RU2676168C1 - Guide vane for centrifugal multi-stage pump - Google Patents

Abstract

FIELD: engines and pumps.SUBSTANCE: invention relates to pump engineering, namely, to designs of guide vanes (GV) of multistage centrifugal pumps. GV contains a disk with guide blades (GB) made on one side of the disk and back blades (BB) made on the other side of the disk. Each GB is conjugated according to the outer diameter of the disk with the corresponding BB with the formation on either side of the disk of guide and reverse channels interconnected. GB input edges are located along the circumference with the formation of input sections of guide channels, covering with a gap output sections of the channels formed by blades of pump impeller. In cross section, the GB profile is made with inlet, middle and exit sections. Entrance section of the GB is made at an acute angle to tangent circle, along which entrance edges of GB are located. In cross section, the entrance edge of each GB is formed by an arc of circle mated with straight lines forming inlet section of the concave and convex sides of the GB and are angled to each other with the formation of increasing thickness from inlet edge of GB entrance section. Straight line forming GB convex side, with radius of the circle along which GB entrance edges are located, the angle α. Middle section of concave and convex sides of GB is formed by circular arcs. Radius of the arc of a circle forming middle portion of the GB convex side is smaller than the radius of the arc of a circle forming middle portion of GB concave side. Output section of GB concave side is formed by straight line forming circle with the radius along which input edges of the GB are located, the angle β. Straight line of entrance section of convex side of the GB with the straight line of the output section of concave side of neighboring GB constitute an angle γ, with the formation of guide channel section expanding along the flow of the working medium. BB output edges are located along circumference with the formation of output sections of return channels. In the cross section, the exit edge of each BB is formed by an arc of a circle mated with circular arcs that form output and inlet portions of concave and convex sides of the BB. Radius of the arc of a circle forming exit portion of the convex side of the BB is larger than radius of the arc of a circle forming entry portion of BB convex side. Guiding vane is designed as a single part with six evenly spaced around the circle of GB and BB. Radii passing through entrance and exit edges of each BB, form an angle λ.EFFECT: invention is aimed at reducing hydraulic resistance in engine flow path.1 cl, 3 dwg

Description

The invention relates to a pump engineering industry, and in particular to designs of guide vanes of centrifugal pumps.

Known for directing the apparatus of a centrifugal borehole multi-stage pump, containing the upper and lower disks with a through axial hole in each, ribs forming guide channels, an annular housing element and an end liner, a lower disk with ribs, an annular housing element with an upper disk and an end liner made in the form three separate parts, with the end liner adjacent to the lower surface of the upper disk, each rib is continuously moving from the upper to the side and then to the lower part of the lower its disk, and the guide channels form parabolic fluid flow lines (see certificate for utility model RU No. 35392, class F04D 29/44, publ. 10.01.2004).

However, this guide vane has a relatively complex design, which narrows the scope of its use.

The closest to the invention in technical essence and the achieved result is a guide vane of a centrifugal multistage pump, comprising a disk with guide vanes made on one side of the disk and reverse vanes made on the other side of the disk, each guide vane being mated at the end of the disk with its corresponding guide vane with the formation on one side of the disk of guide channels and reverse channels on the other side of the disk, interconnected (see patent for the invention RU No. 2220330, class F04D 29/44, publ. 12/27/2003).

This design of the guide vane allows you to reduce vibration, reduce dimensions and simplify the manufacture of the guide vane. However, this design does not allow to reduce the hydraulic resistance of the flow part to the desired value.

The technical problem solved in this invention is the elimination or reduction of the above disadvantages.

The technical result consists in the fact that it is possible to reduce the hydraulic resistance in the flowing part of the guide apparatus.

The indicated technical problem is solved, and the technical result is achieved due to the fact that the guide apparatus of the centrifugal multistage pump contains a disk with guide vanes made on one side of the disk and reverse vanes made on the other side of the disk, each guide vane is mated along the outer diameter of the disk with its corresponding reverse blade with the formation on one side of the disk of guide channels and reverse channels on the other side of the disk, interconnected, input the holes of the guide vanes are located along the circumference with the formation of the input sections of the guide channels, covering with a gap the output sections of the channels formed by the blades of the impeller of the centrifugal pump, and in the cross section the profile of the guide vanes is made with the input, middle and output sections, the input section of the guide vanes is made under sharp angle to the tangent of the circle along which the input edges of the guide vanes are located, in cross section the input edge of each guide vanes Attack is formed by an arc of a circle conjugated with straight lines forming the input section of the concave and convex sides of the guide vanes and is made at an angle to each other with the formation of an increase in thickness from the input edge of the input section of the guide vanes, and the straight line forming the convex side of the guide vanes is the radius of the circle along which the input edges of the guide vanes are located, the angle α ranging from 97 ° to 98 °, the middle section of the concave and convex sides of the guide vanes ok is formed by circular arcs, with the radius of the circular arc forming the middle portion of the convex side of the guide vanes being 1.7-1.8 times smaller than the radius of the circular arc forming the middle portion of the concave side of the guide vanes, and the outlet portion of the concave side of the guide vanes is formed by a straight line forming with a radius of a circle along which the input edges of the guide vanes are located, an angle β of 58 ° to 59 °, the straight line of the inlet portion of the convex side of the guide vanes is straight the line of the output section of the concave side of the adjacent guide vanes has an angle γ of 6 ° to 7 °, with the formation of a section of the guide channel expanding along the flow of the working medium, the output edges of the return vanes are located along the circle with the formation of output sections of the return channels, and the output cross section the edge of each back vanes is formed by an arc of a circle conjugated with arcs of a circle forming the output and input sections of the concave and convex sides of the back vanes, the radius of the arc is the radius forming the exit section of the convex side of the return vanes is 2.6-2.7 times larger than the radius of the arc of a circle, forming the entrance region of the convex side of the return vanes, the guide apparatus is made in the form of a single part with six guides and return vanes evenly spaced around the circumference, and the radii passing through the inlet and outlet edges of each back vanes form an angle λ of 110 ° to 112 °.

In the course of the study, it was found that it is possible to optimize the flow part of the guide apparatus by providing a smoother conversion of the kinetic energy of the flow into potential pressure energy, which is achieved by forming the flow part with less local hydraulic losses, which allows the flow to be directed in the manner described above pumped working medium with the required speed and pressure.

In FIG. 1 shows a view of the guide apparatus from the side of the guide vanes.

In FIG. 2 shows a section aa in FIG. one

In FIG. 3 shows a view of the guide apparatus from the side of the return vanes.

The directing apparatus of a centrifugal multistage pump comprises a disk 1 with guide vanes 2 made on one side of the disk 1 and return vanes 3 made on the other side of the disk 1.

Each guide vane 2 is mated along the outer diameter of the disk 1 with its corresponding return blade 3 with the formation of guide channels 4 and reverse channels 5 on the other side of the disk 1, communicated with each other.

The input edges 6 of the guide vanes 2 are located along the circumference with the formation of the input sections of the guide channels 4, covering with a gap the output sections of the channels formed by the impeller vanes (not shown in the drawing) of the centrifugal pump.

In cross section, the profile of the guide vanes 2 is made with inlet, middle and outlet sections.

The input portion of the guide vanes 2 is made at an acute angle to the tangent circle along which the input edges 6 of the guide vanes 2 are located.

In cross section, the input edge 6 of each guide vane 2 is formed by an arc of a circle conjugated with straight lines 7 and 8, forming the input section of the convex and concave sides of the guide vanes 2 and made at an angle to each other with the formation of the input section increasing in thickness from the input edge 6 guide vanes 2. A straight line 7, forming the convex side of the guide vanes 2, is with a radius of a circle along which the input edges 6 of the guide vanes 2 are located, an angle α of 97 ° d 98 °,

The middle portion of the concave and convex sides of the guide vanes 2 is formed by circular arcs, the radius R1 of the circular arc forming the middle portion of the convex side of the guide vanes 2 being 1.7-1.8 times smaller than the radius R2 of the circular arc forming the middle portion of the concave side of the guide vanes 2.

The output portion of the concave side of the guide vanes 2 is formed by a straight line 9, forming with a radius of a circle along which the input edges 6 of the guide vanes 2 are located, an angle β of 58 ° to 59 °, and a straight line 7 of the input portion of the convex side of the guide vanes 2 is with a straight line 9 of the output section of the concave side of the adjacent guide vanes 2, an angle γ of 6 ° to 7 °, with the formation of the section of the guide channel 4 expanding along the flow of the working medium.

The output edges 10 of the return vanes 3 are located along a circle with the formation of the output sections of the return channels 5. In the cross section, the output edge 10 of each return vanes 3 is formed by an arc of a circle conjugated with circular arcs forming the output and input sections of the concave and convex sides of the return vanes 3. Radius R3 of the arc of the circle forming the outlet portion of the convex side of the return vanes 3 is 2.6-2.7 times larger than the radius R4 of the arc of the circle forming the entrance portion of the convex side of the return vanes 3.

The guide apparatus is made in the form of a single part with six guide rails 2 and return 3 vanes evenly spaced around the circumference, and the radii passing through the input and output 10 edges of each return vanes 3 form an angle λ ranging from 110 ° to 112 °.

During operation of the centrifugal pump, the pumped working medium enters from the impeller into the guide channels 4 formed by the guide vanes 2, and then into the return channels 5 formed by the return vanes 3 of the guide vanes. In channels 4 and 5 of the guide vane, the kinetic energy of the liquid is partially converted into potential pressure energy, which allows the impeller and the guide vane to work together to create the required head of the centrifugal pump stage and to form a fluid flow at the outlet of the guide vane and the entrance to the next impeller of the next stage with the required pressure and speed and at the optimal swirl angle of the working fluid flow, which ultimately allows to increase the efficiency of the centrifugal pump.

Claims (1)

A guide vane of a centrifugal multistage pump, comprising a disk with guide vanes made on one side of the disk and reverse vanes made on the other side of the disk, each guide vane being mated along the outer diameter of the disk with its corresponding return vane with the formation of guide channels and return channels on one side of the disk on the other side of the disk, interconnected, characterized in that the input edges of the guide vanes are located along the circumference with the formation the input sections of the guide channels, covering with a gap the output sections of the channels formed by the blades of the impeller of the centrifugal pump, and in the cross section the profile of the guide vanes is made with the input, middle and output sections, the input section of the guide vanes is made at an acute angle to the tangent circle along which are located the input edges of the guide vanes, in cross section the input edge of each guide vanes is formed by an arc of a circle conjugated with straight lines, the image the input section of the concave and convex sides of the guide vanes, and are made at an angle to each other with the formation of increasing in thickness from the input edge of the input section of the guide vanes, and the straight line forming the convex side of the guide vanes is with a radius of a circle along which the input edges guide vanes, an angle α ranging from 97 ° to 98 °, the middle portion of the concave and convex sides of the guide vanes is formed by circular arcs, the radius of the circular arc being the middle portion of the convex side of the guide vanes is 1.7-1.8 times smaller than the radius of the circular arc forming the middle portion of the concave side of the guide vanes, and the outlet portion of the concave side of the guide vanes is formed by a straight line forming with a radius of a circle along which the input the edges of the guide vanes, an angle β of 58 ° to 59 °, the straight line of the inlet portion of the convex side of the guide vanes is with the straight line of the outlet portion of the concave side of the adjacent guide vanes the angle γ, which is from 6 ° to 7 °, with the formation of a section of the guide channel expanding along the working medium flow, the output edges of the return vanes are located along the circle with the formation of output sections of the return channels, and in the cross section the output edge of each back vanes is formed by an arc of a circle conjugated to circular arcs forming the output and input sections of the concave and convex sides of the back vanes, the radius of the arc of a circle forming the output section of the convex side of the back vanes, 2.6-2.7 times the radius of the arc of a circle forming the inlet portion of the convex side of the return vanes, the guide apparatus is made as a single part with six guide rails and return vanes evenly spaced around the circumference, and the radii passing through the input and output edges of each the return vanes form an angle λ of 110 ° to 112 °.

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