JP3850164B2 - Fan device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fan device having a configuration in which a motor frame is sandwiched between a stator and a bearing bracket.
[0002]
[Problems to be solved by the invention]
FIG. 7 shows a fan device described in Japanese Patent Application No. 10-195814. Here, the stator 1 has a stator core 2, a plurality of coils 3, and a coil mold layer 4 made of synthetic resin, and a substantially T-shaped bearing bracket 5 is formed on the inner peripheral surface of the stator 1 from both axial sides. It is mated. A bearing metal 6 is held in the both bearing brackets 5, and a rotating shaft 8 of a rotor 7 is rotatably supported on the both bearing metals 6.
[0003]
The rotor 7 has a cylindrical rotor yoke 9 whose one end face is closed and a plurality of rotor magnets 10 fixed to the inner peripheral surface of the rotor yoke 9, and the surface of the rotor yoke 9 is a yoke mold layer 11 made of synthetic resin. Covered by. The yoke mold layer 11 is formed on the basis of pouring molten resin with the rotor yoke 9 housed in a mold (insert molding). The yoke mold layer 11 is integrally formed with a fan 12. Yes.
[0004]
In the case of the above configuration, the motor frame 13 is sandwiched between the one bearing bracket 5 and the coil mold layer 4 of the stator 1 to fix the motor frame 13 to the product. For this reason, vibration or the like due to unbalance of the fan 12 is transmitted from the rotor 7 to the motor frame 13 through the stator 1 and the motor frame 13 may vibrate. Then, since vibration is transmitted from the motor frame 13 to the product, there is a possibility that the quietness of the product is impaired.
[0005]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a fan device capable of suppressing vibration of a motor frame.
[0006]
[Means for Solving the Problems]
  The fan device according to claim 1 includes a stator having a stator core around which a coil is wound, a bearing bracket that is fitted to an inner peripheral surface of the stator from both sides in the axial direction, and holds the bearing, and the stator and the one bearing A motor frame sandwiched between brackets, a rotor having a rotating shaft rotatably supported by the bearings, and a fan that rotates together with the rotating shaft,The rotor has a cylindrical rotor yoke, the fan is formed of a synthetic resin on the outer peripheral surface of the rotor yoke, and the fan is formed on one end surface of the rotor yoke to correct the balance of the rotor. Balance holes are provided that are blocked by a synthetic resin that is a material forHowever, it has the characteristics.
  According to the above means,The balance of the rotor yoke can be intentionally broken based on the formation of the balance hole, and the overall balance of the rotor can be increased based on offsetting the unbalance in forming the fan by the intentional unbalance of the rotor yoke. For this reason, since vibration of the rotor is suppressed, vibration transmitted from the rotor to the stator and the motor frame is reduced, and vibration of the motor frame is suppressed.
[0007]
  The fan device according to claim 2,A plurality of balance holes are provided at one end face of the rotor yoke at substantially equal angles in the circumferential direction, and the diameter dimension of at least one balance hole is different from the remaining balance holes.However, it has the characteristics.
  According to the above means,The overall balance of the rotor can be adjusted in units of (360 / number of balance holes) °.
[0008]
  The fan device according to claim 3 is:A plurality of balance holes are provided on one end surface of the rotor yoke so as to correspond to the plurality of blades of the fan.However, it has the characteristics.
  According to the above means,Since the balance of the plurality of blades can be individually adjusted based on the opening amounts and positions of the plurality of balance holes, the overall balance of the rotor is further increased and the vibration of the motor frame is further suppressed.
[0009]
  The fan device according to claim 4 is:An engaging portion is provided on the outer peripheral surface of the rotor yoke, and an engaged portion that engages with the engaging portion is integrally formed with the fan.However, it has the characteristics.
  According to the above means,The fan is prevented from being displaced in the axial direction with respect to the rotor yoke.
[0010]
  The fan device according to claim 5 is:An elastic member interposed between the motor frame and the stator, and a cylindrical portion provided in the motor frame and extending in the axial direction, the cylindrical portion interposed between one bearing bracket and the stator, and The member is fitted to the outer peripheral surface of the cylindrical portionHowever, it has the characteristics.
  According to the above means,Vibration transmitted from the rotor through the stator is absorbed by the elastic member. For this reason, since it is difficult for vibration to be transmitted from the stator to the motor frame, vibration of the motor frame is suppressed. In addition, since the space between the stator and the motor frame is blocked by the elastic member, moisture or the like hardly enters the stator through the space between the stator and the motor frame. Moreover, since the space between the stator and the bearing bracket is closed in the axial direction by the cylinder portion of the motor frame, moisture and the like are less likely to enter the interior of the stator through the space between them. Furthermore, the elastic member is prevented from coming off due to vibration or the like.
[0011]
  The fan device according to claim 6 is:A terminal block having a connector on the stator is provided, mounting pieces are provided through a plurality of stays arranged radially on the motor frame, and the connector is housed in a predetermined stay among the plurality of stays. An elastic member is interposed between the portion and the predetermined stayHowever, it has the characteristics.
  According to the above means,Since the connector is housed in a predetermined stay of the motor frame, the fan blowing capacity is increased. In addition, an elastic member is interposed between the tip of the connector and a predetermined stay. For this reason, since the vibration transmitted from the rotor through the stator and the connector is absorbed by the elastic member, it is possible to suppress the vibration of the motor frame due to the influence of the connector.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, in FIG. 4A, the refrigerator main body 21 has a rectangular box shape with an open front, and the refrigerator main body 21 has a refrigerator room 22, a vegetable room 23, a select room 24, an ice making room 25, a freezer. A chamber 26 is defined.
[0017]
As shown in FIG. 4B, an R cold air generation chamber 27 is formed on the rear wall of the refrigerator main body 21 at the rear of the vegetable compartment 23, and the R cold air generation chamber 27 has a refrigeration cycle. R evaporator 28 is provided. Further, an F cold air generation chamber 29 is formed on the rear wall of the refrigerator main body 21 at the rear of the three chambers of the select chamber 24, the ice making chamber 25, and the freezing chamber 26. A cycle F evaporator 30 is provided.
[0018]
A machine room 31 is formed at the bottom of the rear wall of the refrigerator body 21, and a compressor 32 for a refrigeration cycle is disposed in the machine room 31 as shown in FIG. ing. An R evaporator 28 and an F evaporator 30 are connected to the discharge port of the compressor 32, and refrigerant is supplied to the R evaporator 28 and the F evaporator 30 from the compressor 32.
[0019]
As shown in FIG. 4B, an R fan device 33 is disposed in the R cool air generation chamber 27, and the R fan device 33 draws cold air based on suction of air through the R evaporator 28. It produces | generates and it ventilates in the vegetable compartment 23 and the refrigerator compartment 22. Further, an F fan device 34 is disposed in the F cool air generation chamber 29. The F fan device 34 has the same configuration as the R fan device 33, and generates cold air based on the suction of air through the F evaporator 30, and the inside of the select chamber 24, the ice making chamber 25, and the freezer chamber 26. To blow.
[0020]
1 to 3 show the mechanical structure of the R fan device 33 and the F fan device 34. Hereinafter, detailed configurations of the R fan device 33 and the F fan device 34 will be described. As shown in FIGS. 2A and 2B, the motor frame 35 is formed by injection-molding synthetic resin into a cylindrical shape. The rear surface of the motor frame 35 is shown in FIG. As shown, a cylindrical cylindrical portion 36 is integrally formed, and an annular rib 37 having a triangular cross section is integrally formed on the inner peripheral surface of the cylindrical portion 36.
[0021]
An annular recess 38 is formed on the outer surface of the cylindrical portion 36 on the rear surface of the motor frame 35. The recess 38 corresponds to an elastic member as shown in FIG. An annular rubber plate 39 is fitted. The inner diameter dimension of the rubber plate 39 is set to be smaller than the outer diameter dimension of the cylindrical portion 36 when not fitted to the outer peripheral surface of the cylindrical portion 36, and a part of the rubber plate 39 is formed on the outer peripheral surface of the cylindrical portion 36. It is in close contact.
[0022]
On the outer peripheral surface of the motor frame 35, as shown in FIG. 2A, three narrow ties 40 and one wide stylus 41 arranged in a radial pattern are integrally formed. The latter wide stay 41, as shown in FIGS. 2B and 2C, is shown in FIG. 2B and FIG. 2D. As shown in FIGS. 2A and 2B, the upper end portion of the lead wire housing portion 43 has an upper surface as shown in FIGS. Is formed with a recess 44.
[0023]
An annular stay frame 45 is integrally formed at the tip of the three narrow stays 40 and the tip of the one wide stay 41, and the stay frame 45 is formed integrally with the stay frame 45 as shown in FIG. As shown, a bell mouth 46 is integrally formed. In addition, as shown in FIG. 2A, three attachment pieces 47 are integrally formed on the stay frame 45, and the motor frame 35 fixes each attachment piece 47 to the wall surface of the refrigerator main body 11. Is assembled to the refrigerator main body 11.
[0024]
A bearing bracket 48 is assembled to the motor frame 35 as shown in FIG. The bearing bracket 48 is formed by drawing a metal plate into a substantially T shape, and is based on being press-fitted into the inner peripheral surface of the rib 37 of the cylindrical portion 36 as shown in FIG. It is fixed to the motor frame 35.
[0025]
As shown in FIG. 1A, a metal cover 49 is fitted to the inner peripheral surface of the bearing bracket 48, and the front opening of the bearing bracket 48 is closed by the cover 49. The cover 49 is integrally formed with a projecting spring mounting portion 50, and a synthetic resin thrust plate 51 is fixed to the spring mounting portion 50.
[0026]
A front end portion of a presser spring 52 is fitted to the outer peripheral surface of the spring mounting portion 50. The presser spring 52 is formed of a compression coil spring, and a metal presser 53 is attached to the rear end portion of the presser spring 52. A bearing metal 54 is housed in the bearing bracket 48, and the metal retainer 53 is engaged with the outer peripheral surface of the bearing metal 54 by the spring force of the retainer spring 52, as shown in FIG. The bearing metal 54 is pressed against the inner peripheral surface of the bearing bracket 48.
[0027]
As shown in FIG. 1A, an annular felt 55 is disposed in the bearing bracket 48, and a cylindrical felt 56 is disposed in the cover 49. The felts 55 and 56 are impregnated with lubricating oil, and the bearing metal 54 is lubricated by the lubricating oil that oozes out of the felts 55 and 56. Reference numeral 57 denotes a front bearing assembly having a bearing bracket 48, a cover 49, a thrust plate 51, a presser spring 52, a metal presser 53, a bearing metal 54, and felts 55 and 56.
[0028]
The inner peripheral surface of the stator core 58 is press-fitted into the rear end portion of the bearing bracket 48 of the front bearing assembly 57 at the outer peripheral surface. The stator core 58 is formed by laminating a plurality of steel plates, and an insulating layer 59 made of synthetic resin is formed on the surface of the stator core 58 except for the inner and outer peripheral surfaces. This insulating layer 59 is formed on the basis of injecting a molten resin in a state where the stator core 58 is housed in a mold (not shown). 60, a V-phase coil 60, and a W-phase coil 60 are wound.
[0029]
A plurality of pin terminals (not shown) extending forward are fixed to the front surface of the insulating layer 59, and the U-phase coil 60 to the W-phase coil 60 are electrically connected to the pin terminals based on winding the terminal portion around the pin terminals. Connected. A terminal block 61 is mounted on the front surface of the insulating layer 59. A plurality of terminal plates 62 are embedded in the terminal block 61, and the U-phase coil 60 to W-phase coil 60 are electrically connected to the terminal plate 62 based on soldering pin terminals to the terminal plate 62. ing.
[0030]
The terminal block 61 is integrally formed with a box-shaped connector 63 having an open bottom surface. The connector 63 is housed in the connector housing portion 42 of the wide stay 41 and closes the rear surface opening portion of the connector housing portion 42. . The lower end portion of the connector 63 is inserted into the concave portion 44 of the wide stay 41. Between the lower end portion of the connector 63 and the inner surface of the concave portion 44, as shown in FIGS. In addition, a gap is formed.
[0031]
As shown in FIG. 1A, the stator core 58 is formed with a coil mold layer 64 made of synthetic resin. The coil mold layer 64 is mounted with the U-phase coil 60 to the W-phase coil 60 and the terminal block 61 and electrically connected to the stator core 58, and then the stator core 58 is accommodated in a molding die (not shown) to melt the resin. The entire surface of the U-phase coil 60 to the W-phase coil 60, the entire surface excluding the connector 63 of the terminal block 61, the soldered portion between each pin terminal and the terminal plate 62, etc. Is covered with a coil mold layer 64.
[0032]
The outer peripheral surface of the cylindrical portion 36 of the motor frame 35 is fitted to the inner peripheral surface of the coil mold layer 64, and the rubber plate 39 of the motor frame 35 is connected to the motor frame 35 as shown in FIG. And the coil mold layer 64. 1 indicates a stator assembly corresponding to a stator. The stator assembly 65 includes a stator core 58, an insulating layer 59, a U-phase coil 60 to a W-phase coil 60, a terminal block 61, and a connector. 63, a coil mold layer 64, and the like.
[0033]
As shown in FIG. 1A, a pair of connectors 66 are fitted to the connector 63, and each terminal plate 62 of the terminal block 61 is connected to a terminal (not shown) of the pair of connectors 66. ing. A lead wire 67 is connected to each terminal of the pair of connectors 66, and each lead wire 67 is housed in the lead wire housing portion 43 of the wide stay 41. The lead wire storage portion 43 is covered with a synthetic resin cover (not shown), and the front opening of the lead wire storage portion 43 is closed by the cover.
[0034]
An inverter circuit (not shown) is connected to the lead wire 67 of the pair of connectors 66. A commercial AC power supply (not shown) is connected to the inverter circuit via a rectifier circuit (not shown), and the U-phase coil 60 to W-phase coil 60 are connected to the inverter circuit, lead wire 67, terminal from the rectifier circuit. A rotating magnetic field is generated based on the application of a DC power source through the plate 62 and the pin terminal.
[0035]
As shown in FIG. 1A, an annular synthetic resin collar 68 is press-fitted on the inner peripheral surface of the stator core 58, and a plurality of protrusions 69 are integrally formed on the front surface of the collar 68. Has been. The rear bearing assembly 70 includes a bearing bracket 48, a cover 49, a presser spring 52, a metal presser 53, a bearing metal 54, and felts 55 and 56. The front end of the bearing bracket 48 is press-fitted, and the plurality of protrusions 69 of the collar 68 are sandwiched between the bearing brackets 48.
[0036]
A front end portion and a rear end portion of the rotating shaft 71 are rotatably supported in the bearing metal 54 of the front bearing assembly 57 and in the bearing metal 54 of the rear bearing assembly 70, and the front end portion of the rotating shaft 71 is supported by the front bearing assembly. The rear end portion of the rotary shaft 71 passes through the cover 49 of the rear bearing assembly 70 and protrudes rearward. A small diameter portion 72 is formed on the rotating shaft 71, and the small diameter portion 72 is rotatably inserted into the collar 68.
[0037]
A rotor yoke 73 is fixed to the rear end portion of the rotating shaft 71. The rotor yoke 73 is formed by drawing a steel plate into a cylindrical shape with a closed rear surface. An annular recess 74 is formed on the outer peripheral surface of the rotor yoke 73 so as to open to the outer peripheral side. A plurality of rotor magnets 75 are fixed at equal intervals in the circumferential direction on the inner peripheral surface of the rotor yoke 73, and the rotor yoke 73 rotates based on the fact that the U-phase coil 60 to the W-phase coil 60 generate a rotating magnetic field. It rotates around the shaft 71. The recess 74 corresponds to an engagement portion.
[0038]
As shown in FIG. 3, three balance holes 76 having a small diameter and one balance hole 76 having a large diameter are formed on the rear surface of the rotor yoke 73. These four balance holes 76 are spaced apart at equal intervals (90 °) in the circumferential direction, and the balance with respect to the rotating shaft 71 of the rotor yoke 73 is three balance holes 76 having a small diameter and one balance hole 76 having a large diameter. The amount and direction are intentionally destroyed by
[0039]
As shown in FIG. 1A, a synthetic resin yoke mold layer 77 is formed on the surface of the rotor yoke 73, and an annular shape protruding toward the inner peripheral side at the rear end portion of the yoke mold layer 77. The protrusion 78 is integrally formed. The protrusion 78 corresponds to the engaged portion, and is fitted in the recess 74 of the rotor yoke 73. Further, on the rear surface of the yoke mold layer 77, there are integrally formed three small-diameter projections 79 (only one is shown) and one large-diameter projection 79 protruding forward. Each protrusion 79 is fitted in the small diameter balance hole 76 of the rotor yoke 73, and the large diameter protrusion 79 is fitted in the large diameter balance hole 76.
[0040]
As shown in FIG. 3, a cylindrical fan wall 80 is integrally formed on the yoke mold layer 77. An axial flow type fan 81 is integrally formed on the fan wall portion 80, and the fan 81 blows air based on rotation integrally with the rotor yoke 73. The fan 81 has four blades 82 arranged at equal pitches (90 °) in the circumferential direction, and the predetermined three blades 82 are in contact with the three small balance holes 76 of the rotor yoke 73. The remaining one blade 82 is opposed to the large balance hole 76 in the radial direction.
[0041]
1 indicates a rotor assembly corresponding to a rotor. The rotor assembly 83 includes a rotating shaft 71, a rotor yoke 73, a plurality of rotor magnets 75, a yoke mold layer 77, and a fan 81. is doing.
[0042]
The yoke mold layer 77, the fan 81, and the like are formed by injecting molten resin in a state where the rotor yoke 73 is housed in a mold (not shown). An imbalance occurs due to the position of the gate and the flow state of the molten resin. For example, when the fan 81 is molded in the direction shown in FIG. 3, the center of gravity of the fan 81 is biased downward.
[0043]
The balance hole 76 of the rotor yoke 73 is configured so that, for example, when the center of gravity of the fan 81 is biased downward, the rotor yoke 73 is accommodated in the mold so that the large-diameter balance hole 76 faces downward. It functions as a mark for positioning in the circumferential direction in the mold, and the unbalance at the time of molding of the fan 81 is offset by the intentional unbalance of the rotor yoke 73, and the balance of the rotor assembly 83 is enhanced as a whole. ing. The R fan device 33 and the F fan device 34 are configured as described above.
[0044]
Next, the assembly procedure of the R fan device 33 and the F fan device 34 will be described.
(1) The rubber plate 39 is pushed into the outer peripheral surface of the cylindrical portion 36 of the motor frame 35, and the rubber plate 39 is fitted into the recess 38 of the motor frame 35.
(2) The bearing bracket 48 of the front bearing assembly 57 is press-fitted into the cylindrical portion 36 of the motor frame 35, and the front bearing assembly 57 is assembled to the motor frame 35.
[0045]
(3) The bearing bracket 48 of the front bearing assembly 57 is press-fitted into the inner peripheral surface of the stator core 58 of the stator assembly 65 from the front through the coil mold layer 64, and the front bearing assembly 57 is assembled to the stator assembly 65. At this time, the rubber plate 39 is sandwiched between the coil mold layer 64 and the motor frame 35, and the gap between the coil mold layer 64 and the motor frame 35 is closed by the rubber plate 39.
(4) A collar 68 is press-fitted into the inner peripheral surface of the stator core 58 of the stator assembly 65 from behind.
[0046]
(5) The bearing bracket 48 of the rear bearing assembly 70 is press-fitted into the inner peripheral surface of the stator core 58 of the stator assembly 65 from the rear through the coil mold layer 64, and the rear bearing assembly 70 is assembled to the stator assembly 65.
(6) The front end portion of the rotating shaft 71 of the rotor assembly 83 is inserted from the bearing metal 54 of the rear bearing assembly 70 into the bearing metal 54 of the front bearing assembly 57. At this time, the front end portion of the rotating shaft 71 presses the collar 68, and the collar 68 is elastically deformed. Then, based on the fact that the front end portion of the rotating shaft 71 passes through the collar 68 and the small diameter portion 72 of the rotating shaft 71 is inserted into the inner peripheral surface of the collar 68 in a retaining state, the rotor assembly 87 is moved to the front bearing assembly 57, The stator assembly 65 and the rear bearing assembly 70 are assembled.
[0047]
As shown in FIG. 4A, a C fan device 84 is disposed in the machine room 31. The C fan device 84 generates cooling air for the compressor 32, and the R fan device 33 and the F fan device described above except that the rubber plate 39 is not interposed between the motor frame 35 and the coil mold layer 64. 34 and the same configuration.
[0048]
According to the first embodiment, since the rubber plate 39 is interposed between the motor frame 35 and the coil mold layer 64 of the stator assembly 65, the vibration transmitted from the rotor assembly 83 through the stator assembly 65 is absorbed by the rubber plate 39. The For this reason, since it is difficult for vibration to be transmitted from the stator assembly 65 to the motor frame 35, vibration of the motor frame 35 is suppressed. Therefore, the wall surface of the refrigerator main body 11 is prevented from vibrating to generate vibration noise, so that the quietness of the refrigerator is enhanced.
[0049]
Further, since the rubber plate 39 is interposed between the motor frame 35 and the coil mold layer 64, the gap between the motor frame 35 and the coil mold layer 64 is closed by the rubber plate 39. For this reason, it is difficult for moisture such as cold air to enter the stator assembly 65 through the coil mold layer 64 and the motor frame 35, so that dew condensation is prevented from occurring in the stator assembly 65.
[0050]
Further, since the cylinder portion 36 is provided in the motor frame 35, the rotating shaft 71 is positioned on the axis of the stator core 58 via the bearing metal 54, the bearing bracket 48, and the cylinder portion 36. For this reason, the radial gap between the rotor magnet 75 and the stator core 58 becomes uniform, the magnitude of cogging torque becomes uniform, and the minimum value becomes small, so that magnetic imbalance is reduced. Accordingly, the vibration transmitted from the rotor assembly 83 to the stator assembly 65 is reduced, so that the vibration of the motor frame 35 is further suppressed.
[0051]
Further, since the cylindrical portion 36 is provided on the motor frame 35, the cylindrical portion 36 covers the axial direction between the coil mold layer 64 of the stator assembly 65 and the front bearing bracket 48. For this reason, moisture such as cold air is less likely to enter the stator assembly 65 between the coil mold layer 64 and the front bearing bracket 48, so that condensation is less likely to occur in the stator assembly 65.
[0052]
Further, since the rubber plate 39 is fitted to the outer peripheral surface of the cylinder portion 36 of the motor frame 35, the rubber plate 39 is prevented from coming off due to vibration or the like. Moreover, since the rubber plate 39 is interposed between the motor frame 35 and the coil mold layer 64 simply by fitting the cylindrical portion 36 to the inner peripheral surface of the coil mold layer 64 of the stator assembly 65, The workability is improved.
[0053]
The connector 63 is housed in the wide stay 41 of the motor frame 35. For this reason, the connector 63 is prevented from becoming a blowing resistance of the fan 81, so that the blowing capacity of the fan 81 is enhanced. Moreover, a gap is formed between the lower end portion of the connector 63 and the wide stay 41. This makes it difficult for vibration to be transmitted from the rotor assembly 83 to the lead wire storage portion 43 of the stay 41 through the stator assembly 65 and the connector 63, so that the thin lead wire storage portion 43 of the motor frame 35 vibrates due to the influence of the connector 63. Is suppressed.
[0054]
Moreover, the balance with respect to the rotating shaft 71 of the rotor yoke 73 was intentionally broken on the basis of the three small-diameter balance holes 76 and the large-diameter balance hole 76 formed in the rotor yoke 73. For this reason, the unbalance in molding of the fan 81 is offset by the intentional unbalance of the rotor yoke 73, and the overall balance of the rotor assembly 83 is increased, so that the rotor assembly 83 is difficult to vibrate. Accordingly, the vibration transmitted from the rotor assembly 83 to the stator assembly 65 and the motor frame 35 is reduced. From this point, the vibration of the motor frame 35 is suppressed and the quietness of the refrigerator is further enhanced.
[0055]
Further, the balance of the rotor assembly 83 was corrected based on the fact that the rotor yoke 73 is housed in the mold with the three small-diameter balance holes 76 and the large-diameter balance hole 76 as marks. For this reason, it is not necessary to perform the plus balance method of attaching a weight to the blade plate 82 of the rotor assembly 83 or the minus balance method of cutting the blade plate 82, so that the balance of the rotor assembly 83 is easily corrected.
[0056]
Further, four balance holes 76 are provided at equal intervals in the rotor yoke 73, and the diameter dimension of one balance hole 76 is different from the remaining three balance holes 76. For this reason, since the overall balance of the rotor assembly 83 can be adjusted in units of (360/4) ° with the large balance hole 76 as a mark, the rotor yoke can be used even when the balance of the fan 81 changes due to, for example, renewal of the mold. 73.
[0057]
Further, four balance holes 76 are provided corresponding to the four blades 82 of the fan 81. For this reason, since the balance of the blade plate 82 is individually adjusted based on the adjustment of the opening amount and position of each balance hole 76, the overall balance of the rotor assembly 83 is further increased, and the vibration of the motor frame 35 is further suppressed. It is done.
[0058]
Further, a protrusion 79 that fits into the balance hole 76 of the rotor 73 is formed integrally with the fan 81. For this reason, the fan 81 is prevented from being misaligned with respect to the rotor 73 in the circumferential direction, so that the rotor assembly 83 is maintained in a balanced state, and the vibration of the motor frame 35 is stabilized. It can be suppressed.
[0059]
Further, since the concave portion 74 is provided on the outer peripheral surface of the rotor yoke 73 and the protrusion 78 fitted into the concave portion 74 is integrally formed with the fan 81, the fan 81 is displaced in the axial direction with respect to the rotor yoke 73. Is prevented from slipping out of the rotor yoke 73 due to displacement in the axial direction. In particular, in the case of a refrigerator, the temperature fluctuation range is large, and the difference between the expansion / contraction amount of the mold layer 77 and the fan 81 and the expansion / contraction amount of the rotor yoke 73 is large, so that the protrusion 79 is fitted in the balance hole 76. Therefore, it is effective to prevent the positional deviation in the circumferential direction of the fan 81 and to prevent the positional deviation in the axial direction of the fan 81 based on the fitting of the protrusion 78 in the recess 74. .
[0060]
  In the first embodiment, the gap is formed between the lower end portion of the connector 63 and the wide stay 41. However, the present invention is not limited to this. For example, the second embodiment of the present invention is shown. As in 5, between the twoBulletA U-shaped rubber plate 85 corresponding to a sex member may be interposed. In the case of this configuration, the vibration transmitted from the rotor assembly 83 through the stator assembly 65 and the connector 63 is absorbed by the rubber plate 85, so that the thin lead wire accommodating portion 43 of the motor frame 35 is prevented from vibrating due to the influence of the connector 63. It is done. In addition, moisture such as cold air can be prevented from entering the connector 63 from between the connector 63 and the stay 41 by the rubber plate 85, so that condensation can be prevented from occurring in the connector 63.
[0061]
In the first and second embodiments, the diameter of one balance hole 76 out of the four balance holes 76 is different from that of the remaining three balance holes 76. However, the present invention is not limited to this. Instead, for example, the diameter dimensions of the four balance holes 76 may all be different. Alternatively, the diameter of the two predetermined balance holes 76 may be set to be the same, and the diameter of the remaining two balance holes 76 may be set to a size different from that of the two predetermined balance holes 76.
[0062]
In the first and second embodiments, the rotor yoke 73 is provided with the four balance holes 76 corresponding to the four blade plates 82. However, the present invention is not limited to this. As shown in FIG. 6 showing the third embodiment, one balance hole 76 may be provided on the rotor yoke 73 on the side where the center of gravity of the fan 81 is biased.
[0063]
In the first to third embodiments, the recess 74 is formed on the outer peripheral surface of the rotor yoke 73. However, the present invention is not limited to this, and a protrusion protruding to the outer peripheral side may be formed. In this case, it is preferable to form a recess in the yoke mold layer 77 that engages with the protrusion of the rotor yoke 73 when the yoke mold layer 77 and the fan 81 are formed.
[0064]
In the first to third embodiments, the present invention relates to the R fan device 33 for flowing wind to the R evaporator 28, the F fan device 34 for flowing wind to the F evaporator 30, and the C fan device 84 for flowing wind to the compressor 32. However, the present invention is not limited to this. For example, a fan device that sends cooling air to a magnetron of a microwave oven, a fan device that blows air to a hot air heater of an microwave oven, and generates indoor air. You may apply to the fan apparatus etc. of the ventilation fan exhausted outside.
[0065]
【The invention's effect】
  As is clear from the above description, the fan device of the present invention has the following effects.
  According to the means of claim 1,A balance hole was formed in the rotor yoke. For this reason, since the mechanical balance of the rotor is increased, the vibration of the motor frame is suppressed. Moreover, the balance of the rotor can be easily corrected by simply storing the rotor yoke in the mold with the balance hole as a mark.
  According to the means of claim 2,Since the rotor yoke is provided with a plurality of balance holes at substantially equal intervals and the diameter of at least one balance hole is different from that of the remaining balance holes, the overall balance of the rotor is in units of (360 / number of balance holes) °. Can be adjusted.
[0066]
  According to the means of claim 3,A plurality of balance holes were provided corresponding to the plurality of blades of the fan. For this reason, since the balance of a plurality of blades can be individually adjusted, the overall balance of the rotor is further increased, and the vibration of the motor frame is further suppressed.
  According to the means of claim 4,Since the engaging portion is provided on the outer peripheral surface of the rotor yoke and the engaged portion that engages with the engaging portion of the rotor yoke is integrally formed with the fan, the fan is prevented from being displaced in the axial direction with respect to the rotor yoke.
[0067]
  According to the means of claim 5,Since an elastic member is interposed between the motor frame and the stator, vibration of the motor frame can be suppressed. In addition, since the space between the stator and the motor frame is blocked by the elastic member, moisture or the like is less likely to enter the stator. In addition, since the cylinder portion is provided on the motor frame, water is less likely to enter the stator. In addition to this, the magnetic imbalance of the rotor is reduced, and the vibration transmitted from the rotor to the stator is reduced, so that the vibration of the motor frame is further suppressed. Furthermore, since the elastic member is fitted to the outer peripheral surface of the cylinder portion of the motor frame, the elastic member is prevented from coming off due to vibration or the like.
  According to the means of claim 6,Since the connector is housed in the stay of the motor frame, the fan blowing capacity is increased. In addition, since an elastic member is interposed between the tip of the connector and the stay, the motor frame can be prevented from vibrating due to the influence of the connector, and condensation can be prevented from occurring in the connector.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of the present invention (a is a sectional view showing a fan device, b is an enlarged view of a portion Xb, and c is a sectional view taken along line Xc).
2A and 2B are views showing a motor frame (a is a view taken along line Xa, b is a cross-sectional view taken along line Xb, c is a cross-sectional view taken along line Xc, and d is a cross-sectional view taken along line Xd).
FIG. 3 is a view showing a rotor assembly.
FIG. 4 is a view showing a refrigerator (a is a front view showing the refrigerator with the door removed, and b is a cross-sectional view taken along line Xb).
5A and 5B are diagrams showing a second embodiment of the present invention (a is a cross-sectional view showing a relationship between a connector and a stay, and b is a cross-sectional view taken along line Xb).
6 is a view corresponding to FIG. 3, showing a third embodiment of the present invention.
7 is a view corresponding to FIG. 1 (a) showing a conventional example.
[Explanation of symbols]
  33 is an R fan device (fan device), 34 is an F fan device (fan device), 35 is a motor frame, 36 is a cylinder, 39 is a rubber plate (elastic member), 40 and 41 are stays, 47 is a mounting piece, 48 is a bearing bracket, 54 is a bearing metal (bearing), 58 is a stator core, 60 is a coil, 61 is a terminal block, 63 is a connector, 65 is a stator assembly (stator), 71 is a rotating shaft, 73 is a rotor yoke, and 74 is a recess. (Engagement portion), 76 is a balance hole, 78 is a projection (engaged portion), 79 is a projection, 81 is a fan, 82 is a blade, 83 is a rotor assembly (rotor), 84 is a C fan device ( Fan device), 85 is a rubber plate(BulletSex member).

Claims (6)

A stator having a stator core around which a coil is wound;
A bearing bracket that is fitted to the inner peripheral surface of the stator from both axial sides and holds the bearing;
A motor frame sandwiched between the stator and the one bearing bracket;
A rotor having a rotating shaft rotatably supported by the both bearings;
A fan that rotates together with the rotating shaft,
The rotor has a cylindrical rotor yoke,
The fan is formed of a synthetic resin as a material on the outer peripheral surface of the rotor yoke,
One end face of the rotor yoke is provided with a balance hole for correcting the balance of the rotor and closed with a synthetic resin which is a material for forming the fan. . On one end surface of the rotor yoke, a plurality of balance holes are provided at substantially equal angles in the circumferential direction,
The fan device according to claim 1, wherein at least one balance hole has a diameter different from that of the remaining balance holes . The fan device according to claim 1, wherein a plurality of balance holes are provided on one end surface of the rotor yoke so as to correspond to the plurality of blades of the fan. An engagement portion is provided on the outer peripheral surface of the rotor yoke,
The fan device according to claim 1 , wherein an engaged portion that engages with the engaging portion is integrally formed with the fan. An elastic member interposed between the motor frame and the stator;
A cylindrical portion provided on the motor frame and extending in the axial direction;
The cylindrical portion is interposed between one bearing bracket and the stator,
The fan device according to claim 1 , wherein the elastic member is fitted to an outer peripheral surface of the cylindrical portion . The stator is provided with a terminal block having a connector,
The motor frame is provided with mounting pieces via a plurality of radially arranged stays,
The connector is housed in a predetermined stay among the plurality of stays,
2. The fan device according to claim 1, wherein an elastic member is interposed between the tip of the connector and the predetermined stay .

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