CN207701454U - Centrifugal pump - Google Patents

Abstract

A kind of centrifugal pump,Including impeller,Impeller includes multiple blades and lower cover,Blade is fixedly installed with lower cover,Multiple blades include linear leaf and short blade,Impeller further includes multiple through-holes,Through-hole forms in lower cover,Through-hole is set between adjacent linear leaf,Linear leaf includes the first convex side wall and the first concave side wall,It is respectively the first linear leaf and the second linear leaf to define two linear leafs adjacent with through-hole,It is directed to through-hole and first linear leaf and second linear leaf adjacent with the through-hole,The first concave side wall relative to the second linear leaf,Through-hole is closer to the first convex side wall of the first linear leaf,Or the shortest distance of the center of through-hole to the first convex side wall of the first linear leaf is less than the shortest distance to the first concave side wall of the second linear leaf,The through-hole being arranged in this way advantageously reduces the axial force of impeller,Improve the service life of centrifugal pump.

Description

Centrifugal pump

【Technical field】

The utility model is related to a kind of fluid pumps, and in particular to a kind of centrifugal pump.

【Background technology】

In recent decades, centrifugal pump is largely applied in heat circulating system, and is well positioned to meet the requirement in market.

Centrifugal pump includes rotor assembly, and rotor assembly includes impeller, and when centrifuging pump operation, high-speed rotating impeller is to work Medium does work, this to cause rotor assembly that axial float occurs since fluid force suffered by both sides above and below impeller is different Axial float will influence the service life of centrifugal pump.

Therefore, it is necessary to be improved to the above problem, to solve the above technical problem.

【Utility model content】

The purpose of this utility model is to provide a kind of centrifugal pump, the axial force for being conducive to reduce impeller is to reduce rotor The axial float of component, the reduction of this axial float are conducive to improve the service life of pump.

To achieve the above object, the utility model adopts the following technical solution：A kind of centrifugal pump, including rotor assembly, pump Axis, the rotor assembly can be surrounded or be rotated together with the pump shaft, and the rotor assembly includes impeller, the impeller packet Multiple blades and lower cover are included, the multiple blade includes linear leaf and short blade, and the length of the linear leaf is more than described short The length of blade, the linear leaf are distributed or are uniformly distributed along the lower cover circumference array, and the short blade is set to adjacent Between linear leaf, the impeller further includes through-hole, and the through-hole forms in the lower cover, and the through-hole runs through the lower cover Upper and lower surface, the through-hole are set between the adjacent linear leaf, and the linear leaf includes that the first convex side wall and first are recessed Side wall；The through-hole and adjacent with the through-hole two linear leafs are directed to, linear leaf described in above-mentioned two is defined Respectively the first linear leaf and the second linear leaf, first of the first convex side wall than first linear leaf of first linear leaf Concave side wall is arranged closer to the through-hole, first of the first concave side wall than second linear leaf of second linear leaf Convex side wall is arranged closer to the through-hole, and relative to the first concave side wall of second linear leaf, the through-hole is closer to described First convex side wall of the first linear leaf.

A kind of centrifugal pump, including rotor assembly, pump shaft, the rotor assembly can surround or turn with the pump shaft Dynamic, the rotor assembly includes impeller, and the impeller includes multiple blades and lower cover, the multiple blade include linear leaf and Short blade, the length of the linear leaf are more than the length of the short blade, and the linear leaf is along the lower cover circumference array point Cloth is uniformly distributed, and the short blade is set between adjacent linear leaf, and the impeller further includes through-hole, and the through-hole forms in The lower cover, the through-hole run through the lower cover upper and lower surface, and the through-hole is set between the adjacent linear leaf, The linear leaf includes the first convex side wall and the first concave side wall；It is directed to the through-hole and adjacent with the through-hole two institutes State linear leaf, it is respectively the first linear leaf and the second linear leaf to define linear leaf described in above-mentioned two, first linear leaf First convex side wall is arranged than the first concave side wall of first linear leaf closer to the through-hole, second linear leaf it is described First concave side wall is arranged than the first convex side wall of second linear leaf closer to the through-hole, just to horizontal plane by the impeller The shortest distance of projection, the projection of described first convex side wall of the center that the through-hole projects to first linear leaf is less than institute State the shortest distance of the projection of the center of through-hole to the first concave side wall of second linear leaf.

In the utility model, centrifugal pump includes impeller, and impeller includes blade and lower cover, and lower cover is formed with through-hole, is led to The axial force that hole is conducive to reduce impeller improves the service life of centrifugal pump to reduce the axial float of rotor assembly；For In through-hole and adjacent with through-hole two linear leafs, it is respectively that the first linear leaf and second come into leaves to define above-mentioned two linear leaf First convex side wall of piece, the first linear leaf is arranged than the first concave side wall of the first linear leaf closer to through-hole, the second linear leaf First concave side wall is arranged than the first convex side wall of the second linear leaf closer to through-hole, the first concave side relative to the second linear leaf Wall, through-hole are closer to the first convex side wall of the first linear leaf；Or by impeller to horizontal plane orthographic projection, the center of through-hole projection is arrived The shortest distance of the projection of first convex side wall of the first linear leaf is less than the center of through-hole to the first concave side wall of the second linear leaf Projection the shortest distance；Be conducive in this way reduce impeller axial force, to reduce the axial float of rotor assembly, improve from The service life of heart pump.

【Description of the drawings】

Fig. 1 is a kind of a kind of cross section structure schematic diagram of embodiment of centrifugal pump；

Fig. 2 is a kind of a kind of cross section structure schematic diagram of embodiment of rotor assembly in Fig. 1；

Fig. 3 is an a kind of decomposition texture schematic diagram of embodiment of rotor assembly in Fig. 1；

Fig. 4 is a cross section structure schematic diagram of first part in Fig. 3 rotor assembly；

Fig. 5 is an overlooking structure diagram of first part in Fig. 3 rotor assembly；

Fig. 6 is an overlooking structure diagram of second part in Fig. 3 rotor assembly；

Fig. 7 is a close-up schematic view of second part in Fig. 6 rotor assembly；

Fig. 8 is a kind of structural schematic diagram of the another embodiment of rotor assembly in Fig. 1；

Fig. 9 is a cross section structure schematic diagram of Fig. 7 rotor assembly；

Figure 10 is an overlooking structure diagram of Fig. 7 rotor assembly.

【Specific implementation mode】

The utility model is described in further detail in the following with reference to the drawings and specific embodiments：

In general, centrifugal pump 100 generally comprises mechanical centrifugal pump and electrodynamic type centrifugal pump, mechanical centrifugal pump passes through machinery Impeller rotation is moved, electric drive centrifugal pump includes having magnetic rotor, and rotor banding moves wheel rotation；The utility model Centrifugal pump is mainly used for automotive field, and the working media of predominantly automotive thermal tube reason system provides mobilization dynamic；Below to electronic Formula centrifugal pump illustrates, and certainly, the specific implementation mode of electrodynamic type centrifugal pump can equally be well applied to mechanical centrifugal pump.

Referring to Fig. 1, centrifugal pump 100 includes rotor assembly 4, stator module 1, pump shaft 3, electronic control unit 2, pump cover 5, separation sleeve 8 and electric machine casing 9, rotor assembly 4 includes permanent magnet 40, and stator module 1 includes coil 10, and pump cover 5 includes 50 He of inlet tube Outlet 51, pump cover 5, separation sleeve 8 and electric machine casing 9 are relatively fixed setting and form pump case, and pump case can form pump inner cavity, Separation sleeve 8 will pump inner cavity and be divided into dry chamber 90 and wet chamber 91, is flowed through without working media in dry chamber 90, can there is work in wet chamber 91 Medium flows through, and stator module 1 is set in dry chamber 90, and rotor assembly 4 is set in wet chamber 91.It is automatically controlled when centrifugal pump 100 works The control of unit 2 controls the excitation field that stator module 1 generates, rotor set by the electric current of the coil 10 in stator module 1 The permanent magnet 40 of part 4 can surround pump shaft 3 under the action of excitation field and rotate.When working media passes through the inlet tube of pump cover 5 50 enter pump inner cavity, and rotor assembly 4 does work to the working media for pumping inner cavity, and working media is thrown to pump cover 5 by centrifugation force effect Outlet 51 runner.

In conjunction with referring to Fig. 2 to Fig. 3, rotor assembly 4 includes impeller 6 and rotor 7, and impeller 6 includes upper cover plate 60,61 and of blade Lower cover 62, blade 61 forms between upper cover plate 60 and lower cover 62, in the present embodiment, 60 one of blade 61 and upper cover plate at Shape, it is integrally formed with upper cover plate 60 after blade 61 be fixedly connected again with lower cover 62, certainly, blade 61 can also be with lower cover After 62 is integrally formed, then it is fixedly connected with upper cover plate 60.Rotor assembly 4 includes two parts：First part 41 and second part 42, First part 41 includes permanent magnet 40 and lower cover 62, and first part 41 is injection molding inserts and 62 one of lower cover with permanent magnet 40 Injection molding is formed, and second part 42 includes upper cover plate 60 and blade 61, and upper cover plate 60 and 61 integrated injection molding of blade are formed.The present embodiment In, first part 41 and second part 42 are integrated by being welded and fixed, and certain first part 41 and second part 42 can also By other fixed forms, such as：It is interference fitted connection type or in such a way that attachment device is fixedly connected etc..

In conjunction with referring to Fig. 4 and Fig. 5, first part 41 includes lower cover 62 and permanent magnet 40, and lower cover 62 is formed with through-hole 411 and mounting groove 412, correspond to mounting groove 412, lower cover 62 includes the convex side wall 4121 of third and third concave side wall 4122, under Cover board 62 includes at least 2 through-holes, and in the present embodiment, through-hole is generally circular, here " substantially " refer to circularity 0.5mm with Interior, certain through-hole may be other shapes；In the present embodiment, through-hole 411 is set between adjacent fitting grooves 412, certainly logical Hole 411 can also be circumferentially uniformly arranged along lower cover；2 mounting grooves 412 are at least set on lower cover 62, and mounting groove 412 is in circle All array distributions are uniformly distributed, and in the present embodiment, lower cover 62 is provided with 5 mounting grooves 412, the quantity of mounting groove 412 with The quantity correspondent equal of linear leaf.

Referring to Fig. 6, second part 42 includes upper cover plate 60 and blade 61, and blade 61 includes multiple linear leafs 611 and multiple Short blade 610, and the length of linear leaf 611 is more than the length of short blade 610, the here " length of linear leaf 611 and short blade 610 Degree " refers to being surveyed 61 orthographic projection of blade along the shape track of the projection of linear leaf 611 and short blade 610 on horizontal plane The path length measured；In the present embodiment, blade 61 includes 5 linear leafs 611 and 5 short blades 610, certainly, blade 61 Quantity can also be more than 5 or be less than 5, and linear leaf 611 circumferentially array distribution or is uniformly distributed, short leaf along upper cover plate 60 Piece 610 is set between adjacent linear leaf 611, and linear leaf 611 includes the first head and the first tail portion, and the first head is than the first tail Portion includes the second head and the second tail portion close to impeller center, short blade 610, and the second head is than the second tail portion in impeller First tail portion of the heart, linear leaf 611 is concordant with the peripheral surface of upper cover plate 60, and linear leaf 611 includes the first convex side wall 6110 and the One concave side wall 6111, the first convex side wall 6110 are first pressure face when centrifugal pump 100 works, and the second concave side wall is in centrifugal pump It is the first back pressure face when 100 work, the operating pressure in first pressure face is more than the operating pressure in the first back pressure face, short blade 610 Including the second convex side wall 6102 and the second concave side wall 6101, the second convex side wall 6102 is second pressure face, the second concave side wall 6101 For the second back pressure face, the operating pressure in second pressure face is more than the operating pressure in the second back pressure face.

In conjunction with referring to Fig. 5 to Fig. 6, the convex side wall 4121 of third and the linear leaf 611 of second part 42 of first part 41 First concave side wall of the linear leaf 611 of the first convex side wall 6110, the third concave side wall 4122 of first part 41 and second part 42 6111 are correspondingly arranged, the second convex side of the third convex side wall 4121 and the short blade 610 of second part 42 of certain first part 41 Wall 6102, the third concave side wall 4122 of first part 41 and the second concave side wall 6101 of the short blade 610 of second part 42 also may be used Reach identical purpose to be correspondingly arranged.First part 41 and second part 42 are fixedly connected by welding to be formed after corresponding to combination Rotor assembly 4, certain first part 41 and second part 42 can also by other fixed forms, such as：Interference fit connection Mode is connected and fixed mode etc. by attachment device.

Referring to Fig. 6 and Fig. 7, in order to preferably describe the position relationship of through-hole 411, " the first linear leaf and the are introduced here Two linear leafs ", two concepts, by second part 42 and through-hole 411 to horizontal plane orthographic projection, be directed to through-hole projection 411 ' with And 411 ' two adjacent linear leafs 611 are projected with through-hole, it is respectively 71 He of the first linear leaf to define above-mentioned two linear leaf 611 Second linear leaf 72, the first concave side wall 6111 of 6110 to the first linear leaf 71 of the first convex side wall of the first linear leaf 71 closer to 411 ' setting of through-hole projection, the first convex side wall 6110 of 6111 to the second linear leaf 72 of the first concave side wall of the second linear leaf 72 is more Close to through-hole 26 be arranged, through-hole projection 411 ' center to above-mentioned first linear leaf 71 the first convex side wall 6110 projection most Short distance be less than through-hole projection 411 ' center to above-mentioned second linear leaf 72 the first concave side wall 6111 projection most short distance From, or relative to the first concave side wall 6111 of above-mentioned second linear leaf 72, through-hole projects 411 ' closer to the first linear leaf 71 First convex side wall 6110；The through-hole being arranged in this way not only improves the axial force for reducing impeller, to reduce the axial direction of rotor assembly Play, and the influence that through-hole structure flows centrifugal pump interior media is advantageously reduced, to reduce waterpower of the through-hole to pump The influence of energy；In addition what needs to be explained here is that：The position relationship of above-mentioned through-hole projection is the position relationship of through-hole.

The outer edge for defining upper cover plate 60 or lower cover 62 is the first circumference, a diameter of first diameter φ 1 of the first circumference, Define one second circumference, the tangent setting in the second head of the second circumference and short blade 610, a diameter of second diameter of the second circumference The ratio of φ 2, second diameter and first diameter is equal to 0.5 to 0.8, defines a third circumference, the centre bit of through-hole projection 411 ' In third circumference, a diameter of third diameter phi 3 of third circumference defines one the 4th circumference, and the of the 4th circumference and linear leaf 611 The tangent setting in one head, a diameter of 4th diameter phi 4 of the 4th circumference, third diameter phi 3 are more than the 4th diameter phi 4, and third is straight Diameter φ 3 is less than second diameter φ 2, and the axial force that through-hole is conducive to reduce impeller is arranged in this way.In the present embodiment, third diameter phi 3 are more than 1.3 times of the 4th diameter phi 4, and third diameter phi 3 is less than second diameter φ 2, and third diameter phi 3 is straight just at the 4th Between diameter φ 4 and second diameter φ 2, the through-hole being arranged in this way not only improves reduction noise, and is conducive to reduce the axial direction of impeller Power.

In conjunction with Fig. 1, when working media flows into pump inner cavity by the inlet tube 50 of pump cover 5, rotor assembly 4 surrounds pump shaft 3 Rotation does work to the working media between impeller 6, and for working media by centrifugation force effect, leaf is thrown at the center by impeller 6 The periphery of wheel 6 can be sent to pump to form low-pressure area at the center of impeller 6 by a part of fluid for throwing to 6 periphery of impeller The runner of the outlet 51 of lid 5, a part can be seeped into the rear side cavity of 62 lower surface of lower cover so that 62 lower surface of lower cover Rear side cavity forms the higher-pressure region higher than pressure at impeller center, and which results in the active forces suffered by both sides above and below impeller not Together, since impeller 6 offers through-hole 411, it has been connected to higher-pressure region and the low-pressure area of rotor assembly by through-hole 411, has made lower cover Fluid in the rear side cavity of 62 lower surfaces flows into low-pressure area by through-hole 411, can thus reduce 62 lower surface of lower cover Suffered active force improves the service life of centrifugal pump 100 to advantageously reduce the axial force of impeller 6.

In conjunction with Fig. 2, impeller 6 includes at least 2 through-holes 411, is conducive to the balance of impeller, total stream of through-hole 411 in this way Logical area is equal to the sum of the circulation area of each through-hole.While in order to ensure to reduce the axial force of impeller 6 as wide as possible, subtract Influence of the small through hole to 100 hydraulic performance of centrifugal pump, it is the first area to define the area that the first circumference is formed, and the first area is more than Equal to 755mm²Less than or equal to 2018mm², total circulation area of through-hole 411 and the ratio of the first area are more than or equal to 0.003, lead to Total circulation area in hole 411 is with the ratio of the first area less than or equal to 0.03, and in the present embodiment, total circulation area of through-hole is more than Equal to 3mm²Less than or equal to 40mm²；In the present embodiment, impeller includes 5 through-holes, and the circulation area of single through-hole is more than or equal to 0.8mm²Less than or equal to 8mm², the through-hole being arranged so both can guarantee the upper and lower surface of lower cover 62 in rotor assembly 4 Connection, and can guarantee that the influence that the circulation of working media between the blades is subject to is smaller.In addition, in the present embodiment, through-hole 411 Quantity is identical as the quantity of linear leaf 611, and certainly, the quantity of through-hole 411 can also be with the quantity difference of linear leaf 611 to reach To identical purpose.

Referring back to Fig. 6 and Fig. 7, it is directed to through-hole 411 and first linear leaf 71 and second adjacent with through-hole 411 comes into leaves Piece 72, the intersection point for defining the projection of the first convex side wall 6110 of third circumference and the first linear leaf 71 are the first intersection point A, third circle The intersection point of week and the projection of the first concave side wall 6111 of the second linear leaf 72 is the second intersection points B, the first intersection point A and the second intersection points B Between circular arc be the first circular arc, the first circular arc is overlapped with third circumference, between the midpoint C of the first circular arc and the first intersection point A Circular arc is the second circular arc, and the second circular arc is overlapped with third circumference, and the center of through-hole projection 411 ' is located in the second circular arc；It sets in this way While being equipped with conducive to balancing axial thrust, influence of the through-hole to centrifugal pump hydraulic performance is reduced.

The outer edge of through-hole 411 and the minimum range of the first convex side wall 6110 of the linear leaf 611 closer to through-hole 411 are big In equal to 0.8mm, " minimum range " here refers to the outer edge of through-hole projection 411 ' and the length closer to through-hole projection 411 ' The minimum range of first convex side wall 6110 of blade 611 is more than or equal to 0.8mm；The outer edge of through-hole 411 with closer to through-hole 411 The minimum range on the second head of short blade 610 be more than or equal to 0.8mm, " minimum range " here is through-hole projection 411 ' Outer edge and the minimum range on the second head of the short blade 610 closer to through-hole projection 411 ' are more than or equal to 0.8mm；This implementation In example, the first convex side wall 6110 of linear leaf 611 is substantially substantially flat with the convex side wall 4121 of the third of lower cover 62 shown in fig. 5 Together, therefore the minimum range of the convex side wall of the outer edge of blade through-hole 411 and third closer to through-hole 411 4121 is more than or equal to 0.8mm；The through-hole being arranged in this way can reduce axial force of impeller and reduce logical while ensureing not destroy blade construction Influence of the hole to centrifugal pump hydraulic performance.

It is the structural schematic diagram of the another embodiment of rotor assembly referring to Fig. 8 to Figure 10, Fig. 8 to Figure 10.

In conjunction with the structural schematic diagram that Fig. 8 to Fig. 9, Fig. 8 are the rotor assembly for not including upper cover plate, rotor assembly 4 ' includes turning Son 7 ' and impeller 6 ', it is that injection molding inserts forms one by injection molding that rotor 7 ', which is with permanent magnet 40 ', and impeller 6 ' includes blade 61 ' With lower cover 62 ', blade 61 ' and lower cover 62 ' be integrally formed or fixed setting, and impeller 6 ' further includes at least two through-hole 411 ", Through-hole 411 " is used to reduce the suffered axial force at work of impeller 6 ', and through-hole 411 " forms in lower cover 62 ' and under running through 62 ' upper and lower surface of cover board.In conjunction with referring to Fig. 9, blade 61 ' includes linear leaf 611 ' and short blade 610 ', the length of linear leaf 611 ' Degree is more than the length of short blade 610 ', and linear leaf 611 ' and short blade 610 ' are along the circumferentially array distribution or uniformly of lower cover 62 ' It being distributed, short blade 610 ' is provided between adjacent linear leaf 611 ', through-hole 411 " is set between adjacent linear leaf 611 ', this The position relationship of the design and the through-hole 411 of the first embodiment of the position relationship of through-hole 411 " and circulation area in embodiment And the design of circulation area is consistent, does not just repeat one by one herein.Compared with the first embodiment, do not wrapped in the present embodiment This setup for including upper cover plate is ensureing that axial force of impeller can be reduced, is reducing through-hole to the same of pump hydraulic performance influence When, manufacturing cost can be effectively reduced.

It should be noted that：Above example is merely to illustrate the utility model and not limits described by the utility model Technical solution, although this specification has been carried out detailed description with reference to the above embodiments to the utility model, this Field it is to be appreciated by one skilled in the art that person of ordinary skill in the field still can modify to the utility model Or equivalent replacement, and the technical solution of all spirit and scope for not departing from the utility model and its improvement, it should all cover In the right of the utility model.

Claims (20)

1. a kind of centrifugal pump, including rotor assembly, pump shaft, the rotor assembly can surround or turn with the pump shaft Dynamic, the rotor assembly includes impeller, and the impeller includes multiple blades and lower cover, it is characterised in that：The multiple blade Including linear leaf and short blade, the length of the linear leaf is more than the length of the short blade, and the linear leaf is along the lower cover Plate circumference array is distributed or is uniformly distributed, and the short blade is set between adjacent linear leaf, and the impeller further includes through-hole, institute It states through-hole and forms in the lower cover, the through-hole runs through the lower cover upper and lower surface, and the through-hole is set to adjacent institute Between stating linear leaf, the linear leaf includes the first convex side wall and the first concave side wall；It is directed to the through-hole and leads to described Two adjacent linear leafs of hole, it is respectively the first linear leaf and the second linear leaf, institute to define linear leaf described in above-mentioned two The the first convex side wall for stating the first linear leaf is arranged than the first concave side wall of first linear leaf closer to the through-hole, and described The first concave side wall of two linear leafs is arranged than the first convex side wall of second linear leaf closer to the through-hole, relative to First concave side wall of second linear leaf, first convex side wall of the through-hole closer to first linear leaf.

2. a kind of centrifugal pump, including rotor assembly, pump shaft, the rotor assembly can surround or turn with the pump shaft Dynamic, the rotor assembly includes impeller, and the impeller includes multiple blades and lower cover, it is characterised in that：The multiple blade Including linear leaf and short blade, the length of the linear leaf is more than the length of the short blade, and the linear leaf is along the lower cover Plate circumference array is distributed or is uniformly distributed, and the short blade is set between adjacent linear leaf, and the impeller further includes through-hole, institute It states through-hole and forms in the lower cover, the through-hole runs through the lower cover upper and lower surface, and the through-hole is set to adjacent institute Between stating linear leaf, the linear leaf includes the first convex side wall and the first concave side wall；It is directed to the through-hole and leads to described Two adjacent linear leafs of hole, it is respectively the first linear leaf and the second linear leaf, institute to define linear leaf described in above-mentioned two The the first convex side wall for stating the first linear leaf is arranged than the first concave side wall of first linear leaf closer to the through-hole, and described The first concave side wall of two linear leafs is arranged than the first convex side wall of second linear leaf closer to the through-hole, will be described Impeller to horizontal plane orthographic projection, the projection of the described first convex side wall of the center of the through-hole projection to first linear leaf The shortest distance be less than the through-hole center to second linear leaf the first concave side wall projection the shortest distance.

3. centrifugal pump according to claim 1 or 2, it is characterised in that：The linear leaf includes the first head and the first tail Portion, than first tail portion close to the impeller center, the short blade includes the second head and the second tail on first head Portion, than second tail portion close to the center of the impeller, the outer edge for defining the impeller is the first circle on second head Week, a diameter of first diameter of first circumference define one second circumference, second circumference and the second of the short blade The tangent setting in head, a diameter of second diameter of second circumference, the ratio etc. of the second diameter and the first diameter In 0.5 to 0.8, a third circumference is defined, the center of the through-hole is located at third circumference, a diameter of third of the third circumference Diameter, defines one the 4th circumference, the 4th circumference and the tangent setting in the first head, and a diameter of 4th of the 4th circumference is straight Diameter, the third diameter are more than the 4th diameter, and the third diameter is less than the second diameter.

4. centrifugal pump according to claim 3, it is characterised in that：The impeller includes at least two through-holes, described Total circulation area of through-hole is equal to the sum of the circulation area of each through-hole, and the area for defining first circumference is the first area, The ratio of total circulation area of the through-hole and first area is more than or equal to 0.003, total circulation area of the through-hole with The ratio of first area is less than or equal to 0.03.

5. centrifugal pump according to claim 3, it is characterised in that：The impeller includes at least two through-holes, described Total circulation area of through-hole is equal to the sum of the circulation area of each through-hole, and the area for defining first circumference is the first area, First area is more than or equal to 755mm²Less than or equal to 2018mm², total circulation area of the through-hole is more than or equal to 3mm²It is less than Equal to 40mm²。

6. centrifugal pump according to claim 4 or 5, it is characterised in that：The impeller includes at least 2 through-holes, often The circulation area of a through-hole is more than or equal to 0.8mm²Less than or equal to 8mm²。

7. according to the centrifugal pump described in claims 1 or 2 or 4 or 5, it is characterised in that：By the impeller to horizontal plane orthographic projection, Define a third circumference, the center of the projection of the through-hole is located at third circumference, for the through-hole and with the through-hole phase Adjacent the first linear leaf and the second linear leaf, the friendship of the third circumference and the projection of the first convex side wall of first linear leaf It is the first intersection point to put, and the intersection point of the third circumference and the projection of the first concave side wall of second linear leaf is the second intersection point, Circular arc between first intersection point and second intersection point is the first circular arc, first circular arc and the third circumference weight It closes, the midpoint for defining first circular arc is third intersection point, and the circular arc between the third intersection point and first intersection point is the Two circular arcs, second circular arc are overlapped with the third circumference, and the center of the projection of the through-hole is located in second circular arc.

8. centrifugal pump according to claim 3, it is characterised in that：By the impeller to horizontal plane orthographic projection, one the is defined The center of three circumference, the projection of the through-hole is located at third circumference, for the through-hole and adjacent with the through-hole first The intersection point of linear leaf and the second linear leaf, the third circumference and the projection of the first convex side wall of first linear leaf is first Intersection point, the intersection point of the projection of the first concave side wall of the third circumference and second linear leaf are the second intersection point, described first Circular arc between intersection point and second intersection point is the first circular arc, and first circular arc is overlapped with the third circumference, defines institute The midpoint for stating the first circular arc is third intersection point, and the circular arc between the third intersection point and first intersection point is the second circular arc, institute It states the second circular arc to overlap with the third circumference, the center of the projection of the through-hole is located in second circular arc.

9. centrifugal pump according to claim 6, it is characterised in that：By the impeller to horizontal plane orthographic projection, one the is defined The center of three circumference, the projection of the through-hole is located at third circumference, for the through-hole and adjacent with the through-hole first The intersection point of linear leaf and the second linear leaf, the third circumference and the projection of the first convex side wall of first linear leaf is first Intersection point, the intersection point of the projection of the first concave side wall of the third circumference and second linear leaf are the second intersection point, described first Circular arc between intersection point and second intersection point is the first circular arc, and first circular arc is overlapped with the third circumference, defines institute The midpoint for stating the first circular arc is third intersection point, and the circular arc between the third intersection point and first intersection point is the second circular arc, institute It states the second circular arc to overlap with the third circumference, the center of the projection of the through-hole is located in second circular arc.

10. centrifugal pump according to claim 7, it is characterised in that：The outer edge of the through-hole with closer to the through-hole The linear leaf the described first convex side wall minimum range be more than or equal to 0.8mm.

11. centrifugal pump according to claim 8 or claim 9, it is characterised in that：The outer edge of the through-hole leads to closer to described The minimum range of described first convex side wall of the linear leaf in hole is more than or equal to 0.8mm.

12. centrifugal pump according to claim 7, it is characterised in that：The outer edge of the through-hole with closer to the through-hole The short blade the second head minimum range be more than or equal to 0.8mm.

13. centrifugal pump according to claim 8 or claim 9, it is characterised in that：The outer edge of the through-hole leads to closer to described The minimum range of described first convex side wall of the linear leaf in hole is more than or equal to 0.8mm.

14. according to the centrifugal pump described in claims 1 or 2 or 4 or 5 or 8 or 9 or 10 or 12, it is characterised in that：The impeller is also Including upper cover plate, the upper cover plate is relatively fixed setting with the blade or integrated injection molding shapes.

15. centrifugal pump according to claim 3, it is characterised in that：The impeller further includes upper cover plate, the upper cover plate with The blade is relatively fixed setting or integrated injection molding forming.

16. centrifugal pump according to claim 6, it is characterised in that：The impeller further includes upper cover plate, the upper cover plate with The blade is relatively fixed setting or integrated injection molding forming.

17. centrifugal pump according to claim 7, it is characterised in that：The impeller further includes upper cover plate, the upper cover plate with The blade is relatively fixed setting or integrated injection molding forming.

18. centrifugal pump according to claim 11, it is characterised in that：The impeller further includes upper cover plate, the upper cover plate It is relatively fixed setting with the blade or integrated injection molding shapes.

19. centrifugal pump according to claim 13, it is characterised in that：The impeller further includes upper cover plate, the upper cover plate It is relatively fixed setting with the blade or integrated injection molding shapes.

20. centrifugal pump according to claim 1, it is characterised in that：

The linear leaf includes the first head and the first tail portion, and first head is than first tail portion closer to the impeller Center, the short blade include the second head and the second tail portion, and second head is than second tail portion closer to the leaf The center of wheel, the outer edge for defining the impeller are the first circumference, and a diameter of first diameter of first circumference defines one the Two circumference, the tangent setting in the second head of second circumference and the short blade, a diameter of the second of second circumference are straight Diameter, the second diameter and the ratio of the first diameter are equal to 0.5 to 0.8, define a third circumference, the center of the through-hole Positioned at third circumference, a diameter of third diameter of the third circumference defines one the 4th circumference, the 4th circumference and first The tangent setting in portion, a diameter of 4th diameter of the 4th circumference, the third diameter are more than the 4th diameter, the third Diameter is less than the second diameter；

The impeller includes at least two through-holes, total circulation area of the through-hole be equal to each through-hole circulation area it With the area for defining first circumference is the first area, the ratio of total circulation area of the through-hole and first area More than or equal to 0.003, total circulation area of the through-hole and the ratio of first area are less than or equal to 0.03；

The impeller includes at least two through-holes, total circulation area of the through-hole be equal to each through-hole circulation area it With the area for defining first circumference is the first area, and first area is more than or equal to 755mm²Less than or equal to 2018mm², Total circulation area of the through-hole is more than or equal to 3mm²Less than or equal to 40mm²；

The impeller includes at least 2 through-holes, and the circulation area of each through-hole is more than or equal to 0.8mm²It is less than or equal to 8mm²；

By the impeller to horizontal plane orthographic projection, the center of the projection of the through-hole is located at the third circumference, for described logical Hole and first linear leaf and second linear leaf adjacent with the through-hole, the institute of the third circumference and first linear leaf The intersection point for stating the projection of the first convex side wall is the first intersection point, first concave side of the third circumference and second linear leaf The intersection point of the projection of wall is the second intersection point, and the circular arc between first intersection point and second intersection point is the first circular arc, described First circular arc is overlapped with the third circumference, and the midpoint for defining first circular arc is third intersection point, the third intersection point and institute The circular arc stated between the first intersection point is the second circular arc, and second circular arc is overlapped with the third circumference, the projection of the through-hole Center be located in second circular arc；

The outer edge of the through-hole and the minimum range of the described first convex side wall of the linear leaf closer to the through-hole are big In equal to 0.8mm；

The outer edge of the through-hole and the minimum range on second head of the short blade closer to the through-hole are more than Equal to 0.8mm；

The impeller further includes upper cover plate, and the upper cover plate is relatively fixed setting with the blade or integrated injection molding shapes；

The linear leaf includes the first convex side wall and the first concave side wall, and the short blade includes the second convex side wall and the second concave side Wall, the lower cover include at least 2 mounting grooves, and circumferentially array distribution, the lower cover further include third to the mounting groove Convex side wall and third concave side wall, the described first convex side wall of the linear leaf and the first concave side wall respectively with the lower cover The convex side wall of the third and the third concave side wall be correspondingly arranged.