JP2016106865A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive washing machine in which coil winding temperature of a circulation pump is suppressed.SOLUTION: The washing machine comprise: a water tub 7 supported in a freely oscillatable manner inside an outer case 2; a washing and dewatering tub 8 disposed in a rotatable manner inside the water tub 7 and having a plurality of small holes in the peripheral wall of the tub 8; and a pump 17 for processing washing water inside the water tub 7. The pump 17 has: a pump casing 25 including a rotation runner 23; and a pump motor 26 for rotationally driving the rotation runner 23. The pump motor 26 has: a stator 26a; a rotor 33 disposed in an outer periphery of the stator 26a; and a motor cover 27 for accommodating the stator 26a and the rotor 33. By forming a through-hole 33c for communicating the inside and the outside of the rotor 33 in the rotor 33, the air outside and inside of the rotor 33 is circulated, heat generation of a coil of the stator 26a included in the rotor 33 is suppressed, and deterioration of pump performance is prevented inexpensively.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a washing machine having a pump.

  Conventionally, as a pump for this type of washing machine, a circulation pump that sucks up washing water in a water tank and distributes it on clothes in a washing and dewatering tank is known. In the circulation pump, the rotor is disposed on the outer periphery of the stator. There has been proposed a configuration in which an outer rotor system is composed of a cylindrical portion including a magnet and a disk portion that fastens a shaft (see, for example, Patent Document 1).

  FIG. 6 is a cross-sectional view of a circulation pump of a conventional washing machine described in Patent Document 1.

  In FIG. 6, the circulation pump 77 has a rotary runner 23 inside the pump casing 25 and is driven by the rotary shaft 31 of the pump motor 26. The pump motor 26 includes a stator 26a, a rotor 73, and a motor cover 27 that houses them. The rotor 73 is a disc that fastens the rotating shaft 31 and a cylindrical portion 73a that includes a magnet 32 on the outer periphery of the stator 26a. It is set as the structure used as the outer rotor system which consists of the part 73b.

  Moreover, in order to suppress the temperature rise of the pump motor that drives the pump unit, a configuration in which blades that generate cooling air are connected to a shaft has also been proposed (see, for example, Patent Document 2).

  FIG. 7 is a cross-sectional view of a circulation pump of a conventional washing machine described in Patent Document 2.

  In FIG. 7, the circulation pump has a rotary runner 62 fastened to a shaft 61 of a pump motor 60, and the periphery thereof is stored in a pump casing 63. And the cooling blade 64 for suppressing the winding temperature of the pump motor 60 is fastened to the shaft 61, and the air is blown by the rotation of the pump motor.

JP 2010-104404 A JP 2008-157254 A

  However, in the configuration of Patent Document 1, since the stator winding is contained by the outer rotor type rotor, heat dissipation from the stator winding becomes insufficient, and the pump performance decreases or the insulation performance decreases. There was a problem that deterioration might progress.

  Moreover, in the structure of patent document 2, it was necessary to provide a cooling blade outside a pump motor, and there existed a subject that cost started.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a drum type washing machine having an inexpensive circulation pump that can improve the heat dissipation efficiency of a winding of a stator enclosed by an outer rotor.

  In order to solve the above-described conventional problems, a washing machine of the present invention includes a water tub that is swingably supported inside an outer box, and a laundry having a plurality of small holes in a peripheral wall that is rotatably arranged inside the water tub. A dehydration tank and a pump for treating washing water inside the water tank, the pump having a pump casing containing a rotating runner, and a pump motor for rotating the rotating runner, the pump motor being A stator, a rotor disposed on the outer periphery of the stator, and a motor cover that houses the stator and the rotor, and the rotor has a through hole that communicates the inside and the outside of the rotor. is there.

  Accordingly, by circulating the air inside and outside the rotor, heat generation of the stator windings contained in the rotor can be suppressed, and the pump performance can be prevented from being lowered at low cost.

  The pump used in the washing machine of the present invention can suppress the heat generation of the winding of the stator contained in the rotor, and can prevent the pump performance from being lowered at a low cost.

The longitudinal cross-sectional view of the drum type washing machine in Embodiment 1 of this invention Cross section of the main part of the circulation pump of the drum type washing machine Perspective view of the rotor of the circulation pump of the drum type washing machine Sectional drawing of the principal part of the circulation pump of the drum type washing machine in Embodiment 2 of this invention Sectional drawing of the principal part of the circulation pump of the drum type washing machine in Embodiment 3 of this invention Sectional drawing of the principal part of the conventional circulation pump described in Patent Document 1 Sectional drawing in which a conventional circulation pump described in Patent Document 2 is partially cut away

  A first invention includes a water tub that is swingably supported inside an outer box, a washing and dewatering tub having a large number of small holes in a peripheral wall that is rotatably arranged inside the water tub, and washing water inside the water tub. The pump has a pump casing containing a rotary runner, and a pump motor that rotationally drives the rotary runner, and the pump motor is disposed on the stator and the outer periphery of the stator. The rotor has a motor cover that houses the stator and the rotor, and the rotor is formed with a through hole that communicates the inside and the outside of the rotor to circulate the air inside and outside the rotor. As a result, the heat generation of the stator windings contained in the rotor can be suppressed, and the pump performance can be prevented from lowering at low cost.

  According to a second aspect of the present invention, in the first aspect, the rotor is formed with a raised portion at the periphery of the through-hole, thereby circulating the air between the outside and the inside of the rotor, so that the stator included in the rotor The heat generation of the windings can be suppressed, and the pump performance can be prevented from being lowered at a low cost.

  According to a third aspect, in the first or second aspect, the motor cover is formed with a vent hole that communicates the inside and the outside of the motor cover to circulate the air between the outside and the inside of the motor cover. As a result, heat dissipation inside the motor cover can be promoted, heat generation of the stator windings can be suppressed, and a reduction in pump performance can be prevented at a low cost.

  Hereinafter, embodiments of the invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a longitudinal sectional view of a drum type washing machine according to Embodiment 1 of the present invention, FIG. 2 is a sectional view of a main part of a circulation pump of the drum type washing machine, and FIG. 3 is a drum type washing machine. The perspective view of the rotor of the circulation pump of FIG.

  As shown in FIG. 1, the drum-type washing machine according to the present embodiment has a substantially rectangular box-shaped outer box 2 above a rectangular base frame 1, and an operation panel 4 above the outer box 2, The panel board 3 provided with the water supply port 5 is arranged.

  A water tank 7 is swingably supported by a suspension 6 on the inner side of the outer box 2, and a washing and dewatering tank 8 having a large number of small holes 9 in the peripheral wall is rotatable inside the water tank 7. Is pivotally supported.

  A lid 10 is disposed in front of the outer box 2 so as to be openable and closable corresponding to the opening 11 of the washing and dewatering tub 8 and the water tub opening 12 of the water tank 7.

  Washing water is supplied from the water supply valve 13 connected to the water supply port 5 above the panel board 3 to the inside of the washing / dehydrating tub 8 and the water tub 7, and the washing / dehydrating tub 8 is fixed to the outer bottom of the water tub 7. Rotation driving is performed and washing operation and rinsing operation are performed.

  A drain hose 16 is connected to the bottom drain port 15 of the water tank 7 and piped to the circulation pump 17, and a discharge hose 18 connected to the circulation pump 17 extends upward and is disposed at the water tank opening 12. The washing water 20 is spread from the opening 19 to the inner garment 21 through the water mouth 19, and the washing liquid is efficiently infiltrated into the laundry so that the washing effect is enhanced.

  As shown in the cross-sectional view of the main part of FIG. 2, the washing machine pump constituting the circulation pump 17 is connected to the discharge hose 16 and the inlet 22 into which the washing water 20 flows, and is arranged substantially at right angles to the inlet 22. A so-called centrifugal force composed of a pump casing 25 having a discharge port 24 connected to the discharge hose 18, a rotary runner 23 disposed coaxially with the inlet 22, and a pump motor 26 that rotationally drives the rotary runner 23. This is a type of pump configuration.

  A bearing plate 28 is disposed between the motor cover 27 housing the pump motor 26 and the pump casing 25, and the outer peripheral portion of the bearing plate 28 and the pump casing 25 is watertight through an O-ring 29 such as rubber. The rotary shaft 31 of the center rotation runner 23 is fixed and sealed with a water seal 30.

  The rotating shaft 31 is fixed to a rotor (rotor) 33 of a pump motor 26 having a magnet 32 and is rotatably supported by a plurality of bearings 34 provided in the bearing plate 28.

  The shape of the rotary runner 23 forms an arc-shaped skirt portion 35 having a radius (R) having a large cross section from the tip on the inlet 22 side toward the outer periphery of the substantially disc-shaped runner substrate 36.

  Further, the plurality of blades 38 formed on the outer periphery of the central boss portion 37 form an extended blade 39 that extends to the back surface side (the right side in FIG. 2) of the runner substrate 36.

  Further, a plurality of cylindrical ribs 40a and inner cylindrical ribs 40b are formed on the back surface side (right side in FIG. 2) of the runner substrate 36, while the boss portion 42 to which the water seal 30 at the center of the bearing plate 28 is attached. The labyrinth rib 41 is formed in a labyrinth shape so that the tip of the cylindrical labyrinth rib 41 overlaps between the cylindrical rib 40a and the inner cylindrical rib 40b and enters the runner board 36 side from the end. doing.

  The bearing plate 28 that supports the plurality of bearings 34 and the water seal 30 that support the rotary shaft 31 that is the rotary shaft of the rotary runner 23 and that is also the rotary shaft of the pump motor 26 is attached to the water seal 30. An opening 43 is formed in the vicinity of the pump motor 26, and this opening 43 communicates outward from the through hole 45 of the motor cover 27 through a drainage passage 44 formed integrally with the bearing plate 28.

  Here, the rotor 33 is an outer rotor system comprising a cylindrical portion 33a on the inner wall facing the stator 26a and a magnet portion 32a, and a disc portion 33b for fastening the cylindrical portion 33a and the rotary shaft 31. . The cylindrical portion 33a is provided with a through hole 33c.

  FIG. 3 shows a perspective view of the rotor 33 as seen from the side opposite to the pump (the right side in FIG. 2).

  In FIG. 3, the disk portion 33 b is firmly fastened to the rotary shaft 31 by caulking or the like at the center portion thereof. The outer periphery of the disk portion 33b integrally forms a cylindrical portion 33a by pressing. A plurality of U-shaped through holes 33c are provided on the disk portion 33b side of the cylindrical portion 33a.

  The operation and action of the circulation pump of the drum type washing machine configured as described above will be described below.

  The pump motor 26 employs an outer rotor system, and since the winding of the stator 26a is included in the rotor 33, heat dissipation from the winding of the stator 26a is not performed well. In particular, if the circulation flow rate of the circulation pump 17 is increased or the drive time of the circulation pump 17 is increased, the heat radiation of the windings of the stator 26a becomes insufficient.

  In the present embodiment, since the plurality of through holes 33c are provided on the disk portion 33b side of the cylindrical portion 33a of the rotor 33, air can be circulated inside and outside the rotor 33, and the winding is cooled. Can do. Thereby, it becomes possible to suppress that pump performance falls by the temperature rise of the coil | winding of the stator 26a.

  In addition, although the through-hole 33c has shown the embodiment formed in U shape in two places in FIG. 3 of this Embodiment 1, it is not limited to two places, Moreover, it is U-shape. It is not limited. The position and location of the through hole 33c formed according to the strength, workability, and cooling performance of the rotor can be appropriately selected. Further, the through hole 33c may be formed in the disk portion 33b.

  As described above, in the first embodiment, the pump motor 26 of the circulation pump 17 circulates air between the outside and the inside of the rotor 33 by providing a plurality of through holes 33 c in the rotor 33, thereby Heat generation of the windings of the stator 26a included in 33 can be suppressed, and a reduction in pump performance can be prevented at a low cost.

(Embodiment 2)
FIG. 4 is a cross-sectional view of a main part of the circulation pump of the drum type washing machine in the second embodiment of the present invention.

  In the second embodiment, the configuration other than the shape of the rotor of the pump motor constituting the circulation pump is the same as that of the first embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals. Detailed description is omitted.

As shown in FIG. 4, a through hole 53 c having a cut-and-raised portion 53 d is formed in the cylindrical portion 33 a of the rotor 33 of the pump motor 56 constituting the circulation pump 57. This cut-and-raised portion 53d can be formed simultaneously by press working when forming the through-hole 53c. In FIG. 4, the cut-and-raised portion 53d is cut and raised in the axial direction, and is configured to be connected to the cylindrical portion 53a on the pump casing 25 side.

  By forming the through-hole 53c and the cut-and-raised portion 53d, it becomes possible to circulate the air inside and outside the rotor 53 and cool the winding, so that the pump performance deteriorates due to heat generation of the winding of the stator 26a. Can be suppressed.

  The cut-and-raised portion 53d may be configured to be connected to the cylindrical portion 53a on the circumferential direction side, and the cut-and-raised portion 53d may have a function as a blade. By forming the cut-and-raised part 53d into a shape having a function as a blade, it becomes possible to circulate the air inside and outside the rotor 33 more efficiently, and to improve the cooling efficiency of the winding.

  Further, the cut-and-raised portion 53d may be cut and raised inside the rotor 53 after securing a clearance with the stator 26a, not the outside.

  As described above, in the second embodiment, the cylindrical portion 53a of the rotor 53 is provided with the plurality of through holes 53c having the cut-and-raised portions 53d, so that the air between the outside and the inside of the rotor 53 is supplied. By circulating, the heat generation of the winding of the stator 26a included in the rotor 53 can be suppressed, and the pump performance can be prevented from being lowered at a low cost.

(Embodiment 3)
FIG. 5 shows a cross-sectional view of a main part of the circulation pump of the drum type washing machine in Embodiment 3 of the present invention.

  In the third embodiment, the configuration other than the shape of the motor cover constituting the circulation pump is the same as that of the first embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals and detailed. Description is omitted.

  In FIG. 5, the motor cover 68 constituting the circulation pump 67 is formed with a lower surface vent 68a on the lower surface side of the peripheral side surface and a rear surface vent 68b at the lower portion of the rear surface (on the counter-rotating runner 23). The rear surface vent hole 68b is formed with a collar portion 68c that is open on the lower side. The lower surface vent hole 68a and the rear surface vent hole 68b are configured to open downward so that water does not enter the motor cover 68 even when water drops from above. .

  The lower surface vent hole 68a and the rear surface vent hole 68b allow outside air to be taken into the motor cover 68, and the taken outside air can be circulated into the rotor 33 through the through-hole 33c. Since it can cool efficiently, it becomes possible to suppress the fall of the pump performance by the heat_generation | fever of the coil | winding of the rotor 33. FIG.

  In the third embodiment, the vent holes are formed on the peripheral side surface and the rear surface of the motor cover 68, respectively. However, the vent holes may be formed on only one of the peripheral side surface and the rear surface.

  As described above, in the third embodiment, the pump motor 66 of the circulation pump 67 has the lower surface vent 68a formed on the lower surface side of the motor cover 68 that houses the stator 26a and the rotor 33, and the lower portion on the rear surface side. Since the rear vent 68b is formed, external air is circulated in the motor cover 68, heat dissipation inside the motor cover 68 is promoted to suppress heat generation of the windings, and pump performance is reduced at low cost. Can be prevented.

  In the first to third embodiments, the structure of the circulation pump that circulates and distributes the wash water from the opening 11 to the clothes inside is described as an example in order to enhance the cleaning effect. You may use for the drainage pump which drains water outside the machine.

  Moreover, you may mount the pump of this invention in vertical type washing machines other than a drum type washing machine.

  As described above, since the washing machine according to the present invention has the through hole in the rotor cylindrical portion of the pump, it is possible to suppress the heat generation of the winding without providing the cooling blade of another part. It can be applied to other washing machines having a pump.

2 Outer box 7 Water tank 8 Washing and dewatering tank 9 Small hole 14 Motor 17 Circulating pump 22 Inlet 23 Rotating runner 24 Discharge port 25 Pump casing 26 Pump motor 26a Stator 27 Motor cover 31 Rotating shaft 32 Magnet 33 Rotor 33a Cylindrical part 33b Disk Part 33c Through-hole 33d Cut and raised part 57 Circulation pump 66 Pump motor 67 Circulation pump 68 Motor cover 68a Bottom face vent hole 68b Rear face vent hole 68c Gutter part

Claims (3)

A water tank supported in a swingable manner inside the outer box, a washing and dewatering tank having a large number of small holes in a peripheral wall rotatably arranged inside the water tank, and a pump for treating the washing water inside the water tank The pump includes a pump casing containing a rotary runner, and a pump motor that rotationally drives the rotary runner. The pump motor includes a stator, a rotor disposed on an outer periphery of the stator, and the stator. A washing machine, comprising: a motor cover that houses a rotor; and a through hole formed in the rotor for communicating the inside and the outside of the rotor. The washing machine according to claim 1, wherein the rotor is formed with a cut-and-raised portion at the periphery of the through hole. The washing machine according to claim 1 or 2, wherein the motor cover is formed with a vent hole that communicates the inside of the motor cover with the harmful part.

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