JP6966494B2 - Washing machine - Google Patents

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JP6966494B2
JP6966494B2 JP2019031214A JP2019031214A JP6966494B2 JP 6966494 B2 JP6966494 B2 JP 6966494B2 JP 2019031214 A JP2019031214 A JP 2019031214A JP 2019031214 A JP2019031214 A JP 2019031214A JP 6966494 B2 JP6966494 B2 JP 6966494B2
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water
unit
water level
outer tank
heater
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JP2020130844A (en
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昌 坂東
祐広 秋葉
厚 磯前
隆 黒田
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Hitachi Global Life Solutions Inc
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Hitachi Global Life Solutions Inc
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Description

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

特許文献１には、「洗濯脱水槽内に温水を霧状に噴射する洗濯機において、外部からの水の供給が停止又は不足しているときのヒータの異常加熱を防止する。」と記載されている。 Patent Document 1 describes, "In a washing machine that sprays hot water into a washing / dehydrating tank in the form of mist, abnormal heating of the heater is prevented when the supply of water from the outside is stopped or insufficient." ing.

特開２００６−５１２９３号公報Japanese Unexamined Patent Publication No. 2006-51293

しかし、特許文献１は、ヒータによってある空間に溜められた水を加熱する際に、その空間内にヒータが空焚きしない量の水が存在しているかどうかを水位センサーによって判定し、その水の量がヒータの異常加熱の原因になるかを判断しているため、例えば水位センサーが故障した場合や水位センサー水位検知信号を正しく発信できなくなった場合(たとえば異物の発生による水位読取値の誤差等)、このような判断が適切になされず、ヒータが空焚き状態で加熱し、最悪製品の発火に至る可能性があった。 However, in Patent Document 1, when the water stored in a certain space is heated by the heater, it is determined by the water level sensor whether or not the amount of water that the heater does not burn is present in the space, and the water is determined. Since it is determined whether the amount causes abnormal heating of the heater, for example, when the water level sensor fails or when the water level sensor water level detection signal cannot be transmitted correctly (for example, an error in the water level reading due to the generation of foreign matter, etc.) ), Such a judgment was not made properly, and the heater was heated in an empty-fired state, which could lead to ignition of the worst product.

そこで、本発明は、水位検知部が正しく動作しない場合でも水加熱部の異常加熱を適切に防止可能な洗濯機を提供することを目的とする。 Therefore, an object of the present invention is to provide a washing machine capable of appropriately preventing abnormal heating of the water heating unit even when the water level detecting unit does not operate correctly.

このような課題を解決するために、例えば、本発明に係る洗濯機は、水を溜める外槽と、外槽内に回転自在に支持され、衣類が収容される内槽と、外槽内に給水する給水部と、外槽内に給水された水を加熱する水加熱部と、外槽内の水位を検知する水位検知部と、外槽内の所定区間の電導度を測定する電導度測定部と、水位検知部及び電導度測定部を制御する制御部と、を有し、制御部は、水位検知部の検知結果によって水位が所定水位以上であることを判定し、かつ、電導度測定部の検出結果が所定の閾値以上であると判定した場合に水加熱部の加熱開始を制御する構成とする。 In order to solve such a problem, for example, the washing machine according to the present invention has an outer tub for storing water, an inner tub rotatably supported in the outer tub and accommodating clothes, and an outer tub. A water supply unit that supplies water, a water heating unit that heats the water supplied in the outer tank, a water level detection unit that detects the water level in the outer tank, and an electric conductivity measurement that measures the electrical conductivity of a predetermined section in the outer tank. It has a unit and a control unit that controls a water level detection unit and an electric conductivity measuring unit, and the control unit determines that the water level is equal to or higher than a predetermined water level based on the detection result of the water level detecting unit, and measures the electric conductivity. The configuration is such that the start of heating of the water heating unit is controlled when it is determined that the detection result of the unit is equal to or higher than a predetermined threshold value.

本発明によれば、水位検知部が正しく動作しない場合でも水加熱部の異常加熱を適切に防止可能な洗濯機を提供することができる。 According to the present invention, it is possible to provide a washing machine capable of appropriately preventing abnormal heating of the water heating unit even when the water level detecting unit does not operate correctly.

本発明に係るドラム式洗濯乾燥機を示す外観斜視図である。It is an external perspective view which shows the drum type washer-dryer which concerns on this invention. 図１のドラム式洗濯乾燥機の縦断面の内部構造を示す側面図である。It is a side view which shows the internal structure of the vertical cross section of the drum type washer-dryer of FIG. 本発明に係るドラム式洗濯乾燥機のヒータの一構造例を示す図である。It is a figure which shows one structural example of the heater of the drum type washer-dryer which concerns on this invention. 図１のドラム式洗濯乾燥機の外槽底面付近の構造を示す斜視図である。It is a perspective view which shows the structure near the bottom surface of the outer tub of the drum type washer-dryer of FIG. 図１のドラム式洗濯乾燥機の洗濯工程の流れを示すフローチャートである。It is a flowchart which shows the flow of the washing process of the drum type washer-dryer of FIG. 図５の前洗い工程の制御処理の流れを示すフローチャートである。It is a flowchart which shows the flow of the control process of the pre-washing process of FIG. 図５の本洗い工程Ａの制御処理の流れを示すフローチャートである。It is a flowchart which shows the flow of the control process of the main washing process A of FIG. 図５の本洗い工程Ｂの制御処理の流れを示すフローチャートである。It is a flowchart which shows the flow of the control process of the main washing process B of FIG.

次に、本発明の実施形態のドラム式洗濯乾燥機について、適宜図面を参照しながら詳細に説明する。 Next, the drum-type washer-dryer according to the embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

まず、主に図１及び図２を参照しながらドラム式洗濯乾燥機の全体構成について説明する。図１は、本実施形態のドラム式洗濯乾燥機を示す外観斜視図である。図２は、図１のドラム式洗濯乾燥機の筐体の側板を外してその内部構造を概略的に示す側面図である。以下の説明における前後上下左右の方向は、図１に示す前後上下左右の方向を基準とする。 First, the overall configuration of the drum-type washer-dryer will be described mainly with reference to FIGS. 1 and 2. FIG. 1 is an external perspective view showing a drum-type washer-dryer of the present embodiment. FIG. 2 is a side view schematically showing the internal structure of the drum-type washer-dryer housing of FIG. 1 with the side plates removed. The front-back, up-down, left-right directions in the following description are based on the front-back, up-down, left-right directions shown in FIG.

外郭を構成する筐体１は、ベース４の上に取り付けられており、左右の側板６、前面カバー５、背面カバー２、上面カバー７、で構成されている。前面カバー５は上部前面カバー５ａと下部前面カバー５ｂで構成されている。左右の側板６は、コの字型の上補強材、前補強材、後補強材（いずれも図示せず）で結合しており、ベース４を含めて箱状の筐体１を形成している。 The housing 1 constituting the outer shell is mounted on the base 4, and is composed of left and right side plates 6, a front cover 5, a back cover 2, and a top cover 7. The front cover 5 is composed of an upper front cover 5a and a lower front cover 5b. The left and right side plates 6 are connected by a U-shaped upper reinforcing material, a front reinforcing material, and a rear reinforcing material (none of which are shown) to form a box-shaped housing 1 including the base 4. There is.

前面カバー５の略中央に設けた衣類を出し入れするための投入口を塞ぐドア３で、前補強材に設けたヒンジ(図示せず)で開閉可能に支持されている。取っ手３aを引くことでロック機構（図示せず）が外れて開き、ドア３を前面カバー５に押し付けることでロックされて閉じる。前補強材は、後記する外槽１５の開口部と同心に、衣類を出し入れするための円形の開口部を有している。 A door 3 provided in the substantially center of the front cover 5 for closing an inlet for putting in and taking out clothes, and is supported by a hinge (not shown) provided on the front reinforcing material so as to be openable and closable. By pulling the handle 3a, the lock mechanism (not shown) is released and opened, and by pressing the door 3 against the front cover 5, the door 3 is locked and closed. The front reinforcing material has a circular opening for putting in and taking out clothes concentrically with the opening of the outer tank 15 described later.

筐体１の上部中央に設けた操作パネル８は、電源スイッチ８aと、操作ボタン８bと、を備え、筐体１の上部に設けた制御部である制御装置２７と電気的に接続している。 The operation panel 8 provided in the center of the upper part of the housing 1 includes a power switch 8a and an operation button 8b, and is electrically connected to a control device 27 which is a control unit provided in the upper part of the housing 1. ..

筐体１内の上部左側に設けた洗剤容器１３は、洗濯する際に筐体上部から洗剤類を投入する際に用いられる。洗剤類を入れる場合は、洗剤蓋９を開ける。また、洗剤容器１３の左側面のやや後方に出水口１３ａを有している。従って、洗剤容器１３の底面は出水口１３ａの位置が最も低くなるようなすり鉢状に形成されている。 The detergent container 13 provided on the upper left side in the housing 1 is used when detergents are poured from the upper part of the housing when washing. To put detergents, open the detergent lid 9. Further, the water outlet 13a is provided slightly behind the left side surface of the detergent container 13. Therefore, the bottom surface of the detergent container 13 is formed in a mortar shape so that the position of the water outlet 13a is the lowest.

洗剤容器１３の後側には、給水電磁弁１１、風呂水吸水ポンプ１２、水位センサー２５等の給水関連部品が設けられている。洗剤容器１３の上部開口には、給水部である給水ユニット１０を備える。上面カバー７には、水道栓からの給水ホース接続口１１ａ、風呂の残り湯の吸水ホース接続口１２ａが設けられている。 Water supply-related parts such as a water supply solenoid valve 11, a bath water absorption pump 12, and a water level sensor 25 are provided on the rear side of the detergent container 13. The upper opening of the detergent container 13 is provided with a water supply unit 10 which is a water supply unit. The upper surface cover 7 is provided with a water supply hose connection port 11a from a water tap and a water absorption hose connection port 12a for the remaining hot water of the bath.

回転可能に支持された円筒状の洗濯兼脱水槽であるドラム１４（内槽）は、その外周壁及び底壁に通水及び通風のための多数の貫通孔（図示省略）を有し、前側端面には、衣類を出し入れするための開口部（図示省略）が設けられている。 The drum 14 (inner tank), which is a rotatably supported cylindrical washing / dehydrating tank, has a large number of through holes (not shown) in its outer peripheral wall and bottom wall for water passage and ventilation, and is on the front side. The end face is provided with an opening (not shown) for putting in and taking out clothes.

その開口部の外側にはドラム１４と一体の流体バランサ１４ｂを備えている。この流体バランサ１４ｂは合成樹脂などでリング状に形成され、内部に比重の大きな流体(塩水など)を封入して構成され、ドラム１４の回転時に洗濯物の偏りなどによって偏心が生じたときに、流体バランサ１４ｂ内での流体の移動によって偏心を打ち消し、回転のバランスを維持する機能を有している。また、ドラム１４の回転中心軸は、水平又は開口部側が高くなるように傾斜している。 A fluid balancer 14b integrated with the drum 14 is provided on the outside of the opening. This fluid balancer 14b is formed in a ring shape made of synthetic resin or the like, and is configured by enclosing a fluid having a large specific gravity (salt water or the like) inside. It has a function of canceling the eccentricity by moving the fluid in the fluid balancer 14b and maintaining the balance of rotation. Further, the rotation center axis of the drum 14 is inclined so as to be horizontal or higher on the opening side.

円筒状の外槽１５は、ドラム１４を同軸上に内包し、前面は開口し、後側端面の外側中央にはモータ１８が取り付けられる。モータ１８の回転軸は、外槽１５を貫通し、ドラム１４と結合している。前面の開口部には、外槽１５内への貯水を可能にする外槽カバー１６が設けられている。外槽１５は、下側をベース４に固定されたダンパ１７で防振支持されている。また、ゴム製のベローズ１９は、ドア３を閉じることで外槽１５を水封する。 The cylindrical outer tank 15 includes the drum 14 coaxially, the front surface is open, and the motor 18 is attached to the outer center of the rear end surface. The rotating shaft of the motor 18 penetrates the outer tank 15 and is coupled to the drum 14. An outer tank cover 16 that allows water to be stored in the outer tank 15 is provided at the opening on the front surface. The outer tank 15 is vibration-proof supported by a damper 17 whose lower side is fixed to the base 4. Further, the rubber bellows 19 seals the outer tank 15 with water by closing the door 3.

外槽１５の側面後部には、外槽１５内へ水や洗剤類を供給する給水口１５ａが設けられている。給水口１５ａと洗剤容器１３の出水口１３ａとは、ゴム製の蛇腹ホース２０で接続されている。外槽１５の底側内周面には、凹状の窪み部１５ｂが外槽１５の軸方向に延在するように設けられている。この窪み部１５ｂの底面は、前側から後側に下がる傾斜面になっており、窪み部１５ｂの後側には排水口２１が設けられている。排水口２１には継手２１ａを介して蛇腹ホース２２が接続され、循環ポンプ２３に接続されている。 At the rear of the side surface of the outer tank 15, a water supply port 15a for supplying water and detergents into the outer tank 15 is provided. The water supply port 15a and the water outlet 13a of the detergent container 13 are connected by a rubber bellows hose 20. A concave recess 15b is provided on the bottom inner peripheral surface of the outer tank 15 so as to extend in the axial direction of the outer tank 15. The bottom surface of the recessed portion 15b is an inclined surface that descends from the front side to the rear side, and a drainage port 21 is provided on the rear side of the recessed portion 15b. A bellows hose 22 is connected to the drain port 21 via a joint 21a and is connected to the circulation pump 23.

循環ポンプ２３は外槽１５底部にたまった洗剤水を循環経路(図示せず)を介して外槽カバー１６上部に設けられたシャワー吹き出し口２３ａより噴出させることで高濃度の洗剤水を洗濯物全体にいきわたらせることで洗浄力と節水性を両立している。 The circulation pump 23 ejects the detergent water accumulated at the bottom of the outer tub 15 from the shower outlet 23a provided on the upper part of the outer tub cover 16 via a circulation path (not shown) to discharge high-concentration detergent water to the laundry. By spreading it throughout, it has both detergency and water saving.

また、排水ホース２４は、循環ポンプ２３の出水ポート部に設けられた排水弁２４ａにその一端が接続され、その他端側は機外に延出している。 Further, one end of the drain hose 24 is connected to a drain valve 24a provided at the drain port portion of the circulation pump 23, and the other end side extends to the outside of the machine.

水位検知部である水位センサー２５はビニール製のチューブ２６で外槽１５の底部に接続され、外槽１５内の圧力を測定することで水位を検知する。 The water level sensor 25, which is a water level detection unit, is connected to the bottom of the outer tank 15 by a vinyl tube 26, and detects the water level by measuring the pressure inside the outer tank 15.

制御部である制御装置２７は電導度測定部を有し、水位検知部と電導度測定部を制御する。この電導度測定部は、外槽１５の内底部に配置された電導度センサー２８を介して、給水された水の電導度（硬度）を検出する。 The control device 27, which is a control unit, has an electric conductivity measuring unit, and controls the water level detecting unit and the electric conductivity measuring unit. The conductivity measuring unit detects the conductivity (hardness) of the supplied water via the conductivity sensor 28 arranged at the inner bottom of the outer tank 15.

外槽底面部には水加熱部であるヒータ２９が搭載され、外槽１５内部の洗濯水を加熱することで、洗濯水の洗剤溶け残りを減らし、また洗濯水に溶けている洗剤の酵素の働きを促進し、洗浄性能を向上させることができる。また、加熱部２９ａ近傍部には後述するサーミスタ２９ｂが温度検知手段として設けられている。 A heater 29, which is a water heating unit, is mounted on the bottom surface of the outer tub, and by heating the washing water inside the outer tub 15, the amount of undissolved detergent in the washing water is reduced, and the detergent enzyme dissolved in the washing water is used. It can promote the work and improve the cleaning performance. Further, a thermistor 29b, which will be described later, is provided as a temperature detecting means in the vicinity of the heating portion 29a.

本発明では、制御部である制御装置２７は、水位検知部の検知結果及び電導度測定部の測定結果に基づいて、水加熱部の加熱開始を制御するようにする。これは、例え、水位検知部が動作されていないような状態であっても電導度測定部により水位を検知することができ、水加熱部が水に浸っていない状態、つまり水加熱部が空焚き状態での異常加熱を防ぐ、すなわち二重の空焚き防止機構を実現し、より製品の安全性を高めることができる。 In the present invention, the control device 27, which is a control unit, controls the start of heating of the water heating unit based on the detection result of the water level detection unit and the measurement result of the conductivity measurement unit. This means that the water level can be detected by the conductivity measuring unit even when the water level detecting unit is not operating, and the water heating unit is not submerged in water, that is, the water heating unit is empty. It is possible to prevent abnormal heating in the heating state, that is, to realize a double dry heating prevention mechanism, and to further improve the safety of the product.

電導度センサー２８は図４に示すように、２枚の電極２８ａが対向して配置されており、それらの電極２８ａ間の電気抵抗値を測定することで電気伝導度を算出する。そのため、電極間に存在している水の電気伝導度を測定することで水の硬度などを検知する手段として用いられる。そのほかにも、水と空気の電気抵抗値の違いを利用して、外槽１５内部の水の有無を判別する手段として用いたり、水の電気伝導度の変化を測定することで洗剤液の洗剤濃度や洗剤液中の汚れ濃度を検知したりすることができる。 As shown in FIG. 4, in the conductivity sensor 28, two electrodes 28a are arranged to face each other, and the electrical conductivity is calculated by measuring the electric resistance value between the electrodes 28a. Therefore, it is used as a means for detecting the hardness of water by measuring the electrical conductivity of water existing between the electrodes. In addition, it can be used as a means to determine the presence or absence of water inside the outer tank 15 by utilizing the difference in electrical resistance between water and air, or by measuring changes in the electrical conductivity of water to make a detergent solution. It is possible to detect the concentration and the dirt concentration in the detergent solution.

図３にヒータ２９の構造を示す。ヒータ２９は槽内の水を加熱するための加熱部２９ａと、温度制御時の槽内温度を検知するためのサーミスタ２９ｂと、外槽の水封をするためのゴムパッキン２９ｃと、ヒータ２９を外槽１５に取り付けるためのフランジ２９ｄおよびフランジ２９ｅとネジ２９ｆとナット２９ｇで構成されており、ネジ２９ｆはフランジ２９ｄに加締めにより固定されている。 FIG. 3 shows the structure of the heater 29. The heater 29 includes a heating unit 29a for heating the water in the tank, a thermistor 29b for detecting the temperature inside the tank during temperature control, a rubber packing 29c for sealing the water in the outer tank, and a heater 29. It is composed of a flange 29d for attaching to the outer tank 15, a flange 29e, a screw 29f, and a nut 29g, and the screw 29f is fixed to the flange 29d by crimping.

外槽１５に設けられた、ゴムパッキン２９ｃと相似形状かつ一回り大きい穴(図示せず)にフランジ２９ｅと外槽１５が接するまでヒータ２９を挿入した状態でナット２９ｇを締めるとネジ２９ｆとナット２９ｇによりフランジ２９ｄとフランジ２９ｅの距離が狭まり、間のゴムパッキン２９ｃがヒータ２９長手方向に圧縮され長手方向と直角方向全面に向かってに膨らむことで外槽１５の穴に押しつけ力を作用し、水封とヒータ２９の固定を行う。 When the nut 29g is tightened with the heater 29 inserted until the flange 29e and the outer tank 15 come into contact with the hole (not shown) that has a shape similar to that of the rubber packing 29c and is slightly larger than that provided in the outer tank 15, the screw 29f and the nut The distance between the flange 29d and the flange 29e is narrowed by 29 g, and the rubber packing 29c between them is compressed in the longitudinal direction of the heater 29 and swells toward the entire surface in the direction perpendicular to the longitudinal direction, thereby exerting a pressing force on the hole of the outer tank 15. Seal the water and fix the heater 29.

加熱部２９ａは金属管内部にコイル状に巻かれた電熱線２９ｈが通され、その電熱線２９ｈの周りを絶縁性の粉末(図示せず)で覆い、電熱線２９ｈの固定および金属管と電熱線２９ｈとの絶縁を行っている。電熱線２９ｈの両端には温度ヒューズ(図示せず)が設けられ、ヒータ２９自体が異常加熱によって過剰に温度上昇した場合にヒューズが溶断し、強制的に電源を遮断する構造となっている。 A coiled heating wire 29h is passed through the heating portion 29a inside the metal tube, and the heating wire 29h is covered with an insulating powder (not shown) to fix the heating wire 29h and to connect the metal tube and electricity. It is insulated from the heat ray 29h. Thermal fuses (not shown) are provided at both ends of the heating wire 29h, and the fuse is blown when the temperature of the heater 29 itself rises excessively due to abnormal heating, forcibly shutting off the power supply.

図４に外槽底部の構造を示す。電導度センサー２８はヒータ２９に対して水平高さで見て高い位置に取り付けられており、電導度センサー２８で水があると判定されれば、ヒータ２９全体が水につかる高さまで水がたまった状態となり、ヒータの空焚き状態を防止することができる構造となっている。また、外槽１５底面部にはステンレス製のヒータカバー３０が取り付けられており、仮にセンサー類が一切働かずにヒータが空焚きの状態となっても、周辺部品へ延焼することが無いような構造となっている。 FIG. 4 shows the structure of the bottom of the outer tank. The conductivity sensor 28 is attached at a position higher than the heater 29 when viewed at a horizontal height, and if the conductivity sensor 28 determines that there is water, the water has accumulated to a height at which the entire heater 29 is submerged in water. It has a structure that can prevent the heater from being heated in the empty state. Further, a stainless steel heater cover 30 is attached to the bottom surface of the outer tank 15, so that even if the sensors do not work at all and the heater is in an empty state, the fire does not spread to peripheral parts. It has a structure.

図５に本実施形態における温水を用いた洗濯運転の制御フローを示す。 FIG. 5 shows a control flow of a washing operation using hot water in the present embodiment.

まず洗濯機の運転を開始するとＳ１のセンシング工程で、ドラム１４が連結されたモータ１８によって回転され、その際のモータ１８の電流を測定することでドラム１４内に投入された洗濯衣類の量を測定し、運転中の使用水量やドラム１４の回転制御内容を決定する。 First, when the operation of the washing machine is started, in the sensing process of S1, the drum 14 is rotated by the connected motor 18, and the current of the motor 18 at that time is measured to measure the amount of laundry clothes put into the drum 14. The measurement is performed to determine the amount of water used during operation and the rotation control content of the drum 14.

その後Ｓ２の給水工程にて給水電磁弁１１が開き、給水部である給水ユニット１０を介して外槽１５内への給水を行い、ステップＳ２０１にて外槽１５内にたまる水の水位を外槽にチューブでつながれた水位検知部である水位センサー２５を用いて水位を検知し、一定時間内に一定水位まで達しない場合は給水電磁弁１１や排水弁２４ａに異常があるものとして運転を停止し、ブザーや操作パネル８上でエラーを放置し使用者への異常を報知する。一定水位まで達した後は給水電磁弁１１が閉じて自動で給水が停止し、洗い工程へと遷移する。 After that, in the water supply process of S2, the water supply solenoid valve 11 opens, water is supplied into the outer tank 15 via the water supply unit 10 which is a water supply unit, and the water level of the water accumulated in the outer tank 15 is set in the outer tank in step S201. The water level is detected using the water level sensor 25, which is a water level detection unit connected to the tube, and if the water level does not reach a certain level within a certain period of time, the operation is stopped because the water supply solenoid valve 11 or the drain valve 24a is considered to be abnormal. , The error is left on the buzzer or the operation panel 8 to notify the user of the abnormality. After reaching a certain water level, the water supply solenoid valve 11 closes and the water supply is automatically stopped, and the process proceeds to the washing process.

洗い工程は、Ｓ３の前洗い工程とＳ４、Ｓ５の本洗い工程とに分類され、前洗い工程Ｓ３では、図６に示す通り、ステップＳ３０１で少量の水に洗剤を溶かした高濃度洗剤液を作成し（洗剤溶かし工程）、ステップＳ３０２で循環ポンプ２３にて槽内の衣類全体に高濃度洗剤液を散布し（循環水散布工程）、浸透させる。その後ステップＳ３０３で再度給水して槽内に水をためた（給水工程）後、ステップＳ３０４でドラムの回転数を一定以上に上げることで遠心力によりドラム１４内面に衣類を張り付かせた状態でシャワーを散布することで洗浄する押し洗い工程を実施する。 The washing step is classified into a pre-washing step of S3 and a main washing step of S4 and S5. In the pre-washing step S3, as shown in FIG. The detergent is prepared (detergent melting step), and in step S302, the high-concentration detergent solution is sprayed on the entire clothes in the tank by the circulation pump 23 (circulating water spraying step) and permeated. After that, water is supplied again in step S303 to store water in the tank (water supply step), and then in step S304, the rotation speed of the drum is increased to a certain level or higher so that the clothes are attached to the inner surface of the drum 14 by centrifugal force. Perform a push-washing process to wash by spraying a shower.

その後はＳ４の本洗い工程Ａに推移し、図７に示す通り、ステップＳ４０１で追加給水を行い、水位センサー２５により水位がリセット水位Tr以上であることを判定したのちに、ステップＳ４０２で電導度センサー２８の値を読取り、それが一定（所定の閾値）以上であると次工程（ステップＳ４０３）に移行し、その時点で電導度センサー２８の読取り値が規定以下であった場合は以降の本洗い工程におけるヒータ制御のステップをスキップし、ヒータ２９を用いずに本洗い工程Ａを規定時間まで実施し、その後Ｓ５の本洗い工程Ｂへ遷移する。 After that, the process proceeds to the main washing step A of S4, additional water is supplied in step S401 as shown in FIG. 7, the water level sensor 25 determines that the water level is equal to or higher than the reset water level Tr, and then the electric conductivity in step S402. The value of the sensor 28 is read, and if it is equal to or higher than a certain value (predetermined threshold value), the process proceeds to the next step (step S403). The step of heater control in the washing step is skipped, the main washing step A is carried out until the specified time without using the heater 29, and then the transition to the main washing step B of S5.

ステップＳ４０３でヒータ２９をＯＮし、続くステップＳ４０４では電流値を測定し、予め定めた規定値以上の電流値が流れるかを判定する。この段階で電流値が規定値以下である場合はヒータ２９が断線していると判断し、その後のヒータ２９を用いた温水洗浄の工程をスキップし、ヒータ２９を用いずに本洗い工程Ａを規定時間まで実施し、その後Ｓ５の本洗い工程Ｂへ遷移する。 The heater 29 is turned on in step S403, and the current value is measured in the following step S404 to determine whether or not a current value equal to or higher than a predetermined predetermined value flows. If the current value is less than or equal to the specified value at this stage, it is determined that the heater 29 is disconnected, the subsequent step of hot water washing using the heater 29 is skipped, and the main washing step A is performed without using the heater 29. It is carried out until the specified time, and then the process proceeds to the main washing step B of S5.

ステップＳ４０４ではシーズヒータ導通時の電流値が規定値以上であればヒータ２９が断線や接続端子のはずれなどなく、正常に接続された状態であると判定し、次のステップＳ４０５に遷移し、ヒータ２９をＯＦＦにした後、ステップＳ４０６でヒータ２９ＯＦＦ状態での電流値を測定し、電流の値が規定値未満になっているかを判定する。この際、電流値が規定値以上の場合はヒータ２９の制御回路がショートしていると判定され、安全のために一連の動作を終了し、本体の電源をＯＦＦにする。 In step S404, if the current value when the sheathed heater is conducting is equal to or higher than the specified value, it is determined that the heater 29 is in a normally connected state without disconnection or disconnection of the connection terminal, and the process proceeds to the next step S405, and the heater is transferred to. After turning off 29, the current value in the heater 29 OFF state is measured in step S406, and it is determined whether the current value is less than the specified value. At this time, if the current value is equal to or higher than the specified value, it is determined that the control circuit of the heater 29 is short-circuited, a series of operations are terminated for safety, and the power supply of the main body is turned off.

その後ステップＳ４０７の撹拌動作後にステップＳ４０８で水位センサー２５の数値読取りを行い、その時の水位がリセット水位Trより低い場合はステップＳ４０９の給水を実施する。尚、水位がリセット水位Trより高い場合はステップＳ４０９給水動作をスキップし、ステップＳ４１０の撹拌動作へ移行する。これらステップＳ４０８からＳ４１０までの工程の後、ステップＳ４１１にて規定時間が経過しているかを判定し、規定時間に満たない場合はステップＳ４０８の水位判定まで戻り、これを規定時間経過まで繰り返すことで衣類の洗浄を行う。これらの工程はヒータ２９をＯＮしない常温での洗浄を行う。 After that, after the stirring operation in step S407, the numerical value of the water level sensor 25 is read in step S408, and if the water level at that time is lower than the reset water level Tr, water supply in step S409 is performed. If the water level is higher than the reset water level Tr, the water supply operation in step S409 is skipped and the process proceeds to the stirring operation in step S410. After these steps from steps S408 to S410, it is determined in step S411 whether the specified time has elapsed, and if it is less than the specified time, the process returns to the water level determination in step S408, and this is repeated until the specified time elapses. Wash clothes. In these steps, cleaning is performed at room temperature without turning on the heater 29.

その後本洗い工程Ｂ(Ｓ５)へ遷移すると、図８に示す通り、まずステップＳ５０１で水位センサー２５の読取値がリセット水位Tr以上であるかを判定し、リセット水位Tr以上の水位である場合には、次のステップＳ５０２にて電導度センサー２８の値を測定し、閾値以上であるかを判定する。リセット水位Tr未満であった場合にはステップＳ５０３に遷移し、槽内の水位がリセット水位Tr以上になるまで給水される。 After that, when the transition to the main washing step B (S5) occurs, as shown in FIG. 8, first, in step S501, it is determined whether the reading value of the water level sensor 25 is equal to or higher than the reset water level Tr, and when the water level is equal to or higher than the reset water level Tr. Measures the value of the conductivity sensor 28 in the next step S502, and determines whether or not the value is equal to or greater than the threshold value. If it is less than the reset water level Tr, the process proceeds to step S503, and water is supplied until the water level in the tank becomes equal to or higher than the reset water level Tr.

ステップＳ５０２にて電導度センサー２８の値が閾値未満である場合は水位センサー２５の故障等で実際の水位はヒータ２９の加熱部２９ａが露出する高さまで下がっていると判断し、ヒータ２９を用いない通常の洗濯工程へ遷移する。電導度センサー２８の読取り値が閾値以上であれば、ヒータ２９が完全に水没しているため、安全な状態でヒータ２９による加熱が可能であると判定され、次のステップＳ５０４へ遷移する。 If the value of the conductivity sensor 28 is less than the threshold value in step S502, it is determined that the actual water level has dropped to the height at which the heating portion 29a of the heater 29 is exposed due to a failure of the water level sensor 25 or the like, and the heater 29 is used. Not transition to the normal washing process. If the reading value of the conductivity sensor 28 is equal to or higher than the threshold value, it is determined that the heater 29 can be heated in a safe state because the heater 29 is completely submerged, and the process proceeds to the next step S504.

つまり、水位センサー２５によってドラム１４内にヒータ２９が完全に水没する水量まで給水されたことを検知したことに加え、電導度センサー２８によって所定の高さまで水位が上がったことを検知した上でヒータ２９によりドラム１４内の水の加熱を開始するように制御する。このように制御することで、水位センサー２５が何らかの異常で検知した値が間違っていた場合でも、電導度センサー２８の測定結果を見ることが出来、ヒータ空焚きを抑止することができる。 That is, in addition to detecting that the water level sensor 25 has supplied water to the amount of water that the heater 29 is completely submerged in the drum 14, the electric conductivity sensor 28 detects that the water level has risen to a predetermined height, and then the heater. 29 controls to start heating the water in the drum 14. By controlling in this way, even if the value detected by the water level sensor 25 due to some abnormality is incorrect, the measurement result of the conductivity sensor 28 can be seen, and the heater can be suppressed from being heated.

ステップＳ５０４ではサーミスタ２９ｂにより水温を読取り、設定温度TL以下であればステップＳ５０５でヒータ２９をＯＮし、水温を上昇させる。その後、ステップＳ５０５にて、同じくサーミスタ２９ｂにて水温を計測し、設定温度TH以下であった場合はステップＳ５０７へ遷移し、ヒータＯＮ状態を保ったまま撹拌を規定時間ta(たとえば３分間)継続し、規定時間ta経過後にステップＳ５０８へ遷移し、本洗い工程の運転時間を終了しているかを判定し、運転時間を終了していない場合はステップＳ５０６へ戻り再度サーミスタ２９ｂによる水温判定を実施する。 In step S504, the water temperature is read by the thermistor 29b, and if the temperature is TL or less, the heater 29 is turned on in step S505 to raise the water temperature. After that, in step S505, the water temperature is also measured by the thermistor 29b, and if the temperature is TH or less than the set temperature, the transition to step S507 is performed, and stirring is continued for a specified time ta (for example, 3 minutes) while the heater is kept ON. Then, after the lapse of the specified time ta, the process proceeds to step S508, and it is determined whether or not the operation time of the main washing process has been completed. If the operation time has not been completed, the process returns to step S506 and the water temperature determination by the thermistor 29b is performed again. ..

ステップＳ５０８の時点で本洗い工程Ｂの運転時間を経過している場合はステップＳ５０９にてヒータ２９をＯＦＦにした後、次工程であるすすぎ工程Ｓ６へ移る。 If the operation time of the main washing step B has elapsed at the time of step S508, the heater 29 is turned off in step S509, and then the process proceeds to the next step, the rinsing step S6.

ステップＳ５０６にてサーミスタ２９ｂの検知温度が設定温度THより高い場合はステップＳ５１０に遷移し、ヒータ２９をＯＦＦにした後、ステップＳ５１１にて規定時間taだけ撹拌動作を継続した後、ステップＳ５１２にて本洗い工程Ｂの運転時間が終了したかを判定する。運転時間が終了したと判定された場合はそのまますすぎ工程Ｓ６へと遷移し、運転時間が終了していないと判定された場合はステップＳ５０１に戻り、再度水位センサー２５と電導度センサー２８による水位検知を行い、以下本洗い工程Ｂの運転時間終了まで各ステップを繰り返す。 If the detection temperature of the thermistor 29b is higher than the set temperature TH in step S506, the process proceeds to step S510, the heater 29 is turned off, the stirring operation is continued for a specified time ta in step S511, and then in step S512. It is determined whether the operation time of the main washing step B is completed. If it is determined that the operation time has ended, the process proceeds to the rinsing step S6 as it is, and if it is determined that the operation time has not ended, the process returns to step S501, and the water level is detected again by the water level sensor 25 and the conductivity sensor 28. Then, each step is repeated until the end of the operation time of the main washing step B.

ステップＳ５０４にて検知された水温が設定温度TLより高かった場合はヒータＯＦＦ状態を保ったままステップＳ５１１に遷移して、それ以降は前述のとおりである。この時、設定温度TLとTHの関係をTL＜THとなるように設定し、前述のＳ５０１〜Ｓ５１２のステップを繰り返すことで、シーズヒータのようなヒータ２９により槽内に溜められた水の水温が設定温度THを超えるまで加熱され、設定温度THを超えるとヒータ２９がＯＦＦ状態になり、その後槽内の水の水温が下がって設定温度TLより低くなるとヒータ２９がＯＮ状態になり加熱が再開される。この動作を本洗いＢ運転時間終了まで繰り返し、温水による衣類の洗浄を行うことで、洗濯物の洗浄力を高める。 If the water temperature detected in step S504 is higher than the set temperature TL, the transition to step S511 is performed while maintaining the heater OFF state, and the rest is as described above. At this time, by setting the relationship between the set temperature TL and TH so that TL <TH and repeating the steps S501 to S512 described above, the water temperature of the water stored in the tank by the heater 29 such as a sheathed heater is repeated. Is heated until it exceeds the set temperature TH, and when the set temperature TH is exceeded, the heater 29 is turned off, and then when the water temperature in the tank drops and becomes lower than the set temperature TL, the heater 29 is turned on and heating resumes. Will be done. This operation is repeated until the end of the main washing B operation time, and the clothes are washed with warm water to enhance the washing power of the laundry.

すすぎ工程Ｓ６では中間脱水動作（図示せず）としてドラム１４を高速で回転し、洗濯物にしみ込んだ洗濯液が槽の回転遠心力により絞り出され、排水経路から機外に排水される。中間脱水と給水動作を設定回数繰り返すことで、衣類中に含まれる洗剤成分を水分とともに飛散させて除去する。 In the rinsing step S6, the drum 14 is rotated at high speed as an intermediate dehydration operation (not shown), and the washing liquid soaked in the laundry is squeezed out by the rotational centrifugal force of the tub and drained to the outside of the machine from the drainage path. By repeating the intermediate dehydration and water supply operation a set number of times, the detergent components contained in the clothes are scattered and removed together with the water.

その後脱水工程Ｓ７へ遷移し、ドラム１４を高速で回転させることで衣類中の水分を飛散させ、除去する。 After that, the process proceeds to the dehydration step S7, and the drum 14 is rotated at high speed to disperse and remove the moisture in the clothes.

洗濯乾燥運転を設定している場合はその後、乾燥工程Ｓ８を実行し、洗濯物を乾かす。 If the washing / drying operation is set, then the drying step S8 is executed to dry the laundry.

動作終了後一連の運転制御を終了する。 After the operation is completed, a series of operation control is terminated.

以上の制御を実施することで、本実施形態の洗濯機では水位検知部（水位センサー２５）による水位検知制御に加え、電動度測定部（電導度センサー２８）による水位検知制御を行い、電導度センサー２８の読み取り値が規定値以下の場合、すなわち水位が規定より低い場合はヒータ２９をＯＦＦ状態で本洗い工程を実施することで、ヒータ空焚き状態での異常加熱を防ぐ、すなわち二重の空焚き防止機構を実現し、より製品の安全性を高めることができる。 By performing the above control, in the washing machine of the present embodiment, in addition to the water level detection control by the water level detection unit (water level sensor 25), the water level detection control by the electric degree measuring unit (electricity sensor 28) is performed, and the electric conductivity is performed. When the reading value of the sensor 28 is less than or equal to the specified value, that is, when the water level is lower than the specified value, the main washing step is performed with the heater 29 turned off to prevent abnormal heating in the heater empty heating state, that is, double. It is possible to realize a mechanism to prevent empty heating and further improve the safety of the product.

尚、本実施形態では、ドラム式洗濯乾燥機を用いて説明したが、本発明の趣旨の範囲でセンサーとヒータの配置や制御内容を変更することで、いわゆるタテ型洗濯乾燥機や乾燥機構を有さない洗濯機にも本発明を適用することが出来る。 In the present embodiment, the drum-type washer-dryer has been described, but by changing the arrangement and control contents of the sensor and the heater within the scope of the present invention, a so-called vertical washer-dryer and a drying mechanism can be obtained. The present invention can be applied to a washing machine that does not have one.

また、本実施形態では、水位を検知する手段として電導度センサー２８を用いて外槽内の水の電導度を測定する方式を用いて説明したが、例えばフロートと機械的スイッチを組み合わせて水位を検知する手段を用いてもよい。 Further, in the present embodiment, the method of measuring the electric conductivity of the water in the outer tank by using the electric conductivity sensor 28 as a means for detecting the water level has been described. However, for example, the water level can be measured by combining a float and a mechanical switch. A means for detecting may be used.

１ 筐体
３ ドア
１０ 給水ユニット
１４ ドラム
１５ 外槽
１６ 外槽カバー
１８ モータ
２５ 水位センサー
２７ 制御装置
２８ 電導度センサー
２９ ヒータ
３０ ヒータカバー 1 Housing 3 Door 10 Water supply unit 14 Drum 15 Outer tank 16 Outer tank cover 18 Motor 25 Water level sensor 27 Control device 28 Conductivity sensor 29 Heater 30 Heater cover

Claims (3)

水を溜める外槽と、
前記外槽内に回転自在に支持され、衣類が収容される内槽と、
前記外槽内に給水する給水部と、
前記外槽内に給水された水を加熱する水加熱部と、
前記外槽内の水位を検知する水位検知部と、
前記外槽内の所定区間の電導度を測定する電導度測定部と、
前記水位検知部及び前記電導度測定部を制御する制御部と、を有し、
前記制御部は、前記水位検知部の検知結果によって前記水位が所定水位以上であることを判定し、かつ、前記電導度測定部の検出結果が所定の閾値以上であると判定した場合に前記水加熱部の加熱開始を制御する、ことを特徴とする洗濯機。 An outer tank for storing water and
The inner tank, which is rotatably supported in the outer tank and accommodates clothing,
The water supply unit that supplies water to the outer tank and
A water heating unit that heats the water supplied to the outer tank,
A water level detection unit that detects the water level in the outer tank,
An electric conductivity measuring unit that measures the electric conductivity of a predetermined section in the outer tank,
It has a water level detection unit and a control unit that controls the conductivity measurement unit.
Wherein, the water if the water level by the detection result of the water level detection unit determines that is not less than a predetermined level, and the detection result of the conductivity measurement unit is equal to or more than the predetermined threshold value A washing machine characterized in that it controls the start of heating of a heating unit. 請求項１記載の洗濯機であって、
前記電導度測定部は前記水加熱部より高い位置に設けられている、洗濯機。 The washing machine according to claim 1.
A washing machine in which the conductivity measuring unit is provided at a position higher than the water heating unit. 請求項２記載の洗濯機であって、
前記制御部は、前記水位検知部によって前記内槽内に前記水加熱部が完全に水没する水量まで給水されたことを検知したことに加え、前記電導度測定部によって所定の高さまで水位が上がったことを検知した上で前記水加熱部により前記内槽内の水の加熱を開始する、洗濯機。 The washing machine according to claim 2.
In addition to detecting that the water level detecting unit has supplied water to the inner tank to the extent that the water heating unit is completely submerged, the control unit raises the water level to a predetermined height by the conductivity measuring unit. A washing machine that starts heating the water in the inner tank by the water heating unit after detecting that.
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