Motor dustproof structure of novel electric tool

Abstract

The utility model relates to the technical field of electric tools, in particular to a novel motor dustproof structure of an electric tool. A rotor assembly; the dustproof parts are arranged at the two ends of a stator in the stator assembly, and first sealing parts are arranged at the ends, not in contact with the stator, of the dustproof parts; the heat dissipation piece is arranged on one side, close to the cooling end, of the rotor and comprises a heat dissipation head part and a heat conduction tail part which are connected with each other; the heat conduction tail part penetrates through the dustproof part and is connected with the rotor, so that the heat dissipation head part is connected with the first sealing part; and the second sealing piece is arranged between the motor end and the dustproof piece close to the motor end. According to the motor dustproof structure of the novel electric tool, the first sealing piece and the second sealing piece are arranged between the stator assembly and the two ends of the electric tool shell assembly respectively, metal powder can be isolated from the motor, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a novel motor dust-proof structure of an electric tool. Background Art

[0002] Power tools are tools that drive motors to rotate to output power to achieve work, and are widely used in harsh environments full of dust and metal powder;

[0003] The heat generated by the motor itself needs to be dissipated. Currently, the heat dissipation structure of motors on the market is basically open. Therefore, dust and metal powder in the working environment can pass through the gap between the rotor and the stator. Long-term use can easily cause the gap between the rotor and the stator to be blocked, increasing friction or jamming the rotor, reducing the service life of the motor or directly damaging it.

[0004] Especially with the widespread use of brushless motor technology, in the metal powder working environment, the magnets on the rotor absorb the metal powder, which is more likely to cause blockage between the motors and cause damage to the motors. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art and provide a new motor dustproof structure for electric tools, including:

[0006] The stator assembly is fixedly arranged in the housing assembly of the electric tool;

[0007] A rotor assembly, which passes through the stator assembly and is connected to two ends of the power tool housing assembly, wherein the rotor assembly includes a shaft and a rotor, and the two ends of the power tool housing assembly are respectively a cooling end with a fan blade and a motor end with a motor;

[0008] A dustproof member is provided at both ends of the stator in the stator assembly, and a first sealing member is provided at one end of the dustproof member that is not in contact with the stator;

[0009] A heat sink is provided on a side of the rotor close to the cooling end, and comprises a heat sink head and a heat conduction tail connected to each other; the heat conduction tail penetrates the dustproof member and is connected to the rotor, so that the heat sink head is connected to the first sealing member;

[0010] The second sealing member is arranged between the motor end and the dustproof member close to the motor end.

[0011] Furthermore, the stator assembly is provided with a plurality of stator punching sheets, and the inner wall ring of the stator punching sheet is provided with a plurality of positioning grooves, and each of the positioning grooves is inserted with a slot wedge matching the positioning groove so that the inner wall of the stator punching sheet forms a closed ring, and slot wedge bosses are provided at both ends of the slot wedge, and the direction of the slot wedge bosses is away from the inner wall direction of the stator punching sheet.

[0012] Furthermore, the dustproof part is a stator assembly buckle plate cover, the end of the dustproof part that does not contact the stator assembly is a first plate surface, a circle of conical bosses is arranged on the first plate surface, and the conical bosses are first sealing parts.

[0013] Furthermore, a buckle plate cover slot is provided on the conical boss at a position corresponding to the positioning slot, the shape of the buckle plate cover slot matches the slot wedge boss, and the slot wedge boss is engaged with the buckle plate cover slot to fix the dustproof part to the stator assembly.

[0014] Furthermore, the heat dissipation head and the heat dissipation tail are cylindrical, and a hollow portion is provided through the axis of the heat dissipation element, and the diameter of the hollow portion matches the diameter of the axis; the diameter of the heat dissipation head is larger than the diameter of the heat dissipation tail, and the distance between the heat dissipation head and the first plate surface is equal to the thickness of the first seal.

[0015] Furthermore, the heat sink is made of metal.

[0016] Furthermore, the second sealing member is a rubber member, one end of the second sealing member is tightly fitted with the dustproof member close to the motor end, and the other end of the second sealing member is tightly fitted with the bearing hole boss of the motor end.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. The utility model discloses a novel motor dustproof structure for an electric tool, wherein a first seal and a second seal are respectively arranged between the stator assembly and the two ends of the electric tool housing assembly, which can isolate metal powder from the motor and extend the service life of the motor.

[0019] 2. The utility model provides a new type of electric tool with a motor dustproof structure in which a heat sink is provided on one side of the rotor close to the cooling end. The heat generated by the rotor assembly in the closed space is transferred to the heat sink. The fan blades at the cooling end form air volume to take away the heat transferred to the heat sink, thereby dissipating the heat of the rotor assembly and achieving heat dissipation while sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 It is a schematic diagram of a novel motor dust-proof structure of an electric tool of the utility model;

[0022] Figure 2 This is a cross-sectional view of a novel motor dust-proof structure of an electric tool according to the utility model;

[0023] Figure 3 It is a partial cross-sectional view of a motor dustproof structure of a new type of electric tool of the utility model;

[0024] Figure 4 This is a schematic diagram of a stator punching sheet of a motor dust-proof structure of a novel electric tool of the utility model;

[0025] Figure 5 This is a schematic diagram of a first sealing member of a motor dustproof structure of a novel electric tool of the utility model;

[0026] Figure 6 This is a schematic diagram of a second sealing member of a motor dustproof structure of a novel electric tool of the utility model;

[0027] Figure 7 A schematic diagram of a dustproof member of a motor dustproof structure of a novel electric tool according to the utility model;

[0028] Figure 8 The utility model is a schematic diagram of a groove wedge of a motor dust-proof structure of a new type of electric tool.

[0029] Reference numerals

[0030] 1: Power tool housing assembly;

[0031] 11: cooling end; 12: motor end;

[0032] 2: stator assembly;

[0033] 21: stator punching sheet; 22: positioning groove; 23: slot wedge; 24: slot wedge boss;

[0034] 3: Rotor assembly;

[0035] 31: shaft; 32: rotor; 33: rotor lower end cover;

[0036] 4: Dustproof parts;

[0037] 41: first plate surface; 42: first sealing member; 43: buckle plate cover slot;

[0038] 5: Heat sink;

[0039] 51: heat dissipation head; 52: heat conduction tail;

[0040] 6: Second seal. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the utility model and are not used to limit the utility model.

[0042] Example 1

[0043] See also Figure 1-8 The technical solution of a novel motor dust-proof structure of an electric tool provided in this embodiment includes the following:

[0044] The stator assembly 2 is fixedly arranged in the power tool housing assembly 1;

[0045] A rotor assembly 3, which penetrates the stator assembly 2 and is connected to two ends of the power tool housing assembly 1, wherein the rotor assembly 3 includes a shaft 31 and a rotor 32, and the two ends of the power tool housing assembly 1 are respectively a cooling end 11 provided with a fan blade and a motor end 12 provided with a motor;

[0046] A dustproof member 4 is provided at both ends of the stator in the stator assembly 2, and a first sealing member 42 is provided at one end of the dustproof member 4 that is not in contact with the stator;

[0047] The heat sink 5 is disposed on a side of the rotor 32 close to the cooling end 11, and includes a heat sink head 51 and a heat conduction tail 52 connected to each other; the heat conduction tail 52 penetrates the dustproof member 4 and connects with the rotor 32, so that the heat sink head 51 is connected with the first sealing member 42;

[0048] The second sealing member 6 is disposed between the motor end 12 and the dustproof member 4 close to the motor end 12 .

[0049] In the specific implementation, the power tool housing assembly 1 includes a housing, a motor, a fan blade and other components, and its specific installation and connection methods are prior art, which will not be described in detail in this embodiment. The focus of this design protection is the sealing and dustproof structure between the motor and the power tool housing assembly 1.

[0050] Preferably, the stator assembly 2 is the stationary part of the electric tool, mainly composed of a stator core, a stator winding wound on the stator core, a machine base and other parts, and the stator punching 21 is generally installed in the core part of the stator assembly 2. The stator core is an important part of the motor magnetic circuit, and is usually formed by stacking stator punchings 21 to form the overall structure of the motor stator core. In order to make the stator punchings 21 fit firmly, the inner wall of the stator punching 21 is provided with a plurality of positioning grooves 22, and each of the positioning grooves 22 is inserted with a slot wedge 23 matching the positioning groove 22, so that the inner wall of the stator punching 21 forms a closed loop.

[0051] Preferably, in order to fix the dustproof parts 4 at both ends of the stator assembly 2 in this design, the two ends of the groove wedge 23 are provided with groove wedge bosses 24 for fixing the dustproof parts 4, and the direction of the groove wedge bosses 24 is away from the inner wall direction of the stator punching sheet 21.

[0052] Specifically, the dustproof member 4 is a stator assembly buckle plate cover, and the end of the dustproof member 4 that does not contact the stator assembly 2 is a first plate surface 41 , and a circle of conical bosses is arranged on the first plate surface 41 , and the conical bosses are first sealing members 42 .

[0053] Specifically, a buckle plate cover slot 43 is provided on the conical boss at a position corresponding to the positioning slot 22, and the shape of the buckle plate cover slot 43 matches the slot wedge boss 24, and the slot wedge boss 24 is engaged with the buckle plate cover slot 43 to fix the dustproof part 4 to the stator assembly 2.

[0054] In a specific implementation, both ends of the groove wedge 23 extend from the inner circle of the dustproof component 4, and the groove wedge boss 24 is snapped into the buckle plate cover slot 43 to achieve a fixed connection. In order to further achieve sealing, in a specific implementation, the outer end surface of the groove wedge boss 24 after snap connection can be flush with the outer end surface of the first sealing component 42.

[0055] Specifically, the heat dissipation head 51 and the heat dissipation tail are cylindrical, and a hollow portion is provided through the axis of the heat dissipation element 5, and the diameter of the hollow portion matches the diameter of the shaft 31; the diameter of the heat dissipation head 51 is larger than the diameter of the heat dissipation tail, and the distance between the heat dissipation head 51 and the first plate surface 41 is equal to the thickness of the first sealing member 42. A rotor lower end cover 33 is also provided on the side of the rotor 32 close to the motor end 12.

[0056] Preferably, as attached Figure 5 As shown, the distance between the heat dissipation head 51 and the first plate surface 41 is a gap D, and the gap D is reserved between 0.5-1.5 mm; the first sealing member 42 on the dustproof member 4 matches with it, thereby forming a first closed end;

[0057] Preferably, in order to enhance the heat dissipation effect, the heat sink 5 is made of metal. The heat generated in the closed space when the rotor assembly 3 is working can be transferred to the heat sink 5. The wind blades form air volume to take away the heat transferred to the heat sink 5, thereby forming heat dissipation. In a specific implementation, the larger the heat dissipation head 51, the better the heat dissipation.

[0058] Specifically, the second sealing member 6 is a rubber member, one end of which is tightly fitted with the dustproof member 4 close to the motor end 12, and the other end of the second sealing member 6 is tightly fitted with the bearing hole boss of the motor end 12, thereby forming a second sealing end, and the first closed end is combined with the second sealing end to achieve dustproofing of the motor in the power tool.

[0059] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A novel motor dust-proof structure for an electric tool, characterized in that: include: The stator assembly is fixedly arranged in the housing assembly of the electric tool; A rotor assembly, which passes through the stator assembly and is connected to two ends of the power tool housing assembly, wherein the rotor assembly includes a shaft and a rotor, and the two ends of the power tool housing assembly are respectively a cooling end with a fan blade and a motor end with a motor; A dustproof member is provided at both ends of the stator in the stator assembly, and a first sealing member is provided at one end of the dustproof member that is not in contact with the stator; A heat sink is provided on a side of the rotor close to the cooling end, and comprises a heat sink head and a heat conduction tail connected to each other; the heat conduction tail penetrates the dustproof member and is connected to the rotor, so that the heat sink head is connected to the first sealing member; The second sealing member is arranged between the motor end and the dustproof member close to the motor end.

2. The novel motor dust-proof structure of the electric tool according to claim 1 is characterized in that: The stator assembly is provided with a plurality of stator punching sheets, and the inner wall ring of the stator punching sheet is provided with a plurality of positioning grooves. A slot wedge matching the positioning groove is inserted into each of the positioning grooves so that the inner wall of the stator punching sheet forms a closed ring. Slot wedge bosses are provided at both ends of the slot wedge, and the direction of the slot wedge bosses is away from the inner wall direction of the stator punching sheet.

3. The novel motor dust-proof structure of the electric tool according to claim 2 is characterized in that: The dustproof part is a stator assembly buckle plate cover, and the end of the dustproof part that does not contact the stator assembly is a first plate surface. A circle of conical bosses is arranged on the first plate surface, and the conical bosses are first sealing parts.

4. The novel motor dust-proof structure of the electric tool according to claim 3 is characterized in that: A gusset plate cover slot is provided on the conical boss at a position corresponding to the positioning slot, the shape of the gusset plate cover slot matches the slot wedge boss, and the slot wedge boss is engaged with the gusset plate cover slot to fix the dustproof part to the stator assembly.

5. The novel motor dust-proof structure of the electric tool according to claim 3 is characterized in that: The heat dissipation head and the heat dissipation tail are cylindrical, and a hollow portion is provided through the axis of the heat dissipation element, and the diameter of the hollow portion matches the diameter of the axis; the diameter of the heat dissipation head is larger than the diameter of the heat dissipation tail, and the distance between the heat dissipation head and the first plate surface is equal to the thickness of the first seal.

6. The novel motor dust-proof structure of the electric tool according to claim 3 is characterized in that: The heat sink is made of metal.

7. The novel motor dust-proof structure of the electric tool according to claim 1 is characterized in that: The second sealing member is a rubber member, one end of which is tightly fitted with the dustproof member close to the motor end, and the other end of which is tightly fitted with the bearing hole boss of the motor end.

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