JP4595164B2 - Electric pump - Google Patents

Electric pump Download PDF

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Publication number
JP4595164B2
JP4595164B2 JP2000182636A JP2000182636A JP4595164B2 JP 4595164 B2 JP4595164 B2 JP 4595164B2 JP 2000182636 A JP2000182636 A JP 2000182636A JP 2000182636 A JP2000182636 A JP 2000182636A JP 4595164 B2 JP4595164 B2 JP 4595164B2
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JP
Japan
Prior art keywords
passage
impeller
suction
water
discharge
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Expired - Fee Related
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JP2000182636A
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Japanese (ja)
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JP2002005067A (en
Inventor
孝文 関
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Panasonic Electric Works Co Ltd
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Panasonic Corp
Matsushita Electric Works Ltd
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Priority to JP2000182636A priority Critical patent/JP4595164B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、たとえば水等の流体の循環管路に配設されて流体の強制循環等に用いる電気ポンプに関する。
【0002】
【従来の技術】
従来、この種の電気ポンプとしては、たとえば図4、図5に示すようなものが知られている。図4は従来の電気ポンプの縦断側面図、図5は同電気ポンプの縦断正面図である。
【0003】
電気ポンプは、図4に示すように駆動モータ部1とポンプ部5より構成されている。前記駆動モータ部1は、駆動モータ2と、この駆動モータ2が内装される前後一対のモータカバー3とを備えており、モータカバー3の前面側にブラケット4を介してポンプ部5のケーシング6が一体的に連設されている。前記駆動モータ2のシャフト7はブラケット4を貫通してポンプ部5のケーシング6内に突入させてあり、先端部には羽根車8がメカニカルシール9を挟み込んだ状態で一体に螺着して連結されている。
【0004】
また、前記ケーシング6は、その前面開口部が仕切板11で閉塞されており、また、この仕切板11を挟み、かつ、パッキン10を介してケーシングカバー12が配設されている。このケーシングカバー12には、吸込口13と吐出口14が形成されており、図5に示すように吸込口13をケーシング12の吸引通路15を介して羽根車8の吸込側に連通させるとともに、吐出口14を吐出通路16を有するケーシングカバー12内に開口させ、さらに、仕切板11に穿設した還流穴17を通じて羽根車8の吐出側に連通させてある。
【0005】
前記仕切板11における羽根車8の対応部には羽根車吸込み口21を形成してあり、ケーシングカバー12内における吸引通路15は、羽根車吸込み口21から放射状に一定断面で延びている。この吸引通路15と周囲の吐出通路16は分離板22によって区画されて形成されている。分離板22の上面は吸込口13の近傍まで延びて、ここで吐出口側に向けて屈曲されている。
【0006】
図6はこの種の電気ポンプが適用される還流配管系統の一例を示す概略配管図で、上記構成の電気ポンプを用いて図6に示すような還流配管18を通じて水槽19の水を吸引・吐出する場合について説明すると、前記還流配管18は、水槽19に繋がる水平管部とポンプPに繋がる垂直管部間に、互いに平行な3本の垂直管部およびこれら垂直管部を結ぶ上下3本の水平管部からなるクランク状の往復連通管部18a,18bにより構成されており、まず、ポンプ室内に導水した上で、駆動モータ2の電源を入れ、羽根車8を回転させて気水分離し、空気が水に先立って図5の矢印aで示すように、吐出口14から吐出側管路18aを通って水槽19に吐出させる。一方、水と微量の残存空気は図5の矢印bで示すように吐出通路16を通り仕切板11の還流穴17を通じ羽根車8へ還流され、また、水槽19内の水は吸込側管路18bを通ってポンプPの吸込口13へ導かれる。
【0007】
【発明が解決しようとする課題】
上記のように数箇所で屈曲している還流配管18においては、ポンプに自動吸引動作をおこなわせる場合、ポンプPの吸込口13へ到達して吐出口14から吐出される水が吐出側管路18aに流出する際に、同吐出側管路18aに押し込み圧が作用し、この圧力の反動がポンプ吐出口14に作用するため、気水分離された空気が吐出側管路18aに抜けることが不能となり、自動吸引動作ができなくなるため、吸込通路15と吐出通路16とを連通する還流通路を形成することにより、数箇所で屈曲している配管においても自動吸引可能な強制循環させるものがあった。しかしながら、上記還流通路を設けることにより、羽根車8に流入する循環水が飛散し、自動吸引効率が低いために、電気ポンプは大型化にならざるを得ず、コスト的にも高価なものになる。
【0008】
本発明は、上記のように数箇所で屈曲している配管においても、自動吸引可能な強制循環用の電気ポンプを大型化することなく安価で提供することを目的とする。
【0009】
【課題を解決するための手段】
本発明は前記目的を達成するため、ケーシングカバーの吸引通路と吐出通路とを連通する還流通路を、吸引通路を通って流入する正面位置に形成し、前記還流通路に対向してケーシングカバーに突出部を設けた構成の電気ポンプとする。
【0010】
本発明によれば、ケーシングカバーの吸引通路と吐出通路とを連通する還流通路が吸引通路を通って流入する流れの正面位置に形成されているため、配管が屈曲していてポンプ吐出側管路に押し込み圧が作用する状態であっても、吐出通路内の水をスムーズに循環させて吸込み側に戻すことにより押し込み圧の反動圧を緩和してポンプ吐出圧を徐々に高くすることができる。この際、還流通路を通って羽根車へ循環させる水が羽根車の回転によって、吸引通路に飛散するが、ケーシングカバーに設けた突出部によって、水の飛散が抑えられ、スムーズに羽根車へと循環させることができるし、通常運転に入ったときには、羽根車吸込み口から吸引される水の流れを乱すことが少なく、自吸時には空気流と対向して還流される水が噴射されて十分かきまぜられるという作用を有する。
【0011】
【発明の実施の形態】
本発明の請求項1に記載の発明は、羽根車が内装されるケーシングと、ケーシングの前面に仕切板およびパッキンを介して配設されるとともに、羽根車吸い込み口から延びた吸引通路が周囲の吐出通路と分離板によって区画されて形成されたケーシングカバーと、羽根車を駆動する駆動モータとを備え、分離板には吸引通路を通って流入する流れの正面位置に還流通路が形成され、還流通路に対向して前記羽根車吸い込み口より外周で前記ケーシングカバーの前記吸引通路内の上流に突出部を設け、前記突出部が前記吸引通路に飛散された前記還流通路からの循環水を前記羽根車吸い込み口に戻すものであることを特徴とする電気ポンプであり、自動吸引可能な強制循環用の電気ポンプを大型化することなく、安価で提供することができるという作用を有する。
【0012】
更に、吸引通路は、前記羽根車吸い込み口からラジアル方向に沿って放射状に一定断面で延びており、分離板は、その吐出口側の端部が吐出口側に屈曲されている構成としたことで、吸引通路内の流れを円滑な流れにすることができるとともに、同時に気水分離を行う吐出通路の部分を相対的に大きくすることができ、これにより押込み圧の反動圧を緩和することができ、ポンプをコンパクトにすることができるという作用を有する。
【0013】
以下、本発明の実施の形態について図面を参照して説明する。
【0014】
(実施の形態1)
図1は、本発明の実施の形態1の電気ポンプの縦断側面図、図2は、同電気ポンプの縦断正面図、図3は、同電気ポンプにおけるケーシングカバーの斜視図である。なお、この実施の形態1の電気ポンプの基本構成は、前述の従来例で示したものと同様であり、構成ならびに作用が共通する部分は共通の符号を付して、重複をさけるためにその説明を省略する。
【0015】
本発明の実施の形態1の電気ポンプは、ポンプ部5のケーシングカバー12内の構成に特徴を有している。すなわち、図1〜図3に示すようにポンプ部5のケーシングカバー12には、吸込通路15と吐出通路16とを連通する還流通路20を設けている。前記還流通路20は、羽根車吸込み口21の周囲を周回する分離板22の円弧状部分、すなわち吸引通路15を通って流入する流れの正面位置に形成され、そして、還流通路20に対向するようにケーシングカバー12に突出部23が設けられている。
【0016】
これによって、還流通路20を通って羽根車8へ循環させる水が、羽根車8の回転によって吸引通路15に飛散しても突出部23によって遮られ、羽根車8へとスムーズに導かれる。
【0017】
前記吸引通路15は放射状に一定断面で延びており、分離板22の吐出口14側の端部は、ケーシングカバー12の吸込口13の近傍で吐出口14側に向けて少し屈曲されている。
【0018】
これによって、ケーシング6内から吐出通路16内に吐出された水と空気がこの屈曲部分に沿って流れ、この際、求心力が作用して比重の軽い空気が効果的に気水分離できる。
【0019】
なお、気水分離後の水の流動によって吸引通路の周囲にいくつかの渦流れを生じるが、還流通路20が正面位置に設けてあるのでその影響をうけることが少なく、吐出通路16内を通過する水の循環をスムーズに行うことができ、還流される水を吸い込み側に戻して押し込み圧の反動圧を緩和し、ポンプの吐出圧を徐々に高くすることができる。
【0020】
また、ケーシングカバー12に設けられた突出部23は、吸込口13より流入される水の抵抗とならぬよう、吸込口13の断面積より小さくなるように設置することにより、本来機能である循環流量を損ねることはない。
【0021】
上記構成の電気ポンプを用いて図6に示すような屈曲した還流配管18を通じて水槽19の吸引、吐出する場合について説明する。
【0022】
まず、ポンプ室内に呼び水して導水した上で、駆動モータ2の電源を入れると、羽根車8が回転して気水分離され、空気が水に先立って図2の矢印aで示すように吐出口14から水槽19を経て大気へ放出される。一方、水と微量の残存空気は図2の矢印bで示すように吐出通路16を通り仕切板11の還流穴17を通じ羽根車8の吐出側へ還流されるとともに、一部は図2の矢印cで示すように還流通路20を通り羽根車8の吸込み側へ還流される。還流通路20を通って循環された水は、羽根車8へ流入するもの、羽根車8の回転によって吸引通路15に飛散される。これを図2の矢印dで示したが、ケーシングカバー12に設けられた突出部23により遮られ、効率良く羽根車8へと戻されて循環される。また、水槽19内の水は吸込み側18bを通ってポンプpの吸込口13へ導かれる。このとき羽根車吸込み口21付近では、空気流と対向して還流される水が空気中に噴射され、十分かき混ぜられ自吸作用が促進される。
【0023】
ポンプの吸込口13へ到達した水は、ポンプ内を通り吐出側管路18aに押し込み圧が作用する状態となる。この場合、ケーシングカバー12の吸引通路15と吐出通路16とを連通する還流通路20より羽根車8の吸込側へ水が還流され、ポンプ吐出圧が徐々に高くなり、吐出側管路18aに残存した水をスムーズに押し上げて、水の循環を無理なく行わせることができる。さらに通常運転に入ったときには、還流通路20が吸引通路15に通って流入する水の流れの正面位置に設けられているので、羽根車吸込み口21に吸引される水の流れが妨げられることが少なく、適度の予旋回が与えられるものとなる。
【0024】
なお、本実施の形態1では、ケーシングカバーに設けられた突出部は吸込み口に対して直角に設置しているが、吸引通路内で還流通路に対向するように設置すればよく、同様の作用と効果が得られる。
【0025】
【発明の効果】
以上の説明より明らかなように、本発明の電気ポンプは、ケーシングカバーの吸引通路と吐出通路とを連通する還流通路が吸引通路を通って流入する正面位置に形成され、還流通路に対向してケーシングカバーに設けられた突出部が、水の飛散を抑えるので、ポンプ配管が屈曲していてポンプ吐出側管路に押込み圧が作用する状態であっても、吐出通路内の水の循環をスムーズに行うことができ、これにより押込み圧の反動圧を緩和できるし、通常運転に入ったときには、羽根車吸込み口に吸引される水の流れが妨げられることが少なく、吸込み流れに適度の予旋回を与えることができ、自吸時には空気流と対向して還流される水が噴射されて十分かき混ぜられるため自吸時間が短いものである。
【0026】
また、放射状に一定断面で延びた吸引通路であって分離板の吐出側に向けて屈曲されるから、吸引通路内の流れを円滑な流れにすることができるとともに、同時に気水分離を行う吐出通路の部分を相対的に大きくすることができ、これにより押込み圧の反動圧を緩和することができ、ポンプをコンパクトにすることができる。また、屈曲があるため気水分離の際にこれに沿って流れる流れで比重の軽い空気を効果的に分離することができ、自動吸引可能な強制循環用の電気ポンプを大型化することなく、安価で提供することができるものである。
【図面の簡単な説明】
【図1】本発明の実施の形態1の電気ポンプの縦断側面図
【図2】同電気ポンプの縦断正面図
【図3】同電気ポンプにおけるケーシングカバーの斜視図
【図4】従来の電気ポンプの縦断側面図
【図5】同電気ポンプの縦断正面図
【図6】この種の電気ポンプが適用される還流配管系統の一例を示す概略配管図
【符号の説明】
1 駆動モータ部
2 駆動モータ
3 モータカバー
4 ブラケット
5 ポンプ部
6 ケーシング
7 シャフト
8 羽根車
9 メカニカルシール
10 パッキン
11 仕切板
12 ケーシングカバー
13 吸込口
14 吐出口
15 吸引通路
16 吐出通路
17 還流穴
18 還流配管
19 水槽
20 還流通路
21 羽根車吸込み口
22 分離板
23 突出部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric pump that is disposed in a circulation line of a fluid such as water and used for forced circulation of the fluid.
[0002]
[Prior art]
Conventionally, as this type of electric pump, for example, those shown in FIGS. 4 and 5 are known. 4 is a longitudinal side view of a conventional electric pump, and FIG. 5 is a longitudinal front view of the electric pump.
[0003]
The electric pump includes a drive motor unit 1 and a pump unit 5 as shown in FIG. The drive motor unit 1 includes a drive motor 2 and a pair of front and rear motor covers 3 in which the drive motor 2 is housed. A casing 6 of the pump unit 5 is provided on the front side of the motor cover 3 via a bracket 4. Are connected continuously. The shaft 7 of the drive motor 2 penetrates the bracket 4 and protrudes into the casing 6 of the pump unit 5, and the impeller 8 is integrally screwed and connected to the tip of the shaft 8 with the mechanical seal 9 interposed therebetween. Has been.
[0004]
The casing 6 has a front opening closed by a partition plate 11, and a casing cover 12 is disposed via the packing 10 with the partition plate 11 interposed therebetween. The casing cover 12 is formed with a suction port 13 and a discharge port 14. As shown in FIG. 5, the suction port 13 communicates with the suction side of the impeller 8 through the suction passage 15 of the casing 12. The discharge port 14 is opened in the casing cover 12 having the discharge passage 16, and is further communicated with the discharge side of the impeller 8 through a reflux hole 17 formed in the partition plate 11.
[0005]
An impeller suction port 21 is formed at a portion corresponding to the impeller 8 in the partition plate 11, and the suction passage 15 in the casing cover 12 extends radially from the impeller suction port 21 in a constant section. The suction passage 15 and the surrounding discharge passage 16 are defined by a separating plate 22. The upper surface of the separation plate 22 extends to the vicinity of the suction port 13 and is bent toward the discharge port side.
[0006]
FIG. 6 is a schematic piping diagram showing an example of a reflux piping system to which this type of electric pump is applied. The water in the water tank 19 is sucked and discharged through the reflux piping 18 as shown in FIG. The reflux pipe 18 has three vertical pipe parts parallel to each other and three upper and lower parts connecting these vertical pipe parts between the horizontal pipe part connected to the water tank 19 and the vertical pipe part connected to the pump P. It is composed of crank-shaped reciprocating communication pipe portions 18a and 18b comprising a horizontal pipe portion. First, water is introduced into the pump chamber, the drive motor 2 is turned on, the impeller 8 is rotated, and air and water are separated. Prior to the water, the air is discharged from the discharge port 14 to the water tank 19 through the discharge side pipe line 18a as shown by the arrow a in FIG. On the other hand, water and a small amount of residual air pass through the discharge passage 16 and return to the impeller 8 through the return hole 17 of the partition plate 11 as indicated by an arrow b in FIG. 5, and the water in the water tank 19 passes through the suction side pipe. It is led to the suction port 13 of the pump P through 18b.
[0007]
[Problems to be solved by the invention]
In the reflux pipe 18 bent at several places as described above, when the pump performs an automatic suction operation, water that reaches the suction port 13 of the pump P and is discharged from the discharge port 14 is discharged to the discharge side pipe line. When it flows out to 18a, a pushing pressure acts on the discharge side pipe line 18a, and a reaction of this pressure acts on the pump discharge port 14, so that air separated from the steam and water may escape to the discharge side pipe line 18a. Since the automatic suction operation becomes impossible and the suction passage 15 and the discharge passage 16 are connected, a recirculation passage that connects the suction passage 15 and the discharge passage 16 may be used to forcibly circulate even a pipe that is bent at several places. It was. However, by providing the above-described reflux passage, the circulating water flowing into the impeller 8 is scattered and the automatic suction efficiency is low. Therefore, the electric pump must be increased in size and expensive in terms of cost. Become.
[0008]
An object of the present invention is to provide an electric pump for forced circulation capable of automatic suction at a low cost without increasing the size even in a pipe bent at several places as described above.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention forms a reflux passage that connects the suction passage and the discharge passage of the casing cover at a front position that flows in through the suction passage, and protrudes from the casing cover so as to face the reflux passage. The electric pump is configured to have a portion.
[0010]
According to the present invention, since the return passage that connects the suction passage and the discharge passage of the casing cover is formed at the front position of the flow flowing in through the suction passage, the pipe is bent and the pump discharge side pipe Even in the state in which the pushing pressure is applied, the water in the discharge passage is smoothly circulated and returned to the suction side, whereby the reaction pressure of the pushing pressure can be relieved and the pump discharge pressure can be gradually increased. At this time, water circulated to the impeller through the reflux passage is scattered in the suction passage by the rotation of the impeller, but the protrusion provided on the casing cover suppresses the scattering of water and smoothly into the impeller. It can be circulated, and when it enters normal operation, the flow of water sucked from the impeller suction port is less disturbed. Has the effect of being
[0011]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, there is provided a casing in which an impeller is installed, a front surface of the casing via a partition plate and packing, and a suction passage extending from the impeller suction port is provided in the surrounding area. A casing cover that is defined by a discharge passage and a separation plate, and a drive motor that drives the impeller are provided. The separation plate is formed with a return passage in front of the flow that flows in through the suction passage. A projection is provided on the outer periphery of the impeller suction port in the outer periphery of the suction passage in the suction passage so as to face the passage, and the circulating water from the return passage, in which the projection is scattered in the suction passage, is supplied to the blade. It is an electric pump characterized by being returned to the car suction port, and can be provided at low cost without increasing the size of the electric pump for forced circulation that can be automatically sucked. Cormorant having an effect.
[0012]
Furthermore, the suction passage extends radially at a constant cross-section along a radial direction from the impeller suction opening, the separating plate, it is configured such that an end portion of the discharge port side is bent in the discharge port side Thus, the flow in the suction passage can be made smooth, and at the same time, the portion of the discharge passage for performing the steam separation can be made relatively large, thereby reducing the reaction pressure of the indentation pressure. The pump can be made compact.
[0013]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
(Embodiment 1)
FIG. 1 is a longitudinal side view of an electric pump according to a first embodiment of the present invention, FIG. 2 is a longitudinal front view of the electric pump, and FIG. 3 is a perspective view of a casing cover in the electric pump. The basic configuration of the electric pump according to the first embodiment is the same as that shown in the above-described conventional example, and portions having the same configuration and operation are denoted by the same reference numerals, and the overlap is avoided to avoid duplication. Description is omitted.
[0015]
The electric pump according to the first embodiment of the present invention is characterized by the configuration in the casing cover 12 of the pump unit 5. That is, as shown in FIGS. 1 to 3, the casing cover 12 of the pump unit 5 is provided with a reflux passage 20 that communicates the suction passage 15 and the discharge passage 16. The reflux passage 20 is formed in the arcuate portion of the separation plate 22 that circulates around the impeller suction port 21, that is, at the front position of the flow flowing in through the suction passage 15, and faces the reflux passage 20. The casing cover 12 is provided with a protrusion 23.
[0016]
Thus, even if the water circulating through the reflux passage 20 to the impeller 8 is scattered in the suction passage 15 by the rotation of the impeller 8, the water is blocked by the projecting portion 23 and is smoothly guided to the impeller 8.
[0017]
The suction passage 15 extends radially in a constant section, and the end of the separation plate 22 on the discharge port 14 side is slightly bent toward the discharge port 14 in the vicinity of the suction port 13 of the casing cover 12.
[0018]
As a result, water and air discharged from the casing 6 into the discharge passage 16 flow along the bent portion, and at this time, centripetal force acts and air having a low specific gravity can be effectively separated into air and water.
[0019]
Although some vortex flows are generated around the suction passage by the flow of water after the air-water separation, the reflux passage 20 is less likely to be affected because it is provided at the front position, and passes through the discharge passage 16. The circulating water can be smoothly circulated, the returned water is returned to the suction side, the reaction pressure of the pushing pressure is relaxed, and the discharge pressure of the pump can be gradually increased.
[0020]
Further, the protrusion 23 provided on the casing cover 12 is installed so as to be smaller than the cross-sectional area of the suction port 13 so as not to be a resistance of the water flowing in from the suction port 13, so that the circulation which is originally a function is performed. The flow rate is not impaired.
[0021]
A case where the water tank 19 is sucked and discharged through the bent reflux pipe 18 as shown in FIG. 6 using the electric pump having the above configuration will be described.
[0022]
First, when the drive motor 2 is turned on after priming water into the pump chamber, the impeller 8 rotates to separate the air and water, and the air is discharged before the water as shown by the arrow a in FIG. It is discharged from the outlet 14 through the water tank 19 to the atmosphere. On the other hand, water and a small amount of residual air pass through the discharge passage 16 and return to the discharge side of the impeller 8 through the return hole 17 of the partition plate 11 as shown by the arrow b in FIG. As indicated by c, the refrigerant passes through the reflux passage 20 and is returned to the suction side of the impeller 8. The water circulated through the reflux passage 20 flows into the impeller 8 and is scattered into the suction passage 15 by the rotation of the impeller 8. This is indicated by the arrow d in FIG. 2, but is blocked by the protrusion 23 provided on the casing cover 12, and is efficiently returned to the impeller 8 and circulated. Further, the water in the water tank 19 is guided to the suction port 13 of the pump p through the suction side 18b. At this time, in the vicinity of the impeller suction port 21, water that is recirculated in opposition to the air flow is injected into the air and is sufficiently stirred to promote the self-priming action.
[0023]
The water that has reached the suction port 13 of the pump passes through the pump and enters the state where the pushing pressure acts on the discharge side pipe line 18a. In this case, water is recirculated to the suction side of the impeller 8 from the recirculation passage 20 that connects the suction passage 15 and the discharge passage 16 of the casing cover 12, and the pump discharge pressure gradually increases and remains in the discharge side pipe 18a. Water can be pushed up smoothly and water can be circulated without difficulty. Further, when the normal operation is started, since the reflux passage 20 is provided at the front position of the water flowing in through the suction passage 15, the flow of water sucked into the impeller suction port 21 may be hindered. There are few, and moderate pre-turn is given.
[0024]
In the first embodiment, the protrusion provided on the casing cover is installed at a right angle to the suction port. However, it may be installed so as to be opposed to the reflux passage in the suction passage, and the same effect is obtained. And the effect is obtained.
[0025]
【The invention's effect】
As is clear from the above description, the electric pump of the present invention is formed at the front position where the reflux passage that connects the suction passage and the discharge passage of the casing cover flows through the suction passage, and faces the reflux passage. The protrusion provided on the casing cover suppresses the scattering of water, so that the water in the discharge passage can be smoothly circulated even when the pump piping is bent and the pressing pressure acts on the pump discharge side pipe line. This makes it possible to relieve the reaction pressure of the indentation pressure, and when entering normal operation, the flow of water sucked into the impeller suction port is less obstructed, and a moderate pre-swirl can be achieved The self-priming time is short because water recirculated opposite to the air flow is jetted and sufficiently stirred during self-priming.
[0026]
In addition, since the suction passage radially extends with a constant cross section and is bent toward the discharge side of the separation plate, the flow in the suction passage can be made smooth, and at the same time, the discharge performs air-water separation. The portion of the passage can be made relatively large, whereby the reaction pressure of the indentation pressure can be reduced, and the pump can be made compact. In addition, because there is a bend, air with a low specific gravity can be effectively separated by the flow that flows along the air-water separation, and without increasing the size of the electric pump for forced circulation that can be automatically sucked, It can be provided at low cost.
[Brief description of the drawings]
1 is a longitudinal side view of an electric pump according to a first embodiment of the present invention. FIG. 2 is a longitudinal front view of the electric pump. FIG. 3 is a perspective view of a casing cover of the electric pump. Fig. 5 is a vertical front view of the electric pump. Fig. 6 is a schematic piping diagram showing an example of a reflux piping system to which this type of electric pump is applied.
DESCRIPTION OF SYMBOLS 1 Drive motor part 2 Drive motor 3 Motor cover 4 Bracket 5 Pump part 6 Casing 7 Shaft 8 Impeller 9 Mechanical seal 10 Packing 11 Partition plate 12 Casing cover 13 Suction port 14 Discharge port 15 Suction passage 16 Discharge passage 17 Recirculation hole 18 Reflux hole Piping 19 Water tank 20 Reflux passage 21 Impeller inlet 22 Separation plate 23 Projection

Claims (1)

羽根車が内装されるケーシングと、前記ケーシングの前面に仕切板およびパッキンを介して配設されるとともに、羽根車吸い込み口から延びた吸引通路が周囲の吐出通路と分離板によって区画されて形成されたケーシングカバーと、前記羽根車を駆動する駆動モータとを備え、前記吸引通路は、前記羽根車吸い込み口からラジアル方向に沿って放射状に一定断面で延びており、分離板は、その吐出口側の端部が吐出口側に屈曲されており、前記分離板には前記吸引通路を通って流入する流れの正面位置に還流通路が形成され、前記還流通路に対向して前記羽根車吸い込み口より外周で前記ケーシングカバーの前記吸引通路内の上流に突出部を設け、前記突出部が前記吸引通路に飛散された前記還流通路からの循環水を前記羽根車吸い込み口に戻すものであることを特徴とする電気ポンプ。A casing in which the impeller is built, and a suction passage extending from the impeller suction port is defined by a surrounding discharge passage and a separation plate, and is disposed on the front surface of the casing via a partition plate and packing. A casing cover and a drive motor for driving the impeller, wherein the suction passage extends radially from the impeller suction port along a radial direction with a constant cross section, and the separation plate is disposed on the discharge port side. And a return passage is formed in the separation plate at a front position of the flow flowing in through the suction passage, facing the return passage from the impeller suction port. periphery with a projecting portion provided upstream of the said suction passage of the casing cover, the circulating water from the return path the projecting portion is scattered into the suction passage to the impeller suction port Electric pump, characterized in that it is to one.
JP2000182636A 2000-06-19 2000-06-19 Electric pump Expired - Fee Related JP4595164B2 (en)

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JP2010285972A (en) * 2009-06-15 2010-12-24 Rinnai Corp Self-priming pump
KR101903872B1 (en) * 2014-04-07 2018-10-02 트레비라 게엠베하 Polymer fibre having improved dispersibility
CN105604957A (en) * 2016-02-17 2016-05-25 广州奥姆特机电设备制造有限公司 Automatic self-priming pressure pump

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4975401U (en) * 1972-10-18 1974-06-29
JPH0383396U (en) * 1989-12-13 1991-08-23

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4975401U (en) * 1972-10-18 1974-06-29
JPH0383396U (en) * 1989-12-13 1991-08-23

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