WO2023101030A1 - Pompe - Google Patents

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Publication number
WO2023101030A1
WO2023101030A1 PCT/JP2022/044661 JP2022044661W WO2023101030A1 WO 2023101030 A1 WO2023101030 A1 WO 2023101030A1 JP 2022044661 W JP2022044661 W JP 2022044661W WO 2023101030 A1 WO2023101030 A1 WO 2023101030A1
Authority
WO
WIPO (PCT)
Prior art keywords
impeller
pump
tongues
volute
casing
Prior art date
Application number
PCT/JP2022/044661
Other languages
English (en)
Japanese (ja)
Inventor
拓士 池田
Original Assignee
株式会社荏原製作所
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 株式会社荏原製作所 filed Critical 株式会社荏原製作所
Publication of WO2023101030A1 publication Critical patent/WO2023101030A1/fr

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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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers

Definitions

  • the present invention relates to a pump for transferring liquid, and more particularly to a volute pump that does not have a rotating shaft connected to an impeller.
  • the pump In the fields of precision equipment and medical equipment, there is a demand for miniaturization of pumps used to transfer liquids.
  • the pump has a rotating shaft that connects the drive source and the impeller, and further has a bearing that supports the rotating shaft. Therefore, it is difficult to reduce the size of the pump. Therefore, a pump has been developed that does not have a rotating shaft and has a non-contact radial bearing for supporting the impeller.
  • Magnetic bearings and hydrodynamic bearings are examples of non-contact radial bearings.
  • the magnetic bearing is configured to support the impeller in a non-contact manner by magnetic force generated by applying an electric current to the coil
  • the dynamic pressure bearing is configured to support the impeller in a non-contact manner by dynamic pressure of liquid. be. Since these non-contact radial bearings do not involve physical sliding, they can extend the life of the pump, suppress heat generation, and prevent particles from entering the liquid.
  • the present invention provides a pump that does not require a mechanical radial bearing for receiving the radial load of the impeller.
  • a pump for transferring a liquid comprises a casing having a volute chamber therein and an impeller disposed within said volute chamber, said casing being evenly spaced around said impeller. and at least three side walls respectively connected to said at least three tongues, said at least three side walls forming at least three flow paths for said liquid. , each of said at least three side walls having a volute side surface extending from one of said at least three tongues to a position beyond an adjacent other tongue, said pump supporting said impeller; A pump is provided that does not have radial bearings for
  • a pump for transferring a liquid comprises a casing having a volute chamber therein and an impeller disposed within said volute chamber, said casing being evenly spaced around said impeller. and at least three side walls respectively connected to said at least three tongues, said at least three side walls forming at least three flow paths for said liquid. , each of said at least three sidewalls having a volute side extending from one of said at least three tongues to a position beyond an adjacent other tongue, upstream of said at least three tongues; A pump is provided wherein the radial load of said impeller is supported by at least three pressure maxima occurring at .
  • a pump for transferring a liquid comprises a casing having a volute chamber therein and an impeller disposed within said volute chamber, said casing being evenly spaced around said impeller. and at least three side walls respectively connected to said at least three tongues, said at least three side walls forming at least three flow paths for said liquid. , each of said at least three sidewalls having a volute side extending from one of said at least three tongues to a position beyond an adjacent other tongue, upstream of said at least three tongues; A pump is provided wherein substantially all of the radial load of said impeller is supported by at least three pressure maxima occurring at .
  • said at least three tongues have the same shape. In one aspect, the at least three tongues are arranged rotationally symmetrical about the center of the volute chamber. In one aspect, the volute sides of the at least three sidewalls have the same shape. In one aspect, the volute sides of the at least three sidewalls are arranged rotationally symmetrical about the center of the volute chamber. In one aspect, the inlets of the at least three channels are arranged rotationally symmetrically about the center of the volute chamber. In one aspect, the at least three channels have different lengths and different widths, the longer the length of each channel, the greater the width of each channel. In one aspect, the pump further comprises a pivot bearing located between the back surface of the impeller and the inner surface of the casing. In one aspect, the pump further comprises a non-contact thrust bearing located on the suction side of the impeller.
  • a pump apparatus comprising the pump described above and a motor stator configured to generate a rotating magnetic field.
  • the pressure of the liquid is locally increased on the upstream side of the at least three tongues arranged around the impeller. That is, at least three pressure maximum points are generated at equal intervals around the impeller. These pressure maxima can support the radial loads of the impeller. Therefore, the radial bearing itself for receiving the radial load of the impeller is no longer required, and the miniaturization of the pump, which could not be achieved conventionally, is realized.
  • FIG. 1 is a cross-sectional view of an embodiment of a pumping device
  • FIG. 2 is a horizontal sectional view of the pump shown in FIG. 1
  • FIG. Figure 3 shows the casing shown in Figure 2; It is a figure explaining the 1st volute side.
  • FIG. 10 is a cross-sectional view showing another embodiment of a pump device
  • FIG. 1 is a cross-sectional view showing one embodiment of a pump device.
  • the pump device comprises a pump 1 for transferring liquid and a motor stator 2 for driving the pump 1 .
  • the pump 1 comprises a casing 6 having a volute chamber 5 therein, and an impeller 7 arranged within the volute chamber 5 .
  • the impeller 7 is provided with a plurality of permanent magnets 10. These permanent magnets 10 are embedded in the impeller 7 and are not exposed on the surface of the impeller 7 .
  • the motor stator 2 comprises a plurality of coils 12 and power lines 15 for supplying current to these coils 12 . When current (more specifically, three-phase AC current) is supplied to the coil 12, the motor stator 2 generates a rotating magnetic field. This rotating magnetic field acts on the permanent magnet 10 of the impeller 7 to rotate the impeller 7 . A gap is formed between the pump 1 and the motor stator 2 so that the pump 1 can be separated from the motor stator 2 . Pump 1 may be fixed to motor stator 2 via a bracket (not shown).
  • the casing 6 has a liquid suction port 18 .
  • the impeller 7 rotates, the liquid flows into the pump 1 through the suction port 18 , is pressurized by the rotation of the impeller 7 , and is discharged from the pump 1 .
  • liquids to be transferred by the pump 1 of the present embodiment include pure water, blood, and chemical solutions, but are not limited to these.
  • the impeller 7 is completely non-contact supported, so particles and frictional heat due to sliding are not generated. Therefore, the pump 1 is suitable for transporting pure water of extremely high purity and blood that requires a constant temperature.
  • FIG. 2 is a horizontal sectional view of the pump 1 shown in FIG.
  • the impeller 7 is arranged inside the volute chamber 5 .
  • Such a pump 1 is also called a volute pump.
  • the impeller 7 has a plurality of blades 8 .
  • the entire impeller 7 is circular.
  • the casing 6 has three tongues 21A, 21B, 21C arranged at regular intervals around the impeller 7 and three side walls 22A, 22B, 22C connected to the tongues 21A, 21B, 21C, respectively. are doing.
  • the three side walls 22A, 22B, 22C form three channels 23A, 23B, 23C for the liquid to be transported.
  • the configuration of the pump 1 is Not limited to this embodiment, four or more tongues, sidewalls and channels may be provided.
  • the liquid flows from the suction port 18 (see FIG. 1), flows through the impeller 7, and is pressurized as the impeller 7 rotates.
  • the pressurized liquid flows through the three channels 23A, 23B, 23C.
  • the channels 23A, 23B, 23C communicate with the volute chamber 5, and inlets 26A, 26B, 26C of the channels 23A, 23B, 23C face the volute chamber 5.
  • the liquid separately flows through the three flow paths 23A, 23B, 23C and is discharged outside through the three outlets 27A, 27B, 27C of the three flow paths 23A, 23B, 23C.
  • the liquid outlets 27A, 27B, 27C are separately provided corresponding to the three flow paths 23A, 23B, 23C.
  • FIG. 3 is a diagram showing the casing 6 shown in FIG.
  • the three sidewalls 22A, 22B, 22C have volute sides 30A, 30B, 30C, respectively, each of the volute sides 30A, 30B, 30C extending from one of the three tongues 21A, 21B, 21C. , extending beyond the other adjacent tongue. That is, the first sidewall 22A has a first volute side surface 30A extending from the first tongue 21A to which the first sidewall 22A is connected to a position beyond the adjacent second tongue 21B.
  • the second side wall 22B has a second volute side 30B extending from the second tongue 21B to which the second side wall 22B is connected to a position beyond the adjacent third tongue 21C.
  • the third side wall 22C has a third volute side 30C extending from the third tongue 21C to which the third side wall 22C is connected to a position beyond the adjacent first tongue 21A.
  • FIG. 4 is an enlarged view showing the first volute side surface 30A.
  • the start point S of the first volute side surface 30A is located at the connection point between the first tongue portion 21A and the side wall 22A, and the end point E of the first volute side surface 30A is located at the circumference of the impeller 7. directionally beyond the adjacent second tongue 21B.
  • a first inlet 26A is formed between the first volute side 30A and the second tongue 21B.
  • the second volute side surface 30B and the third volute side surface 30C have the same configuration as the first volute side surface 30A.
  • volute side surfaces 30A, 30B, 30C are formed from the inner surfaces of the upstream side portions of the side walls 22A, 22B, 22C and face the volute chamber 5.
  • the volute sides 30A, 30B, 30C form at least part of the volute chamber 5.
  • the impeller 7 is surrounded by these volute side surfaces 30A, 30B, 30C.
  • the three tongues 21A, 21B, 21C have the same shape.
  • the volute sides 30A, 30B, 30C of the three sidewalls 22A, 22B, 22C have the same length. Furthermore, the volute sides 30A, 30B, 30C have the same shape.
  • the term "same" not only means exactly the same, but also serves the intended purpose of creating a uniform pressure maximum around the impeller 7 to support the radial load of the impeller 7. It also means substantially the same, so far as achievable.
  • the tongues 21A, 21B, and 21C are arranged rotationally symmetrically with respect to the center O of the volute chamber 5. That is, when the tongue 21A is rotated about the center O of the volute chamber 5 by an angle, the tongue 21A overlaps the tongue 21B, and the tongue 21A is rotated about the center O of the volute chamber 5 by an angle. Then, the tongue portion 21A overlaps the tongue portion 21C.
  • the volute side surfaces 30A, 30B, and 30C are also arranged rotationally symmetrically with respect to the center O of the volute chamber 5.
  • Inlets 26A, 26B, 26C of the flow paths 23A, 23B, 23C are arranged at regular intervals around the center O of the volute chamber 5 and have the same shape. Further, these three inlets 26A, 26B, 26C are arranged rotationally symmetrically with respect to the center O of the volute chamber 5. As shown in FIG.
  • a mechanical radial bearing for supporting the impeller 7 is provided. This eliminates the need for the pump 1 and realizes the miniaturization of the pump 1, which could not be achieved in the past.
  • the pump 1 does not have a mechanical radial bearing for supporting the impeller 7, so the pump 1 can be made very thin.
  • the lengths of the three flow paths 23A, 23B, and 23C are different.
  • the width of the channels may increase along with the length of the channels. That is, the longest first flow path 23A has the greatest width, the second longest second flow path 23B has a smaller width than the first flow path 23A, and the shortest third flow path 23B has a smaller width than the first flow path 23A.
  • Channel 23C has a smaller width than second channel 23B.
  • Such a flow channel shape is expected to contribute to the uniformity of the maximum pressure points R generated upstream of the three tongues 21A, 21B, and 21C.
  • the pump 1 further comprises a pivot bearing 45 arranged between the back surface of the impeller 7 and the inner surface of the casing 6, as shown in FIG.
  • the pivot bearing 45 is composed of a spherical body that is a separate structure from the impeller 7 and the casing 6 .
  • a first recessed portion 41 is provided on the rear surface of the impeller 7
  • a second recessed portion 42 facing the first recessed portion 41 is provided on the inner surface of the casing 6 .
  • a spherical pivot bearing 45 is arranged between the first recess 41 and the second recess 42 , and positioning of the pivot bearing 45 is achieved by the first recess 41 and the second recess 42 .
  • the pivot bearing 45 functions when the impeller 7 is started. More specifically, when the motor stator 2 generates a rotating magnetic field, the impeller 7 is drawn toward the motor stator 2 .
  • the pivot bearing 45 supports the load of the impeller 7 toward the motor stator 2 and prevents the entire back surface of the impeller 7 from coming into contact with the inner surface of the casing 6 (surface contact). Since the impeller 7 can rotate around the pivot bearing 45, the impeller 7 can smoothly start its rotation.
  • the pivot bearing 45 may be a protrusion protruding from the back surface of the impeller 7.
  • pivot bearing 45 may be a curved or conical protrusion protruding from the back surface of impeller 7 .
  • the pump 1 includes a non-contact thrust bearing 50 arranged on the suction side of the impeller 7 to receive the thrust load described above.
  • the non-contact thrust bearing 50 is a hydrodynamic bearing. More specifically, a spiral groove 51 is formed on the surface of the impeller 7 on the suction side, and the spiral groove 51 generates dynamic pressure of the liquid when the impeller 7 rotates. The thrust load of the impeller 7 is received by the dynamic pressure of this liquid.
  • the non-contact thrust bearing 50 may be a magnetic bearing.
  • magnetic bearings using permanent magnets may be provided.
  • a hydrodynamic bearing as shown in FIG. 1 is more suitable.
  • FIG. 5 is a cross-sectional view showing another embodiment of the pump device.
  • the configuration and operation of this embodiment, which are not specifically described, are the same as those of the embodiment described with reference to FIGS. 1 to 4, so redundant description thereof is omitted.
  • the impeller 7 of the pump 1 of this embodiment has a return channel 60 formed at its center. This return channel 60 penetrates the impeller 7 in its axial direction.
  • the pump 1 according to the embodiment shown in FIG. 5 is suitable for transporting blood.
  • the present invention can be used for volute pumps that do not have a rotating shaft connected to an impeller.

Abstract

La présente invention concerne une pompe à volute qui ne comporte pas d'arbre rotatif couplé à un impulseur. Un carter (6) d'une pompe (1) comprend : au moins trois parties languettes (21A, 21B, 21C) disposées à intervalles égaux autour d'un impulseur (7) ; et au moins trois parois latérales (22A, 22B, 22C) reliées respectivement aux parties languettes (21A, 21B, 21C). Les parois latérales (22A, 22B, 22C) forment au moins trois passages d'écoulement (23A, 23B, 23C) pour un fluide. Chacune des parois latérales (22A, 22B, 22C) présente une surface latérale de volute (30A, 30B, 30C) qui s'étend à partir d'une des parties languettes (21A, 21B, 21C) jusqu'à une position au-delà d'une autre partie languette adjacente. La pompe (1) ne comporte pas de palier radial pour supporter l'impulseur (7).
PCT/JP2022/044661 2021-12-03 2022-12-05 Pompe WO2023101030A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021196687A JP2023082774A (ja) 2021-12-03 2021-12-03 ポンプ
JP2021-196687 2021-12-03

Publications (1)

Publication Number Publication Date
WO2023101030A1 true WO2023101030A1 (fr) 2023-06-08

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PCT/JP2022/044661 WO2023101030A1 (fr) 2021-12-03 2022-12-05 Pompe

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JP (1) JP2023082774A (fr)
WO (1) WO2023101030A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003097491A (ja) * 2001-09-26 2003-04-03 Mitsubishi Heavy Ind Ltd 立軸単段ポンプ
JP2004144070A (ja) * 2002-08-30 2004-05-20 Senko Medical Instr Mfg Co Ltd 遠心ポンプ
JP2005270415A (ja) * 2004-03-25 2005-10-06 Terumo Corp 遠心式血液ポンプ装置
JP2007044302A (ja) * 2005-08-10 2007-02-22 Tokyo Medical & Dental Univ 遠心ポンプの流量及び揚程測定方法、装置、及び、拍動する循環系の循環状態評価装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003097491A (ja) * 2001-09-26 2003-04-03 Mitsubishi Heavy Ind Ltd 立軸単段ポンプ
JP2004144070A (ja) * 2002-08-30 2004-05-20 Senko Medical Instr Mfg Co Ltd 遠心ポンプ
JP2005270415A (ja) * 2004-03-25 2005-10-06 Terumo Corp 遠心式血液ポンプ装置
JP2007044302A (ja) * 2005-08-10 2007-02-22 Tokyo Medical & Dental Univ 遠心ポンプの流量及び揚程測定方法、装置、及び、拍動する循環系の循環状態評価装置

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