JP2870789B2 - Overheat prevention device for electric heater device - Google Patents
Overheat prevention device for electric heater deviceInfo
- Publication number
- JP2870789B2 JP2870789B2 JP1054811A JP5481189A JP2870789B2 JP 2870789 B2 JP2870789 B2 JP 2870789B2 JP 1054811 A JP1054811 A JP 1054811A JP 5481189 A JP5481189 A JP 5481189A JP 2870789 B2 JP2870789 B2 JP 2870789B2
- Authority
- JP
- Japan
- Prior art keywords
- electric heater
- circuit
- main circuit
- operating
- temperature
- 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
- Control Of Resistance Heating (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は電気ヒータ装置の過熱防止装置に関し、特に
温度ヒューズを用いて過熱を防止するものの改良に関す
る。Description: TECHNICAL FIELD The present invention relates to a device for preventing overheating of an electric heater device, and more particularly to an improvement of a device for preventing overheating by using a thermal fuse.
（従来の技術） 従来より、この種の電気ヒータ装置の過熱防止装置と
して、例えば実公昭60−1483号公報に開示されるよう
に、電気ヒータを作動させる主回路に温度ヒューズを配
置して、該温度ヒューズの溶断動作により主回路を断っ
て電気ヒータの作動を停止させるもの、又は電気ヒータ
への通電を制御する接触器を操作する操作回路に温度ヒ
ューズを配置し、この温度ヒューズの動作により接触器
の接点を開放して、電気ヒータの作動を停止させるもの
が知られている。(Prior Art) Conventionally, as a device for preventing overheating of this kind of electric heater device, for example, as disclosed in Japanese Utility Model Publication No. 60-1483, a thermal fuse is arranged in a main circuit for operating an electric heater. The main fuse is cut off by the fusing operation of the thermal fuse to stop the operation of the electric heater, or a thermal fuse is arranged in an operation circuit for operating a contactor for controlling the energization of the electric heater. There is known a device in which a contact of a contactor is opened to stop the operation of an electric heater.
（発明が解決しようとする課題） しかしながら、前者にあっては、電気ヒータの容量が
大きい場合には、大電流定格の温度ヒューズが市販され
ていないために、小容量定格の多数の温度ヒューズを主
回路に並列に設けて使用する必要が生じる。このため、
電気ヒータの過熱時に全ての温度ヒューズが有効に動作
させる、換言すれば、過熱時に電気ヒータ装置周辺の温
度が電気用品取締法の規格値を越えないように各温度ヒ
ューズを動作させるには、温度ヒューズの個数が多い故
に、また電源欠相時等も考慮することも加わって、各々
の温度ヒューズの取付位置のための工数が多大で且つ困
難な作業になる欠点がある。(Problems to be Solved by the Invention) However, in the former, when the capacity of the electric heater is large, a large-current rated thermal fuse is not commercially available, so that a large number of small-capacity rated thermal fuses are required. It is necessary to use the main circuit in parallel. For this reason,
To operate all thermal fuses effectively when the electric heater overheats, in other words, to operate each thermal fuse so that the temperature around the electric heater device does not exceed the standard value of the Electrical Appliance and Material Control Law when overheating, Due to the large number of fuses and the fact that the phase of the power supply is lost is also taken into consideration, there is a disadvantage that the number of steps for mounting each thermal fuse is large and difficult.
一方、後者のものでは、操作回路に配置する関係上小
容量の温度ヒューズでよいから、その取付位置の選定は
比較的容易であるものの、接触器の接点溶着による電気
ヒータの過熱時には、温度ヒューズが動作しても過熱は
防止できない欠点がある。On the other hand, in the latter case, a small-capacity thermal fuse may be used due to the arrangement in the operation circuit. Therefore, the mounting position can be relatively easily selected. However, there is a disadvantage that overheating cannot be prevented even if it operates.
本発明は斯かる点に鑑みてなされたものであり、その
目的は、主回路に配置する多数の小容量の温度ヒューズ
の取付を少い工数で簡易に行うと共に、接触器の接点溶
着時でも電気ヒータの過熱を有効に防止することにあ
る。The present invention has been made in view of the above point, and an object of the present invention is to easily attach a large number of small-capacity thermal fuses arranged in a main circuit with a small number of man-hours, and even when welding contacts of a contactor. An object of the present invention is to effectively prevent overheating of an electric heater.
（課題を解決するための手段） 以上の目的を達成するため、本出願の請求項１に係る
発明では、接触器を有し、電気ヒータを作動させるため
に電源から電気ヒータに給電する主回路と、上記電気ヒ
ータへの通電を制御するために接触器を操作する操作回
路とを備えた電気ヒータ装置を前提としている。(Means for Solving the Problems) In order to achieve the above object, in the invention according to claim 1 of the present application, a main circuit having a contactor and supplying power from a power supply to the electric heater to operate the electric heater. And an operation circuit for operating a contactor to control the energization of the electric heater.
そして、上記主回路に配置され、上記電気ヒータの容
量に合った主回路用温度ヒューズを備えている。Further, a temperature fuse for the main circuit, which is arranged in the main circuit and matches the capacity of the electric heater, is provided.
加えて、上記操作回路に配置され、動作温度が上記主
回路用温度ヒューズの動作温度よりも低く設定された小
容量の操作回路用温度ヒューズを備えている。In addition, there is provided a small-capacity operating circuit temperature fuse disposed in the operation circuit and having an operating temperature set lower than the operating temperature of the main circuit temperature fuse.
（作用） 以上の構成により、請求項１に係る発明では、電気ヒ
ータが大容量のものの場合には、主回路に配置する温度
ヒューズは小容量ものを多数個並列に配置する構成とな
るが、電気ヒータ装置周辺の温度は操作回路用温度ヒュ
ーズで規格値を越えないように規制できるので、主回路
用温度ヒューズの動作温度は高く設定しても支障がな
く、このことにより主回路用温度ヒューズの取付位置の
選択の自由度が高くなるので、工数が有効に低減される
と共に、その取付が簡易に行われる。(Operation) According to the above configuration, in the invention according to claim 1, when the electric heater has a large capacity, a large number of small-capacity thermal fuses are arranged in parallel in the main circuit. The temperature around the electric heater device can be regulated so as not to exceed the standard value by the operating circuit thermal fuse. Therefore, there is no problem even if the operating temperature of the main circuit thermal fuse is set to a high value. Since the degree of freedom in selecting the mounting position is increased, the man-hour is effectively reduced and the mounting is easily performed.
しかも、接触器が接点溶着した場合にも、主回路用温
度ヒューズが動作するので、電気ヒータの過熱が有効に
防止される。Moreover, even when the contactor is welded to the contactor, the temperature fuse for the main circuit operates, so that overheating of the electric heater is effectively prevented.
特に、操作回路用温度ヒューズが主回路用温度ヒュー
ズより先に動作して過熱を防止するので、温度ヒューズ
の交換時には、操作回路用温度ヒューズの交換のみでよ
くなり、修理作業性の向上を図ることができる。In particular, since the thermal fuse for the operating circuit operates before the thermal fuse for the main circuit to prevent overheating, only the thermal fuse for the operating circuit needs to be replaced when replacing the thermal fuse, thereby improving repair workability. be able to.
（発明の効果） 以上説明したように、本出願の請求項１に係る発明で
は、電気ヒータの操作回路及び主回路の各々に温度ヒュ
ーズを配置したので、接触器の接点溶着時にも電気ヒー
タの過熱を防止できると共に、主回路用小容量の多数の
温度ヒューズの取付を少い工数で簡易に行うことができ
る。(Effects of the Invention) As described above, in the invention according to claim 1 of the present application, the temperature fuse is disposed in each of the operation circuit and the main circuit of the electric heater. Overheating can be prevented, and a large number of thermal fuses having a small capacity for the main circuit can be easily mounted with a small number of steps.
特に、電気ヒータの過熱の防止後の修理作業時には、
操作回路用温度ヒューズのみを交換すればよいので、そ
の作業性の向上を図ることができる。In particular, during repair work after preventing overheating of the electric heater,
Since only the thermal fuse for the operating circuit needs to be replaced, the workability can be improved.
（実施例） 以下、本発明の実施例を図面に基いて説明する。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図は本発明に係る電気ヒータ装置の過熱防止装置
の電気回路を示す。同図において、（１）は三相用の電
気ヒータ、（２）は該電気ヒータ（１）をＹ接続し、三
相電源のＲ相,S相及びＴ相から三相交流を上記電気ヒー
タ（１）に給電する主回路である。FIG. 1 shows an electric circuit of a device for preventing overheating of an electric heater device according to the present invention. In the figure, (1) is a three-phase electric heater, (2) is a Y-connection of the electric heater (1), and a three-phase AC is supplied from the R, S, and T phases of the three-phase power supply to the electric heater. This is the main circuit that supplies power to (1).
また、（52H）は上記主回路（２）の各相に介設され
た接点（52H−R,52H−S,52H−Ｔ）を有して電気ヒータ
（１）への通電を制御し、その閉時に電気ヒータ（１）
を作動させる接触器、（52F）は上記電気ヒータ（１）
に備える送風ファン用のリレーである。さらに、（５）
は上記接触器（52H）及び送風ファン用リレー（52F）を
並列接続し、これ等に三相電源のＲ相及びＳ相の二相か
ら給電して上記接触器（52H）を操作する操作回路であ
る。該操作回路（５）には、上記電気ヒータ（１）に対
する自動復帰形の過熱防止器（26AH）と、開操作される
停止ボタン（６）と、閉操作される運転ボタン（７）と
が介設され、該運転ボタン（７）には並列に上記送風フ
ァン用リレー（52F）の自己保持接点（52F−１）が接続
されている。また、上記接触器（52H）側には、電気ヒ
ータ（１）の温度を調整する温度調整器（23A）が介設
されていて、該温度調整器（23A）の開動作時には接触
器（52H）の接点（52H−R,52H−S,52H−Ｔ）を開動作さ
せて、電気ヒータ（１）の通電を停止させる。(52H) has contacts (52H-R, 52H-S, 52H-T) interposed in each phase of the main circuit (2) to control the energization of the electric heater (1); Electric heater when closed (1)
(52F) is the electric heater (1)
It is a relay for the blower fan provided for the. Furthermore, (5)
Is an operation circuit for operating the contactor (52H) by connecting the contactor (52H) and the blower fan relay (52F) in parallel and supplying power to them from two phases of R and S phases of a three-phase power supply. It is. The operation circuit (5) includes an automatic reset type overheat protector (26AH) for the electric heater (1), a stop button (6) to be opened, and an operation button (7) to be closed. The self-holding contact (52F-1) of the blower fan relay (52F) is connected in parallel with the operation button (7). Further, a temperature controller (23A) for adjusting the temperature of the electric heater (1) is provided on the side of the contactor (52H). When the temperature controller (23A) is opened, the contactor (52H) is opened. ) To open the contacts (52H-R, 52H-S, 52H-T) to stop energization of the electric heater (1).
而して、上記主回路（２）には、電気ヒータ（１）の
容量に合った定格容量の温度ヒューズ（10）が電源のＲ
相及びＳ相に配置されている。この温度ヒューズ（10）
は、具体的には多数の小容量の温度ヒューズを並列に接
続して用いる。一方、操作回路（５）には、過熱防止器
（26AH）の電源側にて小容量の温度ヒューズ（11）が配
置されている。In the main circuit (2), a temperature fuse (10) having a rated capacity corresponding to the capacity of the electric heater (1) is provided with a power supply R.
Phase and S phase. This thermal fuse (10)
Specifically, a large number of small-capacity thermal fuses are connected in parallel and used. On the other hand, in the operation circuit (5), a small-capacity thermal fuse (11) is arranged on the power supply side of the overheat protector (26AH).
上記操作回路用温度ヒューズ（11）の動作温度HAは、
電気用品取締法で規制される電気ヒータ装置の周囲の上
限外殻温度HOに設定される。また、上記過熱防止器（26
AH）の動作温度HAHと、主回路用温度ヒューズ（10）の
動作温度HMと、操作回路用温度ヒューズ（11）の動作温
度HAとの関係は下記式の通りであり、 HAH＜HA＜HM 操作回路用温度ヒューズ（11）の動作温度HAは、主回路
用温度ヒューズ（10）の動作温度HMよりも低く設定され
ている。具体的には、例えばHAH＝80°、HA＝110°、HM
＝130°である。The operating temperature HA of the operating circuit temperature fuse (11) is
It is set to the upper limit shell temperature H O around the electric heater device regulated by the Electrical Appliance and Material Control Law. In addition, the overheat protector (26
Relationship between the operating temperature H AH of AH), and the operating temperature H M of the main circuit for a thermal fuse (10), and the operating temperature H A temperature fuse operating circuit (11) is as the following equation, H AH operating temperature H a of <H a <H M operating circuit for a thermal fuse (11) is set lower than the operating temperature H M of the main circuit for a thermal fuse (10). Specifically, for example, H AH = 80 °, H A = 110 °, H M
= 130 °.
したがって、上記実施例においては、過熱防止器（26
AH）が故障で電気ヒータ（１）が過熱した時には、電気
ヒータ装置周囲の外殻温度が規格値HOになるまでに操作
回路用温度ヒューズ（11）が溶断動作し、このことによ
り接触器（52H）の接点（52H−R,52H−S,52H−Ｔ）が開
動作して電気ヒータ（１）への通電が阻止されるので、
それ以上の過熱が防止される。Therefore, in the above embodiment, the overheat protector (26
When the electric heater (1) is overheated due to the failure of the electric heater (AH), the temperature fuse (11) for the operation circuit is blown out until the outer shell temperature around the electric heater device reaches the standard value H O , thereby causing the contactor. (52H) The contacts (52H-R, 52H-S, 52H-T) of the (52H) are opened to block the energization of the electric heater (1).
Further overheating is prevented.
ここに、電気ヒータ装置周囲の空気温度を規格値HO以
下に抑える機能は、操作回路用温度ヒューズ（11）が担
うので、主回路用温度ヒューズ（10）の動作温度HMを上
記操作回路用温度ヒューズ（11）の動作温度HMよりも高
く設定しても支障はなく、このことにより主回路用の多
数の小容量の温度ヒューズ（10）の取付位置の自由度が
大きくなって、その取付工数が大きく低減されると共
に、その取付を簡易に行うことができる。しかも、過熱
防止後の温度ヒューズの交換時には、操作回路用温度ヒ
ューズ（11）のみを交換すればよいので、修理作業性が
良い。Here, the function of suppressing the air temperature around the electric heater device to the standard value H O or less is performed by the operating circuit temperature fuse (11). Therefore, the operating temperature H M of the main circuit temperature fuse (10) is set to the operating circuit temperature. no hindrance be set higher than the operating temperature H M of use thermal fuse (11), and the degree of freedom of the mounting position is increased in temperature fuse many smaller for the main circuit by this (10), The man-hour for the attachment is greatly reduced, and the attachment can be easily performed. In addition, when the thermal fuse is replaced after the overheating is prevented, only the thermal fuse (11) for the operation circuit needs to be replaced, so that the repair workability is good.
また、接触器（52H）の接点（52H−R,52H−S,52H−
Ｔ）が溶着している場合には、過熱防止器（26AH）や操
作回路用温度ヒューズ（11）が動作しても電気ヒータ
（１）への通電は続行されるが、主回路用温度ヒューズ
（10）の動作により主回路（２）を遮断して、電気ヒー
タ（１）への通電を阻止できるので、電気ヒータ（１）
のそれ以上の過熱を防止することができ、安全性を向上
できる。In addition, the contacts (52H-R, 52H-S, 52H-
When T) is welded, energization of the electric heater (1) is continued even if the overheat protector (26AH) or the operating circuit temperature fuse (11) operates, but the main circuit temperature fuse does not operate. By the operation of (10), the main circuit (2) can be cut off and the power supply to the electric heater (1) can be prevented.
Can be prevented from further overheating, and safety can be improved.
第１図は本発明の全体構成を示す電気回路図である。 （１）……電気ヒータ、（２）……主回路、（52H）…
…接触器、（52H−R,52H−S,52H−Ｔ）……接点、
（５）……操作回路、（10）……主回路用温度ヒュー
ズ、（11）……操作回路用温度ヒューズ。FIG. 1 is an electric circuit diagram showing the overall configuration of the present invention. (1) ... electric heater, (2) ... main circuit, (52H) ...
... contactor, (52H-R, 52H-S, 52H-T) ...
(5) Operating circuit, (10) Thermal fuse for main circuit, (11) Thermal fuse for operating circuit.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H05B 3/00 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) H05B 3/00
Claims (1)
めに電源から電気ヒータに給電する主回路と、 上記電気ヒータへの通電を制御するために接触器を操作
する操作回路とを備えた電気ヒータ装置において、 上記主回路に配置され、上記電気ヒータの容量に合った
主回路用温度ヒューズと、 上記操作回路に配置され、動作温度が上記主回路用温度
ヒューズの動作温度よりも低く設定された小容量の操作
回路用温度ヒューズと を備えていることを特徴とする電気ヒータ装置の過熱防
止装置。1. A main circuit having a contactor and supplying power to the electric heater from a power supply to operate the electric heater, and an operation circuit for operating the contactor to control power supply to the electric heater. In the electric heater device, a main circuit thermal fuse that is arranged in the main circuit and matches the capacity of the electric heater; and an operating temperature that is arranged in the operating circuit and is lower than the operating temperature of the main circuit thermal fuse. An overheat prevention device for an electric heater device, comprising: a set small capacity thermal fuse for an operation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1054811A JP2870789B2 (en) | 1989-03-07 | 1989-03-07 | Overheat prevention device for electric heater device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1054811A JP2870789B2 (en) | 1989-03-07 | 1989-03-07 | Overheat prevention device for electric heater device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02234378A JPH02234378A (en) | 1990-09-17 |
| JP2870789B2 true JP2870789B2 (en) | 1999-03-17 |
Family
ID=12981098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1054811A Expired - Fee Related JP2870789B2 (en) | 1989-03-07 | 1989-03-07 | Overheat prevention device for electric heater device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2870789B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007275489A (en) * | 2006-04-12 | 2007-10-25 | Nakano Refrigerators Co Ltd | Showcase for cold/hot storage |
| CN104553385A (en) * | 2015-01-05 | 2015-04-29 | 鹏码实业(上海)有限公司 | Heat transfer printing colored tape capable of being used on band-shaped or card-shaped label and preparation method thereof |
-
1989
- 1989-03-07 JP JP1054811A patent/JP2870789B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02234378A (en) | 1990-09-17 |
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