WO2005071155A1

WO2005071155A1 - Drum type washing machine

Info

Publication number: WO2005071155A1
Application number: PCT/JP2004/018386
Authority: WO
Inventors: Hisao Tatsumi; Hiroshi Nishimura; Tatsuo Ioku
Original assignee: Kabushiki Kaisha Toshiba; Toshiba Consumer Marketing Corporation; Toshiba Ha Products Co., Ltd.
Priority date: 2004-01-23
Filing date: 2004-12-09
Publication date: 2005-08-04
Also published as: US20070157677A1; KR20060114367A; JP4387812B2; TW200532068A; JP2005204969A; KR100790630B1; TWI260356B; CN1906348A

Abstract

A drum type washing machine comprising a water tank (10), a rotary tank (14) disposed in the water tank (10) and driven for rotation around a horizontal axis, a suspension (11) which elastically supports the water tank (10), and auxiliary baffles (23) which is disposed on the inner surface of the peripheral wall of the rotary tank (14) so that they are close to one of the axial end plates of the rotary tank (14) and away from the other and which extends along the axial direction of the rotary tank (14). The auxiliary baffles (23) are arranged to move the washing in the rotary tank (14) toward the vicinity of the center of gravity of the vibration-system members which impose loads on the suspension (11).

Description

Specification

Drum type washing machine

Technical field

The present invention relates to a drum type washing machine having a rotating tub that rotates around a horizontal axis.

Background art

[0002] A drum-type washing machine has a rotary tub that rotates about a substantially horizontal axis and a water tub that houses the rotary tub. An inner surface of a peripheral wall of the rotary tub is used to lift laundry. There are multiple knotles. In the washing and rinsing steps, the rotary tub is rotated at a low speed in a state where water is stored in the water tub and laundry is stored in the rotary tub. Thus, the operation of lifting the laundry in the rotating tub and then dropping the laundry is repeated, so that the laundry is beat-washed. In the spin-drying process, the rotating tub is rotated at a low speed to remove water contained in the laundry to some extent, and then the rotating speed of the rotating tub is gradually increased to the maximum speed. Thereby, the laundry is centrifugally dehydrated.

[0003] In a drum-type washing machine, if the laundry is displaced at the start of the washing operation due to, for example, the laundry being displaced into the rotating tub, the washing process proceeds in the deviated state. But there is a situation that is difficult to be solved. If there is an imbalance in the rotating tank, especially near both ends in the axial direction, large vibrations occur during the dewatering process. For this reason, in a conventional drum type washing machine, a liquid balancer is provided to suppress generation of large vibration and noise due to imbalance, and a rotating tub is operated at a low speed in an early stage of the dehydration process in order to correct the imbalance. They rotate forward and backward. However, even if the above-mentioned method is adopted, there is a problem that the washing capacity is large and vibration and noise cannot be sufficiently suppressed in a large drum type washing machine.

[0004] On the other hand, in Japanese Patent Laid-Open Publication No. 2002-315985 (JP-A-2002-31598), this is an imbalance in a drum type washing machine having a rotating tub that is inclined forward. In order to suppress the deterioration of the cleaning performance caused by this, a configuration has been proposed in which an auxiliary baffle is provided on the rear end plate of the rotating tub in addition to the noodle. If the rotating tub is inclined forward and upward, the laundry tends to lean toward the back. According to the above configuration, the washing that is present in the inner part of the rotating tank in a one-sided manner. Since the rinse can be sufficiently stirred, the occurrence of uneven washing can be suppressed. Patent Document 1: Japanese Patent Application Laid-Open No. 2002-315985

Disclosure of the invention

Problems to be solved by the invention

[0005] However, the above-mentioned auxiliary baffle is provided for the purpose of agitating the laundry in the inner part of the rotating tub which cannot be agitated by the conventional baffle. That is, even if the auxiliary baffle is provided, the washing operation is continued without removing the state in which the laundry is offset in the inner part of the rotating tub. For this reason, there was a problem that large vibrations and noises were easily generated during the dewatering process.

An object of the present invention is to provide a drum type washing machine capable of reducing generation of vibration and noise during a spin-drying step.

Means for solving the problem

[0006] The present invention relates to a drum type washing machine including a water tub, a rotary tub provided in the water tub, and driven to rotate around a horizontal axis, and elastic supporting means for elastically supporting the water tub. An auxiliary baffle is provided on the inner surface of the peripheral wall of the rotary tank. The auxiliary baffle extends along the axial direction of the rotary tub, and is provided on the inner surface of the peripheral wall of the rotary tub so as to be close to one of the axial end plates of the rotary tub and separated from the other. ing. With the aid of the auxiliary baffle, the laundry in the rotating tub is configured to be moved near the center of gravity of the vibration system member that applies a load to the elastic support means.

In this case, it is preferable that the auxiliary baffle be configured so as to include an inclined surface that is inclined toward the peripheral wall portion with the force of one end plate of the rotating tub facing the other end plate.

The invention's effect

[0007] In the drum type washing machine of the present invention, when the rotating tub is rotated during the washing operation, the laundry located at both axial ends of the rotating tub is moved to the vicinity of the center in the rotating tub by the action of the auxiliary baffle. Move. Therefore, it is possible to prevent the occurrence of imbalance at both ends in the axial direction of the rotating tub during the spin-drying step, thereby suppressing the occurrence of large vibration.

Brief Description of Drawings FIG. 1 is an external perspective view showing an overall configuration of a drum type washing machine showing one embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a drum-type washing machine.

[FIG. 3] FIG. 3 is a perspective view of a rotary tank with a drum lid omitted.

FIG. 4 is an enlarged perspective view of an auxiliary baffle.

FIG. 5 is a diagram for explaining the difference between the centrifugal force acting on the laundry located on the outer peripheral portion in the rotating tub and the centrifugal force acting on the laundry located on the inner peripheral portion.

[Fig. 6] Fig. 6 is a diagram for explaining the magnitude of the centrifugal force exerted on the laundry and the moment of inertia around the center of gravity.

FIG. 7 is a diagram showing a difference in cloth entanglement ratio at the end of drying depending on the presence or absence of an auxiliary baffle.

[FIG. 8] FIG. 8 is a view showing a difference in vibration generated during a dehydration step depending on the presence or absence of an auxiliary baffle and the size of the auxiliary baffle.

FIG. 9 is a diagram for explaining a difference in vibration amplitude due to a difference in height of the auxiliary baffle 23.

FIG. 10 is a diagram for explaining a difference in vibration amplitude due to a difference in axial length of the auxiliary baffle 23.

Explanation of symbols

[0009] 1 is a drum-type washing machine, 10 is a water tub, 11 is a suspension (elastic support means), 14 is a rotary tub, a 15-mm tub shaft, 20, 21, and 22 um main Knofle, and 23 umbo Hosuke Nohle , 23a, 23bi are shown.

BEST MODE FOR CARRYING OUT THE INVENTION

[0010] In order to explain the present invention in more detail, the present invention will be described with reference to the accompanying drawings.

1 to 10 show one embodiment of the present invention. This embodiment is applied to a top-open type drum type washing machine. As shown in FIGS. 1 and 2, the washing machine 1 includes a base plate 2, an outer box 3 fixed on the base plate 2, and a top cover 5 mounted on the outer box 3 and having a laundry entrance 4. Have been. The outer box 3 includes an outer box main body 6 and a front plate 7. The top cover 5 is provided with an outer lid 8 for opening and closing the laundry entrance 4. It is. The outer lid 8 is of a two-fold type including a front lid 8a and a rear lid 8a. At the right front of the top cover 5, an operation panel 9 is provided.

[0011] Inside the outer case 3, a substantially cylindrical water tank 10 is elastically supported via a plurality of suspensions 11 (corresponding to elastic support means). The suspension 11 includes a damper 11a and a suspension panel ib. An opening 13 which is opened and closed by an inner lid 12 is formed in an upper part of the water tank 10. When the opening 13 is closed by the inner lid 12, the space between the inner lid 12 and the opening 13 is sealed in a watertight manner.

[0012] Inside the water tank 10, a cylindrical rotary tank 14 is rotatably supported. The diameter of the rotary tank 14 is set to about 520 mm, and the length in the axial direction is set to about 400 mm. The rotary tub 14 functions as a washing tub, a dewatering tub, and a drying tub, and has a number of small holes (not shown) on its peripheral wall. Tank shafts 15 (shown only in FIG. 5) extending substantially in the horizontal direction are provided on the left and right end plates of the rotary tank 14, and these shafts 15 are provided on bearings provided on the left and right end plates of the water tank 10. (Not shown) so as to be rotatable. The tank shaft 15 extends in a substantially horizontal direction. A motor (not shown) is provided on a left end plate of the water tank 10, and a rotation shaft of the motor is connected to an end of a tank shaft 15 supported on the left end plate of the water tank 10. That is, the rotary tank 14 is directly driven to rotate by the motor. The point indicated by “0” in FIG. 2 indicates the center of the tank shaft 15 (that is, the rotation center axis of the rotary tank 14).

An opening 17 (see FIG. 3) that is opened and closed by a drum lid 16 is provided on a peripheral wall of the rotary tank 14. The drum lid 16 is composed of a lid main plate 18 that rotates around a rotation fulcrum 18a in FIG. 2, and an auxiliary plate 19 that rotates around a rotation fulcrum 19a. The lid main plate 18 and the auxiliary plate 19 are opened and closed in an interlocked manner by an interlocking mechanism (not shown). When the drum lid 16 is in a closed state (the state shown in FIG. 2), the lid The main plate 18 is configured so that the front ends thereof overlap. The closed state of the drum lid 16 is held by a lock means (not shown). The opening 17 is configured to face the opening 13 of the water tank 10 when the rotary tank 14 is stopped.

As shown in FIGS. 2 and 3, a plurality of, for example, three main baffles 20 to 22 having a substantially triangular cross section are provided on the inner surface of the peripheral wall of the rotary tub 14. Three main baffles 20—22 Are arranged at substantially equal intervals, of which two main baffles 20, 21 arranged on both sides of the opening 17 with the opening 17 interposed therebetween have lengths set to about 230 mm. ing. The length of one main baffle 22 disposed at a position facing the opening 17 with the rotation center of the rotary tub 14 interposed therebetween is set to about 320 mm. The height of the three main baffles 20-22 (the radial dimension of the rotary tank 14) is set to about 30 mm. The main baffles 20 to 22 are arranged close to the center in the axial direction of the peripheral wall portion so as to be almost the same distance from both end plates of the rotary tank 14. Although not shown, a counterweight for taking balance with the drum lid 16 is accommodated inside the main baffle 22 having a large length.

As shown in FIGS. 2 to 4, auxiliary baffles are respectively provided between the main baffle 20 and the main baffle 22 and between the main baffle 21 and the main baffle 22 on the inner surface of the peripheral wall of the rotary tank 14. Full 23 (first and second baffles) are provided for each pair. The auxiliary baffles 23 of each pair are disposed at both left and right ends of the inner surface of the peripheral wall so as to face the rotating tank 14 in the axial direction. Each auxiliary baffle 23 is in contact with the left end plate or the right end plate of the rotary tub 14, and is fixed to the peripheral wall by screws. The auxiliary baffle 23 has a substantially triangular pyramid shape in which the end plate force of the rotary tub 14 also tapers toward the vicinity of the axial center of the peripheral wall portion. Also, the auxiliary field descending 23 has a narrow inclined surface 23a in which one of the two end plates of the rotary tub 14 also inclines toward the peripheral wall side toward the other, and a circumferential force is applied from the inclined surface 23a toward the peripheral wall. It has a triangular inclined surface 23b that is inclined on both sides.

As shown in FIG. 4, the height of the portion of the auxiliary baffle 23 that comes into contact with the end plate of the rotary tub 14 (the length in the radial direction of the rotary tub 14) is HI (see FIG. 4). Then, the height dimension HI is set to about 65 mm. When the length of the auxiliary baffle 23 in the peripheral wall of the rotary tank 14 is H2, the length H2 is set to about 100 mm.

An opening (not shown) is formed between the auxiliary baffle 23 and the main baffle 22 on the inner surface of the peripheral wall of the rotary tub 14. The opening is for collecting laundry that has entered between the rotating tub 14 and the water tub 10, and is closed by a cover 25.

Although not shown in detail, the outer box 3 has a water supply device for supplying water into the water tank 10, a drainage device for discharging water from the water tank 10, and dehumidification of air in the rotary tank 14. And A drying device and the like for drying the laundry by warming it and returning it to the rotating tub 14 are provided.

In this embodiment, among the members constituting the drum type washing machine 1, the center of gravity of the water tank 10 and the rotating tank 14 that apply a load to the suspension 11, and the vibration system member that also generates a force such as a motor is positioned in the axial direction of the rotating tank 14. It is configured to be centrally located.

Next, the operation of the above configuration will be described. The entire operation of the drum-type washing machine 1 is controlled by a control microcomputer (not shown) contained in the outer box 3! / ヽ. When laundry is stored in the rotating tub and an instruction to start operation is given, the control microcomputer executes each process according to a preset operation course. For example, when the washing operation is started with the standard operation course set, the control microcomputer sequentially executes a washing step, a rinsing step, a dehydrating step, and a drying step.

[0019] Specifically, in the washing, washing and rinsing steps, the control microcomputer drives the water supply device to supply the washing water to a predetermined water level in the water tub 10, and then drives the motor to rotate the rotating tub 14. Is rotated at low speed in the forward and reverse directions. Note that the control microcomputer controls the motor so that the opening 17 faces the opening 13 of the water tank 10 when the rotating tank 14 is stopped. By rotating the rotating tub 14 forward and backward at a low speed, the laundry stored in the rotating tub 14 is repeatedly lifted by the main baffles 20-22 together with the water in the water tub 10 and then dropped. It is washed and rinsed. In this case, the action of lifting the laundry by the triangular pyramid-shaped auxiliary baffle 23 is smaller than that of the main baffle 20--22 because the laundry contains water and is heavy, but the auxiliary baffle 23 causes the rotating tub 14 to rotate. The laundry located at both ends in the axial direction can be moved to the vicinity of the main baffle 20-22. In addition, the laundry located at both ends in the axial direction of the rotating tub 14 is moved by the auxiliary baffle 23 to the vicinity of the main baffles 20 to 22 so that a mechanical force is applied (push washing), so that the washing performance is improved. Improve

In the dehydration step, after the control microcomputer drives the drainage device to discharge the water in the water tank 10, it drives the motor to rotate the rotary tank 14 in one direction at a low speed of about 40 rpm. The laundry that has become heavy and contains a large amount of water at the end of drainage is located in the lower part of the rotating tub 14. Therefore, when the rotating tub 14 is rotated at a low speed, the laundry is held by the main baffles 20-22. After being lifted, the operation of falling is repeated. As a result, water contained in the laundry is removed to some extent.

Subsequently, the control microcomputer drives the motor to rotate the rotating tank 14 in one direction at a rotation speed of about 60 to 80 rpm. At this time, the laundry in the rotating tub 14 is moved in the rotating tub 14 by the main baffles 20-22 and the auxiliary knotles 23, and is uniformly attached to the entire peripheral wall.

That is, the laundry located near the center in the axial direction in the rotating tub 14 is a force that is lifted by the main baffles 20 to 22. The laundry sticks to the peripheral wall and falls due to the magnitude of the centrifugal force acting on the laundry. Divided into

FIG. 5 is a diagram for explaining the centrifugal force acting on the laundry S in the rotating tub 14. In Fig. 5, the distance from the center of rotation O of the rotating tub 14 to the center of gravity of the laundry S is:!, The mass of the laundry S is m, and the rotational angular velocity is ω, the centrifugal force acting on the laundry S F is defined as follows.

F = m-r- ω "'{lj

As shown in the above equation (1), the centrifugal force F is proportional to the distance r. For example, as shown in FIG. 6, when a large number of laundry items S exist in the rotating tub 14, the distance rl between the center of gravity of the laundry item S1 located at the outer peripheral portion and the rotation center axis O is rl The distance between the center of gravity of the laundry S2 located and the rotation center axis O is larger than r2 (rl> r2). Therefore, the centrifugal force acting on the laundry S1 is larger than the centrifugal force acting on the laundry S2. Therefore, of the laundry picked up by the main baffles 20-22, the laundry located on the outer periphery is stuck to the peripheral wall without falling, and the laundry located on the inner periphery is dropped. Become. As a result, the laundry in the rotating tub 14 is gradually dispersed and adheres uniformly to the entire peripheral wall.

On the other hand, the laundry located on both sides in the axial direction of the rotating tub 14 is lifted by the auxiliary baffle 23 because the laundry is lightened by removing moisture. At this time, since the auxiliary buffer 23 has a triangular pyramid shape, the laundry is positioned near the axial center of the rotary tub 14 by the inclined surface 23a, and is rotated by the inclined surface 23b from both sides in the circumferential direction of the auxiliary noodle 23. Direction Moved near the center. As a result, the laundry is collected near the axial center of the rotating tub 14. The laundry collected near the center of the rotating tub in the axial direction is the main baffle 20-22 described above. It is evenly attached to the inner surface of the peripheral wall of the rotary tank 14 depending on the application.

[0024] In this way, the laundry in the rotating tub 14 is gradually dispersed over the entire inner surface of the peripheral wall, and the imbalance is reduced. By the above-described operation, the amount of laundry existing near the center in the axial direction of the rotary tub 14 becomes larger than the amount of laundry existing near both ends (near the end plate).

When the control microcomputer determines that the laundry has uniformly adhered to the peripheral wall of the rotating tub 14, it drives the motor to increase the rotation speed of the rotating tub 14 to about 100 rpm. The determination as to whether or not the force that the laundry has uniformly adhered to the peripheral wall of the rotating tub is made, for example, by detecting a change in the rotation speed of the motor during one rotation of the rotating tub (that is, uneven rotation). This rotation speed (100 rpm) is set to a rotation speed at which the centrifugal force applied to all the laundry in the rotating tub 14 exceeds the gravitational acceleration. Therefore, here, the rotary tub 14 rotates with all the laundry in the rotary tub 14 adhered to the peripheral wall portion.

Thereafter, the control microcomputer drives the motor to raise the rotating tank 14 to a maximum speed of 900 to 1200 rpm. As a result, the laundry rotates together with the rotary tub 14 while being attached to the inner surface of the peripheral wall of the rotary tub 14, and is centrifugally dehydrated. If a large vibration is generated at a plurality of resonance points appearing while increasing the rotation speed of the rotating tub 14 to the maximum speed of the lOOrpm, the control microcomputer reduces the rotating speed to reduce the laundry in the rotating tub 14. To perform an operation to correct the imbalance that is causing the resonance vibration. Then, after correcting the imbalance, the rotation speed of the rotary tank 14 is increased again to the maximum speed.

Here, the vibration generated during dehydration will be described with reference to FIG. The magnitude of the vibration generated during dehydration is determined by the excitation force. The magnitude of the excitation force is determined by the centrifugal force applied to the laundry S and the moment of inertia around the center of gravity acting on the laundry S. The moment of inertia M is defined as follows, where G is a plane passing through the center of gravity of the vibration system and orthogonal to the rotation center axis O, and L is the distance from the plane G to the center of gravity of the laundry S.

M = F'L = m'r 'co ² ' L

As described above, F is the centrifugal force acting on the laundry. As shown in the above equation (2), the moment of inertia M is proportional to the distance r and the distance L. Further, as described above, the centrifugal force F is proportional to the distance r. Therefore, it is caused by the imbalance existing near the axial center of the rotary tank 14. The vibration caused by the unbalance existing at both ends in the axial direction in the rotary tank 14 is smaller by J / J.

[0028] In the present embodiment, since the laundry is brought near the axial center of the rotating tub 14, imbalance exists near the axial center of the rotating tub 14, that is, near the center of gravity of the vibration system. Therefore, compared to a conventional drum-type washing machine in which imbalance occurs at the axial end of the rotary tub, the vibration generated during the spin-drying process can be reduced.

In the drying step, the control microcomputer drives the motor to rotate the rotary tub 14 at low speed in the forward and reverse directions, and also drives the drying device. As a result, the warmed air is supplied into the rotating tub 14 to remove moisture contained in the laundry. The air from which moisture has been removed is dehumidified, warmed, and returned to the rotating tank 14 again. The laundry in the rotating tub 14 is dried by the circulation of the air.

Further, when the rotating tub 14 is rotated at a low speed in the forward and reverse directions, the laundry in the rotating tub 14 is lifted by the main baffles 20-22, and is heated by the hot air flowing through the rotating tub 14. Spreads into 14 and falls. Further, the auxiliary baffle 23 moves the laundry that has spread and fallen into the rotating tub 14 to a position near the axial center of the rotating tub 14. That is, the laundry in the rotating tub 14 moves in the rotating tub 14 while being dispersed or concentrated. Therefore, the warm air flowing through the rotating tub 14 and the laundry come into efficient contact with each other, and the drying efficiency is improved.

[0031] Further, according to the experiment of the inventor, the laundry is agitated by the main baffle 20-22 and the auxiliary baffle 23, so that the laundry is less likely to be twisted or entangled at the end of drying. It turned out to be.

FIG. 7 shows a drum type washing machine having a main baffle 20-22 and an auxiliary baffle 23 (indicated by P in FIG. 7) and a drum type washing machine having only the main baffle 20-22 (indicated by Q in FIG. 7). 5) is a bar graph comparing the cloth entanglement ratio at the end of drying in ()). In FIG. 7, the horizontal axis indicates the laundry amount, and the vertical axis indicates the cloth entanglement ratio.

[0033] The cloth entanglement rate T (%) is obtained from the following equation.

T = {(Tl-TO) / TO} X 100

In the above formula, TO and T1 represent one piece of laundry (composed of a plurality of bleached cotton fabrics) before and after the washing operation in accordance with the rhythm of the metronome. It shows the average time (seconds) required to remove all the laundry when 14 rotators were removed at a time.

As is clear from FIG. 7, the drum-type washing machine having the auxiliary baffle 23 has a lower cloth entanglement rate than the drum-type washing machine having no auxiliary baffle 23.

According to this embodiment, the following effects can be obtained. That is, by providing the auxiliary baffle 23 in the rotary tub 14, the laundry in the rotary tub 14 can be moved near the axial center, in other words, near the center of gravity of the vibration system during the spin-drying process. Therefore, generation of vibration and noise during the dehydration step can be suppressed. Further, the laundry located at both axial ends of the rotary tub 14 can be efficiently moved to the vicinity of the center in the axial direction by the auxiliary baffle 23, so that the operation time for correcting imbalance can be reduced. .

[0035] In the drying step, the washing material moves in the rotary tank 14 while repeating dispersion and concentration by cooperation of the main baffle 20-22 and the auxiliary baffle 23. Particularly, in this embodiment, the main baffle 20-22 and the auxiliary baffle 23 are separated from each other, so that the main baffle 20-22 and the auxiliary baffle 23 can efficiently move the laundry in cooperation with each other. For this reason, the drying efficiency can be improved, and the cloth entanglement of the laundry can be reduced. Further, according to experiments by the inventors, the amount of screen generated on the laundry at the end of drying is smaller in the drum type washing machine having the auxiliary baffle 23 than in the drum type washing machine having no holding baffle 23. Less was observed. This is due to the small cloth entanglement rate during the drying process. Therefore, according to the present embodiment, there is also obtained an effect that the laundry can be finished in a good condition.

FIG. 8 shows the results of an experiment performed by the inventors on the difference in the amplitude of vibration generated during dehydration depending on the presence or absence of the auxiliary baffle 23 and the size of the auxiliary baffle 23. In FIG. 8, the horizontal axis represents the amount of laundry (kg), and the vertical axis represents the amplitude of vibration (mm). In FIG. 8, broken lines P1 to P4 indicate a drum type washing machine having a main baffle 20-22 and an auxiliary baffle 23, and a broken line Q indicates a drum type washing machine having only a main baffle 20-22. / ヽFurther, the combinations of the lengths (HI, H2) (see FIG. 4) of the auxiliary baffles of the drum type washing machine corresponding to the polygonal lines P1 to P4 are (60 mm, 40 mm), (60 mm, 65 mm), (100 mm, 40mm) and (100mm, 65mm). As is apparent from FIG. 8, the drum type washing machine having the main baffle 20-22 and the auxiliary baffle 23 has a lower vibration than that of the drum type washing machine having only the main baffle 20-22. The amplitude is small. Further, among the drum type washing machines having the auxiliary baffle 23, the amplitude of the drum type washing machine indicated by the broken line P4, that is, the drum type washing machine having the auxiliary baffle 23 according to the present embodiment, is the smallest. Therefore, in the present embodiment, the vibration generated during dehydration can be significantly reduced.

[0038] The present invention is not limited to the above embodiment, and the following modifications are possible.

The height dimension (HI) and the axial length dimension (H2) of the auxiliary baffle 23 are not limited to the dimensions shown in the above embodiment. FIGS. 9 and 10 are diagrams for examining the difference in vibration amplitude due to the difference in height of the auxiliary baffle 23 and the difference in vibration amplitude due to the difference in the axial length of the auxiliary baffle 23. 7 is a graph created based on the experimental results shown in FIG.

[0039] That is, Fig. 9 is created based on the experimental results (corresponding to the broken lines P1 and P2 in Fig. 8) of the drum type washing machine having the auxiliary baffle 23 having the same axial length (60mm) and different heights. It was done. The horizontal axis in Fig. 9 indicates the height (mm) of the auxiliary baffle 23, and the vertical axis indicates the amount of reduction (mm) relative to the amplitude of the drum type washing machine (corresponding to the polygonal line Q in Fig. 8) without the auxiliary baffle Is shown. Fig. 10 is based on the experimental results (corresponding to the broken lines P1 and P3 in Fig. 8) of a drum-type washing machine having auxiliary baffles 23 with the same height (40mmm) and different axial dimensions. . The horizontal axis in FIG. 10 indicates the axial length (mm) of the auxiliary baffle 23, and the vertical axis indicates the reduction amount (mm) with respect to the amplitude of the drum type washing machine without the auxiliary baffle. Further, the polygonal lines K1 to K4 in FIGS. 9 and 10 are created based on the data when the laundry amount is 1 kg, 3 kg, 5 kg, and 8 kg.

As is clear from FIGS. 9 and 10, the vibration reduction amount increases as the height of the auxiliary baffle 23 increases and as the length in the axial direction increases. In general, considering that the vibration amplitude generated during the dehydration step has a variation of about 0.5 mm, the vibration reduction effect becomes significant when the vibration reduction amount exceeds 0.5 mm. Therefore, the size of the auxiliary baffle with a vibration reduction of 0.5 mm or more in at least two of the four types of laundry in the experiment was about 30 mm or more in height and about 50 mm in axial length. That is all. [0041] The height dimension of the auxiliary baffle affects the action of lifting the laundry, and is related to the thickness dimension of the laundry. Therefore, since the general thickness of the laundry is about 30 mm, the height of the auxiliary baffle is preferably 30 mm or more.

[0042] The axial length dimension of the auxiliary baffle affects the action of moving the laundry located at the axial end of the rotary tub to near the center of gravity of the vibration system, and the axial length of the rotary tub. It is related to the size and the distance from the end of the rotating tank to the center of gravity of the vibration system. In the above embodiment, since the axial length of the rotary tub 14 is 400 mm and the end plate force of the rotary tub 14 is 2 OO mm from the center of gravity, the axial direction of the auxiliary baffle 23 can provide a significant vibration reduction effect. The length is one-eighth or more of the axial length of the rotary tank 14, and the end plate force is one-fourth or more of the distance to the center of gravity. However, the auxiliary baffle 23 needs to be arranged in the area from the end plate of the rotary tank to the surface G (see FIG. 5) on the inner surface of the peripheral wall of the rotary tank.

[0043] Further, the auxiliary baffles provided on both axial sides of the rotary tub may not face each other.

Further, the auxiliary baffle need not be in contact with the end plate as long as it is provided on the peripheral wall so as to be close to the end plate of the rotary tank.

In a drum-type washing machine in which the rotation center axis of the rotating tub is inclined upward, the laundry in the rotating tub is turned only at the front of the peripheral wall of the rotating tub in order to bias the laundry in the rotating tub toward the back (rear). It is preferable to provide an auxiliary baffle close to the front end plate of the transfer tank.

[0044] In a drum type washing machine in which the center of gravity of the vibration system member is shifted in the axial center force of the rotary tub, it is preferable that the pair of auxiliary baffles facing in the axial direction have different axial lengths. That is, when the center of gravity is located on one side of the axial center of the rotary tank, the auxiliary baffle disposed on one side in the axial direction of the peripheral wall portion is longer than the auxiliary baffle disposed on the other side in the axial direction. It is better to reduce the size. However, each auxiliary baffle must be located in the area between the plane G passing through the center of gravity and the end plate.

[0045] The auxiliary baffle may be formed by press-molding a peripheral wall portion or an end plate of the rotary tank. According to the above configuration, the auxiliary baffle and the rotary tub can be integrally formed, and the number of assembling steps can be reduced.

The auxiliary baffle is not limited to a triangular pyramid shape, and may be, for example, a semi-conical shape.

The present invention can also be applied to a drum type washing machine having a laundry entrance at the front. in this case In the above, an auxiliary baffle which is close to the front end plate of the rotary tub may be provided only at the front of the peripheral wall of the rotary tub. The rotating tank having an opening on the front rotates around a rotating shaft provided at the rear. For this reason, when the laundry is collected at the front part in the rotating tub, the vibration of the rotating tub increases and a large moment is applied to the rotating shaft and the bearing. On the other hand, if the auxiliary baffle is provided at the front of the peripheral wall of the rotating tub, it is possible to prevent the laundry from being concentrated on the front of the rotating tub, thereby suppressing the occurrence of vibration.

Industrial applicability

As described above, the drum type washing machine according to the present invention can suppress the occurrence of vibration, and is therefore useful as a general household washing machine used in a quiet environment.

Claims

The scope of the claims

[1] an aquarium (10),

A drum type washing machine comprising: a rotary tub (14) provided in the water tub (10) and driven to rotate around a horizontal axis; and elastic support means (11) for elastically supporting the water tub (10). ,

The rotary tub (14) is provided on the inner surface of the peripheral wall of the rotary tub (14) so as to be close to one of the axial end plates and apart from the other, and along the axial direction of the rotary tub (14). With an extended auxiliary baffle (23),

The auxiliary baffle (23) is configured to move the laundry in the rotating tub (14) to near the center of gravity of a vibration system member that applies a load to the elastic support means (11). A drum type washing machine characterized by the following.

[2] The drum-type washing machine according to claim 1,

The auxiliary baffle (23) has an inclined surface (23b) that is inclined from one end plate side of the rotary tub (14) toward the other end plate side toward the peripheral wall side. I do.

[3] The drum-type washing machine according to claim 1,

The rotation axis of the rotary tank is constituted by an inclined axis in which one of both ends is located slightly above the other,

The auxiliary baffle is provided on an inner surface of a peripheral wall portion of the rotary tub so as to approach an upper end plate of both end plates of the rotary tub.

[4] The drum-type washing machine according to claim 1,

The auxiliary baffle (23) is composed of a first baffle near one of both end plates of the rotary tub (14) and a second baffle near the other end plate,

It is characterized in that the first and second baffles are arranged to face each other in the axial direction of the rotary tank.

[5] The drum-type washing machine according to claim 4,

The vibration system member is configured such that its center of gravity is shifted to one end plate side from the axial center of the rotary tank,

The second baffle is larger than the first baffle. Sign.

[6] The drum-type washing machine according to claim 1,

A main baffle (20, 21, 22) provided at the axial center of the inner surface of the peripheral wall of the rotary tub and extending along the axial direction of the rotary tub;

The position of the auxiliary baffle (23) in the circumferential direction of the rotating tub (14) is different from the position of the main baffle (20, 21, 22) in the circumferential direction of the rotating tub (14). It is characterized by having.

[7] The drum-type washing machine according to claim 6,

The auxiliary baffle (23) and the main baffle (20, 21, 22) are arranged so as to be separated from each other in the circumferential direction of the rotary tub (14).

[8] The drum-type washing machine according to claim 1,

The auxiliary baffle (23) is characterized in that one end plate side force is also tapered toward the other end plate side.

[9] The drum-type washing machine according to claim 1,

The length of the auxiliary baffle (23) along the radial direction of the rotary tub is set to 30 mm or more, and the length is set to! / Mm.

[10] The drum-type washing machine according to claim 1,

In the auxiliary baffle (23), one end plate force of the peripheral wall portion of the rotary tank (14) is also arranged in a region up to the center of gravity of the vibration system member, and the rotation of the auxiliary baffle (23) The length of the tank (14) along the axial direction is set to one-eighth or more of the axial length of the rotary tank (14).