JP5925027B2 - Electromagnetic pump for liquid metal - Google Patents

Electromagnetic pump for liquid metal Download PDF

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JP5925027B2
JP5925027B2 JP2012093444A JP2012093444A JP5925027B2 JP 5925027 B2 JP5925027 B2 JP 5925027B2 JP 2012093444 A JP2012093444 A JP 2012093444A JP 2012093444 A JP2012093444 A JP 2012093444A JP 5925027 B2 JP5925027 B2 JP 5925027B2
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liquid metal
pump
electromagnetic pump
side duct
tank
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三浦　邦明
邦明 三浦
和彦 萩谷
和彦 萩谷
陸浩 冨田
陸浩 冨田
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Sukegawa Electric Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E30/30—Nuclear fission reactors

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Description

本発明は、原子力利用分野で使用されるナトリウム等の液体金属を搬送するために使用される液体金属用電磁ポンプに関し、特に誘導子を含む電磁ポンプ本体を液体金属に浸漬し、同液体金属を汲み出す方式のいわゆる浸漬型液体金属用電磁ポンプにおいて、誘導子を保護するケースやダクトの熱応力を緩和し、それらの破損を防止することが出来る浸漬型液体金属用電磁ポンプに関する。   The present invention relates to an electromagnetic pump for liquid metal used to transport a liquid metal such as sodium used in the field of nuclear power application, and in particular, an electromagnetic pump body including an inductor is immersed in the liquid metal, and the liquid metal is BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called submerged liquid metal electromagnetic pump that pumps out a liquid metal electromagnetic pump that can relieve thermal stress in a case and duct that protect an inductor and prevent them from being damaged.

例えば原子力利用分野で使用されるナトリウム等を搬送するために、電磁誘導作用により液体金属に推力を与えて搬送する液体金属用電磁ポンプが利用されている。このような液体金属用電磁ポンプは、磁性体製のヨークにコイルを巻いた誘導子により筒状のダクト内部に移動磁界を発生させて液体金属に推力を与え、供給する形式の誘導形電磁ポンプが主流である。   For example, in order to transport sodium or the like used in the nuclear power application field, an electromagnetic pump for liquid metal is used which transports by applying a thrust to the liquid metal by electromagnetic induction. Such an electromagnetic pump for liquid metal is an induction type electromagnetic pump of a type in which a moving magnetic field is generated in a cylindrical duct by an inductor in which a coil is wound around a yoke made of a magnetic material, and thrust is supplied to the liquid metal to supply it. Is the mainstream.

このような誘導形電磁ポンプは、例えば特開２００６−３４１２８１号公報に記載されている。液体金属が流れる管状のダクトの外周に、移動磁界を発生するためのヨークにコイルを巻いた誘導子を配置し、誘導子により発生した磁界の磁路となる磁性体のコアを管状のダクト内部に配置している。コアは耐熱性及び耐蝕性を有する筒状の保護管により覆われている。従って、液体金属の流路は管状のダクトと保護管との間に形成される環状部分となる。これによりこの種の電磁ポンプは環状流路形電磁ポンプと呼ばれている。このうち特に電磁ポンプの誘導子を含む本体を液体金属に浸漬し、同液体金属を汲み出す方式のものは、浸漬型液体金属用電磁ポンプと呼ばれている。   Such an induction type electromagnetic pump is described in, for example, Japanese Patent Application Laid-Open No. 2006-341281. An inductor having a coil wound around a yoke for generating a moving magnetic field is arranged on the outer periphery of a tubular duct through which liquid metal flows, and a magnetic core serving as a magnetic path of the magnetic field generated by the inductor is disposed inside the tubular duct. Is arranged. The core is covered with a cylindrical protective tube having heat resistance and corrosion resistance. Accordingly, the liquid metal flow path is an annular portion formed between the tubular duct and the protective tube. Therefore, this type of electromagnetic pump is called an annular flow type electromagnetic pump. Of these, the type that immerses the main body including the inductor of the electromagnetic pump in a liquid metal and pumps out the liquid metal is called an immersion type liquid metal electromagnetic pump.

図２は、この浸漬型液体金属用電磁ポンプの従来例である。このタイプの液体金属用電磁ポンプ４は誘導子５をステンレス鋼等の耐熱性及び耐蝕性を有する材料からなる保護ケース１１の中に収納し、電磁ポンプ４のほぼ全体が液体金属槽１０の中の液体金属１２に浸漬している。保護ケース１１の下端中央に液体金属を導入する孔があり、この部分にポンプ側ダクト１の下端が密に接合し、液体金属入口１７が開口している。このポンプ側ダクト１の液体金属入口１７からポンプ側ダクト１内に液体金属槽１０の中の液体金属１２を汲み上げ、これを給湯側ダクト１’を通して目的の位置に供給する。給湯側ダクト１’の外周には保温のためのヒータ９’と保温材１８が設けられている。   FIG. 2 shows a conventional example of this submersible liquid metal electromagnetic pump. In this type of liquid metal electromagnetic pump 4, the inductor 5 is housed in a protective case 11 made of a material having heat resistance and corrosion resistance such as stainless steel, and almost the entire electromagnetic pump 4 is contained in the liquid metal tank 10. It is immersed in the liquid metal 12. There is a hole through which liquid metal is introduced at the center of the lower end of the protective case 11, and the lower end of the pump side duct 1 is closely joined to this portion, and the liquid metal inlet 17 is opened. The liquid metal 12 in the liquid metal tank 10 is pumped into the pump side duct 1 from the liquid metal inlet 17 of the pump side duct 1 and supplied to the target position through the hot water supply side duct 1 '. On the outer periphery of the hot water supply side duct 1 ′, a heater 9 ′ and a heat insulating material 18 for heat insulation are provided.

ポンプ側ダクト１の誘導子５を設けた部分の内部には、この誘導子５で発生した磁界を通し、同誘導子５と共に磁路を形成するための磁性体製のコア２が収納されている。このコア２は、ステンレス鋼等の耐熱性及び耐蝕性を有する材料からなる保護管３の中に収納され、保護管３とコア２との間には、マグネシア粉末等の充填材８が充填されている。このコア２を収納した保護管３はその両端に放射状に設けられたスペーサ１５、１６によりポンプ側ダクト１の中に保持される。   Inside the portion of the pump side duct 1 where the inductor 5 is provided, a magnetic core 2 is housed for passing a magnetic field generated by the inductor 5 and forming a magnetic path with the inductor 5. Yes. The core 2 is housed in a protective tube 3 made of a material having heat resistance and corrosion resistance, such as stainless steel, and a filler 8 such as magnesia powder is filled between the protective tube 3 and the core 2. ing. The protective tube 3 containing the core 2 is held in the pump-side duct 1 by spacers 15 and 16 provided radially at both ends thereof.

このような浸漬型液体金属用電磁ポンプの課題としては、液体金属の凝固・収縮後の再溶解時に液体金属槽１０の中の液体金属１２が膨張し、浸漬型電磁ポンプが押し上げられ、液体金属槽１０や浸漬型電磁ポンプが破損してしまうことである。図２に示すように、液体金属槽１０の中の液体金属１２が膨張し、その液面が符合ｅで示すように押し上げられ、二点鎖線で示したような状態となる。   The problem of such an immersion liquid metal electromagnetic pump is that the liquid metal 12 in the liquid metal tank 10 expands at the time of remelting after solidification and contraction of the liquid metal, and the immersion type electromagnetic pump is pushed up. The tank 10 and the submersible electromagnetic pump are damaged. As shown in FIG. 2, the liquid metal 12 in the liquid metal tank 10 expands, and its liquid surface is pushed up as indicated by the symbol e, resulting in a state as indicated by a two-dot chain line.

例えば、供給する液体金属が液体金属ナトリウムの場合、溶融金属槽１０にはオーステナイト系ステンレス鋼が使われ、ナトリウムの融点まで昇温した時にオーステナイト系ステンレス鋼に生じる室温２０℃からの熱ひずみεは、ナトリウムの融点が９８℃としたとき、次の計算式からε＝０．４１％となる。
ε＝（ρｎａ−ρｓｕｓ）×ΔT＝０．４１％
ρｎａ＝Naの熱膨張係数＝７１×１０−6 （１／℃）
ρｓｕｓ＝オーステナイト系ステンレス鋼の熱膨張係数＝１８×１０−6 （１／℃）
ΔT＝ナトリウムの融点と室温との温度差（℃） For example, when the liquid metal to be supplied is liquid metal sodium, austenitic stainless steel is used for the molten metal tank 10, and the thermal strain ε from room temperature 20 ° C. generated in the austenitic stainless steel when the temperature is raised to the melting point of sodium is When the melting point of sodium is 98 ° C., ε = 0.41% from the following calculation formula.
ε = (ρ na −ρ sus ) × ΔT = 0.41%
ρ na = thermal expansion coefficient of Na = 71 × 10 −6 (1 / ° C.)
ρ sus = thermal expansion coefficient of austenitic stainless steel = 18 × 10 −6 (1 / ° C.)
ΔT = temperature difference between the melting point of sodium and room temperature (° C)

一般的な金属の降伏ひずみ（塑性が始まるひずみ）は０．２％であり、単純計算では前記熱ひずみε＝０．４１％においてオーステナイト系ステンレス鋼は塑性域に入っており、強度上容器の破損が考えられる。例えば、０．２％の熱ひずみに対する応力σを計算してみると、ＪＩＳ等の圧力容器の構造規格が規定しているオーステナイト系ステンレス鋼（ＳＵＳ ３０４ＴＰ）の許容応力＝１２９Ｎ／ｍｍ２（４０℃）以上になってしまう。
σ＝ε×E＝３８６Ｎ／ｍｍ２＞許容応力１２９Ｎ／ｍｍ２
E＝ヤング率＝１．９３×１０５Ｎ／ｍｍ２ （５０℃） The yield strain (strain at which plasticity starts) of a general metal is 0.2%, and in a simple calculation, the austenitic stainless steel is in the plastic region at the thermal strain ε = 0.41%. Possible damage. For example, when calculating the stress σ with respect to 0.2% thermal strain, the allowable stress of austenitic stainless steel (SUS 304TP) specified by the structural standards of pressure vessels such as JIS = 129 N / mm 2 (40 ℃) or more.
σ = ε × E = 386 N / mm 2 > allowable stress 129 N / mm 2
E = Young's modulus = 1.93 × 10 5 N / mm 2 (50 ° C.)

しかし、熱応力は、ひずみ制御型の応力なので多少許容応力の割増が認められている。熱応力に対する許容応力は、ＡＳＭＥｓｅｃｔｉｏｎIIIや発電用原子力設備に関する技術基準を定める省令５０１号等より簡単な計算式（ＡＮＳＩのＰｏｗｅｒ Ｐｉｐｉｎｇ規格）で求められる許容応力ＳＡをも超えてしまう（米国規格は、ｐｓｉ単位系であるがＪＩＳ規格値を代入）。
ＳＡ＝ｆ×（１．２５Ｓｃ＋０．２５Ｓｈ）＝１．０×（１．２５×１２９＋０．２５×１２２）＝１９１．７５Ｎ／ｍｍ２
Ｓｃ＝常温時の許容応力＝１２９Ｎ／ｍｍ２（４０℃）
Ｓｈ＝高温時の許容応力＝１２２Ｎ／ｍｍ２（１００℃）
ｆ＝熱サイクル数で決まる係数＝１．０（７０００回以下の場合） However, since the thermal stress is a strain control type stress, a slight increase in allowable stress is recognized. Allowable stress against thermal stresses, would also exceed the allowable stress S A obtained by a simple calculation from equation Ordinance 501 No. like defining the technical standards for ASMEsectionIII and generators for nuclear power equipment (ANSI of Power Piping Standard) (US Standard , Psi unit system but substitute JIS standard value).
S A = f × (1.25S c + 0.25S h ) = 1.0 × (1.25 × 129 + 0.25 × 122) = 191.75 N / mm 2
S c = Allowable stress at normal temperature = 129 N / mm 2 (40 ° C.)
S h = Allowable stress at high temperature = 122 N / mm 2 (100 ° C.)
f = coefficient determined by the number of thermal cycles = 1.0 (in the case of 7000 times or less)

特開２００９−６８８号公報JP 2009-688 A 特開２００９−６８９号公報JP 2009-689 A 特開２００２−３４６７３号公報JP 2002-34673 A 特開平０６−３２８２２９号公報Japanese Patent Laid-Open No. 06-328229 特開平０５−４２３５８号公報JP 05-42358 A

本発明はこのような従来の浸漬型液体金属用電磁ポンプにおける課題に鑑み、液体金属の凝固・収縮後の再溶解時に液体金属槽１０の中の液体金属１２が膨張することにより、特にポンプ側ダクト１の液体金属入口１７と液体金属槽１０の底面との間の部分で生じる液体金属の膨張に伴う電磁ポンプに発生する熱応力、熱歪みを緩和し、電磁ポンプの破損を防止することを目的とする。   In view of the problems in the conventional electromagnetic pump for submerged liquid metal, the present invention expands the liquid metal 12 in the liquid metal tank 10 at the time of remelting after the solidification and contraction of the liquid metal. To alleviate thermal stress and thermal distortion generated in the electromagnetic pump accompanying the expansion of the liquid metal generated in the portion between the liquid metal inlet 17 of the duct 1 and the bottom surface of the liquid metal tank 10, and prevent the electromagnetic pump from being damaged. Objective.

本発明では、前記目的を達成するため、液体金属用電磁ポンプの液体金属を吸い込むポンプ側ダクト１の液体金属入口１７と液体金属１２を収納した液体金属槽１０の底面との隙間ｔを、液体金属槽１０の呼び径ＤＡ（Ａ呼称）に応じて所定の値より狭くした。また、ポンプ側ダクト１の液体金属入口１７と液体金属槽１０の底面との隙間ｔを小さくした場合、液体金属槽１０の底面に沈積している不純物も一緒に汲み上げてしまわないように液体金属入口１７の直下に位置する液体金属槽１０の底面に邪魔板となる笠形の構造物を設けた。   In the present invention, in order to achieve the above object, the gap t between the liquid metal inlet 17 of the pump-side duct 1 for sucking the liquid metal of the liquid metal electromagnetic pump and the bottom surface of the liquid metal tank 10 containing the liquid metal 12 is defined as a liquid. It was made narrower than a predetermined value according to the nominal diameter DA (A name) of the metal tank 10. Further, when the gap t between the liquid metal inlet 17 of the pump-side duct 1 and the bottom surface of the liquid metal tank 10 is reduced, the liquid metal is prevented from being pumped up together with impurities deposited on the bottom surface of the liquid metal tank 10. A shade-shaped structure serving as a baffle plate was provided on the bottom surface of the liquid metal tank 10 located directly under the inlet 17.

すなわち、本発明による液体金属用電磁ポンプは、液体金属を通す筒状のポンプ側ダクト１の外周に同ポンプ側ダクト１の中に移動磁界を発生させる誘導子５を設け、この誘導子５を保護ケース１１で覆って液体金属１２の中に浸漬している。そして、ポンプ側ダクト１の下端の液体金属入口１７を液体金属１２が収納された液体金属槽１０の底面に向けると共に、同ポンプ側ダクト１の液体金属入口１７の直下の液体金属槽１０の底面に中心部から周辺部に向かって低くなるような勾配を形成し、前記液体金属槽１０の呼び径ＤＡ（Ａ呼称）に対し、前記ポンプ側ダクト１の下端の液体金属入口１７と液体金属槽１０の底面との隙間ｔをｔ≦０．０００６ＤＡ ２＋０．６１１４ＤＡ−４０（ｍｍ）とする。 That is, the liquid metal electromagnetic pump according to the present invention is provided with an inductor 5 for generating a moving magnetic field in the pump side duct 1 on the outer periphery of a cylindrical pump side duct 1 through which the liquid metal passes. It is covered with a protective case 11 and immersed in the liquid metal 12. Then, the liquid metal inlet 17 at the lower end of the pump side duct 1 is directed to the bottom surface of the liquid metal tank 10 in which the liquid metal 12 is stored, and the bottom surface of the liquid metal tank 10 immediately below the liquid metal inlet 17 of the pump side duct 1. The liquid metal inlet 17 and the liquid metal tank at the lower end of the pump-side duct 1 are formed with respect to the nominal diameter DA (A name) of the liquid metal tank 10. The gap t with the bottom surface of 10 is set to t ≦ 0.0006 DA 2 +0.6114 DA −40 (mm).

アルカリ金属は、柔らかいこともあって完全弾塑性体（応力度−歪み関係において、歪み０．２％以下では弾性体として直線的な変化を示すが、それを越える歪みでは応力度が一定値で歪みだけが大きくなる性質を持つ材料）に近い特性を有する。このため歪み０．２％を越えると自らが変形し、伸びてしまう。従って、図２の様に液体金属槽１０の中に液体金属１２の熱膨張を吸収する空間、すなわち液面より上に空間があって、且つアルカリ金属の歪み０．２％の時の応力（耐力）に相当する圧力で押しても壊れない液体金属槽１０であれば、液体金属１２はその膨張時に図２で符合ｅ及び二点鎖線で示すように前記の熱膨張を吸収する空間へ膨らむ。この状態では電磁ポンプ４には過大な熱応力が掛からず、液体金属槽１０が壊れることはない。特に、摂氏単位で融点の４０％程度の温度以上になるとクリープ特性（荷重が掛かったままでいると伸びだす特性）が働き、少ない圧力（熱歪みが小さく相当圧力が小さい）で伸び出し、常温時よりも小さい圧力で伸び出し、より安全側になる。従って理論上液体金属槽１０がアルカリ金属の０．２％歪みの応力（耐力）に相当する圧力に耐えれば、液体金属は液体金属槽１０の中でその液面より上に盛り上がるだけで液体金属槽１０が壊れることはない。   Alkali metal is soft and may be a perfect elasto-plastic body (in the stress-strain relationship, it shows a linear change as an elastic body when the strain is 0.2% or less, but with a strain exceeding that, the stress level is a constant value. It has a characteristic close to that of a material having the property that only strain increases. For this reason, if the strain exceeds 0.2%, it deforms and stretches itself. Therefore, as shown in FIG. 2, there is a space in the liquid metal tank 10 that absorbs the thermal expansion of the liquid metal 12, that is, a space above the liquid surface, and the stress when the strain of the alkali metal is 0.2% ( In the case of the liquid metal tank 10 that is not broken even when pressed with a pressure corresponding to (proof strength), the liquid metal 12 swells to a space that absorbs the thermal expansion as indicated by a symbol e and a two-dot chain line in FIG. In this state, excessive heat stress is not applied to the electromagnetic pump 4, and the liquid metal tank 10 is not broken. In particular, when the temperature exceeds about 40% of the melting point in degrees Celsius, creep characteristics (characteristics that expand when the load is applied) work, and it expands with low pressure (low thermal strain and corresponding pressure is small). It expands with less pressure and becomes safer. Accordingly, if the liquid metal tank 10 theoretically withstands a pressure corresponding to a stress (proof stress) of 0.2% strain of alkali metal, the liquid metal is simply raised above the liquid level in the liquid metal tank 10. The tank 10 is not broken.

しかしながら、液体金属槽１０に電磁ポンプ４を入れた場合、液体金属槽１０内の液体金属１２の均一な予熱が出来ず、温度むらが生じ易い（温度分布が付きやすい）。このため、液体金属１２の凝固・収縮後の再溶解時に液体金属１２を吸い上げる部分、すなわちダクト１の液体金属入口１７と液体金属槽１０の底面との隙間ｔの部分の凝固金属が最初に溶け出すと、電磁ポンプ４が押し上げられ、電磁ポンプ４やそのコア２の部分に過大な応力が発生し損傷する場合がある。   However, when the electromagnetic pump 4 is put in the liquid metal tank 10, the liquid metal 12 in the liquid metal tank 10 cannot be preheated uniformly, and temperature unevenness is likely to occur (temperature distribution is easily attached). For this reason, the solid metal in the portion that sucks up the liquid metal 12 during remelting after the solidification and contraction of the liquid metal 12, that is, the portion of the gap t between the liquid metal inlet 17 of the duct 1 and the bottom surface of the liquid metal tank 10 is first melted. When it comes out, the electromagnetic pump 4 is pushed up, and an excessive stress may be generated and damaged in the electromagnetic pump 4 and the core 2 portion.

そこで、ポンプ側ダクト１の液体金属入口１７と液体金属槽１０の底面との隙間ｔの寸法を、液体金属槽１０の呼び径ＤＡ（Ａ呼称）との関係でｔ≦０．０００６ＤＡ ２＋０．６１１４ＤＡ−４０（ｍｍ）で計算される値より小さくすると、その部分の液体金属１２の絶対的な伸び量が制限されるため、電磁ポンプ４に発生する熱応力はそれだけ小さくなり、電磁ポンプ４の破損には至らない。このｔ≦０．０００６ＤＡ ２＋０．６１１４ＤＡ−４０（ｍｍ）は解析により求めた隙間ｔと液体金属槽１０の呼び径ＤＡとの関係である。 Therefore, the dimension of the gap t between the liquid metal inlet 17 of the pump-side duct 1 and the bottom surface of the liquid metal tank 10 is t ≦ 0.0006 DA 2 +0 in relation to the nominal diameter DA (A name) of the liquid metal tank 10. .. 6114 DA −40 (mm) smaller than the value calculated, the absolute elongation of the liquid metal 12 in that portion is limited, so the thermal stress generated in the electromagnetic pump 4 is reduced accordingly, and the electromagnetic pump 4 is not damaged. This t ≦ 0.0006 DA 2 +0.6114 DA −40 (mm) is the relationship between the gap t obtained by analysis and the nominal diameter DA of the liquid metal tank 10.

ところが前述した隙間ｔを小さくすればする程、電磁ポンプ４で液体金属１２を汲み上げるとき、液体金属槽１０の底に沈積している不純物も一緒に汲み上げてしまうことになる。そこで、ポンプ側ダクト１の下端の液体金属入口１７を液体金属１２が収納された液体金属槽１０の底面に向けると共に、ポンプ側ダクト１の下端の液体金属入口１７の直下の液体金属槽１０の底面に中心部から周辺部に向かって低くなるような勾配を形成する。具体的には、液体金属入口１７の直下に位置する液体金属槽１０の底に不純物が汲み上げられないように邪魔板１３を設ける。この邪魔板１３の上面には、笠状の角度、すなわちその上面に中心部から周辺部に向かうに従って次第に低くなるような勾配を与えておく。これによりダクト１の下端の液体金属入口１７からその直下に液体金属１２をドレンしたときに、ドレンと共も排出された不純物が邪魔板１３の上に停滞せず、邪魔板１３からその周辺の一段低くなった液体金属槽１０の底に排除される。 However, the smaller the gap t described above, the more the impurities deposited on the bottom of the liquid metal tank 10 will be pumped together when the liquid metal 12 is pumped by the electromagnetic pump 4. Therefore, the liquid metal inlet 17 at the lower end of the pump side duct 1 is directed to the bottom surface of the liquid metal tank 10 in which the liquid metal 12 is stored, and the liquid metal tank 10 immediately below the liquid metal inlet 17 at the lower end of the pump side duct 1 is placed. A gradient is formed on the bottom surface so as to decrease from the center to the periphery. Specifically, the baffle plate 13 is provided so that impurities are not pumped up to the bottom of the liquid metal tank 10 located immediately below the liquid metal inlet 17. On the upper surface of the baffle 13, previously given bevel-shaped angle, i.e. the gradient gradually decreases toward the peripheral portion from the central portion on the upper surface thereof. Thus, when the liquid metal 12 is drained directly from the liquid metal inlet 17 at the lower end of the duct 1 , impurities discharged together with the drain do not stagnate on the baffle plate 13, and the baffle plate 13 has a surrounding area. The liquid metal tank 10 which is lowered by one step is eliminated at the bottom.

以上説明した通り、本発明による液体金属用電磁ポンプでは、液体金属１２の凝固・収縮後の再溶解時に液体金属１２を汲み上げる部分、すなわちポンプ側ダクト１の液体金属入口１７と液体金属槽１０の底面との隙間ｔの部分の凝固金属が最初に溶け出しても電磁ポンプ４やそのコア２の部分に過大な応力が発生せず、それが損傷するのを防止する効果がある。   As described above, in the liquid metal electromagnetic pump according to the present invention, the portion of the liquid metal 12 that is pumped up when the liquid metal 12 is remelted after solidification / contraction, that is, the liquid metal inlet 17 of the pump-side duct 1 and the liquid metal tank 10. Even if the solidified metal in the gap t with the bottom surface first melts, excessive stress is not generated in the electromagnetic pump 4 or the core 2 portion, and it is effective in preventing damage.

また、液体金属入口１７の直下に位置する液体金属槽１０の底に邪魔板１３を設け、この邪魔板１３の上面に中央から周辺部に向かうに従って低くなるような勾配を与えることで、ポンプ側ダクト１から液体金属１２をドレンしたときに、ドレンと共に排出された不純物が邪魔板１３の上に停滞せず、邪魔板１３からその周辺の一段低くなった液体金属槽１０の底に排除され、前述した隙間ｔを小さくしても、電磁ポンプ４で液体金属１２を汲み上げるとき、液体金属槽１０の底に沈積している不純物も一緒に汲み上げてしまうことが無い。従って不純物の汲み上げを防止することが出来る。   In addition, a baffle plate 13 is provided at the bottom of the liquid metal tank 10 located directly below the liquid metal inlet 17, and the upper surface of the baffle plate 13 is given a gradient that becomes lower from the center toward the peripheral portion, so that the pump side When the liquid metal 12 is drained from the duct 1, the impurities discharged together with the drain do not stagnate on the baffle plate 13, and are removed from the baffle plate 13 to the bottom of the liquid metal tank 10 that is one step lower in the surrounding area. Even if the gap t described above is reduced, when the liquid metal 12 is pumped up by the electromagnetic pump 4, the impurities deposited on the bottom of the liquid metal tank 10 are not pumped up together. Therefore, the pumping up of impurities can be prevented.

本発明による浸漬型の液体金属用電磁ポンプの一実施例を示す断面図である。It is sectional drawing which shows one Example of the immersion type liquid metal electromagnetic pump by this invention. 浸漬型の液体金属用電磁ポンプの従来例を示す断面図である。It is sectional drawing which shows the prior art example of the immersion type electromagnetic pump for liquid metals.

本発明では、液体金属用電磁ポンプのポンプ側ダクト１の液体金属入口１７と液体金属槽１０の底面との隙間ｔを所定の値より狭くした。さらにポンプ側ダクト１の液体金属入口１７から液体金属槽１０の底面に沈積している不純物も一緒に汲み上げてしまわないように液体金属入口１７の直下に位置する液体金属槽１０の底面に邪魔板となる笠形の構造物を設けた。
以下、本発明を実施するための最良の形態について、実施例をあげて詳細に説明する。 In the present invention, the gap t between the liquid metal inlet 17 of the pump side duct 1 of the liquid metal electromagnetic pump and the bottom surface of the liquid metal tank 10 is made narrower than a predetermined value. Further, a baffle plate is formed on the bottom surface of the liquid metal tank 10 located immediately below the liquid metal inlet 17 so that impurities deposited on the bottom surface of the liquid metal tank 10 from the liquid metal inlet 17 of the pump side duct 1 are not pumped together. A shade-shaped structure is provided.
Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

図１は、本発明による浸漬型の液体金属用誘導電磁ポンプの一実施例である。この液体金属用誘導電磁ポンプの構成は基本的に図２により前述した従来の電磁ポンプと同じであり、同じ部分は同じ符号を付してある。
この浸漬型の液体金属用電磁ポンプは、電磁ポンプ４のほぼ全体を液体金属１２の中に浸漬して使用する。誘導子５に通電していない運転休止時は、ポンプ側ダクト１の中にある液体金属の液面が液体金属槽１０側の液体金属１２の液面と同じ高さである。 FIG. 1 shows an embodiment of an immersion electromagnetic pump for liquid metal according to the present invention. The configuration of this liquid metal induction electromagnetic pump is basically the same as that of the conventional electromagnetic pump described above with reference to FIG. 2, and the same parts are denoted by the same reference numerals.
This immersion-type electromagnetic pump for liquid metal is used by immersing almost the entire electromagnetic pump 4 in the liquid metal 12. When the operation is stopped when the inductor 5 is not energized, the liquid level of the liquid metal in the pump-side duct 1 is the same level as the liquid level of the liquid metal 12 on the liquid metal tank 10 side.

ポンプ側ダクト１は、ステンレス鋼等の耐熱性、耐蝕性のある材料で作られている。このポンプ側ダクト１の周囲には、液体金属槽１０の蓋となる部材から吊り下げられた磁性体製のヨーク６にコイル７を巻回した誘導子５が配置されている。この誘導子５と前記ポンプ側ダクト１の外周側は、ステンレス鋼等の耐熱性及び耐蝕性を有する材料からなる保護ケース１１の中に収納されている。この保護ケース１１の下端中央に孔があり、この孔にポンプ側ダクト１の下端が密に接合されている。ポンプ側ダクト１の下端が液体金属入口１７として液体金属槽１０の底面に向けて開口している。   The pump side duct 1 is made of a heat resistant and corrosion resistant material such as stainless steel. Around the pump-side duct 1 is disposed an inductor 5 in which a coil 7 is wound around a magnetic yoke 6 suspended from a member serving as a lid of the liquid metal tank 10. The outer periphery side of the inductor 5 and the pump side duct 1 is housed in a protective case 11 made of a material having heat resistance and corrosion resistance such as stainless steel. There is a hole in the center of the lower end of the protective case 11, and the lower end of the pump side duct 1 is closely joined to the hole. The lower end of the pump-side duct 1 opens as a liquid metal inlet 17 toward the bottom surface of the liquid metal tank 10.

誘導子５は、ポンプ側ダクト１を囲むように縦に設けられたヨーク６に３相電源と接続できるコイルを縦に配列して巻回したもので、縦型３相リニアモータ構造を有している。従ってコイルは３の倍数だけ巻回されている。この誘導子５の全体が前記保護ケース１１により覆われている。   The inductor 5 has a vertical three-phase linear motor structure in which a coil that can be connected to a three-phase power source is vertically arranged and wound around a yoke 6 that is vertically provided so as to surround the pump-side duct 1. ing. Therefore, the coil is wound by a multiple of three. The entire inductor 5 is covered with the protective case 11.

さらに、この誘導子５の内側には、ポンプ側ダクト１を囲むように巻いたマイクロヒータ等のヒータ９が設けられている。液体金属１２が凝固し、収縮した後、再び加熱して溶解する時にまず最初にこのヒータ９に電力を通電し、発熱することで、ポンプ側ダクト１の内部の凝固金属を最初に溶解する。これにより液体金属槽１０の底面と電磁ポンプ４の下端との間にある凝固金属の膨張により電磁ポンプ４に加わる膨張力をポンプ側ダクト１の中の溶解した液体金属１２を通して上側に逃がし、電磁ポンプ４を構成する保護ケース１１、ポンプ側ダクト１、コア２やその保護管３に生じる熱応力、熱歪みを低減する。   Further, a heater 9 such as a micro heater wound around the pump-side duct 1 is provided inside the inductor 5. When the liquid metal 12 is solidified and contracted and then heated and melted again, the heater 9 is first energized to generate heat, so that the solidified metal inside the pump-side duct 1 is first melted. As a result, the expansion force applied to the electromagnetic pump 4 due to the expansion of the solidified metal between the bottom surface of the liquid metal tank 10 and the lower end of the electromagnetic pump 4 is released upward through the dissolved liquid metal 12 in the pump side duct 1, Thermal stress and thermal distortion generated in the protective case 11, the pump side duct 1, the core 2 and the protective pipe 3 constituting the pump 4 are reduced.

この誘導子５の位置に対応して前記ポンプ側ダクト１の中には、磁性体製の円柱体からなるコア２が配置されている。このコア２は、上下両端が閉じられたステンレス鋼等の耐熱性、耐蝕性のある材料からなる円筒形の保護管３の中に収納されており、ポンプ側ダクト１内の液体金属と直接接触しない。この保護管３とコア２との間には、アルミナ、マグネシア等のセラミックからなる繊維状或いは粉末状の充填材８が充填されている。保護管３は、その上下両端に放射状に延びたスペーサ１５、１６によりポンプ側ダクト１の中に保持され、コア２がポンプ側ダクト１と中心軸が一致するように保持される。   Corresponding to the position of the inductor 5, a core 2 made of a magnetic cylinder is disposed in the pump-side duct 1. This core 2 is housed in a cylindrical protective tube 3 made of a heat-resistant and corrosion-resistant material such as stainless steel whose upper and lower ends are closed, and is in direct contact with the liquid metal in the pump-side duct 1. do not do. Filled between the protective tube 3 and the core 2 is a fibrous or powder filler 8 made of ceramic such as alumina or magnesia. The protective tube 3 is held in the pump-side duct 1 by spacers 15 and 16 extending radially at both upper and lower ends thereof, and the core 2 is held so that the central axis coincides with the pump-side duct 1.

ポンプ側ダクト１はその上端側において給湯側ダクト１’と接続されている。この給湯側ダクト１’の周囲にシーズヒータ等からなるヒータ線９’が巻回され、給湯側ダクト１’の内部が液体金属の融点以上の温度に加熱される。このヒータ線９’が巻回された給湯側ダクト１’の周囲が耐熱性と断熱性を有する保温材１８で囲まれている。   The pump side duct 1 is connected to the hot water supply side duct 1 ′ at the upper end side. A heater wire 9 'made of a sheathed heater or the like is wound around the hot water supply side duct 1', and the inside of the hot water supply side duct 1 'is heated to a temperature equal to or higher than the melting point of the liquid metal. The hot water supply side duct 1 ′ around which the heater wire 9 ′ is wound is surrounded by a heat insulating material 18 having heat resistance and heat insulation.

前記保護ケース１１の下端面は、その中心部である液体金属入口１７からその周辺部に向けて次第に高くなるようなテーパーが形成されている。この保護ケース１１の下端面のテーパーは、液体金属１２が凝固し、収縮した後、再び加熱して溶解する時に液体金属１２が保護ケース１１の下端面に沿って滑りやすくするためである。これにより、液体金属槽１０の底面と電磁ポンプ４の下端との間にある凝固金属の膨張により電磁ポンプ４に加わる力を保護ケース１１の外側に逃がし、電磁ポンプ４を構成する保護ケース１１、ポンプ側ダクト１、コア２やその保護管３に生じる熱応力、熱歪みを低減する。このような液体金属１２の滑り効果を有効にするために保護ケース１１の下端面のテーパー角θは１０゜以上とする。   The lower end surface of the protective case 11 is formed with a taper that gradually increases from the liquid metal inlet 17 that is the central portion toward the peripheral portion. The taper of the lower end surface of the protective case 11 is to make the liquid metal 12 slip easily along the lower end surface of the protective case 11 when the liquid metal 12 solidifies and contracts and then is heated and melted again. Thereby, the force applied to the electromagnetic pump 4 due to the expansion of the solidified metal between the bottom surface of the liquid metal tank 10 and the lower end of the electromagnetic pump 4 is released to the outside of the protective case 11, and the protective case 11 constituting the electromagnetic pump 4, Thermal stress and thermal distortion generated in the pump-side duct 1, the core 2 and the protective tube 3 are reduced. In order to make the sliding effect of the liquid metal 12 effective, the taper angle θ of the lower end surface of the protective case 11 is set to 10 ° or more.

アルカリ金属とオーステナイト系ステンレス鋼との熱膨張差で、０．２％の歪みが生じる温度は表１の通りになる。これ以上の温度になると、アルカリ金属は０．２％耐力に相当する内圧で容器を押し広げながら、自ら変形してゆき、さらに浸漬型電磁ポンプを押し上げようとする。従って、この内圧に耐える液体金属槽であり、浸漬型電磁ポンプでなければならない。   Table 1 shows the temperature at which 0.2% strain occurs due to the difference in thermal expansion between the alkali metal and the austenitic stainless steel. At a temperature higher than this, the alkali metal deforms itself while expanding the container with an internal pressure corresponding to 0.2% proof stress, and further tries to push up the immersion electromagnetic pump. Therefore, it is a liquid metal tank that can withstand this internal pressure, and must be an immersion type electromagnetic pump.

Figure 0005925027
Figure 0005925027

浸漬型電磁ポンプが液体金属槽１０の中に収納されると、その液体金属入口１７と液体金属槽１０の底面との隙間ｔがフィン効果で温度が上がらなくなってしまい、常温の部分が生じてしまう。常温のアルカリ金属の０．２％耐力はほぼ２倍になり、更に強度が必要になる。これでは容器の板厚が２倍に厚くなってしまう。更に、浸漬型電磁ポンプを取り付ける上蓋も２倍に厚くするか、ベローズを入れて浸漬型電磁ポンプがアルカリ金属の熱膨張で浮き上がる量を吸収する等のコストの掛かる設計になってしまう。これらを避けるため、隙間ｔを適切な値にしてやる必要がある。   When the immersion type electromagnetic pump is housed in the liquid metal tank 10, the gap t between the liquid metal inlet 17 and the bottom surface of the liquid metal tank 10 does not increase in temperature due to the fin effect, and a room temperature portion is generated. End up. The 0.2% yield strength of alkali metals at room temperature is almost doubled, and further strength is required. This doubles the thickness of the container. In addition, the upper lid to which the immersion type electromagnetic pump is attached is also doubled in thickness, or a bellows is inserted to absorb the amount that the immersion type electromagnetic pump floats due to the thermal expansion of the alkali metal. In order to avoid these, it is necessary to set the gap t to an appropriate value.

電磁ポンプ４の下端から液体金属槽１０の底面までの隙間（距離）ｔは、液体金属槽１０の呼び径ＤＡ（Ａ呼称）に対して次の通りとする。
ｔ≦ ０．０００６ＤＡ ２＋０．６１１４ＤＡ−４０（ｍｍ）
これは液体金属１２が凝固し、収縮した後、再び加熱して溶解する時に液体金属槽１０の底面と電磁ポンプ４の下端との間にある凝固金属の膨張により電磁ポンプ４を構成する保護ケース１１、ポンプ側ダクト１、コア２やその保護管３に生じる熱応力、熱歪みでそれらが破損しない限度として解析により決定された。具体的には、液体金属槽１０の呼び径ＤＡ（Ａ呼称）に対して前記隙間ｔを次の表２の値以下とする。 The gap (distance) t from the lower end of the electromagnetic pump 4 to the bottom surface of the liquid metal tank 10 is as follows with respect to the nominal diameter DA (A name) of the liquid metal tank 10.
t ≦ 0.0006 DA 2 +0.6114 DA −40 (mm)
This is a protective case that constitutes the electromagnetic pump 4 by the expansion of the solidified metal between the bottom surface of the liquid metal tank 10 and the lower end of the electromagnetic pump 4 when the liquid metal 12 is solidified and contracted and then heated and melted again. 11. It was determined by analysis as a limit that the heat stress and thermal strain generated in the pump side duct 1, the core 2 and the protective tube 3 thereof are not damaged. Specifically, the gap t is set to be equal to or smaller than the value in the following Table 2 with respect to the nominal diameter DA (A name) of the liquid metal tank 10.

Figure 0005925027
Figure 0005925027

しかし、前記隙間ｔを小さくすればするほど、電磁ポンプ４で液体金属１２を汲み上げるとき、液体金属槽１０の底面に沈積している不純物も一緒に汲み上げてしまうことになる。そこで、前記ポンプ側ダクト１の下端の液体金属入口１７の直下の液体金属槽１０の底面に中心部から周辺部に向かって低くなるような勾配を形成する。具体的には、液体金属槽１０の底面に邪魔板１３を設け、この邪魔板１３の上面と前記電磁ポンプ４の下端との間の隙間ｔを前述の値以下とする。邪魔板１３を支持脚１４により液体金属槽１０の底面から所要の高さに保持し、この邪魔板１３により液体金属槽１０の底面を実質上かさ上げしている。この邪魔板１３はポンプ側ダクト１から液体金属１２をドレンしたときに、ドレンと一緒に排出された不純物が邪魔板１３上に停滞しないように中心から周辺に向かって低くなるような笠形のテーパーをつけておく。 However, the smaller the gap t is, the more the impurities deposited on the bottom surface of the liquid metal tank 10 are pumped together when the liquid metal 12 is pumped by the electromagnetic pump 4. Therefore, a gradient is formed in the bottom surface of the liquid metal tank 10 immediately below the liquid metal inlet 17 at the lower end of the pump-side duct 1 so as to decrease from the central portion toward the peripheral portion. Specifically, a baffle plate 13 is provided on the bottom surface of the liquid metal tank 10, and the gap t between the top surface of the baffle plate 13 and the lower end of the electromagnetic pump 4 is set to the above value or less. The baffle plate 13 is held at a required height from the bottom surface of the liquid metal tank 10 by the support legs 14, and the bottom surface of the liquid metal tank 10 is substantially raised by the baffle plate 13. This baffle plate 13 has a cap-shaped taper so that when the liquid metal 12 is drained from the pump side duct 1, impurities discharged together with the drain are lowered from the center toward the periphery so as not to stay on the baffle plate 13. Keep on.

本発明は、例えば原子力利用技術分野、放射線利用技術等で使用されるナトリウム等の導電性液体の搬送手段として利用される導電性液体用誘導電磁ポンプに適用することが出来る。   The present invention can be applied to an inductive electromagnetic pump for a conductive liquid used as a means for transporting a conductive liquid such as sodium, which is used in, for example, the field of nuclear energy utilization technology and radiation utilization technology.

１ ポンプ側ダクト
１’ 給湯側ダクト
４ 電磁ポンプ
５ 誘導子
１０ 液体金属槽
１２ 液体金属
１７ 液体金属入口 DESCRIPTION OF SYMBOLS 1 Pump side duct 1 'Hot water supply side duct 4 Electromagnetic pump 5 Inductor 10 Liquid metal tank 12 Liquid metal 17 Liquid metal inlet

Claims (4)

液体金属を通す筒状のポンプ側ダクト（１）の外周に、同ポンプ側ダクト（１）の中に移動磁界を発生させて同ポンプ側ダクト（１）内の液体金属に推力を与える誘導子（５）を設け、この誘導子（５）を保護ケース（１１）で覆って液体金属（１２）の中に浸漬した液体金属用電磁ポンプにおいて、ポンプ側ダクト（１）の下端の液体金属入口（１７）を液体金属（１２）が収納された液体金属槽（１０）の底面に向けると共に、同ポンプ側ダクト（１）の液体金属入口（１７）の直下の液体金属槽（１０）の底面に中心部からその周辺部に向かって低くなるような勾配を形成し、前記液体金属槽（１０）の呼び径ＤＡ（Ａ呼称）に対し、前記ポンプ側ダクト（１）の下端の液体金属入口（１７）と液体金属槽（１０）の底面との隙間ｔをｔ≦０．０００６ＤＡ ２＋０．６１１４ＤＡ−４０（ｍｍ）としたことを特徴とする液体金属用電磁ポンプ。 An inductor that generates a moving magnetic field in the pump-side duct (1) on the outer periphery of the cylindrical pump-side duct (1) through which the liquid metal passes and gives thrust to the liquid metal in the pump-side duct (1) In the liquid metal electromagnetic pump provided with (5), the inductor (5) covered with the protective case (11) and immersed in the liquid metal (12), the liquid metal inlet at the lower end of the pump side duct (1) (17) is directed to the bottom surface of the liquid metal tank (10) in which the liquid metal (12) is stored, and the bottom surface of the liquid metal tank (10) immediately below the liquid metal inlet (17) of the pump side duct (1). And a liquid metal inlet at the lower end of the pump side duct (1) with respect to the nominal diameter DA (A name) of the liquid metal tank (10). (17) and the gap t between the bottom of the liquid metal tank (10) ≦ 0.0006 DA 2 +0.6114 DA -40 ( mm) and to the liquid metal electromagnetic pump, characterized in that the. 液体金属入口（１７）の直下に位置する液体金属槽（１０）の底面の一部がかさ上げされていることを特徴とする請求項１に記載の液体金属用電磁ポンプ。 2. The electromagnetic pump for liquid metal according to claim 1, wherein a part of the bottom surface of the liquid metal tank (10) located immediately below the liquid metal inlet (17) is raised. 液体金属槽（１０）の底面のかさ上げが液体金属槽（１０）の底面から高く保持された邪魔板（１３）によりなされていることを特徴とする請求項２に記載の液体金属用電磁ポンプ。 The electromagnetic pump for liquid metal according to claim 2, characterized in that the bottom of the liquid metal tank (10) is raised by a baffle plate (13) held high from the bottom of the liquid metal tank (10). . 邪魔板（１３）の上面に中心から周辺に向かって低くなるような勾配が形成されていることを特徴とする請求項３に記載の液体金属用電磁ポンプ。 The electromagnetic pump for liquid metal according to claim 3, wherein a gradient is formed on the upper surface of the baffle plate (13) so as to decrease from the center toward the periphery.
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