JP2007061124A - Washing machine - Google Patents

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Publication number
JP2007061124A
JP2007061124A JP2005247102A JP2005247102A JP2007061124A JP 2007061124 A JP2007061124 A JP 2007061124A JP 2005247102 A JP2005247102 A JP 2005247102A JP 2005247102 A JP2005247102 A JP 2005247102A JP 2007061124 A JP2007061124 A JP 2007061124A
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Prior art keywords
washing machine
dynamic vibration
washing
vibration absorber
tub
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JP2005247102A
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Japanese (ja)
Inventor
Masahito Kyo
雅人 姜
Toshinari Matsumoto
俊成 松本
Hiroshi Takaso
高祖  洋
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to JP2005247102A priority Critical patent/JP2007061124A/en
Publication of JP2007061124A publication Critical patent/JP2007061124A/en
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  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To improve the damping performance of a washing machine inexpensively and silently by eliminating a water supply/drain device and the piping, etc. without using liquid such as water. <P>SOLUTION: The washing machine has a weight 42 in an outer tub 33 and a dynamic damper 41 structured to support the weight 42 with a support spring 43 and an air damper 44. In the dynamic damper 41, the modulus of elasticity of the support spring 43 and the damping force of the air damper 44 are set to correspond to the intrinsic vibration frequency of the outer tub which varies according to the rotational frequency of a washing/dewatering tub. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、衣類等の洗濯を行う洗濯機に関するものである。   The present invention relates to a washing machine for washing clothes and the like.

従来、この種の洗濯機は、衣類の偏心荷重による脱水起動時の外槽の大きな振動を抑えるために外槽の重量を重くしていた(例えば、特許文献1参照)。図14に示すように、本体1と、本体1内にサスペンション2によって支持された外槽3と、外槽3内に水平軸を中心に回転する洗濯兼脱水槽4と、洗濯兼脱水槽4を駆動するモータ5と、外槽3の下部と本体1との間に設けたダンパ6と、外槽3に設け、その振動具合に応じて水を溜める振動抑制用のタンク7とを備えたものであり、脱水起動時にはこのタンク7に水を満たし、脱水起動時の大きな振動は、タンク7に満たした水の重量によって抑えることができるようにしたものである。
特開平5−131075号公報
Conventionally, in this type of washing machine, the weight of the outer tub is increased in order to suppress a large vibration of the outer tub at the time of dehydration activation due to the eccentric load of clothes (for example, see Patent Document 1). As shown in FIG. 14, the main body 1, the outer tub 3 supported by the suspension 2 in the main body 1, the washing / dehydrating tub 4 rotating around the horizontal axis in the outer tub 3, and the washing / dehydrating tub 4 , A damper 6 provided between the lower portion of the outer tub 3 and the main body 1, and a vibration suppression tank 7 provided in the outer tub 3 for accumulating water according to the vibration condition. The tank 7 is filled with water at the start of dehydration, and a large vibration at the start of dehydration can be suppressed by the weight of the water filled in the tank 7.
JP-A-5-131075

しかしながら、前記従来の構成では、タンク7に水を満たすための給水装置や排水するための排水装置が必要でありコスト高であった。また、給排水のための配管は、脱水時の振動で騒音を発生していた。更に、タンク7を満水にしないで、水の揺動エネルギを利用して制振効果を得る場合も、タンク7内の水の振動音が問題となっていた。   However, the conventional configuration requires a water supply device for filling the tank 7 with water and a drainage device for draining, which is expensive. In addition, piping for water supply and drainage generated noise due to vibration during dehydration. Further, even when the vibration suppression effect is obtained by using the vibration energy of the water without filling the tank 7, the vibration noise of the water in the tank 7 has been a problem.

本発明は、前記従来の課題を解決するもので、水等、液体を使用せず、給排水装置、配管等の付属品を無くし、簡略な構成により安価で静かに振動性能を向上させた洗濯機を提供することを目的とする。   The present invention solves the above-mentioned conventional problems, does not use water or other liquids, eliminates accessories such as water supply / drainage devices and piping, and has a simple configuration at low cost and quietly improving vibration performance. The purpose is to provide.

前記従来の課題を解決するために、本発明の洗濯機は、外槽に空気ダンパと支持ばねと錘で構成した動吸振器を設け、前記動吸振器は、洗濯兼脱水槽の回転速度により変化する外槽の固有振動数に対応するように、前記支持ばねの弾性係数と空気ダンパの減衰力を設定したものである。   In order to solve the above-described conventional problems, the washing machine of the present invention is provided with a dynamic vibration absorber composed of an air damper, a support spring, and a weight in an outer tub, and the dynamic vibration absorber depends on the rotation speed of the washing and dehydrating tub. The elastic coefficient of the support spring and the damping force of the air damper are set so as to correspond to the changing natural frequency of the outer tub.

これによって、洗濯物の偏心荷重による脱水起動時の外槽の大きな振動が錘を励振し、錘の振動エネルギとして外槽の振動エネルギが消費されることになり、外槽の振動を低減することができる。特に、外槽の洗濯機外枠への衝突を引き起こし、洗濯機外枠の移動や大きな騒音の原因になっていた脱水起動の初期に発生する振動を効果的に低減することができる。   As a result, the large vibration of the outer tub at the start of dehydration due to the eccentric load of the laundry excites the weight, and the vibration energy of the outer tub is consumed as the vibration energy of the weight, thereby reducing the vibration of the outer tub. Can do. In particular, it is possible to effectively reduce the vibration generated at the initial stage of the dehydration activation, which causes a collision of the outer tub with the outer frame of the washing machine and causes the movement of the outer frame of the washing machine and a large noise.

本発明の洗濯機は、簡略な構成により振動を効果的に低減することができ、防振性能を向上することができる。   The washing machine of the present invention can effectively reduce vibration with a simple configuration, and can improve the vibration-proof performance.

第1の発明は、洗濯機外枠に弾性支持された外槽と、前記外槽内に回転可能に設けられた洗濯兼脱水槽と、前記洗濯兼脱水槽を回転させる駆動手段と、前記外槽に設けた動吸振器とを備え、前記動吸振器は、錘と、前記錘を空気ダンパと支持ばねにより支持する構成とし、前記動吸振器は、前記洗濯兼脱水槽の回転速度により変化する前記外槽の固有振動数に対応するように、前記支持ばねの弾性係数と空気ダンパの減衰力を設定したことにより、洗濯物の偏心荷重による脱水起動時の外槽の大きな振動が錘を励振し、錘の振動エネルギとして外槽の振動エネルギが消費され、動吸振器が前記外槽の共振による振動に効果的に作用することになり、脱水起動時に発生する大きな振動において制振効果を発揮することができる。また、空気ダンパを利用した動吸振器は三要素型動吸振器として表現され、通常のばねとダンパからなる二要素型動吸振器と比べて、制振性能が高く、さらに作動流体が空気であることから、経年変化がなく保守を容易にすることができる。   According to a first aspect of the present invention, there is provided an outer tub elastically supported by an outer frame of a washing machine, a washing / dehydrating tub rotatably provided in the outer tub, driving means for rotating the washing / dehydrating tub, and the outer A dynamic vibration absorber provided in the tank, wherein the dynamic vibration absorber is configured to support a weight, and the weight is supported by an air damper and a support spring, and the dynamic vibration absorber varies depending on a rotation speed of the washing and dewatering tank. By setting the elastic coefficient of the support spring and the damping force of the air damper so as to correspond to the natural frequency of the outer tub, the large vibration of the outer tub at the start of dehydration due to the eccentric load of the laundry The vibration energy of the outer tub is consumed as the vibration energy of the weight, and the dynamic vibration absorber effectively acts on the vibration due to the resonance of the outer tub. It can be demonstrated. In addition, a dynamic vibration absorber using an air damper is expressed as a three-element dynamic vibration absorber, which has higher vibration damping performance and a working fluid that is air than a two-element dynamic vibration absorber consisting of a normal spring and damper. As a result, there is no secular change and maintenance can be facilitated.

第2の発明は、特に、第1の発明の洗濯機に洗濯兼脱水槽の回転速度を検知する速度検知手段を設け、動吸振器は、前記速度検知手段により検知した前記洗濯兼脱水槽の回転速度に応じて、支持ばねの弾性係数が、脱水起動時の外槽の共振周波数と、脱水時の定常状態時の前記外槽の振動周波数に対応するように、自動的に調整されるようにしたことにより、前記洗濯兼脱水槽の回転速度が、前記外槽の共振周波数に一致した時の前記外槽の激しい振動と、前記洗濯兼脱水槽の回転速度が定常回転速度に達した時の前記外槽の振動を効果的に低減することができる。   In the second invention, in particular, the washing machine of the first invention is provided with speed detecting means for detecting the rotation speed of the washing and dewatering tub, and the dynamic vibration absorber is provided for the washing and dewatering tub detected by the speed detecting means. According to the rotation speed, the elastic coefficient of the support spring is automatically adjusted so as to correspond to the resonance frequency of the outer tub at the start of dehydration and the vibration frequency of the outer tub at the steady state at the time of dehydration. When the rotational speed of the washing and dewatering tub coincides with the resonance frequency of the outer tub, and when the rotational speed of the washing and dewatering tub reaches a steady rotational speed The vibration of the outer tub can be effectively reduced.

第3の発明は、特に、第1または第2の発明の動吸振器に外枠を設け、前記外枠に弾性体の一端を固定し、前記弾性体が錘に対して、進退自在となるように、前期外枠を移動させて、前記弾性体と前記錘が接触、離反する構成としたことにより、前記動吸振器の弾性係数を、前記弾性体が前記錘と接触時は高く、離反時には低くすることができ、その結果、脱水起動時の外槽の振動数が低い時には、前記弾性体を離反させ、脱水定常状態の時の前記外槽の振動数が高い時には、前記弾性体を接触させるというように、簡単な動作で前記動吸振器の弾性係数を調整する事ができ、前記洗濯兼脱水槽の回転速度が、前記外槽の共振周波数に一致した時の前記外槽の激しい振動と、前記洗濯兼脱水槽の回転速度が定常回転速度に達した時の前記外槽の振動を効果的に低減することができる。   In the third invention, in particular, the dynamic vibration absorber of the first or second invention is provided with an outer frame, and one end of an elastic body is fixed to the outer frame, so that the elastic body can advance and retreat with respect to the weight. As described above, the outer frame is moved so that the elastic body and the weight are in contact with and separated from each other, so that the elastic coefficient of the dynamic vibration absorber is high when the elastic body is in contact with the weight and the separation is performed. As a result, when the frequency of the outer tub at the start of dehydration is low, the elastic body is separated, and when the frequency of the outer tub at the dehydration steady state is high, the elastic body is The elastic coefficient of the dynamic vibration absorber can be adjusted with a simple operation, such that the rotation speed of the washing and dewatering tank matches the resonance frequency of the outer tank. Vibration and the outer tub when the rotation speed of the washing / dehydrating tub reaches a steady rotation speed It is possible to effectively reduce the vibration.

第4の発明は、特に、第1または第2の発明の動吸振器に、一対の支持ばねと、減衰力を可変とした空気ダンパを直列に設けて、錘を支持する構成としたことにより、前記空気ダンパの減衰力が弱い時には、前記支持ばねが直列に接続された状態になり、前記動吸振器の弾性係数は小さくなり、減衰力が強い時には、対となる前記支持ばねは効力を失い、前記動吸振器の弾性係数が大きくなるというように、前記動吸振器の弾性係数を調整することができる。その結果、脱水起動時の外槽の振動数が低い時の振動と、脱水定常状態の時の前記外槽の振動数が高い時の振動の両方を効果的に低減する事ができる。また、前記動吸振器は新たに外枠を設ける必要がないため、設置スペースを小さくすることができる。   In the fourth invention, in particular, the dynamic vibration absorber of the first or second invention is provided with a pair of support springs and an air damper having a variable damping force in series to support the weight. When the damping force of the air damper is weak, the support springs are connected in series, the elastic coefficient of the dynamic vibration absorber is small, and when the damping force is strong, the paired support springs are effective. The elastic coefficient of the dynamic vibration absorber can be adjusted such that the elastic coefficient of the dynamic vibration absorber is lost. As a result, it is possible to effectively reduce both the vibration when the frequency of the outer tank at the time of dehydration activation is low and the vibration when the frequency of the outer tank at the time of steady dehydration is high. Further, since the dynamic vibration absorber does not need to be newly provided with an outer frame, the installation space can be reduced.

第5の発明は、特に、第1または第2の発明の動吸振器に、支持ばねと、ばねを内装し減衰力を可変とした空気ダンパを直列に接続して錘を支持する構成としたことにより、前記空気ダンパの減衰力が弱い時には、前記支持ばねが直列に接続された状態になり、前記動吸振器の弾性係数が小さくなり、減衰力が強い時には、対となる前記支持ばねは効力を失い、前記動吸振器の弾性係数が大きくなるというように、前記動吸振器の弾性係数を調整することができる。その結果、脱水起動時の外槽の振動数が低い時の振動と、脱水定常状態の時の前記外槽の振動数が高い時の振動の両方を効果的に低減する事ができる。また、ばねと空気ダンパが一体構造となっているため、組み立て性を向上させることができる。   The fifth aspect of the invention is particularly configured to support the weight by connecting the dynamic damper of the first or second aspect of the invention in series with a support spring and an air damper having a built-in spring and variable damping force. Thus, when the damping force of the air damper is weak, the support springs are connected in series, the elastic coefficient of the dynamic vibration absorber becomes small, and when the damping force is strong, the paired support springs are It is possible to adjust the elastic coefficient of the dynamic vibration absorber so that the elastic coefficient of the dynamic vibration absorber is increased. As a result, it is possible to effectively reduce both the vibration when the frequency of the outer tank at the time of dehydration activation is low and the vibration when the frequency of the outer tank at the time of steady dehydration is high. Moreover, since the spring and the air damper have an integral structure, the assemblability can be improved.

第6の発明は、特に、第1〜第5のいずれか1つの発明の動吸振器を洗濯機外枠に設けたことにより、洗濯兼脱水槽の回転速度が前記洗濯機外枠の固有振動数に一致した時の前記洗濯機外枠の大きな振動、または、前記洗濯兼脱水槽の回転速度が定常回転速度に達した時の前記洗濯機外枠の振動を効果的に低減することができる。   In the sixth invention, in particular, the dynamic vibration absorber of any one of the first to fifth inventions is provided in the outer frame of the washing machine, so that the rotational speed of the washing and dewatering tub is the natural vibration of the outer frame of the washing machine. The vibration of the washing machine outer frame when the number matches the number, or the washing machine outer frame vibration when the rotation speed of the washing and dewatering tub reaches a steady rotation speed can be effectively reduced. .

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(実施の形態1)
図1は、本発明の第1の実施の形態における洗濯機の断面図、図2は、同洗濯機の動吸振器の断面図を示すものである。図1、図2において、洗濯機外枠30は、4本の引っ張りばね31と、2本のダンパ32により外槽33を弾性支持している。洗濯兼脱水槽34は外槽33内に回転自在に配設している。モータ(駆動手段)35は、ブラシレス直流モータから成っており、インバータ制御され、回転速度が自在に変化されるようになっている。そして、直接洗濯兼脱水槽34を駆動する。給水手段36は洗濯兼脱水槽34内に給水するものである。
(Embodiment 1)
FIG. 1 is a sectional view of a washing machine according to the first embodiment of the present invention, and FIG. 2 is a sectional view of a dynamic vibration absorber of the washing machine. 1 and 2, the washing machine outer frame 30 elastically supports an outer tub 33 with four tension springs 31 and two dampers 32. The washing / dehydrating tub 34 is rotatably disposed in the outer tub 33. The motor (driving means) 35 is composed of a brushless DC motor and is controlled by an inverter so that the rotational speed can be freely changed. Then, the washing / dehydrating tub 34 is directly driven. The water supply means 36 supplies water into the washing / dehydrating tub 34.

水位検知手段37は、外槽33内の洗濯水位を検知する。排水手段38は、外槽33内の洗濯水を排水するものである。制御装置39は、洗濯機外枠30の前面下部に設けられている。制御装置39は、洗濯機外枠30の前面上部に設けられた操作表示手段40により入力された設定内容に基いて洗い、すすぎ、脱水の各行程を逐次制御するもので、パワースイッチング手段(図示せず)を介してモータ35、給水手段36、排水手段38などを逐次制御する。   The water level detection means 37 detects the washing water level in the outer tub 33. The drainage means 38 drains the washing water in the outer tub 33. The control device 39 is provided at the lower front portion of the washing machine outer frame 30. The control device 39 sequentially controls each process of washing, rinsing and dehydration based on the setting contents input by the operation display means 40 provided on the upper front surface of the washing machine outer frame 30. The power switching means (FIG. The motor 35, the water supply means 36, the drainage means 38, etc. are sequentially controlled via a not-shown).

動吸振器41は、外槽下部33aに固定されている。動吸振器41は、錘42、支持ばね43、空気ダンパ44、固定部45から構成されている。それぞれの取り付け方法として、例えば、支持ばね43の中に空気ダンパ44を入れ、空気ダンパ44のシリンダ44aの一端を固定部45に接着し、空気バネ44のピストンロッド44bを錘42に形成した固定穴42aを利用して錘42にねじ止めすることによって弾性支持する方法が考えられる。また、動吸振器41は外槽下部33aに限らず、外槽33の上部に固定しても同様の効果が得られる。動吸振器41は、固定部45に形成した固定穴45aを利用して外槽下部33aにねじ止めされる。   The dynamic vibration absorber 41 is fixed to the outer tank lower portion 33a. The dynamic vibration absorber 41 includes a weight 42, a support spring 43, an air damper 44, and a fixed portion 45. As each mounting method, for example, an air damper 44 is inserted into the support spring 43, one end of the cylinder 44a of the air damper 44 is bonded to the fixing portion 45, and a piston rod 44b of the air spring 44 is formed on the weight 42. A method of elastic support by screwing the weight 42 using the hole 42a is conceivable. Moreover, the same effect is acquired even if the dynamic vibration absorber 41 is fixed to the upper part of the outer tank 33 not only in the outer tank lower part 33a. The dynamic vibration absorber 41 is screwed to the outer tank lower portion 33a using a fixing hole 45a formed in the fixing portion 45.

支持ばね43の弾性係数および、空気ダンパ44の減衰係数は、下記に示す動吸振器の最適設計条件を利用して調整する。本発明における動吸振器をモデル化すると、図3に示すような三要素の動吸振器となる。ここで、空気ダンパ44を図4に示すようにピストンとシリンダのすきま(流路)を空気が流れるときの粘性抵抗を減衰力として利用する粘性空気ダンパとし、空気ダンパ44の弾性係数をKa、減衰係数をCとすると、各係数は以下の式から求められる。
Ka=γP/h (1)
C=αA /(1+3ε/2) (2)
ここで用いられている各記号について、γは比熱比(=1.4)、Pは大気圧、Aはピストンの断面積、αは流路抵抗係数で以下の式から求められる。
α=12μL/bh (3)
b=Π(d+d) (4)
h=(d−d)/2 (5)
ここで、μは空気の粘性、その他の各係数については、空気ダンパ44の形状に関する係数を示しており、それらを図4に示す。
The elastic coefficient of the support spring 43 and the damping coefficient of the air damper 44 are adjusted using the optimum design conditions of the dynamic vibration absorber shown below. When the dynamic vibration absorber in the present invention is modeled, a three-element dynamic vibration absorber as shown in FIG. 3 is obtained. Here, as shown in FIG. 4, the air damper 44 is a viscous air damper that uses the viscous resistance when air flows through the clearance (flow path) between the piston and the cylinder as a damping force, and the elastic coefficient of the air damper 44 is Ka, When the attenuation coefficient is C, each coefficient can be obtained from the following equation.
Ka = γP 0 A p / h p (1)
C = αA p 2 / (1 + 3ε 2/2) (2)
For each symbol used here, γ is the specific heat ratio (= 1.4), P 0 is the atmospheric pressure, Ap is the cross-sectional area of the piston, and α is the flow resistance coefficient, and is obtained from the following equation.
α = 12μ 0 L / bh 3 (3)
b = Π (d c + d P ) (4)
h = (d c −d P ) / 2 (5)
Here, μ 0 indicates the viscosity of the air, and other coefficients, which are coefficients related to the shape of the air damper 44, and these are shown in FIG.

また、最適設計条件について、主振動系である洗濯機本体と動吸振器系の質量比μ(=m/M)(mは錘42の質量、Mは外槽の質量)、固有振動数比ν(=ω/Ω)(ωは動吸振器41の固有振動数、Ωは外槽33の固有振動数)、動吸振器41の支持ばね43の弾性係数Kb、空気ダンパ44の弾性係数と支持ばね43の弾性係数の比をκ(=Ka/Kb)、動吸振器41の減衰比ζ(=C/2mω)とすると、ν、κ、ζについて以下の式に示すような最適値が存在する。
νopt=√((1/(1+μ))×(1−√(μ/(1+μ))) (6)
κopt=2(μ+√(μ×(1+μ)) (7)
ζopt=√(((1+r)/r)×(−y−√(y−xz))/x)) (8)
ここで、r、x、y、zの各係数は以下の式で示される。
r=√((1+μ)/μ) (9)
x=−2−2r+5r+4r−2r+r (10)
y=2−3r−r (11)
z=−2+2r+r (12)
そこで、動吸振器41の設計の際には、まず錘42の質量を決め、μを求め、(6)、(7)、(8)式で示した最適値に合うように、支持ばね43の弾性係数Kbと、空気ダンパ44の弾性係数Ka、減衰係数Cを求め、さらに(1)、(2)式を利用して空気ダンパの形状を決定する。
In addition, with regard to the optimum design conditions, the mass ratio μ (= m / M) (m is the mass of the weight 42, M is the mass of the outer tub), the natural frequency ratio of the washing machine body and the dynamic vibration absorber system that are the main vibration system ν (= ω / Ω) (ω is the natural frequency of the dynamic vibration absorber 41, Ω is the natural frequency of the outer tank 33), the elastic coefficient Kb of the support spring 43 of the dynamic vibration absorber 41, the elastic coefficient of the air damper 44, Assuming that the ratio of the elastic coefficient of the support spring 43 is κ (= Ka / Kb) and the damping ratio ζ (= C / 2 mω) of the dynamic vibration absorber 41, optimum values as shown in the following formulas for ν, κ, and ζ are obtained. Exists.
ν opt = √ ((1 / (1 + μ)) × (1−√ (μ / (1 + μ))) (6)
κ opt = 2 (μ + √ (μ × (1 + μ)) (7)
ζ opt = √ (((1 + r) / r) × (−y−√ (y 2 −xz)) / x)) (8)
Here, the coefficients of r, x, y, and z are expressed by the following equations.
r = √ ((1 + μ) / μ) (9)
x = −2−2r + 5r 2 + 4r 3 −2r 5 + r 6 (10)
y = 2-3r 2 -r 4 (11 )
z = −2 + 2r + r 2 (12)
Therefore, when designing the dynamic vibration absorber 41, first, the mass of the weight 42 is determined, μ is obtained, and the support spring 43 is adjusted so as to meet the optimum values shown in the equations (6), (7), and (8). The elastic coefficient Kb, the elastic coefficient Ka of the air damper 44, and the damping coefficient C are obtained, and the shape of the air damper is determined using equations (1) and (2).

以上のように構成された洗濯機について、以下その動作、作用を説明する。まず、洗濯兼脱水槽34内に衣類と洗剤を投入後、操作表示手段40を操作して運転を開始する。これによって、給水手段36が動作し、洗濯兼脱水槽34内に洗濯水が供給されると共に洗濯兼脱水槽34も回転を開始する。規定量の洗濯水が供給されると給水手段36は給水を停止する。洗濯兼脱水槽34の回転によって、洗剤は洗濯水に溶かされ、洗濯液となって衣類に浸透する。洗濯兼脱水槽34は、30r/min程度の低速で回転して、衣類を持ち上げては落とすというたたき洗いを規定時間行う。   About the washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. First, after putting clothes and detergent into the washing and dewatering tub 34, the operation display means 40 is operated to start operation. As a result, the water supply means 36 operates, the washing water is supplied into the washing / dehydrating tub 34, and the washing / dehydrating tub 34 also starts rotating. When the specified amount of washing water is supplied, the water supply means 36 stops water supply. By the rotation of the washing and dewatering tub 34, the detergent is dissolved in the washing water and becomes a washing liquid and penetrates into the clothes. The washing and dewatering tub 34 rotates at a low speed of about 30 r / min, and performs washing for a specified time to lift and drop the clothes.

洗濯終了後、排水手段38が作動し、汚れを溶かし込んだ洗濯液は、外槽33の外に排水される。排水終了後、洗濯兼脱水槽34の回転は徐々に速くなる。洗濯兼脱水槽34の回転による振動周波数が、外槽33の共振周波数に近づくと外槽33は洗濯機外枠30に衝突し、激しい時は、洗濯機外枠30が移動する。しかしながら、この共振時に、外槽33の振動が、外槽下部33aに取り付けた動吸振器41の錘42を励振し、錘42は大きく振動するようになる。その結果、外槽33の振動は小さく抑えられる。   After the washing is finished, the drainage means 38 is operated, and the washing liquid in which the dirt is dissolved is drained out of the outer tub 33. After the drainage is completed, the rotation of the washing and dewatering tank 34 is gradually increased. When the vibration frequency due to the rotation of the washing and dewatering tub 34 approaches the resonance frequency of the outer tub 33, the outer tub 33 collides with the washing machine outer frame 30, and when it is severe, the washing machine outer frame 30 moves. However, at the time of this resonance, the vibration of the outer tub 33 excites the weight 42 of the dynamic vibration absorber 41 attached to the outer tub lower portion 33a, and the weight 42 vibrates greatly. As a result, the vibration of the outer tub 33 can be kept small.

以上のように本実施の形態においては、動吸振器41の支持ばね43弾性係数、空気ダンパ44の弾性係数、減衰係数を動吸振器の最適設計条件を利用し、脱水起動時の外槽33の共振点に合うように設定し、外槽下部33aに取り付けたことにより、錘42の加振エネルギとして外槽33の振動エネルギが消費されることになり、外槽33の共振点における激しい振動を効果的に低減することができる。また、空気ダンパを利用した動吸振器は三要素型動吸振器として表現され、通常のばねとダンパからなる二要素型動吸振器と比べて制振性能が高く、さらに作動流体が空気であることから、経年変化がなく保守を容易にすることができる。   As described above, in the present embodiment, the outer tank 33 at the time of dehydration start is determined by using the elastic spring 41 elastic coefficient of elasticity, the elastic coefficient of the air damper 44, and the damping coefficient of the dynamic damper 41 using the optimum design condition of the dynamic damper. The vibration energy of the outer tub 33 is consumed as the vibration energy of the weight 42 by setting it so as to match the resonance point of the outer tub 33a. Can be effectively reduced. In addition, a dynamic vibration absorber using an air damper is expressed as a three-element dynamic vibration absorber, and has a higher damping performance than a two-element dynamic vibration absorber made up of a normal spring and damper, and the working fluid is air. Therefore, there is no secular change, and maintenance can be facilitated.

(実施の形態2)
図5は、本発明の第2の実施の形態における洗濯機の構成図である。本実施の形態において、洗濯兼脱水槽34の回転速度を検知する速度検知手段としてホールセンサ46を設け、このホールセンサ46により、モータ35から回転パルスを読み取る。読み取られた回転パルスは制御回路47に送られ、そこで、1パルスの時間を検出し、それとモータの極数から洗濯兼脱水槽34の回転周期が求められ、得られた回転周期から回転速度が検出される。
(Embodiment 2)
FIG. 5 is a configuration diagram of a washing machine according to the second embodiment of the present invention. In the present embodiment, a hall sensor 46 is provided as a speed detecting means for detecting the rotational speed of the washing / dehydrating tub 34, and the rotation pulse is read from the motor 35 by the hall sensor 46. The read rotation pulse is sent to the control circuit 47, where the time of one pulse is detected, and the rotation period of the washing and dewatering tub 34 is obtained from the number of motor poles, and the rotation speed is calculated from the obtained rotation period. Detected.

本実施の形態では、動吸振器の最適設計条件を利用して、脱水起動時には動吸振器41の弾性係数、減衰係数を外槽33の共振周波数に対応するように設定しておき、検出された洗濯兼脱水槽34の回転速度が定常状態に達した時には、その回転周波数に対応するように、動吸振器41の支持ばね43および、空気ばね44の弾性係数が大きくなるように、制御回路から指令を与える。その結果、洗濯兼脱水槽34の回転速度が、脱水起動時の外槽33の共振周波数に一致した時の外槽33の激しい振動と、洗濯兼脱水槽の回転速度が定常回転速度に達した時の、外槽33の振動を一つの動吸振器で効果的に低減することができる。   In the present embodiment, using the optimum design condition of the dynamic vibration absorber, the elastic coefficient and the attenuation coefficient of the dynamic vibration absorber 41 are set so as to correspond to the resonance frequency of the outer tub 33 when dehydration is started. When the rotational speed of the washing / dehydrating tub 34 reaches a steady state, the control circuit is configured so that the elastic coefficient of the support spring 43 of the dynamic vibration absorber 41 and the air spring 44 is increased so as to correspond to the rotational frequency. Gives a directive from As a result, when the rotational speed of the washing / dehydrating tub 34 coincides with the resonance frequency of the outer tub 33 at the time of dehydration activation, the rotational speed of the outer tub 33 reaches the steady rotational speed. The vibration of the outer tub 33 at the time can be effectively reduced with one dynamic vibration absorber.

(実施の形態3)
図6は、本発明の第3の実施の形態における動吸振器の断面図である。本実施の形態において、動吸振器41に新たに外枠48を設け、この外枠48に弾性体49の一端を固定し、弾性体49が錘42に対して、進退自在となるように、外枠48を外枠48に取り付けたラック50とピニオン51を利用して移動させ、弾性体49と錘42が接触、離反する構成とすることにより、動吸振器41の弾性係数を、弾性体49が錘42と接触した時は高く、離反した時には低く設定することができる。また、外枠48の移動方法として、ピニオン51を回転させることによって、外枠48を移動させる。ピニオンの回転機構については、外枠を移動させるための駆動装置として図7に示す。
(Embodiment 3)
FIG. 6 is a cross-sectional view of a dynamic vibration absorber according to the third embodiment of the present invention. In the present embodiment, a new outer frame 48 is provided in the dynamic vibration absorber 41, and one end of the elastic body 49 is fixed to the outer frame 48 so that the elastic body 49 can move forward and backward with respect to the weight 42. The outer frame 48 is moved using the rack 50 and the pinion 51 attached to the outer frame 48 so that the elastic body 49 and the weight 42 are in contact with and separated from each other, whereby the elastic coefficient of the dynamic vibration absorber 41 is changed to the elastic body. It can be set high when 49 is in contact with the weight 42 and low when it is separated. As a method for moving the outer frame 48, the outer frame 48 is moved by rotating the pinion 51. The pinion rotation mechanism is shown in FIG. 7 as a driving device for moving the outer frame.

ピニオン51は取り付け板52を介して、モータ53に取り付けられる。モータ53は、実施の形態2で示した制御回路47から、洗濯兼脱水槽34の回転速度に関する情報を得て、脱水起動時の外槽33が共振している時には、動吸振器41の弾性係数が小さくなるように、外枠48を弾性体49が錘42から離反させるように回転し、洗濯兼脱水槽34の回転速度が定常状態に達した時には、動吸振器41の弾性係数が大きくなるように、外枠48を弾性体49が錘42に接触させるように回転する。   The pinion 51 is attached to the motor 53 via the attachment plate 52. The motor 53 obtains information on the rotational speed of the washing and dewatering tub 34 from the control circuit 47 shown in the second embodiment, and when the outer tub 33 resonates at the time of dehydration activation, the elasticity of the dynamic vibration absorber 41 is obtained. When the outer frame 48 is rotated so that the elastic body 49 is separated from the weight 42 so that the coefficient becomes small, and the rotational speed of the washing and dewatering tub 34 reaches a steady state, the elastic coefficient of the dynamic vibration absorber 41 becomes large. The outer frame 48 is rotated so that the elastic body 49 contacts the weight 42.

実際には、本実施の形態における洗濯機の脱水起動時の外槽33の共振周波数は約300r/min(5Hz)で、洗濯兼脱水槽34の回転速度が定常状態に達するのは約900r/min(15Hz)であり、起動時から定常時にかけて回転速度は約3倍になる。それに対応するように、動吸振器41の弾性係数を調整しようとすると、弾性係数は約9倍にする必要がある。この時、動吸振器41の弾性係数を支持ばね43と弾性体49の弾性係数の和とする。そこで、弾性体49はその弾性係数の和が、支持ばね43の弾性係数の9倍になるように選択し、動吸振器41を構成する。   Actually, the resonance frequency of the outer tub 33 at the start of dehydration of the washing machine in this embodiment is about 300 r / min (5 Hz), and the rotational speed of the washing and dehydration tub 34 reaches a steady state at about 900 r / min. min (15 Hz), and the rotational speed is approximately tripled from the start-up to the steady-state. Correspondingly, if the elastic coefficient of the dynamic vibration absorber 41 is to be adjusted, the elastic coefficient needs to be about 9 times. At this time, the elastic coefficient of the dynamic vibration absorber 41 is the sum of the elastic coefficients of the support spring 43 and the elastic body 49. Therefore, the elastic body 49 is selected so that the sum of the elastic coefficients thereof is nine times the elastic coefficient of the support spring 43 to constitute the dynamic vibration absorber 41.

以上のようにした結果、脱水起動時の外槽33の振動数が低い時には、弾性体49を離反させ、脱水定常状態の時の外槽33の振動数が高い時には、弾性体49を接触させるというように、簡単な動作で動吸振器41の弾性係数を調整する事ができ、洗濯兼脱水槽34の回転速度が、脱水起動時の外槽33の共振周波数に一致した時の外槽33の激しい振動と、洗濯兼脱水槽の回転速度が定常回転速度に達した時の、外槽33の振動を効果的に低減することができる。   As a result of the above, the elastic body 49 is separated when the frequency of the outer tub 33 at the time of dehydration activation is low, and the elastic body 49 is brought into contact when the frequency of the outer tub 33 at the time of steady dehydration is high. Thus, the elastic coefficient of the dynamic vibration absorber 41 can be adjusted with a simple operation, and the outer tub 33 when the rotational speed of the washing and dewatering tub 34 coincides with the resonance frequency of the outer tub 33 at the start of dehydration. And the vibration of the outer tub 33 when the rotational speed of the washing / dehydrating tub reaches a steady rotational speed can be effectively reduced.

(実施の形態4)
図8は、本発明の第4の実施の形態における動吸振器の断面図である。本実施の形態において、支持ばねA54aと、一対の支持ばねB54b、減衰力を可変とした空気ダンパ55を直列に設けて、錘42を支持する構成とすることで、空気ダンパ55の減衰力が弱い時には、支持ばねA54aと支持ばねB54bが直列に接続された状態になり、動吸振器41の弾性係数は小さくなり、空気ダンパ55の減衰力が強い時には、支持ばね54は振動できなくなることで効力を失い、錘42は、空気ダンパ44と支持ばねA54aだけで支持されている状態となり、動吸振器41の弾性係数は大きくなる。
(Embodiment 4)
FIG. 8 is a cross-sectional view of a dynamic vibration absorber according to the fourth embodiment of the present invention. In the present embodiment, a support spring A54a, a pair of support springs B54b, and an air damper 55 with variable damping force are provided in series to support the weight 42, whereby the damping force of the air damper 55 is reduced. When it is weak, the support spring A 54a and the support spring B 54b are connected in series, the elastic coefficient of the dynamic vibration absorber 41 is small, and when the damping force of the air damper 55 is strong, the support spring 54 cannot vibrate. The effectiveness is lost, and the weight 42 is supported only by the air damper 44 and the support spring A 54a, and the elastic coefficient of the dynamic vibration absorber 41 is increased.

空気ダンパ55の減衰力を可変とする方法について、図9〜図11を用いて示す。図9は空気ダンパの断面図を示す。図10は減衰力を可変にするための装置、図11は図10で示した装置の動作説明のための図である。空気ダンパ55を図9のような構成とすると、減衰力はシリンダ55aに開けたオリフィス55bを通る空気の抵抗によって得られる。つまり、オリフィス55bの開口面積が大きいと抵抗は小さくなり、減衰力が弱まり、逆にオリフィス55aの開口面積を小さくすると抵抗が大きくなり、減衰力が強くなる。   A method for making the damping force of the air damper 55 variable will be described with reference to FIGS. FIG. 9 shows a sectional view of the air damper. FIG. 10 is a device for changing the damping force, and FIG. 11 is a diagram for explaining the operation of the device shown in FIG. When the air damper 55 is configured as shown in FIG. 9, the damping force is obtained by the resistance of air passing through the orifice 55b opened in the cylinder 55a. That is, when the opening area of the orifice 55b is large, the resistance is decreased and the damping force is weakened. Conversely, when the opening area of the orifice 55a is decreased, the resistance is increased and the damping force is increased.

本実施の形態においては、空気ダンパ55の減衰力を強くする場合は、支持ばねB54bが振動できなくなるぐらい強くする必要があるため、オリフィス面積はほぼ零になるようにする必要がある。また、減衰力を弱くする場合は、空気ダンパ55による余分な減衰力を除くため、オリフィス55bの開口面積を大きくして、減衰力をほぼ零にすることが望ましい。これらを同時に実現するために、減衰力が零に近くなるようにオリフィス55aの開口面積を大きくしておき、減衰力を強くする時には空気の出入りをなくすようにオリフィスを塞げるような構成とする必要がある。   In the present embodiment, when the damping force of the air damper 55 is increased, it is necessary to increase the damping force of the support spring B54b so that the support spring B54b cannot vibrate. Further, when the damping force is weakened, it is desirable to increase the opening area of the orifice 55b so that the damping force becomes substantially zero in order to eliminate an excessive damping force due to the air damper 55. In order to realize these simultaneously, the opening area of the orifice 55a is increased so that the damping force is close to zero, and when the damping force is increased, the orifice is closed so as to prevent the air from entering and exiting. There is a need.

そこで、図10のような装置を用いてこれを実現する。この装置は胴体部56、モータ57、ロッド58から構成される。胴体部56には縦と横方向に空洞部56a、56bが設けられており、空洞部56aの両端は突起状になっている。モータ57は胴体部56にねじ止めされている。ロッド58は胴体部56の空洞部56bに挿入され、さらにモータ57と接続することにより、モータ57の回転と連動して回転する。ロッド58には、空洞部58aが設けられており、図11(a)に示すように、ロッド58の空洞部58aと胴体部56の空洞部56aが平行になるようにモータが回転した時には、空洞部56aには空気が流れる状態となり、図11(b)に示すようにロッド58の空洞部58aと胴体部56の空洞部56aが垂直に交わる時には、空洞部56aには空気が流れない。   Therefore, this is realized by using an apparatus as shown in FIG. This apparatus includes a body portion 56, a motor 57, and a rod 58. The body portion 56 is provided with hollow portions 56a and 56b in the vertical and horizontal directions, and both ends of the hollow portion 56a are protruding. The motor 57 is screwed to the body portion 56. The rod 58 is inserted into the hollow portion 56 b of the body portion 56 and further connected to the motor 57 to rotate in conjunction with the rotation of the motor 57. The rod 58 is provided with a cavity 58a. As shown in FIG. 11A, when the motor rotates so that the cavity 58a of the rod 58 and the cavity 56a of the body 56 are parallel to each other, Air flows into the cavity 56a, and when the cavity 58a of the rod 58 and the cavity 56a of the body 56 intersect perpendicularly as shown in FIG. 11B, no air flows into the cavity 56a.

そこで、胴体部56の空洞部56aの突起の片側と、空気ダンパ55のオリフィス55bをチューブ等でつなぐと、上述したような装置の動作によって、オリフィス56aからの空気の出入りを調節することができる。実際には、実施の形態2で示した制御回路47から得られる洗濯兼脱水槽34の回転速度に応じて、モータ57に指令を与える。   Therefore, when one side of the protrusion of the hollow portion 56a of the body portion 56 and the orifice 55b of the air damper 55 are connected by a tube or the like, the air flow from the orifice 56a can be adjusted by the operation of the device as described above. . Actually, a command is given to the motor 57 in accordance with the rotational speed of the washing and dewatering tub 34 obtained from the control circuit 47 shown in the second embodiment.

脱水起動時の外槽33の共振状態の時(300r/min)には、装置が図11(a)の状態となるようにモータに指令を与え、オリフィス56aから空気が流れる状態にし、減衰力を弱くすることによって、図8における支持ばねA54aと支持ばねB54bが直列に接続された状態となるようにし、動吸振器41の弾性係数を小さくする。   When the outer tub 33 is in a resonance state (300 r / min) at the start of dehydration, the apparatus gives a command to the motor so that the state shown in FIG. Is made weak so that the support spring A54a and the support spring B54b in FIG. 8 are connected in series, and the elastic coefficient of the dynamic vibration absorber 41 is reduced.

そして、洗濯兼脱水槽34の回転速度が定常状態に達した時(900r/min)には、装置が図11(b)の状態となるようにモータに指令を与え、オリフィス56aから空気が流れない状態にし、減衰力を強くすることによって、支持ばねB54bの効力をなくし、錘42を空気ダンパ44と支持ばねA54aだけで支持されている状態にし、動吸振器41の弾性係数を大きくする。2本のばねが直列につながれた時の弾性係数Kは、各ばねの弾性係数をk1、k2とすると以下の式から計算できる。
K=k1×k2/(k1+k2) (13)
(13)式を利用すると、本実施の形態では、支持ばねA54aの弾性係数を支持ばねB54bの弾性係数の8倍にしておけば、上述した動作によって、脱水起動時の外槽33の共振状態の時の振動数と、定常状態の時の外槽の振動数が、動吸振器41の固有振動数とほぼ一致するようになる。その結果、洗濯兼脱水槽34の回転速度が、脱水起動時の外槽33の共振周波数に一致した時の外槽33の激しい振動と、洗濯兼脱水槽の回転速度が定常回転速度に達した時の、外槽33の振動を効果的に低減することができる。また、動吸振器41は新たに外枠を設ける必要がないため、設置スペースを小さくすることができる。
When the rotation speed of the washing / dehydrating tub 34 reaches a steady state (900 r / min), the apparatus gives a command to the motor so that the apparatus is in the state of FIG. 11B, and air flows from the orifice 56a. By eliminating the state and increasing the damping force, the effectiveness of the support spring B54b is eliminated, the weight 42 is supported by only the air damper 44 and the support spring A54a, and the elastic coefficient of the dynamic vibration absorber 41 is increased. The elastic coefficient K when the two springs are connected in series can be calculated from the following equation where the elastic coefficients of the springs are k1 and k2.
K = k1 * k2 / (k1 + k2) (13)
When the equation (13) is used, in this embodiment, if the elastic coefficient of the support spring A54a is set to eight times the elastic coefficient of the support spring B54b, the above-described operation causes the resonance state of the outer tub 33 at the start of dehydration. And the vibration frequency of the outer tub in the steady state substantially coincide with the natural frequency of the dynamic vibration absorber 41. As a result, when the rotational speed of the washing / dehydrating tub 34 coincides with the resonance frequency of the outer tub 33 at the time of dehydration activation, the rotational speed of the outer tub 33 reaches the steady rotational speed. The vibration of the outer tub 33 at the time can be effectively reduced. Moreover, since the dynamic vibration absorber 41 does not need to newly provide an outer frame, the installation space can be reduced.

(実施の形態5)
図12は、本発明の第5の実施の形態における動吸振器の断面図である。本実施の形態において、動吸振器41は、支持ばね59と、ばね60aを内装し、減衰力を可変とした空気ダンパ60を直列に接続して、それと並列に設置した空気ダンパ44によって、錘42を支持する構成としている。空気ダンパ60は、両端に設けられた取り付け金具にある固定穴60bを利用して、一方を動吸振器41の固定部45に、もう一方を支持ばね59の土台61にねじ止めすることによって取り付ける。また、空気ダンパの両端は接着により固定してもよい。空気ダンパ60は、下端に空気を出入りさせるためのオリフィス60cが設けられており、図12に示すように、そのオリフィス60cを突起状にし、固定部45を貫通するように取り付けられている。
(Embodiment 5)
FIG. 12 is a sectional view of a dynamic vibration absorber according to the fifth embodiment of the present invention. In the present embodiment, the dynamic vibration absorber 41 includes a support spring 59 and a spring 60a, and an air damper 60 having a variable damping force connected in series. 42 is supported. The air damper 60 is attached by fixing one end to the fixing portion 45 of the dynamic vibration absorber 41 and the other end to the base 61 of the support spring 59 using the fixing holes 60b in the mounting brackets provided at both ends. . Further, both ends of the air damper may be fixed by adhesion. The air damper 60 is provided with an orifice 60c for allowing air to enter and exit at the lower end. As shown in FIG. 12, the orifice 60c has a protruding shape and is attached so as to penetrate the fixing portion 45.

空気ダンパ60の減衰力を可変とする原理は、実施の形態4で示した空気ダンパ55と同様であり、実施の形態4と同様に、空気ダンパ60のオリフィス60cを図10で示した装置に接続する事によって、空気ダンパ60の減衰力を可変とし、動吸振器41の弾性係数を調整する。本実施の形態において、起動時の外槽33の共振による振動、および洗濯兼脱水槽34の回転速度が、定常状態に達した時の外槽33の振動を低減させる原理についても、実施の形態4と同様であり、空気ダンパ60の減衰力の調整によって、支持ばね59と空気ダンパ60に内装されたばね60aの設置状態が直列である時と、直列でない時の動吸振器41の弾性係数の違いを利用して、動吸振器41の固有振動数を変化させ、脱水起動時と脱水定常時の外槽33の振動数に対応するようにしている。   The principle of making the damping force of the air damper 60 variable is the same as that of the air damper 55 shown in the fourth embodiment, and similarly to the fourth embodiment, the orifice 60c of the air damper 60 is used in the apparatus shown in FIG. By connecting, the damping force of the air damper 60 is variable, and the elastic coefficient of the dynamic vibration absorber 41 is adjusted. In the present embodiment, the principle of reducing the vibration due to resonance of the outer tub 33 at the start-up and the vibration of the outer tub 33 when the rotational speed of the washing and dewatering tub 34 reaches a steady state is also described in the embodiment. 4, and by adjusting the damping force of the air damper 60, the elastic coefficient of the dynamic damper 41 when the installation state of the support spring 59 and the spring 60 a built in the air damper 60 is in series and when not in series. By utilizing the difference, the natural frequency of the dynamic vibration absorber 41 is changed so as to correspond to the frequency of the outer tub 33 at the time of dehydration start-up and at the time of steady dehydration.

その結果、洗濯兼脱水槽34の回転速度が、脱水起動時の外槽33の共振周波数に一致した時の外槽33の激しい振動と、洗濯兼脱水槽の回転速度が定常回転速度に達した時の、外槽33の振動を効果的に低減することができる。また、本実施の形態では、空気ダンパ60の中にばね60cが内装されているため、組み立て性を向上させることができる。   As a result, when the rotational speed of the washing / dehydrating tub 34 coincides with the resonance frequency of the outer tub 33 at the time of dehydration activation, the rotational speed of the outer tub 33 reaches the steady rotational speed. The vibration of the outer tub 33 at the time can be effectively reduced. Moreover, in this Embodiment, since the spring 60c is equipped in the air damper 60, assembly property can be improved.

(実施の形態6)
図13は、本発明の第6の実施の形態における洗濯機の構成を示すものである。図13において、実施の形態1〜5に示した動吸振器41が洗濯機外枠30に固定されている。動吸振器41の弾性係数は、洗濯機外枠30の固有振動数および、洗濯兼脱水槽34の定常時の回転速度に合うように設定されている。
(Embodiment 6)
FIG. 13 shows the configuration of a washing machine according to the sixth embodiment of the present invention. In FIG. 13, the dynamic vibration absorber 41 shown in the first to fifth embodiments is fixed to the washing machine outer frame 30. The elastic coefficient of the dynamic vibration absorber 41 is set so as to match the natural frequency of the washing machine outer frame 30 and the steady rotation speed of the washing and dewatering tub 34.

本発明の第6の実施の形態における洗濯機外枠30の共振周波数は約10Hzであり、洗濯兼脱水槽34の回転速度が、定常状態に達した時の回転周波数は約15Hzである。そこで、動吸振器41の固有振動数を10Hzと、15Hzで切り換えられるように、実施の形態1〜5に示した方法で動吸振器41の弾性係数を調整する。その結果、洗濯機外枠30の共振点における振動および、洗濯兼脱水槽34の回転速度が定常状態に達した時の振動を効果的に低減することができる。   The resonance frequency of the washing machine outer frame 30 in the sixth embodiment of the present invention is about 10 Hz, and the rotation frequency when the rotation speed of the washing and dewatering tub 34 reaches a steady state is about 15 Hz. Therefore, the elastic coefficient of the dynamic vibration absorber 41 is adjusted by the method described in the first to fifth embodiments so that the natural frequency of the dynamic vibration absorber 41 can be switched between 10 Hz and 15 Hz. As a result, the vibration at the resonance point of the washing machine outer frame 30 and the vibration when the rotational speed of the washing and dewatering tub 34 reaches a steady state can be effectively reduced.

以上のように、本発明にかかる洗濯機は、外槽に取り付ける錘に水等の液体を使用しないので、安価で静かに防振性能を向上することができ、洗濯機等の用途に有用である。   As described above, since the washing machine according to the present invention does not use liquid such as water for the weight attached to the outer tub, it can improve vibration-proof performance at a low cost and is useful for uses such as a washing machine. is there.

本発明の実施の形態1における洗濯機の断面図Sectional drawing of the washing machine in Embodiment 1 of this invention 同洗濯機の動吸振器の断面図Sectional view of the dynamic vibration absorber of the washing machine 同洗濯機の動吸振器のモデル図Model diagram of the dynamic vibration absorber of the washing machine 同洗濯機の動吸振器の粘性空気ダンパのモデル図Model diagram of viscous air damper of the dynamic vibration absorber of the washing machine 本発明の実施の形態2における洗濯機の構成図Configuration diagram of washing machine in Embodiment 2 of the present invention 本発明の実施の形態3における動吸振器の断面図Sectional drawing of the dynamic vibration damper in Embodiment 3 of this invention 同洗濯機の外枠を移動させるための駆動装置の構成図The block diagram of the drive device for moving the outer frame of the washing machine 本発明の実施の形態4における洗濯機の動吸振器の断面図Sectional drawing of the dynamic vibration absorber of the washing machine in Embodiment 4 of this invention 同洗濯機の動吸振器の空気ダンパの断面図Cross section of the air damper of the dynamic vibration absorber of the washing machine (a)同洗濯機の動吸振器の減衰力可変装置の側面図(b)同減衰力可変装置の上面図(A) Side view of the damping force varying device of the dynamic vibration absorber of the washing machine (b) Top view of the damping force varying device (a)同洗濯機の動吸振器の減衰力可変装置の空気が流れる状態図(b)同空気が流れない状態図(A) State diagram in which the air of the damping force variable device of the dynamic vibration absorber of the washing machine flows (b) State diagram in which the air does not flow 本発明の実施の形態5における洗濯機の動吸振器の断面図Sectional drawing of the dynamic vibration absorber of the washing machine in Embodiment 5 of this invention 本発明の実施の形態6における洗濯機の断面図Sectional drawing of the washing machine in Embodiment 6 of this invention 従来の洗濯機の断面図Cross section of a conventional washing machine

符号の説明Explanation of symbols

30 洗濯機外枠
33 外槽
33a 外槽下部
34 洗濯兼脱水槽
35 駆動手段
41 動吸振器
42 錘
43 支持ばね
44 空気ダンパ
45 固定部
30 Outer frame of washing machine 33 Outer tub 33a Lower part of outer tub 34 Washing / dehydration tub 35 Driving means 41 Dynamic vibration absorber 42 Weight 43 Support spring 44 Air damper 45 Fixed part

Claims (6)

洗濯機外枠に弾性支持された外槽と、前記外槽内に回転可能に設けられた洗濯兼脱水槽と、前記洗濯兼脱水槽を回転させる駆動手段と、前記外槽に設けた動吸振器とを備え、前記動吸振器は、錘と、前記錘を空気ダンパと支持ばねにより支持する構成とし、前記動吸振器は、前記洗濯兼脱水槽の回転速度により変化する前記外槽の固有振動数に対応するように、前記支持ばねの弾性係数と空気ダンパの減衰力を設定した洗濯機。 An outer tub elastically supported by the outer frame of the washing machine, a washing / dehydrating tub rotatably provided in the outer tub, a driving means for rotating the washing / dehydrating tub, and a dynamic vibration provided in the outer tub The dynamic vibration absorber is configured to support a weight, and the weight by an air damper and a support spring, and the dynamic vibration absorber is unique to the outer tub that changes according to the rotational speed of the washing and dewatering tub. A washing machine in which the elastic coefficient of the support spring and the damping force of the air damper are set so as to correspond to the frequency. 洗濯兼脱水槽の回転速度を検知する速度検知手段を設け、動吸振器は、前記速度検知手段により検知した前記洗濯兼脱水槽の回転速度に応じて、支持ばねの弾性係数が自動的に調整されるようにした請求項1記載の洗濯機。 A speed detecting means for detecting the rotation speed of the washing / dehydrating tub is provided, and the dynamic vibration absorber automatically adjusts the elastic coefficient of the support spring according to the rotation speed of the washing / dehydrating tub detected by the speed detecting means. The washing machine according to claim 1, wherein the washing machine is made. 動吸振器は、外枠を設け、前記外枠に弾性体の一端を固定し、前記弾性体が錘に対して進退自在となるように前記外枠を移動させて、前記弾性体と前記錘が接触、離反する構成とした請求項1または2記載の洗濯機。 The dynamic vibration absorber is provided with an outer frame, one end of an elastic body is fixed to the outer frame, the outer frame is moved so that the elastic body can move forward and backward with respect to the weight, and the elastic body and the weight The washing machine according to claim 1 or 2, wherein the contact and separation are made. 動吸振器は、一対の支持ばねと、減衰力を可変とした空気ダンパを直列に設けて錘を支持する構成とし、前記空気ダンパによる減衰力を調整することにより、前記動吸振器の支持ばねの弾性係数を調整可能とした請求項1または2記載の洗濯機。 The dynamic vibration absorber is configured to support a weight by providing a pair of support springs and an air damper having a variable damping force in series, and by adjusting the damping force by the air damper, The washing machine according to claim 1, wherein the elastic modulus of the washing machine can be adjusted. 動吸振器は、支持ばねと、ばねを内装した空気ダンパを直列に接続して錘を支持する構成とし、前記空気ダンパの減衰力を調整することにより、前記動吸振器の支持ばねの弾性係数を調整可能とした請求項1または2記載の洗濯機。 The dynamic vibration absorber is configured to support a weight by connecting a support spring and an air damper including a spring in series, and by adjusting a damping force of the air damper, an elastic coefficient of the support spring of the dynamic vibration absorber The washing machine according to claim 1, wherein the washing machine is adjustable. 洗濯機外枠に、動吸振器を設けた請求項1〜5のいずれか1項に記載の洗濯機。 The washing machine according to any one of claims 1 to 5, wherein a dynamic vibration absorber is provided on the outer frame of the washing machine.
JP2005247102A 2005-08-29 2005-08-29 Washing machine Pending JP2007061124A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113373644A (en) * 2021-06-29 2021-09-10 无锡小天鹅电器有限公司 Laundry treating apparatus, control method thereof, and storage medium

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Publication number Priority date Publication date Assignee Title
JPH04244196A (en) * 1991-01-28 1992-09-01 Kayaba Ind Co Ltd Drum-type washing machine
JPH04352994A (en) * 1991-05-30 1992-12-08 Matsushita Electric Ind Co Ltd Drum type electric washing machine
JPH08309083A (en) * 1995-05-18 1996-11-26 Sanyo Electric Co Ltd Drum type washing machine
JP2001256762A (en) * 2000-03-09 2001-09-21 Matsushita Electric Ind Co Ltd Disk device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04244196A (en) * 1991-01-28 1992-09-01 Kayaba Ind Co Ltd Drum-type washing machine
JPH04352994A (en) * 1991-05-30 1992-12-08 Matsushita Electric Ind Co Ltd Drum type electric washing machine
JPH08309083A (en) * 1995-05-18 1996-11-26 Sanyo Electric Co Ltd Drum type washing machine
JP2001256762A (en) * 2000-03-09 2001-09-21 Matsushita Electric Ind Co Ltd Disk device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113373644A (en) * 2021-06-29 2021-09-10 无锡小天鹅电器有限公司 Laundry treating apparatus, control method thereof, and storage medium
CN113373644B (en) * 2021-06-29 2024-05-24 无锡小天鹅电器有限公司 Laundry treating apparatus, control method thereof, and storage medium

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