JP6857144B2 - How to maintain the function of the immersion heater - Google Patents

How to maintain the function of the immersion heater Download PDF

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JP6857144B2
JP6857144B2 JP2018041741A JP2018041741A JP6857144B2 JP 6857144 B2 JP6857144 B2 JP 6857144B2 JP 2018041741 A JP2018041741 A JP 2018041741A JP 2018041741 A JP2018041741 A JP 2018041741A JP 6857144 B2 JP6857144 B2 JP 6857144B2
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司 岸村
司 岸村
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Sanken Sangyo Co Ltd
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本発明は、ヒータ本体を構成する保護管に発熱体及び配線端子から発熱体に電流を流す導電体を内蔵し、前記保護管と発熱体との間に熱伝導を目的とする粉体を充填した浸漬ヒータの機能維持方法に関するものである。 In the present invention, a heating element and a conductor for passing an electric current from a wiring terminal to the heating element are built in a protective tube constituting the heater main body, and a powder for heat conduction is filled between the protective tube and the heating element. The present invention relates to a method for maintaining the function of the immersion heater.

溶解または温度保持に使用される溶湯を加熱する浸漬ヒータには、ヒータ本体を構成する保護管に発熱体を内蔵し、その保護管と発熱体との間に、セラミックフィラーなどの粉体の充填を提案したものがある(例えば、特許文献1参照)。
また、セラミックフィラーは発熱体のみならず、導電体まで充填されている場合もある。
この浸漬ヒータは粉体を充填することによって高い熱伝導性を確保し、加熱効果を高めることができるといった特長がある。
The immersion heater that heats the molten metal used for melting or maintaining the temperature has a heating element built into the protective tube that constitutes the heater body, and a powder such as a ceramic filler is filled between the protective tube and the heating element. (See, for example, Patent Document 1).
Further, the ceramic filler may be filled not only with a heating element but also with a conductor.
This immersion heater has a feature that high thermal conductivity can be ensured and the heating effect can be enhanced by filling with powder.

特開2017−79149号公報JP-A-2017-79149

しかしながら、保護管と発熱体の間に粉体を充填した上記の浸漬ヒータは、発熱体や導電体の表面が酸化するとその摩擦係数が大きくなり、浸漬ヒータの温度変化による熱膨張や熱収縮が抑制されて大きな応力が発熱体や導電体に作用し、その結果、発熱体や導電体が破損してしまうことがある。また、粉体が酸化する性質を持っていると、その酸化によって絶縁抵抗値が低下するため、漏電の危険性がある。 However, in the above immersion heater in which powder is filled between the protective tube and the heating element, the friction coefficient increases when the surface of the heating element or conductor oxidizes, causing thermal expansion and contraction due to temperature changes of the immersion heater. It is suppressed and a large stress acts on the heating element or the conductor, and as a result, the heating element or the conductor may be damaged. Further, if the powder has a property of oxidizing, the insulation resistance value decreases due to the oxidation, and there is a risk of electric leakage.

こうした発熱体や導電体の酸化による破損も、粉体の酸化による漏電も、浸漬ヒータの内部に侵入している酸素が原因である。従来、酸素の侵入を防止するためにシール材を設けているが、当初から侵入して残存する酸素や、シール材の漏れによって新たに侵入した酸素を除去する手段がなく、これら酸素による酸化を防止することができなかった。 Both the damage caused by the oxidation of the heating element and the conductor and the electric leakage caused by the oxidation of the powder are caused by the oxygen entering the inside of the immersion heater. Conventionally, a sealing material is provided to prevent the invasion of oxygen, but there is no means to remove the oxygen that has invaded and remains from the beginning and the oxygen that has newly entered due to the leakage of the sealing material, and oxidation by these oxygens is performed. Could not be prevented.

そこで、本発明の目的とするところは、浸漬ヒータの内部に侵入した酸素を除去することによって、発熱体や導電体の破損や漏電の発生といった機能の低下を未然に防止し、浸漬ヒータの機能を本来のものに維持する方法を提供することにある。 Therefore, an object of the present invention is to remove oxygen that has entered the inside of the immersion heater to prevent deterioration of functions such as damage to the heating element and the conductor and occurrence of electric leakage, and to prevent the function of the immersion heater. Is to provide a way to keep the original.

上記の目的を達成するために、本発明の浸漬ヒータの機能維持方法は、溶解または温度保持に使用される溶湯に浸漬して前記溶湯を加熱する浸漬ヒータ(10)でそのヒータ本体(11)を構成する保護管(12)には発熱体(13)及び導電体(19)が内蔵されるとともに前記保護管(12)と、発熱体(13)及び導電体(19)との間で、発熱体(13)及び導電体(19)の内周側及外周側に熱伝導を目的とした粉体(14)が充填されてなる前記浸漬ヒータの機能維持方法において、
前記ヒータ本体(11)の内部の空気を、真空ポンプ(21)を利用して吸い出した後、前記保護管(12)と、発熱体(13)及び導電体(19)との間に不活性ガスを不活性ガス供給部(22)によって充満させるもので、
前記真空ポンプ(21)及び不活性ガス供給部(22)は着脱自在に接続部(15)に取り付けられ、前記浸漬ヒータ(10)は、前記接続部(15)より下位において、溶解または保持炉(30)の上壁(31)に取り付けられ、
前記ヒータ本体(10)の上端部に、前記ヒータ本体(10)の内部を密封するシール材(16)を設けるとともに、前記シール材(16)より下側でかつ前記上壁(31)より上側の位置で、前記ヒータ本体(10)の上部下端で粉体(14)が充填されている部分の上端に補助シール(17)を設けたことを特徴とする。
In order to achieve the above object, the method for maintaining the function of the immersion heater of the present invention is a immersion heater (10) that heats the molten metal by immersing it in a molten metal used for melting or maintaining the temperature. A heating element (13) and a conductor (19) are built in the protective tube (12) constituting the protective tube (12), and between the protective tube (12) and the heating element (13) and the conductor (19) . In the method for maintaining the function of the immersion heater, in which the inner peripheral side and the outer peripheral side of the heating element (13) and the conductor (19 ) are filled with powder (14) for the purpose of heat conduction.
After sucking out the air inside the heater body (11) using the vacuum pump (21), it is inactive between the protective tube (12) and the heating element (13) and the conductor (19). The gas is filled by the inert gas supply unit (22) .
The vacuum pump (21) and the inert gas supply unit (22) are detachably attached to the connection unit (15), and the immersion heater (10) is located below the connection unit (15) in a melting or holding furnace. Attached to the upper wall (31) of (30),
A sealing material (16) for sealing the inside of the heater body (10) is provided at the upper end of the heater body (10), and is below the sealing material (16) and above the upper wall (31). At the position of, an auxiliary seal (17) is provided at the upper and lower ends of the upper and lower ends of the heater main body (10) where the powder (14) is filled .

また、本発明の浸漬ヒータの機能維持方法は、溶解または温度保持に使用される溶湯に浸漬して前記溶湯を加熱する浸漬ヒータ(10)でそのヒータ本体(11)を構成する保護管(12)には発熱体(13)及び導電体(19)が内蔵されるとともに前記保護管(12)と、発熱体(13)及び導電体(19)との間に熱伝導を目的とした粉体(14)が充填されてなる前記浸漬ヒータの機能維持方法において、
前記ヒータ本体(11)の内部の空気を、真空ポンプ(21)を利用して吸い出した後、前記保護管(12)と、発熱体(13)及び導電体(19)との間に不活性ガスを不活性ガス供給部(22)によって充満させるもので、
前記真空ポンプ(21)及び不活性ガス供給部(22)は着脱自在に接続部(15)に取り付けられ、前記浸漬ヒータ(10)は、前記接続部(15)より下位において、溶解または保持炉(30)の上壁(31)に取り付けられ、
前記ヒータ本体(10)の上端部に、前記ヒータ本体(10)の内部を密封するシール材(16)を設けるとともに、前記シール材(16)より下側でかつ前記上壁(31)より上側の位置で、前記ヒータ本体(10)の上部下端で粉体(14)が充填されている部分の上端に補助シール(17)を設けたことを特徴とする。
Further, in the method for maintaining the function of the immersion heater of the present invention, the protection tube (12) constituting the heater main body (11) by the immersion heater (10) that heats the molten metal by immersing it in the molten metal used for melting or maintaining the temperature. ) Built a heating element (13) and a conductor (19), and a powder for heat conduction between the protective tube (12) and the heating element (13) and the conductor (19). In the method for maintaining the function of the immersion heater filled with (14),
After sucking out the air inside the heater body (11) using the vacuum pump (21), it is inactive between the protective tube (12) and the heating element (13) and the conductor (19). The gas is filled by the inert gas supply unit (22).
The vacuum pump (21) and the inert gas supply unit (22) are detachably attached to the connection unit (15), and the immersion heater (10) is located below the connection unit (15) in a melting or holding furnace. Attached to the upper wall (31) of (30),
A sealing material (16) for sealing the inside of the heater body (10) is provided at the upper end of the heater body (10), and is below the sealing material (16) and above the upper wall (31). At the position of, an auxiliary seal (17) is provided at the upper and lower ends of the upper and lower ends of the heater body (10) where the powder (14) is filled .

ここで、上記括弧内の記号は、図面および後述する発明を実施するための形態に掲載された対応要素または対応事項を示す。 Here, the symbols in parentheses indicate the corresponding elements or corresponding items described in the drawings and the embodiment for carrying out the invention described later.

本発明の浸漬ヒータの機能維持方法によれば、ヒータ本体を構成する保護管と、発熱体や導電体との間に不活性ガスを充満させるので、その部分に残存している酸素を追い出し、あるいはその割合を小さくすることができる。
これにより、発熱体や導電体の酸化を防止又は抑制して、酸化による破損を防止することができる。また、粉体の酸化を抑制して、漏電の発生を防止することができる。なお、不活性ガスは、化学反応を起こし難い気体であるため、保護管及び発熱体に何ら悪影響を及ぼさない。
According to the method for maintaining the function of the immersion heater of the present invention, the inert gas is filled between the protective tube constituting the heater body and the heating element or the conductor, so that the oxygen remaining in the portion is expelled. Alternatively, the ratio can be reduced.
Thereby, oxidation of the heating element and the conductor can be prevented or suppressed, and damage due to oxidation can be prevented. In addition, it is possible to suppress the oxidation of the powder and prevent the occurrence of electric leakage. Since the inert gas is a gas that does not easily cause a chemical reaction, it does not have any adverse effect on the protective tube and the heating element.

また、本発明の浸漬ヒータの機能維持方法によれば、ヒータ本体の内部の空気(従って酸素)を吸い出した後、不活性ガスを充満させるので、ヒータ本体の内部から酸素を完全に除去することができる。
これにより、発熱体や導電体の酸化及びそれによる破損を確実に防止することができる。また、粉体の酸化及びそれによる漏電の発生を確実に防止することができる。
Further, according to the method for maintaining the function of the immersion heater of the present invention, since the air (and therefore oxygen) inside the heater body is sucked out and then the inert gas is filled, oxygen is completely removed from the inside of the heater body. Can be done.
This makes it possible to reliably prevent oxidation of the heating element and the conductor and damage caused by the oxidation. In addition, it is possible to reliably prevent the oxidation of the powder and the occurrence of electric leakage due to the oxidation.

また、本発明のヒータの機能維持方法によれば、ヒータ本体の内部の空気の吸い出しを、真空ポンプを利用して行い、不活性ガスの充満を、不活性ガス供給部によって行うので、空気の吸い出し及び不活性ガスの充満を確実に行うことができる。
これにより、発熱体や導電体の破損及び漏電の発生を、より確実に防止することができる。
Further, according to the method for maintaining the function of the heater of the present invention, the air inside the heater body is sucked out by using a vacuum pump, and the inert gas is filled by the inert gas supply unit. The suction and the filling of the inert gas can be surely performed.
This makes it possible to more reliably prevent damage to the heating element and the conductor and the occurrence of electric leakage.

さらに、本発明のヒータの機能維持方法によれば、ヒータ本体の上端部に、ヒータ本体の内部を密封するシール材を設けたので、ヒータ本体の内部への空気(酸素)の侵入を防止することができる。
これにより、発熱体や導電体の破損及び漏電の発生を、さらに確実に防止することができる。
Further, according to the method for maintaining the function of the heater of the present invention, a sealing material for sealing the inside of the heater body is provided at the upper end of the heater body, so that air (oxygen) is prevented from entering the inside of the heater body. be able to.
This makes it possible to more reliably prevent damage to the heating element and the conductor and the occurrence of electric leakage.

本発明の実施形態に係る浸漬ヒータの機能維持方法に使用する浸漬ヒータ及び脱酸素機構を示す正面構成図である。It is a front view which shows the immersion heater and the deoxidizing mechanism used in the function maintenance method of the immersion heater which concerns on embodiment of this invention. 図1に示す浸漬ヒータの要部拡大図である。It is an enlarged view of the main part of the immersion heater shown in FIG.

図1及び図2を参照して、本発明の実施形態に係る浸漬ヒータの機能維持方法を説明する。図1は、本実施形態に係る浸漬ヒータの機能維持方法に使用する浸漬ヒータ及び脱酸素機構を示す正面構成図であり、図2は、図1に示す浸漬ヒータの要部拡大図である。 A method of maintaining the function of the immersion heater according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a front configuration view showing the immersion heater and the deoxidizing mechanism used in the method for maintaining the function of the immersion heater according to the present embodiment, and FIG. 2 is an enlarged view of a main part of the immersion heater shown in FIG.

本実施形態に係る浸漬ヒータの機能維持方法の対象は、例えば、アルミニウムなどの非鉄金属の溶湯に浸漬して、その非鉄金属を加熱処理するために使用される電気式の浸漬ヒータ10である。この浸漬ヒータ10のヒータ本体11の一部を構成する保護管12には発熱体13と、配線端子から発熱体13に電流を流す導電体19が内蔵されている。そして、保護管12と、発熱体13及び導電体19との間には、熱伝導を目的とした粉体14が充填されている。 The target of the method for maintaining the function of the immersion heater according to the present embodiment is, for example, an electric immersion heater 10 used for immersing in a molten metal of a non-ferrous metal such as aluminum and heat-treating the non-ferrous metal. The protective tube 12 that forms part of the heater body 11 of the immersion heater 10 contains a heating element 13 and a conductor 19 that allows a current to flow from the wiring terminal to the heating element 13. Then, a powder 14 for the purpose of heat conduction is filled between the protective tube 12, the heating element 13 and the conductor 19.

保護管12は底部が閉塞した長尺チューブ状であり、高純度の窒化ケイ素系セラミックスで構成される。この材料は溶湯Y(溶解アルミニウム)が付着し難く、付着しても離れ易いという性質がある。発熱体13は三相または単相の相数並びに出力容量に応じて1〜6つ設けられ、共に、金属製で、丸線螺旋形状を有し、保護管12の底部付近まで達する長さを有する。粉体14は、ヒータ本体11の上部を除く部分に充填されており、限定されるものではないが、窒化ホウ素粉末などの熱伝導性に優れる粉末材を使用するのが好ましい。 The protective tube 12 has a long tube shape with a closed bottom, and is made of high-purity silicon nitride-based ceramics. This material has the property that the molten metal Y (dissolved aluminum) does not easily adhere to it, and even if it adheres, it easily separates. The heating element 13 is provided with 1 to 6 depending on the number of three-phase or single-phase phases and the output capacity, both of which are made of metal, have a round wire spiral shape, and have a length reaching near the bottom of the protective tube 12. Have. The powder 14 is filled in a portion other than the upper part of the heater main body 11, and is not limited, but it is preferable to use a powder material having excellent thermal conductivity such as boron nitride powder.

また、本実施形態における浸漬ヒータ10は、ヒータ本体11の上部に、後述する真空ポンプ21及び不活性ガス供給部22を着脱自在に取り付ける接続部15を備える。この真空ポンプ21と不活性ガス供給部22は一体的に組み付けられて脱酸素機構20を形成し、真空ポンプ21と不活性ガス供給部22を、浸漬ヒータ10の接続部15に着脱自在に組み付ける着脱部23を介して、切り換え式に接続する。この脱酸素機構20は、真空ポンプ21、不活性ガス供給部22及び着脱部23の他に、真空ポンプ21に連結された第一バルブ24と、不活性ガス供給部22に直列に連結された減圧弁26及び第二バルブ25を備える。 Further, the immersion heater 10 in the present embodiment includes a connecting portion 15 to which the vacuum pump 21 and the inert gas supply portion 22, which will be described later, are detachably attached to the upper part of the heater main body 11. The vacuum pump 21 and the inert gas supply unit 22 are integrally assembled to form a deoxidizing mechanism 20, and the vacuum pump 21 and the inert gas supply unit 22 are detachably assembled to the connection portion 15 of the immersion heater 10. It is connected in a switchable manner via the detachable portion 23. The deoxidizing mechanism 20 is connected in series with the first valve 24 connected to the vacuum pump 21 and the inert gas supply unit 22 in addition to the vacuum pump 21, the inert gas supply unit 22 and the attachment / detachment unit 23. A pressure reducing valve 26 and a second valve 25 are provided.

また、この浸漬ヒータ10は、それを溶解または保持炉30の上壁31に取り付けるため、その構成部材である取付けフランジ18を接続部15の下位に備える。なお、ヒータ本体11の上端部には、ヒータ本体11の内部を密封するシール材16を設けている。また、ヒータ本体11の上部下端であり、粉体14が充填されている部分の上端には、シール性を確保するための補助シール17を設けている。 Further, in order to attach the immersion heater 10 to the upper wall 31 of the melting or holding furnace 30, the immersion heater 10 is provided with a mounting flange 18 which is a constituent member thereof below the connecting portion 15. A sealing material 16 for sealing the inside of the heater main body 11 is provided at the upper end of the heater main body 11. Further, an auxiliary seal 17 for ensuring the sealing property is provided at the upper and lower ends of the heater main body 11 and at the upper end of the portion filled with the powder 14.

本実施形態の浸漬ヒータの機能維持方法は、次のように実施することができる。なお、この方法は、浸漬ヒータ10を溶解または保持炉30の上壁31に最初に取付けた際に行うことができるし、また、溶解または保持炉30に取付けた後、浸漬ヒータ10を実際に使用した後に行うこともできる。 The method for maintaining the function of the immersion heater of the present embodiment can be carried out as follows. This method can be performed when the immersion heater 10 is first attached to the upper wall 31 of the melting or holding furnace 30, and after the immersion heater 10 is attached to the melting or holding furnace 30, the immersion heater 10 is actually attached. It can also be done after use.

後者の場合、浸漬ヒータの使用による温度上昇に伴い、浸漬ヒータの内部圧力が上昇して不活性ガスが漏れる場合があるが、その場合、脱酸素機構20によって浸漬ヒータの内部に不活性ガスを再度充満させておくことにより、その後の浸漬ヒータの温度低下による外気(酸素)の吸い込みを未然に防止することができる。 In the latter case, the internal pressure of the immersion heater may rise and the inert gas may leak as the temperature rises due to the use of the immersion heater. In that case, the deoxidizing mechanism 20 causes the inert gas to be inside the immersion heater. By refilling the gas, it is possible to prevent the inhalation of outside air (oxygen) due to the subsequent decrease in the temperature of the immersion heater.

この浸漬ヒータの機能維持方法はまず、溶解または保持炉30の上壁31に取付けられた浸漬ヒータ10の接続部15に、脱酸素機構20の着脱部23を組付ける。次に、第一バルブ24を開放した状態で、脱酸素機構20の真空ポンプ21を作動してヒータ本体11の内部の空気(酸素)を吸い出し、その後、真空ポンプ21を停止すると共に第一バルブ24を閉じる。これにより、ヒータ本体11の内部を真空状態とする。 In this method of maintaining the function of the immersion heater, first, the attachment / detachment portion 23 of the deoxidizing mechanism 20 is attached to the connection portion 15 of the immersion heater 10 attached to the upper wall 31 of the melting or holding furnace 30. Next, with the first valve 24 open, the vacuum pump 21 of the deoxidizing mechanism 20 is operated to suck out the air (oxygen) inside the heater body 11, and then the vacuum pump 21 is stopped and the first valve is stopped. Close 24. As a result, the inside of the heater main body 11 is evacuated.

次に、第二バルブ25を開放状態とした後、不活性ガス供給部22から不活性ガスを、着脱部23を介してヒータ本体11の内部に送り、ヒータ本体11の内部、すなわち保護管12と、発熱体13及び導電体19との間に不活性ガスを充満させる。
これにより、ヒータ本体11の内部に酸素を残存あるいは侵入させず、あるいは残存する酸素の濃度を極めて低く維持することができる。なお、この不活性ガスの種類は限定されるものではないが、窒素ガスやアルゴンガスなどが好適である。
Next, after the second valve 25 is opened, the inert gas is sent from the inert gas supply unit 22 to the inside of the heater main body 11 via the attachment / detachment unit 23, and the inside of the heater main body 11, that is, the protective tube 12 And the heating element 13 and the conductor 19 are filled with an inert gas.
As a result, oxygen does not remain or penetrate inside the heater main body 11, or the concentration of residual oxygen can be maintained extremely low. The type of the inert gas is not limited, but nitrogen gas, argon gas, or the like is preferable.

不活性ガスを充満させた後、不活性ガス供給部22を停止すると共に、第二バルブ25を閉じる。これにより、ヒータ本体11の内部に空気(酸素)の残存しない環境を形成する。なお、減圧弁26は、ヒータ本体11に送る不活性ガスの圧力を調整するために適宜操作する。 After filling with the inert gas, the inert gas supply unit 22 is stopped and the second valve 25 is closed. As a result, an environment in which air (oxygen) does not remain is formed inside the heater main body 11. The pressure reducing valve 26 is appropriately operated to adjust the pressure of the inert gas sent to the heater main body 11.

ヒータ本体11の内部に空気(酸素)の残存しない環境を形成した後、脱酸素機構20の着脱部23を浸漬ヒータ10の接続部15から取り外して、脱酸素機構20を浸漬ヒータ10から離脱することにより、浸漬ヒータの機能維持方法を完了する。 After forming an environment in which air (oxygen) does not remain inside the heater main body 11, the attachment / detachment portion 23 of the deoxidizing mechanism 20 is removed from the connecting portion 15 of the immersion heater 10, and the deoxidizing mechanism 20 is separated from the immersion heater 10. This completes the method of maintaining the function of the immersion heater.

本実施形態に係る浸漬ヒータの機能維持方法によれば、脱酸素機構20の真空ポンプ21によってヒータ本体11の内部の空気を吸い出した後、その不活性ガス供給部22によって不活性ガスを充満させるので、ヒータ本体11の内部から酸素を完全に除去することができる。また、ヒータ本体11の内部を不活性ガスで充満させているので、その内部への空気(酸素)の侵入を遮断することができる。これにより、発熱体13や導電体19の酸化及びそれによる破損を確実に防止することができる。また、粉体14の酸化及びそれによる漏電の発生も確実に防止することができる。 According to the method for maintaining the function of the immersion heater according to the present embodiment, the air inside the heater main body 11 is sucked out by the vacuum pump 21 of the deoxidizing mechanism 20, and then the inert gas is filled by the inert gas supply unit 22. Therefore, oxygen can be completely removed from the inside of the heater main body 11. Further, since the inside of the heater main body 11 is filled with the inert gas, the invasion of air (oxygen) into the inside can be blocked. As a result, oxidation of the heating element 13 and the conductor 19 and damage caused by the oxidation can be reliably prevented. Further, it is possible to surely prevent the oxidation of the powder 14 and the occurrence of electric leakage due to the oxidation.

また、ヒータ本体11の内部の空気の吸い出しを、脱酸素機構20の真空ポンプ21を使用して機械的かつ強制的行い、不活性ガスの充満を、その不活性ガス供給部22によって、同様に機械的かつ強制的に行うので、空気の吸い出し及び不活性ガスの充満を常に確実に行うことができる。これにより、発熱体13や導電体19の破損及び漏電の発生を、より確実に防止することができる。 Further, the air inside the heater main body 11 is sucked out mechanically and forcibly by using the vacuum pump 21 of the deoxidizing mechanism 20, and the inert gas is filled by the inert gas supply unit 22 in the same manner. Since it is mechanically and forcibly performed, air can be sucked out and the inert gas can be filled with certainty at all times. As a result, damage to the heating element 13 and the conductor 19 and the occurrence of electric leakage can be prevented more reliably.

さらに、本実施形態のヒータの修復方法によれば、ヒータ本体11の上端部にヒータ本体11の内部を密封するシール材16を設けると共に、シール本体の粉体14を充填した部分の上端に補助シール17を設けたので、ヒータ本体11の内部及びヒータ本体11の粉体14が充填する部分への空気(酸素)の侵入を確実に防止することができる。これにより、発熱体13や導電体19の酸化による破損と、粉体14の酸化による漏電の発生を、さらに確実に防止することができる。 Further, according to the heater repair method of the present embodiment, a sealing material 16 for sealing the inside of the heater main body 11 is provided at the upper end portion of the heater main body 11, and an auxiliary is provided at the upper end of the portion filled with the powder 14 of the sealing main body. Since the seal 17 is provided, it is possible to reliably prevent air (oxygen) from entering the inside of the heater main body 11 and the portion of the heater main body 11 filled with the powder 14. As a result, it is possible to more reliably prevent damage due to oxidation of the heating element 13 and the conductor 19 and generation of electric leakage due to oxidation of the powder 14.

なお、上記実施形態では、ヒータ本体11の内部の空気の吸い出しを真空ポンプ21で行い、不活性ガスの充満を不活性ガス供給部22で機械的に行っているが、これに限定されるものではなく、例えば、他の機械的な吸引手段を使用することもできるし、脱酸素剤などの化学物質を使用した化学的な手法によって行うことも可能である。 In the above embodiment, the vacuum pump 21 sucks out the air inside the heater main body 11, and the inert gas supply unit 22 mechanically fills the inert gas, but the present invention is limited to this. Instead, for example, other mechanical suction means can be used, or it can be done by a chemical method using a chemical substance such as a deoxidizer.

また、上記実施形態では、ヒータ本体11の内部の空気を吸い出した後に、不活性ガスを充満させているが、これに限定されず、不活性ガスを充満させることにより、その不活性ガスの圧力で空気を追い出すこともできる。この場合、真空ポンプ21は不要となる。 Further, in the above embodiment, after sucking out the air inside the heater main body 11, the inert gas is filled, but the present invention is not limited to this, and the pressure of the inert gas is increased by filling the inert gas. You can also expel the air with. In this case, the vacuum pump 21 becomes unnecessary.

さらに、上記実施形態の対象である浸漬ヒータ10は、シール材16と補助シール17を使用しているが、これらシール材16と補助シール17を使用しない構成とすることも可能である。 Further, although the immersion heater 10 which is the target of the above embodiment uses the sealing material 16 and the auxiliary seal 17, it is also possible to configure the immersion heater 10 so as not to use the sealing material 16 and the auxiliary seal 17.

10 浸漬ヒータ
11 ヒータ本体
12 保護管
13 発熱体
14 粉体
15 接続部
16 シール材
17 補助シール
18 取付けフランジ
19 導電体
20 脱酸素機構
21 真空ポンプ
22 不活性ガス供給部
23 着脱部
24 第一バルブ
25 第二バルブ
26 減圧弁
30 保持炉
31 上壁
10 Immersion heater 11 Heater body 12 Protective tube 13 Heater 14 Powder 15 Connection part 16 Sealing material 17 Auxiliary seal 18 Mounting flange 19 Conductor 20 Deoxidizing mechanism 21 Vacuum pump 22 Inert gas supply part 23 Detachable part 24 First valve 25 Second valve 26 Pressure reducing valve 30 Holding furnace 31 Upper wall

Claims (2)

溶解または温度保持に使用される溶湯に浸漬して前記溶湯を加熱する浸漬ヒータでそのヒータ本体を構成する保護管には発熱体及び導電体が内蔵されるとともに前記保護管と、発熱体及び導電体との間で、発熱体及び導電体の内周側及外周側に熱伝導を目的とした粉体が充填されてなる前記浸漬ヒータの機能維持方法において、
前記ヒータ本体の内部の空気を、真空ポンプを利用して吸い出した後、前記保護管と、発熱体及び導電体との間に不活性ガスを不活性ガス供給部によって充満させるもので、
前記真空ポンプ及び不活性ガス供給部は着脱自在に接続部に取り付けられ、前記浸漬ヒータは、前記接続部より下位において、溶解または保持炉の上壁に取り付けられ、
前記ヒータ本体の上端部に、前記ヒータ本体の内部を密封するシール材を設けるとともに、前記シール材より下側でかつ前記上壁より上側の位置で、前記ヒータ本体の上部下端で粉体が充填されている部分の上端に補助シールを設けたことを特徴とする浸漬ヒータの機能維持方法。
A heating element and a conductor are built in the protective tube that constitutes the heater body with a dipping heater that heats the molten metal by immersing it in the molten metal used for melting or maintaining the temperature. In the method for maintaining the function of the immersion heater, in which powder for the purpose of heat conduction is filled between the heating element and the inner peripheral side and the outer peripheral side of the conductor.
After sucking out the air inside the heater body using a vacuum pump , an inert gas is filled between the protective tube and the heating element and the conductor by an inert gas supply unit .
The vacuum pump and the inert gas supply unit are detachably attached to the connection portion, and the immersion heater is attached to the upper wall of the melting or holding furnace below the connection portion.
A sealing material for sealing the inside of the heater body is provided at the upper end of the heater body, and powder is filled at the upper and lower ends of the heater body at a position below the sealing material and above the upper wall. A method for maintaining the function of an immersion heater, which comprises providing an auxiliary seal at the upper end of the portion.
溶解または温度保持に使用される溶湯に浸漬して前記溶湯を加熱する浸漬ヒータでそのヒータ本体を構成する保護管には発熱体及び導電体が内蔵されるとともに前記保護管と、発熱体及び導電体との間に熱伝導を目的とした粉体が充填されてなる前記浸漬ヒータの機能維持方法において、A heating element and a conductor are built in the protective tube that constitutes the heater body with a dipping heater that heats the molten metal by immersing it in the molten metal used for melting or maintaining the temperature. In the method for maintaining the function of the immersion heater, which is filled with a powder for the purpose of heat conduction between the body and the body.
前記ヒータ本体の内部の空気を、真空ポンプを利用して吸い出した後、前記保護管と、発熱体及び導電体との間に不活性ガスを不活性ガス供給部によって充満させるもので、 After sucking out the air inside the heater body using a vacuum pump, an inert gas is filled between the protective tube and the heating element and the conductor by an inert gas supply unit.
前記真空ポンプ及び不活性ガス供給部は着脱自在に接続部に取り付けられ、前記浸漬ヒータは、前記接続部より下位において、溶解または保持炉の上壁に取り付けられ、 The vacuum pump and the inert gas supply unit are detachably attached to the connection portion, and the immersion heater is attached to the upper wall of the melting or holding furnace below the connection portion.
前記ヒータ本体の上端部に、前記ヒータ本体の内部を密封するシール材を設けるとともに、前記シール材より下側でかつ前記上壁より上側の位置で、前記ヒータ本体の上部下端で粉体が充填されている部分の上端に補助シールを設けたことを特徴とする浸漬ヒータの機能維持方法。 A sealing material for sealing the inside of the heater body is provided at the upper end of the heater body, and powder is filled at the upper and lower ends of the heater body at a position below the sealing material and above the upper wall. A method for maintaining the function of an immersion heater, which comprises providing an auxiliary seal at the upper end of the portion.
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