JP6997004B2 - Drum type washing machine - Google Patents

Drum type washing machine Download PDF

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JP6997004B2
JP6997004B2 JP2018031505A JP2018031505A JP6997004B2 JP 6997004 B2 JP6997004 B2 JP 6997004B2 JP 2018031505 A JP2018031505 A JP 2018031505A JP 2018031505 A JP2018031505 A JP 2018031505A JP 6997004 B2 JP6997004 B2 JP 6997004B2
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drum
dampers
washing machine
damper
type washing
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JP2019146618A (en
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真 井村
真理 黒澤
和幸 山口
龍之介 山口
卓也 立山
努 和田
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Hitachi Global Life Solutions Inc
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Hitachi Global Life Solutions Inc
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    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F23/00Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry 
    • D06F23/06Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry  and rotating or oscillating about an inclined axis
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/20Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)

Description

本発明は,ドラム式洗濯機に関するものである。 The present invention relates to a drum type washing machine.

近年では,毛布を例とする比較的大物の布類を洗濯したいというニーズも高まっている。このため,洗濯機の大容量化が進んでいる。その大容量化に向けて,ひとつの技術課題になるのが,運転時の振動の抑制である。 In recent years, there has been an increasing need to wash relatively large cloths such as blankets. For this reason, the capacity of washing machines is increasing. One of the technical issues to increase the capacity is to suppress vibration during operation.

ドラム式洗濯機は,例えば,特許文献1のような構造である。洗濯槽の下部に複数のダンパーを有し,その減衰性能はもちろん,配置を適切にすることで,振動を抑制している。布類を収めて回転するドラムは,洗濯槽の中に回転自在なように配置される。洗濯槽の外面の背面側には,ドラムを回転させる駆動モーターが取り付けられている。洗濯槽は,複数のばねやダンパーを介して,筺体の中およびベースの上に接続される。その姿勢を保持しつつ,運転時の自身の振動が筺体やベースに伝達しづらいようになっている。その前面には,布類を出し入れするための開口部が設けられている。その開口部の周辺では,筐体と洗濯槽がゴムベローズを介して接続されており,筐体に開閉可能なドアが設けられている。洗濯槽には,運転中の振動を計測するセンサーが設置されている。このセンサーで検知した振動データをもとに,ドラムの中の布類の偏り量や偏り方が判別される。振動が過剰に大きい場合,ドラムの回転速度を降下させる。その後,ふたたび回転速度を上げ下げして偏り量や偏り方を調整し,振動を抑制する制御を行う。 The drum type washing machine has a structure as shown in Patent Document 1, for example. It has multiple dampers at the bottom of the washing tub, and its damping performance as well as proper placement suppresses vibration. The rotating drum that houses the cloth is rotatably arranged in the washing tub. A drive motor that rotates the drum is attached to the back side of the outer surface of the washing tub. The washing tub is connected in the housing and on the base via multiple springs and dampers. While maintaining that posture, it is difficult for its own vibration during driving to be transmitted to the housing and base. An opening for putting in and taking out cloth is provided on the front surface. Around the opening, the housing and the washing tub are connected via rubber bellows, and the housing is provided with a door that can be opened and closed. A sensor that measures vibration during operation is installed in the washing tub. Based on the vibration data detected by this sensor, the amount and method of bias of the cloth in the drum are determined. If the vibration is excessively large, the rotation speed of the drum is reduced. After that, the rotation speed is increased or decreased again to adjust the amount of bias and the way of bias, and control is performed to suppress vibration.

このように,構造と制御の技術を組み合わせて,振動を抑制させている。 In this way, vibration is suppressed by combining structure and control technology.

特許第6111426号公報Japanese Patent No. 6111426

洗濯機の大容量化の課題のひとつとして,振動抑制を挙げた。大容量化にともない,布類の偏り量も大きくなるが,偏り方の違いによる影響も顕著になる。大物布類など布量が多い場合,ドラムの前面側あるいは中央付近に布類の偏りが形成される。これに対し,例として足拭きマットなどの一枚物,布量が少ない場合は,ドラムの背面側に偏る。 Vibration suppression was mentioned as one of the issues for increasing the capacity of washing machines. As the capacity increases, the amount of bias in the cloth increases, but the effect of the difference in the bias also becomes significant. When the amount of cloth is large, such as large cloth, the cloth is biased on the front side or near the center of the drum. On the other hand, for example, if the amount of cloth is small, such as a single piece such as a foot-wiping mat, it will be biased toward the back side of the drum.

運転時に,ドラムの前面側あるいは中央付近に偏りが形成される場合,洗濯槽は前面側の振動が背面側よりも大きくなる。背面側を起点に首振り運動し,つまり,回転運動のように揺れる。一方で,背面側に偏りがある場合,洗濯槽は背面側の振動が大きくなりやすい。しかし,前面側にあるゴムベローズによる減衰効果もあって,首振りのような回転運動とは異なり,洗濯槽全体が並進運動のように揺れる。 If a bias is formed on the front side or near the center of the drum during operation, the vibration on the front side of the washing tub becomes larger than that on the back side. It swings from the back side as a starting point, that is, it swings like a rotary motion. On the other hand, if there is a bias on the back side, the washing tub tends to vibrate on the back side. However, due to the damping effect of the rubber bellows on the front side, the entire washing tub sways like a translational motion, unlike a rotary motion such as a swing.

運転時,上記の並進運動のような揺れ方をする共振点や回転運動のような揺れ方をする共振点を必ず通過する。特に,布類の脱水をする場合には,これらの共振点を通過した後の十分高い回転速度にて,一定時間動作し,布類が含んだ水分を取り除く。 During operation, it always passes through the resonance point that sways like the above translational motion and the resonance point that sways like the rotational motion. In particular, when dehydrating cloth, it operates at a sufficiently high rotation speed after passing through these resonance points for a certain period of time to remove the water contained in the cloth.

それらの共振点は,洗濯槽とこれを支える複数のばねとダンパーからなる振動系の固有振動数に相当する。運転時の回転速度,つまり,回転周波数とその固有振動数がおおむね一致すると,共振状態が発生する。特に,固有振動の揺れ方と偏り方が一致したときに,共振が顕著になる。 These resonance points correspond to the natural frequencies of the washing tub and the vibration system consisting of a plurality of springs and dampers that support the washing tub. A resonance state occurs when the rotation speed during operation, that is, the rotation frequency and its natural frequency generally match. In particular, resonance becomes remarkable when the way of shaking and the way of bias of the natural vibration match.

並進運動のような揺れ方をする共振点を通過する際に,ドラムの背面側に布類が偏っていれば,共振に近い状態になり,振動が顕著に大きくなる。前面側あるいは中央付近に布類が偏っていれば,振動はそれほど大きくならない。一方で,回転運動のような揺れ方をする共振点を通過する際には,ドラムの前面側あるいは中央付近に布類が偏っていれば,振動が顕著に大きくなる。背面側に偏っていれば,振動はそれほど大きくならない。 If the cloth is biased toward the back side of the drum when passing through a resonance point that sways like a translational motion, the state is close to resonance and the vibration becomes significantly large. If the cloth is biased toward the front side or near the center, the vibration will not be so large. On the other hand, when passing through a resonance point that sways like a rotary motion, if the cloth is biased toward the front side or the center of the drum, the vibration becomes significantly large. If it is biased toward the back side, the vibration will not be so large.

並進運動のような単純な揺れ方をする共振点は,回転運動のような複雑な揺れ方をする共振点よりも低くなる。つまり,回転運動のような複雑な揺れ方をする共振点の方が,回転速度が速い分,加振力である遠心力も相対的に大きくなる。 Resonance points with simple swings such as translational motion are lower than resonance points with complex swings such as rotational motion. In other words, at the resonance point that sways in a complicated manner such as rotational motion, the centrifugal force, which is the exciting force, is relatively large because the rotational speed is faster.

特許文献1では,洗濯機の大容量化も狙って,布量が多い場合や大物布類を洗濯する場合に特化したと思われる振動抑制の手段を示している。 Patent Document 1 shows a vibration suppressing means that seems to be specialized when the amount of cloth is large or when washing large cloths, aiming at increasing the capacity of the washing machine.

洗濯機の側面視にて,前面側に配置したダンパーの減衰性能を,背面側に配置したダンパーの減衰性能よりも大きくする手段をとっている。ここで,前面側に配置したダンパーは,前面側の振動を減衰させるのに有効であり,これに対して,背面側に配置したダンパーは,背面側の振動を減衰させるのに有効になる。この手段は,相対的に,加振力が大きく,前面側が大きく揺れる,回転運動のような揺れ方をする共振点を通過するときの振動を抑制できる。 From the side view of the washing machine, the damping performance of the damper arranged on the front side is made larger than the damping performance of the damper arranged on the back side. Here, the damper arranged on the front side is effective for attenuating the vibration on the front side, whereas the damper arranged on the back side is effective for attenuating the vibration on the back side. This means can suppress the vibration when passing through the resonance point where the exciting force is relatively large, the front side sways greatly, and the swaying motion such as rotational motion occurs.

しかし,これでは,布量の少ない場合,並進運動のような揺れ方をする共振点を通過するときの振動が相対的に顕著になる傾向になる。この対策として,背面側のダンパーの減衰も大きくするということも考えられる。 However, in this case, when the amount of cloth is small, the vibration when passing through the resonance point that sways like a translational motion tends to be relatively remarkable. As a countermeasure, it is conceivable to increase the damping of the damper on the back side.

ところで,洗濯機の振動を考える上で,洗濯槽の振動の他に,その振動の伝達によって生じる床の振動も考慮する必要がある。洗濯槽に起因する共振点を通過した後,十分高い回転速度にて,定常回転する。このような,共振点通過時と定常回転時では,床への振動伝達という点で,ダンパーは相反する作用をする。つまり,ダンパーの減衰性能が大きいほど,共振点通過時の床への振動伝達は小さくなるが,一方で,定常回転時の床への振動伝達は大きくなってしまう。 By the way, when considering the vibration of the washing machine, it is necessary to consider not only the vibration of the washing tub but also the vibration of the floor caused by the transmission of the vibration. After passing through the resonance point caused by the washing tub, it rotates steadily at a sufficiently high rotation speed. When passing through the resonance point and during steady rotation, the damper acts in opposition in terms of vibration transmission to the floor. That is, the larger the damping performance of the damper, the smaller the vibration transmission to the floor when passing through the resonance point, but on the other hand, the larger the vibration transmission to the floor during steady rotation.

よって,前面側と背面側に配置したダンパーの減衰性能をいずれも一律大きくすると,いずれの共振点通過時も振動を抑制できるが,その後の定常回転時の床の振動が大きくなる,という相反する課題が生じてしまう。 Therefore, if the damping performance of the dampers placed on the front side and the back side are both uniformly increased, the vibration can be suppressed when passing through any resonance point, but the vibration of the floor during the subsequent steady rotation becomes large, which is a contradictory factor. Challenges arise.

本発明はこのような従来の課題を解決する。まず,前面側と背面側に配置したダンパーとで,上記した共振点に対する振動減衰効果が異なることに着目した。また,ドラムの前面側あるいは中央付近に偏りができる布量の多い場合は,布量の少ない場合に比べて,偏り方を調整しやすいという性質がある。さらに,回転速度が上昇するにつれて,布類の水分は掃けていき,偏り量も減っていく。運転中に,それらの点を洗濯槽に設置したセンサーで検知できることにも着目した。 The present invention solves such a conventional problem. First, we focused on the difference in the vibration damping effect on the resonance point described above between the dampers placed on the front side and the back side. In addition, when the amount of cloth that can be biased is large on the front side or near the center of the drum, it is easier to adjust the bias than when the amount of cloth is small. Furthermore, as the rotation speed increases, the water content of the cloth is swept away and the amount of bias decreases. We also paid attention to the fact that these points can be detected by the sensor installed in the washing tub during operation.

これらのことを考慮し,複数のダンパーを適切に配置し,それらの減衰性能を適切に設定することにより,容量や布類の偏り方によらずに,低振動なドラム式洗濯機を提供できる。 Taking these things into consideration, by appropriately arranging multiple dampers and appropriately setting their damping performance, it is possible to provide a drum-type washing machine with low vibration regardless of the capacity or unevenness of the cloth. ..

本発明のドラム式洗濯機は、布類を収めた状態で回転するドラムと,前記ドラムを回転自在に内包する外槽と,前記ドラムと前記外槽とを含む洗濯槽の下部に設けられた複数のダンパーと,前記洗濯槽と複数のダンパーを内包した筺体およびベースと,を備え、前記外槽は、槽カバーと水槽で構成され、前記槽カバーと前記水槽は分割面で分割可能であって、前記分割面は、前記外槽の前後方向の中心よりも前面側に設けられており、前記複数のダンパーは,前記分割面より後方に設置された一対のダンパーと,前記一対のダンパーの後方に設置されたダンパーと、を有し, 前記一対のダンパーいずれの減衰性能よりも,前記一対のダンパーの後方に設置されたダンパーの減衰性能が大きいことを特徴とする。
The drum-type washing machine of the present invention is provided at the lower part of a washing tub including a drum that rotates while containing cloth, an outer tub that rotatably contains the drum, and the drum and the outer tub. The outer tub is composed of a tub cover and a water tub, and the tub cover and the water tub can be divided by a dividing surface. The divided surface is provided on the front side of the center of the outer tank in the front-rear direction, and the plurality of dampers are a pair of dampers installed behind the divided surface and the pair of dampers. It has a damper installed at the rear , and is characterized in that the damping performance of the damper installed behind the pair of dampers is larger than the damping performance of any of the pair of dampers.

本発明によれば,複数のダンパーの減衰性能をすべて大きくすることなく,回転運動のような揺れ方の共振点と並進運動のような揺れ方の共振点,いずれも振動を抑制できる。これに加えて,共振点通過時の振動抑制とその後の定常回転時の床の振動抑制を両立する効果がある。洗濯機の大容量化を図る場合に,布類の偏り量や偏り方によらず,低振動性を実現できる。 According to the present invention, vibration can be suppressed at both the resonance point of the shaking method such as rotational motion and the resonance point of the shaking method such as translational motion without increasing the damping performance of the plurality of dampers. In addition to this, it has the effect of suppressing vibration when passing through the resonance point and suppressing vibration of the floor during subsequent steady rotation. When increasing the capacity of a washing machine, low vibration can be achieved regardless of the amount and method of bias of the cloth.

本発明の実施形態例の洗濯機の右側面の断面図である。It is sectional drawing of the right side surface of the washing machine of the Embodiment of this invention. 本発明の実施形態例の洗濯機の外観斜視図である。It is an external perspective view of the washing machine of the Embodiment of this invention. 本発明の実施形態例の洗濯機の正面の内視図である。It is an inside view of the front of the washing machine of the Embodiment of this invention. 本発明の実施形態例の洗濯機の布量の違いによる偏り方の違いを説明する図である。It is a figure explaining the difference of the bias by the difference of the cloth amount of the washing machine of the Embodiment of this invention. 本発明の実施形態例の洗濯機のダンパーの減衰性能を説明する図である。It is a figure explaining the damping performance of the damper of the washing machine of the Embodiment of this invention.

以下,本発明の実施例について図面を用いながら説明する。 Hereinafter, examples of the present invention will be described with reference to the drawings.

<構成>
まず,その構成を説明する。
<Structure>
First, the configuration will be described.

図1は本実施例の洗濯機の右側面の断面図を示す。図2は本発明の洗濯機の外観斜視図である。ベース1の上部には,鋼板と樹脂成形品を組み合わせ,外殻を構成する筐体2が載せられている。筐体2は,前面側パネルと背面側パネル,左右の側面パネル,上面パネルで構成されている。筐体2の前面側には,洗濯する布類を出し入れするドア3が設けられている。 FIG. 1 shows a cross-sectional view of the right side surface of the washing machine of this embodiment. FIG. 2 is an external perspective view of the washing machine of the present invention. On the upper part of the base 1, a housing 2 which is a combination of a steel plate and a resin molded product and constitutes an outer shell is placed. The housing 2 is composed of a front side panel, a back side panel, left and right side panels, and a top panel. A door 3 for putting in and taking out laundry to be washed is provided on the front side of the housing 2.

筐体2の上部の前面側には,操作パネル4が設けられている。操作パネル4には,電源,スタートまたは一時停止,コース選択などの操作ボタンや,時間や運転条件を表示する画面がある。ベース1の下部の側面には,排水ホース9が設けられている。洗濯槽の下部に排水口7と排水弁8があり,これらを経由して排水ホース9に繋がっている。 An operation panel 4 is provided on the front side of the upper part of the housing 2. The operation panel 4 has operation buttons such as power supply, start or pause, course selection, and a screen for displaying time and operating conditions. A drain hose 9 is provided on the lower side surface of the base 1. There is a drain port 7 and a drain valve 8 at the bottom of the washing tub, and they are connected to the drain hose 9 via these.

洗濯槽は外槽10とこれに内包されているドラム20で構成される。外槽10は前面と背面を有する略円筒に形成されている。外槽は開口部10aのある槽カバー10bと水槽10cとで構成されている。槽カバー10bと水槽10cは分割面10dで分解できるようになっている。外槽10は前面の開口部10aが環状のパッキンのような役割を果たすゴムベローズ11を介して,筺体2の前面側と接続されている。ドア3を閉めることで水封できるようになっている。 The washing tub is composed of an outer tub 10 and a drum 20 contained therein. The outer tank 10 is formed in a substantially cylindrical shape having a front surface and a back surface. The outer tank is composed of a tank cover 10b having an opening 10a and a water tank 10c. The tank cover 10b and the water tank 10c can be disassembled on the dividing surface 10d. The outer tank 10 is connected to the front side of the housing 2 via a rubber bellows 11 in which the opening 10a on the front surface acts like an annular packing. Water can be sealed by closing the door 3.

外槽10の上部には,外槽10の姿勢を保持するための前吊りばね13と後吊りばね14が設けられている。外槽10の下部には,外槽10を下から支えるため,また,多方向に加振力を分散するため,前面側に配置されたダンパー41と背面側に配置されたダンパー42が設けられている。前面側のダンパー41は一対になっており,それらは側面視で,前後位置における同じ位置に配置され,外槽10とベース1に接続されている。外槽10の分割面10dは前後方向の中心よりも前面側に設けられており,複数のダンパーが水槽10cに取り付けられた状態で槽カバー10bの取り外しが可能となっている。 A front suspension spring 13 and a rear suspension spring 14 for maintaining the posture of the outer tank 10 are provided on the upper portion of the outer tank 10. At the lower part of the outer tank 10, a damper 41 arranged on the front side and a damper 42 arranged on the back side are provided in order to support the outer tank 10 from below and to disperse the exciting force in multiple directions. ing. The dampers 41 on the front side are paired, and they are arranged at the same position in the front-rear position in the side view, and are connected to the outer tank 10 and the base 1. The divided surface 10d of the outer tank 10 is provided on the front side of the center in the front-rear direction, and the tank cover 10b can be removed with a plurality of dampers attached to the water tank 10c.

外槽10の下部の前面側には,外槽10の上下,左右,前後方向の振動を検知できるセンサー10eが設けられている。運転時に,外槽10の振動をそのセンサーで計測し,設定された所定値以上となった場合には,ドラム20の回転をやめ,再度,回転速度を上げるようになっている。 On the front side of the lower part of the outer tank 10, a sensor 10e capable of detecting vibration in the vertical, horizontal, and front-back directions of the outer tank 10 is provided. During operation, the vibration of the outer tank 10 is measured by the sensor, and when the value exceeds a set predetermined value, the rotation of the drum 20 is stopped and the rotation speed is increased again.

ドラム20は回転自在なように外槽10の内側に配置されている。ドラム20の内側には洗濯物を掻き揚げる複数個のリフター20eが設けられている。ドラム20の背面側には,ドラム20の補強部材にもなるドラム底板20bが設けられている。ドラム20の前面側の端部には,流体バランサー20dが設けられている。布類の偏りを相殺する効果を有し,運転時の外槽10の振動を抑制させている。 The drum 20 is arranged inside the outer tank 10 so as to be rotatable. A plurality of lifters 20e for scooping up laundry are provided inside the drum 20. On the back surface side of the drum 20, a drum bottom plate 20b that also serves as a reinforcing member of the drum 20 is provided. A fluid balancer 20d is provided at the front end of the drum 20. It has the effect of offsetting the bias of the cloth and suppresses the vibration of the outer tank 10 during operation.

ドラム20はドラム底板20bに固定されたシャフト31を介し,ドラム20の駆動用モーター32と直結されている。この駆動用モーター32は外槽10の背面に固定されている。ドラム20はそのドラム胴板20aに遠心脱水および通風用の脱水孔20cが設けられている。外槽10の下部に排水口7が設けられ,排水弁8を介して排水ホース9に接続されている。 The drum 20 is directly connected to the drive motor 32 of the drum 20 via a shaft 31 fixed to the drum bottom plate 20b. The drive motor 32 is fixed to the back surface of the outer tank 10. The drum 20 is provided with a dehydration hole 20c for centrifugal dehydration and ventilation in the drum body plate 20a. A drainage port 7 is provided at the lower part of the outer tank 10 and is connected to the drainage hose 9 via the drainage valve 8.

筐体2の上部には,給水ホースを接続する給水ユニット15が設けられている。給水ユニット15と洗剤ケース16は配管17を介して接続されている。洗剤ケース16から配管18を介して外槽10の後方に接続されている。給水ユニット15に流入した水は洗剤ケース16を経由して外槽10に流入する構造となっている。 A water supply unit 15 for connecting a water supply hose is provided on the upper portion of the housing 2. The water supply unit 15 and the detergent case 16 are connected to each other via a pipe 17. The detergent case 16 is connected to the rear of the outer tank 10 via a pipe 18. The water that has flowed into the water supply unit 15 has a structure that flows into the outer tank 10 via the detergent case 16.

<動作>
続いて,その動作を説明する。
<Operation>
Next, the operation will be described.

ドア3を開いてドラム20内に洗濯物を投入し,洗剤ケース16内に所定量の洗剤を投入した後,運転させると,まず,洗い工程が実行される。洗い工程では,給水ユニット15内に設けられた給水弁が開き給水された水は,洗剤ケース16を経由して,洗剤と共に外槽10内に入る。この動作を所定時間,実行した後,ドラム20が正転,停止,逆転,停止を繰り返す攪拌動作が所定時間実行される。このとき,ドラム20の中にある布類は,ドラム20内に複数設けられたリフター20eによって回転方向に持ち上げられる。持ち上げられた高さから落下する攪拌動作が繰り返されるため,布類にはたたき洗いの作用が働くことで洗われる。この動作を所定時間行った後,洗い工程を終了する。 When the door 3 is opened, the laundry is put into the drum 20, a predetermined amount of detergent is put into the detergent case 16, and then the operation is performed, the washing step is first executed. In the washing step, the water supply valve provided in the water supply unit 15 is opened, and the supplied water enters the outer tank 10 together with the detergent via the detergent case 16. After executing this operation for a predetermined time, a stirring operation in which the drum 20 repeats forward rotation, stop, reverse rotation, and stop is executed for a predetermined time. At this time, the cloth in the drum 20 is lifted in the rotational direction by a plurality of lifters 20e provided in the drum 20. Since the stirring operation of falling from the lifted height is repeated, the cloth is washed by the action of tapping. After performing this operation for a predetermined time, the washing process is completed.

続いて,脱水工程が実行される。脱水工程では,排水弁8が開き,外槽10内の水が排水ホース9を経由して洗濯機の外に排水される。ドラム20を所定時間高速で一定回転させることで,布類の水分も脱水させる。この動作を所定時間行った後,脱水工程を終了する。 Subsequently, a dehydration step is executed. In the dehydration step, the drain valve 8 is opened, and the water in the outer tub 10 is drained to the outside of the washing machine via the drain hose 9. By rotating the drum 20 at a high speed for a predetermined time at a constant speed, the water content of the cloth is also dehydrated. After performing this operation for a predetermined time, the dehydration step is completed.

脱水工程の後,すすぎ工程が実行される。給水弁を開いて給水し,その水は給水ユニット15と外槽10を接続する配管19を経由して,外槽10内に注水される。すすぎ工程では,洗い工程と同様に,正転,停止,反転,停止の動作を繰り返す攪拌動作が所定時間実行される。このとき,洗濯物がドラム20のリフター20eによって回転方向に持ち上げられ,持ち上げられた高さ位置から落下する攪拌動作が繰り返される。このため,布類に含まれる洗剤が希釈され,すすがれる。 After the dehydration process, a rinsing process is performed. Water is supplied by opening the water supply valve, and the water is injected into the outer tank 10 via the pipe 19 connecting the water supply unit 15 and the outer tank 10. In the rinsing step, as in the washing step, a stirring operation that repeats forward rotation, stop, inversion, and stop operations is executed for a predetermined time. At this time, the laundry is lifted in the rotational direction by the lifter 20e of the drum 20, and the stirring operation of dropping from the lifted height position is repeated. Therefore, the detergent contained in the cloth is diluted and rinsed.

すすぎ工程を行った後,再度,脱水工程を行い,運転を終了する。なお,乾燥機能を備えたドラム式洗濯機の場合,この後,乾燥工程が実行されることになる。 After performing the rinsing process, the dehydration process is performed again to complete the operation. In the case of a drum-type washing machine equipped with a drying function, the drying process will be executed after this.

<実施例>
図3は,本実施例の洗濯機の正面の内視図である。図4は,本実施例の洗濯機の布量の違いによる偏り方の違いを説明する図である。図5は,本実施例の洗濯機のダンパーの減衰性能を説明する図である。
<Example>
FIG. 3 is an internal view of the front of the washing machine of this embodiment. FIG. 4 is a diagram illustrating a difference in bias due to a difference in the amount of cloth in the washing machine of the present embodiment. FIG. 5 is a diagram illustrating the damping performance of the damper of the washing machine of this embodiment.

図3に示すように,筐体2の上部から順に,前吊りばね13と後吊りばね14,水槽10c,複数本のダンパー,これらが筐体2およびベース1に接続されている。ベース1は複数のゴムブッシュ43を介して床と接続している。複数本のダンパーは,洗濯機の側面視にて,前面側に設けられた一対のダンパー41と背面側に設けられたダンパー42とに分かれて配置されている。 As shown in FIG. 3, in order from the upper part of the housing 2, the front suspension spring 13, the rear suspension spring 14, the water tank 10c, and a plurality of dampers are connected to the housing 2 and the base 1. The base 1 is connected to the floor via a plurality of rubber bushes 43. The plurality of dampers are separately arranged as a pair of dampers 41 provided on the front side and a damper 42 provided on the back side in the side view of the washing machine.

運転時には,図4に示すように,布量の違いにより偏り方が異なる。布量が多い場合,ドラム20の前面側あるいは中央付近に布類50の偏り51が形成される。これに対し,布量が少ない場合には,ドラム20の背面側に偏ることになる。 During operation, as shown in FIG. 4, the bias differs depending on the amount of cloth. When the amount of cloth is large, the bias 51 of the cloth 50 is formed on the front side or the vicinity of the center of the drum 20. On the other hand, when the amount of cloth is small, the drum 20 is biased toward the back surface side.

ドラム20の前面側あるいは中央付近に偏り51が形成される場合,洗濯槽は前面側の振動が背面側よりも大きくなる。背面側を起点に首振り運動し,つまり,回転運動のように揺れる。一方で,背面側に偏りがある場合には,洗濯槽は背面側の振動が大きくなりやすい。しかし,前面に接続されるゴムベローズ11による減衰効果があって,首振りのような回転運動とは異なり,洗濯槽全体が並進運動のように揺れる。 When the bias 51 is formed on the front side or the vicinity of the center of the drum 20, the vibration on the front side of the washing tub becomes larger than that on the back side. It swings from the back side as a starting point, that is, it swings like a rotary motion. On the other hand, if there is a bias on the back side, the washing tub tends to vibrate on the back side. However, due to the damping effect of the rubber bellows 11 connected to the front surface, the entire washing tub sways like a translational motion, unlike a rotary motion such as a swing.

運転時には,上記の並進運動のような揺れ方をする共振点や回転運動のような揺れ方をする共振点を必ず通過する。それらの共振点は,洗濯槽とこれを支える複数のばねとダンパーからなる振動系の固有振動数に相当する。運転時の回転速度,つまり,回転周波数とその固有振動数がおおむね一致すると,共振状態が発生する。特に,固有振動の揺れ方と偏り方が一致したときに,共振が顕著になる。 During operation, it always passes through the resonance point that sways like the translational motion and the resonance point that sways like the rotational motion. These resonance points correspond to the natural frequencies of the washing tub and the vibration system consisting of a plurality of springs and dampers that support the washing tub. A resonance state occurs when the rotation speed during operation, that is, the rotation frequency and its natural frequency generally match. In particular, resonance becomes remarkable when the way of shaking and the way of bias of the natural vibration match.

並進運動のような揺れ方をする共振点を通過する際に,ドラム20の背面側に布類50が偏っていれば,共振に近い状態になり,振動が顕著に大きくなる。前面側あるいは中央付近に布類50が偏っていれば,振動はそれほど大きくならない。一方で,回転運動のような揺れ方をする共振点を通過する際には,ドラム20の前面側あるいは中央付近に布類50が偏っていれば,振動が顕著に大きくなる。背面側に偏っていれば,振動はそれほど大きくならない。 If the cloth 50 is biased toward the back surface of the drum 20 when passing through a resonance point that sways like a translational motion, the state is close to resonance and the vibration becomes remarkably large. If the cloth 50 is biased toward the front side or near the center, the vibration does not become so large. On the other hand, when passing through a resonance point that sways like a rotary motion, if the cloth 50 is biased toward the front side or the center of the drum 20, the vibration becomes remarkably large. If it is biased toward the back side, the vibration will not be so large.

並進運動のような単純な揺れ方をする共振点は,回転運動のような複雑な揺れ方をする共振点よりも低くなる。つまり,回転運動のような複雑な揺れ方をする共振点の方が,回転速度が速い分,加振力である遠心力も相対的に大きくなる。 Resonance points with simple swings such as translational motion are lower than resonance points with complex swings such as rotational motion. In other words, at the resonance point that sways in a complicated manner such as rotational motion, the centrifugal force, which is the exciting force, is relatively large because the rotational speed is faster.

また,洗濯機の振動を考える上で,洗濯槽自身の振動の他に,その振動の伝達によって生じる床の振動も考慮する必要がある。洗濯槽起因の共振点を通過した後,十分高い回転速度にて,定常回転する。このような,共振点通過時と定常回転時では,床への振動伝達という点で,ダンパーの減衰の大きさは相反する作用をする。つまり,ダンパーの減衰性能が大きいほど,共振点通過時の床への振動伝達は小さくなるが,一方で,定常回転時の床への振動伝達は大きくなる。 In addition to the vibration of the washing tub itself, it is also necessary to consider the vibration of the floor caused by the transmission of the vibration when considering the vibration of the washing machine. After passing through the resonance point caused by the washing tub, it rotates steadily at a sufficiently high rotation speed. In such a case of passing through the resonance point and during steady rotation, the magnitudes of the damping of the damper have opposite effects in terms of vibration transmission to the floor. In other words, the greater the damping performance of the damper, the smaller the vibration transmission to the floor when passing through the resonance point, but on the other hand, the larger the vibration transmission to the floor during steady rotation.

そこで,本発明の実施例の複数のダンパーは,洗濯槽の前面側に設置された一対のダンパー41と,背面側に設置されたダンパー42とで構成され,前面側のダンパー41いずれよりも,背面側のダンパー42の減衰性能が大きくなるように設定されている。 Therefore, the plurality of dampers of the embodiment of the present invention are composed of a pair of dampers 41 installed on the front side of the washing tub and a damper 42 installed on the back side, and are more than any of the dampers 41 on the front side. The damping performance of the damper 42 on the rear side is set to be large.

前面側に配置したダンパー41は,前面側の振動を減衰させるのに有効であり,これに対して,背面側に配置したダンパー42は,背面側の振動を減衰させるのに有効になる。前面側と背面側に配置したダンパーとで,上記したような共振点に対する振動減衰効果が異なることに着目している。 The damper 41 arranged on the front side is effective for attenuating the vibration on the front side, whereas the damper 42 arranged on the back side is effective for attenuating the vibration on the back side. We are paying attention to the fact that the vibration damping effect on the resonance point as described above differs between the dampers placed on the front side and the back side.

また,ドラム20の前面側あるいは中央付近に偏りができる布量の多い場合は,布量の少ない場合に比べて,偏り量と偏り方を調整しやすい。布量が少ないと,布の動きが大きいからである。また,回転速度が上昇するにつれて布類の水分が掃けていき,偏り量も減っていく。これらを洗濯槽に設置したセンサー10eで検知できる。このセンサー10eは外槽10の上下,左右,前後方向の振動を検知でき,外槽10の下部の前面側に設けられている。このため,上記のように,ダンパーの配置とその減衰性能を設定することで,いずれの共振点通過時の振動にも対応できる。 Further, when the amount of cloth that can be biased on the front side or the vicinity of the center of the drum 20 is large, it is easier to adjust the amount of bias and the method of bias as compared with the case where the amount of cloth is small. This is because when the amount of cloth is small, the movement of the cloth is large. In addition, as the rotation speed increases, the water content of the cloth is swept away, and the amount of bias decreases. These can be detected by the sensor 10e installed in the washing tub. The sensor 10e can detect vibrations in the vertical, horizontal, and front-rear directions of the outer tank 10, and is provided on the front side of the lower portion of the outer tank 10. Therefore, by setting the damper arrangement and its damping performance as described above, it is possible to deal with vibration when passing through any resonance point.

前面側と背面側に配置したダンパーの減衰性能を一律に大きくせずに済むので,いずれの共振点通過時の振動も抑制でき,その後の定常回転時の床の振動も抑制することができる。 Since it is not necessary to uniformly increase the damping performance of the dampers arranged on the front side and the back side, it is possible to suppress the vibration when passing through any resonance point, and it is also possible to suppress the vibration of the floor during the subsequent steady rotation.

なお,ダンパーの減衰性能の大きさは,図5に示すように,ダンパーの伸縮に応じた変位に対して発生する減衰力の軌跡の内側の面積に相当する。この面積は減衰エネルギーとも称される。同じ大きさで変位させるという条件の下,その面積の大きい方が減衰性能は大きいことを意味する。 As shown in FIG. 5, the magnitude of the damping performance of the damper corresponds to the area inside the locus of the damping force generated for the displacement according to the expansion and contraction of the damper. This area is also called damping energy. Under the condition that they are displaced by the same size, the larger the area, the higher the damping performance.

ここで,減衰性能の大小関係の定義を説明する。その大小を比較する際には,その軌跡として,図5(a)から図5(d)に示すようないずれの軌跡であってもよい。図5(a)は楕円のような軌跡である。例えば,オイルダンパーはこのような傾向を示す。図5(b)は矩形のような軌跡である。例えば、摩擦ダンパーはこのような傾向を示す。図5(c)は楕円と矩形の軌跡が組み合わさったような軌跡である。例えば,オイルダンパーや摩擦ダンパーも,微妙な傾きやガタなどの摺動抵抗などにより,このような傾向を示す場合がある。図5(d)は図5(c)のようであって,減衰力が部分的に突出したように大きくなるような軌跡である。例えば,変位の大きさに応じて,段階的に減衰性能が切り替わる機能を持たせたダンパーの場合に,このような軌跡を示す。いずれにしても,軌跡の内側の面積の大きい方が減衰性能は大きいということを意味する。 Here, the definition of the magnitude relationship of the damping performance will be explained. When comparing the magnitudes, the locus may be any locus as shown in FIGS. 5 (a) to 5 (d). FIG. 5A is an elliptical locus. For example, oil dampers show this tendency. FIG. 5B is a rectangular locus. For example, friction dampers show this tendency. FIG. 5C shows a locus as if an ellipse and a rectangular locus were combined. For example, oil dampers and friction dampers may also show such a tendency due to slight inclination and sliding resistance such as backlash. FIG. 5 (d) is as shown in FIG. 5 (c), and is a locus in which the damping force becomes large as if it partially protrudes. For example, such a trajectory is shown in the case of a damper having a function of gradually switching the damping performance according to the magnitude of displacement. In any case, the larger the area inside the locus, the larger the damping performance.

図3は一対の前面側のダンパー41にオイルダンパーを,背面側のダンパー42に摩擦ダンパーを用いた例を示している。しかし,背面側のダンパー42の減衰性能よりも小さいことが重要であって,この範囲であれば,一対の前面側のダンパー41の減衰性能は,互いに同じであっても差があってもよい。ダンパーの種類には,オイルダンパーや摩擦ダンパーなどがある。他に,電磁力を応用して減衰性能を発揮するダンパーもある。しかし,前面側と背面側のダンパーとで減衰性能に大小関係を設けることを意図しているので,ダンパーの種類の組み合わせはいずれであってもよい。 FIG. 3 shows an example in which an oil damper is used for the pair of front dampers 41 and a friction damper is used for the rear damper 42. However, it is important that it is smaller than the damping performance of the damper 42 on the rear side, and within this range, the damping performance of the pair of dampers 41 on the front side may be the same or different from each other. .. Types of dampers include oil dampers and friction dampers. In addition, there is also a damper that exerts damping performance by applying electromagnetic force. However, since the intention is to establish a magnitude relationship between the dampers on the front side and the dampers on the back side in terms of damping performance, any combination of damper types may be used.

一対の前面側のダンパー41の取り付け角度は,互いにほぼ直立し,向かい合うように配置されることが望ましい。前面側のダンパー41にそれぞればねを設けることで,洗濯槽の重さを支持する役割も果たすことができる。一方で,背面側のダンパー42の取り付け角度は,前面側のダンパー41の取り付け角度に対して傾いていることが望ましい。このようにすることで,背面側の上下左右の振動をいずれも抑制する効果を発揮できる。 It is desirable that the mounting angles of the pair of dampers 41 on the front side are arranged so as to be almost upright and facing each other. By providing springs to the dampers 41 on the front side, they can also play a role of supporting the weight of the washing tub. On the other hand, it is desirable that the mounting angle of the damper 42 on the back side is inclined with respect to the mounting angle of the damper 41 on the front side. By doing so, the effect of suppressing the vertical and horizontal vibrations on the back side can be exhibited.

また,このような取り付け角度にすることで,床を上下に揺らす力を発生させやすい前面側のダンパー41の減衰力を低く設定しているので,共振点通過後の定常回転時の床の振動伝達も従来技術に比べて抑制することができる。ここで,その前面側のダンパー41のいずれか,または,両方を,減衰性能を切り替える機能を有するダンパーにしておくことで,床の振動伝達をさらに効果的に低減することもできる。 In addition, by setting such a mounting angle, the damping force of the damper 41 on the front side, which tends to generate a force to shake the floor up and down, is set low, so that the floor vibrations during steady rotation after passing the resonance point. Transmission can also be suppressed as compared with the prior art. Here, by setting either or both of the dampers 41 on the front surface side as dampers having a function of switching the damping performance, it is possible to further effectively reduce the vibration transmission of the floor.

複数のダンパーは,特許文献1にあるように,外槽10あるいはベース1と接続するその両端が回転可動なリンク構造になっていてもよいし,そうでなくてもよい。また,外槽10またはベース1に接続する部分に,ゴムブッシュを介していてもよい。このゴムブッシュは両端に設けてあってもよいし,片側のみであってもよい。特許文献1では,ダンパーの下側にのみゴムブッシュを設けてある構成が示されている。 As described in Patent Document 1, the plurality of dampers may or may not have a link structure in which both ends connected to the outer tank 10 or the base 1 are rotatable. Further, a rubber bush may be interposed in a portion connected to the outer tank 10 or the base 1. This rubber bush may be provided at both ends or may be provided on only one side. Patent Document 1 shows a configuration in which a rubber bush is provided only on the lower side of the damper.

複数のダンパーは,特許文献1にもあるように,変位が伸縮することで減衰力を発揮する,ごく一般的なダンパーでもよいし,変位ではなく回転角に応じて減衰力を発揮させるようなダンパーであってもよい。本発明は減衰性能の大小関係を設けることを意図するもので,そのダンパーの形式によって対象範囲を制限するものではない。 As described in Patent Document 1, the plurality of dampers may be a very general damper that exerts a damping force by expanding or contracting the displacement, or exerts a damping force according to the rotation angle instead of the displacement. It may be a damper. The present invention is intended to establish a magnitude relationship of damping performance, and does not limit the target range by the type of the damper.

以上の実施例により,共振点通過時の振動抑制とその後の定常回転時の床の振動抑制を両立でき,洗濯機の大容量化を図る場合に,布類の量や偏り方によらず,低振動性を実現できる。 According to the above embodiment, it is possible to suppress the vibration when passing through the resonance point and the vibration of the floor during the subsequent steady rotation, and when increasing the capacity of the washing machine, regardless of the amount of cloth or the bias. Low vibration can be achieved.

1 ベース
2 筐体
3 ドア
10 外槽
a 開口部
b 槽カバー
c 水槽
d 分割面
e センサー
11 ゴムベローズ
13 前吊りばね
14 後吊りばね
20 ドラム
a 胴板
b 底板
c 脱水孔
d 流体バランサー
e リフター
31 シャフト
32 駆動用モーター
41 前面側ダンパー
42 背面側ダンパー
43 ゴムブッシュ
50 布類
51 偏り
1 Base 2 Housing 3 Door 10 Outer tank a Opening b Tank cover c Water tank d Divided surface e Sensor 11 Rubber bellows 13 Front suspension spring 14 Rear suspension spring 20 Drum a Body plate b Bottom plate c Dehydration hole d Fluid balancer e Lifter 31 Shaft 32 Drive motor 41 Front side damper 42 Back side damper 43 Rubber bush 50 Clothes 51 Unbalanced

Claims (7)

布類を収めた状態で回転するドラムと,前記ドラムを回転自在に内包する外槽と,前記ドラムと前記外槽とを含む洗濯槽の下部に設けられた複数のダンパーと,前記洗濯槽と複数のダンパーを内包した筺体およびベースと,を備え、
前記外槽は、槽カバーと水槽で構成され、前記槽カバーと前記水槽は分割面で分割可能であって、
前記分割面は、前記外槽の前後方向の中心よりも前面側に設けられており、
前記複数のダンパーは,前記分割面より後方に設置された一対のダンパーと,前記一対のダンパーの後方に設置されたダンパーと、を有し,
前記一対のダンパーいずれの減衰性能よりも,前記一対のダンパーの後方に設置されたダンパーの減衰性能が大きいことを特徴とするドラム式洗濯機。
A drum that rotates with cloth stored in it, an outer tub that rotatably contains the drum, a plurality of dampers provided at the bottom of the washing tub that includes the drum and the outer tub, and the washing tub. Equipped with a housing and base that include multiple dampers,
The outer tank is composed of a tank cover and a water tank, and the tank cover and the water tank can be divided by a dividing surface.
The dividing surface is provided on the front side of the center of the outer tank in the front-rear direction.
The plurality of dampers include a pair of dampers installed behind the split surface and a damper installed behind the pair of dampers .
A drum-type washing machine characterized in that the damping performance of a damper installed behind the pair of dampers is greater than the damping performance of any of the pair of dampers.
請求項1に記載のドラム式洗濯機において,
運転時のドラムの中の布類の偏りが判別可能なセンサーを備え、
前記センサーが前記外槽の下部の前記分割面より前面側に設置されていることを特徴とするドラム式洗濯機。

In the drum type washing machine according to claim 1,
Equipped with a sensor that can determine the bias of the cloth in the drum during driving
A drum-type washing machine characterized in that the sensor is installed on the front side of the divided surface at the lower part of the outer tub.

請求項1に記載のドラム式洗濯機において,
前記分割面より後方に設置された一対のダンパーはほぼ直立した状態で設置され,
前記一対のダンパーの後方に設置されたダンパーは前記分割面より後方に設置された一対のダンパーよりも傾いた状態で設置されていることを特徴とするドラム式洗濯機。
In the drum type washing machine according to claim 1,
The pair of dampers installed behind the split surface were installed in an almost upright position.
A drum-type washing machine characterized in that the dampers installed behind the pair of dampers are installed in a state of being tilted more than the pair of dampers installed behind the split surface .
請求項1に記載のドラム式洗濯機において,
前記分割面より後方に設置された一対のダンパーはばねとともに設置されていることを特徴とするドラム式洗濯機。
In the drum type washing machine according to claim 1,
A drum-type washing machine characterized in that a pair of dampers installed behind the split surface are installed together with a spring.
請求項1に記載のドラム式洗濯機において,
前記分割面より後方に設置された一対のダンパーに減衰性能を切り替える機能を有するダンパーを用いたことを特徴とするドラム式洗濯機。
In the drum type washing machine according to claim 1,
A drum-type washing machine characterized in that a damper having a function of switching damping performance is used for a pair of dampers installed behind the divided surface .
請求項1に記載のドラム式洗濯機において,
前記一対のダンパーの後方に設置されたダンパーは直線的に伸縮することで減衰性能を発揮するダンパーを用いたことを特徴とするドラム式洗濯機。
In the drum type washing machine according to claim 1,
A drum-type washing machine characterized in that the damper installed behind the pair of dampers uses a damper that exhibits damping performance by expanding and contracting linearly.
請求項1に記載のドラム式洗濯機において,
その複数のダンパーのうち,前記一対のダンパーの後方に設置されたダンパーは回転角により減衰性能を発揮するダンパーを用いたことを特徴とするドラム式洗濯機。
In the drum type washing machine according to claim 1,
Among the plurality of dampers, the damper installed behind the pair of dampers is a drum-type washing machine characterized by using a damper that exhibits damping performance depending on the angle of rotation.
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