JPH02234378A - Overheat preventing device for electric heater device - Google Patents
Overheat preventing device for electric heater deviceInfo
- Publication number
- JPH02234378A JPH02234378A JP1054811A JP5481189A JPH02234378A JP H02234378 A JPH02234378 A JP H02234378A JP 1054811 A JP1054811 A JP 1054811A JP 5481189 A JP5481189 A JP 5481189A JP H02234378 A JPH02234378 A JP H02234378A
- Authority
- JP
- Japan
- Prior art keywords
- electric heater
- main circuit
- circuit
- temperature
- thermal fuse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000013021 overheating Methods 0.000 claims description 15
- 230000002265 prevention Effects 0.000 claims description 8
- 230000018199 S phase Effects 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
Landscapes
- Control Of Resistance Heating (AREA)
Abstract
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
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an overheating prevention device for an electric heater device, and more particularly to an improvement in an overheating prevention device 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 an overheat prevention device for this type of electric heater device, a thermal fuse is disposed in the main circuit that operates the electric heater, as disclosed in Japanese Utility Model Publication No. 1483/1983, for example. The melting operation of the thermal fuse cuts off the main circuit and stops the operation of the electric heater, or the thermal fuse is placed in the operation circuit that operates the contactor that controls the energization of the electric heater, and the operation of the thermal fuse It is known to open the contacts of a contactor to stop the operation of the 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。(Problem to be Solved by the Invention) However, in the former case, if the capacity of the electric heater is large, many thermal fuses with small capacity ratings are needed because thermal fuses with large current ratings are not commercially available. It becomes necessary to use it in parallel with the main circuit. Therefore, all thermal fuses operate effectively when the electric heater overheats. In other words, in order 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 Materials Control Law during overheating, it is necessary to take into account the large number of thermal fuses and also to take into account situations such as power outage. In addition, there is a drawback that the number of man-hours required for installing 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, with the latter type, a small-capacity thermal fuse is required because it is placed in the operating circuit, so selecting the installation location is relatively easy. Even if it works, it has the disadvantage that overheating cannot be prevented.
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, and its purpose is to easily install a large number of small-capacity thermal fuses to be placed in the main circuit with a small number of man-hours, and also to easily install them even when the contacts of a contactor are welded. The objective 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、電気ヒータへの通電を制御する接触器を操
作する操作回路と、上記接触器により電気ヒータを作動
させる主回路とを備えた電気ヒータ装置における過熱防
止装置を前提として、上記操作回路に小容量の操作回路
用の温度ヒューズを配置すると共に、上記主回路に上記
電気ヒータの容量に合った主回路用温度ヒューズを配置
する構成としている。(Means for Solving the Problems) In order to achieve the above object, the invention according to claim (1) of the present application includes an operation circuit for operating a contactor for controlling energization to an electric heater, and an operation circuit for operating a contactor for controlling energization to an electric heater. Assuming that the overheating prevention device is used in an electric heater device having a main circuit that operates an electric heater, a thermal fuse for a small capacity operation circuit is disposed in the operation circuit, and a temperature fuse for a small capacity operation circuit is provided in the operation circuit, and a The configuration is such that a thermal fuse for the main circuit is placed in accordance with the conditions.
また、請求項（２！に係る発明では、操作回路用温度ヒ
ューズと主回路用温度ヒューズの両動作温度に関係を付
け、前者の動作温度を後者の動作温度よりも低く設定す
る構成としている。Further, in the invention according to claim 2!, the operating temperature of both the operating circuit thermal fuse and the main circuit thermal fuse is related, and the operating temperature of the former is set lower than the operating temperature of the latter.
（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の温度
ヒューズで規格値を越えないように規制できるので、主
回路用の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の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。(Function) According to the above configuration, in the invention according to claim (1), when the electric heater has a large capacity, the thermal fuses arranged in the main circuit have a configuration in which a large number of small capacity thermal fuses are arranged in parallel. However, since the temperature around the electric heater device can be regulated so that it does not exceed the standard value using the thermal fuse for the operating circuit, there is no problem even if the operating temperature of the thermal fuse for the main circuit is set to a high temperature. Since the degree of freedom in selecting the mounting position of the thermal fuse for the circuit is increased, the number of man-hours can be effectively reduced and the mounting can be easily performed.
しかも、接触器が接点溶着した場合にも、主回路用の温
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 if the contacts of the contactor are welded, the main circuit thermal fuse operates, so overheating of the electric heater is effectively prevented.
特に、請求項（２）に係る発明では、操作回路用の温度
ヒューズが主回路用の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
路用の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, in the invention according to claim (2), the thermal fuse for the operating circuit operates before the thermal fuse for the main circuit to prevent overheating, so when replacing the thermal fuse, the thermal fuse for the operating circuit operates before the thermal fuse for the main circuit. Only replacement is required, and repair work efficiency can be improved.
（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、主回路用の小容量の多
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。(Effect of the invention) As explained above, in the invention according to claim (1) of the present application, since a thermal fuse is arranged in each of the operating circuit and the main circuit of the electric heater, the electric current is also applied when the contacts of the contactor are welded. Overheating of the heater can be prevented, and a large number of small-capacity thermal fuses for the main circuit can be easily installed with less man-hours.
特に、請求項（′２Ｊに係る発明では、電気ヒータの過
熱の防止後の修理作業時には、操作回路用の温度ヒュー
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。Particularly, in the invention according to claim '2J, during repair work after preventing overheating of the electric heater, only the thermal fuse for the operation circuit needs to be replaced, so that 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) Embodiments of the present invention will be described below 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 an overheating prevention device for an electric heater device according to the present invention. In the figure, (1) is a three-phase electric heater, (2) is a Y-connected electric heater (1), and three-phase AC is supplied from the R phase, S phase, and T phase 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） ． （５２＋１−８＞ ， （
５２＋１−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。(52H) is a contact (52H-R) provided in each phase of the main circuit (2). (52+1-8> , (
52+1-T) to control energization to the electric heater (1) and operate the electric heater (1) when the contactor is closed; (52F) is a contactor for the blower fan provided in the electric heater (1); It's a relay.
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（５２１！
）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
（２１ｍＡＩ＋）と、訓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（フ）には並列に上記送風ファン用リレー（５２
Ｆ）の自己保持接点＜５２１’−１）が接続されている
。また、上記接触器（５２１１）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
＜５２１１＞ （７）接点（５２１１−Ｒ） ． （５
２Ｈ−８） ． （５２１１−Ｔ）を開動作させて、電
気ヒータ（１）の通電を停止させる。Furthermore, in (5), the contactor (52H) and the blower fan relay (52F> are connected in parallel, and power is supplied to these from two phases, the R phase and the S phase of the three-phase power supply, and the contactor (521!) is connected in parallel.
). The operation circuit (5) includes:
An automatic reset type overheat protector (21mAI+) for the electric heater (1), a stop button (6) to be operated, and a run button (7) to be closed are interposed. ) is connected in parallel with the above blower fan relay (52
F) self-holding contact <521'-1) is connected. Also, on the contactor (5211) side, an electric heater (
A temperature regulator (23A) is interposed to adjust the temperature of 1), and when the temperature regulator (23A) is opened, the contactor <5211> (7) contact (5211-R) . (5
2H-8). (5211-T) is opened to stop the electric heater (1) from being energized.
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（ＩＯ）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（２ＢＡＩ１）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。Therefore, in the main circuit (2), a thermal fuse (IO) with a rated capacity matching the capacity of the electric heater (1) is connected to the R of the power supply.
It is arranged in phase and S phase. This thermal fuse (10
) is specifically used by connecting a large number of small capacity thermal fuses in parallel. On the other hand, the operation circuit (5) has a small capacity thermal fuse (
11> are arranged.
上記操作回路用の温度ヒュ〜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ＨＱに設定される。また、上記過熱防止
器（２ＢＡＩ＋）の動作温度ＩＡＩ−１と、主回路用温
度ヒューズ（ｌＯ）の動作温度ＨＭと、操作回路用温度
ヒューズ（ＩＩ）の動作温度ＨＡとの関係は下記式の通
りであり、
ＨＡ Ｈ ＜ＨＡ ＜ＨＭ
操作回路用温度ヒューズ（ｌ１）の動作温度ＨＡは、主
回路用温度ヒューズ（１ｏ）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ＨＡ｝Ｉ−８０”
、ＨＡ−１１０゜、ＨＭ−１３０’ テある。Operating temperature HA of the temperature fuse (11) for the above operation circuit
is set to the upper limit outer shell temperature HQ around the electric heater device regulated by the Electrical Appliance and Material Control Law. In addition, the relationship between the operating temperature IAI-1 of the overheat protector (2BAI+), the operating temperature HM of the main circuit thermal fuse (lO), and the operating temperature HA of the operating circuit thermal fuse (II) is expressed by the following formula. HA H <HA <HM The operating temperature HA of the operation circuit thermal fuse (11) is set lower than the operating temperature HM of the main circuit thermal fuse (1o). Specifically, for example, HA}I-80''
, HA-110°, HM-130'.
したがって、上記実施例においては、過熱防止器（２Ｇ
ＡＩ＋）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（５２１１）の接点（５２１１−Ｒ）
． （５２１＋−Ｓ） ， （５２１１−Ｔ）が開動
作して電気ヒータ（ｌ）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 desuperheater (2G
When the electric heater (1) overheats due to a failure of AI+),
By the time the outer shell temperature around the electric heater device reaches the standard value Ho, the operation circuit thermal fuse (11) is blown, which causes the contact (5211-R) of the contactor (5211) to open.
．． (521+-S) and (5211-T) are opened to prevent the electric heater (l) from being energized, thereby preventing further overheating.
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、操作回路用の温度ヒューズ（１１）
が担うので、主回路用の温度ヒューズ（１Ｇ）の動作温
度ＨＭを上記゛操作回路用温度ヒューズ（ｌ１）の動作
温度ＨＡ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、
操作回路用の温度ヒューズ（１１）のみを交換すればよ
いので、修理作業性が良い。Here, the function to keep the air temperature around the electric heater device below the standard value HO is the temperature fuse (11) for the operation circuit.
Therefore, there is no problem even if the operating temperature HM of the main circuit thermal fuse (1G) is set higher than the operating temperature HA of the operating circuit thermal fuse (l1), and this results in The degree of freedom in the mounting position of a large number of small capacity thermal fuses (10) is increased, the number of man-hours for mounting them is greatly reduced, and the mounting can be performed easily. Moreover, when replacing the thermal fuse after overheating prevention,
Since only the thermal fuse (11) for the operating circuit needs to be replaced, repair work is easy.
また、接触器（５２１１）の接点（５２１１−Ｒ） ．
（５２１１−９） ． （５２トＴ）が溶着している
場合には、過熱防止器（２０Ａ｝１）や操作回路用の温
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、主回路用の温度ヒューズ（ＩＯ）
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
。Also, the contact (5211-R) of the contactor (5211).
(5211-9) . (52T) is welded, the electric heater (1) will continue to be energized even if the overheat protector (20A}1) or the operating circuit thermal fuse (11) operates. , thermal fuse (IO) for main circuit
The main circuit (2) is cut off by the operation of the electric heater (1).
), it is possible to prevent further overheating of the electric heater (1) and improve safety.
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、（５２
１０・・・接触器、（５２１−Ｒ） ． （５２１１−
８） ， （５２１１−Ｔ）・・・接点、（５）・・・
操作回路、（１０）・・・主回路用温度ヒューズ、（１
ｌ）・・・操作回路用温度ヒューズ。
ほか２名
（１）・・・電気ヒータ
（２）・・・主回路
（５２８）・・・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第１FIG. 1 is an electrical circuit diagram showing the overall configuration of the present invention. (1)... Electric heater, (2)... Main circuit, (52
10... Contactor, (521-R). (5211-
8) , (5211-T)...Contact, (5)...
Operation circuit, (10)...Main circuit thermal fuse, (1
l)...Thermal fuse for operating circuit. 2 other people (1)... Electric heater (2)... Main circuit (528)... Contactor (52H-R), (52H-S). (52H-
T)...Contact (5)...Operating circuit (10)...Thermal fuse for main circuit (11)...Thermal fuse 1 for operating circuit
Claims (2)
操作回路と、上記接触器により電気ヒータを作動させる
主回路とを備えた電気ヒータ装置において、上記操作回
路に配置される小容量の操作回路用温度ヒューズと、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を有することを特徴とする電気ヒ
ータ装置の過熱防止装置。(1) In an electric heater device comprising an operation circuit for operating a contactor that controls energization to the electric heater, and a main circuit for operating the electric heater by the contactor, a small-capacity An overheating prevention device for an electric heater device, comprising: a thermal fuse for an operating circuit; and a thermal fuse for the main circuit, which is arranged in the main circuit and matches the capacity of the electric heater.
路用温度ヒューズの動作温度よりも低く設定されている
請求項（１）記載の電気ヒータ装置の過熱防止装置。(2) The overheat prevention device for an electric heater device according to claim (1), wherein the operational circuit thermal fuse has an operating temperature set lower than the operating temperature of the main circuit thermal fuse.
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 true JPH02234378A (en) | 1990-09-17 |
| JP2870789B2 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) |
Cited By (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
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2870789B2 (en) | 1999-03-17 |
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