JP3311678B2 - Drum type washing machine - Google Patents

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 (herein, a drum type washing machine) which stores laundry in a drum rotatably arranged about a horizontal axis and performs washing or washing and drying.
A washing machine having a drying function is also referred to as a "washing machine").

[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 while water is stored in the outer tub. Washing and rinsing of the stored laundry is performed.
As a method for 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, the weight balance of the outer tub around the rotation axis of the drum becomes uneven, and the vibration of the outer tub during rotation of the drum tends to increase.

On the other hand, the present applicant has proposed a drum type washing machine of a so-called direct drive system 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 weight for balance. 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]

However, in the direct drive system, the motor is installed on the back of the outer tub. Therefore, if the motor is directly mounted on a drum or an outer tub having a conventional structure, the depth of the washing machine becomes large. Conversely, if the depth of the washing machine is to be kept the same as that of the belt drive system, the depth of the drum must be reduced. Then, there is a problem that the peripheral area of the drum decreases, the opening area of the water passage hole decreases, and the dewatering efficiency decreases. On the other hand, countermeasures such as increasing the number of water passage holes or widening the opening of each water passage hole can be considered. However, when dehydrating, the cloth of the laundry gets into the water passage holes, and it is difficult to take out the laundry. There is a problem that the fabric becomes damaged or the fabric is damaged.

The present invention has been made in view of the above points, and a main object of the present invention is to provide a direct drive type drum type washing machine having a drum structure capable of obtaining high dehydration performance. Is to provide.

[0006]

According to a first aspect of a drum type washing machine according to the present invention was made in order to solve the above-Dora
In a direct drive type drum type washing machine in which a rotating shaft and a motor shaft attached to a rear side end surface of a drum are directly connected, a concave portion is formed in the center of the rear surface of an outer tub in which a drum is mounted, and a motor is mounted in the concave portion. , corresponding to the shape of the concave portion recessed a central drum rear-side end face inwardly, de
It is characterized in that the outer peripheral side of the ram is extended to the rear side .

In a second drum type washing machine according to the present invention, in the first drum type washing machine, the number of water holes or the number of water holes per water hole on the rear side of the drum is larger than the front side. The feature is that the opening area is increased.

A third drum type washing machine according to the present invention is characterized in that, in the second drum type washing machine, the inside diameter of the drum is gradually increased from the front side to the back side.

A fourth drum type washing machine according to the present invention is characterized in that, in the first drum type washing machine, the motor is an outer rotor type DC brushless motor.

In a fifth drum type washing machine according to the present invention, in the fourth drum type washing machine, the blades projecting at predetermined angular intervals on an outer peripheral side of an outer rotor of the motor are provided.
It is characterized by being provided with a predetermined gap from the inner peripheral wall surface of the concave portion of the outer tank.

A sixth drum type washing machine according to the present invention is characterized in that, in the fifth drum type washing machine, a ventilation opening is provided on the back side of the outer rotor.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the above-mentioned first drum type washing machine, the drum and the outer tub each have a substantially cylindrical shape, and are depressed inward at the rear end face corresponding to the motor mounting portion. It has an irregular shape. In other words, the depth of the drum is short around the rotation axis, but is long on the outer peripheral side. For this reason, the side peripheral area is large, and the opening area of the water passage hole can be secured large, so that water is easily scattered from the inside and the dewatering efficiency is high.

Further, in this configuration, since the inner peripheral side of the drum rear surface bulges inward, the laundry easily gathers on the front side of the drum when washing is easy. Therefore, during dehydration following washing and rinsing, a large amount of laundry sticks to the inner surface of the side peripheral wall on the drum front side. In the second drum type washing machine, since the number of water holes or the opening area per water hole is small on the front side of the drum, the laundry cloth stuck in this way is inserted into the water holes. It can be easily removed because it is hard to bite and sticks weakly. In addition, damage to the cloth of the laundry can be reduced. On the other hand, the water spouted from the laundry during dehydration can be scattered to the outer tub side through many water holes on the back side, so that sufficient dehydration performance can be ensured.

Further, in the third drum type washing machine, the water spouted from the laundry at the time of spin-drying flows to the back side of the drum due to the centrifugal force, so that the scattering of water is more reliably ensured, and high spin-drying performance can be obtained. it can.

In the fourth drum type washing machine, an outer rotor type DC brushless motor having a stator on the inner periphery and a rotor on the outer periphery is used as a motor. Can be made larger. Further, since the outer diameter of the rotor can be made larger, a large rotational torque can be obtained. Further, since the heavy object rotates on the circumference that is coaxial and distant from the axis, the vibration of the outer tub can be further suppressed by the action of the moment of inertia.

Further, in the outer rotor type motor, heat radiation is difficult because the stator which is a heat source is located on the inner peripheral side. However, in the fifth drum type washing machine, when the rotor rotates, the rear rotor is operated by the blades. Air is sucked in and the air flow cools the stator. Further, in the sixth drum-type washing machine, a path in which the air sucked from the rear outside by the blades passes through the vicinity of the stator and out to the rear inside from the ventilation opening,
Or air flows in the reverse route. Therefore, cooling of the stator can be performed more smoothly, and overheating of the stator can be prevented.

[0017]

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. FIG. 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 a front opening is suspended and supported by a vibration-proof spring 3 and a damper 4 inside an outer box 1. A door 5 that opens and closes 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 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 the tip end surface of the main shaft 7 with 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 back 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 fixed as described later.
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 portion 15, a magnetic path is formed from the coil 18 to the opposing permanent magnet 13 across the gap, thereby forming an outer rotor. The part 11 rotates. The drum 6 is driven to rotate via the main shaft 7 at the same rotation speed as the outer rotor portion 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 this 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 rear 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 supporting 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 the present embodiment, the drum 6 has such a shape that the inner diameter gradually increases from the front side to the rear 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 surface, the laundry agitated in the drum 6 during washing and rinsing tends to gather on the front side of the drum 6. When the state 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 passage holes 61 is large, not only is it difficult to take out the laundry after the spin-drying is completed, but also the laundry becomes 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 where a large amount of laundry adheres, the laundry is weakly adhered and the laundry can be easily taken out after the spin-drying is completed. .

Further, of the water discharged from the laundry during the spin-drying operation, the water that cannot be scattered toward the outer tub 2 from the water passage hole 61 near the laundry is centrifugal force. As shown by the arrow B, it flows toward the back of the drum 6. Drum 6
Since many water holes 61 are opened on the back side, the flowing water is scattered from the water holes 61 toward the outer tub 2 as shown by arrow C in FIG. That is, the dewatering performance of the water passage hole 61 on the front side of the drum 6 is not impaired at least, 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 made within the spirit 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 a motor portion of the drum-type washing machine according to the embodiment as viewed from the rear side.

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

[Explanation of symbols]

 2 outer tank 6 drum 61 water passage 7 main shaft 8 bearing 9 bearing 10 motor 11 outer rotor part 12 rotor housing 121 rib 122 ventilation opening 13 permanent magnet 15 stator part 16 stator Housing 17 ... Core 18 ... Coil

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsunori Shinmura 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. No. 5 Sanyo Electric Co., Ltd. (72) Inventor Tetsuo Harada 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-9-182369 (JP, A) JP-A-7-265578 (JP, A) JP-A-4-307091 (JP, A) JP-A-58-159889 (JP, U) JP-A-3-123488 (JP, U) (58) Fields investigated Int.Cl. ⁷ , DB name) D06F 1/00-58/28 H02K 29/00

Claims (6)

(57) [Claims] 1. A drum attached to a rear end of a drum.
In a drum type washing machine of a direct drive type in which a rotating shaft and a motor shaft are directly connected, a concave portion is formed in the center of the back of an outer tub that houses a drum, and a motor is mounted in the concave portion. A drum type washing machine characterized in that the center of the drum rear side end surface is depressed inward, and the outer peripheral side of the drum is extended rearward . 2. The drum type washing machine according to claim 1, wherein the number of water holes or the opening area per water hole is larger on the rear side than on the front side of the drum. 3. The drum type washing machine according to claim 2, wherein an inner diameter of the drum is gradually increased from a front side to a back side. 4. The drum type washing machine according to claim 1, wherein said motor is an outer rotor type DC brushless motor. 5. The drum-type drum according to claim 4, wherein blades projecting at predetermined angular intervals on an outer peripheral side of an outer rotor of the motor are provided with a predetermined gap from an inner peripheral wall surface of the concave portion of the outer tub. Washing machine. 6. The drum type washing machine according to claim 5, wherein a ventilation opening is provided on a back side of the outer rotor.