US20020054814A1 - Regenerative pump - Google Patents

Regenerative pump Download PDF

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Publication number
US20020054814A1
US20020054814A1 US09/939,588 US93958801A US2002054814A1 US 20020054814 A1 US20020054814 A1 US 20020054814A1 US 93958801 A US93958801 A US 93958801A US 2002054814 A1 US2002054814 A1 US 2002054814A1
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US
United States
Prior art keywords
impeller
pump
methanol
regenerative
regenerative 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.)
Abandoned
Application number
US09/939,588
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English (en)
Inventor
Bunji Honma
Nobuyasu Sadakata
Kiyoshi Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsuba Corp
Original Assignee
Mitsuba Corp
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 Mitsuba Corp filed Critical Mitsuba Corp
Assigned to MITSUBA CORPORATION reassignment MITSUBA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HASEGAWA, KIYOSHI, HONMA, BUNJI, SADAKATA, NOBUYASU
Publication of US20020054814A1 publication Critical patent/US20020054814A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/615—Filler

Definitions

  • the invention relates to ,a regenerative pump for use in a fuel supply system of a vehicle or the like. More particularly, the invention belongs to the technical field of a regenerative pump used to pump a mixed solution of water and methanol.
  • a regenerative pump of this kind having an impeller and a pump chamber, the pump chamber having the impeller rotatably mounted therein, is used for a fuel supply system of a vehicle or the like.
  • a regenerative pump for pumping fuel in a fuel tank to supply the fuel to an engine side is known.
  • Such a regenerative pump that achieves a reduction in weight by making the impeller of a thermoplastic resin material, has been proposed. Because the impeller is made to have a vane shape by forming a plurality of recesses on its outer periphery, a resin material of high strength has to be used so that such an impeller can be made with great accuracy.
  • a gap (thrust clearance) between the inner wall of the pump chamber and both side faces, in the rotary shaft direction of the impeller is set to be as small as possible while steadily maintaining the thrust clearance.
  • the impeller In the case of making the impeller of a resin, when the impeller is used for long time, there is a case such that the impeller swells due to an influence of the fuel with which the impeller is in contact. If this happens, the thrust clearance decreases and it is expected that the discharge pressure decreases and the pump locks. Consequently, as the resin material selected, the resin material must be non-hygroscopic, have high corrosion resistance, high wear-and-tear resistance, and the like to the fuel used so that the thrust clearance is maintained in a proper state for long time.
  • the regenerative pump is built by attaching an impeller, made of the phenol resin containing the reinforcement, in a pump chamber made of a metal material, such as aluminum alloy, thereby realizing lighter weight while maintaining the thrust clearance.
  • the pump chamber inner wall is made of aluminum alloy
  • the aluminum alloy is corroded by the methanol.
  • a method of surface treating the pump chamber inner wall to improve the corrosion resistance and the wear-and-tear resistance by electrolytically plating the surface of the metal material with nickel or a method of using a metal material having resistance to corrosion by methanol, such as a stainless steel, can be considered.
  • the pump chamber becomes heavy and a reduction in weight is not possible which is a problem.
  • a method of selecting a resin material having high resistance to corrosion by methanol, as the material of the pump chamber inner wall can be also considered.
  • the same resin material is used for both members, such as the impeller and the pump chamber inner wall, having a configuration such that one of the members rotates in a state where they face each other in proximity to each other, there is a fear that a seizure phenomenon may occur. It is therefore necessary to use a resin material that does not cause such a phenomenon, and this is also a problem to be solved by the invention.
  • the invention has been achieved in consideration of the circumstances to solve the problems and provides a regenerative pump including an impeller; and a pump chamber having rotatably mounted therein the impeller, wherein at least one of the impeller of the regenerative pump and an inner wall of the pump is formed by using polyphenylene sulfide so as to pump water, methanol, or a mixture solution of water and methanol.
  • the thrust clearance formed between the pump chamber inner wall and an impeller peripheral face is set so as to be assured even in a state where the impeller is swollen.
  • the high-performance regenerative pump can be maintained for a long time.
  • polyphenylene sulfide contains a filler. Consequently, the strength of the vane portion of the impeller and the reliability of the pump can be improved, and a reduction in pump efficiency, due to wear of the impeller and the pump chamber inner wall, can be suppressed.
  • FIG. 1 is a cross section showing the main inner portion of the regenerative pump, for explaining a clearance between an impeller and an inner wall;
  • FIG. 2(A) is a graph showing the relationship between a thrust clearance and a discharge flow rate of the regenerative pump and the relationship between the thrust clearance and pump efficiency when a methanol-water solution is pumped;
  • FIG. 2(B) is a graph showing the relationship between the thrust clearance and the discharge flow rate of the regenerative pump and the relationship between the thrust clearance and the pump efficiency when methanol is pumped;
  • FIG. 3 is a table showing a swelling amount and a swelling ratio when those of PF are set as “1”, as a result of impregnation tests of impellers made of resin materials.
  • reference numeral 1 denotes an impeller of a regenerative pump assembled in a fuel supply system for a methanol-water fuel.
  • a drive shaft (not shown) extending from a driving unit is externally fit to a disc-shaped center portion of the impeller 1 , and the impeller 1 rotates integrally with the drive shaft in association with the driving of the driving unit.
  • the impeller 1 of the embodiment is integrally molded of polyphenylene sulfide (PPS) selected from thermoplastic resin materials for the reasons discussed below.
  • PPS polyphenylene sulfide
  • a plurality of recesses 1 a are formed in the periphery of the impeller 1 in both faces in the axial direction, thereby creating a closed vane.
  • the impeller 1 is rotatably attached in a pump chamber P.
  • An inner wall 2 of the pump chamber P is also made of polyphenylene sulfide (PPS) similar to that of the impeller 1 for the reasons discussed below.
  • PPS polyphenylene sulfide
  • the gap and a gap R between the inner wall 2 and the peripheral face of the impeller 1 form a space in which the fuel is pressure fed in a swirl flow.
  • the inner wall 2 and both faces in the axial direction of an impeller inside diameter portion 1 b are formed so as to face each other with a narrow gap SH (the numerical value of the thrust clearance is expressed as a sum of the gaps between the inner wall 2 and the faces in the axial direction of the impeller 1 ).
  • the narrow thrust clearance SH is set to a value as will be discussed below, a regenerative pump having high pump efficiency for a long time can be constructed.
  • FIG. 2(A) is a graph showing the result of pumping the methanol-water fuel by a regenerative pump assembled in the fuel supply system.
  • measurement values of the discharge flow rate Q and the pump efficiency ⁇ P (%) with respect to various thrust clearances SH are plotted.
  • the mixture ratio (weight ratio) between methanol and water in the methanol-water fuel is set to about 1:1.
  • the discharge pressure of the regenerative pump is set to 100 kPa (kilo Pascal).
  • the solution to be pumped has relatively high viscosity like the mixture solution of methanol and water and, moreover, the discharge pressure is relatively low, in the case of pumping the solution having a low leakage loss, by setting the thrust clearance SH to 0.04 mm or less, a high discharge flow rate Q can be achieved and the pump efficiency can be maintained at nearly 15%.
  • the thrust clearance SH exceeds 0.07 mm, the discharge flow rate Q decreases sharply, and the pump efficiency decreases to 10% or lower.
  • FIG. 2(B) shows the result of pumping only methanol as the fuel by a regenerative pump assembled in the fuel supply system.
  • measurement values of the discharge flow rate Q and the pump efficiency ⁇ P (%) with respect to various thrust clearances SH are plotted.
  • the discharge pressure of the regenerative pump is set to 400 kPa (kilo Pascal).
  • the solution to be pumped has relatively low viscosity, like methanol, and the discharge pressure is relatively high, in the case of pumping the solution having a high leakage loss, by setting the thrust clearance SH to 0.02 mm or less, a high discharge flow rate Q can be achieved and a high pump efficiency can be maintained at about 25% or higher.
  • the thrust clearance SH is set to 0.04 mm or larger, the function of the regenerative pump deteriorates. It is understood that the higher the ratio of methanol in the mixture becomes and the lower the viscosity of the solution becomes, the thrust clearance SH has to be reduced.
  • thermoplastic resin material that is suitable for the material of the impeller and the inner wall of the regenerative pump for pumping the methanol-water fuel will now be addressed.
  • resin materials that are non-hygroscopic, and have high corrosion resistance and high wear-and-tear resistance with respect to methanol are, generally, polyacetal (POM), phenol resin (PF), polyethylene terephthalate (PETP), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyimide (PI), and polyamide (PA).
  • the percentage of water absorption of each of the resin materials is as follows: polyacetal (POM) 0.220 phenol resin (PF) 0.060 polyethylene terephthalate (PETP) 0.08 to 0.09 polyphenylene sulfide (PPS) 0.015 polyether ether ketone (PEEK) 0.2 polyimide (PI) 0.3 to 0.6 polyamide (PA) 0.4 to 1.3.
  • POM polyacetal
  • PETP polyethylene terephthalate
  • PPS polyphenylene sulfide
  • PEEK polyether ether ketone
  • PI polyimide
  • PA polyamide
  • Impregnation tests of the resin materials of PPS, PF, and POM, which are regarded as materials suitable for the methanol-water fuel, using methanol, water, and a mixture solution of methanol and water were conducted to measure the swelling ratio of each of the resin materials in each of the solutions.
  • impellers having a thickness of Smm made of the resin materials of PPS, PF, and POM, respectively, were formed.
  • Regenerative pumps in which the impellers were mounted were assembled in fuel supply systems.
  • the thickness of each of the impellers was measured, and the swelling amount M (mm) of each of the impellers in each of the cases was measured.
  • the liquid temperature was set to 70 degrees, and the discharge pressure was set to 300 kPa.
  • the swelling amount M and the swelling ratio B of each of the resin materials when that of PF is set as 1 was calculated.
  • FIG. 3 is a table of the results of the calculation.
  • the swelling amount M of POM in the impregnation test using the methanol-water solution is a negative value.
  • SH the thrust clearance
  • a desirable resin material for the material of the regenerative pump will now be considered from a viewpoint of a dimensional change in thrust clearance SH caused by swelling of the impeller.
  • the upper limit value of the thrust clearance SH in the case of pumping the methanol-water solution is, as understood from FIG. 2A, 0.07 mm.
  • the thrust clearance SH between the impeller and the inner wall is set to 0.07 mm, and the methanol-water solution is pumped, if the thickness tolerance of the impeller is estimated as about 0.03 mm, the swelling amount M allowed for the impeller, which does not deteriorate the function of the regenerative pump, that is, the allowable swelling amount corresponds to an amount obtained by subtracting the thickness tolerance of the impeller from the upper limit value of the thrust clearance SH (0.07-0.03), that is, 0.04 mm.
  • the swelling ratio B of the resin material is equal to or lower than the allowable swelling ratio based on the allowable swelling amount, even if the resin material swells, the thrust clearance SH does not become 0 (zero), and it shows that the material is suitable as a resin material for the regenerative pump.
  • the swelling ratio B of PPS when that of PF is set as 1 is 0.11. Specifically, the swelling ratio B of PF is 4.45% and that of PPS is 0.49%. Consequently, the resin material that satisfies the stated condition is only PPS. Thus, PPS can be selected as the material for the regenerative pump.
  • the upper limit value of the thrust clearance SH and the swelling ratio B are set on the basis of the mixture ratio of methanol and water. From the upper limit value, swelling ratio B, and thickness T of the impeller, the thrust clearance SH, in the state where the impeller is swollen, that is, the minimum thrust clearance SH, can be estimated.
  • the regenerative pump which does not lock or of which the performance does not deteriorate, even when the impeller becomes swollen, can be constructed.
  • polyphenylene sulfide does not easily cause the seizure phenomenon and has excellent fluidity so that molding is easy. It has been confirmed that even if the impeller is thin or has a complicated shape, it can be molded by using polyphenylene sulfide with high accuracy. On that basis, the possibility of seizure can be avoided.
  • the impeller 1 of the regenerative pump and the pump chamber inner wall 2 are made of polyphenylene sulfide having non-hygroscopicity and a high corrosion resistance with respect to the methanol-water solution and having a low swelling ratio B in the methanol-water solution.
  • the impeller 1 and the inner wall 2 do not corrode and are not largely swollen by the methanol-water fuel, and the thrust clearance SH is stable, so that the function of the regenerative pump can be maintained for long time.
  • the thrust clearance SH By setting the thrust clearance SH on the basis of the swelling ratio B calculated on the basis of the impregnation test of the fuel system, even if the impeller 1 or the inner wall 2 does swell through long-term use, the thrust clearance SH does not become zero. As a result, the regenerative pump can be maintained for long time in the state where the discharge flow rate is high and the pump efficiency is high. Further, the thrust clearance SH does not become zero, so that the impeller 1 and the inner wall 2 do not come into contact with each other. Consequently, although the impeller 1 and the inner wall 2 are made of the same material, i.e., polyphenylene sulfide, there is no possibility that the seizure phenomenon occurs.
  • both the impeller 1 and the inner wall 2 are made of a resin material, a lighter weight, as compared with the conventional regenerative pump in which the inner wall is made of a metal material, is realized. Further, polyphenylene sulfide is cheaper than a metal material, so a lower cost is also achieved.
  • Either the impeller or pump inner wall may be made of polyphenylene sulfide.
  • polyphenylene sulfide can contain a filler.
  • the filer are glass fiber, carbon fiber, and fluorocarbon resin.
  • the amount of the filler is adjusted according to the required performance. It is preferably about 30 to 50 percent by weight.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Fuel Cell (AREA)
US09/939,588 2000-09-20 2001-08-28 Regenerative pump Abandoned US20020054814A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000285182 2000-09-20
JP2000-285182 2000-09-20
JP2001200637A JP2002168188A (ja) 2000-09-20 2001-07-02 再生式ポンプ
JP2001-200637 2001-07-02

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Publication Number Publication Date
US20020054814A1 true US20020054814A1 (en) 2002-05-09

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US09/939,588 Abandoned US20020054814A1 (en) 2000-09-20 2001-08-28 Regenerative pump

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US (1) US20020054814A1 (ja)
EP (1) EP1191227A3 (ja)
JP (1) JP2002168188A (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030072987A1 (en) * 2001-10-11 2003-04-17 Degussa Ag Conduit system for fluids and gases in a fuel cell
US20050173025A1 (en) * 2004-02-10 2005-08-11 Tdk Corporation Rare earth sintered magnet, and method for improving mechanical strength and corrosion resistance thereof
US20090232647A1 (en) * 2008-03-17 2009-09-17 Henkle Jeffrey P Airfoil assembly and method of forming same
US20110192381A1 (en) * 2010-02-09 2011-08-11 Denso Corporation Fuel supply apparatus
US20120251311A1 (en) * 2009-12-16 2012-10-04 Matthias Fischer Fuel pump
US11371511B2 (en) * 2019-02-15 2022-06-28 Toyota Jidosha Kabushiki Kaisha Diagnostic apparatus for fuel pump

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008123183A1 (ja) * 2007-03-23 2008-10-16 Toray Industries, Inc. ポリフェニレンスルフィド樹脂組成物
US9127685B2 (en) 2009-05-20 2015-09-08 Edwards Limited Regenerative vacuum pump with axial thrust balancing means
DE102009028646A1 (de) * 2009-08-19 2011-02-24 Robert Bosch Gmbh Förderaggregat
JP5653531B2 (ja) * 2011-10-13 2015-01-14 三菱電機株式会社 燃料ポンプ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2917563B2 (ja) * 1991-04-15 1999-07-12 株式会社デンソー 渦流式ポンプ
JP3307019B2 (ja) * 1992-12-08 2002-07-24 株式会社デンソー 再生ポンプ
JP3237360B2 (ja) * 1993-02-04 2001-12-10 株式会社デンソー 再生ポンプおよびそのケーシング
JP3586941B2 (ja) 1995-10-17 2004-11-10 新神戸電機株式会社 ポンプ用インペラ
JPH1082395A (ja) * 1996-09-06 1998-03-31 Honda Motor Co Ltd ポンプおよび媒体循環装置
US5702229A (en) * 1996-10-08 1997-12-30 Walbro Corporation Regenerative fuel pump

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030072987A1 (en) * 2001-10-11 2003-04-17 Degussa Ag Conduit system for fluids and gases in a fuel cell
US20050173025A1 (en) * 2004-02-10 2005-08-11 Tdk Corporation Rare earth sintered magnet, and method for improving mechanical strength and corrosion resistance thereof
US7208056B2 (en) * 2004-02-10 2007-04-24 Tdk Corporation Rare earth sintered magnet, and method for improving mechanical strength and corrosion resistance thereof
US20090232647A1 (en) * 2008-03-17 2009-09-17 Henkle Jeffrey P Airfoil assembly and method of forming same
US8348604B2 (en) * 2008-03-17 2013-01-08 Rolls-Royce Corporation Airfoil assembly and method of forming same
US8734606B2 (en) 2008-03-17 2014-05-27 Rolls-Royce Corporation Airfoil assembly and method of forming same
US20120251311A1 (en) * 2009-12-16 2012-10-04 Matthias Fischer Fuel pump
US20110192381A1 (en) * 2010-02-09 2011-08-11 Denso Corporation Fuel supply apparatus
US8869775B2 (en) * 2010-02-09 2014-10-28 Denso Corporation Fuel supply apparatus
US11371511B2 (en) * 2019-02-15 2022-06-28 Toyota Jidosha Kabushiki Kaisha Diagnostic apparatus for fuel pump

Also Published As

Publication number Publication date
JP2002168188A (ja) 2002-06-14
EP1191227A3 (en) 2004-12-08
EP1191227A2 (en) 2002-03-27

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Owner name: MITSUBA CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HONMA, BUNJI;SADAKATA, NOBUYASU;HASEGAWA, KIYOSHI;REEL/FRAME:012125/0446

Effective date: 20010823

STCB Information on status: application discontinuation

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