JP2002153695A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type washing machine having a direct drive system and capable of preventing overheating of the stator. SOLUTION: Vanelike ribs 121 protruding to the outside at a predetermined angle interval are radially formed on the outer peripheral side of the bent part of the rotor housing 12, and a ventilation opening 122 is provided at an adequate position in a rear surface part of the rotor housing 12. When an outer rotor part 11 rotates in a predetermined direction, air is sucked from a rear surface side by the ribs 121 as shown by the arrow mark A in Fig. 2, passes through a clearance between a permanent magnet 13 and a core 17 and between adjacent cores 17 (to say strictly, a coil support part of a stator housing 16), and escapes to the rear surface side through the ventilation opening 122. This air stream deprives a coil 18 of heat to radiate heat effectively even at a comparatively low rotation speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type washing machine in which laundry is stored in a drum for washing or washing and drying (herein, a washing machine having both drying functions is also called a "washing machine"). To).

[0002]

2. Description of the Related Art In a drum type washing machine, a basket-shaped drum rotated around a horizontal axis is disposed in an outer tub, and the drum is rotated in a state where water is stored in the outer tub. Washing and rinsing of the stored laundry is performed.
As a method of rotating the main shaft of the drum, a motor is mounted on the lower surface of the outer tub, and a pulley fixed to the motor shaft and a pulley mounted on the main shaft of the drum are connected using a V-belt or the like. Things are common. However, in this structure, the weight of the motor lowers the center of gravity of the rear portion of the outer tub, and the weight balance of the outer tub around the rotation axis of the drum becomes uneven, and the outer tub tends to vibrate during rotation of the drum.

On the other hand, the applicant of the present application has filed Japanese Patent Application No. 9-24 / 1990.
No. 270 proposes a so-called direct drive type drum type washing machine in which a motor shaft of a motor mounted on the back of an outer tub is directly connected to a main shaft of a drum. In this washing machine, since the outer tub has a substantially uniform weight distribution around the rotation axis, the center of gravity of the outer tub can be brought closer to the rotation center of the drum without using a balance weight, As a result, there is an advantage that vibration of the outer tank during rotation of the drum can be suppressed and the weight can be reduced.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a drum type washing machine of a direct drive type which can prevent the stator from overheating.

[0005]

A first drum type washing machine according to the present invention comprises an outer tub having an open front surface, a drum disposed in the outer tub and having an open front surface, an outer rotor portion and a stator. And an outer rotor type motor for rotating the drum.The outer rotor portion has blade-like ribs formed radially, and a ventilation opening is perforated in a rear portion of the outer rotor portion. When the outer rotor rotates, air is sucked in by the ribs, and heat is taken from the coils of the stator by air flow.

A second drum type washing machine according to the present invention comprises a drum rotated about a horizontal axis, an outer tub containing the drum, an outer rotor portion and a stator portion. An outer rotor type motor that is driven to rotate, a blade-like rib is radially formed on the outer rotor portion, and a ventilation opening is perforated on a back surface of the outer rotor portion, and when the outer rotor portion rotates, Air is sucked in by the ribs, and heat is taken from the coils of the stator section by an air flow.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the outer rotor type motor, it is difficult to dissipate heat because the stator, which is a heat source, is located on the inner peripheral side. However, in the first and second drum type washing machines, When the outer rotor rotates, air is sucked by the action of the blades, and the airflow cools the stator. Therefore, overheating of the stator can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drum type washing machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side sectional view showing the entire structure of a drum type washing machine according to the present embodiment, FIG. 2 is a side sectional view showing a detailed structure of a motor portion of the drum type washing machine, and FIG. It is the top view seen from. 2 shows only the upper half of the rotation axis, and FIG. 3 shows only the quarter of the rotation direction.

As shown in FIG. 1, in this drum type washing machine, a substantially cylindrical outer tub 2 having an open front is suspended and supported by a vibration-proof spring 3 and a damper 4 inside an outer box 1. A door 5 for opening and closing the front opening of the outer tub 2 is provided on the front surface. Similarly, a drum 6 having a front opening is disposed in the outer tub 2.
Are mounted so as to rotate together. On the other hand, a bearing 8 whose center is formed in a cylindrical shape is fixed to the rear end surface of the outer tub 2, and a bearing 9 provided inside the cylinder is provided.
The main shaft 7 is rotatably supported via the. The center of the rear end surface of the outer tub 2 and the bearing 8 are recessed inward (in the left side in FIG. 1) in a substantially cylindrical shape to form a concave portion, and the DC brushless motor 1 having an outer rotor flat structure is formed in the concave portion.
0 is attached. Also, the rear end surface of the drum 6 is depressed inward corresponding to the shape of the outer tub 2.

As shown in FIG. 2, the motor 10 comprises an outer rotor section 11 and a stator section 15. The outer rotor portion 11 is a resin-made rotor housing 1 having a substantially disk shape whose peripheral edge is bent forward along the axial direction.
2 and a permanent magnet 13 attached to the inner peripheral surface of the bent portion of the rotor housing 12. The permanent magnet 13 has a structure in which a plurality of N poles and S poles are alternately arranged along the inner peripheral surface of the bent portion of the rotor housing 12, and can be attached by various methods such as insert molding. The rotor housing 12 is screwed to a tip end surface of the main shaft 7 by a screw 14, and both rotate integrally. Further, as shown in FIG.
On the outer peripheral side of the bent portion, vane-shaped ribs 121 projecting outward at predetermined angular intervals are formed radially, and a ventilation opening 122 is provided at an appropriate position on the rear surface of the rotor housing 12.
Are perforated. The rib 121 is formed in an oblique and slightly curved shape with respect to the rotation axis.

On the other hand, the stator portion 15 is made of a resin material or the like and radially protrudes to the outer peripheral side to form a plurality of hollow coil support portions. The stator portion 15 is fitted into the coil support portion of the stator housing 16. A core 17;
And a coil 18 wound around the outside of the coil support. The stator housing 16 is fixed to the bearing 8 by screws 19, and the outer rotor portion 11 is
When the rotor rotates, it is guaranteed that a predetermined gap is maintained between the outermost end of the core 17 and the permanent magnet 13 facing the outermost end.

In the above configuration, when a drive current is supplied from a control circuit (not shown) to the coil 18 of the stator section 15, a magnetic path is formed from the coil 18 to the opposing permanent magnet 13 across the gap, thereby forming the outer rotor. The part 11 rotates. Then, the drum 6 is driven to rotate via the main shaft 7 at the same rotation speed as the outer rotor unit 11.

The rotation speed of the drum 6 is about several hundred to 1,000 rpm during the dewatering process, whereas the rotation speed of the drum 6 is about several tens of rpm at the most during rinsing.
In the drum type washing machine of the present embodiment, even at such a low rotation speed, the heat generated in the coil 18 is efficiently dissipated. That is, when the outer rotor portion 11 rotates in a predetermined direction, air is sucked in from the back side by the rib 121 as shown by an arrow A in FIG. 2, and the gap between the permanent magnet 13 and the core 17 and the adjacent core 17 (strictly, It passes between the coil support portions of the stator housing 16 and passes through the ventilation opening 122 to the rear side. Since heat is removed from the coil 18 by such an airflow, heat can be effectively dissipated even at a relatively low rotation speed. When the outer rotor portion 11 is rotated in the opposite direction, the air flow flows in the direction opposite to the arrow A in FIG. 2, but the heat generated by the coil 18 is also effectively dissipated at this time. .

Further, in the drum type washing machine of this embodiment, the drum 6 has a shape whose inner diameter gradually increases from the front side to the back side as shown in FIG. Has a large slope for easy understanding, but in practice a slight slope is sufficient). Further, the drum 6 has a small number of water holes 61 (low density) on the front side and a large number (high density) of water holes 61 on the rear side. The following operation is produced by such a structure of the drum 6.

As described above, since the drum 6 is depressed inward at the rear end face, the laundry stirred in the drum 6 during washing and rinsing tends to gather on the front side of the drum 6. When the operation shifts to the spin-drying operation from such a state, most of the laundry rotates together with the drum 6 while being stuck to the inner peripheral wall surface on the front side of the drum 6 as shown in FIG. Since a large centrifugal force acts on the laundry, the cloth of the laundry hardly enters the water holes 61. For this reason, if the number of the water holes 61 is large, not only is it difficult to take out the laundry after the dehydration is completed, but also the laundry is damaged. However, in the drum-type washing machine of the present embodiment, since there are few water holes 61 on the front side of the drum 6 on which a large amount of laundry adheres, the adhesion of the laundry is weak, and the laundry can be easily taken out after the completion of dehydration. .

Further, of the water discharged from the laundry during the spin-drying operation, the water that cannot be scattered to the outer tub 2 side from the water passage hole 61 near the laundry is centrifugal force. As shown by arrow B, it flows toward the back of the drum 6. Drum 6
Since there are many water holes 61 on the back side, the flowing water is scattered from the water holes 61 to the outer tub 2 as shown by arrow C in FIG. That is, at least the dewatering performance of the water holes 61 on the front side of the drum 6 is not impaired, and dehydration can be efficiently performed using the wide side peripheral surface.

The above embodiment is merely an example, and it is apparent that changes and modifications can be appropriately made within the scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view showing the entire configuration of a drum type washing machine according to one embodiment of the present invention.

FIG. 2 is a side sectional view showing a detailed structure of a motor portion of the drum type washing machine of the embodiment.

FIG. 3 is a plan view of the motor portion of the drum type washing machine according to the present embodiment as viewed from the rear side.

FIG. 4 is a schematic diagram of a drum of the drum-type washing machine according to the present embodiment.

[Description of Signs] 2 ... Outer tank 6 ... Drum 61 ... Water hole 7 ... Main shaft 8 ... Bearing 9 ... Bearing 10 ... Motor 11 ... Outer rotor unit 12 ... Rotor housing 121 ... Rib 122 ... Ventilation opening 13 ... Permanent magnet 15 ... Stator part 16: Stator housing 17: Core 18: Coil

Continued on the front page (72) Inventor Kawamura Kaname ▲ Zou ▼ 2-5-1-5 Keihanhondori, Moriguchi-shi, Osaka Inside Sanyo Electric Co., Ltd. (72) Inventor Mitsunori Shinmura 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Seyo Sugo 2-5-5 Sanyo Electric Co., Ltd., Moriguchi City, Osaka (72) Inventor Tetsuo Harada Keihanhondori, Moriguchi City, Osaka 2-5-5 Sanyo Electric Co., Ltd. F-term (reference) 3B155 AA16 BA12 CA02 CB07 CB49 HB09 MA01 MA02 MA08 5H609 BB18 PP02 PP06 PP07 PP08 PP09 QQ02 QQ13 QQ23 RR06 RR07 RR27 RR35 RR43 RR44 RR69 RR71

Claims (2)

[Claims] An outer tub having an open front surface, a drum disposed in the outer tub and having an open front surface, an outer rotor portion and a stator portion, and an outer rotor type motor for rotating and driving the drum. A blade-shaped rib is radially formed on the outer rotor portion, and a ventilation opening is formed in a rear surface portion of the outer rotor portion. When the outer rotor portion rotates, air is sucked by the rib, and air is sucked. A drum type washing machine wherein heat is taken from a coil of the stator portion by a flow. 2. An outer rotor section comprising: a drum rotated about a horizontal axis; an outer tank in which the drum is mounted; an outer rotor section and a stator section; and an outer rotor type motor for driving the drum to rotate. A blade-shaped rib is formed radially, and a ventilation opening is perforated in the back surface of the outer rotor portion. When the outer rotor portion rotates, air is sucked by the rib, and the stator is moved by airflow. A drum-type washing machine that removes heat from the coil of the section.