JPH1026345A - Hot-water supplier - Google Patents

Hot-water supplier

Info

Publication number
JPH1026345A
JPH1026345A JP20329296A JP20329296A JPH1026345A JP H1026345 A JPH1026345 A JP H1026345A JP 20329296 A JP20329296 A JP 20329296A JP 20329296 A JP20329296 A JP 20329296A JP H1026345 A JPH1026345 A JP H1026345A
Authority
JP
Japan
Prior art keywords
freezing
overheating
combustion
combustion chamber
burner
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
Application number
JP20329296A
Other languages
Japanese (ja)
Other versions
JP3472414B2 (en
Inventor
Yutaka Aoki
豊 青木
Koichi Koto
公一 光藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Paloma Kogyo KK
Original Assignee
Paloma Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Paloma Kogyo KK filed Critical Paloma Kogyo KK
Priority to JP20329296A priority Critical patent/JP3472414B2/en
Publication of JPH1026345A publication Critical patent/JPH1026345A/en
Application granted granted Critical
Publication of JP3472414B2 publication Critical patent/JP3472414B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Regulation And Control Of Combustion (AREA)
  • Control Of Combustion (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent overheating or freezing of a hot water supplier with an inexpensive constitution by a method wherein the overheating of a combustion chamber is detected based on the value of resistance, which is detected by energizing a conductive body, while the amount of supplying electric power to the conductive body is increased when there is the possibility of freezing during stopping combustion. SOLUTION: An overheating and freezing preventing device 40 is obtained by a method wherein one series of a meandering linear conductive pattern is printed uniformly on the whole area of an insulating sheet made of a resin by carbon ink or the mixture of conductive carbon and the resin while the overheating and freezing preventing device 40 is inserted and installed between a combustion chamber 12 as well as a heat exchanger 13 and an outer cylindrical casing 11 to connect the device 40 to a controller 20 through a lead wire 43. During the combustion of a burner 14, the abnormal overheating of the combustion chamber 12 is detected based on the change of an electric resistance, detected by energizing the carbon ink, to stop the combustion of the burner 14 while the device 40 is utilized as a freezing preventing heater when there is the possibility of freezing during stopping the combustion of the burner 14. In this case, the amount of conducting current is increased to generate heat and accordingly, the freezing of a water supplying passage and a hot-water supplying passage is prevented by heating.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は過熱防止装置と凍結
防止装置とを備えた給湯器に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater provided with a device for preventing overheating and a device for preventing freezing.

【0002】[0002]

【従来の技術】従来より、給湯器には安全に使用できる
ための種々の安全装置が備えられている。その一例とし
て、熱交換器の詰まりやオーバーインプットにより燃焼
室が異常過熱してひび割れや穴あきを生じ、そこから高
温の排ガスが漏れて外胴ケーシングを焼損し火災の原因
となることを防止するための過熱防止装置がある。過熱
防止装置は、リード線で接続された複数の温度ヒューズ
を取付けた過熱検出板を燃焼室の背面と外胴ケーシング
との間に設けると共に、その温度ヒューズを燃焼制御回
路に接続し、燃焼室に生じた穴あきから漏れた高温の排
ガスが温度ヒューズを溶融するとガスの供給が直ちに停
止されるようにするものである。また、冬場に給水,給
湯パイプが凍結することに起因して損傷することを回避
するため、サーマルスイッチにより作動するヒータを数
ヵ所に設け、凍結の恐れがある場合には給水,給湯パイ
プを加熱することにより凍結防止を図るといった凍結防
止装置も備えている。
2. Description of the Related Art Conventionally, water heaters have been provided with various safety devices for safe use. As an example, to prevent the combustion chamber from overheating due to clogging or over-input of the heat exchanger, causing cracks or perforations, from which high-temperature exhaust gas leaks and burns the outer casing, causing a fire. There is an overheat prevention device for The overheat prevention device is provided with an overheat detection plate provided with a plurality of thermal fuses connected by lead wires between the rear surface of the combustion chamber and the outer casing, and the thermal fuse is connected to a combustion control circuit. When the high temperature exhaust gas leaked from the perforated hole melts the thermal fuse, the gas supply is immediately stopped. In addition, in order to avoid damage due to freezing of the water supply and hot water supply pipes in winter, heaters operated by thermal switches are installed at several places, and if there is a possibility of freezing, the water supply and hot water supply pipes are heated. In addition, a freezing prevention device for preventing freezing is also provided.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、このよ
うな過熱防止装置や凍結防止装置は、給湯動作には直接
必要とされないものの、安全面や器具の保護のために無
くすことはできず、その分コストが高くなってしまうと
いった問題があった。
However, such an overheat prevention device and an antifreeze device are not directly required for the hot water supply operation but cannot be eliminated for safety and protection of the equipment. There was a problem that the cost would increase.

【0004】本発明の給湯器は上記課題を解決し、過熱
防止や凍結防止を安価な構成で行なうことを目的とす
る。
[0004] It is an object of the present invention to solve the above-mentioned problems and to prevent overheating and freezing with an inexpensive configuration.

【0005】[0005]

【課題を解決するための手段】上記課題を解決する本発
明の請求項1記載の給湯器は、燃料ガスを燃焼するバー
ナと、上記バーナの燃焼が行なわれる燃焼室と、上記燃
焼室を収納する外胴ケーシングと、上記燃焼室と上記外
胴ケーシングとの間に設けられ、上記燃焼室の過熱を検
出する過熱検出手段と、上記過熱検出手段による過熱の
検出に基づいて上記バーナの燃焼を停止するか或は異常
報知する燃焼制御手段とを備えた給湯器において、上記
過熱検出手段は、絶縁基板面全域に温度により抵抗が変
化する導電体を備え、該導電体に通電して検出した抵抗
値に基づいて上記燃焼室の過熱を検出すると共に、燃焼
停止時に凍結の恐れがある場合には該導電体への通電量
を大きくして発熱させることを要旨とする。
According to a first aspect of the present invention, there is provided a water heater, comprising: a burner for burning fuel gas; a combustion chamber for burning the burner; An outer body casing to be provided, provided between the combustion chamber and the outer body casing, an overheat detecting means for detecting overheating of the combustion chamber, and the combustion of the burner based on the detection of overheating by the overheat detecting means. In a water heater provided with combustion control means for stopping or notifying an abnormality, the overheat detecting means includes a conductor whose resistance changes according to temperature over the entire surface of the insulating substrate, and the conductor is detected by energizing the conductor. The gist of the present invention is to detect overheating of the combustion chamber based on the resistance value and, when there is a possibility of freezing when the combustion is stopped, increase the amount of electricity to the conductor to generate heat.

【0006】上記課題を解決する本発明の請求項2記載
の給湯器は、請求項1記載の給湯器において、上記導電
体は自己発熱により抵抗値が増加することにより、電流
を減少させて自身で温度制御することを要旨とする。
According to a second aspect of the present invention, there is provided a water heater in accordance with the first aspect of the present invention, wherein the electric conductor reduces the current by increasing the resistance value due to self-heating. The point is that the temperature is controlled by.

【0007】上記課題を解決する本発明の請求項3記載
の給湯器は、請求項1又は2記載の給湯器において、上
記導電体はカーボンと樹脂との混合物であることを要旨
とする。
According to a third aspect of the present invention, there is provided a water heater according to the first or second aspect, wherein the conductor is a mixture of carbon and resin.

【0008】上記構成を有する本発明の請求項1記載の
給湯器は、絶縁基板全体に設けられた導電体に通電し
て、その抵抗値を検出する。ここで燃焼室が異常過熱し
た場合には導電体の抵抗値が変化し、その抵抗変化を検
出することで異常過熱を検出してバーナの燃焼を停止す
るか或は異常報知する。また燃焼停止時に凍結の恐れが
ある場合には、導電体への通電量を増加させることで発
熱させ、凍結を防止する。
[0008] In the water heater having the above structure according to the first aspect of the present invention, a current is supplied to a conductor provided on the entire insulating substrate, and the resistance value is detected. If the combustion chamber is overheated abnormally, the resistance value of the conductor changes, and by detecting the resistance change, abnormal overheating is detected to stop the burner combustion or to notify the abnormality. If there is a risk of freezing when the combustion is stopped, the amount of electricity supplied to the conductor is increased to generate heat and prevent freezing.

【0009】上記構成を有する本発明の請求項2記載の
給湯器は、自己発熱により抵抗値が増加して通電量を減
らし、温度が過剰に上昇することを防ぐことができる。
In the water heater according to the second aspect of the present invention having the above structure, the resistance value increases due to self-heating, the amount of electricity is reduced, and it is possible to prevent the temperature from rising excessively.

【0010】上記構成を有する本発明の請求項3記載の
給湯器は、導電体をカーボンと樹脂との混合体とするこ
とで、温度変化により樹脂が熱膨張収縮して、分散して
いるカーボン粒子間の距離を変えることにより、抵抗値
が急激に変化するため、部分的な過熱でも全体の抵抗変
化を検出しやすくなる。
[0010] In the water heater according to the third aspect of the present invention having the above-mentioned structure, the resin is thermally expanded and contracted by a temperature change by dispersing the carbon by using a mixture of carbon and resin. By changing the distance between the particles, the resistance value changes abruptly, so that even a partial overheating makes it easy to detect a change in the entire resistance.

【0011】[0011]

【発明の実施の形態】以上説明した本発明の構成・作用
を一層明らかにするために、以下本発明の給湯器の好適
な実施例について説明する。図1は本発明の一実施例と
しての給湯器の概略構成図である。この給湯器は、ブラ
ケット30により壁に取付けされる外胴ケーシング11
と、外胴ケーシング11内の略中央に設けられた燃焼室
12と、燃焼室12の上方に設けられ、供給される水を
加熱して出湯する熱交換器13と、燃焼室12内でガス
燃焼を行なうバーナ14と、燃焼用空気を燃焼室12内
へ供給する給気ファン15と、給気ファン15から吐出
された燃焼用空気を整流してバーナ14へ送る多孔整流
板16とが設けられる。また、バーナ14へのガス供給
路としてのガス導管17にはその上流側からガス流路を
開閉する元電磁弁18と、ガス流量を調節する比例弁1
9とが設けられる。そして、こうしたガス供給量や空気
供給量は、コントローラ20により制御される。また、
燃焼室12及び熱交換器13の背面に向い合って過熱防
止と凍結防止とを行なう過熱凍結防止装置40が外胴ケ
ーシング11に取付けられる。
BEST MODE FOR CARRYING OUT THE INVENTION In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the water heater of the present invention will be described below. FIG. 1 is a schematic configuration diagram of a water heater as one embodiment of the present invention. The water heater includes an outer body casing 11 attached to a wall by a bracket 30.
A combustion chamber 12 provided substantially at the center of the outer casing 11; a heat exchanger 13 provided above the combustion chamber 12 for heating supplied water to discharge hot water; A burner 14 for performing combustion, an air supply fan 15 for supplying combustion air into the combustion chamber 12, and a perforated rectifying plate 16 for rectifying the combustion air discharged from the air supply fan 15 and sending the rectified air to the burner 14 are provided. Can be A gas conduit 17 serving as a gas supply path to the burner 14 has a main solenoid valve 18 for opening and closing a gas flow path from the upstream side thereof, and a proportional valve 1 for adjusting a gas flow rate.
9 are provided. The gas supply amount and the air supply amount are controlled by the controller 20. Also,
An overheat freezing prevention device 40 that faces the back of the combustion chamber 12 and the heat exchanger 13 to prevent overheating and freezing is attached to the outer casing 11.

【0012】コントローラ20は、図示しない周知の算
術論理演算回路を構成するCPU,RAM,ROMと、
各種センサからの信号を入力する入力インタフェース
と、各種アクチュエータに駆動信号を出力する出力イン
タフェース等から構成される。また、コントローラ20
は、入水温度を検出する入水サーミスタ(図示略)によ
り止水時の水温変化を検出し、凍結の恐れがあるかどう
かをチェックする。
The controller 20 includes a CPU, a RAM, and a ROM constituting a well-known arithmetic and logic operation circuit (not shown);
It comprises an input interface for inputting signals from various sensors, an output interface for outputting drive signals to various actuators, and the like. The controller 20
Detects a change in water temperature at the time of water stoppage by a water input thermistor (not shown) for detecting the water input temperature, and checks whether there is a possibility of freezing.

【0013】過熱凍結防止装置40は、図2に示すよう
に、樹脂製の絶縁シート41に導電性カーボンと樹脂
(本実施例ではフッ素樹脂を用いる)との混合物である
カーボンインクで、一本の蛇行線状の一連の導電パター
ン42を全域にわたって均一に印刷したものである。そ
して、この過熱凍結防止装置40は、燃焼室12及び熱
交換器13と外胴ケーシング11の後面との間に挿入設
置され、燃焼室12と熱交換器13の背面全域を覆うと
共に、導電パターン42からのリード線43を介してコ
ントローラ20に接続されている。
As shown in FIG. 2, the overheating / freezing prevention device 40 is composed of a carbon ink which is a mixture of conductive carbon and a resin (in this embodiment, a fluororesin is used) on a resin insulating sheet 41. Are printed uniformly over the entire area. The overheating / freezing prevention device 40 is inserted and installed between the combustion chamber 12 and the heat exchanger 13 and the rear surface of the outer casing 11, and covers the entire rear surface of the combustion chamber 12 and the heat exchanger 13 and also has a conductive pattern. It is connected to the controller 20 via a lead wire 43 from.

【0014】カーボンインクは、温度変化によりフッ素
樹脂が熱膨張収縮して、分散している導電性カーボン粒
子間の距離を変える。そのため図3のグラフに示すよう
に、カーボンインクの電気抵抗は温度変化により急激に
変化する。尚、本実施例のカーボンインクは100℃附
近で急激に抵抗値が変化するように設定してある。
In the carbon ink, the fluororesin undergoes thermal expansion and contraction due to a temperature change, thereby changing the distance between the dispersed conductive carbon particles. Therefore, as shown in the graph of FIG. 3, the electrical resistance of the carbon ink changes rapidly with a change in temperature. Incidentally, the carbon ink of this embodiment is set so that the resistance value rapidly changes around 100 ° C.

【0015】ここで、導電パターン42を図4に示すよ
うに長さLで断面積がSとした場合、全体の抵抗値R
は、 R=ρL/S (ρ:体積抵抗率) となる。ここで、部分的な過熱により、長さLaの部分
だけが過熱されると、全体の抵抗Raは、 Ra=ρ(L−La)/S+ρaLa/S (ρa:過熱部分の体積抵抗率) となる。部分的な過熱であるため過熱部分の長さLaは
全体の長さLに比べはるかに小さく、L−La=Lと近
似でき、 Ra/R=1+ρaLa/ρL となる。この式から、LaがLに比べはるかに小さくて
も、ρaがρに比べはるかに大きければ、抵抗変化が検
出可能であることが分かる。カーボンインクの抵抗変化
は急激であるため、部分的な過熱であっても十分検出が
可能となる。導電パターン42は絶縁シート41の全域
にわたって印刷されているため、燃焼室のどの部分に穴
があいても確実に検出できる。
Here, when the conductive pattern 42 has a length L and a cross-sectional area S as shown in FIG.
Is R = ρL / S (ρ: volume resistivity). Here, when only the portion having the length La is overheated due to partial overheating, the overall resistance Ra is as follows: Ra = ρ (L−La) / S + ρaLa / S (ρa: volume resistivity of the heated portion) Become. Because of partial heating, the length La of the superheated portion is much smaller than the entire length L, and can be approximated as L-La = L, and Ra / R = 1 + ρaLa / ρL. From this equation, it can be seen that even if La is much smaller than L, if ρa is much larger than ρ, the resistance change can be detected. Since the resistance change of the carbon ink is abrupt, detection can be sufficiently performed even with partial overheating. Since the conductive pattern 42 is printed over the entire area of the insulating sheet 41, it is possible to reliably detect a hole in any part of the combustion chamber.

【0016】バーナ14の燃焼動作中には、過熱凍結防
止装置40は燃焼室12の異常過熱を検出するが、バー
ナ14の燃焼停止中に凍結の恐れがある場合には、凍結
防止ヒータとなって給水路及び出湯路を加熱して、凍結
を防止する。図5は導電パターン42への通電回路の概
略図である。この回路は、導電パターン42の抵抗値R
よりはるかに大きい抵抗値Rbをもつ抵抗Rbと、抵抗
Rbを短絡する電気経路のスイッチングを行なうリレー
X1とからなり、電圧Vが印加されている。通常はリレ
ーをOFFし、点aの電位を検出する。点aの電位Va
は、 Va=V×R/(R+Rb) となり、燃焼室12の異常過熱により抵抗値Rが上昇す
ると電位Vaも上昇するため、電位Vaを検出すること
で異常過熱の検出が可能となる。
During the burning operation of the burner 14, the overheat / freezing prevention device 40 detects abnormal overheating of the combustion chamber 12, but when there is a possibility of freezing while the combustion of the burner 14 is stopped, the overheating / freezing prevention device 40 becomes an antifreezing heater. To heat the water supply channel and tap water channel to prevent freezing. FIG. 5 is a schematic diagram of a circuit for energizing the conductive pattern 42. In this circuit, the resistance value R of the conductive pattern 42 is
A voltage V is applied to a resistor Rb having a much larger resistance value Rb and a relay X1 for switching an electric path for short-circuiting the resistor Rb. Normally, the relay is turned off and the potential at the point a is detected. Potential Va at point a
Is as follows: Va = V × R / (R + Rb), and when the resistance value R increases due to abnormal overheating of the combustion chamber 12, the potential Va also increases. Therefore, the abnormal overheating can be detected by detecting the potential Va.

【0017】また、バーナ14の燃焼停止中に、入水サ
ーミスタの検出する温度変化により凍結の恐れがあると
判断した場合には、リレーX1をONして導電パターン
42への通電量を増加させる。そのため導電パターン4
2は発熱するが、温度が上昇すると抵抗値が増加するた
め自身で電流値を減らし、発熱温度を一定に保つ。その
ため発熱温度が過剰に上昇することを防止できる。
If it is determined that there is a possibility of freezing due to a temperature change detected by the water inflow thermistor while the combustion of the burner 14 is stopped, the relay X1 is turned on to increase the amount of electricity to the conductive pattern 42. Therefore, the conductive pattern 4
2 generates heat, but since the resistance increases as the temperature rises, the current value is reduced by itself and the heat generation temperature is kept constant. Therefore, it is possible to prevent the heat generation temperature from excessively increasing.

【0018】次に、本実施例の給湯器の動作について説
明する。燃焼動作の間、コントローラ20は点aの電位
Vaを検出する。熱交換器13の詰まりやオーバーイン
プットにより燃焼室12が異常過熱してひび割れや穴あ
きを生じると、給気ファン15により燃焼室12内の圧
力が高くなっているため、ひび割れ等から高温の排ガス
が噴出され、導電パターン42を部分的に過熱する。そ
のため導電パターン42の抵抗値が増加して電位Vaが
所定値以上になると、元電磁弁18を閉弁して燃焼動作
を停止すると共に、異常報知を行なう。
Next, the operation of the water heater of this embodiment will be described. During the combustion operation, the controller 20 detects the potential Va at the point a. If the combustion chamber 12 is abnormally overheated due to clogging or over-input of the heat exchanger 13 and cracks or perforations are generated, the pressure in the combustion chamber 12 is increased by the air supply fan 15 and high-temperature exhaust gas Is jetted, and the conductive pattern 42 is partially heated. Therefore, when the resistance value of the conductive pattern 42 increases and the potential Va becomes equal to or higher than a predetermined value, the original electromagnetic valve 18 is closed to stop the combustion operation and to notify an abnormality.

【0019】また、燃焼停止中に入水サーミスタの検出
温度の変化により、凍結の恐れがあると判断した場合に
は、リレーをONして導電パターン42への通電量を増
加させて発熱させ、凍結することを防ぐ。
If it is determined that there is a possibility of freezing due to a change in the temperature detected by the water inflow thermistor while the combustion is stopped, the relay is turned on to increase the amount of electricity supplied to the conductive pattern 42 to generate heat, thereby causing freezing. To prevent

【0020】以上説明したように、本実施例の給湯器に
よれば、過熱防止装置と凍結防止装置とを一体として形
成したことにより、それぞれを別々に設けるといった構
成に比べ、コストを低減できる。また、絶縁シート41
に導電パターン42を印刷するといった簡単な構成なの
で、製造コストを低減できる。また、導電パターン42
が絶縁シート41の全域にわたって均一に印刷されてお
り、更にカーボンインクの抵抗変化が急激であることに
より、部分的な過熱であっても検出することができるた
め、安全性が高い。また、凍結防止時には、導電パター
ン42が自己温度制御するため、オーバーヒートの心配
がなく安全である。また、通常出湯温制御に用いる入水
サーミスタの検出温度の変化から凍結の恐れがあるかど
うかを判断しているため、別に温度センサを設ける必要
がなくコストを低減できる。
As described above, according to the water heater of the present embodiment, since the overheating prevention device and the antifreezing device are integrally formed, the cost can be reduced as compared with a configuration in which each device is separately provided. Also, the insulating sheet 41
Since the conductive pattern 42 is simply printed, the manufacturing cost can be reduced. The conductive pattern 42
Is uniformly printed over the entire area of the insulating sheet 41. Further, since the resistance change of the carbon ink is abrupt, even partial overheating can be detected, so that the safety is high. Further, at the time of freezing prevention, since the conductive pattern 42 controls its own temperature, there is no fear of overheating, and thus it is safe. Further, since it is determined whether or not there is a possibility of freezing based on a change in the detected temperature of the incoming water thermistor used for the ordinary hot water temperature control, it is not necessary to provide a separate temperature sensor, and the cost can be reduced.

【0021】尚、本実施例においては、入水サーミスタ
の検出する温度変化によって凍結の恐れがあるかどうか
を判断したが、出湯動作停止してからしばらく後に出湯
温度を検出する出湯サーミスタの検出値により判断しも
よく、また簡易的なサーミスタを例えばコントローラ2
0の基板上に設けて外気温を検出してもよく、またサー
マルスイッチ等の温度変化によりON/OFFするスイ
ッチにより導電パターン42への通電をON/OFFし
てもよい。
In the present embodiment, it is determined whether or not there is a possibility of freezing based on a temperature change detected by the water entering thermistor. However, after a short time from the stop of the tapping operation, the detected value of the tapping thermistor which detects the tapping temperature is used. A simple thermistor may be used, for example, the controller 2
The temperature of the conductive pattern 42 may be turned on / off by a switch such as a thermal switch that is turned on / off by a temperature change such as a thermal switch.

【0022】以上本発明の実施例について説明したが、
本発明はこうした実施例に何等限定されるものではな
く、本発明の要旨を逸脱しない範囲において、種々なる
態様で実施し得ることは勿論である。
The embodiment of the present invention has been described above.
The present invention is not limited to these embodiments at all, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

【0023】[0023]

【発明の効果】以上詳述したように、本発明の請求項1
記載の給湯器によれば、導電体を備えた絶縁基板によ
り、異常過熱の検出と凍結防止のための加熱との両方を
行なうため、従来のように異常過熱装置と凍結防止装置
とを別々に設けるといった構成に比べ、コストを低減で
きる。また、導電体が絶縁基板全体に設けられているこ
とにより、部分的な異常過熱をその発生場所によらず検
出できるため安全性が高い。
As described in detail above, claim 1 of the present invention
According to the water heater described, since both the detection of abnormal overheating and the heating for freezing prevention are performed by the insulating substrate provided with the conductor, the abnormal heating device and the freezing prevention device are separately provided as in the related art. The cost can be reduced as compared with a configuration in which such an arrangement is provided. In addition, since the conductor is provided on the entire insulating substrate, partial abnormal overheating can be detected irrespective of the location where the overheating occurs, so that the safety is high.

【0024】更に、本発明の請求項2記載の給湯器によ
れば、自己発熱により抵抗値が増加して通電量を減ら
し、温度が過剰に上昇することを防ぐため、オーバーヒ
ートの心配がなく安全である。
Further, according to the water heater according to the second aspect of the present invention, the resistance value increases due to self-heating, the amount of electricity is reduced, and the temperature is prevented from rising excessively. It is.

【0025】更に、本発明の請求項3記載の給湯器によ
れば、温度変化に対する抵抗変化が急激であることによ
り、部分的な過熱でも検出しやすくなるため、安全性が
高い。
Further, according to the water heater according to the third aspect of the present invention, since the resistance change with respect to the temperature change is abrupt, it becomes easy to detect even partial overheating, so that the safety is high.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施例としての給湯器の概略構成図
である。
FIG. 1 is a schematic configuration diagram of a water heater as one embodiment of the present invention.

【図2】過熱凍結防止装置の概略構成図である。FIG. 2 is a schematic configuration diagram of an overheat freezing prevention device.

【図3】カーボンインクの温度−抵抗特性を表すグラフ
である。
FIG. 3 is a graph showing temperature-resistance characteristics of carbon ink.

【図4】導電パターンの概略図である。FIG. 4 is a schematic view of a conductive pattern.

【図5】導電パターンへの通電回路の概略図である。FIG. 5 is a schematic diagram of a circuit for energizing a conductive pattern.

【符号の説明】[Explanation of symbols]

11…外胴ケーシング、 12…燃焼室、 13…熱交
換器、 14…バーナ、15…給気ファン、 20…コ
ントローラ、 40…過熱凍結防止装置、41…絶縁シ
ート、 42…導電パターン。
DESCRIPTION OF SYMBOLS 11 ... Outer body casing, 12 ... Combustion chamber, 13 ... Heat exchanger, 14 ... Burner, 15 ... Air supply fan, 20 ... Controller, 40 ... Overheat freezing prevention device, 41 ... Insulating sheet, 42 ... Conductive pattern.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 燃料ガスを燃焼するバーナと、 上記バーナの燃焼が行なわれる燃焼室と、 上記燃焼室を収納する外胴ケーシングと、 上記燃焼室と上記外胴ケーシングとの間に設けられ、上
記燃焼室の過熱を検出する過熱検出手段と、 上記過熱検出手段による過熱の検出に基づいて上記バー
ナの燃焼を停止するか或は異常報知する燃焼制御手段と
を備えた給湯器において、 上記過熱検出手段は、絶縁基板面全域に温度により抵抗
が変化する導電体を備え、該導電体に通電して検出した
抵抗値に基づいて上記燃焼室の過熱を検出すると共に、
燃焼停止時に凍結の恐れがある場合には該導電体への通
電量を大きくして発熱させることを特徴とする給湯器。
1. A burner for burning fuel gas, a combustion chamber for burning the burner, an outer casing for housing the combustion chamber, and provided between the combustion chamber and the outer casing, A water heater comprising: overheat detecting means for detecting overheating of the combustion chamber; and combustion control means for stopping combustion of the burner based on detection of overheating by the overheat detecting means or for reporting abnormality. The detection means includes a conductor whose resistance changes with temperature over the entire surface of the insulating substrate, and detects overheating of the combustion chamber based on a resistance value detected by energizing the conductor,
A water heater characterized in that when there is a risk of freezing when the combustion is stopped, the amount of electricity supplied to the conductor is increased to generate heat.
【請求項2】 上記導電体は自己発熱により抵抗値が増
加することにより、電流を減少させて自身で温度制御す
ることを特徴とする請求項1記載の給湯器。
2. The water heater according to claim 1, wherein the resistance of the conductor is increased by self-heating, thereby reducing the current and controlling the temperature by itself.
【請求項3】 上記導電体はカーボンと樹脂との混合物
であることを特徴とする請求項1又は2記載の給湯器。
3. The water heater according to claim 1, wherein the conductor is a mixture of carbon and resin.
JP20329296A 1996-07-11 1996-07-11 Water heater Expired - Fee Related JP3472414B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20329296A JP3472414B2 (en) 1996-07-11 1996-07-11 Water heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20329296A JP3472414B2 (en) 1996-07-11 1996-07-11 Water heater

Publications (2)

Publication Number Publication Date
JPH1026345A true JPH1026345A (en) 1998-01-27
JP3472414B2 JP3472414B2 (en) 2003-12-02

Family

ID=16471632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20329296A Expired - Fee Related JP3472414B2 (en) 1996-07-11 1996-07-11 Water heater

Country Status (1)

Country Link
JP (1) JP3472414B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9614362B2 (en) 2013-11-28 2017-04-04 Kyocera Document Solutions Inc. Overcurrent protection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9614362B2 (en) 2013-11-28 2017-04-04 Kyocera Document Solutions Inc. Overcurrent protection device

Also Published As

Publication number Publication date
JP3472414B2 (en) 2003-12-02

Similar Documents

Publication Publication Date Title
US7083408B1 (en) Apparatus and method for shutting down a fuel fired appliance
JP6874311B2 (en) Hot water equipment
JP3472414B2 (en) Water heater
KR100744574B1 (en) Device for preventing overheating of electric warming mat
JP2017211103A (en) Water heater
JP3545134B2 (en) Electric heating equipment security device
JP4190057B2 (en) Overheat prevention device for combustion equipment
JP3904164B2 (en) Combustion stop device for abnormal overheating of combustion heater for vehicles
JP2985412B2 (en) Appliance safety devices
JP3571847B2 (en) Combustion device proportional valve drive circuit
KR102043094B1 (en) Induction Heating Device with Overheat Preventing Funtion for Vehicle
JP3943723B2 (en) Overheat prevention device for combustion equipment
KR100579439B1 (en) Liquid heater using the positive temperature coefficient thermistor
JP5480506B2 (en) Combustion control device
JPH04198616A (en) Safety device of combustion apparatus
KR950000931B1 (en) Fan heater
JP3191368B2 (en) Safety devices for heating appliances
JP3704669B2 (en) Overheat prevention device for combustion equipment
JP2001280704A (en) Fluid heater and private part cleaner
KR0129534Y1 (en) Heater of electrical boiler in momentary heating system
KR880004283Y1 (en) Co gas detection device
JP2004087375A (en) Heating wire controlling equipment
JPS6310432Y2 (en)
JP2001065037A (en) Ceramic heater, calorifier using this and sanitary cleaning device having this
JPH0370939A (en) Combustion heater

Legal Events

Date Code Title Description
R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees