CN112360753A

CN112360753A - Double-suction submersible centrifugal pump

Info

Publication number: CN112360753A
Application number: CN202011406076.6A
Authority: CN
Inventors: 孙宏伟; 胡晓飞; 陆保文; 陈建; 严青松; 葛松涛; 陆新星
Original assignee: ANHUI ZHENGYUAN MACHINERY CO LTD
Current assignee: ANHUI ZHENGYUAN MACHINERY CO LTD
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-02-12

Abstract

The invention relates to a double-suction submersible centrifugal pump which comprises a motor shell, wherein an upper end cover is arranged above the motor shell, a wire connecting cover is arranged on the upper end cover, a lifting bar is arranged on the outer side of the wire connecting cover, a lower end cover is arranged below the motor shell, a volute is arranged below the lower end cover, a bell mouth is arranged at the bottom of the volute, a water outlet is arranged on the left side of the volute, a water inlet is formed above the water outlet of the volute, an oil chamber is arranged between the lower end cover and the volute in a sealing manner, a shaft is arranged in the motor shell, bearings are arranged in a bearing chamber of the upper end cover and a bearing chamber of the lower end cover of the motor shell, the upper end of the shaft is fixed in the bearing, the lower end of the shaft penetrates through the oil chamber to enter the volute, and a first framework. The submersible pump thoroughly solves the problems that the single-suction submersible sewage pump has large axial tension and is easy to leak water when a mechanical seal is used in a higher-lift occasion, and the like.

Description

Double-suction submersible centrifugal pump

Technical Field

The invention relates to the field of water conservancy, in particular to a double-suction submersible centrifugal pump.

Background

The axial tension of the conventional single-suction submersible sewage pump is large, and the problem that mechanical sealing is easy to leak water when the pump is used in a high-lift occasion exists.

Disclosure of Invention

The invention provides a double-suction submersible centrifugal pump, which aims to overcome the defects that the axial tension of a single-suction submersible sewage pump in the prior art is large, and the mechanical seal is easy to leak water when used in a high-lift occasion.

In order to solve the technical problems, the invention provides the following technical scheme: a double-suction submersible centrifugal pump comprises a motor shell, wherein an upper end cover is installed above the motor shell, a wiring cover is installed on the upper end cover, a lifting bar is installed on the outer side of the wiring cover, a lower end cover is installed below the motor shell, a volute is installed below the lower end cover, a bell mouth is installed at the bottom of the volute, a water outlet is formed in the left side of the volute, a water inlet is formed in the position, above the water outlet, of the volute, an oil chamber is installed between the lower end cover and the volute in a sealing mode, a shaft is arranged in the motor shell, bearings are installed in the upper end cover of the motor shell and a bearing chamber of the lower end cover, the upper end of the shaft is fixed in the bearings, the lower end of the shaft penetrates through the oil chamber to enter the volute, a first framework seal, a first mechanical seal, a second framework seal and a second mechanical seal are installed on the shaft from top to bottom, the first framework seal is, the first mechanical seal is arranged at the top of the oil chamber, the second framework is arranged at the bottom of the oil chamber in a sealing manner, the second mechanical seal is arranged at the top of the volute, an impeller is arranged at a water outlet in the volute, and the lower end of the shaft is in key connection with the impeller.

Furthermore, the number of the bearings at the top of the motor shell is one, and the number of the bearings at the bottom of the motor shell is three.

Further, the lower portion of the body of the shaft is reduced in radius.

Further, a wear ring is arranged at the position where the impeller is contacted with the bell mouth.

Compared with the prior art, the invention has the beneficial effects that: the utility model provides a double suction formula submersible centrifugal pump, this immersible pump has thoroughly solved single suction formula submersible sewage pump's axial tension big, uses the shortcoming scheduling problem that mechanical seal easily leaks in higher lift occasion.

Drawings

FIG. 1 is a schematic structural view of a double-suction submersible centrifugal vertical profile pump according to the present invention;

FIG. 2 is a schematic diagram of a slant section structure of a double-suction submersible centrifugal pump according to the present invention;

FIG. 3 is an enlarged schematic view of A in FIG. 2 of a double-suction submersible centrifugal pump according to the present invention;

fig. 4 is an enlarged structural schematic diagram of B in fig. 2 of the double-suction submersible centrifugal pump of the present invention.

The reference numbers in the figures are: 1-a motor casing; 2-upper end cover; 3-a wiring cover; 4-lifting; 5-lower end cap; 6-volute; 7-a horn mouth; 8-water outlet; 9-a water inlet; 10-oil chamber; 11-axis; 12-a first skeletal seal; 13-first mechanical seal; 14-a second skeleton seal; 15-a second mechanical seal; 16-an impeller; wear ring 17.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 4, it can be known that: the utility model provides a double suction type submersible centrifugal pump, includes motor casing 1, upper end cover 2 is installed to the top of motor casing 1, install wiring lid 3 on the upper end cover 2, the outside installation lifting flap 4 of wiring lid 3, lower end cover 5 is installed to the below of motor casing 1, spiral case 6 is installed to the below of lower end cover 5, the bottom installation horn mouth 7 of spiral case 6, the left side of spiral case 6 sets up delivery port 8, spiral case 6 is located the top of delivery port 8 and sets up water inlet 9, seal installation grease chamber 10 between lower end cover 5 and the spiral case 6, set up axle 11 in the motor casing 1, the bearing chamber installation bearing of upper end cover 2 and lower end cover 5 of motor casing 1, the upper end of axle 11 is fixed in the bearing, the lower extreme of axle 11 passes grease chamber 10 and gets into in the spiral case 6, from the top down on the axle 11 first skeleton seal 12 of installation, first mechanical seal 13, The first framework seal 12 is mounted at the bottom of the lower end cover 5, the first mechanical seal 13 is mounted at the top of the oil chamber 10, the second framework seal 14 is mounted at the bottom of the oil chamber 10, the second mechanical seal 15 is mounted at the top of the volute 6, an impeller 16 is mounted at the water outlet 8 in the volute 6, and the lower end of the shaft 11 is in key connection with the impeller 16.

The top of the motor casing 1 is provided with one bearing, and the bottom of the motor casing is provided with three bearings.

The lower part of the body of the shaft 11 is reduced in radius.

The impeller 16 is provided with a wear ring 17 at the contact position with the bell mouth 7.

The principle and the advantages of the invention are as follows: in the process of connecting a power supply to work, along with the rotation of the impeller 16, the impeller 16 can suck liquid from the other upper and lower directions simultaneously, namely, the liquid outside the submersible pump can enter the volute 6 through the water inlet 9 simultaneously and is discharged through the water outlet 8 at one side of the water outlet channel under the pressurization of the impeller 16, as the liquid moves from the water inlet 9 to the impeller 16 in the volute 6, the liquid sucked from the water inlet 9 in the operation process of the impeller 16 in the submersible pump can generate a downward axial force on the impeller 16 under the action of the impeller 16, and the liquid from the water inlet 9 can generate an upward axial force on the impeller 16 under the action of the impeller 16, and as the impeller 16 is symmetrical in structure, the two generated axial forces are equal in magnitude and opposite in direction, namely, the axial forces are automatically balanced, so that the phenomenon that the axial force acts on a central axis is not generated, the phenomenon that the bearing is influenced by axial force is avoided, and the service life of the bearing can be ensured when the submersible pump pumps liquid with large flow and high lift, so that the lift of the submersible pump with the same power can be increased by 5-10 meters under the condition of large flow with the same requirement, and the requirement of pumping liquid with large flow and high lift can be met.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a double suction type submersible centrifugal pump, includes motor casing (1), its characterized in that: an upper end cover (2) is installed above the motor casing (1), a wiring cover (3) is installed on the upper end cover (2), a lifting piece (4) is installed on the outer side of the wiring cover (3), a lower end cover (5) is installed below the motor casing (1), a volute (6) is installed below the lower end cover (5), a bell mouth (7) is installed at the bottom of the volute (6), a water outlet (8) is formed in the left side of the volute (6), a water inlet (9) is formed above the water outlet (8) of the volute (6), an oil chamber (10) is hermetically installed between the lower end cover (5) and the volute (6), a shaft (11) is arranged in the motor casing (1), bearings are installed in bearing chambers of the upper end cover (2) and the lower end cover (5) of the motor casing (1), the upper end of the shaft (11) is fixed in the bearings, and the lower end of the shaft (11) penetrates through the oil chamber (10) to enter the volute (6), the shaft (11) is provided with a first framework seal (12), a first mechanical seal (13), a second framework seal (14) and a second mechanical seal (15) from top to bottom, the first framework seal (12) is arranged at the bottom of the lower end cover (5), the first mechanical seal (13) is arranged at the top of the oil chamber (10), the second framework seal (14) is arranged at the bottom of the oil chamber (10), the second mechanical seal (15) is arranged at the top of the volute (6), an impeller (16) is arranged at a water outlet (8) in the volute (6), and the lower end of the shaft (11) is in key connection with the impeller (16).

2. A double suction submersible centrifugal pump according to claim 1, characterized in that the motor housing (1) has one top bearing and three bottom bearings.

3. A double suction submersible centrifugal pump according to claim 1, characterized in that the lower part of the body of the shaft (11) is reduced in radius.

4. A double suction submersible centrifugal pump according to claim 1, characterized in that the impeller (16) is fitted with a wear ring (17) where it contacts the bell (7).