JP5019894B2 - Dishwasher - Google Patents

Dishwasher Download PDF

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JP5019894B2
JP5019894B2 JP2007021302A JP2007021302A JP5019894B2 JP 5019894 B2 JP5019894 B2 JP 5019894B2 JP 2007021302 A JP2007021302 A JP 2007021302A JP 2007021302 A JP2007021302 A JP 2007021302A JP 5019894 B2 JP5019894 B2 JP 5019894B2
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heating element
water level
cleaning
lower limit
detection unit
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JP2008183327A5 (en
JP2008183327A (en
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勝 森村
隆志 佐藤
拓 伊藤
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Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
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Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
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本発明は、洗浄槽内の洗浄水が異常に低いときに発熱体への通電を遮断する食器洗浄機に関するものである。   The present invention relates to a dishwasher that cuts off power to a heating element when cleaning water in a cleaning tank is abnormally low.

従来の食器洗浄機は、洗浄槽内の食器類を洗浄する際、まず洗浄槽内に水を供給し、水位検出手段によって所定水位が検出されたときは給水を停止する。そして、発熱体によって洗浄槽内の洗浄水を加熱し、温度検出手段を通して洗浄水が所定温度になったことを検知したときに食器洗浄に入る。前述した水位検出手段として、洗浄槽に連結されたフロート室と、フロート室内のフロートの上昇位置に応じて洗浄槽内の水位を検出する２つの磁気検出装置と、洗浄槽内の上限水位を検出する一対の電極とからなるものがある（例えば、特許文献１参照）。
特開２００２−５３６号公報（第３頁、図１） When washing the dishes in the washing tub, the conventional dishwasher first supplies water into the washing tub and stops water supply when a predetermined water level is detected by the water level detecting means. Then, the washing water in the washing tank is heated by the heating element, and when it is detected that the washing water has reached a predetermined temperature through the temperature detecting means, the dish washing starts. As the water level detection means described above, a float chamber connected to the cleaning tank, two magnetic detection devices for detecting the water level in the cleaning tank according to the rising position of the float in the float chamber, and an upper limit water level in the cleaning tank are detected. There exist some which consist of a pair of electrode which do (for example, refer patent document 1).
JP 2002-536 A (Page 3, FIG. 1)

前述した水位検出手段は、食器洗浄に必要な水量を検出しているだけであり、そのため、温度検出手段が何らかの要因で故障したり、マイコンが暴走したりした場合には、発熱体への通電が制御されることなく連続的に行われる。このような状態になった場合、洗浄水が沸騰・蒸発などして水位が低下し、発熱体が水面から露出して空焼きとなり、洗浄槽が変形するなどの危険な状態となる可能性があった。   The above-described water level detection means only detects the amount of water necessary for washing dishes, so if the temperature detection means fails for some reason or the microcomputer runs out of control, the heating element is energized. Is performed continuously without being controlled. If this happens, the cleaning water may boil and evaporate, the water level will drop, the heating element will be exposed from the water surface and become baked, and the cleaning tank may be deformed. there were.

本発明は、前述のような課題を解決するためになされたもので、温度検出装置やマイコンなどが故障して発熱体への通電制御が不能になったとしても、発熱体による洗浄槽内の異常過熱を防止することのできる食器洗浄機を提供することを目的とする。   The present invention has been made to solve the above-described problems, and even if the temperature detection device, the microcomputer, etc. breaks down and the energization control to the heating element becomes impossible, the heating tank has a cleaning tank. An object is to provide a dishwasher capable of preventing abnormal overheating.

本発明に係る食器洗浄機は、洗浄槽内の洗浄水を加熱する発熱体と、洗浄槽内の洗浄水の水位が発熱体の位置とほぼ同じ高さになる水位を下限水位として検出する下限水位検出部と、下限水位検出部より高い位置に設置され、洗浄に必要な洗浄水の水位を検出する洗浄水位検出部と、発熱体に通電するための発熱体通電回路と、発熱体に通電させるための電源を供給する電源制御回路と、洗浄水位検出部により洗浄水位が検出されたときに発熱体通電回路を制御して発熱体に通電させる制御手段とを備え、電源制御回路は、下限水位検出部により検出された洗浄槽内の洗浄水の水位が下限水位以上のときに発熱体通電回路を電源と接続し、制御手段により発熱体への通電の制御が発熱体通電回路を通して行われているときに下限水位検出部により下限水位より低い洗浄水の水位が検出されると、発熱体通電回路を電源から切り離して発熱体への通電を停止させる。
The dishwasher according to the present invention includes a heating element for heating the washing water in the washing tank, and a lower limit for detecting a water level at which the washing water level in the washing tank is substantially the same as the position of the heating element as a lower limit water level. Installed at a position higher than the water level detection unit, the lower limit water level detection unit, the cleaning water level detection unit for detecting the level of the cleaning water necessary for cleaning , the heating element energization circuit for energizing the heating element, and the heating element A power supply control circuit for supplying power to the power supply, and a control means for controlling the heating element energization circuit to energize the heating element when the cleaning water level is detected by the cleaning water level detection unit. When the cleaning water level in the cleaning tank detected by the water level detector is above the lower limit level, the heating element energization circuit is connected to the power supply, and the control means controls the energization of the heating element through the heating element energization circuit. The lower limit water level detector Ri when the water level is lower than the lower limit level washing water is detected, stops the power supply to the heating element to disconnect the heating element energizing circuit from the power source.

本発明によれば、電源制御回路は、下限水位検出部により検出された洗浄槽内の洗浄水の水位が下限水位以上のときに発熱体通電回路を電源と接続し、制御手段により発熱体への通電の制御が発熱体通電回路を通して行われているときに下限水位検出部により下限水位より低い洗浄水の水位が検出されると、発熱体通電回路を電源から切り離して発熱体への通電を停止させるようにしている。これにより、制御手段の異常により発熱体への通電制御が正常に行えなくなったとしても、発熱体による洗浄槽内の異常過熱を防止することができ、安全性が向上するという効果がある。 According to the present invention, the power supply control circuit connects the heating element energization circuit to the power supply when the cleaning water level in the cleaning tank detected by the lower limit water level detection unit is equal to or higher than the lower limit water level, and the control means supplies the heating element to the heating element. If the cleaning water level lower than the lower limit water level is detected by the lower limit water level detection unit while the energization control is performed through the heating element energization circuit, the heating element energization circuit is disconnected from the power source and the heating element is energized. I try to stop it. As a result, even if energization control to the heating element cannot be performed normally due to an abnormality of the control means, abnormal overheating in the cleaning tank by the heating element can be prevented, and the safety is improved.

実施の形態１．
図１は本発明の実施の形態１に係る食器洗浄機を示す内部の説明図、図２は水位検出手段の説明図、図３は実施の形態１に係る食器洗浄機の構成を示すブロック図である。
図１に示す洗浄槽１は、食器かご８が着脱可能に収納され、食器かご８の下方に洗浄ノズル５とヒータの発熱体９が配設され、給水弁２を通して流入する蛇口（図示せず）からの水を洗浄水３として貯留する。洗浄槽１の下方に設置された洗浄ポンプ４は、前記の洗浄ノズル５が回転自在に取り付けられ、洗浄及びすすぎの各工程で駆動される。駆動した際には、洗浄槽１内の洗浄水３をフィルタ１１を介して吸引し、洗浄ノズル５に圧送して複数の噴射口６から噴射させる。洗浄ノズル５は、噴射口６から噴射される洗浄水３の反動で一方向に回転し、食器かご８に並べられた食器７を洗浄する。 Embodiment 1 FIG.
FIG. 1 is an explanatory diagram showing an interior of a dishwasher according to Embodiment 1 of the present invention, FIG. 2 is an explanatory diagram of a water level detecting means, and FIG. 3 is a block diagram showing a configuration of the dishwasher according to Embodiment 1. It is.
In the washing tank 1 shown in FIG. 1, a table basket 8 is detachably housed, a washing nozzle 5 and a heater heating element 9 are disposed below the table basket 8, and a faucet (not shown) flows through the water supply valve 2. ) Is stored as wash water 3. The cleaning pump 4 installed below the cleaning tank 1 is rotatably mounted with the cleaning nozzle 5 and is driven in each process of cleaning and rinsing. When driven, the cleaning water 3 in the cleaning tank 1 is sucked through the filter 11 and is pumped to the cleaning nozzle 5 and sprayed from a plurality of injection ports 6. The washing nozzle 5 rotates in one direction in response to the reaction of the washing water 3 ejected from the ejection port 6 to wash the tableware 7 arranged in the tableware basket 8.

排水ポンプ１０は、洗浄及びすすぎの各工程が終了する毎に駆動され、駆動した際には、洗浄槽１内の洗浄水３をフィルタ１１を介して吸引し、外部に排出する。送風ファン１２は、すすぎ工程終了時に駆動され、洗浄槽１内に温風を送り込んで食器７を乾燥させる。この温風は、洗浄槽１の背面側の側板１ａと隔壁１ｂとで形成される風路を通って循環し、その風路に配設されたヒータ１３によって暖められている。温度検出装置１４は、発熱体９によって加熱された洗浄水３の温度を検出し、その情報を制御装置３０に出力する。   The drain pump 10 is driven every time the cleaning and rinsing steps are completed. When the drain pump 10 is driven, the cleaning water 3 in the cleaning tank 1 is sucked through the filter 11 and discharged to the outside. The blower fan 12 is driven at the end of the rinsing process, and sends hot air into the cleaning tank 1 to dry the tableware 7. This warm air circulates through an air passage formed by the side plate 1a and the partition wall 1b on the back side of the cleaning tank 1, and is warmed by a heater 13 disposed in the air passage. The temperature detection device 14 detects the temperature of the cleaning water 3 heated by the heating element 9 and outputs the information to the control device 30.

水位検出手段２０は、洗浄槽１内の洗浄水３が流入するフロート室２１と、フロート室２１内に流入した洗浄水３の水位に応じて軸方向に上下動し、側面に磁石２２ａを有するフロート２２と、洗浄槽１内の洗浄水３の下限水位を検出するための下限水位検出部２３及び洗浄に必要な水位を検出するための洗浄水位検出部２４（図２参照）とを備えている。下限水位検出部２３と洗浄水位検出部２４は、例えば、フロート２２の磁石２２ａと対向したときに接点がオンするリードスイッチを有し、フロート室２１の側板表面にそれぞれ設置されている。下限水位検出部２３は、当初、フロート２２の磁石２２ａと対向してオン状態となっており、洗浄水３の水位上昇に伴ってフロート２２が上方に移動したときにオフする。洗浄水位検出部２４は、下限水位検出部２３とは逆にオフ状態となっており、洗浄水３の水位上昇に伴ってフロート２２の磁石２２ａと対向したときにオンする。下限水位検出部２３によって検出される下限水位は、発熱体９の取付位置、具体的には発熱体９が水面から露出する寸前の高さである。なお、これに代えて、その位置よりも高い位置を下限水位としてもよい。洗浄水位検出部２４により検出される洗浄水位は、洗浄に必要な水位である。   The water level detecting means 20 has a float chamber 21 into which the cleaning water 3 in the cleaning tank 1 flows, and moves up and down in the axial direction according to the water level of the cleaning water 3 flowing into the float chamber 21, and has a magnet 22a on the side surface. A float 22, a lower limit water level detection unit 23 for detecting the lower limit water level of the cleaning water 3 in the cleaning tank 1, and a cleaning water level detection unit 24 (see FIG. 2) for detecting a water level necessary for cleaning are provided. Yes. The lower limit water level detection unit 23 and the cleaning water level detection unit 24 have, for example, a reed switch whose contact is turned on when facing the magnet 22 a of the float 22, and are respectively installed on the side plate surface of the float chamber 21. The lower limit water level detection unit 23 is initially turned on in opposition to the magnet 22 a of the float 22, and is turned off when the float 22 moves upward as the cleaning water 3 rises. The washing water level detection unit 24 is in an off state, contrary to the lower limit water level detection unit 23, and is turned on when the washing water 3 faces the magnet 22a of the float 22 as the washing water 3 rises. The lower limit water level detected by the lower limit water level detection unit 23 is the mounting position of the heating element 9, specifically the height immediately before the heating element 9 is exposed from the water surface. Instead of this, a position higher than that position may be set as the lower limit water level. The cleaning water level detected by the cleaning water level detection unit 24 is a water level necessary for cleaning.

前述した制御装置３０は、図３に示すように、マイクロコンピュータ３１（以下、単に「マイコン３１」という）、給水弁駆動回路３２、洗浄ポンプ駆動回路３３、排水ポンプ駆動回路３４、送風ファン駆動回路３５、操作パネル（図示せず）からの操作に応じてマイコン３１に信号を出力するスイッチ入力部３６、マイコン３１からの信号に基づいて表示部３８に表示する表示部駆動回路３７、発熱体通電回路３９などを備えている。前記のマイコン３１は、洗浄水位検出部２４がオンしたとき洗浄に必要な水位になったと判断して発熱体通電回路３９から発熱体９に通電させ、下限水位検出部２３がオフ状態からオンしたときは発熱体９への通電を停止させる制御手段を備えている。   As shown in FIG. 3, the control device 30 includes a microcomputer 31 (hereinafter simply referred to as “microcomputer 31”), a water supply valve drive circuit 32, a cleaning pump drive circuit 33, a drainage pump drive circuit 34, and a blower fan drive circuit. 35, a switch input unit 36 for outputting a signal to the microcomputer 31 in response to an operation from an operation panel (not shown), a display unit driving circuit 37 for displaying on the display unit 38 based on the signal from the microcomputer 31, and heating element energization A circuit 39 and the like are provided. The microcomputer 31 determines that the water level required for cleaning is reached when the cleaning water level detection unit 24 is turned on, and causes the heating element energization circuit 39 to energize the heating element 9, and the lower limit water level detection unit 23 is turned on from the off state. In some cases, control means for stopping energization of the heating element 9 is provided.

次に、前記のように構成された食器洗浄機の動作を説明する。
マイコン３１は、スイッチ入力部３６を通して食器洗浄の指示を検知すると、まず、給水弁駆動回路３２を介して給水弁２を開き、洗浄槽１内に水を流入させる。そして、下限水位検出部２３がオン状態からオフになったか否かを判定し、下限水位検出部２３がオン状態のときは、洗浄水３の水位が下限水位より低いと判断して、下限水位検出部２３がオフになるまで待機する。その後、下限水位検出部２３がオン状態からオフになると、洗浄水位検出部２４がオフ状態からオンになったか否かを判定する。洗浄水位検出部２４がオフ状態のときは、洗浄水３が洗浄に必要な水位まで達していないと判断して、洗浄水位検出部２４がオンになるまで待機する。フロート２２の上方への移動により、洗浄水位検出部２４がオフ状態からオンになると、洗浄水３が洗浄に必要な水位に達したと判断して給水弁２を閉じ、発熱体通電回路３９をオンして発熱体９に通電させる。 Next, the operation of the dishwasher configured as described above will be described.
When the microcomputer 31 detects a dish washing instruction through the switch input unit 36, the microcomputer 31 first opens the water supply valve 2 via the water supply valve drive circuit 32 and causes water to flow into the cleaning tank 1. Then, it is determined whether or not the lower limit water level detection unit 23 has been turned off from the on state. When the lower limit water level detection unit 23 is in the on state, it is determined that the water level of the wash water 3 is lower than the lower limit water level. It waits until the detection part 23 turns off. Thereafter, when the lower limit water level detection unit 23 is turned off from the on state, it is determined whether or not the cleaning water level detection unit 24 is turned on from the off state. When the cleaning water level detection unit 24 is in the off state, it is determined that the cleaning water 3 has not reached the water level necessary for cleaning, and the system waits until the cleaning water level detection unit 24 is turned on. When the cleaning water level detector 24 is turned on from the off state due to the upward movement of the float 22, it is determined that the cleaning water 3 has reached the water level necessary for cleaning, the water supply valve 2 is closed, and the heating element energization circuit 39 is turned on. Turns on and energizes the heating element 9.

この時、マイコン３１は、温度検出装置１４を通して洗浄水３の温度が所定温度（例えば８０℃）に達したか否かを判定し、洗浄水３の温度が所定温度に達していないと判断したときは、発熱体９への通電を継続させる。そして、温度検出装置１４の検出温度が所定温度に達したときは、発熱体通電回路３９をオフ状態にして発熱体９への通電を停止させ、洗浄ポンプ駆動回路３３を通して洗浄ポンプ４を駆動し、高温の洗浄水３を洗浄ノズル５から噴射させる。この時、洗浄水３の温度が所定温度に保たれるように発熱体９の通電量を発熱体通電回路３９を通して制御する。   At this time, the microcomputer 31 determines whether or not the temperature of the cleaning water 3 has reached a predetermined temperature (for example, 80 ° C.) through the temperature detection device 14 and determines that the temperature of the cleaning water 3 has not reached the predetermined temperature. When it is, energization of the heating element 9 is continued. When the temperature detected by the temperature detector 14 reaches a predetermined temperature, the heating element energization circuit 39 is turned off to stop energization of the heating element 9 and the cleaning pump 4 is driven through the cleaning pump drive circuit 33. Then, hot cleaning water 3 is sprayed from the cleaning nozzle 5. At this time, the energization amount of the heating element 9 is controlled through the heating element energization circuit 39 so that the temperature of the cleaning water 3 is maintained at a predetermined temperature.

マイコン３１は、発熱体９への通電を継続させているときに下限水位検出部２３がオフ状態からオンすると、温度検出装置１４が故障していると判断して、発熱体通電回路３９をオフ状態にし、発熱体９への通電を停止させて食器洗浄の運転を中止し、温度検出装置１４の故障によって中止した旨を表示部駆動回路３７を介して表示部３８に表示する。   If the lower limit water level detection unit 23 is turned on from the off state while the energization of the heating element 9 is continued, the microcomputer 31 determines that the temperature detection device 14 has failed and turns off the heating element energization circuit 39. Then, the energization of the heating element 9 is stopped to stop the dish washing operation, and the display unit 38 is displayed via the display unit driving circuit 37 that the temperature detecting device 14 has been stopped due to a failure.

以上のように実施の形態１によれば、洗浄槽１内の洗浄水３が洗浄水位に達すると発熱体通電回路３９をオンして発熱体９に通電させ、発熱体９への通電中に下限水位検出部２３により下限水位が検出されたときは、温度検出装置１４が故障していると判断して発熱体９への通電を停止させるようにしたので、発熱体９による洗浄槽１内の異常過熱を防止することが可能になり、安全性が向上するという効果がある。   As described above, according to the first embodiment, when the cleaning water 3 in the cleaning tank 1 reaches the cleaning water level, the heating element energization circuit 39 is turned on and the heating element 9 is energized. When the lower limit water level is detected by the lower limit water level detection unit 23, it is determined that the temperature detection device 14 is out of order and the energization of the heating element 9 is stopped. It is possible to prevent abnormal overheating, and the safety is improved.

実施の形態２．
図４は本発明の実施の形態２に係る食器洗浄機の構成を示すブロック図である。なお、図１〜図３で説明した実施の形態１と同一又は相当部分には同じ符号を付し説明を省略する。
実施の形態２の食器洗浄機は、発熱体通電回路３９と電源供給回路４１との間に電源制御回路４０を挿入し、この電源制御回路４０に下限水位検出部２３を接続したものである。前述の電源制御回路４０は、下限水位検出部２３がオン状態のとき、発熱体通電回路３９を電源供給回路４１から切り離し、下限水位検出部２３がオフ状態のときは、発熱体通電回路３９を電源供給回路４１と接続する。マイコン３１は、洗浄槽１内に水を供給しているとき、洗浄水位検出部２４がオフ状態からオンになったか否かを判定し、オンしたことを検知したときは、洗浄水３が洗浄に必要な水位に達したと判断して発熱体通電回路３９をオンし発熱体９に通電させる。
Embodiment 2. FIG.
FIG. 4 is a block diagram showing the configuration of the dishwasher according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1 demonstrated in FIGS. 1-3, and description is abbreviate | omitted.
In the dishwasher according to the second embodiment, a power control circuit 40 is inserted between a heating element energization circuit 39 and a power supply circuit 41, and a lower limit water level detection unit 23 is connected to the power control circuit 40. The aforementioned power supply control circuit 40, when the lower limit water level detector 23 is on state, to disconnect the heating element energizing circuit 39 from the power supply circuit 41, when the lower limit water level detector 23 is OFF state, the heating element energizing circuit 39 is connected to the power supply circuit 41. The microcomputer 31 determines whether or not the cleaning water level detection unit 24 is turned on from the off state when supplying water into the cleaning tank 1. When the microcomputer 31 detects that the water is turned on, the washing water 3 is washed. The heating element energization circuit 39 is turned on and the heating element 9 is energized.

次に、本実施の形態の食器洗浄機の動作を説明する。
マイコン３１は、前述したように、まず、給水弁駆動回路３２を介して給水弁２を開き、洗浄槽１内に水を流入させ、洗浄水位検出部２４がオフ状態からオンになったか否かの判定に入る。一方、電源制御回路４０は、下限水位検出部２３がオン状態からオフになったか否かを判定し、下限水位検出部２３がオン状態のときは、洗浄水３の水位が下限水位より低いと判断して、下限水位検出部２３がオフになるまで待機する。そして、下限水位検出部２３がオン状態からオフになると、発熱体通電回路３９を電源供給回路４１と接続する。 Next, operation | movement of the dishwasher of this Embodiment is demonstrated.
As described above, the microcomputer 31 first opens the water supply valve 2 via the water supply valve drive circuit 32 to flow water into the cleaning tank 1, and whether or not the cleaning water level detection unit 24 is turned on from the off state. Enter the decision. On the other hand, the power supply control circuit 40 determines whether or not the lower limit water level detection unit 23 is turned off from the on state. When the lower limit water level detection unit 23 is on, the water level of the wash water 3 is lower than the lower limit water level. It judges and waits until the lower limit water level detection part 23 turns off. When the lower limit water level detection unit 23 is turned off from the on state, the heating element energization circuit 39 is connected to the power supply circuit 41.

この時、マイコン３１は、前述したように洗浄水位検出部２４がオフ状態からオンになったか否かを繰り返し判定しており、洗浄水位検出部２４のオンを検知したときは、洗浄水３が洗浄に必要な水位に達したと判断して給水弁２を閉じ、発熱体通電回路３９をオンして発熱体９に通電させる。その後、温度検出装置１４を通して洗浄水３の温度が所定温度（例えば８０℃）に達したか否かを判定し、洗浄水３の温度が所定温度に達していないと判断したときは、発熱体９への通電を継続させる。そして、温度検出装置１４の検出温度が所定温度に達したときは、発熱体通電回路３９をオフ状態にして発熱体９への通電を停止させ、洗浄ポンプ駆動回路３３を通して洗浄ポンプ４を駆動し、高温の洗浄水３を洗浄ノズル５から噴射させる。この時、洗浄水３の温度が所定温度に保たれるように発熱体９の通電量を発熱体通電回路３９を通して制御する。   At this time, as described above, the microcomputer 31 repeatedly determines whether or not the cleaning water level detection unit 24 has been turned on from the off state, and when the cleaning water level detection unit 24 is detected to be on, It is determined that the water level necessary for cleaning has been reached, the water supply valve 2 is closed, the heating element energization circuit 39 is turned on, and the heating element 9 is energized. Thereafter, it is determined whether or not the temperature of the cleaning water 3 has reached a predetermined temperature (for example, 80 ° C.) through the temperature detection device 14, and when it is determined that the temperature of the cleaning water 3 has not reached the predetermined temperature, the heating element Continue energizing 9. When the temperature detected by the temperature detector 14 reaches a predetermined temperature, the heating element energization circuit 39 is turned off to stop energization of the heating element 9 and the cleaning pump 4 is driven through the cleaning pump drive circuit 33. Then, hot cleaning water 3 is sprayed from the cleaning nozzle 5. At this time, the energization amount of the heating element 9 is controlled through the heating element energization circuit 39 so that the temperature of the cleaning water 3 is maintained at a predetermined temperature.

一方、電源制御回路４０は、発熱体通電回路３９が発熱体９への通電を継続しているときに、下限水位検出部２３のオンを検知すると、温度検出装置１４の故障あるいはマイコン３１の暴走による異常と判断して、発熱体通電回路３９を電源供給回路４１から切り離し、発熱体９への通電を停止させて食器洗浄の運転を中止する。   On the other hand, when the power supply control circuit 40 detects that the lower limit water level detection unit 23 is turned on while the heating element energization circuit 39 continues energizing the heating element 9, the temperature detection device 14 fails or the microcomputer 31 runs away. Therefore, the heating element energization circuit 39 is disconnected from the power supply circuit 41, the energization of the heating element 9 is stopped, and the dishwashing operation is stopped.

以上のように実施の形態２によれば、マイコン３１の指示によって発熱体通電回路３９が発熱体９への通電を継続しているときに、電源制御回路４０が下限水位検出部２３のオンを検知すると、温度検出装置１４の故障あるいはマイコン３１の暴走による異常と判断して、発熱体通電回路３９を電源供給回路４１から切り離すようにしたので、発熱体９による洗浄槽１内の異常過熱を防止することが可能になり、より安全性が向上するという効果がある。   As described above, according to the second embodiment, the power supply control circuit 40 turns on the lower limit water level detection unit 23 when the heating element energizing circuit 39 continues energizing the heating element 9 according to the instruction from the microcomputer 31. When detected, it is determined that the temperature detecting device 14 is malfunctioning or the microcomputer 31 is out of control, and the heating element energizing circuit 39 is disconnected from the power supply circuit 41. It is possible to prevent this, and there is an effect that safety is further improved.

本発明の実施の形態１に係る食器洗浄機を示す内部の説明図である。It is internal explanatory drawing which shows the dishwasher which concerns on Embodiment 1 of this invention. 水位検出手段の説明図である。It is explanatory drawing of a water level detection means. 実施の形態１に係る食器洗浄機の構成を示すブロック図である。It is a block diagram which shows the structure of the dishwasher which concerns on Embodiment 1. FIG. 実施の形態２に係る食器洗浄機の構成を示すブロック図である。It is a block diagram which shows the structure of the dishwasher which concerns on Embodiment 2. FIG.

符号の説明Explanation of symbols

１ 洗浄槽、２ 給水弁、４ 洗浄ポンプ、５ 洗浄ノズル、６ 噴射口、８ 食器かご、９ 発熱体、１０ 排水ポンプ、１１ フィルタ、１２ 送風ファン、１３ ヒータ、１４ 温度検出装置、２０ 水位検出手段、２１ フロート室、２２ フロート、
２２ａ 磁石、２３ 下限水位検出部、２４ 洗浄水位検出部。 DESCRIPTION OF SYMBOLS 1 Washing tank, 2 Water supply valve, 4 Washing pump, 5 Washing nozzle, 6 Injection port, 8 Tableware basket, 9 Heating element, 10 Drain pump, 11 Filter, 12 Blower fan, 13 Heater, 14 Temperature detection device, 20 Water level detection Means, 21 float chamber, 22 float,
22a Magnet, 23 Lower limit water level detection unit, 24 Washing water level detection unit.

Claims (2)

洗浄槽内の洗浄水を加熱する発熱体と、
洗浄槽内の洗浄水の水位が前記発熱体の位置とほぼ同じ高さになる水位を下限水位として検出する下限水位検出部と、
前記下限水位検出部より高い位置に設置され、洗浄に必要な洗浄水の水位を検出する洗浄水位検出部と、
前記発熱体に通電するための発熱体通電回路と、
前記発熱体に通電させるための電源を供給する電源制御回路と、
前記洗浄水位検出部により洗浄水位が検出されたときに前記発熱体通電回路を制御して前記発熱体に通電させる制御手段とを備え、
前記電源制御回路は、前記下限水位検出部により検出された洗浄槽内の洗浄水の水位が下限水位以上のときに前記発熱体通電回路を電源と接続し、前記制御手段により前記発熱体への通電の制御が前記発熱体通電回路を通して行われているときに前記下限水位検出部により下限水位より低い洗浄水の水位が検出されると、前記発熱体通電回路を電源から切り離して前記発熱体への通電を停止させることを特徴とする食器洗浄機。 A heating element for heating the cleaning water in the cleaning tank;
A lower limit water level detection unit for detecting a water level at which the level of the cleaning water in the cleaning tank is substantially the same height as the position of the heating element, as a lower limit water level;
A cleaning water level detection unit that is installed at a position higher than the lower limit water level detection unit and detects the level of cleaning water necessary for cleaning , and
A heating element energization circuit for energizing the heating element;
A power supply control circuit for supplying power for energizing the heating element;
Control means for controlling the heating element energization circuit to energize the heating element when the cleaning water level is detected by the cleaning water level detection unit,
The power supply control circuit connects the heating element energization circuit to a power supply when the level of the cleaning water in the cleaning tank detected by the lower limit water level detection unit is equal to or higher than the lower limit water level, and the control means supplies the heating element to the heating element. When the control of energization is performed through the heating element energization circuit, and the cleaning water level lower than the lower limit water level is detected by the lower limit water level detection unit, the heating element energization circuit is disconnected from the power source to the heating element. A dishwasher characterized by stopping the energization of the kitchen. 前記下限水位検出部は、洗浄槽内の洗浄水の水位が前記発熱体の位置とほぼ同じ高さになる水位を下限水位とするのに代えて、前記発熱体が水面から露出する寸前の高さの水位を下限水位として検出することを特徴とする請求項１記載の食器洗浄機。 The lower limit level detecting unit, instead of the water level the water level of the washing water in the washing tank is approximately level with the position of the heating element to the lower limit level, a high of about to the heating element is exposed from the water surface The dishwasher according to claim 1, wherein the water level is detected as a lower limit water level .
JP2007021302A 2007-01-31 2007-01-31 Dishwasher Active JP5019894B2 (en)

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