RU2669124C1 - Centrifugal pump - Google Patents

Centrifugal pump Download PDF

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Publication number
RU2669124C1
RU2669124C1 RU2018101013A RU2018101013A RU2669124C1 RU 2669124 C1 RU2669124 C1 RU 2669124C1 RU 2018101013 A RU2018101013 A RU 2018101013A RU 2018101013 A RU2018101013 A RU 2018101013A RU 2669124 C1 RU2669124 C1 RU 2669124C1
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RU
Russia
Prior art keywords
straightening
inlet
forming
arc
longitudinal
Prior art date
Application number
RU2018101013A
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Russian (ru)
Inventor
Сергей Викторович Яблочко
Original Assignee
Сергей Викторович Яблочко
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Priority to RU2018101013A priority Critical patent/RU2669124C1/en
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Publication of RU2669124C1 publication Critical patent/RU2669124C1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/04Helico-centrifugal pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/42Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44Fluid-guiding means, e.g. diffusers
    • F04D29/445Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00Priming; Preventing vapour lock
    • F04D9/04Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
    • F04D9/043Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock the priming pump being hand operated or of the reciprocating type

Abstract

FIELD: motors and pumps.
SUBSTANCE: invention relates to pumping equipment. Centrifugal pump comprises a straightening device (SD) installed between the screw and impeller. SD is made with a profiled body, sleeve (S) and located between S and the inner surface of the body ten blades (B). SD body is made in the form of a confuser with an inlet groove and an outlet flange for connection, respectively, with a suction pipe and pump body. Generatrix of S outer surface in the longitudinal section consists of two straight lines interconnected by an arc of the circle with the formation of a convex outer surface with input and output conical sections. Straight lines of sections are inclined to SD longitudinal axis at different angles. Inner surface of SD body is formed from the entrance side by a cylindrical surface, smoothly conjugated to a conical surface, and tapered along the flow surface, smoothly conjugated to the output smoothly expanding along the flow surface. S length is less than SD body length. B along SD axis are smoothly bent in the inlet and middle parts from the side of their concave and convex parts along the arc of the circle along the flow of the medium with the direction of the flow at the inlet and outlet at acute angles to SD cross section. B input and output edges in B longitudinal section are formed by an arc of a circle. At the entrance area, each B gradually increases its thickness and at the output section smoothly tapers towards the output edge. S input section is located with a clearance inside SD from the output section of the bore. B entrance edge is inclined to the vertical in the longitudinal section inside the device, in the cross section it is made at an acute angle to the radius of SD body. Longitudinal stiffeners are made on the external surface of SD body, and SD is made in the form of a single piece.
EFFECT: as a result, it is possible to more effectively convert the kinetic energy of a swirling flow of a pumped fluid into increase in the pressure of the flow of the pumped liquid medium and simultaneously increase the anticavitation properties of a centrifugal pump.
1 cl, 4 dwg

Description

The invention relates to pumping technology, in particular to centrifugal pumps and can be used in those areas of technology where a stable supply of a pumped liquid medium or the use of centrifugal pumps with high anti-cavitation properties is required.
Known screw centrifugal pump containing a centrifugal impeller and installed in the suction pipe at the inlet of the centrifugal impeller (see book B.V. Ovsyannikov, Chebaevsky V.F. "High-speed vane pumps", M., Engineering, 1975, S. 12 , fig. 4).
However, this centrifugal pump does not fully ensure the required increase in pressure at the inlet of the centrifugal impeller, which is associated with hydraulic pressure losses when a highly swirling flow is fed to the inlet of the centrifugal impeller, which reduces the anti-cavitation properties of this centrifugal pump.
The closest to the invention in terms of technical nature and the technical result achieved is a centrifugal pump containing an impeller installed in the pump casing, a screw is installed on its shaft, and a straightening device is installed between the screw and impeller (see copyright certificate SU No. 268177, CL F04D 9/04, publ. 04/02/1970).
This centrifugal pump has more
High anti-cavitation properties. However, the implementation of the straightening apparatus in the form of blades made in the suction nozzle does not fully reduce hydraulic losses from swirling the flow of the pumped liquid medium at the inlet to the impeller of the centrifugal pump, which narrows the use of this centrifugal pump.
The technical problem solved in this invention is the elimination of the disadvantages identified in the known technical solutions.
The technical result achieved in this invention is that it is possible to more efficiently convert the kinetic energy of the swirling flow of the pumped liquid medium created by the screw into potential energy, namely, to increase the pressure of the stream of the pumped liquid medium, and at the same time direct the flow of the pumped liquid medium at the optimum angle of rotation at the inlet of the impeller of the centrifugal pump, which improves the anti-cavitation properties of the centrifugal pump.
This technical problem is solved, and the technical result is achieved due to the fact that the centrifugal pump contains an impeller installed in the pump casing, a screw is installed on its shaft, and a straightening device is installed between the screw and the impeller, the latter being made with a shaped body , the sleeve and ten blades located between the sleeve and the inner surface of the housing, the housing of the straightening apparatus is made in the form of a confuser with an inlet groove and an output flange for For connection, respectively, with the suction port of the pump and the pump casing, in longitudinal section the generatrix of the outer surface of the sleeve consists of two straight lines interconnected by an arc of a circle to form a convex outer surface with inlet and outlet conical sections, and the straight line of the inlet section is inclined to the longitudinal axis of the straightening apparatus at an angle α from 43 ° to 45 ° and the straight line of the output section is inclined in the longitudinal axis of the straightening apparatus at an angle β from 8 ° to 10 °, the inner surface b the body of the straightening apparatus is formed from the inlet side by a cylindrical surface smoothly conjugated with a conical, made with a cone inclination angle γ of 20 ° to 22 °, and tapering along the flow surface, smoothly conjugating with the output surface gradually expanding along the flow, length the bushings are less than the length of the rectifier apparatus body, and the blades along the axis of the rectifier apparatus are smoothly curved in the inlet and middle parts from the side of their concave and convex parts along circular arcs along the flow are redirected with the flow direction at the inlet at an acute angle δ and at the exit at an acute angle λ to the cross section of the rectifying apparatus, the inlet and outlet edges of the blades in the longitudinal section of the blade are formed by an arc of a circle, with each blade smoothly increasing its thickness at the exit section the section tapers smoothly towards the output edge, the input section of the sleeve is positioned with a clearance inward of the rectifying apparatus from the output section of the groove, the input edge of the blades is inclined to the vertical in the longitudinal section and a straightening apparatus inside the straightening apparatus at an angle ζ, comprising a vertical from 9 ° to 11 °, and in cross section made at an acute angle to the radius of the body of the straightening apparatus, longitudinal stiffeners are made on the outer surface of the body of the straightening apparatus, and the straightening apparatus is made in as a single part.
In the longitudinal section of the blade, the radius of the circular arc forming the outlet portion of the concave portion of the blade profile is equal to the radius of the circular arc forming the outlet portion of the convex portion of the blade profile, the radius of the circular arc forming the middle concave portion of the blade profile is greater than the radius of the circular arc forming the middle convex portion of the profile blades, an arc of a circle forming the input edge of the blade is paired with an arc of a circle forming a concave part of the blade, a straight line forming a straightening cross section about the apparatus, the angle λ is from 33 ° to 35 °, and is conjugated with an arc of a circle forming the convex part of the scapula, a straight line forming with the cross section of the straightening apparatus an angle μ from 31 ° to 33 °, and the arc of a circle forming the outlet edge of the scapula is paired with an arc of a circle forming the concave part of the scapula with the formation of an angle δ from 82 ° to 83 ° with a cross section of the straightening apparatus and is conjugated with an arc of a circle forming a convex part of the scapula with the formation of an angle θ from 78 ° to 79 ° with the cross section of the straightening apparatus.
In the course of the study, it was found that it is not enough just to influence the flow of the pumped liquid medium with the help of a screw and to convert part of the kinetic energy of the flow of the pumped liquid medium to pressure. It is required to reduce hydraulic losses as much as possible and bring the flow of the pumped liquid medium to the impeller with optimal speed characteristics and at the optimal minimum twist angle. This is achieved by installing smoothly curved in the longitudinal direction of the blades in the profiled annular channel described above, formed by the inner surface of the housing and the outer surface of the sleeve, and the required structural rigidity is achieved by performing longitudinal stiffeners on the outer surface of the housing.
In FIG. 1 shows a longitudinal section of a centrifugal pump,
In FIG. 2 is a longitudinal section through a centrifugal pump straightening apparatus.
In FIG. 3 is a view A of FIG. 2
In FIG. 4 is a longitudinal section through a blade of a straightening apparatus.
The centrifugal pump contains an impeller 2 installed in the pump housing 1, on the shaft 3 of which a screw 5 is installed in the suction pipe 4, and a straightening device 6 is installed between the screw 5 and the impeller 2.
The straightening apparatus 6 is made with a profiled body 7, a sleeve 8 and ten blades 9 located between the sleeve 8 and the inner surface of the housing 7.
The housing 7 of the straightening apparatus 6 is made in the form of a confuser with an inlet groove 10 and an outlet flange 11 for connection, respectively, with the suction pipe 4 of the pump and the housing 1 of the pump.
In a longitudinal section, the generatrix of the outer surface of the sleeve 8 consists of two straight lines interconnected by an arc of a circle to form a convex outer surface with inlet and outlet conical sections, and the straight line of the inlet section is inclined to the longitudinal axis 12 of the straightening apparatus 6 at an angle α from 43 ° to 45 ° and the straight line of the output section is inclined in the longitudinal axis 12 of the rectifier 6 at an angle β from 8 ° to 10 °
The inner surface of the housing 7 of the straightening apparatus 6 is formed from the inlet side by a cylindrical surface smoothly conjugated to a conical, made with a cone angle γ of 20 ° to 22 °, and tapering along the flow surface, smoothly conjugating with the output gradually expanding along the flow surface. The length of the sleeve 8 is less than the length of the housing 7 of the straightening apparatus 6, and the blades 9 along the axis of the straightening apparatus 6 are smoothly curved in the inlet and middle parts from the side of their concave and convex parts along circular arcs along the medium flow with the flow direction at the inlet at an acute angle δ and at the exit at an acute angle λ, to the cross section of the rectifying apparatus 6, the inlet 14 and outlet 15 of the blade edge 9 in the longitudinal section of the blade are formed by an arc of a circle.
At the inlet section, each blade 9 gradually increases its thickness and at the outlet section tapers smoothly towards the outlet edge 15. The inlet section of the sleeve 8 is located with a clearance inside the rectifier 6 from the outlet section of the groove 10. The inlet edge 14 of the vanes 9 is inclined to the vertical in the longitudinal the cross section of the straightening apparatus 6 inside the straightening apparatus 6 at an angle ζ, comprising a vertical from 9 ° to 11 °, and in cross section made at an acute angle to the radius of the housing 7 of the straightening apparatus 6, on the outer surface ti housing 7 straightening machine 6 are longitudinal ribs 13 and straightening means 6 is formed as a single piece.
In the longitudinal section of the blade 9, the radius R1 of the circular arc forming the outlet portion of the concave portion of the blade profile 9 is equal to the radius R2 of the circular arc forming the outlet portion of the convex portion of the blade profile 9, the radius R3 of the circular arc forming the middle concave portion of the blade profile 9 is greater than the radius R2 circular arcs forming the middle convex part of the profile of the blade 9, the circular arc forming the input edge 15 of the blade 9 is conjugated with the circular arc forming the concave part of the blade 9 with a straight line forming with a cross section m of the straightening apparatus 6, the angle λ is from 33 ° to 35 °, and is conjugated with an arc of a circle forming the convex part of the blade 9, a straight line forming an angle μ from 31 ° to 33 ° with the cross section of the straightening apparatus, and a circular arc forming the exit edge 14 of the blade 9, is conjugated with an arc of a circle R1, forming a concave part of the blade with the formation of a straightening apparatus 6 (tangent to the mating point) with an angle δ from 82 ° to 83 °, and is conjugated with an arc of a circle R2, forming a convex part of the blade with the formation with cross section m straightening machine (tangent to the place of conjugation) angle θ from 78 ° to 79 °.
Centrifugal pump operates as follows.
The flow of the liquid pumped medium enters first into the rotating screw 5, in which mechanical energy is transmitted to the liquid medium. The fluid flow of the fluid pumped by the screw 5 from the screw 5 enters the straightening apparatus 6, where due to the inhibition of the flow of the fluid fluid on the blades 9, the flow rate of the fluid fluid is reduced and its pressure increases. From the rectifying apparatus 6, the flow of the pumped liquid medium is directed to the impeller 2 at a predetermined optimal twist angle, where the liquid medium is further accelerated and from the impeller 2 enters the guide apparatus 1, where the accelerated flow of the liquid working medium is inhibited with increasing pressure of the pumped medium flow. From a centrifugal pump, a stream of liquid pumped medium at a given pressure is supplied to the consumer.
The profiled flow part of the straightening apparatus 6 allows to reduce hydraulic losses, and the remaining hydraulic energy losses are more likely to be friction energy losses along the flow part of the straightening apparatus 6.

Claims (2)

1. A centrifugal pump containing an impeller installed in the pump housing, a screw is installed on its shaft in the suction pipe, and a straightening device is installed between the screw and the impeller, characterized in that the straightening device is made with a profiled housing, a sleeve and located between the sleeve and the inner the surface of the housing with ten blades, the housing of the straightening apparatus is made in the form of a confuser with an inlet groove and an outlet flange for connecting, respectively, with the suction pipe of the pump and by a pumping unit, in longitudinal section forming the outer surface of the sleeve consists of two straight lines, interconnected by an arc of a circle to form a convex outer surface with inlet and outlet conical sections, and the straight line of the inlet section is inclined to the longitudinal axis of the straightening apparatus at an angle α from 43 ° to 45 ° and the straight line of the exit section is inclined in the longitudinal axis of the rectifier at an angle β from 8 ° to 10 °, the inner surface of the housing of the straightener is formed from the side of the cylinder a smooth surface conjugated with a conical one, made with a cone inclination angle γ of 20 ° to 22 °, and tapering along the flow surface, smoothly conjugating with the output surface gradually expanding along the flow, the sleeve length is less than the length of the straightening apparatus body, and the blades along the axis of the rectifier are smoothly curved in the inlet and middle parts from the side of their concave and convex parts along circular arcs along the medium flow with the flow direction at the inlet at an acute angle λ and at the exit At an acute angle δ to the cross section of the rectifying apparatus, the inlet and outlet edges of the blades in the longitudinal section of the blade are formed by an arc of a circle, while at the inlet section each blade smoothly increases its thickness and at the outlet section smoothly tapers towards the output edge, the inlet section of the sleeve is located with a clearance inward of the rectifying apparatus from the outlet cross section of the groove, the input edge of the blades is inclined to the vertical in the longitudinal section of the rectifying apparatus inside the rectifying apparatus at an angle Integral with the vertical of 9 ° to 11 °, and in cross section is formed at an acute angle to the radius of the body straightening apparatus for straightening the outer surface of the housing unit formed longitudinal ribs and straightening unit is configured as a single piece.
2. The centrifugal pump according to claim 1, characterized in that in the longitudinal section of the blade, the radius of the circular arc forming the outlet portion of the concave portion of the blade profile is equal to the radius of the circular arc forming the outlet portion of the convex portion of the blade profile, the radius of the circle arc forming the middle concave portion the profile of the scapula, greater than the radius of the arc of a circle forming the middle convex part of the profile of the scapula, the circular arc forming the inlet edge of the scapula is conjugated with the circular arc forming the concave part of the scapula, a straight line forming an angle λ from 33 ° to 35 ° with the cross section of the straightening apparatus and is conjugated with an arc of a circle forming the convex part of the scapula, a straight line forming an angle μ from 31 ° to 33 ° with the cross section of the straightening apparatus, and the circular arc, forming the outlet edge of the scapula, is conjugated with an arc of a circle forming a concave part of the scapula, with the formation of an angle δ from 82 ° to 83 ° with a cross section of the straightening apparatus and is conjugated with an arc of a circle forming a convex part of the scapula, with the formation of a straight section with a cross section The bending apparatus of the angle θ from 78 ° to 79 °.
RU2018101013A 2018-01-12 2018-01-12 Centrifugal pump RU2669124C1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU268177A1 (en) * О. В. Байбаков , В. И. Мелащенко Centrifugal pump
RU2472039C1 (en) * 2011-11-21 2013-01-10 Закрытое Акционерное Общество Научно-Производственное Объединение "Тэн" Structural row of vertical electrically driven oil pumps
US8506236B2 (en) * 2009-08-03 2013-08-13 Ebara International Corporation Counter rotation inducer housing
US8550771B2 (en) * 2009-08-03 2013-10-08 Ebara International Corporation Inducer for centrifugal pump
RU165042U1 (en) * 2015-12-25 2016-09-27 Открытое акционерное общество "Акционерная компания по транспорту нефти "Транснефть" (ОАО "АК "Транснефть") Vertical screw centrifugal pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU268177A1 (en) * О. В. Байбаков , В. И. Мелащенко Centrifugal pump
US8506236B2 (en) * 2009-08-03 2013-08-13 Ebara International Corporation Counter rotation inducer housing
US8550771B2 (en) * 2009-08-03 2013-10-08 Ebara International Corporation Inducer for centrifugal pump
RU2472039C1 (en) * 2011-11-21 2013-01-10 Закрытое Акционерное Общество Научно-Производственное Объединение "Тэн" Structural row of vertical electrically driven oil pumps
RU165042U1 (en) * 2015-12-25 2016-09-27 Открытое акционерное общество "Акционерная компания по транспорту нефти "Транснефть" (ОАО "АК "Транснефть") Vertical screw centrifugal pump

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