 6022 forms a 30-45° angle with the radial section of the output shaft 603.

[0049] Protective cover portion :

[0050] like Figure 10As shown, the protective cover 102 is provided with a dust collection part 1021, and the dust collection part 1021 is provided with a slot 1022 with a chip inlet hole 1023. The side wall of the slot 1022 is provided with a through hole. The dust collection box 201 is inserted into the slot 1022 and the air intake on the dust collection box 201 is opposite to the through hole after insertion. The air intake of the integrated box is provided with a filter cover for blocking dust. A sealing ring is provided between the dust collection box 201 and the slot 1022. After the dust collection box 201 is inserted, its tail end forms a seal with the slot 1022, and only the chip inlet hole 1023 can allow air to enter. Preferably, the dust collection box 201 is provided with an upper cavity and a lower cavity separated by a partition. The lower cavity contains dust collection liquid, the upper cavity has an air inlet pipe that leads into the dust collection liquid, and the lower cavity has an air outlet pipe. The inner end of the air outlet pipe is located above the surface of the dust collection liquid, and the outer end of the air outlet pipe is connected to the air suction port. This allows large particles of waste to be collected in the upper cavity, while small particles of dust are sucked into the dust collection liquid for absorption.

[0051] like Figure 10 As shown, the protective cover 102 includes a detachably connected left cover and a right cover. After the left cover and the right cover are connected, they form an inverted U-shaped structure that covers the upper side of the saw blade 50 inside the opening. The inner wall of the tail side of one of the left cover and the right cover is provided with several spaced baffles. After the dust collection box 201 is installed, it abuts against the tail side of the baffles and the gap between the baffles is opposite to the feed hole of the dust collection box 201.

[0052] In addition, the opening of the protective cover 102 is provided with a rotating and sliding inner cover. When the inner cover rotates inward to the maximum extent, the chip inlet is not blocked.

[0053] Housing portion :

[0054] like Figures 1-3 As shown, the housing 10 is provided with a grip part 101, and a control switch is provided at the grip part 101. The control switch and the power supply are connected to the circuit board through a power line passing through the inner sealing plate 1032. The inner sealing plate 1032 is provided with a wire sealing ring for sealing the wire passage position. The rear side of the grip part 101 is provided with a power installation slot and a battery pack 40 can be detachably inserted.

[0055] Rest portion :

[0056] like Figures 1-3 As shown, the housing 10 is also provided with a multi-angle adjustable support 30, and the support 30 is provided with an extension hole, through which the saw blade 50 extends.

[0057] Preferably, a first seat is rotatably mounted on the housing 10, and a second seat is rotatably mounted on the first seat. The first seat rotates in the XZ plane, and the second seat rotates in the YZ plane. A support frame 30 is mounted on the second seat. The first and second seats are not shown in the figures.

[0058] The electric circular saw with dust extraction and heat dissipation functions provided by this invention has been described above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand this invention and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. An electric circular saw with dust extraction and heat dissipation functions, characterized in that, include: Electric motor; A circuit board that connects to the motor and power supply to control the motor's operation; The output shaft is driven by a motor. The saw blade is detachably mounted on the output shaft; The housing has a hollow cylindrical body on one side for mounting the motor and circuit board. The outer end of the cylindrical body has an outer sealing plate with heat dissipation holes, and the inner end of the cylindrical body has a sealed inner sealing plate. The output shaft passes through the inner sealing plate and is rotatably and sealedly connected to the inner sealing plate. The inner side wall has an annular mounting platform, and the side wall of the housing outside the mounting platform has a multi-purpose hole. The protective cover is installed on the housing. One side of the cover has a dust collection box with an inner cavity. The inner wall of the dust collection box has a feed hole that extends to the outside of the cutting blade. The inner wall of the dust collection box also has an air suction port, which is connected to the inside of the housing through a pipe. A dust extraction and heat dissipation mechanism includes a fan assembly inside a housing. The fan assembly includes an inner fixed ring fixedly connected to an output shaft, inner blades disposed on the inner fixed ring, an outer fixed ring fixed to the outer end of the inner blades and driven by a motor, an outer blade rotatably disposed on the outer fixed ring via a rotating shaft, and a planetary gear set disposed inside the outer fixed ring and drivenly connected to the outer fixed ring. A bevel gear is provided on the axle of the sun gear in the planetary gear set, and a bevel gear is provided at the inner end of the rotating shaft. The bevel gear meshes with the bevel gear, causing the outer blades to rotate on their own axis while revolving around the sun gear. The inner blades and the outer blades are offset in the axial direction of the output shaft. The outer fixed ring is rotatably disposed on a mounting platform via a sealed bearing, forming a first channel and a second channel inside and outside the outer fixed ring, respectively. The first channel is used to generate suction to extract waste chips generated during cutting and to dissipate heat from the motor and circuit board. The second channel generates airflow to dissipate heat from the motor and circuit board. The outer fixed ring has external teeth, and the output end of the motor is directly or indirectly connected to the external teeth for transmission. The outer fixed ring has an internal gear ring, and the planetary gear set includes planetary gears that mesh with the internal gear ring and a sun gear that meshes with the planetary gears. The planetary gears have a carrier rod, and the carrier rod has an annular planetary carrier with ventilation holes. The outer side wall of the planetary carrier has a ring of adjusting teeth. The housing has a locking structure for locking the adjusting teeth. The locking structure includes a locking gear on the housing and an angle sensor on the locking gear. The locking gear meshes with the adjusting teeth, and the housing has an extension hole. The locking gear extends out of the extension hole, and a toggle block slides on the housing at the extension hole. The inner wall of the toggle block is arc-shaped, and its inner wall has several locking tooth grooves for the locking gear teeth to extend into and lock the locking gear.

2. The electric circular saw with dust extraction and heat dissipation function according to claim 1, characterized in that, The outer blades consist of at least two blades, with each outer blade array evenly distributed around the output shaft; the inner blades consist of at least two blades, with each inner blade array evenly distributed around the output shaft.

3. The electric circular saw with dust extraction and heat dissipation function according to claim 1, characterized in that, The outer blades are flat plate-shaped fan blades, and the inner blades are airfoil-shaped fan blades. The inner blades form an angle of 30-45° with the radial tangent of the output shaft.

4. The electric circular saw with dust extraction and heat dissipation function according to claim 1, characterized in that, The protective cover is equipped with a dust collection section, which has a slot with a chip inlet. The side wall of the slot has a through hole. The dust collection box is inserted into the slot, and after the dust collection box is inserted, its air intake is opposite to the through hole. The air intake of the integrated box is equipped with a filter cover for blocking dust.

5. The electric circular saw with dust extraction and heat dissipation function according to claim 1, characterized in that, The protective cover includes a detachable left cover and a right cover. After the left cover and the right cover are connected, they form an inverted U-shaped structure that covers the upper side of the saw blade inside the opening. The inner wall of the tail side of one of the left cover and the right cover is provided with several spaced baffles. After the dust collection box is installed, it abuts against the tail side of the baffles and the gap between the baffles is opposite to the feed hole of the dust collection box.

6. The electric circular saw with dust extraction and heat dissipation function according to claim 1, characterized in that, The housing has a grip, and a control switch is located on the grip. The control switch and power supply are connected to the circuit board via a power cable passing through the inner sealing plate. The inner sealing plate has a wire sealing ring to seal the wire passage. The rear side of the grip has a power mounting slot and a battery pack can be detachably inserted. The housing also has a multi-angle adjustable support with an extension hole through which the saw blade extends. A first seat is rotatably mounted on the housing, and a second seat is rotatably mounted on the first seat. The first seat rotates in the XZ plane, and the second seat rotates in the YZ plane. The support is mounted on the second seat.

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