CN115898884A

CN115898884A - Radial subdivision double-stage two-end support centrifugal pump

Info

Publication number: CN115898884A
Application number: CN202211401033.8A
Authority: CN
Inventors: 王云平; 丁垣利; 任卫东; 徐少芬
Original assignee: Sunshine Pump Tianjin Co ltd
Current assignee: Sunshine Pump Tianjin Co ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-04-04

Abstract

The invention discloses a radially split two-stage two-end support centrifugal pump which comprises a pump body, a pump cover, a primary impeller, a secondary impeller, a bearing box body, a pump shaft horizontally penetrating through the bearing box body and a bearing arranged in the bearing box body and used for supporting the pump shaft; the pump body is connected with the bearing box body through a pump cover, one side of the pump cover, which is close to the bearing box body, is provided with a mechanical seal, and the pump shaft is a rigid shaft and adopts a conical shaft to extend; the primary impeller adopts a double-suction structure, and the primary impeller and the secondary impeller are sleeved on the pump shaft and arranged in a back-to-back manner; a throat bush on the pump body is arranged on a shaft sleeve on the pump shaft and used for throttling and decompressing; the bearing comprises a combination of a deep ball bearing and an angular contact bearing, a combination of a sliding bearing and a ball bearing or a combination of a sliding bearing and a thrust pad bearing; the balance pipe enables the two sides of the pump body to keep a pressure close to the suction pressure in a sealing way; the invention has the advantages of simple structure, reasonable design, stable operation under the requirement of low cavitation, low temperature rise of the bearing, long service life of the extended bearing, long maintenance interval period and convenient disassembly.

Description

Radial subdivision two-stage two-end supporting centrifugal pump

Technical Field

The invention belongs to the technical field of centrifugal pumps, and particularly relates to a radial subdivision double-stage two-end supporting centrifugal pump.

Background

The radial subdivision double-stage two-end supporting centrifugal pump is an important position in a customer use site, long-time shutdown is not allowed, the pump is required to operate stably and reliably, later-stage maintenance is convenient, and a plurality of domestic enterprises produce the pumps with more problems, unstable operation, short bearing service life, inconvenient maintenance and the like.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a radial subdivision two-stage two-end support centrifugal pump which is simple in structure, reasonable in design, low in bearing temperature rise and long in service life, long in maintenance interval period and convenient to disassemble and has operation stability under the requirement of low cavitation.

In order to achieve the purpose, the invention provides a radial subdivision two-stage two-end support centrifugal pump which comprises a pump body, a pump cover, a first-stage impeller, a second-stage impeller, a bearing box body, a pump shaft horizontally penetrating through the bearing box body and a bearing arranged in the bearing box body and used for supporting the pump shaft; the pump body is connected with the bearing box body through a pump cover, one side of the pump cover, which is close to the bearing box body, is provided with a mechanical seal, and the pump shaft is a rigid shaft and adopts a conical shaft extension; the primary impeller adopts a double-suction structure, and the primary impeller and the secondary impeller are sleeved on the pump shaft and arranged in a back-to-back manner; a throat bush on the pump body is arranged on a shaft sleeve on the pump shaft and used for throttling and decompressing; the bearing comprises a combination of a deep ball bearing and an angular contact bearing, a combination of a sliding bearing and a ball bearing or a combination of a sliding bearing and a thrust pad bearing; bearing glands are arranged on two sides of the bearing box body, and the bearing isolator is used for sealing the bearing box body with lubricating oil; the balance tube keeps the two sides of the pump body sealed and keeps the pressure close to the suction pressure.

Preferably, a replaceable pump body mouth ring is arranged on the pump body;

preferably, the primary impeller and the secondary impeller are both provided with replaceable impeller opening rings;

preferably, the first-stage impeller is axially fixed on the pump shaft through a half-dividing sleeve and a half-dividing fixed sleeve;

preferably, said secondary impeller is axially fixed to the pump shaft by means of a fixed sleeve.

The invention provides a radial subdivision two-stage two-end support centrifugal pump which has the following beneficial effects:

according to the invention, through the connection mode of the pump body, the pump cover, the primary impeller, the secondary impeller, the bearing box body, the pump shaft and the bearing, the pump body is designed in a heavy type, and can simultaneously meet complex working conditions of high temperature, low temperature and the like. The primary impeller adopts a double-suction structure design, and a lower cavitation allowance is obtained. The pump shaft adopts the design of rigid shaft, extension mechanical seal life-span, and less eccentric is in order to reduce wearing and tearing, reliable rotor balance nature, and the vibration of pump is littleer, simultaneously, adopts the toper shaft to stretch, is convenient for seal maintenance. The bearing adopts three configuration modes of a deep ball bearing-angular contact bearing, a sliding bearing-ball bearing and a sliding bearing-thrust pad bearing, so that the pump body has longer service life. The balance pipe keeps the pressure close to the suction pressure at the two sides of the seal, and the service life of the mechanical seal is prolonged. The first-stage impeller is axially and separately fixed on the pump shaft by a half-dividing sleeve and a half-dividing fixing sleeve, and the second-stage impeller fixing sleeve is axially and separately fixed on the pump shaft. The shaft sleeve is installed on the pump shaft and plays the role of intercepting and reducing pressure with the throat bush installed on the pump body. Bearing glands are arranged on two sides of the bearing box, and the bearing isolator plays a role in sealing lubricating oil. The operation stability under the low cavitation requirement is realized, the temperature rise of the bearing is low, the service life of the bearing is prolonged, the maintenance interval period is long, and the disassembly is convenient.

Drawings

Fig. 1 is a schematic structural view of a radially split two-stage two-end supported centrifugal pump provided by the invention.

Fig. 2 is a schematic perspective view of a radially split two-stage two-end support centrifugal pump provided by the present invention.

In the figure:

1. the pump body 2, the first-stage impeller 3, the semi-fixed sleeve 4, the semi-sleeve 5, the pump shaft 6, the shaft sleeve 7, the throat bushing 8, the pump body opening ring 9, the impeller opening ring 10, the secondary impeller 11, the fixed sleeve 12, the pump cover 13, the mechanical seal 14, the bearing box body 15, the bearing 16, the bearing gland 17, the bearing isolator 18 and the balance pipe.

Detailed Description

The present invention will be further described with reference to specific examples and figures to assist in understanding the invention.

As shown in fig. 1-2, the two-stage two-end support centrifugal pump with a radially split structure provided by the present invention includes a pump body 1, a pump cover 12, a first-stage impeller 2, a second-stage impeller 10, a bearing housing 14 connected to the pump cover 12, a pump shaft 5 horizontally penetrating the bearing housing 14, and a bearing 15 installed in the bearing housing 14 and supporting the pump shaft 5; the pump body 1 is connected with the bearing box body 14 through the pump cover 12, the mechanical seal 13 is arranged on one side of the pump cover 12 close to the bearing box body 14, the pump body 1 is designed in a heavy mode and can meet complex working conditions of high temperature, low temperature and the like, and the pump body 1 is provided with the replaceable pump body opening ring 8. The first-stage impeller 2 adopts a double-suction structure, and lower cavitation allowance is obtained. The primary impeller 2 and the secondary impeller 10 are sleeved on the pump shaft 5 and are arranged in a back-to-back mode, the primary impeller 2 is axially fixed on the pump shaft 5 through the half-dividing sleeve 3 and the half-dividing fixing sleeve 4, and the secondary impeller 10 is axially fixed on the pump shaft 5 through the fixing sleeve 11. The primary impeller 2 and the secondary impeller 10 are both provided with replaceable impeller opening rings 9. The pump shaft 5 is a rigid shaft and adopts a conical shaft extension, so that the sealing maintenance is convenient, the service life of the mechanical seal 13 is prolonged, the eccentricity is smaller to reduce the abrasion, the rotor balance is reliable, and the vibration of the pump body 1 is smaller. The bearings 15 comprise a combination of deep ball bearings and angular contact bearings, a combination of sliding bearings and ball bearings or a combination of sliding bearings and thrust pad bearings, which provides the pump body 1 with a longer service life. A throat bush 7 on the pump body 1 is sleeved on a shaft sleeve 6 on the pump shaft 5 and used for throttling and pressure reducing. Bearing glands 16 are arranged on two sides of the bearing box body 14, and bearing isolators 17 are used for sealing lubricating oil for the bearing box body 14. The balance tube 18 keeps the pressure close to the suction pressure on the two sides of the pump body 1 in a sealing way, and the service life of the mechanical seal 13 is prolonged.

The inventive concept is explained in detail herein using specific examples, which are given only to aid in understanding the core concepts of the invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are included in the scope of the present invention.

Claims

1. A radial subdivision two-stage two-end support centrifugal pump is characterized by comprising a pump body, a pump cover, a primary impeller, a secondary impeller, a bearing box body, a pump shaft horizontally penetrating through the bearing box body and a bearing arranged in the bearing box body and used for supporting the pump shaft; the pump body is connected with the bearing box body through a pump cover, one side of the pump cover, which is close to the bearing box body, is provided with a mechanical seal, and the pump shaft is a rigid shaft and adopts a conical shaft extension; the primary impeller adopts a double-suction structure, and the primary impeller and the secondary impeller are sleeved on the pump shaft and arranged in a back-to-back manner; a throat bush on the pump body is arranged on a shaft sleeve on the pump shaft and used for throttling and decompressing; the bearing comprises a combination of a deep ball bearing and an angular contact bearing, a combination of a sliding bearing and a ball bearing or a combination of a sliding bearing and a thrust pad bearing; bearing glands are arranged on two sides of the bearing box body, and the bearing isolator is used for playing a role of sealing lubricating oil for the bearing box body; the balance tube keeps the two sides of the pump body sealed and keeps the pressure close to the suction pressure.

2. The radially split two-stage two-end support centrifugal pump of claim 1, wherein the pump body has a replaceable pump body orifice ring mounted thereon.

3. The radially split two-stage two-end support centrifugal pump of claim 1, wherein the primary and secondary impellers are provided with replaceable impeller collars.

4. The radially split two-stage two-end support centrifugal pump according to claim 3, wherein the first-stage impeller is axially fixed to the pump shaft by a split half sleeve and a split half fixed sleeve.

5. The radially split two-stage two-end support centrifugal pump according to claim 3, wherein the secondary impeller is axially fixed to the pump shaft by a fixing sleeve.