WO2009096311A1 - 浸漬型ヒータ - Google Patents
浸漬型ヒータ Download PDFInfo
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- WO2009096311A1 WO2009096311A1 PCT/JP2009/050972 JP2009050972W WO2009096311A1 WO 2009096311 A1 WO2009096311 A1 WO 2009096311A1 JP 2009050972 W JP2009050972 W JP 2009050972W WO 2009096311 A1 WO2009096311 A1 WO 2009096311A1
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- cylindrical body
- heating element
- terminal rod
- protective tube
- insulating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/78—Heating arrangements specially adapted for immersion heating
Definitions
- the present invention relates to an immersion heater used in a molten metal heating facility such as an aluminum holding furnace, and more particularly to an immersion heater provided with a metal heating element such as an Fe—Cr—Al alloy.
- Patent Document 1 an insulating cylinder suspended in a bottomed cylindrical ceramic protective tube (dip tube) and a spiral groove formed on the outer peripheral portion of the insulating cylinder are disclosed.
- Each terminal rod having a linear heating element (heating part) having a circular cross section and an insulating lid that closes the opening end of the ceramic protective tube, one end of which is connected to the linear heating element
- An immersion heater is disclosed in which the other end penetrates the insulating lid.
- Patent Document 1 since the immersion heater of Patent Document 1 has a configuration in which an insulating cylindrical body into which a linear heating element is fitted is suspended and held in a protective tube, a belt-like thing wound spirally as a metal heating element is used. The following problems may occur when the spiral heating elements are employed and the flat portions of the belt-like heating elements are opposed to each other.
- the outer peripheral edge of the spirally wound belt-shaped heating element is pressed against the inner wall of the protective tube, and as a result, the heating element is deformed at this pressing portion. Inadequate contact with adjacent heating elements may occur.
- the heating unit is similarly supported by the horizontal cantilever, and the cylindrical body and the heating element are also provided. As a result, the outer peripheral edge of the lower part (furnace floor side) of the spiral heating element is easily pressed against the inner wall of the protective tube, and the possibility of the above-described problems is increased. .
- the present invention provides an immersion heater that can completely prevent the outer peripheral edge of the spiral heating element from being pressed against the inner wall of the protective tube and prevent disconnection due to contact between adjacent heating elements.
- the purpose is to do.
- an immersion heater according to the present invention is formed on a ceramic bottomed protective tube, an insulating cylindrical body inserted into the ceramic bottomed protective tube, and an outer peripheral surface of the insulating cylindrical body.
- One end is connected to each of the metal heating element held in the spiral groove, the insulating lid that closes the opening of the ceramic bottomed protective tube, and the front end and the rear end of the metal heating element.
- the metal heating element has a band shape, and one edge portion of the band metal heating element is inserted and held in the spiral groove to form a spiral heating part,
- a cylindrical body supporting member having a diameter smaller than the inner diameter of the ceramic bottomed protective tube and larger than the outer circumferential diameter of the helical heat generating portion and fitted into the hollow portion of the insulating cylindrical body
- the insulating cylindrical body is arranged in each opening at the front end and the rear end, respectively.
- the temperature of the heating element can be set even at the same output as that of the linear heating element. It can be kept low, and durability is improved by suppressing burnout.
- the cylindrical body supporting members attached to both ends of the cylindrical body that holds the belt-shaped heating element as a spiral heating part are smaller in diameter than the inner diameter of the protective tube and larger in diameter than the outer peripheral diameter of the spiral heating part. Since it has a diameter, a gap is reliably formed between the outer peripheral edge of the belt-like heating element and the inner wall surface of the protective tube, so that the outer peripheral edge of the spiral heat generating portion is prevented from being pressed against the inner wall of the protective tube. As a result, it is possible to reliably avoid disconnection due to contact between adjacent belt-like heating elements without causing deformation due to pressing of the outer peripheral edge of the belt-like heating element.
- the cylindrical support member on the distal end side is connected and fixed to the through hole through which the first terminal rod connected to the distal end portion of the metal heating element penetrates and the distal end of the first terminal rod.
- the through hole through which the first terminal rod passes and the connection plate fixedly connected to the tip of the second terminal rod are inserted through the cutout portion through which the connecting plate is inserted.
- a notch may be formed.
- the connection work between the connection plate and the metal heating element can be easily performed, and the electrical connection can be ensured.
- a space inside the protective tube and between the cylindrical support member on the rear end side and the lid may be filled with a heat insulating material.
- the heat transfer from the spiral heat generating portion to the terminal portion can be suppressed and deformation due to thermal expansion of the terminal rod can be prevented. It is possible to prevent the molten metal from flowing out.
- the outer peripheral portion on the opening end side of the ceramic bottomed protective tube may be formed in a tapered shape that becomes narrower toward the tip.
- the heater side wall is provided with a heater attachment port that engages with the tapered outer peripheral portion. Installation becomes possible.
- the terminal rod fixed to the cylindrical support member on the distal end side so as to be connected to the distal end portion of the metal heating element is supported by the cylindrical body and the rear end side cylindrical body.
- a compression spring may be disposed between the stopper and the stopper provided on the terminal rod outside the lid and extending through the member and the lid.
- the terminal rod connected to the tip of the metal heating element has a pipe shape, and a thermocouple is inserted into the pipe-shaped terminal rod. Good.
- an accurate temperature measurement in a cylindrical body having a heat generating portion can be performed by inserting and arranging a thermocouple in the pipe-shaped terminal rod.
- the end opening of the pipe-shaped terminal rod is filled with a heat insulating material to prevent molten metal from flowing out through the inside of the pipe-shaped terminal rod when the tip of the protective tube is damaged. can do.
- an insulating cylindrical spacer may be disposed between the rear end side cylindrical body supporting member and the lid body in a state where the terminal rod is accommodated.
- one end of the cylindrical spacer is in contact with the cylindrical body support member on the rear end side, and the other end is in contact with the lid body.
- the position of the part can be made exactly constant.
- a plurality of through holes may be formed in the peripheral wall of the insulating cylindrical body.
- the radiant heat of the belt-like heating element is directly applied through the through hole, so that the temperature measurement responsiveness by the thermocouple is improved and the through hole is formed.
- the heat capacity of the cylindrical body holding the heating element is reduced, and the power consumption can be reduced.
- the axial direction sectional view of an immersion type heater The front view and side view of a cover body.
- the side view of the cylindrical body containing a partial cross section.
- FIG. 1 is a longitudinal (axial) sectional view of an immersion heater 1 according to an embodiment of the present invention.
- the end portion on the side inserted into the furnace when the furnace is mounted is referred to as “front end”, and the opposite end portion is referred to as “rear end”.
- the immersion heater 1 includes a protective tube 2 made of ceramic.
- the protective tube 2 is made of a fine ceramic such as silicon nitride, and is formed as a bottomed cylindrical body having a closed end and an open end.
- a taper member 3 is fixed to the outer peripheral portion of the rear end portion of the protective tube 2 so as to form a part of the protective tube 2.
- the taper member 3 is made of ceramic like the protective tube 2 and has an outer peripheral surface that is tapered toward the tip side.
- the outer peripheral taper shape of the taper member 3 corresponds to the taper shape of the inner peripheral surface of the heater attachment port of the furnace side wall (not shown) to which the immersion heater 1 is mounted.
- the tapered outer peripheral surface of the taper member 3 of the protective tube 2 is engaged with the tapered inner peripheral surface of the heater attachment port, whereby the immersion type heater 1. Enables accurate positioning and solid mounting.
- the taper member 3 may be integrally formed with the protective tube 2 in advance.
- the rear end opening of the protective tube 2 is closed by a lid 4 made of an insulating heat insulating material such as a glass fiber reinforced composite material.
- the lid 4 has a small-diameter disk-like insertion portion 4 a inserted into the opening of the protective tube 2 and a large-diameter contacted with the opening edge of the protective tube 2. And a flange portion 4b.
- the lid 4 is formed with through holes 5a and 5b for penetrating terminal rods 12 and 15 to be described later.
- One through hole 5 a is formed at the center of the substantially disc-shaped lid body 4, and the other through hole 5 b is formed near the outer periphery of the lid body 4.
- a cylindrical body 6 made of an insulating heat-resistant material such as ceramic having an alumina content of 90% or more is inserted and disposed in the protective tube 2.
- a spiral groove 7 that continues from the front end to the rear end is formed on the outer peripheral surface of the cylindrical body 6.
- the spiral groove 7 is formed in a tapered shape such that the dimension between both side walls becomes narrower toward the bottom.
- the groove depth H is 4 mm
- the groove width W 1 on the surface side is 2.3 mm
- the groove width W 2 on the bottom side is 1.7 mm
- the groove pitch P is 4.8 mm. It is not limited to these.
- a heating element 8 having a strip shape in the embodiment, a width of 10 mm and a thickness of 1 mm is not limited
- the other edge of the heating element 8 protrudes from the outer peripheral surface of the cylindrical body 6 by about 6 to 7 mm, for example.
- a spiral heat generating portion 9 that is continuous from the front end to the rear end is formed on the outer peripheral portion of the cylindrical body 6.
- the belt-like heating element 8 is previously formed in a spiral shape so that the plane portions face each other, and the tip of the spiral heating element 8 is placed in the spiral groove 7 of the cylindrical body 6.
- the spiral groove 7 is mounted by being positioned and relatively rotated.
- a plurality of through openings 10 are formed on the outer peripheral wall of the cylindrical body 6.
- the through-opening 10 has a substantially elliptical oblong shape, and the three through-openings 10 are arranged in the circumferential direction in a plane perpendicular to the axial direction as shown in the AA cross section and the BB cross section. It is formed at an equal pitch. The reason why the formation position of the through opening 10 is shifted by 60 degrees between the AA cross section and the BB cross section is to suppress a decrease in strength of the cylindrical body 6.
- a plurality of sets of through-openings 10 forming a set of three in the circumferential direction are formed in the axial direction of the cylindrical body 6.
- the radiant heat of the heating element 8 is directly given to the thermocouple 20 disposed inside the cylindrical body 6 through the through openings 10 as will be described later.
- the responsiveness of the temperature measurement by the thermocouple 20 is improved, and the heat capacity of the cylindrical body 6 holding the heating element 8 is reduced by forming the through-opening 10 so that the power consumption can be reduced.
- the shape, size, number, formation position, and the like of the through-opening 10 are not limited to those described above, and can be changed as appropriate.
- a cylindrical body support member 11 made of an insulating material such as ceramic having an alumina content of 70 to 80% is attached to the front and rear ends of the cylindrical body 6.
- the cylindrical body supporting member 11 includes a cylindrical fitting portion 11 a that fits into a hollow portion of the cylindrical body 6 from each end opening of the cylindrical body 6, and the cylindrical body 6.
- the flange portion 11b is in contact with each end face.
- a through hole (insertion port) 12a through which a terminal rod 12 described later is inserted is formed at the center of the cylindrical body support member 11, and a substantially rectangular cutout (insertion port) is formed on the outer peripheral portion of the flange portion 11b. 12b is formed. As shown in FIG.
- a connecting plate 13 of a terminal rod 12 to be described later is inserted into the notch 12 b of the cylindrical body supporting member 11 attached to the tip of the cylindrical body 6, and a cylinder attached to the rear end of the cylindrical body 6.
- a terminal rod 15 described later is inserted into the cutout portion 12 b of the body support member 11.
- each cylindrical body support member 11 attached to the front and rear of the cylindrical body 6 has a diameter that is smaller than the inner diameter of the protective tube 2 and larger than the outer diameter of the helical heat generating portion 9. is doing.
- a gap is reliably formed between the inner peripheral surface of the cylindrical body 6 and the outer peripheral edge of the heat generating portion 9, and the heat generating portion 9 (that is, the belt-shaped heat generating body 8 constituting the heat generating portion 9) is connected to the inner periphery of the protective tube 2. It can be surely prevented from being pressed against the surface.
- a first terminal rod 12 made of, for example, a stainless steel pipe is inserted and arranged along the axis of the immersion heater 1.
- the front end of the first terminal rod 12 is inserted into the through-hole 12a of the cylindrical body support member 11 on the front end side, and the inside of the cylindrical body 6 extends rearward therefrom, so that the cylindrical body support member 11 on the rear end side is extended.
- the through hole 12a and the through hole 5a of the lid 4 are penetrated.
- the first terminal rod 12 has a power supply terminal plate 12 c at the rear end protruding backward from the lid 4. Further, as shown in FIGS.
- a connecting plate 13 having a substantially L-shaped side surface is connected and fixed to the tip of the first terminal rod 12, and the end of the connecting plate 13 is the heating element 8. It is electrically connected to the tip.
- a molten metal is the 1st terminal bar. 12 can be prevented from flowing out through the inside.
- the first terminal rod 12 is housed in the insulating cylindrical spacer 14 between the cylindrical support member 11 on the rear end side and the lid 4.
- the spacer 14 plays a role of regulating the distance between the lid body 4 and the cylindrical body supporting member 11, and thereby the positions of the cylindrical body 6 and the heat generating portion 9 in the protective tube 2 can be made exactly constant. .
- a stopper 18 made of, for example, a metal washer is fixed to the first terminal rod 12, and between the stopper 18 and the lid 4, the first terminal rod 12 A coil spring (compression spring) 19 is mounted on the outer periphery in a compressed state.
- a tensile force is always applied to the first terminal rod 12, and this tensile force acts on the cylindrical body 6 via the pair of front and rear cylindrical body support members 11, 11.
- the cylindrical body 6 can be firmly fixed, and deformation of the first terminal rod 12 due to thermal expansion can be suppressed.
- thermocouple 20 is inserted and arranged inside the pipe-shaped first terminal rod 12.
- the thermocouple 20 is inserted from the rear end portion of the first terminal rod 12, and the front end thereof is located in the cylindrical body 6 that holds the heat generating portion 9. Thereby, accurate temperature measurement in the cylindrical body 6 having the heat generating portion 9 becomes possible.
- the first terminal rod 12 may be a solid rod.
- a second terminal rod 15 made of, for example, a stainless steel rod is inserted and disposed.
- the second terminal rod 15 passes through the through hole 5b of the lid 4 and is inserted into the notch 12b of the cylindrical body support member 11 on the rear end side, and is connected to the front end thereof as shown in FIG. 5B.
- the plate 15a is electrically connected to the rear end portion of the belt-like heating element 8.
- the second terminal rod 15 has a power supply terminal plate 15b at the rear end.
- a space between the cylindrical body support member 11 and the lid body 4 on the rear end side inside the protective tube 2 is filled with, for example, a heat insulating material 16 made of ceramic fiber.
- the submerged heater 1 having the above configuration is attached to the furnace side wall of an aluminum holding furnace, for example, and immersed in a molten aluminum (molten metal) via the first and second terminal rods 12 and 15.
- the molten metal can be maintained at a desired temperature by supplying power and generating heat in the heat generating portion 9.
- the surface area of the heating element 8 can be increased by adopting a belt-like heating element 8 as compared with the linear heating element. Even at the same output, the temperature of the heating element 8 can be kept low, and durability is improved by suppressing burn-out.
- the cylindrical body supporting members 11 attached to both ends of the cylindrical body 6 that holds the belt-shaped heating body 8 as the spiral heating section 9 are smaller in diameter than the inner diameter of the protective tube 2 and the outer diameter of the spiral heating section 9. Since the gap is surely formed between the outer peripheral edge of the belt-like heating element 8 and the inner wall surface of the protective tube 2, the outer peripheral edge of the spiral heat generating portion 9 is the protective tube. 2 can be avoided, and as a result, the deformation due to the pressing of the outer peripheral edge of the belt-like heating element 8 does not occur, and the disconnection due to the contact between adjacent belt-like heating elements 8 is surely avoided. be able to.
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Abstract
Description
前記金属発熱体が帯状をなしており、この帯状金属発熱体の一方のエッジ部が前記螺旋溝内に挿入保持されて螺旋状の発熱部を形成し、
前記セラミック製有底保護管の内径より小径で、かつ、螺旋状の発熱部の外周径よりも大径である径を有するとともに前記絶縁性円筒体の中空部に嵌合する円筒体支持部材が前記絶縁性円筒体の先端および後端の各開口にそれぞれ配置されている、ことを特徴とするものである。
また、帯状発熱体を螺旋状の発熱部として保持する円筒体の両端に取り付けられた円筒体支持部材が保護管内径より小径で、かつ、螺旋状の発熱部の外周径よりも大径である径を有することから、帯状発熱体の外周縁と保護管の内壁面との間に隙間が確実に形成されるため、螺旋状発熱部の外周縁が保護管の内壁に押圧されることを回避することができ、その結果、帯状発熱体の外周縁の押圧による変形が生じることなく、隣接する帯状発熱体同士の接触による断線を確実に回避することができる。
この場合、前記パイプ状の端子棒の先端開口に断熱材が充填されることで、保護管の先端部の破損時、溶融金属がパイプ状端子棒の内部を通って外部に流出することを防止することができる。
2…保護管
3…テーパ部材
4…蓋体
6…円筒体
7…螺旋溝
8…発熱体
9…発熱部
10…貫通開口
11…円筒体支持部材
12…第1端子棒
13…接続板
14…スペーサ
15…第2端子棒
16…充填材
18…止め金具
19…コイルばね(圧縮ばね)
20…熱電対
図1は、本発明の一実施形態である浸漬型ヒータ1の長手方向(軸方向)断面図である。なお、浸漬型ヒータ1を説明するにおいて、便宜上、炉装着時に炉内に挿入される側の端部を「先端」、その反対側端部を「後端」という。
なお、帯状の発熱体8は、図3Cに示すように、予め平面部が互いに対向するように螺旋状に形成され、この螺旋状の発熱体8の先端を円筒体6の螺旋溝7内に位置させ、相対的に回転させることで螺旋溝7に装着する。
また、帯状発熱体8を螺旋状の発熱部9として保持する円筒体6の両端に取り付けられた円筒体支持部材11が保護管2の内径より小径で、かつ、螺旋状発熱部9の外周径よりも大径である径を有することから、帯状発熱体8の外周縁と保護管2の内壁面との間に隙間が確実に形成されるため、螺旋状発熱部9の外周縁が保護管2の内壁に押圧されることを回避することができ、その結果、帯状発熱体8の外周縁の押圧による変形が生じることなく、隣接する帯状発熱体8同士の接触による断線を確実に回避することができる。
Claims (9)
- セラミック製有底保護管と、前記セラミック製有底保護管内に挿入された絶縁性円筒体と、前記絶縁性円筒体の外周面に形成した螺旋溝内に保持された金属発熱体と、前記セラミック製有底保護管の開口部を塞ぐ絶縁性蓋体と、前記金属発熱体の先端部と後端部とに一方端部がそれぞれ接続されるとともに他方端部が前記絶縁性蓋体を貫通して前記セラミック製有底保護管外に位置している第1、第2端子棒と
からなる浸漬型ヒータにおいて、
前記金属発熱体が帯状をなしており、この帯状金属発熱体の一方のエッジ部が前記螺旋溝内に挿入保持されて螺旋状の発熱部を形成し、
前記セラミック製有底保護管の内径より小径で、かつ、螺旋状の発熱部の外周径よりも大径である径を有するとともに前記絶縁性円筒体の中空部に嵌合する円筒体支持部材が前記絶縁性円筒体の先端および後端の各開口にそれぞれ配置されていることを特徴とする浸漬型ヒータ。 - 前記先端側の円筒体支持部材に前記金属発熱体の先端部に接続される前記第1端子棒が貫通する貫通孔とこの第1端子棒の先端に連結固定された接続板が挿通する切欠部を、また、前記後端側の円筒体支持部材に前記第1端子棒が貫通する貫通孔と前記第2端子棒の先端に連結固定された接続板が挿通する切欠部を形成したことを特徴とする請求項1に記載の浸漬型ヒータ。
- 前記保護管内部であって、前記後端側の円筒体支持部材と前記蓋体との間の空間に断熱材が充填されることを特徴とする請求項1または2に記載の浸漬型ヒータ。
- 前記セラミック製有底保護管の開口端部側の外周部が、先端に向かって細くなるテーパ形状に形成されていることを特徴とする請求項1ないし3のいずれかに記載の浸漬型ヒータ。
- 前記金属発熱体の先端部に接続されるように前記先端側の円筒体支持部材に固定された前記端子棒が前記円筒体、前記後端側の円筒体支持部材および前記蓋体を貫通して延伸し、前記蓋体の外部において前記端子棒に設けられた止め金具と前記蓋体との間に圧縮ばねが配置されていることを特徴とする請求項1ないし4のいずれかに記載の浸漬型ヒータ。
- 前記金属発熱体の先端部に接続される前記端子棒がパイプ状をなし、かつ、熱電対が前記パイプ状の端子棒内に挿入配置されることを特徴とする請求項1ないし5のいずれかに記載の浸漬型ヒータ。
- 前記パイプ状の端子棒の先端開口に断熱材が充填されることを特徴とする請求項6に記載の浸漬型ヒータ。
- 絶縁性円筒状スペーサが前記端子棒を収納した状態で前記後端側の円筒体支持部材と前記蓋体との間に配置されていることを特徴とする請求項1ないし7のいずれかに記載の浸漬型ヒータ。
- 前記絶縁性円筒体の周壁に複数の貫通開口が形成されていることを特徴とする請求項1ないし8のいずれかに記載の浸漬型ヒータ。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/864,118 US8422871B2 (en) | 2008-01-29 | 2009-01-22 | Immersion heater |
JP2009551486A JP5371784B2 (ja) | 2008-01-29 | 2009-01-22 | 浸漬型ヒータ |
CN200980103393.6A CN101953226B (zh) | 2008-01-29 | 2009-01-22 | 浸渍型加热器 |
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JP2008-017579 | 2008-01-29 | ||
JP2008017579 | 2008-01-29 |
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WO2009096311A1 true WO2009096311A1 (ja) | 2009-08-06 |
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PCT/JP2009/050972 WO2009096311A1 (ja) | 2008-01-29 | 2009-01-22 | 浸漬型ヒータ |
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US (1) | US8422871B2 (ja) |
JP (1) | JP5371784B2 (ja) |
CN (1) | CN101953226B (ja) |
WO (1) | WO2009096311A1 (ja) |
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Also Published As
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US20100290766A1 (en) | 2010-11-18 |
CN101953226B (zh) | 2014-01-01 |
US8422871B2 (en) | 2013-04-16 |
CN101953226A (zh) | 2011-01-19 |
JPWO2009096311A1 (ja) | 2011-05-26 |
JP5371784B2 (ja) | 2013-12-18 |
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