JP3947898B2 - Inverter-equipped dry submersible motor and submersible motor pump - Google Patents

Inverter-equipped dry submersible motor and submersible motor pump Download PDF

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Publication number
JP3947898B2
JP3947898B2 JP2000174716A JP2000174716A JP3947898B2 JP 3947898 B2 JP3947898 B2 JP 3947898B2 JP 2000174716 A JP2000174716 A JP 2000174716A JP 2000174716 A JP2000174716 A JP 2000174716A JP 3947898 B2 JP3947898 B2 JP 3947898B2
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Japan
Prior art keywords
head cover
submersible motor
main bracket
cooling water
inverter
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Expired - Fee Related
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JP2000174716A
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JP2001355591A5 (en
JP2001355591A (en
Inventor
幹生 岸森
昭 森
真二 五嶋
武志 岡山
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アイム電機工業株式会社
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Description

【０００１】
【発明の属する技術分野】
本発明は、水中に潜没させて使用するインバータ装備の乾式水中モータおよびインバータ装備の乾式水中モータを用いた水中モータポンプに関するものである。
【０００２】
【従来の技術】
従来、インバータ装備の乾式水中モータポンプとして特開平１０−９１８６号公報に開示されるように、水中モータを内蔵した水中モータポンプの反出力軸側のブラケットにヘッドカバーを取付け、このヘッドカバーによって形成される水密室内に制御回路部とインバータ回路部を内装して、インバータ回路部や制御回路部を別置きしたものの使い勝手の悪さを解消したものが提案されているが、水中モータの反負荷側の軸受はヘッドカバーによって本体の周囲にある冷水から遮断されているばかりでなく、ヘッドカバー内には自己発熱の大きい半導体パワー素子を用いたインバータ回路部が内装されているため、反負荷側の軸受による発熱及びインバータ回路部による発熱が軸受の寿命を短くすると共に駆動制御回路に悪影響を及ぼすという問題があった。
【０００３】
この問題は、水中モータポンプの吐出水の一部あるいは水道水を用いた冷却装置を付加すれば解消することが可能であることは容易に考えられることではあるが、構造が複雑になるばかなりでなく、躯体が大きくなるという難点がある。
【０００４】
【発明が解決しようとする課題】
そこで本発明は、乾式水中モータの反負荷側の軸受及び内装インバータ回路部が発生する熱を効率的に冷却除去して軸受の寿命を延ばすと共に、内装インバータ回路部の発生熱を冷却する構造とした構造が簡単で組立が容易な乾式水中モータおよび乾式水中モータポンプを提供しようとするものである。
【０００５】
【課題を解決するための手段】
本発明は上記の課題を解決するためになされたもので、第１の発明は、水中モータの反出力軸側に固定される軸受嵌着支持部を備えた主ブラケットに、適数の冷却水路形成用連結部を介してヘッドカバー取付用ブラケットを一体に設け、前記冷却水路形成用連結部によって、前記主ブラケットとヘッドカバー取付用ブラケット間に周囲の冷水を取り込むための冷却水路Ｓを形成すると共に、前記ヘッドカバー取付用ブラケットにはヘッドカバーを、また前記主ブラケットには水中モータのフレームをそれぞれボルトで固定し、前記ヘッドカバー内にはインバータ回路部または／および駆動制御回路部を内装し、かつ前記冷却水路形成用連結部の一部に、水中モータ側からヘッドカバー側へ貫通するリード線引出孔を設けたことを特徴とするインバータ装備の乾式水中モータである。
【０００６】
第２の発明は、蓋体を着脱自在に設けたヘッドカバー本体を主ブラケットに一体に設けると共に、前記ヘッドカバー本体内の主ブラケット上に、反出力軸と対応する周囲の冷水を取り込むための冷却水路Ｓを形成するトンネルを主ブラケット及びヘッドカバー本体と一体に設け、このトンネル上にインバータ回路部または/および駆動制御回路部を取付け、且つ前記主ブラケットに水中モータ側からヘッドカバー側へ貫通するリード線引出孔を設けたことを特徴とするインバータ装備の乾式水中モータである。
【０００７】
第３の発明は、水中モータの反出力軸側に固定される軸受嵌着支持部を備えた主ブラケットに、適数の冷却水路形成用連結部を介してヘッドカバー取付用ブラケットを一体に設け、前記冷却水路形成用連結部によって、前記主ブラケットとヘッドカバー取付用ブラケット間に周囲の冷水を取り込むための冷却水路Ｓを形成すると共に、前記ヘッドカバー取付用ブラケットにはヘッドカバーを、また前記主ブラケットには水中モータのフレームをそれぞれボルトで固定し、前記ヘッドカバー内にはインバータ回路部または／および駆動制御回路部を内装し、かつ前記冷却水路形成用連結部の一部に、水中モータ側からヘッドカバー側へ貫通するリード線引出孔を設けたことを特徴とするインバータ装備の乾式水中モータを用いた水中モータポンプである。
【０００８】
第４の発明は、蓋体を着脱自在に設けたヘッドカバー本体を主ブラケットに一体に設けると共に、前記ヘッドカバー本体内の主ブラケット上に、反出力軸と対応する周囲の冷水を取り込むための冷却水路Ｓを形成するトンネルを主ブラケット及びヘッドカバー本体と一体に設け、このトンネル上にインバータ回路部または/および駆動制御回路部を取付け、且つ前記主ブラケットに水中モータ側からヘッドカバー側へ貫通するリード線引出孔を設けたことを特徴とするインバータ装備の乾式水中モータを用いた水中モータポンプである。
【０００９】
【作用】
以上のような構成のインバータ装備の乾式水中モータ又はインバータ装置の乾式モータを用いた水中モータポンプを水中に潜没させて使用した場合、反出力軸側の軸受はヘッドカバーが無い場合と同様に外壁に接する水によって冷却されると共に、軸受及びインバータ回路部が発生する熱によって、主ブラケットとヘッドカバー取付用ブラケット間の加熱された水は、周囲の冷水と入れ替わって冷却流水を生じ、その冷却流水による冷却作用を行うことになる。また、インバータ回路部と制御回路部を収納したヘッドカバーの周囲も水と接触するようになるため、軸受と同様に発生熱による自然冷却水流によって冷却され、上記の問題が解消されることになる。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態について図面に基づき説明すれば次の通りである。
【００１１】
図１は本発明の実施例１の縦断面図、図２は図１のＡ−Ａ線断面図で、１は出力軸２側に羽根車（図示せず）を取り付けた水中モータ、３は水中モータ１の軸受嵌着支持部４を備え、周囲を６個のボルト５で水中モータのフレーム６の反出力軸側に固定した主ブラケットである。
【００１２】
そして、この主ブラケット３は、図２に示すように外側の左右に配したＴ字状の冷却水路形成用連結部７ａ，７ｂを介してヘッドカバー取付用ブラケット８と一体に構成して周囲の冷水を取り込むための冷却水路Ｓを形成し、また各冷却水路Ｓを形成する連結部７ａ，７ｂには主ブラケット３とヘッドカバー取付用ブラケット８をも貫通するリード線引出孔９ａ，９ｂが設けられている。
【００１３】
この実施例では冷却水路形成用連結部をＴ字状のものとしたが、柱状のものを適数設け、その一部にリード線引出孔を設けてもよい。
【００１４】
１０はヘッドカバー取付用ブラケット８に６本のボルト（図示せず）で固定したヘッドカバーで、インバータ回路部１１あるいはインバータ回路部１１と制御回路部を内装し、電源及び信号用ケーブル１２を介して外部制御装置に接続されている。
【００１５】
以上のように構成されているので、水中に潜没させて使用した場合、反出力軸側の軸受はヘッドカバーが無い場合と同様に主ブラケット３に接する水によって冷却されると共に、軸受及びインバータ回路部１１が発生する熱によって主ブラケット３とヘッドカバー取付用ブラケット８間の加熱された水は周囲の冷水との温度差によって、周囲の冷水と入れ替わって冷却流水を生じ、その結果、反出力軸側の軸受及びヘッドカバー１０内のインバータ回路部１１は冷却される。
【００１６】
従って、軸受の耐久性向上に効果があると共に、ヘッドカバー１０内に収納するインバータ回路等の電子回路の許容電流を大きくすることができると共に、電子回路の寿命を延す効果がある。また、組立は、一体に構成されている主ブラケット３とヘッドカバー取付用ブラケット８を介して水中モータ１のフレーム６にヘッドカバー１０をボルト止めすればよいので、組立が頗る簡単であると共に、外部に突出する余計な部分がないので、実用上非常に使い勝手が良いという実益があり、従来のインバータ装備の乾式水中モータおよび水中モータポンプの問題点を解消した構造として優れたものである。
【００１７】
図３は本発明の実施例２の縦断面図、図４は図３のＢ−Ｂ縦断面図で、この実施例は蓋体１０２を着脱自在に設けたヘッドカバー本体１０１を主ブラケット３１に一体に設けると共に、前記ヘッドカバー本体１０１内の主ブラケット３１上に反出力軸と対応する周囲の冷水を取り込むための冷却水路Ｓを形成するトンネル１０３を主ブラケット３１及びヘッドカバー本体１０１と一体に設け、このトンネル１０３上にインバータ回路部１１を固定するようにしたものである。なお９は水中モータとインバータ回路部１１を接続するリード線の引出孔である。
【００１８】
以上のように構成したので、実施例１と同様の効果を奏するばかりでなく、その組立は実施例１よりも遥かに容易なものを提供することが出来る。
【００１９】
【発明の効果】
本発明にかかるインバータ装備の乾式水中モータ又は本発明にかかるインバータ装備の乾式水中モータを用いた水中モータポンプにおける反負荷側の軸受及び内装インバータ回路が発生する熱を効率的に冷却除去し、軸受の寿命を延ばすと共に、発生熱によるインバータ回路部の劣化を防止する効果がある。また製作上構造及び組立が簡単かつ容易なものを提供し得る。
【図面の簡単な説明】
【図１】 本発明の実施例１の縦断面図。
【図２】 図１のＡ−Ａ線断面図。
【図３】 本発明の実施例２の縦断面図。
【図４】 図２のＢ−Ｂ線断面図。
【符号の説明】
１ 水中モータ
２ 出力軸
３ 主ブラケット
４ 軸受嵌着支持部
５ ボルト
６ フレーム
７ａ，７ｂ 冷却水路形成用連結部
８ ヘッドカバー取付用ブラケット
９ａ，９ｂ リード線引出孔
１０ ヘッドカバー
１１ インバータ回路部
１２ ケーブル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inverter-equipped dry submersible motor that is used while being submerged in water, and a submersible motor pump using the inverter-equipped dry submersible motor.
[0002]
[Prior art]
Conventionally, as disclosed in JP-A-10-9186 as a dry submersible motor pump equipped with an inverter, a head cover is attached to a bracket on the side opposite to the output shaft of a submersible motor pump incorporating a submersible motor, and is formed by this head cover. Although a control circuit unit and an inverter circuit unit are installed in a watertight chamber and the inverter circuit unit and the control circuit unit are separately installed, it has been proposed to eliminate the inconvenience, but the bearing on the anti-load side of the submersible motor is In addition to being shielded from the cold water around the main body by the head cover, the head cover is equipped with an inverter circuit section that uses a semiconductor power element that generates a large amount of heat. The heat generated by the circuit shortens the bearing life and adversely affects the drive control circuit. There was a problem.
[0003]
This problem can be easily solved by adding a cooling device using part of the submersible motor pump discharge water or tap water. In addition, there is a difficulty that the body becomes large.
[0004]
[Problems to be solved by the invention]
Accordingly, the present invention provides a structure that efficiently cools and removes heat generated by the bearing on the anti-load side of the dry submersible motor and the internal inverter circuit unit to extend the life of the bearing and cools the generated heat of the internal inverter circuit unit. It is an object of the present invention to provide a dry submersible motor and a dry submersible motor pump that are simple in structure and easy to assemble.
[0005]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problems. The first aspect of the present invention provides an appropriate number of cooling water channels in a main bracket having a bearing fitting support portion fixed to the counter-output shaft side of the submersible motor. A head cover mounting bracket is integrally provided via a formation connecting portion, and a cooling water passage S is formed between the main bracket and the head cover mounting bracket by the cooling water passage formation connecting portion to take in the surrounding cold water, A head cover is fixed to the head cover mounting bracket and a submersible motor frame is fixed to the main bracket with bolts, and an inverter circuit section and / or a drive control circuit section is installed in the head cover, and the cooling water channel A lead wire lead-out hole penetrating from the submersible motor side to the head cover side is provided in a part of the forming connecting portion. Which is a dry submersible motor of the converter equipment.
[0006]
According to a second aspect of the present invention, a head cover main body with a lid detachably provided is provided integrally with the main bracket, and a cooling water passage for taking in the surrounding cold water corresponding to the counter-output shaft onto the main bracket in the head cover main body. A tunnel forming S is provided integrally with the main bracket and the head cover body, and an inverter circuit section and / or a drive control circuit section is mounted on the tunnel, and lead wires are passed through the main bracket from the submersible motor side to the head cover side. It is a dry submersible motor equipped with an inverter characterized by providing a hole.
[0007]
According to a third aspect of the present invention, a head cover mounting bracket is integrally provided on a main bracket having a bearing fitting support portion fixed to the counter-output shaft side of the submersible motor via an appropriate number of cooling water channel forming connection portions. A cooling water passage S is formed between the main bracket and the head cover mounting bracket by the cooling water passage formation connecting portion, and a head cover is provided in the head cover mounting bracket and a head cover is provided in the main bracket. Each submersible motor frame is fixed with bolts, and an inverter circuit section and / or a drive control circuit section is provided in the head cover, and a part of the cooling water passage forming connection section is connected from the submersible motor side to the head cover side. Submersible motor pump using a dry submersible motor equipped with an inverter, characterized in that a lead wire lead-out hole is provided. It is.
[0008]
According to a fourth aspect of the present invention, a head cover main body with a lid detachably provided is provided integrally with the main bracket, and a cooling water passage for taking in the surrounding cold water corresponding to the counter-output shaft onto the main bracket in the head cover main body. A tunnel forming S is provided integrally with the main bracket and the head cover body, and an inverter circuit section and / or a drive control circuit section is mounted on the tunnel, and lead wires are passed through the main bracket from the submersible motor side to the head cover side. It is a submersible motor pump using a dry submersible motor equipped with an inverter, characterized in that a hole is provided.
[0009]
[Action]
When the submersible motor pump using the inverter-equipped dry submersible motor or inverter device dry motor is submerged in the water, the bearing on the non-output shaft side is the outer wall as in the case without the head cover. The water that is cooled by the water in contact with the heater and the heat generated by the bearing and the inverter circuit unit causes the heated water between the main bracket and the head cover mounting bracket to be replaced with the surrounding cold water to generate a cooling water flow. Cooling action will be performed. Further, since the periphery of the head cover that houses the inverter circuit portion and the control circuit portion also comes into contact with water, it is cooled by the natural cooling water flow caused by the generated heat in the same manner as the bearing, and the above problem is solved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
1 is a longitudinal sectional view of a first embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, 1 is a submersible motor with an impeller (not shown) attached to the output shaft 2 side, 3 The main bracket includes a bearing fitting support portion 4 of the submersible motor 1 and is fixed to the opposite output shaft side of the submersible motor frame 6 with six bolts 5.
[0012]
As shown in FIG. 2, the main bracket 3 is integrally formed with the head cover mounting bracket 8 via T-shaped cooling water channel forming connecting portions 7a and 7b arranged on the left and right sides of the outer side. The cooling water passages S for taking in water are formed, and the connecting portions 7a, 7b forming the respective cooling water passages S are provided with lead wire lead-out holes 9a, 9b penetrating the main bracket 3 and the head cover mounting bracket 8 as well. Yes.
[0013]
In this embodiment, the cooling water channel forming connecting portion is T-shaped, but an appropriate number of columnar members may be provided, and a lead wire extraction hole may be provided in a part thereof.
[0014]
A head cover 10 is fixed to the head cover mounting bracket 8 with six bolts (not shown). The head cover 10 includes an inverter circuit unit 11 or an inverter circuit unit 11 and a control circuit unit, and is externally connected via a power supply and signal cable 12. Connected to the control unit.
[0015]
Since it is configured as described above, when submerged in water, the bearing on the side opposite to the output shaft is cooled by water in contact with the main bracket 3 as in the case where there is no head cover, and the bearing and inverter circuit The water heated between the main bracket 3 and the head cover mounting bracket 8 due to the heat generated by the portion 11 is replaced with the surrounding cold water due to the temperature difference with the surrounding cold water to produce cooling flowing water. As a result, the counter-output shaft side The inverter circuit 11 in the bearing and the head cover 10 is cooled.
[0016]
Therefore, the durability of the bearing is improved, and the allowable current of an electronic circuit such as an inverter circuit housed in the head cover 10 can be increased, and the life of the electronic circuit can be extended. In addition, the assembly is simple because the head cover 10 can be bolted to the frame 6 of the submersible motor 1 via the main bracket 3 and the head cover mounting bracket 8 which are integrally formed. Since there is no extra portion that protrudes, there is a practical advantage that it is very convenient in practical use, and it is an excellent structure that eliminates the problems of conventional dry submersible motors and submersible motor pumps equipped with inverters.
[0017]
FIG. 3 is a longitudinal sectional view of the second embodiment of the present invention, and FIG. 4 is a longitudinal sectional view of FIG. 3 taken along BB. In this embodiment, a head cover main body 101 having a lid 102 detachably attached to the main bracket 31 is integrated. And a tunnel 103 is formed integrally with the main bracket 31 and the head cover body 101 to form a cooling water passage S for taking in the surrounding cold water corresponding to the counter-output shaft on the main bracket 31 in the head cover body 101. The inverter circuit unit 11 is fixed on the tunnel 103. Reference numeral 9 denotes a lead-out hole for connecting the submersible motor and the inverter circuit unit 11.
[0018]
With the configuration as described above, not only the same effects as those of the first embodiment can be obtained, but also an assembly that is much easier than that of the first embodiment can be provided.
[0019]
【The invention's effect】
In the submersible motor equipped with the inverter according to the present invention or in the submersible motor pump using the dry submersible motor equipped with the inverter according to the present invention, the heat generated by the bearing on the non-load side and the internal inverter circuit is efficiently cooled and removed. This is effective in extending the life of the inverter circuit and preventing deterioration of the inverter circuit section due to generated heat. In addition, it is possible to provide a structure that is simple and easy to construct and assemble.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of Embodiment 1 of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a longitudinal sectional view of Embodiment 2 of the present invention.
4 is a sectional view taken along line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Submersible motor 2 Output shaft 3 Main bracket 4 Bearing fitting support part 5 Bolt 6 Frame 7a, 7b Connection part for cooling water path formation 8 Head cover mounting bracket 9a, 9b Lead wire extraction hole 10 Head cover 11 Inverter circuit part 12 Cable

Claims (4)

水中モータの反出力軸側に固定される軸受嵌着支持部を備えた主ブラケットに、適数の冷却水路形成用連結部を介してヘッドカバー取付用ブラケットを一体に設け、前記冷却水路形成用連結部によって、前記主ブラケットとヘッドカバー取付用ブラケット間に周囲の冷水を取り込むための冷却水路Ｓを形成すると共に、前記ヘッドカバー取付用ブラケットにはヘッドカバーを、また前記主ブラケットには水中モータのフレームをそれぞれボルトで固定し、前記ヘッドカバー内にはインバータ回路部または／および駆動制御回路部を内装し、かつ前記冷却水路形成用連結部の一部に、水中モータ側からヘッドカバー側へ貫通するリード線引出孔を設けたことを特徴とするインバータ装備の乾式水中モータ。  A head cover mounting bracket is integrally provided on a main bracket having a bearing fitting support portion fixed to the counter-output shaft side of the submersible motor via an appropriate number of cooling water passage forming connecting portions, and the cooling water passage forming connection is provided. The cooling water passage S for taking in the surrounding cold water is formed between the main bracket and the head cover mounting bracket by the portion, the head cover mounting bracket is a head cover, and the main bracket is a submersible motor frame. A lead wire lead hole that is fixed with a bolt, has an inverter circuit part and / or a drive control circuit part in the head cover, and penetrates from the submersible motor side to the head cover side in a part of the cooling water channel forming connection part A dry submersible motor equipped with an inverter. 蓋体を着脱自在に設けたヘッドカバー本体を主ブラケットに一体に設けると共に、前記ヘッドカバー本体内の主ブラケット上に、反出力軸と対応する周囲の冷水を取り込むための冷却水路Ｓを形成するトンネルを主ブラケット及びヘッドカバー本体と一体に設け、このトンネル上にインバータ回路部または/および駆動制御回路部を取付け、且つ前記主ブラケットに水中モータ側からヘッドカバー側へ貫通するリード線引出孔を設けたことを特徴とするインバータ装備の乾式水中モータ。  A tunnel that forms a cooling water passage S for taking in the surrounding cold water corresponding to the counter-output shaft is provided on the main bracket in the head cover main body, and a head cover main body provided with a detachable lid is provided integrally with the main bracket. Provided integrally with the main bracket and the head cover body, the inverter circuit part or / and the drive control circuit part were mounted on this tunnel, and the lead wire lead-out hole penetrating from the submersible motor side to the head cover side was provided in the main bracket. A dry submersible motor equipped with an inverter. 水中モータの反出力軸側に固定される軸受嵌着支持部を備えた主ブラケットに、適数の冷却水路形成用連結部を介してヘッドカバー取付用ブラケットを一体に設け、前記冷却水路形成用連結部によって、前記主ブラケットとヘッドカバー取付用ブラケット間に周囲の冷水を取り込むための冷却水路Ｓを形成すると共に、前記ヘッドカバー取付用ブラケットにはヘッドカバーを、また前記主ブラケットには水中モータのフレームをそれぞれボルトで固定し、前記ヘッドカバー内にはインバータ回路部または／および駆動制御回路部を内装し、かつ前記冷却水路形成用連結部の一部に、水中モータ側からヘッドカバー側へ貫通するリード線引出孔を設けたことを特徴とするインバータ装備の乾式水中モータを用いた水中モータポンプ。  A head cover mounting bracket is integrally provided on a main bracket having a bearing fitting support portion fixed to the counter-output shaft side of the submersible motor via an appropriate number of cooling water passage forming connecting portions, and the cooling water passage forming connection is provided. The cooling water passage S for taking in the surrounding cold water is formed between the main bracket and the head cover mounting bracket by the portion, the head cover mounting bracket is a head cover, and the main bracket is a submersible motor frame. A lead wire lead hole that is fixed with a bolt, has an inverter circuit part and / or a drive control circuit part in the head cover, and penetrates from the submersible motor side to the head cover side in a part of the cooling water channel forming connection part A submersible motor pump using a dry submersible motor equipped with an inverter. 蓋体を着脱自在に設けたヘッドカバー本体を主ブラケットに一体に設けると共に、前記ヘッドカバー本体内の主ブラケット上に、反出力軸と対応する周囲の冷水を取り込むための冷却水路Ｓを形成するトンネルを主ブラケット及びヘッドカバー本体と一体に設け、このトンネル上にインバータ回路部または/および駆動制御回路部を取付け、且つ前記主ブラケットに水中モータ側からヘッドカバー側へ貫通するリード線引出孔を設けたことを特徴とするインバータ装備の乾式水中モータを用いた水中モータポンプ。  A tunnel that forms a cooling water passage S for taking in the surrounding cold water corresponding to the counter-output shaft is provided on the main bracket in the head cover main body, and a head cover main body provided with a detachable lid is provided integrally with the main bracket. Provided integrally with the main bracket and the head cover body, the inverter circuit part or / and the drive control circuit part were mounted on this tunnel, and the lead wire lead-out hole penetrating from the submersible motor side to the head cover side was provided in the main bracket. A submersible motor pump using a dry submersible motor equipped with an inverter.
JP2000174716A 2000-06-12 2000-06-12 Inverter-equipped dry submersible motor and submersible motor pump Expired - Fee Related JP3947898B2 (en)

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IT1391311B1 (en) * 2008-10-15 2011-12-01 Sumoto Srl POWER SUPPLY AND CONTROL UNIT, PARTICULARLY FOR SUBMERSIBLE MOTORS.
JP5515990B2 (en) 2010-04-06 2014-06-11 株式会社Ｉｈｉ Turbo compressor and turbo refrigerator
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CN106481571A (en) * 2016-12-06 2017-03-08 江苏斯别特制泵有限公司 A kind of power adjustable formula immersible pump
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Publication number Priority date Publication date Assignee Title
CN110836190A (en) * 2019-09-28 2020-02-25 金华市东大泵业有限公司 Internal mesh-shaped two-state heat-conducting permanent magnet shielding tube pump
CN110836190B (en) * 2019-09-28 2021-06-01 金华市东大泵业有限公司 Internal mesh-shaped two-state heat-conducting permanent magnet shielding tube pump

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