CN100425822C

CN100425822C - Fluid pump having bearing hole

Info

Publication number: CN100425822C
Application number: CNB2006101290505A
Authority: CN
Inventors: 长田喜芳; 角谷慎司; 酒井博美
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2005-09-06
Filing date: 2006-09-05
Publication date: 2008-10-15
Anticipated expiration: 2026-09-05
Also published as: CN101368534A; CN100467850C; CN1928345A; CN100552209C; CN1928347A; CN101368534B; CN1928346A

Abstract

A fluid pump (10) includes a stationary part (30). A rotator (70) is rotatable around the inner circumferential periphery of the stationary part (30). One of the stationary part (30) and the rotator (70) includes at least one coil (42) that generates magnetic force between the stationary part (30) and the rotator (70) for rotating the rotator (70) when being supplied with electricity. A pump portion (12) is provided to one axial end of the rotation axis (72) of the rotator (70). A cover (50) covers the other axial end of the rotation axis (72) of the rotator (70) and the stationary part (30). The cover (50) defines an outlet passage (206) through which fluid is discharged from the pump portion (12). The cover (50) has a bearing hole (52) that rotatablely supports the other axial end of the rotation axis (72). The bearing hole (52) has a closed bottom. The cover (50) has a communication passage (220) that communicates the outlet passage (206) with the bearing hole (52).

Description

Fluid pump with bearing hole

Technical field

The present invention relates to a kind of fluid pump with bearing hole.

Background technique

According to the description of patent document US 2005/0074343 A1 (JP-A-2005-110478), petrolift comprises by the pump housing part of motor rotating force driving partly with pump fuel.In this structure, it is upper in the axial end of pump housing part opposition side that cover cap surrounds the motor part.The motor section branch comprises brushless electric machine.Have exhaust port on the cover cap, fuel is discharged through this exhaust port.Cover cap has bearing, and it is supporting the rotatingshaft of motor part rotor rotationally.

Cover cap has the bearing hole that is holding bearing.The bottom of bearing hole is blocked.In this structure, the fuel of taking in bearing hole may go bad, and the rotatingshaft fuel corrosion that may be metamorphosed.In addition, the foreign matters such as chip that produced by abrasion phenomenon in the petrolift may accumulate in the bearing hole.Therefore, these foreign matters for example may adhere in the sliding parts between rotatingshaft and the bearing.

Summary of the invention

Consider the problems referred to above and other problem, an object of the present invention is to make a kind of like this fluid pump: it has bearing hole, and fuel and foreign matter are restricted and can't be accumulated in the bearing hole.

According to an aspect of the present invention, fluid pump comprises static parts, ring periphery in it has.Fluid pump also comprises rotor, and it can encircle periphery and rotate in described.Rotor has rotatingshaft.In static part and the rotor one of have at least one coil.When to this at least one coil power supply, it produces magnetic force between static part and rotor, to be used for rotary rotor.Fluid pump also comprises pump housing part, and it is set on the axial end of axis of rotor rotation.Rotor is suitable for rotating pump housing part, to be used for pumping fluid.Fluid pump also comprises cover cap, and it is hiding another axial end of axis of rotor rotation.In a side of another axial end of rotatingshaft, cover cap is hiding static part.Cover cap has formed outlet passage, and fluid is discharged from pump housing part through this passage.Have bearing hole on the cover cap, it is supporting another axial end of rotatingshaft rotationally.Bearing hole has the bottom of sealing.Cover cap has communication passage, and this passage is communicated with outlet passage with bearing hole.

As alternative, bearing hole extends to the sealing axial end place in the cover cap basically vertically.With respect to the axial direction of bearing hole, the axial end of sealing can block bearing hole.

Description of drawings

From the detailed description of hereinafter doing, can be expressly understood foregoing of the present invention and other purpose, feature and advantage more with reference to accompanying drawing.In the accompanying drawings:

Vertical partial sectional view among Fig. 1 has been represented the petrolift according to first mode of execution;

Fig. 2 is the sectional view of being done along the II-II line among Fig. 1;

Fig. 3 is the sectional view of being done along the III-III line among Fig. 1;

Schematic sectional view has been represented the end cap according to the petrolift of second mode of execution among Fig. 4;

Schematic sectional view has been represented the end cap according to the petrolift of the 3rd mode of execution among Fig. 5; And

Sectional view among Fig. 6 has been represented the petrolift according to the 4th mode of execution.

Embodiment

(first embodiment)

As shown in Figure 1, the petrolift 10 in this mode of execution for example is a kind of turbine pump that is arranged in fuel tank.This petrolift 10 is set in the fuel tank of motorcycle, and the engine displacement of this motorcycle for example is 150cc.

Petrolift 10 comprises pump housing part 12 and motor part 13.Motor part 13 is rotated pump housing part 12.Housing 14 has played the effect of shell.Housing 14 is contained in pump housing part 12 and motor part 13 wherein.Carry out crimping processing and pump case 20 and end cap 50 is fixing by two axial ends to housing 14.End cap 50 has played the effect of cover cap.Hiding the thickness of the thickness of the part of stator iron core 30 outer circumferential periphery in the motor part 13 less than another part on the housing 14, wherein, another part is meant the part that has formed stepped part 15 in the pump housing part 12.Stator iron core 30 is as static parts.Needn't need housing 14 to form flux circuit.In this structure, can be thinned around the thickness of the housing 14 of stator iron core 30, thereby can reduce the external diameter of motor part 13.

Pump housing part 12 has played the effect of turbine pump.Pump housing part 12 comprises

pump case

20,22 and impeller 24.Pump case 22 abuts on the stepped part 15 of housing 14 in the axial direction, thereby realizes in the axial direction aligning.Bearing 26 be pressed onto pump case 22 in the heart.Carry out crimping and pump case 20 is fixing by a end to housing 14.Form axial force by flange crimping operation, produced pressure thus, this pressure is pressed onto pump case 22 and pump case 20 respectively on stepped part 15 and the pump case 22, thereby fuel encapsulation is got up.

Pump case

20,22 is holding the impeller 24 as the rotor member rotationally.Surrounded the pump channel 202 that is essentially C shape between

pump case

20,22 and the impeller 24.Fuel is sucked from the import 200 that is arranged on the pump case 20, and the rotation of impeller 24 is pressurizeed to fuel, makes its pump channel 202 of flowing through, thereby fuel pressure is sent to motor part 13., after flowing through fuel channel 204 and outlet passage 206, carried to motor the fuel of motor part 13 by force feed through exporting 208.Fuel channel 204 forms between stator iron core 30 and rotor 70.Outlet 208 is communicated with the external world of outlet passage 206 with end cap 50.Outlet 208 is with respect to bearing hole (bearing) the 52nd, and is eccentric.

Motor part 13 is brushless motors, and it comprises stator iron core 30, drum 40, coil 42 and rotor 70.Stator iron core 30 is that the iron core by six circumferential arrangement constitutes.A control gear that does not illustrate is in the drawings controlled the electric current that flows to coil 42 according to the pivotal position of rotor 70, changes the magnetic pole that perimembranous forms in iron core thus.The inner circumference periphery of iron core 32 and the outer circumferential periphery of rotor 70 are vis-a-vis.

As shown in Figure 2, each iron core 32 all has tooth portion 33 and peripheral part 34.Each iron core 32 all is to carry out crimping and handle and make one by some are stacked to together magnetic steel disc on the axial direction of rotating shaft 72.The effect of rotatingshaft has been played in rotating shaft 72.Tooth portion 33 from the inside projection in the center of peripheral part 34 to rotor 70.Each drum 40 of being made by electric insulation resin engages with each iron core 32.Six peripheral parts have formed the iron core of anchor ring.Each peripheral part 34 all is essentially arc, and on ring Zhou Fangxiang, the width of these arcs is uniform substantially.

Each iron core in six iron cores 32 before being arranged on the stator iron core 30 by ring allly, and each iron core is single parts, with this understanding, by with lead with one heart around on the outer circumferential periphery of each iron core 32 drums 40, making each coil 42.As shown in Figure 1, each coil 42 all is connected with two terminal, 44,45 holding circuits that are positioned at end cap 50 1 sides.Terminal 44 are drawn out to the outside of end cap 50 from the connecting part that is connected with coil 42 conductions, thereby expose outside the end cap 50.Terminal 44 are connected with connector.Terminal 45 do not expose from end cap 50.Terminal 45 are connected with each other on circuit with coil 42.

Center at end cap 50 forms bearing hole 52.Leaving the substantially position of same distance with bearing hole 52,

terminal

44,45 are inserted in the end cap 50 moldedly, guaranteeing that leaving housing 14 has certain distance, thereby have guaranteed and the metal shell 14 that is positioned at radial outside is realized insulation.Terminal 44 have been carried out bending, so that terminal 44 are drawn out to the outside and are in such exposed uncovered positions from end cap 50 inside: with respect to the position of terminal 44 in end cap 50 inside, this position is in radial outside.

Terminal 44 are bent into and make its exposed uncovered positions be positioned at radial outside with respect to its position in end cap 50 inside.Outlet 208 is eccentric with respect to bearing hole 52, thereby the outlet 208 and the center of end cap 50 are separated.Thereby the terminal 44 that are exposed to outside end cap 50 surfaces can separate with outlet 208.

Herein, bearing hole 52 can be coaxial with respect to opening in end cap 50 outlets 208 lip-deep, outlet passage 206.That is to say, outlet 208 can be formed at the center of end cap 50.In this structure, if be set on end cap 50 surfaces of outlet 208 places such as terminal 44 parts such as grade, perhaps as alternative: if these parts are drawn out to except that the part place that exports 208 by the inside from end cap 50, then terminal 44 and the distance of outlet between 208 be possibly less than the radius of end cap 50, even be separated from each other at the most.Thereby outlet 208 will be very little with the distance of other parts oneself, especially in small-sized petrolift.Therefore, be used for the space that terminal 44 and connector are coupled together or be used for the space that elements such as outlet 208 and pipeline couple together has for example just been diminished.Thereby, be used for the manufacturing work that petrolift and other parts couple together has just been become difficulty.

In contrast, in this embodiment, the outlet 208 of outlet passage 206 is eccentric with respect to bearing hole 52, thereby the outlet 208 and the center of end cap 50 are separated.Thereby, be arranged in end cap 50 lip-deep, just can separate such as the parts of terminal 44 etc. with outlet 208.As alternative, when parts were drawn out to except that the position of outlet 208 by the inside from end cap 50, this position can separate with outlet 208.

Thereby the terminal 44 that are exposed to outside end cap 50 surfaces can separate with outlet 208.Thereby, be convenient to terminal 44 and connector are coupled together, also be beneficial to simultaneously elements such as outlet 208 and pipeline are coupled together.

This structure of this mode of execution is particularly useful for small-sized petrolift.

Be filled with the resin material 46 of electrical insulation between circumferentially adjacent tooth portion 33, the resin material 46 that is molded into electrical insulation is thus hiding coil 42.The resin material 46 of electrical insulation is integrally molded with end cap 50, and wherein, end cap 50 is hiding an end of stator iron core 30, and this end is positioned at the opposition side of pump housing part 12 with respect to stator iron core 30.The resin material 46 of electrical insulation can be polyphenylene sulfide (PPS) or polyoxymethylene (POM).End cap 50 is by electric insulation resin material 46 molded forming, and formed the supporting part of bearing hole 52, terminal 44 and exported 208, and wherein, bearing hole is supporting rotating shaft 72 rotationally.Electric insulation resin material 46 is integrally molded with end cap 50, thereby can reduce the constituent elements number of petrolift 10, and the workload that can reduce to assemble petrolift 10.

End cap 50 has and is positioned at the bearing hole 52 that the center is used for rotational support rotating shaft 72.Bearing hole 52 is directly supporting rotating shaft 72.Got up by shutoff in the bottom of bearing hole 52.End cap 50 has the outlet passage 206 that is in eccentric position with respect to bearing hole 52.Outlet passage 206 penetrates end cap 50 as the crow flies along the axial direction of end cap basically.Outlet passage 206 and bearing hole 52 are directly overlapping, thereby outlet passage 206 is communicated with bearing hole 52.

Deflection limiting member 60 is essentially annular, and the center has formed a through hole.Deflection limiting member 60 clasp joints are to drum 40 ends that are positioned at pump housing part 12 opposition sides.Deflection limiting member 60 has pilot hole, and

terminal

44,45 are assembled in these pilot holes.Under the situation that

terminal

44,45 are assembled in the pilot hole, the resin material 46 of electrical insulation is performed molding, thereby when electric insulation resin material 46 during by molding, can limit the deflection of

terminal

44,45, and forms with on every side parts and to interfere.

As shown in Figure 1, 2, rotor 70 comprises rotating shaft 72 and permanent magnet 74.Rotor 70 can rotate around the inner circumference periphery of stator iron core 30.One end of rotating shaft 72 is being supported rotationally by bearing 26, and the other end is being supported rotationally by bearing hole 52.Permanent magnet 74 is resin magnets, and it is by mixing and be shaped to cylindrical making with magnetic and polyphenylene sulfide thermoplastic resins such as (PPS).Have decorative pattern on the outer circumferential periphery of rotating shaft 72, utilize methods such as injection moulding that permanent magnet 74 is directly made on the outer circumferential periphery of rotating shaft.Permanent magnet 74 has eight magnetic poles 75, and these magnetic poles are arranged with respect to the sense of rotation of rotor 70.Eight magnetic poles 75 are geomagnetic on the outer circumferential periphery relative with stator iron core and have formed magnetic pole.With respect to the sense of rotation of rotor 70, magnetic pole is different each other.

End cap 50 has outlet 208, and valve member 80, blocking 82 and spring 84 are being held in this outlet 208, and these members have constituted check valve.Thereby end cap 50 is also as the check valve housing, thereby, can reduce the number of the composition member of petrolift 10 and the workload that can reduce to assemble petrolift 10.

If the pressure of the fuel of pressurization becomes more than or equal to predetermined pressure in pump housing part 12, valve member 80 just will overcome the bias force of spring 84 and lift, thereby fuel can be carried to motor through exporting 208 discharges.The fuel generation adverse current that valve member 80 restrictions are discharged from petrolift 10.

In the first embodiment, end cap 50 has formed the axial end of sealing.Bearing hole 52 extends to the sealing axial end place in the end cap 50 basically vertically.The axial end of sealing can be disposed between outlet 208 and the bearing hole 52.On the axial direction of bearing hole 52, the axial end of sealing is with bearing hole 52 sealings.

In the first embodiment, bearing hole 52 is communicated with outlet passage 206, the bearing hole 52 thereby fresh fuel can be flowed through.Thereby, the fresh fuel sliding parts between rotating shaft 72 and the bearing hole 52 of will flowing through.In this structure, can prevent that fuel from going bad owing to being accumulated between rotating shaft 72 and the bearing hole 52, thereby, can protect rotating shaft 72, make it avoid being subjected to the rotten influence of fuel and corrode.Thereby, can keep the suitable sliding sliding properties of bearing hole 52 with respect to rotating shaft 72.Even the foreign matters such as chip that produced by abrasion flow in the bearing hole 52, it also can flow out immediately and flow to outlet passage 206, thereby can prevent that foreign matter from adhering between bearing hole 52 and the rotating shaft 72.Thereby, can keep the suitable sliding sliding properties of bearing hole 52 with respect to rotating shaft 72.

In the first embodiment, outlet 208 is eccentric with respect to bearing hole 52.Outlet passage 206 with outlet 208 directly overlaps with bearing hole 52, thereby outlet passage 206 is communicated with bearing hole 52.In this structure, bearing hole 52 and outlet passage 206 have also played the effect of communication passage, and they can be interconnected easily.

Outlet passage 206 is formed lineal shape basically.Thereby, after being molded into end cap 50, can in the opposite direction the mutual drawing of molded pattern be opened.Thereby usable resins is made end cap 50 integratedly.

In the first embodiment, coil 42 is to be made of the concentrated winding around each iron core 32 tooth portions 33, thereby, for example to compare with the structure of Distributed Winding, the occupancy of winding is improved.Thereby under the constant situation of number of turns, coil 42 occupied winding spaces are reduced.Thereby motor part 13 can be reduced, thereby can dwindle the volume of petrolift 10.

In this embodiment, bearing hole 52 is directly supporting rotating shaft 72, thereby can reduce the number of petrolift 10 constituent elementss, and can alleviate the assembly working amount of petrolift 10.

In addition, between circumferentially adjacent tooth portion 33, be filled with the resin material 46 of electrical insulation, molded of resin material can be become hiding coil 42 thus.Thereby, by adopting simple structure, make coil 42 be subjected to protection, avoided being corroded, and prevented that coil 42 is exposed in the foreign matter owing to being exposed in the fuel.In addition, electric insulation resin material 46 can make it avoid deforming in winding process to being protected by the coil 42 of concentrating winding to constitute.

(second, third and the 4th mode of execution)

As shown in Figure 4, in second mode of execution, end cap 100 has formed bearing hole 102.Bearing hole 102 and outlet passage 206 directly do not overlap.Bearing hole 102 is separated from each other diametrically with outlet passage 206.Got up by shutoff in the bottom of bearing hole 102.Bearing hole 102 is realized being communicated with outlet passage 206 by communication passage 220.

As shown in Figure 5, in the 3rd mode of execution, end cap 110 has formed bearing hole 112, and bearing hole 112 is located substantially on the same axis 120 with the outlet 208 of outlet passage 206.Bearing hole 112 and outlet passage 206 directly do not overlap.Bearing hole 112 and outlet passage 206 are separated from each other diametrically.Got up by shutoff in the bottom of bearing hole 112.Bearing hole 112 is realized being communicated with outlet passage 206 by communication passage 220.

As shown in Figure 6, in the petrolift 130 of the 4th mode of execution, end cap 132 has formed bearing hole 134, and interference has press-fited metal bearing 140 in this bearing hole.Metal bearing 140 is the parts that separate with end cap 132, and end cap 132 is formed by resin molded.End cap 132 is to form with the resin material 46 of electrical insulation is molded integratedly.Rotating shaft 72 is being supported rotationally by bearing 26 and bearing 140.Consider resistance problem, bearing 140 can be made by the Cuprum alloy or the material with carbon element of sintering.

Bearing hole 134 is formed at the center portion of end cap 132.Got up by shutoff in the bottom of bearing hole 134.Outlet passage 206 is eccentric with respect to bearing hole 134.Outlet passage 206 directly overlaps with bearing hole 134, and is interconnected.In this structure, the fresh fuel bearing hole 134 of flowing through, thereby, the fresh fuel sliding parts between rotating shaft 72 and the bearing 140 of will flowing through.Like this, just can prevent that fuel from going bad owing to being accumulated between rotating shaft 72 and the bearing 140, and then can protect rotating shaft 72, make it avoid the corrosion of rotten fuel.Thereby, can keep the suitable sliding sliding properties of bearing 140 with respect to rotating shaft 72.Even the foreign matters such as chip that produced by abrasion flow in the bearing hole 134, it also can flow out immediately and flow to outlet passage 206, thereby can prevent that foreign matter from adhering between bearing 140 and the rotating shaft 72.Thereby, can keep the suitable sliding sliding properties of bearing 140 with respect to rotating shaft 72.

(other mode of execution)

In the above-described embodiment, in the motor part of petrolift, use brushless electric machine, be used to produce the driving force of driving fuel pump pump housing part.Brushless electric machine can not produce the loss that occurs in the commutator machine, and this loss is owing to following former thereby occur: exist the groove place that has resistance between slip resistance, commutator and the brush, commutator is divided into section to produce fluid resistance between commutator and the brush.Thereby aspect electric efficiency, brushless electric machine is better than commutator machine, thereby can improve the efficient of petrolift.The efficient of petrolift is petrolift acting amount of sending and the ratio that flows to the electric power of petrolift, and wherein, the acting amount of petrolift is (fuel head pressure) * (fuel discharge capacity).The situation that has the motor (commutator machine) of brush with application is compared, and by using brushless electric machine, under the constant situation of acting amount, along with the raising of petrolift efficient, the size of motor part can be reduced, thus the size that can dwindle petrolift.Thereby, preferably, make petrolift realize miniaturization, especially for the situation of motorcycle by adopting brushless electric machine.

But,, can in pump housing part, use commutator machine as alternative.Be communicated with outlet passage by the bearing hole that will be formed in the end cap and its bottom blocking gets up,, can prevent that also fuel and foreign matter are accumulated in the bearing hole even adopted commutator machine.Thereby, can keep the suitable sliding sliding properties of bearing hole with respect to rotating shaft.

Can be by a plurality of resin component elements be welded the end cap that forms one, but not with resin material molded end cap integratedly.If end cap has been made unnecessary aperture integratedly, then can utilize sealing plug that unnecessary aperture is closed.Available other material except that resin is made end cap integratedly.That is to say that end cap for example available metal is made.

In above-mentioned a plurality of mode of executions, encircled and arranged that with each tooth portion that forms stator iron core be parts separately week.As alternative, tooth portion also can be made into one, so that tooth portion upwards arranged in week.

In above-mentioned a plurality of mode of executions, pump housing part 12 is to be made of the turbine pump that comprises impeller 24.As alternative, pump housing part can be by the pump with other structure-for example gear pump constitutes.

The said structure of various mode of executions can be combined suitably.

In the above-described embodiment, the structure of relevant rotating shaft, bearing hole and end cap is applied in the petrolift.But above-mentioned structure is not limited to the application on petrolift.Above-mentioned structure also can be applied to the fluid pump of other type.

Under prerequisite not, can make the change and the replacement of various ways to above-mentioned mode of execution departing from essential idea of the present invention.

Claims

1, a kind of fluid pump (10,130), it comprises:

Static part (30), it has the inner circumference periphery;

Rotor (70), it can rotate around described inner circumference periphery, and rotor (70) has rotatingshaft (72);

Wherein, in static part (30) and the rotor (70) one of comprise at least one coil (42),

When described at least one coil (42) is powered, it produces magnetic force between static part (30) and rotor (70), to be used for rotary rotor (70);

Fluid pump (10,130) also comprises:

Pump housing part (12), it is set on the axial end of rotatingshaft (72) of rotor (70), and rotor (70) is suitable for rotating pump housing part (12), to be used for pumping fluid;

Cover cap (50,100,110,132), it is hiding another axial end of the rotatingshaft (72) of rotor (70), cover cap (50,100,110,132) is hiding the static part (30) of another axial end one side that is positioned at rotatingshaft (72), cover cap (50,100,110,132) has formed outlet passage (206), fluid is discharged from pump housing part (12) through this passage

Wherein, have bearing hole (52,102,112,134) on the cover cap (50,110,110,132), it is supporting another axial end of rotating rotatingshaft (72);

Bearing hole (52,102,112,134) has the bottom of sealing; And

Cover cap (50,100,110,132) has communication passage (220), and this communication passage is communicated with outlet passage (206) with bearing hole (52,102,112,134).

2, fluid pump according to claim 1 (10,130) is characterized in that:

Described at least one coil (42) comprises a plurality of coils (42);

Static part (30) comprises a plurality of tooth portions (33), and these tooth portions are along circumferential arrangement;

Each coil in a plurality of coils (42) all is by forming on each the outer circumferential periphery that the lead concentrated area is wound into a plurality of tooth portions (33);

When by the feed electric current, a plurality of coils (42) encircle on the inner circumference periphery of a plurality of tooth portions (33) and form magnetic pole allly;

By the electric current that flows to a plurality of coils (42) is controlled converted magnetic pole;

The outer circumferential periphery of rotor (70) is relative with the inner circumference periphery of a plurality of tooth portions (33); And

With respect to the sense of rotation of rotor (70), the outer circumferential periphery of rotor (70) has formed mutually different magnetic pole.

3, fluid pump according to claim 1 and 2 (10) is characterized in that:

Cover cap (50,100,110) is formed from a resin;

Bearing hole on the cover cap (50,100,110) is directly supporting rotatingshaft (72); And

Rotatingshaft (72) can rotate with respect to cover cap (50,100,110).

4, fluid pump according to claim 1 and 2 (130) is characterized in that: also comprise:

Metal bearing (140), it is the parts that separate with cover cap (132);

Wherein, cover cap (132) is formed by resin;

Metal bearing (140) is pressed onto in the bearing hole (134); And

Metal bearing (140) is supporting rotating rotatingshaft (72).

5, fluid pump according to claim 1 and 2 (10,130) is characterized in that: cover cap (50,100,110,132) forms with resin.

6, fluid pump according to claim 1 and 2 (10,130) is characterized in that: outlet passage (206) has the outlet (208) eccentric with respect to bearing hole (52,102,134).

7, fluid pump according to claim 6 (10,130) is characterized in that:

Communication passage is overlapped by bearing hole (52,102,112,134) and outlet passage (206) and forms; And

Make bearing hole (52,102,112,134) be communicated with outlet passage (206).

8, fluid pump according to claim 1 and 2 (10,130) is characterized in that:

Bearing hole (52,102,112,134) extends to the sealing axial end place in the cover cap (50,100,110,132) basically vertically; And

With respect to the axial direction of bearing hole (52,102,112,134), the axial end of sealing blocks bearing hole (52,102,112,134).

9, a kind of fluid pump (10,130) comprising:

Static part (30), it has the inner circumference periphery;

Wherein, in static part (30) and the rotor (70) one of have at least one coil (42),

Fluid pump (10,130) also comprises:

Pump housing part (12), it is set on the axial end of rotor (70) rotatingshaft (72), and rotor (70) is suitable for rotating pump housing part (12), to be used for pumping fluid; And

Cover cap (50,100,110,132), it is hiding another axial end of rotor (70) rotatingshaft (72), cover cap (50,100,110,132) is hiding the static part (30) of another axial end one side that is positioned at rotatingshaft (72), cover cap (50,100,110,132) has formed outlet passage (206), fluid is discharged from pump housing part (12) through this outlet passage

With respect to the axial direction of bearing hole (52,102,112,134), the axial end of sealing blocks bearing hole (52,102,112,134); And

10, fluid pump according to claim 9 (10,130) is characterized in that: communication passage (220) is positioned at a side of bearing hole (52,102,112,134) with respect to the axial end of sealing.