CN103671007A

CN103671007A - Displacement centrifugal pump

Info

Publication number: CN103671007A
Application number: CN201310640973.7A
Authority: CN
Inventors: 舒锦; 程飞
Original assignee: HUANGSHAN INDUSTRIAL PUM MANUFACTURE Co Ltd
Current assignee: HUANGSHAN INDUSTRIAL PUM MANUFACTURE Co Ltd
Priority date: 2013-12-04
Filing date: 2013-12-04
Publication date: 2014-03-26

Abstract

The invention relates to a displacement centrifugal pump comprising a pump body, a drive screw and a driven screw. The drive screw and the driven screw are fitted inside the pump body. The input segment of the drive screw extends out of the pump body. The input segment, extending out, of the drive screw is polished. The input segment is provided with an impeller through keys. The impeller is provided with an impeller enclosure. One axial end of the impeller enclosure is connected with one axial end of the pump body. The other axial end of the pump body is provided with an input cavity. One radial side of the impeller enclosure is provided with an outlet cavity. An outer end opening of the outlet cavity is provided with an outlet flange. The other axial end of the impeller enclosure is connected with a large end cover through a flange-shaped positioning projecting edge. The input end of the drive screw extends out of the large end cover. According to the basic principles of the screw pump and centrifugal pump, different features of the screw pump and centrifugal pump are integrated, and the displacement centrifugal pump is designed; the displacement centrifugal pump has high self-priming capacity and high lift (280m), and is capable of allowing flow not to change with lift changes and ensuring stable flow.

Description

A kind of volume centrifugal pump

Technical field

The invention belongs to pump technical field, be specifically related to a kind of constant flow, lift is high, and physical dimension is little, is applicable to the transfer pump of the medium transport of range of viscosities large (1-2000cSt).

Technical background

Centrifugal pump is widely used in low viscosity medium transport.Existing centrifugal pump is deposited problem in the following areas: 1. can not realize completely self-absorption function, need to guarantee could realize lower self-absorption function after inlet tube is filled with medium by additional device or labyrinth, suction head be low, poor reliability.2. instability of flow, changes with the variation of lift; Lift is also lower, is generally less than 120m.3. be not suitable for transfer of highly viscous medium, when dielectric viscosity is greater than 20cSt, the flow of centrifugal pump, lift, efficiency all will significantly reduce conventionally, be unfavorable for saving energy and reduce the cost.4. operating mode inapplicable and low-flow high-lift is used.Existing screw pump is compared with centrifugal pump, and in the situation of equal flow, the axial length of screw pump is longer than centrifugal pump, and volume is greater than centrifugal pump; And pressure is higher, its axial length is longer; Carry low viscosity medium efficiency low.

Summary of the invention

For realize stability of flow, lift high, there is strong suction capacity, the medium transport that is applicable to range of viscosities large (1-2000cSt) that efficiency is high, the invention provides a kind of volume centrifugal pump.

Concrete technical solution is as follows:

Volume centrifugal pump comprises the pump housing, active screw rod and a driven screw rod, and initiatively screw rod and the cooperation of driven screw rod are positioned at the pump housing; Initiatively the input section of screw rod extends outside the pump housing; Improvement is: initiatively the overhanging input section of screw rod is polished rod, and input section is upper is provided with impeller by key, and described impeller is provided with impeller chimney, and axial one end of described impeller chimney and axial one end of the pump housing are connected, and the axial the other end of the pump housing is input cavity; A radially side of impeller chimney offers outlet plenum, and the external port of outlet plenum is outlet(discharge) flange; The axial the other end of impeller chimney is connecting large end cap by the locating flange of flange-like; Initiatively the input end of screw rod extends outside large end cap.

The outer middle side part of large end cap is end cap sleeve pipe, and the outer end cooperation of described end cap sleeve pipe is provided with small end cover, and the input section of the active screw rod in end cap sleeve pipe is provided with bearing; In the input section of the active screw rod between described bearing and small end cover, coordinate and be provided with locking nut and mechanical sealing assembly, initiatively the input end of screw rod extends outside small end cover.

Between the end cap sleeve pipe of the input cavity of the described pump housing and large end cap, by balance tube, be communicated with.

Useful technique effect of the present invention embodies in the following areas:

1. the present invention, according to the basic principle of screw pump and centrifugal pump, integrates both different qualities, and with screw pump, in the work of leading portion suction side, screw rod end sucks, and centrifugal pump is at back segment (output terminal in screw rod), and impeller end is exported.Make this pump there is very strong self-priming performance, and lift high (lift size is directly proportional to outlet load, limited by power of motor and pump intensity, and design load is 280m), flow does not change with lift, keeps stable;

2. the screw rod of suction side can be that three screw rods are paid, and can be also that two screw rods is paid and the make paper moulds special molded line rotor of formula of five screw rods;

3. driving shaft structure, leading portion suction side is the spiral section part of screw rod initiatively, and back segment is as impeller stationary axle part, and impeller is arranged on initiatively on screw rod, makes the number of spare parts of pump few, and Transmitted chains shortens;

4. the pump housing is the Combination Design of inlet passage, Connectino flange for pipeline and screw rod wrap, and its cross section is irregularly-shaped hole;

Impeller chimney and the pump housing locating flange by flange-like align after by Bolt Connection, accuracy of alignment is high, compact structure;

6. according to the difference of working condition requirement, bearing can be arranged on the nearly side medium of mechanical seal, also can be arranged on the atmospheric side of mechanical seal, to adapt to the medium transport of different lubricities.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Fig. 2 is the A-A face sectional view of Fig. 1.

Fig. 3 is the partial sectional view of left view in Fig. 1.

Fig. 4 is the scheme of installation of active screw rod and impeller.

Sequence number in upper figure: active screw rod 1, small end cover 2, mechanical sealing assembly 3, locking nut 4, bearing 5, large end cap 6, impeller chimney 7, impeller 8, the pump housing 9, driven screw rod 10, balance tube 11, flat key 12.

Embodiment

Below in conjunction with accompanying drawing, by embodiment, the present invention is further described.

Embodiment 1

Referring to Fig. 1 and Fig. 2, a kind of volume centrifugal pump comprises the pump housing 9, active screw rod 1 and two driven screw rods 10, and initiatively

screw rod

1 and 10 cooperations of driven screw rod are positioned at the pump housing 9.Initiatively the input section of screw rod 1 extends outside the pump housing 9, and initiatively the overhanging input section of screw rod 1 is polished rod, and input section is upper installs impeller 8 by flat key 12, sees Fig. 4.Impeller 8 is provided with impeller chimney 7, and axial one end of impeller chimney 7 and axial one end of the pump housing 9 are bolted, and the axial the other end of the pump housing 9 is input cavity.A radially side of impeller chimney 7 offers outlet plenum, and the external port of outlet plenum is outlet(discharge) flange, sees Fig. 3; The axial the other end of impeller chimney 7 is connecting large end cap 6 by the locating flange of flange-like.The outer middle side part of large end cap 6 is end cap sleeve pipe, and the outer end cooperation of end cap sleeve pipe is provided with small end cover 2, in the input section of the active screw rod 1 in end cap sleeve pipe, bearing 5 is installed; In the input section of the active screw rod 1 between bearing 5 and small end cover 2, coordinate locking nut 4 and mechanical sealing assembly 3 are installed, initiatively the input end of screw rod 1 extends the outside of small end cover 2.Between the end cap sleeve pipe of the input cavity of the pump housing 9 and large end cap 6, by balance tube 11, be communicated with, with the suffered axial force of balancing volume centrifugal pump, initiatively the axial force of a small amount of remnants on screw rod 1 is by bearing 5 balances.

When pump work, active screw rod 1 impeller 8, and promote 10 rotations of two driven screw rods, and between intermeshing spiral surface and the pump housing 9, form an airtight chamber that volume is constant on two driven screw rods 10, now be transferred after medium enters the pump housing 9 and evenly enter continuously impeller chimney 7 along screw axial, be pushed into the center of impeller 8, in the centrifugal motion that impeller 8 High Rotation Speeds produce, further obtain energy, the continuous outlet(discharge) flange from impeller chimney 7 of medium is discharged, thereby reach the function of fed sheet of a media.

Claims

1. a volume centrifugal pump, comprises the pump housing, active screw rod and driven screw rod, and initiatively screw rod and the cooperation of driven screw rod are positioned at the pump housing; Initiatively the input section of screw rod extends outside the pump housing, it is characterized in that: initiatively the overhanging input section of screw rod is polished rod, input section is upper is provided with impeller by key, and described impeller is provided with impeller chimney, axial one end of described impeller chimney and axial one end of the pump housing are connected, and the axial the other end of the pump housing is input cavity; A radially side of impeller chimney offers outlet plenum, and the external port of outlet plenum is outlet(discharge) flange; The axial the other end of impeller chimney is connecting large end cap by the locating flange of flange-like; Initiatively the input end of screw rod extends outside large end cap.

2. a kind of volume centrifugal pump according to claim 1, is characterized in that: the outer middle side part of large end cap is end cap sleeve pipe, and the outer end cooperation of described end cap sleeve pipe is provided with small end cover, and the input section of the active screw rod in end cap sleeve pipe is provided with bearing; In the input section of the active screw rod between described bearing and small end cover, coordinate and be provided with locking nut and mechanical sealing assembly, initiatively the input end of screw rod extends outside small end cover.

3. a kind of volume centrifugal pump according to claim 1 and 2, is characterized in that: between the input cavity of the described pump housing and the end cap sleeve pipe of large end cap, by balance tube, be communicated with.