JPH0587292U - Centrifugal pump - Google Patents
Centrifugal pumpInfo
- Publication number
- JPH0587292U JPH0587292U JP2618992U JP2618992U JPH0587292U JP H0587292 U JPH0587292 U JP H0587292U JP 2618992 U JP2618992 U JP 2618992U JP 2618992 U JP2618992 U JP 2618992U JP H0587292 U JPH0587292 U JP H0587292U
- Authority
- JP
- Japan
- Prior art keywords
- blade
- impeller
- centrifugal pump
- peripheral portion
- range
- 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.)
- Granted
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
(57)【要約】
【目的】極小流量域で大揚程の吸上運転を行っても有害
な気泡が発生せず、製造コストおよび運転コストを節減
できる遠心ポンプを提供する。
【構成】遠心ポンプにおけるインペラ5が、流路11の
周方向中央15から最寄りの羽根10の表側16までの
範囲で、かつインペラリング12の外周部16から羽根
10の内周部18までの範囲に対向位置して後シュラウ
ド9に開設された貫通孔19を具備することを特徴とす
る。
【作用】吐出された高圧水の一部が上記貫通孔を経て羽
根の内周近傍に導かれ、負圧を緩和することにより気泡
発生が防止される。
(57) [Summary] [Purpose] To provide a centrifugal pump that does not generate harmful bubbles even when performing a suction operation with a large head in an extremely small flow rate range, and can reduce manufacturing costs and operation costs. [Structure] An impeller 5 in a centrifugal pump is in a range from a circumferential center 15 of a flow path 11 to a front side 16 of a blade 10 which is the closest to the impeller ring 12, and from an outer peripheral portion 16 of the impeller ring 12 to an inner peripheral portion 18 of the blade 10. And a through hole 19 formed in the rear shroud 9 facing each other. A part of the discharged high pressure water is guided to the vicinity of the inner circumference of the blade through the through hole, and the negative pressure is relieved to prevent bubbles from being generated.
Description
【0001】[0001]
本考案は、例えば小型給水装置などにおけるように、主として吸上げ運転され る遠心ポンプに関する。 The present invention relates to a centrifugal pump that is mainly operated for suction, such as in a small water supply device.
【0002】[0002]
遠心ポンプを締切運転に近い極小流量域で吸上げ運転すると、負圧になる羽根 の入口近傍においては水流方向と羽根表側との挟角が大きいため水の剥離現象が 生じ、水中の空気が遊離して生じた気泡が滞留する。このような現象は吸上げ揚 程が大きいほど、また、吐出流量が少ないほど発生しやすく、長引くと滞留気泡 量が増加して吐出揚程が低下し、遂には揚水不能に陥ってしまう。 When the centrifugal pump sucks up in a very small flow rate range close to the deadline operation, water separation occurs because the angle between the water flow direction and the blade front side is large near the inlet of the blade where negative pressure occurs, and air in water is released. The air bubbles generated as a result stay. Such a phenomenon is more likely to occur as the suction head is larger and the discharge flow rate is smaller, and if the suction head is prolonged, the amount of accumulated bubbles increases and the discharge head decreases, and eventually pumping becomes impossible.
【0003】 従来は、このような問題の解決策としてジェット方式あるいは逃がし弁方式な どにより揚水の一部を吐出側から吸込側に還流させ、需要流量が少なくてもイン ペラにおける通過流量を多くするようにしていた。Conventionally, as a solution to such a problem, a part of pumped water is recirculated from the discharge side to the suction side by a jet method or a relief valve method, and the flow rate through the impeller is increased even if the demand flow rate is low. I was trying to do it.
【0004】[0004]
上述のような従来の解決策では、ジェットポンプまたは逃がし弁のみならずバ イパス流路等が必要なため装置構造が複雑で部品点数も多く、必然的に製造コス トが高くなる。また、気泡の発生を防止するために余分の水を吸上げることにな るので運転コストも増大するなどの難点がある。 In the conventional solution as described above, not only the jet pump or the relief valve but also the bypass flow passage and the like are required, so that the device structure is complicated and the number of parts is large, and the manufacturing cost is inevitably high. Further, since extra water is sucked up in order to prevent the generation of bubbles, there is a drawback that the operating cost also increases.
【0005】 本考案は上述のような問題点を解決するためになされたもので、吸上げ揚程が 大きく、かつ極小流量域でも気泡の発生が防止され、しかも製造コストおよび運 転コストを節減できる遠心ポンプを提供することを目的とする。The present invention has been made in order to solve the above-mentioned problems, and has a large suction head, prevents bubbles from being generated even in an extremely small flow rate range, and can reduce manufacturing costs and operating costs. The purpose is to provide a centrifugal pump.
【0006】[0006]
本考案は、遠心ポンプにおけるインペラが、流路の周方向中央から最寄りの羽 根表側までの範囲で、かつインペラリングの外周部から羽根の内周部までの範囲 に対向位置して後シュラウドに開設された貫通孔を具備することを特徴とするも のである。 According to the present invention, the impeller in the centrifugal pump is located in the range from the center of the flow passage in the circumferential direction to the nearest blade surface side, and in the range from the outer peripheral part of the impeller ring to the inner peripheral part of the blade in the rear shroud. It is characterized by having an opened through hole.
【0007】[0007]
上記構成において、ポンプ運転中はインペラから吐出された高圧水の一部が後 シュラウドの背後から貫通孔を経て羽根の内周部近傍に導かれ、そのため負圧が 緩和されることにより気泡の発生ないし滞留が防止される。 In the above configuration, during pump operation, part of the high-pressure water discharged from the impeller is guided from the rear of the rear shroud to the vicinity of the inner circumference of the blade through the through hole, and the negative pressure is relieved, thereby generating bubbles. Or retention is prevented.
【0008】[0008]
以下、本考案につき図1および図2に示す一実施例を参照しながら説明する。 図1において、遠心ポンプのケーシング1およびケーシングカバー2の内部に は、電動機3の主軸4に支持されたインペラ5が回転自在に収容されており、そ の軸方向両側にはそれぞれ若干の間隙6,7が形成されている。 The present invention will be described below with reference to an embodiment shown in FIGS. In FIG. 1, an impeller 5 supported by a main shaft 4 of an electric motor 3 is rotatably housed inside a casing 1 and a casing cover 2 of a centrifugal pump, and a slight gap 6 is formed on both sides in the axial direction. , 7 are formed.
【0009】 インペラ5は、図2に示すように前後方向に対向する一対の前シュラウド8お よび後シュラウド9ならびに、これらの間に介在して周方向に交互に配設された 複数の渦巻状羽根10(図は3つのみを示す)および流路11を備えている。ま た、前シュラウド8の前側にはインペラリング12が軸方向に突設されている。 そして、インペラ5の流入口13はインペラリング12に開設されており、流出 口14は外周部に配設されている。As shown in FIG. 2, the impeller 5 includes a pair of front shrouds 8 and rear shrouds 9 facing each other in the front-rear direction, and a plurality of spirally-shaped spiral shrouds disposed therebetween in an alternating manner in the circumferential direction. It has vanes 10 (only three are shown in the figure) and channels 11. Further, an impeller ring 12 is provided on the front side of the front shroud 8 so as to project in the axial direction. The inflow port 13 of the impeller 5 is opened in the impeller ring 12, and the outflow port 14 is arranged in the outer peripheral portion.
【0010】 上記後シュラウド9には、上記流路11の周方向中央15から最寄りの羽根1 0の表側16までの範囲で、かつ上記インペラリング12の外周部17から羽根 10の内周部18までの範囲に対向位置して(2つの範囲の共通部分にハッチン グを施して示す)流路11と間隙7とを連通する所望数(図は2つの場合)の貫 通孔19が開設されている。 次に上記実施例の作用を説明する。The rear shroud 9 has a range from the center 15 of the flow passage 11 in the circumferential direction to the front side 16 of the nearest blade 10, and the outer peripheral portion 17 of the impeller ring 12 to the inner peripheral portion 18 of the blade 10. Up to a desired number (two in the figure) of through-holes 19 communicating between the flow path 11 and the gap 7 are formed at positions opposite to each other (shown by hatching the common part of the two ranges). ing. Next, the operation of the above embodiment will be described.
【0011】 上記電動機3を介してインペラ5を回転駆動すると、流入口13から吸込まれ た水が遠心力により昇圧されて流出口14から吐出され、大部分は外部に供給さ れるが一部は上記間隙6,7に導かれる。その際、相隣る羽根10,10の間に おける水圧は流出口14に近づくほど高くなるから、一旦流出口14から流出し た高圧水の一部は、後シュラウド9の外側間隙7から貫通孔19を経て羽根10 の内周部18近傍に流出する。When the impeller 5 is rotationally driven through the electric motor 3, the water sucked from the inflow port 13 is pressurized by the centrifugal force and discharged from the outflow port 14, and most of it is supplied to the outside, but part of it is supplied. It is guided to the gaps 6 and 7. At this time, the water pressure between the adjacent blades 10, 10 becomes higher as it approaches the outlet 14, so that part of the high-pressure water that has once flowed out of the outlet 14 penetrates through the outer gap 7 of the rear shroud 9. It flows out through the hole 19 to the vicinity of the inner peripheral portion 18 of the blade 10.
【0012】 いま、貫通孔19を羽根10の外周部寄りに設けたと仮定すれば、外周部に近 付くほど流路内圧力が高くなるため空気の遊離が少なく、必然的に十分な気泡防 止効果は得られない。また、流路11内における水流の周方向成分が羽根10の 表側から裏側に向かっているので、貫通孔19を羽根の裏側近傍に設けると噴出 された圧力水が表側方向には拡散されず、表側近傍においては圧力が上昇しない ため空気の遊離に基づく気泡が発生することになる。Assuming that the through hole 19 is provided near the outer peripheral portion of the blade 10, the pressure in the flow passage increases as the blade approaches the outer peripheral portion, so that air is less released and inevitably sufficient bubble blocking is achieved. No effect. Further, since the circumferential component of the water flow in the flow passage 11 is directed from the front side to the back side of the blade 10, if the through hole 19 is provided near the back side of the blade, the jetted pressure water is not diffused in the front side direction, Since the pressure does not rise near the front side, bubbles are generated due to the release of air.
【0013】 これに対し、上記実施例においては圧力が最低な羽根内周部18近傍に高圧水 が噴出されるから、低圧部の圧力が極めて効果的に上昇される。したがって締切 運転に近い極小流量域で高揚程の吸込運転を行っても気泡の発生ないし成長が効 果的に防止され、滞留気泡によってポンプが揚水不能に陥るようなことはない。 しかも、そのためには上記貫通孔19を開設するだけでよいから構造が簡単で 追加部品が不要であり、かつ小形化も可能であるから製造コストを節減すること ができる。また、高圧側から低圧側に還流される水量が僅かであるから運転コス トの増加も僅少ですむ。On the other hand, in the above embodiment, the high-pressure water is jetted out in the vicinity of the blade inner peripheral portion 18 where the pressure is lowest, so that the pressure in the low-pressure portion is extremely effectively increased. Therefore, even if the suction operation with a high head is performed in the minimum flow rate region close to the dead-time operation, the generation or growth of bubbles is effectively prevented, and the accumulated bubbles do not cause the pump to be unable to pump. In addition, for that purpose, since it is only necessary to open the through hole 19, the structure is simple, no additional parts are required, and the size can be reduced, so that the manufacturing cost can be reduced. In addition, since the amount of water recirculated from the high pressure side to the low pressure side is small, the increase in operating cost is also small.
【0014】 なお、本考案は上記実施例のみに限定されるものではなく、例えば多段遠心ポ ンプにおける1段目に適用すれば効果的である。その他、本考案の要旨とすると ころの範囲内で種々の変更ないし応用が可能である。It should be noted that the present invention is not limited to the above embodiment, but is effective when applied to the first stage in a multistage centrifugal pump, for example. In addition, various modifications and applications are possible within the scope of the present invention.
【0015】[0015]
以上説明したように本考案によれば、吸上げ揚程が大きく、かつ極少流量域で も気泡の発生が防止され、しかも製造コストおよび運転コストを節減可能な遠心 ポンプを提供することができる。 As described above, according to the present invention, it is possible to provide a centrifugal pump that has a large suction head, prevents bubbles from being generated even in an extremely small flow rate range, and can reduce manufacturing costs and operating costs.
【図1】本考案の一実施例を示す切欠側面図。FIG. 1 is a cutaway side view showing an embodiment of the present invention.
【図2】同実施例におけるインペラを示し、(A)は
(B)のA−A線に沿う断面図、(B)は(A)のB−
B線に沿う断面図。FIG. 2 shows an impeller in the embodiment, (A) is a cross-sectional view taken along the line AA of (B), and (B) is a cross section of (A).
Sectional drawing which follows the B line.
5…インペラ,8…前シュラウド、9…後シュラウド、
10…羽根、11…流路、12…インペラリング、15
…中央、16…表側、17…外周部、18…内周部、1
9…貫通孔。5 ... impeller, 8 ... front shroud, 9 ... rear shroud,
10 ... Blade, 11 ... Flow path, 12 ... Impeller ring, 15
... center, 16 ... front side, 17 ... outer peripheral portion, 18 ... inner peripheral portion, 1
9 ... Through hole.
Claims (1)
する前シュラウド、これと対向する後シュラウドならび
に、これらシュラウド間に介在して周方向に交互に配設
された複数の渦巻状羽根および流路を有するインペラを
備えた遠心ポンプにおいて、上記流路の周方向中央から
最寄りの羽根表側までの範囲で、かつ上記インペラリン
グの外周部から羽根の内周部までの範囲に対向位置して
上記後シュラウドに開設された貫通孔を具備することを
特徴とする遠心ポンプ。1. A front shroud having an impeller ring projecting in the axial direction, a rear shroud facing the shroud, and a plurality of spiral blades and a stream interposed between the shrouds and arranged alternately in the circumferential direction. In a centrifugal pump provided with an impeller having a passage, in the range from the circumferential center of the flow path to the nearest blade surface side, and facing the range from the outer peripheral portion of the impeller ring to the inner peripheral portion of the blade, A centrifugal pump comprising a through hole formed in a rear shroud.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2618992U JP2566971Y2 (en) | 1992-04-22 | 1992-04-22 | Centrifugal pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2618992U JP2566971Y2 (en) | 1992-04-22 | 1992-04-22 | Centrifugal pump |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0587292U true JPH0587292U (en) | 1993-11-26 |
JP2566971Y2 JP2566971Y2 (en) | 1998-03-30 |
Family
ID=12186556
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2618992U Expired - Lifetime JP2566971Y2 (en) | 1992-04-22 | 1992-04-22 | Centrifugal pump |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2566971Y2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020029797A (en) * | 2018-08-21 | 2020-02-27 | 株式会社酉島製作所 | One-side suction pump |
KR102115816B1 (en) * | 2019-09-20 | 2020-05-27 | 윤홍태 | Pump |
-
1992
- 1992-04-22 JP JP2618992U patent/JP2566971Y2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020029797A (en) * | 2018-08-21 | 2020-02-27 | 株式会社酉島製作所 | One-side suction pump |
KR102115816B1 (en) * | 2019-09-20 | 2020-05-27 | 윤홍태 | Pump |
Also Published As
Publication number | Publication date |
---|---|
JP2566971Y2 (en) | 1998-03-30 |
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