Heat dissipation structure of brush direct current motor

Abstract

The utility model provides a heat dissipation structure of a brush direct current motor, and belongs to the technical field of motors. The problem that an existing motor is poor in heat dissipation performance is solved. According to the utility model, a motor comprises a cylinder, a rotor shaft and a rotor core, the rotor core is provided with a winding, the side wall of the front end of the cylinder is provided with an air inlet, the heat dissipation structure comprises an axial fan, the axial fan comprises an annular base body fixed at the front end of the rotor shaft, and a circle of straight-strip-shaped blades are formed on the outer wall of the front end of the annular base body. The rear end of the annular base body is sleeved with a circular ring body. The rear end of each blade extends to the front end face of the circular ring body. The blades extend from the rear end faces of the blades into the circular ring body to form air guide pieces, the air guide pieces are in a right trapezoid shape, and the two bottom faces of each air guide piece are arranged on the inner side face of the circular ring body and the outer side face of the annular base body respectively. The circular ring body, the annular base body and the air guide pieces are of an integrated structure. The front end of the winding extends into the circular ring body; the air guide sheet is positioned on the front side of the winding; the heat dissipation structure of the brush direct current motor is good in heat dissipation.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors and relates to a brushed DC motor, in particular to a heat dissipation structure of a brushed DC motor. Background Art

[0002] A brushed DC motor is a rotating motor that contains a brush device and converts DC electrical energy into mechanical energy or converts mechanical energy into DC electrical energy.

[0003] An existing DC motor, such as a DC motor with good heat dissipation effect disclosed in the Chinese Patent Library (application number: 201811229006.0), includes a shell, a front end cover is provided on the left side of the shell, a rear end cover is provided on the right side of the shell, a motor assembly is provided inside the shell, a rotating shaft is fixedly installed in the middle of the motor assembly, a fixed shaft is fixedly installed on the left side of the rear end cover, the right end of the rotating shaft passes through the fixed shaft and the rear end cover in sequence and extends to the outside of the rear end cover, a cooling fan is fixedly installed on the surface of the rotating shaft at one end inside the shell, heat absorbing pads are fixedly installed on the top and bottom of the inner cavity of the shell, a heat conducting plate is fixedly installed on the left side of the inner cavity of the shell, a mounting groove is provided on the right side of the heat conducting plate, and a heat dissipation plate is fixedly installed inside the mounting groove, and a first heat dissipation hole is provided on the top and bottom of the front side of the shell.

[0004] In the above-mentioned motor, the cooling fan is an axial flow fan and is arranged on the front side. When the cooling fan is running, wind enters from the first cooling hole and contacts the motor stator. Under the shielding of the motor assembly, the winding on the stator will have less contact with the wind generated by the axial flow fan, affecting the heat dissipation of the winding. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the existing technology and to propose a brushed DC motor heat dissipation structure that can accelerate the heat dissipation of the coil.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a brushed DC motor heat dissipation structure, the motor includes a barrel and a rotor shaft and a rotor core both arranged in the barrel, a winding is provided on the rotor core, and a plurality of air inlet holes are provided on the front end side wall of the barrel. The heat dissipation structure includes an axial flow fan, which includes an annular base that is sleeved and fixed on the front end of the rotor shaft, and a circle of straight strip blades is formed on the front end outer wall of the annular base, characterized in that a circular body is coaxially sleeved on the rear end of the annular base, and the rear end of each blade extends to the front end face of the circular body; the blade extends from its rear end face position into the circular body to form an air guide plate, the air guide plate is a right-angled trapezoidal structure, and the two bottom surfaces of the air guide plate are respectively arranged on the inner side surface of the circular body and the outer side surface of the annular base; the circular body, the annular base and the air guide plate are an integrated structure; the front end of the above-mentioned winding extends into the circular body, and the air guide plate is at the front side of the winding.

[0007] The rear end of each blade extends into the annulus to form an air guide to guide part of the wind into the annulus and gather it. This can greatly increase the contact area between the wind and the winding, effectively accelerate the heat dissipation of the winding, and improve the life and working stability of the motor.

[0008] In the above-mentioned brushed DC motor heat dissipation structure, the above-mentioned axial flow fan is an injection-molded integral part, which is convenient for design and processing.

[0009] In the above-mentioned brushed DC motor heat dissipation structure, the axial cross-section of the outer peripheral surface of the annular body is an inwardly concave arc shape, which can increase the strength of the annular body and reduce the windshield area of ​​the annular body.

[0010] In the above-mentioned brushed DC motor heat dissipation structure, the air inlet is in the shape of an arc coaxial with the barrel to increase the air intake volume.

[0011] In the brushed DC motor heat dissipation structure described above, the barrel is made of metal, and the inner wall of the barrel is formed with ridges extending along the barrel axis. The ridges can both strengthen the barrel sidewall and accelerate heat dissipation.

[0012] In the above-mentioned heat dissipation structure of the brushed DC motor, there are multiple ridges distributed along the circumference of the barrel.

[0013] Compared with the existing technology, the heat dissipation structure of the brushed DC motor is set up so that the rear end of each blade extends into the annular body to form an air guide to guide part of the wind into the annular body and gather it. This can greatly increase the contact area between the wind and the winding, effectively accelerate the heat dissipation of the winding, and improve the life and working stability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of the heat dissipation structure of the brushed DC motor.

[0015] Figure 2 It is a cross-sectional schematic diagram of the heat dissipation structure of the brushed DC motor.

[0016] Figure 3 It is a three-dimensional schematic diagram of an axial flow fan.

[0017] In the figure, 1, barrel; 1a, air inlet; 1b, rib; 2, rotor shaft; 3, rotor core; 4, winding; 5, axial flow fan; 5a, annular base; 5b, blades; 5c, torus; 5d, air guide vane. DETAILED DESCRIPTION

[0018] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0019] like Figure 1 and Figure 2 As shown, the motor includes a barrel 1, a rotor shaft 2, and a rotor core 3, both of which are disposed within the barrel 1. The rotor core 3 is provided with a winding 4. The barrel 1 is provided with a plurality of air inlet holes 1a on the front sidewall. In actual products, the air inlet holes 1a are in the shape of an arc coaxial with the barrel 1 to increase the air intake.

[0020] Specifically,

[0021] like Figures 1 to 3 As shown, the brushed DC motor heat dissipation structure includes an axial fan 5, which includes an annular base 5a sleeved and fixed on the front end of the rotor shaft 2. A circle of straight blades 5b are formed on the front outer wall of the annular base 5a, and the length of the blades 5b extends along the radial direction of the annular base 5a. Figure 1 As shown, the rear end of the annular base 5a is coaxially sheathed with a circular ring 5c, and the rear end of each blade 5b extends to the front end of the circular ring 5c. Each blade 5b extends from the rear end into the circular ring 5c ​​to form an air guide 5d. The air guide 5d has a right-angled trapezoidal structure, with its two bottom surfaces located on the inner side of the circular ring 5c ​​and the outer side of the annular base 5a, respectively. The front end of the winding 4 extends into the circular ring 5c, with the air guide 5d located at the front side of the winding 4.

[0022] The rear end of each blade 5b extends into the annular body 5c to form an air guide 5d to guide part of the wind into the annular body 5c and gather it. This can greatly increase the contact area between the wind and the winding 4, effectively accelerate the heat dissipation of the winding 4, and improve the life and working stability of the motor.

[0023] In actual products, the annular body 5c, the annular base 5a and the air guide plate 5d are an integrated structure, and the axial flow fan 5 is preferably an injection-molded integral part, which is convenient for design and processing.

[0024] To further illustrate, the axial cross-section of the outer peripheral surface of the annular body 5c is an inwardly concave arc shape, which can increase the strength of the annular body 5c and reduce the wind-blocking area of ​​the annular body 5c.

[0025] like Figure 2 As shown, the barrel 1 is made of metal and has ridges 1b formed on its inner wall. The ridges 1b extend axially along the barrel 1. The ridges 1b not only strengthen the sidewall of the barrel 1 but also accelerate heat dissipation from the barrel 1. Preferably, there are multiple ridges 1b distributed circumferentially along the barrel 1.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A brushed DC motor heat dissipation structure, the motor comprising a barrel (1) and a rotor shaft (2) and a rotor core (3) both disposed in the barrel (1), a winding (4) being disposed on the rotor core (3), a plurality of air inlet holes (1a) being disposed on a front side wall of the barrel (1), the heat dissipation structure comprising an axial flow fan (5), the axial flow fan (5) comprising an annular base (5a) sleeved and fixed on the front end of the rotor shaft (2), a circle of straight strip blades (5b) being formed on the front outer wall of the annular base (5a), and the heat dissipation structure comprising: The rear end of the annular base (5a) is coaxially sleeved with a circular body (5c), and the rear end of each blade (5b) extends to the front end surface of the circular body (5c); the blade (5b) extends from its rear end surface into the circular body (5c) to form an air guide plate (5d); the air guide plate (5d) is a right-angled trapezoidal structure, and the two bottom surfaces of the air guide plate (5d) are respectively arranged on the inner side surface of the circular body (5c) and the outer side surface of the annular base (5a); the annular body (5c), the annular base (5a) and the air guide plate (5d) are an integrated structure; the front end of the winding (4) extends into the circular body (5c), and the air guide plate (5d) is located at the front side of the winding (4).

2. The brushed DC motor heat dissipation structure according to claim 1, characterized in that: The axial flow fan (5) is an injection-molded integral part.

3. The brushed DC motor heat dissipation structure according to claim 1 or 2, characterized in that: The axial cross-section of the outer peripheral surface of the annular body (5c) is an inwardly concave arc shape.

4. The brushed DC motor heat dissipation structure according to claim 1, characterized in that: The air inlet (1a) is in the shape of an arc coaxial with the barrel (1).

5. The brushed DC motor heat dissipation structure according to claim 1, characterized in that: The barrel (1) is made of a metal material. A convex strip (1b) is formed on the inner wall of the barrel (1). The length of the convex strip (1b) extends along the axial direction of the barrel (1).

6. The brushed DC motor heat dissipation structure according to claim 5, characterized in that: There are multiple convex strips (1b) distributed along the circumference of the barrel (1).

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