JPH0928569A - Electric eater boiler - Google Patents
Electric eater boilerInfo
- Publication number
- JPH0928569A JPH0928569A JP18521795A JP18521795A JPH0928569A JP H0928569 A JPH0928569 A JP H0928569A JP 18521795 A JP18521795 A JP 18521795A JP 18521795 A JP18521795 A JP 18521795A JP H0928569 A JPH0928569 A JP H0928569A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- heating
- container
- comparison value
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Cookers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、容器内に収容された液
体を加熱・保温する電気湯沸かし器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater for heating and retaining the temperature of a liquid contained in a container.
【０００２】[0002]
【従来の技術】以下に、従来のこの種の電気湯沸かし器
について説明する。2. Description of the Related Art A conventional electric water heater of this type will be described below.
【０００３】図８に示すように、容器21の底部には加熱
手段22と保温手段23をドーナツ状に当接し、その中心に
容器21内の温度を検知する温度センサ24を当接した温度
検知手段を備えていた。そのため、温度センサ24への熱
伝導はやや遅れる構成になっている。しかも、温度セン
サ24は加熱手段22，保温手段23の雰囲気による影響を少
なくし、かつ容器21内の温度を確実に検知できるように
するため、容器21内に少し突き出した構成となってい
た。As shown in FIG. 8, a heating means 22 and a heat retaining means 23 are brought into contact with the bottom of the container 21 in a donut shape, and a temperature sensor 24 for detecting the temperature inside the container 21 is brought into contact with the center of the heating means 22 and the heat retention means 23. It was equipped with means. Therefore, the heat conduction to the temperature sensor 24 is slightly delayed. In addition, the temperature sensor 24 is slightly protruded into the container 21 in order to reduce the influence of the atmosphere of the heating means 22 and the heat retaining means 23 and to reliably detect the temperature inside the container 21.
【０００４】そして、加熱が開始されると加熱手段22に
通電し、容器21内の温度上昇を測定し、単位温度上昇す
るのに要する時間が所定値より小さければ、容器21内に
水を入れていない状態で加熱を開始した空焼き状態であ
ると判断し、加熱手段22を停止させていた。つまり、容
器21内に水を入れていない状態で加熱手段22による加熱
を行うと、容器21は加熱手段22により急激に温度上昇
し、単位温度上昇するのに要する時間が短くなることを
利用している。When the heating is started, the heating means 22 is energized, the temperature rise in the container 21 is measured, and if the time required to raise the unit temperature is smaller than a predetermined value, water is put in the container 21. It was judged that the heating was started in the state where the heating was not started, and the heating means 22 was stopped. That is, if heating is performed by the heating means 22 in a state where water is not placed in the container 21, the temperature of the container 21 is rapidly increased by the heating means 22, and it takes advantage of the fact that the time required for increasing the unit temperature is shortened. ing.
【０００５】また、空焼き状態を検知する方法として、
特開昭63-294815号公報に示す方法がある。つまり、加
熱開始から５分以内に加熱手段22をオフさせて、その間
の温度上昇度合によって空焼きを検知していた。なお、
加熱開始から加熱手段22をオフさせるのは、空焼き状態
で加熱手段22に５分以上通電すると容器が過加熱して変
色を生じるためである。Further, as a method for detecting the state of air baking,
There is a method disclosed in JP-A-63-294815. That is, the heating means 22 is turned off within 5 minutes from the start of heating, and the baking is detected by the degree of temperature increase during that period. In addition,
The reason why the heating means 22 is turned off from the start of heating is that the container is overheated and discolored when the heating means 22 is energized for 5 minutes or more in an idle state.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、近年、
湯沸かし時間の短縮を図るために加熱手段の電力が大き
くなってきており、輻射熱による温度センサー24の雰囲
気温度が上昇し、影響も大きくなってきている。However, in recent years,
The electric power of the heating means is increasing in order to shorten the boiling time, and the ambient temperature of the temperature sensor 24 is increased by the radiant heat, and the influence is also increasing.
【０００７】図９は輻射熱による温度センサー24の温度
上昇を示す。図に示すように、温度が低い部分では、雰
囲気温度が急激に上昇するので、温度センサー24は雰囲
気温度の影響を大きく受けて検出温度も急激に上昇す
る。一方、温度が高い部分では、雰囲気温度の温度上昇
も緩やかになり、温度センサー24は雰囲気温度の影響を
受けにくくなり、温度センサー24の検出温度は容器21内
の液体の温度(水温）に近づいていくとともに、検出温
度の温度上昇も緩やかになる。FIG. 9 shows the temperature rise of the temperature sensor 24 due to radiant heat. As shown in the figure, in a portion where the temperature is low, the ambient temperature sharply rises, so the temperature sensor 24 is greatly affected by the ambient temperature, and the detected temperature also sharply rises. On the other hand, in a portion where the temperature is high, the temperature rise of the ambient temperature also becomes gradual, the temperature sensor 24 becomes less susceptible to the ambient temperature, and the temperature detected by the temperature sensor 24 approaches the temperature of the liquid (water temperature) in the container 21. As the temperature rises, the detected temperature rises gradually.
【０００８】このような温度上昇特性を持つ温度センサ
ー24に対して、例えば湯沸かし開始時の温度に関係な
く、一定の温度上昇だけで空焼きを検知しようとする
と、高温で加熱開始したときと低温で加熱開始したとき
では温度上昇が異なるため、高温の時ほど空焼き検知に
時間がかかり、加熱手段を停止した時には、それまでに
供給された電力が大きいため温度がさらに上昇し（通常
400℃以上）、温度センサーを構成する感温素子および
容器が変形したり、容器内が変色するという問題があっ
た。With respect to the temperature sensor 24 having such a temperature rise characteristic, for example, if it is attempted to detect an idle firing only by a constant temperature rise regardless of the temperature at the start of boiling water, when the heating at a high temperature starts Since the temperature rises differently when the heating is started in, the detection of the baking will take longer when the temperature is higher, and when the heating means is stopped, the temperature will rise further because the power supplied up to that point is large (usually
400 ° C or higher), there is a problem that the temperature-sensitive element and the container constituting the temperature sensor are deformed or the inside of the container is discolored.
【０００９】本発明は、上記従来の問題点を解決するも
ので、加熱開始時の温度によって空焼き検知するための
温度上昇の比較値を変えてやることで、空焼きを的確に
検知して、過熱による温度検知手段の異常および容器の
変形や変色するのを防ぎ、品質性能が劣化しない電器湯
沸かし器を提供することを目的とする。The present invention solves the above-mentioned conventional problems. By changing the comparative value of the temperature rise for detecting the firing in accordance with the temperature at the start of heating, the firing is accurately detected. An object of the present invention is to provide an electric water heater that prevents abnormal temperature detection means due to overheating and deformation or discoloration of a container and does not deteriorate quality performance.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に本発明の第１の課題解決手段は、液体を収容する容器
と、前記容器内の液体温度を検知する温度検知手段と、
前記容器内の液体を加熱する加熱手段と、前記加熱手段
へ通電する通電手段と、前記温度検知手段の入力により
温度勾配を測定する測定手段と、この温度勾配を比較値
と比較し、前記通電手段の動作を制御する比較手段と、
湯沸かしあるいは保温時に前記通電手段を駆動する駆動
手段と、前記比較手段の比較値を前記温度検知手段の温
度により決定する設定手段を備えたものである。To achieve the above object, the first object of the present invention is to provide a container for containing a liquid, a temperature detecting device for detecting the temperature of the liquid in the container,
Heating means for heating the liquid in the container, energizing means for energizing the heating means, measuring means for measuring a temperature gradient by the input of the temperature detecting means, and comparing the temperature gradient with a comparison value, the energizing Comparing means for controlling the operation of the means,
It is provided with driving means for driving the energizing means at the time of boiling water or keeping the temperature and setting means for determining the comparison value of the comparing means according to the temperature of the temperature detecting means.
【００１１】第２の課題解決手段は、第１の課題解決手
段に加え、容器内の液体の加熱を開始させる加熱開始手
段と、前記加熱開始手段の入力により設定手段が比較値
を決定するものである。The second problem solving means is, in addition to the first problem solving means, a heating start means for starting the heating of the liquid in the container, and a setting means for determining the comparison value by the input of the heating start means. Is.
【００１２】第３の課題解決手段は、第２の課題解決手
段における加熱開始手段を、保温温度より容器内の液体
温度が低下すると加熱を開始させるようにしたものであ
る。A third means for solving the problem is a means for starting the heating in the means for solving the second problem so that the heating is started when the temperature of the liquid in the container becomes lower than the heat retention temperature.
【００１３】第４の課題解決手段は、第２又は第３の課
題解決手段における加熱開始手段の入力により、加熱手
段への通電をオンオフさせるオンオフ手段を備えたもの
である。The fourth problem solving means is provided with an on / off means for turning on / off the energization to the heating means by the input of the heating starting means in the second or third problem solving means.
【００１４】第５の課題解決手段は、第２、第３又は第
４の課題解決手段における温度検知手段で所定温度以上
の低下を検知すると、加熱開始手段による加熱の開始を
行う制御手段を備えたものである。A fifth problem solving means is provided with a control means for starting heating by the heating starting means when the temperature detecting means in the second, third or fourth problem solving means detects a decrease of a predetermined temperature or more. It is a thing.
【００１５】[0015]
【作用】第１の課題解決手段では、温度検知手段の検出
温度により比較値を決定し、この比較値と温度勾配とを
比較し、温度勾配が比較値を超えれば空焼き状態と判断
し、加熱手段による加熱を停止する。つまり、空焼き状
態では温度検知手段で検知する温度勾配が通常の場合に
より大きくなるが、検知している温度により温度検知手
段の特性が異なるため、空焼き状態かを判断する温度勾
配（比較値）を検知している温度により変える必要があ
る。そこで、温度の高低に応じて比較値を変え、空焼き
を判断する精度を高めている。In the first means for solving the problem, the comparison value is determined according to the temperature detected by the temperature detecting means, the comparison value is compared with the temperature gradient, and if the temperature gradient exceeds the comparison value, it is judged that it is in the air-baked state. The heating by the heating means is stopped. That is, in the air-baked state, the temperature gradient detected by the temperature detection means is larger than in the normal case, but since the characteristics of the temperature detection means differ depending on the detected temperature, the temperature gradient (compared value ) Needs to be changed depending on the temperature being detected. Therefore, the comparison value is changed according to the temperature level to improve the accuracy of determining the idle burning.
【００１６】第２の課題解決手段では、加熱開始手段で
加熱を開始すると、設定手段は温度検知手段で検知した
温度に基づいて比較値を決定し、この比較値に基づいて
空焼きの判定を行う。例えば、加熱開始手段を湯沸かし
動作を開始するスタート手段とすると、このスタート手
段による加熱動作を開始させると、空焼き検知を同時に
行う。In the second means for solving the problem, when the heating is started by the heating starting means, the setting means determines a comparison value based on the temperature detected by the temperature detecting means, and the determination of the baking is made based on the comparison value. To do. For example, when the heating start means is a start means for starting the boiling water operation, when the heating operation by the start means is started, the air-bake detection is simultaneously performed.
【００１７】第３の課題解決手段では、保温温度より低
下すると加熱を開始し、保温温度に達すると加熱を停止
して保温温度を維持するが、この保温時における加熱動
作を開始するタイミングは加熱開始手段で行い、しか
も、加熱開始手段が動作する度に設定手段による比較値
を決定し、この比較値に基づいて比較手段が空焼きを判
定するようにしている。In the third means for solving the problem, heating is started when the temperature falls below the heat retention temperature, and when the heat retention temperature is reached, the heating is stopped and the heat retention temperature is maintained. The comparison is performed by the starting means, and the comparison value by the setting means is determined every time the heating start means operates, and the comparison means determines the baking based on the comparison value.
【００１８】第４の課題解決手段では、加熱開始手段の
入力により空焼きを判定するとともに、オンオフ手段が
加熱手段への通電をオンオフさせる。この加熱手段への
通電をオンオフすることによって、温度検知手段で検知
する温度が容器温度に近づく。つまり、加熱手段のオフ
時には、加熱手段付近から容器全体に温度が広がり、加
熱手段と離して容器に設置した温度検知手段は容器温度
を正確に検知することができ、温度検知手段の温度勾配
を容器温度の勾配として正確に検出する。In the fourth means for solving the problem, the on-off means turns on / off the energization to the heating means while determining whether or not the firing is performed by the input of the heating start means. By turning on / off the power supply to the heating means, the temperature detected by the temperature detection means approaches the container temperature. That is, when the heating means is off, the temperature spreads from the vicinity of the heating means to the entire container, and the temperature detecting means installed in the container apart from the heating means can accurately detect the container temperature, and the temperature gradient of the temperature detecting means is Accurately detect the gradient of the vessel temperature.
【００１９】第５の課題解決手段では、温度検知手段で
所定温度以上の低下を検知すると、制御手段は加熱開始
手段による加熱の開始を行う。つまり、湯沸かしあるい
は保温中に水を追加投入した場合、温度検知手段で所定
温度以上の低下を検知することになる。水の追加投入に
よる温度低下が大きくなると、比較値を変更して空焼き
判定を正確に行う必要があるので、加熱開始手段を再度
動作させ、設定手段による比較値の決定を再度行う。In the fifth means for solving the problem, when the temperature detecting means detects a decrease of a predetermined temperature or more, the control means causes the heating start means to start heating. That is, when water is additionally charged while boiling water or keeping warm, the temperature detecting means detects a decrease above a predetermined temperature. When the temperature drop due to the additional addition of water becomes large, it is necessary to change the comparison value and accurately determine the firing condition. Therefore, the heating start means is operated again and the comparison value is determined again by the setting means.
【００２０】[0020]
（実施例１）以下、本発明の第１の実施例について図１
を参照しながら説明する。Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
Will be described with reference to.
【００２１】図１は本発明の第１の実施例の電気湯沸か
し器のブロック図で、１は液体を収容する容器、２は容
器１の底部に当接し、容器１内の液体を加熱する加熱手
段で、具体的にはヒータ等の発熱体がある。また、加熱
手段２を誘導加熱源としてもよい。３は容器１底部に当
接され、容器１内の液体の温度を検知する温度検知手
段、４は加熱手段２へ通電する通電手段である。FIG. 1 is a block diagram of an electric water heater according to a first embodiment of the present invention. 1 is a container for containing a liquid, 2 is a heating means for contacting the bottom of the container 1 and heating the liquid in the container 1. Then, specifically, there is a heating element such as a heater. Further, the heating means 2 may be an induction heating source. Reference numeral 3 is a temperature detecting means that is in contact with the bottom of the container 1 and that detects the temperature of the liquid in the container 1. Reference numeral 4 is an energizing means that energizes the heating means 2.
【００２２】９は加熱開始手段で、容器１内の液体の加
熱を開始させる方法の全てに適合し、例えば、強制的に
加熱を開始させる開始スイッチであったり、また、温度
検知手段３の入力が所定の温度（例えば90℃）未満にな
ると自動的に加熱を開始させる自動沸騰手段であった
り、さらに、保温温度より低下すると加熱を開始させる
温度調整装置であったりする。Reference numeral 9 denotes a heating starting means, which is suitable for all the methods for starting the heating of the liquid in the container 1, for example, a start switch for forcibly starting the heating, or an input of the temperature detecting means 3. May be an automatic boiling means for automatically starting heating when the temperature becomes lower than a predetermined temperature (for example, 90 ° C.), or a temperature adjusting device for starting heating when the temperature becomes lower than the heat retention temperature.
【００２３】５は駆動手段、６は設定手段、７は測定手
段であり、各手段は以下のような動作を行う。駆動手段
５は、加熱開始手段９によって加熱開始すると、設定手
段６を駆動すると同時に通電手段４に通電し、容器１内
の液体が沸騰するのを検知するまで通電手段４により加
熱手段２に通電する。Reference numeral 5 is a driving means, 6 is a setting means, and 7 is a measuring means. Each means operates as follows. When the heating means 9 starts heating, the driving means 5 drives the setting means 6 and at the same time energizes the energizing means 4, and energizes the heating means 2 by the energizing means 4 until it detects that the liquid in the container 1 boils. To do.
【００２４】設定手段６は、加熱手段２の駆動時におけ
る温度検知手段３の入力により、容器１内の液体の有無
を判別するため、温度区分ごとに単位温度上昇に要する
時間（以下、比較値と称す）を設定している。本実施例
では、温度を３区分し、80℃未満の温度区分では0.6
秒、80〜90℃の温度区分では1.2秒、90℃以上の温度区
分では2.0秒としている。The setting means 6 determines the presence or absence of the liquid in the container 1 by the input of the temperature detecting means 3 when the heating means 2 is driven. It is set). In this embodiment, the temperature is divided into three, and 0.6 in the temperature division below 80 ° C.
Second, it is 1.2 seconds in the temperature category of 80 to 90 ° C and 2.0 seconds in the temperature category of 90 ° C or higher.
【００２５】測定手段７は、温度検知手段３の入力によ
り得られた温度から所定の単位温度（本実施例では約0.
5℃） 毎の上昇する時間を測定するものである。この測
定手段７と設定手段６の出力を入力する比較手段８は、
測定手段７の測定時間と設定手段６で設定された比較値
を比較し、測定時間の方が比較値より短いことを検知す
ると、空焼きと判定して通電手段４を停止させるもので
ある。The measuring means 7 uses the temperature obtained by the input of the temperature detecting means 3 to obtain a predetermined unit temperature (about 0.
It measures the rising time every 5 ℃. The comparing means 8 for inputting the outputs of the measuring means 7 and the setting means 6,
When the measurement time of the measurement means 7 is compared with the comparison value set by the setting means 6, and when it is detected that the measurement time is shorter than the comparison value, it is judged that the firing is incomplete and the energization means 4 is stopped.
【００２６】図２は本発明の第１の実施例の電気湯沸か
し器の回路図である。図２において、10は交流電源、11
は直流電源である。前記加熱手段２は、容器１内の液体
を加熱する第１の発熱体2aと、第１の発熱体2aよりも加
熱電力が小さく容器１内の液体を加熱保温する第２の発
熱体2bで構成される。通電手段４は加熱手段２のそれぞ
れの発熱体2a,2bと交流電源10との間には、リレ−接点4
a，4bを直列に接続している。リレ−接点4a，4bの制御
を行なうリレ−コイル4c，4dに電流が流れると、リレ−
接点4a,4bが閉じるようになっている。FIG. 2 is a circuit diagram of the electric water heater according to the first embodiment of the present invention. In FIG. 2, 10 is an AC power supply, and 11
Is a DC power supply. The heating means 2 includes a first heating element 2a that heats the liquid in the container 1 and a second heating element 2b that heats and keeps the liquid in the container 1 with less heating power than the first heating element 2a. Composed. The energizing means 4 has relay contacts 4 between the heating elements 2a, 2b of the heating means 2 and the AC power source 10.
a and 4b are connected in series. When current flows through the relay coils 4c and 4d that control the relay contacts 4a and 4b, the relay contacts 4a and 4b are released.
The contacts 4a and 4b are adapted to be closed.
【００２７】温度検知手段３は、温度を抵抗値に変換す
る感温素子3aと、この感温素子3aの値を２進符号に変換
するAD変換器3bで構成されている。加熱開始手段９の加
熱開始スイッチは、この入力により通電手段４を強制的
に再通電させることが可能となるもので、スイッチ9aと
抵抗9b，9cで構成され、スイッチのオンオフで信号を送
る。12は表示手段で、容器１内の状態が加熱中，保温
中，あるいは空焼き検知中などを外部に知らせるもの
で、ＬＥＤなどを用いて構成している。13はマイクロコ
ンピュータ（以後マイコンと略する）である。The temperature detecting means 3 comprises a temperature sensitive element 3a for converting the temperature into a resistance value and an AD converter 3b for converting the value of the temperature sensitive element 3a into a binary code. The heating start switch of the heating start means 9 can force the energization means 4 to be re-energized by this input, and is composed of a switch 9a and resistors 9b and 9c, and sends a signal by turning the switch on and off. Reference numeral 12 is a display means for notifying the outside of the state of the inside of the container 1 such as heating, keeping warm, or detecting burning out, and is constituted by using an LED or the like. 13 is a microcomputer (hereinafter abbreviated as a microcomputer).
【００２８】図３は本発明の第１の実施例のマイコン13
に記憶されたプログラムの温度制御部分のフローチャー
トを示したもので、これを実行することで駆動手段５，
設定手段６，測定手段７，比較手段８の制御方法を実現
している。以下、この動作を説明する。FIG. 3 shows the microcomputer 13 of the first embodiment of the present invention.
The flowchart of the temperature control part of the program stored in FIG.
The control method of the setting means 6, the measuring means 7, and the comparing means 8 is realized. Hereinafter, this operation will be described.
【００２９】保温の温度制御中（ステップ１，２）や電
源投入時などで温度が所定の温度以下であったり、加熱
開始スイッチが入力されたりすると（ステップ３）、加
熱手段２を駆動（ステップ４）し、それと同時にこの時
の温度検知手段３の検知温度により、空焼き判定の比較
値を設定する（ステップ５）。When the temperature is below a predetermined temperature during heating temperature control (steps 1 and 2) or when the power is turned on, or when the heating start switch is input (step 3), the heating means 2 is driven (step 3). 4) At the same time, the comparison value for the baking determination is set based on the temperature detected by the temperature detecting means 3 at this time (step 5).
【００３０】そして、温度検知手段３の入力により測定
手段７が単位温度上昇するごとの時間を測定し、比較手
段８でこの比較値と単位温度上昇に要した時間とを比較
して（ステップ６，７，８）、比較値の方が大きいとき
には前記加熱手段を停止させ（ステップ９）、比較値の
方が小さいときには、測定手段８をクリアし（ステップ
12）、新たな単位温度上昇する時間を計時する。一方、
ステップ７で単位温度上昇が検知されないときには、ス
テップ10で沸騰を検知したかどうか判定される。Then, by the input of the temperature detecting means 3, the measuring means 7 measures the time each time the unit temperature rises, and the comparing means 8 compares this comparison value with the time required for raising the unit temperature (step 6). , 7, 8), the heating means is stopped when the comparison value is larger (step 9), and the measurement means 8 is cleared when the comparison value is smaller (step 9).
12) Time the new unit temperature rise. on the other hand,
When the unit temperature rise is not detected in step 7, it is determined in step 10 whether boiling is detected.
【００３１】本実施例において、沸騰検知は沸点に到達
すると温度上昇がなくなることを利用して、空焼き検知
とは逆に測定手段７がクリアされずに、ある特定時間
（本実施例では20秒とする。）経過したことで検知する
ものであり、ステップ10で沸騰検知すれば、加熱手段２
を停止させてステップ１に戻り、沸騰検知してなけれ
ば、ステップ６でさらに測定手段７が計時を続けるよう
に構成してある。In the present embodiment, the boiling detection takes advantage of the fact that the temperature does not rise when the boiling point is reached. Contrary to the air-burning detection, the measuring means 7 is not cleared and a certain specific time (20 It is detected by the elapse of time. If the boiling is detected in step 10, the heating means 2
Is stopped and the process returns to step 1, and if boiling detection is not performed, the measuring means 7 is further configured to continue counting time in step 6.
【００３２】以上のように第１の実施例によれば、簡単
な構成で湯沸し開始時の温度によって温度上昇勾配の比
較値を変えることで、速やかに容器内に水のないことを
検知することができる。As described above, according to the first embodiment, it is possible to promptly detect the absence of water in the container by changing the comparative value of the temperature rising gradient according to the temperature at the start of boiling with a simple structure. You can
【００３３】（実施例２）本発明の第２の実施例につい
て図４および図５を参照にしながら説明する。なお、第
１の実施例で説明したものと同一構成部材については同
一番号を用いて、その説明を省略する。(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. 4 and 5. The same components as those described in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
【００３４】図４は本発明の第２の実施例の電気湯沸か
し器のブロック図で、第１の実施例と異なるところは、
オンオフ手段10が追加されているところで、加熱開始手
段９の入力により加熱を開始すると、通電手段４を第１
の所定時間（本実施例では10秒とする）通電し、その
後、第２の所定時間（本実施例では８秒間とする）通電
を停止させる。そして第１の所定時間と第２の所定時間
経過した後で、駆動手段５を駆動するように構成してい
る。FIG. 4 is a block diagram of an electric water heater according to a second embodiment of the present invention. The differences from the first embodiment are as follows.
When the on / off means 10 is added and the heating is started by the input of the heating start means 9, the energizing means 4 is turned on first.
Is energized for a predetermined time (10 seconds in this embodiment), and then energization is stopped for a second predetermined time (8 seconds in this embodiment). Then, the drive means 5 is configured to be driven after the first predetermined time and the second predetermined time have elapsed.
【００３５】図５は第２の実施例のマイコン13に記憶さ
れたプログラムの温度制御部分のフロ−チャ−トを示し
たもので、これによって動作を説明する。FIG. 5 shows the flow chart of the temperature control portion of the program stored in the microcomputer 13 of the second embodiment, and the operation will be described with this.
【００３６】図３と同様に、保温の温度制御中（ステッ
プ21，22）や電源投入時などで温度が所定の温度以下で
あったり、加熱開始スイッチが入力されたりすると（ス
テップ23）、加熱手段２を駆動（ステップ24）し、この
駆動している時間が第１の所定時間経過するのを測定す
る（ステップ25，26）。第１の所定時間を経過すると、
加熱手段２を停止させ（ステップ27）、ステップ28，29
で第２の所定時間経過するまで時間を計時する。第２の
所定時間が計時されると、加熱手段２を再駆動（ステッ
プ30）すると同時に、この時の温度検知手段３の検知温
度により、空焼き判定の比較値を設定する。Similar to FIG. 3, if the temperature is lower than a predetermined temperature during the temperature control of the heat retention (steps 21 and 22) or when the power is turned on, or if the heating start switch is input (step 23), the heating is performed. The means 2 is driven (step 24), and it is measured that this driving time elapses a first predetermined time (steps 25 and 26). When the first predetermined time has passed,
The heating means 2 is stopped (step 27), and steps 28 and 29 are performed.
Then, the time is measured until the second predetermined time elapses. When the second predetermined time is timed, the heating means 2 is re-driven (step 30), and at the same time, the comparison value for the baking determination is set based on the temperature detected by the temperature detection means 3 at this time.
【００３７】そして、温度検知手段３の入力により測定
手段７が単位温度上昇するごとの時間を測定し、比較手
段８でこの比較値と温度上昇時間を比較して（ステップ
32，33，34）、比較値の方が大きいときには加熱手段２
を停止させ（ステップ35）、比較値の方が小さいときに
は、測定手段８をクリアし（ステップ38）、新たな単位
温度上昇するのに要する時間を計時する。Then, the time at which the measuring means 7 rises in unit temperature is measured by the input of the temperature detecting means 3, and the comparing means 8 compares this comparison value with the temperature rising time (step
32, 33, 34), heating means 2 when the comparison value is larger
Is stopped (step 35), and when the comparison value is smaller, the measuring means 8 is cleared (step 38) and the time required to raise a new unit temperature is measured.
【００３８】一方、ステップ33で単位温度上昇が検知さ
れないときには、ステップ36ですでに前述している方法
で沸騰を検知したかどうか判定し、ステップ36で沸騰検
知すれば、加熱手段２を停止させてステップ21に戻り、
沸騰検知してなければ、ステップ32でさらに測定手段が
計時を続けるように構成してある。On the other hand, when the unit temperature rise is not detected in step 33, it is judged in step 36 whether or not boiling has been detected by the method described above. If boiling is detected in step 36, the heating means 2 is stopped. And go back to step 21,
If the boiling is not detected, the measuring means is further configured to continue the time counting in step 32.
【００３９】以上のように第２の実施例によれば、簡単
な構成で加熱開始時の加熱手段をオンオフさせてやるこ
とで、温度検知手段の検知温度と容器の温度との追従性
を良くすることができ、速やかに空焼き検知を行わせる
ことができる。As described above, according to the second embodiment, since the heating means at the start of heating is turned on / off with a simple structure, the followability between the temperature detected by the temperature detecting means and the temperature of the container is improved. Therefore, it is possible to promptly detect the burnout.
【００４０】（実施例３）本発明の第３の実施例につい
て図６および図７を参照にしながら説明する。なお、第
１および第２の実施例で説明したものと同一構成部材に
ついては同一番号を用いて、その説明を省略する。(Third Embodiment) A third embodiment of the present invention will be described with reference to FIGS. 6 and 7. The same components as those described in the first and second embodiments are designated by the same reference numerals and the description thereof will be omitted.
【００４１】図６は本発明の第３の実施例の電気湯沸か
し器のブロック図で、第２の実施例と異なるところは、
制御手段11が追加されているところで、制御手段11は加
熱中に特定の温度低下勾配（本実施例では約２℃とす
る）を検知すると、オンオフ手段10を再駆動させるよう
にしたものである。これによって、加熱中に容器１内に
水が追加されたことを検知して、そのときの温度に合わ
せて比較値を再設定することができるようにしてある。FIG. 6 is a block diagram of an electric water heater according to a third embodiment of the present invention. The differences from the second embodiment are as follows.
Where the control means 11 is added, the control means 11 restarts the on / off means 10 when it detects a specific temperature decrease gradient (about 2 ° C. in this embodiment) during heating. . This makes it possible to detect the addition of water in the container 1 during heating and reset the comparison value according to the temperature at that time.
【００４２】図７は第３の実施例のマイコン13に記憶さ
れたプログラムの温度制御部分のフロ−チャ−トを示し
たもので、これによって動作を説明する。図３および図
５と同様に、保温の温度制御中（ステップ41，42）や電
源投入時などで温度が所定の温度以下であったり、加熱
開始スイッチが入力されたりすると（ステップ43）、前
記加熱手段２を駆動（ステップ44）し、この駆動してい
る時間が第１の所定時間経過するのを測定する（ステッ
プ45，46）。第１の所定時間を経過すると、前記加熱手
段２を停止させ（ステップ47）、ステップ48，49で第２
の所定時間経過するまで時間を計時する。第２の所定時
間が計時されると、前記加熱手段２を再駆動（ステップ
50）すると同時にこの時の前記温度検知手段３の検知温
度により、空焼き判定の比較値を設定する。FIG. 7 shows the flow chart of the temperature control portion of the program stored in the microcomputer 13 of the third embodiment, and the operation will be described with reference to this. Similar to FIG. 3 and FIG. 5, when the temperature is lower than a predetermined temperature during heating temperature control (steps 41 and 42) or when the power is turned on, or when the heating start switch is input (step 43), The heating means 2 is driven (step 44), and it is measured that this driving time has passed a first predetermined time (steps 45, 46). When the first predetermined time has passed, the heating means 2 is stopped (step 47), and the second heating is performed in steps 48 and 49.
The time is measured until the predetermined time of. When the second predetermined time is timed, the heating means 2 is re-driven (step
At the same time as 50), the comparison value for the baking determination is set according to the temperature detected by the temperature detecting means 3 at this time.
【００４３】次に、ステップ52で前記温度検知手段３の
入力におり特定の温度低下が検知されたか否かを判断
し、温度低下が検知されておればステップ45に戻って第
１の所定時間後に前記加熱手段２を停止させるようにす
る。Next, in step 52, it is judged whether or not a specific temperature drop is detected by the input of the temperature detecting means 3, and if the temperature drop is detected, the process returns to step 45 and the first predetermined time is passed. After that, the heating means 2 is stopped.
【００４４】ステップ52で温度低下が検知されていなけ
れば、前記温度検知手段３の入力により前記測定手段７
が単位温度上昇するごとの時間を測定し、前記比較手段
８でこの比較値と温度上昇時間を比較して（ステップ5
3，54，55）、比較値の方が大きいときには前記加熱手
段を停止させ（ステップ56）、比較値の方が小さいとき
には、前記測定手段８をクリアし（ステップ59）、新た
な単位温度上昇する時間を計時する。一方、ステップ54
で単位温度上昇が検知されないときには、ステップ57で
すでに前述している方法で沸騰を検知したかどうか判定
し、ステップ57で沸騰検知すれば、前記加熱手段２を停
止させてステップ41に戻り、沸騰検知してなければ、ス
テップ52でさらに前記測定手段が計時を続けるように構
成してある。If the temperature drop is not detected in step 52, the measuring means 7 is operated by the input of the temperature detecting means 3.
Measures the time each time the unit temperature rises, and the comparison means 8 compares this comparison value with the temperature rise time (step 5
3, 54, 55), when the comparison value is larger, the heating means is stopped (step 56), and when the comparison value is smaller, the measuring means 8 is cleared (step 59), and a new unit temperature rise is made. Clock the time. Meanwhile, step 54
When the unit temperature rise is not detected in step 57, it is determined in step 57 whether or not boiling has been detected by the method described above. If boiling is detected in step 57, the heating means 2 is stopped and the process returns to step 41. If boiling has not been detected, the measuring means is further arranged to continue the timekeeping in step 52.
【００４５】以上のように第３の実施例によれば、加熱
中の水の増加に応じて比較値を適宜変化させてやるの
で、正しく空焼きが検知できるようになっている。As described above, according to the third embodiment, the comparison value is appropriately changed according to the increase in water during heating, so that it is possible to correctly detect the firing.
【００４６】なお、第１の所定の時間通電する加熱手段
および第２の所定時間後に加熱する加熱手段の制御は、
第１の発熱体のみでも第１および第２の発熱体両方とも
通電することも可能である。Control of the heating means for energizing for the first predetermined time and the heating means for heating after the second predetermined time are as follows.
It is possible to energize only the first heating element or both the first and second heating elements.
【００４７】また、第１の所定時間および第２の所定時
間は容器の底部の受感によって適宜時間を変えることが
できる。The first predetermined time and the second predetermined time can be appropriately changed depending on the feeling of the bottom of the container.
【００４８】また、本実施例では、加熱手段２の再駆動
時の温度によって比較値を設定しているが、第１の所定
時間および第２の所定時間中に比較値を決定することも
容易に行うことができる。In the present embodiment, the comparison value is set according to the temperature when the heating means 2 is re-driven, but it is also easy to determine the comparison value during the first predetermined time and the second predetermined time. Can be done.
【００４９】また、比較値設定の温度区分は本実施例で
は３区分としているが、これはさらに細分化することも
容易に行うことができる。Further, although the temperature division for setting the comparison value is set to 3 divisions in the present embodiment, this can be easily subdivided.
【００５０】また、本実施例では測定手段により単位温
度上昇するのに要する時間を測定して空焼き判定を行う
ようにしているが、単位温度上昇するのに要する時間に
代えて単位時間当たりの上昇温度を測定するようにして
も良く、温度勾配を測定できる構成であれば良い。Further, in the present embodiment, the time required for the unit temperature to rise is measured by the measuring means to determine the firing condition. However, instead of the time required to raise the unit temperature, The temperature rise may be measured, as long as the temperature gradient can be measured.
【００５１】[0051]
【発明の効果】上記実施例の説明から明かなように、請
求項１の発明によれば、設定手段により温度の高低に応
じて比較値を決定し空焼きを判断するので、温度検知手
段の特性、加熱手段の加熱容量の大容量化に対応して、
その空焼き検知精度を高めることができる。As is apparent from the description of the above embodiment, according to the invention of claim 1, the setting means determines the comparison value in accordance with the temperature level and determines the firing, so that the temperature detecting means Characteristic, corresponding to the increase in heating capacity of the heating means,
It is possible to improve the accuracy of detection of the dry burning.
【００５２】請求項２の発明によれば、加熱開始手段で
加熱動作を開始すると空焼き検知を行うので、空焼き状
態になり得る加熱開始時点からの空焼き検知が可能とな
り、早期の内に空焼きを検知することができる。例え
ば、誤って容器内に水を入れずに加熱動作を開始した場
合にも、加熱開始からすぐに空焼きを検知でき、容器を
過熱してしまうことがない。According to the invention of claim 2, when the heating operation is started by the heating starting means, the air-baking is detected. Therefore, it is possible to detect the air-baking from the time when the heating is started, which may result in the air-baked state. Bake-out can be detected. For example, even if the heating operation is started by mistake without introducing water into the container, the baking can be detected immediately after the heating is started, and the container is not overheated.
【００５３】請求項３の発明によれば、保温中に給湯し
て容器内のお湯がなくなってしまった場合においても、
加熱開始からすぐに空焼き検知を行うので、湯のなくな
った容器を空焼きしてしまうのを早期の内に検知するこ
とができる。According to the invention of claim 3, even when the hot water in the container is exhausted by supplying hot water while keeping warm,
Since the bake-out detection is performed immediately after the start of heating, it is possible to detect the bake-out of the container that has run out of hot water in an early stage.
【００５４】請求項４の発明によれば、加熱開始手段の
入力により空焼きを判定するとともに、オンオフ手段が
加熱手段への通電をオンオフさせるので、温度検知手段
の検知温度が容器温度として正確に検知し、温度検知手
段の温度勾配を容器温度の勾配として正確に検出して空
焼き検知精度を高めることができる。According to the fourth aspect of the present invention, the on-off means turns on and off the energization to the heating means while determining whether or not the heating is started by inputting the heating start means. Therefore, the temperature detected by the temperature detection means is accurately determined as the container temperature. It is possible to improve the accuracy of the baking detection by detecting and accurately detecting the temperature gradient of the temperature detecting means as the gradient of the container temperature.
【００５５】請求項５の発明によれば、水の追加投入に
よる温度低下が大きくなっても、空焼きを判定する比較
値を低下した後の温度により決定するので、空焼き判定
を正確に行うことができる。According to the fifth aspect of the present invention, even if the temperature drop due to the addition of water becomes large, the comparison value for determining the firing is determined by the temperature after the reduction, so the firing determination is accurately performed. be able to.
【図１】本発明の第１の実施例の電気湯沸かし器のブロ
ック図FIG. 1 is a block diagram of an electric water heater according to a first embodiment of the present invention.
【図２】同電気湯沸かし器の回路図FIG. 2 is a circuit diagram of the electric water heater.
【図３】同電気湯沸かし器の動作を示すフローチャートFIG. 3 is a flowchart showing the operation of the electric water heater.
【図４】本発明の第２の実施例の電気湯沸かし器のブロ
ック図FIG. 4 is a block diagram of an electric water heater according to a second embodiment of the present invention.
【図５】同電気湯沸かし器の動作を示すフロ−チャ−トFIG. 5 is a flowchart showing the operation of the electric water heater.
【図６】本発明の第３の実施例の電気湯沸かし器のブロ
ック図FIG. 6 is a block diagram of an electric water heater according to a third embodiment of the present invention.
【図７】同電気湯沸かし器の動作を示すフロ−チャ−トFIG. 7 is a flow chart showing the operation of the electric water heater.
【図８】従来の電器湯沸かし器の要部断面図FIG. 8 is a sectional view of a main part of a conventional electric water heater.
【図９】同電気湯沸かし器の温度センサーの検知温度と
容器内部の温度と温度センサー周辺の雰囲気温度を示す
特性図FIG. 9 is a characteristic diagram showing the temperature detected by the temperature sensor of the electric water heater, the temperature inside the container, and the ambient temperature around the temperature sensor.
１ 容器 ２ 加熱手段 ３ 温度検知手段 ４ 通電手段 ５ 駆動手段 ６ 設定手段 ７ 測定手段 ８ 比較手段 ９ 加熱開始手段 10 オンオフ手段 11 制御手段 1 container 2 heating means 3 temperature detecting means 4 energizing means 5 driving means 6 setting means 7 measuring means 8 comparing means 9 heating starting means 10 on / off means 11 control means
Claims (5)
体温度を検知する温度検知手段と、前記容器内の液体を
加熱する加熱手段と、前記加熱手段へ通電する通電手段
と、前記温度検知手段の入力により温度勾配を測定する
測定手段と、この温度勾配を比較値と比較し、前記通電
手段の動作を制御する比較手段と、湯沸かしあるいは保
温時に前記通電手段を駆動する駆動手段と、前記比較手
段の比較値を前記温度検知手段の温度により決定する設
定手段を備えた電気湯沸かし器。1. A container for containing a liquid, a temperature detecting means for detecting a liquid temperature in the container, a heating means for heating the liquid in the container, an energizing means for energizing the heating means, and the temperature. Measuring means for measuring the temperature gradient by inputting the detecting means, comparing this temperature gradient with a comparison value, comparing means for controlling the operation of the energizing means, and driving means for driving the energizing means at the time of boiling water or keeping warm, An electric water heater equipped with setting means for determining the comparison value of the comparing means according to the temperature of the temperature detecting means.
始手段を備え、前記加熱開始手段の入力により設定手段
が比較値を決定する請求項１記載の電気湯沸かし器。2. The electric water heater according to claim 1, further comprising heating start means for starting the heating of the liquid in the container, wherein the setting means determines the comparison value by an input of the heating start means.
体温度が低下すると、加熱を開始させるようにした請求
項３記載の電気湯沸かし器。3. The electric water heater according to claim 3, wherein the heating start means starts heating when the temperature of the liquid in the container falls below the heat retention temperature.
の通電をオンオフさせるオンオフ手段を備えた請求項２
または３記載の電気湯沸かし器。4. An on / off means for turning on / off energization to the heating means by inputting the heating start means.
Or the electric water heater described in 3.
知すると、加熱開始手段による加熱の開始を行う制御手
段を備えた請求項２〜４のいずれか１項に記載の電気湯
沸かし器。5. The electric water heater according to claim 2, further comprising control means for starting heating by the heating start means when the temperature detection means detects a decrease in temperature above a predetermined temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18521795A JP3178306B2 (en) | 1995-07-21 | 1995-07-21 | Electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18521795A JP3178306B2 (en) | 1995-07-21 | 1995-07-21 | Electric water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0928569A true JPH0928569A (en) | 1997-02-04 |
| JP3178306B2 JP3178306B2 (en) | 2001-06-18 |
Family
ID=16166933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18521795A Expired - Fee Related JP3178306B2 (en) | 1995-07-21 | 1995-07-21 | Electric water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3178306B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107157316A (en) * | 2016-03-07 | 2017-09-15 | 广东美的生活电器制造有限公司 | A kind of liquid heating, electric hot water bottle and its anti-dry control method |
-
1995
- 1995-07-21 JP JP18521795A patent/JP3178306B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107157316A (en) * | 2016-03-07 | 2017-09-15 | 广东美的生活电器制造有限公司 | A kind of liquid heating, electric hot water bottle and its anti-dry control method |
| CN107157316B (en) * | 2016-03-07 | 2023-05-30 | 广东美的生活电器制造有限公司 | Liquid heating device, electric hot water bottle and dry heating prevention control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3178306B2 (en) | 2001-06-18 |
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