CN104040180A

CN104040180A - Fuel pump

Info

Publication number: CN104040180A
Application number: CN201180074162.4A
Authority: CN
Inventors: 滨谷祐多郎
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2011-10-13
Filing date: 2011-10-13
Publication date: 2014-09-10
Also published as: IN2014CN02439A; TW201315894A; DE112011105737T5; JPWO2013054412A1; JP5653531B2; TWI464321B; KR20140021064A; US20140169960A1; WO2013054412A1

Abstract

In order to obtain a fuel pump with a simple and inexpensive construction, and with which problems such as increased rotational resistance of the impeller and locking of the pump chamber can be prevented, thereby ensuring reliability and maintaining pump performance, recessed shapes (35, 36) of a micron-order size which takes into account the amount of swelling of a group of recesses (20b, 20c) of the impeller (20) are formed at locations on at least one seal part of a casing (18) which oppose the group of recesses (20b, 20c) of the impeller, or, the shapes of the group of recesses (20b, 20c) of the impeller (20) are set so as to be the same as recessed shapes (50a, 50b) which take into account the amount of swelling of the group of recesses of the impeller.

Description

Petrolift

Technical field

The present invention relates to petrolift, in more detail, relate to and there is impeller and rotatably receive

The petrolift that holds the pump casing of this impeller.

Background technique

Known a kind of petrolift, it is as for example, for being supplied to the fuel in fuel tank in the device of internal-combustion engine (, motor of automobile etc.).In this petrolift, conventionally there is pump portion.Pump portion has shell and rotatably accommodates roughly discoid impeller in the enclosure.On the face relative with fuel suction side of impeller, along the peripheral part of impeller, with ring-type, be formed with blade slot part.On the face relative with fuel ejection side of impeller, the position corresponding at the blade slot part with being formed on suction side is formed with blade slot part.Being formed on the surface, suction side of impeller and the blade slot part on ejection side surface is communicated with in bottom.

On the suction side surface with impeller and the relative inner surface of outer cover of ejection side surface, go up separately, in the region relative with being formed on blade slot part on impeller, along the sense of rotation of impeller, be formed with from upstream extremity and extend to the pump path till downstream.The upstream extremity of the pump path of suction side is communicated with housing exterior by fuel suction port, and the downstream of the pump path of ejection side is communicated with housing exterior by fuel ejiction opening.

In the petrolift forming in the manner described above, if vane rotary, fuel is sucked in pump casing from suction port, and the fuel sucking is fed in the blade slot part and pump path of impeller.To being sucked into the fuel in pump casing, the centrifugal force that effect is caused by the rotation of impeller.Be sucked into fuel in the pump casing edge pump path that boosts due to the centrifugal force of impeller on one side and flow to downstream side, and the outside ejection from ejiction opening to pump casing.

In above-mentioned petrolift, the reduction for the ejection efficiency of the pump that prevents from causing due to leakage loss that the gap location between the slip surface of the surface at impeller and the pump cover being in contact with it, pump pedestal occurs, is made as very little by the gap of thrust direction.Therefore, if because the rotation of blade groove causes that fuel pressure in pump chamber is along with rising towards pump chamber outlet from fuel suction port, due near the pressure imbalance between near the fuel suction port pump chamber outlet on pump casing and on pump casing, on one side cause impeller contact to pump casing export relative position with pump chamber in rotate.

Therefore, known following technology, that is, in order to prevent this contact, near the pump discharge of the slip surface of pump casing, form the gap larger than the micro-gap between the surface of impeller and pump casing, thereby form yielding portion.(for example,, with reference to patent documentation 1.）

Patent documentation 1: No. 5-187382, Japanese kokai publication hei

Summary of the invention

Inventor by experiment, checking, the size distortion that confirms impeller appears in sets of recesses significantly.Therefore,, in order to prevent contacting of pump casing and impeller, only utilize hardly in the yielding portion shown in patent documentation 1 and just address the above problem completely.

The present invention In view of the foregoing proposes, its object is, a kind of petrolift is provided, and this petrolift is with simple and inexpensive structure, prevent the increase of the rotational resistance of impeller, the generation of the problems such as locking of pump chamber, taken into account reliability guarantee maintain with pump performance.

The petrolift the present invention relates to, it has: discoid impeller, shell, its by the pump housing and the pump cover of rotatably accommodating this impeller form, and motor part, it rotarilys actuate described impeller, tow sides at described impeller are gone up separately, from periphery, separate to the inside predetermined distance, along in the region of circumferentially extending, be formed on the sets of recesses that week upwards repeats, on the pump cover with described impeller vis-a-vis, in the relative region of the sets of recesses with impeller, formation extends to the 1st groove till downstream from upstream extremity, on the pump housing relative with described impeller reverse side, in the relative region of the sets of recesses with impeller, formation extends to the 2nd groove till downstream from upstream extremity, on described shell, form fuel ejiction opening and fuel suction port, this fuel ejiction opening makes to be communicated with housing exterior near the downstream of described the 1st groove, this fuel suction port makes to be communicated with housing exterior near the upstream extremity of the 2nd groove, when the sense of rotation from described impeller is observed, between the upstream extremity and downstream of the 1st groove of described pump cover, and be provided with separately sealed department between the upstream extremity of the above-mentioned pump housing and downstream, in this petrolift, at least one sealed department relative with sets of recesses described impeller position at described shell, being formed with prediction has the swelling of the sets of recesses of described impeller, micron-sized concave shape.

The effect of invention

According to petrolift of the present invention, can access a kind of petrolift, this petrolift is with simple and inexpensive structure, prevents the increase of the rotational resistance of impeller, the generation of the problems such as locking of pump chamber, taken into account reliability guarantee maintain with pump performance.

Above-mentioned or other objects of the present invention, feature, effect, the detailed description relating to by following mode of execution and the record of accompanying drawing, can become clearer.

Accompanying drawing explanation

Fig. 1 means the integrally-built sectional arrangement drawing of the petrolift of embodiments of the present invention 1.

Fig. 2 is the sectional arrangement drawing having amplified after the pump portion of Fig. 1.

Fig. 3 is the plan view of the impeller in embodiments of the present invention 1.

Fig. 4 is the plan view of the pump housing of observing from impeller side of embodiments of the present invention 1.

Fig. 5 is the plan view of the pump cover of observing from impeller survey of embodiments of the present invention 1.

Fig. 6 is the part sectioned view of the pump portion 12 in embodiments of the present invention 1.

Embodiment

Mode of execution 1

With reference to Fig. 1～Fig. 6, embodiments of the present invention 1 are described.

In addition,, in each figure, same numeral represents identical or considerable part.

If summarize feature of the present invention, be exactly on the slip surface of the inner surface of outer cover relative with impeller blade groove group, sealed department office when observing from vane rotary direction till from fuel ejiction opening to fuel suction port, is formed with the roughly circle-shaped concave shape that gap is further amplified with micron order.

Fig. 1 means the integrally-built sectional arrangement drawing of the petrolift of embodiments of the present invention 1, and as shown in Figure 1, petrolift 10 consists of motor part 70 and pump portion 12.

Motor part 70 has housing 72, engine casing (Eng Cas) 73, magnet 74,75 and rotor 76.Housing 72 forms roughly cylindric.Engine casing (Eng Cas) 73 is by being made as up and down the upper and lower of petrolift 10 by the upper end 72a(of housing 72 by Fig. 1) rivet to the inside and be fixed on housing 72.On engine casing (Eng Cas) 73, be formed with the ejiction opening 73a of opening upward.Magnet 74,75 is fixed on the inwall of housing 72.Rotor 76 has: the main body 77 consisting of laminated iron core and winding etc.; And the axle 78 that main body 77 edges are run through up and down.The upper end portion 78a of axle 78 is rotatably installed in engine casing (Eng Cas) 73 via bearing 81.The underpart 78b of axle 78 is rotatably installed in the pump cover 14 of pump portion 12 via bearing 82.At this, motor part 70 is structures identical with existing petrolift, therefore, omits more detailed description.

Fig. 2 amplifies the pump portion extraction of Fig. 1 to represent.

Pump portion 12 has shell 18 and impeller 20.

As shown in Figure 3, impeller 20 is roughly discoid.On the surface of the fuel suction side of impeller 20, from outer circumferential face, 20e separates predetermined distance, with ring-type, is formed with at the 1st continuous blade groove group 20b that makes progress in week.That is, the 1st blade groove group 20b separates with the outer circumferential face 20e of impeller 20 by the periphery wall 20d of impeller 20.Fuel at impeller 20 sprays on the surface of side, the position that lip-deep the 1st blade groove group 20b is corresponding in the suction side with being formed on impeller 20 (, the region that separates predetermined distance from outer circumferential face 20e), with ring-type, be formed with at the 2nd continuous blade groove group 20c that makes progress in week.In addition, the bottom of the 1st blade groove group 20b is communicated with by intercommunicating pore (omitting diagram) with the bottom of the 2nd blade groove group 20c.At the central part of impeller 20, be formed with the card complex hole 20a connecting on thickness direction, the section of the square with the axis direction of this card complex hole 20a is D word shape roughly.In card complex hole 20a, engaging has axle 78.If the winding energising to rotor 77, axle 78 rotations, impeller 20 rotation thus.

Shell 18 is that pump cover 14 and the pump housing 16 combine.As shown in Fig. 2, Fig. 5, upper on the surface (that is, the lower surface of Fig. 1) of the impeller side of pump cover 14, be formed with and overlook recess 14a rounded while observing.The diameter of the diameter of recess 14a and impeller 20 is roughly the same, and the thickness of the degree of depth of recess 14a and impeller 20 is roughly the same.

In recess 14a, rotatably embed and have impeller 20.

In the bottom surface of the recess 14a of pump cover 14, (following, to be sometimes referred to as the lower surface of pump cover) is upper, in the region relative with the 2nd blade groove group 20c of impeller 20, is formed with along the 2nd pump path 31 of the groove shape circumferentially extending.The upstream extremity 31a of the 2nd pump path 31 is formed near the position relative with the upstream extremity 30a of the 1st pump path 30 described later.

At the downstream 31b of the 2nd pump path 31, be formed with fuel ejiction opening 41.

Fuel ejiction opening 41 extends to the upper surface (upper surface of Fig. 1) of pump cover 14 from the 2nd pump path 31, the 2nd pump path 31 is communicated with shell 18 outsides (being housing 72 inside in detail).

Between impeller 20 and the recess 14a of pump cover 14, be formed with the axial micro-gap A shown in Fig. 6, in addition, between the inner peripheral surface 14b of the recess 14a of impeller 20 and pump cover 14, be formed with the micro-gap B radially shown in Fig. 6.These gaps A, B arrange for impeller 20 is successfully rotated.

In addition, in the drawings, schematically the gap of impeller 20 and pump cover 14 is widely illustrated, but actual be a few μ m～tens μ m left and right.

At the upper surface of the pump housing 16, in the region relative with the 1st blade groove group 20b of impeller 20, be formed with along the 1st pump path 30 of the groove shape circumferentially extending.Upstream extremity 30a at the 1st pump path 30 is provided with fuel suction port 40.Between the upstream extremity 30a and downstream 30b of the 1st pump path 30, be provided with the exhaust port 30c that the pump housing 16 is run through along upper and lower (Fig. 1's is upper and lower).Central part at the pump housing 16 is formed with recess 16b, in recess 16b, disposes with one heart thrust-bearing 33 with axle 78.

The thrust load of thrust-bearing 33 bear rotor 76.

The shell 18 consisting of pump cover 14 and the pump housing 16, is by under the state in the recess 14a impeller 20 being packed into pump cover 14, and the lower end 72b of housing 72 is riveted to the inside and is fixed on housing 72.

In addition, at shell 18, be fixed under the state on housing 72, the underpart 78b of axle 78 is comparing position more on the lower with the position of being supported by bearing 82, in the chimeric card complex hole 20a that is inserted in impeller 20.Between the lower end of axle 78 and the pump housing 16, thrust-bearing 33 is installed.

In the petrolift 10 forming in the manner described above, if current direction rotor 76 and impeller 20 rotations, the fuel in fuel tank (omitting diagram) is sucked in shell 18 by fuel suction port 40.Be sucked into the fuel in shell 18, first, flow into the upstream extremity 30a of the 1st pump path 30.As shown in Figure 6, flow into the fuel in the 1st pump path 30, due to the rotation of impeller 20, between the 1st pump path 30 and the 1st blade groove group 20b, form eddy flow S, boost thus.In addition, flow into the fuel in the 1st pump path 30, due to the rotation of impeller boost and meanwhile in the 1st pump path 30, from upstream extremity 30a, flow to downstream 30b.Then, the fuel ejiction opening 41 forming from downstream at the 2nd pump path 31 is to the fuel of motor part 70 ejections, flows motor part 70 is interior, from being formed on ejiction opening 73a engine casing (Eng Cas) 73 to the outer ejection of petrolift 10.

Above-mentioned axial micro-gap A shown in Figure 6 is one of the main cause that affects significantly the discharge performance of petrolift 10.That is, if gap is wider,, when hindering described eddy flow S smooth mobile, the leakage loss in shell 18 increases, and its result causes the decline of the fuel spray volume that sprays from fuel ejiction opening 41.That is, above-mentioned gap being maintained, managed as minimum, is being extremely important problem aspect the discharge performance of holding pump.On the other hand, impeller 20 is that the resin material by thermosetting property or thermoplasticity etc. forms, but known above-mentioned impeller 20 always uses with the state being immersed in fuel conventionally, therefore, and because moisture absorption causes dimensional changes (swelling).

In the situation that the swelling causing due to moisture absorption approaches the gap A arranging in the axial direction, because hindering, the interference of impeller and shell rotatablely moves, thereby spin friction resistance increases, cause the ejection decrease in efficiency of petrolift, in the further swelling of impeller 20, surpass the in the situation that of setting gap A, the worst situation likely causes the locking of pump chamber.According to above-mentioned background, in the situation that expect the swelling that causes impeller due to fuel dipping, need under the degree of locking etc., gap be set, manage littlely not occurring.

In thering is the form of the 20g of foreign steamer portion shown in Fig. 3, particularly, in the impeller 20 of thermosetting resin, have with other positions (planar surface portion, peripheral part 20e) and compare, the larger feature of swelling at blade part 20f place.In present embodiment 1, be conceived to above-mentioned feature, in the inside of shell 18, the position relative with the 20f of impeller blade portion on slip surface is provided with the concave shape of having estimated swelling.

Particularly, pump path 30,31 with respect to the roughly C word shape arranging on the slip surface at the pump housing 16 and pump cover 14, in the direction along they being extended with circumferencial direction, in other words, on the sealed department arranging between the upstream extremity 30a of pump path 30,31 and downstream 30b and upstream extremity 31a and downstream 31b, be provided with swelling, the micron-sized concave shape 35,36 of having estimated impeller 20, and carried out local gap and amplified.

According to the petrolift of the embodiments of the present invention 1 according to forming with upper type, even when blade part 20f swelling, the rotational resistance that also can prevent impeller 20 increases or the problem such as pump chamber locking occurs.Meanwhile, due to the region of having amplified gap is only defined in to necessary region, therefore, pump discharge performance can not decline to a great extent, that is, can take into account reliability guarantee maintain with pump performance.

In addition, in the above description, situation about being formed on separately on the pump housing 16 and pump cover 14 for the concave shape 35,36 forming on the internal surface at shell 18 is illustrated, but also can only be formed on any one party.

In addition, with above-mentioned mode of execution on the contrary, as shown in Figure 6, even pre-concave shape 50a, the 50b in respect of swelling is arranged on to impeller side, also can expect same effect.

In addition, in the petrolift 10 of above-mentioned mode of execution 1, at the pump housing 16 and pump cover 14 or be only formed with concave shape on impeller 20, therefore, existing structure (parts) also can be used in other positions.

Above, use mode of execution 1 to describe concrete example of the present invention in detail, but these are nothing but illustration, do not limit claims.In the technology of recording, comprise the content that the concrete example to exemplifying has above carried out various distortion, change in claims.

In addition, illustrated technology essential factor in this specification or accompanying drawing, brings into play technical validity by independent or various combinations, the combination that the claim while being not limited to apply for is recorded.In addition, illustrative technology in this specification or accompanying drawing realizes a plurality of objects simultaneously, the technological scheme that realizes one of them object validity that possesses skills itself.

Industrial applicibility

The present invention is as for example, being effective for the fuel in fuel tank being supplied to the petrolift of internal-combustion engine (, motor of automobile etc.).

The explanation of label

10: petrolift, 12: pump portion, 14: pump cover, 6: the pump housing,

18: shell, 20: impeller,

20b: the 1st blade groove group (sets of recesses),

20c: the 2nd blade groove group (sets of recesses), 30,31: pump path,

30a: the upstream extremity of pump path 30,30b: the downstream of pump path 30,

31a: the upstream extremity of pump path 31,31b: the downstream of pump path 31,

35: concave shape (pump housing side), 36: concave shape (pump cover side),

40: fuel suction port, 41: fuel ejiction opening,

50a, 50b: concave shape (impeller side),

70: motor part, 72: housing, 73: engine casing (Eng Cas),

74,75: magnet,

76: rotor, 78: axle.

Claims

1. a petrolift (10), it has: discoid impeller (20); Shell (18), it consists of the pump housing (16) and the pump cover (14) of rotatably accommodating this impeller; And motor part (70), it rotarilys actuate described impeller,

Tow sides at described impeller (20) are gone up separately, from periphery, separate to the inside predetermined distance, in the region along circumferentially extending, are formed on the sets of recesses (20b, 20c) that week upwards repeats,

Upper at the pump cover (14) with described impeller vis-a-vis, in the relative region of the sets of recesses with impeller (20c), form from upstream extremity (31a) and extend to the 1st groove (31) till downstream (31b),

Upper at the pump housing (16) relative with described impeller reverse side, in the relative region of the sets of recesses with impeller (20b), form from upstream extremity (30a) and extend to the 2nd groove (30) till downstream (30b),

In upper fuel ejiction opening (41) and the fuel suction port (40) of forming of described shell (18), this fuel ejiction opening (41) makes to be communicated with shell (18) outside near the downstream (31b) of described the 1st groove (31), this fuel suction port (40) makes to be communicated with shell (18) outside near the upstream extremity (30a) of the 2nd groove (30)

When sense of rotation from described impeller is observed, between the upstream extremity of the 1st groove (31) of described pump cover (14) and downstream and between the upstream extremity of the above-mentioned pump housing (16) and downstream, be provided with separately sealed department,

This petrolift is characterised in that,

In the relative position of at least one sealed department and sets of recesses described impeller (20b, 20c) of described shell (18), be formed with prediction have described impeller (20) sets of recesses (20b, 20c) swelling, micron-sized concave shape (35,36).

2. petrolift according to claim 1, is characterized in that,

At described pump cover (14) and the pump housing (16), be formed with described concave shape (35,36) on both.

3. petrolift according to claim 1, is characterized in that,

By the shape of the sets of recesses of described impeller (20) (20b, 20c), be made as the concave shape (50a, 50b) of the swelling of predicting the sets of recesses that has this impeller.

4. a petrolift (10), it has: discoid impeller (20); Shell (18), it consists of the pump housing (16) and the pump cover (14) of rotatably accommodating this impeller; And motor part (70), it rotarilys actuate described impeller,

When observing from described vane rotary direction, between the upstream extremity of the 1st groove (31) of described pump cover (14) and downstream and between the upstream extremity of the above-mentioned pump housing (16) and downstream, be provided with separately sealed department,

This petrolift is characterised in that,

The shape of the sets of recesses of described impeller (20) (20b, 20c) is made as to the concave shape (50a, 50b) of the swelling of predicting the sets of recesses that has this impeller.