Double-layer fan blade heat dissipation direct current motor

Abstract

The utility model provides a double-layer fan blade heat dissipation direct current motor, and belongs to the technical field of motors. The motor fan solves the problems that an existing motor fan is small in air supply amount and low in heat dissipation efficiency, and large working noise can be generated. The double-layer fan blade heat dissipation direct current motor comprises a motor fan, a motor body and a heat dissipation cover, the motor fan comprises fan blades, a shaft sleeve and a connecting ring, and the fan blades comprise inner-layer fan blades and outer-layer fan blades; a penetrating shaft hole is formed in the center of the shaft sleeve, a plurality of inner-layer fan blades are evenly arranged on the outer side wall in the circumferential direction, connecting rings are fixedly connected to the positions, at the upper ends and the lower ends of the fan blades, of the annular outward sides of the inner-layer fan blades respectively, and a plurality of outer-layer fan blades are evenly arranged between the upper connecting ring and the lower connecting ring in the circumferential direction in the interval position of the adjacent inner-layer fan blades. The fan has the advantages of being large in air supply amount, dense in wind cutting, even in air supply, high in heat dissipation efficiency and low in working noise.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a double-layer fan blade heat dissipation DC motor. Background Art

[0002] A DC motor is a motor that converts DC electrical energy into mechanical energy. Due to its good performance, it is widely used in various mechanical equipment and industrial production processes. However, due to the low energy efficiency and energy loss during the operation of the motor, the motor is prone to generate a large amount of heat, which may cause the circuit to burn out, resulting in motor failure, and even causing the motor to catch fire and burn.

[0003] Under the existing technology, the DC motor mainly dissipates heat through a motor fan fixed at the end of the shaft. As Figure 1 shown, the motor fan 100 mainly includes a fan blade 110, a shaft sleeve 120, and a base 130. The fan blade 110 is a single-blade structure and is evenly distributed on the chassis 130 at equal intervals. During rotation, the air is radially ejected, and the air passes through the heat sink to dissipate heat from the motor housing. The problems of this structure are: the air supply volume is small, the heat exchange efficiency between the heat and the surrounding cold air is low, and the fan blade 110 will disturb the air to form vortices during rotation, generating relatively large working noise. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a double-layer fan blade heat dissipation DC motor that improves the heat dissipation efficiency and reduces the working noise of the motor in view of the above problems existing in the prior art.

[0005] The purpose of the utility model can be achieved by the following technical solutions: A double-layer fan blade heat dissipation DC motor includes a motor fan, a motor body, and a heat dissipation cover. The motor body is fixedly connected with a heat dissipation cover at one end and a motor shaft extends out from the center inside. The motor fan is sleeved on the motor shaft and installed inside the heat dissipation cover.

[0006] The motor fan includes a fan blade, a shaft sleeve, and a connecting ring. The center of the shaft sleeve is a through shaft hole, and a plurality of inner fan blades are circumferentially and evenly arranged on the outer side wall. At the upper and lower ends of the fan blade on the circumferentially outer side of the inner fan blade, a connecting ring is fixedly connected to each, and the connecting rings are coaxially arranged with the shaft sleeve to fixedly connect all the inner fan blades. Between the upper and lower connecting rings, a plurality of outer fan blades are circumferentially and evenly arranged at the intervals between adjacent inner fan blades.

[0007] In the above double-layer fan blade heat dissipation DC motor, a positioning groove is axially formed on the motor shaft, and a protruding positioning key is formed on the inner side wall of the shaft sleeve in the shaft hole. The positioning groove and the positioning key cooperate with each other to fix and limit the motor fan on the motor shaft.

[0008] In the above-mentioned double-layer fan blade heat dissipation DC motor, the number of blades of the inner layer fan blade and the outer layer fan blade is an odd number, and the number of blades of the outer layer fan blade is greater than that of the inner layer fan blade.

[0009] In the above-mentioned double-layer fan blade heat dissipation DC motor, the shapes of the inner layer fan blade and the outer layer fan blade are both curved surfaces that are bent forward in the counterclockwise direction, and the curved surfaces are inclined from top to bottom towards the central axis direction.

[0010] Compared with the prior art, the double-layer fan blade heat dissipation DC motor provided by the present utility model adopts a double-layer fan blade structure design, which increases the working area of the fan blades, increases the air delivery volume of the motor fan, improves the heat dissipation efficiency, and at the same time has dense wind cutting and uniform air delivery. The winds with different wind speeds of the inner and outer layers are superimposed, reducing resonance and vortices, thereby reducing the working noise of the DC motor. Description of the Drawings

[0011] Figure 1 is a schematic structural diagram of a motor fan under the prior art;

[0012] Figure 2 is a schematic structural diagram of the present double-layer fan blade heat dissipation DC motor;

[0013] Figure 3 is a schematic structural diagram of the motor fan in the present double-layer fan blade heat dissipation DC motor;

[0014] In the above figures, 100, motor fan; 110, fan blade; 111, inner layer fan blade; 112, outer layer fan blade; 120, shaft sleeve; 121, shaft hole; 122, positioning key; 130, chassis; 140, connecting ring; 200, motor body; 210, motor shaft; 211, positioning groove; 300, heat dissipation cover. Detailed Embodiments

[0015] The following are specific embodiments of the present utility model in conjunction with the drawings, and the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments.

[0016] As Figures 2 to 3 shown, the present double-layer fan blade heat dissipation DC motor includes a motor fan 100, a motor body 200, and a heat dissipation cover 300. The motor body 200 is fixedly connected with a heat dissipation cover 300 at one end, and a motor shaft 210 extends outward from the center inside. The motor fan 100 is sleeved on the motor shaft 210 and is installed inside the heat dissipation cover 300. The heat dissipation cover 300 can prevent dust in the external air from adhering to the motor fan 100 during the operation of the motor fan 100. The heat generated during the operation of the motor body 200 is dissipated through the heat dissipation fins on the motor housing.

[0017] An axially extending positioning groove 211 is formed on the motor shaft 210. The motor fan 100 includes a fan blade 110, a shaft sleeve 120, and a connecting ring 140. The center of the shaft sleeve 120 is a through shaft hole 121. An outwardly protruding positioning key 122 is formed on the inner side wall of the shaft hole 121 of the shaft sleeve 120. When installing the motor fan 100, the positioning key 122 needs to be aligned with the positioning groove 211, and the motor fan 100 is fixedly limited on the motor shaft 210 by an insertion installation from outside to inside, so that the motor fan 100 rotates together with the operation of the motor body 200 when the motor body 200 operates.

[0018] As Figure 3 shown, the fan blade 110 of the motor fan 100 includes two types, an inner fan blade 111 and an outer fan blade 112. A plurality of inner fan blades 111 are circumferentially and uniformly arranged on the outer side wall of the shaft sleeve 120. At both the upper and lower ends of the fan blade in the circumferential outward direction of the inner fan blade 111, a connecting ring 140 is fixedly connected. The connecting ring 140 is coaxially arranged with the shaft sleeve 120 to fixedly connect all the inner fan blades 111 to each other. A plurality of outer fan blades 112 are circumferentially and uniformly arranged outward between the upper and lower connecting rings 140 at the intervals of the adjacent inner fan blades 111. The upper and lower connecting rings 140 together play a role in stabilizing the overall structure of the motor fan 100. The structural design of the double-layer fan blades increases the working area of the fan blade 110, increases the air delivery volume, and improves the heat dissipation efficiency.

[0019] Furthermore, the shapes of both the inner fan blade 111 and the outer fan blade 112 are curved surfaces that are bent forward in the counterclockwise direction, and the curved surfaces are inclined from top to bottom towards the central axis direction. This structure can better cut the air during rotational operation.

[0020] Furthermore, the number of both the inner fan blade 111 and the outer fan blade 112 is an odd number, and the number of the outer fan blades 112 is greater than the number of the inner fan blades 111. If fan blades with an even number of distributions are used, it is very easy for the system to resonate, resulting in the fracture of the fan blades. When the number of the outer fan blades 112 is greater than the number of the inner fan blades 111, the range of the outer fan blades 112 is large and the number of blades is large, and the air cutting is denser, generating a higher wind speed. Similarly, the range of the inner fan blades 111 is small and the number of blades is small, generating a lower wind speed. The two kinds of winds with different wind speeds are superimposed on each other, which can effectively reduce the air vortices formed during the operation of the motor fan 100, make the air delivery more uniform, and thus reduce the working noise during the operation of the motor fan 100.

[0021] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the technical field to which the present utility model belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

[0022] Although various terms are used more frequently in this text, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present utility model; any interpretation of them as an additional limitation is contrary to the spirit of the present utility model.

Claims

1. A double-layer fan blade cooling DC motor, comprising a motor fan (100), a motor body (200) and a heat dissipation cover (300). The motor body (200) is fixedly connected with the heat dissipation cover (300) at one end and a motor shaft (210) extends out from the center inside. The motor fan (100) is sleeved on the motor shaft (210) and installed inside the heat dissipation cover (300). It is characterized in that The motor fan (100) includes fan blades (110), a shaft sleeve (120) and a connecting ring (140). The center of the shaft sleeve (120) is a through shaft hole (121), and a plurality of inner fan blades (111) are circumferentially and evenly arranged on the outer side wall. On the circumferentially outer side of the inner fan blades (111) at the upper and lower ends of each fan blade, a connecting ring (140) is fixedly connected. The connecting rings (140) are coaxially arranged with the shaft sleeve (120) to fixedly connect all the inner fan blades (111). Between the upper and lower connecting rings (140), a plurality of outer fan blades (112) are circumferentially and evenly arranged at the intervals between adjacent inner fan blades (111).

2. The double-layer fan blade heat-dissipating DC motor according to claim 1, wherein, A positioning groove (211) is axially formed on the motor shaft (210), and a protruding positioning key (122) is formed on the inner side wall of the shaft sleeve (120) in the shaft hole (121). The positioning groove (211) and the positioning key (122) cooperate with each other to fix and limit the motor fan (100) on the motor shaft (210).

3. The double-layer fan blade heat dissipation DC motor according to claim 1, characterized in that, The number of the inner fan blades (111) and the outer fan blades (112) is an odd number, and the number of the outer fan blades (112) is greater than that of the inner fan blades (111).

4. A double-layer fan blade heat dissipation DC motor according to claim 1, characterized in that, The shapes of the inner fan blades (111) and the outer fan blades (112) are both curved surfaces that are bent forward in the counterclockwise direction, and the curved surfaces are inclined from top to bottom towards the central axis direction.

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