JP2008208778A - Centrifugal pump - Google Patents

Centrifugal pump Download PDF

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JP2008208778A
JP2008208778A JP2007046188A JP2007046188A JP2008208778A JP 2008208778 A JP2008208778 A JP 2008208778A JP 2007046188 A JP2007046188 A JP 2007046188A JP 2007046188 A JP2007046188 A JP 2007046188A JP 2008208778 A JP2008208778 A JP 2008208778A
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impeller
casing
ring
pump
corrosion resistance
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JP5096762B2 (en
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Hirokazu Takayama
博和 高山
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Ebara Corp
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Ebara Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal pump equipped with a sealing part manufactured simply and inexpensively wherein scoring is not caused between a pump-casing and an impeller eye. <P>SOLUTION: The centrifugal pump is provided with the pump casing 10, the impeller 13, and the sealing part 17 between the pump casing 10 and the impeller eye 13a. On a surface facing either of an impeller ring 31 and a casing ring 32 in the sealing part 17, such a high corrosion-resistant Ni-alloy containing Cr, Mo softer than the material in the counter surface is clad so that difference in hardness to the counter surface is at least HB (Brinell hardness) 50. Thus, scoring is not caused in the sealing part to provide the centrifugal pump having an improved sealing property. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、遠心式ポンプ（渦巻ポンプ、斜流ポンプ、軸流ポンプ）に関し、特にポンプケーシングとインペラ入口との間のシール部にかじりが発生しない遠心式ポンプに関するものである。   The present invention relates to a centrifugal pump (vortex pump, mixed flow pump, axial flow pump), and more particularly to a centrifugal pump in which no galling occurs in a seal portion between a pump casing and an impeller inlet.

ポンプケーシングとインペラを備えた遠心式ポンプにおいて、ポンプケーシングとインペラ入口のシール部に接触によるかじりが発するのを防止するため、従来下記のような対策がとられていた。
（１）ポンプケーシングとインペラ入口のクリアランスを広げる。
（２）ポンプケーシングとインペラ入口の接触部の両材料間に硬度差（ＡＰＩ ６１０（Ａｍｅｒｉｃａｎ Ｐｅｔｒｏｌｅｕｍ Ｉｎｓｔｉｔｕｔｅ，Ｃｅｎｔｒｉｆｕｇａｌ Ｐｕｍｐｓ ｆｏｒ Ｐｅｔｒｏｌｅｕｍ，Ｈｅａｖｙ Ｄｕｔｙ Ｃｈｅｍｉｃａｌ，ａｎｄ Ｇａｓ Ｉｎｄｕｓｔｒｙ Ｓｅｒｖｉｃｅｓ）によればＨＢ５０以上を規定している）をつける。 In a centrifugal pump provided with a pump casing and an impeller, conventionally, the following measures have been taken in order to prevent galling due to contact between the seal portion of the pump casing and the impeller inlet.
(1) Increase the clearance between the pump casing and the impeller inlet.
(2) Hardness difference between the materials of the pump casing and the impeller inlet contact portion (API 610 (American Petroleum Institute, Centrifugal Pumps for Petroleum, Heavy Duty Chemical, and Gas Industry Service 50 or more) )

上記硬度差は、硬度の異なった材料の組み合わせにより、又はいずれか一方の表面を高硬度材による表面改質を行うことにより、更にはいずれか一方の材料に熱処理を実施して行われていた。また、上記クリアランスを広げることはポンプ効率が低下するという問題がある。   The above hardness difference has been performed by a combination of materials having different hardnesses, or by surface modification of one of the surfaces with a high-hardness material, and further by performing a heat treatment on one of the materials. . Further, widening the clearance has a problem that the pump efficiency is lowered.

近年、大型の遠心式ポンプのシール部に高耐食性材料として同材で二相系ステンレス鋼を使用する需要が増加している。この場合シール部は下記の理由により同材質となるためクリアランスを広げ性能を犠牲にせざるを得ない。
（ａ）異種材料の組み合わせは、適正な硬度差を保てる高耐食性材料が少なく、高価で且つ少量では入手が困難であるため同材を使用せざるを得ない場合が多い。高耐食性を保つため化学成分範囲が定められるため異材でも高耐食性材料間の硬度は少なく、高耐食性材料間の硬度差を保つことが難しい場合が多い。
（ｂ）表面改質のための高硬度材料は、高耐食性の二相系ステンレス鋼と同等な耐食性を有する材料がない。また、遠心式ポンプの大型化に伴い高硬度材料による硬化処理の施工割れ等が発生し、改質処理が困難である。
（ｃ）熱処理による硬化は、４００−５００℃の熱処理により実施できるが、高耐食性の二相系ステンレス鋼が著しく脆化し、部品としてポンプへの取り付けが困難になり、本来の目的である耐食性も低下するという問題がある。
実開平６−１８６９４号公報 In recent years, there has been an increasing demand for using a duplex stainless steel of the same material as a high corrosion resistance material for a seal portion of a large centrifugal pump. In this case, since the seal part is made of the same material for the following reasons, the clearance must be widened and the performance must be sacrificed.
(A) The combination of dissimilar materials often requires the use of the same material because there are few highly corrosion-resistant materials that can maintain an appropriate hardness difference, and they are expensive and difficult to obtain in small amounts. Since the chemical component range is determined in order to maintain high corrosion resistance, the hardness between the high corrosion resistance materials is small even in different materials, and it is often difficult to maintain the hardness difference between the high corrosion resistance materials.
(B) A high hardness material for surface modification does not have a material having a corrosion resistance equivalent to that of a high corrosion resistance duplex stainless steel. Further, with the increase in the size of the centrifugal pump, cracks in the curing process using a high-hardness material occur, and the modification process is difficult.
(C) Hardening by heat treatment can be performed by heat treatment at 400-500 ° C., but the high corrosion resistance duplex stainless steel becomes extremely brittle, making it difficult to attach to the pump as a part, and the corrosion resistance that is the original purpose is also There is a problem of lowering.
Japanese Utility Model Publication No. 6-18694

本発明は上述の点に鑑みてなされたもので、ポンプケーシングとインペラ入口の間にかじりが発生することなく、製作が容易で且つ安価にできるシール部を備えた遠心式ポンプを提供することを目的とする。   The present invention has been made in view of the above points, and provides a centrifugal pump including a seal portion that can be manufactured easily and at low cost without galling between the pump casing and the impeller inlet. Objective.

上記課題を解決するため請求項１に記載の発明は、ポンプケーシングとインペラを備え、該ポンプケーシングと該インペラ入口との間にシール部を具備する遠心式ポンプにおいて、 前記シール部のインペラ又はポンプケーシングのいずれかの対向面に相手面材質より軟質のＣｒ，Ｍｏを含む高耐食Ｎｉ合金を肉盛し、相対面との高度差をＨＢ（ブリネル硬さ）を５０以上としたことを特徴とする。   In order to solve the above-mentioned problem, the invention according to claim 1 is a centrifugal pump that includes a pump casing and an impeller, and includes a seal portion between the pump casing and the impeller inlet. The impeller or pump of the seal portion It is characterized in that a high corrosion resistance Ni alloy containing Cr, Mo, which is softer than the mating material, is built up on any facing surface of the casing, and the height difference from the relative surface is HB (Brinell hardness) of 50 or more. To do.

請求項２に記載の発明は、請求項１に記載の遠心式ポンプにおいて、前記高耐食Ｎｉ合金の肉盛は、溶射法或いは溶接法で形成することを特徴とする。   The invention according to claim 2 is the centrifugal pump according to claim 1, characterized in that the build-up of the high corrosion resistance Ni alloy is formed by a thermal spraying method or a welding method.

請求項３に記載の発明は、請求項１に記載の遠心式ポンプにおいて、前記シール部分の材質は、同材の高耐食性の二相系ステンレス鋼で形成することを特徴とする遠心式ポンプ。   According to a third aspect of the present invention, in the centrifugal pump according to the first aspect, the material of the seal portion is formed of the same material, a high corrosion resistance duplex stainless steel.

請求項４に記載の発明は、請求項１乃至３のいずれか１項に記載の遠心式ポンプにおいて、前記シール部のインペラにはインペラリングが設けられており、ケーシングにケーシングリングが設けられており、前記Ｃｒ，Ｍｏを含む高耐食Ｎｉ合金の肉盛は前記インペラリング又はケーシングリングのいずれか一方の相対面に形成することを特徴とする。   According to a fourth aspect of the present invention, in the centrifugal pump according to any one of the first to third aspects, the impeller of the seal portion is provided with an impeller ring, and the casing is provided with a casing ring. In addition, the build-up of the highly corrosion-resistant Ni alloy containing Cr and Mo is formed on the relative surface of either the impeller ring or the casing ring.

請求項５に記載の発明は、請求項４に記載の遠心式ポンプにおいて、前記インペラリング及びケーシングリングは同材の高耐食性の二相系ステンレス鋼からなることを特徴とする。   According to a fifth aspect of the present invention, in the centrifugal pump according to the fourth aspect, the impeller ring and the casing ring are made of the same material, high corrosion resistance duplex stainless steel.

請求項１に記載の発明によれば、シール部のインペラ又はポンプケーシングのいずれかの対向面に相手面材質より軟質のＣｒ，Ｍｏを含む高耐食Ｎｉ合金を肉盛し、相対面との高度差をＨＢ（ブリネル硬さ）を５０以上とするので、シール部にかじりが発生することなく、良好なシール特性を維持できる。また、軟質のＣｒ，Ｍｏを含む高耐食Ｎｉ合金を肉盛するので、施工時に肉盛部に割れが発生することなく、大型の遠心式ポンプ（渦巻ポンプ、斜流ポンプ、軸流ポンプ）に適用できる。   According to the first aspect of the present invention, a high corrosion resistance Ni alloy containing Cr, Mo, which is softer than the mating surface material, is built up on the facing surface of either the impeller of the seal portion or the pump casing, and the height relative to the relative surface Since the difference is HB (Brinell hardness) of 50 or more, good sealing characteristics can be maintained without causing galling in the seal portion. In addition, because it builds up a highly corrosion-resistant Ni alloy containing soft Cr and Mo, it can be used for large centrifugal pumps (vortex pumps, mixed flow pumps, axial flow pumps) without cracking in the built-up part during construction. Applicable.

請求項２に記載の発明によれば、高耐食Ｎｉ合金の肉盛は、溶射或いは溶接法で形成するので、溶接肉盛り後の熱処理を必要としない。また、軟質材の肉盛のため溶接後の溶体化処理（高温保持後水冷）により耐食性を回復できる。また、高価な材料の使用量を少なくすることで、安価にシール部を製作できる。   According to the second aspect of the present invention, since the build-up of the high corrosion resistance Ni alloy is formed by thermal spraying or a welding method, no heat treatment after the weld build-up is required. In addition, since the soft material is built up, the corrosion resistance can be recovered by solution treatment after welding (water cooling after holding at high temperature). Moreover, the seal part can be manufactured at low cost by reducing the amount of expensive material used.

請求項３及び４に記載の発明によれば、Ｃｒ，Ｍｏを含む高耐食Ｎｉ合金の肉盛はインペラリング又はケーシングリングのいずれか一方の相対面に形成するので、インペラリング又はケーシングリングにＣｒ，Ｍｏを含む高耐食Ｎｉ合金の肉盛を溶射或いは溶接で設けた後、インペラリング又はケーシングリングをインペラ又はケーシングに装着するので加工が容易となる。また、取り扱いが容易なリング状部品への軟質材の肉盛のため入熱が多く溶射或いは溶接後に耐食性が劣化した場合も９８０−１１５０℃での高温保持後に水冷する熱処理により耐食性を回復できる。   According to the third and fourth aspects of the present invention, since the build-up of the high corrosion resistance Ni alloy containing Cr and Mo is formed on the relative surface of either the impeller ring or the casing ring, the impeller ring or the casing ring is made of Cr. Since the build-up of a highly corrosion-resistant Ni alloy containing Mo is provided by thermal spraying or welding, the impeller ring or casing ring is attached to the impeller or casing, so that processing becomes easy. In addition, because of the build-up of a soft material on a ring-shaped part that is easy to handle, even when the heat input is large and the corrosion resistance deteriorates after thermal spraying or welding, the corrosion resistance can be recovered by a heat treatment that is water-cooled after holding at a high temperature at 980-1150 ° C.

請求項５に記載の発明によれば、インペラリング及びケーシングリングは高耐食性の二相系ステンレス鋼からなるので、溶接によりＣｒ，Ｍｏを含む高耐食Ｎｉ合金を肉盛してもインペラリング又はケーシングリングの耐食性が劣化しない。   According to the invention described in claim 5, since the impeller ring and the casing ring are made of high corrosion resistance duplex stainless steel, the impeller ring or casing can be formed even if the high corrosion resistance Ni alloy containing Cr and Mo is built up by welding. The corrosion resistance of the ring does not deteriorate.

以下、本願発明の実施の形態例を図面に基づいて説明する。図１及び図２は本発明に係る遠心式ポンプの一例である両吸込渦巻ポンプの構成例を示す図である。図１は正断面図（図２のＢ−Ｂ断面）、図２は側面図（図１のＡ矢視図）である。図示するようにポンプケーシング１０はその正断面が吸込ケーシング部１１の中央部に吐出ケーシング部１２が配置され、吸込ケーシング部１１の吸込口１１ａと、吐出ケーシング部１２の吐出口１２ａは互いに反対向きとなっている。ポンプケーシング１０の中央部に主軸１４が固定されたインペラ１３が配置されている。主軸１４はその両端部が軸受１５、１５で回転自在に支持され、主軸１４の一端に電動機等の駆動装置（図示せず）が連結されている。また、ポンプケーシング１０とインペラ入口１３ａ外周の間にはシール部１７が配置されている。   Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams showing a configuration example of a double suction centrifugal pump which is an example of a centrifugal pump according to the present invention. 1 is a front sectional view (BB cross section in FIG. 2), and FIG. 2 is a side view (viewed along arrow A in FIG. 1). As shown in the figure, the pump casing 10 has a front section in which a discharge casing portion 12 is disposed at the center of the suction casing portion 11, and the suction port 11 a of the suction casing portion 11 and the discharge port 12 a of the discharge casing portion 12 are opposite to each other. It has become. An impeller 13 having a main shaft 14 fixed thereto is disposed at the center of the pump casing 10. Both ends of the main shaft 14 are rotatably supported by bearings 15, 15, and a driving device (not shown) such as an electric motor is connected to one end of the main shaft 14. A seal portion 17 is disposed between the pump casing 10 and the outer periphery of the impeller inlet 13a.

上記構成の両吸込渦巻ポンプにおいて、図示しない駆動装置により主軸１４と伴にインペラ１３を回転すると、インペラ１３の回転により、吸込ケーシング部１１の吸込口１１ａから吸い込まれた液は吸込ケーシング部１１内を矢印Ｃに示すように流れ、インペラ入口１３ａからインペラ１３内に流れ込み、吐出ケーシング部１２内を矢印Ｅに示すように流れ、吸込口１１ａとは反対側に配置された吸込ケーシング部１２の吐出口１２ａから吐出される。   When the impeller 13 is rotated together with the main shaft 14 by a driving device (not shown) in the suction pump having the above-described configuration, the liquid sucked from the suction port 11a of the suction casing portion 11 is rotated in the suction casing portion 11 by the rotation of the impeller 13. As shown by an arrow C, flows into the impeller 13 from the impeller inlet 13a, flows as shown by the arrow E in the discharge casing portion 12, and is discharged from the suction casing portion 12 disposed on the side opposite to the suction port 11a. It is discharged from the outlet 12a.

図３はシール部１７の構成を示す図（図１のＦ部分の拡大図）である。シール部１７はインペラ１３のインペラ入口１３ａ外周に設けられたインペラリング３１と、ポンプケーシング１０のインペラリング３１に対向する内周面に設けられたケーシングリング３２と該ケーシングリング３２のインペラリング３１に対向する面（相対面）に設けられた肉盛部３３から構成されている。インペラリング３１とケーシングリング３２はそれぞれ高耐食性の２相ステンレス鋼材からなる。   FIG. 3 is a view showing the configuration of the seal portion 17 (enlarged view of the F portion in FIG. 1). The seal portion 17 includes an impeller ring 31 provided on the outer periphery of the impeller inlet 13 a of the impeller 13, a casing ring 32 provided on the inner peripheral surface of the pump casing 10 facing the impeller ring 31, and the impeller ring 31 of the casing ring 32. It is comprised from the build-up part 33 provided in the surface (relative surface) which opposes. The impeller ring 31 and the casing ring 32 are each made of a duplex stainless steel material having high corrosion resistance.

肉盛部３３は軟質のＣｒ、Ｍｏを含む高耐食Ｎｉ合金からなり、粉体プラズマアーク溶接法により、ケーシングリング３２のインペラリング３１に対向する面（相対面）に該インペラリング３１より硬度差をＨＢ５０以上となるようにしている。肉盛厚さは母材との希釈を避けるため２層盛で肉盛厚さを２．５ｍｍとした。なお、ここでは粉体プラズマアーク溶接法を使用したが、他の溶接方法、例えばＭＩＧ（Ｍｅｔａｌ Ｉｎｅｒｔ Ｇａｓ）溶接法、ＴＩＧ（Ｔｕｎｇｓｔｅｎ Ｉｎｅｒｔ Ｇａｓ）溶接法を使用してもよい。   The built-up portion 33 is made of a highly corrosion-resistant Ni alloy containing soft Cr and Mo, and has a hardness difference from the impeller ring 31 on the surface (relative surface) facing the impeller ring 31 of the casing ring 32 by a powder plasma arc welding method. Is set to HB50 or more. The build-up thickness was 2 layers and the build-up thickness was 2.5 mm in order to avoid dilution with the base material. Although the powder plasma arc welding method is used here, other welding methods such as MIG (Metal Inert Gas) welding method and TIG (Tungsten Inert Gas) welding method may be used.

上記ケーシングリング３２の母材である２相ステンレス鋼は、１）耐食性の観点より４０以上のＰＲＥＮ値（孔食指標：ＰＲＥＮ値＝Ｃｒ％＋３．３Ｍｏ％＋１６Ｎ％、例えばＡＳＴＭＡ８９０で耐食性の目安とされている。）と、２）肉盛材料の硬度より０．２％以上のＮを有することが望ましい。図４は２５Ｃｒ％−７Ｎｉ％−１６％の２相ステンレス鋼についてのＮの含有率（％）とＨＢの関係を示す図である。図示するように、Ｎが０．２％以上になるとＨＢが２５０以上となる。   The duplex stainless steel that is the base material of the casing ring 32 is 1) PREN value of 40 or more from the viewpoint of corrosion resistance (pitting corrosion index: PREN value = Cr% + 3.3Mo% + 16N%, for example, ASTMA890, 2) It is desirable that N is 0.2% or more than the hardness of the build-up material. FIG. 4 is a graph showing the relationship between N content (%) and HB for a duplex stainless steel of 25Cr% -7Ni% -16%. As shown in the figure, when N is 0.2% or more, HB is 250 or more.

肉盛部３３の高耐食Ｎｉ合金は、１）耐食性の観点より、６％塩化第二鉄中での臨界隙間腐食発生試験で臨界隙間腐食発生温度（ＣＣＴ）は、Ｃｒ２７％，Ｍｏ３％＝３５％、Ｃｒ２１．５％，Ｍｏ９％＝３７．８℃，Ｃｒ１５．５％，Ｍｏ１６％＝４２℃，Ｃｒ１２．５％，Ｍｏ２０％＝４０℃で実環境での使用温度を考えるとＣｒ＋Ｍｏ≧３０％，Ｃｒ≧１２％，Ｍｏ≧２．５％、２）靭性の観点より金属間化合物の析出しないオーステナイト組織の範囲であるＭｏ≦２５％、Ｃｒ≦５０％が望ましい。プラズマアーク溶接を行い１０００℃で溶体化処理後を行った後の肉盛材料の硬さ及び組成を図５に示す。   The high corrosion resistance Ni alloy of the built-up part 33 is 1) From the viewpoint of corrosion resistance, the critical crevice corrosion occurrence temperature (CCT) in a critical crevice corrosion occurrence test in 6% ferric chloride is Cr27%, Mo3% = 35. %, Cr 21.5%, Mo 9% = 37.8 ° C., Cr 15.5%, Mo 16% = 42 ° C., Cr 12.5%, Mo 20% = 40 ° C. Considering the operating temperature in the actual environment, Cr + Mo ≧ 30% , Cr ≧ 12%, Mo ≧ 2.5%, 2) From the viewpoint of toughness, Mo ≦ 25% and Cr ≦ 50%, which are austenite structures in which no intermetallic compound precipitates, are desirable. FIG. 5 shows the hardness and composition of the overlay material after plasma arc welding and after solution treatment at 1000 ° C.

上記のようにシール部１７はケーシングリング３２のインペラリング３１に対向する面（相対面）に設けられた肉盛部３３を備えた構成であるので、シール部１７にかじりが発生することなく、良好なシール特性を維持できる。また、軟質のＣｒ，Ｍｏを含む高耐食Ｎｉ合金をプラズマアーク溶接で肉盛するので、施工時に肉盛部に割れが発生することなく、大型の遠心式ポンプ（ここでは渦巻ポンプ）に適用できる。   As described above, the seal portion 17 is configured to include the built-up portion 33 provided on the surface (relative surface) facing the impeller ring 31 of the casing ring 32, so that the seal portion 17 does not galling, Good sealing characteristics can be maintained. Moreover, since a high corrosion resistance Ni alloy containing soft Cr and Mo is built up by plasma arc welding, it can be applied to a large centrifugal pump (here, a centrifugal pump) without causing cracks in the built-up part during construction. .

また、高耐食Ｎｉ合金の肉盛は、プラズマアーク溶接法で形成するので、溶接肉盛り後の熱処理を必要としない。また、軟質材の肉盛のため溶接後の溶体化処理（高温保持後水冷）により耐食性を回復できる。また、高価な材料である軟質のＣｒ，Ｍｏを含む高耐食Ｎｉ合金の使用量を少なくすることで、安価にシール部１７を製作できる。また、インペラリング３１及びケーシングリング３２は２相ステンレス鋼材からなるので、プラズマアーク溶接によりＣｒ，Ｍｏを含む高耐食Ｎｉ合金を肉盛してもケーシングリング３２の耐食性が劣化しない。   Further, since the build-up of the high corrosion resistance Ni alloy is formed by the plasma arc welding method, the heat treatment after the weld build-up is not required. In addition, since the soft material is built up, the corrosion resistance can be recovered by solution treatment after welding (water cooling after holding at high temperature). Further, the seal portion 17 can be manufactured at low cost by reducing the amount of the high corrosion resistance Ni alloy containing soft Cr and Mo which is an expensive material. Further, since the impeller ring 31 and the casing ring 32 are made of a duplex stainless steel material, the corrosion resistance of the casing ring 32 is not deteriorated even if a high corrosion resistance Ni alloy containing Cr and Mo is built up by plasma arc welding.

なお、上記例ではケーシングリング３２のインペラリング３１に対向する面に軟質のＣｒ、Ｍｏを含む高耐食Ｎｉ合金からなる肉盛部３３を形成したが、インペラリング３１のケーシングリング３２に対向する面にプラズマアーク溶接法で肉盛部を形成してもよい。また、インペラリング３１又はケーシングリング３２にプラズマアーク溶接によりＣｒ，Ｍｏを含む高耐食Ｎｉ合金の肉盛部３３を形成した後、インペラリング３１又はケーシングリング３２に装着するので、施工が容易となる。   In the above example, the build-up portion 33 made of a highly corrosion-resistant Ni alloy containing soft Cr and Mo is formed on the surface of the casing ring 32 facing the impeller ring 31, but the surface of the impeller ring 31 facing the casing ring 32. Alternatively, the built-up portion may be formed by a plasma arc welding method. Moreover, since the build-up part 33 of the highly corrosion-resistant Ni alloy containing Cr and Mo is formed on the impeller ring 31 or the casing ring 32 by plasma arc welding, it is attached to the impeller ring 31 or the casing ring 32, so that the construction becomes easy. .

また、上記例では２相ステンレス鋼材からなるケーシングリング３２及びインペラリング３１を設けている両吸込渦巻ポンプを例に説明したが、ケーシングリング３２及びインペラリング３１を設けることなく、例えばインペラ入口１３ａ外周に対向するポンプケーシング１０内周面、又はポンプケーシング１０のインペラ入口１３ａ外周に対向する面に相手面の材質より軟質のＣｒ，Ｍｏを含む高耐食Ｎｉ合金を肉盛することで、相対面の材質との間に硬度差をＨＢ５０以上としてもよい。   Further, in the above example, the description has been given by taking the double suction centrifugal pump provided with the casing ring 32 and the impeller ring 31 made of the duplex stainless steel material as an example. By embedding a highly corrosion-resistant Ni alloy containing Cr, Mo, which is softer than the material of the mating surface, on the inner peripheral surface of the pump casing 10 or the surface facing the outer periphery of the impeller inlet 13a of the pump casing 10, the relative surface The hardness difference between the materials may be HB50 or more.

図６は本発明に係る遠心式ポンプの一例である斜流ポンプの側面構成を示す図である。図示するように、本斜流ポンプは吸込ベル２０及び吐出しボウル２１から構成されるポンプケーシングを備え、吐出しボウル２１の吐出口に吐出管２２が接続されている。２３はポンプ羽根車（インペラ）であり、該ポンプ羽根車２３は主軸２４の先端にハブ２５を介して固定され、該ポンプ羽根車２３はその先端がポンプケーシングを構成する吸込ベル２０の後端内周面に接近して位置する。吸込ベル２０内周面とポンプ羽根車２３の外周面の間にシール部１７が設けられている。   FIG. 6 is a view showing a side configuration of a mixed flow pump which is an example of a centrifugal pump according to the present invention. As shown in the figure, this mixed flow pump includes a pump casing including a suction bell 20 and a discharge bowl 21, and a discharge pipe 22 is connected to a discharge port of the discharge bowl 21. Reference numeral 23 denotes a pump impeller, which is fixed to the front end of a main shaft 24 via a hub 25, and the pump impeller 23 has a rear end of the suction bell 20 that constitutes a pump casing. Located close to the inner surface. A seal portion 17 is provided between the inner peripheral surface of the suction bell 20 and the outer peripheral surface of the pump impeller 23.

図７はシール部１７の構成を示す図（図６のＡ部分の拡大図）である。図示するように、シール部１７はポンプ羽根車２３の外先端に取付けられたインペラリング３１と吸込ベル２０の内周面にインペラリング３１と対向して取付けられたケーシングリング３２を備えている。ケーシングリング３２のインペラリング３１に対向する面（相対面）に肉盛部３３が構成されている。インペラリング３１とケーシングリング３２はそれぞれ高耐食性の２相ステンレス鋼材からなる。   FIG. 7 is a view showing the configuration of the seal portion 17 (an enlarged view of a portion A in FIG. 6). As shown in the figure, the seal portion 17 includes an impeller ring 31 attached to the outer tip of the pump impeller 23 and a casing ring 32 attached to the inner peripheral surface of the suction bell 20 so as to face the impeller ring 31. A built-up portion 33 is formed on the surface (relative surface) of the casing ring 32 facing the impeller ring 31. The impeller ring 31 and the casing ring 32 are each made of a duplex stainless steel material having high corrosion resistance.

肉盛部３３は図１乃至図３に示す構成の両吸込渦巻ポンプと同様、軟質のＣｒ、Ｍｏを含む高耐食Ｎｉ合金からなり、粉体プラズマアーク溶接により、ケーシングリング３２のインペラリング３１に対向する面（相対面）に、該インペラリング３１より硬度差をＨＢ５０以上となるようにしている。肉盛部３３の厚さは母材との希釈を避けるため２層盛で肉盛厚さを２．５ｍｍとしている。なお、ここでは粉体プラズマアーク溶接法を使用したが、他の溶接方法、例えばＭＩＧ（Ｍｅｔａｌ Ｉｎｅｒｔ Ｇａｓ）溶接法、ＴＩＧ（Ｔｕｎｇｓｔｅｎ Ｉｎｅｒｔ Ｇａｓ）溶接法を使用してもよい。   The built-up portion 33 is made of a highly corrosion-resistant Ni alloy containing soft Cr and Mo, as in the case of the double suction centrifugal pump having the configuration shown in FIGS. 1 to 3, and is formed on the impeller ring 31 of the casing ring 32 by powder plasma arc welding. The opposing surface (relative surface) has a hardness difference of HB50 or more from the impeller ring 31. In order to avoid dilution with the base material, the thickness of the build-up portion 33 is a two-layer build-up and the build-up thickness is 2.5 mm. Although the powder plasma arc welding method is used here, other welding methods such as MIG (Metal Inert Gas) welding method and TIG (Tungsten Inert Gas) welding method may be used.

上記ケーシングリング３２の母材である２相ステンレス鋼材は、上記と同様、１）耐食性の観点より４０以上のＰＲＥＮ値と、２）肉盛材料の硬度より０．２％以上のＮを有することが望ましい。また、肉盛部３３の高耐食Ｎｉ合金は、１）耐食性の観点より、Ｃｒ＋Ｍｏ≧３０％，Ｃｒ≧１２％，Ｍｏ≧２．５％、２）靭性の観点よりオーステナイト組織の範囲であるＭｏ≦２５％、Ｃｒ≦５０％が望ましい。   Similarly to the above, the duplex stainless steel material that is the base material of the casing ring 32 has 1) PREN value of 40 or more from the viewpoint of corrosion resistance, and 2) N of 0.2% or more from the hardness of the overlay material. Is desirable. Further, the high corrosion resistance Ni alloy of the built-up portion 33 is 1) Cr + Mo ≧ 30%, Cr ≧ 12%, Mo ≧ 2.5% from the viewpoint of corrosion resistance, and 2) Mo which is a range of austenite structure from the viewpoint of toughness. ≦ 25% and Cr ≦ 50% are desirable.

上記のようにシール部１７のケーシングリング３２のインペラリング３１に対向する面（相対面）に肉盛部３３が構成されているので、シール部１７にかじりが発生することなく、良好なシール特性を維持できる。また、軟質のＣｒ，Ｍｏを含む高耐食Ｎｉ合金をプラズマアーク溶接で肉盛するので、施工時に肉盛部に割れが発生することなく、大型の遠心式ポンプ（ここでは斜流ポンプ）に適用できる。   Since the built-up portion 33 is formed on the surface (relative surface) of the casing portion 32 of the seal portion 17 that faces the impeller ring 31 as described above, the seal portion 17 is not galling and has good sealing characteristics. Can be maintained. In addition, since high corrosion-resistant Ni alloy containing soft Cr and Mo is built up by plasma arc welding, it is applied to large centrifugal pumps (here, mixed flow pump) without cracking in the built-up part during construction. it can.

また、高耐食Ｎｉ合金の肉盛は、プラズマアーク溶接法で形成するので、溶接肉盛り後の熱処理を必要としない。また、軟質材の肉盛のため溶接後の溶体化処理（高温保持後水冷）により耐食性を回復できる。また、高価な材料である軟質のＣｒ，Ｍｏを含む高耐食Ｎｉ合金の使用量を少なくすることで、安価にシール部１７を製作できる。また、インペラリング３１及びケーシングリング３２は２相ステンレス鋼材からなるので、プラズマアーク溶接によりＣｒ，Ｍｏを含む高耐食Ｎｉ合金を肉盛してもケーシングリング３２の耐食性が劣化しない。   Further, since the build-up of the high corrosion resistance Ni alloy is formed by the plasma arc welding method, the heat treatment after the weld build-up is not required. In addition, since the soft material is built up, the corrosion resistance can be recovered by solution treatment after welding (water cooling after holding at high temperature). Further, the seal portion 17 can be manufactured at low cost by reducing the amount of the high corrosion resistance Ni alloy containing soft Cr and Mo which is an expensive material. Further, since the impeller ring 31 and the casing ring 32 are made of a duplex stainless steel material, the corrosion resistance of the casing ring 32 is not deteriorated even if a high corrosion resistance Ni alloy containing Cr and Mo is built up by plasma arc welding.

なお、軟質のＣｒ、Ｍｏを含む高耐食Ｎｉ合金からなる肉盛部３３は、インペラリング３１のケーシングリング３２に対向する面にプラズマアーク溶接法で形成してもよい。   The build-up portion 33 made of a highly corrosion-resistant Ni alloy containing soft Cr and Mo may be formed on the surface of the impeller ring 31 facing the casing ring 32 by a plasma arc welding method.

図８は本発明に係る遠心式ポンプの一例である軸流ポンプの側断面構成を示す図である。図示するように、本軸流ポンプはポンプケーシング２７を具備し、その先端に吸込ケーシング２６が接続され、後端に吐出ケーシング２８が接続されている。２９はポンプ羽根車（インペラ）であり、該ポンプ羽根車２９は主軸２４の先端にハブ３０を介して固定され、該ポンプ羽根車２９は主軸２４の先端にハブ３０を介して固定され、該ポンプ羽根車２９はその先端がポンプケーシング２７の内周面近傍に位置する。ポンプケーシング２７の内周面とポンプ羽根車２９の外周面の間にシール部１７が設けられている。   FIG. 8 is a view showing a side sectional configuration of an axial flow pump which is an example of a centrifugal pump according to the present invention. As shown in the figure, the axial flow pump includes a pump casing 27, a suction casing 26 is connected to the front end, and a discharge casing 28 is connected to the rear end. Reference numeral 29 denotes a pump impeller (impeller). The pump impeller 29 is fixed to the tip of the main shaft 24 via a hub 30, and the pump impeller 29 is fixed to the tip of the main shaft 24 via a hub 30, The tip of the pump impeller 29 is located in the vicinity of the inner peripheral surface of the pump casing 27. A seal portion 17 is provided between the inner peripheral surface of the pump casing 27 and the outer peripheral surface of the pump impeller 29.

図９はシール部１７の構成を示す図（図８のＡ部分の拡大図）である。図示するように、シール部１７はポンプ羽根車２３の外周先端に取付けられたインペラリング３１とポンプケーシング２７の内周面にインペラリング３１と対向して取付けられたケーシングリング３２を備えている。ケーシングリング３２のインペラリング３１に対向する面（相対面）に肉盛部３３が形成されている。インペラリング３１とケーシングリング３２はそれぞれ高耐食性の２相ステンレス鋼材からなる。   FIG. 9 is a view showing the configuration of the seal portion 17 (enlarged view of portion A in FIG. 8). As shown in the drawing, the seal portion 17 includes an impeller ring 31 attached to the outer peripheral tip of the pump impeller 23 and a casing ring 32 attached to the inner peripheral surface of the pump casing 27 so as to face the impeller ring 31. A built-up portion 33 is formed on the surface (relative surface) facing the impeller ring 31 of the casing ring 32. The impeller ring 31 and the casing ring 32 are each made of a duplex stainless steel material having high corrosion resistance.

肉盛部３３は図１乃至図３に示す構成の両吸込渦巻ポンプと同様、軟質のＣｒ、Ｍｏを含む高耐食Ｎｉ合金からなり、粉体プラズマアーク溶接により、ケーシングリング３２のインペラリング３１に対向する面（相対面）に該インペラリング３１より硬度差をＨＢ５０以上となるようにしている。肉盛部３３の厚さは母材との希釈を避けるため２層盛で肉盛厚さを２．５ｍｍとしている。なお、ここでは粉体プラズマアーク溶接法を使用したが、他の溶接方法、例えばＭＩＧ（Ｍｅｔａｌ Ｉｎｅｒｔ Ｇａｓ）溶接法、ＴＩＧ（Ｔｕｎｇｓｔｅｎ Ｉｎｅｒｔ Ｇａｓ）溶接法を使用してもよい。   The built-up portion 33 is made of a highly corrosion-resistant Ni alloy containing soft Cr and Mo, as in the case of the double suction centrifugal pump having the configuration shown in FIGS. 1 to 3, and is formed on the impeller ring 31 of the casing ring 32 by powder plasma arc welding. The opposing surface (relative surface) has a hardness difference of HB50 or more from the impeller ring 31. In order to avoid dilution with the base material, the thickness of the build-up portion 33 is a two-layer build-up and the build-up thickness is 2.5 mm. Although the powder plasma arc welding method is used here, other welding methods such as MIG (Metal Inert Gas) welding method and TIG (Tungsten Inert Gas) welding method may be used.

上記ケーシングリング３２の母材である２相ステンレス鋼は、上記と同様、１）耐食性の観点より４０以上のＰＲＥＮ値と、２）肉盛材料の硬度より０．２％以上のＮを有することが望ましい。また、肉盛部３３の高耐食Ｎｉ合金は、１）耐食性の観点より、Ｃｒ＋Ｍｏ≧３０％，Ｃｒ≧１２％，Ｍｏ≧２．５％、２）靭性の観点よりオーステナイト組織の範囲であるＭｏ≦２５％、Ｃｒ≦５０％が望ましい。   The duplex stainless steel that is the base material of the casing ring 32 has 1) a PREN value of 40 or more from the viewpoint of corrosion resistance and 2) N of 0.2% or more than the hardness of the built-up material, as described above. Is desirable. Further, the high corrosion resistance Ni alloy of the built-up portion 33 is 1) Cr + Mo ≧ 30%, Cr ≧ 12%, Mo ≧ 2.5% from the viewpoint of corrosion resistance, and 2) Mo which is a range of austenite structure from the viewpoint of toughness. ≦ 25% and Cr ≦ 50% are desirable.

上記のようにシール部１７のケーシングリング３２のインペラリング３１に対向する面（相対面）に肉盛部３３が構成されているので、シール部１７にかじりが発生することなく、良好なシール特性を維持できる。また、軟質のＣｒ，Ｍｏを含む高耐食Ｎｉ合金をプラズマアーク溶接で肉盛するので、施工時に肉盛部に割れが発生することなく、大型の遠心式ポンプ（ここでは軸流ポンプ）に適用できる。   Since the built-up portion 33 is formed on the surface (relative surface) of the casing portion 32 of the seal portion 17 that faces the impeller ring 31 as described above, the seal portion 17 is not galling and has good sealing characteristics. Can be maintained. In addition, since high corrosion-resistant Ni alloys containing soft Cr and Mo are built up by plasma arc welding, they are applied to large centrifugal pumps (here, axial flow pumps) without cracking in the built-up part during construction. it can.

また、高耐食Ｎｉ合金の肉盛は、プラズマアーク溶接法で形成するので、溶接肉盛り後の熱処理を必要としない。また、軟質材の肉盛のため溶接後の溶体化処理（高温保持後水冷）により耐食性を回復できる。また、高価な材料である軟質のＣｒ，Ｍｏを含む高耐食Ｎｉ合金の使用量を少なくすることで、安価にシール部１７を製作できる。また、インペラリング３１及びケーシングリング３２は２相ステンレス鋼材からなるので、プラズマアーク溶接によりＣｒ，Ｍｏを含む高耐食Ｎｉ合金を肉盛してもケーシングリング３２の耐食性が劣化しない。   Further, since the build-up of the high corrosion resistance Ni alloy is formed by the plasma arc welding method, the heat treatment after the weld build-up is not required. In addition, since the soft material is built up, the corrosion resistance can be recovered by solution treatment after welding (water cooling after holding at high temperature). Further, the seal portion 17 can be manufactured at low cost by reducing the amount of the high corrosion resistance Ni alloy containing soft Cr and Mo which is an expensive material. Further, since the impeller ring 31 and the casing ring 32 are made of a duplex stainless steel material, the corrosion resistance of the casing ring 32 is not deteriorated even if a high corrosion resistance Ni alloy containing Cr and Mo is built up by plasma arc welding.

なお、軟質のＣｒ、Ｍｏを含む高耐食Ｎｉ合金からなる肉盛部３３は、インペラリング３１のケーシングリング３２に対向する面にプラズマアーク溶接法で形成してもよい。   The build-up portion 33 made of a highly corrosion-resistant Ni alloy containing soft Cr and Mo may be formed on the surface of the impeller ring 31 facing the casing ring 32 by a plasma arc welding method.

以上、本発明の実施形態を説明したが、本発明は上記実施形態に限定されるものではなく、特許請求の範囲、及び明細書と図面に記載された技術的思想の範囲内において種々の変形が可能である。   Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

本発明に係る両吸込渦巻ポンプの構成例を示す正断面図（図２のＢ−Ｂ断面）である。It is a front sectional view (BB section of Drawing 2) showing an example of composition of both suction centrifugal pumps concerning the present invention. 本発明に係る両吸込渦巻ポンプの構成例を示す側面図（図１のＡ矢視図）である。It is a side view (A arrow line view of FIG. 1) which shows the structural example of the both suction centrifugal pump which concerns on this invention. 本発明に係る両吸込渦巻ポンプのシール部の構成を示す図（図１のＦ部分の拡大）である。It is a figure (magnification of F section of Drawing 1) showing the composition of the seal part of both suction centrifugal pumps concerning the present invention. Ｆｅ基２５Ｃｒ−７Ｎｉ−３Ｍｏ含有合金（二相ステンレス鋼）についてのＮの含有率とＨＢの関係を示す図である。It is a figure which shows the relationship between the content rate of N, and HB about the Fe group 25Cr-7Ni-3Mo containing alloy (duplex stainless steel). 肉盛部のプラズマアーク溶接後１０００℃溶体化処理後の肉盛材料の硬さ及び組成を示す図である。It is a figure which shows the hardness and composition of the cladding material after 1000 degreeC solution treatment after the plasma arc welding of the cladding part. 本発明に係る斜流ポンプの構成例を示す側断面図である。It is a sectional side view which shows the structural example of the mixed flow pump which concerns on this invention. 本発明に係る斜流ポンプのシール部の構成を示す図（図６のＡ部分の拡大）である。It is a figure which shows the structure of the seal part of the mixed flow pump which concerns on this invention (enlargement of the A section of FIG. 6). 本発明に係る軸流ポンプの構成例を示す側断面図である。It is a sectional side view showing the example of composition of the axial flow pump concerning the present invention. 本発明に係る軸流ポンプのシール部の構成を示す図（図８のＡ部分の拡大）である。It is a figure which shows the structure of the seal part of the axial flow pump which concerns on this invention (enlargement of the A section of FIG. 8).

符号の説明Explanation of symbols

１０ ポンプケーシング
１１ 吸込ケーシング部
１２ 吐出ケーシング部
１３ インペラ
１４ 主軸
１５ 軸受
１６ 軸封部
１７ シール部
２０ 吸込ベル
２１ 吐出しボウル
２２ 吐出管
２３ ポンプ羽根車（インペラ）
２４ 主軸
２５ ハブ
２６ 吸込ケーシング
２７ ポンプケーシング
２８ 吐出ケーシング
２９ ポンプ羽根車（インペラ）
３０ ハブ
３１ インペラリング
３２ ケーシングリング
３３ 肉盛部 DESCRIPTION OF SYMBOLS 10 Pump casing 11 Suction casing part 12 Discharge casing part 13 Impeller 14 Main shaft 15 Bearing 16 Shaft seal part 17 Seal part 20 Suction bell 21 Discharge bowl 22 Discharge pipe 23 Pump impeller (impeller)
24 Main shaft 25 Hub 26 Suction casing 27 Pump casing 28 Discharge casing 29 Pump impeller (impeller)
30 Hub 31 Impeller ring 32 Casing ring 33 Overlaying part

Claims (5)

ポンプケーシングとインペラを備え、該ポンプケーシングと該インペラ入口との間にシール部を具備する遠心式ポンプにおいて、
前記シール部のインペラ又はポンプケーシングのいずれかの対向面に相手面材質より軟質のＣｒ，Ｍｏを含む高耐食Ｎｉ合金を肉盛し、相対面との高度差をＨＢ（ブリネル硬さ）を５０以上としたことを特徴とする遠心式ポンプ。 In a centrifugal pump comprising a pump casing and an impeller, and having a seal portion between the pump casing and the impeller inlet,
Highly corrosion-resistant Ni alloy containing Cr and Mo, which is softer than the mating surface material, is built up on the facing surface of either the impeller or the pump casing of the seal portion, and the height difference from the relative surface is set to 50 (Brinell hardness). Centrifugal pump characterized by the above. 請求項１に記載の遠心式ポンプにおいて、
前記高耐食Ｎｉ合金の肉盛は、溶射法或いは溶接法で形成することを特徴とする遠心式ポンプ。 The centrifugal pump according to claim 1, wherein
The high-corrosion resistant Ni alloy overlay is formed by thermal spraying or welding. 請求項１に記載の遠心式ポンプにおいて、
前記シール部分の材質は、同材の高耐食性の二相系ステンレス鋼で形成することを特徴とする遠心式ポンプ。 The centrifugal pump according to claim 1, wherein
The material of the sealing part is formed of the same material and high corrosion resistance duplex stainless steel. 請求項１乃至３のいずれか１項に記載の遠心式ポンプにおいて、
前記シール部のインペラにはインペラリングが設けられており、ケーシングにケーシングリングが設けられており、前記Ｃｒ，Ｍｏを含む高耐食Ｎｉ合金の肉盛は前記インペラリング又はケーシングリングのいずれか一方の相対面に形成することを特徴とする遠心式ポンプ。 The centrifugal pump according to any one of claims 1 to 3,
An impeller ring is provided on the impeller of the seal portion, a casing ring is provided on the casing, and the build-up of the highly corrosion-resistant Ni alloy containing Cr and Mo is either the impeller ring or the casing ring. A centrifugal pump characterized by being formed on a relative surface. 請求項４に記載の遠心式ポンプにおいて、
前記インペラリング及びケーシングリングは同材の高耐食性の二相系ステンレス鋼からなることを特徴とする遠心式ポンプ。 The centrifugal pump according to claim 4, wherein
The impeller ring and the casing ring are made of the same material and are made of high corrosion resistance duplex stainless steel.
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