CN200989330Y

CN200989330Y - Segmental symmetrical scroll guide ring multistage centrigfugal pump

Info

Publication number: CN200989330Y
Application number: CN 200620112070
Authority: CN
Inventors: 王天周; 陈晴; 赵自成; 于湘智; 彭学龙
Original assignee: Chongqing Pump Industry Co Ltd
Current assignee: Chongqing Pump Industry Co Ltd
Priority date: 2006-12-26
Filing date: 2006-12-26
Publication date: 2007-12-12
Anticipated expiration: 2016-12-26

Abstract

The utility model discloses a symmetrical-section scrolled-case guiding-ring multistage centrifugal pump consisting of a centrifugal pump body, a rear bearing component, a bracket, a high-pressure water inlet, a rear flow-guided body, a shaft, a rear impeller, a rear guiding ring, a water outlet section, a front guiding ring, a front fluid-guided body, a front impeller, a water inlet section and a front bearing body positioned in centrifugal pump. The water outlet section is symmetrically provided with a internal water outlet channel and a front internal water channel, and symmetrically provided with a front fluid-guided scrolled case and a rear fluid-guided scrolled case. The front fluid-guided scrolled-case inside is provided with the front guiding ring. The rear fluid-guided scrolled-case is provided with the rear guiding ring. The front guiding ring is communicated with the front internal water channel. The rear guiding ring is communicated with the rear internal water outlet channel. The multistage centrifugal pump absorbs the advantages of the scrolled case water-pressurized chamber in the sectional multistage pump, enables the fluid to flow along one direction in the water-pressurized chamber, avoids the mixed loss and enhances the centrifugal pump efficiency; The impeller outlet fluid flow is smoothly guided into the spiral water-pressurized chamber and enabled to flow along one direction; the guiding ring is arranged and the same scrolled case can be arranged with impellers of different diameters without the pump efficiency lowered.

Description

Sections symmetry volute guide ring multistage centrifugal pump

Technical field

The utility model relates to a kind of multistage centrifugal pump, especially adopts the sections symmetry volute guide ring multistage centrifugal pump of volute shape pumping chamber and guide ring structure.

Background technique

In the centrifugal pump field, high pressure centrifugal pump is multistage, and multistage centrifugal pump has axial subdivision and two kinds of forms of subdivision radially.Axial subdivision all manufactures up and down two housings, all adopts volute shape pumping chamber, can't segmentation, when the lift of pump parameter need strengthen, can only adopt the redesign housing, thereby make the cost of production of pump big, sales difficulty, and the ability that the adaptation customer parameter changes is subjected to very big restriction; The multistage centrifugal pump of subdivision radially, be the sectional type multistage centrifugal pump of China, such pump all adopts stator formula and annular pumping chamber, though it can require to change pump impeller and housing quantity according to user's lift, but can't meet the demands with variation impeller, housing quantity at pump, and when adopting the cutting impeller method, the efficient of pump will have decline by a relatively large margin, energy consumption rises, simultaneously, centrifugal pump adopts the efficient of stator and annular pumping chamber all low by 2%～4% than volute shape pumping chamber, and especially for low specific-speed centrifugal pump, its efficient hangs down 3%～6% especially.

In the multistage centrifugal pump of pumping chamber that goes in ring, the water that flows out in the impeller has certain flow angle, and the pumping chamber that goes in ring does not have flow guide device when collecting impeller outlet liquid, the high velocity liquid stream of impeller outlet flows out from each runner and enters pumping chamber, produce serious mutual bump and off-energy, impeller outlet liquid stream is before entering annular pumping chamber, form an angle with the ring cavity tangent line, after entering annular chamber, because the trend of oriented direction motion, and liquid flows to the trend that has when pump discharge flows out with the beeline outflow, therefore, liquid energy not only has serious bump loss in the annular pumping chamber, and serious losses by mixture is arranged, and makes annular pumping chamber lower than volute pumping chamber efficient.

Summary of the invention

The utility model provides a kind of advantage with radially split pump and axial subdivision pump organically to combine at the above-mentioned deficiency of prior art, the sections symmetry volute guide ring multistage centrifugal pump that efficient is higher.

The technical solution of the utility model: sections symmetry volute guide ring multistage centrifugal pump, comprise centrifugal pump body, the rear bearing parts that are provided with in the centrifugal pump body, carriage, the high pressure feed-water end, back deflector, axle, back impeller, back guide ring, water exit end, preceding guide ring, preceding deflector, preceding impeller, inlet segment, the fore bearing body, symmetrically arranged water outlet and preceding aqueduct on water exit end, it is characterized in that: preceding water conservancy diversion volute and back water conservancy diversion volute that symmetry is set on water exit end, in preceding water conservancy diversion volute, preceding guide ring is set, the back guide ring is set in the water conservancy diversion volute of back, preceding guide ring is communicated with the water delivery runner, and back guide ring is communicated with outlet passage.

Further feature is: preceding volute circulation road and volute circulation road, back opening degree are along with the increase of guide ring radial dimension increases gradually, and axial width final and volute is complementary.

Sections symmetry volute guide ring multistage centrifugal pump of the present utility model has following characteristics:

1, in the sections multistage centrifugal pump, absorbed the advantage of volute pumping chamber, liquid stream is flowed to a direction in pumping chamber, avoided losses by mixture, improved centrifugal pump efficient.

2, the blade angle of guide ring is also consistent with the impeller outlet flow angle, the guide ring vane tip is made thin as far as possible, impeller outlet liquid stream is imported in the volute pumping chamber smoothly, and it is mobile to make liquid flow to a direction, has avoided the bump loss of pumping chamber to close and losses by mixture.

3, install guide ring additional, the base circle diameter (BCD) of volute shape pumping chamber is changed with impeller diameter; Can on same volute, assemble the impeller of different-diameter and the efficient of pump can not descended.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described

Fig. 1 is the utility model structure sectional view;

Fig. 2 is water exit end (part a 9) structure sectional view;

Fig. 3 is the left view of Fig. 2;

Fig. 4 is preceding guide ring (part a 10) structural front view.

Embodiment

In Fig. 1,1-centrifugal pump body, 2-rear bearing parts, 3-carriage, 4-high pressure feed-water end, deflector behind the 5-, 6-axle, impeller behind the 7-, guide ring behind the 8-, 9-water exit end, impeller before the deflector before the guide ring before the 10-, 11-, 12-, the 13-inlet segment, 14-fore bearing body, 16-water outlet, volute before the aqueduct before the 17-, 19-, volute behind the 20-;

Sections multistage centrifugal pump of the prior art, comprise centrifugal pump body 1, be provided with rear bearing parts 2, carriage 3, high pressure feed-water end 4, back deflector 5, axle 6, back impeller 7, back guide ring 8, water exit end 9, preceding deflector 11, preceding impeller 12, inlet segment 13, fore bearing body 14 etc. in the centrifugal pump body 1, on water exit end 9, be symmetrically arranged with water outlet 16 and preceding aqueduct 17, water outlet 16 is as the pipeline of high-pressure liquid outflow centrifugal pump body 1, and preceding aqueduct 17 arrives the impeller of multistage centrifugal pump rear end as the FLUID TRANSPORTATION through the front end pressurization; Fluid enters in the centrifugal pump body 1 from inlet segment 13, the effect of deflector 11, preceding impeller 12 before axle 6, front end a plurality of, and pressurization is after preceding aqueduct 17 enters into centrifugal pump body 1 rear end; In centrifugal pump body 1 rear end, the effect of deflector 5, back impeller 7 behind axle 6, rear end a plurality of, centrifugal pump bodies 1 are flowed out from the water outlet 16 of water exit end 9 in the pressurization back.As prior art, the known part of sections multistage centrifugal pump is no longer described in detail.

Improvement of the present utility model, be preceding volute 19 and the back volute 20 that symmetry is set on water exit end 9, guide ring 10 before in preceding volute 19, being provided with, back guide ring 8 is set in the volute 20 of back, preceding guide rings 10 in the preceding volute 19 are communicated with preceding aqueduct 17, make fluid elder generation after the front end pressurization in the aqueduct 17, enter into centrifugal pump body 1 rear end again before entering through preceding guide ring 10; Back guide rings 8 in the back volute 20 are communicated with water outlet 16, make fluid after pressurizeing in the rear end again, through after guide ring 8 enter in the water outlet 16, discharge centrifugal pump body 1 at last.

In Fig. 2,3,25-volute circulation road;

Water exit end 9 is volute pumping chamber structures, it is a solid of rotation, the water outlet 16 and the preceding aqueduct 17 that wherein are arranged on the outer end are symmetrically distributed, the preceding volute 19 and the back volute 20 that are arranged on the intermediate portion are symmetrically distributed, preceding guide ring 10 before being arranged in the volute 19 back guide ring 8 structures interior with being arranged on back volute 20 are identical, and physical dimension is identical or basic identical; Outer end at preceding volute 19 and back volute 20 is provided with volute circulation road 25, and the opening degree in volute circulation road 25 increases gradually, and axial width final and volute is complementary; With

water outlet

16 or 17 remittances place mutually of preceding aqueduct, the opening degree maximum is with the equal diameters of water outlet 16 or preceding aqueduct 17 or equate substantially.The opening degree in volute circulation road 25 preferably increases according to the involute formula; The fluid that can effectively avoid like this flowing out in the past guide ring 10 or the back guide ring 8 collides off-energy mutually in volute circulation road 25.Impeller for different-diameter, the diameter of guide ring 10 and back guide ring 8 before only needing to change, guide ring 10 and back guide ring 8 before promptly only needing to change, the guide ring 10 and the base circle diameter (BCD) of back guide ring 8 and the diameter of forward and backward impeller are complementary before making, and make the housing of same set of centrifugal pump just can adapt to the impeller of multiple diameter.

In Fig. 4, the 28-guide vane; The 29-tapered runner;

On preceding guide ring 10 and back guide ring 8, be provided with plural a plurality of guide vane 28, directs high pressure fluids enters the flow direction in volute circulation road 25.A plurality of guide vanes 28 are symmetrically distributed at circumferencial direction.The fluid course of preceding guide ring 10 and back guide ring 8 is tapered runners 29, is up-small and down-big taper.During installation, make the laying angle of guide vane 28 consistent with the impeller outlet flow angle, the tip of guide vane 28 is made thin as far as possible, impeller outlet liquid stream is imported in the volute circulation road 25 smoothly, and make liquid stream flow to a direction and flow, avoided bump loss and losses by mixture in volute circulation road 25.

Claims

1, sections symmetry volute guide ring multistage centrifugal pump, comprise centrifugal pump body (1), the rear bearing parts (2) that are provided with in the centrifugal pump body (1), carriage (3), high pressure feed-water end (4), back deflector (5), axle (6), back impeller (7), water exit end (9), preceding deflector (11), preceding impeller (12), inlet segment (13), fore bearing body (14), go up symmetrically arranged water outlet (16) and preceding aqueduct (17) at water exit end (9), it is characterized in that: preceding volute (19) and back volute (20) that symmetry is set on water exit end (9), preceding guide ring (10) is set in preceding volute (19), back guide ring (8) is set in back volute (20), preceding guide ring (10) is communicated with preceding aqueduct (17), and back guide ring (8) is communicated with water outlet (16).

2, sections symmetry volute guide ring multistage centrifugal pump according to claim 1, it is characterized in that: in the outer end of preceding volute (19) and back volute (20), be provided with volute circulation road (25), the opening degree in volute circulation road (25) increases gradually, and the axial width of preceding volute (19) and back volute (20) is complementary.

3, sections symmetry volute guide ring multistage centrifugal pump according to claim 1 and 2 is characterized in that: on preceding guide ring (10) and back guide ring (8), be provided with plural guide vane (28); The fluid course of preceding guide ring (10) and back guide ring (8) is tapered runner (29).

4, sections symmetry volute guide ring multistage centrifugal pump according to claim 2, it is characterized in that: the opening degree in volute circulation road (25) increases according to the involute formula; With water outlet (16) or preceding aqueduct (17) remittance place mutually, opening degree increases to the equal diameters of water outlet (16) or preceding aqueduct (17) or equates substantially.

5, sections symmetry volute guide ring multistage centrifugal pump according to claim 3, it is characterized in that: plural guide vane (28) is symmetrically distributed at circumferencial direction.