JP4283549B2 - Inundation detection mechanism of vertical submersible electric pump - Google Patents
Inundation detection mechanism of vertical submersible electric pump Download PDFInfo
- Publication number
- JP4283549B2 JP4283549B2 JP2003008345A JP2003008345A JP4283549B2 JP 4283549 B2 JP4283549 B2 JP 4283549B2 JP 2003008345 A JP2003008345 A JP 2003008345A JP 2003008345 A JP2003008345 A JP 2003008345A JP 4283549 B2 JP4283549 B2 JP 4283549B2
- Authority
- JP
- Japan
- Prior art keywords
- chamber
- water
- inundation
- bearing housing
- pump
- 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.)
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- Structures Of Non-Positive Displacement Pumps (AREA)
Description
【0001】
【発明の技術分野】
本発明は、竪型水中電動ポンプの浸水検知機構に関するものである。
【0002】
【従来の技術】
周知のように小型の竪型水中電動ポンプでは、ポンプ室の圧力水がモータ室内へ浸水することのないように、ポンプ室とモータ室との間にメカニカルシールを内装させたオイル室が介装されている。しかしメカニカルシールの摺動部の摩耗や面荒れにより、該摺動部からオイル室に入った圧力水がモータ室内へ流入してモータに浸水漏電事故が発生することになる。
【0003】
このような浸水漏電事故を防止するためオイル室内に水位検知センサを設置して、オイル室内へ浸水した水の検知でモータへの通電を遮断するという技術的思想は既に公知である(例えば、特許文献1参照)。また、ポンプ室の圧力水をオイル室内へ浸水させないようにオイル室とモータ室との間に浸水溜り室を介装させ、該浸水溜り室内での浸水検知センサによる浸水検知信号でモータへの通電を遮断するよう構成したものも公知である(例えば、特許文献2参照)。
【0004】
【特許文献1】
特開2002−310091号公報 (第1図)
【特許文献2】
特開2000−303988号公報 (第1−2図)
【0005】
【発明が解決しょうとする課題】
浸水検知センサとしては一般に電極式またはフロート式のものが用いられている。電極式の場合にはポンプの吸排対象となる液体が導電性の良好なものに限定されるが、フロート式の場合にはそのような制約はないという利点がある。
【0006】
しかし特許文献1のようにポンプの全長を極力低くすることが要求され、浸水検知センサの取付スペースにも制約を受ける小型ポンプでは、上下に動作し且つ取付スペースを必要とするフロート式の浸水検知センサを、オイル室内に設置することは困難で、電極式のものを採用せざるを得ないのが実情である。また、オイル室内に水の入ること自体が好ましいことではない。
【0007】
一方、特許文献2のようにオイル室の上方に浸水溜り室を設けてその内部へフロート式の浸水検知センサを設置した機構では、ポンプの全高が著しく高くなるので小型ポンプには到底適用できない。そして特許文献1および特許文献2の構成に共通する欠点として、浸水検知センサの故障等による取替え時にはポンプケーシングやオイルケーシング等を取外すという大掛りな作業が必要で、メンテナンス性に問題があるということである。
【0008】
本発明の目的は、上述の課題を解決して、ポンプの全高を高くすることなく内容量の大きな浸水溜り室を構成することができ、電極式のものよりも取付スペースを要するフロート式の浸水検知センサでも上記浸水溜り室内へ容易に装着することができ、また、浸水検知センサの故障等による取替え時にもポンプケーシングやオイルケーシング等を取外すことを要せず、該封水カバーを取外すのみで実施でき、メンテナンス性にも優れた竪型水中電動ポンプの浸水検知機構を提供することにある。
【0009】
【問題を解決するための手段】
本発明に係る竪型水中電動ポンプの浸水検知機構では、メカニカルシールを内装させたベアリングハウジング内のオイル室がポンプ室とモータ室との間に介装されている竪型水中電動ポンプにおいて、オイル室の外側であるベアリングハウジング外周壁面に水密構造の浸水溜り室を付設し、該浸水溜り室内部のベアリングハウジング外周壁面に浸水検知センサを装着し、該浸水検知センサは該浸水溜り室の内容量を大とするカップ状の封水カバーで囲われて水密構造とされ、該浸水溜り室内の上方部とモータ室内とを導通させ、オイル室内のメカニカルシール装着位置よりも上方における回転軸の外周からベアリングハウジングを介して上記浸水溜り室へ導通させる通水路を開設し、浸水溜り室内への浸水による浸水検知信号を受けてモータへの通電が遮断されるよう電気的に接続した竪型水中電動ポンプの浸水検知機構を提供する。
【0010】
【実施例】
以下本発明の実施例を図面と共に説明をする。
【0011】
図1に示すように、1はポンプ室2とモータ室3との間に介装されたベアリングハウジング7内のオイル室、4はモータ室3内からオイル室1内を貫通してポンプ室2内へ導下された回転軸、5はポンプ室2内において回転軸4に嵌着された羽根車、6はオイル室1内において回転軸4に装着されたメカニカルシールを示す。7は回転軸4を支承するベアリングハウジング、8はオイル室1の外側であるベアリングハウジング7外周壁面に付設される浸水溜り室であり、カップ状の浸水溜り室8の内容量を大とする封水カバー9で囲われて水密構造となり、上記浸水溜り室8内部のベアリングハウジング7外周壁面には浸水検知センサ10が装着されている。
【0012】
11は封水カバー9に付設されたドレンプラグ、12は浸水溜り室8内の上方部とモータ室3内とを導通させる通路、13は回転軸4の外周から浸水溜り室8内へ至る通水路であり、オイル室1内のメカニカルシール6の装着位置よりも上方における回転軸4の外周からベアリングハウジング7を介して、上記通路12の開設位置よりも低位置へ導通するよう開設されている。そして通水路13を通って浸水溜り室8内へ浸水すれば、浸水検知センサ10による浸水検知信号を受けてモータへの通電が遮断され、また、警報を発するよう電気的に接続しておくものとする。
【0013】
【発明の効果】
本発明によれば、浸水検知センサ10を装着する浸水溜り室8がオイル室1の外側であるベアリングハウジング7外周壁面に付設されるため、ポンプの全高を高くすることなく、内容量の大きな浸水溜り室8を構成することができ、電極式のものよりも取付スペースを要するフロート式の浸水検知センサでも上記浸水溜り室8内へ余裕をもって装着することができ、ポンプを導電性の低い液体の吸排に供した場合でも有効に機能し、且つ封水カバー9が浸水検知センサ10の保護カバーの役割をも兼ねることになる。
【0014】
更に、浸水溜り室8内の内容量が大きいため、仮に該浸水溜り室8内へ浸水した場合でも浸水検知センサ10の作動タイムラグが長く確保できるため、警報発信による頻繁なる対応の作業は不要である。
【0015】
また、浸水検知センサ10の故障等による取替え時には該封水カバー9を取外すのみで浸水検知センサ10が完全に露出状態で付設されているため、浸水検知センサ10の検出位置調整や動作確認等の取替え作業が極めて容易であり、従来のような大掛りな分解作業を必要とせずメンテナンス性にも優れている。
【図面の簡単な説明】
【図1】 本発明浸水検知機構を装備した竪型水中電動ポンプの要部縦断側面図である。
【符号の説明】
1 オイル室
2 ポンプ室
3 モータ室
4 回転軸
6 メカニカルシール
7 ベアリングハウジング
8 浸水溜り室
10 浸水検知センサ
12 通路
13 通水路[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flood detection mechanism for a vertical submersible electric pump.
[0002]
[Prior art]
As is well known, in a small vertical submersible electric pump, an oil chamber with a mechanical seal is interposed between the pump chamber and the motor chamber so that the pressure water in the pump chamber does not enter the motor chamber. Has been. However, due to wear or surface roughness of the sliding portion of the mechanical seal, the pressure water that has entered the oil chamber from the sliding portion flows into the motor chamber, causing a water leakage accident in the motor.
[0003]
In order to prevent such a water leakage accident, the technical idea of installing a water level detection sensor in the oil chamber and shutting off the power to the motor by detecting the water immersed in the oil chamber is already known (for example, patent Reference 1). In addition, a water storage chamber is interposed between the oil chamber and the motor chamber so that the pressure water in the pump chamber does not enter the oil chamber, and the motor is energized by a water detection signal from the water detection sensor in the water storage chamber. Those configured to shut off are also known (see, for example, Patent Document 2).
[0004]
[Patent Document 1]
JP 2002-310091 A (FIG. 1)
[Patent Document 2]
JP 2000-303988 A (Fig. 1-2)
[0005]
[Problems to be solved by the invention]
As an inundation detection sensor, an electrode type or a float type sensor is generally used. In the case of the electrode type, the liquid to be sucked and discharged by the pump is limited to one having good conductivity, but in the case of the float type, there is an advantage that there is no such restriction.
[0006]
However, as in Patent Document 1, it is required to reduce the overall length of the pump as much as possible, and in a small pump that is also restricted by the installation space of the inundation detection sensor, the float type inundation detection that operates up and down and requires an installation space In fact, it is difficult to install the sensor in the oil chamber, and it is necessary to use an electrode type sensor. Moreover, it is not preferable that water enters the oil chamber itself.
[0007]
On the other hand, in a mechanism in which a water storage chamber is provided above the oil chamber and a float type water detection sensor is installed inside the oil chamber as in Patent Document 2, the total height of the pump is remarkably high, so that it cannot be applied to a small pump. As a drawback common to the configurations of Patent Document 1 and Patent Document 2, a large work of removing a pump casing, an oil casing, and the like is necessary when replacing the water detection sensor due to a failure or the like, and there is a problem in maintainability. It is.
[0008]
The object of the present invention is to solve the above-mentioned problems, and to form a submerged pool chamber with a large internal capacity without increasing the overall height of the pump, and to provide a float-type submersible that requires more installation space than an electrode-type one. can also be easily attached to the flooded reservoir chamber by the detection sensor, also without requiring to remove the failure such as a pump casing, oil casing like even during replacement by the detecting water sensor, only remove the encapsulating water cover It is an object of the present invention to provide an inundation detection mechanism for a vertical submersible electric pump that can be implemented and has excellent maintainability.
[000 9 ]
[Means for solving problems]
In the inundation detection mechanism of the vertical submersible electric pump according to the present invention, in the vertical submersible electric pump in which the oil chamber in the bearing housing with a mechanical seal is interposed between the pump chamber and the motor chamber, A watertight water-spilling chamber is attached to the outer peripheral wall surface of the bearing housing, which is outside the chamber, and a water immersion detection sensor is mounted on the outer wall surface of the bearing housing inside the water storage chamber, and the water immersion detection sensor has an internal capacity of the water storage chamber. And a watertight structure surrounded by a cup-shaped sealing cover with a large diameter. The upper part of the submerged reservoir chamber and the motor chamber are connected to each other, and the outer periphery of the rotating shaft above the mechanical seal mounting position in the oil chamber. A water passage is established to conduct from the bearing housing through the bearing housing to the inundation reservoir chamber, and the motor receives the inundation detection signal due to inundation into the inundation reservoir chamber. Energization to provide the flooding detection mechanism of the vertical water electric pump which is electrically connected to be cut off.
[00 10 ]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
As shown in FIG. 1, reference numeral 1 denotes an oil chamber in a
[0012]
11 drain plug that is attached to the
[00 13 ]
【The invention's effect】
According to the present invention, the
[0014]
Furthermore, since the internal capacity of the
[0015]
Further, when the
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of an essential part of a vertical submersible electric pump equipped with a water immersion detection mechanism of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Oil chamber 2
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2003008345A JP4283549B2 (en) | 2003-01-16 | 2003-01-16 | Inundation detection mechanism of vertical submersible electric pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2003008345A JP4283549B2 (en) | 2003-01-16 | 2003-01-16 | Inundation detection mechanism of vertical submersible electric pump |
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JP2004218576A JP2004218576A (en) | 2004-08-05 |
JP4283549B2 true JP4283549B2 (en) | 2009-06-24 |
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JP2003008345A Expired - Lifetime JP4283549B2 (en) | 2003-01-16 | 2003-01-16 | Inundation detection mechanism of vertical submersible electric pump |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013030481A1 (en) | 2011-08-26 | 2013-03-07 | Arkema France | Process for the synthesis of c11 and c12 omega-aminoalkanoic acid esters comprising a nitrilaton step |
WO2014128154A1 (en) | 2013-02-20 | 2014-08-28 | Arkema France | Gas-phase and liquid-gas-phase nitrilation process |
DE102020106737B4 (en) | 2019-03-22 | 2024-04-04 | Okuma Corporation | SYSTEM FOR DETECTING MOISTURE INFECTION AND METHOD FOR DETECTING MOISTURE INFECTION |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6671983B2 (en) * | 2016-01-27 | 2020-03-25 | 株式会社川本製作所 | Casing cover and pump device |
JP7263199B2 (en) * | 2019-10-02 | 2023-04-24 | 株式会社荏原製作所 | Intermediate casing and submersible pump provided with same |
CN112431770A (en) * | 2020-10-23 | 2021-03-02 | 湖南耐普泵业股份有限公司 | Permanent magnetism immersed pump convenient to detect leaks |
-
2003
- 2003-01-16 JP JP2003008345A patent/JP4283549B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013030481A1 (en) | 2011-08-26 | 2013-03-07 | Arkema France | Process for the synthesis of c11 and c12 omega-aminoalkanoic acid esters comprising a nitrilaton step |
WO2014128154A1 (en) | 2013-02-20 | 2014-08-28 | Arkema France | Gas-phase and liquid-gas-phase nitrilation process |
DE102020106737B4 (en) | 2019-03-22 | 2024-04-04 | Okuma Corporation | SYSTEM FOR DETECTING MOISTURE INFECTION AND METHOD FOR DETECTING MOISTURE INFECTION |
US12005569B2 (en) | 2019-03-22 | 2024-06-11 | Okuma Corporation | Moisture intrusion detection system and moisture intrusion detection method |
Also Published As
Publication number | Publication date |
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JP2004218576A (en) | 2004-08-05 |
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