JP4858329B2 - Centrifugal pump and liquid supply apparatus provided with the same - Google Patents

Centrifugal pump and liquid supply apparatus provided with the same Download PDF

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JP4858329B2
JP4858329B2 JP2007164224A JP2007164224A JP4858329B2 JP 4858329 B2 JP4858329 B2 JP 4858329B2 JP 2007164224 A JP2007164224 A JP 2007164224A JP 2007164224 A JP2007164224 A JP 2007164224A JP 4858329 B2 JP4858329 B2 JP 4858329B2
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impeller
liquid
centrifugal pump
flow path
pump
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JP2009002245A (en
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哲也 福田
敏輔 酒井
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Panasonic Corp
Panasonic Electric Works Co Ltd
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Panasonic Corp
Matsushita Electric Works Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0673—Units comprising pumps and their driving means the pump being electrically driven the motor being of the inside-out type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/001—Preventing vapour lock
    • F04D9/002—Preventing vapour lock by means in the very pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

本発明は、羽根車の回転で液体を吸入吐出する遠心ポンプ、殊に気体が混入した液体の吐出も可能な遠心ポンプとこれを備えた液体供給装置に関するものである。   The present invention relates to a centrifugal pump that sucks and discharges liquid by rotation of an impeller, and more particularly to a centrifugal pump that can also discharge liquid mixed with gas and a liquid supply apparatus including the centrifugal pump.

遠心ポンプは、羽根車を回転させて遠心力によって液体の圧力を高めて吐出するものであるために、気体が混入した場合、遠心力の作用で気液が分離して液体よりも比重が軽い気体が羽根車の中心部に滞留し、液体の吐出能力が低下してしまう。   Centrifugal pumps rotate the impeller and increase the pressure of the liquid by centrifugal force to discharge. Therefore, when gas is mixed, the gas and liquid are separated by the action of centrifugal force and the specific gravity is lighter than that of the liquid. The gas stays in the center of the impeller, and the liquid discharge capability decreases.

このために気体が混入している液体を吐出するものにおいては、羽根車の中心部付近に軸方向に貫通する環流路を設けて、羽根車の回転で圧力が高くなった液体が羽根車の外周側から背面側に至る副流路を回って上記環流路から上記気体が滞留している空間に噴出するようにして、この噴出によって滞留している気体（気泡）を粉砕して微小気泡とし、この状態の気体を羽根車の回転で液体と共に吐出するようにしたものが提供されている。   For this reason, in the case of discharging liquid mixed with gas, an annular passage that penetrates in the axial direction is provided near the center of the impeller so that the liquid whose pressure is increased by the rotation of the impeller The gas (bubbles) retained by this ejection is pulverized into microbubbles by going around the sub-flow path from the outer peripheral side to the back side and ejecting from the annular flow path to the space where the gas is retained. There is provided a gas in which the gas in this state is discharged together with the liquid by rotation of the impeller.

しかし、ポンプの駆動前から上記副流路に気体が滞留していた場合は、上記環流路を通じた気泡粉砕用の高圧液体を供給することができないために、運転不能の状態に陥ってしまう。   However, if the gas stays in the sub-flow channel before the pump is driven, the high-pressure liquid for crushing the bubbles through the ring flow channel cannot be supplied, so that the operation becomes impossible.

羽根車を回転駆動するための駆動機構の中央部を貫通して羽根車の回転軸芯に沿って羽根車の位置まで挿入されている排気管を設けて、この排気管を通じて気体を排出するもの（特許文献１参照）では、上記副流路における気体の滞留による運転不能の状態に陥ることはないものの、液体の吸い込み口から吐出口に至る主流路中に一端が位置する排気管によって負圧が発生するために、十分な性能を得ることが困難である。
特開平４−４１９９８号公報 An exhaust pipe that passes through the center of the drive mechanism for rotationally driving the impeller and is inserted to the position of the impeller along the rotational axis of the impeller is provided, and gas is discharged through the exhaust pipe In Patent Document 1, although there is no inoperable state due to gas retention in the sub-flow channel, negative pressure is generated by an exhaust pipe having one end located in the main flow channel from the liquid suction port to the discharge port. Therefore, it is difficult to obtain sufficient performance.
JP-A-4-41998

本発明は上記の従来の問題点に鑑みて発明したものであって、羽根車の回転による昇圧機構を極力損なうことなくポンプ室内に滞留した気体の排出を行うことができるポンプとこれを用いた液体供給装置を提供することを課題とするものである。   The present invention has been invented in view of the above-described conventional problems, and uses a pump capable of discharging the gas retained in the pump chamber without losing the pressure increasing mechanism by rotating the impeller as much as possible. An object of the present invention is to provide a liquid supply apparatus.

上記課題を解決するために本発明は、回転駆動される羽根車を備えて、該羽根車の回転で吸い込み口から吸い込んだ液体を遠心力によって加圧して吐出口から送り出す遠心ポンプにおいて、上記羽根車はその中心部に該羽根車の表面側と裏面側とをつなぐ環流路を備え、上記羽根車の裏面側には上記羽根車の外縁部から上記環流路に至る副流路が設けられており、上記羽根車の外縁部とこの羽根車を収容したポンプ室外壁との間の上記副流路の一部をなす空間が上記外壁に形成された排気口でポンプ室外の空間に連通していることに特徴を有している。羽根車の外縁部とポンプ室外壁との間の空間を排気口を通じてポンプ室外の空間に連通させて、気体が混入した液体を吐出するための加圧された液体が位置する空間である副流路に気体があってもこれは排気口を通じて排出されるようにしたものである。加圧された液体の一部を副流路及び環流路を介して環流させて気泡を破砕する時、環流させる液体を確実に確保することができる。 The present invention in order to solve the above problems, comprises an impeller that is driven to rotate, the centrifugal pump for delivering a pressurized discharge port liquid sucked from the suction port by rotation of the impeller by centrifugal force, the blade The car is provided with a circular flow path connecting the front side and the back side of the impeller at the center thereof, and a sub flow path from the outer edge of the impeller to the circular flow path is provided on the back side of the impeller. cage, and communicates with the space of the pump outdoor at the outer portion and the exhaust port space forming part of the secondary flow channel is formed in the outer wall between the pump chamber outer wall that accommodates the impeller of the impeller It has the feature in being. A side flow that is a space in which pressurized liquid is located to discharge the liquid mixed with gas by communicating the space between the outer edge of the impeller and the outer wall of the pump chamber to the space outside the pump chamber through the exhaust port. Even if there is gas on the road, it is exhausted through the exhaust port. When a part of the pressurized liquid is circulated through the sub-flow channel and the circular flow channel to crush the bubbles, the liquid to be circulated can be reliably ensured.

上記排気口は羽根車の底面近傍付近に一端を開口させたものであるとともに、羽根車の周方向において複数箇所に設けられていることが好ましい。   The exhaust ports are preferably open at one end near the bottom surface of the impeller and provided at a plurality of locations in the circumferential direction of the impeller.

そして本発明に係る液体供給装置は、上記の遠心ポンプを、該遠心ポンプによって送り出すべき液体を貯めているタンク内に配置していることに特徴を有している。排気口を通じて液体が漏出してもこれが問題となることはない。   The liquid supply apparatus according to the present invention is characterized in that the above centrifugal pump is disposed in a tank that stores liquid to be sent out by the centrifugal pump. This does not cause a problem if liquid leaks through the exhaust port.

本発明は、羽根車の外縁部とポンプ室外壁との間の空間をポンプ室外の空間に連通させる排気口が、加圧された液体が位置することになる空間に気体が滞留することを防ぐものであり、このために加圧された液体の一部を環流させて気泡を破砕することで、気体が混入した液体を吐出する時も、上記環流させる液体を確実に確保することができるために、運転不能に陥るようなことがないものであり、また排気口を設けることによるポンプ性能の低下は排気口として断面積の大きいものを必要としないために少しで済むものである。   In the present invention, an exhaust port that communicates the space between the outer edge of the impeller and the outer wall of the pump chamber to the space outside the pump chamber prevents gas from staying in the space where the pressurized liquid is located. For this reason, a part of the pressurized liquid is circulated to crush the bubbles, so that the liquid to be circulated can be reliably ensured even when the liquid mixed with gas is discharged. In addition, the pump performance does not become inoperable, and the deterioration of the pump performance due to the provision of the exhaust port is small because a large cross-sectional area is not required as the exhaust port.

上記排気口は羽根車の底面近傍付近に一端を開口させたものであるとともに、羽根車の周方向において複数箇所に設けられていることが、遠心ポンプの設置姿勢を問わずに排気を行うことができて好ましい。 The exhaust port has one end opened near the bottom surface of the impeller, and is provided at a plurality of locations in the circumferential direction of the impeller to exhaust regardless of the installation posture of the centrifugal pump. Is preferable .

そして本発明に係る液体供給装置は、上記の遠心ポンプを、該遠心ポンプによって送り出すべき液体を貯めているタンク内に配置しているために、加圧された液体が排気口を通じて漏出してもタンク内に戻るだけとなるために、上記漏出が問題となることはないものである。 In the liquid supply apparatus according to the present invention, the centrifugal pump is disposed in a tank that stores the liquid to be sent out by the centrifugal pump, so that even if the pressurized liquid leaks through the exhaust port. The leakage is not a problem because it only returns to the tank.

以下、本発明を添付図面に示す実施形態に基いて説明すると、図１に示すように、吸い込み口１２及び吐出口１３を備えたポンプケース１１と仕切板１６とで囲まれたポンプ室内にロータマグネット１５を備えた羽根車１４が配設されている。複数の羽根１４ａが回転中心部から外縁部まで放射状に設けられているとともに後面シュラウド１４ｂが一体となっているオープン式の図示の羽根車１４は、仕切板１６の中央に固定された軸１７に対して、カーボン入りＰＰＳ樹脂などの摺動性樹脂からなる軸受１８と、一対のスラスト軸受１９ａ，１９ｂによって軸回りに回転自在に支持されている。 Hereinafter, the present invention will be described with reference to an embodiment shown in the accompanying drawings. As shown in FIG. 1, a rotor in a pump chamber surrounded by a pump case 11 having a suction port 12 and a discharge port 13 and a partition plate 16 is provided. An impeller 14 having a magnet 15 is disposed. An open-type impeller 14 shown in the figure, in which a plurality of blades 14a are provided radially from the rotation center portion to the outer edge portion and a rear shroud 14b is integrated, is attached to a shaft 17 fixed to the center of the partition plate 16. On the other hand, the bearing 18 made of slidable resin such as carbon-containing PPS resin and the pair of thrust bearings 19a and 19b are supported so as to be rotatable about the axis.

上記仕切板１６はロータマグネット１５が設けられた羽根車１４をポンプ室に収容したポンプ部２０と、ステータ２１ａ及びステータ２１ａのコイルに電流を供給する駆動回路２１ｂとからなる磁気駆動部２１とを仕切っている。   The partition plate 16 includes a pump unit 20 that houses an impeller 14 provided with a rotor magnet 15 in a pump chamber, and a magnetic drive unit 21 that includes a stator 21a and a drive circuit 21b that supplies current to the coils of the stator 21a. Partitioning.

ここで、羽根車１４の中心部には、その羽根１４ａが設けられた表面側と裏面側（仕切板１６側）との間をつなぐ複数個の環流路２２が適宜間隔をおいて設けられている。   Here, at the center of the impeller 14, a plurality of annular flow paths 22 that connect between the front side and the back side (partition plate 16 side) on which the blades 14a are provided are provided at appropriate intervals. Yes.

磁気駆動部２１による駆動で羽根車１４が回転する時、羽根車１４の中心部が負圧となるために吸い込み口１２から液体が導入され、羽根車１４の遠心力によって羽根１４ａに沿って加圧されながら羽根車１４の外縁部へと送り出され、吐出口１３から吐出される。   When the impeller 14 is rotated by driving by the magnetic drive unit 21, a liquid is introduced from the suction port 12 because the central portion of the impeller 14 becomes negative pressure, and is applied along the blade 14 a by the centrifugal force of the impeller 14. While being pressed, it is sent to the outer edge of the impeller 14 and discharged from the discharge port 13.

この時、液体中に気体（気泡）が混入した場合、液体より比重の軽い気泡は遠心力によって回転の中心部に集まり、流量の低下で更に気泡同士が結合してより大きな気体の塊になろうとするが、羽根車１４の外縁部から羽根車１４の裏面側の副流路２４に上記加圧された液体が回り込み、上記環流路２２を通じて上記気体溜まりに噴出して気泡を粉砕する。この粉砕によって液体の流量が増加し、小さくなった気泡は液体とともに羽根車１４の外縁部に導かれる。   At this time, if gas (bubbles) is mixed in the liquid, bubbles with a specific gravity lower than that of the liquid gather at the center of rotation due to centrifugal force, and the bubbles are further combined to form a larger gas lump as the flow rate decreases. The pressured liquid flows from the outer edge of the impeller 14 into the sub-flow path 24 on the back surface side of the impeller 14, and is ejected to the gas reservoir through the annular flow path 22 to crush bubbles. This crushing increases the flow rate of the liquid, and the reduced bubbles are guided to the outer edge of the impeller 14 together with the liquid.

外縁部ではポンプケース１１内壁に羽根車１４の後面シュラウド１４ｂの液体流れ方向と同一面上に吐出口１３へ向けてなだらかな曲面で羽根車１４との間隔を広げていくボリュートが形成されて、外縁部での液体の流れは回転の法線方向において層流となっているために、気泡を含んだ液体は外縁部から上記ボリュートへ導かれて吐出口１３に向かい、流れ方向に対して９０°以上の角度を持った上記副流路２４に気泡が向かうことはない。 At the outer edge, a volute is formed on the inner wall of the pump case 11 on the same surface as the liquid flow direction of the rear shroud 14b of the impeller 14 so as to widen the gap with the impeller 14 with a gentle curved surface toward the discharge port 13. Since the liquid flow at the outer edge portion is a laminar flow in the normal direction of rotation, the liquid containing bubbles is guided from the outer edge portion to the volute and heads toward the discharge port 13, and the flow direction is 90 ° with respect to the flow direction. Bubbles do not go to the sub-channel 24 having an angle of more than 0 °.

なお、副流路２４の入り口幅は０．２ｍｍ〜０．７ｍｍ程度としておくのが好ましい。この値より狭いと副流路２４への液体の供給が阻害され、広すぎると気泡が副流路２４に侵入しやすくなる。また、副流路２４は、圧力損失を少なくするために、上記入り口部分を除けば可能な限り広くしておくことが好ましい。 In addition, it is preferable that the entrance width | variety of the subchannel 24 shall be about 0.2 mm-0.7 mm. If it is narrower than this value, the supply of liquid to the sub-channel 24 is hindered. The sub-channel 24 is preferably made as wide as possible except for the inlet portion in order to reduce pressure loss.

このように、副流路２４は気体が混入した液体を吐出するための加圧された液体を溜めておく空間ともなっているわけであるが、前述のようにこの空間にポンプ駆動前に気体が入り込むと、上記環流路２２を通じて噴出して気泡を粉砕する液体を供給できないために、いわゆるエアーロックの状態となって運転不能に陥る。   As described above, the sub-flow path 24 is also a space for storing pressurized liquid for discharging liquid mixed with gas. As described above, the gas flows into the space before the pump is driven. If it enters, since it cannot supply the liquid which spouts through the said annular flow path 22 and grind | pulverizes a bubble, it will be in the state of what is called an air lock and will be inoperable.

しかし、本発明に係る遠心ポンプにおいては、羽根車１４の外周側でポンプケーシング１１と仕切板１６との接合部となっているところに排気口２３を設けている。上記副流路２４の入り口付近とポンプケーシング１１外の空間とをつなぐ排気口２３は、副流路２４に滞留している気泡があってもこれを排出してしまうものであり、このために上記副流路２４を経て環流路２２に至る液体を確保することができるために、エアーロックを招くことなく気体が混入した液体の吐出を行うことができる。   However, in the centrifugal pump according to the present invention, the exhaust port 23 is provided at a place where the pump casing 11 and the partition plate 16 are joined on the outer peripheral side of the impeller 14. The exhaust port 23 that connects the vicinity of the entrance of the sub-channel 24 and the space outside the pump casing 11 discharges air bubbles that remain in the sub-channel 24, and therefore, Since the liquid that reaches the annular flow path 22 through the auxiliary flow path 24 can be secured, the liquid mixed with gas can be discharged without causing an air lock.

なお、上記排気口２３としては径が０．２ｍｍ〜１．０ｍｍ程度の断面積を有するものが望ましい。狭すぎると気泡が排出されず、広すぎると性能低下が大きくなる。   The exhaust port 23 preferably has a cross-sectional area with a diameter of about 0.2 mm to 1.0 mm. If it is too narrow, the bubbles will not be discharged, and if it is too wide, the performance degradation will increase.

上記排気口２３は、図２に示すように、羽根車１４のロータマグネット１５が位置する底部寄りの部分に設けたものであってもよい。また、羽根車１３の周方向におけるいくつかの場所に夫々排気口２３を設けることで、遠心ポンプの取付姿勢にかかわらず気泡排出を行うことができるものとなる。また、排気口２３を通じて加圧された液体が外部に漏出することが生じるが、この点は遠心ポンプそのものを、加圧して送り出す液体を溜めたタンク中に浸漬してしまうことで問題となるようなことがなくなる。 As shown in FIG. 2, the exhaust port 23 may be provided in a portion near the bottom where the rotor magnet 15 of the impeller 14 is located. Further, by providing the exhaust ports 23 at several locations in the circumferential direction of the impeller 13 , it is possible to discharge the bubbles regardless of the mounting posture of the centrifugal pump. Further, as the liquid pressurized through the exhaust port 23 it is caused to leak out, which this point centrifugal pump itself, a problem that would immersed in tank with sump liquid for feeding pressurized There is nothing wrong.

すなわち、図３は本発明に係る遠心ポンプ６を液冷装置に適用した場合を示しており、図中３は基板２に実装された発熱部品１を冷却液との間の熱交換で冷却する冷却器、４は冷却液から熱を取り除く放熱器、５は冷却液を貯めておくリザーブタンクであり、リザーブタンク５と冷却器３と放熱器４とは循環路７で接続しているが、上記リザーブタンク５中の冷却液中に該冷却液を冷却器３へと送り出す遠心ポンプ６を浸漬しており、遠心ポンプ６によって送り出された冷却液は、冷却器３から放熱器４を経てリザーブタンク５へと戻る。   That is, FIG. 3 shows a case where the centrifugal pump 6 according to the present invention is applied to a liquid cooling device. In FIG. 3, reference numeral 3 denotes a heat-generating component 1 mounted on the substrate 2 that is cooled by heat exchange with the coolant. The cooler 4 is a radiator that removes heat from the coolant, and 5 is a reserve tank that stores the coolant. The reserve tank 5, the cooler 3, and the radiator 4 are connected by a circulation path 7. A centrifugal pump 6 for sending the coolant to the cooler 3 is immersed in the coolant in the reserve tank 5, and the coolant sent by the centrifugal pump 6 is reserved from the cooler 3 via the radiator 4. Return to tank 5.

このように、送り出すべき冷却液中に該冷却液を送り出す遠心ポンプ６全体を配置しているために、上記排気口２３から加圧された液体（冷却液）が漏れ出ても、リザーブタンク５内に冷却液が戻るだけであるために、排気口２３による上記漏出が問題となってしまうことはない。   Thus, since the entire centrifugal pump 6 for sending out the coolant is arranged in the coolant to be sent out, even if the pressurized liquid (coolant) leaks from the exhaust port 23, the reserve tank 5 Since only the cooling liquid returns to the inside, the leakage from the exhaust port 23 does not cause a problem.

本発明の実施の形態の一例を示す断面図である。It is sectional drawing which shows an example of embodiment of this invention. 同上の他例を示す断面図である。It is sectional drawing which shows the other example same as the above. 同上の遠心ポンプを用いた液体供給装置の配管図である。It is a piping diagram of the liquid supply apparatus using the centrifugal pump same as the above.

１１ ポンプケーシング
１２ 吸い込み口
１３ 吐出口
１４ 羽根車
１６ 仕切板
２２ 環流路
２３ 排気口
２４ 副流路 11 Pump casing 12 Suction port 13 Discharge port 14 Impeller 16 Partition plate 22 Ring channel 23 Exhaust port 24 Sub channel

Claims (3)

回転駆動される羽根車を備えて、該羽根車の回転で吸い込み口から吸い込んだ液体を遠心力によって加圧して吐出口から送り出す遠心ポンプにおいて、
上記羽根車はその中心部に該羽根車の表面側と裏面側とをつなぐ環流路を備え、上記羽根車の外縁部から上記環流路に至る副流路が上記羽根車の裏面側に設けられており、
上記羽根車の外縁部とこの羽根車を収容したポンプ室外壁との間の上記副流路の一部をなす空間が上記外壁に形成された排気口でポンプ室外の空間に連通していることを特徴とする遠心ポンプ。 In a centrifugal pump that includes an impeller that is driven to rotate, pressurizes liquid sucked from a suction port by rotation of the impeller by centrifugal force, and sends the liquid from a discharge port.
The impeller is provided with a circular flow path connecting the front side and the back side of the impeller at the center thereof, and a sub-flow path extending from the outer edge of the impeller to the circular flow path is provided on the back side of the impeller. And
A space that forms a part of the sub-flow path between the outer edge of the impeller and the outer wall of the pump chamber that houses the impeller communicates with the space outside the pump chamber through an exhaust port formed in the outer wall. Centrifugal pump characterized by 上記排気口は羽根車の底面近傍付近に一端を開口させたものであるとともに、羽根車の周方向において複数箇所に設けられていることを特徴とする請求項１記載の遠心ポンプ。   The centrifugal pump according to claim 1, wherein the exhaust port has one end opened in the vicinity of the bottom surface of the impeller and is provided at a plurality of locations in the circumferential direction of the impeller. 請求項１または請求項２に記載の遠心ポンプが、該遠心ポンプによって送り出すべき液体を貯めているタンク内に配置されていることを特徴とする液体供給装置。   3. The liquid supply apparatus according to claim 1, wherein the centrifugal pump according to claim 1 or 2 is disposed in a tank that stores liquid to be delivered by the centrifugal pump.
JP2007164224A 2007-06-21 2007-06-21 Centrifugal pump and liquid supply apparatus provided with the same Expired - Fee Related JP4858329B2 (en)

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