CN2198420Y

CN2198420Y - Double casing centrifugal pump

Info

Publication number: CN2198420Y
Application number: CN 94228917
Authority: CN
Inventors: 吴恩沛
Original assignee: FANGTIAN WATER PUMP PRODUCTION Co Ltd SHENYANG
Current assignee: FANGTIAN WATER PUMP PRODUCTION Co Ltd SHENYANG
Priority date: 1994-06-17
Filing date: 1994-06-17
Publication date: 1995-05-24
Anticipated expiration: 2004-06-17

Abstract

The utility model relates to a double casing centrifugal pump, which comprises a pump cover, a supporting seat, an exhausted flange, a guide blade, an impeller which is arranged on a pump shaft, the lining of the guide blade, a balancing piston, a shaft sleeve, etc. The utility model is characterized in that the fluid conveying and overflowing mechanism of the pump adopts a double casing, three-stage impeller, and three-stage guide blade cantilever type structure. An elastic washer is arranged between the final stage guide blade casing and the pump cover. The power input position of the pump shaft is provided with a dual shaft middle fraction speed increasing mechanism. The utility model has the advantages of high voltage and high temperature resistance, corrosion resistance, leak prevention, big range of use, high efficiency, reliable performance, and convenient maintenance and keep.

Description

Double casing centrifugal pump

The utility model relates to fluid machinery, specifically a kind of double casing volute pump.

Centrifugal pump is to be widely used in the machine that liquid is carried in the industrial production, particularly produces in the complicated technological process in petrochemical industry, carries liquid charging stock, semi-finished product, finished product and more extensive that aspect such as chemical reaction pressure flow uses is provided.At present, the small flow that uses during petrochemical industry is produced, high-lift centrifugal pump and overcurrent mechanism all are mono-hull one-level cantilever or two-stage cantilever structure.Fig. 1 is a mono-hull two-stage cantilever structure schematic representation.It mainly is made up of pump housing shell 1, impeller 2, stator 3, pump shaft 4, axle sleeve 5, sealing 6, pump cover 7 and transmission and supporting portion.What the single-stage cantilever structure was different with it is one-level impeller, no stator, and there is speed increasing mechanism pump shaft power input part.They all are by dwindling area of passage, or increase impeller progression, or improve rotating speed, reduce flow, improve lift.But requiring efficient height, flow less than 6m ³/ h, lift do not reach the production usage requirement during greater than 100m, and its reason is to exist following deficiency:

1, under the operating conditions of carrying petrochemical industry liquid such as inflammable, explosive, high pressure, high temperature, corrosion be strong, pump case and overcurrent mechanism are withstand voltage, corrosion protection, and performances such as anti-leak are reliable and stable inadequately, and efficient is low, and lift is not enough.

2, the speedup of single-stage cantilever structure part as shown in Figure 2, speedup box is the sealing cartridge type, be connected on the motor housing, motor shaft end connects overdrive gear, is in cantilever position work, and transmission is steady inadequately, noise is big, radial alignment and gear engagement precision are undesirable, and maintenance needs the dismounting casing, take a lot of work, time-consuming.

3, design is worked as flow less than 6m routinely ³/ h, when lift was higher than 100mm, the impeller casting technique did not pass a test, and foundry goods is difficult to casting.

The purpose of this utility model is at above-mentioned deficiency, provides that a kind of using scope is big, efficient is high, reliable performance, the double casing volute pump being convenient to maintain.

To achieve these goals, art designs core of the present utility model is to adopt double Shell, the axial elasticity liner is set, increase impeller and stator progression, improve speed increasing mechanism, optimize rotating speed, every technical performance parameters such as pressure, flow, overflow section, lift improve reliability, stability, applicability that pump is worked under various conditions.Double casing volute pump, it is by pump cover, supporting base, discharge flange, stator, balance set, seals and be assemblied in impeller on the pump shaft, stator lining, balancing drum, axle sleeve etc. and constitute, and it is characterized in that the transfusion overcurrent mechanism of pump has adopted bivalve body, three grades of impellers and three grades of stator cantilever structures; Between final stage stator housing and pump cover, installed elastic insert; Power input position at pump shaft is provided with twin shaft midsplit type speed increasing mechanism.

The utility model is owing to adopted above-mentioned measure, and advantage is:

1, the bivalve body has improved combination properties such as pump case is high pressure resistant, high temperature, anti-leak, and inner housing is a high-strength corrosion-resisting spare, has reduced the corrosion of transfusion centering frame, has prolonged the working life of frame.

2, adopt elastic insert, overcome the pressure and the thermal stress that are produced in the pump when carrying high-temp liquid, compensated the differential expansion of pump inner piece, three grades of impellers and speed increasing mechanism have improved lift.

3, owing to adopted speedup, three grades of cantilever structures have reduced impeller outer diameter, and the foundry goods difficulty is reduced.

Fig. 1 is a mono-hull two-stage cantilever type centrifugal pump structure schematic representation.

Fig. 2 is an one-level cantilever type centrifugal pump speed increasing mechanism schematic representation.

Fig. 3 is the utility model example structure schematic representation.

Fig. 4 is the structural representation at overcurrent mechanism position among Fig. 3.

Fig. 5 is the structural representation at speed increasing mechanism position among Fig. 3.

Further specify below in conjunction with Fig. 3-5: discharge flange 17, supporting base 21 all are connected with the frame 1 of pump.Frame 1 is a single piece, inner housing 19 comprises back segment 19a, stage casing 19b, adopt seam location centering between two sections, join with positioning spigot 27 assemblings, form sectional type inner housing 19, inner housing 19 is assemblied in and constitutes the bivalve body in the frame 1, the three grade impellers 2 of device on pump shaft 4 cantilever segments, all be positioned within the inner housing 19 with three grades of stators 3 and stator lining 26, constitute transfusion overcurrent mechanism with sectional type inner housing 19.Pump cover 7 one ends are connected with frame 1, flexible liner 15 between pump cover 7 and final stage stator 16.Elastic insert 15 is arranged on the liner retaining platform 22 of pump cover 7 and within the liner concave station 23 of final stage stator 16, said elastic insert 15 can be a belleville spring.The other end of pump cover 7 links to each other with twin shaft speedup machinery.The twin shaft speed increasing mechanism comprises the power intake of speedup box 8, speedup axle 12, overdrive gear 10, bearing 11, pump gear 9 and pump shaft 4, overdrive gear 10 is connected on the speedup axle 12, be meshed with pump gear 9, bearing 11 is equipped with at the supporting position of pump shaft 4 and speedup axle 12, bearing 11 is connected on the speedup box 8, and speedup box 8 is horizontal midsplit type structure.Be connected with balancing drum 13 on the pump shaft, sealing 6 is housed between axle sleeve 5 and the pump cover 7, balancing drum 13 links to each other with balance set 14, and balance set 14 is connected on the pump cover 7.

Working procedure: Pump Suction Nozzle 20 joins with suction pipe, and exhaust port 18 joins with discharge tube.Drive the work of twin shaft speed increasing mechanism behind the electric motor starting, three grades of impeller 2 synchronous high-speeds that make pump shaft 4 and be assemblied on the axle rotate, liquid because of the impeller high speed rotating by suction pipe through suction port 20, enter the impeller channel 25 of first order impeller 2, because of producing centrifugal force with the rotation of impeller synchronous high-speed, and acquisition energy and speed throw away in impeller channel 25, be introduced into by first order stator 3, the gate vane channel 24 that stator lining 26 and stage casing 19b constitute, liquid with energy and speed gate vane channel 24 of flowing through, instantaneous promptly by second level impeller 2 by in the suction port 20 inspiration second level impeller channels 25, be synchronized with second level impeller high speed rotating, in second level impeller channel 25, throw away, be introduced into by second level stator 3 with higher energy and speed, stator lining 26, the second level gate vane channel 24 that back segment 19a constitutes.Last with same flow process through third level impeller channel 25, gate vane channel 24, is discharged flange 17 and is entered discharge tube by exhaust port 18 with due flow and lift.Three grades of impellers 2 are even and continuously high speed rotating, and the liquid that export is also sucked and discharges by overcurrent mechanism continuously.Because heat in pump works long hours and produces, or carry composite factors such as energy that heat that high-temp liquid brings and liquid at high speed rotation produce and speed, make to produce in the transfusion in the pump and press and thermal stress.Pressure by transfusion compresses sectional type inner housing 19 and frame 1, infusion pressure also acts on stage casing 19b and frame 1 simultaneously, the elastic force of the belleville spring between back segment 19a and stage casing 19b, final stage stator 16 and the pump cover 7, and infusion pressure interacts between three sections, makes that junction surface has enough impacting forces and sealing between each section.Be assemblied in the axial force of three grades of impellers 2 on the pump shaft 4, come balance, guaranteed that pump shaft 3 is stressed even, improved working life by balancing drum 13 and balance set 14.Between pump cover 7 and pump shaft 4, adopt axle sleeve 5 and sealing 6 sealings that match, guaranteed and improved the sealability of pump.Sealing also is provided with flushing and cooling system.In every grade of impeller 2 impeller channel 25 is arranged all, in every grade of stator 3 gate vane channel 24 is arranged all, and all constitute with sectional type inner housing 19.

Claims

1, a kind of double casing volute pump, it is by pump cover, supporting base, discharge flange, stator, balance set, seals and be assemblied in impeller on the pump shaft, stator lining, balancing drum, axle sleeve etc. and constitute, and it is characterized in that the transfusion overcurrent mechanism of pump has adopted bivalve body, three grades of impellers and three grades of stator cantilever structures; Between final stage stator housing and pump cover, installed elastic insert; Power input position at pump shaft is provided with twin shaft midsplit type speed increasing mechanism.

2, double casing volute pump according to claim 1, it is characterized in that frame is whole, inner housing comprises back segment, stage casing, adopts seam location centering between two sections, joins with the positioning spigot assembling, form the sectional type inner housing, inner housing is assemblied in and constitutes the bivalve body in the frame, and the three grade impellers of device on the pump shaft cantilever are with three grades of stators and stator lining, all place within the inner housing, constitute transfusion overcurrent mechanism with the sectional type housing.

3, double casing volute pump according to claim 1 is characterized in that elastic insert is arranged on the liner retaining platform of pump cover and within the liner concave station of final stage stator, said elastic insert can be a belleville spring.

4, double casing volute pump according to claim 1, it is characterized in that twin shaft midsplit type speed increasing mechanism comprises the power intake of speedup box, speedup axle, overdrive gear, bearing, pump gear and pump shaft, overdrive gear is connected on the speedup axle, be meshed with pump gear, bearing is equipped with at the supporting position of pump shaft and speedup axle, bearing is connected on the speedup box, and speedup box is horizontal midsplit type structure.