JPH07286594A - Submerged pump - Google Patents
Submerged pumpInfo
- Publication number
- JPH07286594A JPH07286594A JP7836494A JP7836494A JPH07286594A JP H07286594 A JPH07286594 A JP H07286594A JP 7836494 A JP7836494 A JP 7836494A JP 7836494 A JP7836494 A JP 7836494A JP H07286594 A JPH07286594 A JP H07286594A
- Authority
- JP
- Japan
- Prior art keywords
- pump
- casing
- liquid
- pumping pipe
- submerged
- 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
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は液化ガス用サブマージド
ポンプの改良に係り、特に、液化天然ガスタンク内に挿
入された揚液管内に垂下着座されるサブマージドポンプ
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved submerged pump for liquefied gas, and more particularly to a submerged pump which is drooped and seated in a pumping pipe inserted in a liquefied natural gas tank.
【０００２】[0002]
【従来の技術】一般に、貯槽タンク内の液化ガス等を排
出するために使用されるポンプとして、種々のサブマー
ジドポンプが知られている。2. Description of the Related Art Generally, various submerged pumps are known as pumps used for discharging liquefied gas in a storage tank.
【０００３】この使用例を図２に示す全体概念図により
説明する。可燃性の液化ガスの貯槽タンク１からの吸上
げは、貯槽タンク１の上部より貯槽液内に挿入設置され
た揚液管２内に、巻上機を介してワイヤ４により吊り下
げて揚液管２の底部に着座されたサブマージドポンプ３
により行われれる。An example of this use will be described with reference to an overall conceptual diagram shown in FIG. The suction of the combustible liquefied gas from the storage tank 1 is performed by suspending the liquefied gas in the storage tank 1 from the upper part of the storage tank 1 in the pumping pipe 2 by a wire 4 to suspend the pumping. Submerged pump 3 seated on the bottom of pipe 2
It is done by.
【０００４】この種の装置には、特開平1−177493 号公
報に記載のものが挙げられ、ポンプ一時停止後の再起動
時の送液効率の改良のため、一端揚液管２内を通して持
ち上げた揚液が逆流しないようポンプ吐出口８に逆止弁
を設けること、また、点検のためポンプ３を吊り上げる
際、ポンプ３上部に位置する揚液の圧力により過大な吊
り荷重を必要としないですむよう、ケーシング頂部に遠
隔操作できる開閉弁を設けることが論じられている。An example of this type of device is that described in Japanese Patent Laid-Open No. 1-177493, and in order to improve the liquid transfer efficiency when the pump is restarted after being temporarily stopped, it is lifted through the pumping pipe 2 once. In order to prevent backflow of the pumped liquid, a check valve is provided at the pump discharge port 8 and when lifting the pump 3 for inspection, there is no need for an excessive lifting load due to the pressure of the pumped liquid located above the pump 3. Therefore, it is discussed to provide a remotely operated on-off valve at the top of the casing.
【０００５】[0005]
【発明が解決しようとする課題】上記従来技術で揚液管
２の逆流を抑えるために吐出口８に逆止弁を設置した場
合は、起動中のポンプ３を一端停止し短時間で再起動す
ることを想定した時、モータ部７の残留熱によりケーシ
ング内に閉塞された液化ガスが気化しケーシング内に充
満し、ポンプ部５で昇圧できなくなる可能性があるとい
う問題があった。When a check valve is installed at the discharge port 8 in order to suppress the backflow of the pumping pipe 2 in the above-mentioned conventional technique, the pump 3 being started is temporarily stopped and restarted in a short time. However, there is a problem that the residual heat of the motor unit 7 may vaporize the liquefied gas blocked in the casing and fill the casing, and the pump unit 5 may not be able to raise the pressure.
【０００６】本発明の目的は、揚液管２内の前記ポンプ
３上方に残留した取扱液の逆流を防止しすることにより
送液効率の良い、また、停止時に気化した液化ガスだけ
をケーシングの外に随時排出することができ短時間に停
止起動を繰り返す運転を可能とし、点検時のポンプ３吊
り上げに対して過大な仕様の揚重機を必要としないサブ
マージドポンプを提供することにある。An object of the present invention is to prevent backflow of the handling liquid remaining above the pump 3 in the pumping pipe 2 so that the liquid feeding efficiency is good, and only the liquefied gas vaporized at the time of stop is stored in the casing. It is an object of the present invention to provide a submerged pump which can be discharged to the outside at any time and can be repeatedly stopped and started in a short time, and does not require a lifting machine having excessive specifications for lifting the pump 3 at the time of inspection.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明は揚液管の底部に設けられた座面に垂下着座
し、ケーシング内部を取扱液が流過可能なモータ部７と
ポンプ部５とで構成されるサブマージドポンプにおい
て、吸込口に逆止弁を設置すると共に、ケーシング頂部
にガス抜き弁を設けたものである。In order to achieve the above object, the present invention provides a motor portion 7 which is drooped and seated on a seating surface provided at the bottom of a pumping pipe and through which a handling liquid can flow through the inside of a casing. In a submerged pump including the pump unit 5, a check valve is installed at the suction port and a gas vent valve is installed at the top of the casing.
【０００８】[0008]
【作用】本発明のサブマージドポンプによれば、サブマ
ージドポンプの起動により、貯槽タンク１内の液化ガス
はポンプ吸込口より吸引された後、吐出口８より吐出さ
れて揚液管２内を満たし、タンク外部へと送液される。
また、ポンプの運転を停止すると、揚液管２底部でポン
プ吸込口に設けた逆止弁で閉塞されるため、ポンプ部５
の内部を含む揚液管２内の揚液は貯留したままの状態と
なる。According to the submerged pump of the present invention, when the submerged pump is activated, the liquefied gas in the storage tank 1 is sucked from the pump suction port and then discharged from the discharge port 8 to flow inside the pumping pipe 2. Filled and delivered to the outside of the tank.
Further, when the pump operation is stopped, it is blocked by the check valve provided at the pump suction port at the bottom of the pumping pipe 2, so that the pump unit 5
The pumped liquid in the pumped liquid pipe 2 including the inside of the pump remains stored.
【０００９】従って、ポンプを一時停止した後の再起動
時に、揚液管２内を取扱液で満たす必要がなくなり送液
効率が向上できる。また、ポンプ３を一時停止した後、
モータ部７の残留熱により、ケーシング内の液化ガスが
気化した場合、気化したガスのみをケーシング頂部に設
けたガス抜き弁によりケーシングの外部に抜くことによ
り、機器が冷え気化したガスが再度液化し空運転となら
ない状態になるのを待つことなく、即座に再起動可能と
なる。更に、ポンプ吸込口に逆止弁を設けたことによ
り、ケーシング内部は揚液管内と圧力が釣合うため、ポ
ンプの修理，点検などのために巻上機等によりポンプ３
を引揚げる際、引揚げに要する力はほぼポンプ３の自重
だけで済む。Therefore, at the time of restarting after the pump is temporarily stopped, it is not necessary to fill the inside of the pumping pipe 2 with the liquid to be handled, and the liquid feeding efficiency can be improved. Also, after temporarily stopping the pump 3,
When the liquefied gas in the casing is vaporized by the residual heat of the motor unit 7, the vaporized gas is liquefied again by cooling the equipment by venting only the vaporized gas to the outside of the casing by the degassing valve provided at the top of the casing. It is possible to restart immediately without waiting for the state to not become idle. Further, since the check valve is provided at the pump suction port, the pressure inside the casing is balanced with the inside of the pumping pipe, and therefore the pump 3 is used by a hoist or the like for repair and inspection of the pump.
At the time of lifting, the pumping force is required only by the weight of the pump 3.
【００１０】[0010]
【実施例】本発明のサブマージドポンプの実施例につ
き、図１を参照しながら以下詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the submerged pump of the present invention will be described in detail below with reference to FIG.
【００１１】図１は、液化ガス供給用サブマージドポン
プ３を貯槽タンク１内に挿入された揚液管２の底部に着
座した状態の構造図を示す。FIG. 1 is a structural view showing a state in which a submerged pump 3 for supplying a liquefied gas is seated on the bottom of a pumping pipe 2 inserted in a storage tank 1.
【００１２】図１において、サブマージドポンプ３は、
ポンプ部５とモータ部７とからなり、それぞれポンプケ
ーシング９およびモータハウジング１０とからなるケー
シング内に納められている。In FIG. 1, the submerged pump 3 is
The pump unit 5 and the motor unit 7 are housed in a casing composed of a pump casing 9 and a motor housing 10, respectively.
【００１３】また、サブマージドポンプ３は、揚液管２
とポンプケーシング９とが接するは座面１１、及び、底
板６とポンプケーシング９とが接する座面１２に着座し
ている。The submerged pump 3 has a pumping pipe 2
And the pump casing 9 are in contact with each other, and the bottom surface 6 and the pump casing 9 are in contact with each other.
【００１４】ポンプ部５は、複数のインペラ１３と、吸
込口１５から吐出口８までインペラ１３を介して結ぶ流
路を形成するように設けたポンプケーシング９とからな
っており、ポンプ部５に取扱液を導く底板６に設けた吸
込口１５の入口には逆止弁１４を設けている。The pump section 5 comprises a plurality of impellers 13 and a pump casing 9 provided so as to form a flow path connecting the suction port 15 to the discharge port 8 via the impeller 13. A check valve 14 is provided at the inlet of the suction port 15 provided in the bottom plate 6 for guiding the liquid to be handled.
【００１５】一方、モータ部７はステータ組立１６とロ
ータ組立１７とからなり、ロータ軸１８はそれぞれ上部
軸受１９と下部軸受２０により支持されている。On the other hand, the motor section 7 comprises a stator assembly 16 and a rotor assembly 17, and the rotor shaft 18 is supported by an upper bearing 19 and a lower bearing 20, respectively.
【００１６】モータハウジング１０の上部はポンプカバ
ー２１で封鎖され、ポンプカバー２１には上部軸受１９
を支持する上部軸受ハウジング２２が設けられている。
また、ポンプカバー２１の頂部には、フロートにより内
部の液面を感知し液面が下がった時に弁体が開き自動的
にガスのみを抜くガス抜き弁２３が取り付けられてい
る。The upper portion of the motor housing 10 is closed by a pump cover 21, and the pump cover 21 has an upper bearing 19.
An upper bearing housing 22 is provided to support the.
Further, a gas vent valve 23 is attached to the top of the pump cover 21 to sense the internal liquid level by a float and open the valve when the liquid level drops to automatically vent only the gas.
【００１７】以上述べたように構成されたサブマージド
ポンプは次のように動作する。The submerged pump configured as described above operates as follows.
【００１８】すなわち、モータ部７の起動により、ポン
プ部５のインペラ１３が回転し、貯槽タンク１内の取扱
液である液化ガスは、揚液管２の底板６と揚液管２との
隙間から、揚液管２の底板６に設けた逆止弁１４を有す
る吸込口１５を通してインペラ１３に導かれ、吐出口８
より揚液管２内に吐出される。吐出された取扱液は図２
に示す矢印に沿って送液され、揚液管２内を満たした
後、貯槽タンク１外部に送液される。That is, when the motor unit 7 is started, the impeller 13 of the pump unit 5 rotates, and the liquefied gas, which is the liquid to be handled in the storage tank 1, becomes a gap between the bottom plate 6 of the pump pipe 2 and the pump pipe 2. Is guided to the impeller 13 through a suction port 15 having a check valve 14 provided on the bottom plate 6 of the pumping pipe 2, and the discharge port 8
Then, the liquid is discharged into the pumping pipe 2. Figure 2 shows the discharged handling liquid.
The liquid is sent along the arrow indicated by, and after filling the inside of the pumping pipe 2, the liquid is sent to the outside of the storage tank 1.
【００１９】また、送液を中断すべくポンプ３を停止さ
せると、揚液管２内に満たされた取扱液は、逆止弁１
４，座面１１，座面１２，揚液管２の内縁、及びポンプ
ケーシング９の外縁部とにより閉塞され貯留される。When the pump 3 is stopped in order to interrupt the liquid transfer, the liquid to be handled filled in the pumping pipe 2 will be stored in the check valve 1.
4, the seat surface 11, the seat surface 12, the inner edge of the pumping pipe 2, and the outer edge portion of the pump casing 9 close and store.
【００２０】またこの時、運転を止めたモータの残留熱
により、モータ部及びポンプ部の液体の一部が気化した
場合、ポンプカバー２１の頂部に設けたガス抜き弁２３
によってケーシング外に排出される。Further, at this time, when a part of the liquid in the motor section and the pump section is vaporized by the residual heat of the motor which is stopped, the gas vent valve 23 provided on the top of the pump cover 21.
Is discharged to the outside of the casing.
【００２１】サブマージドポンプ３を点検または修理の
ための引き揚げる荷重としては、サブマージドポンプ３
の自重の他に、揚液管２内の液頭と貯槽タンク１の液頭
の差に相当する圧力と、座面１１と座面１２の径方向寸
法の差から決定される環状断面積との積で求まる荷重が
作用する。但し、本構造では、座面１１と座面１２の径
方向寸法の差を小さく抑えることができるので、過大な
揚重機は不要となり経済的である。The load for lifting the submerged pump 3 for inspection or repair includes the submerged pump 3
In addition to its own weight, the pressure corresponding to the difference between the liquid head in the pumping pipe 2 and the liquid head of the storage tank 1, and the annular cross-sectional area determined from the difference in the radial dimension of the seat surface 11 and the seat surface 12 The load determined by the product of However, in this structure, since the difference in the radial dimension between the seat surface 11 and the seat surface 12 can be suppressed to a small value, an excessively heavy lifting machine is not required, which is economical.
【００２２】[0022]
【発明の効果】本発明のサブマージドポンプによれば、
ポンプの運転を停止すると、揚液管の底部でポンプ吸込
口に設けた逆止弁で閉塞され、再起動時に、揚液管内を
取扱液で満たす必要がなくなり送液効率が向上できる。According to the submerged pump of the present invention,
When the operation of the pump is stopped, the bottom of the pump is closed by a check valve provided at the pump suction port, and when the pump is restarted, it is not necessary to fill the inside of the pump with the handling liquid, so that the liquid transfer efficiency can be improved.
【００２３】また、ポンプを一時停止した後、モータ部
の残留熱により、ケーシング内の液化ガスが気化した場
合でも、気化したガスのみをケーシング頂部に設けたガ
ス抜き弁によりケーシングの外部に抜けることから、即
座に再起動可能となる。Further, after the pump is temporarily stopped, even if the liquefied gas in the casing is vaporized by the residual heat of the motor part, only the vaporized gas is discharged to the outside of the casing by the gas vent valve provided at the top of the casing. Therefore, it becomes possible to restart immediately.
【００２４】更に、ポンプ吸込口に逆止弁を設けたこと
により、ケーシング内部は揚液管内と圧力が釣合うた
め、ポンプの修理，点検などのために巻上機等によりポ
ンプを引揚げる際、引揚げに要する力はほぼポンプの自
重だけで済む。Further, since the check valve is provided at the pump suction port, the pressure inside the casing is balanced with the inside of the pump, so that the pump can be lifted by a hoist or the like for repair or inspection. The power required for lifting is almost the weight of the pump.
【図１】本発明の一実施例を示す断面図。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】揚液管及びサブマージドポンプを貯槽タンク内
に設置した状態を示す断面図。FIG. 2 is a cross-sectional view showing a state in which a pumping pipe and a submerged pump are installed in a storage tank.
１…貯槽タンク、２…揚液管、３…サブマージドポン
プ、５…ポンプ部、６…底板、７…モータ部、８…吐出
口、９…ポンプケーシング、１１…座面、１２…座面。DESCRIPTION OF SYMBOLS 1 ... Storage tank, 2 ... Pumping pipe, 3 ... Submerged pump, 5 ... Pump part, 6 ... Bottom plate, 7 ... Motor part, 8 ... Discharge port, 9 ... Pump casing, 11 ... Seating surface, 12 ... Seating surface .
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田島 大策 茨城県土浦市神立町603番地 株式会社日 立製作所土浦工場内 (72)発明者 仲平 四郎 茨城県土浦市神立町603番地 株式会社日 立製作所土浦工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Daisaku Tajima 603 Kitsudachi-cho, Tsuchiura-shi, Ibaraki Hitate Works Co., Ltd. Tsuchiura factory (72) Inventor Shiro Nakahira 603, Kintate-cho, Tsuchiura-shi, Ibaraki Hitate Co., Ltd. Tsuchiura factory
Claims (1)
し、ケーシング内部を取扱液が流過可能なモータ部とポ
ンプ部とで構成されるサブマージドポンプにおいて、ポ
ンプ吸込口に逆止弁を取り付けると共に、前記ケーシン
グ頂部にガス抜き弁を設けたことを特徴とするサブマー
ジドポンプ。1. A submerged pump which is seated down on a seating surface provided at the bottom of a pumping pipe and has a motor part and a pump part capable of allowing a handling liquid to flow through the inside of a casing. A submerged pump characterized in that a stop valve is attached and a gas vent valve is provided at the top of the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07836494A JP3363245B2 (en) | 1994-04-18 | 1994-04-18 | Submerged pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07836494A JP3363245B2 (en) | 1994-04-18 | 1994-04-18 | Submerged pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07286594A true JPH07286594A (en) | 1995-10-31 |
| JP3363245B2 JP3363245B2 (en) | 2003-01-08 |
Family
ID=13659955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07836494A Expired - Lifetime JP3363245B2 (en) | 1994-04-18 | 1994-04-18 | Submerged pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3363245B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005226750A (en) * | 2004-02-13 | 2005-08-25 | Iwatani Internatl Corp | Liquefied gas feeding apparatus and method of operating the same |
| JP2007064065A (en) * | 2005-08-30 | 2007-03-15 | Ebara Corp | Liquid feeding device and its operation method |
| CN106438391A (en) * | 2016-10-20 | 2017-02-22 | 孙洪建 | Submerged negative-pressure total head jet pump |
-
1994
- 1994-04-18 JP JP07836494A patent/JP3363245B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005226750A (en) * | 2004-02-13 | 2005-08-25 | Iwatani Internatl Corp | Liquefied gas feeding apparatus and method of operating the same |
| JP2007064065A (en) * | 2005-08-30 | 2007-03-15 | Ebara Corp | Liquid feeding device and its operation method |
| JP4660320B2 (en) * | 2005-08-30 | 2011-03-30 | 株式会社荏原製作所 | Liquid feeding device and operation method thereof |
| CN106438391A (en) * | 2016-10-20 | 2017-02-22 | 孙洪建 | Submerged negative-pressure total head jet pump |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3363245B2 (en) | 2003-01-08 |
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