CN114986346A

CN114986346A - Control system and electric tool

Info

Publication number: CN114986346A
Application number: CN202210447599.8A
Authority: CN
Inventors: 陈晨; 袁卫卫; 彭宇
Original assignee: Nantong Chuangming Electric Tool Co ltd
Current assignee: Nantong Chuangming Electric Tool Co ltd
Priority date: 2022-04-26
Filing date: 2022-04-26
Publication date: 2022-09-02

Abstract

The embodiment of the application provides a control system and electric tool belongs to electrical apparatus heat dissipation technical field, and control system includes control box, the device that generates heat, radiator unit, insulating filler and main control board. The control box has and holds the chamber and with hold the heat dissipation wind gap of chamber intercommunication. The heating device is positioned in the accommodating cavity. The heat dissipation assembly is connected with the heating device and penetrates through the heat dissipation air opening so that the heat dissipation assembly is partially located outside the accommodating cavity. The insulating filler is positioned in the accommodating cavity so that the heating device is isolated from one side of the heat dissipation air opening deviating from the accommodating cavity. The main control board is connected with the heating device. The control system and the electric tool of the embodiment of the application can reduce the possibility that the circuit is damaged and can improve the heat dissipation efficiency.

Description

Control system and electric tool

Technical Field

The application relates to the technical field of heat dissipation of electrical appliances, in particular to a control system and an electric tool.

Background

In the related art, for example, an angle grinder, a circuit may be damaged or heat dissipation may be difficult during operation of the power tool.

Disclosure of Invention

In view of the above, it is desirable to provide a control system and an electric power tool, which can reduce the possibility of circuit damage and improve the heat dissipation efficiency.

In order to achieve the above object, a first aspect of embodiments of the present application provides a control system, including:

the control box is provided with an accommodating cavity and a heat dissipation air port communicated with the accommodating cavity;

the heating device is positioned in the accommodating cavity;

the heat dissipation assembly is connected with the heating device and penetrates through the heat dissipation air opening so as to enable the heat dissipation assembly to be partially positioned outside the accommodating cavity;

the insulating filler is positioned in the accommodating cavity so as to isolate the heating device from one side of the heat dissipation air opening, which deviates from the accommodating cavity; and

and the main control panel is connected with the heating device.

In one embodiment, the heat dissipation assembly comprises:

a circuit layer at least partially connected with the heat generating device;

the insulating layer is at least partially positioned on one side of the circuit layer, which is far away from the heat generating device, and the circuit layer is arranged on the insulating layer; and

the heat radiator is arranged on one side, deviating from the heating device, of the insulating layer, the insulating layer can transfer heat emitted by the heating device to the heat radiator, and the heat radiator is at least partially located on one side, deviating from the accommodating cavity, of the heat radiation air opening.

In one embodiment, the heat sink includes:

the heat conducting substrate is arranged on one side, away from the heating device, of the insulating layer, and the insulating layer can transfer heat emitted by the heating device to the heat conducting substrate; and

the radiator body is detachably connected to one side, deviating from the insulating layer, of the heat conducting substrate, and the radiator body is at least partially located on one side, deviating from the accommodating cavity, of the heat radiating air opening.

In one embodiment, the heat conducting substrate is located in the accommodating cavity, a gap extending along the circumferential direction of the heat conducting substrate is enclosed by the heat conducting substrate and the control box, and the insulating filler is at least partially filled in the gap so as to isolate the heating device from one side of the heat dissipation air opening, which is away from the accommodating cavity.

In one embodiment, the circuit layer, the insulating layer and the heat conducting substrate are sequentially connected.

In one embodiment, the heat generating device is in surface contact with the heat dissipating assembly.

In one embodiment, the heat generating device is a chopper switch of a chopper circuit.

In one embodiment, the insulating filler is capable of solidifying from a liquid state to a solid state at room temperature.

In one embodiment, the main control board is located hold the intracavity, the main control board and the one side that the heat dissipation wind gap deviates from hold the chamber is through insulating filler keeps apart.

A second aspect of embodiments of the present application provides an electric power tool including:

the shell is provided with an electric control area, and an air inlet and an air outlet which are communicated with the electric control area;

the control system corresponding to the control system is positioned in the electric control area;

the wind wheel is positioned in the shell; and

the main machine is used for driving the wind wheel to rotate so that airflow flows through the air inlet, the heat dissipation assembly and the air outlet in sequence.

In one embodiment, the host has a working portion, and the heat dissipation air opening is located on one side of the accommodating cavity facing the working portion along the arrangement direction of the accommodating cavity and the heat dissipation air opening.

In one embodiment, the housing further forms a mounting cavity and a transition air opening respectively communicating the mounting cavity and the electric control area, the wind wheel is located in the mounting cavity, the transition air opening is located between the electric control area and the mounting cavity and along the arrangement direction of the accommodating cavity and the heat dissipation air openings, the transition air opening is located on one side of the accommodating cavity facing the heat dissipation air opening, and when the wind wheel rotates, the airflow sequentially flows through the air inlet, the heat dissipation assembly, the transition air opening, the mounting cavity and the air outlet.

In one embodiment, the control system further comprises an operating mechanism, the operating mechanism penetrates through the housing and is connected with the main control board, and the operating mechanism is located on one side, away from the heat dissipation air opening, of the control box.

In one embodiment, the main control board is located in the accommodating cavity, and the main control board and one side of the heat dissipation air opening, which is far away from the accommodating cavity, are isolated by the insulating filler; the control system further comprises a first electrolytic capacitor connected with the main control board, the first electrolytic capacitor is used for inhibiting a current peak value of an output side of the rectifying circuit of the main control board, the first electrolytic capacitor penetrates through the heat dissipation air opening to enable the first electrolytic capacitor to be partially located on one side, deviating from the accommodating cavity, of the heat dissipation air opening, the first electrolytic capacitor is cylindrical, the axial span of the first electrolytic capacitor is larger than the radial span of the first electrolytic capacitor, and the axial direction of the first electrolytic capacitor is parallel to the main control board.

The control system of this application embodiment, on the one hand, the air current flows through radiator unit and takes away the heat that generates heat the device and conduct to radiator unit to better dispel the heat to the device that generates heat, improve the radiating efficiency. On the other hand, because the insulating filler that is located and holds the intracavity makes heating device and heat dissipation wind gap deviate from the one side isolation that holds the chamber, and heating device is packed to be separated and is holding the intracavity by the filler, even if there is dust, moisture and electrically conductive piece in the air current of the radiator unit of scattered hot wind department of flowing through, these dust, moisture and electrically conductive piece also can't see through the insulating filler contact heating device who holds the intracavity, have reduced the impaired possibility of circuit. Therefore, the control system of the embodiment of the application can reduce the possibility of damaging the circuit and improve the heat dissipation efficiency.

Drawings

Fig. 1 is a schematic structural view of a power tool according to an embodiment of the present application, showing an internal structure of the power tool;

fig. 2 is a perspective view of a power tool according to an embodiment of the present application;

FIG. 3 is an exploded view of the control system of an embodiment of the present application showing a heat sink assembly and a heat generating device;

FIG. 4 is an assembly view of the heat generating device and the heat dissipating assembly of the embodiment of the present application, showing the heat dissipating assembly facing the side of the heat generating device, without showing the heat sink body;

fig. 5 is an exploded view of the control system according to the embodiment of the present application, in which the heat dissipation assembly and the heat generating device are not shown, and the first electrolytic capacitor is shown in a state of being detached from the main control board;

fig. 6 is a schematic structural diagram of a control system according to an embodiment of the present application, in which a heat dissipation assembly and a heat generating device are not shown;

fig. 7 is a schematic structural diagram of a control system according to an embodiment of the present application, showing a side of the control box facing the heat dissipation air opening.

FIG. 8 is a schematic view of the cross-sectional view of FIG. 7 taken at location B-B rotated 90 degrees clockwise, with the insulating and circuit layers not shown;

FIG. 9 is a schematic view of the C-direction view of FIG. 8 rotated 90 degrees clockwise;

FIG. 10 is an enlarged view of FIG. 8 at position D;

fig. 11 is an assembly view of the control box and the heat conducting substrate according to the embodiment of the present application, in which the resin is encapsulated in the accommodating chamber, and the heat sink body, the circuit layer, the insulating layer, and the heat generating device in the accommodating chamber are not shown;

FIG. 12 is a view taken along line A of FIG. 1, showing the tailcap;

fig. 13 is a circuit diagram of a power tool according to an embodiment of the present application, showing a power source regulating portion of the circuit diagram.

Description of the reference numerals: a control system 100; a control box 1; a housing chamber 11; a heat dissipation air port 12; a heat generating device 2; a heat sink assembly 3; a heat sink 33; a heat conductive substrate 331; a reference surface 3311; a heat sink body 332; an insulating filler 4; a packing surface 41; a main control board 5; a rectifier circuit 501; a chopper circuit 502; a gap 6; the first operating mechanism 71; a second operating mechanism 72; a first electrolytic capacitor 8; a mounting substrate 9; a wind deflector 10; a housing 200; an electric control area 201; an air inlet 202; a mounting cavity 204; a transition tuyere 205; a housing 206; a tail cap 207; a wind wheel 300; a motor 401; a transmission member 402; a grinding wheel 403; a working portion 404.

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

Before describing the embodiments of the present application, it is necessary to analyze the reasons that the electric tool may have circuit damage or heat dissipation difficulty in the related art, and obtain the technical solution of the embodiments of the present application through reasonable analysis.

In the related art, the heat generating device of the power tool needs to dissipate heat, and air outside the power tool flows through the vicinity of the heat generating device through the wind wheel to dissipate the heat, but dust, moisture and even conductive debris possibly contained in the outside air may enter the power tool along with the outside air and flow through the vicinity of the heat generating device, for example, when the electric power tool is used as an angle grinder, the angle grinder grinds the conductive debris generated by metal materials. When the heat-generating device is exposed out of the insulating filler, although the heat-generating device can be well radiated by the airflow flowing through the vicinity of the heat-generating device, the circuit connected with the heat-generating device may be damaged by dust, moisture and even conductive debris in the airflow, and particularly, the circuit connected with the heat-generating device may be seriously damaged by the short circuit caused by the conductive debris and the moisture. When the device that generates heat keeps apart with being used for radiating air current through insulating filler, though reduced dust, moisture in the air current and electrically conductive piece etc. to the circuit damage's that connects the device that generates heat possibility, however, because some insulating filler's thermal conductivity is relatively poor, the device heat dissipation difficulty that generates heat of being sealed in insulating filler, the heat that is difficult to in time will send is discharged, probably causes the device that generates heat overheated. In the case of the angle grinder, the external power supply of the angle grinder is ac power, for example, ac power of 220V and 50HZ, but the angle grinder is not directly driven by the external power supply, and the motor of the angle grinder may be a dc motor, and the ac power of 220V and 50HZ of the external power supply needs to be converted into dc power by a control system of the angle grinder to drive the angle grinder to operate. For example, the angle grinder is externally connected with 220V and 50HZ power supplies, 220V and 50HZ alternating currents are converted into direct currents through the rectifying circuit 501, the direct currents are chopped by the chopper circuit 502 to form U-phase, V-phase and W-phase power supplies to the direct current motor, and chopper switches in the chopper circuit 502 emit a large amount of heat outwards in the working process, so that the chopper switches in the chopper circuit 502 need to be radiated, but exposed chopper switches may be affected by dust, moisture and conductive debris in air flow to cause damage to circuits connected with the chopper switches.

In view of this, the present embodiment provides a power tool, referring to fig. 1 and fig. 2, the power tool includes a housing 200, a control system 100, a wind wheel 300, and a main machine. The housing 200 is formed with an electric control area 201, and an air inlet 202 and an air outlet which are communicated with the electric control area 201. Control system 100 is located within electrical control area 201. The wind wheel 300 is located within the housing. The main machine is used for driving the wind wheel 300 to rotate so that the airflow flows through the air inlet 202, the control system 100 and the air outlet in sequence. Thus, the control system 100 can emit heat during the operation of controlling the power tool, the main machine drives the wind wheel 300 to rotate, and the rotating wind wheel 300 enables air outside the housing to enter the housing and flow through the control system 100 to dissipate heat of the control system 100.

In one embodiment, the power tool may be an angle grinder.

It is understood that the power tool may be other than an angle grinder.

Referring to fig. 1, 3, 4, 7 and 8, the control system 100 of the embodiment of the present application includes a heating device 2 and a main control board 5, and the main control board 5 is connected to the heating device 2. In this way, the heat generating devices 2 are connected to corresponding circuits in the main control board 5, and the heat generating devices 2 generate heat during the operation of the corresponding circuits.

In an embodiment, referring to fig. 3, 4, 7, 9, 10 and 11, the control system 100 further includes a control box 1, a heat dissipation assembly 3 and an insulating filler 4. The control box 1 has a containing cavity 11 and a heat dissipation air opening 12 communicated with the containing cavity 11. The heat generating device 2 is located in the accommodating chamber 11. The heat dissipation assembly 3 is connected with the heating device 2, and the heat dissipation assembly 3 penetrates through the heat dissipation air opening 12 so that the heat dissipation assembly 3 is partially located outside the accommodating cavity 11. The insulating filler 4 is located in the accommodating cavity 11 to isolate the heating device 2 from one side of the heat dissipation air opening 12 departing from the accommodating cavity 11. With the structure, on the one hand, the airflow flows through the heat dissipation assembly 3 to take away the heat conducted from the heating device 2 to the heat dissipation assembly 3, so that the heat dissipation of the heating device 2 is better, and the heat dissipation efficiency is improved. On the other hand, because the insulating filler 4 that is located and holds the chamber 11 makes heating device 2 and heat dissipation wind gap 12 deviate from the one side isolation that holds the chamber 11, heating device 2 is packed to be separated in holding the chamber 11 by the filler, even if there is dust, moisture and electrically conductive debris in the air current of the radiator unit 3 of heat dissipation wind gap 12 department of flowing through, these dust, moisture and electrically conductive debris also can't see through the insulating filler 4 contact heating device 2 that holds in the chamber 11, have reduced the impaired possibility of circuit. Therefore, the control system 100 of the embodiment of the present application can reduce the possibility of the circuit being damaged, and can improve the heat dissipation efficiency, which is beneficial for the control system 100 and the electric tool to work better.

In one embodiment, the control box 1 is made of an insulating material. Illustratively, the material of the control box 1 is plastic.

In one embodiment, referring to fig. 1, the main body is used for driving the wind wheel 300 to rotate so that the airflow sequentially flows through the air inlet 202, the heat dissipation assembly 3 and the air outlet. Therefore, when the main machine drives the wind wheel 300 to rotate, the rotating wind wheel 300 enables air outside the casing to enter the electric control area 201 through the air inlet 202, air flow entering the electric control area 201 flows through the heat dissipation assembly 3 to dissipate heat of the heat dissipation assembly 3 under the action of the fan, and the air flow flows out of the casing from the air outlet after flowing through the heat dissipation assembly 3, so that the air flow continuously flows through the heat dissipation assembly 3 in the casing, and the heat dissipation assembly 3 is dissipated.

In one embodiment, referring to fig. 1, the air outlet is located on the leeward side of the wind wheel 300 along the axial direction of the wind wheel 300. Thus, the air flow in the housing is facilitated to flow out of the housing from the air outlet under the action of the wind wheel 300.

In one embodiment, referring to fig. 2, at least one side of the housing 200 along the predetermined direction is provided with an air inlet 202.

In one embodiment, referring to fig. 2, the housing 200 has air inlets 202 disposed at two opposite sides along a predetermined direction.

In an embodiment, referring to fig. 1, fig. 2, fig. 8 and fig. 11, the predetermined direction is crosswise arranged in the arrangement direction of the accommodating cavity 11 and the heat dissipation air opening 12.

In one embodiment, the predetermined direction is perpendicular to the arrangement direction of the accommodating cavity 11 and the heat dissipation air opening 12.

In one embodiment, referring to fig. 13, the heat generating device 2 may be a chopper switch of the chopper circuit 502.

In one embodiment, referring to fig. 13, the number of chopping switches in the chopper circuit 502 is multiple.

In one embodiment, referring to fig. 13, the number of chopping switches in the chopper circuit 502 is 6.

In one embodiment, the chopping switches are power devices.

In one embodiment, the power device as the chopper switch may be an Insulated Gate Bipolar Transistor (IGBT).

In one embodiment, the power device as the chopping switch may be a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET).

It can be understood that, besides the connection of the heat generating device 2 with the main control board 5, other terminals of the heat generating device 2 may be connected to each other through a circuit, so that the main control board 5, the heat generating device 2 and the circuit layer form a relatively complete control loop. For example, in the circuit structure, it may be necessary to connect the collector terminals of a plurality of IGBTs in common, or it may be necessary to connect the drain terminals of a plurality of IGBTs in common.

In one embodiment, the heat dissipation assembly 3 includes a circuit layer, an insulating layer, and a heat sink 33. The circuit layer is at least partially connected with the heat generating device 2. The insulating layer is at least partially located on one side of the circuit layer, which faces away from the heating device 2, and the circuit layer is arranged on the insulating layer. Radiator 33 sets up in the insulating layer and deviates from one side of heating device 2, and the insulating layer can be with the heat transfer to radiator 33 that heating device 2 gived off, and radiator 33 is located the one side that cooling wind gap 12 deviates from holding chamber 11 at least partially. In this structure, since the circuit layer is at least partially connected to the heat generating device 2, the terminals of the heat generating device 2 that need to be connected to each other can be connected to the circuit layer of the heat dissipating module 3. The heat sink 33 is mostly made of a metal material, the heat sink 33 has a certain conductive capability, the heat sink 33 is disposed on a side of the insulating layer away from the heat generating device 2, so that the insulating layer insulates the heat sink 33 from the circuit layer, and the insulating layer insulates the heat sink 33 from the heat generating device 2, thereby preventing terminals of the heat generating device 2 from being unnecessarily conducted with the heat sink 33 and preventing the circuit layer from being unnecessarily conducted with the heat sink 33 to some extent. The heat generated by the heat generating device 2 is transferred to the heat sink 33 through the insulating layer, and the heat generating device 2 is cooled by air through the heat sink 33.

It is understood that the insulating layer can transfer the heat emitted from the heat generating device 2 to the heat sink 33, has a good heat conducting capability, and can be made of materials known in the art.

In one embodiment, the insulating layer has a plate-like structure.

In one embodiment, the phase state of the insulating layer at room temperature is solid.

In one embodiment, the insulating layer may be made of silicone grease.

In an embodiment, referring to fig. 3, 4, 7 and 8, the heat sink 33 includes a heat conductive substrate 331 and a heat sink body 332. The heat conducting substrate 331 is disposed on one side of the insulating layer departing from the heating device 2, and the insulating layer can transfer heat emitted from the heating device 2 to the heat conducting substrate 331. The heat sink 33 is detachably connected to the side of the heat conducting substrate 331 away from the insulating layer, and the heat sink body 332 is at least partially located at the side of the heat dissipating air opening 12 away from the accommodating cavity 11. Structural style like this, can realize packing the device 2 that generates heat in holding chamber 11 through heat conduction base plate 331, circuit layer and insulating filler 4 promptly, dust in the air current, moisture or electrically conductive piece can't influence packing the device 2 that generates heat in holding chamber 11, heat conduction base plate 331 both plays the effect of packing the device 2 that generates heat, be convenient for install radiator body 332 again, radiator body 332 is connected with heat conduction base plate 331 detachably, even radiator body 332 is pulled down from heat conduction base plate 331, can not influence the device 2 that generates heat and be packed in holding chamber 11 yet, do not rely on radiator body 332 to pack the device 2 that generates heat. Even if the heat sink body 332 exposed outside the insulating filler 4 is damaged, the heat sink body 332 is dismounted for maintenance and then the heat sink body 332 is mounted, so that the related structure of the packing heat-generating device 2 cannot be damaged in the maintenance process of the heat sink body 332, and the maintenance cost is reduced.

In one embodiment, a heat conductive filler may be filled between the heat conductive substrate 331 and the heat sink body 332. Illustratively, the heat conductive silicone grease is filled between the heat conductive substrate 331 and the heat sink body 332.

In an embodiment, referring to fig. 1, fig. 3, and fig. 5 to fig. 11, the heat conducting substrate 331 is located in the accommodating cavity 11, the heat conducting substrate 331 and the control box 1 are enclosed to form a gap 6 extending along a circumferential direction of the heat conducting substrate 331, and the insulating filler 4 is at least partially filled in the gap 6 to isolate the heat generating device 2 from a side of the heat dissipating air opening 12 away from the accommodating cavity 11. With the structure, the heat conducting substrate 331 can be stably kept in the accommodating cavity 11 of the control box 1 through the insulating filler 4 at the gap 6, the heating device 2 is tightly sealed, and the possibility that the dust, moisture, conductive debris and the like influence the heating device 2 to damage a circuit is reduced.

In one embodiment, the circuit layer, the insulating layer and the heat conducting substrate 331 are connected in sequence. In such a structure, the circuit layer, the insulating layer and the heat conducting substrate 331 are connected together, and the circuit layer, the insulating layer and the heat conducting substrate 331 as a whole are convenient for installation of the heating device 2, and are beneficial to modularization production of the circuit layer, the insulating layer and the heat conducting substrate 331.

In one embodiment, the circuit layer is made of copper foil.

In one embodiment, the heat conducting substrate 331 is an aluminum substrate.

In one embodiment, the heat sink body 332 is made of aluminum.

In one embodiment, the heat sink body 332 includes heat dissipating fins.

In one embodiment, referring to fig. 4, the heat generating device 2 is in surface contact with the heat dissipating assembly 3. With such a structure, the heat transfer area between the heating device 2 and the heat dissipation assembly 3 is large, which is beneficial to transferring the heat generated by the heating device 2 to the heat dissipation assembly 3.

In one embodiment, the IGBT is in surface contact with the heat dissipation assembly 3.

In one embodiment, the heat generating device 2 is soldered to the heat dissipating assembly 3.

In one embodiment, the heating device 2 and the heat dissipation assembly 3 are welded by surface mount welding.

In an embodiment, referring to fig. 7 and 8, the main control board 5 is located in the accommodating cavity 11, and the main control board 5 and one side of the heat dissipation air opening 12 departing from the accommodating cavity 11 are isolated by the insulating filler 4. With the structure, the main control board 5 is sealed in the accommodating cavity 11, and dust, moisture and conductive debris in the airflow hardly contact with the main control board 5 to cause circuit damage.

It can be understood that the main control board 5 generates a small amount of heat, and the heat dissipation problem of the main control board 5 enclosed in the accommodating cavity 11 does not need to be considered excessively.

In one embodiment, the insulating filler 4 is capable of solidifying from a liquid state to a solid state at room temperature. According to the structure, the liquid insulating filler 4 can flow in the accommodating cavity 11 so as to be well filled in the corresponding positions in the accommodating cavity 11 according to the shapes of the heating devices 2 and the like, almost no dead angle exists, the heating devices 2 can be well insulated and isolated, after the liquid insulating filler 4 flows to the corresponding positions of the accommodating cavity 11, the liquid insulating filler 4 is solidified into a solid state to keep the insulating filler 4 in a solidified state, and therefore the heating component can be well sealed in the accommodating cavity 11 and cannot be influenced by the placing position of the box 1. For example, after the liquid insulating filler 4 is solidified into a solid state, no matter the heat dissipation air opening 12 is upward, downward, left, or right, or the heat dissipation air opening 12 is turned upside down, the insulating filler 4 solidified into a solid state can be sealed in the accommodating cavity 11 in the heat generating device 2.

The room temperature is a normal room temperature at which temperature treatment (for example, temperature increase, temperature decrease, and the like) is not performed. Illustratively, room temperature may be 25 ℃.

It is understood that room temperature may be in the range of 10 deg.C to 30 deg.C.

In one embodiment, the insulating filler 4 may be a resin. At room temperature, the resin may be in a liquid state, and the addition of the curing agent to the resin may solidify the liquid resin into a solid state.

In one embodiment, the heat dissipation air port 12 faces upwards, the accommodating cavity 11 provided with the heating device 2 is filled with the liquid insulating filler 4, the heating device 2 is encapsulated in the accommodating cavity 11, and the liquid insulating filler 4 is solidified into a solid state.

In an embodiment, referring to fig. 8, 10 and 11, a surface of the heat conducting substrate 331 facing away from the heat generating device 2 is a reference surface 3311, a surface of the insulating filler 4 solidified from a liquid state to a solid state facing toward the heat sink body 332 is a sealing surface 41, and the sealing surface 41 coincides with the reference surface 3311.

In one embodiment, referring to fig. 1 and fig. 2, the host computer has a working portion 404, and the working portion 404 is used for performing corresponding processing on the material.

In one embodiment, referring to fig. 1 and 2, the main body includes a motor 401, a transmission member 402, and a grinding wheel 403. The motor 401 drives the transmission part 402 to make the transmission part 402 drive the grinding wheel 403 to rotate, and the rotating grinding wheel 403 can be used for grinding materials. The working portion 404 is located at the grinding wheel 403.

In one embodiment, the grinding wheel 403 may be a grinding wheel.

In one embodiment, referring to fig. 1, the motor 401 is drivingly connected to the transmission member 402, and the grinding wheel 403 is sleeved on the output shaft of the transmission member 402 and rotates along with the output shaft of the transmission member 402.

In one embodiment, the transmission member 402 includes two bevel gears engaged with each other, the output shaft of the motor 401 is drivingly connected to one of the bevel gears, and the other bevel gear is sleeved on the output shaft of the transmission member 402.

In one embodiment, referring to fig. 1, the wind wheel 300 is drivingly connected to a motor 401, and the motor 401 drives the wind wheel 300 to rotate.

It will be appreciated that dust and conductive debris may be generated during the processing of the material by the power tool, and the operator may position the working portion 404 as far down as possible to avoid dust falling onto the operator. In view of this, in an embodiment, referring to fig. 1, fig. 8, fig. 10 and fig. 11, along the arrangement direction of the accommodating cavity 11 and the heat dissipation air opening 12, the heat dissipation air opening 12 is located on a side of the accommodating cavity 11 facing the working portion 404. With such a configuration, when the operator operates the electric power tool to make the working portion 404 face downward, the heat dissipation air opening 12 is located on the side of the accommodating chamber 11 facing the working portion 404 so that the heat dissipation air opening 12 is located substantially below the accommodating chamber 11, and due to the influence of gravity and the like, even if the air flow with the dust and the conductive debris passes through the heat dissipation air opening 12 below the accommodating chamber 11, the dust and the conductive debris in the air flow are unlikely to accumulate in the accommodating chamber 11 of the control box 1, and the influence of the dust and the debris on the heat generating device 2 is reduced.

In an embodiment, referring to fig. 8 and 11, the arrangement direction of the accommodating cavity 11 and the heat dissipating air opening 12 is the direction indicated by the arrow R5.

In an embodiment, referring to fig. 1 and 12, the housing 200 further forms a mounting cavity 204 and a transition tuyere 205 respectively communicating the mounting cavity 204 and the electric control area 201. The wind wheel 300 is located in the installation cavity 204, and when the wind wheel 300 rotates, the airflow sequentially flows through the air inlet 202, the heat dissipation assembly 3, the transition air opening 205, the installation cavity 204 and the air outlet. In such a structure, the direction of the airflow in the electric control area 201 flowing out of the electric control area 201 can be controlled through the transition air opening 205, and the position of the transition air opening 205 can be set according to actual needs so that the airflow in the electric control area 201 flows towards the transition air opening 205.

It can be understood that, since the heat dissipation assembly 3 is disposed through the heat dissipation air opening 12, the heat dissipation assembly 3 is partially located outside the accommodating cavity 11, and the air flow of the electric control area 201 needs to flow through the heat dissipation assembly 3 at the heat dissipation air opening 12 as much as possible, so as to improve the heat dissipation efficiency of the heat dissipation assembly 3 for the heat generating device 2. In view of this, in an embodiment, referring to fig. 1 and fig. 12, the transition air opening 205 is located between the electric control area 201 and the mounting cavity 204, and along the arrangement direction of the accommodating cavity 11 and the heat dissipation air opening 12, the transition air opening 205 is located on a side of the accommodating cavity 11 facing the heat dissipation air opening 12. In such a structure, the airflow in the electric control area 201 needs to flow out of the electric control area 201 from the transition air opening 205 located between the electric control area 201 and the installation cavity 204, and because the transition air opening 205 is located on one side of the accommodating cavity 11 facing the heat dissipation air opening 12 in the arrangement direction of the accommodating cavity 11 and the heat dissipation air opening 12, most of the airflow flowing to the transition air opening 205 in the electric control area 201 can pass through the heat dissipation assembly 3 at the heat dissipation air opening 12, which is favorable for the heat dissipation efficiency.

In one embodiment, referring to fig. 1, the motor 401 is located in the mounting cavity 204, and the air flowing to the mounting cavity 204 through the air-passing opening 205 can cool the motor 401.

In an embodiment, referring to fig. 9, the control system 100 further includes an operating mechanism, the operating mechanism is disposed through the housing 200 and connected to the main control board 5, and the operating mechanism is located on a side of the control box 1 away from the heat dissipation air opening 12 along the arrangement direction of the accommodating cavity 11 and the heat dissipation air opening 12. In such a structure, because along the arrangement direction of the accommodating cavity 11 and the heat dissipation air port 12, the transition air port 205 is located at one side of the accommodating cavity 11 facing the heat dissipation air port 12, the air flow entering the electric control area 201 through the air inlet 202 is mainly influenced by the transition air port 205 to flow through from one side of the control box 1 facing the heat dissipation air port 12, the air flow entering the electric control area 201 through the air inlet 202 hardly flows through one side of the control box 1 deviating from the heat dissipation air port 12, the operation mechanism is arranged at one side of the control box 1 deviating from the heat dissipation air port 12, so that the influence of the air flow flowing through the heat dissipation air port 12 in the electric control area 201 on the operation mechanism is small, and the possibility of circuit damage caused by the flowing of dust, moisture and conductive debris in the air flow to the operation mechanism is low. Moreover, operating device is located the one side that control box 1 deviates from heat dissipation wind gap 12 for operating device no longer occupies the position on main control board 5 and arranges, and the space of the one side that control box 1 deviates from heat dissipation wind gap 12 has obtained make full use of.

In one embodiment, referring to fig. 9, the operating mechanism includes a first operating mechanism 71 and a second operating mechanism 72, and the first operating mechanism 71 and the second operating mechanism 72 are respectively disposed at different positions of the housing 200, so that an operator can respectively operate the first operating mechanism 71 and/or the second operating mechanism 72 from different positions of the housing 200.

In one embodiment, referring to fig. 9, the first operating mechanism 71 is a first start switch, and the first start switch is used for starting or stopping the power tool. The second operating mechanism 72 is a second start switch or a speed potentiometer.

In one embodiment, the first operating mechanism 71 and the second operating mechanism 72 are arranged in the front-rear direction, and the first operating mechanism 71 is located on the front side of the second operating mechanism 72.

In one embodiment, referring to fig. 1, the direction "front" is the direction indicated by the arrow R1, and the direction "back" is the direction indicated by the arrow R2. The direction "up" or "top" is the direction indicated by the arrow R3 in the drawing, and the direction "down" or "bottom" is the direction indicated by the arrow R4 in the drawing.

It can be understood that, when the first operating mechanism 71 is a first start switch, the second operating mechanism 72 can be a second start switch, and the operator can start or stop the electric tool through the first start switch according to the requirement of convenient actual operation, and can also start or stop the electric tool through the second start switch according to the requirement of convenient actual operation. Illustratively, the power tool is activated or deactivated by a first activation switch located on the front side, or by a second activation switch.

It is understood that when the first operating mechanism 71 is a first start switch, the second operating mechanism 72 may be a regulation potentiometer, and the operator may start and stop the power tool through the first start switch, and when the power tool is in a start state, the output rotation speed of the power tool may be regulated through the regulation potentiometer. For example, the electric tool is an angle grinder, and the rotation speed of the grinding wheel can be adjusted by a speed-regulating potentiometer.

In one embodiment, the three-phase output terminal connected to the main control board 5 is at least partially located on a side of the control box 1 away from the heat dissipation air opening 12, and the three-phase output terminal is connected to the motor 401 to supply power to the motor 401. The three-phase output terminal is partially located on one side of the control box 1 departing from the heat dissipation air opening 12, and the influence of dust, moisture, conductive debris and the like in the air flow of the electric control area 201 on the opposite output terminal can be reduced.

In one embodiment, referring to fig. 9, the three-phase output terminal includes a U-phase output terminal, a V-phase output terminal, and a W-phase output terminal.

In an embodiment, referring to fig. 13, an ac power source externally connected to the main control board 5 is rectified by a rectifying circuit 501 of the main control board 5 to convert ac power into dc power.

In one embodiment, the rectifying circuit 501 full-wave rectifies the alternating current.

It can be understood that the direct current obtained by rectifying the alternating current by the rectifier circuit 501 is a pulsating direct current, and the pulsating direct current has a characteristic that the magnitude of the current changes although the direction of the current does not change.

In an embodiment, referring to fig. 1, fig. 3, fig. 5 to fig. 7, and fig. 13, the control system 100 further includes a first electrolytic capacitor 8 connected to the main control board 5, wherein the first electrolytic capacitor 8 is used for suppressing a current peak value at an output side of the rectifying circuit 501 of the main control board 5. In this configuration, the current peak value of the ripple current on the output side of the rectifier circuit 501 is cancelled by the first electrolytic capacitor 8 connected to the main control board 5, so that the ripple current on the output side of the rectifier circuit 501 of the main control board 5 is smoothed, and a direct current suitable for the chopper circuit 502 to perform the chopping processing is obtained.

In one embodiment, referring to fig. 9 and 13, the dc power is chopped by the chopper circuit 502 to form U, V, and W phases, and then is supplied to the dc motor 401.

In an embodiment, referring to fig. 3, fig. 5, fig. 6 and fig. 7, the control system 100 further includes a mounting substrate 9, and the first electrolytic capacitor 8 is mounted on the main control board 5 through the mounting substrate 9.

In one embodiment, referring to fig. 13, the first electrolytic capacitor 8 is connected to the output side of the rectifying circuit 501 and the input side of the chopper circuit 502.

In one embodiment, referring to fig. 13, the first electrolytic capacitor 8 is connected in parallel with the rectifying circuit 501 and the chopper circuit 502, respectively.

In one embodiment, referring to fig. 13, the first electrolytic capacitor 8 is connected between the rectifying circuit 501 and the chopper circuit 502.

In an embodiment, referring to fig. 13, the number of the first electrolytic capacitors 8 may be two, and the two first electrolytic capacitors 8 are connected in parallel.

In an embodiment, referring to fig. 3 and fig. 5 to 8, when the main control board 5 is located in the accommodating cavity 11, the main control board 5 and one side of the heat dissipation air opening 12 departing from the accommodating cavity 11 are isolated by the insulating filler 4, and the first electrolytic capacitor 8 is disposed through the heat dissipation air opening 12 so that the first electrolytic capacitor 8 is partially located on one side of the heat dissipation air opening 12 departing from the accommodating cavity 11. According to the structure, the main control board 5 is isolated by the insulating filler 4, the first electrolytic capacitor 8 is connected with the main control board 5, so that the first electrolytic capacitor 8 is partially isolated by the insulating filler 4, the first electrolytic capacitor 8 is partially located on one side of the heat dissipation air opening 12, which faces away from the accommodating cavity 11, so that the first electrolytic capacitor 8 is partially exposed out of the insulating filler 4, the part of the first electrolytic capacitor 8 connected with the main control board 5 is isolated by the insulating filler 4, and the part of the first electrolytic capacitor 8 exposed out is not electrically connected, dust, moisture and conductive debris in air flow hardly have great influence on the part of the first electrolytic capacitor 8 exposed out of the insulating filler 4, and the partial exposure of the first electrolytic capacitor 8 out of the insulating filler 4 is beneficial for heat dissipation of the air flow flowing through the heat dissipation air opening 12 on the first electrolytic capacitor 8.

In an embodiment, referring to fig. 3 and fig. 5 to 8, the first electrolytic capacitor 8 is cylindrical, an axial span of the first electrolytic capacitor 8 is greater than a radial span of the first electrolytic capacitor 8, and an axial direction of the first electrolytic capacitor 8 is parallel to the main control board 5. With such a structure, the span of the first electrolytic capacitor 8 along the arrangement direction of the accommodating cavity 11 and the heat dissipation air opening 12 is approximately the radial span of the first electrolytic capacitor 8, the space occupied by the first electrolytic capacitor 8 along the arrangement direction of the accommodating cavity 11 and the heat dissipation air opening 12 is smaller, the obstruction effect of the first electrolytic capacitor 8 on the air flow flowing through the heat dissipation air opening 12 is smaller, the vibration of the first electrolytic capacitor 8 on the air flow flowing through the heat dissipation air opening 12 is reduced, the air flow of the electric control area 201 can smoothly flow through the heat dissipation air opening 12, the heat dissipation of the heat dissipation assembly 3 at the heat dissipation air opening 12 is better, and the heat dissipation efficiency is improved.

In an embodiment, referring to fig. 3 and fig. 5 to 8, the arrangement direction of the two first electrolytic capacitors 8 is parallel to the main control board 5.

In one embodiment, the pins of the two first electrolytic capacitors 8 connected to the main control board 5 are immersed in the insulating filler 4. In this way, the possibility of a creepage phenomenon occurring between the two first electrolytic capacitors 8 can be reduced. Exemplarily, the pins of the two first electrolytic capacitors 8 connected to the main control board 5 are immersed in the resin.

In an embodiment, the control system 100 further includes a second electrolytic capacitor, the second electrolytic capacitor is connected to the main control board 5, the second electrolytic capacitor is connected to the constant voltage power circuit of the main control board 5, the second electrolytic capacitor is located in the accommodating cavity 11, and the insulating filler 4 isolates the second electrolytic capacitor and one side of the heat dissipation air opening 12 away from the accommodating cavity 11. Because the constant voltage power supply circuit has less current flowing through the second electrolytic capacitor and less heat productivity, even if the second electrolytic capacitor is isolated in the accommodating cavity 11 by the insulating filler 4, less heat dissipated by the second electrolytic capacitor can be dissipated in time, the second electrolytic capacitor is not overheated, and the normal work of the second electrolytic capacitor is not influenced.

In one embodiment, the constant voltage power supply circuit is used to supply power to the control portion of the main control board 5. For example, a constant voltage power supply circuit is used to supply power to the processor of the main control board 5.

In one embodiment, referring to fig. 1 and 2, housing 200 includes a chassis 206 and a tail cap 207 coupled to each other, and chassis 206 and tail cap 207 enclose an electrical control area 201.

In one embodiment, referring to fig. 1, the mounting cavity 204 is formed in the housing 206.

In one embodiment, the transition tuyere 205 is formed in the casing 206.

In one embodiment, referring to fig. 2, the intake vent 202 is formed in the tail cap 207.

In one embodiment, the air outlet is formed in the housing 206.

In an embodiment, it can be understood that the control system 100 according to the embodiment of the present application may be used not only for dissipating heat of a chopping switch of an angle grinder, but also for dissipating heat of other components with heat dissipation and insulation requirements.

In one embodiment, the control box 1 is rectangular.

In an embodiment, referring to fig. 12, the electric power tool further includes a wind shielding plate 10, where the wind shielding plate 10 is disposed on a side of the control box 1 away from the heat dissipation air opening 12 to limit the air flow of the electric control area 201 from the side of the control box 1 away from the heat dissipation air opening 12 to flow to the mounting cavity 204.

In one embodiment, the first electrolytic capacitor 8 is on the back side of the chopper switch. In this way, the device with a small heat generation amount is cooled first, and the device with a large heat generation amount is cooled second.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control system, comprising:

the heating device is positioned in the accommodating cavity;

the heat dissipation assembly is connected with the heating device and penetrates through the heat dissipation air opening so as to be partially positioned outside the accommodating cavity;

and the main control board is connected with the heating device.

2. The control system of claim 1, wherein the heat sink assembly comprises:

a circuit layer at least partially connected with the heat generating device;

3. The control system of claim 2, wherein the heat sink comprises:

4. The control system of claim 3, wherein the heat-conducting substrate is located in the accommodating cavity, the heat-conducting substrate and the control box are enclosed into a gap extending along the circumferential direction of the heat-conducting substrate, and the insulating filler is at least partially filled in the gap to isolate the heat-generating device from a side of the heat-dissipating air opening away from the accommodating cavity.

5. The control system of claim 3, wherein the circuit layer, the insulating layer, and the thermally conductive substrate are connected in sequence.

6. The control system according to any one of claims 1 to 5, wherein the heat generating device is in surface contact with the heat dissipating component.

7. The control system according to any one of claims 1 to 5, wherein the heat generating device is a chopper switch of a chopper circuit.

8. The control system according to any one of claims 1 to 5, wherein the insulating filler is capable of solidifying from a liquid state to a solid state at room temperature.

9. The control system according to any one of claims 1 to 5, wherein the main control board is located in the accommodating cavity, and the main control board and one side of the heat dissipation air opening, which is away from the accommodating cavity, are isolated by the insulating filler.

10. An electric power tool, comprising:

a control system according to any one of claims 1 to 8, located within the electrically controlled zone;

the wind wheel is positioned in the shell; and

and the main machine is used for driving the wind wheel to rotate so as to enable the airflow to sequentially flow through the air inlet, the heat dissipation assembly and the air outlet.

11. The power tool of claim 10, wherein the main body has a working portion, and the heat dissipation vent is located on a side of the accommodating chamber facing the working portion in an arrangement direction of the accommodating chamber and the heat dissipation vent.

12. The power tool of claim 10, wherein the housing further defines a mounting cavity and a transition air opening respectively communicating the mounting cavity and the electrical control area, the wind wheel is located in the mounting cavity, the transition air opening is located between the electrical control area and the mounting cavity, and along the arrangement direction of the receiving cavity and the heat dissipation air opening, the transition air opening is located on one side of the receiving cavity facing the heat dissipation air opening, and when the wind wheel rotates, the airflow sequentially flows through the air inlet, the heat dissipation assembly, the transition air opening, the mounting cavity and the air outlet.

13. The power tool of claim 12, wherein the control system further comprises an operating mechanism, the operating mechanism is disposed through the housing and connected to the main control board, and the operating mechanism is located on a side of the control box away from the heat dissipation air opening.

14. The electric tool as claimed in claim 10, wherein the main control board is located in the accommodating cavity, and the main control board and one side of the heat dissipation air opening facing away from the accommodating cavity are isolated by the insulating filler; the control system further comprises a first electrolytic capacitor connected with the main control board, the first electrolytic capacitor is used for inhibiting a current peak value of an output side of the rectifying circuit of the main control board, the first electrolytic capacitor penetrates through the heat dissipation air opening to enable the first electrolytic capacitor to be partially located on one side, deviating from the accommodating cavity, of the heat dissipation air opening, the first electrolytic capacitor is cylindrical, the axial span of the first electrolytic capacitor is larger than the radial span of the first electrolytic capacitor, and the axial direction of the first electrolytic capacitor is parallel to the main control board.