JP2000283099A - Fan device - Google Patents

Abstract

(57) [Abstract] [Problem] To suppress vibration of a motor frame. A motor frame is provided between a coil mold layer and a bearing bracket via a rubber plate.
Is pinched. For this reason, vibration is less likely to be transmitted from the rotor assembly 83 to the motor frame 35 through the stator assembly 65, so that the vibration of the motor frame 35 is suppressed. In addition, the balance of the rotor yoke 73 is intentionally broken based on the formation of the balance hole 76 in the rotor yoke 73, and the imbalance in the molding of the fan 81 is offset by the intentional imbalance of the rotor yoke 73. The overall balance of the assembly 83 is increased. Therefore, the rotor assembly 83 is less likely to vibrate,
The vibration of the motor frame 35 is further suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fan device having a structure in which a motor frame is sandwiched between a stator and a bearing bracket.

[0002]

FIG. 7 shows Japanese Patent Application No. Hei 10-1.
1 illustrates a fan device described in US Pat. 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 provided on the inner peripheral surface of the stator 1 from both sides in the axial direction. Mated. A bearing metal 6 is held in these two bearing brackets 5, and a rotating shaft 8 of a rotor 7 is rotatably supported on the two bearing metals 6.

The rotor 7 has a cylindrical rotor yoke 9 having one end closed and a plurality of rotor magnets 10 fixed to the inner peripheral surface of the rotor yoke 9. The surface of the rotor yoke 9 is made of a synthetic resin yoke. It is covered by the mold layer 11. The yoke mold layer 11 is formed by injecting molten resin in a state where the rotor yoke 9 is housed in a mold (insert molding), and the yoke mold layer 11 is integrally formed with a fan 12. I have.

In the case of the above configuration, one of the bearing brackets 5
The motor frame 13 is sandwiched between the motor frame 13 and the coil mold layer 4 of the stator 1, and the motor frame 13 is fixed to the product. For this reason, vibrations and the like due to the imbalance of the fan 12 are transmitted from the rotor 7 to the motor frame 13 through the stator 1, and the motor frame 13 may be vibrated. 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.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fan device capable of suppressing vibration of a motor frame.

[0006]

According to a first aspect of the present invention, there is provided a fan device having a stator having a stator core on which a coil is wound, and a bearing bracket which is fitted to an inner peripheral surface of the stator from both sides in the axial direction to hold the bearing. A motor frame sandwiched between the stator and the one bearing bracket, a rotor having a rotating shaft rotatably supported by the bearings, and a fan rotating with the rotating shaft. It is characterized in that an elastic member is interposed between the stator and the stator. According to the above means, the vibration transmitted from the rotor through the stator is absorbed by the elastic member. For this reason, since it is difficult for the vibration to be transmitted from the stator to the motor frame, the vibration of the motor frame is suppressed. In addition, since the space between the stator and the motor frame is closed by the elastic member, it is difficult for moisture or the like to enter the inside of the stator through the space between the stator and the motor frame.

A fan device according to a second aspect is characterized in that a cylindrical portion extending in the axial direction is provided on the motor frame, and the cylindrical portion is interposed between one bearing bracket and the stator. I have. According to the above-described means, since the space between the stator and the bearing bracket is axially closed by the cylindrical portion of the motor frame, it becomes more difficult for moisture and the like to enter the inside of the stator through the space therebetween.

The fan device according to the third aspect is characterized in that the elastic member is fitted on the outer peripheral surface of the cylindrical portion. According to the above means, the elastic member is prevented from coming off due to vibration or the like.

According to a fourth aspect of the present invention, in the fan device, a terminal block having a connector is provided on the stator, and a mounting piece is provided on the motor frame via a plurality of radially arranged stays.
It is characterized in that the connector is housed in a predetermined stay among the plurality of stays, and a gap is formed between a tip portion of the connector and the predetermined stay. According to the above means, the connector is housed in the predetermined stay of the motor frame. For this reason, the connector is prevented from becoming the air blowing resistance of the fan, and the air blowing capacity of the fan is increased. In addition, a gap is formed between the distal end of the connector and the predetermined stay. For this reason, it is difficult for the vibration to be transmitted from the rotor to the predetermined stay through the stator and the connector, so that the motor frame is suppressed from vibrating under the influence of the connector.

According to a fifth aspect of the present invention, in the fan device, a terminal block having a connector is provided on the stator, and a mounting piece is provided on the motor frame via a plurality of radially arranged stays.
It is characterized in that the connector is housed in a predetermined stay among the plurality of stays, and another elastic member is interposed between a tip portion of the connector and the predetermined stay. According to the above means, since the connector is accommodated in the predetermined stay of the motor frame, the blowing capacity of the fan is enhanced. Moreover, another elastic member is interposed between the distal end portion of the connector and the predetermined stay. Therefore, the vibration transmitted from the rotor through the stator and the connector is absorbed by another elastic member, so that the motor frame is prevented from vibrating under the influence of the connector.

According to a sixth aspect of the present invention, there is provided a fan device having a stator having a stator core on which a coil is wound, a bearing bracket fitted on an inner peripheral surface of the stator from both sides in the axial direction to hold a bearing, the stator and the stator. A motor frame sandwiched between one bearing bracket, a rotor having a rotating shaft rotatably supported by the two bearings, and a fan rotating with the rotating shaft, wherein the rotor has a cylindrical rotor yoke. The fan is characterized in that a synthetic resin is formed on the outer peripheral surface of the rotor yoke and a balance hole for correcting the balance of the rotor is provided on one end surface of the rotor yoke.
According to the above means, the balance of the rotor yoke is intentionally broken based on the formation of the balance holes, and the overall balance of the rotor is enhanced based on the cancellation of the imbalance in the molding of the fan by the intentional imbalance of the rotor yoke. be able to. For this reason, since the vibration of the rotor is suppressed, the vibration transmitted from the rotor to the stator and the motor frame is reduced, and the vibration of the motor frame is suppressed.

In the fan device according to the present invention, a plurality of balance holes are provided at one end surface of the rotor yoke at substantially equal angles in a circumferential direction, and the diameter of at least one balance hole is different from the remaining balance holes. It has features wherever it is.
According to the above means, the overall balance of the rotor can be adjusted in units of (360 / number of balance holes) °.

An eighth aspect of the present invention is characterized in that a plurality of balance holes are provided on one end surface of the rotor yoke corresponding to the plurality of blade plates of the fan.
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.

According to a ninth aspect of the present invention, the fan device is characterized in that the fan is integrally formed with a protrusion fitted into the balance hole of the rotor yoke. According to the above-described means, it is possible to prevent the fan from being displaced in the circumferential direction with respect to the rotor yoke, thereby preventing imbalance. Therefore, the rotor is kept in a balanced state, and the vibration of the motor frame is stably suppressed.

A fan device according to a tenth aspect is characterized in that an engaging portion is provided on an outer peripheral surface of a rotor yoke, and an engaged portion that engages with the engaging portion is formed integrally with the fan. ing. According to the above means, the fan is prevented from being displaced in the axial direction with respect to the rotor yoke.

[0016]

FIG. 1 shows a first embodiment of the present invention.
A description will be given with reference to FIG. First, in (a) of FIG. 4, the refrigerator main body 21 is in the shape of a rectangular box having a front opening. A chamber 26 is defined.

On the rear wall of the refrigerator main body 21, FIG.
As shown in FIG. 2, an R cool air generation chamber 27 is formed behind the vegetable room 23, and an R evaporator 28 of a refrigeration cycle is disposed in the R cool air generation chamber 27. Further, on the rear wall of the refrigerator main body 21, an F cold air generation chamber 29 is formed behind the select room 24, the ice making room 25, and the freezing room 26. An F evaporator 30 for the cycle is provided.

A machine room 31 is formed on the rear wall of the refrigerator body 21 at the lowest position, and a compressor 32 of a refrigeration cycle is provided in the machine room 31 as shown in FIG. It is arranged. An R evaporator 28 and an F evaporator 30 are connected to a discharge port of the compressor 32, and a refrigerant is supplied from the compressor 32 to the R evaporator 28 and the F evaporator 30.

As shown in FIG. 4B, an R fan device 33 is provided in the R cool air generation chamber 27. The R fan device 33 draws air through the R evaporator 28. Then, cool air is generated and blown into the vegetable room 23 and the refrigerator room 22. Further, an F fan device 34 is provided in the F cold 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 sucking air through the F evaporator 30 to generate the cool air inside the select room 24 and the ice making room 25.
And the inside of the freezing room 26 is blown.

FIGS. 1 to 3 show the mechanical structure of the R fan device 33 and the F fan device 34. FIG. Hereinafter, the 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 a synthetic resin into a cylindrical shape. As shown in FIG.
Are 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.

An annular concave portion 38 is formed on the rear surface of the motor frame 35 at an outer peripheral portion of the cylindrical portion 36.
As shown in FIG. 1B, an annular rubber plate 39 corresponding to an elastic member is fitted in the recess 38. The inner diameter of the rubber plate 39 is set smaller than the outer diameter of the cylindrical portion 36 in a state where the rubber plate 39 is not fitted to the outer peripheral surface of the cylindrical portion 36. Closely adhered.

As shown in FIG. 2A, three narrow stays 40 and one wide stay 41 are radially arranged on the outer peripheral surface of the motor frame 35. As shown in FIG. As shown in FIGS. 2 (b) and 2 (c), the latter wide stay 41 has a U-shaped connector storage section 42 having an open rear surface, and FIGS. 2 (b) and 2 (d). As shown in FIG. 2, a lead wire storage section 43 having a U-shaped cross section having an open front surface is provided at the upper end of the lead wire storage section 43.
As shown in (a) and (b), a concave portion 44 whose upper surface is open is formed.

An annular stay frame 4 is provided at the tip of three narrow stays 40 and at the tip of one wide stay 41.
The bell mouth 46 is formed integrally with the stay frame 45 as shown in FIG. As shown in FIG. 2A, three attachment pieces 47 are integrally formed on the stay frame 45, and the motor frame 35 fixes each of the attachment pieces 47 to the wall surface of the refrigerator body 11. Is attached to the refrigerator main body 11 based on.

As shown in FIG. 1A, a bearing bracket 48 is attached to the motor frame 35.
The bearing bracket 48 is formed by drawing a metal plate into a substantially T-shape, and is pressed into the inner peripheral surface of the rib 37 of the cylindrical portion 36 as shown in FIG. And is fixed to the motor frame 35.

As shown in FIG. 1A, a metal cover 49 is fitted on the inner peripheral surface of the bearing bracket 48, and the front opening of the bearing bracket 48 is closed by the cover 49. ing. A projecting spring mounting portion 50 is integrally formed on the cover 49, and a thrust plate 51 made of synthetic resin is fixed to the spring mounting portion 50.

A front end of a pressing spring 52 is fitted on the outer peripheral surface of the spring mounting portion 50. The presser spring 52 is made of a compression coil spring.
A metal presser 53 is attached to the rear end of the second holder 2. A bearing metal 54 is accommodated in the bearing bracket 48, and the metal presser 53 engages with the outer peripheral surface of the bearing metal 54 by the spring force of the presser spring 52, as shown in FIG. The bearing metal 54 is pressed against the inner peripheral surface of the bearing bracket 48.

In the bearing bracket 48, FIG.
As shown in the figure, an annular felt 55 is provided, and a cylindrical felt 56 is provided in the cover 49.
These felts 55 and 56 are impregnated with a lubricating oil, and the bearing metal 54 is lubricated by the lubricating oil oozing out of the felts 55 and 56. Reference numeral 57 denotes a bearing bracket 48, a cover 49, a thrust plate 51, a presser spring 52, a metal presser 53, a bearing metal 54, and a felt 55.
FIG. 5 shows a front bearing assembly having a and 56. FIG.

At the rear end of the bearing bracket 48 of the front bearing assembly 57, the inner peripheral surface of the stator core 58 located at the outer peripheral surface is press-fitted. 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. The insulating layer 59 is formed by injecting a molten resin while the stator core 58 is housed in a molding die (not shown).
The U-phase coil 60 and the V-phase coil 6 from above the insulating layer 59.
The 0, W phase coil 60 is wound.

A plurality of pin terminals (not shown) extending forward are fixed to the front surface of the insulating layer 59.
The 0-W phase coil 60 is electrically connected to the pin terminals based on winding the terminal portion around the pin terminals. 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 the W-phase coil 60 are electrically connected to the terminal plate 62 based on soldering pin terminals to the terminal plate 62. ing.

A box-shaped connector 63 having an open lower surface is integrally formed on the terminal block 61. The connector 63 is housed in the connector housing 42 of the wide stay 41, and the rear opening of the connector housing 42 is closed. I'm blocking. The lower end of the connector 63 is inserted into the concave portion 44 of the wide stay 41, and the space between the lower end of the connector 63 and the inner surface of the concave portion 44 is as shown in FIGS. , A gap is formed.

As shown in FIG. 1A, a coil mold layer 64 made of a synthetic resin is formed on the stator core 58. The coil mold layer 64 is formed of the stator core 5
8 shows a U-phase coil 60 to a W-phase coil 60 and a terminal block 61.
After the stator core 58 is housed in a molding die (not shown) and molten resin is injected, the U-phase coils 60 to W
The entire surface of the phase coil 60, the entire surface of the terminal block 61 excluding the connector 63, the soldered portion between each pin terminal and the terminal plate 62, and the like are covered with the coil mold layer 64.

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, as shown in FIG. It is sandwiched between the motor frame 35 and the coil mold layer 64. Reference numeral 65 in FIG. 1A indicates a stator assembly corresponding to a stator. The stator assembly 65 includes a stator core 58, an insulating layer 59, U-phase coils 60 to W-phase coils 60, a terminal block 61, and a connector. 6
3. It has a coil mold layer 64 and the like.

As shown in FIG. 1A, a pair of connectors 66 is fitted to the connector 63,
Are connected to terminals (not shown) of a pair of connectors 66.
It is connected to the. 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 43 of the wide stay 41. The lead wire housing 43 is covered with a cover (not shown) made of synthetic resin, and the front opening of the lead wire housing 43 is closed by the cover.

An inverter circuit (not shown) is connected to the lead wires 67 of the pair of connectors 66. A commercial AC power supply (not shown) is connected to this inverter circuit via a rectifier circuit (not shown).
The phase coil 60 generates a rotating magnetic field based on DC power supplied from the rectifier circuit through the inverter circuit, the lead wire 67, the terminal plate 62, and the pin terminal.

As shown in FIG. 1 (a), an annular synthetic resin collar 68 is press-fitted on the inner peripheral surface of the stator core 58, and a plurality of projections 69 are provided on the front surface of the collar 68. Are integrally formed. 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, felts 55 and 56.
The front end of the bearing bracket 48 of the rear bearing assembly 70 is press-fit into the inner peripheral surface of the stator core 58 from the rear, and the plurality of protrusions 69 of the collar 68 are sandwiched between the two bearing brackets 48. .

The front end and the rear end of the rotating shaft 71 are rotatably supported in the bearing metal 54 of the front bearing assembly 57 and the bearing metal 54 of the rear bearing assembly 70. The rotating shaft 71 is pressed against the thrust plate 51 of the front bearing assembly 57, and the rear end of the rotating shaft 71 penetrates the cover 49 of the rear bearing assembly 70 and projects rearward. The rotary shaft 71 has a small-diameter portion 72 formed therein.
8 so as to be rotatable.

A rotor yoke 73 is provided at the rear end of the rotating shaft 71.
Has been fixed. The rotor yoke 73 is formed by drawing a steel plate into a cylindrical shape having a closed rear surface, and has an annular concave portion 74 formed on the outer peripheral surface of the rotor yoke 73 so as to open toward the outer peripheral side. A plurality of rotor magnets 75 are fixed to the inner peripheral surface of the rotor yoke 73 at equal intervals in the circumferential direction.
The 0-W phase coil 60 rotates around the rotating shaft 71 based on generating a rotating magnetic field. Note that the concave portion 74 corresponds to an engaging portion.

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, as shown in FIG. These four balance holes 76 are equally spaced in the circumferential direction (9
(0 °), the balance and the direction of the rotor yoke 73 with respect to the rotating shaft 71 are intentionally lost in quantity and direction by three small-diameter balance holes 76 and one large-diameter balance hole 76.

As shown in FIG. 1A, a yoke mold layer 7 made of synthetic resin is formed on the surface of the rotor yoke 73.
7 is formed, and at the rear end of the yoke mold layer 77, an annular protrusion 78 protruding inward is integrally formed. The projection 78 corresponds to the engaged portion,
The rotor yoke 73 is fitted in the recess 74. Also,
On the rear surface of the yoke mold layer 77, three small-diameter projections 79 (only one projection is shown) and one large-diameter projection 79 are integrally formed. The portion 79 fits into the small-diameter balance hole 76 of the rotor yoke 73,
The large protrusion 79 is fitted in the large balance hole 76.

As shown in FIG. 3, a cylindrical fan wall 80 is formed integrally with the yoke mold layer 77.
An axial flow fan 81 is formed integrally with the fan wall 80, and the fan 81 blows air based on rotation integrally with the rotor yoke 73. The fan 81 has four blades 82 lined up at equal pitches (90 °) in the circumferential direction. Three predetermined blades 82 are fitted to three small-diameter balance holes 76 of the rotor yoke 73. And the other one of the blades 82 has a large diameter balance hole 7.
6 in the radial direction.

Reference numeral 83 in FIG. 1A indicates a rotor assembly corresponding to the 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.

The yoke mold layer 77, the fan 81 and the like are formed by injecting a molten resin while the rotor yoke 73 is housed in a molding die (not shown). Imbalance occurs due to the orientation of the gate, the position of the gate, the flow state of the molten resin, and the like. For example, when molding the fan 81 in the direction of FIG. 3, the position of the center of gravity of the fan 81 is deviated downward.

The balance hole 76 of the rotor yoke 73 may be housed in a molding die such that the large diameter balance hole 76 faces downward when the center of gravity of the fan 81 during molding is deviated downward. This serves as a mark when the rotor yoke 73 is positioned in the circumferential direction in the molding die. The imbalance of the fan 81 at the time of molding is offset by the intentional imbalance of the rotor yoke 73, and the rotor assembly 83 is balanced as a whole. Has been raised. The R fan device 33 and the F fan device 34 are configured as described above.

Next, the procedure for assembling the R fan unit 33 and the F fan unit 34 will be described. A rubber plate 39 is provided on the outer peripheral surface of the cylindrical portion 36 of the motor frame 35.
Into the recess 38 of the motor frame 35.
9 is fitted. 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.

The bearing bracket 48 of the front bearing assembly 57 is pressed 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 3 is placed between the coil mold layer 64 and the motor frame 35.
9 is sandwiched, and the gap between the coil mold layer 64 and the motor frame 35 is closed by the rubber plate 39. A collar 68 is pressed into the inner peripheral surface of the stator core 58 of the stator assembly 65 from behind.

The bearing bracket 48 of the rear bearing assembly 70 is pressed 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. The front end of the rotating shaft 71 of the rotor assembly 83 is connected to the rear bearing assembly 7.
No. 0 is inserted into the bearing metal 54 of the front bearing assembly 57 from within the bearing metal 54. At this time, the front end of the rotating shaft 71 presses the collar 68, and the collar 68 is elastically deformed. The front end 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.
7, the stator assembly 65 and the rear bearing assembly 70 are assembled.

In the machine room 31, as shown in FIG. 4A, a C fan device 84 is provided. The C fan device 84 generates cooling air for the compressor 32, and includes the motor frame 35 and the coil mold layer 6
It has the same configuration as the above-described R fan device 33 and F fan device 34 except that no rubber plate 39 is interposed between the four.

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 applied to the rubber plate 39. Is absorbed by For this reason, it is difficult for the vibration to be transmitted from the stator assembly 65 to the motor frame 35, so that the vibration of the motor frame 35 is suppressed. Therefore, it is possible to prevent the wall surface of the refrigerator main body 11 from vibrating and generate a vibration sound, and thus the silence of the refrigerator is improved.

Since the rubber plate 39 is interposed between the motor frame 35 and the coil mold layer 64, the rubber plate 39 is provided between the motor frame 35 and the coil mold layer 64.
Is closed by. This makes it difficult for moisture such as cold air to enter the stator assembly 65 through the space between the coil mold layer 64 and the motor frame 35.
The occurrence of dew condensation in the interior is prevented.

Since the cylindrical portion 36 is provided on the motor frame 35, the rotating shaft 71 is positioned at the axis of the stator core 58 via the bearing metal 54, the bearing bracket 48, and the cylindrical portion 36. Therefore, the radial gap between the rotor magnet 75 and the stator core 58 becomes uniform,
Since the magnitude of the cogging torque becomes uniform and the minimum value becomes smaller, the magnetic imbalance is reduced. Therefore, 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.

Further, since the cylindrical portion 36 is provided on the motor frame 35, the space between the coil mold layer 64 of the stator assembly 65 and the front bearing bracket 48 is closed in the axial direction by the cylindrical portion 36. Therefore, the coil mold layer 64
It is more difficult for moisture such as cold air to enter the stator assembly 65 through the space between the bearing bracket 48 and the front bearing bracket 48, so that dew condensation is less likely to occur in the stator assembly 65.

Further, since the rubber plate 39 is fitted on the outer peripheral surface of the cylindrical portion 36 of the motor frame 35, the rubber plate 39 is prevented from coming off due to vibration or the like. Moreover, the stator assembly 65
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, thereby improving the workability of assembling the rubber plate 39. I do.

The connector 63 is connected to the motor frame 35
In a wide stay 41. For this reason, the connector 63 is prevented from becoming the blowing resistance of the fan 81, and the blowing capacity of the fan 81 is increased. In addition, a gap is formed between the lower end of the connector 63 and the wide stay 41. This makes it difficult for the 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.
Of these, the vibration of the particularly thin lead wire housing 43 due to the influence of the connector 63 is suppressed.

The balance of the rotor yoke 73 with respect to the rotating shaft 71 is intentionally broken based on the formation of three small-diameter balance holes 76 and one large-diameter balance hole 76 in the rotor yoke 73. For this reason, the fan 81
The imbalance in the molding of the rotor assembly 83 is canceled by the intentional imbalance of the rotor yoke 73, and the overall balance of the rotor assembly 83 is increased, so that the rotor assembly 83 is less likely to vibrate. Therefore, the vibration transmitted from the rotor assembly 83 to the stator assembly 65 and the motor frame 35 is reduced.
Also from this point, the vibration of the motor frame 35 is suppressed, and the quietness of the refrigerator is further enhanced.

Further, the balance of the rotor assembly 83 is modified based on the fact that the rotor yoke 73 is housed in a molding die with three small-diameter balance holes 76 and one large-diameter balance hole 76 as marks. Therefore, it is not necessary to perform the plus balance method of attaching weight to the blade plate 82 of the rotor assembly 83 or the minus balance method of shaving the blade plate 82, so that the balance of the rotor assembly 83 can be easily corrected.

Also, four balance holes 76 are provided at equal intervals in the rotor yoke 73, and the diameter of one balance hole 76 is made different from the remaining three balance holes 76. For this reason,
The overall balance of the rotor assembly 83 is adjusted by using a large balance hole 76.
Can be adjusted in units of (360/4) °, so that the rotor yoke 73 can cope with a change in the balance of the fan 81 based on, for example, a renewal of the molding die.

Further, four balance holes 76 are provided corresponding to the four blades 82 of the fan 81. Therefore, the balance of the blade plates 82 is individually adjusted based on the adjustment of the opening amount and position of each balance hole 76, so that the overall balance of the rotor assembly 83 is further increased, and the vibration of the motor frame 35 is further suppressed. Can be

Further, a projection 79 fitted into the balance hole 76 of the rotark 73 is formed integrally with the fan 81. This prevents the fan 81 from being displaced in the circumferential direction with respect to the rotor ark 73 and imbalance, so that the rotor assembly 83 is maintained in a balanced state, and the vibration of the motor frame 35 is stably maintained. Can be suppressed.

Further, the recess 7 is formed on the outer peripheral surface of the rotor yoke 73.
4 and a projection 78 fitted into the recess 74 in the fan 81.
Are integrally formed, the fan 81 is prevented from being displaced in the axial direction with respect to the rotor yoke 73, and the fan 81 is prevented from being displaced in the axial direction and coming out of the rotor yoke 73. Especially in the case of refrigerators, the range of temperature fluctuation is large,
Since the difference between the amount of expansion and contraction of the mold layer 77 and the fan 81 and the amount of expansion and contraction of the rotor yoke 73 is large, the circumferential displacement of the fan 81 based on the fitting of the projection 79 into the balance hole 76. It is effective to prevent the displacement of the fan 81 in the axial direction based on the fact that the projection 78 is fitted into the recess 74.

In the first embodiment, a gap is formed between the lower end 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 may be modified. 5, a U-shaped rubber plate 85 corresponding to another elastic member may be interposed between the two. In 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 housing 43 of the motor frame 35 is prevented from vibrating under the influence of the connector 63. Can be Moreover, since the rubber plate 85 prevents moisture such as cold air from entering the connector 63 from between the connector 63 and the stay 41, dew condensation in the connector 63 is prevented.

In the first and second embodiments, one of the four balance holes 76 is provided.
Is different from the remaining three balance holes 76, but the present invention is not limited to this. For example, the diameters of all four balance holes 76 may be different. Alternatively, the diameters of the two predetermined balance holes 76 are set to be the same, and the diameters of the remaining two balance holes 76 are set to the predetermined two.
The size may be set to be different from the size of the balance holes 76.

In the first and second embodiments, the rotor yoke 73 has four blades 82 corresponding to the four blades 82.
Although the balance holes 76 are provided, the present invention is not limited to this. For example, as shown in FIG. 6 showing a third embodiment of the present invention, one balance hole 76 A balance hole 76 may be provided.

In the first to third embodiments, the concave portion 74 is formed on the outer peripheral surface of the rotor yoke 73. However, the present invention is not limited to this. good. In this case, the yoke mold layer 7
It is preferable to form a recess in the yoke mold layer 77 which engages with the protrusion of the rotor yoke 73 when the fan 7 and the fan 81 are formed.

In the first to third embodiments, the present invention relates to an R fan device 33 for flowing air to an R evaporator 28 and an F fan device 3 for flowing air to an F evaporator 30.
4, the present invention is applied to the C fan device 84 for flowing air to the compressor 32, but the present invention is not limited to this. The present invention may be applied to a fan device that generates warm air, a fan device of a ventilation fan that exhausts indoor air to the outside, and the like.

[0065]

As is apparent from the above description, the fan device of the present invention has the following effects. According to the first aspect, since the elastic member is interposed between the motor frame and the stator, the vibration of the motor frame is suppressed.
In addition, since the space between the stator and the motor frame is closed by the elastic member, it is difficult for moisture or the like to enter the stator. According to the second aspect of the present invention, since the cylindrical portion is provided on the motor frame, it becomes more difficult for water to enter the stator. In addition, particularly 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.

According to the third aspect of the present invention, since the elastic member is fitted to the outer peripheral surface of the cylindrical portion of the motor frame, the elastic member is prevented from coming off due to vibration or the like. According to the fourth aspect of the present invention, since the connector is housed in the stay of the motor frame, the blowing capacity of the fan is enhanced. Moreover, since a gap was formed between the tip of the connector and the stay,
Vibration of the motor frame due to the influence of the connector is suppressed.

According to the fifth aspect of the present invention, since the connector is housed in the stay of the motor frame, the blowing capacity of the fan is enhanced. In addition, since another elastic member is interposed between the distal end portion of the connector and the stay, vibration of the motor frame due to the influence of the connector is suppressed, and dew condensation is prevented from occurring in the connector. According to the sixth aspect, the balance hole is formed in the rotor yoke.
For this reason, the mechanical balance of the rotor is increased, so that the vibration of the motor frame is suppressed. Moreover, the balance of the rotor can be easily corrected simply by housing the rotor yoke in the mold with the balance hole as a mark.

According to the seventh aspect of the present invention, a plurality of balance holes are provided in the rotor yoke at substantially equal intervals, and at least one balance hole is provided.
Since the diameter of each balance hole is made different from the remaining balance holes, the overall balance of the rotor can be adjusted in units of (360 / number of balance holes) °. According to the means of claim 8, a plurality of balance holes are provided corresponding to the plurality of blades of the fan. Therefore, the balance of the plurality of blades can be individually adjusted, so that the overall balance of the rotor is further increased, and the vibration of the motor frame is further suppressed.

According to the ninth aspect of the present invention, the protrusion fitted into the balance hole of the rotor yoke is formed integrally with the fan. Therefore, the fan is prevented from being displaced in the circumferential direction with respect to the rotor yoke and being out of balance, so that the vibration of the motor frame is stably suppressed. Claim 10
According to the means described above, 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 formed integrally with the fan. Is prevented.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention (a is a cross-sectional view showing a fan device, b is a view showing an Xb portion enlarged, and c is an Xc
Sectional view along the line)

FIG. 2 is a view showing a motor frame (a is a view along Xa, b is a sectional view along line Xb, c is a sectional view along line Xc, d is X
Sectional view along line d)

FIG. 3 shows a rotor assembly.

FIG. 4 is a view showing a refrigerator (a is a front view showing the refrigerator with a door removed, and b is a cross-sectional view taken along line Xb).

FIG. 5 is a view 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).

FIG. 6 is a view corresponding to FIG. 3, showing a third embodiment of the present invention.

FIG. 7 shows a conventional example and is equivalent to FIG.

[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, 7
4 is a concave portion (engaging portion), 76 is a balance hole, 78 is a projection (engaged portion), 79 is a projection, 81 is a fan, 82 is a blade plate, 83 is a rotor assembly (rotor), and 84 is C A fan device (fan device) 85 indicates a rubber plate (another elastic member).

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02K 7/14 H02K 7/14 A F term (reference) 3H032 CA06 CA08 3H034 AA02 AA13 AA18 BB02 BB08 CC03 CC05 DD01 DD24 DD28 DD30 EE06 EE10 5H605 AA04 AA05 BB05 BB19 CC01 CC02 CC10 DD05 DD07 DD09 DD11 DD21 5H607 AA04 BB01 BB14 BB17 CC05 EE39 FF04 FF12 GG09 JJ07 JJ08

Claims (10)

[Claims] A stator having a stator core on which a coil is wound; a bearing bracket fitted on an inner peripheral surface of the stator from both sides in the axial direction to hold a bearing; and a stator between the stator and the one bearing bracket. A motor frame, a rotor having a rotating shaft rotatably supported by the bearings, and a fan rotating with the rotating shaft; an elastic member is provided between the motor frame and the stator. A fan device characterized by being interposed. 2. The fan according to claim 1, wherein the motor frame is provided with a tubular portion extending in the axial direction, and the tubular portion is interposed between one of the bearing brackets and the stator. apparatus. 3. The fan device according to claim 2, wherein the elastic member is fitted on an outer peripheral surface of the cylindrical portion. 4. A terminal block having a connector is provided on the stator, and a mounting piece is provided on the motor frame via a plurality of stays arranged radially, and the connector is provided with a predetermined one of the plurality of stays. It is housed in a stay, and between the tip of the connector and the predetermined stay,
The fan device according to claim 1, wherein a gap is formed. 5. A terminal block having a connector is provided on the stator, and a mounting piece is provided on the motor frame via a plurality of radially arranged stays. The connector is provided with a predetermined one of the plurality of stays. It is housed in a stay, and between the tip of the connector and the predetermined stay,
The fan device according to claim 1, wherein another elastic member is interposed. 6. A stator having a stator core on which a coil is wound, a bearing bracket fitted to the inner peripheral surface of the stator from both sides in the axial direction, and holding a bearing; and between the stator and the one bearing bracket. A rotor having a rotating shaft rotatably supported by the bearings; a fan rotating with the rotating shaft; the rotor having a cylindrical rotor yoke; A fan formed of a synthetic resin on an outer peripheral surface of the rotor yoke, and a balance hole for correcting a balance of the rotor is provided on one end surface of the rotor yoke. 7. A plurality of balance holes are provided at one end surface of the rotor yoke at substantially equal angles in the circumferential direction, and at least one balance hole has a diameter different from that of the remaining balance holes. The fan device according to claim 6, wherein 8. The fan device according to claim 6, wherein a plurality of balance holes are provided on one end surface of the rotor yoke corresponding to the plurality of blade plates of the fan. 9. The fan device according to claim 6, wherein the fan is integrally formed with a protrusion fitted into a balance hole of the rotor yoke. 10. The rotor according to claim 6, wherein an engaging portion is provided on an outer peripheral surface of the rotor yoke, and an engaged portion to be engaged with the engaging portion is formed integrally with the fan. Fan device.