JP2604214B2 - Electric water heater - Google Patents
Electric water heaterInfo
- Publication number
- JP2604214B2 JP2604214B2 JP28363088A JP28363088A JP2604214B2 JP 2604214 B2 JP2604214 B2 JP 2604214B2 JP 28363088 A JP28363088 A JP 28363088A JP 28363088 A JP28363088 A JP 28363088A JP 2604214 B2 JP2604214 B2 JP 2604214B2
- Authority
- JP
- Japan
- Prior art keywords
- heater
- temperature
- value
- detection value
- electric water
- 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 - Lifetime
Links
Landscapes
- Heat-Pump Type And Storage Water Heaters (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、電気温水器に於ける、空だき防止機能に関
する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an emptying prevention function in an electric water heater.
従来の装置は、JIS Ｃ 9219「貯湯式電気温水器」
に記載するように、空だき防止の手段としては、水がタ
ンク内に給水されていない場合は、ヒータへの通電を停
止する構造か又は、加熱防止器が一定温度になるとヒー
タへの通電を停止する構造となっていた。The conventional equipment is JIS C 9219 “Hot water storage type electric water heater”
As described in (1), as a means for preventing emptying, when water is not supplied into the tank, the heater is de-energized, or the heater is de-energized when the heater reaches a certain temperature. It was structured to stop.
上記従来技術の前者は、タンク内への給水の有無を検
出するセンサが必要であり、構造が複雑となる欠点があ
った。後者は、構造は簡単であるが、加熱防止器の作動
値を、通常の使用時には作動しないように、高く設定し
ておく必要がある。このため、空だき時に於ける安全性
は確保できるものの、ヒータは焼損し、再使用できなく
なるという欠点があった。The former of the prior art requires a sensor for detecting the presence or absence of water supply into the tank, and has a drawback that the structure is complicated. The latter has a simple structure, but requires that the operating value of the heat protector be set high so that it does not operate during normal use. For this reason, although the safety at the time of emptying can be ensured, there is a disadvantage that the heater is burned out and cannot be reused.
本発明の目的は、簡単な構造で、かつ、安全で再使用
も可能な、空だき防止構造を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an emptying prevention structure which has a simple structure and is safe and reusable.
上記目的は、温度上昇時の時間的温度勾配を検出する
ことにより、達成される。The above object is achieved by detecting a temporal temperature gradient when a temperature rises.
すなわち、通常状態では、タンク内は満水状態であ
り、ヒータの周囲は水に接している。ヒータの発生する
熱は、効率よく水へ伝わるよう設計されているため、ヒ
ータ自身の温度上昇は、安全範囲内であり、ヒータ取付
部近傍の熱伝導もわずかである。ところが、空だき時に
於いては、ヒータの周囲は、水より熱伝導率の小さい空
気に接しているため、ヒータの発する熱は空気へうまく
伝わらず、ヒータ自身の急激な温度上昇をひき起こす。
これに伴ない、ヒータ取付近傍への熱伝導は大きくな
る。That is, in the normal state, the inside of the tank is full, and the periphery of the heater is in contact with water. Since the heat generated by the heater is designed to be efficiently transmitted to water, the temperature rise of the heater itself is within a safe range, and the heat conduction near the heater mounting portion is also small. However, at the time of emptying, since the surroundings of the heater are in contact with air having a lower thermal conductivity than water, the heat generated by the heater is not well transmitted to the air, causing a rapid rise in temperature of the heater itself.
Accordingly, heat conduction to the vicinity of the heater is increased.
従って、特にヒータ取付部近傍に於いては、通常時と
空だき時の単位時間当りの温度上昇値の差が顕著であ
り、この差を検出することにより、空だき防止が可能で
ある。Therefore, especially in the vicinity of the heater mounting portion, the difference between the temperature rise values per unit time during normal operation and during emptying is remarkable, and by detecting this difference, emptying can be prevented.
これに基づき、本発明の電気温水器は、ヒータ取付部
近傍にタンク内の水温を検出する温度センサを取付け、
該温度センサの検出値を、一定時間後の再検出値と比較
し、その差が、予め定めた一底値より大きい場合は、ヒ
ータへの通電を停止するように構成したことを特徴とす
る。Based on this, the electric water heater of the present invention has a temperature sensor for detecting the water temperature in the tank near the heater mounting portion,
The detection value of the temperature sensor is compared with a re-detection value after a certain period of time, and if the difference is larger than a predetermined bottom value, the power supply to the heater is stopped.
この場合において、ヒータ通電中は、一定サイクル毎
に温度検出を繰返し、前回の検出値と今回の検出値を常
に比較するように構成することができる。In this case, while the heater is energized, the temperature detection may be repeated at regular intervals, and the previous detection value and the current detection value may be constantly compared.
さらに、前回の検出値と今回の検出値とを比較し、そ
の差が、予め定めた一定値より小さい場合は、異常信号
を発するように構成することができる。Further, it is possible to compare the previous detection value with the current detection value, and if the difference is smaller than a predetermined value, generate an abnormal signal.
ヒータ取付部近傍に取付けたタンク内の水温を検出す
る温度センサの検出値を、一定時間後の再検出値と比較
し、その差が、予め定めた一定値より大きい場合には、
ヒータへの通電は停止される。The detection value of the temperature sensor for detecting the temperature of the water in the tank attached near the heater attachment portion is compared with the re-detection value after a certain period of time, and if the difference is larger than a predetermined value,
Power supply to the heater is stopped.
以下、本発明の一実施例を第１図により説明する。 Hereinafter, an embodiment of the present invention will be described with reference to FIG.
１はタンクであり、下部に給水口２、上部に出湯口３
を有する。４はヒータであり、ヒータフランジ５を介し
て、タンク１に固定してある。６はヒータフランジ５に
取付けた温度センサである。７は制御装置であり、温度
センサ６にて温度を検出し、ヒータ４のON,OFFを制御す
る。1 is a tank, a water supply port 2 at the bottom, and a tap 3 at the top.
Having. Reference numeral 4 denotes a heater which is fixed to the tank 1 via a heater flange 5. Reference numeral 6 denotes a temperature sensor attached to the heater flange 5. Reference numeral 7 denotes a control device, which detects the temperature by the temperature sensor 6 and controls ON / OFF of the heater 4.
第２図は、制御装置内部の制御シーケンスの一部であ
る。第３図は、ヒータフランジ部の温度の時間的変化を
表わしており、実線は通常時、破線は空だき時を示す。FIG. 2 shows a part of a control sequence inside the control device. FIG. 3 shows a temporal change in the temperature of the heater flange portion. A solid line indicates a normal time, and a broken line indicates a blank time.
かかる構成に於いて、制御装置７はヒータフランジ５
の温度t1を検出、記憶した後、一定時間後再度ヒータフ
ランジの温度t2を検出する。In such a configuration, the control device 7 controls the heater flange 5
Detecting the temperature t 1 of, after storing, for detecting the temperature t 2 again heater flange after a certain time.
そして、t2−t1≧Ｅが成立する場合はヒータ４への通
電を停止するようプログラムされている。なお、Ｅは、
通常時と空だき時のヒータフランジ５の一定時間の温度
である。（t2−t1）および（t2′−t1′）の間の値を持
つよう予め定めた数値である。If t 2 −t 1 ≧ E holds, the program is programmed to stop energizing the heater 4. E is
This is the temperature of the heater flange 5 during a normal time and when the heater flange 5 is empty. It is a numerical value that is predetermined to have a value between (t 2 −t 1 ) and (t 2 ′ −t 1 ′).
本実施例によれば、過熱防止器の作動を持つことな
く、空だきが検出可能であり、ヒータ４の焼損以前に安
全に停止することが可能である。又、タンク内への給水
の有無を検出する特殊なセンサは必要なく、温度センサ
で構成できるため、構造が簡単であり、安価に製造でき
る効果がある。According to this embodiment, emptying can be detected without having to operate the overheat protector, and it is possible to safely stop the heater 4 before the burnout of the heater 4. Further, since a special sensor for detecting the presence or absence of water supply into the tank is not required and can be constituted by a temperature sensor, there is an effect that the structure is simple and the manufacturing can be performed at low cost.
上記のプログラムは、第４図に示すように、ヒータ４
の通電中は一定時間のサイクルで繰返し、前回の検出値
と今回の検出値の差を使用してもよい。又、同一サイク
ル内にて、沸き上げ設定値と検出温度を比較することに
より、空だき検出の精度を向上させるばかりでなく、温
度センサ６に温度調節器の機能も合わせ持たすことがで
きる。The above program, as shown in FIG.
May be repeated in a cycle of a fixed time, and the difference between the previous detection value and the current detection value may be used. Further, by comparing the boiling set value and the detected temperature within the same cycle, not only the accuracy of emptying detection can be improved, but also the temperature sensor 6 can have a function of a temperature controller.
さらに、一定時間後の温度との温度差を、通常起りう
る最低値と比較することにより、ヒータ４の断線が検出
でき、より質の高い制御が可能となる。Furthermore, by comparing the temperature difference with the temperature after a certain time with the lowest value that can occur normally, disconnection of the heater 4 can be detected, and higher quality control can be performed.
本発明によれば、電気温水器のヒータ取付部近傍にタ
ンク内の水温を検出する温度センサを取付け、温度セン
サ検出値を、一定時間後の再検出値と比較し、その差
が、予め定めた一定値より大きい場合は、ヒータへの通
電を停止するように構成したことにより、特殊な給水の
有無や特殊な箇所の温度を検出するセンサを必要とする
ことなく、安全で確実な空だき防止機能を、簡単な構成
で安価に得ることができ、また、温度センサの検出値
を、温度調節器に併用できる効果がある。According to the present invention, a temperature sensor for detecting the water temperature in the tank is mounted near the heater mounting portion of the electric water heater, and the temperature sensor detection value is compared with a re-detection value after a predetermined time, and the difference is determined in advance. When it is larger than a certain value, the power supply to the heater is stopped so that there is no need for a sensor to detect the presence or absence of special water supply or the temperature of a special place, so that safe and reliable emptying is possible. The prevention function can be obtained at a low cost with a simple configuration, and the detection value of the temperature sensor can be used together with the temperature controller.
第１図は、本発明の一実施例の構造図、第２図・第４図
はその制御シーケンス図、第３図はヒータフランジ部に
おける温度の時間的変化を示した図である。 １……タンク、４……ヒータ、５……ヒータフランジ、
６……温度センサ。FIG. 1 is a structural diagram of one embodiment of the present invention, FIGS. 2 and 4 are control sequence diagrams thereof, and FIG. 3 is a diagram showing a temporal change in temperature at a heater flange portion. 1 ... tank, 4 ... heater, 5 ... heater flange,
6. Temperature sensor.
Claims (3)
する温度センサを取付け、該温度センサの検出値を、一
定時間後の再検出値と比較し、その差が、予め定めた一
底値より大きい場合は、ヒータへの通電を停止するよう
に構成したことを特徴とする電気温水器。1. A temperature sensor for detecting a water temperature in a tank is mounted near a heater mounting portion, and a detected value of the temperature sensor is compared with a re-detected value after a predetermined time, and a difference between the detected value and a predetermined bottom value is determined. An electric water heater characterized in that when it is larger, the power supply to the heater is stopped.
出を繰返し、前回の検出値と今回の検出値を常に比較す
るように構成したことを特徴とする請求項１記載の電気
温水器。2. The electric water heater according to claim 1, wherein the temperature detection is repeated at regular intervals while the heater is energized, and the previous detection value and the current detection value are always compared.
その差が、予め定めた一定値より小さい場合は、異常信
号を発するように構成したことを特徴とする請求項２記
載の電気温水器。3. A comparison between a previous detection value and a current detection value,
3. The electric water heater according to claim 2, wherein an abnormality signal is issued when the difference is smaller than a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28363088A JP2604214B2 (en) | 1988-11-11 | 1988-11-11 | Electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28363088A JP2604214B2 (en) | 1988-11-11 | 1988-11-11 | Electric water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02130343A JPH02130343A (en) | 1990-05-18 |
| JP2604214B2 true JP2604214B2 (en) | 1997-04-30 |
Family
ID=17668003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28363088A Expired - Lifetime JP2604214B2 (en) | 1988-11-11 | 1988-11-11 | Electric water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2604214B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017009184A (en) * | 2015-06-22 | 2017-01-12 | 株式会社Ｌｉｘｉｌ | Electric water heater |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2876827B2 (en) * | 1991-07-18 | 1999-03-31 | 松下電器産業株式会社 | Electric water heater |
| JP5257834B2 (en) * | 2008-03-27 | 2013-08-07 | Ｔｏｔｏ株式会社 | Hot water storage type electric water heater |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02115655A (en) * | 1988-10-26 | 1990-04-27 | Matsushita Electric Ind Co Ltd | Electric hot water device |
-
1988
- 1988-11-11 JP JP28363088A patent/JP2604214B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017009184A (en) * | 2015-06-22 | 2017-01-12 | 株式会社Ｌｉｘｉｌ | Electric water heater |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02130343A (en) | 1990-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2604214B2 (en) | Electric water heater | |
| JPS6110315Y2 (en) | ||
| JPH04203752A (en) | Dry burning preventing device | |
| JP2517549Y2 (en) | Hot water tank | |
| JP2673997B2 (en) | Boiler water level control device | |
| JPH03291873A (en) | Warming device | |
| JPH064169Y2 (en) | Water supply control device such as boiler | |
| JPS6053830B2 (en) | solar water heater | |
| JP6704660B2 (en) | Injection molding machine that automatically switches between manned and unmanned operation modes | |
| JP3975304B2 (en) | Electric water heater air blow prevention device | |
| JPH10220706A (en) | Water level abnormality detector for steam generator | |
| JP2559116B2 (en) | Gasification oil burner | |
| JP3128388B2 (en) | Electric water heater | |
| JP2573988Y2 (en) | Discharge circuit overheat protection device | |
| JP2001343161A (en) | Hot water storage type electric water heater | |
| JPH0634126A (en) | Alarm device for hot air heater | |
| JP3010498B2 (en) | Overheating prevention device for fixing device | |
| JPH02115655A (en) | Electric hot water device | |
| KR970032587A (en) | Abnormal process control device and method for electric rice cooker | |
| JP2876827B2 (en) | Electric water heater | |
| JP2557394Y2 (en) | Electric heating unit | |
| JP2005326037A (en) | Planar heating device | |
| JPH07158970A (en) | Malfunction deciding device for circulating pump of heating medium boiler | |
| JP2006294333A (en) | Empty heating prevention equipment of electric heater | |
| JPH04129030U (en) | air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080129 Year of fee payment: 11 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080129 Year of fee payment: 11 |
|
| R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080129 Year of fee payment: 11 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080129 Year of fee payment: 11 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090129 Year of fee payment: 12 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090129 Year of fee payment: 12 |