JP3363245B2 - Submerged pump - Google Patents
Submerged pumpInfo
- Publication number
- JP3363245B2 JP3363245B2 JP07836494A JP7836494A JP3363245B2 JP 3363245 B2 JP3363245 B2 JP 3363245B2 JP 07836494 A JP07836494 A JP 07836494A JP 7836494 A JP7836494 A JP 7836494A JP 3363245 B2 JP3363245 B2 JP 3363245B2
- Authority
- JP
- Japan
- Prior art keywords
- pump
- liquid
- casing
- 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.)
- Expired - Lifetime
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
【発明の詳細な説明】
【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。
【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。
【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。
【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。
【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。
【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。
【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、本発明は揚液管底部に設けられた座面に垂下着座
し、ポンプケーシングとモータハウジングとからなるケ
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、前記モー
タハウジングの上部をポンプカバーで封鎖し、このポン
プカバーに上部軸受を支持する上部軸受ハウジングを設
け、ポンプ吸込口に運転停止時に閉塞する逆止弁を取り
付けると共に、前記ポンプカバー頂部にフロートにより
内部の液面を感知し液面が下がった時に弁体が開いて自
動的にガスのみを抜くガス抜き弁を設けたものである。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。
【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。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a submerged pump for liquefied gas, and more particularly, to a submerged pump which is suspended in a liquid pump inserted into a liquefied natural gas tank. Pump. [0002] In general, various submerged pumps are known as pumps used for discharging liquefied gas or the like in a storage tank. [0003] An example of this use will be described with reference to the overall conceptual diagram shown in FIG. The flammable liquefied gas is sucked up from the storage tank 1 by suspending it from the upper part of the storage tank 1 into a pumping pipe 2 inserted into the storage liquid by a wire 4 via a hoist and pumping. Submerged pump 3 seated on the bottom of pipe 2
It is performed by. An apparatus of this type is disclosed in Japanese Patent Application Laid-Open No. 1-177493. In order to improve the liquid feeding efficiency at the time of restarting after a temporary stop of the pump, the apparatus is lifted once through the liquid pumping pipe 2. A check valve is provided at the pump discharge port 8 so that the pumped liquid does not flow backward. Also, when lifting the pump 3 for inspection, an excessive lifting load is not required due to the pressure of the pumped liquid located above the pump 3. Thus, it has been discussed to provide a remotely controllable on-off valve at the top of the casing. When a check valve is provided at the discharge port 8 to suppress the backflow of the liquid pumping pipe 2 in the above-mentioned prior art, the pump 3 which is being started is temporarily stopped, and When the restart is assumed, the liquefied gas clogged in the casing is vaporized due to the residual heat of the motor unit 7 and is filled in the casing, and there is a problem that the pump unit 5 may not be able to raise the pressure. . An object of the present invention is to prevent the backflow of the handling liquid remaining above the pump 3 in the pumping pipe 2 so as to improve the liquid sending efficiency, and to use only the liquefied gas vaporized at the time of stoppage of the casing. An object of the present invention is to provide a submerged pump that can be discharged to the outside at any time and that can be repeatedly stopped and started in a short time, and does not require a crane having an excessive specification for lifting the pump 3 during inspection. SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a casing comprising a pump casing and a motor housing , which hangs down on a seating surface provided at the bottom of a pumping pipe. > pacing the interior pumped fluid in submerged pump composed of a flow-through possible motor unit and the pump unit, the motor
Seal the top of the housing with a pump cover and
The upper bearing housing that supports the upper bearing is
In addition, a check valve that closes when operation is stopped is attached to the pump suction port, and a float is
When the liquid level inside is sensed and the liquid level drops, the valve opens and
It is provided with a degassing valve for dynamically degassing only gas. According to the submerged pump of the present invention, when the submerged pump is started, the liquefied gas in the storage tank 1 is sucked from the pump suction port and then discharged from the discharge port 8 to the liquid pumping pipe. 2 and the liquid is sent to the outside of the tank.
In addition, when the operation of the pump is stopped, the pump is closed by a check valve provided at the pump suction port at the bottom of the pumping pipe 2.
The pumped liquid in the pumping pipe 2 including the inside of the liquid is kept stored. Therefore, when the pump is restarted after being temporarily stopped, it is not necessary to fill the pumping pipe 2 with the liquid to be handled, so that the liquid sending efficiency can be improved. Also, after temporarily stopping the pump 3,
When the liquefied gas in the casing is vaporized due to the residual heat of the motor unit 7, only the vaporized gas is discharged to the outside of the casing by a gas release valve provided at the top of the casing. It is possible to restart the vehicle immediately without waiting for the vehicle not to run idle. Further, since the check valve is provided at the pump suction port, the pressure in the casing is balanced with the pressure in the liquid pumping pipe.
When pulling up the pump, the force required for pulling up is almost only the weight of the pump 3 itself. An embodiment of a submerged pump according to the present invention will be described in detail with reference to FIG. FIG. 1 is a structural view showing a state in which a submerged pump 3 for supplying liquefied gas is seated on the bottom of a liquid pumping pipe 2 inserted into a storage tank 1. In FIG. 1, a submerged pump 3 is
It comprises a pump section 5 and a motor section 7 and is housed in a casing comprising a pump casing 9 and a motor housing 10, respectively. The submerged pump 3 is connected to the pumping pipe 2
The pump casing 9 is in contact with the seat surface 11 and the bottom plate 6 is in contact with the pump casing 9 on the seat surface 12. The pump section 5 comprises a plurality of impellers 13 and a pump casing 9 provided to form a flow path connecting the suction port 15 to the discharge port 8 through the impeller 13. A check valve 14 is provided at the inlet of a suction port 15 provided in the bottom plate 6 for guiding the liquid to be handled. 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. 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.
Is provided.
At the top of the pump cover 21 is mounted a gas release valve 23 that senses the internal liquid level by means of a float and opens the valve body when the liquid level drops to automatically release only gas. The submerged pump configured as described above operates as follows. 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, passes through the gap between the bottom plate 6 of the pumping pipe 2 and the pumping 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 is discharged from the discharge port 8.
The liquid is further discharged into the liquid pumping pipe 2. Fig. 2
The liquid is sent along the arrow shown in FIG. 2 and fills the inside of the liquid pumping pipe 2 and is then sent to the outside of the storage tank 1. When the pump 3 is stopped in order to interrupt the liquid feeding, the handled liquid filled in the liquid pumping pipe 2 is returned to the check valve 1.
4, are closed and stored by the seat surface 11, the seat surface 12, the inner edge of the pumping pipe 2, and the outer edge of the pump casing 9. At this time, when a part of the liquid in the motor unit and the pump unit is vaporized due to the residual heat of the motor whose operation has been stopped, the gas vent valve 23 provided on the top of the pump cover 21 is used.
Is discharged out of the casing. The load for lifting the submerged pump 3 for inspection or repair includes the submerged pump 3
And the pressure corresponding to the difference between the liquid head in the pumping pipe 2 and the liquid head in the storage tank 1, and the annular cross-sectional area determined from the difference in the radial dimension between the seating surface 11 and the seating surface 12. The load determined by the product of However, in this structure, the difference in the radial dimension between the seating surface 11 and the seating surface 12 can be suppressed to be small, so that an excessively large lifting machine is not required, which is economical. According to the submerged pump of the present invention,
When the operation of the pump is stopped, the pump is closed by a check valve provided at the pump suction port at the bottom of the pumping pipe, and when the pump is restarted, it is not necessary to fill the pumping pipe with the handling liquid, so that the liquid sending efficiency can be improved. Further, even if the liquefied gas in the casing is vaporized due to the residual heat of the motor after the pump is temporarily stopped, only the vaporized gas is discharged to the outside of the casing by a gas release valve provided at the top of the casing. , It can be restarted immediately. Further, since the check valve is provided at the pump suction port, the pressure in the casing is balanced with the pressure in the liquid pumping pipe. Therefore, when the pump is lifted by a hoist for repair or inspection of the pump, etc. However, the lifting force required is almost the same as the pump's own weight.
【図面の簡単な説明】
【図１】本発明の一実施例を示す断面図。
【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。
【符号の説明】
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。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing one embodiment of the present invention. 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. [Description of Signs] 1 ... storage tank, 2 ... pumping pipe, 3 ... submerged pump, 5 ... pump section, 6 ... bottom plate, 7 ... motor section, 8 ... discharge port, 9 ... pump casing, 11 ... seat surface , 12 ... Seat surface.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 林 洋二郎 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 (72)発明者 依田 裕明 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 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 (56)参考文献 実開 昭58−118291（ＪＰ，Ｕ) 実開 平４−1691（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F04D 13/08 F04D 7/02 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yojiro Hayashi 603, Kandamachi, Tsuchiura-shi, Ibaraki Pref. Hitachi, Ltd. Tsuchiura Plant (72) Inventor Hiroaki Yoda 603, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi, Ltd. Tsuchiura Plant (72) Inventor Daisaku Tajima 603, Kunitachicho, Tsuchiura-shi, Ibaraki Pref., Hitachi, Ltd. Tsuchiura Plant, Hitachi, Ltd. (72) Inventor Shiro Nakahira 603, Kunitachi-cho, Tsuchiura-shi, Ibaraki Pref., Hitachi, Ltd., Tsuchiura Plant (56) Reference Literature Japanese Utility Model 1983-118291 (JP, U) Japanese Utility Model Application Hei 4-1691 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F04D 13/08 F04D 7/02
Claims (1)
し、ポンプケーシングとモータハウジングとからなるケ
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、前記モー
タハウジングの上部をポンプカバーで封鎖し、このポン
プカバーに上部軸受を支持する上部軸受ハウジングを設
け、ポンプ吸込口に運転停止時に閉塞する逆止弁を取り
付けると共に、前記ポンプカバー頂部にフロートにより
内部の液面を感知し液面が下がった時に弁体が開いて自
動的にガスのみを抜く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。(57) [Claims 1] A liquid to be handled is passed down on a seating surface provided at the bottom of a liquid-lifting pipe, and flows through a casing formed of a pump casing and a motor housing. in submerged pump consists of a possible motor and the pump unit, the motor
Seal the top of the housing with a pump cover and
The upper bearing housing that supports the upper bearing is
In addition, a check valve that closes when operation is stopped is attached to the pump suction port, and a float is
When the liquid level inside is sensed and the liquid level drops, the valve opens and
A submerged pump characterized by having a gas release valve that dynamically releases only gas.
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 JPH07286594A (en) | 1995-10-31 |
| JP3363245B2 true 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) |
Families Citing this family (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 |
| JP4660320B2 (en) * | 2005-08-30 | 2011-03-30 | 株式会社荏原製作所 | Liquid feeding device and operation method thereof |
| CN106438391B (en) * | 2016-10-20 | 2019-01-01 | 孙洪建 | A kind of negative pressure total head injection immersible pump |
-
1994
- 1994-04-18 JP JP07836494A patent/JP3363245B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07286594A (en) | 1995-10-31 |
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