Heat dissipation structure of outer rotor motor

Abstract

The utility model provides a heat radiation structure of an external rotor motor, and belongs to the technical field of motors. The problem that a filter screen of an existing motor is inconvenient to replace is solved. The motor comprises a rear barrel body and a front cover with a center hole, the rear barrel body and the front cover are coaxially arranged, a supporting pipe is horizontally arranged in the rear barrel body, a rotating shaft horizontally penetrates through the supporting pipe, the rear end of the rotating shaft is fixedly connected with the rear barrel body, and the front end of the rotating shaft penetrates through the front cover and the front end of the rear barrel body to be inserted into the rear end of the front cover and is in clearance fit with the front cover. The heat dissipation structure comprises a circle of air inlets formed in the side wall of the front end of the front cover, a circle of air outlets are formed in the side wall of the rear end of the rear barrel body, fan blades pushing air towards the air outlets are arranged in the rear barrel body, the rotating shaft is only rotationally connected with the supporting pipe through a bearing, and the front end of the supporting pipe is detachably and fixedly connected with the front cover. A cylindrical filter screen matched with an inner cavity of the front cover in shape and size is clamped and fixed in the front cover, and the air inlet is right opposite to the cylindrical filter screen. According to the utility model, the cylindrical filter screen is convenient to replace.

Description

Technical Field

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

[0002] Existing electric motors, such as an outer rotor motor disclosed in the Chinese Patent Library (application number: 202210744514.2), include an axially extending shaft, an inner stator sleeved on the outer periphery of the shaft, an outer rotor and a fan fixed on the shaft, wherein the inner stator is located between the shaft and the outer rotor, and the fan rotates with the shaft to generate airflow; the fan has a hub driven by the shaft and a plurality of blades radially protruding outward from the outer peripheral surface of the hub, and the diameter d of the hub is equal to the diameter of the outer rotor. The ratio of the diameter D of the fan is less than or equal to 0.6; the outer rotor is provided with an annular side wall and an end wall located at one axial end of the annular side wall, the annular side wall and the end wall are arranged to form the accommodating cavity, the inner stator is accommodated in the accommodating cavity, and the fan is arranged adjacent to the end wall; the end wall is fixed on the rotating shaft and is provided with an air inlet connected to the accommodating cavity, the fan is arranged adjacent to the air inlet, and the ratio of the total air inlet area S1 of the air inlet to the circumferential area S2 of the end wall is greater than or equal to 0.7.

[0003] The above-mentioned motor supplies air into the interior of the motor through the air inlet to achieve motor heat dissipation, and in actual use, in order to prevent external particulate impurities from entering the interior of the motor along with the gas, a filter is generally fixed between the fan and the air inlet. However, in the above-mentioned motor, the rotating shaft is set on the inner stator assembly through a bearing, which requires the rotating shaft to be pulled out and the fan to be removed when cleaning the filter, and the whole operation is relatively cumbersome. Utility Model Content

[0004] The utility model aims to solve the above problems in the prior art and proposes a heat dissipation structure of an outer rotor motor which is convenient for disassembly and assembly of a cylindrical filter.

[0005] The purpose of the utility model can be achieved through the following technical solutions: an outer rotor motor heat dissipation structure, the motor includes a coaxially arranged rear barrel body and a front cover with a center hole, a support tube is horizontally arranged in the rear barrel body, a rotating shaft is horizontally passed through the support tube, the rear end of the rotating shaft is fixedly connected to the above-mentioned rear barrel body, the front end of the rotating shaft passes through the front cover, the front end of the rear barrel body is inserted into the rear end of the front cover and the two are gap-matched, the heat dissipation structure includes a circle of air inlets arranged on the front end side wall of the front cover, a circle of exhaust ports are arranged on the rear end side wall of the rear barrel body, and a fan blade that pushes the gas toward the exhaust port is arranged in the rear barrel body, characterized in that the rotating shaft utilizes a bearing and is only rotatably connected to the support tube, and the front end of the support tube is detachably connected to the front cover; a cylindrical filter screen whose shape and size match the inner cavity of the front cover is clamped and fixed in the front cover, and the air inlet is arranged opposite to the cylindrical filter screen.

[0006] When the motor is running, the rear barrel rotates at high speed to form negative pressure inside it, and the external air is sucked into the rear barrel through the air inlet, and finally thrown out through the exhaust port under the action of the fan blades. Among them, the cylindrical filter set at the air inlet is used to block large particles of impurities to prevent impurities from entering the rear barrel and affecting the normal operation of the motor.

[0007] The rotating shaft is only rotatably connected to the support tube, so that the support tube, the rotating shaft and the rear barrel body are connected as a whole, and the front end of the support tube is designed to be detachably fixedly connected to the front cover. In this way, after removing the above-mentioned whole, the cylindrical filter can be pulled out forcefully for cleaning or replacement, which is convenient for subsequent maintenance.

[0008] In the above-mentioned outer rotor motor heat dissipation structure, a ring-shaped limit seat is formed on the front end outer wall of the above-mentioned support tube, the front end surface of the limit seat is pressed on the front cover and the two are fixedly connected by a circle of screws, the axis of the screw extends along the axial direction of the rotating shaft, and the head of the screw is outside the front cover to facilitate the separation of the support tube from the front cover.

[0009] In the above-mentioned outer rotor motor heat dissipation structure, the front cover is provided with through holes for the screw rods to pass through, the number of through holes and screws is the same and the positions correspond one to one; the through holes are step holes, and the screw heads are completely accommodated in the corresponding through holes, so that the front end surface of the front cover is completely flat, which facilitates the installation and positioning of the front cover.

[0010] In the above-mentioned outer rotor motor heat dissipation structure, a guide ring coaxial with the support tube is formed on the front end surface of the support tube. The shape and size of the guide ring match the above-mentioned center hole, and the guide ring is inserted into the center hole to guide the connection between the support tube and the front cover, which is convenient for assembly.

[0011] In the above-mentioned outer rotor motor heat dissipation structure, the bearing is located in the support tube, there are at least two bearings and they extend axially along the support tube, and one end of the frontmost bearing extends to the above-mentioned guide ring, so that the front end of the rotating shaft can obtain better support and improve the working stability of the motor.

[0012] In the above-mentioned outer rotor motor heat dissipation structure, a support ring is provided on the rear side of the cylindrical filter, and the support ring is sleeved on the support tube. The cylindrical filter is pressed on the front end surface of the support ring and the two are fixedly connected. The inner diameter of the cylindrical filter is larger than the inner diameter of the support ring to increase the operating area and make the cylindrical filter easier to insert or pull out.

[0013] In the above-mentioned heat dissipation structure of the outer rotor motor, a circle of pull rods is vertically fixed on the rear end surface of the support ring to provide a more convenient holding point for inserting or pulling out the cylindrical filter.

[0014] In the above outer rotor motor heat dissipation structure, the front end surface of the cylindrical filter is pressed against the inner side of the front end surface of the front cover, which is used for limiting the installation of the cylindrical filter, so that the cylindrical filter can be installed in place at one time, which is convenient for assembly.

[0015] In the above-mentioned heat dissipation structure of the outer rotor motor, the fan blades and the rear barrel are an integrated structure.

[0016] As another solution, in the above-mentioned heat dissipation structure of the outer rotor motor, the front end of the support tube is screwed into the center hole, which can also achieve a detachable fixed connection between the support tube and the front cover.

[0017] Compared with the prior art, the heat dissipation structure of the outer rotor motor has the following advantages:

[0018] 1. The rotating shaft is only rotatably connected to the support tube, so that the support tube, the rotating shaft and the rear barrel body are connected as a whole, and the front end of the support tube is designed to be detachably connected to the front cover. In this way, after removing the above-mentioned whole, the cylindrical filter can be pulled out for cleaning or replacement, which is convenient for subsequent maintenance.

[0019] 2. With the cooperation of the support ring and the pull rod, a more convenient holding point is provided for the insertion or removal of the cylindrical filter, which is convenient for the insertion of the cylindrical filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of an external rotor motor.

[0021] Figure 2 It is a cross-sectional schematic diagram of an external rotor motor.

[0022] Figure 3 It is a schematic diagram of the connection between the front cover, the support tube and the rotating shaft.

[0023] In the figure, 1, rear barrel; 1a, exhaust port; 1b, fan blade; 2, front cover; 2a, air inlet; 3, support tube; 3a, limit seat; 3b, guide ring; 4, rotating shaft; 5, bearing; 6, cylindrical filter; 7, screw; 8, support ring; 9, pull rod. DETAILED DESCRIPTION

[0024] 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. Embodiment 1

[0025] like Figure 1 and Figure 2 As shown, the outer rotor motor comprises a coaxially arranged rear barrel 1 and a front cover 2 with a center hole. The front end of the rear barrel 1 is inserted into the rear end of the front cover 2 and the two are clearance-matched, that is, at this time, the rear barrel 1 and the front cover 2 are not in contact, and there is an annular gap between the rear barrel 1 and the front cover 2.

[0026] Specifically,

[0027] A support tube 3 is horizontally arranged in the rear barrel body 1, and a rotating shaft 4 is horizontally passed through the support tube 3, and the support tube 3, the rotating shaft 4 and the rear barrel body 1 are coaxially arranged. The rear end of the rotating shaft 4 is fixedly connected to the rear barrel body 1, and the front end of the rotating shaft 4 passes through the front cover 2. The middle part of the rotating shaft 4 is connected to the support tube 3 by a bearing 5, and the bearing 5 is in the support tube 3.

[0028] like Figure 1 and Figure 2 As shown, the heat dissipation structure of the outer rotor motor includes a circle of air inlets 2a arranged on the front end side wall of the front cover 2, and the circle of air inlets 2a is evenly distributed along the circumference of the front cover 2. A circle of exhaust ports 1a is arranged on the rear end side wall of the rear barrel 1, and the circle of exhaust ports 1a is evenly distributed along the circumference of the rear barrel 1. The rear barrel 1 is provided with a fan blade 1b that pushes the gas toward the exhaust port 1a, and the fan blade 1b rotates synchronously with the rear barrel 1.

[0029] The front end of the support tube 3 is detachably fixedly connected to the front cover 2 ; a cylindrical filter screen 6 whose shape and size match the inner cavity of the front cover 2 is clamped and fixed inside the front cover 2 , and the air inlet 2a is arranged opposite to the cylindrical filter screen 6 .

[0030] When the motor is running, the rear barrel 1 rotates at a high speed to form a negative pressure inside it, and the external air is sucked into the rear barrel 1 through the air inlet 2a, and finally thrown out through the exhaust port 1a under the action of the fan blade 1b. Among them, the cylindrical filter 6 arranged at the air inlet 2a is used to block large particles of impurities to prevent impurities from entering the rear barrel 1 and affecting the normal operation of the motor.

[0031] The rotating shaft 4 is only rotatably connected to the support tube 3, so that the support tube 3, the rotating shaft 4 and the rear barrel body 1 are connected as a whole, and the front end of the support tube 3 is designed to be detachably fixedly connected to the front cover 2. In this way, after removing the above-mentioned whole, the cylindrical filter screen 6 can be pulled out with force for cleaning or replacement, which is convenient for subsequent maintenance.

[0032] In this embodiment,

[0033] like Figure 2 and Figure 3 As shown, the support tube 3 and the front cover 2 are connected in the following manner: an annular stopper 3a is formed on the front outer wall of the support tube 3, and the stopper 3a and the support tube 3 are coaxially arranged. The front end surface of the stopper 3a is pressed on the front cover 2, and the two are fixedly connected by a circle of screws 7. The circle of screws 7 is evenly distributed along the circumference of the front cover 2, the axis of the screws 7 extends axially along the rotating shaft 4, and the head of the screw 7 is outside the front cover 2, so as to facilitate the separation of the support tube 3 from the front cover 2.

[0034] Further explanation: the front cover 2 is provided with through holes for the rods of the screws 7 to pass through, and the number of through holes and screws 7 is the same and the positions correspond one to one; the through holes are stepped holes, and the heads of the screws 7 are completely accommodated in the corresponding through holes, so that the front end surface of the front cover 2 is completely flat, which is convenient for the installation and positioning of the front cover 2. A guide ring 3b coaxial with the support tube 3 is integrally formed on the front end surface of the support tube 3, and the shape and size of the guide ring 3b match the above-mentioned center hole, and the guide ring 3b is inserted in the center hole, which is used for guiding the connection between the support tube 3 and the front cover 2, and is convenient for assembly.

[0035] like Figure 2 As shown, the bearing 5 is in the support tube 3, there are at least two bearings 5 ​​and they extend axially along the support tube 3, and one end of the bearing 5 at the front extends to the guide ring 3b, so that the front end of the rotating shaft 4 is better supported and the working stability of the motor is improved. In the actual product, the number of bearings 5 ​​is 2, and the type of bearing 5 is ball bearing 5.

[0036] like Figure 2 As shown, a support ring 8 is provided on the rear side of the cylindrical filter 6, and the support ring 8 is sleeved on the support tube 3, the cylindrical filter 6 is pressed on the front end face of the support ring 8 and the two are fixedly connected, and the inner diameter of the cylindrical filter 6 is larger than the inner diameter of the support ring 8 to increase the operation area, so that the cylindrical filter 6 can be inserted or pulled out more easily. Further explanation, a circle of pull rods 9 is vertically fixed on the rear end face of the support ring 8 to provide a more convenient gripping point for the insertion or removal of the cylindrical filter 6. Preferably, the pull rod 9 is welded and fixedly connected to the support ring 8; the cylindrical filter 6 and the support ring 8 are welded and fixedly connected; the front end face of the cylindrical filter 6 is pressed on the inner side of the front end face of the front cover 2, which is used for the installation limit of the cylindrical filter 6, so that the cylindrical filter 6 can be installed in place at one time, which is convenient for assembly.

[0037] In the actual product, the fan blade 1b and the rear barrel body 1 are an integrated structure. Embodiment 2

[0038] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that the front end of the support tube 3 is screwed into the center hole, so that the support tube 3 and the front cover 2 can also be detachably connected.

[0039] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An external rotor motor heat dissipation structure, the motor comprises a coaxially arranged rear barrel (1) and a front cover (2) with a center hole, a support tube (3) is horizontally arranged in the rear barrel (1), a rotating shaft (4) is horizontally passed through the support tube (3), a rear end of the rotating shaft (4) is fixedly connected to the above-mentioned rear barrel (1), a front end of the rotating shaft (4) passes through the front cover (2), the front end of the rear barrel (1) is inserted into the rear end of the front cover (2) and the two are clearance-matched, the heat dissipation structure comprises a circle of air inlets (2a) arranged on the front end side wall of the front cover (2), a circle of exhaust ports (1a) is arranged on the rear end side wall of the rear barrel (1), and a fan blade (1b) is arranged in the rear barrel (1) to push the gas toward the exhaust port (1a), characterized in that: The rotating shaft (4) utilizes a bearing (5) and is only rotatably connected to the support tube (3), and the front end of the support tube (3) is detachably fixedly connected to the front cover (2); a cylindrical filter screen (6) having a shape and size matching the inner cavity of the front cover (2) is clamped and fixed in the front cover (2), and the air inlet (2a) is arranged opposite to the cylindrical filter screen (6).

2. The heat dissipation structure of the outer rotor motor according to claim 1, characterized in that: An annular limit seat (3a) is formed on the front outer wall of the support tube (3). The front end surface of the limit seat (3a) is pressed on the front cover (2) and the two are fixedly connected by a circle of screws (7). The axis of the screw (7) extends axially along the rotating shaft (4), and the head of the screw (7) is located outside the front cover (2).

3. The heat dissipation structure of the outer rotor motor according to claim 2, characterized in that: The front cover (2) is provided with through holes for the rods of the screws (7) to pass through, and the through holes and the screws (7) are the same in number and have corresponding positions; the through holes are step holes, and the heads of the screws (7) are completely accommodated in the corresponding through holes.

4. The heat dissipation structure of the outer rotor motor according to claim 3, characterized in that: A guide ring (3b) coaxial with the support tube (3) is formed on the front end surface of the support tube (3); the shape and size of the guide ring (3b) match the central hole, and the guide ring (3b) is inserted into the central hole.

5. The heat dissipation structure of the outer rotor motor according to claim 4, characterized in that: The bearing (5) is located in the support tube (3), and there are at least two bearings (5) extending axially along the support tube (3), and one end of the bearing (5) located at the frontmost extends to the guide ring (3b).

6. The heat dissipation structure of the outer rotor motor according to claim 1, characterized in that: A support ring (8) is provided on the rear side of the cylindrical filter (6), and the support ring (8) is sleeved on the support tube (3). The cylindrical filter (6) is pressed on the front end surface of the support ring (8) and the two are fixedly connected. The inner diameter of the cylindrical filter (6) is larger than the inner diameter of the support ring (8).

7. The heat dissipation structure of the outer rotor motor according to claim 6, characterized in that: A pull rod (9) is vertically fixed on the rear end surface of the support ring (8).

8. The heat dissipation structure of an outer rotor motor according to claim 1, characterized in that: The front end surface of the cylindrical filter (6) is pressed against the inner side of the front end surface of the front cover (2).

9. The heat dissipation structure of an outer rotor motor according to claim 1, characterized in that: The fan blade (1b) and the rear barrel (1) are an integrated structure.

10. The heat dissipation structure of an outer rotor motor according to claim 1, characterized in that: The front end of the support tube (3) is screwed into the center hole.

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