CN1714246A

CN1714246A - Centrifugal pump

Info

Publication number: CN1714246A
Application number: CNA2003801036439A
Authority: CN
Inventors: 安德斯·拉松
Original assignee: Volvo Lastvagnar AB
Current assignee: Volvo Truck Corp
Priority date: 2002-11-19
Filing date: 2003-11-07
Publication date: 2005-12-28
Also published as: BR0316422A; WO2004046558A1; SE524642C2; SE0203433D0; SE0203433L; EP1567773A1; JP2006506578A; AU2003276796A1

Abstract

The invention relates to a centrifugal pump with an impeller (10) which is rotatable in a direction of rotation (14) in a pump housing. This impeller comprises an essentially circular-disk-shaped carrier (11) with a number of blades (13) arranged at an angle out from the disk plane. At least one of the blades (13) of the impeller extends with a first curved portion (15) which is concave in said direction of rotation (14) and a second curved portion (16) which is convex in said direction of rotation. The first curved portion extends from the inner radial edge (17) to the second curved portion. The second curved portion extends from the first curved portion in the direction of the outer radial edge (18).

Description

Centrifugal pump

Technical field

The present invention relates to a kind of centrifugal pump that has impeller, this impeller is rotatable in pump casing, along sense of rotation, and including a discoidal substantially bearing that has many blades, described blade extends between internal diameter edge and external diameter edge from the outside layout at an angle of disc face and with a kind of crooked basically shape.

Background technique

Centrifugal pump has many applications, such as, be used for extracting in a fixed manner various media or to they pressurizations, perhaps be used for the cooling liquid between the thermal source and cooling equipment in engine-driven land vehicle and boats and ships (aircraft) extraction cooling system.At heavy vehicle, in the application such as truck, MANUFACTURER is generally client's sampling scope, this sample scope includes many different engine size, every kind of engine type has the various power grades of suitable needs by device variations, and the selection of modification has direct influence to the flow operating mode of cooling system.The example of the equipment of this suitable needs has, motor and gear box oil cooler, intercooler, EGR gas cooler and retarder cooler.

It is optimized that centrifugal pump is usually designed to given speed and given flow.If pump is operated outside standard, cavitation may take place, another kind may be that unnecessary power loss takes place.Therefore, in order to contain needs, need the classification of different water pumps.In addition, may make the ratio coupling between live axle and the pump, such as variation by the gear ratio in the speed-changing gear box.It is desirable to, concerning the MANUFACTURER of heavy vehicle, may use the same standard element,, be used for than current more modification such as water pump.In addition, if these adapt to revise the replacement that does not relate to coolant pump, revising the vehicle that has used so will be easier, such as needing or the applying working condition coupling with new environment.

Summary of the invention

Therefore an object of the present invention is to produce a kind of centrifugal pump, it can be in the velocity range of broad, work enduringly in the range of flow of broad, and keeps high efficiency under such operating mode.

For this reason, be characterised in that according to centrifugal pump of the present invention, at least one blade of impeller extends and has at recessed first curved section of described sense of rotation with at second curved section of described sense of rotation projection, first curved section extends to second curved section from the internal diameter edge, second curved section in the external diameter edge direction from the first curved section extension.This design of impeller blade causes in the range of flow of the velocity range of broad and broad higher efficient being arranged simultaneously.

Favourable exemplary embodiment of the present invention occurs in the dependent claims.

Description of drawings

Exemplary embodiment below with reference to the accompanying drawings describes the present invention in detail, wherein

Fig. 1 is at the plan view according to the impeller that uses in the centrifugal pump of the present invention;

Fig. 2 be along the cross section of Fig. 1 center line II-II and

Fig. 3 is used to adopt according to efficient under the friction speed of the pump-unit of centrifugal pump of the present invention and the relation between the flow with caption.

Embodiment

Impeller 10 shown in Fig. 1 comprises a disc bearing 11, and this disc bearing 11 has a center hub 12 and a plurality of blade 13 that is arranged in the hub periphery.These blades are given prominence on disc face at a certain angle, and extend between internal diameter edge and external diameter edge with the shape of basic bending.Impeller 10 is used in the pump casing (not shown), and this pump casing is installed on the short live axle by its hub 12.In this respect, the inlet of pump casing points to straight disc face facing to impeller boss 12 with the right angle basically.The outlet of pump casing is tangentially stretched basically from the external diameter edge of impeller, is parallel to disc face.

Impeller 10 is arranged to rotate along the direction that arrow among Fig. 1 14 is indicated.Blade 13 extends and has at recessed first curved section 15 of described sense of rotation with at second curved section 16 of this sense of rotation projection.The length of first curved section approximately is 1/3rd of second curved section.Blade extends to outward edge 18 from the internal diameter 17 of bearing 11.The internal diameter 17 inlet the inside that is positioned at pump casing radially, with dashed lines circle 19 explanations in Fig. 1.Blade periphery head portion farthest can be a conical design.Utilize the advantage according to the design of blade 13 of the present invention, liquid is transported to the recessed portion of blade efficiently, and this part is configured as the risk that reduces cavitation.

As shown in Figure 2, the blade shown in the exemplary embodiment with respect on the disc face of bearing at blade face to the side of the sense of rotation about 80 ° angle 20 that tilts.This angle can than shown in smaller or more greatly.The another kind of selection is that blade can be design crooked on sense of rotation.Therefore many variations are possible, such as, the average tilt angle of blade can change between about 45 ° and about 87 °.

In addition, there is the plane of inclination 21 of its most advanced and sophisticated directed sense of rotation at the edge of the relative carrier disk of blade.Shown in exemplary embodiment in, this plane of inclination becomes about 10 ° of angles with respect to the disc face of bearing, but this angle 22 can change between about 3 ° and about 30 °.Have been found that this inclined-plane reduces the risk of cavitation when efficient increases.

In above-mentioned exemplary embodiment, impeller is arranged to rotate in pump casing, and blade and pump casing wall influence each other, the disc face of the parallel and close bearing of pump casing wall.In another alternate embodiments (not shown), impeller can comprise a disk, and this disk is parallel to the disc face of bearing, is connected to blade and is provided with the center inlet opening.Adopt at impeller under the situation of this mode " sealing ", blade needn't tilt as above-mentioned.

Curve shows shown in Fig. 3 under four kinds of friction speeds, from about 1500rpm to about 3500rpm, the relation between efficient and the flow.As can be seen, when flow Q changed between 6l/s and 14l/s, efficient can remain on about 65% from curve.Therefore, can in the application of the flow/pressure decline of many different variations, use according to one and same pump of the present invention, and with in the higher efficient running, the gear of pump is than deacclimatizing different application especially in pump can the velocity range at broad.

The present invention is considered to be not limited to above-mentioned exemplary embodiment, but can expect a large amount of further variation and modification in the scope of patent claims below.Such as, all blades 13 of impeller needn't have duplicate shape, but can expect, such as, every other blade can be made than illustrated weak point, and effect of the present invention can not lost fully.

Claims

1. centrifugal pump that has impeller (10), this impeller can rotate along sense of rotation (14) in pump casing, and comprise a discoidal substantially bearing (11) that has many blades (13), described blade is outwards arranged at an angle from disc face, and between internal diameter edge (17) and external diameter edge (18), extend with crooked basically shape, it is characterized in that, at least one blade (13) of described impeller extends and has at recessed first curved section (15) of described sense of rotation (14) with at second curved section (16) of described sense of rotation projection, first curved section extends to second curved section from internal diameter edge (17), second curved section in external diameter edge (18) direction from the first curved section extension.

2. centrifugal pump as claimed in claim 1 is characterized in that, first curved section (15) is shorter than second curved section (16).

3. centrifugal pump as claimed in claim 2 is characterized in that, the length of first curved section (15) blade (13) total length 1/10 and 2/5 between.

4. as any one described centrifugal pump in the claim 1 to 3, it is characterized in that blade (13) is along at least a portion of its length, at blade face the side of sense of rotation (14) is tilted less than 90 ° angle (20) with respect to the disc face of bearing.

5. centrifugal pump as claimed in claim 4 is characterized in that, described tilt angle (20) are between about 45 ° to about 87 °.

6. as any one described centrifugal pump in the claim 1 to 5, it is characterized in that blade (13) edge of bearing (11) relatively has its most advanced and sophisticated plane of inclination (21) of pointing to sense of rotation (14).

7. centrifugal pump as claimed in claim 6 is characterized in that, described plane of inclination (21) become an angle (22) with respect to the disc face of bearing, and this angle is between about 3 ° and about 30 °.

8. as any one described centrifugal pump in the claim 1 to 7, it is characterized in that, impeller (10) is arranged to rotate in pump casing with blade (13), and described blade (13) interacts with the pump casing wall, the disc face of the parallel and close bearing (11) of this pump casing wall.

9. centrifugal pump as claimed in claim 1 is characterized in that, impeller (10) comprises a disk, and this disk is parallel to the disc face of bearing (11), is connected to blade (13) and is provided with the center inlet opening.