CN2304770Y

CN2304770Y - Double casing and multi-stage eccentric pump for light hydrocarbons

Info

Publication number: CN2304770Y
Application number: CN 97212193
Authority: CN
Inventors: 汪永和
Original assignee: SHENYANG CHEMICAL PUMP MANUFACTURING FACTORY
Current assignee: SHENYANG CHEMICAL PUMP MANUFACTURING FACTORY
Priority date: 1997-03-15
Filing date: 1997-03-15
Publication date: 1999-01-20
Anticipated expiration: 2007-03-15

Abstract

The utility model discloses a double casing and multi-stage eccentric pump for light hydrocarbons, which is composed of a suction inlet, a discharge outlet, a pump shaft and a waterpower part, wherein, the outer layer of the waterpower part is provided with two layers of casings, and an inner casing is composed of a pump rotor, a guide vane, an intermediate section and a suction body. The utility model can withdrawn and loaded the inner casing assembly without moving a pipe passage in maintenance time. The utility model has the advantages of time saving, labor saving, high efficiency, high sealing performance, and high reliability. The double casing and multi-stage eccentric pump for light hydrocarbons is widely suitable for petroleum refining and petrochemical industry.

Description

Two shell type multistage centrifugal light hydrocarbon pumps

The utility model relates to a kind of centrifugal pump, especially a kind ofly is used for the multistage centrifugal light hydrocarbon pump that dismounting maintenance is convenient in petrochemical industry.

At present, in petroleum refinement and petrochemical industry, general y type or the Ay type light hydrocarbon pump that adopts, this kind pump housing is a mono-hull, and there is non-characteristic hump in poor sealing performance in various degree for small flow high-pressure multi-stage centrifugal pump, make the pump vibration, cause limitation to use and maybe can not use.Need tear open greatly when also having the pump maintenance simultaneously, very inconvenient, waste time and energy.

The utility model purpose is to provide a kind of and has high efficiency, high leak tightness, high reliability, is convenient to two shell type multistage centrifugal light hydrocarbon pumps of dismounting maintenance.

The utility model is made up of suction port, discharge opening, pump shaft, hydraulic part, it is characterized in that the hydraulic part skin is equipped with two-layer housing, suction port and discharge opening are arranged on the frame, inner housing is adorned the assembly that forms a whole by pump rotor, stator, stage casing, suction body collection, and pump rotor is made up of pump shaft, first stage impeller, impeller, balance body, axle sleeve and locking member; First stage impeller passes pump shaft, pack into successively then stator, stage casing, impeller, and pump shaft passes the balance body at the impeller place, and the two ends of the first and last level impeller suction body of packing into passes through bolt between inner housing and the frame.Said balance body, frame, stage casing are through forging processing and fabricating.Working principle of the present utility model is like this: whole device is the bivalve body, and inner housing is assembled into one by pump rotor, stator, stage casing, suction body, the frame and extracting out in frame of can packing into easily.The pump rotor of inner housing is made up of pump shaft, impeller, Balance disc, axle sleeve, locking member collection dress, axial force during pump work is mainly born by balanced controls, residual axial force is born by the thrust bearing of anti-drive end, pump shaft supporting pump rotor, bearing is rolling bearing or sliding bearing, axle envelope adopts soft packing or mechanical seal, for carrying lighter hydrocarbons, pump inflammable and explosive, toxic liquid to select bellows mechanical seal for use, mechanical seal have from rinse-system and outside the flushing system.Every kind of physical dimension can change the outfit 2 kinds of impellers, 3 kinds of stators, derive 72 kinds of hydraulic performances, have high versatility.Performance range of the present utility model is as follows:

Flow O=1～200m ³/ h

Lift H=125～1000m

Rotation speed n=2950r/min

Serviceability temperature T=-20 ℃～+ 400 ℃

The utility model is applicable to petroleum refinement, petrochemical industry and chemical industry, carry the oil do not contain solid particle, lighter hydrocarbons, high temperature highly pressurised liquid such as inflammable and explosive, poisonous, it has fundamentally solved small flow high-pressure multi-stage centrifugal pump and has had non-characteristic hump problem, reduced NPSH, operate steadily simultaneously, increased reliability.The double-shell structure of this device makes pump have high leak tightness, high reliability, high efficiency, and after tested, efficient improves 3～5%, and when maintenance, the inner housing assembly can be extracted out under not mobile pipeline situation and pack into, and is time saving and energy saving.

Accompanying drawing 1 the utility model structural representation.

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

Suction port 8 and discharge opening 4 are arranged on the frame 6, and an end of pump is equipped with drive end bearing 10, and the other end is thrust bearing 1 and non-driven-end bearing 2.Inner housing is assembled into an integral body by pump rotor, stator 5, stage casing 7, suction body 3, and pump rotor wherein is assembled into by pump shaft 9, first stage impeller 11, impeller 12, balance body 13, axle sleeve and locking member, and impeller ring 14 is housed on the impeller 12.First stage impeller 11 passes pump shaft 9, and the stator 5 of packing into successively then, stage casing 7, impeller 12 pass balance body 13 at impeller place pump shaft 9, and the two ends of the first and last level impeller suction body 3 of packing into passes through bolt between inner housing and the frame.Pump shaft wherein adopts stiff shaft, and the sealing surface length of inter-stage axle sleeve and impeller ring has long enough, makes pump rotor have enough waterpower rigidity.Select the low-specific-speed hydraulic model during use for use, efficient can be improved 3～5%.Through test, pump rotor wet criticality rotating speed of the present utility model (i.e. critical speed of rotation in liquid) is higher than more than 1.5 times of revolution speed, and the few pump of group number is had dried commentaries on classics ability.

Claims

1. two shell type multistage centrifugal light hydrocarbon pump, form by suction port, discharge opening, pump shaft, hydraulic part, it is characterized in that the hydraulic part skin is equipped with two-layer housing, suction port and discharge opening are arranged on the frame, inner housing is adorned the assembly that forms a whole by pump rotor, stator, stage casing, suction body collection, wherein, pump rotor is made up of pump shaft, first stage impeller, impeller, balance body, axle sleeve and locking member; First stage impeller passes pump shaft, pack into successively then stator, stage casing, impeller, and pump shaft passes the balance body at the impeller place, and the two ends of the first and last level impeller suction body of packing into passes through bolt between inner housing and the frame.