A fan and its outer rotor motor

Abstract

The present invention discloses a fan and an outer rotor motor thereof, which belongs to the field of motor technology and aims to overcome the defect of poor waterproof ability of existing outer rotor motors. The outer rotor motor includes a plastic-encapsulated rotor and a plastic-encapsulated stator, and is characterized in that a rotor plastic seal is provided on the plastic-encapsulated rotor, a stator plastic seal is provided on the plastic-encapsulated stator, an annular gap plug-in structure is provided between the rotor plastic seal and the stator plastic seal, a drain port is provided on the gap plug-in structure, and the drain port is located at the lower end of the gap plug-in structure. Since the rotor plastic seal and the stator plastic seal are matched through the gap plug-in structure, it is more difficult for external debris such as dust and liquid to enter the motor, and the IP protection ability of the motor is improved. In addition, the liquid present in the matching gap can be discharged in time through the drain port, reducing the chance of the liquid further entering the motor and damaging the internal structure of the motor, improving the reliability of the motor, and facilitating the use of the motor outdoors.

Description

Technical Field

[0001] The invention belongs to the technical field of motors and relates to a fan and an outer rotor motor thereof. Background Art

[0002] Existing external rotor motors have poor IP protection capabilities and are generally not suitable for outdoor use. If the motor is made more sealed, the gap at the outer joint of the stator and rotor will be smaller. Liquid or steam that enters the gap will not be easily discharged from the joint after liquefaction, and may easily enter the motor further and damage it. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention proposes a fan and an outer rotor motor thereof, aiming to overcome the defect of poor waterproof capability of the existing outer rotor motor.

[0004] The present invention is achieved in that:

[0005] An outer rotor motor includes a plastic-encapsulated rotor and a plastic-encapsulated stator, characterized in that a rotor plastic seal is provided on the plastic-encapsulated rotor, a stator plastic seal is provided on the plastic-encapsulated stator, an annular gap-jointed structure is provided between the rotor plastic seal and the stator plastic seal, and a drain port is provided on the gap-jointed structure, the drain port being located at the lower end of the gap-jointed structure. Because the rotor plastic seal and the stator plastic seal are mated via the gap-jointed structure, it is more difficult for external debris such as dust and liquid to enter the motor, thereby improving the IP protection capability of the motor. Liquid present in the mating gap can be promptly discharged through the drain port, reducing the chance of liquid further entering the motor and damaging the internal structure of the motor, improving the reliability of the motor, and facilitating outdoor use of the motor.

[0006] Preferably, the gap plug-in structure includes an annular dowel located on the stator plastic package and an annular slot located on the rotor plastic package, the annular dowel is inserted into the annular slot, the annular dowel and the annular slot are gap-fitted, and the drain port is located on the annular dowel.

[0007] Preferably, the stator plastic package has multiple layers of annular ribs, and the rotor plastic package has annular slots corresponding to the annular ribs. The combination of the multiple layers of annular ribs and the multiple layers of annular slots forms a labyrinthine structure, making it more difficult for foreign matter to enter the motor and improving the motor's protective capabilities.

[0008] Preferably, the annular insert includes an outer insert and an inner insert, and the drain port includes an outer port located on the outer insert and an inner port located on the inner insert, with the outer and inner ports being staggered. Staggering the inner and outer ports prevents foreign matter from passing directly into the motor through the drain port, thereby reducing the motor's protective capabilities in this area. Furthermore, the staggered inner and outer ports have minimal impact on draining.

[0009] Preferably, the inner opening includes a left opening and a right opening, and the left opening and the right opening are located on different sides of the outer opening. Liquid in the annular slot corresponding to the inner rib can flow downward from the left opening and the right opening, respectively, to reduce liquid accumulation.

[0010] Preferably, the plastic-encapsulated rotor includes a rotating shaft and a magnetic ring, the rotating shaft and the magnetic ring being coaxially fixedly connected by the rotor plastic encapsulation. The plastic-encapsulated stator includes a winding core and a sleeve, the sleeve being fixed to the inner wall of the winding core by the stator plastic encapsulation. The rotating shaft passes through the sleeve, and a bearing is disposed between the rotating shaft and the sleeve. Because the rotating shaft and the magnetic ring are isolated by the rotor plastic encapsulation, and the sleeve and the winding core are isolated by the stator plastic encapsulation, the potential difference generated between the rotating shaft and the bearings during motor operation does not form a loop through the magnetic ring or the winding core, thereby reducing the risk of electrical corrosion of the bearings.

[0011] Preferably, a magnetic steel is fitted onto the inner wall of the magnetic conductive ring, and the rotor is encapsulated with a spacer between adjacent magnetic steels. The end of the spacer extends toward the end surface of the magnetic steel to form an abutment portion, which presses the magnetic steel against the magnetic conductive ring. This makes the fixation of the magnetic steel and the magnetic conductive ring more stable.

[0012] A fan including the above-mentioned outer rotor motor is characterized by including a fan blade fixed to the plastic-encapsulated rotor. The fan blade is provided with a mounting sleeve that is sleeved on the plastic-encapsulated rotor. The rotor plastic seal is provided with a protruding ring, and the protruding ring is provided with an embedding groove, and the end of the mounting sleeve is embedded in the embedding groove. In this way, the rotor plastic seal constrains the end of the mounting sleeve, which can prevent the end of the mounting sleeve from deforming when the fan blade rotates.

[0013] Preferably, a positioning portion is provided on the plastic-encapsulated end surface of the rotor, the positioning portion being offset from the rotating shaft. The fan blades are provided with positioning holes, into which the positioning portion is inserted. The positioning holes and positioning portion cooperate to improve the coaxiality between the fan blades and the plastic-encapsulated rotor, reducing relative wobble. The positioning portion and positioning hole also transmit motor torque to the fan blades, driving the fan blades to rotate together, thereby improving the stability of the motor application.

[0014] Preferably, the rotating shaft of the plastic-encapsulated rotor passes through the rotor plastic and the fan blades, the protruding portion having a thread, and the fan blades are fixed to the plastic-encapsulated rotor by nuts screwed into the rotating shaft. In this way, the fan blades are fixed to the plastic-encapsulated rotor, allowing the fan blades to rotate with the plastic-encapsulated rotor.

[0015] The fan and its outer rotor motor provided by the present invention have a rotor plastic seal and a stator plastic seal that are matched through a gap plug-in structure, which makes it more difficult for dust, liquid and other external debris to enter the motor, thereby improving the IP protection capability of the motor. In addition, liquid present in the matching gap can be discharged in time through the drain port, reducing the chance of liquid further entering the motor and damaging the internal structure of the motor, thereby improving the reliability of the motor and facilitating the outdoor use of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the structural diagram of the fan;

[0017] Figure 2 Schematic diagram of the cross-sectional structure of the fan;

[0018] Figure 3 for Figure 2 A magnified view of the middle part A;

[0019] Figure 4 This is a schematic diagram of the explosion structure of the fan;

[0020] Figure 5 It is a structural diagram of the plastic-sealed stator;

[0021] Figure 6 It is a structural diagram of the plastic-sealed rotor.

[0022] Explanation of the accompanying drawings: 100, plastic-encapsulated rotor; 110, plastic-encapsulated rotor; 111, annular slot; 112, spacer; 113, abutment; 114, embedded groove; 115, positioning portion; 120, rotating shaft; 121, retaining spring; 122, nut; 130, magnetic ring; 140, magnet; 200, plastic-encapsulated stator; 210, plastic-encapsulated stator; 211, annular dowel; 212, inner dowel; 213, outer dowel; 220, winding core; 230, bushing; 231, convex portion; 232, mounting cavity; 233, step surface; 300, fan blade; 310, mounting cylinder; 400, drain port; 410, outer port; 420, inner port; 421, left port; 422, right port; 500, bearing; 510, corrugated gasket. DETAILED DESCRIPTION

[0023] The following will further describe the specific embodiments of the present invention in conjunction with the accompanying drawings to make the technical solution of the present invention easier to understand and grasp. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] This embodiment provides a fan with an outer rotor motor, such as Figure 1-6As shown, it includes a plastic-encapsulated rotor 100 , a plastic-encapsulated stator 200 and a fan blade 300 . The fan blade 300 is fixed on the plastic-encapsulated rotor 100 and rotates as the plastic-encapsulated rotor 100 rotates.

[0025] A rotor seal 110 is provided on the seal rotor 100, and a stator seal 210 is provided on the seal stator 200. An annular gap plug-in structure is provided between the rotor seal 110 and the stator seal 210, and a drain port 400 is provided on the gap plug-in structure. The drain port 400 is located at the lower end of the gap plug-in structure. Since the rotor seal 110 and the stator seal 210 are matched through the gap plug-in structure, it is more difficult for external debris such as dust and liquid to enter the motor, thereby improving the IP protection capability of the motor. In addition, the liquid in the matching gap can flow downward under the action of gravity, so that it can flow to the drain port 400 located at the lower end of the gap plug-in structure, and can be discharged in time through the drain port 400, thereby reducing the chance of liquid further entering the motor and damaging the internal structure of the motor, improving the reliability of the motor, and facilitating the outdoor use of the motor.

[0026] like Figure 2-3 As shown, the gap-jointed structure includes an annular rib 211 on the stator plastic package 210 and an annular slot 111 on the rotor plastic package 110. The rib 211 is inserted into the slot 111, and the rib 211 and the slot 111 are loosely fitted. The drain port 400 is located on the rib 211. The loose fit between the rib 211 and the slot 111 ensures smooth relative rotation between the rotor plastic package 110 and the stator plastic package 210. The gap-jointed fit increases the path and tortuosity of the gap at the fitting point, making it more difficult for foreign matter to enter the motor.

[0027] The stator plastic package 210 has multiple layers of annular ribs 211, and the rotor plastic package 110 has annular slots 111 corresponding to the annular ribs 211. Specifically, the rotor plastic package 110 has an equal number of annular slots 111 as the annular ribs 211, and these slots 111 are paired with each other. The combination of the multiple layers of annular ribs 211 and the multiple layers of annular slots 111 creates a labyrinthine structure, making it more difficult for foreign matter to enter the motor and enhancing the motor's protection capabilities. In other optional embodiments, the stator plastic package 210 may have only one layer of annular ribs 211.

[0028] The annular insert 211 includes an outer insert 213 and an inner insert 212. The drain port 400 includes an outer port portion 410 located on the outer insert 213 and an inner port portion 420 located on the inner insert 212. The outer port portion 410 and the inner port portion 420 are staggered. This staggered arrangement of the inner port portion 420 and the outer port portion 410 prevents foreign matter from passing directly into the motor through the drain port 400, thereby reducing the motor's protective capabilities in this area. Furthermore, the staggered arrangement of the inner port portion 420 and the outer port portion 410 has minimal impact on liquid drainage.

[0029] Further, such as Figure 5 As shown, the inner opening 420 includes a left opening 421 and a right opening 422, which are located on different sides of the outer opening 410. The liquid in the annular slot 111 corresponding to the inner rib 212 can flow downward from the left opening 421 and the right opening 422, respectively, to reduce liquid accumulation.

[0030] like Figure 2 As shown, the encapsulated rotor 100 includes a rotating shaft 120 and a magnetic ring 130, which are coaxially fixedly connected by the rotor encapsulation 110. The encapsulated stator 200 includes a winding core 220 and a sleeve 230. The sleeve 230 is fixed to the inner wall of the winding core 220 through the stator encapsulation 210. The rotating shaft 120 passes through the sleeve 230, and a bearing 500 is disposed between the rotating shaft 120 and the sleeve 230. Because the rotating shaft 120 and the magnetic ring 130 are isolated by the rotor encapsulation 110, and the sleeve 230 and the winding core 220 are isolated by the stator encapsulation 210, the potential difference generated between the rotating shaft 120 and the bearing 500 during motor operation does not form a loop through the magnetic ring 130 or the winding core 220, reducing the risk of electrical corrosion of the bearing 500. The shaft sleeve 230 is provided with a protrusion 231 , which is embedded in the stator plastic package 210 to improve the matching stability between the shaft sleeve 230 and the stator plastic package 210 .

[0031] like Figure 6 Magnetic steel 140 is attached to the inner wall of the magnetic ring 130. The rotor plastic package 110 has spacers 112 in the gaps between adjacent magnetic steels 140. The ends of the spacers 112 extend toward the end faces of the magnetic steels 140 to form abutment portions 113. The abutment portions 113 press the magnetic steels 140 against the magnetic ring 130. This ensures a more stable fixation between the magnetic steels 140 and the magnetic ring 130.

[0032] like Figure 3 As shown, the fan blade 300 is provided with a mounting tube 310 that fits over the encapsulated rotor 100. The rotor encapsulation is provided with a raised ring, which is provided with an embedding groove 114. The end of the mounting tube 310 fits into the embedding groove 114. This constrains the rotor encapsulation 110 against the end of the mounting tube 310, preventing deformation of the end of the mounting tube 310 during rotation of the fan blade 300. If the mounting tube 310 deforms, the encapsulated rotor 100 will become eccentric during rotation, which can easily cause motor vibration and noise, accelerating motor damage.

[0033] Positioning features 115 are provided on the end surface of the rotor plastic package 110. Positioning features 115 are offset from the rotating shaft 120 and comprise three positioning posts evenly surrounding the rotating shaft 120. In other embodiments, the number of positioning posts may be two, four, or more. Positioning holes are provided on the fan blades 300, into which the positioning features 115 are inserted. The positioning holes and positioning features 115 work together to improve the coaxiality between the fan blades 300 and the plastic package rotor 100, reducing relative motion and enhancing the stability of the motor.

[0034] like Figure 1-2 As shown, the rotating shaft 120 of the plastic-encapsulated rotor 100 extends beyond the rotor plastic and the fan blades 300. The extending portion is threaded. The fan blades 300 are secured to the plastic-encapsulated rotor 100 via nuts 122 that are screwed into the rotating shaft 120. This secures the fan blades 300 to the plastic-encapsulated rotor 100, allowing them to rotate with the plastic-encapsulated rotor 100. In other optional embodiments, the rotating shaft 120 may not extend beyond the fan blades 300. This reduces the possibility of contact between the rotating shaft 120 and other components, creating a circuit, and improves the motor's ability to protect the bearings 500 from electrical corrosion. The fan blades 300 may be secured to the plastic-encapsulated rotor 100 via other screws or bolts secured to the plastic-encapsulated rotor 100.

[0035] The sleeve 230 has mounting cavities 232 at both ends, and the bearing 500 is mounted in these cavities. The diameter of the mounting cavities 232 is larger than the diameter of the central through-hole in the sleeve 230. This allows the bearing 500 to be more stably mounted in the sleeve 230. The first end of the rotating shaft 120 is fixedly connected to the rotor plastic package 110. The first end of the rotating shaft 120 is provided with a knurled or milled surface to prevent relative circumferential rotation and axial movement between the rotating shaft 120 and the rotor plastic package 110. The second end of the rotating shaft 120 is provided with a retaining groove, and a retaining spring 121 is provided in the retaining groove to retain the bearing 500. In this way, the plastic-encapsulated rotor 100 is constrained to the bearing 500 via the rotating shaft 120 and is rotationally connected to the plastic-encapsulated stator 200.

[0036] A stepped surface 233 is formed adjacent to the mounting cavity 232 and the central through hole, and a corrugated gasket 510 is disposed between the stepped surface 233 and the bearing 500. The corrugated gasket 510 improves the relative position stability of the plastic-encapsulated rotor 100 and the plastic-encapsulated stator 200 and reduces relative movement along the circumference of the rotating shaft 120.

Claims

1. An outer rotor motor, comprising a plastic-encapsulated rotor (100) and a plastic-encapsulated stator (200), characterized in that: A rotor plastic seal (110) is provided on the plastic-sealed rotor (100), a stator plastic seal (210) is provided on the plastic-sealed stator (200), an annular gap plug-in structure is provided between the rotor plastic seal (110) and the stator plastic seal (210), a liquid discharge port (400) is provided on the gap plug-in structure, and the liquid discharge port (400) is located at the lower end of the gap plug-in structure; The gap plug-in structure comprises an annular insert (211) located on the stator plastic package (210) and an annular slot (111) located on the rotor plastic package (110), the annular insert (211) is inserted into the annular slot (111), the annular insert (211) and the annular slot (111) are gap-fitted, and the drain port (400) is located on the annular insert (211); The stator plastic package (210) has multiple layers of annular inserts (211), and the rotor plastic package (110) has annular slots (111) corresponding to the inserts; The annular insert rib (211) includes an outer insert rib (213) and an inner insert rib (212); the drainage port (400) includes an outer port position (410) located on the outer insert rib (213) and an inner port position (420) located on the inner insert rib (212); the outer port position (410) and the inner port position (420) are staggered.

2. The outer rotor motor according to claim 1, characterized in that: The inner opening position (420) comprises a left opening position (421) and a right opening position (422), and the left opening position (421) and the right opening position (422) are respectively located on different sides of the outer opening position (410).

3. The outer rotor motor according to claim 1, characterized in that: The plastic-encapsulated rotor (100) comprises a rotating shaft (120) and a magnetic ring (130), wherein the rotating shaft (120) and the magnetic ring (130) are fixedly connected coaxially via the rotor plastic encapsulation (110), and the plastic-encapsulated stator (200) comprises a winding core (220) and a shaft sleeve (230), wherein the shaft sleeve (230) is fixed to the inner wall of the winding core (220) via the stator plastic encapsulation (210), and the rotating shaft (120) passes through the shaft sleeve (230), and a bearing (500) is provided between the rotating shaft (120) and the shaft sleeve (230).

4. The outer rotor motor according to claim 3, characterized in that: A magnetic steel (140) is fitted on the inner wall of the magnetic conductive ring (130), and the rotor plastic package (110) has a spacer (112) in the gap between adjacent magnetic steels (140). The end of the spacer (112) extends toward the end surface of the magnetic steel (140) to form a supporting portion (113), and the supporting portion (113) presses the magnetic steel (140) onto the magnetic conductive ring (130).

5. A fan comprising the outer rotor motor according to any one of claims 1 to 4, characterized in that: The invention comprises a fan blade (300) fixed on the plastic-sealed rotor (100), wherein the fan blade (300) is provided with a mounting tube, and the fan blade is sleeved on the plastic-sealed rotor (100) through the mounting tube (310); a convex ring is provided on the rotor plastic seal, and an embedding groove (114) is provided on the convex ring, and an end of the mounting tube (310) is embedded in the embedding groove (114).

6. The fan according to claim 5, characterized in that A positioning portion (115) is provided on the end surface of the rotor plastic package (110), the positioning portion (115) is staggered from the rotating shaft (120), a positioning hole is provided on the fan blade (300), and the positioning portion (115) is inserted into the positioning hole.

7. The fan according to claim 5, characterized in that The rotating shaft (120) of the plastic-encapsulated rotor (100) passes through the rotor plastic and the fan blade (300), and the passing portion has a thread. The fan blade (300) is fixed to the plastic-encapsulated rotor (100) by a nut (122) screwed into the rotating shaft (120).

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