JP3567097B2 - Drum type washing machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drum type washing machine in which a rotary tub is driven to rotate by a motor directly connected to the rotary tub.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a drum type washing machine, a water tub is elastically supported inside an outer box, and a rotary tub is rotatably arranged inside the water tub in a horizontal axis state. In general, a motor is provided outside and below the water tank, and the rotational power of the motor is transmitted to the rotary tank by a belt transmission mechanism so that the rotary tank is driven to rotate.
[0003]
However, in this case, a belt transmission mechanism is required to transmit the rotational power of the motor to the rotary tub, resulting in an increase in cost. In addition, the belt transmission mechanism is liable to generate vibrations in individual parts such as pulleys and belts.Furthermore, the belts may slip during high-speed rotation, resulting in a large vibration and noise during operation. Had.
[0004]
In addition, maintenance such as inspection, repair, and replacement of the motor provided at the outer lower part of the water tank was difficult. In addition, in a situation where the washing machine is installed on the waterproof pan and used, when the drain port of the waterproof pan is clogged and the water level of the drain increases, the motor may be flooded or splashed. For this purpose, measures such as an abnormal water level detection device and an electric safety device are required, and the cost is further increased.
On the other hand, in recent years, as shown in FIG. 6, it has been considered that the motor 2 is directly connected to the rotary tub 3 and the rotary tub 3 is rotationally driven with this structure.
[0005]
According to this, since the rotational power of the motor 2 is directly transmitted to the rotary tank 3, a belt transmission mechanism unlike the conventional one is not required. Therefore, the drive device can be simplified accordingly, and cost reduction can be achieved. In addition, since individual vibrations due to parts of the belt transmission mechanism are not generated, and furthermore, the belt is not slipped at the time of high-speed rotation, it is possible to achieve a reduction in operation vibration and noise. .
[0006]
In addition, in this case, since the motor 2 is provided on the back of the water tank 1, maintenance such as inspection, repair, and replacement of the motor 2 can be performed from the back of the outer box 4, thereby facilitating maintenance. . Further, in a situation where the washing machine is installed on the waterproof pan and the drainage port of the waterproof pan is clogged and the water level of the drain increases, the motor 2 is not flooded and the water is splashed. Therefore, measures such as the above-mentioned abnormal water level detecting device and electric safety device for flooding and the like can be made unnecessary, and the cost can be further reduced.
[0007]
[Problems to be solved by the invention]
However, in the case of the above, the motor 2 is positioned protruding from the back of the water tank 1, and the motor 2 protruding from the water tank 1 is in contact with the back of the water tank 1 in order to avoid collision with the back of the outer box 4 during operation. A space having a large dimension A including the size of the motor 2 (the front and rear axial dimensions) must be secured between the outer box 4 and the back of the outer box 1. It gets bigger.
[0008]
The present invention has been made in view of the above circumstances, and therefore has as its object to avoid collision of a motor with an outer box, mainly in the case where a motor for directly rotating a rotary tank is provided at the back of a water tank. An object of the present invention is to provide a drum-type washing machine capable of reducing the depth of the outer box while ensuring the dimensions.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a drum type washing machine of the present invention is provided with a water tub elastically supported inside an outer box and a rotatable inside the water tub substantially in a horizontal axis state. a rotating tub was provided in the end plate portion of the tub, the directly coupled to the rotary tank; and a motor for rotationally driving the rotating tub, a recess in the end plate portion of the tub, during operation When the water tank vibrates, at least a part of the motor is positioned inside the concave portion by a dimension such that a counterpart member that comes into contact with the outer box becomes something other than the motor .
[0010]
According to this, the motor can be positioned forward by at least a portion of the motor located in the concave portion at the back of the water tank, and the outer box is secured while ensuring a dimension to avoid collision of the motor with the outer box. Can be reduced.
[0012]
Also, in operation, when the water tank vibrates, only the dimensions mating member in contact with the outer box is something other than a motor, at least a part of the motor is located within the recess, in operation, aquarium When vibrating, something other than the motor will come into contact before the motor contacts the outer case, thereby more reliably preventing the motor from hitting the outer case.
[0014]
In addition, the outer box may be formed vents in the motor and a portion facing.
When at least a part of the motor is located in the concave portion of the end plate portion of the water tank, heat dissipation from the motor is poor because the motor enters the concave portion. In contrast, those provided with a vent above, depending on Re their heat dissipation from the motor is accelerated, can suppress the temperature rise of the motor.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
First, FIG. 1 shows the overall structure of a drum type washing machine. An outer box 11 forming an outer shell has a laundry entrance 12 at a substantially central portion of a front portion thereof, and a work port 12 is provided at a substantially central portion of a back portion. It has a mouth 13. A door 14 is provided at the laundry entrance 12 so as to be openable and closable, and a back plate 15 forming a part of the back of the outer box 11 is detachably provided at the work opening 13.
[0016]
A water tank 16 is disposed inside the outer case 11 so as to be elastically supported by a support plate 17 and a plurality of sets, for example, four sets (only two sets are shown) of suspensions 18. The water tank 16 has a drum shape, and is disposed inside the outer box 11 in a horizontal axis shape in which the axial direction is forward and backward. Further, the water tub 16 has a connection port 19 substantially at the center of the front end plate portion, and this is connected to the laundry entrance 12 of the outer box 11 by a bellows 20.
[0017]
On the other hand, a concave portion 21 is formed in a rear end plate portion which is a back portion of the water tank 16. Specifically, the concave portion 21 is formed by denting a central portion of a rear end plate portion of the water tank 16 into a mortar shape having a gradually decreasing diameter toward the inside of the water tank 16. It is almost flat.
Further, a drain port (not shown) is formed at the bottom of the water tank 16, and a drain valve 22 is connected to the drain port, and a drain hose 23 is connected to the drain valve 22.
[0018]
The rotating tank 24 is provided inside the water tank 16. The rotary tub 24 has a drum shape smaller in diameter than the water tub 16, functions as a washing tub, functions as a dehydration tub, and further functions as a drying drum. Inside, like the water tank 16, it is rotatably arranged in a horizontal axis shape whose axial direction is forward and backward. A concave portion 25 similar to the concave portion 21 of the water tank 16 is formed in a rear end plate portion which is a back portion of the rotary tank 24, and a hole which is used for water passage and ventilation is formed in the body portion. 26 is formed in almost the entire area (only a part is shown).
[0019]
Here, FIG. 2 shows the driving device portion of the rotary tub 24 in detail. As is apparent from FIG. 2, for example, a rear end plate portion of a plastic water tank 16 is attached with a metal reinforcing plate 27 made of, for example, stainless steel and fixed with a plurality of (partially shown) bolts 28. I have. Further, a plurality of rotating tub supports 29, which also serve as reinforcing plates, made of a metal having a larger thickness are attached to the rear end plate portion of the rotating tub 24 made of metal such as stainless steel (only one is shown in FIG. 1). Bolt 30. In the reinforcing plate 27 and the rotary tank support 29, concave portions 31 and 32 similar to the concave portions 21 and 25 are formed, respectively.
[0020]
On the other hand, in this case, the motor 33 is an outer rotor type brushless motor in which the rotor 34 is positioned outside the radial direction of the stator 35 and rotates, and the stator 35 is, as shown in FIG. It comprises a laminated core 36 and a winding 38 mounted on it via a plastic bobbin 37, for example, all around its circumference.
[0021]
On the other hand, the rotor 34 includes a rotor housing 39, a yoke 40 fixed to the outer peripheral side of the rotor housing 39, and a magnet 41 fixed to the inner peripheral side of the rotor housing 39 with one pole and one arrangement.
[0022]
In addition, the motor 33 has a cylindrical bearing housing 42 shown in FIG. 2, and a stator 35, in particular, a laminated iron core 36, is mounted on a mounting portion 42 a formed to extend outward from an intermediate portion of the bearing housing 42. It is attached by a plurality of bolts 43 (only one is shown). A rotating shaft 44 is inserted through the bearing housing 42, and is rotatably supported by a front bearing 45, an outer collar 46, an inner collar 47, and a rear bearing 48. With the rotating shaft 44 supported in this manner, the rear bearing 48 that is a part of the front bearing 45 and the rear bearing 48 is located inside the stator 35.
[0023]
On the other hand, shaft insertion holes 49 and 50 are formed in the center of the recess 31 of the reinforcing plate 27 and the center of the recess 21 of the water tank 16, respectively. The rotation shaft 44 of the motor 33 is inserted through the shaft from the rear. At the same time, the bearing housing 42 is inserted into the shaft insertion hole 49, and the bearing housing 42 is inserted into the shaft insertion hole 50. In addition, between the shaft insertion hole 50 of the water tank 16 and the bearing housing 42, a seal 51 for sealing the space between the shaft insertion hole 50 and the peripheral surface of the rotary tank shaft 23 in a watertight manner is previously sandwiched.
[0024]
Then, the mounting portion 42a of the bearing housing 42 is fixed to the inner part of the concave portion 31 of the reinforcing plate 27 by a plurality of bolts 52 (only one is shown). Further, the center of the rotor 34, especially the center of the rotor housing 39, is fitted to the rear end of the rotating shaft 44 projecting rearward from the bearing housing 42, and integrated by serration or the like and tightening by the nut 53. It is installed to rotate.
[0025]
Thus, the motor 33 is mounted on the back of the water tank 16, and in this mounted state, the motor 33 includes the intermediate portion of the rotating shaft 44, the front bearing 45, the front half of each of the outer collar 46 and the inner collar 47, The front half of the bearing housing 42, the front half of the stator 35, and the front of the rotor 34, that is, the entire front half of the entire rotor are located inside the recess 21 of the water tank 16.
[0026]
Further, the dimension C of the motor 33 shown in FIG. 1 which is located in the concave portion 21 corresponds to the partner that comes into contact with the outer box 11 when the water tank 16 vibrates during washing, rinsing, dehydration, and drying. The dimensions are such that the member becomes a member other than the motor 33 (for example, the water tank 16), that is, the motor 33 leaves a gap between the motor 33 and the outer box 11 when the member other than the motor 33 comes into contact with the outer box 11. D, E and F in FIG. 1 are thus between the periphery of the back of the water tank 16 and the inner surface of the back of the outer box 11, between the periphery of the back of the rotor 34 of the motor 33 and the inner surface of the outer box 11, and The distance between the corner of the back of the rotor 34 of the motor 33 on the center side and the inner surface of the outer box 11 are shown.
[0027]
The front end of the rotating shaft 44 protruding forward from the bearing housing 42 has the center of the depth of the recess 25 of the rotary tub 24 sandwiched by the center of the depth of the recess 32 of the rotary tub support 29. Are fixed by a plurality of bolts 54 (only one part is shown). In addition, a cap 55 that covers each head of the bolt 54 is attached to the front end of the rotary tank shaft 23 with a screw 56.
[0028]
Further, an insulating base 57 is provided on the stator 35 of the motor 33, and the insulating base 57 embeds a rotation sensor 58 which is a detecting means for detecting the rotation of the rotary tub 24.
[0029]
The washing machine according to the present embodiment detects the amount of laundry, the amount of dry laundry, or the amount of imbalance based on the detection result of the rotation sensor 58, and performs the operation based on the detection and the detection result. A control device 59 (see FIG. 1) for controlling the above is provided at the upper front part of the outer case 11. Further, the washing machine of the present embodiment not only performs washing and dehydration of the laundry, but also performs drying. Although not shown, for example, a blowing device, a dehumidifying device, a heater, and the like for the drying are provided. It has a drying function part.
[0030]
Next, the operation of the above configuration will be described.
When washing, dehydrating, or drying the laundry, the motor 33 rotates the rotor 34 by energizing the winding 38, and the rotation of the rotor 34 is directly transmitted to the rotating tub 24 by the rotating shaft 44. As a result, the rotary tank 24 is driven to rotate.
[0031]
As described above, in this configuration, the rotational power of the motor 33 is directly transmitted to the rotary tank 24, and a belt transmission mechanism unlike the conventional one is not required. Therefore, as described above, the cost can be reduced, and at the same time, the operation vibration and the noise can be reduced. In addition, since the motor 33 is provided at the back of the water tank 16, maintenance such as inspection, repair, and replacement of the motor 33 can be easily performed, and the configuration of an abnormal water level detection device and an electric safety device for the flooding of the motor 33 and the like. Is unnecessary, and the cost can be further reduced.
[0032]
A recess 21 is formed in the back of the water tank 16, and the front half of the motor 33 is positioned inside the recess 21. As a result, the motor 33 can be positioned in front of the water tank 1 provided with the motor 2 protruding from the back of the water tank 1, and the dimensions E and F for avoiding the collision of the motor 33 with the outer box 11 are secured accordingly. In addition, the dimension G between the back of the water tank 16 and the back of the outer box 11 can be made smaller than the dimension A between the back of the conventional water tank 1 and the back of the outer box 6 and the depth H of the outer box. Can be made smaller than the depth dimension B of the conventional outer box 1.
[0033]
In this case, the internal volume of the water tub 16 is reduced by the concave portion 21, and accordingly, the internal volume of the rotary tub 24 may be reduced by the concave portion 25. The object is often located at the lower part in the rotary tub 24, and even if it is moved by the rotation of the rotary tub 24, it moves along the inner peripheral portion of the rotary tub 24, and the inner volume of the spine 24 is reduced by the concave portion 25 on the back. Substantially unaffected by reduction. Therefore, the washing capacity does not decrease.
[0034]
In this case, if the depth dimension H of the outer box 11 is kept equal to that of the conventional case, the depth dimension of the water tank 16 and the depth dimension of the rotary tank 24 are increased by the resulting space in the outer box 11. It can be increased to increase the respective effective internal volume and increase the washing capacity.
[0035]
In addition, in the case of this configuration, the motor 33 is an outer rotor type and is flat in the axial direction (front-rear direction). The front portion of the rotor 34 of the flat outer rotor type motor 33 is placed inside the recess 21. It is located. Thereby, the depth dimension H of the outer box can be further reduced.
[0036]
Also, when the water tank 16 vibrates during operation, the mating member that comes into contact with the outer case 11 becomes something other than the motor 33, and the front half of the motor 33 is positioned inside the recess 21. Thereby, when the water tank 16 vibrates during operation, before the motor 33 comes into contact with the outer box 11, something other than the motor 33 (for example, the water tank 16) comes into contact with the outer box 11, whereby Collision of the motor 33 with the outer case 11 can be more reliably avoided, and damage to the motor 33 can be more reliably prevented.
[0037]
Further, a rotating shaft 44 of the motor 33 is directly connected to the rotating tub 24, and a rear bearing 48, which is a part of a bearing for supporting the rotating shaft 44, is located inside the stator 35 of the motor 33. As a result, the space inside the stator 35 of the motor 33 can be used for arranging the rear bearing 48, and the bearing 48 is no longer located outside the motor 33. Therefore, an increase in the depth H of the outer box is further suppressed. can do.
[0038]
4 and 5 show the second and third embodiments of the present invention, in which the same reference numerals are given to the same parts as those in the first embodiment, and the description thereof will be omitted. Only different parts will be described.
[Second embodiment]
In the second embodiment shown in FIG. 4, a vent 61 is formed in the back plate 15, which is a portion of the back of the outer case 11 facing the motor 33. In this case, the vent 61 is composed of a number of small holes.
[0039]
As described above, when the front half of the motor 33 is positioned in the concave portion 21 at the back of the water tank 16, the heat dissipation from the motor 33 becomes poor because the motor 33 enters the concave portion 21. On the other hand, in the case where the above-described vent 61 is provided, the heat emitted from the motor 33 is radiated to the outside through the vent 61, so that the heat dissipation of the motor 33 can be promoted and the temperature of the motor 33 can be increased. The rise can be suppressed.
[0040]
[Third embodiment]
In the third embodiment shown in FIG. 5, the motor 33 is provided with a blower blade 71 for cooling. In this case, in detail, a plurality of, for example, integrally formed blower blades 71 are provided on the outer peripheral portion of the rotor 34 of the motor 33, and function as centrifugal blower blades.
In this case, the heat emitted from the motor 33 is dissipated to the surroundings (outside the concave portion 21) by the rotation of the blower blade 71 with the rotation of the motor 33, so that the heat dissipation of the motor 33 can be promoted as described above. Thus, the temperature rise of the motor 33 can be suppressed.
[0041]
In addition, the present invention is not limited to the embodiment described above and shown in the drawings. In particular, the motor 33 only needs to be positioned at least partially in the recess 21. The present invention is not limited to the one where the half part is located, and other parts or the whole may be located in the recess 21.
When the motor 33 is of an outer rotor type, at least a part of the rotor 34 may be located in the recess 21, and is not limited to the above-described one in which only the front part is located. Up to or even in this case, the entirety may be located in the recess 21.
[0042]
On the other hand, the concave portion 21 is not limited to being formed by denting the entire central portion of the back of the water tank 16, and may be formed by denting the back of the water tank 16 from the peripheral edge to the whole.
[0043]
Further, basically, the motor 33 is not limited to the outer rotor type, and may be an inner rotor type in which the rotor is located inside the stator. In addition, the rotor and the stator face in the radial direction. The present invention is not limited to the radial gap type, and may be an axial gap type that faces in the axial direction.
Further, the water tank 16 and the rotary tank 24 may be supported at a slant from the horizontal horizontal axis state, and may be provided substantially in the horizontal axis state. In addition, the drying function does not necessarily have to be provided.
[0044]
【The invention's effect】
The present invention is as described above, and has the following effects.
According to the drum-type washing machine of the present invention, the motor provided to directly rotate the rotary tub at the end plate portion of the water tub is provided. Can be reduced in depth dimension. Further, the collision of the motor with the outer case can be more reliably avoided, and the damage of the motor can be more reliably prevented.
[0046]
According to claim 2 of the drum type washing machine, and can facilitate heat dissipation may eliminate prone motor, Ru can suppress an increase in the temperature of the motor.
[Brief description of the drawings]
FIG. 1 is an overall cutaway side view showing a first embodiment of the present invention; FIG. 2 is a large longitudinal sectional side view of a motor part; FIG. 3 is an exploded perspective view of a rotor and a stator of the motor; FIG. 1 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention. FIG. 5 is a diagram corresponding to FIG. 1 showing a third embodiment of the present invention. FIG. 6 is a diagram corresponding to FIG.
11 is an outer box, 16 is a water tank, 21 is a recess, 24 is a rotating tank, 33 is a motor, 34 is a rotor, 35 is a stator, 42 is a bearing housing, 44 is a rotating shaft, 45 is a front bearing, and 48 is a rear bearing. C is a dimension located in the concave portion of the motor, 61 is a vent, and 71 is a blower blade.

Claims (2)

A water tank elastically disposed inside the outer box,
A rotating tank arranged rotatably in a substantially horizontal axis state inside the water tank,
A motor that is provided on an end plate portion of the water tank and is directly connected to the rotation tank and rotationally drives the rotation tank;
Forming a concave portion in the end plate portion of the water tank,
A drum-type washing machine wherein at least a part of the motor is positioned inside the recess by a size such that a counterpart member contacting the outer case is other than the motor when the water tub vibrates during operation. Machine. 2. The drum type washing machine according to claim 1 , wherein a vent is formed in a portion of the outer box facing the motor .

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