JP2001073985A - Piping direction adjusting device for water feeding pump unit - Google Patents
Piping direction adjusting device for water feeding pump unitInfo
- Publication number
- JP2001073985A JP2001073985A JP24837499A JP24837499A JP2001073985A JP 2001073985 A JP2001073985 A JP 2001073985A JP 24837499 A JP24837499 A JP 24837499A JP 24837499 A JP24837499 A JP 24837499A JP 2001073985 A JP2001073985 A JP 2001073985A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- water supply
- feeding pump
- water
- water feeding
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、給水ポンプユニ
ットにおける配管取付方向調整装置に関し、特に、屋内
等に設置する給水ポンプユニットと給水・送水配管との
取付装置の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe mounting direction adjusting device for a water supply pump unit, and more particularly to an improvement in a device for mounting a water supply pump unit and a water supply / water supply pipe installed indoors or the like.
【０００２】[0002]
【従来の技術】従来、高層建築やアパートに設置する給
水設備は、屋上に高架水槽を設け、水源から給水ポンプ
等で屋上の水槽に揚水し、この高架水槽から各階ごとに
給水を行うようにしていた。そして、近年では、高架水
槽にゴミの混入や、大腸菌の発生等が問題となり、屋上
の高架水槽を廃止し、高揚程の給水ポンプを用いて直接
各階に給水するようにしている（例えば、特開平８−２
６１１９１号、第４図）。そして、上記の給水設備は、
ほこりや湿気がなく、温度差の少ない場所での設置が必
要であり、しかも、水源から近く、吸込み高さを低くし
ている。また、給水ポンプは配管を短くするために建屋
の一階か、地下室の片隅に設置されている。2. Description of the Related Art Conventionally, a water supply system installed in a high-rise building or an apartment is provided with an elevated water tank on the roof, pumping water from a water source to the roof tank using a water supply pump or the like, and supplying water from the elevated water tank to each floor. I was In recent years, there has been a problem of contamination of the elevated water tank with garbage and generation of E. coli, etc., and the rooftop elevated water tank has been abolished, and water has been directly supplied to each floor using a high-lift water pump (for example, Kaihei 8-2
No. 61191, FIG. 4). And the above water supply equipment,
It needs to be installed in a place that is free from dust and moisture and has a small temperature difference, and is close to the water source and has a low suction height. The water supply pump is installed on the first floor of the building or in one corner of the basement to shorten the piping.
【０００３】[0003]
【発明が解決しょうとする課題】しかしながら、上記従
来の給水ポンプユニット給水配管取付方向は、図３また
は図４に示すように、２方向に限定されており、現地吸
込み配管との取り合いに融通性が低かった。そして、水
源からの吸込管を短くするためにポンプの吸込管を水源
側に設置すると、ポンプの吐出管と各階への送水管との
方向が異なるため、狭い場所での直角又は鋭角に曲げた
連結管が必要となり、管内の配管抵抗が増加し、高所へ
の送水が困難となっていた。また、吐出側の配管抵抗を
軽減するために、吸込側に直角又は湾曲させた連結管を
用いると、配管抵抗によるキャビテーションや連結管の
角部に空気が溜まり、騒音の原因となり、しかも、給水
ポンプの吐出圧が下がり、やはり、高所への送水が困難
であった。この発明は、配管抵抗を少なくして高所への
送水を可能とした送水ポンプを提供することを目的とす
る。However, the mounting direction of the conventional water supply pump unit water supply pipe is limited to two directions as shown in FIG. 3 or FIG. 4, so that the connection with the on-site suction pipe is flexible. Was low. And when the suction pipe of the pump is installed on the water source side to shorten the suction pipe from the water source, the direction of the discharge pipe of the pump and the water pipe to each floor is different, so it was bent at a right angle or acute angle in a narrow place. A connecting pipe was required, increasing the pipe resistance in the pipe, making it difficult to send water to high places. Also, if a connecting pipe that is perpendicular or curved to the suction side is used to reduce the pipe resistance on the discharge side, cavitation due to the pipe resistance and air accumulates at the corners of the connecting pipe, causing noise, and water supply The discharge pressure of the pump dropped, and it was also difficult to send water to high places. SUMMARY OF THE INVENTION An object of the present invention is to provide a water supply pump capable of supplying water to a high place with a reduced pipe resistance.
【０００４】[0004]
【課題を解決するための手段】この発明の要旨とすると
ころは、一端に吸込管と他端に吐出管を連結した給水ポ
ンプと、吐出管の分岐管に連結した圧力タンクと、給水
ポンプの制御盤とを組込んだ給水ポンプユニットにおい
て、給水ポンプの吸込管に回転可能な管継手を連結した
もので、狭い場所での直角又は鋭角に曲げた連結管を不
用とした吸込管と送水管となるものである。また、吐出
管にも回転可能な管継手を連結しておけば、給水ポンプ
ユニットは屋内の片隅にあっても、制御盤が操作しやす
い方向に設置できるものである。SUMMARY OF THE INVENTION The gist of the present invention is to provide a water supply pump having one end connected to a suction pipe and the other end connected to a discharge pipe, a pressure tank connected to a branch pipe of the discharge pipe, and a water supply pump. In a water supply pump unit incorporating a control panel, a rotatable pipe joint is connected to a suction pipe of a water supply pump, and a suction pipe and a water supply pipe that do not require a connection pipe bent at a right angle or an acute angle in a narrow place. It is what becomes. In addition, if a rotatable pipe joint is connected to the discharge pipe, the water supply pump unit can be installed in a direction in which the control panel can be easily operated, even if it is located at one corner of the room.
【０００５】[0005]
【発明の実施の形態】この発明に係る給水ポンプユニッ
トの配管取付方向調整装置は、先ず、建屋の各階へ送水
するための送水管に、給水ポンプの吐出管を対設して給
水ポンプユニットを設置する。そして、給水ポンプの吸
込管に連結した管継手を水源側に回転させて給水管に接
続すれば、配管の鋭角な迂回が減少され、給水にともな
う配管抵抗が少なくなり、高揚程の送水が可能となるも
のである。そして、連結管が不用となり、水源からの配
管距離も短くなり、建屋の低い場所の片隅に給水ポンプ
ユニットを設置できるものである。また、吐出管にも回
転可能な管継手を連結しておけば、制御盤が操作しやす
い向きに給水ポンプユニットが設置できるものである。BEST MODE FOR CARRYING OUT THE INVENTION A pipe feed direction adjusting device for a water supply pump unit according to the present invention comprises a water supply pipe for supplying water to each floor of a building, and a discharge pipe of the water supply pump opposed to the water supply pipe. Install. If the pipe joint connected to the suction pipe of the water supply pump is rotated to the water source side and connected to the water supply pipe, the sharp detour of the pipe is reduced, the pipe resistance associated with the water supply is reduced, and high head water supply is possible. It is what becomes. And a connecting pipe becomes unnecessary, the piping distance from a water source becomes short, and a water supply pump unit can be installed in one corner of a low place of a building. If a rotatable pipe joint is connected to the discharge pipe, the water supply pump unit can be installed in a direction in which the control panel can be easily operated.
【０００６】[0006]
【実施例】この発明を実施例に基づき詳述すると、ま
ず、図１において、符号１はキャビネットであって、キ
ャビネット１の内部には給水ポンプ２が配設してあり、
この発明の実施例では２台の給水ポンプ２、２が配設し
てある。給水ポンプ２の吸込側の吸込管３には回転可能
な管継手４が連結してあり、３６０度回転できるように
してある。そして、外部の給水管５の開口位置に吸込管
３に連結した管継手４を回動させて吸込管３を給水管５
に接続して、公共施設の水源と給水ポンプ２を接続して
ある。給水ポンプ２の吐出側には吐出管６が連結してあ
り、吐出管６の終端には回転可能な管継手７が連結して
あり、３６０度回転できるようにしてある。この管継手
７を回動させてキャビネット１の外部の送水管８に接続
して、給水ポンプ２の吐出管６を送水管８に連結し、高
層ビル等に給水できるようにしてある。なお、給水ポン
プ２と吸込管３の間に仕切弁９と、給水ポンプ２と吐出
管６の間に逆流防止用の逆止弁１０が設けてある。吐出
管６には給水点における圧力変動を少なくするために吐
出管６から分岐させて圧力タンク１１が設けてある。符
号１２は吐出管６と圧力タンク１１の間に設けた仕切
弁、符号１３は吸込管と吐出管の間のバイパス管に設け
た逆止弁であって、給水ポンプ２の休止時に、吐出管６
の水圧が低下した時に、公共施設の給水管５から吐出管
６に直接送水できるようにしてある。符号１４は給水ポ
ンプ２の駆動用の電動機、符号１５は給水ポンプユニッ
トの制御盤である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to an embodiment. First, in FIG. 1, reference numeral 1 denotes a cabinet, and a water supply pump 2 is disposed inside the cabinet 1.
In the embodiment of the present invention, two water supply pumps 2, 2 are provided. A rotatable pipe joint 4 is connected to the suction pipe 3 on the suction side of the water supply pump 2 so as to be able to rotate 360 degrees. Then, the pipe joint 4 connected to the suction pipe 3 is rotated to the opening position of the external water supply pipe 5 to move the suction pipe 3 to the water supply pipe 5.
And the water source of the public facility and the water supply pump 2 are connected. A discharge pipe 6 is connected to the discharge side of the water supply pump 2, and a rotatable pipe joint 7 is connected to the end of the discharge pipe 6 so as to be able to rotate 360 degrees. The pipe joint 7 is rotated to connect to a water supply pipe 8 outside the cabinet 1, and the discharge pipe 6 of the water supply pump 2 is connected to the water supply pipe 8 so that water can be supplied to a high-rise building or the like. A gate valve 9 is provided between the water supply pump 2 and the suction pipe 3, and a check valve 10 for preventing backflow is provided between the water supply pump 2 and the discharge pipe 6. The discharge pipe 6 is provided with a pressure tank 11 branched from the discharge pipe 6 in order to reduce pressure fluctuation at a water supply point. Reference numeral 12 denotes a gate valve provided between the discharge pipe 6 and the pressure tank 11, and reference numeral 13 denotes a check valve provided in a bypass pipe between the suction pipe and the discharge pipe. 6
When the water pressure drops, the water can be directly sent from the water supply pipe 5 of the public facility to the discharge pipe 6. Reference numeral 14 denotes an electric motor for driving the water supply pump 2, and reference numeral 15 denotes a control panel of the water supply pump unit.
【０００７】次に、回転可能な管継手４、７について、
図２に基づき詳述すると、管継手４は吸込管３または吐
出管６に連結するソケット４ａ、７ａの下端の内周面
に、給水管５または送水管８に連結するＬ字状のソケッ
ト４ａ、７ａの上端が挿入され、その間にシール用のＯ
リング４ｃ、７ｃと抜け止め用の複数のボール４ｄ、７
ｄが挟持されている。この複数のボール４ｄ、７ｄはソ
ケット４ａ、７ａとプラグ４ｂ、７ｂの間を転動して、
プラグ４ｂ、７ｂを３６０度回転できるようにしてあ
る。そして、ソケット４ａ、７ａの下端外周部にスリー
ブ４ｅ、７ｅが外挿され、スリーブ４ｅ、７ｅがソケッ
ト４ａ、７ａから抜け出さないようにストップリング４
ｆ、７ｆがソケット４ａ、７ａの下端外周部に嵌着して
ある。ソケット４ａ、７ａとスリーブ４ｅ、７ｅの間に
スプリング４ｇ、７ｇが挿入されスリーブ４ｅ、７ｅが
ボール４ｄ、７ｄを押付けてソケット４ａ、７ａからプ
ラグ４ｂ、７ｂが抜け出さないようにしてある。なお、
スリーブ４ｅ、７ｅをスプリング４ｇ、７ｇを圧縮する
方向にスリーブ４ｅ、７ｅを移動させて、プラグ４ｂ、
７ｂを引き下げれば、ボール４ｄ、７ｄが浮き上がりプ
ラグ４ｂ、７ｂを引き抜けるようになっている。Next, regarding the rotatable pipe joints 4 and 7,
Referring to FIG. 2 in detail, the pipe joint 4 has an L-shaped socket 4a connected to the water supply pipe 5 or the water supply pipe 8 on the inner peripheral surface of the lower end of the socket 4a, 7a connected to the suction pipe 3 or the discharge pipe 6. , 7a are inserted, during which O for sealing is inserted.
Rings 4c, 7c and a plurality of balls 4d, 7 for retaining
d is clamped. These balls 4d, 7d roll between sockets 4a, 7a and plugs 4b, 7b,
The plugs 4b and 7b can be rotated 360 degrees. The sleeves 4e, 7e are extrapolated to the outer peripheral portions of the lower ends of the sockets 4a, 7a, and the stop rings 4 are provided so that the sleeves 4e, 7e do not come out of the sockets 4a, 7a.
f, 7f are fitted to the outer periphery of the lower ends of the sockets 4a, 7a. Springs 4g, 7g are inserted between the sockets 4a, 7a and the sleeves 4e, 7e, and the sleeves 4e, 7e press the balls 4d, 7d so that the plugs 4b, 7b do not come out of the sockets 4a, 7a. In addition,
By moving the sleeves 4e, 7e in the direction of compressing the springs 4g, 7g, the plugs 4b,
When 7b is lowered, the balls 4d, 7d are lifted up and pulled out of the plugs 4b, 7b.
【０００８】そして、この管継手４、７を用いて給水ポ
ンプユニットを設置するには、先ず、管継手４のソケッ
ト４ａの上端部にシールパッキンを挟持させて吸込管３
にソケット４ａをボルト等で連結し、プラグ４ｂのＬ字
状の下端を吸込管３の開口端に回動させて微調整を行え
ば、給水管５を吸込管３に簡単に接続することができ
る。そして、吐出管６と送水管８の間に連結する管継手
７も、管継手７のソケット７ａの上端部にシールパッキ
ンを挟持させて吐出管６にボルト等で連結し、プラグ７
ｂのＬ字状の下端を送水管８に回動させて微調整を行え
ば、制御盤１５が操作しやすい向きに給水ポンプユニッ
トが設置でき、図１に示すように、給水管５と送水管８
の配管が反対側にあっても、あるいは同方向にあっても
容易に接続が可能となるものである。なお、管継手４は
給水ポンプの吸込管３側だけに設けたものにあっては、
給水ポンプ2の吐出管６を送水管８に接続しやすい位置
に給水ポンプユニットを配設し、吸込管３に連結した管
継手４のプラグ７ｂの下端を送水管８に回動させれば、
屈曲した連結管が不要となり、吸込管を短くすることが
できるものである。In order to install a water supply pump unit using the pipe joints 4 and 7, first, a seal packing is sandwiched between upper ends of the sockets 4a of the pipe joints 4 so that the suction pipe 3 is provided.
The water supply pipe 5 can be easily connected to the suction pipe 3 if the socket 4a is connected to the suction pipe 3 by a bolt or the like, and the L-shaped lower end of the plug 4b is rotated to the open end of the suction pipe 3 for fine adjustment. it can. The pipe joint 7 connected between the discharge pipe 6 and the water supply pipe 8 is also connected to the discharge pipe 6 with a bolt or the like by sandwiching a seal packing at the upper end of the socket 7a of the pipe joint 7, and the plug 7
If the L-shaped lower end of b is rotated to the water supply pipe 8 to perform fine adjustment, the water supply pump unit can be installed in a direction in which the control panel 15 can be easily operated, and as shown in FIG. Water pipe 8
Even if these pipes are on the opposite side or in the same direction, connection can be easily made. In the case where the pipe joint 4 is provided only on the suction pipe 3 side of the water supply pump,
If the water supply pump unit is disposed at a position where the discharge pipe 6 of the water supply pump 2 is easily connected to the water supply pipe 8, and the lower end of the plug 7 b of the pipe joint 4 connected to the suction pipe 3 is rotated to the water supply pipe 8,
The bent connecting pipe becomes unnecessary, and the suction pipe can be shortened.
【０００９】[0009]
【発明の効果】この発明に係る給水ポンプユニットの配
管取付方向調整装置は、回動可能な継手管を設けたので
連結管が不要となるものである。即ち、従来装置の給水
ポンプユニットの吸込管と吐出管に、水源からの給水管
と高所への送水管を接続するためには、狭い場所での直
角又は鋭角に曲げた連結管が必要となり、管内の配管抵
抗が増加し、高所への送水が困難となっていたものであ
るが、この発明にあっては、給水ポンプの吸込管に回転
可能な管継手を連結したもので、狭い場所での直角又は
鋭角に曲げた連結管を不用とした吸込管と送水管となる
ものである。また、吐出管にも回転可能な管継手を連結
しておけば、給水ポンプユニットは屋内の片隅にあって
も、制御盤が操作しやすい方向に設置できるものであっ
て、配管抵抗によるキャビテーションや連結管の角部に
空気が溜まることがなく、従って、騒音と給水ポンプの
吐出圧の低下が防止できるものである。According to the apparatus for adjusting the pipe mounting direction of the water supply pump unit according to the present invention, since a rotatable joint pipe is provided, a connecting pipe is not required. That is, in order to connect a water supply pipe from a water source and a water supply pipe to a high place to a suction pipe and a discharge pipe of a water supply pump unit of a conventional apparatus, a connecting pipe bent at a right angle or an acute angle in a narrow place is required. However, the pipe resistance in the pipe has increased, making it difficult to send water to high places.In this invention, a rotatable pipe joint is connected to the suction pipe of the water supply pump, It is a suction pipe and a water supply pipe that do not require a connecting pipe bent at a right angle or an acute angle at the place. Also, if a rotatable pipe joint is connected to the discharge pipe, the water supply pump unit can be installed in a direction easy to operate the control panel even in one corner of the room, and cavitation due to pipe resistance and The air does not accumulate at the corners of the connecting pipe, so that noise and a decrease in the discharge pressure of the water supply pump can be prevented.
【図１】この発明に係る給水ポンプユニットの配管取付
方向調整装置の一部縦断側面図である。FIG. 1 is a partial longitudinal side view of a pipe mounting direction adjusting device of a water supply pump unit according to the present invention.
【図２】この発明に係る配管取付方向調整装置の要部の
縦断側面図である。FIG. 2 is a longitudinal sectional side view of a main part of the pipe mounting direction adjusting device according to the present invention.
【図３】従来装置の給水ポンプユニットの給水管と送水
管への取付け方向を示す概念図である。FIG. 3 is a conceptual diagram showing a water supply pipe and a mounting direction of a water supply pump unit of a conventional apparatus to a water supply pipe.
【図４】従来装置の給水ポンプユニットの給水管と送水
管への他の取付け方向を示す概念図である。FIG. 4 is a conceptual diagram showing a water supply pipe and another mounting direction of the water supply pump unit of the conventional apparatus to the water supply pipe.
２ 給水ポンプ ３ 吸込管 ４ 管継手 ６ 吐出管 ７ 管継手 １１ 圧力タンク １５ 制御盤 2 Feed pump 3 Suction pipe 4 Fitting 6 Discharge pipe 7 Fitting 11 Pressure tank 15 Control panel
Claims (2)
（６）を連結した給水ポンプ（２）と、吐出管（６）の
分岐管に連結した圧力タンク（１１）と、給水ポンプ
（２）の制御盤（１５）とを組込んだ給水ポンプユニッ
トにおいて、給水ポンプ（２）の吸込管（３）に、回転
可能な管継手（４）を連結したことを特徴とする給水ポ
ンプユニットの配管取付方向調整装置。A water supply pump (2) having one end connected to a suction pipe (3) and the other end connected to a discharge pipe (6); a pressure tank (11) connected to a branch pipe of the discharge pipe (6); A water supply pump unit incorporating a control panel (15) of a pump (2), wherein a rotatable pipe joint (4) is connected to a suction pipe (3) of the water supply pump (2). Pump unit piping installation direction adjustment device.
に、回転可能な管継手（７）を連結したことを特徴とす
る請求項１記載の給水ポンプユニットの配管取付方向調
整装置。2. A discharge pipe (6) of the water supply pump (2).
2. A pipe mounting direction adjusting device for a water supply pump unit according to claim 1, wherein a rotatable pipe joint is connected to said pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24837499A JP2001073985A (en) | 1999-09-02 | 1999-09-02 | Piping direction adjusting device for water feeding pump unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24837499A JP2001073985A (en) | 1999-09-02 | 1999-09-02 | Piping direction adjusting device for water feeding pump unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001073985A true JP2001073985A (en) | 2001-03-21 |
Family
ID=17177160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24837499A Pending JP2001073985A (en) | 1999-09-02 | 1999-09-02 | Piping direction adjusting device for water feeding pump unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001073985A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360748A (en) * | 2020-10-30 | 2021-02-12 | 冯海迪 | Horizontal multi-stage water feed pump |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51117302A (en) * | 1975-04-09 | 1976-10-15 | Hitachi Ltd | Hot water circulating pump |
| JPS571985U (en) * | 1980-06-04 | 1982-01-07 | ||
| JPS59201996A (en) * | 1983-04-28 | 1984-11-15 | Hitachi Ltd | Pump system |
| JPH0614677U (en) * | 1992-07-22 | 1994-02-25 | 博章 田口 | Rotary joint with check valve |
| JPH0874793A (en) * | 1994-09-08 | 1996-03-19 | Sayama Seisakusho:Kk | Pumping device |
| JPH08312856A (en) * | 1995-05-22 | 1996-11-26 | Koumei Seisakusho:Kk | Pipe joint |
| JPH11210969A (en) * | 1998-01-26 | 1999-08-06 | Nok Corp | Ball lock type connector and piping connection method using this ball lock type connector |
-
1999
- 1999-09-02 JP JP24837499A patent/JP2001073985A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51117302A (en) * | 1975-04-09 | 1976-10-15 | Hitachi Ltd | Hot water circulating pump |
| JPS571985U (en) * | 1980-06-04 | 1982-01-07 | ||
| JPS59201996A (en) * | 1983-04-28 | 1984-11-15 | Hitachi Ltd | Pump system |
| JPH0614677U (en) * | 1992-07-22 | 1994-02-25 | 博章 田口 | Rotary joint with check valve |
| JPH0874793A (en) * | 1994-09-08 | 1996-03-19 | Sayama Seisakusho:Kk | Pumping device |
| JPH08312856A (en) * | 1995-05-22 | 1996-11-26 | Koumei Seisakusho:Kk | Pipe joint |
| JPH11210969A (en) * | 1998-01-26 | 1999-08-06 | Nok Corp | Ball lock type connector and piping connection method using this ball lock type connector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360748A (en) * | 2020-10-30 | 2021-02-12 | 冯海迪 | Horizontal multi-stage water feed pump |
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