Power tool

Abstract

The utility model relates to an electric tool, include: casing, motor, accomodate in casing, and supply power via power cord, and pass through switch control start -stop, switch, control the start -stop of motor, and locate the rear end surface of casing, fan, set up in the front side of motor, and rotate by motor drive, air inlet, be located in the rear side of casing, exhaust port, be located in the front side of casing, the cooling airflow that fan rotation produces inhales from air inlet, flows through motor, and discharges from exhaust port, electric tool still include: filter mechanism, its cover air inlet, include first filter element and second filter element, the direction of first filter element unloading in casing and the direction of second filter element unloading in casing are angle setting, when second filter element installs in casing, at least part second filter element is located between power cord and switch.

Description

Technical Field

[0001] This utility model relates to an electric tool, and more particularly to an electric tool with a dust filter element. Background Technology

[0002] Power tools have a variety of uses, so they are widely used in production and daily life.

[0003] However, power tools often operate in environments with very high dust levels due to frequent grinding or drilling operations. This leads to two problems: firstly, dust can enter the motor housing through the tool's air intake, impacting the motor wiring and causing damage; secondly, dust can clog the inside of the tool housing, preventing the heat generated by the motor from dissipating properly and causing motor failure.

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

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide an electric tool with a dust filter element. This dust filter element can cover all the air intake ports on the electric tool housing, thereby preventing dust from entering the tool housing and effectively preventing motor damage caused by dust.

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

[0007] A power tool, comprising:

[0008] case;

[0009] An electric motor, which is housed in the housing and powered via a power cord;

[0010] A switch that controls the start and stop of the motor, and the switch is located on the rear end face of the housing;

[0011] A fan is located on the front side of the motor and is driven to rotate by the motor;

[0012] An air intake is located on the rear side of the housing;

[0013] The exhaust port is located on the front side of the housing. The cooling airflow generated by the fan rotation is drawn in from the air intake port, flows through the motor, and is discharged from the exhaust port.

[0014] The power tool also includes:

[0015] A filtering mechanism that covers the air intake, the filtering mechanism including a first filtering element and a second filtering element, wherein the direction in which the first filtering element is installed and removed from the housing and the direction in which the second filtering element is installed and removed from the housing are arranged at an angle;

[0016] When the second filter element is installed in the housing, at least a portion of the second filter element is located between the power line and the switch.

[0017] A further improvement is as follows: the housing includes a motor housing that houses the motor and a head cover and a tail cover connected to the front and rear sides of the motor housing, the air intake is located in the tail cover, and the exhaust port is located in the head cover;

[0018] The tail cover has a pair of spaced-apart first air vents and a second air vent located between the pair of first air vents. The air intake includes a first air intake penetrating through the first air vent and a second air intake penetrating through the second air vent. The extension directions of the first air intake and the second air intake are angled.

[0019] A further improvement is as follows: the first filter element includes a first frame, a first mounting port penetrating the first frame, and a first filter screen installed in the first mounting port. The inner wall of the first frame extends toward the first air window with a first mounting component, and the first mounting component is connected to the first air intake.

[0020] The second filter element includes a second frame, a second mounting port penetrating the second frame, and a second filter screen installed in the second mounting port. The inner wall of the second frame extends toward the second air window and has a second mounting assembly connected to the second air intake.

[0021] A further improvement is as follows: The first mounting component includes a pair of first claws extending from the upper side of the first frame toward the first air window and a pair of second claws extending from the lower side of the first frame toward the first air window. An insertion flange is provided between the pair of second claws. The first air intake forms a first engaging portion and a second engaging portion on the upper and lower sides of the first air window, respectively. The first claws are connected to the first engaging portion, and the second claws and the insertion flange are connected to the second engaging portion.

[0022] The second mounting component includes a pair of third claws extending from the upper side of the second frame toward the second air window and a pair of fourth claws extending from the lower side of the first frame toward the second air window. The second air intake is provided with a third engagement portion and a fourth engagement portion on the upper and lower sides of the second air window, respectively. The third claws are connected to the third engagement portion, and the fourth claws are connected to the fourth engagement portion.

[0023] A further improvement is as follows: the second vent has a switch mounting hole and a wire passage on its upper and lower sides, the switch extends from the switch mounting hole to the outside of the tail cover, and the power cord is connected to the motor via the wire passage.

[0024] A further improvement is that the switch mounting hole is at least partially located between a pair of the third engaging portions, and the fourth engaging portion is located on both sides of the wire passing portion.

[0025] A further improvement is as follows: the upper and lower sides of the second frame are respectively provided with a first clearance portion located between a pair of third engagement portions and a second clearance portion located between a pair of fourth engagement portions. The first clearance portion fits against the outside of the switch mounting hole, and the second clearance portion fits against the outside of the wire passage portion.

[0026] A further improvement is to provide a screw fastening hole between the switch mounting hole and the wire guide portion, and to cover the screw fastening hole with the second filter element.

[0027] A further improvement is that at least a portion of the first mounting port corresponds to the first air intake port in the radial direction of the tail cover, and at least a portion of the second mounting port corresponds to the second air intake port in the axial direction of the tail cover.

[0028] A further improvement is that the direction in which the first filter element is installed and removed from the tail cover and the direction in which the second filter element is installed and removed from the tail cover are perpendicular to each other.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. A first filter element and a second filter element are respectively installed at the first air intake and the second air intake of the power tool, which can effectively prevent dust or metal debris from entering the housing of the power tool, thereby effectively preventing motor damage caused by dust or metal debris.

[0031] 2. When the second filter element is installed in the second vent, the first and second clearance parts on the upper and lower sides of the second filter element are respectively attached to the outside of the switch mounting hole and the wire passage, so that the switch and power line can be smoothly passed through the switch mounting hole and the wiring passage. The second filter element can achieve the dustproof function while ensuring that it does not interfere with the switch and power line. The structure is ingenious and can improve the compactness of the tail cover size.

[0032] 3. The first mounting port of the first filter element is at least partially located in the radial direction of the tail cover and corresponds to the first air intake port. The second mounting port of the second filter element is at least partially located in the axial direction of the tail cover and corresponds to the second air intake port. This achieves the dustproof function while also ensuring the intake volume of cooling gas, which is beneficial for the dissipation of motor heat. Attached Figure Description

[0033] Figure 1 This is a perspective view of the power tools in the embodiments of this utility model;

[0034] Figure 2 yes Figure 1 The diagram shows the structure of the tail cover in the power tool.

[0035] Figure 3 yes Figure 2 An exploded view of the tail cover shown.

[0036] Figure 4 yes Figure 3 The diagram shows the structure of the second filter element in the tail cover. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0038] 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.

[0039] Please refer to Figure 1 and Figure 2 This utility model relates to an electric tool 100 for grinding metal and wood. Preferably, this electric tool 100 is an angle grinder 100. In this embodiment, the angle grinder 100 has an elongated housing 1, within which a motor (not shown) for driving the angle grinder 100 is housed. Optionally, the front end of the motor can transmit power to the spindle (not shown) via an angular transmission gear system (not shown), thereby driving the disc cutter 2 at the end of the spindle to rotate. To prevent accidental injury to the user from the disc cutter 2 while operating the angle grinder 100, a protective cover 3 can be placed outside the disc cutter 2, thus covering the blade facing the user.

[0040] To provide a more detailed description of the structure of the angle grinder 100, the extension direction of the housing 1 is defined as the front-to-back direction, and the direction perpendicular to the disc cutter 2 is defined as the up-down direction. Therefore, the direction transverse to the housing 1 and parallel to the disc cutter 2 is the left-to-right direction. In the front-to-back direction, the housing 1 of the angle grinder 100 can be sequentially divided into a head housing 11, a motor housing 12, and a tail cover 13. The motor housing 12 is located between the head housing 11 and the tail cover 13. The head housing 11 is located in front of the motor housing 12, and the tail cover 13 is connected to the rear of the motor housing 12. The aforementioned motor is located inside the motor housing 12. At the same time, the angular transmission gear system and the output shaft are located inside the head housing 11, and the disc cutter 2 and the protective cover 3 are located below the head housing.

[0041] In this embodiment, the motor is connected to the power supply via power line 4. The motor can operate after being powered on. Optionally, the motor can be a brushless motor driven by an inverter circuit or a series-wound motor with carbon brushes. The power supply to the motor is controlled by switch 5, which is located on the rear end face of the tail cover 13. The user can start and stop the motor by moving the switch 5 left and right.

[0042] Furthermore, the safety of the motor is crucial for the angle grinder 100. The greatest threat to the motor during operation comes from the dust and iron filings generated by the disc cutter 2. If these dust and iron filings enter the motor housing 12, the motor's wires will be impacted or cut and damaged, causing the motor to malfunction. In addition, if dust and iron filings accumulate to a certain amount inside the housing 1, the heat generated by the motor's rotation cannot dissipate from the housing 1, and the motor will inevitably burn out due to prolonged high-temperature operation.

[0043] Therefore, in this embodiment, a filter mechanism 6 is provided on the tail cover 13 to solve the above-mentioned problems. The structure of the tail cover 13 will be described next; please refer to [reference needed]. Figures 2 to 3 As shown, specifically, a pair of first air vents 131 are provided on the left and right sides of the tail cover 13, and a second air vent 132 is formed on the rear end face of the tail cover 13. The line connecting the first air vents 131 is parallel to the second air vent 132, or in other words, the second air vent 132 is located between the pair of first air vents 131 in the left and right opposite directions.

[0044] The first air vent 131 has several through-holes 131a, which form a long strip from front to back. These strips are arranged in several rows in the vertical direction, and the opening areas of the first air vents 131a on the first air vent 131 are all equal. Similarly, the second air vent 132 has several through-holes 132a, which form discontinuous strips in the horizontal direction. These discontinuous strips are arranged in several rows in the vertical direction. The discontinuous areas formed by the second air vents 132a in the horizontal direction are defined as discontinuous sections 132b. Please refer to... Figure 3 A through screw fastening hole 133 is provided at the middle position of the disconnected part 132b in the vertical direction. The vertical drop of the screw fastening hole 133 is small, only slightly larger than the maximum opening size of the second air intake 132a.

[0045] Furthermore, a switch mounting hole 134 and a wire passage portion 135 are respectively provided on the upper and lower sides of the screw fastening hole 133. The switch mounting hole 134 is circular, and its diameter is larger than that of the screw fastening hole 133. A portion of the lower end of the switch mounting hole 133 is located within the disconnection portion 132b, thereby reducing the vertical dimension of the second vent 132. Correspondingly, the switch 5 extends rearward from the inside of the tail cover 13, passes through the switch mounting hole 134, and protrudes from within the switch mounting hole 134.

[0046] Please continue reading. Figure 3 The upper half of the wire-passing portion 135 is located within the disconnection portion 132b. This arrangement also reduces the vertical dimensions of the second air window 132. The wire-passing portion 135 is approximately circular, extending from the end face of the second air window 132 away from the second air window 132. A wire-passing hole is provided inside, the diameter of which is larger than that of the switch mounting hole 134. This is because the power cord 4 is relatively thick; if the wire-passing hole were smaller, the power cord would not be able to pass through. In other words, it is precisely because the size of the wire-passing portion 135 is relatively large that the opening area of ​​the lower second air intake 132a is relatively small.

[0047] If the angle grinder 100 is started without the filter element 6 installed, the fan at the front of the motor will draw cooling airflow from the first intake port 131a and the second intake port 132a. This cooling airflow will then flow through the motor, carrying away the air generated during operation, and finally exit from the exhaust port 111 on the front side of the head shell 11. However, during this process, dust and metal shavings generated by the grinding of the disc cutter 2 will also be drawn into the first intake port 131a and the second intake port 132a, thus putting the motor in a dangerous condition.

[0048] Please refer to Figures 1 to 4As shown, the filter mechanism 6 will now be introduced. The filter mechanism 6 is a three-piece combination mechanism, including a pair of first filter elements 61 connected to the first air window 131 and a second filter element 62 connected to the second air window 132. The loading and unloading directions of the first filter element 61 and the second filter element 62 are set at an angle, or more specifically, the loading and unloading directions of the first filter element 61 and the second filter element 62 are basically perpendicular.

[0049] Further, turn to Figures 2 to 4 The first filter element 61 includes a first frame 611, a first mounting port 612 penetrating the first frame 611, and a first filter screen (not shown) installed in the first mounting port 612. A first mounting assembly 613 extends from the inner wall of the first frame 611 toward the first air window 131 and is connected to the first air intake 131a. The first frame 611 is formed into a generally hollow rectangular shape covering the outside of the first air window 131. It is divided into several first mounting ports 612 by crisscrossing ribs inside. The first filter screen in the first mounting port 612 is a metal filter screen. The metal filter screen has numerous ventilation holes formed by numerous interwoven metal wires. The diameter of these ventilation holes should be much smaller than the opening size of the first air intake 131a, or in other words, the diameter of these ventilation holes should be smaller than the size of most dust or iron filings, so as to ensure that dust or iron filings can be isolated outside the housing 1.

[0050] The installation of the first filter element 61 will be described next, starting from... Figure 3 Several rows of elongated first air intakes 131a can be seen. In this embodiment, the uppermost and lowermost elongated air intakes are selected as the first engaging portion 131b and the second engaging portion 131c, respectively, to receive the first mounting assembly 613 of the first filter element 61. Optionally, the first mounting assembly 613 includes a pair of first claws 613a extending from the upper side of the first frame 611 toward the first air window 131, a pair of second claws 613b extending from the lower side of the first frame 611 toward the first air window 131, and an insertion flange 613c formed between the pair of second claws 613b. Of course, the first mounting assembly 613 may also only have the first claws 613a and the second claws 613b. In the installed state, the first claw 613a is connected to the first engaging part 131b, and the second claw 6113b and the insert flange 613c are connected to the second engaging part 131c. The purpose of the insert flange 613c is to make the first filter element 61 more securely connected to the first air intake 131a, so as to prevent the first filter element 61 from falling off the tail cover due to vibration during the use of the angle grinder 100.

[0051] Please continue reading. Figures 2 to 4The second filter element 62 includes a second frame 621, a second mounting port 622 penetrating the second frame 621, and a second filter screen (not shown) installed within the second mounting port 622. A second mounting assembly 623 extends from the inner wall of the second frame 621 toward the second air vent 132 and is connected to the second air intake 132a. The second frame 621 is an irregular, approximately rectangular shape with a smaller area than the first frame 611. Due to the limited area of ​​the second frame 621 and the presence of a first clearance portion 621a and a second clearance portion 621b on its upper and lower sides, only two rows of second mounting ports 622 are formed. Furthermore, the structure of the second filter screen is consistent with that of the first filter screen, and will not be described further here.

[0052] The installation of the second filter 62 will be described next. The second mounting assembly 623 includes a pair of third claws 623a extending from the upper side of the second frame 621 toward the second air window 132 and a pair of fourth claws 623b extending from the lower side of the first frame 621 toward the second air window 132. The second air intake 132a is provided with a third engaging portion 132c and a fourth engaging portion 132d on the upper and lower sides of the second air window 132, respectively. The first clearance portion 621a is located between the pair of third claws 623a, and the second clearance portion 621b is located between the pair of fourth claws 623b.

[0053] In the installed state, the third claw 623a is connected to the third engaging portion 132c, and the fourth claw 623b is connected to the fourth engaging portion 132d. Simultaneously, after the second filter element 62 is installed, the first clearance portion 621a fits against the outside of the switch mounting hole 134, and the second clearance portion 621b fits against the outside of the wire passage portion 135. That is, at least a portion of the second filter element 62 is located between the power cord 4 and the switch 5. Furthermore, the screw fastening hole 133 is also covered by the second filter element 62 at this time. The arrangement of the first clearance portion 621a and the second clearance portion 621b avoids interference between the second filter element 62 and the switch 5 and the power cord 4, while also achieving a compact structure for the second vent 132.

[0054] In addition, in this embodiment, the first mounting port 612 of the first filter element 61 is at least partially located in the radial direction of the tail cover 13 and corresponds to the first air intake port 131a, and the second mounting port 622 of the second filter element 62 is at least partially located in the axial direction of the tail cover 13 and corresponds to the second air intake port 132a. This achieves the dustproof function while also ensuring the intake volume of cooling gas, which is beneficial for motor heat dissipation.

[0055] Those skilled in the art will readily understand that many other alternatives to the power tools of this invention exist without departing from the principles and scope of this invention. The scope of protection of this invention is determined by the claims.

Claims

1. An electric tool, comprising: case; An electric motor, which is housed in the housing and powered via a power cord; A switch that controls the start and stop of the motor, and the switch is located on the rear end face of the housing; A fan is located on the front side of the motor and is driven to rotate by the motor; An air intake is located on the rear side of the housing; The exhaust port is located on the front side of the housing. The cooling airflow generated by the fan rotation is drawn in from the air intake port, flows through the motor, and is discharged from the exhaust port. The power tool is characterized in that it further includes: A filtering mechanism that covers the air intake, the filtering mechanism including a first filtering element and a second filtering element, wherein the direction in which the first filtering element is installed and removed from the housing and the direction in which the second filtering element is installed and removed from the housing are arranged at an angle; When the second filter element is installed in the housing, at least a portion of the second filter element is located between the power line and the switch.

2. The power tool according to claim 1, characterized in that: The housing includes a motor housing that houses the motor and a head cover and a tail cover connected to the front and rear sides of the motor housing. The air intake is located in the tail cover, and the exhaust port is located in the head cover. The tail cover has a pair of spaced-apart first air vents and a second air vent located between the pair of first air vents. The air intake includes a first air intake penetrating through the first air vent and a second air intake penetrating through the second air vent. The extension directions of the first air intake and the second air intake are angled.

3. The power tool according to claim 2, characterized in that: The first filter element includes a first frame, a first mounting port penetrating the first frame, and a first filter screen installed in the first mounting port. The inner wall of the first frame extends toward the first air window with a first mounting component, and the first mounting component is connected to the first air intake. The second filter element includes a second frame, a second mounting port penetrating the second frame, and a second filter screen installed in the second mounting port. The inner wall of the second frame extends toward the second air window and has a second mounting assembly connected to the second air intake.

4. The power tool according to claim 3, characterized in that: The first mounting assembly includes a pair of first claws extending from the upper side of the first frame toward the first air window and a pair of second claws extending from the lower side of the first frame toward the first air window. An insertion flange is provided between the pair of second claws. The first air intake forms a first engagement portion and a second engagement portion on the upper and lower sides of the first air window, respectively. The first claws are connected to the first engagement portion, and the second claws and the insertion flange are connected to the second engagement portion. The second mounting component includes a pair of third claws extending from the upper side of the second frame toward the second air window and a pair of fourth claws extending from the lower side of the first frame toward the second air window. The second air intake is provided with a third engagement portion and a fourth engagement portion on the upper and lower sides of the second air window, respectively. The third claws are connected to the third engagement portion, and the fourth claws are connected to the fourth engagement portion.

5. The power tool according to claim 4, characterized in that: The second vent has a switch mounting hole and a wire passage on its upper and lower sides. The switch extends from the switch mounting hole to the outside of the tail cover, and the power cord is connected to the motor via the wire passage.

6. The power tool according to claim 5, characterized in that: The switch mounting hole is at least partially located between a pair of the third engaging portions, and the fourth engaging portion is located on both sides of the wire guide portion.

7. The power tool according to claim 5, characterized in that: The second frame has a first clearance portion located between a pair of third claws and a second clearance portion located between a pair of fourth claws on its upper and lower sides, respectively. The first clearance portion fits against the outside of the switch mounting hole, and the second clearance portion fits against the outside of the wire guide portion.

8. The power tool according to claim 5, characterized in that: A screw fastening hole is provided between the switch mounting hole and the wire guide portion, and the second filter element covers the screw fastening hole.

9. The power tool according to claim 3, characterized in that: At least a portion of the first mounting port corresponds to the first air intake in the radial direction of the tail cover, and at least a portion of the second mounting port corresponds to the second air intake in the axial direction of the tail cover.

10. The power tool according to claim 3, characterized in that: The direction in which the first filter element is installed and removed from the tail cover is perpendicular to the direction in which the second filter element is installed and removed from the tail cover.

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