CN219642698U

CN219642698U - Integrated switch heat radiation structure of electric tool

Info

Publication number: CN219642698U
Application number: CN202223033897.7U
Authority: CN
Inventors: 李秋君; 陈宇星; 洪玉明
Original assignee: Zhejiang Ken Tools Co ltd; Ken Holding Co ltd
Current assignee: Zhejiang Ken Tools Co ltd; Ken Holding Co ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-09-05
Anticipated expiration: 2032-11-14

Abstract

The utility model relates to the field of electric tools, in particular to an integrated switch radiating structure of an electric tool, which comprises a shell, a rear cover, a stator-rotor assembly and an integrated switch, wherein a containing cavity is formed in the shell, the rear cover is arranged at the rear side of the upper end of the shell, the stator-rotor assembly is arranged at the upper part of the containing cavity, the integrated switch is arranged in the middle of the containing cavity, a rotor fan blade is arranged at the rear end of the stator-rotor assembly, an air inlet is formed in the surface of the lower end of the shell, an air outlet is formed in the rear cover, an air channel I is communicated with the upper end of the interior of the containing cavity, the air channel I is communicated with the air outlet, an air channel II is communicated with the air inlet, air is sucked into the containing cavity from the air inlet at the lower end through the air channel I, and flows through the surface of the integrated switch to take away hot air gathered on the surface of the integrated switch, so that the surface of the integrated switch carries out continuous air flow, the radiating effect is improved, and heat is not gathered.

Description

Integrated switch heat radiation structure of electric tool

Technical Field

The utility model relates to the field of electric tools, in particular to an integrated switch heat dissipation structure of an electric tool.

Background

The lithium electric tool adopting the plug-in battery pack in the existing market uses few integrated switches, and under the normal condition, the switch of the electric tool and a PCBA board (printed circuit board) are two independent and separated components, the PCBA board is positioned on the upper side or the left side of the switch of the electric tool, after the PCBA board and the switch are combined to form the integrated switch, when the electric tool works, heat is generated after the current passes through the integrated switch, so that the heat dissipation performance of the integrated switch needs to be considered.

According to joule law q=i ² Rt is known to be achieved by reducing the current or reducing the resistance if the amount of heat generated during operation of the PCBA board is to be reduced. In the prior art, the following two schemes are generally adopted to reduce the surface temperature of the PCBA board, but the two schemes have corresponding technical problems: under the condition that other conditions are unchanged, the working current is reduced, and the problem is that the working capacity of the product is reduced; the resistance is reduced, the specification of the MOS tube needs to be improved, and the problem is that the product cost is increased.

The utility model discloses a CN114709095A discloses a fixed and heat radiation structure of electric tool switch part, including base, apron, PCB board, switching-over subassembly and push rod etc. through with MOS pipe homonymy design fin and add sealed bubble cotton, better guaranteed the radiating effect and the dustproof effect of MOS pipe, though improved heat dispersion, set up heat conduction efficiency slowly through single fin for the switching-on temperature is still higher.

Disclosure of Invention

The utility model provides an integrated switch heat dissipation structure of an electric tool, which aims to solve the problem of low heat dissipation efficiency of an integrated switch in the prior art.

The aim of the utility model can be achieved by the following technical scheme: an integrated switch heat dissipation structure for a power tool includes: casing, battery package, back lid, stator and rotor subassembly and integrated switch, the inside chamber that holds that is equipped with of casing, the battery package sets up in holding the chamber lower extreme, through battery package to stator and rotor subassembly and integrated switch power supply, the back lid is installed in casing upper end rear side, stator and rotor subassembly sets up in holding chamber upper portion, integrated switch sets up in holding the chamber middle part, stator and rotor subassembly rear end is equipped with the rotor fan blade, casing lower extreme surface is equipped with the air intake, the back lid is just to the rotor fan blade setting, the back is covered and is equipped with the air outlet, hold intracavity portion upper end intercommunication and have wind channel one, wind channel one and air outlet intercommunication, hold intracavity portion lower extreme intercommunication and have wind channel two, wind channel two and air intake intercommunication.

Further improvement, hold the chamber and include cavity one, cavity two and cavity three, the battery package sets up in cavity one, integrated switch sets up in cavity two, stator and rotor subassembly sets up in cavity three.

Further improved, the first cavity is arranged opposite to the air inlet.

Further improvement, the air inlets are symmetrically provided with two groups, and the air outlets are symmetrically provided with two groups.

Further improved, the third cavity is communicated with a second air inlet which is arranged on the upper end surface of the shell.

Compared with the prior art, the integrated switch heat dissipation structure of the electric tool has the beneficial effects that:

through inside wind channel one and wind channel two, from the air intake of lower extreme inspired air gets into and holds the intracavity, and the air current flows through integrated switch surface, takes away the hot air of integrated switch surface gathering, makes integrated switch surface carry out continuous air flow, improves the radiating effect, and heat does not gather.

Drawings

FIG. 1 is a schematic view of the structure of the present utility model

FIG. 2 is a schematic view of the structure of the inside of the present utility model

FIG. 3 is a schematic view of the structure of the present utility model

In the figure, the device comprises a 1-shell, a 11-containing cavity, a 111-cavity I, a 112-cavity II, a 113-cavity III, a 2-battery pack, a 3-rear cover, a 4-stator and rotor assembly, 41-rotor blades, a 5-integrated switch, a 51-PCBA board, a 52-switch, a 61-air inlet, a 62-air outlet, a 63-air inlet II, a 71-air channel I and a 72-air channel II.

Detailed Description

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The technical scheme of the utility model is further described below with reference to the examples and the accompanying figures 1-3.

Example 1

An integrated switch heat dissipation structure for a power tool, comprising: the integrated switch comprises a shell 1, a battery pack 2, a rear cover 3, a stator and rotor assembly 4 and an integrated switch 5, wherein a containing cavity 11 is formed in the shell 1, the battery pack 2 is arranged at the lower end of the containing cavity 11, the stator and rotor assembly 4 and the integrated switch 5 are powered through the battery pack 2, the rear cover 3 is mounted at the rear side of the upper end of the shell 1, the stator and rotor assembly 4 is arranged at the upper part of the containing cavity 11, the integrated switch 5 is arranged at the middle part of the containing cavity, rotor blades 41 are arranged at the rear end of the stator and rotor assembly 4, an air inlet 61 is formed in the surface of the lower end of the shell 1, the rear cover 1 is opposite to the rotor blades 41, an air outlet 62 is formed in the rear cover 1, an air duct I71 is communicated with the air outlet 62, an air duct II 72 is communicated with the lower end of the inner part of the containing cavity 11, the air duct II 72 is communicated with the air inlet 61, the integrated switch 5 comprises an A plate 51 and a switch 52, the containing cavity I111, a cavity II 112 and a cavity III 113 are arranged in the cavity II, the battery pack 2 is arranged in the cavity II and the cavity 111 is arranged in the cavity II and the rotor assembly 4.

During the use process of the product, the current provided by the battery pack 2 continuously flows through the inside of the integrated switch 5, and a large amount of heat is emitted to gather on the surface of the integrated switch 5. In order to improve the heat dissipation capacity of the integrated switch 5, an air inlet system is required to be added in the machine shell, the battery pack 2 provides electric energy to the stator and rotor assembly 4, the stator coil loop generates a magnetic field to drive the rotor with the permanent magnet to rotate, the rotor blade 41 at the rear end rotates at a high speed, a pressure difference is generated between the inside and the outside of the machine shell 1, a large amount of air is thrown out from the air outlet 62 of the rear cover 1, air is required to be pumped from the outside into the machine shell 1, the pressure is balanced, the air sucked from the air inlet 61 at the lower end enters the accommodating cavity 11 through the air channel I71 and the air channel II 72 in the interior, the air flows through the surface of the integrated switch 5, hot air gathered on the surface of the integrated switch 5 is taken away, the continuous air flow is performed on the surface of the integrated switch 5, the heat dissipation effect is improved, and the heat is not gathered.

Under the condition of not reducing the product performance and improving the cost, the air inlet and outlet and the rotor blades are matched through the air duct, so that the problem that the heat accumulated by the integrated switch cannot be effectively dissipated is solved, and the service life of the whole machine is prolonged.

Compared with the prior art, the integrated switch surface temperature is reduced by 5 ℃ by the optimized shell with the air duct structure.

As a further preferred embodiment, the first cavity 111 is disposed opposite to the air inlet 61, as shown in fig. 1 and 3, and the air flow enters the cavity 111 from the air inlet 61 to dissipate heat of the battery pack.

As a further preferred embodiment, the air inlets 61 are symmetrically arranged in two groups, and the air outlets 62 are symmetrically arranged in two groups. Through two sets of air intakes 61 and air outlet 62, improve the inside air flow efficiency of cavity 11, improve the radiating effect to integrated switch 5.

As a further preferred embodiment, the third cavity 113 is communicated with the second air inlet 63, the second air inlet 63 is disposed on the upper end surface of the casing 1, and the air inlet is increased by adding the second air inlet 63, so that the air flow efficiency in the cavity 11 is improved, the heat dissipation effect on the integrated switch 5 is improved, and the heat dissipation efficiency is improved for the stator and rotor assembly 4.

The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims

1. An integrated switch heat dissipation structure for a power tool, comprising: casing, battery package, back lid, stator and rotor subassembly and integrated switch, the inside chamber that holds that is equipped with of casing, the battery package sets up in holding chamber lower extreme, through battery package to stator and rotor subassembly and integrated switch power supply, the back lid is installed in casing upper end rear side, stator and rotor subassembly sets up in holding chamber upper portion, integrated switch sets up in holding chamber middle part, its characterized in that, stator and rotor subassembly rear end is equipped with the rotor fan blade, the casing lower extreme surface is equipped with the air intake, the back lid is just to the rotor fan blade setting, the back is covered and is equipped with the air outlet, hold intracavity portion upper end intercommunication has wind channel one, wind channel one and air outlet intercommunication, hold intracavity portion lower extreme intercommunication have wind channel two, wind channel two and air intake intercommunication.

2. The integrated switch heat dissipation structure of a power tool according to claim 1, wherein the accommodating cavity comprises a first cavity, a second cavity and a third cavity, the battery pack is disposed in the first cavity, the integrated switch is disposed in the second cavity, and the stator and rotor assembly is disposed in the third cavity.

3. The integrated switch heat dissipating structure of claim 2, wherein said cavity is disposed directly opposite said air inlet.

4. The integrated switch heat dissipation structure of a power tool of claim 1, wherein the air inlets are symmetrically arranged in two groups, and the air outlets are symmetrically arranged in two groups.

5. The heat dissipation structure of an integrated switch of a power tool according to claim 2, wherein the third cavity is communicated with a second air inlet, and the second air inlet is disposed on an upper end surface of the housing.