JPS5879687A - Water-tight type pump - Google Patents

Abstract

PURPOSE:To reduce the affect of corrosion to an impeller due to the cavitation of hydraulic water and as well to simplify the manufacturing of the pump, by forming the impeller with a plurality of axially divided sections, and by enabling the sections to be replaced with each others. CONSTITUTION:An impller 31 is axially divided into a plurality of sections. The divided impeller part 31a in the middle section is formed of a cast made of cast iron having a good castability, such as, for example, ductile cast iron, and divided impeller parts 31b in both end sections are made of cast iron such as, for example, ductile cast iron or stainless steel of corrosion resistant material. Further, the divided parts 31a, 31b are axially fastened so that their end face are mated together and then, are mounted onto a rotary shaft 32, thereby, they may be replaced together.

Description

【発明の詳細な説明】 この発明は水封式ポンプにわいて、作動水のキャビチー
シーンによ′る羽根車の腐食の゛影−を軽減することが
できるようにしｆこもの暴ζ関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to water-ring pumps, which can reduce the impact of impeller corrosion due to cavity scenes of working water, and reduce the effects of corrosion on impellers caused by cavity scenes of working water. .

水封式ポンプの従来例を第１図および第２図−こもとづ
いて説明する。こ４Ｌらの図において、円筒状をなすボ
スｌａの外周に多数の羽根１ｂを放射状番こ設けてなる
軸方向に長いｓｌ物製の羽根車１が円筒状のケーシング
２で偏心的に包囲さ４Ｌ％サイドカバー８が前記羽根車
ｌの端面と対向するボートブレート４を介してケーシン
グ２の端面に固定取付けさｊしている。前記サイドカバ
ー８には吸気口９に、排気口８ｂおよび作動水を圧入す
るための給水口８Ｃがそｎぞれケーシング２Ｇ内室と遅
過するように設けら４している。前記給水口８Ｃからケ
ーシング２内に注入さｔｂｌ二作動作動水根車ｌの回転
に伴う遠心力によりケーシング２の内周に押しつけらＪ
して水ｊｌ１６を形成し、この水環５で羽根車１とケー
シング２の間隙を封じてケーシング２の内室の中心に前
記羽根１ｂで放射状に仕切らｌＬｆこ空轡６を作るよう
になっている。羽根車１はケーシング２に対し偏心回転
するので羽根車ｌの１転に伴い個々の空ｍ６の断面積が
縮小し、これにより内部空気の圧縮排出作用を行って前
記吸気口８ａから空気を吸引し、排気口８ｂから排出す
る。A conventional example of a water ring type pump will be explained with reference to FIGS. 1 and 2. In these figures, an axially long impeller 1 made of SL material, which has a large number of blades 1b arranged radially around the outer periphery of a cylindrical boss la, is eccentrically surrounded by a cylindrical casing 2. A 4L% side cover 8 is fixedly attached to the end face of the casing 2 via a boat plate 4 facing the end face of the impeller l. The side cover 8 is provided with an intake port 9, an exhaust port 8b, and a water supply port 8C for pressurizing working water so as to lag behind the inner chamber of the casing 2G. Water is injected into the casing 2 from the water supply port 8C and is pressed against the inner circumference of the casing 2 by the centrifugal force accompanying the rotation of the water root wheel.
The water ring 5 seals the gap between the impeller 1 and the casing 2, and the vane 1b radially partitions the inner chamber of the casing 2 to create a space 6. There is. Since the impeller 1 rotates eccentrically with respect to the casing 2, the cross-sectional area of each air space m6 decreases as the impeller 1 rotates once, thereby compressing and discharging the internal air and sucking air from the intake port 8a. Then, it is discharged from the exhaust port 8b.

このような構造では圧力変化の大きい羽ＩＩＭ＊１の内
端部で作動水のキャビテーラ１ンを生じ、これにより羽
根車ｌを腐食してポンプ効率を低下させることがあると
いう欠点があつ１こ。また羽根率ｌが軸方向に長く、隣
接する羽根１ｂの間隔も狭いので精度を出して羽根車１
を鋳造することが困峻であるという欠点があつｔこ。One disadvantage of this structure is that a cavity 1 of working water is formed at the inner end of the impeller IIM*1 where pressure changes are large, which may corrode the impeller 1 and reduce pump efficiency. . In addition, since the blade ratio l is long in the axial direction and the interval between adjacent blades 1b is narrow, the impeller 1
The disadvantage is that it is difficult to cast.

この発明は前記の欠点を除去するγこめに、作動水のキ
ャビチーシーンによる羽根車の餌食の影響を軽減すると
ともに、羽根率を容易に製作することかできるようにし
た水封式ポンプを提供することを目的とする。In order to eliminate the above-mentioned drawbacks, the present invention provides a water ring pump that reduces the influence of the impeller being preyed upon by the cavity scene of the working water and that allows the blade ratio to be easily manufactured. The purpose is to

以下、この発明の実施例を図面にもとづいて説明する。Embodiments of the present invention will be described below based on the drawings.

第８図はこの発明による水封式ポンプを示すもので、第
１図および第２図と同一符号で示すものは同一部品であ
る。この図におけるポンプは、羽根車３１が軸方向に複
数（この図では４段）に分割形成され、中央部の分割羽
根車３１　ｍは鋳造性のよい例えばダクタイル鋳鉄等の
鋳物で作られ、絢端部の分割羽根車３１　ｂはダクタイ
ル鋳鉄等の鋳物かまｆこはステンレス鋳物等の耐食材で
形成さ４している。前記分ｍ羽根軍３１　＆と３１　ｂ
はそれぞｉＬの端面が互に接合するように軸方向に締付
けて回紘輔３２に取付けらオシ、相互に取替えることが
できるようになっている。FIG. 8 shows a water ring type pump according to the present invention, and parts indicated by the same reference numerals as in FIGS. 1 and 2 are the same parts. In the pump shown in this figure, the impeller 31 is divided into a plurality of stages (four stages in this figure) in the axial direction, and the central divided impeller 31m is made of cast metal, such as ductile cast iron, which has good castability. The split impeller 31b at the end is made of a cast metal such as ductile cast iron, and is made of corrosion-resistant material such as stainless steel casting. Said minute m feather army 31 & and 31 b
are attached to the rotation pipe 32 by tightening in the axial direction so that the end faces of iL are joined to each other, and can be replaced with each other.

前記実施例によれば両端部の分割羽根車３１　ｂを耐食
材で形成し１こ場合には作動水のキャビチーシーンによ
る腐食を防止することができ、ダクタイル鋳鉄等を使用
して腐食を生じｆこ場合には中央部の分割羽根車３１　
＆と取替えて腐食の進行を防止することができる。まｔ
こ羽根車３１を分割形成することにより個々の分割羽根
＄３１＆、３１ｂが軸方向に短くなるので精度を出して
鋳造することができる。According to the embodiment, the divided impellers 31b at both ends are made of corrosion-resistant material, and in this case, it is possible to prevent corrosion due to the cavity scene of the working water. f In this case, the central divided impeller 31
The progress of corrosion can be prevented by replacing with &. Yes
By forming the impeller 31 in parts, the individual divided blades 31&, 31b are shortened in the axial direction, so that they can be cast with high accuracy.

さらに分割羽根車３１　＆　、　３１　ｂの段数を調整
することによりポンプ性能の対応範囲を増すことができ
る。Furthermore, by adjusting the number of stages of the divided impellers 31 &, 31b, the range of pump performance can be increased.

以上述べ１こように、この究明によれば水封式ポンプに
おいて、羽根車を一方向に複数に分割形成するとともに
、そ（Ｌぞれを相互に取替えできるように構成しｆこの
で、作動水のキャビチーシーンによる羽根車端部の腐食
の影響を軽減することができ、まｔこ個々の分割羽根車
が軸方向に短くなるので鋳造作業か′＃易となり、さら
に分割羽根車の段数を調整してポンプ性能の対応範囲を
増すこと力Ｓできるという効果が得られる。As stated above, according to this research, in a water ring pump, the impeller is divided into a plurality of parts in one direction, and each of the impellers (L) is configured to be mutually replaceable. The effect of corrosion on the end of the impeller due to the cavity of water can be reduced, and since each segmented impeller is shortened in the axial direction, casting work becomes easier, and the number of stages of the segmented impeller can be reduced. This has the effect of increasing the range of pump performance by adjusting the force S.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の水封式ポンプを示す縦断面図、ｗＳ２図
は第１図の川−■縁に沿う縦１ｌｒＯｋ］図、第８図は
この発明による水封式ポンプを示す縦断面図である。 ３１・・・羽根車、　３１　＆　、３１　ｂ・・・分割
羽根率。 第３図Fig. 1 is a longitudinal sectional view showing a conventional water ring pump, Fig. wS2 is a vertical 1lrOk] view along the river-■ edge of Fig. 1, and Fig. 8 is a longitudinal sectional view showing a water ring pump according to the present invention. It is. 31... Impeller, 31 &, 31 b... Division blade ratio. Figure 3

Claims (1)

【特許請求の範囲】 １）円筒状をなすボスの外周に多数の羽根を放射状に設
けてなる羽根率を軸方向に複数に分割形成するとともに
、この分割羽根率を相互に取替え可能に設けｆこことを
特徴とする水封式ポンプ。 ２、特許請求の範囲第１項記載の水封式ポンプにおいて
、内端の分割羽根率を耐食材で形成しｔζことを特徴と
する水封式ポンプ。[Scope of Claims] 1) A number of blades are provided radially around the outer periphery of a cylindrical boss, and the blade ratio is divided into a plurality of blades in the axial direction, and the divided blade ratios are provided so as to be mutually replaceable. A water ring pump with the following features. 2. A water ring pump according to claim 1, characterized in that the divided blade ratio at the inner end is made of corrosion-resistant material.