Electric circular saw

Abstract

The utility model provides an electric circular saw which aims at solving the problem that chippings are easily sucked into an air inlet hole in an existing electric circular saw. The electric circular saw comprises a shell, a motor and a saw blade. The saw blade is rotationally arranged on the shell, and the motor is fixedly arranged in the shell. The saw blade is in transmission connection with the motor; the shell comprises a hollow cylindrical motor mounting part, and a motor is fixedly arranged in the motor mounting part; the saw blade is positioned at one end of the motor mounting part; a first air inlet, a second air inlet and an air outlet are formed in the motor mounting part; the first air inlet is located in the end face of the end, away from the saw blade, of the motor mounting part. The second air inlet is located in the side face of the end, away from the saw blade, of the motor mounting part. Fan blades are further arranged on the motor, and parts corresponding to the fan blades are arranged on the side face of the motor mounting part; the second air inlet is provided with a corresponding shielding structure, the shielding structure is located on the inner side of the motor mounting part, and a gap is formed between the shielding structure and the second air inlet; and wood chips entering the motor mounting part are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to an electric circular saw. Background Art

[0002] An electric circular saw is a tool that uses a single-phase series-excited motor as a power source, and then drives a circular saw blade through a transmission mechanism to perform sawing operations. It has the characteristics of safety, reliability, and high work efficiency. Since the motor has a large output power, it usually generates a large amount of heat during operation, and needs to be dissipated in conjunction with the heat dissipation holes provided on the shell. For example, in the patent with authorization announcement number CN217531114U, an air inlet and an air outlet are provided on the shell to realize the circulation of air flow, thereby dissipating the heat of the motor. However, there is usually a large amount of debris in the working environment of the electric circular saw, and in traditional electric circular saws, only the demand for air intake is considered, but the obstruction of debris is ignored, so that the debris enters the working area of ​​the motor, affecting the output efficiency and service life of the motor. Therefore, there is a need for an electric circular saw that can block the debris at the air inlet. Summary of the invention

[0003] The utility model aims to solve the deficiencies of the prior art and provide an electric circular saw.

[0004] In order to solve the above problems, the utility model adopts the following solutions:

[0005] An electric circular saw comprises a shell, a motor and a saw blade; the saw blade is rotatably arranged on the shell, and the motor is fixedly arranged in the shell; the saw blade is also transmission-connected to the motor; the shell comprises a hollow cylindrical motor mounting part, and the motor is fixedly arranged inside the motor mounting part; the saw blade is located at one end of the motor mounting part; the motor mounting part is provided with a first air inlet, a second air inlet and an air outlet; wherein the first air inlet is located on the end face of the end of the motor mounting part away from the saw blade; the second air inlet is located on the side of the end of the motor mounting part away from the saw blade; the motor is also provided with fan blades, and the side of the motor mounting part is provided with a part corresponding to the fan blade; the second air inlet is provided with a corresponding shielding structure, the shielding structure is located on the inner side of the motor mounting part, and a gap is provided between the shielding structure and the second air inlet.

[0006] Furthermore, the motor mounting portion is provided with a second air inlet symmetrical about its center line.

[0007] Furthermore, the housing also includes a handle portion for grasping, and the handle portion is fixedly connected to a side surface of the motor mounting portion.

[0008] Furthermore, the handle portion is provided with a trigger and a switch connected to the motor; the trigger is rotatably arranged on the handle portion, and the switch is fixedly arranged in the handle portion; the trigger and the switch are arranged correspondingly.

[0009] Furthermore, the handle portion is also provided with a button for locking the trigger, and the button is slidably arranged in the tubular structure inside the handle portion; one end of the button extends out of the handle portion, and a spring is arranged between the other end of the button and the inner wall of the handle portion; a limit block is also arranged on the side of the button for resisting the trigger.

[0010] Furthermore, a raised sliding block is provided on the side of the button, and a sliding groove corresponding to the sliding block is provided in the tubular structure.

[0011] Furthermore, the first air inlet is a plurality of circular holes.

[0012] Furthermore, the second air inlet is a plurality of strip holes arranged in parallel.

[0013] Furthermore, the length of the stator of the motor in the axial direction is greater than the length of the rotor.

[0014] Furthermore, a gear transmission structure is provided between the motor and the saw blade.

[0015] The beneficial effects of the utility model are:

[0016] By providing a second air inlet and a shielding structure, wood chips are prevented from entering the interior of the motor mounting portion;

[0017] By setting a corresponding button at the trigger, the trigger can be locked normally to prevent accidental pulling of the trigger. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall structure of the electric circular saw of Example 1 is shown in FIG. Figure 1 ;

[0019] Figure 2 The overall structure of the electric circular saw of Example 1 is shown in FIG. Figure 2 ;

[0020] Figure 3 This is a schematic diagram of the motor mounting portion of the housing of Example 1;

[0021] Figure 4 It is an exploded view of the internal structure of the handle part of Example 1;

[0022] Figure 5 This is a schematic diagram of the motor and fan blades of Example 1.

[0023] Description of the symbols in the accompanying drawings: motor mounting part 1, first air inlet 11, second air inlet 12, air outlet 13, shielding structure 14, motor 2, stator 21, rotor 22, fan blades 23, saw blade 3, handle part 4, trigger 41, button 43, tubular structure 44, limit block 45, slider 46, slide groove 47. DETAILED DESCRIPTION

[0024] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the figures only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0026] Embodiment 1:

[0027] like Figures 1 to 5 As shown, an electric circular saw comprises a housing, a motor 2 and a saw blade 3; the saw blade 3 is rotatably arranged on the housing, and the motor 2 is fixedly arranged in the housing; the saw blade 3 is also transmission-connected with the motor 2, and the saw blade 3 rotates with the movement of the motor 2; the housing comprises a hollow cylindrical motor 2 mounting portion, and the motor 2 is fixedly arranged inside the motor mounting portion 1; the saw blade 3 is located at one end of the motor mounting portion 1, and the other end of the motor mounting portion 1 is closed; a first air inlet 11, a second air inlet 12 and an air outlet 13 are arranged on the motor mounting portion 1; wherein the first air inlet 11 is located on the end face of the end of the motor mounting portion 1 away from the saw blade 3; the second air inlet 12 is located on the side of the end of the motor mounting portion 1 away from the saw blade 3; a fan blade 23 is also arranged on the motor 2, and a portion corresponding to the fan blade 23 is arranged on the side of the motor mounting portion 1; the second air inlet 12 is provided with a corresponding shielding structure 14, the shielding structure 14 is located on the inner side of the motor mounting portion 1, and a gap is arranged between the shielding structure 14 and the second air inlet 12. The shielding structure 14 can shield the wood chips entering the interior of the click installation part to a certain extent, while the first air inlet 11 located at the end of the motor installation part 1 is far away from the working part of the saw blade 3 of the electric circular saw, so the impact is relatively small. Therefore, the shielding structure 14 is not set at the first air inlet 11.

[0028] The motor mounting portion 1 is provided with two second air inlets 12 symmetrically about its center line to achieve uniform heat dissipation of the electrodes in the motor mounting portion 1; in this example, the second air inlets 12 are a plurality of parallel strip holes; the first air inlet 11 is a plurality of round holes. The shielding structure 14 is in a strip shape, wherein the shielding structure 14 corresponds to the shape of the second air inlet 12; a set gap is maintained between the shielding structure 14 and the second air inlet 12, and the two ends of the shielding structure 14 are connected to the inner wall of the motor mounting portion 1 on both sides of the second air inlet 12.

[0029] The housing also includes a handle portion 4 for grasping, and the handle portion 4 is fixedly connected to the side of the motor mounting portion 1; a trigger 41 and a switch connected to the motor 2 are provided on the handle portion 4, and in this example, the switch is a micro switch; the trigger 41 is rotatably provided on the handle portion 4, and the switch is fixedly provided in the handle portion 4; the trigger 41 and the switch are correspondingly provided, so that the micro switch can be pressed when the trigger 41 is pulled. The handle 4 is also provided with a button 43 for locking the trigger 41. The button 43 is slidably arranged in a tubular structure 44 in the handle 4. One end of the button 43 extends out of the handle 4. A spring is arranged between the other end of the button 43 and the inner wall of the handle 4 to facilitate the reset of the button 43. A stopper 45 for abutting against the trigger 41 is also arranged on the side of the button 43. When the button 43 is bounced up by the spring force, the stopper 45 on the button 43 abuts against the trigger 41, making it difficult for the trigger 41 to be pressed. After the button 43 is pressed, the stopper 45 on the button 43 is offset from the trigger 41, so that the trigger 41 can be pressed and trigger the micro switch. In order to prevent the button 43 from rotating, a raised slider 46 is also arranged on the side of the button 43, and a slide groove 47 corresponding to the slider 46 is arranged in the tubular structure 44.

[0030] A gear transmission structure is provided between the motor 2 and the saw blade 3. The length of the stator 21 of the motor 2 in the axial direction is greater than the length of the rotor 22, and the purpose is to increase the torque of the motor 2. After the torque of the motor 2 is increased, a gear transmission structure with a smaller transmission ratio can be used to achieve the transmission between the motor 2 and the saw blade 3, and a smaller transmission ratio means that the overall volume of the gear transmission structure will also be reduced, so that the saw blade 3 can cut deeper into the object, and when cutting the same depth, a smaller saw blade 3 can be used.

[0031] During the implementation process, the second air inlet 12 is provided in cooperation with the shielding structure 14 to reduce the wood chips from entering the interior of the motor mounting part 1; and the trigger 41 is locked in a normal state by providing a corresponding button 43 at the trigger 41 to prevent the trigger 41 from being accidentally pulled.

[0032] The above description is only a specific example of the utility model and does not constitute any limitation to the utility model. Obviously, for professionals in this field, after understanding the content and principle of the utility model, it is possible to make various modifications and changes in form and details without departing from the principle and structure of the utility model, but these modifications and changes based on the idea of ​​the utility model are still within the scope of protection of the claims of the utility model.

Claims

1. An electric circular saw, comprising a housing, a motor (2) and a saw blade (3); the saw blade (3) is rotatably mounted on the housing, and the motor (2) is fixedly mounted in the housing; the saw blade (3) is also transmission-connected to the motor (2); and the characteristics are as follows: The housing comprises a hollow cylindrical motor mounting portion (1), wherein a motor (2) is fixedly arranged inside the motor mounting portion (1); a saw blade (3) is located at one end of the motor mounting portion (1); a first air inlet (11), a second air inlet (12) and an air outlet (13) are arranged on the motor mounting portion (1); wherein the first air inlet (11) is located on an end surface of the motor mounting portion (1) away from the saw blade (3); the second air inlet (12) is located on a side surface of the motor mounting portion (1) away from the saw blade (3); a fan blade (23) is also arranged on the motor (2), and a portion corresponding to the fan blade (23) is arranged on a side surface of the motor mounting portion (1); and a corresponding shielding structure (14) is arranged on the second air inlet (12), wherein the shielding structure (14) is located on the inner side of the motor mounting portion (1), and a gap is arranged between the shielding structure (14) and the second air inlet (12).

2. An electric circular saw according to claim 1, characterized in that: The motor mounting portion (1) is provided with a second air inlet (12) symmetrical about its center line.

3. An electric circular saw according to claim 1, characterized in that: The housing further comprises a handle portion (4) for grasping, and the handle portion (4) is fixedly connected to a side surface of the motor mounting portion (1).

4. An electric circular saw according to claim 3, characterized in that: The handle portion (4) is provided with a trigger (41) and a switch connected to the motor (2); the trigger (41) is rotatably arranged on the handle portion (4), and the switch is fixedly arranged in the handle portion (4); the trigger (41) and the switch are arranged correspondingly.

5. An electric circular saw according to claim 4, characterized in that: The handle portion (4) is also provided with a button (43) for locking the trigger (41), and the button (43) is slidably arranged in a tubular structure (44) in the handle portion (4); one end of the button (43) extends out of the handle portion (4), and a spring is arranged between the other end of the button (43) and the inner wall of the handle portion (4); and a limit block (45) for abutting against the trigger (41) is also arranged on the side of the button (43).

6. An electric circular saw according to claim 5, characterized in that: A protruding slider (46) is provided on the side of the button (43), and a slide groove (47) corresponding to the slider (46) is provided in the tubular structure (44).

7. An electric circular saw according to claim 1, characterized in that: The first air inlet (11) is a plurality of circular holes.

8. The electric circular saw according to claim 1, characterized in that: The second air inlet (12) is a plurality of strip-shaped holes arranged in parallel.

9. The electric circular saw according to claim 1, characterized in that: The length of the stator (21) of the motor (2) in the axial direction thereof is greater than the length of the rotor (22).

10. An electric circular saw according to claim 9, characterized in that: A gear transmission structure is provided between the motor (2) and the saw blade (3).

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