CN101787944A

CN101787944A - Fuel pump

Info

Publication number: CN101787944A
Application number: CN200910176626A
Authority: CN
Inventors: 吉冈浩
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2009-01-23
Filing date: 2009-09-23
Publication date: 2010-07-28
Anticipated expiration: 2029-09-23
Also published as: CN101787944B; JP2010169033A; JP5207999B2

Abstract

The invention provides a fuel pump, capable of effectively preventing a counter-flow area from generating in a pump flow path and promoting rotational flow formation to increase the flow rate and the flow speed of the fuel thereby increasing the pump efficiency. The fuel pump comprises a circular-plate shaped rotation component with a seal part at the perimeter and a blade plate (32) at the inner perimeter; a flow component (40,50) rotatably housing the rotation component and comprising a pump groove for forming a pump flow (11), wherein the pump groove is formed into an arc shape along the blade plate and provided with a fuel inlet (51) and a fuel outlet (41) and the fuel sucked through the fuel inlet is discharged from the fuel outlet through the pump flow by rotating by the rotation component and the fuel pump comprises a C shaped core ring (60) and arranged in the pump flow (11) between the fuel inlet and the fuel outlet and the section center is approximately same to the center of the rotation flow generated in the pump flow (11).

Description

Petrolift

Technical field

The present invention relates to a kind of petrolift that will spray from the fuel that fuel tank sucks.

Background technique

Current, known in the petrolift of the eddy flow by in the pump stream, generating fluid as the rotation of the impeller of rotary component, remain in a standstill in order to prevent that core at eddy flow from producing, thereby, the patent documentation 1 disclosed guide portion that is provided with like that for example, the approximate center that it is positioned at eddy flow, preventing to remain in a standstill produces, and improves flow fuel and flow velocity in the pump stream, improve pump efficiency, wherein, above-mentioned impeller forms discoideus, has vane plate in its outer periphery.

Patent documentation 1: the spy opens flat 7-133786 communique

Summary of the invention

In petrolift as noted above, because the viscous flow of eddy flow core is regional and be in a ratio of low pressure on every side, so become the adverse current zone with respect to the flow direction of pump stream inside.Under the situation between the vane plate of core at impeller of eddy flow, owing to being blocked by each vane plate in the adverse current zone, so the influence of adverse current is less.

On the contrary, eddy flow be centered close to impeller when outside, it is big that the influence in adverse current zone becomes, pump efficiency descends.In described prior art, because the guide portion of eddy flow is arranged between the vane plate of impeller,, that is, when eddy flow is centered close to the impeller outside, can't prevent to remain in a standstill so produce following problems, can't produce the effect that prevents adverse current.

The present invention proposes in view of described problem points, and its purpose is to provide a kind of petrolift, and it prevents effectively in the inner adverse current zone that produces of pump stream, and the formation of promotion eddy flow and raising flow fuel and flow velocity, thereby improves pump efficiency.

The present invention is a kind of petrolift, and it has: discoideus rotary component, and its outer periphery have sealed department, and week have vane plate in it; And channel member, it rotatably accommodates described rotary component, has the pump groove that forms the pump stream, this pump groove forms circular-arc along described vane plate, this pump groove is provided with fuel inlet and fuel outlet, this petrolift is rotated by described rotary component, thereby will discharge from described fuel outlet via described pump stream from the fuel that described fuel inlet sucks, it is characterized in that, this petrolift has the core ring (corering) of C word shape, it is arranged on the inside of the described pump stream between described fuel inlet and the described fuel outlet, and the section center of this core ring is roughly consistent with the center of the eddy flow that produces in described pump stream.

The effect of invention

According to petrolift involved in the present invention, the core ring can prevent that the viscous flow that takes place owing to the eddy flow center from producing the adverse current zone in the pump stream, promote eddy flow to form.Thus, the flow velocity of the fuel in the pump stream and flow are increased, thereby improve pump efficiency.In addition, because the core annular is formed in the interior fuel inlet of pump stream between the fuel outlet, so can will not form the part of pump stream as sealed department.Thus, sealed department can be guaranteed sealing along circumferentially continuously.

Description of drawings

Fig. 1 is the sectional drawing of the petrolift of representing that schematically one embodiment of the present of invention are related.

Fig. 2 is the schematic representation of the pump stream of the related petrolift of expression one embodiment of the present of invention, is the enlarged view (II of encirclement portion of Fig. 1) of impeller outer perimembranous periphery.

Fig. 3 is the sectional drawing that the III-III line along Fig. 1 cuts off.

Fig. 4 is the sectional drawing that the IV-IV line along Fig. 1 cuts off.

Fig. 5 is the plan view of the impeller of the related petrolift of expression one embodiment of the present of invention.

Fig. 6 is the oblique drawing of the core ring of the related petrolift of expression one embodiment of the present of invention.

Fig. 7 is other embodiment's of expression core ring a oblique drawing.

Embodiment

Below, based on the description of drawings embodiments of the invention.In Fig. 1, petrolift 1 is housed in the fuel supply system of for example electronic type fuel injection system in the fuel tank of vehicle etc., and the fuel that will suck from fuel tank is to starting pusher side to supply with.

Petrolift 1 is by pump portion 10 and this pump portion 10 is carried out drive electric motor portion 20 constitute.Motor part 20 is the direct current motors that have brush, and it constitutes, and ring-type configuration permanent magnet in shell 21 cylindraceous is at interior all side configuration armatures 22 of this permanent magnet.

Armature 22 rotatably is housed in the motor part 20, and coil is wrapped on the periphery of iron core 23.Commutator 24 forms discoideus, is configured in the top of armature 22.Never illustrated power supply is via being embedded in the terminal 26 in the connector 25, not shown brush and commutator 24, to the coil supply capability.Supply with the electric power that come and after being rotated armature 22 utilization, as running shaft 27 rotations of the impeller 30 of rotary component with armature 22.

Pump portion 10 is made of impeller 30, housing body 40 and housing cover body 50.Fig. 2 illustrates the enlarged view (II of encirclement portion of Fig. 1) of impeller outer perimembranous periphery, Fig. 3 illustrates the slip surface (the section III-III of Fig. 1) of the housing cover body 50 that slides with respect to impeller 30, Fig. 4 illustrates the slip surface (the section IV-IV of Fig. 1) of housing body 40, and Fig. 5 illustrates impeller 30.Impeller 30 is so-called side channel types, and its formation is roughly discoideus, has outer shroud 80 as sealed department in outer periphery, and all within it sides have vane plate 32.Constitute a channel member by housing body 40 and housing cover body 50, impeller 30 is rotatably accommodated by portion within it.

Impeller 30 rotates if follow the rotation of armature 22, then to pump stream 11, suck fuel from the fuel inlet 51 that forms at housing cover body 50, this fuel is accepted kinetic energy from each vane plate 32 of impeller 30,, discharge by the fuel outlet 41 in housing body 40 formation shown in Figure 4 from pump stream 11 to fuel chambers 12.Be expelled to the fuel of fuel chambers 12, around armature 22, be expelled to the outside of petrolift 1 from ejiction opening 28.Accommodate safety check 29 in ejiction opening 28, this safety check 29 prevents from the fuel adverse current of ejiction opening 28 ejections.

As shown in Figure 1, housing body 40 and housing cover body 50 for example form by cast aluminium forming.Housing body 40 is pressed on the side end that is fixed on shell 21, therein the chimeric bearing 13 of the heart.Housing cover body 50 is fixed on the end of shell 21 by riveted joint etc. under the state that is covered by housing body 40.Be pressed at the center of housing cover body 50 and be fixed with thrust-bearing 14.One side end of the running shaft 27 of armature 22 is rotatably supported diametrically by bearing 13, simultaneously, and by the load on the thrust-bearing 14 bearing thrust directions.The end side of running shaft 27 is rotatably supported diametrically by bearing 15.

On housing cover body 50, as shown in Figure 3, the pump groove 52 of formation pump stream 11 forms circular-arc along the vane plate 32 of impeller 30.In addition, in housing body 40, as shown in Figure 4, the pump groove 42 that forms pump stream 11 also forms circular-arc along the vane plate 32 of impeller 30.In housing cover body 50, form fuel inlet 51,, and the fuel in the not shown fuel tank is sucked into the pump stream 11 from fuel inlet 51 by impeller 30 rotations.Be sucked into the fuel in the pump stream 11, pressurized owing to the rotation of impeller 30, by the path 81 that forms between other vane plate 32 of vane plate in the impeller 30 32 and adjacency, and pump stream 11 by on housing body 40, forming, pressurized owing to the rotation of impeller 30 once more, discharge to the fuel chambers 12 of motor part 20 from fuel outlet 41.

As Fig. 2, Fig. 3 and shown in Figure 4, be provided with core ring 60 in the inside of pump stream 11.Core ring 60 lays respectively in the pump groove 42 of the pump groove 52 of housing cover body 50 and housing body 40, is arranged on the approximate center of pump stream 11, forms the C word shape of circumferential part of opening.In addition, core ring 60 is arranged on the fuel inlet 51 of pump stream 11 between the fuel outlet 41.As shown in Figure 6, core ring 60 has circular section and forms the C word shape, and its two end part have to described

pump groove

42 and 52 and are pressed into fixing fixedly axial region 82.Fixedly axial region 82 is bent into mild R shape on the axial rotary of impeller 30.

Applied fuel behind the energy of the sense of rotation of impeller 30 by vane plate 32, not only flow to sense of rotation, also shown in the arrow of Fig. 2, be rotated as the center with the core ring 60 of the approximate center that is arranged on pump stream 11, form the eddy flow that circles round along pump groove 42,52.Core ring 60 promotes its formation by the eddy flow channeling conduct to fuel.In addition, become near the center of eddy flow near the section central part of pump stream 11,, remain in a standstill, produce the adverse current zone with respect to the flow direction of pump stream 11 easily so produce because flow velocity is little.Therefore, by in this adverse current zone, core ring 60 being set, thereby reduce the generation of adverse current.

On pump housing housing 50, between the terminal part 79 of fuel inlet 51 and pump stream 11, form sealed department 50a.In housing body 40, also in the same manner, begin to form between portion 85 and the fuel outlet 41 sealed department 44a at the pump stream.Because core ring 60 is formed in the interval that does not form sealed

department

50a and 44a, thus not can to guarantee accurately between impeller 30 and sealed department 50a and the 44a radial clearance this produce harmful effect on the one hand, can prevent that sealing from worsening.

Core ring 60 is pressed into to be fixed in

pump groove

42 and 52 by fixing axial region 82 and is provided with.

Pump groove

42 and 52 has and is used for fixing axial region 82 is pressed into fixing hole 84.Fixing by core ring 60 is pressed into, can between the surface of core ring 60 and impeller 30, guarantee micro-gap easily and accurately.In addition, as shown in Figure 7, by near the central authorities of the C of core ring 60 word shape, appending fixedly axial region 83, can guarantee more accurately and impeller 30 between micro-gap.In addition, because in fixing axial region 82, the two end part of C word shape are bent into mild R shape on the axial rotary of described impeller 30, so even, also can not be hooked on the vane plate 32 of impeller 30 just in case core ring 60 contacts with impeller 30 in rotating.

As described above, related according to one embodiment of present invention petrolift 1, owing in the approximate centre portion of pump stream 11 core ring 60 is set, the mobile of fuel that forms by impeller 30 is to circle round in the center with core ring 60.Thus, can promote in pump stream 11, to form fuel swirl, prevent to produce the adverse current zone owing to remaining in a standstill.Thus, can improve the flow velocity of the fuel in the pump stream 11, thereby improve pump efficiency.

In addition, in one embodiment of the invention, because core ring 60 is formed on fuel inlet 51 in the pump stream 11 between the fuel outlet 41, so can will not form the part of pump stream 11 as sealed department.Thus, sealed

department

50a and 44a can improve sealing along circumferentially continuously.

In addition, in one embodiment of the invention because core ring 60 has to pump

groove

42 and 52 and is pressed into fixing fixedly axial region 82, so can be set to impeller 30 between have micro-gap and do not contact, thereby the loss that can avoid slip resistance to cause improves pump efficiency.In addition, because in the fixedly axial region 82 of core ring 60, the two end part of C word shape impeller 30 axially on be bent into mild R shape, so even just in case core ring 60 contact with impeller 30, also can prevent to be hooked on the vane plate 32 of impeller 30, can improve reliability.

More than, in one embodiment of the invention, illustration has also illustrated the petrolift of application side grooved impeller.But the present invention also can be applied to have in the petrolift of vane plate kinds such as enclosed blade or open type blade.

Claims

1. petrolift, it has: discoideus rotary component, its outer periphery have sealed department, and week have vane plate in it; And channel member, it rotatably accommodates described rotary component, has the pump groove that forms the pump stream, this pump groove forms circular-arc along described vane plate, this pump groove is provided with fuel inlet and fuel outlet, this petrolift is rotated by described rotary component, thereby will discharge from described fuel outlet via described pump stream from the fuel that described fuel inlet sucks

It is characterized in that,

This petrolift has the core ring of C word shape, and it is arranged on the inside of the described pump stream between described fuel inlet and the described fuel outlet, and the section center of this core ring is roughly consistent with the center of the eddy flow that produces in described pump stream.

2. petrolift as claimed in claim 1 is characterized in that,

Described core ring has to the fixing fixedly axial region of described pump groove.

3. petrolift as claimed in claim 2 is characterized in that,

In the described fixedly axial region of described core ring, the two end part of C word shape described rotary component axially on be bent into mild R shape.

4. as any described petrolift in the claim 1 to 3, it is characterized in that,

Described core ring is set to, and the section center is roughly consistent with the center of the described eddy flow that produces in the outside of described rotary component.