Fan motor

Abstract

A fan motor (100) includes: a rotor (10) disposed in a shaft (30) and formed by insert injection molding, the rotor (10) rotating together with the shaft (30); a stator (20) mounted in the direction of the rotor (10); an upper insulator (21) constituting the stator (20), the upper and lower insulators (21, 23) being coupled to the upper and lower parts of the core (22) of the stator (20); a motor holder (60) coupling the upper and lower insulators (21, 23) and the printed circuit board (50); and a rotor separation prevention and damping device (80) installed on a recessed annular groove (31) at the lower end of a shaft (30), the shaft (30) being inserted into a sleeve bearing (40), the sleeve bearing (40) being installed inside an installation protrusion (61) protruding from the center of the motor support (60).

Description

Technical Field

[0001] The present invention relates to a fan motor. More specifically, the present invention relates to a fan motor for a refrigerator, which can shorten the motor assembly process and reduce the manufacturing cost by preventing the rotor from rising and separating when the fan without a top cover bracket rotates, and can improve the performance of the fan motor by absorbing the vibration occurring when the rotor rises and improving the noise reduction efficiency. Background Art

[0002] Generally, a fan motor is used to blow cool air in a refrigerator or circulate air inside and outside the appliance. The fan motor can make the lead wire connected to the external power terminal box contact with the printed circuit board installed in the fan motor, and rotate the fan through the rotating shaft that rotates together with the fan motor rotor according to the control signal of the control circuit.

[0003] Korean Patent No. 10-1869951 discloses a fan motor, which includes a rotor, a stator, a shaft, an oil-free bearing, a printed circuit board, a top cover bracket made of synthetic resin, a fixed mounting bracket made of synthetic resin and fixed to a refrigerator or the like, a motor bracket made of synthetic resin, and a fan rotatably mounted on the shaft.

[0004] The fan motor includes: a rotor, which is placed in the shaft and formed by insert injection molding, and rotates with the shaft; a stator, which is installed in the direction of the rotor; a top covering bracket, which couples the upper insulator constituting the stator with the motor bracket; a motor bracket, which is placed on the fixed mounting bracket, and couples the stator core, the upper and lower insulators and the printed circuit board. The motor bracket includes: a mounting protrusion, which protrudes from the center and has a space inside; a plurality of fixed guides, which protrude inward from the inner circumferential surface at certain intervals; a lead wire outlet hole on one side of the motor bracket, which is electrically connected to the printed circuit board; and a fixing member, which protrudes outward for fixing bolts. When installing the motor bracket, first place the fixing member on the locking protrusion formed inside the fixed mounting bracket, and then fix it with a fixing bolt.

[0005] The prior art with the above configuration uses a coupling device to couple the top cover bracket with the upper part of the motor bracket to avoid the situation where the rotor including the shaft may be separated from the motor bracket when the fan rotates due to the rotational force of the fan blades.

[0006] However, the top covering bracket provided to prevent the rotor from separating prolongs the assembly process, thereby reducing productivity and requiring additional expenses, thereby increasing the manufacturing cost of the motor.

[0007] In addition, when the rotor is lifted by the rotational force of the fan blades while rotating, the upper circumferential surface of the rotor collides with the inner circumferential surface of the top cover bracket, which may damage the top cover bracket, thereby reducing the durability of the motor, and also generate noise, thereby reducing the performance of the motor.

[0008] Therefore, in order to overcome the above problems, the inventors have proposed a fan motor with a novel structure, which can prevent the rotor from separating without coupling with a top cover bracket. Summary of the invention

[0009] Technical issues

[0010] The object of the present invention is to provide a fan motor, with an anti-rotor separation and shock-absorbing device installed at the lower end of the shaft, which can prevent the rotor from separating and absorb vibration when the rotor rises with the help of the rotational force of the fan blades while rotating.

[0011] All of the above and other inherent objects of the present invention can be easily achieved through the description of the present invention as described below.

[0012] Technical Solution

[0013] The fan motor 100 according to the present invention includes: a rotor 10, which is placed in a shaft 30 and formed by insert injection molding, and rotates together with the shaft 30; a stator 20, which is installed toward the rotor 10; an upper insulator 21, which constitutes the stator 20, and the upper insulator 21 and the lower insulator 23 are coupled with the upper and lower parts of the iron core 22 of the stator 20; a motor bracket 60, which couples the upper insulator 21, the lower insulator 23 and the printed circuit board 50; an anti-rotor separation and shock absorbing device 80, which is installed on the concave annular groove 31 at the lower end of the shaft 30, and the shaft 30 is inserted into the sleeve bearing 40, and the sleeve bearing 40 is installed inside the mounting protrusion 61 protruding from the center of the motor bracket 60.

[0014] In the present invention, the anti-rotor separation and vibration-absorbing device 80 may include a washer-shaped body 81 with a mounting hole 81 ′ at the center; and upper and lower vibration-isolating members 82 , 83 coupled to the top and bottom surfaces of the body 81 .

[0015] In the present invention, the mounting protrusion 82A of the upper vibration isolation member 82 and the mounting protrusion 83A of the lower vibration isolation member 83 may be mounted and coupled to a mounting hole 81 ″ passing through between the outer circumference of the mounting hole 81 ′ of the main body 81 and the outer edge of the main body 81 .

[0016] In the present invention, preferably, the noise absorbing member 80A is installed between the installation protrusion 82A of the upper vibration isolating member 82 and the installation protrusion 83A of the lower vibration isolating member 83 .

[0017] In the present invention, preferably, the main body 81 is formed integrally with the upper vibration isolation component 82 and the lower vibration isolation component 83 by insert injection molding.

[0018] Effects of the Invention

[0019] The present invention prevents the rotor from rising and separating when the fan of the fan motor rotates, without coupling the top covering bracket used to prevent the rotor from separating, thereby shortening the motor assembly process, improving productivity and reducing the motor manufacturing cost.

[0020] At the same time, the present invention also improves the durability of the motor without worrying about the rotor colliding with the top covering bracket when rotating.

[0021] At the same time, the present invention utilizes the upper and lower vibration isolation components of the anti-rotor separation and shock absorbing device to absorb the vibration when the rotor rises, thereby preventing damage to the lower circumferential surface of the sleeve bearing, improving the durability of the fan motor, and also significantly increasing the reliability of the motor.

[0022] At the same time, the present invention provides a fan motor that improves noise reduction efficiency by using a rotor separation prevention and shock absorbing device to absorb vibration occurring when the shaft rises. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A coupling perspective view of a fan motor according to the present invention;

[0024] Figure 2 is a cross-sectional view of a fan motor according to the present invention;

[0025] Figure 3 is an exploded perspective view of a fan motor according to the present invention;

[0026] Figure 4 A perspective view of a motor bracket coupling of a fan motor according to the present invention;

[0027] Figure 5 An enlarged cross-sectional view of a motor bracket coupling of a fan motor according to the present invention;

[0028] Figure 6 An enlarged cross-sectional view of the installation state of the anti-motor separation and vibration reduction device of the fan motor according to the present invention;

[0029] Figure 7 An exploded cross-sectional view of the configuration of the anti-motor separation and vibration reduction device of the fan motor according to the present invention;

[0030] Figure 8 The present invention is a combined cross-sectional view of the configuration of the anti-motor separation and vibration reduction device of the fan motor according to the present invention.

[0031] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] Figure 1 is a coupling perspective view of a fan motor according to the present invention, Figure 2 is a cross-sectional view of a fan motor according to the present invention, Figure 3 is an exploded perspective view of a fan motor according to the present invention, Figure 4 It is a perspective view of the motor bracket coupling of the fan motor according to the present invention. Figure 5 It is an enlarged cross-sectional view of the motor bracket coupling of the fan motor according to the present invention, Figure 6 It is an enlarged cross-sectional view of the installation state of the anti-motor separation and vibration reduction device of the fan motor according to the present invention.

[0033] like Figure 1-6 As shown, the fan motor 100 according to the present invention includes a rotor 10 , a stator 20 , a shaft 30 , a sleeve bearing 40 , a printed circuit board 50 , a motor bracket 60 , and a fan 70 rotatably mounted on the shaft 30 .

[0034] The shaft 30 is placed in an insert injection mold and rotated together with the shaft 30 to manufacture the rotor 10 by injection molding. The stator 20 is installed toward the rotor 10, and the rotor 10 rotates by the changing magnetic field generated by the stator 20. The upper insulator 21 and the lower insulator 23 are coupled to the upper and lower parts of the stator 20, respectively.

[0035] The iron core 22 of the stator 20 , the upper and lower insulators 21 , 23 , and the printed circuit board 50 are coupled inside the motor bracket 60 .

[0036] The motor bracket 60 includes a mounting protrusion 61 having a first space 61 ′ protruding from the center thereof, a lead-out hole 62 , and a fixing member 63 .

[0037] The rotor 10 is arranged in such a manner that the inner circumference of the second space 11 formed inside the center of the rotor 10 is arranged around the outer circumference of the mounting protrusion 61 of the motor bracket 60 at a predetermined interval, and the lower portion of the mounting protrusion 61 of the motor bracket 60 forms a third space 6IB having an annular locking step 61A. Reference numeral 90 in the drawings is a fixed mounting bracket.

[0038] The present invention can install the anti-rotor separation and shock-absorbing device 80 on the concave annular groove 31 at the lower end of the shaft 30, and the shaft 30 is inserted into the sleeve bearing 40, and the sleeve bearing 40 is installed inside the mounting protrusion 61 protruding from the center of the motor bracket 60, thereby preventing the rotor 10 from separating when the shaft 30 rises due to the rotational force generated by the rotation of the fan 70.

[0039] Therefore, the present invention can omit the top cover bracket for preventing the rotor 10 from being separated, which is necessarily included in the conventional fan motor, and can also omit the separate coupling device for coupling the top cover bracket and the motor bracket 60. Therefore, the present invention can provide a fan motor 100 with a simple structure, and can also shorten the assembly process and reduce the manufacturing cost of the fan motor.

[0040] See also Figure 5 and 6 When the rotor 10 including the shaft 30 rises due to the rotational force generated by the rotation of the fan 70, the top surface of the anti-rotor separation and damping device 80 contacts the sleeve bearing 40, acting as a stopper. Therefore, without installing the top cover bracket, the rotor 10 and the shaft 30 can be prevented from separating, so that the fan 70 is stably driven. When the rotor 10 descends, the lower surface of the anti-rotor separation and damping device 80 contacts the upper circumferential surface of the annular locking step 61A at the lower part of the mounting protrusion 61, preventing the shaft 30 from descending, thereby allowing the rotor 10 to stably rotate in the horizontal direction of the shaft 30.

[0041] When the rotor 10 rises, the top and bottom surfaces of the rotor separation prevention and shock absorbing device 80 contact the sleeve bearing 40 and the annular locking step 61A. As a result, the sleeve bearing 40 and the lower circumferential surface of the annular locking step 61A may be damaged, or noise may be generated due to vibration during contact. Due to damage to the sleeve bearing 40, the rotation of the shaft 30 may be disturbed. At the same time, due to damage to the annular locking step 61A, when the shaft 30 descends, it may exceed the descent limit, and the lower part of the fan 70 may contact the circumference of the motor bracket 60, causing severe vibration and damage to the fan 70.

[0042] In order to prevent the above situation, the present invention proposes that the anti-rotor separation and vibration reduction device 80 includes: a washer-shaped body 81 with a mounting hole 81' at the center; and an upper vibration isolation member 82 and a lower vibration isolation member 83 coupled to the top and bottom surfaces of the body 81.

[0043] The washer-shaped body 81 may be made of a thin steel plate or an elastic thin steel plate.

[0044] Figure 7 is an exploded cross-sectional view of the configuration of the anti-motor separation and vibration reduction device of the fan motor according to the present invention, Figure 8 The present invention is a combined cross-sectional view of the anti-motor separation and vibration reduction device configuration of the fan motor according to the present invention.

[0045] Preferably, the upper and lower vibration isolating members 82 and 83 are made of synthetic rubber such as fluororubber, nitrile rubber or acrylic rubber, which has excellent sliding and shock absorbing properties.

[0046] In particular, the multiple mounting protrusions 82A of the upper vibration isolation member 82 and the multiple mounting protrusions 83A of the lower vibration isolation member 83 can be installed and coupled to the multiple mounting holes 81" passing through between the outer circumference of the mounting holes 81' of the main body 81 and the outer edge of the main body 81, and can also be adhered and coupled to the multiple mounting holes 81" with an adhesive (not shown).

[0047] The rotor separation prevention and vibration absorbing device 80 having the above-described configuration can be kept stable by reinforcing the main body 81 with the upper vibration isolation member 82 and the lower vibration isolation member 83. Further, when rotating together with the shaft 30, even if the top and bottom surfaces of the upper and lower vibration isolation members 82, 83 contact the lower circumferential surface of the sleeve bearing 40 and the upper circumferential surface of the annular locking step 61A to rotate, since the upper and lower vibration isolation members 82, 83 are made of rubber having excellent sliding properties, the rotor separation prevention and vibration absorbing device 80 can also achieve smooth rotation, prevent noise from occurring during contact, and reduce wear of the upper and lower vibration isolation members 82, 83 on the main body 81.

[0048] When the rotor 10 rises, the upper vibration isolation member 82 of the rotor separation prevention and shock absorbing device 80 reduces the impact when the upper circumferential surface of the upper vibration isolation member 82 contacts the lower circumferential surface of the sleeve bearing 40, thereby preventing damage to the sleeve bearing 40 and absorbing vibration and reducing noise.

[0049] When the rotor 10 descends, the lower vibration isolation member 83 of the anti-rotor separation and shock absorbing device 80 reduces the impact that occurs when the lower circumferential surface of the lower vibration isolation member 83 contacts the upper circumferential surface of the annular locking step 61A, thereby preventing the annular locking step 61A from being damaged, and preventing the shaft 30 from exceeding the descent limit when descending, avoiding severe impact when the lower part of the fan 70 contacts the circumference of the motor bracket 60.

[0050] A noise absorbing member 80A is provided between the mounting protrusion 82A of the upper vibration isolation member 82 and the mounting protrusion 83A of the lower vibration isolation member 83, so that the noise absorbing member 80A can absorb the vibration occurring when the upper and lower vibration isolation members 82 and 83 contact the sleeve bearing 40 and the annular locking step 61A, thereby significantly improving the noise reduction efficiency.

[0051] The present invention can form the main body 81 and the upper and lower vibration isolation members 82 and 83 as one piece by insert injection molding, thereby improving the productivity of the rotor separation prevention and vibration reduction device 80.

[0052] It should be noted that the above description of the present invention is only an example for understanding the present invention and is not intended to limit the scope of the present invention. The protection scope of the present invention is defined by the scope of the attached invention claims, and it should be understood that simple modifications or changes within the scope of the invention claims belong to the scope of the present invention.

Claims

1. A fan motor, comprising: The rotor (10) is placed in the shaft (30) and formed by insert injection molding, and rotates together with the shaft (30); The stator (20) is installed toward the rotor (10); An upper insulator (21) constitutes a stator (20), wherein the upper insulator (21) and a lower insulator (23) are coupled to the upper and lower parts of an iron core (22) of the stator (20); a motor bracket (60) coupling the upper insulator (21), the lower insulator (23) and the printed circuit board (50); and The anti-rotor separation and shock absorbing device (80) is mounted on a concave annular groove (31) at the lower end of a shaft (30), wherein the shaft (30) is inserted into a sleeve bearing (40), and the sleeve bearing (40) is mounted inside a mounting protrusion (61) protruding from the center of a motor bracket (60).

2. The fan motor according to claim 1, wherein: The anti-rotor separation and vibration reduction device (80) comprises: A washer-shaped body (81) having a mounting hole (81') at the center; and The upper vibration isolation member (82) and the lower vibration isolation member (83) are coupled to the top surface and the bottom surface of the main body (81).

3. The fan motor according to claim 2, wherein: The mounting protrusion (82A) of the upper vibration isolation member (82) and the mounting protrusion (83A) of the lower vibration isolation member (83) are mounted and coupled to a mounting hole (81") passing through between the outer circumference of the mounting hole (81') of the main body (81) and the outer edge of the main body (81).

4. The fan motor according to claim 2, wherein: A noise absorbing member (80A) is installed between a mounting protrusion (82A) of an upper vibration isolating member (82) and a mounting protrusion (83A) of a lower vibration isolating member (83).

5. The fan motor according to claim 2, wherein: The main body (81) is integrally formed with the upper vibration isolation component (82) and the lower vibration isolation component (83) by insert injection molding.

Images