US20030175110A1 - Pump - Google Patents
Pump Download PDFInfo
- Publication number
- US20030175110A1 US20030175110A1 US10/341,593 US34159303A US2003175110A1 US 20030175110 A1 US20030175110 A1 US 20030175110A1 US 34159303 A US34159303 A US 34159303A US 2003175110 A1 US2003175110 A1 US 2003175110A1
- Authority
- US
- United States
- Prior art keywords
- pump
- casing
- coating
- impeller
- drive shaft
- 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
Links
Images
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
- 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
- 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
- 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
- F05D2300/20—Oxide or non-oxide ceramics
- F05D2300/22—Non-oxide ceramics
- F05D2300/228—Nitrides
-
- 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
- F05D2300/611—Coating
Definitions
- the invention relates to a pump, in particular a fuel pump, having a pump casing, in which a pump chamber is formed, which has an inlet leading to it and an outlet leading away from it, having a pump impeller which is arranged in the pump chamber and is secured to a drive shaft, which can be driven in rotation and is mounted rotatably in bearings in the pump casing.
- the thin coating can be applied with an exactly uniform thickness and thereby makes it possible to maintain low tolerances, so that a good build-up of pressure in the pump is ensured.
- the two pump impellers 3 and 18 comprise phenolic resin.
- the parts of the pump casing 7 are formed from aluminum.
- the cover 6 has a coating of chromium nitride.
- the partition 10 , the separating wall 23 and the bearing wall 27 are completely provided with a coating of chromium nitride.
- the surfaces of the closure wall 29 and of the pressure port 26 around which the fuel washes are coated with chromium nitride.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Compressor (AREA)
Abstract
The invention relates to a pump having a pump casing, in which a pump chamber is formed, having an inlet leading to it and an outlet leading away from it. In the pump chamber there is a pump impeller, which is secured to a drive shaft, which can be driven in rotation and is mounted rotatably in bearings in the pump casing. Surfaces of the pump chamber which bear against the surfaces of the pump impeller and surfaces of the pump impeller which bear against the surfaces of the pump chamber have a coating of low thickness and high hardness which is applied by physical vapor deposition.
Description
- This application claims priority to Application No. 10201405.1 which was filed in the German language on Jan. 15, 2002.
- The invention relates to a pump, and in particular, to a fuel pump.
- For pumps which deliver aggressive liquids, such as fuels, it is known to provide the inner parts of the pumps with a layer of anodized metal to protect against corrosion.
- Currently, fuels increasingly include contaminants, which lead to wear between the parts of the pumps which move relative to one another and damage the layer of anodized metal. Fuels contaminated by water or substances which undergo similar chemical reactions and a very wide range of additives in the fuels can then lead to further damage to the pump parts.
- In the case of pump components made from aluminum, fuels with a high alcohol content lead to oxidation and therefore to blooming and ultimately to the pump impeller becoming blocked. A blockage of this type may also result from the contamination.
- However, very small gaps are required between the moving and stationary pump parts, so that it is possible to build up sufficient pressure, in particular, in the case of a pump which is constructed as a flow pump.
- Further drawbacks of the layer of anodized metal are the high cost of this layer, its environmental incompatibility and its considerable thickness of approximately 30 μm, which leads to wide tolerances. These wide tolerances in turn do not allow a satisfactory build-up of pressure in the pump.
- To mount and guide the drive shaft, bearings, for example in the form of carbon bushes, are arranged in bearing bores in the pump casing. This involves a high level of outlay in terms of assembly and components.
- The invention relates to a pump, in particular a fuel pump, having a pump casing, in which a pump chamber is formed, which has an inlet leading to it and an outlet leading away from it, having a pump impeller which is arranged in the pump chamber and is secured to a drive shaft, which can be driven in rotation and is mounted rotatably in bearings in the pump casing.
- The invention provides a pump of the type described in the introduction which is of simple structure and low-wear design and permanently ensures a high build-up of pressure.
- According to one embodiment of the invention, surfaces of the pump chamber which bear against surfaces of the pump impeller and/or surfaces of the pump impeller which bear against surfaces of the pump chamber have a coating of low thickness and high hardness which is applied by physical vapor deposition.
- The thin coating can be applied with an exactly uniform thickness and thereby makes it possible to maintain low tolerances, so that a good build-up of pressure in the pump is ensured.
- The fact that the coating is built up with a uniform layer growth of dense structure and smooth surface also contributes to this, and furthermore leads to good protection against corrosion and allows the pump to be used for a very wide range of fuel grades and other delivery media.
- The high hardness protects the coating from wear and ensures that the pump has a long service life. This hardness may preferably lie in a range from 2500 HV to 3500 HV (Vickers hardness), but may also lie above or below this range.
- Since low process temperatures are required to produce the coating, there is no distortion of the coated components or changes in the material, for example the microstructure, at these components.
- Since, furthermore, the coating can be applied to a very wide range of materials, it is in each case possible to use the optimum materials and material pairings for pump casing and pump impeller.
- The layer is applied in a manner which does not pollute the environment.
- In another embodiment, the drive shaft is mounted rotatably in bearing bores in the pump casing, the bearing bores and/or the drive shaft having a coating of low thickness and high hardness which is applied by physical vapor deposition.
- In addition to the features of pump casing and pump impeller, the very hard and smooth surface of the coating of bearing bore and/or drive shaft and the tight tolerances means that these parts will transfer the positive properties of a carbon bush as a bearing directly to the simple bearing bore. In this way, it is possible to eliminate separate bearings and the machining of these bearings. If the pump is a flow pump, the tight tolerances of the components which are inevitably required in flow pumps in order to build up pressure and therefore the small gaps between the components which move relative to one another can be minimized.
- This is advantageous in particular if the flow pump is a peripheral impeller or side channel pump.
- Over and above those surfaces of pump impeller and pump chamber which bear against one another, it is also possible for the entire surface of the pump chamber to be provided with a coating which is applied by physical vapor deposition, with the surfaces of the fuel-carrying parts of the pump preferably also being provided with a coating which is applied by physical vapor deposition. As a result, it is possible for the pump to deliver even aggressive media without any damage.
- The fact that the coating has a thickness of approximately 2 μm to approximately 5 μm makes it possible to ensure that the tight production tolerances are met. A layer thickness of 2 μm is entirely sufficient to protect against wear, while 5 μm is preferred if the layer is to protect against corrosion.
- Particularly when the pump is used as a fuel pump, the coating is preferably a chromium nitride layer.
- The pump casing and/or pump impeller may include metal or a metal alloy, in particular of aluminum or aluminum alloy, which are made wear-resistant and corrosion-resistant by the coating but are still easy to produce and lightweight.
- In one alternative, the pump casing and/or pump impeller includes a plastic, in particular a phenolic resin. Parts of this type, which can easily be produced as injection moldings and have a low weight, are also made wear-resistant and able to withstand aggressive delivery media by the coating.
- A particularly favorable material pairing consists in the pump casing including coated aluminum and the pump impeller including phenolic resin. The pump impeller consisting of phenolic resin may be coated or uncoated.
- An exemplary embodiment of the invention is illustrated in the drawing and is described in more detail below.
- FIG. 1 shows a fuel pump with flow pumps as pump stages.
- The pump illustrated in FIG. 1 is a two-stage fuel pump. An electric motor arranged in the closed motor casing1 illustrated can be used to drive a
drive shaft 2 in rotation, a first pump impeller 3 of aperipheral impeller pump 14 being arranged in a rotationally fixed manner on the right-hand end region of thisdrive shaft 2. The radially encircling region of the first pump impeller 3 is formed with a first ring of vanes, which is largely surrounded by an annular passage. Afirst pump chamber 5 is formed as a pot-shaped recess 31 in one end side of a cover 6 which is part of thepump casing 7. - In the
pump cover 7 there is aninlet 8, via which the peripheral impeller pump can suck in fuel. Furthermore, aball 9 is arranged centrally in a receptacle on the side of the first pump impeller 3 in the cover 6, against which ball thedrive shaft 2 is supported at the end side and which ball forms an axial bearing of thedrive shaft 2. - The
first pump chamber 5 is closed off by apartition 10 which bears against the opening in the pot-shaped recess 31 in the cover 6 and through which the drive shaft is guided. Thedrive shaft 2 is guided through abearing bore 11 in thepartition 10, which likewise forms a part of thepump casing 7, and is rotatably mounted directly in thisbearing bore 11. - In a plane which cannot be seen, the
first pump chamber 5 is connected to a radially encirclingannular passage 12 on that side in thepartition 10 which faces theperipheral impeller pump 14, aconnection 13 leading from thisannular passage 12 to that side of thepartition 10 which is remote from theperipheral impeller pump 14 and opening out into afirst side passage 15, which is formed in the shape of a ring at that location, of aside channel pump 16. - On the side of the
first side channel 15, thepartition 10 is likewise designed with a pot-shaped recess 17, which forms a second pump chamber and in which asecond pump impeller 18 of theside channel pump 16 is arranged, this second pump impeller likewise being seated in a rotationally fixed manner on thedrive shaft 2. - In one of its side faces, the
second pump impeller 18 has a second ring ofvanes 19 which is aligned with thefirst side channel 16 and is connected, viaaxial apertures 20, to a third ring ofvanes 21 on the other side face of thepump impeller 18. - The third ring of
vanes 21 is covered by an annularsecond side channel 22, which is formed in apartition 23, closes off the pot-shaped opening 14, forms part of thepump casing 7 and is guided through adrive shaft 2. - The
partition 23 separates theside channel pump 16 from the motor casing 1, theoutlet 24 formed in thepartition 23 opening out into the motor casing 1. The fuel which is delivered flows through the motor casing 1 and is fed via anonreturn valve 25 to apressure port 26 of the fuel pump, which are arranged in aclosure wall 29. Aplug contact 30 for supplying power to the electric motor is likewise located in theclosure wall 29. - A
bearing wall 27, which has a second bearing bore 28 coaxially with respect to thefirst bearing bore 11, is arranged in the end region of the motor casing 1 on the side of thepressure port 27, in which second bearing bore 28 the left-hand end of thedrive shaft 2 is directly rotatably mounted. - The two
pump impellers 3 and 18 comprise phenolic resin. The parts of thepump casing 7 are formed from aluminum. In all the regions which face thepartition 10 and in theinlet 8, the cover 6 has a coating of chromium nitride. Thepartition 10, theseparating wall 23 and thebearing wall 27 are completely provided with a coating of chromium nitride. Furthermore, the surfaces of theclosure wall 29 and of thepressure port 26 around which the fuel washes are coated with chromium nitride. - The cylindrical inner walls of the first and second bearing bores11 and 28 are also coated. In addition, the
drive shaft 2 consisting of steel has a chromium nitride coating in its regions located in the bearing bores 11 and 28. - These chromium nitride coatings have been applied by physical vapor deposition and have a thickness of 5 μm and a Vickers Hardness of approximately 2500 HV.
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Claims (11)
1. A pump, comprising:
a pump casing, in which a pump chamber is formed, which has an inlet leading to the casing and an outlet leading away from the casing; and
a pump impeller which is arranged in the pump chamber and is secured to a drive shaft, which can be driven in rotation and is mounted rotatably in bearings in the pump casing, wherein
surfaces of the pump chamber which bear against surfaces of the pump impeller and/or surfaces of the pump impeller which bear against surfaces of the pump chamber have a coating of low thickness and high hardness which is applied by physical vapor deposition.
2. The pump according to claim 1 , wherein the drive shaft is mounted rotatably in bearing bores in the pump casing, the bearing bores and/or the drive shaft having a coating of low thickness and high hardness which is applied by physical vapor deposition.
3. The pump according to claim 1 , wherein the pump is a flow pump.
4. The pump according to claim 3 , wherein the flow pump is a peripheral impeller or side channel pump.
5. The pump according to claim 1 , wherein the surface of the pump chamber is provided with a coating which is applied by physical vapor deposition.
6. The pump according to claim 1 , wherein the surfaces of the fuel-carrying parts of the pump are provided with a coating which is applied by physical vapor deposition.
7. The pump according to claim 1 , wherein the coating has a thickness of approximately 2 μm to approximately 5 μm.
8. The pump according to claim 1 , wherein the coating is a chromium nitride layer.
9. The pump according to claim 1 , wherein the pump casing and/or pump impeller comprises metal or a metal alloy.
10. The pump according to claim 1 , wherein the pump casing and/or pump impeller comprises a plastic.
11. The pump according to claim 1 , wherein the pump is a fuel pump.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10201405.1 | 2002-01-15 | ||
DE10201405A DE10201405A1 (en) | 2002-01-15 | 2002-01-15 | Pump for pumping fuel has a pump casing with a pumping chamber fitted with inlets and outlets as well as a pumping wheel in the chamber fastened on a drive shaft rotating on bearings in the casing. |
Publications (1)
Publication Number | Publication Date |
---|---|
US20030175110A1 true US20030175110A1 (en) | 2003-09-18 |
Family
ID=7712249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/341,593 Abandoned US20030175110A1 (en) | 2002-01-15 | 2003-01-14 | Pump |
Country Status (7)
Country | Link |
---|---|
US (1) | US20030175110A1 (en) |
EP (1) | EP1466099B1 (en) |
CN (1) | CN1589373A (en) |
BR (1) | BR0215501B1 (en) |
DE (2) | DE10201405A1 (en) |
ES (1) | ES2280609T3 (en) |
WO (1) | WO2003060328A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080008578A1 (en) * | 2006-06-29 | 2008-01-10 | Grundfos Management A/S | Centrifugal pump assembly |
US20120057995A1 (en) * | 2009-05-20 | 2012-03-08 | Edwards Limited | Side-channel compressor with symmetric rotor disc which pumps in parallel |
US20120219409A1 (en) * | 2011-02-28 | 2012-08-30 | Judeth Brannon Corry | Pump used in gasification system |
CN103069166A (en) * | 2010-08-11 | 2013-04-24 | 日立空调·家用电器株式会社 | Refrigerant compressor |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4792353A (en) * | 1986-10-10 | 1988-12-20 | Massachusetts Institute Of Technology | Aluminum oxide-metal compositions |
US5449547A (en) * | 1993-03-15 | 1995-09-12 | Teikoku Piston Ring Co., Ltd. | Hard coating material, sliding member coated with hard coating material and method for manufacturing sliding member |
US5842845A (en) * | 1995-10-18 | 1998-12-01 | Matsushita Electric Industrial Co., Ltd. | Scroll compressor and method for manufacturing an oldham ring therefor |
US20010004435A1 (en) * | 1997-05-09 | 2001-06-21 | Woodard John Campbell | Rotary pump with hydrodynamically suspended impeller |
US6402460B1 (en) * | 2000-08-01 | 2002-06-11 | Delphi Technologies, Inc. | Abrasion wear resistant fuel pump |
US6435810B1 (en) * | 2000-10-20 | 2002-08-20 | Delphi Technologies, Inc. | Wear resistant fuel pump |
US6543424B1 (en) * | 1999-08-12 | 2003-04-08 | Hitachi, Ltd. | Fuel pump, in-cylinder direct injection type internal combustion engine using the same and surface treatment method |
US6598720B2 (en) * | 2000-10-20 | 2003-07-29 | Ina Walzlager Schaeffler Ohg | Fan clutch |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4134875C2 (en) * | 1991-10-23 | 2000-04-20 | Mannesmann Vdo Ag | Fuel delivery system |
DE19539909B4 (en) * | 1995-07-27 | 2005-02-10 | Aisan Kogyo K.K., Obu | Peripheral |
US5549446A (en) * | 1995-08-30 | 1996-08-27 | Ford Motor Company | In-tank fuel pump for highly viscous fuels |
-
2002
- 2002-01-15 DE DE10201405A patent/DE10201405A1/en not_active Ceased
- 2002-12-20 DE DE50209806T patent/DE50209806D1/en not_active Expired - Lifetime
- 2002-12-20 ES ES02795028T patent/ES2280609T3/en not_active Expired - Lifetime
- 2002-12-20 BR BRPI0215501-0A patent/BR0215501B1/en not_active IP Right Cessation
- 2002-12-20 EP EP02795028A patent/EP1466099B1/en not_active Expired - Fee Related
- 2002-12-20 WO PCT/DE2002/004702 patent/WO2003060328A1/en active IP Right Grant
- 2002-12-20 CN CNA028228332A patent/CN1589373A/en active Pending
-
2003
- 2003-01-14 US US10/341,593 patent/US20030175110A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4792353A (en) * | 1986-10-10 | 1988-12-20 | Massachusetts Institute Of Technology | Aluminum oxide-metal compositions |
US5449547A (en) * | 1993-03-15 | 1995-09-12 | Teikoku Piston Ring Co., Ltd. | Hard coating material, sliding member coated with hard coating material and method for manufacturing sliding member |
US5842845A (en) * | 1995-10-18 | 1998-12-01 | Matsushita Electric Industrial Co., Ltd. | Scroll compressor and method for manufacturing an oldham ring therefor |
US20010004435A1 (en) * | 1997-05-09 | 2001-06-21 | Woodard John Campbell | Rotary pump with hydrodynamically suspended impeller |
US6543424B1 (en) * | 1999-08-12 | 2003-04-08 | Hitachi, Ltd. | Fuel pump, in-cylinder direct injection type internal combustion engine using the same and surface treatment method |
US6402460B1 (en) * | 2000-08-01 | 2002-06-11 | Delphi Technologies, Inc. | Abrasion wear resistant fuel pump |
US6435810B1 (en) * | 2000-10-20 | 2002-08-20 | Delphi Technologies, Inc. | Wear resistant fuel pump |
US6598720B2 (en) * | 2000-10-20 | 2003-07-29 | Ina Walzlager Schaeffler Ohg | Fan clutch |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9028204B2 (en) * | 2006-06-29 | 2015-05-12 | Grundfos Management A/S | Centrifugal pump assembly |
US20080008578A1 (en) * | 2006-06-29 | 2008-01-10 | Grundfos Management A/S | Centrifugal pump assembly |
US9334873B2 (en) * | 2009-05-20 | 2016-05-10 | Edwards Limited | Side-channel compressor with symmetric rotor disc which pumps in parallel |
US9086071B2 (en) | 2009-05-20 | 2015-07-21 | Edwards Limited | Side-channel pump with axial gas bearing |
US9127685B2 (en) | 2009-05-20 | 2015-09-08 | Edwards Limited | Regenerative vacuum pump with axial thrust balancing means |
US20120057995A1 (en) * | 2009-05-20 | 2012-03-08 | Edwards Limited | Side-channel compressor with symmetric rotor disc which pumps in parallel |
CN103069166A (en) * | 2010-08-11 | 2013-04-24 | 日立空调·家用电器株式会社 | Refrigerant compressor |
US20130195707A1 (en) * | 2010-08-11 | 2013-08-01 | Hitachi Appliances, Inc. | Refrigerant Compressor |
KR20120098510A (en) * | 2011-02-28 | 2012-09-05 | 제너럴 일렉트릭 캄파니 | Pump used in gasification system |
US20120219409A1 (en) * | 2011-02-28 | 2012-08-30 | Judeth Brannon Corry | Pump used in gasification system |
AU2012201138B2 (en) * | 2011-02-28 | 2016-08-11 | Air Products And Chemicals, Inc. | Pump used in gasification system |
US9909217B2 (en) * | 2011-02-28 | 2018-03-06 | General Electric Company | Pump used in gasification system |
KR101869564B1 (en) * | 2011-02-28 | 2018-06-20 | 제너럴 일렉트릭 캄파니 | Pump used in gasification system |
Also Published As
Publication number | Publication date |
---|---|
WO2003060328A1 (en) | 2003-07-24 |
EP1466099A1 (en) | 2004-10-13 |
BR0215501A (en) | 2004-12-14 |
CN1589373A (en) | 2005-03-02 |
ES2280609T3 (en) | 2007-09-16 |
DE50209806D1 (en) | 2007-05-03 |
EP1466099B1 (en) | 2007-03-21 |
BR0215501B1 (en) | 2011-03-09 |
DE10201405A1 (en) | 2003-07-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SIEMNES AKTIENGESELLSCHAFT, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHMIDT, CHRISTOPH;WEHRUM, BERND;REEL/FRAME:014063/0924;SIGNING DATES FROM 20030422 TO 20030505 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |