CN1483931A

CN1483931A - Fnel pump with acid-resisting film bearing

Info

Publication number: CN1483931A
Application number: CNA031540198A
Authority: CN
Inventors: 武井大明; 间真司
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2002-08-30
Filing date: 2003-08-14
Publication date: 2004-03-24
Anticipated expiration: 2023-08-14
Also published as: JP2004092484A; BR0303131A; CN1311157C

Abstract

To provide a fuel pump having a motor whose bearing member is acid resistant. A bearing member 30 of this fuel pump has a bearing body 32 and a covering material 34 covering the entire surface of the body 32. The body 32 is formed of Cu-Ni-Zn alloy powder by sintering it. The covering material 34 is formed by spraying polytetrafluoroethylene (PTFE) to the body 32, having a thickness in a range of 1 [mu]m and 50 [mu]m. The Cu-Ni-Zn alloy forming the body 32 exhibits good sulfuration resistance and the PTFE forming the covering material 34 exhibits good acid resistance and good sulfuration resistance. (C)2004,JPO.

Description

The petrolift that has acidproof foil bearing

Technical field

The present invention relates to a kind of petrolift from the fuel pot pump fuel.

Background technique

Hitherto known petrolift has one by the impeller of electrical motor driven, and for example, the fuel in the impeller pumping fuel pot also supplies to internal-combustion engine.Pumping comprises a certain amount of sulfur component and not fully during the fuel of refining, the bearing that is used for the support electric motor rotor shaft can cure and corrode when this petrolift is used for.Therefore, this just requires to provide a kind of and has anti-vulcanization characteristics and can prevent the bearing that corrodes.In addition, may contain organic acid in the fuel, therefore also require this bearing to have acid resistance.

Summary of the invention

The invention provides a kind of durable petrolift, even be used for the not abundant fuel of refining of pumping sulfur-bearing and/or organic acid composition.An object of the present invention is to provide a kind of like this petrolift, described petrolift has acid proof bearing.The bearing that the petrolift that another object of the present invention provides had has acid resistance and anti-sulfuration property simultaneously.

Above-mentioned petrolift comprises an electric motor and the impeller by electrical motor driven, all is arranged in the shell.The rotor of electric motor is supported in the enclosure rotationally by a pair of bearing that is arranged at two axle heads of rotor.Petrolift is immersed in the fuel of fuel pot, and when impeller was rotated by electrical motor driven, fuel was inhaled into petrolift and supplies to internal-combustion engine by the fuel channel that is formed in the petrolift.

Each bearing is formed by cylinder-shaped bearing body and the protective film that covers the bearing support surface, and protective film forms by coating the acid resistance material.Because protective film can prevent that bearing from by the corrosion of the acidic materials in the fuel, therefore having improved the serviceability of petrolift.

Preferred mode is that the material of making protective film has acid resistance and anti-sulfuration property preferably, and like this, even petrolift is used to not fully under the fuel situation of refining of sulfur-bearing or acid composition, bearing can be by fuel corrosion yet.To be bearing made by the material of anti-sulfuration property better mode, even the protective film removal that is worn like this, bearing also can prevent to be corroded.

If the cylinder-shaped bearing body is exposed to the surface of the part in the fuel and scribbles protective film, bearing can be protected fully, to prevent corrosion.Yet, preferably be coated with the processor of protective film with simplification at bearing support all surfaces covered with protective film.Preferably the thickness of protective film is set to 1 μ m to 50 μ m.

According to the present invention, even under the situation of using sulfur-bearing and/or acid composition fuel, the excellent durability of petrolift still can be guaranteed.With reference to the accompanying drawing description of preferred embodiments, can understand other purpose of the present invention and feature from following better.

Description of drawings

Figure 1A is the sectional view of the bearing of petrolift of the present invention;

Figure 1B is the enlarged view (shown in the IB among Figure 1A) of Figure 1A middle (center) bearing part;

Fig. 2 is the sectional view of petrolift of the present invention.

Embodiment

Below in conjunction with accompanying drawing preferred forms of the present invention is described.

Petrolift 10 as shown in Figure 2 is used for the internal-combustion engine electronic-controlled fuel injection system.Petrolift 10 is immersed in the fuel pot of vehicle, and its pumping and fuel supplying are to fuel injection system.

Petrolift 10 is made up of pump assembly 20 and electric motor 50, all is arranged in the cylinder blanket 11.Electric motor 50 is d.c. motors, has an annular permanent magnnet and a rotor 52 that is arranged on permanent magnet rotationally that is positioned at shell 11.Electric current is fed to electric motor 50 by the brush (not shown).

Pump assembly 20 is made up of pump case 21, pump cover 22 and impeller 23.Form fuel channel 61 between pump case 21 and the pump cover 22, impeller 23 is arranged in the fuel channel 61 rotationally.Impeller 23 is dish types, has several and is staggered to form blade and groove on the disc rotor outer surface.For example, pump case 21 and pump cover 22 usefulness die castings are made of aluminum.

Pump case 21 closely is connected an end of cylinder blanket 11, and the bearing 30 that is used for support rotor axle 55 is fixed on the central authorities of pump case 21.Pump cover 22 and pump case 21 next-door neighbours are to form fuel channel 61 between pump case 21 and pump cover 22.Pump cover 22 also is securely connected this end at cylinder blanket 11.One end of rotor shaft 55 is supported rotationally by bearing 30, and the other end of rotor shaft 55 is supported rotationally by another bearing 40.

The shape of bearing 30,40 is shown in Figure 1A and 1B.Bearing 30 (40) is made up of cylinder-shaped bearing body 32 (42) and the protective film 34 (44) that covers bearing support 32 (42) all surfaces.Because bearing 30,40 similar are only described as representative with bearing 30 below.Bearing support 32 forms cylindrical by sintered copper-nickel-Zinc alloy powder.Protective film 34 is made by teflon (being PTFE).It can form by the surface that is sprayed on bearing support 32.The thickness range of protective film 34 is set in 1 μ m to 50 μ m.The bearing support 32 that is formed by copper-nickel-zinc alloy has high anti-sulfuration, and the protective film 34 that is formed by teflon all has superior function aspect acid resistance and the anti-sulfuration property.

As shown in Figure 2, rotor 52 comprises that one is wrapped in the armature coil of magnetic core 5 2A and the rectifier 54 of a dish type that supplies current to armature coil.A terminal 68 is arranged on the connector 67.Electric current is by terminal 68, and brush (not shown) and rectifier 54 are fed to the armature coil of rotor 52 from external power supply.

The operation of petrolift 10 can be briefly described as follows with reference to Fig. 2.When electric motor 50 energisings, impeller 23 rotates in fuel channel 61.Fuel in the fuel pot is drawn into fuel channel 61 from import 60.Fuel is the effect of being under pressure in fuel channel 61, is transported in the fuel chambers 51 of electric motor 50 by the opening (not shown) that is formed on the pump case 21.Outlet 65 is further sent in fuel in the fuel chambers 51 air clearance peripheral by rotor 52 and that be arranged between the circular permanent magnet of shell 11 interior peripheries.Fuel is fed to internal-combustion engine from exporting 65, and one-way valve 66 is arranged in outlet 65 the passage to stop fuel to reflux.

As mentioned above, the whole surface coverage of bearing 30 (40) has the protective film 34 of strong acid resistance and anti-sulfuration property.So even petrolift 10 is used for not fully during the fuel of refining of sulfur-bearing and/or organic acid composition, bearing can prevent to be corroded.Because protective film 34 is made the rotational resistance that has reduced roller axle 55 and bearing 30,40 by PTFE, rotor rotates under the support of bearing smoothly, and the efficient of petrolift 10 is improved.Because PTFE has stronger corrosion resistance, prolonged the life-span of bearing again.Bearing support 32 is made by copper-nickel-zinc alloy, and it has superpower anti-sulfuration, even therefore protective film 34 is worn or peels off because of other reason, bearing 30 can not corroded by the sulphur composition yet.

Because protective film 34 forms thickness and is at least 1 μ m, the acid resistance of bearing and anti-sulfuration property all can be guaranteed.On the other hand, the thickness of protective film 34 is controlled in and is no more than 50 μ m, and therefore, gap suitable between rotor shaft 55 and the bearing 30 also can be guaranteed, and protective film 34 can not produce opposite effect to the level and smooth rotation of rotor 52.

Protective film 34 can to replace PTFE, also can select the mixture of nickel plating and PTFE to form by forming at bearing support 32 surface gold-plating, nickel, tin.Copper-nickel-zinc alloy can be by materials similar such as copper base nickel alloy or copper base zinc alloy, or copper base nickel zinc alloy replaces.In addition, in some specific application, copper-nickel-zinc alloy can be replaced by other material that does not have anti-sulfuration property.When not requiring when having anti-sulfuration property, the PTFE material that is used for forming protective film 34 also can be had acid proof material by other and replace.

Though all surfaces of the bearing support 32 in the previous embodiment is coated with protective film 34, also can only apply the part that is exposed in the fuel.Bearing structure as shown in Figure 2, axial two ends and the internal surface at bearing 30 must be coated with protective film 34 at least.Because the outer surface of bearing support 32 inserts the central authorities of pump case 21 and is not exposed in the fuel, so needn't be at the outer surface coating protective film 34 of bearing support 32.Yet if at all surfaces coating protective film 34 of bearing support 32, the processing procedure that forms protective film is oversimplified.

Although the embodiment with reference to the front is described the present invention, those skilled in the art all should fall into the protection domain of claim of the present invention to the improvement of its form done or details obviously.

Claims

1, the petrolift of fuel in a kind of pump fuel jar comprises:

Shell;

Be arranged at the electric motor that has rotor in the shell; With

Support the bearing of the rotor that is arranged in shell rotationally, it is characterized in that,

Described bearing comprises bearing support and covers the protective film that is exposed at part in the fuel at least; With

Protective film has acid resistance.

2, petrolift as claimed in claim 1 is characterized in that, described protective film also has anti-sulfuration property.

3, petrolift as claimed in claim 1 or 2 is characterized in that, bearing support is cylindrical; With

At least internal surface and two axle heads at the cylinder-shaped bearing body are coated with protective film.

4, petrolift as claimed in claim 1 or 2 is characterized in that, all surfaces of bearing support is coated with protective film.

As claim 1 one 4 arbitrary described petrolifts, it is characterized in that 5, bearing support is made by the material with anti-sulfuration property.

As the arbitrary described petrolift of claim 1-5, it is characterized in that 6, the thickness range of protective film is that 1 μ m is to 50 μ m.

7, the petrolift of fuel in a kind of pump fuel jar comprises:

Shell;

Be arranged at the electric motor that has rotor in the shell; With

Support the pair of bearings of the rotor that is arranged in shell rotationally, it is characterized in that,

Each bearing comprises the cylinder-shaped bearing body and covers the protective film of cylinder-shaped bearing body all surfaces;

The cylinder-shaped bearing body is made by the material with anti-sulfuration property;

Protective film is made by the material with acid resistance and anti-sulfuration property.

8, petrolift as claimed in claim 7 is characterized in that, the cylinder-shaped bearing body is made by copper-nickel-zinc alloy.

9, petrolift as claimed in claim 7 is characterized in that, protective film is made by teflon.