JP3227962B2 - Electric water heater - Google Patents
Electric water heaterInfo
- Publication number
- JP3227962B2 JP3227962B2 JP32910593A JP32910593A JP3227962B2 JP 3227962 B2 JP3227962 B2 JP 3227962B2 JP 32910593 A JP32910593 A JP 32910593A JP 32910593 A JP32910593 A JP 32910593A JP 3227962 B2 JP3227962 B2 JP 3227962B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- heating
- container
- boiling
- heat retaining
- 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.)
- Expired - Fee Related
Links
Landscapes
- Cookers (AREA)
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の保温温度制御に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to controlling the temperature of an electric water heater for heating and maintaining the temperature of a liquid contained in a container.
【０００２】[0002]
【従来の技術】従来、電気湯沸かし器の保温温度設定は
連続沸騰の恐れのない温度を予め設定しておき、この設
定温度になるように保温制御をしている。これは、沸騰
検出時の温度よりも一定温度低い値を決定することが困
難であったためである。2. Description of the Related Art Heretofore, for setting a temperature for keeping an electric water heater warm, a temperature at which there is no fear of continuous boiling is set in advance, and the temperature is controlled so as to reach this set temperature. This is because it was difficult to determine a value lower by a certain temperature than the temperature at the time of boiling detection.
【０００３】すなわち、温度検知手段の検知した液体温
度が、容器を介して液体の温度を間接的に検出してお
り、さらに温度検知手段を取り巻くように加熱手段が構
成され加熱手段の熱を受けやすい構成であるために実際
の液体温度とに差が生じてくるからである。また図７
(a)，(b)に示すとおり、水量が多いときと少ないときで
は沸騰検知時の温度検知手段の追従に差が生じてくる。
この他に加熱手段のワットや室温などにもよっても差が
でてくるからである。したがって、液体が沸騰したとき
の温度検知手段が検出した温度はばらつきを多く含んだ
ものとなっていた。That is, the temperature of the liquid detected by the temperature detecting means indirectly detects the temperature of the liquid via the container, and the heating means is arranged so as to surround the temperature detecting means, and receives the heat of the heating means. This is because the difference between the actual liquid temperature and the actual liquid temperature occurs due to the easy configuration. FIG.
As shown in (a) and (b), when the amount of water is large and when the amount of water is small, a difference occurs in the follow-up of the temperature detecting means at the time of boiling detection.
In addition to this, there is a difference depending on the watt of the heating means and the room temperature. Therefore, the temperature detected by the temperature detecting means when the liquid boils contains a lot of variation.
【０００４】[0004]
【発明が解決しようとする課題】したがって、このよう
な従来の構成では、沸騰時の温度検知手段の検知温度に
よって保温温度を決定することは困難である。そのため
に沸騰温度に関係なく一定の保温温度で保温しているた
め、熱い湯が欲しいときなどには再沸騰する必要があっ
た。また再沸騰時にはなるだけ短い時間で沸騰すること
が望まれている。Therefore, in such a conventional configuration, it is difficult to determine the heat retaining temperature based on the temperature detected by the temperature detecting means at the time of boiling. For this reason, since the temperature is kept at a constant temperature regardless of the boiling temperature, it is necessary to reboil when hot water is required. In addition, it is desired to boil in as short a time as possible during re-boiling.
【０００５】本発明は上記課題を解決するために沸騰温
度に温度検知手段の検知温度を近づけてやることで、従
来より保温温度を高くかつ沸騰しない温度に設定するこ
とを第１の目的とする。SUMMARY OF THE INVENTION It is a first object of the present invention to set the heat retention temperature higher than the conventional one and to a temperature that does not boil by bringing the temperature detected by the temperature detecting means closer to the boiling temperature in order to solve the above problem. .
【０００６】また、水量による補正値を設定してやるこ
とで、より安定した保温温度を設定することを第２の目
的とする。A second object is to set a more stable temperature by setting a correction value based on the amount of water.
【０００７】さらに設定された保温温度が低くなりすぎ
たときには連続沸騰しない高い温度に設定された所定温
度まで保温温度を上げて保温させることを第３の目的と
する。It is a third object of the present invention to increase the heat retention temperature to a predetermined high temperature that does not continuously boil when the set heat retention temperature becomes too low to keep the temperature.
【０００８】そして設定された保温温度が高くなりすぎ
て連続沸騰になると設定温度を下げて連続沸騰しない高
い温度で保温させることを第４の目的とする。A fourth object of the present invention is to lower the set temperature and keep the temperature at a high temperature that does not cause continuous boiling when the set temperature is too high and the boiling is continuous.
【０００９】[0009]
【課題を解決するための手段】上記第１の目的を解決す
るために本発明の第１の手段は、液体を収容する容器
と、前記容器内の液体を加熱する加熱手段と、前記容器
内の液体を加熱保温する保温手段と、前記加熱手段及び
前記保温手段の通電を制御する通電手段と、前記容器内
の液体温度を検知する温度検知手段と、電源が投入され
ると前記加熱手段を駆動する加熱開始手段と、前記温度
検知手段が検出した温度上昇勾配が所定値以下になると
前記加熱手段を停止させる沸騰検出手段と、前記沸騰検
知手段の検知結果に応じて前記加熱手段が停止して以降
第１の所定時間経過してから第２の所定時間経過するま
で前記保温手段を駆動し第２の所定時間経過時の前記温
度検知手段の検知温度から予め設定された設定値を差し
引いて保温温度を決定する温度設定手段と、前記設定さ
れた保温温度より前記温度検知手段の出力が低い間前記
保温手段を駆動する比較手段を備えたものである。In order to solve the above-mentioned first object, a first means of the present invention comprises a container for containing a liquid, a heating means for heating the liquid in the container, A heat retaining means for heating and retaining the liquid, an energizing means for controlling energization of the heating means and the heat retaining means, a temperature detecting means for detecting the temperature of the liquid in the container, and the heating means when power is turned on. A heating start unit to be driven; a boiling detection unit that stops the heating unit when a temperature rise gradient detected by the temperature detection unit becomes a predetermined value or less; and the heating unit stops according to a detection result of the boiling detection unit. Thereafter, the heat retaining means is driven until the second predetermined time has elapsed after the first predetermined time has elapsed, and a preset value is subtracted from the temperature detected by the temperature detecting means at the time when the second predetermined time has elapsed. Determine the heat retention temperature A temperature setting means for the output of said temperature detecting means from the retained temperature said set is that a comparator means for driving the lower between the heat insulating means.
【００１０】また、第２の目的を解決するために本発明
の第２の手段は、前記容器内の液体量を検知し水量に応
じて前記設定値の値を決定する水量検知手段を備えたも
のである。In order to solve the second object, the second means of the present invention includes a water amount detecting means for detecting a liquid amount in the container and determining the set value according to the water amount. Things.
【００１１】さらに、第３の目的を解決するために本発
明の第３の手段は、前記温度設定手段の設定した保温温
度と連続沸騰しない高い温度である所定温度を比較し前
記設定した保温温度の方が低ければ前記所定温度を保温
温度に変更する変更手段を設けたものである。Further, in order to solve the third object, a third means of the present invention compares the heat retention temperature set by the temperature setting means with a predetermined temperature which is a high temperature which does not cause continuous boiling. A change means is provided for changing the predetermined temperature to the heat retaining temperature if the set heat retaining temperature is lower.
【００１２】そして、第４の目的を解決するために本発
明の第４の手段は、前記比較手段が連続で前記保温手段
を駆動している時間を計時する計時手段と、前記計時手
段による計時時間が第３の所定時間経過すると連続沸騰
しない高い温度である所定温度を保温温度に変更する制
御手段を備えたものである。In order to solve the fourth object, a fourth means of the present invention comprises a time measuring means for measuring a time during which the comparing means continuously drives the heat retaining means, and a time measuring means for measuring the time. Continuous boiling when the time has passed the third predetermined time
It is provided with control means for changing a predetermined temperature, which is a high temperature not to be maintained, to a warming temperature.
【００１３】[0013]
【作用】本発明は前記した解決手段によって、加熱手段
が駆動されている間に温度上昇勾配がなくなると沸騰と
みなして加熱手段を停止し、第１の所定時間だけ待機す
ることにより加熱手段の熱による影響がなくなるので温
度検知手段の出力を容器底の温度に徐々に近づけること
ができる。また沸騰検出から一定時間後に水温に追従し
た温度を得るために、第２の所定時間まで加熱手段より
も温度検知手段への影響が少ない保温手段にて通電する
ことで、温度検知手段出力を早期に水温に近づけること
ができ、連続沸騰の恐れのない温度を考慮して予め設定
された値を差し引いて保温温度を求めることができる。According to the present invention, when the temperature rise gradient disappears while the heating means is being driven, the heating means is deemed to be boiling, the heating means is stopped, and the heating means is waited for a first predetermined time. Since the influence of heat is eliminated, the output of the temperature detecting means can be gradually brought closer to the temperature of the container bottom. In addition, in order to obtain a temperature following the water temperature after a certain period of time from the detection of boiling, the power is supplied to the heat retaining means having less influence on the temperature detecting means than the heating means until the second predetermined time, so that the output of the temperature detecting means can be early. The temperature can be approximated to the water temperature, and the heat retention temperature can be obtained by subtracting a preset value in consideration of the temperature at which there is no risk of continuous boiling.
【００１４】また、沸騰検知時の検知温度のばらつきの
最大要因になっている水量によって第２の所定時間経過
時の温度検知手段の出力を補正してやることで、第２の
所定時間を短時間にしてかつ安定した高温保温温度を設
定することができる。Further, the output of the temperature detecting means at the time when the second predetermined time has elapsed is corrected by the amount of water which is the largest cause of the variation in the detected temperature at the time of boiling detection, thereby shortening the second predetermined time. In addition, a stable high temperature keeping temperature can be set.
【００１５】さらに、加熱途中に水が追加されたことに
よって温度上昇がなくなり誤って沸騰を検出したために
保温温度が低く設定された場合には、連続沸騰の恐れの
ない所定温度で保温することができる。Further, when the temperature is not increased due to the addition of water during the heating and the temperature is set to a low temperature because the boiling is erroneously detected, the temperature may be maintained at a predetermined temperature at which there is no danger of continuous boiling. it can.
【００１６】そして、沸騰直前に水が追加されるなどの
要因で温度検知手段と液体の追従性の関係が変化してし
まい設定した保温温度が高くなりすぎて保温手段が連続
通電されるような場合になったとしてもある程度の時間
続くと設定温度を連続沸騰の恐れのない所定温度にして
やることで沸騰温度に近い高温で保温することができ
る。[0016] Then, the relationship between the temperature detecting means and the liquid following property changes due to factors such as the addition of water immediately before boiling, and the set heat retaining temperature becomes too high, so that the heat retaining means is continuously energized. Even if this occurs, the temperature can be maintained at a high temperature close to the boiling temperature by setting the set temperature to a predetermined temperature at which there is no danger of continuous boiling if it continues for a certain period of time.
【００１７】[0017]
【実施例】以下、本発明の一実施例を添付の図面で説明
する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.
【００１８】図１は本発明の一実施例を示す電気湯沸か
し器のブロック図で、１は液体を収容する容器，２は前
記容器に当接し容器内の液体を加熱する加熱手段、３は
前記容器に当接し容器内の液体を加熱保温する保温手
段、４は前記容器１に当接され容器内の液体の温度を検
知する温度検知手段、５は前記加熱手段２及び前記保温
手段３を通電する通電手段である。FIG. 1 is a block diagram of an electric water heater according to an embodiment of the present invention, wherein 1 is a container for containing a liquid, 2 is a heating means for contacting the container and heating the liquid in the container, and 3 is a container for the liquid. , A temperature detecting means for heating and keeping the liquid in the container in contact with the container 4; a temperature detecting means 4 for contacting with the container 1 for detecting the temperature of the liquid in the container; and 5 for energizing the heating means 2 and the heat keeping means 3. It is an energizing means.
【００１９】10は前記容器１の下部と上部を接続し容器
内の液体を通す水位管に取り付けられ容器内の水量を測
定する水量検知手段である。Reference numeral 10 denotes a water amount detecting means which connects the lower part and the upper part of the container 1 and is attached to a water level pipe through which the liquid in the container passes, and measures the amount of water in the container.
【００２０】６は電源投入されると前記通電手段５に前
記加熱手段２を駆動させる加熱開始手段、７は前記加熱
手段２が駆動されると前記温度検知手段４の出力によっ
て温度上昇勾配の変化量を測定して沸騰とみなすと前記
加熱手段２を停止させる沸騰検出手段、８は前記沸騰検
出手段７が沸騰を検出すると第１の所定時間経過するの
を待って第２の所定時間だけ前記保温手段３を駆動し、
前記保温手段３を停止させたときの前記温度検知手段４
の値から前記水量検知手段10の検知した水量によって予
め設定された値を差し引いた値に保温温度を決定する温
度設定手段、９は前記温度設定手段８が決定した温度と
前記温度検知手段４の出力を比較した決定した温度にな
るように前記保温手段３を制御する比較手段である。Reference numeral 6 denotes a heating start means for driving the heating means 2 by the energizing means 5 when the power is turned on, and 7 denotes a change in the temperature rise gradient by the output of the temperature detecting means 4 when the heating means 2 is driven. The boiling detecting means 8 which stops the heating means 2 when the amount is measured and considered as boiling, waits for a first predetermined time to elapse when the boiling detecting means 7 detects boiling, and then waits for a second predetermined time. Driving the heat retaining means 3,
The temperature detecting means 4 when the heat retaining means 3 is stopped
Temperature setting means for determining the heat retention temperature to a value obtained by subtracting a preset value from the value of the water amount detection means 10 from the value of the water amount detection means 10, 9 is a temperature determined by the temperature setting means 8 and 9 This is control means for controlling the heat retaining means 3 so as to reach a temperature determined by comparing the outputs.
【００２１】また11は、前記温度設定手段８が設定した
保温温度が所定の温度よりも低ければ前記温度設定手段
８の値を所定温度に変更する変更手段、また12は、前記
比較手段９が前記保温手段３を駆動しているときは時間
を計時し、停止しているときは計時時間をクリアし続け
る計時手段、13は前記計時手段が所定の時間を計時する
とその時の設定温度を所定値だけ下げた値に変更する制
御手段である。Further, 11 is changing means for changing the value of the temperature setting means 8 to a predetermined temperature if the heat retention temperature set by the temperature setting means 8 is lower than a predetermined temperature. When the heat retaining means 3 is driven, the time is measured, and when it is stopped, the time keeping means keeps clearing the time. When the time keeping means measures a predetermined time, the set temperature at that time is a predetermined value. This is control means for changing the value to a value that has been lowered by just one.
【００２２】図２は本発明の一実施例を示す電気湯沸か
し器の回路図である。図において、14は交流電源であ
る。前記加熱手段２は、容器内の液体を加熱する第１の
発熱体、前記保温手段３は前記加熱手段２よりも加熱電
力が小さく容器内の液体を加熱保温する第２の発熱体で
構成される。前記通電手段５は前記加熱手段２と前記保
温手段３のそれぞれの発熱体と交流電源10と直列に接続
されたリレ−接点5a，5bと、このリレ−接点5a，5bの制
御を行なうリレ−コイル5c，5dで構成され、このリレー
コイルに電流を流し、前記リレ−接点を閉じるようにな
っている。FIG. 2 is a circuit diagram of an electric water heater showing one embodiment of the present invention. In the figure, reference numeral 14 denotes an AC power supply. The heating means 2 is constituted by a first heating element for heating the liquid in the container, and the heat retaining means 3 is constituted by a second heating element having a smaller heating power than the heating means 2 for heating and retaining the liquid in the container. You. The energizing means 5 has relay contacts 5a and 5b connected in series with the heating elements of the heating means 2 and the heat retaining means 3 and an AC power supply 10, and a relay for controlling the relay contacts 5a and 5b. It is composed of coils 5c and 5d, and a current flows through this relay coil to close the relay contact.
【００２３】前記温度検知手段４で、温度を抵抗値に変
換する感温素子4aと、この感温素子4aと抵抗4bとで分圧
電圧値をつくりこれを２進符号に変換するAD変換器4c及
びコンパレータ4dに入力される。コンパレータ4dの出力
は感温素子4aが所定の温度を境界に出力が反転するよう
に構成されている。またAD変換器4cは約70〜120 ℃の範
囲を0.5 ℃刻みで検出できるように構成され温度勾配等
の検出を可能にし、これによって本実施例では0.5℃/25
秒を第１の所定値としこれより温度上昇勾配が小さくな
ると沸騰と判定する。A temperature sensing element 4a for converting a temperature into a resistance value by the temperature detecting means 4, and an AD converter for forming a divided voltage value by the temperature sensing element 4a and the resistance 4b and converting the divided voltage value into a binary code. 4c and the comparator 4d. The output of the comparator 4d is configured so that the output of the temperature sensing element 4a is inverted at a predetermined temperature as a boundary. The AD converter 4c is configured to be able to detect a range of about 70 to 120 ° C. in steps of 0.5 ° C., thereby enabling detection of a temperature gradient or the like.
The second is set to a first predetermined value, and when the temperature rise gradient becomes smaller than this, it is determined that boiling has occurred.
【００２４】前記水量検知手段10は、容器の上部と下部
を接続した水位管を等分した位置に取り付けられた電極
10a,10b,10c （本実施例では３等分）で構成され、水が
取り付けられた電極位置に到達するとその電極は通電さ
れて”Ｈ”を前記温度設定手段８に出力する。前記温度
設定手段８はその信号がどの電極によって出力されたも
のかを判断することで水位を検出することができる。The water amount detecting means 10 includes an electrode mounted at an equally divided position of a water level tube connecting the upper and lower parts of the container.
10a, 10b, and 10c (in this embodiment, three equal parts). When the electrode reaches the position of the electrode to which water is attached, the electrode is energized and outputs "H" to the temperature setting means 8. The temperature setting means 8 can detect the water level by determining which electrode has output the signal.
【００２５】15はマイクロコンピュータ（以後マイコン
と略する）でプログラムを実行することで前記加熱開始
手段６、前記沸騰検出手段７、前記温度設定手段８、前
記比較手段９、前記変更手段11、前記計時手段12及び前
記制御手段13の制御方法を実現している。Reference numeral 15 denotes a microcomputer (hereinafter abbreviated as "microcomputer") that executes a program to execute the heating starting means 6, the boiling detecting means 7, the temperature setting means 8, the comparing means 9, the changing means 11, The control method of the timer 12 and the controller 13 is realized.
【００２６】図３は本第１の発明における前記マイクロ
コンピュ−タ15に記憶されたプログラムのフロ−チャ−
トを示したもので、これによって動作を説明する。FIG. 3 is a flowchart of a program stored in the microcomputer 15 according to the first embodiment.
The operation will be described with reference to FIG.
【００２７】本実施例では、電源投入されると前記した
温度上昇勾配で沸騰を検出するまで前記加熱手段２を駆
動する（ステップ21、22）。沸騰を検出すると前記加熱
手段２を停止し、第１の所定時間（本実施例では５分
間）経過するのを待つ（ステップ22、23、24）。第１の
所定時間が経過すると、前記保温手段３を第２の所定時
間（本実施例では３分間）駆動する（ステップ25、2
6）。そして第２の所定時間が経過すると、その時の前
記温度検知手段４の値を入力し、これに予め設定された
値を差し引いた値を保温温度と設定する（ステップ2
7）。保温温度が設定されると以後は設定された値より
前記温度検知手段４の値が高ければ前記保温手段３は停
止し前記温度検知手段４の値が低ければ前記保温手段３
を駆動する（ステップ28−30）。In this embodiment, when the power is turned on, the heating means 2 is driven until boiling is detected with the above-mentioned temperature rise gradient (steps 21 and 22). When the boiling is detected, the heating means 2 is stopped, and a first predetermined time (5 minutes in this embodiment) elapses (steps 22, 23, 24). After the first predetermined time has elapsed, the heat retaining means 3 is driven for a second predetermined time (3 minutes in this embodiment) (steps 25 and 2).
6). Then, when the second predetermined time has elapsed, the value of the temperature detecting means 4 at that time is input, and a value obtained by subtracting a preset value from the value is set as the heat retention temperature (step 2).
7). After the temperature is set, if the value of the temperature detecting means 4 is higher than the set value, the temperature keeping means 3 is stopped, and if the value of the temperature detecting means 4 is low, the temperature keeping means 3 is set.
Is driven (steps 28-30).
【００２８】このように本発明は簡単な構成で保温温度
を高く維持することができる。図４は本第２の発明にお
ける前記マイクロコンピュ−タ15に記憶されたプログラ
ムのフロ−チャ−トを示したもので、これによって動作
を説明する。As described above, the present invention can maintain a high heat retaining temperature with a simple structure. FIG. 4 shows a flowchart of a program stored in the microcomputer 15 according to the second invention, and the operation will be described with reference to FIG.
【００２９】本実施例では、電源投入されると前記した
温度上昇勾配で沸騰を検出するまで前記加熱手段２を駆
動する（ステップ31、32）。沸騰を検出すると前記加熱
手段２を停止し、前記水量検知手段10の値を入力し、第
１の所定時間（本実施例では５分間）経過するのを待つ
（ステップ33、34、35）。第１の所定時間が経過する
と、前記保温手段３を第２の所定時間（本実施例では１
分間）駆動する（ステップ37）。そして第２の所定時間
が経過すると、その時の前記温度検知手段４の値を入力
し、これに検知した水量に応じて予め設定された値を差
し引いた値を保温温度と設定する（ステップ38）。保温
温度が設定されると以後は設定された値より前記温度検
知手段４の値が高ければ前記保温手段３は停止し前記温
度検知手段４の値が低ければ前記保温手段３を駆動する
（ステップ39−41）。In this embodiment, when the power is turned on, the heating means 2 is driven until boiling is detected with the above-mentioned temperature rise gradient (steps 31 and 32). When the boiling is detected, the heating means 2 is stopped, the value of the water amount detecting means 10 is inputted, and the elapse of a first predetermined time (5 minutes in this embodiment) is waited (steps 33, 34, 35). After the first predetermined time has elapsed, the heat retaining means 3 is turned on for a second predetermined time (in this embodiment, 1 second).
Min) (step 37). Then, when the second predetermined time has elapsed, the value of the temperature detecting means 4 at that time is input, and a value obtained by subtracting a preset value according to the detected water amount is set as the heat retaining temperature (step 38). . After the temperature is set, if the value of the temperature detecting means 4 is higher than the set value, the temperature keeping means 3 is stopped, and if the value of the temperature detecting means 4 is low, the temperature keeping means 3 is driven (step 39-41).
【００３０】このように本発明は水量によってさらに設
定値を細かくすることで沸騰検知から短時間で安定した
高い温度で保温温度を維持することができる。As described above, according to the present invention, by further reducing the set value according to the amount of water, it is possible to maintain the heat retention temperature at a stable high temperature in a short time from the detection of boiling.
【００３１】図５は本第３の発明における前記マイクロ
コンピュ−タ15に記憶されたプログラムのフロ−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 is a flowchart of a program stored in the microcomputer 15 according to the third embodiment.
The operation will be described with reference to FIG.
【００３２】本実施例では第２の所定時間後の温度と水
量によって保温温度を設定するまでは前記第１の実施例
と同様の構成であるが、保温温度が設定されるとその値
が所定温度（本実施例では約92℃）よりも低く設定され
たときにはこの所定温度を保温温度として設定するよう
にしたものである（ステップ59、60）。そして以後設定
された値より前記温度検知手段４の値が高ければ前記保
温手段３は停止し前記温度検知手段４の値が低ければ前
記保温手段３を駆動する（ステップ61−63）。In this embodiment, the configuration is the same as that of the first embodiment until the heat retention temperature is set based on the temperature and the amount of water after the second predetermined time, but when the heat retention temperature is set, the value becomes the predetermined value. When the temperature is set lower than the temperature (about 92 ° C. in this embodiment), the predetermined temperature is set as the heat retention temperature (steps 59 and 60). If the value of the temperature detecting means 4 is higher than the set value thereafter, the heat retaining means 3 is stopped, and if the value of the temperature detecting means 4 is low, the heat retaining means 3 is driven (steps 61-63).
【００３３】このように本発明では簡単な構成で保温温
度を所定温度以上の高い温度に設定することができる。As described above, according to the present invention, the heat retention temperature can be set to a higher temperature than the predetermined temperature with a simple configuration.
【００３４】図６は本第４の発明における前記マイクロ
コンピュ−タ15に記憶されたプログラムのフロ−チャ−
トを示したもので、これによって動作を説明する。FIG. 6 is a flowchart of a program stored in the microcomputer 15 according to the fourth invention.
The operation will be described with reference to FIG.
【００３５】本実施例では、保温温度を設定しその温度
を維持するために前記保温手段３をオンオフさせるまで
は前記第１及び第２の実施例と同様の構成であるが、こ
の前記保温手段３を駆動する間は前記計時手段12は時間
の計時を行い（ステップ82）、前記保温手段３が停止し
ている間は前記計時手段12をクリアし続け（ステップ8
3）、前記計時手段12が第３の所定時間（本実施例では
１時間）を経過すると設定された保温温度の値を前記所
定温度に下げてやるようにする（ステップ84）。In this embodiment, the structure is the same as that of the first and second embodiments until the heat retaining temperature is set and the heat retaining means 3 is turned on and off in order to maintain the temperature. 3 is driven, the timer 12 measures time (step 82), and while the heat retaining means 3 is stopped, the timer 12 is kept cleared (step 8).
3) After the third predetermined time (one hour in this embodiment) has elapsed, the timer 12 lowers the set value of the heat retention temperature to the predetermined temperature (step 84).
【００３６】このようにして前記計時手段12が第３の所
定時間計時すると設定温度を下げることで連続沸騰しな
い高い温度を維持することができる。As described above, when the time measuring means 12 times the third predetermined time, the set temperature is lowered to maintain a high temperature at which continuous boiling does not occur.
【００３７】[0037]
【発明の効果】上記実施例から明らかのように本第１の
発明によれば、沸騰検出後に保温手段を制御しながらあ
る程度時間が経過して温度検知手段が水温に近ずいて安
定したときの値で保温温度を設定するので、簡単な方法
で連続沸騰のお恐れのない沸点に近い温度で保温するこ
とができ、熱い湯がすぐに使用でき、使い勝手の良い電
気湯沸かし器を提供することができる。As is apparent from the above embodiment, according to the first aspect of the present invention, when the temperature detecting means approaches the water temperature and stabilizes after a certain period of time has passed while controlling the heat retaining means after the detection of boiling. Since the heat retention temperature is set by the value, the temperature can be kept at a temperature close to the boiling point where there is no danger of continuous boiling by a simple method, hot water can be used immediately, and an easy-to-use electric water heater can be provided. .
【００３８】さらに第２の発明によれば、保温手段を制
御しながら水温は沸点を維持しかつ温度検知手段を水温
に近づけようとする第２の所定時間を短くすることがで
き、よって蒸気が断続的にでている時間も短くすること
ができ、より安全で使い勝手の良いものを提供すること
ができる。Further, according to the second aspect of the present invention, the second predetermined time during which the water temperature maintains the boiling point and the temperature detecting means approaches the water temperature can be shortened while controlling the heat retaining means. Intermittent time can be shortened, and a safer and more convenient one can be provided.
【００３９】また第３の発明によれば加熱途中などに水
量を変化された場合などで通常の沸騰検出時の温度検知
手段の特性が得られずに設定した保温温度が低くなった
場合でも従来維持していた保温温度よりは下げないよう
にすることができる。According to the third aspect of the present invention, even when the amount of water is changed during heating or the like, the characteristics of the temperature detecting means at the time of normal boiling detection cannot be obtained and the set heat retaining temperature becomes low. It is possible to prevent the temperature from lowering than the maintained temperature.
【００４０】また第４の発明によれば加熱途中などに水
量を変化された場合などで通常の沸騰検出時の温度検知
手段の特性が得られずに設定した保温温度が高くなって
しまい連続沸騰にいたる場合にもある時間それが続くと
連続沸騰しない従来の温度を維持しようとするので、よ
り使い勝手のよいものを提供することができる。According to the fourth aspect, when the amount of water is changed during heating or the like, the characteristics of the temperature detecting means at the time of normal boiling detection cannot be obtained, and the set heat retention temperature becomes high, resulting in continuous boiling. In this case, the conventional temperature that does not continuously boil after a certain period of time is maintained, so that a more convenient product can be provided.
【図１】本発明の一実施例における電気湯沸かし器の具
体的なブロック図FIG. 1 is a specific block diagram of an electric water heater in one embodiment of the present invention.
【図２】同電気湯沸かし器の具体的な回路図FIG. 2 is a specific circuit diagram of the electric water heater.
【図３】同電気湯沸かし器の第１の発明における処理を
示すフロ−チャ−トFIG. 3 is a flowchart showing processing of the electric water heater in the first invention.
【図４】同電気湯沸かし器の第２の発明における処理を
示すフロ−チャ−トFIG. 4 is a flowchart showing the processing of the electric water heater in the second invention.
【図５】同電気湯沸かし器の第３の発明における処理を
示すフロ−チャ−トFIG. 5 is a flowchart showing processing of the electric water heater in the third invention.
【図６】同電気湯沸かし器の第４の発明における処理を
示すフロ−チャ−トFIG. 6 is a flowchart showing processing of the electric water heater in the fourth invention.
【図７】同電気湯沸かし器の加熱中の温度特性FIG. 7 shows a temperature characteristic during heating of the electric water heater.
２ 加熱手段 ３ 保温手段 ４ 温度検知手段 ５ 通電手段 ６ 加熱開始手段 ７ 沸騰検出手段 ８ 温度設定手段 ９ 比較手段 10 水量検知手段 11 変更手段 12 計時手段 13 制御手段 2 heating means 3 warming means 4 temperature detecting means 5 energizing means 6 heating start means 7 boiling detecting means 8 temperature setting means 9 comparing means 10 water amount detecting means 11 changing means 12 timing means 13 control means
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−17813（ＪＰ，Ａ) 特開 昭64−68213（ＪＰ，Ａ) 特開 平４−17814（ＪＰ，Ａ) 特開 平４−35621（ＪＰ，Ａ) 特開 昭63−315009（ＪＰ，Ａ) 特開 平６−154088（ＪＰ，Ａ) 特開 平７−177970（ＪＰ，Ａ) 実開 平２−109527（ＪＰ，Ｕ) 実開 昭64−1624（ＪＰ，Ｕ) 実開 昭64−1625（ＪＰ，Ｕ) 実開 平５−95424（ＪＰ，Ｕ) 実開 平６−52725（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) A47J 27/21 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-17813 (JP, A) JP-A-64-68213 (JP, A) JP-A-4-17814 (JP, A) JP-A-4-17813 35621 (JP, A) JP-A-63-315009 (JP, A) JP-A-6-155408 (JP, A) JP-A-7-177970 (JP, A) JP-A-2-109527 (JP, U) Japanese Utility Model Showa 16-1624 (JP, U) Japanese Utility Model Showa 16-1625 (JP, U) Japanese Utility Model Hei 5-95424 (JP, U) Japanese Utility Model Utility Model 6-52725 (JP, U) (58) (Int.Cl. 7 , DB name) A47J 27/21
Claims (4)
体を加熱する加熱手段と、前記容器内の液体を加熱保温
する保温手段と、前記加熱手段及び前記保温手段の通電
を制御する通電手段と、前記容器内の液体温度を検知す
る温度検知手段と、電源が投入されると前記加熱手段を
駆動する加熱開始手段と、前記温度検知手段が検出した
温度上昇勾配が所定値以下になると前記加熱手段を停止
させる沸騰検出手段と、前記沸騰検知手段の検知結果に
応じて前記加熱手段が停止して以降第１の所定時間経過
してから第２の所定時間経過するまで前記保温手段を駆
動し第２の所定時間経過時の前記温度検知手段の検知温
度から予め設定された設定値を差し引いて保温温度を決
定する温度設定手段と、前記設定された保温温度より前
記温度検知手段の出力が低い間前記保温手段を駆動する
比較手段を備えた電気湯沸かし器。1. A container for accommodating a liquid, a heating unit for heating the liquid in the container, a heat retaining unit for heating and retaining the liquid in the container, and a power supply for controlling the energization of the heating unit and the heat retaining unit. Means, a temperature detecting means for detecting the temperature of the liquid in the container, a heating start means for driving the heating means when the power is turned on, and a temperature rising gradient detected by the temperature detecting means falling below a predetermined value. Boiling detection means for stopping the heating means, and the heat retention means until a second predetermined time elapses after a first predetermined time has elapsed since the heating means was stopped according to a detection result of the boiling detection means. A temperature setting means for determining a heat retention temperature by subtracting a preset set value from a temperature detected by the temperature detection means when the second predetermined time has elapsed, and an output of the temperature detection means from the set heat retention temperature. An electric kettle comprising comparison means for driving said heat retaining means while power is low.
て前記設定値の値を決定する水量検知手段を備えた請求
項１記載の電気湯沸かし器。2. The electric water heater according to claim 1, further comprising a water amount detecting means for detecting the amount of liquid in the container and determining the set value according to the amount of water.
連続沸騰しない高い温度である所定温度を比較し前記設
定した保温温度の方が低ければ前記所定温度を保温温度
に変更する変更手段を設けた請求項１または請求項２記
載の電気湯沸かし器。3. A heat retaining temperature set by said temperature setting means.
3. The electric water heater according to claim 1, further comprising a change unit configured to compare a predetermined temperature which is a high temperature that does not continuously boil, and to change the predetermined temperature to the heat retention temperature if the set heat retention temperature is lower.
動している時間を計時する計時手段と、前記計時手段に
よる計時時間が第３の所定時間経過すると連続沸騰しな
い高い温度である所定温度を保温温度に変更する制御手
段を備えた請求項１ないし３のいずれか１項に記載の電
気湯沸かし器。4. A timer means for counting the time during which the comparing means continuously drives the heat retaining means, and the boiling means does not continuously boil when a third predetermined time has elapsed.
The electric water heater according to any one of claims 1 to 3 , further comprising control means for changing a predetermined high temperature to a heat retaining temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32910593A JP3227962B2 (en) | 1993-12-24 | 1993-12-24 | Electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32910593A JP3227962B2 (en) | 1993-12-24 | 1993-12-24 | Electric water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07177971A JPH07177971A (en) | 1995-07-18 |
| JP3227962B2 true JP3227962B2 (en) | 2001-11-12 |
Family
ID=18217672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32910593A Expired - Fee Related JP3227962B2 (en) | 1993-12-24 | 1993-12-24 | Electric water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3227962B2 (en) |
-
1993
- 1993-12-24 JP JP32910593A patent/JP3227962B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07177971A (en) | 1995-07-18 |
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