CN101105181B

CN101105181B - Impeller of pump

Info

Publication number: CN101105181B
Application number: CN2006101063450A
Authority: CN
Inventors: L·伊尔韦斯
Original assignee: Grundfos Management AS
Current assignee: Grundfos Management AS
Priority date: 2006-07-14
Filing date: 2006-07-14
Publication date: 2010-06-16
Anticipated expiration: 2026-07-14
Also published as: CN101105181A

Abstract

A pump-used impeller for pumping liquid substance such as waste water is provided. The impeller comprises a main body (1) and at least one flow passage (2, 12) with arced shape, wherein the flow passage has smoothly arced shape. The invention is characterized in that in the last part of the flow passage, the flow passage (2, 12) is converged with itself or converged with another flow passage whenthe impeller has more than one flow passages; and the ratio of the diameter (D1) of the impeller (1) and the average diameter (D2) of the flow passage is in the range of 1.5-4.

Description

Impeller of pump

Technical field

The present invention relates to a kind of impeller of pump, it is used for the liquid of pumping such as waste water, and described impeller (impeller) comprises that at least one is the runner of space bending shape.

Background technique

The existing centrifugal pump impeller that is used for pumping liquid has the wheel hub of outer cover and rotational symmetry structure, and has one or more spiral blades that for example are between them, is used for forming in impeller one or more curvature of space runner.

Except liquid water, also comprise solid waste in the waste water, such as cloth waste sheet and other solid fragment.When pumping waste water, perhaps agglomerating owing to these solid debris can adhere on the blade of impeller of pump in the impeller inner accumulated, so these solid debris can cause the interruption of work and the power loss in the pump.Therefore, the runner of the impeller of waste water pump has big cross-section area usually, can not stop up this pump by this runner to allow king-sized solid.And in order to realize more effective flow and in order to reduce the risk of obstruction, the blade of this impeller also is configured as the thickness that makes its middle part thickness greater than the place, end.A kind of like this impeller for example is disclosed in the specification of Swedish patent 426976.As putting down in writing in the U. S. Patent 4347035, also might be that the leading edge of impeller is become sharply for example, make it solid in waste water can be cut into littler fragment.

Be used for the impeller of the existing centrifugal pump of pumping waste water at another kind, the leading edge of this impeller blade has a kind of shape that tilts very much, makes that this pump is difficult for stopping up.A kind of like this impeller for example is disclosed in Canadian patent application 2254187 and 2253067.

Owing to used blade in existing impeller, therefore, the liquid that flows into impeller can run into the edge of blade when entering impeller, and is divided into two strands of independent liquid streams that are positioned on the blade two opposite sides.This has caused extra work and has caused extra power consumpiton simultaneously.In addition, the solid waste fragment can adhere to the edge of this blade.

B. P. 687514 discloses a kind of impeller that is used for centrifugal pump, and it has a runner, and this runner comprises first axial component that is parallel to the suction mouth and is in second lateral part in the outlet passage plane.This runner has a sharp turn section between these two-part.

In this existing impeller, runner can not run into it and control oneself.For example, in B. P. 678514, this runner can not run into its oneself, but can run into another object, i.e. the periphery of this impeller.

Disclose a kind of hollow impellers that is used for waste water pump in the specification of D.B.P. 3211230, be formed with helical flow path in it.

Existing impeller has poor performance, and the solid waste fragment can cause the interruption and the power loss of work.

Summary of the invention

The objective of the invention is to overcome the shortcoming of existing scheme, and realize a kind of novel impeller of pump that is used for pumping waste water fully, make it might obtain a kind of simple structure and the acquisition performance well more a lot of than existing impeller.

The structure of impeller of pump of the present invention is based on such design, that is, in the design of impeller of pump of the present invention, it is not the blade shape that limits as existing impeller design between outer cover and the wheel hub, but limits the shape of runner.This can realize that cross section is along this curvilinear motion by limiting a space curve.

Impeller of the present invention is characterised in that it has uniformly continuous structure; In other words, it does not have actual blade structure.In addition, this runner has gently (evenly) crooked shape, that is, it does not have the rapid bending that is caused by blade etc.; And different with existing runner, this runner is at its tail end place and himself converge, and perhaps converges with another runner under impeller has the situation of many runners, forms the structure that is similar to blade trailing edge at this point place.And the cross section of this runner keeps constant or gently changes, and on shape and/or cross-section area without any rapid variation.Provided in the details of these features of the impeller of the present invention claim hereinafter.Further, the ratio between impeller diameter and the Flow diameter is useful between 2～4.

By using the present invention, just may realize almost can anticlogging waste water impeller, even and when pumping contained the liquid of solid or fiber, this impeller also had very high performance.This impeller does not have blade, therefore in the entry zone that flows, just be not similar to the structure of blade inlet edge yet, the result just can not form any stagnant point (the leading edge place at blade in existing pump is formed with stagnant point usually) there yet, can not produce any low pressure in the pump port zone yet.Therefore, the impeller of this design also has good suction properties, and is not prone to cavitation phenomenon (cavitation).

Description of drawings

Hereinafter, describe the present invention in detail by example with reference to the accompanying drawings, wherein:

Fig. 1 shows the side view of impeller of the present invention;

Fig. 2 shows the stravismus top view of impeller of the present invention;

Fig. 3 shows the lateral cross section of impeller of the present invention along the SOLAO-SOLAO of Fig. 1;

Fig. 4 shows the vertical cross-section of extracting along its middle part of impeller of the present invention;

Fig. 5 shows another impeller of the present invention.

Embodiment

Fig. 1-Fig. 4 shows impeller of the present invention, and it is used for centrifugal pump, in particular for the centrifugal pump of pumping waste water.This impeller has the main body made from the cast metal 1, and this main body 1 has curvature of space runner 2.Upper end in this main body 1 has a circular pump port 3, and the size of this pump port 3 is corresponding to the diameter of water inlet waste water pipe, and waste water flows through this pump port 3 from this waste water pipe.In addition, this impeller also has the hole of passing for live axle 4.

In the design of impeller of the present invention, define the shape of runner 2.This can realize by giving the line 5 (dot and dash line) that fixes on space bending on the flow direction, have the cross section A of constant or slow variation along this line 5.This cross section A can be a circle as shown in Figure 4.Advance along this curve 5, the edge of the edge 6 (dotted line) of the edge limited runner 2 of this cross section and the imaginary prolonged section of runner, such just as shown in drawings.

Curve 5 can be such helix, that is, it at first has a vertical part in the center of pump port 3, and vertically part is along the direction extension of this impeller middle spindle line for this, and it begins the curvature of space spirality afterwards.This line 5 has the curvature of space, is different from plane curve in this.In addition, its curvature is mild and continuous, that is to say, its radius of curvature remains at least approximate identical, thus in the runner without any rapid bending.The shape of this flow channel cross-section A and area can change gently and continuously, also are different from existing technical scheme in this.Like this, the direction in waste water longshore current road flows continuously.Final and himself converge or have under the situation of many runners when converging when extending before the runner screw with another runner, formed the structure that is similar to blade trailing edge at this some place.As shown in Figure 3, the wall 7 between runner 2 different pieces is thicker at impeller in center.

And main body 1 has uniformly continuous structure and not such as the absolute construction of outer cover, wheel hub or blade structure.

Fig. 5 shows according to another kind of impeller of the present invention, and it is designed to be used in particular for the centrifugal pump of pumping waste water.It has cast metal body, and this main body comprises the runner 12 of the such curvature of space of image pattern 1-Fig. 4.Upper end in this main body has circular pump port 13, and the size of this pump port 13 is corresponding to the diameter of water inlet waste water pipe, and waste water flows through this pump port 13 from this waste water pipe.In addition, this impeller also has the through hole that is used for live axle.In this scheme, the cross section A1 of runner changes to such shape from being essentially circle, promptly the outer wall 14 of this runner is straight basically at runner and the place himself converged, therefore the cross section of this runner has the shape (see figure 5) of alphabetical D, afterwards, it is straight that inner edge 15 also begins to become, and also be straight at the tail end place of runner, so the cross section of this runner has rectangular shape.

When the diameter of cast metal body 1 is D1 and the diameter of runner when being D2, notice that the ratio (D1/D2) of impeller diameter and Flow diameter is useful between 2～4.

For a person skilled in the art clearly, various mode of executions of the present invention are not limited to above-mentioned example, but change in the scope of described claim hereinafter.

Claims

1. an impeller of pump is used for the pumping liquid, and described impeller comprises that main body (1) and at least one is the runner of space bending shape (2,12), and wherein this runner is the broad warp shape, it is characterized in that,

In the decline of this runner, this runner (2,12) converges with himself or converges with another runner under this impeller has more than the situation of a runner; And the ratio of the diameter (D2) of the diameter of this impeller (D1) and this runner is in 2～4 scope.

2. impeller of pump according to claim 1 is characterized in that, the radius of curvature of this runner keeps substantially constant or gently changes.

3. impeller of pump according to claim 1 is characterized in that, the shape of runner (2) on flow direction determined based on space curve (5); When this runner during along this curve, the edge limited edge (6) of this runner (2) of the cross section of this runner.

4. impeller of pump according to claim 3 is characterized in that, the shape of this curve (5) is essentially spirality at least.

5. impeller of pump according to claim 1 is characterized in that its structure is uniformly continuous, and without any absolute construction.

6. impeller of pump according to claim 1 is characterized in that, (A is constant or smooth variation A1) to the cross section of this runner.

7. impeller of pump according to claim 6 is characterized in that, the cross section of this runner becomes such shape from circular variation the basically, and promptly this shape makes it is that the outer wall (14) of this runner is straight basically at least in this decline.

8. according to claim 6 or 7 described impeller of pump, it is characterized in that the inwall of this runner (15) is straight also substantially, makes the cross section of this runner be essentially rectangle in this decline in the decline of runner.

9. impeller of pump according to claim 5 is characterized in that, described absolute construction is outer cover, wheel hub and/or blade structure.

10. impeller of pump according to claim 8 is characterized in that, the inwall of this runner (15) also is straight at the tail end of runner substantially.

11. impeller of pump according to claim 1 is characterized in that, described liquid is a waste water.