CN201269219Y - Guide vane - Google Patents

Abstract

The utility model discloses a guide vane, which is characterized by comprising a plurality of small vanes; the small vanes are arranged on an impeller hub which is connected with a pump shaft by keys; the thickness of the inflow end of each small vane is larger than that of the outflow end; and the thickness of the outflow end is near 0. The inlet setting angle of each small vane is 20 to 35 degrees. By adopting the technical proposal, the utility model effectively prevents the separation of boundary-layer flows; the boundary-layer flow formed on the small vane is taken to a main stream before being separated and then a new boundary-layer flow is formed; therefore, the slit fluidic vane centrifugal pump has better effect of eliminating trailing vortex resistance.

Description

A kind of guide vane

Technical field

The utility model relates to the centrifugal pump technical field, particularly a kind of guide vane.

Background technique

When traditional centrifugal pump moved, the whirlpool that flow of fluid produces in the impeller was one of main factor that causes hydraulic loss.As shown in Figure 1, the travelling forward of viscous friction stagnation fluid, and pressure stops that also fluid advances, fluid particle constantly slows down, and has stopped time at the S point finally.The fluid that stops is piled up at the S point, simultaneously because the K point pressure is higher than the S point pressure, fluid flows backwards under the adverse pressure gradient effect, is flowed to the S point and is turned back following current again and go under incoming flow impacts by the K point, so near obvious visible Maelstrom of formation S point.This whirlpool is separated boundary layer and vacuum side of blade from the S point, this just cries the separation in boundary layer.The boundary layer is left behind the vacuum side of blade the carrying of outflow and is floated downstream down and the fluid of back mixes whirlpool district of formation, is called the trailing vortex district.Because the appearance in trailing vortex district will cause the trailing vortex resistance that the motion blade is very big, it equals to act on pressure on the blade surface in the summation of coming flow path direction upslide shadow.In the viscous resistance of motion blade, when does not separate in the boundary layer, be based on frictional resistance, in a single day separation trailing vortex resistance that the boundary layer has still taken place just becomes and surfaces, and its big I is up to tens times of frictional resistance.This shows, design a kind of guide vane that can eliminate the trailing vortex resistance and seem particularly important.

The model utility content

Technical problem to be solved in the utility model provides a kind of guide vane, and this guide vane has extraordinary elimination trailing vortex resistance effect.

Technical problem to be solved in the utility model can be achieved through the following technical solutions:

A kind of guide vane is characterized in that, comprises a plurality of small leaf, and described small leaf is installed on pump shaft and is good on the impeller boss that is connected; The thickness of the end that becomes a mandarin of each sheet small leaf is greater than the thickness that goes out the stream end, and the thickness that goes out the stream end approaches 0.

The import laying angle of described each sheet small leaf is 20-35 °.

A plurality of small leaf have four.

The utility model is divided into blade and guide vane with the design of traditional blades waterpower, guide vane adopts a plurality of small leaf, utilize the energy process small leaf of main flow itself and the blocking zone that the slit between the blade is guided to the high-pressure liquid of pressure side suction surface, to the energy of the fluid feeding additional that blocked in the boundary layer, thereby prevent the segregation phenomenon of boundary layer flow.The boundary layer that forms on guide vane just is brought in the main flow when also not separating and has gone, and from the end that becomes a mandarin of blade, form a new boundary layer, than under the advantageous conditions, the new boundary layer of this kind will last till going out stream end trailing edge and not separating of blade always, thereby improve the efficient of impeller under the same operating mode effectively.

Description of drawings

Fig. 1 is the schematic representation that the blade suction surface of existing centrifugal pump forms the trailing vortex district.

Fig. 2 is a working principle schematic representation of the present utility model.

Fig. 3 is that the utility model guide vane is installed in the structural representation on the centrifugal pump impeller.

Fig. 4 is the left view of Fig. 3.

Embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.

Referring to Fig. 2, Fig. 3 and Fig. 4, a kind of guide vane is installed in pump shaft and is good on the impeller boss 1 that is connected.Originally just be provided with four blades 2 on the impeller boss 1.Certainly the quantity of blade 2 also is not limited to four, can be other quantity, and this mainly requires to be provided with according to characteristic of centrifugal pump design.The quantity of the small leaf that guide vane comprises is corresponding with the quantity of blade 2 also to be 4.Blade 2 does not have any difference in the position of impeller boss 1 and the shape of blade 2 with size and existing blade, and this point is not an emphasis of the present utility model, and right and wrong Changshu is known to those skilled in the art, therefore is not described in detail at this.Also comprise a front shroud 3 as centrifugal pump impeller, this front shroud 3 be by four screw screwing in from impeller boss 1 back pressure face on impeller boss 1.

Four small leaf 4 can adopt integrated mode to be molded directly within on the impeller boss 1, also can as the mode of Fig. 3 and Fig. 4 by the screw that screws in from impeller boss 1 back pressure face on impeller boss 1, perhaps adopt the mode of welding to install.Certainly the utility model should preferentially adopt integrated mode to be molded directly within on the impeller boss 1 under the prerequisite of process conditions permission.

The mounting point of small leaf 4 still is described in conjunction with Fig. 3 and Fig. 4 when the utility model, at first have four identical blind holes of quantity and four blades 2 from the pressure surface of impeller boss 1, have two or more small through hole at the bottom of the hole of each blind hole, so that pass in order to two or more screws that small leaf 4 is installed.Adopting two or more screw main purposes is disposablely to install small leaf 4, if only adopt a screw, just need between small leaf 4 and impeller boss 1, a position structure be set, so correspondingly can cause the increase of whole guide vane cost.

The structure of four small leaf 4 is all identical, all is to be made of a blade body 41 and a Cylindrical object 42, has two or more screws on Cylindrical object 42.When Cylindrical object 42 is inserted in the blind hole of impeller boss 1, pass in the screw that impeller boss 1 is screwed into Cylindrical object 42 with two or more screws, four small leaf 4 can be installed on the impeller boss 1.

Four small leaf 4 are distributed on the impeller boss 1, each small leaf 4 is positioned at the become a mandarin inboard of end 21 of corresponding blade 2, referring to Fig. 2, has certain slit 5 between the suction surface 23 of guide vane body 41 pressure sides 413 of small leaf 4 and corresponding blade 2, slit 5 width are 3-8mm, and this slit length is 5～10mm.After this slit 5 is set, the energy that utilizes main flow itself is guided to the blocking zone of blade 2 suction surfaces 23 through slit 5 with the high-pressure liquid of pressure side, to the energy of the fluid feeding additional that blocked in the boundary layer, thereby prevents the segregation phenomenon of boundary layer flow.The boundary layer that forms on small leaf 4 just is brought in the main flow when also not separating have been gone, and hold 21 from becoming a mandarin of blade 2, form a new boundary layer, than under the advantageous conditions, the new boundary layer of this kind will last till going out stream end 22 trailing edges and not separating of blade 2 always, thereby improve the efficient of impeller under the same operating mode effectively.

Blade body 41 be shaped as similar fairshaped wing shapes, pressure side 413 is streamlined, suction surface 414 is near a plane, the thickness of the end 411 that becomes a mandarin of blade body 41 is greater than the thickness that goes out stream end 412, preferred version is that the thickness that stream end 412 approaches 0.

Find that in practice process the import laying angle of blade body 41 is taken as consistent with traditional waterpower design, with the efficient that mainly improves pump about 5～10%; When the design of the import laying angle of guide vane body 41 designed big 6～12 ° than traditional waterpower, then the pump operation optimal working point was partial to large-capacity point, and efficient traditional waterpower optimum condition of comparing improves about 5～10%.Therefore the import laying angle of the utility model guide vane body 41 is 20-35 °.

With reference to figure 2, the utility model is divided into blade 2 and four small leaf 4 with the design of traditional blades waterpower, utilize the energy process small leaf 4 of main flow itself and the blocking zone that the slit 5 between the blade 2 is guided to the high-pressure liquid of pressure side suction surface, to the energy of the fluid feeding additional that blocked in the boundary layer, thereby prevent the segregation phenomenon of boundary layer flow.The boundary layer that forms on the A-B section of guide vane 4 just is brought in the main flow when also not separating have been gone, and from the C point, forms a new boundary layer, and than under the advantageous conditions, the new boundary layer of this kind will last till trailing edge (D point back) always and not separate.

Can understand the efficient of XA40/32 type pump product under the 2900r/min rotating speed that is applied to guide vane of the present utility model from table 1 all obviously improves in the efficient of different industrial and mineral points.

Performance data contrast before and after table 1 pump product technology is improved

More than show and described basic principle of the present utility model, major character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; the utility model also has various changes and modifications under the prerequisite that does not break away from the utility model spirit and scope, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims (3)

1. a guide vane is characterized in that, comprises a plurality of small leaf, and described small leaf is installed on pump shaft and is good on the impeller boss that is connected; The thickness of the end that becomes a mandarin of described each sheet small leaf is greater than the thickness that goes out the stream end, and the thickness that goes out the stream end approaches 0.

2. a kind of guide vane according to claim 1 is characterized in that, the import laying angle of described each sheet small leaf is 20-35 °.

3. a kind of guide vane according to claim 1 is characterized in that, described a plurality of small leaf have four.

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