JPH0537036Y2

JPH0537036Y2 -

Info

Publication number: JPH0537036Y2
Application number: JP1986200464U
Authority: JP
Priority date: 1986-12-27
Filing date: 1986-12-27
Publication date: 1993-09-20
Anticipated expiration: 2001-12-27
Also published as: JPS63105794U

Description

[Detailed explanation of the idea]

(イ) 産業上の利用分野本考案は自吸式ポンプに係り従来一般の自吸式
ポンプの改良に関する。 (ロ) 従来の技術及びその問題点本考案が改良しようとする従来の自吸式ポンプ
の一般例を第３，４，５図に示す。第３図はその
縦断面図で駆動室ケース１とインペラ・ケース２
とポンプカバー３とからなり、駆動室ケース１と
インペラ・ケース２とは隔板４を介して結合さ
れ、ポンプカバー３はインペラ・ケース２をカバ
ーして取付けられるが仕切り板５で仕切られる。
インペラ・ケース２内のインペラ室６には従動用
マグネツト７を備えるインペラ８が上記隔板４に
片持ちに回動自在に保持され、該インペラ室６の
上部は気水分離室９とされる。ポンプカバー３は
その上部が吸入室１０とされ、該吸入室１０の下
部で上記インペラ８の中央部該当個所の上記仕切
り板５に円孔１１があけられ吸入室１０のその部
分（吸入室１０の下部でポンプカバー３の中央部
の稍下部）が隔壁１２に囲まれインペラ８に吸水
される水の吸水室１３とされる。そして上記吸入
室１０の下部（ポンプカバー３の下部）はポンプ
の自吸作用用の水溜室１４とされる。上記第３図のＡ−Ａ矢示図（インペラ・ケース
２の右側面図）を第４図に、Ｂ−Ｂ矢示図（ポン
プカバー３の左側面図）を第５図に示す。即ち上
記第３図は第４，５図のＣ−Ｃ断面図である。該
第５図に示すようにポンプカバー３は吸入室１０
とその下部の水溜室１４と右側の吐出室１５とに
別けられ、吸入室１０上部に吸水ジヨイント１６
を吐出室１５に吐出ジヨイント１７を設ける。そ
して仕切り板５には右側上部に気水分離室９から
吐出室１５上部（吐出ジヨイント１７の直下）に
通ずる通口１８とその下部にやはり気水分離室９
から吐出室１５中間部に通ずる通口１９と、左側
下部に水溜室１４からインペラ室６に通ずる還流
孔２０があけられている。このように構成され、ポンプの始動時にはイン
ペラ室６・吸入室１０及び吸入室１０迄の配管内
には空気が残留しているので、先づこの空気を排
出しなければならない。そこで呼び水として水溜
室１４・インペラ室６下部には水を常に残してお
いて、上記仕切り板に還流孔２０をあけ水溜室１
４とインペラ室６とを連通させて、モータ（図示
しない）が駆動されインペラ８が回転（第４図の
Ｗ矢示方向）されると、水溜室１４内の水は仕切
り板５の還流孔２０からインペラ室６に吸入され
又同時に吸入室１０内の空気は吸水室１３から吸
入されてインペラ室６で水と空気が混合されて気
水分離室９に送られる。そして空気は仕切り板５
の上部通口１８を経て吐出ジヨイント１７から排
出され水は下部通口１９から吐出室１５下部に流
下する。そして吐出室１５下部と上記水溜室１４
はその下部で連通しているから、気水分離室９に
は連続して水と空気が送られ、上記の繰返しによ
り吸入室１０内は満水にされ吸送水運転即ち揚水
作用が行われる。（図の矢示W₁は水の流れ方向、
W₂はポンプが定常運転に入る迄の空気の流れ方
向を示す）。従来自吸式ポンプは上記のような構成・作用に
よつて、ポンプを駆動すれば自動的にポンプ内の
空気を排出して揚水作用が行われるようになるも
のであるが、インペラ室６においては空気混合水
は回転運動による遠心力のために、インペラ８の
外周部では密度が濃く中心部の吸水室１３部では
密度が薄く、実際には殆んど空気だけになつてし
まう。即ち自吸状態において従来の方法では吸水
室１３部では空気のみ又は空気の多い混合水が絶
えず滞留し均一な空気混合水とならずに自吸能力
を低下させている。又これを改善するためには通
常仕切り板５の水溜室１４からインペラ室６への
還流孔２０を拡げてインペラ８への還流水を増加
させる方法も取られているが、これでは還流水の
流れが増加してポンプ自体の吐出量が低下する不
利が伴う。 (ハ) 考案の目的本考案はポンプを始動してからポンプ内の空気
を排出する時間を短縮し短時間でポンプの揚水運
転を行わせ得るようにし、併せてポンプ性能も向
上させるものである。 (ニ) 考案の構成上記の如きインペラ８を片持型とする自吸式ポ
ンプにおいて、隔壁１２内の中央にポンプカバー
３の側面壁３ａからインペラ軸８ａに向けて円筒
部材３０を突設し、この円筒部材３０の径をイン
ペラ軸８ａの径よりも大きくしたものである。 (ホ) 実施例本考案に係る自吸式ポンプの一実施例につい
て、上記第３図同様の縦断面図を第１図に、第３
図のＢ−Ｂ矢示図同様の第１図Ｅ−Ｅ矢示図を第
２図に示す。該第１，２図においてその部分符号
の第３，５図と同一符号は同一部分を示す。この
自吸式ポンプは駆動用マグネツト２１等を収容す
る駆動室ケース１と、インペラ８を収容するイン
ペラーケース２と、ポンプカバー３との３体から
成つている。前記ポンプカバー３により、インペ
ラ８の前面で周囲を吸入室隔壁１２にて環状に区
画された吸水室１３と、この吸水室１３と連絡す
る吸入室１０と、呼び水を貯えておく水溜室１４
と、外部へ水を吐き出す吐出室１５が形成されて
いる。ここで本考案では、前記隔壁１２内の中央にポ
ンプカバー３の側面壁３ａからインペラ軸８ａに
向けて円筒部材３０を突設し、この円筒部材３０
の径をインペラ軸８ａの径よりも大きくしてい
る。すなわち、第１図および第２図に示すように、
前記隔壁１２の内側中央にインペラ軸８ａの径よ
りも大きく、実施例では軸受け８ｂの径と略同一
径の円筒部材３０をポンプカバー３の側面壁３ａ
からインペラ軸８ａに向けて突出させることで気
水混合液が吸水室１３の中心部に入り込まないよ
うにし、これにより自吸時に吸水室１３の空気と
水がインペラ８により吸引されるとき、インペラ
８の回転に伴う遠心力により空気が吸水室１３の
中心部に滞留するのを防止している。このため、インペラ室６と水溜室１４を連通さ
せている還流孔２０に小にして還流量を少なく
し、ポンプ性能を著しく高めることが可能とな
る。即ち吸水室１３を環状室としインペラ室６内に
吸入される気水混合液の混合度を均一なものとし
て吸水室１３内に残留する空気を短時間に排出す
るものである。そして上記円筒部材３０の径は大
きい方が自吸効率はよくなる訳であるが、該吸水
室１３の径はインペラ８の吸入効率を下げない程
度で上記水溜室１４をできるだけ大にする面から
インペラ８の大きさに従つて自ら決つて来るの
で、自吸性能を向上させ得るための最小の上記円
筒部材３０の大きさを実験により求めた処、円筒
部材３０の径をインペラ軸の軸径と同一寸度以下
にすると自吸性能を上げ得ない結果が得られた。
これを従来品と比較して下表に示す。下表におい
て考案品Ａは上記突出円筒部材３０の外径ｄがイ
ンペラ軸８ａの径の4/5のもの、考案品Ｂはイン
ペラ軸径と同一のもの、考案品Ｃはインペラ軸受
８ｂの約２倍（第１図に示す程度）のものを示
す。 (a) Industrial application field The present invention relates to self-priming pumps, and relates to improvements to conventional self-priming pumps. (b) Prior art and its problems General examples of conventional self-priming pumps that the present invention seeks to improve are shown in Figures 3, 4, and 5. Figure 3 is a longitudinal sectional view of drive chamber case 1 and impeller case 2.
The drive chamber case 1 and the impeller case 2 are connected via a partition plate 4, and the pump cover 3 is attached to cover the impeller case 2, but is separated by a partition plate 5.
In an impeller chamber 6 in the impeller case 2, an impeller 8 equipped with a driven magnet 7 is rotatably held in a cantilever manner by the partition plate 4, and the upper part of the impeller chamber 6 is used as a steam/water separation chamber 9. . The upper part of the pump cover 3 is a suction chamber 10, and at the lower part of the suction chamber 10, a circular hole 11 is bored in the partition plate 5 at a location corresponding to the center of the impeller 8. The lower part of the pump cover 3 (a slightly lower part of the central part of the pump cover 3) is surrounded by a partition wall 12 and serves as a water absorption chamber 13 for water absorbed by the impeller 8. The lower part of the suction chamber 10 (lower part of the pump cover 3) is used as a water reservoir chamber 14 for self-priming of the pump. FIG. 4 shows the view taken along the line A-A in FIG. 3 (right side view of the impeller case 2), and FIG. 5 shows the view taken along the line B-B (left side view of the pump cover 3). That is, the above-mentioned FIG. 3 is a sectional view taken along the line CC in FIGS. 4 and 5. As shown in FIG. 5, the pump cover 3 is connected to the suction chamber 10.
It is divided into a water reservoir chamber 14 at the bottom and a discharge chamber 15 on the right side, and a water absorption joint 16 is installed at the upper part of the suction chamber 10.
A discharge joint 17 is provided in the discharge chamber 15. The partition plate 5 has a passage 18 at the upper right side leading from the steam/water separation chamber 9 to the upper part of the discharge chamber 15 (directly below the discharge joint 17), and a steam/water separation chamber 9 at the bottom thereof.
A passage 19 is provided which communicates with the intermediate portion of the discharge chamber 15, and a reflux hole 20 which communicates with the impeller chamber 6 from the water reservoir chamber 14 is provided at the lower left side. With this structure, when the pump is started, air remains in the impeller chamber 6, the suction chamber 10, and the piping leading to the suction chamber 10, so this air must be discharged first. Therefore, water is always left in the lower part of the water reservoir chamber 14 and the impeller chamber 6 as priming, and a return hole 20 is made in the partition plate and the water reservoir chamber 1
4 and the impeller chamber 6, and when a motor (not shown) is driven and the impeller 8 is rotated (in the direction of arrow W in FIG. 4), the water in the water reservoir chamber 14 flows through the return hole of the partition plate 5. 20 into the impeller chamber 6, and at the same time, air in the suction chamber 10 is sucked in from the water suction chamber 13, water and air are mixed in the impeller chamber 6, and sent to the steam/water separation chamber 9. And the air is partition plate 5
The water is discharged from the discharge joint 17 through the upper passage 18 of the discharge chamber 15 and flows down through the lower passage 19 to the lower part of the discharge chamber 15. The lower part of the discharge chamber 15 and the water reservoir chamber 14
Since they communicate at the lower part, water and air are continuously sent to the steam/water separation chamber 9, and by repeating the above steps, the suction chamber 10 is filled with water and a water suction operation, that is, a pumping action is performed. (Arrow W ₁ in the figure is the direction of water flow,
W ₂ indicates the direction of air flow until the pump enters steady operation). Conventional self-priming pumps have the above-mentioned configuration and function, and when the pump is driven, the air inside the pump is automatically discharged to perform the pumping action. Because of the centrifugal force caused by the rotational movement, the air-mixed water has a high density at the outer periphery of the impeller 8 and a low density at the water absorption chamber 13 in the center, so that it actually consists of almost only air. That is, in the self-priming state, in the conventional method, only air or mixed water containing a large amount of air constantly accumulates in the water suction chamber 13, which does not result in uniform air-mixed water and reduces the self-priming ability. In order to improve this problem, a method is usually adopted in which the return hole 20 from the water reservoir chamber 14 to the impeller chamber 6 of the partition plate 5 is enlarged to increase the return water to the impeller 8. The disadvantage is that the flow increases and the output of the pump itself decreases. (c) Purpose of the invention This invention shortens the time for discharging the air inside the pump after starting the pump, allowing the pump to perform water pumping operation in a short period of time, and at the same time improving pump performance. . (d) Structure of the invention In the above-described self-priming pump in which the impeller 8 is cantilevered, a cylindrical member 30 is provided in the center of the partition wall 12 protruding from the side wall 3a of the pump cover 3 toward the impeller shaft 8a. , the diameter of this cylindrical member 30 is made larger than the diameter of the impeller shaft 8a. (e) Example Regarding an example of the self-priming pump according to the present invention, a vertical cross-sectional view similar to the above-mentioned FIG. 3 is shown in FIG. 1, and FIG.
FIG. 2 shows an E-E arrow diagram in FIG. 1, which is similar to the B-B arrow diagram in the figure. In FIGS. 1 and 2, the same reference numerals as in FIGS. 3 and 5 indicate the same parts. This self-priming pump consists of three bodies: a drive chamber case 1 that houses a drive magnet 21, etc., an impeller case 2 that houses an impeller 8, and a pump cover 3. The pump cover 3 provides a water suction chamber 13 which is divided into an annular shape by a suction chamber partition wall 12 in front of the impeller 8, a suction chamber 10 communicating with the water suction chamber 13, and a water reservoir chamber 14 for storing priming water.
A discharge chamber 15 is formed to discharge water to the outside. Here, in the present invention, a cylindrical member 30 is provided in the center of the partition wall 12 so as to protrude from the side wall 3a of the pump cover 3 toward the impeller shaft 8a.
The diameter of the impeller shaft 8a is made larger than the diameter of the impeller shaft 8a. That is, as shown in FIGS. 1 and 2,
A cylindrical member 30 having a diameter larger than the diameter of the impeller shaft 8a and approximately the same diameter as the bearing 8b in the embodiment is installed at the center inside the partition wall 12 on the side wall 3a of the pump cover 3.
The air-water mixture is prevented from entering the center of the water suction chamber 13 by protruding from the impeller shaft 8a toward the impeller shaft 8a. The centrifugal force caused by the rotation of the water absorption chamber 13 prevents air from staying in the center of the water absorption chamber 13. Therefore, it is possible to make the reflux hole 20 that communicates the impeller chamber 6 and the water reservoir chamber 14 smaller to reduce the amount of reflux, thereby significantly improving pump performance. That is, the water suction chamber 13 is made into an annular chamber, the degree of mixing of the air-water mixture sucked into the impeller chamber 6 is made uniform, and the air remaining in the water suction chamber 13 is discharged in a short time. The larger the diameter of the cylindrical member 30 is, the better the self-priming efficiency will be. 8, the minimum size of the cylindrical member 30 to improve the self-priming performance was determined by experiment, and the diameter of the cylindrical member 30 was determined by the diameter of the impeller shaft. If the dimensions were less than the same, the self-priming performance could not be improved.
A comparison with conventional products is shown in the table below. In the table below, device A has the protruding cylindrical member 30 whose outer diameter d is 4/5 of the diameter of the impeller shaft 8a, device B has the same diameter as the impeller shaft, and device C has the outer diameter d of the impeller bearing 8b. The figure is twice as large (as shown in Fig. 1).

【表】上表で考案品Ｃが自吸性能が大幅に向上したの
で、水溜室１４からインペラ室６への仕切り板５
の還流孔２０の個数を減らしたものでその結果ポ
ンプ性能も向上した。 (ヘ) 考案の効果本考案に係る自吸式ポンプは上記のように、吸
入室１０の吸水室１３が環状形とされるので吸水
室１３の中央部に空気の留りを生ずることがな
く、インペラ室６内に均一な気水混合水が吸入さ
れ自吸性能を大幅に向上すると共に還流孔２０を
小にできポンプ性能も向上させ得るものである。又本考案に係る自吸ポンプにおいては、第２図
に示すように環状吸水室１３の流水方向端部を邪
魔板３１で閉じるようにすれば、インペラには環
状吸水室１３の吸水慣性圧もかかるようになりイ
ンペラの吸入効率がより増大し、自吸性能もポン
プ性能も更に向上するものである。[Table] In the above table, since the self-priming performance of product C has been greatly improved, the partition plate 5 from the water reservoir chamber 14 to the impeller chamber 6 is
The number of reflux holes 20 is reduced, resulting in improved pump performance. (f) Effects of the invention As mentioned above, in the self-priming pump according to the invention, the water suction chamber 13 of the suction chamber 10 has an annular shape, so that air does not remain in the center of the water suction chamber 13. A uniform mixture of air and water is sucked into the impeller chamber 6, which greatly improves self-priming performance, and the size of the return hole 20 can be made smaller, thereby improving pump performance. Furthermore, in the self-priming pump according to the present invention, if the end of the annular water suction chamber 13 in the water flow direction is closed with the baffle plate 31 as shown in FIG. In this way, the suction efficiency of the impeller is further increased, and both self-priming performance and pump performance are further improved.

[Brief explanation of the drawing]

第１図は本考案に係る自吸式ポンプの実施例ポ
ンプの縦断面図で第２図はそのＥ−Ｅ方向（ポン
プカバー３に関する）側面図である。第３，４，
５図は従来型自吸式ポンプを示すもので、第３図
はその縦断面図（第４，５図のＣ−Ｃ断面図）、
第４図は第３図のＡ−Ａ方向側面図（インペラ・
ケースの側面図）、第５図は第３図のＢ−Ｂ方向
側面図（ポンプカバー即ち吸入室１０、水溜室１
４、吐出室１５の側面図）である。１……駆動室ケース、２……インペラ・ケー
ス、３……ポンプカバー、８……インペラ、８ａ
……インペラ軸、１０……吸入室、１２……吸水
室隔壁、１３……吸水室、１４……水溜室、１５
……吐出室、３０……円筒部材。 FIG. 1 is a longitudinal sectional view of an embodiment of the self-priming pump according to the present invention, and FIG. 2 is a side view thereof in the EE direction (with respect to the pump cover 3). 3rd, 4th,
Figure 5 shows a conventional self-priming pump, and Figure 3 is a longitudinal cross-sectional view (C-C cross-sectional view in Figures 4 and 5).
Figure 4 is a side view in the A-A direction of Figure 3 (impeller
Fig. 5 is a side view in the B-B direction of Fig. 3 (pump cover, i.e., suction chamber 10, water reservoir chamber 1).
4) is a side view of the discharge chamber 15). 1... Drive chamber case, 2... Impeller case, 3... Pump cover, 8... Impeller, 8a
... Impeller shaft, 10 ... Suction chamber, 12 ... Water absorption chamber partition, 13 ... Water absorption chamber, 14 ... Water reservoir chamber, 15
...Discharge chamber, 30...Cylindrical member.

Claims

[Claims for Utility Model Registration] A drive chamber case 1 that accommodates a drive means 21, an impeller case 2 that accommodates an impeller 8, and a water absorption chamber 13 that is annularly divided in front of the impeller 8 by a partition wall 12. It consists of three bodies: a water suction chamber 10 communicating with this water suction chamber 13, a water reservoir chamber 14 for storing priming water, and a pump cover 3 forming a discharge chamber 15 for discharging water to the outside.
In a self-priming pump having a cantilever type, a cylindrical member 30 is disposed at the center of the partition wall 12 from the side wall 3a of the pump cover 3 toward the impeller shaft 8a.
is provided protrudingly, and the diameter of this cylindrical member 30 is set to the impeller shaft 8.
A self-priming pump characterized by having a diameter larger than that of a.