JPH0618078Y2 - Boiler circulation canned motor pump - Google Patents
Boiler circulation canned motor pumpInfo
- Publication number
- JPH0618078Y2 JPH0618078Y2 JP1985161719U JP16171985U JPH0618078Y2 JP H0618078 Y2 JPH0618078 Y2 JP H0618078Y2 JP 1985161719 U JP1985161719 U JP 1985161719U JP 16171985 U JP16171985 U JP 16171985U JP H0618078 Y2 JPH0618078 Y2 JP H0618078Y2
- Authority
- JP
- Japan
- Prior art keywords
- canned motor
- passage
- main pump
- pump
- partition chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- Structures Of Non-Positive Displacement Pumps (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、ボイラ循環用キャンドモータポンプに係り、
ボイラ循環水に混在する鉄粒、鉄錆などの磁性体異物が
キャンドモータ部内に侵入して軸受に異常摩耗を生じさ
せるのを阻止したキャンドモータポンプの構造に関す
る。[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a canned motor pump for circulating a boiler,
The present invention relates to a structure of a canned motor pump that prevents magnetic foreign matter such as iron particles and iron rust mixed in circulating water of a boiler from entering the canned motor unit and causing abnormal wear of a bearing.
発電プラントなどに使用されるボイラ循環用ポンプとし
ては、近年、ボイラの蒸気条件の高温高圧化、または急
速起動、急激な負荷変動などの高性能化に伴ない、メカ
ニカルシールなどの軸封部を有するポンプではポンプ取
扱液すなわち高温高圧の危険なボイラ循環水の漏洩阻止
に充分対応できないことから、ウェットモータまたはキ
ャンドモータを採用した完全無漏洩構造のポンプが使用
されており、現在はウェットモータ型が主流を占めてい
る。As a boiler circulation pump used in power plants, etc., shaft seal parts such as mechanical seals have been used in recent years due to high temperature and high pressure steam conditions of boilers, or high performance such as rapid startup and sudden load changes. Since the existing pump cannot sufficiently prevent the leakage of the pumped liquid, that is, the dangerous circulating water of the boiler at high temperature and high pressure, a completely leak-free pump using a wet motor or canned motor is used. Is the mainstream.
しかし、キャンドモータ型もキャン部分その他の製作技
術の進歩により信頼性が向上され、およびウェットモー
タ型のような特殊な浸水型巻線、および高耐圧力の端子
箱を必要としないことから比較的廉価に提供できるので
見直されつつある。However, the canned motor type has improved reliability due to the progress of the manufacturing technology of the canned portion and others, and does not require a special submerged type winding like the wet motor type and a high pressure resistant terminal box. It is being reviewed because it can be provided at a low price.
このボイラ循環用キャンドモータポンプ（ウェット型も
同様であるが）は、第１に軸受が無潤滑とならないよう
にキャンドモータ部内の空気抜きが必要であるがこの空
気抜きを簡単にすること、第２に高温のボイラ循環水の
キャンドモータ部への対流を抑えてキャンドモータ部の
冷却を容易にすること、第３に回転軸が中心から片寄っ
てポンプが停止している際に、高温のボイラ循環水の自
然対流の量が回転軸との隙間の広い方で多くなるために
回転軸に熱影響の差による曲げが生じて回転部が静止部
に接触し始動不能とならないようにすることなどの目的
から、第３図に示すように、主ポンプ部２を上側にキャ
ンドモータ部３を下側に配置してアダプタ４にて接続し
た逆置形が採用されている。In this boiler circulation canned motor pump (same as in the wet type), first, it is necessary to bleed air in the canned motor part so that the bearing is not lubricated. The convection of the hot boiler circulating water to the canned motor part is suppressed to facilitate the cooling of the canned motor part. Thirdly, when the rotary shaft is offset from the center and the pump is stopped, the hot boiler circulating water is cooled. Since the amount of natural convection in the rotating shaft increases in the area with a wider gap between the rotating shaft and the rotating shaft, bending due to the difference in thermal influence occurs, so that the rotating part does not come into contact with the stationary part and cannot start. Therefore, as shown in FIG. 3, an inverted type is adopted in which the main pump portion 2 is arranged on the upper side and the canned motor portion 3 is arranged on the lower side and connected by the adapter 4.
ところで、前記第３図に示すボイラ循環用キャンドモー
タポンプが使用されるボイラ循環経路のボイラや配管な
どは一般に鉄材を溶接して構成されており、その溶接の
際のノロ、スパッタなど鉄粒異物を完全に清掃除去する
のが困難であるため、ポンプを運転するとこの異物がボ
イラ循環水に連れて循環され、この一部が主ポンプ部２
からキャンドモータ部３へ侵入し、軸受11，12，13に異
常摩耗を生じさせる。By the way, the boiler and the piping of the boiler circulation path in which the canned motor pump for circulating the boiler shown in FIG. 3 is generally constructed by welding iron material, and when the welding is carried out, iron particles such as slag and spatter are generated. Since it is difficult to completely clean and remove the foreign matter, when the pump is operated, this foreign substance is circulated along with the boiler circulating water, and a part of this foreign matter is circulated.
Penetrates into the canned motor portion 3 and causes abnormal wear to the bearings 11, 12, and 13.
すなわち、前記第１乃至第３の問題対策上、主ポンプ羽
根車24を有する主ポンプ部２を上側に固定子６、回転子
７を有し冷却ジャケット21aを設けたキャンドモータ部
３を下側に配置しているため、および前記鉄粒異物が水
より比重が大なるため、主ポンプ部２からアダプタ４の
軸貫通部4aと回転軸10との隙間22に容易に落下侵入し、
この隙間22をさらに落下してキャンドモータ部３へ侵入
する。That is, in order to solve the first to third problems, the main pump portion 2 having the main pump impeller 24 is provided on the upper side, the canned motor portion 3 having the stator 6, the rotor 7 and the cooling jacket 21a is provided on the lower side. Since the iron particle foreign matter has a larger specific gravity than water, it easily falls from the main pump portion 2 into the gap 22 between the shaft penetrating portion 4a of the adapter 4 and the rotary shaft 10,
The gap 22 further falls and enters the canned motor unit 3.
また、前記ボイラ循環経路に最初から残存する異物に比
べてはその量は少ないが、後日発生する鉄錆がボイラ循
環水に混在されても同様に軸受11，12，13の異常摩耗が
生じる。Further, the amount of foreign matter remaining in the boiler circulation path is smaller than that of the foreign matter left from the beginning, but abnormal wear of the bearings 11, 12, 13 similarly occurs even when iron rust generated later is mixed in the boiler circulating water.
本考案は、前記問題点に鑑みなされたもので、前記ボイ
ラ循環水に含まれる異物の殆んどが水より比重の大きな
鉄粒、鉄錆など磁性体異物であることに着目し、主ポン
プ羽根車24とアダプタ４との間に前記磁性体異物を堆積
させるための仕切室31を設け、この仕切室３１の内径部
に前記磁性体異物の通過を妨げるよう上下に折り返した
折り返し通路41と前記磁性体異物を磁気吸着する永久磁
石42とを配設することにより、前記磁性体異物のキャン
ドモータ部３の侵入による軸受11，12，13の異常摩耗の
発生を阻止したボイラ循環用キャンドモータポンプを提
供せんとするものである。The present invention has been made in view of the above problems, and paying attention to the fact that most of the foreign substances contained in the boiler circulating water are magnetic foreign substances such as iron particles and iron rust having a larger specific gravity than water. A partition chamber 31 for accumulating the magnetic foreign matter is provided between the impeller 24 and the adapter 4, and a return passage 41 that is folded back up and down to prevent passage of the magnetic foreign matter is provided in an inner diameter portion of the partition chamber 31. By disposing the permanent magnet 42 that magnetically attracts the magnetic foreign matter, the canned motor for circulating the boiler is prevented from causing abnormal wear of the bearings 11, 12, 13 due to the invasion of the canned motor unit 3 by the magnetic foreign matter. It is intended to provide a pump.
本考案のボイラ循環用キャンドモータの構成は、主ポン
プ部２とキャンドモータ部３とを前記主ポンプ部２を上
側に前記キャンドモータ部３を下側にしてアダプタ４を
介して液密に一体に接続し、前記キャンドモータ部３に
液密に一体に構成した補助ポンプ５にて前記キャンドモ
ータ部３内に主ポンプ取扱液とは別の清水を循環させる
独立したキャンドモータ循環経路を有する縦型キャンド
モータポンプにおいて、前記アダプタ４と主ポンプ羽根
車24との間に主ポンプ室23と区画した仕切室31を設け、
この仕切室31の内径部に、回転軸10との間に半径方向隙
間からなる内側通路33を介して前記アダプタ４から上方
へ突出した内側固定環34と、この内側固定環34の外側に
半径方向隙間からなる中間通路35を介して前記回転軸10
に開放端を下方にして取着したカップ状の回転環36と、
この回転環36の外側に半径方向隙間からなる外側通路37
を介して前記仕切室31の上端部から下方へ突出した外側
固定環38とをそれぞれ同心に配設して、前記外側通路37
と前記中間通路35および前記内側通路33を連設した折り
返し通路41を形成し、この折り返し通路41の前記仕切室
31に開放される下方折り返し部39に近接して前記仕切室
31に環状に永久磁石42を配設し、前記主ポンプ部２の低
圧部と前記キャンドモータ部３とを前記折り返し通路41
および前記アダプタ４の軸貫通部4aと前記回転軸10との
隙間22を介して連通してなるものである。The structure of the boiler circulation canned motor of the present invention is such that the main pump unit 2 and the canned motor unit 3 are liquid-tightly integrated via the adapter 4 with the main pump unit 2 on the upper side and the canned motor unit 3 on the lower side. And an independent canned motor circulation path for circulating fresh water different from the main pump handling liquid in the canned motor part 3 by an auxiliary pump 5 which is liquid-tightly integrated with the canned motor part 3. In the canned motor pump of the type, a partition chamber 31 which is partitioned from the main pump chamber 23 is provided between the adapter 4 and the main pump impeller 24,
An inner fixing ring 34 protruding upward from the adapter 4 through an inner passage 33 formed by a radial gap between the partition chamber 31 and the rotary shaft 10 and a radius outside the inner fixing ring 34. Through the intermediate passage 35 formed by a directional gap
A cup-shaped rotary ring 36 attached with the open end downward,
Outside the rotary ring 36, an outer passage 37 formed of a radial gap is formed.
The outer fixed ring 38 projecting downward from the upper end of the partition chamber 31 via the above-mentioned
And the intermediate passage 35 and the inner passage 33 are connected to each other to form a turn-back passage 41, and the partition chamber of the turn-back passage 41 is formed.
The partition chamber is provided in the vicinity of the lower folded-back portion 39 opened to 31.
A permanent magnet 42 is annularly arranged in 31 to connect the low pressure portion of the main pump portion 2 and the canned motor portion 3 to the return passage 41.
Further, the shaft penetrating portion 4a of the adapter 4 and the rotary shaft 10 are communicated with each other through a gap 22.
主ポンプ部２から折り返し通路41の外側通路37へ落下し
た水より比重の大きな磁性体異物は、その一部が永久磁
石42に吸着され、残りが仕切室31の下底部に落下して堆
積され、また万一、折り返し通路41の中間通路35に侵入
されても磁性体異物の比重が大きなことおよび折り返し
通路41の液の移動が実際上無視し得る程度であることか
ら磁性体異物は中間通路35を上方へ移動されることなく
再び落下されて永久磁石42に吸着され、キャンドモータ
部３へは侵入されない。A part of the magnetic foreign matter having a larger specific gravity than water that has dropped from the main pump unit 2 to the outer passage 37 of the return passage 41 is adsorbed by the permanent magnet 42, and the rest falls and is deposited on the lower bottom portion of the partition chamber 31. In addition, even if the magnetic foreign matter enters the intermediate passage 35 of the return passage 41, the specific gravity of the magnetic foreign matter is large and the movement of the liquid in the return passage 41 is practically negligible. 35 is dropped again without being moved upward, is attracted to the permanent magnet 42, and does not enter the canned motor unit 3.
次に、本考案の一実施例の構成を第１図及び第２図に基
づき説明する。Next, the structure of an embodiment of the present invention will be described with reference to FIGS.
１はボイラ循環用キャンドモータポンプで、主ポンプ部
２とキャンドモータ部３が主ポンプ部２を上側にキャン
ドモータ部３を下側にしてアダプタ４を介して液密に一
体に接続されており、前記キャンドモータ部３の下側に
はこのキャンドモータ部３の冷却と軸受潤滑用の例えば
３段ポンプの補助ポンプ５が液密に一体に構成されてい
る。Reference numeral 1 denotes a boiler circulation canned motor pump, in which a main pump unit 2 and a canned motor unit 3 are liquid-tightly connected integrally via an adapter 4 with the main pump unit 2 on the upper side and the canned motor unit 3 on the lower side. An auxiliary pump 5 such as a three-stage pump for cooling the canned motor unit 3 and bearing lubrication is integrally formed liquid-tightly on the lower side of the canned motor unit 3.
前記キャンドモータ部３の固定子６および回転子７はそ
れぞれ固定子キャン８および回転子キャン９にて密閉さ
れている。The stator 6 and the rotor 7 of the canned motor unit 3 are sealed by a stator can 8 and a rotor can 9, respectively.
前記回転子７が固着された回転軸10は回転子７の両端方
に設けられた上部ラジアル軸受11と下部ラジアル軸受12
およびこの下部ラジアル軸受12と補助ポンプ５との間に
設けられたスラスト軸受13によって回動自在に支架され
ており、上部ラジアル軸受11の下端面に回転軸10に取着
されたスラストカラ14が対面されて補助スラスト軸受が
形成されている。The rotating shaft 10 to which the rotor 7 is fixed has an upper radial bearing 11 and a lower radial bearing 12 provided at both ends of the rotor 7.
Further, a thrust bearing 13 provided between the lower radial bearing 12 and the auxiliary pump 5 is rotatably supported, and a thrust collar 14 attached to the rotary shaft 10 faces the lower end surface of the upper radial bearing 11. Thus, the auxiliary thrust bearing is formed.
前記キャンドモータ部３の上端部、すなわち上部ラジア
ル軸受11の上端部と補助ポンプ５の吸込側15とがアダプ
タ４の下部フランジ部に削設された通孔16、循環パイプ
17、熱交換器18および循環パイプ19にて液密に連通さ
れ、ボイラ循環水とは別の清水が補助ポンプ５によって
補助ポンプ５からスラスト軸受13、下部ラジアル軸受1
2、固定子キャン８と回転子キャン９との隙間20、上部
ラジアル軸受11、通孔16、循環パイプ17を経て熱交換器
18に流れ、この熱交換器18にて熱交換された清水は循環
パイプ19を経て補助ポンプ５の吸込側15に還流されて循
環されるようにキャンドモータ部３の冷却と各軸受11，
12，13の潤滑のための独立循環方式によるキャンドモー
タ循環経路が形成されている。A through hole 16 in which the upper end portion of the canned motor portion 3, that is, the upper end portion of the upper radial bearing 11 and the suction side 15 of the auxiliary pump 5 are cut in the lower flange portion of the adapter 4, a circulation pipe
17, the heat exchanger 18 and the circulation pipe 19 communicate with each other in a liquid-tight manner, and fresh water different from the boiler circulating water is pumped by the auxiliary pump 5 from the auxiliary pump 5 to the thrust bearing 13 and the lower radial bearing 1
2. Heat exchanger through gap 20 between stator can 8 and rotor can 9, upper radial bearing 11, through hole 16, circulation pipe 17
Cooling of the canned motor part 3 and each bearing 11, so that the fresh water which flows to 18 and is heat-exchanged by the heat exchanger 18 is circulated by circulating to the suction side 15 of the auxiliary pump 5 through the circulation pipe 19.
A canned motor circulation path is formed by the independent circulation method for lubrication of 12 and 13.
また、前記キャンドモータ部３のフレーム21にはキャン
ドモータ部３を外側から冷却するための冷却ジャケット
21aが設けられている。Further, the frame 21 of the canned motor unit 3 has a cooling jacket for cooling the canned motor unit 3 from the outside.
21a is provided.
そして、前記アダプタ４の軸貫通部4aとの間に隙間22を
介して主ポンプ部２に一体に突出した回転軸10の先端部
には主ポンプ室23に配設された主ポンプ羽根車24が取着
されており、主ポンプ部２の吸込口25および吐出口26は
それぞれ図示しないボイラ循環経路の配管に接続されて
いる。The main pump impeller 24 disposed in the main pump chamber 23 is provided at the tip of the rotary shaft 10 that integrally projects with the main pump portion 2 through a gap 22 between the adapter 4 and the shaft penetrating portion 4a. Is attached, and the suction port 25 and the discharge port 26 of the main pump unit 2 are respectively connected to the pipes of the boiler circulation path (not shown).
以上の構成は、本考案の前提となる従来のボイラ循環用
キャンドモータポンプの例を示したもので、次に本考案
の特徴部分に係わる実施例の構成について説明する。The above configuration shows an example of a conventional boiler circulation canned motor pump, which is the premise of the present invention. Next, the configuration of the embodiment relating to the characteristic portion of the present invention will be described.
第２図に示すように前記アダプタ４の上端面外径部にカ
ップ状の仕切壁体27がボルト28にて取着され、この仕切
壁体27の上底壁27aは主ポンプ部２のケーシング後壁の
一部を兼ねて主ポンプ羽根車24に対面されており、この
主ポンプ羽根車24のボス部29と仕切壁体27の上底壁27a
の内周面との間に狭い隙間30が設けられて前記仕切壁体
27の内側が主ポンプ室23と区画された仕切室31として形
成されている。As shown in FIG. 2, a cup-shaped partition wall 27 is attached to the outer diameter portion of the upper end surface of the adapter 4 by a bolt 28, and an upper bottom wall 27a of the partition wall 27 is a casing of the main pump unit 2. It faces the main pump impeller 24 also as a part of the rear wall, and the boss portion 29 of this main pump impeller 24 and the upper bottom wall 27a of the partition wall body 27.
A narrow gap 30 is provided between the partition wall body and the inner peripheral surface of the partition wall body.
The inside of 27 is formed as a partition chamber 31 which is partitioned from the main pump chamber 23.
そして、この仕切室31の内径部に、アダプタ４にボルト
32にて取着されて回転軸10との間に半径方向隙間からな
る内側通路33を介して上方へ突出した内側固定環34と、
この内側固定環34の外側に半径方向隙間からなる中間通
路35を介して回転軸10に開放端を下方にして取着された
カップ状の回転環36と、この回転環36の外側に半径方向
隙間からなる外側通路37を介して仕切壁体27の上底壁27
aの内径部から下方へ突出した外側固定環38とが、それ
ぞれ同心に配設されており、この外側通路37と中間通路
35とが各下端部において仕切室31に開放されて前記回転
環36の下方内外周面に沿った下方折り返し部39にて連設
され、中間通路35と内側通路33とが前記回転環36の内底
面と内側固定環34の上端縁との軸方向隙間40を介して連
接され、すなわち、外側通路37、中間通路35および内側
通路33が順次連接されて上下に折り返された折り返し通
路41が形成されている。Then, the adapter 4 is bolted to the inner diameter of the partition chamber 31.
An inner fixed ring 34 that is attached at 32 and protrudes upward through an inner passage 33 formed of a radial gap with the rotating shaft 10,
A cup-shaped rotary ring 36 attached to the rotary shaft 10 with its open end facing downward through an intermediate passage 35 formed by a radial gap on the outer side of the inner fixed ring 34, and a radial direction on the outer side of the rotary ring 36. An upper bottom wall 27 of the partition wall body 27 through an outer passage 37 formed of a gap.
An outer fixed ring 38 protruding downward from the inner diameter portion of a is arranged concentrically with each other.
35 and 35 are opened to the partition chamber 31 at each lower end and are continuously provided at the lower folded portion 39 along the lower inner and outer peripheral surfaces of the rotary ring 36, and the intermediate passage 35 and the inner passage 33 of the rotary ring 36. The inner bottom surface and the upper end edge of the inner fixed ring 34 are connected to each other through an axial gap 40, that is, the outer passage 37, the intermediate passage 35, and the inner passage 33 are sequentially connected to each other to form a folded passage 41 that is folded back up and down. Has been done.
また、この折り返し通路41の仕切室31に開放された下方
折り返し部39に近接して環状の永久磁石42または複数個
を環状に配列した永久磁石42が内側固定環34または外側
固定環38などに取着されて仕切室31に配設されている。Further, an annular permanent magnet 42 or a permanent magnet 42 in which a plurality of annular magnets are arranged in an annular shape is provided in the inner fixed ring 34, the outer fixed ring 38, or the like in the vicinity of the lower folded portion 39 opened to the partition chamber 31 of the folded passage 41. It is attached and arranged in the partition chamber 31.
また、主ポンプ羽根車24の軸推力を軽減するために主ポ
ンプ羽根車24の背面側壁43と仕切壁体27の外周部との間
に設けられた狭い半径方向隙間を有する固定オリフィス
44および主ポンプ羽根車24の背面側壁43の内径部に削設
されたバランスホール45の作用によって、前記固定オリ
フィス44より内径側の主ポンプ羽根車24の背面側壁43と
仕切壁体27の上底壁27aとの間のポンプ後側室46が主ポ
ンプ羽根車24の吸込側の圧力に近い主ポンプ低圧部とな
っており、この主ポンプ低圧部であるポンプ後側室46に
前記折り返し通路41が外側通路37の上端部において仕切
壁体27の上底壁27aと主ポンプ羽根車24のボス部29との
隙間30を介して連接され、前記折り返し通路41の内側通
路33の下端部がアダプタ４の軸貫通部4aと回転軸10との
隙間22に連接されており、すなわち主ポンプ部２の低圧
部とキャンドモータ部３とが折り返し通路41およびアダ
プタ４の軸貫通部4aと回転軸10との隙間22を介して連通
されている。Further, in order to reduce the axial thrust of the main pump impeller 24, a fixed orifice having a narrow radial gap provided between the rear side wall 43 of the main pump impeller 24 and the outer peripheral portion of the partition wall body 27.
Due to the action of the balance hole 45 formed in the inner diameter portion of the rear side wall 43 of the main pump impeller 24 and the rear side wall 43 of the main pump impeller 24 and the partition wall body 27 on the inner diameter side of the fixed orifice 44. The pump rear side chamber 46 between the bottom wall 27a and the main pump low pressure portion near the suction side pressure of the main pump impeller 24 is the main pump low pressure portion. At the upper end of the outer passage 37, the partition wall 27 is connected via the gap 30 between the upper bottom wall 27a and the boss portion 29 of the main pump impeller 24, and the lower end of the inner passage 33 of the folding passage 41 is connected to the adapter 4 Of the main pump portion 2 and the canned motor portion 3 are connected to the gap 22 between the shaft penetrating portion 4a and the rotating shaft 10 of the main pump portion 2 and the shaft penetrating portion 4a of the adapter 4 and the rotating shaft 10. Are communicated with each other through a gap 22.
次に、このように構成された実施例の作用について説明
する。Next, the operation of the embodiment thus configured will be described.
前記ポンプ１を運転すると、主ポンプ部２のポンプ作用
によってボイラ循環水が主ポンプ部２の吸込口25および
吐出口26に接続された図示しないボイラ循環経路をこの
循環経路に最初から残存している溶接時のノロ、スパッ
タや後日発生する鉄錆などの磁性体異物を混在して循環
され、また補助ポンプ５のポンプ作用によって清水が補
助ポンプ５からスラスト軸受13、下部ラジアル軸受12、
固定子キャン８と回転子キャン９との隙間20、上部ラジ
アル軸受11、通孔16、循環パイプ17、熱交換器18、循環
パイプ19を経て補助ポンプ５の吸込側15に至るキャンド
モータ循環経路を循環されてキャンドモータ部３の冷却
と各軸受11，12，13の潤滑が行なわれる。When the pump 1 is operated, the boiler circulating water is left by the pump action of the main pump unit 2 from the beginning in the boiler circulation route (not shown) connected to the suction port 25 and the discharge port 26 of the main pump unit 2. Are spilled during welding, magnetic foreign substances such as spatter and iron rust generated at a later date are mixed and circulated, and the pumping action of the auxiliary pump 5 causes fresh water to flow from the auxiliary pump 5 to the thrust bearing 13, the lower radial bearing 12,
A canned motor circulation path from the gap 20 between the stator can 8 and the rotor can 9, the upper radial bearing 11, the through hole 16, the circulation pipe 17, the heat exchanger 18, and the circulation pipe 19 to the suction side 15 of the auxiliary pump 5. Are circulated to cool the canned motor unit 3 and lubricate the bearings 11, 12, and 13.
また、主ポンプ羽根車24に付勢されたボイラ循環水の一
部は、主ポンプ羽根車24の吐出側から固定オリフィス4
4、ポンプ後側室46、バランスホール45、主ポンプ羽根
車24の吸込側と循環されるが、ボイラ循環水とともに循
環される磁性体異物がその比重が水より大なるためにポ
ンプ後側室46からバランスホール45へ至る際に主ポンプ
羽根車24のボス部29と仕切壁体27の上底壁27aとの隙間3
0に侵入することがある。Further, a part of the boiler circulating water urged by the main pump impeller 24 is fixed to the fixed orifice 4 from the discharge side of the main pump impeller 24.
4, the pump rear chamber 46, the balance hole 45, and the suction side of the main pump impeller 24 are circulated, but the magnetic foreign matter circulated along with the boiler circulating water has a specific gravity greater than that of water. When reaching the balance hole 45, the gap 3 between the boss portion 29 of the main pump impeller 24 and the upper bottom wall 27a of the partition wall body 3
May break into 0.
しかし、この隙間30に侵入した磁性体異物は、折り返し
通路41の外側通路37を落下してその一部は永久磁石42に
その磁気吸引力にて吸着され、残りは仕切室31の下底部
に落下して堆積され、また一旦堆積された磁性体異物は
前記回転環36が外側固定環38に覆われていることにより
仕切室31には前記回転環36の回転に起因する回流が殆ん
ど生じないため再び移動されることはない。However, the magnetic foreign matter that has entered the gap 30 falls in the outer passage 37 of the folding passage 41, and a part of the foreign matter is adsorbed by the permanent magnet 42 by its magnetic attraction force, and the rest is in the lower bottom portion of the partition chamber 31. The magnetic foreign matter that has fallen and accumulated, and once deposited, has almost no circulatory flow due to the rotation of the rotary ring 36 in the partition chamber 31 because the rotary ring 36 is covered by the outer fixed ring 38. It will not occur and will not be moved again.
また、万一、磁性体異物が永久磁石42に吸着されずに下
方折り返し部39から中間通路35に侵入したとしてもキャ
ンドモータ部３側の清水が漏れ出さない限り、主ポンプ
部２のボイラ循環水とキャンドモータ部３の清水との温
度変化の差に基づいて清水の体積が圧縮減少される程度
ではそれによる折り返し通路41の液の移動は実際上無視
し得る程度で、中間通路35に侵入した磁性体異物を上方
へ移動させる作用はなく、かつ磁性体異物が水より比重
が大なるため、この磁性体異物は中間通路35を上方へ移
動することなく再び落下されて永久磁石42に吸着され、
または仕切室31の下底部に堆積される。In addition, even if a magnetic foreign substance is not adsorbed by the permanent magnet 42 and enters the intermediate passage 35 from the lower turn-back portion 39, as long as fresh water on the canned motor portion 3 side does not leak, the boiler circulation of the main pump portion 2 is performed. When the volume of the fresh water is compressed and reduced based on the difference in temperature change between the water and the fresh water of the canned motor unit 3, the movement of the liquid in the return passage 41 due to it is practically negligible, and enters the intermediate passage 35. Since there is no action to move the magnetic foreign material upward and the specific gravity of the magnetic foreign material is larger than that of water, the magnetic foreign material is dropped again without moving upward in the intermediate passage 35 and attracted to the permanent magnet 42. Is
Alternatively, it is deposited on the lower bottom of the partition chamber 31.
従って、主ポンプ羽根車24のボス部29と仕切壁体27の上
底壁27aとの隙間30から落下侵入する磁性体異物は、全
て永久磁石42に吸着されるか仕切室31の下底部に堆積さ
れてキャンドモータ部３へは侵入されず、この磁性体異
物の侵入による各軸受11，12，13の異常摩耗が阻止され
る。Therefore, all the magnetic foreign matters that fall and enter through the gap 30 between the boss portion 29 of the main pump impeller 24 and the upper bottom wall 27a of the partition wall body 27 are adsorbed by the permanent magnets 42 or on the lower bottom portion of the partition chamber 31. It is accumulated and does not enter the canned motor unit 3, and abnormal wear of the bearings 11, 12, 13 due to the intrusion of the magnetic foreign matter is prevented.
本考案によれば、第３図に示すような従来構造のボイラ
循環用キャンドモータポンプの簡単な改造により、ボイ
ラ循環経路に最初から残存している溶接時のノロ、スパ
ッタや後日発生する鉄錆などボイラ循環水に混在されて
いる磁性体異物は、その比重が水より大きいことによる
キャンドモータ部３への落下が上下に折り返した折り返
し通路41にて妨げられるとともにその全てが仕切室31の
永久磁石42に吸着されあるいは仕切室31の下底部に堆積
されてキャンドモータ部３へは侵入されず、磁性体異物
の侵入による各軸受11，12，13の異常摩耗が阻止されて
信頼性の高いボイラ循環用キャンドモータポンプが得ら
れるものである。According to the present invention, the canned motor pump for boiler circulation having a conventional structure as shown in FIG. 3 is simply modified so that welding slag, spatter, and iron rust that will remain in the boiler circulation path from the beginning during welding will occur. The magnetic foreign matter mixed in the boiler circulating water is prevented from falling to the canned motor unit 3 due to its specific gravity being larger than water by the return passage 41 which is turned upside down, and all of them are permanently set in the partition chamber 31. It is attracted to the magnet 42 or deposited on the lower bottom of the partition chamber 31 and does not enter the canned motor unit 3, and abnormal wear of the bearings 11, 12, 13 due to the intrusion of magnetic foreign matter is prevented, which is highly reliable. A canned motor pump for circulating a boiler is obtained.
第１図は本考案の一実施例を示すボイラ循環用キャンド
モータポンプの縦断面図、第２図は同上主ポンプ部の拡
大縦断面図、第３図は従来のキャンドモータポンプの縦
断面図である。 ２……主ポンプ部、３……キャンドモータ部、４……ア
ダプタ、4a……軸貫通部、５……補助ポンプ、23……主
ポンプ室、24……主ポンプ羽根車、31……仕切室、33…
…内側通路、34……内側固定環、35……中間通路、36…
…回転環、37……外側通路、38……外側固定環、39……
下方折り返し部、41……折り返し通路、42……永久磁
石。FIG. 1 is a vertical sectional view of a canned motor pump for circulating a boiler showing an embodiment of the present invention, FIG. 2 is an enlarged vertical sectional view of a main pump portion of the same as above, and FIG. 3 is a longitudinal sectional view of a conventional canned motor pump. Is. 2 ... Main pump part, 3 ... Canned motor part, 4 ... Adapter, 4a ... Shaft penetrating part, 5 ... Auxiliary pump, 23 ... Main pump chamber, 24 ... Main pump impeller, 31 ... Partition room, 33 ...
… Inner passage, 34 …… Inner fixed ring, 35 …… Intermediate passage, 36…
… Rotating ring, 37 …… outer passage, 38 …… outer fixed ring, 39 ……
Lower folding part, 41 ... Folding passage, 42 ... Permanent magnet.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭48−51301（ＪＰ，Ａ) ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-48-51301 (JP, A)
Claims (1)
ポンプ部を上側に前記キャンドモータ部を下側にしてア
ダプタを介して液密に一体に接続し、前記キャンドモー
タ部に液密に一体に構成した補助ポンプにて前記キャン
ドモータ部内に主ポンプ取扱液とは別の清水を循環させ
る独立したキャンドモータ循環経路を有する縦型キャン
ドモータポンプにおいて、 前記アダプタと主ポンプ羽根車との間に主ポンプ室と区
画した仕切室を設け、この仕切室の内径部に、回転軸と
の間に半径方向隙間からなる内側通路を介して前記アダ
プタから上方へ突出した内側固定環と、この内側固定環
の外側に半径方向隙間からなる中間通路を介して前記回
転軸に開放端を下方にして取着したカップ状の回転環
と、この回転環の外側に半径方向隙間からなる外側通路
を介して前記仕切室の上端部から下方へ突出した外側固
定環とをそれぞれ同心に配設して、前記外側通路と前記
中間通路および前記内側通路を連設した折り返し通路を
形成し、この折り返し通路の前記仕切室に開放された下
方折り返し部に近接して前記仕切室に環状に永久磁石を
配設し、前記主ポンプ部の低圧部と前記キャンドモータ
部とを前記折り返し通路および前記アダプタの軸貫通部
と前記回転軸との隙間を介して連通したことを特徴とす
るボイラ循環用キャンドモータポンプ。1. A main pump section and a canned motor section are integrally liquid-tightly connected to each other through an adapter with the main pump section on the upper side and the canned motor section on the lower side. In a vertical canned motor pump having an independent canned motor circulation path that circulates fresh water different from the main pump handling liquid in the canned motor part by an integrally constructed auxiliary pump, between the adapter and the main pump impeller. Is provided with a partition chamber that is partitioned from the main pump chamber, and an inner fixing ring that protrudes upward from the adapter via an inner passage that is a radial gap between the partition chamber and the inner side of the partition chamber; A cup-shaped rotary ring attached to the rotary shaft with its open end facing downward through an intermediate passage having a radial gap on the outer side of the fixed ring, and an outer ring having a radial gap on the outer side of the rotary ring. Outer fixed rings projecting downward from the upper end of the partition chamber via side passages are arranged concentrically to form a folded passage in which the outer passage, the intermediate passage, and the inner passage are connected in series. A permanent magnet is annularly disposed in the partition chamber in the vicinity of a lower folding portion open to the partition chamber of the folding passage, and the low pressure portion of the main pump portion and the canned motor portion are connected to the folding passage and the A canned motor pump for circulating a boiler, wherein the shaft penetrating portion of the adapter and the rotary shaft communicate with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985161719U JPH0618078Y2 (en) | 1985-10-22 | 1985-10-22 | Boiler circulation canned motor pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985161719U JPH0618078Y2 (en) | 1985-10-22 | 1985-10-22 | Boiler circulation canned motor pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6269094U JPS6269094U (en) | 1987-04-30 |
| JPH0618078Y2 true JPH0618078Y2 (en) | 1994-05-11 |
Family
ID=31088294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985161719U Expired - Lifetime JPH0618078Y2 (en) | 1985-10-22 | 1985-10-22 | Boiler circulation canned motor pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0618078Y2 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5128841B2 (en) * | 1971-10-26 | 1976-08-21 | ||
| JPS5347364U (en) * | 1976-09-27 | 1978-04-21 | ||
| JPS54132031U (en) * | 1978-03-07 | 1979-09-13 | ||
| JPS5662142U (en) * | 1979-10-19 | 1981-05-26 | ||
| JPS56118740U (en) * | 1980-02-14 | 1981-09-10 | ||
| JPS60151545U (en) * | 1985-02-21 | 1985-10-08 | 日本電気株式会社 | Equipment for removing iron-based impurities in gas |
-
1985
- 1985-10-22 JP JP1985161719U patent/JPH0618078Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6269094U (en) | 1987-04-30 |
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