Heat dissipation structure of electric tool

Abstract

The utility model relates to the field of electric tools, in particular to a heat dissipation structure of an electric tool, which comprises a protective sleeve, and an axle box, a middle cover, a stator and rotor assembly and a fan which are arranged in the protective sleeve rightwards in sequence, and an air hole is formed in the middle cover and communicated with a first air channel at the right end of the axle box. A side air opening in the outer side of the first air channel penetrates to the outside of the protective sleeve, a front air opening in the left side of the first air channel is communicated with a second air channel between the protective sleeve and the axle box, the axle box is provided with a multi-point-position supporting bone position, and the multi-point-position supporting bone position is provided with an air guide transition face. The middle cover and the axle box are arranged in a low-wind-resistance double-air-duct mode, the point position shape is specially designed in a low-wind-resistance mode, resistance borne by airflow generated by the motor when the airflow passes through the middle cover, the axle box and the protective sleeve is reduced, therefore, loss of airflow energy is reduced, heat dissipation efficiency is improved, and it is guaranteed that the temperature of the holding position of the electric tool cannot be too high, and hands cannot be scalded.

Description

Technical Field

[0001] The utility model relates to the field of electric tools, in particular to a heat dissipation structure of an electric tool. Background Art

[0002] In the existing electric tools, the front end of the axle box has an electric grinder with a heat dissipation function. The straight ribs on the axle box or the protective sleeve isolate several vertical grooves between the axle box and the protective sleeve to form a vertical air duct for dissipating heat from the axle box. However, the solution of several vertical air ducts will forcibly correct the spiral airflow formed by the motor fan into an axial airflow, resulting in a weakening of the airflow energy, and then resulting in a poor heat dissipation effect. Therefore, in order to solve the deficiencies in the existing technology, it is necessary to design a simple electric tool heat dissipation structure. Utility Model Content

[0003] The utility model provides a heat dissipation structure for an electric tool in order to solve the problems of the prior art.

[0004] The purpose of the utility model can be achieved through the following technical solutions: a heat dissipation structure of an electric tool comprises: a protective cover and an axle box, an intermediate cover, a stator and rotor assembly and a fan which are arranged inside the protective cover to the right in sequence, the intermediate cover is provided with air holes, the air holes are connected to air duct one at the right end of the axle box, the side air outlet outside the air duct one passes through to the outside of the protective cover, the front air outlet on the left side of the air duct one is connected to air duct two between the protective cover and the axle box, the axle box is provided with multi-point support bones, and the multi-point support bones are provided with air guide transition surfaces.

[0005] As a further improvement, the side air vents are arranged to be inclined toward the left side and outward, and the front air vents are arranged to be inclined toward the left side and inward.

[0006] As a further improvement, four groups of air holes are arranged at intervals on the middle cover, and an air guiding inclined surface is provided on one side of the air hole along which the air flows out.

[0007] As a further improvement, the cross-section of the multi-point support frame is set in a low wind resistance shape such as a teardrop shape, a shuttle shape, a runway shape or a circle.

[0008] As a further improvement, the multi-point support frame includes an air guide block 1 and an air guide block 2 which are arranged in sequence to the right at intervals. The right end cross-section of the air guide block 1 is semicircular, the cross-section of the air guide block 2 is teardrop-shaped, and the head of the teardrop-shaped air guide block 2 is arranged to the left.

[0009] As a further improvement, the multi-point support frame includes an air guide block three and an air guide block four which are arranged in sequence to the right at intervals, the right end cross-section of the air guide block three is a teardrop-shaped head, the cross-section of the air guide block four is a teardrop-shaped head, and the teardrop-shaped head of the air guide block four is arranged to the right.

[0010] As a further improvement, the multi-point support frame includes an air guide block five and an air guide block six which are arranged in sequence to the right at intervals. The cross-section of the right end of the air guide block five is semicircular, and the cross-section of the air guide block six is ​​runway-shaped.

[0011] As a further improvement, the multi-point support frame includes an air guide block seven and an air guide block eight which are sequentially arranged to the right at intervals, the right end cross-section of the air guide block seven is conical, and the cross-section of the air guide block eight is shuttle-shaped.

[0012] As a further improvement, the multi-point support frame includes an air guide block nine and air guide blocks ten which are arranged in sequence to the right at intervals. The cross-section of the right end of the air guide block nine is semicircular, and the cross-section of the air guide block ten is circular.

[0013] As a further improvement, the multi-point support bone positions are arranged obliquely along the airflow direction.

[0014] Compared with the prior art, the heat dissipation structure of the electric tool of the utility model has the following beneficial effects:

[0015] Multi-point support frames are used between the axle box and the protective cover, and the dual air duct setting of the middle cover and the axle box with low wind resistance is combined. The point shape is specially designed with low wind resistance to reduce the resistance of the airflow generated by the motor when passing through the middle cover, axle box, and protective cover, thereby reducing the loss of airflow energy, improving heat dissipation efficiency, and ensuring that the temperature at the holding position of the power tool is not too high and hot to the hand, while reducing the temperature of the bearing and increasing the bearing life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the utility model

[0017] Figure 2 This is a schematic diagram of the internal structure of the utility model

[0018] Figure 3 This is a structural diagram of the local position of the utility model

[0019] Figure 4 This is a structural diagram of the first embodiment of the multi-point support bone in the utility model.

[0020] Figure 5 This is a structural diagram of the second embodiment of the multi-point support bone in the utility model.

[0021] Figure 6 This is a structural diagram of the third embodiment of the multi-point support bone in the utility model.

[0022] Figure 7 This is a structural diagram of the fourth embodiment of the multi-point support bone in the utility model.

[0023] Figure 8This is a structural diagram of the fifth embodiment of the multi-point support bone in the utility model.

[0024] Fig. 9 This is a structural diagram of the sixth embodiment of the multi-point support bone in the utility model.

[0025] In the figure, 1-protective sleeve, 2-axle box, 21-air duct one, 211-side air outlet, 212-front air outlet, 22-output shaft, 23-bearing two, 3-middle cover, 31-air hole, 32-bearing one, 33-wind guide slope, 4-stator and rotor assembly, 5-fan, 51-wind shield ring, 6-air duct two, 7-multi-point support frame position, 71-air guide block one, 72-air guide block two, 73-air guide block three, 74-air guide block four, 75-air guide block five, 76-air guide block six, 77-air guide block seven, 78-air guide block eight, 79-air guide block nine, 791-air guide block ten. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The following is combined with the embodiments and attached Figures 1 to 9 , the technical solution of the utility model is further elaborated.

[0029] Example 1

[0030] A heat dissipation structure of an electric tool comprises: a protective cover 1 and an axle box 2, an intermediate cover 3, a stator and rotor assembly 4 and a fan 5 which are sequentially arranged to the right inside the protective cover 1, the intermediate cover 3 is provided with an air hole 31, the air hole 31 is connected to an air duct 21 at the right end of the axle box 2, a side air port 211 outside the air duct 21 passes through to the outside of the protective cover 1, a front air port 212 on the left side of the air duct 21 is connected to an air duct 2 6 between the protective cover 1 and the axle box 2, the axle box 2 is provided with a multi-point support frame 7, and the multi-point support frame 7 is provided with an air guide transition surface.

[0031] like Figures 1 to 3 As shown, the airflow generated by the rotation of the fan 5 flows at high speed to the side and the left front under the restriction of the wind shield 51, taking away the heat of the motor, and using this airflow to dissipate the heat of the axle box 2 of the electric grinder. The forward airflow is divided into two parts by the axle box 2 through the air holes 31 of the middle cover 3. One part is blown out by the side air outlets 211 of the axle box 2 and the middle cover 3, taking away the heat generated by the bearing 1 32 positioned on the middle cover 3, and part of the heat of the axle box 2; the other part of the airflow passes through the front air outlet 212 of the axle box 2 to reach the air duct 2 6 between the protective sleeve 1 and the axle box 2, dissipates the heat of the axle box 2, and takes away the heat generated by the bearing 2 23 supporting the output shaft 22 in the axle box 2. The multi-point support frame with the wind guide transition surface avoids forcibly deflecting the rotating airflow into axial airflow, reducing the energy loss of the airflow, thereby cooling the working structure of the main engine, thereby achieving the purpose of increasing the life of the bearings and preventing burns.

[0032] As a further preferred embodiment, the side air vent 211 is tilted toward the left and outward, and the front air vent 212 is tilted toward the left and inward. The side air vent 211 formed by the middle cover 3 and the axle box 2 has an inner side with an inclined surface along the airflow direction, so that the airflow can be smoothly blown out to the outside of the protective cover 1 to reduce wind resistance; the front air vent 212 on the axle box 2 is tilted toward the front along the airflow direction to reduce wind resistance under the premise of ensuring the structure of the demoulding.

[0033] As a further preferred embodiment, four groups of air holes 31 are arranged at intervals on the middle cover 3, and an air guide slope 33 is provided on the side of the air hole 31 along the outflow of the air flow. By reducing the width of the rib position at the air hole 31 of the middle cover 3, the area of ​​the air hole 31 is increased as much as possible, and the air guide slope 33 along the outflow of the air flow at this rib position has a smooth transition to reduce wind resistance.

[0034] As a further preferred embodiment, the cross section of the multi-point support bone 7 is a teardrop-shaped, shuttle-shaped, runway-shaped or circular low wind resistance shape. Multi-point support is adopted between the axle box 2 and the protective sleeve 1. This structure avoids forcibly deflecting the rotating airflow into axial airflow, reducing airflow energy loss; in addition, the cross section of the support point is designed to be a teardrop-shaped, shuttle-shaped, runway-shaped or circular low wind resistance shape, which reduces the energy of the airflow when passing through the support bone and takes away the heat of the axle box.

[0035] As a further preferred embodiment, Figure 4 As shown, the multi-point support frame 7 includes an air guide block 1 71 and an air guide block 2 72 which are arranged in sequence to the right at intervals. The right end cross-section of the air guide block 1 71 is semicircular, and the cross-section of the air guide block 2 72 is teardrop-shaped. The head of the teardrop-shaped air guide block 2 72 is arranged to the left.

[0036] As a further preferred embodiment, Figure 5As shown, the multi-point support frame 7 includes an air guide block three 73 and air guide blocks four 74 arranged in sequence to the right at intervals. The right end cross-section of the air guide block three 73 is a teardrop-shaped head, and the cross-section of the air guide block four 74 is a teardrop-shaped head, and the teardrop-shaped head of the air guide block four 74 is arranged to the right.

[0037] As a further preferred embodiment, Figure 6 As shown, the multi-point support frame 7 includes a fifth air guide block 75 and six air guide blocks 76 which are sequentially arranged to the right at intervals. The cross-section of the right end of the fifth air guide block 75 is semicircular, and the cross-section of the sixth air guide block 76 is runway-shaped.

[0038] As a further preferred embodiment, Figure 7 As shown, the multi-point support frame 7 includes an air guide block seven 77 and air guide blocks eight 78 arranged in sequence to the right at intervals. The right end cross-section of the air guide block seven 77 is conical, and the cross-section of the air guide block eight 78 is shuttle-shaped.

[0039] As a further preferred embodiment, Figure 8 As shown, the multi-point support frame 7 includes an air guide block nine 79 and air guide blocks ten 791 arranged in sequence to the right at intervals. The cross-section of the right end of the air guide block nine 79 is semicircular, and the cross-section of the air guide block ten 791 is circular.

[0040] As a further preferred embodiment, Fig. 9 As shown, the multi-point support frame 7 is arranged obliquely along the airflow direction to further reduce the airflow resistance.

[0041] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A heat dissipation structure for an electric tool, characterized in that: include: A protective sleeve and an axle box, an intermediate cover, a stator and rotor assembly and a fan are sequentially arranged inside the protective sleeve to the right, the intermediate cover is provided with an air hole, the air hole is connected to air duct one at the right end of the axle box, the side air outlet outside the air duct one passes through to the outside of the protective sleeve, the front air outlet on the left side of the air duct one is connected to air duct two between the protective sleeve and the axle box, the axle box is provided with multi-point support bone positions, and the multi-point support bone positions are provided with an air guide transition surface.

2. The heat dissipation structure of an electric tool according to claim 1, characterized in that: The side air vents are arranged to be inclined toward the left side and outward, and the front air vents are arranged to be inclined toward the left side and inward.

3. The heat dissipation structure of an electric tool according to claim 1, characterized in that: Four groups of air holes are arranged at intervals on the middle cover, and an air guiding inclined surface is arranged on one side of the air hole along which the air flows out.

4. The heat dissipation structure of an electric tool according to claim 1, characterized in that: The cross-section of the multi-point support frame is in a teardrop shape, a shuttle shape, a runway shape or a circular low wind resistance shape.

5. The heat dissipation structure of an electric tool according to claim 4, characterized in that: The multi-point support frame includes an air guide block 1 and an air guide block 2 which are arranged in sequence to the right at intervals. The right end cross-section of the air guide block 1 is semicircular, and the cross-section of the air guide block 2 is teardrop-shaped. The head of the teardrop-shaped air guide block 2 is arranged to the left.

6. The heat dissipation structure of an electric tool according to claim 4, characterized in that: The multi-point support frame includes an air guide block three and an air guide block four which are arranged to the right in sequence and at intervals. The right end cross-section of the air guide block three is a teardrop-shaped head. The cross-section of the air guide block four is a teardrop-shaped head. The teardrop-shaped head of the air guide block four is arranged to the right.

7. The heat dissipation structure of an electric tool according to claim 4, characterized in that: The multi-point support frame includes an air guide block five and an air guide block six which are arranged in sequence to the right at intervals. The cross section of the right end of the air guide block five is semicircular, and the cross section of the air guide block six is ​​runway-shaped.

8. The heat dissipation structure of an electric tool according to claim 4, characterized in that: The multi-point support frame includes an air guide block seven and an air guide block eight which are sequentially arranged to the right at intervals. The right end section of the air guide block seven is conical, and the cross section of the air guide block eight is shuttle-shaped.

9. The heat dissipation structure of an electric tool according to claim 4, characterized in that: The multi-point support frame includes an air guide block nine and air guide blocks ten which are arranged in sequence to the right at intervals. The cross section of the right end of the air guide block nine is semicircular, and the cross section of the air guide block ten is circular.

10. A heat dissipation structure for an electric tool according to any one of claims 5 to 9, characterized in that: The multi-point support frame is arranged obliquely along the airflow direction.

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