Novel brush direct current motor

Abstract

The utility model discloses a novel brush direct current motor, which comprises a shell, a rotating shaft, a stator, a rotor, a commutator, a carbon brush assembly and fan blades, a cavity is arranged in the shell, the shell comprises an upper shell and a lower shell, the lower shell is fixed at the bottom end of the upper shell, the stator is fixed on the inner wall of the upper shell, the rotor is fixed on the rotating shaft, and two ends of the rotating shaft respectively penetrate through the upper shell and the lower shell and then extend out. The commutator is fixed on the rotating shaft, mounting boxes are arranged on two sides of the lower shell, the carbon brush assemblies are arranged in the mounting boxes and correspond to the commutator, and the fan blades sleeve one end, close to the lower shell, of the rotating shaft. The upper shell and the lower shell are arranged, so that the whole shell is separately molded and processed, and the processing difficulty of the whole shell is reduced; and meanwhile, the carbon brush assembly is arranged on the lower shell, so that the carbon brush assembly can be conveniently mounted in the mounting box, the assembling process of the whole motor is simplified, and the mounting difficulty of the motor is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor field, especially a kind of novel brush DC motor. BACKGROUND

[0002] Brush DC motor is now widely used in many household appliances, relatively simple structure, such as the application number 201720707286.6 discloses a kind of permanent magnet brush DC motor, wherein the shell body is an entirety, the shell body volume is larger, increase the processing difficulty of shell body;At the same time, the carbon powder scraped off by graphite brush head during use is easy to accumulate in the shell body, and carbon powder conduction breakdown phenomenon is easy to appear, which affects the service life of the whole motor. CONTENT OF UTILITY MODEL

[0003] The utility model aims at providing a kind of novel brush DC motor to solve at least one of the above problems.

[0004] According to an aspect of the utility model, a kind of novel brush DC motor is provided, including shell, pivot, stator, rotor, commutator, carbon brush assembly and fan blade, cavity is equipped in shell, shell includes upper shell and lower shell, lower shell is fixed at the bottom end of upper shell, stator is fixed on the inner wall of upper shell, rotor is fixed on pivot, the both ends of pivot are respectively after being penetrated through upper shell and lower shell and are stretched out, commutator is fixed on pivot, the both sides of lower shell are equipped with installation box, carbon brush assembly is located in installation box, and correspond with commutator, fan blade is set in the end of pivot close to lower shell.

[0005] The utility model has the advantages that: by being equipped with upper shell and lower shell, the whole shell is shaped and processed separately, so that the processing difficulty of the whole shell is reduced;At the same time, carbon brush assembly is arranged on lower shell, so that carbon brush assembly can be conveniently installed in installation box, the assembly process of the whole motor is simplified, and the installation difficulty of motor is reduced.

[0006] In some embodiments, a kind of novel brush DC motor further includes end cover, end cover is fixed at the top end of upper shell, and pivot is stretched out after being penetrated through end cover. Therefore, by being equipped with end cover, the integrity of the whole shell can be improved, and each structure in shell can be protected.

[0007] In some embodiments, first vent hole is arranged on end cover, second vent hole is arranged on the bottom of lower shell, first vent hole and second vent hole are communicated, and fan blade is located below the bottom of lower shell. Therefore, by first vent hole and second vent hole, air can be conveniently convection, which is beneficial to cooling each component in shell.

[0008] In some embodiments, the mounting box is integrally formed with the lower shell, and the bottom end of the mounting box is higher than the upper end surface of the bottom of the lower shell. Thus, after the carbon brush assembly is installed in the mounting box, in use, the scraped carbon powder can fall downward without accumulating at the mounting box, so that the carbon powder and the carbon brush assembly have a certain distance, thereby facilitating the increase of the creepage distance and protecting the entire motor.

[0009] In some embodiments, the bottom of the lower shell is provided with a through hole located directly below the mounting box, and the inner side end surface of the mounting box is located between the side walls on the opposite sides of the through hole. Thus, by providing the through hole, the carbon powder can directly fall out through the through hole when falling, thereby greatly reducing the accumulation of the carbon powder.

[0010] In some embodiments, the new brush DC motor further comprises a first bearing sleeved on the rotating shaft and located at the joint of the rotating shaft and the end cover. Thus, by providing the first bearing, the rotation of the rotating shaft is facilitated, direct contact between the rotating shaft and the end cover is avoided, the wear of the end cover and the rotating shaft is reduced, and the overall service life is improved.

[0011] In some embodiments, the new brush DC motor further comprises a second bearing sleeved on the rotating shaft and located at the joint of the rotating shaft and the bottom of the lower shell. Thus, by providing the second bearing, the wear of the bottom of the lower shell and the rotating shaft is reduced, and the overall service life is improved.

[0012] In some embodiments, one end of the mounting box extends into the cavity, the other end is located outside the lower shell, and the opposite sides of the mounting box are provided with mounting holes. Thus, by providing the mounting holes, the limiting and fixing of the carbon brush assembly are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is a structural schematic diagram of a new brush DC motor of the utility model;

[0014] Fig. 2 is a sectional view structural schematic diagram of a new brush DC motor of the utility model;

[0015] Fig. 3 is an exploded structural schematic diagram of a new brush DC motor of the utility model;

[0016] Fig. 4 is a structural schematic diagram of a lower shell in a new brush DC motor of the utility model. DETAILED DESCRIPTION

[0017] The utility model will be further described in detail below with reference to the drawings.

[0018] REFERENCE Figs. 1-4The utility model relates to a novel brush DC motor, including shell 1, pivot 2, stator 3, rotor 4, commutator 5, carbon brush assembly and fan blade 6, be equipped with cavity 11 in shell 1, shell 1 includes upper shell 12 and lower shell 13, lower shell 13 is fixed at the bottom end of upper shell 12, stator 3 is fixed on the inner wall of upper shell 12, rotor 4 is fixed on pivot 2, and the both ends of pivot 2 respectively after the penetration upper shell 12 and lower shell 13 stretch out, commutator 5 is fixed on pivot 2, and the both sides of lower shell 13 are equipped with installation box 131, and carbon brush assembly is located in installation box 131 and corresponds with commutator 5, and fan blade 6 is set in pivot 2 and is close to the one end of lower shell 13, wherein, carbon brush assembly is not shown in the drawing, and carbon brush assembly is prior art, and specifically includes carbon brush, spring and baffle, wherein, the one end of spring is in contact with carbon brush, and the other end is fixed on baffle, and the both ends of baffle are fixed on installation box, and through the spring action on carbon brush, make carbon brush keep contact with commutator, satisfy the use requirement of motor, stator 3 includes magnetic steel, and magnetic steel is pasted and fixed on the inner wall of upper shell 12, and stator 3, rotor 4 and commutator 5 are all prior art structure, and specific structure will not be repeated,

[0019] When actually using, upper shell 12 is metal piece, and lower shell 13 is injection molding piece, which is beneficial to the injection molding of lower shell 13, and when the corresponding structures in upper shell 12 and lower shell 13 are installed, upper shell 12 and lower shell 13 can be fixed by adhesive.

[0020] The novel brush DC motor further comprises an end cover 7, the end cover 7 is fixed at the top end of the upper shell 12, and the pivot 2 penetrates through the end cover 7 and extends out.

[0021] A first ventilation hole 71 is formed in the end cover 7, and a second ventilation hole 132 is formed in the bottom of the lower shell 13, the first ventilation hole 71 and the second ventilation hole 132 are communicated, and the fan blade 6 is located below the bottom of the lower shell 13.

[0022] The first ventilation hole 71 and the second ventilation hole 132 can be multiple, which can improve the air circulation efficiency.

[0023] The installation box 131 and the lower shell 13 are integrally injection molded, and the bottom end of the installation box 131 is higher than the upper end surface of the bottom of the lower shell 13.

[0024] The bottom of the lower shell 13 is provided with a through hole 133, which is located directly below the mounting box 131, and the inner side end face of the mounting box 131 is located between the side walls on the opposite sides of the through hole 133. Therefore, the carbon powder scraped off by the carbon brush can flow out directly through the through hole 133 to a certain extent, greatly reducing the accumulation of carbon powder in the entire shell, effectively avoiding the breakdown phenomenon of carbon powder electrification, and improving the service life of the entire motor.

[0025] The novel brush DC motor further comprises a first bearing 8, the first bearing 8 is sleeved on the rotating shaft 2, and the first bearing 8 is located at the cooperation position of the rotating shaft 2 and the end cover 7.

[0026] The novel brush DC motor further comprises a second bearing 9, the second bearing 9 is sleeved on the rotating shaft 2, and the second bearing 9 is located at the cooperation position of the rotating shaft 2 and the bottom of the lower shell 13.

[0027] By arranging the first bearing 8 and the second bearing 9, the rotation of the rotating shaft 2 is facilitated, the rotating shaft 2 is prevented from directly contacting the end cover and the bottom of the lower shell, the frictional force during rotation is reduced, and the abrasion is reduced.

[0028] One end of the mounting box 131 extends into the cavity 11, and the other end is located outside the lower shell 13, and the mounting box 131 is provided with mounting holes 134 on opposite sides. By arranging the mounting holes 13, therefore, the two ends of the baffle in the carbon brush assembly are inserted into the mounting holes 134 on the two sides, the fixation of the baffle on the mounting box 131 is realized, and the installation of the entire carbon brush assembly in the mounting box 131 is facilitated.

[0029] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled persons in the art, without departing from the creative concept of the utility model, a plurality of modifications and improvements can be made, which all belong to the protection range of the utility model.

Claims

1. A novel brushed DC motor, characterized in that, The device includes a housing (1), a shaft (2), a stator (3), a rotor (4), a commutator (5), a carbon brush assembly, and a fan blade (6). The housing (1) has a cavity (11). The housing (1) includes an upper shell (12) and a lower shell (13). The lower shell (13) is fixed to the bottom end of the upper shell (12). The stator (3) is fixed to the inner wall of the upper shell (12). The rotor (4) is fixed on the shaft (2). The two ends of the shaft (2) extend through the upper shell (12) and the lower shell (13) respectively. The commutator (5) is fixed on the shaft (2). The lower shell (13) has mounting boxes (131) on both sides. The carbon brush assembly is located in the mounting box (131) and corresponds to the commutator (5). The fan blade (6) is sleeved on the end of the shaft (2) near the lower shell (13).

2. The novel brushed DC motor according to claim 1, characterized in that, It also includes an end cap (7), which is fixed to the top of the upper shell (12), and the shaft (2) extends out after passing through the end cap (7).

3. A novel brushed DC motor according to claim 2, characterized in that, The end cap (7) is provided with a first ventilation hole (71), and the bottom of the lower shell (13) is provided with a second ventilation hole (132). The first ventilation hole (71) and the second ventilation hole (132) are connected. The fan blade (6) is located below the bottom of the lower shell (13).

4. A novel brushed DC motor according to any one of claims 1 to 3, characterized in that, The mounting box (131) and the lower shell (13) are integrally formed, and the bottom of the mounting box (131) is higher than the upper surface of the bottom of the lower shell (13).

5. A novel brushed DC motor according to claim 4, characterized in that, The bottom of the lower shell (13) is provided with a through hole (133), which is located directly below the mounting box (131). The inner end face of the mounting box (131) is located between the side walls on opposite sides of the through hole (133).

6. A novel brushed DC motor according to claim 3, characterized in that, It also includes a first bearing (8), which is sleeved on the rotating shaft (2) and located at the joint between the rotating shaft (2) and the end cover (7).

7. A novel brushed DC motor according to claim 4, characterized in that, It also includes a second bearing (9), which is sleeved on the rotating shaft (2) and located at the bottom of the rotating shaft (2) and the lower shell (13).

8. A novel brushed DC motor according to any one of claims 1 to 3, characterized in that, One end of the mounting box (131) extends into the cavity (11), and the other end is located on the outside of the lower shell (13). Mounting holes (134) are provided on opposite sides of the mounting box (131).

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