CN2122249U

CN2122249U - Balance multi-stage centrifugal pump

Info

Publication number: CN2122249U
Application number: CN 92209853
Authority: CN
Inventors: 王云奎
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-05-11
Filing date: 1992-05-11
Publication date: 1992-11-18

Abstract

The utility model provides a balanced multi-stage centrifugal pump which relates to a pump for conveying liquid, particularly to a multi-stage centrifugal pump which is suitable for conveying water containing sand and mud. The pump is characterized in that two groups of impellers having opposite directions and identical dimensions and quantity are symmetrically arranged on a pump shaft, and the corresponding stages of the two groups of impellers are communicated by a middle connecting pipe. The first-stage impeller in one group is communicated with a water inlet of the pump, and the last-stage impeller in the other group is communicated with a water outlet of the pump. The structure of the pump can effectively balance axial force, eliminate the abrasion phenomenon of the impellers because the axial force is unbalanced, reduce the volume of the pump and enhances the lift head.

Description

Balance multi-stage centrifugal pump

The utility model belongs to a kind of equipment for liquid transportation, particularly is suitable for multistage from pump in the work of silt particle operating mode.

Present mine both domestic and external is discharged underground water and is used conventional multistage centrifugal pump more in digging, this pump is used for general liquid to be carried, and be good its working life, can reach more than 4 years.But use under a large amount of silt particle situations in containing of mine, the life-span is then quite short.Its reason is the gap that silt particle easily enters the Balance disc place, makes balance sysmte be disturbed or destroy, and finally causes impeller accelerated wear test.In actual use, impeller just was worn in 3～15 days, and according to preliminary understanding, national mining multistage pump is annual wants nearly 30,000,000 yuan of loss.

The purpose of this utility model provides a kind of mining multistage centrifugal pump, and it is useful under the operating mode that contains a large amount of silt particles and uses, and long service life, simple and compact structure, and lift is higher.

The technical solution of the utility model is, symmetry is installed two prescriptions on the contrary on pump shaft, the impeller that amount of size is identical, wherein the chopped-off head of one group of impeller with pump into the mouth of a river and communicate, the impeller of another group communicates with pumping the mouth of a river, and the corresponding stage impeller of two groups of impellers is communicated with by middle adapter.The liquid that is sucked advances the chopped-off head of one group of impeller from pumping into the mouth of a river, through pressurized behind the impeller step by step, through middle adapter, enters another group impeller, and pressurization is step by step once more flowed out from pumping the mouth of a river.Owing to two groups of impeller installation directions are opposite, measure-alike, so the axial force of pump shaft is cancelled out each other, axle nothing string is moving then also just to have reduced the chance that the silt particle engaging friction is paid in the liquid, thereby makes the pump life-span raising of using under the silt particle operating mode containing.

Below, embodiment's accompanying drawing according in the utility model is further described its detailed structure.

Fig. 1 is a structural representation of the present utility model.

Each label is represented successively among the figure: axle 1, nut 2, bearing 3, bearing support 4, suction casing 5, valve 6, impeller 7, stator 8, stage casing 9, sealed member 10, packing seal parts 11, Spit Section 12, stator 13, impeller 14, stage casing 15, protective shaft sleeve 16, stator cover 17, seal ring 18, axle sleeve 19, axle sleeve 20, bearing interstage sleeve 21, bearing cap 22, Gland 23, water sealing (sealing water) pipe 24, O RunddichtringO 25,26, middle adapter 27, middle axle sleeve 28.

Pump described in the utility model is two prescriptions to be housed to the impeller 7 and 14 opposite, that size is identical with quantity on pump shaft 1, the chopped-off head of one group of impeller 7 with pump into the mouth of a river and communicate, its impeller 7 then is communicated with by middle adapter 27 first run with another group impeller 14, at last impeller 14 with pump the mouth of a river and communicate.One group of impeller 7 on the axle 1 is to guide the liquid of carrying into axle 1 middle part with the installation direction of organizing impeller 14 separately, O RunddichtringO 25,26 is all adopted in the sealing at sealing between the sections in the pump and middle adapter 27 two ends, make the overall structure of pump simple and compact, sealing is reliable, and the assembly accumulation error that guarantees pump controlled, and assembly quality is increased.Each impeller 7 in this pump or 14 are equipped with an independently protective shaft sleeve 16, and it is made by high-abrasive material, can keep the precision and the efficient of pump more longways, also for carrying the liquid that contains silt particle to create condition.

The structures that impeller are divided into two groups of reverse installations that this pump is taked can be saved requisite balance sysmte in the conventional multistage centrifugal pump, and this system causes silt particle to block the reason that causes impeller accelerated wear test often; Adopt the sealing of O RunddichtringO between the sections, loading and unloading are very convenient, and sealing is reliable, can eliminate the conventional big shortcoming of paper washer assembly accumulation error; Adopt middle adapter to be communicated with two groups of impellers, make runner the shortest and liquid flowing resistance is little, can make the pump compact overall structure effectively, improve transfer efficiency.

Claims

1, a kind of multistage centrifugal pump, it is characterized in that symmetry is equipped with two groups of impellers 7,14 that direction is opposite, size is identical with quantity on the axle 1 of pump, the chopped-off head of one group of impeller 7 with pump into the mouth of a river and communicate, the final stage of another group impeller 14 communicates with pumping the mouth of a river, and the corresponding stage impeller of two groups of impellers is communicated with by middle adapter 27.

2, by the described multistage centrifugal pump of claim 1, it is characterized in that two groups of impellers 7,14 all aspirated liquid is caused the direction installation at axle 1 middle part, the sealing between the sections in the pump and middle adapter 27 two ends is O RunddichtringO 25,26.

3, by claim 1 and 2 described multistage centrifugal pumps, it is characterized in that 7,14 in each blade all is equipped with the protective shaft sleeve 16 that high-abrasive material is made.