JP2020159601A - Fluid heater and manufacturing method for fluid heater - Google Patents

Fluid heater and manufacturing method for fluid heater Download PDF

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JP2020159601A
JP2020159601A JP2019057733A JP2019057733A JP2020159601A JP 2020159601 A JP2020159601 A JP 2020159601A JP 2019057733 A JP2019057733 A JP 2019057733A JP 2019057733 A JP2019057733 A JP 2019057733A JP 2020159601 A JP2020159601 A JP 2020159601A
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flow path
heater
fluid
path member
tubular
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JP7269624B2 (en
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信一 矢部
Shinichi Yabe
信一 矢部
直斗 佐藤
Naoto Sato
直斗 佐藤
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Shinnetsu Co Ltd
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Abstract

To provide a fluid heater capable of suppressing change of a flow passage cross section with a simple structure.SOLUTION: A fluid heater 1 comprises: a cylindrical flow passage member 100 through which fluid to be heated circulates; and a sheath heater 10 including an intermediate part 11 arranged on the inner diameter side of the flow passage member and an end part 12 arranged so as to project outward from the flow passage member. The flow passage member comprises a protruding cylinder part 140 that is formed by connecting a first member 110 and a second member 120, which are divided and formed in a cylindrical axial direction, and formed so as to protrude outward from the first member, and into which the end part of the sheath heater is inserted. The first member has a recess part configured such that a part of an end part 111 to be connected to the second member is recessed with respect to the other part on the opposite side to the second member side so that the sheath heater can be inserted along a longitudinal direction of the protruding cylinder part.SELECTED DRAWING: Figure 5

Description

本発明は、被加熱流体が通流される流路の内部にシーズヒータを設けた流体加熱器、及び、このような流体加熱器の製造方法に関するものである。 The present invention relates to a fluid heater in which a sheathed heater is provided inside a flow path through which a fluid to be heated flows, and a method for manufacturing such a fluid heater.

シーズヒータは、筒状部材であるシースの内部に発熱線を収容するとともに、マグネシア等の絶縁体粉末を充填して構成された抵抗加熱電気ヒータである。
シーズヒータは、電気的絶縁性に優れており被加熱流体を安全に加熱することが可能であり、また、材質を適切に選択することにより、高温での使用も可能である。
また、シースを曲げ加工することにより、発熱部を設置スペースに応じた任意の形状に形成することが可能である。
The sheathed heater is a resistance heating electric heater configured by accommodating a heating wire inside a sheath which is a tubular member and filling it with an insulator powder such as magnesia.
The sheathed heater has excellent electrical insulation and can safely heat the fluid to be heated, and can also be used at a high temperature by appropriately selecting the material.
Further, by bending the sheath, it is possible to form the heat generating portion into an arbitrary shape according to the installation space.

シーズヒータにより被加熱流体を加熱する流体加熱器に関する従来技術として、例えば特許文献1には、被加熱流体が通流される筒状体の内部に、らせん状に巻き回したシーズヒータを収容した気体加熱器が記載されている。 As a prior art relating to a fluid heater that heats a fluid to be heated by a sheathed heater, for example, Patent Document 1 describes a gas containing a spirally wound sheathed heater inside a tubular body through which the fluid to be heated is passed. The heater is listed.

特開2007−101048号公報Japanese Unexamined Patent Publication No. 2007-101048

シーズヒータを、被加熱流体が通流される流路の中間部分に、端子部分が流路断面外側に突出した状態で配置しようとした場合、例えば流路を構成する筒状部材の周方向における半部を切り欠くとともに、筒体の外径側に張り出したボックス上のシーズヒータ挿入ポートを設けることが提案されている。(後述する本発明の比較例1を参照)
しかし、このような構成とした場合、シーズヒータ挿入ポートが設けられた箇所で、流路断面積が大きく変化し、被加熱流体がシーズヒータを避けてシーズヒータ挿入ポート内を通過することにより、加熱性能が低下することが懸念される。
上述した問題に鑑み、本発明の課題は、簡単な構造により流路断面の変化を抑制した流体加熱器及び流体加熱器の製造方法を提供することである。
When the sheathed heater is arranged in the middle portion of the flow path through which the fluid to be heated flows, with the terminal portion protruding outside the cross section of the flow path, for example, a half in the circumferential direction of the tubular member constituting the flow path. It has been proposed to cut out the portion and provide a sheathed heater insertion port on the box overhanging on the outer diameter side of the cylinder. (See Comparative Example 1 of the present invention described later)
However, in such a configuration, the cross-sectional area of the flow path changes significantly at the location where the sheathed heater insertion port is provided, and the fluid to be heated passes through the sheathed heater insertion port while avoiding the sheathed heater. There is a concern that the heating performance will deteriorate.
In view of the above-mentioned problems, an object of the present invention is to provide a fluid heater and a method for manufacturing a fluid heater in which changes in the cross section of the flow path are suppressed by a simple structure.

本発明は、以下のような解決手段により、上述した課題を解決する。
請求項1に係る発明は、被加熱流体が通流される筒状の流路部材と、筒状に形成されたシースの内部に発熱線及び絶縁体粉末を収容して構成され、前記流路部材の内径側に配置される中間部及び前記流路部材の外側へ突出して配置される端部を有するシーズヒータとを備える流体加熱器であって、前記流路部材は、筒軸方向に分割して形成された第1部材及び第2部材を接続して構成され、前記第1部材から外側に突き出して形成され前記シーズヒータの前記端部が挿入される突出筒部を備え、前記第1部材は、前記第2部材と接合される端部における一部を、前記シーズヒータを前記突出筒部の長手方向に沿って挿入可能なよう他部に対して前記第2部材側とは反対側に凹ませた凹部を有することを特徴とする流体加熱器である。
これによれば、流路部材を第1部材と第2部材とに軸方向に分割するとともに、分割線の形状を突出筒部の長手方向に沿ってシーズヒータを挿入可能なよう設定することによって、第1部材と第2部材との接合前に第1部材の内径側にシーズヒータを挿入し、その後第1部材と第2部材とを接合することが可能となる。
これにより、流路部材内の流路断面の変化を防止しつつ簡単にシーズヒータを内蔵した流体加熱器を得ることができる。
このため、被加熱流体がシーズヒータを避けて流れることが抑制され、加熱効率を向上するとともに、流路部材の基本断面形状が維持されることにより、例えばシーズヒータを挿入するためのポートなど局所的に異なる形状の構造体が設けられることに起因する不具合を防止することができる。
The present invention solves the above-mentioned problems by the following solutions.
The invention according to claim 1 is configured by accommodating a heating wire and an insulator powder inside a tubular flow path member through which a fluid to be heated flows and a sheath formed in the tubular shape. A fluid heater including an intermediate portion arranged on the inner diameter side of the above and a sheathed heater having an end portion arranged so as to project to the outside of the flow path member, and the flow path member is divided in the tubular axis direction. The first member is formed by connecting the first member and the second member, and is provided with a protruding tubular portion formed so as to project outward from the first member and into which the end portion of the sheathed heater is inserted. Is a part of the end portion joined to the second member on the side opposite to the second member side with respect to the other portion so that the sheathed heater can be inserted along the longitudinal direction of the protruding cylinder portion. It is a fluid heater characterized by having a recessed recess.
According to this, the flow path member is divided into the first member and the second member in the axial direction, and the shape of the dividing line is set so that the sheathed heater can be inserted along the longitudinal direction of the protruding cylinder portion. Before joining the first member and the second member, a sheathed heater can be inserted on the inner diameter side of the first member, and then the first member and the second member can be joined.
As a result, it is possible to easily obtain a fluid heater having a built-in sheathed heater while preventing a change in the cross section of the flow path in the flow path member.
Therefore, the fluid to be heated is suppressed from flowing away from the sheathed heater, the heating efficiency is improved, and the basic cross-sectional shape of the flow path member is maintained, so that, for example, a port for inserting the sheathed heater is locally formed. It is possible to prevent problems caused by the provision of structures having different shapes.

請求項2に係る発明は、前記第1部材と前記第2部材とが接合される接合部は、前記流路部材の筒軸方向に対して傾斜した平面に沿って配置されることを特徴とする請求項1に記載の流体加熱である。
これによれば、第1部材と第2部材との分割線が所定の方向から見たときに直線状になることから、第1部材と第2部材との突き合せ箇所を形成する加工が容易である。
また、分割線にコーナ部などが形成されないため、接合が容易であるとともに、応力集中を防止して耐久性、信頼性を確保することができる。
さらに、分割線に流路部材の周方向と直交する箇所がないことから、被加熱流体の圧力が高く流路部材の周方向に著大な引張応力が加わる場合であっても、分割線における損傷を抑制して耐圧性、耐久性、信頼性を確保することができる。
The invention according to claim 2 is characterized in that the joint portion to which the first member and the second member are joined is arranged along a plane inclined with respect to the tubular axis direction of the flow path member. The fluid heating according to claim 1.
According to this, since the dividing line between the first member and the second member becomes a straight line when viewed from a predetermined direction, it is easy to process the butt portion between the first member and the second member. Is.
Further, since a corner portion or the like is not formed on the dividing line, it is easy to join, stress concentration can be prevented, and durability and reliability can be ensured.
Further, since the dividing line does not have a portion orthogonal to the circumferential direction of the flow path member, even when the pressure of the fluid to be heated is high and a large tensile stress is applied in the circumferential direction of the flow path member, the dividing line is formed. Damage can be suppressed and pressure resistance, durability, and reliability can be ensured.

請求項3に係る発明は、前記第1部材と前記第2部材とは突合せ溶接により接合されており、前記第1部材と前記第2部材との接合部における前記流路部材の内周面に沿って、内径側への溶接ビードの突出を防止する保護部材が設けられることを特徴とする請求項1又は請求項2に記載の流体加熱器である。
これによれば、溶接のビードが流路部材の内径側に突出し、シーズヒータに損傷を与えることを防止できる。
In the invention according to claim 3, the first member and the second member are joined by butt welding, and the inner peripheral surface of the flow path member at the joint portion between the first member and the second member. The fluid heater according to claim 1 or 2, wherein a protective member for preventing the weld bead from protruding toward the inner diameter side is provided along the line.
According to this, it is possible to prevent the weld bead from protruding toward the inner diameter side of the flow path member and damaging the sheathed heater.

請求項4に係る発明は、被加熱流体が通流される筒状の流路部材と、筒状に形成されたシースの内部に発熱線及び絶縁体粉末を収容して構成され、前記流路部材の内径側に配置される中間部及び前記流路部材の外側に突出して配置される端部を有するシーズヒータとを備える流体加熱器の製造方法であって、前記流路部材は、筒軸方向に分割して形成された第1部材及び第2部材を有して構成され、前記第1部材に外側に突き出して形成され前記シーズヒータの前記端部が挿入される突出筒部を取り付ける第1の工程と、前記シーズヒータの前記端部を前記突出筒部の長手方向に沿って挿入し前記発熱部が前記流路部材の筒軸方向から見たときに前記第1部材の内側となるように配置する第2の工程と、前記第1部材と前記第2部材とを突き合せた状態で接合する第3の工程とを有することを特徴とする流体加熱器の製造方法である。
請求項5に係る発明は、前記第3の工程は、前記第1部材と前記第2部材とを突合せ溶接するものであり、前記第1部材と前記第2部材との接合部の内径側に溶接ビードが突出することを防止する保護部材を設けた状態で行われることを特徴とする請求項4に記載の流体加熱器の製造方法である。
これらの各発明においても、上述した流体加熱器に係る発明と実質的に同様の効果を得ることができる。
The invention according to claim 4 is configured by accommodating a heating wire and an insulator powder inside a tubular flow path member through which a fluid to be heated flows and a sheath formed in the tubular shape. A method for manufacturing a fluid heater including an intermediate portion arranged on the inner diameter side of the fluid and a sheathed heater having an end portion protruding outside the flow path member, wherein the flow path member is in the axial direction. A first member having a first member and a second member formed by dividing into a first member, and attaching a protruding cylinder portion formed to protrude outward to the first member and into which the end portion of the sheathed heater is inserted. And the end portion of the sheathed heater are inserted along the longitudinal direction of the protruding tubular portion so that the heat generating portion is inside the first member when viewed from the tubular axis direction of the flow path member. This is a method for manufacturing a fluid heater, which comprises a second step of arranging the first member and a third step of joining the first member and the second member in a butted state.
In the invention according to claim 5, in the third step, the first member and the second member are butt-welded, and the inner diameter side of the joint between the first member and the second member is formed. The method for manufacturing a fluid heater according to claim 4, wherein the welding bead is provided with a protective member for preventing the weld bead from protruding.
In each of these inventions, substantially the same effect as the above-described invention relating to the fluid heater can be obtained.

以上説明したように、本発明によれば、簡単な構造により流路断面の変化を抑制した流体加熱器及び流体加熱器の製造方法を提供することができる。 As described above, according to the present invention, it is possible to provide a fluid heater and a method for manufacturing a fluid heater in which changes in the cross section of the flow path are suppressed by a simple structure.

本発明を適用した流体加熱器の第1実施形態の断面図である。It is sectional drawing of 1st Embodiment of the fluid heater to which this invention was applied. 第1実施形態の流体加熱器における流路部材の第1部材と第2部材との接合部の拡大断面図である。FIG. 5 is an enlarged cross-sectional view of a joint portion between a first member and a second member of a flow path member in the fluid heater of the first embodiment. 第1実施形態の流体加熱器の製造工程であって、流路部材の分割工程を示す図である。It is a figure which shows the manufacturing process of the fluid heater of 1st Embodiment, and shows the process of dividing a flow path member. 第1実施形態の流体加熱器の製造工程であって、シーズヒータの取付工程を示す図である。It is a manufacturing process of the fluid heater of 1st Embodiment, and is a figure which shows the mounting process of a sheathed heater. 第1実施形態の流体加熱器の製造工程であって、第1部材への第2部材の取付工程を示す図である。It is a figure which shows the manufacturing process of the fluid heater of 1st Embodiment, and the process of attaching the 2nd member to the 1st member. 本発明の比較例1である流体加熱器の断面図である。It is sectional drawing of the fluid heater which is a comparative example 1 of this invention. 本発明の比較例2である流体加熱器の断面図である。It is sectional drawing of the fluid heater which is a comparative example 2 of this invention. 本発明を適用した流体加熱器の第2実施形態の断面図である。It is sectional drawing of the 2nd Embodiment of the fluid heater to which this invention was applied.

<第1実施形態>
以下、本発明を適用した流体加熱器、及び、流体加熱器の製造方法の第1実施形態について説明する。
第1実施形態の流体加熱器は、例えば、各種気体や蒸気、液体、気液混合流体などの各種被加熱流体を、流路中に設置されたシーズヒータを用いて加熱するものである。
<First Embodiment>
Hereinafter, a fluid heater to which the present invention is applied and a first embodiment of a method for manufacturing a fluid heater will be described.
The fluid heater of the first embodiment heats various fluids to be heated such as various gases, steams, liquids, and gas-liquid mixed fluids by using a sheathed heater installed in a flow path.

図1は、第1実施形態の流体加熱器の断面図であって、流路部材の中心軸を含む平面で切って見た状態を示す図である。(後述する図3乃至8において同じ。)
流体加熱器1は、シーズヒータ10、流路部材100等を有して構成されている。
シーズヒータ10は、例えばステンレス系合金等の金属製の円筒状の部材であるシースの内径側に、その長手方向に沿って、例えばニクロム系の金属により形成された発熱線を配置するとともに、シースの内部に例えばマグネシア等の絶縁体粉末を封入して構成されている。
シーズヒータ10は、発熱部11、端部12等を有する。
FIG. 1 is a cross-sectional view of the fluid heater of the first embodiment, and is a view showing a state of being cut by a plane including a central axis of a flow path member. (The same applies to FIGS. 3 to 8 described later.)
The fluid heater 1 includes a sheathed heater 10, a flow path member 100, and the like.
The sheathed heater 10 arranges a heating wire formed of, for example, a nichrome-based metal along the longitudinal direction of the sheath, which is a cylindrical member made of a metal such as a stainless steel alloy, and the sheath. It is configured by enclosing an insulator powder such as magnesia inside the above.
The sheathed heater 10 has a heat generating portion 11, an end portion 12, and the like.

発熱部11は、シースの長手方向における中間部を、例えばらせん状などに巻き回して形成した部分である。
発熱部11は、流路部材100の内径側に配置され、流路部材100の内部を通流される被加熱流体と直接接触して被加熱流体を加熱する部分である。
端部12は、シースの長手方向における端部を直線状に形成した部分であって、流路部材100から外径側に突出して配置され、端子13を介して図示しない電源装置と接続される部分である。
端部12は、後述する突出筒部140に挿入される。
The heat generating portion 11 is a portion formed by winding an intermediate portion in the longitudinal direction of the sheath, for example, in a spiral shape.
The heat generating portion 11 is arranged on the inner diameter side of the flow path member 100, and is a portion that heats the heated fluid in direct contact with the heated fluid flowing through the inside of the flow path member 100.
The end portion 12 is a portion in which the end portion in the longitudinal direction of the sheath is formed in a straight line, is arranged so as to project from the flow path member 100 toward the outer diameter side, and is connected to a power supply device (not shown) via a terminal 13. It is a part.
The end portion 12 is inserted into the protruding cylinder portion 140, which will be described later.

流路部材100は、被加熱流体が通流される円筒状の部材である。
流路部材100は、例えばステンレス鋼などの耐熱性を有する金属材料によって形成されている。
流路部材100は、その中心軸(筒軸)方向に分割された第1部材110、第2部材120を、対向する端縁間で突合せ溶接し、接合して構成されている。
The flow path member 100 is a cylindrical member through which the fluid to be heated flows.
The flow path member 100 is made of a heat-resistant metal material such as stainless steel.
The flow path member 100 is configured by butt-welding the first member 110 and the second member 120 divided in the central axis (cylindrical axis) direction between the opposite end edges and joining them.

第1部材110、第2部材120は、例えば、単一の円筒状の部材を切断して形成された円筒状の部材であって、同心に配置されている。
第1部材110の第2部材120側の端縁部111と、第2部材120の第1部材110側の端縁部121とは、後述する突出筒部140が設けられる側で第1部材110が第2部材120側に張り出し、その反対側で第2部材120が第1部材110側に張り出すように、流路部材100の中心軸に対して傾斜した平面に沿って配置されている。
The first member 110 and the second member 120 are, for example, cylindrical members formed by cutting a single cylindrical member and are arranged concentrically.
The end edge portion 111 of the first member 110 on the second member 120 side and the end edge portion 121 of the second member 120 on the first member 110 side are the first member 110 on the side where the protruding cylinder portion 140 described later is provided. Is arranged along a plane inclined with respect to the central axis of the flow path member 100 so that the second member 120 projects toward the second member 120 and the second member 120 projects toward the first member 110 on the opposite side.

保護部材130は、第1部材110の端縁部111と、第2部材の120の端縁部121との接合部における流路部材100の内径側に設けられている。
保護部材130は、流路部材100の本体部に対して比較的板厚が薄いステンレス鋼などの金属によって帯状に形成され、溶接箇所に沿って延在し、第1部材110と第2部材120との少なくとも一方に固定された状態で貼付されている。
保護部材130は、第1部材110と第2部材120とを溶接により接合する際に、流路部材100の内径側に溶接ビードが突出し、シーズヒータ10に損傷を与えることを防止するものである。
The protective member 130 is provided on the inner diameter side of the flow path member 100 at the joint between the end edge portion 111 of the first member 110 and the end edge portion 121 of the second member 120.
The protective member 130 is formed in a band shape with a metal such as stainless steel, which is relatively thin with respect to the main body of the flow path member 100, extends along the welded portion, and the first member 110 and the second member 120. It is attached in a state of being fixed to at least one of the above.
The protective member 130 prevents the weld bead from protruding toward the inner diameter side of the flow path member 100 and damaging the sheathed heater 10 when the first member 110 and the second member 120 are joined by welding. ..

図2は、第1実施形態の流体加熱器における流路部材の第1部材と第2部材との接合部の拡大断面図である。
図2は、図1におけるII部を示しており、図2(a)は溶接後の状態を示し、図2(b)は溶接前の状態を示している。
図2(a)に示すように、第1部材110の端縁部111と、第2部材120の端縁部121とは、溶接金属からなる溶接継手Wによって接合されている。
なお、溶接継手Wに沿って保護部材130が設けられることにより、溶接金属からなるビードが流路部材100の内径側に突出することが防止されている。
FIG. 2 is an enlarged cross-sectional view of a joint portion between the first member and the second member of the flow path member in the fluid heater of the first embodiment.
FIG. 2 shows a part II in FIG. 1, FIG. 2 (a) shows a state after welding, and FIG. 2 (b) shows a state before welding.
As shown in FIG. 2A, the edge portion 111 of the first member 110 and the edge portion 121 of the second member 120 are joined by a welded joint W made of weld metal.
By providing the protective member 130 along the welded joint W, it is prevented that the bead made of the weld metal protrudes toward the inner diameter side of the flow path member 100.

図2(b)に示すように、溶接前の状態においては、端縁部111,121の間には、流路部材100の外径側に開いたV字溝状の開先が形成されている。
このような開先形状は、例えば、溶接前に端縁部111,121に切削加工を施すことによって形成することができる。
As shown in FIG. 2B, in the state before welding, a V-shaped groove-shaped groove opened on the outer diameter side of the flow path member 100 is formed between the edge portions 111 and 121. There is.
Such a groove shape can be formed, for example, by cutting the edge portions 111 and 121 before welding.

突出筒部140は、流路部材100の第1部材110の外周面に形成された開口から、第1部材110の外径側に突出して形成された円筒状の部分である。
突出筒部140は、シーズヒータ10の端部12が挿入される。
The protruding tubular portion 140 is a cylindrical portion formed so as to project from the opening formed on the outer peripheral surface of the first member 110 of the flow path member 100 to the outer diameter side of the first member 110.
The end portion 12 of the sheathed heater 10 is inserted into the protruding cylinder portion 140.

第1実施形態においては、図1に示すように、第1部材110の端縁部111と、第2部材120の端縁部121との分割線PLを、流路部材100の周方向において、第1部材110の突出筒部140が設けられる領域(図1における上側)が、第2部材120側に張り出すように、流路部材100の中心軸に対して傾斜した平面に沿って配置している。
その結果、流路部材100の周方向において、突出筒部140が設けられる領域とは反対側の領域(図1における下側)には、第1部材110の端縁部111が第2部材120側とは反対側に凹んだ凹部が形成される。
In the first embodiment, as shown in FIG. 1, a dividing line PL between the edge portion 111 of the first member 110 and the edge portion 121 of the second member 120 is drawn in the circumferential direction of the flow path member 100. The region (upper side in FIG. 1) where the protruding cylinder portion 140 of the first member 110 is provided is arranged along a plane inclined with respect to the central axis of the flow path member 100 so as to project toward the second member 120 side. ing.
As a result, in the circumferential direction of the flow path member 100, the end edge portion 111 of the first member 110 is the second member 120 in the region (lower side in FIG. 1) opposite to the region where the protruding cylinder portion 140 is provided. A concave recess is formed on the side opposite to the side.

この凹部の領域においては、分割線PLは、流路部材100の中心軸方向における位置が、突出筒部140の位置に対して第1部材110側(第2部材120側とは反対側)にオフセットして配置されている。
その結果、第1部材110に第2部材120を接合する前の状態においては、シーズヒータ10は、凹部側から突出筒部140の長手方向に沿って、突出筒部140に端部12を挿入しつつ、第1部材の110の内径側に挿入することが可能となっている。
In the region of the recess, the position of the dividing line PL in the central axis direction of the flow path member 100 is on the first member 110 side (opposite to the second member 120 side) with respect to the position of the protruding cylinder portion 140. They are arranged offset.
As a result, in the state before joining the second member 120 to the first member 110, the sheathed heater 10 inserts the end portion 12 into the protruding cylinder portion 140 from the recess side along the longitudinal direction of the protruding cylinder portion 140. While doing so, it can be inserted into the inner diameter side of 110 of the first member.

次に、第1実施形態の流体加熱器の製造方法について説明する。
図3は、第1実施形態の流体加熱器の製造工程であって、流路部材の分割工程を示す図である。
先ず、図3(a)に示すように、流路部材100の母材となる円筒部材を準備する。
次に、流路部材100を上述した分割線PLに沿って切断し、第1部材110、第2部材120に分割する。
その後、端縁部111、121に切削加工を施して、図2(b)に示す開先形状を形成する。
Next, a method of manufacturing the fluid heater of the first embodiment will be described.
FIG. 3 is a diagram showing a manufacturing process of the fluid heater of the first embodiment and a step of dividing the flow path member.
First, as shown in FIG. 3A, a cylindrical member to be a base material of the flow path member 100 is prepared.
Next, the flow path member 100 is cut along the above-mentioned dividing line PL and divided into the first member 110 and the second member 120.
After that, the edge portions 111 and 121 are cut to form the groove shape shown in FIG. 2 (b).

図4は、第1実施形態の流体加熱器の製造工程であって、シーズヒータの取付工程を示す図である。
まず、第1部材110の端縁部111と隣接する領域であって、流路部材100の周方向において端縁部111が第2部材120側へ張り出した箇所へ、開口を形成してこの開口を介して第1部材110の内部と連通するよう、突出筒部140を取り付ける。
突出筒部140は、第1部材110に、例えば溶接などによって固定される。(第1の工程)
その後、シーズヒータ10は、第1部材110の端縁部111の上述した凹部側から、突出筒部140の長手方向に沿って、突出筒部140に端部12を挿入しつつ、第1部材110の内径側に発熱部11が配置されるよう設置される。(第2の工程)
FIG. 4 is a diagram showing a manufacturing process of the fluid heater of the first embodiment and a mounting process of the sheathed heater.
First, an opening is formed in a region adjacent to the edge portion 111 of the first member 110, where the edge portion 111 projects toward the second member 120 in the circumferential direction of the flow path member 100. The protruding cylinder portion 140 is attached so as to communicate with the inside of the first member 110 via the above.
The protruding cylinder portion 140 is fixed to the first member 110 by, for example, welding. (First step)
After that, the sheathed heater 10 is the first member while inserting the end portion 12 into the protruding cylinder portion 140 from the recessed side of the end edge portion 111 of the first member 110 along the longitudinal direction of the protruding cylinder portion 140. The heat generating portion 11 is installed so as to be arranged on the inner diameter side of the 110. (Second step)

図5は、第1実施形態の流体加熱器の製造工程であって、第1部材への第2部材の取付工程を示す図である。
第2部材120の端縁部121には、保護部材130が取り付けられる。
その後、第2部材120を、第1部材110と同心となるように配置して第1部材110に近接させる。
このとき、シーズヒータ10の発熱部11は、第2部材120の内径側へ挿入される。
そして、流路部材100の長手方向における完成寸法が所定の長さとなるように、第1部材110と第2部材120との相対位置を、図示しない冶具によって拘束した状態で、端縁部111、121の溶接を流路部材100の全周にわたって行う。(第3の工程)
FIG. 5 is a diagram showing a manufacturing process of the fluid heater of the first embodiment and a process of attaching the second member to the first member.
A protective member 130 is attached to the edge portion 121 of the second member 120.
After that, the second member 120 is arranged so as to be concentric with the first member 110 and brought close to the first member 110.
At this time, the heat generating portion 11 of the sheathed heater 10 is inserted into the inner diameter side of the second member 120.
Then, in a state where the relative positions of the first member 110 and the second member 120 are restrained by a jig (not shown) so that the completed dimension of the flow path member 100 in the longitudinal direction becomes a predetermined length, the edge portion 111, Welding of 121 is performed over the entire circumference of the flow path member 100. (Third step)

以下、上述した第1実施形態の効果を、以下説明する本発明の比較例1,2と対比して説明する。
比較例1,2及び後述する実施形態において、第1実施形態と共通する箇所には同じ符号を付して説明を省略し、主に相違点について説明する。
図6は、本発明の比較例1である流体加熱器の断面図である。
比較例1の流体加熱器1Aは、流路部材100を2分割することに代えて、以下説明するヒータ挿入ポート210を設け、このヒータ挿入ポート210から流路部材100の内径側にシーズヒータ10の発熱部を挿入している。
Hereinafter, the effects of the first embodiment described above will be described in comparison with Comparative Examples 1 and 2 of the present invention described below.
In Comparative Examples 1 and 2 and the embodiments described later, the same reference numerals are given to the parts common to the first embodiment, the description thereof will be omitted, and the differences will be mainly described.
FIG. 6 is a cross-sectional view of a fluid heater according to Comparative Example 1 of the present invention.
In the fluid heater 1A of Comparative Example 1, instead of dividing the flow path member 100 into two, a heater insertion port 210 described below is provided, and the sheathed heater 10 is provided on the inner diameter side of the flow path member 100 from the heater insertion port 210. The heat generating part of is inserted.

ヒータ挿入ポート210は、流路部材100の周方向における突出筒部140側の半部を切り欠いた開口から、流路部材100の外径側に突出して形成されたボックス状の部分である。
ヒータ挿入ポート210には、シーズヒータ10を流路部材100の内部に挿入可能な開口211、及び、この開口211に着脱可能に取り付けられる蓋部212が設けられている。
突出筒部140は、蓋部212から突出して設けられている。
比較例1においては、シーズヒータ10は、ヒータ挿入ポート210の蓋部212を取り外した状態で、開口211から流路部材100の内部に挿入される。
その後、端部12が突出筒部140に挿入されるよう蓋部212を取り付け、固定する。
The heater insertion port 210 is a box-shaped portion formed so as to project toward the outer diameter side of the flow path member 100 from an opening notched in a half portion on the protruding cylinder portion 140 side in the circumferential direction of the flow path member 100.
The heater insertion port 210 is provided with an opening 211 into which the sheathed heater 10 can be inserted into the flow path member 100, and a lid portion 212 detachably attached to the opening 211.
The protruding cylinder portion 140 is provided so as to project from the lid portion 212.
In Comparative Example 1, the sheathed heater 10 is inserted into the flow path member 100 through the opening 211 with the lid portion 212 of the heater insertion port 210 removed.
After that, the lid portion 212 is attached and fixed so that the end portion 12 is inserted into the protruding cylinder portion 140.

比較例1においては、流体加熱器1Aの内部における流路断面が、ヒータ挿入ポート210が設けられる領域において急激に変化し、流路断面積が局所的に大きくなる。
このため、図6において左側から右側へ通流される被加熱流体の流れFの一部は、流路部材100から外れてヒータ挿入ポート210の内部を流れてしまい、十分に加熱されない場合がある。
また、流体加熱器1Bの内部圧力が高い場合には、ヒータ挿入ポート210が耐圧性が局所的に低くなる脆弱部となって、被加熱流体のリークや、溶接箇所の破断などの損傷の発生が懸念される。
In Comparative Example 1, the cross section of the flow path inside the fluid heater 1A changes abruptly in the region where the heater insertion port 210 is provided, and the cross section of the flow path locally increases.
Therefore, a part of the flow F of the fluid to be heated, which flows from the left side to the right side in FIG. 6, may be separated from the flow path member 100 and flow inside the heater insertion port 210, and may not be sufficiently heated.
Further, when the internal pressure of the fluid heater 1B is high, the heater insertion port 210 becomes a fragile portion where the pressure resistance is locally lowered, causing damage such as leakage of the fluid to be heated and breakage of the welded portion. Is a concern.

図7は、本発明の比較例2である流体加熱器の断面図である。
比較例2の流体加熱器1Bにおいては、流路部材100の筒軸方向において、シーズヒータ10が設けられる領域における突出筒部140側とは反対側の半部を、シーズヒータ挿入部150として切除するとともに、この切除により形成された開口からシーズヒータ10を挿入した後に、シーズヒータ挿入部150をもとの位置に戻し、溶接により接合している。
FIG. 7 is a cross-sectional view of a fluid heater according to Comparative Example 2 of the present invention.
In the fluid heater 1B of Comparative Example 2, in the tubular axis direction of the flow path member 100, the half portion on the side opposite to the protruding tubular portion 140 side in the region where the sheathed heater 10 is provided is cut off as the sheathed heater insertion portion 150. At the same time, after inserting the sheathed heater 10 through the opening formed by this excision, the sheathed heater insertion portion 150 is returned to the original position and joined by welding.

比較例2においては、流路部材100から切除されたシーズヒータ挿入部150を、再び精度よく流路部材100に接合することが困難である。
例えば、シーズヒータ挿入部150の長手方向の寸法は、切断加工に起因してこれを取り付けるべき開口の寸法よりも小さくなるが、これを隙間なく溶接により接合することは困難である。
また、シーズヒータ挿入部150を長手方向から見た場合の曲率半径が、流路部材100の本来の曲率半径に対して変化する変形(例えば、曲率半径が大きくなって開いてしまう)も問題となる。
さらに、シーズヒータ挿入部150と流路部材100本体との間に、流路部材100の軸方向に沿った継手が形成されることになるが、このような継手は流路部材100の内部に圧力がかかった場合には引張応力を受けることとなり、特に被加熱流体の圧力が高い場合には、信頼性、耐久性の確保が困難となる。
In Comparative Example 2, it is difficult to accurately join the sheathed heater insertion portion 150 cut off from the flow path member 100 to the flow path member 100 again.
For example, the longitudinal dimension of the sheathed heater insertion portion 150 is smaller than the dimension of the opening to which it should be attached due to the cutting process, but it is difficult to join them by welding without gaps.
Another problem is that the radius of curvature of the sheathed heater insertion portion 150 when viewed from the longitudinal direction changes with respect to the original radius of curvature of the flow path member 100 (for example, the radius of curvature becomes large and opens). Become.
Further, a joint along the axial direction of the flow path member 100 is formed between the sheathed heater insertion portion 150 and the main body of the flow path member 100, and such a joint is inside the flow path member 100. When pressure is applied, tensile stress is applied, and especially when the pressure of the fluid to be heated is high, it becomes difficult to ensure reliability and durability.

これに対し、第1実施形態によれば、以下の効果を得ることができる。
(1)流路部材100を、第1部材110と第2部材120とに軸方向に分割するとともに、分割線PLの形状を、突出筒部140の長手方向に沿ってシーズヒータ10を挿入可能なよう設定することによって、第1部材110と第2部材120との接合前に第1部材110の内径側にシーズヒータ10を挿入し、その後第1部材110と第2部材120とを接合するが可能となる。
これによって、流路部材100内の流路断面の変化を防止しつつ簡単にシーズヒータ10を内蔵した流体加熱器1を得ることができる。
このため、被加熱流体の流れFがシーズヒータ10を避けて流れることが抑制され、加熱効率を向上するとともに、流路部材100の基本断面形状が維持されることにより、例えばヒータ挿入ポートなど局所的に異なる形状の構造体が設けられることに起因する不具合を防止することができる。
(2)第1部材110と第2部材120との分割線PLが、流路部材100の径方向視において流路部材100の中心軸に対して傾斜した直線状になることから、第1部材110と第2部材120との突き合せ箇所を形成する加工(切断、開先形状の形成等)が容易である。
また、分割線PLにコーナ部などが形成されないため、溶接作業が容易であるとともに、応力集中を防止して耐久性、信頼性を確保することができる。
さらに、分割線PLに流路部材100の周方向と直交する箇所がないことから、被加熱流体の圧力が高く流路部材100の周方向に著大な引張応力が加わる場合であっても、分割線PLにおける損傷を抑制して耐圧性、耐久性、信頼性を確保することができる。
(3)第1部材110と第2部材120との溶接箇所の内径側に保護部材130を設けたことにより、溶接のビードが流路部材100の内径側に突出し、シーズヒータ10に損傷を与えることを防止できる。
On the other hand, according to the first embodiment, the following effects can be obtained.
(1) The flow path member 100 can be divided into a first member 110 and a second member 120 in the axial direction, and the sheathed heater 10 can be inserted into the shape of the dividing line PL along the longitudinal direction of the protruding cylinder portion 140. By setting such as, the sheathed heater 10 is inserted on the inner diameter side of the first member 110 before joining the first member 110 and the second member 120, and then the first member 110 and the second member 120 are joined. Is possible.
As a result, it is possible to easily obtain the fluid heater 1 having the sheathed heater 10 built-in while preventing the change in the cross section of the flow path in the flow path member 100.
Therefore, the flow F of the fluid to be heated is suppressed from flowing away from the sheathed heater 10, the heating efficiency is improved, and the basic cross-sectional shape of the flow path member 100 is maintained, so that, for example, a heater insertion port is locally formed. It is possible to prevent problems caused by the provision of structures having different shapes.
(2) Since the dividing line PL between the first member 110 and the second member 120 becomes a linear shape inclined with respect to the central axis of the flow path member 100 in the radial direction of the flow path member 100, the first member Processing (cutting, forming a groove shape, etc.) for forming a butt portion between the 110 and the second member 120 is easy.
Further, since the corner portion or the like is not formed on the dividing line PL, the welding work can be facilitated, stress concentration can be prevented, and durability and reliability can be ensured.
Further, since the dividing line PL does not have a portion orthogonal to the circumferential direction of the flow path member 100, even when the pressure of the fluid to be heated is high and a large tensile stress is applied in the circumferential direction of the flow path member 100, Damage on the dividing line PL can be suppressed to ensure pressure resistance, durability, and reliability.
(3) By providing the protective member 130 on the inner diameter side of the welded portion between the first member 110 and the second member 120, the weld bead protrudes toward the inner diameter side of the flow path member 100 and damages the sheathed heater 10. Can be prevented.

<第2実施形態>
次に、本発明を適用した流体加熱器の第2実施形態について説明する。
図8は、第2実施形態の流体加熱器の断面図である。
第2実施形態においては、第1部材110と第2部材120との分割線PLを、図8に示すように屈曲させて形成している。
分割線PLは、流路部材100の周方向において、突出筒部140近傍の領域、及び、この領域と流路部材100の中心軸対称となる領域においては、流路部材100の中心軸と直交する平面に沿って配置され、それ以外の中間部においては、第1実施形態と同様に流路部材100の中心軸に対して傾斜する平面に沿って配置されている。
以上説明した第2実施形態においても、上述した第1実施形態の効果と同様の効果を得ることができる。
<Second Embodiment>
Next, a second embodiment of the fluid heater to which the present invention is applied will be described.
FIG. 8 is a cross-sectional view of the fluid heater of the second embodiment.
In the second embodiment, the dividing line PL of the first member 110 and the second member 120 is formed by bending as shown in FIG.
The dividing line PL is orthogonal to the central axis of the flow path member 100 in the region near the protruding cylinder portion 140 in the circumferential direction of the flow path member 100 and in the region symmetrical with the central axis of this region and the flow path member 100. It is arranged along a plane to be formed, and in the other intermediate portions, it is arranged along a plane inclined with respect to the central axis of the flow path member 100 as in the first embodiment.
Also in the second embodiment described above, the same effect as that of the first embodiment described above can be obtained.

(変形例)
本発明は、以上説明した各実施形態に限定されることなく、種々の変形や変更が可能であって、それらも本発明の技術的範囲内である。
(1)流体加熱器及びその製造方法の具体的構成は、上述した各実施形態に限定されることなく、適宜変更することが可能である。
例えば、各部材の構造、形状、材質、製法、数量、配置等は、各実施形態の構成から適宜変更することが可能である。
(2)各実施形態において、流路部材の横断面形状は例えば円形(真円)であったが、本発明はこれに限らず、例えば楕円形、矩形、その他の形状の横断面形状を有する流路部材を有する流体加熱器にも適用することができる。
また、流路部材の内部でシーズヒータを湾曲又は屈曲させる形状も、実施形態のようならせん状には特に限定されず、適宜変更することができる。
(3)各実施形態において、流路部材の第1部材と第2部材とは突き合せ溶接により接合されているが、接合手法はこれに限らず適宜変更することができる。
例えば、第1部材と第2部材との間にわたしてダブラ(重ね板)を配置し、例えば構造用接着剤、摩擦攪拌接合、リベット等の機械的締結手段など、溶接以外の手法により、あるいは、これらの手法を溶接と組み合わせて用いてもよい。
また、第1部材と第2部材とを、例えばフランジ結合により着脱可能に接続してもよい。
(Modification example)
The present invention is not limited to the embodiments described above, and various modifications and modifications can be made, and these are also within the technical scope of the present invention.
(1) The specific configuration of the fluid heater and its manufacturing method is not limited to each of the above-described embodiments, and can be appropriately changed.
For example, the structure, shape, material, manufacturing method, quantity, arrangement, etc. of each member can be appropriately changed from the configuration of each embodiment.
(2) In each embodiment, the cross-sectional shape of the flow path member is, for example, a circle (perfect circle), but the present invention is not limited to this, and has, for example, an elliptical, rectangular, or other cross-sectional shape. It can also be applied to a fluid heater having a flow path member.
Further, the shape of bending or bending the sheathed heater inside the flow path member is not particularly limited to the spiral shape as in the embodiment, and can be appropriately changed.
(3) In each embodiment, the first member and the second member of the flow path member are joined by butt welding, but the joining method is not limited to this and can be appropriately changed.
For example, a doubler (lap plate) is placed between the first member and the second member, and by a method other than welding, for example, a structural adhesive, friction stir welding, mechanical fastening means such as rivets, or the like. , These techniques may be used in combination with welding.
Further, the first member and the second member may be detachably connected by, for example, flange coupling.

1,1A,1B,1C 流体加熱器
10 シーズヒータ 11 発熱部
12 端部 13 端子
100 流路部材 110 第1部材
111 端縁部 120 第2部材
121 端縁部 130 保護部材
140 突出筒部 150 シーズヒータ挿入部
210 ヒータ挿入ポート 211 開口
212 蓋部
PL 分割線 W 溶接継手
F 被加熱流体の流れ
1,1A, 1B, 1C Fluid heater 10 Seeds heater 11 Heat generation part 12 End part 13 Terminal 100 Flow path member 110 First member 111 End edge part 120 Second member 121 End edge part 130 Protective member 140 Protruding cylinder part 150 Seeds Heater insertion part 210 Heater insertion port 211 Opening 212 Lid part PL dividing line W Welded joint F Flow of fluid to be heated

Claims (5)

被加熱流体が通流される筒状の流路部材と、
筒状に形成されたシースの内部に発熱線及び絶縁体粉末を収容して構成され、前記流路部材の内径側に配置される中間部及び前記流路部材の外側へ突出して配置される端部を有するシーズヒータと
を備える流体加熱器であって、
前記流路部材は、筒軸方向に分割して形成された第1部材及び第2部材を接続して構成され、
前記第1部材から外側に突き出して形成され前記シーズヒータの前記端部が挿入される突出筒部を備え、
前記第1部材は、前記第2部材と接合される端部における一部を、前記シーズヒータを前記突出筒部の長手方向に沿って挿入可能なよう他部に対して前記第2部材側とは反対側に凹ませた凹部を有すること
を特徴とする流体加熱器。
A tubular flow path member through which the fluid to be heated flows, and
A heat-generating wire and an insulator powder are housed inside a tubular sheath, and an intermediate portion arranged on the inner diameter side of the flow path member and an end projecting to the outside of the flow path member are arranged. A fluid heater equipped with a sheathed heater having a part,
The flow path member is configured by connecting a first member and a second member formed by being divided in the tubular axis direction.
A protruding tubular portion formed by projecting outward from the first member and into which the end portion of the sheathed heater is inserted is provided.
The first member has a part of the end portion joined to the second member with respect to the other portion so that the sheathed heater can be inserted along the longitudinal direction of the protruding cylinder portion. Is a fluid heater characterized by having a recessed recess on the opposite side.
前記第1部材と前記第2部材とが接合される接合部は、前記流路部材の筒軸方向に対して傾斜した平面に沿って配置されること
を特徴とする請求項1に記載の流体加熱器。
The fluid according to claim 1, wherein the joint portion to which the first member and the second member are joined is arranged along a plane inclined with respect to the tubular axis direction of the flow path member. Heater.
前記第1部材と前記第2部材とは突合せ溶接により接合されており、
前記第1部材と前記第2部材との接合部における前記流路部材の内周面に沿って、内径側への溶接ビードの突出を防止する保護部材が設けられること
を特徴とする請求項1又は請求項2に記載の流体加熱器。
The first member and the second member are joined by butt welding.
Claim 1 is characterized in that a protective member is provided along the inner peripheral surface of the flow path member at the joint portion between the first member and the second member to prevent the weld bead from protruding toward the inner diameter side. Alternatively, the fluid heater according to claim 2.
被加熱流体が通流される筒状の流路部材と、
筒状に形成されたシースの内部に発熱線及び絶縁体粉末を収容して構成され、前記流路部材の内径側に配置される中間部及び前記流路部材の外側に突出して配置される端部を有するシーズヒータと
を備える流体加熱器の製造方法であって、
前記流路部材は、筒軸方向に分割して形成された第1部材及び第2部材を有して構成され、
前記第1部材に外側に突き出して形成され前記シーズヒータの前記端部が挿入される突出筒部を取り付ける第1の工程と、
前記シーズヒータの前記端部を前記突出筒部の長手方向に沿って挿入し前記発熱部が前記流路部材の筒軸方向から見たときに前記第1部材の内側となるように配置する第2の工程と、
前記第1部材と前記第2部材とを突き合せた状態で接合する第3の工程と
を有することを特徴とする流体加熱器の製造方法。
A tubular flow path member through which the fluid to be heated flows, and
An intermediate portion arranged on the inner diameter side of the flow path member and an end projecting to the outside of the flow path member, which is formed by accommodating a heating wire and an insulator powder inside the sheath formed in a tubular shape. A method of manufacturing a fluid heater including a sheathed heater having a part.
The flow path member is configured to have a first member and a second member formed by being divided in the tubular axis direction.
A first step of attaching a protruding tubular portion formed to the first member so as to project outward and into which the end portion of the sheathed heater is inserted.
The end portion of the sheathed heater is inserted along the longitudinal direction of the protruding tubular portion, and the heat generating portion is arranged so as to be inside the first member when viewed from the tubular axis direction of the flow path member. Step 2 and
A method for manufacturing a fluid heater, which comprises a third step of joining the first member and the second member in a butted state.
前記第3の工程は、前記第1部材と前記第2部材とを突合せ溶接するものであり、
前記第1部材と前記第2部材との接合部の内径側に溶接ビードが突出することを防止する保護部材を設けた状態で行われること
を特徴とする請求項4に記載の流体加熱器の製造方法。
The third step is to butt-weld the first member and the second member.
The fluid heater according to claim 4, wherein a protective member for preventing the weld bead from protruding is provided on the inner diameter side of the joint between the first member and the second member. Production method.
JP2019057733A 2019-03-26 2019-03-26 FLUID HEATER AND METHOD FOR MANUFACTURING FLUID HEATER Active JP7269624B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000130847A (en) * 1998-10-27 2000-05-12 Sanyo Electric Co Ltd Continuous water heater
JP2005106391A (en) * 2003-09-30 2005-04-21 Noritake Co Ltd Heater to be charged inside passage
JP2007010255A (en) * 2005-07-01 2007-01-18 Matsushita Electric Ind Co Ltd Fluid heating device, and hot water supply device using it
JP2015021669A (en) * 2013-07-19 2015-02-02 株式会社アタゴ製作所 Fluid heating device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000130847A (en) * 1998-10-27 2000-05-12 Sanyo Electric Co Ltd Continuous water heater
JP2005106391A (en) * 2003-09-30 2005-04-21 Noritake Co Ltd Heater to be charged inside passage
JP2007010255A (en) * 2005-07-01 2007-01-18 Matsushita Electric Ind Co Ltd Fluid heating device, and hot water supply device using it
JP2015021669A (en) * 2013-07-19 2015-02-02 株式会社アタゴ製作所 Fluid heating device

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