KR20090097523A - Drum-type washing machine - Google Patents

Abstract

A washing machine is provided to prevent the damage or breakdown by reducing the noise and vibration from a motor by adding a stator bracket. A washing machine comprises a tub, an outer motor, and a stator bracket(60). The outer motor has a stator(30) and a rotor. The stator is behind fixed of the tub. The rotor is rotated around the stator. One side of the stator bracket is inserted into the inner side of the stator. The stator is formed with the ring shape including a hollow part.

Description

Drum washing machine {Drum-type washing machine}

The present invention relates to a drum washing machine, and more particularly to a drum washing machine to reduce the noise generated by the motor.

In general, a drum washing machine is made in a manner in which detergent and laundry are put in a drum, and washing is performed using frictional force and gravity of a rotating drum and laundry by receiving a driving force of a motor.

According to the drum washing machine, there is almost no damage to the laundry, the laundry does not get tangled with each other, and knocking and rubbing can produce a washing effect.

Referring to Figure 1 briefly described the structure of a conventional drum washing machine as follows.

1 is a vertical cross-sectional view illustrating a conventional drum washing machine, in which a tub 2 is installed inside a cabinet 1, and a drum 3 is rotatably installed at an inner center of the tub 2. A motor 5a is installed at the lower side of the tub 2, and a motor pulley 18 is axially connected to the motor 5a.

Meanwhile, a drum shaft 4 is installed at the rear of the drum 3, and a drum pulley 19 is installed at the drum shaft 4. In addition, the drum pulley 19 provided on the drum shaft 4 and the motor pulley 18 connected to the motor 5a are connected by a belt 20 which is a power transmission element.

A door 21 is installed in front of the cabinet 1, and a gasket 22 is installed between the door 21 and the tub 2. Meanwhile, a hanging spring 23 for supporting the tub 2 is installed between the inside of the upper surface of the cabinet 1 and the upper side of the outer peripheral surface of the tub 2, and the inside of the lower surface of the cabinet 1 and the tub. (2) A friction damper 24 is provided between the lower side of the outer circumferential surface to damp the vibration of the tub 2 generated during dehydration.

That is, in the conventional washing machine, the driving force of the motor 5a is transmitted from the motor pulley 18 to the belt 20 connecting the motor pulley 18 and the drum pulley 19. And, the driving force was generally made of a structure that is transmitted from the belt 20 to the drum pulley 19 and the drum shaft (4).

According to the conventional drum washing machine, since the driving force of the motor 5a is not directly transmitted to the drum 3, it is transmitted after passing through many parts such as the motor pulley 18 and the drum pulley 19, the belt 20, Many losses and noises occur during power transmission.

In addition, vibration generated while the drum pulley 19 and the drum shaft 4 rotate is transmitted to the drum 2. Therefore, a crack or the like due to vibration may be formed at a portion where the drum shaft 4 and the drum 3 are coupled, and there is a risk of serious damage to the drum washing machine.

The present invention is to solve the above problems, the present invention is to provide a drum washing machine that can reduce the noise generated when the motor rotates.

In addition, to provide a drum washing machine to reduce the vibration generated when the motor is rotated to prevent the drum of the drum washing machine and the like.

In order to achieve the above object, the present invention is a tub; An outer rotor type motor having a stator fixed to the rear of the tub and a rotor rotatable about the stator; And a stator bracket, one side of which is inserted into the inside of the stator.

And, the stator is preferably made of an annular hollow formed.

The stator bracket may include an insertion part inserted into the hollow part and a fixing part extending vertically from the insertion part, and the insertion part may have an annular outer diameter smaller than the inner diameter of the hollow part.

Of course, the depth of the insertion portion is the same as the depth of the hollow portion, the fixing portion may be formed in an annular extending radially from the insertion portion.

In particular, the fixing part may be fixed in surface contact with the rear or front of the stator.

And, it is possible to further include a coupling member for fixing the fixing part to the stator, the stator bracket may be manufactured by die casting (Die Castiong).

Vibration and noise by the motor according to the present invention described above can be reduced. Therefore, the drum washing machine can be prevented from being damaged.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

Figure 2 is a longitudinal sectional view schematically showing the configuration of the drum washing machine of the present invention.

Hereinafter, the structure of the drum washing machine according to the present invention will be briefly described with reference to FIG. 2.

The drum washing machine includes a cabinet (1) forming an appearance, a tub (2) in which laundry is accommodated inside the cabinet (1), a drum (3) rotatably inserted into the tub (2), and the cabinet (1). There is provided a door 21 that can open and close the opening.

In addition, a hanging spring 23 for supporting the tub 2 is installed between the inside of the upper surface of the cabinet 1 and the upper side of the outer peripheral surface of the tub 2, and the inside of the lower surface of the cabinet 1 and the tub. (2) A friction damper 24 is provided between the lower side of the outer circumferential surface to damp the vibration of the tub 2 generated during dehydration.

And, the rear of the tub (2) is equipped with a motor (5) for providing a driving force for rotating the drum (3). According to the present invention, the motor 5 is directly mounted to the rear of the tub 2, and unlike the conventional drum washing machine, the rotational force generated by the motor 5 can be directly transmitted to the drum 3. .

Therefore, according to the present invention, the number of parts required for transmitting the driving force of the motor 5 to the drum 3 can be reduced. Therefore, it is possible to reduce the noise and the loss of energy generated when transmitting the driving force of the motor (5). Of course, since the number of operating parts is reduced, the vibration of the drum washing machine is also reduced.

3 is a perspective view illustrating a stator and a stator bracket according to the present invention. In Figure 3 is an exploded perspective view of the state before the stator and the stator bracket is coupled.

Hereinafter, the structure of the stator and the stator bracket according to the present invention will be briefly described with reference to FIG. 3.

The stator 30 is an annular stator core (SC) having a multi-layer structure while spirally rotating an iron plate formed of a tooth and a base part from the bottom layer to the top layer, and the outside of the stator core (SC) by insert molding. It is formed to surround the surface includes an insulator 34 to electrically insulate the stator core (SC).

A hollow portion 40 is formed at the center of the stator 30, and the stator 30 is formed in an annular shape as a whole. That is, the hollow portion 40 may have a substantially circular shape.

In addition, in order to fix the stator 30 to the tub 2, a plurality of protrusions are integrally formed on the inner circumferential surface side of the stator core SC and protrude toward the center of the stator 30. And a fastening portion 36. Since the number of the fastening parts 36 is only one embodiment, it is not limited to the bar shown in FIG. 3. However, it is preferable that the fastening part 36 is two or more.

In addition, a fastening hole 38 for coupling the stator 30 to the back of the tub 2 is formed at the center of the fastening part 36. The fastening holes 38 are formed in the respective fastening portions 36.

Meanwhile, the stator bracket 60 includes an insertion portion 62 inserted into the hollow portion 40 and a fixing portion 64 extending vertically from the insertion portion 62. The insertion part 62 and the fixing part 64 may be integrally formed.

The outer diameter of the insertion portion 62 is preferably smaller than the inner diameter of the hollow portion 40. This is to facilitate the assembly of the drum washing machine by allowing the insertion part 62 to be smoothly inserted into the hollow part 40.

In addition, the insertion part 62 may be formed in an annular shape with a hole inside. Of course, the insertion portion 62 may have a cylindrical shape in which no hole is formed therein.

The depth of the insertion portion 62 is preferably the same as the depth of the hollow portion 40. Of course, the depth of the insertion portion 62 may be smaller than the depth of the hollow portion 40.

If the depth of the insertion portion 62 is deeper than the depth of the hollow portion 40, when the insertion portion 62 is inserted into the hollow portion 40, one end of the insertion portion 62 is the hollow portion It protrudes out of 40. In this case, since there is a need for additional space for the stator bracket 60, there is a problem that the space efficiency is reduced.

The fixing part 64 may be formed in an annular shape extending radially from the inserting part 62. That is, the fixing portion 64 is formed toward the outside of the insertion portion 62 rather than the inside of the insertion portion 62 at one end of the insertion portion 62. Of course, it is also possible to extend a predetermined length toward the inside of the insertion portion (62).

However, in order to facilitate the coupling with the stator 30 of the present invention, the fixing portion 64 is preferably formed in the outward direction at one end of the insertion portion 62.

The fixing part 64 is fixed while being in surface contact with the stator 30. In other words, the fixing portion 64 is in surface contact with the plurality of fastening portions 36 of the stator 30.

3 and 4 illustrate an example in which the fixing unit 64 is fixed while being in surface contact with the front surface of the stator 30. do.

A plurality of fasteners 66 communicating with the fastening holes 38 of the stator 30 are formed in the fixing part 64. The fastener 66 is preferably formed in the same number as the fastening hole 38. In addition, the fastener 66 is preferably formed to communicate with the fastening hole 38 on the same axis.

In addition, it is preferable that the outer circumferential surface of the fastener 66 is formed with a stepped portion so that the coupling member 80 can be coupled to the fixing portion 64 in a recessed form. The stepped portion may be recessed by the depth of the head of the coupling member 80. In addition, the outer peripheral surface of the step is preferably the same shape as the cross-sectional area of the head of the coupling member (80). This is to prevent the coupling member 80 from occupying an additional space when it is fixed to the fastener 66.

The stator 30 and the stator bracket 60 are coupled by the coupling member 80. In addition, the coupling member 80 fixes the stator 30 and the stator bracket 60 to the rear of the tub (2). For example, the coupling member 80 may include a bolt or a screw.

The coupling member 80 is a member conventionally used when coupling the stator 30 to the tub 2. On the other hand, in the present invention, the stator 30 and the stator bracket 60 may be simultaneously coupled to the tub 2 by the coupling member 80. Therefore, the present invention has the advantage that it is not necessary to provide a separate fastening member for fixing the stator bracket 60.

On the other hand, the stator bracket 60 may be manufactured by die casting.

Die casting, also known as die casting, is a precision casting method in which molten metal is injected into a steel die that is precisely machined to perfectly match the required casting shape to obtain the same casting as the die. In addition to the advantages of almost no need for finishing because the dimensions are accurate, it has excellent mechanical properties and mass production.

FIG. 4 is a detailed view of portion A of FIG. 2 and is a longitudinal cross-sectional view illustrating a structure of a driving unit according to a first embodiment of the present invention. 4 illustrates a state in which the stator, the stator bracket, and the fastening member of FIG. 3 are coupled to the tub.

A description with reference to FIG. 4 is as follows.

The drum washing machine according to the first embodiment includes a metal tub (2), a drum (3) rotatably installed inside the tub (2), and a motor (5) fixed to the rear of the tub (2). do.

The motor 5 is preferably an outer rotor-type motor rotatable about the stator while the rotor is located outside the stator. Of course, the present invention is applicable to not only an outer rotor type motor but also an inner rotor type motor. However, for the convenience of the following description, only the outer rotor type motor will be described.

The motor 5 has a stator 30 mounted to the rear of the tub 2 and a rotor 70 rotatable about the stator 30. The stator 30 has been described in detail with reference to FIG. 3.

The rotor 70 is preferably formed by press working. In addition, one side of the rotor 70 radially has a plurality of cooling fins (fin) that act to cool the heat generated in the stator 30 by blowing air toward the stator 30 when the rotor 70 rotates. It is formed by (放射 狀).

At this time, the individual cooling fins are formed to have a predetermined length in the radial direction of the rotor 70. In addition, the cooling fin is preferably bent at an angle of 90 ° to the rear wall surface by a lancing (lancing) process.

The motor 5 comprises a shaft 4 axially connected to the drum 3 through the tub 2. The shaft 4 transmits the driving force of the motor 5 to the drum 3. Since the rear end of the shaft 4 is coupled to the rotor 70, the rotational force of the rotor 70 may be transmitted to the drum 3.

In addition, the present invention provides a bearing (6b) 6b and a bearing housing (7) mounted to the rear of the tub (2) for supporting the shaft (4) and supporting the bearing (6b) (6b). Include.

The bearings 6b and 6b support the shaft 4 so that the shaft 4 can be smoothly rotated, while alleviating the impact when the shaft 4 rotates.

FIG. 5 is a detailed view of portion A of FIG. 2 and is a longitudinal cross-sectional view illustrating a structure of a driving unit according to a second exemplary embodiment of the present invention. FIG. 5 briefly illustrates a structure of a driving unit unlike FIG. 4.

Hereinafter, a second embodiment will be described with reference to FIG. 5 with a focus on differences from the first embodiment.

In the second embodiment, unlike the first embodiment, the fixing part 64 of the stator bracket 60 is fixed to the front surface of the stator 30. In addition, in the second embodiment, the insertion portion 62 of the stator bracket 60 is fixed to protrude toward the rear of the tub 2.

In this case, the coupling member 80 is mounted to the fastener 66 of the stator 30, the fastening hole 38 of the stator bracket 60, and the stator 30 in this order.

The drum washing machine described above functions as follows.

6 is a graph showing the experimental results according to the first embodiment of the present invention.

In FIG. 6, the rotation speed of the motor 5 was set to 1150 rpm, and the experiment was performed without applying a load to the motor 5. In addition, in order to compare the noise of the motor 5, the noise generated by the motor 5 was measured with the cover of the drum washing machine removed.

When the depth of the stator 30 is 27mm, the weight of the general stator 30 corresponds to about 4.2 kg. In FIG. 6, when the depth of the stator 30 corresponds to 27 mm, that is, the weight of the stator 30 is set to 4.2 kg.

As can be seen from the experimental value according to FIG. 6, when the stator bracket 60 was not mounted, noise of about 64.7 decibels (dB) was generated.

However, when the stator bracket 60 corresponding to 1.1 kg was mounted, noise of approximately 63.15 dB was generated. Therefore, when the stator bracket 60 corresponding to 1.1 kg was mounted, it was found that the noise was reduced compared to when the stator bracket 60 was not mounted.

When the stator bracket 60 corresponding to 2.3 kg is mounted, noise of approximately 60.25 dB is generated. In this case, it was found that the noise was reduced than when the stator bracket 60 corresponding to 1.1 kg was mounted.

Therefore, it can be seen that as the weight of the stator bracket 60 increases, the noise generated by the motor 5 decreases.

Noise can be thought of as being caused by vibrations generated from certain objects. Therefore, even if the vibration generated from the motor 5 is different from the reduction ratio of noise, the vibration may be reduced when the stator bracket 60 is mounted than when the stator bracket 60 is not mounted.

Therefore, in the present invention, the stator bracket 60 is added separately to reduce noise and vibration generated from the motor 5.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

1 is a longitudinal sectional view schematically showing a conventional drum washing machine configuration.

Figure 2 is a longitudinal sectional view schematically showing the drum washing machine configuration of the present invention.

3 is a perspective view showing a stator and a stator bracket according to the present invention.

4 is a detailed view of a portion A of FIG. 2, and is a longitudinal sectional view showing a structure of a driving unit according to the first embodiment of the present invention.

FIG. 5 is a detailed view of portion A of FIG. 2, and is a longitudinal sectional view showing a structure of a driving unit according to a second embodiment of the present invention; FIG.

6 is a graph showing the experimental results according to the first embodiment of the present invention.

<Description of Signs for Main Parts of Drawings>

2: tub 3: drum

30: stator 36: fastening portion

60: stator bracket 62: insertion portion

64: fixing part 66: fastener

80: coupling member

Claims (10)

Tub; An outer rotor type motor having a stator fixed to the rear of the tub and a rotor rotatable about the stator; And Drum washing machine comprising a; stator bracket is inserted into the inside of the stator. The method of claim 1, The stator is a drum washing machine, characterized in that made of an annular hollow. The method of claim 2, The stator bracket, An insertion part inserted into the hollow part; Drum washing machine comprising a fixing portion extending vertically from the insertion portion. The method of claim 3, The insertion unit drum washing machine, characterized in that the outer diameter is made smaller than the inner diameter of the hollow portion. The method of claim 3, The depth of the insert portion drum washing machine, characterized in that the same as the depth of the hollow portion. The method of claim 3, The fixing part drum washing machine, characterized in that formed in an annular extending radially from the insertion portion. The method of claim 3, The fixing unit is a drum washing machine, characterized in that the surface contact is fixed to the back of the stator. The method of claim 3, The fixing unit is a drum washing machine, characterized in that fixed to the front surface of the stator. The method according to claim 7 or 8, And a coupling member for fixing the fixing part to the stator. The method of claim 1, The stator bracket is a drum washing machine, characterized in that produced by the die (Die Castiong).

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