CN105443397A - Electronic pump - Google Patents
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- CN105443397A CN105443397A CN201410495854.1A CN201410495854A CN105443397A CN 105443397 A CN105443397 A CN 105443397A CN 201410495854 A CN201410495854 A CN 201410495854A CN 105443397 A CN105443397 A CN 105443397A
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Abstract
Disclosed is an electronic pump. The electronic pump comprises a first shell body, a separation sleeve, a second shell body, a rotor component and a stator component. The rotor component comprises an impeller, a pump shaft and a rotor. The first shell body and the second shell body are arranged oppositely in a sealed mode to form the inner cavity of the electronic pump. The electronic pump further comprises an axial limiting device which is used for limiting axial motion of the impeller toward the first tail end of the pump shaft. The impeller comprises vanes and a rear impeller covering plate. The electronic pump further comprises an axial force balance structure which comprises a pressure discharging hole penetrating through the rear impeller covering plate. The pressure discharging hole is communicated with a low-pressure area where an inlet is located and a high-pressure area where the rotor is located. The axial force balance structure further comprises a convex ring and an annular groove. The convex ring is formed in the position, close to an outlet, of the rear impeller covering plate and in the reverse direction toward the inlet. The annular groove is formed in the second shell body in correspondence with the convex ring. The convex ring is inserted in the inner cavity of the annular groove. In this way, the axial force balance structure is arranged, so that axial thrust and part abrasion are reduced, and the service life of is prolonged.
Description
[technical field]
The present invention relates to a kind of centrifugal pump, be specifically related to a kind of electric drive centrifugal pump.
[background technique]
Usually, electronic pump is used for transporting fluid working medium.Working medium in pump is driven by impeller and rotates together, is thrown toward the edge of pump case under the influence of centrifugal force, thus produces certain pressure, then flows out from outlet or pipeline; Then because working medium is thrown out of, pressure reduces for the center of impeller, and the working medium of upstream is inhaled in pump cavity through water pipe under the differential pressure action at the import of pump cavity and the center of impeller.Therefore, transporting of working medium is just achieved.The impeller of electronic pump is connected with rotor, when rotor is driven by the electromagnetic force existed between rotor and stator and rotates, rotates with regard to impeller.
During electronic pump work, the ingress of pump cavity is low pressure area, and outlet port is zone of high pressure, there is the first gap between front shroud of impeller and pump case, there is the second gap between back shroud of impeller and pump case.First gap is communicated with zone of high pressure and low pressure area simultaneously, and the second gap is but only connected with zone of high pressure.Like this, the pressure that front shroud of impeller is subject to reduces near ingress gradually Zi near outlet port, but the always high pressure that the whole surface of back shroud of impeller is subject to.Like this, the pressure that back shroud of impeller is subject to is greater than front shroud of impeller, just produce one to make a concerted effort to make impeller be pushed to pump intake place, make impeller and device (as: jump ring, bearing etc.) the forcing together tightly for axial limiting, produce larger frictional force, loss of energy, also can reduce the life-span of associated components simultaneously.
Therefore, be necessary to improve existing technology, to solve above technical problem.
[summary of the invention]
The object of the present invention is to provide one to reduce end thrust, reduce frictional loss, improve the electronic pump in associated components life-span.
For achieving the above object, the present invention adopts following technological scheme: a kind of electronic pump, comprises the first housing, point spacer, the second housing, rotor part and stator component; First, second housing described forms the inner chamber of described electronic pump, the inner chamber of described electronic pump is divided into wet chamber and dry chamber by described point of spacer, described rotor part is arranged at described wet chamber, described stator component is arranged at described dry chamber, described wet chamber is provided with import and outlet, described rotor part comprises impeller, and described impeller comprises blade and back shroud of impeller; Described back shroud of impeller and described blade are fixedly installed; During described electronic pump work, described wet chamber comprise can be communicated with low pressure area, zone of high pressure and higher pressure district, described low pressure area and described inlet communication, described zone of high pressure and described outlet, described higher pressure district comprises the described wet chamber of part below described back shroud of impeller; Described electronic pump also comprises an axially stop block, described axially stop block for limit described impeller due to pressure imbalance to described importer to axial motion be no more than intended distance; Described electronic pump also comprises axial force balance structure, and described axial force balance structure comprises the relief hole running through described back shroud of impeller and arrange; Described relief hole is communicated with described low pressure area and described higher pressure district; Described axial force balance structure also comprises the protruding ring of described back shroud of impeller setting and the annular groove of described separation cover setting, described protruding ring to be arranged on described back shroud of impeller and oppositely protruding towards described import, the described protruding ring of part inserts described annular groove inner chamber, keep at a certain distance away between the outer surface of described protruding ring and described annular groove inwall, form gap.
Described relief hole comprises at least two apertures, and described aperture distributes about the Central Symmetry of described back shroud of impeller, and the quantity of described aperture is less than or equal to the quantity of described blade.
Described aperture equidistantly distributes, and adjacent described small hole center is identical with the phase angle that the described back shroud of impeller line of centres is formed, and described in the centre distance of each described adjacent apertures, the distance at the center of back shroud of impeller is identical.
Described back shroud of impeller is provided with described impeller mounting hole, described aperture is arranged near described impeller mounting hole as far as possible, and each described aperture is arranged in the region that the starting point line of adjacent blades and adjacent blades starting point and the described back shroud of impeller line of centres and described impeller mounting hole outer rim form.
The diameter of described back shroud of impeller is D2, the diameter of described aperture is d, the diameter d of described aperture is more than or equal to 0.01 times of the diameter D2 of described back shroud of impeller and is less than or equal to 0.08 times of the diameter D2 of described back shroud of impeller, described small hole center is R apart from first distance at described back shroud of impeller center, and described first distance R is more than or equal to 0.05 times of the diameter D2 of described back shroud of impeller and is less than or equal to 0.25 times of the diameter D2 of described back shroud of impeller.
The free end of described protruding ring is arranged to sharp-edged, and described sharp-edged is by carrying out chamfering formation at described protruding ring, and the angle of described chamfering is less than or equal to 45 degree.
The height of projection of described protruding ring is more than or equal to 0.2 times that 0.02 times of described back shroud of impeller external profile diameter is less than or equal to described back shroud of impeller external profile diameter.
The distance at the center of back shroud of impeller described in described protruding ring inwall is greater than described relief hole centre distance apart from the distance at the center of described back shroud of impeller; The diameter D1 of the circumference that the outer wall of described protruding ring is formed is more than or equal to 0.8 times of the diameter D2 of the circumference that back shroud of impeller outward edge is formed, simultaneously described protruding ring the diameter D1 of circumference that formed of outer wall be less than or equal to the diameter D2 of the circumference that described back shroud of impeller outward edge is formed.
Described gap is for comprising radial clearance and axial clearance, wherein said radial clearance is the gap between described annular protrusion sidewall and described annular groove sidewall, described axial spacing is the gap bottom annular groove described in described annular protrusion distance from top, and described radial clearance is greater than 0.02 times that 0.004 times of described impeller rear end cover external profile diameter is less than or equal to described impeller rear end cover external profile diameter.
Described rotor assembly is arranged in described stator module inner diameter volume, described rotor and described impeller integrated injection molding, described rotor is provided with one second annular groove at the junction plane of described rotor and described back shroud of impeller, and the region on described back shroud of impeller top is communicated with by described relief hole with the region at described second annular groove place.
Compared with prior art, the present invention is by the axial force balance structure of the protruding ring and circular groove structure and relief hole that arrange cooperation, make to act on back shroud of impeller lower surface to importer to pressure reduce, and then to importer to end thrust reduce, reduce frictional loss, improve the working life of associated components.
[accompanying drawing explanation]
Fig. 1 is the axial cross-sectional schematic of first embodiment of the invention electronic pump;
Fig. 2 is the structural representation of rotor part shown in Fig. 1;
Fig. 3 is the structure of front shroud of impeller shown in Fig. 1 cross-sectional schematic;
Fig. 4 is the close-up schematic view in the portion of A shown in Fig. 1;
Fig. 5 is the axial cross-sectional schematic of second embodiment of the invention electronic pump;
Fig. 6 is the structural representation of rotor part shown in Fig. 5;
Fig. 7 is back shroud of impeller shown in Fig. 5 and blade structure schematic diagram;
Fig. 8 is the close-up schematic view in the portion of B shown in Fig. 5;
Fig. 9 is the pressure distribution trend schematic diagram acting on back shroud of impeller of electronic pump shown in Fig. 5;
Figure 10 is the axial cross-sectional schematic of third embodiment of the invention electronic pump;
Figure 11 is the structural representation of rotor part shown in Figure 10;
Figure 12 is the axial cross-sectional schematic of the present invention's the 4th kind of mode of execution electronic pump.
[embodiment]
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
As shown in Figures 1 to 12, electronic pump 100,200,300,400 comprises rotor part 1, frame 2, point spacer 3, stator component 8, circuit board 9; Frame 2 comprises the first housing 21 and the second housing 22, and rotor part 1 comprises pump shaft 12, impeller 11 and rotor 13; First housing 21 and the second housing 22 form the inner chamber of electronic pump 100, and electronic pump 100 inner chamber is divided into two independently cavitys by a point spacer 3, two independently cavity be respectively: the dry chamber 32 that wet chamber 31 and working medium for working medium circulation do not enter; Between first housing 21 and point spacer 3, sealing arranges to form wet chamber 31, second housing 22 and divide sealing between spacer 3 to arrange and forms dry chamber 32; Rotor part 1 is arranged at wet chamber 31, and stator component 8 and circuit board 9 are arranged at dry chamber 31, and such stator component 8 does not contact with working medium with circuit board 9, can prevent stator component 8 and circuit board 9 from being corroded by working medium, cause product failure; Stator component 8 and circuit board 9 and point spacer 3 and or the second housing 22 be fixedly installed, by being electrically connected between stator component 8 with circuit board 9, between stator component 8 and rotor part 9, produce magnetic force by the curent change controlling stator component 8, realize the rotary motion of rotor part 1; Wet chamber 31 is communicated with import 20 and outlet 30, and during electronic pump work, working medium enters wet chamber 31 by import 20, and boosting after the rotary motion of rotor part 1 also leaves wet chamber 31 by outlet 30; Such import 20 is communicated with low pressure area 311, and outlet 30 is communicated with zone of high pressure 312, and wet chamber 31 also comprises an elevated pressures district 313, and elevated pressures district 313 is below impeller 11 and between the bottom of cylinder of point spacer 2, pressure is less than or equal to the pressure of zone of high pressure 312.Electronic pump 100 also comprises an axially stop block, when electronic pump 100 works, for limit axial motion from impeller 11 to import 20 direction in prespecified range.Electronic pump 100 also comprises an axial force balance structure, when electronic pump 100 works, axial force balance structure can make impeller 11 make a concerted effort to reduce to the axial force in import 20 direction, thus the friction reduced axially stop block, reduce the loss of axially stop block, and then improve the working life of product.
As shown in Figure 1 to 11, rotor part 1 comprises impeller 11, pump shaft 12, rotor 13; Rotor 13 impeller 11 rotates around pump shaft 12; Wherein, pump shaft 12 can be fixedly installed relative to frame 2, also can relative to frame rotary motion, when pump shaft 12 rotates, impeller 11, pump shaft 12 and rotor 13 are fixedly connected with (as shown in figure 12), pump shaft 12 is rotatable to be supported on frame 2, and such as one end is supported on the first housing 21, and one end is supported on point spacer 3; When pump shaft 12 is fixedly installed relative to frame 2, rotor part 1 also comprises an axle sleeve 14, rotor 13 and impeller 11 are all fixedly connected with axle sleeve 14, pump shaft 12 comprises the first end 121 and the second end 122, first end 121 is arranged near import 20, first end 121 is supported setting by the first housing 21, and the second end 122 is arranged away from import 20, and the second end 122 is supported setting by a point spacer 3; Axle sleeve 14 is all fixedly installed with impeller 11 and rotor 13, and impeller 11 is arranged near the first end 121, and rotor 13 is arranged near the second end 122; In the present embodiment, second end 122 is fixedly installed with a point spacer 3, when electronic pump works, stator component 8 makes rotor 13 drive axle sleeve 14 and impeller 11 to rotate with the magnetic force effect of rotor assembly 1, axle sleeve 14 is sheathed on outside pump shaft 12, and between the outer surface of the internal surface of axle sleeve 14 and pump shaft 12, there is certain small fit up gap, make working medium can be filled between axle sleeve 14 and pump shaft 12, form lubricating layer.
Be the electronic pump 100 of the first mode of execution of the present invention as shown in Figure 1 to Figure 4, as shown in Figure 1, axially stop block comprises: clutch shaft bearing seat 41 and clutch shaft bearing 51, clutch shaft bearing seat 41 is fixedly connected with the first housing 21, clutch shaft bearing 51 is arranged in clutch shaft bearing seat 41, clutch shaft bearing 41 can be stupalith, not only can improve wear resistance and can also improve thermal conductivity and heatproof winter hardiness; When the working power of electronic pump 100 is less, axially stop block can be comprise being arranged at annular groove on pump shaft 12 and open washer near the first end 122, can reduce the cost of component like this, and then reduce the manufacture cost of electronic pump.
Impeller 11 comprises front shroud of impeller 111, blade 112 and back shroud of impeller 113, front shroud of impeller 111 is arranged near import 20, back shroud of impeller 113 is arranged away from import 20, front shroud of impeller 111 and blade 112 top edge are fixedly installed, back shroud of impeller 113 and blade 112 lower limb are fixedly installed, such as back shroud of impeller 113 and blade 112 can be integrated injection molded, impeller upper cover plate 111 and blade 112 are fixed by riveted joint.
Shown in Figure 3, front shroud of impeller 111 comprises the guide portion 111a and joint 111b that are wholely set, and it is inner that guide portion 111a is used for working medium being imported impeller 11, and joint 111b is fixedly connected with blade 12 top edge; Guide portion 111a comprises the first protruding ring from joint 112 to import 20 direction projection; First protruding ring and the pump shaft 12 of guide portion 111a are coaxially arranged; Front shroud of impeller 111 also comprises step 111c, and step 111c is arranged at the junction of guide portion 111a and joint 111b, and step 111c protrudes certain altitude to pump shaft 12 direction, and the end of guide portion 111 is sharp-edged, and the angle of sharp-edged is less than or equal to 45 degree.
Shown in Fig. 1 and Fig. 4, first housing 21 is provided with first ring connected in star 211, first ring connected in star 211 is corresponding with guide portion 111a to be arranged, first ring connected in star 211 and pump shaft 12 are coaxially arranged, first protruding ring of guide portion 111a inserts first ring connected in star 21 inside, and keep at a certain distance away between the outward edge of the first protruding ring and first ring connected in star 211 inwall, form the first gap, the first gap can be communicated with low pressure area 311 and zone of high pressure 312, in present embodiment, axial force balance structure is the first axial force balance structure, first axial force balance structure comprises the first ring connected in star 211 of guide portion 11a and the setting of the first housing 21, and guide portion 111a inserts first ring connected in star 211, and forms the first communication gap, first axial force balance structure of such setting, when electronic pump 100 works, the working medium between the upper surface and the first housing 21 internal surface of front shroud of impeller 111 is obstructed when can be made to flow to import 20 region, what the pressure acting on front shroud of impeller 111 upper surface was reduced is slower, act on increasing to some extent relative to not arranging comparing of the first axial force balance structure to the reciprocal pressure of import 20 of front shroud of impeller 111 upper surface like this, and the pressure to import 20 direction acting on back shroud of impeller 113 is constant, the active force like this impeller 11 being pushed to import 20 direction makes a concerted effort to reduce, the wearing and tearing to axially stop block can be reduced, improve the working life of electronic pump 100.
First gap comprises the first axial clearance 211a and the first radial clearance 211b, gap between first axial clearance 211a refers to bottom guide portion 111a top and first ring connected in star 211, the first radial clearance 211b refers to the gap between guide portion 111a and first ring connected in star 211 sidewall; First radial clearance 211b should ensure that guide portion 111a can insert first ring connected in star 211 smoothly when assembling, can't collide, simultaneously the first radial clearance 211b is greater than 0.02 times that 0.004 times of the maximum external profile diameter of wheel nose lid is less than or equal to the maximum external profile diameter of wheel nose lid outer rim, ensures that the first radial clearance 211b plays the effect of current limliting; When ensureing electronic pump work, the top of guide portion 111a can not contact with producing bottom first ring connected in star 211, and the first axial clearance 211a is little as far as possible.
In the present embodiment, the height of projection of step 111c is more than or equal to the distance in the first gap, working medium like this through the first gap is obstructed again at step 111c place, the pressure of the upper surface of front shroud of impeller 111 can be better stoped to reduce, the pressure of further reduction axially stop block, reduces the wearing and tearing of axially stop block; In the present embodiment, the first gap can ensure that guide portion 111 inserts first ring connected in star 211 smoothly, and when electronic pump works, the inside of guide portion 111a and first ring connected in star 211 does not collide; First housing 21 comprises the first annular sidewall 212 and the second annular sidewall 213, first annular side 212 wall is arranged near pump shaft 12, second annular sidewall 213 is arranged away from pump shaft 12, first annular sidewall 212 and the second annular sidewall 213 form first ring connected in star 211, first annular sidewall 212 is cantilever structure, the free end of the first annular sidewall 212 and the upper surface of step 111c keep at a certain distance away, and form the second gap; The shape of the bottom of first ring connected in star 211 matches with the structure of guide portion 111a end sharp-edged, carries out chamfering setting simultaneously, can prevent that stress is concentrated like this to the bottom of first ring connected in star 211, ensures the intensity of impeller cavity upper shell 2; When the guide portion 111a being provided with sharp-edged coordinates with the first annular groove section 211, the flow resistance of working medium can obviously increase, compared with being the structure of the straight angle with guide portion 111a end, when equivalent effect, the distance in the first gap can be more greatly, so not only facilitate the assembling of guide portion 111a and the first annular groove section 211, can prevent front shroud of impeller 111 from producing with the first housing 21 in the running simultaneously and interfere.
The electronic pump 200 of second embodiment of the invention is see shown in Fig. 5 to Fig. 9, compared with the first mode of execution, the main distinction is: in the present embodiment, axial force balance structure is the second axial force balance structure, and the second axial force balance structure is arranged on back shroud of impeller 113 or is arranged on back shroud of impeller 113 and the second housing 22; Second axial force balance structure comprises the relief hole 131 running through back shroud of impeller 113, relief hole 131 is for being communicated with area of low pressure 311 and higher pressure region 313, reduced by the pressure in relief hole 131 higher pressure region 313, the end thrust to import 20 direction acted on like this on back shroud of impeller 113 reduces, the friction of axle sleeve 5 pairs of axially stop blocks can be weakened, extend the working life of product; Relief hole 131 as far as possible near the central position of back shroud of impeller 113, and along the peripheral distribution in the pump shaft hole that back shroud of impeller 113 is arranged; Aperture 113 is arranged in the region that the starting point 112a line of adjacent blades and adjacent blades starting point 112a and back shroud of impeller 13 line of centres and impeller mounting hole outer rim form; Concrete, the starting point 112a tangent (as shown in Figure 7) of the circumference that multiple aperture 113 is formed and the described blade near described pump shaft, the relief hole 131 of such distribution can make zone of high pressure, rotor 13 place be communicated with the low pressure area at import 20 place to greatest extent, can reduce the pressure of zone of high pressure fast; The flow tendency impact of pressure leak process on import step medium is simultaneously less.
Shown in Figure 7, relief hole 131 comprises the multiple aperture 131a running through back shroud of impeller 113 be circumferentially arranged along described back shroud of impeller 13, and aperture 131a is at least two, and is symmetrical arranged, and makes back shroud of impeller 113 stress balance; In the present embodiment, the quantity of aperture 131a is less than or equal to the quantity of blade 112, and aperture 131a is along the equidistantly distribution of back shroud of impeller 113 circumference, and each aperture 131a center is identical to the distance at back shroud of impeller 113 center, the centre distance of adjacent apertures 131a is identical, and manufacturing tolerances is less than 5%; In the present embodiment, rotor 13 is arranged in stator component 8 inner chamber, in order to make relief hole 131 closer to the center of back shroud of impeller 13, be formed with the second annular groove 71 (as Figure 1 and Figure 4) along rotor 13 circumference between cover plate 113 and rotor 13 after the impeller, the area of low pressure of import 20 is communicated with the high-pressure area at rotor 13 place by the aperture 131a running through back shroud of impeller 113; Certainly when stator component 8 is arranged at rotor 13 inner chamber, without the need to carrying out the effect that machined grooves 71 can reach same.
The diameter of back shroud of impeller 13 outer rim is D2, the diameter of aperture 131a is d, the diameter d of aperture 131a is more than or equal to 0.01 times of the diameter D2 of back shroud of impeller 13 outer marginal circumference and is less than or equal to 0.04 times of the diameter D2 of described back shroud of impeller, first distance at aperture 131a centre distance back shroud of impeller 13 center is R, and the first distance R is more than or equal to 0.05 times of the diameter D2 of back shroud of impeller 13 outer rim and is less than or equal to 0.5 times of the diameter D2 of back shroud of impeller outer rim; The relief hole 131 of such setting can ensure that the pressure in higher pressure district 313 discharges to low pressure area, can reduce the injection of current simultaneously, reduce the impact in neighbouring flow field.
In the present embodiment, the second axial force balance structure not only comprises relief hole 131, can also comprise the second protruding ring 132, second protruding ring 132 and be arranged on back shroud of impeller 113, and near outlet 30 and towards import 20 projection in the other direction; The free end of the second protruding ring 132 is sharp-edged structure, and the angle of described sharp-edged is less than or equal to 45 degree.
The height of projection h of protruding ring 132 is more than or equal to 0.2 times that 0.02 times of back shroud of impeller 13 external profile diameter D2 is less than or equal to back shroud of impeller 13 external profile diameter D2; For normally used electronic pump, height of projection h is more than or equal to 1 millimeter.
Second housing 22 is provided with the 3rd annular groove the 31, three annular groove 31 corresponding to the second protruding ring 132 and coaxially arranges with pump shaft 12, second protruding ring 132 can insert in the 3rd annular groove 31, and keeps at a certain distance away between described second protruding ring 132 and described 3rd annular groove 31, forms the second gap, makes working medium can by the second Clearance Flow, the second protruding ring 132 arranged by correspondence and the 3rd annular groove 31 play throttling action, the pressure of back shroud of impeller 113 can be made sharply to decline, shown in Figure 9, compared with the situation of relief hole 131 (as shown by curve 1) is set separately, the end thrust less (the cartographic represenation of area end thrust below curve) that relief hole 131 and the second protruding ring 132 and the 3rd annular groove 31 structure (as shown by curve 2) act on back shroud of impeller 113 is set simultaneously, because at the second protruding ring 132 and the 3rd annular groove 31 junction point, pressure there will be and sharply declines, area under such pressure curve obviously reduces, corresponding end thrust reduces.
Second gap comprises the second axial clearance 31a and the second radial clearance 31b, second radial clearance 31b is the gap between the second protruding ring 132 sidewall and the 3rd annular groove 31 sidewall, second axial spacing 31b is the gap bottom the second protruding ring 132 distance from top the 3rd annular groove 31, and the second radial clearance 31b is greater than 0.02 times that 0.004 times of impeller rear end cover 113 external profile diameter D2 is less than or equal to impeller rear end cover 113 external profile diameter; When second axial clearance 31b ensures electronic pump work, the bottom of the second protruding ring 132 top and the 3rd annular groove 31 does not collide, and gap is as far as possible little.
As shown in Figure 6, the distance at the second protruding ring 132 inwall distance back shroud of impeller 113 center is greater than the distance at relief hole 131 centre distance back shroud of impeller 132 center, and such relief hole 131 is positioned at the space that the second protruding ring surrounds, and pressure release effectiveness comparison is obvious; The diameter of a circle that the outer wall of the second protruding ring 132 is formed is more than or equal to 0.8 times of the diameter of a circle that back shroud of impeller 113 outward edge is formed, simultaneously the second protruding ring 132 the diameter of a circle that formed of outer wall be less than or equal to the diameter of a circle that back shroud of impeller 113 outward edge formed.
Third embodiment of the invention electronic pump 300 as shown in Figure 9 and Figure 10, electronic pump 300, axial force balance structure comprises the first protruding ring 111a and first ring connected in star 21 and the first gap, the second protruding ring 132 and the second annular groove 31 and the second gap, and relief hole 131; Like this, the pressure acting on front shroud of impeller upper surface increases, and the pressure acting on back shroud of impeller lower surface reduces, make to importer to end thrust make a concerted effort reduce, reduce the wearing and tearing of axially stop block, improve life of product; In the present embodiment, front shroud of impeller is identical with back shroud of impeller outside diameter, and the first gap can be identical with the spacing in the second gap, facilitates manufacturing like this.
The present invention's the 4th kind of mode of execution electronic pump 400 as shown in figure 12, compared with the 3rd mode of execution, the main distinction is: rotor part 1 does not comprise bearing 14, rotor 7 is fixedly connected with pump shaft 12 with impeller 11, pump shaft 12 rotates with rotor, and impeller 11 rotates, pump shaft 12 two ends by bearings on the first housing 21 and point spacer 3.
It should be noted that: above embodiment is only for illustration of the present invention and unrestricted technological scheme described in the invention, although this specification reference the above embodiments are to present invention has been detailed description, but, those of ordinary skill in the art is to be understood that, person of ordinary skill in the field still can modify to the present invention or equivalent replacement, and all do not depart from technological scheme and the improvement thereof of the spirit and scope of the present invention, all should be encompassed in right of the present invention.
Claims (10)
1. an electronic pump, comprises the first housing, point spacer, the second housing, rotor part and stator component; First, second housing described forms the inner chamber of described electronic pump, the inner chamber of described electronic pump is divided into wet chamber and dry chamber by described point of spacer, described rotor part is arranged at described wet chamber, described stator component is arranged at described dry chamber, described wet chamber is provided with import and outlet, described rotor part comprises impeller, and described impeller comprises blade and back shroud of impeller; Described back shroud of impeller and described blade are fixedly installed; It is characterized in that: during described electronic pump work, described wet chamber comprise can be communicated with low pressure area, zone of high pressure and higher pressure district, described low pressure area and described inlet communication, described zone of high pressure and described outlet, described higher pressure district comprises the described wet chamber of part below described back shroud of impeller; Described electronic pump also comprises an axially stop block, described axially stop block for limit described impeller due to pressure imbalance to described importer to axial motion be no more than intended distance; Described electronic pump also comprises axial force balance structure, and described axial force balance structure comprises the relief hole running through described back shroud of impeller and arrange; Described relief hole is communicated with described low pressure area and described higher pressure district; Described axial force balance structure also comprises the protruding ring of described back shroud of impeller setting and the annular groove of described separation cover setting, described protruding ring to be arranged on described back shroud of impeller and oppositely protruding towards described import, described protruding ring inserts described annular groove inner chamber, keep at a certain distance away between the outer surface of described protruding ring and described annular groove inwall, form gap.
2. electronic pump according to claim 1, is characterized in that: described relief hole comprises at least two apertures, and described aperture distributes about the Central Symmetry of described back shroud of impeller, and the quantity of described aperture is less than or equal to the quantity of described blade.
3. electronic pump according to claim 2, it is characterized in that: described aperture equidistantly distributes, adjacent described small hole center is identical with the phase angle that the described back shroud of impeller line of centres is formed, and described in the centre distance of each described adjacent apertures, the distance at the center of back shroud of impeller is identical.
4. electronic pump according to claim 3, it is characterized in that: described back shroud of impeller is provided with described impeller mounting hole, described aperture is arranged near described impeller mounting hole as far as possible, and each described aperture is arranged in the region that the starting point line of adjacent blades and adjacent blades starting point and the described back shroud of impeller line of centres and described impeller mounting hole outer rim form.
5. electronic pump according to claim 2, it is characterized in that: the diameter of described back shroud of impeller is D2, the diameter of described aperture is d, the diameter d of described aperture is more than or equal to 0.01 times of the diameter D2 of described back shroud of impeller and is less than or equal to 0.08 times of the diameter D2 of described back shroud of impeller, described small hole center is R apart from first distance at described back shroud of impeller center, and described first distance R is more than or equal to 0.05 times of the diameter D2 of described back shroud of impeller outer rim and is less than or equal to 0.25 times of the diameter D2 of described back shroud of impeller.
6. electronic pump according to claim 1, is characterized in that: the free end of described protruding ring is arranged to sharp-edged, and described sharp-edged is by carrying out chamfering formation at described protruding ring, and the angle of described chamfering is less than or equal to 45 degree.
7. electronic pump according to claim 1, is characterized in that: the height of projection of described protruding ring is more than or equal to 0.02 times of described back shroud of impeller external profile diameter D2, is less than or equal to 0.2 times of described back shroud of impeller external profile diameter D2.
8. electronic pump according to claim 1, is characterized in that: the distance at the center of back shroud of impeller described in described protruding ring inwall is greater than described relief hole centre distance apart from the distance at the center of described back shroud of impeller; The diameter D1 of the circumference that the outer wall of described protruding ring is formed is more than or equal to 0.8 times of the diameter D2 of the circumference that back shroud of impeller outward edge is formed, simultaneously described protruding ring the diameter D1 of circumference that formed of outer wall be less than or equal to the diameter D2 of the circumference that described back shroud of impeller outward edge is formed.
9. electronic pump according to claim 5, it is characterized in that: described gap is for comprising radial clearance and axial clearance, wherein said radial spacing is the distance between described annular protrusion sidewall and described annular groove sidewall, described axial spacing is the distance bottom annular groove described in described annular protrusion distance from top, and described radial clearance is greater than 0.02 times that 0.004 times of described impeller rear end cover external profile diameter is less than or equal to described impeller rear end cover external profile diameter.
10. the electronic pump according to any one of claim 1-8, it is characterized in that: described rotor assembly is arranged in described stator module inner diameter volume, described rotor and described impeller integrated injection molding, described rotor is provided with one second annular groove at the junction plane of described rotor and described back shroud of impeller, and the region on described back shroud of impeller top is communicated with by described relief hole with the region at described second annular groove place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410495854.1A CN105443397B (en) | 2014-09-24 | 2014-09-24 | Electronic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410495854.1A CN105443397B (en) | 2014-09-24 | 2014-09-24 | Electronic pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105443397A true CN105443397A (en) | 2016-03-30 |
| CN105443397B CN105443397B (en) | 2019-02-12 |
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| CN201410495854.1A Active CN105443397B (en) | 2014-09-24 | 2014-09-24 | Electronic pump |
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| CN105784233A (en) * | 2016-03-31 | 2016-07-20 | 上海交通大学 | Test device and test method for interactive influence of axial pressure flow and circumferential shear flow on clearance flow resistance of each other |
| CN109162958A (en) * | 2018-10-31 | 2019-01-08 | 芜湖飞龙汽车电子技术研究院有限公司 | A kind of electronic water pump for automobile flow blocking mechanism |
| CN113958497A (en) * | 2020-07-21 | 2022-01-21 | 博利源科技(南京)有限公司 | Front cover structure of shaftless magnetic drive pump |
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| CN113958497A (en) * | 2020-07-21 | 2022-01-21 | 博利源科技(南京)有限公司 | Front cover structure of shaftless magnetic drive pump |
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| CN105443397B (en) | 2019-02-12 |
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