Electric circular saw with dust removal mechanism

Abstract

The utility model relates to electric tool field especially, it relates to a take dust removal mechanism's electric circular saw, including electric circular saw saw body, the side of electric circular saw saw body is installed with drive motor, and the output shaft of drive motor is installed with saw blade, and the outside cover of saw blade is equipped with main guard shield, and the outside of main guard shield has dust removal mechanism, wherein, dust removal mechanism includes centrifugal fan impeller, fairing and connecting air duct, and the centrifugal fan impeller is equipped with impeller locking piece, and impeller locking piece is connected with output shaft, and the side of centrifugal fan impeller is equipped with fairing, and fairing is connected on the outer wall of main guard shield, and fairing surrounds centrifugal fan impeller, and connecting air duct is located in fairing and main guard shield coincident area. Advantageous effects are: through dust suction port, the dust generated when cutting electric circular saw can be sucked to fairing through dust suction pipe, and through centrifugal fan impeller acting as centrifugal fan to make the existing electric circular saw reconstruction small and compact structure, and the implementation cost is low.

Description

Technical Field

[0001] This utility model relates to the field of power tools, and more particularly to an electric circular saw with a dust removal mechanism. Background Technology

[0002] Electric circular saws generate a large amount of dust when cutting materials such as wood and engineered wood. This dust sprays out from the front of the saw blade and the kerf, severely obscuring the cutting line on the workpiece. This makes it impossible for the operator to see the relative position of the saw blade and the marked line, easily causing cutting deviations. This not only affects processing accuracy and efficiency, but also increases operator fatigue due to the need to repeatedly look up to observe or blow away the dust. Furthermore, the pervasive dust also harms the operator's health.

[0003] Currently, the common solution is to use an external vacuum cleaner. However, this method has obvious drawbacks: it requires additional configuration and connection of the vacuum cleaner, making it inconvenient to move; and the suction port is usually located behind the saw blade, which is not effective at removing dust from the front of the saw blade—the most critical area of ​​the cutting line's field of vision.

[0004] According to publication number CN104943005A, a "dust-collecting cutting machine with direct-exhaust dust collection function" is disclosed. This prior art document reveals a technical solution for setting a dust collection device on a cutting machine, which achieves the dust collection function by mounting a fan impeller on the threads of the rotor shaft.

[0005] However, the aforementioned patents have the following drawbacks:

[0006] 1. The impeller of the fan is installed on the thread of the rotor shaft. This structure means that there is still room for improvement in the dust collection effect. The dust capture efficiency in front of the cutting line is not ideal, and the core problem of the cutting field of vision is not completely solved.

[0007] 2. The dust extraction channel design of this solution will result in greater airflow resistance, affecting dust removal efficiency. In addition, the overall structure requires a significant modification to the existing electric circular saw, resulting in higher implementation costs. Utility Model Content

[0008] In order to overcome the shortcomings of the prior art, the present invention solves the following technical problem: the dust generated during the cutting of the electric circular saw can be sucked into the guide shroud through the dust suction port and the centrifugal fan impeller can act as a centrifugal fan, so that the existing electric circular saw can be modified in a small way and the structure is compact and the implementation cost is low.

[0009] The electric circular saw with a dust removal mechanism provided by this utility model includes: an electric circular saw body, a drive motor installed on one side of the electric circular saw body, a saw blade installed on the output shaft of the drive motor, a main protective cover covering the outside of the saw blade, and a dust removal mechanism on the outside of the main protective cover.

[0010] The dust removal mechanism includes a centrifugal fan impeller, a guide shroud, and a connecting duct. The centrifugal fan impeller is equipped with an impeller locking component, which is connected to the output shaft. A guide shroud is provided on one side of the centrifugal fan impeller and is connected to the outer wall of the main protective cover. The guide shroud surrounds the centrifugal fan impeller. The connecting duct is located in the overlapping area of ​​the guide shroud and the main protective cover.

[0011] Preferably, a groove is provided on the outer wall of the main shield, and the connecting air duct is formed by the groove and the inner wall of the guide shroud.

[0012] Preferably, a dust discharge outlet is provided on the side wall of the air guide shroud, one end of which is connected to the centrifugal fan cavity, and the other end of which is connected to the outside air.

[0013] Preferably, the dust discharge outlet corresponds to the tangential direction of the outer edge of the centrifugal fan impeller.

[0014] Preferably, an air inlet is provided on the side wall of the air guide shroud, and the positions of the air inlet and the dust outlet are diagonally distributed.

[0015] Preferably, a dust guide hose is connected to the dust discharge outlet.

[0016] Preferably, the base plate of the electric circular saw has a dust suction port, and the dust suction port is connected to the air inlet via a dust suction pipe.

[0017] Preferably, the dust suction port is a narrow slit arranged along the cutting direction of the saw blade at the front of the base plate.

[0018] Compared with related technologies, the electric circular saw with a dust removal mechanism provided by this utility model has the following beneficial effects:

[0019] The front dust inlet and airflow path planning enable the dust generated during cutting to be captured and sucked away the instant it is generated, fundamentally solving the core pain point of obstructed vision of the cutting line and significantly improving cutting accuracy and operational safety.

[0020] The tangential dust discharge outlet and the sealed air duct formed by the main protective cover and the guide cover create an airflow channel with the least resistance and the highest efficiency, which substantially improves the dust removal efficiency.

[0021] By fully utilizing the existing structure of the electric circular saw for optimization and modification, the implementation cost is low and the degree of modification is small, achieving a comprehensive and excellent effect of compact structure, high dust removal efficiency, and controllable cost. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of an electric circular saw;

[0023] Figure 2This is a schematic diagram of the structure after the fairing has been removed;

[0024] Figure 3 This is a schematic diagram of the dust removal mechanism;

[0025] Figure 4 This is a schematic diagram of a centrifugal fan impeller located inside a guide shroud.

[0026] Reference numerals: 1. Circular saw body; 2. Drive motor; 3. Main guard; 31. Groove; 4. Dust removal mechanism; 41. Centrifugal fan impeller; 42. Air guide shroud; 421. Dust exhaust outlet; 422. Air inlet; 423. Dust guide hose; 43. Impeller locking component; 5. Suction port; 51. Suction pipe. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0028] Please see Figures 1 to 4 This utility model provides an electric circular saw with a dust removal mechanism 4. The electric circular saw is used for cutting operations. It has a base plate, which is the part of the electric circular saw that directly contacts the workpiece. Its main functions include support and stability, providing a wide and flat support surface for the entire electric circular saw, ensuring the saw body remains stable during cutting and does not wobble or tilt. The front edge of the base plate serves as a guide and reference point during cutting. During operation, this edge is pressed against a ruler or a line drawn on the workpiece to ensure the saw blade cuts in a straight line. The base plate is connected to the saw body via a hinge point and an adjustment mechanism. By loosening the depth adjustment lever, the saw body can be raised or lowered, thereby changing the depth to which the saw blade penetrates the workpiece. After adjustment, it is locked to ensure consistent cutting depths. The base plate can also be tilted relative to the saw body via the adjustment mechanism to achieve angled cuts.

[0029] The electric circular saw also includes an electric circular saw body 1. A drive motor 2 is installed on one side of the electric circular saw body 1. A saw blade is installed on the output shaft of the drive motor 2. The outer cover of the saw blade is provided with a main protective cover 3. The main protective cover 3 can prevent the operator from contacting the high-speed saw blade and block the high-speed flying debris.

[0030] A dust removal mechanism 4 is located on the outside of the main protective cover 3. The dust removal mechanism 4 includes a centrifugal fan impeller 41, and an impeller locking member 43 is integrally formed in the middle of the centrifugal fan impeller 41. The center of the impeller locking member 43 has an internal thread hole that matches the external thread of the output shaft end. During installation, the saw blade is first fitted onto the output shaft, with one side abutting against the shaft shoulder. Then, the impeller locking member 43 is screwed into the end of the output shaft and tightened with a wrench, thereby firmly pressing the saw blade onto the output shaft. At this time, the centrifugal fan impeller 41 is exposed outside the main protective cover 3.

[0031] It should be noted that, as another embodiment of the present invention, the impeller locking component 43 can also be composed of a separate locking nut and an independent centrifugal fan impeller 41, wherein the centrifugal fan impeller 41 is fixedly connected to the locking nut and rotates synchronously by means of spline, riveting or interference fit, thereby forming an integrated component in function.

[0032] The dust removal mechanism 4 also includes a flow guide shroud 42, which is installed on one side of the centrifugal fan impeller 41. The flow guide shroud 42 surrounds the centrifugal fan impeller 41, and the flow guide shroud 42 and the centrifugal fan impeller 41 form a centrifugal fan cavity. The flow guide shroud 42 is mainly used to wrap and guide the airflow generated by the centrifugal fan impeller 41.

[0033] More importantly, as another embodiment of the present invention, the air deflector 42 is preferably detachably fixed to the outside of the main shield 3 by screws, thereby forming a stable integrated structure. It is understood that the air deflector 42 may also be provided on the outside of the main shield 3 and surround the impeller via other support structures such as an independent connecting bracket, as long as it can perform the function of guiding airflow.

[0034] Please see Figure 2 and Figure 3The dust removal mechanism 4 also includes a connecting duct, located in the overlapping area of ​​the guide shroud 42 and the main shield 3. The connecting duct is formed by a groove 31 formed on the outer wall of the main shield 3 and the inner wall of the guide shroud 42 covering the groove 31. The connecting duct is a sealed channel that physically connects the bottom suction port 5 and the top centrifugal fan cavity. Without the connecting duct, the suction port 5 and the fan cavity are two independent, disconnected structures. Even if the impeller rotates at high speed and generates a large suction force, it cannot be effectively transmitted to the bottom suction port 5, and the entire system cannot form a negative pressure, making dust removal impossible. With the connecting duct, a complete and closed airflow loop is formed from the suction port 5 → connecting duct → fan cavity → dust outlet 421. Only in this way can the suction force generated by the impeller be precisely guided to the cutting source, like an invisible suction tube, drawing up dust and debris. In summary, when the centrifugal fan impeller 41 is working, it generates negative pressure, or suction, in its central area. The function of the connecting duct is to directly connect this high negative pressure area to the dust collection port 5, and to ensure that the loss of negative pressure during transmission is minimized by relying on its sealing properties.

[0035] By utilizing the combination of two existing components, the main shield 3 and the air guide 42, an air duct is formed between them. This integrated design avoids the use of additional connecting pipes, resulting in a more compact and reliable structure, reducing production and assembly costs, while ensuring a smooth inner wall of the channel, reducing airflow resistance, and improving dust removal efficiency.

[0036] Please see Figures 1 to 4 The side wall of the guide shroud 42 is provided with a dust discharge outlet 421. One end of the dust discharge outlet 421 is connected to the centrifugal fan cavity, and the other end of the dust discharge outlet 421 is connected to the outside air. Through this dust discharge outlet 421, it can be ensured that the dust collection system can continue to work, that is, the dust and debris sucked in are discharged, thereby avoiding the accumulation of dust and debris in the cavity and causing the system to fail.

[0037] It is worth noting that at this time, the dust is discharged directly from the dust outlet 421. In order to collect the discharged dust in a directional manner, a dust guide hose 423 is connected to the dust outlet 421. By installing the dust guide hose 423, the discharged dust can be collected. For example, the outlet end of the dust guide hose can be placed into the dust collection bucket to collect the dust, thereby avoiding the disadvantage of dust flying everywhere.

[0038] It should be noted that the dust outlet 421 corresponds to the tangential direction of the outer edge of the centrifugal fan impeller 41. This is primarily to achieve the highest efficiency in energy conversion and material transport. It ensures that the dust and airflow ejected by centrifugal force are smoothly discharged along the path of least resistance, rather than generating eddies or collisions within the cavity that lead to energy loss and dust accumulation. This directly relates to the efficiency and reliability of dust removal. Setting it in the tangential direction is to follow the laws of physics, allowing the airflow and dust to leave the system in the smoothest, least-resistance, and least-energy-loss manner, thereby maximizing dust removal efficiency.

[0039] according to Figure 4 An air inlet 422 is also provided on the side wall of the air guide shroud 42, and the air inlet 422 and the dust outlet 421 are diagonally distributed in space. If the distance between the dust outlet 421 and the air inlet 422 connecting to the air duct, i.e., the connection port with the fan cavity, is too close, it will seriously deteriorate the exhaust effect and even cause the system to fail. This layout ensures that the negative pressure of the airflow generated by the centrifugal fan impeller 41 can preferentially act on the dust suction port 5 on the base plate, thereby effectively preventing the airflow from short-circuiting inside the air guide shroud 42 and ensuring the efficiency of the entire dust removal system.

[0040] It is worth mentioning that the inlet connecting the air duct is preferably located at the bottom of the guide shroud 42 or on one side near the main shield 3, i.e., an axial inlet. The dust exhaust outlet 421 is located at the top or middle of the side wall of the guide shroud 42, i.e., a tangential outlet. This diagonal layout, one above and one below, one axial and one side, achieves maximum spatial separation between the two.

[0041] Please see Figure 3 and Figure 4 The base plate of the electric circular saw has a dust suction port 5. The dust suction port 5 is connected to the air inlet 422 by a dust suction pipe 51. The dust suction port 5 is a narrow slit arranged at the front of the base plate along the cutting direction of the saw blade.

[0042] It should be noted that the dust generated during the electric circular saw cutting can be sucked into the guide shroud 42 through the suction port 5 and the suction pipe 51. The power source of the entire dust removal system is the centrifugal fan impeller 41, which rotates at high speed synchronously with the saw blade, acting as a centrifugal fan. When the electric circular saw starts, the output shaft drives the impeller locking part 43 and the centrifugal fan impeller 41 to rotate at high speed together; thus generating negative pressure, or suction. When the impeller rotates, it strongly drives the air inside, causing the air to be thrown towards the cavity sidewall on the outer edge of the impeller under the action of centrifugal force. This process creates a low-pressure area, or negative pressure or vacuum suction, in the central area of ​​the impeller, i.e., the air inlet.

[0043] The suction force generated at the center of the fan cavity is transmitted without loss to the suction port 5 at the other end of the duct through the sealed connecting pipe. At this time, the air pressure at the suction port 5 is much lower than the outside atmospheric pressure. Under the action of atmospheric pressure, the air near the cutting point carries dust and is forced into the suction port 5, enters the connecting duct, and is then transported to the center of the impeller, and finally thrown out of the dust discharge port by the impeller.

[0044] It is worth noting that the entire dust removal mechanism 4 does not draw dust up by the suction port 5 itself. Instead, the centrifugal fan impeller 41 at the top of the system rotates to generate suction, which is then precisely delivered to the suction port 5 at the bottom through the connecting air duct.

[0045] More importantly, the suction port 5 is a narrow, elongated slit positioned at the front of the base plate along the saw blade's cutting direction. Its location directly opposite the cutting point allows for immediate dust removal, fundamentally ensuring a clear cutting view. Simultaneously, its elongated shape provides a continuous dust-collecting barrier along the entire cutting path of the saw blade, ensuring continuous dust removal and comprehensive coverage. Furthermore, at the same suction volume, this structure effectively increases the local airflow velocity at the suction port 5, thereby enhancing dust capture efficiency and preventing its diffusion. Additionally, this shape minimizes the reduction in rigidity and strength of the base plate, thus lowering the risk of blockage by foreign objects.

[0046] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0047] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. An electric circular saw with a dust removal mechanism (4), characterized in that, include: The electric circular saw body (1) has a drive motor (2) installed on one side of the electric circular saw body (1), and a saw blade is installed on the output shaft of the drive motor (2). The saw blade is covered with a main protective cover (3), and a dust removal mechanism (4) is located on the outside of the main protective cover (3). The dust removal mechanism (4) includes a centrifugal fan impeller (41), a guide shroud (42), and a connecting duct. The centrifugal fan impeller (41) is provided with an impeller locking member (43), which is connected to the output shaft. A guide shroud (42) is provided on one side of the centrifugal fan impeller (41). The guide shroud (42) is connected to the outer wall of the main protective cover (3). The guide shroud (42) surrounds the centrifugal fan impeller (41). The connecting duct is located in the overlapping area of ​​the guide shroud and the main protective cover (3).

2. The electric circular saw with a dust removal mechanism (4) according to claim 1, characterized in that, The outer wall of the main shield (3) is provided with a groove (31), and the connecting air duct is formed by the groove (31) and the inner wall of the guide shield.

3. The electric circular saw with a dust removal mechanism (4) according to claim 1, characterized in that, A dust discharge outlet (421) is provided on the side wall of the air guide shroud. One end of the dust discharge outlet (421) is connected to the centrifugal fan cavity, and the other end of the dust discharge outlet (421) is connected to the outside air.

4. An electric circular saw with a dust removal mechanism (4) according to claim 3, characterized in that, The dust outlet (421) corresponds to the tangential direction of the outer edge of the centrifugal fan impeller (41).

5. An electric circular saw with a dust removal mechanism (4) according to claim 3, characterized in that, An air inlet (422) is also provided on the side wall of the air guide shroud, and the air inlet (422) and the dust outlet (421) are diagonally distributed.

6. An electric circular saw with a dust removal mechanism (4) according to claim 3, characterized in that, A dust guide hose (423) is connected to the dust outlet (421).

7. An electric circular saw with a dust removal mechanism (4) according to claim 1, characterized in that, The base plate of the electric circular saw has a dust suction port (5), and the dust suction port (5) is connected to the air inlet (422) through a dust suction pipe (51).

8. An electric circular saw with a dust removal mechanism (4) according to claim 7, characterized in that, The dust suction port (5) is a narrow slit arranged along the cutting direction of the saw blade at the front of the base plate.

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