CN101399472A - Drum-type washing machine - Google Patents

Abstract

An object of the present invention is to provide a front-loading washing machine including a drive unit group in which a metal flange serving as a reinforcement can be screwed to the inner diameter side of the stator even when the drive unit group is in the state. The present invention is a drum type washing machine. A driving unit group having a metal flange and a driving motor is provided on the outer tub of the drum washing machine, the outer tub and the driving unit group are sealed with a water seal, and the rotating drum and the driving unit are sealed together. The motor is directly connected to the main shaft, and the above-mentioned metal flange is installed at a position larger than the outer diameter of the driving motor with mounting screws. It is characterized in that a rotor for fixing the metal flange to the outer tub is provided on the rotor. hole.

Description

front load washing machine

technical field

The present invention relates to a drum type washing machine in which a drive unit group that directly drives and fixes a rotating drum is installed on the outer tub of the washing machine, and a metal flange is fixed to the outer tub at a position smaller than the inner diameter of the stator while the rotor is installed. washing machine.

Furthermore, the present invention also includes a washing and drying machine capable of performing washing and drying continuously.

Background technique

A technical solution for directly mounting a motor with an internally rotating rotor on a rotating drum is described in Japanese Patent Application Laid-Open No. 2006-358 (Patent Document 1). Brackets are provided on both sides of the stator, and the outer diameter side of the bracket is provided. Fix it on the outer barrel with screws in the way of clamping with the end bracket.

In drum-type washing and drying machines, the method of directly driving the rotating drum with an electric motor in order to reduce noise has become the mainstream. The rotating drum is placed inside the resin-molded tub and is directly connected to the motor through the rotating shaft. At this time, it is necessary to increase the resin strength and heat resistance of the mounting part to directly install the stator on the outer tub, so a metal flange is placed between the outer tub and serves as reinforcement for the outer tub, and the metal flange is installed with screws. on the outer barrel. The motor is fixed to the metal flange with screws. The greater the imbalance caused by the laundry in the rotary drum, the greater the strength of the metal flange is required. Moreover, the higher the speed of rotation of the rotary drum, the more vibration is transmitted to the outer tub, and there is a problem that the noise becomes higher. It is necessary to screw the metal flange evenly on the outer tub. When it is installed on the outer barrel in the state of the stator, since the rotor exists inside the stator, the metal flange can only be fixed with screws on the outer side of the stator.

Contents of the invention

In view of the above problems, the present invention aims to provide a drum-type motor with a drive unit group that can screw a metal flange that doubles as a reinforcement to the inner diameter side of the stator even in the state of the drive unit group. washing machine.

The feature of the present invention is that when it is installed in the washing machine, it is installed on the outer tub in the state of the drive part group, so in this state, the metal flange is installed on the outer tub with screws, so there is a guarantee for tightening on the rotor side. Rotor with holes for fastening screws.

The present invention has the following effects.

According to the present invention, since the metal flange can be fixed with screws at a position smaller than the outer diameter of the stator without detaching the rotor in the state where the drive unit is fixed to the outer tub, it can be mounted on the inner side without deteriorating operability. Since the flange made of metal is fixed, it is possible to provide a front-loading washing machine in which the reinforcement strength is improved and vibration is hardly transmitted.

Description of drawings

Fig. 1 is a longitudinal sectional view of a drum-type washing and drying machine according to an embodiment of the present invention.

FIG. 2 shows a front view of the rotor 31 according to the embodiment of the present invention.

FIG. 3 shows a longitudinal sectional view of a rotor 31 according to an embodiment of the present invention.

FIG. 4 shows a front view of the drive unit group 40 according to the embodiment of the present invention.

FIG. 5 shows a vertical cross-sectional view of the driving unit group 40 according to the embodiment of the present invention.

FIG. 6 shows a longitudinal sectional view of the driving unit group 40 according to the embodiment of the present invention.

Fig. 7 shows a partial longitudinal sectional view of the outer tub 4 in which the driving unit group is attached according to the embodiment of the present invention.

In the picture:

1-outer frame, 2-base, 3-lid, 4-outer tub, 5-rotating drum, 6-spindle, 7-driving motor, 8-metal flange, 9-washing, 10-dehydration Hole, 11-fluid balancer, 12-bellows, 13-hanger, 14, 15-tension spring, 16-drainage hose, 17-installation leg, 18-water supply hose, 19-water supply solenoid valve, 20 -Water injection hose, 21-detergent tray, 22-flexible hose, 23-lifter, 24-drain valve, 25-air blower fan, 26-dry filter, 27-heater, 28-spray outlet, 29-Dehumidification device, 30-Air duct, 31-Rotor, 32-Rotor hole, 33-Fan blade, 34-Rotor hub, 35-Rotor flange, 36-Rotor core, 37-Permanent magnet, 38-Pole piece , 39-Synthetic resin, 40-Drive group, 41, 43, 52, 53-Installation screw, 44-Installation hole, 45-Hub part, 46-Bearing, 47-Water seal, 48-Flange, 49-Nut , 50-stator, 51-motor cover.

Detailed ways

Hereinafter, examples related to the embodiment of the present invention will be described using the drawings.

Fig. 1 shows a longitudinal sectional view of a drum-type washing and drying machine according to an embodiment of the present invention.

The outer frame case has an outer frame 1 and a base portion 2 on which the outer frame 1 is placed and supported.

In addition, there is a case where the outer frame housing is constituted by only the outer frame 1 without the base portion 2 .

The outer frame 1 has an openable and closable cover 3 provided in the center of the front.

A resin-molded outer tub 4 is arranged inside the outer frame 1 , and a rotatable rotary drum 5 is arranged in the outer tub 4 . The rotating 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 tub 4 . At the time of assembly, the drive part group in which the main shaft 6 and the drive motor 7 are mounted on the metal flange 8 is installed on the outer tub 4, and then the rotating drum is installed. In the case of the present embodiment, the rotating drum driving motor 7 is a DC brushless motor having a magnet-embedded inner rotor and a stator having coils with concentrated windings. A plurality of dehydration holes 10 are provided on the entire inner circumference of the rotary drum 5 to remove moisture contained in the laundry 9 by rotating at a high speed during dehydration.

Rotary drum 5 is provided with fluid balancer 11 for reducing unbalanced vibration caused by laundry 9 during dehydration.

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

In order to reduce the unbalanced vibration caused by the laundry 9, the outer tub 4 is supported by two hangers 13 at the bottom. The hanger 13 is used to support the outer tub 4 and all its accessories to form a firm structure. Furthermore, a damping mechanism and the like are provided for preventing abnormal vibration caused by resonance of the outer tub 4 generated during dehydration operation.

In addition, the upper part of the tub 4 is supported by two tension springs 14 and 15 arranged in front and rear. These tension springs 14, 15 are provided in order to prevent the tub 4 from toppling over in the front-back direction and to reduce vibration in the front-back, up-down, and left-right directions during dehydration. A drain hose 16 for draining washing water is attached to the base portion 2 . Furthermore, mounting legs 17 are provided at the four corners of the base portion 2 . The mounting legs 17 are made of rubber and are used to attenuate vibration during operation of the drum-type washing and drying machine.

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 2 . The mounting legs 17 are formed of rubber to damp vibration during operation of the drum-type washer-dryer.

In addition, the above-mentioned outer frame case has the outer frame 1 and the base portion 2 , but the base portion 2 may not be provided and the mounting legs 17 may be provided on the outer frame 1 . In this case, the outer frame 1 becomes an outer frame chassis.

During washing or rinsing, water required for washing or rinsing is supplied through a water supply hose 18 connected to a water tap, a water injection hose 20 connected to a water supply solenoid valve 19 , and a detergent pan 21 .

The supplied water is collected at the bottom of the tub 4 as washing water, and is also used as rinsing water during rinsing. Detergent necessary for washing is put into the detergent tray 21, and a softener is put in for easy washing at the time of rinsing.

During washing, the water supplied from the water injection hose 20 is injected from the upper part of the outer tub 4 through the flexible hose 22 while dissolving the detergent in the detergent pan 21 .

Laundry 9 thrown in with lid 3 opened is placed in rotary drum 5 arranged laterally to the rotation axis line inside outer tub 4 . A plurality of lifters 23 are provided inside the rotary drum 5 in order to lift up the laundry 9 during washing.

Unnecessary water after washing or rinsing and water detached from laundry 9 during spin-drying are discharged from drain hose 16 by opening drain valve 24 .

The air blown by the blower fan 25 during drying must pass through the drying filter 26 because it contains lint by passing through the inside and the outer periphery of the rotary drum 5 in which the laundry 9 is placed.

Therefore, air is blown to the heater 27 through the dry filter 26, and the heated warm air is sent to the rotary drum 5 from the outlet portion 28 provided on the upper portion of the outer tub.

The warm air is dehumidified through the laundry 9 from the rear of the rotary drum 5 through the vent of the dehumidifier 29 arranged at the bottom of the outer tub 4 , and the laundry 9 is dried by repeated circulation by the blower fan 25 .

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 6 and the size is φ30mm, and they are arranged at positions of φ140mm at equal intervals. Furthermore, fan blades 33 molded from resin are provided between the holes 32 of the rotor.

FIG. 3 shows a longitudinal sectional view of a rotor 31 according to an embodiment of the present invention. The rotor 31 is arranged at a distance from a forged rotor hub 34 and a rotor flange 35, and a rotor core 36 is fitted on the outer periphery of the rotor flange 35, and a permanent magnet 37 and a magnetic pole piece 38 are independently arranged thereon, and a synthetic resin 39 is used. Formed in one piece.

FIG. 4 shows a front view of the drive unit group 40 according to the embodiment of the present invention. The drive motor 7 is fixed to the metal flange 8 at six positions by drive motor mounting screws 41 . Six attachment holes 43 for attachment to the 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 tub 4 is provided at the position of the rotor hole 32 provided in the rotor 31 .

FIG. 5 shows a vertical cross-sectional view of the driving unit group 40 according to the embodiment of the present invention. In the drive unit group 40 , hub parts 45 are formed on both sides of the center part of the metal flange 8 , and the main shaft 6 is freely rotatable via bearings 46 . In order to seal the washing water of the outer tub 4, a water seal 47 is installed on one side of the outer tub. Further, the main shaft 6 is fitted with a flange 48 for mounting the rotary drum 5 on the outer tub side of the main shaft 6 . The rotor 31 fixes the front end of the main shaft 6 with a nut. The stator 50 is mounted on the metal flange 8 with mounting screws 41 .

FIG. 6 shows a front view of the drive unit set mounted on the tub 4. As shown in FIG. A motor cover 51 is attached to the driving motor 7 . For the motor cover 51, a press-worked steel plate is used. Also, the motor cover 51 is attached after the drive unit group 40 is attached to the tub 4 . The metal flange 8 passes through the rotor hole 32 provided in the rotor 31 , and is fixed inside at multiple places with mounting screws 52 . Also, the outer side is fixed at multiple places with mounting screws 52 . The number of mounting screws 52, 53 is 6 in the present embodiment, but it may be 5-8. Therefore, if the number is small, the distance between the mounting screws is too large, which reduces the rigidity of the mounting portion, and if it is too large, the rigidity does not increase and the man-hours of work increase.

FIG. 7 shows a partial vertical cross-sectional view of the drive unit set mounted on the outer tub 4. As shown in FIG. The driving unit group 40 is installed on the inner side of the tub. The hub portion 45 of the metal flange 8 constituting the driving portion group 40 is press-fitted with a water seal 47 inside and covered with rubber on the outside. The outer tub hub portion 54 is press-fitted in this portion to seal the outer tub 4 and the drive unit group 40 to prevent washing water from leaking to the outside. After fixing the metal flange 8 with the mounting screws 53 in this state, align the rotor 31 with a predetermined position, that is, align the position of the mounting hole 44 of the outer tub with the position of the hole 32 of the rotor and fix the metal flange 8 with the mounting screws 52. The inner side of flange 8 is made. At this time, since the permanent magnet 37 is used for the rotor 31, a magnetic attraction force is generated between the rotor 31 and the stator 50, and a cogging torque is generated. If the cogging torque is large, when the mounting screw 52 is manually tightened, the position of the rotor 31 will change due to the cogging torque when the rotor 31 is released, so that it needs to be pressed by hand. Therefore, by using the friction torque of the main shaft 6 to reduce the cogging torque, the rotor 31 can be positioned at a free position using the friction torque.

Also, the mounting screws 52 can be tightened by aligning the positions of the rotor holes 32 and the mounting screws 52 within the range of the stop position of the rotor 31 according to the cogging torque. In this embodiment, the period per one rotation of the cogging torque is reduced in order to make it within the range of the stop position. The number of slots in the stator is 42 and the number of poles in the rotor is 56 poles, so the cogging torque is generated at 168 in one rotation, and the offset caused by the cogging torque is relatively small at an angle of about 2.1 degrees, and the rotor The shape of the hole 32 of the rotor is φ30mm and the diameter of the hole of the rotor is φ140mm, so the offset amount under this diameter is about 2.6mm, which is very small compared with the diameter of the hole 32 of the rotor, so there is no need to use the friction rotation of the main shaft 6. Positioning by torque can also be sufficient to align the rotor bore 32 with the mounting screw 52 position.

The seal between the metal flange 8 and the outer tub 4 is sealed with rubber at the portion of the outer tub hub portion 54 as described above, so the inner side of the outer tub 4 cannot obtain sufficient rigidity for axial vibrations. Correspond with the strength of the outer tub 4. However, the front and rear, that is, both sides of the main shaft 6 cannot be constrained, and only the side in contact with the metal flange 8 is constrained.

In addition, according to the increase of the capacity of the laundry, the outer dimensions of the rotary drum 5 become larger, and the rotation speed during the dehydration rotation is also changed from 800 revolutions per minute to thousands of hundreds of revolutions. Barrel 4 strength needed.

The outer barrel 4 is molded with synthetic resin, so to increase the mechanical strength, it is necessary to greatly increase the amount of materials used. In particular, the smaller the diameter of the mounting portion of the metal flange 8 is, the more the strength of the outer tub 4 needs to be increased by using more materials to increase the strength of the mounting portion.

In order to solve the above-mentioned problems, the present invention sets the position of the mounting hole 43 as far as possible on the outside when the metal flange is installed on the outer tub 4 and also sets the installation part on the inside, so that the outer tub 4 and the metal flange 8 are installed together. The screws 52 are integrally mounted to increase the rigidity and increase the mechanical strength.

The inner mounting part can also be on the outer side of the stator 50, but the effect becomes smaller due to the position far away from the hub part 45, so it is better to be fixed between the hub part 45 and the stator 50 as much as possible.

The reason for this is that the hub portion 45 of the metal flange 8 is sealed with rubber in a state of being fitted into the outer tub 4, so that it is in a state of almost no mechanical coupling. Therefore, the vibration caused by the unbalance of the rotating drum 5 is transmitted to the mounting part of the outer tub 4 through the main shaft 6. If the area of the inside of the mounting part is larger than that of the outside, that is, the mounting part, surface vibration is likely to occur in the inner part of the outer tub 4. So the noise increases.

In addition, the part where a large load caused by the imbalance of the rotating drum 5 is applied is the mounting part of the metal flange 8 and the outer tub 4, so by distributing the stress of the mounting part to both the outside and the inside, the installation can be reduced. strength of the department. Thus, by making the plate thickness of the metal flange 8 thicker on the inside and thinner on the outside, it is possible to reduce the amount of material used compared to a metal flange having the same thickness.

In the rotor 31, the inner diameter side is joined to the inner diameter of the rotor flange 35 by resin molding with a small-diameter part by using a forged rotor hub 45 with high strength, and the magnetic pole pieces 38 and permanent magnets are formed on the outer peripheral portion of the rotor flange 35. The magnet 37 uses Nd rare earth magnets and overlaps the rotor core 36 having a small height, so that the height of this part can be reduced and the rotor hole 32 of the rotor flange 35 can be provided sufficiently large.

Claims (5)

1. A drum-type washing machine, on the outer tub of the drum-type washing machine, a drive unit group with a metal flange and a drive motor is installed, the outer tub and the drive unit group are sealed with a water seal, and the rotating drum and the drive motor are sealed. It is directly connected with the main shaft, and the above-mentioned metal flange is installed at a position larger than the outer diameter of the driving motor with mounting screws, and it is characterized in that, A hole for fixing the metal flange to the outer tub is provided on the rotor. 2. The drum type washing machine according to claim 1, characterized in that, The cogging torque is reduced in one rotation cycle, and at the equilibrium position according to the cogging torque, the position of the mounting screw (52) is prevented from disengaging from the position of the hole (32) of the rotor. 3. The drum type washing machine according to claim 1, characterized in that, Use the friction torque of the main shaft to reduce the cogging torque. 4. The drum type washing machine according to claim 1, characterized in that, The amount of deflection of the rotor due to cogging torque is made smaller than the diameter of the rotor hole, and the rotor hole is aligned with the position of the mounting screw. 5. The drum type washing machine according to any one of claims 1 to 3, characterized in that: The number of holes in the rotor is 5-8.

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