JPH0311548Y2 - - Google Patents
Info
- Publication number
- JPH0311548Y2 JPH0311548Y2 JP1983184306U JP18430683U JPH0311548Y2 JP H0311548 Y2 JPH0311548 Y2 JP H0311548Y2 JP 1983184306 U JP1983184306 U JP 1983184306U JP 18430683 U JP18430683 U JP 18430683U JP H0311548 Y2 JPH0311548 Y2 JP H0311548Y2
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- positive electrode
- thermocouple
- welded
- length
- 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
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 229910001006 Constantan Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
Landscapes
- Control Of Combustion (AREA)
Description
【考案の詳細な説明】
本考案は熱電対を用いたガス器具等の炎の検出
装置に関するものである。[Detailed Description of the Invention] The present invention relates to a flame detection device for gas appliances, etc., using a thermocouple.
従来の装置は第１，２図のように鉄を主成分と
した耐熱合金の正電極１、コンスタンタンからな
る負電極２の各一端を溶接して熱電対の熱接点Ａ
を構成し、正電極１の他端には冷接点の冷却及び
電気抵抗を小さくするために黄銅の円筒３を溶接
し、さらに円筒３には銅のアース線４を溶接し、
負電極２の他端には電気抵抗を小さくするために
銅のリード線５を溶接して冷接点Ｂを構成し、円
筒３の一端を支持金具６で支持し、又円筒３の他
端を支持金具６の穴に貫通させ全体を固定してい
た。こうした構成によつてアース線４，リード線
５間に発生する熱起電力の着火、失火応答は第３
図に示すように、熱接点Ａと冷接点Ｂの温度差に
よつて出力電圧Voutが発生する。この種の安全
装置では不測の事故による失火後の生ガスの放出
時間を短かくするために、出力電圧Voutが失火
後速やかに電磁弁の離脱電圧に至ることが望まし
い。また、点火時には点火後速やかに電磁弁の吸
着電圧に至ることが操作上望ましいものである。
しかるに従来の構成では点火時の電磁弁吸着まで
の時間が２秒前後、失火時の電磁弁離脱までの時
間が40秒前後必要であり、操作性向上のために電
磁弁のコイルの線径を太くするか、巻数を増す等
によつて電磁弁の吸着電圧を減少させて点火応答
時間の短縮を計ると必然的に離脱電圧が減少して
失火応答時間が著しく増大し危険性の増大する欠
点があつた。 As shown in Figures 1 and 2, the conventional device welds one end of each of a positive electrode 1 made of a heat-resistant alloy mainly composed of iron and a negative electrode 2 made of constantan to form a hot junction A of a thermocouple.
A brass cylinder 3 is welded to the other end of the positive electrode 1 to cool the cold junction and to reduce electrical resistance, and a copper ground wire 4 is welded to the cylinder 3.
A copper lead wire 5 is welded to the other end of the negative electrode 2 to reduce electrical resistance to form a cold junction B, one end of the cylinder 3 is supported by a support fitting 6, and the other end of the cylinder 3 is It was passed through the hole of the support fitting 6 and the whole was fixed. With this configuration, the ignition and misfire response of the thermoelectromotive force generated between the ground wire 4 and the lead wire 5 are
As shown in the figure, the output voltage Vout is generated due to the temperature difference between the hot junction A and the cold junction B. In this type of safety device, in order to shorten the time for releasing raw gas after a misfire due to an unexpected accident, it is desirable that the output voltage Vout quickly reach the withdrawal voltage of the solenoid valve after a misfire. Further, during ignition, it is desirable for operation to reach the attraction voltage of the solenoid valve immediately after ignition.
However, with the conventional configuration, it takes about 2 seconds for the solenoid valve to attract when igniting, and about 40 seconds for the solenoid valve to detach when there is a misfire.To improve operability, the wire diameter of the solenoid valve coil has to be If you try to shorten the ignition response time by reducing the attraction voltage of the solenoid valve by making it thicker or increasing the number of turns, the disconnection voltage will inevitably decrease, which will significantly increase the misfire response time and increase the risk. It was hot.
本考案は前記の欠点を除くためになされたもの
で、その目的は、点火、失火応答特性を向上さ
せ、且つ簡単な構造の炎の検出装置を提供するに
ある。そのために負電極の長さを10mm〜15mmと
し、さらに熱接点の先端部から14mm以下の位置に
放熱板を溶接する構造としたものである。 The present invention has been made to eliminate the above-mentioned drawbacks, and its purpose is to provide a flame detection device that improves ignition and misfire response characteristics and has a simple structure. For this purpose, the length of the negative electrode is set to 10 mm to 15 mm, and a heat sink is welded to a position 14 mm or less from the tip of the hot junction.
以下本考案の一実施例を第４図、第５図によつ
て説明する。第４図、第５図において鉄を主成分
とした耐熱合金の中空の円すい状の正電極１、コ
ンスタンタンからなる長さL1が10mm〜15mmの負
電極２の各一端を溶接して熱電対の熱接点Ａと
し、負電極２の他端には電気抵抗を小さくするた
めに銅のリード線５を溶接して冷接点Ｂを構成し
ている。また、冷却点Ｂは正電極１の中空部内に
位置するようにしてある。正電極１を断面クラン
ク形に形成した放熱板７に設けた穴部８に貫通さ
せて、正電極１と穴部８との接合部を溶接すると
ともに放熱板７には銅のアース線４を溶接してあ
る。正電極１と放熱板７の穴部８との溶接部は熱
接点Ａの先端部からの距離L2が14mm以下となる
位置に位置させ、放熱板７をを支持金具と供用に
してある。 An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. In Figures 4 and 5, a hollow conical positive electrode 1 made of a heat-resistant alloy mainly composed of iron, and a negative electrode 2 made of constantan with a length L 1 of 10 mm to 15 mm are welded at one end to form a thermocouple. A hot junction A is formed, and a cold junction B is formed by welding a copper lead wire 5 to the other end of the negative electrode 2 to reduce electrical resistance. Further, the cooling point B is located within the hollow portion of the positive electrode 1. The positive electrode 1 is passed through a hole 8 provided in a heat sink 7 having a crank-shaped cross section, and the joint between the positive electrode 1 and the hole 8 is welded, and a copper ground wire 4 is connected to the heat sink 7. It's welded. The welded portion between the positive electrode 1 and the hole 8 of the heat sink 7 is located at a distance L2 from the tip of the thermal contact A of 14 mm or less, so that the heat sink 7 is used as a supporting metal fitting.
次に上記構成による作用について説明する。熱
電対の頭部を炎で加熱する熱接点Ａの温度は急激
に上昇するが冷接点Ｂの温度は、放熱板によつて
熱の伝達がさえぎられるために熱接点Ａの温度よ
り遅れて上昇する。第８図は上記したようにコン
スタンタンからなる負電極２と鉄を主成分とした
耐熱合金の中空の円すい状の正電極１の一端を溶
接して熱電体の熱接点Ａとし、負電極２の他端は
銅等の電気抵抗の小さい金属のリード線５を溶接
して冷接点Ｂを構成し、クランク状に形成した放
熱板７に設けた穴部に貫通させた正電極１を溶接
したときのデータである。これによれば負電極２
の長さL1が10〜15mmの時冷接点Ｂと熱接点Ａと
の温度差が点火に都合のよい大きさになるため点
火応答性は向上する。その後冷接点Ｂと熱接点Ａ
は熱的平衡に達し、出力電圧を平状態になる。次
に炎が吹き消えた場合には熱接点Ａは放熱板７の
放熱によつて急激に冷却し、冷接点Ｂは正電極１
の中空の円すい部の保温効果によつて冷却速度が
抑えられるため、出力電圧Voutは急激に下降す
るが、第６，７図に示す如く放熱板７の熱接点Ａ
からの距離L2を14mm以下とした時に負電極２の
長さL110〜15mmの時の失火応答時間が向上する。 Next, the effect of the above configuration will be explained. The temperature of hot junction A, which heats the head of the thermocouple with flame, rises rapidly, but the temperature of cold junction B rises later than the temperature of hot junction A because the heat transfer is blocked by the heat sink. do. FIG. 8 shows, as mentioned above, one end of the negative electrode 2 made of constantan and the hollow conical positive electrode 1 of a heat-resistant alloy mainly composed of iron are welded to form the thermal junction A of the thermoelectric body. When the other end is welded with a lead wire 5 made of a metal with low electrical resistance such as copper to form a cold junction B, and a positive electrode 1 is welded through the hole provided in the crank-shaped heat dissipation plate 7. This is the data. According to this, negative electrode 2
When the length L1 is 10 to 15 mm, the temperature difference between the cold junction B and the hot junction A becomes large enough to be convenient for ignition, so the ignition response improves. Then cold junction B and hot junction A
reaches thermal equilibrium and the output voltage levels out. Next, when the flame is blown out, the hot junction A is rapidly cooled down by the heat dissipation of the heat sink 7, and the cold junction B is connected to the positive electrode 1.
Since the cooling rate is suppressed by the heat retention effect of the hollow conical part, the output voltage Vout drops rapidly, but as shown in FIGS.
When the distance L 2 from the negative electrode 2 is set to 14 mm or less, the misfire response time when the length L 1 of the negative electrode 2 is 10 to 15 mm is improved.
尚今までは熱電対とバーナの位置を固定して述
べたが、放熱板７の熱接点位置Ａからの距離L2
を14mm以下とした時には極端に放熱が良くなる。
また逆に熱接点温度を従来品と同じになるように
熱電対の位置をバーナに近づけた場合には、点火
応答時間が0.5秒程度となり、極端に向上する。
従つて、14mm以下は特異点となる。 Up to now, the positions of the thermocouple and burner have been fixed, but the distance L 2 from the thermal contact point A of the heat sink 7
When it is set to 14mm or less, heat dissipation becomes extremely good.
On the other hand, if the thermocouple is moved closer to the burner so that the hot junction temperature is the same as the conventional product, the ignition response time will be about 0.5 seconds, which is an extreme improvement.
Therefore, 14 mm or less becomes a singular point.
以上、本考案によれば、正電極の中空部内に構
成した冷接点に係わる負電極の長さを10〜15mmと
したことにより点火応答性が向上するので操作性
を向上させることが出来、又放熱板の正電極への
取付位置を熱接点から14mm以下としたことにより
失火応答性が向上するので安全性が向上し、且つ
放熱板を支持金具共用にし、円筒を省くことが出
来るようになつたので、部品点数も削減し、構造
も簡単な炎の検出装置を提供出来るものである。 As described above, according to the present invention, by setting the length of the negative electrode related to the cold junction formed in the hollow part of the positive electrode to 10 to 15 mm, the ignition response is improved, so the operability can be improved. By setting the mounting position of the heat sink to the positive electrode at 14 mm or less from the hot junction, misfire response is improved, which improves safety, and the heat sink can also be used as a support bracket, eliminating the need for a cylinder. Therefore, it is possible to provide a flame detection device with a reduced number of parts and a simple structure.
第１図及び第２図は従来の炎の検出装置の斜視
図及び断面図、第３図は同じく冷熱両接点温度と
出力電圧に係わる点火、失火応答特性図、第４図
及び第５図は本考案の一実施例による炎の検出装
置の斜視図及び断面図、第６図及び第７図は同じ
く放熱板の取付位置、負電極の長さと失火応答時
間に係わる特性図、第８図は同じく負電極の長さ
と点火応答時間に係わる特性図である。
１……正電極、２……負電極、７……放熱板
７。
Figures 1 and 2 are a perspective view and a sectional view of a conventional flame detection device, Figure 3 is a diagram of ignition and misfire response characteristics related to both cold and hot junction temperatures and output voltage, and Figures 4 and 5 are A perspective view and a sectional view of a flame detection device according to an embodiment of the present invention, FIGS. 6 and 7 are characteristic diagrams related to the mounting position of the heat sink, the length of the negative electrode and the misfire response time, and FIG. It is a characteristic diagram relating to the length of the negative electrode and the ignition response time. 1... Positive electrode, 2... Negative electrode, 7... Heat sink 7.
Claims (1)
電極２と、負電極２より長い鉄分を主成分とした
耐熱合金の中空の円すい状正電極１と、正電極１
と負電極２の各一端を溶接してなる熱電対の熱接
点と、この熱接点の先端部から14mm以下で、かつ
負電極２の長さより短い位置に溶接され、熱電対
の支持金具を共用した放熱板７とからなる炎の検
出装置。 A negative electrode 2 made of constantan and having a length of 10 mm to 15 mm, a hollow conical positive electrode 1 of a heat-resistant alloy mainly composed of iron, which is longer than the negative electrode 2, and a positive electrode 1
and a thermocouple thermal junction formed by welding one end of each of the negative electrode 2, and a thermocouple welded at a position 14 mm or less from the tip of this hot junction and shorter than the length of the negative electrode 2, and sharing the thermocouple support fittings. A flame detection device consisting of a heat dissipation plate 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18430683U JPS6091943U (en) | 1983-11-29 | 1983-11-29 | flame detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18430683U JPS6091943U (en) | 1983-11-29 | 1983-11-29 | flame detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6091943U JPS6091943U (en) | 1985-06-24 |
| JPH0311548Y2 true JPH0311548Y2 (en) | 1991-03-20 |
Family
ID=30398658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18430683U Granted JPS6091943U (en) | 1983-11-29 | 1983-11-29 | flame detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6091943U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08193573A (en) * | 1995-01-17 | 1996-07-30 | Tel Varian Ltd | Safety valve device of cryo pump |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4831338U (en) * | 1971-08-11 | 1973-04-17 | ||
| JPS5473334A (en) * | 1977-11-24 | 1979-06-12 | Inoue Japax Res Inc | Safety valve for gas appliance |
-
1983
- 1983-11-29 JP JP18430683U patent/JPS6091943U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4831338U (en) * | 1971-08-11 | 1973-04-17 | ||
| JPS5473334A (en) * | 1977-11-24 | 1979-06-12 | Inoue Japax Res Inc | Safety valve for gas appliance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08193573A (en) * | 1995-01-17 | 1996-07-30 | Tel Varian Ltd | Safety valve device of cryo pump |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6091943U (en) | 1985-06-24 |
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