JP2009072493A - Drum type washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drum type washing machine provided with a drive sub-assembly in which a metallic flange serving also as a reinforcement can be screw-fixed on the inner diameter side of a stator even when the flange is incorporated in the drive sub-assembly. <P>SOLUTION: In the drum type washing machine, the outer tub of the drum type washing machine is provided with the drive sub-assembly provided with the metallic flange and a driving motor, the outer tub and the drive sub-assembly is sealed by water sealing, a rotary drum and the driving motor are directly connected by a main shaft, and the metallic flange is attached by an attaching screw at a position larger than the outer diameter of the driving motor. A rotor is provided with a hole of the rotor for fixing the metallic flange to the outer tub. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a washing machine in which a drive unit set for directly driving a rotating drum is attached and fixed to an outer tub of a washing machine, and a metal flange is fixed to the outer tub with the rotor attached at a position smaller than the inner diameter of the stator. The present invention relates to a drum-type washing machine that can be used.

  The present invention also includes a washing and drying machine that can be executed from washing to drying.

  Japanese Laid-Open Patent Publication No. 2006-358 (Patent Document 1) is a motor in which a motor provided with an internal rotation type rotor is directly attached to a rotary drum, and includes both end brackets sandwiching a stator, It is fixed to the outer tub with screws so that the diameter side is sandwiched between end brackets.

JP 2006-358 A

  In drum-type washing and drying machines, a system in which a rotating drum is directly driven by an electric motor has become the mainstream in order to reduce noise. A rotating drum is disposed inside an outer tub formed of resin, and is directly connected to an electric motor via a rotating shaft. At this time, in order to attach the stator directly to the outer tub, it is necessary to increase the resin strength and heat resistance strength of the mounting part, so a metal flange is placed between the outer tub and the metal reinforced to reinforce the outer tub. The flange is attached to the outer tub with screws. The electric motor is fixed to the metal flange with a screw. The greater the unbalance due to the laundry in the rotating drum, the stronger the strength of the metal flange. In addition, there is a problem that vibration is transmitted to the outer tub and the noise increases as the rotating drum rotates at a high speed, and it is necessary to fix the metal flange to the outer tub evenly with screws, but the drive unit in which the electric motor is incorporated When assembled in the outer tub in the assembled state, the metal flange could be fixed with screws only at the outer position of the stator because there was a rotor inside the stator.

  In view of the above-described problems, the present invention includes a drive unit set that can fix a metal flange with a screw on the inner diameter side of the stator even when the metal flange also serves as a drive unit set. An object is to provide a drum-type washing machine.

  Since the present invention is assembled in the state of the drive unit set in the outer tub when incorporating the washing machine, a metal flange is attached to the outer tub with a screw in that state, so a hole for tightening the screw on the rotor side is secured. It is characterized by having a rotor.

  According to the present invention, the metal flange can be fixed with a screw at a position smaller than the outer diameter of the stator without removing the rotor in a state where the drive unit set is fixed to the outer tub, so that workability is not deteriorated. Since a metal flange can be fixed on the inner side, a drum type washing machine having high reinforcement strength and hardly transmitting vibration can be provided.

  Hereinafter, examples according to embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 relates to an embodiment of the present invention, and shows a longitudinal sectional view of a drum type washing and drying machine.

  The outer frame housing includes an outer frame 1 and a base portion 2 that supports the outer frame 1 so as to be placed thereon.

  In addition, there is a case in which an outer frame housing is configured only by the outer frame 1 without the base portion 2.

  The outer frame 1 has a lid 3 that can be opened and closed provided in the center of the front.

  An outer tub 4 made of resin is disposed inside the outer frame 1, and a rotatable rotating drum 5 is disposed in the outer tub 4. The rotary drum 5 is directly connected to the drive motor 7 via the main shaft 6. The drive motor 7 is fixed to a metal flange 8, and the metal flange 8 is fixed to the outer tub 4. At the time of assembly, the rotary drum 5 is assembled after the drive unit assembly in which the main shaft 6 and the drive motor 7 are assembled to the metal flange 8 is assembled to the outer tub 4. In this embodiment, the rotary drum driving motor 7 is a magnet-embedded inner rotor and the stator is a DC brushless motor having concentrated windings. A plurality of dewatering holes 10 for dewatering moisture contained in the laundry 9 at high speed during dehydration are provided inside the rotating drum 5.

  The rotating drum 5 is provided with a fluid balancer 11 for reducing unbalance vibration due to the laundry 9 during dehydration.

  In order to seal the washing water between the lid 3 and the outer tub 4, a bellows 12 made of a rubber elastic body is provided.

  The outer tub 4 is supported by two suspensions 13 at the bottom to reduce unbalanced vibration caused by the laundry 9. The suspension 13 supports the outer tub 4 and the total weight attached thereto, and has a strong structure. In addition, a damping mechanism or the like is provided to prevent abnormal vibration caused by resonance of the outer tub 4 that occurs during the dehydration operation.

  Further, the upper part of the outer tub 4 is supported by two tension springs 14 and 15 arranged at the front and rear. These tension springs 14 and 15 are provided to support vibrations that prevent the outer tub 4 from collapsing in the front-rear direction and to reduce vibrations in the front-rear, up-down, and left-right directions during dehydration.

  A drain hose 16 for draining washing water is attached to the base portion 2. In addition, mounting legs 17 are provided at the four corners of the base portion 1. The mounting legs 17 are made of rubber and dampen vibration during operation of the drum type washing and drying machine.

  Although the outer frame housing has the outer frame 1 and the base portion 2, it is possible to provide the mounting legs 17 on the outer frame 1 without providing the base portion 2. In this case, the outer frame 1 becomes an outer frame casing.

  At the time of washing and rinsing, water necessary for washing and rinsing is supplied via a water supply hose 18 connected to a water faucet, a water injection hose 20 connected to a water supply electromagnetic valve 19, and a detergent tray 21.

  The supplied water is stored as washing water at the bottom of the outer tub 4 and as rinsing water at the time of rinsing. The detergent tray 21 is loaded with a detergent necessary for washing, and a rinse finish is poured to improve the finish when rinsing.

  At the time of washing, water supplied from the water injection hose 20 is poured from the upper part of the outer tub 4 through the flexible hose 22 while dissolving the detergent in the detergent tray 21.

  The rotating drum 5 inside the outer tub 4 with the rotational axis centering on the side is opened with the lid 3 placed therein, and the laundry 9 is placed inside. A plurality of lifters 23 are provided inside the rotary drum 5 so that the laundry 9 can be lifted up during washing.

  Water that has become unnecessary after washing and rinsing and water that has been dehydrated from the laundry 9 during dehydration are drained from the drain hose 16 by opening the drain valve 24.

  At the time of drying, the air blown by the blower fan 25 passes through the inside and the outer periphery of the rotating drum 5 containing the laundry 9 and contains lint. Therefore, the air must be passed through the drying filter 26.

  For this reason, it blows to the heater 27 via the drying filter 26, and the heated warm air is blown into the rotary drum 5 from the jet port portion 28 provided in the upper part of the outer tub.

  The hot air passes through the laundry 9 and is dehumidified from the rear portion of the rotating drum 5 through the ventilation port 30 of the dehumidifying device 29 provided at the bottom of the outer tub 4 and is repeatedly circulated by the blower fan 25 to dry the laundry 9. .

  FIG. 2 shows a front view of the rotor 31 according to the embodiment of the present invention. A plurality of rotor holes 32 are provided on the upper surface of the rotor 31. In this embodiment, the number is six, the size is φ30 mm, and they are provided at equal intervals at positions of φ140 mm. A fan blade 33 formed of resin is provided between the holes 32 of the rotor.

  FIG. 3 relates to an embodiment of the present invention, and shows a longitudinal sectional view of the rotor 31. In the rotor 31, a rotor boss 34 formed by forging and a rotor flange 35 are arranged with a gap, and a rotor core 36 is fitted on the outer periphery of the rotor flange 35, and a permanent magnet 37 is independently provided on the rotor core 36. And the magnetic pole piece 38 are arranged and formed by integral molding with the synthetic resin 39.

  FIG. 4 relates to the embodiment of the present invention, and shows a front view of the drive unit set 40. The driving motor 7 is fixed to the metal flange 8 by driving motor mounting screws 41 at six locations. Six attachment holes 43 for attaching to the outer tub 4 are provided on the outer diameter side of the metal flange 8. An attachment hole 44 for attaching the metal flange 8 to the outer tub 4 is provided at the position of the rotor hole 32 provided in the rotor 31.

  FIG. 5 relates to an embodiment of the present invention, and shows a longitudinal sectional view of the drive unit set 40. The drive unit set 40 has bosses 45 formed on both sides of the central portion of the metal flange 8, and the main shaft 6 is rotatable by a bearing 46. In order to seal the washing water in the outer tub 4, a water seal 47 is attached to the outer tub side. A flange 48 for attaching the rotating drum 5 is fitted to the main shaft 6 on the outer tank side of the main shaft 6. The rotor 31 has the tip of the main shaft 6 fixed with a nut. The stator 50 is attached to the metal flange 8 with an attachment screw 41.

  FIG. 6 shows a front view in which the drive unit set is attached to the outer tub 4. A motor cover 51 is attached to the drive motor 7. The motor cover 51 is made by pressing a steel plate. The motor cover 51 is attached after the drive unit set 40 is attached to the outer tub 4. The metal flange 8 is fixed at a plurality of locations on the inside by mounting screws 52 through a rotor hole 32 provided in the rotor 31. Similarly, the outside is fixed by a plurality of mounting screws 53. In the present embodiment, the number of mounting screws 52 and 53 is six, but may be five to eight. If the number is smaller than this, the distance between the mounting screws becomes too large and the rigidity in the mounting portion becomes small. If the number is too large, the rigidity does not increase, but the number of work steps increases.

  FIG. 7 shows a partial longitudinal sectional view in which the drive unit set is attached to the outer tub 4. The drive unit set 40 is attached to the back side of the outer tub. The boss portion 45 of the metal flange 8 constituting the drive unit set 40 is press-fitted with a water seal 47 on the inner side and covered with rubber on the outer side. The outer tank boss part 54 is press-fitted into this part, and the outer tank 4 and the drive unit set 40 are sealed so that the washing water does not leak outside. In this state, after the outside of the metal flange 8 is fixed by the mounting screw 53, the rotor 31 is fixed at a predetermined position, that is, the position of the mounting hole 44 of the outer tub and the position of the rotor hole 32. Thus, the inside of the metal flange 8 is fixed. At this time, since the permanent magnet 37 is used for the rotor 31, a magnetic attractive force is generated between the rotor 31 and the stator 50, and a cogging torque is generated. If this cogging torque is large, when the mounting screw 52 is manually tightened, the position changes depending on the cogging torque when the restriction of the rotor 31 is released. For this reason, by making the cogging torque smaller than the friction torque of the main shaft 6, the rotor 31 can be positioned at a free position by the friction torque.

  Further, the mounting screw 52 can be tightened by matching the positions of the rotor hole 32 and the mounting screw 52 within the range of the stop position of the rotor 31 due to the cogging torque. In this embodiment, in order to make it within the range of the stop position, the period of one rotation of the cogging torque is reduced. Since the number of slots in the stator is 42 and the number of poles in the rotor is 56, cogging torque is generated at 168 per revolution, and the displacement due to the cogging torque is as small as about 2.1 degrees in angle. Since the outer diameter of the rotor 32 is 30 mm and the diameter of the rotor hole is 140 mm, the amount of deviation in this diameter is about 2.6 mm, which is sufficiently smaller than the diameter of the rotor hole 32 so that positioning with the friction torque of the spindle 6 is not required. However, the positions of the rotor holes 32 and the mounting screws 52 can be made to coincide with each other.

  As described above, the seal between the metal flange 8 and the outer tub 4 is sealed with rubber at the portion of the outer tub boss 54, so that the inner side of the outer tub 4 can obtain sufficient rigidity against vibration in the axial direction. It was not possible to cope with this problem by increasing the strength of both the metal flange 8 and the outer tub 4. However, the front and rear of the main shaft 6, that is, both sides cannot be restricted, and only one side in contact with the metal flange 8 is provided.

  Further, as the outer volume of the rotating drum 5 increases due to an increase in the capacity of the laundry and the rotation speed during the spin-drying rotation increases from 800 rotations per minute to several hundred rotations, the drive unit set 40 and the outer tub 4 There is a need to increase the strength significantly.

  Since the outer tub 4 is formed of a synthetic resin, it is necessary to greatly increase the amount of material used to increase the mechanical strength. In particular, in order to increase the strength of the outer tub 4 in order to increase the strength of the mounting portion as the diameter of the mounting position of the metal flange 8 is smaller, it is necessary to increase the material used.

  In order to solve the above-described problems, the present invention makes the position of the mounting hole 43 as far as possible outside when attaching the metal flange 8 to the outer tub 4, and also provides an attachment portion on the inner side so that the outer tub 4 and the metal The flange 8 was integrally attached with the mounting screw 52 to increase the rigidity, thereby increasing the mechanical strength.

  The inner mounting portion may be on the outer side of the stator 50, but the effect is reduced because it is far away from the position of the boss portion 45. Therefore, the inner mounting portion is preferably fixed between the boss portion 45 and the stator 50 as much as possible.

  This is because the boss portion 45 of the metal flange 8 is fitted into the outer tub 4 and sealed with rubber, so that it is not mechanically coupled. For this reason, the vibration due to the unbalance of the rotating drum 5 is transmitted to the mounting portion of the outer tub 4 through the main shaft 6, and if the mounting portion has a larger area outside, that is, the inner side than the mounting portion, surface vibration occurs in the inner portion of the outer tub 4. As it becomes easy, noise increases.

  In addition, since the portion to which a large load due to the unbalance of the rotating drum 5 is applied is the attachment portion of the metal flange 8 and the outer tub 4, the strength of the attachment portion is reduced by distributing the stress of the attachment portion to both the outside and the inside. is doing. This makes it possible to reduce the amount of material used compared to the metal flange 8 that is thicker on the inside and thinner on the outside than the uniform thickness.

  In the rotor 31, a forged rotor boss 45 having a high strength is used on the inner diameter side so that the inner diameter of the rotor flange 35 is coupled to the inner diameter of the rotor flange 35 by resin molding. Since the Nd rare earth magnet is used for the permanent magnet 37 and the rotor core 36 having a small height is overlapped, the height of this portion can be reduced, and the rotor hole 32 of the rotor flange 35 can be formed. It can be provided sufficiently large.

1 is a longitudinal sectional view of a drum type washing and drying machine according to an embodiment of the present invention. The front view of the rotor 31 which concerns on the Example of this invention is shown. The longitudinal cross-sectional view of the rotor 31 is based on the Example of this invention. The front view of the drive unit set 40 according to the embodiment of the present invention is shown. The longitudinal cross-sectional view of the drive part group 40 which concerns on the Example of this invention is shown. The longitudinal cross-sectional view of the drive part group 40 which concerns on the Example of this invention is shown. The partial longitudinal cross-sectional view which concerns on the Example of this invention and the drive part group is attached to the outer tank 4 is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer frame 2 Base part 3 Lid 4 Outer tub 5 Rotating drum 6 Main shaft 7 Driving motor 8 Metal flange 9 Laundry 10 Dewatering hole 11 Fluid balancer 12 Bellows 13 Suspension 14, 15 Pull spring 16 Drain hose 17 Mounting leg 18 Water supply hose 19 Water supply solenoid valve 20 Water supply hose 21 Detergent tray 22 Flexible hose 23 Lifter 24 Drain valve 25 Blower fan 26 Drying filter 27 Heater 28 Spout 29 Dehumidifier 30 Ventilation path 31 Rotor 32 Rotor hole 33 Fan blade 34 Rotor boss 35 Rotor flange 36 Rotor core 37 Permanent magnet 38 Magnetic pole piece 39 Synthetic resin 40 Drive unit set 41, 43, 52, 53 Mounting screw 44 Mounting hole 45 Boss portion 46 Bearing 47 Water seal 48 Flange 49 Nut 50 Stator 51 Motor 51 cover

Claims (5)

  A drive unit set having a metal flange and a drive motor is attached to the outer tub of the drum-type washing machine, the outer tub and the drive unit set are sealed with a water seal, and the rotating drum and the drive motor are directly connected by the main shaft. In the drum type washing machine in which the mounting flange is mounted with a mounting screw at a position larger than the outer diameter of the driving motor, the rotor is provided with a rotor hole for fixing the metal flange to the outer tub. A drum-type washing machine.   2. The drum type washing machine according to claim 1, wherein the period of one rotation of the coking torque is reduced so that the position of the mounting screw 52 does not deviate from the position of the hole 32 of the rotor at the balance position by the cogging torque. Drum-type washing machine featuring.   2. The drum type washing machine according to claim 1, wherein the cogging torque is made smaller than the friction torque of the main shaft.   2. The drum type washing machine according to claim 1, wherein a period of cogging torque of the rotor is made smaller than a diameter of the hole of the rotor, and the position of the hole of the rotor and the position of the mounting screw are matched. Machine.   The drum type washing machine according to any one of claims 1 to 3, wherein the number of holes in the rotor is 5 to 8.

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