Outer rotor motor heat dissipation structure for fan

Abstract

The utility model provides an external rotor motor heat radiation structure for a fan, and belongs to the technical field of fans. The problem that an existing motor is poor in heat dissipation is solved. The outer rotor motor heat dissipation structure for the fan comprises a cylindrical outer rotor, the rear end of the outer rotor is open, the front end of the outer rotor is sleeved and fixed with a flow guide cover with an approximately L-shaped axial section, the flow guide cover comprises a front ring and a rear ring which are vertically arranged, and the inner side face of the rear ring is attached to the outer side face of the outer rotor. A circle of air holes axially penetrate through the front end face of the outer rotor, and the front ring is attached to the front end face of the outer rotor and covers the air holes. Air guide holes are formed in the rear end surface of the front ring; the air guide holes and the air holes are the same in number and are opposite one by one; strip-shaped zigzag channels with the same number as the air guide holes are formed in the inner wall of the flow guide cover, one end of each zigzag channel extends to the rear end face of the rear ring, and the other end of each zigzag channel communicates with the corresponding air guide hole. According to the utility model, heat radiation of the motor can be enhanced.

Description

Technical Field

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

[0002] The external rotor fan is a fan with the stator in the middle of the motor and the rotor outside. Its impeller is directly driven by the external rotor motor. It has the characteristics of high efficiency, low noise, compact structure, and easy installation and maintenance.

[0003] When the fan is running, the outer rotor motor will generate a lot of heat, so a corresponding heat dissipation structure will be set up, such as a heat dissipation structure for an outer rotor fan previously proposed by the applicant (application number: 202223212715.2), which includes an outer rotor motor with a controller, and the outer wall of the controller has a plurality of axially extending heat dissipation fins. A rotor flange is fixedly connected to the shell of the outer rotor motor, and heat dissipation blades are provided on the end surface of the rotor flange facing the controller. A plurality of axially through ventilation holes are opened at the bottom of the controller, and one of the ventilation holes is provided between two adjacent heat dissipation fins.

[0004] The above heat dissipation structure mainly dissipates heat for the fan controller part, and has little heat dissipation effect on the outer rotor motor as a whole. Therefore, the outer rotor motor still has the problem of poor heat dissipation effect. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a heat dissipation structure of an outer rotor motor for a fan, and solves the technical problem of how to improve the heat dissipation effect of the outer rotor motor.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a heat dissipation structure of an outer rotor motor for a fan, comprising an outer rotor in a cylindrical shape, and the rear end of the outer rotor is open, characterized in that a guide cover with an axial cross-section that is roughly L-shaped is sleeved and fixed at the front end of the outer rotor, the guide cover comprises a vertically arranged front ring and a rear ring, the inner side of the rear ring is attached to the outer side of the outer rotor, a circle of air holes axially penetrates the front end face of the outer rotor, the front ring is attached to the front end face of the outer rotor and covers the above-mentioned air holes; air guide holes are opened on the rear end face of the front ring, the number of the air guide holes and the air holes are the same and the positions are one by one directly opposite; the inner wall of the guide cover is provided with a number of strip-shaped tortuous channels that are the same as the air guide holes, one end of the tortuous channel extends to the rear end face of the rear ring, and the other end of the tortuous channel is connected to the corresponding air guide hole.

[0007] The corresponding tortuous channels, air guide holes and air holes cooperate to form a tortuous heat dissipation channel. On the premise of forming a labyrinth seal to achieve waterproof and dustproof, the inside of the motor is directly connected to the outside through the heat dissipation channel for heat dissipation, thereby effectively accelerating the heat dissipation speed of the motor and improving the motor life and working stability.

[0008] In the above-mentioned heat dissipation structure of the outer rotor motor for the fan, the above-mentioned zigzag channel is composed of a U-shaped groove and a strip groove 1 and a strip groove 2 respectively arranged at both ends of the U-shaped groove; the U-shaped groove and the strip groove 1 are both horizontally arranged on the rear end face of the front ring, and the two ends of the strip groove 1 are respectively connected to one end of the U-shaped groove and the corresponding air guide hole; one end of the strip groove 2 is connected to the other end of the U-shaped groove, and the other end of the strip groove 2 extends to the rear end face of the rear ring. The U-shaped groove and the strip groove 1 are both arranged on the rear end face of the front ring to facilitate the formation of the zigzag channel.

[0009] In the above-mentioned fan outer rotor motor heat dissipation structure, the two ends of the U-shaped groove are distributed radially along the guide cover, so that the U-shaped groove forms a barrier in front of the second strip groove, which better prevents dust and other impurities from entering through the tortuous channel.

[0010] In the above-mentioned heat dissipation structure of the outer rotor motor for the fan, a strip-shaped conducting groove is also provided on the rear end surface of the front ring, and the above-mentioned conducting groove is provided between two adjacent air guide holes, and the two ends of the conducting groove are respectively connected to the corresponding two air guide holes. The conducting groove opens up a circle of air guide holes to speed up the heat transfer efficiency and speed up the heat dissipation of the motor.

[0011] In the above-mentioned heat dissipation structure of the outer rotor motor for the fan, both ends of the conduction groove are zigzag, and a heat dissipation hole is opened in the middle of the conduction groove along the axial direction of the air guide cover. The two ends of the zigzag conduction groove form a labyrinth seal on both sides of the heat dissipation hole. On the premise of achieving waterproof and dustproof, multiple groups of heat dissipation channels that directly connect the inside and outside of the motor are added to further accelerate the heat dissipation of the motor.

[0012] In the above-mentioned heat dissipation structure of the outer rotor motor for the fan, both ends of the conducting groove include a U-shaped zigzag section, and both ends of the zigzag section are distributed along the circumference of the air guide cover. The above-mentioned design is easy to design and process.

[0013] In the above-mentioned heat dissipation structure of the outer rotor motor for the fan, the middle part of the conduction groove is V-shaped, and the middle part of the conduction groove is composed of two straight segments, and the two ends of the two straight segments are respectively connected to the corresponding two curved segments, and the above-mentioned heat dissipation holes are arranged at the connection of the two straight segments. The middle part of the V-shaped conduction groove can form a certain barrier to further enhance the waterproof and dustproof effects.

[0014] In the above-mentioned heat dissipation structure of the outer rotor motor for the fan, the air guide cover is fixedly connected to the outer rotor by a circle of screws, which has the advantages of simple structure and stable installation.

[0015] In the above-mentioned heat dissipation structure of the outer rotor motor for the fan, the axis of the screw is parallel to the axis of the air guide cover.

[0016] In the above-mentioned heat dissipation structure of the outer rotor motor for the fan, the front ring and the outer rotor are axially penetrated by through holes and threaded holes respectively. The number of through holes, threaded holes and screws is the same and their positions correspond one to one. A screw is passed through each through hole, the screw rod is screwed into the corresponding threaded hole, and the screw head is pressed on the front end of the front ring.

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

[0018] 1. The corresponding tortuous channels, air guide holes and air vents cooperate to form a tortuous heat dissipation channel. On the premise of forming a labyrinth seal to achieve waterproof and dustproof, the inside of the motor is directly connected to the outside through the heat dissipation channel for heat dissipation, thereby effectively accelerating the heat dissipation speed of the motor and improving the motor life and working stability.

[0019] 2. The two ends of the zigzag conduction groove form a labyrinth seal on both sides of the heat dissipation hole. On the premise of achieving waterproof and dustproof, multiple groups of heat dissipation channels are added to directly connect the inside and outside of the motor to further accelerate the heat dissipation of the motor. 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 three-dimensional schematic diagram of the outer rotor.

[0022] Figure 3 It is a three-dimensional schematic diagram of the air deflector.

[0023] Figure 4 It is a cross-sectional schematic diagram of an outer rotor motor.

[0024] In the figure, 1, outer rotor; 1a, air vent; 2, air guide cover; 2a, front ring; 2b, rear ring; 2c, air guide hole; 2d, zigzag channel; 2d1, U-shaped groove; 2d2, strip groove one; 2d3, strip groove two; 2e, conduction groove; 2e1, zigzag section; 2e2, straight section; 2f, heat dissipation hole; 3, screw. DETAILED DESCRIPTION

[0025] 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.

[0026] like Figure 1 As shown, the heat dissipation structure of the outer rotor 1 motor for the fan includes a cylindrical outer rotor 1 and a guide cover 2 sleeved and fixed on the front end of the outer rotor 1. The guide cover 2 is made of a heat-conducting material, and the heat-conducting material can be stainless steel, aluminum alloy, etc.

[0027] Specifically,

[0028] like Figures 2 to 4 As shown, the rear end of the outer rotor 1 is open, and a circle of air holes 1a is axially penetrated on the front end surface. The air guide cover 2 is an integrated structure, and the axial cross section of the air guide cover 2 is roughly L-shaped. Figure 1 As shown, the air deflector 2 includes a front ring 2a and a rear ring 2b which are vertically arranged, and the front ring 2a and the rear ring 2b are transitioned by an arc. Among them, the inner side surface of the rear ring 2b and the outer side surface of the outer rotor 1 are mutually matching circumferential surfaces and are attached together; the rear end surface of the front ring 2a is attached to the front end surface of the outer rotor 1 and covers the above-mentioned air vents 1a. Air guide holes 2c are provided on the rear end surface of the front ring 2a, and the number of air guide holes 2c and the air vents 1a are the same and the positions are directly opposite. Preferably, the aperture of the air guide holes 2c is larger than the aperture of the air vents 1a. The inner wall of the air deflector 2 is provided with a strip-shaped tortuous channel 2d of the same number as the air guide holes 2c, one end of the tortuous channel 2d extends to the rear end surface of the rear ring 2b to be open, and the other end of the tortuous channel 2d is connected to the corresponding air guide hole 2c.

[0029] The tortuous channel 2d, air guide hole 2c and air vent 1a corresponding to the position cooperate to form a tortuous heat dissipation channel. On the premise of forming a labyrinth seal to achieve waterproof and dustproof, the inside of the motor is directly connected to the outside through the heat dissipation channel for heat dissipation, thereby effectively accelerating the heat dissipation speed of the motor and improving the motor life and working stability.

[0030] The structure of the zigzag channel 2d is as follows: Figure 3 As shown, the zigzag channel 2d is composed of a U-shaped groove 2d1 and a strip groove 2d2 and a strip groove 2d3 respectively arranged at both ends of the U-shaped groove 2d1. Among them, the U-shaped groove 2d1 and the strip groove 2d2 are both horizontally arranged on the rear end face of the front ring 2a, and the two ends of the strip groove 2d2 are respectively connected to one end of the U-shaped groove 2d1 and the corresponding air guide hole 2c; one end of the strip groove 2d3 is connected to the other end of the U-shaped groove 2d1, and the other end of the strip groove 2d3 extends to the rear end face of the rear ring 2b. The U-shaped groove 2d1 and the strip groove 2d2 are both arranged on the rear end face of the front ring 2a, which facilitates the formation of the zigzag channel 2d. Preferably, the two ends of the U-shaped groove 2d1 are distributed radially along the air guide cover 2, so that the U-shaped groove 2d1 forms a blockage in front of the strip groove 2d3, which better prevents dust and other impurities from entering through the zigzag channel 2d.

[0031] Further explanation, a strip-shaped conducting groove 2e is also provided on the rear end surface of the front ring 2a, and the conducting groove 2e is provided between two adjacent air guide holes 2c, and the two ends of the conducting groove 2e are respectively connected to the corresponding two air guide holes 2c. The conducting groove 2e opens up a circle of air guide holes 2c to speed up the heat transfer efficiency and speed up the heat dissipation of the motor.

[0032] like Figure 3As shown, both ends of the conducting groove 2e are zigzag, and a heat dissipation hole 2f is opened in the middle of the conducting groove 2e along the axial direction of the air guide cover 2. Both ends of the zigzag conducting groove 2e form a labyrinth seal on both sides of the heat dissipation hole 2f, and on the premise of achieving waterproof and dustproof, multiple groups of heat dissipation channels that directly connect the inside and outside of the motor are added to further accelerate the heat dissipation of the motor.

[0033] In this embodiment,

[0034] Both ends of the conducting groove 2e include a U-shaped zigzag section 2e1, and the two ends of the zigzag section 2e1 are distributed along the circumference of the air guide cover 2. The middle part of the conducting groove 2e is V-shaped, and the middle part of the conducting groove 2e is composed of two straight sections 2e2, and the two ends of the two straight sections 2e2 that are far away from each other are respectively connected to the corresponding two zigzag sections 2e1, and the above-mentioned heat dissipation holes 2f are set at the connection of the two straight sections 2e2. The middle part of the V-shaped conducting groove 2e can form a certain obstruction to further enhance the waterproof and dustproof effects.

[0035] The air deflector 2 is installed as follows: the air deflector 2 is fixedly connected to the outer rotor 1 through a circle of screws 3, and the axis of the screws 3 is parallel to the axis of the air deflector 2. Specifically, the front ring 2a and the outer rotor 1 are axially penetrated by through holes and threaded holes respectively, and the number of through holes, threaded holes and screws 3 is the same and the positions are one-to-one corresponding. Each through hole is penetrated by a screw 3, and the rod of the screw 3 is screwed into the corresponding threaded hole, and the head of the screw 3 is pressed on the front end of the front ring 2a. The preferred type of through hole is a step hole, in which case the head of the screw 3 is in the step hole and pressed tightly against the step surface of the step hole.

[0036] 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. A heat dissipation structure of an outer rotor motor for a fan, comprising a cylindrical outer rotor (1), wherein the rear end of the outer rotor (1) is open, and wherein: A guide cover (2) having an axial cross section that is approximately L-shaped is sleeved and fixed on the front end of the outer rotor (1). The guide cover (2) comprises a front ring (2a) and a rear ring (2b) that are vertically arranged. The inner side surface of the rear ring (2b) is attached to the outer side surface of the outer rotor (1). A circle of air holes (1a) axially penetrates the front end surface of the outer rotor (1). The front ring (2a) is attached to the front end surface of the outer rotor (1) and covers the air holes (1a). Air guide holes (2c) are provided on the rear end surface of the front ring (2a). The number of the air guide holes (2c) and the air holes (1a) are the same and their positions are opposite to each other. The inner wall of the guide cover (2) is provided with strip-shaped zigzag channels (2d) that are the same as the number of the air guide holes (2c). One end of the zigzag channel (2d) extends to the rear end surface of the rear ring (2b). The other end of the zigzag channel (2d) is connected to the corresponding air guide hole (2c).

2. The heat dissipation structure of the outer rotor motor for a fan according to claim 1, characterized in that: The above-mentioned zigzag channel (2d) is composed of a U-shaped groove (2d1) and a strip groove 1 (2d2) and a strip groove 2 (2d3) respectively arranged at two ends of the U-shaped groove (2d1); the U-shaped groove (2d1) and the strip groove 1 (2d2) are both horizontally arranged on the rear end surface of the front ring (2a), and the two ends of the strip groove 1 (2d2) are respectively connected to one end of the U-shaped groove (2d1) and the corresponding air guide hole (2c); one end of the strip groove 2 (2d3) is connected to the other end of the U-shaped groove (2d1), and the other end of the strip groove 2 (2d3) extends to the rear end surface of the rear ring (2b).

3. The heat dissipation structure of the outer rotor motor for a fan according to claim 2, characterized in that: Both ends of the U-shaped groove (2d1) are distributed radially along the air guide cover (2).

4. The heat dissipation structure of the outer rotor motor for a fan according to claim 1, 2 or 3, characterized in that: A strip-shaped conducting groove (2e) is also provided on the rear end surface of the front ring (2a), the conducting groove (2e) is provided between two adjacent air guide holes (2c), and the two ends of the conducting groove (2e) are respectively connected to the corresponding two air guide holes (2c).

5. The heat dissipation structure of the outer rotor motor for a fan according to claim 4, characterized in that: Both ends of the conduction groove (2e) are zigzag, and a heat dissipation hole (2f) is provided in the middle of the conduction groove (2e) along the axial direction of the air guide cover (2).

6. The heat dissipation structure of the outer rotor motor for a fan according to claim 5, characterized in that: Both ends of the conducting groove (2e) comprise a U-shaped meandering section (2e1), and both ends of the meandering section (2e1) are distributed along the circumference of the air guide cover (2).

7. The heat dissipation structure of the outer rotor motor for a fan according to claim 6, characterized in that: The middle portion of the conducting groove (2e) is V-shaped, and the middle portion of the conducting groove (2e) is composed of two straight segments (2e2), and the two ends of the two straight segments (2e2) that are far away from each other are respectively connected to the corresponding two meandering segments (2e1), and the heat dissipation hole (2f) is arranged at the connection between the two straight segments (2e2).

8. The heat dissipation structure of the outer rotor motor for a fan according to claim 1, characterized in that: The deflector cover (2) is fixedly connected to the outer rotor (1) by a circle of screws (3).

9. The heat dissipation structure of the outer rotor motor for a fan according to claim 8, characterized in that: The axis of the screw (3) is parallel to the axis of the air deflector (2).

10. The heat dissipation structure of the outer rotor motor for a fan according to claim 9, characterized in that: The front ring (2a) and the outer rotor (1) are axially penetrated by a through hole and a threaded hole respectively. The through holes, the threaded holes and the screws (3) are the same in number and have corresponding positions. A screw (3) is inserted into each through hole. The rod of the screw (3) is screwed into the corresponding threaded hole. The head of the screw (3) is pressed on the front end of the front ring (2a).

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