JPS58143189A - Pump starting device for pump unit - Google Patents
Pump starting device for pump unitInfo
- Publication number
- JPS58143189A JPS58143189A JP2633382A JP2633382A JPS58143189A JP S58143189 A JPS58143189 A JP S58143189A JP 2633382 A JP2633382 A JP 2633382A JP 2633382 A JP2633382 A JP 2633382A JP S58143189 A JPS58143189 A JP S58143189A
- Authority
- JP
- Japan
- Prior art keywords
- pump
- tank
- casing
- liquid
- suction
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/02—Self-priming pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【発明の詳細な説明】
こＯｉａ明は、それ自体に自吸能力を有しない卑容積委
のポンプを貯液タンクに設置してなるボンブエエッ）に
おいて、ポンプに合せて鋏備される自吸用補助タンクに
よつてポンプを起動し得るようになしたポンプ起動装置
に関するものである。[Detailed description of the invention] This Oia Ming is a self-priming pump that is installed in a storage tank with a low-capacity pump that does not have self-priming ability. The present invention relates to a pump starting device capable of starting a pump using an auxiliary tank.
本発明は、自吸用の補助タンクとして下部タンクをポン
プの下方に、上部タンクな外周に配置することによりポ
ンプユニットを設置する投影床面積を縮少させ、装置の
小型軽量化、取扱いの簡素化を図るとと本に、吸上管を
貯溜タンクの下方忙開口させてポンプの自吸可能な吸上
げ高さの笥囲を高めてポンプ作動の確動守定仕を図るこ
とを目的とする。The present invention reduces the projected floor area on which the pump unit is installed by arranging the lower tank as an auxiliary tank for self-priming below the pump and around the outer periphery of the upper tank, making the device smaller and lighter, and easier to handle. The purpose of this project is to open the suction pipe downwardly in the storage tank to increase the suction height that allows the pump to self-prime, and to ensure reliable operation of the pump. do.
以下本発明を５１！施例に基づいて説明する。本例のポ
ンプ起動装置け、第１図のように貯溜タンク（主タンク
ともいう）１に設置されたポンプ２におけるケーシング
４の外回シに自吸用の下部タンク１３と上部タンク１４
とを設置している。まずポンプ２は、ブラケット３を介
してモータ６により駆動される公知の多段遠心型が採用
されてお〕、主タンク１の上蓋１＆Ｋｆｆ脱可能に設置
されたポンプ２におけるケーシング４内の各１ｉ！５毎
に、モー＃６によ）回転される軸７に連結した羽根車ｅ
が６段Ｋｌうて配設されている。Below are 51 details of the present invention! This will be explained based on an example. As shown in FIG. 1, the pump starting device of this example has a lower tank 13 and an upper tank 14 for self-priming on the outer side of a casing 4 in a pump 2 installed in a storage tank (also called a main tank) 1.
and has been set up. First, the pump 2 is a known multi-stage centrifugal type driven by a motor 6 via a bracket 3], and the upper lid 1 & Kff of the main tank 1 are removably installed in each 1i! every 5, an impeller e connected to a shaft 7 rotated (by motor #6)
are arranged vertically in 6 stages.
斯るポンプ２にあって、ケーシング４の底部４＆の中央
に、吸込口９が形成されて＞ｂ、この吸込口９に合せて
円筒形の吸込管１０が垂設されている。＠込管１０は、
吸込口９に１通ずる吸込路１１を形成して吸込口９を実
質的に下方へ有効に延長している。１２は上段室５と連
通されたポンプの吐出管で、ポンプユニ、トにおける他
装置に接続す嘴し管は図示省略する。In such a pump 2, a suction port 9 is formed in the center of the bottom 4& of the casing 4, and a cylindrical suction pipe 10 is vertically arranged in line with the suction port 9. @Include pipe 10 is
A suction passage 11 is formed that communicates with the suction port 9 to effectively extend the suction port 9 substantially downward. 12 is a discharge pipe of the pump communicating with the upper chamber 5, and a beak pipe connected to other devices in the pump unit is not shown.
前ｌａｏケーＶング４には、ケーシングの底部４＆側に
形成された下部タンク１３とケーシングの筒部４ｂ偶に
形成された上部タンク１４とが装着され、下部タンク１
３と上部タンク１４とは通路１５で連通している。そし
て下部タンクＩ％１３の下部１６に／ｆｉ鋳記後記吸込
管１０端が開口している。A lower tank 13 formed on the bottom 4 side of the casing and an upper tank 14 formed on the cylindrical portion 4b of the casing are attached to the front lao casing V-ring 4.
3 and the upper tank 14 are communicated through a passage 15. The end of the suction pipe 10 is opened in the lower part 16 of the lower tank I%13.
１Ｉｉｒ紀ケーＶング４の筒部４ｂと上部タンク１４と
は連通孔１７で連通され、また上部タンク１６に吸上管
１８が垂下連結されている。上記連通孔１７は、ポンプ
停止時にケーシング４内の空気を上部タンク１４へ流入
可能とするための４ので、小孔とされそして中段の室５
を連通するレベルに設置されている。一方上鮎吸上管１
８は、ポンプ作用に適した内径とされその開口下端を前
記主タンク１の貯液Ｗ中に没入している。そしてポンプ
停止時に上部タンク１４内のＷＩ面レベルを所！位智に
保持するなめに、同タンク１４と連通する吸上管１８の
開口上端１９を、下段の羽根車８よ）上方に設定して前
記連通孔１７と連通可能にされている。またポンプ起動
時に下部タンク１３内の液面が吸込管１０の下端部まで
低下しないうちに＠上管１８内を貯液Ｗが上昇して下部
タンク１３に補給されるようにするため罠、下部タンク
１１０内容積であって吸込管１０の下端以上でかつ吸込
管１０の外春積を除いた容積が吸上管１８の内容積よ如
充分大きく設定されている。The cylindrical portion 4b of the 1Iir case Ving 4 and the upper tank 14 are communicated with each other through a communication hole 17, and a suction pipe 18 is connected to the upper tank 16 in a downward manner. The communication hole 17 is a small hole to allow air in the casing 4 to flow into the upper tank 14 when the pump is stopped, and the middle chamber 5
It is installed at a level that communicates with the On the other hand, upper sweetfish suction pipe 1
Reference numeral 8 has an inner diameter suitable for pumping action, and its opening lower end is immersed in the liquid storage W of the main tank 1. Then, when the pump is stopped, check the WI surface level in the upper tank 14! In order to keep it in position, the open upper end 19 of the suction pipe 18 communicating with the tank 14 is set above the lower impeller 8 so that it can communicate with the communication hole 17. In addition, in order to allow the stored liquid W to rise in the upper pipe 18 and be replenished to the lower tank 13 before the liquid level in the lower tank 13 drops to the lower end of the suction pipe 10 when the pump is started, a trap is installed in the lower part. The internal volume of the tank 110, which is equal to or larger than the lower end of the suction pipe 10 and excludes the outer spring volume of the suction pipe 10, is set to be sufficiently larger than the internal volume of the suction pipe 18.
前述のように構成された本例装置のポンプ作動について
要約説明する。ポンプ起動に先立ち、まず初めに呼び液
を呼び液口から注入する。この結果第１＃４のように呼
び液Ｗ′が、ケーシング４内の下段、中段の各１ｉ！５
及び吸込管１０の吸込路１１そして下部タンク１５及び
上部タンク１４内にＩ力貯溜されて吸上管１８の開口上
端１９（図示ＣＹベベルまで充填する。かくして、ポン
プの起動準備が売子する。なおＣレベル以上に注入され
る余分な呼び液は、＠土管、１日を介して主タンク１の
貯溜Ｗ４Ｒされる。A summary explanation will be given of the pump operation of this example device configured as described above. Before starting the pump, first inject the priming liquid through the priming port. As a result, as shown in No. 1 #4, the priming liquid W' is applied to each of the lower and middle stages of the casing 4 to 1i! 5
The I force is stored in the suction passage 11 of the suction pipe 10, the lower tank 15, and the upper tank 14, and the suction pipe 18 is filled up to the opening upper end 19 (CY bevel shown).In this way, the pump is ready to start. It should be noted that the excess priming liquid injected above the C level is stored in the main tank 1 W4R through @earth pipe and one day.
このもとでポンプ２を起動すると、呼び液中の各羽根車
８０回転に伴なうポンプ作用により第２閣のようにヶ、
−シング４の各室５内の液体Ｗ′が順次吸とげられて吐
出管１２から他岐着へ給送される一方、下部タンク１３
内の呼び液Ｗ′が張込管１０の畷込路１１及び吸込口９
を流通して各室５内に９込まれる。下部タンク１３内の
呼び液の液面の低下に伴ない上部タンク１４内の液面も
低下して負圧とな力、これに起因して主タンク１内Ｏ貯
液Ｗが吸上管１８を上昇して吸上げられ遂には開口上端
１９から通路１５を介して下部タンク１５内に補給され
、以降貯液の補給のもとてポンプ作動が継続される。When the pump 2 is started under this condition, the pump action caused by the 80 revolutions of each impeller in the priming liquid causes the pump to move like the second cabinet.
- The liquid W' in each chamber 5 of the thing 4 is sucked up one after another and fed from the discharge pipe 12 to the other terminals, while the lower tank 13
The priming liquid W' in
is distributed into each chamber 5. As the liquid level of the priming liquid in the lower tank 13 decreases, the liquid level in the upper tank 14 also decreases, resulting in negative pressure, which causes the O liquid stored in the main tank 1 to flow into the suction pipe 18. The liquid rises and is sucked up, and is finally replenished into the lower tank 15 through the passage 15 from the opening upper end 19, and thereafter the pump operation is continued by replenishing the stored liquid.
特に上記ポンプ起動については、前述の下部タンク１３
０専横が重要な機能をはたす、すなわち下部タンク１３
の内容積であって吸込管１０の下端以上でかつ吸込管１
０の外容積を除いた容積が吸上管１８の内容積よ）充分
大きく設定されている。したがうでポンプ起動の開始に
つれて下部タンク１３内の液が吸込管１０の下端部（図
示Ｂレベル）に低下するまでの関に＠上管１８内を貯液
Ｗが上昇して遂には下部タンク１３Ｋｌｌｆ１給される
のでポンプ作動が継続し得る。従って例えばポンプ２の
高速運転によ）下部！ンク１３内の液が比較的早く減少
しようと４、上記Ｂレベルまでに低下する間に下部タン
ク１３内の電圧変化に伴ない前述のように貯液Ｗを有効
かつ充分に吸上げ補給し得るので、貯溜の補給遅れや補
給不足をなくして適切な補給を確保し得る。これによ〕
下部タンり１３内の液がＢｖレベルり低下すること、こ
れに伴ないポンプ作動が空運転となって吸上停止するこ
と、等の事態を積極的に回避して円滑なポンプ作動を常
に安定して継続できる。Especially for starting the pump, the above-mentioned lower tank 13
0 monopolization performs an important function, namely the lower tank 13
The internal volume of the suction pipe 10 is greater than or equal to the lower end of the suction pipe 10, and
The volume excluding the external volume of 0 is set to be sufficiently large (the internal volume of the suction pipe 18). Therefore, as the pump starts to start, until the liquid in the lower tank 13 drops to the lower end of the suction pipe 10 (level B in the figure), the stored liquid W rises in the upper pipe 18 and finally reaches the lower tank 13Kllf1. pump operation can continue. Therefore, for example due to high speed operation of pump 2) lower part! Although the liquid in the tank 13 decreases relatively quickly, the stored liquid W can be effectively and sufficiently sucked up and replenished as described above as the voltage changes in the lower tank 13 while the liquid decreases to the level B. Therefore, it is possible to eliminate delays in replenishment and shortages in storage and ensure appropriate replenishment. For this]
Smooth pump operation is always maintained by proactively avoiding situations such as the liquid in the lower tank 13 dropping to the Bv level and the pump operation running dry due to this and stopping suction. You can continue by doing so.
なおポンプ作動中連通孔１７から液洩れするとしても少
量であることからポンプ効率の損失は極めて小プい。Even if liquid leaks from the communication hole 17 during pump operation, it is only a small amount, so the loss of pump efficiency is extremely small.
次に所定量の送液をなしてポンプ２を停止するときの作
動について説明する。吐出管１２、ケーシング４、吸込
管１ａ、下部タンク１３、通路１５゜ト部タンク１４及
び吸上管１８内の液が、サイホン作用により主タンク１
側に逆流する。この過程で連通孔１７が重要な機能を果
し、ケーシング４内のｉｌＩ面が連通孔１７まで下降す
るとケーシング４内の空電が連通孔１７を経て上部タン
ク１４内に流入されることＫよ郵、緒条的にケーシング
４及び下部タンク１３内の液面レベルは、吸上管１８の
開口上端１９（図示Ｃレベル）よ〕低下することなく゛
吸上管１８内の液面のみが低下することになカ第３−〇
状態で安定する。かくして下段の羽根車８の位置（図示
レベル）よ）上方に液が保持されることになル、ポンプ
２が再起動可能とされる。Next, the operation when stopping the pump 2 after feeding a predetermined amount of liquid will be explained. The liquid in the discharge pipe 12, casing 4, suction pipe 1a, lower tank 13, passage 15° tank 14, and suction pipe 18 flows into the main tank 1 by siphon action.
backflow to the side. In this process, the communication hole 17 plays an important function, and when the ilI surface in the casing 4 descends to the communication hole 17, static electricity in the casing 4 flows into the upper tank 14 through the communication hole 17. Technically, the liquid level in the casing 4 and the lower tank 13 does not fall below the opening upper end 19 of the suction pipe 18 (level C in the figure), and only the liquid level in the suction pipe 18 falls. In particular, it stabilizes in state 3-0. In this way, the liquid is maintained above the position of the lower impeller 8 (level shown), and the pump 2 can be restarted.
なお、図において個別に形成とれ、通路１５で連通畜れ
ている下部タンク１５と上部タンク１４とを一体的に形
成しその他の関係を前述のとお〕とすることも本発明の
要Ｗとする。−１！らに図示連通孔１７には、ポンプの
起動、運転中は閉、停止中は開とする適宜開閉部材を必
要に応じて付設してもよいし、そのように開閉する部材
を付設した連通孔１７によつて上部タンクを大剣に連通
してもよい、ｔた下部タンク１３又は上部タンク１４に
呼び液口を設電してもよい、勿論ポンプ２け一段型式で
もよい。Note that it is also essential to the present invention that the lower tank 15 and the upper tank 14, which are formed separately in the figure and communicated through a passage 15, be integrally formed and other relationships are as described above. . -1! In addition, the illustrated communication hole 17 may be provided with an appropriate opening/closing member as required to close when the pump is started or running, and open when the pump is stopped, or a communication hole provided with such an opening/closing member. 17, the upper tank may be connected to the main tank, or a priming port may be installed in the lower tank 13 or the upper tank 14. Of course, a two-pump, one-stage type may also be used.
このように本発明のポンプ粕動装蓋は、貯溜タンクに設
置した非容積型のポンプに自吸能力を持たせて同タンク
内の液体を吸上げて給送するポンプユニットにおいて、
前記ポンプのケーシングＯ吸込口に連通して軸方向へ延
長した適宜長さの吸込管と、との吸込管の下端をその下
部で開口させケーシングの°、’ ７ Ｋ鋳着され良下
部タンクと、この下部タンクと連通し前記ケーシングの
外周に鋳着され九上部タンクと、この上部タンクに連結
され開口上端を前記貯溜タンクの液中に没入し開口上端
な前記ポンプの最下部の羽根車よ）上方における上部り
シタ内の所定位置に臨ませた吸上管と、前記上部タンク
に形成畜れＩポンプ停止時ｅ’ｃｌｔｌケーＶング内の
空気をこの上部タンク内に流入可能とする連通孔と、を
設けてなるもので、所定量の呼び液を一旦注入すれば以
降は呼び液不要にしてポンプ超勤により下部タンク側の
液を啜込んで給送する一方、ｅｗｘタンクの貯液を吸上
げて補給してポンプ作動を＃＃Ｌ、そしてポンプを停止
して本ケーＶング及び下部タンクに所定量に液を清音確
保して次期ポンプ運転時にはスムーズＫｌｅ液伶動を行
ない得る。As described above, the pump filtration equipment lid of the present invention is a pump unit that provides a self-priming ability to a non-displacement pump installed in a storage tank to suck up and feed liquid in the tank.
A suction pipe of an appropriate length that communicates with the casing O suction port of the pump and extends in the axial direction, and the lower end of the suction pipe is opened at the lower part of the casing, and a good lower tank is formed by molding the casing. , an upper tank that communicates with this lower tank and is cast on the outer periphery of the casing, and an impeller at the lowermost part of the pump that is connected to this upper tank and whose open upper end is immersed in the liquid of the storage tank. ) A suction pipe facing a predetermined position in the upper part of the upper tank and a connection formed in the upper tank to allow air in the e'cltl cage to flow into the upper tank when the pump is stopped. This device is equipped with a hole, and once a predetermined amount of priming liquid is injected, no priming liquid is required after that, and the liquid in the lower tank is sucked in and fed by pump overtime, while the liquid stored in the ewx tank is pumped. The pump is sucked up and replenished, the pump is operated ##L, and the pump is stopped to ensure a predetermined amount of liquid in the main casing and lower tank, allowing smooth Kle liquid movement during the next pump operation.
斯る本羨［において、ケーシングの外図力に補助タンク
を一体に組付は得るととくよ如、鋏璽全体の小型軽量化
１■設置スペースを可及的に小さくし得るとともに、装
置の設置や交換等を賽轟にし得、その上Ｊ１１匁や輸送
等を秦にかつ安価にできる。In this case, it is recommended that the auxiliary tank be integrated with the external force of the casing, so that the overall size and weight of the scissors can be reduced 1. The installation space can be made as small as possible, and the installation space of the device can be In addition, J11 momme, transportation, etc. can be done easily and inexpensively.
特に本発明装置では、前記ケーシングの吸込口に適宜長
さの吸込管を連−し九ことｋよシ、間管の開口下瑠を前
記下部タンクと連通ずる吸入口とし得ることを以−）″
ＣケーＶングの吸込口の有効な延長化を図カ得るので、
ポンプ起動、運転時において下部タンク内の液が吸込管
の下端部に低下するまでの範囲ＫＭＩ）確実に吸込み得
、吸込み能力を高め得る。従ってポンプの空作動、吸込
み不能をなくして費！したポンプ作動ひいては送液を適
確になし得る。In particular, in the device of the present invention, a suction pipe of an appropriate length is connected to the suction port of the casing, and the lower opening of the interpipe can be used as the suction port communicating with the lower tank. ″
Since the suction port of the C cable can be effectively extended,
When the pump is started and operated, the range (KMI) until the liquid in the lower tank drops to the lower end of the suction pipe can be reliably sucked and the suction capacity can be increased. Therefore, you can save money by eliminating dry operation of the pump and inability to suck. The pump operation and thus the liquid delivery can be performed accurately.
上述のように＠上管を砥畏化することに伴ない下部タン
クの容積を大きくする必要があるものの必要最小容積な
以うて九カ大型化を抑制でき、またケーシングの下方へ
砥長されるだけであるから貯溜タンク内の余剰スペース
を利用して何ら無理なく収容でき、＠上管の砥長すなわ
ちポンプの自吸可能な吸上高さの範囲を高くすることに
対する特別な技術を不要とし得る。As mentioned above, although it is necessary to increase the volume of the lower tank due to the grinding of the upper pipe, the required minimum volume can suppress the increase in size, and it is possible to reduce the size of the tank by increasing the size of the tank. Because it is only 100%, it can be accommodated without any difficulty using the surplus space in the storage tank, and there is no need for special technology to increase the height of the upper pipe, that is, the range of the suction height at which the pump can self-prime. It can be done.
図は本発明の実施例を示すもので、＠１図は本例装置を
一部破断して示す正面図、第２図、第３図は夫々ポンプ
作動を例示する説明図である。
１・・・貯溜タンク ２・・・ポンプ４・・・ケ
ーＶング ５・・・室
６−・モータ ８・・・羽横車９・・・吸込
口 １０・・・吸込管１３・・・下部タンク
１４・・・上部タンク１７・・・１１１通孔
１８・・・吸、ト管出 −人 富士電機製造株
式会社
代 珊 人 弁理士 岡 １）英 彦第１図
第２ＷＪThe drawings show an embodiment of the present invention, and Fig. 1 is a partially cutaway front view of the device of the present invention, and Figs. 2 and 3 are explanatory diagrams illustrating pump operation, respectively. 1... Storage tank 2... Pump 4... Case Ving 5... Chamber 6-- Motor 8... Wing wheel 9... Suction port 10... Suction pipe 13... lower tank
14... Upper tank 17... 111 hole
18... Intake, Tokane - Person Fuji Electric Manufacturing Co., Ltd. Representative San San Patent attorney Oka 1) Hidehiko Figure 1 Figure 2 WJ
Claims (1)
走せて同タンク内の液体を吸上げて輸送するポンプユニ
ットにおいて、前記ポンプのケーシングの吸込口に連通
して軸方肉へ砥畏した適宜最さの吸込管と、この吸込管
の下端をその下部で開口さ′せ、ケーシングの下方に装
着された下部タンクと、この下部タンクと連通し前記ケ
ーシングの外周（装着きれた上部タンクと、この、ト部
タンクに連結され開口下端を前記貯溜タンクの液中に没
入し開口上端を前記ポンプの量下部の羽櫻車より上方に
かける上部タンク内の所定位ｆｌｌＫ瑠重せた１１）、
管と、１ＩＩＩ記上部タンクに形成されポンプ停止時Ｋ
ｌＩＩ紀ケーＶング内の９幇をこの上部タンク内に流入
可能とする連通孔と、を設けてなるを特徴とするポンプ
起動物置。Installed in a storage tank to provide self-priming capability to a non-displacement pump.
In a pump unit that runs to suck up and transport liquid in the same tank, a suitably highest suction pipe that communicates with the suction port of the pump casing and is ground to the axial wall, and a lower end of this suction pipe. A lower tank is opened at the lower part of the casing and is connected to the outer periphery of the casing. 11), immersed in the liquid in the tank and placed the upper end of the opening above the impeller wheel at the bottom of the pump at a predetermined position in the upper tank;
The pipe is formed in the upper tank described in 1III and K when the pump is stopped.
A pump-starting shed characterized by being provided with a communication hole that allows nine pipes in the III period cage to flow into the upper tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2633382A JPS58143189A (en) | 1982-02-19 | 1982-02-19 | Pump starting device for pump unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2633382A JPS58143189A (en) | 1982-02-19 | 1982-02-19 | Pump starting device for pump unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58143189A true JPS58143189A (en) | 1983-08-25 |
| JPS646357B2 JPS646357B2 (en) | 1989-02-02 |
Family
ID=12190496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2633382A Granted JPS58143189A (en) | 1982-02-19 | 1982-02-19 | Pump starting device for pump unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58143189A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62191U (en) * | 1985-06-15 | 1987-01-06 | ||
| EP2505842B1 (en) | 2011-03-29 | 2019-12-25 | Grundfos Management a/s | Multi stage centrifugal pump system |
-
1982
- 1982-02-19 JP JP2633382A patent/JPS58143189A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62191U (en) * | 1985-06-15 | 1987-01-06 | ||
| EP2505842B1 (en) | 2011-03-29 | 2019-12-25 | Grundfos Management a/s | Multi stage centrifugal pump system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS646357B2 (en) | 1989-02-02 |
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