JP2007087740A - Sheathed heater - Google Patents

Sheathed heater Download PDF

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Publication number
JP2007087740A
JP2007087740A JP2005274435A JP2005274435A JP2007087740A JP 2007087740 A JP2007087740 A JP 2007087740A JP 2005274435 A JP2005274435 A JP 2005274435A JP 2005274435 A JP2005274435 A JP 2005274435A JP 2007087740 A JP2007087740 A JP 2007087740A
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Japan
Prior art keywords
metal pipe
conical
sheathed heater
welding
flange
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Japanese (ja)
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Atsushi Suzuki
淳 鈴木
Mitsutaka Takahashi
光孝 高橋
Kazuhiro Miya
一普 宮
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to JP2005274435A priority Critical patent/JP2007087740A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain a sheathed heater with high reliability hardly generating gap corrosion, by avoiding micro gaps at a welding part of a metal pipe and a burring part of a flange stuffed with vapor. <P>SOLUTION: The sheathed heater is provided with a metal pipe 1 having a heating wire built-in, a flange 2 with the metal pipe inserted into its burring part 6, and a welding part 11 welding and jointing the metal pipe and a tip part 6a of the conical burring part of the flange. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、電気温水器等に用いるシーズヒータに関し、特に、その溶接構造に関するものである。   The present invention relates to a sheathed heater used in an electric water heater or the like, and more particularly to a welded structure thereof.

従来のフランジ付シーズヒータは、フランジに形成した円筒状のバーリング部のフランジ面に平行な先端面と、このバーリング部に挿入したシーズヒータの金属パイプのフランジ面に平行な薄肉の先端面とを略面一にそろえ、両先端面をＴＩＧ溶接法により溶接接合していた（例えば、特許文献１参照）。   The conventional flanged sheathed heater has a tip end surface parallel to the flange surface of the cylindrical burring portion formed on the flange and a thin tip end surface parallel to the flange surface of the metal pipe of the sheathed heater inserted into the burring portion. The both end surfaces were welded and joined together by the TIG welding method (see, for example, Patent Document 1).

特開昭５８−０６４７８９号公報Japanese Patent Laid-Open No. 58-064789

しかしながら、上記従来の技術によれば、金属パイプとフランジの円筒状のバーリング部との嵌合部分に嵌合公差に相当する微細な隙間が存在し、また、バーリング部の先端面と金属パイプの先端面とは平行で略面一であるので、ＴＩＧ溶接による溶融金属が微細な隙間に流れ込み難く、溶接後に微細な隙間が残り、この隙間に水が入り込んで篭り、隙間腐食を発生させ、水漏れの原因となるという問題があった。   However, according to the above conventional technique, there is a minute gap corresponding to the fitting tolerance in the fitting portion between the metal pipe and the cylindrical burring portion of the flange, and the tip surface of the burring portion and the metal pipe Since it is parallel to the tip surface and substantially flush, molten metal by TIG welding is difficult to flow into the fine gap, and a fine gap remains after welding. There was a problem of causing leakage.

本発明は、上記に鑑みてなされたものであって、金属パイプとフランジのバーリング部との溶接部に水が篭るような微細な隙間を作らないようにし、隙間腐食が発生し難く信頼性の高いシーズヒータを得ることを目的とする。   The present invention has been made in view of the above, and prevents the formation of minute gaps such that water spills in the welded portion between the metal pipe and the burring portion of the flange, and crevice corrosion hardly occurs. The purpose is to obtain a high sheathed heater.

上述した課題を解決し、目的を達成するために、本発明は、発熱線を内蔵した金属パイプと、所定の円錐角を有する円錐状バーリング部が形成され、該円錐状バーリング部に前記金属パイプが挿通されたフランジと、前記金属パイプと前記フランジの円錐状バーリング部の先端部とを溶接接合した溶接部と、を備えることを特徴とする。   In order to solve the above-described problems and achieve the object, the present invention provides a metal pipe having a heating wire and a conical burring portion having a predetermined cone angle, and the metal pipe is formed in the conical burring portion. And a welded portion obtained by welding and joining the metal pipe and the tip of the conical burring portion of the flange.

この発明によれば、フランジに所定の円錐角を有する円錐状バーリング部が形成されているので、金属パイプと円錐状バーリング部との間には、水が篭るような微細な隙間は形成されず、隙間腐食が発生し難いシーズヒータが得られる、という効果を奏する。   According to the present invention, since the conical burring portion having a predetermined cone angle is formed on the flange, there is no fine gap between the metal pipe and the conical burring portion that causes water to flow. There is an effect that a sheathed heater in which crevice corrosion hardly occurs can be obtained.

以下に、本発明にかかるシーズヒータの実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。   Embodiments of a sheathed heater according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

実施の形態１．
図１−１は、本発明にかかるシーズヒータの実施の形態１を示す一部破断正面図であり、図１−２は、図１−１のＡ部拡大図であり、図１−３は、実施の形態１のシーズヒータの変形例を示す溶接部の溶接前の断面図であり、図１−４は、同溶接後の断面図である。 Embodiment 1 FIG.
1-1 is a partially broken front view showing a first embodiment of a sheathed heater according to the present invention, FIG. 1-2 is an enlarged view of a portion A in FIG. 1-1, and FIG. FIG. 4 is a cross-sectional view of the welded portion before welding showing a modification of the sheathed heater of the first embodiment, and FIG. 1-4 is a cross-sectional view after the welding.

図１−１及び図１−２に示すように、実施の形態１のシーズヒータ１００は、発熱線４を内蔵し、Ｕ字状に折り曲げられた金属パイプ１と、２つの円錐状バーリング部６、６が形成され、２つの円錐状バーリング部６、６に金属パイプ１の両端部が挿通されたフランジ２と、を備えている。   As shown in FIGS. 1-1 and 1-2, the sheathed heater 100 according to the first embodiment includes a heat generating wire 4, a metal pipe 1 bent into a U shape, and two conical burring portions 6. , 6 are formed, and two conical burring portions 6, 6 are provided with a flange 2 into which both ends of the metal pipe 1 are inserted.

金属パイプ１の両先端部１ａ、１ａには、電源入力端となる端子棒３、３が、略１／５の長さの外端部を金属パイプ１の両先端部１ａ、１ａから突出させ、略４／５の長さの本体部を金属パイプ１内に挿入させ、絶縁封止材８により固定されている。端子棒３、３の本体部には、発熱線４が接続されている。金属パイプ１内には、絶縁粉末材５が封入され、発熱線４と金属パイプ１とを絶縁している。   At both ends 1a and 1a of the metal pipe 1, terminal rods 3 and 3 serving as power input ends are projected from the both ends 1a and 1a of the metal pipe 1 with outer ends having a length of about 1/5. The main body having a length of about 4/5 is inserted into the metal pipe 1 and fixed by the insulating sealing material 8. A heating wire 4 is connected to the main body of the terminal rods 3 and 3. An insulating powder material 5 is enclosed in the metal pipe 1 to insulate the heating wire 4 from the metal pipe 1.

金属パイプ１のＵ字状折り曲げ部を図示しない電気温水器の温水タンク内に位置させてフランジ２を温水タンクに取り付け、発熱線４に通電して温水タンク内の水を加熱する。   The U-shaped bent part of the metal pipe 1 is positioned in a hot water tank of an electric water heater (not shown), the flange 2 is attached to the hot water tank, and the heating wire 4 is energized to heat the water in the hot water tank.

図１−２に示すように、円錐状バーリング部６は、フランジ２に下孔を開け、所定の円錐角を有するテーパ形バーリングパンチを下孔に押し込むことにより、下孔の縁を広げながら塑性変形させ、所定の円錐角Ｘの円錐（テーパ）状に形成される。   As shown in FIG. 1-2, the conical burring portion 6 is made of plastic while expanding the edge of the lower hole by opening a lower hole in the flange 2 and pushing a tapered burring punch having a predetermined cone angle into the lower hole. It is deformed and formed into a cone (taper) shape with a predetermined cone angle X.

実施の形態１のシーズヒータ１００では、円錐状バーリング部６の先端部６ａの内側エッジ部６ｃが、金属パイプ１の外周部にリング状に線接触するように、円錐状バーリング部６が形成されている。円錐状バーリング部６の円錐角Ｘは、１５°〜３５°とするのがよい。   In the sheathed heater 100 of the first embodiment, the conical burring portion 6 is formed such that the inner edge portion 6c of the tip portion 6a of the conical burring portion 6 is in line contact with the outer peripheral portion of the metal pipe 1 in a ring shape. ing. The cone angle X of the conical burring portion 6 is preferably 15 ° to 35 °.

図１−２に示すように、円錐状バーリング部６の先端面６ｂは、テーパ形バーリングパンチによる押し込み加工により、下孔加工時の円柱面が押し広げられて、円錐面状に形成される。先端面６ｂの円錐角Ｙは、円錐角Ｘの余角となっていて、円錐角Ｘが、１５°〜３５°のとき、円錐角Ｙは、略７５°〜５５°となる。   As shown in FIG. 1-2, the front end surface 6b of the conical burring portion 6 is formed in a conical surface shape by a cylindrical surface during the preparation of the lower hole being expanded by a pressing process using a tapered burring punch. The cone angle Y of the distal end surface 6b is a remainder angle of the cone angle X. When the cone angle X is 15 ° to 35 °, the cone angle Y is approximately 75 ° to 55 °.

円錐面状に形成された円錐状バーリング部６の先端面６ｂと金属パイプ１の円筒面とは、溶接種類でいう「レ形グルーブ溶接の開先」を形成しているので、この開先形状を利用して、金属パイプ１とフランジ２とをアーク溶接、ガス溶接又はＴＩＧ溶接等により連続溶接し、リング状の溶接部１１を形成する。   The tip surface 6b of the conical burring portion 6 formed in the shape of a conical surface and the cylindrical surface of the metal pipe 1 form a “groove of the groove-shaped groove welding” referred to as a welding type. , The metal pipe 1 and the flange 2 are continuously welded by arc welding, gas welding, TIG welding or the like to form a ring-shaped welded portion 11.

実施の形態１のシーズヒータ１００は、フランジ２に所定の円錐角を有する円錐状バーリング部６が形成されているので、従来技術の円筒状バーリング部に比べ、金属パイプと円錐状バーリング部との間には、水が篭るような微細な隙間は形成されず、隙間腐食が発生し難い。   In the sheathed heater 100 of the first embodiment, the conical burring portion 6 having a predetermined conical angle is formed on the flange 2, so that the metal pipe and the conical burring portion are less than the conventional cylindrical burring portion. In the meantime, no minute gaps are formed such that water crawls, and crevice corrosion hardly occurs.

また、円錐状バーリング部６は、円筒状バーリング部に比べ、裾野が広くフランジ２の曲げ剛性が高くなり、金属パイプ１の支持強度が高くなるという利点がある。特に、円錐角Ｘを１５°〜３５°とすると、この効果が大きい。また、「レ形グルーブ溶接の開先」が形成されているので、レ形グルーブを利用して溶接作業を合理的に行なうことができ、信頼性の高い溶接部１１が得られる。   Further, the conical burring portion 6 has an advantage that the base is wide and the bending rigidity of the flange 2 is increased and the supporting strength of the metal pipe 1 is increased as compared with the cylindrical burring portion. In particular, when the cone angle X is 15 ° to 35 °, this effect is great. In addition, since the “groove of the re-shaped groove welding” is formed, the welding work can be rationally performed using the re-shaped groove, and a highly reliable welded portion 11 is obtained.

次に、図１−３及び図１−４を参照して、実施の形態１のシーズヒータ１００の変形例について説明する。図１−３は、実施の形態１のシーズヒータの変形例を示す溶接部の溶接前の断面図であり、図１−４は、同溶接後の断面図である。   Next, with reference to FIGS. 1-3 and FIGS. 1-4, the modification of the sheathed heater 100 of Embodiment 1 is demonstrated. 1-3 is sectional drawing before welding of the welding part which shows the modification of the sheathed heater of Embodiment 1, and FIGS. 1-4 are sectional drawings after the welding.

変形例のシーズヒータ１００は、金属パイプ１の先端部（先端面）１ａとフランジ２の円錐状バーリングブ６の先端面６ｂとが略面一に揃えられている。円錐面状に形成された円錐状バーリング部６の先端面６ｂと金属パイプ１の先端面１ａとは、溶接種類でいう「Ｖ形グルーブ溶接の開先」を形成しているので、この開先形状を利用して、金属パイプ１とフランジ２とをアーク溶接、ガス溶接又はＴＩＧ溶接等により連続溶接し、リング状の溶接部１１を形成する。他の部分は、図１−１及び図１−２に示すシーズヒータ１００と同等であるので、その構造の詳細な説明は省略する。   In the sheathed heater 100 of the modified example, the tip end portion (tip end surface) 1 a of the metal pipe 1 and the tip end surface 6 b of the conical burring groove 6 of the flange 2 are substantially flush with each other. The tip surface 6b of the conical burring portion 6 formed in a conical surface shape and the tip surface 1a of the metal pipe 1 form a "V-shaped groove welding groove" as a welding type. Using the shape, the metal pipe 1 and the flange 2 are continuously welded by arc welding, gas welding, TIG welding, or the like to form a ring-shaped welded portion 11. Other parts are the same as those of the sheathed heater 100 shown in FIGS. 1-1 and 1-2, and thus detailed description of the structure is omitted.

変形例のシーズヒータ１００は、フランジ２に所定の円錐角を有する円錐状バーリング部６が形成されているので、従来技術の円筒状バーリング部に比べ、金属パイプと円錐状バーリング部との間には、水が篭るような微細な隙間は形成されず、隙間腐食が発生し難い。また、円錐状バーリング部６は、円筒状バーリング部に比べ、裾野が広くフランジ２の曲げ剛性が高くなり、金属パイプ１の支持強度が高くなるという利点がある。また、「Ｖ形グルーブ溶接の開先」が形成されているので、溶接作業を合理的に行なうことができ、信頼性の高い溶接部１１が得られる。   In the sheathed heater 100 of the modified example, the conical burring portion 6 having a predetermined conical angle is formed on the flange 2, so that the space between the metal pipe and the conical burring portion is smaller than that of the conventional cylindrical burring portion. Does not form fine gaps that cause water to swell, and crevice corrosion is unlikely to occur. Further, the conical burring portion 6 has an advantage that the base is wide and the bending rigidity of the flange 2 is increased and the supporting strength of the metal pipe 1 is increased as compared with the cylindrical burring portion. Moreover, since the “groove for V-shaped groove welding” is formed, the welding operation can be performed rationally, and a highly reliable welded portion 11 is obtained.

実施の形態２．
次に、図２−１〜図２−３を参照して、実施の形態２のシーズヒータ２００について説明する。図２−１は、実施の形態２のシーズヒータの溶接部の溶接前の断面図であり、図２−２は、図２−１のＢ方向矢視図であり、図２−３は、溶接部の溶接後の断面図である。 Embodiment 2. FIG.
Next, a sheathed heater 200 according to the second embodiment will be described with reference to FIGS. 2A is a cross-sectional view of the welded portion of the sheathed heater according to the second embodiment before welding, FIG. 2B is a view in the direction of the arrow B in FIG. It is sectional drawing after welding of a welding part.

実施の形態２のシーズヒータ２００では、円錐状バーリング部６の先端部の内側エッジ部６ｃと金属パイプ１の外周部との間に、０．１ｍｍ〜１ｍｍの均一な隙間が設けられている。図２−２に示すように、円錐状バーリング部６の先端部には、金属パイプ１に接触して前記の隙間を均一にするための３ヶ所以上の位置決め突起７が設けられている。   In the sheathed heater 200 of the second embodiment, a uniform gap of 0.1 mm to 1 mm is provided between the inner edge portion 6 c at the tip of the conical burring portion 6 and the outer peripheral portion of the metal pipe 1. As shown in FIG. 2B, at the tip of the conical burring portion 6, there are provided three or more positioning projections 7 for contacting the metal pipe 1 and making the gap uniform.

図２−１に示すように、円錐状バーリング部６の先端面６ｂと金属パイプ１の円筒面とは、溶接種類でいう「ルート間隔０．１ｍｍ〜１ｍｍのレ形グルーブ溶接の開先」を形成しているので、この開先形状を利用して、金属パイプ１とフランジ２とをアーク溶接、ガス溶接又はＴＩＧ溶接等により溶接棒（溶加棒）１２で肉盛り溶接接合し、図２−３に示すように、リング状の溶接部１１を形成する。溶接作業時には、開先の裏側に裏当て金を当ててもよい。   As shown in FIG. 2A, the distal end surface 6b of the conical burring portion 6 and the cylindrical surface of the metal pipe 1 form a “groove of groove-shaped groove welding with a root interval of 0.1 mm to 1 mm” as a welding type. Since the groove shape is formed, the metal pipe 1 and the flange 2 are welded and joined with a welding rod (melting rod) 12 by arc welding, gas welding, TIG welding, or the like. As shown in -3, a ring-shaped weld 11 is formed. During the welding operation, a backing metal may be applied to the back side of the groove.

実施の形態２のシーズヒータ２００は、円錐状バーリング部６の先端部の内側エッジ部６ｃと金属パイプ１の外周部との間に、０．１ｍｍ〜１ｍｍの均一な隙間が設けられているので、実施の形態１の円錐状バーリング部に比べ、金属パイプ１と円錐状バーリング部６との間隔が大きくなり、水がさらに篭りにくくなり、隙間腐食がいっそう発生し難い。   In the sheathed heater 200 of the second embodiment, a uniform gap of 0.1 mm to 1 mm is provided between the inner edge portion 6 c at the tip of the conical burring portion 6 and the outer peripheral portion of the metal pipe 1. Compared to the conical burring portion of the first embodiment, the distance between the metal pipe 1 and the conical burring portion 6 is increased, water is less liable to sprinkle, and crevice corrosion is less likely to occur.

実施の形態３．
次に、図３を参照して、実施の形態３のシーズヒータ３００について説明する。図３は、実施の形態３のシーズヒータ３００を示す円錐状バーリング部の断面図である。 Embodiment 3 FIG.
Next, with reference to FIG. 3, the sheathed heater 300 of Embodiment 3 is demonstrated. FIG. 3 is a cross-sectional view of the conical burring portion showing the sheathed heater 300 of the third embodiment.

図３に示すように、実施の形態３のシーズヒータ３００は、金属パイプ１の先端部（先端面）１ａとフランジ２の円錐状バーリング部６の先端面６ｂとが略面一に揃えられ、金属パイプ１の先端部と円錐状バーリング部６の先端面とをアーク溶接、ガス溶接又はＴＩＧ溶接等により連続溶接し、リング状の溶接部１１を形成している。   As shown in FIG. 3, in the sheathed heater 300 according to the third embodiment, the tip end (tip end face) 1a of the metal pipe 1 and the tip end face 6b of the conical burring portion 6 of the flange 2 are substantially flush with each other. A ring-shaped weld 11 is formed by continuously welding the tip of the metal pipe 1 and the tip of the conical burring 6 by arc welding, gas welding, TIG welding, or the like.

金属パイプ１と円錐状バーリング部６との間の断面三角形のリング状空間６ｄに樹脂材料等の封止材２１を充填する。他の部分は、図１−３及び図１−４に示す変形例のシーズヒータ１００と同等であるので、その構造の詳細な説明は省略する。なお、フランジ２の金属パイプ１に対する溶接位置は、図１−１に示すように、金属パイプ１の先端部でなく中間位置であってもよい。   A sealing material 21 such as a resin material is filled in a ring-shaped space 6 d having a triangular cross section between the metal pipe 1 and the conical burring portion 6. The other parts are the same as those of the sheathed heater 100 of the modification shown in FIGS. 1-3 and 1-4, and detailed description of the structure is omitted. The welding position of the flange 2 with respect to the metal pipe 1 may be an intermediate position instead of the tip of the metal pipe 1 as shown in FIG.

実施の形態３のシーズヒータ３００は、金属パイプ１と円錐状バーリング部６との間の断面三角形のリング状空間６ｄに樹脂材料等の封止材２１を充填したので、リング状空間６ｄに水が侵入せず、溶接部１１にいっそう腐食が発生し難い。   In the sheathed heater 300 of the third embodiment, the ring-shaped space 6d between the metal pipe 1 and the conical burring portion 6 is filled with the sealing material 21 such as a resin material in the triangular cross-section, so that the ring-shaped space 6d is filled with water. Does not invade, and the weld 11 is less likely to corrode.

以上のように、本発明にかかるシーズヒータは、金属パイプとフランジとの溶接部に腐食が発生し難く、電気温水器用として有用である。   As described above, the sheathed heater according to the present invention is less susceptible to corrosion at the welded portion between the metal pipe and the flange, and is useful for an electric water heater.

本発明にかかるシーズヒータの実施の形態１を示す一部破断正面図である。It is a partially broken front view which shows Embodiment 1 of the sheathed heater concerning this invention. 図１−１のＡ部拡大図である。It is the A section enlarged view of FIGS. 1-1. 実施の形態１のシーズヒータの変形例を示す溶接部の溶接前の断面図である。It is sectional drawing before welding of the welding part which shows the modification of the sheathed heater of Embodiment 1. FIG. 同溶接後の断面図である。It is sectional drawing after the welding. 本発明の実施の形態２のシーズヒータの溶接部の溶接前の断面図である。It is sectional drawing before welding of the welding part of the sheathed heater of Embodiment 2 of this invention. 図２−１のＢ方向矢視図である。It is a B direction arrow directional view of FIGS. 溶接部の溶接後の断面図である。It is sectional drawing after welding of a welding part. 本発明の実施の形態３のシーズヒータを示す円錐状バーリング部の断面図である。It is sectional drawing of the conical burring part which shows the sheathed heater of Embodiment 3 of this invention.

符号の説明Explanation of symbols

１ 金属パイプ
１ａ 先端部
２ フランジ
３ 端子棒
４ 発熱線
５ 絶縁粉末剤
６ 円錐状バーリング部
６ａ 先端部
６ｂ 先端面
６ｃ 内側エッジ部
６ｄ リング状空間
７ 位置決め突起
８ 絶縁封止材
１１ 溶接部
１２ 溶接棒（溶加棒）
２１ 樹脂材料（封止材）
１００、２００、３００ シーズヒータ
Ｘ 円錐角
Ｙ 円錐角（円錐角Ｘの余角） DESCRIPTION OF SYMBOLS 1 Metal pipe 1a Tip part 2 Flange 3 Terminal rod 4 Heating wire 5 Insulating powder agent 6 Conical burring part 6a Tip part 6b Tip surface 6c Inner edge part 6d Ring-shaped space 7 Positioning protrusion 8 Insulation sealing material 11 Welding part 12 Welding Stick
21 Resin material (encapsulant)
100, 200, 300 Sheathed heater X Cone angle Y Cone angle (coil angle of cone angle X)

Claims (7)

発熱線を内蔵した金属パイプと、
所定の円錐角を有する円錐状バーリング部が形成され、該円錐状バーリング部に前記金属パイプが挿通されたフランジと、
前記金属パイプと前記フランジの円錐状バーリング部の先端部とを溶接接合した溶接部と、
を備えることを特徴とするシーズヒータ。 A metal pipe with a built-in heating wire,
A flange in which a conical burring portion having a predetermined cone angle is formed, and the metal pipe is inserted through the conical burring portion;
A welded portion obtained by welding the metal pipe and the tip of the conical burring portion of the flange;
A sheathed heater comprising: 前記円錐状バーリング部の先端部の内側エッジ部を前記金属パイプの外周部にリング状に線接触させるようにしたことを特徴とする請求項１に記載のシーズヒータ。   The sheathed heater according to claim 1, wherein an inner edge portion of a tip portion of the conical burring portion is brought into line contact with an outer peripheral portion of the metal pipe in a ring shape. 前記円錐状バーリング部の先端部の内側エッジ部と前記金属パイプの外周部との間に所定の隙間を設け、前記金属パイプと円錐状バーリング部の先端部とを肉盛り溶接接合したことを特徴とする請求項１に記載のシーズヒータ。   A predetermined gap is provided between the inner edge part of the tip part of the conical burring part and the outer peripheral part of the metal pipe, and the metal pipe and the tip part of the conical burring part are welded and joined together. The sheathed heater according to claim 1. 前記円錐状バーリング部の先端面が、円錐面状に形成されていることを特徴とする請求項１〜３のいずれか１つに記載のシーズヒータ。   The sheathed heater according to any one of claims 1 to 3, wherein a tip end surface of the conical burring portion is formed in a conical surface shape. 前記金属パイプの先端面と前記フランジの円錐状バーリング部の先端面とが、略面一に揃えられて溶接接合されていることを特徴とする請求項１〜４のいずれか１つに記載のシーズヒータ。   The front end surface of the metal pipe and the front end surface of the conical burring portion of the flange are substantially flush and welded together. Seeds heater. 前記金属パイプと前記フランジの円錐状バーリング部との間の断面三角形のリング状空間に封止材を充填したことを特徴とする請求項１〜５のいずれか１つに記載のシーズヒータ。   The sheathed heater according to any one of claims 1 to 5, wherein a sealing material is filled in a ring-shaped space having a triangular cross section between the metal pipe and the conical burring portion of the flange. 前記円錐状バーリング部の円錐角が、１５°〜３５°であることを特徴とする請求項１〜６のいずれか１つに記載のシーズヒータ。

The sheath heater according to claim 1, wherein a cone angle of the conical burring portion is 15 ° to 35 °.

JP2005274435A 2005-09-21 2005-09-21 Sheathed heater Pending JP2007087740A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010027582A (en) * 2008-07-24 2010-02-04 Chofu Seisakusho Co Ltd Manufacturing method of reformer for fuel cell
JP2018133167A (en) * 2017-02-14 2018-08-23 日本特殊陶業株式会社 Ceramic heater

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS553893U (en) * 1978-06-23 1980-01-11
JPS5864789A (en) * 1981-10-14 1983-04-18 松下電器産業株式会社 Method of producing sheathed heater with flange
JPS60118884U (en) * 1984-01-20 1985-08-10 三菱電機株式会社 Sheathed heater with fins
JP2004293982A (en) * 2003-03-27 2004-10-21 Calsonic Kansei Corp Core part structure of heat exchanger

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS553893U (en) * 1978-06-23 1980-01-11
JPS5864789A (en) * 1981-10-14 1983-04-18 松下電器産業株式会社 Method of producing sheathed heater with flange
JPS60118884U (en) * 1984-01-20 1985-08-10 三菱電機株式会社 Sheathed heater with fins
JP2004293982A (en) * 2003-03-27 2004-10-21 Calsonic Kansei Corp Core part structure of heat exchanger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010027582A (en) * 2008-07-24 2010-02-04 Chofu Seisakusho Co Ltd Manufacturing method of reformer for fuel cell
JP2018133167A (en) * 2017-02-14 2018-08-23 日本特殊陶業株式会社 Ceramic heater

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