JP2003343490A - Centrifugal pump and casing design method therefor - Google Patents
Centrifugal pump and casing design method thereforInfo
- Publication number
- JP2003343490A JP2003343490A JP2002149666A JP2002149666A JP2003343490A JP 2003343490 A JP2003343490 A JP 2003343490A JP 2002149666 A JP2002149666 A JP 2002149666A JP 2002149666 A JP2002149666 A JP 2002149666A JP 2003343490 A JP2003343490 A JP 2003343490A
- Authority
- JP
- Japan
- Prior art keywords
- casing
- peripheral surface
- pump
- outer peripheral
- centrifugal pump
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、遠心ポンプ及び遠
心ポンプのケーシング設計方法に関する。TECHNICAL FIELD The present invention relates to a centrifugal pump and a method for designing a casing of the centrifugal pump.
【０００２】[0002]
【従来の技術】遠心ポンプとして、例えば特開平10-015
056号公報に記載されている遠心ポンプがある。この遠
心ポンプは、駆動部の端部から延びる回転軸にポンプ翼
の翼ボスが連結し、駆動部の端部に、ポンプ翼を覆うケ
ーシングが接続して流体室が形成されている。ケーシン
グには、回転軸の軸線方向を向く側に流体を流体室内に
導く流入口が設けられ、ケーシングの側部にポンプ翼に
より遠心力が加速された流体を吐出する流出口が設けら
れているオープンインペラ形式の遠心ポンプであり、ポ
ンプ翼の回転によって流入口から流出口に向かう流体流
れを発生させ、流入口から流出口に所定流量の流体を送
り出すようになっている。2. Description of the Related Art As a centrifugal pump, for example, Japanese Patent Laid-Open No. 10-015
There is a centrifugal pump described in 056. In this centrifugal pump, a blade boss of a pump blade is connected to a rotating shaft extending from the end of the drive unit, and a casing covering the pump blade is connected to the end of the drive unit to form a fluid chamber. The casing is provided with an inlet for guiding the fluid into the fluid chamber on the side facing the axial direction of the rotating shaft, and an outlet for discharging the fluid whose centrifugal force is accelerated by the pump vanes is provided on the side of the casing. This is an open-impeller type centrifugal pump, which is configured to generate a fluid flow from an inflow port to an outflow port by rotation of a pump blade, and send out a predetermined amount of fluid from the inflow port to the outflow port.
【０００３】[0003]
【発明が解決しようとする課題】しかし、特開平10-015
056号公報の遠心ポンプは、小型化を優先するため、ポ
ンプ翼とケーシングの内壁とのクリアランスを一定にし
ているので、ポンプ翼で発生した速度エネルギが圧力エ
ネルギにスムーズに変換できず、ポンプ効率が低下する
という課題があった。[Problems to be Solved by the Invention] However, JP-A-10-015
In the centrifugal pump disclosed in Japanese Patent No. 056, since the clearance between the pump blade and the inner wall of the casing is made constant in order to prioritize miniaturization, the velocity energy generated in the pump blade cannot be smoothly converted into pressure energy, which results in pump efficiency. However, there was a problem that
【０００４】そこで、特開平09-313600号公報には、流
体室を渦巻き室とし、インペラで発生した速度エネルギ
を圧力エネルギにスムーズに変換し、ポンプ効率を向上
させる遠心ポンプが開示されている。しかし、特開平09
-313600号公報の技術は、ケーシングの肉厚が大きく軽
量化の面で問題があるとともに、ケーシング外径も大き
いので、ポンプ全体が大型になってしまうおそれがあ
る。Therefore, Japanese Patent Laid-Open No. 09-313600 discloses a centrifugal pump in which a fluid chamber is a swirl chamber and velocity energy generated by an impeller is smoothly converted into pressure energy to improve pump efficiency. However, JP-A-09
The technique of Japanese Laid-Open Patent Publication No. 313600 has a problem in that the thickness of the casing is large and the weight is reduced, and since the casing outer diameter is large, the entire pump may be large.
【０００５】本発明は上記事情に鑑みてなされたもので
あり、ポンプ効率を向上させるとともに、軽量化及び小
型化を図ることができる遠心ポンプ及び遠心ポンプのケ
ーシング設計方法を提供することを目的としている。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a centrifugal pump and a method of designing a casing of the centrifugal pump, which can improve the pump efficiency and can reduce the weight and size. There is.
【０００６】[0006]
【課題を解決するための手段】本発明に係る請求項１記
載の遠心ポンプは、回転駆動部に連結している回転軸
と、この回転軸が貫通する貫通孔を設けたポンプ基部
と、前記回転軸の先端に翼ボスが連結し、前記回転駆動
部の駆動により前記回転軸とともに回転するポンプ翼
と、このポンプ翼を覆うように前記ポンプ基部に接続し
て流体室を画成するケーシングと、前記ケーシングの所
定位置に設けた流体流入口と、前記ケーシングの所定位
置に設けた流体流出口とを備えた遠心ポンプにおいて、
前記流体室として、前記ポンプ翼の外周端面に対面する
前記ケーシングの内周壁に、前記回転軸の軸芯を中心に
渦巻き室を設け、前記ポンプ基部に接続する前記ケーシ
ングの端部の外周面及び内周面を円形状で形成し、且
つ、それら外周面及び内周面の円中心を一致させるとと
もに、前記円中心を、前記回転軸の軸芯に対して前記渦
巻き室の終了点側に偏心した位置に設定した。According to a first aspect of the present invention, there is provided a centrifugal pump according to a first aspect of the present invention, a rotary shaft connected to a rotary drive unit, a pump base having a through hole through which the rotary shaft passes, A vane boss is connected to the tip of the rotary shaft, the pump vane rotates together with the rotary shaft by the drive of the rotary drive unit, and a casing that connects to the pump base so as to cover the pump vane and defines a fluid chamber. A centrifugal pump having a fluid inlet provided at a predetermined position of the casing and a fluid outlet provided at a predetermined position of the casing,
As the fluid chamber, on the inner peripheral wall of the casing facing the outer peripheral end surface of the pump blade, a spiral chamber is provided around the axis of the rotating shaft, and the outer peripheral surface of the end portion of the casing connected to the pump base and The inner peripheral surface is formed in a circular shape, and the circular centers of the outer peripheral surface and the inner peripheral surface are aligned with each other, and the circular center is eccentric to the end point side of the spiral chamber with respect to the axis of the rotating shaft. Set to the position.
【０００７】また、請求項２記載の発明は、請求項１記
載の遠心ポンプにおいて、前記流体室を流れる流体を血
液とした。一方、請求項３記載の発明は、請求項１及び
２に記載の遠心ポンプのケーシングを設計する方法であ
って、前記ポンプ基部に接続する前記ケーシングの端部
の外周面及び内周面の円中心を一致させ、前記回転軸の
軸芯に対して前記渦巻き室の終了点側に偏心させる際
に、前記外周面及び前記内周面の間の肉厚が最適な寸法
となるように、前記円中心の偏心位置と、外周面及び内
周面の径を決定している。According to a second aspect of the invention, in the centrifugal pump according to the first aspect, the fluid flowing through the fluid chamber is blood. On the other hand, the invention according to claim 3 is a method for designing the casing of the centrifugal pump according to claims 1 and 2, wherein the outer peripheral surface and the inner peripheral surface of the end portion of the casing connected to the pump base are circled. When the centers are aligned and the center of the rotary shaft is eccentric to the end point side of the spiral chamber with respect to the axis, the wall thickness between the outer peripheral surface and the inner peripheral surface becomes an optimal dimension. The eccentric position of the center of the circle and the diameters of the outer peripheral surface and the inner peripheral surface are determined.
【０００８】また、請求項４記載の発明は、請求項３記
載の遠心ポンプのケーシング設計方法において、前記回
転軸の軸芯と前記渦巻き室の終了点との間を結ぶ仮想線
を引き、前記回転軸の軸芯を中心として前記仮想線を境
界とした９０°未満の角度の範囲内に、前記ケーシング
の外周面及び内周面の円中心を設けている。また、請求
項５記載の発明は、請求項４記載の遠心ポンプのケーシ
ング設計方法において、前記回転軸の軸芯を中心として
前記仮想線を境界とした４５°の角度の範囲内に、前記
ケーシングの外周面及び内周面の円中心を設けている。According to a fourth aspect of the present invention, in the method for designing the casing of the centrifugal pump according to the third aspect, an imaginary line connecting the axis of the rotary shaft and the end point of the spiral chamber is drawn, Circle centers of the outer peripheral surface and the inner peripheral surface of the casing are provided within a range of an angle of less than 90 ° with the imaginary line as a boundary around the axis of the rotating shaft. According to a fifth aspect of the present invention, in the method for designing the casing of the centrifugal pump according to the fourth aspect, the casing is provided within a range of an angle of 45 ° with the virtual line as a boundary around the axis of the rotary shaft. The outer circumferential surface and the inner circumferential surface of the circle center are provided.
【０００９】さらに、請求項６記載の発明は、請求項５
記載の遠心ポンプのケーシング設計方法において、前記
仮想線上に、前記ケーシングの外周面及び内周面の円中
心を設けている。Further, the invention according to claim 6 is the same as claim 5
In the method of designing a casing of a centrifugal pump described above, circle centers of an outer peripheral surface and an inner peripheral surface of the casing are provided on the virtual line.
【００１０】[0010]
【発明の実施の形態】以下、本発明に係る遠心ポンプの
実施形態について図面を参照して説明する。図１は、血
液ポンプとして使用される遠心ポンプの軸方向断面を示
すものである。この図の符号２は、駆動部４に内蔵した
ロータ（図示せず）に接続している回転軸である。この
回転軸２はポンプ基部６を通過し、その先端が複数のポ
ンプ翼８の基端部に設けた翼ボス８ａにネジ締結によっ
て接続されている。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a centrifugal pump according to the present invention will be described below with reference to the drawings. FIG. 1 shows an axial cross section of a centrifugal pump used as a blood pump. Reference numeral 2 in this figure is a rotary shaft connected to a rotor (not shown) built in the drive unit 4. The rotary shaft 2 passes through a pump base portion 6, and its tip is connected to a blade boss 8a provided at the base end portion of a plurality of pump blades 8 by screw fastening.
【００１１】ポンプ基部６の端面には複数のポンプ翼８
を覆うようにケーシング１０が接続して流路Ｓが形成さ
れており、ケーシング１０の回転軸２の軸線方向を向く
側には、流体（血液）を流路Ｓ内に導く流入口１０ａが
設けられ、ケーシング１０の側部に、ポンプ翼８により
加速された流体を吐出する流出口１０ｂが開口し、流出
管１１と接続している。A plurality of pump blades 8 are provided on the end surface of the pump base 6.
The casing 10 is connected so as to cover the flow passage S, and a flow passage S is formed on the side of the casing 10 facing the axial direction of the rotating shaft 2 to introduce a fluid (blood) into the flow passage S. The outlet 10 b for discharging the fluid accelerated by the pump blade 8 is opened at the side of the casing 10 and is connected to the outflow pipe 11.
【００１２】回転軸２は、軸受けロータ１２と、この軸
受けロータ１２に回転自在に外嵌している円筒形状の軸
受けステータ１４からなるスベリ軸受けでポンプ基部６
に支持されている。なお、軸受けロータ１２の外周面及
び軸受けステータ１４の内周面とは、極薄い流体の潤滑
膜を介して摺接している。また、ポンプ基部６及び翼ボ
ス８ａの間には、流路Ｓ内の流体が回転軸２側へ漏れる
のを防止するメカニカルシール１６が設けられており、
駆動部４及びポンプ基部６の互いに対向する端面に配置
した同極の環状磁石２０ａ、２０ｂの反発力によってメ
カニカルシール１６に密着力が作用している。The rotary shaft 2 is a sliding bearing composed of a bearing rotor 12 and a cylindrical bearing stator 14 rotatably fitted on the bearing rotor 12, and is a pump base portion 6.
Supported by. The outer peripheral surface of the bearing rotor 12 and the inner peripheral surface of the bearing stator 14 are in sliding contact with each other through an extremely thin fluid lubricating film. A mechanical seal 16 is provided between the pump base 6 and the blade boss 8a to prevent the fluid in the flow path S from leaking to the rotating shaft 2 side.
Adhesive force acts on the mechanical seal 16 by the repulsive force of the annular magnets 20a and 20b of the same pole arranged on the end faces of the drive unit 4 and the pump base unit 6 facing each other.
【００１３】ここで、ポンプ翼８の外周端面に対面して
いるケーシング１０の内周側部には、流体室としての渦
巻き室２２が形成されている。図２は、ケーシング１０
のポンプ基部６に当接する側を示した図である。この図
から明らかなように、渦巻き室２２は、回転軸２の軸芯
Ｐ１を中心として、例えばアルキメデスのうずまき線の
方程式に基づいて形成されている。この渦巻き室２２を
形成している内壁は、図２に示すように、渦巻き開始点
Ａ１から矢印方向の円周方向に向かうに従い、徐々に内
径Ｄａが大きくなって室内の軸方向に直交する断面積が
増大していき、ポンプ基部６の端面に当接する当接面１
０ｃに向かってアンモナイト状に連続している。そし
て、流出口１０ｂ近くである渦巻き終了点Ａ２の内壁
が、最大の内径Ｄmaxとなって最大の室内の断面積（軸
方向に直交する室内の断面積）を有している。なお、渦
巻き終了点Ａ２の内壁の内径Ｄmaxを、渦巻き室２２の
最大内径Ｄmaxと称する。Here, a spiral chamber 22 as a fluid chamber is formed on the inner peripheral side of the casing 10 facing the outer peripheral end surface of the pump blade 8. FIG. 2 shows the casing 10.
It is the figure which showed the side which contacts the pump base part 6. As is apparent from this figure, the spiral chamber 22 is formed around the axis P1 of the rotary shaft 2 based on, for example, the Archimedes's spiral line equation. As shown in FIG. 2, the inner wall forming the spiral chamber 22 gradually increases in inner diameter Da as it goes from the spiral start point A1 in the circumferential direction of the arrow, so that the inner wall of the inner wall of the spiral chamber 22 is orthogonal to the axial direction. The contact surface 1 that contacts the end surface of the pump base 6 as the area increases
It continues in the form of ammonite toward 0c. The inner wall of the spiral end point A2 near the outlet 10b has the maximum inner diameter Dmax and has the maximum inner cross-sectional area (the inner cross-sectional area orthogonal to the axial direction). The inner diameter Dmax of the inner wall of the spiral end point A2 is referred to as the maximum inner diameter Dmax of the spiral chamber 22.
【００１４】また、当接面１０ｃの内周側は、渦巻き室
２２の渦巻き終了点Ａ２の内壁に連続しており、渦巻き
室２２の最大内径Ｄmaxより僅かに大きな寸法の直径ｄ
１で曲面状に削り取られ、ポンプ基部６を嵌め込む際の
嵌め込み面１０ｄとして形成されている。ここで、この
嵌め込み面１０ｄの直径ｄ１の中心は、回転軸２の軸芯
Ｐ１に対して渦巻き終了点Ａ２側に偏心している芯Ｐ２
の位置である。また、ケーシング１０の当接面１０ｃ側
の外周は、前記芯Ｐ２を中心とした直径ｄ２で円形状と
なるように形成されている。The inner peripheral side of the contact surface 10c is continuous with the inner wall of the spiral end point A2 of the spiral chamber 22 and has a diameter d slightly larger than the maximum inner diameter Dmax of the spiral chamber 22.
It is scraped off into a curved surface at 1 and is formed as a fitting surface 10d when the pump base 6 is fitted. Here, the center of the diameter d1 of the fitting surface 10d is eccentric to the spiral end point A2 side with respect to the axis P1 of the rotating shaft 2.
Is the position. Further, the outer periphery of the casing 10 on the contact surface 10c side is formed to have a circular shape with a diameter d2 centered on the core P2.
【００１５】このように、嵌め込み面１０ｄの中心と、
ケーシング１０の当接面１０ｃ側の外周面の中心は、回
転軸２の軸芯Ｐ１に一致しておらず、渦巻き室２２に外
接する円を想定し、その円の芯（回転軸２の軸芯Ｐ１に
対して渦巻き終了点Ａ２側に偏心した芯Ｐ２）に一致さ
せている。これにより、小さな室内の断面積を有してい
る渦巻き室２２の開始側（流入口１０ａに寄った側）の
ケーシング１０の肉厚ｈ１も、大きな室内の断面積を有
している渦巻き室２２の終了側（当接面１０ｃに寄った
側）のケーシング１０の肉厚ｈ２も、略同一の寸法とな
る。Thus, the center of the fitting surface 10d,
The center of the outer peripheral surface of the casing 10 on the side of the contact surface 10c does not coincide with the axis P1 of the rotating shaft 2 and is assumed to be a circle circumscribing the spiral chamber 22, and the center of the circle (the axis of the rotating shaft 2) It is aligned with the core P2) which is eccentric to the spiral end point A2 side with respect to the core P1. As a result, the wall thickness h1 of the casing 10 on the starting side (the side closer to the inflow port 10a) of the swirl chamber 22 having the smaller inner chamber cross-sectional area also has the larger inner chamber cross-sectional area. The thickness h2 of the casing 10 on the end side (the side closer to the contact surface 10c) has substantially the same dimension.
【００１６】ここで、図３は、本実施形態と異なるケー
シングＫの形状、すなわち、回転軸２の軸芯Ｐ１に、ケ
ーシングの外周中心と、嵌め込み面１０ｄの中心とを一
致させた場合を示すものである。この図３の形状による
と、渦巻き室２２の開始側（小さな室内の断面積を有す
る位置）のケーシングＫの肉厚ｈ１′の寸法が大きく、
渦巻き室２２の終了側（大きな室内の断面積を有する位
置）のケーシングＫの肉厚ｈ２′の寸法が小さく、局所
的に肉厚が異なるケーシング形状となる。このように、
局所的に肉厚が異なるケーシング形状になると、外部応
力が、肉厚が小さい部分に局部的に集中してケーシング
の耐久性の面で問題がある。また、ケーシングの外径が
大きくなり、軽量化、小型の面でも問題がある。Here, FIG. 3 shows a case where the shape of the casing K different from that of this embodiment, that is, the axis P1 of the rotary shaft 2 is made to coincide with the outer peripheral center of the casing and the center of the fitting surface 10d. It is a thing. According to the shape of FIG. 3, the thickness h1 ′ of the casing K on the start side of the spiral chamber 22 (the position having the small cross-sectional area in the chamber) is large,
The thickness h2 'of the casing K on the end side of the spiral chamber 22 (the position having a large cross-sectional area in the chamber) has a small thickness h2', and has a locally different thickness. in this way,
When the casing shape has a locally different wall thickness, external stress is locally concentrated on a portion having a small wall thickness, which causes a problem in terms of durability of the casing. Further, the outer diameter of the casing becomes large, and there are problems in terms of weight reduction and small size.
【００１７】ところが、図２に示したように、本実施形
態のケーシング１０は、渦巻き室２２の開始側の肉厚ｈ
１も、渦巻き室２２の終了側の肉厚ｈ２も略同一の寸法
に設定されているので、応力集中が局部的に加わらず、
耐久性が向上したケーシングを得ることができる。ま
た、本実施形態のケーシング１０は、必要以上に肉厚が
大きな箇所がなくなるので軽量化を図ることができ、し
かも、外径を小さくして小型化を図ることができるの
で、人体への植え込みが容易な小型軽量の血液ポンプを
提供することができる。However, as shown in FIG. 2, the casing 10 of this embodiment has a wall thickness h on the starting side of the spiral chamber 22.
1 and the wall thickness h2 on the end side of the spiral chamber 22 are set to substantially the same size, so stress concentration is not locally applied,
A casing with improved durability can be obtained. Further, since the casing 10 of the present embodiment does not have a portion having a wall thickness larger than necessary, the weight can be reduced, and further, the outer diameter can be reduced to reduce the size, so that the casing 10 can be implanted in a human body. It is possible to provide a small and lightweight blood pump that is easy to operate.
【００１８】さらに、上記構成の渦巻き室２２を備えた
遠心ポンプは、渦巻き室２２がポンプ翼８により与えら
れた流体の速度エネルギを圧力エネルギにスムーズに変
換するので、ポンプ効率を向上させることができる。次
に、本実施形態の遠心ポンプのケーシング１０を設計す
る手順について、図２、図４のフローチャート及び図５
から図１０を参照して説明する。Further, in the centrifugal pump provided with the swirl chamber 22 having the above structure, the swirl chamber 22 smoothly converts the velocity energy of the fluid given by the pump blades 8 into the pressure energy, so that the pump efficiency can be improved. it can. Next, regarding the procedure for designing the casing 10 of the centrifugal pump of the present embodiment, the flowcharts of FIGS. 2 and 4 and FIG.
From now on, referring to FIG.
【００１９】なお、本実施形態の渦巻き室２２は、アル
キメデスのうずまき線の方程式に基づいて形成されてい
る。また、ケーシング１０の設計を行う際には、先ず、
遠心ポンプの揚程Ｈ、流量Ｑ、回転数Ｎを設定し、比速
度ｎsを算出しておく。そして、比速度ｎsの算出に基づ
いて、ポンプ翼８の外径、基礎円直径、アルキメデスの
うずまき線の開始渦巻き角度を設定する。The spiral chamber 22 of this embodiment is formed based on the Archimedes' equation of the spiral line. When designing the casing 10, first,
The lift H, the flow rate Q, and the rotation speed N of the centrifugal pump are set, and the specific speed n s is calculated. Then, based on the calculation of the specific speed n s , the outer diameter of the pump blade 8, the basic circle diameter, and the start spiral angle of the Archimedes' spiral line are set.
【００２０】ケーシング１０を設計する手順は、先ず、
ステップＳ２において、基礎円直径、開始渦巻き角度等
に基づいて、回転軸２の軸芯Ｐ１を中心として、アルキ
メデスの渦巻き線Ｕ１を作成する（図５を参照）。次
に、ステップＳ４において、回転軸２の軸芯Ｐ１と渦巻
き終了点Ａ２との間を結ぶ仮想線Ｃ（長さがＬ）を引く
（図６参照）。The procedure for designing the casing 10 is as follows.
In step S2, a spiral line U1 of Archimedes is created around the axis P1 of the rotary shaft 2 based on the basic circle diameter, the start spiral angle, etc. (see FIG. 5). Next, in step S4, a virtual line C (having a length L) connecting the axis P1 of the rotary shaft 2 and the spiral end point A2 is drawn (see FIG. 6).
【００２１】次に、ステップＳ６において、軸芯Ｐ１か
ら離間する方向の仮想線Ｃ上に、最低限必要な肉厚Ｂの
寸法を取り、Ｂ＋Ｌを半径として軸芯Ｐ１を中心とした
基礎となる内径円Ｓ１を、渦巻き線Ｕ１の外周に作成す
る（図７参照）。次に、ステップＳ８において、軸芯Ｐ
１に対して渦巻き終了点Ａ２側にずらした（偏心した）
仮想線Ｃ上に芯Ｐ２を設け、この芯Ｐ２を中心として、
Ｂ＋Ｌを半径とした基礎となる内径円Ｓ１を作成する
（図８参照）。そして、仮想線Ｃ上の芯Ｐ２の位置をず
らし、且つ、半径を変化させることで、最低限必要な肉
厚Ｂと略同一寸法の肉厚Ｂ１を有した内径円Ｓ２の中心
位置（芯Ｐ２）と、半径を決定する（図９参照）。この
内径円Ｓ２が、前述した嵌め込み面１０ｄとなる。Next, in step S6, a minimum required thickness B is taken on the imaginary line C in the direction away from the shaft core P1 to form a base around the shaft core P1 with B + L as the radius. An inner diameter circle S1 is created on the outer circumference of the spiral U1 (see FIG. 7). Next, in step S8, the axis P
It was shifted to the spiral end point A2 side with respect to 1 (eccentric)
A core P2 is provided on the imaginary line C, and with the core P2 as the center,
A base inner diameter circle S1 having a radius of B + L is created (see FIG. 8). Then, by shifting the position of the core P2 on the imaginary line C and changing the radius, the center position (core P2 of the inner diameter circle S2 having the wall thickness B1 that is substantially the same as the minimum required wall thickness B). ), And the radius is determined (see FIG. 9). The inner diameter circle S2 becomes the fitting surface 10d described above.
【００２２】次に、ステップＳ１０において、芯Ｐ２を
中心とし、内径円Ｓ２より半径の大きな外径円Ｓ３を作
成する。この外径円Ｓ３が、前述したケーシング１０の
外周面となる。このような手順で設計を行うと、特殊な
設計を行うことなく、嵌め込み面１０ｄやケーシング外
周面等の形状を迅速、且つ容易に決定し、遠心ポンプの
小型化、軽量化が図れるようにケーシング１０の設計を
簡単に行うことができる。Next, in step S10, an outer diameter circle S3 whose center is the core P2 and whose radius is larger than that of the inner diameter circle S2 is created. The outer diameter circle S3 becomes the outer peripheral surface of the casing 10 described above. If the design is performed in such a procedure, the shapes of the fitting surface 10d and the outer peripheral surface of the casing can be quickly and easily determined without any special design, so that the centrifugal pump can be made compact and lightweight. The ten designs can be done easily.
【００２３】ここで、図１１に示すように、仮想線Ｃを
境界として９０°未満の角度の範囲内に芯Ｐ２を設ける
と、内径円Ｓ２（嵌め込み面１０ｄ）及び外径円Ｓ３
（ケーシング１０の外周面）の径を小さくすることがで
きる。また、仮想線Ｃを境界として４５°未満の角度の
範囲内に芯Ｐ２を設けると、さらに内径円Ｓ２（嵌め込
み面１０ｄ）及び外径円Ｓ３（ケーシングの外周面）の
径を小さく設定することができる。Here, as shown in FIG. 11, if the core P2 is provided within an angle range of less than 90 ° with the imaginary line C as the boundary, the inner diameter circle S2 (fitting surface 10d) and the outer diameter circle S3.
The diameter of (the outer peripheral surface of the casing 10) can be reduced. Further, when the core P2 is provided within an angle range of less than 45 ° with the virtual line C as a boundary, the diameters of the inner diameter circle S2 (fitting surface 10d) and the outer diameter circle S3 (outer peripheral surface of the casing) should be set smaller. You can
【００２４】そして、仮想線Ｃに沿って芯Ｐ２を渦巻き
終了点Ａ２側に動かしたときに、最も効果的に内径円Ｓ
２（嵌め込み面１０ｄ）及び外径円Ｓ３（ケーシングの
外周面）の径を小さくし、遠心ポンプの小型化を促進す
ることができる。なお、図３のケーシング１０設計手順
では、アルキメデスのうずまき線の方程式に基づいて渦
巻き室２２を形成したが、本発明の要旨がこれに限定さ
れるものではなく、他のうずまき線の方程式、放物うず
まき、双曲うずまき、対数うずまきの方程式に基づいて
渦巻き室を形成してもよい。Then, when the core P2 is moved to the spiral end point A2 side along the imaginary line C, the inner diameter circle S is most effective.
2 (fitting surface 10d) and the outer diameter circle S3 (outer peripheral surface of the casing) can be reduced in diameter to promote miniaturization of the centrifugal pump. In the design procedure of the casing 10 in FIG. 3, the spiral chamber 22 is formed based on the Archimedes' equation of the spiral line, but the gist of the present invention is not limited to this, and other equations of the spiral line, The swirl chamber may be formed based on the equations of object spiral, hyperbolic spiral, and logarithmic spiral.
【００２５】また、上記実施形態では、人工心臓用等に
使用される血液ポンプとした場合の作用効果について述
べたが、本発明の要旨がこれに限定されるものではな
く、他の分野においても小型軽量化を図りながらポンプ
効率を向上させることができる。Further, in the above embodiment, the operation and effect when the blood pump is used for an artificial heart or the like has been described, but the gist of the present invention is not limited to this, and may be applied to other fields. The pump efficiency can be improved while reducing the size and weight.
【００２６】[0026]
【発明の効果】以上説明したように、請求項１記載の遠
心ポンプによると、ポンプ翼を囲んでいる渦巻き室が、
ポンプ翼により与えられた流体の速度エネルギを圧力エ
ネルギにスムーズに変換するので、ポンプ効率を向上さ
せることができる。また、ケーシングの端部の外周面及
び内周面を円形状で形成し、且つそれら外周面及び内周
面の円中心を一致させ、前記円中心を、回転軸の軸芯に
対して前記渦巻き室の終了点側に偏心した位置に設定し
たことから、ケーシングには局部的に大きな肉厚部分が
少なくなり、応力集中が局部的に加わらず、耐久性が向
上したケーシングを得ることができる。As described above, according to the centrifugal pump of the first aspect, the spiral chamber surrounding the pump blade is
Since the velocity energy of the fluid given by the pump blades is smoothly converted into pressure energy, the pump efficiency can be improved. In addition, the outer peripheral surface and the inner peripheral surface of the end portion of the casing are formed in a circular shape, and the circle centers of the outer peripheral surface and the inner peripheral surface are made to coincide with each other, and the circle center is the spiral center with respect to the axis of the rotating shaft. Since the eccentric position is set to the end point side of the chamber, a locally large thickness portion is reduced in the casing, stress concentration is not locally applied, and a casing having improved durability can be obtained.
【００２７】そして、局部的に大きな肉厚部分が無くな
ることから、ケーシングの軽量化及び小型化を図ること
ができる。また、請求項２記載の遠心ポンプによると、
人体への植え込みが容易な小型軽量の血液ポンプを提供
することができる。一方、請求項３記載の遠心ポンプの
ケーシング設計方法によると、特殊な設計を行うことな
く、ポンプ基部に接続するケーシングの端部の外周面及
び内周面の間の肉厚を、迅速、且つ容易に決定すること
ができ、したがって、遠心ポンプの小型化、軽量化が図
れるようにケーシングの設計を簡単に行うことができ
る。Since the locally large wall thickness is eliminated, the weight and size of the casing can be reduced. According to the centrifugal pump of claim 2,
It is possible to provide a small and lightweight blood pump that can be easily implanted in the human body. On the other hand, according to the method for designing the casing of the centrifugal pump according to claim 3, the wall thickness between the outer peripheral surface and the inner peripheral surface of the end portion of the casing connected to the pump base can be quickly and quickly without special design. It can be easily determined, and therefore the casing can be easily designed so that the centrifugal pump can be reduced in size and weight.
【００２８】また、請求項４記載の遠心ポンプのケーシ
ング設計方法によると、回転軸の軸芯と渦巻き室の終了
点との間を結ぶ仮想線を引き、回転軸の軸芯を中心とし
て仮想線を境界とした９０°未満の角度の範囲内に、ケ
ーシングの外周面及び内周面の円中心を設けたことか
ら、ケーシングの端部の外周面内及び内周面の径が小さ
くなり、遠心ポンプの小型化を図ることができる。According to the centrifugal pump casing designing method of the present invention, an imaginary line connecting the axis of the rotary shaft and the end point of the spiral chamber is drawn, and the virtual line is centered on the axis of the rotary shaft. Since the circular centers of the outer peripheral surface and the inner peripheral surface of the casing are provided within the range of an angle of less than 90 ° with the boundary as the boundary, the diameters of the outer peripheral surface and the inner peripheral surface of the end portion of the casing are reduced, and The size of the pump can be reduced.
【００２９】また、請求項５記載の遠心ポンプのケーシ
ング設計方法によると、回転軸の軸芯を中心として前記
仮想線を境界とした４５°の角度の範囲内に、ケーシン
グの外周面及び内周面の円中心を設けたことから、さら
にケーシングの端部の外周面内及び内周面の径が小さく
なり、遠心ポンプの小型化を促進することができる。さ
らに、請求項６記載の遠心ポンプのケーシング設計方法
によると、仮想線上に、ケーシングの外周面及び内周面
の円中心を設けたことから、遠心ポンプの小型化、軽量
化が図れるように、最も効果的に外周面内及び内周面の
径を小さくすることができる。According to the method for designing a casing of a centrifugal pump according to a fifth aspect, the outer peripheral surface and the inner peripheral surface of the casing are within a range of an angle of 45 ° with the virtual line as a boundary around the axis of the rotary shaft. Since the circular center of the surface is provided, the diameters of the outer peripheral surface and the inner peripheral surface of the end portion of the casing are further reduced, and miniaturization of the centrifugal pump can be promoted. Further, according to the method for designing the casing of the centrifugal pump according to claim 6, since the circular centers of the outer peripheral surface and the inner peripheral surface of the casing are provided on the imaginary line, the centrifugal pump can be made compact and lightweight, The diameters of the inner and outer peripheral surfaces can be reduced most effectively.
【図１】本発明に係る遠心ポンプを示す軸方向断面図で
ある。FIG. 1 is an axial sectional view showing a centrifugal pump according to the present invention.
【図２】本発明の遠心ポンプを構成しているケーシング
のポンプ基部に接続する側の開口部を示す図である。FIG. 2 is a view showing an opening on a side of the casing that constitutes the centrifugal pump of the present invention, the side being connected to the pump base.
【図３】比較例として示した他のケーシングのポンプ基
部に接続すうＲ側の開口部を示す図である。FIG. 3 is a diagram showing an opening on the R side that is connected to a pump base of another casing shown as a comparative example.
【図４】本発明に係る遠心ポンプのケーシング設計手順
を示すフローチャートである。FIG. 4 is a flowchart showing a procedure for designing a casing of a centrifugal pump according to the present invention.
【図５】図４で示したケーシング設計手順におけるステ
ップＳ２の作業を具体的に示した図である。FIG. 5 is a diagram specifically showing the work of step S2 in the casing design procedure shown in FIG.
【図６】図４で示したケーシング設計手順におけるステ
ップＳ４の作業を具体的に示した図である。FIG. 6 is a diagram specifically showing the work of step S4 in the casing design procedure shown in FIG.
【図７】図４で示したケーシング設計手順におけるステ
ップＳ６の作業を具体的に示した図である。FIG. 7 is a diagram specifically showing the work of step S6 in the casing design procedure shown in FIG.
【図８】図４で示したケーシング設計手順におけるステ
ップＳ８の第１段階の作業を具体的に示した図である。FIG. 8 is a diagram specifically showing the work of the first stage of step S8 in the casing design procedure shown in FIG.
【図９】図４で示したケーシング設計手順におけるステ
ップＳ８の第２段階の作業を具体的に示した図である。FIG. 9 is a diagram specifically showing the work of the second stage of step S8 in the casing design procedure shown in FIG.
【図１０】図４で示したケーシング設計手順におけるス
テップＳ１０の作業を具体的に示した図である。FIG. 10 is a diagram specifically showing the work of step S10 in the casing design procedure shown in FIG.
【図１１】図４で示したケーシング設計手順の第１の応
用を示す図である。FIG. 11 is a diagram showing a first application of the casing design procedure shown in FIG. 4.
【図１２】図４で示したケーシング設計手順の第２の応
用を示す図である。12 is a diagram showing a second application of the casing design procedure shown in FIG. 4. FIG.
２ 回転軸
４ 駆動部（回転駆動部）
６ ポンプ基部
８ ポンプ翼
８ａ 翼ボス
１０ ケーシング
１０ａ 流入口（流体流入口）
１０ｂ 流出口（流体流出口）
１０ｃ ケーシング当接面
１０ｄ 嵌め込み面（ケーシングの端部の内周面）
１６ メカニカルシール
２２ 渦巻き室
Ａ１ 渦巻き開始点
Ａ２ 渦巻き終了点
ｄ１ 嵌め込み面の直径
ｄ２ ケーシングの外周の直径
Ｐ１ 回転軸の軸芯
Ｐ２ 嵌め込み面とケーシングの外周の円中心（ケーシ
ングの外周面及び内周面の円中心）
Ｓ２ 内径円（嵌め込み面）
Ｓ３ 外径円（ケーシングの外周面）2 rotary shaft 4 drive unit (rotation drive unit) 6 pump base 8 pump blade 8a blade boss 10 casing 10a inlet (fluid inlet) 10b outlet (fluid outlet) 10c casing contact surface 10d fitting surface (end of casing) Inner surface) 16 mechanical seal 22 swirl chamber A1 swirl start point A2 swirl end point d1 fitting surface diameter d2 casing outer diameter P1 rotary shaft axis P2 fitting surface and casing outer circle center (casing outer diameter) Circle center of outer peripheral surface and inner peripheral surface) S2 inner diameter circle (fitting surface) S3 outer diameter circle (outer peripheral surface of casing)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 北野 智哉 長野県諏訪市大和３丁目３番５号 セイコ ーエプソン株式会社内 Ｆターム(参考） 3H034 AA01 BB01 BB06 CC03 DD01 DD08 DD25 EE12 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Tomoya Kitano Seiko, 3-3-3 Yamato, Suwa City, Nagano Prefecture -In Epson Corporation F-term (reference) 3H034 AA01 BB01 BB06 CC03 DD01 DD08 DD25 EE12
Claims (6)
の回転軸が貫通する貫通孔を設けたポンプ基部と、前記
回転軸の先端に翼ボスが連結し、前記回転駆動部の駆動
により前記回転軸とともに回転するポンプ翼と、このポ
ンプ翼を覆うように前記ポンプ基部に接続して流体室を
画成するケーシングと、前記ケーシングの所定位置に設
けた流体流入口と、前記ケーシングの所定位置に設けた
流体流出口とを備えた遠心ポンプにおいて、 前記流体室として、前記ポンプ翼の外周端面に対面する
前記ケーシングの内周壁に、前記回転軸の軸芯を中心に
渦巻き室を設け、 前記ポンプ基部に接続する前記ケーシングの端部の外周
面及び内周面を円形状で形成し、且つ、それら外周面及
び内周面の円中心を一致させるとともに、前記円中心
を、前記回転軸の軸芯に対して前記渦巻き室の終了点側
に偏心した位置に設定したことを特徴とする遠心ポン
プ。1. A rotary shaft connected to a rotary drive unit, a pump base having a through hole through which the rotary shaft penetrates, and a blade boss connected to the tip of the rotary shaft to drive the rotary drive unit. A pump blade that rotates together with the rotary shaft, a casing that connects to the pump base to cover the pump blade to define a fluid chamber, a fluid inlet provided at a predetermined position of the casing, and a casing of the casing. In a centrifugal pump having a fluid outlet provided at a predetermined position, as the fluid chamber, a spiral chamber is provided around an axis of the rotating shaft on an inner peripheral wall of the casing facing an outer peripheral end surface of the pump blade. The outer peripheral surface and the inner peripheral surface of the end portion of the casing connected to the pump base portion are formed in a circular shape, and the circular center of the outer peripheral surface and the inner peripheral surface are aligned, and the circular center is rotated. Centrifugal pump, characterized in that set at a position eccentric to the end point side of the swirl chamber with the axis of the.
とを特徴とする請求項１記載の遠心ポンプ。2. The centrifugal pump according to claim 1, wherein the fluid flowing through the fluid chamber is blood.
ーシングを設計する方法であって、前記ポンプ基部に接
続する前記ケーシングの端部の外周面及び内周面の円中
心を一致させ、前記回転軸の軸芯に対して前記渦巻き室
の終了点側に偏心させる際に、前記外周面及び前記内周
面の間の肉厚が最適な寸法となるように、前記円中心の
偏心位置と、外周面及び内周面の径を決定することを特
徴とする遠心ポンプのケーシング設計方法。3. A method for designing a casing for a centrifugal pump according to claim 1, wherein the outer peripheral surface and the inner peripheral surface of an end portion of the casing connected to the pump base are made to have the same circle center. The eccentric position of the center of the circle is adjusted so that the wall thickness between the outer peripheral surface and the inner peripheral surface becomes an optimum dimension when the center of the rotary shaft is decentered toward the end point side of the spiral chamber. And a method for designing a casing for a centrifugal pump, characterized in that the diameters of the outer peripheral surface and the inner peripheral surface are determined.
点との間を結ぶ仮想線を引き、前記回転軸の軸芯を中心
として前記仮想線を境界とした９０°未満の角度の範囲
内に、前記ケーシングの外周面及び内周面の円中心を設
けることを特徴とする請求項３記載の遠心ポンプのケー
シング設計方法。4. An imaginary line connecting the axis of the rotating shaft and the end point of the spiral chamber is drawn, and an angle of less than 90 ° is defined with the imaginary line as a boundary around the axis of the rotating shaft. The casing design method for a centrifugal pump according to claim 3, wherein circle centers of the outer peripheral surface and the inner peripheral surface of the casing are provided within the range.
線を境界とした４５°の角度の範囲内に、前記ケーシン
グの外周面及び内周面の円中心を設けることを特徴とす
る請求項４記載の遠心ポンプのケーシング設計方法。5. A circular center of an outer peripheral surface and an inner peripheral surface of the casing is provided within a range of an angle of 45 ° with the virtual line as a boundary around the axis of the rotary shaft. Item 5. A method of designing a casing of a centrifugal pump according to item 4.
面及び内周面の円中心を設けることを特徴とする請求項
５記載の遠心ポンプのケーシング設計方法。6. The method for designing a casing for a centrifugal pump according to claim 5, wherein the center of a circle of the outer peripheral surface and the inner peripheral surface of the casing is provided on the imaginary line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002149666A JP4319375B2 (en) | 2002-05-23 | 2002-05-23 | Centrifugal pump casing design method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002149666A JP4319375B2 (en) | 2002-05-23 | 2002-05-23 | Centrifugal pump casing design method |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009004155A Division JP5028636B2 (en) | 2009-01-12 | 2009-01-12 | Centrifugal pump |
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| Publication Number | Publication Date |
|---|---|
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| JP4319375B2 JP4319375B2 (en) | 2009-08-26 |
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ID=29767756
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107975496A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| CN107975497A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| WO2018158838A1 (en) * | 2017-02-28 | 2018-09-07 | 株式会社サンメディカル技術研究所 | Blood pump and blood pump adjusting method |
| CN111460585A (en) * | 2020-03-06 | 2020-07-28 | 宁波方太厨具有限公司 | Volute profile generation method of centrifugal fan |
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2002
- 2002-05-23 JP JP2002149666A patent/JP4319375B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018158838A1 (en) * | 2017-02-28 | 2018-09-07 | 株式会社サンメディカル技術研究所 | Blood pump and blood pump adjusting method |
| CN110191727A (en) * | 2017-02-28 | 2019-08-30 | 株式会社太阳医疗技术研究所 | Blood pump and blood pump method of adjustment |
| US11065435B2 (en) | 2017-02-28 | 2021-07-20 | Sun Medical Technology Research Corporation | Blood pump and blood pump adjusting method |
| CN110191727B (en) * | 2017-02-28 | 2021-07-30 | 株式会社太阳医疗技术研究所 | Blood pump and blood pump adjustment method |
| CN107975496A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| CN107975497A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| CN107975497B (en) * | 2017-05-23 | 2024-04-02 | 宁波方太厨具有限公司 | Centrifugal fan spiral case |
| CN107975496B (en) * | 2017-05-23 | 2024-04-02 | 宁波方太厨具有限公司 | Centrifugal fan spiral case |
| CN111460585A (en) * | 2020-03-06 | 2020-07-28 | 宁波方太厨具有限公司 | Volute profile generation method of centrifugal fan |
| CN111460585B (en) * | 2020-03-06 | 2023-08-18 | 宁波方太厨具有限公司 | Volute molded line generation method of centrifugal fan |
| CN111523186A (en) * | 2020-05-19 | 2020-08-11 | 重庆水泵厂有限责任公司 | Method for optimizing shape of water suction chamber for double-water-suction pump |
| CN111523186B (en) * | 2020-05-19 | 2024-01-19 | 重庆水泵厂有限责任公司 | Optimization method of shape of water suction chamber for double water suction pump |
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