CN213783027U

CN213783027U - Fully-sealed permanent magnet brushless motor and electric tool

Info

Publication number: CN213783027U
Application number: CN202023348272.0U
Authority: CN
Inventors: 吴世清; 张丕泉
Original assignee: Yueqing Huiyang Electromechanical Co ltd
Current assignee: Yueqing Huiyang Electromechanical Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-07-23
Anticipated expiration: 2030-12-31

Abstract

The utility model provides a totally enclosed permanent magnet brushless motor and an electric tool, wherein the motor comprises a shell, an upper cover and a sealing ring, and the shell is provided with an installation cavity; the upper cover is buckled at the top of the shell and is provided with a mounting plate which extends into the mounting cavity and is arranged adjacent to the inner wall of the mounting cavity in a forming mode; and the sealing ring is arranged between the outer side surface of the mounting plate and the inner wall of the mounting cavity and is suitable for sealing a gap between the outer side surface of the mounting plate and the inner wall of the mounting cavity. The installation position of the sealing ring is ingeniously changed by the inventor, so that the sealing ring is installed between the outer side surface of the installation plate and the inner wall of the installation cavity of the shell, and a flange for installing the sealing ring is avoided being arranged at the top of the shell, so that the overall dimension of the motor can be smaller, the miniaturization of a product is facilitated, and the cost is reduced; in addition, the upper cover and the shell are spliced to form a straight cylinder, so that wind blown out by the fan cannot be blocked, faster wind speed is guaranteed, quick heat dissipation of the motor is facilitated, and the service life of the motor is prolonged.

Description

Fully-sealed permanent magnet brushless motor and electric tool

Technical Field

The utility model relates to a brushless motor technical field, concretely relates to totally enclosed permanent magnet brushless motor and electric tool.

Background

In electric tools such as a handheld electric drill and the like, a permanent magnet brushless motor is the most main driving equipment, and parts such as a permanent magnet are adopted, so that the permanent magnet brushless motor has magnetism, metal dust in a working environment is easily adsorbed into the motor and accumulated in the motor, the heat dissipation of the motor is influenced, and a circuit short circuit fault is caused; in addition, because metal powder can adsorb on rotor magnet steel, can lead to its unable rotation for the motor is invalid.

In order to maintain the sealing between the motor housing 01 and the upper cover 02, as shown in fig. 6, the top of the housing 01 is provided with a flange 03 protruding outward, the upper surface of the flange 03 is formed with an annular groove 05 into which the sealing ring 04 is fitted, and the upper cover 02 is snap-fitted to the top of the housing 01 to press the sealing ring 04. In order to facilitate the heat dissipation of the motor, as shown in fig. 7 and 8, the motor is installed at the front end of the housing 06, a fan is arranged at the tail end of the housing 06, and air coming out of the fan flows out from the front end of the housing after passing through a gap 07 between the motor and the housing 06 so as to take away the heat of the motor. In practical work, the inventor finds that due to the blocking of the flange 03, the wind speed is slowed down when the wind passes through the flange 03, so that the quick heat dissipation of the motor is not facilitated; in addition, due to the existence of the flange 03, the overall size of the whole motor is larger, and the size of the corresponding housing is also larger, so that the cost is increased.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming among the prior art motor casing and being equipped with the flange, leading to the general defect of radiating effect to a totally enclosed permanent magnet brushless motor that the radiating effect is good is provided, and has this totally enclosed permanent magnet brushless motor's electric tool.

Therefore, the utility model provides a totally enclosed brushless motor, including casing, upper cover and sealing washer. The shell is provided with a mounting cavity; the upper cover is buckled at the top of the shell and is provided with a mounting plate which extends into the mounting cavity and is arranged adjacent to the inner wall of the mounting cavity in a forming mode; and the sealing ring is arranged between the outer side surface of the mounting plate and the inner wall of the mounting cavity and is suitable for sealing a gap between the outer side surface and the inner wall of the mounting cavity.

The middle part of the outer side surface of the mounting plate is provided with an annular groove suitable for mounting the sealing ring.

The lateral surface of mounting panel with the laminating of installation cavity inner wall offsets.

The upper cover and the shell are spliced to form a straight cylinder.

A plurality of first convex ribs are arranged on the outer wall of the shell at intervals.

And a plurality of second convex ribs which are arranged corresponding to the first convex ribs are arranged on the outer wall of the upper cover.

A plurality of first lugs are arranged on the outer wall of the shell at intervals, and a plurality of second lugs corresponding to the first lugs are arranged on the outer wall of the upper cover at intervals.

The motor rotor, the motor stator and the insulating heat conducting liquid are arranged in the mounting cavity, and when the motor runs, heat generated by the rotor is conducted to the shell and/or the upper cover through the heat conducting liquid.

The utility model also provides an electric tool, including the housing, install in the housing front end as above the totally enclosed brushless motor with install in the fan of housing tail end.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a totally enclosed permanent magnet brushless motor, which comprises a housin, upper cover and sealing washer, the upper cover shaping has the mounting panel that stretches into the casing installation cavity, and set up rather than the inner wall is neighbouring, be equipped with the sealing washer between the lateral surface of mounting panel and the inner wall of mounting cavity, the inventor has changed the mounted position of sealing washer ingeniously to avoided setting up the flange that is used for installing the sealing washer at the casing top, makeed the whole overall dimension of motor can set up less, so not only do benefit to the miniaturization of product, still the cost is reduced.

2. The utility model provides a totally enclosed permanent magnet brushless motor, the middle part of mounting panel lateral surface is equipped with the annular groove who is suitable for the installation sealing washer, does benefit to the sealing washer like this and realizes quick installation with the mounting panel, and assembles more firmly.

3. The utility model provides a totally enclosed permanent magnet brushless motor, the lateral surface and the laminating of installation intracavity wall of mounting panel offset to make sealing performance better, prolonged the life of product.

4. The utility model provides a totally enclosed permanent magnet brushless motor, upper cover and casing concatenation form straight tube-shape, and the wind that the fan blew out just can not blockked like this to do benefit to the quick heat dissipation of motor.

5. The utility model provides a totally enclosed permanent magnet brushless motor, the interval is equipped with many first protruding muscle on the outer wall of casing, is equipped with many second protruding muscle that correspond the setting with first protruding muscle on the outer wall of upper cover, through setting up first protruding muscle and the protruding muscle of second, increases motor and external area of contact to improve the radiating effect.

6. The utility model provides a totally enclosed permanent magnet brushless motor, the installation cavity is provided with a motor rotor, a motor stator and an insulating heat conducting liquid, wherein, when the motor runs, the heat generated by the rotor is conducted to the shell and/or the upper cover through the heat conducting liquid, thus improving the heat conducting speed and efficiency, not only improving the safety of the motor applied to a small electric tool, but also utilizing the motor shell which is applied with wider metal material to carry out the timely cooling and heat dissipation of the whole motor, compared with the prior art in which the heat is conducted through air and the motor body, the heat conducting liquid is filled in the installation cavity of the motor shell, the way of directly contacting with the rotor to conduct heat and dissipating heat through the motor shell is simpler and more efficient, and the heat of some high-temperature positions and high-temperature parts which are difficult to dissipate heat and cool locally in the motor can be timely conducted out, and the heat dissipation of the whole motor is more efficient and sufficient, the heat of the rotor position is timely dissipated, the temperature of the rotor under the high-speed rotating working condition is greatly reduced, the rotor loss aging caused by the high-temperature high-rotating speed of the rotor is reduced, the overall safety and the heat dissipation efficiency are high, the service life of the motor is longer, and the maintenance work in the use process of the motor is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a first perspective view of a fully-sealed permanent magnet brushless motor according to the present invention;

fig. 2 is a second perspective view of the hermetically sealed permanent magnet brushless motor;

fig. 3 is a cross-sectional view of a fully-enclosed permanent magnet brushless motor;

FIG. 4 is a cross-sectional view of the power tool;

FIG. 5 is an enlarged view of a portion of FIG. 4;

FIG. 6 is a cross-sectional view of a prior art permanent magnet brushless motor;

FIG. 7 is a schematic diagram of a prior art power tool;

fig. 8 is a partially enlarged schematic view of fig. 7.

Description of reference numerals: 01. a housing; 02. an upper cover; 03. a flange; 04. a seal ring; 05. an annular groove; 06. a housing; 07. a gap;

1. a housing; 11. a mounting cavity; 12. a first rib; 13. a first lug; 2. an upper cover; 21. mounting a plate; 22. an annular groove; 23. a second rib; 24. a second lug; 3. a seal ring; 4. and (4) a housing.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Examples

The present embodiment provides an electric tool, as shown in fig. 4 and 5, including a housing, a fully-sealed permanent magnet brushless motor mounted at the front end of the housing 4, and a fan mounted at the rear end of the housing 4.

Full-sealed permanent magnet brushless motor. As shown in fig. 1-3, comprises a housing 1, an upper cover 2 and a sealing ring 3.

The motor comprises a shell 1 and a heat conducting liquid, wherein the shell 1 is provided with a mounting cavity 11 for mounting a motor rotor, a motor stator and the heat conducting liquid, and heat generated by the rotor is conducted to the shell 1 and/or the upper cover 2 through the heat conducting liquid when the motor runs. The outer wall of the shell 1 is provided with a plurality of first convex ribs 12 and first convex lugs 13 at intervals, and the contact area between the shell 1 and the outside is increased by the first convex ribs 12, so that the radiating effect is improved.

In the above embodiment, the heat conducting liquid may further adopt insulating materials such as liquid paraffin and silicone oil, and the multiple insulating materials play a role in conducting heat and reduce the possibility of electrification of the outer surface of the whole motor, so that the possibility of electric shock after a user touches the motor housing 1 is greatly reduced when the motor is damaged or electric leakage occurs due to other accidental situations, and the use safety of the motor is further improved.

The upper cover 2 is fastened to the top of the housing 1, as shown in fig. 3, the upper cover 2 is formed with a mounting plate 21 extending into the mounting cavity 11 and disposed on an inner wall thereof, in this embodiment, an outer side surface of the mounting plate 21 abuts against an inner wall of the mounting cavity 11, so that sealing performance is improved. The middle part of mounting panel 21 lateral surface is equipped with and is suitable for the installation the annular groove 22 of sealing washer 3, during the assembly, cup joint sealing washer 3 earlier in the annular groove 22 of mounting panel 21, be connected

upper cover

2 and 1 lock of casing again, annular groove 22 is favorable to sealing washer 3 and mounting panel 21 to realize quick installation, and the assembly is more firm. Be equipped with many on the outer wall of upper cover 2 with the second protruding muscle 23 that first protruding muscle 12 corresponds the setting, and with the second lug 24 that first lug 13 corresponds the setting, the bolt passes second lug 24 and first lug 13 for with upper cover 2 and casing 1 fixed connection, second protruding muscle 23 has increased upper cover 2 and external area of contact, thereby is favorable to improving the radiating effect. The upper cover 2 and the shell 1 are spliced to form a straight cylinder shape, namely the external dimension of the upper cover 2 is the same as that of the main body of the shell 1, and compared with the direction that a flange which protrudes outwards is arranged at the top of the shell 1 to install a sealing ring in the prior art, on one hand, the overall external dimension of the motor can be smaller, so that the miniaturization of a product is facilitated, and the cost is reduced; in addition, the wind blown out by the fan can not be blocked, and the wind speed is high, so that the quick heat dissipation of the motor is facilitated.

And the sealing ring 3 is arranged between the outer side surface of the mounting plate 21 and the inner wall of the mounting cavity 11 and is suitable for sealing a gap between the outer side surface and the inner wall.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A totally enclosed permanent magnet brushless motor, comprising:

a housing (1) having a mounting cavity (11);

the upper cover (2) is buckled at the top of the shell (1), and a mounting plate (21) which extends into the mounting cavity (11) and is arranged adjacent to the inner wall of the mounting cavity is formed in the upper cover (2);

and the sealing ring (3) is arranged between the outer side surface of the mounting plate (21) and the inner wall of the mounting cavity (11) and is suitable for sealing a gap between the outer side surface and the inner wall.

2. A totally enclosed permanent magnet brushless motor according to claim 1, characterized in that the mounting plate (21) is provided with an annular groove (22) in the middle of its outer side adapted to mount the sealing ring (3).

3. The hermetically sealed permanent magnet brushless electric machine according to claim 2, characterized in that the outer side of the mounting plate (21) abuts against the inner wall of the mounting cavity (11).

4. A totally enclosed permanent magnet brushless motor according to any of claims 1-3, characterized in that the upper cover (2) is spliced with the housing (1) to form a straight cylinder.

5. A totally enclosed permanent magnet brushless motor according to claim 4, characterized in that the outer wall of the housing (1) is provided with a plurality of first ribs (12) at intervals.

6. The totally enclosed permanent magnet brushless motor of claim 5, characterized in that the outer wall of the upper cover (2) is provided with a plurality of second ribs (23) corresponding to the first ribs (12).

7. The totally enclosed permanent magnet brushless motor according to claim 6, characterized in that the outer wall of the housing (1) is provided with a plurality of first lugs (13) at intervals, and the outer wall of the upper cover (2) is provided with a plurality of second lugs (24) at intervals, which are arranged corresponding to the first lugs (13).

8. A totally enclosed permanent magnet brushless motor according to any of claims 1, 2, 3, 5, 6, 7, characterized in that the mounting cavity (11) is provided with a motor rotor, a motor stator and an insulating heat conducting liquid, wherein during motor operation, heat generated by the rotor is conducted to the housing (1) and/or the upper cover (2) by the heat conducting liquid.

9. An electric tool comprising a housing (4), a hermetically sealed permanent magnet brushless motor according to any of claims 1 to 8 mounted at a front end of the housing (4), and a fan mounted at a rear end of the housing (4).