Triple wind path structure for electric tool

Abstract

The utility model relates to the technical field of electric tools, in particular to a triple wind path structure for an electric tool, which comprises a casing, a stator, a rotor, a holding aluminum casing, a holding plastic casing and a working head, the stator and the rotor are arranged in the casing, and the stator is sleeved on the rotor; a rotor cooling air duct is arranged between the stator and the rotor, a stator coil cooling air duct and a stator outer ring cooling air duct are arranged between the stator and the machine shell, the holding aluminum shell is arranged in the holding plastic shell, a holding aluminum shell cooling air duct is arranged between the holding aluminum shell and the holding plastic shell, a first air inlet is formed in the tail portion of the machine shell, and a second air inlet is formed in the tail portion of the machine shell. A second air inlet is formed in the casing on the outer side of the tail part of the rotor, a third air inlet is formed in the holding aluminum casing, and an air outlet is formed in the head part of the casing. According to the utility model, the rotor heat dissipation and exhaust channel is arranged between the rotor and the stator, the stator heat dissipation and exhaust channel is arranged between the casing and the stator, and the two air channels operate independently, so that the stator and the rotor in the electric tool can be cooled respectively, and the heat dissipation effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a triple air path structure used for electric tools. Background Art

[0002] In the prior art electric tools, especially brushless electric grinders, the stator and rotor share a heat dissipation and exhaust duct, or the rotor is closed and the heat dissipation and exhaust duct only cools the stator. The clearance between the outer ring of the stator and the housing is small and cannot be effectively cooled. When the housing is used under heavy load, the motor heats up and the housing becomes hot, making it impossible to hold and use it normally. The main body of the grip of the electric grinder head is made of aluminum, and the high-speed operation of the internal bearings easily generates high temperatures. In summer, when the outdoor temperature is greater than 35 degrees, the temperature of the housing grip and the electric grinder head grip is as high as about 50 degrees when the electric grinder is in use. Workers cannot hold it for a long time during operation.

[0003] The main defects of this power tool are as follows:

[0004] (1) For power tools whose stator and rotor share a heat dissipation and exhaust duct, once the metal grinding wheel enters the heat dissipation and exhaust duct, it will be adsorbed on the rotor surface by the rotor with strong magnetism and quickly fill the air gap between the stator and rotor, causing the tool to be damaged and unusable.

[0005] (2) The rotor is closed, and the heat dissipation and exhaust duct only cools the stator. Although the electric tool isolates the problem of metal grinding entering the rotor, because the rotor cannot be cooled, the magnetic steel inside the rotor will demagnetize due to high temperature, causing the tool to be damaged and unusable.

[0006] (3) The clearance between the stator outer ring and the housing is less than 2mm, which cannot be effectively cooled. When the housing is held by hand and used under heavy load, the motor heats up and causes the housing to become hot. In summer, when the outdoor temperature is greater than 35 degrees, the temperature of the housing holding part of the electric grinder can reach about 50 degrees when in use. Workers cannot hold it for a long time during operation.

[0007] (4) The main body of the electric grinder head grip is made of aluminum. The internal bearings are prone to high temperatures due to high-speed operation. In summer, when the outdoor temperature is greater than 35 degrees, the temperature of the casing grip and the electric grinder head grip can reach about 50 degrees when the electric grinder is in use. Workers cannot hold it for a long time during operation. Utility Model Content

[0008] The purpose of the utility model is to provide a triple air duct structure for an electric tool to solve the problems raised in the above background technology.

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a triple air duct structure for an electric tool, comprising a casing, a stator, a rotor, a gripping aluminum shell, a gripping plastic shell, and a working head, wherein the stator and the rotor are arranged in the casing, and the stator sleeve is arranged on the rotor; a rotor cooling air duct is arranged between the stator and the rotor, a stator coil cooling air duct and a stator outer ring cooling air duct are arranged between the stator and the casing, the gripping aluminum shell is arranged in the gripping plastic shell, and a gripping aluminum shell cooling air duct is arranged between the gripping aluminum shell and the gripping plastic shell, a first air inlet is arranged at the rear of the casing, a second air inlet is arranged on the casing outside the rear of the rotor, a third air inlet is arranged on the gripping aluminum shell, and the machine The head of the shell is provided with an exhaust port, the outer ring of the middle cover is provided with an exhaust port, and the small end of the holding aluminum shell is provided with an exhaust port. The first air inlet is connected to the stator coil cooling air duct and the stator outer ring cooling air duct, the second air inlet is connected to the rotor cooling air duct, and the third air inlet is connected to the stator outer ring cooling air duct. The stator coil cooling air duct, the stator outer ring cooling air duct and the rotor cooling air duct are all connected to the exhaust port. The rotor in the middle cover is sleeved with a large fan blade, the upper end of the rotor is fixed with a coupling, the upper end of the coupling is fixed with an output shaft, a bearing 2 is sleeved between the output shaft and the holding plastic shell, and a steel sleeve is sleeved between the top of the output shaft and the holding plastic shell.

[0010] Preferably, the second air inlet is connected to the rotor cooling air duct through an air inlet channel, a magnetic bar is arranged in the air inlet channel, and a mesh edge cover is provided at the second air inlet.

[0011] Preferably, the tail of the rotor is installed in a bearing chamber in the casing through a bearing 1, and the rear of the bearing chamber is sealed by a rear cover.

[0012] Preferably, the outer side of the bearing chamber is covered by a circular thin-walled part, the air inlet channel is connected to the inside of the circular thin-walled part, the inside of the circular thin-walled part is connected to the rotor cooling air duct, and the rear end of the stator end plate is tightly matched with the front end of the circular thin-walled part.

[0013] Preferably, grooves are arranged at intervals along the circumference of the front end of the circular thin-walled member, and bosses are arranged at intervals along the circumference of the rear end of the stator end plate, and the bosses are inserted into the grooves.

[0014] Preferably, a small fan blade is installed on the rotor in front of the bearing chamber, and two second air inlets are provided, which are symmetrically arranged on the outside of the bearing chamber.

[0015] Preferably, a power supply and a control board are provided in the casing at the rear side of the stator and the rotor, and the first air inlet is connected to the stator coil cooling air duct and the stator outer ring cooling air duct through the rear space of the casing.

[0016] Preferably, the inner wall of the holding plastic shell has eight convex ribs, and after the holding aluminum shell is installed, it is tightly matched with the outer circle of the holding aluminum shell and the eight convex ribs, and the eight gaps formed in the middle are cooling air ducts for the holding aluminum shell.

[0017] Preferably, the casing part and the holding aluminum shell part are connected by an intermediate cover, and the stator outer ring cooling air duct enters the holding aluminum shell air inlet through the intermediate cover and enters the holding aluminum shell cooling air duct, and the cooling air is discharged from the side of the working head.

[0018] Preferably, the inner ring of the stator is provided with stator slots along its circumference, stator slot fibers are inserted into the stator slots, and the stator slot fibers, the stator slots and the outer wall of the rotor form a rotor cooling air duct.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. The utility model sets a rotor heat dissipation and exhaust channel between the rotor and the stator, and sets a stator heat dissipation and exhaust channel between the casing and the stator. The two air ducts operate independently, and the stator and the rotor in the power tool can be cooled separately, with good heat dissipation effect.

[0021] 2. The utility model is provided with a magnetic bar in the channel and a stainless steel mesh cover for filtering at the air inlet, so that the fine iron grinding entering the machine rotor can be automatically adsorbed by the magnetic bar, which greatly improves the operating environment of the rotor, effectively avoids damage caused by the strong magnetic rotor adsorbing the iron grinding, and can greatly improve the life of the whole machine.

[0022] 3. The casing part and the holding aluminum shell part of the utility model are connected by a middle cover. The cooling wind of the stator outer ring enters the holding aluminum shell cooling air duct from the holding aluminum shell air inlet through the middle cover to cool the holding aluminum shell, so that the temperature of the holding plastic shell rises below 45 degrees that the human body can withstand, and workers can hold it for a long time during operation.

[0023] 4. The casing and stator of the utility model cooperate to form a stator outer ring cooling air duct. The cooling air enters the stator outer ring cooling air duct to cool the stator. When the machine is used under heavy load, the casing temperature rises to below 45 degrees that the human body can withstand. Workers can hold it for a long time during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural sectional view of the utility model;

[0026] Figure 2 It is another structural sectional view of the utility model;

[0027] Figure 3 It is another structural sectional view of the utility model;

[0028] Figure 4 It is a structural stereogram of the utility model;

[0029] Figure 5 It is a cross-sectional view of the AA structure of the utility model;

[0030] Figure 6 It is a sectional view of the BB structure of the utility model;

[0031] Figure 7 yes Figure 1 Enlarged view of species A; Figure 8 yes Figure 2 Enlarged view of species B;

[0032] Fig. 9 It is a structural schematic diagram of the stator in the utility model; Fig.10 It is a structural schematic diagram of the rotor in the utility model; Fig.11 It is a partial cross-sectional view of the casing of the utility model;

[0033] Fig.12 It is an assembly structure diagram of the stator and the casing in the utility model.

[0034] Fig.13 This is a schematic diagram of the structure of the aluminum shell in the utility model.

[0035] Fig.14 It is a structural schematic diagram of the grip plastic shell in the utility model.

[0036] Description of reference numerals:

[0037] 1. Casing; 2. Stator; 3. Rotor; 4. Rotor cooling air duct; 5. Stator coil cooling air duct; 6. First air inlet; 7. Second air inlet; 8. Exhaust outlet; 9. Air inlet channel; 10. Magnetic bar; 11. Mesh cover; 12. Bearing 1; 13. Bearing chamber; 14. Back cover; 15. Round thin-walled part; 16. Stator end plate; 17. Groove; 18. Boss; 19. Small fan blade; 20. Power supply; 21. Control panel; 22. Stator slot; 23. Stator slot fiber; 24. Large fan blade; 25. Middle cover; 26. Holding aluminum shell; 27. Coupling; 28. Holding plastic shell; 29. ​​Output shaft; 30. Bearing 2; 31. Steel sleeve; 32. Working head; 33. Stator outer ring cooling air duct; 34. Holding aluminum shell cooling air duct; 35. Third air inlet; 36. Convex rib. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] See also Figures 1 to 14 , the utility model provides a technical solution:

[0040] A triple air duct structure for an electric tool, comprising a casing 1, a stator 2, a rotor 3, a gripping aluminum shell 26, a gripping plastic shell 28, and a working head 32, wherein the stator 2 and the rotor 3 are arranged in the casing 1, and the stator 2 is sleeved on the rotor 3; a rotor cooling air duct 4 is arranged between the stator 2 and the rotor 3, a stator coil cooling air duct 5 and a stator outer ring cooling air duct 33 are arranged between the stator 2 and the casing 1, the gripping aluminum shell 26 is arranged in the gripping plastic shell 28, a gripping aluminum shell cooling air duct 34 is arranged between the gripping aluminum shell 26 and the gripping plastic shell 28, a first air inlet 6 is arranged at the rear of the casing 1, a second air inlet 7 is arranged on the casing 1 outside the rear of the rotor 3, a third air inlet 35 is arranged on the gripping aluminum shell 26, an exhaust port 8 is arranged at the head of the casing 1, and a middle An exhaust port 8 is provided on the outer ring of the cover 25, and an exhaust port 8 is provided on the small end of the holding aluminum shell 26. The first air inlet 6 is connected to the stator coil cooling air duct 5 and the stator outer ring cooling air duct 33, the second air inlet 7 is connected to the rotor cooling air duct 4, and the third air inlet 35 is connected to the stator outer ring cooling air duct 33. The stator coil cooling air duct 5, the stator outer ring cooling air duct 33 and the rotor cooling air duct 4 are all connected to the exhaust port 8. The rotor 3 in the middle cover 25 is sleeved and fixed with a large fan blade 24, and a coupling 27 is fixed on the upper end of the rotor 3, and an output shaft 29 is fixed on the upper end of the coupling 27. A bearing 2 30 is sleeved between the output shaft 29 and the holding plastic shell 28, and a steel sleeve 31 is sleeved between the top of the output shaft 29 and the holding plastic shell 28.

[0041] The second air inlet 7 is connected to the rotor cooling air duct 4 through the air inlet channel 9. A magnetic rod 10 is arranged in the air inlet channel 9. A mesh cover 11 is provided at the second air inlet 7. The mesh cover 11 can prevent larger impurities. In the embodiment of the present application, two second air inlets 7 are provided, which are symmetrically arranged on the outside of the bearing 13. The entire rotor cooling air path has a T-shaped structure, which improves the cooling effect. The power supply 20 and the control board 21 in the power tool are in the casing 1 on the rear side of the stator 2 and the rotor 3, so the airflow entering from the first air inlet 6 will first pass through the space of the casing 1 where the power supply 20 and the control board 21 are located, and then enter the stator cooling air duct 5. Therefore,

[0042] Components such as the power supply 20 and the control board 21 can also be cooled.

[0043] The magnetic rod 10 can absorb the iron filings during the use of the power tool to prevent them from entering the interior and affecting the stator 2 and the rotor 3, greatly improving the operating environment of the rotor 3, effectively avoiding damage caused by the strong magnetic rotor 3 adsorbing iron grinding, and greatly improving the life of the whole machine.

[0044] The connection is made in an unloading manner, mainly to facilitate the cleaning of adsorbed impurities.

[0045] The tail of the rotor 3 is installed in a bearing chamber 13 in the housing 1 through a bearing 12, and the rear of the bearing chamber 13 is sealed by a rear cover 14, and the rear cover 14 is made of silicone.

[0046] The outer side of the bearing chamber 13 is covered by a circular thin-walled part 15, the air inlet channel 9 is connected to the inside of the circular thin-walled part 15, the inside of the circular thin-walled part 15 is connected to the rotor cooling air duct 4, the rear end of the stator end plate 16 is tightly matched with the front end of the circular thin-walled part 15, and the air flow enters the air inlet channel 9 from the second air inlet 7 and then enters the inside of the circular thin-walled part 15, and then passes through the rotor cooling air duct 4 and is discharged from the exhaust port.

[0047] The front end of the circular thin-walled member 15 is provided with grooves 17 at intervals along its circumferential direction, and the rear end of the stator end plate 16 is provided with bosses 18 at intervals along its circumferential direction, and the bosses 18 are inserted into the grooves 17 .

[0048] A small fan blade 19 is installed on the rotor 3 in front of the bearing chamber 13 , and two second air inlets 7 are provided, which are symmetrically arranged on the outside of the bearing chamber 13 .

[0049] A power supply 20 and a control board 21 are arranged in the casing 1 at the rear side of the stator 2 and the rotor 3 , and the first air inlet 6 is connected with the stator coil cooling air duct 5 and the stator outer ring cooling air duct 33 through the rear space of the casing 1 .

[0050] The inner wall of the holding plastic shell 28 has eight convex ribs 36 , and after the holding aluminum shell 26 is inserted, the outer circle of the holding aluminum shell 26 and the eight convex ribs 36 are tightly matched, and the eight gaps formed in the middle are the cooling air ducts 34 of the holding aluminum shell.

[0051] The casing 1 part and the holding aluminum shell 26 part are connected through the middle cover 25, and the stator outer ring cooling air duct 33 enters the holding aluminum shell 26 air inlet through the middle cover 25 and enters the holding aluminum shell cooling air duct 34, and the cooling air is discharged from the side of the working head 32.

[0052] The inner ring of the stator 2 is provided with stator slots 22 along its circumference, and stator slot fibers 23 are inserted into the stator slots 22 . The stator slot fibers 23 , the stator slots 22 and the outer wall of the rotor 3 form a rotor cooling air duct 4 .

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A triple air duct structure for an electric tool, characterized in that: The invention comprises a housing (1), a stator (2), a rotor (3), a holding aluminum shell (26), a holding plastic shell (28), and a working head (32); the stator (2) and the rotor (3) are arranged in the housing (1), and the stator (2) is sleeved on the rotor (3); a rotor cooling air duct (4) is arranged between the stator (2) and the rotor (3), and a stator coil cooling air duct (5) and a stator outer ring cooling air duct (33) are arranged between the stator (2) and the housing (1). ), the holding aluminum shell (26) is arranged in the holding plastic shell (28), a holding aluminum shell cooling air duct (34) is arranged between the holding aluminum shell (26) and the holding plastic shell (28), a first air inlet (6) is arranged at the rear of the housing (1), a second air inlet (7) is arranged on the housing (1) outside the rear of the rotor (3), a third air inlet (35) is arranged on the holding aluminum shell (26), an exhaust port (8) is arranged at the head of the housing (1), and a middle cover (25 ) an outer ring is provided with an exhaust port (8), a small end of the holding aluminum shell (26) is provided with an exhaust port (8), the first air inlet (6) is connected to the stator coil cooling air duct (5) and the stator outer ring cooling air duct (33), the second air inlet (7) is connected to the rotor cooling air duct (4), the third air inlet (35) is connected to the stator outer ring cooling air duct (33), the stator coil cooling air duct (5) and the stator outer ring cooling air duct (33) are connected to the rotor The cooling air ducts (4) are all connected to the exhaust port (8); the rotor (3) in the middle cover (25) is sleeved and fixed with a large fan blade (24); a coupling (27) is fixed to the upper end of the rotor (3); an output shaft (29) is fixed to the upper end of the coupling (27); a bearing 2 (30) is sleeved between the output shaft (29) and the holding plastic shell (28); and a steel sleeve (31) is sleeved between the top of the output shaft (29) and the holding plastic shell (28).

2. A triple air duct structure for an electric tool according to claim 1, characterized in that: The second air inlet (7) is connected to the rotor cooling air duct (4) through an air inlet channel (9), a magnetic bar (10) is arranged in the air inlet channel (9), and a mesh edge cover (11) is provided at the second air inlet (7).

3. A triple air duct structure for an electric tool according to claim 2, characterized in that: The tail of the rotor (3) is installed in a bearing chamber (13) in the casing (1) through a bearing 1 (12), and the rear of the bearing chamber (13) is sealed by a rear cover (14).

4. A triple air duct structure for an electric tool according to claim 3, characterized in that: The outer side of the bearing chamber (13) is covered by a circular thin-walled member (15), the air inlet channel (9) is connected to the inside of the circular thin-walled member (15), the inside of the circular thin-walled member (15) is connected to the rotor cooling air duct (4), and the rear end of the stator end plate (16) is tightly matched with the front end of the circular thin-walled member (15).

5. A triple air duct structure for an electric tool according to claim 4, characterized in that: The front end of the circular thin-walled member (15) is provided with grooves (17) at intervals along its circumference, and the rear end of the stator end plate (16) is provided with bosses (18) at intervals along its circumference, and the bosses (18) are inserted into the grooves (17).

6. A triple air duct structure for an electric tool according to claim 5, characterized in that: A small fan blade (19) is installed on the rotor (3) in front of the bearing chamber (13), and two second air inlets (7) are provided, which are symmetrically arranged on the outside of the bearing chamber (13).

7. A triple air duct structure for an electric tool according to claim 6, characterized in that: A power supply (20) and a control panel (21) are arranged in the casing (1) at the rear side of the stator (2) and the rotor (3), and the first air inlet (6) is connected to the stator coil cooling air duct (5) and the stator outer ring cooling air duct (33) through the rear space of the casing (1).

8. A triple air duct structure for an electric tool according to claim 7, characterized in that: The inner wall of the gripping plastic shell (28) is provided with eight convex ribs (36). After the gripping aluminum shell (26) is inserted, the outer circle of the gripping aluminum shell (26) and the eight convex ribs (36) are tightly matched, and the eight gaps formed in the middle are cooling air ducts (34) for the gripping aluminum shell.

9. A triple air duct structure for an electric tool according to claim 8, characterized in that: The casing (1) part and the holding aluminum shell (26) part are connected through an intermediate cover (25), and the stator outer ring cooling air duct (33) enters the holding aluminum shell (26) air inlet through the intermediate cover (25) and enters the holding aluminum shell cooling air duct (34), and the cooling air is discharged from the side of the working head (32).

10. A triple air duct structure for an electric tool according to claim 9, characterized in that: The inner ring of the stator (2) is provided with stator slots (22) along its circumference, stator slot fibers (23) are inserted into the stator slots (22), and the stator slot fibers (23), the stator slots (22) and the outer wall of the rotor (3) form a rotor cooling air duct (4).

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